Battery cell and battery
By insulating the tabs at the convergence and bending sections, the short circuit problem caused by the internal insertion of the tabs is solved, thus improving the safety performance of lithium batteries.
Patent Information
- Application Number
- CN202422734328.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-11
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2034-11-11
AI Technical Summary
Lithium battery tabs are prone to inward insertion during bending, which can cause short circuits and affect safety performance.
Insulating components, including an insulating layer and an adhesive layer, are installed in the closing and bending sections of the electrode tab. The surface of the insulating layer forms a weak part to assist in supporting the bending of the electrode tab, reduce the degree of deformation, and reduce the risk of internal insertion.
The supporting effect of the insulating components reduces the risk of inserting the tabs into the battery and improves the safety performance of the lithium battery.
Smart Images
Figure CN223598981U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of battery manufacturing, in particular to a battery monomer and a battery. BACKGROUND
[0002] With the rapid development of the new energy industry, the manufacturing process level of lithium batteries is also continuously improved, and higher requirements are put forward for the safety performance of lithium batteries.
[0003] In the manufacturing process of the battery, the tab of the electrode assembly needs to be bent to improve the energy density and space utilization of the battery. Common tab bending processes include U-shaped bending and S-shaped bending, etc. The tab of S-shaped bending is bent twice, which has better safety performance than the tab of U-shaped bending. However, if the tab is inserted during the bending process, a short circuit may occur, leading to a safety accident. UTILITY MODEL CONTENT
[0004] Therefore, the present application provides a battery monomer and a battery, which reduces the risk of tab insertion and has high safety performance.
[0005] The battery monomer of the first aspect embodiment of the present application comprises: a pole; an electrode assembly comprising a main body and a tab, the tab comprising a folding section, a bending section and a connecting section, the folding section being connected with the main body, the connecting section being connected with the pole, and the bending section connecting the folding section and the connecting section, wherein the tab comprises a first side and a second side, the bending section is bent from the folding section to the first side, and the connecting section is bent from the bending section to the second side; and an insulating piece at least partially disposed on the folding section and the bending section on the first side.
[0006] Optionally, the insulating piece comprises an insulating layer and a glue layer, one side of the insulating layer is attached to the glue layer, and the other side surface is recessed to form a weak part, the weak part corresponds to the bending part of the folding section and the bending section, and the two sides of the weak part are a first section and a second section, respectively, the first section is attached to the bending section through the glue layer, and the second section is attached to the folding section through the glue layer.
[0007] Optionally, along the extension direction of the insulating piece, the cross-sectional shape of the weak part is square, trapezoidal or triangular.
[0008] Optionally, the weak part is a hollow structure.
[0009] Optionally, along the extension direction of the insulating piece, the length of the weak part is L, the length of the first section is L1, and the length of the second section is L2, satisfying: 0.1mm≤L≤3mm, 2mm≤L1≤40mm, and 2mm≤L2≤40mm.
[0010] Optionally, thicknesses of the first segment and the second segment are H, thickness of the weak part is t, thickness of the adhesive layer is h, Young's modulus of the insulation layer is E, and the following conditions are met:
[0011] 0.1mm≤H≤3mm, 1500Mpa≤E≤8000Mpa, and / or
[0012] 0.1H≤t≤0.8H, and / or
[0013] 0.02mm≤t≤0.3mm.
[0014] Optionally, the insulation layer further comprises a third segment, the third segment is formed by extending from an edge of the second segment away from the first segment, the main body comprises adjacent first and second surfaces, the tab is arranged on the first surface, the third segment is attached to the first surface through the adhesive layer and extends to the second surface.
[0015] Optionally, a length of the first segment is L1, a length of the second segment is L2, and a length of the third segment is L3, and the following conditions are met:
[0016] L3>L2, L3>L1, and / or
[0017] 15mm≤L3≤80mm.
[0018] Optionally, thicknesses of the first segment and the second segment are H, thickness of the third segment is H3, and the following conditions are met:
[0019] H3≤H, 0.02mm≤H3≤0.15mm, 0.1mm≤H≤3mm.
[0020] The battery of the second aspect embodiment of the present application comprises the battery monomer of the first aspect embodiment of the present application.
[0021] Compared with the prior art, the present application has the following beneficial effects:
[0022] In the battery monomer of some embodiments of the present application, the insulation part is at least partially arranged on the folding segment and the bending segment from the first side of the tab, thereby assisting in supporting the folding segment and the bending segment from the first side, reducing the degree of deformation of the folding segment and the bending segment, thereby reducing the risk of tab insertion and having higher safety performance.
[0023] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS
[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.
[0025] Figure 1 The structure schematic diagram of the battery monomer before the tab is bent, which is provided for the embodiments of the present application;
[0026] Figure 2 The structure schematic diagram of the battery monomer after the tab is bent, which is provided for the embodiments of the present application;
[0027] Figure 3 The structure schematic diagram of the tab and the insulating piece of the battery monomer, which is provided for the embodiments of the present application;
[0028] Figure 4 And Figure 5 The structure schematic diagram of the insulating piece of the battery monomer in the flat state, which is provided for the embodiments of the present application.
[0029] Figure: 100-battery monomer; 110-electrode assembly; 111-main body; 1111-first surface; 1112-second surface; 112-tab; 1121-contracted section; 1122-bent section; 1123-connection section; 1124-bent part; 1125-first side; 1126-second side; 120-insulating piece; 121-insulating layer; 1211-first section; 1212-second section; 1213-third section; 1214-weak part; 122-gel layer; 130-pole. DETAILED DESCRIPTION
[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, not all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.
[0031] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.
[0032] As Figure 1 , Figure 2 andFigure 3 As shown, in some embodiments of this application, the battery cell 100 includes an electrode assembly 110, an insulator 120, and a terminal post 130. The electrode assembly 110 includes a body 111 and a tab 112. The tab 112 includes a converged section 1121, a bent section 1122, and a connecting section 1123. The converged section 1121 is connected to the body 111, the connecting section 1123 is connected to the terminal post 130, and the bent section 1122 connects the converged section 1121 and the connecting section 1123. The tab 112 includes a first side 1125 and a second side 1126. The bent section 1122 bends from the converged section 1121 toward the first side 1125, and the connecting section 1123 bends from the bent section 1122 toward the second side 1126. The insulator 120 is at least partially disposed on the first side 1125 on the converged section 1121 and the bent section 1122.
[0033] The insulating element 120 can be an insulating patch, which is attached to the first side 1125 of the tab 112; the insulating element 120 can also be an insulating coating on the first side 1125 of the tab 112; the insulating element 120 can be provided only in the gathering section 1121 and the bending section 1122, or it can be further extended to the connecting section 1123 and the main body 111.
[0034] like Figure 1 As shown, before the tab 112 is bent, its thickness extends along the third direction Z. The first side 1125 and the second side 1126 are the two sides of the tab 112 along the third direction Z, respectively. During the bending process, the tab 112 bends towards the first side 1125 first, starting from the closing section 1121, and then bends towards the second side 1126.
[0035] It is understandable that if the tab 112 is bent excessively during assembly, the connecting section 1123 may squeeze the closing section 1121, causing the tab 112 to insert into the body 111, thus causing a short circuit.
[0036] In some embodiments of the battery cell 100 of this application, the insulating member 120 is at least partially disposed on the first side 1125 of the tab 112 in the closing section 1121 and the bending section 1122, and provides auxiliary support to the closing section 1121 and the bending section 1122 from the first side 1125, thereby reducing the degree of deformation of the closing section 1121 and the bending section 1122, thereby reducing the risk of the tab being inserted into the battery cell and providing higher safety performance.
[0037] like Figure 3 and Figure 4As shown, in some embodiments of this application, the insulating member 120 includes an insulating layer 121 and an adhesive layer 122. One side of the insulating layer 121 is attached to the adhesive layer 122, and the other side surface is recessed to form a weak portion 1214. The weak portion 1214 corresponds to the bend 1124 of the gathering section 1121 and the bending section 1122. The two sides of the weak portion 1214 are a first segment 1211 and a second segment 1212, respectively. The first segment 1211 is attached to the bending section 1122 through the adhesive layer 122, and the second segment 1212 is attached to the gathering section 1121 through the adhesive layer 122.
[0038] The insulating component 120 is an insulating patch, and the insulating layer 121 is bonded to the first side 1125 of the electrode tab 112 via the adhesive layer 122. The insulating layer 121 can be made of insulating materials such as PET, PP, and PI, and the adhesive layer 122 is made of pressure-sensitive adhesive, which facilitates the device to bond the insulating component 120 to the electrode tab 112 via the pressure head.
[0039] With this arrangement, the insulating component 120 can be firmly and reliably attached to the first side 1125 of the tab 112, the closing section 1121 and the bending section 1122. Since a weak part 1214 is provided between the first section 1211 and the second section 1212, the weak part 1214 corresponds to the bending point 1124 of the tab 112, which can help fix the position of the bending point 1124. When the subsequent cover plate or pole assembly pushes back obliquely, causing the tab 112 to be pulled, the degree of deformation of the tab 112 is reduced.
[0040] As an example, the insulation element 120 can be produced in the form of a roll, which is then cut to form a single insulation element 120. For the roll, the weak portion 1214 can extend along the length of the roll.
[0041] like Figure 5 As shown, in some embodiments of this application, the cross-sectional shape of the weak portion 1214 along the extending direction of the insulating member 120 is square, trapezoidal or triangular.
[0042] The extension direction of the insulating member 120 refers to the direction from the second segment 1212 to the first segment 1211, or the direction from the first segment 1211 to the second segment 1212; when the insulating member 120 is in a flattened state, the extension direction of the insulating member 120 is the second direction Y, and the cross-sectional shape of the weak part 1214 along the extension direction of the insulating member 120 refers to the cross-sectional shape on the YZ plane.
[0043] The weak portion 1214 may extend continuously along the first direction X to the edge of the insulating layer 121, or it may be disposed in the middle section of the insulating layer 121 in the first direction X; it may also include multiple segments, which are spaced apart along the first direction X.
[0044] Through the setting form, the weak portion 1214 is simple in structure and easy to manufacture.
[0045] In some embodiments of the present application, the weak portion 1214 is a hollow structure.
[0046] That is, the insulating layer 121 includes a first segment 1211 and a second segment 1212, and a gap is formed between the first segment 1211 and the second segment 1212 along the extension direction of the insulating member 120, and the gap is configured as the weak portion 1214.
[0047] Through the setting form, the thickness of the insulating member 120 at the bending portion 1124 of the tab 112 can be reduced, so that the tab 112 can be bent flexibly at the bending portion 1124, and the first segment 1211 and the second segment 1212 can assist in supporting the tab 112.
[0048] As shown in the drawings, Figure 4 in some embodiments of the present application, the length of the weak portion 1214 is L, the length of the first segment 1211 is L1, and the length of the second segment 1212 is L2 along the extension direction of the insulating member 120, and the following conditions are met:
[0049] 0.1mm≤L≤3mm, 2mm≤L1≤40mm, 2mm≤L2≤40mm.
[0050] By limiting the above parameters within the above range, the area near the bending portion 1124 of the tab 112 can be effectively supported, and the normal tab bending process will not be affected.
[0051] The thickness of the first segment 1211 and the second segment 1212 is H, the thickness of the weak portion 1214 is t, the thickness of the adhesive layer 122 is h, and the Young's modulus of the insulating layer 121 is E.
[0052] As shown in the drawings, Figure 5 in some embodiments of the present application, 0.1mm≤H≤3mm, 1500Mpa≤E≤8000Mpa.
[0053] By limiting the above parameters within the above range, the insulating layer 121 has sufficient structural strength to support the first side 1125 of the tab 112 during the bending process of the tab 112, and can also deform with the tab 112 to ensure that the tab bending process proceeds normally.
[0054] In some embodiments of the present application, 0.1H≤t≤0.8H.
[0055] By limiting the above parameters within the above range, the weak portion 1214 can function to position the bending portion 1124, and will not be too thin to cause the insulating layer 121 to break and fail.
[0056] As a preferred example form, 0.02mm≤t≤0.3mm.
[0057] Limiting the above parameters to the above range not only conforms to the current processing precision level, but also makes it easy to manufacture the shape, and can be applied to most tabs 112.
[0058] As shown in Figure 3 and Figure 4 In some embodiments of the present application, the insulating layer 121 further includes a third section 1213, which is formed by extending from the edge of the second section 1212 away from the first section 1211, the main body 111 includes an adjacent first face 1111 and a second face 1112, the tab 112 is arranged on the first face 1111, and the third section 1213 is attached to the first face 1111 through the adhesive layer 122 and extends to the second face 1112.
[0059] As shown in Figure 4 In the flattened state, the first section 1211, the second section 1212 and the third section 1213 are arranged in sequence along the second direction Y, and the first section 1211 and the second section 1212 have a weak part 1214 therebetween.
[0060] Through this arrangement, the third section 1213 can replace the traditional insulating film, and the insulating piece 120 integrates the function of the insulating film, further insulating the connection between the tab 112 and the main body 111 on the basis of the first section 1211 and the second section 1212, thereby reducing the risk of short circuit of the electrode assembly 110; the third section 1213 extends to the second face 1112, which can reduce the risk of delamination of the third section 1213 and the first face 1111, so that the insulating piece 120 can be reliably attached to the electrode assembly 110.
[0061] As shown in Figure 4 In the flattened state, the length of the first section 1211 is L1, the length of the second section 1212 is L2, and the length of the third section 1213 is L3 along the second direction Y.
[0062] In some embodiments of the present application, L3>L2, and L3>L1.
[0063] Limiting the above parameters to the above range can reliably attach the third section 1213 to the first face 1111 and extend to the second face 1112, and the broken end is attached to the second face 1112.
[0064] In some embodiments of the present application, 15mm≤L3≤80mm.
[0065] Limiting the above parameters to the above range not only conforms to the current processing precision level, but also makes it easy to manufacture the shape, and can be applied to most electrode assemblies 110.
[0066] like Figure 5 As shown, in some embodiments of this application, the thickness of the first segment 1211 and the second segment 1212 is both H, and the thickness of the third segment 1213 is H3, satisfying: H3≤H, 0.02mm≤H3≤0.15mm, 0.1mm≤H≤3mm.
[0067] In the flattened state, the thickness direction of the insulating layer 121 extends along the third direction Z.
[0068] The thickness of traditional insulating films ranges from 0.02 to 0.05 mm. By limiting the thickness of each part of the insulating layer 121 to the above range, it is possible to ensure that the first section 1211 and the second section 1212 can reliably support the first side 1125 of the tab 112, reducing the risk of tab insertion. It also allows the third section 1213 to reliably replace the insulating film. Furthermore, the thickness variation of the entire insulating layer 121 is reasonable and not prone to breakage.
[0069] In some embodiments of this application, the battery cell 100 further includes a housing, a cover, and two terminals with opposite polarities. The electrode assembly 110 is disposed inside the housing, and the cover closes the opening of the housing. The electrode assembly 110 includes two tabs 112 with opposite polarities. Each tab 112 is electrically connected to a terminal of the same polarity via an adapter. Each tab 112 is supported and insulated by an insulating member 120.
[0070] The battery in some embodiments of this application includes a battery cell 100.
[0071] Due to the characteristics of the battery cell 100 in the embodiments of this application, the batteries in some embodiments of this application also reduce the risk of inserting the tabs and have higher safety performance.
[0072] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.
[0073] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A battery cell (100), characterized by The application relates to a battery pole, which comprises the following components: a pole column (130); an electrode assembly (110) comprising a main body (111) and a tab (112), the tab (112) comprising a folding section (1121), a bending section (1122) and a connecting section (1123), the folding section (1121) being connected to the main body (111), the connecting section (1123) being connected to the pole column (130), and the bending section (1122) connecting the folding section (1121) and the connecting section (1123), wherein the tab (112) comprises a first side (1125) and a second side (1126), the bending section (1122) being bent from the folding section (1121) to the first side (1125), and the connecting section (1123) being bent from the bending section (1122) to the second side (1126); an insulating member (120) arranged at least partially on the folding section (1121) and the bending section (1122) at the first side (1125).
2. The battery cell (100) according to claim 1, characterized in that The insulating member (120) comprises an insulating layer (121) and a glue layer (122), one side of the insulating layer (121) being attached to the glue layer (122), and the other side surface being recessed to form a weak section (1214), the weak section (1214) corresponding to the bending position (1124) of the folding section (1121) and the bending section (1122), and the two sides of the weak section (1214) being a first section (1211) and a second section (1212) respectively, the first section (1211) being attached to the bending section (1122) through the glue layer (122), and the second section (1212) being attached to the folding section (1121) through the glue layer (122).
3. The battery cell (100) according to claim 2, characterized in that The cross-sectional shape of the weak section (1214) is square, trapezoidal or triangular along the extension direction of the insulating member (120).
4. The battery cell (100) according to claim 2, characterized in that The weak section (1214) is a hollow structure.
5. The battery cell (100) according to claim 2, characterized in that The length of the weak section (1214) is L, the length of the first section (1211) is L1, and the length of the second section (1212) is L2 along the extension direction of the insulating member (120), and the following conditions are met: 0.1mm<=L<=3mm, 2mm<=L1<=40mm, and 2mm<=L2<=40mm.
6. The battery cell (100) according to claim 2, characterized in that The thickness of the first section (1211) and the second section (1212) is H, the thickness of the weak section (1214) is t, the thickness of the glue layer (122) is h, and the Young's modulus of the insulating layer (121) is E, and the following conditions are met: 0.1mm<=H<=3mm, 1500Mpa<=E<=8000Mpa, and / or 0.1H<=t<=0.8H, and / or 0.02mm<=t<=0.3mm.
7. The battery cell (100) according to claim 2, characterized in that The insulating layer (121) further comprises a third section (1213) formed by extending from an edge of the second section (1212) away from the first section (1211), the main body (111) comprises an adjacent first face (1111) and a second face (1112), the tab (112) is disposed on the first face (1111), the third section (1213) is attached to the first face (1111) by the adhesive layer (122) and extends to the second face (1112).
8. The battery cell (100) according to claim 7, characterized in that The first section (1211) has a length L1, the second section (1212) has a length L2, and the third section (1213) has a length L3, satisfying: L3 > L2, L3 > L1, and / or 15 mm ≤ L3 ≤ 80 mm.
9. The battery cell (100) according to claim 7, characterized in that The first section (1211) and the second section (1212) each have a thickness H, and the third section (1213) has a thickness H3, satisfying: H3 ≤ H, 0.02 mm ≤ H3 ≤ 0.15 mm, and 0.1 mm ≤ H ≤ 3 mm.
10. A battery, characterized by A battery cell comprising the battery cell as claimed in any one of claims 1-9.