Battery cells, battery packs, and electrical devices

Abstract

This utility model discloses a battery cell, a battery device, and an electrical device. The battery cell includes a housing, a top cover assembly, and an electrode assembly. The housing has an open opening, which is sealed by the top cover assembly. The top cover assembly and the housing together define a receiving cavity. The top cover assembly includes a top cover, a terminal post, and a sealing element. The top cover has a terminal post hole, and the terminal post is installed in the terminal post hole. The sealing element is made of insulating material and surrounds the terminal post. The sealing element is located between the terminal post and the top cover. The top cover is an integrally formed part. The electrode assembly is disposed in the receiving cavity and includes an electrode body and a tab connected to the electrode body. The tab is connected to the terminal post. According to the battery cell of this utility model embodiment, the top cover assembly of this battery cell has a high yield rate, a short process, and a good sealing effect during the production process.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery cell, a battery device, and an electrical device. Background Technology

[0002] Currently, batteries are being used more and more widely. They are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and many other fields.

[0003] In related technologies, a single battery cell includes a casing, a top cover assembly, and electrode assemblies. The top cover assembly seals the opening of the casing and defines a space between itself and the casing for accommodating the electrode assemblies. However, the top cover assembly in these technologies suffers from low yield, long manufacturing process, and poor sealing performance. Therefore, improving the yield, shortening the manufacturing process, and enhancing the sealing performance of the top cover assembly are technical problems that need to be solved. Utility Model Content

[0004] In view of the above problems, the present invention provides a battery cell, a battery device, and an electrical device, wherein the top cover assembly of the battery cell has a high yield, a short manufacturing process, and a good sealing effect.

[0005] In a first aspect, this utility model provides a battery cell, comprising: a housing having an open opening; a top cover assembly covering the open opening, the top cover assembly and the housing jointly defining a receiving cavity, the top cover assembly including a top cover, a terminal post, and a sealing element, the top cover having a terminal post hole, the terminal post being installed in the terminal post hole, the sealing element being made of insulating material and surrounding the terminal post, the sealing element being located between the terminal post and the top cover, the top cover being an integrally formed part; and an electrode assembly disposed within the receiving cavity and including an electrode body and a tab connected to the electrode body, the tab being connected to the terminal post.

[0006] In the above technical solution, by making the top cover of the battery cell a one-piece molded part, the number of welds on the top cover can be reduced. Due to the reduction in the number of welds, welding quality problems caused by the welding of the top cover itself can be reduced, such as welding deformation of the top cover. It can also reduce interference between welds, which is beneficial to improving the yield of the top cover. It can also reduce the difficulty of determining the location of leaks during helium detection. Furthermore, it can reduce welding steps, which is beneficial to shorten the process and improve production efficiency. In addition, by placing the seal between the terminal post and the top cover and making the top cover a one-piece molded part, the problem of poor compression effect of the seal due to welding deformation of the top cover can be avoided. This can make the overall structural strength of the top cover better, so that the top cover has higher compressive strength and better compression effect on the seal, resulting in better sealing of the top cover assembly.

[0007] In some embodiments, the battery cell is a square battery, the top cover is rectangular, and the width of the top cover is W1, where W1 ≤ 40 mm.

[0008] In the above technical solution, by setting the width of the top cover to no more than 40mm, the width of the top cover is smaller, which makes it easier to connect the pole on the top cover to the tab of the electrode assembly. It also helps to reduce the length of the tab, thereby reducing the tab redundancy problem and thus reducing the short circuit problem caused by the redundant insertion of the tab into the electrode body.

[0009] In some embodiments, the top cover is provided with two pole hole, the two pole holes are arranged at intervals along the length direction of the top cover, and two poles with opposite polarities are installed in the two pole holes respectively.

[0010] In the above technical solution, by arranging the two pole holes on the top cover along the length of the top cover, the space in the length direction of the top cover can be fully utilized, and the distance between the two poles on the top cover can be larger. In this way, when connecting the poles on the top cover to the tabs of the electrode assembly, sufficient space can be provided for the connection operation between the poles on the top cover and the tabs of the electrode assembly, which can reduce the interference problem in the connection process between the two poles on the top cover and the tabs of the electrode assembly, and reduce the difficulty of the connection operation between the poles on the top cover and the tabs of the electrode assembly.

[0011] In some embodiments, the top cover assembly includes a mounting ring connected to the outside of the top cover and surrounding the pole post for mounting and securing the pole post.

[0012] In the above technical solution, by setting an installation protrusion ring on the top cover, it is convenient to install and fix the pole to the top cover.

[0013] In some embodiments, the battery cell is a square battery, the top cover is rectangular, the width of the top cover is W1, and the dimension of the mounting protrusion in the width direction of the top cover is W2, where 2mm≤W1-W2≤6mm.

[0014] In the above technical solution, by setting the difference between the width of the top cover and the width of the mounting ring between 2mm and 6mm, ensuring that the difference is not less than 2mm, sufficient spacing is maintained between the edge of the top cover and the edge of the mounting ring in the width direction of the top cover. This reduces the probability of interference between the connection between the mounting ring and the top cover and between the top cover and the housing. For example, when the mounting ring and the top cover are welded together, and the top cover and the housing are welded together, the probability of interference between the weld between the mounting ring and the top cover and between the top cover and the housing is reduced, minimizing the influence between welds and improving the assembly quality of the top cover assembly. By ensuring that the difference between the width of the top cover and the width of the mounting ring is not greater than 6mm, the mounting ring can have a larger size when the width of the top cover is fixed, resulting in a better installation and fixing effect of the mounting ring on the pole post.

[0015] In some embodiments, the mounting protrusion is a metal part, and an insulating layer is provided between the mounting protrusion and the pole post.

[0016] In the above technical solution, by making the mounting protrusion a metal part, the mounting protrusion can have higher structural strength, thereby improving the mounting and fixing effect of the mounting protrusion on the pole post; based on making the mounting protrusion a metal part, an insulating layer is provided between the mounting protrusion and the pole post, which can insulate and separate the mounting protrusion and the pole post, thereby preventing short circuits from occurring between the top cover and the pole post through the mounting protrusion.

[0017] In some embodiments, the mounting protrusion includes a mounting portion and a limiting portion, the limiting portion surrounding the outer periphery of the pole post, and the mounting portion connected to the outer periphery of the limiting portion and connected to the top cover.

[0018] In the above technical solution, by setting the mounting protrusion ring to include a mounting part and a limiting part, the limiting part surrounds the outer periphery of the pole post for mounting and fixing the pole post, and the mounting part is connected to the top cover, it is convenient to fix the mounting protrusion ring on the top cover, thereby making it easy to install and fix the pole post on the top cover by the mounting protrusion ring.

[0019] In some embodiments, the outer surface of the top cover is provided with a mounting groove, the mounting groove is disposed around the pole hole and penetrates the inner peripheral wall of the pole hole, and the mounting part is accommodated in the mounting groove.

[0020] In the above technical solution, by providing an installation groove on the outer surface of the top cover and allowing the mounting portion of the mounting ring to be accommodated in the installation groove, the mounting ring can be positioned and installed, facilitating the connection between the mounting ring and the top cover.

[0021] In some embodiments, the electrode post includes an electrode post body and an electrode post protrusion. The electrode post protrusion is connected to the outer peripheral wall of the electrode post body and is disposed around the electrode post body. The limiting portion includes a first limiting segment and a second limiting segment. The first limiting segment is connected between the mounting portion and the second limiting segment and is disposed around the outer peripheral side of the electrode post protrusion. The second limiting segment is located on the side of the electrode post protrusion away from the electrode assembly. At least a portion of the seal is located between the electrode post protrusion and the top cover.

[0022] In the above technical solution, by setting the electrode post as an electrode post body and an electrode post protrusion connected to the outer periphery of the electrode post body, and setting the limiting part of the mounting ring as including a first limiting segment and a second limiting segment, the electrode post can be limited by making the first limiting segment surround the outer periphery of the electrode post protrusion, and at least a part of the sealing member is located between the electrode post protrusion and the top cover. The second limiting segment is located on the side of the electrode post protrusion away from the electrode assembly. In this way, the second limiting segment of the mounting ring and the top cover can limit and compress the sealing member, thereby improving the sealing effect.

[0023] In some embodiments, the tab includes a tab root and a tab body. The tab root connects the electrode body and the tab body. The tab body is bent and connected to the electrode post. The battery cell is a square battery. The top cover is rectangular. The dimension of the tab root in the width direction of the top cover is W6, where W6 ≤ 32 mm.

[0024] In the above technical solution, by limiting the dimension of the electrode root in the width direction of the top cover to no more than 32mm, it is convenient to bend the electrode during the manufacturing process, reducing the bending difficulty of the electrode and reducing the length of the electrode, thereby reducing the electrode redundancy problem and the short circuit problem caused by the redundant insertion of the electrode into the electrode body.

[0025] In some embodiments, the top cover assembly includes a first insulating structure fixed to the side of the top cover facing the electrode assembly, the first insulating structure having a first clearance hole for avoiding the electrode post.

[0026] In the above technical solution, by providing a first insulating structure on the side of the top cover facing the electrode assembly, the top cover and the electrode assembly can be insulated and separated, thus avoiding short circuits caused by contact between the top cover and the electrode assembly.

[0027] In some embodiments, the first insulating structure is provided with a first positioning protrusion, and the top cover is provided with a first positioning hole, wherein the first positioning protrusion is inserted into the first positioning hole.

[0028] In the above technical solution, when the first insulating structure is installed on the top cover, the first insulating structure can be quickly fixed to the top cover by inserting the first positioning protrusion on the first insulating structure into the first positioning hole on the top cover, and the first insulating structure can be easily installed and removed.

[0029] In some embodiments, the top cover is provided with two pole hole, and two poles with opposite polarities are respectively installed in the two pole hole. There are two first insulating structures, one of which has a first clearance hole for clearance of the positive pole, and the other has a first clearance hole for clearance of the negative pole.

[0030] In the above technical solution, a first insulating structure is provided near the two pole holes of the top cover, which can achieve insulation separation between the top cover and the positive pole of the electrode assembly and the negative pole of the electrode assembly.

[0031] In some embodiments, the two first insulating structures are connected and integrally formed; or, the two first insulating structures are spaced apart.

[0032] In the above technical solution, by making the two first insulating structures integrally molded, the number of parts of the top cover assembly can be reduced, and the assembly process can be reduced; or, by setting the two first insulating structures apart, the size of each first insulating structure can be relatively small, thereby making the structural strength of a single first insulating structure higher.

[0033] In some embodiments, the battery cell includes a second insulating structure fixed to the electrode assembly or housing, at least a portion of the second insulating structure contacting or connecting to the tab for securing and supporting the tab.

[0034] In the above technical solution, by setting a second insulating structure and making at least part of the second insulating structure contact or connect with the electrode tab, the electrode tab can be fixed and supported, reducing the risk of redundant insertion of the electrode body during the bending process.

[0035] In some embodiments, the second insulating structure includes a support body and at least one fixed support portion. The support body is fixed to the electrode body or housing. The support body is provided with a second clearance hole for avoiding the electrode tab. The fixed support portion is connected to the inner peripheral wall of the second clearance hole and contacts the electrode tab for fixing and supporting the electrode tab.

[0036] In the above technical solution, by setting the second insulation structure to include a support body and at least one fixed support part, the support body is fixed to the electrode body or the housing, which facilitates the installation and fixation of the second insulation structure. Furthermore, the at least one fixed support part contacts the electrode tab, thereby achieving fixed support for the electrode tab and reducing the risk of redundant insertion of the electrode tab into the electrode body during the bending process.

[0037] In some embodiments, the electrode tab includes an electrode tab root and an electrode tab body. The electrode tab root connects the electrode body and the electrode tab body. The electrode tab body is bent and connected to the electrode post. At least a portion of the electrode tab body is located within the second clearance hole.

[0038] In the above technical solution, by making at least a portion of the electrode body located within the second clearance hole of the support body, the overall structure can be made compact, which is beneficial to improving the energy density of the battery cell.

[0039] In some embodiments, at least a portion of the fixing support is located on the side of the electrode body facing the electrode body to support the electrode body.

[0040] In the above technical solution, by placing at least a portion of the fixed support portion on the side of the tab body facing the electrode body, the tab body can be better supported. Furthermore, the fixed support portion located between the tab body and the electrode body can better separate the tab body from the electrode body, which is more conducive to reducing the risk of redundant insertion of the tab body into the electrode body.

[0041] In some embodiments, at least a portion of the fixing support covers the surface of the base of the tab facing the top cover.

[0042] In the above technical solution, by having at least a portion of the fixed support portion cover the surface of the electrode root facing the top cover, the electrode can be shaped and fixed, and the electrode body can be supported. Furthermore, the fixed support portion located on the surface of the electrode root facing the top cover can effectively reduce the risk of redundant insertion of the electrode body into the electrode body or the electrode root.

[0043] In some embodiments, the second clearance hole is provided with a plurality of fixed support portions, which are arranged at intervals along the circumference of the second clearance hole and distributed at different positions of the tab.

[0044] In the above technical solution, by setting multiple fixed support parts, the electrode tab can be better supported and shaped, reducing the risk of redundant insertion of the electrode tab. Furthermore, by arranging multiple fixed support parts at intervals along the circumference of the second clearance hole, the electrode tab can be supported and fixed at different positions, further reducing the risk of redundant insertion of the electrode tab.

[0045] In some embodiments, the battery cell is a square battery, the top cover is rectangular, and the plurality of fixed supports are divided into two groups of fixed support parts. Each group of fixed support parts includes at least one fixed support part. The two groups of fixed support parts are arranged at intervals along the width direction of the top cover to form a limiting opening for the tab to pass through between the two groups of fixed support parts.

[0046] In the above technical solution, by dividing multiple fixed supports into two sets of fixed support groups and arranging the two sets of fixed support groups at intervals along the width direction of the top cover, and defining a limiting opening between the two sets of fixed support groups for the insertion of the electrode tab, the electrode tab can be effectively supported and fixed in the width direction of the top cover through the two sets of fixed support groups, and the overall structure is compact.

[0047] In some embodiments, the tab includes a tab root and a tab body. The tab root connects the electrode body and the tab body. The tab body is bent and connected to the electrode post. The connection position between the tab body and the tab root is located within the limiting opening. One set of the fixing support parts is located on the side of the tab body facing the electrode body to support the tab body. Another set of the fixing support parts covers the surface of the tab root facing the top cover.

[0048] In the above technical solution, by positioning the connection between the base of the electrode and the main body of the electrode within the limiting opening defined between the two sets of fixed support parts, the main body of the electrode can be positioned within the second clearance hole. Furthermore, by supporting and fixing the electrode with multiple fixed support parts, the risk of redundant insertion of the electrode can be reduced. Moreover, by positioning one set of fixed support parts on the side of the main body of the electrode facing the electrode body, and the other set of fixed support parts covering the surface of the base of the electrode facing the top cover, effective support and fixing of the main body of the electrode can be achieved, and the main body of the electrode can be separated from the electrode body, reducing the risk of the main body of the electrode being inserted into the base of the electrode or the electrode body.

[0049] In some embodiments, the dimension of the limiting opening in the width direction of the top cover is W5, where W5 ≤ 6 mm.

[0050] In the above technical solution, by limiting the size of the limiting port between the two sets of fixed support parts in the width direction of the top cover to no more than 6mm, the fit between the electrode tab and the limiting port can be made tight, reducing the fit gap between the electrode tab and the inner wall of the limiting port. This can reduce the risk of liquids outside the battery cell entering the electrode body through the fit gap between the electrode tab and the inner wall of the limiting port.

[0051] In some embodiments, the outer surface of the electrode body is covered with an insulating protective film, and the support body is connected and fixed to the insulating protective film.

[0052] In the above technical solution, by covering the outer surface of the electrode body with an insulating protective film, the insulating protective film can protect the electrode body and make the electrode body and the shell insulated and separated. Furthermore, by fixing the bracket body to the insulating protective film, it is convenient to install and fix the bracket body.

[0053] In some embodiments, the support body is thermally fused to the insulating protective film.

[0054] In the above technical solution, by thermally fusing the support body and the insulating protective film, the connection between the support body and the insulating protective film can be made more reliable and the process is simpler.

[0055] In some embodiments, the top cover assembly includes a first insulating structure fixed to the side of the top cover facing the electrode assembly. The first insulating structure has a first clearance hole for avoiding the electrode post. The first insulating structure has a dimension of W3 in the width direction of the top cover, and the second clearance hole has a dimension of W4 in the width direction of the top cover, where W3 ≥ W4.

[0056] In the above technical solution, by providing a first insulating structure on the side of the top cover facing the electrode assembly, the top cover and the electrode assembly can be insulated and separated, avoiding short circuit between the top cover and the electrode assembly; by making the dimension of the first insulating structure in the width direction of the top cover greater than or equal to the dimension of the second clearance hole in the width direction of the top cover, the first insulating structure can cover the side of the second clearance hole facing the top cover, reducing the risk of liquids or other substances outside the battery cell entering the second clearance hole.

[0057] In some embodiments, the top cover assembly includes a first insulating structure fixed to the side of the top cover facing the electrode assembly. The first insulating structure has a first clearance hole for avoiding the electrode post. The side of the support body facing the top cover has a mating groove, which surrounds the outer periphery of the second clearance hole. The first insulating structure is accommodated in the mating groove.

[0058] In the above technical solution, by providing a first insulating structure on the side of the top cover facing the electrode assembly, the top cover and the electrode assembly can be insulated and separated, avoiding short circuits caused by contact between the top cover and the electrode assembly. By providing a mating groove on the side of the support body facing the top cover and allowing the first insulating structure to be accommodated in the mating groove, it is convenient to position the top cover assembly when assembling the top cover assembly with the housing and the electrode assembly. Furthermore, by having the first insulating structure on the top cover assembly accommodated in the mating groove of the second insulating structure, the second insulating structure can also be limited, reducing the risk of the second insulating structure moving relative to the top cover assembly, thereby reducing the risk of wear on the electrode tabs due to movement of the second insulating structure relative to the top cover assembly.

[0059] In some embodiments, the mating groove has a dimension of h1 in the thickness direction of the top cover, and the first insulating structure has a dimension of h2 in the thickness direction of the top cover, where h1 ≥ h2.

[0060] In the above technical solution, by making the dimension of the mating groove in the thickness direction of the top cover greater than or equal to the dimension of the first insulating structure in the thickness direction of the top cover, the first insulating structure can be completely accommodated in the mating groove, which is beneficial to reducing the dimension of the battery cell in the thickness direction of the top cover, making the structure of the battery cell more compact, and improving the energy density of the battery cell.

[0061] In some embodiments, the dimension of the mating groove in the thickness direction of the top cover is h1, where h1 ≥ 0.5 mm.

[0062] In the above technical solution, by making the dimension of the mating groove in the thickness direction of the top cover greater than or equal to 0.5 mm, the mating groove can have sufficient depth to accommodate the first insulating structure.

[0063] In some embodiments, the mating groove has a dimension of h1 in the thickness direction of the top cover, h1 ≥ 0.5 mm; and / or, the first insulating structure has a dimension of h2 in the thickness direction of the top cover, h2 ≥ 0.5 mm.

[0064] In the above technical solution, by making the dimension of the first insulating structure in the thickness direction of the top cover greater than or equal to 0.5mm, the first insulating structure can have sufficient thickness to meet the requirements of insulation, structural strength, etc.

[0065] In some embodiments, the outer peripheral sidewall of the first insulating structure is provided with a clearance ramp, which extends obliquely toward the central axis of the second clearance hole in the direction from the top cover to the electrode assembly.

[0066] In the above technical solution, by providing a clearance slope on the outer peripheral sidewall of the first insulating structure, when assembling the top cover assembly with the housing, the clearance slope facilitates the first insulating structure to be accommodated in the mating groove of the second insulating structure, reducing the problem of interference between the first insulating structure and the second insulating structure during the assembly process, making the assembly more convenient and smooth.

[0067] In some embodiments, the mating groove extends through the support body along the width direction of the top cover.

[0068] In the above technical solution, by making the mating groove penetrate the support body along the width direction of the top cover, the area of ​​the mating groove can be made larger, thereby increasing the accommodating space of the mating groove and increasing the mating area between the first insulation structure and the second insulation structure, which is beneficial to improving the stability of the mating between the first insulation structure and the second insulation structure.

[0069] In some embodiments, the support body is in contact with or connected to the top cover assembly.

[0070] In the above technical solution, by making the bracket body contact or connect with the top cover assembly, the top cover assembly can limit the second insulation structure, which can reduce the risk of the second insulation structure moving relative to the top cover assembly, thereby reducing the risk of wear on the electrode tabs due to the movement of the second insulation structure relative to the top cover assembly.

[0071] In some embodiments, the top cover assembly includes a first insulating structure fixed to the side of the top cover facing the electrode assembly, the first insulating structure having a first clearance hole for avoiding the electrode post, and the bracket body being connected to the first insulating structure.

[0072] In the above technical solution, by setting a first insulating structure on the side of the top cover facing the electrode assembly, the top cover and the electrode assembly can be insulated and separated, avoiding short circuit between the top cover and the electrode assembly; and by connecting the support body to the first insulating structure, the second insulating structure can be limited, reducing the risk of the second insulating structure moving relative to the top cover assembly, thereby reducing the risk of wear on the electrode tabs due to movement of the second insulating structure relative to the top cover assembly.

[0073] In some embodiments, the bracket body is snapped into the first insulating structure.

[0074] In the above technical solution, by setting the connection method between the support body and the first insulating structure to a snap-fit ​​connection, the connection between the first insulating structure and the support body can be facilitated, making the connection operation between the two simple.

[0075] In some embodiments, at least a portion of the first insulating structure is stacked with the support body in the thickness direction of the top cover, and the support body and the first insulating structure are snapped together along the thickness direction of the top cover.

[0076] In the above technical solution, by making the bracket body and the first insulating structure snap together along the thickness direction of the top cover, the snap connection between the bracket body and the first insulating structure is completed at the same time as the top cover assembly is assembled onto the housing. That is, the snap connection between the bracket body and the first insulating structure can be achieved by using the assembly force between the top cover assembly and the housing, which simplifies the assembly process.

[0077] In some embodiments, one of the bracket body and the first insulating structure is provided with a second positioning protrusion and the other is provided with a second positioning hole, the second positioning protrusion being inserted into the first positioning hole along the thickness direction of the top cover.

[0078] In the above technical solution, when assembling the top cover assembly onto the housing, the first insulating structure and the bracket body can be easily connected by inserting the second positioning protrusion into the second positioning hole along the thickness direction of the top cover.

[0079] In some embodiments, the top cover is provided with two pole hole, and two poles with opposite polarities are respectively installed in the two pole hole. There are two second insulating structures, one of which has a second clearance hole for clearance of the positive pole tab, and the other has a second clearance hole for clearance of the negative pole tab.

[0080] In the above technical solution, by setting two second insulation structures, the positive electrode tab and the negative electrode tab are respectively supported and fixed, which can reduce the risk of redundant insertion of the positive electrode tab and the negative electrode tab.

[0081] In some embodiments, the two second insulating structures are connected and integrally formed; or, the two second insulating structures are spaced apart.

[0082] In the above technical solutions, by making the two second insulating structures integrally molded, the number of parts in the top cover assembly can be reduced, and the assembly process can be reduced; or, by setting the two second insulating structures apart, the size of each second insulating structure can be relatively small, thereby making the structural strength of a single second insulating structure higher.

[0083] In some embodiments, the battery cell is a square battery, the top cover is rectangular, the two terminal holes are arranged at intervals along the length of the top cover, each second insulating structure includes a first sub-support and a second sub-support arranged and connected along the width of the top cover, the first sub-support and the second sub-support of each second insulating structure together define the second clearance hole, and the first sub-support and the second sub-support are both independently molded parts.

[0084] In the above technical solution, by setting each second insulation structure to include a first sub-support and a second sub-support connected along the width direction of the top cover, the first sub-support and the second sub-support of the second insulation structure can be connected along the width direction of the top cover and the electrode tab is clamped between the first sub-support and the second sub-support, which facilitates the installation of the second insulation structure and facilitates the cooperation between the second insulation structure and the electrode tab.

[0085] In some embodiments, the first sub-bracket and the second sub-bracket are snap-fitted together.

[0086] In the above technical solution, by making the first sub-support and the second sub-support snap-fit ​​together, it is convenient for the first sub-support and the second sub-support to be connected to form the second insulation structure, and it is also convenient for the first sub-support and the second sub-support to be disassembled, so as to facilitate the adjustment of the fit between the electrode tab and the second insulation structure.

[0087] In some embodiments, the first sub-supports of the two second insulating structures are integrally formed, and the second sub-supports of the two second insulating structures are integrally formed.

[0088] In the above technical solution, by making the first sub-support of the two second insulation structures integrally formed and the second sub-support of the two second insulation structures integrally formed, when assembling the second insulation structures corresponding to the positive electrode tab and the negative electrode tab, the first sub-support and the second sub-support are connected along the width direction of the top cover to assemble the two second insulation structures, thereby reducing the assembly process.

[0089] In some embodiments, the battery cell is a square battery, the top cover is rectangular, and the width of the top cover is W1, where 30mm≤W1≤38mm.

[0090] In the above technical solution, based on the second insulating structure including the above-mentioned support body and at least one fixed support part, a top cover with a width range of 30mm to 38mm is matched. The second insulating structure can realize the supporting and shaping function of the tabs corresponding to the top cover with the width range, which can effectively reduce the risk of redundant insertion of tabs.

[0091] In some embodiments, the second insulating structure includes at least one fixing support piece, which is bonded and fixed to the electrode tab.

[0092] In the above technical solution, by setting the second insulation structure to include at least one fixed support piece, and fixing the fixed support piece to the electrode tab to support the fixed electrode tab, the second insulation structure can be made simple and occupy less space.

[0093] In some embodiments, there are multiple fixing support pieces, which are bonded and fixed at different positions on the surface of the electrode tab.

[0094] In the above technical solution, by setting multiple fixed support pieces, and each of the multiple fixed support pieces is bonded and fixed to different positions on the electrode tab, support and fixation can be achieved at different positions of the electrode tab, further reducing the risk of redundant insertion of the electrode tab.

[0095] In some embodiments, the tab includes a tab root and a tab body. The tab root connects the electrode body and the tab body. The tab body is bent and connected to the electrode post. At least a portion of the fixing support piece is bonded and fixed to the surface of the tab body, and at least a portion of the fixing support piece is bonded and fixed to the surface of the tab root.

[0096] In the above technical solution, by bonding and fixing at least part of the fixing support piece to the surface of the tab body, the tab body in a bent state is supported and shaped, reducing the risk of redundant insertion of the tab body into the electrode body or the tab root; by bonding and fixing at least part of the fixing support piece to the tab root, the tab root can be fixed, and the tab body and the electrode body can be separated by the fixing support piece, further reducing the risk of redundant insertion of the tab.

[0097] In some embodiments, the battery cell is a square battery, the top cover is rectangular, and the width of the top cover is W1, where W1 ≤ 28 mm.

[0098] In the above technical solution, the second insulating structure is configured to include at least one fixed support piece, and a top cover with a width of no more than 28mm is matched. The second insulating structure can achieve the supporting and shaping function of the tabs corresponding to the top cover with a width range, which can effectively reduce the risk of redundant insertion of tabs.

[0099] Secondly, this utility model provides an assembly process for a battery cell, comprising: assembling a top cover assembly and an electrode assembly, wherein the top cover assembly includes a top cover, a terminal post, and a sealing element, and the electrode assembly includes a tab in an unbent state; placing the electrode assembly into a housing, with the tab in an unbent state extending through an opening in the housing to the top of the housing; placing the top cover assembly on top of the housing in a first placement state; connecting the tab in an unbent state to the terminal post of the top cover assembly; flipping the top cover assembly at a preset angle to a second placement state, wherein the top cover assembly covers the opening in the housing, and the tab in an unbent state bends under the flipping action of the top cover assembly to form a tab in a bent state; and connecting the top cover to the housing.

[0100] In the above technical solution, during the assembly of the battery cell, the top cover assembly is assembled, and the assembled electrode assembly is assembled into the housing. The top cover assembly is placed in a first placement state. In the first placement state, the terminal post on the assembled top cover assembly is connected to the electrode tab on the electrode assembly placed in the housing, which facilitates the connection operation between the terminal post and the electrode tab. Then, the top cover assembly is flipped over from the first placement state to a preset angle to a second placement state. Through the flipping action of the top cover assembly, the electrode tab can be bent to a bent state. In the second placement state, the top cover is connected to the housing. This assembly process can simplify the assembly steps of the top cover assembly, housing, and electrode assembly, which is beneficial to shortening the battery cell manufacturing process and improving the battery cell production efficiency.

[0101] In some embodiments, the top cover is rectangular, and the flip axis of the top cover assembly extends along the length of the top cover.

[0102] In the above technical solution, by making the flipping axis of the top cover assembly extend along the length of the top cover, it is beneficial to reduce the length of the tabs, thereby reducing the risk of redundant tab insertion; and it facilitates the flipping operation of the top cover assembly, reducing the pulling damage to the tabs during the flipping process.

[0103] In some embodiments, the width of the top cover is W1, where W1 ≤ 40 mm.

[0104] In the above technical solution, by setting the width of the top cover to no more than 40mm, the width of the top cover is smaller, which makes it easier to connect the pole on the top cover to the tab of the electrode assembly. It also helps to reduce the length of the tab, thereby reducing the tab redundancy problem and thus reducing the short circuit problem caused by the redundant insertion of the tab into the electrode body.

[0105] In some embodiments, the top cover is a one-piece molded part.

[0106] In the above technical solution, by making the top cover of the battery cell a one-piece molded part, the number of welds on the top cover can be reduced. Due to the reduction in the number of welds, welding quality problems caused by the welding of the top cover itself can be reduced, such as welding deformation of the top cover. It can also reduce interference between welds, which is beneficial to improving the yield of the top cover. It can also reduce the difficulty of determining the location of leaks during helium detection. Furthermore, it can reduce welding steps, which is beneficial to shorten the process and improve production efficiency. In addition, by placing the seal between the terminal post and the top cover and making the top cover a one-piece molded part, the problem of poor compression effect of the seal due to welding deformation of the top cover can be avoided. This can make the overall structural strength of the top cover better, so that the top cover has higher compressive strength and better compression effect on the seal, resulting in better sealing of the top cover assembly.

[0107] In some embodiments, the tab includes a tab root and a tab body, the tab root connecting the electrode body and the tab body; wherein, in the first placement state, at least a portion of the tab body is located above the housing, and the pole of the top cover assembly is attached to and welded to the tab body in its unbent state.

[0108] In the above technical solution, by placing the electrode body of the electrode tab above the housing, and making the pole of the top cover assembly fit against the electrode body in an unbent state, it is convenient to weld the electrode body of the electrode tab to the pole on the top cover assembly.

[0109] In some embodiments, the preset angle is 70° to 110°.

[0110] In the above technical solution, by setting the flip angle of the top cover assembly between 70° and 110°, it is convenient to flip the top cover assembly. When the top cover assembly is in the first placement state, the thickness direction of the top cover assembly can be set roughly in the horizontal direction, which can provide sufficient space for the connection operation between the pole on the top cover assembly and the tab on the electrode assembly, making the connection operation between the tab and the pole easier.

[0111] In some embodiments, assembling the top cover assembly includes: fitting the seal onto the outer periphery of the pole; installing the pole with the seal fitted onto the pole into the pole hole of the top cover, such that the seal is located between the pole and the top cover.

[0112] In the above technical solution, by fitting the seal onto the pole and then installing it as a whole into the pole hole, the assembly process of the top cover assembly is made easier. Furthermore, by positioning the seal between the pole and the top cover, the sealing effect of the seal can be improved through the combined compression of the seal by the pole and the top cover.

[0113] In some embodiments, before placing the electrode assembly into the housing, the assembly process further includes: fixing a second insulating structure to the electrode assembly, such that at least a portion of the second insulating structure contacts or connects to the tab to securely support the tab.

[0114] In the above technical solution, before the electrode assembly is placed into the housing, the second insulating structure is fixed to the electrode assembly to facilitate the installation of the second insulating structure. During the process of the top cover assembly flipping from the first placement state to the second placement state, the electrode tab is driven to bend to the bent state. During this process, the second insulating structure can play a supporting and shaping role for the electrode tab, reducing the risk of redundant insertion of the electrode tab into the electrode body.

[0115] In some embodiments, the top cover assembly includes a first insulating structure disposed on the top cover, wherein the second insulating structure engages with the first insulating structure during the process of flipping the top cover assembly to a second placement state by a preset angle.

[0116] In the above technical solution, by providing a first insulating structure on the side of the top cover facing the electrode assembly, the top cover and the electrode assembly can be insulated and separated, avoiding short circuits caused by contact between the top cover and the electrode assembly; and, during the process of flipping the top cover assembly to the second placement state, the second insulating structure and the first insulating structure can be snapped together, so that the top cover assembly can limit the second insulating structure, reducing the risk of the second insulating structure moving relative to the top cover assembly, thereby reducing the risk of wear on the electrode tabs due to the movement of the second insulating structure relative to the top cover assembly.

[0117] Thirdly, the present invention provides a battery device, comprising: a housing; and a battery cell according to the first aspect embodiment of the present invention, disposed within the housing.

[0118] In the above technical solution, by setting the battery cell, the top cover assembly of the battery cell has a high yield, a short process and a good sealing effect during the production process, which is conducive to improving the production efficiency and overall performance of the battery device.

[0119] Fourthly, the present invention provides an electrical device, including a battery device according to the third aspect embodiment of the present invention described above.

[0120] In the above technical solution, by setting the above battery device, the battery device includes a battery cell, and the top cover assembly of the battery cell has a high yield, a short process and a good sealing effect during the production process, which is conducive to improving the production efficiency and overall performance of the battery device.

[0121] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0122] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0123] Figure 1 This is a three-dimensional schematic diagram of a battery cell according to some embodiments of the present invention;

[0124] Figure 2 yes Figure 1 A side view of a single battery cell;

[0125] Figure 3 yes Figure 1 A side view of a single battery cell from another angle;

[0126] Figure 4 yes Figure 1 A top view of a single battery cell;

[0127] Figure 5 It is along Figure 4 Schematic diagram of the cross section of the CC line;

[0128] Figure 6 yes Figure 5 A schematic diagram of the top cover assembly;

[0129] Figure 7 yes Figure 5 A schematic diagram of the second insulation structure in the diagram;

[0130] Figure 8 This is a schematic diagram of another type of second insulation structure;

[0131] Figure 9 yes Figure 5 A schematic diagram of the first insulation structure in the diagram;

[0132] Figure 10 This is a cross-sectional schematic diagram of a battery cell according to other embodiments of the present invention;

[0133] Figure 11 yes Figure 10 A partial structural diagram of a battery cell in the diagram;

[0134] Figure 12 yes Figure 11 A schematic diagram of the first and second insulation structures in the diagram;

[0135] Figure 13 yes Figure 12 An exploded view of the first insulating structure in the diagram;

[0136] Figure 14 This is an assembly diagram of the first insulation structure and the second insulation structure of a battery cell according to other embodiments of the present invention;

[0137] Figure 15 yes Figure 14 A schematic diagram showing the separation of the first and second insulation structures in the diagram;

[0138] Figure 16 This is a cross-sectional schematic diagram of a battery cell according to other embodiments of the present invention;

[0139] Figure 17 yes Figure 16 A schematic diagram of the assembly of the first and second insulation structures in the diagram;

[0140] Figure 18 yes Figure 17 A schematic diagram showing the separation of the first and second insulation structures in the diagram;

[0141] Figure 19 This is a partial structural schematic diagram of a battery cell according to other embodiments of the present invention;

[0142] Figure 20 yes Figure 19 A schematic diagram of the first and second insulation structures in the diagram;

[0143] Figure 21 yes Figure 20 An exploded view of the second insulation structure in the diagram;

[0144] Figure 22 This is a cross-sectional schematic diagram of a battery cell according to other embodiments of the present invention;

[0145] Figure 23 yes Figure 5 A schematic diagram of the assembly process of a single battery cell;

[0146] Figure 24 yes Figure 10 A schematic diagram of the assembly process of a single battery cell;

[0147] Figure 25 yes Figure 16 A schematic diagram of the assembly process of a single battery cell;

[0148] Figure 26 yes Figure 22 A schematic diagram of the assembly process of a single battery cell;

[0149] Figure 27 This is a schematic diagram of a battery device according to some embodiments of the present invention;

[0150] Figure 28 This is a schematic diagram of an electrical device according to some embodiments of the present invention.

[0151] Figure label:

[0152] 100. Battery cell;

[0153] 10. Shell; 11. Opening; 12. Receiving cavity;

[0154] 20. Top cover assembly;

[0155] 30. Top cover; 31. Pole post hole; 32. Mounting groove; 34. Injection hole; 35. Pressure relief structure;

[0156] 40. Terminal post; 41. Terminal post body; 42. Terminal post protrusion; 43. Seal;

[0157] 50. Mounting ring; 51. Mounting part; 52. Limiting part; 521. First limiting section; 522. Second limiting section; 53. Insulating layer;

[0158] 60. First insulating structure; 61. First clearance hole; 62. First positioning protrusion; 63. Clearance slope; 64. Second positioning protrusion; 65. Third sub-bracket; 66. Fourth sub-bracket; 67. Fourth positioning hole; 68. Fourth positioning protrusion;

[0159] 70. Second insulation structure; 701. Mating groove; 71. Support body; 711. Second clearance hole; 712. Second positioning hole; 72. Fixed support part; 73. Limiting port; 74. First sub-support; 75. Second sub-support; 76. Third positioning hole; 77. Third positioning protrusion; 78. Fixed support piece;

[0160] 80. Electrode assembly; 81. Electrode body; 82. Insulating protective film; 83. Electrode tab; 831. Electrode tab root; 832. Electrode tab body;

[0161] 200. Battery assembly; 201. Housing;

[0162] 1000. Electrical equipment; 300. Vehicle body. Detailed Implementation

[0163] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0164] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or accompanying drawings of this invention are used to distinguish different objects, not to describe a specific order or hierarchy.

[0165] In this invention, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments.

[0166] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "attachment," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0167] In this invention, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this invention, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0168] In the embodiments of this utility model, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this utility model shown in the drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this utility model.

[0169] In this utility model, "multiple" refers to two or more (including two).

[0170] In the embodiments of this utility model, unless otherwise specified, all embodiments and optional embodiments of this utility model can be combined with each other to form new technical solutions.

[0171] In the embodiments of this utility model, unless otherwise specified, all technical features and optional technical features of this utility model can be combined with each other to form new technical solutions.

[0172] In embodiments of this invention, the battery apparatus may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar. For example, a battery cell assembly is typically formed by arranging multiple battery cells; a battery cell assembly may also be a battery module, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module may be formed by bundling multiple battery cells together with cable ties.

[0173] The battery device can be a battery pack, which includes a housing and one or more individual battery cells housed within the housing. The individual battery cells can be battery modules, which can be housed within the housing by securing the battery modules to the housing; alternatively, multiple individual battery cells can be housed within the housing by directly securing them to the housing.

[0174] In embodiments of this invention, the housing may include a first housing and a second housing. The first housing and the second housing are fastened together to form a closed space inside the housing for housing individual battery cells. Here, "closed" refers to covering or shutting down; it can be sealed or unsealed. The first housing may be a top cover or a bottom plate. For example, the housing may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, forming a closed space inside the housing for housing individual battery cells.

[0175] In embodiments of this invention, the housing can be part of the vehicle's chassis structure. For example, a portion of the housing can be at least a part of the vehicle's floor, or a portion of the housing can be at least a part of the vehicle's crossbeams and longitudinal beams.

[0176] In this embodiment of the invention, the battery cell can be a rechargeable battery, which refers to a battery cell that can be recharged after discharge to activate the active materials and continue to be used. The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this embodiment of the invention is not limited to these types. The battery cell can be flat, cuboid, etc.

[0177] Currently, batteries are being used more and more widely. They are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and many other fields.

[0178] In related technologies, a single battery cell includes a casing, a top cover assembly, and electrode assemblies. The top cover assembly seals the opening of the casing and defines a space between itself and the casing for accommodating the electrode assemblies. However, the top cover assembly in these technologies suffers from low yield, long manufacturing process, and poor sealing performance. Therefore, improving the yield, shortening the manufacturing process, and enhancing the sealing performance of the top cover assembly are technical problems that need to be solved.

[0179] Based on this, the present invention proposes a battery cell, which includes: a housing, a top cover assembly, and an electrode assembly. The housing has an open opening, and the top cover assembly seals the open opening. The top cover assembly and the housing together define a receiving cavity. The top cover assembly includes a top cover, a terminal post, and a sealing element. The top cover has a terminal post hole, and the terminal post is installed in the terminal post hole. The sealing element is made of insulating material and surrounds the terminal post. The sealing element is located between the terminal post and the top cover. The top cover is an integrally formed part. The electrode assembly is disposed in the receiving cavity and includes an electrode body and a tab connected to the electrode body. The tab is connected to the terminal post.

[0180] In the aforementioned battery cell, by making the top cover of the battery cell a one-piece molded part, the number of welds on the top cover can be reduced. Due to the reduction in the number of welds, welding quality problems caused by the welding of the top cover itself can be reduced, such as welding deformation of the top cover. It can also reduce interference between welds, which is beneficial to improving the yield of the top cover. It can also reduce the difficulty of determining the location of leaks during helium detection. Furthermore, it can reduce welding steps, which is beneficial to shorten the process and improve production efficiency. In addition, by placing the seal between the terminal post and the top cover, and making the top cover a one-piece molded part, the problem of poor compression effect of the seal due to welding deformation of the top cover can be avoided. This can make the overall structural strength of the top cover better, so that the top cover has higher compressive strength and better compression effect on the seal, resulting in better sealing of the top cover assembly.

[0181] The battery device disclosed in this embodiment can be used in electrical devices that use a battery device as a power source or in various energy storage systems that use a battery device as an energy storage element. Besides vehicles, the battery device can also be used in, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0182] The electrical device disclosed in this utility model embodiment can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device is installed inside the vehicle, and the battery device can be located at the bottom, front, or rear of the vehicle. The battery device can be used to power the vehicle; for example, the battery device can serve as the vehicle's operating power source. The vehicle may also include a controller and a motor. The controller is used to control the battery device to supply power to the motor, for example, for the vehicle's starting, navigation, and operating power needs. In some embodiments of this utility model, the battery device can not only serve as the vehicle's operating power source but also as the vehicle's drive power source, replacing or partially replacing gasoline or natural gas to provide driving power for the vehicle.

[0183] The following is for reference. Figures 1-26 Description of a battery cell 100 according to an embodiment of the present utility model.

[0184] refer to Figures 1-5 In a first aspect, the present invention provides a battery cell 100, which includes a housing 10, a top cover assembly 20, and an electrode assembly 80. The housing 10 has an opening 11, which is covered by the top cover assembly 20. The top cover assembly 20 and the housing 10 together define a receiving cavity 12. The top cover assembly 20 includes a top cover 30, a terminal post 40, and a sealing element 43. The top cover 30 has a terminal post hole 31, and the terminal post 40 is installed in the terminal post hole 31. The sealing element 43 is made of insulating material and surrounds the terminal post 40. The sealing element 43 is located between the terminal post 40 and the top cover 30. The top cover 30 is an integrally formed part. The electrode assembly 80 is disposed in the receiving cavity 12 and includes an electrode body 81 and a tab 83 connected to the electrode body 81. The tab 83 is connected to the terminal post 40.

[0185] For example, the opening 11 of the housing 10 can face upwards, and the top cover assembly 20 can be disposed on the top of the housing 10 to cover the opening 11.

[0186] Both the housing 10 and the top cover 30 can be made of metal. For example, the housing 10 can be made of aluminum, aluminum alloy, or steel, and the top cover 30 can be made of aluminum, aluminum alloy, or steel. The top cover 30 can be welded to the housing 10.

[0187] The electrode assembly 80 can be a wound structure or a stacked structure. The electrode assembly 80 can include one electrode group or multiple electrode groups.

[0188] The top cover 30 can be provided with two pole holes 31, and there are two poles 40. One pole 40 is the positive pole 40 and is installed in one pole hole 31, and the other pole 40 is the negative pole 40 and is installed in the other pole hole 31.

[0189] Accordingly, the electrode assembly 80 includes two spaced-apart tabs 83, one of which is a positive tab 83 and the other is a negative tab 83. The positive tab 83 is connected to the positive terminal 40, and the negative tab 83 is connected to the negative terminal 40. The tabs 83 and the terminal 40 can be soldered together.

[0190] Each pole post 40 is provided with a sealing element 43 between it and the top cover 30. The sealing element 43 can be a sealing ring, for example, the material of the sealing element 43 can be rubber.

[0191] For example, the assembly process of the battery cell 100 is as follows: When assembling the battery cell 100, the opening 11 of the housing 10 can be oriented upwards, and the electrode body 81 of the electrode assembly 80 can be inserted into the housing 10 through the opening 11. The tabs 83 of the electrode assembly 80 can extend upwards to the top of the housing 10. The top cover assembly 20 is placed on top of the housing 10. For example, the top cover assembly 20 can be in a first placement state. In the first placement state, the thickness direction of the top cover 30 of the top cover assembly 20 can be set along the width direction of the opening 11. At this time, the central axis of the terminal post 40 on the top cover assembly 20 can extend along the width direction of the opening 11. Then, the terminal post 40 on the top cover assembly 20 is attached to and welded to the tab 83. After the tab 83 and the terminal post 40 are connected, the top cover assembly 20 is flipped so that the top cover assembly 20 is flipped towards the direction close to the opening 11, so that the top cover assembly 20 is flipped to cover the opening 11. At this time, the top cover assembly 20 is in a second placement state. The width of the opening 11 is aligned with the width of the top cover 30, and the length of the opening 11 is aligned with the length of the top cover 30. The width direction of the top cover 30 can be referenced... Figure 3 In the direction of e1, the length direction of the top cover 30 can be referenced. Figure 3 In the e2 direction.

[0192] During the assembly of the top cover assembly 20, the sealing element 43 can be fitted onto the outer periphery of the pole post 40, and then the pole post 40 with the sealing element 43 fitted onto it can be assembled into the pole post hole 31 on the top cover 30. Since the top cover 30 is a one-piece molded part, the assembly and welding process of the top cover 30 itself can be omitted during the assembly of the top cover assembly 20.

[0193] In the above technical solution, by setting the top cover 30 of the battery cell 100 as an integrally formed part, the number of welds on the top cover 30 can be reduced. Due to the reduction in the number of welds, welding quality problems caused by the welding of the top cover 30 itself can be reduced. For example, welding quality problems such as welding deformation of the top cover 30 can be reduced, and interference between welds can also be reduced, which is conducive to improving the yield of the top cover 30. It can also reduce the difficulty of judging the leakage location during helium detection, and reduce welding processes, which is conducive to shortening the process and improving production efficiency. In addition, by setting the sealing element 43 between the pole post 40 and the top cover 30 and setting the top cover 30 as an integrally formed part, the problem of poor compression effect of the sealing element 43 due to welding deformation of the top cover 30 can be avoided. This makes the overall structural strength of the top cover 30 better, so the top cover 30 has higher compressive strength and better compression effect on the sealing element 43, and achieves better sealing performance of the top cover assembly 20.

[0194] In some embodiments, refer to Figure 6 The battery cell 100 is a square battery, and the top cover 30 is rectangular. The width of the top cover 30 is W1, and W1≤40mm.

[0195] In the above technical solution, by setting the width of the top cover 30 to no more than 40mm, the width of the top cover 30 is smaller, which makes it easier to connect the pole post 40 on the top cover 30 to the tab 83 of the electrode assembly 80, and also helps to reduce the length of the tab 83, thereby reducing the redundancy problem of the tab 83, and thus reducing the short circuit problem caused by the redundant insertion of the tab 83 into the electrode body 81.

[0196] In some embodiments, refer to Figure 4 The top cover 30 is provided with two pole post holes 31, which are arranged at intervals along the length of the top cover 30. Two pole posts 40 with opposite polarities are installed in the two pole post holes 31 respectively.

[0197] Among them, the two poles 40 with opposite polarities are the positive pole 40 and the negative pole 40, respectively.

[0198] For example, the top cover 30 may be provided with an injection hole 34 for injecting electrolyte and a pressure relief structure 35. The injection hole 34 and the pressure relief structure 35 may be located between two electrode holes 31, and the injection hole 34 and the pressure relief structure 35 may be arranged at intervals along the length of the top cover 30.

[0199] In the above technical solution, by arranging the two pole holes 31 on the top cover 30 along the length of the top cover 30, the space in the length direction of the top cover 30 can be fully utilized, and the distance between the two poles 40 on the top cover 30 can be larger. In this way, when connecting the poles 40 on the top cover 30 to the tabs 83 of the electrode assembly 80, sufficient space can be provided for the connection operation between the poles 40 on the top cover 30 and the tabs 83 of the electrode assembly 80, which can reduce the interference problem in the connection process between the two poles 40 on the top cover 30 and the tabs 83 of the electrode assembly 80, and reduce the difficulty of the connection operation between the poles 40 on the top cover 30 and the tabs 83 of the electrode assembly 80.

[0200] In some embodiments, refer to Figure 5 and Figure 6 The top cover assembly 20 includes a mounting ring 50, which is connected to the outside of the top cover 30 and surrounds the pole post 40 for mounting and fixing the pole post 40.

[0201] The number of mounting rings 50 is the same as the number of terminals 40. There are two terminals 40 with different polarities, and two mounting rings 50. One mounting ring 50 surrounds the positive terminal 40 to fix the positive terminal 40; the other mounting ring 50 surrounds the negative terminal 40 to fix the negative terminal 40.

[0202] For example, the mounting ring 50 and the top cover 30 can be welded together.

[0203] In the above technical solution, by providing an installation protrusion ring 50 on the top cover 30, it is convenient to install and fix the pole post 40 to the top cover 30.

[0204] In some embodiments, refer to Figure 5 and Figure 6 The battery cell 100 is a square battery, the top cover 30 is rectangular, the width of the top cover 30 is W1, and the dimension of the mounting ring 50 in the width direction of the top cover 30 is W2, 2mm≤W1-W2≤6mm.

[0205] The dimension of the mounting ring 50 in the width direction of the top cover 30 is smaller than the width of the top cover 30, so that the edge of the mounting ring 50 is spaced apart from the edge of the top cover 30 in the width direction of the top cover 30. For example, the projection of the mounting ring 50 on the top cover 30 is located inside the top cover 30.

[0206] For example, the difference between W1 and W2 can be 2mm, 3mm, 4mm, 5mm, 6mm, etc.

[0207] For example, in the width direction of the top cover 30, the two sides of the mounting ring 50 are spaced apart from the two sides of the top cover 30. The distance between the two sides of the mounting ring 50 and the two sides of the top cover 30 can be the same, for example, the distance between the two sides of the mounting ring 50 and the two sides of the top cover 30 can be 1mm to 3mm. For example, the distance between the two sides of the mounting ring 50 and the two sides of the top cover 30 can be 1mm, 2mm, 3mm, etc.

[0208] In the above technical solution, by setting the difference between the width of the top cover 30 and the width of the mounting ring 50 between 2mm and 6mm, ensuring that the difference is not less than 2mm, sufficient spacing is maintained between the edge of the top cover 30 and the edge of the mounting ring 50 in the width direction. This reduces the likelihood of interference between the connection between the mounting ring 50 and the top cover 30 and the connection between the top cover 30 and the housing 10. For example, this reduces interference when the mounting ring 50 and the top cover 30 are welded together. When the top cover 30 is connected to the housing 10 by welding, the probability of interference between the weld between the mounting ring 50 and the top cover 30 and the weld between the top cover 30 and the housing 10 can be reduced, thus reducing the influence between welds and improving the assembly quality of the top cover assembly 20. By ensuring that the difference between the width of the top cover 30 and the width of the mounting ring 50 is no more than 6mm, the mounting ring 50 can have a larger size when the width of the top cover 30 is fixed. This allows the mounting ring 50 to have a better installation and fixing effect on the pole post 40.

[0209] In some embodiments, the mounting ring 50 is a metal part, and an insulating layer 53 is provided between the mounting ring 50 and the pole post 40.

[0210] For example, the mounting ring 50 can be made of aluminum, aluminum alloy, or steel.

[0211] For example, the insulating layer 53 can be a plastic layer.

[0212] In the above technical solution, by setting the mounting protrusion 50 as a metal part, the mounting protrusion 50 can have higher structural strength, thereby improving the mounting and fixing effect of the mounting protrusion 50 on the pole post 40. Based on setting the mounting protrusion 50 as a metal part, an insulating layer 53 is provided between the mounting protrusion 50 and the pole post 40, which can insulate and separate the mounting protrusion 50 and the pole post 40, thereby preventing the top cover 30 from short-circuiting through the mounting protrusion 50 and the pole post 40.

[0213] In some embodiments, refer to Figure 5 and Figure 6The mounting ring 50 includes a mounting portion 51 and a limiting portion 52. The limiting portion 52 surrounds the outer periphery of the pole post 40, and the mounting portion 51 is connected to the outer periphery of the limiting portion 52 and is connected to the top cover 30.

[0214] Both the mounting part 51 and the limiting part 52 can be arranged in a ring around the pole post 40.

[0215] In the above technical solution, by setting the mounting protrusion 50 to include a mounting part 51 and a limiting part 52, the limiting part 52 surrounds the outer periphery of the pole post 40 for mounting and fixing the pole post 40, and the mounting part 51 is connected to the top cover 30, it is convenient to fix the mounting protrusion 50 on the top cover 30, thereby making it easy to install and fix the pole post 40 on the top cover 30 by means of the mounting protrusion 50.

[0216] In some embodiments, refer to Figure 5 and Figure 6 The outer surface of the top cover 30 is provided with a mounting groove 32. The mounting groove 32 surrounds the pole hole 31 and penetrates the inner peripheral wall of the pole hole 31. The mounting part 51 is accommodated in the mounting groove 32.

[0217] The mounting groove 32 can be annular, surrounding the pole hole 31.

[0218] In the above technical solution, by providing an installation groove 32 on the outer surface of the top cover 30, and allowing the mounting portion 51 of the mounting protrusion 50 to be accommodated in the installation groove 32, the mounting position of the mounting protrusion 50 can be achieved, making it convenient to connect the mounting protrusion 50 to the top cover 30.

[0219] In some embodiments, refer to Figure 5 and Figure 6 The electrode post 40 includes an electrode post body 41 and an electrode post protrusion 42. The electrode post protrusion 42 is connected to the outer peripheral wall of the electrode post body 41 and is arranged around the electrode post body 41. The limiting part 52 includes a first limiting segment 521 and a second limiting segment 522. The first limiting segment 521 is connected between the mounting part 51 and the second limiting segment 522. The first limiting segment 521 surrounds the outer peripheral side of the electrode post protrusion 42. The second limiting segment 522 is located on the side of the electrode post protrusion 42 away from the electrode assembly 80. At least a portion of the sealing member 43 is located between the electrode post protrusion 42 and the top cover 30.

[0220] The pole post protrusion 42 is connected to the outer peripheral wall of the pole post body 41, and the pole post protrusion 42 is in the form of a ring surrounding the pole post body 41.

[0221] The first limiting segment 521 and the second limiting segment 522 can be set at an angle, for example, the first limiting segment 521 and the second limiting segment 522 can be set approximately perpendicularly. The mounting part 51 can be set at an angle to the first limiting segment 521. The mounting part 51 can be set approximately perpendicular to the first limiting segment 521. The mounting part 51 can be set approximately parallel to the second limiting segment 522. The mounting part 51 can be set approximately parallel to the top cover 30. For example, the mounting part 51 can be stacked with the top cover 30 along the thickness direction of the top cover 30.

[0222] For example, the mounting ring 50 can be formed by bending or sheet metal processing.

[0223] At least a portion of the seal 43 is located between the pole post protrusion 42 and the top cover 30. For example, a portion of the seal 43 may be located between the pole post protrusion 42 and the top cover 30, or the entire seal 43 may be located between the pole post protrusion 42 and the top cover 30.

[0224] In the above technical solution, by setting the electrode post 40 as the electrode post body 41 and the electrode post protrusion 42 connected to the outer periphery of the electrode post body 41, and setting the limiting part 52 of the mounting ring 50 as including a first limiting segment 521 and a second limiting segment 522, the first limiting segment 521 can be made to surround the outer periphery of the electrode post protrusion 42 to limit the electrode post 40, and at least a part of the sealing member 43 is located between the electrode post protrusion 42 and the top cover 30. The second limiting segment 522 is located on the side of the electrode post protrusion 42 away from the electrode assembly 80. In this way, the second limiting segment 522 of the mounting ring 50 and the top cover 30 can limit and compress the sealing member 43, thereby improving the sealing effect.

[0225] In some embodiments, refer to Figure 5 and Figure 6 The tab 83 includes a tab root 831 and a tab body 832. The tab root 831 connects the electrode body 81 and the tab body 832. The tab body 832 is bent and connected to the electrode post 40. The battery cell 100 is a square battery, and the top cover 30 is rectangular. The dimension of the tab root 831 in the width direction of the top cover 30 is W6, where W6 ≤ 32 mm.

[0226] The electrode assembly 80 includes at least one electrode group, which can be formed by winding electrode sheets or by stacking multiple electrode sheets. Each electrode sheet includes an electrode body and a tab, with the tab connected to one side of the electrode body. The electrode body 81 includes the electrode body, and the tab 83 is formed by stacking multiple tabs. The multiple tabs of the tab 83 are stacked along the width direction of the top cover 30. The size of the tab root 831 in the width direction of the top cover 30 characterizes the stacking size of the tab 83 in the width direction of the top cover 30. The larger the size of the tab root 831 in the width direction of the top cover 30, the more tabs the tab 83 contains.

[0227] By limiting the dimension of the base 831 of the electrode tab in the width direction of the top cover 30 to no more than 32mm, the number of electrode tabs included in the electrode tab 83 can be limited. The more electrode tabs included in the electrode tab 83, the more difficult the bending process of the electrode tab 83 becomes, and the greater the length requirement for the electrode tab 83 also becomes.

[0228] Here is an explanation of the length of the tab 83: Before the tab 83 is bent, the length of the tab 83 protruding relative to the electrode body 81 is the length of the tab 83.

[0229] In the above technical solution, by limiting the dimension of the electrode root 831 in the width direction of the top cover 30 to no more than 32mm, it is convenient to bend the electrode 83 during the manufacturing process, reducing the bending difficulty of the electrode 83, and also helping to reduce the length of the electrode 83, thereby helping to reduce the redundancy problem of the electrode 83, and thus helping to reduce the short circuit problem caused by the redundant insertion of the electrode 83 into the electrode body 81.

[0230] In some embodiments, refer to Figures 5-10 The top cover assembly 20 includes a first insulating structure 60, which is fixed to the side of the top cover 30 facing the electrode assembly 80. The first insulating structure 60 is provided with a first clearance hole 61 for avoiding the electrode post 40.

[0231] The first insulating structure 60 can be a plastic layer. The first insulating structure 60 can be bonded and fixed to the top cover 30, the first insulating structure 60 can be snapped and fixed to the top cover 30, and the first insulating structure 60 can be fixed to the top cover 30 by the joint clamping action of the top cover 30 and the tab 83.

[0232] For example, the first insulating structure 60 can be rectangular, circular, elliptical, or in the shape of a ring track.

[0233] In the above technical solution, by providing a first insulating structure 60 on the side of the top cover 30 facing the electrode assembly 80, the top cover 30 and the electrode assembly 80 can be insulated and separated, thus avoiding short circuit between the top cover 30 and the electrode assembly 80.

[0234] In some embodiments, refer to Figure 9 The first insulating structure 60 is provided with a first positioning protrusion 62, and the top cover 30 is provided with a first positioning hole, and the first positioning protrusion 62 is inserted into the first positioning hole.

[0235] For example, two first positioning protrusions 62 may be provided on the first insulating structure 60, and the two first positioning protrusions 62 may be provided at opposite ends of the first insulating structure 60 along the length direction of the top cover 30. Two corresponding first positioning holes are provided on the top cover 30 at positions corresponding to the first insulating structure 60, and the two first positioning protrusions 62 of the first insulating structure 60 are respectively inserted into the two corresponding first positioning holes on the top cover 30.

[0236] In the above technical solution, when the first insulating structure 60 is installed on the top cover 30, the first insulating structure 60 can be quickly fixed to the top cover 30 by inserting the first positioning protrusion 62 on the first insulating structure 60 into the first positioning hole on the top cover 30, and the first insulating structure 60 can be easily installed and removed.

[0237] In some embodiments, refer to Figures 9-13 The top cover 30 is provided with two pole hole 31, and two poles 40 with opposite polarities are installed in the two pole hole 31 respectively. There are two first insulation structures 60. One of the first insulation structures 60 has a first clearance hole 61 to avoid the positive pole 40, and the other first insulation structure 60 has a first clearance hole 61 to avoid the negative pole 40.

[0238] In the above technical solution, a first insulating structure 60 is provided near the two pole holes 31 of the top cover 30, which can achieve insulation separation between the top cover 30 and the positive electrode and the negative electrode of the electrode assembly 80.

[0239] In some embodiments, refer to Figures 9-13 The two first insulation structures are set apart by a distance of 60.

[0240] In the above technical solution, the two first insulating structures 60 are spaced apart, which makes the size of each first insulating structure 60 relatively small, thereby making the structural strength of a single first insulating structure 60 higher.

[0241] In some embodiments, refer to Figures 14-18 The two first insulating structures 60 are connected and integrally formed.

[0242] In the above technical solution, by making the two first insulating structures 60 integrally formed, the number of parts of the top cover assembly 20 can be reduced, and the assembly process can be reduced.

[0243] In some embodiments, refer to Figures 5-10 The battery cell 100 includes a second insulating structure 70, which is fixed to the electrode assembly 80 or the housing 10. At least a portion of the second insulating structure 70 is in contact with or connected to the tab 83 for fixing and supporting the tab 83.

[0244] The second insulating structure 70 can be made of plastic.

[0245] The second insulating structure 70 is located inside the housing 10 and can be installed and fixed to the electrode assembly 80 or the housing 10.

[0246] At least a portion of the second insulating structure 70 is in contact with or connected to the tab 83. This contact can be a partial contact or connection between the second insulating structure 70 and the tab 83, or the entire second insulating structure 70 can be in contact with or connected to the tab 83. The connection between the second insulating structure 70 and the tab 83 is achieved by adhesive bonding.

[0247] In the above technical solution, by setting a second insulating structure 70 and making at least a part of the second insulating structure 70 contact or connect with the electrode tab 83, the electrode tab 83 can be fixed and supported, reducing the risk of redundant insertion of the electrode body 81 into the electrode tab 83 during the bending process.

[0248] In some embodiments, refer to Figures 5-10 The second insulating structure 70 includes a support body 71 and at least one fixed support part 72. The support body 71 is fixed to the electrode body 81 or the housing 10. The support body 71 is provided with a second clearance hole 711 for avoiding the electrode tab 83. The fixed support part 72 is connected to the inner peripheral wall of the second clearance hole 711. The fixed support part 72 contacts the electrode tab 83 to fix and support the electrode tab 83.

[0249] The bracket body 71 can be integrally formed with the fixed support part 72, for example, the second insulation structure 70 can be an integrally formed part.

[0250] In the above technical solution, by setting the second insulating structure 70 to include a support body 71 and at least one fixed support part 72, and fixing the support body 71 to the electrode body 81 or the housing 10, it is convenient to install and fix the second insulating structure 70. Furthermore, by contacting the electrode tab 83 through at least one fixed support part 72, the electrode tab 83 is fixedly supported, thereby reducing the risk of redundant insertion of the electrode tab 83 into the electrode body 81 during the bending process.

[0251] In some embodiments, refer to Figures 5-10The electrode tab 83 includes an electrode tab root 831 and an electrode tab body 832. The electrode tab root 831 connects the electrode body 81 and the electrode tab body 832. The electrode tab body 832 is in a bent state and is connected to the electrode post 40. At least a portion of the electrode tab body 832 is located in the second clearance hole 711.

[0252] At least a portion of the tab body 832 is located within the second clearance hole 711. For example, a portion of the tab body 832 may be located within the second clearance hole 711, or the entire tab body 832 may be located within the second clearance hole 711.

[0253] In the above technical solution, by making at least a portion of the tab body 832 located within the second clearance hole 711 of the support body 71, the overall structure can be made compact, which is beneficial to improving the energy density of the battery cell 100.

[0254] In some embodiments, refer to Figures 5-10 At least part of the fixed support portion 72 is located on the side of the electrode body portion 832 facing the electrode body portion 81 to support the electrode body portion 832.

[0255] For example, some of the fixed support portions 72 may be located on the side of the tab body portion 832 facing the electrode body 81 to support the tab body portion 832; or all of the fixed support portions 72 may be located on the side of the tab body portion 832 facing the electrode body 81 to support the tab body portion 832.

[0256] In the above technical solution, by making at least part of the fixed support portion 72 located on the side of the tab body portion 832 facing the electrode body 81, the tab body portion 832 can be better supported. Furthermore, the fixed support portion 72 located between the tab body portion 832 and the electrode body 81 can also better separate the tab body portion 832 from the electrode body 81, which is more conducive to reducing the risk of redundant insertion of the tab body portion 832 into the electrode body 81.

[0257] In some embodiments, refer to Figures 5-10 At least part of the fixed support 72 covers the surface of the base of the pole ear 831 facing the top cover 30.

[0258] For example, a portion of the fixing support 72 may cover the surface of the tab root 831 facing the top cover 30, or all of the fixing support 72 may cover the surface of the tab root 831 facing the top cover 30.

[0259] In the above technical solution, by having at least a portion of the fixing support portion 72 cover the surface of the electrode root portion 831 facing the top cover 30, the electrode 83 can be shaped and fixed, and the electrode body portion 832 can be supported. Furthermore, the fixing support portion 72 located on the surface of the electrode root portion 831 facing the top cover 30 can effectively reduce the risk of redundant insertion of the electrode body portion 832 into the electrode body 81 or the electrode root portion 831.

[0260] In some embodiments, refer to Figures 5-10 The second clearance hole 711 is provided with a plurality of fixed support parts 72, which are arranged at intervals along the circumference of the second clearance hole 711 and are distributed at different positions of the tab 83.

[0261] In the above technical solution, by setting multiple fixed support parts 72, the electrode tab 83 can be better supported and shaped, reducing the risk of redundant insertion of the electrode tab 83. Furthermore, by arranging multiple fixed support parts 72 at intervals along the circumference of the second clearance hole 711, the electrode tab 83 can be supported and fixed at different positions, further reducing the risk of redundant insertion of the electrode tab 83.

[0262] In some embodiments, refer to Figures 5-10 The battery cell 100 is a square battery, the top cover 30 is rectangular, and multiple fixing support parts 72 are divided into two groups of fixing support parts. Each group of fixing support parts includes at least one fixing support part 72. The two groups of fixing support parts are arranged at intervals along the width direction of the top cover 30 to form a limiting opening 73 for the tab 83 to pass through between the two groups of fixing support parts.

[0263] Each set of fixed support components may include one fixed support component 72 or multiple fixed support components 72. The number of fixed support components 72 in two sets of fixed support components may be the same. When each set of fixed support components includes multiple fixed support components 72, the multiple fixed supports in each set of fixed support components may be arranged along the length direction of the top cover 30.

[0264] In the above technical solution, by dividing the multiple fixed support parts 72 into two groups of fixed support parts and arranging the two groups of fixed support parts at intervals along the width direction of the top cover 30, and defining a limiting opening 73 between the two groups of fixed support parts for the insertion of the electrode tab 83, the electrode tab 83 can be effectively supported and fixed in the width direction of the top cover 30 through the two groups of fixed support parts, and the overall structure is compact.

[0265] In some embodiments, refer to Figures 5-10The tab 83 includes a tab root 831 and a tab body 832. The tab root 831 connects the electrode body 81 and the tab body 832. The tab body 832 is bent and connected to the pole post 40. The connection position between the tab body 832 and the tab root 831 is located within the limiting port 73. One set of fixed support parts is located on the side of the tab body 832 facing the electrode body 81 to support the tab body 832. Another set of fixed support parts covers the surface of the tab root 831 facing the top cover 30.

[0266] In the above technical solution, by positioning the connection between the tab root 831 and the tab body 832 within the limiting opening 73 defined between the two sets of fixed support parts, the tab body 832 can be positioned within the second clearance hole 711. Furthermore, by supporting and fixing the tab 83 with multiple fixed support parts 72, the risk of redundant insertion of the tab 83 can be reduced. Moreover, by positioning one set of fixed support parts on the side of the tab body 832 facing the electrode body 81, and the other set of fixed support parts covering the surface of the tab root 831 facing the top cover 30, effective support and fixing of the tab body 832 can be achieved, and the tab body 832 can be separated from the electrode body 81, reducing the risk of the tab body 832 being inserted into the tab root 831 or the electrode body 81.

[0267] In some embodiments, refer to Figure 6 The dimension of the limiting port 73 in the width direction of the top cover 30 is W5, where W5≤6mm.

[0268] In the above technical solution, by limiting the size of the limiting port 73 between the two sets of fixed support parts in the width direction of the top cover 30 to no more than 6mm, the fit between the tab 83 and the limiting port 73 can be made tight, reducing the fit gap between the tab 83 and the inner wall of the limiting port 73. This reduces the risk of liquids outside the battery cell 100 entering the electrode body 81 through the fit gap between the tab 83 and the inner wall of the limiting port 73.

[0269] In some embodiments, refer to Figure 5 The outer surface of the electrode body 81 is covered with an insulating protective film 82, and the support body 71 is connected and fixed to the insulating protective film 82.

[0270] In the above technical solution, by covering the outer surface of the electrode body 81 with an insulating protective film 82, the insulating protective film 82 can protect the electrode body 81 and make the electrode body 81 and the housing 10 insulated and separated. Furthermore, by fixing the bracket body 71 to the insulating protective film 82, the bracket body 71 can be conveniently installed and fixed.

[0271] In some embodiments, the support body 71 is thermally fused to the insulating protective film 82.

[0272] In the above technical solution, by thermally fusing the support body 71 and the insulating protective film 82, the connection between the support body 71 and the insulating protective film 82 can be made more reliable and the process is simpler.

[0273] In some embodiments, refer to Figure 6 The top cover assembly 20 includes a first insulating structure 60, which is fixed to the side of the top cover 30 facing the electrode assembly 80. The first insulating structure 60 is provided with a first clearance hole 61 for avoiding the electrode post 40. The dimension of the first insulating structure 60 in the width direction of the top cover 30 is W3, and the dimension of the second clearance hole 711 in the width direction of the top cover 30 is W4, where W3 ≥ W4.

[0274] In the above technical solution, by providing a first insulating structure 60 on the side of the top cover 30 facing the electrode assembly 80, the top cover 30 and the electrode assembly 80 can be insulated and separated, avoiding short circuit between the top cover 30 and the electrode assembly 80; by making the dimension of the first insulating structure 60 in the width direction of the top cover 30 greater than or equal to the dimension of the second clearance hole 711 in the width direction of the top cover 30, the first insulating structure 60 can cover the side of the second clearance hole 711 facing the top cover 30, reducing the risk of liquids or other substances outside the battery cell 100 entering the second clearance hole 711.

[0275] In some embodiments, refer to Figures 6-12 The top cover assembly 20 includes a first insulating structure 60, which is fixed to the side of the top cover 30 facing the electrode assembly 80. The first insulating structure 60 is provided with a first clearance hole 61 for avoiding the electrode post 40. The side of the bracket body 71 facing the top cover 30 is provided with a mating groove 701, which surrounds the outer periphery of the second clearance hole 711. The first insulating structure 60 is accommodated in the mating groove 701.

[0276] The mating groove 701 is connected to the second clearance hole 711, for example, the mating groove 701 penetrates the inner peripheral wall of the second clearance hole 711.

[0277] In the above technical solution, by providing a first insulating structure 60 on the side of the top cover 30 facing the electrode assembly 80, the top cover 30 and the electrode assembly 80 can be insulated and separated, avoiding short circuits caused by contact between the top cover 30 and the electrode assembly 80. By providing a mating groove 701 on the side of the bracket body 71 facing the top cover 30, and allowing the first insulating structure 60 to be accommodated in the mating groove 701, it is convenient to position the top cover assembly 20 when assembling the top cover assembly 20 with the housing 10 and the electrode assembly 80. Furthermore, by having the first insulating structure 60 on the top cover assembly 20 accommodated in the mating groove 701 of the second insulating structure 70, the second insulating structure 70 can also be limited, reducing the risk of the second insulating structure 70 moving relative to the top cover assembly 20. This reduces the risk of the second insulating structure 70 moving relative to the top cover assembly 20 and thus wearing the electrode tab 83.

[0278] In some embodiments, refer to Figure 6 The dimension of the groove 701 in the thickness direction of the top cover 30 is h1, and the dimension of the first insulating structure 60 in the thickness direction of the top cover 30 is h2, where h1 ≥ h2.

[0279] The dimension of the mating groove 701 in the thickness direction of the top cover 30 can be understood as the depth of the mating groove 701.

[0280] The dimension of the first insulating structure 60 in the thickness direction of the top cover 30 can be understood as the thickness of the first insulating structure 60.

[0281] In the above technical solution, by making the dimension of the mating groove 701 in the thickness direction of the top cover 30 greater than or equal to the dimension of the first insulating structure 60 in the thickness direction of the top cover 30, the first insulating structure 60 can be completely accommodated in the mating groove 701, which is beneficial to reduce the dimension of the battery cell 100 in the thickness direction of the top cover 30, making the structure of the battery cell 100 more compact, and improving the energy density of the battery cell 100.

[0282] In some embodiments, refer to Figure 6 The dimension of the groove 701 in the thickness direction of the top cover 30 is h1, where h1 ≥ 0.5 mm.

[0283] In the above technical solution, by making the dimension of the mating groove 701 in the thickness direction of the top cover 30 greater than or equal to 0.5mm, the mating groove 701 can have sufficient depth to accommodate the first insulating structure 60.

[0284] In some embodiments, refer to Figure 6The dimension of the groove 701 in the thickness direction of the top cover 30 is h1, h1≥0.5mm; and / or the dimension of the first insulating structure 60 in the thickness direction of the top cover 30 is h2, h2≥0.5mm.

[0285] In the above technical solution, by making the dimension of the first insulating structure 60 in the thickness direction of the top cover 30 greater than or equal to 0.5mm, the first insulating structure 60 can have sufficient thickness to meet the requirements of insulation, structural strength, etc.

[0286] In some embodiments, refer to Figure 6 The outer peripheral sidewall of the first insulating structure 60 is provided with a clearance slope 63. In the direction from the top cover 30 to the electrode assembly 80, the clearance slope 63 extends obliquely toward the central axis direction close to the second clearance hole 711.

[0287] The avoidance slope 63 can be arranged around the first insulating structure 60, for example, the avoidance slope 63 can be in the form of a ring around the first insulating structure 60.

[0288] The circumferential direction of the first insulating structure 60 is consistent with the circumferential direction of the pole post 40.

[0289] For example, the clearance slope 63 can be a plane, and the clearance slope 63 can be set at one end of the bottom wall of the first insulating structure 60 near the mating groove 701.

[0290] In the above technical solution, by providing a clearance slope 63 on the outer peripheral sidewall of the first insulating structure 60, when assembling the top cover assembly 20 with the housing 10, the clearance slope 63 facilitates the first insulating structure 60 to be accommodated in the mating groove 701 of the second insulating structure 70, thereby reducing the problem of interference between the first insulating structure 60 and the second insulating structure 70 during the assembly process, making the assembly more convenient and smooth.

[0291] In some embodiments, refer to Figure 11 and Figure 12 The groove 701 extends through the support body 71 along the width direction of the top cover 30.

[0292] In the above technical solution, by making the mating groove 701 penetrate through the support body 71 along the width direction of the top cover 30, the area of ​​the mating groove 701 can be made larger, thereby increasing the accommodating space of the mating groove 701 and increasing the mating area between the first insulating structure 60 and the second insulating structure 70, which is beneficial to improving the stability of the mating between the first insulating structure 60 and the second insulating structure 70.

[0293] In some embodiments, the bracket body 71 contacts or is connected to the top cover assembly 20.

[0294] In the above technical solution, by making the bracket body 71 contact or connect with the top cover assembly 20, the top cover assembly 20 can limit the second insulating structure 70, which can reduce the risk of the second insulating structure 70 moving relative to the top cover assembly 20, thereby reducing the risk of the second insulating structure 70 moving relative to the top cover assembly 20 and wearing the tab 83.

[0295] In some embodiments, refer to Figures 14-18 The top cover assembly 20 includes a first insulating structure 60, which is fixed to the side of the top cover 30 facing the electrode assembly 80. The first insulating structure 60 is provided with a first clearance hole 61 for avoiding the electrode post 40. The bracket body 71 is connected to the first insulating structure 60.

[0296] In the above technical solution, by providing a first insulating structure 60 on the side of the top cover 30 facing the electrode assembly 80, the top cover 30 and the electrode assembly 80 can be insulated and separated, avoiding short circuit between the top cover 30 and the electrode assembly 80; and by connecting the bracket body 71 to the first insulating structure 60, the second insulating structure 70 can be limited, reducing the risk of the second insulating structure 70 moving relative to the top cover assembly 20, thereby reducing the risk of the second insulating structure 70 moving relative to the top cover assembly 20 and wearing the tab 83.

[0297] In some embodiments, refer to Figures 14-18 The main body of the bracket 71 is snapped into the first insulating structure 60.

[0298] In the above technical solution, by setting the connection method between the support body 71 and the first insulating structure 60 to a snap-fit ​​connection, the connection between the first insulating structure 60 and the support body 71 can be facilitated, making the connection operation between the two simple.

[0299] In some embodiments, at least a portion of the first insulating structure 60 is stacked with the support body 71 in the thickness direction of the top cover 30, and the support body 71 and the first insulating structure 60 are engaged along the thickness direction of the top cover 30.

[0300] In the above technical solution, by making the bracket body 71 and the first insulating structure 60 snap together along the thickness direction of the top cover 30, the snap connection between the bracket body 71 and the first insulating structure 60 is completed when the top cover assembly 20 is assembled onto the housing 10. That is, the snap connection between the bracket body 71 and the first insulating structure 60 can be achieved by using the assembly force between the top cover assembly 20 and the housing 10, which simplifies the assembly process.

[0301] In some embodiments, refer to Figures 14-18One of the bracket body 71 and the first insulating structure 60 is provided with a second positioning protrusion 64 and the other is provided with a second positioning hole 712. The second positioning protrusion 64 is inserted into the first positioning hole along the thickness direction of the top cover 30.

[0302] For example, the bracket body 71 is provided with a second positioning protrusion 64, and the first insulating structure 60 is provided with a second positioning hole 712; or, the bracket body 71 is provided with a second positioning hole 712, and the first insulating structure 60 is provided with a second positioning protrusion 64.

[0303] In the above technical solution, when the top cover assembly 20 is assembled onto the housing 10, the first insulating structure 60 and the bracket body 71 can be easily connected by inserting the second positioning protrusion 64 into the second positioning hole 712 along the thickness direction of the top cover 30.

[0304] In some embodiments, refer to Figures 14-18 The top cover 30 is provided with two pole hole 31, and two poles 40 with opposite polarities are installed in the two pole hole 31 respectively. There are two second insulation structures 70. One of the second insulation structures 70 has a second clearance hole 711 to avoid the positive pole tab 83, and the other second insulation structure 70 has a second clearance hole 711 to avoid the negative pole tab 83.

[0305] The two poles 40 with opposite polarities are the positive pole 40 and the negative pole 40, respectively. The positive pole 40 is connected to the positive pole tab 83, and the negative pole 40 is connected to the negative pole tab 83.

[0306] The two pole holes 31 on the top cover 30 can be arranged at intervals along the length of the top cover 30. Correspondingly, the two tabs 83 of the electrode assembly 80 can be arranged along the length of the top cover 30, and the two second insulating structures 70 can be arranged along the length of the top cover 30.

[0307] In the above technical solution, by setting two second insulating structures 70, the positive electrode tab 83 and the negative electrode tab 83 are respectively supported and fixed, which can reduce the risk of redundant insertion of the positive electrode tab 83 and the negative electrode tab 83.

[0308] In some embodiments, refer to Figures 14-15 Two second insulation structures are set apart at a distance of 70.

[0309] In the above technical solution, the two second insulating structures 70 are spaced apart, which makes the size of each second insulating structure 70 relatively small, thereby making the structural strength of a single second insulating structure 70 higher.

[0310] In some embodiments, refer to Figures 16-18The two second insulation structures 70 are connected and integrally formed.

[0311] In the above technical solution, by making the two second insulating structures 70 integrally formed, the number of parts of the top cover assembly 20 can be reduced, and the assembly process can be reduced.

[0312] In some embodiments, refer to Figures 19-22 The battery cell 100 is a square battery, the top cover 30 is rectangular, and two terminal holes 31 are arranged at intervals along the length of the top cover 30. Each second insulating structure 70 includes a first sub-support 74 and a second sub-support 75 arranged and connected along the width of the top cover 30. The first sub-support 74 and the second sub-support 75 of each second insulating structure 70 together define a second clearance hole 711. The first sub-support 74 and the second sub-support 75 are both independently molded parts.

[0313] The first sub-support 74 and the second sub-support 75 can have the same structure.

[0314] In the above technical solution, by setting each second insulating structure 70 to include a first sub-support 74 and a second sub-support 75 connected along the width direction of the top cover 30, the first sub-support 74 and the second sub-support 75 of the second insulating structure 70 can be connected along the width direction of the top cover 30 and the tab 83 is clamped between the first sub-support 74 and the second sub-support 75, which facilitates the installation of the second insulating structure 70 and facilitates the cooperation between the second insulating structure 70 and the tab 83.

[0315] In some embodiments, refer to Figures 19-22 The first sub-bracket 74 and the second sub-bracket 75 are snapped together.

[0316] For example, the first sub-support 74 is provided with a third positioning protrusion 77 or a third positioning hole 76, and the second sub-support 75 is provided with a third positioning hole 76 or a third positioning protrusion 77. When the first sub-support 74 and the second sub-support 75 are assembled to form the second insulating structure 70, the third positioning protrusion 77 can be inserted into the third positioning hole 76.

[0317] In the above technical solution, by making the first sub-support 74 and the second sub-support 75 snap-fit ​​together, it is convenient for the first sub-support 74 and the second sub-support 75 to be connected to form the second insulating structure 70, and it is also convenient for the first sub-support 74 and the second sub-support 75 to be disassembled, so as to facilitate the adjustment of the fit between the electrode tab 83 and the second insulating structure 70.

[0318] In some embodiments, refer to Figures 19-22 The first sub-supports 74 of the two second insulating structures 70 are formed independently, and the two second insulating structures 70 are formed independently.

[0319] In the above technical solution, by making the first sub-supports 74 of the two second insulating structures 70 independently formed and the two second insulating structures 70 independently formed, the installation process of the two second insulating structures 70 can be decoupled, making the installation of the two second insulating structures 70 more flexible.

[0320] In some embodiments, refer to Figure 8 The first sub-support 74 of the two second insulation structures 70 is integrally formed, and the second sub-support 75 of the two second insulation structures 70 is integrally formed.

[0321] In the above technical solution, by making the first sub-support 74 of the two second insulation structures 70 integrally formed and the second sub-support 75 of the two second insulation structures 70 integrally formed, when assembling the second insulation structures 70 corresponding to the positive electrode tab 83 and the negative electrode tab 83, the first sub-support 74 and the second sub-support 75 are connected along the width direction of the top cover 30, so that the two second insulation structures 70 can be assembled, reducing the assembly process.

[0322] In some embodiments, refer to Figure 6 The battery cell 100 is a square battery, and the top cover 30 is rectangular. The width of the top cover 30 is W1, and 30mm≤W1≤38mm.

[0323] In the above technical solution, the second insulating structure 70 is configured to include the above-mentioned support body 71 and at least one fixed support part 72, and a top cover 30 with a width range of 30mm to 38mm is matched. The second insulating structure 70 can realize the supporting and shaping function of the tab 83 corresponding to the top cover 30 with the width range, which can effectively reduce the risk of redundant insertion of the tab 83.

[0324] In some embodiments, refer to Figure 22 The second insulating structure 70 includes at least one fixed support piece 78, which is bonded and fixed to the tab 83.

[0325] The fixing support piece 78 can be a plastic sheet or a film with an adhesive backing.

[0326] In the above technical solution, by setting the second insulation structure 70 to include at least one fixed support piece 78, and fixing the fixed support piece 78 to the electrode tab 83 to support and fix the electrode tab 83, the second insulation structure 70 can be made simple and occupy less space.

[0327] In some embodiments, refer to Figure 22 There are multiple fixed support pieces 78, which are bonded and fixed at different positions on the surface of the tab 83.

[0328] In the above technical solution, by setting multiple fixed support pieces 78, and each of the multiple fixed support pieces 78 is bonded and fixed to different positions on the tab 83, the support and fixation of different positions of the tab 83 can be achieved, further reducing the risk of redundant insertion of the tab 83.

[0329] In some embodiments, refer to Figure 22 The tab 83 includes a tab root 831 and a tab body 832. The tab root 831 connects the electrode body 81 and the tab body 832. The tab body 832 is bent and connected to the pole post 40. At least a portion of the fixing support piece 78 is bonded and fixed to the surface of the tab body 832, and at least a portion of the fixing support piece 78 is bonded and fixed to the surface of the tab root 831.

[0330] In the above technical solution, by bonding and fixing at least a portion of the fixing support piece 78 to the surface of the tab body 832, the tab body 832 in a bent state is supported and shaped, reducing the risk of redundant insertion of the tab body 832 into the electrode body 81 or the tab root 831; by bonding and fixing at least a portion of the fixing support piece 78 to the tab root 831, the tab root 831 can be fixed, and the tab body 832 and the electrode body 81 can be separated by the fixing support piece 78, further reducing the risk of redundant insertion of the tab 83.

[0331] In some embodiments, refer to Figure 22 The battery cell 100 is a square battery, and the top cover 30 is rectangular. The width of the top cover 30 is W1, and W1≤28mm.

[0332] In the above technical solution, the second insulating structure 70 is configured to include at least one fixed support piece 78, and a top cover 30 with a width of no more than 28mm is matched. The second insulating structure 70 can provide support and shaping for the tabs 83 corresponding to the top cover 30 within the width range, which can effectively reduce the risk of redundant insertion of the tabs 83.

[0333] Secondly, referring to Figures 23-26 This utility model provides an assembly process for a battery cell 100, including:

[0334] The top cover assembly 20 and the electrode assembly 80 are respectively assembled. The top cover assembly 20 includes a top cover 30, an electrode post 40 and a sealing element 43. The electrode assembly 80 includes an electrode tab 83 in an unbent state.

[0335] The electrode assembly 80 is placed into the housing 10, and the tab 83, which is in an unbent state, extends out of the housing 10 through the opening 11 to the top of the housing 10.

[0336] The top cover assembly 20 is placed on top of the housing 10 in the first placement state;

[0337] Connect the tab 83, which is in an unbent state, to the pole post 40 of the top cover assembly 20;

[0338] The top cover assembly 20 is flipped to a preset angle to the second placement state. The top cover assembly 20 covers the opening 11 of the housing 10. The electrode tab 83, which is in an unbent state, is bent under the flipping action of the top cover assembly 20 to form the electrode tab 83 in a bent state.

[0339] Connect the top cover 30 to the housing 10.

[0340] The electrode assembly 80 is placed into the housing 10, meaning that the electrode body 81 of the electrode assembly 80 is completely contained within the housing 10. When the electrode assembly 80 is placed into the housing 10, the electrode body 81 of the electrode assembly 80 can be accommodated into the housing 10 through the opening 11 of the housing 10, and at least a portion of the tab 83 is located above the housing 10, for example, the tab body portion 832 of the tab 83 is located above the housing 10.

[0341] The tab 83, in its unbent state, extends roughly in the vertical direction.

[0342] When the top cover assembly 20 is in the first placement state, the top cover assembly 20 does not cover the opening 11 of the housing 10. The thickness direction of the top cover 30 can be roughly consistent with the horizontal direction. For example, the thickness direction of the top cover 30 of the top cover assembly 20 can be set along the width direction of the opening 11. At this time, the central axis of the pole post 40 on the top cover assembly 20 can extend along the width direction of the opening 11.

[0343] When the top cover assembly 20 is in the first placement state, the pole post 40 of the top cover assembly 20 is opposite to and in contact with the pole tab 83.

[0344] The tab 83, in its unbent state, can be connected to the pole post 40 of the top cover assembly 20 by welding. Since the top cover assembly 20 is in its first placement state at this time, sufficient operating space is provided for the connection between the tab 83 and the pole post 40, facilitating the connection operation.

[0345] When the top cover assembly 20 is in the second placement state, the top cover assembly 20 covers the opening 11 of the housing 10, and the thickness direction of the top cover 30 is consistent with the vertical direction. During the process of the top cover assembly 20 flipping from the first placement state to the second placement state, the electrode tab 83, which is in an unbent state in the first placement state, gradually bends under the flipping action of the top cover assembly 20. When the top cover assembly 20 is flipped to the second placement state, the electrode tab 83 bends to form a bent electrode tab 83.

[0346] For example, the top cover 30 and the housing 10 can be welded together to fix the top cover assembly 20 to the housing 10.

[0347] The battery cell 100 of the first aspect embodiment of the present invention can be assembled using the above-described assembly process.

[0348] In the above technical solution, during the assembly of the battery cell 100, the top cover assembly 20 is assembled, and the assembled electrode assembly 80 is assembled into the housing 10. The top cover assembly 20 is placed in a first placement state. In the first placement state, the terminal post 40 on the assembled top cover assembly 20 is connected to the electrode tab 83 on the electrode assembly 80 placed in the housing 10, which facilitates the connection operation between the terminal post 40 and the electrode tab 83. Then, the top cover assembly 20 is flipped over as a whole. After the top cover assembly 20 is flipped from the first placement state to the second placement state by a preset angle, the electrode tab 83 can be bent into a bent state by the flipping action of the top cover assembly 20. In the second placement state, the top cover 30 is connected to the housing 10. This assembly process can simplify the assembly process of the top cover assembly 20, the housing 10, and the electrode assembly 80, which is beneficial to shortening the manufacturing process of the battery cell 100 and improving the production efficiency of the battery cell 100.

[0349] In some embodiments, refer to Figures 23-26 The top cover 30 is rectangular, and the flipping axis of the top cover assembly 20 extends along the length of the top cover 30.

[0350] In the above technical solution, by making the flipping axis of the top cover assembly 20 extend along the length direction of the top cover 30, it is beneficial to reduce the length of the tab 83, thereby reducing the risk of redundant insertion of the tab 83; and it facilitates the flipping operation of the top cover assembly 20, reducing the pulling damage to the tab 83 during the flipping process.

[0351] In some embodiments, the width of the top cover 30 is W1, where W1 ≤ 40 mm.

[0352] In the above technical solution, by setting the width of the top cover 30 to no more than 40mm, the width of the top cover 30 is smaller, which makes it easier to connect the pole post 40 on the top cover 30 to the tab 83 of the electrode assembly 80, and also helps to reduce the length of the tab 83, thereby reducing the redundancy problem of the tab 83, and thus reducing the short circuit problem caused by the redundant insertion of the tab 83 into the electrode body 81.

[0353] In some embodiments, the top cover 30 is a one-piece molded part.

[0354] In the above technical solution, by setting the top cover 30 of the battery cell 100 as an integrally formed part, the number of welds on the top cover 30 can be reduced. Due to the reduction in the number of welds, welding quality problems caused by the welding of the top cover 30 itself can be reduced. For example, welding quality problems such as welding deformation of the top cover 30 can be reduced, and interference between welds can also be reduced, which is conducive to improving the yield of the top cover 30. It can also reduce the difficulty of judging the leakage location during helium detection, and reduce welding processes, which is conducive to shortening the process and improving production efficiency. In addition, by setting the sealing element 43 between the pole post 40 and the top cover 30 and setting the top cover 30 as an integrally formed part, the problem of poor compression effect of the sealing element 43 due to welding deformation of the top cover 30 can be avoided. This makes the overall structural strength of the top cover 30 better, so the top cover 30 has higher compressive strength and better compression effect on the sealing element 43, and achieves better sealing performance of the top cover assembly 20.

[0355] In some embodiments, refer to Figures 23-26 The electrode 83 includes an electrode root 831 and an electrode body 832. The electrode root 831 connects the electrode body 81 and the electrode body 832. In the first placement state, at least a portion of the electrode body 832 is located above the housing 10, and the electrode post 40 of the top cover assembly 20 is attached to and welded to the electrode body 832 in the unbent state.

[0356] In the above technical solution, by placing the electrode body 832 of the electrode 83 above the housing 10, and making the pole post 40 of the top cover assembly 20 fit against the electrode body 832 in an unbent state, it is convenient to weld the electrode body 832 to the pole post 40 on the top cover assembly 20.

[0357] In some embodiments, the preset angle is 70° to 110°.

[0358] For example, the preset angle can be 70°, 75°, 80°, 85°, 90°, 95°, 100°, 105°, 110°, etc.

[0359] In the above technical solution, by setting the flipping angle of the top cover assembly 20 between 70° and 110°, it is convenient to flip the top cover assembly 20. When the top cover assembly 20 is in the first placement state, the thickness direction of the top cover assembly 20 can be set roughly in the horizontal direction, which can provide sufficient space for the connection operation between the pole post 40 on the top cover assembly 20 and the electrode tab 83 on the electrode assembly 80, making the connection operation between the electrode tab 83 and the pole post 40 easier.

[0360] In some embodiments, refer to Figures 23-26 Assemble the top cover assembly 20, including:

[0361] The sealing element 43 is fitted onto the outer periphery of the pole post 40;

[0362] The pole post 40, which is fitted with the sealing element 43, is installed in the pole post hole 31 of the top cover 30, such that the sealing element 43 is located between the pole post 40 and the top cover 30.

[0363] The seal 43 is elastic and can be fitted onto the outer periphery of the pole post 40 to form a whole.

[0364] The pole post 40, which is fitted with a sealing element 43, is inserted into the pole post hole 31. In this way, the sealing element 43 can be located between the pole post 40 and the top cover 30. The sealing element 43 is compressed by the assembly force between the pole post 40 and the top cover 30, thereby improving the sealing effect.

[0365] In the above technical solution, by fitting the sealing element 43 onto the pole post 40 and then installing it as a whole into the pole post hole 31, the assembly process of the top cover assembly 20 is less difficult. Furthermore, by positioning the sealing element 43 between the pole post 40 and the top cover 30, the sealing effect of the sealing element 43 can be improved through the combined compression action of the pole post 40 and the top cover 30 on the sealing element 43.

[0366] In some embodiments, refer to Figures 23-26 Before the electrode assembly 80 is placed into the housing 10, the assembly process of the battery cell 100 further includes: fixing the second insulating structure 70 to the electrode assembly 80, and making at least a portion of the second insulating structure 70 contact or connect with the tab 83 to fix and support the tab 83.

[0367] For example, when the second insulating structure 70 includes a support body 71 and at least one fixed support part 72, the support body 71 can be fixed to the insulating protective film 82 outside the electrode body 81. The support body 71 is provided with a second clearance hole 711. When installing the second insulating structure 70, the support body 71 of the second insulating structure 70 can be passed through the tab 83 and moved along the tab 83 toward the direction close to the electrode body 81. At this time, the tab 83 passes through the second clearance hole 711 on the support body 71. After the second insulating structure 70 is installed in place, the fixed support part 72 of the second insulating structure 70 cooperates with the tab 83 to support and fix the tab 83, and connects the support body 71 to the insulating protective film 82 outside the electrode body 81, so that the second insulating structure 70 can be installed and fixed to the electrode assembly 80.

[0368] For example, when the second insulation structure 70 includes at least one fixed support piece 78, the fixed support piece 78 can be bonded and fixed to the tab 83.

[0369] In the above technical solution, before the electrode assembly 80 is placed into the housing 10, the second insulating structure 70 is fixed to the electrode assembly 80 to facilitate the installation of the second insulating structure 70. During the process of the top cover assembly 20 flipping from the first placement state to the second placement state, the electrode tab 83 is driven to bend to a bent state. During this process, the second insulating structure 70 can play a supporting and shaping role for the electrode tab 83, reducing the risk of redundant insertion of the electrode tab 83 into the electrode body 81.

[0370] In some embodiments, refer to Figures 23-26 The top cover assembly 20 includes a first insulating structure 60 disposed on the top cover 30. During the process of flipping the top cover assembly 20 to a preset angle to a second placement state, the second insulating structure 70 engages with the first insulating structure 60.

[0371] For example, one of the second insulating structure 70 and the first insulating structure 60 is provided with a second positioning protrusion 64 and the other is provided with a second positioning hole 712. The second positioning protrusion 64 is inserted into the first positioning hole along the thickness direction of the top cover 30.

[0372] In the above technical solution, by providing a first insulating structure 60 on the side of the top cover 30 facing the electrode assembly 80, the top cover 30 and the electrode assembly 80 can be insulated and separated, avoiding short circuit between the top cover 30 and the electrode assembly 80. Furthermore, during the process of flipping the top cover assembly 20 to the second placement state, the second insulating structure 70 and the first insulating structure 60 can be snapped together. In this way, the top cover assembly 20 can limit the second insulating structure 70, reducing the risk of the second insulating structure 70 moving relative to the top cover assembly 20, thereby reducing the risk of the second insulating structure 70 moving relative to the top cover assembly 20 and wearing the electrode tab 83.

[0373] Thirdly, referring to Figure 27 The present invention provides a battery device 200, comprising: a housing 201 and a battery cell 100 according to the first aspect embodiment of the present invention, wherein the battery cell 100 is disposed within the housing 201.

[0374] In the above technical solution, by setting the battery cell 100, the top cover assembly 20 of the battery cell 100 has a high yield, a short process and a good sealing effect during the production process, which is conducive to improving the production efficiency and overall performance of the battery device 200.

[0375] Fourthly, the present invention provides an electrical device 1000, including a battery device 200 according to the third aspect embodiment of the present invention described above.

[0376] The electrical device 1000 can be a vehicle, and the battery device 200 can be installed at the bottom of the vehicle body 300.

[0377] In the above technical solution, by setting up the battery device 200, which includes a battery cell 100, the top cover assembly 20 of the battery cell 100 has a high yield, a short process and a good sealing effect during the production process, which is conducive to improving the production efficiency and overall performance of the battery device 200.

[0378] The following reference Figures 1-26 The present invention describes a battery cell 100 and its assembly process according to several embodiments of the present invention.

[0379] Reference Figures 1-9 In some embodiments of this utility model, the battery cell 100 is a square battery, and the battery cell 100 includes a housing 10, a top cover assembly 20, an electrode assembly 80, and a second insulating structure 70. The housing 10 has an opening 11, which is sealed by the top cover assembly 20. The top cover assembly 20 and the housing 10 together define a receiving cavity 12. The top cover assembly 20 includes a top cover 30, terminals 40, a sealing element 43, a mounting ring 50, and a first insulating structure 60. The top cover 30 is rectangular and has two terminal holes 31, which are spaced apart along the length of the top cover 30. There are two terminals 40, one of which is a positive terminal 40 and the other is a negative terminal 40. The two terminals 40 are respectively installed in the two terminal holes 31. The sealing element 43 is made of insulating material and is arranged around the electrode post 40. The sealing element 43 is located between the electrode post 40 and the top cover 30. The top cover 30 is an integrally formed part. The electrode assembly 80 is located in the receiving cavity 12 and includes an electrode body 81 and an electrode tab 83 connected to the electrode body 81. The electrode tab 83 is connected to the electrode post 40.

[0380] A mounting ring 50 is connected to the outside of the top cover 30 and surrounds the pole post 40 for mounting and fixing the pole post 40. The mounting ring 50 is a metal part, and an insulating layer 53 is provided between the mounting ring 50 and the pole post 40. The mounting ring 50 includes a mounting part 51 and a limiting part 52. The limiting part 52 surrounds the outer periphery of the pole post 40, and the mounting part 51 is connected to the outer periphery of the limiting part 52 and connected to the top cover 30. The outer surface of the cover is provided with a mounting groove 32, which surrounds the pole post hole 31 and penetrates the inner peripheral wall of the pole post hole 31. The mounting part 51 is accommodated in the mounting groove 32.

[0381] The electrode post 40 includes an electrode post body 41 and an electrode post protrusion 42. The electrode post protrusion 42 is connected to the outer peripheral wall of the electrode post body 41 and is disposed around the electrode post body 41. The limiting part 52 includes a first limiting segment 521 and a second limiting segment 522. The first limiting segment 521 is connected between the mounting part 51 and the second limiting segment 522. The first limiting segment 521 surrounds the outer peripheral side of the electrode post protrusion 42. The second limiting segment 522 is located on the side of the electrode post protrusion 42 away from the electrode assembly 80. At least a portion of the sealing member 43 is located between the electrode post protrusion 42 and the top cover 30.

[0382] The first insulating structure 60 is fixed to the side of the top cover 30 facing the electrode assembly 80. The first insulating structure 60 is provided with a first clearance hole 61 for avoiding the electrode post 40. There are two first insulating structures 60, which are arranged at intervals along the length of the top cover 30. Each first insulating structure 60 is an integrally formed part. The first clearance hole 61 on one first insulating structure 60 is used to avoid the electrode post 40 of the positive electrode, and the first clearance hole 61 on the other first insulating structure 60 is used to avoid the electrode post 40 of the negative electrode.

[0383] The second insulating structure 70 includes a support body 71 and two fixed support parts 72. The outer surface of the electrode body 81 is covered with an insulating protective film 82, and the support body 71 is connected and fixed to the insulating protective film 82. The support body 71 is provided with a second clearance hole 711 for avoiding the electrode tab 83. The fixed support parts 72 are connected to the inner peripheral wall of the second clearance hole 711. The two fixed support parts 72 are spaced apart along the width direction of the top cover 30, and a limiting opening 73 is defined between the two fixed support parts 72. The tab 83 includes a tab root 831 and a tab body 832. The tab root 831 connects the electrode body 81 and the tab body 832. The tab body 832 is bent and connected to the pole post 40. The connection position between the tab body 832 and the tab root 831 is located inside the limiting port 73. One fixed support part 72 is located on the side of the tab body 832 facing the electrode body 81 to support the tab body 832. The other fixed support part 72 covers the surface of the tab root 831 facing the top cover 30.

[0384] The support body 71 has a mating groove 701 on the side facing the top cover 30. The mating groove 701 surrounds the outer periphery of the second clearance hole 711, and the first insulating structure 60 is accommodated in the mating groove 701. The outer periphery of the first insulating structure 60 has a clearance slope 63. In the direction from the top cover 30 to the electrode assembly 80, the clearance slope 63 extends obliquely toward the central axis of the second clearance hole 711.

[0385] There are two second insulating structures 70. One of the second insulating structures 70 has a second clearance hole 711 to avoid the tab 83 of the positive electrode, and the other second insulating structure 70 has a second clearance hole 711 to avoid the tab 83 of the negative electrode. The two second insulating structures 70 are connected and integrally formed.

[0386] In this embodiment, reference is made to Figure 23 The assembly process of the battery cell 100 may include the following steps:

[0387] Assemble electrode assembly 80 by ultrasonically pre-welding multiple tabs on the wound electrode sheet to form tabs 83;

[0388] Insert the electrode assembly 80 into the housing, place the electrode body 81 of the electrode assembly 80 into the housing 10, and position the electrode tab 83 above the housing 10.

[0389] The second insulating structure 70 is moved from the free end of the electrode tab 83 along the electrode tab 83 into the housing 10, so that the electrode tab 83 passes through the second clearance hole 711 on the support body 71, and the support body 71 and the insulating protective film 82 outside the electrode body 81 are thermally fused together.

[0390] Assemble the top cover assembly 20, fit the sealing element 43 onto the outer periphery of the pole post 40, install the pole post 40 with the sealing element 43 fitted onto the pole post hole 31 of the top cover 30, and make the sealing element 43 located between the pole post 40 and the top cover 30, cover the outside of the mounting protrusion ring 50 with the insulating layer 53, then fit the mounting protrusion ring 50 with the insulating layer 53 onto the outer periphery of the pole post 40 and weld it to the outside of the top cover 30 for mounting and fixing the pole post 40, and fix the first insulating structure 60 to the inside of the top cover 30;

[0391] The top cover assembly 20 is connected to the electrode assembly 80. The top cover assembly 20 is placed on top of the housing 10 in a first placement state. The pole post 40 of the top cover assembly 20 is attached to and welded to the electrode body 832 in an unbent state.

[0392] Assemble the top cover assembly 20 with the housing 10, flip the top cover assembly 20 to a preset angle to the second placement state, and cover the top cover assembly 20 with the opening 11 of the housing 10. The electrode tab 83, which is in an unbent state, is bent under the flipping action of the top cover assembly 20 to form the electrode tab 83 in a bent state. Then weld the top cover 30 to the housing 10.

[0393] Reference Figures 10-13In some embodiments of this utility model, the battery cell 100 is a square battery, and the battery cell 100 includes a housing 10, a top cover assembly 20, an electrode assembly 80, and a second insulating structure 70. The housing 10 has an opening 11, which is sealed by the top cover assembly 20. The top cover assembly 20 and the housing 10 together define a receiving cavity 12. The top cover assembly 20 includes a top cover 30, terminals 40, a sealing element 43, a mounting ring 50, and a first insulating structure 60. The top cover 30 is rectangular and has two terminal holes 31, which are spaced apart along the length of the top cover 30. There are two terminals 40, one of which is a positive terminal 40 and the other is a negative terminal 40. The two terminals 40 are respectively installed in the two terminal holes 31. The sealing element 43 is made of insulating material and is arranged around the electrode post 40. The sealing element 43 is located between the electrode post 40 and the top cover 30. The top cover 30 is an integrally formed part. The electrode assembly 80 is located in the receiving cavity 12 and includes an electrode body 81 and an electrode tab 83 connected to the electrode body 81. The electrode tab 83 is connected to the electrode post 40.

[0394] A mounting ring 50 is connected to the outside of the top cover 30 and surrounds the pole post 40 for mounting and fixing the pole post 40. The mounting ring 50 is a metal part, and an insulating layer 53 is provided between the mounting ring 50 and the pole post 40. The mounting ring 50 includes a mounting part 51 and a limiting part 52. The limiting part 52 surrounds the outer periphery of the pole post 40, and the mounting part 51 is connected to the outer periphery of the limiting part 52 and connected to the top cover 30. The outer surface of the cover is provided with a mounting groove 32, which surrounds the pole post hole 31 and penetrates the inner peripheral wall of the pole post hole 31. The mounting part 51 is accommodated in the mounting groove 32.

[0395] The electrode post 40 includes an electrode post body 41 and an electrode post protrusion 42. The electrode post protrusion 42 is connected to the outer peripheral wall of the electrode post body 41 and is disposed around the electrode post body 41. The limiting part 52 includes a first limiting segment 521 and a second limiting segment 522. The first limiting segment 521 is connected between the mounting part 51 and the second limiting segment 522. The first limiting segment 521 surrounds the outer peripheral side of the electrode post protrusion 42. The second limiting segment 522 is located on the side of the electrode post protrusion 42 away from the electrode assembly 80. At least a portion of the sealing member 43 is located between the electrode post protrusion 42 and the top cover 30.

[0396] The first insulating structure 60 is fixed to the side of the top cover 30 facing the electrode assembly 80. The first insulating structure 60 has a first clearance hole 61 for avoiding the electrode post 40. There are two first insulating structures 60, which are arranged at intervals along the length of the top cover 30. The first clearance hole 61 on one first insulating structure 60 is used to avoid the electrode post 40 of the positive electrode, and the first clearance hole 61 on the other first insulating structure 60 is used to avoid the electrode post 40 of the negative electrode. Each first insulating structure 60 includes a detachably connected third sub-support 65 and a fourth sub-support 66, which are arranged along the width of the top cover 30. The third sub-support 65 has a fourth positioning protrusion 68 or a fourth positioning hole 67, and the fourth sub-support 66 has a fourth positioning hole 67 or a fourth positioning protrusion 68. The fourth positioning protrusion 68 is inserted into the fourth positioning hole 67 to realize the snap-fit ​​connection between the third sub-support 65 and the fourth sub-support 66.

[0397] The second insulating structure 70 includes a support body 71 and two fixed support parts 72. The outer surface of the electrode body 81 is covered with an insulating protective film 82, and the support body 71 is connected and fixed to the insulating protective film 82. The support body 71 is provided with a second clearance hole 711 for avoiding the electrode tab 83. The fixed support parts 72 are connected to the inner peripheral wall of the second clearance hole 711. The two fixed support parts 72 are spaced apart along the width direction of the top cover 30, and a limiting opening 73 is defined between the two fixed support parts 72. The tab 83 includes a tab root 831 and a tab body 832. The tab root 831 connects the electrode body 81 and the tab body 832. The tab body 832 is bent and connected to the pole post 40. The connection position between the tab body 832 and the tab root 831 is located inside the limiting port 73. One fixed support part 72 is located on the side of the tab body 832 facing the electrode body 81 to support the tab body 832. The other fixed support part 72 covers the surface of the tab root 831 facing the top cover 30.

[0398] The support body 71 has a mating groove 701 on the side facing the top cover 30. The mating groove 701 surrounds the outer periphery of the second clearance hole 711, and the first insulating structure 60 is accommodated in the mating groove 701. The outer periphery of the first insulating structure 60 has a clearance slope 63. In the direction from the top cover 30 to the electrode assembly 80, the clearance slope 63 extends obliquely toward the central axis of the second clearance hole 711.

[0399] There are two second insulating structures 70. One of the second insulating structures 70 has a second clearance hole 711 to avoid the tab 83 of the positive electrode, and the other second insulating structure 70 has a second clearance hole 711 to avoid the tab 83 of the negative electrode. The two second insulating structures 70 are connected and integrally formed.

[0400] In this embodiment, reference is made to Figure 24 The assembly process of the battery cell 100 may include the following steps:

[0401] Assemble electrode assembly 80 by ultrasonically pre-welding multiple tabs on the wound electrode sheet to form tabs 83;

[0402] Insert the electrode assembly 80 into the housing, place the electrode body 81 of the electrode assembly 80 into the housing 10, and position the electrode tab 83 above the housing 10.

[0403] The second insulating structure 70 is moved from the free end of the electrode tab 83 along the electrode tab 83 into the housing 10, so that the electrode tab 83 passes through the second clearance hole 711 on the support body 71, and the support body 71 and the insulating protective film 82 outside the electrode body 81 are thermally fused together.

[0404] Assemble the top cover assembly 20, fit the sealing element 43 onto the outer periphery of the pole post 40, install the pole post 40 with the sealing element 43 fitted onto the pole post hole 31 of the top cover 30, and make the sealing element 43 located between the pole post 40 and the top cover 30, cover the outside of the mounting protrusion ring 50 with the insulating layer 53, and then fit the mounting protrusion ring 50 with the insulating layer 53 onto the outer periphery of the pole post 40 and weld it to the outside of the top cover 30 for mounting and fixing the pole post 40.

[0405] The top cover assembly 20 is connected to the electrode assembly 80. The top cover assembly 20 is placed on top of the housing 10 in a first placement state. The pole post 40 of the top cover assembly 20 is attached to and welded to the electrode body 832 in an unbent state.

[0406] The first insulating structure 60 is installed on the inside of the top cover 30. The top cover assembly 20 is flipped to the third placement state, which is between the first and second placement states. In the third placement state, the top cover assembly 20 has not yet covered the opening 11 of the housing 10. There is a certain gap between the top cover assembly 20 and the opening 11 of the housing 10. At this time, the third sub-support 65 and the fourth sub-support 66 of the first insulating bracket can be snapped together along the width direction of the top cover 30.

[0407] Assemble the top cover assembly 20 with the housing 10, and flip the top cover assembly 20 to the second placement state. The top cover assembly 20 covers the opening 11 of the housing 10. The electrode tab 83, which is in an unbent state, is bent under the flipping action of the top cover assembly 20 to form a bent electrode tab 83. The top cover 30 is then welded to the housing 10.

[0408] Reference Figures 16-18In some embodiments of this utility model, the battery cell 100 is a square battery, and the battery cell 100 includes a housing 10, a top cover assembly 20, an electrode assembly 80, and a second insulating structure 70. The housing 10 has an opening 11, which is sealed by the top cover assembly 20. The top cover assembly 20 and the housing 10 together define a receiving cavity 12. The top cover assembly 20 includes a top cover 30, terminals 40, a sealing element 43, a mounting ring 50, and a first insulating structure 60. The top cover 30 is rectangular and has two terminal holes 31, which are spaced apart along the length of the top cover 30. There are two terminals 40, one of which is a positive terminal 40 and the other is a negative terminal 40. The two terminals 40 are respectively installed in the two terminal holes 31. The sealing element 43 is made of insulating material and is arranged around the electrode post 40. The sealing element 43 is located between the electrode post 40 and the top cover 30. The top cover 30 is an integrally formed part. The electrode assembly 80 is located in the receiving cavity 12 and includes an electrode body 81 and an electrode tab 83 connected to the electrode body 81. The electrode tab 83 is connected to the electrode post 40.

[0409] A mounting ring 50 is connected to the outside of the top cover 30 and surrounds the pole post 40 for mounting and fixing the pole post 40. The mounting ring 50 is a metal part, and an insulating layer 53 is provided between the mounting ring 50 and the pole post 40. The mounting ring 50 includes a mounting part 51 and a limiting part 52. The limiting part 52 surrounds the outer periphery of the pole post 40, and the mounting part 51 is connected to the outer periphery of the limiting part 52 and connected to the top cover 30. The outer surface of the cover is provided with a mounting groove 32, which surrounds the pole post hole 31 and penetrates the inner peripheral wall of the pole post hole 31. The mounting part 51 is accommodated in the mounting groove 32.

[0410] The electrode post 40 includes an electrode post body 41 and an electrode post protrusion 42. The electrode post protrusion 42 is connected to the outer peripheral wall of the electrode post body 41 and is disposed around the electrode post body 41. The limiting part 52 includes a first limiting segment 521 and a second limiting segment 522. The first limiting segment 521 is connected between the mounting part 51 and the second limiting segment 522. The first limiting segment 521 surrounds the outer peripheral side of the electrode post protrusion 42. The second limiting segment 522 is located on the side of the electrode post protrusion 42 away from the electrode assembly 80. At least a portion of the sealing member 43 is located between the electrode post protrusion 42 and the top cover 30.

[0411] The first insulating structure 60 is fixed to the side of the top cover 30 facing the electrode assembly 80. The first insulating structure 60 is provided with a first clearance hole 61 for avoiding the electrode post 40. There are two first insulating structures 60, one of which has a first clearance hole 61 for avoiding the positive electrode post 40, and the other has a first clearance hole 61 for avoiding the negative electrode post 40. The two first insulating structures 60 are connected and integrally formed.

[0412] The second insulating structure 70 includes a support body 71 and two fixed support parts 72. The outer surface of the electrode body 81 is covered with an insulating protective film 82, and the support body 71 is connected and fixed to the insulating protective film 82. The support body 71 is provided with a second clearance hole 711 for avoiding the electrode tab 83. The fixed support parts 72 are connected to the inner peripheral wall of the second clearance hole 711. The two fixed support parts 72 are spaced apart along the width direction of the top cover 30, and a limiting opening 73 is defined between the two fixed support parts 72. The tab 83 includes a tab root 831 and a tab body 832. The tab root 831 connects the electrode body 81 and the tab body 832. The tab body 832 is bent and connected to the pole post 40. The connection position between the tab body 832 and the tab root 831 is located inside the limiting port 73. One fixed support part 72 is located on the side of the tab body 832 facing the electrode body 81 to support the tab body 832. The other fixed support part 72 covers the surface of the tab root 831 facing the top cover 30.

[0413] The support body 71 has a mating groove 701 on the side facing the top cover 30. The mating groove 701 surrounds the outer periphery of the second clearance hole 711, and the first insulating structure 60 is accommodated in the mating groove 701. The outer periphery of the first insulating structure 60 has a clearance slope 63. In the direction from the top cover 30 to the electrode assembly 80, the clearance slope 63 extends obliquely toward the central axis of the second clearance hole 711.

[0414] There are two second insulating structures 70. One of the second insulating structures 70 has a second clearance hole 711 to avoid the tab 83 of the positive electrode, and the other second insulating structure 70 has a second clearance hole 711 to avoid the tab 83 of the negative electrode. The two second insulating structures 70 are connected and integrally formed.

[0415] In this embodiment, reference is made to Figure 25 The assembly process of the battery cell 100 may include the following steps:

[0416] Assemble electrode assembly 80 by ultrasonically pre-welding multiple tabs on the wound electrode sheet to form tabs 83;

[0417] Insert the electrode assembly 80 into the housing, place the electrode body 81 of the electrode assembly 80 into the housing 10, and position the electrode tab 83 above the housing 10.

[0418] The second insulating structure 70 is moved from the free end of the electrode tab 83 along the electrode tab 83 into the housing 10, so that the electrode tab 83 passes through the second clearance hole 711 on the support body 71, and the support body 71 and the insulating protective film 82 outside the electrode body 81 are thermally fused together.

[0419] Assemble the top cover assembly 20, fit the sealing element 43 onto the outer periphery of the pole post 40, install the pole post 40 with the sealing element 43 fitted onto the pole post hole 31 of the top cover 30, and make the sealing element 43 located between the pole post 40 and the top cover 30, cover the outside of the mounting protrusion ring 50 with the insulating layer 53, then fit the mounting protrusion ring 50 with the insulating layer 53 onto the outer periphery of the pole post 40 and weld it to the outside of the top cover 30 for mounting and fixing the pole post 40, and fix the first insulating structure 60 to the inside of the top cover 30;

[0420] The top cover assembly 20 is connected to the electrode assembly 80. The top cover assembly 20 is placed on top of the housing 10 in a first placement state. The pole post 40 of the top cover assembly 20 is attached to and welded to the electrode body 832 in an unbent state.

[0421] Assemble the top cover assembly 20 with the housing 10, flip the top cover assembly 20 to a preset angle to the second placement state, and cover the top cover assembly 20 with the opening 11 of the housing 10. The electrode tab 83, which is in an unbent state, is bent under the flipping action of the top cover assembly 20 to form the electrode tab 83 in a bent state. Then weld the top cover 30 to the housing 10.

[0422] Reference Figure 22 In some embodiments of this utility model, the battery cell 100 is a square battery, and the battery cell 100 includes a housing 10, a top cover assembly 20, an electrode assembly 80, and a second insulating structure 70. The housing 10 has an opening 11, which is sealed by the top cover assembly 20. The top cover assembly 20 and the housing 10 together define a receiving cavity 12. The top cover assembly 20 includes a top cover 30, terminals 40, a sealing element 43, a mounting ring 50, and a first insulating structure 60. The top cover 30 is rectangular and has two terminal holes 31, which are spaced apart along the length of the top cover 30. There are two terminals 40, one of which is a positive terminal 40 and the other is a negative terminal 40. The two terminals 40 are respectively installed in the two terminal holes 31. The sealing element 43 is made of insulating material and is arranged around the electrode post 40. The sealing element 43 is located between the electrode post 40 and the top cover 30. The top cover 30 is an integrally formed part. The electrode assembly 80 is located in the receiving cavity 12 and includes an electrode body 81 and an electrode tab 83 connected to the electrode body 81. The electrode tab 83 is connected to the electrode post 40.

[0423] A mounting ring 50 is connected to the outside of the top cover 30 and surrounds the pole post 40 for mounting and fixing the pole post 40. The mounting ring 50 is a metal part, and an insulating layer 53 is provided between the mounting ring 50 and the pole post 40. The mounting ring 50 includes a mounting part 51 and a limiting part 52. The limiting part 52 surrounds the outer periphery of the pole post 40, and the mounting part 51 is connected to the outer periphery of the limiting part 52 and connected to the top cover 30. The outer surface of the cover is provided with a mounting groove 32, which surrounds the pole post hole 31 and penetrates the inner peripheral wall of the pole post hole 31. The mounting part 51 is accommodated in the mounting groove 32.

[0424] The electrode post 40 includes an electrode post body 41 and an electrode post protrusion 42. The electrode post protrusion 42 is connected to the outer peripheral wall of the electrode post body 41 and is disposed around the electrode post body 41. The limiting part 52 includes a first limiting segment 521 and a second limiting segment 522. The first limiting segment 521 is connected between the mounting part 51 and the second limiting segment 522. The first limiting segment 521 surrounds the outer peripheral side of the electrode post protrusion 42. The second limiting segment 522 is located on the side of the electrode post protrusion 42 away from the electrode assembly 80. At least a portion of the sealing member 43 is located between the electrode post protrusion 42 and the top cover 30.

[0425] The first insulating structure 60 is fixed to the side of the top cover 30 facing the electrode assembly 80. The first insulating structure 60 is provided with a first clearance hole 61 for avoiding the electrode post 40. There are two first insulating structures 60, one of which has a first clearance hole 61 for avoiding the positive electrode post 40, and the other has a first clearance hole 61 for avoiding the negative electrode post 40. The two first insulating structures 60 are connected and integrally formed.

[0426] The second insulation structure 70 includes a plurality of fixing support pieces 78, which are bonded and fixed at different positions on the surface of the tab 83. Some fixing support pieces 78 are bonded and fixed to the surface of the tab body portion 832, and some fixing support pieces 78 are bonded and fixed to the surface of the tab root portion 831.

[0427] In this embodiment, reference is made to Figure 26 The assembly process of the battery cell 100 may include the following steps:

[0428] Assemble electrode assembly 80 by ultrasonically pre-welding multiple tabs on the wound electrode sheet to form tabs 83;

[0429] Insert the electrode assembly 80 into the housing, place the electrode body 81 of the electrode assembly 80 into the housing 10, and position the electrode tab 83 above the housing 10.

[0430] Multiple fixing support pieces 78 of the second insulation structure 70 are bonded and fixed to different positions of the electrode tab 83;

[0431] Assemble the top cover assembly 20, fit the sealing element 43 onto the outer periphery of the pole post 40, install the pole post 40 with the sealing element 43 fitted onto the pole post hole 31 of the top cover 30, and make the sealing element 43 located between the pole post 40 and the top cover 30, cover the outside of the mounting protrusion ring 50 with the insulating layer 53, then fit the mounting protrusion ring 50 with the insulating layer 53 onto the outer periphery of the pole post 40 and weld it to the outside of the top cover 30 for mounting and fixing the pole post 40, and fix the first insulating structure 60 to the inside of the top cover 30;

[0432] The top cover assembly 20 is connected to the electrode assembly 80. The top cover assembly 20 is placed on top of the housing 10 in a first placement state. The pole post 40 of the top cover assembly 20 is attached to and welded to the electrode body 832 in an unbent state.

[0433] Assemble the top cover assembly 20 with the housing 10, flip the top cover assembly 20 to a preset angle to the second placement state, and cover the top cover assembly 20 with the opening 11 of the housing 10. The electrode tab 83, which is in an unbent state, is bent under the flipping action of the top cover assembly 20 to form the electrode tab 83 in a bent state. Then weld the top cover 30 to the housing 10.

[0434] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0435] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that, include: A housing having an opening; A top cover assembly, which covers the opening and together with the housing defines a receiving cavity, the top cover assembly includes a top cover, an electrode post and a sealing element, the top cover has an electrode post hole, the electrode post is installed in the electrode post hole, the sealing element is made of insulating material and is arranged around the electrode post, the sealing element is located between the electrode post and the top cover, and the top cover is an integrally formed part; An electrode assembly is disposed within the receiving cavity and includes an electrode body and a tab connected to the electrode body, the tab being connected to the electrode post.

2. The battery cell according to claim 1, characterized in that, The battery cell is a square battery, the top cover is rectangular, and the width of the top cover is W1, where W1 ≤ 40 mm.

3. The battery cell according to claim 2, characterized in that, The top cover is provided with two pole post holes, which are arranged at intervals along the length of the top cover, and two pole posts with opposite polarities are installed in each of the two pole post holes.

4. The battery cell according to claim 1, characterized in that, The top cover assembly includes a mounting ring connected to the outside of the top cover and surrounding the pole post for mounting and fixing the pole post.

5. The battery cell according to claim 4, characterized in that, The battery cell is a square battery, the top cover is rectangular, the width of the top cover is W1, and the dimension of the mounting protrusion in the width direction of the top cover is W2, where 2mm≤W1-W2≤6mm.

6. The battery cell according to claim 4, characterized in that, The mounting protrusion is a metal part, and an insulating layer is provided between the mounting protrusion and the pole post.

7. The battery cell according to claim 4, characterized in that, The mounting protrusion includes a mounting portion and a limiting portion. The limiting portion surrounds the outer periphery of the pole post, and the mounting portion is connected to the outer periphery of the limiting portion and is connected to the top cover.

8. The battery cell according to claim 7, characterized in that, The outer surface of the top cover is provided with a mounting groove, which surrounds the pole hole and penetrates the inner peripheral wall of the pole hole, and the mounting part is accommodated in the mounting groove.

9. The battery cell according to claim 7, characterized in that, The electrode post includes an electrode post body and an electrode post protrusion. The electrode post protrusion is connected to the outer peripheral wall of the electrode post body and surrounds the electrode post body. The limiting part includes a first limiting segment and a second limiting segment. The first limiting segment is connected between the mounting part and the second limiting segment and surrounds the outer peripheral side of the electrode post protrusion. The second limiting segment is located on the side of the electrode post protrusion away from the electrode assembly. At least a portion of the sealing member is located between the electrode post protrusion and the top cover.

10. The battery cell according to any one of claims 1-9, characterized in that, The electrode tab includes an electrode tab root and an electrode tab body. The electrode tab root connects the electrode body and the electrode tab body. The electrode tab body is bent and connected to the electrode post. The battery cell is a square battery. The top cover is rectangular. The dimension of the electrode tab root in the width direction of the top cover is W6, where W6 ≤ 32 mm.

11. The battery cell according to any one of claims 1-9, characterized in that, The top cover assembly includes a first insulating structure fixed to the side of the top cover facing the electrode assembly, and the first insulating structure is provided with a first clearance hole for avoiding the electrode post.

12. The battery cell according to claim 11, characterized in that, The first insulating structure is provided with a first positioning protrusion, and the top cover is provided with a first positioning hole, and the first positioning protrusion is inserted into the first positioning hole.

13. The battery cell according to claim 11, characterized in that, The top cover is provided with two pole hole, and two poles with opposite polarities are installed in the two pole hole respectively. There are two first insulation structures. The first clearance hole on one of the first insulation structures is used to avoid the pole of the positive electrode, and the first clearance hole on the other first insulation structure is used to avoid the pole of the negative electrode.

14. The battery cell according to claim 13, characterized in that, The two first insulating structures are connected and integrally formed; or, the two first insulating structures are spaced apart.

15. The battery cell according to any one of claims 1-9, characterized in that, It includes a second insulating structure, which is fixed to the electrode assembly or housing, and at least a portion of the second insulating structure is in contact with or connected to the tab for fixing and supporting the tab.

16. The battery cell according to claim 15, characterized in that, The second insulation structure includes a support body and at least one fixed support portion. The support body is fixed to the electrode body or the housing. The support body is provided with a second clearance hole for avoiding the electrode tab. The fixed support portion is connected to the inner peripheral wall of the second clearance hole. The fixed support portion contacts the electrode tab to fix and support the electrode tab.

17. The battery cell according to claim 16, characterized in that, The electrode tab includes an electrode tab root and an electrode tab body. The electrode tab root connects the electrode body and the electrode tab body. The electrode tab body is bent and connected to the electrode post. At least a portion of the electrode tab body is located within the second clearance hole.

18. The battery cell according to claim 17, characterized in that, At least a portion of the fixed support portion is located on the side of the electrode body facing the electrode body to support the electrode body.

19. The battery cell according to claim 17, characterized in that, At least a portion of the fixed support covers the surface of the base of the pole ear facing the top cover.

20. The battery cell according to claim 16, characterized in that, The second clearance hole is provided with a plurality of fixed support parts, which are arranged at intervals along the circumference of the second clearance hole and distributed at different positions of the electrode tab.

21. The battery cell according to claim 20, characterized in that, The battery cell is a square battery, the top cover is rectangular, and the plurality of fixed supports are divided into two groups of fixed support parts. Each group of fixed support parts includes at least one fixed support part. The two groups of fixed support parts are arranged at intervals along the width direction of the top cover to form a limiting opening for the tab to pass through between the two groups of fixed support parts.

22. The battery cell according to claim 21, characterized in that, The electrode tab includes an electrode tab root and an electrode tab body. The electrode tab root connects the electrode body and the electrode tab body. The electrode tab body is bent and connected to the electrode post. The connection position between the electrode tab body and the electrode tab root is located within the limiting opening. One set of the fixed support parts is located on the side of the electrode tab body facing the electrode body to support the electrode tab body. Another set of the fixed support parts covers the surface of the electrode tab root facing the top cover.

23. The battery cell according to claim 21, characterized in that, The dimension of the limiting opening in the width direction of the top cover is W5, where W5 ≤ 6mm.

24. The battery cell according to claim 16, characterized in that, The outer surface of the electrode body is covered with an insulating protective film, and the support body is connected and fixed to the insulating protective film.

25. The battery cell according to claim 24, characterized in that, The support body is thermally fused to the insulating protective film.

26. The battery cell according to claim 16, characterized in that, The top cover assembly includes a first insulating structure fixed to the side of the top cover facing the electrode assembly. The first insulating structure has a first clearance hole for avoiding the electrode post. The first insulating structure has a dimension of W3 in the width direction of the top cover, and the second clearance hole has a dimension of W4 in the width direction of the top cover, where W3 ≥ W4.

27. The battery cell according to claim 16, characterized in that, The top cover assembly includes a first insulating structure, which is fixed to the side of the top cover facing the electrode assembly. The first insulating structure has a first clearance hole for avoiding the electrode post. The side of the bracket body facing the top cover has a mating groove, which surrounds the outer periphery of the second clearance hole. The first insulating structure is accommodated in the mating groove.

28. The battery cell according to claim 27, characterized in that, The dimension of the mating groove in the thickness direction of the top cover is h1, and the dimension of the first insulating structure in the thickness direction of the top cover is h2, where h1 ≥ h2.

29. The battery cell according to claim 27, characterized in that, The dimension of the mating groove in the thickness direction of the top cover is h1, h1≥0.5mm; and / or, the dimension of the first insulating structure in the thickness direction of the top cover is h2, h2≥0.5mm.

30. The battery cell according to claim 27, characterized in that, The outer peripheral sidewall of the first insulating structure is provided with a clearance slope, which extends obliquely toward the central axis of the second clearance hole in the direction from the top cover to the electrode assembly.

31. The battery cell according to claim 27, characterized in that, The mating groove extends through the support body along the width direction of the top cover.

32. The battery cell according to claim 16, characterized in that, The main body of the bracket is in contact with or connected to the top cover assembly.

33. The battery cell according to claim 32, characterized in that, The top cover assembly includes a first insulating structure, which is fixed to the side of the top cover facing the electrode assembly. The first insulating structure has a first clearance hole for avoiding the electrode post, and the bracket body is connected to the first insulating structure.

34. The battery cell according to claim 33, characterized in that, The main body of the bracket is snapped into the first insulating structure.

35. The battery cell according to claim 34, characterized in that, At least a portion of the first insulating structure is stacked with the support body in the thickness direction of the top cover, and the support body and the first insulating structure are engaged along the thickness direction of the top cover.

36. The battery cell according to claim 35, characterized in that, One of the bracket body and the first insulating structure is provided with a second positioning protrusion and the other is provided with a second positioning hole. The second positioning protrusion is inserted into the second positioning hole along the thickness direction of the top cover.

37. The battery cell according to claim 16, characterized in that, The top cover is provided with two pole hole, and two poles with opposite polarities are installed in the two pole hole respectively. There are two second insulation structures. The second clearance hole on one of the second insulation structures is used to avoid the positive pole tab, and the second clearance hole on the other second insulation structure is used to avoid the negative pole tab.

38. The battery cell according to claim 37, characterized in that, The two second insulating structures are connected and integrally formed; or the two second insulating structures are spaced apart.

39. The battery cell according to claim 37, characterized in that, The battery cell is a square battery, the top cover is rectangular, the two terminal holes are arranged at intervals along the length of the top cover, each second insulation structure includes a first sub-support and a second sub-support arranged and connected along the width of the top cover, the first sub-support and the second sub-support of each second insulation structure together define the second clearance hole, and the first sub-support and the second sub-support are both independently molded parts.

40. The battery cell according to claim 39, characterized in that, The first sub-bracket and the second sub-bracket are snap-fitted together.

41. The battery cell according to claim 39, characterized in that, The first sub-supports of the two second insulating structures are integrally formed, and the second sub-supports of the two second insulating structures are integrally formed.

42. The battery cell according to claim 16, characterized in that, The battery cell is a square battery, the top cover is rectangular, and the width of the top cover is W1, 30mm≤W1≤38mm.

43. The battery cell according to claim 15, characterized in that, The second insulation structure includes at least one fixed support piece, which is bonded and fixed to the electrode tab.

44. The battery cell according to claim 43, characterized in that, There are multiple fixed support pieces, which are bonded and fixed at different positions on the surface of the electrode tab.

45. The battery cell according to claim 43, characterized in that, The electrode tab includes an electrode tab root and an electrode tab body. The electrode tab root connects the electrode body and the electrode tab body. The electrode tab body is bent and connected to the electrode post. At least a portion of the fixing support piece is bonded and fixed to the surface of the electrode tab body, and at least a portion of the fixing support piece is bonded and fixed to the surface of the electrode tab root.

46. ​​The battery cell according to claim 43, characterized in that, The battery cell is a square battery, the top cover is rectangular, and the width of the top cover is W1, where W1 ≤ 28 mm.

47. A battery device, characterized in that, include: Box; The battery cell according to any one of claims 1-46 is disposed in the housing.

48. An electrical appliance, characterized in that, Includes the battery device as described in claim 47.

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