WO2024007219A1

WO2024007219A1 - Battery module and electrical device

Info

Publication number: WO2024007219A1
Application number: PCT/CN2022/104214
Authority: WO
Inventors: 夏君; 吴明杰; 农文彬
Original assignee: 东莞新能安科技有限公司
Priority date: 2022-07-06
Filing date: 2022-07-06
Publication date: 2024-01-11

Abstract

The present application relates to the technical field of batteries, and discloses a battery module and an electrical device. The battery module comprises a battery cell group, a first circuit board, a second circuit board, a first electronic device, a second electronic device, 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 charging and discharging management of the battery module, and the first circuit board and the battery cell group are arranged in a first direction. The second circuit board is separated from the first circuit board. The first electronic device and the battery cell group are arranged in a second direction, and the second direction is perpendicular to the first direction and a third direction. The first wire harness is electrically connected to both the first electronic device and the second circuit board. The second wire harness is electrically connected to both the first circuit board and the second circuit board. According to the present solution, the second circuit board is newly added; when the first electronic device breaks down and needs to be maintained and checked, the first electronic device and the second circuit board can be disassembled for maintenance, thus facilitating maintenance of the battery module.

Description

A battery module and electrical equipment

Technical field

Embodiments of the present application relate to the technical field of batteries, and in particular, to a battery module and electrical equipment.

Background technique

The battery module has a circuit board (BMS board) used for battery charge and discharge management. The BMS board is electrically connected to electronic equipment used for charge and discharge or electronic equipment connected to external communication. In the related art, the arrangement position of the connector is limited by the position arrangement of the BMS board. Once the position of the BMS board is determined, it is difficult to flexibly arrange the connectors.

Contents of the invention

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.

In order to solve the above technical problems, one technical solution adopted by this application is to provide a battery module. The battery module includes a battery pack, a first circuit board, a second circuit board, a first electronic device, a second electronic device, The first wire harness and the second wire harness. The battery pack includes at least one battery cell. The first circuit board is used for charge and discharge management of the battery module, and the first circuit board and the battery pack are arranged along the first direction. The second circuit board is separated from the first circuit board. The first electronic device and the battery core group are arranged along a second direction, and the second direction is perpendicular to both the first direction and the third direction. The first wire harness is electrically connected to both the first electronic device and the second circuit board. The second wire harness is electrically connected to both the first circuit board and the second circuit board. In this solution, a second circuit board is added. The first circuit board can be used to charge and discharge the battery module. The second circuit board is separated from the first circuit board, and a second wiring harness is used to electrically connect the two. . 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 the first electronic device needs to be repaired and inspected, the first electronic device and the second circuit board can be disassembled for maintenance, which reduces the risk of the first circuit board and the circuit board being disassembled There is a risk of damage to the electronic components on the battery module, which facilitates the maintenance of the battery module.

In some embodiments, the second circuit board and the battery core group are arranged along the first direction, or along a third direction that is perpendicular to both the first direction and the second direction. In this solution, the second circuit board, the first circuit board and the battery core group are arranged in mutually perpendicular directions, so that the layout positions of the second circuit board and the first circuit board are separated, reducing the need for the second circuit board to disassemble and repair the first circuit board. The circuit board is affected and the efficiency of maintenance is improved.

In some embodiments, along the second direction, the battery core group has a first end edge and a second end edge that are opposite to each other; along the second direction, the first electronic device is disposed on one side of the first end edge of the battery core group. In this solution, the first electronic device is disposed at the first end position so that the first electronic device is separated from the first circuit board and the second circuit board for easy maintenance.

In some embodiments, along the second direction, the second wire harness extends from the second circuit board to the second end edge. The structure in which the second wire harness extends to the second end edge allows the second wire harness and the first wire harness to extend in two away directions respectively, thereby reducing mutual interference between the wire harnesses therebetween. At the same time, since the first electronic device is disposed at the first end of the battery pack, the position at the first end and the second end of the battery pack can be freed up for arranging the battery module. For other components, at this time, the second wire harness extends toward the second end position, which can reasonably utilize the space at the second end position of the battery pack.

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, and L1>L2. In this solution, L1>L2, so that there is a large enough distance between the first electronic device and the second circuit board, so that the first wire harness can have a certain layout space, which alleviates the problem that the first wire harness is too short and is inconvenient for the first wire harness. Problems with the placement of electronic equipment.

In some embodiments, along the first direction, the battery core group has a third end side and a fourth end side distributed opposite to each other, and the first circuit board is disposed on one side of the third end side of the battery core group. In this solution, the arrangement positions of the first circuit board and the first electronic device are separated, which reduces the impact on the first circuit board when the first electronic device is disassembled.

In some embodiments, the second circuit board and the battery core 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 L3. For L4, L3＜L4. In this solution, that is, L3<L4, the second circuit board can be placed closer to the first circuit board, which can facilitate the second wire harness to electrically connect the first circuit board and the second circuit board.

In some embodiments, along the second direction, the second circuit board has first side portions and second side portions distributed 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 In the second direction, the first wire harness is connected to the first electrical connection part, the distance between the first electrical connection part and the first side part is S1, and the distance from the second side part is S2; along the second direction, the distance between the first electrical connection part and the first side part is S1. The two wire harnesses are connected to the second electrical connection part, the distance between the second electrical connection part and the first side part is S3, and the distance from the second side part is S4; wherein, S1<S2; and/or S4< S3. In this solution, since the first wire harness extends toward the first end edge, the first wire harness is connected to the second circuit board closer to the first side. This can match the layout position of the first wire harness and save the cost of the second circuit board. The material of the wire harness facilitates the first wire harness to extend toward the first end of the battery core group. And/or, since the second wire harness extends in the direction of the second end edge, the second wire harness is connected to a portion of the second circuit board closer to the second side, which can match the layout position of the second wire harness and save the second wire harness. The material of the wire harness facilitates the second wire harness to extend toward the second end edge of the battery core group.

In some embodiments, the battery module further includes a second electronic device and a third wire harness. The second electronic device is separated from the first electronic device. One end of the third wire harness is electrically connected to the second electronic device and the other end is electrically connected to the second circuit. Board electrical connections. The second electronic device is disposed on one side of the first end of the battery pack. In this solution, the battery module has at least two electronic devices (the two electronic devices are a first electronic device and a second electronic device respectively). The first electronic device and the second electronic device are both electrically connected to the second circuit board. The first electronic device and the second electronic device are both arranged on the same side of the battery pack (ie, the first end side of the battery pack), which can improve the space utilization of the battery module.

In some embodiments, the first electronic device is at least partially coincident with the second circuit board along the first direction when viewed along the second direction.

In some embodiments, when viewed along the second direction, the second electronic device is positioned away from the second circuit board along the first direction.

In some embodiments, the second circuit board further includes a third electrical connection part, the third wire harness is welded to the third electrical connection part, and the closest distance between the third electrical connection part and the first side part is S5, and between the third electrical connection part and the second side part is S5. The shortest distance between the sides is S6, S5<S6, that is, the distance between the third electrical connection part and the first side part is closer to the distance between the third electrical connection part and the second side part. In this solution, the arrangement position of the third electrical connection part can further match the extension direction of the third wire harness, thereby reducing the waste of material of the third wire harness.

In some embodiments, the first electronic device includes a signal transmission module, and the second electronic device includes a connector configured to charge and discharge the battery pack.

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

In some embodiments, the second circuit board further includes a fourth electrical connection part, and the battery module further includes a fourth wire harness, one end of the fourth wire harness is welded to the fourth electrical connection part, and the other end extends to the second end edge; The fourth electrical connection part is electrically connected to the third electrical connection part. In this solution, a fourth wire harness extending toward the second end is also provided to be electrically connected to the second circuit board, so that the opposite sides of the second circuit board (the side close to the first end and the side close to the second end) There are circuit leads on both sides), which improves the space utilization on the second circuit board.

In some embodiments, the battery module further includes a third electronic device, and the third electronic device is electrically connected to an end of the fourth wire harness facing away from the second circuit board. In this solution, the first electronic device located at the first end and the third electronic device located at the third end are both electrically connected to the second circuit board. Compared with the existing technology where the second circuit board is not provided, , the layout of the wiring harness is more regular.

In some embodiments, the closest distance between the fourth electrical connection part and the first side part is S7, and the shortest distance between the fourth electrical connection part and the second side part is S8, S7>S8, that is, the fourth electrical connection part and the second side part are The distance between the fourth electrical connection part and the first side part is closer than the distance between the fourth electrical connection part and the first side part, so that the extension direction of the fourth wire harness can be matched and the waste of material of the fourth wire harness can be reduced.

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

In some embodiments, the second circuit board and the battery core group are arranged along the third direction; when viewed along the third direction, the second circuit board is located within the battery core group. In this solution, the second circuit board does not occupy additional space in the first direction of the battery module, which improves space utilization in the battery module.

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

In some embodiments, the battery module further includes: a first shell and a second shell. The first shell is sleeved outside the battery pack; the second shell is sleeved outside the first shell; wherein, the first shell is sleeved outside the battery pack; The circuit board is located in the first housing. In this solution, arranging the first circuit board in the first housing can further protect the first circuit board and reduce the risk of damage to the first circuit board during maintenance of the battery module.

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 the maintenance of the second circuit board.

In some embodiments, the second circuit board is connected to the first housing. In this solution, compared with the second circuit board being connected to the second housing, the probability of tearing the cable connected to the second circuit board when the first housing is disassembled can be effectively reduced.

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 disposed in the first recess. In this solution, the structure of the first recess can improve the protection effect of the second circuit board.

In some embodiments, a first connection part is further provided between the first housing and the second housing. The first connection part is connected to the first housing, and the first connection part and the first recess jointly define an accommodation cavity. , the second circuit board is located in the accommodation cavity. In this solution, the first connection part and the first recessed part are used to define a relatively closed accommodation cavity, which can further improve the protection effect of the second circuit board.

In some embodiments, the first connection part 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 material of the first connection part is a transparent material. In this solution, the first connection part has at least a partially transparent part facing the second circuit board, so that the operator can observe the status of the components on the second circuit board without taking out the second circuit board, and facilitate inspection of the second circuit board. The circuit board is inspected.

In some embodiments, the battery module further includes an insulating part, and the insulating part wraps the second circuit board. In this solution, the second circuit board is wrapped with an insulating part, which can further protect the second circuit board.

In some embodiments, the insulation part is made of transparent material. In this solution, the operator can observe the status of the components on the second circuit board without taking out the second circuit board, which facilitates maintenance of the second circuit board.

In some embodiments, the insulation part is made of silicone gel. In this solution, the material of the insulating part enables the insulating part wrapping the second circuit board to be removed when the second circuit board needs to be inspected, so as to facilitate the inspection of the second circuit board.

In some embodiments, the first connection part is provided with a first opening, and the first opening is connected to the accommodation cavity. In this solution, the provision of the first opening can facilitate the introduction of the insulating part into the accommodation cavity.

In some embodiments, the first connecting portion is provided with a second recess facing the wall of the second housing, and the second recess is provided with the first opening facing the bottom wall of the second housing. In this solution, the structure providing the second recess can facilitate sealing of the first opening.

In some embodiments, the first connection part includes an inner wall facing the accommodation cavity, the inner wall is provided with ribs, the ribs enclose a plurality of grid grooves, the ribs are provided with second openings, and the second openings are conductive Each grid slot. In this solution, the second opening can facilitate the insulating portion to fill each grid slot.

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 into the accommodation cavity can be further increased.

In some embodiments, a protruding portion is provided on a wall of the first housing facing the second housing, and the protruding portion encloses the first recess. In this solution, the first concave portion is enclosed by the protruding portion, which can reduce the wall thickness of the first housing and reduce the space occupied by the first housing.

In some embodiments, the second circuit board and the battery pack are arranged along the third direction, the first housing has a first wall, and the second circuit board is connected to the first wall of the first housing. 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. The second wall is provided where the battery core group is provided with the first wall. One side of the electronic device. 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 convenient for the second wire harness to extend toward the second end edge of the battery core group.

In some embodiments, the first recessed portion includes a first portion located on the first wall and a second portion located on the third wall. The first portion communicates with the second portion, and the second wire harness extends from the first portion to the third portion in the first recessed portion. Part Two. In this solution, it can further facilitate the extension of the second wire harness toward the second end edge of the battery core group.

In some embodiments, along the first direction, the first housing has a fourth wall surface and a fifth wall surface distributed opposite to each other, and the first circuit board is disposed between the fourth wall surface and the battery core group. The shortest distance of the second part from the fourth wall is L5, and the shortest distance from the fifth wall is L6, where L5<L6. In this way, the second wire harness can be easily extended toward the first circuit board.

In some embodiments, the second circuit board includes electronic components used for charge and discharge management of the battery. In this solution, the electronic components on the first circuit board can be reduced, and the processing cost and processing difficulty of the first circuit board can be reduced.

A second aspect of the application also provides an electrical device, including any of the above battery modules.

The battery module in this application adds a second circuit board. The first circuit board is used to charge and discharge the battery module. The second circuit board is separated from the first circuit board, and a second wiring harness is used between the two. Make electrical connections. 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 the first electronic device needs to be repaired and inspected, the first electronic device and the second circuit board can be disassembled for inspection. In this way, the risk of damage to the first circuit board and the electronic components on the battery during the process of disassembling the first circuit board is reduced, and the maintenance of the battery module is facilitated.

Description of the drawings

In order to explain the technical solutions of the embodiments of the present application more clearly, the drawings required to be used in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. Those of ordinary skill in the art can also obtain other drawings based on the drawings.

Figure 1 is a schematic three-dimensional view from a first perspective of a battery module provided by the first embodiment of the present application;

Figure 2 is a perspective view of the battery module provided by the first embodiment of the present application from a second perspective;

Figure 3 is an exploded schematic diagram of the battery module provided by the first embodiment of the present application;

Figure 4 is a schematic perspective view of the battery module provided by the first embodiment of the present application with the second case removed from the first perspective;

Figure 5 is a schematic side view of the battery module provided by the first embodiment of the present application, with the second case removed, viewed along the direction Z;

6 is a schematic side view of the combination of the second circuit board, the first wire harness, the second wire harness, the third wire harness and the fourth wire harness provided by the first embodiment of the present application, viewed along the direction Z; the first wire harness is omitted. , the ends of the second wire harness, the third wire harness and the fourth wire harness facing away from the second circuit board;

Figure 7 is a schematic side view of the second circuit board in the battery module according to the first embodiment of the present application, viewed along direction Z;

Figure 8 is a schematic side view of the battery module provided by the first embodiment of the present application, with the second casing removed, viewed in the opposite direction of direction Y;

Figure 9 is a schematic side view of the battery module provided by the first embodiment of the present application, with the second case removed, viewed along the direction Y;

Figure 10 is a schematic side view of the battery module provided by the first embodiment of the present application, with the second casing removed, viewed in the opposite direction of direction Z;

Figure 11 is a schematic side view of the battery module provided by the first embodiment of the present application, with the second casing removed, viewed in the opposite direction of direction X;

Figure 12 is a schematic side view of the battery module provided by the first embodiment of the present application, with the second case removed, viewed along the direction X;

Figure 13 is a three-dimensional schematic view of the battery core of the battery module provided by the first embodiment of the present application;

Figure 14 is a first side schematic view of the battery cell of the battery module provided by the first embodiment of the present application;

Figure 15 is a second schematic side view of the battery cell of the battery module provided by the first embodiment of the present application;

Figure 16 is a schematic perspective view of the battery module provided by the first embodiment of the present application from a first perspective, with the first case and the second case removed;

Figure 17 is a schematic side view of the battery module provided by the first embodiment of the present application, with the first casing and the second casing removed, viewed along the direction Z;

Figure 18 is a schematic side view of the battery module provided by the first embodiment of the present application, with the first casing and the second casing removed, viewed along the direction Y;

Figure 19 is a schematic side view of the battery module provided by the first embodiment of the present application, with the first casing and the second casing removed, viewed along the direction X;

Figure 20 is a schematic side view of the battery module provided by the first embodiment of the present application, with the first case and the second case removed, viewed in the opposite direction of direction Z;

Figure 21 is a schematic side view of the battery module provided by the first embodiment of the present application, with the first case and the second case removed, viewed in the opposite direction of direction Y;

Figure 22 is a schematic side view of the battery module provided by the second embodiment of the present application, with the first case and the second case removed, viewed along the direction Z;

Figure 23 is a schematic side view of the battery module provided by the third embodiment of the present application, with the first case and the second case removed, viewed along the direction Z;

Figure 24 is a schematic side view of the battery module provided by the fourth embodiment of the present application, with the first case and the second case removed, viewed along the direction Z;

Figure 25 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 the direction Z;

Figure 26 is a schematic three-dimensional view of the first housing and its internal components in the battery module provided by the first embodiment of the present application;

Figure 27 is a partial enlarged schematic diagram of position A in Figure 26;

Figure 28 is a schematic three-dimensional view of the combination of the first connection part, the first housing and its internal components in the battery module provided by the first embodiment of the present application;

Figure 29 is a partial enlarged schematic view of B in Figure 28;

Figure 30 is a schematic perspective view of the first connection portion in the battery module provided by the first embodiment of the present application from a first perspective;

Figure 31 is a schematic perspective view of the first connection part in the battery module provided by the first embodiment of the present application from a second perspective;

Figure 32 is a partial enlarged schematic view of C in Figure 31;

Figure 33 is a schematic three-dimensional view of the first connection portion in the battery module provided by the first embodiment of the present application from a third perspective;

Figure 34 is a full cross-sectional view of the battery module provided by the first embodiment of the present application, with the second case removed and viewed in the opposite direction of direction X;

Figure 35 is a partial enlarged schematic view of D in Figure 34;

Figure 36 is a partially cutaway schematic view of the battery module provided by the first embodiment of the present application, with the second case removed and viewed in the opposite direction of direction Y;

Figure 37 is a partial enlarged schematic view of E in Figure 36;

Figure 38 is a partial enlarged schematic view of F in Figure 37;

Figure 39 is a schematic three-dimensional view of the combination of the second wiring harness, connectors and buffers in the battery module provided by the first embodiment of the present application;

Figure 40 is a schematic three-dimensional view of the combination of connectors and buffers in the battery module provided by the first embodiment of the present application;

Figure 41 is an exploded schematic diagram of the combination of connectors and buffers in the battery module provided by the first embodiment of the present application.

Detailed ways

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

Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by a person skilled in the technical field belonging to this application. The terms used in the description of this application are only for the purpose of describing specific embodiments and are not used to limit this application. As used in this specification, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The battery module has a circuit board (BMS board) used for battery charge and discharge management. The BMS board is electrically connected to electronic equipment used for charge and discharge or electronic equipment connected to external communication (each electronic equipment is collectively referred to as a connector). In the related art, the arrangement position of the connector is limited by the position arrangement of the BMS board. Once the position of the BMS board is determined, it is difficult to flexibly arrange the connectors.

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

Referring to FIGS. 13-16 , the battery cell group 10 includes at least one battery cell 17 . Each battery core 17 includes a main body 172 and an electrode terminal 171 . The electrode terminal 171 extends from the main body 172 . The electrode terminal 171 includes a positive terminal 171a and a negative terminal 171b. The main body portion 172 of the battery core 17 includes a battery core casing, an electrode assembly and an electrolyte solution. The electrode assembly and electrolyte solution are contained in the battery core casing. The electrode assembly includes a positive electrode piece, a negative electrode piece and an isolation film. The isolation film is disposed between the positive electrode piece and the negative electrode piece. The battery core 17 mainly relies on metal ions to move between the positive electrode piece and the negative electrode piece. One end of the electrode terminal 171 extends to the outside of the cell housing and is used for electrical connection with an external circuit. The other end of the electrode terminal 171 extends into the interior of the cell housing and is used for electrical connection with the electrode assembly. The electrode terminal 171 is used to electrically connect the electrode assembly with an external circuit to realize charging and discharging of the battery core 17 . In some embodiments, the battery core 17 includes a first surface 1701 and a second surface 1702. The first surface 1701 and the second surface 1702 are two surfaces oppositely arranged along the second direction Y of the battery core 17. The electrode terminal 171 The battery core housing is extended along the first direction X, the first direction X and the second direction Y are perpendicular to each other, and the second direction Y is the stacking direction of each battery core 17 .

Exemplarily, the cell housing is made of aluminum plastic film. The battery core 17 may be a lithium ion battery cell, a sodium lithium ion battery cell, a sodium ion battery cell, a magnesium ion battery cell or other types of battery cells, which are not limited in the embodiments of the present application. Optionally, the battery core 17 is a soft-packed battery core.

The number of battery cores 17 is not limited in this embodiment. The number of battery cores 17 may be one, two, or more than two. When the number of battery cores 17 is two or more, each battery core 17 can be arranged in a single direction or in two directions that cross each other (specifically, they can be vertical). The plurality of electric cores 17 may be connected in series, in parallel, or in mixed connection, where mixed connection simply means that the connection of each electric core 17 includes series connection and parallel connection. Optionally, when each battery core 17 is arranged along a single direction, the second surface 1702 of the first battery core 17 located at the end of the battery core group 10 is the same as the second surface 1702 of the adjacent second battery core 17 . The first surface 1701 is in contact, the second surface 1702 of the second battery core 17 is in contact with the first surface 1701 of the adjacent third battery core 17 , and the plurality of battery cores 17 are arranged in sequence and so on to form the battery core group 10 . The direction in which each battery core 17 in the battery core group 10 is arranged is the same as the second direction Y. Regardless of whether the cells 17 are arranged in a single direction or in two intersecting directions, the electrode terminals 171 of each cell 17 can extend toward the same side or different sides of the cell group 10 . The shape and structure of the battery core 17 is not limited in this embodiment. It can be roughly a regular rectangular parallelepiped or a cylinder, or it can also be other special-shaped structures. For the convenience of description, in the following embodiments, a structure in which the battery core group 10 includes a plurality of battery cells 17 arranged in a single direction, and the electrode terminals 171 of each battery core 17 all extend toward the same side of the battery core group 10 is taken as an example. illustrate.

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 may have at least one function of overcharge protection, overdischarge protection, charging overcurrent protection, discharge overcurrent protection, short circuit protection, temperature protection or equalizing voltage. The first circuit board 20 can collect information such as voltage, current, temperature or capacity of the battery core 17 in real time. Referring to FIGS. 13-16 , in one embodiment, the first circuit board 20 and the battery core group 10 are arranged along the first direction X. The first circuit board 20 may be disposed on one side of the battery core set 10 . In order to facilitate electrical connection between the first circuit board 20 and the electrode terminals 171 of each battery core 17 on the battery core set 10 , the first circuit board 20 may be disposed on one side of the battery core set 10 . The side from which each electrode terminal 171 of the core group 10 extends. In another embodiment, in order to meet other requirements, the first circuit board 20 can also be arranged on other sides of the battery pack 10 . The first direction Group 10 is oriented to a first direction X used as a reference.

For convenience of description, this application uses the first direction X as a reference to define a second direction Y perpendicular to the first direction X, and a third direction Z perpendicular to the first direction X and the second direction Y respectively. That is, the first direction X, the second direction Y, and the third direction Z correspond to each other and are perpendicular to each other. Referring to FIG. 16 , in one embodiment, the second direction Y is the stacking direction of each battery core 17 .

Referring to FIGS. 17-21 , the battery core group 10 includes a plurality of battery cores 17 stacked in a single direction. The battery pack 10 has six end sides. Each end side of the battery pack 10 is now defined as follows: the battery pack 10 has a first end side 11, a second end side 12, a third end side 13, and a fourth end side. side 14, the fifth end side 15 and the sixth end side 16. The first end side 11 and the second end side 12 are arranged oppositely, and the first end side 11 and the second end side 12 are relatively distributed along the second direction Y. The third end side 13 and the fourth end side 14 are arranged oppositely, and the third end side 13 and the fourth end side 14 are relatively distributed along the first direction X. The fifth end side 15 and the sixth end side 16 are relatively arranged, and the fifth end side 15 and the sixth end side 16 are relatively distributed along the third direction Z.

The relative positional relationship between the above end edges and each battery core 17 in the battery core group 10 can be determined according to actual needs. The electrode terminal 171 of each battery core 17 may extend from the first end edge 11 of the battery core set 10 , or may extend from the second end edge 12 or other end edge of the battery core set 10 . In order to facilitate understanding, the present application illustrates an example in which the electrode terminals 171 of each battery core 17 are all extended from the third end edge 13 of the battery core group 10 . When the first circuit board 20 is disposed on the side of the lead-out electrode terminal 171 of the battery pack 10 , the first circuit board 20 is disposed on one side of the third end 13 of the battery pack 10 .

In some embodiments, viewed along the third direction Z, the second circuit board 30 has oppositely arranged first edges 3011 and second edges 3012 in the second direction Y, and the second circuit board 30 has oppositely arranged first edges 3011 and second edges 3012 in the first direction X. There is a third edge 3013 and a fourth edge 3014 arranged oppositely. 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 close to the first electronic device 41 in the second direction Y is the first edge 3011 , and the other edge of the second circuit board 30 in the second direction Y is the second edge 3011 . Edge 3012, the edge of the second circuit board 30 close to the electrode terminal 171 of each battery core 17 in the first direction X is the third edge 3013, and the other edge of the second circuit board 30 in the first direction X is the fourth edge 3012. edge3014.

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 wire harness 92 is electrically connected to the first circuit board 20 , and the second end of the second wire harness 92 is electrically connected to the second circuit board 30 , thereby realizing the connection between the second circuit board 30 and the first circuit board 20 . Electrical connection. The first circuit board 20 and the second circuit board 30 are located apart from each other and are electrically connected through the second wire harness 92 . Alternatively, the first circuit board 20 and the second circuit board 30 can be electrically connected through the second wire harness 92 Signal transmission. Optionally, the first circuit board 20 and the second circuit board 30 can realize power transmission through the second wire harness 92 .

In some embodiments, as shown in FIG. 17 , when viewed along the third direction Z, the shape of the second circuit board 30 is approximately rectangular, and the length of the second circuit board 30 in the first direction X is H1. 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 first edge 3011 and the second edge 3012 are in the first direction X. The distance in the two directions Y is h1, which satisfies H1≥h1, or H1≤h1. In this embodiment, the length H1 of the second circuit board 30 in the first direction The connector or wire harness realizes the electrical connection between the second circuit board 30 and other components.

The relative position of the second circuit board 30 and the battery core group 10 can be determined according to actual needs. For example, the second circuit board 30 can be arranged with the battery core group 10 along the first direction X, and the second circuit board 30 can be aligned with the first direction X. A circuit board 20 is disposed on the same side of the battery pack 10. For example, the second circuit board 30 and the first circuit board 20 can both be disposed on the third end side 13 of the battery pack 10, which is beneficial to the first circuit board 20. connections between the second circuit boards 30 . Or the second circuit board 30 can be arranged on the fifth end side 15 side of the battery core group 10, or/and the first circuit board 20 can be arranged on the sixth end side 16 side of the battery core group 10, which is beneficial to reducing the Interaction between electronic components on one circuit board 20 and electronic components on the second circuit board 30 . Optionally, the second circuit board 30 can also be arranged with the battery core group 10 along the third direction Z. The second circuit board 30 can be disposed on either side of the battery core group 10 along the third direction Z, which is beneficial to Reducing the mutual influence between the electronic components on the first circuit board 20 and the electronic components on the second circuit board 30 is beneficial to the mutual connection between the first circuit board 20 and the second circuit board 30 . Optionally, the second circuit board 30 is disposed on the side of the battery pack 10 opposite to the first circuit board 20. For example, when the first circuit board 20 is disposed on the third end side 13 of the battery pack 10, The second circuit board 30 may be disposed on the fourth end side 14 of the battery pack 10 . In one embodiment, the second circuit board 30 and the battery core set 10 are arranged along the first direction X, and the second circuit board 30 is arranged on the side of the battery core set 10 opposite to the first circuit board 20 . That is, when the first circuit board 20 is disposed on the third end side 13 of the battery pack 10 , the second circuit board 30 can be disposed on the fourth end side 14 of the battery pack 10 . In another embodiment, referring to FIGS. 17-21 , the second circuit board 30 and the battery core group 10 are arranged along the third direction Z. That is, when the first circuit board 20 is disposed on the third end side 13 side of the battery pack 10 , the second circuit board 30 can be disposed on the fifth end side 15 side or the sixth end side 16 side of the battery pack 10 . .

The first electronic device 41 can also be arranged in different orientations from the first circuit board 20. In one embodiment, the first electronic device 41 can be arranged along the second direction Y with the battery pack 10. The first electronic device 41 can be arranged On the side of the first end 11 or the second end 12 of the battery pack 10, in another embodiment, the first electronic device 41 can also be arranged along the third direction Z with the battery pack 10. The first The electronic device 41 may be arranged on the fifth end side 15 side or the sixth end side 16 side of the battery pack 10 . In one embodiment, the first electronic device 41 may be arranged on the sixth end side 16 of the battery core group 10 opposite to the second circuit board 30 .

The first electronic device 41 can be a device for the battery module 1 to communicate with the outside world. Specifically, it can be a communication device for wired or wireless communication with the outside world, an interface or plug for charging, an interface or plug for discharging, or a signal. Devices such as indicator lights or displays that indicate. In one embodiment, the first electronic device 41 and the battery pack 10 are arranged along the second direction Y, which is beneficial for the first electronic device 41 to be away from the first circuit board 20 and can lower the weight of the first electronic device 41 and the first circuit board 20 signal interference between the first electronic device 41 and the second circuit board 30; at the same time, it is also beneficial to keep the first electronic device 41 away from the second circuit board 30, which can reduce the signal interference between the first electronic device 41 and the second circuit board 30, which is beneficial to the second circuit board 30 More layout space.

Referring to Figures 17-21, in one embodiment, the first circuit board 20 is disposed on the side where the third end edge 13 of the battery core set 10 is located, and the second circuit board 30 is disposed on the fifth end edge of the battery core set 10. 15 is located on the side where the first electronic device 41 is located on the side where the first end edge 11 of the battery pack 10 is located, and the second wire harness 92 extends from the second circuit board 30 to the second end edge 12 side. The second wire harness 92 extends away from the first electronic device 41 . The mutual interference between the second wire harness 92 and the first wire harness 91 is reduced, and the wire harness arrangement is more regular.

In the related art, the first electronic device 41 and the BMS board are electrically connected using a wire harness (similar to the first electronic device 41 and the first circuit board 20 in the present application are electrically connected using a wire harness). Differentiatingly, an embodiment , the first electronic device 41 and the second circuit board 30 are electrically connected using the first wire harness 91, thereby realizing the electrical connection between the first electronic device 41 and the first circuit board 20, and further realizing the electrical connection between the first electronic device 41 and the second circuit board 30. Signal transmission between a circuit board 20. In another embodiment, the first electronic device 41 and the second circuit board 30 are electrically connected using the first wire harness 91 , and there is signal transmission only between the first electronic device 41 and the second circuit board 30 , and between the first electronic device 41 and the first circuit board 30 . There is no signal transmission between boards 20.

A second circuit board 30 is added in this application. After the position of the first circuit board 20 is fixed, the arrangement position of the second circuit board 30 can be adjusted to facilitate the placement of the first electronic device 41. The first electronic device The layout of 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 cell in the battery module, the maintenance process of the BMS board also causes the electrode terminals to desolder. After the electrode terminals are desoldered, the entire battery pack needs to be disassembled before repair welding (re-soldering the desoldered electrode terminals). On the one hand, this maintenance process is extremely troublesome; on the other hand, this maintenance process can easily cause secondary damage to the BMS board. In summary, battery modules in the prior art have troublesome maintenance problems. In this application, the first circuit board 20 is used for charge and discharge management of the battery module 1 , the second circuit board 30 is separated from the first circuit board 20 , and the second wiring harness 92 is used to electrically connect the two. 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 fails and the first electronic device 41 needs to be repaired and inspected, the first electronic device 41 and the second circuit board 30 only need to be disassembled for inspection, and the first circuit board 20 does not need to be disassembled or inspected. In this way, the risk of damage to the first circuit board 20 and the electronic components on the first circuit board 20 during the process of disassembling or repairing the first circuit board 20 is reduced, and the maintenance of the battery module 1 is facilitated. There is no need to install too many electronic components on the second circuit board 30, and the risk of damage is low when it is disassembled and inspected, so the maintenance is more convenient.

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 second edge of the second circuit board 30. The distance between 3012 and the second end edge 12 along the second direction Y satisfies L2<L1. In this solution, the second circuit board 30 is closer to the second end 12 than the first end 11 , which makes it easier to arrange the electronic equipment at the second end 12 .

In one embodiment, when the second circuit board 30 and the battery core group 10 are arranged along the third direction Z, and the second circuit board 30 is arranged on the fifth end side 15 of the battery core group 10, L3 is defined as the second The distance between the third edge 3013 of the circuit board 30 and the third end edge 13 along the first direction X, 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 L4. In this solution, the second circuit board 30 is closer to the third end side 13 , which makes it easier to arrange the electronic equipment at the third end side 13 . The second circuit board 30 can also be disposed closer to the first circuit board 20 , which can facilitate the second wire harness 92 to electrically connect the first circuit board 20 and the second circuit board 30 . In this embodiment, 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 , and both the first electronic device 41 and the second electronic device 42 are located in the battery pack 10 The first end side 11 of the battery pack 10 and the third electronic device 43 are located at the second end side 12 of the battery pack 10. The first electronic device 41 and the second electronic device 42 are arranged opposite to 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 smaller 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 distance.

Referring to Figures 21-22, in one embodiment, viewed from the third direction Z, along the second direction Y, the second circuit board 30 can also be located at the middle position of the fifth end edge 15 of the battery pack 10, that is, the second The distance L1 between the circuit board 30 and the first end 11 is equal to the distance L2 between the second circuit board 30 and the second end 12 . At this time, along the first direction X, the distance L3 between the second circuit board 30 and the third end side 13 is smaller than the distance L4 between the second circuit board 30 and the fourth end side 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 , and both the first electronic device 41 and the second electronic device 42 are located at the first end 11 of the battery pack 10 , the third electronic device 43 is located at the second end side 12 of the battery pack 10 , and the first electronic device 41 and the second electronic device 42 are arranged opposite to 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 of the second circuit board 30 3011 distance.

Referring to Figure 23, in one embodiment, along the second direction Y, the second circuit board 30 can also be located near the first end 11 of the battery core group 10, and the distance between the second circuit board 30 and the first end 11 is The distance L1 is smaller than the distance L2 between the second circuit board 30 and the second end edge 12 . At this time, along the first direction X, the distance L3 between the second circuit board 30 and the third end side 13 is smaller than the distance L4 between the second circuit board 30 and the fourth end side 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 , and both the first electronic device 41 and the second electronic device 42 are located at the first end of the battery pack 10 On the side 11 , the third electronic device 43 is located on the second end side 12 of the battery pack 10 . The first electronic device 41 and the second electronic device 42 are arranged opposite to 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 distance.

Referring to FIGS. 6-7 , the first wire harness 91 is electrically connected to 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, the first surface 301 and the second surface 302 being arranged oppositely. Alternatively, the first surface 301 of the second circuit board 30 can face the battery core group 10, and the second surface 302 of the second circuit board 30 can face away from the battery core group 10. The first wire harness 91 is electrically connected to the second surface 302 of the second circuit board 30 . In one embodiment, the first wire harness 91 includes a first wire 911 and two first connection devices 912 respectively located at both ends of the first wire 911 . The first end of the first wire 911 is electrically connected to one of the first connection devices 912 , and the first connection device 912 is electrically connected to the first electronic device 41 . The second end of the first wire 911 is electrically connected to another first connection device 912 , and the first connection device 912 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 first plug-in device 913 is welded to the first electronic circuit board 30. The device 41 is connected such that the first wire harness 91 is detachably electrically connected to the first electronic device 41 and the second circuit board 30 respectively. Optionally, the first connection device 912 includes a connector. Optionally, the first plug device 913 includes a connector.

The second wire harness 92 is electrically connected to the first circuit board 20 and the second circuit board 30 respectively. In one embodiment, the second wire harness 92 includes a second wire 921 and two second connection devices 922 respectively located at both ends of the second wire 921 . One end of the second wire 921 is electrically connected to one of the second connection devices 922 , and the second connection device 922 is electrically connected to the first circuit board 20 . The other end of the second wire 921 is electrically connected to another second connection device 922 , and the second connection device 922 is electrically connected to the second circuit board 30 . In another embodiment, the battery module 1 further includes two second plug-in devices 923, one of which is welded to the second circuit board 30, and the other second plug-in device 923 is welded to the first circuit board 30. Board 20 is welded. The two second connection devices 922 are respectively plugged into the two second plug devices 923 in one-to-one correspondence, so that the second wire harness 92 is electrically connected to the first circuit board 20 and the second circuit board 30 respectively. Optionally, the second connection device 922 includes a connector. Optionally, the second plug device 923 includes a connector.

Viewed along the third direction Z, the connection positions of the first wire harness 91 and the second wire harness 92 to the second circuit board 30 may be located on the same side of the second circuit board 30 or on different sides. In some embodiments, the connection positions of the first wire harness 91 and the second wire harness 92 with the second circuit board 30 are located on different sides of the second circuit board 30 , and the first wire harness 91 and the second wire harness 92 are connected along the second circuit board 30 . The two directions Y are arranged oppositely, wherein along the second direction Y, the first connecting device 912 and the second connecting device 922 have overlapping portions in the second direction Y. It is beneficial to make full use of the installation space of the second circuit board 30. The surface of the second circuit board 30 has a compact location for parts installation, which is beneficial to reducing the size of the second circuit board 30 in the first direction X.

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

The second circuit board 30 includes a first electrical connection part 33 and a second electrical connection part 34 . The first electrical connection part 33 and the second electrical connection part 34 are structures such as pads or welding holes on the second circuit board 30 for electrical connection with external components outside the second circuit board 30 . The first wire harness 91 is electrically connected to the first electrical connection part.

Referring to FIG. 7 , along the second direction Y, the first wire harness 91 is electrically connected to the first electrical connection part 33 . The distance between the first electrical connection part 33 and the first side part 31 is S1 . The first electrical connection part 33 The distance from 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 the aforementioned S1, and the first electrical connection portion 33 is closest to The distance between the end of the second side portion 32 and the second side portion 32 is the aforementioned S2. Optionally, S1<S2 facilitates the electrical connection between the first wire harness 91 and the first electrical connection part 33 .

The second wire harness 92 is electrically connected to the second electrical connection part 34. The distance between the second electrical connection part 34 and the first side part 31 is S3. The distance between the second electrical connection part 34 and the second side part 32 is S3. S4. Along the second direction Y, the distance 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 second electrical connection portion 34 is closest to the second side. The distance between the end of the side portion 32 and the second side portion 32 is the aforementioned S4. Optional, S4<S3. It is advantageous for the second wire harness 92 to be electrically connected to the second electrical connection part 34 . In one embodiment, S1<S2, the relationship between S3 and S4 is not limited and depends on actual requirements. The first wire harness 91 extends toward the direction of the first end 11 , and is connected to the second circuit board 30 closer to the first side portion 31 . This can match the layout position of the first wire harness 91 and save the first cost. The material of the wire harness 91 facilitates the first wire harness 91 to extend toward the first end 11 of the battery core group 10 . In another embodiment, S4 < S3, the relationship between S1 and S2 is not limited and depends on actual needs. The second wire harness 92 extends toward the direction of the second end edge 12 . Therefore, the second wire harness 92 is connected to a portion of the second circuit board 30 closer to the second side portion 32 , which can match the layout position of the second wire harness 92 and save the cost of the second wire harness 92 . The material of the second wire harness 92 facilitates the second wire harness 92 to extend toward the second end 12 of the battery pack 10 . In yet another embodiment, S1<S2, and S4<S3. The first wire harness 91 is connected to a portion of the second circuit board 30 closer to the first side portion 31 , and the second wire harness 92 is connected to a portion of the second circuit board 30 closer to the second side portion 32 . The layout position of the first wire harness 91 can be matched, the material of the first wire harness 91 can be saved, and the first wire harness 91 can be easily extended to the first end edge 11 of the battery core group 10 . At the same time, the layout position of the second wire harness 92 can be matched, the material of the second wire harness 92 can be saved, and the second wire harness 92 can be easily extended to the second end edge 12 of the battery core group 10 .

In one embodiment, referring to FIG. 7 , along the second direction Y, the first electrical connection part 33 and the second electrical connection part 34 have overlapping parts, and the third electrical connection part 35 and the fourth electrical connection part 36 have overlapping parts. Along the first direction X, the first electrical connection part 33 and the third electrical connection part 35 have overlapping parts, and the second electrical connection part 34 and the fourth electrical connection part 36 have overlapping parts.

Referring to FIGS. 17-21 , the battery module 1 may include only one electronic device, that is, 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 wire harness 93 . The second electronic device 42 is separated from the first electronic device 41 , the first end of the third wire harness 93 is electrically connected to the second electronic device 42 , and the second end of the third wire harness 93 is electrically connected to the second circuit board 30 . The second electronic device 42 is disposed on the first end side 11 of the battery pack 10 . In this solution, the battery module 1 has a first electronic device 41 and a second electronic device 42. The first electronic device 41 and the second electronic device 42 are both electrically connected to the second circuit board 30. The first electronic device 41 and the second electronic device 42 are electrically connected to the second circuit board 30. The electronic devices 42 are all arranged on the first end edge 11 of the battery pack 10 . The first electronic device 41 and the second electronic device 42 are distributed along the second direction Y with the battery pack 10 , so that the battery module can be fully utilized. The space on the side of the first end 11 of the battery pack 10 in 1 improves the space utilization of the battery module 1 and increases the energy density of the battery module 1 .

In some embodiments, the installation position of the third wire harness 93 on the second circuit board 30 can be set according to actual needs, and the third wire harness 93 and the first wire harness 91 can be installed on the same side of the second circuit board 30 parts or different sides. In some embodiments, both the first wire harness 91 and the third wire harness 93 are installed on the same side of the second circuit board 30 . Viewed along the third direction Z, the first wire harness 91 and the third wire harness 93 have overlapping portions in the first direction There is partial overlap. In this way, both the first wire harness 91 and the third wire harness 93 can directly extend toward the same side of the battery pack 10 so that the first wire harness 91 is directly connected to the first electronic device 41 and the third wire harness 93 is directly connected to the second electronic device 42 connect. In some embodiments, both the first wire harness 91 and the third wire harness 93 are connected to the same side of the second circuit board 30 close to the first end edge 11 , which is beneficial to reducing the size of the first wire harness 91 and the third wire harness 93 . length.

When the battery module 1 includes multiple electronic devices, the types of the electronic devices may be the same or different. For example, when the battery module 1 includes a first electronic device 41 and a second electronic device 42, the first electronic device 41 and When the second electronic device 42 is of the same type, the first electronic device 41 and the second electronic device 42 may both be charge and discharge interfaces or wireless communication devices, etc. 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 may be a signal transmission module, and the second electronic device 41 may be a signal transmission module. 42 includes a connector 80 configured for charging and discharging the battery pack 10 , that is, the second electronic device 42 may be an interface or plug for charging. 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.

In one embodiment, when viewed along the second direction Y, the first electronic device 41 at least partially overlaps the second circuit board 30 . In this solution, the two ends of the first wire harness 91 can be connected to the second circuit board 30 and the first electronic device 41 respectively.

In some embodiments, when viewed along the second direction Y, the distance between the first electronic device 41 and the second circuit board 30 is beneficial to providing more layout space for the first electronic device 41 and is conducive to the location arrangement of the first electronic device 41 .

Referring to Figures 5-7, when the battery module 1 has a second electronic device 42, the second circuit board 30 also includes a third electrical connection part 35. The third electrical connection part 35 may be a soldering pad on the second circuit board 30. or welding holes. The third wire harness 93 is welded to the third electrical connection part 35. The shortest distance between the third electrical connection part 35 and the first side part 31 is S5, and the shortest distance between the third electrical connection part 35 and the second side part 32 is S6. S5<S6. The distance between the third electrical connection part 35 and the first side part 31 is closer than the distance between the third electrical connection part 35 and the second side part 32 . In this solution, the arrangement position of the third electrical connection portion 35 can further match the extension direction of the third wire harness 93 and reduce the waste of material of the third wire harness 93 .

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 both disposed on the first end edge 11 of the battery pack 10, an embodiment , along the first direction X, the second electronic device 42 is disposed on the side of the first electronic device 41 away from the first circuit board 20 . That is, the first electronic device 41 is closer to the third end edge 13 of the battery pack 10 than the second electronic device 42 . It is more conducive to the positional arrangement of the first wire harness 91 and the third wire harness 93, and the first wire harness 91 and the third wire harness 93 are less likely to be entangled.

In one embodiment, the second circuit board 30 further includes a fourth electrical connection part 36 , and the fourth electrical connection part 36 is a welding pad or a welding hole or other structure on the second circuit board 30 . The battery module 1 further includes a fourth wire harness 94 , one end of the fourth wire harness 94 is welded to the fourth electrical connection part 36 , and the other end extends to the second end edge 12 . The fourth electrical connection part 36 is electrically connected to the third electrical connection part 35 . In this solution, a fourth wire harness 94 extending toward the second end edge 12 is also provided. The fourth wire harness 94 is electrically connected to the second circuit board 30 so that the second circuit board 30 is close to the side of the first end edge 11 and the second circuit board 30 . There are circuit leads on the side of the second circuit board 30 close to the second end edge 12 , which improves the space utilization on the second circuit board 30 .

In some embodiments, the battery module 1 further includes a third electronic device 43 , and the third electronic device 43 is electrically connected to an end of the fourth wire harness 94 away from the second circuit board 30 . In this solution, the first electronic device 41 located at the first end 11 and the third electronic device 43 located at the third end 13 are both electrically connected to the second circuit board 30 . Compared with not providing the second circuit board 30 Compared with the existing technology, the layout of the wiring harness is more regular.

In some embodiments, as shown in FIG. 5 , 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 Both are located at the first end 11 of the battery pack 10 , and the third electronic device 43 is located at the second end 12 of the battery pack 10 . Both the first electronic device 41 and the second electronic device 42 are in contact with the third electronic device 43 . The second direction Y is set relatively. In this embodiment, viewed from the third direction Z, 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 smaller than the first electronic device 41 (or the second electronic device 41 ). The distance from the device 42) to the first edge 3011 of the second circuit board 30.

In some embodiments, the installation position of the fourth wire harness 94 on the second circuit board 30 can be set according to actual needs, and both the fourth wire harness 94 and the third wire harness 93 can be installed on the same side of the second circuit board 30 parts or different sides. In some embodiments, the fourth wire harness 94 and the third wire harness 93 are installed on different sides of the second circuit board 30 . Specifically, the fourth wire harness 94 and the third wire harness 93 are respectively located on the second circuit board 30 On opposite sides of the fourth wire harness 94 and the third wire harness 93 , the fourth wire harness 94 and the third wire harness 93 are arranged opposite to each other in the second direction Y. The fourth wire harness 94 and the third wire harness 93 have an overlapping portion in the second direction Y. It is beneficial to make full use of the installation position of the second circuit board 30 and reduce the size of the second circuit board 30 in the first direction X to facilitate subsequent installation.

In some embodiments, as shown in FIG. 6 , the first wire harness 91 and the second wire harness 92 are disposed oppositely on both sides of the second circuit board 30 in the second direction Y, and the third wire harness 93 and the fourth wire harness 94 are on The first wire harness 91 and the third wire harness 93 are both located on the same side of the second circuit board 30 in the second direction Y. The second wire harness 92 and the fourth wire harness 94 are located opposite each other in the second direction Y. Both are located on the same side of the second circuit board 30 . The first wire harness 91 and the third wire harness 93 have an overlapping portion in the first direction X, and the first wire harness 91 and the second wire harness 92 have an overlapping portion in the second direction Y. The fourth wire harness 94 and the third wire harness 93 have an overlapping portion in the second direction Y, and the fourth wire harness 94 and the second wire harness 92 have an overlapping portion in the first direction X. Therefore, the installation positions of the first wire harness 91 , the second wire harness 92 , the third wire harness 93 and the fourth wire harness 94 on the second circuit board 30 are appropriately and compactly distributed, which is conducive to fully utilizing the installation positions on the surface of the second circuit board 30 use.

Referring to FIG. 7 , when the second circuit board 30 has a fourth wire harness 94 and the fourth wire harness 94 extends toward the second end edge 12 of the battery pack 10 , the fourth electrical connection portion 36 welded to the fourth wire harness 94 can be Closer to the second side portion 32 of the second circuit board 30 . The shortest distance between the fourth electrical connection part 36 and the first side part 31 is S7, and the shortest distance between the fourth electrical connection part 36 and the second side part 32 is S8. S7>S8. The distance between the fourth electrical connection part 36 and the second side part 32 is The distance between the fourth electrical connection part 36 and the first side part 31 is closer than the distance between the fourth electrical connection part 36 and the first side part 31 , which can match the extension direction of the fourth wire harness 94 and reduce the waste of material of the fourth wire harness 94 .

In one embodiment, referring to FIG. 17 , the second circuit board 30 and the battery core group 10 are arranged along the third direction Z. Along the first direction , which can reduce the space occupied by the second circuit board 30 and also facilitate the position arrangement of the second circuit board 30 .

In some embodiments, the second circuit board 30 and the battery core group 10 are arranged along the third direction Z. Viewed along the third direction Z, the second circuit board 30 is located in the battery pack 10 , which improves the space utilization in the battery module 1 .

Referring to FIGS. 1-5 , the battery module 1 also includes a first housing 50 and a second housing 60 . The first housing 50 is set outside the battery core group 10 and can be used to protect the battery core group 10 on the one hand and to fix electrical components related to the battery core group 10 on the other hand. In one embodiment, the second housing 60 serves as the outer shell of the battery module 1 . The second housing 60 is set outside the first housing 50 to protect the internal components of the battery module 1 . In other embodiments, the battery module 1 may also include other shells set outside the second shell 60 , which will not be described again here. In one embodiment, the first circuit board 20 is disposed in the first housing 50 . In this solution, disposing the first circuit board 20 in the first housing 50 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 .

In one embodiment, the first housing 50 includes two interconnected first sub-housings 501 and second sub-housings 502 . The first sub-casing 501 and the second sub-casing 502 can be distributed along the third direction Z. After the first sub-casing 501 and the second sub-casing 502 are connected, they can at least wrap the battery pack 10 and the first circuit board. 20 other components. The first sub-casing 501 and the second sub-casing 502 can be connected through buckles, adhesive material bonding, screw locking, etc.

In one embodiment, the second housing 60 may include two interconnected third sub-housings 601 and fourth sub-housings 602. The third sub-housings 601 and the fourth sub-housings 602 may be connected along a third direction. Z distribution, the third sub-case 601 and the fourth sub-case 602 are connected and wrap the internal components of the battery module 1 . The third sub-casing 601 and the fourth sub-casing 602 can be connected through buckles, adhesive material bonding, screw locking, etc.

In the embodiment shown in Figures 1-3, the arrangement direction of the first sub-casing 501 and the second sub-casing 502 is the same as the arrangement direction of the third sub-casing 601 and the fourth sub-casing 602. In other aspects, In the embodiment, the arrangement direction of the first sub-casing 501 and the second sub-casing 502 and the arrangement direction of the third sub-casing 601 and the fourth sub-casing 602 may be different. Illustratively, for example, the first sub-casing 501 and the second sub-casing 502 are arranged along the third direction Z, and the third sub-casing 601 and the fourth sub-casing 602 are arranged along the first direction X. When the arrangement direction of the first sub-case 501 and the second sub-case 502 is the same as the arrangement direction of the third sub-case 601 and the fourth sub-case 602, it is convenient for the first case 50 and the second case 60 assembly; when the arrangement direction of the first sub-casing 501 and the second sub-casing 502 is different from the arrangement direction of the third sub-casing 601 and the fourth sub-casing 602, the anti-fall of the battery module 1 is improved. The performance is better, and the possibility of the first housing 50 and the second housing 60 splitting simultaneously when the battery module 1 is dropped is reduced.

In one embodiment, the second circuit board 30 may be disposed between the first housing 50 and the second housing 60 . In this way, on the one hand, when the second circuit board 30 needs to be inspected, the second housing 60 only needs to be disassembled, so that during the above inspection process of the battery module 1, the first circuit board 20 is always located in the first position. The inside of the housing 50 is protected by the first housing 50 , which reduces the risk of damage to the first circuit board 20 . On the other hand, compared with the structure in which the second circuit board 30 is provided in the first housing 50, the structure in which the second circuit board 30 is provided between the first housing 50 and the second housing 60 makes For the maintenance of the second circuit board 30, only one housing is required to be disassembled, which improves the maintenance efficiency.

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 the first housing 50 or the second housing 60 . In one embodiment, the second circuit board 30 is connected to the first housing 50 . In this solution, compared with the second circuit board 30 being connected to the second housing 60 , the probability of tearing the cable connected to the second circuit board 30 when the first housing 50 is disassembled can be effectively reduced, and the second circuit board 30 is connected to the second housing 60 . The second housing 60 is difficult to disassemble.

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 aligned with the positioning hole. The holes are matched so that the second circuit board 30 is positioned on the first housing 50 . Then, threaded fasteners (such as screws) are used to connect the second circuit board 30 and the first housing 50 , so that the second circuit board 30 is fixed to the second housing 60 .

In one embodiment, referring to FIG. 4 and FIGS. 25-28 , a first recess 51 is provided on the wall surface 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 solution, 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 arranged, which is beneficial to reducing the impact of the first circuit board 30 on the second circuit board 30 at the same time. The housing 50 and the second housing 60 may be damaged due to excessive pressure.

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

Along the third direction Z, the depth dimension of the first recess 51 may be greater than the thickness dimension of the second circuit board 30 , or may be equal to or smaller than the thickness dimension of the second circuit board 30 . In order to enable the first recessed portion 51 to achieve a better protective effect, in one embodiment, the depth dimension of the first recessed portion 51 along the third direction is greater than the thickness dimension of the second circuit board 30 .

A first connection part 70 is also provided between the first housing 50 and the second housing 60 . The first connecting part 70 is connected to the first housing 50 . The first connecting part 70 and the first recessed part 51 jointly define an accommodating cavity 76 , and the second circuit board 30 is disposed in the accommodating cavity 76 . In this solution, the first connection part 70 and the first recess 51 are used to define a relatively closed accommodation cavity 76, which can further improve the protection effect of the second circuit board 30 and reduce the impact of the second circuit board 30 on the first housing. 50 and the pressing force of the second housing 60.

The first connection part 70 can be fixedly connected or detachably welded to the first housing 50 , where the fixed connection includes welding, fusion connection or glue connection, etc., and the detachable connection includes snap connection, plug connection, magnetic connection or Interference type connection, etc. In one embodiment, the first connection part 70 is detachably connected to the first housing 50, specifically by snap connection. The specific locking structure of the first connecting part 70 and the first housing 50 will not be described again here.

In one embodiment, the first connection part 70 includes a transparent area, and when viewed along the third direction Z, the transparent area at least partially coincides with the second circuit board 30 . That is to say, at least part of the transparent area of the first connecting portion 70 faces the second circuit board 30 . When viewed along the third direction Z, the maintenance personnel may only observe part of the second circuit board 30 , or may observe the entire second circuit board 30 . In one embodiment, the working status of at least some components on the first circuit board 20 can be observed without removing the first connecting portion 70 , which can improve the convenience of maintenance.

Furthermore, in order to be able to observe the working status of components in all parts of the second circuit board 30, in one embodiment, the material of the first connecting part 70 is a transparent material. The entire first connecting part 70 is in a transparent state, and the working state of the second circuit board 30 in the accommodating cavity 76 can be well observed from outside the first connecting part 70 .

In one embodiment, the battery module 1 further includes an insulating part (not shown in the figure), and the insulating part wraps the second circuit board 30 . In this solution, the second circuit board 30 is wrapped with an insulating part, which can further protect the second circuit board 30 .

In some embodiments, the insulation part is made of transparent material. In this solution, the operator can observe the status of the components on the second circuit board 30 without taking out the second circuit board 30 , which facilitates maintenance of the second circuit board 30 . The insulating part wraps the second circuit board 30, so when the insulating part is in an opaque state, the maintenance personnel can only indirectly obtain the working status of the second circuit board 30 by observing the state of the insulating part from outside the first connection part 70. For example, when the circuit on the second circuit board 30 breaks down and is short-circuited, the generated heat is conducted to the insulating part, causing the insulating part to degenerate after experiencing high temperature (for example, turning black after being exposed to high temperature). The maintenance personnel can observe the state of the insulating part. The working status of the second circuit board 30 is indirectly obtained.

In one embodiment, the insulating part may also be in a transparent state. At this time, the maintenance personnel can fully observe the working status of the second circuit board 30 from outside the first connection part 70 . The applicant also considered that when a fault is found on the second circuit board 30 , in order to repair the second circuit board 30 , it is necessary to remove the insulation covering the second circuit board 30 without damaging the second circuit board 30 during the removal process. Electronic components on the second circuit board 30. In order to achieve the above object, further, the material of the insulating part may be silicone gel. In this solution, the material of the insulating part enables the insulating part wrapping the second circuit board 30 to be removed when the second circuit board 30 needs to be repaired, so as to facilitate the repair of the second circuit board 30 .

The insulating part may be introduced into the first recessed part 51 before the first connecting part 70 is connected to the first housing 50 , or may be introduced into the first recessed part 51 after the first connecting part 70 is connected to the first housing 50 . When the insulating part is introduced after the first connecting part 70 is connected to the first housing 50, see FIGS. 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 container. The cavities 76 are connected. In this solution, after the first connecting portion 70 is connected to the first housing 50 and the first connecting portion 70 and the first recess 51 jointly define the accommodating cavity 76, the first opening 71 can be used to inject insulation into the accommodating cavity 76. department. 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 used to inject the insulating part, and will not be described again here.

When the first opening 71 is provided on the first connecting part 70 , after the insulating part is injected into the accommodation cavity 76 through the first opening 71 , the insulating part overflowing from the first opening 71 can be used to seal the first opening 71 . Blocking pieces can be added. In one embodiment, the first connecting portion 70 is provided with a second recess 72 facing the wall surface of the second housing 60 , and the second recess 72 is provided with the aforementioned first opening 71 facing the bottom wall of the second housing 60 . A sinking platform is provided on the wall of the first connecting portion 70 away from the accommodation cavity 76 , and the aforementioned first opening 71 is opened on the bottom wall of the sinking platform. On the one hand, if the first opening 71 is sealed by the insulating portion overflowing the first opening 71 , the insulating portion overflowing the first opening 71 will fill the second concave portion 72 , thereby improving the sealing performance. On the other hand, if a blocking piece is used to cover the first opening 71 to seal the first opening 71 , the blocking piece is positioned in the second recess 72 , and the blocking piece is not easily separated from the second opening 75 , and the sealing effect is better. good.

In order to improve the structural strength of the first connecting part 70, in one embodiment, the first connecting part 70 includes an inner wall facing the accommodation cavity 76, and the inner wall is provided with ribs 73, and the ribs 73 enclose a plurality of grids. slot 74. The provision of the ribs 73 can make the first connecting portion 70 have higher structural strength. The rib plate 73 is provided with a second opening 75 , and the second opening 75 leads to each grid groove 74 . In this way, during the process in which the insulating part is introduced from the first opening 71 into the accommodation cavity 76 defined by the first recess 51 and the first connecting part 70, when the insulating part is filled into each grid groove 74, each grid will The air in the slots 74 can communicate with each other through the second opening 75 , thereby filling each grid slot 74 . In some embodiments, the second opening 75 extends to the inner wall surface of the first connecting part 70 facing the accommodating cavity 76 in a direction perpendicular to the inner wall surface of the first connecting part 70 facing the accommodating cavity 76 . In this solution, the gas conductivity of each grid groove 74 can be further improved, and the amount of the insulating portion injected into the accommodation cavity 76 can be increased.

In one embodiment, the second circuit board 30 and the battery core group 10 are arranged along the third direction Z, and the first housing 50 has a first wall 53 and an eighth wall 53a arranged opposite to each other along the third direction Z. The two circuit boards 30 are 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 to each other. The second wall 54 and the third wall 55 are located on both sides of the first wall 53 respectively. The second wall 54 The first electronic device 41 is disposed on the side of the battery pack 10 . The first wall surface 53 is provided with the aforementioned first recessed portion 51 , and the first recessed portion 51 extends to the junction of the third wall surface 55 and the first wall surface 53 . Viewed along the third direction Z, the first recess 51 extends to the third wall surface 55 . The extension of the second recess 72 to the junction of the first wall 53 and the third wall 55 can maximize the layout length of the second wire harness 92 in the first recess 51 and effectively improve the protection effect of the second wire harness 92 .

In one embodiment, the first recess 51 may be arranged on the first wall 53 . In another embodiment, the first recess 51 may be arranged on multiple wall surfaces of the first housing 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 part 511 communicates with the second part 512 , and the second wire harness 92 extends from the first part 511 to the second part 512 in the first recess 51 . The first recess 51 is arranged on at least two wall surfaces of the first housing 50 (the two wall surfaces are the first wall surface 53 and the second wall surface 54 respectively). In this solution, the extension direction of the second wire harness 92 can be matched to accommodate the second wire harness 92 in the accommodating cavity 76 to the maximum extent, further improving the protection effect of the second wire harness 92 . This reduces the risk of the second wire harness 92 becoming loose and desoldered due to vibration of the battery module 1 during use.

When the first recess 51 is distributed on multiple wall surfaces of the first housing 50 , the first recess 51 can be closed by a single component (ie, the aforementioned first connecting portion 70 ) to form the accommodation cavity 76 , or it can be closed by multiple components. A receiving cavity 76 is formed. In one embodiment, the first connecting part 70 may 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 part 70 closes the first part 511 of the first recessed part 51 , and the fourth part of the first connecting part 70 closes the second part 512 of the first recessed part 51 . That is, the first recessed portion 51 is closed by the first connecting portion 70 to form the accommodating cavity 76 . In another embodiment, the first recess 51 may be closed by two parts of the first connecting part 70 and the second connecting part to form the accommodating cavity 76 . In one embodiment, the first recess 51 closes the first part 511 of the first recess 51, and the first housing 50 is also connected to a second connecting part, and the second connection part is used to close the second part 512 of the first recess 51 (No. The two connecting parts may completely close the second part 512 of the first recess 51 or close part of the first recess 51). That is, the first recessed portion 51 is closed by the first connecting portion 70 and the second connecting portion to form the accommodating cavity 76 . In one embodiment, the second part 512 is integrally connected with the first housing 50 . In other embodiments, the second connection part may also be detachably connected to the first housing 50 .

Referring to Figures 22-25, in one embodiment, along the first direction between 10 battery packs. The fourth wall surface 56 is provided on the third end side 13 side of the battery core group 10 , and the fifth wall surface 57 is provided on the fourth end side 14 side of the battery core group 10 . Along the first direction That is, the second portion 512 of the first recess 51 is closer to the fourth wall 56 than the fifth wall 57 . In this way, after the second wire 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 surface 56 and the battery pack 10. After the second wire harness 92 extends out of the second recess 72, it can be closer to the first circuit board 20, so it is more convenient to connect to the first circuit board 20. The circuit board 20 is electrically connected.

When the battery module 1 has multiple external electronic devices, all of the above electronic devices may be electrically connected to the second circuit board 30 and thus indirectly electrically connected to the first circuit board 20 , or some of the electronic devices may be electrically connected to the first circuit board 20 . The second circuit board 30 is electrically connected, and another part of the electronic equipment is electrically connected to the second circuit board 30 and thus indirectly electrically connected to the first circuit board 20 . In one embodiment, the battery module 1 has a plurality of external electronic devices, and each electronic device is electrically connected to the second circuit board 30 and thereby indirectly electrically connected to the first circuit board 20 .

In some embodiments, the second circuit board 30 may also include electronic components for charge and discharge management of the battery. In this way, the second circuit board 30 can share some functions of the first circuit board 20. For example, the second circuit board 30 can also be provided with electronic components for overcharge protection, electronic components for over-discharge protection, and electronic components for charging over-current protection. Components, electronic components for discharge overcurrent protection, electronic components for short circuit protection, electronic components for temperature protection or electronic components for equalizing voltage, etc. The specific functions of the electronic components provided on the second circuit board 30 depend on the specific situation. All the electronic components for the above-mentioned certain functions may be provided on the second circuit board 30 , or part of the electronic components for the above-mentioned certain functions may be provided, and the remaining electronic components for realizing the functions 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, and the processing cost and processing difficulty of the first circuit board 20 can be reduced. At the same time, the volume of the first circuit board 20 can be reduced. take up space.

Referring to FIGS. 36-40 , in order to facilitate the wire harnesses in the accommodating cavity 76 defined by the first recess 51 and the first connecting part 70 to be led out of the accommodating cavity 76 and to facilitate the assembly of each wire harness, a connector 80 is provided. Specifically, the above-mentioned accommodation cavity 76 communicates with the outside world (outside the accommodation cavity 76 ) through the third opening 58 . The third opening 58 may be provided on the first connecting part 70; the third opening 58 may be provided on the first housing 50; part of the third opening 58 may also be provided on the first connecting part 70, and the other part may be provided on the first connecting part 70. on the housing 50 (that is, the first housing 50 and the first connecting portion 70 jointly define the third opening 58). For convenience of description, in the following embodiments, the first housing 50 is provided with the third opening 58 as an example.

The connector 80 can be used to fix the first wire harness 91, and can also be used to fix the second wire harness 92 or other wire harnesses. Specifically, in one embodiment, the connector 80 is mainly used to fix the second wire harness 92 . For ease of description, in the following embodiments, the connector 80 is used to fix the second wire harness 92 as an example.

The connecting piece 80 is detachably connected to the first housing 50 , and specifically it can be a snap connection, a magnetic connection, an interference connection, etc. The connecting piece 80 covers the third opening 58. The connecting piece 80 has a wire hole 813. The wire hole 813 is connected with the accommodation cavity 76. The second wire harness 92 is passed through the wire hole 813, so that the second wire harness 92 can be easily accommodated. The inside of the cavity 76 is led out to the outside of the accommodation cavity 76 and is electrically connected to the first circuit board 20 .

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

In one embodiment, by adding the connector 80 , during the assembly process of the second wire harness 92 , the second wire harness 92 is passed through the connector 80 , and when the second wire harness 92 is connected with the first circuit board 20 and the second circuit board 30 After all are electrically connected, the connecting member 80 is pushed to move relative to the second wire harness 92 to connect with the first housing 50 , thereby achieving the purpose of the second wire harness 92 passing out of the accommodating cavity 76 .

During the above assembly process, after the second wire harness 92 is electrically connected to the first circuit board 20 and the second circuit board 30 respectively, the connector 80 is moved once relative to the second wire harness 92 to complete the assembly of the second wire harness 92. Compared with With the previous solution, the operator does not need to repeatedly pull the second wire harness 92 to adjust the position of the second wire harness 92 relative to the first circuit board 20 and the second circuit board 30 , making the assembly process of the second wire harness 92 more convenient and convenient. Since the connector 80 in one embodiment is detachably connected to the first housing 50, it is also very convenient to disassemble the wire harness, which improves the maintenance efficiency.

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

In one embodiment, the first latching member 82 includes two opposite hooks 821 , the second latching member 59 includes an annular flange extending toward the third opening 58 , and the two latching members 821 . The hook 821 is clamped on the inner annular wall of the annular flange, and the connecting block 81 is against the outer annular wall of the annular flange. The above-mentioned "connecting block 81 abuts the outer annular wall of the annular flange" means that the connecting block 81 can directly contact the outer annular wall and thereby abut against the outer annular wall. The connecting block 81 can also indirectly abut against the outer annular wall through an intermediate component. Outer annular wall. Whether the connecting block 81 is in direct contact with the outer annular wall depends on actual requirements.

During the assembly of the connector 80 to the first housing 50 , the two hooks 821 pass through the third opening 58 on the first housing 50 , and the two hooks 821 pass through the third opening 58 and then abut against the annular ring. The inner annular surface of the flange limits the movement of the connecting member 80 in the direction away from the accommodating cavity 76 , while 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 ), restricting the connecting member 80 Moved into the accommodating cavity 76 , that is, the above structural arrangement makes the connecting member 80 more firmly fixed on the first housing 50 .

Referring to FIGS. 38-41 , in one embodiment, the connecting member 80 may further include a buffer member 83 . One side of the buffer member 83 is attached to the sixth wall surface 811, and the other side is attached to the outer annular wall surface of the annular flange (in the state after the connecting member 80 is installed 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 generating deformation in a direction perpendicular to the sixth wall 811 . The buffer member 83 has elasticity and can deform in a direction perpendicular to the sixth wall surface 811 . When the hook 821 extends into the third opening 58 and contacts the inner annular wall of the annular flange, the buffer member 83 is squeezed by the annular flange and is compressed. The pressure in the cavity 76 and the pressure given to the connecting block 81 in a direction away from the accommodating cavity 76 enable the connecting block 81 to indirectly abut the outer annular wall. The buffer member 83 can also offset the processing error of the first connecting member 80 through the amount of elastic deformation. When the actual distance between the hook 821 and the connecting block 81 is slightly larger than the designed distance, the above-mentioned processing error of the hook 821 can be offset by reducing the deformation amount of the buffer member 83 . When the actual distance between the hook 821 and the connecting block 81 is slightly larger than the designed distance, the above-mentioned processing error of the hook 821 can be offset by increasing the deformation amount of the buffer member 83 .

At the same time, the buffer member 83 can also improve the sealing effect between the connecting block 81 and the first housing 50 , thereby easing the connection between the accommodating cavity 76 and the space outside the accommodating cavity 76 through the gap between the outer annular wall surface and the connecting block 81 Similar issues.

In one embodiment, the buffer member 83 is annular, and the buffer member 83 is arranged around the outside 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, thereby saving the material used for the buffer member 83 and reducing material costs.

The connector 80 can be fixedly connected or movably connected with the second wire harness 92 . When the two are movablely connected, the two can be connected by interference, so that the wire hole 813 can be interference-fitted with the wire passing through. When the connecting member 80 is fixedly connected to the second wire harness 92, the connecting member 80 may be glued to the wire. That is, adhesive glue is used to fix the relative positions of the two.

When the connector 80 and the second wire harness 92 are bonded by glue, in one embodiment, the connector 80 includes a reinforcement 814 arranged around the wire hole 813 , the reinforcement 814 defines a slot 815 , and the slot 815 can be Used to hold adhesive glue. When the adhesive glue is poured into the groove body 815, the adhesive glue can be used to fix the relative positions of the second wire harness 92 and the connector 80 on the one hand, and can also seal the wire hole 813 on the other hand, thereby improving the capacity. The sealing of cavity 76.

The wire passing hole 813 is a through hole that has two opposite openings, one of which faces the accommodation cavity 76 and the other opening faces away from the accommodation cavity 76 . The reinforcement 814 can be disposed on either side of the two openings. Referring to FIG. 38 , in one embodiment, the connecting block 81 includes a seventh wall 812 opposite to the sixth wall 811 , the wire hole 813 is connected to the seventh wall 812 , and the reinforcement 814 is connected to the seventh wall 812 . In one embodiment, the encircling rib 814 is provided at a position of the wire passage hole 813 facing away from the opening of the accommodating cavity 76 . In this way, the connector 80 can be glued after being assembled with the first housing 50. There is no order restriction on the assembly process and the glue injection process of the connector 80, making the processing more convenient.

The second aspect of the present application also provides an electrical device, which includes the battery module 1 in any of the above embodiments.

It should be noted that the preferred embodiments of the present application are given in the description 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 are not used as additional limitations on the content of the present application, and are provided for the purpose of making the disclosure of the present application more thorough and comprehensive. Furthermore, the above technical features can be continuously combined with each other to form various embodiments not listed above, which are all deemed to be within the scope of the description of this application; further, for those of ordinary skill in the art, they can be improved or transformed according to the above description. , and all these improvements and transformations should fall within the protection scope of the claims appended to this application.

Claims

A battery module is characterized by including:

A battery pack, the battery pack including at least one battery cell;

A first circuit board, the first circuit board is used for charge and discharge management of the battery module, the first circuit board and the battery core group are arranged along the first direction;

a second circuit board, the second circuit board is separated from the first circuit board;

A first electronic device, the first electronic device and the battery core group are arranged along a second direction, and the second direction is perpendicular to the first direction;

A first wire harness, the first wire harness is electrically connected to both the first electronic device and the second circuit board;

A second wire harness, the second wire harness is electrically connected to both the first circuit board and the second circuit board.
The battery module according to claim 1, characterized in that:

The second circuit board and the battery core group are arranged along the first direction, or along a third direction that is perpendicular to both the first direction and the second direction.
The battery module according to claim 2, characterized in that:

Along the second direction, the battery core group has a first end side and a second end side opposite to each other;

Along the second direction, the first electronic device is disposed on the first end side of the battery core group.
The battery module according to claim 3, characterized in that:

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

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, L1>L2.
The battery module according to claim 5, characterized in that:

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

The second circuit board and the battery core 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, L3<L4.
The battery module according to claim 7, characterized in that:

Along the second direction, the second circuit board has first side portions and second side portions distributed 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 wire harness is connected to the first electrical connection part, and the distance between the first electrical connection part and the first side part is S1, and the distance between the first electrical connection part and the second side part is S1. The distance between the edges is S2;

Along the second direction, the second wire harness is connected to the second electrical connection part, and the distance between the second electrical connection part and the first side part is S3, and the distance between the second electrical connection part and the second side part is S3. The distance between the edges is S4;

Among them, S1<S2; and/or S4<S3.
The battery module according to claim 8, characterized in that:

The battery module also includes a second electronic device and a third wire harness. The second electronic device is separated from the first electronic device. One end of the third wire harness is electrically connected to the second electronic device and the other end is electrically connected to the second electronic device. electrically connected to the second circuit board;

The second electronic device is disposed on one side of the first end of the battery pack.
The battery module according to claim 9, characterized in that:

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

Viewed along the second direction, along the first direction, the second electronic device is positioned away from the second circuit board.
The battery module according to claim 9, characterized in that:

The second circuit board also includes a third electrical connection part, the third wire harness is welded to the third electrical connection part, and the closest distance between the third electrical connection part and the first side part is S5, The shortest distance to the second side is S6, S5<S6.
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 for charging and discharging the battery pack.
The battery module according to claim 13, characterized in that:

Along the first direction, the second electronic device is disposed on a side of the first electronic device away from the first circuit board.
The battery module according to claim 12, characterized in that:

The second circuit board further includes a fourth electrical connection part, and the battery module further includes a fourth wire harness, one end of the fourth wire harness is welded to the fourth electrical connection part, and the other end extends to the second end edge;

The fourth electrical connection part is electrically connected to the third electrical connection part.
The battery module according to claim 15, characterized in that:

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

The shortest distance between the fourth electrical connection part and the first side part is S7, and the shortest distance between the fourth electrical connection part and the second side part is S8, S7>S8.
The battery module according to claim 2, characterized in that,

The second circuit board and the battery core group are arranged along the third direction;

Along the first direction, the size of the second circuit board is H1, and the size of the battery core group is H2, H1<H2.
The battery module according to claim 2, characterized in that,

The second circuit board and the battery core group are arranged along the third direction;

Viewed along the third direction, the second circuit board is located in the battery core group.
The battery module according to claim 2, characterized in that,

The first wire harness and the second circuit board are detachably connected or welded.
The battery module according to claim 20, wherein the battery module further includes:

The first shell is set outside the battery core group;

a second housing set outside the first housing;

Wherein, the first circuit board is provided in the first housing.
The battery module according to claim 21, characterized in that:

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

The second circuit board is connected to the first housing.
The battery module according to claim 21, characterized in that:

A first recess is provided on the wall of the first housing facing the second housing, and the second circuit board is disposed in the first recess.
The battery module according to claim 24, characterized in that:

There is also a first connection part between the first shell and the second shell, the first connection part is connected to the first shell, the first connection part and the first recessed part Together they define an accommodating cavity, and the second circuit board is disposed in the accommodating cavity.
The battery module according to claim 25, characterized in that,

The first connection part 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 part is made of transparent material.
The battery module according to claim 25, characterized in that,

The battery module also includes an insulating part that wraps the second circuit board.
The battery module according to claim 27, characterized in that:

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

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

The first connecting part is provided with a first opening, and the first opening is connected with the accommodation cavity.
The battery module according to claim 30, characterized in that:

The first connecting portion is provided with a second recess facing the wall surface of the second housing, and the second recess is provided with the first opening facing the bottom wall of the second housing.
The battery module according to claim 25, characterized in that,

The first connection part includes an inner wall facing the accommodation cavity, the inner wall is provided with ribs, the ribs enclose a plurality of grid grooves, and the ribs are provided with a second opening. The second opening conducts each of the grid grooves.
The battery module according to claim 32, characterized in that:

Along the direction perpendicular to the inner wall surface, the second opening extends to the inner wall surface.
The battery module according to claim 24, characterized in that:

A protruding portion is provided on the wall surface of the first housing facing the second housing, and the protruding portion encloses the first recessed portion.
The battery module according to claim 24, characterized in that:

The second circuit board and the battery core group are arranged along the third direction, the first housing has a first wall, and the second circuit board is connected to the first wall of the first housing;

Along the second direction, the first housing has a second wall and a third wall arranged opposite to each other, and the second wall and the third wall are respectively located on both sides of the first wall, so The second wall is provided on the side of the battery pack on which the first electronic device is disposed;

The first wall is provided with the first recess, and the first recess extends to the intersection of the third wall and the first wall.
The battery module according to claim 35, characterized in that:

The first recess includes a first part located on the first wall surface and a second part located on the third wall surface, the first part communicates with the second part, and the second wire harness is connected to the first wall surface. The inside of the recess extends from the first part to the second part.
The battery module according to claim 36, characterized in that,

Along the first direction, the first housing has a fourth wall surface and a fifth wall surface distributed opposite to each other, and the first circuit board is provided between the fourth wall surface and the battery core group;

The shortest distance between the second part and the fourth wall is L5, and the shortest distance from the fifth wall is L6, L5<L6.
The battery module according to claim 1, characterized in that:

The second circuit board includes electronic components used for charge and discharge management of the battery.
An electrical device, characterized by comprising the battery module according to any one of claims 1-38.