Battery cell cover plate assembly, battery cell, and battery pack

Abstract

The utility model relates to battery technical field discloses the electric core cover plate subassembly, electric core and battery package, wherein the electric core cover plate subassembly, mainly includes: cover plate, pole, riveting block and insulating part, cover plate is equipped with mounting hole, the pole is inserted in the mounting hole and the top extends the upper surface of cover plate, riveting block is connected with the top of pole, the insulating part is set up in the pole outside and is clamped between cover plate and riveting block, the upper and lower two sides of insulating part are equipped with at least two clamping portions respectively, at least two clamping portions distribute in the opposite sides of pole, the lower surface of riveting block and the upper surface of cover plate are all set up clamping groove corresponding clamping portion, and riveting block, cover plate are connected with insulating part through clamping in clamping groove and clamping portion. The utility model discloses riveting block and the both ends of cover plate are connected and fixed with insulating part through clamping in clamping groove and clamping portion, can avoid riveting block and the insulating part because of being too long and both ends are raised, is favorable for promoting the welding quality and the resistance value stability between riveting block and cover plate.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a cell cover assembly, a cell, and a battery pack. Background Technology

[0002] In existing battery structures, the cell casing is generally fixedly connected to the cover plate assembly to form a sealed space for accommodating the electrode assembly. The single-pole riveted cover plate assembly is a common type of cover plate assembly for battery cells. With the increasing demand for fast charging in the market, the welding current-passing area of ​​the riveting block is also constantly expanding, resulting in the length of the riveting block becoming larger and larger.

[0003] For longer riveting blocks, due to the single-pole riveting process, the cover plate assembly inevitably experiences warping at both ends of the riveting block and the insulating component. Warping of the riveting block causes poor flatness defects, which will affect the welding quality during the subsequent battery assembly stage. In addition, since the insulating component has a corresponding resistance value to maintain the voltage stability of the battery cell, if the insulating component warps, it will cause a decrease in the fit between the insulating component and the cover plate, resulting in poor resistance stability between the riveting block and the cover plate, which is prone to large resistance fluctuations and affects voltage stability. Utility Model Content

[0004] In view of this, the present invention provides a cell cover plate assembly, a cell, and a battery pack to solve the problems that the ends of the long riveting blocks and insulating parts are prone to warping due to the riveting process, resulting in poor welding quality and poor resistance stability between the riveting blocks and the cover plate.

[0005] In a first aspect, this utility model provides a battery cell cover assembly, comprising: The cover plate has a through mounting hole along the Z direction; The pole post is inserted into the mounting hole along the Z direction and extends out of the upper surface of the cover plate; A riveting block is connected to the top of the pole post; An insulating component is sleeved outside the pole post and sandwiched between the cover plate and the riveting block; Along the Z direction, the upper and lower surfaces of the insulating component are provided with at least two snap-fit ​​portions, and the at least two snap-fit ​​portions are distributed along the X direction on opposite sides of the pole post. The lower surface of the rivet block and the upper surface of the cover plate are respectively provided with snap-fit ​​grooves corresponding to the snap-fit ​​portions. The rivet block and the cover plate are snapped into the snap-fit ​​grooves through the snap-fit ​​portions and connected to the insulating component.

[0006] Beneficial effects: The battery cell cover assembly of this utility model has at least two snap-fit ​​parts on the upper and lower surfaces of the insulating component, and snap-fit ​​grooves on the lower surface of the rivet block and the upper surface of the cover plate, respectively. The snap-fit ​​parts are located on opposite sides of the electrode post along the X direction, so that the rivet block and the cover plate are snap-fitted and fixed to the insulating component, and the connection is firm. Therefore, it can avoid the problem of the rivet block and the insulating component warping at both ends due to excessive length, reduce the risk of poor flatness of the rivet block, thereby improving the welding quality in the battery assembly stage. Moreover, it can also ensure the resistance stability between the rivet block and the cover plate, thereby ensuring voltage stability.

[0007] In one optional embodiment, the snap-fit ​​groove includes a first snap-fit ​​groove located on the lower surface of the rivet block and a second snap-fit ​​groove located on the upper surface of the cover plate. Along the X direction, the distance between the groove wall of the first snap-fit ​​groove and the side wall of the adjacent rivet block is L1, which satisfies 0.5 mm ≤ L1 ≤ 5 mm.

[0008] Beneficial effects: By controlling L1 within a suitable range, it can be ensured that the first locking groove and the first locking part fix both ends of the rivet block, while also ensuring that the rivet block still has sufficient structural strength after the first locking groove is opened. If the value of L1 is too small, the first locking groove is too close to the side wall of the rivet block, and the part between the side wall of the rivet block and the first locking groove is too narrow, which easily leads to stress concentration and reduces the strength of the rivet block. If the value of L1 is too large, the first locking groove is too far from the side wall of the rivet block, and there is still a risk of warping at both ends of the rivet block in the length direction, resulting in poor flatness of the rivet block.

[0009] In one optional embodiment, the groove depth of the first snap-fit ​​groove is H1, and the thickness of the rivet block is H2, satisfying 1 / 3≤H1 / H2≤2 / 3.

[0010] Beneficial effect: By controlling H1 / H2 within a suitable range, it can be ensured that the riveting block has sufficient thickness after the first snap-fit ​​groove is opened, so as to ensure the structural strength of the riveting block.

[0011] In one alternative implementation, the projection of the first snap-fit ​​slot in the XY plane partially overlaps with the projection of the adjacent second snap-fit ​​slot in the XY plane.

[0012] Beneficial effects: Since the first snap-fit ​​groove is located near the end of the rivet block along its length, and the projection of the first snap-fit ​​groove in the XY plane partially overlaps with the projection of the adjacent second snap-fit ​​groove in the XY plane, the second snap-fit ​​groove is located near the end of the insulating component along its length, thereby reducing the risk of the insulating component's ends warping.

[0013] In one optional embodiment, the snap-fit ​​portion includes a connecting segment and a snap-fit ​​segment connected to each other. The connecting segment extends along the Z direction, and the snap-fit ​​segment extends along the X direction. The width of the connecting segment along the X direction is W1, and the width of the snap-fit ​​segment along the X direction is W2, satisfying W2 > W1, 0.5 mm ≤ W1 ≤ 1 mm, and 0.6 mm ≤ W2 ≤ 1.5 mm.

[0014] Beneficial effects: The width of the snap-fit ​​segment is greater than the width of the connecting segment, forming a snap-fit ​​step between the snap-fit ​​segment and the connecting segment. The connecting segment connects the insulating component and the snap-fit ​​segment. The snap-fit ​​segment is inserted into the snap-fit ​​groove and interlocks with the groove to form a snap-fit ​​structure, ensuring a firm connection. By controlling W1 and W2 within a suitable range, the structural strength of the insulating component can be guaranteed. If W1 and W2 are too small, the structural strength of the snap-fit ​​part will be too low, and it will be difficult to injection mold the snap-fit ​​part.

[0015] In one optional embodiment, along the X direction, an assembly gap L2 is left between the groove wall of the snap-fit ​​groove and the side wall of the snap-fit ​​part, satisfying 0.02 mm ≤ L2 ≤ 0.1 mm.

[0016] Beneficial effect: By leaving an assembly gap between the groove wall of the snap-fit ​​slot and the side wall of the snap-fit ​​part, it is easy to insert the snap-fit ​​part into the snap-fit ​​slot, which facilitates assembly.

[0017] In one optional embodiment, the latching portion includes a first latching portion located on the upper surface of the insulating member and a second latching portion located on the lower surface of the insulating member. Along the X direction, the first latching portion and the second latching portion are disposed facing each other, and the second latching portion is located on the side of the first latching portion closer to the pole post.

[0018] Beneficial effects: By setting the first and second locking parts facing each other, the forces from opposite directions in the X direction can be resisted, avoiding stress concentration that could damage the locking parts, thereby further improving the locking stability between the rivet block, the insulating part, and the cover plate.

[0019] In one optional embodiment, the length of the snap-fit ​​portion along the Y direction is L3, and the width of the insulating member along the Y direction is L4, satisfying 0.4≤L3 / L4≤1.

[0020] Beneficial effects: By controlling L3 / L4 within a suitable range, sufficient engagement area can be ensured at the snap-fit ​​joint, thereby guaranteeing the engagement stability of the insulating component and the rivet block at both ends along their length and preventing the ends of the insulating component and the rivet block from lifting up. If the value of L3 / L4 is too small, the engagement range of the snap-fit ​​joint is small, and the insulating component and the rivet block still have the risk of lifting up.

[0021] Secondly, this utility model also provides a battery cell, comprising: The housing has an opening at at least one end; The aforementioned cell cover assembly has the cover plate placed over the opening and connected to the housing.

[0022] Beneficial effects: The battery cell of this utility model has at least two snap-fit ​​parts on the upper and lower surfaces of the insulating component, and snap-fit ​​grooves on the lower surface of the rivet block and the upper surface of the cover plate, respectively. The snap-fit ​​parts are located on opposite sides of the electrode post along the X direction, so that the rivet block and the cover plate are snap-fitted and fixed to the insulating component, and the connection is firm. Therefore, it can avoid the problem of the rivet block and the insulating component warping at both ends due to excessive length, reduce the risk of poor flatness of the rivet block, thereby improving the welding quality in the battery assembly stage, and can also ensure the resistance stability between the rivet block and the cover plate, thereby ensuring voltage stability.

[0023] Thirdly, the present invention also provides a battery pack, comprising: at least one of the above-mentioned battery cells.

[0024] Beneficial effects: Since the battery pack includes the cells, it has the same effects as the cells, which will not be elaborated here. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of a battery cell cover assembly according to an embodiment of the present utility model; Figure 2 This is an exploded view of a battery cell cover assembly according to an embodiment of the present utility model; Figure 3 This is a top view of a battery cell cover assembly according to an embodiment of the present utility model; Figure 4 for Figure 3 Sectional view at point AA; Figure 5 for Figure 4 A magnified view of section B in the diagram; Figure 6 This is a schematic diagram of the structure of a riveting block for a battery cell cover assembly according to an embodiment of the present utility model; Figure 7 This is a structural schematic diagram of the riveting block of a battery cell cover assembly according to another embodiment of the present utility model. Figure 8This is a schematic diagram of the structure of an insulating component of a battery cell cover assembly according to an embodiment of the present utility model; Figure 9 This is a schematic diagram of the insulation component of a battery cell cover assembly according to another embodiment of the present utility model. Figure 10 This is a schematic diagram of the structure of a cover plate of a battery cell cover plate assembly according to an embodiment of the present utility model; Figure 11 This is a structural schematic diagram of the cover plate of a battery cell cover plate assembly according to another embodiment of the present utility model.

[0027] Explanation of reference numerals in the attached figures: 1. Cover plate; 101. Mounting hole; 2. Pole post; 3. Riveting block; 4. Insulating component; 5. Snap-fit ​​part; 501. Connecting section; 502. Snap-fit ​​section; 503. First snap-fit ​​part; 504. Second snap-fit ​​part; 6. Snap-fit ​​groove; 601. First snap-fit ​​groove; 602. Second snap-fit ​​groove. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] In this embodiment of the invention, a "cell" is the smallest unit that makes up a battery, and it can independently perform the functions of charging and discharging. A cell can be cylindrical, cuboid, or other shapes, and this embodiment of the invention is not limited in this respect.

[0030] In some embodiments, the battery cell can be a battery module. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel, or in a mixed manner through a busbar component to form a battery module.

[0031] In the utility model embodiment, the battery cell can be a secondary battery, which refers to a battery cell that can be used again after the battery has been discharged because the active materials can be activated by charging.

[0032] In this embodiment of the invention, the battery cell can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and this embodiment of the invention is not limited to these.

[0033] A battery cell typically consists of an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and an insulating component. During charging and discharging, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The insulating component, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0034] In some embodiments, the electrode assembly further includes tabs that are electrically connected to posts on the cover plate via electrical connectors to conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0035] The battery cell also includes a housing and a cover plate assembly, which are welded together to form a sealed space for accommodating the electrode assembly. In blade batteries, the cover plate assembly typically uses a single-pole riveted cover plate, that is, the various components on the cover plate assembly are fixed into a whole using a riveting process.

[0036] The inventors of this application discovered that if the rivet block and the upper plastic (insulating part) are designed to be too long, the riveting process will inevitably cause the ends of the rivet block and the upper plastic to lift up. If the rivet block lifts up, it will affect the subsequent welding quality. If the upper plastic lifts up, the resistance stability between the rivet block and the cover plate will be poor.

[0037] The following is combined Figures 1 to 11 The following describes embodiments of the present invention.

[0038] According to embodiments of the present invention, on the one hand, such as Figure 1 and Figure 2 As shown, a battery cell cover assembly is provided, mainly including: a cover plate 1, a terminal post 2, a riveting block 3, and an insulating component 4. The cover plate 1 has a through mounting hole 101 along the Z direction. The terminal post 2 is inserted into the mounting hole 101 along the Z direction, with its top extending beyond the upper surface of the cover plate 1. The riveting block 3 is connected to the top of the terminal post 2. The insulating component 4 is sleeved on the outside of the terminal post 2 and sandwiched between the cover plate 1 and the riveting block 3.

[0039] Along the Z direction, the upper and lower surfaces of the insulating component 4 are provided with at least two snap-fit ​​parts 5, and the at least two snap-fit ​​parts 5 are distributed along the X direction on opposite sides of the pole post 2. The lower surface of the rivet block 3 and the upper surface of the cover plate 1 are respectively provided with snap-fit ​​grooves 6 corresponding to the snap-fit ​​parts 5. The rivet block 3 and the cover plate 1 are snapped into the snap-fit ​​grooves 6 through the snap-fit ​​parts 5 and connected to the insulating component 4.

[0040] As can be seen, the battery cell cover assembly provided in this embodiment of the present invention has at least two snap-fit ​​parts 5 on the upper and lower surfaces of the insulating member 4, and snap-fit ​​grooves 6 on the lower surface of the rivet block 3 and the upper surface of the cover plate 1, respectively. The snap-fit ​​parts 5 are located on opposite sides of the pole post 2 along the X direction, so that the rivet block 3 and the cover plate 1 are snap-fitted and fixed to the insulating member 4, and the connection is firm. Therefore, it can avoid the problem of the rivet block 3 and the insulating member 4 warping at both ends due to being too long, reduce the risk of poor flatness of the rivet block 3, thereby improving the welding quality in the battery assembly stage, and can also ensure the resistance stability between the rivet block 3 and the cover plate 1, thereby ensuring voltage stability.

[0041] Specifically, in the Z direction, such as Figure 1 and Figure 2 As shown by arrow Z in the diagram, the X direction is as follows: Figure 1 and Figure 2 As shown by arrow X in the diagram. The upper surface of the insulating component 4 is also provided with a receiving groove for accommodating the rivet block 3. The insulating component 4 is provided with a through hole along the Z direction. The top of the pole post 2 passes through the through hole and is riveted and fixed to the rivet block 3.

[0042] It should be noted that the number of snap-fit ​​parts 5 on the upper or lower surface of the insulating component 4 can be selected as needed, with two, three, or more, and the snap-fit ​​slots and snap-fit ​​parts are arranged in a one-to-one correspondence. For example, as Figure 4 As shown, two snap-fit ​​parts 5 are provided on the upper surface of the insulating member 4, and two snap-fit ​​parts 5 are also provided on the lower surface of the insulating member 4.

[0043] In one embodiment, such as Figure 4 , Figure 5 , Figure 7 and Figure 10 As shown, the snap-fit ​​groove 6 includes a first snap-fit ​​groove 601 located on the lower surface of the rivet block 3 and a second snap-fit ​​groove 602 located on the upper surface of the cover plate 1. Along the X direction, the distance between the groove wall of the first snap-fit ​​groove 601 and the side wall of the adjacent rivet block 3 is L1, which satisfies 0.5 mm ≤ L1 ≤ 5 mm.

[0044] By controlling L1 within a suitable range, it can be ensured that the first locking groove 601 and the first locking part 503 fix both ends of the rivet block 3, while also ensuring that the rivet block 3 still has sufficient structural strength after the first locking groove 601 is opened. If the value of L1 is too small, the first locking groove 601 will be too close to the side wall of the rivet block 3, and the part between the side wall of the rivet block 3 and the first locking groove 601 will be too narrow, which will easily lead to stress concentration and reduce the strength of the rivet block 3. If the value of L1 is too large, the first locking groove 601 will be too far from the side wall of the rivet block 3, and there will still be a risk of warping at both ends of the rivet block 3 in the length direction, resulting in poor flatness of the rivet block 3.

[0045] For example, in this embodiment of the present invention, the value of L1 can be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc.

[0046] Furthermore, in one embodiment, such as Figure 5 As shown, the groove depth of the first locking groove 601 is H1, and the thickness of the riveting block 3 is H2, satisfying 1 / 3 ≤ H1 / H2 ≤ 2 / 3. By controlling H1 / H2 within a suitable range, it can be ensured that the riveting block 3 has sufficient thickness after the first locking groove 601 is opened, so as to ensure the structural strength of the riveting block 3.

[0047] For example, in this embodiment of the invention, the value of H1 / H2 can be 1 / 3, 1 / 2, 2 / 3, etc.

[0048] In one embodiment, the projection of the first snap-fit ​​groove 601 onto the XY plane partially overlaps with the projection of the adjacent second snap-fit ​​groove 602 onto the XY plane. Since the first snap-fit ​​groove 601 is located near the end of the rivet block 3 along its length, and the projection of the first snap-fit ​​groove 601 onto the XY plane partially overlaps with the projection of the adjacent second snap-fit ​​groove 602 onto the XY plane, the second snap-fit ​​groove 602 is positioned near the end of the insulating member 4 along its length, thereby reducing the risk of warping at both ends of the insulating member 4.

[0049] Specifically, in the Y direction, such as Figures 1 to 3 As indicated by arrow Y, the XY plane is the plane formed by the X and Y directions.

[0050] It should be noted that the present invention does not limit the snap-fit ​​structure between the snap-fit ​​part 5 and the snap-fit ​​groove 6, as long as the snap-fit ​​part 5 and the snap-fit ​​groove 6 can be snap-fitted and fixed.

[0051] In this embodiment of the invention, the insulating component 4 is generally made of materials such as PP (polypropylene) or PPS (polyphenylene sulfide) through injection molding. Only the existing injection mold needs to be adjusted to form the snap-fit ​​portion 5 on the insulating component 4, making the manufacturing process simple. The insulating component 4 also has a certain degree of elasticity; therefore, the snap-fit ​​portion 5 and the snap-fit ​​groove 6 can be engaged through an interference fit. Furthermore, the riveting block 3 and the cover plate 1 are typically made of aluminum blocks, and the snap-fit ​​groove 6 can be formed through machining.

[0052] Compared to the structure of setting the snap-fit ​​groove 6 on the insulating component 4 and setting the snap-fit ​​part 5 on the riveting block 3 and the cover plate 1, the present invention can ensure that the insulating component 4 has sufficient strength and guarantee the insulation effect, while also facilitating the processing and manufacturing of the snap-fit ​​part 5 and the snap-fit ​​groove 6.

[0053] In one embodiment, such as Figure 5As shown, the snap-fit ​​part 5 includes a connecting section 501 and a snap-fit ​​section 502 connected to each other. The connecting section 501 extends along the Z direction, and the snap-fit ​​section 502 extends along the X direction. The width of the connecting section 501 along the X direction is W1, and the width of the snap-fit ​​section 502 along the X direction is W2, satisfying W2>W1, 0.5 mm≤W1≤1 mm, and 0.6 mm≤W2≤1.5 mm.

[0054] The width of the snap-fit ​​segment 502 is greater than the width of the connecting segment 501, forming a snap-fit ​​step between the snap-fit ​​segment 502 and the connecting segment 501. The connecting segment 501 is used to connect the insulating component 4 and the snap-fit ​​segment 502. The snap-fit ​​segment 502 is inserted into the snap-fit ​​groove 6 and interlocks with the snap-fit ​​groove 6 to form a snap-fit ​​structure, ensuring a firm connection. By controlling W1 and W2 within a suitable range, the structural strength of the insulating component 4 can be guaranteed. If W1 and W2 are too small, the structural strength of the snap-fit ​​part 5 will be too low, and it will be difficult to injection mold the snap-fit ​​part 5.

[0055] Specifically, the snap-fit ​​segment 502 and the connecting segment 501 form an L-shaped barbed snap, and there is a first stepped surface between them. Correspondingly, the snap-fit ​​groove 6 includes a first sub-groove and a second sub-groove that are connected. In the XY plane, the cross-sectional area of ​​the first sub-groove is smaller than that of the second sub-groove. The second sub-groove is located inside, and the first sub-groove is located outside and has an opening. There is a second stepped surface between the first sub-groove and the second sub-groove. The cross-sectional area of ​​the snap-fit ​​segment 502 is larger than the opening area of ​​the first sub-groove. Under the action of elasticity, the snap-fit ​​segment 502 can pass through the first sub-groove and then enter the second sub-groove. By utilizing the cooperation of the first stepped surface and the second stepped surface, the snap-fit ​​part 5 is snapped into the snap-fit ​​groove 6, forming a snap-fit ​​fixing structure.

[0056] For example, in this embodiment of the present invention, the value of W1 can be 0.5 mm, the value of W2 can be 0.6 mm, or the value of W1 can be 0.7 mm, the value of W2 can be 1 mm; or the value of W1 can be 1 mm, the value of W2 can be 1.5 mm, etc.

[0057] In other embodiments, the snap-fit ​​segment 502 and the connecting segment 501 can also form a T-shaped barbed snap. The specific setting can be selected according to actual needs. In this regard, the present invention does not impose too many restrictions.

[0058] In one embodiment, such as Figure 5 As shown, along the X direction, an assembly gap L2 is left between the groove wall of the snap-fit ​​groove 6 and the side wall of the snap-fit ​​part 5, satisfying 0.02 mm ≤ L2 ≤ 0.1 mm. By leaving an assembly gap between the groove wall of the snap-fit ​​groove 6 and the side wall of the snap-fit ​​part 5, it is easy for the snap-fit ​​part 5 to be inserted into the snap-fit ​​groove 6, facilitating assembly.

[0059] For example, in this embodiment of the present invention, the value of L2 can be 0.02 mm, 0.04 mm, 0.06 mm, 0.08 mm, 0.1 mm, etc.

[0060] In one embodiment, such as Figure 4 , Figure 8 and Figure 9 As shown, the locking portion 5 includes a first locking portion 503 located on the upper surface of the insulating member 4 and a second locking portion 504 located on the lower surface of the insulating member 4. Along the X direction, the first locking portion 503 and the second locking portion 504 are arranged facing each other, with the second locking portion 504 located on the side of the first locking portion 503 closer to the pole post 2. Arranging the first locking portion 503 and the second locking portion 504 facing each other can resist opposing forces from the X direction, preventing stress concentration that could damage the locking portion 5, thereby further improving the locking stability between the riveting block 3, the insulating member 4, and the cover plate 1.

[0061] In some other embodiments, the first latching portion 503 and the second latching portion 504 may be arranged opposite to each other along the X direction.

[0062] In one embodiment, such as Figure 9 As shown, the length of the snap-fit ​​part 5 along the Y direction is L3, and the width of the insulating part 4 along the Y direction is L4, satisfying 0.4≤L3 / L4≤1. By controlling L3 / L4 within a suitable range, it can be ensured that the snap-fit ​​part 5 has sufficient engagement area, thereby ensuring the engagement stability of the insulating part 4 and the riveting block 3 at both ends along the length direction and preventing the ends of the insulating part 4 and the riveting block 3 from lifting up. If the value of L3 / L4 is too small, the engagement range of the snap-fit ​​part 5 is small, and the insulating part 4 and the riveting block 3 still have the risk of lifting up.

[0063] For example, in this embodiment of the invention, the value of L3 / L4 can be 0.4, 0.6, 0.8, 1, etc.

[0064] According to an embodiment of the present invention, another aspect provides a battery cell, mainly comprising: a housing and a battery cell cover assembly, wherein the housing has an opening at at least one end. A cover plate 1 of the battery cell cover assembly is disposed over the opening and connected to the housing.

[0065] The battery cell provided in this embodiment of the utility model has at least two snap-fit ​​parts 5 on the upper and lower surfaces of the insulating component 4, and snap-fit ​​grooves 6 on the lower surface of the rivet block 3 and the upper surface of the cover plate 1, respectively. The snap-fit ​​parts 5 are located on opposite sides of the pole post 2 along the X direction, so that the rivet block 3 and the cover plate 1 are snap-fitted and fixed to the insulating component 4, and the connection is firm. Therefore, it can avoid the problem of the rivet block 3 and the insulating component 4 warping at both ends due to excessive length, reduce the risk of poor flatness of the rivet block 3, thereby improving the welding quality in the battery assembly stage, and can also ensure the resistance stability between the rivet block 3 and the cover plate 1, thereby ensuring voltage stability.

[0066] According to an embodiment of the present invention, in another aspect, a battery pack is also provided, comprising: at least one of the above-described battery cells.

[0067] Since the battery pack includes battery cells and has the same effect as the battery cells, it will not be elaborated on here.

[0068] In this embodiment of the invention, the battery pack may further include a housing, in which the battery cells are housed.

[0069] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0070] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A cell cover assembly, characterized in that, include: The cover plate has a through mounting hole along the Z direction; The pole post is inserted into the mounting hole along the Z direction and extends out of the upper surface of the cover plate; A riveting block is connected to the top of the pole post; An insulating component is sleeved outside the pole post and sandwiched between the cover plate and the riveting block; Along the Z direction, the upper and lower surfaces of the insulating component are provided with at least two snap-fit ​​portions, and the at least two snap-fit ​​portions are distributed along the X direction on opposite sides of the pole post. The lower surface of the rivet block and the upper surface of the cover plate are respectively provided with snap-fit ​​grooves corresponding to the snap-fit ​​portions. The rivet block and the cover plate are snapped into the snap-fit ​​grooves through the snap-fit ​​portions and connected to the insulating component.

2. The cell cover assembly according to claim 1, characterized in that, The snap-fit ​​groove includes a first snap-fit ​​groove located on the lower surface of the rivet block and a second snap-fit ​​groove located on the upper surface of the cover plate. Along the X direction, the distance between the groove wall of the first snap-fit ​​groove and the side wall of the adjacent rivet block is L1, which satisfies 0.5 mm ≤ L1 ≤ 5 mm.

3. The cell cover assembly according to claim 2, characterized in that, The groove depth of the first snap-fit ​​groove is H1, and the thickness of the rivet block is H2, satisfying 1 / 3≤H1 / H2≤2 / 3.

4. The cell cover assembly according to claim 2, characterized in that, The projection of the first card slot in the XY plane partially overlaps with the projection of the adjacent second card slot in the XY plane.

5. The cell cover assembly according to any one of claims 2 to 4, characterized in that, The snap-fit ​​part includes a connecting section and a snap-fit ​​section connected to each other. The connecting section extends along the Z direction, and the snap-fit ​​section extends along the X direction. The width of the connecting section along the X direction is W1, and the width of the snap-fit ​​section along the X direction is W2, satisfying W2>W1, 0.5 mm≤W1≤1 mm, and 0.6 mm≤W2≤1.5 mm.

6. The cell cover assembly according to claim 5, characterized in that, Along the X direction, there is an assembly gap L2 between the groove wall of the snap-fit ​​groove and the side wall of the snap-fit ​​part, which satisfies 0.02 mm ≤ L2 ≤ 0.1 mm.

7. The cell cover assembly according to claim 5, characterized in that, The latching portion includes a first latching portion located on the upper surface of the insulating member and a second latching portion located on the lower surface of the insulating member. Along the X direction, the first latching portion and the second latching portion are arranged facing each other, and the second latching portion is located on the side of the first latching portion closer to the pole post.

8. The cell cover assembly according to any one of claims 2 to 4, characterized in that, The length of the snap-fit ​​part along the Y direction is L3, and the width of the insulating part along the Y direction is L4, satisfying 0.4≤L3 / L4≤1.

9. A battery cell, characterized in that, include: The housing has an opening at at least one end; The cell cover assembly according to any one of claims 1 to 8, wherein the cover is disposed over the opening and connected to the housing.

10. A battery pack, characterized in that, include: At least one battery cell as described in claim 9.

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