Battery cap and single battery

Abstract

The battery cap comprises a top cover and an anti-explosion piece, a receding groove is formed in one side of the top cover, the anti-explosion piece comprises a first base body and a connecting part which are connected with each other, the first base body is arranged on the side, away from the receding groove, of the top cover, the connecting part and the first base body wrap the end of the top cover, the connecting part is assembled in the receding groove, and the first base body is arranged on the side, away from the receding groove, of the top cover. And in the thickness direction of the battery cap, the connecting part is arranged in the abdicating groove. The single battery solves the technical problem of improving the space utilization rate and the energy density of the single battery.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a battery cap and monomer battery. BACKGROUND

[0002] The traditional 21700 and 18650 lithium batteries often use battery caps with full package structure and half package structure in the manufacturing process. The cap with full package structure can cover all sides of the battery due to its design, providing more comprehensive protection, so it has good pressure resistance and protection performance in use. However, due to the need to increase additional materials, the weight and thickness of the cap are significantly increased, which makes the available space inside the battery cell correspondingly reduced under the same battery cell, thereby affecting the space utilization and energy density of the battery. SUMMARY

[0003] One purpose of the utility model is to provide a battery cap and monomer battery, which aims to solve the technical problem of improving the space utilization and energy density of monomer battery.

[0004] To achieve the above purpose, the utility model provides a scheme: a battery cap, characterized by comprising: a top cover and a rupture disc, the top cover is provided with a slot on one side, the rupture disc comprises a first base body and a connecting part connected with each other, the first base body is arranged on the side of the top cover away from the slot, the connecting part supports the end of the top cover with the first base body, and the connecting part is assembled in the slot. In the thickness direction of the battery cap, the connecting part is arranged in the slot.

[0005] Optionally, the thickness of the connecting part is L1, the thickness of the first base body is L2, and L1

[0006] Optionally, 0.05≤L1 / L2≤0.3.

[0007] Optionally, 0.12≤L1 / L2≤0.18.

[0008] Optionally, the depth of the slot is L3, the thickness of the top cover is L4, and 0.1≤L3 / L4≤0.6.

[0009] Optionally, 0.29≤L3 / L4≤0.42.

[0010] Optionally, the battery cap comprises a sealing ring, the sealing ring comprises a second base body and a convex part, the second base body wraps the end of the first base body and the connecting part, and the convex part is arranged on one side of the second base body in a protruding manner, and the convex part abuts against the second base body and / or the connecting part.

[0011] Optionally, the battery cap includes a perforated plate and a gasket. Part of the perforated plate is connected to the first substrate. The perforated plate has through holes. The gasket is embedded at the end of the perforated plate and the first substrate. The gasket, the perforated plate, and the explosion-proof sheet together enclose a pressure-bearing space, which is connected to the through holes.

[0012] Optionally, the explosion-proof sheet includes a conductive part that protrudes from the first substrate in a direction away from the top cover. The first substrate is electrically connected to the perforated plate through the conductive part. The side of the perforated plate away from the conductive part is used to be electrically connected to the electrode tab of the battery cell. A gasket is used to separate the first substrate and the perforated plate. The perforated plate, gasket, first substrate and conductive part together enclose a pressure-bearing space.

[0013] Optionally, the length of the relief groove is greater than the length of the connecting part, and a welding space is formed between the end of the connecting part away from the first substrate and the inner wall of the relief groove in the direction perpendicular to the thickness of the battery cap.

[0014] To achieve the above objectives, the present invention provides a solution as follows: a single battery, characterized in that it includes a casing, a battery cell, and a battery cap, wherein the battery cell is assembled in the casing, and the battery cap and the tabs of the battery cell are electrically connected.

[0015] The beneficial effects of this utility model are as follows:

[0016] A single-cell battery includes a casing, a cell, and a battery cap, wherein the cell is assembled in the casing, and the battery cap and the tabs of the cell are electrically connected.

[0017] Specifically, the battery cap includes a top cover and an explosion-proof plate. A relief groove is provided on one side of the top cover. The explosion-proof plate includes a first base and a connecting part that are connected to each other. The first base is located on the side of the top cover away from the relief groove. The connecting part and the first base cover the end of the top cover. The connecting part is assembled in the relief groove. In the thickness direction of the battery cap, the connecting part is located in the relief groove.

[0018] In practical applications, the connecting part and the first substrate cover the end of the top cover. The housing presses and fixes the connecting part, the first substrate, and the top cover together, forming an integrated connection between the explosion-proof sheet, the top cover, and the housing, thereby significantly improving the structural strength of the battery cap. Furthermore, the connecting part is located within a clearance groove, effectively reducing the space occupied by the battery cap in the thickness direction, further improving the space utilization and energy density of the individual battery cells, and providing support for the miniaturization and high-performance design of individual battery cells. That is, while maintaining the same external dimensions of the individual battery cells, the volume of the cell can be further increased, thereby improving the internal space utilization of the individual battery cells, thus increasing the capacity and energy density of the individual battery cells. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 This is a partial cross-sectional view provided by an embodiment of the present invention for showing a single battery cell;

[0021] Figure 2 This is a schematic diagram of the structure of the top cover provided in this embodiment of the utility model;

[0022] Figure 3 This is a schematic diagram of the structure of a perforated plate provided in an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure used to demonstrate the sealing mechanism provided in this embodiment of the utility model;

[0024] Figure 5 This is provided by the embodiment of the present utility model. Figure 4 Schematic diagram of the cross-sectional structure at point AA;

[0025] Figure 6 This is provided by the embodiment of the present utility model. Figure 5 A magnified view of a portion of region B in the middle.

[0026] Explanation of icon numbers:

[0027] 20. Top cover; 21. Relief groove; 30. Explosion-proof sheet; 31. First base; 32. Connecting part; 33. Conductive part; 40. Sealing ring; 41. Second base; 42. Protrusion; 50. Perforated plate; 51. Through hole; 60. Gasket; 70. Pressure bearing space; 80. Housing; 90. Battery cell; 100. Welding space. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Please see Figures 1 to 6 As shown, Figure 1 This is a partial cross-sectional view provided by an embodiment of the present invention for illustrating a single battery cell.Figure 2 This is a structural schematic diagram of the top cover 20 provided in an embodiment of the present invention. Figure 3 This is a schematic diagram of the structure of the perforated plate 50 provided in this embodiment of the present invention. Figure 4 This is a schematic diagram of the structure used to demonstrate the sealing mechanism according to an embodiment of the present invention. Figure 5 This is provided by the embodiment of the present utility model. Figure 4 Schematic diagram of the cross-sectional structure at point AA. Figure 6 This is provided by the embodiment of the present utility model. Figure 5 A magnified view of a portion of region B in the middle.

[0030] This utility model provides a single battery, including a housing 80, a battery cell 90, and a battery cap. The battery cell 90 is assembled in the housing 80, and the battery cap and the tabs of the battery cell 90 are electrically connected.

[0031] Specifically, the battery cap includes a top cover 20 and an explosion-proof plate 30. A relief groove 21 is provided on one side of the top cover 20. The explosion-proof plate 30 includes a first base 31 and a connecting part 32 connected to each other. The first base 31 is disposed on the side of the top cover 20 away from the relief groove 21. The connecting part 32 and the first base 31 support the end of the top cover 20. The connecting part 32 is assembled in the relief groove 21. In the thickness direction of the battery cap, the connecting part 32 is disposed in the relief groove 21.

[0032] In practical applications, the connecting part 32 and the first base 31 cover the end of the top cover 20. The housing 80 presses and fixes the connecting part 32, the first base 31, and the top cover 20 together, forming an integrated connection between the explosion-proof sheet 30, the top cover 20, and the housing 80, thereby significantly improving the structural strength of the battery cap. Furthermore, the connecting part 32 is located within the clearance groove 21, effectively reducing the space occupied by the battery cap in the thickness direction, further improving the space utilization and energy density of the single battery cell, and providing support for the miniaturization and high-performance design of the single battery cell. That is, while maintaining the external dimensions of the single battery cell, the volume of the cell 90 can be further increased, thereby improving the internal space utilization of the single battery cell, thus increasing the capacity and energy density of the single battery cell. This single battery cell is suitable for battery products with stringent requirements for miniaturization and high energy density.

[0033] In one embodiment, see Figure 6 The thickness of the connecting part 32 is L1, and the thickness of the first base 31 is L2, where L1 < L2.

[0034] In practical applications, the thickness of the connecting portion 32 is less than the thickness of the first base 31. This design effectively reduces the space required to accommodate the connecting portion 32, thereby reducing the depth of the relief groove 21. Reducing the depth of the relief groove 21 not only optimizes the structural design of the top cover 20 but also significantly improves its overall strength. Furthermore, by reducing the depth of the relief groove 21, the structural strength of the top cover 20 can be improved without increasing its thickness, thus ensuring strength while avoiding adverse effects on battery volume and weight.

[0035] Further, see Figure 6 , 0.05≤L1 / L2≤0.3.

[0036] Further, see Figure 6 , 0.12≤L1 / L2≤0.18.

[0037] In one embodiment, see Figure 5 The depth of the clearance groove 21 is L3, the thickness of the top cover 20 is L4, and 0.1≤L3 / L4≤0.6.

[0038] In practical applications, increasing the depth of the relief groove 21 will reduce the structural strength of the top cover 20. Therefore, by rationally designing the depth of the relief groove 21, the structural strength of the top cover 20 can be effectively guaranteed without increasing its thickness, thereby achieving a balance between structural performance and space utilization.

[0039] Furthermore, referring to Figure 5 , 0.29≤L3 / L4≤0.42.

[0040] In one embodiment, reference is made to Figure 3 and Figure 6 The battery cap includes a sealing ring 40, which includes a second base 41 and a protrusion 42. The second base 41 covers the end of the first base 31 and the connecting portion 32. The protrusion 42 protrudes from one side of the second base 41 and abuts against the second base 41 and / or the connecting portion 32.

[0041] In practical applications, when the first base 31 and the connecting portion 32 cover the end of the top cover 20, a rounded corner structure is formed at the bend. This rounded corner structure abuts against the protrusion 42, effectively filling the gap between the explosion-proof sheet 30 and the sealing ring 40, ensuring improved sealing performance. Through this design, the sealing ring 40 can provide a stronger clamping effect, thereby significantly improving the overall sealing performance of the battery cap, preventing gas leakage or infiltration of external substances, and enhancing the safety and stability of the battery. In addition, the cooperation between the protrusion 42 and the rounded corner further optimizes the stability and reliability of the overall structure, improves the long-term durability of the battery cap, and meets the stringent sealing requirements of high-performance batteries.

[0042] In one embodiment, reference is made to Figure 3 and Figure 6 The battery cap includes a perforated plate 50 and a gasket 60. Part of the perforated plate 50 is connected to the first base 31. The perforated plate 50 has a through hole 51. The gasket 60 is embedded at the end of the perforated plate 50 and the first base 31. The gasket 60, the perforated plate 50 and the explosion-proof sheet 30 together enclose a pressure-bearing space 70, which is connected to the through hole 51.

[0043] In practical applications, the pressure-bearing space 70 is connected to the interior of the individual battery cell through the through-hole 51, thereby effectively expanding the effective internal volume of the individual battery cell. The pressure-bearing space 70 not only provides additional space to withstand internal gas pressure but also effectively disperses the pressure inside the individual battery cell, preventing excessive internal pressure from concentrating in a single location within the battery, significantly improving its ability to withstand internal pressure. This design can greatly improve the internal pressure-bearing limit of the individual battery cell, preventing rupture or explosion under extreme conditions such as thermal runaway, thereby enhancing battery safety and reliability, ensuring battery stability under high pressure and high temperature environments, and effectively extending battery life.

[0044] Furthermore, referring to Figure 6 The explosion-proof sheet 30 includes a conductive part 33, which protrudes from the first base 31 in a direction away from the top cover 20. The first base 31 is electrically connected to the perforated plate 50 through the conductive part 33. The side of the perforated plate 50 away from the conductive part 33 is used to be electrically connected to the tab of the battery cell 90. The gasket 60 is used to separate the first base 31 and the perforated plate 50. The perforated plate 50, the gasket 60, the first base 31 and the conductive part 33 together enclose a pressure-bearing space 70.

[0045] In practical applications, when a single battery cell experiences thermal runaway, causing the internal pressure to exceed the pressure limit of the perforated plate 50, the perforated plate 50 and the conductive part 33 will burst and separate in a direction away from the cell 90, thereby severing the electrical connection between the first substrate 31 and the perforated plate 50, resulting in immediate power loss to external devices. This design, by constructing a self-power-off mechanism inside the battery, ensures that in abnormal situations such as thermal runaway, it can effectively prevent the battery from continuing to conduct electricity or experiencing circuit failures, preventing dangers such as battery fires or explosions. Through this effective electrical connection disconnection, the single battery cell not only significantly improves its safety but also ensures the safe operation of external devices, thereby further enhancing the overall reliability of the battery and device system.

[0046] In one embodiment, reference is made to Figure 6 Figure 6 The length of the relief groove 21 is greater than the length of the connecting part 32. In the thickness direction perpendicular to the battery cap, a welding space 100 is formed between the end of the connecting part 32 away from the first base 31 and the inner wall of the relief groove 21.

[0047] In practical applications, by setting a relatively long clearance groove 21, a welding space 100 is formed relative to the length of the connecting part 32. This space provides ample operating space for welding the explosion-proof sheet 30 to the cap. The design of the welding space 100 ensures that when the end of the housing 80 is pressed against the connecting part 32 and the first base 31, the connecting part 32 will not deform due to interference with the top cover 20, thus avoiding the problem of insufficient sealing of the battery cap due to deformation. In addition, after the sealing ring 40 is pressed against the top cover 20, it can effectively cover the welding space 100, further improving the sealing effect of the battery cap and ensuring the safety and reliability of the battery pack during use.

[0048] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indicator will also change accordingly.

[0049] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0050] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0051] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A battery cap, characterized in that, include: The top cover has a clearance groove on one side; An explosion-proof sheet includes a first base and a connecting portion that are interconnected. The first base is disposed on the side of the top cover away from the relief groove. The connecting portion and the first base cover the end of the top cover. The connecting portion is assembled in the relief groove. In the thickness direction of the battery cap, the connecting portion is disposed in the relief groove.

2. The battery cap according to claim 1, characterized in that, The thickness of the connecting part is L1, and the thickness of the first substrate is L2, where L1 < L2.

3. The battery cap according to claim 2, characterized in that, 0.05≤L1 / L2≤0.

3.

4. The battery cap according to claim 3, characterized in that, 0.12≤L1 / L2≤0.

18.

5. The battery cap according to claim 1, characterized in that, The depth of the relief groove is L3, and the thickness of the top cover is L4, where 0.1 ≤ L3 / L4 ≤ 0.

6.

6. The battery cap according to claim 5, characterized in that, 0.29≤L3 / L4≤0.

42.

7. The battery cap according to any one of claims 1 to 6, characterized in that, The battery cap includes a sealing ring, which includes a second base and a protrusion. The second base supports the end of the first base and the connecting portion. The protrusion protrudes from one side of the second base and abuts against the second base and / or the connecting portion.

8. The battery cap according to any one of claims 1 to 6, characterized in that, The battery cap includes a perforated plate and a gasket. Part of the perforated plate is connected to the first substrate. The perforated plate has a through hole. The gasket is embedded at the end position of the perforated plate and the first substrate. The gasket, the perforated plate, and the explosion-proof sheet together enclose a pressure-bearing space. The pressure-bearing space is connected to the through hole.

9. The battery cap according to claim 8, characterized in that, The explosion-proof sheet includes a conductive part that protrudes from the first substrate in a direction away from the top cover. The first substrate is electrically connected to the perforated plate through the conductive part. The side of the perforated plate away from the conductive part is used to be electrically connected to the electrode tab of the battery cell. The gasket is used to separate the first substrate and the perforated plate. The perforated plate, the gasket, the first substrate, and the conductive part together enclose a pressure-bearing space.

10. The battery cap according to any one of claims 1 to 6, characterized in that, include: The length of the relief groove is greater than the length of the connecting part. In the direction perpendicular to the thickness of the battery cap, a welding space is formed between the end of the connecting part away from the first substrate and the inner wall of the relief groove.

11. A single-cell battery, characterized in that, The battery includes a housing, a battery cell, and a battery cap as described in any one of claims 1 to 9, wherein the battery cell is assembled in the housing, and the battery cap and the tabs of the battery cell are electrically connected.

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