A battery module, a vehicle power battery system, a control method and a vehicle

Abstract

This invention discloses a battery module, a vehicle power battery system, a control method, and a vehicle. The battery module includes a cell module and at least one first voltage circuit. Each first voltage circuit includes a switch control module and a cell group. A first connection terminal of the switch control module is connected to a cell plate at one end of the cell group via a wire harness. A second connection terminal of the switch control module serves as one end of the voltage output terminal of the first voltage circuit. Another wire harness leading from the cell plate at the other end of the cell group serves as the other end of the voltage output terminal. The supply voltage of the first voltage circuit is less than a set safety voltage. The control terminal of the switch control module is used to electrically connect to the battery manager, and the voltage output terminal of the first voltage circuit is used to electrically connect to the battery cooling system. The switch control module is used to control the connection and disconnection between the first connection terminal and the second connection terminal according to the control signal sent by the battery manager, thereby controlling the connection and disconnection of the first voltage circuit.

Description

Technical Field

[0001] This invention relates to the field of power battery technology, and in particular to a battery module, a vehicle power battery system, a control method, and a vehicle. Background Technology

[0002] In the field of power battery applications, thermal runaway is a core safety hazard. Once a power battery experiences thermal runaway, the entire battery pack becomes a source of enormous energy explosion, which can easily cause serious injury to the vehicle itself and its occupants.

[0003] When a battery experiences thermal runaway, activating an external cooling system can effectively cool the runaway cell and prevent its high temperature from spreading to surrounding cells. In existing technology, when a battery pack experiences thermal runaway, the high-voltage circuit must be immediately disconnected to prevent ejected material from the runaway cell from causing arcing and short circuits in the high-voltage system, leading to more severe consequences. In this situation, the battery pack cannot supply power externally or recharge the vehicle's onboard battery. Furthermore, even if the vehicle's onboard battery is fully charged, its capacity is typically small and its energy storage limited, meaning the cooling system's water pump can only operate continuously for a short time. If the battery temperature fails to drop to a safe range before the onboard battery is depleted, the battery pack still faces the risk of heat diffusion. Therefore, how to quickly activate the cooling system's water pump and extend its operation time as much as possible when a power battery experiences thermal runaway has become a pressing technical challenge. Summary of the Invention

[0004] This application provides a battery module, a vehicle power battery system, a control method, and a vehicle, which can supply power to the cooling system based on the first voltage circuit within the battery module, effectively solving the problem that the power battery cooling system water pump cannot be turned on immediately under high voltage power-down conditions during thermal runaway.

[0005] In a first aspect, the present invention provides the following technical solution through an embodiment of the present invention: A battery module includes: a cell module comprising a plurality of cells connected in series; and at least one first voltage circuit, each first voltage circuit including a switch control module and a cell group, the cell group including at least two cells connected in series in the cell module, a first connection terminal of the switch control module being connected to a cell plate at one end of the cell group via a wire harness, a second connection terminal of the switch control module serving as one end of the voltage output terminal of the first voltage circuit, and another wire harness leading out from the cell plate at the other end of the cell group serving as the other end of the voltage output terminal, the supply voltage of the first voltage circuit being less than a set safety voltage; wherein, the control terminal of the switch control module is used for electrical connection with a battery manager, the voltage output terminal of the first voltage circuit is used for electrical connection with a battery cooling system, and the switch control module is used to control the connection and disconnection of the first voltage circuit by controlling the connection and disconnection between the first connection terminal and the second connection terminal according to the control signal sent by the battery manager.

[0006] Preferably, each first voltage circuit further includes a voltage acquisition module, which is used to acquire the voltage of each cell in the cell group; the voltage acquisition module is used to be electrically connected to the battery manager, and the control signal sent by the battery manager is determined according to the voltage of each cell in the cell group acquired by the voltage acquisition module.

[0007] Preferably, the at least one first voltage circuit includes a first sub-voltage circuit and a second sub-voltage circuit. The switch control module includes a relay. The first sub-voltage circuit includes a first relay, a first voltage acquisition module, and a first cell group. The second sub-voltage circuit includes a second relay, a second voltage acquisition module, and a second cell group. The first connection terminal of the first relay is connected to a cell plate at one end of the first cell group via a first wiring harness. The second connection terminal of the first relay serves as one end of the voltage output terminal of the first sub-voltage circuit. A second wiring harness leading from the cell plate at the other end of the first cell group serves as the other end of the voltage output terminal of the first sub-voltage circuit. The first connection terminal of the second relay is connected to a cell plate at one end of the second cell group via a third wiring harness. The second connection terminal of the second relay serves as one end of the voltage output terminal of the second sub-voltage circuit. A fourth wiring harness leading from the cell plate at the other end of the second cell group serves as the other end of the voltage output terminal of the second sub-voltage circuit. The voltage output terminals of both the first and second sub-voltage circuits are used for electrical connection with the battery cooling system.

[0008] Preferably, the battery cell assembly comprises 4 to 8 battery cells connected in series.

[0009] Secondly, through an embodiment of the present invention, the present invention provides the following technical solution: A vehicle power battery system includes: a battery module as described in any one of the first aspects above; the power supply system further includes: a second voltage circuit, including a power supply switch and a cell module, wherein the positive terminal of the cell module is connected to one end of the power supply switch, the other end of the power supply switch is used to connect to the positive terminal of a target electrical appliance, and the negative terminal of the cell module is used to connect to the negative terminal of the target electrical appliance; a battery cooling system connected to the voltage output terminal of the first voltage circuit in the battery module; and a battery manager electrically connected to the power supply switch, configured to send a disconnect signal to the power supply switch to control the power supply switch to disconnect if a thermal runaway warning signal is received; and to send a control signal to a switch control module to control the connection between the first connection terminal and the second connection terminal to control the connection of the first voltage circuit.

[0010] Preferably, each first voltage circuit in the battery module further includes a voltage acquisition module, which is electrically connected to the battery manager. The voltage acquisition module is used to acquire the voltage of each cell in the cell group. The battery manager is used to acquire the voltage of each cell in the cell group acquired by the voltage acquisition module, determine whether the voltage of each cell in the cell group is abnormal, and if all are normal, send a control signal to the switch control module to control the connection between the first connection terminal and the second connection terminal, so as to control the connection of the first voltage circuit.

[0011] Preferably, the battery module includes a first sub-voltage circuit and a second sub-voltage circuit. The first sub-voltage circuit includes a first relay, a first voltage acquisition module, and a first cell group. The second sub-voltage circuit includes a second relay, a second voltage acquisition module, and a second cell group. The battery manager is used to acquire the voltage of each cell in the first cell group acquired by the first voltage acquisition module, determine whether the voltage of each cell in the first cell group is abnormal, and if there is a cell with abnormal voltage, acquire the voltage of each cell in the second cell group acquired by the second voltage acquisition module, determine whether the voltage of each cell in the second cell group is abnormal, and if all are normal, send a control signal to the second relay to control the connection between the first connection terminal and the second connection terminal, so as to control the connection of the second low-voltage sub-circuit.

[0012] Thirdly, through one embodiment of the present invention, the following technical solution is provided: A vehicle power battery control method includes a battery manager in a vehicle power battery system as described in any of the second aspects above. The method includes: if a thermal runaway warning signal is received, sending a disconnect signal to the power supply switch to control the power supply switch to disconnect; and sending a control signal to a switch control module to control the connection between a first connection terminal and a second connection terminal to control the connection of a first voltage circuit.

[0013] Preferably, before sending the control signal to the switch control module to connect the first connection terminal and the second connection terminal, the method further includes: acquiring the voltage of each cell in the cell group acquired by the voltage acquisition module, determining whether the voltage of each cell in the cell group is abnormal, and if all are normal, sending the control signal to the switch control module to connect the first connection terminal and the second connection terminal.

[0014] Fourthly, through one embodiment of the present invention, the following technical solution is provided: A vehicle, characterized in that it includes a vehicle body and a vehicle power battery system as described in any one of the second aspects above.

[0015] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages: The battery module provided in this invention includes at least one first voltage circuit. The supply voltage of the first voltage circuit is lower than a set safety voltage. Each first voltage circuit includes a switch control module and a cell group. The cell group includes at least two cells connected in series in the cell module. A wire harness is led out from each end of the cell group. The wire harness, the cell group, and the switch control module constitute the first voltage circuit. The battery cooling system is electrically connected to the first voltage circuit, ensuring that power can still be drawn from the battery pack when the battery pack is under high voltage, and the voltage of the drawn power is low. This battery module can supply power to the cooling system based on the low-voltage circuit in the battery module when the battery pack experiences thermal runaway and high voltage drops. This effectively solves the problem that the water pump of the power battery cooling system cannot start immediately under high voltage during thermal runaway, and can extend the water pump's start-up time as much as possible, avoiding thermal diffusion between batteries during thermal runaway. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the battery module structure in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure for leading a low-voltage wire harness from the battery cell in an embodiment of the present invention; Figure 3 This is a schematic diagram of the vehicle power battery system in an embodiment of the present invention; Figure 4This is a schematic diagram of the power battery system during thermal runaway of the battery pack in an embodiment of the present invention; Figure 5 This is a schematic diagram of the control flow of the system under thermal runaway state in an embodiment of the present invention; Figure 6 This is a schematic flowchart of the vehicle power battery control method in an embodiment of the present invention; Figure 7 This is a schematic diagram of the vehicle structure in an embodiment of the present invention. Detailed Implementation

[0018] The applicant discovered that the high-voltage circuit must be disconnected during battery pack thermal runaway; otherwise, the ejected material from the runaway cells could cause arcing and short circuits in the high-voltage system, leading to even more severe consequences. Therefore, the battery pack cannot supply power to the outside world or recharge the vehicle's on-board battery during thermal runaway. If the on-board battery, which controls the coolant circulation in the cooling system, is also out of power or has a very low charge at this time, it cannot drive the cooling system pump. Consequently, the battery's cooling system circulation will be difficult to activate, making it difficult to suppress the battery pack's thermal runaway. Furthermore, because on-board batteries generally have a small capacity and low energy, even when fully charged, they cannot drive the cooling system pump for a long time. If the battery temperature does not drop before the on-board battery is completely depleted, there is still a possibility of thermal propagation from the battery pack.

[0019] In view of this, the embodiments of this application provide a battery module, a vehicle power battery system, a control method, and a vehicle, which can supply power to the cooling system based on the low-voltage circuit in the battery pack when the high-voltage circuit is cut off due to thermal runaway of the battery pack, effectively solving the problem that the water pump of the power battery cooling system cannot be turned on immediately under the high-voltage power-off state during thermal runaway.

[0020] The technical solution of this application embodiment is to solve the above-mentioned technical problems, and the general idea is as follows: A battery module includes: a cell module comprising a plurality of cells connected in series; and at least one first voltage circuit, each first voltage circuit including a switch control module and a cell group, the cell group including at least two cells connected in series in the cell module, a first connection terminal of the switch control module being connected to a cell plate at one end of the cell group via a wire harness, a second connection terminal of the switch control module serving as one end of the voltage output terminal of the first voltage circuit, and another wire harness leading out from the cell plate at the other end of the cell group serving as the other end of the voltage output terminal, the supply voltage of the first voltage circuit being less than a set safety voltage; wherein, the control terminal of the switch control module is used for electrical connection with a battery manager, the voltage output terminal of the first voltage circuit is used for electrical connection with a battery cooling system, and the switch control module is used to control the connection and disconnection between the first connection terminal and the second connection terminal according to the control signal sent by the battery manager, so as to control the connection and disconnection of the first voltage circuit.

[0021] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0022] In a first aspect, an embodiment of the present invention provides a battery module, such as... Figure 1 As shown, it includes: a battery cell module, which includes multiple battery cells connected in series; And at least one first voltage circuit 10, each first voltage circuit including a switch control module 11 and a cell group 12, the cell group 12 including at least two cells connected in series in the cell module, the first connection terminal of the switch control module 11 is connected to the cell bar at one end of the cell group via a wire harness, the second connection terminal of the switch control module serves as one end of the voltage output terminal of the first voltage circuit 10, and another wire harness led out from the cell bar at the other end of the cell group serves as the other end of the voltage output terminal of the first voltage circuit 10, the supply voltage of the first voltage circuit is less than the set safety voltage; The control terminal of the switch control module is used to be electrically connected to the battery manager (not shown), the voltage output terminal of the first voltage circuit is used to be electrically connected to the battery cooling system (not shown), and the switch control module is used to control the connection and disconnection between the first connection terminal and the second connection terminal according to the control signal sent by the battery manager, so as to control the connection and disconnection of the first voltage circuit.

[0023] Specifically, the control terminal of the switch control module is used to be electrically connected to the battery manager to receive control signals sent by the battery manager; the voltage output terminal of the first voltage circuit is used to be electrically connected to the battery cooling system to provide low-voltage power supply to the battery cooling system.

[0024] The entire cell module forms the core power supply unit of the power battery, providing high-voltage power to the vehicle and related equipment. Specifically, each first voltage circuit is a low-voltage circuit, and the supply voltage of the first voltage circuit is less than the set safety voltage. The set safety voltage can be 36V, which can effectively avoid the risk of arcing and short circuit caused by high voltage.

[0025] Specifically, the cell assembly consists of at least two cells connected in series within a cell module. As an example, the cell assembly may include 4 to 8 cells connected in series. By appropriately selecting the number of cells, the output voltage of the first voltage circuit is ensured to be within a safe low-voltage range (e.g., 8 to 17V).

[0026] like Figure 2 As shown, one possible power extraction method is listed, with the battery pack containing multiple battery cells. It should be noted that this application does not limit the number of battery cells used for power extraction, nor does it limit the outgoing direction of the low-voltage harness, as long as the power extraction voltage is lower than the 36V safety voltage and will not cause overload to external electrical appliances.

[0027] The first connection terminal of the switch control module is connected to the cell plate at one end of the cell assembly via a wire harness. The second connection terminal of the switch control module serves as one end of the voltage output terminal of the first voltage circuit. Another wire harness is led out from the cell plate at the other end of the cell assembly, serving as the other end of the voltage output terminal of the first voltage circuit, i.e., as shown below. Figure 2 As shown, two low-voltage wires are led out from the cell plates at both ends of the cell pack. At this time, even if the battery pack is under high voltage, power can still be drawn from the battery pack, and the voltage of the drawn power is relatively low.

[0028] It should be noted that a battery cell sampling pad can refer to a sampling pad for a battery cell, that is, the connection between two battery cells (the positive terminal of one battery cell and the negative terminal of the other battery cell) can be achieved by soldering sampling terminals to lead out a wire harness.

[0029] Generally, when the voltage is higher than 36V, arcing and short circuit may occur between the positive and negative terminals. However, with the solution proposed in this invention, the voltage extracted by the battery is only 8~17V, which is far below the safe voltage of 36V and will not cause arcing and short circuit between batteries.

[0030] In a specific embodiment, in order to improve the reliability of power supply, each first voltage circuit may further include a voltage acquisition module, which is used to acquire the voltage of each cell in the cell group; the voltage acquisition module is used to be electrically connected to the battery manager, and the control signal sent by the battery manager is determined according to the voltage of each cell in the cell group acquired by the voltage acquisition module.

[0031] When the voltage of each cell in the battery pack is normal, the battery manager sends a connection signal between the first and second connection terminals to the switch control module, so that the first voltage circuit can supply power to the cooling system, ensuring that the water pump of the cooling system operates normally and cooling down the runaway cells.

[0032] As an example, the voltage acquisition module in each first voltage circuit may include multiple voltage acquisition units. The number of voltage acquisition units is equal to the number of cells in the cell group. The multiple voltage acquisition units are connected one-to-one with each cell in the cell group. The multiple voltage acquisition units acquire the voltage of different cells respectively. The multiple voltage acquisition units are all used to be electrically connected to the battery manager to ensure that the voltage data of each cell can be accurately acquired.

[0033] Furthermore, to avoid a single first voltage circuit failure leading to a loss of power supply, such as Figure 3As shown, the at least one first voltage circuit 10 may include a first sub-voltage circuit 101 and a second sub-voltage circuit 102. The switch control module includes a relay. The first sub-voltage circuit 101 includes a first relay 1010, a first voltage acquisition module 1011 and a first battery cell group 1013. The second sub-voltage circuit 102 includes a second relay 1021, a second voltage acquisition module 1022 and a second battery cell group 1023. The first connection terminal of the first relay is connected to the cell plate at one end of the first cell group via the first wiring harness. The second connection terminal of the first relay serves as one end of the voltage output terminal of the first sub-voltage circuit. The second wiring harness led out from the cell plate at the other end of the first cell group serves as the other end of the voltage output terminal of the first sub-voltage circuit. The first connection terminal of the second relay is connected to the cell plate at one end of the second cell group via the third wiring harness. The second connection terminal of the second relay serves as one end of the voltage output terminal of the second sub-voltage circuit. The fourth wiring harness leading out from the cell plate at the other end of the second cell group serves as the other end of the voltage output terminal of the second sub-voltage circuit. The voltage output terminals of both the first and second sub-voltage circuits are used to electrically connect to the battery cooling system to achieve multiple low-voltage power supply backups and ensure the reliability of the cooling system power supply.

[0034] If a thermal runaway warning signal is received, the battery manager acquires the voltage of each cell in the first cell group acquired by the first voltage acquisition module, determines whether the voltage of each cell in the first cell group is abnormal, and if there is a cell with abnormal voltage, acquires the voltage of each cell in the second cell group acquired by the second voltage acquisition module, determines whether the voltage of each cell in the second cell group is abnormal, and if all are normal, sends a control signal to the second relay to control the connection between the first connection terminal and the second connection terminal, so as to control the connection of the second low-voltage sub-circuit.

[0035] The battery manager is also designed to take no action if no thermal runaway warning signal is received.

[0036] Of course, as another alternative embodiment, the battery module may also include three or more first voltage circuits.

[0037] Generally, if multiple cells in a battery pack experience thermal runaway, it indicates that thermal diffusion has occurred within the pack. At this point, activating the cooling cycle will not be able to suppress the thermal runaway of the entire pack. Therefore, setting up 2 to 3 primary voltage circuits (low-voltage circuits) is sufficient.

[0038] As an optional embodiment, the battery module may further include a temperature acquisition unit electrically connected to the battery manager, for acquiring temperature information of the cell module and sending it to the battery manager. The battery manager uses the temperature information to determine whether thermal runaway has occurred in the battery pack.

[0039] Secondly, based on the same inventive concept, the embodiments of the present invention provide a vehicle power battery system, such as... Figure 3 As shown, the power supply system includes the battery module as described in any of the first aspects above, and further includes: The second voltage circuit 20 includes a power supply switch 201 and a battery cell module 202. The positive terminal of the battery cell module 202 is connected to one end of the power supply switch 201, and the other end of the power supply switch 201 is used to connect to the positive terminal of the target electrical appliance 203. The negative terminal of the battery cell module 202 is used to connect to the negative terminal of the target electrical appliance 203. The battery cooling system is connected to the voltage output terminal of the first voltage circuit in the battery module; The battery manager, electrically connected to the power supply switch, is used to send a disconnect signal to the power supply switch to control the power supply switch to disconnect if a thermal runaway warning signal is received; it is also used to send a control signal to the switch control module to control the connection between the first connection terminal and the second connection terminal to control the connection of the first voltage circuit.

[0040] In a specific embodiment, the positive terminal of the battery cell module in the second voltage circuit is connected to one end of the power supply switch, the other end of the power supply switch is used to connect to the positive terminal of the target electrical appliance, and the negative terminal of the battery cell module is used to connect to the negative terminal of the target electrical appliance. The second voltage circuit is the vehicle's conventional high-voltage power supply circuit, which provides high-voltage electrical energy to the target electrical appliance under normal operating conditions.

[0041] The battery cooling system is connected to the voltage output terminal of the first voltage circuit in the battery module, receives low-voltage electrical energy provided by the first voltage circuit, drives components such as water pumps to operate, and realizes heat dissipation and cooling of the battery module.

[0042] The battery manager is electrically connected to the power switch and the switch control module. Upon receiving a thermal runaway warning signal, it sends a disconnect signal to the power switch, causing it to disconnect and cut off the high-voltage power supply to the second voltage circuit, thus preventing secondary risks from the high-voltage system. After cutting off the high-voltage power supply, it sends a control signal to the switch control module to connect the first and second connection terminals, thus connecting the first voltage circuit and supplying power to the battery cooling system.

[0043] In a specific embodiment, each first voltage circuit in the battery module further includes a voltage acquisition module, which is electrically connected to the battery manager and is used to acquire the voltage of each cell in the cell group. The battery manager is used to acquire the voltage of each cell in the cell group acquired by the voltage acquisition module, and to determine whether the voltage of each cell in the cell group is abnormal. If all are normal, it sends a control signal to the switch control module to control the connection between the first connection terminal and the second connection terminal, so as to control the connection of the first voltage circuit.

[0044] In a specific embodiment, the battery manager can also be used to acquire the voltage of each cell in the cell group collected by the voltage acquisition module, and determine whether the voltage of each cell is abnormal (the judgment standard is whether the cell voltage is between 2.0V and 4.3V, which is the voltage range for normal cell operation). If the voltage of each cell in the cell group is normal, a connection control signal is sent to the corresponding switch control module; if there is a cell with abnormal voltage, the first voltage circuit is not connected.

[0045] When the battery module includes a first sub-voltage circuit and a second sub-voltage circuit, the battery manager first acquires the voltage of each cell in the first cell group acquired by the first voltage acquisition module to determine if there is any abnormality. If there is a cell with abnormal voltage, the manager acquires the voltage of each cell in the second cell group acquired by the second voltage acquisition module to determine if the voltage of the second cell group is normal. If the voltage of the second cell group is normal, the manager sends a connection control signal to the second relay to control the second sub-voltage circuit to be connected and supply power to the battery cooling system.

[0046] For a detailed schematic diagram, please refer to... Figure 3 and Figure 4 Under normal conditions, the battery pack can supply power to the outside world. At this time, the battery manager controls the switching control modules in each of the first voltage circuits to disconnect, and the first voltage circuits do not supply power to the outside world. Once thermal runaway occurs, the battery manager receives a thermal runaway warning signal and quickly cuts off the high-voltage power to the second voltage circuit (high-voltage circuit). At this time, the voltage acquisition unit in the first voltage circuit starts working, and the battery manager acquires the voltage of the cells in the circuit. If the voltage of each cell in the first voltage circuit is detected to be between 2.0V and 4.3V, it is considered that the voltage in that circuit is normal and can supply power to the outside world. At this time, the switching control module in the first voltage circuit is closed, allowing the first voltage circuit to supply power to the outside world and drive the cooling system water pump. If the voltage of one or more cells in the first voltage circuit is detected to be outside the range of 2.0V and 4.3V, it is considered that at least one cell in the first voltage circuit may be in a state of thermal runaway. At this time, the first voltage circuit is not closed and does not supply power to the outside world. Subsequently, the same operation is performed on the second voltage circuit as on the first voltage circuit until the power battery cooling cycle is activated. The entire thermal runaway suppression process can be found in [reference needed]. Figure 5 .

[0047] If the battery manager does not receive a thermal runaway warning signal, the power supply switch in the second voltage circuit will be in the normal closed state, and the cell module will be supplied with high voltage.

[0048] This system avoids the problem of the battery pack being unable to supply power when the battery cell experiences thermal runaway under high voltage, while maximizing the operating time of the cooling circulation system. This solution offers at least the following advantages: 1. Power can still be supplied under high voltage during battery cell thermal runaway without introducing new risks of arcing and short-circuit failure; 2. When the vehicle power supply fails, the low-voltage power provided by the battery pack ensures the circulating water pump of the power battery remains operational to cool the battery, effectively improving the safety of the battery pack during thermal runaway; 3. Compared to systems without a first voltage circuit, this structure extends the operating time of the cooling circulation system's water pump, enabling longer-term battery cooling and effectively extending the power supply time, further enhancing the safety of the battery pack.

[0049] In summary, the vehicle power battery system provided by the embodiments of the present invention can quickly supply power through the first voltage circuit to start the water pump circulation when battery thermal runaway occurs, and extend the water pump start time as much as possible, thereby improving the reliability of the battery thermal management system and enhancing vehicle safety.

[0050] Thirdly, based on the same inventive concept, this embodiment provides a vehicle power battery control method, specifically including the battery manager in the vehicle power battery system described in any of the second aspects above, such as... Figure 6 As shown, the method includes the following steps S101 to S102: Step S101: If a thermal runaway warning signal is received, a disconnect signal is sent to the power supply switch to control the power supply switch to disconnect. Step S102: Send a control signal to the switch control module to control the connection between the first connection terminal and the second connection terminal, so as to control the connection of the first voltage circuit.

[0051] As an optional embodiment, before sending the control signal to the switch control module to connect the first connection terminal and the second connection terminal, the method may further include: acquiring the voltage of each cell in the cell group acquired by the voltage acquisition module, determining whether the voltage of each cell in the cell group is abnormal, and if all are normal, sending the control signal to the switch control module to connect the first connection terminal and the second connection terminal.

[0052] As an example, determining whether the voltage of each cell in the battery cell group is abnormal, and if all are normal, sending a control signal to the switch control module to connect the first connection terminal and the second connection terminal may include: determining whether the voltage of each cell in the battery cell group is between 2.0V and 4.3V, and if all are within this range, sending a control signal to the switch control module to connect the first connection terminal and the second connection terminal.

[0053] The vehicle power battery control method provided in this embodiment of the invention has the same implementation principle and technical effect as the aforementioned system embodiment. For the sake of brevity, any parts not mentioned in the method embodiment can be referred to the corresponding content in the aforementioned system embodiment.

[0054] Fourthly, based on the same inventive concept, this embodiment provides a vehicle 500, such as... Figure 7 As shown, it includes a vehicle body 502 and a vehicle power battery system 501 as described in any of the second aspects above.

[0055] Since the vehicle power battery system included in the embodiments of this invention has been described above, those skilled in the art can understand the specific structure and operating principle of the vehicle based on the vehicle power battery system described in the embodiments of this invention, and will not be repeated here. All vehicles including the vehicle power battery system of the embodiments of this invention fall within the scope of protection of this invention.

[0056] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0057] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A module that specifies the function in one or more boxes.

[0058] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction modules implemented in a process. Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0059] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0060] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0061] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A battery module, characterized in that, include: A battery cell module comprises multiple battery cells connected in series. as well as At least one first voltage circuit, each first voltage circuit including a switch control module and a cell group, the cell group including at least two cells connected in series in the cell module, a first connection terminal of the switch control module being connected to a cell plate at one end of the cell group via a wire harness, a second connection terminal of the switch control module serving as one end of the voltage output terminal of the first voltage circuit, and another wire harness leading out from the cell plate at the other end of the cell group serving as the other end of the voltage output terminal, the supply voltage of the first voltage circuit being less than a set safety voltage; The control terminal of the switch control module is used to be electrically connected to the battery manager, and the voltage output terminal of the first voltage circuit is used to be electrically connected to the battery cooling system. The switch control module is used to control the connection and disconnection between the first connection terminal and the second connection terminal according to the control signal sent by the battery manager, so as to control the connection and disconnection of the first voltage circuit.

2. The battery module as described in claim 1, characterized in that, Each first voltage circuit further includes a voltage acquisition module, which is used to acquire the voltage of each cell in the cell group; The voltage acquisition module is used to be electrically connected to the battery manager, and the control signal sent by the battery manager is determined according to the voltage of each cell in the cell group acquired by the voltage acquisition module.

3. The battery module as described in claim 2, characterized in that, The at least one first voltage circuit includes a first sub-voltage circuit and a second sub-voltage circuit. The switch control module includes a relay. The first sub-voltage circuit includes a first relay, a first voltage acquisition module, and a first battery cell group. The second sub-voltage circuit includes a second relay, a second voltage acquisition module, and a second battery cell group. The first connection terminal of the first relay is connected to the cell plate at one end of the first cell group via the first wiring harness. The second connection terminal of the first relay serves as one end of the voltage output terminal of the first sub-voltage circuit. The second wiring harness led out from the cell plate at the other end of the first cell group serves as the other end of the voltage output terminal of the first sub-voltage circuit. The first connection terminal of the second relay is connected to the cell plate at one end of the second cell group via the third wiring harness. The second connection terminal of the second relay serves as one end of the voltage output terminal of the second sub-voltage circuit. The fourth wiring harness leading out from the cell plate at the other end of the second cell group serves as the other end of the voltage output terminal of the second sub-voltage circuit. The voltage output terminals of both the first and second sub-voltage circuits are used for electrical connection with the battery cooling system.

4. The battery module as described in claim 1, characterized in that, The battery pack consists of 4 to 8 battery cells connected in series.

5. A vehicle power battery system, characterized in that, The power supply system further includes the battery module as described in any one of claims 1 to 4, and further includes: The second voltage circuit includes a power supply switch and a battery cell module. The positive terminal of the battery cell module is connected to one end of the power supply switch, and the other end of the power supply switch is used to connect to the positive terminal of the target electrical appliance. The negative terminal of the battery cell module is used to connect to the negative terminal of the target electrical appliance. The battery cooling system is connected to the voltage output terminal of the first voltage circuit in the battery module; The battery manager, electrically connected to the power supply switch, is used to send a disconnect signal to the power supply switch to control the power supply switch to disconnect if a thermal runaway warning signal is received; it is also used to send a control signal to the switch control module to control the connection between the first connection terminal and the second connection terminal to control the connection of the first voltage circuit.

6. The vehicle power battery system as described in claim 5, characterized in that, Each first voltage circuit in the battery module also includes a voltage acquisition module, which is electrically connected to the battery manager and is used to acquire the voltage of each cell in the cell group. The battery manager is used to acquire the voltage of each cell in the cell group acquired by the voltage acquisition module, determine whether the voltage of each cell in the cell group is abnormal, and if all are normal, send a control signal to the switch control module to control the connection between the first connection terminal and the second connection terminal, so as to control the connection of the first voltage circuit.

7. The vehicle power battery system as described in claim 5, characterized in that, The battery module includes a first sub-voltage circuit and a second sub-voltage circuit. The first sub-voltage circuit includes a first relay, a first voltage acquisition module, and a first cell group. The second sub-voltage circuit includes a second relay, a second voltage acquisition module, and a second cell group. The battery manager is used to acquire the voltage of each cell in the first cell group acquired by the first voltage acquisition module, determine whether the voltage of each cell in the first cell group is abnormal, and if there is a cell with abnormal voltage, acquire the voltage of each cell in the second cell group acquired by the second voltage acquisition module, determine whether the voltage of each cell in the second cell group is abnormal, and if all are normal, send a control signal to the second relay to control the connection between the first connection terminal and the second connection terminal, so as to control the connection of the second low-voltage sub-circuit.

8. A method for controlling a vehicle's power battery, characterized in that, The method includes a battery manager in a vehicle power battery system as described in any one of claims 5 to 7, and comprises: If a thermal runaway warning signal is received, a disconnect signal is sent to the power supply switch to control the power supply switch to disconnect; A control signal is sent to the switch control module to connect the first connection terminal and the second connection terminal, thereby controlling the connection of the first voltage circuit.

9. The vehicle power battery control method as described in claim 8, characterized in that, Before sending the control signal to the switch control module to connect the first connection terminal and the second connection terminal, the method further includes: The voltage of each cell in the cell group is acquired by the voltage acquisition module. It is then determined whether the voltage of each cell in the cell group is abnormal. If all are normal, a control signal is sent to the switch control module to control the connection between the first connection terminal and the second connection terminal.

10. A vehicle, characterized in that, Includes the vehicle body and the vehicle power battery system as described in any one of claims 5 to 7.

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