Battery top cover and battery

Abstract

The utility model provides a kind of battery top cover and battery, wherein battery top cover includes: arch part.Arch part is shaped in the surface of battery top cover along first direction convexity;Arch part is equipped with recess;The top end of arch part convexity on the surface of battery top cover is located outside recess.By setting arch part, when integrating battery top cover on battery, external pressure or internal pressure of battery can be converted into the compressive stress borne on arch part, and the form of arch reduces the stress concentration of local area on arch part, and compressive stress is distributed more dispersed on arch part, and recess is not set in the most remote end position of arch part convexity on the surface of battery top cover, further avoid that recess place concentrates and bears stress, so that recess place on arch part is not easy to crack due to stress concentration, and the risk of cracking at recess place when cylindrical top cover is used normally can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery top cover and a battery. Background Technology

[0002] Cylindrical and prismatic batteries typically have grooves (usually grooves) formed on their top covers using laser etching or mechanical stamping. The thickness of the grooved area is significantly reduced. When the internal pressure of the battery casing reaches a threshold, the grooves preferentially fracture, forming a pressure relief channel; in other words, the grooves on the top cover function as an explosion-proof valve. In related technologies, during battery use, the internal pressure fluctuates, and the area near the grooves experiences changing stress. This stress variation can easily cause fatigue cracks in the material near the grooves to gradually propagate, leading to top cover cracking and unnecessary opening of the pressure relief channel, thus affecting the battery's lifespan. Utility Model Content

[0003] The present invention provides a battery top cover and a battery, which can improve the technical problem of battery top covers being prone to cracking.

[0004] In a first aspect, embodiments of the present invention provide a battery top cover, comprising:

[0005] An arched portion protrudes along a first direction and is formed on the surface of the battery top cover;

[0006] The arched portion has a groove; the top of the arched portion protruding from the surface of the battery top cover is located outside the groove.

[0007] In one embodiment, the depth of the groove satisfies the following relationship:

[0008] h = (1-k)t;

[0009] In the formula, h represents the depth of the groove; t represents the thickness of the portion of the arch that forms the groove; and k has a value range of 0.03 < k < 0.2.

[0010] In one embodiment, the width and depth of the groove satisfy the following relationship:

[0011] 0.8 ≤ w / h ≤ 3;

[0012] Where w represents the width of the groove.

[0013] In one embodiment, the groove wall forming the groove by the arched portion includes: a side wall section and a bottom wall section;

[0014] The bottom wall section is recessed into the surface of the arched portion, and the bottom wall section is located between the two oppositely arranged side wall sections.

[0015] In one embodiment, the groove wall further includes:

[0016] An arc-shaped segment connects the sidewall segment and the bottom wall segment;

[0017] The radius of the arc segment satisfies the following relationship:

[0018] 0.05t≤r≤0.5t;

[0019] In the formula, r represents the radius of the arc segment; t represents the thickness of the portion of the arch that forms the groove.

[0020] In one embodiment, the arched portion has an inclined section that protrudes and is inclinedly formed on the surface of the battery top cover;

[0021] The inclined segment extends along the curve; the inclination angle between the inclined segment and the surface of the battery top cover ranges from 25° to 70°.

[0022] In one embodiment, the battery top cover has an arched groove; the surface of the arched portion defines at least a portion of the groove wall; the arched groove forms an opening at one end away from the top of the arched portion along the first direction.

[0023] In one embodiment, the battery top cover further includes:

[0024] The rotating part is adapted to form the surface of the battery top cover;

[0025] Wherein, the arched portion protrudes along the first direction and is formed on the rotating portion; the rotating portion is recessed at the arched portion to form the arched groove;

[0026] The depth of the arched groove satisfies the following relationship:

[0027] 0.05≤H / D≤0.20;

[0028] In the formula, H represents the depth of the arched groove; D represents the maximum diameter of the rotating part.

[0029] In one embodiment, the arch is configured as a rotating structure formed about a central axis; the groove is configured as an annular groove surrounding the central axis.

[0030] Secondly, embodiments of the present invention provide a battery, including the battery top cover as described above.

[0031] In one embodiment, the battery further includes:

[0032] The housing is fixedly connected to one end of the battery top cover along the first direction;

[0033] The arched portion protrudes from the end of the battery top cover away from the housing along the first direction; the groove is formed on the surface of the arched portion away from the housing along the first direction.

[0034] The beneficial effects of the embodiments of this utility model are as follows:

[0035] In the embodiments of this utility model, by setting an arched portion, when the battery top cover is integrated onto the battery, the external or internal pressure of the battery can be converted into compressive stress on the arched portion. The arched form reduces stress concentration in local areas on the arched portion, and the compressive stress is more dispersed on the arched portion. Furthermore, the groove is not located at the farthest point of the arched portion protruding from the surface of the battery top cover, further avoiding stress concentration at the groove. In this way, the groove on the arched portion is less likely to crack due to stress concentration, which can reduce the risk of cracking at the groove during normal use of the battery top cover, thereby improving the technical problem of poor service life of cylindrical top covers in related technologies. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments 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 these drawings without creative effort.

[0037] Figure 1 This is a perspective view of the battery top cover provided in an embodiment of the present utility model;

[0038] Figure 2 yes Figure 1 A perspective sectional view of the battery top cover shown;

[0039] Figure 3 yes Figure 1 A plan sectional view of the battery top cover shown;

[0040] Figure 4 yes Figure 3 A magnified view of a portion of point A in the middle.

[0041] Explanation of reference numerals in the attached figures:

[0042] 100. Battery top cover; 100a. Lower surface;

[0043] 110. Arched section; 111. Groove; 111a. Side wall section; 111b. Bottom wall section; 111c. Arc-shaped section; 112. Inclined section;

[0044] 120. Installation Department;

[0045] 130. Rotating part;

[0046] 140. Rotary structure;

[0047] 150. Arched groove;

[0048] L1, axis of rotation; L2, center axis. Detailed Implementation

[0049] 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 skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0050] Reference Figures 1 to 4 As shown, the battery top cover 100 provided by this utility model can be used as at least part of a battery, such as a cylindrical battery or a prismatic battery. The battery top cover 100 includes an arched portion 110.

[0051] The arched portion 110 protrudes along the first direction and is formed on the surface of the battery top cover 100. Figures 1 to 4 In the specific implementation shown in the illustration, the first direction is the up and down direction shown in the figure. The arched part 110 protrudes upward from the lower surface 100a of the battery top cover 100. When the battery top cover 100 is integrated on the battery, the battery casing is fixed below the battery top cover 100. Due to the setting of the arched part 110, the surface area of ​​the battery top cover 100 is increased compared with the flat top cover surface. When the internal pressure of the casing changes, each part of the arched part 110 bears stress relatively evenly.

[0052] The arched portion 110 is provided with a groove 111, which reduces the thickness of the arched portion 110 at the groove 111. When the internal pressure of the battery is too high, the groove 111 of the arched portion 110 is more likely to crack, forming a pressure relief channel to ensure the safety of battery use. The groove 111 is located at the end of the arched portion 110 furthest from the surface of the battery top cover 100 along the first direction; that is, the top of the arched portion 110 protruding from the surface of the battery top cover 100 is located outside the groove 111. (Refer to...) Figure 2 and Figure 3In the specific implementation of the example, this arrangement ensures that the groove 111 is not located at the furthest point from the lower surface 100a of the top cover along the vertical direction of the arched portion 110. It is understood that the uppermost part of the arched portion 110 bears a relatively large stress along the illustrated direction. The above arrangement results in relatively less stress on the portion of the arched portion 110 that forms the groove 111. Under normal use, the groove 111 of the arched portion 110 is less prone to cracking.

[0053] By adopting the above solution, when the battery top cover 100 is integrated onto the battery, the external or internal pressure of the battery can be converted into compressive stress on the arched portion 110. The arched shape reduces stress concentration in local areas on the arched portion 110, and the compressive stress is more dispersed on the arched portion 110. Furthermore, the groove 111 is not located at the farthest point of the arched portion 110 protruding from the surface of the battery top cover 100, further avoiding stress concentration at the groove 111. In this way, the groove 111 on the arched portion 110 is less likely to crack due to stress concentration, which can reduce the risk of cracking at the groove 111 during normal use of the cylindrical top cover, thereby improving the technical problem of poor service life of cylindrical top covers in related technologies.

[0054] The groove 111 on the arched portion 110 helps improve battery life. In a further embodiment, some dimensions of the groove 111 affect the usability of the battery top cover 100. For example, the depth of the groove affects the thickness of the arched portion 110 at the groove 111. By limiting the depth of the groove, it can be ensured that the arched portion 110 can crack and release pressure when the internal pressure of the battery is too high, while preventing the arched portion 110 from cracking during normal battery use. Specifically, the depth of the groove satisfies the following relationship:

[0055] h = (1-k)t;

[0056] In the formula, h represents the depth of the groove; t represents the thickness of the portion of the arched part 110 that forms the groove 111; and the value of k ranges from 0.03 to 0.2.

[0057] exist Figure 3 In a specific implementation of the example, the battery top cover 100 is configured as a body of rotation about a rotation axis L1. Figure 3 A cross-sectional view of the battery top cover 100 is shown on a plane of rotation s passing through the axis of rotation L1. Figure 3 and Figure 4In this context, the depth h of the groove is defined as the maximum distance from the bottom wall of the groove 111 to the outer surface of the arch 110, and the thickness t of the portion of the arch 110 forming the groove 111 represents the thickness of the area of ​​the arch 110 outside the groove 111 that is not thinned by the groove 111. By defining the depth of the groove and the thickness of the arch 110 through the above relationship, the effectiveness of the battery top cover 100 can be ensured.

[0058] The width of the groove can also affect the lifespan of the battery cover 100. For example, if the groove width is too small and the groove depth is too large, the cross-sectional shape of the groove 111 will be slit-like, and the stress at the bottom wall of the groove 111 will be more concentrated, making it prone to cracking. If the groove width is too large, the space occupied by the groove 111 at the arched portion 110 will be larger, limiting the structural strength of the arched portion 110. (Refer to...) Figure 3 and Figure 4 As shown, in some embodiments, the width and depth of the groove satisfy the following relationship:

[0059] 0.8 ≤ w / h ≤ 3;

[0060] Where w represents the width of the groove. By relating the width w of the groove to the depth h of the groove, the overall size of the groove 111 is prevented from excessively affecting the structural strength of the arched portion 110. At the same time, the arched portion 110 is less likely to crack at the groove 111 during normal battery use, further ensuring the performance of the battery top cover 100.

[0061] In some embodiments, the groove wall of the arched portion 110 forming the groove 111 includes: a side wall segment 111a and a bottom wall segment 111b. The bottom wall segment 111b is recessed into the surface of the arched portion 110 to define a groove depth between the bottom wall segment 111b and the surface of the arched portion 110 where it connects to the groove wall of the groove 111; the bottom wall segment 111b is located between two opposing side wall segments 111a to define a groove width between the opposing side wall segments 111a. It is understood that, referring to... Figure 4 As shown, the matching method of the side wall section 111a and the bottom wall section 111b makes the cross section of the groove wall of the groove 111 U-shaped. This arrangement makes the bottom wall of the groove 111 flat or curved. Compared with the bottom wall of the groove 111 being linear or dotted, the stress at the groove 111 is more dispersed, which helps to prevent the arched part 110 from cracking at the groove 111 when the battery is in normal use.

[0062] In some embodiments, refer to Figure 4 As shown, the groove wall of the groove 111 also includes an arc-shaped segment 111c. The arc-shaped segment 111c connects the side wall segment 111a and the bottom wall segment 111b, that is, the side wall segment 111a and the bottom wall segment 111b are connected by an arc surface to improve the structural strength of the connection between the side wall segment 111a and the bottom wall segment 111b.

[0063] In the specific design, the radius of the arc segment satisfies the following relationship:

[0064] 0.05t≤r≤0.5t;

[0065] In the formula, r represents the radius of the arc segment. It is understandable that when the radius of the arc segment is too large relative to the thickness of the portion of the arched portion 110 forming the groove 111, the edge strength of the bottom wall of the groove 111 is too high. When the internal pressure of the battery is too high, the area near the groove 111 may not crack properly to form a pressure relief channel. Conversely, when the radius of the arc segment is too small relative to the thickness of the portion of the arched portion 110 forming the groove 111, the junction of the side wall segment 111a and the bottom wall segment 111b may crack during normal battery use due to stress concentration. By limiting the radius of the arc segment, the advantage of a more dispersed stress distribution at the U-shaped groove 111 is further ensured.

[0066] In some embodiments, the arched portion 110 has an inclined section 112 that protrudes and is inclinedly formed on the surface of the battery top cover 100, that is, the arched portion 110 extends inclinedly on the surface of the battery top cover 100 at least in the area where it connects with other parts of the battery top cover 100, so that the stress distribution of the arched portion 110 is more uniform or dispersed at least in the area where it connects with other parts of the battery top cover 100.

[0067] The inclined section 112 extends along the curve, allowing for a smooth transition between the inclined section 112 and other parts of the battery top cover 100, further reducing stress concentration in local areas of the arched portion 110. Specifically, the inclination angle α between the inclined section 112 and the surface of the battery top cover 100 ranges from 25° to 70°. This design enhances the structural strength of the battery top cover 100 through the protruding arched portion 110 while avoiding stress concentration in local areas of the arched portion 110, resulting in superior mechanical properties for the arched portion 110.

[0068] In some embodiments, the battery top cover is provided with an arched groove 150, and the surface of the arched portion 110 defines at least a portion of the groove wall of the arched groove 150, that is, the arched groove 150 is formed at the arched portion 110. An opening is formed at one end of the arched groove away from the top end of the arched portion 110 along a first direction. Providing the arched groove 150 at the arched portion 110 can reduce the wall thickness at the arched portion 110 to reduce material costs. At the same time, the arched groove 150 can increase the surface area of ​​the battery top cover 100, which is beneficial to enhance the load-bearing capacity, thereby ensuring the structural strength of the battery top cover 100 while reducing material costs.

[0069] As a specific embodiment, the battery top cover 100 further includes a rotating portion 130. The rotating portion 130 is adapted to form the surface of the battery top cover 100. Specifically, the rotating portion 130 can be configured as the main body of the battery top cover 100, and an arched portion 110 is formed on the rotating portion 130. Specifically, the arched portion 110 protrudes from the rotating portion 130 along a first direction, and the rotating portion 130 has a recessed arched groove 150 formed at the arched portion 110. More specifically, the depth of the arched groove satisfies the following relationship:

[0070] 0.05≤H / D≤0.20;

[0071] In the formula, H represents the depth of the arched groove; D represents the maximum diameter of the rotating part 130. It is understood that when the battery top cover 100 is assembled to form a battery, the battery top cover 100 is fixed to the battery casing by welding or other methods. The arched part 110 helps absorb the stress transmitted to the battery top cover 100 during assembly. By limiting the ratio of the depth of the arched groove to the maximum diameter of the rotating part 130, the arched part 110 has sufficient volume relative to the rotating part 130 to ensure the structural strength of the arched part 110. During the assembly of the battery top cover 100 as part of the battery, the arched part 110 has sufficient structural strength to absorb the stress transmitted to the battery top cover 100 during assembly. Simultaneously, the height of the arched part 110 is limited by the radial dimension of the rotating part 130, resulting in a reasonable space occupation for the arched part 110. This reduces the risk of cracking during the manufacturing process of the battery top cover 100 through stamping or other methods, ensuring the production yield of the battery top cover 100.

[0072] As a specific solution, when the battery top cover 100 is integrated into the battery, the arched groove 150 can be configured to communicate with the interior of the housing, that is, the side of the rotating part 130 with the arched groove 150 is set close to the housing, so that the arched part 110 protruding relative to the rotating part 130 will not occupy too much space inside the housing.

[0073] Understandably, the arrangement of the rotating part 130 also facilitates the matching of the shape of the battery top cover 100 with other parts of the battery, so as to integrate the battery top cover 100 for use on batteries such as cylindrical batteries.

[0074] In some embodiments, the arched portion 110 is configured as a rotary structure 140 formed around a central axis L2, that is, the arched portion 110 can be arranged around the central axis L2. In a specific embodiment, the central axis L2 can be reused as the rotation center line of the rotary portion 130. The groove 111 is configured as an annular groove surrounding the central axis L2. After the battery top cover 100 is integrated onto the battery, when the internal pressure of the battery is too high, the arrangement of the annular groove helps to make the groove wall of the groove 111 respond more quickly to the change in the internal pressure of the battery and crack in time, ensuring the safety of battery use.

[0075] An embodiment of this utility model also provides a battery, including the battery top cover 100 described above. This battery has the beneficial effects of the battery top cover 100, which will not be elaborated further here. As a specific solution, the battery can be, for example, a cylindrical battery, a prismatic battery, etc. A cylindrical battery is preferred.

[0076] In some embodiments, the battery further includes a housing. The housing is fixedly connected to one end of the battery top cover 100 along a first direction. It is understood that the housing is the outer casing mentioned above.

[0077] In the specific design, the arched portion 110 protrudes from the end of the battery top cover 100 away from the housing along the first direction, so that the arched portion 110 occupies less internal space of the housing.

[0078] In a more specific embodiment, the groove 111 is formed on the surface of the arched portion 110 away from the housing along the first direction. When the internal pressure inside the battery housing is too high and the groove wall of the groove 111 cracks to form a pressure relief channel, this arrangement ensures that when the groove wall of the groove 111 cracks to form a pressure relief channel and is deformed by the internal pressure of the housing, it will not be blocked by the area near the cracked position of the groove wall of the groove 111, thus preventing the pressure relief channel from being closed, and ensuring that the battery can normally relieve pressure through the cracked position.

[0079] As a specific embodiment, the battery top cover 100 includes a mounting portion 120. The mounting portion 120 is used to engage with the housing to fix the battery top cover 100 to the battery housing. The specific connection method between the mounting portion 120 and the housing is, for example, welding, riveting, etc., which is not limited in this invention.

[0080] In the specific design, the installation part is located on the periphery of the arched part 110.

[0081] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A battery top cover (100), characterized in that, include: An arched portion (110) protrudes along a first direction and is formed on the surface of the battery top cover (100); The arched portion (110) is provided with a groove (111); the top of the arched portion (110) protruding from the surface of the battery top cover (100) is located outside the groove (111).

2. The battery top cover (100) according to claim 1, characterized in that, The depth of the groove (111) satisfies the following relationship: h = (1-k)t; In the formula, h represents the depth of the groove (111); t represents the thickness of the portion of the arch (110) that forms the groove (111); and the value of k ranges from 0.03 to 0.

2.

3. The battery top cover (100) according to claim 2, characterized in that, The width and depth of the groove (111) satisfy the following relationship: 0.8 ≤ w / h ≤ 3; Where w represents the width of the groove (111).

4. The battery top cover (100) according to claim 1, characterized in that, The arched portion (110) forming the groove (111) includes a side wall section (111a) and a bottom wall section (111b); The bottom wall segment (111b) is recessed into the surface of the arched portion (110) and is located between the two oppositely arranged side wall segments (111a).

5. The battery top cover (100) according to claim 4, characterized in that, The groove wall of the groove (111) also includes: An arc-shaped segment (111c) connects the side wall segment (111a) and the bottom wall segment (111b); The radius of the arc segment (111c) satisfies the following relationship: 0.05t≤r≤0.5t; In the formula, r represents the radius of the arc segment; t represents the thickness of the portion of the arched part (110) that forms the groove (111).

6. The battery top cover (100) according to any one of claims 1 to 5, characterized in that, The arched portion (110) has an inclined section (112) that protrudes and is inclinedly formed on the surface of the battery top cover (100); The inclined segment (112) extends along the curve; the inclination angle between the inclined segment (112) and the surface of the battery top cover (100) ranges from 25° to 70°.

7. The battery top cover (100) according to any one of claims 1 to 5, characterized in that, The battery top cover is provided with an arched groove (150); the surface of the arched portion (110) defines at least a portion of the groove wall of the arched groove (150); the arched groove forms an opening at one end away from the top of the arched portion (110) along the first direction.

8. The battery top cover (100) according to claim 7, characterized in that, The battery top cover (100) also includes: The rotating part (113) is adapted to form the surface of the battery top cover (100); The arched portion (110) protrudes from the rotating portion (113) along the first direction; the rotating portion (113) recesses into the arched portion (110) to form the arched groove (150); The depth of the arched groove satisfies the following relationship: 0.05≤H / D≤0.20; In the formula, H represents the depth of the arched groove; D represents the maximum diameter of the rotating part (113).

9. The battery top cover (100) according to any one of claims 1 to 5, characterized in that, The arched portion (110) is configured as a rotating structure (113) formed about a central axis (L2); the groove (111) is configured as an annular groove surrounding the central axis (L2).

10. A battery, characterized in that, Includes the battery top cover (100) as described in any one of claims 1-9.

11. The battery according to claim 10, characterized in that, The battery also includes: The housing is fixedly connected to one end of the battery top cover (100) along the first direction; The arched portion (110) protrudes along the first direction from one end of the battery top cover (100) away from the housing; the groove (111) is formed on the surface of the arched portion (110) away from the housing along the first direction.

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