Battery

Abstract

The utility model provides a battery. The battery comprises a shell; the naked battery cell is arranged in the shell, and the naked battery cell comprises a winding structure; the pole comprises a conductive part, the conductive part is connected to the shell in a sealed and insulated penetrating manner, and the conductive part is provided with a thinning area; the current collecting disc is arranged in the shell and is positioned between the winding structure and the conductive part; the collector plate is welded with the thinning area; wherein the thinning area is provided with a liquid injection hole, the flow collecting disc is provided with a liquid guide hole, and the winding structure is provided with a winding core hole; the orthographic projection of the liquid guide hole in the winding structure is located in the winding core hole, and the orthographic projection of the liquid injection hole in the flow collecting disc does not exceed the liquid guide hole. According to the battery provided by the invention, the orthographic projection of the liquid guide hole in the winding structure is limited to be located in the winding core hole, and the rod-shaped tool penetrating through the winding structure through the winding core hole can abut against the solid part of the current collecting disc, so that the current collecting disc is pushed to move to the conductive part until the current collecting disc is tightly attached to the conductive part.

Description

Technical Field

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

[0002] A cylindrical battery includes a cylindrical casing, one end of which is closed and the other end is open. An electrode post is connected to the closed end of the casing. In related technologies, electrolyte can be injected into the casing through the opening or through an injection hole penetrating the electrode post.

[0003] The applicant discovered that for batteries with electrolyte filling holes on the terminals, the current collectors located inside the casing are typically thin sheet structures. During the welding of the terminals and current collectors, it is difficult to ensure a tight fit between them, resulting in poor weld quality. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a battery that at least partially solves the problem of poor welding quality between the current collector and the terminal post due to the inability to fit them tightly together.

[0005] Based on the above objectives, this application provides a battery, comprising: a housing; a bare cell disposed within the housing, the bare cell including a winding structure; an electrode post including a conductive element, the conductive element being sealed and insulatedly connected through the housing, the conductive element having a thinned region; the through direction of the conductive element being defined as a first direction; a current collector disposed inside the housing and located between the winding structure and the conductive element; the current collector being welded to the thinned region; wherein, the thinned region is provided with an injection hole penetrating the conductive element along the first direction, the current collector is provided with a guide hole penetrating the current collector along the first direction, and the winding structure has a core hole penetrating the winding structure along the first direction; along the first direction, the orthographic projection of the guide hole on the winding structure is located within the core hole, and the orthographic projection of the injection hole on the current collector does not exceed the guide hole.

[0006] Optionally, the diameter of the injection hole is D1, the diameter of the guide hole is D2, and the diameter of the core hole is D3, where D3 > D2 ≥ D1.

[0007] Optional, D3-D2≥1.2mm.

[0008] Optional, D2-D1≥0.9mm.

[0009] Optionally, the thinning zone is circular, with a diameter of D4, where D4-D1≥3mm.

[0010] Optionally, on the surface of the conductive element facing the current collector, at least in the thinned area, a first protrusion is formed, which abuts against the current collector.

[0011] Optionally, the surface of the current collector facing the conductive element is formed with a protruding second protrusion, which abuts against the thinned area.

[0012] Optionally, a third protrusion is provided on the surface of the thinning zone near the manifold and / or away from the manifold. The third protrusion is provided along the edge of the injection hole, and the sidewall of the third protrusion near the injection hole is a continuous surface with the hole wall of the injection hole.

[0013] Optionally, when the third protrusion is located on the surface of the thinning zone near the manifold, the orthogonal projection of the third protrusion onto the manifold is located within the liquid guide hole along the first direction.

[0014] Optionally, the protrusion height of the third protrusion along the first direction is not greater than the thickness of the collector plate.

[0015] As can be seen from the above, the battery provided in this application has an injection hole for electrolyte inflow on the conductive part of the terminal post, and a guide hole for bypassing the injection hole on the current collector, so that electrolyte can be injected into the casing from the terminal post. In order to apply a thrust to the current collector to move it toward the conductive part, a core hole is provided on the winding structure of the bare cell, and the projection of the guide hole along the first direction on the winding structure is defined to be located in the core hole, so that the rod-shaped tool passing through the core hole and the winding structure can abut against the solid part of the current collector, thereby pushing the current collector to move toward the conductive part until the current collector and the conductive part are tightly attached to each other, so as to ensure the welding quality between the current collector and the conductive part, and thus help to improve the electrical performance of the battery. Attached Figure Description

[0016] 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.

[0017] Figure 1 This is a three-dimensional schematic diagram of a battery according to an embodiment of this application;

[0018] Figure 2 for Figure 1 A partial cross-sectional view of the first structure at section AA;

[0019] Figure 3 A schematic diagram showing the movement of the collector plate via a rod-shaped tool;

[0020] Figure 4 for Figure 1 A partial cross-sectional view of the second structure at section AA;

[0021] Figure 5for Figure 1 A partial cross-sectional view of the third structure at section AA;

[0022] Figure 6 for Figure 1 A partial cross-sectional view of the fourth structure at section AA;

[0023] Figure 7 A schematic diagram showing the sealing of the injection hole with adhesive pins;

[0024] Figure 8 for Figure 1 A partial cross-sectional view of the fifth structure at section AA.

[0025] Explanation of reference numerals in the attached figures:

[0026] 100. Shell;

[0027] 200, electrode post; 210, conductive element; 211, thinning zone; 212, injection hole; 213, first protrusion; 214, third protrusion; 220, external fixing part; 230, internal fixing part;

[0028] 300. Bare battery cell; 310. Winding structure; 311. Core hole; 320. Electrode tab;

[0029] 400. Manifold; 410. Liquid guide hole; 420. Second protrusion;

[0030] 500, rod-shaped tooling; 600, adhesive nail. Detailed Implementation

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] Figure 1 A 3D diagram of the battery is shown, such as... Figure 1 This application provides a battery, including a housing 100 and an electrode post 200 connected to the end of the housing 100.

[0037] Specifically, Figure 2 Showing Figure 1 A partial cross-sectional diagram of the first type of structure with section AA, as shown below. Figure 2 The electrode post 200 includes a conductive element 210, which is sealed and insulated through the housing 100. The conductive element 210 has a thinned region 211. The through direction of the conductive element 210 is defined as a first direction (e.g., Figure 2 (Z direction in the middle). The battery also includes a bare cell 300 and a current collector 400. The bare cell 300 is disposed inside the housing 100 and includes a winding structure 310. The current collector 400 is disposed inside the housing 100 and is located between the winding structure 310 and the conductive element 210. The current collector 400 is welded to the thinning area 211.

[0038] For example, the electrode post 200 further includes an outer fixing portion 220 and an inner fixing portion 230. The outer fixing portion 220 is connected to one end of the conductive member 210 located outside the housing 100, and the inner fixing portion 230 is connected to one end of the conductive member 210 located inside the housing 100. The conductive member 210 can be a cylindrical structure, and both the outer fixing portion 220 and the inner fixing portion 230 are annular structures extending from the conductive member 210 radially (perpendicular to the Z direction). The inner fixing portion 230 and the outer fixing portion 220 cooperate to clamp the housing 100, thereby realizing the connection between the conductive member 210 and the housing 100.

[0039] For example, the thinning region 211 is located in the middle of the conductive element 210. The thickness of the thinning region 211 is less than the thickness of other areas of the conductive element 210, so that when the current collector 400 and the conductive element 210 are welded using the laser penetration welding process, the laser can penetrate the thinning region 211 more easily, thus ensuring the welding quality of both.

[0040] For example, a tab 320 is formed at one end of the winding structure 310 near the collector plate 400, and the tab 320 is electrically connected to the pole post 200 through the collector plate 400.

[0041] For example, insulating seals (such as rubber sealing rings) may be provided between the conductive part 210 and the housing 100, between the outer fixing part 220 and the housing 100, and between the inner fixing part 230 and the housing 100 to achieve an insulating and sealed connection between the pole post 200 and the housing 100.

[0042] To allow electrolyte to be injected into the housing 100 through the electrode post 200, the thinning region 211 is provided with an injection hole 212 penetrating the conductive element 210 along a first direction, the current collector 400 is provided with a guiding hole 410 penetrating the current collector 400 along a first direction, and the winding structure 310 has a core hole 311 penetrating the winding structure 310 along a first direction. The electrolyte can enter the housing 100 sequentially through the injection hole 212 and the guiding hole 410, and wet the winding structure 310 during the flow through the core hole 311. At the same time, in order to avoid the current collector 400 blocking the injection hole 212, in the battery of this embodiment, the orthographic projection of the injection hole 212 on the current collector 400 (hereinafter referred to as the injection hole projection) does not exceed the guiding hole 410 along the first direction.

[0043] by Figure 2 Using the structure and orientation shown in the figure as an example, the applicant's research found that in order to make the current collector 400 fit tightly with the conductive element 210 of the pole post 200, a pushing force can be applied to the current collector 400 on the side away from the conductive element 210, that is, the lower side of the current collector 400, to force the current collector 400 to move toward the conductive element 210 until the current collector 400 abuts against the surface of the conductive element 210.

[0044] Figure 3 A schematic diagram showing the drive of the collector plate 400 is provided, as follows: Figure 3 In order to apply a thrust to the collector plate 400, a rod-shaped tool 500 that can pass through the core hole 311 and contact the collector plate 400 can be used to apply a thrust to the collector plate 400 by pushing the rod-shaped tool 500 from bottom to top.

[0045] To achieve the above process, on the one hand, the diameter of the rod-shaped tool 500 needs to be smaller than the core hole 311 so that the rod-shaped tool 500 can pass smoothly through the core hole 311; on the other hand, the rod-shaped tool 500 extending from the core hole 311 and the winding structure 310 needs to be able to abut against the solid portion of the current collector 400 to apply a pushing force to the current collector 400. Therefore, in the battery of this embodiment, along the first direction, the orthographic projection of the liquid guiding hole 410 on the winding structure 310 (hereinafter referred to as the liquid guiding hole projection) is located inside the core hole 311. At this time, the solid portion of the current collector 400 near the edge of the liquid guiding hole 410 is located directly above the core hole 311. After passing through the core hole 311, the rod-shaped tool 500 can abut against the solid portion of the current collector 400, thereby applying a pushing force to the current collector 400 so that the current collector 400 is tightly fitted to the thinned area 211 of the conductive element 210.

[0046] The battery provided in this application embodiment has an injection hole 212 for electrolyte inflow on the conductive part 210 of the electrode 200, and a guide hole 410 for avoiding the injection hole 212 on the collector plate 400, so that electrolyte can be injected into the housing 100 from the electrode 200. In order to apply a thrust to the current collector 400 to move it toward the conductive element 210, a core hole 311 is provided on the winding structure 310 of the bare cell 300, and the liquid guiding hole 410 is defined to be located in the core hole 311 along the first direction in the orthogonal projection of the winding structure 310. This allows the rod-shaped tool 500 passing through the core hole 311 and the winding structure 310 to abut against the solid part of the current collector 400, thereby pushing the current collector 400 toward the conductive element 210 until the current collector 400 and the conductive element 210 are tightly attached. This ensures the welding quality between the current collector 400 and the conductive element 210, thereby helping to improve the electrical performance of the battery.

[0047] like Figure 2 In some embodiments, the diameter of the injection hole 212 is D1, the diameter of the guide hole 410 is D2, and the diameter of the core hole 311 is D3, where D3 > D2 ≥ D1.

[0048] For example, if D1 is too small, the efficiency of injecting electrolyte through injection hole 212 will be low. To avoid the above problem, D1 can be limited to D1≥3mm to ensure injection efficiency.

[0049] For example, if D3 is too large, it will result in low space utilization within the casing 100, leading to low battery energy density. To avoid the above problem, D3 can be limited to D3≤7mm to ensure battery energy density.

[0050] For example, such as Figure 3The diameter of the rod-shaped tool 500 is D5. To ensure that the rod-shaped tool 500 can pass smoothly through the core hole 311 and avoid interference between the rod-shaped tool 500 and the winding structure 310 (such as the diaphragm, positive electrode, and negative electrode in the winding structure 310), the core hole 311 can be hot-stamped or shaped to ensure the roundness of the core hole 311. On the other hand, the relationship between D5 and D3 can be limited to D3-D5≥0.5mm so that the rod-shaped tool 500 inside the core hole 311 can maintain a certain gap with the hole wall of the core hole 311. At the same time, a rounded corner can be provided at the end of the rod-shaped tool 500, and the radius of the rounded corner is not less than 0.15mm.

[0051] To ensure the liquid guiding hole is projected within the core hole 311, this embodiment limits the relationship between D3 and D2 to D3 > D2. This guarantees that the solid portion of the collecting plate 400 is directly above the core hole 311, allowing the rod-shaped tool 500 passing through the core hole 311 to abut against the solid portion of the collecting plate 400, thereby driving the collecting plate 400 to abut against the conductive component 210. Simultaneously, to ensure the injection hole 212 is projected within the liquid guiding hole 410, this embodiment limits the relationship between D2 and D1 to D2 ≥ D1. This prevents the solid portion of the collecting plate 400 from obstructing the injection hole 212, thus improving injection efficiency.

[0052] like Figure 2 In some embodiments, D3-D2 ≥ 1.2 mm.

[0053] If the difference between D2 and D3 is too small, it indicates that the area of ​​overlap between the solid portion of the collector plate 400 and the core hole 311 (i.e., the area of ​​the solid portion of the collector plate 400 located directly above the core hole 311) is too small. Consequently, the contact area between the rod-shaped tool 500 and the solid portion of the collector plate 400 after passing through the core hole 311 is too small, making it difficult to provide sufficient thrust to the collector plate 400.

[0054] To avoid the aforementioned problems, this embodiment limits the difference between D2 and D3 to D3-D2≥1.2mm. This ensures that when the rod-shaped tool 500 abuts against the current collector 400, it has a large contact area with the solid part of the current collector 400, providing effective thrust to the current collector 400 and ensuring a tight fit between the current collector 400 and the conductive component 210. Simultaneously, it also prevents localized deformation of the current collector 400 when pushed by the rod-shaped tool 500, thus avoiding adverse effects on the welding between the current collector 400 and the conductive component 210.

[0055] like Figure 2 In some embodiments, D2-D1 ≥ 0.9 mm.

[0056] Ideally, when the injection hole 212 and the guide hole 410 are concentric, D1 = D2 can ensure that the manifold 400 will not block the injection hole 212.

[0057] However, in actual production, concentricity errors inevitably exist between the winding structure 310, the housing 100, the current collector 400, and the conductive component 210. For example, the concentricity error between the winding structure 310 and the housing 100 is 0.5 mm, the concentricity error between the current collector 400 and the winding structure 310 is 0.2 mm, the concentricity error between the conductive component 210 and the housing 100 is 0.2 mm, and correspondingly, the concentricity error between the conductive component 210 and the current collector 400 is approximately 0.9 mm.

[0058] Considering the aforementioned concentricity error, D2 needs to be designed to be relatively large to ensure that the projection of the injection hole is located within the guide hole 410. Therefore, in this embodiment, the difference between D1 and D2 is limited to D2-D1≥0.9mm, so that, based on the existing machining accuracy, the collector plate 400 will not obstruct the injection hole 212, which helps to ensure the battery's injection efficiency and is suitable for mass production.

[0059] like Figure 2 In some embodiments, the thinning region 211 is circular with a diameter of D4, where D4-D1≥3mm.

[0060] by Figure 2 Taking the structure and orientation shown as an example, when welding the current collector 400 and the conductive element 210, solder marks can be set in the overlapping area between the solid of the current collector 400 and the solid of the thinned area 211. If the area of ​​the overlapping area is too small, it will adversely affect the connection reliability between the current collector 400 and the conductive element 210, and it will also result in a small current flow area between the current collector 400 and the electrode 200, leading to poor current flow capacity.

[0061] Understandable, such as Figure 2 The area of ​​the solid region of the thinning region 211 is positively correlated with the difference between D4 and D1. Therefore, to avoid the above-mentioned problem, while limiting the relationship between D1 and D2, the difference between D1 and D4 can also be limited. Specifically, in this embodiment, the difference between D1 and D4 is limited to D4-D1≥3mm, thereby ensuring that the thinning region 211 has a relatively sufficient solid area, thus ensuring that the overlapping area between the solid of the current collector 400 and the solid of the thinning region 211 is large, ensuring that there is a large current flow area between the current collector 400 and the electrode post 200, and ensuring that the cell has a high current flow capacity.

[0062] Figure 4 Showing Figure 1A partial cross-sectional diagram of the second type of structure at section AA, as shown below. Figure 4 In some embodiments, a first protrusion 213 is formed on the surface of the conductive element 210 facing the collector disk 400, at least in the thinning region 211, and the first protrusion 213 abuts against the collector disk 400.

[0063] For example, the first protrusion 213 can be integrally formed with the conductive element 210 to reduce the molding and assembly difficulty of the pole 200.

[0064] For example, with Figure 4 Taking the structure and orientation shown as an example, the thinned area 211 can be deformed downward to form the first protrusion 213. On the one hand, this can reduce the difficulty and cost of forming the first protrusion 213, and on the other hand, it can also avoid the increase in the thickness of the thinned area 211 due to the setting of the first protrusion 213, which would affect the welding quality between the conductive component 210 and the current collector 400.

[0065] In this embodiment, at least a first protrusion 213 is formed in the thinning region 211. When welding the current collector 400 and the conductive element 210, the current collector 400 and the first protrusion 213 are brought into contact, which can ensure the welding quality of the current collector 400 and the conductive element 210.

[0066] Since the first protrusion 213 has a small area and protrudes from the conductive element 210 towards the surface of the current collector 400, it is easier to achieve a tight fit between the current collector 400 and the first protrusion 213 compared to keeping the current collector 400 in close contact with the surface of the conductive element 210, which has a larger area. This also makes it easier to ensure the welding quality between the current collector 400 and the pole post 200.

[0067] Figure 5 Showing Figure 1 A partial cross-sectional diagram of the third structure in section AA, as shown below. Figure 5 In some embodiments, the surface of the collector 400 facing the conductive element 210 is formed with a protruding second protrusion 420, which abuts against the thinning region 211.

[0068] For example, the second protrusion 420 can be integrally formed with the manifold 400 to reduce the molding and assembly difficulty of the manifold 400.

[0069] For example, with Figure 5Taking the structure and orientation shown as an example, the portion of the collector plate 400 near the liquid guide hole 410 can protrude upwards to form a second protrusion 420. On the one hand, this reduces the difficulty and cost of forming the second protrusion 420; on the other hand, it avoids increasing the thickness of the collector plate 400 due to the setting of the second protrusion 420, which helps to ensure a high space utilization rate inside the housing 100 and helps to ensure the energy density of the battery.

[0070] If the surface of the current collector 400 facing the conductive element 210 is flat, when a pushing force is applied to the current collector 400 by the rod-shaped tool 500, the pushing force will be dispersed from the contact position between the rod-shaped tool 500 and the current collector 400 to the entire current collector 400, which makes it difficult to keep the current collector 400 in close contact with the thinning area 211.

[0071] To avoid the above problems, this embodiment provides a second protrusion 420 on the collector plate 400. When the rod-shaped tool 500 applies a pushing force to the collector plate 400, the pushing force can be concentrated at the location of the second protrusion 420, which makes it easier for the collector plate 400 to keep in close contact with the thinning area 211, thereby improving the welding quality of the collector plate 400 and the pole post 200.

[0072] Figure 6 Showing Figure 1 A partial cross-sectional diagram of the fourth structure in section AA, as shown below. Figure 6 In some embodiments, a protruding third protrusion 214 is provided on the surface of the thinning region 211 near the manifold 400. The third protrusion 214 is provided along the edge of the injection hole 212, and the sidewall of the third protrusion 214 near the injection hole 212 is a continuous surface with the hole wall of the injection hole 212. That is, the inner diameter of the annular structure formed by the third protrusion 214 is the same as the hole diameter of the injection hole 212, and the inner hole of the annular structure is concentric with the injection hole 212.

[0073] The battery manufacturing process requires at least two electrolyte filling processes.

[0074] Figure 7 A schematic diagram showing the sealing of injection hole 212 with adhesive nail 600 is provided, as follows: Figure 7 After the initial electrolyte injection, the injection hole 212 needs to be sealed with adhesive pins 600 to temporarily seal the casing 100. After formation and venting, some electrolyte will be consumed, so the adhesive pins 600 need to be removed and electrolyte re-injected through the injection hole 212 to replenish the electrolyte in the casing 100.

[0075] Combination Figure 2Since the overall thickness of the thinning zone 211 is relatively thin, if the third protrusion 214 is not provided, when the glue nail 600 is inserted into the injection hole 212, the contact area between the hole wall of the injection hole 212 and the glue nail 600 is small, making it difficult to form a reliable sealing structure between the conductive component 210 and the glue nail 600. During the formation process, the sealing of the shell 100 may fail.

[0076] To avoid the aforementioned problems, this embodiment provides a third protrusion 214 in the thinning region 211, and the sidewall of the third protrusion 214 near the injection hole 212 is a continuous surface with the hole wall of the injection hole 212. Figure 7 When the adhesive nail 600 is inserted into the injection hole 212, the surface formed by the side wall of the third protrusion 214 and the hole wall of the injection hole 212 has a large contact area with the adhesive nail 600, so that the adhesive nail 600 can keep the injection hole 212 sealed, and a relatively reliable sealing structure is formed between the adhesive nail 600 and the conductive component 210, ensuring the sealing performance of the housing 100.

[0077] In addition to being configured to protrude into the housing 100, the third protrusion 214 can also be configured to protrude outward from the housing 100.

[0078] Figure 8 Showing Figure 1 A partial sectional view of the fifth structure at section AA, as shown below. Figure 8 In some embodiments, a protruding third protrusion 214 is provided on the surface of the thinning region 211 away from the manifold 400. The third protrusion 214 is provided along the edge of the injection hole 212, and the sidewall of the third protrusion 214 near the injection hole 212 is a continuous surface with the hole wall of the injection hole 212.

[0079] By placing the third protrusion 214 on the surface of the thinning region 211 away from the collector plate 400, interference between the protruding third protrusion 214 and the collector plate 400 can be prevented, and the connection between the collector plate 400 and the conductive element 210 can be avoided due to the placement of the third protrusion 214.

[0080] Other beneficial effects achieved by placing the third protrusion 214 on the surface of the thinning region 211 away from the collector plate 400 are the same as those achieved by placing the third protrusion 214 on the surface of the thinning region 211 near the collector plate 400, and will not be repeated here.

[0081] like Figure 6 In some embodiments, when the third protrusion 214 is disposed on the surface of the thinning region 211 near the manifold 400, the orthogonal projection of the third protrusion 214 on the manifold 400 is located within the liquid guide hole 410 along the first direction.

[0082] For example, the outer diameter D6 of the third protrusion 214 is smaller than the diameter D2 of the liquid guide hole 410, so that the orthogonal projection of the third protrusion 214 along the first direction on the collector plate 400 is located inside the liquid guide hole 410.

[0083] To avoid interference between the third protrusion 214 and the manifold 400, in this embodiment, the third protrusion 214 is confined within the range of the liquid guiding hole 410. When the manifold 400 moves toward the conductive element 210, the third protrusion 214 can pass through the liquid guiding hole 410 to ensure that the manifold 400 can fit tightly with the conductive element 210.

[0084] like Figure 6 In some embodiments, the protrusion height h1 of the third protrusion 214 along the first direction is not greater than the thickness h2 of the collector disk 400.

[0085] If h1 > h2, then when the current collector 400 is pushed by the rod-shaped tool 500, the rod-shaped tool 500 will already be in contact with the third protrusion 214 before the current collector 400 is in contact with the conductive element 210. At this time, the rod-shaped tool 500 can no longer push the current collector 400 to move, and correspondingly, it cannot guarantee that the current collector 400 and the conductive element 210 are in close contact.

[0086] To avoid the above problems, this embodiment limits the relationship between h1 and h2 to h1≤h2. After the collector plate 400 is tightly attached to the conductive component 210, the third protrusion 214 will not pass through the liquid guiding hole 410, and the rod-shaped tool 500 will never contact the third protrusion 214, so as to ensure that the collector plate 400 can be tightly attached to the conductive component 210 under the push of the rod-shaped tool 500.

[0087] It should be noted that some embodiments of this application have been described above. Other embodiments are within the scope of the appended claims.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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 battery, characterized by, The application relates to a battery, comprising: a shell; a bare battery core arranged in the shell, the bare battery core comprising a winding structure; a pole column comprising a conductive piece, the conductive piece being connected to the shell in a penetrating mode in a sealed and insulated mode, the conductive piece having a thinning area; the penetrating direction of the conductive piece is defined as a first direction; a current collecting plate arranged in the shell and located between the winding structure and the conductive piece; the current collecting plate is welded with the thinning area; wherein the thinning area is provided with a liquid injection hole penetrating through the conductive piece along the first direction, the current collecting plate is provided with a liquid guide hole penetrating through the current collecting plate along the first direction, and the winding structure is provided with a winding core hole penetrating through the winding structure along the first direction; along the first direction, the liquid guide hole is located in the winding core hole in the orthographic projection of the winding structure, and the liquid injection hole is not beyond the liquid guide hole in the orthographic projection of the current collecting plate.

2. The battery of claim 1, wherein, The diameter of the liquid injection hole is D1, the diameter of the liquid guide hole is D2, and the diameter of the winding core hole is D3, and D3>D2>=D1.

3. The battery of claim 2, wherein, D3-D2>=1.2mm.

4. The battery of claim 2, wherein, D2-D1>=0.9mm.

5. The battery of claim 2, wherein, The thinning area is circular, the diameter of the circle is D4, and D4-D1>=3mm.

6. The battery of claim 1, wherein, On the surface of the conductive piece facing the current collecting plate, at least the thinning area is formed with a first protrusion, the first protrusion is in abutment with the current collecting plate.

7. The battery according to claim 1 or 6, characterized in that, The surface of the current collecting plate facing the conductive piece is formed with a second protrusion, the second protrusion is in abutment with the thinning area.

8. The battery of claim 1, wherein, The surface of the thinning area close to the current collecting plate and / or the surface of the thinning area away from the current collecting plate is provided with a third protrusion, the third protrusion is arranged along the edge of the liquid injection hole, and the side wall of the third protrusion close to the liquid injection hole is continuous with the hole wall of the liquid injection hole.

9. The battery of claim 8, wherein, When the third protrusion is arranged on the surface of the thinning area close to the current collecting plate, along the first direction, the third protrusion is located in the liquid guide hole in the orthographic projection of the current collecting plate.

10. The battery of claim 9, wherein, The protruding height of the third protrusion along the first direction is not greater than the thickness of the current collecting plate.

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