Light aluminum sheet, cover plate assembly and battery cell
By setting up a convex hull reinforcement structure surrounding the explosion-proof valve on the optical aluminum sheet, the material cost and weight problems caused by the increase in the thickness of the optical aluminum sheet are solved, and the structural strength and safety performance are improved without increasing the weight, meeting the high energy density requirements of the battery cell.
Patent Information
- Application Number
- CN202422308996.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-20
- Publication Date
- 2025-08-29
- Estimated Expiration
- 2034-09-20
AI Technical Summary
In the prior art, the thickness of the optical aluminum sheet of the cover plate assembly is increased to prevent deformation and lead to high material cost and weight, which cannot meet the demands of cell design for high energy density and low cost.
A convex hull reinforcement structure surrounding the explosion-proof valve is provided on the optical aluminum sheet, including the first convex hull, the second convex hull and the reinforcement convex hull, to enhance the structural strength, especially in the explosion-proof valve position, to thin the thickness of the light aluminum sheet to reduce weight and cost.
Without increasing the weight of the light aluminum sheet, the structural strength and bending resistance of the light aluminum sheet are improved, preventing the explosion-proof valve from tearing in advance, and ensuring the safety performance and high energy density of the battery cell.
Smart Images
Figure CN223285105U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of battery cell technology, and in particular to a bare aluminum sheet, a cover plate assembly, and a battery cell. Background Art
[0002] As lithium battery technology matures, it's widely used in electric vehicles and energy storage as a power source, raising the bar for performance and safety. The cover assembly, a lithium battery accessory, serves primarily as a seal to isolate the internal and external environments. It also connects the internal and external circuits, channeling the battery's internal current through the terminals and acting as a current guide.
[0003] The cover assembly of the related technology includes a bare aluminum sheet. In order to minimize the possibility of deformation of the bare aluminum sheet, the method of increasing the thickness of the bare aluminum sheet is currently generally adopted. However, the high material cost and weight make it increasingly unable to meet the requirements of battery cell design for high energy density and low cost.
[0004] Therefore, how to provide a bare aluminum sheet, a cover plate assembly and a battery cell to reduce the thickness of the bare aluminum sheet while ensuring the strength of the cover plate, and reduce material cost and weight has become a technical problem that technical personnel in this field urgently need to solve. Utility Model Content
[0005] The purpose of this application is to provide a bare aluminum sheet, a cover plate assembly and a battery cell, which can reduce the thickness of the bare aluminum sheet while ensuring the strength of the cover plate, thereby reducing material cost and weight.
[0006] In order to solve the above technical problems, the present application provides a plain aluminum sheet, including a plain aluminum sheet body and an explosion-proof valve connected to the plain aluminum sheet body, the plain aluminum sheet body having a first bulge extending to one side, the first bulge being formed by the plain aluminum sheet body being concavely arranged along the thickness direction, and the first bulge being arranged around the explosion-proof valve.
[0007] In this embodiment, the bare aluminum sheet body is provided with a convex reinforcement structure surrounding the explosion-proof valve. Without increasing the weight of the bare aluminum sheet and meeting the lightweight requirements, the structural strength of the bare aluminum sheet body, especially the structural strength of the explosion-proof valve position, is greatly improved to prevent the bare aluminum sheet from convexly deforming outward when the internal pressure of the battery cell increases, causing the explosion-proof valve to tear and leak prematurely, thereby ensuring the safety performance of the battery cell.
[0008] Optionally, the bare aluminum sheet body is provided with a pole hole, and the bare aluminum sheet body has at least one second bulge, the second bulge protrudes toward one side of the bare aluminum sheet body, the second bulge is formed by the bare aluminum sheet body being concavely arranged along the thickness direction, and the second bulge is arranged around the pole hole.
[0009] Optionally, the bare aluminum sheet body is provided with two said pole holes, which are arranged at both ends of the explosion-proof valve along the length direction of the bare aluminum sheet body, and the bare aluminum sheet body has two said second bulges, which are arranged at both ends of the first bulge along the length direction of the bare aluminum sheet body.
[0010] Optionally, the first convex bump and the second convex bump are arranged at intervals along the length direction of the smooth aluminum sheet body.
[0011] Optionally, the plain aluminum sheet body is further provided with a reinforcing bulge extending toward one side, the reinforcing bulge being formed by the plain aluminum sheet body being concavely provided along the thickness direction, and the reinforcing bulge being located on at least one side of the first bulge.
[0012] Optionally, the reinforcing convex bump is an integral structure and extends along the width direction of the smooth aluminum sheet body;
[0013] Alternatively, the reinforcing convex hump includes at least two split parts, and the split parts are spaced apart along the width direction of the smooth aluminum sheet body.
[0014] Optionally, the bare aluminum sheet body forms a connecting wall portion in the middle of the first bulge, the connecting wall portion is provided with an explosion-proof valve hole, the explosion-proof valve is connected inside the explosion-proof valve hole, and the thickness of the connecting wall portion is greater than the thickness of other parts of the bare aluminum sheet body except the connecting wall portion.
[0015] Optionally, the plain aluminum sheet body further has a reinforcing rib, which is located in the middle of the first bulge and is arranged around the explosion-proof valve.
[0016] This embodiment also provides a cover plate assembly, including the aforementioned plain aluminum sheet.
[0017] The cover plate assembly of this embodiment includes the aforementioned plain aluminum sheet, and therefore has the same technical effects as the aforementioned plain aluminum sheet, which will not be described in detail here.
[0018] This embodiment further provides a battery cell, characterized in that it includes the aforementioned cover plate assembly, wherein the first bulge protrudes toward the interior of the battery cell, or the first bulge protrudes toward the exterior of the battery cell.
[0019] The battery cell of this embodiment includes the aforementioned cover plate assembly, and therefore has the same technical effects as the aforementioned cover plate assembly, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 This is a schematic structural diagram of the first specific embodiment of the battery cell provided in this application;
[0021] Figure 2 for Figure 1 Schematic diagram of the battery cell;
[0022] Figure 3 for Figure 1 A split diagram of the cover assembly in the battery cell;
[0023] Figure 4 for Figure 1 Schematic diagram of the structure of the light aluminum sheet in the battery cell;
[0024] Figure 5 This is a schematic structural diagram of the second specific embodiment of the battery cell provided in this application;
[0025] Figure 6 for Figure 4 A cross-sectional view of the aluminum sheet along the thickness direction;
[0026] Figure 7 for Figure 6 Enlarged view of area A in the middle;
[0027] Figure 8 for Figure 6 Enlarged view of area B in the middle;
[0028] Figure 9 for Figure 6 Enlarged view of area C in the middle;
[0029] Figure 10 This is a schematic structural diagram of the bare aluminum sheet body in the third specific embodiment of the battery cell provided in this application;
[0030] Figure 11 for Figure 10 A partially enlarged cross-sectional view of the aluminum sheet along the thickness direction;
[0031] in, Figures 1-11 The reference numerals in the figures are as follows:
[0032] 01 - Cover assembly; 1 - Plain aluminum sheet; 11 - Plain aluminum sheet body; 111 - First convex bump; 11a - Pole hole; 11b - Liquid injection port; 11c - Explosion-proof valve hole; 1A - Connecting wall; 112 - Second convex bump; 113 - Reinforcement convex bump; 114 - Reinforcement rib; 12 - Explosion-proof valve; 2 - Outer plastic; 3 - Inner plastic; 4 - Sealing ring; 5 - Pole; 6 - Pole aluminum block;
[0033] 02-winding core; 03-shell; 04-connecting piece. DETAILED DESCRIPTION
[0034] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is further described in detail below with reference to the accompanying drawings and specific embodiments.
[0035] Please refer to Figures 1-4 , Figure 1This is a schematic structural diagram of the first specific embodiment of the battery cell provided in this application; Figure 2 for Figure 1 Schematic diagram of the battery cell; Figure 3 for Figure 1 A split diagram of the cover assembly in the battery cell; Figure 4 for Figure 1 Schematic diagram of the structure of the light aluminum sheet body in the battery cell.
[0036] This embodiment provides a smooth aluminum sheet 1, including a smooth aluminum sheet body 11, and an explosion-proof valve 12 connected to the smooth aluminum sheet body 11. The smooth aluminum sheet body 11 has a first convex bulge 111 protruding to one side. The first convex bulge 111 is formed by a concave arrangement of the smooth aluminum sheet body 11 along the thickness direction. The first convex bulge 111 is arranged around the explosion-proof valve 12.
[0037] In this embodiment, the bare aluminum sheet body 11 is provided with a convex reinforcement structure surrounding the explosion-proof valve 12. Without increasing the weight of the bare aluminum sheet 1 and meeting the lightweight requirements, the structural strength of the bare aluminum sheet body 11, especially the structural strength at the position of the explosion-proof valve 12, is greatly improved, and the bending resistance of the bare aluminum sheet 1 is improved, preventing the bare aluminum sheet 1 from convexly deforming outward when the internal pressure of the battery cell increases, causing the explosion-proof valve 12 to tear and leak prematurely, thereby ensuring the safety performance of the battery cell.
[0038] Depend on Figure 4 It can be seen that in this embodiment, the aluminum sheet body 11 is provided with an explosion-proof valve hole 11c in the middle of the first convex bump 111, and the explosion-proof valve 12 is connected inside the explosion-proof valve hole 11c. In other embodiments of the present application, the aluminum sheet body 11 and the explosion-proof valve 12 can be integrally formed.
[0039] Please continue to refer to Figure 4 In this embodiment, the bare aluminum sheet body 11 is provided with a pole hole 11a, and the bare aluminum sheet body 11 has at least one second bulge 112, the second bulge 112 protrudes toward one side of the bare aluminum sheet body 11, and the second bulge 112 is formed by the bare aluminum sheet body 11 being concavely arranged along the thickness direction, and the second bulge 112 is arranged around the pole hole 11a.
[0040] In this embodiment, the bare aluminum sheet body 11 is further provided with a convex reinforcement structure surrounding the pole hole 11a, which further improves the structural strength of the pole hole 11a without increasing the weight of the bare aluminum sheet 1 and meeting the lightweight requirements, thereby further improving the structural strength of the bare aluminum sheet body 11.
[0041] Depend on Figure 4 It can be seen that the bare aluminum sheet body 11 is usually provided with two pole holes 11a, which are arranged at both ends of the explosion-proof valve 12 along the length direction of the bare aluminum sheet body 11. The two pole holes 11a are used to install the positive pole and the negative pole respectively.
[0042] In some embodiments of the present application, the bare aluminum sheet body 11 may be provided with a second convex bump 112 , and the second convex bump 112 is provided around one of the pole holes 11 a .
[0043] like Figure 4 As shown, in this embodiment, the aluminum sheet body 11 has two second convex bumps 112, which are arranged at both ends of the first convex bump 111 along the length direction of the aluminum sheet body 11, and the second convex bumps 112 are arranged one-to-one around the pole hole 11a.
[0044] In this way, multiple convex reinforcement structures are set along the length direction of the bare aluminum sheet body 11, so that each part of the bare aluminum sheet body 11 along the length direction is structurally strengthened, ensuring that each part of the bare aluminum sheet body 11 along the length direction can resist the impact of the internal pressure of the battery cell and maintain structural stability.
[0045] In addition, in some other embodiments of the present application, the two pole holes 11a are symmetrically arranged about the explosion-proof valve 12, and the two second convex bumps 112 are symmetrically arranged about the first convex bump 111. This symmetrical arrangement makes the battery cell more orderly and neat as a whole, thereby improving the quality of the battery cell.
[0046] Please continue to refer to Figure 4 In this embodiment, the first convex bump 111 and the second convex bump 112 are spaced apart along the length direction of the aluminum sheet body 11 .
[0047] In this way, a concave portion is formed between the first convex hump 111 and the second convex hump 112 . This concave-convex structure is beneficial for improving the bearing capacity of the bare aluminum sheet body 11 and enhancing the ability of the bare aluminum sheet body 11 to resist deformation.
[0048] Please refer to Figure 5 , Figure 5 This is a schematic structural diagram of the second specific embodiment of the battery cell provided in this application.
[0049] In this embodiment, the plain aluminum sheet body 11 is further provided with a reinforcing bulge 113 protruding to one side. The reinforcing bulge 113 is formed by a concave arrangement of the plain aluminum sheet body 11 along the thickness direction. The reinforcing bulge 113 is located between the first bulge 111 and the second bulge 112 .
[0050] Thus, in this embodiment, a local reinforcing bulge 113 is designed in the gap between the first bulge 111 and the second bulge 112 , which can further enhance the structural strength of the bare aluminum sheet body 11 and ensure the structural stability of the bare aluminum sheet body 11 .
[0051] In some other embodiments of the present application, it is also feasible that the bare aluminum sheet body 11 does not have the second convex hump 112 , and the number of the reinforcing convex hump 113 is at least one, and is located on at least one side of the first convex hump 111 , thereby strengthening the structure of the bare aluminum sheet body 11 .
[0052] like Figure 5 As shown, in this embodiment, the reinforcing bulge 113 located on one side of the first bulge 111 is an integrated structure and extends along the width direction of the smooth aluminum sheet body 11; the reinforcing bulge 113 located on the other side of the first bulge 111 is a split structure, and the reinforcing bulge 113 includes two split parts 113A, and the two split parts 113A are spaced apart along the width direction of the smooth aluminum sheet body 11, and the smooth aluminum sheet body 11 is provided with a liquid injection port 11b, and the liquid injection port 11b is located between the two split parts 113A.
[0053] In this way, this embodiment makes full use of the space of the bare aluminum sheet body 11. While improving the structural strength of the bare aluminum sheet body 11 through the convex reinforcement structure, the design space of the liquid injection port 11b is reserved between the two split parts 113A to retain the liquid injection function of the battery cell.
[0054] It can be understood that the number of split parts 113A included in the reinforcement convex hull 113 is not limited. In some other embodiments of the present application, the number of split parts 113A included in the reinforcement convex hull 113 can be at least two.
[0055] Depend on Figure 5 It can be seen that in this embodiment, the first convex hump 111, the second convex hump 112 and the reinforcing convex hump 113 protrude to the same side of the plain aluminum sheet body 11. In this way, the first convex hump 111, the second convex hump 112 and the reinforcing convex hump 113 can be formed in one process, thereby improving processing efficiency.
[0056] In some other embodiments of the present application, the protruding directions of the first convex hump 111 , the second convex hump 112 and the reinforcing convex hump 113 may also be different, which does not affect the structural reinforcement effect of the smooth aluminum sheet body 11 .
[0057] Please continue to refer to Figure 4 , Figure 6-Figure 9 , Figure 6 for Figure 4 A cross-sectional view of the aluminum sheet along the thickness direction; Figure 7 for Figure 6 Enlarged view of area A in the middle; Figure 8 for Figure 6 Enlarged view of area B in the middle; Figure 9 for Figure 6 Magnified view of area C in the middle.
[0058] In some embodiments of the present application, the bare aluminum sheet body 11 forms a connecting wall portion 1A in the middle of the first bulge 111, and the connecting wall portion 1A is provided with an explosion-proof valve hole 11c. The explosion-proof valve 12 is connected inside the explosion-proof valve hole 11c, and the thickness of the connecting wall portion 1A is greater than the thickness of other parts of the bare aluminum sheet body 11 except the connecting wall portion 1A.
[0059] like Figure 8 As shown, in this embodiment, the thickness of the connecting wall portion 1A is T1, and the thickness of other parts of the bare aluminum sheet body 11 except the connecting wall portion 1A is T2, and T1>T2.
[0060] As set above, the thickness of the connecting wall 1A is greater than the thickness of other parts of the bare aluminum sheet body 11 except the connecting wall 1A, which is beneficial to the flow and extension of the metal during the stamping process of the explosion-proof valve hole 11c, and improves the structural rigidity of the connection position between the bare aluminum sheet body 11 and the explosion-proof valve 12, ensuring the reliable connection between the bare aluminum sheet body 11 and the explosion-proof valve 12.
[0061] Furthermore, with the exception of the connecting wall 1A, the thickness of all other parts of the bare aluminum sheet body 11 is uniform. This allows the thickness of all other parts of the bare aluminum sheet body 11, except for the connecting wall 1A, to be reduced while maintaining the structural strength of the bare aluminum sheet body 11, thereby reducing weight and cost and increasing the energy density of the battery cell.
[0062] Please refer to Figure 10-11 , Figure 10 This is a schematic structural diagram of the bare aluminum sheet body in the third specific embodiment of the battery cell provided in this application; Figure 11 for Figure 10 A partially enlarged cross-sectional view of the aluminum sheet along the thickness direction.
[0063] In this embodiment, the plain aluminum sheet body 11 further has a reinforcing rib 114 . The reinforcing rib 114 is located in the middle of the first bulge 111 and is disposed around the explosion-proof valve 12 .
[0064] In this embodiment, the bare aluminum sheet body 11 forms a local thickened area by providing reinforcing ribs 114 , and the local thickened area is provided around the explosion-proof valve 12 , further reinforcing the structural strength around the explosion-proof valve 12 and improving the structural reliability of the explosion-proof valve 12 .
[0065] like Figure 10-11 As shown, in this embodiment, the first bump 111 protrudes upward, and the reinforcing rib 114 also protrudes upward along the thickness direction of the aluminum sheet body 11, with the upper end profile of the reinforcing rib 114 lower than the upper end profile of the first bump 111. In this way, the reinforcing rib 114 is located within the height range of the first bump 111 and does not need to occupy a separate height space.
[0066] like Figure 10-11 As shown, in this embodiment, there is a gap between the reinforcing rib 114 and the opposite peripheral wall of the first convex bump 111. In this way, while ensuring that the reinforcing rib 114 reinforces the structure around the explosion-proof valve 12, the width of the thickened area is minimized, reducing the weight and cost of the bare aluminum sheet 1.
[0067] This embodiment also provides a cover plate assembly 01, including the aforementioned plain aluminum sheet 1.
[0068] The cover assembly 01 of this embodiment includes the aforementioned plain aluminum sheet 1, and therefore has the same technical effects as the aforementioned plain aluminum sheet 1, which will not be described in detail here.
[0069] Furthermore, if Figure 3 As shown, the cover assembly 01 also includes an outer plastic 2, an inner plastic 3, a pole assembly and a sealing ring 4. The outer plastic 2 and the inner plastic 3 are respectively connected to the inner and outer sides of the plain aluminum sheet 1. The outer plastic 2, the plain aluminum sheet 1 and the inner plastic 3 form a cover. The outer plastic 2, the plain aluminum sheet 1 and the inner plastic 3 are correspondingly provided with through holes to form a pole hole 11a. The pole assembly is connected inside the pole hole 11a. The sealing ring 4 is fitted on the pole assembly and pressed between the pole assembly and the cover to ensure the sealing performance of the pole assembly and the cover.
[0070] Among them, the pole assembly includes a pole 5 and a pole aluminum block 6. The pole aluminum block 6 is provided with a pole connecting hole. One end of the pole 5 is inserted into the pole connecting hole. The pole 5 and the pole aluminum block 6 are riveted and fixed and electrically connected. One of the pole 5 and the pole aluminum block 6 is located on the inner side of the cover plate and is used to be electrically connected to the connecting piece inside the battery cell, and the other is located on the outer side of the cover plate and is used to be electrically connected to the external bar.
[0071] Combine Figure 3 and Figure 4 It is understood that, in this embodiment, a receiving groove for receiving the pole aluminum block 6 is formed inside the second convex bump 112 .
[0072] This embodiment also provides a battery cell, including the aforementioned cover plate assembly 01.
[0073] The battery cell of this embodiment includes the aforementioned cover plate assembly 01, and therefore has the same technical effects as the aforementioned cover plate assembly 01, which will not be described in detail here.
[0074] Among them, such as Figure 2 As shown, the battery cell also includes a core 02, a shell 03 and a connecting piece 04. The core 02 is the main body of the battery cell that provides electrical energy. The interior of the shell 03 is hollow, and one end of the shell 03 is an open end. The interior of the shell 03 forms a accommodating space for the core 02, providing support and protection for the core 02. The cover assembly 01 is connected to the open end of the shell 03 and is welded and sealed with the shell 03. The pole 5 in the cover assembly 1 is electrically connected to the pole ear 021 of the core 02 through the connecting piece 04.
[0075] The above is only a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.
Claims
1. A light aluminum sheet, characterized in that: The invention comprises a plain aluminum sheet body (11), and an explosion-proof valve (12) connected to the plain aluminum sheet body (11), wherein the plain aluminum sheet body (11) has a first convex bump (111) protruding toward one side, the first convex bump (111) is formed by the plain aluminum sheet body (11) being concavely arranged along the thickness direction, and the first convex bump (111) is arranged around the explosion-proof valve (12).
2. The light aluminum sheet according to claim 1, characterized in that: The bare aluminum sheet body (11) is provided with a pole hole (11a), and the bare aluminum sheet body (11) has at least one second convex bulge (112), the second convex bulge (112) protruding toward one side of the bare aluminum sheet body (11), the second convex bulge (112) being formed by the bare aluminum sheet body (11) being concavely arranged along the thickness direction, and the second convex bulge (112) being arranged around the pole hole (11a).
3. The light aluminum sheet according to claim 2, characterized in that: The bare aluminum sheet body (11) is provided with two pole holes (11a), and the two pole holes (11a) are respectively arranged at two ends of the explosion-proof valve (12) along the length direction of the bare aluminum sheet body (11); the bare aluminum sheet body (11) has two second convex hulls (112), and the two second convex hulls (112) are respectively arranged at two ends of the first convex hull (111) along the length direction of the bare aluminum sheet body (11).
4. The light aluminum sheet according to claim 2, characterized in that: The first convex bump (111) and the second convex bump (112) are arranged at intervals along the length direction of the smooth aluminum sheet body (11).
5. The light aluminum sheet according to claim 1, characterized in that: The bare aluminum sheet body (11) is further provided with a reinforcing convex bump (113) protruding toward one side, the reinforcing convex bump (113) being formed by the bare aluminum sheet body (11) being concavely arranged along the thickness direction, and the reinforcing convex bump (113) being located on at least one side of the first convex bump (111).
6. The light aluminum sheet according to claim 5, characterized in that: The reinforcing convex bump (113) is an integral structure and extends along the width direction of the smooth aluminum sheet body (11); Alternatively, the reinforcing convex bump (113) comprises at least two split parts (113A), and each of the split parts (113A) is spaced apart and distributed along the width direction of the smooth aluminum sheet body (11).
7. The light aluminum sheet according to any one of claims 1 to 6, characterized in that: The bare aluminum sheet body (11) forms a connecting wall portion (1A) in the middle of the first convex bump (111), the connecting wall portion (1A) is provided with an explosion-proof valve hole (11c), the explosion-proof valve (12) is connected inside the explosion-proof valve hole (11c), and the thickness of the connecting wall portion (1A) is greater than the thickness of other parts of the bare aluminum sheet body (11) except the connecting wall portion (1A).
8. The light aluminum sheet according to any one of claims 1 to 6, characterized in that: The bare aluminum sheet body (11) further has a reinforcing rib (114), the reinforcing rib (114) being located in the middle of the first bulge (111) and arranged around the explosion-proof valve (12).
9. A cover plate assembly, characterized in that: The invention comprises the light aluminum sheet according to any one of claims 1 to 8.
10. A battery cell, characterized in that: The cover plate assembly comprises the cover plate assembly according to claim 9, wherein the first bulge (111) protrudes toward the interior of the battery cell, or the first bulge (111) protrudes toward the exterior of the battery cell.