Battery cover plate and battery
By designing composite pole assembly in the micro battery cover and adopting a hot press bonding process, the problem of easily deformation or breaking of the pole connection parts during the bonding force test is solved, and the safety and stability of the battery are improved.
Patent Information
- Application Number
- CN202420193552.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-26
- Publication Date
- 2025-02-25
- Estimated Expiration
- 2034-01-26
AI Technical Summary
In the field of micro batteries, during the test of the adhesive force of existing battery covers, the connection between the pole column and the cover body is easily deformed or broken by excessive thrust, resulting in the inability to measure the real adhesive force, affecting battery safety.
A battery cover is designed, and its pole assembly includes a pole and a connecting piece, which is riveted with the connecting piece to form a composite assembly, which increases shear strength, and is arranged through a stacking of the adhesive and the cover body, using heat Pressure bonding process for connection.
It improves the safety and stability of the battery, avoids deformation or breakage of the pole joints during adhesive force testing, ensures that the true adhesive force can be effectively measured, and improves the adaptability of the process design.
Smart Images
Figure CN222530760U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, in particular to a battery cover and a battery. Background Art
[0002] The existing battery covers on the market are generally stacked in sequence by the cover body, connecting pieces and poles, where the connecting pieces are generally made of materials such as thermosensitive adhesive, and the cover body and the cap are insulated and connected by hot pressing. After the battery cover is assembled, it is necessary to test the adhesion of the battery cover, that is, after the battery is assembled and filled with liquid, a thrust is applied to the pole toward the shell, and the thrust when the pole falls off the cover body is calculated as the adhesion. However, in the field of micro batteries, the size is small, often measured in millimeters. When the adhesion is greater than the mechanical strength of the pole itself, the connection between the pole and the cover body is prone to excessive thrust and deformation or even breakage, resulting in the inability to measure the true adhesion, which is an important parameter affecting battery safety. Summary of the invention
[0003] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a battery cover and a battery.
[0004] The purpose of this utility model is achieved through the following technical solutions:
[0005] A battery cover comprises: a cover body, an adhesive and a pole assembly, the pole assembly comprises a pole and a connecting piece, the pole and the connecting piece are riveted, the cover body, the adhesive and the connecting piece are stacked, a first through hole is opened on the cover body, the pole passes through the first through hole and protrudes from the surface of the cover body.
[0006] In one embodiment, a second through hole is formed on the connecting sheet, and the pole passes through the second through hole and is riveted to the connecting sheet.
[0007] In one embodiment, the pole includes a column, a column cap and a column base, the column cap and the column base are respectively arranged at the two ends of the column along the height direction, and the radial diameters of the column cap and the column base are larger than the second through hole, so that the connecting plate is limited between the column cap and the column base.
[0008] In one embodiment, the connecting piece is an annular piece, and a first bending portion is provided on the connecting piece around the second through hole, the first bending portion is limited between the column cap and the column base, and the first bending portion is bent along the column base direction.
[0009] In one embodiment, the lengths of the column cap and the column base protruding from the column body in the radial direction are respectively greater than 1.5 mm.
[0010] In one embodiment, the first bent portion is accommodated in the first through hole, and a gap exists between a side wall of the first through hole and the first bent portion.
[0011] In one embodiment, the adhesive is an annular sheet structure, the adhesive is sleeved on the pole, the cover plate body is arranged on the adhesive, and the outer diameter of the adhesive is larger than the outer diameter of the connecting sheet, and the inner diameter of the adhesive is smaller than the diameter of the first through hole.
[0012] In one embodiment, the adhesive member is a hot-melt pressure-sensitive adhesive.
[0013] In one embodiment, the end surface of the cover body close to the battery core is bent inward to form a second bent portion, and the second bent portion is arranged around the first through hole.
[0014] The utility model also provides a battery comprising the battery cover plate, and the battery has the characteristics of good sealing and high safety.
[0015] Compared with the prior art, the utility model has at least the following advantages:
[0016] Compared with the existing battery cover, the battery cover provided by the utility model mainly designs the pole as a composite component, that is, the pole component includes a pole and a connecting piece, and the pole and the connecting piece are riveted, which can greatly increase the shear strength of the pole component and improve the battery safety and stability. At the same time, when conducting an adhesion test, it can avoid the problem that the actual adhesion cannot be measured when the adhesion is greater than the strength of the pole component itself. At the same time, the riveted structure can make the matching of the pole component more flexible, and the sizes of the pole and the connecting piece can be flexibly matched according to different battery designs, thereby improving the adaptability of the process design. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.
[0018] Figure 1 It is a schematic cross-sectional structure diagram of a battery cover according to one embodiment of the utility model.
[0019] Figure 2 It is a structural schematic diagram of a battery cover according to one embodiment of the utility model.
[0020] The numbers in the figure are: 10, battery cover; 100, cover body; 110, first through hole; 120, second bending portion; 200, adhesive; 300, pole assembly; 310, pole; 311, column; 312, column cap; 313, column seat; 320, connecting piece; 321, first bending portion. DETAILED DESCRIPTION
[0021] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the relevant drawings. The drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.
[0022] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.
[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific implementations and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.
[0024] See also Figure 1 and Figure 2 A battery cover 10 includes: a cover body 100, an adhesive 200 and a pole assembly 300, the pole assembly 300 includes a pole 310 and a connecting piece 320, the pole 310 and the connecting piece 320 are riveted, the cover body 100, the adhesive 200 and the connecting piece 320 are stacked, a first through hole 110 is opened on the cover body 100, and the pole 310 passes through the first through hole 110 and protrudes from the surface of the cover body 100.
[0025] It should be noted that the traditional pole 310 structure is an integrally formed single metal material. Especially in micro batteries, the connecting piece 320 of the pole 310 is relatively thin and has low mechanical strength. The battery cover 10 provided by the utility model mainly designs the pole 310 as a composite component, that is, the pole assembly 300 includes the pole 310 and the connecting piece 320, and the pole 310 and the connecting piece 320 are riveted. The riveted structure has good structural stability and greatly enhances the shear strength and compressive stress resistance compared to the integrally formed pole 310 structure. When performing an adhesion test, it can avoid the problem that the actual adhesion cannot be measured when the adhesion is greater than the strength of the pole assembly 300 itself; further, the riveted structure can make the pole assembly 300 more flexible to match, and the sizes of the pole 310 and the connecting piece 320 can be flexibly matched according to different battery designs to improve the adaptability of the process design.
[0026] The pole 310 and the connecting piece 320 in the pole assembly 300 can be made of the same or different metal conductive materials according to process requirements.
[0027] In one embodiment, the cover body 100 is mainly used for laser welding and sealing with the metal shell, and the pole assembly 300 is welded with the pole lug at one end of the battery cell. The cover body 100 and the pole assembly 300 are insulated and bonded by the adhesive 200.
[0028] See also Figure 1 and Figure 2 Furthermore, a second through hole is formed on the connecting piece 320 , and the pole 310 passes through the second through hole and is riveted to the connecting piece 320 .
[0029] Specifically, the pole 310 includes a column 311, a column cap 312 and a column base 313. The column cap 312 and the column base 313 are respectively arranged at both ends of the column 311 along the height direction, and the radial diameters of the column cap 312 and the column base 313 are both larger than the second through hole, so that the connecting piece 320 is limited between the column cap 312 and the column base 313.
[0030] It should be noted that the column 311, the column cap 312 and the column base 313 can be an integrally formed structure. After the riveting operation, the column 311, the column cap 312 and the column base 313 are an I-shaped structure as a whole. After riveting, the column cap 312 and the column base 313 protrude from the column base 313 and fit tightly with the connecting piece 320 to ensure the overall conductive stability of the pole assembly 300.
[0031] See also Figure 1 and Figure 2 Furthermore, the lengths of the column cap 312 and the column seat 313 protruding from the column body 311 in the radial direction are respectively greater than 1.5 mm. In this way, the connection stability and the conductive stability of the connecting piece 320 and the pole 310 are ensured.
[0032] See also Figure 1 and Figure 2 Furthermore, the connecting piece 320 is an annular piece, and a first bending portion 321 is arranged around the second through hole of the connecting piece 320 . The first bending portion 321 is limited between the column cap 312 and the column base 313 , and the first bending portion 321 is bent along the direction of the column base 313 .
[0033] See also Figure 1 and Figure 2 After the battery is assembled, the side of the connecting piece 320 close to the column seat 313 is connected to the winding core. The first bending portion 321 is provided mainly to increase the connection area between the connecting piece 320 and the pole 310. First, the sealing effect is enhanced to prevent the electrolyte from leaking from the connection part. Second, the conductive area is increased to enhance the conductive stability of the connecting piece 320 and the pole 310.
[0034] See also Figure 1 and Figure 2 Furthermore, the first bending portion 321 is accommodated in the first through hole 110 , and there is a gap between the side wall of the first through hole 110 and the first bending portion 321 .
[0035] It should be noted that the end of the pole 310 away from the connecting plate 320 passes through the first through hole 110 and protrudes from the cover body 100. The first bent portion 321 is arranged around the column 311. The diameter of the first through hole 110 should be larger than the outer circle size of the first bent portion 321, so that the pole 310 keeps a distance from the cover body 100 to avoid contact short circuit.
[0036] See also Figure 1 and Figure 2 Furthermore, the adhesive member 200 is an annular sheet structure, the adhesive member 200 is sleeved on the pole 310, the cover plate body 100 is arranged on the adhesive member 200, and the outer diameter of the adhesive member 200 is larger than the outer diameter of the connecting sheet 320, and the inner diameter of the adhesive member 200 is smaller than the diameter of the first through hole 110.
[0037] It should be noted that the cover body 100, the adhesive 200 and the connecting piece 320 are stacked in sequence. The main functions of the adhesive 200 are to assemble the cover body 100 and the pole assembly 300 into an integral structure by gluing, and to insulate the cover body 100 from the connecting piece 320. Therefore, the overall area of the adhesive 200 should be larger than the overlapping area of the cover body 100 and the connecting piece 320, so as to ensure the bonding stability and insulation effect.
[0038] See also Figure 1 and Figure 2 Furthermore, the adhesive member 200 is made of hot-melt pressure-sensitive adhesive.
[0039] It should be noted that hot melt pressure sensitive adhesive is a type of pressure sensitive adhesive, which is mainly a new type of adhesive tape made by mixing synthetic rubber, resin, rubber oil, etc., heating them into a molten state, and then coating them on a substrate such as cotton paper, cloth or plastic film. Among them, the connecting piece 320 and the pole 310 are first riveted to obtain an integrated pole assembly 300, and then the cover plate, the adhesive 200 and the pole assembly 300 are stacked and arranged, and the cover plate and the connecting piece 320 are bonded by hot pressing bonding. In this way, the preparation of the battery cover plate 10 is completed. The hot pressing bonding method has the advantages of simple process and high sealing.
[0040] See also Figure 1 and Figure 2 Furthermore, the end surface of the cover body 100 close to the battery cell is bent inward to form a second bent portion 120 , and the second bent portion 120 is arranged around the first through hole 110 .
[0041] It should be noted that the second bending portion 120 enables the cover body 100 to form a central area and an edge area, and the central area and the edge area have a height difference, wherein the connecting piece 320 and the adhesive 200 are both connected to the central area of the cover body 100. After the hot pressing operation, the adhesive 200 melts under the mutual hot pressing of the cover body 100 and the connecting piece 320. The second bending portion 120 can accommodate the overflow of the adhesive 200 to prevent the overflow from spreading to the edge area, thereby avoiding the overflow from affecting the laser sealing welding of the battery cover 10 and the shell.
[0042] The utility model also provides a battery including the battery cover 10, which has the characteristics of good sealing and high safety. The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as a limitation on the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several deformations and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.
Claims
1. A battery cover, characterized in that: include: A cover body, an adhesive and a pole assembly, wherein the pole assembly comprises a pole and a connecting piece, wherein the pole is riveted to the connecting piece, the cover body, the adhesive and the connecting piece are stacked, a first through hole is opened on the cover body, and the pole passes through the first through hole and protrudes from the surface of the cover body.
2. The battery cover according to claim 1, characterized in that: The connecting sheet is provided with a second through hole, and the pole passes through the second through hole and is riveted to the connecting sheet.
3. The battery cover according to claim 2, characterized in that: The pole includes a column, a column cap and a column seat, the column cap and the column seat are respectively arranged at both ends of the column along the height direction, and the radial diameters of the column cap and the column seat are larger than the second through hole, so that the connecting piece is limited between the column cap and the column seat.
4. The battery cover according to claim 3, characterized in that: The connecting piece is an annular piece, and a first bending portion is arranged around the second through hole. The first bending portion is limited between the column cap and the column base, and the first bending portion is bent along the column base direction.
5. The battery cover according to claim 3, characterized in that: The lengths of the column cap and the column seat protruding from the column body in the radial direction are respectively greater than 1.5 mm.
6. The battery cover according to claim 4, characterized in that: The first bending portion is accommodated in the first through hole, and there is a gap between the side wall of the first through hole and the first bending portion.
7. The battery cover according to claim 4, characterized in that: The adhesive member is an annular sheet structure, the adhesive member is sleeved on the pole, the cover plate body is arranged on the adhesive member, and the outer diameter of the adhesive member is larger than the outer diameter of the connecting sheet, and the inner diameter of the adhesive member is smaller than the diameter of the first through hole.
8. The battery cover according to claim 7, characterized in that: The bonding piece adopts hot-melt pressure-sensitive adhesive.
9. The battery cover according to claim 1, characterized in that: The end surface of the cover body close to the battery core is bent inward to form a second bent portion, and the second bent portion is arranged around the first through hole.
10. A battery, characterized in that: A battery cover comprising the battery cover according to any one of claims 1 to 9.