High-voltage battery module and control method therefor

Abstract

The present application provides a high-voltage battery module and a control method therefor. The high-voltage battery module comprises a plurality of battery cells and a plurality of intelligent battery management systems corresponding to the battery cells; the intelligent battery management systems are electrically connected to a high-voltage direct-current bus and the corresponding battery cells, respectively; every two adjacent intelligent battery management systems are in communication connection; the intelligent battery management systems each comprise a control unit and at least one power conversion unit; and each power conversion unit is connected to the corresponding battery cell, the high-voltage direct-current bus, and the corresponding control unit, respectively. By implementing the scheme of the present application, each single battery cell is subjected to voltage conversion by means of the corresponding power conversion unit and then is connected to the high-voltage direct-current bus, and there are no direct series and parallel connection relationships between the battery cells, thereby reducing the battery state estimation complexity, effectively prolonging the service life of a battery module, and improving the safety of the battery module.

Description

A high-voltage battery module and a control method thereof Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a high-voltage battery module and a control method thereof. Background Art

[0002] In energy storage and electric vehicle applications, whether low-power, low-voltage battery packs or high-power, high-voltage energy storage batteries or power batteries, they are all achieved by connecting low-voltage cells (commonly in the 2.5V to 3.8V range) in series and parallel. The higher the voltage, the lower the system current, and the higher the overall efficiency. Therefore, the voltage of energy storage and power battery packs released in recent years has become increasingly higher.

[0003] The cycle life of a single battery cell can reach thousands to tens of thousands of times, but after the cells are connected in series and parallel to form battery groups, battery packs, and battery clusters, the degree of aging of the cells varies over time due to the differences in the environments in which the different cells are located. The cell with the highest degree of aging among the series-connected cells determines the maximum capacity of the entire battery pack and is the weak link of the entire battery pack. The voltage difference between parallel battery packs generates circulation and additional heat loss, which will eventually cause a significant drop in battery capacity or even thermal failure due to problems with a very small number of cells. Technical issues

[0004] The main purpose of this application is to provide a high-voltage battery module and a control method thereof, aiming to solve the problem of the impact of direct series connection of single battery cells on the capacity of the entire battery pack, and the problem of low safety caused by circulating current when used in parallel. Technical Solutions

[0005] To achieve the above-mentioned objectives, the first aspect of the present application provides a high-voltage battery module, comprising: multiple battery cells and multiple intelligent battery management systems corresponding to the battery cells, the intelligent battery management systems are electrically connected to the high-voltage DC bus and the corresponding battery cells, respectively, and two adjacent intelligent battery management systems are communicatively connected, the intelligent battery management system includes a control unit and at least one power conversion unit, the power conversion unit is respectively connected to the corresponding battery cell, the high-voltage DC bus and the control unit; the control unit is used to generate a corresponding drive control signal according to the control information obtained by the communication protocol, and output it to the corresponding power conversion unit; wherein the control information includes a target bus side voltage value, a target bus side current value, a target battery cell voltage value and a target battery cell current value; the power conversion unit is used to adjust the battery cell voltage, battery cell current, bus voltage and bus current according to the drive control signal.

[0006] The second aspect of the present application provides a high-voltage battery module control method, which is applied to the high-voltage battery module as described in the first aspect, including: an interface module obtains control information through a communication protocol and transmits the control information to a battery state of charge estimation module; wherein the control information includes a target bus side voltage value, a target bus side current value, a target cell voltage value and a target cell current value; when the battery state of charge estimation module receives the control information and detection signal transmitted by the interface module, it generates a corresponding control instruction and transmits it to a DC conversion controller; the DC conversion controller generates a drive control signal according to the received control instruction and transmits it to a power conversion unit; the power conversion unit adjusts the bus voltage, bus current, and the voltage and current of the corresponding battery cell to the corresponding target values ​​according to the drive control signal. Beneficial effects

[0007] From the above description, it can be seen that each single cell in the high-voltage battery module in the present application is connected to the high-voltage DC bus after voltage conversion by the power conversion unit. There is no direct series and parallel relationship between the cells. Therefore, compared with using the battery module directly in series with the cells, the capacity of the entire battery module will not be significantly affected by the decrease in the capacity of a single cell, that is, the life of the battery module can be infinitely close to the cycle life of a single cell; and compared with the battery module using the cells in parallel, there is no current circulation caused by the difference in battery parameters, thereby effectively improving the safety of the battery module; in addition, the parameter estimation of multiple cells in series and parallel is simplified to the parameter estimation of a single cell, which greatly reduces the complexity, can effectively reduce the difficulty of estimation, and improve the estimation accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0009] FIG1 is a schematic structural diagram of a first high-voltage battery module according to an embodiment of the present application;

[0010] FIG2 is a schematic structural diagram of a second high-voltage battery module according to an embodiment of the present application;

[0011] FIG3 is a schematic structural diagram of a first intelligent battery management system according to an embodiment of the present application;

[0012] FIG4 is a schematic structural diagram of a second intelligent battery management system according to an embodiment of the present application;

[0013] FIG5 is a schematic diagram of a basic flow chart of a high-voltage battery module control method according to an embodiment of the present application. Modes for Carrying Out the Invention

[0014] In order to make the purpose, features, and advantages of the invention of this application more obvious and easy to understand, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of this application.

[0015] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of this application, the meaning of "plurality" is two or more, unless otherwise clearly specified.

[0016] In the related art, single cells are directly used in series, and changes in the capacity of the single cells will significantly affect the capacity of the entire battery pack. When connected in parallel, it may cause circulation problems and have low safety. For this reason, an embodiment of the present application provides a high-voltage battery module.

[0017] As shown in Figures 1 and 2, respectively, a schematic diagram of the structure of a first high-voltage battery module and a schematic diagram of the structure of a second high-voltage battery module are provided in the embodiments of the present application. The high-voltage battery module includes: a plurality of battery cells and a plurality of intelligent battery management systems corresponding to the battery cells. The intelligent battery management systems are electrically connected to the high-voltage DC bus and the corresponding battery cells, respectively. Two adjacent intelligent battery management systems are communicatively connected. The intelligent battery management system includes a control unit and at least one power conversion unit. The power conversion unit is connected to the corresponding battery cell, the high-voltage DC bus and the control unit, respectively. The control unit is used to generate a corresponding drive control signal according to the control information obtained by the communication protocol and output it to the corresponding power conversion unit; wherein the control information includes a target bus side voltage value, a target bus side current value, a target battery cell voltage value and a target battery cell current value; the power conversion unit is used to adjust the battery cell voltage, battery cell current, bus voltage and bus current according to the drive control signal.

[0018] Specifically, this embodiment provides an intelligent high-voltage battery module, which integrates a new intelligent battery management system (Intelligent Battery Management System, IBMS). Multiple IBMS units are connected by communication lines and exchange information through a communication protocol. The IBMS unit includes a power conversion unit and a control unit. The control unit can obtain control information according to the communication protocol and generate corresponding drive control signals according to the control information to drive the corresponding power conversion unit to adjust the DC bus voltage, current and battery cell voltage and current. Therefore, each battery cell is connected to the high-voltage DC bus through the corresponding power conversion unit. There is no series and parallel relationship between the battery cells. Compared with using the battery module directly in series, the capacity of the entire battery module will not be significantly affected by the decrease in the capacity of a single battery cell, that is, the life of the battery module can be infinitely close to the cycle life of a single battery cell. Compared with the battery module using the battery cells in parallel, there is no current circulation caused by differences in battery parameters, thereby effectively improving the safety of the battery module. Among them, each battery cell can be managed and controlled by a separate intelligent battery management system. For example, as shown in Figure 1, N battery cells correspond to one intelligent battery management system respectively; or they can share an intelligent battery management system with other battery cells. For example, as shown in Figure 2, n battery cells in the mth battery cell group all share one intelligent battery management system m; thus, the high-voltage battery module architecture provided by this embodiment can greatly improve the life of the battery module on the basis of naturally formed active balancing, and effectively solve the problem of accelerated low-capacity electrical aging in traditional battery module active balancing solutions.

[0019] It should be noted that there are two types of balancing technologies for battery modules: passive balancing and active balancing. In passive balancing technology, the cells in the battery module are directly connected in series, and switches and power resistors are connected in parallel to each cell. When the power is unbalanced, the energy of the cells with more power is released, which increases the loss and heat generation of the battery module, and also reduces the overall capacity of the system. In addition, this passive balancing technology can only solve the problem of unbalanced charging, but cannot solve the problem of unbalanced discharge. Therefore, the balancing effect is relatively poor. In active balancing technology, the basic principle of achieving battery balancing is to adjust the cell voltage through an intermediate energy storage or conversion device. The biggest controversy of this solution is that batteries with smaller capacity have more charge and discharge times, which will accelerate their aging. There are two main types of active battery balancing technologies: the switching network method and the independent power supply method. In the switch network method, the battery cells that need to be discharged or charged are connected to the energy storage power supply unit through a switch network. The switch network is relatively complex and will reduce reliability. Battery cells with relatively small capacity need to complete multiple charge and discharge operations in one charge and discharge cycle, further accelerating aging. For the independent power supply method, each battery cell needs to be equipped with an independent balancing power supply. During discharge, if the corresponding battery cell voltage is low, the corresponding power supply is selected through the switch network to replenish power for the battery cell. During charging, if the corresponding battery cell voltage is high and the balancing power supply is designed as a bidirectional power supply, the battery cell can be discharged. In order to ensure the accuracy of the replenishment voltage, the independent power supply has relatively high voltage accuracy requirements. Therefore, in order to achieve battery charge and discharge balance, the battery cell with a relatively high degree of aging will still be charged and discharged multiple times in one charge and discharge cycle, further accelerating its aging.

[0020] As shown in Figure 3, this is a structural diagram of the first intelligent battery management system provided in this embodiment. Please refer to Figure 3. The power conversion unit includes a low-voltage rectifier inverter unit and a high-voltage rectifier inverter unit. The first end of the low-voltage rectifier inverter unit is electrically connected to the battery cell, and the second end is electrically connected to the first end of the high-voltage rectifier inverter unit. The second end of the high-voltage rectifier inverter unit is electrically connected to the high-voltage DC bus. The third ends of the low-voltage rectifier inverter unit and the high-voltage rectifier inverter unit are both electrically connected to the control unit.

[0021] Specifically, the power conversion unit in this embodiment is a high-ratio DC / DC power conversion unit, which is responsible for completing the changes in the cell voltage and the bus voltage. It should be noted that many problems in battery applications are caused by the series and parallel connection between the cells. Since the voltage of a single cell is very low, in order to meet the needs of energy storage and power applications, it is necessary to boost the voltage to above 400V and the DC / DC voltage conversion ratio to above 100. Efficient conversion cannot be achieved using traditional devices and topologies. However, with the emergence and mature application of third-generation semiconductor devices, breakthroughs have been made in new magnetic materials and magnetic device design methods, and the efficiency of high-ratio DC / DC conversion can reach more than 98%. In the future, with the advancement of technology, the conversion efficiency is expected to be further improved, making the direct application of single cells possible. In this embodiment, the high-transformation-ratio DC / DC power conversion unit can convert the low voltage, such as 3.2V, of the battery cell to high voltage through the low-voltage rectifier inverter unit and the high-voltage rectifier inverter unit when charging; the input end of the power conversion unit is connected to the battery cell, and the output end is connected to the DC high-voltage bus. In addition, the power conversion unit is also connected to the control unit to receive the drive control signal transmitted by the control unit.

[0022] Furthermore, as shown in FIG4 , which is a structural diagram of a second intelligent battery management system provided in this embodiment, the intelligent battery management system includes multiple power conversion units, and all power conversion units are electrically connected to the high-voltage DC bus after being connected in series.

[0023] In this embodiment, when multiple battery cells share one intelligent battery management system, the intelligent battery management system correspondingly sets up multiple corresponding power conversion units. In this case, the output ends of each power conversion unit are first connected in series and then connected to the high-voltage DC bus; when the battery cell uses a single intelligent battery management system, the output end of each power conversion unit is directly connected to the high-voltage DC bus.

[0024] Furthermore, referring to FIG. 3 , the power conversion unit further includes an isolation transformer, which is electrically connected between the low-voltage rectifier inverter unit and the high-voltage rectifier inverter unit.

[0025] Specifically, in this embodiment, the power conversion unit can also adopt an isolated topology with a high-frequency transformer. The electrical isolation provided by the transformer can increase the safety distance and enhance security. However, when a non-isolated topology is adopted, the lack of electrical isolation can improve conversion efficiency to a certain extent. Therefore, the power conversion unit can choose to use a topology with electrical isolation or a non-isolated topology based on actual needs.

[0026] Furthermore, please refer to Figure 3. The control unit includes a DC conversion controller, a protection module, a battery state of charge estimation module and an interface module. The DC conversion controller, interface module, protection module and battery state of charge estimation module are all integrated inside the control unit. Information is transmitted and interacted between the modules through a control protocol. The interface modules of two adjacent control units are communicatively connected.

[0027] Specifically, in this embodiment, the DC / DC converter controller (DC / DC controller) mainly performs functions such as power flow control, loop calculation, and drive wave generation; the protection module can monitor operating information such as voltage, current, temperature, insulation resistance, alarm information, control information, etc. on components such as battery cells, power conversion units, DC buses, and data buses in real time, and perform corresponding protection functions based on built-in algorithms; the battery state of charge (SOC) estimation module mainly implements the online monitoring function of the battery status, predicts the remaining capacity of the battery through parameter identification and online reconstruction, and based on this, further obtains common parameters such as SOP (state of charge) and SOH (state of health); the interface module mainly implements information exchange functions with the outside world, and the interaction types include collision signal detection, AC / DC charging, charger status detection, thermal status detection, heating / cooling requirements, pre-charging, wake-up / sleep, and communication with the vehicle control unit (VCU).

[0028] From the above description, it can be seen that in the high-voltage battery module of the embodiment of the present application, each single cell is connected to the high-voltage DC bus after voltage conversion by the power conversion unit. There is no direct series or parallel relationship between the cells. Therefore, compared with the direct series connection of the cells, the capacity of the entire battery module will not be significantly affected by the decrease in the capacity of a single cell, that is, the life of the battery module can be infinitely close to the cycle life of a single cell. Compared with the battery module using the cells in parallel, there is no current circulation caused by differences in battery parameters, thereby effectively improving the safety of the battery module. Moreover, because the battery is isolated by the BMS unit, battery modules of most specifications, materials, and capacities can be used together, making battery expansion, cascade utilization and other applications easier to implement. At the same time, the DC / DC power conversion unit and the control unit are integrated and share the same DC / DC controller, so that the BMS unit can directly manage the battery. Moreover, each cell can be individually controlled as needed, and the control strategy is more flexible and efficient.

[0029] The present application also provides a high-voltage battery module control method, which is applied to the above-mentioned high-voltage battery module. As shown in Figure 5, a basic flow chart of a high-voltage battery module control method provided by the present application is shown. As shown in Figure 5, the high-voltage battery module control method includes:

[0030] Step 501: The interface module obtains control information through a communication protocol and transmits the control information to a battery state of charge estimation module.

[0031] Specifically, in this embodiment, the interface module of the control unit in the intelligent battery management system is connected to the external terminal device and other intelligent battery management systems through a communication line, and can receive control information sent by the external device or component through the communication protocol. The control information is external demand information such as the target bus side voltage value, the target bus side current value, the target cell voltage and the target cell current value; and then the control information is transmitted to the corresponding module. For example, when the bus voltage, current, cell voltage and current need to be adjusted, the corresponding control information is transmitted to the battery state of charge estimation module.

[0032] Step 502: When the battery state of charge estimation module receives the control information transmitted by the interface module, it generates a corresponding control instruction and transmits it to the DC conversion controller.

[0033] Specifically, in this embodiment, when the battery state of charge estimation module receives control information, it will generate corresponding control instructions based on the built-in preset algorithm and transmit them to the DC conversion controller; in addition, when the battery state of charge estimation module receives a detection signal, it can also generate a corresponding detection control instruction. The detection signal can come from relevant devices inside the intelligent battery management system, such as an interface module or other signal generator.

[0034] Step 503: The DC conversion controller generates a drive control signal according to the received control instruction and transmits the signal to the power conversion unit;

[0035] Step 504 : The power conversion unit adjusts the bus voltage, bus current, and the voltage and current of the corresponding battery cell to corresponding target values ​​according to the driving control signal.

[0036] Specifically, in this embodiment, when the DC converter controller receives a control instruction, it can run a closed-loop control program based on the control instruction and related detection data to generate corresponding drive control signals, such as Vd1 and Vd2 in Figure 3, and transmit the drive control signals Vd1 and Vd2 to the power conversion unit. After receiving the drive control signals Vd1 and Vd2, the power conversion unit will adjust the bus voltage Vp and current Ip and the battery cell charge and discharge voltage Vb and current Ib to meet external requirements.

[0037] Furthermore, in some implementations of this embodiment, the high-voltage battery module control method also includes: the interface module generates corresponding signal acquisition instructions based on the control information, and transmits the signal acquisition instructions to the DC conversion controller through the battery state of charge estimation module; the battery state of charge estimation module determines the characteristic parameters of the battery cell based on the battery cell operation information feedback from the DC conversion controller, and uploads the characteristic parameters to the interface module; wherein the characteristic parameters include charge state parameters, power state parameters, and health state parameters.

[0038] Specifically, in this embodiment, the interface module will also generate corresponding signal acquisition instructions based on external demand information, that is, control information, to control the DC conversion controller to sample the signal of the power conversion unit to obtain the operating information of the battery cell. The battery state of charge estimation module can further obtain the characteristic parameters of the battery cell such as the state of charge parameter SOC, the power state parameter SOP, the health state parameter SOH and other common parameters through the battery cell operating information fed back by the DC conversion controller, and upload them to the interface module.

[0039] Furthermore, in some implementations of this embodiment, after the battery state of charge estimation module determines the characteristic parameters of the battery cell based on the battery cell operation information fed back by the DC conversion controller, it also includes: the battery state of charge estimation module compares each characteristic parameter with the corresponding preset threshold value; when there is an abnormal characteristic parameter in the characteristic parameter that reaches the corresponding threshold value, the battery state of charge estimation module generates a protection instruction and transmits it to the protection module.

[0040] Specifically, in this embodiment, after determining the characteristic parameters of the battery cell, the battery state of charge estimation module will also compare each type of characteristic parameters with the corresponding threshold value. When there are abnormal characteristic parameters whose characteristic parameters reach the corresponding threshold value, it is determined that there is an abnormality in the system, and a protection instruction is sent to the protection module to control the protection module to perform the protection function.

[0041] Furthermore, in some other implementations of this embodiment, the high-voltage battery module control method also includes: when the protection module receives a protection instruction transmitted by the interface module, or detects that the high-voltage battery module is in an abnormal state, it generates a protection control instruction and transmits it to the DC conversion controller; the DC conversion controller outputs a corresponding drive control signal according to the protection control instruction.

[0042] Specifically, in this embodiment, the protection module can generate corresponding protection control instructions based on protection instructions sent by internal devices or external devices, or when it detects that the high-voltage battery module is in an abnormal state, and transmit them to the instruction conversion controller to enter the control power conversion module to adjust the battery cell and bus voltage and current.

[0043] Furthermore, in some other implementations of this embodiment, the high-voltage battery module control method also includes: the interface module receives feedback information uploaded by the battery state of charge estimation module, the DC conversion controller and the protection module and transmits it to the terminal device; wherein the feedback information includes battery cell operation information, battery cell characteristic parameter information, and abnormal protection information.

[0044] Specifically, in this embodiment, the interface module can be used to interact with external devices. It can obtain the demand signal of the external device through the communication protocol, generate the corresponding instruction control system to perform the corresponding function, and also upload the feedback information of internal devices such as the battery state of charge estimation module, the DC conversion controller and the protection module to the external device according to external demand. Among them, the DC conversion controller obtains the battery cell operation information by sampling the power conversion unit; the battery state of charge estimation module can estimate the battery cell characteristic parameters such as SOH, SOC, and SOP based on the battery cell operation information; the protection module can generate corresponding abnormal protection information based on the protection instructions sent within the system.

[0045] Based on the technical solution of the above-mentioned embodiment of the present application, the interface module obtains control information through the communication protocol and transmits the control information to the battery state of charge estimation module. When the battery state of charge estimation module receives the control information transmitted by the interface module, it generates a corresponding control instruction and transmits it to the DC conversion controller; the DC conversion controller generates a drive control signal based on the received control instruction and transmits it to the power conversion unit; the power conversion unit adjusts the bus voltage and the cell voltage of the corresponding battery cell to the corresponding target voltage value based on the drive control signal. The power conversion unit is integrated with the control unit, and the power conversion unit and the control unit share the same DC conversion controller, which truly realizes direct intelligent management of the battery cells. Each battery cell can be individually controlled as needed, and the control strategy is more flexible and efficient.

[0046] It should be noted that the various embodiments in the present application are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.

[0047] It should also be noted that, in the present application, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0048] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure is not limited to the embodiments shown herein but is intended to be applied in the broadest manner consistent with the principles and novel features disclosed herein.

Claims

1. A high voltage battery module, characterized in that: include: A plurality of battery cells and a plurality of intelligent battery management systems corresponding to the battery cells, wherein the intelligent battery management systems are electrically connected to the high-voltage DC bus and the corresponding battery cells respectively, and two adjacent intelligent battery management systems are communicatively connected to each other, and the intelligent battery management system comprises a control unit and at least one power conversion unit, wherein the power conversion unit is connected to the corresponding battery cells, the high-voltage DC bus and the control unit respectively; The control unit is used to generate a corresponding drive control signal according to the control information obtained by the communication protocol, and output it to the corresponding power conversion unit; wherein the control information includes a target bus side voltage value, a target bus side current value, a target cell voltage value and a target cell current value; The power conversion unit is used to adjust the cell voltage, cell current, bus voltage and bus current according to the control signal.

2. The high-voltage battery module according to claim 1, characterized in that: The power conversion unit includes a low-voltage rectifier and inverter unit and a high-voltage rectifier and inverter unit. The first end of the low-voltage rectifier and inverter unit is electrically connected to the battery cell, the second end is electrically connected to the first end of the high-voltage rectifier and inverter unit, the second end of the high-voltage rectifier and inverter unit is electrically connected to the high-voltage DC bus, and the third ends of the low-voltage rectifier and inverter unit and the high-voltage rectifier and inverter unit are both electrically connected to the control unit.

3. The high-voltage battery module according to claim 1, characterized in that: The control unit includes a DC conversion controller, a protection module, a battery state of charge estimation module and an interface module. The DC conversion controller, the interface module, the protection module and the battery state of charge estimation module are all integrated inside the control unit, and information is transmitted and interacted between the modules through a control protocol.

4. The high-voltage battery module according to claim 1, characterized in that: The intelligent battery management system includes a plurality of power conversion units, and all the power conversion units are connected in series and electrically connected to the high-voltage DC bus.

5. The high-voltage battery module according to claim 2, characterized in that: The power conversion unit further includes an isolation transformer, which is electrically connected between the low-voltage rectifier and inverter unit and the high-voltage rectifier and inverter unit.

6. A high-voltage battery module control method, applied to the high-voltage battery module according to any one of claims 1 to 5, characterized in that: include: The interface module obtains control information through a communication protocol and transmits the control information to the battery state of charge estimation module; wherein the control information includes a target bus side voltage value, a target bus side current value, a target cell voltage value, and a target cell current value; When the battery state of charge estimation module receives the control information transmitted by the interface module, it generates a corresponding control instruction and transmits it to the DC conversion controller; The DC conversion controller generates a drive control signal according to the received control instruction and transmits the signal to the power conversion unit; The power conversion unit adjusts the bus voltage, bus current, voltage and current of the corresponding battery cell to corresponding target values ​​according to the driving control signal.

7. The high-voltage battery module control method according to claim 6, characterized in that: Also includes: The interface module generates a corresponding signal acquisition instruction according to the control information, and transmits the signal acquisition instruction to the DC conversion controller through the battery state of charge estimation module; The battery state of charge estimation module determines the characteristic parameters of the battery cell according to the battery cell operation information fed back by the DC conversion controller, and uploads the characteristic parameters to the interface module; wherein the characteristic parameters include charge state parameters, power state parameters, and health state parameters.

8. The high-voltage battery module control method according to claim 6, characterized in that: Also includes: When the protection module receives the protection instruction transmitted by the interface module or detects that the high-voltage battery module is in an abnormal state, it generates a protection control instruction and transmits it to the DC conversion controller; The DC conversion controller outputs a corresponding drive control signal according to the protection control instruction.

9. The high-voltage battery module control method according to claim 7, characterized in that: After the step of determining the characteristic parameters of the battery cell according to the battery cell operation information fed back by the DC conversion controller, the battery state of charge estimation module further includes: The battery state of charge estimation module compares each of the characteristic parameters with the corresponding preset threshold value; When there is an abnormal characteristic parameter among the characteristic parameters that reaches the corresponding threshold, the battery state of charge estimation module generates a protection instruction and transmits it to the protection module.

10. The high-voltage battery module control method according to claim 9, characterized in that: Also includes: The interface module receives feedback information uploaded by the battery state of charge estimation module, the DC conversion controller and the protection module and transmits it to the terminal device; wherein the feedback information includes battery cell operation information, battery cell characteristic parameter information and abnormal protection information.

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