Power battery system, power system of electric excavator and heating control method
阅读说明:本技术 动力电池系统、电动挖掘机动力系统和加热控制方法 (Power battery system, power system of electric excavator and heating control method ) 是由 明巧红 汪春晖 吴旭峰 于 2020-06-08 设计创作,主要内容包括:本申请提供了一种动力电池系统、电动挖掘机动力系统和加热控制方法,动力电池系统包括动力电池、直流充电正继电器、加热继电器、电池加热元件及控制电路;动力电池通过直流充电正继电器与充电机电性连接;加热继电器及电池加热元件串联后与动力电池连接,形成加热回路,加热继电器闭合时导通动力电池的加热回路为动力电池加热;充电机还用于为加热回路供电;控制电路与动力电池、加热继电器及直流充电正继电器电性连接,用于根据动力电池的温度控制加热继电器及直流充电正继电器的开断,在低温条件下为动力电池加热,提高动力电池在低温条件下的充电效率。(The application provides a power battery system, an electric excavator power system and a heating control method, wherein the power battery system comprises a power battery, a direct-current charging positive relay, a heating relay, a battery heating element and a control circuit; the power battery is electrically connected with the charger through the direct current charging positive relay; the heating relay and the battery heating element are connected in series and then are connected with the power battery to form a heating loop, and the heating loop which is used for conducting the power battery is switched on when the heating relay is closed to heat the power battery; the charger is also used for supplying power to the heating loop; the control circuit is electrically connected with the power battery, the heating relay and the direct-current charging positive relay and is used for controlling the heating relay and the direct-current charging positive relay to be switched on and off according to the temperature of the power battery and heating the power battery under the low-temperature condition, so that the charging efficiency of the power battery under the low-temperature condition is improved.)
1. A power battery system is characterized in that the power battery system comprises a power battery, a direct-current charging positive relay, a heating relay, a battery heating element and a control circuit;
the power battery is electrically connected with a charger through the direct current charging positive relay;
the heating relay and the battery heating element are connected in series and then are connected with the power battery to form a heating loop, and the heating loop of the power battery is conducted to heat the power battery when the heating relay is closed;
the charger is also used for supplying power to the heating loop;
the control circuit is electrically connected with the power battery, the heating relay and the direct current charging positive relay and used for controlling the heating relay and the direct current charging positive relay to be switched on and off according to the temperature of the power battery.
2. The power battery system of claim 1, further comprising a pre-charge relay and a pre-charge resistor;
the pre-charging relay and the pre-charging resistor are arranged between the charger and the power battery and are connected with the direct-current charging positive relay in parallel.
3. The power cell system of claim 2, further comprising a heating fuse;
the heating fuse is arranged in series between the battery heating element and the heating relay.
4. The power battery system of any of claims 1-3, wherein the control circuit comprises a battery management system;
the battery management system is electrically connected with the power battery and is used for collecting the temperature of the power battery and controlling the direct-current charging positive relay and the heating relay to be switched on and off; when the temperature of the power battery is smaller than a first preset value, controlling the heating relay to be closed, otherwise, controlling the direct-current charging positive relay to be closed; after the heating relay is closed, when the temperature of the power battery is greater than a second preset value, controlling the direct-current charging positive relay to be closed; when the temperature of the power battery is greater than a third preset value, controlling the heating relay to be switched off;
the battery management system is also used for controlling the on-off of the pre-charging relay.
5. The power battery system of any of claims 1-3, wherein the control circuit further comprises a temperature sensor and a comparison circuit;
the temperature sensor is arranged on the power battery and used for collecting the temperature of the power battery;
the plurality of comparison circuits comprise a first comparison circuit, a second comparison circuit and a third comparison circuit;
the first comparison circuit is electrically connected with the heating relay and the direct current charging positive relay and is used for comparing the temperature of the power battery with a first preset value, when the temperature of the power battery is smaller than the first preset value, the heating relay is controlled to be closed, otherwise, the direct current charging positive relay is controlled to be closed;
the second comparison circuit is electrically connected with the direct-current charging positive relay and is used for comparing the temperature of the power battery with a second preset value and controlling the direct-current charging positive relay to be closed when the temperature of the power battery is greater than the second preset value after the heating relay is closed;
and the third comparison circuit is electrically connected with the heating relay and used for comparing the temperature of the power battery with a third preset value, and when the temperature of the power battery is greater than the third preset value, the heating relay is controlled to be switched off.
6. An electric excavator power system is characterized by comprising an integrated controller and the power battery system as claimed in any one of claims 1 to 5, wherein the integrated controller comprises a charger and a vehicle control unit;
the power system of the electric excavator further comprises a display and control integrated machine;
and the display and control integrated machine is in communication connection with the power battery system and the integrated controller and is used for receiving and displaying information sent by the power battery system and the integrated controller.
7. A heating control method applied to a power battery system in an electric excavator power system according to claim 6, the method comprising:
acquiring the temperature of the power battery, and judging whether the temperature is less than a first preset value;
if the current is less than the first preset value, the heating relay is closed to heat the power battery;
if the current is not less than the first preset value, the direct current charging positive relay is closed, and the pure charging state is entered;
after the heating relay is closed, judging whether the temperature of the power battery is greater than a second preset value or not within a preset time period;
if the current is greater than the second preset value, the direct current charging positive relay is closed, and the charging and heating state is entered;
after the direct current charging positive relay is closed, judging whether the temperature of the power battery is greater than a third preset value or not within a preset time period;
and if the voltage is larger than the preset value, the heating relay is disconnected, and the pure charging state is entered.
8. The method of claim 7, further comprising, prior to closing the heating relay:
judging whether the charging current output by the charger is greater than a fourth preset value or not;
if the charging current is larger than a fourth preset value, closing the heating relay;
and if the charging current is not greater than the fourth preset value, feeding information back to the charger so that the charger increases the output charging current.
9. The method of claim 8, wherein prior to obtaining the temperature of the power cell, the method further comprises:
and closing the pre-charging relay, entering a pre-charging control process, and pre-charging the electric quantity for the power battery.
10. The method of claim 9, wherein closing the pre-charge relay, entering a pre-charge control scheme, comprises:
receiving information fed back by the display and control integrated machine and entering a charging mode;
judging whether the handshaking connection with the charger is successful or not;
if the handshake connection is successful, closing the pre-charging relay and entering a pre-charging mode;
judging whether the pre-charging is successful;
if the pre-charging is successful, the pre-charging relay is disconnected; if the pre-charging is not successful, the charging is terminated and the fault is reported.
Technical Field
The application relates to the field of power batteries, in particular to a power battery system, an electric excavator power system and a heating control method.
Background
At present, most electric excavators all adopt lithium ion batteries as the preferred power battery, but the operating environment of electric excavators is comparatively abominable, needs long-time work, and probably has the scene that needs long-time operation under the low temperature environment, and lithium ion batteries can lead to the negative pole to analyse lithium when carrying out heavy current charging under the low temperature environment, causes the battery capacity to descend, and the metal lithium that precipitates still can lead to the battery internal short circuit.
How to enable the power battery of the electric excavator to still have the capability of quick charging at low temperature (lower than 0 ℃), and improving the charging efficiency of a battery system at low temperature is a problem to be solved by the technical personnel in the field.
Disclosure of Invention
In order to overcome at least the above-mentioned deficiencies in the prior art, it is an object of the present application to provide a power battery system, an electric excavator power system and a heating control method.
In a first aspect, an embodiment of the present invention provides a power battery system, where the power battery system includes a power battery, a direct-current charging positive relay, a heating relay, a battery heating element, and a control circuit;
the power battery is electrically connected with the charger through the direct current charging positive relay;
the heating relay and the battery heating element are connected in series and then are connected with the power battery to form a heating loop, and the heating loop which is used for conducting the power battery is switched on when the heating relay is closed to heat the power battery;
the charger is also used for supplying power to the heating loop;
the control circuit is electrically connected with the power battery, the heating relay and the direct current charging positive relay and is used for controlling the heating relay and the direct current charging positive relay to be switched on and off according to the temperature of the power battery.
In an alternative embodiment, the power battery system further comprises a pre-charge relay and a pre-charge resistor;
the pre-charging relay and the pre-charging resistor are arranged between the charger and the power battery and are connected with the direct-current charging positive relay in parallel.
In an alternative embodiment, the power cell system further comprises a heating fuse;
the heating fuse is arranged between the battery heating element and the heating relay in series.
In an alternative embodiment, the control circuit includes a battery management system;
the battery management system is electrically connected with the power battery and is used for collecting the temperature of the power battery and controlling the direct-current charging positive relay and the heating relay to be switched on and off; when the temperature of the power battery is lower than a first preset value, controlling a heating relay to be closed, otherwise, controlling a direct-current charging positive relay to be closed; after the heating relay is closed, when the temperature of the power battery is greater than a second preset value, controlling the direct-current charging positive relay to be closed; when the temperature of the power battery is greater than a third preset value, controlling the heating relay to be disconnected;
the battery management system is also used for controlling the on-off of the pre-charging relay.
In an optional embodiment, the control circuit further comprises a temperature sensor and a comparison circuit;
the temperature sensor is arranged on the power battery and used for collecting the temperature of the power battery;
the plurality of comparison circuits comprise a first comparison circuit, a second comparison circuit and a third comparison circuit;
the first comparison circuit is electrically connected with the heating relay and the direct-current charging positive relay and is used for comparing the temperature of the power battery with a first preset value, when the temperature of the power battery is smaller than the first preset value, the heating relay is controlled to be closed, otherwise, the direct-current charging positive relay is controlled to be closed;
the second comparison circuit is electrically connected with the direct-current charging positive relay and is used for comparing the temperature of the power battery with a second preset value and controlling the direct-current charging positive relay to be closed after the heating relay is closed and when the temperature of the power battery is greater than the second preset value;
and the third comparison circuit is electrically connected with the heating relay and used for comparing the temperature of the power battery with a third preset value, and when the temperature of the power battery is greater than the third preset value, the heating relay is controlled to be switched off.
In a second aspect, an embodiment of the present invention provides an electric excavator power system, including an integrated controller and a power battery system according to any one of the foregoing embodiments, where the integrated controller includes a charger and a vehicle controller;
the power system of the electric excavator further comprises a display and control integrated machine;
and the display and control integrated machine is in communication connection with the power battery system and the integrated controller and is used for receiving and displaying information sent by the power battery system and the integrated controller.
In a third aspect, an embodiment of the present invention provides a heating control method, where the method is applied to a power battery system in an electric excavator power system in the foregoing embodiment, and the method includes:
acquiring the temperature of the power battery, and judging whether the temperature is smaller than a first preset value;
if the current is less than the first preset value, the heating relay is closed to heat the power battery;
if the voltage is not less than the first preset value, closing the direct current charging positive relay to enter a pure charging state;
after the heating relay is closed, judging whether the temperature of the power battery is greater than a second preset value or not within a preset time period;
if the current is greater than the second preset value, the direct current charging positive relay is closed, and the state of charging and heating is entered;
after the direct current charging positive relay is closed, judging whether the temperature of the power battery is greater than a third preset value or not within a preset time period;
if the voltage is larger than the preset value, the heating relay is switched off, and the pure charging state is entered.
In an alternative embodiment, prior to closing the heating relay, the method further comprises:
judging whether the charging current output by the charger is greater than a fourth preset value or not;
if the charging current is greater than the fourth preset value, closing the heating relay;
and if the charging current is not greater than the fourth preset value, feeding back the information to the charger so that the charger increases the output charging current.
In an alternative embodiment, before obtaining the temperature of the power cell, the method further comprises:
and closing the pre-charging relay, entering a pre-charging control flow, and pre-charging the electric quantity of the power battery.
In an alternative embodiment, closing the pre-charge relay and entering a pre-charge control flow includes:
receiving information fed back by the display and control integrated machine and entering a charging mode;
judging whether the handshaking connection with the charger is successful or not;
if the handshake connection is successful, closing a pre-charging relay and entering a pre-charging mode;
judging whether the pre-charging is successful;
if the pre-charging is successful, the pre-charging relay is disconnected; if the pre-charging is not successful, the charging is terminated and the fault is reported.
Compared with the prior art, the method has the following beneficial effects:
the application provides a power battery system, an electric excavator power system and a heating control method, wherein the power battery system comprises a power battery, a direct-current charging positive relay, a heating relay, a battery heating element and a control circuit; the power battery is electrically connected with the charger through the direct current charging positive relay; the heating relay and the battery heating element are connected in series and then are connected with the power battery to form a heating loop, and the heating loop which is used for conducting the power battery is switched on when the heating relay is closed to heat the power battery; the charger is also used for supplying power to the heating loop; the control circuit is electrically connected with the power battery, the heating relay and the direct-current charging positive relay and is used for controlling the heating relay and the direct-current charging positive relay to be switched on and off according to the temperature of the power battery and heating the power battery under the low-temperature condition, so that the charging efficiency of the power battery under the low-temperature condition is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 is one of the block diagrams of a power battery system provided by an embodiment of the present application;
FIG. 2 is a second block diagram of a power battery system according to an embodiment of the present disclosure;
FIG. 3 is a third block diagram of a power battery system according to an embodiment of the present disclosure;
fig. 4 is a structural diagram of a power system of an electric excavator provided in an embodiment of the present application;
fig. 5 is a flowchart of a heating control method according to an embodiment of the present application;
fig. 6 is a second flowchart of a heating control method according to an embodiment of the present application;
fig. 7 is a flowchart illustrating sub-steps of step S109 in fig. 7 according to an embodiment of the present disclosure.
Icon: 10-electric excavator power system; 100-power battery system; 101-a power battery; 102-a direct current charging positive relay; 103-a heating relay; 104-a battery heating element; 105-a control circuit; 1051-a battery management system; 106-a pre-charge relay; 107-precharge resistance; 108-heating the fuse; 200-an integrated controller; 201-a charger; 202-vehicle control unit; 203-display and control integrated machine.
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. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. 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.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 in a specific case by those of ordinary skill in the art.
Referring to fig. 1, fig. 1 is a block diagram of a
The
The
the
The
Specifically, in the present embodiment, when the temperature of the
When the temperature of the
During the charging and discharging transient, the transient current is too large or damages most of the electronic components. For example, the capacitor may be damaged due to the excessive instantaneous current, and the switching device such as the dc contactor may also be damaged. Therefore, referring to fig. 2, fig. 2 is a second structural diagram of a
The
In this embodiment, before the
With continued reference to fig. 2, in the present embodiment, the
When the current of the whole heating circuit is too large and the heating temperature of the
Referring to fig. 3, fig. 3 is a third structural diagram of a
When the temperature of the
After the
When the temperature of the
The
Optionally, in other embodiments of this embodiment, the
The temperature sensor is arranged on the
The plurality of comparison circuits comprise a first comparison circuit, a second comparison circuit and a third comparison circuit;
the first comparison circuit is electrically connected with the
The second comparison circuit is electrically connected to the dc charging
The third comparison circuit is electrically connected to the
By the above way, the
Referring to fig. 4, fig. 4 is a structural diagram of an electric excavator power system 10 according to an embodiment of the present disclosure, in the embodiment, the electric excavator power system 10 includes an integrated controller 200 and the
In the present embodiment, the integrated controller 200 includes a
The
Referring to fig. 4, the power system 10 of the electric excavator further includes a display and control integrated machine 203.
The display and control integrated machine 203 is in communication connection with the
Optionally, in this embodiment, the display and control all-in-one machine 203 is connected to the
Referring to fig. 5, fig. 5 is a flowchart of a heating control method according to an embodiment of the present disclosure. In the present embodiment, the method is applied to a
step S110, obtaining the temperature of the
And step S120, if the temperature is smaller than the first preset value, the
In step S130, if not less than the first preset value, the dc charging
Step S140, determining whether the temperature is greater than a second preset value within a preset time period.
In step S150, if the voltage is greater than the second preset value, the dc charging
Step S160, determining whether the temperature of the
In step S170, if yes, the
In the above steps, after the
Optionally, referring to fig. 6, fig. 6 is a second flowchart of the heating control method according to the embodiment of the present application. In this embodiment, before step S120, the method further includes:
step S111, determining whether the charging current output by the
If the charging current is greater than the fourth preset value, the step S120 is performed, and the
In the above steps, the charging current is also used to ensure the normal operation of the
Optionally, referring to fig. 6 again, in this embodiment, before step S110, the method further includes:
step S109, the
Specifically, referring to fig. 7, fig. 7 is a flowchart illustrating sub-steps of step S109 in fig. 7 according to an embodiment of the present disclosure. In the present embodiment, step S109 includes:
and a substep S1091 of receiving the information of entering the charging mode fed back by the display and control all-in-one machine 203.
And a substep S1092 of determining whether the handshake connection with the
In the substep S1093, if the handshake connection is successful, the
Substep S1094, judge whether the pre-charging succeeds;
in the substep S1095, if the precharge is successful, the
And a substep S1096, if the pre-charging is unsuccessful, terminating the charging and reporting the fault.
In the sub-steps, when the
The above description is only for various embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present application, and all such changes or substitutions are intended to be included in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
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