Cover plate assembly and battery cell

Abstract

The application relates to the technical field of batteries and discloses a cover plate assembly and a battery cell. The cover plate assembly comprises a cover plate body provided with a mounting hole, and a first surface is formed on one side of the cover plate body along a height direction; a reinforcing rib is arranged on the first surface and is spaced apart from the mounting hole; the reinforcing rib comprises adjacent convex ribs and grooves; the convex ribs and the grooves extend along a first direction; the two sides of each convex rib along a second direction are respectively connected with grooves; the first direction is a length direction of the cover plate body; the second direction is a width direction of the cover plate body; the convex ribs protrude from the first surface along the height direction, and a first end surface is formed on the side of each convex rib away from the first surface along the height direction; the width of the first end surface along the second direction is w2; the grooves are recessed from the part of the area on the first surface along the height direction; the width of the groove bottom along the second direction is w3; and the relationship between w2 and w3 satisfies the formula: 0.8 <= w3 / (w2 / 2) <= 1.3. The structural strength of the cover plate body is improved.

Description

Technical Field

[0001] This invention relates to the field of battery technology, specifically to cover plate assemblies and battery cells. Background Technology

[0002] The cover assembly is a crucial component of the battery cell, comprising the cover body and integrated structures such as electrode posts and explosion-proof valves. The cover assembly is used for assembly and welding with the housing to encapsulate the electrode group within the housing. When the battery cell is exposed to vibration and shock, the cover assembly is subjected to significant shear force impacts. If the cover body's strength is insufficient, it can lead to failure in weak areas such as the welded joints between the cover and the housing. Existing cover bodies are typically flat, resulting in poor structural strength. Increasing the thickness of the cover body to improve structural strength would increase material costs and weight, consequently increasing the cost and weight of the battery cell, hindering the achievement of lightweight battery cell design. Summary of the Invention

[0003] In view of this, the present invention provides a cover plate assembly and a battery cell to solve the problems of poor structural strength, high cost and weight of the cover plate body.

[0004] In a first aspect, the present invention provides a cover plate assembly, comprising: a cover plate body having a mounting hole, wherein a first surface is formed on one side of the cover plate body along the height direction; a reinforcing rib located on the first surface and spaced apart from the mounting hole, the reinforcing rib including adjacently arranged protruding ribs and grooves, both the protruding ribs and the grooves extending along a first direction, the grooves being connected to both sides of the protruding ribs along a second direction, wherein the first direction is the length direction of the cover plate body and the second direction is the width direction of the cover plate body; the protruding ribs protruding from the first surface along the height direction, and a first end face being formed on the side of the protruding ribs away from the first surface along the height direction, the width of the first end face along the second direction being w2; the grooves being formed by a portion of the first surface recessed along the height direction, the width of the bottom of the groove along the second direction being w3, wherein w2 and w3 satisfy the relationship: 0.8≤w3 / (w2 / 2)≤1.3.

[0005] Beneficial effects: By setting reinforcing ribs on the surface of the cover plate body, and the reinforcing ribs are composed of convex ribs and two grooves on both sides of the convex ribs, the alternating concave and convex structure effectively strengthens the structural strength of the cover plate body. Compared with the traditional method of increasing the strength by increasing the thickness of the cover plate body, it can effectively reduce the material used in the cover plate body, thereby saving costs and reducing the weight of the cover plate body. Furthermore, by limiting the width w2 of the convex rib and the width w3 of the groove to satisfy the condition that w3 / (w2 / 2) is within the range of 0.8 to 1.3, insufficient material flow during stamping is avoided, and defects such as cracks after forming are avoided, ensuring the smooth forming and reliability of the reinforcing ribs, so that the reinforcing ribs can effectively strengthen the structural strength of the cover plate body.

[0006] In one optional embodiment, the width w2 of the first end face along the second direction is in the range of 0.4mm≤w2≤10mm;

[0007] And / or, the width w3 of the groove bottom along the second direction is in the range of 0.1 mm ≤ w3 ≤ 10 mm.

[0008] Beneficial effects: By limiting w2 to a value within the range of 0.4 mm to 10 mm, it is possible to ensure that the rib has sufficient strength, thereby effectively strengthening the structural strength of the cover plate body and improving the reliability of the cover plate assembly. It is also possible to avoid the phenomenon of insufficient material flow during the stamping process due to excessive material required for rib forming, thus ensuring that the reinforcing rib can be formed smoothly and improving the production yield.

[0009] By limiting w3 to a value within the range of 0.1 mm to 10 mm, the groove has a reasonable width. This avoids the problems of the punch being too narrow and easily worn when processing the groove, thus improving the service life of the punch and the forming accuracy of the groove. It also ensures the smooth forming of the groove and the rib, avoiding defects such as cracks, thereby improving product quality and production yield.

[0010] In one optional embodiment, the recess depth of the groove along the height direction is h3, and the vertical distance between the bottom of the groove and the first end face along the height direction is h4, wherein h3 and h4 satisfy the relationship: 0.2≤h3 / h4≤0.8.

[0011] Beneficial effects: By limiting the values ​​of h3 / h4 to the range of 0.2 to 0.8, it is possible to ensure the smooth formation of the reinforcing ribs and to ensure that the reinforcing ribs can provide sufficient reinforcement to the cover plate body.

[0012] In one optional embodiment, the recess depth h3 of the groove along the height direction is in the range of 0.3mm≤h3≤5mm;

[0013] And / or, the vertical distance h4 between the first end face and the bottom of the groove along the height direction is in the range of 0.5 mm ≤ h4 ≤ 10 mm.

[0014] Beneficial effects: By limiting h3 to a value between 0.3 mm and 5 mm, the groove has a reasonable depth, which can ensure the smooth forming of the reinforcing rib and improve the forming quality, and also ensure that the reinforcing rib has a sufficient strengthening effect on the structural strength of the cover plate body.

[0015] And / or, by limiting h4 to a value within the range of 0.5 mm to 10 mm, it is possible to ensure that the rib has sufficient strength, thereby effectively strengthening the structural strength of the cover plate body and improving the reliability of the cover plate assembly, while also ensuring that the rib can be smoothly formed, thereby improving production efficiency and product quality.

[0016] In one optional embodiment, the first end face is connected to the bottom of the groove via a first sidewall, and the dihedral angle between the first sidewall and the bottom of the groove is x, wherein 100°≤x≤170°;

[0017] And / or, the groove further has a second sidewall disposed opposite to the first sidewall along a second direction, the dihedral angle between the second sidewall and the bottom of the groove being y, wherein 95°≤y≤150°.

[0018] Beneficial effects: By limiting x to a value between 100° and 170°, the first sidewall and the bottom of the groove are set at an obtuse angle, which can ensure the smooth forming of the rib and thus the smooth processing of the reinforcing rib. It can also avoid the reinforcing rib occupying too much space on the cover plate body along the second direction, thus ensuring that there is enough space on the cover plate body to set the reinforcing rib and avoiding affecting the arrangement of structures such as mounting holes on the cover plate body.

[0019] And / or, by limiting the dihedral angle y between the second sidewall and the bottom of the groove to a value within the range of 95° to 150°, it is possible to ensure smooth demolding of the mold after stamping, avoid scratching the second sidewall during demolding, avoid stress concentration at the groove, reduce cracking, and thus improve processing quality. It is also possible to prevent excessive material from flowing along the second sidewall away from the rib during stamping, ensuring that enough material flows to the rib so that the rib can be formed smoothly, thereby ensuring the smooth processing and forming of the reinforcing rib and improving product yield.

[0020] In one alternative embodiment, the thickness of the cover plate body along the height direction is h1, and the difference between the thickness of the cover plate body and the recess depth of the groove is h2, wherein h1 and h2 satisfy the relationship: 0.6≤h2 / h1<1.

[0021] Beneficial effects: By limiting h2 / h1 to be greater than or equal to 0.6 and less than 1, it can be ensured that the cover plate body has grooves, so that the reinforcing ribs are composed of both convex ribs and grooves, ensuring the smooth forming of the convex ribs and ensuring the reinforcing effect of the reinforcing ribs on the structural strength of the cover plate body. At the same time, it can avoid the grooves being too deep, which would result in the corresponding solid part on the cover plate body being too thin. This avoids the structural strength of the cover plate body being too low due to the grooves being too deep, thus reducing the probability of the cover plate body deforming during assembly or use and ensuring the safety of the cover plate assembly.

[0022] In one optional implementation, the value range of h1 is: 0.5 mm ≤ h1 ≤ 10 mm; and / or, the value range of h2 is: 0.8 mm ≤ h2 ≤ 10 mm.

[0023] Beneficial effects: By limiting h1 to a value within the range of 0.5 mm to 10 mm, it is possible to ensure that the cover plate body has sufficient structural strength, improve the reliability and safety of the cover plate assembly, avoid material waste, reduce manufacturing costs and weight, and facilitate the lightweighting of the battery cell.

[0024] And / or, by limiting h2 to a value within the range of 0.8 mm to 10 mm, it can be ensured that the cover plate body has a reasonable remaining solid thickness after the groove is opened. This can ensure the structural strength of the cover plate body, as well as the smooth forming of the groove and the rib, and improve the reinforcing effect of the rib on the cover plate body, thereby improving the overall performance and safety of the cover plate assembly.

[0025] In one optional embodiment, the number of mounting holes is multiple, the multiple mounting holes are spaced apart along a first direction, the cover plate body includes two first side edges arranged opposite each other along a second direction, the number of reinforcing ribs is two, the two reinforcing ribs are respectively arranged on both sides of the mounting holes along the second direction, and the reinforcing ribs and the first side edges are spaced apart along the second direction.

[0026] And / or, along the second direction, the distance between the reinforcing rib and the mounting hole is w1, wherein the value of w1 is in the range of 2 mm ≤ w1 ≤ 30 mm.

[0027] Beneficial effects: By setting multiple mounting holes spaced apart along the first direction and extending the reinforcing ribs along the first direction, the extension direction of the reinforcing ribs is the same as the arrangement direction of the multiple mounting holes, and the reinforcing ribs are located between the mounting holes and the first side, which can effectively improve the structural strength of the cover plate body near the mounting holes, and facilitate the setting and processing of the reinforcing ribs, which is conducive to improving production efficiency.

[0028] And / or, by limiting w1 to a value between 2 mm and 30 mm, a reasonable spacing between the reinforcing rib and the mounting hole is achieved. This ensures that the reinforcing rib effectively strengthens the area around the mounting hole, improving the overall structural strength and durability of the cover plate assembly. It also avoids stress concentration, ensuring the smooth forming of the cover plate body 1 and improving the reliability of the cover plate assembly.

[0029] Secondly, the present invention also provides a battery cell, comprising: a housing having an open end; an electrode assembly disposed within the inner cavity of the housing; and the aforementioned cover plate assembly, the cover plate assembly covering the open end of the housing. Since the battery cell includes the cover plate assembly and has the same effect as the cover plate assembly, it will not be described in detail here.

[0030] In one alternative embodiment, the first surface of the cover body is disposed facing the inner cavity of the housing, or the first surface of the cover body is disposed away from the inner cavity of the housing.

[0031] Beneficial effects: The first surface of the cover plate body is set facing the inner cavity of the shell, so that the reinforcing ribs face the inner cavity of the shell. The protruding ribs and grooves are all enclosed inside the shell, which can avoid damage to the reinforcing ribs by the external structure and ensure the reinforcing effect of the reinforcing ribs on the cover plate body; or, the first surface of the cover plate body is away from the inner cavity of the shell, so that the reinforcing ribs face the outer side of the shell. This can also enhance the structural strength of the cover plate body and avoid the reinforcing ribs occupying the internal space of the shell, which facilitates the arrangement of structures such as pole groups inside the shell. Attached Figure Description

[0032] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 This is a top view of a cover plate assembly according to an embodiment of the present invention;

[0034] Figure 2 for Figure 1 A structural schematic diagram of the cover plate assembly as shown from a bottom view;

[0035] Figure 3 for Figure 2 A magnified view of part A in the diagram;

[0036] Figure 4 for Figure 1 The front view of the cover plate assembly shown;

[0037] Figure 5 for Figure 4 Cross-sectional view along the BB direction;

[0038] Figure 6 for Figure 5 A magnified view of part of C;

[0039] Figure 7 This is a front view of a battery cell according to an embodiment of the present invention;

[0040] Figure 8 for Figure 7 A cross-sectional view along the DD direction;

[0041] Figure 9 for Figure 8 A magnified view of part of E in the diagram.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1. Cover plate body; 101. First surface; 102. Mounting hole; 111. First side; 2. Reinforcing rib; 201. Raised rib; 2011. First end face; 2012. First side wall; 202. Groove; 2021. Groove bottom; 2022. Second side wall; 3. Housing; 4. Electrode assembly; 5. Electrode post; 6. Explosion-proof valve; 7. Liquid injection hole. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] Lithium-ion cells are a commonly used type of battery cell. With the increasing maturity of lithium-ion cell technology, they are widely used as power batteries in electric vehicles and energy storage, leading to increasingly stringent requirements for performance and safety. The cover assembly includes a cover body 1 and integrated components such as electrode posts 5, explosion-proof valves 6, injection holes 7, lower plastic, and upper plastic on the cover body 1. The cover assembly seals the electrode group 4 internally by welding the cover body 1 and the shell 3. The lower plastic (PP material) holds the electrode group 4 in place. After the battery is packaged in a vehicle, it experiences prolonged vibration and jolting, which can cause significant shear force impact on the cover area. Insufficient strength of the cover body 1 can lead to failure in weak areas such as the explosion-proof valve 6 and the welded joints of the shell cover. Therefore, the cover needs sufficient structural strength. Current technologies use flat covers with relatively poor structural strength. Increasing the cover thickness is typically used to improve structural strength, but this also increases the material cost and weight of the cover, consequently increasing the cost and weight of the battery cell.

[0046] The following is combined Figures 1 to 9 The following describes embodiments of the present invention.

[0047] According to embodiments of the present invention, in one aspect, a cover plate assembly is provided, such as... Figures 1 to 6 As shown, the cover plate assembly includes: a cover plate body 1 and reinforcing ribs 2. The cover plate body 1 has mounting holes 102, and a first surface 101 is formed on one side of the cover plate body 1 along its height direction. The reinforcing ribs 2 are located on the first surface 101 and spaced apart from the mounting holes 102. Each reinforcing rib 2 includes adjacent protruding ribs 201 and grooves 202, both extending along a first direction. Grooves 202 are connected to both sides of the protruding ribs 201 along a second direction. The first direction is the length direction of the cover plate body 1, and the second direction is the width direction of the cover plate body 1. The rib 201 protrudes from the first surface 101 along the height direction, and the side of the rib 201 facing away from the first surface 101 along the height direction forms a first end face 2011. The width of the first end face 2011 along the second direction is w2. The groove 202 is formed by a portion of the first surface 101 recessed along the height direction. The width of the bottom 2021 of the groove 202 along the second direction is w3. The relationship between w2 and w3 is: 0.8 ≤ w3 / (w2 / 2) ≤ 1.3. The units of w2 and w3 are both mm. The first direction, the second direction, and the height direction are three intersecting directions on the cover plate body 1. Preferably, the first direction, the second direction, and the height direction are perpendicular to each other. Optionally, the height direction refers to... Figures 4 to 9 The "height direction" indicated by the middle arrow refers to the first direction. Figures 1 to 3 The first direction indicated by the middle arrow, the second direction refers to... Figures 1 to 3 , Figures 5 to 6 The middle arrow points to the "second direction".

[0048] It should be noted that the cover plate body 1 of this embodiment is stamped from a plate-shaped raw material to form a rib 201 and a groove 202. The rib 201 and the groove 202 together form a reinforcing rib 2. There is at least one reinforcing rib 2. Each reinforcing rib 2 includes one rib 201 and two grooves 202. The two grooves 202 are respectively disposed on both sides of the rib 201 along the second direction. During the stamping process, the material on the plate at the position corresponding to the groove 202 is squeezed out. At least a portion of the material squeezed out at each groove 202 flows towards the position of the rib 201 and becomes part of the material of the rib 201. Along the extension direction of the reinforcing rib 2 (i.e., the first direction), the length dimension of the rib 201 is equal to the length dimension of the groove 202. In the second direction perpendicular to the extension direction of the reinforcing rib 2, the width of the end face of the rib 201 is... Let w2 be the width of the groove bottom 2021 of the groove 202 and w3 be the width of the groove bottom 2021. If w3 / (w2 / 2) is less than 0.8, the width of the groove 202 is too small relative to the width of the rib 201. During stamping, too little material is squeezed out from the groove 202, resulting in insufficient material flow and insufficient material flow to allow the rib 201 to be formed smoothly. This can easily cause insufficient dimensions of the rib 201 along the height direction or unevenness of the first end face 2011 of the rib 201. If w3 / (w2 / 2) is greater than 1.3, the width of the groove 202 is too large relative to the width of the rib 201. During stamping, too much material needs to be squeezed out from the groove 202, exceeding the material required for the rib 201 to be formed. This can easily lead to defects such as cracks after forming. It can be seen that if the value of w3 / (w2 / 2) is too large or too small, it will lead to insufficient material flow during stamping, and the reinforcing rib 2 will be difficult to process and form.

[0049] The cover plate assembly of this embodiment uses reinforcing ribs 2 on the surface of the cover plate body 1. The reinforcing ribs 2 are composed of convex ribs 201 and two grooves 202 on both sides of the convex ribs 201. The alternating convex and concave structure effectively strengthens the structural strength of the cover plate body 1. Compared with the traditional method of increasing the strength by increasing the thickness of the cover plate body 1, the material used in the cover plate body 1 can be effectively reduced, thereby saving costs and reducing the weight of the cover plate body 1. Furthermore, by limiting the width w2 of the convex ribs 201 and the width w3 of the grooves 202 to satisfy the condition that w3 / (w2 / 2) is within the range of 0.8 to 1.3, insufficient material flow during stamping is avoided, and defects such as cracks after forming are avoided. This ensures the smooth forming and reliability of the reinforcing ribs 2, so that the reinforcing ribs 2 can effectively strengthen the structural strength of the cover plate body 1.

[0050] Optionally, the value of w3 / (w2 / 2) is any one of 0.8, 0.9, 1.0, 1.1, 1.2, 1.3 or a value between any two of these values.

[0051] In one embodiment, the width w2 of the first end face 2011 along the second direction ranges from 0.4 mm to w2 to 10 mm. It should be noted that the first end face 2011 is the end face of the rib 201 furthest from the first surface 101, and the width of the first end face 2011 is the minimum width of the rib 201 at all positions along the height direction. If w2 is less than 0.4 mm, the width of the rib 201 is too small, resulting in insufficient structural strength. When the cover plate body 1 is under stress, the rib 201 is prone to cracking and cannot effectively improve the structural strength of the cover plate body 1. If w2 is greater than 10 mm, the width of the rib 201 is too large, requiring too much material. During the stamping process of the reinforcing rib 2, the material flow is insufficient, making it difficult to process and shape the reinforcing rib 2. Therefore, by limiting w2 to a value within the range of 0.4 mm to 10 mm, it is possible to ensure that the rib 201 has sufficient strength, so that the reinforcing rib 2 can effectively strengthen the structural strength of the cover plate body 1 and improve the reliability of the cover plate assembly. At the same time, it is possible to avoid the phenomenon of insufficient material flow during the stamping process due to excessive material required for the forming of the rib 201, thereby ensuring that the reinforcing rib 2 can be formed smoothly and improving the production yield.

[0052] Optionally, the value of w2 is any one of 0.4 mm, 0.5 mm, 1 mm, 2 mm, 5 mm, 8 mm, 10 mm, or a value between any two of these values.

[0053] In one embodiment, the width w3 of the groove bottom 2021 along the second direction of the groove 202 is in the range of 0.1 mm ≤ w3 ≤ 10 mm. It should be noted that the groove bottom 2021 is the bottom surface of the groove 202 on the side facing away from the first surface 101 along the height direction, and the width w3 of the groove bottom 2021 along the second direction is the minimum width of the groove 202 at various positions along the height direction. If w3 is less than 0.1 mm, the width of the groove 202 is too small, the forming punch used to shape the groove 202 during the stamping process is too narrow, the forming punch is prone to wear, has a short service life, and the shape accuracy of the groove 202 stamped by the worn forming punch is poor. If w3 is greater than 10 mm, the width of the groove 202 is too large, the material flow is insufficient during the stamping process, the reinforcing rib 2 is difficult to form, and defects such as cracks are easily generated. Therefore, by limiting w3 to a value within the range of 0.1 mm to 10 mm, the groove 202 has a reasonable width. This avoids the problem of the forming punch being too narrow and easily worn when processing the groove 202, thus improving the service life of the punch and the forming accuracy of the groove 202. It also ensures the smooth forming of the groove 202 and the rib 201, avoiding defects such as cracks, thereby improving product quality and production yield.

[0054] Optionally, the value of w3 is any one of 0.1 mm, 0.5 mm, 1 mm, 3 mm, 5 mm, 8 mm, 10 mm, or a value between any two of these values.

[0055] In one embodiment, further combination Figure 9 As shown, the recess depth of groove 202 along the height direction is h3, and the vertical distance along the height direction between the bottom 2021 of groove 202 and the first end face 2011 is h4. h3 and h4 satisfy the relationship: 0.2 ≤ h3 / h4 ≤ 0.8. It should be noted that during the stamping process of the reinforcing rib 2, at least a portion of the material extruded from the groove 202 flows towards the position between the two grooves 202, thereby extruding and forming the rib 201. h3 is the vertical distance along the height direction between the bottom 2021 of groove 202 and the first surface 101, and h4 is the distance the rib 201 protrudes relative to the bottom 2021 of groove 202, which is the total height of the rib 201 along the height direction. If h3 / h4 is less than 0.2, then in the height direction, the recess depth of groove 202 relative to the rib 201... If the height of rib 201 is too small, the groove 202 cannot provide enough material for the forming of the rib 201, resulting in insufficient material flow during stamping and making it difficult to form the rib. If h3 / h4 is greater than 0.8, the depth of the groove 202 is too large relative to the height of the rib 201 in the height direction, and the dimension of the groove 202 along the height direction is too large, resulting in a thinner remaining solid part on the cover plate body 1 after removing the groove 202, leading to poor structural strength. If the dimension of the rib 201 along the height direction is too small, the structural reinforcement of the cover plate body 1 is not significant. Therefore, by limiting the value of h3 / h4 to the range of 0.2 to 0.8, it is possible to ensure the smooth forming of the reinforcing rib 2 and to ensure that the reinforcing rib 2 can provide sufficient reinforcement to the cover plate body 1.

[0056] Optionally, the value of h3 / h4 is any one of 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8 or a value between any two of them.

[0057] In one embodiment, the recess depth h3 of the groove 202 along the height direction ranges from 0.3 mm to h3 to 5 mm. It should be noted that h3 is the groove depth of groove 202. If h3 is less than 0.3 mm, the groove depth of groove 202 is too small. During the stamping process, there is insufficient material squeezed out from groove 202, resulting in insufficient material flow and insufficient material to provide enough material for the forming of rib 201. Rib 201 is difficult to form, and therefore the reinforcing rib 2 is difficult to form. If h3 is greater than 5 mm, the groove depth of groove 202 is too large, resulting in insufficient residual thickness of the part of the cover plate body 1 corresponding to groove 202 along the height direction. This excessively damages the structural strength of cover plate body 1. Furthermore, excessive groove depth of groove 202 will cause the root of rib 201 (i.e., the end of rib 201 away from the first end face 2011 along the height direction) to be too far from the first surface 101, resulting in weak connection strength between rib 201 and cover plate body 1, and insignificant reinforcement effect on cover plate body 1. Therefore, by limiting h3 to a value between 0.3 mm and 5 mm, the groove 202 is guaranteed to have a reasonable groove depth, which can not only ensure the smooth forming of the reinforcing rib 2 and improve the forming quality, but also ensure that the reinforcing rib 2 has a sufficient strengthening effect on the structural strength of the cover plate body 1.

[0058] Optionally, the value of h3 is any one of 0.3 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, or a value between any two of these values.

[0059] In one embodiment, the vertical distance h4 between the first end face 2011 and the bottom of the groove 2021 along the height direction ranges from 0.5 mm to 10 mm. It should be noted that h4 is the vertical distance along the height direction between the first end face 2011 of the rib 201 and the root of the rib 201, i.e., the height of the rib 201. If h4 is less than 0.5 mm, the height of the rib 201 is too small and cannot effectively improve the structural strength of the cover plate body 1; if h4 is greater than 10 mm, the height of the rib 201 is too large, resulting in poor structural stability and easy deformation, which also cannot effectively improve the structural strength of the cover plate body 1. Furthermore, the forming of the rib 201 requires too much material. During the stamping process of the reinforcing rib 2, excessive material may lead to uneven material flow, affecting the forming quality of the reinforcing rib 2 and making the forming process more difficult. Therefore, by limiting h4 to a value within the range of 0.5 mm to 10 mm, it is possible to ensure that the rib 201 has sufficient strength, so that the reinforcing rib 2 can effectively strengthen the structural strength of the cover plate body 1 and improve the reliability of the cover plate assembly. It is also possible to ensure that the reinforcing rib 2 can be formed smoothly, thereby improving production efficiency and product quality.

[0060] Optionally, the value of h4 is any one of 0.5 mm, 1 mm, 2 mm, 3 mm, 5 mm, 8 mm, 10 mm, or a value between any two of these values.

[0061] In one embodiment, further combination Figure 6 As shown, the first end face 2011 and the groove bottom 2021 are connected by the first side wall 2012. The dihedral angle between the first side wall 2012 and the groove bottom 2021 is x, where 100°≤x≤170°. It should be noted that the first side wall 2012 and the groove bottom 2021 are set at an obtuse angle. The first side wall 2012 connects the first end face 2011 of the rib 201 and the groove bottom 2021 of the groove 202. Therefore, the first side wall 2012 is both the outer side wall of the rib 201 and the inner side wall of the groove 202. With a fixed width of the groove bottom 2021, the smaller the angle between the first side wall 2012 and the groove bottom 2021, the larger the width of the first end face 2011 of the rib 201, the larger the volume of the rib 201, and the more material is required for the rib 201 during stamping. If x is less than 100°, then the first end face 2011 of the rib 201 is larger, the first end face 2011 is wider, the volume of the rib 201 is larger, and the more material is required for the rib 201 during stamping. If the angle between one side wall 2012 and the bottom of the groove 2021 is too small, the volume of the rib 201 will be too large, the material required for forming the rib 201 will be too much, the material flow will be insufficient during stamping, the rib 201 will not be able to be extruded, and the processing will be difficult to form. If x is greater than 170°, the width of the orthographic projection of the first side wall 2012 on the plane where the first surface 101 is located along the second direction will be too large, the distance between the bottom of the groove 2021 and the first end face 2011 along the second direction will be too large, the total size of the reinforcing rib 2 composed of the groove 202 and the rib 201 along the second direction will be too large, the space occupied will be too large, and the space on the cover plate body 1 will be insufficient.

[0062] Therefore, by limiting x to a value between 100° and 170°, the first sidewall 2012 and the bottom of the groove 2021 are set at an obtuse angle. This ensures the smooth forming of the rib 201, thereby ensuring the smooth processing and forming of the reinforcing rib 2. It also avoids the reinforcing rib 2 occupying too much space on the cover plate body 1 along the second direction, thus ensuring that there is enough space on the cover plate body 1 to arrange the reinforcing rib 2 and avoiding affecting the arrangement of structures such as the mounting holes 102 on the cover plate body 1.

[0063] Optionally, the value of x is any one of 100°, 110°, 120°, 130°, 140°, 150°, 160°, 170° or a value between any two of these values.

[0064] In one embodiment, the groove 202 further has a second sidewall 2022 disposed opposite to the first sidewall 2012 along a second direction, and the dihedral angle between the second sidewall 2022 and the groove bottom 2021 is y, wherein 95°≤y≤150°. It should be noted that the groove 202 is stamped by a stamping die (contouring punch). If y is less than 95°, the dihedral angle between the second sidewall 2022 and the groove bottom 2021 is too small, which makes it difficult to demold after stamping. It is easy to scratch the second sidewall 2022 during demolding, affecting the processing quality, and it will also cause stress concentration at the groove 202, making it prone to cracking. If y is greater than 150°, the dihedral angle between the second sidewall 2022 and the groove bottom 2021 is too large. During stamping, the material extruded from the groove 202 tends to flow towards the second sidewall 2022 and is not easy to concentrate and flow to the middle of the two grooves 202, making it difficult to extrude the rib 201 and making it difficult to form the reinforcing rib 2.

[0065] Therefore, by limiting the dihedral angle y between the second sidewall 2022 and the groove bottom 2021 to a range of 95° to 150°, a reasonable angle is maintained between the second sidewall 2022 and the groove bottom 2021. This ensures smooth mold demolding after stamping, avoids scratching the second sidewall 2022 during demolding, and prevents stress concentration at the groove 202, reducing cracking and improving processing quality. It also prevents excessive material from flowing along the second sidewall 2022 away from the rib 201 during stamping, ensuring sufficient material flow to the rib 201 for smooth forming, thus guaranteeing the smooth processing and forming of the reinforcing rib 2 and improving product yield. It should be noted that the two grooves 202 in the same reinforcing rib 2 are symmetrically arranged on both sides of the rib 201.

[0066] Optionally, the value of y is any one of 95°, 105°, 115°, 125°, 135°, 145°, 150° or a value between any two of these values.

[0067] In one embodiment, further combination Figure 9As shown, along the height direction, the thickness of the cover plate body 1 is h1, and the difference between the thickness of the cover plate body 1 and the recess depth of the groove 202 is h2. The relationship between h1 and h2 is: 0.6 ≤ h2 / h1 < 1. It should be noted that h1 is the thickness of the cover plate body 1. The difference h2 between the thickness of the cover plate body 1 and the recess depth of the groove 202 along the height direction refers to the thickness of the remaining solid portion of the cover plate body 1 after removing the groove 202. If h2 / h1 is less than 0.6, the thickness of the remaining solid portion is too small relative to the thickness of the cover plate body 1, meaning the recess depth of the groove 202 is too large. This significantly reduces the strength of the cover plate body 1, making it prone to deformation during assembly or use, thus affecting the safety of the cover plate assembly. If h2 / h1 is equal to or greater than 1, then the groove 202 does not exist on the cover plate body 1, which does not meet the design requirements and cannot effectively strengthen the structural strength of the cover plate body 1.

[0068] Therefore, by limiting h2 / h1 to be greater than or equal to 0.6 and less than 1, it can be ensured that the cover plate body 1 has a groove 202, so that the reinforcing rib 2 is composed of the convex rib 201 and the groove 202, ensuring the smooth forming of the convex rib 201 and ensuring the reinforcing effect of the reinforcing rib 2 on the structural strength of the cover plate body 1. At the same time, it can also avoid the groove 202 being too deep, which would result in the thickness of the solid part on the cover plate body 1 corresponding to the groove 202 being too small. This avoids the groove 202 being too deep, which would result in the structural strength of the cover plate body 1 being too small, thus reducing the probability of deformation of the cover plate body 1 during assembly or use and ensuring the safety of the cover plate assembly.

[0069] Optionally, the value of h2 / h1 is any one of 0.6, 0.7, 0.8, 0.9, 0.95, 0.99 or a value between any two of these values.

[0070] In one embodiment, the value of h1 ranges from 0.5 mm to 10 mm. If h1 is less than 0.5 mm, the cover plate body 1 is too thin, resulting in insufficient structural strength and making it prone to deformation during assembly or use, affecting the reliability and safety of the cover plate assembly. If h1 is greater than 10 mm, the cover plate body 1 is too thick, requiring excessive material, increasing manufacturing costs and weight, which is detrimental to achieving lightweight cell design. Therefore, by limiting h1 to a value within the range of 0.5 mm to 10 mm, it is possible to ensure that the cover plate body 1 has sufficient structural strength, improving the reliability and safety of the cover plate assembly, while also avoiding material waste, reducing manufacturing costs and weight, and facilitating the lightweight design of the cell.

[0071] Optionally, the value of h1 is any one of 0.5 mm, 1 mm, 2 mm, 3 mm, 5 mm, 8 mm, 10 mm, or a value between any two of these values.

[0072] In one embodiment, the value of h2 is in the range of 0.8 mm ≤ h2 ≤ 10 mm. If h2 is less than 0.8 mm, the thickness of the remaining solid portion on the cover plate body 1 after removing the groove 202 is too small, that is, the recess depth of the groove 202 is too large relative to the thickness of the cover plate body 1, which will significantly reduce the structural strength of the cover plate body 1 and make it prone to deformation under external force, thereby affecting the overall performance and safety of the cover plate assembly. If h2 is greater than 10 mm, there is no groove 202 on the cover plate body 1, and no material can be provided for the forming of the rib 201. The forming of the rib 201 is difficult and cannot effectively improve the structural strength and reliability of the cover plate assembly. Therefore, by limiting the value of h2 to the range of 0.8 mm to 10 mm, it can be ensured that the cover plate body 1 has a reasonable thickness of the remaining solid portion after the groove 202 is opened. This can ensure both the structural strength of the cover plate body 1 and the smooth forming of the groove 202 and the rib 201, improve the reinforcing effect of the reinforcing rib 2 on the cover plate body 1, and thus improve the overall performance and safety of the cover plate assembly.

[0073] Optionally, the value of h2 is any one of 0.8 mm, 1 mm, 2 mm, 3 mm, 5 mm, 8 mm, 10 mm, or a value between any two of these values.

[0074] In one embodiment, further combination Figure 2 As shown, there are multiple mounting holes 102, which are spaced apart along a first direction. The cover plate body 1 includes two first side edges 111 arranged opposite each other along a second direction. There are two reinforcing ribs 2, which are respectively arranged on both sides of the mounting holes 102 along the second direction, and the reinforcing ribs 2 and the first side edges 111 are spaced apart along the second direction. It should be noted that the mounting holes 102 are through holes opened on the cover plate body 1, and the mounting holes 102 penetrate the cover plate body 1 along the height direction. The mounting holes 102 are suitable for installing components such as poles and explosion-proof valves. The dimension of the cover plate body 1 along the first direction is larger than its dimension along the second direction. The first side edge 111 extends along the first direction, that is, the first side edge 111 is the longer side edge among all the sides of the cover plate body 1. By setting multiple mounting holes 102 spaced apart along the first direction and extending the reinforcing ribs 2 along the first direction, the extension direction of the reinforcing ribs 2 is the same as the arrangement direction of the multiple mounting holes 102, and the reinforcing ribs 2 are located between the mounting holes 102 and the first side 111, which can effectively improve the structural strength of the cover plate body 1 in the area near the mounting holes 102, and facilitate the setting and processing of the reinforcing ribs 2, which is conducive to improving production efficiency.

[0075] Preferably, the orthographic projection of each mounting hole 102 on the first side 111 along the second direction is within the range of the orthographic projection of each reinforcing rib 2 on the first side 111 along the second direction. That is, along the first direction, the extension length of each reinforcing rib 2 can cover the size of the area where all mounting holes 102 are located. Since the structural strength of the location where the mounting holes 102 are opened on the cover plate body 1 and the surrounding area is relatively weak, this design can strengthen the structural strength of the part between each mounting hole 102 and the first side 111 through the reinforcing rib 2, thereby further improving the structural strength and reliability of the cover plate body 1.

[0076] Optionally, the mounting hole 102 includes a pole hole, an explosion-proof valve hole, and an injection hole 7. The cover plate assembly also includes a pole 5 and an explosion-proof valve 6. The pole 5 is installed in the pole hole, the explosion-proof valve 6 is installed in the explosion-proof valve hole, and the injection hole 7 is used to inject electrolyte into the cell. The injection hole 7 is suitable for installing a removable sealing pin.

[0077] In one embodiment, further combination Figure 6 As shown, along the second direction, the distance between the reinforcing rib 2 and the mounting hole 102 is w1, where the value of w1 ranges from 2 mm to 30 mm. It should be noted that w1 is the distance along the second direction between the side edge of the groove 202 near the mounting hole 102 and the edge of the mounting hole 102 near the reinforcing rib 2. Both the mounting hole 102 and the reinforcing rib 2 are formed by stamping. If w1 is less than 2 mm, the distance between the groove 202 of the reinforcing rib 2 and the mounting hole 102 is too close. During the stamping process, the material flow space of the reinforcing rib 2 and the mounting hole 102 overlaps, which may cause stress concentration around the mounting hole 102, affecting the reliability and durability of the cover plate assembly. If w1 is greater than 30 mm, the distance between the reinforcing rib 2 and the mounting hole 102 is too far, weakening the reinforcing effect of the reinforcing rib 2 around the mounting hole 102 and failing to effectively improve the structural strength of the cover plate body 1 near the mounting hole 102.

[0078] Therefore, by limiting w1 to a value between 2 mm and 30 mm, a reasonable distance is achieved between the reinforcing rib 2 and the mounting hole 102. This ensures that the reinforcing rib 2 effectively strengthens the area around the mounting hole 102, improving the overall structural strength and durability of the cover plate assembly. It also avoids stress concentration, ensuring the smooth forming of the cover plate body 1 and improving the reliability of the cover plate assembly.

[0079] Optionally, the value of w1 is any one of 2 mm, 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, or a value between any two of these values.

[0080] The following experiments verify the influence of different parameter values ​​on the processing and forming of the reinforcing ribs 2 on the cover plate body 1. The parameter settings for the embodiments and comparative examples are shown in Table 1. The reinforcing ribs 2 were processed on the plain aluminum plate according to the parameters of each set of embodiments and comparative examples in Table 1, and the corresponding verification results are shown in Table 2. Among them, the plain aluminum plate is the cover plate body structure before the reinforcing ribs 2 are processed.

[0081] Table 1

[0082]

[0083] Table 2

[0084]

[0085] As can be seen from Tables 1 and 2, for Examples 1 to 5, all parameters are within the range defined in this application, and no failure occurred after processing the reinforcing rib 2, that is, the reinforcing rib 2 can be successfully processed and formed, which meets the requirements.

[0086] For Comparative Example 1, the value of w3 / (w2 / 2) is 0.7, which is less than 0.8 and outside the range of 0.8 to 1.3 defined in this application. w3 / (w2 / 2) exceeds the lower limit, resulting in failure in the forming of the aluminum sheet stamping and the rib (i.e., reinforcing rib 2), leading to insufficient height, an uneven bottom surface, and poor strength. For Comparative Example 2, the value of w3 / (w2 / 2) is 1.4, which is greater than 1.3 and outside the range of 0.8 to 1.3 defined in this application. w3 / (w2 / 2) exceeds the upper limit, resulting in defects and cracks in the forming of the aluminum sheet stamping and reinforcing rib 2. Therefore, when w3 / (w2 / 2) is within the range of 0.8 to 1.3 defined in this application, the smooth forming of the reinforcing rib 2 can be guaranteed, as well as the forming quality of the reinforcing rib 2, thus improving the structural strength of the cover plate body 1.

[0087] For Comparative Example 3, the value of h3 / h4 is 0.1, which is less than 0.2 and outside the range of 0.2 to 0.8 defined in this application. Since h3 / h4 is below the lower limit, the forming of the reinforcing rib 2 fails during aluminum sheet stamping, resulting in insufficient height, an uneven bottom surface, and poor strength. Therefore, when h3 / h4 is within the range defined in this application, the successful forming of the reinforcing rib 2 can be guaranteed, as well as its forming quality, thereby improving the structural strength of the cover plate body 1.

[0088] For Comparative Example 4, the value of y is 155°, which is greater than 150° and outside the range of 95° to 150° defined in this application. y exceeds the upper limit, resulting in failure of the forming of the reinforcing rib 2 during the stamping of the plain aluminum sheet. The rib 201 is insufficient, the bottom surface is uneven, and the strength is poor. For Comparative Example 5, the value of x is 98°, which is less than 100° and outside the range of 100° to 170° defined in this application. x exceeds the lower limit, resulting in failure of the forming of the reinforcing rib 2 during the stamping of the plain aluminum sheet. The height is insufficient, the bottom surface is uneven, and the strength is poor. It is evident that when x or y is outside the range defined in this application, it will affect the successful forming and quality of the reinforcing rib 2.

[0089] It should be noted that the "insufficient height" mentioned above refers to the insufficient height h4 of the rib 201 along the height direction; "uneven bottom surface" refers to the unevenness of the first end face 2011 of the rib 201.

[0090] In summary, when the stiffener 2 adopts the parameter range defined in this embodiment, it can ensure the smooth processing and forming of the cover plate body 1 and the stiffener 2, and ensure the processing quality of the stiffener 2, which is beneficial to improving the structural strength of the cover plate body 1 through the stiffener 2.

[0091] In this embodiment, the cover plate assembly reduces the thickness of the cover plate body 1 while strengthening its structural strength by setting reinforcing ribs 2 on the cover plate body 1. This achieves lightweighting and reduces material costs. Furthermore, by limiting the design parameters of the reinforcing ribs 2, the smooth molding of the reinforcing ribs 2 and the reliability of the structure are ensured, thereby improving the production yield of the production line.

[0092] According to an embodiment of the present invention, in another aspect, a battery cell is also provided, such as... Figures 7 to 9 As shown, the battery cell includes: a housing 3, an electrode group 4, and the aforementioned cover assembly. The housing 3 has an open end; the electrode group 4 is disposed within the inner cavity of the housing 3; the cover assembly covers the open end of the housing 3. The terminal post 5 in the cover assembly is electrically connected to the tab on the electrode group 4. Since the battery cell includes the cover assembly, it has the same effect as the cover assembly, and will not be described further here.

[0093] Optionally, the battery cell is a lithium-ion battery cell.

[0094] In one embodiment, such as Figure 9 As shown, the first surface 101 of the cover plate body 1 is arranged facing the inner cavity of the housing 3, so that the reinforcing rib 2 faces the inner cavity of the housing 3. The protruding rib 201 and the groove 202 are both enclosed inside the housing, which can prevent the external structure from damaging the reinforcing rib 2 and ensure the reinforcing effect of the reinforcing rib 2 on the cover plate body 1.

[0095] In other embodiments, the first surface 101 of the cover plate body 1 is disposed away from the inner cavity of the housing 3 (not shown in the figure). The first surface 101 of the cover plate body 1 is disposed away from the inner cavity of the housing 3, so that the reinforcing rib 2 faces the outside of the housing 3. This can also strengthen the structural strength of the cover plate body 1, and can avoid the reinforcing rib 2 occupying the internal space of the housing 3, which facilitates the arrangement of structures such as pole groups inside the housing 3.

[0096] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A cover assembly, characterized by The cover plate body is provided with a mounting hole, and a first surface is formed on one side of the cover plate body along the height direction. The reinforcing rib is located on the first surface and is arranged in a spaced manner with the mounting hole, and the reinforcing rib comprises a convex rib and a groove arranged adjacent to each other, the convex rib and the groove both extend along a first direction, and the convex rib is connected with the groove on both sides along a second direction respectively, wherein the first direction is the length direction of the cover plate body, and the second direction is the width direction of the cover plate body. The convex rib protrudes from the first surface along the height direction, and a first end surface is formed on the side of the convex rib away from the first surface along the height direction, the width of the first end surface along the second direction is w2, the groove is recessed from the part of the area on the first surface along the height direction, and the width of the groove bottom along the second direction is w3, wherein the relationship between w2 and w3 satisfies the formula: 0.8≤w3 / (w2 / 2)≤1.

3. The width w2 of the first end surface along the second direction ranges from 0.4 mm to 10 mm. The width w3 of the groove bottom along the second direction ranges from 0.1 mm to 10 mm. The recess depth h3 of the groove along the height direction ranges from 0.3 mm to 5 mm. The vertical distance h4 between the first end surface and the groove bottom along the height direction ranges from 0.5 mm to 10 mm. The recess depth of the groove along the height direction is h3, and the vertical distance between the groove bottom and the first end surface along the height direction is h4, wherein the relationship between h3 and h4 satisfies the formula: 0.2≤h3 / h4≤0.

8.

2. The cover plate assembly of claim 1, wherein, The first end surface and the groove bottom are connected through a first side wall, and the dihedral angle between the first side wall and the groove bottom is x, wherein 100°≤x≤170°.

3. The cover plate assembly of claim 1, wherein, And / or, the groove further has a second side wall arranged opposite to the first side wall along the second direction, and the dihedral angle between the second side wall and the groove bottom is y, wherein 95°≤y≤150°. Along the height direction, the thickness of the cover plate body is h1, and the difference between the thickness of the cover plate body and the recess depth of the groove is h2, wherein the relationship between h1 and h2 satisfies the formula: 0.6≤h2 / h1<1.

4. The cover plate assembly of claim 1, wherein, The value range of h1 is 0.5 mm≤h1≤10 mm.

5. The cover plate assembly of claim 4, wherein, And / or, the value range of h2 is 0.8 mm≤h2≤10 mm. The number of the mounting holes is multiple, the multiple mounting holes are distributed in a spaced manner along the first direction, the cover plate body comprises two first side edges arranged opposite to each other along the second direction, and the number of the reinforcing ribs is two, the two reinforcing ribs are arranged on both sides of the mounting holes along the second direction, and the reinforcing ribs are arranged in a spaced manner with the first side edges along the second direction.

6. The cover plate assembly of any one of claims 1 to 5, wherein, And / or, along the second direction, the spacing between the reinforcing rib and the mounting hole is w1, wherein the value range of w1 is 2 mm≤w1≤30 mm. The shell has an open end.

7. An electric cell characterized by The pole group is arranged in the inner cavity of the shell. ​ ​ The cover plate assembly of any one of claims 1 to 6, covering an open end of the housing.

8. The electric cell of claim 7, wherein, The first surface of the cover plate body is disposed toward the interior cavity of the housing, or the first surface of the cover plate body is disposed away from the interior cavity of the housing.

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