Battery top cover

Abstract

The invention belongs to the technical field of batteries, and discloses a battery top cover which comprises a plate body assembly and a pole assembly, the plate body assembly is used for covering an opening of a battery cell shell, the direction from the battery cell shell to the plate body assembly is configured to be a first direction, and the plate body assembly comprises a first plate body, a second plate body and a first reinforcing part; the first plate body is perpendicular to the first direction, a reinforcing part is arranged on the edge of the side, facing the first direction, of the first plate body, one side of the second plate body is connected with the reinforcing part, the second plate body inclines in the direction away from the first direction from the side facing the reinforcing part to the side away from the reinforcing part, and the first reinforcing part is connected with the reinforcing part. According to the battery top cover, at least one of the first reinforcing piece and the reinforcing part protrudes in the first direction, a pole assembly penetrates through at least one of the first plate body and the second plate body, the first reinforcing piece protrudes out of the pole assembly in the first direction, and the plate body assembly of the battery top cover is high in structural strength and can also play a role in protecting the pole assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery top cover. Background Art

[0002] A battery cell typically consists of a cell case, a pole group, and a cover plate. The cell case has a connecting opening and a cavity. The pole group is inserted into the cavity through the opening, and the cover plate covers the opening, forming a closed space. Furthermore, a pole post is insulated and sealed through the cover plate. The end of the pole post located inside the cavity is connected to the pole group, and the end of the pole post located outside the cavity is used to connect to the conductive connecting piece of the battery module, thereby achieving an electrically conductive connection between the pole group and the conductive connecting piece.

[0003] The existing cover plate is a flat-plate structure, which causes the end of the pole located outside the cavity to protrude from the surface of the plate. During assembly and transportation processes, the end of the pole located outside the cavity is easily bumped, thereby reducing the safety performance and appearance yield of the battery cell.

[0004] On the other hand, the flat cover plate has a low structural strength, which makes the cover plate easily deformed under stress, thereby reducing the assembly yield of the cover plate and the battery cell shell.

[0005] Therefore, it is urgent to propose a battery top cover to solve the above technical problems. Summary of the Invention

[0006] The object of the present invention is to provide a battery top cover, which can improve the structural strength of the plate assembly to reduce the probability of deformation of the plate assembly. The battery top cover can also protect the pole assembly to reduce the risk of the pole assembly being bumped during the manufacturing process.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] Battery cover, including:

[0009] A plate assembly is provided to cover the opening of the battery cell housing. The direction from the battery cell housing to the plate assembly is configured as a first direction. The plate assembly includes a first plate, a second plate, and a first reinforcement. The first plate is perpendicular to the first direction. A reinforcement is provided on an edge of the first plate facing the first direction. One side of the second plate is connected to the reinforcement. The second plate is inclined in a direction away from the first direction from a side facing the reinforcement to a side facing away from the reinforcement. The first reinforcement is connected to the reinforcement. At least one of the first reinforcement and the reinforcement protrudes along the first direction.

[0010] The pole assembly is provided through at least one of the first plate and the second plate, and the first reinforcement protrudes from the pole assembly along a first direction.

[0011] Optionally, the reinforcement portion is provided with a through hole.

[0012] Optionally, a boss is provided on the hole wall of the through hole, and the first reinforcement is embedded in the through hole and connected to a side of the boss facing the first direction.

[0013] Optionally, the dimension of the boss protruding from the wall of the through hole is W1, the sum of the wall thickness of the reinforcement portion and the dimension of the boss protruding from the wall of the through hole is W2, and 0.95mm≤W2-W1≤1.55mm.

[0014] Optionally, the first reinforcement protrudes along the first direction, and the first reinforcement is provided with a first protective surface and a second protective surface connected to each other on the side facing the first direction. The first protective surface is parallel to the first plate body, and the second protective surface is parallel to the second plate body. The second protective surface is located on the side of the reinforcement facing the second plate body.

[0015] Optionally, a groove is provided on a side of the first reinforcement member facing away from the first direction.

[0016] Optionally, the wall thickness of the first reinforcement is T2, 0.95 mm ≤ T2 ≤ 1.55 mm.

[0017] Optionally, the number of the reinforcing parts, the first reinforcing member and the second plate body are two and they correspond one to one, and the two reinforcing parts are symmetrically arranged about the center of the first plate body.

[0018] Optionally, the plate assembly further includes a second reinforcement member, the reinforcement portion protruding along the first direction, and two opposite sides of the second reinforcement member are respectively connected to the sides of the two reinforcement portions facing each other.

[0019] Optionally, the second reinforcement is connected to the side of the first plate body facing the first direction, and the distance between the side of the second reinforcement body facing the first direction and the side of the first plate body facing the first direction is H1. The pole assembly includes a first pole assembly, and the first pole assembly is passed through the first plate body. The distance between the side of the first pole assembly facing the first direction and the side of the first plate body facing the first direction is H3, 0.07mm≤H3-H1≤0.39mm.

[0020] Beneficial effects of the present invention:

[0021] The first plate is perpendicular to the first direction, and a reinforcement portion is provided on an edge of the first plate facing the first direction. One side of the second plate is connected to the reinforcement portion, and the second plate is inclined from the side facing the reinforcement portion to the side away from the reinforcement portion toward the direction away from the first direction, thereby forming a bending portion at the connection position between the second plate and the reinforcement portion. The bending portion forms a first reinforcement structure on the plate assembly, which has the effect of improving the structural strength of the plate assembly, thereby reducing the probability of deformation problems in the plate assembly, and is beneficial to improving the assembly yield of the plate assembly and the battery cell shell.

[0022] On the other hand, the first reinforcement is connected to the reinforcement part, and at least one of the first reinforcement and the reinforcement part protrudes along the first direction, thereby forming a second reinforcement structure on the plate assembly, which has the effect of improving the structural strength of the plate assembly, thereby reducing the probability of deformation problems in the plate assembly, and is conducive to improving the assembly yield of the plate assembly and the battery cell shell.

[0023] On the other hand, the first reinforcement protrudes from the pole assembly along the first direction, so that the first reinforcement can protect the pole assembly, reduce the chance of the pole assembly being bumped during the manufacturing process, and help improve the safety performance and appearance yield of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the assembly structure of the plate assembly and the battery core shell provided by the present invention;

[0025] Figure 2 This is a schematic diagram of the exploded structure of the battery top cover provided by the present invention;

[0026] Figure 3 It is a structural schematic diagram of the battery top cover provided by the present invention;

[0027] Figure 4 This is a first structural schematic diagram of the plate assembly provided by the present invention;

[0028] Figure 5 is a second structural schematic diagram of the plate assembly provided by the present invention;

[0029] Figure 6 yes Figure 5 Schematic diagram of the E-view structure;

[0030] Figure 7 yes Figure 6 A partial enlarged view of point F in the middle;

[0031] Figure 8 1 is a schematic diagram of the cross-sectional structure of the battery top cover provided by the present invention;

[0032] Figure 9 It is a schematic diagram of the cross-sectional structure of the battery cell provided by the present invention;

[0033] Figure 10 It is a structural schematic diagram of the battery core shell provided by the present invention.

[0034] In the picture:

[0035] D1, first direction;

[0036] 1. Cell shell; 11. First flat section; 12. Slope section; 13. Second flat section; 14. Second fillet; 2. Electrode group; 21. Protrusion;

[0037] 100. Plate assembly; 110. First plate; 111. Reinforcement; 1111. Through hole; 1112. Boss; 120. Second plate; 130. First reinforcement; 131. First protective surface; 132. Second protective surface; 133. Groove; 140. Second reinforcement; 150. Third reinforcement; 160. Support eaves; 170. First fillet; 210. First pole assembly; 211. First plastic part; 212. First rivet block; 213. First base; 214. First column; 220. Second pole assembly; 221. Second plastic part; 222. Second rivet block; 223. Second base; 224. Second column; 231. Third plastic part; 232. Fourth plastic part. DETAILED DESCRIPTION

[0038] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0039] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0040] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0041] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0042] This embodiment provides a battery top cover, which can improve the structural strength of the plate assembly to reduce the probability of deformation of the plate assembly. The battery top cover can also protect the pole assembly to reduce the risk of the pole assembly being bumped during the manufacturing process.

[0043] Specifically, if Figures 1 to 4 As shown, the battery top cover includes a plate assembly 100 and a pole assembly, wherein the plate assembly 100 is used to cover the opening of the battery shell 1 of the battery cell, and the direction from the battery shell 1 to the plate assembly 100 is configured as a first direction D1. The plate assembly 100 includes a first plate 110, a second plate 120 and a first reinforcement 130. The first plate 110 is perpendicular to the first direction D1, and the edge of the first plate 110 facing the first direction D1 is provided with a reinforcement portion 111. The second plate One side of 120 is connected to the reinforcement part 111, and the second plate body 120 is inclined from the side toward the reinforcement part 111 to the side away from the reinforcement part 111 in the direction away from the first direction D1, and the first reinforcement member 130 is connected to the reinforcement part 111, and at least one of the first reinforcement member 130 and the reinforcement part 111 protrudes along the first direction D1. At least one of the first plate body 110 and the second plate body 120 is penetrated by a pole assembly, and the first reinforcement member 130 protrudes from the pole assembly along the first direction D1.

[0044] On the one hand, the first plate body 110 is perpendicular to the first direction D1, and a reinforcement portion 111 is provided on the edge of the first plate body 110 facing the first direction D1. One side of the second plate body 120 is connected to the reinforcement portion 111, and the second plate body 120 is inclined from the side facing the reinforcement portion 111 to the side away from the reinforcement portion 111 in the direction away from the first direction D1, thereby forming a bending portion at the connection position between the second plate body 120 and the reinforcement portion 111. The bending portion forms a first reinforcement structure on the plate body assembly 100, which has the effect of improving the structural strength of the plate body assembly 100, thereby reducing the probability of deformation problems in the plate body assembly 100, which is beneficial to improving the assembly yield of the plate body assembly 100 and the battery cell shell 1.

[0045] On the other hand, the first reinforcement 130 is connected to the reinforcement portion 111, and at least one of the first reinforcement 130 and the reinforcement portion 111 protrudes along the first direction D1, thereby forming a second reinforcement structure on the plate assembly 100, which has the effect of improving the structural strength of the plate assembly 100, thereby reducing the probability of deformation problems in the plate assembly 100, which is beneficial to improving the assembly yield of the plate assembly 100 and the battery cell shell 1.

[0046] On the other hand, the first reinforcement 130 protrudes from the pole assembly along the first direction D1, so that the first reinforcement 130 can protect the pole assembly, reduce the probability of the pole assembly being bumped during the manufacturing process, and is beneficial to improving the safety performance and appearance yield of the battery cell.

[0047] In this embodiment, both the first reinforcement 130 and the reinforcement portion 111 protrude along the first direction D1 to further improve the structural strength of the plate assembly 100 and further reduce the risk of deformation of the plate assembly 100. Of course, in other embodiments, only the first reinforcement 130 may protrude along the first direction D1, or only the reinforcement portion 111 may protrude along the first direction D1. In this embodiment, the reinforcement portion 111 protrudes from the pole assembly along the first direction D1 so that the reinforcement portion 111 can also play a protective role for the pole assembly. In addition, this structure can ensure that the first reinforcement 130 connected to the reinforcement portion 111 protrudes from the pole assembly along the first direction D1, thereby improving the reliability of the protective effect of the first reinforcement 130 on the pole assembly.

[0048] Optionally, the reinforcement portion 111 is provided with a through hole 1111 to reduce the weight of the first plate 110, thereby reducing the weight of the plate assembly 100 and facilitating an increase in the energy density of the battery cell. Furthermore, the reinforcement portion 111 in this embodiment protrudes along the first direction D1. When the first plate 110 is produced using a stretching process, the structure having the through hole 1111 in the reinforcement portion 111 reduces the difficulty of the stretching process compared to a structure without the through hole 1111, thereby improving production efficiency and reducing production costs.

[0049] Furthermore, a boss 1112 is provided on the hole wall of the through hole 1111, and the first reinforcement member 130 is embedded in the through hole 1111, and the first reinforcement member 130 is connected to the side of the boss 1112 toward the first direction D1, so as to realize the connection between the first reinforcement member 130 and the reinforcement part 111 on the basis of maximizing the cross-sectional area of ​​the through hole 1111.

[0050] Furthermore, if Figures 4 to 7As shown, the dimension of the boss 1112 protruding from the wall of the through hole 1111 is W1, and the sum of the wall thickness of the reinforcement 111 and the dimension of the boss 1112 protruding from the wall of the through hole 1111 is W2, 0.95mm≤W2-W1≤1.55mm, and illustratively, W2-W1 can be 0.95mm, 1mm, 1.2mm, 1.3mm, 1.5mm or 1.55mm, among which 1mm≤W2-W1≤1.5mm is preferred. If W2-W1 is less than 0.95mm, the wall thickness of the reinforcement 111 is too thin, which will reduce the structural strength of the reinforcement 111. On the one hand, it reduces the structural strength of the plate assembly 100 and increases the risk of deformation of the plate assembly 100 under stress. On the other hand, since the connection position between the first reinforcement 130 and the first plate 110 is the reinforcement 111, the reduced structural strength of the reinforcement 111 will lead to a reduction in the protection ability of the first reinforcement 130 for the pole assembly, thereby increasing the risk of the pole assembly being bumped during the manufacturing process. If W2-W1 is greater than 1.55mm, the wall thickness of the reinforcement 111 is too large, which will increase the overall weight and volume of the plate assembly 100, not only increasing the production cost, but also reducing the energy density of the battery cell. Secondly, when W2-W1 is greater than 1.55mm, the size of the boss 1112 protruding from the wall of the through hole 1111 is too small, which will reduce the reliability of the connection between the first reinforcement 130 and the boss 1112, thereby reducing the structural strength of the plate assembly 100.

[0051] Alternatively, as Figure 2 and Figure 3 As shown, the first reinforcement member 130 protrudes along the first direction D1. A first protective surface 131 and a second protective surface 132 are connected on the side of the first reinforcement member 130 facing the first direction D1. The first protective surface 131 is parallel to the first plate 110, and the second protective surface 132 is parallel to the second plate 120. The second protective surface 132 is located on the side of the reinforcement portion 111 facing the second plate 120. In other words, the second protective surface 132 points from the side facing the first protective surface 131 to the side facing away from the first protective surface 131, and is inclined away from the first direction D1. The angle of inclination of the second protective surface 132 is the same as the angle of inclination of the second plate 120. This structure forms a bend in the first reinforcement member 130 at the junction of the first protective surface 131 and the second protective surface 132. The formation of the bend improves the structural strength of the first reinforcement member 130, not only further enhancing the structural strength of the plate assembly 100, but also improving the protective capability of the first reinforcement member 130 for the pole assembly. In addition, the second protective surface 132 parallel to the second plate body 120 is located on the side of the reinforcement portion 111 facing the second plate body 120, so that the plate assembly 100 has better structural consistency in the area close to the second plate body 120, greatly reducing the chance of the second protective surface 132 being bumped, and playing a protective role for the first reinforcement member 130.

[0052] Furthermore, if Figure 8 As shown, a groove 133 is provided on the side of the first reinforcement 130 away from the first direction D1 to reduce the weight of the first reinforcement 130 and thus reduce the weight of the board assembly 100, which is beneficial to improving the energy density of the battery cell.

[0053] Furthermore, the wall thickness of the first reinforcement 130 is T2, 0.95mm≤T2≤1.55mm. For example, T2 can be 0.95mm, 1mm, 1.3mm, 1.5mm or 1.55mm, among which 1mm≤T2≤1.5mm is preferred. If T2 is less than 0.95mm, the wall thickness of the first reinforcement 130 is too thin, which will reduce the structural strength of the first reinforcement 130, not only reducing the structural strength of the plate assembly 100, but also reducing the protection ability of the first reinforcement 130 to the pole assembly, increasing the risk of the pole assembly being bumped during the manufacturing process. If T2 is greater than 1.55mm, the wall thickness of the first reinforcement 130 is too large, which will increase the overall weight and volume of the plate assembly 100, not only increasing the production cost, but also reducing the energy density of the battery cell.

[0054] Alternatively, as Figure 8 and Figure 9 As shown, the groove 133 is connected to the through hole 1111, and a protrusion 21 is provided on the side of the electrode group 2 located in the battery cell shell 1 facing the first direction D1. The protrusion 21 is passed through the through hole 1111 and is located in the groove 133, which not only fully utilizes the internal space of the groove 133, but also increases the volume of the electrode group 2, thereby increasing the capacity of the electrode group 2, thereby achieving the effect of improving the energy density of the battery cell.

[0055] It should be noted that when W2-W1>1.55mm, the wall thickness of the reinforcement 111 is too large, which reduces the cross-sectional area of ​​the through-hole 1111. Consequently, the circumferential dimension of the protrusion 21 needs to be reduced to allow the protrusion 21 to pass through the through-hole 1111 and into the groove 133. This reduces the volume of the protrusion 21 and, in turn, the capacity of the electrode group 2. When T2>1.55mm, the wall thickness of the first reinforcement 130 is too large, which reduces the internal space of the groove 133, further reducing the volume of the protrusion 21 and the capacity of the electrode group 2.

[0056] Alternatively, as Figures 2 to 5As shown, the number of reinforcing parts 111, the first reinforcing members 130 and the second plate bodies 120 are all two and correspond one to one. The two reinforcing parts 111 are symmetrically arranged about the center of the first plate body 110. That is to say, the two reinforcing parts 111, the two first reinforcing members 130 and the two second plate bodies 120 are all symmetrically arranged about the center of the first plate body 110. This symmetrical structural design is conducive to reducing the production difficulty of the plate assembly 100 and the assembly difficulty of the plate assembly 100 and the battery cell shell 1, and can also improve the adaptability of the plate assembly 100 and the battery cell shell 1.

[0057] Furthermore, the panel assembly 100 also includes a second reinforcement member 140, the reinforcement portion 111 protrudes along the first direction D1, and the opposite sides of the second reinforcement member 140 are respectively connected to the sides of the two reinforcement portions 111 facing each other, thereby further improving the structural strength of the panel assembly 100 and further reducing the deformation risk of the panel assembly 100.

[0058] Alternatively, as Figure 2 and Figure 8 As shown, the pole assembly includes a first pole assembly 210 and two second pole assemblies 220. The first pole assembly 210 is sealed and insulated and is inserted through the first plate 110. The two second pole assemblies 220 correspond one-to-one with the two second plates 120. Each second pole assembly 220 is sealed and insulated and is inserted through a corresponding second plate 120. A first pole lug and two second pole lugs (the first pole lug and the second pole lug are not shown in the figure) are provided on one side of the pole group 2 facing the first direction D1. The first pole lug is arranged opposite the first pole assembly 210 and is welded to the first pole assembly 210. The two second pole lugs correspond one-to-one with the two second pole assemblies 220. Each second pole lug is welded to a corresponding second pole assembly 220 to achieve conductive connection between the first pole assembly 210 and the second pole assembly 220 and the pole group 2. The first reinforcement member 130 protrudes from the first pole assembly 210 and the second pole assembly 220 along the first direction D1, so that the first reinforcement member 130 protects both the first pole assembly 210 and the second pole assembly 220. Of course, in other embodiments, the second pole assembly 220 may be omitted, and only the first pole assembly 210 may be provided through the first plate 110. Alternatively, the first pole assembly 210 may be omitted, and only the second pole assembly 220 may be provided through the second plate 120.

[0059] Furthermore, the first pole assembly 210 includes a first plastic part 211, a first rivet block 212 and a first pole, wherein the first plastic part 211 and the first rivet block 212 are both located on the side of the first plate 110 facing the first direction D1, and the first plastic part 211 is provided with a first receiving groove on the side facing away from the first plate 110, the first rivet block 212 is embedded in the first receiving groove, and the first rivet block 212 protrudes from the first receiving groove, the first pole includes a first base 213 and a first column 214, the first base The seat 213 is located on a side of the first plate 110 that is away from the first direction D1. The side of the first base 213 that is away from the first plate 110 is used for welding to the first tab. One end of the first column 214 is connected to the first base 213, and the other end is passed through the first plate 110, the first plastic part 211 and the first rivet block 212, and is riveted to the first rivet block 212. The first reinforcement 130 protrudes from the first rivet block 212 in the first direction D1 to reduce the chance of the first rivet block 212 being bumped during the manufacturing process.

[0060] The second pole assembly 220 includes a second plastic part 221, a second rivet block 222 and a second pole, wherein the second plastic part 221 and the second rivet block 222 are both located on the side of the second plate 120 facing the first direction D1, and the second plastic part 221 is provided with a second receiving groove on the side facing away from the second plate 120, and the second rivet block 222 is embedded in the second receiving groove, and the second rivet block 222 protrudes from the second receiving groove. The second pole includes a second base 223 and a second column 224, and the second base 22 3 is located on a side of the second plate 120 facing away from the first direction D1. The side of the second base 223 facing away from the second plate 120 is used for welding to the second tab. One end of the second column 224 is connected to the second base 223, and the other end passes through the second plate 120, the second plastic component 221, and the second rivet block 222, and is riveted to the second rivet block 222. The first reinforcement 130 protrudes from the second rivet block 222 in the first direction D1 to reduce the chance of the second rivet block 222 being bumped during the manufacturing process.

[0061] Optionally, the side of the first rivet block 212 facing the first direction D1 is used to weld to the first connecting piece in the battery module, so that the electrode group 2 is conductively connected to the first connecting piece through the first electrode ear, the first electrode column and the first rivet block 212; the side of the second rivet block 222 facing away from the second plate body 120 is used to weld to the second connecting piece in the battery module, so that the electrode group 2 is conductively connected to the second connecting piece through the second electrode ear, the second electrode column and the second rivet block 222.

[0062] Furthermore, the first reinforcement member 130 protrudes from the first connecting piece along the first direction D1, and the first reinforcement member 130 protrudes from the second connecting piece along the first direction D1. This allows the first reinforcement member 130 to protect the first and second connecting pieces, reducing the chance of the first and second connecting pieces being bumped during the manufacturing process. Furthermore, this structural design saves assembly space for the battery module, helps improve the battery module assembly rate, and thus helps improve the energy density and performance of the battery module while reducing the cost of the battery module.

[0063] Optionally, the side of the first rivet block 212 facing away from the first plate body 110 is parallel to the first plate body 110 to further reduce the probability of the first rivet block 212 being bumped during the manufacturing process, and the side of the second rivet block 222 facing away from the second plate body 120 is parallel to the second plate body 120 to further reduce the probability of the second rivet block 222 being bumped during the manufacturing process.

[0064] Optionally, the first pole assembly 210 and the two second pole assemblies 220 have the same polarity. For example, the first pole assembly 210 and the two second pole assemblies 220 can both be positive pole assemblies or negative pole assemblies. This design can improve the current capacity of the battery top cover, so that the battery top cover can be suitable for the use requirements of high rate and fast charging and discharging of battery cells.

[0065] Alternatively, as Figure 4 and Figure 8As shown, the second reinforcement 140 is connected to the side of the first plate 110 facing the first direction D1, and the distance between the side of the second reinforcement 140 facing the first direction D1 and the side of the first plate 110 facing the first direction D1 is H1, and the distance between the side of the first pole assembly 210 facing the first direction D1 and the side of the first plate 110 facing the first direction D1 is H3. That is, the distance between the side of the first rivet block 212 facing the first direction D1 and the side of the first plate 110 facing the first direction D1 is H3, 0.07mm≤H3-H1≤0.39mm, illustratively, H3-H1 can be 0.07mm, 0.1mm, 0.2mm, 0.3mm, 0.35mm or 0.39mm, among which 0.1mm≤H3-H1≤0.35mm is preferred. If H3 - H1 < 0.07 mm, the side of the first pole assembly 210 facing the first direction D1 that protrudes beyond the side of the second reinforcement 140 facing the first direction D1 is too small. When the first connecting piece is welded to the side of the first pole assembly 210 facing the first direction D1, that is, when the first connecting piece is welded to the side of the first rivet block 212 facing away from the first plate 110, the second reinforcement 140 may interfere with the welding operation, and the first plastic part 211 may be easily thermoplastically deformed due to the welding heat. If H3 - H1 > 0.39 mm, H1 is too small, that is, the side of the second reinforcement 140 that protrudes beyond the first plate 110 in the first direction D1 is too small. This reduces the structural strength of the second reinforcement 140, and thus the structural strength of the plate assembly 100, increasing the risk of deformation of the plate assembly 100.

[0066] Optionally, the battery top cover further includes a third plastic part 231 and two fourth plastic parts 232, the third plastic part 231 is located on the side of the first plate 110 away from the first direction D1, the first column 214 is passed through the third plastic part 231, and the third plastic part 231 is sandwiched between the first plate 110 and the first base 213 to achieve insulation between the first plate 110 and the first base 213; the two fourth plastic parts 232 correspond to the two second plates 120 one by one, the fourth plastic part 232 is located on the side of the second plate 120 away from the first direction D1, and the second column 224 is passed through The fourth plastic part 232 is sandwiched between the second plate 120 and the second base 223 to achieve insulation between the second plate 120 and the second base 223. This split structural design of the third plastic part 231 and the fourth plastic part 232 is beneficial to reducing the difficulty of assembling the plate assembly 100, the first pole assembly 210, the second pole assembly 220, the third plastic part 231 and the fourth plastic part 232, and can also improve the symmetry of the two second pole assemblies 220 after the battery top cover is assembled, which is beneficial to improving the product yield of the battery top cover and the battery cell.

[0067] Optionally, the plate assembly 100 also includes a third reinforcement 150, which is connected between the side of the first plate 110 that faces away from the first direction D1 and the side of the second plate 120 that faces away from the first direction D1, so that the third reinforcement 150 supports the first plate 110 and the second plate 120, especially supports the connection position between the first plate 110 and the second plate 120, thereby improving the structural strength of the connection position between the first plate 110 and the second plate 120, and further reducing the risk of deformation problems in the plate assembly 100.

[0068] Furthermore, the third reinforcement member 150 is sheet-shaped, with two adjacent sides of the third reinforcement member 150 connected to the first plate 110 and the second plate 120, respectively, to increase the structural strength of the third reinforcement member 150, thereby improving the support effect of the third reinforcement member 150 on the first plate 110 and the second plate 120. Of course, in other embodiments, the third reinforcement member 150 may also be a rod-shaped structure, with both ends of the rod-shaped third reinforcement member 150 connected to the first plate 110 and the second plate 120, respectively, to provide a supporting effect.

[0069] Alternatively, as Figure 4 、 Figure 8 and Figure 10 As shown, the panel assembly 100 further includes two supporting eaves 160, which correspond one-to-one to the two second panels 120. The supporting eaves 160 are connected to the side of the second panels 120 facing away from the reinforcement portion 111, and are parallel to the first panel 110. The shape of the opening of the battery cell housing 1 matches the shape of the panel assembly 100. That is, the battery cell housing 1 at the opening has a first planar section 11 parallel to the first panel 110, a sloped section 12 parallel to the second panel 120, and a second planar section 13 parallel to the supporting eaves 160. When the panel assembly 100 is placed over the opening, the first panel 110 is snapped onto the first planar section 11, the two second panels 120 are snapped onto corresponding sloped sections 12, and the two supporting eaves 160 are snapped onto corresponding second planar sections 13. This structural design is based on the snap-fit ​​connection between the plate assembly 100 and the battery cell shell 1 at the opening. Due to the snap-fit ​​connection between the support eaves 160 and the second planar section 13, the stability and reliability of the connection between the plate assembly 100 and the battery cell shell 1 are greatly improved. In addition, compared with the structure without the second planar section 13, this design of providing the second planar section 13 on the battery cell shell 1 at the opening can reduce the production difficulty of the battery cell shell 1, thereby improving production efficiency and reducing production costs.

[0070] Furthermore, in the direction in which the two second plates 120 are away from each other, the plate assembly 100 protrudes from the second pole assembly 220 so as to Figure 8 For example, Figure 8The two second plates 120 are arranged in a left-right direction. The plate assembly 100 protrudes from the left second pole assembly 220 in the left direction, and the plate assembly 100 protrudes from the right second pole assembly 220 in the right direction. This structure allows the plate assembly 100 to protect the second pole assembly 220 when the two second plates 120 are facing away from each other, reducing the chance of the second pole assembly 220 being bumped during the manufacturing process.

[0071] It should be noted that in this embodiment, a support eave 160 is connected to the side of the second plate 120 facing away from the reinforcing portion 111. Therefore, one of the two support eaves 160 protrudes from the second pole assembly 220 on the second plate 120 connected to the support eave 160 in a direction away from the other. In other embodiments, when the support eave 160 is omitted, one of the two second plates 120 protrudes from the second pole assembly 220 located on the second plate 120 in a direction away from the other.

[0072] Alternatively, as Figure 4 As shown, the side of the second plate 120 away from the first direction D1 and the side of the reinforcement portion 111 away from the first direction D1 are transitionally connected through the first rounded corner 170. Figure 10 and Figure 1 As shown, the sloped section 12 and the first planar section 11 are transitionally connected via a second fillet 14. The shape of the second fillet 14 matches the shape of the first fillet 170, so that the first plate 110 is snapped onto the first planar section 11, and the second plate 120 is snapped onto the sloped section 12. When the battery top cover and the cell casing 1 are assembled, that is, when the plate assembly 100 is snapped onto the opening of the cell casing 1, the structural design of the first fillet 170 and the second fillet 14 can significantly reduce the risk of damage at the connection between the second plate 120 and the reinforcement 111, and also significantly reduce the risk of damage at the connection between the first planar section 11 and the sloped section 12. This has the effect of improving the assembly yield of the battery top cover and the cell casing 1, which is conducive to improving the product yield of the battery cells.

[0073] Optionally, the structural strength of the first plate body 110, the second plate body 120 and the supporting eaves 160 are all less than the structural strength of the first reinforcement 130. For example, a material with higher structural strength can be selected to prepare the first reinforcement 130, or the thickness of the first plate body 110, the second plate body 120 and the supporting eaves 160 can be appropriately thinned to make the structural strength of the first reinforcement 130 higher. In particular, when the thickness of the first plate body 110, the second plate body 120 and the supporting eaves 160 is thinned, the overall weight and volume of the plate assembly 100 can be effectively reduced, thereby achieving the effect of increasing the energy density of the battery cell and reducing the production cost.

[0074] Furthermore, the first plate body 110, the second plate body 120, the supporting eaves 160, the second reinforcement 140 and the third reinforcement 150 are an integrated structure, and the first reinforcement 130 and the first plate body 110 are non-integrated structures. In actual production, the first reinforcement 130 and the remaining part of the plate assembly 100 except the first reinforcement 130 can be prepared by stamping and stretching processes respectively, and then the first reinforcement 130 and the reinforcement part 111 are connected by welding. Compared with making the plate assembly 100 an integrated structure as a whole, the technical solution provided in this embodiment is conducive to achieving the structural strength of the first reinforcement 130 being higher than the structural strength of the first plate body 110 and other components, thereby achieving the effect of reducing process difficulty, improving production efficiency and reducing production costs.

[0075] Alternatively, as Figure 5 As shown, the distance A between the two sides of the two reinforcement portions 111 facing each other is 25 mm ≤ A ≤ 76 mm. For example, A can be 25 mm, 50 mm, or 76 mm. If A is less than 25 mm, the installation space of the first pole assembly 210 will be reduced, especially the riveting space between the first rivet block 212 and the first column 214 will be significantly reduced, which not only increases the riveting difficulty but also reduces the riveting accuracy. If A is greater than 76 mm, the structural strength of the first plate body 110 will be reduced, thereby increasing the risk of deformation of the plate body assembly 100.

[0076] Optionally, the angle between the two sides of the second plate bodies 120 facing away from the first direction D1 is N, 70°≤N≤115°. For example, N can be 70°, 80° or 115°, etc. If N is less than 70°, the side of the plate assembly 100 facing the first direction D1 is relatively narrow, which will reduce the structural strength of the plate assembly 100 and increase the risk of deformation of the plate assembly 100. If N is greater than 115°, the size of the first reinforcement 130 protruding from the second pole assembly 220 along the first direction D1 is smaller, which will reduce the protective effect of the first reinforcement 130 on the second pole assembly 220 and increase the risk of the second pole assembly 220 being bumped during the manufacturing process.

[0077] Alternatively, as Figure 6 As shown, the thickness of the second reinforcement member 140 is L, 0.8mm≤L≤2mm. For example, L can be 0.8mm, 1.5mm, or 2mm. If L is less than 0.8mm, the structural strength of the second reinforcement member 140 will be reduced, thereby reducing the support effect of the second reinforcement member 140 on the two reinforcement parts 111 and the first plate body 110, and increasing the risk of deformation of the plate assembly 100. If L is greater than 2mm, the overall weight and volume of the plate assembly 100 will increase, which will increase production costs and reduce the energy density of the battery cell.

[0078] Alternatively, as Figure 8 As shown, the distance between the side of the first reinforcement 130 facing the first direction D1 and the side of the first plate 110 facing the first direction D1 is H2, where 10 mm ≤ H2 ≤ 40 mm. For example, H2 can be 10 mm, 25 mm, or 40 mm. If H2 is less than 10 mm, the protective capability of the first reinforcement 130 for the first and second pole assemblies 210, 220 will be reduced, increasing the risk of the first and second pole assemblies 210, 220 being bumped during the manufacturing process. At the same time, the volume of the protrusion 21 will be reduced, which is not conducive to increasing the capacity of the electrode group 2. If H2 is greater than 40 mm, the overall volume and weight of the plate assembly 100 will increase, thereby increasing production costs and reducing the energy density of the battery cell.

[0079] Table 1 below provides six sets of examples and six sets of comparative examples. In all six sets of examples and comparative examples, the thickness of the cell casing 1 is 0.35 mm. The insulating film covering the outer surface of the electrode group 2 is polypropylene (PP) film. The first and second plastic parts 211 and 221 are both made of polyphenylene sulfide (PPS). The third and fourth plastic parts 231 and 232 are both made of PP. The thickness of the first plate 110, the second plate 120, and the supporting eaves 160 is T1.

[0080]

[0081] In Example 1, T1 is 2mm, T2 is 1mm, A is 25mm, N is 70°, H3-H1 is 0.1mm, H2 is 10mm, L is 0.8mm, W1 is 0.25mm, and W2-W1 is 1mm. The battery cell yield rate is >98% with no mismatch between the plate assembly 100 and the cell housing 1, and no deformation of the plate assembly 100. The plate assembly 100, first reinforcement 130, electrode group 2, first tab, and second tab are all free of damage or deformation. The battery cover's current capacity meets the cell requirements.

[0082] In Example 2, T1 is 2 mm, T2 is 1.1 mm, A is 40 mm, N is 78°, H3-H1 is 0.15 mm, H2 is 15 mm, L is 1 mm, W1 is 0.25 mm, and W2-W1 is 1.1 mm. The cell yield rate is >98%. There are no issues with the plate assembly 100 mismatching with the cell housing 1, and no deformation of the plate assembly 100. The plate assembly 100, first reinforcement 130, electrode group 2, first tab, and second tab are all intact and free of deformation. The battery cover's current capacity meets the cell requirements.

[0083] In Example 3, T1 was 2 mm, T2 was 1.2 mm, A was 48 mm, N was 84°, H3-H1 was 0.2 mm, H2 was 20 mm, L was 1.2 mm, W1 was 0.3 mm, and W2-W1 was 1.2 mm. The cell yield rate was >98%. There were no issues with the plate assembly 100 mismatching with the cell housing 1, nor any deformation of the plate assembly 100. The plate assembly 100, first reinforcement 130, electrode group 2, first tab, and second tab were all intact and showed no damage or deformation. The battery cover's current capacity met the cell requirements.

[0084] In Example 4, T1 is 2mm, T2 is 1.3mm, A is 54mm, N is 90°, H3-H1 is 0.25mm, H2 is 30mm, L is 1.5mm, W1 is 0.3mm, and W2-W1 is 1.3mm. The cell yield rate is >98% and there are no issues with the plate assembly 100 mismatching with the cell housing 1 or deformation of the plate assembly 100. The plate assembly 100, first reinforcement 130, electrode group 2, first tab, and second tab are all intact and free of deformation. The battery cover's current capacity meets the cell requirements.

[0085] In Example 5, T1 is 2 mm, T2 is 1.4 mm, A is 65 mm, N is 100°, H3-H1 is 0.3 mm, H2 is 35 mm, L is 1.7 mm, W1 is 0.4 mm, and W2-W1 is 1.4 mm. The cell yield rate is >98%. There are no issues with the plate assembly 100 mismatching with the cell housing 1, and no deformation of the plate assembly 100. The plate assembly 100, first reinforcement 130, electrode group 2, first tab, and second tab are all intact and free of deformation. The battery cover's current capacity meets the cell requirements.

[0086] In Example 6, T1 was 2 mm, T2 was 1.5 mm, A was 76 mm, N was 115°, H3-H1 was 0.35 mm, H2 was 40 mm, L was 2 mm, W1 was 0.5 mm, and W2-W1 was 1.5 mm. The cell yield rate was >98%. There were no issues with the plate assembly 100 mismatching with the cell housing 1, nor any deformation of the plate assembly 100. The plate assembly 100, first reinforcement 130, electrode group 2, first tab, and second tab were all intact and showed no damage or deformation. The battery cover's current capacity met the cell requirements.

[0087] In comparative example 1, T1 is 2mm, T2 is 0.9mm, A is 48mm, N is 84°, H3-H1 is 0.15mm, H2 is 20mm, L is 1mm, W1 is 0.3mm, W2-W1 is 1.1mm, and the qualified yield rate of the battery cell is <98%: the structural strength of the first reinforcement 130 is low, the structural strength of the plate assembly 100 is low, the first reinforcement 130 has poor protection ability for the pole assembly, and the pole assembly is easily bumped.

[0088] In Comparative Example 2, T1 is 2 mm, T2 is 1.6 mm, A is 48 mm, N is 84°, H3-H1 is 0.15 mm, H2 is 20 mm, L is 1 mm, W1 is 0.3 mm, W2-W1 is 1.1 mm, and the qualified yield rate of the battery cell is <98%: the overall weight and volume of the plate assembly 100 are large, the production cost is high, the energy density of the battery cell is low, the internal space of the groove 133 is small, the volume of the protrusion 21 is small, and the capacity of the electrode group 2 is small.

[0089] In Comparative Example 3, T1 is 2 mm, T2 is 1.2 mm, A is 48 mm, N is 84°, H3-H1 is 0.06 mm, H2 is 20 mm, L is 1 mm, W1 is 0.3 mm, W2-W1 is 1.1 mm, and the qualified yield rate of the battery cell is <98%: when welding the first connecting piece and the first rivet block 212, the second reinforcement 140 is likely to interfere with the welding operation, and the first plastic part 211 is prone to thermoplastic deformation.

[0090] In Comparative Example 4, T1 is 2mm, T2 is 1.2mm, A is 48mm, N is 84°, H3-H1 is 0.4mm, H2 is 20mm, L is 1mm, W1 is 0.3mm, W2-W1 is 1.1mm, and the qualified yield rate of the battery cell is <98%: the second reinforcement 140 has low structural strength and the plate assembly 100 has low structural strength, and the plate assembly 100 is easily deformed under stress.

[0091] In comparative example 5, T1 is 2mm, T2 is 1.2mm, A is 48mm, N is 84°, H3-H1 is 0.15mm, H2 is 20mm, L is 1mm, W1 is 0.25mm, W2-W1 is 0.9mm, and the qualified yield rate of the battery cell is <98%: the structural strength of the reinforcement 111 is low, the structural strength of the plate assembly 100 is low, the plate assembly 100 is easily deformed under force, the first reinforcement 130 has poor protection ability for the pole assembly, and the pole assembly is easily bumped during the manufacturing process.

[0092] In Comparative Example 6, T1 is 2 mm, T2 is 1.2 mm, A is 48 mm, N is 84°, H3-H1 is 0.15 mm, H2 is 20 mm, L is 1 mm, W1 is 0.5 mm, and W2-W1 is 1.6 mm. The cell yield rate is less than 98%. The plate assembly 100 is heavy and bulky, resulting in high production costs and low cell energy density. The reliability of the connection between the first reinforcement 130 and the boss 1112 is low, resulting in low structural strength of the plate assembly 100. The protrusion 21 is small, resulting in a low capacity of the electrode group 2.

[0093] In summary, when the above parameters meet the conditions of 0.07mm≤H3-H1≤0.39mm, 0.95mm≤T2≤1.55mm, 0.25≤W1≤0.5mm, 0.8≤L≤2mm, 0.95mm≤W2-W1≤1.55mm, and 70°≤N≤115°, the deformation risk of the plate assembly 100 can be reduced, the risk of the first pole assembly 210 and the second pole assembly 220 being bumped during the manufacturing process can be reduced, and the overcurrent capacity of the battery top cover can be improved, so that the qualified yield rate of the battery cell is greater than 98%.

[0094] In this embodiment, the plate assembly 100 is made of aluminum material, and the parts of the plate assembly 100 other than the first reinforcement 130 (for example, the first plate 110, the second plate 120, the supporting eaves 160, the second reinforcement 140 and the third reinforcement 150) are made by stamping and stretching processes. The first reinforcement 130 is made by stamping and stretching processes, and then the first reinforcement 130 is fixed to the reinforcement part 111 of the first plate 110 by laser welding. The first plastic part 211 and the third plastic part 231 are formed on the first plate 110 by injection molding, and the second plastic part 221 and the fourth plastic part 232 are formed on the second plate 120. The first column 214 and the first rivet block 212 are riveted by riveting process, and the second column 224 and the second rivet block 222 are riveted by riveting process. The above-mentioned stamping process, stretching process, injection molding process, riveting process and laser welding process are all relatively common production processes in this field, which are conducive to realizing mass automated production.

[0095] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. Battery cover, characterized in that, include: A plate assembly (100) is provided, wherein the plate assembly (100) is used to cover the opening of the battery shell (1), and the direction from the battery shell (1) to the plate assembly (100) is configured as a first direction (D1). The plate assembly (100) includes a first plate (110), a second plate (120) and a first reinforcement (130). The first plate (110) is perpendicular to the first direction (D1), and the edge of the first plate (110) on one side of the first direction (D1) is perpendicular to the first direction (D1). A reinforcing portion (111) is provided on the edge of the second plate (120), one side of the second plate (120) is connected to the reinforcing portion (111), the second plate (120) is inclined from the side facing the reinforcing portion (111) to the side facing away from the reinforcing portion (111) in a direction away from the first direction (D1), the first reinforcing member (130) is connected to the reinforcing portion (111), and at least one of the first reinforcing member (130) and the reinforcing portion (111) protrudes along the first direction (D1); A pole assembly is provided, wherein at least one of the first plate (110) and the second plate (120) is provided with the pole assembly, and the first reinforcement (130) protrudes from the pole assembly along the first direction (D1).

2. The battery top cover according to claim 1, characterized in that: The reinforcement portion (111) is provided with a through hole (1111).

3. The battery top cover according to claim 2, characterized in that: A boss (1112) is provided on the hole wall of the through hole (1111), and the first reinforcement member (130) is embedded in the through hole (1111) and connected to the side of the boss (1112) facing the first direction (D1).

4. The battery top cover according to claim 3, characterized in that: The dimension of the boss (1112) protruding from the hole wall of the through hole (1111) is W1, the sum of the wall thickness of the reinforcement portion (111) and the dimension of the boss (1112) protruding from the hole wall of the through hole (1111) is W2, and 0.95mm≤W2-W1≤1.55mm.

5. The battery top cover according to any one of claims 1 to 4, characterized in that: The first reinforcement member (130) protrudes along the first direction (D1), and a first protective surface (131) and a second protective surface (132) connected to each other are provided on the side of the first reinforcement member (130) facing the first direction (D1), the first protective surface (131) is parallel to the first plate body (110), the second protective surface (132) is parallel to the second plate body (120), and the second protective surface (132) is located on the side of the reinforcement portion (111) facing the second plate body (120).

6. The battery top cover according to claim 5, characterized in that: A groove (133) is provided on a side of the first reinforcement member (130) facing away from the first direction (D1).

7. The battery top cover according to claim 6, characterized in that: The wall thickness of the first reinforcement (130) is T2, 0.95 mm ≤ T2 ≤ 1.55 mm.

8. The battery top cover according to any one of claims 1 to 4, characterized in that: The number of the reinforcing portion (111), the first reinforcing member (130) and the second plate body (120) are all two and correspond one to one, and the two reinforcing portions (111) are symmetrically arranged about the center of the first plate body (110).

9. The battery top cover according to claim 8, characterized in that: The plate assembly (100) further comprises a second reinforcing member (140), the reinforcing portion (111) protrudes along the first direction (D1), and opposite sides of the second reinforcing member (140) are respectively connected to the sides of the two reinforcing portions (111) facing each other.

10. The battery top cover according to claim 9, characterized in that: The second reinforcement member (140) is connected to the side of the first plate (110) facing the first direction (D1), and the distance between the side of the second reinforcement member (140) facing the first direction (D1) and the side of the first plate (110) facing the first direction (D1) is H1. The pole assembly includes a first pole assembly (210), and the first pole assembly (210) is passed through the first plate (110). The distance between the side of the first pole assembly (210) facing the first direction (D1) and the side of the first plate (110) facing the first direction (D1) is H3, and 0.07mm≤H3-H1≤0.39mm.

Images