Battery pressure relief assembly and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a battery pressure relief assembly and a battery, the battery pressure relief assembly comprises: a battery housing, which is enclosed by a cover plate and a housing, and is internally provided with an accommodating cavity; the pressure release valve is mounted in a pressure release valve mounting hole formed in the cover plate or the shell and comprises a fixing part, a pressure release valve body and a pressure release valve body, the movable part is movably matched with the fixed part, and an exhaust hole channel penetrates through the movable part; the movable part has a blocking state in which the movable part is aligned with the fixed part to block the exhaust duct and a conducting state in which the movable part is staggered with the fixed part under the pressure in the accommodating cavity, and in the conducting state, the exhaust duct moves to a position in which the accommodating cavity is communicated with the outside; one end of the elastic part is connected with the movable part, and when the pressure in the containing cavity is smaller than the elastic force of the elastic part, the elastic part drives the movable part to move so as to be switched from the conduction state to the blocking state. The battery pressure relief assembly provided by the utility model can ensure the secondary use of the battery after exhausting.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery pressure relief component and a battery. Background Art

[0002] At present, the operation of electric vehicles and consumer electronic products mainly comes from the energy provided by lithium-ion batteries. During the use of lithium batteries, especially under high temperature conditions, the electrolyte is prone to side reactions and decomposition to produce a large amount of gas. The accumulation of battery gas will not only cause the battery performance to deteriorate, but also cause excessive internal pressure in the battery, which may cause explosion and other safety risks in severe cases.

[0003] At present, most of the ways to relieve pressure on battery cells are to relieve pressure through explosion-proof valves, but after the explosion-proof valves relieve pressure, the battery cells are basically scrapped and cannot be reused. In the related art, there is a lack of pressure relief devices that can relieve pressure during the use of the battery and continue to be used after the pressure relief. Utility Model Content

[0004] In view of this, the utility model provides a battery pressure relief component and a battery to solve the problem that the battery cannot be pressure-relieved during use and can continue to be used after the pressure relief.

[0005] In a first aspect, the utility model provides a battery pressure relief assembly, comprising:

[0006] The battery shell is formed by enclosing the cover plate and the shell, and a receiving cavity is formed in the battery shell;

[0007] The pressure relief valve is installed in the pressure relief valve installation hole opened on the cover plate or the shell. The pressure relief valve includes:

[0008] Fixings;

[0009] The movable part is movably matched with the fixed part, and an exhaust channel is penetrated in the movable part;

[0010] The movable part has a blocking state in which it is aligned with the fixed part to block the exhaust passage, and a conducting state in which the movable part is displaced from the fixed part by the pressure in the accommodating chamber. In the conducting state, the exhaust passage moves to a position that connects the accommodating chamber with the outside world.

[0011] The elastic member has one end connected to the movable member. When the pressure in the accommodating chamber is less than the elastic force of the elastic member, the elastic member drives the movable member to move so as to switch from the conducting state to the blocking state.

[0012] Beneficial effect: By opening a pressure relief valve installation hole on the cover plate or the housing, and installing the pressure relief valve in the pressure relief valve installation hole, when the pressure relief valve is in a blocked state, the closed accommodating chamber can be isolated from the outside world, and when the pressure relief valve is in a conducting state, the closed accommodating chamber can be connected to the outside world, so that the high-pressure gas generated inside the accommodating chamber is discharged to achieve pressure relief. In the conducting state, the exhaust channel moves to a position that connects the accommodating chamber to the outside world, and by reasonably selecting the opening pressure of the movable part, the pressure inside the accommodating chamber can be relieved according to the pressure inside the accommodating chamber, avoiding the situation where the pressure inside the accommodating chamber is too high and causes an explosion, thereby reducing safety hazards. By further arranging an elastic member and connecting the elastic member to the movable member, when the pressure in the accommodating chamber is less than the elastic force of the elastic member, the elastic member can drive the movable member to move to switch from the conducting state to the blocking state, so that after the internal pressure of the accommodating chamber is reduced, the accommodating chamber is changed back to the closed state, so that the battery can continue to be used after the pressure is released, thereby avoiding the situation that the gas generated by the normal use of the battery cannot be discharged in time, posing a safety hazard, and at the same time avoiding the situation that the gas generated by the normal use of the battery will cause the entire battery to be scrapped after being discharged, thereby improving the safety and reusability of the battery and reducing the maintenance cost.

[0013] In an optional embodiment, the pressure relief valve further includes:

[0014] An abutment member, adapted to abut against a limiting portion formed on the cover plate or the housing;

[0015] It is defined that the movable part and the fixed part together form a blocking component, and the abutting part and the blocking component are respectively arranged on both sides of the limiting part.

[0016] Beneficial effect: The abutment member and the blocking assembly are respectively arranged on both sides of the limiting portion, thereby achieving the fixation of the pressure relief valve and the cover plate or the housing, and preventing the pressure relief valve from being completely disengaged from the pressure relief valve installation hole when the pressure is released.

[0017] In an optional implementation, two ends of the elastic member are respectively connected to the abutment member and the movable member.

[0018] Beneficial effect: By connecting the elastic part between the abutment part and the movable part, it can be ensured that after the movable part is lifted up by the pressure in the accommodating chamber and dislocated from the fixed part, it can be further reset relative to the fixed abutment part, ensuring that the movable part after reset can still be aligned with the fixed part to block the exhaust channel.

[0019] In an optional embodiment, an air intake channel is formed through the abutment member, and the air intake channel is communicated with an inlet end of the air exhaust channel.

[0020] Beneficial effect: By forming an air inlet channel through the abutment, it can be ensured that the air pressure inside the accommodating cavity can be smoothly transmitted to the movable part, and by lifting the movable part, the switching of the movable part from the blocking state to the conducting state is achieved.

[0021] In an optional embodiment, in the blocked state, the outlet end of the exhaust channel is blocked by a cover plate or a housing;

[0022] And / or, in the blocked state, the outlet end of the exhaust passage is blocked by the fixing member.

[0023] In an optional embodiment, in the conducting state, the area of ​​the cover plate or the housing in the pressure relief valve mounting hole and the pressure relief valve are jointly enclosed to form an air storage chamber;

[0024] So that the inlet end of the air inlet channel is spaced apart from the inlet end of the exhaust channel.

[0025] Beneficial effect: After the movable part is lifted up, the gas will be temporarily stored in the gas storage cavity. By forming the gas storage cavity, the pressure in the area can be kept relatively stable, so that the lifting state of the movable part is maintained more stably, and the movable part can be prevented from fluctuating.

[0026] In an optional embodiment, a first clamping portion is formed on the movable member, and a second clamping portion is formed on the fixed member, and the first clamping portion and the second clamping portion engage with each other so that the movable member can only move relative to the fixed member along the exhaust direction.

[0027] In a second aspect, the utility model further provides a battery, comprising: the battery pressure relief assembly as described above.

[0028] In an optional embodiment, the battery housing is also provided with an explosion-proof valve.

[0029] In an optional embodiment, the battery housing is further provided with a liquid injection hole, or the exhaust hole of the pressure relief valve is suitable for liquid injection.

[0030] Because the battery includes a battery pressure relief assembly, which has the same effect as the battery pressure relief assembly, it will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is a schematic diagram of the pressure relief valve of the utility model;

[0033] Figure 2 It is a perspective schematic diagram of the pressure relief valve of the utility model;

[0034] Figure 3 A top view of the battery of the utility model;

[0035] Figure 4 It is a cross-sectional schematic diagram of the battery of the utility model;

[0036] Figure 5 It is a cross-sectional view of the battery pressure relief assembly of the utility model in a closed state;

[0037] Figure 6 It is a cross-sectional view of the battery pressure relief assembly of the utility model in an open state;

[0038] Figure 7 It is a cross-sectional view of a battery pressure relief assembly in another embodiment of the utility model in an open state.

[0039] Description of reference numerals:

[0040] 1. Cover plate; 11. Liquid injection hole; 12. Pressure relief valve installation hole; 13. Limiting part; 14. Gas storage chamber; 2. Pole; 4. Explosion-proof valve; 6. Insulation parts;

[0041] 3. Pressure relief valve; 31. Movable part; 311. First clamping part; 312. Exhaust hole; 32. Fixed part; 321. Second clamping part; 33. Elastic part; 34. Abutting part; 341. Inlet hole. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0043] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0046] Combine the following Figures 1 to 7 , describing an embodiment of the utility model.

[0047] According to an embodiment of the present utility model, on the one hand, a battery pressure relief assembly is provided, comprising:

[0048] The battery shell is formed by enclosing the cover plate and the shell, and a receiving cavity is formed in the battery shell;

[0049] The pressure relief valve 3 is installed in the pressure relief valve installation hole 12 opened on the cover plate or the housing. The pressure relief valve 3 includes:

[0050] Fixing member 32;

[0051] The movable member 31 is movably matched with the fixed member 32, and an exhaust passage 312 is penetrated through the movable member 31;

[0052] The movable member 31 has a blocking state in which it is aligned with the fixed member 32 to block the exhaust passage 312, and a conducting state in which the movable member 31 is displaced from the fixed member 32 by the pressure in the accommodating chamber. In the conducting state, the exhaust passage 312 moves to a position that connects the accommodating chamber with the outside.

[0053] One end of the elastic member 33 is connected to the movable member 31 . When the pressure in the accommodating chamber is less than the elastic force of the elastic member 33 , the elastic member 33 drives the movable member 31 to move so as to switch from the conducting state to the blocking state.

[0054] The battery includes a shell, the interior of the shell is suitable for placing the electrode group, the shell is partially formed with an opening, the cover plate is arranged at the opening of the shell, and the shell and the cover plate are sealed and connected. In this embodiment, the shell structure formed by the cover plate and the shell is called a battery shell, and a closed accommodating cavity is formed inside the battery shell.

[0055] By opening a pressure relief valve mounting hole 12 on the cover plate or the shell, the pressure relief valve 3 is installed in the pressure relief valve mounting hole 12. When the pressure relief valve 3 is in a blocked state, the closed accommodating chamber can be isolated from the outside world. When the pressure relief valve 3 is in a conducting state, the closed accommodating chamber can be connected to the outside world, thereby discharging the high-pressure gas generated inside the accommodating chamber to achieve pressure relief.

[0056] As a specific structural form of the pressure relief valve 3, the pressure relief valve 3 includes a fixed part 32 and a movable part 31 that cooperate with each other, and an exhaust channel 312 runs through the movable part 31; the movable part 31 has a blocking state in which it is opposite to the fixed part 32 to block the exhaust channel 312, and a conducting state in which the movable part 31 is misaligned with the fixed part 32 due to the pressure in the accommodating chamber. In the conducting state, the exhaust channel 312 moves to a position that connects the accommodating chamber with the outside world. By reasonably selecting the opening pressure of the movable part 31, the pressure inside the accommodating chamber can be relieved according to the pressure conditions inside the accommodating chamber, thereby avoiding the situation where the pressure inside the accommodating chamber is too high and causes an explosion, thereby reducing safety hazards.

[0057] In addition, by further arranging an elastic member 33 and connecting the elastic member 33 to the movable member 31, when the pressure in the accommodating chamber is less than the elastic force of the elastic member 33, the elastic member 33 can drive the movable member 31 to move, so as to switch from the conducting state to the blocking state, so that after the internal pressure of the accommodating chamber is reduced, the accommodating chamber is turned into a closed state again, so that the battery can continue to be used after the pressure is released, thereby avoiding the situation that the gas generated by the normal use of the battery cannot be discharged in time, posing a safety hazard, and at the same time avoiding the situation that the gas generated by the normal use of the battery will cause the entire battery to be scrapped after being discharged, thereby improving the safety and reusability of the battery and reducing the maintenance cost.

[0058] In some embodiments, in combination Figure 2 As shown, the pressure relief valve 3 also includes:

[0059] The abutment member 34 is adapted to abut against the limiting portion 13 formed on the cover plate or the housing;

[0060] The movable member 31 and the fixed member 32 are defined to form a blocking assembly together, and the abutting member 34 and the blocking assembly are respectively disposed on two sides of the limiting portion 13 .

[0061] In order to realize the installation of the pressure relief valve 3 in the pressure relief valve installation hole 12 so that the pressure relief valve 3 is fixed to the cover plate 1 or the housing, the pressure relief valve 3 also includes an abutment member 34, which is suitable for abutting against the limit portion 13 formed on the cover plate or the housing; Figure 5As shown, the limiting portion 13 is constructed as a constricted structure formed in the pressure relief valve mounting hole 12, and the abutment member 34 and the blocking assembly are respectively arranged on both sides of the limiting portion 13, so as to fix the pressure relief valve 3 and the cover plate 1 or the shell, and prevent the pressure relief valve 3 from being disengaged from the pressure relief valve mounting hole 12 as a whole when relieving pressure.

[0062] In some embodiments, in combination Figure 5 As shown, two ends of the elastic member 33 are connected to the abutting member 34 and the movable member 31 respectively.

[0063] By connecting the elastic member 33 between the abutment member 34 and the movable member 31, it can be ensured that after the movable member 31 is lifted up by the pressure in the accommodating chamber and displaced from the fixed member 32, it can be further reset relative to the fixed abutment member 34, ensuring that the reset movable member 31 can still be aligned with the fixed member 32 to block the exhaust duct 312.

[0064] In some embodiments, in combination Figure 5 As shown, an air inlet channel 341 is formed through the abutting member 34 , and the air inlet channel 341 is communicated with the inlet end of the air outlet channel 312 .

[0065] By forming an air inlet channel 341 through the abutment member 34, it can be ensured that the air pressure inside the accommodating chamber can be smoothly transmitted to the movable member 31, and by lifting the movable member 31, the movable member 31 can be switched from a blocked state to a conductive state.

[0066] In some embodiments, in combination Figures 5 to 7 As shown, in the blocked state, the outlet end of the exhaust channel 312 is blocked by the cover plate or the housing;

[0067] And / or, in the blocked state, the outlet end of the exhaust passage 312 is blocked by the fixing member 32 .

[0068] It should be noted that the movable part 31 has an exhaust hole 312 running through it. When the movable part 31 is in a blocked state, the exhaust hole 312 is blocked so that the accommodating cavity is not connected to the outside. At this time, the opening direction of the exhaust hole 312 can be various, for example Figure 5 , Figure 6 As shown, the outlet of the exhaust channel 312 faces the cover plate or the housing, and the exhaust channel 312 can be blocked by the side wall of the cover plate or the housing; Figure 7 As shown, the outlet of the exhaust hole 312 faces the fixing member 32 , and the exhaust hole 312 can be blocked specifically by the fixing member 32 .

[0069] As the movable member 31 is lifted up, when the outlet of the exhaust channel 312 is exposed, the accommodating chamber can be connected to the outside.

[0070] In this embodiment, the inlet of the exhaust hole 312 is opened on a side surface of the movable part 31 facing the accommodating cavity, and the outlet of the exhaust hole 312 is opened on a side wall surface of the movable part 31 .

[0071] In some embodiments, in combination Figure 6 As shown, in the conducting state, the area of ​​the cover plate or the housing in the pressure relief valve mounting hole 12 and the pressure relief valve 3 together enclose an air storage chamber 14;

[0072] The inlet end of the air inlet channel 341 is spaced apart from the inlet end of the air outlet channel 312 .

[0073] After the movable part 31 is lifted up, the gas will be temporarily stored in the gas storage chamber 14. By forming the gas storage chamber 14, the pressure in the area can be kept relatively stable, so that the lifted state of the movable part 31 is maintained more stably, and the movable part 31 can be prevented from fluctuating.

[0074] In some embodiments, in combination Figure 1 As shown, a first clamping portion 311 is formed on the movable member 31, and a second clamping portion 321 is formed on the fixed member 32. The first clamping portion 311 and the second clamping portion 321 engage with each other so that the movable member 31 can only move relative to the fixed member 32 along the exhaust direction.

[0075] The first clamping portion 311 matches the second clamping portion 321 in shape, and the matching cross-sectional shape of the first clamping portion 311 and the second clamping portion 321 can be semicircular, trapezoidal, triangular or other special-shaped structures.

[0076] According to an embodiment of the present utility model, on the other hand, a battery is provided, including: the battery pressure relief assembly as described above.

[0077] In some embodiments, in combination Figure 3 , Figure 4 As shown, the battery housing is also provided with an explosion-proof valve 4. As a variation, the battery housing may or may not have an explosion-proof valve 4.

[0078] In some embodiments, in combination Figure 3 , Figure 4 As shown, the battery housing is also provided with a pole 2.

[0079] In some embodiments, in combination Figure 3 , Figure 4 As shown, the battery housing is also provided with a liquid injection hole 11, or the exhaust hole 312 of the pressure relief valve 3 is suitable for liquid injection.

[0080] During specific use, the pressure relief valve 3 can not only be used for pressure relief, but also can be used for liquid injection.

[0081] In some embodiments, in combination Figure 4 As shown, the battery further comprises an insulating member 6 , and the bottom of the abutting member 34 of the pressure relief valve 3 is flush with the insulating member 6 in normal circumstances.

[0082] Obviously, the above embodiments are only examples for clear explanation, and are not intended to limit the implementation methods. Although the embodiments of the present utility model are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present utility model, and such modifications and variations are all within the scope defined by the present utility model.

Claims

1. A battery pressure relief assembly, characterized in that: include: A battery shell, formed by enclosing a cover plate and a shell, wherein a receiving cavity is formed in the battery shell; The pressure relief valve (3) is installed in a pressure relief valve installation hole (12) provided on the cover plate or the housing, and the pressure relief valve (3) comprises: A fixing member (32); A movable part (31) is movably matched with the fixed part (32), and an exhaust passage (312) is penetrated through the movable part (31); The movable member (31) has a blocking state in which it is aligned with the fixed member (32) to block the exhaust passage (312), and a conducting state in which the movable member (31) is displaced from the fixed member (32) by the pressure in the accommodating chamber. In the conducting state, the exhaust passage (312) moves to a position that connects the accommodating chamber to the outside. The elastic member (33) has one end connected to the movable member (31). When the pressure in the accommodating chamber is less than the elastic force of the elastic member (33), the elastic member (33) drives the movable member (31) to move so as to switch from a conducting state to a blocking state.

2. The battery pressure relief assembly according to claim 1, characterized in that: The pressure relief valve (3) further comprises: An abutment member (34) adapted to abut against a limiting portion (13) formed on the cover plate or the housing; The movable part (31) and the fixed part (32) are defined to jointly form a blocking component, and the abutting part (34) and the blocking component are respectively arranged on two sides of the limiting portion (13).

3. The battery pressure relief assembly according to claim 2, characterized in that: Two ends of the elastic member (33) are respectively connected to the abutment member (34) and the movable member (31).

4. The battery pressure relief assembly according to claim 2, characterized in that: An air intake channel (341) is formed through the abutment member (34), and the air intake channel (341) is communicated with the inlet end of the air exhaust channel (312).

5. The battery pressure relief assembly according to claim 4, characterized in that: In the blocking state, the outlet end of the exhaust channel (312) is blocked by the cover plate or the shell; And / or, in the blocked state, the outlet end of the exhaust duct (312) is blocked by the fixing member (32).

6. The battery pressure relief assembly according to claim 5, characterized in that: In the conducting state, the area of ​​the cover plate or the housing within the pressure relief valve mounting hole (12) and the pressure relief valve (3) are enclosed together to form an air storage chamber (14); The air inlet channel (341) is spaced apart from the inlet end of the air outlet channel (312).

7. The battery pressure relief assembly according to any one of claims 1 to 6, characterized in that: The movable part (31) is formed with a first clamping portion (311), and the fixed part (32) is formed with a second clamping portion (321), the first clamping portion (311) and the second clamping portion (321) being engaged with each other so that the movable part (31) can only move relative to the fixed part (32) along the exhaust direction.

8. A battery, characterized in that: include: A battery pressure relief assembly as claimed in any one of claims 1 to 7.

9. The battery according to claim 8, characterized in that The battery casing is also provided with an explosion-proof valve (4).

10. The battery according to claim 8, characterized in that The battery shell is also provided with a liquid injection hole (11), or the exhaust channel (312) of the pressure relief valve (3) is suitable for liquid injection.

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