Battery cell and battery pack
By inserting auxiliary components and setting a protrusion structure between the terminal post and the tab, the problem of difficult welding between the terminal post and the tab is solved, achieving efficient welding and low-cost production of battery cells.
Patent Information
- Application Number
- CN202423023424.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-09
- Publication Date
- 2025-11-28
- Estimated Expiration
- 2034-12-09
AI Technical Summary
The welding of the terminals and tabs in existing lithium-ion batteries is difficult, the welding effect is poor, and the flexibility is poor, which affects the battery safety performance.
An auxiliary element is clamped between the pole post and the lug, and a protrusion structure is set on the auxiliary element to realize resistance welding. The auxiliary element is an independent structure, and different shapes can be selected according to the shape of the pole post to improve welding flexibility.
This achieves a good welding effect between the tabs and the terminals, improves the safety and processing simplicity of the battery cells, and reduces costs.
Smart Images
Figure CN223612623U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to battery technology field especially relates to a battery monomer and battery pack. BACKGROUND
[0002] With the rapid development of new energy, lithium ion battery is applied more and more widely, and the safety performance of lithium ion battery is required higher and higher. Among them, the effect of welding of the pole and the tab sheet of the battery directly affects the safety performance of the battery. In the actual production of the battery, the pole and the tab sheet are connected by resistance welding. Usually, in order to improve the welding effect, a protruding part is needed on the welding surface of the pole. However, it is difficult to form the protruding part on the pole, which further leads to the difficulty in forming the whole pole. Once the pole is formed, the arrangement of the protruding part on the pole cannot be changed, which makes the welding flexibility of the pole and the tab sheet poor.
[0003] Therefore, it is urgent to provide a battery monomer and a battery pack to solve the above problems. INVENTION CONTENTS
[0004] The first purpose of the utility model is to provide a battery monomer, which is simple to form and low in cost. The resistance welding of the tab sheet and the pole is assisted to achieve good welding effect. The welding flexibility of the pole and the tab sheet is high.
[0005] To achieve this purpose, the utility model adopts the following technical solutions:
[0006] The battery monomer comprises:
[0007] The battery monomer comprises:
[0008] The battery monomer comprises:
[0009] The battery monomer comprises:
[0010] The battery monomer comprises:
[0011] The battery monomer comprises:
[0012] As an optional technical solution of the battery monomer, the auxiliary element comprises a connecting sheet, the connecting sheet is provided with a plurality of first protruding point structures protruding towards the tab sheet on the side close to the tab sheet, and the plurality of first protruding point structures are arranged at intervals.
[0013] As an optional technical solution of the battery monomer, a plurality of second protruding point structures protruding towards the direction of the pole column are arranged on the side of the connecting sheet close to the pole column.
[0014] As an optional technical solution of the battery monomer, the shape of the first protruding point structure is the same as that of the second protruding point structure.
[0015] As an optional technical solution of the battery monomer, the first protruding point structures are uniformly distributed on the connecting sheet; and / or,
[0016] The second protruding point structures are uniformly distributed on the connecting sheet.
[0017] As an optional technical solution of the battery monomer, the first protruding point structures and the second protruding point structures are arranged staggeredly on the connecting sheet.
[0018] As an optional technical solution of the battery monomer, the first protruding point structure is formed by stamping the connecting sheet.
[0019] As an optional technical solution of the battery monomer, the second protruding point structure is formed by stamping the connecting sheet.
[0020] As an optional technical solution of the battery monomer, the shape of the connecting sheet is matched with the cross-sectional shape of the pole column.
[0021] The second purpose of the utility model lies in providing a battery pack which is simple to process, low in cost and high in safety.
[0022] To achieve the purpose, the utility model adopts the following technical scheme.
[0023] The battery pack comprises a plurality of the above battery monomers.
[0024] The utility model has the advantages of:
[0025] The battery monomer provided by the utility model comprises a battery core, a shell, a cover plate, a pole column and an auxiliary element. The battery core has a tab sheet extending from an end thereof and used for electrically connecting with the pole column. The battery core is located in the shell, the cover plate is arranged on an opening of the shell, and the shell and the cover plate jointly protect the battery core. The pole column is connected to the cover plate, and the auxiliary element is arranged between the pole column and the tab sheet and is welded to the pole column and the tab sheet on two sides. The auxiliary element is used for realizing resistance welding between the tab sheet and the pole column, so that the welding effect between the tab sheet and the pole column is good. The auxiliary element is an independent structure and is not integrated with the pole column, so that the pole column is simple to form, and different shapes of the auxiliary element can be selected according to the shape of the pole column, thereby improving the flexibility of resistance welding between the pole column and the tab sheet. BRIEF DESCRIPTION OF DRAWINGS
[0026] Figure 1It is the explosion map of the battery monomer provided by the embodiment of the utility model;
[0027] Figure 2 It is the first structure schematic view of the auxiliary element of the battery monomer provided by the embodiment of the utility model;
[0028] Figure 3 It is the second structure schematic view of the auxiliary element of the battery monomer provided by the embodiment of the utility model;
[0029] Figure 4 It is the third structure schematic view of the auxiliary element of the battery monomer provided by the embodiment of the utility model.
[0030] In the drawing,
[0031] 100, the electric core, 110, the tab sheet, 200, the cover plate, 300, the pole, 400, the auxiliary element, 410, the connecting sheet, 420, the first convex point structure, 430, the second convex point structure. Specific implementation
[0032] The utility model will be further explained in detail in combination with the drawings and embodiments. It can be understood that the specific embodiments described here are only used to explain the utility model, and not limited to the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawing, not all the structures.
[0033] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through the intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0034] In the utility model, unless otherwise explicitly specified and limited, the first feature "on" or "below" the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.
[0035] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.
[0036] The battery cell provided in this embodiment has a simple and low cost in forming the electrode post; it also assists in the resistance welding of the electrode tab and the electrode post, resulting in a good welding effect; and the welding of the electrode post and the electrode tab is highly flexible.
[0037] Specifically, such as Figures 1 to 4 As shown, the battery cell includes a cell 100, a casing, a cover plate 200, a terminal post 300, and an auxiliary element 400. The cell 100 has a tab 110 extending from its end, and the cell 100 is located inside the casing. The cover plate 200 covers an opening in the casing near the tab 110. The terminal post 300 passes through and is connected to the cover plate 200. The auxiliary element 400 is sandwiched between the terminal post 300 and the tab 110, and is welded to both the terminal post 300 and the tab 110 on its two sides.
[0038] Based on the above design, the battery cell 100 is located inside the housing, and the cover plate 200 covers the opening of the housing. The housing and the cover plate together protect the battery cell 100. The terminal post 300 is inserted and connected to the cover plate 200. The auxiliary element 400 is sandwiched between the terminal post 300 and the tab 110, and is welded to the terminal post 300 and the tab 110 on both sides respectively. The auxiliary element 400 enables resistance welding between the tab 110 and the terminal post 300, resulting in a good welding effect. Furthermore, the auxiliary element 400 is an independent structure, not integrated with the terminal post 300, which simplifies the forming of the terminal post 300. Different shapes of auxiliary elements 400 can be selected according to the shape of the terminal post 300, thereby improving the flexibility of resistance welding between the terminal post 300 and the tab 110.
[0039] Furthermore, continue as Figure 2 and Figure 4 As shown, the auxiliary element 400 includes a connecting piece 410. The connecting piece 410 has multiple first protrusion structures 420 protruding towards the electrode tab 110 on the side near the electrode tab 110. These multiple first protrusion structures 420 are spaced apart, and the number of first protrusion structures 420 can be two, three, or seven, etc. In this embodiment, the number of first protrusion structures 420 is eight. The first protrusion structures 420 can reduce the flow area between the electrode tab 110 and the connecting piece 410, thereby assisting in the welding of the connecting piece 410 and the electrode tab 110, ultimately improving the welding effect between the pole post 300 and the electrode tab 110. Furthermore, the first protrusion structures 420 are simple to set and have low processing costs.
[0040] In order to further improve the welding effect of the tab sheet 110 and the pole 300, the connecting sheet 410 is provided with a plurality of second protruding point structures 430 protruding towards the pole 300 on the side close to the pole 300, as shown in Figure 3 and Figure 4 The plurality of second protruding point structures 430 are arranged at intervals, and the number of the second protruding point structures 430 can be two, three, or six, etc. In the embodiment, the number of the second protruding point structures 430 is nine. The second protruding point structures 430 can reduce the flow area of the pole 300 and the connecting sheet 410, thereby assisting the welding of the connecting sheet 410 and the pole 300, and finally improving the welding effect of the pole 300 and the tab sheet 110. Moreover, the second protruding point structures 430 are simple to set and low in processing cost.
[0041] In order to facilitate processing, the shape of the first protruding point structure 420 is the same as that of the second protruding point structure 430. Of course, the shape of the first protruding point structure 420 can also be different from that of the second protruding point structure 430.
[0042] Optionally, the first protruding point structures 420 are uniformly distributed on the connecting sheet 410, so that the welding at the connection between the connecting sheet 410 and the tab sheet 110 is uniform, thereby the stress is uniform.
[0043] Optionally, the second protruding point structures 430 are uniformly distributed on the connecting sheet 410, so that the welding at the connection between the connecting sheet 410 and the pole 300 is uniform, thereby the stress is uniform.
[0044] Preferably, the first protruding point structures 420 are uniformly distributed on the connecting sheet 410, and the second protruding point structures 430 are uniformly distributed on the connecting sheet 410.
[0045] Further, the first protruding point structures 420 and the second protruding point structures 430 are arranged staggered with each other on the connecting sheet 410, so that the stress of the entire connecting sheet 410 is uniform. Moreover, the first protruding point structures 420 and the second protruding point structures 430 are arranged staggered with each other, so that the first protruding point structures 420 and the second protruding point structures 430 do not interfere with each other in processing, thereby reducing the processing difficulty.
[0046] Optionally, as shown in Figure 2 and Figure 3 , the first protruding point structures 420 are formed by stamping the connecting sheet 410, that is, the connecting sheet 410 is stamped to bulge towards the tab sheet 110 to form the first protruding point structures 420, which is simple in processing operation and saves materials; and a groove is formed on the side of the connecting sheet 410 away from the tab sheet 110, which facilitates the welding of the connecting sheet 410 and the pole 300.
[0047] Optionally, the second convex structure 430 is formed by stamping the connecting sheet 410, that is, the connecting sheet 410 is stamped to form the second convex structure 430 towards the pole column 300, the processing operation is simple and saves materials; and a groove is formed on the side of the connecting sheet 410 away from the pole column 300, facilitating the welding of the connecting sheet 410 and the tab sheet 110.
[0048] Preferably, the first convex structure 420 and the second convex structure 430 are both formed by stamping the connecting sheet 410.
[0049] In the embodiment, the shape of the connecting sheet 410 is adapted to the cross-sectional shape of the pole column 300. As shown in the drawings, the connecting sheet 410 is substantially square, and the four corners are rounded. Along the length direction of the cover plate 200, a plurality of rows of first convex structures 420 and a plurality of rows of second convex structures 430 are arranged alternately. Along the width direction of the cover plate 200, a plurality of first convex structures 420 are distributed uniformly at intervals; and a plurality of second convex structures 430 are distributed uniformly at intervals. In the embodiment, along the width direction of the cover plate 200, in each row of first convex structures 420, two first convex structures 420 are distributed at intervals; and in each row of second convex structures 430, three second convex structures 430 are distributed at intervals. Figure 1
[0050] It should be noted that in the embodiment, the battery monomer includes two pole columns 300, two auxiliary elements 400 and two groups of tab sheets 110, the two pole columns 300 refer to one positive pole column and one negative pole column, the two pole columns 300 are respectively welded with the two groups of tab sheets 110, and the assembly mode of the two pole columns 300 and the cover plate 200 can be the same or different; and the welding mode of the two pole columns 300 and the corresponding tab sheets 110 can be the same or different.
[0051] The battery pack provided in the embodiment is simple to process, low in cost and high in safety.
[0052] Specifically, the battery pack includes a plurality of the above battery monomers. Exemplarily, the number of the battery monomers can be two, three, five or nine, and the like, which will not be listed one by one here. Since the battery monomer includes the auxiliary element 400, the resistance welding between the tab sheet 110 and the pole column 300 is realized through the auxiliary element 400, so that the welding effect between the tab sheet 110 and the pole column 300 is good, and the safety of the battery monomer is improved. Moreover, the auxiliary element 400 is an independent structure and is not integrated with the pole column 300, so that the pole column 300 is simple to form, and different shapes of auxiliary elements 400 can be selected according to the shape of the pole column 300, thereby improving the flexibility of the resistance welding between the pole column 300 and the tab sheet 110, and further improving the simplicity of the battery pack in processing and the low cost.
[0053] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, various obvious changes, re-adjustments and replacements can be made without departing from the protection scope of the present application. Here, it is not necessary and also impossible to enumerate all the implementation modes. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application claim.
Claims
1. A battery cell, characterized by The battery cell comprises: an electric core (100) with an end extending tab sheet (110); a shell in which the electric core (100) is located; a cover plate (200) covering an opening of the shell near the tab sheet (110); a pole (300) connected to the cover plate (200); an auxiliary element (400) clamped between the pole (300) and the tab sheet (110), and welded to the pole (300) and the tab sheet (110) on both sides.
2. The battery cell of claim 1, wherein, The auxiliary element (400) comprises a connecting sheet (410) provided with a plurality of first protruding point structures (420) protruding towards the tab sheet (110) on the side near the tab sheet (110), and the plurality of first protruding point structures (420) are arranged at intervals.
3. The battery cell of claim 2, wherein, The connecting sheet (410) is provided with a plurality of second protruding point structures (430) protruding towards the pole (300) on the side near the pole (300), and the plurality of second protruding point structures (430) are arranged at intervals.
4. The battery cell of claim 3, wherein, The shape of the first protruding point structure (420) is the same as that of the second protruding point structure (430).
5. The battery cell of claim 3, wherein, The first protruding point structures (420) are uniformly distributed on the connecting sheet (410); and / or, The second protruding point structures (430) are uniformly distributed on the connecting sheet (410).
6. The battery cell of claim 5, wherein, The first protruding point structures (420) and the second protruding point structures (430) are arranged staggered on the connecting sheet (410).
7. The battery cell of claim 6, wherein, The first protruding point structures (420) are formed by stamping the connecting sheet (410).
8. The battery cell of claim 6, wherein, The second protruding point structures (430) are formed by stamping the connecting sheet (410).
9. The battery cell of claim 6, wherein, The shape of the connecting sheet (410) is adapted to the cross-sectional shape of the pole (300).
10. A battery pack characterized by The battery cell comprises a plurality of battery cells according to any one of claims 1-9.