System and method for automatically connecting and disconnecting power battery

文档序号：180724 发布日期：2021-11-02 浏览：42次中文

阅读说明：本技术 一种自动接入断开动力电池的系统和方法 (System and method for automatically connecting and disconnecting power battery ) 是由刘燕刘朝吉张国辉刘聪瑞李成于 2021-07-30 设计创作，主要内容包括：本申请涉及一种自动接入断开动力电池的系统和方法,系统包括控制器、输出正极端、输出负极端、充电正极端、充电负极端和多个电池组；电池组的正极与输出正极端、充电正极端均通过一受控开关相连,负极与输出负极端、充电负极端均通过一受控开关相连,受控开关用以导通或隔断电池组；控制器被配置为：根据各个电池组的电压确定故障电池,并控制确定的故障电池组两端的受控开关打开,使得该故障电池组与输出正极端和输出负极端隔断；在故障电池组检修后,控制各个电池组两端的受控开关,使得各个电池组与充电正极端、充电负极端导通来进行充电。本申请能够保障动力电池系统在电池组出现故障时其他的电池组仍可独立工作,还能够满足不同的车辆需求。(The application relates to a system and a method for automatically switching in and switching off a power battery, wherein the system comprises a controller, an output positive terminal, an output negative terminal, a charging positive terminal, a charging negative terminal and a plurality of battery packs; the positive pole and the output positive pole end of the battery pack and the charging positive pole end of the battery pack are connected through a controlled switch, the negative pole and the output negative pole end and the charging negative pole end of the battery pack are connected through a controlled switch, and the controlled switch is used for conducting or cutting off the battery pack; the controller is configured to: determining a fault battery according to the voltage of each battery pack, and controlling the controlled switches at two ends of the determined fault battery pack to be opened so that the fault battery pack is isolated from the output positive terminal and the output negative terminal; and after the fault battery pack is overhauled, the controlled switches at the two ends of each battery pack are controlled, so that each battery pack is conducted with the charging positive terminal and the charging negative terminal to be charged. According to the power battery system, other battery packs can still work independently when the battery packs break down, and different vehicle requirements can be met.)

1. A system for automatically connecting and disconnecting a power battery is characterized by comprising a controller, an output positive terminal, an output negative terminal, a charging positive terminal, a charging negative terminal and a plurality of battery packs;

the positive pole and the output positive pole end of the battery pack and the charging positive pole end of the battery pack are connected through a controlled switch, the negative pole and the output negative pole end of the battery pack and the charging negative pole end of the battery pack are connected through a controlled switch, and the controlled switch is used for conducting or cutting off the battery pack;

the controller is configured to:

determining a fault battery according to the voltage of each battery pack, and controlling the controlled switches at two ends of the determined fault battery pack to be opened so that the fault battery pack is isolated from the output positive terminal and the output negative terminal;

and after the fault battery pack is overhauled, controlling the controlled switches at the two ends of each battery pack to ensure that each battery pack is conducted with the charging positive terminal and the charging negative terminal to charge.

2. The system for automatically connecting and disconnecting a power battery as claimed in claim 1, wherein the number of the battery packs is two, one is a first battery pack, and the other is a second battery pack, and the rated capacities of the first battery pack and the second battery pack are the same.

3. The system for automatically connecting and disconnecting a power battery as claimed in claim 2, wherein the controlled switches at both ends of the second battery pack are respectively connected with the output positive terminal and the output negative terminal through a transfer switch.

4. The system for automatically turning on and off a power battery according to claim 3, wherein the controlled switch and the transfer switch are independently controlled by the controller.

5. The system for automatically turning on and off a power battery according to claim 3, wherein the controlled switch or the transfer switch is a relay.

6. The system for automatically turning on and off a power battery according to claim 1, wherein the battery pack is formed by a plurality of battery boxes connected in series.

7. The system for automatically turning on and off a power battery as recited in claim 1, wherein the controller is further configured to:

before the battery packs are connected in parallel, the battery packs to be connected with the positive electrode output end and the negative electrode output end are determined according to the voltages of the battery packs, and the controlled switches at the two ends of the determined battery packs are controlled to be closed, so that the battery packs are connected with the output positive electrode end and the output negative electrode end.

8. A method for automatically connecting and disconnecting a power battery, which is based on the system for automatically connecting and disconnecting the power battery according to any one of claims 1-7, and is characterized by comprising the following steps:

9. The method for automatically turning on and off a power battery according to claim 8, further comprising the steps of:

10. The method for automatically turning on and off power batteries according to claim 8, wherein the specific step of determining the faulty battery according to the voltage of each battery pack comprises:

detecting the voltage of each battery pack, and calculating the difference value between the larger value and the smaller value of any two voltages;

and judging whether the difference value is above a set threshold value, if so, judging that the battery pack corresponding to the smaller value is a fault battery, and if not, judging that the battery pack is normal.

Technical Field

The application relates to the technical field of control over power batteries of new energy vehicles, in particular to a system and a method for automatically connecting and disconnecting a power battery.

Background

With the rapid development of economy, new energy automobiles have a more rapid development trend than fuel vehicles. The application of pure electric control technology is gradually prosperous in various types of vehicles, such as light transport vehicles, medium and heavy transport vehicles, special vehicles, and the like.

In practical vehicle applications, power battery systems have different requirements depending on their endurance, amount of power, etc. At present, a conventional design scheme is that a plurality of groups of batteries are connected in parallel, and when one group of batteries is abnormal and is not processed in time, the whole power battery system enters a fault state and cannot work normally.

Therefore, how to ensure that the power battery system can still work independently when the power battery system fails is needed to be solved.

Disclosure of Invention

The embodiment of the application provides a system and a method for automatically switching in and switching off power batteries, so as to solve the problem that a group of batteries in a power battery system in the related art fails to work normally, which results in the failure of the whole power battery system.

In a first aspect, a system for automatically switching on and off a power battery is provided, which comprises a controller, an output positive terminal, an output negative terminal, a charging positive terminal, a charging negative terminal and a plurality of battery packs;

the controller is configured to:

In some embodiments, the number of the battery packs is two, one is a first battery pack, and the other is a second battery pack, and the rated capacities of the first battery pack and the second battery pack are the same.

In some embodiments, the controlled switches at both ends of the second battery pack are respectively connected to the output positive terminal and the output negative terminal through a switch.

In some embodiments, the controlled switch and the switch are independently controlled by the controller.

In some embodiments, the controlled switch or the diverter switch is a relay.

In some embodiments, the battery pack is formed by connecting a plurality of battery cases in series.

In some embodiments, the controller is further configured to:

In a second aspect, a method for automatically connecting and disconnecting a power battery is also provided, and the method is based on the system for automatically connecting and disconnecting a power battery, and comprises the following steps:

In some embodiments, the method further comprises the steps of:

In some embodiments, the step of determining a faulty battery according to the voltage of each battery pack includes:

detecting the voltage of each battery pack, and calculating the difference value between the larger value and the smaller value of any two voltages;

The beneficial effect that technical scheme that this application provided brought includes: the power battery system can still work independently when a battery pack breaks down, and different vehicle requirements can be met.

The embodiment of the application provides a system and a method for automatically switching on and off a power battery, in the system, the system comprises a controller and a plurality of battery packs, two ends of each battery pack are respectively provided with a controlled switch, the controller switches on or off the corresponding battery pack by controlling the on and off of each controlled switch, and the controller is configured to: determining a fault battery according to the voltage of each battery pack, and controlling the controlled switches at two ends of the determined fault battery pack to be opened so that the fault battery pack is isolated from the output positive terminal and the output negative terminal; and after the fault battery pack is overhauled, controlling the controlled switches at the two ends of each battery pack to ensure that each battery pack is conducted with the charging positive terminal and the charging negative terminal to charge. Therefore, the embodiment of the application can monitor the fault battery in time and charge the battery after the fault battery is overhauled so that the overhauled battery pack is normally connected with other battery packs in parallel, the influence of the fault battery pack on other normal battery packs can be reduced, the normal work of other battery packs of the power battery is guaranteed, and meanwhile, the controlled switch can be turned off and selected according to actual vehicle requirements, so that different vehicle requirements are met.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a system for automatically connecting and disconnecting a power battery according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of another system for automatically connecting and disconnecting a power battery according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The flow diagrams depicted in the figures are merely illustrative and do not necessarily include all of the elements and operations/steps, nor do they necessarily have to be performed in the order depicted. For example, some operations/steps may be decomposed, combined or partially combined, so that the actual execution sequence may be changed according to the actual situation.

The embodiment of the application provides a system for automatically switching in and switching off a power battery, which can timely monitor a fault battery and charge the fault battery after the fault battery is overhauled, so that an overhauled battery pack is normally connected with other battery packs in parallel again, the influence of the fault battery pack on other normal battery packs can be reduced, and the normal work of other battery packs of the power battery is guaranteed.

Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

As shown in fig. 1, an embodiment of the present application provides a system for automatically connecting and disconnecting a power battery, including a controller, an output positive terminal, an output negative terminal, a charging positive terminal, a charging negative terminal, and a plurality of battery packs;

the controller is configured to:

In the embodiment of the application, all the battery packs form the power battery of the whole vehicle, the anode of each battery pack is connected with the output anode end through a controlled switch, the anode is connected with the charging anode end through another controlled switch, the cathode of each battery pack is connected with the output cathode end through a controlled switch, the cathode is connected with the charging cathode end through another controlled switch, each controlled switch is controlled by the controller, when the whole vehicle is in the driving process, the controller detects the voltage of each battery pack in real time and determines the fault battery, if a certain battery pack has a fault, namely, the battery pack is defined as the fault battery pack, the controller controls the controlled switches at the two ends of the fault battery pack to be disconnected, so that the fault battery pack is separated from the output anode end and the output cathode end, and the purpose of cutting off the fault battery pack is achieved, the rest battery packs can still be normally connected in parallel; and then, the faulty battery pack can be detected and maintained, and after the detection and maintenance are finished, consistency check is required before the battery pack after maintenance is connected with other battery packs in parallel, so that the controller controls the controlled switches at the two ends of each battery pack, and the battery packs are conducted with the charging positive terminal and the charging negative terminal to be fully charged, so that the capacities of the battery packs are the same, and the safety of the parallel connection use of the battery packs is ensured.

Meanwhile, the controlled switch can be switched off according to the actual vehicle requirements, so that different vehicle requirements can be met.

As shown in fig. 1, the number of the battery packs is two, one is a first battery pack, and the other is a second battery pack, and the rated capacities of the first battery pack and the second battery pack are the same. When the rated capacities of the battery packs are the same, the safety of the parallel connection of the battery packs can be ensured.

Further, the controlled switches at the two ends of the second battery pack are correspondingly connected with the output positive terminal and the output negative terminal through a change-over switch.

Further, the controlled switch and the change-over switch are independently controlled by the controller.

In particular, the controlled switch or the diverter switch is a relay. In the embodiment of the application, the relay is controlled by the controller, and remote switching is performed through the controller, so that the safety is further improved.

In the embodiment of the application, if the number of the battery packs meeting the requirement of a certain vehicle is less than the number of the battery packs on the actual whole vehicle, the controller controls the corresponding change-over switches to be turned on to cut off the battery packs with the proper number, so that the number of the battery packs connected in parallel meets the actual requirement of the vehicle.

Generally, the capacity of a single battery case is limited, so the battery pack is formed by connecting a plurality of battery cases in series. A plurality of battery boxes are connected in series, so that the overall capacity of the power battery can be improved, and the manufacturing cost is reduced.

As a preferable solution of the embodiment of the present application, the controller is further configured to:

In the embodiment of the application, after all the battery packs are fully charged, the parallel connection of the battery packs is performed after safety judgment is performed on the parallel battery packs, and the battery packs to be parallel connected are determined by detecting the voltage of each battery pack as same as the determination of the fault battery pack.

The embodiment of the application also provides a method for automatically connecting and disconnecting the power battery, which is based on the system for automatically connecting and disconnecting the power battery, and comprises the following steps:

As a preferable scheme of the embodiment of the present application, the method further includes the following steps:

Further, the specific step of determining a faulty battery according to the voltage of each battery pack includes:

detecting the voltage of each battery pack, and calculating the difference value between the larger value and the smaller value of any two voltages;

In this application embodiment, the controller includes vehicle control unit VCU and the battery management unit BMU the same with group battery quantity, every the group battery all links to each other with a battery management unit BMU, just positive output the circuit definition between the negative pole output is first circuit, the circuit definition between the positive terminal that charges, the negative pole end that charges is the second circuit, and battery management unit BMU still needs to carry out the adhesion of relay before carrying out the voltage detection of group battery and detects, when the relay is not adhered, can be allowed to carry out voltage detection.

As shown in fig. 1, in the embodiment of the present application, the battery pack includes a first battery pack and a second battery pack, the positive electrode of the first battery pack is connected to the positive output terminal through a relay K1+, and is also connected to the positive charge terminal through a relay K1+ ', the negative electrode is connected to the negative output terminal through a relay K1-, and the negative electrode is also connected to the negative charge terminal through a relay K1-'; the positive pole of the second battery pack is connected with the positive output terminal through a relay K2+, and is also connected with the positive charging terminal through a relay K2+ ', the negative pole is connected with the negative output terminal through a relay K2-, and the negative pole is also connected with the negative charging terminal through a relay K2-'.

The process before the first battery pack and the second battery pack are connected in parallel specifically includes:

the VCU sends closing instructions to all battery management units BMU and all controlled switches on the first line, after the BMU detects that adhesion detection is qualified and receives the closing instructions, the voltage U1 of the first battery pack and the voltage U2 of the second battery pack are detected, and the relation between the difference value of the voltage U1 and the voltage U2 and a set threshold value delta U is compared;

if U1-U2 is not less than delta U, determining that a battery pack to be connected with the positive electrode output end and the negative electrode output end is a first battery pack, and a second battery pack has a battery fault, sequentially controlling a relay K1-and a relay K1+ to be closed by a battery management unit BMU, simultaneously sending information of the battery fault of the second battery pack to a vehicle control unit VCU, limiting the power output of a vehicle control unit VCU, and when the branch current of the relay K2+ and the relay K2-is reduced to the relay safety cut-off current, controlling the relay K2+ and the relay K2-to be opened by the battery management unit BMU to cut off the branch, namely the second battery pack is cut off;

if the U1-U2 <. DELTA.U, determining that battery packs to be connected with the anode output end and the cathode output end are a first battery pack and a second battery pack, and controlling a relay K1-and a relay K2-to be closed in sequence and then controlling a relay K1+ and a relay K2+ to be closed in sequence by the BMU;

if U2-U1 > -delta U, determining that a battery pack to be connected with the positive output end and the negative output end is a second battery pack, and the first battery pack has a battery fault, sequentially controlling a relay K2-and a relay K2+ to be closed by the battery management unit BMU, simultaneously sending the information that the first battery pack has the battery fault to a vehicle control unit VCU, limiting the power output of the vehicle control unit VCU, and when the branch current where the relay K1+ and the relay K1-are located is reduced to the relay safety cut-off current, controlling the relay K1+ and the relay K1-to be opened by the battery management unit BMU to cut off the branch, namely the first battery pack is cut off;

assuming that the relay K2+, the relay K2-are also connected in series with the switch, as shown in fig. 2, the switch includes relay K3+, relay K3-, the relay K3+ is connected in series with relay K2+, and the relay K3-is connected in series with relay K2-, then after closing relay K2-, relay K3-is also closed, and similarly after closing relay K2+, relay K3+ is also closed.

If the second battery pack has a battery fault, after the second battery pack is overhauled, the first battery pack and the second battery pack also need to be charged, firstly, the battery management unit BMU controls the relay K2+ ', the relay K2-' to be closed in sequence, and if the relay K1+ ', the relay K1-' are closed, the relay K1+ ', the relay K1-', so as to charge the second battery pack until the second battery pack is fully charged. Then, the first battery pack is charged in the same manner until fully charged.

Assuming that the relay K1+ ', the relay K1-' are also connected in series with a switch, as shown in fig. 2, the switch includes a relay K4+, a relay K4-, the relay K4+ is connected in series with a relay K1+ ', the relay K4-is connected in series with a relay K1-', and the relay K4+, the relay K4-needs to be closed before the relay K1+ ', the relay K1-'.

It should be noted that, if the first battery pack has a battery failure, the charging operation is similar to the charging operation of the second battery pack, and detailed description thereof is omitted.

It is to be noted that the specific embodiments of the method embodiments are described in detail in the specific embodiments of the system embodiments, and thus are not described in detail herein.

In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

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System and method for automatically connecting and disconnecting power battery

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