A battery

Abstract

The utility model discloses a battery, including cover, shell, first sealing portion and second sealing portion, the end of cover is provided with around shell, first sealing portion includes first surface and second surface, and first sealing portion is clamped between cover and shell, and at least partial first surface and shell are pasted, and at least partial second surface and cover are pasted. Second sealing portion includes third surface and fourth surface, and second sealing portion is clamped between cover and shell, and is set apart with first sealing portion, and at least partial third surface and shell are pasted, and at least partial fourth surface and cover are pasted, and shell, first sealing portion, cover, second sealing portion are surrounded and form the deformation space. The battery of the application can solve the technical problem of the problem of the deformation of cover and explosion -proof valve caused by the extrusion of sealing ring.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery. Background Technology

[0002] With the rapid development of portable electronic devices and the new energy industry, steel-cased batteries are widely used due to their excellent mechanical strength and sealing performance. Currently, the main sealing methods for steel-cased batteries are grooving sealing and screw sealing. These sealing methods typically involve a casing, a cover plate, and a sealing ring positioned between them. The sealing ring is generally made of rubber or polymer materials. During installation, the sealing ring is first inserted between the opening of the casing and the cover plate. Then, a grooving or screw sealing process is performed using specialized equipment to plastically deform the casing opening, making it tightly wrap around the edge of the cover plate, and applying axial compressive force to the sealing ring. After compression, the sealing ring's rebound force can fill the tiny gaps between the casing and the cover plate radially and axially, effectively preventing electrolyte leakage and external impurities from entering the battery, thus achieving a reliable battery seal.

[0003] However, in existing sealing structures, the sealing ring is easily subjected to excessive compression during the shell molding process, which in turn transfers the compressive force to the cover plate, causing it to deform. Since the explosion-proof valve is generally located on the cover plate, deformation of the cover plate will cause deformation of the explosion-proof valve, thus affecting its normal opening and closing function. In severe cases, the deformed explosion-proof valve may lose its sealing function, resulting in leakage, which in turn affects the safety and reliability of the battery.

[0004] Therefore, the existing steel-cased battery sealing structure still has room for improvement in terms of sealing reliability and the stability of the explosion-proof valve structure. How to solve the problem of deformation of the cover plate and explosion-proof valve caused by the compression of the sealing ring has become a pressing technical challenge in this field. Utility Model Content

[0005] One objective of this invention is to provide a battery that addresses the technical problem of deformation of the cover plate and explosion-proof valve caused by the compression of the sealing ring.

[0006] To achieve the above objectives, the present invention provides a solution: a battery, characterized in that it comprises: a cover plate, a shell, a first sealing part, and a second sealing part, the shell being disposed around the end of the cover plate. The first sealing part includes a first surface and a second surface, the first sealing part being sandwiched between the cover plate and the shell, at least a portion of the first surface being in contact with the shell, and at least a portion of the second surface being in contact with the cover plate. The second sealing part includes a third surface and a fourth surface, the second sealing part being sandwiched between the cover plate and the shell, and being spaced apart from the first sealing part, at least a portion of the third surface being in contact with the shell, and at least a portion of the fourth surface being in contact with the cover plate, the shell, the first sealing part, the cover plate, and the second sealing part forming a deformable space.

[0007] Optionally, the second surface includes a first sub-surface and a second sub-surface, the second sub-surface is fitted to the cover plate, the first sub-surface and the second sealing part are disposed opposite to each other, the fourth surface includes a third sub-surface and a fourth sub-surface, the fourth sub-surface is fitted to the cover plate, the third sub-surface and the first sub-surface are disposed opposite to each other, and a deformable space is formed between the third sub-surface, the first sub-surface, the outer shell and the cover plate.

[0008] Optionally, the cover plate includes a fifth, a sixth, and a seventh surface, which are connected in sequence. The fifth surface is connected to the second sub-surface, and the seventh surface is connected to the fourth sub-surface. The sixth surface faces the deformation space, and the outer shell, the sixth surface, the third sub-surface, and the first sub-surface enclose the deformation space.

[0009] Optionally, in the thickness direction of the cover plate, the thickness of the deformation space is A1, the distance between the fifth and seventh surfaces is A2, and 0.2≤A1 / A2≤0.9.

[0010] Optionally, a first space is formed between the portion of the first surface near the deformation space and the outer shell, and the first space and the deformation space are connected.

[0011] Optionally, in the direction perpendicular to the thickness of the cover plate, the width of the first space is B1, the width of the deformation space is B3, and 0 < B1 / B3 ≤ 0.3.

[0012] Optionally, a second space is formed between the portion of the third surface near the deformation space and the outer shell, and the second space is connected to the deformation space.

[0013] Optionally, in the direction perpendicular to the thickness of the cover plate, the width of the second space is B2, the width of the deformation space is B3, and 0 < B2 / B3 ≤ 0.3.

[0014] Optionally, the second surface is fitted to the cover plate, the first surface includes a fifth sub-surface and a sixth sub-surface, the sixth sub-surface is fitted to the outer shell, and the fifth sub-surface is disposed between the sixth sub-surface and the second surface, with the fifth sub-surface facing the outer shell;

[0015] The third surface is attached to the outer shell, the fourth surface includes the third sub-surface and the fourth sub-surface, the fourth sub-surface is attached to the cover plate, the third sub-surface faces the outer shell, and the third sub-surface, the fifth sub-surface, the outer shell and the cover plate form a deformation space.

[0016] Optionally, the first sealing part or the second sealing part includes a base and a casting part, with a portion of the base sandwiched between the cover plate and the outer shell, and the casting part located at the end of the base away from the outer shell, with a clearance space formed between the casting part and the outer shell.

[0017] The beneficial effects of this utility model are as follows:

[0018] The battery includes a cover plate, a casing, a first sealing part, and a second sealing part. The casing covers the end of the cover plate. The first sealing part includes a first surface and a second surface, and is sandwiched between the cover plate and the casing. At least a portion of the first surface is in contact with the casing, and at least a portion of the second surface is in contact with the cover plate. The second sealing part includes a third surface and a fourth surface, and is sandwiched between the cover plate and the casing, and is spaced apart from the first sealing part. At least a portion of the third surface is in contact with the casing, and at least a portion of the fourth surface is in contact with the cover plate. The casing, the first sealing part, the cover plate, and the second sealing part form a deformable space.

[0019] When installing the first and second sealing parts, the first and second sealing parts are first spaced apart at the ends of the cover plate. Then, the steel shell is bent so that it covers the ends of the cover plate. When bending the steel shell, the steel shell compresses the first and second sealing parts, causing them to deform and seal the gap between the steel shell and the cover plate. Since the first and second sealing parts are spaced apart, the space between them provides a buffer for the compression deformation of the first and second sealing parts, thereby reducing the pressure exerted on the ends of the cover plate by the first and second sealing parts during deformation. Attached Figure Description

[0020] 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.

[0021] Figure 1 This is a schematic diagram of the cross-sectional structure of the battery provided in an embodiment of the present utility model;

[0022] Figure 2 This is provided by the embodiment of the present utility model. Figure 1 A magnified view of a portion of region A in the middle;

[0023] Figure 3 This is a schematic diagram of a cross-sectional structure provided by an embodiment of the present invention to illustrate the deformation space when the first sub-surface and the third sub-surface are relative to each other;

[0024] Figure 4 This is a cross-sectional structural diagram of the first space and the second space provided in an embodiment of the present invention;

[0025] Figure 5 This is a cross-sectional structural diagram of the first space and the second space provided in an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the cross-sectional structure of the battery provided in an embodiment of this utility model.

[0027] Explanation of icon numbers:

[0028] 20. Outer shell; 30. Cover plate; 31. Fifth surface; 32. Sixth surface; 33. Seventh surface; 40. First sealing part; 41. First surface; 411. Fifth sub-surface; 412. Sixth sub-surface; 42. Second surface; 421. First sub-surface; 422. Second sub-surface; 50. Second sealing part; 51. Third surface; 52. Fourth surface; 521. Third sub-surface; 522. Fourth sub-surface; 53. Substrate; 54. Casting part; 60. Deformation space; 70. First space; 80. Second space; 90. Clearance space. Detailed Implementation

[0029] 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.

[0030] Please see Figures 1 to 2 As shown, Figure 1 This is a schematic diagram of the cross-sectional structure of the battery provided in an embodiment of the present invention. Figure 2 This is provided by the embodiment of the present utility model. Figure 1 A magnified view of a portion of region A in the middle.

[0031] This utility model provides a battery comprising: a cover plate 30, a housing 20, a first sealing part 40, and a second sealing part 50. The housing 20 is disposed around the end of the cover plate 30. The first sealing part 40 includes a first surface 41 and a second surface 42, and is sandwiched between the cover plate 30 and the housing 20. At least a portion of the first surface 41 is in contact with the housing 20, and at least a portion of the second surface 42 is in contact with the cover plate 30. The second sealing part 50 includes a third surface 51 and a fourth surface 52, and is sandwiched between the cover plate 30 and the housing 20, and is spaced apart from the first sealing part 40. At least a portion of the third surface 51 is in contact with the housing 20, and at least a portion of the fourth surface 52 is in contact with the cover plate 30. The housing 20, the first sealing part 40, the cover plate 30, and the second sealing part 50 form a deformable space 60.

[0032] In practical applications, when installing the first sealing part 40 and the second sealing part 50, the first sealing part 40 and the second sealing part 50 are first spaced apart at the end of the cover plate 30. Then, the steel shell is bent so that it covers the end of the cover plate 30. When bending the steel shell, the steel shell compresses the first sealing part 40 and the second sealing part 50, causing the first sealing part 40 and the second sealing part 50 to deform, thereby sealing the gap between the steel shell and the cover plate 30. Since the first sealing part 40 and the second sealing part 50 are spaced apart, the space between the first sealing part 40 and the second sealing part 50 provides a buffer space for the compression deformation of the first sealing part 40 and the second sealing part 50, thereby reducing the pressure exerted on the end of the cover plate 30 by the first sealing part 40 and the second sealing part 50 during the deformation process.

[0033] Specifically, a deformation space 60 is formed between the spaced-apart first sealing part 40 and second sealing part 50. The deformation space 60 between them can serve as an elastic release area for the first sealing part 40 and second sealing part 50 in the compression direction, providing a buffer path for the elastic deformation and lateral expansion of the first sealing part 40 and second sealing part 50. Under this structure, the deformation of the first sealing part 40 and second sealing part 50 after being subjected to external pressure is partially released into the deformation space 60, thereby significantly reducing the reaction force acting on the cover plate 30. This avoids the large rebound force generated by the first sealing part 40 and second sealing part 50 due to space constraints being directly transmitted to the cover plate 30, preventing the cover plate 30 and its explosion-proof valve from deforming due to force, and ensuring the normal opening and closing function and structural stability of the explosion-proof valve.

[0034] The dual-sealing structure significantly improves the sealing reliability of the battery. The first sealing part 40 and the second sealing part 50 form independent sealing paths with the cover plate 30 and the outer shell 20, respectively. Even if one of the seals fails, the other can still effectively prevent electrolyte leakage or intrusion of external impurities, improving overall airtightness and safety redundancy.

[0035] In this embodiment, the materials of the first sealing part 40 and the second sealing part 50 can be EPDM rubber, fluororubber, nitrile rubber, silicone rubber, etc.

[0036] In one feasible implementation, see [reference] Figure 3 The second surface 42 includes a first sub-surface 421 and a second sub-surface 422. The second sub-surface 422 is fitted to the cover plate 30, and the first sub-surface 421 and the second sealing part 50 are disposed opposite to each other. The fourth surface 52 includes a third sub-surface 521 and a fourth sub-surface 522. The fourth sub-surface 522 is fitted to the cover plate 30, and the third sub-surface 521 is disposed opposite to the first sub-surface 421. A deformation space 60 is formed between the third sub-surface 521, the first sub-surface 421, the outer shell 20, and the cover plate 30.

[0037] In practical applications, the second sub-surface 422 and the fourth sub-surface 522 are attached to the cover plate 30 to ensure that an effective contact interface is formed between the sealing part and the cover plate 30, thus ensuring the sealing function. The first sub-surface 421 and the third sub-surface 521 are arranged opposite to each other, becoming the two relative boundaries of the deformation space 60. This allows the sealing part to preferentially undergo elastic deformation in the direction of the deformation space 60 when it is compressed. The deformation space 60 is formed by the oppositely arranged first sub-surface 421 and the third sub-surface 521 forming its inner wall to create a controlled deformation path. Therefore, when the sealing part is subjected to compressive force, its material will deform along the line connecting the first sub-surface 421 and the third sub-surface 521, thereby further preventing the sealing part from undergoing excessive deformation in the direction of the cover plate 30 due to structural instability, and preventing the cover plate 30 from being subjected to uneven force or warping.

[0038] Further, see Figure 3 The cover plate 30 includes a fifth surface 31, a sixth surface 32 and a seventh surface 33, which are connected in sequence. The fifth surface 31 is connected to the second sub-surface 422, and the seventh surface 33 is connected to the fourth sub-surface 522. The sixth surface 32 faces the deformation space 60. The outer shell 20, the sixth surface 32, the third sub-surface 521 and the first sub-surface 421 surround and form the deformation space 60.

[0039] Further, see Figure 3 and Figure 2 In the thickness direction of the cover plate 30, the thickness of the deformation space 60 is A1, the distance between the fifth surface 31 and the seventh surface 33 is A2, and 0.2≤A1 / A2≤0.9.

[0040] In practical applications, by setting the ratio of A1 / A2 between 0.2 and 0.9, the deformation space 60 is ensured to have sufficient thickness to provide adequate elastic buffering, while avoiding weakening the covering strength or causing the sealing part to lack support due to an excessively large ratio. This allows for precise control of the stress release path and deformation capacity during the sealing and extrusion process. At this time, both the second sub-surface 422 and the fourth sub-surface 522 are connected to a portion of the sixth surface 32. That is, in the extension direction of the sixth surface 32, the first sealing part 40 protrudes from the fifth surface 31, and the second sealing part 50 protrudes from the seventh surface 33. The protruding parts can clamp the cover plate 30 in a direction perpendicular to the sixth surface 32, thereby limiting the first sealing part 40 and the second sealing part 50 and preventing the first sealing part 40 or the second sealing part 50 from shifting during the steel shell forming process. When A1 / A2 < 0.2, the deformation space 60 is too small, resulting in insufficient buffer space for the first sealing part 40 and the second sealing part 50 during compression deformation. This can easily lead to stress acting directly on the cover plate 30, causing deformation of the cover plate 30 or the explosion-proof valve. When A1 / A2 > 0.9, the deformation space 60 occupies most of the thickness, which may result in insufficient clamping force for the first sealing part 40 and the second sealing part 50, making the sealing path unstable and affecting the airtightness and overall structural tightness.

[0041] Optionally, see Figure 4 and Figure 5 A first space 70 is formed between the portion of the first surface 41 near the deformation space 60 and the outer shell 20, and the first space 70 and the deformation space 60 are connected. In the direction perpendicular to the thickness of the cover plate 30, the width of the first space 70 is B1, the width of the deformation space 60 is B3, and 0 < B1 / B3 ≤ 0.3.

[0042] In practical applications, the first space 70 is located between the first sealing part 40 and the outer shell 20, and this space is connected to the deformation space 60, thereby forming multiple buffer zones in different directions. This allows the first sealing part 40 to move freely in multiple directions under external force, thus more effectively distributing pressure in multiple directions between the outer shell 20 and the cover plate 30. This design makes the first sealing part 40 more adaptable under unrestricted conditions, able to evenly distribute external stress, reduce the pressure of the first sealing part 40 on the cover plate 30 in one direction, and reduce the risk of local deformation or damage due to uneven force on the end of the cover plate 30.

[0043] Optionally, refer to Figure 4 and Figure 5 A second space 80 is formed between the portion of the third surface 51 near the deformation space 60 and the outer shell 20, and the second space 80 and the deformation space 60 are connected. In the direction perpendicular to the thickness of the cover plate 30, the width of the second space 80 is B2, the width of the deformation space 60 is B3, and 0 < B2 / B3 ≤ 0.3.

[0044] In practical applications, the second space 80 is located between the first sealing part 40 and the outer shell 20, and this space is connected to the deformation space 60, thereby forming multiple buffer zones in different directions. This allows the second sealing part 50 to move freely in multiple directions under external force, thus more effectively distributing pressure in multiple directions between the outer shell 20 and the cover plate 30. This design makes the second sealing part 50 more adaptable under unrestricted conditions, able to evenly distribute external stress, reduce the pressure of the second sealing part 50 on the cover plate 30 in one direction, and reduce the risk of local deformation or damage due to uneven force on the end of the cover plate 30.

[0045] In one feasible implementation, refer to Figure 6 The second surface 42 is attached to the cover plate 30. The first surface 41 includes a fifth sub-surface 411 and a sixth sub-surface 412. The sixth sub-surface 412 is attached to the outer shell 20. The fifth sub-surface 411 is disposed between the sixth sub-surface 412 and the second surface 42, and the fifth sub-surface 411 faces the outer shell 20. The third surface 51 is attached to the outer shell 20. The fourth surface 52 includes a third sub-surface 521 and a fourth sub-surface 522. The fourth sub-surface 522 is attached to the cover plate 30, and the third sub-surface 521 faces the outer shell 20. The third sub-surface 521, the fifth sub-surface 411, the outer shell 20, and the cover plate 30 enclose a deformation space 60.

[0046] In practical applications, when the first sealing part 40 and the second sealing part 50 begin to deform, they both deform towards the outer shell 20 until the third sub-surface 521 and the fifth sub-surface 411 are facing each other. Afterward, the first sealing part 40 and the second sealing part 50 continue to deform until the third sub-surface 521 and the fifth sub-surface 411 are in contact. The deformation space 60 is formed by the third sub-surface 521, the fifth sub-surface 411, the outer shell 20, and the cover plate 30. This multi-directional structural arrangement allows pressure to be transmitted and dispersed in multiple directions, avoiding excessive compression in one direction, thereby improving the deformation capacity of the sealing part. This multi-directional pressure dispersion effectively reduces the risk of deformation of the cover plate 30, ensuring the normal opening and closing function of the explosion-proof valve.

[0047] In one feasible implementation, refer to Figure 2 The first sealing part 40 or the second sealing part 50 includes a base 53 and a casting part 54. A portion of the base 53 is sandwiched between the cover plate 30 and the outer shell 20. The casting part 54 is located at the end of the base 53 away from the outer shell 20. A clearance space 90 is formed between the casting part 54 and the outer shell 20.

[0048] In practical applications, the casting section 54 is usually a sprue structure in the injection molding process, which has relatively low mechanical strength and is prone to breakage or damage when subjected to large pressure. By placing the casting section 54 at the end of the base 53 away from the outer casing 20, it can be kept away from the direct molding area of ​​the outer casing 20, avoiding being squeezed by the outer casing 20 during battery encapsulation, thereby significantly reducing the risk of damage to the casting section 54 due to stress.

[0049] Furthermore, during battery assembly, the outer casing 20 is typically wrapped around the cover plate 30 and pressed tightly to seal the sealing portion by bending or rolling. During this process, the outer casing 20 may partially indent inwards. If insufficient space is left between the outer casing 20 and the casting portion 54, it is prone to compression and collision with the casting portion 54 during molding. By providing a clearance space 90 between the outer casing 20 and the casting portion 54, a accommodating area is provided for the indentation deformation of the outer casing 20, avoiding direct contact or interference between the outer casing 20 and the casting portion 54, and preventing damage to the casting portion 54.

[0050] 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 certain specific posture. If the specific posture changes, the directional indicator will also change accordingly.

[0051] 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.

[0052] 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.

[0053] 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, characterized in that, include: Cover plate; A housing, the housing being disposed around the end of the cover plate; A first sealing portion includes a first surface and a second surface. The first sealing portion is sandwiched between the cover plate and the outer shell. At least a portion of the first surface is in contact with the outer shell, and at least a portion of the second surface is in contact with the cover plate. The second sealing part includes a third surface and a fourth surface. The second sealing part is sandwiched between the cover plate and the outer shell and is spaced apart from the first sealing part. At least a portion of the third surface is in contact with the outer shell, and at least a portion of the fourth surface is in contact with the cover plate. The outer shell, the first sealing part, the cover plate, and the second sealing part form a deformable space.

2. The battery according to claim 1, characterized in that, The second surface includes a first sub-surface and a second sub-surface, the second sub-surface is fitted to the cover plate, and the first sub-surface and the second sealing part are disposed opposite to each other; The fourth surface includes a third sub-surface and a fourth sub-surface. The fourth sub-surface is attached to the cover plate. The third sub-surface and the first sub-surface are disposed opposite to each other. The deformation space is formed between the third sub-surface, the first sub-surface, the outer shell, and the cover plate.

3. The battery according to claim 2, characterized in that, The cover plate includes a fifth, a sixth, and a seventh surface, which are connected in sequence. The fifth surface is connected to the second sub-surface, and the seventh surface is connected to the fourth sub-surface. The sixth surface faces the deformation space. The outer shell, the sixth surface, the third sub-surface, and the first sub-surface enclose the deformation space.

4. The battery according to claim 3, characterized in that, In the thickness direction of the cover plate, the thickness of the deformation space is A1, the distance between the fifth surface and the seventh surface is A2, and 0.2≤A1 / A2≤0.

9.

5. The battery according to claim 2, characterized in that, A first space is formed between the portion of the first surface near the deformation space and the outer shell, and the first space and the deformation space are connected.

6. The battery according to claim 5, characterized in that, In the direction perpendicular to the thickness of the cover plate, the width of the first space is B1, and the width of the deformation space is B3, where 0 < B1 / B3 ≤ 0.

3.

7. The battery according to claim 2, characterized in that, A second space is formed between the portion of the third surface near the deformation space and the outer shell, and the second space is connected to the deformation space.

8. The battery according to claim 7, characterized in that, In the direction perpendicular to the thickness of the cover plate, the width of the second space is B2, the width of the deformation space is B3, and 0 < B2 / B3 ≤ 0.

3.

9. The battery according to claim 1, characterized in that, The second surface is fitted to the cover plate. The first surface includes a fifth sub-surface and a sixth sub-surface. The sixth sub-surface is fitted to the outer shell. The fifth sub-surface is disposed between the sixth sub-surface and the second surface and faces the outer shell. The third surface is attached to the outer shell, the fourth surface includes a third sub-surface and a fourth sub-surface, the fourth sub-surface is attached to the cover plate, the third sub-surface faces the outer shell, and the third sub-surface, the fifth sub-surface, the outer shell and the cover plate surround to form the deformation space.

10. The battery according to any one of claims 1 to 9, characterized in that, The first sealing part or the second sealing part includes a base and a casting part, a portion of the base is sandwiched between the cover plate and the outer shell, the casting part is disposed at the end of the base away from the outer shell, and a clearance space is formed between the casting part and the outer shell.

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