Battery Pack Connection Component, Battery Pack Module and Battery Pack

Abstract

The present invention provides a battery pack connection assembly, a battery pack module and a battery pack, the battery pack connection assembly includes: at least one first connector, the first connector includes: a second insulating cavity, the two end openings of the second insulating cavity are respectively provided with a plurality of first wiring terminals; a wiring plug is electrically connected to the first wiring terminal through a wiring harness; a conductive connector extending along a first direction is provided in the two first insulating cavities, the two ends of each conductive connector respectively form a second wiring terminal exposed in the first insulating cavity, the first end of each conductive connector is provided with a conductive connection seat extending along a second direction and away from the second insulating cavity, at least one first opening is provided on one side of the first insulating cavity, the third direction of the first opening is perpendicular to the plane defined by the first direction and the second direction, and the first opening forms a connection channel in contact with the surface of the conductive connection seat. The present invention is easy and fast to install, and greatly improves the stability of the power supply connection of the battery pack module.

Description

Technical Field

[0001] The present invention relates to the field of in-vehicle electrical connectors, and in particular to a battery pack connection assembly, a battery pack module and a battery pack. Background Art

[0002] A power battery module generally has two high-voltage poles and one low-voltage connector. Each time two modules are connected, the high-voltage poles need to be connected with a copper busbar fixed with bolts, and the low-voltage wiring harness is connected to the module low-voltage connector through manual installation. With the development of assembly technology, different application scenarios require improving the installation efficiency of battery modules. This method of fixing the module copper busbar with bolts and manually installing the low-voltage connector is time-consuming and cumbersome to install.

[0003] In view of this, the present invention provides a battery pack connection assembly, a battery pack module and a battery pack. Summary of the invention

[0004] In view of the problems in the prior art, the purpose of the present invention is to provide a battery pack connection assembly, a battery pack module and a battery pack, which are easy and quick to install, can achieve rapid positioning, and greatly improve the stability of the power supply connection of the battery pack module.

[0005] An embodiment of the present invention provides a battery pack connection assembly, comprising: at least one first connection member, wherein the first connection member comprises:

[0006] A second insulating cavity, wherein two end openings of the second insulating cavity are respectively provided with a plurality of first wiring terminals, and each of the first wiring terminals is respectively electrically connected to a first wiring terminal at the other end;

[0007] a wiring plug-in, the wiring plug-in being electrically connected to each of the first wiring terminals in the second insulating cavity through a wiring harness; and

[0008] Two first insulating cavities are integrally formed on both sides of the second insulating cavity, each of the first insulating cavities is provided with a conductive connector extending along the first direction, and the two ends of each of the conductive connectors respectively form a second terminal exposed from the first insulating cavity, and the first end of each of the conductive connectors is provided with a conductive connection seat extending along the second direction and away from the second insulating cavity, and the conductive connection seat is integrally formed with the conductive connector, and at least one first opening is provided on one side of the first insulating cavity, and the third direction of the first opening is perpendicular to the plane defined by the first direction and the second direction, and the first opening forms a connection channel in contact with the surface of the conductive connection seat.

[0009] Preferably, the first wiring terminals of the second insulating cavity are all low-voltage male wiring terminals, and the low-voltage male wiring terminals provide a plug-in direction along the first direction.

[0010] Preferably, the second connection terminals of the first insulating cavity are all high-voltage connection female terminals, and the high-voltage connection female terminals provide an insertion direction along the first direction.

[0011] Preferably, the second insulating cavity is provided with a second opening for the wire harness to pass through, and the second opening and the first opening are located on the same side of the first connecting member.

[0012] Preferably, the conductive connection seat has a connection hole with the first direction as the axial direction.

[0013] Preferably, it further includes at least one third connecting member;

[0014] On the first side of the third connecting member and the second side opposite to the first side, a third connection terminal and two fourth connection terminals respectively located on both sides of the third connection terminal are provided. The third connection terminal and the fourth connection terminals on the first side of the third connecting member are respectively inserted and conductively connected with the first connection terminal and the second connection terminal at the first end of the first connecting member; the third connection terminal and the fourth connection terminals on the second side of the third connecting member are respectively inserted and conductively connected with the first connection terminal and the second connection terminal at the second end of another first connecting member; the third connection terminal is a low-voltage connection female terminal, and the fourth connection terminal is a high-voltage connection male terminal.

[0015] Preferably, on both sides of the third connecting member, side walls surrounding the third connection terminal and engaging with the opening of the second insulating cavity are provided.

[0016] Preferably, it further includes a fourth connecting member. On one side of the fourth connecting member, a fifth connection terminal inserted and conductively connected with the first connection terminal at the second end of the first connecting member and a sixth connection terminal inserted and conductively connected with the second connection terminal at the second end are provided. The fifth connection terminal is a low-voltage connection female terminal, and the sixth connection terminal is a high-voltage connection male terminal.

[0017] Another embodiment of the present invention further provides a battery pack module, including a battery pack body and the battery pack connection assembly as described above. On both sides of the battery pack body, a seventh connection terminal for providing low voltage, an eighth connection terminal for providing high-voltage positive electrode, and a ninth connection terminal for providing high-voltage negative electrode are respectively provided;

[0018] The two first connecting members are respectively connected to both sides of the battery pack body. The connection plugs of the first connecting members on each side are inserted into the seventh connection terminal, and the two first openings are sleeved on the eighth connection terminal and the ninth connection terminal on the same side of the battery pack body. The eighth connection terminal and the ninth connection terminal are respectively in surface contact and conductively connected with the conductive connection seat of the conductive connecting member in the first insulating cavity.

[0019] Another embodiment of the present invention further provides a battery pack, which includes at least n battery pack bodies stacked and connected along the first direction and the battery pack connection component as described above, where n≥2, and adjacent battery pack bodies are connected by two of the third connecting pieces;

[0020] On both sides of each battery pack body, a seventh wiring terminal for providing low voltage, an eighth wiring terminal for providing high voltage positive electrode, and a ninth wiring terminal for providing high voltage negative electrode are respectively provided; the two first connecting pieces are respectively connected to both sides of the battery pack body, the wiring plug-ins of the first connecting pieces on each side are inserted into the seventh wiring terminal, and the two first openings are sleeved on the eighth wiring terminal and the ninth wiring terminal on the same side of the battery pack body, and the eighth wiring terminal and the ninth wiring terminal are respectively in surface contact and conduction with the conductive connection seat of the conductive connecting piece in the first insulating cavity;

[0021] The first ends of the first connecting pieces on both sides of the battery pack body are respectively inserted into the second side of one of the third connecting pieces, and the second ends of the first connecting pieces on both sides of the adjacent other battery pack body are respectively on the first side of the third connecting piece. The seventh wiring terminals of the n battery packs are mutually conducted, the eighth wiring terminals of the n battery packs are mutually conducted, and the ninth wiring terminals of the n battery packs are mutually conducted.

[0022] The purpose of the present invention is to provide a battery pack connection component, a battery pack module, and a battery pack that are convenient and fast to install, can achieve rapid positioning, and greatly improve the stability of the power supply connection of the battery pack module. Description of the Drawings

[0023] By reading the detailed description of the non-restrictive embodiments with reference to the following drawings, other features, purposes, and advantages of the present invention will become more obvious.

[0024] Figure 1 is a schematic diagram of the first connecting piece in the present invention.

[0025] Figure 2 is a cross-sectional view of the first connecting piece in the present invention.

[0026] Figure 3 is a schematic diagram of the third connecting piece in the present invention.

[0027] Figure 4 is a schematic diagram of the fourth connecting piece in the present invention.

[0028] Figure 5 is a schematic diagram of the battery pack module in the present invention.

[0029] Figure 6 is a schematic diagram of the battery pack in the present invention.

[0030] Figure 7It is a cross-sectional view of two first connectors in the battery pack of the present invention connected by a third connector.

[0031] Figure 8 It is a cross-sectional view of the connection between the first connector and the fourth connector in the battery pack of the present invention.

[0032] Reference numerals

[0033] 1 First connector

[0034] 10 Protection cover

[0035] 11 Conductive connector

[0036] 12 Low-voltage connection male head

[0037] 13 High-voltage connection female head

[0038] 14 High-voltage connection female head

[0039] 15 Conductive connection seat

[0040] 16 Low-voltage connection male head

[0041] 17 First insulating cavity

[0042] 18 Second insulating cavity

[0043] 19 Wire

[0044] 2 Wiring plug

[0045] 21 Wiring harness

[0046] 3 Third connector

[0047] 31 Third connector body

[0048] 32 Low-voltage connection female head

[0049] 33 High-voltage connection male head

[0050] 34 Low-voltage connection female head

[0051] 35 High-voltage connection male head

[0052] 4 Fourth connector

[0053] 41 Fourth connector body

[0054] 42 Low-voltage connection female head

[0055] 43 High-voltage connection male head

[0056] 44 Fixing hole

[0057] 5 First battery pack body

[0058] 51 High-voltage positive copper busbar

[0059] 52 High-voltage negative copper busbar

[0060] 6 Second battery pack body

[0061] 61 High-voltage positive copper busbar

[0062] 62 High-voltage negative copper busbar Detailed implementation manners

[0063] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. Like reference numerals in the figures denote the same or similar structures, and thus their repetitive description will be omitted.

[0064] Figure 1 is a schematic diagram of the first connector in the present invention. Figure 2 is a cross-sectional view of the first connector in the present invention. As Figure 1 and 2 shown, the battery pack connection assembly of the present invention includes: at least one first connector 1, and the first connector 1 includes: a second insulating cavity 18 and two first insulating cavities 17 extending parallel in the first direction Y (the longitudinal direction based on the drawing), and a wiring plug-in 2.

[0065] At both ends of the second insulating cavity 18, there are respectively provided a plurality of low-voltage connection male terminals 12, 16. The low-voltage connection male terminals 12, 16 provide an insertion direction along the first direction Y. Each low-voltage connection male terminal 16 is electrically connected to one low-voltage connection male terminal 12 at the other end through a wire 19 in the second insulating cavity 18.

[0066] The wiring plug-in 2 is electrically connected to each first wiring terminal in the second insulating cavity 18 through a wire harness 21.

[0067] Two first insulating cavities 17 are integrally formed on both sides of the second insulating cavity 18. A conductive connector 11 extending along the first direction Y is provided in each first insulating cavity 17. The two ends of each conductive connector 11 respectively form high-voltage female connectors 13 and 14 exposed in the first insulating cavity 17. The high-voltage female connectors 13 and 14 provide a plug-in direction along the first direction Y. In this embodiment, the high-voltage female connector refers to a female connector for connecting the high-voltage positive terminal or the high-voltage negative terminal of the vehicle-mounted battery pack, and the low-voltage male connector refers to a male connector for connecting the low-voltage terminal of the vehicle-mounted battery pack. The definitions of other "male connector", "female connector", "high voltage" and "low voltage" in the text are similar, and will not be repeated below. The first end of each conductive connector 11 is provided with a conductive connection seat 15 extending along the second direction X (based on the horizontal direction of the drawing) and away from the second insulating cavity 18. The conductive connection seat 15 has a connection hole with the first direction Y as the axial direction. The conductive connection seat 15 is integrally formed with the conductive connector 11, and at least one first opening is provided on one side of the first insulating cavity 17. The third direction Z (the direction perpendicular to the drawing) of the first opening is perpendicular to the plane defined by the first direction Y and the second direction X, and the first opening forms a connection channel in surface contact with the conductive connection seat 15. Each first insulating cavity 17 is also provided with a protective cover 10 for shielding the conductive connection seat 15. The protective cover 10 is used to protect the copper busbar connected to the conductive connection seat 15 from leakage, so as to avoid the risk of personnel touching high voltage.

[0068] In a preferred embodiment, the second insulating cavity 18 is provided with a second opening for the wire harness 21 to pass through, and the second opening and the first opening are located on the same side of the first connector 1 .

[0069] The plugging and unplugging directions of the low-voltage male connector and the high-voltage female connector in this embodiment are the same, so that the low-voltage male connector and the high-voltage female connector of the first connector and the other connectors can be synchronously connected or disconnected through a single plugging and unplugging action between the first connector and the other connectors.

[0070] Figure 3 Schematic diagram of the third connecting member in the present invention. Figure 3As shown, the battery pack connection assembly of the present invention also includes at least one third connector 3. A low-voltage female connector 32 and two high-voltage male connectors 33 are provided on the first side of the third connector body 31 of the third connector 3, respectively, and two high-voltage male connectors 33 are provided on both sides of the low-voltage female connector 32. A low-voltage female connector 34 and two high-voltage male connectors 35 are provided on the second side of the third connector body 31, which is opposite to the first side. The low-voltage female connector 32 and the high-voltage male connector 33 on the first side of the third connector 3 are respectively plugged and connected with the low-voltage male connector and the high-voltage female connector at the first end of the first connector 1. The low-voltage female connector 34 and the high-voltage male connector 35 on the second side of the third connector 3 are respectively plugged and connected with the low-voltage male connector and the high-voltage female connector at the second end of another first connector 1. Through a third connector 3, two adjacent first connectors 1 can be mechanically connected and the independent electrical connection of the wiring terminals with the same properties can be ensured, thereby ensuring the stability of the connection. The third connecting member 3 can connect different battery pack connection components in series or in parallel, but is not limited thereto.

[0071] In a preferred embodiment, two sides of the third connector 3 are respectively provided with side walls surrounding the low-voltage female connector and engaging with the opening of the second insulating cavity 18 to enhance the connection strength between the two.

[0072] Figure 4 is a schematic diagram of the fourth connecting member in the present invention. Figure 4 As shown, the battery pack connection assembly of the present invention further includes a fourth connector 4, and a low-voltage female connector 42 plugged and connected to the low-voltage male connector of the second end of the first connector 1 and a high-voltage male connector 43 plugged and connected to the high-voltage female connector of the second end are provided on one side of the fourth connector body 41 of the fourth connector 4. A fixing hole 44 is provided on the side of each high-voltage male connector 43 away from the low-voltage female connector 42, for fixing the battery pack to the mounting surface.

[0073] Figure 5 Schematic diagram of the battery pack module of the present invention. Figure 5 As shown, the battery pack module of the present invention includes a battery pack body 5 and the above-mentioned battery pack connection assembly. The two sides of the battery pack body 5 are respectively provided with a seventh terminal (not shown in the figure) providing a low voltage, an eighth terminal (for example: a copper busbar, not shown in the figure) providing a high voltage positive electrode, and a ninth terminal (for example: a copper busbar, not shown in the figure) providing a high voltage negative electrode. The two first connectors 1 are respectively connected to the two sides of the battery pack body by threads, and the wiring plug-in of the first connector 1 on each side is plugged into the seventh terminal. The two first openings are sleeved with the eighth terminal and the ninth terminal on the same side of the battery pack body. The eighth terminal and the ninth terminal are respectively in contact with and conductively connected to the conductive connection seat surface of the conductive connector in the first insulating cavity.

[0074] Figure 6 It is a schematic diagram of the battery pack of the present invention. Figure 7 It is a cross-sectional view of two first connectors in the battery pack of the present invention connected by a third connector. Figure 8 It is a cross-sectional view of the connection between the first connector and the fourth connector in the battery pack of the present invention. As Figures 6 to 8 shown, the battery pack of this embodiment includes two battery pack bodies 5 and 6 stacked and connected along the first direction Y and the battery pack connection assembly as described above. The battery pack bodies 5 and 6 are connected by two third connectors 3. And the second ends of the third connectors 3 of the battery pack body 6 are respectively connected to a fourth connector 4, and the battery pack is fixed to the installation surface through the fixing holes 44 of the fourth connector 4. The number of mutually stacked battery pack bodies can be greater than 2, and mechanical connection and electrical connection are also carried out through the battery pack connection assembly, not limited to this. The battery pack in this embodiment is jointly composed of multiple battery pack bodies (≥2), a corresponding management system, and a housing.

[0075] On both sides of the battery pack body 5, there are respectively provided a seventh wiring terminal for providing low voltage (not shown in the figure), a high-voltage positive copper row 51 for providing high voltage positive, and / or a high-voltage negative copper row 52 for providing high voltage negative; the two first connectors 1 are respectively connected to both sides of the battery pack body. The wiring plug 2 of each first connector 1 on each side is inserted into the seventh wiring terminal, and the two first openings are sleeved on the high-voltage positive copper row 51 and / or the high-voltage negative copper row 52 on the same side of the battery pack body. The high-voltage positive copper row 51 and / or the high-voltage negative copper row 52 are in surface contact and conduction with the conductive connection seat 15 of the conductive connector 11 in the first insulating cavity 17.

[0076] On both sides of the battery pack body 6, there are respectively provided a seventh wiring terminal for providing low voltage (not shown in the figure), a high-voltage positive copper row 61 for providing high voltage positive, and / or a high-voltage negative copper row 62 for providing high voltage negative; the two first connectors 1 are respectively connected to both sides of the battery pack body. The wiring plug 2 of each first connector 1 on each side is inserted into the seventh wiring terminal, and the two first openings are sleeved on the high-voltage positive copper row 61 and / or the high-voltage negative copper row 62 on the same side of the battery pack body. The high-voltage positive copper row 61 and / or the high-voltage negative copper row 62 are in surface contact and conduction with the conductive connection seat 15 of the conductive connector 11 in the first insulating cavity 17.

[0077] In this embodiment, the first connectors 1 on both sides of the battery pack body are mechanically connected by a third connector 3. The second ends of the first connectors 1 on both sides of the battery pack body 5 are respectively on the first side of the third connector 3, and the first ends of the first connectors 1 on both sides of the battery pack body 6 are respectively inserted into the second side of a third connector 3 to ensure the independent electrical connection of the same attribute wiring terminals and guarantee the stability of the connection.

[0078] When installing the battery pack of the present invention, the battery pack body 5 and the battery pack body 6 are each combined with the first connector 1. First, the seventh wiring terminals on both sides of the battery pack body are respectively connected to a first connector 1, and then the first connector 1 is sleeved on the high-voltage positive copper busbar and the high-voltage negative copper busbar on both sides of the battery pack body and screwed to the conductive connection base 15 through bolts. Then, the battery pack body 5 with the first connector 1 is connected to the first side of the two third connectors 3, and the battery pack body 6 with the first connector 1 is connected to the second side of the two third connectors 3. Finally, after the first connectors 1 on both sides of the battery pack body 6 are connected to the fourth connector 4, it is installed on the preset installation surface through the fixing holes 44 of the fourth connector 4.

[0079] After the installation is completed, the seventh wiring terminal of the battery pack body 5 is electrically connected to the low-voltage wiring female terminal 32 of the third connector 3 through the wiring plug 2 of the first connector 1, and the low-voltage wiring female terminal 34 of the third connector 3 is electrically connected to the seventh wiring terminal of the battery pack of the battery pack body 6 through the wiring plug 2 of another first connector 1, so that the seventh wiring terminal of the battery pack body 5 is electrically connected to the seventh wiring terminal of the battery pack body 6.

[0080] The high-voltage positive copper busbar 51 of the battery pack body 5 is electrically connected to the high-voltage wiring male terminal 33 on the first side of the third connector 3 through the conductive connector 11 on the first side of the first connector 1, and the high-voltage wiring male terminal 35 of the third connector 3 is electrically connected to the high-voltage positive copper busbar 61 of the battery pack body 6 through the conductive connector 11 of another first connector 1, so that the high-voltage positive copper busbar 51 of the battery pack body 5 is electrically connected to the high-voltage positive copper busbar 61 of the battery pack body 6.

[0081] The high-voltage negative copper busbar 52 of the battery pack body 5 is electrically connected to the high-voltage wiring male terminal 33 on the second side of the third connector 3 through the conductive connector 11 on the second side of the first connector 1, and the high-voltage wiring male terminal 35 of the third connector 3 is electrically connected to the high-voltage negative copper busbar 62 of the battery pack body 6 through the conductive connector 11 of another first connector 1, so that the high-voltage negative copper busbar 52 of the battery pack body 5 is electrically connected to the high-voltage negative copper busbar 62 of the battery pack body 6.

[0082] And so on. Through the cooperation of multiple pairs of third connectors 3, all the battery pack bodies with the first connectors 1 can be connected together at one time. The third connector 3 not only provides mechanical connection of adjacent battery pack bodies, but also provides independent electrical connection of the same-type wiring terminals in the battery pack body. The high-low voltage scheme of the battery pack of the present invention has the advantages of high integration, convenient disassembly, and fast speed.

[0083] In summary, the purpose of the present invention is to provide a battery pack connection component, a battery pack module, and a battery pack, which are convenient and fast to install, can achieve rapid positioning, and greatly improve the stability of the power supply connection of the battery pack module.

[0084] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, which should all be regarded as falling within the protection scope of the present invention.

Claims

1. A battery pack connection component, characterized in that, include: At least one first connecting member, the first connecting member comprising: A second insulating cavity, wherein two end openings of the second insulating cavity are respectively provided with a plurality of first wiring terminals, and each of the first wiring terminals is respectively electrically connected to a first wiring terminal at the other end; a wiring plug-in, the wiring plug-in being electrically connected to each of the first wiring terminals in the second insulating cavity through a wiring harness; and Two first insulating cavities are integrally formed on both sides of the second insulating cavity, each of the first insulating cavities is provided with a conductive connector extending along a first direction, and both ends of each of the conductive connectors respectively form second wiring terminals exposed from the first insulating cavity, and the first end of each of the conductive connectors is provided with a conductive connection seat extending along a second direction and away from the second insulating cavity, and the conductive connection seat is integrally formed with the conductive connector, and at least one first opening is provided on one side of the first insulating cavity, and the third direction of the first opening is perpendicular to the plane defined by the first direction and the second direction, and the first opening forms a connection channel in contact with the surface of the conductive connection seat; Wherein, the first direction is based on the longitudinal direction of the drawing; the second direction is based on the transverse direction of the drawing; The first wiring terminals of the second insulating cavity are all low-voltage male wiring terminals, and the low-voltage male wiring terminals provide a plug-in direction along the first direction; The second wiring terminals of the first insulating cavity are all high-voltage female wiring terminals, and the high-voltage female wiring terminals provide a plug-in direction along the first direction; The second insulating cavity is provided with a second opening for the wiring harness to pass through, and the second opening and the first opening are located on the same side of the first connecting member.

2. The battery pack connection component according to claim 1, wherein The conductive connection seat has a connection hole with the first direction as the axial direction.

3. The battery pack connection component according to claim 1, characterized in that, Also includes at least one third connecting member; A third terminal and two fourth terminals are respectively provided on the first side and the second side opposite to the first side of the third connector. The third terminal and the fourth terminal on the first side of the third connector are respectively plugged in and conducted with the first terminal and the second terminal at the first end of the first connector; the third terminal and the fourth terminal on the second side of the third connector are respectively plugged in and conducted with the first terminal and the second terminal at the second end of another first connector; the third terminal is a low-voltage female connector, and the fourth terminal is a high-voltage male connector.

4. The battery pack connection assembly according to claim 3, wherein, Side walls surrounding the third connecting terminal and engaging with the opening of the second insulating cavity are respectively provided on both sides of the third connecting member.

5. The battery pack connection assembly according to claim 1, characterized in that, It also includes a fourth connector, one side of which is provided with a fifth terminal that is plugged into and connected to the first terminal at the second end of the first connector and a sixth terminal that is plugged into and connected to the second terminal at the second end, the fifth terminal is a low-voltage female connector, and the sixth terminal is a high-voltage male connector.

6. A battery pack module, characterized in that, It includes a battery pack body and the battery pack connection component as described in claim 1. On both sides of the battery pack body, there are respectively provided a seventh terminal for providing low voltage, an eighth terminal for providing high voltage positive electrode, and a ninth terminal for providing high voltage negative electrode; Two of the first connectors are respectively connected to both sides of the battery pack body. The wiring plug-ins of the first connectors on each side are inserted into the seventh terminal. Two of the first openings sleeved on the eighth terminal and the ninth terminal on the same side of the battery pack body. The eighth terminal and the ninth terminal are respectively in surface contact and conduction with the conductive connection seat surface of the conductive connection member in the first insulating cavity.

7. A battery pack, characterized in that, It includes at least n battery pack bodies stacked and connected along the first direction and the battery pack connection component as described in claim 3, where n≥2. Adjacent battery pack bodies are connected by two of the third connectors; On both sides of each battery pack body, there are respectively provided a seventh terminal for providing low voltage, an eighth terminal for providing high voltage positive electrode, and a ninth terminal for providing high voltage negative electrode; Two of the first connectors are respectively connected to both sides of the battery pack body. The wiring plug-ins of the first connectors on each side are inserted into the seventh terminal. Two of the first openings sleeved on the eighth terminal and the ninth terminal on the same side of the battery pack body. The eighth terminal and the ninth terminal are respectively in surface contact and conduction with the conductive connection seat surface of the conductive connection member in the first insulating cavity; The first ends of the first connectors on both sides of the battery pack body are respectively inserted into the second side of one of the third connectors, and the second ends of the first connectors on both sides of the adjacent other battery pack body are respectively on the first side of the third connector. The seventh terminals of the n battery packs are mutually conducted, the eighth terminals of the n battery packs are mutually conducted, and the ninth terminals of the n battery packs are mutually conducted.

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