Battery cover plate and battery monomer
By setting symmetrical first and second notches on the battery cover, bidirectional symmetrical explosion of the battery is achieved, which solves the problems of poor battery safety and stability, improves production efficiency and reduces costs.
Patent Information
- Application Number
- CN202422499562.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-16
- Publication Date
- 2025-09-30
- Estimated Expiration
- 2034-10-16
AI Technical Summary
The asymmetric scoring structure of the explosion-proof plate of the existing battery cover leads to poor battery safety and stability, low production efficiency and high cost.
A symmetrical first notch and a second notch are provided on the battery cover. The first notch and the second notch are symmetrical about the center line, thereby achieving bidirectional symmetrical blasting, reducing the probability of different blasting values of multiple explosion-proof disks, and simplifying the assembly process.
The safety and stability of battery cells are improved, production efficiency is increased, and production costs are reduced.
Smart Images
Figure CN223401738U_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 monomer. Background Art
[0002] To improve battery safety, battery cover panels are often equipped with explosion-proof plates. When the battery experiences an abnormal internal pressure surge, the notches on the plates break, allowing the high-pressure gas inside to escape through the fractured notch, preventing explosion.
[0003] Common explosion-proof discs feature a single-sided notch structure, meaning they are scored only on one side of the disc across the width of the battery cover, leaving the other half unscored. Due to the uneven pressure distribution within the battery, the position of the notch across the width of the battery cover can lead to varying burst values, compromising battery safety and stability.
[0004] If the explosion value of the explosion-proof disk is to be kept the same in the same batch of battery products, it is necessary to distinguish the position of the notch manually or by CCD recognition equipment when assembling the explosion-proof disk and the battery cover, which is not conducive to improving production efficiency and reducing production costs.
[0005] Therefore, it is urgent to propose a battery cover and a battery cell to solve the above technical problems. Utility Model Content
[0006] The first object of the present utility model is to provide a battery cover plate, which has the effect of improving the safety and stability of battery cells and is conducive to improving production efficiency and reducing production costs.
[0007] To achieve this purpose, the present invention adopts the following technical solutions:
[0008] Battery cover, including:
[0009] Cover plate body;
[0010] The explosion-proof plate is arranged on the cover body, and a first notch and a second notch are provided on the explosion-proof plate. The first notch and the second notch are symmetrically arranged about a first center line, and the first center line is parallel to the width direction of the cover body.
[0011] Optionally, the first notch includes two first sub-notches, the second notch includes two second sub-notches, and each first sub-notch is symmetrically arranged with respect to a corresponding second sub-notch about the first center line.
[0012] Optionally, the two first sub-scores are symmetrically arranged about the second center line, and the two second sub-scores are symmetrically arranged about the second center line, and the second center line is parallel to the length direction of the cover body.
[0013] Optionally, the first notch further includes a third sub-notch, the second notch further includes a fourth sub-notch, the third sub-notch and the fourth sub-notch are symmetrically arranged about the first center line, the two ends of the third sub-notch are respectively connected to a corresponding one of the first sub-notches, and the two ends of the fourth sub-notch are respectively connected to a corresponding one of the second sub-notches.
[0014] Optionally, the third sub-score and the fourth sub-score are both arc-shaped, and the third sub-score and the fourth sub-score are both bent in directions away from each other, and the two first sub-scores and the two second sub-scores are both straight lines.
[0015] Optionally, a connecting portion is further provided on the explosion-proof plate, one end of the connecting portion, one end of the first notch and one end of the second notch are connected, and the other end of the connecting portion, the other end of the first notch and the other end of the second notch are connected.
[0016] Optionally, the connecting portion is S-shaped.
[0017] Optionally, a thickened portion is provided on an edge of the explosion-proof disc, the thickened portion extends along the circumference of the explosion-proof disc and is connected end to end, and the explosion-proof disc is connected to the cover plate body via the thickened portion.
[0018] Optionally, the cover body is used to cover the opening of the battery shell, and two protrusions are provided on the thickened portion, each protrusion is located at one end corresponding to the connecting portion, and the two protrusions are both located on the side of the connecting portion away from the battery shell.
[0019] The second object of the present invention is to provide a battery cell having high safety and stability, high production efficiency and low production cost.
[0020] To achieve this purpose, the present invention adopts the following technical solutions:
[0021] The battery cell comprises a battery core, a battery shell and the above-mentioned battery cover plate. The battery core is arranged in the battery shell, and the cover plate body is arranged to cover the opening of the battery shell.
[0022] Beneficial effects of the utility model:
[0023] The battery cover provided by the utility model has an explosion-proof piece arranged on the cover body, and a first notch and a second notch are provided on the explosion-proof piece, the first notch and the second notch are symmetrically arranged about a first center line, and the first center line is parallel to the width direction of the cover body. When the internal pressure of the battery cell increases, the first notch and the second notch are simultaneously subjected to force and can both break, thereby realizing bidirectional symmetrical explosion of the explosion-proof piece. Compared with the unilateral notch structure, the structure in which the first notch and the second notch are symmetrically arranged about the first center line reduces the probability of different explosion values of multiple explosion-proof pieces, and has the effect of improving the safety and stability of the battery cell. Moreover, when assembling the explosion-proof piece and the cover body, there is no need to distinguish the positions of the first notch and the second notch, which is conducive to improving production efficiency and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 This is a schematic structural diagram of a battery cell provided by the present invention when the first notch and the second notch are not broken;
[0025] Figure 2 This is a schematic diagram of the structure of the battery cell after the first notch and the second notch provided by the present invention are broken;
[0026] Figure 3 This is a schematic diagram of the structure of the explosion-proof disk provided by the utility model when the first notch and the second notch are not broken;
[0027] Figure 4 It is a schematic diagram of the structure of the explosion-proof disk provided by the utility model after the first notch and the second notch are broken.
[0028] In the picture:
[0029] B1, first center line; B2, second center line;
[0030] 100, cover plate body; 200, explosion-proof disk; 210, first notch; 211, first sub-notch; 212, third sub-notch; 220, second notch; 221, second sub-notch; 222, fourth sub-notch; 230, connecting portion; 240, thickened portion; 241, protruding portion; 251, first diaphragm; 252, second diaphragm;
[0031] 10. Battery case. DETAILED DESCRIPTION
[0032] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.
[0033] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.
[0034] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.
[0035] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.
[0036] This embodiment provides a battery cover plate, which has the effect of improving the safety and stability of a battery cell, and is conducive to improving production efficiency and reducing production costs.
[0037] Specifically, if Figures 1 to 4 As shown, the battery cover includes a cover body 100 and an explosion-proof plate 200, wherein the explosion-proof plate 200 is arranged at the center of the cover body 100, and a first notch 210 and a second notch 220 are provided on the explosion-proof plate 200. The first notch 210 and the second notch 220 are symmetrically arranged about the first center line B1, and the first center line B1 is parallel to the width direction of the cover body 100.
[0038] Based on the above design, the explosion-proof disk 200 is arranged on the cover body 100, and a first notch 210 and a second notch 220 are provided on the explosion-proof disk 200. The first notch 210 and the second notch 220 are symmetrically arranged about the first center line B1, and the first center line B1 is parallel to the width direction of the cover body 100 (the x direction in the figure). When the internal pressure of the battery cell increases, the first notch 210 and the second notch 220 are simultaneously subjected to force and can both break, thereby realizing bidirectional symmetrical explosion of the explosion-proof disk 200. Compared with the unilateral notch structure, the structure in which the first notch 210 and the second notch 220 are symmetrically arranged about the first center line B1 reduces the probability of different explosion values of multiple explosion-proof disks 200, which has the effect of improving the safety and stability of the battery cell. In addition, when assembling the explosion-proof disk 200 and the cover body 100, there is no need to distinguish the positions of the first notch 210 and the second notch 220, which is conducive to improving production efficiency and reducing production costs.
[0039] Alternatively, as Figures 1 to 4 As shown, the first notch 210 includes two first sub-notches 211, and the second notch 220 includes two second sub-notches 221. Each first sub-notch 211 is symmetrically arranged with a corresponding second sub-notch 221 about the first center line B1. This structural design can increase the length of the first notch 210 and the second notch 220, thereby being able to quickly discharge the high-pressure gas in the battery shell 10, which has the effect of further improving the safety of the battery cell.
[0040] Furthermore, if Figures 1 to 4 As shown, the two first sub-scores 211 are symmetrically arranged about the second center line B2, and the two second sub-scores 221 are symmetrically arranged about the second center line B2. The second center line B2 is parallel to the length direction of the cover body 100 (the y direction in the figure), further reducing the probability of different explosion values of the explosion-proof plate 200, thereby further improving the safety and stability of the battery cell.
[0041] Alternatively, as Figures 1 to 4 As shown, the first notch 210 also includes a third sub-notch 212, and the second notch 220 also includes a fourth sub-notch 222. The third sub-notch 212 and the fourth sub-notch 222 are symmetrically arranged about the first center line B1. The two ends of the third sub-notch 212 are respectively connected to a corresponding first sub-notch 211, and the two ends of the fourth sub-notch 222 are respectively connected to a corresponding second sub-notch 221, so as to increase the length of the first notch 210 and the second notch 220, improve the exhaust efficiency, and further improve the safety of the battery cell.
[0042] Furthermore, if Figures 1 to 4 As shown, the third sub-score 212 and the fourth sub-score 222 are both arc-shaped, so as to extend the length of the third sub-score 212 and the fourth sub-score 222 to further improve the exhaust efficiency.
[0043] Alternatively, as Figures 1 to 4 As shown, the explosion-proof plate 200 is further provided with a connecting portion 230, one end of the connecting portion 230, one end of the first notch 210 and one end of the second notch 220 are connected, and the other end of the connecting portion 230, the other end of the first notch 210 and the other end of the second notch 220 are connected, thereby forming a first diaphragm 251 between the first notch 210 and the connecting portion 230, and forming a second diaphragm 252 between the second notch 220 and the connecting portion 230. When the first notch 210 and the second notch 220 are broken, the first diaphragm 251 and the second diaphragm 252 are lifted in a direction away from the battery shell 10. The arrangement of the connecting portion 230 can prevent the first diaphragm 251 and the second diaphragm 252 from flying out of the explosion-proof plate 200, thereby improving the safety of the explosion-proof plate 200.
[0044] Furthermore, if Figures 1 to 4 As shown, the connecting portion 230 is S-shaped to increase the connection length between the connecting portion 230 and the first diaphragm 251 and the second diaphragm 252, thereby improving the reliability of the connection between the connecting portion 230 and the first diaphragm 251 and the second diaphragm 252 respectively. In addition, the S-shaped connecting portion 230 makes the forces on the first diaphragm 251 and the second diaphragm 252 more evenly dispersed, which is beneficial to improving the control accuracy of the lifting angle of the first diaphragm 251 and the second diaphragm 252.
[0045] Alternatively, as Figures 1 to 4 As shown, the edge of the explosion-proof plate 200 is provided with a thickened portion 240, which extends along the circumference of the explosion-proof plate 200 and is connected end to end. The explosion-proof plate 200 is connected to the cover plate body 100 through the thickened portion 240. The design of the thickened portion 240 expands the connection volume with the cover plate body 100, thereby improving the reliability of the connection between the explosion-proof plate 200 and the cover plate body 100.
[0046] Furthermore, if Figures 1 to 4As shown, the cover body 100 is used to cover the opening of the battery shell 10, and two protrusions 241 are provided on the thickened portion 240. Each protrusion 241 is located at one end corresponding to the connecting portion 230, and the two protrusions 241 are located on the side of the connecting portion 230 away from the battery shell 10. The protrusion 241 can apply a force F toward the direction of the battery shell 10 to the connecting portion 230. When the force F is large, after the first notch 210 and the second notch 220 are broken, the first diaphragm 25 When the force F is small, the first and second diaphragms 251, 252 are lifted up at a large angle after the first notch 210 and the second notch 220 are broken. In actual production, the weight of the protrusion 241 can be changed to change the magnitude of the force F applied to the connecting portion 230, thereby changing the magnitude of the lifting angle of the first and second diaphragms 251, 252, and realizing the control of the lifting angle of the first and second diaphragms 251, 252.
[0047] It should be noted that, in this embodiment, the protrusion 241 is provided on the thickened portion 240 . Therefore, the design of the protrusion 241 is not affected by the thickness of the region of the explosion-proof disk 200 where the first notch 210 and the second notch 200 are provided.
[0048] It is understood that the bursting pressure of bursting disk 200 can be varied by changing the depths of first sub-score 211 , second sub-score 221 , third sub-score 212 , and fourth sub-score 222 .
[0049] This embodiment also provides a battery cell, which includes a battery cell, a battery shell 10 and the above-mentioned battery cover. The battery cell is arranged in the battery shell 10, and the cover body 100 is covered at the opening of the battery shell 10. The battery cell adopts the above-mentioned battery cover, has higher safety and stability, and has higher production efficiency and lower production cost.
[0050] like Figures 1 to 4As shown, in this embodiment, the explosion-proof disc 200 has a runway-shaped structure, and the length direction of the explosion-proof disc 200 is parallel to the length direction of the cover body 100. The first notch 210 and the second notch 220 are both half-runway-shaped structures, and the first notch 210 and the second notch 220 are symmetrically arranged about the centerline of the explosion-proof disc 200 in the width direction. Specifically, the third sub-notch 212 and the fourth sub-notch 222, both of which are arc-shaped, are curved in directions away from each other. The two first sub-notches 211 and the two second sub-notches 221 are both straight, and the first sub-notches 211 and the second sub-notches 221 extend in directions parallel to the length direction of the cover body 100. This explosion-proof disc 200 is suitable for medium-capacity rectangular battery cells. The following lists several dimensional parameters of battery cells suitable for the explosion-proof disc 200 provided in this embodiment. Here, the battery cell dimension in the width direction (x direction) is referred to as N1, and the battery cell dimension in the length direction (y direction) is referred to as N2.
[0051] Serial number N1 / mm N2 / mm 1 27 70 2 27 135 3 27 148 4 32 173 5 32 217
[0052] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.
Claims
1. Battery cover, characterized in that: include: Cover plate body (100); An explosion-proof plate (200) is provided on the cover plate body (100), and a first notch (210) and a second notch (220) are provided on the explosion-proof plate (200), wherein the first notch (210) and the second notch (220) are symmetrically arranged about a first center line (B1), and the first center line (B1) is parallel to the width direction of the cover plate body (100).
2. The battery cover according to claim 1, characterized in that: The first notch (210) includes two first sub-notches (211), and the second notch (220) includes two second sub-notches (221). Each of the first sub-notches (211) and a corresponding second sub-notch (221) are symmetrically arranged about the first center line (B1).
3. The battery cover according to claim 2, characterized in that: The two first sub-scores (211) are symmetrically arranged about a second center line (B2), and the two second sub-scores (221) are symmetrically arranged about the second center line (B2), and the second center line (B2) is parallel to the length direction of the cover plate body (100).
4. The battery cover according to claim 2, characterized in that: The first notch (210) further includes a third sub-notch (212), and the second notch (220) further includes a fourth sub-notch (222). The third sub-notch (212) and the fourth sub-notch (222) are symmetrically arranged about the first center line (B1). The two ends of the third sub-notch (212) are respectively connected to a corresponding one of the first sub-notches (211), and the two ends of the fourth sub-notch (222) are respectively connected to a corresponding one of the second sub-notches (221).
5. The battery cover according to claim 4, characterized in that: The third sub-score (212) and the fourth sub-score (222) are both arc-shaped, and the third sub-score (212) and the fourth sub-score (222) are both bent in directions away from each other, and the two first sub-scores (211) and the two second sub-scores (221) are both straight-line-shaped.
6. The battery cover according to any one of claims 1 to 5, characterized in that: The explosion-proof plate (200) is further provided with a connecting portion (230), one end of the connecting portion (230), one end of the first notch (210), and one end of the second notch (220) are connected, and the other end of the connecting portion (230), the other end of the first notch (210), and the other end of the second notch (220) are connected.
7. The battery cover according to claim 6, characterized in that: The connecting portion (230) is S-shaped.
8. The battery cover according to claim 6, characterized in that: The edge of the explosion-proof plate (200) is provided with a thickened portion (240), the thickened portion (240) extending along the circumference of the explosion-proof plate (200) and connected end to end, and the explosion-proof plate (200) is connected to the cover plate body (100) via the thickened portion (240).
9. The battery cover according to claim 8, characterized in that: The cover plate body (100) is used to cover the opening of the battery shell (10), and the thickened portion (240) is provided with two protrusions (241), each of the protrusions (241) is located at a corresponding end of the connecting portion (230), and the two protrusions (241) are both located on the side of the connecting portion (230) facing away from the battery shell (10).
10. A battery cell, characterized in that The invention comprises a battery cell, a battery shell (10) and a battery cover according to any one of claims 1 to 9, wherein the battery cell is arranged in the battery shell (10), and the cover body (100) is arranged to cover the opening of the battery shell (10).