Sealing nail, cover plate assembly and battery cell

Abstract

The utility model provides a sealing nail, a cover plate assembly and a battery cell, and the sealing nail comprises a nail body which is used for being matched with a liquid injection hole of the battery cell; the liquid supplementing hole is formed in the nail body, is communicated with the interior and the exterior of the battery cell and is used for injecting electrolyte into the battery cell; the exhaust hole is formed in the nail body, is spaced from the liquid supplementing hole, is communicated with the interior and the exterior of the battery cell, and is used for exhausting gas in the battery cell; the first sealing part is arranged on the nail body and has a first closing state for closing the liquid supplementing hole and a first opening state for opening the liquid supplementing hole; and the second sealing part is arranged on the nail body and has a second closing state for closing the exhaust hole and a second opening state for opening the exhaust hole. The sealing nail, the cover plate assembly and the battery cell provided by the utility model are simple in structure and convenient to manufacture, electrolyte can be quickly supplemented, the stability of the battery cell structure is ensured, and the cycle performance and the quick charging effect of the battery cell are improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of batteries, in particular to a sealing nail, a cover plate assembly and a battery cell. BACKGROUND

[0002] With the continuous development of the new energy industry, higher requirements are put forward for batteries, and the capacity of battery cells under the high-nickel high-silicon system is higher. The upper limit of the electrolyte injection amount in the hard shell battery cell is limited by the residual space in the shell. For battery cells with ultra-high energy density, more active lithium and more intensive reaction sites require more electrolyte.

[0003] After long-term cycling of the battery cell, excessive consumption of electrolyte will cause significant deterioration of the cycling performance and fast charging performance of the battery cell. It can be considered to supplement the electrolyte of the battery cell, but the existing battery cell is sealed by a sealing nail after electrolyte injection, and the electrolyte cannot be supplemented. If the sealing nail is forcibly removed and the electrolyte is supplemented through the injection port, the disassembly strength is large, and the battery cell structure is likely to be damaged, reducing the use safety. Therefore, a sealing nail that is more convenient for electrolyte supplement is urgently needed. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the purpose of the application is to provide a sealing nail, a cover plate assembly and a battery cell to solve the problems mentioned in the background art.

[0005] The first aspect of the application provides a sealing nail, comprising: a nail body configured to cooperate with an injection hole of a battery cell; a liquid supplementing hole provided on the nail body and communicating the inside and outside of the battery cell, configured to inject electrolyte into the inside of the battery cell; an exhaust hole provided on the nail body and spaced apart from the liquid supplementing hole, communicating the inside and outside of the battery cell, configured to exhaust the gas in the inside of the battery cell; a first sealing part provided on the nail body, having a first closed state of closing the liquid supplementing hole and a first open state of opening the liquid supplementing hole; and a second sealing part provided on the nail body, having a second closed state of closing the exhaust hole and a second open state of opening the exhaust hole.

[0006] Further, one end of the nail body is provided with a nail head plate, the liquid supplementing hole and the exhaust hole are provided on the nail head plate, the first sealing part is connected to one side of the nail head plate close to the inside of the battery cell, and the first spring is connected between the first sealing part and the nail head plate; the second sealing part is connected to one side of the nail head plate away from the inside of the battery cell, and the second spring is connected between the second sealing part and the nail head plate.

[0007] Further, the sealing spike further comprises: a liquid supplement cavity structure arranged in the spike body, a first through hole is arranged at one end close to the inside of the battery cell, the liquid supplement hole is arranged at one end away from the inside of the battery cell, the first sealing part is arranged in the liquid supplement cavity, and the first spring is connected between the first sealing part and the liquid supplement cavity structure; and an exhaust cavity structure arranged in the spike body and arranged separately from the liquid supplement cavity, the exhaust hole is arranged at one end close to the inside of the battery cell, the second through hole is arranged at one end away from the inside of the battery cell, the second sealing part is arranged in the exhaust cavity, and the second spring is connected between the second sealing part and the exhaust cavity structure.

[0008] Further, the first spring is connected to one end close to or away from the inside of the battery cell of the liquid supplement cavity structure, and the second spring is connected to one end close to or away from the inside of the battery cell of the exhaust cavity structure.

[0009] Further, one end of the spike body is provided with a spike head plate, the liquid supplement hole and the second through hole are arranged on the spike head plate, the inside of the spike body is provided with a partition plate and a baffle plate, the partition plate is arranged perpendicularly to the spike head plate, the baffle plate is arranged perpendicularly to the partition plate, the exhaust hole and the first through hole are arranged on the baffle plate, and the baffle plate, the spike head plate, the partition plate and the spike body form the liquid supplement cavity structure and the exhaust cavity structure.

[0010] Further, one end of the spike body is provided with a flange, the inside of the spike body is provided with a partition plate, the partition plate divides the inside of the spike body into at least two independent spaces, the first end plate and the second end plate are arranged in each independent space, the liquid supplement hole or the second through hole is arranged on the first end plate, and the exhaust hole or the first through hole is arranged on the second end plate, and the partition plate, the first end plate, the second end plate and the spike body form the liquid supplement cavity structure or the exhaust cavity structure.

[0011] Further, the length of the partition plate is equal to the length of the spike body, and the interval between the first end plate and the second end plate is less than or equal to the length of the spike body.

[0012] Further, the first end plate is arranged flush with the flange.

[0013] In a second aspect of the present application, a cover plate assembly is provided, comprising a cover plate body, the cover plate body is provided with a liquid injection hole, and the sealing spike as described in the first aspect above is arranged in the liquid injection hole.

[0014] In a third aspect of the present application, an electric cell is provided, comprising a shell, the shell is connected with the cover plate assembly as described in the second aspect above, and an electrode assembly is arranged in the inside of the shell.

[0015] As can be seen from the above, the sealing nail, the cover plate assembly and the battery provided by the application comprise: a nail body for cooperating with a liquid injection hole of a battery; a liquid supplement hole arranged on the nail body and communicating the inside and outside of the battery, for injecting electrolyte into the inside of the battery; an exhaust hole arranged on the nail body and arranged in a spaced manner with the liquid supplement hole, and communicating the inside and outside of the battery, for discharging the gas in the inside of the battery; a first sealing part arranged on the nail body and having a first closed state of closing the liquid supplement hole and a first opened state of opening the liquid supplement hole; and a second sealing part arranged on the nail body and having a second closed state of closing the exhaust hole and a second opened state of opening the exhaust hole. The liquid supplement hole is opened by the first sealing part, and the electrolyte is supplemented into the inside of the battery through the liquid supplement hole, without the need of disassembling the sealing nail as a whole, so that the operation is convenient and the structure of the battery is stable. The exhaust hole is opened by the second sealing part during the liquid supplement, and as the electrolyte is injected into the battery, the internal pressure is too high, the excess gas can be discharged to the outside of the battery through the exhaust hole, the internal pressure of the battery is balanced, and the safety and reliability of the battery are ensured. The sealing nail, the cover plate assembly and the battery have simple structures, are convenient to manufacture, can quickly supplement the electrolyte, ensure the stability of the structure of the battery, and improve the cycle performance and fast charging effect of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the application or the related art, the following will briefly introduce the drawings needed to be used in the embodiments or the related art description. Obviously, the drawings in the following description are only embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of a sealing nail in an embodiment of the application.

[0018] Figure 2 It is a schematic diagram of the cross section of the first sealing nail in an embodiment of the application.

[0019] Figure 3 It is a schematic diagram of the cross section of the second sealing nail in an embodiment of the application. Figure 2 It is a schematic diagram of the cross section of the sealing nail during liquid injection in an embodiment of the application.

[0020] Figure 4 It is a schematic diagram of the cross section of the third sealing nail in an embodiment of the application.

[0021] Figure 5 It is a schematic diagram of the cross section of the third sealing nail in an embodiment of the application.

[0022] Figure 6 It is a schematic diagram of the cross section of the fourth sealing nail in an embodiment of the application. Figure 5 It is a schematic diagram of the cross section of the sealing nail during liquid injection in an embodiment of the application.

[0023] Figure 7 It is a schematic diagram of the cross section of the fourth sealing nail in an embodiment of the application.

[0024] Figure 8 is a top view of a sealing nail in an embodiment of the present application; Figure 7 is a top view of a sealing nail in an embodiment of the present application;

[0025] Figure 9 is a top view of a sealing nail in an embodiment of the present application;

[0026] Figure 10 is a sectional view of a cover plate assembly in an embodiment of the present application;

[0027] Figure 11 is a cycle performance diagram of an electric core.

[0028] Reference signs: 1, nail body; 1-1, nail head plate; 1-2, flange; 1-3, baffle; 1-4, partition plate; 2, liquid supplementing hole; 3, exhaust hole; 4, first sealing part; 5, second sealing part; 6, first spring; 7, second spring; 8, liquid supplementing cavity structure; 9, exhaust cavity structure; 10, first through hole; 11, second through hole; 12, cover plate body; 12-1, liquid injection hole; 13, first end plate; 14, second end plate. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be understood as the usual meaning understood by those skilled in the art to which the present application belongs. The terms "first", "second" and the like used in the embodiments of the present application do not represent any order, number or importance, but are only used to distinguish different components. The terms "include" or "contain" and the like mean that the elements or objects before the terms cover the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connect" or "connected" and the like are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right" and the like are only used to represent relative positional relationships, and when the absolute positions of the described objects change, the relative positional relationships may also change accordingly.

[0031] With the continuous development of the new energy industry, higher requirements are put forward for batteries. The capacity of the electric core under the high-nickel high-silicon system is higher, and the upper limit of the electrolyte injection amount in the hard shell electric core is limited by the residual space in the shell. For the electric core with ultra-high energy density, more active lithium and more intensive reaction sites require more electrolyte.

[0032] After long-term cycling of the battery cell, excessive consumption of electrolyte will cause significant deterioration of the cycling performance and fast charging performance of the battery cell. The battery cell can be considered for electrolyte replenishment. However, the existing battery cell is sealed by a sealing nail after liquid injection, and the electrolyte cannot be replenished. If the sealing nail is forcibly removed and the electrolyte is replenished through the liquid injection port, the disassembly strength is large, and the battery cell structure is likely to be damaged, reducing the safety in use. Therefore, there is an urgent need for a sealing nail that can replenish electrolyte more conveniently.

[0033] Hereinafter, specific embodiments will be described below with reference to the accompanying drawings. Figures 1 to 11 The technical solutions of the present application will be described in further detail.

[0034] In some embodiments of the present application, a sealing nail is provided, as shown in Figure 1 and Figure 2 , comprising: a nail body 1 for cooperating with a liquid injection hole 12-1 of a battery cell; a liquid replenishing hole 2 provided on the nail body 1, communicating the inside and outside of the battery cell, for injecting electrolyte into the inside of the battery cell; an exhaust hole 3 provided on the nail body 1, spaced apart from the liquid replenishing hole 2, communicating the inside and outside of the battery cell, for exhausting the internal gas of the battery cell; a first sealing part 4 provided on the nail body 1, having a first closed state of closing the liquid replenishing hole 2 and a first open state of opening the liquid replenishing hole 2; a second sealing part 5 provided on the nail body 1, having a second closed state of closing the exhaust hole 3 and a second open state of opening the exhaust hole 3.

[0035] As shown in Figure 1 , the sealing nail comprises a nail body 1, and the material of the nail body 1 is, for example, rubber, as shown in Figure 11 , the nail body 1 can cooperate with the liquid injection hole 12-1 of the cover plate assembly for sealing.

[0036] The liquid replenishing hole 2 and the exhaust hole 3 are provided on the nail body 1, and the sizes can be the same or different, which are not limited; the liquid replenishing hole 2 is used for injecting electrolyte into the inside of the battery cell, and the exhaust hole 3 is used for exhausting the internal gas of the battery cell to avoid excessive pressure in the battery cell after liquid replenishment; the number of the liquid replenishing hole 2 and the exhaust hole 3 can be one or more, as shown in Figure 9 , a plurality of liquid replenishing holes 2 and exhaust holes 3 are alternately arranged on the nail body 1, which can improve the liquid replenishing rate and the exhaust effect.

[0037] As shown in Figure 2As shown, the nail body 1 is further provided with a first sealing part 4 and a second sealing part 5, for example, a rubber plug, a rubber block, etc., which are not limited in particular; the first sealing part 4 has a first closed state of closing the liquid supplement hole 2 and a first opened state of opening the liquid supplement hole 2, and the second sealing part 5 has a second closed state of closing the exhaust hole 3 and a second opened state of opening the exhaust hole 3; for example, the sealing part can be clamped in the liquid supplement hole 2 or the exhaust hole 3 to achieve the closed state, and after the sealing part is disassembled, the opened state is achieved, and for another example, the sealing part can be rotationally connected to the surface of the nail body 1, and when it is rotated to cover the liquid supplement hole 2 or the exhaust hole 3, the closed state is achieved, and when it is rotated to open the liquid supplement hole 2 or the exhaust hole 3, the opened state is achieved.

[0038] By opening the liquid supplement hole 2 through the first sealing part 4, the electrolyte is supplemented to the inside of the battery cell through the liquid supplement hole 2, and the sealing nail does not need to be disassembled as a whole, which is convenient to operate and ensures the stability of the battery cell structure; when supplementing the liquid, the exhaust hole 3 is opened through the second sealing part 5, and as the electrolyte is injected into the battery cell, the internal pressure is too high, and the excess gas can be discharged to the outside of the battery cell through the exhaust hole 3, thereby balancing the internal pressure of the battery cell and ensuring the safety and reliability of the battery cell.

[0039] The sealing nail has a simple structure, is easy to manufacture, can quickly supplement the electrolyte, ensures the stability of the battery cell structure, and improves the cycle performance and fast charging effect of the battery cell.

[0040] In some embodiments, as shown in Figure 2 and Figure 3 , one end of the nail body 1 is provided with a nail head plate 1-1, the nail head plate 1-1 is provided with the liquid supplement hole 2 and the exhaust hole 3, one side of the nail head plate 1-1 close to the inside of the battery cell is connected with the first sealing part 4, and the first sealing part 4 and the nail head plate 1-1 are connected with the first spring 6; one side of the nail head plate 1-1 away from the inside of the battery cell is connected with the second sealing part 5, and the second sealing part 5 and the nail head plate 1-1 are connected with the second spring 7.

[0041] As shown in Figure 2 , one end of the nail body 1 is provided with a nail head plate 1-1, for example, a round plate, which can be integrally formed with the nail body 1, the nail head plate 1-1 is provided with the liquid supplement hole 2 and the exhaust hole 3, the inner side of the nail head plate 1-1 is connected with the first sealing part 4, the first sealing part 4 and the nail head plate 1-1 are connected with the first spring 6, the outer side of the nail head plate 1-1 is connected with the second sealing part 5, and the second sealing part 5 and the nail head plate 1-1 are connected with the second spring 7; in the normal state, the sealing parts are in the closed state, as shown in Figure 3As shown, when the pressure is applied to supplement the liquid, the first sealing part 4 is pressed open, so that the electrolyte can be supplemented into the battery, the first spring 6 is stretched, and as the electrolyte occupies the residual space, the internal gas pressure rises, the second sealing part 5 is also pressed open, so that the gas can be automatically discharged to the outside of the battery, and the pressure is balanced, and at this time the second spring 7 is also stretched; after the liquid supplementing is completed, the first spring 6 resets, so that the first sealing part 4 is in a closed state, and after the internal gas pressure decreases, the second spring 7 resets, so that the second sealing part 5 is also in a closed state, ensuring that the inside and outside of the battery are isolated, and the automatic opening and closing of the sealing part can be realized, the sealing effect is good, and the operation is also more convenient.

[0042] In some embodiments, as shown in Figure 4 and Figure 5 , the sealing spike further comprises: a liquid supplementing cavity structure 8 arranged in the spike body 1, a first through hole 10 is arranged at one end close to the inside of the battery, and the liquid supplementing hole 2 is arranged at one end away from the inside of the battery, the first sealing part 4 is arranged in the liquid supplementing cavity, and the first spring 6 is connected between the first sealing part 4 and the liquid supplementing cavity structure 8; an exhaust cavity structure 9 is arranged in the spike body 1 and is arranged separately from the liquid supplementing cavity, the exhaust hole 3 is arranged at one end close to the inside of the battery, the second through hole 11 is arranged at one end away from the inside of the battery, the second sealing part 5 is arranged in the exhaust cavity, and the second spring 7 is connected between the second sealing part 5 and the exhaust cavity structure 9.

[0043] As shown in Figure 4 , the sealing spike further comprises a liquid supplementing cavity structure 8 and an exhaust cavity structure 9, so that the sealing part can be arranged in the cavity structure, plays a protective role, and ensures the flatness of the installation of the spike body 1 on the cover plate assembly; the first through hole 10 is arranged on the inside of the liquid supplementing cavity structure 8, and the liquid supplementing hole 2 is arranged on the outside, so that after the first sealing part 4 opens the liquid supplementing hole 2, the liquid can be supplemented into the battery through the first through hole 10; similarly, the exhaust hole 3 is arranged on the inside of the exhaust cavity structure 9, and the second through hole 11 is arranged on the outside, so that after the second sealing part 5 opens the exhaust hole 3, the gas can be exhausted to the outside of the battery through the second through hole 11.

[0044] In some embodiments, as shown in Figure 4 and Figure 5 , the first spring 6 is connected to one end close to or away from the inside of the battery of the liquid supplementing cavity structure 8, and the second spring 7 is connected to one end close to or away from the inside of the battery of the exhaust cavity structure 9.

[0045] As shown in Figure 4 , the first spring 6 is connected to one end away from the inside of the battery of the liquid supplementing cavity structure 8, and the second spring 7 is connected to one end close to the inside of the battery of the exhaust cavity structure 9, and the working principles of the first spring 6 and the second spring 7 are the same as those described in the foregoingFigure 2 and Figure 3 work similarly, and are not described here.

[0046] As shown in Figure 5 , the first spring 6 is connected to one end of the liquid supplementing cavity structure 8 close to the inside of the battery cell, and the second spring 7 is connected to one end of the gas discharging cavity structure 9 away from the inside of the battery cell. This arrangement is simple in structure and has better sealing effect. In the normal state, the sealing parts are in the closed state, as shown in Figure 6 , when pressurized liquid supplementing is performed, the first sealing part 4 is pressed and opened, so that the electrolyte can be supplemented into the inside of the battery cell. At this time, the first spring 6 is compressed, and as the electrolyte occupies the residual space, the internal gas pressure rises, the second sealing part 5 is also pressed and opened, so that the gas can be automatically discharged to the outside of the battery cell to balance the pressure. At this time, the second spring 7 is also compressed. After the liquid supplementing is completed, the first spring 6 resets, so that the first sealing part 4 is in the closed state. After the internal gas pressure decreases, the second spring 7 resets, so that the second sealing part 5 is also in the closed state, ensuring that the inside and outside of the battery cell are isolated. This method can realize automatic opening and closing of the sealing part, has good sealing effect, and is more convenient to operate.

[0047] In some embodiments, as shown in Figure 4 and Figure 5 , one end of the nail body 1 is provided with a nail head plate 1-1, and the nail head plate 1-1 is provided with the liquid supplementing hole 2 and the second through hole 11. The inside of the nail body 1 is provided with a partition plate 1-4 and a baffle plate 1-3. The partition plate 1-4 is perpendicular to the nail head plate 1-1, and the baffle plate 1-3 is perpendicular to the partition plate 1-4. The baffle plate 1-3 is provided with the gas discharging hole 3 and the first through hole 10. The baffle plate 1-3, the nail head plate 1-1, the partition plate 1-4, and the nail body 1 form the liquid supplementing cavity structure 8 and the gas discharging cavity structure 9.

[0048] As shown in Figure 4 , one end of the nail body 1 is provided with a nail head plate 1-1, and the inside of the nail body 1 is provided with a partition plate 1-4 and a baffle plate 1-3. The nail head plate 1-1 and the baffle plate 1-3 are, for example, round plates, and the partition plate 1-4 is, for example, a rectangular plate. They can be connected by bonding, and the specific connection mode is not limited. The baffle plate 1-3, the nail head plate 1-1, the partition plate 1-4, and the nail body 1 can simultaneously form the liquid supplementing cavity structure 8 and the gas discharging cavity structure 9, which is simple in structure and convenient to manufacture.

[0049] In some embodiments, as shown in Figure 7 and Figure 8As shown, one end of the nail body 1 is provided with a flange 1-2, and the interior of the nail body 1 is provided with a partition 1-4. The partition 1-4 divides the interior of the nail body 1 into at least two independent spaces. Each independent space is embedded with a spaced first end plate 13 and a second end plate 14. The first end plate 13 is provided with the liquid replenishment hole 2 or the second through hole 11, and the second end plate 14 is provided with the vent hole 3 or the first through hole 10. The partition 1-4, the first end plate 13, the second end plate 14 and the nail body 1 form the liquid replenishment cavity structure 8 or the venting cavity structure 9.

[0050] like Figure 7 As shown, one end of the nail body 1 is provided with a flange 1-2, and the interior of the nail body 1 is provided with a partition 1-4. The partition 1-4 is, for example, a rectangular plate, which divides the interior of the nail body 1 into at least two independent spaces, for example, semi-cylindrical spaces. Each independent space is embedded with a spaced first end plate 13 and a second end plate 14, as shown. Figure 8 As shown, the end plate is, for example, a semi-circular plate. The partition 1-4, the first end plate 13, the second end plate 14 and the nail body 1 can form a liquid filling cavity structure 8 or a venting cavity structure 9. The cavity structure formed in this way is easy to assemble and has good sealing performance.

[0051] In some embodiments, such as Figure 7 As shown, the length of the partition 1-4 is equal to the length of the nail body 1, and the distance between the first end plate 13 and the second end plate 14 is less than or equal to the length of the nail body 1.

[0052] like Figure 7 As shown, the length of partition 1-4 is equal to the length of nail body 1, ensuring the structural stability of the sealing nail; the distance between the first end plate 13 and the second end plate 14 is less than the length of nail body 1, facilitating installation.

[0053] In some embodiments, such as Figure 7 As shown, the first end plate 13 is flush with the flange 1-2.

[0054] The first end plate 13 is flush with the flange 1-2 to ensure flatness after assembly with the cover plate assembly.

[0055] In some embodiments of this application, a cover plate assembly is provided, such as... Figure 10 As shown, it includes a cover plate body 12, on which a liquid injection hole 12-1 is provided, and a sealing nail as described in any of the above embodiments is installed in the liquid injection hole 12-1.

[0056] The cover plate body 12 is, for example, an aluminum plate, and the cover plate body 12 can be provided with a liquid injection hole 12-1 penetrating the cover plate body 12, for injecting electrolyte into the inside of the cover plate assembly. After the liquid injection, a sealing pin can be embedded in the liquid injection hole 12-1 for sealing. When the battery cell is used for a certain period of time, electrolyte can be supplemented through the supplement hole 2 of the sealing pin, and the internal pressure of the battery cell can be balanced through the exhaust hole 3, thereby further improving the service life of the battery cell.

[0057] The cover plate body 12 can be provided with an explosion-proof hole. When the cover plate assembly is in thermal runaway, high-temperature gas can be discharged from the cover plate assembly through the explosion-proof hole, thereby avoiding explosion.

[0058] The cover plate body 12 can be provided with a pole at both ends, for example, including a positive pole and a negative pole. One end of the pole is located below the cover plate body 12 and is used for electrical connection with the electrode assembly in the battery cell shell. The other end of the pole is located above the cover plate body 12 and is used for electrical connection with the external circuit of the cover plate assembly.

[0059] The cover plate assembly has a simple structure and is convenient for supplementing electrolyte to the battery cell.

[0060] In some embodiments of the present application, a battery cell is provided, which includes a shell connected with the cover plate assembly as described in any of the above embodiments, and an electrode assembly arranged inside.

[0061] The shell is, for example, an aluminum shell, which can be welded to the cover plate assembly. The battery cell has a simple structure, is convenient to manufacture, has a long service life, and has good fast charging effect.

[0062] The battery cell can be applied to an electrical equipment, which can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, and an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile, or a range extended automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, such as a game machine, an electric automobile toy, an electric ship toy, and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool, and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator, and an electric planer, etc.

[0063] Comparative Example 1

[0064] After the electrolyte is injected into the battery cell, the injection hole 12-1 is sealed by the common sealing nail, and the battery cell is subjected to a 25℃ cycle performance test. The charge and discharge cycle mode is 1C / 1C, the voltage range is 2.5V-3.65V, the discharge capacity of the first complete charge and discharge is taken as the reference, the capacity retention rate after multiple cycles is counted, and the electrolyte is not supplemented during the test. The test results are shown in Figure 11 As can be seen, the capacity retention rate of the battery cell is reduced to below 80% at 800 cycles.

[0065] Example 1

[0066] After the electrolyte is injected into the battery cell, the injection hole 12-1 is sealed by the common sealing nail, and the battery cell is subjected to a 25℃ cycle performance test. The charge and discharge cycle mode is 1C / 1C, the voltage range is 2.5V-3.65V, the discharge capacity of the first complete charge and discharge is taken as the reference, the capacity retention rate after multiple cycles is counted, and the electrolyte is not supplemented during the test. The test results are shown in Figure 11 As can be seen, the capacity retention rate of the battery cell is reduced to below 80% at 800 cycles.

[0067] Those skilled in the art should understand that the above discussion of any embodiment is only exemplary and is not intended to limit the scope of the present application (including claims) to these examples; the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes to the different aspects of the embodiments of the present application as described above. In order to be brief, they are not provided in detail.

[0068] In addition, although the details have been described to describe the exemplary embodiments of the present application, it is obvious to those skilled in the art that the embodiments of the present application can be implemented without these details or with changes to these details. Therefore, these descriptions should be considered as illustrative rather than limiting.

[0069] Although the present application has been described in conjunction with the embodiments thereof, many alternatives, modifications, and variations will be apparent to those skilled in the art in light of the foregoing description.

[0070] The embodiments of the present application are intended to cover all such alternatives, modifications, and variations which fall within the broad scope of the appended claims. Accordingly, any omission, modification, equivalent replacement, improvement, etc. made in the spirit and principle of the embodiments of the present application should be included in the protection scope of the present application.

Claims

1. A sealing spike, characterized in that, The application relates to a liquid supplementing and exhausting device for a lithium ion battery. The device comprises: a nail body for matching with a liquid injection hole of a battery cell; a liquid supplementing hole arranged on the nail body and communicating with the inside and outside of the battery cell, for injecting electrolyte into the inside of the battery cell; an exhaust hole arranged on the nail body and spaced from the liquid supplementing hole, for exhausting gas in the inside of the battery cell; a first sealing part arranged on the nail body and having a first closed state for closing the liquid supplementing hole and a first opened state for opening the liquid supplementing hole; 2. The seal spike of claim 1, wherein, a second sealing part arranged on the nail body and having a second closed state for closing the exhaust hole and a second opened state for opening the exhaust hole.

3. The seal spike of claim 1, wherein, One end of the nail body is provided with a nail head plate, the nail head plate is provided with the liquid supplementing hole and the exhaust hole, the nail head plate is connected with the first sealing part on the side close to the inside of the battery cell, and the first sealing part and the nail head plate are connected with a first spring; the nail head plate is connected with the second sealing part on the side far away from the inside of the battery cell, and the second sealing part and the nail head plate are connected with a second spring. The device further comprises: a liquid supplementing cavity structure arranged in the nail body, one end close to the inside of the battery cell is provided with a first through hole, and one end far away from the inside of the battery cell is provided with the liquid supplementing hole; the inside of the liquid supplementing cavity is provided with the first sealing part, and the first sealing part and the liquid supplementing cavity structure are connected with the first spring; 4. The seal spike of claim 3, wherein, an exhaust cavity structure arranged in the nail body and isolated from the liquid supplementing cavity, one end close to the inside of the battery cell is provided with the exhaust hole, and one end far away from the inside of the battery cell is provided with a second through hole; the inside of the exhaust cavity is provided with the second sealing part, and the second sealing part and the exhaust cavity structure are connected with the second spring.

5. The seal spike of claim 3, wherein, The first spring is connected with one end of the liquid supplementing cavity structure close to or far away from the inside of the battery cell, and the second spring is connected with one end of the exhaust cavity structure close to or far away from the inside of the battery cell.

6. The seal of claim 3 wherein, One end of the nail body is provided with a nail head plate, the nail head plate is provided with the liquid supplementing hole and the second through hole; the inside of the nail body is provided with a partition plate and a baffle plate, the partition plate is arranged perpendicularly to the nail head plate, the baffle plate is arranged perpendicularly to the partition plate, the baffle plate is provided with the exhaust hole and the first through hole; the baffle plate, the nail head plate, the partition plate and the nail body form the liquid supplementing cavity structure and the exhaust cavity structure.

7. The seal spike of claim 6, wherein, One end of the nail body is provided with a flange, the inside of the nail body is provided with a partition plate, the partition plate divides the inside of the nail body into at least two independent spaces, a spaced first end plate and a second end plate are embedded in each of the independent spaces, the first end plate is provided with the liquid supplementing hole or the second through hole, and the second end plate is provided with the exhaust hole or the first through hole; the partition plate, the first end plate, the second end plate and the nail body form the liquid supplementing cavity structure or the exhaust cavity structure.

8. The seal spike of claim 7, wherein, The length of the partition plate is equal to the length of the nail body, and the interval between the first end plate and the second end plate is less than or equal to the length of the nail body. The first end plate is arranged in a flush manner with the flange.

9. A cover plate assembly characterized by, The sealing pin is installed in the liquid injection hole of the cover plate body.

10. An electric cell characterized by The electrode assembly is arranged in the shell.

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