Battery and battery pack

Abstract

The application discloses a battery and a battery pack, wherein the battery comprises a shell, a top cover assembly, a battery cell and a tab limiting piece, the top cover assembly comprises a top cover sheet and a pole, the top cover sheet is provided with a pole mounting hole, the pole is arranged in the pole mounting hole, and the top cover sheet is connected to one end of an opening of the shell; the battery cell comprises a body and a tab which are connected to each other, and the battery cell is accommodated in the interior of the shell; the tab limiting piece is located between the body and the top cover assembly, the tab limiting piece is provided with a tab channel, the tab is arranged in the tab channel, the tab channel is used for limiting the tab, one end of the tab away from the body is exposed from the tab limiting piece and connected to the pole, the tab limiting piece is not easy to fall off during use of the battery, and the surface of the tab can be effectively insulated; and during production and use of the battery, the tab limiting piece can effectively protect the tab of the battery cell, reduces the occurrence of phenomena such as tearing of the tab, insertion of a diaphragm into the tab and the like, and thus the safety and reliability of the battery are improved.

Description

Technical Field

[0001] This application relates to the field of power battery technology, and in particular to a battery and battery pack. Background Technology

[0002] In related technologies, to prevent short circuits caused by contact between the battery cell's tabs and the casing or other structures, adhesive tape can be attached to the surface of the tabs for insulation. However, on the one hand, the adhesive tape is prone to losing its stickiness in the electrolyte environment and may fall off during long-term use. On the other hand, during battery production and use, due to insufficient strength and rigidity of the tabs, phenomena such as tab tearing and diaphragm insertion into the tabs may occur, which may lead to safety issues and lower battery reliability. Summary of the Invention

[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a battery that can stably insulate and protect the tabs of the battery cell, thereby improving the safety and reliability of the battery.

[0004] This application also proposes a battery pack including the aforementioned batteries.

[0005] The battery provided in the first aspect of this application includes a housing, a top cover assembly, a battery cell, and a tab limiting member. One end of the housing is open. The top cover assembly includes a top cover plate and a terminal post. The top cover plate has a terminal post mounting hole, and the terminal post passes through the terminal post mounting hole. The top cover plate is connected to one end of the opening of the housing. The battery cell includes a body and a tab connected to each other, and the battery cell is housed inside the housing. The tab limiting member is located between the body and the top cover assembly. The tab limiting member has a tab channel, and the tab passes through the tab channel. The tab channel is used to limit the tab. The end of the tab away from the body protrudes from the tab limiting member and is connected to the terminal post.

[0006] The battery provided in the first aspect of this application has at least the following beneficial effects: a tab limiting member is provided between the body of the battery cell and the top cover assembly, and the tab of the battery cell passes through the tab channel in the tab limiting member, thereby achieving insulation and limiting. On the one hand, the tab limiting member is not easy to fall off during battery use and can effectively insulate the surface of the tab; on the other hand, during the battery production process and during use, the tab limiting member can provide effective protection for the tab of the battery cell, reduce the occurrence of phenomena such as tab tearing and diaphragm insertion into the tab, thereby improving the safety and reliability of the battery.

[0007] In some embodiments of this application, the tab limiting member has a first side and a second side opposite to each other. The first side and the second side are respectively disposed on both sides of the tab limiting member along the width direction of the body. In the direction away from the body, the first side gradually approaches the second side.

[0008] In some embodiments of this application, the first side is arc-shaped and recessed towards the second side.

[0009] In some embodiments of this application, the electrode channel includes a first cavity and a second cavity that are interconnected. The electrode includes a folded portion and a protruding portion that are interconnected. The folded portion extends in the width direction of the body, and the protruding portion extends toward the electrode post. The folded portion is housed inside the first cavity and connected to the body. The protruding portion passes through the second cavity, and one end of the protruding portion away from the folded portion protrudes from the electrode limiting member and is connected to the electrode post. In the width direction of the body, the width of the first cavity at the end closer to the body is greater than the width of the second cavity.

[0010] In some embodiments of this application, the width of the first cavity gradually decreases along the width direction of the body in the direction away from the body.

[0011] In some embodiments of this application, the length of the second cavity along the length direction of the body is greater than the width of the protrusion along the length direction of the body.

[0012] In some embodiments of this application, the width of the second cavity along the width direction of the body is equal to the thickness of the protrusion along the width direction of the body.

[0013] In some embodiments of this application, the width of the second cavity remains constant along the width direction of the body in the direction away from the body.

[0014] In some embodiments of this application, the width of the end of the tab limiting member near the body is equal to the width of the body.

[0015] The battery pack provided in the second aspect of this application includes a housing and a battery provided in any of the above embodiments, wherein the battery is housed inside the housing.

[0016] The battery pack provided in the second aspect of this application has at least the following beneficial effects: In the battery pack, a tab limiting member is provided between the body of the battery cell and the top cover assembly. The tab of the battery cell passes through the tab channel in the tab limiting member, thereby achieving insulation and limiting. On the one hand, the tab limiting member is not easy to fall off during battery use and can effectively insulate the surface of the tab. On the other hand, during the battery production process and during use, the tab limiting member can provide effective protection for the tab of the battery cell, reduce the occurrence of phenomena such as tab tearing and diaphragm insertion into the tab, and improve the safety and reliability of the battery, thereby improving the safety and reliability of the battery pack.

[0017] Additional aspects and advantages of this application 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 this application. Attached Figure Description

[0018] The present application will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0019] Figure 1 Three-dimensional schematic diagrams of batteries provided for some embodiments of this application;

[0020] Figure 2 Cross-sectional view of the tab retainer of a battery according to some embodiments provided in this application;

[0021] Figure 3 for Figure 2 The diagram shows a cross-sectional view of the electrode retainer in conjunction with the battery cell.

[0022] Figure 4 An exploded view of the top cover assembly of a battery according to some embodiments provided in this application;

[0023] Figure 5 for Figure 4 A cross-sectional view of the top cover assembly shown;

[0024] Figure 6 for Figure 5 Enlarged view of point A in the middle;

[0025] Figure 7 A schematic diagram of the top cover assembly and protective film of a battery according to some embodiments provided in this application;

[0026] Figure 8 A perspective view of the explosion-proof valve of a battery according to some embodiments provided in this application;

[0027] Figure 9 for Figure 8 The cross-sectional view of the explosion-proof valve shown;

[0028] Figure 10A cross-sectional view of the connection between the sealing pin and the top cover plate of a battery according to some embodiments provided in this application;

[0029] Figure 11 for Figure 10 A cross-sectional view of the sealing pin in the middle;

[0030] Figure 12 This is a cross-sectional view of the sealing pin in some other embodiments.

[0031] Figure label:

[0032] Housing 100, top cover assembly 200, top cover plate 210, pole mounting hole 211, explosion-proof valve mounting hole 212, injection hole 213, pole 220, lead-out part 221, connecting part 222, spacer 230, support part 231, surrounding part 232, through hole 2321, sealing ring 240, upper plastic 250, insulating ring 260, lower plastic 270, second positioning structure 271, explosion-proof valve 280, mounting part 281 First reinforcing part 282, bending area 2821, deformable part 283, sealing nail 290, groove 291, second reinforcing part 292, battery cell 300, body 310, electrode tab 320, folding part 321, protruding part 322, electrode tab limiting member 400, electrode tab channel 410, first cavity 411, second cavity 412, first side 420, second side 430, protective film 500, first positioning structure 510. Detailed Implementation

[0033] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0034] In the description of this application, it should be understood that the orientation descriptions, such as up, down, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0035] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0036] In the description of this application, the reference to terms such as "one embodiment," "some embodiments," etc., means 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 this application. 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.

[0037] The battery provided in the first aspect of this application includes a housing 100, a top cover assembly 200, a battery cell 300, and a tab limiting member 400. One end of the housing 100 is open. The top cover assembly 200 includes a top cover plate 210 and a terminal post 220. The top cover plate 210 has a terminal post mounting hole 211, and the terminal post 220 passes through the terminal post mounting hole 211. The top cover plate 210 is connected to one end of the opening of the housing 100. The battery cell 300 includes a body 310 and a tab 320 connected to each other. The battery cell 300 is housed inside the housing 100. The tab limiting member 400 is located between the body 310 and the top cover assembly 200. The tab limiting member 400 has a tab channel 410, and the tab 320 passes through the tab channel 410. The tab channel 410 is used to limit the tab 320. The end of the tab 320 away from the body 310 is exposed in the tab limiting member 400 and connected to the terminal post 220.

[0038] For example, such as Figures 1 to 3As shown, the battery includes a housing 100, a top cover assembly 200, a battery cell 300, and a tab limiting member 400. One end of the housing 100 is open. The top cover assembly 200 includes a top cover plate 210 and a terminal post 220. The top cover plate 210 has a terminal post mounting hole 211, and the terminal post 220 passes through the terminal post mounting hole 211. The top cover plate 210 is connected to one end of the opening of the housing 100. The battery cell 300 includes a body 310 and a tab 320 connected to each other. The battery cell 300 is housed inside the housing 100. The tab limiting member 400 is located between the body 310 and the top cover assembly 200. The tab limiting member 400 has a tab channel 410, and the tab 320 passes through the tab channel 410. The tab channel 410 is used to limit the tab 320. The end of the tab 320 away from the body 310 is exposed in the tab limiting member 400 and connected to the terminal post 220. A tab limiting member 400 is provided between the body 310 and the top cover assembly 200 of the battery cell 300. The tabs 320 of the battery cell 300 pass through the tab channel 410 within the tab limiting member 400, thereby achieving insulation and limiting. On the one hand, the tab limiting member 400 is not easy to fall off during battery use, and can effectively insulate the surface of the tabs 320, preventing the tabs 320 between the body 310 and the terminal post 220 from contacting the casing 100 and other structures, which could lead to a short circuit in the battery. On the other hand, during the battery production process and during use, the tab limiting member 400 can provide effective protection for the tabs 320 of the battery cell 300, reducing the occurrence of phenomena such as tab tearing and diaphragm insertion into the tabs 320, thereby improving the safety and reliability of the battery.

[0039] Understandably, the tab limiter 400 can be made of a rigid material that can withstand the electrolyte environment.

[0040] It should be noted that the electrode channel 410 includes a first cavity 411 and a second cavity 412 that are interconnected. The electrode 320 includes a folded portion 321 and a protruding portion 322 that are interconnected. The folded portion 321 extends in the width direction of the body 310, and the protruding portion 322 extends toward the electrode post 220. The folded portion 321 is housed inside the first cavity 411 and is connected to the body 310. The protruding portion 322 passes through the second cavity 412. The end of the protruding portion 322 away from the folded portion 321 is exposed at the electrode limiting member 400 and connected to the electrode post 220. In the width direction of the body 310, the width d1 of the first cavity 411 near the body 310 is greater than the width d2 of the second cavity.

[0041] For example, such as Figure 3As shown, to reduce the space occupied by the tab 320, a section of the tab 320 near the body 310 is folded. The folded portion of the tab 320 is described as the folded part 321, and the undisturbed portion as the protrusion 322. The folded part 321 extends in the width direction of the body 310, and the protrusion 322 extends towards the pole post 220. The folded part 321 is located on the upper surface of the body 310. The body 310, the folded part 321, and the protrusion 322 are connected sequentially from bottom to top. (Refer to...) Figure 2 To accommodate the tab 320 with the above structure, the tab channel 410 includes a first cavity 411 and a second cavity 412 that are interconnected. The folding part 321 is housed inside the first cavity 411 and connected to the body 310. The protruding part 322 passes through the second cavity 412. The end of the protruding part 322 away from the folding part 321 is exposed at the tab limiting member 400 and connected to the pole post 220. In the width direction of the body 310, the width d1 of the first cavity 411 near the body 310 is greater than the width d2 of the second cavity, so that the tab channel 410 can completely accommodate the entire tab 320.

[0042] It should be noted that, in the direction away from the body 310, the width of the first cavity 411 gradually decreases along the width direction of the body 310.

[0043] For example, such as Figure 2 As shown, in the direction away from the body 310, i.e., from bottom to top, the width of the first cavity 411 along the width direction of the body 310 gradually decreases from d1 to d2. (Refer to...) Figure 3 The first cavity 411 can adapt to the shape of the folding part 321, thereby ensuring the limiting effect on the folding part 321.

[0044] It should be noted that the electrode tab limiting member 400 has a first side surface 420 and a second side surface 430, which are respectively disposed on both sides of the electrode tab limiting member 400 along the width direction of the body 310. In the direction away from the body 310, the first side surface 420 gradually approaches the second side surface 430.

[0045] For example, such as Figure 2As shown, the tab limiting member 400 has a first side surface 420 and a second side surface 430 facing each other. The first side surface 420 and the second side surface 430 are respectively disposed on both sides of the tab limiting member 400 along the width direction of the body 310. In the direction away from the body 310, the first side surface 420 gradually moves closer to the second side surface 430, thereby realizing that in the direction away from the body 310, that is, from bottom to top, the width of the tab limiting member 400 along the width direction of the body 310 gradually decreases from D1 to D2. This reduces the volume of the tab limiting member 400, saving materials and space. Furthermore, in the case where the tab channel 410 includes a first cavity 411 and a second cavity 412 that are interconnected, and the width d1 of the end of the first cavity 411 near the body 310 is greater than the width d2 of the second cavity 412, the first side 420 is arranged to gradually approach the second side 430. This can adapt to the shape of the tab channel 410 and avoid excessive differences in wall thickness among different parts of the tab limiting member 400, so as to facilitate molding by injection molding or other methods.

[0046] It should be noted that the first side 420 can be set to be arc-shaped, and the first side 420 is concave towards the second side 430.

[0047] For example, such as Figure 2 As shown, the first side 420 is arc-shaped and recessed towards the second side 430, which can further reduce the volume of the tab limiting member 400. Furthermore, when the tab channel 410 includes a first cavity 411 and a second cavity 412 that are interconnected, and the width d1 of the end of the first cavity 411 near the body 310 is greater than the width d2 of the second cavity 412, setting the first side 420 to be arc-shaped and recessed towards the second side 430 can both adapt to the shape of the tab channel 410 and make the width change of the tab limiting member 400 smooth, thereby reducing stress concentration on the outer surface of the tab limiting member 400.

[0048] Understandably, there are no restrictions on the dimensions such as the 420° curvature of the first side, and they can be set according to actual needs.

[0049] It should be noted that the length l of the second cavity 412 along the length direction of the body 310 is greater than the width L of the protrusion 322 along the length direction of the body 310.

[0050] For example, such as Figure 3As shown, the length l of the second cavity 412 along the length direction of the body 310 is greater than the width L of the protrusion 322 along the length direction of the body 310. On the one hand, when the width L of the protrusion 322 of different tabs 320 has a certain manufacturing tolerance, the length l of the second cavity 412 is slightly greater than the width L of the protrusion 322, which can accommodate a certain tolerance of the width L of the protrusion 322 and ensure that the second cavity 412 can accommodate the protrusion 322. On the other hand, setting the length l of the second cavity 412 to be slightly greater than the width L of the protrusion 322 can reduce the assembly difficulty and make it easier for the protrusion 322 to be installed into the second cavity 412.

[0051] It should be noted that the width d2 of the second cavity 412 along the width direction of the body 310 is equal to the thickness d of the protrusion 322 along the width direction of the body 310.

[0052] For example, such as Figure 2 and Figure 3 As shown, the width d2 of the second cavity 412 along the width direction of the body 310 is equal to the thickness d of the protrusion 322 along the width direction of the body 310. The second cavity 412 can play a relatively stable limiting role for the protrusion 322. In addition, since the width d2 of the second cavity 412 is equal to the thickness d of the protrusion 322, the inner wall of the second cavity 412 can play a shaping role for the protrusion 322 during the process of the protrusion 322 being inserted into the second cavity 412, making the protrusion 322 flat.

[0053] It should be noted that, in the direction away from the main body 310, the width d2 of the second cavity 412 along the width direction of the main body 310 remains unchanged.

[0054] For example, such as Figure 2 As shown, in the direction away from the body 310, the width d2 of the second cavity 412 along the width direction of the body 310 remains unchanged, referring to... Figure 3 The protrusion 322 is a thin sheet with a constant thickness. The width d2 of the second cavity 412 remains constant, which can adapt to the shape of the protrusion 322, thereby ensuring the limiting effect of the protrusion 322.

[0055] Understandably, the width d2 of the second cavity 412 can be set to be equal to or slightly greater than the thickness of the protrusion 322.

[0056] It should be noted that the width D1 of the end of the tab limiting member 400 near the body 310 is equal to the width D of the body 310.

[0057] For example, such as Figure 2 and Figure 3As shown, the width D1 of the end of the tab limiting member 400 near the body 310 is equal to the width D of the body 310, which facilitates installation and positioning and can improve installation efficiency.

[0058] Understandably, the contact surface between the tab limiter 400 and the body 310 can be set as a plane so that the tab limiter 400 can be stably placed on the upper end of the body 310.

[0059] It should be noted that the top cover assembly 200 also includes a spacer 230, a sealing ring 240, and an upper plastic 250. The spacer 230 is annular and is connected to the edge of the pole mounting hole 211 in the circumferential direction. The spacer 230 includes a support portion 231 and a surrounding portion 232. The support portion 231 extends radially into the pole mounting hole 211. The surrounding portion 232 is connected to the outer edge of the support portion 231 and protrudes relative to the top cover plate 210. The pole 220 passes through the surrounding portion 232 into the pole mounting hole 211. The sealing ring 240 is located between the pole 220 and the support portion 231. The upper plastic 250 covers the surrounding portion 232 and is connected to the pole 220 and the top cover plate 210.

[0060] For example, such as Figures 4 to 6 As shown, the top cover assembly 200 also includes a spacer 230, a sealing ring 240, and an upper plastic 250. The spacer 230 is annular and is connected to the edge of the pole mounting hole 211 in the circumferential direction. The spacer 230 includes a support portion 231 and a surrounding portion 232. The support portion 231 extends radially into the pole mounting hole 211, and the surrounding portion 232 is connected to the outer edge of the support portion 231. The surrounding portion 232 protrudes relative to the top cover plate 210. The pole 220 passes through the surrounding portion 232 into the pole mounting hole 211. The support portion 231 can provide stable support for the pole 220. The sealing ring 240 is located between the pole 220 and the support portion 231 and can achieve insulation and sealing between the pole 220 and the support portion 231. The upper plastic 250 covers the surrounding portion 232 and is connected to the pole 220 and the top cover plate 210. When a large amount of heat is unexpectedly generated inside the battery, the upper plastic 250 softens due to heat, but the support part 231 can always provide support for the terminal post 220, ensuring that the terminal post 220 and the top cover plate 210 are always relatively fixed, avoiding thermal runaway caused by the terminal post 220 sinking into the interior of the housing 100 or even falling off, thus improving the safety and reliability of the battery.

[0061] Understandably, the spacer 230 can be welded to the edge of the pole mounting hole 211 in the circumferential direction.

[0062] It should be noted that the pole post 220 includes an outlet portion 221 and a connecting portion 222 that are connected to each other. The outlet portion 221 protrudes from the top cover plate 210. The connecting portion 222 is located on the side of the sealing ring 240 away from the support portion 231. The diameter of the connecting portion 222 is larger than the diameter of the outlet portion 221. The end of the surrounding portion 232 away from the support portion 231 is bent into the pole post mounting hole 211. The opening of the end of the surrounding portion 232 away from the support portion 231 is smaller than that of the connecting portion 222. There is a gap between the surrounding portion 232 and the outlet portion 221.

[0063] For example, such as Figures 4 to 6 As shown, the pole post 220 includes an outlet portion 221 and a connecting portion 222 connected to each other. The outlet portion 221 protrudes relative to the top cover plate 210. The connecting portion 222 is located on the side of the sealing ring 240 away from the support portion 231. The diameter of the connecting portion 222 is larger than the diameter of the outlet portion 221. The end of the surrounding portion 232 away from the support portion 231 is bent into the pole post mounting hole 211. The opening of the end of the surrounding portion 232 away from the support portion 231 is smaller than that of the connecting portion 222, which can limit the connecting portion 222 in the axial direction of the pole post 220, thereby initially fixing the pole post 220. There is a gap between the surrounding portion 232 and the outlet portion 221, which can prevent the pole post 220 from short-circuiting with the top cover plate 210. During installation, first place the pole post 220 on the support part 231, then bend the end of the circumferential part 232 away from the support part 231 toward the inside of the pole post mounting hole 211 to achieve initial fixation of the pole post 220. Then install the plastic 250, which is connected to the pole post 220 and the top cover plate 210 to complete the fixation of the pole post 220.

[0064] It should be noted that the top cover assembly 200 also includes an insulating ring 260, which is sleeved on the pole post 220. The end of the circumferential portion 232 away from the support portion 231 is bent into the pole post mounting hole 211 and abuts against the insulating ring 260.

[0065] For example, such as Figures 4 to 6 As shown, the top cover assembly 200 also includes an insulating ring 260, which is sleeved on the pole post 220. The end of the surrounding portion 232 away from the support portion 231 is bent into the pole post mounting hole 211 and abuts against the insulating ring 260. This ensures insulation between the pole post 220 and the spacer ring 230 while firmly fixing the pole post 220, thereby reducing assembly difficulty. During installation, the pole post 220 with the insulating ring 260 sleeved is first placed on the support portion 231. Then, the end of the surrounding portion 232 away from the support portion 231 is bent into the pole post mounting hole 211, so that the end of the surrounding portion 232 away from the support portion 231 abuts against the insulating ring 260. Then, the plastic 250 is installed, which connects the pole post 220 and the top cover plate 210, thus completing the fixing of the pole post 220.

[0066] It should be noted that the upper plastic 250 is formed by injection molding. The upper plastic 250 can be injection molded after the top cover plate 210, spacer ring 230 and pole post 220 are installed, so as to ensure that the upper plastic 250 covers the surrounding part 232 and connects the top cover plate 210 and pole post 220, effectively fixing the pole post 220.

[0067] It should be noted that the surrounding part 232 has multiple through holes 2321.

[0068] For example, such as Figures 4 to 6 As shown, the surrounding part 232 has multiple through holes 2321. When the upper plastic 250 is injection molded, the through holes 2321 can ensure smooth injection of the plastic. Part of the injection can be formed within the through holes 2321, which can improve the reliability of the upper plastic 250 covering the surrounding part 232 and connecting the top cover 210 and the pole post 220.

[0069] It is understandable that the number, size, and location of the through holes 2321 are not limited and can be set according to actual needs. Multiple through holes 2321 can be evenly distributed around the circumference of the surrounding part 232 to ensure the consistency of the amount of glue injected during injection molding.

[0070] It should be noted that the battery also includes a protective film 500, which has a first positioning structure 510, and the top cover assembly 200 has a second positioning structure 271. The protective film 500 covers the body 310 and is positioned by the first positioning structure 510 and the second positioning structure 271.

[0071] For example, such as Figure 7 As shown, the battery also includes a protective film 500, which has a first positioning structure 510 and a top cover assembly 200 has a second positioning structure 271. The protective film 500 covers the body 310 and is positioned by the first positioning structure 510 and the second positioning structure 271, thereby preventing the protective film 500 from shifting position during the production process, causing the protective film 500 to exceed the cover plate and resulting in quality problems in subsequent welding processes.

[0072] It is understandable that the positioning of the protective film 500 by the first positioning structure 510 and the second positioning structure 271 can include the circumferential positioning of the protective film 500 and the top cover assembly 200, as well as the axial positioning of the protective film 500 and the top cover assembly 200 along the pole post 220. The first positioning structure 510 and the second positioning structure 271 can be configured as structures that can abut against each other, having only a positioning function. After the protective film 500 is positioned, its upper end can be fixed to the top cover assembly 200 by means of heat fusion, thus achieving the fixation of the protective film 500. Alternatively, the first positioning structure 510 and the second positioning structure 271 can be configured as structures that can connect to each other, such as snap-fit ​​structures, simultaneously serving both positioning and fixing functions.

[0073] It should be noted that the first positioning structure 510 is located on the edge of the protective film 500 near the top cover assembly 200. The first positioning structure 510 is recessed from the edge of the protective film 500 near the top cover assembly 200 in a direction away from the top cover assembly 200. The second positioning structure 271 is located in the circumferential direction of the top cover assembly 200. The second positioning structure 271 protrudes outward from the top cover assembly 200 and can be embedded in the first positioning structure 510.

[0074] For example, such as Figure 7 As shown, the first positioning structure 510 is located on the edge of the protective film 500 near the top cover assembly 200. The first positioning structure 510 is recessed from the edge of the protective film 500 near the top cover assembly 200 in a direction away from the top cover assembly 200, forming a notch. The second positioning structure 271 is located circumferentially on the top cover assembly 200. The second positioning structure 271 protrudes outward from the top cover assembly 200 and can be embedded into the first positioning structure 510. The protective film 500 is usually a thin film structure. Setting the first positioning structure 510 as a notch facilitates processing. Furthermore, the notch-shaped first positioning structure 510 and the protruding second positioning structure 271 can effectively achieve circumferential positioning of the protective film 500 and the top cover assembly 200, as well as axial positioning along the pole post 220.

[0075] Understandably, multiple second positioning structures 271 can be provided circumferentially on the top cover assembly 200, and the same number of first positioning structures 510 can be provided circumferentially on the end of the protective film 500 near the top cover assembly 200 to enhance the positioning effect. The second positioning structures 271 can be provided on the lower plastic 270 of the top cover assembly 200. The lower plastic 270 is injection molded to place the raised second positioning structures 271 on the lower plastic 270, which facilitates the processing of the second positioning structures 271.

[0076] It should be noted that the top cover plate 210 has an explosion-proof valve mounting hole 212, and the top cover assembly 200 also includes an explosion-proof valve 280. The explosion-proof valve 280 includes a mounting part 281, a first reinforcing part 282 and a deformable part 283. The first reinforcing part 282 surrounds the deformable part 283, the mounting part 281 surrounds the first reinforcing part 282, and the mounting part 281 is connected to the edge of the explosion-proof valve mounting hole 212.

[0077] For example, such as Figure 4 As shown, the top cover plate 210 has an explosion-proof valve mounting hole 212, and the top cover assembly 200 also includes an explosion-proof valve 280, as shown in the figure. Figure 8 and Figure 9 The explosion-proof valve 280 includes a mounting portion 281, a first reinforcing portion 282, and a deformable portion 283. The first reinforcing portion 282 surrounds the deformable portion 283, and the mounting portion 281 surrounds the first reinforcing portion 282. The mounting portion 281 is connected to the edge of the explosion-proof valve mounting hole 212. When the internal pressure of the battery unexpectedly rises to a set pressure value, the explosion-proof valve 280 can burst open and release pressure, reducing the risk of the battery exploding. As the internal pressure of the battery gradually increases, the deformable portion 283 of the explosion-proof valve 280 protrudes outward. The first reinforcing portion 282 can reduce the amount of deformation transmitted from the deformable portion 283 to the mounting portion 281, reducing the impact of the deformation at the connection between the mounting portion 281 and the top cover plate 210 on the air pressure value that the deformable portion 283 can withstand, ensuring that the deformable portion 283 can burst open normally after reaching the set pressure value.

[0078] It is understandable that the wall thickness of the mounting part 281 can be greater than the wall thickness of the deformable part 283, so that the mounting part 281 has stronger resistance to deformation.

[0079] It should be noted that the first reinforcing part 282 includes multiple annular bending areas 2821, which are connected in sequence along the radial direction of the explosion-proof valve mounting hole 212 to form a wave structure.

[0080] For example, such as Figure 9 As shown, the first reinforcing part 282 includes multiple annular bending areas 2821. Along the radial direction of the explosion-proof valve mounting hole 212, the multiple bending areas 2821 are connected in sequence to form a wave structure. The first reinforcing part 282 of the wave structure can further reduce the amount of deformation transmitted from the deformable part 283 to the mounting part 281, reduce the influence of the deformation at the connection between the mounting part 281 and the top cover plate 210 on the air pressure value that the deformable part 283 can withstand, and ensure that the deformable part 283 can burst normally after withstanding the set pressure value.

[0081] It should be noted that the top cover plate 210 has an injection hole 213, and the top cover assembly 200 also includes a sealing pin 290. The sealing pin 290 is connected to the top cover plate 210 to close the injection hole 213, and the outer end face of the sealing pin 290 has a groove 291.

[0082] For example, such as Figures 10 to 11 As shown, the top cover plate 210 has an injection hole 213, through which electrolyte can be injected into the interior of the housing 100. The top cover assembly 200 also includes a sealing pin 290. After the electrolyte injection is completed, the sealing pin 290 is connected to the top cover plate 210 to seal the injection hole 213. The outer end face of the sealing pin 290 has a groove 291. The outer side of the sealing pin 290 is connected to the inner wall of the injection hole 213 by circumferential welding. In the event of local stress concentration, the sealing pin 290 with the groove 291 can absorb the internal stress through a certain deformation, thereby reducing the warping of the sealing pin 290 caused by welding internal stress.

[0083] It is understandable that the sealing pin 290 can be formed into the groove 291 by stamping.

[0084] It should be noted that the bottom of the groove 291 is provided with a second reinforcing part 292, which protrudes relative to the bottom of the groove 291.

[0085] For example, such as Figure 12 As shown, a second reinforcing part 292 is provided at the bottom of the groove 291, and the second reinforcing part 292 protrudes relative to the bottom of the groove 291. The second reinforcing part 292 can enhance the deformation resistance of the bottom wall of the groove 291.

[0086] It is understood that the second reinforcing part 292 can be configured as a ring-shaped bend or a protrusion, and the bend-shaped second reinforcing part 292 can be formed by stamping.

[0087] The battery pack provided in the second aspect of this application includes a housing and a battery as described in any of the above embodiments, with the battery housed inside the housing. Within the battery pack, a tab limiting member is provided between the cell body and the top cover assembly. The cell tabs pass through tab channels within the tab limiting member, thereby achieving insulation and limiting. On one hand, the tab limiting member is less likely to detach during battery use, effectively insulating the surface of the tabs. On the other hand, during battery production and use, the tab limiting member provides effective protection for the cell tabs, reducing the occurrence of tab tearing and diaphragm insertion, thus improving battery safety and reliability, and consequently enhancing the safety and reliability of the battery pack.

[0088] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application. Furthermore, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other.

Claims

1. A battery, characterized in that, include: A housing, with one end open; A top cover assembly includes a top cover plate and an electrode post. The top cover plate has an electrode post mounting hole, and the electrode post passes through the electrode post mounting hole. The top cover plate is connected to one end of the opening of the housing. A battery cell includes an interconnected body and tabs, the battery cell being housed inside the housing; An electrode tab limiting member is located between the body and the top cover assembly. The electrode tab limiting member has an electrode tab channel through which the electrode tab passes. The electrode tab channel is used to limit the electrode tab. The end of the electrode tab away from the body is exposed in the electrode tab limiting member and connected to the electrode post. The electrode tab limiting member has a first side and a second side opposite to each other. The first side and the second side are respectively located on both sides of the electrode tab limiting member along the width direction of the body. In the direction away from the body, the first side gradually approaches the second side. The first side is arc-shaped and recessed towards the second side. The electrode channel includes a first cavity and a second cavity that are interconnected. The electrode includes a folded portion and a protruding portion that are interconnected. The folded portion extends in the width direction of the body, and the protruding portion extends toward the electrode post. The folded portion is housed inside the first cavity and connected to the body. The protruding portion passes through the second cavity. The end of the protruding portion away from the folded portion protrudes from the electrode limiting member and is connected to the electrode post. In the width direction of the body, the width of the first cavity at the end closer to the body is greater than the width of the second cavity.

2. The battery according to claim 1, characterized in that, In the direction away from the body, the width of the first cavity gradually decreases along the width direction of the body.

3. The battery according to claim 1, characterized in that, The length of the second cavity along the length direction of the body is greater than the width of the protrusion along the length direction of the body.

4. The battery according to claim 1, characterized in that, The width of the second cavity along the width direction of the body is equal to the thickness of the protrusion along the width direction of the body.

5. The battery according to claim 1, characterized in that, In the direction away from the body, the width of the second cavity remains constant along the width direction of the body.

6. The battery according to claim 1, characterized in that, The width of the end of the tab limiting member closest to the body is equal to the width of the body.

7. A battery pack, characterized in that, include: Box; The battery according to any one of claims 1 to 6, wherein the battery is housed inside the housing.

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