Battery pack module control system and battery system

Abstract

The utility model relates to the technical field of batteries, and discloses a battery pack module control system and a battery system, the system comprises a battery control module and a battery management module; the battery management module comprises a plurality of switching circuits, and the switching circuits are connected between any two battery pack modules; the switching circuit is used for controlling the on-off of the battery pack module in the battery management module; the battery control module is connected with the battery management module, and the battery management module is used for controlling the on-off of the switching circuit so as to control the on-off of the battery pack module in the battery management module. According to the utility model, the switch circuit is used for controlling whether the battery pack modules are connected in series in the circuit or not, and the battery control module is used for controlling the on-off of the switch circuit, so that when the battery pack modules are subjected to thermal runaway, the battery pack modules subjected to thermal runaway are isolated outside the circuit through the switch circuit; therefore, it is ensured that when the battery pack modules are subjected to thermal runaway, electric power can still be provided for the whole vehicle through the remaining battery pack modules which work normally, and the driving safety is ensured.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery pack module control system and a battery system. Background Technology

[0002] When a battery pack experiences thermal runaway, the battery system immediately loses power, causing the entire vehicle to lose power. If the vehicle is traveling at high speed at this time, there is a significant risk of loss of control. Therefore, a battery system that can maintain vehicle power even when the battery pack experiences thermal runaway is needed to improve driving safety. Utility Model Content

[0003] In view of this, the present invention provides a battery pack module control system and a battery system to solve the problem of vehicle power loss and low driving safety when the current battery pack experiences thermal runaway.

[0004] In a first aspect, this utility model provides a battery pack module control system that is connected to multiple battery pack modules. The system includes a battery control module and a battery management module.

[0005] The battery management module includes multiple switching circuits, which are connected between any two battery pack modules. The switching circuits are used to control the on / off state of the battery pack modules within the battery management module.

[0006] The battery control module is connected to the battery management module. The battery management module is used to control the switching circuit to control the on / off state of the battery pack module within the battery management module.

[0007] The battery pack module control system provided in this embodiment connects switching circuits between battery pack modules. These switching circuits control whether the battery pack modules are connected in series in the circuit. The battery control module controls the on / off state of the switching circuits. Thus, when a battery pack module experiences thermal runaway, the switching circuits isolate the thermally runaway battery pack module from the circuit. This ensures that even when a battery pack module experiences thermal runaway, it can still provide power to the vehicle through the remaining normally functioning battery pack modules, thus guaranteeing driving safety.

[0008] In one optional implementation, the plurality of battery pack modules include a first module, a second module, a third module, and a fourth module; the plurality of switching circuits include a first switching circuit, a second switching circuit, a third switching circuit, a fourth switching circuit, a fifth switching circuit, a sixth switching circuit, a seventh switching circuit, and an eighth switching circuit.

[0009] The positive terminal of the first module and the negative terminal of the fourth module are connected in series through the first and second switching circuits; the positive terminal of the second module and the negative terminal of the first module are connected in series through the third and fourth switching circuits.

[0010] The positive terminal of the third module is connected in series with the negative terminal of the second module through the fifth and sixth switching circuits; the positive terminal of the fourth module is connected in series with the negative terminal of the third module through the seventh and eighth switching circuits.

[0011] In one alternative implementation, the plurality of switching circuits further includes a ninth switching circuit, a tenth switching circuit, an eleventh switching circuit, and a twelfth switching circuit.

[0012] The common terminal of the first switch circuit and the second switch circuit and the common terminal of the fifth switch circuit and the sixth switch circuit are connected in series through the ninth switch circuit and the tenth switch circuit.

[0013] The common terminal of the third and fourth switch circuits and the common terminal of the seventh and eighth switch circuits are connected through the eleventh and twelfth switch circuits.

[0014] In one optional implementation, when the multiple battery pack modules are in normal working condition, the first switch circuit, the second switch circuit, the ninth switch circuit, the tenth switch circuit, the eleventh switch circuit, and the twelfth switch circuit are in the off state, while the third switch circuit, the fourth switch circuit, the fifth switch circuit, the sixth switch circuit, the seventh switch circuit, and the eighth switch circuit are in the on state.

[0015] In one optional implementation, when the first module is in a thermal runaway state, the first switching circuit, the tenth switching circuit, and the eleventh switching circuit are in a conducting state, while the third switching circuit is in a disconnected state.

[0016] In one alternative implementation, when the second module is in a thermal runaway state, the ninth and eleventh switching circuits are in a conducting state, while the fourth and fifth switching circuits are in a disconnected state.

[0017] In one alternative implementation, when the third module is in a thermal runaway state, the ninth and twelfth switching circuits are in a conducting state, while the sixth and seventh switching circuits are in a disconnected state.

[0018] In one alternative implementation, when the fourth module is in a thermal runaway state, the second, tenth, and twelfth switching circuits are in a conducting state, while the eighth switching circuit is in a disconnected state.

[0019] In one optional implementation, the system further includes a voltage conversion module, one end of which is connected to the battery control module and the other end of which is connected to the battery management module.

[0020] The voltage conversion module is used to boost the voltage provided by the battery control module when the battery pack module is in a thermal runaway state, and then provide the boosted voltage to the battery management module.

[0021] Secondly, this utility model provides a battery system including multiple battery pack modules and a battery pack module control system as described above. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of the battery pack module control system according to an embodiment of the present utility model;

[0024] Figure 2 This is a circuit structure diagram of the battery pack module control system according to an embodiment of the present utility model;

[0025] Figure 3 This is a schematic diagram of the switching circuit when all battery pack modules are in normal working condition in the battery pack module control system according to an embodiment of the present utility model.

[0026] Figure 4 This is a schematic diagram of the operation of the switching circuit when the first module in the battery pack module control system is in a thermal runaway state according to an embodiment of the present utility model.

[0027] Figure 5 This is a schematic diagram of the operation of the switching circuit when the second module in the battery pack module control system according to an embodiment of the present invention is in a thermal runaway state;

[0028] Figure 6 This is a schematic diagram of the operation of the switching circuit when the third module in the battery pack module control system is in a thermal runaway state according to an embodiment of the present utility model.

[0029] Figure 7 This is a schematic diagram of the switching circuit when the fourth module in the battery pack module control system according to an embodiment of the present invention is in a thermal runaway state.

[0030] Explanation of reference numerals in the attached diagram: 1. Battery control module; 101. First switch circuit; 102. Second switch circuit; 103. Third switch circuit; 104. Fourth switch circuit; 105. Fifth switch circuit; 106. Sixth switch circuit; 107. Seventh switch circuit; 108. Eighth switch circuit; 109. Ninth switch circuit; 110. Tenth switch circuit; 111. Eleventh switch circuit; 112. Twelfth switch circuit; 2. Battery management module; 3. Voltage conversion module; 41. First module; 42. Second module; 43. Third module; 44. Fourth module. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0032] In the description of this application, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0033] When the battery pack experiences thermal runaway, the battery system will immediately lose power, causing the entire vehicle to lose power. If the vehicle is traveling at high speed at this time, there will be a great risk of loss of control, resulting in certain safety hazards.

[0034] Based on this, the present invention provides a battery pack module control system. By connecting a switching circuit between battery pack modules, the switching circuit controls whether the battery pack modules are connected in series in the circuit. The battery control module controls the on / off state of the switching circuit. Thus, when a battery pack module experiences thermal runaway, the switching circuit isolates the thermally runaway battery pack module from the circuit. This ensures that even when a battery pack module experiences thermal runaway, it can still provide power to the vehicle through the remaining normally functioning battery pack modules, thus ensuring driving safety.

[0035] On the one hand, this embodiment provides a battery pack module control system. The system is connected to multiple battery pack modules. By controlling whether the battery pack modules are connected in the circuit, the system can isolate the battery pack modules that are thermally runaway. Thus, when the battery pack modules experience thermal runaway, the system can still provide power to the vehicle through the remaining normally functioning battery pack modules, ensuring driving safety.

[0036] Figure 1 This is a structural schematic diagram of the battery pack module control system according to an embodiment of the present utility model, as shown below. Figure 1 As shown, the system includes a battery control module 1 and a battery management module 2. The battery management module 2 includes multiple switching circuits connected between any two battery pack modules. These switching circuits control the on / off state of the battery pack modules within the battery management module 2. The battery control module 1 is connected to the battery management module 2, and the battery management module 2 controls the on / off state of the switching circuits to control the on / off state of the battery pack modules within the battery management module 2. Therefore, when thermal runaway is detected in one or more battery pack modules, the affected battery pack module can be isolated from the circuit by controlling the on / off state of the switching circuits. This ensures that the battery pack modules connected in the circuit can continue to supply power normally, so that even in the event of thermal runaway, the remaining normally functioning battery pack modules can still provide power to the vehicle, ensuring driving safety.

[0037] In an optional implementation, the battery control module 1 may include a battery management system (BMS) and a battery disconnect unit (BDU). The BMS and BDU monitor relevant operating data of the battery pack module, such as voltage, current, and temperature. The BMS controls the battery pack module by monitoring its operating data to prevent overcharging or over-discharging. In this embodiment, the BMS also controls the switching circuit. The BDU evaluates the operating status of the battery pack module by monitoring its operating data. If abnormalities are found in the operating data, the BDU executes corresponding control strategies to protect the battery pack module.

[0038] In one alternative implementation, such as Figure 1As shown, the system also includes a voltage conversion module 3. One end of the voltage conversion module 3 is connected to the battery control module 1, and the other end is connected to the battery management module 2. The voltage conversion module 3 is used to boost the voltage provided by the battery control module 1 when the battery pack module is in a thermal runaway state, and then provide the boosted voltage to the battery management module 2. Since the battery pack module experiencing thermal runaway is isolated from the circuit, the number of battery pack modules that can normally supply power is reduced. Therefore, the voltage conversion module 3 boosts the voltage to ensure that the voltage output by the battery pack module remains stable and meets the requirements of the entire vehicle.

[0039] In one optional implementation, the multiple battery pack modules include a first module 41, a second module 42, a third module 43, and a fourth module 44. It should be noted that the number of battery pack modules is not limited to four; it can be more or fewer. No specific limitation is made here; this embodiment only uses four battery pack modules as an example. Accordingly, Figure 2 This is a circuit structure diagram of the battery pack module control system according to an embodiment of the present utility model, as shown below. Figure 2 As shown, the battery control module 1 includes multiple switching circuits: a first switching circuit 101, a second switching circuit 102, a third switching circuit 103, a fourth switching circuit 104, a fifth switching circuit 105, a sixth switching circuit 106, a seventh switching circuit 107, and an eighth switching circuit 108. These switching circuits are connected between the positive terminal of one battery pack module and the negative terminal of another battery pack module. Specifically, the positive terminal of the first module 41 and the negative terminal of the fourth module 44 are connected in series via the first switching circuit 101 and the second switching circuit 102; the positive terminal of the second module 42 and the negative terminal of the first module 41 are connected in series via the third switching circuit 103 and the fourth switching circuit 104; the positive terminal of the third module 43 and the negative terminal of the second module 42 are connected in series via the fifth switching circuit 105 and the sixth switching circuit 106; and the positive terminal of the fourth module 44 and the negative terminal of the third module 43 are connected in series via the seventh switching circuit 107 and the eighth switching circuit 108.

[0040] In one alternative implementation, such as Figure 2 As shown, the multiple switching circuits also include a ninth switching circuit 109, a tenth switching circuit 110, an eleventh switching circuit 111, and a twelfth switching circuit 112. The common terminal of the first switching circuit 101 and the second switching circuit 102, and the common terminal of the fifth switching circuit 105 and the sixth switching circuit 106, are connected in series through the ninth switching circuit 109 and the tenth switching circuit 110; the common terminal of the third switching circuit 103 and the fourth switching circuit 104, and the common terminal of the seventh switching circuit 107 and the eighth switching circuit 108, are connected through the eleventh switching circuit 111 and the twelfth switching circuit 112.

[0041] Therefore, through the above connection method, any two battery pack modules can be connected, and a switch circuit can be connected in series to control whether the connection between any two battery pack modules is made. By controlling the on and off of the switch circuit, any battery pack module can be connected in series or isolated from the circuit. In the event of thermal runaway in any battery pack module, the battery pack module experiencing thermal runaway can be isolated, while ensuring the power supply to the battery pack, preventing the entire vehicle from losing power, and ensuring driving safety.

[0042] The following combination Figures 3-7 The working principle of the battery pack module control system of this application is described in detail.

[0043] Figure 3 This is a schematic diagram of the switching circuit when all battery pack modules in the battery pack module control system according to an embodiment of the present invention are in normal working condition. Figure 3 As shown, when multiple battery pack modules are in normal working condition, the battery management module 2 controls the switching circuits to open and close, keeping the first switching circuit 101, second switching circuit 102, ninth switching circuit 109, tenth switching circuit 110, eleventh switching circuit 111, and twelfth switching circuit 112 in the open state, and the third switching circuit 103, fourth switching circuit 104, fifth switching circuit 105, sixth switching circuit 106, seventh switching circuit 107, and eighth switching circuit 108 in the closed state. At this time, the first module 41, second module 42, third module 43, and fourth module 44 are connected in series, and all four battery pack modules supply power to the outside.

[0044] In one alternative implementation, Figure 4 This is a schematic diagram of the switching circuit in the battery pack module control system according to an embodiment of the present invention when the first module is in a thermal runaway state. Figure 4 As shown, when the first module 41 is in a thermal runaway state, it is necessary to isolate the first module 41 from the circuit. The battery management module 2 controls the switching circuit to keep the first switching circuit 101, the tenth switching circuit 110, and the eleventh switching circuit 111 in the conducting state, the third switching circuit 103 in the open state, and the other switching circuits in the closed state. Figure 3The state shown remains unchanged. At this time, since the third switch circuit 103 is in the open state, the connection between the first module 41 and other battery pack modules is disconnected, and the second module 42, the third module 43 and the fourth module 44 are connected in series in sequence, while the first module 41 is isolated from the circuit; at the same time, the first switch circuit 101, the tenth switch circuit 110 and the eleventh switch circuit 111 are turned on, connecting the positive terminal of the second module 42 to the voltage conversion module 3, ensuring normal connection between the battery control module 1 and the voltage conversion module 3, thereby boosting the voltage output of the three battery pack modules through the voltage conversion module 3, ensuring that the external output voltage remains stable and can meet the requirements of the whole vehicle.

[0045] In one alternative implementation, Figure 5 This is a schematic diagram of the switching circuit in the battery pack module control system according to an embodiment of the present invention when the second module is in a thermal runaway state. Figure 5 As shown, when the second module 42 is in a thermal runaway state, it needs to be isolated from the circuit. The battery management module 2 controls the switching circuit to keep the ninth switching circuit 109 and the eleventh switching circuit 111 in the conducting state, while the fourth switching circuit 104 and the fifth switching circuit 105 are in the disconnected state. The other switching circuits remain open. Figure 3 The state shown remains unchanged. At this time, since the fourth switch circuit 104 and the fifth switch circuit 105 are in the open state, the connection between the second module 42 and other battery pack modules is disconnected, thereby isolating the second module 42 from the circuit; at the same time, by controlling the ninth switch circuit 109 and the eleventh switch circuit 111 to conduct, the negative terminal of the first module 41 and the positive terminal of the third module 43 are connected, avoiding the disconnection between the first module 41 and the third module 43 due to the isolation of the second module 42. Thus, the first module 41, the third module 43 and the fourth module 44 are connected in series, and the voltage output of the three battery pack modules is boosted by the voltage conversion module 3 to ensure that the external output voltage remains stable and can meet the requirements of the whole vehicle.

[0046] In one alternative implementation, Figure 6 This is a schematic diagram of the switching circuit in the battery pack module control system according to an embodiment of the present invention when the third module is in a thermal runaway state. Figure 6 As shown, when the third module 43 is in a thermal runaway state, it needs to be isolated from the circuit. The battery management module 2 controls the switching circuit to keep the ninth switching circuit 109 and the twelfth switching circuit 112 in the conducting state, the sixth switching circuit 106 and the seventh switching circuit 107 in the open state, and the other switching circuits remain open. Figure 3The state shown remains unchanged. At this time, since the sixth switch circuit 106 and the seventh switch circuit 107 are in the open state, the connection between the third module 43 and other battery pack modules is disconnected, thereby isolating the third module 43 from the circuit; at the same time, by controlling the ninth switch circuit 109 and the twelfth switch circuit 112 to conduct, the negative terminal of the second module 42 and the positive terminal of the fourth module 44 are connected, avoiding the disconnection between the second module 42 and the fourth module 44 due to the isolation of the third module 43. Thus, the first module 41, the second module 42 and the fourth module 44 are connected in series, and the voltage output of the three battery pack modules is boosted by the voltage conversion module 3 to ensure that the external output voltage remains stable and can meet the requirements of the whole vehicle.

[0047] In one alternative implementation, Figure 7 This is a schematic diagram of the switching circuit in the battery pack module control system according to an embodiment of the present invention when the fourth module is in a thermal runaway state. Figure 7 As shown, when the fourth module 44 is in a thermal runaway state, it is necessary to isolate the fourth module 44 from the circuit and control the switching circuit through the battery management module 2 to make the second switching circuit 102, the tenth switching circuit 110, and the twelfth switching circuit 112 in the conducting state, the eighth switching circuit 108 in the open state, and the other switching circuits remain in the closed state. Figure 3 The state shown remains unchanged. At this time, since the eighth switch circuit 108 is in the open state, the connection between the fourth module 44 and other battery pack modules is disconnected. The first module 41, the second module 42, and the third module 43 are connected in series, while the fourth module 44 is isolated from the circuit. At the same time, the second switch circuit 102, the tenth switch circuit 110, and the twelfth switch circuit 112 are turned on, connecting the negative terminal of the third module 43 to the voltage conversion module 3, ensuring normal connection between the battery control module 1 and the voltage conversion module 3. Thus, the voltage output from the three battery pack modules is boosted through the voltage conversion module 3 to ensure that the external output voltage remains stable and meets the requirements of the vehicle.

[0048] It should be noted that, Figures 4-7 This example illustrates the control of the switching circuits when a battery pack module experiences thermal runaway. It does not mean that the battery pack module control system in this embodiment is only applicable to the case of thermal runaway in one battery pack module. Even when multiple battery pack modules experience thermal runaway, the switching circuits can still be controlled to isolate all affected battery pack modules from the circuit. For example, if the first module 41 and the second module 42 experience thermal runaway, the third switching circuit 103, the fourth switching circuit 104, and the fifth switching circuit 105 can be disconnected, while the first switching circuit 101, the ninth switching circuit 109, and the tenth switch can be closed individually. The other switching circuits remain open. Figure 3The state shown remains unchanged, thereby enabling the third module 43 and the fourth module 44 to be connected in series and connected to the voltage conversion module 3, and isolating the first module 41 and the second module 42 from the circuit.

[0049] On the other hand, this embodiment provides a battery system including multiple battery pack modules and a battery pack module control system as described above.

[0050] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the present invention.

Claims

1. A battery pack module control system, characterized by, The system is connected with a plurality of battery pack modules, and comprises a battery control module (1) and a battery management module (2); The battery management module (2) comprises a plurality of switch circuits connected between any two battery pack modules; the switch circuits are used for controlling the on-off of the battery pack modules in the battery management module (2); The battery control module (1) is connected with the battery management module (2), and the battery management module (2) is used for controlling the on-off of the switch circuits to control the on-off of the battery pack modules in the battery management module (2).

2. The system of claim 1, wherein, The plurality of battery pack modules comprises a first module (41), a second module (42), a third module (43) and a fourth module (44); and the plurality of switch circuits comprises a first switch circuit (101), a second switch circuit (102), a third switch circuit (103), a fourth switch circuit (104), a fifth switch circuit (105), a sixth switch circuit (106), a seventh switch circuit (107) and an eighth switch circuit (108). The positive electrode of the first module (41) and the negative electrode of the fourth module (44) are connected in series through the first switch circuit (101) and the second switch circuit (102); the positive electrode of the second module (42) and the negative electrode of the first module (41) are connected in series through the third switch circuit (103) and the fourth switch circuit (104); The positive electrode of the third module (43) and the negative electrode of the second module (42) are connected in series through the fifth switch circuit (105) and the sixth switch circuit (106); and the positive electrode of the fourth module (44) and the negative electrode of the third module (43) are connected in series through the seventh switch circuit (107) and the eighth switch circuit (108).

3. The system of claim 2, wherein, The plurality of switch circuits further comprises a ninth switch circuit (109), a tenth switch circuit (110), an eleventh switch circuit (111) and a twelfth switch circuit (112); The common end of the first switch circuit (101) and the second switch circuit (102) and the common end of the fifth switch circuit (105) and the sixth switch circuit (106) are connected in series through the ninth switch circuit (109) and the tenth switch circuit (110); The common end of the third switch circuit (103) and the fourth switch circuit (104) and the common end of the seventh switch circuit (107) and the eighth switch circuit (108) are connected through the eleventh switch circuit (111) and the twelfth switch circuit (112).

4. The system of claim 3, wherein, When the plurality of battery pack modules are in a normal working state, The first switch circuit (101), the second switch circuit (102), the ninth switch circuit (109), the tenth switch circuit (110), the eleventh switch circuit (111) and the twelfth switch circuit (112) are in an open state, The third switch circuit (103), the fourth switch circuit (104), the fifth switch circuit (105), the sixth switch circuit (106), the seventh switch circuit (107) and the eighth switch circuit (108) are in the on state.

5. The system of claim 4, wherein, When the first module (41) is in the thermal runaway state, the first switch circuit (101), the tenth switch circuit (110) and the eleventh switch circuit (111) are in the on state, and the third switch circuit (103) is in the off state.

6. The system of claim 4, wherein, When the second module (42) is in the thermal runaway state, the ninth switch circuit (109) and the eleventh switch circuit (111) are in the on state, and the fourth switch circuit (104) and the fifth switch circuit (105) are in the off state.

7. The system of claim 4, wherein, When the third module (43) is in the thermal runaway state, the ninth switch circuit (109) and the twelfth switch circuit (112) are in the on state, and the sixth switch circuit (106) and the seventh switch circuit (107) are in the off state.

8. The system of claim 4, wherein, When the fourth module (44) is in the thermal runaway state, the second switch circuit (102), the tenth switch circuit (110) and the twelfth switch circuit (112) are in the on state, and the eighth switch circuit (108) is in the off state.

9. The system of claim 1, wherein, The system further comprises a voltage conversion module (3), one end of the voltage conversion module (3) is connected with the battery control module (1), and the other end of the voltage conversion module (3) is connected with the battery management module (2). The voltage conversion module (3) is used for boosting the voltage provided by the battery control module (1) when the battery pack module is in the thermal runaway state, and providing the boosted voltage to the battery management module (2).

10. A battery system characterized by, The battery pack module control system comprises a plurality of battery pack modules and the battery pack module control system according to any one of claims 1-9. The battery pack module control system comprises a plurality of battery pack modules and the battery pack module control system according to any one of claims 1-9.

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