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

Abstract

The utility model relates to battery technology field discloses the electric core cover plate subassembly, electric core and battery package, wherein the electric core cover plate subassembly, include: 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, and the opposite two ends of insulating part are respectively equipped with first clamping groove, and the upper surface of cover plate is equipped with with first clamping groove one to one corresponding first clamping part, the utility model discloses the two ends of insulating part are fixed with cover plate through clamping structure and clamping respectively, can avoid riveting block and the insulating part because of too long and two ends are raised, benefit the welding quality and the resistance value stability between riveting block and cover plate are improved.

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 and sandwiched between the cover plate and the riveting block. The insulating component has first snap-fit ​​grooves at opposite ends along the X direction. The upper surface of the cover plate has first snap-fit ​​parts that correspond one-to-one with the first snap-fit ​​grooves. The cover plate is snapped into the first snap-fit ​​grooves through the first snap-fit ​​parts and connected to the insulating component.

[0006] Beneficial effects: The battery cell cover assembly of this utility model has first snap-fit ​​grooves at both ends of the insulation component along its length, and first snap-fit ​​parts corresponding to the first snap-fit ​​grooves are provided on the upper surface of the cover plate, so that the cover plate and the insulation component are snap-fitted and fixed, and the connection is firm. This can avoid the situation where the ends of the rivet block and the insulation component are warped due to excessive length, reduce the risk of poor flatness of the rivet block, thereby improving the welding quality in the battery cell assembly stage, and also ensure the resistance stability between the rivet block and the cover plate, thereby ensuring voltage stability.

[0007] In one optional embodiment, along the Z direction, the upper surface of the insulating member is further provided with at least two second snap-fit ​​portions, and the at least two second snap-fit ​​portions are distributed along the X direction on opposite sides of the pole post. The lower surface of the riveting block is provided with second snap-fit ​​grooves corresponding one-to-one with the second snap-fit ​​portions. The riveting block is snapped into the second snap-fit ​​grooves through the second snap-fit ​​portions and snapped into the insulating member.

[0008] Beneficial effects: By providing at least two second snap-fit ​​parts on the upper surface of the insulating component and providing second snap-fit ​​grooves on the lower surface of the riveting block that correspond one-to-one with the second snap-fit ​​parts, the riveting block and the insulating component are snap-fitted and fixed, thereby improving the connection stability of the riveting block, further improving the welding quality during the cell assembly stage, and ensuring the resistance stability between the riveting block and the cover plate, thus ensuring voltage stability.

[0009] In one optional embodiment, the first snap-fit ​​portion includes a first connecting segment and a first snap-fit ​​segment connected to each other. The first connecting segment extends along the Z direction, and the first snap-fit ​​segment is bent relative to the first connecting segment and extends along the X direction and is inserted into the first snap-fit ​​groove, and the first snap-fit ​​segment abuts against the groove wall of the first snap-fit ​​groove.

[0010] Beneficial effects: Before bending, both the first connecting section and the first snap-fit ​​section extend along the Z-direction and form a vertical limiting element, which can provide limiting for the assembly of the insulating component. After bending, the first snap-fit ​​section can clamp the insulating component between the first snap-fit ​​section and the cover plate, resulting in a firm connection, convenient assembly, and high structural strength.

[0011] In one optional embodiment, the length of the first snap-fit ​​segment along the X direction is L1, satisfying 0.3 mm ≤ L1 ≤ 1 mm.

[0012] Beneficial effects: By controlling L1 within a suitable range, it is possible to ensure that the first clamping segment has sufficient clamping width, guaranteeing the clamping effect on the insulating component after the first clamping segment is bent, and preventing the ends of the insulating component from warping along its length. If the value of L1 is too small, the first clamping segment will be too short, making it difficult to clamp the insulating component, and the ends of the insulating component along its length will easily warp. If the value of L1 is too large, the first clamping segment will be too long, easily causing material waste.

[0013] In one optional embodiment, the width of the first snap-fit ​​groove along the Z direction is T1, satisfying T1 > L1, 1 mm ≤ T1 ≤ 2.5 mm.

[0014] Beneficial effect: By controlling T1 within a suitable range, sufficient bending space can be provided for the first card segment, avoiding interference between the first card segment and the first card slot.

[0015] In one optional embodiment, the groove depth of the first snap-fit ​​groove along the X direction is T2, satisfying T2>L1, 0.5mm≤T2≤1.5 mm.

[0016] Beneficial effects: By controlling T2 within a suitable range, sufficient bending space can be provided for the first snap-fit ​​segment, and the first snap-fit ​​segment can be ensured to press the insulating component tightly.

[0017] In one optional embodiment, the length of the first snap-fit ​​groove along the Y direction is L2, and the width of the insulating member along the Y direction is W1, satisfying that 0.4≤L2 / W1≤1.

[0018] Beneficial effects: By controlling L2 / W1 within a suitable range, sufficient engagement area can be ensured between the first snap-fit ​​part and the first snap-fit ​​groove, thereby guaranteeing the engagement stability between the two ends of the insulating component and the cover plate along its length and preventing the ends of the insulating component from lifting. If the value of L2 / W1 is too small, the engagement range is small, and the insulating component still faces the risk of lifting.

[0019] In one optional embodiment, the second snap-fit ​​portion includes a second connecting segment and a second snap-fit ​​segment connected together. The second connecting segment extends along the Z direction, and the second snap-fit ​​segment extends along the X direction. The width of the second connecting segment along the X direction is W2, and the width of the second snap-fit ​​segment along the X direction is W3, satisfying W3 > W2, 0.5 mm ≤ W2 ≤ 1 mm, and 0.6 mm ≤ W3 ≤ 1.5 mm.

[0020] Beneficial effects: The width of the second snap-fit ​​segment is greater than the width of the second connecting segment, forming a snap-fit ​​step between the second snap-fit ​​segment and the second connecting segment. The second connecting segment is used to connect the insulating component and the second snap-fit ​​segment. The second snap-fit ​​segment is inserted into the second snap-fit ​​groove and interlocks with the second snap-fit ​​groove to form a snap-fit ​​structure, ensuring a firm connection. By controlling W2 and W3 within a suitable range, the structural strength of the second snap-fit ​​portion can be guaranteed. If the values ​​of W2 and W3 are too small, the structural strength of the second snap-fit ​​portion will be too low, and it will be difficult to injection mold the second snap-fit ​​portion.

[0021] In one optional embodiment, along the X direction, an assembly gap L3 is left between the groove wall of the second snap-fit ​​groove and the side wall of the second snap-fit ​​part, satisfying 0.02 mm ≤ L3 ≤ 0.1 mm.

[0022] Beneficial effect: By leaving an assembly gap between the groove wall of the second snap-fit ​​slot and the side wall of the second snap-fit ​​part, it is easy for the second snap-fit ​​part to be inserted into the second snap-fit ​​slot, which facilitates assembly.

[0023] 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.

[0024] Beneficial effects: The battery cell of this utility model has first snap-fit ​​grooves at both ends of the insulation component along its length, and first snap-fit ​​parts corresponding to the first snap-fit ​​grooves are provided on the upper surface of the cover plate, so that the cover plate and the insulation component are snap-fitted and fixed, and the connection is firm. This can avoid the situation where the ends of the rivet block and the insulation component are warped due to excessive length, reduce the risk of poor flatness of the rivet block, thereby improving the welding quality in the battery cell assembly stage, and also ensuring the resistance stability between the rivet block and the cover plate, thereby ensuring voltage stability.

[0025] Thirdly, the present invention also provides a battery pack, comprising: at least one of the above-mentioned battery cells.

[0026] Beneficial effects: Since the battery pack includes battery cells, it has the same effects as the battery cells, which will not be elaborated here. Attached Figure Description

[0027] 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.

[0028] 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 a portion of point B in the middle; Figure 6This is a top view of a battery cell cover assembly before the first snap-fit ​​section is bent, according to an embodiment of the present invention. Figure 7 for Figure 6 Sectional view at CC; Figure 8 for Figure 7 A magnified view of a portion of point D in the middle; Figure 9 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 10 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 11 This 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 12 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 13 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.

[0029] Explanation of reference numerals in the attached figures: 1. Cover plate; 101. Mounting hole; 102. First snap-fit ​​part; 1021. First connecting section; 1022. First snap-fit ​​section; 2. Pole post; 3. Riveting block; 301. Second snap-fit ​​groove; 4. Insulating component; 401. First snap-fit ​​groove; 402. Second snap-fit ​​part; 4021. Second connecting section; 4022. Second snap-fit ​​section. Detailed Implementation

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] The battery cell also includes a housing and a cover assembly, which are welded together to form a sealed space for accommodating the electrode assembly. In blade batteries, the cover assembly typically uses a single-pole riveted cover, meaning the pole and cover are riveted together as a single unit using a riveting process.

[0038] 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.

[0039] The following is combined Figures 1 to 13 The following describes embodiments of the present invention.

[0040] 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, 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.

[0041] The insulating component 4 has first snap-fit ​​grooves 401 at its two opposite ends along the X direction. The upper surface of the cover plate 1 has first snap-fit ​​parts 102 that correspond one-to-one with the first snap-fit ​​grooves 401. The cover plate 1 is snapped into the first snap-fit ​​grooves 401 through the first snap-fit ​​parts 102 and connected to the insulating component 4.

[0042] As can be seen, the battery cell cover assembly provided in this embodiment of the present invention has first snap-fit ​​grooves 401 at both ends of the insulating member 4 along its length, and first snap-fit ​​parts 102 corresponding to the first snap-fit ​​grooves 401 are provided on the upper surface of the cover plate 1, so that the cover plate 1 and the insulating member 4 are snap-fitted and fixed, and the connection is firm. This can avoid the situation where the ends of the rivet block 3 and the insulating member 4 are warped due to being too long, reduce the risk of poor flatness of the rivet block 3, thereby improving the welding quality in the battery cell assembly stage, and also ensuring the resistance stability between the rivet block 3 and the cover plate 1, thereby ensuring voltage stability.

[0043] 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.

[0044] In one embodiment, along the Z direction, the upper surface of the insulating member 4 is further provided with at least two second snap-fit ​​portions 402, and the at least two second snap-fit ​​portions 402 are distributed along the X direction on opposite sides of the pole post 2. The lower surface of the riveting block 3 is provided with second snap-fit ​​grooves 301 corresponding one-to-one with the second snap-fit ​​portions 402, and the riveting block 3 is snapped into the second snap-fit ​​grooves 301 through the second snap-fit ​​portions 402 and snapped into the insulating member 4.

[0045] By providing at least two second snap-fit ​​portions 402 on the upper surface of the insulating component 4 and providing second snap-fit ​​grooves 301 on the lower surface of the riveting block 3 that correspond one-to-one with the second snap-fit ​​portions 402, the riveting block 3 and the insulating component 4 are snap-fitted and fixed, thereby improving the connection stability of the riveting block 3, further improving the welding quality during the battery cell assembly stage, and ensuring the resistance stability between the riveting block 3 and the cover plate 1, thus ensuring voltage stability.

[0046] It should be noted that the number of second snap-fit ​​portions 402 provided on the upper surface of the insulating member 4 can be selected as two, three, or more as needed. For example, as Figure 4 and Figure 11 As shown, two second snap-fit ​​portions 402 are provided on the upper surface of the insulating member 4.

[0047] It should be noted that the present invention does not limit the snap-fit ​​structure between the first snap-fit ​​part 102 and the first snap-fit ​​groove 401, as long as the first snap-fit ​​part 102 and the first snap-fit ​​groove 401 can be snap-fitted and fixed.

[0048] In one embodiment, such as Figure 5 As shown, the first snap-fit ​​portion 102 includes a first connecting segment 1021 and a first snap-fit ​​segment 1022 connected to each other. The first connecting segment 1021 extends along the Z direction, and the first snap-fit ​​segment 1022 is bent relative to the first connecting segment 1021 and extends along the X direction and is inserted into the first snap-fit ​​groove 401, and the first snap-fit ​​segment 1022 abuts against the groove wall of the first snap-fit ​​groove 401.

[0049] It should be noted that the cover plate 1 is usually made of metal, such as aluminum plate or stainless steel plate. Taking aluminum plate as an example, a vertical first snap-fit ​​part 102 is formed by rolling the upper surface of the aluminum plate. The upper end of the first snap-fit ​​part 102 is bent and inserted into the first snap-fit ​​groove 401. The first snap-fit ​​part 102 clamps the insulating part 4, thereby realizing the snap-fit ​​fixation between the cover plate 1 and the insulating part 4.

[0050] Compared to the snap-fit ​​structure in which the first snap-fit ​​part 102 is provided on the insulating component 4 and the first snap-fit ​​groove 401 is provided on the cover plate 1, the first snap-fit ​​part 102 in this embodiment of the utility model has higher structural strength, stronger connection stability, and is not easily worn. The first snap-fit ​​part 102 can also play a limiting role in the assembly process of the insulating component 4.

[0051] like Figures 6 to 8 As shown, before bending, both the first connecting section 1021 and the first locking section 1022 extend along the Z direction and form a vertical limiting member, which can provide a limit for the assembly of the insulating member 4.

[0052] like Figures 3 to 5 As shown, after the first snap-fit ​​segment 1022 is bent, the insulating component 4 can be clamped between the first snap-fit ​​segment 1022 and the cover plate 1, which makes the connection firm, easy to assemble, and has high structural strength.

[0053] Furthermore, in one embodiment, such as Figure 5 As shown, the length of the first snap-fit ​​segment 1022 along the X direction is L1, satisfying 0.3 mm ≤ L1 ≤ 1 mm. By controlling L1 within a suitable range, it can be ensured that the first snap-fit ​​segment 1022 has sufficient clamping width, guaranteeing the clamping effect on the insulating component 4 after bending, and preventing the ends of the insulating component 4 from warping in the length direction. If the value of L1 is too small, the first snap-fit ​​segment 1022 will be too short, making it difficult to clamp the insulating component 4, and the ends of the insulating component 4 will easily warp in the length direction. If the value of L1 is too large, the first snap-fit ​​segment 1022 will be too long, easily causing material waste.

[0054] For example, in this embodiment of the present invention, the value of L1 can be 0.3 mm, 0.5 mm, 0.7 mm, 0.9 mm, 1 mm, etc.

[0055] Furthermore, in one embodiment, such as Figure 5 As shown, the width of the first card slot 401 along the Z direction is T1, which satisfies T1 > L1 and 1 mm ≤ T1 ≤ 2.5 mm. By controlling T1 within a suitable range, sufficient bending space can be provided for the first card segment 1022, avoiding interference between the first card segment 1022 and the first card slot 401.

[0056] For example, in this embodiment of the present invention, the value of T1 can be 1 mm, 1.5 mm, 2 mm, 2.5 mm, etc.

[0057] Furthermore, in one embodiment, such as Figure 5 As shown, the groove depth of the first snap-fit ​​groove 401 along the X direction is T2, which satisfies T2 > L1 and 0.5 mm ≤ T2 ≤ 1.5 mm. By controlling T2 within a suitable range, sufficient bending space can be provided for the first snap-fit ​​segment 1022, and the first snap-fit ​​segment 1022 can be ensured to press the insulating member 4 tightly.

[0058] For example, in this embodiment of the present invention, the value of T2 can be 0.5 mm, 0.75 mm, 1 mm, 1.25 mm, 1.5 mm, etc.

[0059] Furthermore, for ease of assembly, the length of the first connecting section 1021 extending beyond the upper surface of the cover plate 1 is generally equal to or slightly greater than the distance between the first snap-fit ​​groove 401 and the lower surface of the insulating member 4, so that the first snap-fit ​​part 102 can be aligned with the groove wall of the first snap-fit ​​groove 401 after bending.

[0060] In one embodiment, such as Figure 1 As shown, the length of the first snap-fit ​​groove 401 along the Y direction is L2, and the width of the insulating member 4 along the Y direction is W1, satisfying 0.4≤L2 / W1≤1. By controlling L2 / W1 within a suitable range, it can be ensured that the first snap-fit ​​part 102 and the first snap-fit ​​groove 401 have sufficient engagement area, thereby ensuring the engagement stability between the two ends of the insulating member 4 along its length and the cover plate 1, and preventing the ends of the insulating member 4 from lifting up. If the value of L2 / W1 is too small, the engagement range is small, and the insulating member 4 still has the risk of lifting up.

[0061] Specifically, in the Y direction, such as Figure 1 and Figure 2 As indicated by the arrow Y in the diagram.

[0062] For example, in this embodiment of the invention, the value of L2 / W1 can be 0.4, 0.6, 0.8, 1, etc.

[0063] It should be noted that the present invention does not limit the snap-fit ​​structure between the second snap-fit ​​part 402 and the second snap-fit ​​groove 301, as long as the second snap-fit ​​part 402 and the second snap-fit ​​groove 301 can be snap-fitted and fixed.

[0064] 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 second snap-fit ​​portion 402 on the upper surface of the insulating component 4, making the manufacturing process simple. The insulating component 4 also has a certain degree of elasticity; therefore, the second snap-fit ​​portion 402 and the second snap-fit ​​groove 301 can be engaged by interference fit. Furthermore, the riveting block 3 is usually made of aluminum, and the second snap-fit ​​groove 301 can be formed by machining.

[0065] Compared to the structure of providing a second snap-fit ​​groove 301 on the upper surface of the insulating component 4 and a second snap-fit ​​part 402 on the lower surface of the riveting block 3, this embodiment of the utility model can ensure that the insulating component 4 has sufficient strength and guarantees the insulation effect, while also facilitating the processing and manufacturing of the second snap-fit ​​part 402 and the second snap-fit ​​groove 301.

[0066] In one embodiment, such as Figure 5 As shown, the second snap-fit ​​portion 402 includes a second connecting section 4021 and a second snap-fit ​​section 4022 connected to each other. The second connecting section 4021 extends along the Z direction, and the second snap-fit ​​section 4022 extends along the X direction. The width of the second connecting section 4021 along the X direction is W2, and the width of the second snap-fit ​​section 4022 along the X direction is W3, satisfying W3>W2, 0.5 mm≤W2≤1 mm, and 0.6 mm≤W3≤1.5 mm.

[0067] The width of the second snap-fit ​​segment 4022 is greater than the width of the second connecting segment 4021, forming a snap-fit ​​step between the second snap-fit ​​segment 4022 and the second connecting segment 4021. The second connecting segment 4021 is used to connect the insulating component 4 and the second snap-fit ​​segment 4022. The second snap-fit ​​segment 4022 is inserted into the second snap-fit ​​groove 301 and interlocks with the second snap-fit ​​groove 301 to form a snap-fit ​​structure, ensuring a firm connection. By controlling W2 and W3 within a suitable range, the structural strength of the second snap-fit ​​portion 402 can be guaranteed. If the values ​​of W2 and W3 are too small, the structural strength of the second snap-fit ​​portion 402 will be too low, and it will be difficult to injection mold the second snap-fit ​​portion 402.

[0068] Specifically, the second snap-fit ​​segment 4022 and the second connecting segment 4021 form an L-shaped barbed snap, and there is a first stepped surface between them. Correspondingly, the second snap-fit ​​groove 301 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 second snap-fit ​​segment 4022 is larger than the opening area of ​​the first sub-groove. Under elastic action, the second snap-fit ​​segment 4022 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 second snap-fit ​​part 402 is snapped into the second snap-fit ​​groove 301, forming a snap-fit ​​fixing structure.

[0069] For example, in this embodiment of the present invention, the value of W2 can be 0.5 mm, the value of W3 can be 0.6 mm, or the value of W2 can be 0.7 mm, the value of W3 can be 1 mm; or the value of W2 can be 1 mm, the value of W3 can be 1.5 mm, etc.

[0070] In other embodiments, the second snap-fit ​​segment 502 and the second 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.

[0071] In one embodiment, such as Figure 5 As shown, along the X direction, an assembly gap L3 is provided between the groove wall of the second snap-fit ​​groove 301 and the side wall of the second snap-fit ​​part 402, satisfying 0.02 mm ≤ L3 ≤ 0.1 mm. By providing an assembly gap between the groove wall of the second snap-fit ​​groove 301 and the side wall of the second snap-fit ​​part 402, it is easier for the second snap-fit ​​part 402 to be inserted into the second snap-fit ​​groove 301, thus facilitating assembly.

[0072] For example, in this embodiment of the present invention, the value of L3 can be 0.02 mm, 0.04 mm, 0.06 mm, 0.08 mm, 0.1 mm, etc.

[0073] According to an embodiment of the present invention, another aspect provides a battery cell, comprising: a housing and a battery cell cover assembly. 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.

[0074] The battery cell provided in this embodiment of the utility model has first snap-fit ​​grooves 401 at both ends of the insulation component 4 along its length, and first snap-fit ​​parts 102 corresponding to the first snap-fit ​​grooves 401 are provided on the upper surface of the cover plate 1, so that the cover plate 1 and the insulation component 4 are snap-fitted and fixed, and the connection is firm. This can avoid the situation where the ends of the rivet block 3 and the insulation component 4 are warped due to being too long, reduce the risk of poor flatness of the rivet block 3, thereby improving the welding quality in the battery cell assembly stage, and also ensuring the resistance stability between the rivet block 3 and the cover plate 1, thereby ensuring voltage stability.

[0075] 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.

[0076] Since the battery pack includes battery cells and has the same effect as the battery cells, it will not be elaborated on here.

[0077] In this embodiment of the invention, the battery pack may further include a housing, in which the battery cells are housed.

[0078] 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.

[0079] 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 and sandwiched between the cover plate and the riveting block. The insulating component has first snap-fit ​​grooves at opposite ends along the X direction. The upper surface of the cover plate has first snap-fit ​​parts that correspond one-to-one with the first snap-fit ​​grooves. The cover plate is snapped into the first snap-fit ​​grooves through the first snap-fit ​​parts and connected to the insulating component.

2. The cell cover assembly according to claim 1, characterized in that, Along the Z direction, the upper surface of the insulating component is provided with at least two second snap-fit ​​portions, and the at least two second snap-fit ​​portions are distributed along the X direction on opposite sides of the pole post. The lower surface of the riveting block is provided with second snap-fit ​​grooves that correspond one-to-one with the second snap-fit ​​portions. The riveting block is snapped into the second snap-fit ​​grooves through the second snap-fit ​​portions and snapped into the insulating component.

3. The cell cover assembly according to claim 2, characterized in that, The first snap-fit ​​portion includes a first connecting segment and a first snap-fit ​​segment connected to each other. The first connecting segment extends along the Z direction, and the first snap-fit ​​segment bends relative to the first connecting segment and extends along the X direction and inserts into the first snap-fit ​​groove, and the first snap-fit ​​segment abuts against the groove wall of the first snap-fit ​​groove.

4. The cell cover assembly according to claim 3, characterized in that, The length of the first snap-fit ​​segment along the X direction is L1, which satisfies 0.3 mm ≤ L1 ≤ 1 mm.

5. The cell cover assembly according to claim 4, characterized in that, The width of the first snap-fit ​​groove along the Z direction is T1, which satisfies T1>L1, 1 mm≤T1≤2.5 mm; And / or, the groove depth of the first snap-fit ​​groove along the X direction is T2, satisfying T2>L1, 0.5 mm≤T2≤1.5 mm.

6. The cell cover assembly according to any one of claims 1 to 5, characterized in that, The length of the first snap-fit ​​groove along the Y direction is L2, and the width of the insulating component along the Y direction is W1, satisfying 0.4≤L2 / W1≤1.

7. The cell cover assembly according to any one of claims 2 to 5, characterized in that, The second snap-fit ​​portion includes a second connecting segment and a second snap-fit ​​segment connected together. The second connecting segment extends along the Z direction, and the second snap-fit ​​segment extends along the X direction. The width of the second connecting segment along the X direction is W2, and the width of the second snap-fit ​​segment along the X direction is W3, satisfying W3>W2, 0.5 mm≤W2≤1 mm, and 0.6 mm≤W3≤1.5 mm.

8. The cell cover assembly according to claim 7, characterized in that, Along the X direction, there is an assembly gap L3 between the groove wall of the second snap-fit ​​groove and the side wall of the second snap-fit ​​part, which satisfies 0.02 mm ≤ L3 ≤ 0.1 mm.

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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