Battery cover plate and battery

Abstract

The utility model provides a battery cover plate and a battery, and relates to the technical field of batteries, the battery cover plate comprises a cover plate body and a pole structure, the pole structure comprises a pole body, a connecting sheet, a welding block and a middle insulating part; the connecting piece is connected to one end of the pole body, the welding block and the connecting piece are arranged at an interval, and at least part of the middle insulating part is connected between the connecting piece and the welding block so as to fixedly connect the connecting piece and the welding block; the welding block is used for being welded to the cover plate body. One end, far away from the connecting sheet, of the pole body of the pole structure can penetrate through the cover plate body and is riveted and fixed with the cover plate body through the riveting block as in the prior art, and the welding block of the pole structure can be welded and fixed with the cover plate body, so that other positions of the connecting sheet are indirectly fixed with the cover plate body; the structural strength of the battery cover plate can be ensured to be higher, and the safety and reliability of the battery are improved.

Description

Technical Field

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

[0002] In recent years, the rapid development of the new energy vehicle industry has directly driven the rapid progress of related industries such as lithium-ion batteries. As the core power source of new energy vehicles, the performance, safety, reliability, and cost of lithium-ion batteries directly affect the competitiveness of the entire vehicle, leading to increasingly higher demands. For example, the requirements for battery energy density for ultra-long driving range, the requirements for battery internal resistance and heat generation for ultra-fast charging speed, and the control of battery safety, reliability, and cost have always been issues of great concern. Currently, power batteries generally adopt a square hard-shell structure, which mainly includes conventional square-shell batteries with terminals protruding from the top and long-blade and short-blade batteries with terminals protruding from the side. Regardless of the structural form, they are basically composed of several key parts: an aluminum shell, a cover plate, and the electrode core. Among them, the design innovation of the cover plate structure has an extremely important impact on the performance, safety, and cost of the battery, and it, together with the innovation of battery chemical materials, drives the progress of battery technology.

[0003] Existing battery covers mainly consist of a cover body (generally referring to a sheet of bare aluminum made of metal), terminals, connecting tabs, explosion-proof valves, seals, and insulation components. The cover body is typically designed with through holes. One end of the terminal passes through the through hole and is connected to the cover body by welding or riveting. Welding usually requires a welding aluminum ring, while riveting uses a riveting block. Additionally, the terminal and connecting tab are connected by friction welding or by using a single, integrated terminal. Finally, the connecting tab is insulated and secured to the metal cover body by a plastic insert. The connecting tab's function is to connect the terminal and the tab, thereby conducting current. In existing technologies, the connecting piece and the cover plate body are usually not fixed together. They are only indirectly connected to the cover plate body by riveting the end of the terminal post. However, this structure is not strong and will affect the safety and reliability of the battery. In particular, for friction-welded terminals (connecting pieces and terminals are connected by friction welding), under some vibration conditions, the corresponding positions of the connecting piece and the cover plate body are prone to slight displacement, which will lead to slight displacement of the connection surface between the connecting piece and the terminal post, and may cause the terminal post and connecting piece to break. Utility Model Content

[0004] The present invention aims to solve the problem that the connecting piece in the battery cover is prone to breakage between itself and the terminal post.

[0005] To address the aforementioned problems, this utility model provides a battery cover plate, comprising a cover plate body and a terminal post structure. The terminal post structure includes a terminal post body, a connecting piece, a welding block, and an intermediate insulating component. The connecting piece is connected to one end of the terminal post body, the welding block is spaced apart from the connecting piece, and at least a portion of the intermediate insulating component is connected between the connecting piece and the welding block to fix the connecting piece and the welding block together. The welding block is used for welding to the cover plate body.

[0006] This utility model provides a battery cover plate. The electrode post structure is an assembly that is already an "integral" before being assembled with the cover plate body and other components to form the battery cover plate. In this integral structure of the electrode post structure, the relationship between the connecting piece and the electrode post body can be an integral structure or a friction-welded structure, as in the prior art. The intermediate insulating component connects and fixes the connecting piece and the welding block together to form the integral structure of the electrode post structure. In addition, since the welding block is used to weld to the cover plate body, the connection between the connecting piece and the welding block through the intermediate insulating component can keep the connecting piece and the cover plate body insulated, thus preventing the electrode core from being electrically connected to the cover plate body. In this electrode structure, the connecting piece is not only connected to one end of the electrode body, but other positions of the connecting piece are also connected and fixed to the welding block through an intermediate insulating component. Thus, when assembling to form the battery cover, the end of the electrode body away from the connecting piece can pass through the cover body and be riveted to the cover body through the riveting block, just like in the prior art. The welding block of the electrode structure can be welded to the cover body, thereby achieving indirect fixation between the other positions of the connecting piece and the cover body. This ensures higher structural strength of the battery cover, improves battery safety and reliability, and even under some vibration conditions, the corresponding positions of the connecting piece and the cover body will not experience slight displacement, thus preventing slight displacement of the connection surface between the connecting piece and the electrode body and avoiding breakage between the electrode body and the connecting piece.

[0007] Furthermore, two welding blocks are provided, and the connecting piece is located between the two welding blocks along the length direction of the connecting piece.

[0008] Furthermore, the intermediate insulating component is an overmolded component, which is used for injection molding between the connecting piece and the welding block.

[0009] Furthermore, the welding block has a first side facing away from the cover plate body, the connecting piece has a first side facing away from the cover plate body, the first side facing away from the cover plate body is closer to the cover plate body than the first side facing away from the cover plate body, and part of the overmolded component is wrapped around the first side facing away from the cover plate body.

[0010] Furthermore, the welding block has a second side facing the cover plate body, the connecting piece has a second side facing the cover plate body, the second side of the block is closer to the cover plate body than the second side of the piece, and a portion of the overmolded part is wrapped around the first side of the piece.

[0011] Furthermore, the encapsulated component forms a first encapsulation layer on the first side of the sheet, and the first encapsulation layer and the electrode body form a sealing groove; the battery cover also includes a sealing ring, the sealing ring including a sealing ring body and a sealing ring annular boss disposed around one end of the sealing ring body, the sealing ring body is used to be sleeved on the electrode body, and the sealing ring annular boss is used to be placed in the sealing groove.

[0012] Furthermore, the welding block includes a welding block body and a welding protrusion. In the length direction of the connecting piece, the welding protrusion is disposed on the side of the welding block body away from the connecting piece, and the side of the welding protrusion facing the cover plate body is flush with the side of the welding block body facing the cover plate body.

[0013] Furthermore, the battery cover also includes a lower plastic, which has a through groove. The lower plastic is sleeved on the outer periphery of the connecting piece of the electrode structure through the through groove, and abuts against the cover body and the welding protrusion along the thickness direction of the cover body. The lower plastic is engaged with the cover body.

[0014] Furthermore, the cover plate body has a recessed portion on the side facing the connecting piece, and at least a portion of at least one of the intermediate insulating member, the welding block, and the connecting piece is located in the recessed portion.

[0015] This utility model also provides a battery, including the battery cover as described above.

[0016] Since the technological improvements and beneficial effects of the battery are at least the same as those of the battery cover, the battery will not be described in detail here. Attached Figure Description

[0017] Figure 1 This is an exploded view of the battery cover according to an embodiment of the present invention;

[0018] Figure 2 This is a cross-sectional view of the first pole post structure according to an embodiment of the present utility model;

[0019] Figure 3 A cross-sectional view of the welding block according to an embodiment of this utility model;

[0020] Figure 4 This is a cross-sectional view of the battery cover plate according to an embodiment of the present utility model.

[0021] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0022] Figure 6 This is a cross-sectional view of the second pole structure according to an embodiment of the present utility model.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Cover plate body; 11. Aluminum sheet through hole; 12. Recessed part; 2. Pole post structure; 21. Pole post body; 22. Connecting piece; 221. First positioning groove; 23. Rubber-coated part; 231. First positioning part; 232. Second positioning part; 24. Welding block; 241. Welding block body; 2411. Second positioning groove; 242. Welding protrusion; 25. Sealing groove; 3. Sealing ring; 31. Sealing ring body; 32. Sealing ring annular protrusion; 4. Lower plastic; 41. Through groove; 42. Buckle; 5. Riveting block; 6. Upper plastic. Detailed Implementation

[0025] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0026] In the description of this utility model, it should be understood that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] In the attached diagram, the Z-axis represents the vertical direction, i.e., up and down, with the positive direction of the Z-axis representing up and the negative direction representing down. The Y-axis represents the left and right direction, with the positive direction of the Y-axis representing the left and the negative direction representing the right. The X-axis represents the longitudinal direction, i.e., forward and backward, with the positive direction of the X-axis representing forward and the negative direction representing backward. It should be noted that the aforementioned representations of the Z, Y, and X axes are merely for ease of description and simplification of the present invention, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0028] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this utility model are only used to distinguish different devices, modules, or units, and are not used to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0029] It should be noted that the terms "one" and "multiple" used in this utility model are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0030] See Figure 1-2 and Figure 4-5 A battery cover according to an embodiment of the present invention includes a cover body 1 and a terminal post structure 2. The terminal post structure 2 includes a terminal post body 21, a connecting piece 22, a welding block 24 and an intermediate insulating member. The connecting piece 22 is connected to one end of the terminal post body 21. The welding block 24 is spaced apart from the connecting piece 22. At least a portion of the intermediate insulating member is connected between the connecting piece 22 and the welding block 24 to fix the connecting piece 22 and the welding block 24. The welding block 24 is used to weld to the cover body 1.

[0031] In this embodiment, the battery cover plate has a terminal structure 2 that is an assembly. Before being assembled with the cover plate body 1 and other components to form the battery cover plate, it is already an "integral". In this integral structure of the terminal structure 2, the relationship between the connecting piece 22 and the terminal body 21 can be an integral structure or a friction-welded structure, as in the prior art. The intermediate insulating component connects and fixes the connecting piece 22 and the welding block 24 together, thereby forming the integral structure of the terminal structure 2. In addition, since the welding block 24 is used to weld to the cover plate body 1, the connection between the connecting piece 22 and the welding block 24 through the intermediate insulating component can keep the connecting piece 22 insulated from the cover plate body 1, thus preventing the electrode core from being electrically connected to the cover plate body 1.

[0032] In this electrode structure 2, the connecting piece 22 is not only connected to one end of the electrode body 21, but other positions of the connecting piece 22 are also connected and fixed to the welding block 24 through an intermediate insulating component. Thus, when assembling to form a battery cover, the end of the electrode body 21 of the electrode structure 2 away from the connecting piece 22 can pass through the cover body 1 and be riveted and fixed to the cover body 1 through the riveting block 5, just like in the prior art. The welding block 24 of the electrode structure 2 can be welded and fixed to the cover body 1, thereby achieving indirect fixation between the other positions of the connecting piece 22 and the cover body 1. This ensures higher structural strength of the battery cover, improves battery safety and reliability, and even under some vibration conditions, the corresponding positions of the connecting piece 22 and the cover body 1 will not experience slight displacement, thus preventing slight displacement of the connection surface between the connecting piece 22 and the electrode body 21, avoiding the breakage problem between the electrode body 21 and the connecting piece 22.

[0033] It should be noted that, as Figure 1 , Figure 4-5 As shown, the battery cover can include a riveting block 5 and an upper plastic 6, similar to existing technologies. When assembling the battery cover using the terminal post structure 2, the cover body 1, the riveting block 5, and the upper plastic 6 in this embodiment, the cover body 1, the upper plastic 6, and the riveting block 5 are stacked sequentially from bottom to top. Then, the top end of the terminal post body 21 in the terminal post structure 2 (that is, the end away from the connecting piece 22) passes sequentially from bottom to top through the aluminum sheet through hole 11 of the cover body 1, the through hole of the upper plastic 6, and the through hole of the riveting block 5 until the welding block 24 abuts against the lower side of the cover body. Then, the top end of the terminal post body 21 can be riveted onto the riveting block 5 (the top end of the terminal post body 21 will be flattened to form a terminal post boss for limiting the position), and then the welding block 24 is welded and fixed to the cover body 1. Among them, the plastic 6 between the riveting block 5 and the cover plate body 1 can ensure that the riveting block 5 and the cover plate body 1 are insulated; the intermediate insulating component in the pole structure 2 not only serves to connect and fix the connecting piece 22 and the welding block 24, but also serves to insulate the two, preventing the connecting piece 22 from short-circuiting with the cover plate body 1 through the welding block 24.

[0034] See Figure 2 , Figure 4-5 Optionally, two welding blocks 24 are provided, with the connecting piece 22 located between the two welding blocks 24 along the length direction of the connecting piece 22.

[0035] In this embodiment, both ends of the connecting piece 22 are indirectly connected to a welding block 24 through an intermediate insulating member. Thus, after the two welding blocks 24 are welded and fixed to the cover plate body 1, both ends of the connecting piece 22 are fixed by the welding blocks 24, resulting in higher stability. It can be understood that the middle position of the connecting piece 22 is connected to the bottom end of the pole body 21.

[0036] Furthermore, along the length of the connecting piece 22, the connecting piece 22 is located between the two welding blocks 24. That is, the two welding blocks 24 are located outside the two ends of the length of the connecting piece 22. In this way, the connecting piece 22 will not hinder the welding blocks 24 from being welded and fixed to the cover plate body 1. For example, the welding blocks 24 can be welded to the cover plate body 1 from below by laser welding.

[0037] See Figure 1-2 Optionally, the intermediate insulating component is a rubber-coated component 23, which is injection molded between the connecting piece 22 and the welding block 24.

[0038] In this embodiment, the intermediate insulating component in the pole structure 2 is specifically a rubber-coated component 23. Before the pole structure 2 is formed as a whole, the pole body 21 and the connecting piece 22 can be placed in the injection mold, and then two welding blocks 24 can be placed in the injection mold, with the welding blocks 24 and the connecting piece 22 arranged opposite to each other. Then, glue can be injected into the injection mold. After the glue solidifies, the rubber-coated component 23 is formed. The rubber-coated component 23 connects and fixes the connecting piece 22 and the welding block 24 together through adhesive force.

[0039] See Figure 2 and Figure 5 Optionally, the welding block 24 has a first side facing away from the cover plate body 1, and the connecting piece 22 has a first side facing away from the cover plate body 1. The first side of the block is closer to the cover plate body 1 than the first side of the piece, and part of the rubber-coated part 23 is wrapped around the first side of the block.

[0040] In this embodiment, the first side of the block refers to the lower side of the welded block 24 shown in the figure, and the first side of the piece refers to the lower side of the connecting piece 22 shown in the figure. The lower side of the connecting piece 22 needs to be welded to the tab (not shown) inside the battery casing; therefore, the lower side of the connecting piece 22 is not wrapped by the overmolding part 23. Since the lower side of the welded block 24 is closer to the cover plate body 1 than the lower side of the connecting piece 22, the adhesive can enter the space under the welded block 24 after entering between the welded block 24 and the connecting piece 22. This allows the solidified overmolding part 23 to not only be located between the welded block 24 and the connecting piece 22, but also under the welded block 24 to wrap its lower side. The portion of the overmolding part 23 located under the welded block 24 can support the welded block 24, improving the overall stability of the electrode structure 2. Furthermore, it can prevent the welded block 24 from contacting the tab, providing insulation between the welded block 24 and the tab.

[0041] See Figure 2 and Figure 5Optionally, the welding block 24 has a second side facing the cover plate body 1, the connecting piece 22 has a second side facing the cover plate body 1, the second side of the block is closer to the cover plate body 1 than the second side of the piece, and part of the adhesive-coated part 23 is wrapped around the first side of the piece.

[0042] In this embodiment, the second side of the block refers to the upper side of the welded block 24 shown in the figure, and the second side of the piece refers to the upper side of the connecting piece 22 shown in the figure. As mentioned above, since the lower side of the connecting piece 22 needs to be welded to the electrode tab, the lower side of the connecting piece 22 is not wrapped by the overmolded part 23. In order to increase the bonding area between the overmolded part 23 and the connecting piece 22 to improve the stability of the connection, after the adhesive enters between the welded block 24 and the connecting piece 22, it can also enter the upper space of the connecting piece 22. Thus, the solidified overmolded part 23 is not only located between the welded block 24 and the connecting piece 22, but also located on the upper side of the welded block 24 to wrap the upper side of the connecting piece 22, thereby increasing the bonding area.

[0043] In this design, the upper side of the welding block 24 is closer to the cover plate body 1 than the upper side of the connecting piece 22. Thus, the portion of the overmolded part 23 located above the connecting piece 22 (referred to as the first overmolded layer) can be flush with the upper side of the welding block 24. When the terminal post structure 2 is subsequently assembled with the cover plate body 1, the upper side of the welding block 24 and the first overmolded layer can simultaneously abut against the lower side of the cover plate body 1, further improving the overall stability of the battery cover. Furthermore, the first overmolded layer can prevent the connecting piece 22 from contacting the cover plate body 1, ensuring insulation between the connecting piece 22 and the cover plate body 1.

[0044] See Figure 1-2 Optionally, the overmolded component 23 forms a first overmolded layer on the first side of the sheet, and the first overmolded layer and the electrode body 21 form a sealing groove 25; as shown Figure 1 and Figure 5 As shown, the battery cover also includes a sealing ring 3. The sealing ring 3 includes a sealing ring body 31 and a sealing ring annular boss 32 surrounding one end of the sealing ring body 31. The sealing ring body 31 is used to fit onto the terminal body 21, and the sealing ring annular boss 32 is used to be placed in the sealing groove 25.

[0045] In this embodiment, the first adhesive layer does not completely cover the entire upper side of the connecting piece 22. The area of ​​the upper side of the connecting piece 22 near the pole body 21 is not covered by the first adhesive layer. In this area, the first adhesive layer and the pole body 21 can form a sealing groove 25, and the sealing ring 3 can cooperate with it. Specifically, when assembling the battery cover, the cover body 1, the upper plastic 6, and the rivet block 5 are stacked sequentially from bottom to top. Then, the sealing ring 3 is fitted onto the terminal body 21 until the sealing ring annular protrusion 32 is placed in the sealing groove 25. Then, the top of the terminal body 21 in the terminal structure 2 passes through the aluminum sheet through hole 11, the through hole of the upper plastic 6, and the through hole of the rivet block 5 sequentially from bottom to top (during this process, the sealing ring body 31 is inserted into the aluminum sheet through hole 11 to insulate the terminal structure 2 from the cover body 1), until the welding block 24, the first rubber coating layer, and the sealing ring annular protrusion 32 abut against the lower side of the cover body 1. Then, the top of the terminal body 21 can be riveted onto the rivet block 5, and then the welding block 24 can be welded and fixed to the cover body 1.

[0046] The sealing ring annular boss 32 abuts against the lower side of the cover plate body 1, which can axially limit the sealing ring 3 and prevent the sealing ring 3 from moving up and down along the pole body 21. The sealing groove 25 provides clearance and installation space for the sealing ring annular boss 32, so that the first rubber layer and the sealing ring annular boss 32 can abut against the lower side of the cover plate body 1 at the same time, ensuring structural compactness and improving assembly reliability.

[0047] Optionally, in order to increase the bonding area between the rubber-coated part 23 and the welding block 24, and also to increase the bonding area between the rubber-coated part 23 and the connecting piece 22, the rubber-coated part 23 is also wrapped around the front and rear sides of the welding block 24 and the front and rear sides of the connecting piece 22. That is, the rubber-coated part 23 can also wrap around the welding block 24 and the two end surfaces of the connecting piece 22 along the width direction of the connecting piece 22.

[0048] Optionally, in order to improve the adhesion between the overmolded part 23 and the welding block 24, and also to improve the adhesion between the overmolded part 23 and the connecting piece 22, the contact surface between the welding block 24 and the overmolded part 23 is uniformly provided with multiple nano-scale microporous structures, and the contact surface between the connecting piece 22 and the overmolded part 23 is also uniformly provided with multiple nano-scale microporous structures. The adhesive liquid before the overmolded part 23 solidifies will enter these microporous structures. After solidification, part of the overmolded part 23 will form nano-scale particles in the microporous structures, which can ultimately improve the adhesion and enhance the stability of the connection between the three.

[0049] Optionally, see Figure 6To ensure the stability of the connection between the welding block 24, the rubber-coated part 23, and the connecting piece 22, a first positioning groove 221 can be provided on the left and right sides of the connecting piece 22. The rubber-coated part 23 will form a first positioning part 231 in the first positioning groove 221. A second positioning groove 2411 is provided on the side of the welding block 24 facing the connecting piece 22. The rubber-coated part 23 will form a second positioning part 232 in the second positioning groove 2411. Thus, the stability of the connection between the welding block 24, the rubber-coated part 23, and the connecting piece 22 is ensured by the cooperation of the first positioning part 231 with the first positioning groove 221 and the cooperation of the second positioning part 232 with the second positioning groove 2411.

[0050] See Figure 2-3 and Figure 5 Optionally, the welding block 24 includes a welding block body 241 and a welding protrusion 242. In the length direction of the connecting piece 22, the welding protrusion 242 is disposed on the side of the welding block body 241 away from the connecting piece 22, and the side of the welding protrusion 242 facing the cover plate body 1 is flush with the side of the welding block body 241 facing the cover plate body 1.

[0051] In this embodiment, the cross-section of the welding block 24 is L-shaped. Specifically, the welding block 24 includes a welding block body 241 and a welding protrusion 242. The welding protrusion 242 is located on the side of the welding block body 241 away from the connecting piece 22, and the side of the welding protrusion 242 facing the cover plate body 1 is flush with the side of the welding block body facing the cover plate body 1. Thus, during the assembly of the battery cover plate, the first adhesive layer in the electrode structure 2, the welding block body 241, and the welding protrusion 242 will all abut against the lower side of the cover plate body 1. The lower side of the welding block body 241 has a portion of the adhesive layer 23, while the lower side of the welding protrusion 242 does not have an adhesive layer 23. Therefore, the welding protrusion 242 can be laser welded to the cover plate body 1 from the lower side of the welding protrusion 242, making the welding operation easier.

[0052] See Figure 1 and Figure 5 Optionally, the battery cover also includes a lower plastic 4, which has a through groove 41. The lower plastic 4 is sleeved on the outer periphery of the connecting piece 22 of the pole post structure 2 through the through groove 41, and abuts against the cover body 1 and the welding protrusion 242 along the thickness direction of the cover body 1. The lower plastic 4 is snapped into the cover body 1.

[0053] In this embodiment, during the assembly of the battery cover assembly, after the terminal post structure 2 is installed and fixed, the lower plastic 4 can be fitted onto the outer periphery of the connecting piece 22 of the terminal post structure 2 from bottom to top through the through groove 41, until it vertically abuts against the welding protrusion 242 and the cover body 1, thus achieving the snap-fit ​​between the lower plastic 4 and the cover body 1. After the lower plastic 4 snaps into the cover body 1, it can provide support for the welding block 24, further improving the stability of the terminal post structure 2 and even the entire battery cover; in addition, the through holes of the lower plastic 4 can also limit the terminal post structure 2 inside in the front-back and left-right directions, which can further improve the stability of the terminal post structure 2 and even the entire battery cover; furthermore, the area of ​​the cover body 1 not covered by the rubber-coated part 23 can also be insulated by the lower plastic 4, preventing the area of ​​the cover body 1 not covered by the rubber-coated part 23 from conducting electricity with the internal structure of the battery casing.

[0054] Among them, such as Figure 1 As shown, optionally, the lower plastic 4 has multiple protruding clips 42, which engage with slots (not shown) on the cover plate body 1 to fix the lower plastic 4 to the cover plate body 1. The clips 42 can be circular clips to facilitate engagement with the slots on the cover plate body 1.

[0055] See Figure 5 The cover plate body 1 has a recess 12 on the side facing the connecting piece 22, and at least a portion of at least one of the three components, namely the intermediate insulating component, the welding block 24 and the connecting piece 1, is located in the recess 12.

[0056] In this embodiment, a recess 12 is provided on the lower side of the cover body 1. After the battery cover assembly is assembled, as shown... Figure 5 As shown, at least a portion of the welding block 24 and at least a portion of the intermediate insulating component (coated component 23) are located in the recess 12, which can improve the integration of the electrode structure 2 and the cover plate body 1, reduce the space occupied inside the battery casing, thereby improving the space utilization rate of the electrode core inside the battery casing and improving the battery energy density; in addition, the design of the recess 12 of the cover plate body 1 can also reduce the weight of the cover plate body 1, achieving weight reduction and cost reduction.

[0057] Another embodiment of this utility model also provides a battery, including the battery cover as described above.

[0058] Since the technological improvements and beneficial effects of the battery are at least the same as those of the battery cover, the battery will not be discussed further.

[0059] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" and "second" may explicitly or implicitly include at least one of those features.

[0060] Although the present invention has been disclosed above, its protection scope is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the protection scope of the present invention.

Claims

1. A battery cover, characterized in that, The device includes a cover plate body (1) and a pole structure (2). The pole structure (2) includes a pole body (21), a connecting piece (22), a welding block (24), and an intermediate insulating member. The connecting piece (22) is connected to one end of the pole body (21). The welding block (24) is spaced apart from the connecting piece (22). At least a portion of the intermediate insulating member is connected between the connecting piece (22) and the welding block (24) to fix the connecting piece (22) and the welding block (24) together. The welding block (24) is used to weld to the cover plate body (1).

2. The battery cover according to claim 1, characterized in that, Two welding blocks (24) are provided, and the connecting piece (22) is located between the two welding blocks (24) in the length direction of the connecting piece (22).

3. The battery cover according to claim 2, characterized in that, The intermediate insulating component is a rubber-coated component (23), which is used for injection molding between the connecting piece (22) and the welding block (24).

4. The battery cover according to claim 3, characterized in that, The welding block (24) has a first side facing away from the cover plate body (1), the connecting piece (22) has a first side facing away from the cover plate body (1), the first side facing away from the cover plate body (1) is closer to the cover plate body (1) than the first side facing away from the connecting piece, and part of the rubber-coated part (23) is wrapped around the first side facing away from the block.

5. The battery cover according to claim 4, characterized in that, The welding block (24) has a second side facing the cover plate body (1), the connecting piece (22) has a second side facing the cover plate body (1), the second side of the block is closer to the cover plate body (1) than the second side of the piece, and part of the overmolded part (23) is wrapped around the first side of the piece.

6. The battery cover according to claim 5, characterized in that, The encapsulated component (23) forms a first encapsulated layer on the first side of the sheet, and the first encapsulated layer and the electrode body (21) form a sealing groove (25); the battery cover also includes a sealing ring (3), the sealing ring (3) includes a sealing ring body (31) and a sealing ring annular boss (32) disposed around one end of the sealing ring body (31), the sealing ring body (31) is used to be fitted onto the electrode body (21), and the sealing ring annular boss (32) is used to be placed in the sealing groove (25).

7. The battery cover according to claim 2, characterized in that, The welding block (24) includes a welding block body (241) and a welding protrusion (242). In the length direction of the connecting piece (22), the welding protrusion (242) is disposed on the side of the welding block body (241) away from the connecting piece (22), and the side of the welding protrusion (242) facing the cover plate body (1) is flush with the side of the welding block body (241) facing the cover plate body (1).

8. The battery cover according to claim 7, characterized in that, It also includes a lower plastic (4), which has a through groove (41). The lower plastic (4) is sleeved on the outer periphery of the connecting piece (22) of the pole structure (2) through the through groove (41) and abuts against the cover plate body (1) and the welding protrusion (242) along the thickness direction of the cover plate body (1). The lower plastic (4) is engaged with the cover plate body (1).

9. The battery cover according to claim 1, characterized in that, The cover plate body (1) has a recess (12) on the side facing the connecting piece (22), and at least a portion of at least one of the intermediate insulating member, the welding block (24) and the connecting piece (22) is located in the recess (12).

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

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