阅读说明：本技术 电池管理系统 (Battery management system ) 是由 浦武林 张志国 冯建功 林威臣 于 2021-09-29 设计创作，主要内容包括：本申请提供一种电池管理系统,包括具有第一可控开关以及限流电阻的限流电路、具有第二可控开关的主电路以及电池管理系统控制单元,其中,限流电路与主电路并联连接,并共同串联接入电池组与负载之间,电池管理系统控制单元与第一可控开关和第二可控开关连接,用于控制其导通或断开,当电池管理系统处于休眠模式时,控制第一可控开关导通,并控制第二可控开关断开,以使电池组基于限流电路为负载供电。本申请的电池管理系统,增设了与主电路并联的具有限流电阻的限流电路,从而可以在电池管理系统处于休眠模式时,基于限流电路为负载供电,从而有效减少了休眠模式下的电流消耗,进而降低了用户为电池包补电的频率,提升了用户体验。(The application provides a battery management system, including the current-limiting circuit who has first controllable switch and current-limiting resistor, the main circuit that has second controllable switch and battery management system control unit, wherein, current-limiting circuit and main circuit parallel connection, and connect in between group battery and load jointly in series, battery management system control unit is connected with first controllable switch and second controllable switch, be used for controlling its switch-on or disconnection, when battery management system is in the dormancy mode, control first controllable switch and switch-on, and control the disconnection of second controllable switch, so that the group battery is based on current-limiting circuit for the load power supply. The battery management system is additionally provided with the current limiting circuit which is connected with the main circuit in parallel and is provided with the current limiting resistor, so that power can be supplied to a load based on the current limiting circuit when the battery management system is in a sleep mode, current consumption under the sleep mode is effectively reduced, the frequency of power supplement for a battery pack by a user is reduced, and user experience is improved.)

1. A battery management system, comprising: the battery management system comprises a current limiting circuit, a main circuit and a battery management system control unit; the current limiting circuit is connected with the main circuit in parallel; the current limiting circuit comprises a first controllable switch and a current limiting resistor; the main circuit comprises a second controllable switch;

the first end of the first controllable switch is connected with the first end of the second controllable switch and the anode of the battery pack, the second end of the first controllable switch is connected with the first end of the current-limiting resistor, the second end of the current-limiting resistor is connected with the second end of the second controllable switch and the input end of the load, and the output end of the load is connected with the cathode of the battery pack;

the control end of the first controllable switch and the control end of the second controllable switch are connected with the battery management system control unit and used for being switched on or switched off under the control of the battery management system control unit;

when the battery management system is in a sleep mode, the battery management system control unit controls the first controllable switch to be switched on and controls the second controllable switch to be switched off, so that the battery pack supplies power to the load based on the current limiting circuit;

when the battery management system is in a normal working mode, the battery management system control unit controls the first controllable switch and the second controllable switch to be conducted, so that the battery pack supplies power to the load based on the current limiting circuit and the main circuit.

2. The battery management system of claim 1, wherein the current limit circuit further comprises: sampling a resistor;

the first end of the sampling resistor is connected with the second end of the first controllable switch, and the second end of the sampling resistor is connected with the first end of the current-limiting resistor;

when the first controllable switch is turned on, the sampling resistor is used for sampling the current passing through the current limiting circuit.

3. The battery management system of claim 1, further comprising: a first controllable switch drive unit;

the first controllable switch driving unit is connected with the control end of the first controllable switch and the battery management system control unit;

the first controllable switch driving unit is used for controlling the first controllable switch to be switched on or switched off under the control of the battery management system control unit.

4. The battery management system of claim 2, further comprising: a second controllable switch drive unit;

the second controllable switch driving unit is connected with the control end of the second controllable switch and the battery management system control unit;

the second controllable switch driving unit is used for controlling the second controllable switch to be switched on or switched off under the control of the battery management system control unit.

5. The battery management system of claim 4, further comprising: a current detection unit;

the current detection unit is connected with the sampling resistor and the battery management system control unit;

when the battery management system is in a sleep mode, the current detection unit is used for detecting the current collected by the sampling resistor and outputting a first current signal to the battery management system control unit based on a detection result, wherein the first current signal is used for indicating the battery management system control unit to switch the battery management system from the sleep mode to a normal working mode.

6. The battery management system of claim 5, further comprising: a current trigger unit;

the current trigger unit is connected with the current detection unit, the second controllable switch driving unit and the battery management system control unit;

the current trigger unit is configured to receive a first current signal output by the current detection unit, and output a second current signal to the second controllable switch driving unit based on the received first current signal under the control of the battery management system control unit, where the second current signal is used to instruct the second controllable switch driving unit to control the second controllable switch to be turned on.

7. The battery management system of claim 1, further comprising: a communication unit;

the communication unit is connected with the battery management system control unit and a charger, the input end of the charger is connected with the second end of the current-limiting resistor and the second end of the second controllable switch, and the output end of the charger is connected with the negative electrode of the battery pack;

the communication unit is used for sending a charging request to the charger under the control of the battery management system control unit, so that the charger charges the battery pack based on the charging request and based on the current limiting circuit when the battery management system is in a sleep mode, and charges the battery pack based on the current limiting circuit and the main circuit when the battery management system is in a normal working mode.

8. The battery management system of claim 7, wherein the second controllable switch comprises: a discharge switch and a charge switch;

when the battery management system is in a sleep mode, the battery management system control unit controls the first controllable switch to be switched on and controls the discharge switch and the charge switch of the second controllable switch to be switched off, so that the battery pack supplies power to the load based on the current limiting circuit, or the charger charges the battery pack based on the current limiting circuit;

when the battery management system is in a normal working mode, the battery management system control unit controls the first controllable switch to be conducted, controls the discharge switch of the second controllable switch to be conducted, and controls the charge switch to be disconnected, or controls the charge switch to be conducted and the discharge switch to be disconnected, so that the battery pack supplies power to the load based on the current limiting circuit and the main circuit, or the charger charges the battery pack based on the current limiting circuit and the main circuit.

9. The battery management system of claim 1, further comprising: a battery information acquisition unit;

the battery information acquisition unit is connected with the battery pack and the battery management system control unit;

the battery information acquisition unit is used for acquiring the information of the battery pack when the battery management system is in a normal working mode and sending the acquired information of the battery pack to the battery management system control unit; the battery management system control unit is used for judging whether the battery pack has a fault according to the received information of the battery pack, and controlling the first controllable switch and the second controllable switch to be switched off if the battery pack has the fault.

10. The battery management system according to claim 9, wherein the battery information collection unit includes: a current collection module;

one end of the current acquisition module is connected with the negative electrode of the battery pack, and the other end of the current acquisition module is connected with the load and the output end of the charger and used for acquiring current information of the battery pack.

Technical Field

The application relates to the technical field of power batteries, in particular to a battery management system.

Background

With the development of the automobile industry, new energy automobiles are more and more widely applied in daily life. Most new energy vehicles adopt a lithium ion battery pack as a starting battery, the lithium ion battery pack is composed of a battery pack and a battery management system, and the battery pack is managed by the battery management system to supply power to a vehicle-mounted load.

But enters sleep mode when the battery management system is not enabled for a continuous period of time. However, at this time, the vehicle-mounted load still needs to be continuously powered, so that a main circuit for supplying power to the vehicle-mounted load can be additionally arranged between the battery pack and the vehicle-mounted load, the main circuit is provided with a controllable switch controlled by a control unit of the battery management system, and when the battery management system enters a sleep mode, the voltage can be continuously output only by keeping the controllable switch on, so as to supply power to the vehicle-mounted load.

However, when the battery management system supplies power to the vehicle-mounted load in the sleep mode, a large current needs to be consumed, so that the capacity of the lithium ion battery pack is reduced rapidly, and a user needs to frequently supplement power for the lithium ion battery pack, which affects user experience.

Disclosure of Invention

The application provides a battery management system for reducing current consumption when a vehicle-mounted load is powered in a sleep mode.

In a first aspect, the present application provides a battery management system, comprising: the battery management system comprises a current limiting circuit, a main circuit and a battery management system control unit; the current limiting circuit is connected with the main circuit in parallel; the current limiting circuit comprises a first controllable switch and a current limiting resistor; the main circuit comprises a second controllable switch;

the first end of the first controllable switch is connected with the first end of the second controllable switch and the anode of the battery pack, the second end of the first controllable switch is connected with the first end of the current-limiting resistor, the second end of the current-limiting resistor is connected with the second end of the second controllable switch and the input end of the load, and the output end of the load is connected with the cathode of the battery pack;

the control end of the first controllable switch and the control end of the second controllable switch are connected with the battery management system control unit and used for being switched on or switched off under the control of the battery management system control unit;

when the battery management system is in a sleep mode, the battery management system control unit controls the first controllable switch to be switched on and controls the second controllable switch to be switched off, so that the battery pack supplies power to the load based on the current limiting circuit;

when the battery management system is in a normal working mode, the battery management system control unit controls the first controllable switch and the second controllable switch to be conducted, so that the battery pack supplies power to the load based on the current limiting circuit and the main circuit.

Further, in the battery management system as described above, the current limiting circuit further includes: sampling a resistor;

the first end of the sampling resistor is connected with the second end of the first controllable switch, and the second end of the sampling resistor is connected with the first end of the current-limiting resistor;

when the first controllable switch is turned on, the sampling resistor is used for sampling the current passing through the current limiting circuit.

Further, the battery management system as described above, further comprising: a first controllable switch drive unit;

the first controllable switch driving unit is connected with the control end of the first controllable switch and the battery management system control unit;

the first controllable switch driving unit is used for controlling the first controllable switch to be switched on or switched off under the control of the battery management system control unit.

Further, the battery management system as described above, further comprising: a second controllable switch drive unit;

the second controllable switch driving unit is connected with the control end of the second controllable switch and the battery management system control unit;

the second controllable switch driving unit is used for controlling the second controllable switch to be switched on or switched off under the control of the battery management system control unit.

Further, the battery management system as described above, further comprising: a current detection unit;

the current detection unit is connected with the sampling resistor and the battery management system control unit;

when the battery management system is in a sleep mode, the current detection unit is used for detecting the current collected by the sampling resistor and outputting a first current signal to the battery management system control unit based on a detection result, wherein the first current signal is used for indicating the battery management system control unit to switch the battery management system from the sleep mode to a normal working mode.

Further, the battery management system as described above, further comprising: a current trigger unit;

the current trigger unit is connected with the current detection unit, the second controllable switch driving unit and the battery management system control unit;

the current trigger unit is configured to receive a first current signal output by the current detection unit, and output a second current signal to the second controllable switch driving unit based on the received first current signal under the control of the battery management system control unit, where the second current signal is used to instruct the second controllable switch driving unit to control the second controllable switch to be turned on.

Further, the battery management system as described above, further comprising: a communication unit;

the communication unit is connected with the battery management system control unit and a charger, the input end of the charger is connected with the second end of the current-limiting resistor and the second end of the second controllable switch, and the output end of the charger is connected with the negative electrode of the battery pack;

the communication unit is used for sending a charging request to the charger under the control of the battery management system control unit, so that the charger charges the battery pack based on the charging request and based on the current limiting circuit when the battery management system is in a sleep mode, and charges the battery pack based on the current limiting circuit and the main circuit when the battery management system is in a normal working mode.

Further, as in the battery management system described above, the second controllable switch comprises: a discharge switch and a charge switch;

when the battery management system is in a sleep mode, the battery management system control unit controls the first controllable switch to be switched on and controls the discharge switch and the charge switch of the second controllable switch to be switched off, so that the battery pack supplies power to the load based on the current limiting circuit, or the charger charges the battery pack based on the current limiting circuit;

when the battery management system is in a normal working mode, the battery management system control unit controls the first controllable switch to be conducted, controls the discharge switch of the second controllable switch to be conducted, and controls the charge switch to be disconnected, or controls the charge switch to be conducted and the discharge switch to be disconnected, so that the battery pack supplies power to the load based on the current limiting circuit and the main circuit, or the charger charges the battery pack based on the current limiting circuit and the main circuit.

Further, the battery management system as described above, further comprising: a battery information acquisition unit;

the battery information acquisition unit is connected with the battery pack and the battery management system control unit;

the battery information acquisition unit is used for acquiring the information of the battery pack when the battery management system is in a normal working mode and sending the acquired information of the battery pack to the battery management system control unit; the battery management system control unit is used for judging whether the battery pack has a fault according to the received information of the battery pack, and controlling the first controllable switch and the second controllable switch to be switched off if the battery pack has the fault.

Further, in the battery management system as described above, the battery information collecting unit includes: a current collection module;

one end of the current acquisition module is connected with the negative electrode of the battery pack, and the other end of the current acquisition module is connected with the load and the output end of the charger and used for acquiring current information of the battery pack.

The application provides a battery management system, which comprises a current limiting circuit with a first controllable switch and a current limiting resistor, a main circuit with a second controllable switch and a battery management system control unit, wherein the current limiting circuit is connected with the main circuit in parallel and is connected between a battery pack and a load in series, the battery management system control unit is connected with the first controllable switch and the second controllable switch and is used for controlling the connection or disconnection of the first controllable switch and the second controllable switch, when the battery management system is in a sleep mode, the first controllable switch is controlled to be connected, the second controllable switch is controlled to be disconnected, so that the battery pack supplies power to the load based on the current limiting circuit, and when the battery management system is in a normal working mode, the first controllable switch and the second controllable switch are controlled to be connected, so that the battery pack supplies power to the load based on the current limiting circuit and the main circuit. That is to say, the battery management system that this application provided has add the current-limiting circuit that has the current-limiting resistance with the main circuit parallelly connected to can be when the battery management system is in the sleep mode, for the load power supply based on the current-limiting circuit, thereby effectively reduced the current consumption under the sleep mode, and then reduced the frequency that the user mends the electricity for the battery package, promoted user experience.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

Fig. 1 is a schematic structural diagram of a battery management system according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a battery management system according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a battery management system according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of a battery management system according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of a battery management system according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a battery management system according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a battery management system according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a battery management system according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of a battery management system according to an embodiment of the present application;

fig. 10 is a schematic structural diagram of a battery management system according to an embodiment of the present application;

fig. 11 is a schematic structural diagram of a battery management system according to an embodiment of the present application.

With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of battery management systems consistent with aspects of the present application.

The lithium ion battery pack of the new energy automobile comprises a battery pack and a battery management system, and the battery pack is managed by the battery management system to supply power to the vehicle-mounted load. But enters sleep mode when the battery management system is not enabled for a continuous period of time. However, at this time, the vehicle-mounted load still needs to be powered continuously, so that in order to ensure that the battery pack can still keep the voltage output continuously when the battery management system enters the sleep mode, and supply power to the vehicle-mounted load, a main circuit for supplying power to the vehicle-mounted load can be additionally arranged between the battery pack and the vehicle-mounted load, and a controllable switch is arranged on the main circuit. When the battery management system does not enter the sleep mode, namely the normal working mode, the battery management system can acquire information of the battery pack and control the controllable switch to be switched on or off through the battery management system control unit, so that the management of the battery pack is realized. When the battery management system enters the sleep mode, the battery management system control unit controls the controllable switch to be switched on, so that the voltage can be kept continuously output to supply power for the vehicle-mounted load.

However, when the battery management system supplies power to the vehicle-mounted load in the sleep mode, a large current needs to be consumed, so that the capacity of the lithium ion battery pack is reduced rapidly, and a user needs to frequently supplement power for the lithium ion battery pack, which affects user experience.

The present application provides a battery management system, which aims to solve the above technical problems in the prior art.

The following describes the technical solutions of the present application and how to solve the above technical problems with specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present application will be described below with reference to the accompanying drawings.

Example one

Fig. 1 is a schematic structural diagram of a battery management system according to an embodiment of the present application, and as shown in fig. 1, the battery management system according to the embodiment includes: a current limiting circuit 1, a main circuit 2, and a battery management system control unit 3. The current limiting circuit 1 is connected in parallel with the main circuit 2. The current limiting circuit 1 includes a first controllable switch 11 and a current limiting resistor 12. The main circuit 2 comprises a second controllable switch 21.

In this embodiment, the first end of the first controllable switch 11 is connected to the first end of the second controllable switch 21 and the anode of the battery pack, the second end of the first controllable switch 11 is connected to the first end of the current limiting resistor 12, the second end of the current limiting resistor 12 is connected to the second end of the second controllable switch 21 and the input end of the load, and the output end of the load is connected to the cathode of the battery pack. The control terminal of the first controllable switch 11 and the control terminal of the second controllable switch 21 are connected to the battery management system control unit 3, and are configured to be turned on or off under the control of the battery management system control unit 3.

The first controllable switch 11 and the second controllable switch 21 may be Metal-Oxide-Semiconductor Field-Effect transistors (MOSFETs) or other suitable switching elements, which is not limited in this embodiment.

In addition, the battery pack may be a battery pack that is consistent with the load voltage, for example, a 12V battery pack that is formed by connecting 4 lithium batteries in series, or another suitable battery pack, which is not limited in this embodiment.

In practical applications, when the battery management system is in the sleep mode, the battery management system control unit 3 controls the first controllable switch 11 to be turned on and controls the second controllable switch 21 to be turned off, so that the battery pack supplies power to the load based on the current limiting circuit 1. Specifically, the current flows from the positive electrode (BAT +) of the battery pack, flows into the load through the current limiting circuit 1, and then flows back to the negative electrode (BAT-) of the battery pack.

When the battery management system is in the normal operation mode, the battery management system control unit 3 controls the first controllable switch 11 and the second controllable switch 21 to be turned on, so that the battery pack supplies power to the load based on the current limiting circuit 1 and the main circuit 2. Specifically, the current flows from the positive electrode (BAT +) of the battery pack, flows into the load through the current limiting circuit 1 and the main circuit 2, and then flows back to the negative electrode (BAT-) of the battery pack.

Fig. 2 is a schematic structural diagram of a battery management system according to an embodiment of the present application, and as shown in fig. 2, on the basis of the first embodiment, the current limiting circuit 1 of the battery management system according to the embodiment further includes: the resistor 13 is sampled.

In this embodiment, a first end of the sampling resistor 13 is connected to a second end of the first controllable switch 11, and a second end of the sampling resistor 13 is connected to a first end of the current limiting resistor 12.

In practical applications, when the first controllable switch 11 is turned on, the sampling resistor 13 may sample the current passing through the current limiting circuit 1 for subsequent processing.

In an optional implementation manner, fig. 3 is a schematic structural diagram of a battery management system provided in an embodiment of the present application, and as shown in fig. 3, on the basis of the first embodiment, the battery management system provided in this embodiment further includes: a first controllable switch drive unit 4.

In the present embodiment, the first controllable switch driving unit 4 is connected to the control terminal of the first controllable switch 11 and the battery management system control unit 3.

In practical applications, the first controllable switch driving unit 4 may control the first controllable switch 11 to be turned on or off under the control of the battery management system control unit 3. Since the current of the current limiting circuit 1 is small, the power consumption is low, so that the first controllable switch 11 can be kept on under the condition that the battery pack has no fault no matter the battery management system is in the sleep mode or the normal operation mode. In an example, the first controllable switch driving unit 4 may be a driving and holding circuit with low power consumption, and the driving and holding circuit may control the first controllable switch 11 to keep the on state only by the battery management system control unit 3 sending a high-level control signal to the driving and holding circuit, so that the battery management system control unit 3 is not required to continuously output current, and power consumption is effectively reduced. When the battery pack has a fault, the battery management system control unit 3 sends a low-level control signal to the drive holding circuit, and the drive holding circuit can control the first controllable switch 11 to be switched off, so that the circuit protection is realized.

In an optional implementation manner, fig. 4 is a schematic structural diagram of a battery management system provided in an embodiment of the present application, and as shown in fig. 4, on the basis of the first embodiment, the battery management system provided in this embodiment further includes: a second controllable switch drive unit 5.

The second controllable switch drive unit 5 is connected to the control terminal of the second controllable switch 21 and the battery management system control unit 3.

In practical applications, the second controllable switch driving unit 5 is used to control the second controllable switch 21 to be turned on or off under the control of the battery management system control unit 3. In an example, the second controllable switch driving unit 5 may be a low power consumption driving circuit, when the battery management system is in the normal operation mode, the driving circuit may control the second controllable switch 21 to be turned on only by the battery management system control unit 3 sending a high-level control signal to the driving circuit, and the battery pack may supply power to the load based on the main circuit 2, so that the battery management system control unit 3 is not required to continuously output current, and power consumption is effectively reduced. When the battery pack has a fault, the battery management system control unit 3 sends a low-level control signal to the driving circuit, and the driving circuit can control the second controllable switch 21 to be switched off, so that the circuit protection is realized.

The battery management system provided by the embodiment comprises a current limiting circuit with a first controllable switch and a current limiting resistor, a main circuit with a second controllable switch and a battery management system control unit, wherein the current limiting circuit is connected with the main circuit in parallel and is commonly connected between a battery pack and a load in series, the battery management system control unit is connected with the first controllable switch and the second controllable switch and is used for controlling the connection or disconnection of the first controllable switch and the second controllable switch, when the battery management system is in a sleep mode, the first controllable switch is controlled to be connected, the second controllable switch is controlled to be disconnected, so that the battery pack supplies power to the load based on the current limiting circuit, and when the battery management system is in a normal working mode, the first controllable switch and the second controllable switch are controlled to be connected, so that the battery pack supplies power to the load based on the current limiting circuit and the main circuit. That is to say, in the embodiment of the application, the current limiting circuit with the current limiting resistor is additionally arranged, and the current limiting circuit is connected with the main circuit in parallel, so that power can be supplied to the load based on the current limiting circuit when the battery management system is in the sleep mode, current consumption in the sleep mode is effectively reduced, the frequency of power supplement for the battery pack by a user is reduced, and user experience is improved.

Example two

Fig. 5 is a schematic structural diagram of a battery management system according to an embodiment of the present application, and as shown in fig. 5, on the basis of the first embodiment, the battery management system according to the present embodiment further includes: a current detection unit 6.

In the present embodiment, the current detection unit 6 is connected to the sampling resistor 13 and the battery management system control unit 3.

In practical applications, when the battery management system is in the sleep mode, the current detection unit 6 may detect the current collected by the sampling resistor 13, and output a first current signal to the battery management system control unit 3 based on the detection result, where the first current signal is used to instruct the battery management system control unit 3 to switch the battery management system from the sleep mode to the normal operation mode.

In an example, the current detection unit 6 may be a low-power-consumption current detection circuit, when the battery management system is in a sleep mode, if the current detection circuit detects that the current collected by the sampling resistor 13 is greater than a preset current threshold, the first current signal CUR _ DET may be output to the battery management system control unit 3, and when the battery management system control unit 3 receives the first current signal CUR _ DET, the battery management system may be switched from the sleep mode to a normal operation mode, so that the second controllable switch 21 may be controlled to be turned on, the battery pack may supply power to the load based on the current limiting circuit 1 and the main circuit 2, thereby avoiding that the load is supplied power based on the current limiting circuit 1, and the load cannot operate due to insufficient power supply, and further avoiding that the current limiting circuit 1 is continuously overloaded and the current limiting resistor 12 is overheated and damaged.

Fig. 6 is a schematic structural diagram of a battery management system according to an embodiment of the present application, and as shown in fig. 6, on the basis of the second embodiment, the battery management system according to the present embodiment further includes: a current trigger unit 7.

In the present embodiment, the current triggering unit 7 is connected to the current detection unit 6, the second controllable switch drive unit 5, and the battery management system control unit 3.

In practical applications, the current trigger unit 7 is configured to receive the first current signal output by the current detection unit 6, and output a second current signal to the second controllable switch driving unit 5 based on the received first current signal under the control of the battery management system control unit 3, where the second current signal is used to instruct the second controllable switch driving unit 5 to control the second controllable switch 21 to be turned on.

In the above example, the current detection unit 6 outputs the first current signal CUR _ DET to the battery management system control unit 3, and also outputs the first current signal CUR _ DET to the current trigger unit 7, after the current trigger unit 7 receives the first current signal, the second controllable switch drive unit 5 can output the second current signal CUR _ TR under the control of the battery management system control unit 3, and after the second controllable switch drive unit 5 receives the second current signal CUR _ TR, the second controllable switch 21 can be controlled to be turned on, and the battery pack can supply power to the load based on the current limiting circuit 1 and the main circuit 2, so that it is not necessary that the battery management system is switched from the sleep mode to the normal operation mode, and then the battery management system control unit 3 controls the second controllable switch 21 to be turned on, thereby effectively improving the response speed of the system.

In the battery management system provided by this embodiment, the current detection unit may detect the current collected by the sampling resistor and output a first current signal, so that the battery management system control unit switches the battery management system from the sleep mode to the normal operating mode according to the first current signal, and the current trigger unit may output a second current signal based on the first current signal, so as to rapidly control the conduction of the second controllable switch, so that the battery pack may supply power to the load based on the current limiting circuit and the main circuit, thereby effectively avoiding the power supply to the load based on the current limiting circuit, and the load may not operate due to insufficient power supply, and avoiding the damage due to overheating of the current limiting resistor caused by continuous overload of the current limiting circuit.

EXAMPLE III

Fig. 7 is a schematic structural diagram of a battery management system according to an embodiment of the present application, and as shown in fig. 7, on the basis of the first embodiment, the battery management system according to the present embodiment further includes: a communication unit 8.

In this embodiment, the communication unit 8 is connected to the battery management system control unit 3 and the charger, an input end of the charger is connected to the second end of the current limiting resistor 11 and the second end of the second controllable switch 21, and an output end of the charger is connected to a negative electrode of the battery pack.

In practical applications, the communication unit 8 may send a charging request to the charger under the control of the battery management system control unit 3, so that the charger charges the battery pack based on the current limiting circuit 1 when the battery management system is in the sleep mode and charges the battery pack based on the current limiting circuit 1 and the main circuit 2 when the battery management system is in the normal operation mode based on the charging request.

In an example, after the communication unit 8 sends a charging request to the charger under the control of the battery management system control unit 3, if the battery management system is in the sleep mode, that is, the first controllable switch 11 is turned on, and the second controllable switch 21 is turned off, the charger may charge the battery pack based on the current limiting circuit 1. During charging, current flows out of the positive electrode of the charger, flows into the positive electrode (BAT +) of the battery pack through the current limiting circuit 1, and then flows back to the negative electrode of the charger from the negative electrode (BAT-) of the battery pack. If the battery management system is in a normal operating mode, that is, the first controllable switch 11 is turned on, and the second controllable switch 21 is also turned on, the charger may charge the battery pack based on the current limiting circuit 1 and the main circuit 2. During charging, current flows out of the positive electrode of the charger, flows into the positive electrode (BAT +) of the battery pack through the current limiting circuit 1 and the main circuit 2, and then flows back to the negative electrode of the charger from the negative electrode (BAT-) of the battery pack.

Fig. 8 is a schematic structural diagram of a battery management system according to an embodiment of the present application, and as shown in fig. 8, on the basis of the third embodiment, in the battery management system according to the present embodiment, the second controllable switch 21 includes: a discharge switch 211 and a charge switch 212.

In this embodiment, when the battery management system is in the sleep mode, the battery management system control unit 3 may control the first controllable switch 11 to be turned on, and control the discharging switch 211 and the charging switch 212 of the second controllable switch 21 to be turned off, so that the battery pack supplies power to the load based on the current limiting circuit 1, or the charger charges the battery pack based on the current limiting circuit 1.

When the battery management system is in the normal operation mode, the battery management system control unit 3 may control the first controllable switch 11 to be turned on, and control the discharging switch 211 of the second controllable switch 21 to be turned on, and the charging switch 212 to be turned off, or the charging switch 212 to be turned on and the discharging switch 211 to be turned off, so that the battery pack supplies power to the load based on the current limiting circuit 1 and the main circuit 2, or the charger charges the battery pack based on the current limiting circuit 1 and the main circuit 2.

In practical applications, if the battery management system is in the sleep mode, when the charger does not receive the charging request sent by the communication unit 8, the battery management system control unit 3 may control the first controllable switch 11 to be turned on, and control the discharging switch 211 and the charging switch 212 of the second controllable switch 21 to be turned off, so that the battery pack may supply power to the load based on the current limiting circuit 1, and when the charger receives the charging request sent by the communication unit 8, the battery management system control unit 3 may control the first controllable switch 11 to be turned on, and control the discharging switch 211 and the charging switch 212 of the second controllable switch 21 to be turned off, so that the charger may charge the battery pack based on the current limiting circuit 1.

If the battery management system is in the normal operation mode, when the charger does not receive the charging request sent by the communication unit 8, the battery management system control unit 3 may control the first controllable switch 11 to be turned on, and control the discharging switch 211 of the second controllable switch 21 to be turned on, and the charging switch 212 to be turned off, so that the battery pack may supply power to the load based on the current limiting circuit 1 and the main circuit 2, and when the charger receives the charging request sent by the communication unit 8, the battery management system control unit 3 may control the first controllable switch 11 to be turned on, and control the charging switch 212 of the second controllable switch 21 to be turned on, and the discharging switch 211 to be turned off, so that the charger may charge the battery pack based on the current limiting circuit 1 and the main circuit 2.

The battery management system provided by the embodiment performs charge and discharge control through the charge switch and the discharge switch, and ensures smooth switching of charge and discharge of the battery pack.

Example four

Fig. 9 is a schematic structural diagram of a battery management system according to an embodiment of the present application, and as shown in fig. 9, on the basis of the first embodiment, the battery management system according to the present embodiment further includes: and a battery information acquisition unit 9.

In the present embodiment, the battery information collection unit 9 is connected to the battery pack and the battery management system control unit 3.

In practical application, the battery information collecting unit 9 may collect information of the battery pack when the battery management system is in a normal operation mode, and send the collected information of the battery pack to the battery management system control unit 3. The battery management system control unit 3 is configured to determine whether the battery pack has a fault according to the received information of the battery pack, and if the battery pack has a fault, control the first controllable switch 11 and the second controllable switch 21 to be turned off, thereby implementing circuit protection.

Fig. 10 is a schematic structural diagram of a battery management system according to an embodiment of the present application, and as shown in fig. 10, on the basis of the fourth embodiment, a battery information collecting unit 9 of the battery management system according to the present embodiment includes: and a current collection module 91.

In this embodiment, one end of the current collection module 91 is connected to the negative electrode of the battery pack, and the other end is connected to the load and the output end of the charger, so as to collect current information of the battery pack, so that the battery management system control unit 3 determines whether the battery pack has a fault according to the current information of the battery pack collected by the current collection module 91, and if the battery pack has a fault, the first controllable switch 11 and the second controllable switch 21 are controlled to be turned off, thereby implementing circuit protection.

The battery management system provided by this embodiment collects the state information of the battery pack through the battery information collection unit and sends the state information to the battery management system control unit, so that the first controllable switch and the second controllable switch can be controlled to be turned off in time when the battery pack breaks down, and circuit protection is realized.

EXAMPLE five

Fig. 11 is a schematic structural diagram of a battery management system according to an embodiment of the present application, and as shown in fig. 11, when the first embodiment to the fourth embodiment are implemented in combination, the battery management system according to the present embodiment includes: the battery management system comprises a current limiting circuit 1, a main circuit 2 connected with the current limiting circuit 1 in parallel, a battery management system control unit 3, a first controllable switch driving unit 4, a second controllable switch driving unit 5, a current detection unit 6, a current trigger unit 7, a communication unit 8 and a battery information acquisition unit 9. The current limiting circuit 1 includes a first controllable switch 11, a current limiting resistor 12 and a sampling resistor 13, the main circuit 2 includes a second controllable switch 21, the second controllable switch 21 includes a discharging switch 211 and a charging switch 212, and the battery information collecting unit 9 includes a current collecting module 91.

In this embodiment, a first end of the first controllable switch 11 is connected to a first end of the second controllable switch 21 and is commonly connected to an anode of the battery pack, a second end of the first controllable switch 11 is connected to a first end of the sampling resistor 13, a second end of the sampling resistor 13 is connected to a first end of the current limiting resistor 12, a second end of the current limiting resistor 12 is connected to a second end of the second controllable switch 21 and is commonly connected to an input terminal of the load and the charger through a positive terminal, an output terminal of the load and the charger is connected to one end of the current collecting module 91 of the battery information collecting unit 9 through a negative terminal, and the other end of the current collecting module 91 is connected to a cathode of the battery pack.

The first controllable switch driving unit 4 is connected with a control end of the first controllable switch 11 and the battery management system control unit 3, the second controllable switch driving unit 5 is connected with a control end of the second controllable switch 21 and the battery management system control unit 3, the current detecting unit 6 is connected with the sampling resistor 13 and the battery management system control unit 3, the current triggering unit 7 is connected with the current detecting unit 6, the second controllable switch driving unit 5 and the battery management system control unit 3, the communication unit 8 is connected with the battery management system control unit 3 and a charger, and the battery information collecting unit 9 is connected with the battery pack and the battery management system control unit 3.

The first controllable switch 11 is a knife switch, and the second controllable switch 21 is a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET). The first controllable switch driving unit 4 is a low-power-consumption driving holding circuit, the second controllable switch driving unit 5 is a low-power-consumption driving circuit, the current detecting unit 6 is a low-power-consumption current detecting circuit, and the current triggering unit 7 is a low-power-consumption current triggering circuit.

In addition, the load is a 12V vehicle-mounted load, the charger is a 12V vehicle-mounted charger, and the battery pack is a 12V battery pack formed by connecting 4 lithium batteries in series.

In practical applications, if the battery management system is in the sleep mode, when the charger does not receive the charging request sent by the communication unit 8, the battery management system control unit 3 may control the first controllable switch 11 to be turned on, and control the discharging switch 211 and the charging switch 212 of the second controllable switch 21 to be turned off, so that the battery pack may supply power to the load based on the current limiting circuit 1, and when the charger receives the charging request sent by the communication unit 8, the battery management system control unit 3 may control the first controllable switch 11 to be turned on, and control the discharging switch 211 and the charging switch 212 of the second controllable switch 21 to be turned off, so that the charger may charge the battery pack based on the current limiting circuit 1.

When the power supply is carried out for the load, the current flows out from the anode (BAT +) of the battery pack, flows into the load through the current limiting circuit 1 and the 12V + wiring terminal, and flows back to the cathode (BAT-) of the battery pack through the 12V-wiring terminal and the current collecting module 91.

When charging, the current flows out from the positive pole of the charger, flows into the positive pole (BAT +) of the battery pack through the current limiting circuit 1 and the 12V + wiring terminal, and then flows back to the negative pole of the charger from the negative pole (BAT-) of the battery pack through the 12V-wiring terminal and the current collecting module 91.

If the battery management system is in the normal operation mode, when the charger does not receive the charging request sent by the communication unit 8, the battery management system control unit 3 may control the first controllable switch 11 to be turned on, and control the discharging switch 211 of the second controllable switch 21 to be turned on, and the charging switch 212 to be turned off, so that the battery pack may supply power to the load based on the current limiting circuit 1 and the main circuit 2, and when the charger receives the charging request sent by the communication unit 8, the battery management system control unit 3 may control the first controllable switch 11 to be turned on, and control the charging switch 212 of the second controllable switch 21 to be turned on, and the discharging switch 211 to be turned off, so that the charger may charge the battery pack based on the current limiting circuit 1 and the main circuit 2.

When the power supply is carried out for the load, the current flows out from the anode (BAT +) of the battery pack, respectively flows into the load through the current limiting circuit 1 and the main circuit 2 via the 12V + wiring terminal, and then flows back to the cathode (BAT-) of the battery pack through the 12V-wiring terminal and the current collecting module 91.

When charging, the current flows out from the positive pole of the charger, respectively flows into the positive pole (BAT +) of the battery pack through the current limiting circuit 1 and the main circuit 2 via the 12V + wiring terminal, and then flows back to the negative pole of the charger from the negative pole (BAT-) of the battery pack through the 12V-wiring terminal and the current collecting module 91.

In addition, when the battery management system is in a sleep mode, that is, when the first controllable switch 11 is turned on, the sampling resistor 13 may sample the current passing through the current limiting circuit 1, the current detecting unit 6 may detect the current collected by the sampling resistor 13, if the current detecting circuit detects that the current collected by the sampling resistor 13 is greater than a preset current threshold, the first current signal CUR _ DET may be output to the battery management system control unit 3 and the current triggering unit 7, when the battery management system control unit 3 receives the first current signal CUR _ DET, the battery management system may be switched from the sleep mode to a normal operation mode, and after the current triggering unit 7 receives the first current signal CUR _ DET, the second current signal CUR _ TR may be output to the second controllable switch driving unit 5 under the control of the battery management system control unit 3, after receiving the second current signal CUR _ TR, the second controllable switch driving unit 5 may control the second controllable switch 21 to be turned on, and the battery pack may supply power to the load based on the current limiting circuit 1 and the main circuit 2, so as to avoid that the load cannot work due to insufficient power supply caused by the power supply of the current limiting circuit 1, and in addition, the current limiting circuit 1 may be continuously overloaded to cause the current limiting resistor 12 to be overheated and damaged.

When the battery management system is in a normal working mode, the battery information acquisition unit 9 can acquire information of the battery pack, and the battery information acquisition unit 9 includes a total voltage acquisition module, a cell temperature acquisition module and a cell equalization module besides the current acquisition module 91, so that information of the battery pack, such as cell voltage, temperature and current, can be acquired, and the acquired information of the battery pack is sent to the battery management system control unit 3. The battery management system control unit 3 may determine whether the battery pack has a fault according to the received information of the battery pack, and if the battery pack has a fault, control the first controllable switch 11 and the second controllable switch 21 to be turned off, thereby implementing circuit protection.

The battery management system that this embodiment provided has add the current-limiting circuit that has the current-limiting resistance that connects in parallel with the main circuit to can be when battery management system is in sleep mode, for the load power supply based on the current-limiting circuit, thereby effectively reduced the current consumption under the sleep mode, and then reduced the frequency that the user mends the electricity for the battery package, promoted user experience.

In the several embodiments provided in the present application, it should be understood that the disclosed battery management system may be implemented in other manners. For example, the above-described battery management system embodiments are merely illustrative, and for example, the division of modules is merely a logical division, and other divisions may be implemented in practice, for example, multiple modules or components may be combined or integrated into another system, or some features may be omitted, or not implemented. In addition, the shown or discussed coupling or direct coupling or communication connection between each other may be through some interfaces, and the battery management system or module may be indirectly coupled or communicated through some interfaces, and may be in an electrical, mechanical or other form.

Modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.

In addition, functional modules in the embodiments of the present application may be integrated into one processing module, or each of the modules may exist alone physically, or two or more modules are integrated into one module. The integrated module can be realized in a hardware form, and can also be realized in a form of hardware and a software functional module.

Further, while operations are depicted in a particular order, this should be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. Under certain circumstances, multitasking and parallel processing may be advantageous. Likewise, while several specific implementation details are included in the above discussion, these should not be construed as limitations on the scope of the application. Certain features that are described in the context of separate embodiments can also be implemented in combination in a single implementation. Conversely, various features that are described in the context of a single implementation can also be implemented in multiple implementations separately or in any suitable subcombination.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.