Cover assembly and battery cell

Abstract

This application relates to a cover plate assembly and a battery cell, belonging to the field of battery technology. The cover plate assembly includes a cover plate, a terminal post assembly, and an electrical connector. The cover plate includes a first side and a second side disposed opposite to each other along a first direction. The second side has a boss, and at least one side of the boss along the second direction and / or a third direction forms an accommodating area with the second side. The cover plate has a mounting hole, with both ends of the mounting hole penetrating the first side and the boss, respectively. The terminal post assembly is disposed within the mounting hole. One end of the electrical connector is connected to the terminal post assembly, and the other end of the electrical connector extends into the accommodating area. This cover plate assembly and battery cell can improve space utilization and alleviate the problem of limited busbar installation space.

Description

Technical Field

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

[0002] The cover plate of a battery cell typically houses a terminal post assembly, which is electrically connected to the tabs on the electrode assembly inside the cell to facilitate current transfer. In related technologies, the terminal post assembly protrudes excessively from the outer side of the cover plate (the side of the cover plate furthest from the electrode assembly), occupying a significant amount of space. This not only results in low space utilization but also provides limited installation space for the busbar, making it inconvenient to solder the busbar onto the terminal post assembly. Summary of the Invention

[0003] To address the aforementioned technical problems, embodiments of this application provide a cover plate assembly and a battery cell, which can improve space utilization and alleviate the problem of limited busbar installation space.

[0004] In a first aspect, a cover plate assembly is provided, comprising: A cover plate includes a first side and a second side disposed opposite to each other along a first direction. The second side is provided with a boss, and at least one side of the boss along the second direction and / or a third direction forms an accommodating area between the boss and the second side. The cover plate is provided with a mounting hole, the two ends of which respectively penetrate the first side and the boss. The first direction represents the thickness direction of the cover plate; the second direction represents the length direction of the cover plate; and the third direction represents the width direction of the cover plate. The pole assembly is disposed within the mounting hole; An electrical connector, one end of which is connected to the pole assembly, and the other end of which extends into the receiving area.

[0005] According to a first aspect of this application, the mounting hole includes: The first hole segment, one end of which penetrates the first side; The second hole segment has one end connected to the first hole segment and the other end passing through the boss; Wherein, the projection of the second hole segment along the first direction is located within the outer contour of the first hole segment; the projection of the first hole segment along the first direction is located within the outer contour of the boss.

[0006] According to a first aspect of this application, the pole assembly includes: The pole post is disposed within the first hole section and the second hole section; A riveting component is disposed within the first hole section, and the riveting component is sleeved on the pole post; A first plastic component is disposed within the first hole segment, and the first plastic component is sleeved between the riveting component and the inner wall of the first hole segment.

[0007] According to a first aspect of this application, the thickness of the riveted member along the first direction is A, in mm; The upper edge of the rivet protrudes relative to the upper edge of the first plastic part along the first direction, and the distance between the upper edge of the rivet and the upper edge of the first plastic part along the first direction is B, in mm. The condition A and the condition B satisfy: 0 < B / A ≤ 0.5.

[0008] According to a first aspect of this application, the distance between the outer wall of the first plastic part and the inner wall of the first hole segment along the second direction is C, in mm; wherein C satisfies: 0.3mm≤C≤3mm.

[0009] According to a first aspect of this application, the pole post includes a base and a column body, one end of the column body is connected to the base, and the column body is disposed in the first hole segment and the second hole segment; the riveting member is sleeved on the column body. The cover plate assembly also includes: A second plastic component is fitted onto the column, with a portion of the second plastic component placed between the base and the boss; another portion of the second plastic component extends into the receiving area and is placed between the electrical connector and the second side. Wherein, the distance between the portion of the second plastic part extending into the receiving area and the outer wall of the boss along the second direction is G1, in mm; wherein G1 satisfies: G1 ≥ 0.2 mm; and / or, The distance between the portion of the second plastic part extending into the accommodating area and the outer wall of the boss along the third direction is G2, in mm; G2 satisfies: G2≥0.2mm.

[0010] According to a first aspect of this application, the depth of the first hole segment along the first direction is D, in mm; the distance between the first side and the second side along the first direction is T, in mm; and D and T satisfy: 0.6 mm ≤ D ≤ 1.5 T.

[0011] According to a first aspect of this application, the distance between the inner wall of the first hole segment and the outer wall of the boss along the second direction is E, in mm; the distance between the first side and the second side along the first direction is T, in mm; and E and T satisfy: 0.7mm≤E≤T.

[0012] According to a first aspect of this application, the angle between the bottom wall of the first hole segment and the side wall of the first hole segment is F, wherein F satisfies: 90°≤F≤165°.

[0013] Secondly, a battery cell is also provided, including: The casing has an opening; An electrode assembly is disposed within the housing, and the electrode assembly is provided with electrode tabs; As described in the previous embodiment, the cover plate assembly is located at one end of the electrode group, the electrical connector is connected to the electrode tab, and the cover plate is connected to the housing to close the opening.

[0014] The cover plate assembly and battery cell provided in this application embodiment, by providing a boss on the second side of the cover plate, and forming a receiving area between the boss and at least one side along the second direction and / or the third direction, and placing a portion of the electrical connector within the receiving area, can reduce the space occupied by the electrical connector between the electrode tab and the terminal assembly. Furthermore, the terminal assembly can be moved along the first direction towards the electrode group, thus reducing the height of the terminal assembly protruding relative to the first side along the first direction, improving space utilization, and reserving more installation space for the busbar, thereby addressing the problem of limited busbar installation space. Attached Figure Description

[0015] The above and other objects, features, and advantages of this application will become more apparent from the more detailed description of the embodiments of this application in conjunction with the accompanying drawings. The drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof. In the drawings, the same reference numerals generally represent the same components or steps.

[0016] Figure 1 This is a schematic diagram of the structure of a cover plate assembly provided for an exemplary embodiment of this application.

[0017] Figure 2 A cross-sectional view of a cover plate assembly provided for an exemplary embodiment of this application from a first perspective.

[0018] Figure 3 for Figure 2 Enlarged schematic diagram of point M in the middle.

[0019] Figure 4 A cross-sectional view of a cover plate assembly provided for an exemplary embodiment of this application from a second perspective.

[0020] Reference numerals: 100-Cover plate assembly; 110-Cover plate; 111-First side; 112-Second side; 113-Boss; 114-Accommodation area; 115-Mounting hole; 1151-First hole segment; 1152-Second hole segment; 120-Pole post assembly; 121-Pole post; 1211-Base; 1212-Post; 122-Rivet; 123-First plastic part; 130-Electrical connector; 140-Second plastic part. Detailed Implementation

[0021] Hereinafter, exemplary embodiments according to this application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments of this application. It should be understood that this application is not limited to the exemplary embodiments described herein.

[0022] Figure 1 This is a schematic diagram of the structure of a cover plate assembly provided for an exemplary embodiment of this application. Figure 1 As shown, the battery cell provided in this embodiment may include a housing, an electrode assembly, and a cover assembly 100. The housing has an opening, through which the electrode assembly can be fitted into the housing. The cover assembly 100 is disposed at one end of the electrode assembly and can be connected to the housing. The cover assembly 100 can close the opening. The cover assembly 100 and the housing can prevent foreign objects from entering the electrode assembly, thus protecting the electrode assembly.

[0023] like Figure 1 As shown, the cover plate assembly 100 provided in this application embodiment may include a cover plate 110, which can be used to directly connect to the aforementioned housing to close the opening and prevent foreign objects from entering the electrode assembly through the opening.

[0024] Figure 2 A cross-sectional view of a cover plate assembly provided for an exemplary embodiment of this application from a first perspective. Figure 3 for Figure 2 An enlarged diagram of point M in the middle. (See diagram below.) Figures 1 to 3 As shown, the cover plate 110 is provided with a mounting hole 115; correspondingly, the cover plate assembly 100 may also include a pole post assembly 120 and an electrical connector 130. The pole post assembly 120 is disposed in the mounting hole 115, the electrical connector 130 is connected to the pole post assembly 120, and the electrical connector 130 is connected to the tab (the pole group is provided with a tab). Current can be transmitted between the pole post assembly 120 and the tab through the electrical connector 130.

[0025] It should be noted that, in practical applications, the aforementioned battery cell may also include a busbar, which is connected to the end of the terminal assembly 120 away from the electrical connector 130. In other words, the busbar, terminal assembly 120, electrical connector 130, and electrode tab form a current transmission path, enabling the input or output of current.

[0026] like Figure 2 and Figure 3 As shown, the cover plate 110 may include a direction along the first direction (which can be understood as the thickness direction of the cover plate 110, see reference for details). Figure 3 The first side 111 and the second side 112 are arranged opposite each other in the Z-axis direction. After the cover plate 110 is connected to the housing and the opening is closed, the second side 112 is the side of the cover plate 110 facing the pole group, and the first side 111 is the side of the cover plate 110 away from the pole group.

[0027] In the related technology, the height of the pole assembly 120 protruding in the first direction relative to the outer side of the cover plate 110 (that is, the aforementioned first side 111) is too large, occupying a lot of space in the first direction, resulting in low space utilization of the battery cell; and, because the pole assembly 120 occupies a lot of space in the first direction, the installation space provided for the busbar is small, making it inconvenient to weld the busbar to the pole assembly 120.

[0028] Therefore, such as Figure 2 and Figure 3 As shown in this embodiment, the second side 112 is provided with a boss 113, and the two ends of the aforementioned mounting hole 115 respectively penetrate the first side 111 and the boss 113. The boss 113 is along the second direction (which can be understood as the length direction of the cover plate 110, see reference for details). Figure 3 The X-axis direction in the figure) and / or the third direction (which can be understood as the width direction of the cover plate 110, see reference for details) Figure 4 A receiving area 114 is formed between at least one side (in the Y-axis direction) and the second side 112. Specifically, it can include the following various embodiments.

[0029] In one embodiment, a receiving area 114 may be formed between one side of the boss 113 along the second direction and the second side 112.

[0030] In one embodiment, receiving areas 114 may be formed between the opposite sides of the boss 113 along the second direction and different parts of the second side 112.

[0031] In one embodiment, a receiving area 114 may be formed between one side of the boss 113 along the second direction and the second side 112, and a receiving area 114 may also be formed between one side of the boss 113 along the third direction and the second side 112.

[0032] In one embodiment, the boss 113 may form receiving areas 114 between the opposite sides of the boss 113 along the second direction and different parts of the second side 112, and the boss 113 may form receiving areas 114 between the opposite sides of the boss 113 along the third direction and different parts of the second side 112.

[0033] like Figure 3As shown, one end of the aforementioned electrical connector 130 is connected to the terminal assembly 120, and the other end of the electrical connector 130 extends into the receiving area 114. By placing a portion of the electrical connector 130 within the receiving area 114, the space occupied by the electrical connector 130 between the tab and the terminal assembly 120 can be reduced. Furthermore, the terminal assembly 120 can be moved closer to the electrode group along the first direction, thus reducing the height of the terminal assembly 120 protruding relative to the first side 111 along the first direction, improving space utilization, and reserving more installation space for the busbar, thus addressing the problem of limited busbar installation space.

[0034] like Figure 3 As shown, the mounting hole 115 includes a first hole segment 1151 and a second hole segment 1152. One end of the first hole segment 1151 passes through the first side 111, one end of the second hole segment 1152 is connected to the first hole segment 1151, and the other end of the second hole segment 1152 passes through the boss 113.

[0035] It should be noted that the projection of the second hole segment 1152 along the first direction lies within the outer contour of the first hole segment 1151. Thus, the first hole segment 1151 can accommodate a portion of the pole post assembly 120. Specifically, after the pole post assembly 120 moves along the first direction towards the pole group, a portion of the pole post assembly 120 can extend into the first hole segment 1151, reducing the length of the pole post assembly 120 protruding relative to the first side 111. Furthermore, the portion of the pole post assembly 120 extending into the first hole segment 1151 can be adapted to the first hole segment 1151, preventing the pole post assembly 120 from wobbling.

[0036] like Figure 3 As shown, the projection of the first hole segment 1151 along the first direction is located within the outer contour of the boss 113. In this way, the length of the first hole segment 1151 along the second direction or the third direction can be prevented from exceeding the length of the boss 113 along the second direction or the third direction, thus effectively ensuring the structural strength of the cover plate 110.

[0037] It should be noted that since the second side 112 is provided with a boss 113, the cover plate 110 can be guaranteed to have sufficient solid structure to set the first hole segment 1151. That is, after the first hole segment 1151 is formed by stamping, the projection of the first hole segment 1151 along the first direction is located within the outer contour of the boss 113. The structure of the boss 113 can ensure that there is sufficient solid structure between the bottom wall of the first hole segment 1151 and the bottom wall of the boss 113, thereby ensuring the structural strength of the cover plate 110 and avoiding the problem of low structural strength of the cover plate 110 due to the setting of the first hole segment 1151, and preventing the cover plate 110 from deforming or breaking after the first hole segment 1151 is set.

[0038] In one embodiment, the first hole segment 1151 and the second hole segment 1152 may have the same shape. For example, the first hole segment 1151 and the second hole segment 1152 may both be cylindrical segments, elliptical cylindrical segments, or prism segments, etc.

[0039] In one embodiment, the shapes of the first hole segment 1151 and the second hole segment 1152 may also be different. For example, the first hole segment 1151 is a cylindrical segment and the second hole segment 1152 is a prism segment; or the first hole segment 1151 is a prism segment and the second hole segment 1152 is an elliptical cylindrical segment.

[0040] In one embodiment, the first hole segment 1151 and the second hole segment 1152 have the same shape and are coaxially arranged. The radial dimension (the shortest distance from the axis to the corresponding part of the inner wall) of each part on the inner wall of the first hole segment 1151 is greater than the radial dimension of the corresponding part on the inner wall of the second hole segment 1152. This can achieve the purpose of the projection of the second hole segment 1152 along the first direction being located within the outer contour of the first hole segment 1151.

[0041] In one embodiment, the first hole segment 1151 and the boss 113 may have the same shape. For example, the first hole segment 1151 may be a cylindrical segment and the boss 113 may be a cylinder 1212; the first hole segment 1151 may be an elliptical cylindrical segment and the boss 113 may be an elliptical cylinder 1212; the first hole segment 1151 may be a prism segment and the boss 113 may be a prism 1212.

[0042] In one embodiment, the shapes of the first hole segment 1151 and the boss 113 may also be different. For example, the first hole segment 1151 may be a cylindrical segment and the boss 113 may be an elliptical cylinder 1212; or the first hole segment 1151 may be a prism segment and the boss 113 may be a cylinder 1212.

[0043] In one embodiment, the first hole segment 1151 and the boss 113 have the same shape and are coaxially arranged. The radial dimension (the shortest distance from the axis to the corresponding part of the outer wall) of each part on the outer wall of the boss 113 is greater than the radial dimension of the corresponding part on the inner wall of the first hole segment 1151, so that the projection of the first hole segment 1151 along the first direction is located within the outer contour of the boss 113.

[0044] like Figure 3 As shown, the pole assembly 120 may include a pole 121 and a riveting member 122. The pole 121 is disposed within a first hole section 1151 and a second hole section 1152, and the riveting member 122 is disposed within the first hole section 1151. One end of the pole 121 is connected to the aforementioned electrical connector 130, and the other end of the pole 121 is riveted to the riveting member 122. The riveting member 122 may be sleeved on the pole 121 and is connected to the aforementioned busbar. Current can be input to the pole group or output from the pole group through the busbar, the riveting member 122, the pole 121, the electrical connector 130, and the tab.

[0045] like Figure 3 As shown, the pole assembly 120 may further include a first plastic part 123, which is disposed within the first hole section 1151 and sleeved between the riveting member 122 and the inner wall of the first hole section 1151. In this way, the first plastic part 123 can prevent the riveting member 122 from directly contacting the cover plate 110, thus avoiding short circuit accidents.

[0046] It should be noted that when the first plastic part 123 is fitted onto the riveting part 122, that is, when Figure 3 In the indicated state, the upper edge of the riveting part 122 protrudes relative to the upper edge of the first plastic part 123 along the first direction. This facilitates direct welding of the upper edge of the riveting part 122 to the busbar, thereby improving the welding efficiency and welding quality between the riveting part 122 and the busbar.

[0047] like Figure 3 As shown, the thickness of the rivet 122 along the first direction is A, in mm; the distance between the upper edge of the rivet 122 and the upper edge of the first plastic part 123 along the first direction is B, in mm. Regarding the situation where the B / A ratio is too large, firstly, the spacing B may be too large, resulting in a large B / A ratio. In this case, the protrusion height of the riveting part 122 relative to the first plastic part 123 along the first direction is relatively large, which will cause the riveting part 122 to occupy a large space, which is not conducive to improving the overall space utilization rate. Alternatively, the protrusion height of the first plastic part 123 relative to the opening of the first hole segment 1151 along the first direction may be relatively small, which will increase the risk of direct contact between the riveting part 122 and the cover plate 110. Secondly, the thickness A may be too small, resulting in a large B / A ratio. In this case, in order to ensure that the upper edge of the riveting part 122 protrudes relative to the upper edge of the first plastic part 123 along the first direction, the protrusion height of the first plastic part 123 relative to the opening of the first hole segment 1151 along the first direction needs to be relatively small, which will increase the risk of direct contact between the riveting part 122 and the cover plate 110.

[0048] Therefore, in this application embodiment, B / A is limited to the following range: 0 < B / A ≤ 0.5. This can effectively improve the aforementioned problems caused by excessively large B / A.

[0049] In one embodiment, B / A can be 0.08, 0.24, 0.5, etc.

[0050] like Figure 3As shown, the distance C between the outer wall of the first plastic part 123 and the inner wall of the first hole segment 1151 along the second direction is mm. If the distance C is too small, it will be difficult to assemble and attach parts in the area between the outer wall of the first plastic part 123 and the inner wall of the first hole segment 1151 along the second direction, affecting the overall assembly efficiency. If the distance C is too large, the opening size of the first hole segment 1151 will be too large, affecting the overall size design of the cover plate 110 in the second direction. This will easily lead to the cover plate 110 being too long along the second direction, increasing costs and occupying a large space. Alternatively, the first hole segment 1151 may occupy a large proportion of the cover plate 110 along the second direction, causing the structural strength of the cover plate 110 to fail to meet the requirements.

[0051] Therefore, in this embodiment, the spacing C is limited to the following range: 0.3mm ≤ C ≤ 3mm. This can improve the problems caused by the aforementioned spacing C being too large or too small.

[0052] In one embodiment, the spacing C can be 0.3mm, 0.5mm, 3mm, etc.

[0053] like Figure 3 As shown, the pole post 121 may include a base 1211 and a post 1212. One end of the post 1212 is connected to the base 1211, and the post 1212 is disposed within the first hole section 1151 and the second hole section 1152. In practical applications, the base 1211 is connected to the electrical connector 130, the end of the post 1212 away from the base 1211 is connected to the busbar, and a rivet block is sleeved on the post 1212 and riveted to the post 1212.

[0054] like Figure 2 and Figure 3 As shown, the cover plate assembly 100 may further include a second plastic part 140, which is sleeved on the post 1212. It should be noted that a portion of the second plastic part 140 is positioned between the base 1211 and the boss 113, preventing direct contact between the base 1211 and the boss 113 and avoiding a short circuit between the post 121 and the cover plate 110. Another portion of the second plastic part 140 extends into the receiving area 114 and is positioned between the second side 112 and the electrical connector 130, thus preventing direct contact between the second side 112 and the electrical connector 130 and avoiding a short circuit.

[0055] like Figure 3 As shown, the distance between the portion of the second plastic part 140 extending into the receiving area 114 and the outer wall of the boss 113 along the second direction is G1. If the distance G1 is too small, the second plastic part 140 is prone to interference with the boss 113 during the process of assembling the second plastic part 140 onto the cover plate 110, affecting the assembly accuracy and assembly efficiency of the second plastic part 140.

[0056] Therefore, in this embodiment of the application, the spacing G1 is limited to the following range: G1≥0.2mm. This can effectively improve the aforementioned problems caused by the spacing G1 being too small.

[0057] In one embodiment, the spacing G1 can be selected as 0.2mm, 0.4mm, 1mm, etc.

[0058] Figure 4 A cross-sectional view of a cover assembly 100 provided for an exemplary embodiment of this application from a second perspective. (See also:) Figure 4 As shown, the portion of the second plastic part 140 extending into the receiving area 114 is parallel to the outer wall of the boss 113 along a third direction (see details). Figure 4 The spacing along the Y-axis is G2. If the spacing G2 is too small, the second plastic part 140 will easily interfere with the boss 113 during the assembly of the second plastic part 140 onto the cover plate 110, affecting the assembly accuracy and efficiency of the second plastic part 140.

[0059] Therefore, in this embodiment of the application, the spacing G2 is limited to the following range: G2≥0.2mm. This can effectively improve the aforementioned problem caused by the spacing G2 being too small.

[0060] In one embodiment, the spacing G2 can be selected as 0.2mm, 0.4mm, 1mm, etc.

[0061] like Figure 3 As shown, the depth of the first hole segment 1151 along the first direction is D, in mm, and the distance between the first side 111 and the second side 112 along the first direction is T, in mm. It should be noted that if the depth D is too small, the portion of the pole post assembly 120 that can be accommodated in the first hole segment 1151 will be smaller, and the height of the portion of the pole post assembly 120 protruding relative to the opening of the first hole segment 1151 will decrease less along the first direction, resulting in a less significant improvement in space utilization. If the depth D is too large (in the case of the boss 113, the depth D exceeds the distance T by too much), it is easy to result in less solid structure between the bottom wall of the first hole segment 1151 and the bottom wall of the boss 113, affecting the overall structural strength of the cover plate 110 and making molding difficult.

[0062] Therefore, in this embodiment of the application, the depth D is limited to the following range: 0.6mm≤D≤1.5T. This can improve the problems caused by the aforementioned depth D being too large or too small.

[0063] In one embodiment, the depth D can be selected as 0.6 mm, 1 mm, 1.5 T, etc.

[0064] like Figure 3As shown, the distance between the inner wall of the first hole segment 1151 and the outer wall of the boss 113 along the second direction is E, in mm. If the distance E is too small, the solid structure between the inner wall of the first hole segment 1151 and the outer wall of the boss 113 will be thinner along the second direction, which will make the cover plate 110 prone to deformation or cracking during the stamping process; if the distance E is too large (the distance E is greater than the aforementioned distance T), it will be difficult to form the cover plate 110.

[0065] Therefore, in this embodiment of the application, the spacing E is limited to the following range: 0.7mm≤E≤T. This can effectively improve the problems caused by the spacing E being too large or too small.

[0066] In one embodiment, the spacing E can be selected as 0.7 mm, 1 mm, T, etc.

[0067] like Figure 3 As shown, the angle between the bottom wall and the side wall of the first hole segment 1151 is F. If the angle F is too large, it will compress the space of the accommodating area 114 and affect the size design of the electrical connector 130; if the angle F is too small, the first hole segment 1151 cannot be formed by the stamping process, which will affect the processing efficiency.

[0068] Therefore, in this embodiment of the application, the included angle F is limited to the following range: 90°≤F≤165°. This can effectively improve the problems caused by the included angle F being too large or too small.

[0069] In one embodiment, the included angle F can be selected as 90°, 100°, 165°, etc.

[0070] The present application solution will be further described below with reference to specific embodiments.

[0071] Example 1 The battery cell includes a housing, electrode assembly, and cover plate assembly 100. The housing has an opening, and the electrode assembly is disposed within the housing. The cover plate assembly 100 includes a cover plate 110, a terminal post assembly 120, and an electrical connector 130. The cover plate 110 is disposed at one end of the electrode assembly and is connected to the housing to close the opening. The cover plate 110 includes a first side 111 and a second side 112 disposed opposite to each other along a first direction. The second side 112 has a boss 113, and at least one side of the boss 113 along a second direction and / or a third direction forms a receiving area 114 between the boss 113 and the second side 112. The cover plate 110 has a mounting hole 115, and the two ends of the mounting hole 115 pass through the first side 111 and the boss 113, respectively. The terminal post assembly 120 is disposed within the mounting hole 115. One end of the electrical connector 130 is connected to the terminal post assembly 120, and the other end of the electrical connector 130 extends into the receiving area 114.

[0072] The mounting hole 115 includes a first hole segment 1151 and a second hole segment 1152. One end of the first hole segment 1151 passes through the first side 111. One end of the second hole segment 1152 communicates with the first hole segment 1151, and the other end of the second hole segment 1152 passes through the boss 113. The projection of the second hole segment 1152 along the first direction is located within the outer contour of the first hole segment 1151. The projection of the first hole segment 1151 along the first direction is located within the outer contour of the boss 113.

[0073] The pole assembly 120 includes a pole 121, a riveting member 122, and a first plastic part 123. The pole 121 is disposed within a first hole section 1151 and a second hole section 1152. The riveting member 122 is disposed within the first hole section 1151 and is sleeved on the pole 121. The first plastic part 123 is disposed within the first hole section 1151 and is sleeved between the riveting member 122 and the inner wall of the first hole section 1151.

[0074] The thickness of the riveting component 122 along the first direction is A; the upper edge of the riveting component 122 protrudes relative to the upper edge of the first plastic component 123 along the first direction, and the distance between the upper edge of the riveting component 122 and the upper edge of the first plastic component 123 along the first direction is B.

[0075] In this embodiment, A = 2.5 mm; B = 0.2 mm; B / A = 0.08 mm.

[0076] Example 2 This embodiment is basically the same as embodiment 1, except that: In this embodiment, A = 2.5 mm; B = 0.6 mm; B / A = 0.24 mm.

[0077] Example 3 This embodiment is basically the same as embodiment 1, except that: In this embodiment, A = 2.5 mm; B = 1 mm; B / A = 0.4 mm.

[0078] Example 4 This embodiment is basically the same as embodiment 1, except that: In this embodiment, A = 2.5 mm; B = 1.25 mm; B / A = 0.5 mm.

[0079] Comparative Example 1 This comparative example is basically the same as Example 1, except that: In this comparative example, A = 2.5 mm; B = 2 mm; B / A = 0.8 mm.

[0080] Test results The insulation between the riveted block and the cover plate 110 was tested. The test results are shown in Table 1.

[0081] Table 1 Example 5 The battery cell includes a housing, electrode assembly, and cover plate assembly 100. The housing has an opening, and the electrode assembly is disposed within the housing. The cover plate assembly 100 includes a cover plate 110, a terminal post assembly 120, and an electrical connector 130. The cover plate 110 is disposed at one end of the electrode assembly and is connected to the housing to close the opening. The cover plate 110 includes a first side 111 and a second side 112 disposed opposite to each other along a first direction. The second side 112 has a boss 113, and at least one side of the boss 113 along a second direction and / or a third direction forms a receiving area 114 between the boss 113 and the second side 112. The cover plate 110 has a mounting hole 115, and the two ends of the mounting hole 115 pass through the first side 111 and the boss 113, respectively. The terminal post assembly 120 is disposed within the mounting hole 115. One end of the electrical connector 130 is connected to the terminal post assembly 120, and the other end of the electrical connector 130 extends into the receiving area 114.

[0082] The mounting hole 115 includes a first hole segment 1151 and a second hole segment 1152. One end of the first hole segment 1151 passes through the first side 111. One end of the second hole segment 1152 communicates with the first hole segment 1151, and the other end of the second hole segment 1152 passes through the boss 113. The projection of the second hole segment 1152 along the first direction is located within the outer contour of the first hole segment 1151. The projection of the first hole segment 1151 along the first direction is located within the outer contour of the boss 113.

[0083] The pole assembly 120 includes a pole 121, a riveting member 122, and a first plastic part 123. The pole 121 is disposed within a first hole section 1151 and a second hole section 1152. The riveting member 122 is disposed within the first hole section 1151 and is sleeved on the pole 121. The first plastic part 123 is disposed within the first hole section 1151 and is sleeved between the riveting member 122 and the inner wall of the first hole section 1151.

[0084] The distance between the outer wall of the first plastic part 123 and the inner wall of the first hole section 1151 along the second direction is C.

[0085] In this embodiment, C = 0.3 mm.

[0086] Example 6 This embodiment is basically the same as embodiment 5, except that: In this embodiment, C = 0.9 mm.

[0087] Example 7 This embodiment is basically the same as embodiment 5, except that: In this embodiment, C = 1.5 mm.

[0088] Example 8 This embodiment is basically the same as embodiment 5, except that: In this embodiment, C = 2.1 mm.

[0089] Example 9 This embodiment is basically the same as embodiment 5, except that: In this embodiment, C = 3 mm.

[0090] Comparative Example 2 This comparative example is basically the same as Example 5, except that: In this comparative example, C = 0.1 mm.

[0091] Comparative Example 3 This comparative example is basically the same as Example 5, except that: In this comparative example, C = 4 mm.

[0092] Test results The assembly status of the patches was statistically analyzed, and the structural strength of the cover plate was tested. The test results are shown in Table 2.

[0093] Table 2 Example 10 The battery cell includes a housing, electrode assembly, and cover plate assembly 100. The housing has an opening, and the electrode assembly is disposed within the housing. The cover plate assembly 100 includes a cover plate 110, a terminal post assembly 120, and an electrical connector 130. The cover plate 110 is disposed at one end of the electrode assembly and is connected to the housing to close the opening. The cover plate 110 includes a first side 111 and a second side 112 disposed opposite to each other along a first direction. The second side 112 has a boss 113, and at least one side of the boss 113 along a second direction and / or a third direction forms a receiving area 114 between the boss 113 and the second side 112. The cover plate 110 has a mounting hole 115, and the two ends of the mounting hole 115 pass through the first side 111 and the boss 113, respectively. The terminal post assembly 120 is disposed within the mounting hole 115. One end of the electrical connector 130 is connected to the terminal post assembly 120, and the other end of the electrical connector 130 extends into the receiving area 114.

[0094] The mounting hole 115 includes a first hole segment 1151 and a second hole segment 1152. One end of the first hole segment 1151 passes through the first side 111. One end of the second hole segment 1152 communicates with the first hole segment 1151, and the other end of the second hole segment 1152 passes through the boss 113. The projection of the second hole segment 1152 along the first direction is located within the outer contour of the first hole segment 1151. The projection of the first hole segment 1151 along the first direction is located within the outer contour of the boss 113.

[0095] The depth of the first hole segment 1151 along the first direction is D; the distance between the first side 111 and the second side 112 along the first direction is T.

[0096] In this embodiment, D=0.6mm; T=2mm.

[0097] Example 11 This embodiment is basically the same as embodiment 10, except that: In this embodiment, D=1.4mm; T=2mm.

[0098] Example 12 This embodiment is basically the same as embodiment 10, except that: In this embodiment, D=2.2mm; T=2mm.

[0099] Example 13 This embodiment is basically the same as embodiment 10, except that: In this embodiment, D=2.8mm; T=2mm.

[0100] Example 14 This embodiment is basically the same as embodiment 10, except that: In this embodiment, D=3mm; T=2mm.

[0101] Comparative Example 4 This comparative example is basically the same as Example 10, except that: In this comparative example, D = 0.2 mm; T = 2 mm.

[0102] Comparative Example 5 This comparative example is basically the same as Example 10, except that: In this comparative example, D=4mm; T=2mm.

[0103] Test results The structural strength and molding yield of cover plate 110 were tested. The test results are shown in Table 3.

[0104] Table 3 Example 15 The battery cell includes a housing, electrode assembly, and cover plate assembly 100. The housing has an opening, and the electrode assembly is disposed within the housing. The cover plate assembly 100 includes a cover plate 110, a terminal post assembly 120, and an electrical connector 130. The cover plate 110 is disposed at one end of the electrode assembly and is connected to the housing to close the opening. The cover plate 110 includes a first side 111 and a second side 112 disposed opposite to each other along a first direction. The second side 112 has a boss 113, and at least one side of the boss 113 along a second direction and / or a third direction forms a receiving area 114 between the boss 113 and the second side 112. The cover plate 110 has a mounting hole 115, and the two ends of the mounting hole 115 pass through the first side 111 and the boss 113, respectively. The terminal post assembly 120 is disposed within the mounting hole 115. One end of the electrical connector 130 is connected to the terminal post assembly 120, and the other end of the electrical connector 130 extends into the receiving area 114.

[0105] The mounting hole 115 includes a first hole segment 1151 and a second hole segment 1152. One end of the first hole segment 1151 passes through the first side 111. One end of the second hole segment 1152 communicates with the first hole segment 1151, and the other end of the second hole segment 1152 passes through the boss 113. The projection of the second hole segment 1152 along the first direction is located within the outer contour of the first hole segment 1151. The projection of the first hole segment 1151 along the first direction is located within the outer contour of the boss 113.

[0106] The distance between the inner wall of the first hole section 1151 and the outer wall of the boss 113 along the second direction is E; the distance between the first side 111 and the second side 112 along the first direction is T.

[0107] In this embodiment, E=0.7mm; T=2mm.

[0108] Example 16 This embodiment is basically the same as embodiment 15, except that: In this embodiment, E=1.2mm; T=2mm.

[0109] Example 17 This embodiment is basically the same as embodiment 15, except that: In this embodiment, E=1.6mm; T=2mm.

[0110] Example 18 This embodiment is basically the same as embodiment 15, except that: In this embodiment, E=2mm; T=2mm.

[0111] Example 19 This embodiment is basically the same as embodiment 15, except that: In this embodiment, E=1.5mm; T=3mm.

[0112] Comparative Example 6 This comparative example is basically the same as Example 15, except that: In this comparative example, E = 0.3 mm; T = 2 mm.

[0113] Comparative Example 7 This comparative example is basically the same as Example 15, except that: In this comparative example, E=3mm; T=2mm.

[0114] Test results The molding yield of cover plate 11 was tested. The test results are shown in Table 4.

[0115] Table 4 Example 20 The battery cell includes a housing, electrode assembly, and cover plate assembly 100. The housing has an opening, and the electrode assembly is disposed within the housing. The cover plate assembly 100 includes a cover plate 110, a terminal post assembly 120, and an electrical connector 130. The cover plate 110 is disposed at one end of the electrode assembly and is connected to the housing to close the opening. The cover plate 110 includes a first side 111 and a second side 112 disposed opposite to each other along a first direction. The second side 112 has a boss 113, and at least one side of the boss 113 along a second direction and / or a third direction forms a receiving area 114 between the boss 113 and the second side 112. The cover plate 110 has a mounting hole 115, and the two ends of the mounting hole 115 pass through the first side 111 and the boss 113, respectively. The terminal post assembly 120 is disposed within the mounting hole 115. One end of the electrical connector 130 is connected to the terminal post assembly 120, and the other end of the electrical connector 130 extends into the receiving area 114.

[0116] The mounting hole 115 includes a first hole segment 1151 and a second hole segment 1152. One end of the first hole segment 1151 passes through the first side 111. One end of the second hole segment 1152 communicates with the first hole segment 1151, and the other end of the second hole segment 1152 passes through the boss 113. The projection of the second hole segment 1152 along the first direction is located within the outer contour of the first hole segment 1151. The projection of the first hole segment 1151 along the first direction is located within the outer contour of the boss 113.

[0117] The angle between the bottom wall and the side wall of the first hole section 1151 is F.

[0118] In this embodiment, F = 90°.

[0119] Example 21 This embodiment is basically the same as embodiment 20, except that: In this embodiment, F = 110°.

[0120] Example 22 This embodiment is basically the same as embodiment 20, except that: In this embodiment, F = 130°.

[0121] Example 23 This embodiment is basically the same as embodiment 20, except that: In this embodiment, F = 145°.

[0122] Example 24 This embodiment is basically the same as embodiment 20, except that: In this embodiment, F = 165°.

[0123] Comparative Example 8 This comparative example is basically the same as Example 20, except that: In this comparative example, F = 80°.

[0124] Comparative Example 9 This comparative example is basically the same as Example 20, except that: In this comparative example, F = 175°.

[0125] Test results The molding yield of cover plate 110 was tested. The test results are shown in Table 5.

[0126] Table 5 The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0127] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0128] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

[0129] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0130] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A cover plate assembly, characterized in that, include: A cover plate includes a first side and a second side disposed opposite to each other along a first direction. The second side is provided with a boss, and at least one side of the boss along the second direction and / or a third direction forms an accommodating area between the boss and the second side. The cover plate is provided with a mounting hole, the two ends of which respectively penetrate the first side and the boss. The first direction represents the thickness direction of the cover plate; the second direction represents the length direction of the cover plate; and the third direction represents the width direction of the cover plate. The pole assembly is disposed within the mounting hole; An electrical connector, one end of which is connected to the pole assembly, and the other end of which extends into the receiving area.

2. The cover plate assembly according to claim 1, characterized in that, The mounting holes include: The first hole segment, one end of which penetrates the first side; The second hole segment has one end connected to the first hole segment and the other end passing through the boss; Wherein, the projection of the second hole segment along the first direction is located within the outer contour of the first hole segment; the projection of the first hole segment along the first direction is located within the outer contour of the boss.

3. The cover plate assembly according to claim 2, characterized in that, The pole assembly includes: The pole post is disposed within the first hole section and the second hole section; A riveting component is disposed within the first hole section, and the riveting component is sleeved on the pole post; A first plastic component is disposed within the first hole segment, and the first plastic component is sleeved between the riveting component and the inner wall of the first hole segment.

4. The cover plate assembly according to claim 3, characterized in that, The thickness of the riveted component along the first direction is A, in mm; The upper edge of the rivet protrudes relative to the upper edge of the first plastic part along the first direction, and the distance between the upper edge of the rivet and the upper edge of the first plastic part along the first direction is B, in mm. The condition A and the condition B satisfy: 0 < B / A ≤ 0.

5.

5. The cover plate assembly according to claim 3, characterized in that, The distance between the outer wall of the first plastic part and the inner wall of the first hole segment along the second direction is C, in mm; C satisfies: 0.3mm≤C≤3mm.

6. The cover plate assembly according to claim 3, characterized in that, The pole post includes a base and a column body, one end of the column body is connected to the base, and the column body is disposed in the first hole section and the second hole section; the riveting component is sleeved on the column body; The cover plate assembly also includes: A second plastic component is fitted onto the column, with a portion of the second plastic component placed between the base and the boss; another portion of the second plastic component extends into the receiving area and is placed between the electrical connector and the second side. Wherein, the distance between the portion of the second plastic part extending into the receiving area and the outer wall of the boss along the second direction is G1, in mm; wherein G1 satisfies: G1 ≥ 0.2 mm; and / or, The distance between the portion of the second plastic part extending into the accommodating area and the outer wall of the boss along the third direction is G2, in mm; G2 satisfies: G2≥0.2mm.

7. The cover plate assembly according to claim 2, characterized in that, The depth of the first hole segment along the first direction is D, in mm; the distance between the first side and the second side along the first direction is T, in mm; D and T satisfy: 0.6mm≤D≤1.5T.

8. The cover plate assembly according to claim 2, characterized in that, The distance between the inner wall of the first hole segment and the outer wall of the boss along the second direction is E, in mm; the distance between the first side and the second side along the first direction is T, in mm; E and T satisfy: 0.7mm≤E≤T.

9. The cover plate assembly according to claim 2, characterized in that, The angle between the bottom wall and the side wall of the first hole segment is F, and F satisfies: 90°≤F≤165°.

10. A battery cell, characterized in that, include: The casing has an opening; An electrode assembly is disposed within the housing, and the electrode assembly is provided with electrode tabs; The cover plate assembly as described in any one of claims 1 to 9, wherein the cover plate is disposed at one end of the electrode group, the electrical connector is connected to the electrode tab, and the cover plate is connected to the housing to close the opening.

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