A type of battery

Abstract

This application relates to the field of battery technology, and particularly to a battery. The battery includes a casing, a cover plate, and terminals. The casing and cover plate form a cavity. The cover plate has a first through hole. The terminals include a main body structure and a stepped structure, which are integrally formed. A portion of the main body structure is located within the cavity and passes through the first through hole. The stepped structure protrudes from the cover plate. The stepped structure includes a first stepped portion and a second stepped portion. The second stepped portion is located between the main body structure and the first stepped portion and abuts against the cover plate. The maximum radial dimension of the first stepped portion is d1, the maximum radial dimension of the second stepped portion is d2, and the maximum radial dimension of the main body structure is d3, wherein d1 < d3 < d2, and 0.9 ≤ d1 / d3 ≤ 0.98. This battery limits the d1 / d2 ratio to between 0.9 and 0.98, ensuring sufficient connection strength between the terminals and the cover plate, while also providing suitable current flow.

Description

Technical Field

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

[0002] Battery terminals are key components connecting the battery to external circuits, responsible for conducting charging and discharging current. The performance of the terminals, especially their overcurrent capacity, directly affects the battery's power output, energy efficiency, thermal management, lifespan, and the safety and reliability of the entire battery system.

[0003] Currently, terminals are typically fixed to the battery casing by welding or screwing. While welding creates a very strong physical connection, the welding process can introduce tiny pores or unfused areas, which can become weak points in current transmission, increasing local resistance and heat generation. Furthermore, the welding process itself can have a thermal impact on the battery casing or internal structure, affecting material properties. Screwing requires pre-machining threaded holes in the battery casing before tightening the threaded terminal. The conductive area of ​​threaded connections is relatively limited, potentially becoming a current bottleneck. Both of these installation methods, while achieving a connection between the terminal and the battery casing, may introduce additional resistance and potential weak points at the connection interface, making it impossible to simultaneously achieve good connection strength between the terminal and the casing and good current-carrying capacity of the terminal. Utility Model Content

[0004] This application discloses a battery in which the battery terminals and the casing have good connection strength and the terminals have good current carrying capacity.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] In a first aspect, this application provides a battery comprising a casing, a cover plate, and terminals. The casing and cover plate enclose a cavity. The cover plate has a first through hole. The terminals include a main body structure and a stepped structure, which are integrally formed. A portion of the main body structure is located within the cavity and passes through the first through hole. The stepped structure protrudes from the cover plate. The stepped structure includes a first stepped portion and a second stepped portion. The second stepped portion is located between the main body structure and the first stepped portion and abuts against the cover plate. The maximum radial dimension of the first stepped portion is d1, the maximum radial dimension of the second stepped portion is d2, and the maximum radial dimension of the main body structure is d3, wherein d1 < d3 < d2, and 0.9 ≤ d1 / d3 ≤ 0.98.

[0007] In the battery provided in this application, the portion of the terminal post that protrudes from the cover plate after passing through the first through hole is riveted to form a stepped structure. This stepped structure includes a first stepped portion and a second stepped portion. The maximum radial dimension of the first stepped portion is d1, and the maximum radial dimension of the main structure is d3. If the ratio of d1 / d3 is too large, it indicates that the volume of the stepped structure is too small, resulting in insufficient connection strength between the stepped structure and the cover plate, i.e., insufficient connection strength between the terminal post and the cover plate. Conversely, if the ratio of d1 / d3 is too small, it indicates that the current-carrying area of ​​the terminal post is too small, resulting in poor current-carrying performance. In the battery of this application, the ratio of d1 / d3 is limited to between 0.9 and 0.98, which ensures sufficient connection strength between the terminal post and the cover plate, while also providing a suitable current-carrying effect. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of a battery according to one embodiment of this application;

[0009] Figure 2 This is a top view of a battery according to one embodiment of this application;

[0010] Figure 3 This is a cross-sectional view of a battery according to an embodiment of this application;

[0011] Figure 4 for Figure 3 A magnified view of a portion at point A shown in the diagram.

[0012] Reference numerals: 100-Shell; 200-Cover plate; 300-Pole post; 310-Main structure; 320-Stepped structure; 321-First step section; 322-Second step section; 301-Positive pole post; 302-Negative pole post; 400-Top plate; 500-Insulation assembly; 510-First insulating component; 520-Second insulating component; 530-Third insulating component; 600-Sealing component. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description of the application is provided in conjunction with the accompanying drawings and embodiments.

[0014] The terminology used in the following embodiments is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “an,” “the,” “the,” “the,” and “this” are intended to also include expressions such as “one or more” unless the context clearly indicates otherwise.

[0015] References to “an embodiment” or “a specific embodiment” as used in this specification mean that one or more embodiments of this application include a particular feature, structure, or characteristic described in connection with that embodiment. The terms “comprising,” “including,” “having,” and variations thereof mean “including, but not limited to,” unless otherwise specifically emphasized.

[0016] Figure 1 This is a schematic diagram of the structure of a battery according to one embodiment of this application. Figure 2 This is a top view of a battery according to one embodiment of this application. Figure 3 This is a cross-sectional view of a battery according to one embodiment of this application. Figure 4 for Figure 3 Please refer to the enlarged view of point A shown in the image. Figures 1 to 4 This application provides a battery comprising a casing 100, a battery cell, an electrolyte, a cover plate 200, and terminals 300. The casing 100 has an opening on one side, and the cover plate is welded to the opening of the casing 100 to form a sealed chamber for accommodating the battery cell and electrolyte. Optionally, the casing 100 and / or the cover plate 200 are provided with pressure relief components to burst open when the internal pressure of the chamber reaches a certain level.

[0017] The electrode post 300 can be disposed on the housing 100 and / or the cover plate 200. For example, the electrode post 300 can be disposed on the cover plate 200. Specifically, the cover plate 200 has a first through hole. The electrode post 300 includes a main structure 310 and a stepped structure 320, which are integrally formed. A portion of the main structure 310 is located within the cavity and passes through the first through hole. The stepped structure 320 protrudes from the cover plate 200. The stepped structure 320 includes a first stepped portion 321 and a second stepped portion 322. The second stepped portion 322 is located between the main structure 310 and the first stepped portion 321 and abuts against the cover plate 200. The maximum radial dimension of the first stepped portion 321 is d1, the maximum radial dimension of the second stepped portion 322 is d2, and the maximum radial dimension of the main structure 310 is d3, wherein d1 < d3 < d2, and 0.9 ≤ d1 / d3 ≤ 0.98.

[0018] For example, the value of d1 / d3 can be 0.9, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98 or any other value between 0.9 and 0.98.

[0019] The battery in this application may be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., but this embodiment is not limited to this.

[0020] In one specific embodiment, the portion of the terminal post 300 protruding from the cover plate 200 is riveted to form the aforementioned stepped structure 320, thereby fixing the terminal post 300 to the cover plate 200. Furthermore, when the ratio of d1 / d3 satisfies 0.9 ≤ d1 / d3 ≤ 0.98, it not only ensures a high connection strength between the terminal post 300 and the cover plate 200 to effectively resist stresses caused by vibration, impact, and thermal expansion and contraction, preventing the terminal post 300 from loosening or falling off, but also ensures a large cross-sectional area for the first stepped portion 321, providing sufficient current-carrying area for the terminal post 300, thus guaranteeing its current-carrying capacity and enabling the battery to have good power output and reliable safety.

[0021] The outer edge of the end face of the first step 321 away from the cover plate 200 is circumferentially racetrack-shaped or circular.

[0022] It is understandable that when the circumferential outer edge of the end face of the first step portion 321 away from the cover plate 200 is racetrack-shaped, the maximum radial dimension of the first step portion 321 refers to the dimension of the major axis of the end face of the first step portion 321 away from the cover plate 200. When the circumferential outer edge of the end face of the first step portion 321 away from the cover plate 200 is circular, the maximum radial dimension of the first step portion 321 refers to the diameter of the end face of the first step portion 321 away from the cover plate 200.

[0023] Understandably, the shape of the second step portion 322 matches the shape of the first step portion 321. Specifically, when the outer circumferential edge of the end face of the first step portion 321 away from the cover plate 200 is racetrack-shaped, the outer circumferential edge of the end face of the second step portion 322 away from the cover plate 200 is also racetrack-shaped. The maximum radial dimension of the second step portion 322 refers to the dimension of the major axis of the end face of the second step portion 322 away from the cover plate 200. When the outer circumferential edge of the end face of the first step portion 321 away from the cover plate 200 is round, the outer circumferential edge of the end face of the second step portion 322 away from the cover plate 200 is also round. The maximum radial dimension of the second step portion 322 refers to the diameter of the end face of the second step portion 322 away from the cover plate 200.

[0024] In one specific embodiment, 4.5mm ≤ d1 ≤ 54.5mm. For example, the value of d1 can be 4.5mm, 11.5mm, 18.5mm, 25.5mm, 32.5mm, 39.5mm, 45.5mm, 50.5mm, 54.5mm or any other value between 4.5 and 54.5mm.

[0025] In one specific embodiment, 5mm ≤ d3 ≤ 55mm. For example, the value of d3 can be 5mm, 12mm, 19mm, 26mm, 33mm, 40mm, 47mm, 52mm, 55mm or any other value between 5 and 55mm.

[0026] Reference Figure 4 Along the radial direction of the pole post 300, the edge of the second step portion 322 extends beyond the first step portion 321 to form an annular flange, the radial dimension of which is L, wherein 1mm≤L≤10mm. For example, L can be 1mm, 2mm, 3mm, 4mm, 5mm, 7mm, 8mm, 9mm, 10mm or any other value between 1 and 10mm.

[0027] In one specific embodiment, 0.05 ≤ L / d1 ≤ 0.5. For example, L / d1 can be 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.5 or any other value between 0.05 and 0.5.

[0028] When L / d1 is too large, the heat dissipation effect of the pole 300 is poor, and the temperature of the pole 300 will increase, which will reduce the current carrying capacity of the pole 300; conversely, when L / d1 is too small, the connection strength between the pole 300 and the cover plate 200 will decrease.

[0029] In one specific embodiment, the cross-section of the annular flange is S1, and the absolute value of the difference between the cross-section S1 of the annular flange and the cross-section S2 of the second step is less than or equal to 60 square millimeters. If the absolute value of the difference between S1 and S2 is too large, when the pole post 300 is under long-term vibration conditions, a large interaction force will be generated between the annular flange, the cover plate 200, and the second step 322, which can easily cause deformation of the component with a smaller cross-sectional area, that is, the annular flange or the second step 322 is prone to warping, thereby reducing the insulation and sealing effect.

[0030] In one specific embodiment, the radial dimension of the orthographic projection of the annular flange onto the cover plate along the pole post is 2-10 mm. For example, the radial dimension of the orthographic projection of the annular flange onto the cover plate along the pole post can be 2 mm, 3 mm, 4 mm, 5 mm, 7 mm, 8 mm, 9 mm, 10 mm, or any other value between 2 and 10 mm. The radial dimension of the annular flange cannot be too large, as this will reduce the current-carrying effect of the pole post 300. Simultaneously, the radial dimension of the annular flange cannot be too small, as this will result in insufficient connection strength between the pole post 300 and the cover plate 200.

[0031] In one specific embodiment, along the radial direction of the pole post 300, the distance between the edge of the first step portion 321 and the "weld mark" on the end face of the first step portion 321 away from the cover plate 200 is M, where 1mm ≤ M ≤ 3mm. For example, M can be 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.3mm, 2.5mm, 2.8mm, 3mm, or any other value between 1 and 3mm.

[0032] The value of L / M satisfies 1≤L / M≤5. When the value of L / M is too large, the edge of the stepped structure 320 is prone to warping; conversely, when the value of L / M is too small, the solder area is too small, resulting in poor current flow performance of the pole 300.

[0033] The “weld mark” refers to the area on the end face of the first step 321 away from the cover plate 200 that has been welded and left with visible traces or a change in state. It is also the start or end point of the external electrical connection of the battery.

[0034] In one specific embodiment, the battery includes a cell disposed within a cavity and electrically connected to terminals 300. Terminals 300 may include a positive terminal 301 and a negative terminal 302, wherein the positive terminal 301 and the negative terminal 302 may be located on the same side of the cell, or the positive terminal 301 and the negative terminal 302 may be located on different sides of the cell.

[0035] In one specific embodiment, the battery includes a cell body and tabs. The cell body includes one or more electrode assemblies, which are formed by stacking or winding positive electrode plates, negative electrode plates, and separators. The separator is located between adjacent positive and negative electrode plates to insulate them. Tabs extend from at least one end or edge of the electrode assembly.

[0036] The electrode tabs may include positive electrode tabs and negative electrode tabs. The positive electrode tabs and negative electrode tabs may be located on the same side of the cell body, or the positive electrode tabs and negative electrode tabs may be located on different sides of the cell body.

[0037] It is understandable that the positive electrode tab is electrically connected to the positive electrode post 301, and the negative electrode tab is electrically connected to the negative electrode post 302.

[0038] In one alternative embodiment, the end or edge of the tab furthest from the cell body is directly connected to the terminal post 300 to improve the space utilization inside the battery, thereby reducing resistance and improving the battery's overcurrent capacity.

[0039] In other optional embodiments of this application, the end or edge of the tab away from the cell body is connected to the terminal post 300 via an adapter piece. Specifically, one end of the adapter piece is electrically connected to the tab, and the other end of the adapter piece is electrically connected to the terminal post 300. Optionally, the adapter piece is connected to both the tab and the terminal post 300 by welding.

[0040] The tabs can be located at the end along the height of the cell body or at the end along the maximum radial dimension of the cell body, depending on the actual needs.

[0041] In one specific embodiment, an insulating component 500 is provided between the terminal post 300 and the cover plate 200 to prevent electrical connection between the terminal post 300 and the cover plate 200, which could lead to a short circuit inside the battery.

[0042] In one specific embodiment, the insulating assembly 500 may include a first insulating member 510 and a second insulating member 520. Along the height direction of the pole post 300, the first insulating member 510 is disposed between the cover plate 200 and the second step portion 322 to provide insulation between the cover plate 200 and the second step portion 322. Along the radial direction of the pole post 300, the second insulating member 520 is disposed between the cover plate 200 and the main body structure 310 to provide insulation between the cover plate 200 and the main body structure 310. Specifically, the second insulating member 520 is disposed between the inner wall of the first through hole and the main body structure 310.

[0043] Optionally, the first insulating member 510 and the second insulating member 520 form an L-shaped structure. The first insulating member 510 and the second insulating member 520 can be an integral structure or a separate structure, depending on the actual needs.

[0044] In one specific embodiment, the battery further includes a top plate 400 disposed on the side of the cover plate 200 opposite to the cell. The insulating assembly 500 may include a third insulating member 530 disposed radially between the stepped structure 320 and the top plate 400 along the radial direction of the terminal post 300, thereby providing insulation between the stepped structure 320 and the top plate 400.

[0045] The top plate 400 can be made of insulating material. It is understood that when the top plate 400 is an insulating plate, there is no need to set an additional third insulating component 530 between the top plate 400 and the stepped structure 320.

[0046] Continue to refer to Figure 4 The battery may also include a seal 600, which is disposed between the terminal post 300 and the cover plate 200, and at least a portion of the seal 600 extends into the first through hole to maintain a sealed environment in the chamber and prevent gas or liquid leakage from the chamber.

[0047] Obviously, those skilled in the art can make various modifications and variations to the embodiments of this application without departing from the spirit and scope of this application. Therefore, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application also intends to include these modifications and variations.

Claims

1. A battery, characterized by, The battery includes a casing, a cover plate, and terminals. The casing and the cover plate form a cavity. The cover plate has a first through hole. The terminals include a main structure and a stepped structure. The main structure and the stepped structure are integrally formed. A portion of the main structure is located within the cavity and passes through the first through hole. The stepped structure protrudes from the cover plate. The stepped structure includes a first stepped portion and a second stepped portion. The second stepped portion is located between the main structure and the first stepped portion and abuts against the cover plate. The maximum radial dimension of the first stepped portion is d1, the maximum radial dimension of the second stepped portion is d2, and the maximum radial dimension of the main structure is d3, wherein d1 < d3 < d2, and 0.9 ≤ d1 / d3 ≤ 0.

98.

2. The battery according to claim 1, characterized in that, 4.5mm≤d1≤54.5mm, 5mm≤d3≤55mm.

3. The battery of claim 1, wherein, Along the radial direction of the pole post, the edge of the second step portion extends beyond the first step portion to form an annular flange, the radial dimension of which is L; Where 1mm≤L≤10mm; and / or, 0.05≤L / d1≤0.

5.

4. The battery of claim 3, wherein, The orthographic projection of the annular flange onto the cover plate along the radial direction of the pole post is 2-10 mm; and / or, The absolute value of the difference between the cross-sectional area of ​​the annular flange and the cross-sectional area of ​​the second step is less than or equal to 60 square millimeters.

5. The battery according to any one of claims 1 to 4, characterized in that, The battery includes a cell, and the terminals include a positive terminal and a negative terminal, with the cell disposed within the cavity; The positive terminal and the negative terminal are located on the same side of the battery cell, or the positive terminal and the negative terminal are located on different sides of the battery cell.

6. The battery of claim 5, wherein, The battery includes a cell body and electrodes, one end of which is connected to the end or edge of the cell body; wherein, The other end of the electrode tab is directly connected to the electrode post, or the other end of the electrode tab is connected to the electrode post via an adapter piece.

7. The battery according to any one of claims 1 to 4, wherein Along the radial direction of the pole post, the distance between the edge of the first step portion and the weld mark on the end face of the first step portion away from the cover plate is M, where 1mm≤M≤3mm.

8. The battery according to claim 7, characterized in that, An insulating assembly is provided between the pole post and the cover plate. The insulating assembly includes a first insulating member and a second insulating member. Along the height direction of the pole post, the first insulating member is disposed between the cover plate and the second step portion. Along the radial direction of the pole post, the second insulating member is disposed between the cover plate and the main structure.

9. The battery of claim 8, wherein, The first insulating component and the second insulating component are either an integral structure or a separate structure.

10. The battery of any one of claims 1-4, wherein, The outer circumferential edge of the end face of the first step portion away from the cover plate is racetrack-shaped or circular.

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