Cover plate assembly and battery cell

Abstract

The utility model relates to battery technical field discloses the cover plate subassembly and electric core. Cover plate subassembly includes: cover plate body, is provided with a plurality of structure holes on the cover plate body, a plurality of reinforcing structures are spaced apart each other and set up on the cover plate body, the interval between two adjacent reinforcing structures is x, the interval between reinforcing structure and structure hole is y, wherein, x is greater than or equal to 3mm, y is greater than or equal to 3mm, reinforcing structure includes first reinforcing structure and second reinforcing structure, first reinforcing structure sets up between the edge of cover plate body and structure hole, second reinforcing structure sets up on the side of the edge of first reinforcing structure away from cover plate body, and at least part of second reinforcing structure is located between two adjacent structure holes. Strengthen weak area on the cover plate body, realize light weight, reduce material cost, and the adjacent two reinforcing structures and the adjacent reinforcing structure and structure hole all have enough interval, avoid material flow area overlapping when stamping forming, avoid stress concentration.

Description

Technical Field

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

[0002] Batteries are widely used in electric vehicles, energy storage, and other fields, making battery safety paramount. A battery cell mainly consists of a casing, a cover assembly, and electrode assemblies. The cover assembly covers the opening of the casing, while the electrode assemblies are located inside the casing. The cover assembly is a crucial component of the battery cell. During use, battery cells are often exposed to bumpy and vibrating environments, subjecting the cover assembly to significant shear force impacts. If the cover assembly itself is not strong enough, weak areas on the cover assembly will break and fail. Currently, most cover assemblies are flat, resulting in poor structural strength. To improve the structural strength of the cover assembly, a common approach is to increase its thickness. However, increasing the thickness of the cover assembly simultaneously increases the material cost and weight of the cover assembly, leading to a higher cost and weight for the battery cell. Utility Model Content

[0003] In view of this, the present invention provides a cover plate assembly and a battery cell to solve the problems of poor structural strength, high material cost, and heavy weight of the cover plate body.

[0004] In a first aspect, the present invention provides a cover plate assembly, comprising: a cover plate body having a plurality of structural holes; a plurality of reinforcing structures disposed at intervals on the cover plate body, wherein the distance between two adjacent reinforcing structures is x, and the distance between a reinforcing structure and a structural hole is y, wherein x ≥ 3 mm and y ≥ 3 mm; the reinforcing structure includes a first reinforcing structure and a second reinforcing structure, wherein the first reinforcing structure is disposed between the edge of the cover plate body and the structural holes, and the second reinforcing structure is disposed on the side of the first reinforcing structure opposite to the edge of the cover plate body, and at least a portion of the second reinforcing structure is located between two adjacent structural holes.

[0005] Beneficial effects: By setting reinforcing structures on the cover plate body, the first reinforcing structure located between the edge of the cover plate body and the structural hole can enhance the structural strength near the edge of the cover plate body. The second reinforcing structure, at least partially located between two adjacent structural holes, can locally reinforce the area between the two structural holes. Thus, the weak areas on the cover plate body can be reinforced without increasing the thickness of the cover plate body, achieving weight reduction and reducing material costs. Furthermore, by setting the spacing between two adjacent reinforcing structures, any two reinforcing structures are prevented from being adjacent or intersecting. At the same time, by limiting the distance x between two adjacent reinforcing structures to be greater than or equal to 3 mm, and the distance y between the reinforcing structure and the structural hole to be greater than or equal to 3 mm, there is sufficient spacing between two adjacent reinforcing structures and between adjacent reinforcing structures and structural holes. This avoids the overlap of material flow areas during stamping, thereby avoiding stress concentration, reducing cracking, and improving product molding yield.

[0006] In one optional embodiment, a plurality of the structural holes are spaced apart along a first direction, and the first reinforcing structure includes two first reinforcing ribs that extend along the first direction and are spaced apart along a second direction.

[0007] Beneficial effects: By setting two first reinforcing ribs on the cover plate body, and the extension direction of the first reinforcing ribs is in the same direction as the arrangement direction of several structural holes, the layout of the first reinforcing structure is facilitated, and the structural strength of the cover plate body can be effectively increased.

[0008] In one alternative embodiment, the second reinforcing structure includes a second reinforcing rib located between two adjacent structural holes, the second reinforcing rib being annular.

[0009] Beneficial effects: By setting a second reinforcing rib between two adjacent structural holes, the weak stress area between the two adjacent structural holes is locally reinforced. The second reinforcing rib provides a certain support to the area between adjacent structural holes, preventing the structural holes from deforming or breaking when subjected to external forces, thereby further strengthening the structural strength of the cover plate body. In addition, the annular second reinforcing rib can make the reinforcement effect more uniform and improve the overall strength of the cover plate assembly.

[0010] In one optional embodiment, the second reinforcing rib is a square ring with an inner width of a, where a ≥ 6 mm; or, the second reinforcing rib is a circular ring or an elliptical ring.

[0011] Beneficial effects: By limiting the ring shape of the second reinforcing rib to a square ring, it is easier to process and shape the second reinforcing rib and control its size and shape. Furthermore, by limiting the inner width a of the square ring to be greater than or equal to 6 mm, it is possible to ensure the smooth processing and shaping of the square ring, avoid cracking at the corners of the square ring, ensure processing quality, and ensure that the second reinforcing rib has sufficient size, thereby ensuring the reinforcing effect of the second reinforcing rib on the cover plate body. Alternatively, the circular or elliptical ring structure is simple and easy to process and shape, further ensuring the reinforcing effect of the second reinforcing rib on the structural strength of the cover plate body.

[0012] In one optional embodiment, the second reinforcing structure further includes a third reinforcing rib, which is spaced apart from the second reinforcing rib along the first direction, and at least one structural hole is present between the third reinforcing rib and the second reinforcing rib.

[0013] Beneficial effects: By setting a third reinforcing rib on the cover plate body, and the third reinforcing rib and the second reinforcing rib are spaced apart along the first direction, with at least one structural hole between the third reinforcing rib and the second reinforcing rib, and the third reinforcing rib being located in the area between the two structural holes and the first reinforcing rib, the structural strength of this area can be strengthened, thereby further improving the structural strength of the cover plate body and the supporting effect on the structural holes, reducing the deformation risk of various areas of the cover plate body, and improving reliability.

[0014] In one alternative embodiment, the third reinforcing rib is elongated and extends along the first direction; or, the third reinforcing rib is zigzag-shaped.

[0015] Beneficial effects: By setting the third reinforcing rib to be an elongated strip extending along the first direction, the structure is simple, easy to process and form, and has a good reinforcing effect; or, by setting the third reinforcing rib to be a zigzag shape, the contact area between the third reinforcing rib and the cover plate body can be further increased, improving the connection strength. At the same time, the zigzag-shaped third reinforcing rib can adapt to forces in different directions, enhance the deformation resistance of the cover plate body, and also provide a certain support for adjacent structural holes, preventing the structural holes from deforming or breaking when subjected to external forces.

[0016] In one alternative embodiment, the reinforcing structure forms a groove on one side of the cover plate body in the thickness direction and a rib on the other side, the rib being disposed corresponding to the groove.

[0017] Beneficial effects: By setting a groove on one side of the cover plate body along its thickness direction and a corresponding rib on the other side, the groove and rib together form a reinforcing structure, which facilitates the stamping and forming of the reinforcing structure. The corresponding form of the rib and groove forms a reinforcing structure, which can not only strengthen the structural strength of the cover plate body, but also avoid adding extra weight to the cover plate body, thereby achieving lightweighting.

[0018] In one alternative embodiment, the distance between the edge of the cover plate body and the first reinforcing structure along the second direction is e, where 0.5 mm ≤ e ≤ 30 mm.

[0019] Beneficial effects: Ensuring a reasonable distance between the edge of the cover plate body and the first reinforcing structure can prevent the welding laser from scanning the protruding ribs or grooves during the welding of the cover, thereby ensuring the welding strength between the shell and the cover plate body and ensuring the welding yield of the cover. It can also ensure the strengthening effect of the first reinforcing structure on the structural strength of the edge area of ​​the cover plate body, thereby improving the reliability of the cover plate assembly and the safety of the cover after welding.

[0020] Secondly, this utility model also provides a battery cell, comprising: a housing having an open end; an electrode assembly disposed within the inner cavity of the housing; and the aforementioned cover plate assembly covering the open end of the housing. Since the battery cell includes the cover plate assembly and has the same effect as the cover plate assembly, it will not be described in detail here.

[0021] In one alternative embodiment, the first reinforcing structure forms a rib on the side of the cover plate body facing the inner cavity of the housing, and the distance between the rib and the inner wall of the housing along the second direction is g, wherein 0.2 mm ≤ g ≤ 30 mm.

[0022] Beneficial effects: It can ensure smooth assembly of the cover plate assembly and the housing, and also ensure that the first reinforcing structure has a sufficient reinforcing effect on the edge of the cover plate body, thereby ensuring the reliability of the assembled battery cell. Attached Figure Description

[0023] 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.

[0024] Figure 1 This is a schematic diagram of the structure of a cover plate assembly according to an embodiment of the present utility model; Figure 2 for Figure 1A structural schematic diagram of the cover plate assembly from the bottom view; Figure 3 for Figure 1 The top view of the cover assembly shown from the bottom; Figure 4 for Figure 3 A cross-sectional view along the AA direction; Figure 5 for Figure 3 Cross-sectional view along the BB direction; Figure 6 for Figure 1 The front view of the cover plate assembly shown; Figure 7 This is a partially enlarged cross-sectional view of a cover plate assembly and a housing after assembly according to an embodiment of the present utility model. Figure 8 This is a partially enlarged schematic diagram of a cross-sectional view of another embodiment of the present invention, showing the cover plate assembly assembled with the housing.

[0025] Explanation of reference numerals in the attached figures: 1. Cover plate body; 110. Structural hole; 111. Pole post hole; 112. Explosion-proof hole; 113. Liquid injection hole; 201. Groove; 202. Rib; 210. First reinforcing structure; 220. Second reinforcing structure; 221. Second reinforcing rib; 222. Third reinforcing rib; 3. Shell; 4. Pole post; 5. Explosion-proof valve. Detailed Implementation

[0026] 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.

[0027] Lithium-ion batteries are a commonly used type of battery. With the increasing maturity of lithium-ion battery technology, they are widely used as power batteries in electric vehicles and energy storage, leading to increasingly stringent requirements for performance and safety. The battery in this technology includes components such as the casing, cover assembly, and electrode assembly. The cover assembly and casing are welded and sealed to encapsulate the electrode assembly internally, while a plastic sheet (PP material) holds the electrode assembly in place. After being packaged in a vehicle, the battery is subjected to prolonged vibrations and bumps, which can cause significant shearing forces on the cover area. Insufficient strength of the cover itself can lead to damage and failure in weak areas such as the explosion-proof valve and the welded joints of the casing. Therefore, the cover needs a certain level of structural strength.

[0028] The cover plates in related technologies are flat and have poor structural strength. Their strength is typically improved by increasing the thickness of the cover plate, but this also increases the material cost of the cover plate and the weight of the battery cell. In other words, the cover plate assemblies in related technologies suffer from poor structural strength, high material costs, and significant weight.

[0029] The following is combined Figures 1 to 8 The following describes embodiments of the present invention.

[0030] According to an embodiment of the present invention, a cover plate assembly is provided, comprising: a cover plate body 1 and a plurality of reinforcing structures. The cover plate body 1 is provided with a plurality of structural holes 110; the plurality of reinforcing structures are disposed on the cover plate body 1 at intervals, the distance between two adjacent reinforcing structures being x (e.g., ...). Figure 4 As shown), the distance between the reinforcing structure and the structural hole 110 is y (as shown). Figure 7 As shown), where x≥3 mm, y≥3 mm; the reinforcing structure includes a first reinforcing structure 210 and a second reinforcing structure 220. The first reinforcing structure 210 is disposed between the edge of the cover plate body 1 and the structural hole 110. The second reinforcing structure 220 is disposed on the side of the first reinforcing structure 210 away from the edge of the cover plate body 1, and at least a portion of the second reinforcing structure 220 is located between two adjacent structural holes 110.

[0031] It should be noted that the edge of the cover plate body 1 refers to at least one side of the circumferential edge of the cover plate body 1; the structural hole 110 is a through hole formed on the cover plate body 1, penetrating the cover plate body 1 along its thickness direction, wherein the thickness direction refers to... Figures 4 to 6 The "thickness direction" indicated by the middle arrow indicates that the structural hole 110 is suitable for installing components in the cover plate assembly. Specifically, the structural hole 110 includes a pole hole 111, an explosion-proof hole 112, and an injection hole 113. The pole hole 111 is suitable for installing a pole 4, the explosion-proof hole 112 is suitable for installing an explosion-proof valve 5, and the injection hole 113 is used to inject electrolyte into the cell. The injection hole 113 is suitable for installing a sealing pin to close the injection hole 113 when electrolyte injection is not required.

[0032] It should be noted that, on a plane perpendicular to the thickness direction of the cover plate body, the cover plate body 1 has intersecting first and second directions, preferably, the first and second directions are perpendicular; specifically, the first direction refers to... Figures 1 to 3 and Figure 6 The middle arrow points to the "first direction"; the second direction refers to... Figures 1 to 5 and Figures 7 to 8 The middle arrow points to the "second direction"; the thickness direction refers to... Figures 4 to 8The "thickness direction" indicated by the middle arrow; the distance x between two adjacent reinforcing structures refers to the distance between two adjacent reinforcing structures along the first or second direction, and the distance y between a reinforcing structure and a structural hole 110 refers to the distance between any one reinforcing structure and a structural hole 110 along the first or second direction; the reinforcing structures and structural holes 110 on the cover plate body 1 are formed by stamping. If the distance x between two adjacent reinforcing structures is less than 3 mm, or the distance y between a reinforcing structure and a structural hole 110 is less than 3 mm, the material flow area will highly overlap during stamping, resulting in stress concentration, easy cracking, and a low forming yield.

[0033] By applying the cover plate assembly of this embodiment, a first reinforcing structure 210 located between the edge of the cover plate body 1 and the structural hole 110 can strengthen the structural strength near the edge of the cover plate body 1, and a second reinforcing structure 220 located at least partially between two adjacent structural holes 110 can locally strengthen the area between the two structural holes 110. Thus, the weak areas on the cover plate body 1 can be strengthened without increasing the thickness of the cover plate body 1, achieving weight reduction and reducing material costs. Furthermore, by setting an interval between two adjacent reinforcing structures, any two reinforcing structures are prevented from being adjacent or intersecting. At the same time, by limiting the distance x between two adjacent reinforcing structures to be greater than or equal to 3 mm, and the distance y between the reinforcing structure and the structural hole 110 to be greater than or equal to 3 mm, there is sufficient spacing between two adjacent reinforcing structures and between adjacent reinforcing structures and the structural hole 110, avoiding the overlap of material flow areas during stamping, thereby avoiding stress concentration, reducing cracking, and improving product molding yield.

[0034] In one embodiment, a plurality of structural holes 110 are spaced apart along a first direction, and the first reinforcing structure 210 includes two first reinforcing ribs extending along the first direction and spaced apart along a second direction. It should be noted that the cover plate body 1 has two first side edges arranged opposite each other along the second direction and two second side edges arranged opposite each other along the first direction. The dimension of the cover plate body 1 along the first direction is larger than its dimension along the second direction. The first reinforcing ribs are strip-shaped, and each first reinforcing rib is adjacent to one of the first side edges. Preferably, the orthographic projection of all structural holes 110 along the second direction onto the first reinforcing ribs is within the range of the first reinforcing ribs. By providing two first reinforcing ribs on the cover plate body 1, and the extending direction of the first reinforcing ribs being in the same direction as the arrangement direction of the plurality of structural holes 110, the layout of the first reinforcing structure 210 is facilitated, and the structural strength of the cover plate body 1 can be effectively increased.

[0035] In other embodiments, the first reinforcing structure 210 includes four first reinforcing ribs, two of which extend along a first direction and two of which are spaced apart along a second direction, and the other two extend along the second direction and are spaced apart along the first direction. Each of the four reinforcing ribs corresponds to one side of the cover plate body 1, further improving the structural strength of the cover plate body 1.

[0036] In one embodiment, the second reinforcing structure 220 includes a second reinforcing rib 221, which is located between two adjacent structural holes 110 and is annular in shape. It should be noted that the opening of the structural holes 110 creates localized weak points on the cover plate body 1. By providing the second reinforcing rib 221 between two adjacent structural holes 110, the weak points between them are locally reinforced. The second reinforcing rib 221 provides support to the area between adjacent structural holes 110, preventing deformation or damage to the structural holes 110 under external forces, thereby further strengthening the structural strength of the cover plate body 1. Furthermore, the annular second reinforcing rib 221 ensures a more uniform reinforcement effect and improves the overall strength of the cover plate assembly.

[0037] Optionally, the second reinforcing rib 221 is disposed between the pole post hole 111 and the explosion-proof hole 112 to locally reinforce the structurally weak area between the pole post 4 and the explosion-proof valve 5.

[0038] In one embodiment, the second reinforcing rib 221 forms a square ring, with an inner width of 'a', where a ≥ 6 mm. It should be noted that two sides of the square ring are parallel to the first direction and the other two sides are parallel to the second direction. The inner width 'a' of the square ring refers to the smaller value of the inner ring's dimensions along the first and second directions. Further... Figure 3 As shown, in this embodiment, the inner width of the square ring along the first direction is smaller than its inner width along the second direction, where 'a' is the inner width of the square ring along the first direction. If 'a' is less than 6 mm, the inner ring size of the square ring is too small to be processed and formed, and cracks will occur at the corners of the square ring, thereby compromising the structural strength of the cover plate body 1 and failing to provide reinforcement. Therefore, by limiting the ring formed by the second reinforcing rib 221 to a square ring, it is easier to process and form the second reinforcing rib 221 and control its size and shape. Furthermore, by limiting the inner width 'a' of the square ring to be greater than or equal to 6 mm, it is possible to ensure the smooth processing and forming of the square ring, avoid cracking at the corners of the square ring, ensure processing quality, and ensure that the second reinforcing rib 221 has sufficient size, thereby ensuring the reinforcement effect of the second reinforcing rib 221 on the cover plate body 1.

[0039] In other embodiments, the ring-shaped second reinforcing rib 221 can also be a circular ring, an elliptical ring, etc. Circular or elliptical rings have simple structures and are easy to process and form, further ensuring the reinforcing effect of the second reinforcing rib 221 on the structural strength of the cover plate body 1. Of course, the ring-shaped second reinforcing rib 221 can also be a polygonal ring other than a square ring, as long as the second reinforcing rib 221 can form a closed loop on the surface of the cover plate body 1.

[0040] In one embodiment, the second reinforcing structure 220 further includes a third reinforcing rib 222, which is spaced apart from the second reinforcing rib 221 along the first direction, and at least one structural hole 110 is provided between the third reinforcing rib 222 and the second reinforcing rib 221. It should be noted that the third reinforcing rib 222 is spaced apart from the second reinforcing rib 221 along the first direction, and at least one structural hole 110 is provided between the third reinforcing rib 222 and the second reinforcing rib 221. The third reinforcing rib 222 is located in the region between the two structural holes 110 and the first reinforcing rib, thereby increasing the structural strength of that region. By providing a third reinforcing rib 222 on the cover plate body 1, and the third reinforcing rib 222 and the second reinforcing rib 221 being spaced apart along the first direction, with at least one structural hole 110 between the third reinforcing rib 222 and the second reinforcing rib 221, and the third reinforcing rib 222 being located in the area between the two structural holes 110 and the first reinforcing rib, the structural strength of this area can be strengthened, thereby further improving the structural strength of the cover plate body 1 and the supporting effect on the structural holes 110, reducing the deformation risk of various areas of the cover plate body 1, and improving reliability.

[0041] It should be noted that the third reinforcing rib 222 is arranged parallel to the first reinforcing rib, and the dimension of the third reinforcing rib 222 along the first direction is smaller than the dimension of the first reinforcing rib along the first direction. The number of third reinforcing ribs 222 is one or more. The extension line of the third reinforcing rib 222 may pass through at least one of the structural holes 110, or it may not pass through the structural hole 110.

[0042] Optionally, the cover plate body 1 has two pole holes 111, and an explosion-proof hole 112 is provided between the two pole holes 111. A second reinforcing rib 221 is provided between one pole hole 111 and the explosion-proof hole 112, and a third reinforcing rib 222 is provided in the area corresponding to the other pole hole 111 and the explosion-proof hole 112. It should be noted that an injection hole 113 is also provided between the other pole hole 111 and the explosion-proof hole 112, and it must be ensured that the third reinforcing rib 222 and the injection hole 113 are also spaced apart.

[0043] In one embodiment, further combination Figures 1 to 3As shown, the third reinforcing rib 222 is elongated and extends along the first direction. By making the third reinforcing rib 222 elongated along the first direction, the structure is simple, easy to process and shape, and provides good reinforcement. Preferably, the length of the third reinforcing rib 222 along the first direction is less than the distance along the first direction between the pole post hole 111 and the explosion-proof hole 112, ensuring the reinforcement effect of the third reinforcing rib 222 on the area between the pole post hole 111 and the explosion-proof hole 112.

[0044] In other embodiments, the third reinforcing rib 222 can also be zigzag-shaped. By setting the third reinforcing rib 222 to a zigzag shape, the contact area between the third reinforcing rib 222 and the cover plate body 1 can be further increased, improving the connection strength. At the same time, the zigzag-shaped third reinforcing rib 222 can adapt to forces in different directions, enhancing the deformation resistance of the cover plate body 1, and also providing a certain support for adjacent structural holes 110, preventing the structural holes 110 from deforming or breaking when subjected to external forces. Optionally, the zigzag shape can be an "L", "Z", "M", or other shapes.

[0045] In other embodiments, the second reinforcing structure 220 may also include only one reinforcing rib, which may be arranged in an "M" shape or other zigzag pattern in the area between the structural holes 110 and in the area outside the structural holes 110.

[0046] In one embodiment, the reinforcing structure forms a groove 201 on one side of the cover plate body 1 along its thickness direction and a rib 202 on the other side, with the rib 202 corresponding to the groove 201. The groove 201 and the rib 202 are stamped simultaneously. By forming a groove 201 on one side of the cover plate body along its thickness direction and a corresponding rib 202 on the other side, the groove 201 and the rib 202 together form a reinforcing structure, which facilitates the stamping of the reinforcing structure. The corresponding form of the rib 202 and the groove 201 forms a reinforcing structure, which can both strengthen the structural strength of the cover plate body 1 and avoid adding extra weight to the cover plate body 1, thereby achieving lightweighting.

[0047] In one embodiment, on a cross section perpendicular to the extension direction of the reinforcing structure, the cross sections of the rib 202 and the groove 201 are both semi-circular, which facilitates stamping, makes them easy to form, and results in a high processing yield.

[0048] In one embodiment, further combination Figure 8As shown, the distance between the edge of the cover body 1 and the first reinforcing structure 210 along the second direction is e, where 0.5 mm ≤ e ≤ 30 mm. It should be noted that the edge of the cover body 1 is welded to the shell 3 by laser welding. e is the distance between the edge of the cover body 1 and the first reinforcing rib. When the first reinforcing rib extends along the first direction, e is the distance between the first side of the cover body 1 and the first reinforcing rib along the second direction. If e is less than 0.5 mm, the distance between the edge of the cover body 1 and the reinforcing structure is too small, which will affect the shell-cover welding. The welding laser scanning the area of ​​the protruding rib 202 or the groove 201 will cause welding spalls, reducing the welding strength. If e is greater than 30 mm, the distance between the edge of the cover body 1 and the reinforcing structure is too large, and the reinforcing structure's effect on the structural reinforcement of the part of the cover body 1 near the edge (i.e., the shell-cover assembly welding area) is not significant. Therefore, by limiting e to a value between 0.5 mm and 30 mm, a reasonable distance is ensured between the edge of the cover body 1 and the first reinforcing structure 210. This can prevent the welding laser from scanning the protruding rib 202 or the groove 201 during the welding of the cover, thereby ensuring the welding strength between the shell 3 and the cover body 1 and ensuring the welding yield of the cover. It can also ensure the strengthening effect of the first reinforcing structure 210 on the structural strength of the edge area of ​​the cover body 1, thereby improving the reliability of the cover assembly and the safety of the cover after welding.

[0049] Optionally, the value of e is any value among 0.5 mm, 1 mm, 3 mm, 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, and 30 mm, or a value between any two values.

[0050] According to an embodiment of the present invention, another aspect provides a battery cell, comprising: a housing 3, an electrode assembly, and the aforementioned cover plate assembly. The housing 3 has an open end; the electrode assembly is disposed within the inner cavity of the housing 3; the cover plate assembly covers the open end of the housing 3. The electrode assembly has tabs, which are electrically connected to the terminals 4 in the cover plate assembly.

[0051] In one embodiment, further combination Figure 7As shown, the first reinforcing structure 210 forms a rib 202 on the side of the cover plate body 1 facing the inner cavity of the housing 3. The distance between the rib 202 and the inner wall of the housing 3 along the second direction is g, where 0.2 mm ≤ g ≤ 30 mm. It should be noted that the rib 202 and the groove 201 are located on opposite surfaces of the cover plate body 1. When the rib 202 is located on the side of the cover plate body 1 facing the inner cavity of the housing 3, the groove 201 is located on the side of the cover plate body 1 facing the outer side of the housing. After the cover plate assembly is assembled with the housing 3, the rib 202 extends into the inner cavity of the housing 3. When the first reinforcing rib extends along the first direction, g refers to the distance between the rib 202 of the first reinforcing rib and the inner wall of the housing 3 along the second direction. If g is less than 0.2 mm, the distance between the rib 202 and the inner wall of the housing 3 is too small. During the assembly of the cover plate assembly and the housing 3, the rib 202 may rub against the inner wall of the housing 3, affecting the assembly accuracy and effect of the cover assembly, leading to assembly difficulties. If g is greater than 30 mm, the distance between the rib 202 and the inner wall of the housing 3 is too large, and the reinforcement effect of the first reinforcing structure 210 on the edge of the cover plate body 1 is not obvious, affecting the overall structural strength of the battery cell. Therefore, by limiting the distance g between the rib 202 and the inner wall of the housing 3 to between 0.2 mm and 30 mm, it is possible to ensure smooth assembly of the cover plate assembly and the housing 3, and also to ensure that the first reinforcing structure 210 has sufficient reinforcing effect on the edge of the cover plate body 1, thereby ensuring the reliability of the assembled battery cell.

[0052] Optionally, the value of g is any value among 0.2 mm, 0.5 mm, 1 mm, 3 mm, 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, and 30 mm, or a value between any two of these values.

[0053] In other embodiments, the groove 201 may be located on the side of the cover plate body 1 facing the inner cavity of the housing 3, and the rib 202 may be located on the side of the cover plate body 1 facing the outer side of the housing.

[0054] Optionally, the battery cell is a lithium-ion battery cell.

[0055] In this embodiment, the battery cell strengthens the structure of the cover plate body 1 by constructing a reinforcing structure on the cover plate body 1, thereby achieving an appropriate reduction in the thickness of the cover plate body 1, achieving weight reduction, and reducing material costs; at the same time, it can also locally strengthen the structurally weak areas such as the explosion-proof valve 5, the pole post 4, and the shell cover weld.

[0056] 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 cover plate assembly, characterized in that, include: The cover plate body has a plurality of structural holes. Several reinforcing structures are arranged at intervals on the cover plate body, the distance between two adjacent reinforcing structures is x, and the distance between the reinforcing structure and the structural hole is y, where x≥3 mm and y≥3 mm; The reinforcing structure includes a first reinforcing structure and a second reinforcing structure. The first reinforcing structure is disposed between the edge of the cover plate body and the structural hole. The second reinforcing structure is disposed on the side of the first reinforcing structure opposite to the edge of the cover plate body, and at least a portion of the second reinforcing structure is located between two adjacent structural holes.

2. The cover plate assembly according to claim 1, characterized in that, A plurality of the structural holes are spaced apart along a first direction, and the first reinforcing structure includes two first reinforcing ribs, which extend along the first direction and are spaced apart along a second direction.

3. The cover plate assembly according to claim 2, characterized in that, The second reinforcing structure includes a second reinforcing rib, which is located between two adjacent structural holes and is annular in shape.

4. The cover plate assembly according to claim 3, characterized in that, The second reinforcing rib forms a square ring, and the inner width of the square ring is a, where a ≥ 6 mm; Alternatively, the ring formed by the second reinforcing rib can be a circular ring or an elliptical ring.

5. The cover plate assembly according to claim 3, characterized in that, The second reinforcing structure further includes a third reinforcing rib, which is spaced apart from the second reinforcing rib along the first direction, and there is at least one structural hole between the third reinforcing rib and the second reinforcing rib.

6. The cover plate assembly according to claim 5, characterized in that, The third reinforcing rib is elongated and extends along the first direction; or, the third reinforcing rib is zigzag-shaped.

7. The cover plate assembly according to any one of claims 1 to 6, characterized in that, The reinforcing structure forms a groove on one side of the cover plate body in the thickness direction and a rib on the other side, with the rib corresponding to the groove.

8. The cover plate assembly according to claim 7, characterized in that, The distance between the edge of the cover plate body and the first reinforcing structure along the second direction is e, where 0.5 mm ≤ e ≤ 30 mm.

9. A battery cell, characterized in that, include: The shell has an open end; The electrode assembly is disposed within the inner cavity of the housing; The cover plate assembly according to any one of claims 1 to 8 is disposed over the opening end of the housing.

10. The battery cell according to claim 9, characterized in that, The first reinforcing structure forms a rib on the side of the cover plate body facing the inner cavity of the housing, and the distance between the rib and the inner wall of the housing along the second direction is g, wherein 0.2 mm ≤ g ≤ 30 mm.

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