Battery monomer, battery and electric device

Abstract

The utility model relates to a battery monomer, battery and electric device, including the shell and be provided the electrode subassembly in the shell, the shell is provided with the liquid injection structure, the liquid injection structure includes liquid injection hole, plugging piece and elastic piece, liquid injection hole is provided in the shell; the plugging piece is arranged in the shell and is used for sealing and opening the liquid injection hole; the elastic piece is arranged in the shell and connected to the inner wall of the shell and the plugging piece, and the elastic piece is used for applying elastic force close to the liquid injection hole to the plugging piece; when the external pressure borne by the single battery is greater than a first set value, the plugging piece is far away from the liquid injection hole under the action of the external pressure so as to open the liquid injection hole; when the external pressure is smaller than or equal to a first set value, the plugging piece gets close to the liquid injection hole under the action of the elastic piece to seal the liquid injection hole. When liquid supplementing is not needed, the blocking piece reliably seals the liquid injection hole under the action of the elastic force of the elastic piece, and when liquid supplementing is needed, the blocking piece overcomes the elastic force of the elastic piece under the action of external force, and the blocking piece can easily open the liquid injection hole.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery monomer, a battery and an electrical device. Background Art

[0002] Existing power batteries are generally provided with injection holes and explosion-proof valves on the battery casing. The injection holes are used to inject electrolyte into the battery casing. Electrolyte is an important main material of the battery, and its content will affect the length of the battery life. At the same time, in order to avoid moisture entering the battery and affecting the battery performance, the battery is only injected through the injection hole at the beginning of battery production and in a low-humidity environment. After the production is completed, the injection hole is welded and sealed to ensure that moisture does not enter the battery. However, at the same time, there is no channel between the battery and the outside world, and secondary injection cannot be performed. After a certain period of use, the electrolyte of this type of battery will be exhausted, and with the lack of electrolyte, the battery life will also deteriorate rapidly. If the electrolyte cannot be replenished, the battery life will be greatly affected. How to provide a battery injection hole assembly that can perform secondary injection is a technical problem that needs to be solved in this field. Utility Model Content

[0003] To this end, the utility model provides a battery cell capable of secondary liquid injection, a battery and an electrical device.

[0004] In order to solve the above technical problems, the utility model provides a battery cell, including a shell and an electrode assembly arranged in the shell, the shell is provided with a liquid injection structure, and the liquid injection structure includes:

[0005] A liquid injection hole, arranged on the shell;

[0006] A blocking member, disposed in the housing, for closing and opening the injection hole;

[0007] an elastic member, disposed in the housing and connected to the inner wall of the housing and the blocking member, the elastic member being used to apply an elastic force to the blocking member close to the injection hole;

[0008] Among them, in the first working state, when the external pressure applied to the battery cell is greater than a first set value, the sealing member moves away from the injection hole under the action of the external pressure to open the injection hole; in the second working state, when the external pressure is less than or equal to the first set value, the sealing member moves close to the injection hole under the action of the elastic member to close the injection hole.

[0009] Furthermore, the blocking member includes a large-diameter end and a small-diameter end that are arranged opposite to each other, and a conical surface connected between the large-diameter end and the small-diameter end, and the small-diameter end is arranged close to the injection hole.

[0010] Furthermore, the blocking member further comprises an exhaust hole, wherein a first end of the exhaust hole is arranged at a portion of the conical surface close to the small diameter end, and a second end of the exhaust hole is arranged at a portion of the conical surface close to the large diameter end or at an end surface of the large diameter end;

[0011] The inner side wall of the liquid injection hole is provided with an elastic sealing portion;

[0012] Wherein, in the first working state, the elastic sealing portion is in sealing contact with the blocking member, and the first end is located at a side of the elastic sealing portion away from the injection hole;

[0013] In the third working state, the internal pressure of the battery cell is greater than a second set value, and the blocking member approaches and presses the elastic sealing portion, so that the first end and the second end are respectively located on two sides of the elastic sealing portion.

[0014] Furthermore, the exhaust holes are provided in plurality, and the plurality of exhaust holes are evenly arranged around the center line of the conical surface.

[0015] Furthermore, the shell is provided with a through hole penetrating the inner surface and the outer surface thereof, a hole sleeve is provided in the through hole, and the inner hole of the hole sleeve is the liquid injection hole.

[0016] Furthermore, one end of the hole sleeve facing the outside of the battery extends radially outward to form an annular flange, and the annular flange fits the outer surface of the shell.

[0017] Furthermore, the end of the sealing member facing away from the injection hole is also connected to a push plate structure, and the edge of the push plate structure protrudes from the sealing member. In the fourth working state, the internal pressure of the battery is greater than the second set internal pressure, and the second set internal pressure is greater than the first set internal pressure. The push plate structure contacts the hole sleeve and pushes the hole sleeve to the outside of the battery and away from the outer shell.

[0018] Furthermore, the elastic member includes a plurality of elastic arms, which are arranged around the blocking member, one end of each of the elastic arms is connected to the inner wall of the shell, and the other end of each of the elastic arms is connected to the large diameter end of the blocking member.

[0019] The utility model also discloses a battery, comprising the battery monomer.

[0020] The utility model also discloses an electric device, comprising the battery monomer or the battery.

[0021] The above technical solution of the utility model has the following advantages compared with the prior art:

[0022] 1) The battery cell, battery and electrical device described in the utility model are provided with a plugging member and an elastic member. In the first working state, no liquid replenishment is required. The elastic force of the elastic member forces the plugging member to close the liquid injection hole. The plugging member reliably closes the liquid injection hole under the elastic force of the elastic member. In the second working state, liquid replenishment is required. By applying an external force to the plugging member, the plugging member overcomes the elastic force of the elastic member under the action of the external force. The plugging member can relatively easily open the liquid injection hole to achieve liquid replenishment. In this way, the battery can be repeatedly filled with liquid, and external moisture can be prevented from entering the battery, thereby ensuring that the battery performance is not affected.

[0023] 2) In the battery cell, battery and electrical device described in the utility model, the plugging member is provided with a conical surface. In the first working state, the conical surface abuts against the injection hole under the elastic force of the elastic member, which can ensure that the plugging member has a better sealing effect on the injection hole;

[0024] 3) The battery cell, battery and electrical device described in the utility model are provided with the exhaust hole and the elastic sealing part. On the one hand, in the first working state, the plugging member abuts against the elastic sealing part of the injection hole, which can ensure that the plugging member has a better sealing effect on the injection hole. On the other hand, in the third working state, the elastic sealing part can be deformed, so that the relative position of the plugging member and the elastic sealing part can be further changed, and then the relative position of the first end of the exhaust hole and the elastic sealing part can be changed, so as to achieve pressure relief and exhaust, and improve the safety performance of the battery;

[0025] 4) The battery cell, battery and electrical device described in the utility model have multiple exhaust holes, which can quickly exhaust gas when the internal pressure of the battery is high, further improving the safety performance of the battery;

[0026] 5) The battery cell, battery and electrical device described in the utility model, by providing a hole sleeve, uses the inner hole of the hole sleeve as the injection hole. On the one hand, there is no need to change the original design of the shell. On the other hand, without changing the shell, the size and shape of the injection hole can be designed as needed. The injection hole is designed to be larger, which can improve the injection efficiency. Moreover, the shell and the hole sleeve of the battery are separated structures. When the pressure inside the battery is too large to a certain extent, the hole sleeve can be separated from the shell to achieve rapid pressure relief, further improving the safety performance of the battery.

[0027] 6) The battery cell, battery and electrical device described in the utility model have flanges on the hole sleeve, which, on the one hand, can provide a good sealing connection between the hole sleeve and the shell, and on the other hand, the hole sleeve will not fall into the shell, and while ensuring the reliability of the connection between the hole sleeve and the shell, ensure that the hole sleeve can be separated from the shell;

[0028] 7) The battery cell, battery and electrical device described in the utility model are provided with a push plate structure. When the internal pressure of the battery is relatively large, the push plate structure contacts the hole sleeve to ensure that the hole sleeve is subjected to axial force, thereby smoothly separating from the shell;

[0029] 8) In the battery cell, battery and electrical device described in the present invention, the elastic member includes a plurality of elastic arms, which can ensure that the sealing member is subjected to a balanced and reliable elastic force. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments of the utility model in combination with the accompanying drawings.

[0031] Figure 1 It is a top view of the liquid injection structure and the housing connected together according to the first embodiment of the utility model;

[0032] Figure 2 This is a front view of the liquid injection structure and the housing connected together in the first embodiment of the utility model;

[0033] Figure 3 A bottom view of the liquid injection structure and the housing connected together according to the first embodiment of the utility model;

[0034] Figure 4 This is a front view of the blocking member disclosed in the first embodiment of the utility model;

[0035] Figure 5 It is a top view of the blocking member disclosed in the first embodiment of the utility model;

[0036] Figure 6 It is a schematic diagram of a battery cell disclosed in the first embodiment of the utility model when it is in a first state;

[0037] Figure 7 It is a schematic diagram of the battery cell disclosed in the first embodiment of the present utility model when it is in the second state;

[0038] Figure 8 It is a schematic diagram of the relative position change of the liquid injection hole and the blocking member when the battery cell disclosed in the first embodiment of the utility model is in the third state.

[0039] Explanation of the reference numerals in the drawings in the specification: 1. outer shell; 11. shell body; 12. top cover; 13. lower plastic; 14. pole; 2. electrode assembly; 21. pole ear; 22. adapter; 3. liquid injection structure; 31. liquid injection hole; 32. sealing member; 33. elastic member; 331. elastic arm; 34. exhaust hole; 35. elastic sealing part; 36. hole sleeve; 37. annular flange; 38. push plate structure; 4. electrolyte; 5. liquid injection tube. DETAILED DESCRIPTION

[0040] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0041] See also Figures 1 to 8 The figure shows an embodiment of the battery cell disclosed in the present utility model.

[0042] The battery cell comprises a housing 1 and an electrode assembly 2 disposed in the housing 1. The housing 1 is provided with a liquid injection structure 3. The liquid injection structure 3 comprises:

[0043] A liquid injection hole 31 is provided in the housing 1;

[0044] A blocking member 32 is disposed in the housing 1 and is used to close and open the injection hole 31;

[0045] An elastic member 33 is disposed in the housing 1 and connected to the inner wall of the housing 1 and the blocking member 32. The elastic member 33 is used to apply an elastic force to the blocking member 32 near the injection hole 31;

[0046] Among them, in the first working state, when the external pressure applied to the above-mentioned battery cell is greater than the first set value, the above-mentioned sealing member 32 moves away from the above-mentioned injection hole 31 under the action of the above-mentioned external pressure to open the above-mentioned injection hole 31; in the second working state, when the above-mentioned external pressure is less than or equal to the above-mentioned first set value, the above-mentioned sealing member 32 approaches the above-mentioned injection hole 31 under the action of the above-mentioned elastic member 33 to close the above-mentioned injection hole 31.

[0047] The battery cell is the basic component unit of the power battery, which refers to an independent battery with a certain capacity and voltage. It mainly includes a shell 1, an electrode assembly 2 and an electrolyte 4. The shell 1 generally includes a shell 11 and a top cover 12. The shell 11 has an inner cavity with one end open, and the top cover 12 blocks the open mouth of the inner cavity. The inner side of the top cover 12 is provided with a lower plastic 13, and a pole 14 is installed on the top cover 12; the above-mentioned electrode assembly 2 includes a positive electrode, a negative electrode and a diaphragm. The electrode assembly 2 leads to a pole ear 21, and the pole ear 21 is connected to the pole 14 through an adapter 22; the above-mentioned injection structure 3 is installed on the shell 1. Specifically in this embodiment, the injection structure 3 is arranged on the top cover 12. The above-mentioned injection hole 31 is a through hole connecting the inside and outside of the battery cell, which is used to inject electrolyte from the outside of the battery cell into the inside of the shell 11. The above-mentioned blocking member 32 is arranged inside the shell 1 and abuts against the injection hole 31. The elastic member 33 is a member that can be deformed and restored. The elastic member 33 is deformed under the action of external force, and when the external force disappears, the elastic member 33 restores its shape. One end of the elastic member 33 is relatively fixed to the housing 1 (specifically, in this embodiment, one end of the elastic member is relatively fixed to the top cover 12), and the other end of the elastic member 33 is connected to the blocking member 32, and a force is applied to the blocking member 32 to drive it to move outside the housing 11 (close to the injection hole 31). The external pressure refers to the force on the blocking member 32 that drives it to move inside the housing 11 (out of the injection hole). In the second working state, electrolyte is injected into the injection hole 31 through the injection tube 5.

[0048] Through the above technical solution: by setting the plugging member 32 and the elastic member 33, in the first working state, no liquid replenishment is required, and the elastic force of the elastic member 33 forces the plugging member 32 to close the injection hole, and the plugging member 32 reliably closes the injection hole 31 under the elastic force of the elastic member 33. In the second working state, liquid replenishment is required, and by applying external force to the plugging member 32, the plugging member 32 overcomes the elastic force of the elastic member 33 under the action of the external force, and the plugging member 32 can relatively easily open the injection hole 31 to achieve liquid replenishment. In this way, the battery can be repeatedly injected with liquid, and it can also be ensured that external moisture will not enter the battery, ensuring that the battery performance is not affected.

[0049] In this embodiment, the blocking member 32 includes a large diameter end and a small diameter end that are relatively arranged, and a conical surface connected between the large diameter end and the small diameter end, and the small diameter end is arranged close to the injection hole 31.

[0050] The above-mentioned blocking member 32 is in the shape of a truncated cone or a cone or other shapes with a tapered surface. The small diameter end and the large diameter end of the above-mentioned blocking member 32 are flat surfaces or curved surfaces or other shapes, without limitation. Specifically in this embodiment, the above-mentioned blocking member 32 is in the shape of a truncated cone.

[0051] Through the above technical solution: the blocking member 32 is provided with a conical surface, and in the first working state, the conical surface abuts against the injection hole 31 under the elastic force of the elastic member 33, which can ensure that the blocking member 32 has a better sealing effect on the injection hole 31.

[0052] In this embodiment, the blocking member 32 further includes an exhaust hole 34, a first end of the exhaust hole 34 is disposed at a portion of the conical surface close to the small diameter end, and a second end of the exhaust hole 34 is disposed at a portion of the conical surface close to the large diameter end or at an end surface of the large diameter end (specifically in this embodiment, the second end of the exhaust hole 34 is disposed at a portion of the conical surface close to the large diameter end);

[0053] The inner wall of the injection hole 31 is provided with an elastic sealing portion 35;

[0054] Wherein, in the first working state, the elastic sealing portion 35 is in sealing contact with the blocking member 32, and the first end is located at a side of the elastic sealing portion 35 away from the injection hole 31;

[0055] In the third working state, the internal pressure of the battery cell is greater than the second set value, and the blocking member 32 approaches and presses the elastic sealing portion 35 , so that the first end and the second end are respectively located at two sides of the elastic sealing portion 35 .

[0056] The exhaust hole 34 is a fluid channel, and the elastic sealing part 35 is a sealing ring, such as a rubber ring. The side of the elastic sealing part 35 away from the injection hole 31 refers to the side of the elastic sealing part 35 facing the inside of the battery, and the two sides of the elastic sealing part 35 refer to the two sides of the elastic sealing part 35 facing the inside of the battery and the outside of the battery. In the first working state, the plugging member 32 isolates the inside of the battery from the outside of the battery. The first end and the second end of the exhaust hole 34 are both located on the side of the elastic sealing part 35 away from the injection hole 31. At this time, the first end and the second end of the exhaust hole 34 are both connected to the inside of the battery. Therefore, the inside of the battery and the outside of the battery remain isolated from each other. In the second working state, the plugging member 32 presses the elastic sealing part 35 toward the outside of the battery, so that the exhaust hole 34 moves to the side of the elastic sealing part 35 facing the outside of the battery, the first end of the exhaust hole 34 is connected to the outside of the battery, and the second end of the exhaust hole 34 is connected to the inside of the battery, so that the inside and the outside of the battery are connected. When the gas pressure inside the battery decreases, the blocking member 32 returns to the first working state under the action of its own weight and the elastic member 33 .

[0057] Through the above technical solution: by setting the exhaust hole 34 and the elastic sealing part 35, on the one hand, in the first working state, the sealing member 32 abuts against the elastic sealing part 35 of the injection hole 31, which can ensure that the sealing effect of the sealing member 32 on the injection hole 31 is better; on the other hand, in the third working state, the elastic sealing part 35 can be deformed, so as to continue to change the relative position of the sealing member 32 and the elastic sealing part 35, and then change the relative position of the first end of the exhaust hole 34 and the elastic sealing part 35, so as to realize pressure relief and exhaust, have the function of an explosion-proof valve, and improve the safety performance of the battery.

[0058] In this embodiment, the exhaust hole 34 is provided in plurality, and the plurality of exhaust holes 34 are evenly arranged around the center line of the conical surface.

[0059] A plurality of exhaust holes 34 are provided on the same sealing member 32. In the third working state, the plurality of exhaust holes 34 are connected to the inside and the outside of the battery at the same time, so that the exhaust volume is large and the air pressure inside the battery can be discharged quickly.

[0060] Through the above technical solution: a plurality of exhaust holes 34 are provided, which can quickly exhaust gas when the internal pressure of the battery is high, further improving the safety performance of the battery.

[0061] In this embodiment, the housing 1 is provided with a through hole penetrating the inner surface and the outer surface thereof, a hole sleeve 36 is provided in the through hole, and the inner hole of the hole sleeve 36 is the liquid injection hole 31 .

[0062] The hole sleeve 36 is a hollow pipe installed in the through hole of the shell 1, and the electrolyte 4 is injected into the battery through the hole sleeve 36. The length of the hole sleeve 36 can be greater than the wall thickness of the shell 1, so as to facilitate the structural design of the injection structure.

[0063] Through the above technical solution: by setting the hole sleeve 36, the inner hole of the hole sleeve 36 is used as the injection hole 31. On the one hand, there is no need to change the original design of the shell 1. On the other hand, without changing the shell 1, the size and shape of the injection hole 31 can be designed as needed. The injection hole is designed to be larger, which can improve the injection efficiency. Moreover, the shell 1 of the battery and the hole sleeve 36 are split structures. When the pressure inside the battery is too high to a certain extent, the hole sleeve 36 can be separated from the shell 1 to achieve rapid pressure relief, thereby further improving the safety performance of the battery.

[0064] In this embodiment, one end of the hole sleeve 36 facing the outside of the battery extends radially outward to form an annular flange 37 , and the annular flange 37 fits the outer surface of the housing 1 .

[0065] The hole sleeve 36 comprises a coaxially arranged cylindrical portion and an annular plate portion, the annular plate portion has an inner edge and an outer edge, the inner edge of the annular plate portion is connected to one end of the cylindrical portion, and the annular plate portion is an annular flange 37. The cylindrical portion is inserted into the through hole of the housing 1, and the annular flange is attached to the outer wall surface of the housing 1.

[0066] Through the above technical solution: the hole sleeve is provided with a flange, on the one hand, the hole sleeve 36 and the shell 1 can be better sealed and connected, on the other hand, the hole sleeve will not fall into the inside of the shell, and while ensuring the reliability of the connection between the hole sleeve and the shell, it is ensured that the hole sleeve can be separated from the shell.

[0067] In this embodiment, the end of the sealing member 32 facing away from the injection hole 31 is also connected to a push plate structure 38, and the edge of the push plate structure 38 protrudes from the sealing member. In the fourth working state, the internal pressure of the battery is greater than the second set internal pressure, and the second set internal pressure is greater than the first set internal pressure. The push plate structure 38 contacts the hole sleeve 36 and pushes the hole sleeve 36 to the outside of the battery and away from the outer shell 1.

[0068] The large diameter end of the plugging member 32 is connected to a push plate structure 38, which is plate-shaped and has an outer edge protruding from the outer side of the plugging member 32. When the plugging member 32 completely enters the injection hole 31, the push plate structure 38 contacts the hole sleeve 36 of the battery.

[0069] Through the above technical solution: by setting the push plate structure 38, when the internal pressure of the battery is relatively large, the push plate structure 38 contacts the hole sleeve 36 to ensure that the hole sleeve 36 is subjected to axial force, so that the hole sleeve 36 can be smoothly separated from the shell 1.

[0070] In this embodiment, the elastic member 33 includes a plurality of elastic arms 331, which are arranged around the sealing member 32, one end of each of the elastic arms 331 is connected to the inner wall of the outer shell 1, and the other end of each of the elastic arms 331 is connected to the large diameter end of the sealing member.

[0071] The elastic arm 331 is rope-shaped, one end of which is connected to the blocking member 32 and the other end is connected to the housing 1. The multiple elastic arms 331 enable the blocking member 32 to maintain a first working state in a natural state, a second working state under external force of the battery, and a third working state under internal force of the battery.

[0072] Through the above technical solution: the elastic member 33 includes a plurality of elastic arms 331, which can ensure that the blocking member 32 is subjected to a balanced and reliable elastic force.

[0073] The utility model also provides a battery, comprising the above-mentioned battery monomer.

[0074] The battery includes one or more battery cells. The one or more battery cells of the battery are used to supply power to the outside.

[0075] The utility model also provides an electric device, which can be a car, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The car can be a fuel car, a gas car or a new energy car, and the new energy car can be a pure electric car, a hybrid car or an augmented program car, etc.; the spacecraft includes airplanes, rockets, space shuttles and spacecrafts, etc.; the electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc.; the electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc. The embodiments of the present application do not impose special restrictions on the above-mentioned electric devices.

[0076] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention of the utility model.

Claims

1. A battery cell, comprising a housing (1) and an electrode assembly (2) arranged in the housing (1), characterized in that: The housing (1) is provided with a liquid injection structure, and the liquid injection structure comprises: A liquid injection hole (31) provided on the housing (1); A blocking member (32) is disposed in the housing (1) and is used to close and open the liquid injection hole (31); an elastic member (33) disposed in the housing (1) and connected to the inner wall of the housing (1) and the blocking member (32), the elastic member (33) being used to exert an elastic force on the blocking member (32) close to the injection hole (31); Wherein, in a first working state, when the external pressure applied to the battery cell is greater than a first set value, the blocking member (32) moves away from the injection hole (31) under the action of the external pressure to open the injection hole (31); in a second working state, when the external pressure is less than or equal to the first set value, the blocking member (32) moves closer to the injection hole (31) under the action of the elastic member (33) to close the injection hole (31).

2. The battery cell according to claim 1, characterized in that: The blocking member (32) comprises a large diameter end and a small diameter end which are arranged opposite to each other, and a conical surface connected between the large diameter end and the small diameter end, and the small diameter end is arranged close to the injection hole (31).

3. The battery cell according to claim 2, characterized in that: The blocking member (32) further comprises an exhaust hole (34), wherein a first end of the exhaust hole (34) is arranged at a portion of the conical surface close to the small diameter end, and a second end of the exhaust hole (34) is arranged at a portion of the conical surface close to the large diameter end or at an end surface of the large diameter end; The inner side wall of the liquid injection hole (31) is provided with an elastic sealing portion; Wherein, in the first working state, the elastic sealing portion (35) is in sealing contact with the blocking member (32), and the first end is located on a side of the elastic sealing portion (35) away from the liquid injection hole (31); In a third working state, the internal pressure of the battery cell is greater than a second set value, and the blocking member (32) approaches and presses the elastic sealing portion (35), so that the first end and the second end are respectively located on both sides of the elastic sealing portion (35).

4. The battery cell according to claim 3, characterized in that: The exhaust holes (34) are provided in plurality, and the plurality of exhaust holes (34) are evenly arranged around the center line of the conical surface.

5. The battery cell according to claim 3, characterized in that: The housing (1) is provided with a through hole penetrating the inner surface and the outer surface thereof, a hole sleeve (36) is provided in the through hole, and the inner hole of the hole sleeve (36) is the liquid injection hole (31).

6. The battery cell according to claim 5, characterized in that: One end of the hole sleeve (36) facing the outside of the battery extends radially outward to form an annular flange (37), and the annular flange (37) fits the outer surface of the housing (1).

7. The battery cell according to claim 5, characterized in that: The end of the sealing member (32) facing away from the injection hole is also connected to a push plate structure (38), and the edge of the push plate structure (38) protrudes from the sealing member. In a fourth working state, the internal pressure of the battery is greater than the second set internal pressure, and the second set internal pressure is greater than the first set internal pressure. The push plate structure (38) contacts the hole sleeve (36) and pushes the hole sleeve (36) to separate from the outer shell (1) toward the outside of the battery.

8. The battery cell according to any one of claims 2 to 7, characterized in that: The elastic member (33) comprises a plurality of elastic arms (331), the plurality of elastic arms (331) being arranged around the blocking member (32), one end of each of the elastic arms (331) being connected to the inner wall of the outer shell (1), and the other end of each of the elastic arms (331) being connected to the large diameter end of the blocking member.

9. A battery, characterized in that: A battery cell comprising any one of claims 1 to 8.

10. An electrical device, characterized in that: It comprises the battery cell according to any one of claims 1 to 8 or the battery according to claim 9.

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