Battery cell and tab connecting piece thereof

Abstract

The utility model provides a tab connecting piece. The tab connecting piece comprises a supporting part and two side wing welding parts, the supporting part is provided with a first surface and a second surface which are arranged back to back, each side wing welding part is provided with a first surface and a second surface which are arranged back to back, and the first surface of the supporting part and the first surface of each side wing welding part face the same direction; the two sides of the supporting part extend in the direction facing the second face of the supporting part to be provided with stopping parts, each stopping part is connected with one side wing welding part, and the first face of the supporting part and the first face of each side wing welding part are located on different planes. The supporting part extends out of the stopping part, so that a certain tab folding space is formed in the side wing welding part; when the tabs of the two battery cells are respectively and correspondingly welded on the two side wing welding parts, the tabs of the two battery cells are blocked by the blocking parts, so that when the tabs of the battery cells are folded, the situation that the tabs of the two battery cells are directly connected in a naked manner can be effectively prevented, the risk of short circuit is reduced, and the safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery cores, in particular to a battery core and a pole ear connecting sheet thereof. Background Art

[0002] The square battery cells on the market generally use connecting plates as bridges to connect the battery cell tabs and the top cover poles. The connecting plates are generally butterfly-shaped and have a small overall volume, resulting in a small overcurrent cross-section. They are basically conventional battery cells that meet the charging and discharging requirements of 0.5C and below. Under this type of connecting plate structure, if large-capacity battery cells are charged and discharged at 1P or above, the butterfly-shaped connecting plates on the market cannot meet the overcurrent requirements, affecting the safety performance of the battery cells. Moreover, the connecting plates are basically made into flat sheets, and the tabs are welded to the connecting plates. After the connecting plates are welded to the top cover poles, the tabs and the bare battery cells are easily squeezed, and there is a risk of the tabs being inserted inverted into the bare battery cells. Utility Model Content

[0003] Based on this, it is necessary to provide a battery cell and its tab connector to address the above technical issues.

[0004] A tab connecting piece comprises: a supporting portion and two side welding portions; the supporting portion has a first surface and a second surface arranged opposite to each other, each of the side welding portions has a first surface and a second surface arranged opposite to each other, and the first surface of the supporting portion and the first surface of each of the side welding portions face the same direction; stop portions are respectively extended on both sides of the supporting portion in the direction toward which the second surface of the supporting portion faces, each of the stop portions is connected to one of the side welding portions, and the first surface of the supporting portion and the first surface of each of the side welding portions are in different planes.

[0005] In one embodiment, a frosted layer or an embossed layer is disposed on the first surface of the support portion.

[0006] In one embodiment, the thickness of the support portion is equal to the thickness of the two flank welding portions.

[0007] In one embodiment, the tab connecting piece is made of aluminum or copper.

[0008] In one embodiment, the supporting portion, the stopping portion and the two side wing welding portions are integrally formed.

[0009] In one embodiment, the first surface of the supporting portion and the first surfaces of each of the flank welding portions are parallel to each other.

[0010] In one embodiment, a tail wing groove is provided on the supporting portion of the tab connecting piece.

[0011] A battery cell comprises at least two cell bodies and at least two tab connecting sheets as described in any one of the above embodiments, wherein the tab connecting sheets comprise a positive tab and a negative tab, the positive tab of one cell body is welded to the first surface of one of the side wing welding portions of the positive tab, the positive tab of another cell body is welded to the first surface of the other side wing welding portion of the positive tab, the negative tab of one cell body is welded to the first surface of one of the side wing welding portions of the negative tab, and the negative tab of another cell body is welded to the first surface of the other side wing welding portion of the negative tab.

[0012] In one embodiment, a first positioning groove is provided on the support portion of the positive electrode connecting sheet, and a second positioning groove is provided on the support portion of the negative electrode connecting sheet. When the first surface of the positive electrode connecting sheet and the first surface of the negative electrode connecting sheet face the same direction, the position of the first positioning groove on the positive electrode connecting sheet is different from the position of the second positioning groove on the negative electrode connecting sheet.

[0013] In one embodiment, the size and / or shape of the first positioning groove is different from the size and / or shape of the second positioning groove.

[0014] The beneficial effects provided by the utility model are as follows: the support portion of the pole tab connecting piece is used to weld the pole tab connecting piece to the top cover of the battery, and the flank welding portion of the pole tab connecting piece is used to connect the pole tab connecting piece to the pole tab of the battery cell. By extending the stopper portions on both sides of the support portion, a certain amount of folding pole tab space is provided on the first surface of the two flank welding portions; when the pole tabs of the two battery cells are respectively welded on the first surfaces of the two flank welding portions, the pole tabs of the two battery cells will be blocked by the stopper portions, so that when the pole tabs of the battery cells are folded, the situation of the pole tabs of the two battery cells being directly exposed can be effectively prevented, thereby reducing the risk of short circuit and improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the three-dimensional structure of a tab connecting sheet in one direction in an embodiment;

[0016] Figure 2 A schematic diagram of the three-dimensional structure of a battery cell in one direction in an embodiment

[0017] Figure 3 A schematic diagram of the three-dimensional structure of a positive electrode connecting sheet in one direction in one embodiment;

[0018] Figure 4 It is a schematic diagram of the three-dimensional structure of the negative electrode connecting piece in one direction in one embodiment.

[0019] In the accompanying drawings, 100, the ear connecting piece; 110, the supporting part; 120, the side wing welding part; 130, the stopping part; 140, the tail wing groove; 200, the battery cell; 210, the battery cell body; 220, the battery top cover; 300, the positive electrode connecting piece; 310, the first positioning groove; 320, the first tail wing groove; 400, the negative electrode connecting piece; 410, the second positioning groove; 420, the second tail wing groove. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0021] In one embodiment, Figure 1 As shown, a tab connecting piece 100 comprises: a supporting portion 110 and two side welding portions 120; the supporting portion 110 has a first surface and a second surface arranged opposite to each other, each of the side welding portions 120 has a first surface and a second surface arranged opposite to each other, and the first surface of the supporting portion 110 and the first surface of each of the side welding portions 120 face the same direction; stop portions 130 are respectively extended on both sides of the supporting portion 110 in the direction toward which the second surface of the supporting portion 110 faces, each of the stop portions 130 is connected to one of the side welding portions 120, and the first surface of the supporting portion 110 and the first surface of each of the side welding portions 120 are in different planes.

[0022] Specifically, the support portion 110 of the tab connector 100 is used to weld the tab connector 100 to the battery top cover, and the wing welding portion 120 of the tab connector 100 is used to connect the tab connector 100 to the tab of the battery cell. By extending the stopper 130 on both sides of the support portion 110, a certain tab folding space is provided on the first surface of the two wing welding portions 120; when the tabs of two battery cells are respectively welded on the first surfaces of the two wing welding portions 120, the tabs of the two battery cells will be blocked by the two stopper portions 130, so that when the tabs of the battery cell are folded, the tabs of the two battery cells can be effectively prevented from being directly connected, thereby reducing the risk of short circuit and improving safety.

[0023] In order to better weld the support part 110 to the battery top cover, in one embodiment, a frosted layer or an embossed layer is provided on the first surface of the support part 110. Specifically, the frosted layer or the embossed layer can increase the roughness of the first surface of the support part 110. When the support part 110 needs to be welded to the battery top cover, when the first surface of the support part 110 is welded by laser, the reflection of the laser on the first surface of the support part 110 can be reduced, so that the support part 110 of the tab connector 100 can be better welded to the battery top cover.

[0024] In order to allow the tab connecting sheet 100 to conduct electricity and current better, in one embodiment, Figure 1 As shown, the thickness of the support portion 110 is equal to the thickness of the two wing welding portions 120. Specifically, since the thickness of the support portion 110 of the tab connecting piece 100 is equal to the thickness of the two wing welding portions 120, the resistance of each part of the tab connecting piece 100 is equal, so that the tab connecting piece 100 can be better energized and conducted.

[0025] In one embodiment, the material of the tab connecting piece 100 is aluminum or copper. Specifically, aluminum and copper both have good electrical conductivity and strong ductility; therefore, aluminum or copper can be more easily processed into the tab connecting piece 100.

[0026] In order to make the tab connecting sheet 100 have a certain structural strength, in one embodiment, Figure 1 As shown, the support portion 110, the stopper portion 130 and the two wing welding portions 120 are integrally formed. Specifically, the tab connector 100 is integrally stamped or integrally machined. The tab connector 100 integrally formed in the above manner has a certain structural strength and good electrical conductivity.

[0027] In one embodiment, Figure 1 As shown, the first surface of the support portion 110 and the first surface of each of the wing welding portions 120 are parallel to each other. Specifically, the first surface of the support portion 110 and the first surfaces of the two wing welding portions 120 are arranged parallel to each other, and one end of each of the stopper portions 130 is vertically arranged on the second surface of the support portion 110, and the other end of each of the stopper portions 130 is vertically arranged on the first surface of a stopper portion 130. Through the above arrangement, the two stopper portions 130 can better block the tabs of the two battery cells, thereby preventing the tabs of the two battery cells from being directly connected bare.

[0028] In order to maximize the flow cross section between the support portion 110 and the wing welding portion 120 of the tab connecting piece 100, in one embodiment, Figure 1As shown, a tail wing groove 140 is provided on the support portion 110 of the tab connecting piece 100. Specifically, by providing the tail wing groove 140 on the support portion 110, the cross-sectional area of ​​the support portion 110 can be increased, so that the flow cross section between the support portion 110 of the tab connecting piece 100 and the wing welding portion 120 can be maximized, thereby better allowing the tab connecting piece 100 to conduct electricity.

[0029] In one embodiment, Figure 2 As shown, a battery cell 200 includes at least two cell bodies 210, and at least two tab connecting sheets 100 described in any one of the above embodiments, wherein the tab connecting sheets 100 include a positive electrode connecting sheet 300 and a negative electrode connecting sheet 400, the positive electrode tab of one of the cell bodies 210 is welded to the first surface of one of the side wing welding portions 120 of the positive electrode connecting sheet 300, the positive electrode tab of another of the cell bodies 210 is welded to the first surface of the other side wing welding portion 120 of the positive electrode connecting sheet 300, the negative electrode tab of one of the cell bodies 210 is welded to the first surface of one of the side wing welding portions 120 of the negative electrode connecting sheet 400, and the negative electrode tab of another of the cell bodies 210 is welded to the first surface of the other side wing welding portion 120 of the negative electrode connecting sheet 400. Specifically, the positive electrode tabs of the two cell bodies 210 are connected through a positive electrode connecting sheet 300; that is, the positive electrode tab of one cell body 210 is welded to the first surface of the wing welding portion 120 on one side of the positive electrode connecting sheet 300; the positive electrode tab of the other cell body 210 is welded to the first surface of the wing welding portion 120 on the other side of the positive electrode connecting sheet 300. The negative electrode tabs of the two cell bodies 210 are connected through a negative electrode connecting sheet 400; that is, the negative electrode tab of one cell body 210 is welded to the first surface of the wing welding portion 120 on one side of the negative electrode connecting sheet 400; the negative electrode tab of the other cell body 210 is welded to the first surface of the wing welding portion 120 on the other side of the negative electrode connecting sheet 400.

[0030] In one embodiment, Figure 2 As shown, the battery cell 200 further includes a battery top cover 220 . The second surface of the support portion 110 of the positive electrode connecting piece 300 is welded to the battery top cover 220 , and the second surface of the support portion 110 of the negative electrode connecting piece 400 is welded to the battery top cover 220 .

[0031] In order to prevent the positive electrode connecting sheet 300 and the negative electrode connecting sheet 400 from being misaligned during installation, in one embodiment, Figure 2 , Figure 3 and Figure 4As shown, a first positioning groove 310 is provided on the support portion 110 of the positive electrode connecting sheet 300, and a second positioning groove 410 is provided on the support portion 110 of the negative electrode connecting sheet 400. When the first surface of the positive electrode connecting sheet 300 and the first surface of the negative electrode connecting sheet 400 face the same direction, the position of the first positioning groove 310 on the positive electrode connecting sheet 300 is different from the position of the second positioning groove 410 on the negative electrode connecting sheet 400. Specifically, through the above-mentioned first positioning groove 310 and the second positioning groove 410, it is only necessary to set the corresponding first positioning column and the second positioning column on the battery top cover 220, and install the second side of the positive connecting piece 300 toward the battery top cover 220. At this time, the first positioning column can only be inserted in the first positioning groove 310; install the second side of the negative connecting piece 400 toward the battery top cover 220. At this time, the second positioning column can only be inserted in the second positioning groove 410, so as to prevent the positive connecting piece 300 and the negative connecting piece 400 from being installed misaligned.

[0032] In order to further prevent the positive electrode connecting sheet 300 and the negative electrode connecting sheet 400 from being misaligned during installation, in one embodiment, Figure 3 and Figure 4 As shown, the size and / or shape of the first positioning groove 310 is different from the size and / or shape of the second positioning groove 410. Specifically, by setting the size and / or shape of the first positioning groove 310 to be different from the size and / or shape of the second positioning groove 410, the first positioning groove 310 on the positive electrode connecting piece 300 cannot be placed on the first positioning column on the battery top cover 220, and the second positioning groove 410 on the negative electrode connecting piece 400 cannot be placed on the second positioning column on the battery top cover 220, so that the positive electrode connecting piece 300 and the negative electrode connecting piece 400 can be further prevented from being misplaced during installation.

[0033] In order to maximize the flow cross section between the support portion 110 and the wing welding portion 120 of the positive electrode connecting sheet 300, in one embodiment, Figure 3 As shown, a first tail wing groove 320 is provided on the support portion 110 of the positive electrode connecting sheet 300. Specifically, the cross section of the first tail wing groove 320 on the positive electrode connecting sheet 300 is "V"-shaped. By providing the "V"-shaped first tail wing groove 320 on the support portion 110 of the positive electrode connecting sheet 300, the flow cross section between the support portion 110 of the positive electrode connecting sheet 300 and the wing welding portion 120 can be maximized, thereby better allowing the positive electrode connecting sheet 300 to conduct electricity.

[0034] In order to maximize the flow cross section between the support portion 110 and the flank welding portion 120 of the negative electrode connecting sheet 400, in one embodiment, Figure 4 As shown, a second tail wing groove 420 is provided on the support portion 110 of the negative electrode connecting sheet 400. Specifically, the cross section of the second tail wing groove 420 on the negative electrode connecting sheet 400 is trapezoidal. By providing the second trapezoidal tail wing groove 420 on the support portion 110 of the negative electrode connecting sheet 400, the flow cross section between the support portion 110 of the negative electrode connecting sheet 400 and the wing welding portion 120 can be maximized, thereby better allowing the negative electrode connecting sheet 400 to conduct electricity.

[0035] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0036] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A tab connecting piece, characterized in that: include: A support portion and two side wing welding portions; The support portion has a first surface and a second surface disposed opposite to each other, each of the flank welding portions has a first surface and a second surface disposed opposite to each other, and the first surface of the support portion and the first surface of each of the flank welding portions face the same direction; Stopping parts are respectively extended on both sides of the support part in the direction toward which the second surface of the support part faces, each of the stopping parts is connected to one of the flank welding parts, and the first surface of the support part and the first surface of each of the flank welding parts are in different planes.

2. The tab connector according to claim 1, characterized in that: A frosted layer or an embossed layer is disposed on the first surface of the support portion.

3. The tab connector according to claim 1, characterized in that: The thickness of the support portion is equal to the thickness of the two flank welding portions.

4. The tab connector according to claim 1, characterized in that: The material of the tab connecting piece is aluminum or copper.

5. The tab connector according to claim 1, characterized in that: The supporting portion, the stopping portion and the two flank welding portions are integrally formed.

6. The tab connector according to claim 1, characterized in that: The first surface of the supporting portion and the first surfaces of each of the flank welding portions are parallel to each other.

7. The tab connector according to claim 1, characterized in that: A tail wing groove is provided on the supporting portion of the pole tab connecting piece.

8. A battery cell, comprising at least two battery cell bodies, characterized in that: It comprises at least two tab connecting sheets as described in any one of claims 1 to 7, wherein the tab connecting sheets comprise a positive tab and a negative tab, the positive tab of one of the battery cell bodies is welded to the first side of one of the side wing welding parts of the positive tab, the positive tab of the other of the battery cell bodies is welded to the first side of the other of the side wing welding parts of the positive tab, the negative tab of one of the battery cell bodies is welded to the first side of one of the side wing welding parts of the negative tab, and the negative tab of the other of the battery cell bodies is welded to the first side of the other of the side wing welding parts of the negative tab.

9. The battery cell according to claim 8, characterized in that: A first positioning groove is provided on the support portion of the positive electrode connecting sheet, and a second positioning groove is provided on the support portion of the negative electrode connecting sheet. When the first surface of the positive electrode connecting sheet and the first surface of the negative electrode connecting sheet face the same direction, the position of the first positioning groove on the positive electrode connecting sheet is different from the position of the second positioning groove on the negative electrode connecting sheet.

10. The battery cell according to claim 9, characterized in that: The size and / or shape of the first positioning groove is different from the size and / or shape of the second positioning groove.

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