Battery cell, battery cell module and battery pack
By connecting the electrode to the terminal block through welding, the electrode tab is bent into an inverted L-shape, which solves the problem of complex connection between the electrode tab and the terminal in existing cells and the large space occupied, thereby improving the energy density and assembly efficiency of the cell.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SVOLT ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2025-05-13
- Publication Date
- 2026-06-09
AI Technical Summary
In existing square battery cells, the connection method between the tabs and terminals involves a complex bending process and occupies a large amount of space, which affects the energy density of the battery cell and leads to insufficient product competitiveness.
A C-shaped structure is formed by welding blocks, and the electrode tabs are welded together. The electrode tabs are bent into an inverted L-shape, eliminating the connecting piece. The electrode is connected to the pole by welding blocks, which simplifies the bending process and reduces space occupation.
This achieves a stable connection between the tabs and the electrode assembly, simplifies the assembly process, reduces the space occupied by the tabs, and improves the energy density and assembly efficiency of the battery cell.
Smart Images
Figure CN224342476U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery cell structure, and in particular to a battery cell, a battery cell module, and a battery pack. Background Technology
[0002] In existing square battery cells, the tabs of the electrode assembly are usually bent into an S-shaped structure (such as...). Figure 1 (As shown) it is then connected to the terminal post, and a connecting piece is also stacked between the terminal and the terminal post. This assembly method involves a complex bending process, and the bending of the connecting piece and the terminal takes up a lot of space, affecting the energy density of the cell and thus leading to insufficient product competitiveness. Utility Model Content
[0003] In view of this, the purpose of this application is to provide a battery cell, a battery cell module and a battery pack to solve the problem that the connection method between the tabs and terminals in the existing battery cells involves a complex bending process and occupies a large space.
[0004] In accordance with the above objectives, a first aspect of this utility model provides a battery cell, wherein the battery cell comprises:
[0005] pole;
[0006] The pole group forms a pole lug;
[0007] A cover plate assembly is sleeved on the outer side of the pole post; the cover plate assembly includes a welding block, the welding block forming a pole post connecting part, a bent part and a tab connecting part connected in sequence, the pole post connecting part is sleeved on the outer side of the pole post, and the tab is welded to the tab connecting part accordingly;
[0008] In the longitudinal section of the battery cell, the tab connection portion is located near the bottom of the electrode assembly near the pole post connection portion, so that the welding block is formed into a C-shaped structure, and the tab is bent into an inverted L-shape and connected to the side of the tab connection portion near the pole post connection portion.
[0009] Preferably, when the welding block is in an unassembled state, the welding block is unfolded to form a plate-like structure, and the pole post connecting part, the bending part, and the pole lug connecting part are connected sequentially along the length direction of the welding block;
[0010] When the welded block is in the assembled state, the welded block is bent.
[0011] Preferably, along the thickness direction of the welding block, the top end face of the pole connection portion is formed with a welding hole corresponding to the pole, and the pole is inserted into the welding hole and welded to the inner wall of the welding hole.
[0012] Preferably, along the thickness direction of the welding block, the top end face of the pole connection portion is further surrounded by a first recess, and the cover plate assembly includes a lower plastic, which is assembled with the welding block through the first recess.
[0013] Preferably, the thickness of the bent portion and the tab connection portion is the same, and when the welding block is in an unassembled state, the bottom ends of the pole connection portion, the bent portion, and the tab connection portion are flush.
[0014] Preferably, when the welding block is in an unassembled state, the end face of the bottom end of the electrode connection portion is formed as a welding surface for welding the electrode.
[0015] Preferably, the bent portion has multiple through holes.
[0016] Preferably, the through hole includes at least a first through hole, a second through hole, and a third through hole;
[0017] When the welding block is in an unassembled state, the first through hole and the second through hole are located at both ends of the bent portion along the width direction of the welding block, and the first through hole and the second through hole penetrate the two end faces of the bent portion respectively; the third through hole is located in the middle of the bent portion.
[0018] According to a second aspect of the present invention, a battery cell module is provided, wherein the battery cell module includes the battery cells as described above.
[0019] According to a third aspect of the present invention, a battery pack is provided, wherein the battery pack is provided with a cell module as described above.
[0020] According to the present invention, the battery cell, battery cell module and battery pack are connected by a welding block, and the other components in the cover plate assembly can be stably assembled by the structural cooperation between the welding block and the battery cell. The welding block is formed with a battery cell connection part, a bending part and a battery cell connection part connected in sequence. The battery cell connection part is sleeved on the outer side of the battery cell, and the battery cell and the battery cell connection part are welded to each other. By bending the bending part, the battery cell connection part can be located at the bottom of the battery cell connection part (close to the electrode group). At this time, the welding block is formed into a C-shaped structure, and the battery cell is bent into an inverted L-shaped shape and connected to the side of the battery cell connection part close to the battery cell connection part.
[0021] In this way, the connection between the electrode tab and the electrode assembly can be achieved without the need for a connecting piece (i.e., the structure of the connecting piece is eliminated), and the assembled electrode tab occupies less space, the bending process is also simpler, and it is easy to assemble.
[0022] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description
[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0024] Figure 1 This is a schematic diagram of the connection between the pole post and the pole tab in the prior art;
[0025] Figure 2 This is a top view of a battery cell according to an embodiment of the present invention;
[0026] Figure 3 This is a partial cross-sectional view of the battery cell along the AA direction according to an embodiment of the present invention;
[0027] Figure 4 This is a top view of the welding block according to an embodiment of the present invention;
[0028] Figure 5 This is a cross-sectional view of a welding block according to an embodiment of the present invention.
[0029] Icons: 1-Pole post; 2-Welding block; 21-Pole post connection; 211-Welding hole; 212-Allowing hole; 213-First recess; 22-Bending part; 221-First through hole; 222-Second through hole; 223-Third through hole; 23-Pole tab connection; 231-Welding surface; 3-Sealing ring; 4-Lower plastic; 5-Bright aluminum plate; 6-Upper plastic; 7-Pole tab. Detailed Implementation
[0030] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.
[0031] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.
[0032] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between.
[0033] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.
[0034] Although terms such as “first,” “second,” and “third” may be used herein to describe individual components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as the second component, assembly, region, layer, or part may also be referred to as the second component, assembly, region, layer, or part.
[0035] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element. Therefore, the term “above” includes both “above” and “below” orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relation terms used herein will be interpreted accordingly.
[0036] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.
[0037] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.
[0038] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.
[0039] According to a first aspect of this utility model, a battery cell is provided, the battery cell including a terminal post 1, a cover plate assembly, and an electrode group, etc. Figures 2 to 5 As shown, in this embodiment, the electrode post 1 is connected to the electrode lug 7 of the electrode assembly via a welding block 2. Furthermore, the cooperation between the welding block 2 and the electrode post 1 allows the remaining components of the cover plate assembly to be stably positioned on the outer side of the electrode post 1. The specific structure of the aforementioned parts of the battery cell according to this invention will be described in detail below.
[0040] In this embodiment, the cover plate assembly includes a welding block 2, which has sequentially connected pole post connecting portion 21, bending portion 22, and pole lug connecting portion 23. The pole post connecting portion 21 is used to connect with the pole post 1, and the pole lug connecting portion 23 is used to connect with the pole lug 7. Specifically, as shown... Figures 4 to 5 As shown, when the welding block 2 is in an unassembled state, the welding block 2 unfolds to form a plate-like structure, that is, the pole post connecting part 21, the bending part 22, and the pole lug connecting part 23 are sequentially arranged along the length direction (i.e., the X direction) of the welding block 2; in such a way... Figure 3 In the longitudinal section of the battery cell shown, when the welding block 2 is in the assembly state, the bending part 22 is bent, and the tab connection part 23 is located at the bottom of the pole connection part 21 (near the pole group), so that the welding block 2 is formed into a C-shaped structure. Correspondingly, the tab 7 is bent into an inverted L-shaped structure and connected to the side of the tab connection part 23 near the pole connection part 21. Thus, most of the structure of the tab 7 is located between the pole connection part 21 and the tab connection part 23, which can effectively reduce the space occupied by the connection between the tab 7 and the pole 1.
[0041] like Figure 3 and Figure 5 As shown, along the thickness direction (i.e., the Z direction) of the welding block 2, a welding hole 211 corresponding to the electrode 1 is formed on the top end face of the electrode connection 21. The electrode 1 is inserted into the welding hole 211 and welded to the inner wall of the welding hole 211. Furthermore, to improve the current-carrying capacity of the electrode 1, the electrode 1 in this embodiment is formed as an elongated cylindrical structure, that is, the cross-section of any part of the electrode 1 is formed as an elongated oval. Correspondingly, the cross-section of the welding hole 211 is also formed as an elongated oval shape (e.g., ...). Figure 4 (As shown). It should be noted that, in order to ensure the welding quality of the electrode post 1 and the welding block 2, after the electrode post 1 is welded to the welding hole 211, a gap is formed between the end face of the electrode post 1 (near the bottom end of the welding hole 211) and the bottom end of the welding hole 211 to avoid the weld mark protruding. In order to facilitate the welding of the electrode post 1 and the welding block 2, a clearance hole 212 is also provided on the bottom end face of the electrode post connection part 21, which is in communication with the welding hole 211.
[0042] In addition, such as Figure 5 As shown, along the thickness direction of the welding block 2, a first recess 213 is also formed around the top end face of the electrode connection portion 21. The cover plate assembly includes a lower plastic 4, which is correspondingly assembled with the welding block 2 through the first recess 213. The cover plate assembly also includes a light aluminum plate 5, a sealing ring 3, and an upper plastic 6, which are also correspondingly assembled between the electrode 1 and the welding block 2. The light aluminum plate 5, the sealing ring 3, the upper plastic 6, and the lower plastic 4 are all conventional components in the cell cover plate, and their structure and assembly method will not be described in detail.
[0043] More specifically, the bending portion 22 and the tab connection portion 23 have the same thickness, and as... Figures 4 to 5 As shown, when the welding block 2 is in an unassembled state, the bottom ends of the pole connecting part 21, the bending part 22 and the pole tab connecting part 23 are flush. At this time, the end face of the bottom end of the welding block 2 is formed into a rectangular shape, and the end face of the bottom end of the pole tab connecting part 23 is formed into a welding surface 231 for welding the pole tab 7.
[0044] Furthermore, the bending portion 22 has multiple through holes to improve the smoothness of bending. In this embodiment, the bending portion 22 is provided with a first through hole 221, a second through hole 222, and a third through hole 223. When the welding block 2 is in an unassembled state, such as... Figure 4As shown, along the width direction (i.e., the Y direction) of the welding block 2, the first through hole 221 and the second through hole 222 are located at both ends of the bent portion 22, and the first through hole 221 and the second through hole 222 respectively penetrate the two end faces of the bent portion 22; the third through hole 223 is located in the middle of the bent portion 22. It should be noted that there are no specific restrictions on the number, specifications, and shape of the through holes in the bent portion 22, as long as the above-mentioned technical effects can be achieved. In this embodiment, the first through hole 221 and the second through hole 222 are formed into a U-shaped structure, and the third through hole 223 is formed into an elongated oval shape similar to the welding hole 211, so as to improve the consistency of the overall structure of the welding block 2.
[0045] According to the battery cell of this utility model, the connection between the pole post 1 and the tab 7 is achieved by the welding block 2, and the structural cooperation between the welding block 2 and the pole post 1 can stably assemble the other components in the cover plate assembly; the welding block 2 is formed with a pole post connecting part 21, a bending part 22 and a tab connecting part 23 connected in sequence. The pole post connecting part 21 is sleeved on the outer side of the pole post 1, and the tab 7 is welded to the tab connecting part 23. Then, by bending the bending part 22, the tab connecting part 23 can be located at the bottom of the pole post connecting part 21 (near the pole group). At this time, the welding block 2 is formed into a C-shaped structure, and the tab 7 is bent into an inverted L-shaped shape and connected to the side of the tab connecting part 23 near the pole post connecting part 21.
[0046] In this way, the connection between the tab 7 and the electrode group can be achieved without connecting pieces, and the assembled tab 7 occupies less space, and the bending process is also relatively simple, making it easy to assemble.
[0047] According to a second aspect of the present invention, a battery cell module is provided, the battery cell module comprising the battery cells described above.
[0048] According to a third aspect of the present invention, a battery pack is provided, the battery pack being provided with the cell module as described above.
[0049] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.
Claims
1. A battery cell, characterized in that, The battery cell includes: pole; The pole group forms a pole ear; A cover plate assembly is sleeved on the outer side of the pole post; the cover plate assembly includes a welding block, the welding block forming a pole post connecting part, a bent part and a tab connecting part connected in sequence, the pole post connecting part is sleeved on the outer side of the pole post, and the tab is welded to the tab connecting part accordingly; In the longitudinal section of the battery cell, the tab connection portion is located near the bottom of the electrode assembly near the pole post connection portion, so that the welding block is formed into a C-shaped structure, and the tab is bent into an inverted L-shape and connected to the side of the tab connection portion near the pole post connection portion.
2. The battery cell according to claim 1, characterized in that, When the welding block is in an unassembled state, the welding block unfolds to form a plate-like structure, and the pole post connecting part, the bending part, and the pole lug connecting part are connected sequentially along the length direction of the welding block; When the welded block is in the assembled state, the welded block is bent.
3. The battery cell according to claim 2, characterized in that, Along the thickness direction of the welding block, the top end face of the pole connection is formed with a welding hole corresponding to the pole, and the pole is inserted into the welding hole and welded to the inner wall of the welding hole.
4. The battery cell according to claim 3, characterized in that, Along the thickness direction of the welding block, the top end face of the pole connection is also surrounded by a first recess, and the cover plate assembly includes a lower plastic, which is assembled with the welding block through the first recess.
5. The battery cell according to claim 2, characterized in that, The bending portion and the tab connection portion have the same thickness, and when the welding block is in an unassembled state, the bottom ends of the pole connection portion, the bending portion, and the tab connection portion are flush.
6. The battery cell according to claim 5, characterized in that, When the welding block is in an unassembled state, the end face of the bottom end of the electrode connection is formed as a welding surface for welding the electrode.
7. The battery cell according to claim 2, characterized in that, The bent portion has multiple through holes.
8. The battery cell according to claim 7, characterized in that, The through hole includes at least a first through hole, a second through hole, and a third through hole; When the welding block is in an unassembled state, the first through hole and the second through hole are located at both ends of the bent portion along the width direction of the welding block, and the first through hole and the second through hole penetrate the two end faces of the bent portion respectively; the third through hole is located in the middle of the bent portion.
9. A battery cell module, characterized in that, The battery cell module includes the battery cell as described in any one of claims 1 to 8.
10. A battery pack, characterized in that, The battery pack is provided with the cell module as described in claim 9.