Single battery and battery pack
By introducing insulating parts and insulating fillers into the cover assembly of the single cell, the problems of reduced connection area and assembly gap caused by the folded edge of the top cover patch are solved, a higher protection level and overcurrent capacity are achieved, and the safety and stability of the battery are ensured.
Patent Information
- Application Number
- CN202422730072.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-08
- Publication Date
- 2025-10-10
- Estimated Expiration
- 2034-11-08
AI Technical Summary
The folded edge structure of the top cover patch reduces the connection area between the top of the pole and the busbar, affecting the current carrying capacity. There is also an assembly gap that is prone to accumulation of dust and conductive foreign matter, leading to the risk of short circuit of the single battery.
A cover plate assembly is designed, including a top cover body, a pole, an insulating part and a top cover patch. The insulating part is clamped between the pole and the top cover body, the top cover patch covers the assembly gap, and the gap is filled with an insulating filler, eliminating the folded edge structure to ensure insulation and overcurrent capacity.
It improves the protection level of the single battery, prevents dust and conductive foreign matter from entering the gap, ensures the reliable connection between the pole and the top cover, and enhances the flow capacity and sealing.
Smart Images
Figure CN223427588U_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the field of battery technology, and specifically relates to a single cell and a battery pack. Background Art
[0002] The insulating structure on the battery top cover is generally used to separate the pole from the top cover body, providing insulation and preventing electrical connection between the pole and the top cover body. The top cover patch attached to the top cover body is generally used for insulation and dust protection. However, to avoid assembly gaps between the insulating structure and the pole, the top of the top cover patch forms a folded edge connecting to the top of the pole, which reduces the connection area between the top of the pole and the busbar, affecting the current carrying capacity. Utility Model Content
[0003] Purpose of the utility model: An embodiment of the present application provides a single cell battery, aiming to overcome the technical problem of the current top cover patch affecting the connection area between the top of the pole and the busbar; another purpose of the embodiment of the present application is to provide a battery pack.
[0004] Technical solution: The embodiment of the present application provides a single battery, comprising: a cover plate assembly and an electrode assembly, wherein the electrode assembly is arranged on one side of the cover plate assembly along the thickness direction;
[0005] The cover plate assembly comprises:
[0006] The top cover body has an assembly hole;
[0007] A pole, passing through the assembly hole and connected to the top cover body;
[0008] an insulating member, disposed on a side of the top cover body away from the electrode assembly along the thickness direction, and sandwiched between the electrode column and the top cover body;
[0009] The top cover patch includes a main body and a convex portion connected to each other. The main body is connected to the side of the top cover body away from the electrode assembly. The convex portion protrudes relative to the main body in a direction away from the top cover body and surrounds the outer peripheral wall of the pole.
[0010] In some embodiments, there is a gap between the protrusion and the pole, and the cover assembly further includes an insulating filler, which fills the gap and connects the protrusion and the pole.
[0011] In some embodiments, the protrusion has a first size a mm, satisfying: 0.1≤a≤0.5.
[0012] In some embodiments, the main body and the protrusion are integrally formed.
[0013] In some embodiments, a chamfer is provided on a side of the protrusion facing away from the main body, and the chamfer is arranged toward the pole.
[0014] In some embodiments, a first sinking groove is formed on a side of the top cover body facing away from the electrode assembly, and the first sinking groove is connected to the assembly hole;
[0015] The insulating member is received in the first sinking groove and is respectively connected to the pole and the top cover body.
[0016] In some embodiments, a second recessed groove is formed on an outer edge of the pole facing the top cover body, and the second recessed groove is connected to the first recessed groove;
[0017] The insulating member includes a first section and a second section connected to each other. The first section is disposed in the first sinking groove, and the second section is disposed in the second sinking groove.
[0018] In some embodiments, the protrusion is connected to the insulating member.
[0019] In some embodiments, along the thickness direction, the maximum distance between the protrusion and the top cover body is H1, and the maximum distance between the insulating member and the top cover body is H2, satisfying H1>H2.
[0020] The present application also discloses a battery pack, comprising the single battery as described in the above embodiment.
[0021] Beneficial effects: The single cell in the embodiment of the present application includes a cover plate assembly and an electrode assembly, wherein the electrode assembly is arranged on one side of the cover plate assembly along the thickness direction; the cover plate assembly includes: a top cover body, a pole, an insulating member, and a top cover patch; the top cover body has an assembly hole; the pole is provided with the assembly hole and is connected to the top cover body; the insulating member is arranged on the side of the top cover body away from the electrode assembly along the thickness direction and is sandwiched between the pole and the top cover body; the top cover patch includes a connected main body and a protrusion, the main body is connected to the side of the top cover body away from the electrode assembly, the protrusion protrudes relative to the main body in a direction away from the top cover body, and surrounds the outer peripheral wall of the connected pole. By sandwiching the insulating member between the pole and the top cover body, and using the top cover patch to stick to the side of the top cover body away from the electrode assembly and the outer peripheral wall of the pole to cover the assembly gap between the insulating member and the pole, the protection level is improved, and the influence of the top cover patch on the overcurrent capacity of the pole can be avoided.
[0022] The present application also discloses a battery pack including the single cell described in the above embodiment. Therefore, the battery pack can have all the technical features and effects of the above single cell, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.
[0024] Figure 1 This is a schematic diagram of an explosion of a single cell according to an embodiment of the present application, and only part of the single cell is shown in the figure;
[0025] Figure 2 This is a schematic diagram of the three-dimensional structure of the cover plate assembly in the single cell of the embodiment of the present application;
[0026] Figure 3 This is a schematic diagram of the top structure of the top cover patch in the single cell of the embodiment of the present application;
[0027] Figure 4 for Figure 3 Schematic cross-sectional view in the AA direction;
[0028] Figure 5 This is a schematic top view of the structure of the cover plate assembly in the single cell of the embodiment of the present application;
[0029] Figure 6 for Figure 5 Schematic cross-sectional view in the middle BB direction;
[0030] Figure 7 is a schematic cross-sectional view of the cover plate assembly along the BB direction in another embodiment, in which the insulating filler is schematically shown;
[0031] Figure numerals: 1, cover plate assembly; 2, electrode assembly; X, thickness direction; 11, top cover body; 12, pole; 13, insulating part; 14, top cover patch; 141, main body; 142, convex portion; 121, outer peripheral wall; 15, insulating filler; 1421, chamfer; 111, first groove; 122, second groove; 131, first section; 132, second section. DETAILED DESCRIPTION
[0032] The following will be combined with the accompanying drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making any creative work are within the scope of protection of this application.
[0033] In the description of the present application, it should be understood that the terms "upper", "lower", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, "multiple" means two or more, and at least one means one, two or more, unless otherwise clearly defined. Terms such as "first", "second", and "third" are simply names for parts or embodiments for the convenience of description, and do not imply that there is an order of importance between parts or embodiments.
[0034] It should also be noted that in the drawings of the present application, the arrow marked X is used to indicate the thickness direction of the cover assembly. In the description of the present application, the thickness direction is introduced to more clearly define the structure and relative position relationship of the cover assembly, single cells and components in the battery pack.
[0035] As a preface to the embodiments of this application, the insulating structure on the battery top cover is generally used to separate the pole from the top cover body, providing insulation and preventing electrical connection between the pole and the top cover body. The top cover patch attached to the top cover body is generally used for insulation and dust protection. However, to avoid an assembly gap between the insulating member and the pole, the top of the top cover patch forms a folded edge connecting to the top of the pole, which reduces the connection area between the top of the pole and the busbar, affecting the current carrying capacity.
[0036] In view of this, an embodiment of the present application provides a single cell battery, aiming to solve at least one of the above-mentioned technical problems.
[0037] See also Figures 1 to 7 As shown, the single cell of the embodiment of the present application includes: a cover assembly 1 and an electrode assembly 2, and the electrode assembly 2 is arranged on one side of the cover assembly 1 along the thickness direction X; it should be understood that the single cell also includes a shell, and the shell has a connected receiving cavity and an opening for assembling and receiving the electrode assembly 2, and the cover assembly 1 is used to seal the opening of the shell to ensure the sealing of the shell, and the cover assembly 1 is used to guide the current of the electrode assembly 2 to the outside of the shell or to guide the external current into the electrode assembly 2 for storage.
[0038] Specifically, the cover plate assembly 1 includes: a top cover body 11, a pole 12, an insulating member 13 and a top cover patch 14; wherein, the top cover body 11 has an assembly hole; the pole 12 is provided with the assembly hole and is connected to the top cover body 11; the insulating member 13 is arranged on the side of the top cover body 11 away from the electrode assembly 2 along the thickness direction X, and is clamped between the pole 12 and the top cover body 11; the top cover patch 14 includes a connected main body 141 and a convex portion 142, the main body 141 is connected to the side of the top cover body 11 away from the electrode assembly 2, and the convex portion 142 protrudes relative to the main body 141 in the direction away from the top cover body 11, and surrounds the outer peripheral wall 121 connected to the pole 12. It should be understood that the insulating member 13 is generally the upper plastic structure in the single cell, which is mainly used to insulate and connect the pole 12 and the top cover body 11; the top cover patch 14 is made of insulating material, which is mainly used to insulate and protect the exposed parts of the pole 12 and the top cover body 11, so as to solve the problem that the conductive medium in the actual production process or the use environment can easily connect the pole 12 and the top cover body 11, thereby preventing the single cell from short-circuiting and failing. The present application improves the protection level by sandwiching the insulating member 13 between the pole 12 and the top cover body 11, and using the top cover patch 14 to stick to the side of the top cover body 11 away from the electrode assembly 2 and the outer wall 121 of the pole 12 to cover the assembly gap between the insulating member 13 and the pole 12, thereby preventing dust and other conductive foreign matter from falling into the assembly gap between the insulating member 13 and the pole 12. At the same time, the folded edge structure of the top cover patch 14 is eliminated, thereby ensuring the current capacity of the pole 12.
[0039] See also Figure 7 As shown, in some embodiments, there is a gap between the protrusion 142 and the pole 12, and the cover assembly 1 further includes an insulating filler 15, which fills the gap and connects the protrusion 142 and the pole 12. It should be understood that the insulating filler 15 can be made of polypropylene, polyethylene, polyimide or silicone. By filling the insulating filler 15 between the protrusion 142 and the pole 12, the reliability of the connection between the top cover patch 14 and the pole 12 is ensured, which can avoid the assembly gap between the top cover patch 14 and the pole 12, and at the same time, it can avoid the protrusion 142 from falling off or tearing due to improper operation or other factors.
[0040] See also Figure 6As shown, in some embodiments, the protrusion 142 has a first dimension a mm, satisfying: 0.1≤a≤0.5. It should be understood that the first dimension a of the protrusion 142 is between 0.1mm and 0.5mm, and specifically, can be any value among 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, or a range between any two values. The first dimension a can be understood as the spacing dimension between the inner wall and the outer wall of the protrusion 142 in the radial direction. By setting the first dimension a of the protrusion 142 to meet the above range, the top cover patch 14 is ensured to meet certain insulation and pressure resistance requirements, and the protrusion 142 is prevented from deformation or damage during assembly or use, which may affect the insulation and safety of the single battery.
[0041] See also Figure 1 、 Figure 3 and Figure 4 As shown, in some embodiments, the main body 141 and the protrusion 142 are integrally formed to reduce the production and assembly steps of the cover plate assembly 1 and lower costs. In some embodiments, the protrusion 142 has a chamfer 1421 on the side facing away from the main body 141, with the chamfer 1421 facing the terminal 12. The chamfer 1421 serves to guide the terminal 12 as it moves through the assembly hole, reducing the difficulty of installing the terminal 12.
[0042] See also Figure 6 and Figure 7 As shown, in some embodiments, a first recessed groove 111 is defined on the side of the top cover body 11 facing away from the electrode assembly 2. The first recessed groove 111 communicates with the assembly hole. The insulating member 13 is received in the first recessed groove 111 and connects the electrode post 12 and the top cover body 11, respectively. It should be understood that by defining the first recessed groove 111 in the top cover body 11 and communicating with the assembly hole, the insulating member 13 is accommodated in the first recessed groove 111. While ensuring the insulated assembly between the electrode post 12 and the top cover body 11, the height of the cover assembly 1 is reduced, thereby improving space utilization.
[0043] See also Figure 6 and Figure 7As shown, in some embodiments, a second recessed groove 122 is provided on the outer edge of the pole 12 on the side facing the top cover body 11, and the second recessed groove 122 is connected to the first recessed groove 111; the insulating member 13 includes a first section 131 and a second section connected to each other, the first section 131 is arranged in the first recessed groove 111, and the second section is arranged in the second recessed groove 122. It should be understood that by providing the second recessed groove 122 on the pole 12 and the second recessed groove 122 being connected to the first recessed groove 111, the first section 131 and the second section of the insulating member 13 form a structure similar to an L-shape. Among them, the first section 131 extends along the thickness direction X and is connected to the pole 12, and the second section extends along a direction perpendicular to the thickness of the cover assembly 1 and connects the pole 12 and the top cover body 11, thereby being able to cover the portion of the pole 12 exposed outside the top cover body 11, thereby achieving insulation protection between the pole 12 and the top cover body 11. At the same time, the gap created by the assembly between the insulating member 13 and the pole 12 is located within the second recessed groove 122. The top cover patch 14, while being attached to and connected to the top cover body 11 and the pole 12, can cover the assembly gap between the insulating member 13 and the pole 12, thereby improving the level of protection and preventing dust and other conductive foreign matter from falling into the assembly gap between the insulating member 13 and the pole 12. Furthermore, the insulating member 13 is partially accommodated within the second recessed groove 122, facilitating the attachment of the top cover patch 14 to the outer peripheral wall 121 of the pole 12, and preventing the insulating member 13 from protruding and affecting the stability and sealing of the connection between the top cover patch 14 and the pole 12.
[0044] See also Figure 6 and Figure 7 As shown, in some embodiments, the protrusion 142 is connected to the insulating member 13. It should be understood that the protrusion 142 of the top cover patch 14 can be connected to the insulating member 13 in a portion near the top cover body 11 while being connected to the pole 12. This improves the connection strength and deformation resistance of the top cover patch 14, further improving the sealing and stability of the top cover patch 14; at the same time, it facilitates the rapid installation of the top cover patch 14, improving assembly efficiency.
[0045] See also Figure 6 As shown, in some embodiments, along the thickness direction X, the maximum distance between the protrusion 142 and the top cover body 11 is H1, and the maximum distance between the insulating member 13 and the top cover body 11 is H2, satisfying H1>H2. It should be understood that the distance between the protrusion 142 and the top cover body 11 is much larger than the maximum distance between the insulating member 13 and the top cover body 11, further improving the protective height of the top cover patch 14 and ensuring the sealing reliability between the top cover patch 14 and the pole 12. It should be understood that the distance between the protrusion 142 and the top cover body 11 can be equal to the distance between the pole 12 and the top cover body 11.
[0046] The embodiments of the present application also disclose a battery pack, including a single cell as in the above embodiment. Therefore, it can have all the technical features and technical effects of the above single cells, which will not be repeated here. The battery pack is a whole composed of a plurality of single cells, and generally includes components such as battery cells, a battery management system (BMS), a connector, and a protective casing. Its main function is to provide higher voltage, capacity, and energy density to meet the needs of various applications. Battery packs are commonly used in electric vehicles, drones, portable electronic devices, energy storage systems, emergency power supplies and other fields.
[0047] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.
[0048] The above is a detailed introduction to a single cell and a battery pack provided in the embodiments of the present application, and specific examples are used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application; ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A single battery, characterized in that: include: A cover plate assembly and an electrode assembly, wherein the electrode assembly is arranged on one side of the cover plate assembly along the thickness direction; The cover plate assembly comprises: The top cover body has an assembly hole; A pole, passing through the assembly hole and connected to the top cover body; an insulating member, disposed on a side of the top cover body away from the electrode assembly along the thickness direction, and sandwiched between the electrode column and the top cover body; The top cover patch includes a main body and a convex portion connected to each other. The main body is connected to the side of the top cover body away from the electrode assembly. The convex portion protrudes relative to the main body in a direction away from the top cover body and surrounds the outer peripheral wall of the pole.
2. The single cell according to claim 1, characterized in that: There is a gap between the protrusion and the pole, and the cover plate assembly further includes an insulating filler, which fills the gap and connects the protrusion and the pole.
3. The single cell according to claim 1, characterized in that: The convex portion has a first size a mm, which satisfies: 0.1≤a≤0.
5.
4. The single cell according to claim 1, characterized in that: The main body and the convex portion are integrally formed.
5. The single cell according to claim 1, characterized in that: A chamfer is provided on a side of the convex portion away from the main body portion, and the chamfer is arranged toward the pole.
6. The single cell according to claim 1, characterized in that: A first sinking groove is formed on a side of the top cover body away from the electrode assembly, and the first sinking groove is connected to the assembly hole; The insulating member is received in the first sinking groove and is respectively connected to the pole and the top cover body.
7. The single cell according to claim 6, characterized in that: A second recessed groove is formed on the outer edge of the pole facing the top cover body, and the second recessed groove is connected to the first recessed groove; The insulating member includes a first section and a second section connected to each other. The first section is disposed in the first sinking groove, and the second section is disposed in the second sinking groove.
8. The single cell according to claim 7, characterized in that: The protrusion is connected to the insulating member.
9. The single cell according to claim 8, characterized in that: Along the thickness direction, the maximum distance between the protrusion and the top cover body is H1, and the maximum distance between the insulating member and the top cover body is H2, satisfying H1>H2.
10. A battery pack, characterized in that: The method comprises the single cell according to any one of claims 1 to 9.