Battery cover plate and battery monomer

Abstract

The invention belongs to the technical field of batteries, and discloses a battery cover plate and a single battery, the battery cover plate comprises a plate body assembly and a pole assembly, the plate body assembly is used for covering an opening of a battery shell, the plate body assembly comprises a first plate body, a second plate body and a connecting part, the first plate body comprises a first surface and a second surface which are oppositely arranged, the first surface is configured to be arranged towards the battery shell, the direction from the first surface to the second surface is a first direction, the second plate body comprises a first side and a second side which are oppositely arranged, the second plate body inclines in the direction deviating from the first direction from the direction from the first side to the second side, and the first side is connected with the first plate body through a connecting part; the battery cover plate comprises a first plate body and a second plate body, a connecting part is arranged between the first plate body and the second plate body, the connecting part protrudes towards the first direction, a pole assembly penetrates through at least one of the first plate body and the second plate body, the connecting part protrudes out of the pole assembly along the first direction, the structural strength of the plate body assembly can be improved, and the probability that the pole assembly is bumped in the manufacturing process can be reduced.

Description

Technical Field

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

[0002] The battery cover is an important component of the battery cell. The battery cover is placed on the battery shell to form a closed space inside the battery shell.

[0003] Existing plates are flat and thin, resulting in low structural strength. During assembly and transportation, the plates are susceptible to deformation, reducing the assembly yield between the plates and the battery case. Furthermore, the flat plate structure causes the poles protruding from the plate surface. During assembly and transportation, the poles protruding from the side of the plate facing away from the battery case are easily bumped, further reducing the safety performance and appearance yield of the battery cells.

[0004] Therefore, it is urgent to propose a battery cover and a battery cell to solve the above technical problems. Summary of the Invention

[0005] A first object of the present invention is to provide a battery cover plate, which can improve the structural strength of the plate assembly and reduce the probability of the pole assembly being bumped during the manufacturing process.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] Battery cover, including:

[0008] A plate assembly, the plate assembly is used to cover the opening of the battery shell, the plate assembly includes a first plate, a second plate and a connecting portion, the first plate includes a first surface and a second surface arranged opposite to each other, the first surface is configured to be arranged toward the battery shell, and the direction from the first surface to the second surface is a first direction, the second plate includes a first side and a second side arranged opposite to each other, the direction from the first side to the second side, the second plate is inclined in a direction away from the first direction, the first side is connected to the first plate through the connecting portion, and the connecting portion protrudes in the first direction;

[0009] The pole assembly is provided through at least one of the first plate and the second plate, and the connecting portion protrudes from the pole assembly along a first direction.

[0010] Optionally, the number of the second plates and the connecting parts are both two and they correspond one to one. In the length direction of the battery cover, the two second plates are symmetrically arranged about the middle of the first plate, and the two connecting parts are symmetrically arranged about the middle of the first plate.

[0011] Optionally, the pole assembly includes a first pole assembly and two second pole assemblies, the first pole assembly is arranged through the first plate body, and the two second pole assemblies are respectively arranged through corresponding second plates, and the polarity of the first pole assembly and the two second pole assemblies are the same.

[0012] Optionally, along the direction from the first side to the second side, a distance between a side of the second pole assembly facing away from the second plate body and toward the first side and the connecting portion is W2, and 12.5 mm ≤ W2 ≤ 31 mm.

[0013] Optionally, a portion of the first electrode assembly facing away from the battery shell has a dimension L1 in the length direction of the battery cover, a distance between the two connecting portions in the length direction of the battery cover is L2, and 0.49≤L1 / L2≤0.89.

[0014] Optionally, the dimension of the portion of the first pole assembly away from the battery shell in the length direction of the battery cover is L1, and the dimension of the portion of the second pole assembly away from the battery shell is L3 along the direction pointing from the first side to the second side, -1mm≤L3-L1≤41mm.

[0015] Optionally, in the length direction of the battery cover, the plate assembly protrudes from the second pole assembly.

[0016] A second object of the present invention is to provide a battery cell having a plate assembly with high structural strength and a low probability of the terminal assembly being bumped during the manufacturing process.

[0017] To achieve this object, the present invention adopts the following technical solutions:

[0018] The battery cell comprises a battery shell, an electrode group and the above-mentioned battery cover. The battery shell is provided with a communicating accommodation cavity and an opening. The electrode group is arranged in the accommodation cavity, and the plate assembly cover is arranged at the opening.

[0019] Optionally, the battery shell includes two oppositely arranged first walls, a third protrusion is provided on the side of the first wall facing the first direction, the surface of the third protrusion facing the first direction includes a first plane section and a slope section, the first plane section is connected to the slope section, the first plate body and the connecting part are both covered on the first plane sections of the two first walls, and the second plate body is covered on the slope sections of the two first walls.

[0020] Optionally, the first plate, the connecting portion, the second plate, and the third protrusions of the two first walls enclose a first capacity expansion space within the battery shell; the connecting portion is provided with a second capacity expansion space on a side facing the battery shell; the second capacity expansion space, the first capacity expansion space, the opening, and the accommodating cavity are sequentially connected; a first protrusion is provided on a side of the electrode group facing the first direction, at least a portion of the first protrusion is located within the first capacity expansion space; a second protrusion is provided on a side of the first protrusion facing the first direction, and the second protrusion is located within the second capacity expansion space;

[0021] And / or, the plate assembly also includes a supporting eaves, the supporting eaves is connected to the second side, the supporting eaves is parallel to the first plate, the surface of the third protrusion facing the first direction also includes a second plane section, the second plane section is connected to the side of the slope section away from the first plane section, the battery shell also includes a second wall body, in the distribution direction of the two first walls, the two sides of the second wall body are respectively connected to the two first walls, the surface of the second wall body facing the first direction is the third plane section, the third plane section is connected to the side of the second plane section away from the slope section, and the supporting eaves cover is arranged on the third plane section and the second plane sections of the two first walls.

[0022] Beneficial effects of the present invention:

[0023] The plate assembly includes a first plate, a second plate and a connecting portion. The first side of the second plate is connected to the first plate through the connecting portion. The connecting portion protrudes in the first direction and points from the first side to the second side. The second plate is inclined in the direction away from the first direction. This structural design makes the plate assembly roughly present a "concave-convex" structure, which is beneficial to improving the structural strength of the plate assembly, and thereby reducing the probability of the plate assembly being deformed by force during assembly and transportation processes, and has the effect of improving the assembly yield of the plate assembly and the battery shell.

[0024] In addition, at least one of the first plate and the second plate is provided with a pole assembly, and the connecting portion protrudes from the pole assembly along the first direction, thereby enabling the connecting portion to protect the pole assembly, thereby reducing the chance of the pole assembly being bumped during assembly and transportation processes, and improving the safety and appearance yield of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is an enlarged view of the local structure of the battery cell provided by the present invention;

[0026] Figure 2 This is a schematic diagram of the first cross-sectional structure of the battery cover provided by the present invention;

[0027] Figure 3 This is a first structural schematic diagram of the battery cover provided by the present invention;

[0028] Figure 42 is a schematic diagram of a second cross-sectional structure of a battery cover provided by the present invention;

[0029] Figure 5 This is an enlarged view of the partial cross-sectional structure of the battery cell provided by the present invention;

[0030] Figure 6 This is an enlarged view of the local structure of the battery case provided by the present invention;

[0031] Figure 7 This is a second structural schematic diagram of the battery cover provided by the present invention.

[0032] In the picture:

[0033] D1, first direction; D2, second direction;

[0034] 1. Battery case; 11. Opening; 12. First wall; 12a. First planar section; 12b. Slope section; 12c. Second planar section; 12d. Third protrusion; 13. Second wall; 13a. Third planar section; 2. Electrode group; 21. First protrusion; 22. Second protrusion; 23. First tab; 24. Second tab;

[0035] 100. Plate assembly; 110. First plate; 111. First surface; 112. Second surface; 120. Second plate; 121. First side; 122. Second side; 130. Connecting portion; 131. Second capacity expansion space; 132. First sub-connecting portion; 133. Second sub-connecting portion; 140. Supporting eaves; 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; 310. First capacity expansion space; 410. Third plastic part; 420. Fourth plastic part. DETAILED DESCRIPTION

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] This embodiment provides a battery cover plate, which can improve the structural strength of the plate assembly and reduce the probability of the pole assembly being bumped during the manufacturing process.

[0041] Specifically, if Figures 1 to 3As shown, the battery cover includes a plate assembly 100 and a pole assembly, wherein the plate assembly 100 is used to cover the opening 11 of the battery shell 1, the plate assembly 100 includes a first plate 110, a second plate 120 and a connecting portion 130, the first plate 110 includes a first surface 111 and a second surface 112 arranged opposite to each other, the first surface 111 is configured to be arranged toward the battery shell 1, and the direction of the first surface 111 pointing to the second surface 112 is a first direction D1, and the second plate 1 20 includes a first side 121 and a second side 122 arranged opposite to each other, with the first side 121 pointing to the second side 122, and the second plate body 120 is inclined in a direction away from the first direction D1 (i.e., the second direction D2). The first side 121 is connected to the first plate body 110 through a connecting portion 130, and the connecting portion 130 protrudes in the first direction D1. At least one of the first plate body 110 and the second plate body 120 is provided with a pole assembly, and the connecting portion 130 protrudes from the pole assembly along the first direction D1.

[0042] Based on the above design, the plate assembly 100 includes a first plate 110, a second plate 120 and a connecting portion 130. The first side 121 of the second plate 120 is connected to the first plate 110 through the connecting portion 130. The connecting portion 130 protrudes in the first direction D1, pointing from the first side 121 to the direction of the second side 122. The second plate 120 is inclined in a direction away from the first direction D1. This structural design makes the plate assembly 100 roughly present a "concave-convex" structure, which is beneficial to improving the structural strength of the plate assembly 100, thereby reducing the probability of the plate assembly 100 being deformed by force during assembly and transportation, and has the effect of improving the assembly yield of the plate assembly 100 and the battery shell 1.

[0043] In addition, at least one of the first plate 110 and the second plate 120 is provided with a pole assembly, and the connecting portion 130 protrudes from the pole assembly along the first direction D1, so that the connecting portion 130 protects the pole assembly, which is beneficial to reduce the probability of the pole assembly being bumped during processes such as assembly and transportation, and has the effect of improving the safety and appearance yield of the battery cell.

[0044] It should be pointed out that at least one of the first plate body 110 and the second plate body 120 is provided with a pole assembly, which means: the first plate body 110 is provided with a pole assembly, or the second plate body 120 is provided with a pole assembly, or the first plate body 110 and the second plate body 120 are respectively provided with a pole assembly, as long as the connecting portion 130 protrudes from the pole assembly along the first direction D1.

[0045] Optionally, the number of second plates 120 and connecting parts 130 are both two and they correspond one to one. In the length direction of the battery cover, the two second plates 120 are symmetrically arranged about the middle of the first plate 110, and the two connecting parts 130 are symmetrically arranged about the middle of the first plate 110, so that the plate assembly 100 has a symmetrical structure. This symmetrical structure is conducive to reducing the production difficulty of the plate assembly 100, thereby achieving the effect of improving production efficiency and reducing production costs.

[0046] Furthermore, the pole assembly includes a first pole assembly 210 and two second pole assemblies 220. The first pole assembly 210 is arranged on the first plate body 110, and the two second pole assemblies 220 are respectively arranged on a corresponding second plate body 120. The polarity of the first pole assembly 210 and the two second pole assemblies 220 is the same, thereby realizing that the battery cover has three pole assemblies with the same polarity. This structure can greatly improve the current flow capacity of the battery cover, so that the battery cover can meet the needs of high-capacity and high-rate battery cells.

[0047] It should be noted that the connection portion 130 protruding from the pole assembly along the first direction D1 means that the connection portion 130 protrudes from the first pole assembly 210 in the first direction D1 and the connection portion 130 protrudes from the second pole assembly 220 in the first direction D1.

[0048] Optionally, in the length direction of the battery cover, the plate assembly 100 protrudes from the second pole assembly 220 to Figure 2 For example, Figure 2 The left-right direction in the figure is the length of the battery cover. 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.

[0049] In this embodiment, the plate assembly 100 further includes two support eaves 140, which correspond one-to-one to the two second plates 120. Each support eave 140 is connected to the second side 122 of a corresponding second plate 120, and the support eaves 140 are parallel to the first plate 110. Therefore, in this embodiment, in the length direction of the battery cover, the plate assembly 100 protruding from the second pole assembly 220 means that one of the two support eaves 140 protrudes from the second pole assembly 220 on the second plate 120 connected to the support eave 140 in a direction away from the other. Of course, in other embodiments, the support eaves 140 may be omitted. In this case, in the direction in which the two second plates 120 are facing away from each other, the plate assembly 100 protruding from the second pole assembly 220 means that one of the two second plates 120 protrudes from the second pole assembly 220 disposed on the second plate 120 in a direction away from the other.

[0050] Alternatively, as Figure 2 As shown, 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 a side of the first plate 110 facing the first direction D1. A first groove is provided on a side of the first plastic part 211 facing away from the first plate 110, and the first rivet block 212 is embedded in the first groove. The first pole includes a first base 213 and a first column 214. The first base 213 is located on a side of the first plate 110 facing away from the first direction D1. 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 connecting portion 130 protrudes from the first rivet block 212 in the first direction D1 to reduce the probability of the first rivet block 212 being bumped during the manufacturing process.

[0051] 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. A second groove is provided on the side of the second plastic part 221 facing away from the second plate 120, and the second rivet block 222 is embedded in the second groove. The second pole includes a second base 223 and a second column 224, and the second base 223 is located on the side of the second plate 120 facing away from the first direction D1. One end of the second column 224 is connected to the second base 223, and the other end is passed through the second plate 120, the second plastic part 221 and the second rivet block 222, and is riveted to the second rivet block 222. The connecting portion 130 protrudes from the second rivet block 222 in the first direction D1 to reduce the probability of the second rivet block 222 being bumped during the manufacturing process.

[0052] Furthermore, 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.

[0053] Optionally, the battery cover further includes a third plastic part 410 and two fourth plastic parts 420, the third plastic part 410 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 410, and the third plastic part 410 is sandwiched between the first surface 111 of 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 420 correspond one-to-one to the two second plates 120, and the fourth plastic part 420 is located on the second plate 120 away from the first direction D1 On one side, the second column 224 is passed through the fourth plastic part 420, and the fourth plastic part 420 is clamped 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 410 and the fourth plastic part 420 is conducive to reducing the difficulty of assembling the plate assembly 100, the third plastic part 410 and the fourth plastic part 420, and can also improve the symmetry of the two second pole assemblies 220 after the battery cover is assembled, which is conducive to improving the yield of the battery cover and the battery cell.

[0054] Alternatively, as Figure 4 As shown, the dimension of the portion of the first electrode assembly 210 facing away from the battery shell 1 in the length direction of the battery cover is L1, and the spacing between the two connecting portions 130 in the length direction of the battery cover is L2. 0.49≤L1 / L2≤0.89. For example, L1 / L2 can be 0.49, 0.5, 0.55, 0.6, 0.85, or 0.89, among which 0.5≤L1 / L2≤0.85 is preferred. If L1 / L2 is less than 0.49, the dimension of the first electrode assembly 210 in the direction in which the two connecting portions 130 point to each other is too small, which will reduce the flow capacity of the first electrode assembly 210 and thus reduce the flow capacity of the battery cover, making the battery cover unsuitable for high-capacity, high-rate battery cells. If L1 / L2>0.89, the size of the portion of the first pole assembly 210 that is away from the first plate 110 in the direction in which the two connecting portions 130 point to each other is too large. When the first rivet block 212 and the first column 214 are riveted, the riveting space is too small, which increases the difficulty of riveting the first rivet block 212 and the first column 214, and reduces the riveting accuracy of the first rivet block 212 and the first column 214, thereby reducing the yield rate of the battery cover.

[0055] Optionally, the dimension of the portion of the first pole assembly 210 facing away from the battery shell 1 in the length direction of the battery cover is L1, and the dimension of the portion of the second pole assembly 220 facing away from the battery shell 1 in the direction of the first side 121 pointing to the second side 122 is L3, -1mm≤L3-L1≤41mm. Exemplarily, L3-L1 can be -1mm, 0mm, 10mm, 25mm, 40mm or 41mm, etc., among which 0mm≤L3-L1≤40mm is preferred. If L3-L1<-1mm, L1 is too large and L3 is too small. When riveting the first rivet block 212 and the first column 214, the riveting space is too small, which increases the difficulty of riveting the first rivet block 212 and the first column 214, and reduces the riveting accuracy of the first rivet block 212 and the first column 214, thereby reducing the yield rate of the battery cover; and, if L3 is too small, the flow capacity of the second pole assembly 220 will be reduced, thereby reducing the flow capacity of the battery cover, making the battery cover unable to adapt to high-capacity, high-rate battery cells. If L3-L1>41mm, the size of the portion of the second pole assembly 220 that is away from the second plate body 120 along the direction from the first side 121 to the second side 122 is too large, and when the second rivet block 222 and the second column 224 are riveted, the riveting space is too small, which increases the difficulty of riveting the second rivet block 222 and the second column 224, and reduces the riveting accuracy of the second rivet block 222 and the second column 224, thereby reducing the yield rate of the battery cover.

[0056] like Figure 2 and Figure 4 As shown, in this embodiment, L1 refers to the dimension of the first plastic part 211 in the direction in which the two connecting portions 130 point to each other; L3 refers to the dimension of the second plastic part 221 in the direction from the first side 121 to the second side 122 .

[0057] In this embodiment, the plate assembly 100 is made of aluminum material and is made by stamping and stretching processes. The injection molding process can be used to form the first plastic part 211 and the third plastic part 410 on the first plate 110, and the second plastic part 221 and the fourth plastic part 420 can be formed on the second plate 120. The riveting process can be used to achieve the connection between the first column 214 and the first riveted block 212, and the connection between the second column 224 and the second riveted block 222. The above-mentioned stamping process, stretching process, injection molding process and riveting process are all relatively common production processes in this field, which are conducive to realizing mass automated production.

[0058] This embodiment also provides a battery cell, such as Figure 1 、 Figure 5 and Figure 6As shown, the battery cell includes a battery shell 1, an electrode group 2, and the aforementioned battery cover. The battery shell 1 is provided with a connected accommodating cavity and an opening 11. The electrode group 2 is disposed within the accommodating cavity, and the plate assembly 100 is disposed over the opening 11. The battery cell utilizes the aforementioned battery cover. The plate assembly 100 generally has a "concave-convex" structure, which gives the plate assembly 100 a high structural strength. This reduces the probability of the plate assembly 100 being deformed by force during assembly and transportation, thereby improving the assembly yield of the plate assembly 100 and the battery shell 1, and thereby improving the safety and appearance yield of the battery cell. Furthermore, the connecting portion 130 of the battery cover protects the electrode assembly, reducing the probability of the electrode assembly being bumped during assembly and transportation, thereby improving the safety and appearance yield of the battery cell.

[0059] In this embodiment, the polarity of the first pole assembly 210 and the second pole assembly 220 is the same, and a third pole assembly (not shown in the figure) is provided on the side of the battery cell away from the first direction D1. The polarity of the third pole assembly is opposite to that of the first pole assembly 210 to realize the charging and discharging function of the battery cell.

[0060] Optionally, the battery shell 1 includes two oppositely arranged first walls 12, and a third protrusion 12d is provided on the side of the first wall 12 facing the first direction D1, and the surface of the third protrusion 12d facing the first direction D1 includes a first plane section 12a and a slope section 12b, the first plane section 12a is connected to the slope section 12b, the first plate 110 and the connecting portion 130 are both covered on the first plane sections 12a of the two first walls 12, and the second plate 120 is covered on the slope sections 12b of the two first walls 12 to form a structure in which the plate assembly 100 covers the opening 11 of the battery shell 1.

[0061] Optionally, the plate assembly 100 further includes a support eave 140 connected to the second side 122 and parallel to the first plate 110. The surface of the third protrusion 12d facing the first direction D1 further includes a second planar segment 12c, which is connected to the side of the slope segment 12b facing away from the first planar segment 12a. The battery case 1 further includes a second wall 13. In the distribution direction of the two first walls 12, the second wall 13 has two sides connected to the two first walls 12 respectively. The surface of the second wall 13 facing the first direction D1 is a third planar segment 13a, which is connected to the side of the second planar segment 12c facing away from the slope segment 12b. The support eave 140 covers the third planar segment 13a and the second planar segments 12c of the two first walls 12. This structure can improve the stability of the plate assembly 100 when covering the opening 11, thereby improving the stability of the assembly of the plate assembly 100 with the battery case 1.

[0062] In this embodiment, the number of the second plate 120 and the supporting eaves 140 is two, and the length direction of the battery cover ( Figure 6 12a and 12c are located on either side of the first plate 110, and the two supporting eaves 140 are located on either side of the first plate 110. Therefore, each first wall 12 is provided with two slope sections 12b and two second plane sections 12c, and in the length direction of the battery cover, the two slope sections 12b are located on either side of the first plane section 12a, and the two second plane sections 12c are located on either side of the first plane section 12a. There are two second walls 13, and the two second walls 13 are distributed along the length direction of the battery cover. Therefore, in the length direction of the battery cover, the second plate 120, the supporting eaves 140, the slope section 12b, the second plane section 12c and the third plane section 13a located on the same side of the first plane section 12a are a group, and each second plate is covered on the slope section 12b of the same group, and each supporting eaves 140 is covered on the second plane section 12c and the third plane section 13a of the same group. This forms a symmetrical assembly structure of the battery shell 1 and the plate assembly 100. This structural design not only helps to reduce the production difficulty of the battery shell 1 and the plate assembly 100, but also reduces the assembly difficulty of the battery shell 1 and the plate assembly 100, thereby achieving the effect of improving production efficiency and reducing production costs.

[0063] Optionally, the first plate 110, the connecting portion 130, the second plate 120, and the third protrusions 12d of the two first walls 12 enclose a first capacity expansion space 310 within the battery case 1. The connecting portion 130 is provided with a second capacity expansion space 131 on the side facing the battery case 1. The second capacity expansion space 131, the first capacity expansion space 310, the opening 11, and the accommodating cavity are sequentially connected. A first protrusion 21 is provided on the side of the electrode group 2 facing the first direction D1, with at least a portion of the first protrusion 21 located within the first capacity expansion space 310. A second protrusion 22 is provided on the side of the first protrusion 21 facing the first direction D1, with the second protrusion 22 located within the second capacity expansion space 131. This can increase the volume of the electrode group 2, thereby increasing its capacity. Furthermore, disposing the first protrusion 21 within the first capacity expansion space 310 and the second protrusion 22 within the second capacity expansion space 131 improves the internal space utilization of the battery cell, thereby increasing the energy density of the battery cell.

[0064] In this embodiment, part of the first protrusion 21 is located in the accommodating cavity, and another part of the first protrusion 21 passes through the opening 11 and is located in the first capacity expansion space 310. Of course, in other embodiments, all of the first protrusion 21 may be located in the first capacity expansion space 310.

[0065] Furthermore, there are two second protrusions 22, and each connecting portion 130 is provided with a second capacity expansion space 131 on the side facing the battery shell 1. Each second protrusion 22 is located in a corresponding second capacity expansion space 131, so that the electrode group 2 has a roughly symmetrical structure, which facilitates the simplification of the process of installing the electrode group 2 into the battery shell 1 and the assembly process of the electrode group 2 and the battery cover.

[0066] In this embodiment, a first pole tab 23 and two second pole tabs 24 are protruded from one side of the pole facing the first direction D1, wherein the first pole tab 23 is located between the two second protrusions 22, and the two second pole tabs 24 are respectively located on the sides of the two second protrusions 22 facing away from each other. The first pole tab 23 is welded to the first pole assembly 210 so that the pole group 2 is conductively connected to the first pole assembly 210 through the first pole tab 23, and the two second pole tabs 24 are respectively welded to a corresponding second pole assembly 220 so that the pole group 2 is conductively connected to the two second pole assemblies 220 through the two second pole tabs 24.

[0067] Alternatively, as Figure 4 As shown, along the direction from the first side 121 to the second side 122, the distance between the portion of the second pole assembly 220 facing away from the second plate 120 and the side facing the first side 121 and the connecting portion 130 is W2, where 12.5 mm ≤ W2 ≤ 31 mm. For example, W2 can be 12.5 mm, 13 mm, 20 mm, 25 mm, 30 mm, or 31 mm, with 13 mm ≤ W2 ≤ 30 mm being preferred. If W2 is less than 12.5 mm, W2 is too small, which reduces the dimensions of the first and second capacity expansion spaces 310 and 131 in the first direction D1, and thus reduces the dimensions of the first and second protrusions 21 and 22 in the first direction D1. This not only reduces the capacity of the pole group 2, but also reduces the structural strength of the first and second protrusions 21 and 22, increasing the probability of deformation and damage to the first and second protrusions 21 and 22 during the manufacturing process. If W2>31 mm, W2 is too large, which will cause L3 to decrease accordingly, reducing the current capacity of the second pole assembly 220 and reducing the capacity and rate of the battery cell.

[0068] like Figure 2 and Figure 4 As shown, in this embodiment, W2 refers to the distance between the side of the second plastic part 221 facing the first side 121 and the connecting portion 130 along the direction from the first side 121 to the second side 122 .

[0069] Optionally, the thickness of the first plate 110 is H, 3.5 mm ≤ H ≤ 10 mm. For example, H can be 3.5 mm, 5 mm, or 10 mm. If H is less than 3.5 mm, the first plate 110 is too thin, which reduces the structural strength of the first plate 110 and increases the probability of deformation and damage to the first plate 110 during the manufacturing process. If H is greater than 10 mm, the first plate 110 is too thick, which increases the weight and volume of the plate assembly 100 and is not conducive to improving the energy density of the battery cell.

[0070] Optionally, the connecting portion 130 includes a first sub-connecting portion 132 and a second sub-connecting portion 133, one side of the first sub-connecting portion 132 is connected to the first plate body 110, and the other side is connected to the second sub-connecting portion 133, and the side of the second sub-connecting portion 133 facing away from the first sub-connecting portion 132 is connected to the first side 121, the second sub-connecting portion 133 is parallel to the first plate body 110, and along the first direction D1, the first sub-connecting portion 132 is inclined toward the direction of the first side 121 to form a structure in which the connecting portion 130 protrudes from the first pole assembly 210 and the second pole assembly 220 in the first direction D1.

[0071] Furthermore, in the direction in which the two second plates 120 point to each other, the size of the second sub-connection portion 133 is W1, 12mm≤W1≤50mm. For example, W1 can be 12mm, 25mm or 50mm. If W1 is less than 12mm, the structural strength of the second sub-connection portion 133 is too low, thereby reducing the protective effect of the connection portion 130 on the first pole assembly 210 and the second pole assembly 220; if W1 is greater than 50mm, the volume of the connection portion 130 is too large, which will increase the weight and volume of the plate assembly 100, which is not conducive to improving the energy density of the battery cell.

[0072] Optionally, on the side away from the first direction D1, the angle between the two second plates 120 is N, 70°≤N≤110°. For example, N can be 70°, 80° or 110°, etc. If N is less than 71°, the first protrusion 21 of the pole group 2 will approach a sharp angle, which not only reduces the capacity of the pole group 2, but also reduces the structural strength of the first protrusion 21, thereby increasing the risk of deformation and damage of the first protrusion 21. If N is greater than 110°, the protective effect of the connecting portion 130 on the second pole assembly 220 is reduced, thereby increasing the probability of the second pole assembly 220 being bumped during the manufacturing process.

[0073] Table 1 below provides six sets of examples and six sets of comparative examples. In all six sets of examples and comparative examples, the battery case 1 had a thickness of 0.35 mm. The insulating film covering the outer surface of the electrode assembly 2 was a polypropylene (PP) film. The first and second plastic parts 211 and 221 were made of polyphenylene sulfide (PPS). The third and fourth plastic parts 410 and 420 were made of PP. The second plate 120 had a thickness of T1, and the first sub-connecting portion 132 had a thickness of T2.

[0074]

[0075] In Example 1, T1 is 2 mm, T2 is 1 mm, H is 3.5 mm, W1 is 12 mm, W2 is 13 mm, L1 is 20 mm, L1 / L2 is 0.5, L3-L1 is 40 mm, and N is 70°. The battery cell yield rate is >98%. There are no assembly anomalies between the plate assembly 100 and the battery housing 1, nor are there any issues with the structural strength of the plate assembly 100. The battery cover, electrode assembly 2, first tab 23, and second tab 24 are all free of damage or deformation. The battery cover's current capacity meets the requirements of the battery cells.

[0076] In Example 2, T1 is 2 mm, T2 is 1.2 mm, H is 4 mm, W1 is 19 mm, W2 is 17 mm, L1 is 26 mm, L1 / L2 is 0.56, L3-L1 is 25 mm, and N is 78°. The battery cell yield rate is >98%. There are no assembly anomalies between the plate assembly 100 and the battery housing 1, nor are there any issues with the structural strength of the plate assembly 100. The battery cover, electrode assembly 2, first tab 23, and second tab 24 are all free of damage or deformation. The battery cover's current capacity meets the requirements of the battery cells.

[0077] In Example 3, T1 is 2 mm, T2 is 1.2 mm, H is 5 mm, W1 is 26 mm, W2 is 19 mm, L1 is 34 mm, L1 / L2 is 0.64, L3-L1 is 15 mm, and N is 84°. The battery cell yield rate is >98%. There are no assembly anomalies between the plate assembly 100 and the battery housing 1, nor are there any issues with the structural strength of the plate assembly 100. The battery cover, electrode assembly 2, first tab 23, and second tab 24 are all free of damage or deformation. The battery cover's current capacity meets the requirements of the battery cells.

[0078] In Example 4, T1 is 2 mm, T2 is 1.5 mm, H is 6 mm, W1 is 32 mm, W2 is 22 mm, L1 is 45 mm, L1 / L2 is 0.72, L3-L1 is 12 mm, and N is 90°. The battery cell yield rate is >98%. There are no assembly anomalies between the plate assembly 100 and the battery housing 1, nor are there any issues with the structural strength of the plate assembly 100. The battery cover, electrode assembly 2, first tab 23, and second tab 24 are all free of damage or deformation. The battery cover's current capacity meets the requirements of the battery cells.

[0079] In Example 5, T1 is 2 mm, T2 is 1.5 mm, H is 7 mm, W1 is 44 mm, W2 is 25 mm, L1 is 52 mm, L1 / L2 is 0.78, L3-L1 is 8 mm, and N is 98°. The battery cell yield rate is >98%. There are no assembly anomalies between the plate assembly 100 and the battery housing 1, nor are there any issues with the structural strength of the plate assembly 100. The battery cover, electrode assembly 2, first tab 23, and second tab 24 are all free of damage or deformation. The battery cover's current capacity meets the requirements of the battery cells.

[0080] In Example 6, T1 is 2 mm, T2 is 1.8 mm, H is 10 mm, W1 is 50 mm, W2 is 30 mm, L1 is 60 mm, L1 / L2 is 0.85, L3-L1 is 0 mm, and N is 110°. The battery cell yield rate is >98%. There are no assembly anomalies between the plate assembly 100 and the battery housing 1, nor are there any issues with the structural strength of the plate assembly 100. The battery cover, electrode assembly 2, first tab 23, and second tab 24 are all free of damage or deformation. The battery cover's current capacity meets the requirements of the battery cells.

[0081] In Comparative Example 1, T1 is 2 mm, T2 is 1.2 mm, H is 5 mm, W1 is 26 mm, W2 is 12 mm, L1 is 26 mm, L1 / L2 is 0.56, L3-L1 is 15 mm, N is 84°, and the qualified yield rate of the battery cell is <98%: the first capacity expansion space 310 and the second capacity expansion space 131 are small in size in the first direction D1, and the first protrusion 21 and the second protrusion 22 are small in size in the first direction D1, which reduces the capacity of the electrode group 2 and increases the probability of deformation and damage of the first protrusion 21 and the second protrusion 22 during the manufacturing process.

[0082] In Comparative Example 2, T1 is 2mm, T2 is 1.2mm, H is 5mm, W1 is 26mm, W2 is 31.5mm, L1 is 26mm, L1 / L2 is 0.56, L3-L1 is 15mm, N is 84°, and the battery cell yield rate is <98%: L3 is too small, which makes the overcurrent capacity of the second pole assembly 220 low, reducing the capacity and rate of the battery cell.

[0083] In Comparative Example 3, T1 is 2mm, T2 is 1.2mm, H is 5mm, W1 is 26mm, W2 is 19mm, L1 is 20mm, L1 / L2 is 0.48, L3-L1 is 15mm, N is 84°, and the qualified yield rate of the battery cell is <98%: L1 is too small, and the overcurrent capacity of the first pole assembly 210 is low, which in turn reduces the overcurrent capacity of the battery cover, making the battery cover unable to adapt to high-capacity, high-rate battery cells.

[0084] In Comparative Example 4, T1 is 2mm, T2 is 1.2mm, H is 5mm, W1 is 26mm, W2 is 19mm, L1 is 60mm, L1 / L2 is 0.9, L3-L1 is 15mm, N is 84°, and the qualified yield rate of the battery cell is <98%: L1 is too large, and the riveting space between the first rivet block 212 and the first column 214 is too small, which reduces the riveting accuracy between the first rivet block 212 and the first column 214, thereby reducing the yield rate of the battery cover.

[0085] In Comparative Example 5, T1 is 2mm, T2 is 1.2mm, H is 5mm, W1 is 26mm, W2 is 19mm, L1 is 26mm, L1 / L2 is 0.56, L3-L1 is 42mm, N is 84°, and the qualified yield rate of the battery cell is <98%: L3 is too large, and the riveting space between the second rivet block 222 and the second column 224 is too small, which reduces the riveting accuracy between the second rivet block 222 and the second column 224, thereby reducing the yield rate of the battery cover.

[0086] In Comparative Example 6, T1 is 2mm, T2 is 1.2mm, H is 5mm, W1 is 26mm, W2 is 19mm, L1 is 26mm, L1 / L2 is 0.56, L3-L1 is -2mm, N is 84°, and the qualified yield rate of the battery cell is <98%: L1 is too large, the riveting space between the first rivet block 212 and the first column 214 is too small, and the riveting accuracy between the first rivet block 212 and the first column 214 is low; and L3 is too small, the flow capacity of the second pole assembly 220 is low, and the flow capacity of the battery cover is low.

[0087] In summary, when the above parameters meet the conditions of 12mm≤W1≤50mm, 12.5mm≤W2≤31mm, 0.49≤L1 / L2≤0.89, 3.5mm≤H≤10mm, -1mm≤L3-L1≤41mm, and 70°≤N≤110°, the probability of the first pole assembly 210 and the second pole group 2 assembly being bumped can be reduced, the structural strength of the plate assembly 100 can be improved, the assembly yield of the plate assembly 100 and the battery shell 1 can be improved, and the current flow capacity of the battery cover can be improved, so that the qualified yield of the battery cell is greater than 98%.

[0088] This embodiment also provides a battery module, which includes a first connecting plate, a second connecting plate and at least two of the above-mentioned battery cells. For example, the number of battery cells can be two, three or more. The first connecting plate and the second connecting plate are both made of metal materials with conductive properties such as copper plates or aluminum plates. The first pole assemblies 210 of every two battery cells are welded and fixed to the same first connecting plate, and the second pole assemblies 220 of every two battery cells are welded and fixed to the same second connecting plate to achieve a conductive connection between the two battery cells (in series or in parallel).

[0089] Furthermore, the first connecting piece is welded to the side of the first rivet block 212 facing away from the first plate 110, and the connecting portion 130 protrudes from the first connecting piece along the first direction D1. The second connecting piece is welded to the side of the second rivet block 222 facing away from the second plate 120, and the connecting portion 130 protrudes from the second connecting piece along the first direction D1. This allows the connecting portion 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. In addition, compared to a flat cover plate, when the length, width, and thickness of the battery cells are the same, this structure can save assembly space for the battery module, which is beneficial for improving the battery module assembly rate, thereby improving the energy density and performance of the battery module and reducing the cost of the battery module.

[0090] 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 used to cover an opening (11) of a battery shell (1), the plate assembly (100) comprising a first plate (110), a second plate (120) and a connecting portion (130), the first plate (110) comprising a first surface (111) and a second surface (112) arranged opposite to each other, the first surface (111) being arranged to face the battery shell (1), the first surface (111) pointing to the second surface ( 112) is a first direction (D1), the second plate body (120) comprises a first side (121) and a second side (122) arranged opposite to each other, the first side (121) points to the second side (122), the second plate body (120) is inclined in a direction away from the first direction (D1), the first side (121) is connected to the first plate body (110) through the connecting portion (130), and the connecting portion (130) protrudes in 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 connecting portion (130) protrudes from the pole assembly along the first direction (D1).

2. The battery cover according to claim 1, characterized in that: The number of the second plate bodies (120) and the connecting parts (130) are both two and they correspond one to one. In the length direction of the battery cover, the two second plate bodies (120) are symmetrically arranged about the middle part of the first plate body (110), and the two connecting parts (130) are symmetrically arranged about the middle part of the first plate body (110).

3. The battery cover according to claim 2, characterized in that: The pole assembly comprises a first pole assembly (210) and two second pole assemblies (220); the first pole assembly (210) is arranged through the first plate body (110); the two second pole assemblies (220) are respectively arranged through a corresponding second plate body (120); and the first pole assembly (210) and the two second pole assemblies (220) have the same polarity.

4. The battery cover according to claim 3, characterized in that: Along the direction from the first side (121) to the second side (122), a distance between a side of the second pole assembly (220) facing away from the second plate body (120) and toward the first side (121) and the connecting portion (130) is W2, 12.5 mm ≤ W2 ≤ 31 mm.

5. The battery cover according to claim 3, characterized in that: The portion of the first pole assembly (210) facing away from the battery shell (1) has a dimension L1 in the length direction of the battery cover, and the spacing between the two connecting portions (130) in the length direction of the battery cover is L2, and 0.49≤L1 / L2≤0.

89.

6. The battery cover according to claim 3, characterized in that: The portion of the first pole assembly (210) that faces away from the battery shell (1) has a dimension L1 in the length direction of the battery cover, and is directed along the first side (121) toward the second side (122). The portion of the second pole assembly (220) that faces away from the battery shell (1) has a dimension L3, where -1mm≤L3-L1≤41mm.

7. The battery cover according to claim 3, characterized in that: In the length direction of the battery cover, the plate assembly (100) protrudes from the second pole assembly (220).

8. A battery cell, characterized in that The invention comprises a battery shell (1), an electrode group (2) and a battery cover plate according to any one of claims 1 to 7, wherein the battery shell (1) is provided with a communicating accommodating cavity and an opening (11), the electrode group (2) is arranged in the accommodating cavity, and the plate assembly (100) is covered at the opening (11).

9. The battery cell according to claim 8, characterized in that The battery shell (1) includes two first walls (12) arranged opposite to each other, a third protrusion (12d) is provided on the side of the first wall (12) facing the first direction (D1), the surface of the third protrusion (12d) facing the first direction (D1) includes a first plane section (12a) and a slope section (12b), the first plane section (12a) is connected to the slope section (12b), the first plate (110) and the connecting portion (130) are both covered on the first plane sections (12a) of the two first walls (12), and the second plate (120) is covered on the slope sections (12b) of the two first walls (12).

10. The battery cell according to claim 9, characterized in that: The first plate (110), the connecting portion (130), the second plate (120) and the third protrusions (12d) of the two first walls (12) enclose a first capacity expansion space (310) in the battery shell (1); the connecting portion (130) is provided with a second capacity expansion space (131) on the side facing the battery shell (1); the second capacity expansion space (131), the first capacity expansion space (310), the opening (11) and the accommodating cavity are sequentially connected; the pole group (2) is provided with a first protrusion (21) on the side facing the first direction (D1); at least part of the first protrusion (21) is located in the first capacity expansion space (310); the first protrusion (21) is provided with a second protrusion (22) on the side facing the first direction (D1); the second protrusion (22) is located in the second capacity expansion space (131); And / or, the plate assembly (100) further includes a support eave (140), the support eave (140) is connected to the second side (122), the support eave (140) is parallel to the first plate (110), the surface of the third protrusion (12d) facing the first direction (D1) further includes a second plane segment (12c), the second plane segment (12c) is connected to the side of the slope segment (12b) facing away from the first plane segment (12a), the battery shell (1) further includes a second wall (13), In the distribution direction of the first wall bodies (12), both sides of the second wall body (13) are respectively connected to the two first wall bodies (12); the surface of the second wall body (13) facing the first direction (D1) is a third plane segment (13a); the third plane segment (13a) is connected to the side of the second plane segment (12c) facing away from the slope segment (12b); and the supporting eaves (140) are covered on the third plane segment (13a) and the second plane segments (12c) of the two first wall bodies (12).

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