Battery cell and protection plate assembling structure, lithium battery and electronic equipment

Abstract

The utility model relates to the technical field of lithium batteries, in particular to an assembly structure of a battery cell and a protection plate, a lithium battery and electronic equipment. The assembly structure of the battery cell and the protection plate comprises the battery cell and the protection plate, two tabs of the battery cell are used for being electrically connected with two nickel sheets on the protection plate in a one-to-one correspondence manner, and the two tabs are cut before being connected with the corresponding nickel sheets, so that the width of each tab is accurately controlled to be equal to that of the corresponding nickel sheet; meanwhile, the position of each tab is accurately controlled, so that each tab can be connected with the corresponding nickel sheet in a manner of facing to each other, the connection is ensured not to deviate, and the process yield is improved; meanwhile, the nickel sheets do not need to reserve assembly allowance in the width direction, and are as wide as the corresponding tabs, so that the space occupied by the nickel sheets on the protection plate is effectively reduced, the length of the protection plate can be reduced to a certain extent, the cost of the protection plate is reduced, the width of the battery can be reduced, and the service life of the battery is prolonged. And the space occupied by the battery in the electronic equipment is reduced.

Description

Technical Field

[0001] This application relates to the field of lithium battery technology, and in particular to an assembly structure for a cell and a protection board, a lithium battery, and an electronic device. Background Technology

[0002] When assembling and connecting lithium battery cells and protection boards, the positive electrode tab of the cell needs to be electrically connected to the positive nickel plate on the protection board, and the negative electrode tab of the cell needs to be electrically connected to the negative nickel plate on the protection board. Currently, the width of the nickel plate on the protection board is usually greater than the width of the tab, so that both tabs can be effectively and stably connected to the corresponding nickel plate, but this sacrifices a significant amount of the protection board length. Utility Model Content

[0003] The purpose of this invention is to provide an assembly structure for a battery cell and a protection board, a lithium battery, and an electronic device, so as to shorten the length of the protection board to a certain extent.

[0004] The first aspect of this utility model provides an assembly structure for a battery cell and a protection board, including a battery cell and a protection board;

[0005] The protective plate is provided with positive and negative nickel plates at intervals;

[0006] One end of the battery cell is provided with a positive electrode tab and a negative electrode tab at intervals. The positive electrode tab is cut to control the position and width of the positive electrode tab so that the positive electrode tab is the same width as the positive electrode nickel sheet and is connected directly opposite each other.

[0007] The negative electrode tab is cut to control its position and width, so that the negative electrode tab is the same width as the negative nickel sheet and is connected directly opposite it.

[0008] Furthermore, one surface of the battery cell in the width direction is a reference surface;

[0009] The width of the positive electrode tab facing the reference surface that is cut off is D1, so that the distance between the positive electrode tab facing the reference surface and the reference surface after the cut-off side is A;

[0010] D1 satisfies: 0.5mm≤D1≤1.2mm.

[0011] Furthermore, the width of the positive electrode tab cut off on the side away from the reference plane is D2, so that the width of the positive electrode tab is controlled to be C1;

[0012] D2 satisfies: 0.5mm≤D2≤1.2mm.

[0013] Furthermore, the width of the side of the negative electrode tab facing the reference surface that is cut off is D3, so that the distance between the side of the negative electrode tab facing the reference surface after cutting and the reference surface is B;

[0014] D3 satisfies: 0.5mm≤D3≤1.2mm.

[0015] Furthermore, the width of the negative electrode tab cut off on the side away from the reference plane is D4, so that the width of the negative electrode tab is controlled to be C2.

[0016] D4 satisfies: 0.5mm≤D3≤1.2mm.

[0017] Furthermore, the width of the positive electrode nickel sheet is C1, and the distance between the side of the positive electrode nickel sheet facing the reference surface and the reference surface is A;

[0018] One end of the positive electrode nickel sheet is welded to the protective plate, and the other end of the positive electrode nickel sheet is bent to be parallel and attached to the positive electrode tab, and then welded to the positive electrode tab.

[0019] Furthermore, the width of the negative electrode nickel sheet is C2, and the distance between the side of the negative electrode nickel sheet facing the reference surface and the reference surface is B;

[0020] One end of the negative electrode nickel sheet is welded to the protective plate, and the other end of the negative electrode nickel sheet is bent to be parallel and attached to the negative electrode tab, and then welded to the negative electrode tab.

[0021] The second aspect of this utility model provides a lithium battery, including the assembly structure of the cell and protection board described in any of the above claims.

[0022] The third aspect of this utility model provides an electronic device, including the lithium battery described above.

[0023] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0024] The assembly structure of the battery cell and protection board provided by this utility model includes a battery cell and a protection board. One end of the battery cell is provided with two tabs, namely a positive tab and a negative tab, which are arranged side by side and spaced apart along the width direction of the battery cell. The protection board is arranged opposite to the end of the battery cell with tabs. On the side of the protection board facing the battery cell, there are two nickel plates, namely a positive nickel plate and a negative nickel plate, which are arranged side by side and spaced apart along the length direction of the protection board, which is also the width direction of the battery cell. The positive nickel plate is used to electrically connect with the positive tab of the battery cell, and the negative nickel plate is used to electrically connect with the negative tab of the battery cell.

[0025] The two tabs and two nickel plates each have a predetermined width in the width direction of the battery cell. The two tabs of the battery cell are cut before being connected to the corresponding nickel plates to precisely control the width of each tab so that each tab is the same width as the corresponding nickel plate. At the same time, the position of each tab is precisely controlled in the width direction of the battery cell so that each tab can be connected to the corresponding nickel plate directly opposite each other.

[0026] Therefore, with the assembly structure of the battery cell and protection board of this application, the nickel sheet on the protection board does not need to reserve assembly allowance in the width direction, and the nickel sheet can be made to be the same width as the corresponding tab; thereby, while reducing the misalignment of the tab and nickel sheet connection and improving the process yield, it can also effectively reduce the space occupied by the nickel sheet on the protection board, so that the length of the protection board can be reduced to a certain extent and the cost of the protection board can be reduced. At the same time, it can also reduce the width of the battery and reduce the space occupied by the battery in the electronic device.

[0027] This utility model also provides a lithium battery and an electronic device including the lithium battery. The lithium battery includes the assembly structure of the cell and the protection board. Therefore, the lithium battery and the electronic device also have the beneficial effects of the assembly structure of the cell and the protection board. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 A schematic diagram of the assembly structure of the battery cell and protection board provided in an embodiment of this utility model;

[0030] Figure 2 A schematic diagram of the battery cell in the assembly structure of the battery cell and protection board provided in the embodiment of this utility model.

[0031] Figure label:

[0032] 1-Battery cell, 2-Protection board, 3-Positive electrode tab, 4-Negative electrode tab, 5-Positive nickel plate, 6-Negative nickel plate. Detailed Implementation

[0033] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0034] The components of the present invention embodiments described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0035] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0036] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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 utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] The following reference Figure 1 and Figure 2 This application describes the assembly structure of the battery cell and protection board, the lithium battery, and the electronic device according to some embodiments.

[0039] The first aspect of this application provides an assembly structure for a battery cell and a protection board.

[0040] like Figure 1 and Figure 2As shown, the assembly structure of the battery cell and protection board provided in this application includes a battery cell 1 and a protection board 2. One end of the battery cell 1 is provided with two tabs, namely a positive tab 3 and a negative tab 4, and the positive tab 3 and the negative tab 4 are arranged side by side with intervals along the width direction of the battery cell 1. The protection board 2 is arranged opposite to the end of the battery cell 1 that is provided with tabs. On the side of the protection board 2 facing the battery cell 1, there are two nickel plates, namely a positive nickel plate 5 and a negative nickel plate 6. The positive nickel plate 5 and the negative nickel plate 6 are arranged side by side with intervals along the length direction of the protection board 2, which is also the width direction of the battery cell 1. The positive nickel plate 5 is used to electrically connect with the positive tab 3 of the battery cell 1, and the negative nickel plate 6 is used to electrically connect with the negative tab 4 of the battery cell 1.

[0041] The two tabs and two nickel sheets in the cell 1 each have a predetermined width in the width direction. The two tabs of the cell 1 are cut before being connected to the corresponding nickel sheets to precisely control the width of each tab, so that each tab is the same width as the corresponding nickel sheet. At the same time, the position of each tab in the width direction of the cell 1 is precisely controlled so that each tab can be directly connected to the corresponding nickel sheet. Here, both the tabs and the nickel sheets are sheet-like structures. Directly connecting the tabs and the nickel sheets means that one surface of the tab in the thickness direction is directly attached to one surface of the nickel sheet in the thickness direction.

[0042] Therefore, through the assembly structure of the battery cell and protection board of this application, the nickel sheet on the protection board 2 does not need to reserve assembly allowance in the width direction, and the nickel sheet can be made to be the same width as the corresponding tab; thereby, while reducing the misalignment of the tab and the nickel sheet connection and improving the process yield, it can also effectively reduce the space occupied by the nickel sheet on the protection board 2, so that the length of the protection board 2 can be reduced to a certain extent, and the cost of the protection board 2 can be reduced. At the same time, the width of the battery can also be reduced, and the space occupied by the battery in the electronic device can be reduced.

[0043] In this embodiment, preferably, taking one side surface of the cell 1 in the width direction as the reference plane, when controlling the position and width of the positive electrode tab 3, firstly, the side of the positive electrode tab 3 facing the reference plane is precisely cut, and the distance between the side of the cut positive electrode tab 3 facing the reference plane and the reference plane is controlled as distance A. Then, the side of the positive electrode tab 3 away from the reference plane is precisely cut, and the width of the positive electrode tab 3 after both sides are cut is controlled as C1.

[0044] When controlling the position and width of the negative electrode tab 4, firstly, the side of the negative electrode tab 4 facing the reference plane is precisely cut, and the distance between the side of the negative electrode tab 4 facing the reference plane and the reference plane after cutting is controlled as B. Then, the side of the negative electrode tab 4 away from the reference plane is precisely cut, and the width of the negative electrode tab 4 after both sides are cut is controlled as C2.

[0045] Correspondingly, the width of the positive nickel sheet 5 on the protection board 2 is C1, and the width of the negative nickel sheet 6 is C2. The distance between the positive nickel sheet 5 and the negative nickel sheet 6 is equal to the distance between the positive electrode tab 3 and the negative electrode tab 4. That is, the distance between the side of the positive nickel sheet 5 facing the reference plane and the reference plane is also A, and the distance between the side of the negative nickel sheet 6 facing the reference plane and the reference plane is also B. Therefore, when connecting the battery cell 1 and the protection board 2, the positive electrode tab 3 and the positive nickel sheet 5 can be connected together with equal width and facing each other, and the negative electrode tab 4 and the negative nickel sheet 6 can be connected together with equal width and facing each other. This can avoid connection misalignment to a certain extent and improve the process yield.

[0046] In this embodiment, preferably, both the positive electrode tab 3 and the negative electrode tab 4 have an initial feed width, and the positive electrode tab 3 and the negative electrode tab 4 are cut respectively based on this width.

[0047] Specifically, the width cut off on the side of the positive electrode tab 3 facing the reference plane is D1, so that the distance between the side of the positive electrode tab 3 facing the reference plane and the reference plane is controlled as A; the width cut off on the side of the positive electrode tab 3 away from the reference plane is D2, so that the final width of the positive electrode tab 3 after cutting is controlled as C1.

[0048] The width cut off on the side of the negative electrode tab 4 facing the reference plane is D3, so that the distance between the side of the negative electrode tab 4 facing the reference plane and the reference plane is controlled as B; the width cut off on the side of the negative electrode tab 4 away from the reference plane is D4, so that the final width of the negative electrode tab 4 after cutting is controlled as C2.

[0049] Preferably, D1, D2, D3 and D4 are all greater than or equal to 0.5mm and less than or equal to 1.2mm; the specific value is determined according to the position tolerance of the actual battery cell tab 1.

[0050] In the traditional assembly scheme of battery cell 1 and protection board 2, the width of the nickel sheet on the protection board 2 is larger than the initial incoming width of the corresponding tab. The difference in width between the nickel sheet and the corresponding tab on one side is more than 0.5mm. However, with the assembly scheme of this application, by precisely cutting the tab to control the position and width of the tab, the nickel sheet and the corresponding tab can be connected with equal width assembly, thereby effectively reducing the width of each nickel sheet on the protection board 2, so as to reduce the length of the protection board 2, and the length of the protection board 2 can be reduced by at least 2mm to 4.8mm.

[0051] In this embodiment, preferably, both the positive electrode nickel sheet 5 and the negative electrode nickel sheet 6 are L-shaped, such that one end of the two nickel sheets is opposite to the surface of the protective plate 2 and is welded to the protective plate 2, and the other end of the two nickel sheets is bent to face the corresponding electrode sheet and is welded to it.

[0052] The second aspect of this application provides a lithium battery, including the assembly structure of the cell and protection board of any of the above embodiments. Therefore, the lithium battery has all the beneficial effects of the assembly structure of the cell and protection board, which will not be described in detail here.

[0053] The third aspect of this application provides an electronic device including the lithium battery of any of the above embodiments. Therefore, the electronic device also has all the beneficial effects of the assembly structure of the battery cell and the protection board, which will not be described in detail here.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An assembly structure for a battery cell and a protection board, characterized in that, The protection plate is arranged between the positive and negative electrode nickel sheets and the positive and negative electrode tabs. The protection plate is arranged between the positive and negative electrode nickel sheets and the positive and negative electrode tabs. The positive electrode tab is cut to control the position and width of the positive electrode tab, so that the positive electrode tab is parallel to and connected to the positive electrode nickel sheet. The negative electrode tab is cut to control the position and width of the negative electrode tab, so that the negative electrode tab is parallel to and connected to the negative electrode nickel sheet.

2. The assembly structure of the battery cell and the protection plate according to claim 1, wherein The side surface of the battery in the width direction is a reference surface. The width of the side of the positive electrode tab facing the reference surface is D1, and the distance between the side of the positive electrode tab facing the reference surface and the reference surface is A. D1 satisfies 0.5mm≤D1≤1.2mm.

3. The assembly of claim 2, wherein: The width of the side of the positive electrode tab away from the reference surface is D2, and the width of the positive electrode tab is controlled to C1. D2 satisfies 0.5mm≤D2≤1.2mm.

4. The assembly of claim 2, wherein the protection plate is made of a material having a higher thermal conductivity than the material of the cell. The width of the side of the negative electrode tab facing the reference surface is D3, and the distance between the side of the negative electrode tab facing the reference surface and the reference surface is B. D3 satisfies 0.5mm≤D3≤1.2mm.

5. The assembly of claim 4, wherein: The width of the side of the negative electrode tab away from the reference surface is D4, and the width of the negative electrode tab is controlled to C2. D4 satisfies 0.5mm≤D3≤1.2mm.

6. The assembly of claim 3, wherein the protection plate is made of a material having a thermal conductivity of 0.5 W / mK or more. The width of the positive electrode nickel sheet is C1, and the distance between the side of the positive electrode nickel sheet facing the reference surface and the reference surface is A. One end of the positive electrode nickel sheet is welded to the protection plate, and the other end of the positive electrode nickel sheet is bent to be parallel to and connected to the positive electrode tab.

7. The assembly of claim 5, wherein the protection plate is made of a material having a thickness of 0.1 mm or less. The width of the negative electrode nickel sheet is C2, and the distance between the side of the negative electrode nickel sheet facing the reference surface and the reference surface is B. One end of the negative electrode nickel sheet is welded to the protection plate, and the other end of the negative electrode nickel sheet is bent to be parallel to and connected to the negative electrode tab.

8. A lithium battery, characterized by The assembly structure of the battery and the protection plate.

9. An electronic device, comprising: The lithium battery.

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