A battery explosion relief structure with vacuuming and liquid injection functions

Abstract

This application discloses a battery explosion venting structure with vacuuming and liquid injection functions, comprising a housing, an explosion venting structure disposed within the housing, the explosion venting structure comprising a valve flap for sealing a first through hole in the housing, a first elastic member disposed within a groove of the valve flap and for limiting movement of the valve flap, and an adjustment structure connected to the valve flap and for adjusting the elastic force of the first elastic member and the position of the valve flap; wherein the adjustment structure is connected to the housing. This application has a simple structure, integrating the three functions of vacuuming, liquid injection, and explosion venting. A single through hole facilitates battery sealing and allows for repeated use.

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] There are electrolyte substances inside lithium batteries. These liquid substances vaporize and expand when overheated. When they expand to a certain internal pressure, they may crack the welding seams of the battery shell, and the cracks will leak. The leaked electrolyte is extremely easy to ignite or explode.

[0003] Currently, lithium battery covers typically feature vent holes, vacuum holes, and liquid injection ports. For battery safety, explosion-proof membranes are also welded to the covers. These holes and welds compromise the battery's seal, and the reliability of the explosion-proof membranes remains a challenge.

[0004] Patent No. CN201812870U discloses a power lithium battery ball safety valve, including a valve cover, a valve body, a spring, a ball valve, and a sealing ring. The valve body is provided with a spring and a ball valve, the bottom of the valve body is provided with a stepped through hole, the upper step hole is provided with a sealing ring, the ball valve is resting on the sealing ring and the through hole, the valve cover is connected to the inner hole of the valve body, the lower end of the spring is resting on the ball valve, and the upper end of the spring is resting on the valve cover, which can realize the vacuuming and sealing explosion relief functions.

[0005] Patent No. CN211852920U discloses a mid-opening safety valve, comprising a valve body with an axially accommodating space within it. A spring is disposed within the valve body and can be axially extended and retracted within the valve body. A seal is a component with an inverted T-shaped cross section that engages with a groove. The upper end of the seal penetrates through a through hole into the groove, contacting one end of the spring. The lower end of the seal is located outside the groove and can be plugged into the first air outlet. This invention allows the valve disc to open at a height between slightly open and fully open.

[0006] Patent No. CN211852926U discloses a micro-opening high-pressure safety valve, which is similar to the safety valve disclosed in Patent No. CN211852920U. The air inlet and outlet of the valve body are vertical structures.

[0007] The valve bodies disclosed in the above prior art and patents only have a simple explosion relief or vacuum pumping structure, and do not have the function of combining vacuum pumping, liquid injection and explosion relief. Summary of the Invention

[0008] In order to solve the above technical problems, the technical solutions adopted in this application are as follows:

[0009] An embodiment of the present application provides a battery explosion-venting structure with vacuuming and liquid injection functions, comprising a shell, an explosion-venting structure disposed within the shell, the explosion-venting structure comprising a valve flap for sealing a first through hole of the shell, a first elastic member disposed in a groove of the valve flap and for limiting movement of the valve flap, and an adjustment structure connected to the valve flap and for adjusting the elastic force of the first elastic member and the position of the valve flap; wherein the adjustment structure is also connected to the shell.

[0010] In the embodiment provided in the present application, a sealing member is provided below the valve flap, the sealing member sealing the first through hole of the housing. The sealing member is fixed to the bottom surface of the valve flap. A plurality of second through holes are provided along the edge of the bottom of the valve flap groove.

[0011] In the embodiment provided in the present application, the adjustment structure includes a main adjustment structure for adjusting the threshold of the explosion relief structure, and a secondary adjustment structure for causing the valve disc to displace. The main adjustment structure is an adjustment nut. The secondary adjustment structure includes: a bolt column, a pressure plate, a loose nut, and a second elastic member; the lower end of the bolt column passes through the first elastic member and is connected to the center of the valve disc groove, and the upper end of the bolt column passes through the third through hole in the center of the pressure plate and a gasket and is connected to the loose nut; the second elastic member is arranged between the valve disc and the housing; wherein the pressure plate is limited by the main adjustment structure.

[0012] In the embodiment provided in the present application, the first elastic member and the second elastic member are springs.

[0013] This application first uses the primary adjustment structure to adjust the explosion relief structure to the desired threshold. When the internal pressure of the battery reaches the threshold, the internal air pressure of the battery and the secondary elastic member cause the valve flap / seal to displace, achieving the explosion relief function. When the battery is evacuated or liquid is injected, the secondary adjustment structure is adjusted to cause the first elastic member and valve body to contract, driving the seal away from the sealing port, connecting the battery and the explosion relief structure, thereby performing the vacuuming and / or injection operation. After the operation is completed, the secondary adjustment structure is adjusted to restore the first elastic member to its original state.

[0014] The adjustment structure of the present application does not change the original explosion relief pressure threshold.

[0015] The present invention has a simple structure and can realize the functions of vacuuming, liquid injection and explosion venting. The single nozzle is conducive to the sealing of the battery and can be used repeatedly.

[0016] 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 invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Figure 1 It is a perspective diagram of the overall structure of an embodiment of the present application.

[0019] Figure 2 Schematic diagram of the valve flap according to an embodiment of the present application.

[0020] Figure 3 This is an anatomical diagram of the internal structure of an embodiment of the present application. DETAILED DESCRIPTION

[0021] The present invention will be described in further detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0022] 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.

[0023] The terms "first" and "second" and the like in the description and claims of the embodiments of the present application are used to distinguish different objects rather than to describe a specific order of objects.

[0024] In the description of the embodiments of the present application, terms such as "upper" and "lower" are explained based on the drawings of the present application and do not represent a specific positional relationship.

[0025] In the description of the embodiments of the present application, unless otherwise specified, “plurality” means two or more.

[0026] The technical solution of the present application is described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] like Figures 1 to 3 As shown, an embodiment of the present application provides a battery explosion-proof structure with vacuuming and liquid injection functions, including a shell 1, an explosion-proof structure arranged in the shell 1, and the explosion-proof structure includes a valve flap 2 for sealing the first through hole 8 of the shell 1, a first elastic member 4 arranged in the groove of the valve flap 2 and used to limit the movement of the valve flap 2, and an adjustment structure connected to the valve flap 2 and used to adjust the elastic force of the first elastic member 4 and the position of the valve flap; wherein, the adjustment structure is also connected to the shell 1.

[0028] Optionally, in order to ensure the sealing between the valve flap 2 and the first through hole 8, in the embodiment provided in the present application, a flexible sealing member 7 is provided below the valve flap 2, and the sealing member 7 is used to seal the first through hole 8 of the housing 1.

[0029] Furthermore, in the embodiment provided in the present application, the sealing member 7 is fixed to the bottom surface of the valve disc 2 , and the staff may also choose different methods for connection.

[0030] Optionally, in order to ensure that the gas in the battery can be effectively and quickly ejected during pressure relief, or that the electrolyte can effectively and quickly enter the interior of the battery during liquid injection, in the embodiment provided in the present application, a plurality of second through holes 6 are provided along the edge of the bottom of the groove of the valve flap 2, and the arrangement at the bottom edge can prevent the seal 7 from blocking the second through holes 6.

[0031] It can be understood that in order to achieve the function of explosion relief or liquid injection, in the embodiment provided in this application, the adjustment structure includes a main adjustment structure 3 for adjusting the threshold of the explosion relief structure, and a secondary adjustment structure 5 for causing the valve disc to displace.

[0032] Optionally, the main adjustment structure 3 is an adjusting nut.

[0033] Optionally, the secondary adjustment structure 5 includes: a bolt column 51, a pressing plate 54, a tightening nut 52 and a second elastic member 9; the lower end of the bolt column 51 passes through the first elastic member 4 and is connected to the center of the groove of the valve flap 2, and the upper end of the bolt column 51 passes through a third through hole (not shown in the figure) in the center of the pressing plate 54 and a gasket 53 and is connected to the tightening nut 52; the second elastic member is arranged between the valve flap and the shell, and is used to assist the internal air pressure of the battery to push open the valve flap / seal, so that a passage is formed between the interior of the battery and the explosion relief structure to facilitate pressure relief; wherein, the pressing plate 54 is limited by the adjusting nut.

[0034] Furthermore, a third through hole (not shown in the figure) is provided at the center of the pressing plate 54 , and the inner diameter of the third through hole is larger than the outer diameter of the bolt column.

[0035] In the embodiment provided in the present application, preferably, the first elastic member and the second elastic member are springs.

[0036] The working principle of the present application is as follows: the present application first uses the main adjustment structure 3 to adjust the explosion relief structure to the required threshold value. When the internal pressure of the battery reaches the threshold value, the valve flap / seal is displaced under the joint action of the internal air pressure of the battery and the second elastic member, so that the battery and the explosion relief structure are connected, thereby realizing the explosion relief function.

[0037] When the battery is vacuumed or injected with liquid, the secondary adjustment structure 5 is adjusted to contract the first elastic member 4 and the valve flap 4, driving the sealing member 7 to leave the first through hole 8, so that the battery and the explosion relief structure are connected, thereby performing the vacuuming or injection operation. After the operation is completed, the secondary adjustment structure 5 is adjusted to restore the first elastic member 4 to its original state, thereby realizing the injection / vacuuming function.

[0038] 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 this application. For those skilled in the art, further modifications can be easily implemented. 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 with vacuuming and liquid injection functions, comprising a housing, and an explosion venting structure disposed within the housing, characterized in that: The explosion relief structure includes a valve flap for sealing the first through hole of the housing, a first elastic member disposed in the valve flap groove and for limiting the movement of the valve flap, and an adjustment structure connected to the valve flap and for adjusting the elastic force of the first elastic member and the position of the valve flap; Also included is a sealing member disposed below the valve flap, the sealing member sealing the first through hole of the housing; The adjustment structure is connected to the housing; the adjustment structure includes a main adjustment structure for adjusting the threshold of the explosion relief structure, and a secondary adjustment structure for causing the valve disc to move; The main adjustment structure is an adjustment nut; the main adjustment structure adjusts the explosion relief structure to the required threshold; The secondary adjustment structure includes a bolt column, a pressing plate, a tightening nut and a second elastic member; the lower end of the bolt column passes through the first elastic member and is connected to the center of the valve disc groove, and the upper end of the bolt column passes through the third through hole in the center of the pressing plate and the gasket and is connected to the tightening nut; the second elastic member is arranged between the valve disc and the shell; wherein, the pressing plate is limited by the main adjustment structure, and by adjusting the secondary adjustment structure, the battery and the explosion relief structure are connected to perform vacuum or liquid injection operations.

2. A battery explosion venting structure with vacuuming and liquid injection functions as claimed in claim 1, characterized in that: The sealing member is fixedly connected to the bottom surface of the valve disc.

3. The battery explosion venting structure with vacuuming and liquid injection functions according to claim 1, characterized in that: A plurality of second through holes are provided along the edge of the bottom of the valve disc groove.

4. The battery explosion venting structure with vacuuming and liquid injection functions according to claim 1, characterized in that: The first elastic member and the second elastic member are springs.

Images