A battery explosion relief structure

Abstract

The present application discloses a battery explosion venting structure, comprising a cylindrical housing, a movable explosion venting body disposed within the housing, and an elastic member disposed within the housing and used to control the position of the movable explosion venting body; wherein the elastic member is disposed within the inner cavity of the movable explosion venting body. During liquid injection, the present application connects the liquid injection connector to the housing via a threaded connection, squeezing the movable explosion venting body from the sealing section to the liquid injection section. Because the outer diameter of the sealing ring is smaller than the inner diameter of the liquid injection section, liquid injection and vacuuming can be performed. After liquid injection is completed, the elastic member pushes the movable explosion venting body to the sealing section for sealing, thereby achieving vacuuming, liquid injection, and explosion venting functions. The structure is simple, facilitates battery sealing, and can be reused multiple times.

Description

Technical Field

[0001] The present application relates to the technical field of lithium batteries, and in particular to a battery explosion venting structure with vacuuming and liquid injection functions. Background Art

[0002] Lithium-ion batteries have been widely used in digital electronic products, power tools, electric bicycles, electric vehicles, photovoltaic power generation and wind power generation for peak and valley power storage. In recent years, with the increasing use of lithium-ion batteries, some defects of lithium-ion batteries have begun to be exposed, some leaking, some catching fire, and some even exploding. There are many reasons for these problems. One of the main reasons is that this type of battery is a liquid battery with electrolyte substances. These liquid substances vaporize and expand when overheated. When they expand to a certain internal pressure, they may crack the weld seams of the battery shell, causing leakage from the cracks. The leaked electrolyte is extremely easy to ignite.

[0003] Lithium batteries typically consist of a housing and a cover secured to the housing. The cover is typically equipped with vents, vacuum holes, and injection ports. For battery safety, an explosion-proof membrane is also welded to the cover. These holes and welds can compromise the battery's seal reliability. During use, if electrolyte leaks through these holes and welds, it can affect the battery's energy and lifespan. Electrolyte is flammable, and spillage poses a fire hazard.

[0004] Patent No. CN203377316U discloses a drip-proof battery filling device, including a liquid filling needle and a vacuum shell, the vacuum shell is provided with a channel connected to the vacuum device, the interior of the vacuum shell is a cavity, the upper end face of the vacuum shell is provided with a first through hole, the first through hole is penetrated by the liquid filling needle, the bottom of the liquid filling needle is provided with a sealing surface, the sealing surface is provided with a second through hole, the sealing surface is against the lower end face of the vacuum shell, the lower end face is provided with a third through hole that cooperates with the second through hole, and the lower end face is also provided with an air extraction hole. The utility model effectively prevents the residual electrolyte in the liquid filling needle from dripping, thereby preventing the electrolyte from dripping to the outside of the battery. The patent only discloses a device to prevent electrolyte dripping, but the device does not solve the function of sealing the battery, nor does it solve the explosion venting function.

[0005] Patent No. CN201510851791.3 discloses a safety valve for battery injection, comprising a valve body with a housing threadedly attached to the valve body. A one-way membrane is mounted on the valve body via a pressure plate. The valve body also has an exhaust hole, and both the valve body and the housing have injection holes. The exhaust hole is located on the side of the valve body. An O-ring is installed in the housing. The one-way membrane in the valve body allows only the escape of gas and moisture, while preventing the entry of external gas and moisture, ensuring internal battery safety. However, the safety valve lacks a vacuum function, making electrolyte prone to splashing during injection.

[0006] Patent No. CN102208584B discloses a dual-purpose valve for lithium-ion batteries, including a valve body and a valve core. The valve body's cylindrical portion is threaded on its inner wall, and the bottom cap has an axially oriented injection hole in its center. A gland is positioned within the cylindrical portion of the valve body, with an axially oriented primary exhaust hole and a groove on its bottom surface. The top cap also has an axially oriented secondary exhaust hole, and a cylindrical electrolyte absorption pad is positioned between the top and gland caps. The valve core is positioned between the gland cap's groove and the injection hole. The deformation of this rubber valve core is difficult to calculate, making machining difficult and resulting in unsatisfactory explosion relief. Summary of the Invention

[0007] In order to solve the above technical problems, the technical solutions adopted in this application are as follows:

[0008] The present application provides a battery explosion venting structure, comprising a cylindrical shell, a movable explosion venting body disposed within the shell, and an elastic member disposed within the shell and used to control the position of the movable explosion venting body, wherein the elastic member is disposed in an inner cavity of the movable explosion venting body.

[0009] Furthermore, in the embodiments provided herein, the housing includes a sealing section and a liquid injection section, the movable explosion relief body being disposed in the sealing section, and the elastic member being disposed in the liquid injection section; wherein the inner diameter of the liquid injection section is larger than that of the sealing section. The liquid injection section includes a retaining spring assembly for retaining the elastic member. The retaining spring assembly includes a retaining spring groove disposed on the inner wall of the liquid injection section, a retaining spring disposed within the retaining spring groove, and an elastic member retaining plate disposed between the retaining spring and the elastic member. The elastic member is a spring.

[0010] Furthermore, in the embodiments provided herein, the movable explosion vent is hollow; a sealing membrane is provided on the end of the movable explosion vent remote from the liquid injection section; a sealing groove is provided on the outer wall of the movable explosion vent, and a sealing ring is installed within the sealing groove. The outer diameter of the sealing ring is larger than the inner diameter of the sealing section, and smaller than the inner diameter of the liquid injection section. A sealing gasket is provided between the side of the movable explosion vent remote from the elastic member and the housing.

[0011] The present application only requires opening a hole in the battery shell and installing the explosion-proof structure of the present application. When injecting liquid, the injection connector is connected to the shell through a thread, and the movable explosion-proof body is squeezed to move from the sealing section to the injection section. Since the outer diameter of the sealing ring is smaller than the inner diameter of the injection section, liquid injection / vacuuming can be performed. After the injection is completed, the movable explosion-proof body is pushed to the sealing section through the elastic part for sealing, thereby realizing the functions of vacuuming, liquid injection, and explosion-proofing. The structure is simple, which is conducive to the sealing of the battery and can be used repeatedly.

[0012] Other advantages, objectives and features of the present application will be reflected in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0014] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present application.

[0015] Figure 2 This is an exploded diagram of the overall structure of an embodiment of the present application.

[0016] Figure 3 This is a schematic diagram of the shell structure of an embodiment of the present application.

[0017] Figure 4 This is a schematic diagram of the structure of the movable explosion relief body according to an embodiment of the present application. DETAILED DESCRIPTION

[0018] The present application will be further described below in conjunction with the accompanying drawings so that those skilled in the art can implement it with reference to the description.

[0019] It should be understood that terms such as “having,” “including,” and “comprising” used herein do not prescribe the existence or addition of one or more other elements or combinations thereof.

[0020] The technical solution of the present application is described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] like Figures 1 to 4 As shown, the present application provides a battery explosion relief structure, comprising a cylindrical shell 1, a movable explosion relief body 3 disposed in the shell 1, and an elastic member 7 disposed in the shell 1 and used to control the position of the movable explosion relief body 3, wherein the elastic member 7 is disposed in the inner cavity of the movable explosion relief body 3.

[0022] like Figure 3 As shown, in the embodiment provided in the present application, the shell 1 includes: a sealing section 13 and a liquid injection section 11, the movable explosion relief body 3 is arranged in the sealing section 13, and the elastic member 7 is arranged in the liquid injection section 11; wherein, the inner diameter of the liquid injection section 12 is larger than the inner diameter of the sealing section 11.

[0023] like Figure 1 and 2 As shown, in the embodiment provided in the present application, the liquid injection section 11 includes a retaining spring assembly for restraining the elastic member 7. The retaining spring assembly includes a retaining spring groove 2 provided on the inner wall of the liquid injection section 11, a retaining spring 9 provided in the retaining spring groove 2, and an elastic member stopper 8 provided between the retaining spring 9 and the elastic member 7.

[0024] Optionally, in the embodiment provided in the present application, the elastic member 7 is a spring.

[0025] That is, Figure 1 As shown, there is an elastic member 7 in the inner cavity of the movable explosion relief body 4, and the elastic member 7 is tightly attached to the elastic member blocking piece 8. The elastic member blocking piece 8 is compressed by the clamping spring 9, and the clamping spring is clamped in the clamping spring groove 2 on the inner wall of the shell 1.

[0026] like Figure 4 As shown, in the embodiment provided in this application, the movable explosion venting body 3 is a hollow structure; a sealing membrane 5 is provided at one end of the movable explosion venting body 3 away from the liquid injection section 11; a sealing groove 4 is provided on the outer wall of the movable explosion venting body 3, and a sealing ring 6 is installed in the sealing groove 4. The outer diameter of the sealing ring 6 is larger than the inner diameter of the sealing section 12, and the outer diameter of the sealing ring 6 is smaller than the inner diameter of the liquid injection section 11.

[0027] Optionally, in the embodiment provided in the present application, a sealing gasket 10 is provided between the side of the movable explosion relief body 3 away from the elastic member 7 and the housing 1 to further ensure the sealing between the movable explosion relief body 3 and the housing 1 .

[0028] In the normal sealing state, the sealing ring 6 is pressed against the sealing section and sealed by the sealing gasket.

[0029] The working principle of the present application is as follows: during liquid injection, the vacuum / liquid injection connector 13 is screwed into the housing 1 through a thread, and the vacuum / liquid injection connector 13 squeezes the movable explosion relief body 3, and the spring is compressed, so that the movable explosion relief body 3 moves from the sealing section 12 to the liquid injection section 11. Since the outer diameter of the sealing ring 6 is smaller than the inner diameter of the liquid injection section 11, a gap is formed between the sealing ring 6 and the housing 1, so that the liquid injection connector 13 is connected to the interior of the battery through the liquid injection section 11, and the vacuum / liquid injection work can be carried out;

[0030] After the liquid injection is completed, the vacuum / liquid injection joint 13 is screwed out, and the movable explosion relief body 3 is pushed to the sealing section 12 by the spring, so that the vacuum / liquid injection joint 13 is blocked from the interior of the battery, and the sealing is achieved under the action of the sealing gasket 10.

[0031] When the battery experiences thermal runaway, the internal gas pressure of the battery increases and ruptures the explosion-venting membrane, achieving the explosion-venting effect.

[0032] Although the embodiments of the present application have been disclosed above, they are not limited to the applications listed in the description and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, further modifications can be easily realized. Therefore, without departing from the general concept defined by the claims and their equivalents, the present application is not limited to the specific details and illustrations shown and described herein.

Claims

1. A battery explosion venting structure, comprising a cylindrical shell, characterized in that: It also includes a movable explosion relief body arranged in the shell, and an elastic member arranged in the shell and used to control the position of the movable explosion relief body; Wherein, the elastic member is arranged in the inner cavity of the movable explosion relief body; The shell includes a sealing section and a liquid injection section, the movable explosion relief body is arranged in the sealing section, and the elastic member is arranged in the liquid injection section; Wherein, the inner diameter of the liquid injection section is larger than the inner diameter of the sealing section; The movable explosion venting body is a hollow structure; a sealing film is provided at one end of the movable explosion venting body away from the liquid injection section; a sealing groove is provided on the outer wall of the movable explosion venting body, and a sealing ring is installed in the sealing groove; The outer diameter of the sealing ring is larger than the inner diameter of the sealing section, and the outer diameter of the sealing ring is smaller than the inner diameter of the injection section; The liquid injection section includes a retaining spring assembly for limiting the elastic member.

2. A battery explosion relief structure according to claim 1, characterized in that: The clamping spring assembly includes a clamping spring groove arranged on the inner wall of the liquid injection section, a clamping spring arranged in the clamping spring groove, and an elastic member blocking piece arranged between the clamping spring and the elastic member.

3. A battery explosion relief structure according to claim 2, characterized in that: The elastic member is a spring.

4. A battery explosion relief structure according to claim 1, characterized in that: A sealing gasket is provided between the housing and the side of the movable explosion relief body away from the elastic member.

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