Battery cell cover plate assembly and battery cell

Abstract

The utility model relates to the technical field of batteries, and provides a battery cell cover plate assembly and a battery cell. The battery cell cover plate assembly comprises a cover plate body and a lower plastic structure; the lower plastic structure is attached to one side, facing the battery cell, of the cover plate body; the lower plastic structure comprises a first plate and a second plate which are connected with each other, one end, facing the second plate, of the first plate is provided with a first step part, and one end, facing the first plate, of the second plate is provided with a second step part; the first step part is provided with a matching part extending towards the second plate part, the second step part is correspondingly provided with a matching groove, and the matching part is matched in the matching groove in shape. According to the utility model, the split lower plastic limiting design is adopted, the lower plastic on the longer side is supported through the assembly limiting between the first plate and the second plate, the drooping height is prevented from being too large, and meanwhile, the lower plastic structure is prevented from shaking along the width direction of the lower plastic structure by virtue of the assembly limiting between the matching piece and the matching groove, so that the battery cell is not produced well. The production efficiency is improved; the production cost is reduced.

Description

Technical Field

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

[0002] In current technologies, the lower plastic structure of the battery cell cover assembly is typically designed as a single unit, where the plastic component is integrally molded or fixed as a single structure and attached to the side of the cover body facing the battery cell. However, when the lower plastic structure is long (e.g., for large-capacity battery cells), its own weight or external forces may cause the ends to bend or sag downwards. This sag not only affects the sealing performance between the lower plastic and the battery cell or cover body but may also cause poor contact or short circuit risks for internal components. Furthermore, in existing technologies, the positioning of the lower plastic structure largely relies on fixing points or simple snap-fits on the cover body, lacking precise constraints in the width direction. For example, the plastic component may shift during assembly, leading to poor sealing or functional failure. Utility Model Content

[0003] In view of this, the present invention provides a cell cover plate assembly and a cell to solve the problem of poor stability of the lower plastic structure in related technologies.

[0004] In a first aspect, the present invention provides a battery cell cover assembly, including a cover body and a lower plastic structure; the lower plastic structure is attached to the side of the cover body facing the battery cell;

[0005] The lower plastic structure includes a first plate and a second plate that are connected to each other. The first plate has a first step at one end facing the second plate, and the second plate has a second step at one end facing the first plate.

[0006] The first step portion is provided with a mating component extending toward the second plate, and the second step portion is provided with a corresponding mating groove, the shape of which fits into the mating groove.

[0007] Beneficial effects: This utility model provides a battery cell cover assembly that adopts a split lower plastic limiting design with mating parts and mating grooves respectively. Through the assembly limiting between the two plates in the lower plastic structure, the lower plastic on the longer side is supported, preventing excessive sagging. At the same time, the assembly limiting between the mating parts and the mating grooves prevents the lower plastic structure from shaking along its width direction, which would cause poor battery cell manufacturing. This improves production efficiency and reduces production costs.

[0008] In one alternative embodiment, the side of the mating groove adjacent to the cover plate body is closed, and the side of the mating groove away from the cover plate body is open.

[0009] Beneficial effects: The presence of the closed side can enhance the insulation and structural strength of the lower plastic structure. Furthermore, when the first and second plates are assembled, the presence of the closed side reduces the total gap length of the lower plastic structure facing the external environment, thereby reducing the interference of the external environment on the inside of the cell.

[0010] In one optional embodiment, the number of mating parts is one and the number of mating grooves is also one. The mating parts are located at the middle position along the width direction of the first step portion, and correspondingly, the mating grooves are also located at the middle position along the width direction of the second step portion.

[0011] Alternatively, the number of mating parts is at least two and the number of mating grooves is also at least two. The mating parts are spaced apart along the width direction of the first step, and the mating grooves are spaced apart along the width direction of the second step. The mating parts and the mating grooves correspond one-to-one.

[0012] Beneficial effects: The number of mating parts and mating slots can be flexibly adjusted according to the width of the battery cell to adapt to different specifications and thus be suitable for different application scenarios.

[0013] In one optional embodiment, the mating member has a protruding positioning member on one side surface facing the bottom wall of the mating groove, and correspondingly, the bottom wall of the mating groove has a recessed positioning groove, and the positioning member fits into the positioning groove.

[0014] Beneficial effects: The engagement of the positioning element and the positioning groove controls the positioning error of the mating parts to the micrometer level, ensuring precise alignment of the first and second plates in three dimensions. Simultaneously, the engagement of the positioning element and the positioning groove creates multi-directional constraints, preventing the mating parts from dislodging or shifting due to lateral or rotational forces even under vibration or impact loads. Furthermore, precise three-dimensional positioning reduces the gap between the mating parts and the mating groove, preventing seal failure or contaminant intrusion caused by gaps.

[0015] In one alternative embodiment, the positioning member extends along the length direction of the first plate, and correspondingly, the positioning groove extends along the length direction of the second plate.

[0016] Beneficial effects: The linear extension design of the positioning element and positioning groove can constrain the displacement of the mating parts in the length direction, eliminate longitudinal degrees of freedom, and control the positioning error of the mating parts in the length direction to a minimum. At the same time, the elongated guide structure continuously corrects the position during assembly, ensuring that the two plates are perfectly aligned in the width, height, and length directions, avoiding sealing failure or functional abnormalities caused by misalignment. In addition, the elongated positioning element and positioning groove form a continuous constraint surface, effectively resisting external forces such as longitudinal tension, compression, torsion, or lateral sway.

[0017] In one optional embodiment, the sum of the height of the positioning member and the thickness of the mating member is H, and its value ranges from 2m ≤ H ≤ 7mm.

[0018] Beneficial effects: This embodiment can ensure that the mating parts and positioning parts have both rigidity and light weight within the range of 2mm to 7mm, and can avoid problems such as assembly difficulties or sealing failure caused by improper size.

[0019] In one optional embodiment, the thickness of the mating component is X, and its value ranges from 0.5mm to X to 2.5mm; the length of the mating component is Y and its length is Z, and their value ranges are 3mm to Y to 25mm and 5mm to Z to 15mm, respectively.

[0020] Beneficial effects: The above parameter range can ensure the minimum functional requirements of the mating parts in three dimensions. At the same time, by limiting the upper limits of X, Y, and Z, the waste of plastic materials can be reduced.

[0021] In one optional embodiment, the wall thickness of the mating groove is O, and its value range is: 0.5mm≤O≤2.5mm; and the bottom wall of the mating groove does not extend beyond the surface of the second plate facing the cover plate body.

[0022] Beneficial effects: A reasonable range of wall thickness O ensures the stability of the mating groove when subjected to insertion force, vibration, or impact from the mating parts, while also preventing interference between the mating groove and other components. Furthermore, since the bottom wall of the mating groove does not extend beyond the outer surface of the second plate, the assembly between the second plate and the cover plate body is guaranteed to be undisturbed.

[0023] In one optional embodiment, the gap between the mating component and the mating groove along the width direction is P, and its value ranges from 0.05mm < P ≤ 1mm; the gap between the mating component and the mating groove along the direction perpendicular to the cover plate body is Q, and its value ranges from 0 ≤ Q ≤ 3mm.

[0024] Beneficial effects: The range of values ​​for P ensures accurate positioning of mating parts in the width direction while allowing reasonable tolerances to avoid assembly jamming; the range of values ​​for Q balances perfect fit (Q=0) and tolerance tolerance (Q≤3mm). For example, when Q=0, the mating parts and the mating groove form a full contact seal; while when Q=3mm, structural stability can still be ensured through the secondary constraints of the positioning parts and the positioning groove.

[0025] Secondly, the present invention also provides a battery cell, including the battery cell cover assembly as described in the first aspect embodiment of the present invention. Attached Figure Description

[0026] 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.

[0027] Figure 1 This is a schematic diagram of the structure of a battery cell cover assembly according to an embodiment of the present invention;

[0028] Figure 2 For along Figure 1 Sectional view of line AA in the middle;

[0029] Figure 3 This is one of the structural schematic diagrams of the first plate component according to an embodiment of the present utility model;

[0030] Figure 4 This is a second schematic diagram of the structure of the first plate component according to an embodiment of the present utility model;

[0031] Figure 5 This is one of the structural schematic diagrams of the second plate component according to an embodiment of the present utility model;

[0032] Figure 6 This is a second schematic diagram of the structure of the second plate component according to an embodiment of the present utility model;

[0033] Figure 7 This is a schematic diagram of the structure of a cell cover plate assembly according to another embodiment of the present invention;

[0034] Figure 8 For along Figure 7 Sectional view of the middle BB line;

[0035] Figure 9 This is one of the structural schematic diagrams of the first plate component according to another embodiment of the present utility model;

[0036] Figure 10 This is a second schematic diagram of the structure of the first plate component according to another embodiment of the present utility model;

[0037] Figure 11 This is one of the structural schematic diagrams of the second plate component according to another embodiment of the present utility model;

[0038] Figure 12 This is a second schematic diagram of the structure of the second plate component according to another embodiment of the present invention.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1. First plate; 11. First pole post hole; 12. First step portion; 13. Mating part; 14. Positioning part; 2. Second plate; 21. Second pole post hole; 22. Second step portion; 23. Mating groove; 24. Positioning groove; 25. Connecting plate; 3. Cover plate body. Detailed Implementation

[0041] 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.

[0042] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0044] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0045] The present invention provides a cell cover plate assembly and a cell having the cell cover plate assembly, with reference to the accompanying drawings.

[0046] like Figures 1 to 12 As shown, the battery cell cover assembly according to the first aspect of the present invention includes a cover body 3 and a lower plastic structure; the lower plastic structure is attached to the side of the cover body 3 facing the battery cell.

[0047] The lower plastic structure includes a first plate 1 and a second plate 2 connected to each other. The end of the first plate 1 facing the second plate 2 is provided with a first step portion 12, and the end of the second plate 2 facing the first plate 1 is provided with a second step portion 22. The first step portion 12 is provided with a mating part 13 extending toward the second plate 2, and the second step portion 22 is provided with a corresponding mating groove 23, the mating part 13 being shaped to fit into the mating groove 23.

[0048] The specific structure of the battery cell cover assembly according to an embodiment of this utility model is described below:

[0049] The battery cell cover assembly of this utility model includes a cover body 3 and a lower plastic structure. The cover body 3 is typically made of metal (such as aluminum or stainless steel) and is used to seal the top of the battery cell and provide electrical connection. The lower plastic structure consists of a first plate 1 and a second plate 2, which are respectively attached to the side of the cover body 3 facing the battery cell. Their functions include insulation, sealing, and fixing of the internal components of the battery cell.

[0050] The first plate 1 and the second plate 2 are both independent components, connected to the cover plate body 3 by bonding, snap-fitting, or other fixing methods, and positioned by the mating part 13 and the mating groove 23. Specifically, the first plate 1 has a first step portion 12 at the end facing the second plate 2. This step portion extends along the length of the first plate 1, forming a stepped structure (such as a decrease or increase in height). A mating part 13 is provided on the first step portion 12. This mating part 13 is a plate-shaped structure (such as rectangular, trapezoidal, or arc-shaped), extends towards the second plate 2, and its end protrudes from the side wall of the first step portion 12.

[0051] The second plate 2 has a second step 22 at one end facing the first plate 1, which corresponds to the first step 12. The step height and position of the second step 22 are completely matched with those of the first step 12. A mating groove 23 is provided on the second step 22 at the position corresponding to the mating part 13. The mating groove 23 is a recessed structure (such as a groove or slot) and its shape is completely matched with that of the mating part 13 (such as a rectangle, trapezoid, or arc) to accommodate and fix the mating part 13.

[0052] It is understandable that when the first plate 1 and the second plate 2 are respectively installed onto the cover plate body 3, the mating part 13 of the first step portion 12 is embedded into the mating groove 23 of the second step portion 22. Through shape matching, the two plates are precisely aligned in the width direction, eliminating lateral gaps. In this way, the tight fit between the mating part 13 and the mating groove 23 prevents lateral displacement caused by external forces or vibrations after assembly, ensuring structural stability. Simultaneously, the stepped structure of the first step portion 12 and the second step portion 22 not only positions the mating part 13 and the mating groove 23 but also forms a support point through the height difference, distributing the force on the two plates and preventing sagging due to excessive length.

[0053] Based on the above description of the specific structure, the working principle of the battery cell cover of this utility model is as follows: the first plate 1 and the second plate 2 are respectively connected to the cover body 3. The two plates are mutually constrained in the width direction by the fitting part 13 and the fitting groove 23 to ensure that their positions are fixed. At the same time, the structural difference of the step further constrains the relative position of the two plates, avoiding displacement or deformation caused by external force or thermal expansion and contraction.

[0054] Further, the assembly steps of this utility model are as follows: The first plate 1 is fixed to a designated position on the cover plate body 3 by adhesive bonding or snap-fit. Then, the second plate 2 is moved to the other side of the cover plate body 3, aligning the mating groove 23 of the second step portion 22 with the mating part 13 of the first step portion 12. Pressure is applied to the second plate 2 towards the first plate 1, causing the mating part 13 to be fully embedded in the mating groove 23, completing the positioning in the width direction. Simultaneously, the second plate 2 is connected to the cover plate body 3 by adhesive bonding, snap-fit, or other fixing methods. Finally, the battery cell cover plate is inspected to confirm that the two plates are stably mated in the width direction, and that the mating part 13 is fully engaged with the mating groove 23, thereby ensuring structural stability.

[0055] In current technologies, the lower plastic structure of the battery cell cover assembly typically employs an integral design, where the plastic component is molded as a single piece or fixed as a single structure and attached to the side of the cover body 3 facing the battery cell. However, when the lower plastic structure is long (e.g., for large-capacity battery cells), its own weight or external forces may cause the ends to bend or sag downwards. This sag not only affects the sealing performance between the lower plastic and the battery cell or cover body 3 but may also cause poor contact or short circuit risks for internal components. Furthermore, in existing technologies, the positioning of the lower plastic structure largely relies on the fixing points or simple snap-fits of the cover body 3, lacking precise constraints in the width direction. For example, the plastic component may shift during assembly, leading to poor sealing or functional failure.

[0056] Therefore, in order to solve the technical defects existing in the above-mentioned related technologies, this utility model provides a battery cell cover plate assembly, which adopts a split lower plastic limiting design and has mating parts 13 and mating grooves 23 respectively. Through the assembly limiting between the two plates in the lower plastic structure, the lower plastic on the longer side is supported to prevent excessive drooping. At the same time, the assembly limiting between the mating parts 13 and the mating grooves 23 prevents the lower plastic structure from shaking along its width direction, which would cause poor battery cell manufacturing, thereby improving production efficiency and reducing production costs.

[0057] Furthermore, the battery cell cover assembly of this utility model has at least the following advantages compared to related technologies:

[0058] (1) Suppressing sagging in the length direction: The split structure significantly reduces the amount of sagging at the end by shortening the length of individual plates and utilizing the support of the stepped part, thereby improving the fit and sealing between the lower plastic structure and the battery cell and the cover plate body 3, and reducing the risk of short circuit.

[0059] (2) Eliminate sway in the width direction: The precise fitting of the mating part 13 and the mating groove 23 and the alignment design of the step part control the lateral sway amplitude within a small range, avoiding friction or misalignment between the plastic parts and the internal components of the battery cell.

[0060] (3) Improve assembly flexibility and adaptability: The modular design allows the first plate 1 and the second plate 2 to be adjusted independently in length or width, which can quickly adapt to different specifications of battery cells, reduce manufacturing costs and simplify inventory management.

[0061] (4) Simplified assembly process: The guiding function of mating parts 13 and mating groove 23 reduces the reliance on precision equipment, enables rapid positioning and installation, and improves production efficiency.

[0062] (5) Structural stability optimization: Simultaneously solve the problems of sagging in the length direction and swaying in the width direction to ensure the long-term stability of the cell cover assembly under vibration or external force.

[0063] like Figure 2 , Figure 5 and Figure 6 As shown, according to some embodiments of the present invention, the side of the mating groove 23 adjacent to the cover plate body 3 is closed, and the side of the mating groove 23 away from the cover plate body 3 is open.

[0064] In this embodiment, the side of the mating groove 23 adjacent to the cover plate body 3 (i.e., the side facing the cover plate body 3 and away from the inside of the battery cell) is set as a closed structure to form a physical barrier layer. The closed side can be achieved by a continuous wall of plastic material or additional reinforcing ribs, completely sealing the end of the mating groove 23 and preventing direct contact between the external environment and the inside of the mating groove 23.

[0065] The side of the mating groove 23 away from the cover plate body 3 (i.e. the side facing the inside of the cell) is an open structure, allowing the mating part 13 to be inserted or removed from this side.

[0066] It is understandable that, since the closed side is adjacent to the cover plate body 3 and directly faces the external environment of the battery cell (such as air, moisture, or conductive dust), its closed structure can effectively prevent external conductive substances from entering the battery cell through the gaps in the mating groove 23, reducing the risk of short circuits. In contrast, the traditional open mating groove 23 may suffer insulation failure due to the intrusion of external contaminants, while the physical isolation of the closed side significantly improves the overall insulation reliability of the lower plastic structure.

[0067] Furthermore, the structural design of the closed side (such as thickened plastic walls or ribs) can enhance the deformation resistance of the end of the mating groove 23. Especially after the mating part 13 is inserted, the supporting effect of the closed side can disperse external forces (such as collisions and compressions) and prevent the mating groove 23 from generating gaps due to pressure deformation. Compared with the open structure, the local reinforcement of the closed side reduces the weak points of the mating groove 23 and improves the impact resistance and fatigue resistance of the lower plastic structure.

[0068] It should also be noted that during the assembly process, there may be minute gaps (such as tolerance gaps) between the mating surfaces of the mating parts 13 and the mating groove 23. If the mating groove 23 is completely open, the gaps may be exposed to the external environment; however, in this embodiment, the design of the closed side limits the gaps to one side inside the cell (the open side), and the external environment only comes into contact with the closed end of the mating groove 23. The total length of the gap exposed to the outside is reduced, thereby preventing external contaminants from entering the cell through the gaps.

[0069] In summary, the presence of the closed side can enhance the insulation capability and structural strength of the lower plastic structure. Furthermore, when the first plate 1 and the second plate 2 are assembled, the presence of the closed side reduces the total gap length of the lower plastic structure facing the external environment, thereby reducing the interference of the external environment on the inside of the cell.

[0070] like Figures 1 to 12 As shown, according to some embodiments of the present invention, the number of mating parts 13 is at least one, and the number of mating grooves 23 is at least one and equal to the number of mating parts 13.

[0071] like Figures 7 to 12 As shown, in a specific embodiment of this utility model, the number of mating parts 13 is one and the number of mating grooves 23 is also one. The mating parts 13 are located at the middle position along the width direction of the first step portion 12, and correspondingly, the mating grooves 23 are also located at the middle position along the width direction of the second step portion 22.

[0072] In this embodiment, a mating part 13 is provided on the first step portion 12, located at the middle position in its width direction; a mating groove 23 is correspondingly provided on the second step portion 22, located at the middle position in its width direction.

[0073] In this way, the mating part 13 and the mating groove 23 in the middle position serve as the central positioning point, ensuring that the first plate 1 and the second plate 2 are symmetrically aligned in the width direction, reducing assembly offset; at the same time, the symmetrical design can balance the force on the two plates and avoid structural deformation caused by eccentric load.

[0074] It should be noted that the above embodiments are applicable to scenarios where the stability requirements in the width direction are low (such as when the cell width is small or the load is evenly distributed).

[0075] like Figures 1 to 6 As shown, in another specific embodiment of this utility model, the number of mating parts 13 is at least two and the number of mating grooves 23 is also at least two. The mating parts 13 are distributed at intervals along the width direction of the first step portion 12, and the mating grooves 23 are arranged at intervals along the width direction of the second step portion 22. The mating parts 13 and the mating grooves 23 correspond one-to-one.

[0076] In this embodiment, at least two mating parts 13 (such as two or more) are provided on the first step portion 12, and are distributed at intervals along its width direction; at least two mating grooves 23 are correspondingly provided on the second step portion 22, and are distributed at intervals along its width direction, and correspond one-to-one with the mating parts 13.

[0077] In this way, multiple mating parts 13 / grooves are distributed along the width direction, forming multi-point support and significantly enhancing the anti-sway capability of the two plates in the width direction. At the same time, the spaced distribution can disperse the lateral force, reduce local stress concentration, and avoid structural deformation caused by external forces. In addition, the one-to-one corresponding mating parts 13 and mating grooves 23 ensure that each positioning point is precisely engaged, eliminating gaps in the width direction.

[0078] It should be noted that the above embodiments are applicable to wide-width battery cells or high-load scenarios, and improve structural rigidity through multi-point support. The number of mating parts 13 / slots can be flexibly adjusted according to the width of the battery cell (e.g., 3, 4, etc.) to adapt to different specifications, and the spacing between the mating parts 13 can be adjusted according to actual needs, thereby balancing structural strength and material cost.

[0079] like Figures 9 to 12 As shown, according to some embodiments of the present invention, a protruding positioning member 14 is provided on one side surface of the mating member 13 facing the bottom wall of the mating groove 23. Correspondingly, a recessed positioning groove 24 is provided on the bottom wall of the mating groove 23, and the positioning member 14 is fitted in the positioning groove 24.

[0080] In this embodiment, a protruding positioning element 14 is provided on the side surface of the mating member 13 facing the bottom wall of the mating groove 23 (i.e., the surface where the mating member 13 contacts the bottom wall of the mating groove 23). Its shape can be a protrusion, boss, snap-fit, or trapezoidal protrusion, etc. Simultaneously, a recessed positioning groove 24 is correspondingly provided on the bottom wall of the mating groove 23 (i.e., the bottom surface where the mating groove 23 contacts the mating member 13). Its shape perfectly matches the positioning element 14 (e.g., a circular recess, a trapezoidal groove, etc.).

[0081] The size and shape of the positioning element 14 must match the positioning groove 24 of the mating groove 23 to ensure that there is no gap or a very small gap after fitting. In addition, the depth of the positioning groove 24 must be sufficient to accommodate the positioning element 14, while ensuring that the mating element 13 fits tightly against the bottom wall of the mating groove 23 after being inserted.

[0082] It is understandable that when the mating part 13 is embedded in the mating groove 23, the engagement of the positioning part 14 and the positioning groove 24 can eliminate the degree of freedom of the mating part 13 in the direction perpendicular to the width (such as the height direction or the rotation direction), ensuring the precise alignment of the two plates in three-dimensional space. For example, if the mating part 13 has a slight tilt or rotation, the engagement of the positioning part 14 and the positioning groove 24 can force it to adjust to the correct angle, avoiding assembly deviation.

[0083] On the one hand, the engagement of the positioning element 14 and the positioning groove 24 forms a secondary limit, preventing the mating part 13 from loosening or shifting due to vibration, thermal expansion and contraction or external impact; on the other hand, the shape matching of the positioning element 14 and the positioning groove 24 can serve as a guide structure during assembly, helping the operator to quickly align the mating part 13 and the mating groove 23, reducing the difficulty of assembly.

[0084] In summary, the engagement of the positioning element 14 and the positioning groove 24 controls the positioning error of the mating element 13 to the micrometer level, ensuring precise alignment of the first plate 1 and the second plate 2 in three dimensions. Simultaneously, the engagement of the positioning element 14 and the positioning groove 24 creates multi-directional constraints, preventing the mating element 13 from dislodging or shifting due to lateral or rotational forces even under vibration or impact loads. Furthermore, precise three-dimensional positioning reduces the gap between the mating element 13 and the mating groove 23, preventing seal failure or contaminant intrusion caused by gaps.

[0085] like Figures 9 to 12 As shown, the positioning member 14 extends along the length direction of the first plate 1, and correspondingly, the positioning groove 24 extends along the length direction of the second plate 2.

[0086] In this embodiment, the positioning member 14 extends along the length of the first plate 1, forming a continuous or discontinuous elongated protrusion (such as a ridge, a strip-shaped boss, or a guide groove), the shape of which perfectly matches the positioning groove 24 of the second plate 2. The positioning groove 24 extends along the length of the second plate 2, and its shape perfectly matches the positioning member 14 (such as a rectangular groove, a trapezoidal groove, or a guide groove), forming an elongated recess corresponding to the positioning member 14. For example, the positioning member 14 can be designed as a straight protrusion with the same length as the mating member 13, or it can be wavy to enhance torsional resistance.

[0087] In this way, the linear extension design of the positioning element 14 and the positioning groove 24 can constrain the displacement of the mating part 13 in the length direction, eliminate longitudinal degrees of freedom, and control the positioning error of the mating part 13 in the length direction to a minimum. At the same time, the elongated guide structure continuously corrects the position during assembly, ensuring that the two plates are perfectly aligned in the width, height, and length directions, avoiding sealing failure or functional abnormalities caused by misalignment. In addition, the elongated positioning element 14 and the positioning groove 24 form a continuous constraint surface, effectively resisting external forces such as longitudinal tension, compression, torsion, or lateral sway.

[0088] Furthermore, the sum of the height of the positioning part 14 and the thickness of the mating part 13 is H, and its value ranges from 2m to H to 7mm.

[0089] In this embodiment, H = height of positioning member 14 + thickness of mating member 13, and its value ranges from 2mm ≤ H ≤ 7mm. For example, if the height of positioning member 14 is 1.5mm, the thickness of mating member 13 needs to be 0.5mm to 5.5mm to ensure that the total H is within the specified range.

[0090] It is understandable that the purpose of H≥2mm is to ensure the minimum thickness of the positioning part 14 and the mating part 13, so as to avoid bending or breakage during assembly or use due to excessive thinness; that is, if H is too small, the mating part 13 may not be able to be fully embedded in the mating groove 23 due to being too thin, resulting in insufficient positioning. For example, if H<2mm, the mating part 13 may undergo plastic deformation due to external forces (such as collisions), resulting in positioning failure.

[0091] The purpose of H≤7mm is to limit the total height of the mating part 13 and the positioning part 14, so as to avoid affecting the assembly of other structures such as the cell cover due to excessive thickness; at the same time, it reduces the amount of plastic material used and lowers manufacturing costs. That is, if H is too large, the mating part 13 may interfere with the closed side of the mating groove 23 or the cell cover and other structures, affecting the assembly process.

[0092] In this way, this embodiment can ensure that the mating part 13 and the positioning part 14 have both rigidity and light weight within the range of 2mm to 7mm, and can avoid problems such as assembly difficulties or sealing failure caused by improper size.

[0093] According to some embodiments of the present invention, the thickness of the mating part 13 is X, and its value range is: 0.5mm≤X≤2.5mm; the length of the mating part 13 is Y and its length is Z, and their value ranges are respectively: 3mm≤Y≤25mm and 5mm≤Z≤15mm.

[0094] In this embodiment, the thickness X is the vertical dimension (height direction) of the mating part 13, and the value range is 0.5mm≤X≤2.5mm; the length Y is the extension dimension of the mating part 13 along the length direction of the first plate 1, and the value range is 3mm≤Y≤25mm; the width Z is the extension dimension of the mating part 13 along the width direction of the first plate 1, and the value range is 5mm≤Z≤15mm.

[0095] For thickness X, its lower limit (0.5mm) ensures the minimum rigidity of the mating part 13, preventing bending during assembly or deformation after long-term use due to excessive thinness. For example, when X < 0.5mm, the mating part 13 may undergo plastic deformation due to external forces (such as vibration or impact), leading to positioning failure. Its upper limit (2.5mm) avoids excessive interference between the mating part 13 and the mating groove 23 due to excessive thickness, reducing the amount of plastic material used and assembly difficulty.

[0096] For the length Y, its lower limit (3mm) ensures the minimum effective contact length between the mating part 13 and the mating groove 23, preventing insufficient anti-slip capability due to excessive length; for example, when Y < 3mm, the mating part 13 may be unable to resist longitudinal loads (such as tension or compression) due to insufficient length. Its upper limit (25mm) limits the length of the mating part 13 to match the maximum width or height of the battery cell, avoiding interference with the cover plate body 3 or other components due to excessive length.

[0097] For the width Z, its lower limit (5mm) ensures the minimum contact width between the mating part 13 and the mating groove 23, providing sufficient lateral restraint to prevent lateral swaying. However, if Z < 5mm, the positioning accuracy of the mating part 13 may decrease due to insufficient width. Its upper limit (15mm) avoids overloading of the mating surface with the mating groove 23 caused by the mating part 13 being too wide, reducing local stress concentration in the plastic material.

[0098] In summary, the above parameter ranges ensure the minimum functional requirements of the mating part 13 in three dimensions. For example, when X = 0.5mm, Y = 3mm, and Z = 5mm, the assembly requirements of the basic battery cell are met; while when X = 2.5mm, Y = 25mm, and Z = 15mm, it is suitable for demanding scenarios involving high loads or large-size battery cells. Furthermore, the upper limits of X, Y, and Z reduce the waste of plastic materials.

[0099] like Figure 6 and Figure 12As shown, according to some embodiments of the present utility model, the wall thickness O of the mating groove 23 is 0, and its value range is: 0.5 mm ≤ O ≤ 2.5 mm; and the bottom wall of the mating groove 23 does not extend beyond the surface of the second plate member 2 facing the cover plate body 3.

[0100] It should be explained that the wall thickness O of the mating groove 23 is also the thickness of the side wall or the bottom wall of the mating groove 23 (the dimension perpendicular to the bottom surface of the groove), and the value range is 0.5 mm ≤ O ≤ 2.5 mm; for example, both the side wall thickness and the bottom wall thickness of the mating groove 23 need to meet this range. The bottom wall of the mating groove 23 does not extend beyond the surface of the second plate member 2 facing the cover plate body 3, that is, the outer end surface of its bottom wall is flush with or retracted from the inner surface of the second plate member 2 (close to the cover plate body 3), forming an embedded structure to avoid extending outwards and affecting the assembly process of the second plate member 2. For example, if the inner surface of the second plate member 2 is a plane, the outer end surface of the bottom wall of the mating groove 23 needs to be located within this plane.

[0101] It can be understood that on the one hand, the lower limit (0.5 mm) of the wall thickness O of the mating groove 23 can ensure the minimum structural strength of the mating groove 23, preventing deformation during assembly or cracking after long-term use due to too thin wall thickness; for example, when O < 0.5 mm, the mating groove 23 may undergo plastic deformation due to the insertion force of the mating member 13 or external impact, resulting in positioning failure. On the other hand, the upper limit (2.5 mm) of the wall thickness O of the mating groove 23 can limit the wall thickness of the mating groove 23 to control the amount of plastic material used, avoiding increasing the manufacturing cost or causing interference in the assembly path due to too thick wall thickness.

[0102] In this way, the reasonable range of the wall thickness O ensures the stability of the mating groove 23 when bearing the insertion force, vibration or impact of the mating member 13, and at the same time can avoid interference between the mating groove 23 and other components. In addition, since the bottom wall of the mating groove 23 does not extend beyond the outer surface of the second plate member 2, the assembly between the second plate member 2 and the cover plate body 3 can be ensured without interference.

[0103] According to some embodiments of the present utility model, the gap between the mating member 13 and the mating groove 23 in the width direction is P, and its value range is 0.05 mm < P ≤ 1 mm; the gap between the mating member 13 and the mating groove 23 in the direction perpendicular to the cover plate body 3 is Q, and its value range is 0 ≤ Q ≤ 3 mm.

[0104] In this embodiment, the width direction gap P is defined as the tolerance gap between the mating member 13 and the mating groove 23 in the width direction, and the value range is 0.05 mm < P ≤ 1 mm; for example, if the width Z of the mating member 13 = 10 mm and the width of the mating groove 23 is 10.5 mm, then P = 0.5 mm.

[0105] The vertical clearance Q is defined as the tolerance clearance between the mating part 13 and the mating groove 23 in the direction perpendicular to the cover plate body 3 (i.e., the height or thickness direction), and the value range is 0≤Q≤3mm; for example, if the thickness of the mating part 13 is X=2mm and the depth of the mating groove 23 is 2.5mm, then Q=0.5mm.

[0106] The lower limit of the width-direction clearance P (>0.05mm) can prevent assembly difficulties or material deformation due to excessively small clearance. For example, when P≤0.05mm, the mating part 13 may not be able to be smoothly inserted into the mating groove 23 due to slight tolerance deviation, or the plastic material may crack due to excessive compression. The upper limit of the width-direction clearance P (≤1mm) ensures the positioning accuracy of the mating part 13 and the mating groove 23 in the width direction, preventing lateral swaying or positioning failure due to excessive clearance.

[0107] The lower limit (0mm) of the vertical clearance Q allows for complete vertical contact between the mating part 13 and the mating groove 23. For example, when Q = 0, the thickness X of the mating part 13 perfectly matches the depth of the mating groove 23. Combined with the wall thickness O (0.5~2.5mm) of the mating groove 23 given in the above embodiment, a zero-clearance seal can be achieved. At this time, the vertical contact surfaces of the mating part 13 and the mating groove 23 are completely in contact, enhancing sealing and insulation. The upper limit (≤3mm) of the vertical clearance Q can limit the maximum permissible tolerance in the vertical direction, avoiding seal failure or structural strength reduction due to excessive clearance.

[0108] In summary, the range of values ​​for P ensures the precise positioning of the mating part 13 in the width direction while allowing reasonable tolerances to avoid assembly jamming; the range of values ​​for Q balances perfect fit (Q=0) and tolerance tolerance (Q≤3mm). For example, when Q=0, the mating part 13 and the mating groove 23 form a full contact seal; while when Q=3mm, structural stability can still be ensured by the secondary constraints of the positioning part 14 and the positioning groove 24.

[0109] like Figure 4 and Figure 10 As shown, according to some embodiments of the present invention, the surface of the first step portion 12 is flush with the surface of the mating part 13.

[0110] like Figures 1 to 12 As shown, in a specific embodiment of this utility model, the battery cell cover assembly mainly includes a lower plastic structure, a cover body 3, an electrode post, a sealing element, and an explosion-proof valve.

[0111] The cover plate body 3 is used to seal the top of the battery cell, protecting the internal electrodes and electrolyte. The cover plate body 3 fits tightly with the lower plastic structure to ensure the overall sealing of the battery cell. The first plate 1 has a first terminal hole 11, and the second plate 2 has a second terminal hole 21. The terminals (positive and negative terminals) are electrically connected to the external circuit through the terminal holes (first terminal hole 11 and second terminal hole 21) in the lower plastic structure. The design of the mating part 13 and the mating groove 23 ensures the structural stability of the lower plastic structure and prevents poor contact or short circuits caused by the shaking of the lower plastic. The sealing part (such as O-rings or sealant) is used to enhance the sealing between the battery cell cover plate assembly and the battery cell housing, preventing electrolyte leakage or external moisture intrusion. An explosion-proof valve is installed on the cover plate body 3 and is positioned opposite to the groove formed by the first step part 12 and the second step part 22. It is used to automatically open and release pressure when the internal pressure of the battery rises abnormally, protecting the battery safety.

[0112] like Figures 1 to 12 As shown, the battery cell according to the second aspect embodiment of the present invention includes the battery cell cover plate assembly as shown in the first aspect embodiment of the present invention.

[0113] 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, It includes a cover plate body (3) and a lower plastic structure; the lower plastic structure is attached to the side of the cover plate body (3) facing the battery cell; The lower plastic structure includes a first plate (1) and a second plate (2) connected to each other. The first plate (1) has a first step (12) at one end facing the second plate (2), and the second plate (2) has a second step (22) at one end facing the first plate (1). The first step (12) is provided with a mating part (13) extending toward the second plate (2), and the second step (22) is provided with a mating groove (23), the mating part (13) being shaped to fit into the mating groove (23).

2. The cell cover assembly according to claim 1, characterized in that, The mating groove (23) is closed on one side adjacent to the cover plate body (3), and the mating groove (23) is open on the other side away from the cover plate body (3).

3. The cell cover assembly according to claim 2, characterized in that, The number of the mating parts (13) is one and the number of the mating grooves (23) is also one. The mating parts (13) are located at the middle position along the width direction of the first step portion (12), and correspondingly, the mating grooves (23) are also located at the middle position along the width direction of the second step portion (22). Alternatively, the number of mating parts (13) is at least two and the number of mating grooves (23) is also at least two. The mating parts (13) are spaced apart along the width direction of the first step portion (12), and the mating grooves (23) are spaced apart along the width direction of the second step portion (22). The mating parts (13) and the mating grooves (23) correspond one-to-one.

4. The cell cover assembly according to claim 2, characterized in that, The mating part (13) has a protruding positioning part (14) on one side surface facing the bottom wall of the mating groove (23). Correspondingly, the bottom wall of the mating groove (23) has a recessed positioning groove (24), and the positioning part (14) fits into the positioning groove (24).

5. The cell cover assembly according to claim 4, characterized in that, The positioning element (14) extends along the length direction of the first plate (1), and correspondingly, the positioning groove (24) extends along the length direction of the second plate (2).

6. The cell cover assembly according to claim 4, characterized in that, The sum of the height of the positioning element (14) and the thickness of the mating element (13) is H, and its value ranges from 2m to H to 7mm.

7. The cell cover assembly according to any one of claims 1 to 6, characterized in that, The thickness of the mating part (13) is X, and its value range is: 0.5mm≤X≤2.5mm; the length of the mating part (13) is Y and its length is Z, and their value ranges are respectively: 3mm≤Y≤25mm and 5mm≤Z≤15mm.

8. The cell cover assembly according to any one of claims 1 to 6, characterized in that, The wall thickness of the mating groove (23) is O, and its value range is: 0.5mm≤O≤2.5mm; and the bottom wall of the mating groove (23) does not extend beyond the surface of the second plate (2) facing the cover plate body (3).

9. The cell cover assembly according to any one of claims 1 to 6, characterized in that, The gap between the mating part (13) and the mating groove (23) in the width direction is P, and its value range is 0.05mm < P ≤ 1mm; the gap between the mating part (13) and the mating groove (23) in the direction perpendicular to the cover plate body (3) is Q, and its value range is 0 ≤ Q ≤ 3mm.

10. A battery cell, characterized in that, Includes the cell cover assembly as described in any one of claims 1 to 9.

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