Battery module and electric equipment

Abstract

The utility model relates to the technical field of batteries, and discloses a battery module and electric equipment. The battery module comprises a battery cell assembly, a circuit board and a first conductive piece, the battery cell assembly comprises a plurality of battery cells, each battery cell comprises a main body part, and a first polarity terminal and a second polarity terminal which extend out of the main body part, the first polarity terminal of one battery cell is used as a first polarity part of the battery cell assembly, and the second polarity terminal of the other battery cell is used as a second polarity part of the battery cell assembly; the cell assembly and the circuit board are arranged at an interval along a first direction, and the circuit board is provided with a first opening; the first conductive piece comprises a first connecting part and a first welding part, the first connecting part is connected to the circuit board, at least part of the first welding part is located in the first opening, and the first polarity part is welded to the first welding part. The first welding part of the first conductive part is closer to the battery cell assembly, so that the polarity terminals in the battery cell assembly can be connected in series, and the battery cell assembly can be connected with the circuit board.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery module and electrical equipment. Background Technology

[0002] A battery module is a device that can store and release electrical energy. To increase the capacity of a battery module, individual battery cells are usually connected in series to form a total positive and negative terminal. The total positive and negative terminals of the series-connected battery cells are then soldered to a circuit board via busbars.

[0003] However, in existing battery modules, the circuit board is located above the battery cell, and the overlap area between the battery cell's tab and the copper busbar differs, increasing the difficulty of soldering. Utility Model Content

[0004] The main technical problem addressed by the embodiments of this application is to provide a battery module and electrical equipment that can help solve the aforementioned welding difficulties.

[0005] To solve the above-mentioned technical problems, one technical solution adopted in this application embodiment is: providing a battery module, including a cell assembly, a circuit board, and a first conductive element. The cell assembly includes multiple cells, each cell including a main body and a first polarity terminal and a second polarity terminal extending from the main body. The first polarity terminal of one cell serves as the first polarity portion of the cell assembly, and the second polarity terminal of another cell serves as the second polarity portion of the cell assembly. One of the first polarity terminal and the second polarity terminal is a positive terminal, and the other is a negative terminal. The cell assembly and the circuit board are spaced apart along a first direction, and the circuit board has a first opening. The first conductive element includes a first connecting portion and a first welding portion. The first connecting portion is connected to the circuit board, at least a portion of the first welding portion is located within the first opening, and the first polarity portion is welded to the first welding portion.

[0006] In one or more embodiments, the first weld portion includes a first surface that contacts and connects with the first polar portion, and the first weld portion and the first polar portion are stacked and connected along a first direction; the first surface is located within a first opening.

[0007] In one or more embodiments, the first conductive element includes a first lap portion connected to the first weld portion, wherein the first lap portion and the first connecting portion are arranged on opposite sides or adjacent sides on the first weld portion.

[0008] In one or more embodiments, a plurality of battery cells are stacked along a second direction, and the first polarity terminal and the second polarity terminal of each battery cell are located on the same side of the main body. The battery cell includes a housing. Along a first direction, the length of the first polarity terminal outside the housing is equal to the length of the second polarity terminal outside the housing, wherein the first direction and the second direction are perpendicular.

[0009] In one or more embodiments, viewed in a direction opposite to the first direction, the main body includes a first wall and a second wall located on both sides of the first polarity terminal. In the second direction, the length D1 of the first wall and the length D2 of the second wall satisfy the condition: D1 > D2. The first walls of two adjacent cells are arranged adjacently, and the second walls of two adjacent cells are arranged adjacently. The battery module includes a buffer member disposed between two adjacent second walls.

[0010] In one or more embodiments, along the second direction, the battery cell assembly includes a first battery cell located on the outermost side, and a first polarity terminal of the first battery cell serving as a first polarity portion of the battery cell assembly; along the first direction, a first welding portion is located above a first wall of the first battery cell.

[0011] In one or more embodiments, the first polar part has a first part and a second part, the two ends of the first part are respectively connected to the second part and the housing of the first battery cell, the first part is bent along a first direction, the first part is located above the second wall of the first battery cell, and the second part is welded to the first welding part.

[0012] In one or more embodiments, along the second direction, the cell assembly includes a second cell located on the outermost side, and along the second direction, the first cell and the second cell are respectively located at both ends of the cell assembly, and the second polarity terminal of the second cell serves as the second polarity portion of the cell assembly; the circuit board is provided with a second opening; the battery module includes a second conductive element, the second conductive element includes a second connecting portion and a second welding portion, the second connecting portion is connected to the circuit board, at least a portion of the second welding portion is located within the second opening, and the second welding portion and the second polarity portion are welded together.

[0013] In one or more embodiments, the battery module includes a sampling component, which includes a third connecting portion and a third welding portion. The third connecting portion is disposed on a circuit board. Along a first direction, the third welding portion is located between the circuit board and the main body. A first polarity terminal of one battery cell and a second polarity terminal of another adjacent battery cell are stacked and welded to the third welding portion.

[0014] To solve the above-mentioned technical problems, another technical solution adopted in the embodiments of this application is to provide an electrical device, including a battery module.

[0015] The beneficial effects of this application embodiment are as follows: The battery module of this application embodiment includes a cell assembly, a circuit board, and a first conductive component. The cell assembly includes multiple cells, each cell including a main body and a first polarity terminal and a second polarity terminal extending from the main body. The first polarity terminal of one cell serves as the first polarity portion of the cell assembly, and the second polarity terminal of another cell serves as the second polarity portion of the cell assembly. The cell assembly and the circuit board are spaced apart along a first direction, and the circuit board has a first opening. The first conductive component includes a first connecting portion and a first welding portion. The first connecting portion is connected to the circuit board, and at least a portion of the first welding portion is located within the first opening. The first polarity portion is welded to the first welding portion. In this application, the first welding portion of the first conductive component is closer to the cell assembly, which facilitates the series connection of the polarity terminals inside the cell assembly and facilitates the connection between the cell assembly and the circuit board. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the specific embodiments of this application, the accompanying drawings used in the description of the specific embodiments will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0017] Figure 1 This is a schematic diagram of the battery module according to an embodiment of this application.

[0018] Figure 2 This is an exploded view of the battery module in an embodiment of this application.

[0019] Figure 3 yes Figure 1 A magnified view of part A in the middle.

[0020] Figure 4 yes Figure 5 A magnified view of part B in the middle.

[0021] Figure 5 This is a schematic diagram of the battery module from another perspective in an embodiment of this application.

[0022] Figure 6 This is a schematic diagram of the battery cells in the battery module of this application before assembly.

[0023] Figure 7 This is a schematic diagram of the battery cell in the battery module of this application embodiment from another perspective.

[0024] Figure 8 yes Figure 5 A magnified view of part C in the middle. Detailed Implementation

[0025] To facilitate understanding of this application, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as "connected" to another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "upper," "lower," "inner," "outer," "vertical," "horizontal," etc., used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0027] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0028] Please see Figure 1 and Figure 2 The battery module 100 of this application embodiment includes a cell assembly 10, a circuit board 20, and a first conductive element 30. The cell assembly 10 is electrically connected to the circuit board 20 through the first conductive element 30. The cell assembly 10 has a plurality of cells 11, each cell 11 including a main body portion 111 and a first polarity terminal 112 and a second polarity terminal 113 extending from the main body portion 111, wherein one of the first polarity terminal 112 and the second polarity terminal 113 is a positive terminal and the other is a negative terminal. The first polarity terminal 112 of one of the plurality of cells 11 (the first cell 12 mentioned below) serves as the first polarity portion 121 of the cell assembly 10, and the second polarity terminal 113 of another cell 11 (the second cell 13 mentioned below) serves as the second polarity portion 131 of the cell assembly 10.

[0029] The battery cell assembly 10 and the circuit board 20 are spaced apart along a first direction X, and the circuit board 20 has a first opening 21. The first conductive element 30 includes a first connecting portion 31 and a first soldering portion 32. The first connecting portion 31 is connected to the circuit board 20, for example, by soldering. At least a portion of the first soldering portion 32 is located within the first opening 21, and a first polarity portion 121 is soldered to the first soldering portion 32.

[0030] The battery module 100 of this application opens a first opening 21 on the circuit board 20 and at least a portion of the first welding part 32 of the first conductive member 30 is disposed in the first opening 21. This allows the first conductive member 30 to sink partially and the at least portion of the first welding part 32 to be closer to the cell assembly 10, thereby facilitating the welding of the first polar part 121 on the cell assembly 10 to the first welding part 32 and reducing the difficulty of processing and assembly.

[0031] Please refer to the following: Figure 3 and Figure 4 The first welding portion 32 includes a first surface 321, which is the surface of the first welding portion 32 away from the cell assembly 10 along the first direction X. The first welding portion 32 and the first polarity portion 121 are stacked and connected along the first direction X, and the first surface 321 is located within the first opening 21. The first polarity portion 121 is contacted and connected to the first surface 321 of the first welding portion 32. The side of the circuit board 20 away from the cell assembly 10 has more space to accommodate a welding device for welding the first polarity portion 121 to the first welding portion 32.

[0032] In some embodiments, the first surface 321 being located within the first opening 21 can be understood as: along Figure 4 Viewed from the perspective shown, along the first direction X, the first surface 321 of the first solder part 32 is located between the two opposing surfaces 20a and 20b of the circuit board 20.

[0033] In some embodiments, please refer to Figure 3 The first conductive element 30 includes a first overlapping portion 33 connected to the first welding portion 32. The first overlapping portion 33 and the first connecting portion 31 are arranged on opposite sides or adjacent sides of the first welding portion 32. Specifically, the projection of the first welding portion 32 along the first direction X is approximately rectangular or square. The first overlapping portion 33 and the first connecting portion 31 are arranged on opposite sides or adjacent sides of the first welding portion 32. This allows the first conductive element 30 to form two opposite or lateral connection points with the circuit board 20. Compared to a structure where only the first connecting portion 31 forms a single connection point, the structure with two connection points makes the first conductive element 30 more stably connected to the circuit board 20.

[0034] In some embodiments, the first connecting portion 31 is welded to the circuit board 20, and the first connecting portion 31 can conduct electricity, thereby enabling the battery cell assembly 10 and the circuit board 20 to be electrically connected through the first connecting portion 31 of the first conductive member 30. The main function of the first overlapping portion 33 is to provide support. Therefore, the first overlapping portion 33 can be fixedly connected to the circuit board 20 by overlapping, snapping, bonding, screwing, or welding. In this case, the first overlapping portion 33 is not electrically connected to the circuit board 20. In other embodiments, the first overlapping portion 33 can simultaneously provide support and conduction. The first overlapping portion 33 can be fixedly connected to the circuit board 20 by overlapping, snapping, bonding, screwing, or welding. In this case, the first overlapping portion 33 is electrically connected to the circuit board 20. This reduces the current on the first connecting portion 31, thereby reducing the heat generated by the first connecting portion 31 and reducing current loss.

[0035] In some embodiments, please refer to Figure 2 and Figure 6 The battery cell assembly 10 includes a plurality of battery cells 11 stacked along a second direction Y. Each battery cell 11 includes a main body portion 111 and a first polarity terminal 112 and a second polarity terminal 113 extending from the same side of the main body portion 111, wherein the first direction X and the second direction Y are perpendicular. The first polarity terminal 112 and the second polarity terminal 113 have opposite polarities, one of which constitutes the positive electrode of the battery cell 11, and the other constitutes the negative electrode of the battery cell 11. The battery cell 11 includes a housing 110.

[0036] Please see Figure 6 Before assembly, the length L1 of the first polarity terminal 112 extending along the first direction X is equal to the length L2 of the second polarity terminal 113 extending. This structure is beneficial for assembling several battery cells 11.

[0037] In some embodiments, please refer to Figure 7 Viewing the cell 11 in a direction opposite to the first direction X, the main body 111 includes a first wall 114 and a second wall 115 located on both sides of the first polarity terminal 112. Along the second direction Y, the length D1 of the first wall 114 and the length D2 of the second wall 115 satisfy the condition: D1 > D2. Please refer to [further details needed]. Figure 4 In the battery cell assembly 10, the first walls 114 of two adjacent battery cells 11 are arranged adjacently, and the second walls 115 of two adjacent battery cells 11 are arranged adjacently. The battery module 100 includes a buffer 40, which is disposed between two adjacent second walls 115.

[0038] The battery cell 11 in this application is a pouch cell, meaning that the outer casing of the battery cell 11 is formed by stamping aluminum-plastic film. The pouch cell 11 is configured such that the length D1 of the first wall 114 along the second direction Y is greater than the length D2 of the second wall 115, which allows the pouch cell 11 to have better performance. Therefore, multiple battery cells 11 with the above structure are stacked in the second direction Y. The connection of the first polarity terminal 112 and the second polarity terminal 113 between two adjacent battery cells 11 allows multiple battery cells 11 to be connected in series, thereby increasing the capacity of the battery module 100.

[0039] The length D1 of the first wall 114 of the battery cell 11 is greater than the length D2 of the second wall 115. After multiple battery cells 11 are stacked, the first width K1 of the polarity terminals of two adjacent battery cells 11 in the second direction Y is greater than the second width K2, while the protruding length of the first polarity terminal 112 and the protruding length of the second polarity terminal 113 are the same. A buffer 40 is disposed between the second walls 115 of two adjacent battery cells 11 to appropriately increase the second width K2, so as to facilitate the connection of the first polarity terminals 112 and the second polarity terminals 113 of two adjacent battery cells 11. As some examples, the buffer 40 may be foam, etc.

[0040] In some embodiments, please refer to Figure 4 Along the second direction Y, the outermost cell 11 of the cell assembly 10 is the first cell 12. The first polarity terminal 112 of the first cell 12 serves as the first polarity part 121 of the cell assembly 10. The second polarity terminal 113 of the first cell 12 is connected to the first polarity terminal 112 of the adjacent cell 11 (the next outermost cell 11).

[0041] Along the first direction X, the first welding part 32 is located above the first wall 114 of the first cell 12. With the above-mentioned structural arrangement, on the one hand, it is convenient to weld the first conductive part 30 to the first polar part 121, reducing the need to extend the length of the first polar part 121 or add adapters, thus reducing the assembly difficulty. On the other hand, it can reduce the length of the circuit board 20 protruding from the cell assembly 10 in the second direction Y, thereby reducing the size of the battery module 100 in the second direction Y.

[0042] In some embodiments, please refer to Figure 4The first polarity portion 121 has a first portion 1211 and a second portion 1212. The two ends of the first portion 1211 are respectively connected to the second portion 1212 and the housing 110 of the first battery cell 12. The first portion 1211 is bent in a first direction X and is located on the second wall 115 of the first battery cell 12. The second portion 1212 extends approximately in a second direction Y and is welded to a first welding portion 32. The first welding portion 32 is located above the first battery cell 12. The first portion 1211 of the first polarity portion 121 is inclined to facilitate welding of the first polarity portion 121 to the first welding portion 32.

[0043] In some embodiments, please refer to Figure 2 Along the second direction Y, the cell assembly 10 includes a second cell 13 located on the outermost side. The second cell 13 and the first cell 12 are located at the two ends of the cell assembly 10 along the second direction Y, and a plurality of cells 11 are stacked between the first cell 12 and the second cell 13. One of the second polarity terminals 113 in the second cell 13 serves as the second polarity portion 131 of the cell assembly 10. The second polarity portion 131 and the first polarity portion 121 are disposed on both sides of the cell assembly 10 along the second direction Y, which is perpendicular to the first direction X. The first polarity portion 121 is a total current input / output terminal after the plurality of cells 11 are connected in series, and the second polarity portion 131 is another total current input / output terminal after the plurality of cells 11 are connected in series. As an example, the first polarity portion 121 is the total negative terminal of the cell assembly 10, and the second polarity portion 131 is the total positive terminal of the cell assembly 10. The total negative terminal and the total positive terminal need to be electrically connected to the circuit board 20.

[0044] The circuit board 20 is provided with a second opening 22. The battery module 100 includes a second conductive element 50, which includes a second connecting portion 51 and a second welding portion 52. The second connecting portion 51 is connected to the circuit board 20, and at least a portion of the second welding portion 52 is located in the second opening 22. The second polarity portion 131 is welded to the second welding portion 52.

[0045] Please refer to the following: Figure 3 The second welding portion 52 includes a second surface 521, which is the surface of the second welding portion 52 that is away from the cell assembly 10 along the first direction X. The second welding portion 52 and the second polarity portion 131 are stacked together along the first direction X, and the second surface 521 is located within the second opening 22.

[0046] The connection method between the second polarity portion 131 and the circuit board 20 in this application is similar to or the same as the connection method between the first polarity portion 121 and the circuit board 20. Specifically, by opening a first opening 21 on the circuit board 20 and allowing a portion of the first conductive element 30 to sink into the first opening 21, the first polarity portion 121 is welded to the first welding portion 32. Similarly, by opening a second opening 22 on the circuit board 20 and allowing a portion of the second conductive element 50 to sink into the second opening 22, the second polarity portion 131 is welded to the second welding portion 52.

[0047] In some embodiments, the structure of the second conductive element 50 can be similar to that of the first conductive element 30, as detailed in the above embodiments, which will not be repeated here. For example, the second conductive element 50 may also be provided with a second overlapping portion 53, and the second overlapping portion 53 and the second connecting portion 51 are arranged on opposite sides or adjacent sides on the second welding portion 52, thereby enhancing the connection stability between the second conductive element 50 and the circuit board 20.

[0048] In some embodiments, please refer to Figure 2 and Figure 8 The battery module 100 includes a sampling component 60, which includes a third connecting portion 61 and a third welding portion 62 connected to each other. The third connecting portion 61 is disposed on the circuit board 20, and the third welding portion 62 is located between the circuit board 20 and the main body portion 111. The first polarity terminal 112 of one battery cell 11 and the second polarity terminal 113 of another adjacent battery cell 11 are stacked and welded to the third welding portion 62.

[0049] By adding a structure to the sampling component 60, on the one hand, the sampling component 60 can serve as a welding carrier for the first polarity terminal 112 and the second polarity terminal 113 of two adjacent battery cells 11, thereby enhancing the welding strength between the first polarity terminal 112 and the second polarity terminal 113; on the other hand, the sampling component 60 can form an electrical connection with the circuit board 20, thereby enabling the detection components on the circuit board 20 to monitor the current and voltage of the battery cell assembly 10 in real time.

[0050] This application also provides an embodiment of an electrical device, which includes a battery module 100. The battery module 100 is used to provide electrical energy to the electrical device so that the device can operate normally. For the specific structure and function of the battery module 100, please refer to any of the above embodiments, and will not be repeated here.

[0051] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A battery module, characterized in that, include: A battery cell assembly includes multiple battery cells, each battery cell including a main body and a first polarity terminal and a second polarity terminal extending from the main body, wherein the first polarity terminal of one battery cell serves as the first polarity portion of the battery cell assembly, and the second polarity terminal of another battery cell serves as the second polarity portion of the battery cell assembly, wherein one of the first polarity terminal and the second polarity terminal is a positive terminal and the other is a negative terminal; A circuit board, wherein the battery cell assembly and the circuit board are spaced apart along a first direction, and the circuit board has a first opening; The first conductive element includes a first connecting portion and a first welding portion. The first connecting portion is connected to the circuit board, and at least a portion of the first welding portion is located inside the first opening. The first polar portion is welded to the first welding portion.

2. The battery module according to claim 1, characterized in that, The first weld portion includes a first surface that contacts and connects with the first polar portion, and the first weld portion and the first polar portion are stacked and connected along the first direction; The first surface is located within the first opening.

3. The battery module according to claim 1, characterized in that, The first conductive element includes a first lap portion connected to the first weld portion, and the first lap portion and the first connecting portion are arranged on opposite sides or adjacent sides on the first weld portion.

4. The battery module according to any one of claims 1-3, characterized in that, The plurality of battery cells are stacked along a second direction, and the first polarity terminal and the second polarity terminal of each battery cell are located on the same side of the main body. Each battery cell includes a housing. Along the first direction, the length of the first polarity terminal outside the housing is equal to the length of the second polarity terminal outside the housing, wherein the first direction and the second direction are perpendicular.

5. The battery module according to claim 4, characterized in that, Viewed from the direction opposite to the first direction, the main body includes a first wall and a second wall located on both sides of the first polarity terminal. Along the second direction, the length D1 of the first wall and the length D2 of the second wall satisfy: D1 > D2. The first walls of two adjacent battery cells are arranged adjacent to each other, and the second walls of two adjacent battery cells are arranged adjacent to each other; The battery module includes a buffer element disposed between two adjacent second walls.

6. The battery module according to claim 5, characterized in that, Along the second direction, the cell assembly includes a first cell located on the outermost side, and the first polarity terminal of the first cell serves as the first polarity portion of the cell assembly; Along the first direction, the first welded portion is located above the first wall of the first battery cell.

7. The battery module according to claim 6, characterized in that, The first polar part has a first part and a second part. The two ends of the first part are respectively connected to the second part and the housing of the first cell. The first part is bent along the first direction and is located above the second wall of the first cell. The second part is welded to the first welding part.

8. The battery module according to claim 6, characterized in that, Along the second direction, the cell assembly includes a second cell located on the outermost side. Along the second direction, the first cell and the second cell are located at opposite ends of the cell assembly, and the second polarity terminal of the second cell serves as the second polarity portion of the cell assembly. The circuit board has a second opening; The battery module includes a second conductive component, which includes a second connecting portion and a second welding portion. The second connecting portion is connected to the circuit board, and at least a portion of the second welding portion is located within the second opening. The second welding portion and the second polarity portion are welded together.

9. The battery module according to claim 8, characterized in that, The battery module includes a sampling component, which includes a third connecting part and a third welding part, wherein the third connecting part is disposed on the circuit board; Along the first direction, the third welding part is located between the circuit board and the main body, and the first polarity terminal of one battery cell and the second polarity terminal of another adjacent battery cell are stacked and welded to the third welding part.

10. An electrical appliance, characterized in that, Includes the battery module as described in any one of claims 1-9.

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