Power battery system

Abstract

The utility model provides a power battery system. The power battery system comprises a master control box and a slave control box, the heating interface of the master control box is connected with the heating interface of the slave control box; the switching positive interface of the master control box is connected with the switching negative interface of the slave control box; a communication switching interface of the master control box is connected with a communication switching interface of the slave control box, and a whole vehicle communication interface of the master control box is connected with a vehicle-mounted system. The problem that the battery cell voltage detection error is large due to the fact that the wire harness of the slave control box is too long in a single-machine mode is avoided, the consistency of the voltage between the battery cells is guaranteed, the large single voltage difference is avoided, and the problem that according to an existing power battery system of an integrated structure, partial voltage is generated due to the fact that the distance between two battery packs is large, an acquisition wire is too long and a wire set is too large is solved. And the acquisition precision of the battery cell voltage in the power battery system is low.

Description

Technical Field

[0001] This application relates to the technical field of battery systems, and particularly to a power battery system. Background Art

[0002] With the rapid popularization of electric vehicles, consumers and automobile manufacturers have paid increasing attention to battery safety issues. The power battery is not only the main power source and core component of electric vehicles, but also the main technical barrier to their rapid development.

[0003] The electrical architecture of the current power battery system is generally an integrated architecture. The integrated architecture means that there are two battery packs in the power battery system, but only one BMS (Battery Management System) is located in the main control box, that is, the integrated machine integrates voltage and temperature acquisition and system management.

[0004] The inventor has found through research that in the power battery system with an integrated architecture, when the distance between the two battery packs is large, the length of the voltage acquisition line in one of the battery packs is necessarily too long, and the large wire group generates voltage division, thus affecting the acquisition accuracy of the cell voltage in the power battery system. Summary of the Utility Model

[0005] In view of this, this application provides a power battery system to solve the problem that in the existing power battery system with an integrated architecture, due to the large distance between the two battery packs, too long acquisition lines, and large wire groups generating voltage division, the acquisition accuracy of the cell voltage in the power battery system is low.

[0006] To achieve the above object, the embodiments of this application provide the following technical solutions:

[0007] This application discloses a power battery system, including: a main control box and a slave control box;

[0008] The heating interface of the main control box is connected to the heating interface of the slave control box;

[0009] The transfer positive interface of the main control box is connected to the transfer negative interface of the slave control box;

[0010] The communication transfer interface of the main control box is connected to the communication transfer interface of the slave control box, and the vehicle communication interface of the main control box is connected to the vehicle-mounted system.

[0011] Optionally, in the power battery system provided above, the heating interface of the main control box includes: a main control heating positive terminal interface and a main control heating negative terminal interface, and the heating interface of the slave control box includes: a slave control heating positive terminal interface and a slave control heating negative terminal interface;

[0012] The positive terminal interface of the main control heating is connected to the negative terminal interface of the slave control heating, and the negative terminal interface of the main control heating is connected to the positive terminal interface of the slave control heating.

[0013] Optionally, in the power battery system provided above, the main control box includes: a total negative relay, a pre-charge resistor, a pre-charge relay, a main heating film, a current sensor, a main battery pack, a BMS host, and a communication device;

[0014] One end of the total negative relay is respectively connected to one end of the pre-charge resistor and one end of the main heating film, and the connection points are respectively used as the positive terminal interface of the main control heating and the battery negative interface of the main control box. The battery negative interface is connected to the total battery negative; the other end of the main heating film is used as the negative terminal interface of the main control heating;

[0015] The other end of the total negative relay is respectively connected to one end of the current sensor and one end of the pre-charge relay. The other end of the pre-charge relay is connected to the other end of the pre-charge resistor. The other end of the current sensor is connected to the negative electrode of the main battery pack, and the positive electrode of the main battery pack is used as the transfer positive interface of the main control box;

[0016] The first end of the BMS host is used as the vehicle communication interface of the main control box, the second end of the BMS host is used as the communication transfer interface of the main control box, and the third end of the BMS host is connected to the communication device.

[0017] Optionally, in the power battery system provided above, the communication device is an antenna.

[0018] Optionally, in the power battery system provided above, the main battery pack includes a plurality of battery cells, and the battery cells are connected in series.

[0019] Optionally, in the power battery system provided above, the slave control box includes: a slave battery pack, a main fuse, a heating fuse, a main positive relay, a main negative relay, a heating control relay, a slave heating film, and a BMS slave;

[0020] The negative electrode of the slave battery pack is used as the transfer negative interface of the slave control box. The positive electrode of the slave battery pack is connected to one end of the main fuse. The other end of the main fuse is respectively connected to one end of the main positive relay, one end of the main negative relay, and one end of the heating fuse. The other end of the main positive relay is used as the discharge positive interface of the slave control box, and the other end of the main negative relay is used as the charge positive interface of the slave control box;

[0021] The other end of the heating fuse is connected to one end of the heating control relay; the other end of the heating control relay is connected to one end of the slave heating film, and the connection point serves as the positive interface for slave-controlled heating; the other end of the slave heating film serves as the positive interface for slave-controlled heating;

[0022] One end of the BMS slave unit serves as the communication transfer interface of the slave control box.

[0023] Optionally, in the power battery system provided above, the slave battery pack includes a plurality of battery cells, and the battery cells are connected in series with each other.

[0024] Optionally, in the power battery system provided above, both the master control box and the slave control box are powered by an external power supply.

[0025] Optionally, in the power battery system provided above, both the master control box and the slave control box are powered by an internal power supply.

[0026] Optionally, in the power battery system provided above, the BMS master unit in the master control box is further configured to generate a slave-controlled wake-up signal, and the slave-controlled wake-up signal is used to wake up the BMS slave unit in the slave control box.

[0027] The power battery system provided by this application includes: a master control box and a slave control box; the heating interface of the master control box is connected to the heating interface of the slave control box; the positive transfer interface of the master control box is connected to the negative transfer interface of the slave control box; the communication transfer interface of the master control box is connected to the communication transfer interface of the slave control box, and the vehicle communication interface of the master control box is connected to the vehicle-mounted system. Compared with the single-machine mode of the integrated architecture, the power battery system in this application adopts a master-slave dual-machine mode, which avoids the problem of large deviation in the detection of the battery cell voltage of the slave control box due to too long wiring harness in the single-machine mode, ensures the consistency of the voltages between the battery cells, avoids too large difference in the voltages of individual cells, and solves the problem of low acquisition accuracy of the battery cell voltages in the power battery system of the existing integrated architecture, which is caused by voltage division due to large distance between the two battery packs, too long acquisition lines, and too large wire groups. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0029] Figure 1 It is a schematic structural diagram of a power battery system provided by an embodiment of the present application;

[0030] Figure 2Circuit diagram of the main control box of a power battery system provided by an embodiment of the present application;

[0031] Figure 3 Circuit diagram of the slave control box of a power battery system provided by an embodiment of the present application;

[0032] Figure 4 Circuit diagram of a power battery system provided by an embodiment of the present application;

[0033] Figure 5 Flow chart of high-voltage power-on provided by an embodiment of the present application. Detailed implementation manners

[0034] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0035] In this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover a non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the element.

[0036] The present application provides a power battery system to solve the problem that in the existing integrated architecture power battery system, due to voltage division caused by a large distance between two battery packs, too long acquisition lines, and too large wire groups, the acquisition accuracy of the core voltage in the power battery system is low.

[0037] Please refer to Figure 1 , this power battery system mainly includes: a main control box and a slave control box;

[0038] The heating interface of the main control box is connected to the heating interface of the slave control box;

[0039] In some embodiments, as Figure 2 or Figure 4 shown, the heating interface of the main control box may include: a main control heating positive terminal interface and a main control heating negative terminal interface; as Figure 3Or Figure 4 As shown, the heating interfaces of the slave control box may include: a positive heating interface of the slave control and a negative heating interface of the slave control;

[0040] The positive main heating interface is connected to the negative heating interface of the slave control, and the negative main heating interface is connected to the positive heating interface of the slave control.

[0041] In practical applications, by connecting the positive main heating interface to the positive heating interface of the slave control and the negative main heating interface to the negative heating interface of the slave control, the main heating film in the main control box and the slave heating film in the slave control box can be heated simultaneously to jointly heat the battery pack that needs to be heated.

[0042] The transfer positive interface of the main control box is connected to the transfer negative interface of the slave control box;

[0043] In practical applications, the main battery pack in the main control box and the slave battery pack in the slave control box can be connected through the transfer positive interface and the transfer negative interface to achieve series connection between the two.

[0044] The communication transfer interface of the main control box is connected to the communication transfer interface of the slave control box, and the vehicle communication interface of the main control box is connected to the vehicle-mounted system.

[0045] In practical applications, the BMS host in the main control box and the BMS slave in the slave control box can be connected through the communication transfer interface to achieve communication interaction between the two.

[0046] Specifically, the interaction between the BMS host and the BMS slave can be an interaction implemented using an intranet, such as using CAN communication; of course, it is not limited to this, and it can also be determined according to the application environment and user requirements. This application does not make any limitations and is within the protection scope of this application.

[0047] It should be noted that the BMS host in the main control box can also be connected to the vehicle-mounted system through the vehicle communication interface to achieve communication interaction between the BMS host and the vehicle-mounted system.

[0048] In some embodiments, similarly as Figure 2 Or Figure 4 As shown, the main control box may include: a total negative relay, a pre-charge resistor, a pre-charge relay, a main heating film, a current sensor, a main battery pack, a BMS host, and a communication device;

[0049] One end of the total negative relay is respectively connected to one end of the pre-charge resistor and one end of the main heating film, and the connection points are respectively used as the positive main heating interface and the battery negative interface of the main control box. The battery negative interface is connected to the battery total negative; the other end of the main heating film is used as the negative main heating interface;

[0050] The other end of the total negative relay is respectively connected to one end of the current sensor and one end of the pre-charge relay. The other end of the pre-charge relay is connected to the other end of the pre-charge resistor. The other end of the current sensor is connected to the negative pole of the main battery pack, and the positive pole of the main battery pack serves as the transfer positive interface of the main control box.

[0051] The first end of the BMS host serves as the vehicle communication interface of the main control box. The second end of the BMS host serves as the communication transfer interface of the main control box. The third end of the BMS host is connected to the communication device.

[0052] Among them, the first end of the BMS host is the port for the BMS host to communicate with the vehicle-mounted system. The second end of the BMS host is the port for the BMS host to communicate with the slave control box. The third end of the BMS host is the port for the BMS host to connect to the communication device. Specifically, the communication device can be an external communication device such as an antenna or an internal communication device.

[0053] In practical applications, the communication device can be an antenna, that is Figure 2 or Figure 4 as shown; of course, it is not limited to this, and it can also be determined according to the application environment and user requirements. This application does not make specific limitations and is within the protection scope of this application.

[0054] It should be noted that in practice, the main battery pack can include multiple battery cells, and the battery cells are connected in series. Exemplarily, the main battery pack can include 12 battery cells, and the battery cells are connected in series; of course, it is not limited to this, and it can also be determined according to the application environment and user requirements. This application does not make specific limitations and is within the protection scope of this application.

[0055] It also should be noted that in practice, the total negative relay is mainly used to control the on-off of the connection between the main battery pack and the battery load, so as to realize whether the main battery pack is used to supply power to the battery load. The pre-charge relay is mainly used to control its own closing to charge the pre-charge resistor when the voltage difference between the front and rear ends of the pre-charge relay meets certain requirements, so as to protect the total negative relay from large current impact to the greatest extent. The current sensor is mainly used to detect the current in the loop where the main battery pack is located.

[0056] In some embodiments, similarly as Figure 3 or Figure 4 shown, the slave control box can include: a slave battery pack, a main fuse, a heating fuse, a main positive relay, a main negative relay, a heating control relay, a slave heating film, and a BMS slave.

[0057] From the negative electrode of the battery pack as the transfer negative interface of the slave control box, connect one end of the main fuse from the positive electrode of the battery pack. The other end of the main fuse is respectively connected to one end of the main positive relay, one end of the main negative relay, and one end of the heating fuse. The other end of the main positive relay serves as the discharge positive interface of the slave control box, and the other end of the main negative relay serves as the charging positive interface of the slave control box;

[0058] The other end of the heating fuse is connected to one end of the heating control relay; the other end of the heating control relay is connected to one end of the slave heating film, and the connection point serves as the slave control heating positive terminal interface; the other end of the slave heating film serves as the slave control heating positive terminal interface;

[0059] One end of the BMS slave serves as the communication transfer interface of the slave control box.

[0060] In practical applications, the slave battery pack may include multiple battery cells, and the battery cells are connected in series.

[0061] Exemplarily, the slave battery pack may include 12 battery cells, and the battery cells are connected in series; of course, it is not limited thereto, and it can also be determined according to the application environment and user requirements. The present application does not make specific limitations, and all are within the protection scope of the present application.

[0062] It should be noted that in practice, when the current in the loop where the slave battery pack in the slave control box is too large, the main fuse will automatically cut off to protect the safety of the power battery system. The main positive relay and the main negative relay are used to connect the loop where the slave battery pack is located to supply power to the vehicle load. When any one of them is stuck, the main loop can be cut off by disconnecting the other relay to ensure safety.

[0063] In practice, whether the heating fuse is connected to the working loop can be achieved by controlling the on / off of the heating control relay. Among them, when the heating control relay is in the off state, the heating fuse is not connected to the working loop; when the heating control relay is in the on state, the heating fuse is connected to the working loop.

[0064] In some embodiments, the master control box and the slave control box can be powered by an external power supply or an internal power supply; it can be determined according to the application environment and user requirements, and all are within the protection scope of the present application.

[0065] In a specific application, the wake-up of the BMS slave in the slave control box can be controlled by the BMS master in the master control box, that is, the BMS master in the master control box is also used to generate a slave wake-up signal, and the slave wake-up signal is used to wake up the BMS slave in the slave control box.

[0066] Since the wake-up of the BMS slave is controlled by the BMS master in the main control box, that is, the wake-up of the BMS slave is controlled by the BMS master, it can ensure the consistency of the RTC (Real Time Clock) timing inside the BMS master and the BMS slave. After the BMS master is woken up, it indirectly wakes up the BMS slave through a control signal; compared with the situation where both the BMS master and the BMS slave are woken up by external signals and the wake-up of the BMS slave is not controlled by the BMS master, it is easy to cause the clock signals of the BMS master and the BMS slave to be out of sync, resulting in the BMS reporting an uncertain fault during timed wake-up and affecting the execution of the timed wake-up function.

[0067] It should be noted that the power battery system provided by this application has a timed wake-up function for power, which can largely avoid the phenomenon of battery power loss after the whole vehicle has been parked for a long time. Under normal power supply conditions, even if the external wake-up signal disappears, when the preset wake-up duration is reached, the RTC chip inside the BMS master can wake up regularly, so as to implement the high-voltage power-on process without manual operation, supply direct current to the whole vehicle, and at the same time, it can also judge whether the battery needs to be charged by detecting the low-voltage power supply; when the voltage of the low-voltage power supply is lower than the set value, the BMS master can output a whole-vehicle direct-current output enable signal, and the whole-vehicle direct current starts to output to charge the battery; when certain conditions are met, the BMS master will automatically turn off the output of the whole-vehicle direct-current enable signal, so that the whole-vehicle direct current stops outputting, stops charging the battery, the BMS master executes the next high-voltage process, enters the sleep state, and waits for the next timed wake-up.

[0068] Among them, the low-voltage power supply refers to the power supply in the BMS master and the BMS slave. There are power supply voltage detection chips inside the BMS master and the BMS slave. When the voltage is lower than the preset value (for example, 6V), the software control strategy will report an abnormal fault of the low-voltage power supply.

[0069] Combined with Figure 5 , the specific high-voltage power-on process is as follows: when the BMS master and the BMS slave are in the non-working state, the BMS master is woken up by an external wake-up signal, and the BMS master wakes up the BMS slave; after being woken up, the BMS master enters self-check to judge whether there are faults in the main control box and the slave control box; if it is judged that there are no faults, the high-voltage power-on process can be executed to complete the high-voltage power-on; if it is judged that there are faults, high-voltage power-on is not allowed, and the system powers off and restarts.

[0070] Among them, the faults can include single-cell under-voltage faults, single-cell over-voltage faults, low-temperature faults, high-temperature faults, etc., which are determined according to the application environment and user requirements and are not limited in this application, and all are within the protection scope of this application. Specifically, the above-mentioned faults generally judge whether there are faults by judging whether the fault trigger value is reached.

[0071] Exemplarily, when the voltage of a single cell reaches 2.5V, a single-cell undervoltage fault can be determined.

[0072] It should also be noted that for the specific process of the high-voltage power-on procedure, reference can also be made to the prior art, and details will not be elaborated herein.

[0073] In practical applications, the BMS slave in the slave control box is mainly used to collect the cell temperature and cell voltage inside the slave control box, and transmit the collected data to the BMS master through the internal network, so as to achieve unified management of the cell state. In some embodiments, the cell temperature can be the temperature of a single cell, and the cell voltage can be the voltage of a single cell and the voltage of the battery pack.

[0074] Compared with the single-machine mode in the existing integrated architecture, the power battery system provided in this application adopts a master-slave dual-machine mode, which avoids the problem of large detection error of the cell voltage in the slave control box due to too long wiring harness in the single-machine mode, ensures the consistency between cells, and avoids large differences in single-cell voltage.

[0075] It should be noted that in practice, the BMS master can achieve real-time monitoring and abnormal alarm of the cell temperature according to the temperature of a single cell, and report the maximum and minimum temperature data, which is convenient for users to understand the battery temperature status. The BMS master can perform real-time voltage monitoring and abnormal alarm according to the voltage of a single cell and the total voltage of the battery pack, and report the voltage data, which is convenient for users to understand the battery voltage status. The BMS master can also execute control strategies, and realize the switching between charge and discharge states by controlling the on and off of the main positive relay, main negative relay and heating control relay.

[0076] Specifically, when a discharge wake-up signal is detected, the main positive relay (i.e., the discharge relay) is closed to enter the normal discharge state; when heating is required, the heating control relay can be closed to enter the state of discharging while heating; when a charge wake-up signal is detected, the main negative relay (i.e., the charge relay) is closed to enter the normal charge state. Further, when heating is required, it can also be determined to enter the pure heating state or the state of charging while heating according to the cell temperature.

[0077] It should also be noted that the process of the BMS host collecting the temperature of individual cells can be as follows: temperature sensors are provided on the battery pack collection harness, and the temperature sensors are welded to the cells, and the temperature of the cells can be collected through the temperature sensors; the BMS slave uses the same method to collect the temperature of individual cells and transmits the collected data to the BMS host. The process of the BMS host collecting the voltage of individual cells and the total voltage of the battery pack is as follows: metal nickel sheets on the battery pack collection harness are welded to the cells to detect the voltage of individual cells in real time; the total voltage of the battery pack is obtained by installing a high-voltage detection point at the rear end of the main positive relay and detecting the voltage between this point and the battery total negative; the BMS slave uses the same method to collect the voltage of individual cells and the total voltage of the battery pack and transmits the collected data to the BMS host.

[0078] In summary, the power battery system provided by the embodiments of the present application includes: a main control box and a slave control box; the heating interface of the main control box is connected to the heating interface of the slave control box; the transfer positive interface of the main control box is connected to the transfer negative interface of the slave control box; the communication transfer interface of the main control box is connected to the communication transfer interface of the slave control box, and the vehicle communication interface of the main control box is connected to the vehicle-mounted system. Compared with the single-machine mode of the integrated architecture, the power battery system in the present application adopts a master-slave dual-machine mode. The BMS slave is responsible for collecting the voltage and temperature of individual cells in the slave control box and transmitting them to the BMS host through CAN communication, shortening the length of the voltage collection harness in the slave control box, improving the collection accuracy, avoiding the problem of large detection error of the cell voltage in the slave control box due to too long harness in the single-machine mode, ensuring the consistency of the voltage between cells, avoiding too large individual voltage difference, and solving the problem of low collection accuracy of the cell voltage in the power battery system of the existing integrated architecture due to voltage division caused by large distance between two battery packs, too long collection line, and too large wire group.

[0079] The features described in each embodiment of this specification can be replaced or combined with each other. For the same or similar parts between the embodiments, reference can be made to each other. Each embodiment focuses on the differences from other embodiments. In particular, for a system or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and reference can be made to the corresponding part of the method embodiment for the relevant content. The system and system embodiments described above are only illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative work.

[0080] Those skilled in the art may further realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described according to functions in the above description. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of this application.

[0081] The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use this application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A power battery system, characterized in that: include: Master control box and slave control box; The heating interface of the master control box is connected to the heating interface of the slave control box; The transfer positive interface of the master control box is connected to the transfer negative interface of the slave control box; The communication adapter interface of the master control box is connected to the communication adapter interface of the slave control box, and the vehicle communication interface of the master control box is connected to the vehicle system.

2. The power battery system according to claim 1, characterized in that: The heating interface of the master control box includes: a master control heating positive terminal interface and a master control heating negative terminal interface, and the heating interface of the slave control box includes: a slave control heating positive terminal interface and a slave control heating negative terminal interface; The master control heating positive terminal interface is connected to the slave control heating negative terminal interface, and the master control heating negative terminal interface is connected to the slave control heating positive terminal interface.

3. The power battery system according to claim 2, characterized in that: The main control box includes: a total negative relay, a pre-charging resistor, a pre-charging relay, a main heating film, a current sensor, a main battery pack, a BMS host and a communication device; One end of the total negative relay is respectively connected to one end of the pre-charging resistor and one end of the main heating film, and the connection points are respectively used as the main control heating positive terminal interface and the battery negative interface of the main control box, and the battery negative interface is connected to the total negative of the battery; the other end of the main heating film is used as the main control heating negative terminal interface; The other end of the total negative relay is respectively connected to one end of the current sensor and one end of the pre-charging relay, the other end of the pre-charging relay is connected to the other end of the pre-charging resistor, the other end of the current sensor is connected to the negative electrode of the main battery pack, and the positive electrode of the main battery pack serves as the transfer positive interface of the main control box; The first end of the BMS host serves as the vehicle communication interface of the main control box, the second end of the BMS host serves as the communication adapter interface of the main control box, and the third end of the BMS host is connected to the communication device.

4. The power battery system according to claim 3, characterized in that: The communication device is an antenna.

5. The power battery system according to claim 3, characterized in that: The main battery pack includes a plurality of battery cells, and each of the battery cells is connected in series.

6. The power battery system according to claim 2, characterized in that: The slave control box includes: a slave battery pack, a master fuse, a heating fuse, a master positive relay, a master negative relay, a heating control relay, a slave heating film and a BMS slave; The negative electrode of the slave battery pack serves as the negative transfer interface of the slave control box, the positive electrode of the slave battery pack is connected to one end of the master fuse, the other end of the master fuse is respectively connected to one end of the master positive relay, one end of the master negative relay and one end of the heating fuse, the other end of the master positive relay serves as the positive discharge interface of the slave control box, and the other end of the master negative relay serves as the positive charging interface of the slave control box; The other end of the heating fuse is connected to one end of the heating control relay; the other end of the heating control relay is connected to one end of the slave heating film, and the connection point serves as the slave control heating positive terminal interface; the other end of the slave heating film serves as the slave control heating positive terminal interface; One end of the BMS slave serves as a communication adapter interface of the slave control box.

7. The power battery system according to claim 6, characterized in that: The secondary battery pack includes a plurality of battery cells, and each of the battery cells is connected in series.

8. The power battery system according to any one of claims 1 to 7, characterized in that: The main control box and the slave control box are both powered by an external power supply.

9. The power battery system according to any one of claims 1 to 7, characterized in that: The master control box and the slave control box are both powered by an internal power supply.

10. The power battery system according to any one of claims 1 to 7, characterized in that: The BMS host in the master control box is also used to generate a slave control wake-up signal, and the slave control wake-up signal is used to wake up the BMS slave in the slave control box.

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