Lithium ion battery

Abstract

The utility model discloses a lithium ion battery, which relates to the technical field of batteries and comprises a shell and a core body arranged in an inner cavity of the shell, a sealing plate is fixed at an opening at one end of the shell, an end cover is arranged at an opening at the other end of the shell, and a positive terminal and a negative terminal of the core body extend out of the sealing plate. An exhaust hole communicated with an inner cavity of the shell is formed in the shell, the sealing plate or the end cover, and an exhaust assembly is arranged on the exhaust hole; the valve further comprises an adjusting assembly, and the adjusting assembly corresponds to the exhaust assembly and can adjust the minimum opening pressure of the exhaust assembly. The lithium ion battery disclosed by the utility model can be prevented from exploding.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a lithium-ion battery. Background Art

[0002] A lithium-ion battery includes a core body and a housing for containing the core body. The core body includes a positive electrode material, a negative electrode material, a separator, an electrolyte, etc. The housing is usually a sealed shell to prevent water, salt spray, etc.

[0003] If a lithium-ion battery is used improperly, it is prone to danger, such as overcharging, over-discharging or short-circuiting, etc. At this time, the electrolyte is thermally decomposed to generate gas, and the internal air pressure of the housing increases. In the light case, a bulging phenomenon occurs, and in the serious case, an explosion occurs. The explosion will pose a danger to people's lives, health and property.

[0004] The patent with publication number CN117878520A discloses a double-head top-sealing structure of a lithium battery, including a first top seal and a second top seal. An explosion-proof square tube is arranged on the outer wall of one side of the first top seal, and a guide rod is arranged on the inner wall of the explosion-proof square tube. A moving plate is slidably sleeved outside the guide rod. A compression spring connected to the moving plate is arranged on the inner wall of one side of the explosion-proof square tube, and the compression spring is sleeved outside the guide rod. A sealing plug is arranged on the outer wall of one side of the moving plate. A baffle is arranged on the inner wall of the explosion-proof square tube, and a ventilation hole is opened in the baffle. The sealing plug is clamped inside the ventilation hole. An exhaust hole is opened in the moving plate, and a connecting rod is integrally connected to the outer wall of one side of the moving plate. The other end of the connecting rod away from the moving plate is integrally connected with a waterproof cover. A circular ring groove is opened on the outer wall of one side of the explosion-proof square tube, and the waterproof cover is clamped inside the circular ring groove.

[0005] In the above patent, when the lithium battery is overcharged or over-discharged, a large amount of heat and gas will be released, the internal air pressure increases, and the gas pushes the sealing plug, the moving plate, the connecting rod and the waterproof cover to move. At this time, the sealing plug moves out from the inside of the ventilation hole, and at this time, the ventilation hole and the exhaust hole are in an open state, and the gas is discharged through the ventilation hole, the exhaust hole and the waterproof cover, avoiding the continuous expansion and explosion inside the soft-pack lithium battery and improving the safety performance. The inventor believes that: the distance between the explosion-proof square tube and the moving plate is a fixed value, so the compression spring cannot be adjusted, and the minimum pressure value required for the ventilation hole to open is a fixed value. Users cannot adjust the minimum opening pressure value of the ventilation hole according to their own needs, which has limitations. That is, after a period of use, due to the housing repeatedly bearing pressure and its own aging and other reasons, its strength will decrease. At this time, it is necessary to adjust the minimum opening pressure value of the ventilation hole to avoid the housing cracking before reaching the minimum opening pressure value.

[0006] Therefore, it is necessary to develop a lithium-ion battery for the above-mentioned defects. Utility Model Content

[0007] The purpose of the present utility model is to provide a lithium-ion battery that can prevent the lithium-ion battery from exploding.

[0008] To solve the above technical problems, the present utility model adopts the following technical solutions:

[0009] A lithium-ion battery of the present utility model includes a housing, a core body disposed in the inner cavity of the housing, a sealing plate fixed to the opening at one end of the housing, an end cap disposed at the opening at the other end of the housing, the positive and negative terminals of the core body protruding from the sealing plate, an exhaust hole communicating with the inner cavity of the housing is provided on the housing, the sealing plate or the end cap, and an exhaust component is provided on the exhaust hole; further includes an adjusting component, the adjusting component is correspondingly disposed with the exhaust component and can adjust the minimum opening pressure of the exhaust component.

[0010] Further, the exhaust component includes a first plate body, a compression spring and a fixing rod, the first plate body is slidably connected in the exhaust hole, the first plate body is located at one end of the exhaust hole close to the inner cavity of the housing, one side of the first plate body away from the inner cavity of the housing is fixedly connected to one end of the fixing rod, the other end of the fixing rod is fixedly connected to a second plate body, and the top end of the second plate body is slidably matched with the exhaust hole; a ventilation hole is provided on one side of the first plate body close to the inner cavity of the housing and the ventilation hole penetrates through the other side of the first plate body; a convex ring is coaxially fixed to the bottom end of the second plate body, and a first sealing ring is provided between the convex ring and the outer wall for opening the exhaust hole; the adjusting component is fixedly connected to the outer wall for opening the exhaust hole, and the compression spring is disposed between the second plate body and the adjusting component.

[0011] Further, the adjusting component includes a screw rod and a sliding plate, there are two screw rods, and one ends of the two screw rods are respectively fixedly connected to the outer wall for opening the exhaust hole, one end of the compression spring is fixedly connected to one side of the second plate body, the other end of the compression spring is fixedly connected to one side of the sliding plate, the two screw rods respectively slidably penetrate through both ends of the sliding plate, and a nut is threadedly connected to the screw rod, and one side of the sliding plate away from the compression spring abuts against the nut.

[0012] Further, it also includes a lock nut, the lock nut is threadedly connected to the screw rod, and one end of the nut away from the sliding plate abuts against the lock nut.

[0013] Further, a second sealing ring is provided between the end cap and the housing, and the end cap and the housing are detachably connected by screws.

[0014] Further, a plurality of heat dissipation fins are fixedly connected to the outer wall of the housing.

[0015] Further, it further includes an identifier for displaying the elastic force values corresponding to different stretching lengths of the compression spring.

[0016] Compared with the prior art, the beneficial technical effects of the present utility model are:

[0017] For a lithium-ion battery of the present utility model, when high-pressure gas pushes the exhaust assembly to open the exhaust hole, the high-pressure gas is discharged from the exhaust hole to avoid explosion. The minimum opening pressure value of the exhaust hole is adjusted through the adjustment assembly, thereby reducing the probability of the outer shell cracking before reaching the minimum opening pressure value, and effectively preventing the explosion of the lithium-ion battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present utility model will be further described below in conjunction with the drawings.

[0019] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0020] Figure 2 is a front view structural schematic diagram of the present utility model;

[0021] Figure 3 is Figure 2 a sectional structural schematic diagram taken along A-A in

[0022] Figure 4 is Figure 3 an enlarged structural schematic diagram at B in

[0023] Figure 5 is a three-dimensional structural schematic diagram of the first plate body and the second plate body.

[0024] Description of the reference numerals: 1. Outer shell; 101. Sealing plate; 2. Core body; 3. End cover; 4. Exhaust hole; 5. First plate body; 501. Vent hole; 6. Second plate body; 7. Compression spring; 8. First sealing ring; 9. Screw rod; 10. Sliding plate; 11. Nut; 12. Lock nut; 13. Second sealing ring; 17. Heat sink; 18. Pressure line. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The core of the present utility model is to provide a lithium-ion battery that can prevent the explosion of the lithium-ion battery.

[0026] The technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0027] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "middle", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0028] In a specific embodiment of the present utility model, as Figures 1 to 5 shown, it includes a housing 1, a core body 2 disposed in the inner cavity of the housing 1. A sealing plate 101 is fixedly attached to the opening at one end of the housing 1, and an end cover 3 is provided at the opening at the other end of the housing 1. The positive and negative terminal ends of the core body 2 both protrude from the sealing plate 101. An exhaust hole 4 communicating with the inner cavity of the housing 1 is formed on the housing 1, the sealing plate 101 or the end cover 3, and an exhaust assembly is provided on the exhaust hole 4; it further includes an adjustment assembly, which is correspondingly arranged with the exhaust assembly and can adjust the minimum opening pressure of the exhaust assembly.

[0029] Specifically, high-pressure gas pushes the exhaust assembly to open the exhaust hole 4, and then the high-pressure gas is discharged from the exhaust hole 4 to avoid explosion. By adjusting the minimum opening pressure value of the exhaust hole 4 through the adjustment assembly, the probability of the housing 1 cracking first before reaching the minimum opening pressure value is reduced, effectively preventing the explosion of the lithium-ion battery.

[0030] The exhaust assembly includes a first plate body 5, a compression spring 7 and a fixing rod. The first plate body 5 is slidably connected and disposed in the exhaust hole 4. The first plate body 5 is located at one end of the exhaust hole 4 close to the inner cavity of the housing 1. One side of the first plate body 5 away from the inner cavity of the housing 1 is fixedly connected to one end of the fixing rod, and the other end of the fixing rod is fixedly connected to a second plate body 6. The top end of the second plate body 6 is slidably matched with the exhaust hole 4; a ventilation hole 501 is formed on one side of the first plate body 5 close to the inner cavity of the housing 1 and the ventilation hole 501 penetrates through the other side of the first plate body 5; a convex ring is coaxially fixed at the bottom end of the second plate body 6, and a first sealing ring 8 is provided between the convex ring and the outer wall for forming the exhaust hole 4; the adjustment assembly is fixedly connected to the outer wall for forming the exhaust hole 4, and the compression spring 7 is disposed between the second plate body 6 and the adjustment assembly.

[0031] Specifically, high-pressure gas pushes the first plate body 5 outwards, the first plate body 5 drives the fixing rod and the second plate body 6 to move synchronously. At the same time, the compression spring 7 is compressed. When the second plate body 6 disengages from the exhaust hole 4, the high-pressure gas enters between the first plate body 5 and the second plate body 6 through the ventilation hole 501, and then is discharged from the gap between the second plate body 6 and the outer wall for forming the exhaust hole 4.

[0032] The adjusting assembly includes a screw rod 9 and a sliding plate 10. There are two screw rods 9, and one ends of the two screw rods 9 are respectively fixedly connected to the outer wall for opening the exhaust hole 4. One end of the compression spring 7 is fixedly connected to one side of the second plate body 6, and the other end of the compression spring 7 is fixedly connected to one side of the sliding plate 10. The two screw rods 9 respectively slide through both ends of the sliding plate 10, and a nut 11 is threadedly connected to the screw rod 9. The side of the sliding plate 10 away from the compression spring 7 abuts against the nut 11.

[0033] Specifically, by turning the nut 11, the distance between the sliding plate 10 and the second plate body 6 can be adjusted, then the length of the compression spring 7 changes, then the elastic force value of the compression spring 7 can be adjusted, and then the minimum opening pressure of the exhaust hole 4 can be adjusted.

[0034] It further includes a lock nut 12, and the lock nut 12 is threadedly connected to the screw rod 9. The end of the nut 11 away from the sliding plate 10 abuts against the lock nut 12.

[0035] Specifically, the lock nut 12 is used to prevent the nut 11 from loosening.

[0036] A second sealing ring 13 is arranged between the end cover 3 and the housing 1, and the end cover 3 and the housing 1 are detachably connected by screws.

[0037] A plurality of heat dissipation fins 17 are fixedly connected to the outer wall of the housing 1.

[0038] Specifically, the heat dissipation fins 17 are used to enhance the heat dissipation effect of the housing 1.

[0039] It further includes a mark for displaying the elastic force values corresponding to different stretching lengths of the compression spring 7.

[0040] Specifically, the mark can be directly engraved on the end cover 3, the housing 1 or the sealing plate 101; obviously, the mark can also be in the form of a sticker; the mark can be printed on the instruction manual of the lithium-ion battery. In addition, the mark can be located on the device where the lithium-ion battery is installed. As Figure 2 shown, the mark includes a rectangular coordinate system and a pressure line 18. The X-axis is used to display the length of the compression spring 7, and the Y-axis is used to display the elastic force value of the compression spring 7. The pressure line 18 is the change line of the elastic force values of different stretching lengths of the compression spring 7. By measuring the length of the compression spring 7, the minimum pressure value required for the exhaust hole 4 to open can be found from the mark. Obviously, the mark can be made in the form of a table.

[0041] Working principle of a lithium-ion battery of the present utility model: High-pressure gas pushes the first plate body 5 outwards. The first plate body 5 drives the fixed rod and the second plate body 6 to move synchronously. At the same time, the compression spring 7 is compressed. When the second plate body 6 disengages from the exhaust hole 4, the high-pressure gas enters between the first plate body 5 and the second plate body 6 through the ventilation hole 501, and then discharges from the gap between the second plate body 6 and the outer wall for opening the exhaust hole 4, thereby effectively avoiding explosion. By turning the nut 11, the distance between the sliding plate 10 and the second plate body 6 can be adjusted, so the length of the compression spring 7 changes, the elastic force value of the compression spring 7 can be adjusted, and the minimum opening pressure of the exhaust hole 4 can be adjusted.

[0042] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other, and the embodiments can be combined with each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description in the method part.

[0043] The above embodiments are only descriptions of the preferred modes of the present utility model, and do not limit the scope of the present utility model. Without departing from the design spirit of the present utility model, various deformations and improvements made by those of ordinary skill in the art to the technical solution of the present utility model shall fall within the protection scope determined by the claims of the present utility model.

Claims

1. A lithium-ion battery, comprising a housing (1) and a core body (2) disposed in the inner cavity of the housing (1). A sealing plate (101) is fixedly provided at the opening at one end of the housing (1), and an end cover (3) is provided at the opening at the other end of the housing (1). The positive and negative terminal ends of the core body (2) both protrude out of the sealing plate (101), and it is characterized in that, An exhaust hole (4) communicating with the inner cavity of the housing (1) is provided on the housing (1), the sealing plate (101) or the end cover (3), and an exhaust component is arranged on the exhaust hole (4); further comprising an adjusting component, the adjusting component is arranged corresponding to the exhaust component and can adjust the minimum opening pressure of the exhaust component.

2. The lithium-ion battery according to claim 1, characterized in that: The exhaust component includes a first plate body (5), a compression spring (7) and a fixing rod. The first plate body (5) is slidably connected in the exhaust hole (4). The first plate body (5) is located at one end of the exhaust hole (4) close to the inner cavity of the housing (1). One side of the first plate body (5) away from the inner cavity of the housing (1) is fixedly connected to one end of the fixing rod, and the other end of the fixing rod is fixedly connected to a second plate body (6). The top end of the second plate body (6) is slidably matched with the exhaust hole (4); a ventilation hole (501) is provided on one side of the first plate body (5) close to the inner cavity of the housing (1) and the ventilation hole (501) penetrates through the other side of the first plate body (5); a convex ring is coaxially fixed at the bottom end of the second plate body (6), and a first sealing ring (8) is arranged between the convex ring and the outer wall for opening the exhaust hole (4); the adjusting component is fixedly connected to the outer wall for opening the exhaust hole (4), and the compression spring (7) is arranged between the second plate body (6) and the adjusting component.

3. The lithium-ion battery according to claim 2, characterized in that: The adjusting component includes a screw rod (9) and a sliding plate (10). There are two screw rods (9), and one ends of the two screw rods (9) are respectively fixedly connected to the outer wall for opening the exhaust hole (4). One end of the compression spring (7) is fixedly connected to one side of the second plate body (6), and the other end of the compression spring (7) is fixedly connected to one side of the sliding plate (10). The two screw rods (9) respectively slide through both ends of the sliding plate (10), and a nut (11) is threadedly connected to the screw rod (9). The side of the sliding plate (10) away from the compression spring (7) abuts against the nut (11).

4. The lithium ion battery according to claim 3, characterized in that: Further comprising a lock nut (12), the lock nut (12) is threadedly connected to the screw rod (9), and one end of the nut (11) away from the sliding plate (10) abuts against the lock nut (12).

5. The lithium ion battery according to claim 1, characterized in that: A second sealing ring (13) is arranged between the end cover (3) and the housing (1), and the end cover (3) and the housing (1) are detachably connected by screws.

6. The lithium ion battery according to claim 1, characterized in that: A plurality of heat dissipation fins (17) are fixedly connected to the outer wall of the housing (1).

7. The lithium ion battery according to claim 3, wherein: Further comprising an indicator for displaying the elastic force values corresponding to different telescopic lengths of the compression spring (7).

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