Battery cell flexible connection sheet and battery
By designing a battery cell soft connection piece that includes a pole connecting part, a pole connecting part, a groove, a buffering part, a welding part and a through-hole, the problems of heat accumulation and welding deformation during frequent charge and discharge cycles of traditional soft connection pieces are solved, and higher welding quality, assembly accuracy and battery performance are achieved.
Patent Information
- Application Number
- CN202421709785.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-18
- Publication Date
- 2025-06-03
- Estimated Expiration
- 2034-07-18
AI Technical Summary
Traditional soft connection sheets are prone to heat accumulation during frequent charging and discharging cycles, resulting in a Joule thermal effect, and are prone to deformation during welding, affecting assembly accuracy and battery electrical performance.
A battery-cell soft connection piece is designed, including a soft connection piece body, a pole connecting part, an ear connecting part, a groove, a buffering part, a welding part and a through hole. This structure limits the deformation range through the slope structure and through-hole dispersing thermal and mechanical stresses during welding, ensuring welding quality and assembly accuracy.
It effectively reduces deformation and damage of welding parts, extends the service life of soft connection sheets, improves the thermal management performance and safety of the battery, and reduces production costs.
Smart Images
Figure CN222940147U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of battery assembly, in particular to a soft connection piece for an electric core. Background Art
[0002] The connection piece between the battery core and the top cover assembly is an important component in the battery manufacturing and assembly process, ensuring continuous and stable contact and efficient power transmission between the pole column and the internal structure of the battery core.
[0003] However, due to structural requirements, traditional soft connection pieces often include structures such as extension parts or protruding parts. Although the flexibility and adaptability of the connection are enhanced to a certain extent, heat accumulation is likely to occur at the same time. Especially when the battery undergoes frequent charge and discharge cycles, significant Joule heat effects will be generated when the current flows through these structural areas. On the other hand, due to the material and the soft nature of the soft connection piece itself, deformation is likely to occur during welding, which not only affects the subsequent assembly accuracy of the battery but also may lead to an increase in contact resistance, affecting the electrical performance and reliability of the battery. Therefore, how to control the deformation of the soft connection piece during the design and manufacturing process to ensure the welding quality and assembly accuracy is also a problem that needs to be solved. Summary of the Utility Model
[0004] In order to overcome the defects of the prior art, the technical problem to be solved by the utility model is to provide a soft connection piece for an electric core, adopting the following technical solutions:
[0005] The utility model provides a soft connection piece for an electric core, including a soft connection piece body. A pole column connection part and an ear connection part are arranged on the soft connection piece body. Grooves are arranged on the front and back surfaces of the pole column connection part. A buffer part is arranged around the outer edge of the groove. A welding part is arranged in the groove, and a through hole is arranged in the welding part.
[0006] As a further improvement, the thickness T of the soft connection piece body ≤ 1 mm.
[0007] As a further improvement, a slope structure is arranged between the groove and the soft connection piece body to form the buffer part.
[0008] As a further improvement, the slope of the slope structure is an arc surface.
[0009] As a further improvement, the bottom surface of the groove is a plane, the welding part is annular, and the through hole is arranged at the center of the circle of the annulus.
[0010] As a further improvement, the pole column connection part is arranged on the transverse central axis of the soft connection piece body.
[0011] As a further improvement, it includes two ear connection parts, and the two ear connection parts are symmetrically arranged on the front and back sides of the transverse central axis.
[0012] For further improvement, it further includes positioning holes, and the above-mentioned positioning holes are arranged on the transverse central axis of the soft connection piece body.
[0013] On the other hand, a battery is also provided, including a battery housing and a top cover assembly arranged on the top of the battery housing. A battery core is arranged in the battery housing, and two soft connection pieces with the structure described in any one of the above are arranged between the battery core and the top cover assembly. The pole connection part is welded to the pole of the top cover assembly, and the tab connection part is welded to the tab of the battery core.
[0014] For further improvement, the above-mentioned top cover assembly includes a lower plastic, and the lower plastic includes a lower protrusion, and the lower protrusion passes through the positioning hole of the soft connection piece body.
[0015] Compared with the prior art, the beneficial effects of the present utility model are:
[0016] First, the present utility model is provided with a pole connection part and a tab connection part on the soft connection piece body. Grooves are arranged on both the front and back sides of the pole connection part, welding parts are arranged in the grooves, and through holes are arranged inside the welding parts. When the top cover assembly of the battery is installed, the lower end of the pole structure is welded to the welding part. The groove structure enables the top cover structure to be accurately aligned, and the through holes arranged inside the welding part help to discharge gas during the welding process, and at the same time disperse and reduce the thermal stress and mechanical stress during the welding process, thereby reducing the deformation and damage of the welded parts and prolonging the service life of the soft connection piece.
[0017] Second, the present utility model is provided with a slope structure between the groove and the soft connection piece body, and the slope structure can be a flat slope or an arc surface. During welding, the welding part will deform, and the slope structure can limit the deformation range within the groove and will not extend to other parts of the soft connection piece, ensuring the overall flatness, avoiding the overall deformation of the soft connection piece due to welding, and ensuring the accuracy and sealing performance of the subsequent installation of the top cover assembly.
[0018] Third, the overall thickness T of the battery core connection piece of the present utility model is ≤ 1 mm, which reduces heat accumulation, is more conducive to heat dissipation, uses less materials, and reduces production costs. The thinner structure can also enable the welding of the soft connection piece and the pole to have more welding process adaptability.
[0019] Fourth, the overall structure of the present utility model is symmetrical along the transverse central axis, and the front and back structures are the same, reducing the processing and mold opening costs of parts and being conducive to mass production. Description of the Drawings
[0020] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.
[0021] Figure 1 Schematic diagram of the overall structure of the present utility model;
[0022] Figure 2 Schematic diagram of the structure of the present utility model from a top-down perspective;
[0023] Figure 3 is Figure 2 Cross-sectional view at A - A;
[0024] Figure 4 is Figure 3 Partial enlarged view at A;
[0025] Figure 5 Assembly schematic diagram of the present utility model.
[0026] Reference numerals:
[0027] 100 - Soft connection sheet body; 200 - Battery housing; 300 - Top cover assembly; 310 - Upper cover plate; 311 - Terminal post; 320 - Lower plastic; 400 - Battery core; 410 - Tab.
[0028] 1 - Terminal post connection part; 2 - Tab connection part; 3 - Positioning hole; 11 - Groove; 12 - Buffer part; 13 - Welding part; 14 - Through hole. Detailed implementation manners
[0029] For the convenience of those skilled in the art to understand, the following will further describe the structure of the present utility model in detail in combination with the drawings in the embodiments:
[0030] In the description of the present utility model, the orientation or positional relationship indicated by terms such as "part", "side", "end", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.
[0031] Such as Figure 1 and Figure 2As shown in the figure, the present application provides a soft connection piece for an electric core, which includes a soft connection piece body 100. A pole connection part 1 and an ear connection part 2 are arranged on the soft connection piece body 100. Among them, grooves 11 are arranged on both the front and back surfaces of the pole connection part 1. A buffer part 12 is arranged around the outer edge of the groove 11, a welding part 13 is arranged in the groove 11, and a through hole 14 is arranged in the welding part 13.
[0032] As Figure 2 shown in a specific embodiment, the pole connection part 1 is arranged on the horizontal central axis of the soft connection piece body 100, and the ear connection part 2 is arranged on the front and back sides of the pole connection part 1. This structure is applicable to a double-wound core battery. It should be understood that the setting position of the ear connection part 2 should match the type of the battery and the distribution of the ears 410. Preferably, as Figure 1 shown, the ear connection parts 2 are symmetrically arranged on the front and back sides of the pole connection part 1.
[0033] For the convenience of description, this specification takes a double-wound core square battery as an example. Figure 5 As an exploded view of a double-wound core square battery, as shown in the figure, it includes a battery case 200. A top cover assembly 300 is fixedly covered on the top of the battery case 200. The top cover assembly 300 includes an upper cover plate 310 and a lower plastic 320. A positive pole column 311 and a negative pole column 311 are arranged on the upper cover plate 310. The lower plastic 320 is fixedly arranged on the lower side of the upper cover plate 310, and the positive pole column 311 and the negative pole column 311 pass through the lower plastic 320 and extend downward for electrically connecting with the battery cores 400. Two battery cores 400 are arranged in the battery case 200. A positive ear 410 and a negative ear 410 are arranged at the upper end of each battery core 400, and the positive ears 410 and the negative ears 410 of the two battery cores 400 are located on the same side. Two of the above-mentioned soft connection pieces for electric cores are arranged between the top cover assembly 300 and the battery cores 400 as a positive connection piece and a negative connection piece. Specifically, the pole connection parts 1 of the two soft connection pieces for electric cores are electrically connected to the positive pole column 311 and the negative pole column 311 respectively. The connection of the pole column 311 is preferably welded by laser welding; the ear connection parts 2 of the positive connection piece are electrically connected to the positive ears 410 of the two battery cores 400 respectively, and the ear connection parts 2 of the negative connection piece are electrically connected to the negative ears 410 of the two battery cores 400 respectively. The connection of the ears 410 is preferably welded by ultrasonic welding. Further, the shape of the above-mentioned groove 11 corresponds to the shape of the contact of the pole column 311. In one embodiment, the contact of the pole column 311 is cylindrical, the groove 11 of the pole connection part 1 is circular, the welding part 13 in the groove 11 is annular, and the through hole 14 is arranged at the center of the annular welding part 13.
[0034] Furthermore, the thickness T of the soft connection piece body 100 is T ≤ 1 mm, and the overall contour is regular, such as rectangular or circular. The thin and light structure is conducive to the penetration of the welding process on the one hand, and on the other hand, it enables the soft connection piece to maintain low-resistance characteristics, reduces the loss of electric energy during transmission, improves the energy efficiency. The regular contour helps the current to be evenly distributed on the connection piece, avoids hot spot areas with too high current density, reduces local overheating phenomena, and improves the thermal management performance and safety of the battery.
[0035] As Figure 3 and Figure 4 shown, a ramp structure is provided between the groove 11 and the soft connection piece body 100 to form the above-mentioned buffer portion 12.
[0036] During installation, the contact of the terminal post 311 is inserted into the front groove 11 of the terminal post connection portion 1, and the terminal post 311 is positioned through the groove 11 to prevent deviation during welding. A reserved space is formed between the groove 11 on the back of the terminal post connection portion 1 and the battery core 400. When laser welding is used for welding, welding is performed from the corresponding position on the back of the cell soft connection piece. Since the same groove 11 structure is provided on the back of the cell soft connection piece, the laser welding area can be planned within the groove 11 on the back. During the welding process, the welding area will generate thermal deformation or material expansion due to high temperature. This part of the deformation will cause a certain amount of tension on the structure of the groove 11 part of the cell soft connection piece. The through hole 14 provided in the welding portion 13 provides a buffer release space to prevent the groove 11 of the terminal post connection portion 1 from being torn; the above-mentioned ramp structure limits the thermal deformation and material expansion within the terminal post connection portion 1 and prevents it from affecting the entire soft connection piece body 100. In addition, the above-mentioned reserved space is used to accommodate the material expansion generated by welding, avoiding local thickening that may cause difficulties in component assembly, or even the top cover assembly 300 cannot be buckled, and improving the overall assembly accuracy.
[0037] Further, as Figure 4 shown, the slope surface of the ramp structure is an arc surface. When the soft connection piece is subjected to welding thermal stress or other mechanical forces, the arc surface can more evenly disperse the local pressure, reduce stress concentration, prevent metal fatigue, and prevent structural tearing.
[0038] As Figure 1 and Figure 2As shown, the flexible connection piece body 100 is further provided with a positioning hole 3, which matches with the positioning post (not shown in the figure) of the lower plastic 320 and is used for positioning the battery cell flexible connection piece. Preferably, the positioning hole 3 is arranged on the horizontal central axis and on the inner side of the pole connection part 1. More specifically, two explosion-proof valves are arranged on the top cover assembly 300. The explosion-proof valves are located inside the positive and negative pole posts 311. The explosion-proof valves and the corresponding positions of the lower plastic 320 are provided with lower convex structures to form the above-mentioned positioning posts. Preferably, the length L of the positioning post is ≥ 1.5 mm, and an interference connection is formed with the positioning hole 3 to achieve the purpose of positioning and fixing. It should be understood that if the top cover assembly 300 is not provided with an explosion-proof structure, or the explosion-proof structure is not arranged at the position corresponding to the flexible connection piece body 100, the above-mentioned positioning hole 3 does not need to be opened.
[0039] In addition, the front and back sides of the battery cell flexible connection piece with the above structure have the same structure and are symmetric about the horizontal central axis. It can be used as a positive connection piece or a negative connection piece, reducing the processing and mold opening costs of parts and being beneficial to the mass production of the battery cell assembly.
[0040] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A battery cell flexible connecting sheet, comprising a flexible connecting sheet body (100), wherein the flexible connecting sheet body (100) is provided with a pole connecting portion (1) and a pole ear connecting portion (2), characterized in that: Grooves (11) are provided on both the front and back sides of the pole connecting portion (1), a buffer portion (12) is provided around the outer edge of the groove (11), a welding portion (13) is provided in the groove (11), and a through hole (14) is provided in the welding portion (13).
2. A battery core flexible connecting sheet as claimed in claim 1, characterized in that: The thickness T of the soft connection sheet body (100) is ≤1 mm.
3. The battery core flexible connecting sheet according to claim 1, characterized in that: A slope structure is provided between the groove (11) and the flexible connecting piece body (100), forming the buffer portion (12).
4. A battery core flexible connecting sheet as claimed in claim 3, characterized in that: The slope surface of the slope structure is a curved surface.
5. The battery core flexible connecting sheet according to claim 3, characterized in that: The bottom surface of the groove (11) is a plane, the welding portion (13) is annular, and the through hole (14) is provided at the center of the annular welding portion (13).
6. The battery core flexible connecting sheet according to claim 1, characterized in that: The pole connecting portion (1) is arranged on the transverse center axis of the flexible connecting piece body (100).
7. A battery core flexible connecting sheet as claimed in claim 6, characterized in that: It comprises two pole lug connection parts (2), wherein the two pole lug connection parts (2) are arranged at the front and rear sides of the pole connection part (1).
8. A battery core flexible connecting sheet as claimed in claim 7, characterized in that: It also comprises a positioning hole (3), wherein the positioning hole (3) is arranged on the transverse center axis of the soft connection sheet body (100).
9. A battery, comprising a battery housing (200) and a top cover assembly (300) disposed on the top of the battery housing (200), wherein a battery winding core (400) is disposed in the battery housing (200), characterized in that: Two structures such as the soft connecting pieces described in any one of claims 1 to 8 are arranged between the battery roll core (400) and the top cover assembly (300), the pole connecting portion (1) is welded to the pole (311) of the top cover assembly (300), and the pole ear connecting portion (2) is welded to the pole ear (410) of the battery cell.
10. A battery as claimed in claim 9, characterized in that: The top cover assembly (300) comprises a lower plastic (320), wherein the lower plastic (320) comprises a lower protrusion, and the lower protrusion penetrates a positioning hole (3) of the flexible connection sheet body (100).