Battery cell cover plate and battery cell

Abstract

The application relates to the battery technical field and provides a battery cell cover plate and a battery cell. The battery cell cover plate comprises a cover plate body, a supporting table and a mounting table are formed by bending, one side of the cover plate body is provided with a reference surface, the supporting table and the mounting table are arranged on the reference surface and are arranged along the length direction of the cover plate body, the mounting table is provided with a through hole, a pole is arranged in the through hole and protrudes from the mounting table, in the thickness direction of the cover plate body, the height of the supporting table relative to the reference surface is greater than the height of one end of the pole protruding from the mounting table relative to the reference surface. The battery cell cover plate can be supported and connected with a box body of a battery pack through the supporting table, the shell of the battery cell itself is used as a supporting force piece, the internal space utilization rate of the battery pack is improved, the structural strength of the cover plate body corresponding to the pole area is increased through the mounting table. The supporting table and the mounting table of the bending structure are beneficial to reducing the material cost of the cover plate body.

Description

Technical Field

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

[0002] The battery pack includes a casing and battery modules assembled inside the casing. Each battery module consists of multiple cells, with the terminals of these cells electrically connected via busbars. The casing provides physical support for the battery modules, protecting them from external impacts and pressure, while also preventing the intrusion of moisture, dust, and other impurities. As users' demands for longer battery life continue to increase, current battery technology faces a contradiction: battery capacity development lags behind market demand, leading to user range anxiety.

[0003] In traditional battery pack structures, to prevent the busbars and terminals from being squeezed when the casing deforms under external impact, a large space is left between the busbars and the battery pack casing. However, this results in low utilization of the internal space of the battery pack, which is not conducive to improving the energy density of the battery pack. Summary of the Invention

[0004] This invention provides a cell cover and a cell to solve the problem of low internal space utilization in battery packs in the prior art.

[0005] This invention provides a battery cell cover plate, comprising: The cover plate body is bent to form a support platform and a mounting platform. One side of the cover plate body has a reference surface. The support platform and the mounting platform protrude from the reference surface and are arranged along the length direction of the cover plate body. The mounting platform is provided with a through hole. The pole post passes through the through hole and protrudes from the mounting platform. In the thickness direction of the cover plate body, the height of the support platform relative to the reference surface is greater than the height of the end of the pole post protruding from the mounting platform relative to the reference surface.

[0006] The battery cell cover plate provided by the present invention further includes: An explosion-proof valve is disposed on the cover plate body, and the explosion-proof valve is located on the side of the support platform away from the mounting platform in the length direction.

[0007] According to the present invention, the cover plate body is provided with a mounting groove, an explosion-proof valve is disposed in the mounting groove, and in the length direction, the support platform is located between the mounting groove and the mounting platform, and the distance between the support platform and the mounting groove is G1, where G1≥5mm.

[0008] The battery cell cover plate provided by the present invention further includes: An insulating component is disposed on the side of the cover plate body away from the reference surface. The pole is inserted through the insulating component, and the side of the insulating component near the cover plate body is configured to conform to the shape of the cover plate body.

[0009] The battery cell cover plate provided by the present invention further includes: The connecting piece is connected to the support platform and the mounting platform to form a stepped boss. The side of the insulating member away from the reference surface forms a stepped groove corresponding to the position of the stepped boss. The connecting piece is located in the stepped groove. One end of the connecting piece in the length direction is connected to the pole post. The other end of the connecting piece in the length direction is opposite to the support platform in the thickness direction and is adapted to be connected to the pole lug of the pole group.

[0010] According to the present invention, the side wall of the support platform and the reference plane are at an angle of 90°+β, the side wall of the mounting platform and the reference plane are at an angle of 90°+β, 15°≤β≤25°, and 15°≤γ≤25°.

[0011] According to the present invention, the height of the mounting platform relative to the reference surface in the thickness direction of the cover body is H1, where 1.0mm≤H1≤2mm; And / or, the height of the support platform relative to the pole in the thickness direction is H2, 1.5mm≤H2≤2.5mm.

[0012] The battery cell cover plate provided by the present invention further includes: The upper plastic is provided with a positioning groove on the top of the mounting platform, and the upper plastic is placed in the positioning groove. The pole is inserted through the upper plastic. The support platform and the mounting platform are connected to form a stepped boss. The distance between the positioning groove and the edge of the mounting platform in the length direction is G2, 3mm≤G2≤6mm, and the distance between the positioning groove and the edge of the mounting platform in the width direction of the cover plate body is G3, 7mm≤G3≤10mm.

[0013] According to the present invention, a battery cell cover plate is provided, wherein the support platform and the mounting platform are connected to form a stepped boss, and the number of the stepped bosses is two, and the two stepped bosses are spaced apart in the length direction; in the length direction, the total length of the cover plate body is L, and the length of the stepped boss is L1, 0.6≤2L1 / L≤0.7.

[0014] The present invention also provides a battery cell, comprising: The battery cell casing has an opening; In any of the above-mentioned cell cover plates, the cell cover plate is disposed in the opening and surrounds the cell housing to form a receiving cavity; An electrode assembly is disposed within the receiving cavity, and the electrode tabs of the electrode assembly are connected to the electrode post.

[0015] The battery cell cover and battery cell provided by this invention, by setting a support platform on the cover body and using the support platform to support and connect with the housing, allows the outer shell of the battery cell itself to also serve as a supporting load-bearing component. This avoids large deformation of the housing, helps reduce the thickness of the housing, and enables a lightweight design of the battery pack. Furthermore, while ensuring that the housing does not cause crush damage to the busbars and terminals, it reduces the distance between the busbars and the housing, thereby increasing the volume of the battery cell, fully utilizing the internal space of the housing, and improving the capacity of the battery cell and the energy density of the entire battery pack. The heat of the battery cell can be transferred to the housing through the support platform, improving the heat dissipation efficiency of the battery cell. By setting a mounting platform on the cover body, the structural strength of the cover body corresponding to the terminal area is increased, reducing the risk of short circuits caused by the deformation of the cover body under impact and the crushing of the terminals. The bent structure of the support platform and mounting platform helps reduce the requirements for material ductility, reducing material costs, and also facilitates obtaining a higher support platform height through a single stamping process. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the battery cell cover plate structure provided by the present invention.

[0018] Figure 2 yes Figure 1 A schematic diagram of the battery cell cover from another perspective.

[0019] Figure 3 yes Figure 1 A top view of the battery cell cover plate.

[0020] Figure 4 yes Figure 3 A partial cross-sectional view of the battery cell cover plate at point AA.

[0021] Figure 5 This is a schematic diagram of the battery cell provided by the present invention.

[0022] Figure 6 This is a schematic diagram of the assembly of the electrode group and the cell cover plate of the battery cell provided by the present invention.

[0023] Figure label: 1. Cover plate body; 10. Reference surface; 11. Stepped boss; 111. Support platform; 112. Mounting platform; 113. Positioning groove; 114. Mounting groove; 2. Pole post; 21. Connecting post; 22. Riveting block; 3. Explosion-proof valve; 4. Insulating component; 41. Protrusion; 42. Stepped recess; 421. First recess; 422. Second recess; 43. Exhaust structure; 5. Connecting piece; 51. Welding part; 52. Base part; 53. Connecting part; 6. Upper plastic; 7. Pole group; 71. Pole tab; 8. Cell housing. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0025] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "first" and "second" are numbered for the purpose of clearly identifying product components and do not represent any substantial difference. The terms "installed," "connected," and "linked" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention according to the specific circumstances. Furthermore, "multiple" means two or more. In the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0026] The following is combined with Figures 1-6 The present invention describes the cell cover plate and the cell.

[0027] like Figure 1 As shown, the battery cell cover plate provided in this embodiment of the invention includes a cover plate body 1 and an electrode post 2. The cover plate body 1 is bent to form a support platform 111 and a mounting platform 112. One side of the cover plate body 1 has a reference surface 10. The support platform 111 and the mounting platform 112 protrude from the reference surface 10 and are arranged along the length direction of the cover plate body 1. The mounting platform 112 is provided with a through hole. The electrode post 2 passes through the through hole and protrudes from the mounting platform 112. In the thickness direction of the cover plate body 1, the height of the support platform 111 relative to the reference surface 10 is greater than the height of the end of the electrode post 2 protruding from the mounting platform 112 relative to the reference surface 10.

[0028] The cell cover is applied to the cell, which includes a cell housing 8, an electrode assembly 7, and the cell cover. The cell housing has an opening, and the cell cover is positioned at the opening and surrounds the cell housing to form a receiving cavity. The electrode assembly 7 is disposed within the receiving cavity. The cell housing 8 and the cover body 1 are welded together to form the outer shell of the cell, providing protection for the internal components and withstanding certain external impacts. A terminal post 2 protrudes from the outer surface of the cover body 1 to form a terminal terminal, used for connection to a busbar, allowing multiple cells to be connected via the busbar to form a battery module. The other end of the terminal post 2 is located within the receiving cavity and connected to the tab 71 of the electrode assembly 7. The battery module is assembled into a housing to form a battery pack.

[0029] For the length and width directions of the cover plate body 1, see [reference]. Figure 1 The thickness direction of the cover plate is perpendicular to the length and width directions and perpendicular to the reference plane 10. Specifically, the cover plate body 1 has a first side and a second side opposite to each other in its thickness direction. The first side faces the outside of the cell and is provided with a support platform 111 and a mounting platform 112. The electrode post 2 protrudes from one end of the mounting platform 112 to form an electrode post terminal. The second side faces the electrode assembly inside the receiving cavity. The support platform 111 and the mounting platform 112 can be formed by stamping.

[0030] The support platform 111 is adapted to be connected to the battery pack housing. When the battery pack is in use, the support platform 111 can be located on the top or side of the battery cells and abut against the housing to withstand the impact force transmitted from the housing. The part of the housing that is supported and connected to the support platform 111 can be the housing shell; or, the housing includes a shell and a cold plate, with the cold plate located between the shell and the battery cells, and the support platform 111 supported and connected to the cold plate. The height of the support platform 111 relative to the reference plane 10 is greater than the height of the end of the terminal post 2 protruding from the mounting platform 112 relative to the reference plane 10, so that a certain space is reserved between the terminal post 2 and the housing for the installation of a busbar.

[0031] In traditional battery pack structures, the battery pack relies solely on the casing to withstand external impacts. However, the casing plate opposite the terminal 2 has a large area, making it prone to deformation if its rigidity is insufficient. To prevent casing deformation from causing compression damage to the busbar and terminal 2, a large space needs to be reserved between the busbar and the casing in the structural design, with supporting foam installed between them. Some designs also incorporate concave and convex structures on the casing plate to enhance rigidity and prevent deformation. However, these measures result in a large gap between the cells and the casing, wasting space. Increasing the casing thickness to increase rigidity would increase the weight of the battery pack, hindering lightweight design. Furthermore, the heat from the cell cover is dissipated only through conduction between the terminal 2 and the busbar, and through its own thermal radiation, resulting in low heat dissipation efficiency and easy heat accumulation.

[0032] To address this, this embodiment includes a support platform 111 on the cover plate body 1. The support platform 111 is connected to the casing for support, allowing the outer shell of the battery cell itself to also serve as a load-bearing component. Under the support of the outer shell, significant deformation of the casing can be avoided, thereby reducing the casing thickness and the weight of the battery pack. Furthermore, while ensuring that the casing does not cause crush damage to the busbars and terminals 2, the distance between the busbars and the casing can be reduced, thereby increasing the volume of the battery cell. This fully utilizes the internal space of the casing, improving the capacity of the battery cell and the energy density of the entire battery pack.

[0033] Furthermore, a mounting platform 112 is provided on the cover plate body 1, through which the pole post 2 passes. The mounting platform 112 strengthens the structure of the area on the cover plate body 1 corresponding to the pole post 2, reducing the risk of short circuit caused by deformation of this area under impact force, which could compress the pole post 2.

[0034] It should be noted that the battery cell has two terminals 2, namely a positive terminal and a negative terminal. In this embodiment of the invention, the number of terminals 2 on the battery cell cover can be one or two. The number of mounting platforms 112 can be determined based on the number of terminals 2, with each terminal 2 corresponding to one mounting platform 112.

[0035] The battery cell cover provided in this embodiment of the invention, by setting a support platform 111 on the cover body 1 and using the support platform 111 to support and connect with the housing, allows the outer shell of the battery cell itself to also serve as a supporting load-bearing component. This avoids large deformation of the housing, helps reduce the thickness of the housing, and achieves a lightweight design for the battery pack. Furthermore, while ensuring that the housing does not cause crush damage to the busbars and terminals 2, it reduces the distance between the busbars and the housing, thereby increasing the volume of the battery cell, fully utilizing the internal space of the housing, and improving the capacity of the battery cell and the energy density of the entire battery pack. The heat from the battery cell can be transferred to the housing through the support platform 111, improving the heat dissipation efficiency of the battery cell. By setting a mounting platform 112 on the cover body 1, the structural strength of the area corresponding to the terminal 2 on the cover body 1 is increased, reducing the risk of short circuits caused by the deformation of the cover body 1 under impact and the crushing of the terminal 2. The bent structure of the support platform 111 and mounting platform 112 helps to reduce the requirements for material ductility, reduce material costs, and also helps to obtain a higher support platform 111 in a single stamping process.

[0036] In some embodiments of the present invention, the support platform 111 and the mounting platform 112 are connected to form a stepped boss 11. It is understood that the height of the support platform 111 relative to the reference surface 10 is greater than the height of the mounting platform 112 relative to the reference surface 10, and the two are connected to form an integral stepped boss 11, which saves the plate surface space of the cover plate body 1.

[0037] It should be noted that, if there is sufficient space on the surface of the cover plate body 1, the support platform 111 and the mounting platform 112 can also be set at intervals.

[0038] like Figure 1 and Figure 3 As shown, the battery cell cover provided in this embodiment of the invention also includes an explosion-proof valve 3. The explosion-proof valve 3 is disposed on the cover body 1. Specifically, the cover body 1 is provided with a vent hole, which communicates with the housing cavity of the battery cell, and the explosion-proof valve 3 is opposite to the vent hole. When the battery cell experiences thermal runaway, the high-temperature gas inside can be discharged from the explosion-proof valve 3.

[0039] The explosion-proof valve 3 is located on the side of the support platform 111 away from the mounting platform 112 along the length of the cover body 1, thus separating the terminal post 2 and the explosion-proof valve 3. The support platform 111 can be used to prevent the high-temperature gas and liquid discharged from the explosion-proof valve 3 from reaching the terminal post 2 and the busbar, achieving thermoelectric isolation and improving the safety performance of the battery pack.

[0040] Optionally, such as Figure 1 and Figure 3 As shown, there are two support platforms 111 and two mounting platforms 112. Along the length of the cover plate body 1, two support platforms 111 are located on both sides of the explosion-proof valve 3, and two mounting platforms 112 are located on both sides of the explosion-proof valve 3. The support platforms 111 are situated between the explosion-proof valve 3 and the mounting platforms 112. Two pole posts 2 are correspondingly inserted into the two mounting platforms 112. A support platform 111 is provided between each pole post 2 and the explosion-proof valve 3, separating the two pole posts 2 from the explosion-proof valve 3.

[0041] Optionally, along the length of the cover plate body 1, two stepped bosses 11 are symmetrically distributed on both sides of the explosion-proof valve 3. The two support platforms 111 of the two stepped bosses 11 separate the pole posts 2 and the explosion-proof valve 3 on the two mounting platforms 112.

[0042] In some embodiments of the present invention, the cover plate body 1 is provided with a mounting groove 114, and the explosion-proof valve 3 is disposed within the mounting groove 114. A vent is disposed within the mounting groove 114, and the explosion-proof valve 3, after being installed in the mounting groove 114, is opposite to the vent. The mounting groove 114 serves to position the explosion-proof valve 3. When the depth of the mounting groove 114 is sufficiently deep, the upper surface of the explosion-proof valve 3 can be lower than the reference surface 10, preventing the explosion-proof valve 3 from being struck during production or handling, thus preventing it from malfunctioning.

[0043] Furthermore, along the length of the cover plate body 1, the support platform 111 is located between the mounting groove 114 and the mounting platform 112, and the distance between the support platform 111 and the mounting groove 114 is G1, where G1 ≥ 5 mm. It can be understood that the support platform 111 is located between the explosion-proof valve 3 and the pole post 2 to achieve thermoelectric isolation.

[0044] When both the support platform 111 and the mounting groove 114 are formed by stamping, if the distance between the support platform 111 and the mounting groove 114 is too small, the mounting groove 114 is prone to deformation. In this embodiment, by setting the distance between the support platform 111 and the mounting groove 114 to G1≥5mm, the stamping yield of the support platform 111 and the mounting groove 114 can be improved, deformation of the mounting groove 114 can be avoided, and the assembly yield of the explosion-proof valve 3 and the cover plate body 1 can be improved.

[0045] In this embodiment of the invention, the cover plate body 1 is bent to form a support platform 111 and a mounting platform 112, such that a first groove is formed on the side of the cover plate body 1 away from the reference surface 10 corresponding to the position of the support platform 111, and a second groove is formed on the side of the cover plate body 1 away from the reference surface 10 corresponding to the position of the mounting platform 112. This embodiment, by forming the first groove on the support platform 111 and the second groove on the mounting platform 112, facilitates the expansion of the internal space of the battery cell, increasing the volume of the electrode assembly 7 inside the battery cell, thereby increasing the capacity of the battery cell.

[0046] When the support platform 111 and the mounting platform 112 are connected to form a stepped boss 11, the first groove and the second groove are connected to form a stepped groove.

[0047] like Figure 2 As shown, some embodiments of the present invention provide a cell cover plate that further includes an insulating member 4. The insulating member 4 is disposed on the side of the cover plate body 1 away from the reference surface 10, and the electrode post 2 passes through the insulating member 4. The insulating member 4 is provided with an exhaust structure 43 opposite to the exhaust port, so that gas inside the cell can be discharged from the explosion-proof valve 3. This exhaust structure 43 may consist of multiple through holes, ensuring normal exhaust of the explosion-proof valve 3 while maintaining the structural strength of the insulating member 4.

[0048] When the cell cover is installed on the cell housing 8, the insulating member 4 is located between the cover body 1 and the electrode group 7, and is used for insulation between the cover body 1 and the electrode group 7. The pole post 2 passes through both the cover body 1 and the insulating member 4. One end of the pole post 2 is located on the side of the insulating member 4 away from the cover body 1, and is used to connect with the pole tab 71 of the electrode group 7.

[0049] In some embodiments of the present invention, the side of the insulating member 4 near the cover plate body 1 is configured to conform to the shape of the cover plate body 1.

[0050] It is understood that the insulating component 4 has a first protrusion 41 corresponding to the position of the first groove and a second protrusion 41 corresponding to the position of the second groove. The first protrusion 41 is located in the first groove, and the second protrusion 41 is located in the second groove. The cooperation between the first protrusion 41 and the first groove, and the cooperation between the second protrusion 41 and the second groove, can realize the assembly and positioning of the cover plate body 1 and the insulating component 4, thereby improving assembly efficiency.

[0051] Furthermore, such as Figure 2 As shown, a first recess 421 is formed on the side of the insulating member 4 away from the cover plate body 1, corresponding to the position of the support platform 111, and / or a second recess 422 is formed on the side of the insulating member 4 away from the cover plate body 1, corresponding to the position of the mounting platform 112. The first recess 421 and the second recess 422 expand the internal space of the battery cell, which is beneficial to increasing the capacity of the battery cell.

[0052] like Figure 1 , Figure 2 and Figure 4 As shown, in some embodiments of the present invention, the support platform 111 and the mounting platform 112 are connected to form a stepped boss 11. A stepped groove 42 is formed on the side of the insulating member 4 away from the reference surface 10, corresponding to the position of the stepped boss 11. This stepped groove 42 can be used to accommodate the tabs 71 of the electrode assembly 7.

[0053] Understandably, a stepped protrusion 41 is formed on the side of the insulating element 4 near the cover plate body 1, and this stepped protrusion 41 is located in the stepped groove of the cover plate body 1. Correspondingly, the first recess 421 and the second recess 422 are connected to form a stepped recess 42.

[0054] In the cell structure, a larger space is defined between the stepped sink 42 and the electrode group 7, which can be used to accommodate the electrode tab 71, so that there is more space inside the cell to set the body of the electrode group 7, increasing the space utilization rate inside the cell housing 8, thereby further increasing the capacity of the cell.

[0055] like Figure 2 and Figure 4 As shown, the battery cell cover provided in this embodiment of the invention also includes a connecting piece 5. The connecting piece 5 is located within the stepped recess 42. One end of the connecting piece 5 in the length direction of the cover body 1 is connected to the electrode post 2, and the other end of the connecting piece 5 in the length direction of the cover body 1 is opposite to the support platform 111 in the thickness direction of the cover body 1 and is adapted to be connected to the electrode tab 71. The fact that the connecting piece 5 is located within the stepped recess 42 can further improve the space utilization rate inside the battery cell housing 8, which is beneficial for increasing the capacity of the battery cell.

[0056] Specifically, the connecting piece 5 includes a welding part 51, a connecting part 53, and a base part 52 that are sequentially connected along the length of the cover plate body 1. The welding part 51 is used to connect with the electrode tab and corresponds to the area of ​​the first groove. The base part 52 is connected with the electrode post 2 and corresponds to the area of ​​the second groove. The welding part 51 is parallel to the base part 52 and is set at an angle to the connecting part 53.

[0057] like Figure 4As shown, in some embodiments of the present invention, the angle between the side wall of the support platform 111 and the reference surface 10 is 90°+β, and the angle between the side wall of the mounting platform 112 and the reference surface 10 is 90°+γ, 15°≤β≤25°, and 15°≤γ≤25°.

[0058] Both the support platform 111 and the mounting platform 112 have a top wall and side walls connected to the top wall. By setting the angles to 15°≤β≤25° and 15°≤γ≤25°, it is beneficial to ensure the manufacturability, structural strength, and uniform stress distribution of the support part 121 and the mounting part 122, thereby improving the production yield. If the included angle is too small, it is not conducive to the stamping process and is prone to causing large stress concentration; if the included angle is too large, the impact resistance is insufficient, and the support platform 111 and the mounting platform 112 occupy a large area, which is not conducive to the distribution of the support platform 111, the mounting platform 112, and the explosion-proof valve 3.

[0059] like Figure 4 As shown, in some embodiments of the present invention, the height of the mounting platform 112 relative to the reference plane 10 in the thickness direction of the cover plate body 1 is H1, where 1.0mm ≤ H1 ≤ 2mm. Specifically, when the mounting platform 112 is formed by stamping, if the value of H1 is too low, the reinforcement effect on the pole post position structure will be poor; if the value of H1 is too high, and the corresponding support platform 111 needs to be even higher, it is not conducive to ensuring the stamping yield of the support platform 111.

[0060] In some embodiments of the present invention, the height of the support platform 111 relative to the terminal post 2 in the thickness direction of the cover plate body 1 is H2, where 1.5mm ≤ H2 ≤ 2.5mm. This height difference allows for the installation of a busbar on the top of the terminal post 2, ensuring that the height of the busbar relative to the reference plane 10 is lower than the height of the support platform 111 relative to the reference plane 10. If the value of H2 is too small, the space between the terminal post 2 and the housing is insufficient to install the busbar; if the value of H2 is too large, it is difficult to guarantee the stamping yield and will result in wasted space, which is not conducive to improving the utilization rate of the internal space of the battery pack.

[0061] like Figure 1 and Figure 3 As shown, the battery cell cover provided in this embodiment of the invention also includes an upper plastic 6. The top of the mounting platform 112 is provided with a positioning groove 113. The upper plastic 6 is disposed in the positioning groove 113, and the electrode post 2 passes through the upper plastic 6.

[0062] Specifically, the through hole on the mounting platform 112 for inserting the pole post 2 is located within the positioning groove 113. The pole post 2 includes a connecting post 21 and a rivet block 22. The connecting post 21 passes through the cover plate body 1 and the upper plastic 6. The rivet block 22 is located on the side of the upper plastic 6 away from the cover plate body 1. The connecting post 21 and the rivet block 22 are riveted together to fix the pole post 2, the upper plastic 6, and the cover plate body 1. The upper plastic 6 is positioned within the positioning groove 113, serving as an insulating barrier between the rivet block 22 and the cover plate body 1. An insulating sealing ring is provided between the connecting post 21 and the cover plate body 1, serving as an insulating seal between them. The connecting piece 5 and the connecting post 21 can be an integral structure or a separate structure.

[0063] Furthermore, such as Figure 3 As shown, the support platform 111 and the mounting platform 112 are connected to form a stepped boss 11. The distance between the positioning groove 113 and the edge of the mounting platform 112 in the length direction of the cover plate body 1 is G2, and the distance between the positioning groove 113 and the edge of the mounting platform 112 in the width direction of the cover plate body 1 is G3. 3mm≤G2≤6mm, 7mm≤G3≤10mm.

[0064] When both the mounting platform 112 and the positioning groove 113 are formed by stamping, if the distance between the positioning groove 113 and the edge of the mounting platform 112 is too small, it will easily affect the stamping yield of the mounting platform 112 and the positioning groove 113, and the support platform 111 will easily interfere with the assembly operation during the assembly of the pole post 2. If the distance between the positioning groove 113 and the edge of the mounting platform 112 is too large, it will reduce the area of ​​the positioning groove 113, which is not conducive to the setting of the pole post 2. This embodiment improves the stamping yield of the positioning groove 113 and the mounting platform 112 by setting 3mm≤G2≤6mm and 7mm≤G3≤10mm, ensures the structural strength of the mounting platform 112, avoids deformation of the positioning groove 113, and improves the assembly yield of the pole post 2 and the cover plate body 1. At the same time, the support platform 111 will not interfere with the operating equipment during the assembly of the pole post 2 and the cover plate body 1.

[0065] In some embodiments of the present invention, the support platform 111 and the mounting platform 112 are connected to form a stepped boss 11. There are two stepped bosses 11, spaced apart along the length of the cover plate body 1. Along the length of the cover plate body 1, the total length of the cover plate body 1 is L, and the length of the stepped boss 11 is L1, where 0.6 ≤ 2L1 / L ​​≤ 0.7. If the value of L1 is too small, the area of ​​the support platform 111 or the mounting platform 112 will be too small, resulting in insufficient support strength of the support platform 111 or affecting the setting of the pole post 2. If the value of L1 is too large, it will affect the size of the explosion-proof valve 3, or cause the distance between the stepped boss 11 and the mounting groove 114 to be too close, affecting the stamping yield of the stepped boss 11 and the mounting groove 114.

[0066] like Figure 5 and Figure 6 As shown, this embodiment of the invention also provides a battery cell, including a battery cell housing 8, an electrode assembly 7, and a battery cell cover plate as described in any of the above embodiments. The battery cell housing 8 has an opening, and the battery cell cover plate is disposed at the opening and surrounds the battery cell housing 8 to form a receiving cavity. The electrode assembly 7 is disposed within the receiving cavity, and the electrode tabs 71 of the electrode assembly 7 are connected to the electrode posts 2.

[0067] When assembling the battery cell, first weld the electrode group 7 and the terminal post 2 of the cell cover plate, and then assemble the cell cover plate onto one end of the electrode group 7. See [link to documentation]. Figure 6 The electrode tabs 71 are retracted into the first recess 421 corresponding to the support platform 111. Then, the electrode assembly 7 is installed into the cell housing 8, and the cover plate body 1 is welded to the cell housing 8. Before being installed into the housing, the outside of the electrode assembly 7 is usually wrapped with an insulating film to provide insulation between the electrode assembly 7 and the cell housing 8.

[0068] The length dimension of the cover plate body is defined as L, and the width dimension is defined as W. Based on the parameter value ranges defined in this embodiment of the invention, a Design of Experiments (DOE) is conducted using cover plate bodies with dimensions of 150mm≤L≤300mm and 25mm≤W≤75mm as the test objects. After the cover plate body is stamped, any stamping abnormalities are detected. During the assembly of the battery cell cover, the assembly of the explosion-proof valve and the terminal post with the cover plate body is checked. After the battery cells are assembled, a Z-axis (thickness direction of the cover plate body) stamping test is performed on the battery pack to detect the surface stress of the cover plate body. The experimental results are shown in Table 1, where H1, H2, L1, L, G1, G2, and G3 are in mm.

[0069] Table 1: Experimental Data

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery cell cover plate, characterized in that, include: The cover plate body is bent to form a support platform and a mounting platform. One side of the cover plate body has a reference surface. The support platform and the mounting platform protrude from the reference surface and are arranged along the length direction of the cover plate body. The mounting platform is provided with a through hole. The pole post passes through the through hole and protrudes from the mounting platform. In the thickness direction of the cover plate body, the height of the support platform relative to the reference surface is greater than the height of the end of the pole post protruding from the mounting platform relative to the reference surface.

2. The cell cover plate according to claim 1, characterized in that, Also includes: An explosion-proof valve is disposed on the cover plate body, and the explosion-proof valve is located on the side of the support platform away from the mounting platform in the length direction.

3. The cell cover plate according to claim 2, characterized in that, The cover plate body is provided with an installation groove, and the explosion-proof valve is installed in the installation groove. In the length direction, the support platform is located between the installation groove and the installation platform. The distance between the support platform and the installation groove is G1, where G1 ≥ 5mm.

4. The cell cover plate according to claim 1, characterized in that, Also includes: An insulating component is disposed on the side of the cover plate body away from the reference surface. The pole is inserted through the insulating component, and the side of the insulating component near the cover plate body is configured to conform to the shape of the cover plate body.

5. The cell cover plate according to claim 4, characterized in that, Also includes: The connecting piece is connected to the support platform and the mounting platform to form a stepped boss. The side of the insulating member away from the reference surface forms a stepped groove corresponding to the position of the stepped boss. The connecting piece is located in the stepped groove. One end of the connecting piece in the length direction is connected to the pole post. The other end of the connecting piece in the length direction is opposite to the support platform in the thickness direction and is adapted to be connected to the pole lug of the pole group.

6. The cell cover plate according to claim 1, characterized in that, The angle between the side wall of the support platform and the reference plane is 90°+β, and the angle between the side wall of the mounting platform and the reference plane is 90°+β, 15°≤β≤25°, 15°≤γ≤25°.

7. The cell cover plate according to claim 1, characterized in that, The height of the mounting platform relative to the reference surface in the thickness direction of the cover plate body is H1, where 1.0mm≤H1≤2mm; And / or, the height of the support platform relative to the pole in the thickness direction is H2, 1.5mm≤H2≤2.5mm.

8. The cell cover plate according to claim 1, characterized in that, Also includes: The upper plastic is provided with a positioning groove on the top of the mounting platform, the upper plastic is placed in the positioning groove, the pole is inserted through the upper plastic, and the support platform and the mounting platform are connected to form a stepped boss. The distance between the positioning groove and the edge of the mounting platform in the length direction is G2, 3mm≤G2≤6mm, and the distance between the positioning groove and the edge of the mounting platform in the width direction of the cover plate body is G3, 7mm≤G3≤10mm.

9. The cell cover plate according to claim 1, characterized in that, The support platform and the mounting platform are connected to form a stepped boss. There are two stepped bosses, which are spaced apart in the length direction. In the length direction, the total length of the cover plate body is L, and the length of the stepped boss is L1, where 0.6≤2L1 / L≤0.

7.

10. A battery cell, characterized in that, include: The battery cell casing has an opening; The cell cover plate as described in any one of claims 1 to 9, wherein the cell cover plate is disposed at the opening and surrounds the cell housing to form a receiving cavity; An electrode assembly is disposed within the receiving cavity, and the electrode tabs of the electrode assembly are connected to the electrode post.

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