Battery and battery pack

Abstract

The utility model relates to a battery and a battery pack. The battery comprises a pressing ring, an outer sealing insulating part, a battery shell, an inner sealing insulating part and a battery terminal which are sequentially arranged in a pressing manner, the battery terminal comprises a column section and a plate section, and the column section of the battery terminal sequentially penetrates through the inner sealing insulating part, the battery shell, the outer sealing insulating part and the pressing ring and is riveted with the pressing ring; the plate section of the battery terminal is inclined towards the plate end face of the inner sealing insulating part, and the end, close to the column section, of the plate end face is higher than the end, away from the column section, of the plate end face. In the embodiment of the invention, the existence of the inclined plate end face changes the stress distribution of the battery terminal in the riveting and pressing process. When riveting pressure acts, the plate end face enables stress not to be concentrated on a specific plane or point any more, but to be gradually dispersed along the inclined face. The dispersed stress can reduce the condition of local stress concentration, so that the possibility of deformation of the battery terminal due to overlarge stress is reduced.

Description

Technical Field

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

[0002] It is known that the current industry standard for lithium-ion battery electrode design is to integrally mold the sealing and insulating components with the battery casing. For example, the battery casing is pre-placed in an injection mold, and then the electrodes are formed by pressing / riveting the inner and outer metal parts together. However, during the integral molding process, the battery casing is heated, and stress is released, resulting in significant changes in the flatness of the battery casing, affecting its overall smoothness. Furthermore, the battery casing needs to be molded together with the injection mold, which is relatively large and costly.

[0003] In response to this, another design method exists for lithium-ion battery terminals: the terminal body, sealing insulation, pressure ring, and battery casing are riveted together. However, in practical applications, it has been found that the riveted terminal body undergoes some deformation, requiring improvement. Utility Model Content

[0004] In order to overcome at least one of the defects of the prior art, according to one aspect of the present invention, a battery is provided, comprising a pressure ring, an outer sealing insulation member, a battery shell, an inner sealing insulation member, and battery terminals arranged in sequence by pressing together;

[0005] The battery terminal includes a column segment and a plate segment. The column segment of the battery terminal is sequentially provided with an inner sealing insulation component, a battery shell, an outer sealing insulation component, and a pressure ring, and is riveted to the pressure ring. The plate segment of the battery terminal is inclined towards the plate end face of the inner sealing insulation component.

[0006] In one embodiment of this application, the tilt angle of the end face of the plate segment of the battery terminal is α, and the range of the tilt angle α is: 0°<α≤10°.

[0007] In one embodiment of this application, the inner sealing insulation component includes an inner sealing insulation body and an inner protruding ring, wherein the inner protruding ring passes through the battery casing and the outer sealing insulation component in sequence.

[0008] In one embodiment of this application, the outer sealing insulation member has an outer through hole through which a column segment of the battery terminal passes, and the inner sealing insulation member has an inner through hole through which a column segment of the battery terminal passes, and the walls of the outer through hole and the inner through hole are flush.

[0009] In one embodiment of this application, the battery casing has a through hole through which a column segment of the battery terminal passes, and the battery casing is bent inward at the through hole to form a bent section.

[0010] In one embodiment of this application, the height h1 of the bending segment is in the range of 0.02mm≤h1≤0.15mm.

[0011] In one embodiment of this application, the end face of the pressure ring facing the external sealing insulation has a first annular protrusion.

[0012] In one embodiment of this application, the height h2 of the first annular protrusion is in the range of 0.02mm≤h2≤0.1mm.

[0013] In one embodiment of this application, the end face of the plate segment of the battery terminal facing the inner sealing insulation member has a second annular protrusion.

[0014] In one embodiment of this application, the height h3 of the second annular protrusion is in the range of 0.02mm≤h3≤0.1mm.

[0015] In one embodiment of this application, the height of the plate end face near the column segment is higher than the height of the end away from the column segment.

[0016] According to another aspect of the present invention, a battery pack is also provided, comprising one of the batteries described above.

[0017] In summary, the battery and battery pack provided by this utility model have the following technical effects:

[0018] This design, with its inclined end face, alters the stress distribution of the battery terminals during the riveting and pressing process. When riveting pressure is applied, the end face prevents stress from concentrating on a specific plane or point, dispersing it gradually along the inclined surface. This dispersed stress reduces localized stress concentration, thus lowering the likelihood of deformation of the battery terminals due to excessive stress. Furthermore, the increased contact area between the end face and adjacent components during riveting means less pressure per unit area under the same riveting pressure. Therefore, lower pressure per unit area reduces the degree of deformation of the battery terminals, allowing them to maintain their shape more easily under lower pressure. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a battery according to an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the disassembled state of a battery according to an embodiment of the present invention;

[0021] Figure 3 This is a cross-sectional view of the internal structure of a battery according to an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of a battery according to another embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of the disassembled state of a battery according to another embodiment of the present invention;

[0024] Figure 6 This is a cross-sectional view of the internal structure of a battery according to another embodiment of the present invention;

[0025] Attached Figure: 1-Pressure ring, 11-First annular protrusion, 2-Outer sealing insulation component, 21-Outer through hole, 3-Battery casing, 31-Casing through hole, 32-Bent section, 4-Inner sealing insulation component, 41-Inner sealing insulation body, 42-Inner protruding ring, 43-Inner through hole, 5-Battery terminal, 51-Column section, 52-Plate section, 53-Second annular protrusion, 54-Plate end face. Detailed Implementation

[0026] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0027] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0029] This utility model discloses a battery and a battery pack, wherein the battery can specifically be a cylindrical battery or a prismatic battery. The following description, in conjunction with the accompanying drawings, further details the invention. Figures 1-6 This battery is described in detail.

[0030] In some embodiments, the battery specifically includes a pressure ring 1, an outer sealing insulation member 2, a battery casing 3, an inner sealing insulation member 4, and a battery terminal 5, which are sequentially pressed together. The battery terminal 5 includes a post segment 51 and a plate segment 52. The post segment 51 of the battery terminal 5 passes through the inner sealing insulation member 4, the battery casing 3, the outer sealing insulation member 2, and the pressure ring 1 in sequence, and is riveted to the pressure ring 1. The plate segment 52 of the battery terminal 5 is inclined towards the plate end face 54 of the inner sealing insulation member 4. Specifically, the battery terminal 5 is an aluminum T-shaped connector.

[0031] In this embodiment, the battery is designed with a separate pressure ring 1, an outer sealing insulation component 2, a battery casing 3, an inner sealing insulation component 4, and battery terminals 5. Specifically, the pressure ring 1, the outer sealing insulation component 2, the inner sealing insulation component 4, and the battery terminals 5 are pressed together onto the battery casing 3. The pressing and riveting process is simple, and the tooling fixtures can be easily automated, improving work efficiency. At the same time, during manufacturing, the outer sealing insulation component 2 and the inner sealing insulation component 4 can be injection molded separately, avoiding the impact on the flatness of the battery casing 3 caused by integral molding with it. Furthermore, the mold can be designed according to the specific dimensions of the outer sealing insulation component 2 and the inner sealing insulation component 4, which can effectively reduce costs.

[0032] Related technologies have revealed that the terminal body undergoes certain deformation after riveting and pressing. Research and analysis have shown that because the current riveting equipment is powered by cylinders, the control of riveting pressure and speed is poor. Excessive or excessive riveting pressure can easily exceed the bearing capacity of the terminal body material or cause the terminal body to be subjected to a large impact force in an instant, which cannot evenly distribute the pressure, thus leading to deformation.

[0033] To prevent deformation of the battery terminal 5, this application employs an inclined end face 54 on the plate segment 52 of the battery terminal 5. This inclined end face 54 alters the stress distribution of the battery terminal 5 during the riveting and pressing process. When riveting pressure is applied, the end face 54 causes the stress to gradually disperse along the inclined surface, rather than concentrating on a specific plane or point. This dispersed stress reduces localized stress concentration, thereby lowering the likelihood of deformation of the battery terminal 5 due to excessive stress. Furthermore, when the end face 54 is riveted, it increases the contact area with adjacent components. A larger contact area means less pressure per unit area under the same riveting pressure; therefore, a lower pressure per unit area reduces the degree of deformation of the battery terminal 5, making it easier to maintain its shape under lower pressure.

[0034] It should be noted that the battery terminals formed after pressing can be specifically welded to the tabs of the battery cell by the battery terminal 5 located inside the battery casing 3, and the pressure ring 1 located outside the battery casing 3 can be specifically connected to the external circuit to form a circuit path, so that the battery can work normally.

[0035] The tilting direction of the plate end face 54 can be as follows: for example, the height of the end of the plate end face 54 near the column segment 51 is higher than the height of the end away from the column segment 51, thus forming a downward tilting structure from the inside out. Alternatively, for example, the height of the end of the plate end face 54 near the column segment 51 is lower than the height of the end away from the column segment 51, thus forming an upward tilting structure from the inside out. Both of these tilting structures can effectively reduce the degree of deformation of the battery terminal 5.

[0036] Specifically, the height of the end face 54 near the column segment 51 is higher than the height of the end away from the column segment 51, forming a downward sloping structure from the inside out. Since the column segment 51 is located in the middle of the plate segment 52, such an sloping structure will give the battery terminal 5 better mechanical strength in a specific direction, enabling it to withstand certain external impacts without being easily damaged.

[0037] In some embodiments, the tilt angle of the end face 54 of the plate segment 52 of the battery terminal 5 is α, and the range of the tilt angle α is 0° < α ≤ 10°. It should be noted that the tilt angle α of the end face 54 of the plate segment 52 of the battery terminal 5 is specifically the tilt angle between the end face and the horizontal plane when the battery is placed upright. Specifically, the tilt angle α can be 1°, 2°, 3°, 4°, 5°, 6°, 7°, 8°, 9°, or 10°. Of course, in some other embodiments, the tilt angle α can also be other values ​​within the range of 0° < α ≤ 10°. In multiple research and development experiments, it was found that controlling the tilt angle α of the end face 54 of the plate segment 52 of the battery terminal 5 within 0° < α ≤ 10° can effectively prevent deformation of the battery terminal 5.

[0038] In some embodiments, the inner sealing insulation member 4 includes an inner sealing insulation body 41 and an inner protruding ring 42, the inner protruding ring 42 passing through the battery housing 3 and the outer sealing insulation member 2 in sequence. In this embodiment, when the pressure ring 1, the outer sealing insulation member 2, the inner sealing insulation member 4 and the battery terminal 5 are pressed together onto the battery housing 3, the inner protruding ring 42 of the inner sealing insulation member 4 passes through the battery housing 3 and the outer sealing insulation member 2. During the pressing and riveting process, the inner protruding ring 42 of the inner sealing insulation member 4 is compressed and deformed, and a seal is formed by the riveting of the battery terminal 5 and the pressure ring 1, thereby improving the sealing performance.

[0039] In some embodiments, the outer sealing insulation member 2 has an outer through hole 21 through which the column segment 51 of the battery terminal 5 passes, and the inner sealing insulation member 4 has an inner through hole 43 through which the column segment 51 of the battery terminal 5 passes. The walls of the outer through hole 21 and the inner through hole 43 are flush. In this embodiment, unlike the embodiments described above, the outer through hole 21 of the outer sealing insulation member 2 and the inner through hole 43 of the inner sealing insulation member 4 are flush. During the pressing and riveting process, both the outer sealing insulation member 2 and the inner sealing insulation member 4 are subjected to compression deformation, and a seal is formed by the riveting of the battery terminal 5 to the pressure ring 1 to improve the sealing performance.

[0040] In some embodiments, the battery casing 3 has a casing through hole 31 through which the column segment 51 of the battery terminal 5 passes, and the battery casing 3 is bent inward at the casing through hole 31 to form a bent section 32. In this embodiment, the bent section 32 is formed by bending inward at the casing through hole 31. After pressing and riveting, this is equivalent to increasing the contact area between the battery casing 3 and the inner sealing insulation member 4, and also increasing the sealing path, which can effectively improve the overall sealing performance.

[0041] In one specific embodiment, the height h1 of the bending section 32 is in the range of 0.02mm ≤ h1 ≤ 0.15mm. Specifically, the height h1 of the bending section 32 can be 0.02mm, 0.05mm, 0.08mm, 0.11mm, 0.14mm, or 0.15mm. Of course, in other embodiments, the height h1 of the bending section 32 can also be other values ​​within the range of 0.02mm ≤ h1 ≤ 0.15mm. Multiple research and development tests have shown that controlling the height h1 of the bending section 32 within 0.02mm ≤ h1 ≤ 0.15mm results in good overall sealing performance after press-fitting and riveting, while also preventing the inner sealing insulation component 4 from breaking during press-fitting. Furthermore, as the height h1 of the bending section 32 exceeds 0.15mm, the inner sealing insulation component 4 is easily crushed and broken by the bending section 32, thus failing to form a good sealing structure. Therefore, the height h1 of the bending section 32 is set within the range of 0.02mm≤h1≤0.15mm.

[0042] In some embodiments, the end face of the pressure ring 1 facing the outer sealing insulation member 2 has a first annular protrusion 11. After pressing and riveting, it is equivalent to increasing the contact area between the pressure ring 1 and the outer sealing insulation member 2, and also increasing the sealing path, which can effectively improve the overall sealing performance.

[0043] In one specific embodiment, the height h2 of the first annular protrusion 11 is in the range of 0.02mm ≤ h2 ≤ 0.1mm. Specifically, the height h2 of the first annular protrusion 11 can be 0.02mm, 0.04mm, 0.06mm, 0.08mm, or 0.1mm. Of course, in some other embodiments, the height h2 of the first annular protrusion 11 can also be other values ​​within the range of 0.02mm ≤ h2 ≤ 0.1mm. Multiple research and development tests have shown that controlling the height h2 of the first annular protrusion 11 within 0.02mm ≤ h2 ≤ 0.1mm results in good overall sealing performance after press-fitting and riveting, while also preventing the outer sealing insulation component 2 from breaking during press-fitting.

[0044] Specifically, the shape of the first annular protrusion 11 can be circular, elliptical, or square.

[0045] In some embodiments, the plate segment 52 of the battery terminal 5 has a second annular protrusion 53 facing the plate end face 54 of the inner sealing insulation member 4. After press-fitting and riveting, the increased contact area between the plate segment 52 of the battery terminal 5 and the inner sealing insulation member 4, as well as the increased sealing path, effectively improves the overall sealing performance.

[0046] In one specific embodiment, the height h3 of the second annular protrusion 53 is in the range of 0.02mm ≤ h3 ≤ 0.1mm. Specifically, the height h3 of the second annular protrusion 53 can be 0.02mm, 0.04mm, 0.06mm, 0.08mm, or 0.1mm. Of course, in other embodiments, the height h3 of the second annular protrusion 53 can also be other values ​​within the range of 0.02mm ≤ h3 ≤ 0.1mm. Multiple research and development tests have shown that controlling the height h3 of the second annular protrusion 53 within 0.02mm ≤ h3 ≤ 0.1mm results in good overall sealing performance after press-fitting and riveting, while also preventing the inner sealing insulation component 4 from breaking during press-fitting.

[0047] Specifically, the shape of the second annular protrusion 53 can be circular, elliptical, or square.

[0048] More importantly, whether the inner sealing insulation component 4 will break during the pressing and riveting process depends on two factors: the height h1 of the bending section 32 and the height h3 of the second annular protrusion 53. Since the bending section 32 and the second annular protrusion 53 act on the inner sealing insulation component 4 simultaneously, after multiple studies, it has been found that controlling the height h1 of the bending section 32 within 0.02mm≤h1≤0.15mm and the height h3 of the second annular protrusion 53 within 0.02mm≤h3≤0.1mm can effectively ensure the good sealing performance of the overall structure after pressing and riveting, while also preventing the inner sealing insulation component 4 from breaking during pressing.

[0049] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A battery, characterized in that, It includes a pressure ring (1), an outer sealing insulation component (2), a battery casing (3), an inner sealing insulation component (4), and battery terminals (5) that are pressed together in sequence; The battery terminal (5) includes a column segment (51) and a plate segment (52). The column segment (51) of the battery terminal (5) is sequentially provided with an inner sealing insulation member (4), a battery shell (3), an outer sealing insulation member (2) and a pressure ring (1), and is riveted to the pressure ring (1). The plate segment (52) of the battery terminal (5) is inclined to face the plate end face (54) of the inner sealing insulation member (4).

2. The battery according to claim 1, characterized in that, The tilt angle of the end face (54) of the plate segment (52) of the battery terminal (5) is α, and the range of the tilt angle α is: 0°<α≤10°.

3. A battery according to claim 1 or 2, characterized in that, The inner sealing insulation component (4) includes an inner sealing insulation body (41) and an inner protruding ring (42), the inner protruding ring (42) passing through the battery shell (3) and the outer sealing insulation component (2) in sequence.

4. A battery according to claim 1 or 2, characterized in that, The outer sealing insulation member (2) has an outer through hole (21) through which the column segment (51) of the battery terminal (5) passes, and the inner sealing insulation member (4) has an inner through hole (43) through which the column segment (51) of the battery terminal (5) passes. The walls of the outer through hole (21) and the inner through hole (43) are flush.

5. A battery according to claim 1 or 2, characterized in that, The battery casing (3) has a casing through hole (31) through which the column section (51) of the battery terminal (5) passes, and the battery casing (3) is bent inward at the casing through hole (31) to form a bent section (32).

6. A battery according to claim 5, characterized in that, The height h1 of the bending section (32) is in the range of 0.02mm≤h1≤0.15mm.

7. A battery according to claim 1 or 2, characterized in that, The end face of the pressure ring (1) facing the external sealing insulation member (2) has a first annular protrusion (11).

8. A battery according to claim 7, characterized in that, The height h2 of the first annular protrusion (11) is in the range of 0.02mm≤h2≤0.1mm.

9. A battery according to claim 1, 2, 6 or 8, characterized in that, The plate segment (52) of the battery terminal (5) has a second annular protrusion (53) facing the plate end face (54) of the inner sealing insulation member (4).

10. A battery according to claim 9, characterized in that, The height h3 of the second annular protrusion (53) is in the range of 0.02mm≤h3≤0.1mm.

11. A battery according to claim 1, 2, 6, 8 or 10, characterized in that, The height of the end face (54) of the plate near the column segment (51) is higher than the height of the end away from the column segment (51).

12. A battery pack, characterized in that, Includes a battery according to any one of claims 1-11.

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