Battery cell assembly, battery pack with battery cell assembly and electric equipment with battery cell assembly

Abstract

The utility model discloses a battery cell assembly, a battery pack with the same and electric equipment. The battery cell assembly comprises a battery cell, a tab and a fixing piece, the battery cell comprises a plurality of laminated pole pieces, and each pole piece comprises a composite current collector and an active coating; the tab comprises a tab body and a plurality of second connecting parts located at the end part of the tab body, the plurality of second connecting parts are spaced along the thickness direction of the tab body, and each first connecting part is inserted between two adjacent second connecting parts; the fixing pieces are used for fixedly connecting the multiple first connecting parts with the multiple second connecting parts. The plurality of pole pieces and the plurality of pole lugs are arranged, and the first connecting part of the composite current collector on each pole piece is inserted between the two adjacent second connecting parts in the pole piece, so that the two sides of each first connecting part are attached to the second connecting parts; and the plurality of first connecting parts and the plurality of second connecting parts are fixedly connected by utilizing the fixing pieces, so that the stability of electric connection between the pole piece and the pole lug is ensured.

Description

Technical Field

[0001] The utility model relates to the field of battery technology, in particular to a battery core assembly and a battery pack and an electric device having the same Background Art

[0002] In the prior art, during the production process of a battery cell containing a composite current collector, the composite current collector needs to be welded multiple times. During the welding process, not only is the procedure complicated and the operation difficult, but poor welding such as cold welding, weld cracks, and weld breaks are also prone to occur. At the same time, the welding of the composite current collector requires special welding equipment and the welding cost is relatively high. In addition, when the composite current collector is welded, the dust generated by the welding is easy to enter the interior of the battery cell and affect the interior of the battery cell. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a battery core assembly with a simple structure, convenient assembly, reliable connection and low production cost.

[0004] According to the battery cell assembly of the embodiment of the utility model, it includes: a battery cell, a pole ear and a fixing member; the battery cell unit includes a plurality of stacked pole pieces, each pole piece includes a composite current collector and an active coating, the composite current collector includes a current collector body and a first connecting portion located at one end of the current collector body, and the active coating is located on both sides of the current collector body; the pole ear includes a pole ear body and a plurality of second connecting portions located at the end of the pole ear body, the plurality of second connecting portions are spaced apart along the thickness direction of the pole ear body, and each first connecting portion is inserted between two adjacent second connecting portions; the fixing member is used to fix the plurality of first connecting portions and the plurality of second connecting portions together.

[0005] According to the battery cell assembly of the embodiment of the utility model, a plurality of pole pieces and a plurality of pole ears are provided, and the first connection part of the composite current collector on each pole piece is inserted between two adjacent second connection parts in the pole ear to ensure that both sides of each first connection part are in contact with the second connection part, and at the same time, a plurality of first connection parts and a plurality of second connection parts are fixedly connected by fixing parts to ensure the stability of the electrical connection between the pole piece and the pole ear. Such an assembly method not only simplifies the assembly structure, reduces the difficulty of assembly, improves the assembly efficiency, and reduces the production cost, but also has a stable and reliable connection and is not prone to poor contact.

[0006] In addition, the battery cell assembly according to the utility model may also have the following additional technical features:

[0007] In some embodiments, a plurality of second connection portions and a plurality of first connection portions are staggered in a thickness direction of the tab body.

[0008] In some embodiments, each of the first connecting parts is provided with a first through hole, each of the second connecting parts is provided with a second through hole opposite to the first through hole, and the fixing member passes through the first through hole and the second through hole to fix the plurality of the first connecting parts with the plurality of the second connecting parts.

[0009] In some embodiments, the fixing member is a rivet.

[0010] In some embodiments, the fixing member is made of metal or insulating material.

[0011] In some embodiments, the fixing element is solid, hollow or semi-hollow.

[0012] In some embodiments, each of the second connecting portions has an equal thickness.

[0013] In some embodiments, the first through hole and the second through hole are both made by punching process.

[0014] The utility model also provides a battery pack having the above embodiment;

[0015] According to the battery pack of the embodiment of the utility model, by providing the battery cell assembly of the above embodiment, the production cost of the battery pack can be reduced and the overall quality of the battery pack can be improved.

[0016] The utility model also provides an electrical device having the above embodiment;

[0017] According to the electric equipment of the embodiment of the utility model, by providing the battery pack of the above embodiment, the reliability of the electric equipment during operation can be effectively improved.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a cross-sectional view of a battery cell assembly according to an embodiment of the utility model, in which only a portion of the first connecting portion and the second connecting portion are shown;

[0020] Figure 2 is a cross-sectional view of a pole ear of a battery cell assembly according to an embodiment of the utility model, in which only a part of the second connecting portion is shown;

[0021] Figure 3 is a top view of a tab of a battery cell assembly according to an embodiment of the utility model;

[0022] Figure 4 is a cross-sectional view of a battery cell of a battery cell assembly according to an embodiment of the utility model, in which only a part of the first connecting portion is shown;

[0023] Figure 5 is a top view of a pole piece of a battery cell assembly according to an embodiment of the utility model;

[0024] Figure 6 is a top view of a composite current collector of a battery cell assembly according to an embodiment of the utility model;

[0025] Figure 7 It is a cross-sectional view of a pole piece of a battery cell assembly according to an embodiment of the utility model.

[0026] Reference numerals:

[0027] 100. Battery cell assembly;

[0028] 1. Cell monomer; 11. Pole piece; 111. Composite current collector; 112. Active coating; 1111. Current collector body; 1112. First connecting portion; 11121. First through hole;

[0029] 2. pole ear; 21. pole ear body; 22. second connecting portion; 221. second through hole;

[0030] 3. Fixing parts. DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Reference below Figure 1-Figure 7 A battery cell assembly 100 according to an embodiment of the present invention is described.

[0036] like Figures 1 to 7 As shown, according to the embodiment of the utility model, the battery cell assembly 100 includes: a battery cell 1, a pole piece 2 and a fixing member 3; the battery cell 1 includes a plurality of stacked pole pieces 11, each pole piece 11 includes a composite current collector 111 and an active coating 112, the composite current collector 111 includes a current collector body 1111 and a first connecting portion 1112 located at one end of the current collector body 1111 (only part of the first connecting portion 1112 is shown in the figure), the active coating 112 is located on both sides of the current collector body 1111, and the active coating 112 can enhance the conductivity and conductivity stability of the composite current collector 111; the pole piece 2 includes a pole piece body 21 and a plurality of second connecting portions 22 located at the end of the pole piece body 21 (only part of the second connecting portions 22 is shown in the figure), the plurality of second connecting portions 22 are spaced apart along the thickness direction of the pole piece body 21, and each first connecting portion 1112 is inserted between two adjacent second connecting portions 22; the fixing member 3 is used to fix the plurality of first connecting portions 1112 and the plurality of second connecting portions 22.

[0037] In this embodiment, the battery cell 1 is electrically connected to the pole tab 2 through the pole piece 11, so that the battery cell 1 outputs current toward the pole tab 2, or an external power source charges the battery cell 1 through the pole tab 2; a plurality of pole pieces 11 are arranged on the battery cell 1, and the plurality of pole pieces 11 are stacked, and the composite current collector 111 in each pole piece 11 has a first connection portion 1112 extending toward the pole tab 2, and the two sides of the extended first connection portion 1112 do not have an active coating 112 to facilitate electrical connection with the pole tab 2; a plurality of second connection portions 22 on the pole tab 2 are spaced apart in the thickness direction of the pole tab body 21, and the space between adjacent second connection portions 22 is 1 / 4 of the pole tab body 21. There is an installation gap. When the pole piece 11 and the pole lug 2 are assembled, each protruding first connecting portion 1112 is inserted into the installation gap so that both sides of the first connecting portion 1112 are fitted with the second connecting portion 22, thereby ensuring the electrical connection between the pole piece 11 and the pole lug 2; a fixing member 3 is used to fix and connect multiple first connecting portions 1112 and multiple second connecting portions 22 that are inserted into each other, so that the multiple first connecting portions 1112 and the multiple second connecting portions 22 are tightly fitted under the fixing action of the fixing member 3, thereby ensuring the stability of the electrical connection between the pole piece 11 and the pole lug 2, and avoiding poor contact or disconnection between the pole piece 11 and the pole lug 2.

[0038] In some embodiments, the number of multiple second connection portions 22 in the pole lug 2 can be adjusted according to the number of extended first connection portions 1112, that is, the pole lug 2 having multiple second connection portions 22 spaced apart along the thickness direction of the pole lug body 21 can be suitable for battery cells 1 with different numbers of pole pieces 11, that is, the pole lug 2 having multiple second connection portions 22 spaced apart along the thickness direction of the pole lug body 21 can be suitable for battery cells 1 with different thicknesses.

[0039] According to the battery cell assembly 100 of the embodiment of the utility model, a plurality of pole pieces 11 and a plurality of pole ears 2 are provided, and the first connection portion 1112 of the composite current collector 111 on each pole piece 11 is inserted between two adjacent second connection portions 22 in the pole ear 2 to ensure that both sides of each first connection portion 1112 are in contact with the second connection portion 22. At the same time, the plurality of first connection portions 1112 and the plurality of second connection portions 22 are fixedly connected by a fixing member 3 to ensure the stability of the electrical connection between the pole piece 11 and the pole ear 2. Such an assembly method not only simplifies the assembly structure, reduces the difficulty of assembly, improves the assembly efficiency, and reduces the production cost, but also provides a stable and reliable connection, and is less likely to cause poor contact.

[0040] In one embodiment of the present invention, Figures 1 to 7As shown, multiple second connection parts 22 and multiple first connection parts 1112 are staggered in the thickness direction of the pole ear body 21. Such an arrangement can make the fit between the first connection part 1112 and the second connection part 22 tighter, and can ensure that both sides of each first connection part 1112 can fit with the second connection part 22, and then fixedly connected by the fixing member 3, thereby significantly enhancing the connection tightness between the first connection part 1112 and the second connection part 22, and further ensuring the stability and reliability of the electrical connection between the pole piece 11 and the pole ear 2.

[0041] In one embodiment of the present invention, Figures 1 to 7 As shown, each first connection portion 1112 is provided with a first through hole 11121, each second connection portion 22 is provided with a second through hole 221 opposite to the first through hole 11121, and the fixing member 3 passes through the first through hole 11121 and the second through hole 221 to fix the plurality of first connection portions 1112 with the plurality of second connection portions 22. Figure 1 As shown, each first connection portion 1112 is provided with a first through hole 11121, and all the first through holes 11121 are concentrically arranged, and each second connection portion 22 is provided with a second through hole 221, and all the second through holes 221 are concentrically arranged. When the multiple first connection portions 1112 and the multiple second connection portions 22 are staggered in the thickness direction of the pole ear body 21, the multiple first through holes 11121 and the multiple second through holes 221 are concentrically arranged in the thickness direction of the pole ear body 21, so as to ensure that in the thickness direction of the pole ear body 21, the multiple first through holes 11121 and the multiple second through holes 221 can form an installation channel that passes through the multiple first connection portions 1112 and the multiple second connection portions 22, so that the fixing member 3 can pass through the installation channel to fix the multiple first connection portions 1112 and the multiple second connection portions 22. In this way, the assembly difficulty of the pole piece 11 and the pole ear 2 can be reduced, the assembly efficiency can be improved, and the reliability of the assembly can be ensured.

[0042] In some embodiments, the first through hole 11121 and the second through hole 221 are both made by punching; the first connecting parts 1112 and the second connecting parts 22 can be interlaced and plugged together first, and then the first through hole 11121 and the second through hole 221 are opened by punching, so that the concentricity of the first through holes 11121 and the second through holes 221 can be ensured, and the assembly accuracy can be effectively improved. In addition, the first through hole 11121 and the second through hole 221 can also be made by other processes, which are not specifically limited here.

[0043] In some embodiments, the fixing member 3 is a rivet, which can provide a fastening force to the multiple first connection parts 1112 and the multiple second connection parts 22 so that the multiple first connection parts 1112 and the multiple second connection parts 22 can fit tightly together, thereby ensuring the stability of the electrical connection between the multiple first connection parts 1112 and the multiple second connection parts 22 and avoiding the occurrence of poor contact.

[0044] In some embodiments, the fixing member 3 is made of metal or insulating material; since the fixing member 3 is mainly used to ensure a tight fit between the first connection part 1112 and the second connection part 22, enhance the clamping force between the first connection part 1112 and the second connection part 22, and ensure the reliability of the electrical connection, the fixing member 3 can be made of metal or insulating material, and the material of the fixing member 3 can be adjusted according to actual needs.

[0045] In some embodiments, the fixing member 3 is solid, hollow or semi-hollow.

[0046] In some embodiments, the thickness of each second connection portion 22 is equal. In this way, the width of the installation gaps between adjacent second connection portions 22 can be ensured to be the same, preventing the installation gaps from being of different widths. This not only improves assembly efficiency and reduces assembly difficulty, but also ensures the installation accuracy between the first connection portion 1112 and the second connection portion 22.

[0047] The utility model also provides a battery pack having the above embodiment;

[0048] According to the battery pack of the embodiment of the present invention, by providing the battery cell assembly 100 of the above embodiment, the production cost of the battery pack can be reduced and the overall quality of the battery pack can be improved.

[0049] The utility model also provides an electrical device having the above embodiment;

[0050] According to the electric equipment of the embodiment of the utility model, by providing the battery pack of the above embodiment, the reliability of the electric equipment during operation can be effectively improved.

[0051] Other structures and operations of the battery cell assembly 100, the battery pack and the electrical equipment according to the embodiment of the utility model are known to ordinary technicians in the field and will not be described in detail here.

[0052] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0053] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery cell assembly, characterized in that: include: A battery cell, wherein the battery cell comprises a plurality of stacked pole pieces, each of which comprises a composite current collector and an active coating, the composite current collector comprises a current collector body and a first connecting portion located at one end of the current collector body, and the active coating is located on both sides of the current collector body; A tab, the tab comprising a tab body and a plurality of second connection portions located at an end of the tab body, the plurality of second connection portions being spaced apart along a thickness direction of the tab body, and each of the first connection portions being inserted between two adjacent second connection portions; A fixing member is used to fix and connect the plurality of first connecting parts and the plurality of second connecting parts.

2. The battery cell assembly according to claim 1, characterized in that: The plurality of second connection portions and the plurality of first connection portions are staggeredly arranged in the thickness direction of the tab body.

3. The battery core assembly according to claim 1, characterized in that: Each of the first connecting parts is provided with a first through hole, each of the second connecting parts is provided with a second through hole opposite to the first through hole, and the fixing member passes through the first through hole and the second through hole to fix the plurality of the first connecting parts with the plurality of the second connecting parts.

4. The battery core assembly according to claim 1, characterized in that: The fixing piece is a rivet.

5. The battery core assembly according to claim 1, characterized in that: The fixing piece is made of metal or insulating material.

6. The battery core assembly according to claim 1, characterized in that: The fixing member is solid, hollow or semi-hollow.

7. The battery cell assembly according to claim 1, characterized in that: The thickness of each of the second connecting parts is equal.

8. The battery cell assembly according to claim 3, characterized in that: The first through hole and the second through hole are both made by punching process.

9. A battery pack, characterized in that: A battery core assembly comprising any one of claims 1 to 8.

10. An electrical device, characterized in that: A battery pack comprising the battery pack of claim 9.

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