Battery parallel wiring structure and electric vehicle

Abstract

The utility model provides a battery parallel wiring structure. The battery parallel wiring structure comprises a power distribution unit and a plurality of battery units, each battery unit comprises a plurality of battery packs, and the plurality of battery packs are connected in parallel; and the plurality of battery units are connected in parallel with the power supply distribution unit through high-voltage cables respectively. According to the battery parallel wiring structure, the number of high-voltage cables can be greatly reduced, wiring is facilitated, cost is saved, and meanwhile the weight of the whole vehicle is effectively reduced. The utility model further provides an electric vehicle.

Description

Technical Field

[0001] The utility model relates to the technical field of battery wiring, in particular to a battery parallel wiring structure and an electric vehicle. Background Art

[0002] Because large electric vehicles (such as buses, trucks, and coaches) have higher power and energy requirements for the battery system, they are generally equipped with a large number of battery packs. Multiple battery packs can be installed on the roof, the original engine warehouse at the rear of the vehicle, or the luggage compartment storage location under the vehicle.

[0003] The traditional high-voltage wiring method is to connect each battery pack to the power distribution unit (PDU). Since the battery packs on large electric vehicles are distributed in a relatively scattered manner, the traditional high-voltage wiring method will result in a large number of high-voltage cables and a long length of high-voltage cables, which will not only increase the complexity of wiring and inconvenience in operation, but also increase the cost and weight of the vehicle. Utility Model Content

[0004] The purpose of the utility model is to provide a battery parallel wiring structure, which can greatly reduce the number of high-voltage cables, facilitate wiring, save costs, and effectively reduce the weight of the entire vehicle.

[0005] The utility model provides a battery parallel wiring structure, comprising a power distribution unit and a plurality of battery units; each of the battery units comprises a plurality of battery packs, and the plurality of battery packs are connected in parallel; the plurality of battery units are respectively connected in parallel with the power distribution unit via high-voltage cables.

[0006] In one achievable manner, each of the battery units includes 2 to 5 battery packs.

[0007] In one achievable manner, each of the battery packs is provided with a contactor, and the contactor is used to make or break the electrical connection between the battery pack to which it belongs and other battery packs in the battery unit.

[0008] In an achievable manner, each of the battery packs includes at least one battery group and a connection terminal assembly, each of the battery groups includes one battery or a plurality of batteries arranged in series; the connection terminal assembly includes at least one positive connection terminal and at least one negative connection terminal, and the positive and negative electrodes of the battery group are connected to the positive connection terminal and the negative connection terminal, respectively;

[0009] In each of the two battery packs connected in parallel, the positive electrode connection terminal of one of the battery packs is connected to the positive electrode connection terminal of the other battery pack, and the negative electrode connection terminal of one of the battery packs is connected to the negative electrode connection terminal of the other battery pack.

[0010] In one achievable manner, each of the battery packs is provided with a contactor, and the contactor is connected between the positive electrode of the battery pack and the positive electrode connection terminal, or the contactor is connected between the negative electrode of the battery pack and the negative electrode connection terminal.

[0011] In one feasible manner, in each of the battery packs, the connecting terminal assembly includes at least two positive connecting terminals and at least two negative connecting terminals, the positive electrode of the battery pack is simultaneously connected to at least two of the positive connecting terminals, and the negative electrode of the battery pack is simultaneously connected to at least two of the negative connecting terminals.

[0012] In one achievable manner, in each of two battery packs connected in parallel, a positive electrode connection terminal of one of the battery packs is connected to a positive electrode connection terminal of the other battery pack, and a negative electrode connection terminal of one of the battery packs is connected to a negative electrode connection terminal of the other battery pack.

[0013] In one feasible manner, each of the three battery packs connected in parallel is a first battery pack, a second battery pack and a third battery pack, a positive electrode connection terminal of the second battery pack is connected to a positive electrode connection terminal of the first battery pack, and a negative electrode connection terminal of the second battery pack is connected to a negative electrode connection terminal of the first battery pack; another positive electrode connection terminal of the second battery pack is connected to a positive electrode connection terminal of the third battery pack, and another negative electrode connection terminal of the second battery pack is connected to a negative electrode connection terminal of the third battery pack.

[0014] In one feasible manner, the positive connection terminal in the battery pack that is not directly connected to other battery packs is an empty positive connection terminal, and the negative connection terminal in the battery pack that is not directly connected to other battery packs is an empty negative connection terminal; a high-voltage input port is provided on the power distribution unit, and the high-voltage input port includes a positive port and a negative port; any of the empty positive connection terminals is connected to the positive port, and any of the empty negative connection terminals is connected to the negative port.

[0015] In one achievable manner, any of the empty positive electrode connection terminals is connected to the positive electrode port via the high-voltage cable, and any of the empty negative electrode connection terminals is connected to the negative electrode port via the high-voltage cable.

[0016] In one feasible manner, the high-voltage cable includes a positive cable and a negative cable, one end of the positive cable and one end of the negative cable are both connected to the power distribution unit, and the other end of the positive cable and the other end of the negative cable are respectively connected to an empty positive connection terminal and an empty negative connection terminal on the same battery pack; or, the other end of the positive cable and the other end of the negative cable are respectively connected to an empty positive connection terminal and an empty negative connection terminal on different battery packs.

[0017] In one achievable manner, the power distribution unit is provided with a plurality of high-voltage input ports, and the plurality of battery units are respectively connected to the plurality of high-voltage input ports via the high-voltage cables.

[0018] The utility model also provides an electric vehicle, comprising the above-mentioned battery parallel wiring structure.

[0019] The battery parallel wiring structure provided by the utility model first divides the battery pack into multiple battery units according to their installation positions, then connects multiple battery packs in each battery unit in parallel, and then connects each battery unit in parallel with the power distribution unit through high-voltage cables. Such a configuration can greatly reduce the number of high-voltage cables used, facilitate wiring, save costs, and effectively reduce the weight of the entire vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the battery parallel wiring structure in an embodiment of the utility model.

[0021] Figure 2 It is a structural schematic diagram of a battery parallel wiring structure in another embodiment of the utility model.

[0022] Figure 3 It is a structural schematic diagram of a battery parallel wiring structure in another embodiment of the utility model.

[0023] In the figure: 1-power distribution unit, 11-high voltage input port, 111-positive port, 112-negative port, 2-battery pack, 2A-first battery pack, 2B-second battery pack, 2C-third battery pack, 20-battery group, 21-battery, 22-connecting terminal assembly, 221-positive connecting terminal, 221a-empty positive connecting terminal, 222-negative connecting terminal, 222a-empty negative connecting terminal, 23-contactor, 24-electrical connector, 3-high voltage cable, 31-positive cable, 32-negative cable. DETAILED DESCRIPTION

[0024] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0025] The terms "first", "second", "third", "fourth" and the like (if any) in the description and claims of the present invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0026] like Figure 1 As shown, the battery parallel wiring structure provided by the embodiment of the utility model includes a power distribution unit 1 (PDU, Power Distribution Unit) and multiple battery units M respectively designed in parallel, and the multiple battery units M are generally arranged at different positions on the vehicle. Each battery unit M includes multiple battery packs 2, and the multiple battery packs 2 are connected in parallel through electrical connectors 24. The multiple battery units M are connected in parallel with the power distribution unit 1 through high-voltage cables 3.

[0027] The power distribution unit 1 is also called a distribution box. The power distribution unit 1 belongs to the high-voltage control component on the vehicle side. The main function of the power distribution unit 1 is to aggregate the current input from the battery side, and then distribute the electric energy to various high-voltage subsystems on the vehicle side (through separate output ports on the power distribution unit 1) according to design requirements, such as inverter + electric motor, air conditioning system, power steering system, etc. Each battery pack 2 transmits high-voltage direct current to the power distribution unit 1, and the power distribution unit 1 converts the high-voltage direct current output by the battery pack 2 into the direct current or alternating current required for each load to work, so as to power the load. Depending on the load, the direct current required by each load includes high-voltage direct current and low-voltage direct current, wherein the high-voltage direct current is transmitted to the high-voltage load to power the high-voltage load; the low-voltage direct current is transmitted to the low-voltage load to power the low-voltage load.

[0028] Specifically, the battery parallel wiring structure provided in this embodiment first divides the battery pack 2 into multiple battery units M according to their installation positions (proximity principle), then connects multiple battery packs 2 in each battery unit M in parallel, and then connects each battery unit M in parallel with the power distribution unit 1 through the high-voltage cable 3. Compared with the traditional method of directly connecting each battery pack to the power distribution unit 1, such a setting can greatly reduce the number of high-voltage cables 3 used, facilitate wiring, save costs, and effectively reduce the weight of the entire vehicle.

[0029] like Figure 1 As shown, as an embodiment, the multiple battery packs 2 in each battery unit M are arranged close to or next to each other (principle of proximity), so that the electrical connector 24 used to connect the battery packs 2 in parallel can be set shorter, thereby facilitating wiring and saving costs.

[0030] As an implementation mode, the electrical connector 24 is a bus bar, for example, a copper bus bar. Of course, the electrical connector 24 can also be a cable or the like.

[0031] As an implementation mode, each battery unit M includes 2 to 5 battery packs 2 connected in parallel.

[0032] like Figure 1 As shown, as an embodiment, each battery unit M includes two battery packs 2 connected in parallel or three battery packs 2 connected in parallel.

[0033] Specifically, in this embodiment, the battery parallel wiring structure includes seven battery packs 2, and the seven battery packs 2 are divided into three battery units M. The three battery units M are connected in parallel with the power distribution unit 1; two of the battery units M respectively include two battery packs 2 connected in parallel, and the other battery unit M includes three battery packs 2 connected in parallel. The three battery units M can be installed on the roof, the original engine warehouse at the rear of the vehicle, and the storage position of the trunk under the vehicle, respectively. The specific setting positions of the three battery units M are not limited. Of course, in other embodiments, the seven battery packs 2 can also be divided into two battery units M.

[0034] like Figure 1 As shown, as an embodiment, each battery pack 2 is provided with a contactor 23, and the contactor 23 is used to conduct or disconnect the electrical connection between the battery pack 2 to which it belongs and other battery packs 2 in the battery cell M (i.e., the battery cell M to which the battery pack 2 corresponding to the contactor 23 belongs), so that the single battery pack 2 is connected or disconnected from the power distribution unit 1. Specifically, the contactor 23 is used to connect with the BMS (battery management system) electrical signal, and the BMS controls the contactor 23 to open or close, thereby controlling the corresponding battery pack 2 to be connected to the circuit or disconnected from the circuit, and thus being able to safely control the power on and off of the single battery pack 2.

[0035] like Figure 1 As shown, as an embodiment, each battery pack 2 includes at least one battery group 20 and a connection terminal assembly 22, each battery group 20 includes one battery 21 or multiple batteries 21 arranged in series; the connection terminal assembly 22 includes at least one positive connection terminal 221 and at least one negative connection terminal 222, and the positive and negative electrodes of the battery group 20 are respectively connected to the positive connection terminal 221 and the negative connection terminal 222. The high-voltage cable 3 is connected to the positive connection terminal 221 and the negative connection terminal 222.

[0036] In each of two battery packs 2 connected in parallel, the positive connection terminal 221 of one battery pack 2 is connected to the positive connection terminal 221 of the other battery pack 2 through an electrical connector 24, and the negative connection terminal 222 of one battery pack 2 is connected to the negative connection terminal 222 of the other battery pack 2 through an electrical connector 24.

[0037] like Figure 1 As shown, as an embodiment, each battery pack 2 includes a battery group 20, and each battery group 20 includes a plurality of batteries 21 arranged in series. Of course, in other embodiments, each battery pack 2 may also include a plurality of battery groups 20, and the plurality of battery groups 20 may be arranged in series or in parallel, and each battery group 20 may also include a battery 21.

[0038] like Figure 1 As shown, as an embodiment, in each battery pack 2, the contactor 23 is connected between the positive electrode of the battery pack 20 and the positive electrode connection terminal 221. Figure 3 As shown, in other embodiments, the contactor 23 may also be connected between the negative electrode of the battery pack 20 and the negative electrode connection terminal 222 .

[0039] like Figure 1 As shown, as an embodiment, in each battery unit M, the sum of the maximum allowable discharge currents of the multiple battery packs 2 does not exceed the maximum allowable current of the connection terminal assembly 22, thereby ensuring the safety of the connection terminal assembly 22. The maximum allowable current (peak value / continuous value) of the connection terminal assembly 22 is, for example: peak value 400A, continuous value 250A.

[0040] As an embodiment, the connection terminal assembly 22 (including the positive connection terminal 221 and the negative connection terminal 222) is a high voltage connector.

[0041] like Figure 1 As shown, as an embodiment, in each battery pack 2, the connection terminal assembly 22 includes at least two positive connection terminals 221 and at least two negative connection terminals 222 (in this embodiment, the connection terminal assembly 22 includes two positive connection terminals 221 and two negative connection terminals 222), the positive electrode of the battery pack 20 is simultaneously connected to at least two positive connection terminals 221, and the negative electrode of the battery pack 20 is simultaneously connected to at least two negative connection terminals 222. In each of the two battery packs 2 connected in parallel, a positive connection terminal 221 of one battery pack 2 is connected to a positive connection terminal 221 of the other battery pack 2 through an electrical connector 24, and a negative connection terminal 222 of one battery pack 2 is connected to a negative connection terminal 222 of the other battery pack 2 through an electrical connector 24, thereby facilitating the parallel connection between the battery packs 2.

[0042] like Figure 1 As shown, as an embodiment, at least one battery unit M includes three battery packs 2 connected in parallel. Each of the three battery packs 2 connected in parallel is a first battery pack 2A, a second battery pack 2B, and a third battery pack 2C connected in parallel in sequence, a positive electrode connection terminal 221 of the second battery pack 2B is connected to a positive electrode connection terminal 221 of the first battery pack 2A through an electrical connector 24, a negative electrode connection terminal 222 of the second battery pack 2B is connected to a negative electrode connection terminal 222 of the first battery pack 2A through an electrical connector 24; another positive electrode connection terminal 221 of the second battery pack 2B is connected to a positive electrode connection terminal 221 of the third battery pack 2C through an electrical connector 24, and another negative electrode connection terminal 222 of the second battery pack 2B is connected to a negative electrode connection terminal 222 of the third battery pack 2C through an electrical connector 24.

[0043] like Figure 1 As shown, as an embodiment, the positive connection terminal 221 in the battery pack 2 that is not directly connected to other battery packs 2 is an empty positive connection terminal 221a, and the negative connection terminal 222 in the battery pack 2 that is not directly connected to other battery packs 2 is an empty negative connection terminal 222a. The high-voltage cable 3 is connected to any empty positive connection terminal 221a and any empty negative connection terminal 222a (that is, the positive connection terminal 221 used in parallel between the battery packs 2 and the positive connection terminal 221 used to connect the battery pack 2 to the high-voltage cable 3 are different positive connection terminals 221, and the negative connection terminal 222 used in parallel between the battery packs 2 and the negative connection terminal 222 used to connect the battery pack 2 to the high-voltage cable 3 are different negative connection terminals 222), thereby facilitating wiring operations. Figure 1 As shown, as an embodiment, the high-voltage cable 3 includes a positive cable 31 and a negative cable 32, one end of the positive cable 31 and one end of the negative cable 32 are both connected to the power distribution unit 1, and the other end of the positive cable 31 and the other end of the negative cable 32 are respectively connected to an empty positive connection terminal 221a and an empty negative connection terminal 222a on the same battery pack 2.

[0044] like Figure 2 As shown, as another embodiment, the high-voltage cable 3 includes a positive cable 31 and a negative cable 32, one end of the positive cable 31 and one end of the negative cable 32 are both connected to the power distribution unit 1, and the other end of the positive cable 31 and the other end of the negative cable 32 are respectively connected to the empty positive connection terminal 221a and the empty negative connection terminal 222a on different battery packs 2 (that is, the positive cable 31 is connected to the empty positive connection terminal 221a on one battery pack 2, and the negative cable 32 is connected to the empty negative connection terminal 222a on another battery pack 2).

[0045] like Figure 1As shown, as an embodiment, a high voltage input port 11 is provided on the power distribution unit 1, and the high voltage input port 11 includes a positive port 111 and a negative port 112. Any empty positive connection terminal 221a is connected to the positive port 111 through a high voltage cable 3, and any empty negative connection terminal 222a is connected to the negative port 112 through a high voltage cable 3.

[0046] Specifically, the high-voltage cable 3 includes a positive cable 31 and a negative cable 32, one end of the positive cable 31 is connected to the positive connection terminal 221, and the other end of the positive cable 31 is connected to the positive port 111; one end of the negative cable 32 is connected to the negative connection terminal 222, and the other end of the negative cable 32 is connected to the negative port 112.

[0047] like Figure 1 As shown, as an implementation mode, a plurality of high-voltage input ports 11 are provided on the power distribution unit 1, and the number of the plurality of high-voltage input ports 11 is the same as the number of the plurality of battery cells M and corresponds one to one; the plurality of battery cells M are respectively connected to the plurality of high-voltage input ports 11 through high-voltage cables 3. Since the battery parallel wiring structure is to first connect the plurality of battery packs 2 in parallel to form the battery cells M according to the principle of proximity, and then connect the plurality of battery cells M in parallel to the power distribution unit 1 respectively, compared with the traditional method of directly connecting each battery pack to the power distribution unit (in the traditional method, the power distribution unit needs to be provided with a high-voltage input port for each battery pack), the number of high-voltage input ports 11 on the power distribution unit 1 can be greatly reduced.

[0048] Specifically, in this embodiment, the number of battery units M is three, and the power distribution unit 1 is correspondingly provided with three high-voltage input ports 11. Of course, in other embodiments, the number of battery units M may also be two (or other numbers), and the power distribution unit 1 is correspondingly provided with two high-voltage input ports 11 (or other numbers).

[0049] After the multiple battery packs 2 in the battery unit M are connected in parallel, the total current after parallel connection needs to flow through the connecting terminal assembly 22 in the battery unit M that is connected to the power distribution unit 1. The battery packs 2 in the battery unit M can adopt the same specifications. When the battery packs 2 in the battery unit M adopt the same specifications, the current limit value of the connecting terminal assembly 22 on each battery pack 2 is the same. When multiple battery packs 2 are connected in parallel, since the currents of the multiple battery pack 2 branches need to flow through the same connecting terminal assembly 22 (that is, the connecting terminal assembly 22 connected to the power distribution unit 1), in order to avoid damage to the connecting terminal assembly 22 due to excessive current, the total current of the system needs to be limited to ensure that the total current of each branch in the battery unit M does not exceed the maximum current allowed by the connecting terminal assembly 22. Therefore, an embodiment of the utility model also provides a current limiting strategy based on the above-mentioned battery parallel wiring structure, specifically including:

[0050] (1) The master battery management unit (MBMU) detects the total number of branches connected to the circuit in the system X (that is, the total number of battery packs 2 actually connected to the power distribution unit 1 by each battery unit M. For example, in this embodiment, if 7 battery packs 2 out of 3 battery units M are connected to the power distribution unit 1, that is, there are 7 branches connected to the circuit in the system, that is, X is 7), and the maximum value P of the branches connected to the circuit in each battery unit M (that is, the maximum value of the battery packs 2 actually connected to the power distribution unit 1 by each battery unit M. For example, in this embodiment, if 7 battery packs 2 out of 3 battery units M are connected to the power distribution unit 1, and the number of branches connected to the circuit of the 3 battery units M is 2, 2, and 3 respectively, then P is 3); the maximum allowable current of the connection terminal assembly 22 is: peak value K1 (for example, 400A), continuous value K2 (for example, 250A);

[0051] (2) Calculate the maximum allowable current of a single branch in the system:

[0052] I_Peak_string (peak current) = K1 / P;

[0053] I_Constant_string (continuous current) = K2 / P;

[0054] The maximum current allowed by the system is:

[0055] I_Peak_system_cal (peak current) = (K1 / P)*X;

[0056] I_Constant_system_cal (continuous current) = (K2 / P)*X.

[0057] Specifically, taking the system with 3 battery units M and 7 branches in this embodiment as an example, the calculation method of the above current limiting strategy in various situations is described in detail:

[0058] The total number X of branches connected to the circuit in the MBMU detection system, and the maximum value P of the branches connected to the circuit in each battery unit M; the maximum allowable current of the connecting terminal assembly 22 is: peak value 400A (ie K1 is 400A), continuous value 250A (ie K2 is 250A).

[0059] Case 1: If all 7 branches in the system are available (i.e., all connected to the circuit), that is, X=7, P=3, then:

[0060] I_Peak_system_cal=(400A / 3)*7=933A;

[0061] I_Constant_system_cal=(250A / 3)*7=583A.

[0062] Case 2: If there are only 6 branches available in the system, and each battery unit M contains 2 branches, that is, X=6, P=2, then:

[0063] I_Peak_system_cal=(400A / 2)*6=1200A;

[0064] I_Constant_system_cal=(250A / 2)*6=750A.

[0065] Case 3: If there are only 5 branches available in the system, one battery unit M contains 3 branches, and the other 2 branches are distributed in another battery unit M or in two other battery units M, that is, X = 5, P = 3, then:

[0066] I_Peak_system_cal=(400A / 3)*5=666A;

[0067] I_Constant_system_cal=(250A / 3)*5=416.7A.

[0068] Case 4: If there are only 4 branches available in the system, and each battery unit M contains 2 branches, that is, X=4, P=2, then:

[0069] I_Peak_system_cal=(400A / 2)*4=800A;

[0070] I_Constant_system_cal=(250A / 2)*4=500A.

[0071] Case 5: If there are only 4 branches available in the system, one battery unit M contains 3 branches, and the other battery unit M contains 1 branch, that is, X = 4, P = 3, then:

[0072] I_Peak_system_cal=(400A / 3)*4=533A;

[0073] I_Constant_system_cal=(250A / 3)*4=333A.

[0074] Case 6: If there are only 3 branches available in the system, and all 3 branches are in the same battery unit M, that is, X=3, P=3, then:

[0075] I_Peak_system_cal=(400A / 3)*3=400A;

[0076] I_Constant_system_cal=(250A / 3)*3=250A.

[0077] It should be noted that the current limit calculated above is an additional limit due to the battery parallel wiring structure. In actual operation, the branch current limit calculated based on temperature and SOC will also be considered. The BMS will compare the current limit value calculated based on the battery parallel wiring structure with the current limit value of the branch itself, and take the smaller value of the two as the real-time current limit value of the system.

[0078] The embodiment of the utility model also provides an electric vehicle, such as a large electric vehicle, including the above-mentioned battery parallel wiring structure. The large electric vehicle can be a bus, a truck, a coach, etc., and multiple battery units M can be installed in the roof of the large electric vehicle, the original engine warehouse at the rear of the vehicle, and the luggage storage room under the vehicle.

[0079] The battery parallel wiring structure provided by the embodiment of the utility model first divides the battery pack 2 into multiple battery units M according to their installation positions (proximity principle), then connects multiple battery packs 2 in each battery unit M in parallel, and then connects each battery unit M in parallel with the power distribution unit 1 through the high-voltage cable 3. Compared with the traditional method of directly connecting each battery pack to the power distribution unit, such a setting can greatly reduce the number of high-voltage cables 3 used, facilitate wiring, save costs, and effectively reduce the weight of the whole vehicle.

[0080] The above are only specific implementations of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A battery parallel wiring structure, It is characterized in that It comprises a power distribution unit (1) and a plurality of battery units (M); each of the battery units (M) comprises a plurality of battery packs (2), and the plurality of battery packs (2) are connected in parallel; and the plurality of battery units (M) are connected in parallel to the power distribution unit (1) via high-voltage cables (3).

2. The battery parallel wiring structure according to claim 1, It is characterized in that Each of the battery units (M) includes 2 to 5 battery packs (2).

3. The battery parallel wiring structure according to claim 1, It is characterized in that Each of the battery packs (2) is provided with a contactor (23), and the contactor (23) is used to connect or disconnect the electrical connection between the battery pack (2) to which it belongs and other battery packs (2) in the battery unit (M).

4. The battery parallel wiring structure according to claim 1, It is characterized in that Each of the battery packs (2) comprises at least one battery group (20) and a connection terminal assembly (22); each of the battery groups (20) comprises one battery (21) or a plurality of batteries (21) arranged in series; the connection terminal assembly (22) comprises at least one positive connection terminal (221) and at least one negative connection terminal (222); the positive and negative electrodes of the battery group (20) are respectively connected to the positive connection terminal (221) and the negative connection terminal (222); In each of the two battery packs (2) connected in parallel, the positive electrode connection terminal (221) of one of the battery packs (2) is connected to the positive electrode connection terminal (221) of the other battery pack (2), and the negative electrode connection terminal (222) of one of the battery packs (2) is connected to the negative electrode connection terminal (222) of the other battery pack (2).

5. The battery parallel wiring structure as claimed in claim 4, It is characterized in that Each of the battery packs (2) is provided with a contactor (23), and the contactor (23) is connected between the positive electrode of the battery pack (20) and the positive electrode connection terminal (221), or the contactor (23) is connected between the negative electrode of the battery pack (20) and the negative electrode connection terminal (222).

6. The battery parallel wiring structure according to claim 4, It is characterized in that In each of the battery packs (2), the connection terminal assembly (22) includes at least two positive connection terminals (221) and at least two negative connection terminals (222); the positive electrode of the battery pack (20) is simultaneously connected to the at least two positive connection terminals (221); and the negative electrode of the battery pack (20) is simultaneously connected to the at least two negative connection terminals (222).

7. The battery parallel wiring structure according to claim 6, It is characterized in that In each of the two battery packs (2) connected in parallel, a positive electrode connection terminal (221) of one of the battery packs (2) is connected to a positive electrode connection terminal (221) of the other battery pack (2), and a negative electrode connection terminal (222) of one of the battery packs (2) is connected to a negative electrode connection terminal (222) of the other battery pack (2).

8. The battery parallel wiring structure according to claim 6, It is characterized in that Each of the three battery packs (2) connected in parallel is a first battery pack (2A), a second battery pack (2B) and a third battery pack (2C); a positive electrode connection terminal (221) of the second battery pack (2B) is connected to a positive electrode connection terminal (221) of the first battery pack (2A), and a negative electrode connection terminal (222) of the second battery pack (2B) is connected to a negative electrode connection terminal (222) of the first battery pack (2A); another positive electrode connection terminal (221) of the second battery pack (2B) is connected to a positive electrode connection terminal (221) of the third battery pack (2C), and another negative electrode connection terminal (222) of the second battery pack (2B) is connected to a negative electrode connection terminal (222) of the third battery pack (2C).

9. The battery parallel wiring structure according to any one of claims 6 to 8, It is characterized in that A positive electrode connection terminal (221) in the battery pack (2) that is not directly connected to other battery packs (2) is an empty positive electrode connection terminal (221a), and a negative electrode connection terminal (222) in the battery pack (2) that is not directly connected to other battery packs (2) is an empty negative electrode connection terminal (222a); a high-voltage input port (11) is provided on the power distribution unit (1), and the high-voltage input port (11) includes a positive electrode port (111) and a negative electrode port (112); any of the empty positive electrode connection terminals (221a) is connected to the positive electrode port (111), and any of the empty negative electrode connection terminals (222a) is connected to the negative electrode port (112).

10. The battery parallel wiring structure according to claim 9, It is characterized in that Any of the empty positive electrode connection terminals (221a) is connected to the positive electrode port (111) via the high-voltage cable (3), and any of the empty negative electrode connection terminals (222a) is connected to the negative electrode port (112) via the high-voltage cable (3).

11. The battery parallel wiring structure according to claim 10, It is characterized in that The high-voltage cable (3) comprises a positive cable (31) and a negative cable (32), one end of the positive cable (31) and one end of the negative cable (32) are both connected to the power distribution unit (1), and the other end of the positive cable (31) and the other end of the negative cable (32) are respectively connected to an empty positive connection terminal (221a) and an empty negative connection terminal (222a) on the same battery pack (2); or, the other end of the positive cable (31) and the other end of the negative cable (32) are respectively connected to an empty positive connection terminal (221a) and an empty negative connection terminal (222a) on different battery packs (2).

12. The battery parallel wiring structure according to any one of claims 1 to 8, It is characterized in that The power distribution unit (1) is provided with a plurality of high-voltage input ports (11), and the plurality of battery units (M) are respectively connected to the plurality of high-voltage input ports (11) via the high-voltage cables (3).

13. An electric vehicle, It is characterized in that The invention comprises a battery parallel wiring structure as claimed in any one of claims 1 to 12.

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