Top cover structure, battery cell and battery module

Abstract

The invention relates to the technical field of energy storage devices, in particular to a top cover structure, a battery cell and a battery module, the top cover structure comprises a cover plate and a first plastic part, the first plastic part is attached to the side, facing the interior of a battery, of the cover plate, the cover plate is provided with a first positioning structure, and the first plastic part is provided with a pole through hole and a second positioning structure; the first positioning structure and the second positioning structure are matched in a concave-convex mode so as to limit the relative position of the first plastic part and the cover plate. The second positioning structure comprises M groups of positioning parts, one group of positioning parts is arranged at an interval of a preset length W from the center of the pole through hole in the length direction of the first plastic part, and the preset length W meets # imgabs0 #, and M is a positive integer. The battery cell comprises a shell and the top cover structure, and the top cover structure is arranged at the opening of the shell in a sealing manner to form a battery cell shell. The battery module comprises a battery shell and at least one battery cell, wherein the at least one battery cell is arranged in the battery shell.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage devices, and in particular to a top cover structure, a battery cell and a battery module. Background Art

[0002] Existing blade cells generally adopt a structural design with pole ears on both sides, so the positive pole and negative pole are respectively arranged on the cover plates at both ends. The lower plastic at the pole position is fixed by the pressing of the pole, and there will be no movement or deviation of the lower plastic at this position. However, there is no additional limiting structure on the other side of the lower plastic away from the pole, or the limiting structure is designed unreasonably, causing the plastic under the cover plate to often be skewed, the center lines at both ends not to coincide, and the lower plastic to deform and shift. During the use of the battery cell, there will be problems such as poor hot-melt insulation film, scratches on the cover plate or pole group when entering the shell, torn pole ears, abnormal peripheral welding and helium inspection, which have a great impact on the yield and efficiency of the battery cell process. At the same time, the battery cell also has a large potential safety risk. Summary of the invention

[0003] An object of the present invention is to provide a top cover structure that can improve the yield and efficiency of a battery cell manufacturing process.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] A top cover structure is provided, comprising a cover plate and a first plastic part, wherein the first plastic part is attached to a side of the cover plate facing the inside of the battery, a first positioning structure is provided on the cover plate, a pole through hole and a second positioning structure are provided on the first plastic part, the first positioning structure and the second positioning structure are matched in a concave-convex manner to limit the relative position of the first plastic part and the cover plate, and the second positioning structure comprises M groups of positioning parts, along the length direction of the first plastic part, starting from the center of the pole through hole, a group of the positioning parts is provided at intervals of a preset length W, and the preset length W satisfies, , M is a positive integer.

[0006] Optionally, when the width L of the first plastic part is less than 20 mm, each group of the positioning parts includes one positioning part along the width direction of the first plastic part.

[0007] Optionally, the width H of the positioning portion satisfies, ;

[0008] And / or, the width H of each of the positioning portions and the width L of the first plastic part satisfy, .

[0009] Optionally, the center of the positioning portion is located on a midline of the first plastic part in a width direction.

[0010] Optionally, when the width L of the first plastic part is greater than or equal to 20 mm, along the width direction of the first plastic part, each group of the positioning portions includes two positioning portions that are spaced apart.

[0011] Optionally, the distance W1 between the centers of the two positioning portions of each group satisfies, ;

[0012] And / or, the distance W1 between the centers of the two positioning portions of each group and the width L of the first plastic part satisfy, ;

[0013] And / or, the width H of each positioning portion satisfies, .

[0014] Optionally, the two positioning portions in each group are symmetrically arranged along a midline in a width direction of the first plastic part.

[0015] Optionally, the pole through hole is arranged near the first end of the first plastic part along the length direction, the second end of the first plastic part is arranged opposite to the first end, the value of M is 1, the positioning portion is located between the pole through hole and the second end, and the distance W2 between the center of the positioning portion and the second end meets the preset length W, .

[0016] Another object of the present invention is to provide a battery cell that can improve the yield and efficiency of the battery cell manufacturing process.

[0017] To achieve this object, the present invention adopts the following technical solutions:

[0018] Provided is a battery cell, comprising a shell and the above-mentioned top cover structure, wherein the top cover structure is sealed and arranged at an opening of the shell to form a battery cell housing.

[0019] Another object of the present invention is to provide a battery module that can improve the yield and efficiency of the battery cell manufacturing process.

[0020] To achieve this object, the present invention adopts the following technical solutions:

[0021] A battery module is provided, comprising a battery casing and at least one of the above-mentioned battery cells, wherein at least one of the battery cells is arranged in the battery casing.

[0022] Beneficial effects of the present invention:

[0023] The present invention provides a top cover structure, including a cover plate and a first plastic part, the first plastic part is attached to the side of the cover plate facing the inside of the battery, a first positioning structure is provided on the cover plate, a pole through hole and a second positioning structure are provided on the first plastic part, the first positioning structure and the second positioning structure are matched with each other in a concave-convex manner to limit the relative position of the first plastic part and the cover plate, so as to prevent the first plastic part from shifting at the second positioning structure of the first plastic part. The second positioning structure includes M groups of positioning parts, along the length direction of the first plastic part, starting from the center of the pole through hole, and a group of positioning parts is provided at intervals of a preset length W, and the preset length W satisfies, , M is a positive integer. By reasonably designing the position of the second positioning structure, it is possible to ensure that the end of the first plastic part away from the pole through hole does not shift or deform, thereby avoiding problems such as poor hot-melt insulation film, scratching of the cover plate or pole group during shell entry, tearing of the pole ear, peripheral welding and abnormal helium inspection, and improving the yield and efficiency of the battery cell process.

[0024] The present invention also provides a battery cell, comprising a shell and the above-mentioned top cover structure, wherein the top cover structure is sealed at the opening of the shell to form a battery cell shell. The battery cell can improve the battery cell process yield and efficiency.

[0025] The present invention also provides a battery module, comprising a battery housing and at least one of the above-mentioned battery cells, wherein the at least one battery cell is arranged in the battery housing. The battery module can improve the yield and efficiency of the battery cell manufacturing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is an exploded view of the top cover structure provided by the first embodiment of the present invention from a first perspective;

[0027] Figure 2 is an exploded view of the top cover structure provided by the first embodiment of the present invention from a second viewing angle;

[0028] Figure 3 is a schematic structural diagram of a first plastic part provided in Embodiment 1 of the present invention;

[0029] Figure 4 is a schematic structural diagram of the first plastic part provided by the second embodiment of the present invention from a third viewing angle;

[0030] Figure 5 is a structural schematic diagram of the first plastic part provided by the second embodiment of the present invention from a fourth viewing angle;

[0031] Figure 6 It is an exploded diagram of the battery cell provided in the third embodiment of the present invention.

[0032] In the figure:

[0033] 1. Cover plate; 11. First positioning structure;

[0034] 2. first plastic part; 21. positioning part;

[0035] 3. Riveting block; 4. Apply plastic; 5. Sealing ring; 6. Pole;

[0036] 100. Top cover structure; 200. Shell; 300. Pole group; 400. Insulating film. DETAILED DESCRIPTION

[0037] Before any embodiments of the application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the above drawings.

[0038] In this application, the terms "comprises", "includes", "has" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0039] In this application, the term "and / or" is a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects before and after are in an "and / or" relationship.

[0040] In the present application, the terms "connect", "combine", "couple", and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, direct connection refers to two parts or components being connected together without the need for an intermediate piece, and indirect connection refers to two parts or components being connected to at least one intermediate piece respectively, and the two parts or components being connected via the intermediate piece. In addition, "connect" and "couple" are not limited to physical or mechanical connections or couplings, and may include electrical connections or couplings.

[0041] In this application, it will be understood by those of ordinary skill in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions include the values ​​and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a specific value, the tolerances caused by manufacturing, assembly, and use associated with a specific value, etc. Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value plus or minus. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. In addition, "substantially" may refer to adding or subtracting a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) on the basis of the indicated angle when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular).

[0042] In this application, it will be understood by those skilled in the art that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0043] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, the bottom can include directly below, lower left, lower right, lower front, and lower back, etc.

[0044] Embodiment 1

[0045] Existing blade cells generally adopt a structural design with pole ears on both sides, so the positive pole and the negative pole are respectively arranged on the cover plates at both ends. At the pole position, the first plastic part is fixed by the pressing of the pole, and the first plastic part will not move or deviate at this position. However, there is no additional limiting structure on the other side of the first plastic part away from the pole, or the limiting structure is unreasonably designed, causing the first plastic part of the cover plate to often be skewed, the center lines of the two ends not coinciding, and the first plastic part to deform and shift. During the use of the battery cell, there will be problems such as poor hot-melt insulation film, scratches on the cover plate or pole group when entering the shell, torn pole ears, abnormal peripheral welding and helium inspection, which have a great impact on the yield and efficiency of the battery cell process. At the same time, the battery cell also has a large potential safety risk.

[0046] Therefore, this embodiment provides a top cover structure to prevent the first plastic part from being skewed, deformed, or displaced, thereby improving the yield and efficiency of the battery cell manufacturing process.

[0047] like Figure 1-Figure 3 As shown, the top cover structure 100 of this embodiment includes a cover plate 1 and a first plastic part 2. The first plastic part 2 is attached to the side of the cover plate 1 facing the inside of the battery. The cover plate 1 is provided with a first positioning structure 11. The first plastic part 2 is provided with a pole through hole and a second positioning structure. The first positioning structure 11 and the second positioning structure cooperate with each other to limit the relative position of the first plastic part 2 and the cover plate 1, so as to prevent the first plastic part 2 from shifting at the second positioning structure of the first plastic part 2. The second positioning structure includes M groups of positioning parts 21. Along the length direction of the first plastic part 2, starting from the center of the pole through hole, a group of positioning parts 21 is provided at intervals of a preset length W. The preset length W satisfies, , M is a positive integer. That is, according to the length of the first plastic part 2, the value of M can be 1, 2, 3, 4, 5, 6 or other positive integers, and one, two, three, four, five, six or more groups of positioning parts 21 can be set.

[0048] By rationally designing the position of the second positioning structure, it can be ensured that the end of the first plastic part 2 away from the pole through hole will not be displaced or deformed, thereby avoiding problems such as defective hot-melt insulating film 400, scratching of the cover plate 1 or the pole group 300 during shell entry, tearing of the pole ear, peripheral welding and helium inspection abnormalities, thereby improving the yield and efficiency of the battery cell process.

[0049] Optionally, the first positioning structure 11 is a groove structure, and the second positioning structure is a protrusion structure. That is, a groove is provided on the side of the cover plate 1 facing the first plastic part 2, and a protrusion is provided on the side of the first plastic part 2 facing the cover plate 1. Of course, in other embodiments, a protrusion may be provided on the cover plate 1, and a groove may be provided on the first plastic part 2. In other embodiments, the first positioning structure 11 of the cover plate 1 is partially configured as a protrusion and partially configured as a groove, and correspondingly, the second positioning structure of the first plastic part 2 is partially configured as a groove and partially configured as a protrusion.

[0050] Optionally, when the width L of the first plastic part 2 is less than 20 mm, each group of positioning portions 21 includes one positioning portion 21 along the width direction of the first plastic part 2 . Only one positioning portion 21 is provided to ensure good positioning effects at various locations along the width direction of the first plastic part 2 .

[0051] Optionally, the width H of the positioning portion 21 satisfies, , to ensure the positioning effect of the positioning portion 21. Optionally, the width H of each positioning portion 21 and the width L of the first plastic part 2 meet, When the width of the positioning portion 21 is too small compared to the width of the first plastic part 2 , the positioning effect is poor. When the width of the positioning portion 21 is too large compared to the width of the first plastic part 2 , the structural strength of the cover plate 1 at the position corresponding to the positioning portion 21 will be affected.

[0052] Optionally, the center of the positioning portion 21 is located on the midline of the first plastic part 2 in the width direction to ensure balanced force along the width direction of the first plastic part 2 .

[0053] Optionally, the pole through hole is arranged near the first end of the first plastic part 2 along the length direction, the second end of the first plastic part 2 is arranged opposite to the first end, the value of M is 1, the positioning portion 21 is located between the pole through hole and the second end, and the distance W2 between the center of the positioning portion 21 and the second end meets the preset length W, That is, when only one set of positioning portions 21 is provided, the positioning portions 21 are closer to the second end to ensure that the second end does not shift.

[0054] As shown in Table 1 below, the six comparative examples are top cover structures 100 of six sizes respectively, and the six top cover structures 100 are all provided with a positioning portion 21 on the first plastic part 2 , and a groove is correspondingly provided on the cover plate 1 .

[0055] The preset length W of the top cover structure 100 of Comparative Example 1 is less than 60 mm, and The value of is greater than 0.38, that is, the positioning portion 21 is too close to the pole through hole and is slightly far from the second end of the first plastic part 2. After testing, the cover plate 1 and the first plastic part 2 of the top cover structure 100 are slightly relatively skewed and eccentric at the end of the second end of the first plastic part 2. The production line yield of the top cover structure 100 is only 98.6%.

[0056] Table 1

[0057]

[0058] The top cover structure 100 of Comparative Example 2 The value of is further increased. After testing, it is found that the cover plate 1 and the first plastic part 2 of the top cover structure 100 with this size design have relative skewness and eccentricity at the end of the second end of the first plastic part 2. The production line yield of the top cover structure 100 is further reduced to 98.4%.

[0059] The width H of the positioning portion 21 of the top cover structure 100 of comparative example 3 is less than 4 mm, and the ratio H / L of the width H of the positioning portion 21 to the width L of the first plastic part 2 is less than 0.2, that is, the positioning portion 21 is narrow. After testing, the cover plate 1 and the first plastic part 2 of the top cover structure 100 with this size design only have slight relative skewness and eccentricity at the end of the second end of the first plastic part 2, but the positioning portion 21 is not strong enough and is easily damaged, and the production line yield of the top cover structure 100 is further reduced to 97.4%.

[0060] The width H of the positioning portion 21 of the top cover structure 100 of comparative example 4 is less than 4 mm, but the ratio H / L of the width H of the positioning portion 21 to the width L of the first plastic part 2 is greater than 0.2, that is, the positioning portion 21 is narrow, but the proportion is still appropriate. After testing, the cover plate 1 and the first plastic part 2 of the top cover structure 100 with this size design do not have the phenomenon of relative skewness and eccentricity at the end of the second end of the first plastic part 2, but the strength of the positioning portion 21 is still insufficient and easy to be damaged, and the production line yield of the top cover structure 100 can reach 98.3%.

[0061] The width H of the positioning portion 21 of the top cover structure 100 of comparative example 5 is greater than 4 mm, but the ratio H / L of the width H of the positioning portion 21 to the width L of the first plastic part 2 is greater than 0.5, that is, the positioning portion 21 is too wide relative to the first plastic part 2. After testing, the cover plate 1 and the first plastic part 2 of the top cover structure 100 with this size design do not have the phenomenon of relative skewness and eccentricity at the end of the second end of the first plastic part 2. However, the groove on the cover plate 1 is set too wide, which affects the strength and flatness of the cover plate 1. The production line yield of the top cover structure 100 can reach 98.6%.

[0062] The preset length W of the top cover structure 100 of Comparative Example 6 is greater than 100 mm, and The value of is greater than 0.38, that is, the distance between the pole through hole and the second end of the top cover structure 100 is 170 mm. Only one set of positioning parts 21 may not meet the positioning requirements within a longer size range. After testing, the cover plate 1 and the first plastic part 2 of the top cover structure 100 with this size design are obviously relatively skewed and eccentric at the end of the second end of the first plastic part 2. The production line yield of the top cover structure 100 is only 97.7%.

[0063] As shown in Table 1 above, the six examples are top cover structures 100 of six sizes respectively, and the six top cover structures 100 are all provided with a positioning portion 21 on the first plastic part 2 , and a groove is correspondingly provided on the cover plate 1 .

[0064] The values ​​of the preset length W of Example 1, Example 2, Example 3, Example 4, Example 5 and Example 6 are all within the range of 60 mm-100 mm, and The values ​​of are all less than 0.38, the width H of the positioning portion 21 is greater than or equal to 4mm, and the ratio H / L of the width H of the positioning portion 21 to the width L of the first plastic part 2 is greater than or equal to 0.2 and less than 0.5. After testing, there is no relative skew, bending, eccentricity or other phenomena between the cover plate 1 and the first plastic part 2 of Example 1, Example 2, Example 3, Example 4, Example 5 and Example 6, there is no abnormality in the battery test assembly, and the production line yield is greater than 99%. It can be seen that the top cover structure 100 that meets the above-mentioned size requirements can significantly improve the yield of the battery process, and does not require additional adjustment procedures, which can greatly improve production efficiency.

[0065] Optionally, the top cover structure 100 further includes a riveting block 3, an upper plastic 4, a sealing ring 5 and a pole 6, wherein one end of the pole 6 is located on the side of the cover plate 1 facing the inside of the battery, and the other end extends out of the cover plate 1 and is riveted to the riveting block 3. The upper plastic 4 is arranged between the riveting block 3 and the cover plate 1, and the sealing ring 5 is sleeved on the pole 6, and is partially located between the cover plate 1 and the first plastic part 2, and partially located between the pole 6 and the inner wall of the through hole of the cover plate 1.

[0066] Of course, in other embodiments, the pole assembly of the top cover structure 100 may not be provided with the riveting block 3, but the end of the pole 6 may be directly processed to form the riveted fixing edge of the pole 6, which can also ensure the firm positioning of the pole 6. In other embodiments, one end of the pole 6 may be fixed in the form of rubber encapsulation, or an extra bendable structure may be provided on the cover plate 1, and the bendable structure may be bent after the pole 6 is inserted to form a fixed bending edge of the pole 6, which can also achieve the fixation of the pole 6.

[0067] The top cover structure 100 solves the problem of relative skewness of the first plastic part 2 by setting a concave-convex matching structure on the cover plate 1 and the first plastic part 2. By reasonably designing the position of the second positioning structure, it can be ensured that the end of the first plastic part 2 away from the pole through hole does not shift or deform, thereby avoiding problems such as bad hot-melt insulating film 400, scratching of the cover plate 1 or pole group 300 during shell entry, tearing of the pole ear, peripheral welding and abnormal helium inspection, and improving the process yield and efficiency of the battery cell. The concave-convex matching structure on the cover plate 1 and the first plastic part 2 is formed by mature technology, which can reduce production costs. This embodiment also provides the relevant size design of the above-mentioned concave-convex matching structure, which can prevent the battery cell from being defective due to unreasonable design positioning. The standardized positioning structure design can increase the structural strength and safety performance of the cover plate 1, improve the stability of the battery cell, and further improve the process yield and automated production efficiency.

[0068] Embodiment 2

[0069] This embodiment discloses a top cover structure 100. The top cover structure 100 in this embodiment is different from the top cover structure 100 in the first embodiment in that: Figure 4-Figure 5As shown, optionally, when the width L of the first plastic part 2 is greater than or equal to 20 mm, along the width direction of the first plastic part 2 , each group of positioning portions 21 includes two positioning portions 21 that are spaced apart.

[0070] Optionally, the distance W1 between the centers of the two positioning portions 21 of each group satisfies, , to prevent the distance between the two positioning portions 21 from being too close.

[0071] Optionally, the distance W1 between the centers of the two positioning portions 21 of each group and the width L of the first plastic part 2 satisfy: If the ratio is too small, the distance between the two positioning portions 21 is too close, and the edge area of ​​the first plastic part 2 along the width direction cannot be fixed. If the ratio is too large, the two positioning portions 21 are too close to the edge. Accordingly, the groove on the cover plate 1 will also be too close to the edge, which will affect the structural strength of the cover plate 1.

[0072] Optionally, the width H of each positioning portion 21 satisfies, When the positioning portion 21 is too narrow, the positioning effect is poor.

[0073] Optionally, the two positioning portions 21 of each group are symmetrically arranged along the midline of the width direction of the first plastic part 2 , so as to ensure that the positioning effect of the positioning portions 21 at various locations along the width direction of the first plastic part 2 is relatively balanced.

[0074] As shown in Table 2 below, the six comparative examples are top cover structures 100 of six sizes respectively, and the six top cover structures 100 are all provided with a group of positioning portions 21 on the first plastic part 2, and this group of positioning portions 21 includes two positioning portions 21 spaced apart along the width direction of the first plastic part 2, and two grooves are correspondingly provided on the cover plate 1.

[0075] The preset length W of the top cover structure 100 of Comparative Example 1 is less than 60 mm, and The value of is greater than 0.38, that is, the two positioning parts 21 are too close to the pole through hole and are slightly far from the second end of the first plastic part 2. After testing, the cover plate 1 and the first plastic part 2 of the top cover structure 100 have a slight relative skew and eccentricity at the end of the second end of the first plastic part 2. The production line yield of the top cover structure 100 reaches 98.7%.

[0076] Table 2

[0077]

[0078] The top cover structure 100 of Comparative Example 2 The value of is further increased. After testing, it is found that the cover plate 1 and the first plastic part 2 of the top cover structure 100 with this size design have relative skewness and eccentricity at the end of the second end of the first plastic part 2, and the production line yield of the top cover structure 100 is further reduced to 98.5%.

[0079] The top cover structure 100 of Comparative Example 3 The value of is greater than 0.8, that is, the distance between the two positioning parts 21 is too large, and too close to the two side edges of the first plastic part 2. After testing, the cover plate 1 and the first plastic part 2 of the top cover structure 100 with this size design do not have the phenomenon of relative skewness and eccentricity at the end of the second end of the first plastic part 2, but the two grooves on the cover plate 1 are too close to the two side edges of the cover plate 1, resulting in a weakened side edge strength of the cover plate 1, which is easy to cause poor flatness, resulting in an increase in the gap between the first plastic part 2 and the cover plate 1, and the production line yield of the top cover structure 100 is further reduced to 98.2%.

[0080] The top cover structure 100 of Comparative Examples 4 and 5 The values ​​of are all less than 0.5, that is, the two positioning parts 21 are too close to the center line of the first plastic part 2, which will weaken the positioning effect. After testing, the cover plate 1 and the first plastic part 2 of the top cover structure 100 with this size design have slight relative skewness and eccentricity at the end of the second end of the first plastic part 2, and the production line yield of the top cover structure 100 is 98.4% and 98.6% respectively.

[0081] The preset length W of the top cover structure 100 of Comparative Example 6 is greater than 100 mm, and The value of is greater than 0.38, that is, the distance between the pole through hole and the second end of the top cover structure 100 is 170mm. Only one set of positioning parts 21 may not meet the positioning requirements within a longer size range. After testing, the cover plate 1 and the first plastic part 2 of the top cover structure 100 have obvious relative skewness and eccentricity at the end of the second end of the first plastic part 2. The production line yield of the top cover structure 100 is only 97.9%.

[0082] As shown in Table 2 above, the four examples are top cover structures 100 of four sizes respectively, and the four top cover structures 100 are all provided with a group of positioning portions 21 on the first plastic part 2, and this group of positioning portions 21 includes two positioning portions 21 spaced apart along the width direction of the first plastic part 2, and two grooves are correspondingly provided on the cover plate 1.

[0083] The values ​​of the preset length W of Example 1, Example 2, Example 3 and Example 4 are all within the range of 60 mm-100 mm, and The values ​​of are all less than 0.38, the distance W1 between the centers of the two positioning parts 21 is greater than or equal to 6mm, and the ratio of the distance W1 between the centers of the two positioning parts 21 to the width L of the first plastic part 2 is between 0.5-0.8. After testing, there is no relative skew, bending, or eccentricity between the cover plate 1 and the first plastic part 2 of Example 1, Example 2, Example 3, and Example 4, and the flatness of the cover plate 1 meets the requirements after stamping, and there is no abnormality in the battery test assembly. The production line yield is greater than 99%. It can be seen that the top cover structure 100 that meets the above-mentioned size requirements can significantly improve the yield of the battery cell process, and does not require additional adjustment procedures, which can greatly improve production efficiency.

[0084] The top cover structure 100 solves the problem of relative skewness of the first plastic part 2 by setting a concave-convex matching structure on the cover plate 1 and the first plastic part 2. By reasonably designing the positions of the two positioning parts 21, it can be ensured that the end of the first plastic part 2 away from the pole through hole does not shift and deform, thereby avoiding problems such as poor hot-melt insulation film 400, scratching of the cover plate 1 or the pole group 300 during shell entry, tearing of the pole ear, peripheral welding and abnormal helium inspection, and improving the process yield and efficiency of the battery cell. The concave-convex matching structure on the cover plate 1 and the first plastic part 2 is formed by mature technology, which can reduce production costs. This embodiment also provides the relevant dimensional design of the relative position of the two positioning parts 21 when two positioning parts 21 are set in each group, which can prevent the battery cell from being defective due to unreasonable design positioning. The standardized positioning structure design can increase the structural strength and safety performance of the cover plate 1, improve the stability of the battery cell, and further improve the process yield and automated production efficiency.

[0085] In addition, the rest of the structure of the top cover structure 100 provided in this embodiment is the same as that of the top cover structure 100 in the first embodiment, and will not be described again.

[0086] Embodiment 3

[0087] This embodiment provides a battery cell, such as Figure 6 As shown, the battery cell includes a shell 200 and the top cover structure 100 in the first or second embodiment, and the top cover structure 100 is sealed and disposed at the opening of the shell 200 to form a battery cell shell.

[0088] Optionally, the battery cell further includes an electrode group 300 and an insulating film 400 , wherein the insulating film 400 is sleeved on the electrode group 300 , and both are arranged in the battery cell casing.

[0089] The top cover structure 100 of the battery cell solves the problem of relative skewness of the first plastic part 2 by setting a concave-convex matching structure on the cover plate 1 and the first plastic part 2. By reasonably designing the size and position of the positioning part 21, it can be ensured that the end of the first plastic part 2 away from the pole through hole does not shift and deform, thereby avoiding problems such as bad hot-melt insulation film 400, scratching of the cover plate 1 or pole group 300 during shell entry, tearing of the pole ear, peripheral welding and abnormal helium inspection, and ensuring that the flatness of the cover plate is not affected, thereby improving the overall yield and efficiency of the battery cell process.

[0090] The concave-convex matching structure on the cover plate 1 and the first plastic part 2 is formed by a mature process, which can reduce production costs. By reasonably designing the size of the top cover structure, the size and relative position of the positioning part 21, it is possible to prevent the battery from being defective due to unreasonable design and positioning. Standardizing the positioning structure design can increase the structural strength and safety performance of the cover plate 1, improve the stability of the battery, and further improve the process yield and automated production efficiency.

[0091] This embodiment also provides a battery module, including a battery housing and at least one of the above-mentioned batteries, wherein the at least one battery cell is arranged in the battery housing. When multiple batteries are arranged, the multiple batteries can be arranged in series, parallel or series-parallel according to the specifications of the battery module.

[0092] The battery module can improve the yield and efficiency of the battery cell manufacturing process, reduce production costs, and improve the quality and stability of the battery module.

[0093] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The top cover structure is characterized in that: The battery comprises a cover plate (1) and a first plastic part (2), wherein the first plastic part (2) is attached to a side of the cover plate (1) facing the inside of the battery, the cover plate (1) is provided with a first positioning structure (11), the first plastic part (2) is provided with a pole through hole, and a second positioning structure, the first positioning structure (11) and the second positioning structure are matched in a concave-convex manner to limit the relative position of the first plastic part (2) and the cover plate (1), and the second positioning structure comprises M groups of positioning portions (21), and along the length direction of the first plastic part (2), starting from the center of the pole through hole, a group of the positioning portions (21) is provided at intervals of a preset length W, and the preset length W satisfies: , M is a positive integer.

2. The top cover structure according to claim 1, characterized in that: When the width L of the first plastic part (2) is less than 20 mm, along the width direction of the first plastic part (2), each group of the positioning parts (21) comprises one positioning part (21).

3. The top cover structure according to claim 2, characterized in that: The width H of the positioning portion (21) satisfies: ; And / or, the width H of each positioning portion (21) and the width L of the first plastic part (2) satisfy: .

4. The top cover structure according to claim 2, characterized in that: The center of the positioning portion (21) is located on the midline of the first plastic part (2) in the width direction.

5. The top cover structure according to claim 1, characterized in that: When the width L of the first plastic part (2) is greater than or equal to 20 mm, along the width direction of the first plastic part (2), each group of the positioning portions (21) comprises two positioning portions (21) arranged at intervals.

6. The top cover structure according to claim 5, characterized in that: The distance W1 between the centers of the two positioning portions (21) of each group satisfies, ; and / or, the distance W1 between the centers of the two positioning portions (21) of each group and the width L of the first plastic part (2) satisfy: ; And / or, the width H of each positioning portion (21) satisfies: .

7. The top cover structure according to claim 5, characterized in that: The two positioning portions (21) in each group are symmetrically arranged along the midline in the width direction of the first plastic part (2).

8. The top cover structure according to any one of claims 1 to 7, characterized in that: The pole through hole is arranged near the first end of the first plastic part (2) along the length direction, the second end of the first plastic part (2) is arranged opposite to the first end, the value of M is 1, the positioning portion (21) is located between the pole through hole and the second end, and the distance W2 between the center of the positioning portion (21) and the second end satisfies the preset length W, .

9. A battery cell, characterized in that: It comprises a shell (200) and a top cover structure according to any one of claims 1 to 8, wherein the top cover structure (100) is sealed at an opening of the shell (200) to form a battery cell housing.

10. A battery module, characterized in that: The invention comprises a battery casing and at least one battery cell as claimed in claim 9, wherein at least one battery cell is arranged in the battery casing.

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