Battery module multi-parallel and multi-serial management system and management method thereof

Abstract

The invention discloses a multi-parallel and multi-serial management system for battery modules and a management method thereof, and belongs to the technical field of batteries. Comprising a first battery module, a second battery module... and an Nth battery module, each battery module comprises a battery shell, and an electric quantity display is arranged on the outer surface of the battery shell; the electronic circuit board is provided with an electronic circuit structure, and the electronic circuit structure comprises a main processor unit, and a CAN communication unit, a 485 communication unit, a UART communication unit and a weak current switch unit which are respectively connected with the main processor unit. The battery modules are sequentially connected in parallel or in series through the positive electrode interfaces and the negative electrode interfaces; the CAN communication unit of each battery module is connected to the same CAN communication bus; by operating the function switch or the weak current switch unit on the electric quantity display, other battery modules connected through the CAN communication bus are synchronously controlled, so that all the battery modules can be synchronously operated, and the problem of non-uniform electric quantity is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of batteries, and in particular relates to a management system for multiple parallel and multiple series of battery modules and a management method thereof. Background Art

[0002] In the field of battery technology, lead-acid batteries, as a long-standing energy storage device, have long occupied an important position in a variety of application scenarios due to their low production cost. However, with the continuous advancement of science and technology and the enhancement of environmental awareness, the limitations of lead-acid batteries have gradually emerged. The primary problem is that the service life is relatively short, and because it contains heavy metal lead, if it is not handled properly, it will pose a serious pollution threat to the environment. In addition, if the hydrogen and oxygen produced by lead-acid batteries during the charging process are not properly managed, it may also cause safety hazards such as explosions. More importantly, in terms of energy storage efficiency, lead-acid batteries lag significantly behind emerging technologies, especially at the same weight, lithium batteries can store more energy and provide longer driving range for vehicles such as electric vehicles, thus meeting the market's urgent demand for efficient and long-range energy storage solutions.

[0003] In view of the above shortcomings, lithium batteries have gradually become the new favorite of the market. Their high energy density, long cycle life, low self-discharge rate and environmental protection have made them widely used in many fields such as electronic products, electric vehicles, medical equipment, etc. However, the widespread use of lithium batteries is also accompanied by new challenges, especially in safety management. When lithium batteries encounter abnormal conditions such as excessive current or power loss, it is easy to cause safety problems and may even burn the entire device. To meet these challenges, high-end lithium batteries are usually equipped with a control board (also called a safety board), which is used to prevent lithium batteries from experiencing excessive current; and is designed with a low-voltage forced start function to provide emergency start support when the battery is low, ensuring that the equipment can return safely or reach the maintenance point.

[0004] Nevertheless, the application of lithium batteries in complex systems, especially in the configuration of multiple parallel and multiple strings of battery modules, still faces many technical difficulties. Traditional battery management systems (BMS) often rely on wired methods such as CAN communication or 485 communication to connect each battery module to the host computer, and then control the synchronous operation of each battery module through the host computer, but this architecture has obvious deficiencies in dealing with synchronous operation and power balance between battery modules. In particular, when the power of each battery module is uneven, the low-power module will be exhausted first, causing the remaining modules to bear excessive current, thereby increasing safety risks. As in the prior art, the Chinese patent with publication number CN101882689A discloses a voltage-stabilized hybrid battery pack and its charging management system, including a battery pack composed of several lithium batteries connected in series, each lithium battery is connected in parallel with one or more of the same voltage lead-acid batteries, nickel-cadmium batteries, nickel-hydrogen batteries or other batteries whose voltage does not increase after being fully charged, together forming a voltage-stabilized hybrid single battery.

[0005] In the above-mentioned prior art, both ends of each voltage-stabilized hybrid single cell are connected to a controller, and a charging power source is connected to the controller and the voltage-stabilized hybrid battery pack respectively; after the voltage-stabilized hybrid battery pack starts working, the controller transmits the status of each single cell to the upper computer to facilitate the management of the voltage-stabilized hybrid battery pack. Therefore, the above-mentioned prior art also controls the controller through the upper computer, and then controls each single cell through the controller.

[0006] In addition, the existing battery modules lack an effective communication mechanism between the same level of battery modules after being connected in parallel and in series, making the management of battery shutdown, startup and other synchronous operations complicated and difficult to control, leading to uneven power. Another possibility is that when some battery modules are not started synchronously, it is easy to cause the battery modules that have been turned on to have insufficient load capacity, further exacerbating the problem of uneven power.

[0007] Therefore, there is an urgent need for a management system and a management method for multiple parallel and multiple series battery modules to achieve power balance and safe synchronous operation among the battery modules, thereby comprehensively improving the overall performance and safety of the battery. Summary of the invention

[0008] In response to the problems in the related art, the present invention proposes a management system for multiple parallel and multiple strings of battery modules and a management method thereof to overcome the above-mentioned technical problems existing in the existing related art. In the present invention, after issuing an instruction, any one of the N battery modules can directly and synchronously control all other battery modules connected to it through the CAN communication bus without relying on a host computer for transit control, which greatly improves the response speed and autonomy of the system and reduces the risk of control failure caused by host computer failure or communication delay, thereby ensuring that all battery modules can operate synchronously and avoiding the problem of uneven power.

[0009] The technical solution of the present invention is implemented as follows: a management system for multiple parallel and multiple series battery modules, comprising a first battery module, a second battery module, ..., an Nth battery module, wherein N is a positive integer greater than 1;

[0010] Each of the battery modules comprises a battery shell, the outer surface of which is provided with a power display, and the power display is provided with a plurality of function switches; the inner cavity of the battery shell is provided with a battery pack with an electronic circuit board, the battery pack is formed by stacking single cells in series or in parallel, and is connected to the electronic circuit board through a conductor; an electronic circuit structure is provided on the electronic circuit board; the electronic circuit structure comprises a main processor unit, and a CAN communication unit, a 485 communication unit, a UART communication unit and a weak current switch unit respectively connected to the main processor unit, and also comprises a battery positive electrode P+ and a battery negative electrode P-; a positive electrode interface connected to the battery positive electrode P+, ​​and a negative electrode interface connected to the battery negative electrode P- are also provided on the outer surface of the battery shell;

[0011] Each of the battery modules is connected in parallel or in series in sequence through the positive electrode interface and the negative electrode interface; the CAN communication unit of each of the battery modules is connected to the same CAN communication bus, and the communication data is transmitted on the CAN communication bus in a broadcasting manner; each of the battery modules is connected to a host computer through the CAN communication bus; the host computer is used to monitor and operate the operating status, change parameters, firmware update and function control of the N battery modules;

[0012] By operating the function switch on the power display or the weak current switch unit, other battery modules connected through the CAN communication bus are synchronously controlled;

[0013] In the same battery module, the electronic circuit structure is also connected to the power display through the 485 communication unit or the UART communication unit.

[0014] Furthermore, after the function switch on the power display is turned on, the power display sends a first signal to the main processor unit through the 485 communication unit or the UART communication unit; or the weak current switch unit is turned on, and the weak current switch unit sends a second signal directly to the main processor unit; when the main processor unit receives the first signal or the second signal, the main processor unit synchronously controls other battery modules connected through the CAN communication bus through the CAN communication unit.

[0015] Furthermore, when each of the battery modules is connected in series in sequence, the negative electrode interface of the first battery module is connected to the positive electrode interface of the second battery module, the negative electrode interface of the second battery module is connected to the positive electrode interface of the third battery module... and so on, the negative electrode interface of the N-1th battery module is connected to the positive electrode interface of the Nth battery module; the positive electrode interface of the first battery module is used to connect to the positive electrode of the load or charger, and the negative electrode interface of the Nth battery module is used to connect to the negative electrode of the load or charger.

[0016] Furthermore, when the battery modules are connected in parallel in sequence, the positive electrode interfaces of the battery modules are connected to the same wire, and the negative electrode interfaces of the battery modules are connected to another wire;

[0017] It should be noted that the positive electrode interface of the first battery module is used to connect to the positive electrode of a load or a charger, and the negative electrode interface of the Nth battery module is used to connect to the negative electrode of a load or a charger.

[0018] Further, the power display includes a power display light, a charging indicator light, an alarm indicator light, a protection indicator light, a power display switch, a low-voltage forced start switch, a discharge indicator light and a power switch, and the power display light, the charging indicator light, the alarm indicator light, the protection indicator light, the power display switch, the low-voltage forced start switch, the discharge indicator light, and the power switch are all connected to the main processor unit through the 485 communication unit or the UART communication unit;

[0019] Wherein, the UART communication unit is compatible with Bluetooth or display screen communication.

[0020] Further, the main processor unit includes pins CAN_TXD, CAN_RXD, TX1, RX1, TX3, RX3, TX2, RX2 and MCU_DI1; wherein the pins CAN_TXD and CAN_RXD are respectively connected to the CAN communication unit; the pins TX1 and RX1 are respectively connected to the 485 communication unit; the pins TX3, RX3, TX2 and RX2 are respectively connected to the UART communication unit; the pin MCU_DI1 is connected to the weak current switch unit.

[0021] Furthermore, the electronic circuit structure also includes a parallel current limiting module, the leg GPIO1 of the main processor unit is connected to the parallel current limiting module, and the parallel current limiting module is connected to the negative electrode P- of the battery.

[0022] Furthermore, the CAN communication unit and the CAN communication bus adopt the CAN communication protocol, and the 485 communication unit adopts the 485 communication protocol.

[0023] A management method for multiple parallel and multiple strings of battery modules is applied to the above-mentioned management system for multiple parallel and multiple strings of battery modules, and the management method comprises the following steps:

[0024] Step 1: Each of the battery modules is connected to a parallel current limiting module to avoid large current shock when connected in parallel, thereby realizing parallel connection of different amounts of battery modules, or realizing parallel connection of new and old batteries between the battery modules;

[0025] Step 2: connecting each of the battery modules in parallel or in series in sequence through the positive electrode interface and the negative electrode interface;

[0026] Step 3: The main processor unit of each battery module is connected to the power display through the 485 communication unit or the UART communication unit; the synchronous operation of all battery modules is achieved by operating the function switch of any battery module;

[0027] Step 4: Connect the CAN communication units of the battery modules to the same CAN communication bus; after the battery modules are connected through the CAN communication unit, start the shutdown function of one of the battery modules, and the other battery modules can enter shutdown mode; then connect the positive / negative interfaces of all the battery modules in series, and then start the startup function of one of the battery modules, and the other battery modules can enter startup mode, and then connect the load and the charger to work normally;

[0028] Step 5: Each of the battery modules is connected to the host computer via the CAN communication bus for monitoring.

[0029] Furthermore, in the step 4, the communication data is transmitted on the CAN communication bus in a broadcasting manner, an identifier is pre-set on the communication data, and each of the battery modules decides whether to receive and process the communication data according to the received identifier;

[0030] Furthermore, the communication data includes a first identifier and a second identifier; it is set that when the first identifier is received, the battery module is required to receive and process the communication data; when the second identifier is received, the battery module is required not to receive the communication data.

[0031] Beneficial effects of the present invention:

[0032] (1) First, the present invention integrates multiple communication modes such as CAN communication, 485 communication and UART communication, thereby improving the compatibility of the system and the reliability of data transmission, and meeting the communication requirements in different application scenarios; moreover, the host computer can also realize the monitoring, operation, parameter change, firmware update and function control of all battery modules, thereby improving the maintainability and management efficiency of the system.

[0033] (2) Secondly, in the present invention, after issuing a command, any one of the N battery modules can directly control all other battery modules connected to it through the CAN communication bus synchronously, without relying on the host computer for transit control. This decentralized control method greatly improves the response speed and autonomy of the system, reduces the risk of control failure caused by host computer failure or communication delay, and ensures that all battery modules can operate synchronously. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic structural diagram of each battery module of the present invention;

[0035] Figure 2 is a circuit schematic diagram of the electronic circuit structure of the present invention;

[0036] Figure 3 It is a structural schematic diagram of the battery modules of the present invention connected in series;

[0037] Figure 4 It is a structural schematic diagram of the battery modules of the present invention connected in series and connected to a host computer;

[0038] Figure 5 This is a schematic diagram of the structure of the battery modules of the present invention connected in parallel;

[0039] Figure 6 It is a structural schematic diagram of the battery modules of the present invention being connected in parallel and connected to a host computer;

[0040] Figure 7 for Figure 6 A magnified view of point A.

[0041] Marking Description:

[0042] 1. Battery shell; 11. Positive electrode interface; 12. Negative electrode interface; 2. Battery indicator; 21. Battery indicator light; 22. Charging indicator light; 23. Alarm indicator light; 24. Protection indicator light; 25. Battery display switch; 26. Low-voltage forced start switch; 27. Discharge indicator light; 28. Power switch; 3. CAN communication unit. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0045] like Figure 1-7 As shown, this embodiment provides a management system for multiple parallel and multiple series of battery modules, including a first battery module, a second battery module, ..., an Nth battery module, where N is a positive integer greater than 1;

[0046] Each of the battery modules comprises a battery shell 1, the outer surface of the battery shell 1 is provided with a power display 2, and the power display 2 is provided with a plurality of function switches; the inner cavity of the battery shell 1 is provided with a battery pack with an electronic circuit board, and the battery pack is formed by stacking single cells in series or in parallel, and is connected to the electronic circuit board through a conductor; an electronic circuit structure is provided on the electronic circuit board; the electronic circuit structure comprises a main processor unit, and a CAN communication unit 3, a 485 communication unit, a UART communication unit and a weak current switch unit respectively connected to the main processor unit, and also comprises a battery positive electrode P+ and a battery negative electrode P-; a positive electrode interface 11 connected to the battery positive electrode P+, ​​and a negative electrode interface 12 connected to the battery negative electrode P- are also provided on the outer surface of the battery shell 1;

[0047] Each of the battery modules is connected in parallel or in series in sequence through the positive electrode interface 11 and the negative electrode interface 12; the CAN communication unit 3 of each of the battery modules is connected to the same CAN communication bus, and the communication data is transmitted on the CAN communication bus in a broadcast manner; each of the battery modules is connected to a host computer through the CAN communication bus; the host computer is used to monitor and operate the operating status, change parameters, firmware update and function control of the N battery modules;

[0048] By operating the function switch on the power display 2 or the weak current switch unit, other battery modules connected through the CAN communication bus are synchronously controlled;

[0049] In the same battery module, the electronic circuit structure is also connected to the power display 2 through the 485 communication unit or the UART communication unit.

[0050] First, this embodiment integrates multiple communication methods such as CAN communication, 485 communication and UART communication, which improves the compatibility of the system and the reliability of data transmission and meets the communication requirements in different application scenarios; moreover, it can also monitor, operate, change parameters, update firmware and control functions of all battery modules through the host computer, thereby improving the maintainability and management efficiency of the system.

[0051] Secondly, the significant advantage of the multi-parallel and multi-string battery module management system described in this embodiment is decentralized control, that is, after issuing a command, any one of the N battery modules can directly control all other battery modules connected to it through the CAN communication bus synchronously without relying on the host computer for transit control. This decentralized control method greatly improves the response speed and autonomy of the system and reduces the risk of control failure caused by host computer failure or communication delay.

[0052] At the same time, when it is necessary to uniformly adjust the working status of the battery pack (such as charging, discharging, protection mode switching, etc.), you only need to operate the function switch or low-voltage switch unit on any battery module to achieve synchronous response of the entire battery pack, thereby improving the overall collaborative work efficiency of the system.

[0053] In the traditional battery management mode, it may be necessary to set the working parameters of each battery module one by one through the host computer, which is cumbersome and error-prone. However, the autonomous synchronous control function of the multi-parallel and multi-string battery module management system described in this embodiment allows the user to complete the control of the entire battery pack by operating only one battery module, greatly simplifying the operation process and reducing the difficulty of operation.

[0054] Specifically, after the function switch on the power display 2 is turned on, the power display 2 sends the first signal to the main processor unit through the 485 communication unit or the UART communication unit; or the weak current switch unit is turned on, and the weak current switch unit sends the second signal directly to the main processor unit; when the main processor unit receives the first signal or the second signal, the main processor unit synchronously controls other battery modules connected through the CAN communication bus through the CAN communication unit 3.

[0055] Specifically, when each of the battery modules are connected in series in sequence, the negative electrode interface of the first battery module is connected to the positive electrode interface of the second battery module, the negative electrode interface of the second battery module is connected to the positive electrode interface of the third battery module... and so on, the negative electrode interface of the N-1th battery module is connected to the positive electrode interface of the Nth battery module; the positive electrode interface of the first battery module is used to connect to the positive electrode of the load or charger, and the negative electrode interface of the Nth battery module is used to connect to the negative electrode of the load or charger.

[0056] Specifically, when the battery modules are connected in parallel, the positive electrode interfaces of the battery modules are connected to the same wire, and the negative electrode interfaces of the battery modules are connected to another wire;

[0057] It should be noted that the positive electrode interface of the first battery module is used to connect to the positive electrode of a load or a charger, and the negative electrode interface of the Nth battery module is used to connect to the negative electrode of a load or a charger.

[0058] Specifically, the power display 2 includes a power display light 21, a charging indicator light 22, an alarm indicator light 23, a protection indicator light 24, a power display switch 25, a low-voltage forced start switch 26, a discharge indicator light 27 and a power switch 28. The power display light 21, the charging indicator light 22, the alarm indicator light 23, the protection indicator light 24, the power display switch 25, the low-voltage forced start switch 26, the discharge indicator light 27, and the power switch 28 are all connected to the main processor unit through the 485 communication unit or the UART communication unit;

[0059] Wherein, the UART communication unit is compatible with Bluetooth or display screen communication;

[0060] In this embodiment, the power indicator light 21 can directly reflect the current power status of the corresponding battery module, and the user can quickly understand the remaining battery power without complicated calculations or relying on other devices; the charging indicator light 22 can clearly indicate whether the battery module is in a charging state to avoid user misoperation or overcharging; the alarm indicator light 23 can alarm in time when the battery module is abnormal (such as overcharging, overdischarging, short circuit, etc.), reminding the user to pay attention and take corresponding measures; the protection indicator light 24 can display whether the protection mechanism of the battery module has been activated to ensure the safety of the battery and the system;

[0061] Moreover, the settings of the power display switch 25, the low voltage forced start switch 26, the power switch 28, etc. allow the user to manually control the display state, start conditions and power on / off of the power display 2 as needed, thereby enhancing the interactivity between the user and the battery module and improving the user experience;

[0062] In addition, the functions of the power display 2 can be flexibly configured and expanded according to actual needs by communicating with the main processor unit through a 485 communication unit or a UART communication unit (compatible with Bluetooth or display screen communication).

[0063] Specifically, the main processor unit includes pins CAN_TXD, CAN_RXD, TX1, RX1, TX3, RX3, TX2, RX2 and MCU_DI1; wherein the pins CAN_TXD and CAN_RXD are respectively connected to the CAN communication unit 3; the pins TX1 and RX1 are respectively connected to the 485 communication unit; the pins TX3, RX3, TX2 and RX2 are respectively connected to the UART communication unit; the pin MCU_DI1 is connected to the weak current switch unit.

[0064] Specifically, the electronic circuit structure further includes a parallel current limiting module, the leg GPIO1 of the main processor unit is connected to the parallel current limiting module, and the parallel current limiting module is connected to the negative electrode P- of the battery;

[0065] In this embodiment, after the battery modules are connected in parallel, when various abnormal large charging currents occur, this embodiment can directly enter the current limiting function by immediately starting the parallel current limiting module, thereby ensuring the safety of the battery modules and avoiding excessive current.

[0066] Specifically, the CAN communication unit 3 and the CAN communication bus adopt the CAN communication protocol, and the 485 communication unit adopts the 485 communication protocol;

[0067] In this embodiment, the CAN communication protocol supports broadcast communication, that is, data sent by one node can be received by all nodes on the bus, which is conducive to synchronous control of multiple nodes.

[0068] This embodiment further provides a management method for multiple parallel-connected battery modules, which is applied to the management system for multiple parallel-connected battery modules. The management method includes the following steps:

[0069] Step 1: Each of the battery modules is connected to a parallel current limiting module to avoid large current shock when connected in parallel, thereby realizing parallel connection of different amounts of battery modules, or realizing parallel connection of new and old batteries between the battery modules;

[0070] Step 2: Connecting each of the battery modules in parallel or in series in sequence through the positive electrode interface 11 and the negative electrode interface 12;

[0071] Step 3: The main processor unit of each battery module is connected to the power display 2 through the 485 communication unit or the UART communication unit; the synchronous operation of all battery modules is achieved by operating the function switch of any battery module;

[0072] Step 4: Connect the CAN communication units 3 of the battery modules to the same CAN communication bus; after the battery modules are connected via the CAN communication unit, start the shutdown function of one of the battery modules, and the other battery modules can enter shutdown mode; then connect the positive electrode interfaces 11 / negative electrode interfaces 12 of all the battery modules in series, and then start the startup function of one of the battery modules, and the other battery modules can enter startup mode, and then connect the load and the charger to work normally;

[0073] Step 5: Each of the battery modules is connected to the host computer via the CAN communication bus for monitoring.

[0074] Specifically, in the step 4, the communication data is transmitted on the CAN communication bus in a broadcasting manner, an identifier is pre-set on the communication data, and each battery module decides whether to receive and process the communication data according to the received identifier;

[0075] More specifically, the communication data includes a first identifier and a second identifier; it is set that when the first identifier is received, the battery module is required to receive and process the communication data; when the second identifier is received, the battery module is required not to receive the communication data.

[0076] In this embodiment, CAN communication can realize multiple working modes. In this way, each battery module can send control information to any other connected battery module, and other battery modules will perform related actions after receiving the information, so that this embodiment can realize functions such as synchronous charging, discharging, power on, power off, power display and low-voltage forced start through CAN communication.

[0077] Moreover, any battery module in this embodiment can be used as a main control module. When any button in the main control module is operated, the CAN communication protocol can control the synchronous operation of other battery modules. In actual use, the user only needs to operate the function switch of any battery module to control all battery modules connected to the battery module.

[0078] According to the disclosure and teaching of the above description, those skilled in the art to which the present invention belongs may also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the scope of protection of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the present invention.

Claims

1. A management system for multiple parallel and multiple series battery modules, characterized in that: comprising a first battery module, a second battery module, ..., an Nth battery module, wherein N is a positive integer greater than 1; Each of the battery modules comprises a battery shell, the outer surface of which is provided with a power display, and the power display is provided with a plurality of function switches; the inner cavity of the battery shell is provided with a battery pack with an electronic circuit board, the battery pack is formed by stacking single cells in series or in parallel, and is connected to the electronic circuit board through a conductor; an electronic circuit structure is provided on the electronic circuit board; the electronic circuit structure comprises a main processor unit, and a CAN communication unit, a 485 communication unit, a UART communication unit and a weak current switch unit respectively connected to the main processor unit, and also comprises a battery positive electrode P+ and a battery negative electrode P-; a positive electrode interface connected to the battery positive electrode P+, ​​and a negative electrode interface connected to the battery negative electrode P- are also provided on the outer surface of the battery shell; Each of the battery modules is connected in parallel or in series in sequence through the positive electrode interface and the negative electrode interface; the CAN communication unit of each of the battery modules is connected to the same CAN communication bus, and the communication data is transmitted on the CAN communication bus in a broadcast manner; each of the battery modules is connected to the host computer through the CAN communication bus; By operating the function switch on the power display or the weak current switch unit, other battery modules connected through the CAN communication bus are synchronously controlled; In the same battery module, the electronic circuit structure is also connected to the power display through the 485 communication unit or the UART communication unit.

2. A battery module multi-parallel multi-string management system according to claim 1, characterized in that: After the function switch on the power display is turned on, the power display sends the first signal to the main processor unit through the 485 communication unit or the UART communication unit; or the weak current switch unit is turned on, and the weak current switch unit sends the second signal directly to the main processor unit; when the main processor unit receives the first signal or the second signal, the main processor unit synchronously controls other battery modules connected through the CAN communication bus through the CAN communication unit.

3. A battery module multi-parallel multi-string management system according to claim 1, characterized in that: When the battery modules are connected in series in sequence, the negative electrode interface of the first battery module is connected to the positive electrode interface of the second battery module, the negative electrode interface of the second battery module is connected to the positive electrode interface of the third battery module... and so on, the negative electrode interface of the N-1th battery module is connected to the positive electrode interface of the Nth battery module; the positive electrode interface of the first battery module is used to connect to the positive electrode of the load or charger, and the negative electrode interface of the Nth battery module is used to connect to the negative electrode of the load or charger.

4. A battery module multi-parallel multi-string management system according to claim 1, characterized in that: When the battery modules are connected in parallel in sequence, the positive electrode interfaces of the battery modules are connected to the same wire, and the negative electrode interfaces of the battery modules are connected to another wire.

5. A battery module multi-parallel multi-string management system according to claim 1, characterized in that: The power display includes a power display light, a charging indicator light, an alarm indicator light, a protection indicator light, a power display switch, a low-voltage forced start switch, a discharge indicator light, and a power switch. The power display light, the charging indicator light, the alarm indicator light, the protection indicator light, the power display switch, the low-voltage forced start switch, the discharge indicator light, and the power switch are all connected to the main processor unit through the 485 communication unit or the UART communication unit; Wherein, the UART communication unit is compatible with Bluetooth or display screen communication.

6. A battery module multi-parallel multi-string management system according to claim 1, characterized in that: The main processor unit includes pins CAN_TXD, CAN_RXD, TX1, RX1, TX3, RX3, TX2, RX2 and MCU_DI1; wherein the pins CAN_TXD and CAN_RXD are respectively connected to the CAN communication unit; the pins TX1 and RX1 are respectively connected to the 485 communication unit; the pins TX3, RX3, TX2 and RX2 are respectively connected to the UART communication unit; the pin MCU_DI1 is connected to the weak current switch unit.

7. A battery module multi-parallel and multi-string management system according to claim 1, characterized in that: The electronic circuit structure further includes a parallel current limiting module, to which the leg GPIO1 of the main processor unit is connected, and the parallel current limiting module is connected to the negative electrode P- of the battery.

8. A battery module multi-parallel and multi-string management system according to claim 1, characterized in that: The CAN communication unit and the CAN communication bus adopt the CAN communication protocol, and the 485 communication unit adopts the 485 communication protocol.

9. A method for managing multiple parallel and multiple strings of battery modules, applied to a management system for multiple parallel and multiple strings of battery modules as claimed in any one of claims 1 to 8, characterized in that: The management method comprises the following steps: Step 1: Each of the battery modules is connected to a parallel current limiting module to avoid large current shock when connected in parallel, thereby realizing parallel connection of different amounts of battery modules, or realizing parallel connection of new and old batteries between the battery modules; Step 2: connecting each of the battery modules in parallel or in series in sequence through the positive electrode interface and the negative electrode interface; Step 3: The main processor unit of each battery module is connected to the power display through the 485 communication unit or the UART communication unit; the synchronous operation of all battery modules is achieved by operating the function switch of any battery module; Step 4: Connect the CAN communication units of the battery modules to the same CAN communication bus; after the battery modules are connected through the CAN communication unit, start the shutdown function of one of the battery modules, and the other battery modules can enter shutdown mode; then connect the positive / negative interfaces of all the battery modules in series, and then start the startup function of one of the battery modules, and the other battery modules can enter startup mode, and then connect the load and the charger to work normally; Step 5: Each of the battery modules is connected to the host computer via the CAN communication bus for monitoring.

10. A method for managing multiple parallel and multiple series of battery modules according to claim 9, characterized in that: In the step 4, the communication data is transmitted on the CAN communication bus in a broadcasting manner. An identifier is pre-set on the communication data, and each battery module decides whether to receive and process the communication data according to the received identifier.

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