Battery cover plate and battery pack

Abstract

This application relates to a battery cover and a battery pack, belonging to the field of battery technology. The battery cover includes two cover assemblies and a screw sleeve, distributed along a first direction. Each cover assembly includes a cover body, a terminal post, an insulating ring, and a retaining ring. The cover body has a mounting hole, with a portion of the terminal post disposed within the mounting hole. A stud is provided at one end of the terminal post along the first direction. Both the insulating ring and the retaining ring are sleeved on the terminal post, distributed along the first direction. At least a portion of the retaining ring is disposed within the mounting hole. The retaining ring is welded to the insulating ring and to the cover body. The screw sleeve is disposed between the two cover assemblies, with one end threadedly engaging with the stud on one terminal post and the other end threadedly engaging with the stud on the other terminal post. This battery cover and battery pack can reduce the number of busbars used, improve the space utilization of the battery pack, reduce welding steps, and improve production efficiency.

Description

Technical Field

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

[0002] In the battery field, a battery pack consists of multiple battery cells, with adjacent battery cells connected in series via busbars. In related technologies, a large number of busbars are used for multiple battery cells, affecting the space utilization of the battery pack. Consequently, the welding steps for fixing multiple busbars are numerous, impacting production efficiency. Summary of the Invention

[0003] To address the aforementioned technical problems, embodiments of this application provide a battery cover and a battery pack, which can reduce the number of busbars used, improve the space utilization of the battery pack, reduce welding steps, and improve production efficiency.

[0004] In a first aspect, a battery cover is provided, comprising: Two cover plate assemblies are distributed along a first direction. Each cover plate assembly includes a cover plate body, a pole post, an insulating ring, and a fixing ring. The cover plate body has a mounting hole. A portion of the pole post is disposed within the mounting hole. A stud is provided at one end of the pole post along the first direction. The insulating ring and the fixing ring are both sleeved on the pole post. The insulating ring and the fixing ring are distributed along the first direction. At least a portion of the fixing ring is disposed within the mounting hole. The fixing ring is welded to the insulating ring and welded to the cover plate body. A threaded sleeve is disposed between the two cover plate assemblies, one end of the threaded sleeve is threadedly engaged with the stud on one of the pole posts, and the other end of the threaded sleeve is threadedly engaged with the stud on the other pole post; One of the cover plate assemblies has a terminal for connecting to the positive tab of a battery cell, and the other of the cover plate assemblies has a terminal for connecting to the negative tab of another battery cell.

[0005] According to a first aspect of this application, the pole post is provided with a connecting end face at one end along the first direction, and the stud is provided on the connecting end face; The distance between the threaded sleeve and the connecting end face along the first direction is A, and A satisfies: 0≤A≤20mm.

[0006] According to a first aspect of this application, the length of the threaded section of the sleeve and the same stud along the first direction is B, and B satisfies: 2mm≤B≤50mm.

[0007] According to a first aspect of this application, an insulating region is formed between the two cover plate bodies; a first annular boss is provided in the mounting hole; The fixing ring has an outward flange at one end near the insulating area. The outward flange abuts against the side of the first annular protrusion near the insulating area, and the outward flange is welded to the cover plate body.

[0008] According to a first aspect of this application, the side of the outwardly flange closest to the insulating region is coplanar with the side of the cover plate body closest to the insulating region.

[0009] According to a first aspect of this application, an insulating region is formed between the two cover plate bodies; The fixing ring has a mounting groove on the side near the insulating area, and at least a portion of the insulating ring is disposed in the mounting groove.

[0010] According to a first aspect of this application, the pole post includes: A column, a portion of which is disposed within the mounting hole; The base is distributed along the first direction with the column, and one end of the base is connected to the column; wherein, the insulating ring is sleeved on the column, the insulating ring is locked between the base and the fixing ring, and the stud is provided at the end of the base away from the column.

[0011] According to a first aspect of this application, an insulating region is formed between the two cover plate bodies; The cover plate assembly also includes: A first plastic component is disposed on the side of the cover plate body away from the insulating area. The first plastic component has an assembly part disposed in the mounting hole and sleeved on the column. A portion of the assembly part is disposed between the column and the insulating ring, and another portion of the assembly part is disposed between the column and the fixing ring.

[0012] According to a first aspect of this application, the base has an annular groove on the side near the column, the annular groove surrounding the column, and a portion of the mounting part is located within the annular groove; and / or The assembly part is provided with a barb at one end near the base; the inner side of the insulating ring is provided with a second annular boss, and the side of the second annular boss near the base abuts against the side of the barb near the base.

[0013] Secondly, a battery pack is also provided, comprising: case; Multiple battery cells are disposed within the housing, and each battery cell is provided with a positive electrode tab and a negative electrode tab; As described in the previous embodiment, the battery cover is disposed inside the housing. For two battery cells arranged opposite each other, the terminal of one of the cover assembly is connected to the positive terminal of one of the battery cells, and the terminal of the other cover assembly is connected to the negative terminal of the other battery cell.

[0014] The battery cover and battery pack provided in this application embodiment firstly connect the terminals of two cover assemblies to each other through the threaded engagement of the screw sleeve and the stud. Then, the terminal of one cover assembly is connected to the positive electrode of one battery cell, and the terminal of the other cover assembly is connected to the negative electrode of another battery cell, thereby realizing the series connection of two battery cells. In this way, in the process of connecting two battery cells in series, firstly, it eliminates the need for busbars, reducing the number of busbars required, improving the space utilization of the battery pack, and lowering production costs and the overall weight of the cover assembly; secondly, it reduces the welding process for busbars, improving production efficiency. Secondly, the threaded engagement of the sleeve and stud allows for a detachable connection between the two cover assemblies, facilitating quick assembly and disassembly, as well as convenient categorization, storage, and transportation. Thirdly, by placing the insulating ring on the terminal post, it prevents direct contact between the terminal post and the cover body, thus preventing short circuits. Fourthly, by welding the fixing ring to the insulating ring and then to the cover body, the fixing ring secures the terminal post to the cover body, improving the assembly stability of the terminal post within the mounting hole; furthermore, the weld seal between the fixing ring and the cover body seals the gap between them, preventing foreign objects from entering the battery cell through this gap. 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 battery cover provided for an exemplary embodiment of this application.

[0017] Figure 2 An exploded view of a battery cover provided as an exemplary embodiment of this application.

[0018] Figure 3 A cross-sectional view of a battery cover provided for an exemplary embodiment of this application.

[0019] Figure 4This is a schematic diagram of the structure of a fixing ring provided for an exemplary embodiment of this application.

[0020] Figure 5 This is a schematic diagram of the structure of a pole provided for an exemplary embodiment of this application.

[0021] Figure 6 This is a schematic diagram of the structure of a first plastic part provided for an exemplary embodiment of this application.

[0022] Figure 7 A cross-sectional view of a battery cover provided for another exemplary embodiment of this application.

[0023] Reference numerals: 100-Battery cover; 110-Cover assembly; 111-Cover body; 1111-Mounting hole; 1112-First annular boss; 112-Terminal post; 1121-Connecting end face; 1122-Post; 1123-Base; 11231-Annular groove; 113-Insulating ring; 1131-Second annular boss; 114-Fixing ring; 1141-Outward flange; 1142-Mounting groove; 115-Stud; 116-Insulating area; 117-First plastic part; 1171-Assembly part; 1172-Barb part; 1173-Recessed part; 118-Second plastic part; 119-Fixing plate; 120-Screw sleeve. Detailed Implementation

[0024] 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.

[0025] This application provides a battery pack, which may include a casing, multiple battery cells, and a battery cover 100. Figure 1 As shown in the figure, multiple battery cells and a battery cover 100 are disposed inside the housing. The battery cells are provided with positive and negative tabs at opposite ends. For two battery cells arranged opposite each other, the battery cover 100 can connect the positive and negative tabs of the two battery cells respectively, so as to connect the two battery cells in series.

[0026] Specifically, Figure 1 This is a schematic diagram of the structure of a battery cover provided for an exemplary embodiment of this application. Figure 2 An exploded view of a battery cover provided as an exemplary embodiment of this application. Figure 3 A cross-sectional view of a battery cover provided for an exemplary embodiment of this application. Figures 1 to 3 As shown, the battery cover 100 provided in this embodiment may include two cover assemblies 110 and a screw sleeve 120, with the two cover assemblies 110 along a first direction (refer to...). Figure 1 and Figure 3 The two battery cells are relatively distributed (in the Z-axis direction) and the screw sleeve 120 is disposed between the two cover plate assemblies 110. The two cover plate assemblies 110 are connected by the screw sleeve 120. For two battery cells that are relatively disposed, one cover plate assembly 110 can be connected to the positive electrode of one battery cell, and the other cover plate assembly 110 can be connected to the negative electrode of the other battery cell, thereby connecting the two battery cells in series.

[0027] It should be noted that using two cover plate assemblies 110 to connect two battery cells in series can not only reduce the number of busbars used and production costs, but also reduce the welding process of the busbars and improve work efficiency.

[0028] It should be noted that in this embodiment, the two cover plate assemblies 110 have similar structures; the following description uses one of the cover plate assemblies 110 as an example. Figures 1 to 3 As shown, the cover plate assembly 110 may include a cover plate body 111 and a pole post 112. The cover plate body 111 is provided with a mounting hole 1111, a portion of the pole post 112 is disposed in the mounting hole 1111, and a stud 115 is provided at one end of the pole post 112 along a first direction.

[0029] In practical applications, one of the cover plate assemblies 110 has its terminal 112 connected to the positive tab of one battery cell, while the other cover plate assembly 110 has its terminal connected to the negative tab of another battery cell. One end of the threaded sleeve 120 is threaded into the stud 115 on one of the terminal 112, and the other end of the threaded sleeve 120 is threaded into the stud 115 on the other terminal 112. Thus, through the threaded engagement between the threaded sleeve 120 and the stud 115, the two cover plate assemblies 110 can be connected to each other, thereby enabling the two battery cells to be connected in series.

[0030] It should be noted that in the process of connecting the two cover plate assemblies 110 to each other using the screw sleeve 120, on the one hand, there is no need to use a busbar, which can reduce the number of busbars used, improve the space utilization of the battery pack, and reduce production costs and the overall weight of the cover plate assembly 110; on the other hand, it can reduce the welding process of the busbar and improve production efficiency.

[0031] It should be noted that the two cover plate assemblies 110 are detachably connected by screw sleeves 120, which facilitates the quick assembly and disassembly of the two cover plate assemblies 110, and also facilitates their classification, storage and transportation.

[0032] In one embodiment, there are multiple threaded sleeves 120, and each pole post 112 has multiple studs 115, which are the same number as the number of threaded sleeves 120. The multiple studs 115 and multiple threaded sleeves 120 are threadedly engaged in a one-to-one correspondence, which can improve the connection stability between the two cover plate assemblies 110 and ensure that the current is stably transmitted between the two pole posts 112.

[0033] In one embodiment, the terminal post 112 in one of the cover plate assemblies 110 is a positive terminal post, which is welded to the positive tab of one of the battery cells. The terminal post 112 in the other cover plate assembly 110 is a negative terminal post, which is welded to the negative tab of another battery cell. The positive terminal post and the positive tab are made of aluminum, which can improve the welding quality between the positive terminal post and the positive tab. The negative electrode post consists of an aluminum layer and a copper layer, which are connected. A stud 115 is provided at the end of the aluminum layer near the positive electrode post. The copper layer is welded to the negative electrode lug (made of metallic copper), which can improve the welding quality between the negative electrode post and the negative electrode lug. The threaded sleeve 120 is made of metallic aluminum. One end of the threaded sleeve 120 is threaded with the stud 115 on the positive electrode post, and the other end of the threaded sleeve 120 is threaded with the stud 115 on the aluminum layer. The threaded sleeve 120, the stud 115 on the positive electrode post, and the stud 115 on the aluminum layer are all made of metallic aluminum. In this way, after the three are threaded together, the problem of electrochemical corrosion caused by the use of different metals can be prevented, which can effectively improve the structural strength of the threaded connection and extend the service life.

[0034] In one embodiment, the terminal post 112 in one of the cover plate assemblies 110 is a positive terminal post, which is welded to the positive tab of one of the battery cells. The terminal post 112 in the other cover plate assembly 110 is a negative terminal post, which is welded to the negative tab of another battery cell. The negative terminal post and the negative tab are made of copper, which can improve the welding quality between the negative terminal post and the negative tab. The positive electrode post consists of a copper layer and an aluminum layer, which are connected. A stud 115 is provided at the end of the copper layer near the negative electrode post. The aluminum layer is welded to the positive electrode lug (made of aluminum metal), which can improve the welding quality between the positive electrode post and the positive electrode lug. The threaded sleeve 120 is made of copper metal. One end of the threaded sleeve 120 is threaded with the stud 115 on the negative electrode post, and the other end of the threaded sleeve 120 is threaded with the stud 115 on the copper layer. The threaded sleeve 120, the stud 115 on the negative electrode post, and the stud 115 on the copper layer are all made of copper metal. In this way, after the three are threaded together, the problem of electrochemical corrosion caused by the use of different metals can be prevented, which can effectively improve the structural strength of the threaded connection and extend the service life.

[0035] like Figure 2 and Figure 3As shown, the cover plate assembly 110 may further include an insulating ring 113 and a fixing ring 114, both of which are sleeved on the pole post 112. The insulating ring 113 and the fixing ring 114 are aligned along a first direction (reference). Figure 3 The fixing ring 114 is distributed in the Z-axis direction, at least a portion of which is located in the mounting hole 1111. The fixing ring 114 is welded to the insulating ring 113 and the fixing ring 114 is welded to the cover plate body 111.

[0036] It should be noted that the insulating ring 113 can block the pole post 112 and the cover plate body 111, preventing the pole post 112 from directly contacting the cover plate body 111 and preventing short circuit accidents.

[0037] It should be noted that after the fixing ring 114 is welded to the insulating ring 113 and the fixing ring 114 is welded to the cover plate body 111, the fixing ring 114 can use the insulating ring 113 to fix the pole post 112 to the cover plate body 111, thereby improving the assembly stability of the pole post 112 in the mounting hole 1111.

[0038] It should be noted that after the fixing ring 114 is welded to the cover plate body 111 on the outside, the weld marks between the fixing ring 114 and the cover plate body 111 can seal the gap between the fixing ring 114 and the cover plate body 111, preventing foreign objects from entering the battery cell through the gap between the fixing ring 114 and the cover plate body 111.

[0039] It should be noted that, in practical applications, to improve the welding effect between the retaining ring 114 and the cover plate body 111, the retaining ring 114 can be made of the same metal material as the cover plate body 111. Therefore, to prevent short circuits caused by direct contact between the retaining ring 114 and the pole post 112, the inner wall of the retaining ring 114 and the outer wall of the pole post 112 can be spaced apart. The structure of the insulating assembly part 1171 between the inner wall of the retaining ring 114 and the outer wall of the pole post 112 will be described in detail later.

[0040] In one embodiment, a portion of the retaining ring 114 may be disposed inside the mounting hole 1111, while the other portion may extend outside the mounting hole 1111.

[0041] In one embodiment, all of the retaining rings 114 may be disposed within the mounting holes 1111.

[0042] The battery cover 100 and battery pack provided in this application embodiment firstly connect the terminals 112 of two cover assemblies 110 to each other through the threaded engagement of the sleeve 120 and the stud 115. Then, the terminal 112 of one cover assembly 110 is connected to the positive electrode of one battery cell, and the terminal 112 of the other cover assembly 110 is connected to the negative electrode of another battery cell, thus realizing the series connection of two battery cells. In this way, in the process of realizing the series connection of two battery cells, on the one hand, it is not necessary to use a busbar, which can reduce the number of busbars used, improve the space utilization of the battery pack, and reduce production costs and the overall weight of the cover assembly 110; on the other hand, it can reduce the welding process of the busbar and improve production efficiency. Secondly, the threaded engagement of the sleeve 120 and the stud 115 enables the two cover assemblies 110 to be detachably connected, which can facilitate the quick assembly and disassembly of the two cover assemblies 110, and also facilitate classification, storage and transportation. Thirdly, by sleeved on the terminal 112, the insulating ring 113 can avoid The terminal 112 is in direct contact with the cover plate body 111 to prevent short circuit accidents; fourth, by welding the fixing ring 114 to the insulating ring 113 and welding the fixing ring 114 to the cover plate body 111, on the one hand, the fixing ring 114 can be used to fix the terminal 112 and the cover plate body 111 relatively, thereby improving the assembly stability of the terminal 112 in the mounting hole 1111; on the other hand, the weld between the fixing ring 114 and the cover plate body 111 can be used to seal the gap between the fixing ring 114 and the cover plate body 111, preventing foreign objects from entering the battery cell through the gap between the fixing ring 114 and the cover plate body 111.

[0043] like Figure 3 As shown, pole post 112 is along the first direction (reference) Figure 3 One end of the sleeve 120 (in the Z-axis direction) is provided with a connecting end face 1121, and the connecting end face 1121 is provided with the aforementioned stud 115. The distance between the threaded sleeve 120 and the connecting end face 1121 along the first direction is A.

[0044] It should be noted that if the spacing A is too large, the clearance between the screw sleeve 120 and the connecting end face 1121 will be too large, resulting in an excessively wide area between the two cover plate assemblies 110 along the first direction, occupying a large amount of space in the battery pack along the first direction and affecting the energy density of the battery pack.

[0045] Therefore, in this embodiment of the application, the spacing A is limited to the following range: 0≤A≤20mm. This can effectively improve the problems caused by the excessive spacing A mentioned above.

[0046] In one embodiment, 1mm≤A≤3mm, which can reduce the amount of space between the screw sleeve 120 and the connecting end face 1121, thereby increasing the energy density of the battery pack, and also prevent the screw sleeve 120 from directly contacting the connecting end face 1121, thus preventing the screw sleeve 120 from damaging the connecting end face 1121.

[0047] like Figure 3 As shown, the threaded section of the threaded sleeve 120 and the same stud 115 is along the first direction (reference). Figure 3 The length along the Z-axis is B.

[0048] It should be noted that if the length B is too large, the lengths of the stud 115 and the sleeve 120 need to be increased accordingly, resulting in an excessively wide area between the two cover plate assemblies 110 along the first direction, occupying a large amount of space in the battery pack along the first direction and affecting the energy density of the battery pack; if the length B is too small, it will affect the connection strength between the sleeve 120 and the stud 115, and the sleeve 120 may easily detach from the stud 115.

[0049] Therefore, in this embodiment of the application, the length B is limited to the following range: 2mm≤B≤50mm. This can effectively improve the problems caused by the aforementioned length B being too large or too small.

[0050] In one embodiment, 4mm≤B≤8mm, in this way, while ensuring the connection strength between the threaded sleeve 120 and the stud 115, the area of ​​clearance between the threaded sleeve 120 and the connection end face 1121 can be reduced, effectively improving the energy density of the battery pack.

[0051] like Figure 3 As shown, an insulating region 116 is formed between the two cover plate bodies 111. The insulating region 116 can prevent the two cover plate bodies 111 from directly contacting each other and avoid short circuit accidents.

[0052] like Figure 3 As shown, a first annular boss 1112 is provided inside the mounting hole 1111; correspondingly, Figure 4 This is a schematic diagram of the structure of a fixing ring provided for an exemplary embodiment of this application. Figure 4 As shown, the fixing ring 114 has an outward flange 1141 at one end near the insulating area 116. The outward flange 1141 abuts against the side of the first annular boss 1112 near the insulating area 116, and the outward flange 1141 is welded to the cover plate body 111.

[0053] It should be noted that during the process of assembling the retaining ring 114 into the mounting hole 1111, the outer flange 1141 abuts against the first annular boss 1112. The first annular boss 1112 can position the outer flange 1141, assisting the retaining ring 114 in being installed in the predetermined position and improving the installation accuracy of the retaining ring 114 in the mounting hole 1111. In addition, during the welding process between the outer flange 1141 and the cover plate body 111, the first annular boss 1112 can limit the position of the retaining ring 114, improving the stability of the retaining ring 114 during the welding process, thereby effectively improving the welding quality between the retaining ring 114 and the cover plate body 111.

[0054] like Figure 3 As shown, the side of the outer flange 1141 closest to the insulating area 116 is coplanar with the side of the cover plate body 111 closest to the insulating area 116. This eliminates the problem of welding stress concentration caused by the height difference and avoids cracking at the weld between the outer flange 1141 and the cover plate body 111 due to stress concentration. In addition, welding in the same plane can also effectively improve welding accuracy and efficiency.

[0055] like Figure 3 and Figure 4 As shown, the fixing ring 114 has a mounting groove 1142 on the side near the insulating region 116, and at least a portion of the insulating ring 113 is disposed within the mounting groove 1142. In this way, the thickness space of the fixing ring 114 in the first direction can be fully utilized, the space occupied by the insulating ring 113 outside the mounting groove 1142 can be reduced, which is beneficial to shortening the width of the insulating region 116 in the first direction and improving the energy density.

[0056] In one embodiment, a portion of the insulating ring 113 may be disposed within the mounting groove 1142, while the other portion may extend outside the mounting groove 1142.

[0057] In one embodiment, all of the insulating rings 113 may be disposed within the mounting groove 1142.

[0058] Figure 5 This is a schematic diagram of the pole structure provided for an exemplary embodiment of this application. Figure 5 As shown, the pole post 112 may include a post body 1122 and a base 1123. A portion of the post body 1122 is disposed within the mounting hole 1111. The base 1123 and the post body 1122 are aligned along a first direction (reference). Figure 5 The base 1123 is distributed along the Z-axis direction, and one end of the base 1123 is connected to one end of the column 1122. The end of the base 1123 away from the main body is provided with the aforementioned stud 115.

[0059] like Figure 3As shown, the insulating ring 113 is sleeved on the column 1122 and is locked between the base 1123 and the fixing ring 114. The base 1123 and the fixing ring 114 can limit the insulating ring 113 and prevent the insulating ring 113 from shaking relative to the column 1122.

[0060] In one embodiment, the contact point between the insulating ring 113 and the base 1123 is located outside the mounting hole 1111. Welding the insulating ring 113 to the base 1123 can fix the insulating ring 113 to the base 1123, thereby fixing the insulating ring 113 to the column 1122.

[0061] In one embodiment, the insulating ring 113 is made of ceramic material, which has both good insulation properties and good weldability.

[0062] like Figure 3 and Figure 5 As shown, the projection of the column 1122 onto the surface of the base 1123 along the first direction is completely within the outer contour of the base 1123. In this way, when the insulating ring 113 is fitted onto the column 1122, the insulating ring 113 can easily abut against the base 1123.

[0063] Figure 6 This is a schematic diagram of the structure of a first plastic part provided for an exemplary embodiment of this application. Figure 2 , Figure 3 and Figure 6 As shown, the cover plate assembly 110 may also include a first plastic part 117. The first plastic part 117 is disposed on the side of the cover plate body 111 away from the insulating area 116. The first plastic part 117 is provided with an assembly part 1171, which is disposed in the mounting hole 1111 and is sleeved on the column 1122.

[0064] It should be noted that the first plastic part 117 can block the cover body 111 from the end of the battery cell, preventing the cover body 111 from directly contacting the end of the battery cell and avoiding short circuit accidents.

[0065] It should be noted that a portion of the assembly part 1171 is located between the column 1122 and the insulating ring 113. In practical applications, the assembly part 1171 is injection molded, and a portion of the assembly part 1171 can fill the gap between the column 1122 and the insulating ring 113, thereby improving the assembly stability between the insulating ring 113 and the column 1122. Additionally, another portion of the assembly part 1171 is located between the column 1122 and the retaining ring 114. The assembly part 1171 can isolate the column 1122 and the retaining ring 114, preventing direct contact between them and avoiding short circuits.

[0066] like Figure 3 and Figure 5 As shown, the base 1123 has an annular groove 11231 on the side near the column 1122. The annular groove 11231 surrounds the column 1122, and a portion of the assembly part 1171 is located within the annular groove 11231. In this way, the thickness space of the base 1123 in the first direction can be fully utilized, reducing the space occupied by the assembly part 1171 outside the annular groove 11231. This is beneficial for shortening the width of the insulation area 116 in the first direction and improving the energy density of the battery pack.

[0067] It should be noted that the annular groove 11231 can also reduce the amount of material and weight of the base 1123, thereby reducing the overall weight of the battery cover 100.

[0068] like Figure 3 and Figure 6 As shown, the assembly part 1171 has a barb portion 1172 at one end near the base 1123, and a second annular boss 1131 is provided on the inner side of the insulating ring 113. The side of the second annular boss 1131 near the base 1123 abuts against the side of the barb portion 1172 near the base 1123. In this way, the second annular boss 1131 can restrict the assembly part 1171 from disengaging from the mounting hole 1111 through the barb portion 1172, thereby improving the assembly stability of the assembly part 1171 within the mounting hole 1111.

[0069] In one embodiment, the barb portion 1172 may include a third annular boss that abuts against the second annular boss 1131.

[0070] In one embodiment, the barb portion 1172 may include a plurality of protrusions that are spaced apart circumferentially along the assembly portion 1171 and abut against the second annular boss 1131.

[0071] like Figure 2 and Figure 3 As shown, the cover plate assembly 110 may also include a fixing plate 119, which is located on the side of the first plastic part 117 away from the insulating area 116 and is sleeved on the column 1122.

[0072] In practical applications, the fixing plate 119 can be used to connect the positive or negative tabs of a battery cell. Compared to the pillar 1122, the fixing plate 119 has a larger weldable area, which can improve the problems of spatter and uneven penetration during the welding process, and improve the welding quality and reliability.

[0073] like Figure 3 and Figure 6 As shown, the first plastic part 117 has a recess 1173 on the side near the cover plate body 111, and a portion of the fixing ring 114 is located in the recess 1173.

[0074] It should be noted that to ensure the structural strength of the retaining ring 114, the thickness of the retaining ring 114 along the first direction must meet the requirements. Therefore, after the retaining ring 114 is installed into the mounting hole 1111, one end of the retaining ring 114 away from the insulating area 116 may protrude from the cover plate body 111. In this case, the recess 1173 on the first plastic part 117 can avoid the portion of the retaining ring 114 protruding from the cover plate body 111, preventing the first plastic part 117 from being lifted or damaged by the retaining ring 114. The other parts of the first plastic part 117 can still maintain a close fit with the cover plate body 111, ensuring good insulation performance.

[0075] In one embodiment, the recess 1173 can be formed by creating a groove on the side of the first plastic part 117 near the cover plate body 111.

[0076] In one embodiment, a recess 1173 can also be formed on the side of the first plastic part 117 near the cover plate body 111 by stamping.

[0077] Figure 7 A cross-sectional view of a battery cover provided for another exemplary embodiment of this application. (See figure) Figure 7 As shown, the cover plate assembly 110 may also include a second plastic part 118. The second plastic part 118 is disposed on the side of the cover plate body 111 near the insulating area 116. The second plastic part 118 is sleeved on the insulating ring 113 and the base 1123. The second plastic part 118 can insulate and block the two cover plate bodies 111 to prevent the risk of short circuit between the two cover plate bodies 111.

[0078] In one embodiment, each of the two cover plate bodies 111 has a second plastic component 118 on the side near the insulating region 116. The two second plastic components 118 are positioned along a first direction (reference...) Figure 7 The sum of the thicknesses along the Z-axis direction is equal to the width of the insulating region 116 along the first direction. In this way, the two second plastic parts 118 can not only serve as insulation but also support the two cover plate bodies 111, reducing the risk of local deformation of the cover plate bodies 111.

[0079] In one embodiment, each of the two cover plate bodies 111 has a second plastic component 118 on the side near the insulating region 116. The sum of the thicknesses of the two second plastic components 118 along the first direction is less than the width of the insulating region 116 along the first direction, thus the two second plastic components 118 provide insulation. Based on this, a support member can be provided between the two second plastic components 118 to support the two cover plate bodies 111. Specifically, the support member may include a support block, a support frame, a telescopic rod, etc.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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 battery cover plate, characterized by, include: Two cover plate assemblies are distributed along a first direction. Each cover plate assembly includes a cover plate body, a pole post, an insulating ring, and a fixing ring. The cover plate body has a mounting hole. A portion of the pole post is disposed within the mounting hole. A stud is provided at one end of the pole post along the first direction. The insulating ring and the fixing ring are both sleeved on the pole post. The insulating ring and the fixing ring are distributed along the first direction. At least a portion of the fixing ring is disposed within the mounting hole. The fixing ring is welded to the insulating ring and welded to the cover plate body. A threaded sleeve is disposed between the two cover plate assemblies, one end of the threaded sleeve is threadedly engaged with the stud on one of the pole posts, and the other end of the threaded sleeve is threadedly engaged with the stud on the other pole post; One of the cover plate assemblies has a terminal for connecting to the positive tab of a battery cell, and the other of the cover plate assemblies has a terminal for connecting to the negative tab of another battery cell.

2. The battery cover plate of claim 1, wherein, The pole post is provided with a connecting end face at one end along the first direction, and the stud is provided on the connecting end face; The distance between the threaded sleeve and the connecting end face along the first direction is A, and A satisfies: 0≤A≤20mm.

3. The battery cover plate of claim 1, wherein, The length of the threaded section of the sleeve and the same stud along the first direction is B, and B satisfies: 2mm≤B≤50mm.

4. The battery cover according to any one of claims 1 to 3, characterized in that, An insulating area is formed between the two cover plate bodies; a first annular boss is provided in the mounting hole; The fixing ring has an outward flange at one end near the insulating area. The outward flange abuts against the side of the first annular protrusion near the insulating area, and the outward flange is welded to the cover plate body.

5. The battery cover according to claim 4, characterized in that, The side of the outward-flared edge closest to the insulating area is coplanar with the side of the cover plate body closest to the insulating area.

6. The battery cover according to any one of claims 1 to 3, characterized in that, An insulating area is formed between the two cover plate bodies; The fixing ring has a mounting groove on the side near the insulating area, and at least a portion of the insulating ring is disposed in the mounting groove.

7. The battery cover according to any one of claims 1 to 3, characterized in that, The pole includes: A column, a portion of which is disposed within the mounting hole; The base is distributed along the first direction with the column, and one end of the base is connected to the column; wherein, the insulating ring is sleeved on the column, the insulating ring is locked between the base and the fixing ring, and the stud is provided at the end of the base away from the column.

8. The battery cover according to claim 7, characterized in that, An insulating area is formed between the two cover plate bodies; The cover plate assembly also includes: A first plastic component is disposed on the side of the cover plate body away from the insulating area. The first plastic component has an assembly part disposed in the mounting hole and sleeved on the column. A portion of the assembly part is disposed between the column and the insulating ring, and another portion of the assembly part is disposed between the column and the fixing ring.

9. The battery cover according to claim 8, characterized in that, The base has an annular groove on the side near the column, the annular groove surrounding the column, and a portion of the assembly is located within the annular groove; and / or The assembly part is provided with a barb at one end near the base; the inner side of the insulating ring is provided with a second annular boss, and the side of the second annular boss near the base abuts against the side of the barb near the base.

10. A battery pack, characterized in that, include: case; Multiple battery cells are disposed within the housing, and each battery cell is provided with a positive electrode tab and a negative electrode tab; The battery cover plate as described in any one of claims 1 to 9 is disposed within the housing, wherein for two battery cells disposed opposite to each other, the terminal post of one of the cover plate assemblies is connected to the positive terminal tab of one of the battery cells, and the terminal post of the other cover plate assembly is connected to the negative terminal tab of the other battery cell.

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