Parallel discharge system and electric vehicle

Abstract

The embodiment of the utility model provides a parallel discharge system and an electric vehicle. The parallel discharge system comprises: a connecting device, which comprises at least two battery connecting modules, and each battery connecting module comprises a battery positive electrode port, a battery negative electrode port and at least one address allocation signal port; the positive electrode connecting structure is connected with the battery positive electrode port; the negative electrode connecting structure is connected with the battery negative electrode port; wherein the state of each address allocation signal port comprises: connecting or not connecting a cathode connection structure; the state combinations of the address allocation signal ports included in different battery connection modules are different; the motor controller and the at least two batteries are connected to the connecting device, and the batteries update battery addresses according to the state combination of the address allocation signal ports included in the inserted battery connecting module. According to the technical scheme provided by the embodiment of the invention, the speed of accessing the battery to the parallel discharge system is improved.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of battery management, and in particular to a parallel discharging system and an electric vehicle. BACKGROUND

[0002] With the continuous development of battery technology, multi-battery parallel discharging has become an important means to improve battery capacity and discharging time. For electrically driven vehicles, the performance and endurance time of the vehicle can be improved by the way of multi-battery parallel discharging.

[0003] In a multi-battery parallel discharging system, each battery needs to have a unique battery address, so that multiple batteries can work cooperatively, ensure the balanced distribution of discharging currents of different batteries, and improve the efficiency and stability of the parallel discharging system. However, in the existing parallel discharging system, the speed of battery access to the parallel discharging system is low.

[0004] In the above background, how to provide a technical solution to improve the speed of battery access to the parallel discharging system has become a technical problem to be solved by those skilled in the art. CONTENT OF THE UTILITY MODEL

[0005] To solve the above technical problems, embodiments of the present application provide a parallel discharging system and an electric vehicle.

[0006] In a first aspect, embodiments of the present application provide a parallel discharging system, comprising:

[0007] A connecting device, comprising: at least two battery connecting modules, each battery connecting module comprising a battery positive electrode port, a battery negative electrode port and at least one address allocation signal port; a positive electrode connecting structure connected to the battery positive electrode port; a negative electrode connecting structure connected to the battery negative electrode port; wherein the state of each address allocation signal port includes: connected or not connected to the negative electrode connecting structure; the state combination of the address allocation signal ports contained in different battery connecting modules is different;

[0008] A motor controller and at least two batteries connected to the connecting device, the batteries being plug-in connected to the battery connecting modules, wherein the battery updates the battery address according to the state combination of the address allocation signal ports contained in the inserted battery connecting module.

[0009] In a second aspect, embodiments of the present application provide an electric vehicle, comprising the parallel discharging system as described in the first aspect, and the electric vehicle is driven by the parallel discharging system.

[0010] The parallel discharge system provided by the embodiment of the application connects the motor controller and the at least two batteries through the connecting device, wherein the connecting device comprises at least two battery connecting modules, so as to connect the at least two batteries through the at least two battery connecting modules and supply power to the motor in the parallel state of the batteries; and since each battery connecting module comprises at least one address signal port, the state of each address signal port comprises a connected or unconnected negative electrode connecting structure, and the state combinations of the address allocation signal ports contained by different battery connecting modules are different from each other, so that when the battery is inserted into the battery connecting module, the battery can quickly update the battery address according to the state combination of the address allocation signal ports contained by the inserted battery connecting module, the complex battery address negotiation process among multiple batteries is avoided, the battery address updating efficiency of the parallel discharge system is improved, and the speed of connecting the battery to the parallel discharge system is improved. BRIEF DESCRIPTION OF DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of the provided drawings.

[0012] Figure 1 is a schematic diagram of a parallel discharge system provided by the embodiment of the present application.

[0013] Figure 2 is a schematic diagram of a connecting device in a parallel discharge system provided by the embodiment of the present application.

[0014] Figure 3 is a distribution table of address signals in a parallel discharge system provided by the embodiment of the present application.

[0015] Figure 4a is a port definition table of a battery connecting module in a parallel discharge system provided by the embodiment of the present application.

[0016] Figure 4b is a port definition table of a battery connecting module in a parallel discharge system provided by the embodiment of the present application. DETAILED DESCRIPTION

[0017] As described in the background, the battery access speed of the existing parallel discharge system needs to be improved. Now the reasons why the battery access speed of a parallel discharge system needs to be improved are analyzed.

[0018] Some existing batteries include a battery management system (BMS), which is used to manage the performance of the battery, monitor the state of the battery, and provide certain protection for the battery. In a multi-battery parallel system, the BMS system of the battery is also used to negotiate addresses with other batteries in the system when the battery is connected to a multi-battery parallel system, so as to avoid address conflicts.

[0019] In an existing parallel discharge system, the addresses of different batteries are negotiated through an address bus. However, the address negotiation through the address bus has the problem of low negotiation efficiency, which causes the newly inserted battery to be unable to quickly access the multi-battery parallel system.

[0020] It can be seen that the access speed of the battery of the existing parallel discharge system needs to be improved.

[0021] Therefore, the embodiment of the present application provides a parallel discharge connection device to improve the access speed of the battery.

[0022] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0023] Figure 1 is a schematic diagram of a parallel discharge system provided by the embodiment of the present application. Referring to Figure 1 , the parallel discharge system comprises a connection device 10.

[0024] The connection device 10 comprises: at least two battery connection modules 110, each of which comprises a battery positive electrode port, a battery negative electrode port, and at least one address allocation signal port; a positive electrode connection structure 101 connected to the battery positive electrode port; a negative electrode connection structure 102 connected to the battery negative electrode port; wherein the state of each address allocation signal port comprises: connection or non-connection of the negative electrode connection structure 101; and the state combination of the address allocation signal ports included in different battery connection modules is different.

[0025] Specifically, for any battery connection module, a battery can be inserted into the battery connection module, so that the battery positive electrode port in the battery connection module is used to connect the positive electrode of the battery, the battery negative electrode port is used to connect the negative electrode of the battery, and the at least one address allocation signal port in the battery connection module is used to allocate a battery address for the battery inserted into the battery connection module.

[0026] In the embodiments of the present application, for any battery connection module, the battery address of the battery inserted into the battery connection module is allocated based on the state combination of the at least one address allocation signal port included in the battery connection module; specifically, the state of any address allocation signal port is divided into connected to the negative connection structure (i.e. the address allocation signal port is connected to the negative connection structure) and not connected to the negative connection structure (i.e. the address allocation signal port is not connected to the negative connection structure), so that the state of each address allocation signal port can be connected or not connected, and then for any battery connection module, the states of the address allocation signal ports included in the battery connection module can be combined to form the state combination of the address allocation signal ports of the battery connection module, which is used to allocate the battery address for the battery inserted into the battery connection module.

[0027] It should be noted that the state combination of the address allocation signal ports of a battery connection module refers to the combination result of the states of the address allocation signal ports included in the battery connection module; for example, a battery connection module includes two address allocation signal ports, and the combination result of the states of the two address allocation signal ports included in the battery connection module is the state combination of the address allocation signal ports of the battery connection module.

[0028] It should be further noted that the state combinations of the address allocation signal ports included in different battery connection modules are different, that is, the state combination of the address allocation signal ports of each battery connection module is unique and cannot be completely the same, so that different battery addresses can be allocated for the batteries inserted into different battery connection modules, thereby ensuring the uniqueness of the battery address.

[0029] Further combining Figure 1 As shown in the figure, the parallel discharge system further includes a motor controller 50 connected to the connection device 10 and at least two batteries 20, the batteries 20 are plug-in connected to the battery connection module 110, and the battery address is updated according to the state combination of the address allocation signal ports included in the battery connection module when the battery is inserted into the battery connection module 110.

[0030] Among them, the battery positive port and the battery negative port of one of the battery connection modules 110 are respectively used to connect the positive and negative poles of one of the batteries 20, and accept the voltage and current provided by the battery connected to the battery connection module 110; and the positive connection structure 101 connects the battery positive port, and the negative connection structure 102 connects the battery negative port, so that the plurality of batteries 20 connected to the connection device 10 form a parallel connection, and the plurality of batteries 20 can be discharged together after being connected to the parallel discharge system.

[0031] In the parallel discharge system provided by the present application, the battery 20 is plug-in connected to the battery connection module 110, so that the number of batteries can be increased or replaced according to the use requirement of the parallel discharge system, for example, the number of parallel batteries is increased or a battery with larger capacity is replaced when it is required to increase the total capacity of the parallel discharge system.

[0032] The address allocation signal port in the battery connection module 110 is used to provide address allocation signals for the battery 20 connected to the battery connection module 110. In one battery connection module 110, the state of each address allocation signal port includes: connected or unconnected negative electrode connection structure; the state combination of the address allocation signal ports of different battery connection modules 110 is different.

[0033] It should be noted that, since the state of each address allocation signal port includes: connected or unconnected negative electrode connection structure, that is, each address allocation signal port includes two states. Since the number of address allocation signal ports in one battery connection module 110 can be greater than 1, for example, two address allocation signal ports are included in one battery connection module 110, and the state of each address allocation signal port is recorded as: connected or unconnected (i.e. connected or unconnected negative electrode connection structure), the state combination of the two address allocation signal ports in one battery connection module can exist in four kinds: connected and connected, unconnected and connected, connected and unconnected, and unconnected and unconnected, so that in the case of using 4 battery connection modules, the 4 state combinations of the address allocation signal ports of the 4 battery connection modules can be configured, that is, one battery connection module is configured with one state combination of the address allocation signal port, and the state combination of the address allocation signal port of different battery connection modules is different, so as to support the parallel connection of up to 4 batteries.

[0034] Further, in order to improve the performance of the parallel discharge system, more batteries need to be connected in parallel, and in some embodiments, the number of address allocation signal ports in each battery connection module is n, so that the state combination of the n address allocation signal ports is 2n, so that the number of battery connection modules can be less than or equal to 2n. n n .

[0035] Figure 2 is a schematic view of a connecting device provided by an embodiment of the present application. In some embodiments, referring to Figure 1 and Figure 2 , the number of battery connection modules can be 4, for example, Figure 2 ​The first battery connection module 111, the second battery connection module 112, the third battery connection module 113 and the fourth battery connection module 114 are shown. Each battery connection module includes two address allocation signal ports, for example, the first battery connection module 111 includes two address allocation signal ports addr_11 and addr_12; the second battery connection module 112 includes two address allocation signal ports addr_21 and addr_22; the third battery connection module 113 includes two address allocation signal ports addr_31 and addr_32; and the fourth battery connection module 114 includes two address allocation signal ports addr_41 and addr_42. Further, by distinguishing the state combinations of the address allocation signal ports included in the four battery connection modules, different battery addresses can be provided for the four batteries connected to the four battery connection modules.

[0036] Specifically, Figure 3 is an address signal allocation table provided by an embodiment of the present application in a parallel discharge system. Referring to Figures 1 to 3 Since the voltage of the address allocation signal port is 0V when the port is connected to the negative electrode connection structure 102, and the voltage of the address allocation signal port is not 0V when the port is not connected, the battery 20 can be configured to obtain the address allocation signal corresponding to the port as 0 when detecting that the voltage of any address allocation signal port is 0V upon insertion of the battery connection module, and obtain the address allocation signal corresponding to the port as 1 when detecting that the voltage of any address allocation signal port is not 0V upon insertion of the battery connection module, so that the combination of the address allocation signals corresponding to the address allocation signal ports included in the battery connection module into which the battery is inserted can represent the state combination of the address allocation signal ports included in the battery connection module, and be used to allocate a battery address to the battery inserted into the battery connection module. For example, the state combinations of the address allocation signal ports corresponding to the first battery connection module 111, the second battery connection module 112, the third battery connection module 113 and the fourth battery connection module 114 are 11, 10, 01 and 00 respectively, and the battery can allocate a battery address to the battery according to the state combination of the address allocation signal ports corresponding to the battery connection module into which the battery is inserted.

[0037] In some embodiments, when the state of the address allocation signal port of one battery connection module 110 is connected to the negative electrode connection structure, the address allocation signal port is connected to the part of the negative electrode connection structure 102 close to the negative electrode port of the battery of the battery connection module. By connecting the address allocation signal port to the part of the negative electrode connection structure 102 close to the negative electrode port of the battery of the battery connection module, the length of the connection line of the address allocation signal port connected to the negative electrode connection structure can be reduced, thereby simplifying the wiring structure and reducing production costs.

[0038] For example, the battery connection module contains two address allocation signal ports, and the battery inserted into the battery connection module can obtain the corresponding address allocation signal according to the voltage of the two address allocation signal ports, so as to obtain the state combination of the corresponding address allocation signal port of the battery connection module in which the battery is inserted, and allocate a battery address for itself according to the state combination of the corresponding address allocation signal port. The battery address is allocated by the battery 20 inserted into the battery connection module according to the state combination of the address allocation signal port of the battery connection module. Since the state combination of the address allocation signal port in different battery connection modules is different, the battery address is also different, which ensures the normal operation of the parallel discharge system.

[0039] For example, the battery connection module contains two address allocation signal ports, and the battery connection module contains two address allocation signal ports, and the address allocation signal of the two address allocation signal ports is represented as address allocation signal 1 and address allocation signal 2, respectively. Through the state combination of the address allocation signal 1 and the address allocation signal 2, four battery connection modules can be distinguished. When a battery 20 is connected to any battery connection module, the battery address can be quickly allocated according to the state combination of the corresponding address allocation signal port of the address allocation signal 1 and the address allocation signal 2, without the need for battery address negotiation with other batteries in the parallel discharge system, thereby improving the battery access speed of the parallel discharge system.

[0040] For example, the battery connection module 113 includes two address allocation signal ports addr_31 and addr_32. The state of the address allocation signal port addr_31 is not connected, that is, the voltage of the port addr_31 is not 0V. The state of the address allocation signal port addr_32 is connected to the negative pole connection structure, that is, the voltage of the port addr_32 is 0V. Therefore, when a battery 20 is inserted into the third battery connection module 113, the battery 20 can obtain the corresponding address allocation signal according to the voltage of the port addr_31 and addr_32, wherein the address allocation signal 1 is 1 and the address allocation signal 2 is 0. Therefore, the combination of the address allocation signal of the third battery connection module 113 is 10. According to the combination result of the address allocation signal of the third battery connection module 113, a battery address can be allocated to the battery inserted into the third battery connection module 113. The battery 20 after address allocation can access the parallel discharge system and communicate with other batteries 20 connected to the parallel discharge system to enter the discharge state.

[0041] It should be noted that, since the battery address of the battery 20 is assigned by obtaining the state combination of the address assignment signal ports of the battery connection module into which the battery 20 is inserted, the battery address of the battery does not need to be preconfigured in the production stage of the battery or before use of the battery, that is, the battery can be connected to the parallel discharge system when inserted into any battery connection module, and there is no need to prepare batteries with different addresses, thereby improving the compatibility of the parallel discharge system to the batteries and the universality of the batteries in the parallel discharge system.

[0042] In some embodiments, the port definition table of the battery connection module 110 is as shown in Figure 4a , wherein the battery access signal ports and the charging signal ports are not shown in Figure 2 . It can be seen that, by the state combination of the ports numbered 6 and 7 (i.e., address assignment signal 1 and address assignment signal 2), different battery connection modules 110 can be distinguished. Similarly, taking the battery connection module 113 as an example, referring to Figure 4b , the battery connection module 113 includes two address assignment signal ports addr_31 and addr_32, i.e., the ports numbered 6 and 7, respectively.

[0043] Continuing to refer to Figure 1 and Figure 2 , in some embodiments, the connection device further includes a motor connection module 120 for connecting the motor controller 50; the motor connection module 120 includes a motor positive electrode port and a motor negative electrode port, which provide driving voltage and driving current for the motor controller, and by connecting multiple batteries 20 through the connection device 10, driving voltage and driving current can be provided for the motor controller 50, thereby driving the motor controlled by the motor controller 50. The motor controller 50 has a positive electrode port and a negative electrode port corresponding to the motor positive electrode port and the motor negative electrode port of the motor connection module 120.

[0044] In some embodiments, continuing to refer to Figure 1 and Figure 2 , the parallel discharge system further includes at least one charger 30, and the connection device 10 further includes at least one charger connection module 130, and the charger 30 is pluggably connected to the charger connection module 130; each of the charger connection modules 130 includes a charger address assignment signal port, and the state of each of the charger address assignment signal ports includes: connecting or not connecting a negative electrode connection structure. The state combination of the charger address assignment signal ports in different charger connection modules is different, and the charger updates its address according to the state combination of the charger address assignment signal ports when inserted into the charger connection module.

[0045] The charger 30 is used to charge the battery connected to the parallel discharge system when the parallel discharge system does not discharge. The charger 30 is plug- connectable to the charger connection module 130, so that the charger 30 can be disconnected when charging is not needed.

[0046] Similar to the battery address assignment signal port in the battery connection module 110, when the number of chargers 30 is more than one and connected in parallel, different chargers 30 also need to have different addresses so as not to conflict when the chargers negotiate their discharge currents. Therefore, the state of the charger address assignment signal port includes: connected to the negative connection structure or not connected, so that different chargers 30 can be distinguished based on the state of the charger address assignment signal port.

[0047] In some specific embodiments, the number of charger connection modules 130 is two, and the state of each charger address assignment signal port is different. Since the voltage of the charger address assignment signal port is 0V when the port is connected to the negative connection structure 102, and the voltage of the charger address assignment signal port is not 0V when the port is not connected, the charger 30 can be set to detect the voltage of any charger address assignment signal port when the charger 30 is inserted into the charger connection module 130. If the voltage of any charger address assignment signal port is 0V, the charger 30 obtains the address assignment signal corresponding to the port as 0; if the voltage of any charger address assignment signal port is not 0V, the charger 30 obtains the address assignment signal corresponding to the port as 1. For example, referring to Figure 2 , the charger connection module includes a first charger connection module 131 and a second charger connection module 132, the state of the charger address assignment signal port addr_c1 of the first charger connection module 131 is not connected, that is, the voltage of the port addr_c1 is not 0V, and the state of the charger address assignment signal port addr_c2 of the second charger connection module 132 is connected to the negative connection structure, that is, the voltage of the port addr_c2 is 0V. Taking the first charger connection module 131 as an example, when a charger 30 is inserted into the first charger connection module 131, the charger can obtain the charger address assignment signal as 1 based on the voltage of the charger address assignment signal port addr_c1 not being 0V, so as to quickly assign a charger address to itself without needing to negotiate the address with other chargers or batteries.

[0048] In some embodiments, more chargers can be set according to the performance requirements of the parallel discharge system. It is assumed that the number of charger address assignment signal ports in each charger connection module is m, and the number of charger connection modules is less than or equal to 2 m .

[0049] In some embodiments, the connection device 10 further comprises a vehicle control connection module 140; the parallel discharge system further comprises a vehicle control device 40, which is connected to the vehicle control connection module 140. Since the parallel discharge system is used for driving the electric vehicle, the vehicle control connection module 140 is used to control the parallel discharge system according to the operation configuration of the electric vehicle.

[0050] In some embodiments, the connection device 10 further comprises a communication bus connection structure; the battery connection module further comprises a battery communication bus connection port, which is connected to the communication bus connection structure.

[0051] Reference is made to Figure 1 and Figure 2 In some specific embodiments, the parallel discharge system uses CAN bus for communication. CAN (Controller Area Network) is a serial communication protocol widely used in the fields of vehicle, industrial automation and mechanical control, etc., which can realize interconnection and communication of multiple devices on a bus network. In the example that the parallel discharge system uses CAN bus for communication, the communication bus connection structure comprises can_h_bus and can_L_bus, which are connected to all devices requiring communication, i.e. the battery connection module 110, the motor connection module 120, the charger connection module 130 and the vehicle control connection module 140 are all connected to the communication bus connection structure, so that the battery 20, the charger 30, the vehicle control system 40 and the motor controller 50 can realize mutual communication, for example, negotiation of discharge current.

[0052] It is also necessary to mention that, continuing to refer to Figure 1 and Figure 2 Since the positive connection structure 101 and the negative connection structure 102 connect the battery connection module 110 and the motor connection module 120, since the power required by the motor controller 50 is usually large, for example, in some embodiments, the rated current of the positive connection structure 101 and the negative connection structure 102 is 240 A, therefore the positive connection structure 101 and the negative connection structure 102 need to have a large cross-sectional area to ensure the efficiency of current passing, so as to ensure the stability of the parallel discharge system. In some specific embodiments, the positive connection structure 101 and the negative connection structure 102 are both busbars made of metal material, for example, copper bar, copper-clad aluminum bar or aluminum bar.

[0053] It can be seen that, in the parallel discharge system provided by the embodiment of the application, the plurality of batteries are connected in parallel through the connecting device, and the battery, the charger, the vehicle control system and the motor controller are connected, and the connecting device does not include any electronic element or controller, so that the connection structure is simplified, and the communication efficiency between the devices in the parallel discharge system is ensured.

[0054] The embodiment of the application also provides an electric vehicle comprising the parallel discharge system according to any one of the preceding embodiments, and the electric vehicle is driven through the parallel discharge system. The parallel discharge system provided by the embodiment of the application can increase or replace the battery as needed, so as to increase the battery capacity and improve the endurance mileage and output power performance of the electric vehicle.

[0055] Although the application is disclosed as above, the application is not limited to this. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the application, and the protection scope of the application should be subject to the scope defined by the claims.

Claims

1. A parallel discharge system, characterized by, The parallel discharge system comprises: a connection device, comprising: at least two battery connection modules, each of which comprises a battery positive electrode port, a battery negative electrode port and at least one address allocation signal port; a positive electrode connection structure connected to the battery positive electrode port; a negative electrode connection structure connected to the battery negative electrode port; wherein the state of each address allocation signal port comprises: connecting or not connecting the negative electrode connection structure; the state combination of the address allocation signal ports contained in different battery connection modules is different; a motor controller connected to the connection device and at least two batteries, which are plug-in connected to the battery connection modules, wherein the battery updates the battery address according to the state combination of the address allocation signal ports contained in the inserted battery connection module.

2. The shunt discharge system of claim 1, wherein, When the state of the address allocation signal port of one of the battery connection modules is connected to the negative electrode connection structure, the address allocation signal port is connected to the part of the negative electrode connection structure close to the battery negative electrode port of the battery connection module.

3. The shunt discharge system of claim 1, wherein, The number of address assignment signal ports in each battery connection module is n, and the number of battery connection modules is less than or equal to 2 n .

4. The shunt discharge system of claim 1, wherein, The connection device further comprises a motor connection module, which comprises a motor positive electrode port and a motor negative electrode port; The motor controller is connected to the motor connection module.

5. The shunt discharge system of claim 1, wherein, Further comprising at least one charger; The connection device further comprises: at least one charger connection module, the charger being plug-in connected to the charger connection module, each of which comprises: a charger positive electrode port, a charger negative electrode port and at least one charger address allocation signal port; The state of each charger address allocation signal port comprises: connecting or not connecting the negative electrode connection structure; the state combination of the charger address allocation signal ports in different charger connection modules is different, and the charger updates its address according to the state of the charger address allocation signal port when it is inserted into the charger connection module.

6. The shunt discharge system of claim 5, wherein, The number of charger address assignment signal ports in each of the charger connection modules is m, and the number of the charger connection modules is less than or equal to 2 m .

7. The shunt discharge system of claim 5, wherein, The connection device further comprises a communication bus connection structure; The battery connection module further comprises a battery communication bus port connected to the communication bus connection structure; The charger connection module further comprises a charger communication bus port connected to the communication bus connection structure.

8. The shunt discharge system of claim 7, wherein, Further comprising a vehicle control device; The connection device further comprises: a vehicle control connection module connected to the positive electrode connection structure, the negative electrode connection structure and the communication bus connection structure; The vehicle control device is connected to the vehicle control connection module.

9. The shunt discharge system of claim 1, wherein, The positive electrode connection structure and the negative electrode connection structure are both busbars made of metal.

10. An electric vehicle characterized by comprising: The parallel discharge system comprises: a connection device, comprising: at least two battery connection modules, each of which comprises a battery positive electrode port, a battery negative electrode port and at least one address allocation signal port; a positive electrode connection structure connected to the battery positive electrode port; a negative electrode connection structure connected to the battery negative electrode port; wherein the state of each address allocation signal port comprises: connecting or not connecting the negative electrode connection structure; the state combination of the address allocation signal ports contained in different battery connection modules is different; a motor controller connected to the connection device and at least two batteries, which are plug-in connected to the battery connection modules, wherein the battery updates the battery address according to the state combination of the address allocation signal ports contained in the inserted battery connection module. When the state of the address allocation signal port of one of the battery connection modules is connected to the negative electrode connection structure, the address allocation signal port is connected to the part of the negative electrode connection structure close to the battery negative electrode port of the battery connection module. The connection device further comprises a motor connection module, which comprises a motor positive electrode port and a motor negative electrode port; The motor controller is connected to the motor connection module. Further comprising at least one charger; The connection device further comprises: at least one charger connection module, the charger being plug-in connected to the charger connection module, each of which comprises: a charger positive electrode port, a charger negative electrode port and at least one charger address allocation signal port; The state of each charger address allocation signal port comprises: connecting or not connecting the negative electrode connection structure; the state combination of the charger address allocation signal ports in different charger connection modules is different, and the charger updates its address according to the state of the charger address allocation signal port when it is inserted into the charger connection module. The connection device further comprises a communication bus connection structure; The battery connection module further comprises a battery communication bus port connected to the communication bus connection structure; The charger connection module further comprises a charger communication bus port connected to the communication bus connection structure. Further comprising a vehicle control device; The connection device further comprises: a vehicle control connection module connected to the positive electrode connection structure, the negative electrode connection structure and the communication bus connection structure; The vehicle control device is connected to the vehicle control connection module. The positive electrode connection structure and the negative electrode connection structure are both busbars made of metal. The parallel discharge system comprises: a connection device, comprising: at least two battery connection modules, each of which comprises a battery positive electrode port, a battery negative electrode port and at least one address allocation signal port; a positive electrode connection structure connected to the battery positive electrode port; a negative electrode connection structure connected to the battery negative electrode port; wherein the state of each address allocation signal port comprises: connecting or not connecting the negative electrode connection structure; the state combination of the address allocation signal ports contained in different battery connection modules is different; a motor controller connected to the connection device and at least two batteries, which are plug-in connected to the battery connection modules, wherein the battery updates the battery address according to the state combination of the address allocation signal ports contained in the inserted battery connection module. When the state of the address allocation signal port of one of the battery connection modules is connected to the negative electrode connection structure, the address allocation signal port is connected to the part of the negative electrode connection structure close to the battery negative electrode port of the battery connection module. The connection device further comprises a motor connection module, which comprises a motor positive electrode port and a motor negative electrode port; The motor controller is connected to the motor connection module. Further comprising at least one charger; The connection device further comprises: at least one charger connection module, the charger being plug-in connected to the charger connection module, each of which comprises: a charger positive electrode port, a charger negative electrode port and at least one charger address allocation signal port; The state of each charger address allocation signal port comprises: connecting or not connecting the negative electrode connection structure; the state combination of the charger address allocation signal ports in different charger connection modules is different, and the charger updates its address according to the state of the charger address allocation signal port when it is inserted into the charger connection module. The connection device further comprises a communication bus connection structure; The battery connection module further comprises a battery communication bus port connected to the communication bus connection structure; The charger connection module further comprises a charger communication bus port connected to the communication bus connection structure. Further comprising a vehicle control device; The connection device further comprises: a vehicle control connection module connected to the positive electrode connection structure, the negative electrode connection structure and the communication bus connection structure; The vehicle control device is connected to the vehicle control connection module. The positive electrode connection structure and the negative electrode connection structure are both busbars made of metal.

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