Battery module and electric equipment

Abstract

The invention relates to the technical field of batteries, and discloses a battery module and electric equipment, and the battery module comprises a battery cell group, a first circuit board, a second circuit board, first electronic equipment, second electronic equipment, a first wire harness and a second wire harness. The battery cell group comprises a plurality of stacked battery cells; the first circuit board is used for charge and discharge management of the battery module, and the first circuit board and the battery cell group are arranged along a first direction. The second circuit board is separated from the first circuit board. The first electronic equipment and the battery cell group are arranged along a second direction, and the second direction is perpendicular to the first direction and the third direction. The first wire harness is electrically connected with the first electronic device and the second circuit board. The second wire harness is electrically connected with the first circuit board and the second circuit board. According to the scheme, the second circuit board is additionally arranged, when the first electronic equipment breaks down and needs to be maintained and checked, the first electronic equipment and the second circuit board can be disassembled for maintenance, and maintenance of the battery module is facilitated.

Description

Battery module and electrical equipment Technical Field

[0001] The embodiments of the present application relate to the technical field of batteries, and in particular to a battery module and an electrical device. Background Art

[0002] The battery module includes a circuit board (BMS) for battery charge and discharge management. The BMS board is electrically connected to electronic devices used for charging and discharging, or to electronic devices that communicate with the outside world. In related art, the placement of connectors is limited by the BMS board's location. Once the BMS board's location is determined, flexible connector placement is difficult.

[0003] Summary of the Invention

[0004] The main technical problem solved by the embodiments of the present application is to provide a battery module and electrical equipment that can facilitate the location arrangement of connectors.

[0005] To address the above technical issues, the present application adopts a technical solution: providing a battery module comprising a cell group, a first circuit board, a second circuit board, a first electronic device, a second electronic device, a first wiring harness, and a second wiring harness. The cell group comprises at least one cell. The first circuit board is used to manage the charge and discharge of the battery module and is arranged along a first direction with the cell group. The second circuit board is separated from the first circuit board. The first electronic device is arranged along a second direction with the cell group perpendicular to both the first and third directions. The first wiring harness is electrically connected to both the first electronic device and the second circuit board. The second wiring harness is electrically connected to both the first and second circuit boards. In this solution, a second circuit board is added. The first circuit board is used to manage the charge and discharge of the battery module and is separated from the first circuit board. The second circuit board is electrically connected to the first circuit board via the second wiring harness. The first electronic device is electrically connected to the first circuit board by being electrically connected to the second circuit board. When the first electronic device malfunctions and requires repair and inspection, the first electronic device and the second circuit board can be disassembled for inspection. This reduces the risk of damage to the first circuit board and electronic components during disassembly of the first circuit board and facilitates repair of the battery module.

[0006] In some embodiments, the second circuit board and the battery cell group are arranged along the first direction, or along a third direction perpendicular to both the first and second directions. In this embodiment, the second circuit board and the first circuit board are arranged perpendicularly to the battery cell group, separating the second circuit board from the first circuit board. This reduces the impact of disassembly and maintenance of the second circuit board on the first circuit board and improves maintenance efficiency.

[0007] In some embodiments, the battery pack has a first end edge and a second end edge facing each other along the second direction; the first electronic device is disposed on one side of the first end edge of the battery pack along the second direction. In this embodiment, the first electronic device is disposed at the first end edge, separating the first electronic device from the first and second circuit boards, thereby facilitating maintenance.

[0008] In some embodiments, the second wiring harness extends from the second circuit board to the second end edge along the second direction. The structure in which the second wiring harness extends to the second end edge allows the second wiring harness and the first wiring harness to extend in two diverging directions, respectively, thereby reducing mutual interference between the wiring harnesses. At the same time, since the first electronic device is located at the first end edge of the battery cell group, the positions at the first end edge and the second end edge of the battery cell group can be vacated for simultaneously arranging other components of the battery module. In this case, the extension of the second wiring harness toward the second end edge can reasonably utilize the space at the second end edge of the battery cell group.

[0009] In some embodiments, along the second direction, the distance between the second circuit board and the first end edge is L1, and the distance between the second circuit board and the second end edge is L2, where L1>L2. In this solution, L1>L2, which ensures a sufficient distance between the first electronic device and the second circuit board, allowing for sufficient space for the first wiring harness to be arranged, alleviating the problem of the first wiring harness being too short to facilitate the placement of the first electronic device.

[0010] In some embodiments, the battery cell group has a third end edge and a fourth end edge that are disposed opposite each other along the first direction, and the first circuit board is disposed adjacent to the third end edge of the battery cell group. In this embodiment, the first circuit board is separated from the first electronic device, thereby minimizing the impact on the first circuit board during disassembly of the first electronic device.

[0011] In some embodiments, the second circuit board and the battery cell assembly are arranged along the third direction. Along the first direction, the distance between the second circuit board and the third edge is L3, and the distance between the second circuit board and the fourth edge is L4, where L3 < L4. In this embodiment, L3 < L4, the second circuit board can be positioned closer to the first circuit board, thereby facilitating electrical connection of the second wiring harness between the first and second circuit boards.

[0012] In some embodiments, along the second direction, the second circuit board has a first side portion and a second side portion that are arranged relative to each other, and the second circuit board includes a first electrical connection portion and a second electrical connection portion; along the second direction, the first wiring harness is connected to the first electrical connection portion, and the distance between the first electrical connection portion and the first side portion is S1, and the distance between the first electrical connection portion and the second side portion is S2; along the second direction, the second wiring harness is connected to the second electrical connection portion, and the distance between the second electrical connection portion and the first side portion is S3, and the distance between the second electrical connection portion and the second side portion is S4; wherein S1 < S2; and / or S4 < S3. In this solution, since the first wiring harness extends toward the first end edge, the first wiring harness is connected to a portion of the second circuit board that is closer to the first side edge. This can match the layout position of the first wiring harness, save material for the first wiring harness, and facilitate the extension of the first wiring harness toward the first end edge of the battery cell group. And / or, since the second wiring harness extends toward the second end edge, the second wiring harness is connected to a portion of the second circuit board that is closer to the second side edge, which can match the layout position of the second wiring harness, save material for the second wiring harness, and facilitate the extension of the second wiring harness toward the second end edge of the battery cell group.

[0013] In some embodiments, the battery module further includes a second electronic device and a third wiring harness, the second electronic device is separated from the first electronic device, one end of the third wiring harness is electrically connected to the second electronic device, and the other end is electrically connected to the second circuit board. The second electronic device is arranged on one side of the first end of the battery cell group. In this solution, the battery module has at least two electronic devices (the two electronic devices are the first electronic device and the second electronic device), the first electronic device and the second electronic device are both electrically connected to the second circuit board, and the first electronic device and the second electronic device are both arranged on the same side of the battery cell group (i.e., on one side of the first end of the battery cell group), which can improve the space utilization of the battery module.

[0014] In some embodiments, when viewed along the second direction, the first electronic device at least partially overlaps with the second circuit board along the first direction.

[0015] In some embodiments, when viewed along the second direction, the second electronic device is spaced apart from the second circuit board along the first direction.

[0016] In some embodiments, the second circuit board further includes a third electrical connection portion, to which the third wiring harness is soldered. The closest distance between the third electrical connection portion and the first side portion is S5, and the closest distance between the third electrical connection portion and the second side portion is S6, where S5 is less than S6, meaning that the distance between the third electrical connection portion and the first side portion is closer than the distance between the third electrical connection portion and the second side portion. In this solution, the placement of the third electrical connection portion can further align with the extension direction of the third wiring harness, reducing material waste in the third wiring harness.

[0017] In some embodiments, the first electronic device includes a signal transmission module, and the second electronic device includes a connector configured for charging and discharging the battery pack.

[0018] In some embodiments, along the first direction, the second electronic device is disposed on a side of the first electronic device away from the first circuit board.

[0019] In some embodiments, the second circuit board further includes a fourth electrical connection portion, and the battery module further includes a fourth wiring harness, one end of the fourth wiring harness being welded to the fourth electrical connection portion and the other end extending to the second end edge; the fourth electrical connection portion is electrically connected to the third electrical connection portion. In this embodiment, a fourth wiring harness extending toward the second end edge is also provided to electrically connect to the second circuit board, so that circuits are led out on opposite sides of the second circuit board (the side closer to the first end edge and the side closer to the second end edge), thereby improving space utilization on the second circuit board.

[0020] In some embodiments, the battery module further includes a third electronic device, which is electrically connected to the end of the fourth wiring harness facing away from the second circuit board. In this solution, both the first electronic device located at the first end and the third electronic device located at the third end are electrically connected to the second circuit board. This results in a more organized wiring harness arrangement compared to prior art designs that lack a second circuit board.

[0021] In some embodiments, the closest distance between the fourth electrical connection portion and the first side portion is S7, and the closest distance between the fourth electrical connection portion and the second side portion is S8, S7>S8, that is, the distance between the fourth electrical connection portion and the second side portion is closer than the distance between the fourth electrical connection portion and the first side portion, so that the extension direction of the fourth wiring harness can be matched and the waste of material of the fourth wiring harness can be reduced.

[0022] In some embodiments, the second circuit board and the battery cell group are arranged along a third direction; along the first direction, the size of the second circuit board is H1, and the size of the battery cell group is H2, H1<H2, that is, along the first direction, the size of the second circuit board is smaller than the size of the battery cell group, which can reduce the space occupied by the second circuit board and also facilitate the position arrangement of the second circuit board.

[0023] In some embodiments, the second circuit board and the battery cell group are arranged along a third direction; when viewed from the third direction, the second circuit board is located within the battery cell group. In this embodiment, the second circuit board does not occupy additional space in the battery module along the first direction, thereby improving space utilization within the battery module.

[0024] In some embodiments, the first wiring harness and the second circuit board are detachably connected or welded. In this embodiment, when the first wiring harness and the second circuit board are detachably connected, assembly efficiency can be improved. When the first wiring harness and the second circuit board are welded, the reliability of the connection between the first wiring harness and the second circuit board can be improved.

[0025] In some embodiments, the battery module further comprises a first housing and a second housing, wherein the first housing is disposed outside the battery cell assembly; the second housing is disposed outside the first housing; and the first circuit board is disposed within the first housing. In this embodiment, disposing the first circuit board within the first housing further protects the first circuit board and reduces the risk of damage to the first circuit board during battery module maintenance.

[0026] In some embodiments, the second circuit board is disposed between the first housing and the second housing. In this solution, the second circuit board is disposed between the first housing and the second housing to facilitate maintenance of the second circuit board.

[0027] In some embodiments, the second circuit board is connected to the first housing. Compared with the case where the second circuit board is connected to the second housing, this solution can effectively reduce the chance of damaging the cable connected to the second circuit board when disassembling the first housing.

[0028] In some embodiments, a first recess is provided on a wall of the first housing facing the second housing, and the second circuit board is provided in the first recess. In this solution, the structure of the first recess can enhance the protection effect on the second circuit board.

[0029] In some embodiments, a first connecting portion is further provided between the first housing and the second housing. The first connecting portion is connected to the first housing. The first connecting portion and the first recessed portion together define a housing cavity, and the second circuit board is disposed in the housing cavity. In this embodiment, the first connecting portion and the first recessed portion define a relatively closed housing cavity, which can further enhance the protection of the second circuit board.

[0030] In some embodiments, the first connecting portion includes a transparent area that at least partially overlaps with the second circuit board when viewed along the third direction; or the first connecting portion is made of a transparent material. In this embodiment, the first connecting portion includes at least a partially transparent portion that faces the second circuit board, thereby enabling an operator to observe the status of components on the second circuit board without removing the second circuit board, facilitating maintenance of the second circuit board.

[0031] In some embodiments, the battery module further includes an insulating portion that wraps the second circuit board. In this solution, wrapping the second circuit board with the insulating portion can further protect the second circuit board.

[0032] In some embodiments, the insulating portion is made of a transparent material. In this solution, an operator can observe the status of components on the second circuit board without removing the second circuit board, which facilitates maintenance of the second circuit board.

[0033] In some embodiments, the insulating portion is made of silicone gel. In this solution, the insulating portion can be removed from the insulating portion when the second circuit board needs to be repaired, thereby facilitating repair of the second circuit board.

[0034] In some embodiments, the first connecting portion is provided with a first opening, the first opening being in communication with the accommodating cavity. In this solution, the provision of the first opening facilitates the introduction of the insulating portion into the accommodating cavity.

[0035] In some embodiments, the wall surface of the first connection portion facing the second shell is provided with a second recess, and the second recess is provided with a first opening facing the bottom wall of the second shell. In this solution, the structure of providing the second recess can facilitate sealing the first opening.

[0036] In some embodiments, the first connecting portion includes an inner wall surface facing the accommodating cavity, the inner wall surface being provided with a rib plate, the rib plate enclosing a plurality of grid slots, the rib plate being provided with a second opening, the second opening being conductive to each grid slot. In this embodiment, the second opening facilitates the insulating portion to fill each grid slot.

[0037] In some embodiments, the second opening extends to the inner wall surface in a direction perpendicular to the inner wall surface. In this solution, the injection amount of the insulating part in the accommodating cavity can be further increased.

[0038] In some embodiments, a protrusion is provided on the wall of the first shell facing the second shell, and the protrusion encloses the first recess. In this solution, the protrusion is used to enclose the first recess, which can reduce the wall thickness of the first shell and reduce the space occupied by the first shell.

[0039] In some embodiments, the second circuit board and the battery cell group are arranged along a third direction, the first shell has a first wall, and the second circuit board is connected to the first wall of the first shell. Along the second direction, the first shell has a second wall and a third wall arranged opposite each other, the second wall and the third wall edges are respectively located on both sides of the first wall, and the second wall is provided on the side of the battery cell group where the first electronic device is provided. The first wall is provided with a first recess, and the first recess extends to the junction of the third wall and the first wall. In this solution, it is possible to facilitate the extension of the second wiring harness toward the second end edge of the battery cell group.

[0040] In some embodiments, the first recess includes a first portion located on the first wall surface and a second portion located on the third wall surface, the first portion communicating with the second portion, and the second wiring harness extends from the first portion to the second portion within the first recess. In this embodiment, the second wiring harness can be further extended toward the second end edge of the battery cell group.

[0041] In some embodiments, along a first direction, the first housing has a fourth wall and a fifth wall disposed opposite each other, and the first circuit board is disposed between the fourth wall and the battery cell assembly. The second portion is spaced a minimum distance L5 from the fourth wall and a minimum distance L6 from the fifth wall, where L5 < L6. This facilitates the extension of the second wiring harness toward the first circuit board.

[0042] In some embodiments, the second circuit board includes electronic components, which are used for battery charge and discharge management. In this solution, the number of electronic components on the first circuit board can be reduced, thereby reducing the processing cost and difficulty of the first circuit board.

[0043] A second aspect of the present application further provides an electrical device comprising any of the above-mentioned battery modules.

[0044] The battery module in this application is equipped with a second circuit board. The first circuit board is used to manage the charge and discharge of the battery module. The second circuit board is separated from the first circuit board and electrically connected to the first circuit board using a second wiring harness. The first electronic device is electrically connected to the first circuit board by being electrically connected to the second circuit board. When the first electronic device fails and needs to be repaired and inspected, the first electronic device and the second circuit board can be disassembled for inspection. This reduces the risk of damage to the first circuit board and the electronic components on the battery module during disassembly, and facilitates the repair of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on the drawings.

[0046] FIG1 is a perspective schematic diagram of a battery module provided by a first embodiment of the present application from a first viewing angle;

[0047] FIG2 is a perspective schematic diagram of a battery module provided by the first embodiment of the present application from a second viewing angle;

[0048] FIG3 is an exploded schematic diagram of a battery module provided in the first embodiment of the present application;

[0049] FIG4 is a perspective schematic diagram of the battery module provided by the first embodiment of the present application with the second housing removed from the first viewing angle;

[0050] FIG5 is a schematic side view of the battery module provided by the first embodiment of the present application with the second housing removed, viewed along direction Z;

[0051] FIG6 is a side view schematically illustrating the combination of the second circuit board, the first wiring harness, the second wiring harness, the third wiring harness, and the fourth wiring harness, as viewed along direction Z, according to the first embodiment of the present application; ends of the first wiring harness, the second wiring harness, the third wiring harness, and the fourth wiring harness facing away from the second circuit board are omitted;

[0052] FIG7 is a schematic side view of the second circuit board in the battery module provided by the first embodiment of the present application, viewed along direction Z;

[0053] FIG8 is a schematic side view of the battery module provided by the first embodiment of the present application with the second housing removed, viewed in the opposite direction of direction Y;

[0054] FIG9 is a schematic side view of the battery module provided by the first embodiment of the present application with the second housing removed, viewed along direction Y;

[0055] FIG10 is a schematic side view of the battery module provided by the first embodiment of the present application with the second housing removed, viewed in the direction opposite to direction Z;

[0056] FIG11 is a schematic side view of the battery module provided by the first embodiment of the present application with the second housing removed, viewed in the direction opposite to direction X;

[0057] FIG12 is a schematic side view of the battery module provided by the first embodiment of the present application with the second housing removed, as viewed along direction X;

[0058] FIG13 is a perspective schematic diagram of a battery cell of a battery module provided in the first embodiment of the present application;

[0059] FIG14 is a first side view schematic diagram of a battery cell of a battery module provided in the first embodiment of the present application;

[0060] FIG15 is a second side view schematic diagram of a battery cell of a battery module provided in the first embodiment of the present application;

[0061] FIG16 is a perspective schematic diagram of the battery module provided by the first embodiment of the present application with the first shell and the second shell removed from the first perspective;

[0062] FIG17 is a schematic side view of the battery module provided by the first embodiment of the present application, with the first shell and the second shell removed, as viewed along direction Z;

[0063] FIG18 is a schematic side view of the battery module provided by the first embodiment of the present application, with the first shell and the second shell removed, as viewed along direction Y;

[0064] FIG19 is a schematic side view of the battery module provided by the first embodiment of the present application, with the first shell and the second shell removed, as viewed along direction X;

[0065] FIG20 is a schematic side view of the battery module provided by the first embodiment of the present application, with the first shell and the second shell removed, viewed in the direction opposite to direction Z;

[0066] FIG21 is a schematic side view of the battery module provided by the first embodiment of the present application, with the first shell and the second shell removed, viewed in the opposite direction of direction Y;

[0067] FIG22 is a schematic side view of the battery module provided by the second embodiment of the present application, with the first shell and the second shell removed, as viewed along direction Z;

[0068] FIG23 is a schematic side view of the battery module provided by the third embodiment of the present application, with the first shell and the second shell removed, as viewed along direction Z;

[0069] FIG24 is a schematic side view of the battery module provided by the fourth embodiment of the present application, with the first shell and the second shell removed, as viewed along direction Z;

[0070] FIG25 is a schematic side view of the first housing and its internal components in the battery module provided by the first embodiment of the present application, viewed along direction Z;

[0071] FIG26 is a perspective schematic diagram of the first housing and its internal components in the battery module provided by the first embodiment of the present application;

[0072] FIG27 is a partial enlarged schematic diagram of point A in FIG26;

[0073] FIG28 is a perspective schematic diagram of the combination of the first connecting portion, the first housing, and the internal components thereof in the battery module provided by the first embodiment of the present application;

[0074] FIG29 is a partial enlarged schematic diagram of point B in FIG28;

[0075] FIG30 is a perspective schematic diagram of a first connecting portion of a battery module provided by the first embodiment of the present application from a first viewing angle;

[0076] FIG31 is a perspective schematic diagram of the first connecting portion of the battery module provided by the first embodiment of the present application from a second viewing angle;

[0077] FIG32 is a partial enlarged schematic diagram of point C in FIG31;

[0078] FIG33 is a perspective schematic diagram of the first connecting portion of the battery module provided by the first embodiment of the present application from a third viewing angle;

[0079] FIG34 is a full cross-sectional schematic diagram of the battery module provided by the first embodiment of the present application, with the second housing removed, viewed in the direction opposite to direction X;

[0080] FIG35 is a partial enlarged schematic diagram of point D in FIG34;

[0081] FIG36 is a partial cross-sectional schematic diagram of the battery module provided by the first embodiment of the present application, with the second housing removed, viewed in the direction opposite to direction Y;

[0082] FIG37 is a partial enlarged schematic diagram of point E in FIG36;

[0083] FIG38 is a partial enlarged schematic diagram of point F in FIG37;

[0084] FIG39 is a perspective schematic diagram of the second wiring harness, connector, and buffer assembly in the battery module provided by the first embodiment of the present application;

[0085] FIG40 is a perspective schematic diagram of a connector and a buffer assembly in a battery module provided in the first embodiment of the present application;

[0086] FIG41 is an exploded schematic diagram of the combination of connectors and buffer components in the battery module provided in the first embodiment of the present application. DETAILED DESCRIPTION

[0087] In order to facilitate the understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or there can be one or more intermediate elements therebetween. When an element is described as being "connected to" another element, it can be directly connected to the other element, or there can be one or more intermediate elements therebetween. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this specification are for illustrative purposes only. If the terms "equal", "same", "equal to", "same" and the like are used in this specification to express the magnitude relationship between two numerical values, it should be considered that the two numerical values ​​can have a numerical deviation of ±10%. For example, when describing "λ is equal to 100", the actual numerical value of λ can be 90 to 110.

[0088] Unless otherwise defined, all technical and scientific terms used in this specification have the same meanings as those commonly understood by those skilled in the art to which this application belongs. The terms used in this specification and in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" as used in this specification includes any and all combinations of one or more of the relevant listed items.

[0089] The battery module includes a circuit board (BMS) for battery charge and discharge management. The BMS board is electrically connected to electronic devices used for charging and discharging, or electronic devices that communicate with the outside world (collectively referred to as connectors). In related art, the placement of connectors is limited by the placement of the BMS board. Once the BMS board is positioned, flexible connector placement is difficult.

[0090] In view of this, referring to Figures 1-41 , this embodiment provides a battery module 1. Specifically referring to Figures 13-24 , the battery module 1 includes a cell group 10, a first circuit board 20, a second circuit board 30, a first electronic device 41, a second electronic device 42, a first wiring harness 91, and a second wiring harness 92.

[0091] Referring to Figures 13-16, the battery cell assembly 10 includes at least one battery cell 17. Each battery cell 17 includes a main body 172 and an electrode terminal 171, which extends from the main body 172. The electrode terminal 171 includes a positive terminal 171a and a negative terminal 171b. The main body 172 of the battery cell 17 comprises a battery housing, an electrode assembly, and an electrolyte, which are housed within the housing. The electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator, which is disposed between the positive and negative electrode sheets. The battery cell 17 primarily operates by the movement of metal ions between the positive and negative electrode sheets. One end of the electrode terminal 171 extends outside the battery housing and is used to electrically connect to an external circuit. The other end of the electrode terminal 171 extends into the housing and is used to electrically connect to the electrode assembly. The electrode terminal 171 is used to electrically connect the electrode assembly to an external circuit, enabling charging and discharging of the battery cell 17. In some embodiments, the battery cell 17 includes a first surface 1701 and a second surface 1702. The first surface 1701 and the second surface 1702 are two surfaces arranged opposite to each other along the second direction Y of the battery cell 17. The electrode terminal 171 extends out of the battery cell shell along the first direction X. The first direction X and the second direction Y are perpendicular to each other. The second direction Y is the stacking direction of each battery cell 17.

[0092] Exemplarily, the cell housing is made of an aluminum-plastic film. The cell 17 can be a lithium-ion cell, a sodium-lithium-ion cell, a sodium-ion cell, a magnesium-ion cell, or other type of cell, which is not limited in this embodiment of the present application. Optionally, the cell 17 is a soft-pack cell.

[0093] The number of battery cells 17 is not limited in this embodiment, and the number of battery cells 17 can be one, two, or more than two. When the number of battery cells 17 is two or more, each battery cell 17 can be arranged in a single direction, or in two directions that intersect each other (specifically, they can be perpendicular). Multiple battery cells 17 can be connected in series, in parallel, or in mixed connection, where mixed connection simply means that the connection of each battery cell 17 includes series connection and parallel connection. Optionally, when each battery cell 17 is arranged in a single direction, the second side 1702 of the first battery cell 17 located at the front end of the battery cell group 10 abuts against the first side 1701 of the adjacent second battery cell 17, and the second side 1702 of the second battery cell 17 abuts against the first side 1701 of the adjacent third battery cell 17, and multiple battery cells 17 are arranged in this manner to form a battery cell group 10. Wherein, the arrangement direction of each battery cell 17 in the battery cell group 10 is the same as the second direction Y. Regardless of whether the battery cells 17 are arranged in a single direction or in two intersecting directions, the electrode terminals 171 of each battery cell 17 can extend toward the same side or different sides of the battery cell group 10. The shape and structure of the battery cells 17 are not limited in this embodiment. They can be roughly regular rectangular parallelepiped or cylindrical, etc., or they can also have other special-shaped structures. For ease of description, the following embodiments are exemplified by a structure in which the battery cell group 10 includes a plurality of battery cells 17 arranged in a single direction, and the electrode terminals 171 of each battery cell 17 extend toward the same side of the battery cell group 10.

[0094] The first circuit board 20 can be used for charging and discharging management of the battery module 1. The first circuit board 20 can protect and manage the battery module 1 when the battery module 1 is charging or discharging. The first circuit board 20 can have at least one of the functions of overcharge protection, over-discharge protection, charging overcurrent protection, discharging overcurrent protection, short circuit protection, temperature protection or voltage balancing. The first circuit board 20 can collect information such as the voltage, current, temperature or capacity of the battery cell 17 in real time. Referring to Figures 13-16, in one embodiment, the first circuit board 20 and the battery cell group 10 are arranged along the first direction X. The first circuit board 20 can be arranged on one side of the battery cell group 10. In order to facilitate the electrical connection between the first circuit board 20 and the electrode terminals 171 of each battery cell 17 on the battery cell group 10, the first circuit board 20 can be arranged on the side where the electrode terminals 171 of the battery cell group 10 extend. In another embodiment, in order to meet other needs, the first circuit board 20 can also be arranged on other sides of the battery cell group 10. The first direction X is defined by the arrangement positions of the cell group 10 and the first circuit board 20 . That is, no matter which side of the cell group 10 the first circuit board 20 is arranged, the direction from the first circuit board 20 to the cell group 10 is defined as the first direction X used as a reference.

[0095] For ease of description, this application uses the first direction X as a reference and defines a second direction Y that is perpendicular to the first direction X, and a third direction Z that is perpendicular to both the first direction X and the second direction Y. That is, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. Referring to FIG. 16 , in one embodiment, the second direction Y is the stacking direction of the battery cells 17.

[0096] 17-21 , the cell group 10 includes a plurality of cells 17 stacked in a single direction. The cell group 10 has six end edges, and each end edge of the cell group 10 is defined as follows: the cell group 10 has a first end edge 11, a second end edge 12, a third end edge 13, a fourth end edge 14, a fifth end edge 15, and a sixth end edge 16. The first end edge 11 is arranged opposite the second end edge 12, and the first end edge 11 and the second end edge 12 are relatively distributed along the second direction Y. The third end edge 13 and the fourth end edge 14 are arranged opposite each other, and the third end edge 13 and the fourth end edge 14 are relatively distributed along the first direction X. The fifth end edge 15 and the sixth end edge 16 are arranged opposite each other, and the fifth end edge 15 and the sixth end edge 16 are relatively distributed along the third direction Z.

[0097] The relative positional relationship between the above-mentioned end edges and the battery cells 17 in the battery cell group 10 can be determined according to actual needs. The electrode terminal 171 of each battery cell 17 can extend from the first end edge 11 of the battery cell group 10, or can extend from the second end edge 12 or other end edges of the battery cell group 10. For ease of understanding, the present application defines an example in which the electrode terminal 171 of each battery cell 17 extends from the third end edge 13 of the battery cell group 10. When the first circuit board 20 is arranged on the side of the lead-out electrode terminal 171 of the battery cell group 10, the first circuit board 20 is arranged on one side of the third end edge 13 of the battery cell group 10.

[0098] In some embodiments, when viewed along the third direction Z, the second circuit board 30 has a first edge 3011 and a second edge 3012 oppositely disposed in the second direction Y, and has a third edge 3013 and a fourth edge 3014 oppositely disposed in the first direction X. Along the second direction Y, the third edge 3013 is located between the first edge 3011 and the second edge 3012, and the fourth edge 3014 is located between the first edge 3011 and the second edge 3012. For ease of description, the edge of the second circuit board 30 in the second direction Y that is closest to the first electronic device 41 is referred to as the first edge 3011, the other edge of the second circuit board 30 in the second direction Y is referred to as the second edge 3012, the edge of the second circuit board 30 in the first direction X that is closest to the electrode terminals 171 of each battery cell 17 is referred to as the third edge 3013, and the other edge of the second circuit board 30 in the first direction X is referred to as the fourth edge 3014.

[0099] In one embodiment, the second circuit board 30 is separated from the first circuit board 20. The first circuit board 20 and the second circuit board 30 are not two areas on the same circuit board. The first end of the second wiring harness 92 is electrically connected to the first circuit board 20, and the second end of the second wiring harness 92 is electrically connected to the second circuit board 30, thereby achieving an electrical connection between the second circuit board 30 and the first circuit board 20. The first circuit board 20 and the second circuit board 30 are positioned apart from each other, and the electrical connection between the two is achieved through the second wiring harness 92. Optionally, the first circuit board 20 and the second circuit board 30 can achieve signal transmission through the second wiring harness 92. Optionally, the first circuit board 20 and the second circuit board 30 can achieve power transmission through the second wiring harness 92.

[0100] In some embodiments, as shown in FIG17 , the second circuit board 30 is approximately rectangular when viewed along the third direction Z. The length of the second circuit board 30 in the first direction X is H1, and the length of the second circuit board 30 in the second direction Y is h1. That is, the distance between the third edge 3013 and the fourth edge 3014 in the first direction X is H1, and the distance between the first edge 3011 and the second edge 3012 in the second direction Y is h1, satisfying H1 ≥ h1 or H1 ≤ h1. In this embodiment, the length H1 of the second circuit board 30 in the first direction X is greater than the length h1 of the second circuit board 30 in the second direction Y. This facilitates the placement of more connectors or wiring harnesses between the first edge 3011 and the second edge 3012, thereby achieving electrical connections between the second circuit board 30 and other components.

[0101] The relative position of the second circuit board 30 and the cell group 10 can be determined based on actual needs. For example, the second circuit board 30 can be arranged along the first direction X with the cell group 10, and the second circuit board 30 can be located on the same side of the cell group 10 as the first circuit board 20. For example, the second circuit board 30 and the first circuit board 20 can both be located on the third edge 13 of the cell group 10, which facilitates connection between the first circuit board 20 and the second circuit board 30. Alternatively, the second circuit board 30 can be located on the fifth edge 15 of the cell group 10, or / and the first circuit board 20 can be located on the sixth edge 16 of the cell group 10, which facilitates reducing interaction between electronic components on the first circuit board 20 and the second circuit board 30. Optionally, the second circuit board 30 can be arranged along the third direction Z with the cell group 10, and the second circuit board 30 can be located on either side of the cell group 10 along the third direction Z, which facilitates reducing interaction between electronic components on the first circuit board 20 and the second circuit board 30, and facilitates connection between the first circuit board 20 and the second circuit board 30. Optionally, the second circuit board 30 is disposed on a side of the cell group 10 opposite to the first circuit board 20. For example, when the first circuit board 20 is disposed on the side of the third end 13 of the cell group 10, the second circuit board 30 can be disposed on the side of the fourth end 14 of the cell group 10. In one embodiment, the second circuit board 30 and the cell group 10 are arranged along the first direction X, and the second circuit board 30 is disposed on the side of the cell group 10 opposite to the first circuit board 20. That is, when the first circuit board 20 is disposed on the side of the third end 13 of the cell group 10, the second circuit board 30 can be disposed on the side of the fourth end 14 of the cell group 10. In another embodiment, referring to Figures 17-21, the second circuit board 30 and the cell group 10 are arranged along the third direction Z. That is, when the first circuit board 20 is disposed on the side of the third end 13 of the cell group 10, the second circuit board 30 can be disposed on the side of the fifth end 15 or the side of the sixth end 16 of the cell group 10.

[0102] The first electronic device 41 can also be arranged in a different orientation from the first circuit board 20. In one embodiment, the first electronic device 41 can be arranged along the second direction Y with the cell group 10, and the first electronic device 41 can be arranged on the first end side 11 or the second end side 12 of the cell group 10. In another embodiment, the first electronic device 41 can also be arranged along the third direction Z with the cell group 10, and the first electronic device 41 can be arranged on the fifth end side 15 or the sixth end side 16 of the cell group 10. In one embodiment, the first electronic device 41 can be arranged on the sixth end side 16 of the cell group 10 opposite the second circuit board 30.

[0103] The first electronic device 41 can be a device that communicates signals between the battery module 1 and the outside world. Specifically, it can be a communication device for wired or wireless communication with the outside world, a charging interface or plug, a discharging interface or plug, an indicator light or display screen for signal indication, etc. In one embodiment, the first electronic device 41 and the battery cell assembly 10 are arranged along the second direction Y. This helps to keep the first electronic device 41 away from the first circuit board 20, thereby reducing signal interference between the first electronic device 41 and the first circuit board 20. It also helps to keep the first electronic device 41 away from the second circuit board 30, thereby reducing signal interference between the first electronic device 41 and the second circuit board 30, and facilitating more layout space for the second circuit board 30.

[0104] Referring to Figures 17-21, in one embodiment, the first circuit board 20 is disposed on the side of the third end edge 13 of the battery cell group 10, the second circuit board 30 is disposed on the side of the fifth end edge 15 of the battery cell group 10, and the first electronic device 41 is disposed on the side of the first end edge 11 of the battery cell group 10. The second wiring harness 92 extends from the second circuit board 30 to the side of the second end edge 12. The second wiring harness 92 extends away from the first electronic device 41. This reduces mutual interference between the second wiring harness 92 and the first wiring harness 91, and the wiring harness layout is more regular.

[0105] In the related art, the first electronic device 41 and the BMS board are electrically connected using a wiring harness (similar to the first electronic device 41 and the first circuit board 20 being electrically connected using a wiring harness in the present application). Differently, in one embodiment, the first electronic device 41 and the second circuit board 30 are electrically connected using a first wiring harness 91, thereby achieving an electrical connection between the first electronic device 41 and the first circuit board 20, and further achieving signal transmission between the first electronic device 41 and the first circuit board 20. In another embodiment, the first electronic device 41 and the second circuit board 30 are electrically connected using the first wiring harness 91, and signal transmission only occurs between the first electronic device 41 and the second circuit board 30, and no signal transmission occurs between the first electronic device 41 and the first circuit board 20.

[0106] A second circuit board 30 is newly added in this application. When the position of the first circuit board 20 is fixed, the layout position of the second circuit board 30 can be adjusted to facilitate the layout of the first electronic device 41, and the layout position of the first electronic device 41 is more flexible. The applicant also found that in the related art, when the BMS board is welded to the electrode terminals of each battery cell in the battery module, the maintenance process of the BMS board also causes the electrode terminals to become desoldered. After the electrode terminals become desoldered, the battery cell group needs to be completely disassembled and then re-soldered (the desoldered electrode terminals need to be re-soldered). On the one hand, this maintenance process is extremely troublesome, and on the other hand, this maintenance process is prone to cause secondary damage to the BMS board. In summary, the battery module in the prior art has the problem of troublesome maintenance. In this application, the first circuit board 20 is used to manage the charge and discharge of the battery module 1. The second circuit board 30 is separated from the first circuit board 20, and the two are electrically connected using a second wiring harness 92. The first electronic device 41 is electrically connected to the first circuit board 20 by being electrically connected to the second circuit board 30. When the first electronic device 41 malfunctions and requires repair and inspection, only the first electronic device 41 and the second circuit board 30 need to be disassembled for inspection, without the need to disassemble or inspect the first circuit board 20. This reduces the risk of damage to the first circuit board 20 and its electronic components during disassembly or inspection, facilitating repair of the battery module 1. Furthermore, since the second circuit board 30 does not need to be equipped with numerous electronic components, the risk of damage during disassembly and inspection is low, making repair more convenient.

[0107] Referring to Figures 17-21, in one embodiment, L1 is defined as the distance between the first edge 3011 of the second circuit board 30 and the first end edge 11 along the second direction Y, and L2 is defined as the distance between the second edge 3012 of the second circuit board 30 and the second end edge 12 along the second direction Y, satisfying L2 < L1. In this solution, the second circuit board 30 is closer to the second end edge 12 than to the first end edge 11, making it easier to position electronic devices at the second end edge 12.

[0108] In one embodiment, when the second circuit board 30 and the battery cell group 10 are arranged along the third direction Z, and the second circuit board 30 is arranged on the side of the fifth end edge 15 of the battery cell group 10, L3 is defined as the distance between the third edge 3013 of the second circuit board 30 and the third end edge 13 along the first direction X, and L4 is the distance between the fourth edge 3014 of the second circuit board 30 and the fourth end edge 14 along the first direction X, where L3 < L4. In this solution, the second circuit board 30 is closer to the third end edge 13, which facilitates the placement of electronic equipment at the location of the third end edge 13. The second circuit board 30 can also be arranged closer to the first circuit board 20, which facilitates the electrical connection of the second wiring harness 92 between the first circuit board 20 and the second circuit board 30. In this embodiment, when viewed from the third direction Z, the second circuit board 30 is located between the third electronic device 43 and the first electronic device 41. The first electronic device 41 and the second electronic device 42 are both located at the first end 11 of the battery cell group 10, and the third electronic device 43 is located at the second end 12 of the battery cell group 10. The first electronic device 41 and the second electronic device 42 are both arranged opposite the third electronic device 43 in the second direction Y. Along the second direction Y, the distance from the third electronic device 43 to the second edge 3012 of the second circuit board 30 is less than the distance from the first electronic device 41 (or the second electronic device 42) to the first edge 3011 of the second circuit board 30.

[0109] Referring to Figures 21-22, in one embodiment, as viewed from the third direction Z, the second circuit board 30 can also be located in the middle of the fifth edge 15 of the cell group 10 along the second direction Y. That is, the distance L1 between the second circuit board 30 and the first edge 11 is equal to the distance L2 between the second circuit board 30 and the second edge 12. In this case, along the first direction X, the distance L3 between the second circuit board 30 and the third edge 13 is less than the distance L4 between the second circuit board 30 and the fourth edge 14. As viewed from the third direction Z, the second circuit board 30 is located between the third electronic device 43 and the first electronic device 41. The first electronic device 41 and the second electronic device 42 are both located at the first edge 11 of the cell group 10, and the third electronic device 43 is located at the second edge 12 of the cell group 10. The first electronic device 41 and the second electronic device 42 are both positioned opposite the third electronic device 43 in the second direction Y. Along the second direction Y, the distance from the third electronic device 43 to the second edge 3012 of the second circuit board 30 is equal to the distance from the first electronic device 41 (or the second electronic device 42) to the first edge 3011 of the second circuit board 30.

[0110] Referring to FIG. 23 , in one embodiment, along the second direction Y, the second circuit board 30 may also be located near the first edge 11 of the cell group 10, with the distance L1 between the second circuit board 30 and the first edge 11 being less than the distance L2 between the second circuit board 30 and the second edge 12. In this case, along the first direction X, the distance L3 between the second circuit board 30 and the third edge 13 is less than the distance L4 between the second circuit board 30 and the fourth edge 14. Viewed from the third direction Z, the second circuit board 30 is located between the third electronic device 43 and the first electronic device 41. Both the first electronic device 41 and the second electronic device 42 are located at the first edge 11 of the cell group 10, and the third electronic device 43 is located at the second edge 12 of the cell group 10. The first electronic device 41 and the second electronic device 42 are positioned opposite the third electronic device 43 in the second direction Y. Along the second direction Y, the distance between the third electronic device 43 and the second edge 3012 of the second circuit board 30 is greater than the distance between the first electronic device 41 (or the second electronic device 42) and the first edge 3011 of the second circuit board 30.

[0111] 6-7 , the first wiring harness 91 electrically connects the first electronic device 41 and the second circuit board 30, respectively. The second circuit board 30 may include a first surface 301 and a second surface 302, with the first surface 301 and the second surface 302 arranged opposite each other. Alternatively, the first surface 301 of the second circuit board 30 may face the battery cell group 10, while the second surface 302 of the second circuit board 30 faces away from the battery cell group 10. The first wiring harness 91 is electrically connected to the second surface 302 of the second circuit board 30. In one embodiment, the first wiring harness 91 includes a first conductor 911 and two first connecting devices 912 located at either end of the first conductor 911. The first end of the first conductor 911 is electrically connected to one of the first connecting devices 912, which is electrically connected to the first electronic device 41. The second end of the first conductor 911 is electrically connected to the other first connecting device 912, which is electrically connected to the second circuit board 30. In another embodiment, the battery module 1 further includes two first plug-in devices 913, one of which is welded to the second circuit board 30, and the other is connected to the first electronic device 41, so that the first wiring harness 91 is detachably electrically connected to the first electronic device 41 and the second circuit board 30, respectively. Optionally, the first connecting device 912 includes a connector. Optionally, the first plug-in device 913 includes a connector.

[0112] The second wiring harness 92 is electrically connected to the first circuit board 20 and the second circuit board 30, respectively. In one embodiment, the second wiring harness 92 includes a second wire 921 and two second connecting devices 922 located at either end of the second wire 921. One end of the second wire 921 is electrically connected to one of the second connecting devices 922, which is electrically connected to the first circuit board 20. The other end of the second wire 921 is electrically connected to the other second connecting device 922, which is electrically connected to the second circuit board 30. In another embodiment, the battery module 1 also includes two second plugging devices 923, one of which is soldered to the second circuit board 30, and the other of which is soldered to the first circuit board 20. The two second connecting devices 922 are plugged into the two second plugging devices 923 in a one-to-one correspondence, electrically connecting the second wiring harness 92 to the first circuit board 20 and the second circuit board 30, respectively. Optionally, the second connecting device 922 comprises a connector. Optionally, the second plugging device 923 comprises a connector.

[0113] When viewed along the third direction Z, the first wiring harness 91 and the second wiring harness 92 may be connected to the second circuit board 30 at the same side or different sides of the second circuit board 30. In some embodiments, the first wiring harness 91 and the second wiring harness 92 are connected to the second circuit board 30 at different sides of the second circuit board 30. The first wiring harness 91 and the second wiring harness 92 are arranged opposite each other along the second direction Y. The first connecting device 912 and the second connecting device 922 overlap along the second direction Y. This facilitates full utilization of the installation space of the second circuit board 30. The surface area of ​​the second circuit board 30 for component installation is compact, which helps reduce the size of the second circuit board 30 in the first direction X.

[0114] In some embodiments, referring to Figures 6-7, the second circuit board 30 has a first side portion 31 and a second side portion 32 that are arranged opposite each other along the second direction Y. The first side portion 31 is a wall portion of the second circuit board 30 located at the first edge 3011 and extending along the thickness direction of the second circuit board 30. The second side portion 32 is a wall portion of the second circuit board 30 located at the second edge 3012 and extending along the thickness direction of the second circuit board 30. The first side portion 31 and the second side portion 32 are arranged opposite each other and are arranged along the second direction Y.

[0115] The second circuit board 30 includes a first electrical connection portion 33 and a second electrical connection portion 34. Both the first electrical connection portion 33 and the second electrical connection portion 34 are structures such as solder pads or solder holes on the second circuit board 30 for electrically connecting to external components outside the second circuit board 30. The first wiring harness 91 is electrically connected to the first electrical connection portion.

[0116] Referring to Figure 7 , along the second direction Y, the first wiring harness 91 is electrically connected to the first electrical connection portion 33. The distance between the first electrical connection portion 33 and the first side portion 31 is S1, and the distance between the first electrical connection portion 33 and the second side portion 32 is S2. Specifically, along the second direction Y, the distance between the end of the first electrical connection portion 33 closest to the first side portion 31 and the first side portion 31 is S1, as described above, and the distance between the end of the first electrical connection portion 33 closest to the second side portion 32 and the second side portion 32 is S2, as described above. Optionally, S1 < S2, which facilitates electrical connection between the first wiring harness 91 and the first electrical connection portion 33.

[0117] The second wiring harness 92 is electrically connected to the second electrical connection portion 34, and the distance between the second electrical connection portion 34 and the first side portion 31 is S3, and the distance between the second electrical connection portion 34 and the second side portion 32 is S4. Along the second direction Y, the spacing between the end of the second electrical connection portion 34 closest to the first side portion 31 and the first side portion 31 is the aforementioned S3, and the spacing between the end of the second electrical connection portion 34 closest to the second side portion 32 and the second side portion 32 is the aforementioned S4. Optionally, S4<S3. This is conducive to the electrical connection between the second wiring harness 92 and the second electrical connection portion 34. In one embodiment, S1<S2, the relationship between S3 and S4 is not limited and depends on actual needs. The first wiring harness 91 extends toward the first end edge 11 and is connected to a portion of the second circuit board 30 closer to the first side edge 31. This ensures that the first wiring harness 91 is positioned appropriately, saves material for the first wiring harness 91, and facilitates its extension toward the first end edge 11 of the cell pack 10. In another embodiment, S4 < S3, and the relationship between S1 and S2 is not limited and depends on actual needs. The second wiring harness 92 extends toward the second end edge 12, so that the second wiring harness 92 is connected to a portion of the second circuit board 30 closer to the second side edge 32. This ensures that the second wiring harness 92 is positioned appropriately, saves material for the second wiring harness 92, and facilitates its extension toward the second end edge 12 of the cell pack 10. In another embodiment, S1 < S2, and S4 < S3. The first wiring harness 91 is connected to a portion of the second circuit board 30 closer to the first side edge 31, and the second wiring harness 92 is connected to a portion of the second circuit board 30 closer to the second side edge 32. The arrangement position of the first wiring harness 91 can be matched, the material of the first wiring harness 91 can be saved, and the first wiring harness 91 can be extended toward the first end 11 of the battery cell group 10. The arrangement position of the second wiring harness 92 can also be matched, the material of the second wiring harness 92 can be saved, and the second wiring harness 92 can be extended toward the second end 12 of the battery cell group 10.

[0118] In one embodiment, referring to FIG7 , along the second direction Y, the first electrical connection portion 33 and the second electrical connection portion 34 have overlapping portions, and the third electrical connection portion 35 and the fourth electrical connection portion 36 have overlapping portions. Along the first direction X, the first electrical connection portion 33 and the third electrical connection portion 35 have overlapping portions, and the second electrical connection portion 34 and the fourth electrical connection portion 36 have overlapping portions.

[0119] Referring to Figures 17-21, the battery module 1 may include only one electronic device, namely, only the aforementioned first electronic device 41. The battery module 1 may also include multiple electronic devices. In one embodiment, the battery module 1 further includes a second electronic device 42 and a third wiring harness 93. The second electronic device 42 is separated from the first electronic device 41. The first end of the third wiring harness 93 is electrically connected to the second electronic device 42, and the second end of the third wiring harness 93 is electrically connected to the second circuit board 30. The second electronic device 42 is disposed on the side of the first end 11 of the cell group 10. In this embodiment, the battery module 1 includes the first electronic device 41 and the second electronic device 42. Both the first electronic device 41 and the second electronic device 42 are electrically connected to the second circuit board 30. Both the first electronic device 41 and the second electronic device 42 are disposed on the side of the first end 11 of the cell group 10. Both the first electronic device 41 and the second electronic device 42 are distributed along the second direction Y with respect to the cell group 10. This fully utilizes the space on the side of the first end 11 of the cell group 10 in the battery module 1, improving the space utilization of the battery module 1 and increasing the energy density of the battery module 1.

[0120] In some embodiments, the installation position of the third wiring harness 93 on the second circuit board 30 can be set according to actual needs. The third wiring harness 93 and the first wiring harness 91 can be installed on the same side of the second circuit board 30 or on different sides. In some embodiments, the first wiring harness 91 and the third wiring harness 93 are both installed on the same side of the second circuit board 30. When viewed along the third direction Z, the first wiring harness 91 and the third wiring harness 93 overlap in the first direction X, wherein the third wiring harness 93 partially overlaps with the first connecting device 912 of the first wiring harness 91 in the first direction X. In this way, the first wiring harness 91 and the third wiring harness 93 both extend directly toward the same side of the battery cell group 10, facilitating direct connection between the first wiring harness 91 and the first electronic device 41, and between the third wiring harness 93 and the second electronic device 42. In some embodiments, both the first wiring harness 91 and the third wiring harness 93 are connected to the same side of the second circuit board 30 near the first end edge 11, which helps reduce the length of the first wiring harness 91 and the third wiring harness 93.

[0121] When the battery module 1 includes multiple electronic devices, the types of the electronic devices can be the same or different. For example, when the battery module 1 includes a first electronic device 41 and a second electronic device 42, and the first electronic device 41 and the second electronic device 42 are of the same type, the first electronic device 41 and the second electronic device 42 can both be charging and discharging interfaces or wireless communication devices. When the battery module 1 includes a first electronic device 41 and a second electronic device 42, and the first electronic device 41 and the second electronic device 42 are of different types, the first electronic device 41 can be a signal transmission module, and the second electronic device 42 includes a connector 80, and the connector 80 is configured for charging and discharging the battery cell group 10, that is, the second electronic device 42 can be a charging interface or plug. In a specific embodiment, the first electronic device 41 is a wireless transmission module, and the second electronic device 42 is a charging and discharging socket.

[0122] In one embodiment, the first electronic device 41 at least partially overlaps with the second circuit board 30 when viewed along the second direction Y. This solution facilitates connecting the two ends of the first wiring harness 91 to the second circuit board 30 and the first electronic device 41 respectively.

[0123] In some embodiments, when viewed along the second direction Y, the first electronic device 41 is separated from the second circuit board 30 , which is beneficial for providing more arrangement space for the first electronic device 41 and facilitating the position arrangement of the first electronic device 41 .

[0124] Referring to Figures 5-7, when the battery module 1 includes a second electronic device 42, the second circuit board 30 further includes a third electrical connection portion 35, which can be a solder pad or solder hole on the second circuit board 30. The third wiring harness 93 is soldered to the third electrical connection portion 35. The closest distance between the third electrical connection portion 35 and the first side portion 31 is S5, and the closest distance between the third electrical connection portion 35 and the second side portion 32 is S6, where S5 is less than S6. The distance between the third electrical connection portion 35 and the first side portion 31 is closer than the distance between the third electrical connection portion 35 and the second side portion 32. In this solution, the arrangement of the third electrical connection portion 35 can further match the extension direction of the third wiring harness 93, reducing material waste of the third wiring harness 93.

[0125] When the battery module 1 includes a first electronic device 41 and a second electronic device 42, and both are located on the first end 11 of the cell pack 10, in one embodiment, the second electronic device 42 is located on the side of the first electronic device 41 facing away from the first circuit board 20 along the first direction X. That is, the first electronic device 41 is closer to the third end 13 of the cell pack 10 than the second electronic device 42. This facilitates the arrangement of the first and third wiring harnesses 91, 93, and reduces the risk of entanglement between the first and third wiring harnesses 91, 93.

[0126] In one embodiment, the second circuit board 30 further includes a fourth electrical connection portion 36, which is a structure such as a solder pad or a solder hole on the second circuit board 30. The battery module 1 further includes a fourth wiring harness 94, one end of which is welded to the fourth electrical connection portion 36 and the other end extends to the second end edge 12. The fourth electrical connection portion 36 is electrically connected to the third electrical connection portion 35. In this solution, a fourth wiring harness 94 extending toward the second end edge 12 is also provided, and the fourth wiring harness 94 is electrically connected to the second circuit board 30, so that circuits are led out on both the side of the second circuit board 30 close to the first end edge 11 and the side of the second circuit board 30 close to the second end edge 12, thereby improving the space utilization on the second circuit board 30.

[0127] In some embodiments, the battery module 1 further includes a third electronic device 43, which is electrically connected to the end of the fourth wiring harness 94 facing away from the second circuit board 30. In this embodiment, both the first electronic device 41 located at the first end edge 11 and the third electronic device 43 located at the third end edge 13 are electrically connected to the second circuit board 30. Compared to the prior art without a second circuit board 30, the wiring harness arrangement is more regular.

[0128] In some embodiments, as shown in FIG5 , when viewed from the third direction Z, the second circuit board 30 is located between the third electronic device 43 and the first electronic device 41. The first electronic device 41 and the second electronic device 42 are both located at the first end edge 11 of the battery cell group 10. The third electronic device 43 is located at the second end edge 12 of the battery cell group 10. The first electronic device 41 and the second electronic device 42 are both arranged opposite the third electronic device 43 in the second direction Y. In this embodiment, when viewed from the third direction Z, along the second direction Y, the distance from the third electronic device 43 to the second edge 3012 of the second circuit board 30 is less than the distance from the first electronic device 41 (or the second electronic device 42) to the first edge 3011 of the second circuit board 30.

[0129] In some embodiments, the installation position of the fourth wiring harness 94 on the second circuit board 30 can be set according to actual needs. The fourth wiring harness 94 and the third wiring harness 93 can be installed on the same side of the second circuit board 30 or on different sides. In some embodiments, the fourth wiring harness 94 and the third wiring harness 93 are installed on different sides of the second circuit board 30. Specifically, the fourth wiring harness 94 and the third wiring harness 93 are located on opposite sides of the second circuit board 30, and the fourth wiring harness 94 and the third wiring harness 93 are arranged opposite each other in the second direction Y. The fourth wiring harness 94 and the third wiring harness 93 have overlapping portions in the second direction Y. This helps to fully utilize the installation position of the second circuit board 30, reduces the size of the second circuit board 30 in the first direction X, and facilitates subsequent installation.

[0130] In some embodiments, as shown in FIG6 , a first wiring harness 91 and a second wiring harness 92 are disposed on opposite sides of the second circuit board 30 in the second direction Y. A third wiring harness 93 and a fourth wiring harness 94 are disposed on opposite sides of the second circuit board 30 in the second direction Y. The first wiring harness 91 and the third wiring harness 93 are both located on the same side of the second circuit board 30, and the second wiring harness 92 and the fourth wiring harness 94 are both located on the same side of the second circuit board 30. The first wiring harness 91 and the third wiring harness 93 overlap in the first direction X, and the first wiring harness 91 and the second wiring harness 92 overlap in the second direction Y. The fourth wiring harness 94 overlaps in the second direction Y, and the fourth wiring harness 94 overlaps in the first direction X. As a result, the installation locations of the first wiring harness 91, the second wiring harness 92, the third wiring harness 93, and the fourth wiring harness 94 on the second circuit board 30 are appropriately and compactly distributed, facilitating full utilization of the installation locations on the surface of the second circuit board 30.

[0131] Referring to FIG. 7 , when the second circuit board 30 includes a fourth wiring harness 94 and the fourth wiring harness 94 extends toward the second end edge 12 of the battery cell group 10, the fourth electrical connection portion 36 welded to the fourth wiring harness 94 can be closer to the second side edge 32 of the second circuit board 30. The closest distance between the fourth electrical connection portion 36 and the first side edge 31 is S7, and the closest distance between the fourth electrical connection portion 36 and the second side edge 32 is S8, where S7 is greater than S8. The distance between the fourth electrical connection portion 36 and the second side edge 32 is closer than the distance between the fourth electrical connection portion 36 and the first side edge 31. This ensures that the fourth wiring harness 94 extends in the same direction as the first wiring harness 94, reducing material waste for the fourth wiring harness 94.

[0132] In one embodiment, referring to FIG. 17 , the second circuit board 30 and the battery cell group 10 are arranged along a third direction Z. Along the first direction X, the size of the second circuit board 30 is H1, and the size of the battery cell group 10 is H2, where H1 < H2. That is, along the first direction X, the size of the second circuit board 30 is smaller than the size of the battery cell group 10. This reduces the space occupied by the second circuit board 30 and facilitates the placement of the second circuit board 30.

[0133] In some embodiments, the second circuit board 30 and the battery cell group 10 are arranged along the third direction Z. When viewed along the third direction Z, the second circuit board 30 is located inside the battery cell group 10 , thereby improving space utilization within the battery module 1 .

[0134] 1-5 , the battery module 1 further includes a first shell 50 and a second shell 60. The first shell 50 is mounted on the outside of the battery cell group 10. On the one hand, it can be used to protect the battery cell group 10, and on the other hand, it is used to fix electrical components related to the battery cell group 10. In one embodiment, the second shell 60 serves as the outer shell of the battery module 1, and the second shell 60 is mounted on the outside of the first shell 50 to protect the internal components of the battery module 1. In other embodiments, the battery module 1 may further include other shells mounted on the outside of the second shell 60, which are not described here. In one embodiment, the first circuit board 20 is disposed in the first shell 50. In this solution, the first circuit board 20 is disposed in the first shell 50, which can further protect the first circuit board 20 and reduce the risk of damage to the first circuit board 20 during maintenance of the battery module 1.

[0135] In one embodiment, the first housing 50 includes two interconnected first sub-housings 501 and second sub-housings 502. The first sub-housings 501 and second sub-housings 502 can be arranged along a third direction Z. When connected, the first sub-housings 501 and second sub-housings 502 can at least enclose components such as the battery cell assembly 10 and the first circuit board 20. The first sub-housings 501 and second sub-housings 502 can be connected by means of snap fasteners, adhesive bonding, screw fastening, or the like.

[0136] In one embodiment, the second housing 60 may include two interconnected third sub-housings 601 and a fourth sub-housing 602. The third sub-housing 601 and the fourth sub-housing 602 may be distributed along a third direction Z. After being connected, the third sub-housing 601 and the fourth sub-housing 602 enclose the internal components of the battery module 1. The third sub-housing 601 and the fourth sub-housing 602 may be connected by means of snap fasteners, adhesive bonding, screw fastening, etc.

[0137] In the embodiment shown in Figures 1-3, the arrangement direction of the first sub-housing 501 and the second sub-housing 502 is the same as the arrangement direction of the third sub-housing 601 and the fourth sub-housing 602. In other embodiments, the arrangement direction of the first sub-housing 501 and the second sub-housing 502 may be different from the arrangement direction of the third sub-housing 601 and the fourth sub-housing 602. For example, the first sub-housing 501 and the second sub-housing 502 are arranged along the third direction Z, and the third sub-housing 601 and the fourth sub-housing 602 are arranged along the first direction X. When the arrangement direction of the first sub-shell 501 and the second sub-shell 502 is the same as the arrangement direction of the third sub-shell 601 and the fourth sub-shell 602, the assembly of the first shell 50 and the second shell 60 is facilitated; when the arrangement direction of the first sub-shell 501 and the second sub-shell 502 is different from the arrangement direction of the third sub-shell 601 and the fourth sub-shell 602, the battery module 1 has better anti-drop performance, reducing the possibility of the first shell 50 and the second shell 60 splitting at the same time when the battery module 1 falls.

[0138] In one embodiment, the second circuit board 30 can be disposed between the first housing 50 and the second housing 60. Thus, when the second circuit board 30 needs to be inspected and repaired, only the second housing 60 needs to be disassembled. This ensures that during the inspection and repair of the battery module 1, the first circuit board 20 remains within the first housing 50 and protected by the first housing 50, reducing the risk of damage to the first circuit board 20. Furthermore, compared to a structure in which the second circuit board 30 is disposed within the first housing 50, a structure in which the second circuit board 30 is disposed between the first housing 50 and the second housing 60 allows inspection and repair of the second circuit board 30 by disassembling only one housing, thereby improving inspection and repair efficiency.

[0139] When the second circuit board 30 is disposed between the first housing 50 and the second housing 60, the second housing 60 can be fixed to either the first housing 50 or the second housing 60. In one embodiment, the second circuit board 30 is connected to the first housing 50. Compared to connecting the second circuit board 30 to the second housing 60, this solution effectively reduces the chance of damaging the cable connected to the second circuit board 30 when disassembling the first housing 50, thereby reducing the difficulty of disassembling the second housing 60.

[0140] In one embodiment, a positioning post is provided on the wall of the first housing 50 facing the second housing 60, and a positioning hole is provided on the second circuit board 30. The positioning post on the second circuit board 30 is axially engaged with the positioning hole to position the second circuit board 30 in the first housing 50. Threaded fasteners (e.g., screws) are then used to connect the second circuit board 30 and the first housing 50, thereby securing the second circuit board 30 to the second housing 60.

[0141] In one embodiment, referring to Figures 4 and 25-28 , a first recess 51 is provided on the wall of the first housing 50 facing the second housing 60, and the second circuit board 30 is disposed in the first recess 51. In this embodiment, the structure of the first recess 51 can reduce the gap between the first housing 50 and the second housing 60 where the second circuit board 30 is disposed, thereby reducing the risk of damage to the second circuit board 30 caused by excessive pressure from both the first housing 50 and the second housing 60.

[0142] Referring to Figures 25-27, in one embodiment, a groove can be provided on the wall of the first housing 50 facing the second housing 60 to form a first recess 51. In one embodiment, a raised portion 52 is provided on the wall of the first housing 50 facing the second housing 60, and the raised portion 52 encloses the first recess 51. Using the raised portion 52 to enclose the first recess 51 can reduce the wall thickness of the first housing 50 and reduce the space occupied by the first housing 50.

[0143] Along the third direction Z, the depth of the first recess 51 may be greater than the thickness of the second circuit board 30, or may be equal to or less than the thickness of the second circuit board 30. To ensure that the first recess 51 provides a better protective effect, in one embodiment, the depth of the first recess 51 along the third direction is greater than the thickness of the second circuit board 30.

[0144] A first connecting portion 70 is further disposed between the first housing 50 and the second housing 60. The first connecting portion 70 is connected to the first housing 50 and, together with the first recess 51, defines a chamber 76 in which the second circuit board 30 is disposed. In this embodiment, the relatively enclosed chamber 76 defined by the first connecting portion 70 and the first recess 51 further enhances the protection of the second circuit board 30 and reduces the pressure exerted on the second circuit board 30 by the first and second housings 50 and 60.

[0145] The first connecting portion 70 can be fixedly connected to the first housing 50 or removably welded. Fixed connections include welding, fusion bonding, or gluing, while removable connections include snap-fitting, plug-fitting, magnetic connection, or interference fit. In one embodiment, the first connecting portion 70 is removably connected to the first housing 50, specifically by snap-fitting. The specific snap-fitting structure of the first connecting portion 70 and the first housing 50 is not described here.

[0146] In one embodiment, the first connecting portion 70 includes a transparent area that at least partially overlaps with the second circuit board 30 when viewed along the third direction Z. In other words, at least a portion of the transparent area of ​​the first connecting portion 70 directly faces the second circuit board 30. When viewed along the third direction Z, maintenance personnel can observe only a portion of the second circuit board 30, or they can observe the entire second circuit board 30. In one embodiment, the operating status of at least some components on the first circuit board 20 can be observed without removing the first connecting portion 70, thereby improving maintenance convenience.

[0147] Furthermore, in order to be able to observe the working status of the components in all parts of the second circuit board 30, in one embodiment, the material of the first connecting portion 70 is transparent. The first connecting portion 70 is entirely transparent, and the working status of the second circuit board 30 in the accommodating cavity 76 can be clearly observed from outside the first connecting portion 70.

[0148] In one embodiment, the battery module 1 further includes an insulating portion (not shown in the figure), which wraps the second circuit board 30. In this solution, the second circuit board 30 is further protected by wrapping the insulating portion.

[0149] In some embodiments, the insulating portion is made of a transparent material. In this solution, the operator can observe the status of the components on the second circuit board 30 without removing the second circuit board 30, which facilitates the maintenance of the second circuit board 30. The insulating portion wraps the second circuit board 30, so when the insulating portion is in an opaque state, the maintenance personnel can only indirectly obtain the working status of the second circuit board 30 by observing the status of the insulating portion from outside the first connecting portion 70. For example, when the circuit on the second circuit board 30 breaks down and short-circuits, the heat generated is conducted to the insulating portion, causing the insulating portion to degenerate after experiencing high temperature (for example, it turns black after being subjected to high temperature). The maintenance personnel can indirectly obtain the working status of the second circuit board 30 by observing the status of the insulating portion.

[0150] In one embodiment, the insulating portion can also be in a transparent state. In this case, the maintenance personnel can fully observe the working status of the second circuit board 30 from outside the first connecting portion 70. The applicant also considers that when a fault is found in the second circuit board 30, in order to repair the second circuit board 30, it is necessary to remove the insulating portion wrapping the second circuit board 30, and the electronic components on the second circuit board 30 will not be damaged during the removal process. In order to achieve the above purpose, the material of the insulating portion can further be silicone gel. In this solution, the material of the insulating portion can make it possible to remove the insulating portion wrapping the second circuit board 30 when the second circuit board 30 needs to be repaired, so as to facilitate the repair of the second circuit board 30.

[0151] The insulating part can be introduced into the first recess 51 before the first connecting part 70 is connected to the first shell 50, or can be introduced into the first recess 51 after the first connecting part 70 is connected to the first shell 50. When the insulating part is introduced after the first connecting part 70 is connected to the first shell 50, referring to Figures 28-33, in one embodiment, the first connecting part 70 is provided with a first opening 71, and the first opening 71 is connected to the accommodating chamber 76. In this solution, after the first connecting part 70 is connected to the first shell 50 and the first connecting part 70 and the first recess 51 jointly define the accommodating chamber 76, the insulating part can be injected into the accommodating chamber 76 using the first opening 71. The shape and size of the first opening 71 can be freely set depending on the injection amount of the insulating part and the size and shape of the injection equipment for injecting the insulating part, which will not be elaborated here.

[0152] When the first connection portion 70 is provided with a first opening 71, after the insulating portion is injected into the accommodating cavity 76 through the first opening 71, the insulating portion overflowing from the first opening 71 can be used to seal the first opening 71, and a baffle can also be added. In one embodiment, the wall surface of the first connection portion 70 facing the second shell 60 is provided with a second recess 72, and the second recess 72 is provided with the aforementioned first opening 71 on the bottom wall facing the second shell 60. The wall surface of the first connection portion 70 facing away from the accommodating cavity 76 is provided with a sink, and the aforementioned first opening 71 is opened on the bottom wall of the sink. On the one hand, if the insulating portion overflowing from the first opening 71 is used to seal the first opening 71, the insulating portion overflowing from the first opening 71 will fill the second recess 72, thereby improving the sealing performance. On the other hand, if the first opening 71 is sealed by covering the first opening 71 with a baffle, the baffle is positioned in the second recess 72, and the baffle is not easily separated from the second opening 75, resulting in a better sealing effect.

[0153] To enhance the structural strength of the first connecting portion 70, in one embodiment, the first connecting portion 70 includes an inner wall surface facing the accommodating cavity 76, which is provided with ribs 73 that enclose a plurality of grid slots 74. The provision of the ribs 73 enhances the structural strength of the first connecting portion 70. The ribs 73 are provided with second openings 75 that connect to each grid slot 74. Thus, as the insulating portion is introduced through the first opening 71 into the accommodating cavity 76 defined by the first recess 51 and the first connecting portion 70, as the insulating portion fills each grid slot 74, the air within each grid slot 74 can flow through the second openings 75, thereby fully filling each grid slot 74. In some embodiments, the second openings 75 extend perpendicularly to the inner wall surface of the first connecting portion 70 facing the accommodating cavity 76 to the inner wall surface of the first connecting portion 70 facing the accommodating cavity 76. This solution further enhances the gas conductivity of each grid slot 74 and increases the amount of insulating portion injected into the accommodating cavity 76.

[0154] In one embodiment, the second circuit board 30 and the cell pack 10 are arranged along the third direction Z. The first housing 50 has a first wall 53 and an eighth wall 53a arranged opposite each other along the third direction Z. The second circuit board 30 is connected to the first wall 53 of the first housing 50. Along the second direction Y, the first housing 50 has a second wall 54 and a third wall 55 arranged opposite each other. The second wall 54 and the third wall 55 are located on either side of the first wall 53, respectively. The second wall 54 is located on the side of the cell pack 10 where the first electronic device 41 is located. The first wall 53 is provided with the aforementioned first recess 51, which extends to the intersection of the third wall 55 and the first wall 53. When viewed along the third direction Z, the first recess 51 extends to the third wall 55. The second recess 72 extending to the intersection of the first wall 53 and the third wall 55 maximizes the length of the second wiring harness 92 within the first recess 51, effectively enhancing the protection of the second wiring harness 92.

[0155] In one embodiment, the first recess 51 can be arranged on the first wall 53. In another embodiment, the first recess 51 can be arranged on multiple walls of the first shell 50. In one embodiment, the first recess 51 includes a first portion 511 located on the first wall 53 and a second portion 512 located on the third wall 55. The first portion 511 is connected to the second portion 512, and the second wiring harness 92 extends from the first portion 511 to the second portion 512 in the first recess 51. The first recess 51 is arranged on at least two walls of the first shell 50 (the two walls are the first wall 53 and the second wall 54). In this solution, the extension direction of the second wiring harness 92 can be matched, and the second wiring harness 92 can be accommodated in the accommodating cavity 76 to the maximum extent, further enhancing the protection effect of the second wiring harness 92. The risk of the second wiring harness 92 becoming loose and desoldering due to vibration of the battery module 1 during use is reduced.

[0156] When the first recess 51 is distributed on multiple wall surfaces of the first shell 50, the first recess 51 can be enclosed by a single component (i.e., the aforementioned first connecting portion 70) to form the accommodating cavity 76, or can be enclosed by multiple components to form the accommodating cavity 76. In one embodiment, the first connecting portion 70 can also have a third part and a fourth part, and the third part is connected to the fourth part. The third part of the first connecting portion 70 encloses the first part 511 of the first recess 51, and the fourth part of the first connecting portion 70 encloses the second part 512 of the first recess 51. That is, the first recess 51 is enclosed by the first connecting portion 70 to form the accommodating cavity 76. In another embodiment, the first recess 51 can be enclosed by the first connecting portion 70 and the second connecting portion to form the accommodating cavity 76. In one embodiment, the first recess 51 encloses the first part 511 of the first recess 51, and the first shell 50 is further connected to the second connecting portion, and the second connecting portion is used to enclose the second part 512 of the first recess 51 (the second connecting portion can completely enclose the second part 512 of the first recess 51, or enclose part of the first recess 51). That is, the first recess 51 is enclosed by the first connecting portion 70 and the second connecting portion to form the accommodating cavity 76. In one embodiment, the second portion 512 is integrally connected to the first housing 50. In other embodiments, the second connecting portion can also be detachably connected to the first housing 50.

[0157] Referring to Figures 22-25, in one embodiment, along a first direction X, the first housing 50 has a fourth wall 56 and a fifth wall 57 disposed opposite each other, with the first circuit board 20 disposed between the fourth wall 56 and the cell pack 10. The fourth wall 56 is disposed on the side of the third end edge 13 of the cell pack 10, and the fifth wall 57 is disposed on the side of the fourth end edge 14 of the cell pack 10. Along the first direction X, the closest distance between the second portion 512 of the first recess 51 and the fourth wall 56 is L5, and the closest distance between the second portion 512 of the first recess 51 and the fifth wall 57 is L6, where L5 < L6. That is, the second portion 512 of the first recess 51 is closer to the fourth wall 56 than to the fifth wall 57. Thus, after the second wiring harness 92 extends out of the first recess 51, it can be closer to the fourth wall 56. The first circuit board 20 is disposed between the fourth wall 56 and the battery cell assembly 10 . After the second wiring harness 92 extends out of the second recess 72 , it can be closer to the first circuit board 20 , making it easier to electrically connect to the first circuit board 20 .

[0158] When the battery module 1 has multiple electronic devices for external connection, all of the electronic devices may be electrically connected to the second circuit board 30 and thereby indirectly electrically connected to the first circuit board 20. Alternatively, some of the electronic devices may be electrically connected to the second circuit board 30, while other electronic devices may be electrically connected to the second circuit board 30 and thereby indirectly electrically connected to the first circuit board 20. In one embodiment, the battery module 1 has multiple electronic devices for external connection, and each of the electronic devices is electrically connected to the second circuit board 30 and thereby indirectly electrically connected to the first circuit board 20.

[0159] In some embodiments, the second circuit board 30 may also include electronic components for battery charge and discharge management. In this way, the second circuit board 30 can share some of the functions of the first circuit board 20. For example, the second circuit board 30 may also be provided with electronic components for overcharge protection, over-discharge protection, charging overcurrent protection, discharging overcurrent protection, short-circuit protection, temperature protection, or voltage equalization. The specific functions of the electronic components provided on the second circuit board 30 depend on the specific circumstances. All electronic components for a certain function mentioned above may be provided on the second circuit board 30, or some electronic components for a certain function mentioned above may be provided, and the remaining electronic components for implementing the function may be arranged on the first circuit board 20. In this solution, the number of electronic components on the first circuit board 20 can be reduced, the processing cost and difficulty of the first circuit board 20 can be reduced, and the volume of the first circuit board 20 and the space occupied by the first circuit board 20 can be reduced.

[0160] Referring to Figures 36-40, a connector 80 is provided to facilitate the extraction of the wiring harness within the accommodating cavity 76 defined by the first recess 51 and the first connecting portion 70, and to facilitate the assembly of the wiring harnesses. Specifically, the accommodating cavity 76 is connected to the outside world (outside the accommodating cavity 76) through the third opening 58. The third opening 58 can be provided on the first connecting portion 70; the third opening 58 can be provided on the first shell 50; the third opening 58 can also be provided in part on the first connecting portion 70 and in part on the first shell 50 (i.e., the first shell 50 and the first connecting portion 70 jointly define the third opening 58). For ease of description, the following embodiments are described as an example in which the first shell 50 is provided with the third opening 58.

[0161] The connector 80 can be used to secure the first wire harness 91, or it can be used to secure the second wire harness 92 or other wire harnesses. Specifically, in one embodiment, the connector 80 is primarily used to secure the second wire harness 92. For ease of description, the following embodiments illustrate the connector 80 being used to secure the second wire harness 92.

[0162] The connector 80 is detachably connected to the first housing 50 , specifically by a snap-fit ​​connection, a magnetic connection, an interference fit connection, etc. The connector 80 covers the third opening 58 and has a wire hole 813 , which communicates with the accommodating chamber 76 . The second wire harness 92 is passed through the wire hole 813 , thereby allowing the second wire harness 92 to be drawn out of the accommodating chamber 76 and electrically connected to the first circuit board 20 .

[0163] When the second wiring harness 92 includes one wire, the connector 80 may include only one wire passing hole 813. When the second wiring harness 92 includes multiple wires, the connector 80 may include only one wire passing hole 813 or multiple wire passing holes 813. When the connector 80 includes one wire passing hole 813, all the wires of the second wiring harness 92 are passed through the wire passing hole 813. When the connector 80 includes multiple wire passing holes 813, the number of wire passing holes 813 may be the same as or different from the number of wires of the second wiring harness 92. When the number of wire passing holes 813 is the same as the number of wires of the second wiring harness 92, each wire of the second wiring harness 92 is passed through each wire passing hole 813 in a one-to-one correspondence. When the number of wire passing holes 813 is less than the number of wires of the second wiring harness 92, each wire passing hole 813 is passed through at least one of the above-mentioned wires, and some of the wire passing holes 813 are passed through multiple of the above-mentioned wires.

[0164] In one embodiment, by adding a connector 80, during the assembly process of the second wiring harness 92, after the second wiring harness 92 is passed through the connector 80, after the second wiring harness 92 is electrically connected to the first circuit board 20 and the second circuit board 30, the connector 80 is pushed relative to the second wiring harness 92 to be connected to the first shell 50, thereby achieving the purpose of the second wiring harness 92 passing out of the accommodating cavity 76.

[0165] During the assembly process, after the second wiring harness 92 is electrically connected to the first circuit board 20 and the second circuit board 30, the connector 80 is moved once relative to the second wiring harness 92 to complete the assembly of the second wiring harness 92. Compared to previous solutions, the operator does not need to repeatedly pull the second wiring harness 92 to adjust the position of the second wiring harness 92 relative to the first circuit board 20 and the second circuit board 30, making the assembly process of the second wiring harness 92 more convenient and efficient. Because the connector 80 is detachably connected to the first housing 50 in one embodiment, disassembly of the wiring harness is also very convenient, improving maintenance efficiency.

[0166] In one embodiment, the connector 80 is engaged with the first housing 50. Specifically, the connector 80 may include a connecting block 81 and a first engaging member 82. The connecting block 81 includes a sixth wall 811, a wire hole 813 is provided on the sixth wall 811, and the first engaging member 82 is connected to the sixth wall 811. The first housing 50 includes a second engaging member 59 provided at the third opening 58, and the first engaging member 82 is engaged with the second engaging member 59.

[0167] In one embodiment, the first clamping member 82 includes two oppositely disposed hooks 821, and the second clamping member 59 includes an annular flange provided at the third opening 58 and extending inwardly toward the third opening 58. The two hooks 821 are clamped on the inner annular wall of the annular flange, and the connecting block 81 abuts against the outer annular wall of the annular flange. The above-mentioned "connecting block 81 abuts against the outer annular wall of the annular flange" means that the connecting block 81 can directly contact the outer annular wall and thus abut against the outer annular wall, or the connecting block 81 can indirectly abut against the outer annular wall through an intermediate component. Whether the connecting block 81 directly contacts the outer annular wall depends on actual needs.

[0168] During the process of assembling the connecting member 80 onto the first shell 50, the two hooks 821 pass through the third opening 58 on the first shell 50. After passing through the third opening 58, the two hooks 821 abut against the inner annular surface of the annular flange, limiting the movement of the connecting member 80 in the direction away from the accommodating cavity 76, and the connecting block 81 abuts against the outer annular wall surface of the annular flange (the annular wall surface away from the accommodating cavity 76), limiting the movement of the connecting member 80 into the accommodating cavity 76. That is, the above-mentioned structural arrangement makes the connecting member 80 more firmly fixed to the first shell 50.

[0169] Referring to Figures 38-41 , in one embodiment, the connector 80 may further include a buffer member 83. One surface of the buffer member 83 abuts the sixth wall 811, and the other surface abuts the outer annular wall of the annular flange (when the connector 80 is mounted on the first housing 50). The buffer member 83 is configured to generate pressure on the sixth wall 811 and the outer annular wall by deforming perpendicularly to the sixth wall 811. The buffer member 83 is elastic and can deform perpendicularly to the sixth wall 811. When the hook 821 extends into the third opening 58 and abuts the inner annular wall of the annular flange, the buffer member 83 is squeezed by the annular flange, causing it to be compressed. The buffer member 83 simultaneously applies pressure to the annular flange toward the accommodating cavity 76 and to the connecting block 81 away from the accommodating cavity 76, causing the connecting block 81 to indirectly abut against the outer annular wall. The buffer member 83 can also offset manufacturing errors of the first connector 80 through the magnitude of its elastic deformation. When the actual distance between the hook 821 and the connecting block 81 is slightly greater than the designed distance, the aforementioned processing error of the hook 821 can be offset by reducing the deformation of the buffer 83. When the actual distance between the hook 821 and the connecting block 81 is slightly greater than the designed distance, the aforementioned processing error of the hook 821 can be offset by increasing the deformation of the buffer 83.

[0170] At the same time, the buffer member 83 can also improve the sealing effect between the connecting block 81 and the first shell 50, alleviating the problem that the accommodating cavity 76 is connected to the space outside the accommodating cavity 76 through the gap between the outer annular wall surface and the connecting block 81.

[0171] In one embodiment, the buffer member 83 is annular and is disposed around the outer side of the first clamping member 82. In this way, the structure of the buffer member 83 can match the annular structure of the annular flange, saving material for the buffer member 83 and reducing material costs.

[0172] The connector 80 can be fixedly or flexibly connected to the second wiring harness 92. When flexibly connected, the connector 80 and the second wiring harness 92 can be connected by an interference fit, allowing the wire holes 813 to form an interference fit with the wires passing through them. When fixedly connected, the connector 80 and the second wiring harness 92 can be adhesively bonded to the wires, using adhesive to secure the relative positions of the two.

[0173] When the connector 80 and the second wiring harness 92 are bonded together using adhesive, in one embodiment, the connector 80 includes a rib 814 disposed around the wire hole 813. The rib 814 defines a groove 815 that can accommodate adhesive. When the adhesive is poured into the groove 815, the adhesive can not only fix the relative position of the second wiring harness 92 and the connector 80, but also seal the wire hole 813, thereby improving the sealing performance of the accommodating cavity 76.

[0174] The wire-passing hole 813 is a through hole, which has two opposite openings, one of which is opposite to the accommodating cavity 76, and the other is away from the accommodating cavity 76. The rib 814 can be arranged on any side of the two openings. Referring to Figure 38, in one embodiment, the connecting block 81 includes a seventh wall 812 arranged opposite to the sixth wall 811, the wire-passing hole 813 is connected to the seventh wall 812, and the rib 814 is connected to the seventh wall 812. In one embodiment, the rib 814 is arranged at the opening position of the wire-passing hole 813 away from the accommodating cavity 76. In this way, the connector 80 can be injected with glue after being assembled with the first shell 50. There is no order restriction on the assembly process and the injection process of the connector 80, and the processing is more convenient.

[0175] A second aspect of the present application further provides an electrical device, which includes the battery module 1 in any of the above embodiments.

[0176] It should be noted that the preferred embodiments of the present application are provided in the specification and drawings of this application. However, the present application can be implemented in many different forms and is not limited to the embodiments described in this specification. These embodiments do not serve as additional limitations on the content of this application. The purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this application. In addition, the above-mentioned technical features can be combined with each other to form various embodiments not listed above, which are all considered to be within the scope of the description of this application. Furthermore, it is obvious to those skilled in the art that improvements or modifications can be made based on the above description, and all such improvements and modifications should fall within the scope of protection of the claims attached to this application.

Claims

1. A battery module, characterized in that: include: A battery cell group, the battery cell group comprising at least one battery cell; a first circuit board, the first circuit board being used for charge and discharge management of the battery module, the first circuit board and the battery cell group being arranged along a first direction; a second circuit board, the second circuit board being separated from the first circuit board; a first electronic device, wherein the first electronic device and the battery cell group are arranged along a second direction, and the second direction is perpendicular to the first direction; a first wiring harness, the first wiring harness being electrically connected to the first electronic device and the second circuit board; A second wiring harness is electrically connected to both the first circuit board and the second circuit board.

2. The battery module according to claim 1, wherein: The second circuit board and the battery cell group are arranged along the first direction, or along a third direction perpendicular to both the first direction and the second direction.

3. The battery module according to claim 2, characterized in that: Along the second direction, the battery cell group has a first end edge and a second end edge opposite to each other; Along the second direction, the first electronic device is arranged on one side of the first end of the battery cell group.

4. The battery module according to claim 3, characterized in that: Along the second direction, the second wiring harness extends from the second circuit board to the second end edge.

5. The battery module according to claim 3, wherein: Along the second direction, the distance between the second circuit board and the first end edge is L1, and the distance between the second circuit board and the second end edge is L2, where L1>L2.

6. The battery module according to claim 5, characterized in that: Along the first direction, the battery cell group has a third end side and a fourth end side that are opposite to each other, and the first circuit board is arranged on one side of the third end side of the battery cell group.

7. The battery module according to claim 6, characterized in that: The second circuit board and the battery cell group are arranged along the third direction; Along the first direction, the distance between the second circuit board and the third end edge is L3, and the distance between the second circuit board and the fourth end edge is L4, where L3<L4.

8. The battery module according to claim 7, characterized in that: Along the second direction, the second circuit board has a first side portion and a second side portion that are opposite to each other, and the second circuit board includes a first electrical connection portion and a second electrical connection portion; Along the second direction, the first wiring harness is connected to the first electrical connection portion, and the distance between the first electrical connection portion and the first side portion is S1, and the distance between the first electrical connection portion and the second side portion is S2; Along the second direction, the second wiring harness is connected to the second electrical connection portion, and the distance between the second electrical connection portion and the first side portion is S3, and the distance between the second electrical connection portion and the second side portion is S4; Wherein, S1<S2; and / or S4<S3.

9. The battery module according to claim 8, characterized in that: The battery module further includes a second electronic device and a third wiring harness, wherein the second electronic device is separated from the first electronic device, and one end of the third wiring harness is electrically connected to the second electronic device and the other end is electrically connected to the second circuit board; The second electronic device is arranged on one side of the first end of the battery cell group.

10. The battery module according to claim 9, characterized in that: Observed along the second direction, along the first direction, the first electronic device at least partially overlaps with the second circuit board.

11. The battery module according to claim 9, characterized in that: When viewed along the second direction, the second electronic device is spaced apart from the second circuit board along the first direction.

12. The battery module according to claim 9, characterized in that: The second circuit board further includes a third electrical connection portion, the third wiring harness is welded to the third electrical connection portion, the closest distance between the third electrical connection portion and the first side portion is S5, and the closest distance between the third electrical connection portion and the second side portion is S6, S5<S6.

13. The battery module according to claim 9, characterized in that: The first electronic device includes a signal transmission module, and the second electronic device includes a connector configured to be used for charging and discharging the battery cell group.

14. The battery module according to claim 13, characterized in that: Along the first direction, the second electronic device is arranged on a side of the first electronic device away from the first circuit board.

15. The battery module according to claim 12, characterized in that: The second circuit board further includes a fourth electrical connection portion, and the battery module further includes a fourth wiring harness, one end of the fourth wiring harness is welded to the fourth electrical connection portion, and the other end extends to the second end edge; The fourth electrical connection portion is electrically connected to the third electrical connection portion.

16. The battery module according to claim 15, characterized in that: The battery module further includes a third electronic device, which is electrically connected to an end of the fourth wiring harness facing away from the second circuit board.

17. The battery module according to claim 15, characterized in that: The shortest distance between the fourth electrical connection portion and the first side portion is S7, and the shortest distance between the fourth electrical connection portion and the second side portion is S8, where S7>S8.

18. The battery module according to claim 2, characterized in that: The second circuit board and the battery cell group are arranged along the third direction; Along the first direction, the size of the second circuit board is H1, the size of the battery cell group is H2, and H1<H2.

19. The battery module according to claim 2, characterized in that: The second circuit board and the battery cell group are arranged along the third direction; When viewed along the third direction, the second circuit board is located inside the battery cell group.

20. The battery module according to claim 2, characterized in that: The first wiring harness and the second circuit board are detachably connected or welded.

21. The battery module according to claim 20, characterized in that: The battery module further includes: A first shell is sleeved outside the battery cell group; A second shell is sleeved outside the first shell; Wherein, the first circuit board is arranged in the first shell.

22. The battery module according to claim 21, characterized in that: The second circuit board is arranged between the first shell and the second shell.

23. The battery module according to claim 22, characterized in that: The second circuit board is connected to the first housing.

24. The battery module according to claim 21, characterized in that: A first recess is provided on a wall surface of the first shell facing the second shell, and the second circuit board is arranged in the first recess.

25. The battery module according to claim 24, characterized in that: A first connecting portion is further provided between the first shell and the second shell. The first connecting portion is connected to the first shell. The first connecting portion and the first recess jointly define an accommodating cavity. The second circuit board is provided in the accommodating cavity.

26. The battery module according to claim 25, characterized in that: The first connecting portion includes a transparent area, and when viewed along the third direction, the transparent area at least partially overlaps with the second circuit board; or, The first connecting portion is made of transparent material.

27. The battery module according to claim 25, characterized in that: The battery module further includes an insulating portion, which wraps the second circuit board.

28. The battery module according to claim 27, characterized in that: The insulating part is made of transparent material.

29. The battery module according to claim 27, characterized in that: The insulating part is made of silicone gel.

30. The battery module according to claim 29, characterized in that: The first connecting portion is provided with a first opening, and the first opening is communicated with the accommodating cavity.

31. The battery module according to claim 30, characterized in that: A second recess is provided on a wall surface of the first connecting portion facing the second shell, and the first opening is provided on a bottom wall of the second shell facing the second recess.

32. The battery module according to claim 25, characterized in that: The first connecting portion includes an inner wall surface facing the accommodating cavity, the inner wall surface is provided with a rib plate, the rib plate encloses a plurality of grid slots, the rib plate is provided with a second opening, and the second opening is connected to each of the grid slots.

33. The battery module according to claim 32, characterized in that: The second opening extends to the inner wall surface along a direction perpendicular to the inner wall surface.

34. The battery module according to claim 24, characterized in that: A convex portion is provided on a wall surface of the first shell facing the second shell, and the convex portion encloses the first concave portion.

35. The battery module according to claim 24, characterized in that: The second circuit board and the battery cell group are arranged along the third direction, the first shell has a first wall surface, and the second circuit board is connected to the first wall surface of the first shell; Along the second direction, the first housing has a second wall and a third wall arranged opposite to each other, the second wall and the third wall are respectively located on both sides of the first wall, and the second wall is provided on a side of the battery pack where the first electronic device is provided; The first wall surface is provided with the first recessed portion, and the first recessed portion extends to the junction of the third wall surface and the first wall surface.

36. The battery module according to claim 35, characterized in that: The first recess includes a first portion located on the first wall surface and a second portion located on the third wall surface. The first portion communicates with the second portion. The second wiring harness extends from the first portion to the second portion in the first recess.

37. The battery module according to claim 36, characterized in that: Along the first direction, the first housing has a fourth wall and a fifth wall that are opposite to each other, and the first circuit board is arranged between the fourth wall and the battery cell group; The shortest distance between the second portion and the fourth wall surface is L5, and the shortest distance between the second portion and the fifth wall surface is L6, where L5<L6.

38. The battery module according to claim 1, characterized in that: The second circuit board includes electronic components, and the electronic components are used for charge and discharge management of the battery.

39. An electrical device, characterized in that: A battery module comprising any one of claims 1-38.

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