A cover plate assembly and a battery

Abstract

This invention belongs to the field of battery technology and discloses a cover plate assembly and a battery. The cover plate assembly includes a cover plate structure, two terminal modules, and two first insulating members. The cover plate structure is used to cover the first opening of the battery casing. The cover plate structure includes two cover plate bodies, each including a first plate and a second plate. The opposite sides of the first plate are the first side and the second side, respectively. The opposite sides of the second plate are the third side and the fourth side, respectively. In the same cover plate body, the first side and the third side are connected. The second sides of the first plates of the two cover plate bodies are welded together. The second plates of the two cover plate bodies are inclined in a direction away from each other along the direction of the cover plate structure pointing towards the battery casing. Each terminal module is located on the second plate of a corresponding cover plate body. Each first insulating member is located on the side of a corresponding cover plate body facing the battery casing, thereby reducing the assembly difficulty of the cover plate assembly.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a cover plate assembly and a battery. Background Technology

[0002] The prior art provides a cover plate structure that is roughly in the shape of a "Z". Specifically, the cover plate structure includes a flat plate, two inclined plates, a lower plastic piece, and two terminal post assemblies. The two inclined plates are respectively connected to both sides of the flat plate along its length and are oriented towards the battery casing along the cover plate structure. The two inclined plates are inclined in a direction away from each other. The lower plastic piece is connected as a whole to the side of the flat plate facing the battery casing and the side of the two inclined plates facing the battery casing. The two terminal post assemblies correspond one-to-one with the two inclined plates, and each terminal post assembly is located on a corresponding inclined plate.

[0003] However, the assembly of the aforementioned cover plate structure is difficult. For example, when installing the pole post assembly onto the corresponding inclined plate, another inclined plate will interfere with the pole post assembly being assembled; when assembling the lower plastic, flat plate, and inclined plate, the two inclined plates will also interfere with each other. This not only reduces the assembly efficiency of the cover plate structure but also reduces the assembly yield.

[0004] Therefore, there is an urgent need to propose a cover plate assembly and battery to solve the above-mentioned technical problems. Summary of the Invention

[0005] The first objective of this invention is to provide a cover assembly that is relatively easy to assemble.

[0006] To achieve this objective, the present invention adopts the following technical solution: A cover plate assembly, comprising: The cover structure is used to cover the first opening of the battery case. The cover structure includes two cover bodies, each including a first plate and a second plate. The two opposite sides of the first plate are the first side and the second side, respectively. The two opposite sides of the second plate are the third side and the fourth side, respectively. In the same cover body, the first side and the third side are connected. The second sides of the first plates of the two cover bodies are welded together. The second plates of the two cover bodies are inclined in a direction away from each other along the direction of the cover structure pointing towards the battery case. Two pole modules, each corresponding to one of the two cover plate bodies, with each pole module located on the second plate of the corresponding cover plate body; Two first insulating components are provided, each corresponding to one of the two cover plate bodies. Each first insulating component is located on the side of the corresponding cover plate body facing the battery case.

[0007] Optionally, the first plate has a protrusion that protrudes along the direction from the battery case to the cover plate structure. The pole module includes a riveting block structure located on the side of the second plate away from the battery case. The protrusion protrudes from the riveting block structure along the direction from the battery case to the cover plate structure.

[0008] Optionally, a capacity-enhancing groove is provided on the side of the protrusion facing the battery casing, and some of the electrode groups can be embedded in the capacity-enhancing groove.

[0009] Optionally, along the direction from the battery casing to the cover structure, the distance between the fourth side and the side of the protrusion facing away from the first plate is H2, where 31mm≤H2≤109mm.

[0010] Optionally, along the direction from the cover plate structure to the battery case, the area of ​​the orthogonal projection of the first plate onto the first insulating member is S2, and along the direction from the cover plate structure to the battery case, the area of ​​the orthogonal projection of the protrusion onto the first plate is S1, where 0.51≤S1 / S2≤0.89.

[0011] Optionally, the two cover plate bodies, the two pole modules, and the two first insulating components form two semi-finished units respectively. In the same semi-finished unit, the dimension of the second plate body in the direction from the third side to the fourth side is L2, and the dimension of the riveting block structure in the direction from the third side to the fourth side is L3, 0.56≤L3 / L2≤0.94.

[0012] Optionally, the first plate has a through hole, and the protrusion includes a sealing plate and multiple surrounding plates. The multiple surrounding plates are connected end to end and surround the edge of the through hole. A second opening is formed on the side of the multiple surrounding plates away from the through hole. The first plate and the multiple surrounding plates are an integral structure. The sealing plate is fastened and welded to the second opening. An expansion groove is formed between the sealing plate, the through hole and the multiple surrounding plates.

[0013] Optionally, one of the two cover plates has a protrusion on its second side, and the other has a slot on its second side, with the protrusion inserted into the slot.

[0014] A second objective of the present invention is to provide a battery whose cover assembly has low assembly difficulty.

[0015] To achieve this objective, the present invention adopts the following technical solution: The battery includes a battery casing, an electrode assembly, and the aforementioned cover plate assembly. The battery casing has a communicating receiving cavity and a first opening. The electrode assembly includes an electrode assembly body located within the receiving cavity. The cover plate structure covers the first opening.

[0016] Optionally, the width direction of the battery casing is a first direction, the thickness direction of the battery casing is a second direction, and the length direction of the battery casing is a third direction. The two cover plate bodies of the cover plate structure are arranged opposite to each other along the first direction. The first plate body includes a reduced thickness area and a non-reduced thickness area. The size of the reduced thickness area in the second direction is smaller than the size of the non-reduced thickness area in the second direction. The reduced thickness area and the non-reduced thickness area are distributed and connected along the first direction. The reduced thickness area faces the second side. In the second direction, the cover plate structure forms a notch at the connection of the two cover plate bodies. The battery casing has a raised portion in at least the area facing the first opening. The battery casing has a raised portion on at least one side along the second direction. The raised portion protrudes in the direction towards the receiving cavity. The raised portion and the notch are arranged opposite to each other along the third direction.

[0017] The beneficial effects of this invention are: The cover plate structure includes two cover plate bodies, two pole post modules, and two first insulating components, each corresponding to one another. The second sides of the first plates of the two cover plate bodies are welded together. Therefore, in actual production, one cover plate body, one pole post module, and one first insulating component can be treated as an independent semi-finished unit. The cover plate body, pole post module, and first insulating component in the semi-finished unit are assembled first, and then the cover plate bodies of the two semi-finished units are assembled and welded together. This avoids the problem of one of the two semi-finished units interfering with the assembly of the other with the corresponding pole post module and the corresponding first insulating component, which helps to reduce the assembly difficulty of the cover plate assembly and thus improve the assembly efficiency and yield of the cover plate assembly. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the battery structure provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the cover plate assembly provided in an embodiment of the present invention; Figure 3 This is an exploded structural diagram of the semi-finished product unit provided in an embodiment of the present invention; Figure 4 This is a first structural schematic diagram of a semi-finished product unit provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of another semi-finished unit provided in an embodiment of the present invention; Figure 6 This is a cross-sectional structural diagram of the battery provided in an embodiment of the present invention; Figure 7 This is a cross-sectional structural diagram of the semi-finished product unit provided in an embodiment of the present invention; Figure 8 This is a partially enlarged structural schematic diagram of the battery casing provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of the second structure of a semi-finished product unit provided in an embodiment of the present invention; Figure 10 This is a cross-sectional structural diagram of the cover plate assembly provided in an embodiment of the present invention.

[0019] In the picture: D1, First Direction; D2, Second Direction; D3, Third Direction; 10. Cover assembly; 20. Battery casing; 21. First opening; 22. Raised portion; 31. Electrode assembly body; 32. First capacity-enhancing portion; 33. Second capacity-enhancing portion; 34. Electrode tab; 100. Cover plate structure; 110. Cover plate body; 111. First plate; 1111. First side; 1112. Second side; 1112a. Protrusion; 1112b. Slot; 1113. Protrusion; 1113a. Capacity expansion slot; 1113b. Sealing plate; 1113c. Enclosing plate; 1113d. Second opening; 1114. Thickening area; 1115. Non-thickening area; 112. Second plate; 1121. Third side; 1122. Fourth side; 120. Notch; 200. Pole post module; 210. Riveting block structure; 211. Second insulating component; 212. Riveting block; 220. Pole post; 221. Base plate; 222. Column; 300. First insulating component; 400. Semi-finished unit. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should also be noted that, for ease of description, only the parts relevant to the present invention are shown in the drawings, not the entire structure. It is understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it.

[0021] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0024] This embodiment provides a cover plate assembly that is relatively easy to assemble.

[0025] Specifically, such as Figures 1 to 3 As shown, the cover assembly 10 includes a cover structure 100, two terminal modules 200, and two first insulating members 300. The cover structure 100 is used to cover the first opening 21 of the battery casing 20. The cover structure 100 includes two cover bodies 110, each including a first plate 111 and a second plate 112. The opposite sides of the first plate 111 are a first side 1111 and a second side 1112, respectively. The opposite sides of the second plate 112 are a third side 1121 and a fourth side 1122, respectively. Within the same cover body 110, the first side 1111 and the third side 1122 are... 121 connection, the second sides 1112 of the first plates 111 of the two cover plate bodies 110 are welded together, along the direction of the cover plate structure 100 pointing towards the battery case 20, the second plates 112 of the two cover plate bodies 110 are inclined in a direction away from each other, the two terminal modules 200 correspond one-to-one with the two cover plate bodies 110, each terminal module 200 is located on the second plate 112 of the corresponding cover plate body 110, and the two first insulating members 300 correspond one-to-one with the two cover plate bodies 110, each first insulating member 300 is located on the side of the corresponding cover plate body 110 facing the battery case 20.

[0026] Based on the above design, the cover plate structure 100 includes two cover plate bodies 110. The two cover plate bodies 110, two pole post modules 200, and two first insulating components 300 correspond one-to-one. The second sides 1112 of the first plates 111 of the two cover plate bodies 110 are welded together. Therefore, in actual production, one cover plate body 110, one pole post module 200, and one first insulating component 300 can be considered as an independent semi-finished unit 400. The cover plate body 110, pole post module 200, and first insulating component 300 in the semi-finished unit 400 are first assembled. For example, in one semi-finished unit 400… The terminal module 200 is installed onto the second plate 112, and the second insulating component 211 is installed onto the side of the cover plate body 110 facing the battery case 20 (i.e., the side of the first plate 111 facing the battery case 20 and the side of the second plate 112 facing the battery case 20). Then, the cover plate bodies 110 of the two semi-finished units 400 are assembled and welded together. This avoids the problem of one of the two semi-finished units 400 interfering with the assembly of the other with the corresponding terminal module 200 and the corresponding first insulating component 300. This helps to reduce the assembly difficulty of the cover plate assembly 10, thereby improving the assembly efficiency and assembly yield of the cover plate assembly 10.

[0027] On the other hand, the two pole modules 200 on the cover plate assembly 10 are respectively located on the two second plates 112, and the two second plates 112 are respectively located on opposite sides of the cover plate structure 100. This makes the positions of the two pole modules 200 on the cover plate structure 100 relatively dispersed. This structure can avoid the heat on the cover plate structure 100 being too concentrated and is conducive to the rapid heat dissipation of the pole modules 200.

[0028] Optionally, such as Figures 1 to 5 As shown, in the two cover plate bodies 110, one of them has a protrusion 1112a on its second side 1112, and the other has a slot 1112b on its second side 1112. The protrusion 1112a is inserted into the slot 1112b, which can improve the positioning accuracy of the two cover plate bodies 110. When assembling the two cover plate bodies 110, the two cover plate bodies 110 can be quickly positioned, which is conducive to further improving the assembly efficiency.

[0029] Optionally, such as Figures 1 to 7As shown, the first plate 111 has a protrusion 1113, which protrudes along the direction from the battery case 20 to the cover structure 100. The terminal module 200 includes a riveting block structure 210, which is located on the side of the second plate 112 away from the battery case 20. The protrusion 1113 protrudes from the riveting block structure 210 along the direction from the battery case 20 to the cover structure 100. On the one hand, the protrusion 1113 can protect the riveting block structure 210, reducing the probability of the riveting block structure 210 being bumped during the manufacturing process, thereby improving the yield of the cover assembly 10 and the battery production. On the other hand, the protrusion 1113 can improve the structural strength of the first plate 111, thereby reducing the probability of deformation of the first plate 111, which is beneficial to improving the assembly yield of the two cover bodies 110, and also beneficial to improving the assembly yield of the cover structure 100 and the battery case 20.

[0030] Furthermore, the side of the rivet block structure 210 facing away from the second plate 112 is used for conductive connection with the busbar (not shown in the figure). Along the direction from the battery case 20 to the cover plate structure 100, the protrusion 1113 can protrude from the busbar so that the protrusion 1113 can protect the busbar and reduce the probability of the busbar being bumped during the manufacturing process.

[0031] Furthermore, the protrusion 1113 has a capacity-enhancing groove 1113a on the side facing the battery casing 20, and a portion of the electrode assembly can be embedded in the capacity-enhancing groove 1113a. For example, as shown... Figure 6 As shown, the electrode assembly includes an electrode assembly body 31 and a first capacity-enhancing part 32. The electrode assembly body 31 is located inside the battery casing 20, and the first capacity-enhancing part 32 is embedded in the capacity-enhancing groove 1113a. It is evident that the capacity-enhancing groove 1113a provides additional expansion space for the electrode assembly, increasing its volume and thus improving its capacity. This is beneficial for meeting the demands of high-rate fast charging of the battery. Furthermore, the capacity-enhancing groove 1113a on the protruding part 1113 fully utilizes the space on the cover plate assembly 10, improving the battery's space utilization and thus increasing its energy density. Secondly, the structure of the first capacity-enhancing part 32 embedded in the capacity-enhancing groove 1113a allows the cover plate structure 100 to limit the electrode assembly, reducing the probability of displacement within the battery casing 20 and thus improving battery reliability and safety. Thirdly, the capacity-enhancing groove 1113a reduces the weight of the first plate 111, thereby reducing the weight of the cover plate assembly 10 and further improving the battery's energy density.

[0032] It should be noted that the cover plate structure 100 includes two cover plate bodies 110. Each cover plate body 110 has a capacity-enhancing groove 1113a on its protrusion 1113. Therefore, the cover plate structure 100 includes two capacity-enhancing grooves 1113a. Consequently, two first capacity-enhancing parts 32 are provided on the side of the pole assembly body 31 facing the cover plate structure 100. The two first capacity-enhancing parts 32 correspond one-to-one with the two capacity-enhancing grooves 1113a.

[0033] Optionally, the riveting block structure 210 includes a second insulating member 211 and a riveting block 212. In the same semi-finished product unit 400, the second insulating member 211 is located on the side of the second plate 112 away from the battery case 20. The side of the second insulating member 211 away from the second plate 112 is provided with a mounting groove. The riveting block 212 is fixed in the mounting groove and is used for welding with the busbar.

[0034] Optionally, the pole module 200 further includes a pole 220, which includes a base plate 221 and a pole body 222. In the same semi-finished unit 400, a first insulating member 300 is sandwiched between a second plate 112 and a base plate 221. The base plate 221 is used for welding to the pole lugs 34 of the pole assembly. One end of the pole body 222 is connected to the base plate 221, and the other end passes through the first insulating member 300, the second plate 112, and the second insulating member 211, and is riveted and fixed to the riveting block 212.

[0035] Furthermore, the column 222 is cylindrical to increase the connection area between the base plate 221 and the rivet block 212 and the column 222, thereby increasing the flow rate of the column 222 and improving the flow capacity of the cover plate assembly 10.

[0036] In another embodiment, in the same semi-finished product unit 400, along the direction perpendicular to the second plate 112, the orthographic projection of the column 222 on the second plate 112 is elliptical, and the major axis of the ellipse is parallel to the direction of the third side 1121 pointing to the fourth side 1122, so as to increase the connection area between the base plate 221 and the riveting block 212 and the column 222.

[0037] Optionally, the first plate 111 has a through hole, and the protrusion 1113 includes a sealing plate 1113b and multiple surrounding plates 1113c. The multiple surrounding plates 1113c are connected end to end and surround the edge of the through hole. A second opening 1113d is formed on the side of the multiple surrounding plates 1113c away from the through hole. The first plate 111 and the multiple surrounding plates 1113c are an integral structure. The sealing plate 1113b is fastened and welded to the second opening 1113d. A capacity-enhancing groove 1113a is formed between the sealing plate 1113b, the through hole, and the multiple surrounding plates 1113c. In actual production, the first plate 111 can be stamped first to form the through hole and the surrounding plates 1113c. Then, the sealing plate 1113b is fastened to the second opening 1113d, and the sealing plate 1113b and the multiple surrounding plates 1113c are welded together. Compared to the process of directly stamping the expansion groove 1113a on the first plate 111, this stamping through hole process is more efficient and has a higher yield, which helps to reduce the forming difficulty of the protrusion 1113, thereby improving the forming yield and forming efficiency of the protrusion 1113.

[0038] This embodiment also provides a battery, which includes a battery casing 20, an electrode assembly, and the aforementioned cover plate assembly 10. The battery casing 20 has a communicating receiving cavity and a first opening 21. The electrode assembly includes an electrode assembly body 31 located within the receiving cavity. The cover plate structure 100 covers the first opening 21. This battery uses the aforementioned cover plate assembly 10, which has low assembly difficulty, improving assembly efficiency and yield, thereby contributing to improved battery production efficiency and yield.

[0039] On the other hand, the battery uses the aforementioned cover assembly 10. Since the second plates 112 of the two cover bodies 110 are inclined in a direction away from each other along the direction from the cover structure 100 to the battery casing 20, a capacity-enhancing space is formed between the two cover bodies 110 and the battery casing 20. This provides additional capacity-enhancing space for the electrode assembly, thereby increasing the electrode assembly volume and improving its capacity. Specifically, as... Figure 6 As shown, the electrode assembly also includes a second capacity-enhancing section 33, which protrudes from the electrode assembly body 31 on the side facing the cover structure 100. A first capacity-enhancing section 32 protrudes from the second capacity-enhancing section 33 on the side facing away from the electrode assembly body 31. The second capacity-enhancing section 33 is located within the capacity-enhancing space. This mechanism improves the space utilization of the battery, achieving the effect of increasing the battery energy density. It also increases the electrode assembly volume, achieving the effect of increasing the electrode assembly capacity, which is beneficial for meeting the demand for high-rate fast charging of the battery.

[0040] It should be noted that in this embodiment, the battery casing 20 is provided with two first openings 21, which are located on both sides of the length direction (i.e., the third direction D3) of the battery casing 20. Therefore, there are two cover plate assemblies 10, and the two cover plate assemblies 10 correspond one-to-one with the two first openings 21. The cover plate structure 100 of each cover plate assembly 10 covers the corresponding first opening 21. Each cover plate assembly 10 and the battery casing 20 are provided with a capacity expansion space. The electrode assembly body 31 is provided with a second capacity expansion part 33 protruding from both ends on the third direction D3. That is, the electrode assembly has two second capacity expansion parts 33, and each second capacity expansion part 33 is located in the corresponding capacity expansion space. In this embodiment, the direction in which the cover structure 100 points to the battery case 20 refers to the direction in which the cover structure 100 of the cover assembly 10 points to the battery case 20. Similarly, the direction in which the battery case 20 points to the cover structure 100 refers to the direction in which the battery case 20 points to the cover structure 100 of the cover assembly 10.

[0041] Optionally, such as Figures 1 to 8 As shown, the width direction of the battery casing 20 is the first direction D1, the thickness direction of the battery casing 20 is the second direction D2, and the length direction of the battery casing 20 is the third direction D3. The two cover plate bodies 110 of the cover plate structure 100 are arranged opposite each other along the first direction D1. The first plate body 111 includes a reduced thickness area 1114 and a non-reduced thickness area 1115. The size of the reduced thickness area 1114 in the second direction D2 is smaller than the size of the non-reduced thickness area 1115 in the second direction D2. The reduced thickness area 1114 and the non-reduced thickness area 1115 are distributed and connected along the first direction D1, and the non-reduced thickness area 1115 faces... On the first side 1111, the thickened area 1114 faces the second side 1112. Consequently, the cover plate structure 100 forms a notch 120 at the connection point of the two cover plate bodies 110 (i.e., the connection point of the two first plates 111). The notch 120 is located on the side wall of the cover plate structure 100 in the second direction D2. The battery casing 20 has a raised portion 22 at least in the area facing the first opening 21. The battery casing 20 has a raised portion 22 on at least one side along the second direction D2. The raised portion 22 protrudes in the direction towards the receiving cavity. The raised portion 22 and the notch 120 are directly opposite each other along the third direction D3. When assembling the cover plate assembly 10 and the battery casing 20, the raised portion 22 and the notch 120 enable the cover plate assembly 10 to be positioned quickly and accurately, which not only improves the assembly accuracy of the cover plate structure 100 and the battery casing 20 but also improves the assembly efficiency of both.

[0042] In this embodiment, the non-thickness-reducing area 1115 protrudes from both sides of the thickness-reducing area 1114 in the second direction D2. Therefore, the cover structure 100 has notches 120 on both sides of the second direction D2, and the battery case 20 has protrusions 22 on both sides of the second direction D2. Each protrusion 22 is directly opposite to a corresponding notch 120 in the third direction D3. Thus, the notches 120 and protrusions 22 on the same side of the second direction D2 form a set of positioning structures. The cover structure 100 and the battery case 20 can achieve precise positioning through these two sets of positioning structures, further improving the assembly accuracy of the cover structure 100 and the battery case 20. Alternatively, in other embodiments, the non-thickness-reducing area 1115 may protrude from one side of the thickness-reducing area 1114 in the second direction D2, while the other side is flush with the thickness-reducing area 1114. The battery case 20 may have a protrusion 22 on one side of the second direction D2, in which case the battery has a set of positioning structures.

[0043] Optionally, the two terminal modules 200 on the same cover assembly 10 have the same polarity, while the terminal modules 200 on the two cover assemblies 10 located at opposite ends of the battery casing 20 along its length have opposite polarities. That is, the battery has a total of four terminal modules 200, and these four modules are grouped in pairs, with the two terminal modules 200 in each group having the same polarity. Each second capacity-enhancing section 33 has tabs 34 on both sides along the first direction D1, and each tab 34 is electrically connected to a corresponding terminal module 200. In this structure, two terminal modules 200 of the same polarity are provided. By increasing the number of terminal modules 200, the flow rate of the cover assembly 10 and the electrode group is increased, which is beneficial for meeting the requirements of high-rate fast charging of the battery.

[0044] Optionally, such as Figures 1 to 10As shown, along the direction from the battery casing 20 to the cover structure 100 (i.e., third direction D3), the distance between the fourth side 1122 of the second plate 112 and the side of the protrusion 1113 facing away from the first plate 111 is H2, 31mm≤H2≤109mm. For example, H2 can be 31mm, 40mm, 55mm, 68mm, 73mm, 100mm, or 109mm, etc. If H2 is too small, i.e., H2 is less than 31mm, the size of the second plate 112 in the third direction D3 will be too small. This will reduce the mounting area of ​​the terminal module 200 on the second plate 112, thereby reducing the volume of the terminal module 200, lowering the current carrying capacity of the cover assembly 10, and hindering the ability to meet the high-rate fast charging requirements of the battery. Furthermore, a small H2 will reduce the size of the protrusion 1113 protruding from the riveting block structure 210, reducing the protective effect of the protrusion 1113 on the riveting block structure 210. If H2 is too large, i.e., H2 is greater than 109 mm, then the dimensions of the protrusion 1113 and / or the second plate 112 in the third direction D3 will be too large. This will increase the material usage of the cover body 110, which will not only increase production costs but also increase the weight of the cover body 110, thereby reducing the battery energy density. In addition, the excessive dimensions of the protrusion 1113 and / or the second plate 112 in the third direction D3 will increase the molding difficulty of the cover body 110, thereby reducing production efficiency and production yield.

[0045] Optionally, along the direction from the cover structure 100 to the battery case 20, the area of ​​the orthographic projection of the first plate 111 onto the first insulating member 300 is S2 (S2 is in mm). 2 Along the direction from the cover structure 100 to the battery case 20 (i.e., third direction D3), the area of ​​the protrusion 1113 projected onto the first plate 111 is S1 (S1 is in mm). 2 ), 0.51≤S1 / S2≤0.89. For example, S1 / S2 can be 0.51, 0.6, 0.73, 0.85 or 0.89, etc. If S1 / S2 is too small, that is, S1 / S2 is less than 0.51, then S1 is too small, and the volume of the capacity expansion groove 1113a is too small. This will result in the volume of the first capacity expansion part 32 being too small. On the one hand, it will reduce the increase in the volume and capacity of the electrode group, which is not conducive to meeting the high-rate fast charging requirements of the battery. On the other hand, it will make the structural strength of the first capacity expansion part 32 too small, and the first capacity expansion part 32 embedded in the capacity expansion groove 1113a is prone to deformation, which reduces the limiting effect of the cover plate assembly 10 on the electrode group. If S1 / S2 is too large, i.e. S1 / S2 is greater than 0.89, the distance between the protrusion 1113 and the edge of the first plate 111 will be too small, resulting in insufficient space for pressing material during stamping. This will significantly increase the forming difficulty of the protrusion 1113 and reduce the forming yield and forming efficiency of the protrusion 1113.

[0046] Optionally, the two cover plate bodies 110, the two pole post modules 200, and the two first insulating members 300 respectively form two semi-finished units 400. In the same semi-finished unit 400, the dimension of the second plate body 112 in the direction from the third side 1121 to the fourth side 1122 is L2. In the same semi-finished unit 400, the riveting block structure 210 is parallel to the second plate body 112, and the dimension of the riveting block structure 210 in the direction from the third side 1121 to the fourth side 1122 is L3, where 0.56 ≤ L3 / L2 ≤ 0.94. For example, L3 / L2 can be 0.56, 0.65, 0.77, 0.83, 0.9, or 0.94, etc. If L3 / L2 is too small, i.e., L3 / L2 is less than 0.56, then L3 is too small. This will result in an insufficient connection area between the riveting block structure 210 and the busbar, thereby reducing the flow rate between the riveting block structure 210 and the busbar. Consequently, the current carrying capacity of the cover plate assembly 10 will be too small, which is not conducive to meeting the high-rate fast charging requirements of the battery. If L3 / L2 is too large, i.e., L3 / L2 is greater than 0.94, then L3 is too large. This will reduce the size of the protrusion 1113 protruding from the riveting block structure 210, thereby reducing the protective effect of the protrusion 1113 on the riveting block structure 210 and increasing the probability of the riveting block structure 210 being bumped during the manufacturing process.

[0047] Optionally, the protrusion 1113 has a dimension of L1 in the first direction D1, where 5mm ≤ L2 - L1 ≤ 30mm. For example, L2 - L1 can be 5mm, 15mm, or 30mm, etc.

[0048] Optionally, along the third direction D3, the distance between the side of the protrusion 1113 facing away from the first plate 111 and the side of the first plate 111 facing away from the protrusion 1113 is H1, where 15mm ≤ H1 ≤ 60mm. For example, H1 can be 15mm, 35mm, 53mm, or 60mm, etc. This ensures that the protrusion 1113 protrudes from the first plate 111 by an appropriate size, thereby enabling the protrusion 1113 to provide reliable protection for the riveting block structure 210, while also ensuring that the protrusion 1113 has reliable structural strength.

[0049] Optionally, the dimension of the thickened area 1114 in the first direction D1 is W, and the dimension of the first plate 111 in the first direction D1 is E, where 0.15 ≤ W / E ≤ 0.4. For example, W / E can be 0.15, 0.3, or 0.4, etc. If W / E is too small, i.e., W / E is less than 0.15, then W is too small, which will result in the notch 120 being too small in the first direction D1, increasing the positioning difficulty of the cover assembly 10 and the battery case 20 during assembly. If W / E is too large, i.e., W / E is greater than 0.4, then W is too large, and the dimension of the non-thickened area 1115 in the first direction D1 is too small. This will reduce the structural strength of the first plate 111, increase the probability of deformation of the first plate 111, and thus reduce the assembly yield of the cover assembly 10 and the battery.

[0050] Optionally, the reduced thickness region 1114 has a dimension of B1 in the second direction D2, and the non-reduced thickness region 1115 and the second plate 112 both have a dimension of B2 in the second direction D2, where 16mm ≤ B2 - B1 ≤ 30mm. For example, B2 - B1 can be 16mm, 20mm, or 30mm, etc. This ensures that the reduced thickness region 1114 has a suitable dimension in the second direction D2, ensuring that the reduced thickness region 1114 has reliable structural strength, while ensuring that the notch 120 has sufficient depth space to cooperate with the raised portion 22 for positioning.

[0051] Optionally, the distance between the protrusions 1113 of the two cover plates 110 facing each other on the first direction D1 is K, 12mm≤K≤25mm. For example, K can be 12mm, 20mm or 25mm, etc.

[0052] Optionally, the included angle between the second plate 112 of the two cover plate bodies 110 is N, 60°≤N≤120°. For example, N can be 60°, 100° or 120°, etc.

[0053] Optionally, the thickness of the sealing plate 1113b is T, where 1.5mm ≤ T1 ≤ 3mm. For example, T1 can be 1.5mm, 2mm, or 3mm, etc.

[0054] In this embodiment, the battery casing 20 and the cover plate body 110 are manufactured using metal stamping or stretching processes, the first insulating component 300 and the second insulating component 211 are manufactured using injection molding, and the electrode tab 34 and the base plate 221 are connected using laser welding. The aforementioned metal stretching, injection molding, and laser welding processes are all common production processes in the field, which are conducive to achieving mass automated production.

[0055] Table 1 below provides six sets of embodiments and six sets of comparative examples. In the six sets of embodiments and six sets of comparative examples, the battery casing 20 is made of aluminum, the insulating film wrapped around the outer surface of the electrode group is polypropylene (PP) film, the second insulating component 211 is made of polyphenylene sulfide (PPS) material, and the first insulating component 300 is made of PP material. In Example 1, H1 is 15mm, H2 is 40mm, W / E is 0.15, S1 / S2 is 0.6, L3 / L2 is 0.65, L2-L1 is 5mm, B2-B1 is 16mm, K is 12mm, N is 60°, T is 1.5mm, and the battery yield is >98%. No abnormalities were found, such as abnormal assembly of the cover assembly 10, abnormal positioning of the cover assembly 10 and the battery casing 20, or abnormal structural strength of the cover assembly 10. The protrusions 1113, electrode groups, and tabs 34 were all undamaged and undeformed. The current carrying capacity and temperature of the cover assembly 10 meet the requirements for high-rate fast charging of the battery.

[0056] In Example 2, H1 is 24mm, H2 is 47mm, W / E is 0.18, S1 / S2 is 0.64, L3 / L2 is 0.69, L2-L1 is 9mm, B2-B1 is 22mm, K is 14mm, N is 75°, T is 1.8mm, and the battery yield is >98%. No abnormalities were found, such as abnormal assembly of the cover assembly 10, abnormal positioning of the cover assembly 10 and the battery casing 20, or abnormal structural strength of the cover assembly 10. The protrusions 1113, electrode groups, and tabs 34 were all undamaged and undeformed. The overcurrent capacity and temperature of the cover assembly 10 meet the requirements for high-rate fast charging of the battery.

[0057] In Example 3, H1 is 30mm, H2 is 55mm, W / E is 0.24, S1 / S2 is 0.68, L3 / L2 is 0.75, L2-L1 is 16mm, B2-B1 is 35mm, K is 17mm, N is 90°, T is 2mm, and the battery yield is >98%. No abnormalities were found, such as abnormal assembly of the cover assembly 10, abnormal positioning of the cover assembly 10 and the battery casing 20, or abnormal structural strength of the cover assembly 10. The protrusions 1113, electrode groups, and tabs 34 were all undamaged and undeformed. The overcurrent capacity and temperature of the cover assembly 10 meet the requirements for high-rate fast charging of the battery.

[0058] In Example 4, H1 is 36mm, H2 is 72mm, W / E is 0.29, S1 / S2 is 0.72, L3 / L2 is 0.8, L2-L1 is 22mm, B2-B1 is 45mm, K is 19mm, N is 100°, T is 2.5mm, and the battery yield is >98%. No abnormalities were found, such as abnormal assembly of the cover assembly 10, abnormal positioning of the cover assembly 10 and the battery casing 20, or abnormal structural strength of the cover assembly 10. The protrusions 1113, electrode groups, and tabs 34 were all undamaged and undeformed. The overcurrent capacity and temperature of the cover assembly 10 meet the requirements for high-rate fast charging of the battery.

[0059] In Example 5, H1 is 42mm, H2 is 85mm, W / E is 0.36, S1 / S2 is 0.8, L3 / L2 is 0.84, L2-L1 is 26mm, B2-B1 is 52mm, K is 22mm, N is 110°, T is 2.8mm, and the battery yield is >98%. No abnormalities were found, such as abnormal assembly of the cover assembly 10, abnormal positioning of the cover assembly 10 and the battery casing 20, or abnormal structural strength of the cover assembly 10. The protrusions 1113, electrode groups, and tabs 34 were all undamaged and undeformed. The overcurrent capacity and temperature of the cover assembly 10 meet the requirements for high-rate fast charging of the battery.

[0060] In Example 6, H1 is 60mm, H2 is 100mm, W / E is 0.4, S1 / S2 is 0.85, L3 / L2 is 0.9, L2-L1 is 30mm, B2-B1 is 60mm, K is 25mm, N is 120°, T is 3mm, and the battery yield is >98%. No abnormalities were found, such as abnormal assembly of the cover assembly 10, abnormal positioning of the cover assembly 10 and the battery casing 20, or abnormal structural strength of the cover assembly 10. The protrusions 1113, electrode groups, and tabs 34 were all undamaged and undeformed. The overcurrent capacity and temperature of the cover assembly 10 meet the requirements for high-rate fast charging of the battery.

[0061] In Comparative Example 1, H1 is 30mm, H2 is 30mm, W / E is 0.24, S1 / S2 is 0.68, L3 / L2 is 0.75, L2-L1 is 16mm, B2-B1 is 35mm, K is 17mm, N is 90°, T is 2mm, and the battery yield is <98%. The cover plate assembly 10 has low current carrying capacity and cannot meet the high-rate fast charging requirements of the battery. The protrusion 1113 provides poor protection for the riveting block structure 210, which is prone to deformation from impacts.

[0062] In Comparative Example 2, H1 is 30mm, H2 is 110mm, W / E is 0.24, S1 / S2 is 0.68, L3 / L2 is 0.75, L2-L1 is 16mm, B2-B1 is 35mm, K is 17mm, N is 90°, and T is 2mm. The battery yield is <98%. The cover plate assembly 10 has high production cost, heavy weight, and low battery energy density. The cover plate body 110 is difficult to mold, has low production efficiency, and low production yield.

[0063] In Comparative Example 3, H1 is 30mm, H2 is 55mm, W / E is 0.24, S1 / S2 is 0.5, L3 / L2 is 0.75, L2-L1 is 16mm, B2-B1 is 35mm, K is 17mm, N is 90°, T is 2mm, and the battery yield is <98%. The increase in electrode assembly volume and capacity is small, which cannot meet the high-rate fast charging requirements of the battery. The cover assembly 10 has poor limiting effect on the electrode assembly, and the electrode assembly is prone to shifting and moving within the battery casing 20.

[0064] In Comparative Example 4, H1 is 30mm, H2 is 55mm, W / E is 0.24, S1 / S2 is 0.9, L3 / L2 is 0.75, L2-L1 is 16mm, B2-B1 is 35mm, K is 17mm, N is 90°, T is 2mm, and the battery yield is <98%. The protrusion 1113 is difficult to form, and the forming yield and forming efficiency of the protrusion 1113 are low.

[0065] In Comparative Example 5, H1 is 30mm, H2 is 55mm, W / E is 0.24, S1 / S2 is 0.68, L3 / L2 is 0.55, L2-L1 is 16mm, B2-B1 is 35mm, K is 17mm, N is 90°, T is 2mm, and the battery yield is <98%. The overcurrent capacity of the cover plate assembly 10 is too small to meet the high-rate fast charging requirements of the battery.

[0066] In Comparative Example 6, H1 is 30mm, H2 is 55mm, W / E is 0.24, S1 / S2 is 0.68, L3 / L2 is 0.95, L2-L1 is 16mm, B2-B1 is 35mm, K is 17mm, N is 90°, T is 2mm, and the battery yield is <98%. The protrusion 1113 provides poor protection for the riveting block structure 210, and the riveting block structure 210 is easily damaged during the manufacturing process.

[0067] It is evident that when 15mm≤H1≤60mm, 31mm≤H2≤109mm, 0.15≤W / E≤0.4, 0.51≤S1 / S2≤0.89, 0.56≤L3 / L2≤0.94, 5mm≤L2-L1≤30mm, 16mm≤B2-B1≤30mm, 12mm≤K≤25mm, 60°≤N≤120°, and 1.5mm≤T1≤3mm, the assembly difficulty of the cover plate assembly 10 can be reduced, the production yield and efficiency of the cover plate assembly 10 can be improved, the assembly yield of the cover plate assembly 10 and the battery case 20 can be increased, the electrode group volume and capacity can be increased, and the overcurrent capacity of the cover plate assembly 10 can be taken into account to meet the high-rate fast charging requirements of the battery and ensure that the production yield of the battery reaches more than 98%.

[0068] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A cover plate assembly, characterized in that, include: A cover structure (100) is provided to cover the first opening (21) of the battery casing (20). The cover structure (100) includes two cover bodies (110), each cover body (110) including a first plate (111) and a second plate (112). The opposite sides of the first plate (111) are the first side (1111) and the second side (1112), respectively. The opposite sides of the second plate (112) are the third side (1111) and the second side (1112), respectively. Side (1121) and fourth side (1122), in the same cover body (110), the first side (1111) is connected to the third side (1121), the second side (1112) of the first plate (111) of the two cover bodies (110) are welded together, along the direction of the cover structure (100) pointing to the battery case (20), the second plate (112) of the two cover bodies (110) are inclined in a direction away from each other; Two pole post modules (200) are provided, and the two pole post modules (200) correspond one-to-one with the two cover plate bodies (110). Each pole post module (200) is located on the second plate body (112) of the corresponding cover plate body (110). Two first insulating elements (300) are provided, each corresponding to one of the two cover plate bodies (110). Each first insulating element (300) is located on the side of the corresponding cover plate body (110) facing the battery case (20).

2. The cover plate assembly according to claim 1, characterized in that, The first plate (111) is provided with a protrusion (1113), which protrudes along the direction from the battery case (20) to the cover plate structure (100). The pole module (200) includes a riveting block structure (210), which is located on the side of the second plate (112) away from the battery case (20) and along the direction from the battery case (20) to the cover plate structure (100). The protrusion (1113) protrudes from the riveting block structure (210).

3. The cover plate assembly according to claim 2, characterized in that, The protrusion (1113) has a capacity-enhancing groove (1113a) on the side facing the battery case (20), and some of the electrode groups can be embedded in the capacity-enhancing groove (1113a).

4. The cover plate assembly according to claim 2, characterized in that, Along the direction from the battery case (20) to the cover structure (100), the distance between the fourth side (1122) and the side of the protrusion (1113) away from the first plate (111) is H2, 31mm≤H2≤109mm.

5. The cover plate assembly according to claim 2, characterized in that, Along the direction from the cover structure (100) to the battery case (20), the area of ​​the orthogonal projection of the first plate (111) onto the first insulating member (300) is S2, and along the direction from the cover structure (100) to the battery case (20), the area of ​​the orthogonal projection of the protrusion (1113) onto the first plate (111) is S1, 0.51≤S1 / S2≤0.

89.

6. The cover plate assembly according to claim 2, characterized in that, The two cover plate bodies (110), the two pole post modules (200), and the two first insulating components (300) respectively form two semi-finished units (400). In the same semi-finished unit (400), the second plate body (112) has a dimension of L2 in the direction from the third side (1121) to the fourth side (1122), and the riveting block structure (210) has a dimension of L3 in the direction from the third side (1121) to the fourth side (1122), where 0.56≤L3 / L2≤0.

94.

7. The cover plate assembly according to any one of claims 3-6, characterized in that, The first plate (111) is provided with a through hole. The protrusion (1113) includes a sealing plate (1113b) and a plurality of surrounding plates (1113c). The plurality of surrounding plates (1113c) are connected end to end and surround the edge of the through hole. A second opening (1113d) is formed on the side of the plurality of surrounding plates (1113c) away from the through hole. The first plate (111) and the plurality of surrounding plates (1113c) are an integral structure. The sealing plate (1113b) is fastened and welded to the second opening (1113d). The capacity-enhancing groove (1113a) is formed between the sealing plate (1113b), the through hole and the plurality of surrounding plates (1113c).

8. The cover plate assembly according to any one of claims 1-6, characterized in that, Of the two cover bodies (110), one has a protrusion (1112a) on its second side (1112) and the other has a slot (1112b) on its second side (1112), with the protrusion (1112a) inserted into the slot (1112b).

9. A battery, characterized in that, The battery includes a battery housing (20), an electrode assembly, and a cover assembly (10) as described in any one of claims 1-8. The battery housing (20) has a communicating receiving cavity and a first opening (21). The electrode assembly includes an electrode assembly body (31) located within the receiving cavity. The cover structure (100) covers the first opening (21).

10. The battery according to claim 9, characterized in that, The width direction of the battery casing (20) is a first direction (D1), the thickness direction of the battery casing (20) is a second direction (D2), and the length direction of the battery casing (20) is a third direction (D3). The two cover bodies (110) of the cover structure (100) are arranged opposite to each other along the first direction (D1). The first plate body (111) includes a reduced thickness area (1114) and a non-reduced thickness area (1115). The size of the reduced thickness area (1114) in the second direction (D2) is smaller than the size of the non-reduced thickness area (1115) in the second direction (D2). The reduced thickness area (1114) and the non-reduced thickness area (1115) are... The thickened area (1114) is distributed and connected along the first direction (D1), and faces the second side (1112). In the second direction (D2), the cover structure (100) forms a notch (120) at the connection of the two cover bodies (110). The battery case (20) has a raised portion (22) at least in the area facing the first opening (21). The battery case (20) has the raised portion (22) on at least one side along the second direction (D2). The raised portion (22) protrudes in the direction towards the receiving cavity. The raised portion (22) and the notch (120) are arranged opposite each other along the third direction (D3).

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