Single cell

Abstract

The application provides a single battery, comprising: a cover plate provided with a mounting hole penetrating along a first direction; the cover plate comprises a cover plate body, the cover plate body comprises a first surface and a second surface arranged oppositely along the first direction; the first direction is the thickness direction of the cover plate body; a pole is at least partially arranged in the mounting hole and connected with the cover plate; an insulation assembly comprises an insulation body and a protruding part, the insulation body comprises a third surface and a fourth surface arranged oppositely; along the first direction, the third surface is at least partially connected with the second surface, the fourth surface is away from the second surface, and the protruding part protrudes from the fourth surface to the direction away from the cover plate; an adapter is at least partially arranged on the side of the insulation assembly away from the cover plate and connected with the pole; wherein the protruding part is arranged on both sides of the mounting hole along the width direction of the cover plate, and the two side walls of the protruding part opposite to the mounting hole are at least partially flush with the side walls of the corresponding adapters respectively. The single battery provided by the application is convenient for positioning the adapter.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a single-cell battery. Background Technology

[0002] A single battery cell may include a housing with an open end, and a cover assembly connected to the open end. The cover assembly includes a cover body connected to the housing, an electrode post connected to the cover body, and an adapter connected to the electrode post. The electrode post is electrically connected to an electrode assembly disposed within the housing via the adapter.

[0003] The main body of the pole is usually cylindrical or similar to a cylinder. When the adapter is directly connected to the circular end of the pole, it is difficult to make precise positioning. Utility Model Content

[0004] In view of this, the purpose of this application is to propose a single cell to at least partially solve the problem of the difficulty in achieving precise positioning between the adapter and the circular end of the terminal post.

[0005] Based on the above objectives, a first aspect of this application provides a single-cell battery, comprising: a cover plate having a mounting hole extending along a first direction; the cover plate comprising a cover plate body, the cover plate body comprising a first surface and a second surface disposed opposite to each other along the first direction; the first direction being the thickness direction of the cover plate body; an electrode post, at least partially passing through the mounting hole and connected to the cover plate; an insulating component comprising an insulating body and a protrusion, the insulating body comprising a third surface and a fourth surface disposed opposite to each other; along the first direction, the third surface is at least partially connected to the second surface, the fourth surface is away from the second surface, and the protrusion protrudes from the fourth surface in a direction away from the cover plate; and an adapter, at least partially disposed on the side of the insulating component away from the cover plate and connected to the electrode post; wherein the protrusion is at least disposed on both sides of the mounting hole along the width direction of the cover plate, and the two sidewalls of the protrusion opposite to the mounting hole are at least partially flush with the sidewalls of their respective corresponding adapters.

[0006] Optionally, the adapter includes a fifth end face connected to the pole post; along the first direction, the minimum distance between the fifth end face and the protrusion is greater than 0.1 mm.

[0007] Optionally, the electrode post includes a third end face along the first direction near the second surface, the third end face being located on the side of the protrusion away from the cover plate; the single cell includes an electrode assembly disposed on the side of the adapter away from the insulating component; the adapter includes an electrode post connecting portion and an electrode tab connecting portion disposed along the second direction, the electrode post connecting portion being connected to the third end face, and the electrode tab connecting portion being connected to the electrode tab of the electrode assembly; the second direction is perpendicular to the first direction; wherein, the electrode post connecting portion includes two first sidewalls opposite to the mounting hole along the width direction of the cover plate, the two first sidewalls being at least partially flush with the sidewall of their respective corresponding protrusions.

[0008] Optionally, the protrusion is continuously arranged around the mounting hole, and the outer periphery of the projection of the protrusion along the first direction is a square surrounding the mounting hole.

[0009] Optionally, the cover plate further includes a fixing portion connected to the cover plate body, the fixing portion extending at least from the second surface in the first direction away from the cover plate body, such that the fixing portion protrudes from the second surface; the insulating component is provided with a recessed portion relative to the third surface, the recessed portion corresponding to the protrusion, the recessed portion accommodating the portion of the fixing portion protruding from the second surface.

[0010] Optionally, the insulating component includes a sealing ring disposed between the pole and the fixing part, the sealing ring protruding from the fixing part in a direction away from the first surface along the first direction; the groove includes a first groove and a second groove, the first groove accommodating the fixing part and the second groove accommodating the sealing ring.

[0011] Optionally, the sealing ring abuts against the second groove to form a sealing connection.

[0012] Optionally, the protrusion includes a first protrusion and a second protrusion. The first protrusion includes a first end face away from the fourth surface, and the second protrusion protrudes from the first end face in a direction away from the cover plate body. The first protrusion corresponds to the position of the first groove, and the second protrusion corresponds to the position of the second groove.

[0013] Optionally, the protrusion includes a third protrusion, which is disposed along the outer edge of the first end face and protrudes from the first end face in a direction away from the cover plate body; the second protrusion includes a second end face away from the fourth face, and the third protrusion includes a fourth end face away from the fourth face; the pole includes a third end face close to the second face along the first direction; the third end face is located on the side of the protrusion away from the cover plate, and the adapter includes a fifth end face connected to the third end face; along the first direction, the minimum interval distances between the first end face, the second end face, and the fourth end face and the fifth end face are H7, H1, and H3, respectively; H7 > H1 > H3; or, A reinforcing rib connecting the third protrusion and the second protrusion is provided on the first end face.

[0014] Optionally, the fixing part and the groove part are spaced apart, and along the first direction, the minimum distance between the outer wall of the fixing part and the groove part is H2, 0.05mm≤H2≤0.5mm.

[0015] Optionally, the surface of the protrusion away from the cover plate is flat, and the bottom of the groove is provided with an annular protrusion that protrudes around the center line of the mounting hole and toward the fixing part. The annular protrusion is provided in at least one circle along the radial direction of the mounting hole. The annular protrusions may be continuously or intermittently arranged along the circumferential direction; and / or The protrusion height of the annular protrusion is less than the depth of the groove.

[0016] As can be seen from the above, the single-cell battery provided in this application has a protruding protrusion on the bottom surface of the insulating body of the insulating component, which fixes the relative position between the terminal and the protrusion. When the side wall of the adapter is at least partially flush with the corresponding side wall of the protrusion, the adapter can achieve a relatively precise positioning with the terminal by means of the protrusion. Therefore, after the adapter and the terminal are connected, the connection strength and electrical performance between them can be guaranteed, which helps to improve the electrical performance and safety performance of the single-cell battery. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A partial cross-sectional schematic diagram of a single cell with the first structure is shown; Figure 2 This is a schematic diagram of a single-cell battery with a second structure according to an embodiment of this application; Figure 3 This is a top view schematic diagram of a single-cell battery with a second structure according to an embodiment of this application; Figure 4 for Figure 3 Partial cross-sectional diagram of section AA; Figure 5 for Figure 3 Partial cross-sectional diagram of section BB; Figure 6 This is a schematic diagram of the third side of the insulating body of a single cell with the second structure according to an embodiment of this application; Figure 7 This is a schematic diagram of the fourth side of the insulating body of a single cell with the second structure according to an embodiment of this application; Figure 8 This is a partial bottom view of a single cell of the second structure without the adapter installed, according to an embodiment of this application. Figure 9 This is a partial bottom view of a single-cell battery with an adapter installed according to an embodiment of this application. Figure 10 This is a schematic diagram of the fourth side of the insulating body of a single-cell battery with the third structure according to an embodiment of this application; Figure 11 This is a fourth type of single-cell battery structure in the embodiments of this application. Figure 3 Partial cross-sectional diagram of section BB; Figure 12 This is a schematic diagram of the third side of the insulating body of a single-cell battery with the fourth structure according to an embodiment of this application; Figure 12a for Figure 12 An enlarged schematic diagram of section C; Figure 13 This is a schematic diagram of the fourth side of the insulating body of a single-cell battery with a fourth structure according to an embodiment of this application.

[0019] Explanation of reference numerals in the attached figures: 1000, Cover plate assembly; 100. Cover plate; 110. Cover plate body; 111. Mounting hole; 112. First surface; 113. Second surface; 120. Fixing part; 121. First fixing part; 122. Second fixing part; 200. Insulating component; 210. Insulating body; 211. Third surface; 212. Fourth surface; 220. Groove portion; 221. First groove; 222. Second groove; 230. Protrusion portion; 231. First protrusion; 2311. First end face; 232. Second protrusion; 2321. Second end face; 233. Third protrusion; 2331. Fourth end face; 240. Annular protrusion; 250. Reinforcing rib; 260. Sealing ring; 270. Upper insulating component; 280. Upper insulating portion; 290. Lower insulating component; 300, pole post; 310, third end face; 320, pole post body; 330, protrusion; 340, pole post base plate; 400. Riveting block; 2000, housing; 2100, open end; 3000, Adapter; 3100, Pole post connection; 3110, First sidewall; 3120, Fifth end face; 3200, Pole lug connection; 4000, Electrode assembly; 4100, Electrode body; 4200, Tab. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0021] It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components described in these embodiments do not limit the scope of this application.

[0022] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0023] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0024] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0025] Figure 1 A partial cross-sectional schematic diagram of the first type of single-cell battery is shown.

[0026] like Figure 1 In some embodiments, the single battery cell includes a cover assembly 1000 and a housing 2000. The cover assembly 1000 includes a cover body 110, which is provided with a portion along its thickness direction (e.g., ...). Figure 1 A mounting hole 111 (in the Z direction) is provided, and the cover plate body 110 is connected to the opening end 2100 of the housing 2000 so that the cover plate body 110 and the housing 2000 together form a space for accommodating the electrode assembly 4000. A lower insulating member 290 is connected to the side of the cover plate body 110 near the electrode assembly 4000, and an upper insulating member 270 is connected to the side of the cover plate body 110 away from the electrode assembly 4000.

[0027] The cover plate assembly 1000 also includes an electrode post 300, which includes a cylindrical electrode post body 320 and an electrode post base plate 340 electrically connected to the electrode post body 320 near one end of the electrode assembly 4000. The electrode post body 320 is fitted with a sealing ring 260 and has a lower insulating member 290, a cover plate body 110, and an upper insulating member 270 passing through it. The end of the electrode post body 320 away from the electrode assembly 4000 extends out of the upper insulating member 270 and is riveted to a riveting block 400. The riveting block 400 and the electrode post base plate 340 cooperate to clamp the sealing ring 260, the lower insulating member 290, the cover plate body 110, and the upper insulating member 270, so as to seal the electrode post 300 and the cover plate body 110 through the sealing ring 260, and to insulate the electrode post 300 and the cover plate body 110 through the upper insulating member 270 and the lower insulating member 290.

[0028] An adapter 3000 is connected to one end of the electrode post 300 near the electrode assembly 4000. The electrode assembly 4000 includes an electrode body 4100 and a tab 4200 extending from the electrode body 4100. The tab 4200 is electrically connected to the electrode post 300 via the adapter 300.

[0029] To ensure the reliability of the connection and electrical performance between the tab 4200 and the pole 300, the relative position between the adapter 3000 and the pole 300 must meet the assembly requirements.

[0030] The applicant's research found that the part of the adapter 3000 that connects to the pole post 300 is usually a rectangular sheet structure. In order to facilitate the positioning of the adapter 3000 and the pole post base plate 340, the pole post base plate 340 needs to be designed as a rectangular structure according to the projection shape of the adapter 3000 along the thickness direction of the cover plate 100. When the side wall of the adapter 3000 is aligned with the side wall of the pole post base plate 340, the two can achieve relatively accurate positioning.

[0031] However, adding a base plate 340 to each pole body 320 will not only significantly increase the material cost of the cover plate assembly 1000, but also make the assembly process of the cover plate assembly 1000 more complicated because the base plate 340 needs to be welded to the pole body 320 (e.g., friction welding).

[0032] To address the aforementioned issues, this embodiment provides a single-cell battery with other structures.

[0033] Figure 2 A schematic diagram of a single cell with the second structure is shown. Figure 3 A top-view schematic diagram of the second type of single-cell battery structure is shown. Figure 4 Showing Figure 3 Partial cross-sectional diagram of section AA. Figure 5 Showing Figure 3 A partial cross-sectional view of section BB.

[0034] like Figure 2 , Figure 3 , Figure 4 and Figure 5In some embodiments, the single cell includes: a cover plate 100 having a mounting hole 111 extending along a first direction; the cover plate 100 includes a cover plate body 110, the cover plate body 110 including a first surface 112 and a second surface 113 disposed opposite to each other along the first direction; the first direction is the thickness direction of the cover plate body 110; an electrode post 300, at least partially passing through the mounting hole 111 and connected to the cover plate 100; and an insulating assembly 200 including an insulating body 210 and a protrusion 230, the insulating body 210 including a third surface 211 and a fourth surface 212 disposed opposite to each other ... the first direction is the thickness direction of the cover plate body 110; the electrode post 300, at least partially passing through the mounting hole 111 and connected to the cover plate 100; and an insulating assembly 200 including an insulating body 210 and a protrusion 230, the insulating body 210 including a third surface 211 and a fourth surface 212 disposed opposite to each other along the first direction; the first direction is the thickness direction of the cover plate body 110; the first direction is the thickness direction of the cover plate body 110; the first direction is the thickness direction of the cover plate body 110; the first direction is the thickness direction of the cover plate body 110; the first direction is the thickness direction of the cover plate body 110; the first direction is the thickness direction of the cover plate body 11 In the direction, the third surface 211 is at least partially connected to the second surface 113, the fourth surface 212 is away from the second surface 113, and the protrusion 230 protrudes from the fourth surface 212 in a direction away from the cover plate 100; the adapter 3000 is at least partially disposed on the side of the insulating assembly 200 away from the cover plate 100 and is connected to the pole post 300; wherein, the protrusion 230 is at least disposed on both sides of the mounting hole 111 along the width direction of the cover plate 100, and the two side walls of the protrusion 230 opposite to the mounting hole 111 are at least partially flush with the side wall of their respective adapter 3000.

[0035] For example, the cover plate body 110 can be a plate-shaped structure, and the plate surface of the cover plate body 110 can be provided with grooves or protrusions.

[0036] For example, the insulating body 210 can be a plate-like structure, and the surface of the insulating body 210 can be provided with grooves, through holes or protrusions.

[0037] For example, the cross-sectional shape of the pole post 300 (unless otherwise specified, the cross-section of the pole post 300 refers to the cross-section perpendicular to the center line of the pole post 300) can be circular or elliptical.

[0038] For example, the circumferential sidewall of the pole post 300 may be provided with a groove or a protrusion structure.

[0039] For example, the pole post 300 can be connected to the cover plate body 110 by means of plug-in, snap-in, fastener or thermoplastic part.

[0040] For example, the insulating body 210 can be connected to the cover plate body 110 by means of adhesive, plugging, snap-fitting, fasteners or hot pressing.

[0041] For example, the insulating body 210 is provided with a through hole through which the pole post 300 passes, the center line of which coincides with the center line of the mounting hole 111.

[0042] For example, the adapter 3000 can be a sheet structure and is electrically connected to the pole 300 by welding.

[0043] For example, the protrusion 230 can be a solid protrusion structure, or it can be a thin-walled protrusion structure that protrudes away from the cover plate body 110.

[0044] For example, the protrusion 230 may be provided continuously or discontinuously around the mounting hole 111.

[0045] In this embodiment, the protrusion 230 protruding from the insulating body 210 has a sidewall, and the pole post 300 is along a third direction (the third direction is perpendicular to the first direction, such as...). Figure 5 If the relative position between the pole post 300 (in the Y direction) and the insulating component 200 is fixed, then the relative position between the pole post 300 and the side wall of the protrusion 230 in the third direction is also fixed.

[0046] When the adapter 3000 needs to be positioned with the pole post 300, the side wall of the adapter 3000 can be aligned with the side wall of the corresponding protrusion 230 to achieve positioning between the two. At the same time, since the relative position between the pole post 300 and the side wall of the protrusion 230 along the third direction is fixed, the positioning between the adapter 3000 and the pole post 300 is also achieved.

[0047] Meanwhile, the two sidewalls of the protrusion 230 opposite to the mounting hole 111 are at least partially flush with the sidewalls of their respective adapters 3000. The positioning between the adapters 3000 and the protrusion 230 can be achieved by using the grippers on the single-cell production line, so that the cover assembly 1000 of this embodiment can be adapted to the single-cell production line, saving the modification cost of the single-cell production line.

[0048] Specifically, the gripper may have two clamping portions that can approach each other to achieve clamping. The portion of the adapter 3000 corresponding to the pole post 300 is placed between the two clamping portions, and the protrusion 230 is also placed between the two clamping portions. When the two clamping portions approach each other until they abut against the two side walls of the protrusion 230, under the limiting action of the two clamping portions, the two side walls of the adapter 3000 facing the clamping portions and opposite to each other also abut against their respective clamping portions. At this time, the two side walls of the protrusion 230 can be at least partially flush with the side walls of their respective adapter 3000, thereby achieving the positioning of the adapter 3000, the protrusion 230, and the pole post 300.

[0049] The single-cell battery provided in this embodiment has a protruding protrusion 230 on the bottom surface of the insulating body 210 of the insulating component 200, which fixes the relative position between the terminal post 300 and the protrusion 230. When the side wall of the adapter 3000 is at least partially flush with the corresponding side wall of the protrusion 230, the adapter 3000 can achieve a relatively precise positioning with the terminal post 300 by means of the protrusion 230, thereby ensuring the connection strength and electrical performance between the adapter 3000 and the terminal post 300 after they are connected.

[0050] Meanwhile, the two side walls of the protrusion 230 and the two corresponding side walls of the adapter 3000 can be clamped by the grippers on the single cell production line. Under the clamping action of the grippers, the two side walls of the protrusion 230 opposite to the mounting hole 111 are at least partially flush with the side walls of their respective adapters 3000. This ensures that when the adapter 3000 is connected to the terminal post 300, the adapter 3000 is accurately positioned with the terminal post 300 by means of the protrusion 230.

[0051] As can be seen from the comparison between the first and second types of single-cell batteries, the second type of single-cell battery achieves positioning with the adapter 3000 by providing a protrusion 230 on the insulating component 200, which replaces the terminal base plate 340 in the first type of single-cell battery. Since the protrusion 230 and the insulating body 210 can be integrally formed and connected, and are made of non-metallic materials, the overall weight and material cost of the single-cell battery can be reduced, and the assembly process can be simplified, thus improving assembly efficiency.

[0052] like Figure 5 In some embodiments, the adapter 3000 includes a fifth end face 3120 connected to the pole post 300; along the first direction, the minimum interval distance (hereinafter referred to as the first interval distance) between the fifth end face 3120 and the protrusion 230 is greater than 0.1 mm.

[0053] For example, the first interval distance can be 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm or 0.7mm.

[0054] It should be noted that, with Figure 5 Taking the structure shown as an example, the first interval distance is H3 as shown in the figure.

[0055] If the first gap is too small, when the adapter 3000 is welded to the pole post 300 or the tab 4200 of the electrode assembly 4000, the heat generated at the welding point will be transferred to the protrusion 230 excessively, which may cause the protrusion 230 to deform due to heat, thereby causing the insulation assembly 200 to fail.

[0056] To avoid the aforementioned problems, this embodiment designs the first gap distance to be greater than 0.1 mm, which allows the protrusion 230 to maintain a sufficient gap distance with the fifth end face 3120 of the adapter 3000 along the first direction. When the adapter 3000 is welded to the pole post 300 or to the tab 4200 of the electrode assembly 4000, the heat transferred to the protrusion 230 can be effectively reduced, preventing the protrusion 230 from deforming due to heat, and ensuring that the insulating assembly 200 achieves stable and reliable insulation performance.

[0057] Figure 8 This is a partial bottom view of a single cell with the second structure of the 3000 without the adapter installed. Figure 9 A partial bottom view of a single cell with a second structure and adapter 3000 installed is shown.

[0058] like Figure 5 , Figure 8 and Figure 9 In some embodiments, the electrode post 300 includes a third end face 310 along a first direction near the second surface 113, the third end face 310 being located on the side of the protrusion 230 away from the cover plate 100; the single cell includes an electrode assembly 4000 disposed on the side of the adapter 3000 away from the insulating component 200; the adapter 3000 includes an electrode assembly 4000 along a second direction (e.g., ... Figure 8 The electrode post connection portion 3100 and the electrode tab connection portion 3200 are arranged in the X direction. The electrode post connection portion 3100 is connected to the third end face 310, and the electrode tab connection portion 3200 is connected to the electrode tab 4200 of the electrode assembly 4000. The second direction is perpendicular to the first direction. The electrode post connection portion 3100 includes two first sidewalls 3110 that are opposite to the mounting hole 111 along the width direction of the cover plate 100. The two first sidewalls 3110 are at least partially flush with the sidewall of their respective first protrusions 230.

[0059] For example, the tab connection portion 3200 can be along the width direction of the cover plate 100 (e.g. Figure 9 There are two Y-direction (Y-direction) settings, and they are symmetrically arranged with respect to the pole post connection 3100.

[0060] For example, the pole post connection portion 3100 and the pole tab connection portion 3200 can be electrically connected by means of integral molding or welding.

[0061] For example, the electrode connection portion 3100 is welded to the electrode 300 to achieve electrical connection, and the electrode tab connection portion 3200 is welded to the electrode tab 4200 of the electrode assembly 4000 to achieve electrical connection.

[0062] Understandably, once the pole connector 3100 achieves relatively precise positioning with the pole 300 via the protrusion 230, the adapter 3000 as a whole can complete its positioning.

[0063] The positioning method and beneficial effects of the pole post connection 3100 through the two first side walls 3110 and the protrusion 230 are similar to those described above, and will not be repeated here.

[0064] like Figure 5 , Figure 6 and Figure 7 In some embodiments, the protrusion 230 is continuously provided around the mounting hole 111, and the outer periphery of the projection of the protrusion 230 along the first direction is a square surrounding the mounting hole 111.

[0065] It should be noted that the square in this embodiment may include a right-angled square or a rectangular square.

[0066] For example, the cross-sectional profile of the protrusion 230 facing the inner wall of the pole post 300 may be the same as or different from the cross-sectional shape of the pole post 300.

[0067] For example, the inner wall of the protrusion 230 facing the pole post 300 may fit against the circumferential sidewall of the pole post 300 or there may be a small gap between the two.

[0068] When the protrusion 230 is continuously arranged around the mounting hole 111, it helps to improve the structural strength of the protrusion 230 and prevent the protrusion 230 from deforming when it is clamped by a tool.

[0069] Meanwhile, the outer periphery of the projection of the protrusion 230 along the first direction is square, which can make the area of ​​the two side walls of the protrusion 230 opposite to the mounting hole 111 larger. When it is clamped by a tool, the tool can make more reliable contact with the side wall of the protrusion 230, so that the side wall of the adapter 3000 is aligned with the side wall of the corresponding protrusion 230, thereby ensuring a more accurate positioning between the adapter 3000 and the protrusion 230.

[0070] Combination Figure 5In some embodiments, the cover plate 100 further includes a fixing portion 120 connected to the cover plate body 110. The fixing portion 120 may include a first fixing portion 121 and a second fixing portion 122. The first fixing portion 121 extends from the first surface 112 at least along a first direction away from the cover plate body 110, and the second fixing portion 122 extends from the second surface 113 at least towards the center line of the mounting hole 111. Both the first fixing portion 121 and the second fixing portion 122 are arranged circumferentially around the center line of the mounting hole 111.

[0071] It should be noted that the second fixing part 122 can extend entirely from the second surface 113 toward the center line of the mounting hole 111, at which time the second fixing part 122 is flush with the second surface 113.

[0072] In addition, the second fixing part 122 can also be configured in other ways. For example, the portion of the second fixing part 122 near the cover plate body 110 extends from the second surface 113 in a direction away from the first surface 112, and the portion of the second fixing part 122 near its free end extends in a direction toward the center line of the mounting hole 111, such as... Figure 5 .

[0073] The electrode post 300 includes a columnar electrode post body 320 and a protrusion 330 arranged circumferentially along the outer wall of the electrode post body 320. The protrusion 330 is disposed between the first fixing part 121 and the second fixing part 122 in a first direction. The second fixing part 122 can support the protrusion 330 of the electrode post 300. The sealing ring 260 is fitted onto the electrode post body 320 and disposed between the protrusion 330 and the second fixing part 122.

[0074] An insulating connection can be achieved between the cover plate 100 and the pole post 300 via an upper insulating portion 280 formed by injection molding. Specifically, after the protrusion 330 and the second fixing portion 122 cooperate to compress the sealing ring 260 and deform it to create a sealing effect, injection molding material is injected into the mounting hole 111. The injection molding material may only fill the internal space of the mounting hole 111, or it may overflow from the mounting hole 111 and wrap around the first fixing portion 121. After the injection molding material cures, the upper insulating portion 280 is formed. Under the action of the upper insulating portion 280, the relative position of the cover plate 100 and the pole post 300 remains fixed.

[0075] When the second fixing part 122 is designed as follows Figure 5 In the structure shown, it protrudes from the second surface 113. In order to prevent the insulating component 200 from interfering with the second fixing part 122, it is necessary to provide a groove on the insulating component 200 that corresponds to the second fixing part 122.

[0076] like Figure 5In some embodiments, the cover plate 100 further includes a fixing portion 120 connected to the cover plate body 110. The fixing portion 120 extends at least from the second surface 113 in a first direction away from the cover plate body 110, such that the fixing portion 120 protrudes from the second surface 113. The insulating component 200 is provided with a groove portion 220 that is recessed relative to the third surface 211. The groove portion 220 corresponds to the position of the protrusion 230 and accommodates the portion of the fixing portion 120 that protrudes from the second surface 113.

[0077] It should be noted that, in this embodiment, the portion of the fixing part 120 that protrudes from the second surface 113 is the second fixing part 122.

[0078] For example, the fixing part 120 and the cover plate body 110 can be connected by welding or integral molding.

[0079] It should be noted that the fixing part 120 is arranged around the center line of the mounting hole 111. In order to accommodate the fixing part 120, the groove part 220 is also arranged around the center line of the mounting hole 111, and is an annular groove; the protrusion part 230 corresponding to the groove part 220 is also arranged around the center line of the mounting hole 111, and is an annular protrusion.

[0080] Understandably, when the protrusion 230 and the insulating body 210 are integrally formed into a structural component through injection molding, if the protrusion 230 is a solid protrusion, its thickness will be relatively large, while the insulating body 210's thickness will be relatively small. This results in an uneven overall thickness of the structural component. During injection molding, warping or shrinkage may occur at the locations with thickness differences between the protrusion 230 and the insulating body 210. This could cause interference between the insulating component 200 and the cover plate 100 during assembly, leading to assembly difficulties. Furthermore, if the insulating component 200 shrinks, parts of the cover plate 100 may be exposed, resulting in poor insulation performance of the individual cells and adversely affecting their safety.

[0081] To avoid the aforementioned problems, the groove 220 and the protrusion 230 are designed to correspond in position. The thickness of the protrusion 230 can be reduced by the groove 220, making the protrusion 230 a hollow, thin-walled protrusion structure. This allows the thickness of the protrusion 230 to approach the thickness of the insulating body 210, effectively reducing the thickness difference between them. This results in a more uniform thickness of the structure and prevents warping and shrinkage due to thickness differences. This ensures that the insulating component 200 can provide insulation to the cover plate 100 while preventing interference between them, facilitating the assembly of individual cells and improving assembly efficiency and safety performance.

[0082] Figure 6 A schematic diagram of the third surface 211 of the insulating body 210 of the second type of single-cell battery is shown. Figure 7 A schematic diagram of the fourth side 212 of the insulating body 210 of the second type of single cell is shown.

[0083] like Figure 5 , Figure 6 and Figure 7 In some embodiments, the insulating component 200 includes a sealing ring 260 disposed between the pole post 300 and the fixing part 120, and the sealing ring 260 protrudes from the fixing part 120 in a direction away from the first surface 112 along a first direction; the groove part 220 includes a first groove 221 and a second groove 222, the first groove 221 accommodating the fixing part 120, and the second groove 222 accommodating the sealing ring 260.

[0084] It should be noted that the bottom of the second groove 222 is recessed relative to the bottom of the first groove 221.

[0085] Combination Figure 5 When assembling the pole post 300 into the cover plate 100, the sealing ring 260 can be fitted onto the pole post 300 first. Then, the pole post 300 with the sealing ring 260 installed is inserted into the mounting hole 111, and the sealing ring 260 contacts the fixing part 120.

[0086] Then, the pole post 300 can be pressed to deform the sealing ring 260 under the pressure of the pole post 300 and the fixing part 120 to produce a sealing effect, and in this state (keeping the pole post 300 pressed), the relative position of the pole post 300 and the cover plate 100 is fixed (for example, by the upper insulating part 280).

[0087] When deformed under pressure, the sealing ring 260 extends outward from the mounting hole 111 to ensure a relatively reliable seal on the mounting hole 111. After the pole post 300 and the cover plate 100 are fixed relative to each other, the sealing ring 260 protrudes downward from the outer wall of the fixing part 120 in the first direction.

[0088] When the terminal post 300 is fixed, the groove portion 220 has not yet been assembled with the cover plate 100. After the terminal post 300 is fixed, when connecting the groove portion 220 to the cover plate 100, if the bottom of the groove portion 220 exerts a large pressure on the sealing ring 260, the rebound force generated after the sealing ring 260 deforms will also be too large, which will force the groove portion 220 to separate from the cover plate 100, which will have an adverse effect on the insulation performance of the single cell.

[0089] To solve the above problems, the groove portion 220 of this embodiment is provided with a first groove 221 and a second groove 222. The first groove 221 is used to accommodate the fixing portion 120 to prevent interference between the groove portion 220 and the fixing portion 120. The second groove 222 is used to accommodate the sealing ring 260 to prevent the groove portion 220 from excessively compressing the sealing ring 260. This helps to improve the connection reliability of the insulating component 200 and the cover plate 100 and ensure the safety performance of the single battery cell.

[0090] like Figure 5 In some embodiments, the sealing ring 260 abuts against the second groove 222 to form a sealing connection.

[0091] As can be seen from the foregoing, after being deformed under pressure, the sealing ring 260 can form a sealed connection with the contact surface (i.e., the surface of the force exerted), making it difficult for fluid to enter between the sealing ring 260 and the contact surface.

[0092] In this embodiment, by designing the depth of the second groove 222, the bottom of the groove exerts a small pressure on the sealing ring 260 located in the second groove 222, causing the sealing ring 260 to deform in a way that produces a sealing effect, and the rebound force generated by the deformation will not have an excessively adverse effect on the connection reliability between the groove 220 and the cover plate 100.

[0093] Combination Figure 5 Both the first groove 221 and the second groove 222 surround the through hole through which the electrode post 300 passes. When the sealing ring 260 in the second groove 222 is sealed to the bottom of the groove, the through hole can be effectively blocked by the sealing ring 260 and the electrode post 300, preventing the electrolyte in the single cell from passing through the through hole, which helps to improve the sealing performance and safety performance of the single cell.

[0094] like Figure 5 , Figure 6 and Figure 7 In some embodiments, the protrusion 230 includes a first protrusion 231 and a second protrusion 232. The first protrusion 231 includes a first end face 2311 away from the fourth surface 212, and the second protrusion 232 protrudes from the first end face 2311 in a direction away from the cover plate body 110. The first protrusion 231 corresponds to the first groove 221, and the second protrusion 232 corresponds to the second groove 222.

[0095] For example, the protrusion height L2 of the second protrusion 232 relative to the first end face 2311 is the same as the depth H5 of the second groove 222.

[0096] For example, the protrusion height L1 of the first protrusion 231 relative to the fourth surface 212 is the same as the depth H4 of the first groove 221.

[0097] It should be noted that the second protrusion 232, corresponding to the second groove 222, is arranged around the center line of the mounting hole 111 and along the inner edge of the first end face 2311, and is in the form of annular protrusion.

[0098] In this embodiment, a second protrusion 232 is provided on the first end face 2311 at a position corresponding to the second groove 222. This makes the thickness of the second protrusion 232 in the protrusion 230 similar to the thickness of the part without the second protrusion 232, thereby effectively reducing the overall thickness difference of the protrusion 230 and making the thickness of the protrusion 230 more uniform, effectively preventing warping and shrinkage due to the thickness difference.

[0099] like Figure 5 In some embodiments, the protrusion 230 includes a third protrusion 233, which is disposed along the outer edge of the first end face 2311 and protrudes from the first end face 2311 in a direction away from the cover plate body 110; the second protrusion 232 includes a second end face 2321 away from the fourth face 212, and the third protrusion 233 includes a fourth end face 2331 away from the fourth face 212; the pole post 300 includes a third end face 310 close to the second face 113 along the first direction; the third end face 310 is located on the side of the protrusion 230 away from the cover plate 100, and the adapter 3000 includes a fifth end face 3120 connected to the third end face 310; along the first direction, the minimum interval distances between the first end face 2311, the second end face 2321 and the fourth end face 2331 and the fifth end face 3120 are H7, H1 and H3 respectively; H7 > H1 > H3.

[0100] For example, H1 > 0.3 mm. For instance, H1 can be 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, or 0.7 mm.

[0101] For example, H3 > 0.1 mm. For instance, H3 can be 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, or 0.7 mm.

[0102] It should be noted that when the third protrusion 233 is set along the outer edge of the first end face 2311, the outer side wall of the third protrusion 233 is flush with the side wall of the first protrusion 230. In other words, the outer side wall of the third protrusion 233 can also be used to position the adapter 3000.

[0103] A third protrusion 233 is provided along the outer edge of the first end face 2311, which can effectively increase the side wall area of ​​the first protrusion 230. When positioning the adapter 3000, the grippers and other auxiliary equipment can more firmly clamp the first protrusion 230 and the adapter 3000, which helps to improve the positioning accuracy of the adapter 3000.

[0104] Combination Figure 5 As can be seen, along the third direction, the third protrusion 233 is farther from the pole post 300, while the second protrusion 232 is closer to the pole post 300. Understandably, the closer it is to the pole post 300, the greater the heat received when the pole post 300 is welded to the fifth end face 3120 of the adapter 3000, and the greater the risk of thermal deformation.

[0105] To prevent the protrusion 230 from deforming due to heat, in this embodiment, H1 and H3 are designed such that H1 > H3, which ensures that the second protrusion 232 maintains a sufficient distance from the fifth end face 3120 along the first direction. When the pole post 300 is welded to the fifth end face 3120 of the adapter 3000, the heat transferred to the second end face 2321 is effectively reduced, preventing the second protrusion 232 from deforming due to heat and ensuring that the insulating assembly 200 achieves stable and reliable insulation performance.

[0106] Figure 10 A schematic diagram of the fourth side 212 of the insulating component 200 of the third type of single cell is shown.

[0107] like Figure 10 In some embodiments, a reinforcing rib 250 connecting the third protrusion 233 and the second protrusion 232 is provided on the first end face 2311.

[0108] For example, multiple reinforcing ribs 250 may be provided and are evenly arranged around the through holes through which the pole post 300 passes in the insulating assembly 200.

[0109] The second protrusion 232 is connected to the third protrusion 233 through the reinforcing rib 250, which enables the second protrusion 232 to support the third protrusion 233 through the reinforcing rib 250, reducing the risk of deformation of the third protrusion 233 when it is clamped by the gripper.

[0110] Figure 11 The fourth type of single-cell battery structure was demonstrated. Figure 3 Partial cross-sectional diagram of section BB. Figure 12 A schematic diagram of the third surface 211 of the insulating body 210 of the fourth type of single-cell battery is shown. Figure 12a Showing Figure 12 An enlarged diagram of section C. Figure 13 A schematic diagram of the fourth surface 212 of the insulating body 210 of the fourth type of single cell is shown.

[0111] like Figure 11 , Figure 12 , Figure 12a and Figure 13 In some embodiments, the surface of the protrusion 230 away from the cover plate 100 is flat, and the bottom of the groove 220 is provided with an annular protrusion 240 that protrudes around the center line of the mounting hole 111 and toward the fixing part 120. The annular protrusion 240 is arranged in at least one ring along the radial direction of the mounting hole 111. The annular protrusion 240 is arranged continuously or intermittently along the circumference.

[0112] For example, the groove portion 220 includes a first groove 221 for receiving the fixing portion 120 and a second groove 222 for receiving the sealing ring 260, and an annular protrusion 240 is provided at least at the bottom of the first groove 221.

[0113] It should be noted that in this embodiment, the straight-line distance H6 between the bottom of the groove portion 220 and the outer wall of the fixing portion 120 along the first direction is relatively large. Correspondingly, the protrusion height of the protrusion portion 230 relative to the fourth surface 212 is also relatively large. When the gripper contacts the side wall of the protrusion portion 230, it has a large contact area, which can ensure that the gripper can stably clamp the protrusion portion 230.

[0114] However, during the charging and discharging of a single battery cell, the electrode assembly 4000 may expand. When the protrusion 230 is under pressure, if H6 is too large, the bottom of the groove 220 may not be reliably supported by the fixing part 120, which may cause the first end face 2311 of the protrusion 230 to deform.

[0115] To avoid the aforementioned problems, this embodiment provides an annular protrusion 240 at the bottom of the groove 220. The annular protrusion 240 can approach the outer wall of the fixing part 120 along the first direction. In this way, while keeping the overall thickness of the groove 220 constant, when the protrusion 230 is pressed, the outer wall of the fixing part 120 can abut against the annular protrusion 240 to support the bottom of the groove 220 and prevent the first end face 2311 of the protrusion 230 from deforming.

[0116] When the annular protrusion 240 is in a continuous ring shape, the annular protrusion 240 has greater structural strength and can reliably support the bottom of the groove 220.

[0117] When the annular protrusion 240 is designed to be discontinuously arranged along the circumference, if there is electrolyte in the groove 220, the electrolyte can flow radially towards the center line of the mounting hole 111 through the break in the annular protrusion 240 until it flows out of the groove 220, which can prevent electrolyte from remaining in the groove 220.

[0118] like Figure 5 and Figure 11 In some embodiments, the fixing part 120 and the groove part 220 are spaced apart, and along the first direction, the minimum distance between the outer wall of the fixing part 120 and the groove part 220 is H2, 0.05mm≤H2≤0.5mm.

[0119] For example, H2 can be 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm or 0.5mm.

[0120] It should be noted that, as Figure 5 For the second type of single-cell battery, H2 is the minimum distance between the outer wall of the fixing part 120 and the bottom of the first groove 221. For example... Figure 11 For the fourth type of single cell, H2 is the minimum distance between the outer wall of the fixing part 120 and the annular protrusion 240.

[0121] If H2 is too small, the fixing part 120 may easily interfere with the bottom of the groove of the groove 220 during assembly. If H2 is too large, in conjunction with the above, the fixing part 120 may have difficulty providing reliable support for the groove 220, and the first end face 2311 of the protrusion 230 may deform under pressure.

[0122] To avoid the aforementioned problems, this embodiment designs H2 to be 0.05mm≤H2≤0.5mm, ensuring that the fixing part 120 and the groove part 220 are spaced apart to prevent interference between them, which helps to improve the safety performance of the single battery. At the same time, when the protrusion 230 is pressed, the fixing part 120 can support the bottom of the groove part 220 to prevent the first end face 2311 from deforming.

[0123] In some embodiments, the protrusion height of the annular protrusion 240 is less than the depth of the groove 220.

[0124] The groove 220 is used to accommodate the fixing part 120 protruding from the second surface 113. If the protrusion height of the annular protrusion 240 is greater than the depth of the groove 220, it may cause interference between the annular protrusion 240 and the fixing part 120.

[0125] To avoid the above problems, in this embodiment, the protrusion height of the annular protrusion 240 is designed to be less than the depth of the groove 220, which can effectively prevent the annular protrusion 240 from interfering with the fixing part 120, ensuring that the cover plate 100 can be reliably connected with the insulating component 200, which helps to improve the insulation performance and safety performance of the single battery.

[0126] It should be noted that some embodiments of this application have been described above. Other embodiments are within the scope of the appended claims.

[0127] The various embodiments in this application are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0128] The description in this application is given for illustrative purposes and is not intended to be exhaustive or to limit the application to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of this application and to enable those skilled in the art to understand this application and design various embodiments with various modifications suitable for a particular purpose.

[0129] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application is limited to these examples; under the concept of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in detail for the sake of brevity.

[0130] Although this application has been described in conjunction with specific embodiments thereof, many substitutions, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description.

[0131] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A single-cell battery, characterized in that, include: A cover plate is provided with a mounting hole that extends through a first direction; the cover plate includes a cover plate body, the cover plate body including a first surface and a second surface disposed opposite to each other along the first direction; the first direction is the thickness direction of the cover plate body; The pole post is at least partially inserted through the mounting hole and connected to the cover plate; An insulating component includes an insulating body and a protrusion, the insulating body including a third surface and a fourth surface disposed opposite to each other; along a first direction, the third surface is at least partially connected to the second surface, the fourth surface is away from the second surface, and the protrusion protrudes from the fourth surface in a direction away from the cover plate; An adapter is at least partially disposed on the side of the insulating assembly away from the cover plate and connected to the pole post; The protrusion is provided on at least two sides of the mounting hole along the width direction of the cover plate, and the two sidewalls of the protrusion opposite to the mounting hole are at least partially flush with the sidewalls of their respective corresponding adapters.

2. The single-cell battery according to claim 1, characterized in that, The adapter includes a fifth end face that is connected to the pole post; along the first direction, the minimum distance between the fifth end face and the protrusion is greater than 0.1 mm.

3. The single-cell battery according to claim 1, characterized in that, The pole post includes a third end face that is close to the second surface along the first direction, and the third end face is located on the side of the protrusion away from the cover plate; The single cell includes an electrode assembly disposed on the side of the adapter away from the insulating component; The adapter includes a pole post connection portion and a tab connection portion disposed along a second direction. The pole post connection portion is connected to the third end face, and the tab connection portion is connected to the tab of the electrode assembly. The second direction is perpendicular to the first direction. The pole connection portion includes two first sidewalls that are opposite to the mounting hole along the width direction of the cover plate, and the two first sidewalls are at least partially flush with the sidewall of their respective corresponding protrusions.

4. The single-cell battery according to claim 1, characterized in that, The protrusion is continuously arranged around the mounting hole, and the outer periphery of the projection of the protrusion along the first direction is a square surrounding the mounting hole.

5. The single-cell battery according to claim 1, characterized in that, The cover plate also includes a fixing part connected to the cover plate body, the fixing part extending at least from the second surface along the first direction in a direction away from the cover plate body, such that the fixing part protrudes from the second surface; The insulating component is provided with a recessed portion relative to the third surface, the recessed portion corresponding to the protrusion, and the recessed portion accommodating the portion of the fixing portion that protrudes from the second surface.

6. The single-cell battery according to claim 5, characterized in that, The insulating component includes a sealing ring disposed between the pole post and the fixing part, and the sealing ring protrudes from the fixing part in a direction away from the first surface along the first direction; The groove portion includes a first groove and a second groove, the first groove accommodating the fixing portion and the second groove accommodating the sealing ring.

7. The single-cell battery according to claim 6, characterized in that, The sealing ring abuts against the second groove to form a sealed connection.

8. The single-cell battery according to claim 6, characterized in that, The protrusion includes a first protrusion and a second protrusion. The first protrusion includes a first end face away from the fourth surface, and the second protrusion protrudes from the first end face in a direction away from the cover plate body. The first protrusion corresponds to the position of the first groove, and the second protrusion corresponds to the position of the second groove.

9. The single-cell battery according to claim 8, characterized in that, The protrusion includes a third protrusion, which is disposed along the outer edge of the first end face and protrudes from the first end face in a direction away from the cover plate body; the second protrusion includes a second end face away from the fourth face, and the third protrusion includes a fourth end face away from the fourth face; the pole includes a third end face close to the second face along the first direction; the third end face is located on the side of the protrusion away from the cover plate, and the adapter includes a fifth end face connected to the third end face; along the first direction, the minimum interval distances between the first end face, the second end face, and the fourth end face and the fifth end face are H7, H1, and H3, respectively; H7 > H1 > H3; or, A reinforcing rib connecting the third protrusion and the second protrusion is provided on the first end face.

10. The single-cell battery according to claim 5, characterized in that, The fixing part and the groove part are spaced apart, and along the first direction, the minimum distance between the outer wall of the fixing part and the groove part is H2, 0.05mm≤H2≤0.5mm.

11. The single-cell battery according to claim 5, characterized in that, The surface of the protrusion away from the cover plate is flat, and the bottom of the groove is provided with an annular protrusion that protrudes around the center line of the mounting hole and toward the fixing part. The annular protrusion is arranged in at least one circle along the radial direction of the mounting hole. The annular protrusions may be continuously or intermittently arranged along the circumferential direction; and / or The protrusion height of the annular protrusion is less than the depth of the groove.

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