Battery cell and electric equipment
By placing an insulating material layer on the positive electrode of the battery cell, the short circuit problem caused by the contact between the positive electrode of the battery cell and the shell is solved, and the safety and service life of the battery cell are improved.
Patent Information
- Application Number
- CN202420438720.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-06
- Publication Date
- 2025-04-15
- Estimated Expiration
- 2034-03-06
AI Technical Summary
The positive electrode ear of the buckle battery cell is easily contacted with the inner wall of the battery case, resulting in short circuit inside the battery cell, posing safety hazards and short service life.
A battery cell is designed in which at least part of the positive electrode ear is provided with an insulating material layer that is used to prevent the positive electrode ear from contacting the housing and/or the cover body, thereby avoiding overlap and short circuit.
It effectively avoids contact between the positive electrode ear and the housing and/or the cover body, prevents short circuit inside the battery cell, and improves the safety and service life of the battery cell.
Smart Images
Figure CN222763136U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of new energy technology, and in particular to battery cells and electrical equipment. Background Art
[0002] Internal short circuit of a battery usually refers to a short circuit that occurs inside the battery. When a short circuit occurs in a battery, the battery will continue to release heat. If the heat cannot be dissipated in time, it will burn out electrical appliances and may also cause fires or even explosions, seriously threatening property and life safety.
[0003] In the related art, the positive electrode tabs of some button-type batteries can easily come into contact with the inner wall of the battery casing, causing a short circuit inside the battery. Utility Model Content
[0004] In order to solve or partially solve the problems existing in the related art, the present application provides a battery cell and an electrical device, which can avoid the phenomenon of internal short circuit of the battery cell caused by overlapping between the positive electrode ear and the shell and / or the inner wall of the cover assembly, thereby improving the safety and service life of the battery cell.
[0005] The first aspect of the present application provides a battery cell, comprising:
[0006] A shell and a cover assembly mounted on the shell, the cover assembly comprising a positive pole and a cover body, the cover body being provided with a positive pole through hole, the positive pole being located in the positive pole through hole and being insulated and connected to the cover body, the shell being used to accommodate a winding core; the winding core is provided with a positive pole tab and a negative pole tab, the negative pole tab being connected to the shell, and the positive pole tab being connected to the positive pole;
[0007] Wherein, at least a portion of the positive electrode tab is wrapped with an insulating material layer, and the insulating material layer is used to prevent the positive electrode tab from contacting the shell and / or the cover body.
[0008] In one embodiment, the positive electrode tab includes a first connection end and a second connection end, the first connection end is connected to the side of the winding core away from the central axis, and the second connection end is connected to the positive electrode column; the insulating material layer is wound around the positive electrode tab at a position close to the first connection end.
[0009] In one embodiment, the cover plate body is a metal ring, the positive electrode column is provided with a flange edge, the flange edge is bonded to the inner wall of the metal ring by an adhesive material, and the outer edge of the metal ring is connected to the opening of the shell;
[0010] The positive electrode tab is accommodated in a gap between the winding core and the metal ring, and at least a portion of the insulating material layer overlaps with the flange edge in an extending direction of the central axis of the winding core.
[0011] In one embodiment, the spacing of the gaps is ≥ 0.2 mm.
[0012] In one embodiment, the radius of the flange edge is 3-6 mm.
[0013] In one embodiment, the overlapping width between the insulating material layer and the flange edge is ≥1 mm.
[0014] In one embodiment, the width of the insulating material layer in the length direction of the positive electrode tab is 2-5 mm.
[0015] In one embodiment, the thickness of the insulating material layer is 0.012-0.025 mm.
[0016] In one embodiment, the insulating material layer is a tape wrapped around the outer periphery of the positive electrode tab.
[0017] A second aspect of the present application provides an electrical device, comprising the battery cell as described in the first aspect above.
[0018] The technical solution provided by this application may have the following beneficial effects:
[0019] In the battery cell provided in the present application, at least a portion of the positive electrode tab is wrapped with an insulating material layer, and the insulating material layer is used to prevent the positive electrode tab from contacting the shell and / or the cover body, thereby avoiding the phenomenon of overlapping between the positive electrode tab and the shell and / or the inner wall of the cover body to cause internal short circuit of the battery, which can improve the safety and service life of the battery.
[0020] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] The above and other objects, features and advantages of the present application will become more apparent through a more detailed description of exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.
[0022] Figure 1 It is a schematic diagram of the structure of a battery cell shown in an embodiment of the present application.
[0023] Figure 2 yes Figure 1 A partial enlarged schematic diagram of a battery cell shown in the embodiment.
[0024] Figure numerals: 100, shell; 101, cover plate assembly; 112, positive electrode column; 122, cover plate body; 132, adhesive material; 1121, flange edge; 200, winding core; 201, positive electrode tab; 202, negative electrode tab; 211, insulating material layer. DETAILED DESCRIPTION
[0025] The preferred embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.
[0026] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.
[0027] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.
[0028] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.
[0029] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0030] In the related art, in some button-type batteries, especially batteries with a three-piece composite structure in which the central pole is convex, the positive electrode ear can easily overlap with the inner wall of the battery shell, causing an internal short circuit in the battery cell. In view of the above problem, the embodiment of the present application provides a battery cell, which can avoid the phenomenon of internal short circuit in the battery cell caused by overlapping between the positive electrode ear and the shell and / or the cover body, thereby improving the safety and service life of the battery cell.
[0031] The technical solution of the embodiments of the present application is described in detail below with reference to the accompanying drawings.
[0032] Figure 1 is a schematic diagram of the structure of a battery cell shown in an embodiment of the present application; Figure 2 yes Figure 1 A partial enlarged schematic diagram of a battery cell shown in the embodiment.
[0033] See also Figure 1 and Figure 2 The battery cell provided in the present application includes a shell 100 and a cover assembly 101 installed on the shell 100, the cover assembly 101 includes a positive electrode column 112 and a cover body 122, the cover body 122 is provided with a positive electrode column through hole, the positive electrode column 112 is located in the positive electrode column through hole, and is insulated and connected to the cover body 122, the positive electrode column 112 can be arranged along the central axis of the battery cell, and the shell 100 is used to accommodate a winding core 200; the winding core 200 leads to a positive electrode tab 201 and a negative electrode tab 202, the negative electrode tab 202 is connected to the shell 100, and the positive electrode tab 201 is connected to the positive electrode column 112; wherein, at least a portion of the positive electrode tab 201 is wrapped with an insulating material layer 211, and the insulating material layer 211 is used to prevent the positive electrode tab 201 from contacting the shell 100 and / or the cover body 122.
[0034] The battery cell provided in the present application has an insulating material layer 211 wrapped around at least a portion of the positive electrode tab 201 close to the inner wall of the shell 100. The insulating material layer 211 can prevent the positive electrode tab 201 from contacting the inner wall of the shell 100 and / or the cover body 122. Therefore, it is possible to avoid the phenomenon of overlapping between the positive electrode tab 201 and the inner wall of the shell 100 and / or the cover body 122 to cause a short circuit, which can improve the safety and service life of the battery.
[0035] In some embodiments, the positive electrode tab 201 includes a first connection end and a second connection end, the first connection end is connected to the side of the winding core 200 away from the central axis, and the second connection end is connected to the positive electrode column 112; the insulating material layer 211 is wound around the positive electrode tab 201 at a position close to the first connection end. Since the first connection end is far away from the positive electrode column 112 and close to the negative electrode region, the insulating material layer 211 is provided at the first connection end to effectively prevent the positive electrode tab 201 from contacting the negative electrode region and causing a short circuit.
[0036] See also Figure 1 and Figure 2 In some embodiments, the cover body 122 is a metal ring, and the positive electrode column 112 is provided with a flange edge 1121. The positive electrode column 112 and the flange edge 1121 can be a conductive integrated structure. The positive electrode column 112 passes through the column through hole of the metal ring, and the flange edge 1121 and the metal ring are connected by an adhesive material 132. The adhesive material 132 can be an insulating glue layer; the outer edge of the metal ring is connected to the opening of the shell 100; the positive electrode ear 201 is accommodated in the gap between the winding core 200 and the metal ring.
[0037] The winding core 200 is provided with an upper end surface and a lower end surface, the positive electrode tab 201 is provided between the upper end surface of the winding core 200 and the cover plate assembly 101, and at least a portion of the insulating material layer 211 overlaps with the flange edge 1121 in the extension direction of the central axis. After such a configuration, it is ensured that the outer surface of the positive electrode tab 201 is not exposed in the area outside the flange edge 1121, thereby preventing the positive electrode tab 201 from contacting the metal ring and causing a short circuit.
[0038] The metal ring of this embodiment can be a steel ring, the outer edge of the metal ring is connected to the opening of the shell 100, and together with the shell 100, it is the negative electrode of the battery cell. The metal ring and the positive electrode column 112 are insulated by the adhesive material 132.
[0039] In this embodiment, the positive electrode tab 201 and the negative electrode tab 202 are respectively led out from the two sides of the winding core 200, the positive electrode tab 201 is located on the side close to the cover plate, and the negative electrode tab 202 is located on the side away from the cover plate. The negative electrode tab 202 is welded to the inner wall of the shell 100, and the positive electrode tab 201 is welded to the positive electrode column 112, for example, by laser welding, resistance welding, ultrasonic welding, etc.
[0040] In this embodiment, the positive electrode tab 201 is straight, the upper end surface of the winding core 200 is parallel to the cover plate, and there is a gap of a set size between the upper end surface of the winding core 200 and the cover plate body 122, and the positive electrode tab 201 is located in the gap. The positive electrode tab 201 is obliquely connected between the side of the winding core 200 away from the central axis and the positive electrode column 112, and the negative electrode tab 202 is obliquely connected between the side of the winding core 200 away from the central axis and the bottom inner wall of the shell 100.
[0041] See also Figure 1 and Figure 2 In some embodiments, the spacing b between the first connection end of the positive electrode tab 201 and the cover body 122 is ≥ 0.2 mm, ensuring that the insulating material layer 211 is not crushed during the installation of the cover assembly 101, thereby exposing the surface of the tab.
[0042] The positive electrode column 112 and the flange edge 1121 are arranged coaxially, and the second end of the positive electrode ear 201 is connected to the axis of the positive electrode column 112 on the inner side of the battery cell. The radius R of the flange edge 1121 can be 3-6mm, and the overlapping width a of the insulating material layer 211 and the flange edge 1121 is ≥1mm, which can further prevent the outer surface of the positive electrode ear 201 from being exposed to the negative electrode part.
[0043] In some embodiments, the thickness of the insulating material layer 211 is 0.012-0.025 mm, and the coating width c of the insulating material layer 211 in the length direction of the positive electrode tab 201 is 2-5 mm, which can further improve the insulation performance.
[0044] In some embodiments, the insulating material layer 211 is a tape wrapped around the periphery of the positive electrode tab 201. The tape is wrapped around the periphery of the positive electrode tab 201 in the form of a rubber wrap. It is worth noting that the tape of the present application is not a sticking tape. Compared with the sticking tape, the tape of the present application is not prone to failure and has higher insulation stability.
[0045] It can be seen from the above embodiments that the battery cell provided in the present application can prevent the positive electrode tab 201 from contacting the shell 100 and / or the cover body 122, thereby avoiding the phenomenon of overlapping between the positive electrode tab 201 and the shell 100 and / or the cover body 122 to cause a short circuit, thereby improving the safety and service life of the battery.
[0046] In some embodiments, the assembly process of the battery cell of this embodiment is as follows: 1. The cover body 122 and the positive electrode post 112 are combined to form a cover assembly 101, for example, they can be hot-pressed and composited by an adhesive material 132; 2. An insulating material layer 211 is wound around the positive electrode tab 201 of the winding core 200, and then the positive electrode tab 201 is welded to the pole, and the negative electrode tab 202 is welded to the shell 100; 3. The battery cell of the assembled winding core 200 is baked, and after baking, the electrolyte is injected into the shell 100; 4. After the injection is completed, the cover assembly 101 is welded to the shell 100, so that a sealed environment is formed in the shell 100.
[0047] Accordingly, the present application also provides an electrical device, which includes the above battery cell, so that the short circuit phenomenon caused by the contact between the positive electrode tab 201 inside the battery cell and the negative electrode shell 100 can be avoided, and the safety of the electrical device can be improved. The electrical device includes but is not limited to electronic products powered by the above battery cell, such as clocks, toys, smart door locks, security cameras, flashlights and other devices, but is not limited to this, as long as it is an electronic product containing the battery cell of the present application, it should be included.
[0048] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.
Claims
1. A battery cell, characterized in that: include: A shell and a cover assembly mounted on the shell, the cover assembly comprising a positive pole and a cover body, the cover body being provided with a positive pole through hole, the positive pole being located in the positive pole through hole and being insulated and connected to the cover body, the shell being used to accommodate a winding core; the winding core is provided with a positive pole tab and a negative pole tab, the negative pole tab being connected to the shell, and the positive pole tab being connected to the positive pole; Wherein, at least a portion of the positive electrode tab is wrapped with an insulating material layer, and the insulating material layer is used to prevent the positive electrode tab from contacting the shell and / or the cover body.
2. The battery cell according to claim 1, characterized in that: The positive electrode tab includes a first connection end and a second connection end, the first connection end is connected to the side of the winding core away from the central axis, and the second connection end is connected to the positive electrode column; the insulating material layer is wound around the positive electrode tab at a position close to the first connection end.
3. The battery cell according to claim 1, characterized in that: The cover body is a metal ring, the positive electrode column is provided with a flange edge, the flange edge is joined to the inner wall of the metal ring by an adhesive material, and the outer edge of the metal ring is connected to the opening of the shell; The positive electrode tab is accommodated in a gap between the winding core and the metal ring, and at least a portion of the insulating material layer overlaps with the flange edge in an extending direction of the central axis of the winding core.
4. The battery cell according to claim 3, characterized in that: The spacing of the gap is ≥0.2 mm.
5. The battery cell according to claim 3, characterized in that: The radius of the flange edge is 3-6 mm.
6. The battery cell according to claim 3, characterized in that: The overlapping width between the insulating material layer and the flange edge is ≥1 mm.
7. The battery cell according to any one of claims 1 to 6, characterized in that: The width of the insulating material layer in the length direction of the positive electrode tab is 2-5 mm.
8. The battery cell according to any one of claims 1 to 6, characterized in that: The thickness of the insulating material layer is 0.012-0.025 mm.
9. The battery cell according to claim 1, characterized in that: The insulating material layer is adhesive tape wrapped around the outer periphery of the positive electrode tab.
10. An electrical equipment, characterized in that: Comprising the battery cell as described in any one of claims 1 to 9.