Formation nail, battery top cover and battery

Abstract

The utility model provides a formation nail, a battery top cover and a battery, the formation nail comprises a nail column, an exhaust channel is arranged in the nail column in a penetrating manner, a one-way exhaust assembly is arranged in the exhaust channel, the one-way exhaust assembly is connected with the inner wall of the exhaust channel, the exhaust channel comprises an air inlet end and an air outlet end, and the air inlet end is connected with the air outlet end. The one-way exhaust assembly is configured to only allow gas entering the exhaust channel from the gas inlet end to flow through the one-way exhaust assembly and then be exhausted from the gas outlet end, and in other words, the one-way exhaust assembly can achieve one-way exhaust of the gas. In practical application, gas generated in the aging stage of a battery cell can enter the exhaust channel from the gas inlet end and then is exhausted from the gas outlet end in time after passing through the one-way exhaust assembly, the interface infiltration effect in the aging process is improved, the film forming quality is improved, meanwhile, the one-way exhaust assembly only allows one-way exhaust, external steam can be blocked, and the film forming quality is improved. And it is ensured that external steam cannot enter the battery cell after passing through the one-way exhaust assembly.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a formation nail, a battery top cover and a battery. Background Art

[0002] The production process of lithium batteries is very complicated and includes several steps. Aging is an important part of the lithium-ion battery manufacturing process. The purpose of aging is to homogenize the electrolyte solid interface film (SEI film) formed by the internal reaction of the battery cell, accelerate some side reactions such as gas production and electrolyte decomposition, and ensure that the electrolyte can fully infiltrate the electrode, which is conducive to the stable performance of the battery.

[0003] During the aging process, it is usually necessary to plug the injection hole with a formation nail to isolate the inside of the battery cell from the outside environment. At the same time, the formation nail is detachable to ensure the smooth progress of the subsequent refilling steps. In the existing aging stage, when the battery injection hole is sealed, the injection hole is completely blocked with a formation nail. In this way, during the battery aging process, the gas generated cannot be discharged in time, affecting the performance of the battery cell. Utility Model Content

[0004] In view of this, the purpose of the present application is to propose a formation nail, a battery top cover and a battery to solve or partially solve the problems raised by the background technology.

[0005] Based on the above-mentioned purpose, the first aspect of the present application provides a chemical formation nail, including a nail column, an exhaust channel is arranged through the nail column, a one-way exhaust component is provided in the exhaust channel, the one-way exhaust component is connected to the inner wall of the exhaust channel, the exhaust channel includes an air inlet end and an air outlet end, and the one-way exhaust component is configured to only allow the gas entering the exhaust channel from the air inlet end to flow through the one-way exhaust component and then be discharged from the air outlet end.

[0006] Optionally, the one-way exhaust component includes at least a first one-way membrane and a second one-way membrane, the first one-way membrane is fixed to the inner wall of the exhaust channel, the second one-way membrane is located between the first one-way membrane and the exhaust end, and the second one-way membrane can move relative to the first one-way membrane so that the second one-way membrane is laid on the first one-way membrane to prohibit gas circulation, or there is an exhaust gap between the second one-way membrane and the first one-way membrane to allow gas circulation.

[0007] Optionally, at least one first exhaust hole is provided on the first unidirectional membrane, the orthographic projection of the second unidirectional membrane on the first unidirectional membrane completely covers the at least one first exhaust hole, at least one second exhaust hole is provided on the second unidirectional membrane, and the at least one first exhaust hole and the at least one second exhaust hole are staggered.

[0008] Optionally, at least one first exhaust hole is provided on the first one-way membrane, and the second one-way membrane includes at least a first exhaust membrane and a second exhaust membrane. The first exhaust membrane is arranged close to the first one-way membrane, and the second exhaust membrane can be moved relative to the first exhaust membrane so that the second exhaust membrane is laid on the first exhaust membrane or there is a gap between the second exhaust membrane and the first exhaust membrane, and the sum of the orthographic projection of the first exhaust membrane on the first one-way membrane and the orthographic projection of the second exhaust membrane on the first one-way membrane completely covers the at least one first exhaust hole.

[0009] Optionally, at least one third exhaust through hole is provided on the first exhaust membrane, and the at least one third exhaust through hole includes an overlapping through hole, the orthographic projection of the overlapping through hole on the first unidirectional membrane coincides with part of the first exhaust through hole, and the orthographic projection of the second exhaust membrane on the first exhaust membrane completely covers the overlapping through hole.

[0010] Optionally, an exhaust rubber cap is further included, wherein the exhaust rubber cap is connected to the nail column and completely covers the air outlet end, and a plurality of fifth exhaust through holes are provided on the exhaust rubber cap, and the fifth exhaust through holes are connected to the exhaust channel.

[0011] Based on the same inventive concept, the second aspect of the present application provides a battery top cover, comprising at least one liquid injection hole, in which the formation nail described in any one of the first aspects is arranged, and the formation nail is sealed and connected to the liquid injection hole.

[0012] Optionally, two injection holes are provided, the battery top cover further includes an explosion-proof valve, and the two injection holes are respectively located on both sides of the explosion-proof valve.

[0013] Based on the same inventive concept, the third aspect of the present application provides a battery, comprising a box body and at least one battery cell arranged in the box body, the battery cell comprising a battery shell, an electrode assembly arranged in the battery shell, and a battery top cover of any one of the above-mentioned second aspects connected to the battery shell and sealing the battery shell.

[0014] Optionally, the ratio of the length to the width of the battery cell is greater than 3:1, and two injection holes are provided.

[0015] From the above description, it can be seen that the formation nail, battery top cover and battery provided by the present application have an exhaust channel provided through the nail column, and a one-way exhaust component is provided in the exhaust channel. The one-way exhaust component only allows the gas entering the exhaust channel from the air inlet end to flow through the one-way exhaust component and then be discharged from the air outlet end, that is, the one-way exhaust component can realize the one-way discharge of gas. In actual application, the gas generated by the battery cell during the aging stage can enter the exhaust channel from the air inlet end, and then be discharged from the air outlet end in time after passing through the one-way exhaust component, thereby improving the interface wetting effect during the aging process and improving the film forming quality. At the same time, the one-way exhaust component only allows one-way exhaust, which can block external moisture and ensure that external moisture will not enter the battery cell after passing through the one-way exhaust component. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 This is a schematic diagram of the first structure of the chemically formed nail according to an embodiment of the present application;

[0018] Figure 2 This is a schematic diagram of the first structure of a one-way exhaust assembly according to an embodiment of the present application;

[0019] Figure 3 It is a structural schematic diagram of a one-way exhaust assembly when the gas flows from the gas inlet end to the gas outlet end;

[0020] Figure 4 It is a structural schematic diagram of a one-way exhaust assembly when the gas flows from the gas outlet to the gas inlet;

[0021] Figure 5 A second structural schematic diagram of a one-way exhaust assembly according to an embodiment of the present application;

[0022] Figure 6 This is a schematic diagram of a second structure of a chemically formed nail according to an embodiment of the present application;

[0023] Figure 7 This is a schematic diagram of the structure of the exhaust rubber cap according to an embodiment of the present application;

[0024] Figure 8 This is a schematic diagram of the structure of a battery top cover according to an embodiment of the present application;

[0025] Fig. 9 Schematic diagram of the structure of the battery cell of the embodiment of the present application.

[0026] In the figure: 1. nail column; 11. exhaust channel; 111. air inlet channel; 112. circulation channel; 113. air outlet channel; 114. air inlet end; 115. air outlet end; 12. air inlet part; 13. circulation part; 14. exhaust part; 2. one-way exhaust component; 21. first one-way membrane; 211. first exhaust through hole; 22. second one-way membrane; 221. second exhaust through hole; 222. first exhaust membrane; 2221. third exhaust through hole; 2222. overlapping through hole; 223. second exhaust membrane; 2231. fourth exhaust through hole; 3. exhaust rubber cap; 31. fifth exhaust through hole; 4. battery top cover; 41. injection hole; 42. explosion-proof valve; 43. electrode terminal; 5. battery shell. DETAILED DESCRIPTION

[0027] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0028] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be the usual meanings understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connecting" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to represent relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0029] With the continuous iteration of battery energy density and charging speed, new electrolytes with high dynamics and high initial efficiency have gradually emerged in the industry, and new injection technologies have also emerged, which has made the gas production in the aging stage more and more obvious and the gas production volume has also increased. The traditional aging process of using chemical nails to completely seal the injection hole will cause the gas generated inside the battery cell to be unable to be discharged in time, resulting in bulging of the battery shell and affecting the interface self-repair process in the aging stage, which is not conducive to the performance of the battery cell, especially the high-temperature durability performance.

[0030] Based on this, the present application provides a formation nail, a battery top cover and a battery, which can discharge the gas generated by the aging process in time, will not affect the interface self-repair process during the aging stage, and is beneficial to the performance of the battery cell.

[0031] Figure 1The first exemplary structural diagram of the chemically formed nail provided by the present application is shown. Figure 1 The present application provides a chemical forming nail, including a nail column 1, an exhaust channel 11 is provided through the nail column 1, a one-way exhaust component 2 is provided in the exhaust channel 11, the one-way exhaust component 2 is connected to the inner wall of the exhaust channel 11, the exhaust channel 11 includes an air inlet end 114 and an air outlet end 115, and the one-way exhaust component 2 is configured to only allow the gas entering the exhaust channel 11 from the air inlet end 114 to flow through the one-way exhaust component 2 and then be discharged from the air outlet end 115.

[0032] Specifically, the structure of the nail column 1 only needs to be adapted to the structure of the injection hole 41 to be installed, ensuring that the injection hole 41 can be sealed after the nail column 1 is inserted into the injection hole 41 to prevent leakage of the electrolyte.

[0033] The one-way exhaust component 2 is connected to the inner wall of the exhaust channel 11, which means that the one-way exhaust component 2 is connected to all the inner walls of the exhaust channel 11, that is, if the gas entering the exhaust channel 11 wants to flow from the air inlet end 114 to the air outlet end 115 or from the air outlet end 115 to the air inlet end 114, it must flow through the one-way exhaust component 2 and cannot flow through other positions.

[0034] The one-way exhaust component 2 can realize one-way exhaust of gas, and only allows gas to flow in a specific direction. In the present application, the one-way exhaust component 2 only allows the gas entering the exhaust channel 11 from the air inlet end 114 to flow through the one-way exhaust component 2 and then be discharged from the air outlet end 115. In this way, in actual application, the gas generated by the battery cell during the aging stage can enter the exhaust channel 11 from the air inlet end 114, and then pass through the one-way exhaust component 2 and be discharged from the air outlet end 115 in time, thereby improving the interface wetting effect during the aging process and improving the film formation quality.

[0035] At the same time, since the one-way exhaust component 2 only allows one-way exhaust, the gas entering the exhaust channel 11 from the outlet end 115 cannot pass through the one-way exhaust component 2. Therefore, the setting of the one-way exhaust component 2 can block external moisture, ensuring that external moisture will not enter the battery cell after passing through the one-way exhaust component 2, thereby ensuring that the battery cell performance will not be affected by the outside world.

[0036] In some embodiments, Figure 2 FIG. 2 shows a first exemplary structural diagram of a one-way exhaust assembly 2. Figure 2 As shown, the one-way exhaust component 2 includes at least a first one-way membrane 21 and a second one-way membrane 22. The first one-way membrane 21 is fixed to the inner wall of the exhaust channel 11, and the second one-way membrane 22 is located between the first one-way membrane 21 and the air outlet end 115. The second one-way membrane 22 can move relative to the first one-way membrane 21 so that the second one-way membrane 22 is laid on the first one-way membrane 21 to prohibit gas circulation, or an exhaust gap is provided between the second one-way membrane 22 and the first one-way membrane 21 to allow gas circulation.

[0037] Specifically, the first one-way film 21 is fixed to the inner wall of the exhaust passage 11 . Exemplarily, the first one-way film 21 may be bonded to the inner wall of the exhaust passage 11 .

[0038] The second unidirectional membrane 22 is located between the first unidirectional membrane 21 and the air outlet end 115. The second unidirectional membrane 22 may have a gap with the inner wall of the exhaust channel 11, or may be in contact with the inside of the exhaust channel 11 but not fixed, so as to ensure that the second unidirectional membrane 22 can move relative to the first unidirectional membrane 21, so that the second unidirectional membrane 22 can be laid on the first unidirectional membrane 21 or there is a gap between the second unidirectional membrane 22 and the first unidirectional membrane 21.

[0039] The second unidirectional film 22 may be a single-layer film structure or a multi-layer film structure.

[0040] When the second unidirectional film 22 is a single-layer structure, see Figure 2 As shown, at least one first exhaust hole 211 is provided on the first one-way film 21, and the orthographic projection of the second one-way film 22 on the first one-way film 21 completely covers the at least one first exhaust hole 211. In this way, when the second one-way film 22 is laid on the first one-way film 21, the second one-way film 22 can block all the first exhaust holes 211 on the first one-way film 21, so that the gas cannot flow through the first exhaust holes 211, thereby prohibiting the circulation of the gas.

[0041] At least one second exhaust hole 221 is provided on the second unidirectional membrane 22, and at least one first exhaust hole 211 and at least one second exhaust hole 221 are alternately arranged. The alternately arranged first exhaust holes 211 and second exhaust holes 221 can ensure that when the second unidirectional membrane 22 is laid on the first unidirectional membrane 21, the second unidirectional membrane 22 can block all the first exhaust holes 211 on the first unidirectional membrane 21, and can also ensure that when there is a gap between the second unidirectional membrane 22 and the first unidirectional membrane 21, the first exhaust hole 211 and the second exhaust hole 221 can be connected, so that the gas entering the exhaust channel 11 from the air inlet end 114 flows through the first exhaust hole 211 and the second exhaust hole 221 in sequence and then is discharged from the air outlet end 115.

[0042] Figure 3 FIG. 1 shows a schematic diagram of the structure of the one-way exhaust assembly 2 when the gas flows from the gas inlet end 114 to the gas outlet end 115. Figure 3As shown, when the gas generated in the battery cell flows from the air inlet end 114 to the air outlet end 115, since the battery cell has a certain pressure inside, when the gas with a certain pressure flows from the air inlet end 114 to the air outlet end 115, the second unidirectional membrane 22 that is not fixed to the inner wall of the exhaust channel 11 will move in a direction away from the first unidirectional membrane 21 under the push of the air flow and pressure, thereby causing a gap between the second unidirectional membrane 22 and the first unidirectional membrane 21. At this time, the first exhaust through hole 211 and the second exhaust through hole 221 can be connected, thereby allowing the gas that enters the exhaust channel 11 from the air inlet end 114 to flow through the first exhaust through hole 211 and the second exhaust through hole 221 in sequence and then be discharged from the air outlet end 115, so that the gas generated in the battery cell can be discharged in time.

[0043] Figure 4 FIG. 2 shows a schematic diagram of the structure of the one-way exhaust assembly 2 when the gas flows from the gas outlet 115 to the gas inlet 114. Figure 4 As shown, when no gas is generated in the battery cell, the gas no longer flows from the air inlet end 114 to the air outlet end 115. At this time, the second unidirectional membrane 22 can move toward the first unidirectional membrane 21 under the action of its own gravity and / or the external gas flowing from the air outlet end 115 to the air inlet end 114, until the second unidirectional membrane 22 is laid on the first unidirectional membrane 21. At this time, the second unidirectional membrane 22 can completely block the first exhaust holes 211 on the first unidirectional membrane 21, so that the gas cannot pass through the first exhaust holes 211, thereby prohibiting the circulation of gas, preventing external gas from entering the inner core, and ensuring that the battery cell performance will not be affected by the external environment.

[0044] In the present application, the one-way exhaust component 2 can be a double-layer membrane structure, which can ensure the effectiveness of the one-way exhaust component 2 and only allow the gas to flow in one direction, and can also simplify the manufacturing process and save manufacturing costs.

[0045] In some cases, during actual manufacturing, when the first exhaust through hole 211 is made on the first unidirectional film 21 and the second exhaust through hole 221 is made on the second unidirectional film 22, the first exhaust through hole 211 and the second exhaust through hole 221 may not be strictly and completely staggered due to process limitations or process errors, and some of the first exhaust through holes 211 and some of the second exhaust through holes 221 may overlap. In this case, even if the second unidirectional film 22 is laid on the first unidirectional film 21, the second unidirectional film 22 cannot completely block the first exhaust through hole 211, which results in external gas entering the battery cell through the first exhaust through hole 211, thereby affecting the performance of the battery cell.

[0046] Based on this, in some embodiments, the second unidirectional film 22 in the present application can be a multi-layer film structure to ensure that when the second unidirectional film 22 is laid on the first unidirectional film 21, the second unidirectional film 22 can completely block the first exhaust hole 211 on the first unidirectional film 21 to prevent external gas from entering the battery cell. Exemplarily, the second unidirectional film 22 can be a double-layer film structure, a three-layer film structure, or a four-layer film structure, etc., which is not limited here.

[0047] The present application is described in detail below by taking the second unidirectional film 22 as a double-layer film structure as an example.

[0048] In some embodiments, Figure 5 A second exemplary structural schematic diagram of a one-way exhaust assembly 2 is shown. Figure 5 As shown, the second one-way membrane 22 includes at least a first exhaust membrane 222 and a second exhaust membrane 223. The first exhaust membrane 222 is arranged close to the first one-way membrane 21. The sum of the orthographic projection of the first exhaust membrane 222 on the first one-way membrane 21 and the orthographic projection of the second exhaust membrane 223 on the first one-way membrane 21 completely covers at least one first exhaust through hole 211. The second exhaust membrane 223 can move relative to the first exhaust membrane 222 so that the second exhaust membrane 223 is laid on the first exhaust membrane 222 or there is a gap between the second exhaust membrane 223 and the first exhaust membrane 222.

[0049] Specifically, the first exhaust film 222 and the second exhaust film 223 are not fixed to the inner wall of the exhaust channel 11 to ensure that the first exhaust film 222 and the second exhaust film 223 can move relative to the first one-way film 21 .

[0050] The second exhaust membrane 223 can move relative to the first exhaust membrane 222 so that the second exhaust membrane 223 is laid on the first exhaust membrane 222. In this way, when the first exhaust membrane 222 and the second exhaust membrane 223 are laid together on the first one-way membrane 21, the combination of the first exhaust membrane 222 and the second exhaust membrane 223 can completely block the first exhaust holes 211 on the first one-way membrane 21, so that the gas cannot pass through the first exhaust holes 211, thereby prohibiting the circulation of gas, preventing external gas from entering the inner core, and ensuring that the performance of the battery cell will not be affected by the external environment.

[0051] Alternatively, the second exhaust film 223 can move relative to the first exhaust film 222 to allow a gap between the second exhaust film 223 and the first exhaust film 222. In this way, when there is a gap between the second exhaust film 223 and the first exhaust film 222, and there is a gap between the first exhaust film 222 and the first one-way film 21, gas circulation can be allowed.

[0052] Furthermore, at least one third exhaust through hole 2221 is provided on the first exhaust membrane 222, and the at least one third exhaust through hole 2221 includes an overlapping through hole 2222, and the orthographic projection of the overlapping through hole 2222 on the first one-way membrane 21 coincides with part of the first exhaust through hole 211, and the orthographic projection of the second exhaust membrane 223 on the first exhaust membrane 222 completely covers the overlapping through hole 2222.

[0053] Specifically, at least one third exhaust through hole 2221 includes an overlapping through hole 2222, and the overlapping through hole 2222 may be one or more. The orthographic projection of the overlapping through hole 2222 on the first one-way film 21 overlaps with part of the first exhaust through hole 211, and the orthographic projection of the second exhaust film 223 on the first exhaust film 222 completely covers the overlapping through hole 2222, so that when the second exhaust film 223 is laid on the first exhaust film 222, the second exhaust film 223 can completely block the overlapping through hole 2222. When the first exhaust membrane 222 and the second exhaust membrane 223 are both mounted on the first unidirectional membrane 21, the first exhaust hole 211 on the first unidirectional membrane 21 that is not blocked by the first exhaust membrane 222 (i.e., the location of the overlapping hole 2222) can be blocked by the second exhaust membrane 223. In this way, the combination of the first exhaust membrane 222 and the second exhaust membrane 223 can completely block the first exhaust holes 211 on the first unidirectional membrane 21, so that the gas cannot pass through the first exhaust holes 211, thereby prohibiting the circulation of gas, preventing external gas from entering the inner core, and ensuring that the performance of the battery cell will not be affected by the external environment.

[0054] At least one fourth exhaust through hole 2231 is provided on the second exhaust membrane 223. In this way, when there is a gap between the second exhaust membrane 223 and the first exhaust membrane 222, and there is a gap between the first exhaust membrane 222 and the first one-way membrane 21, the first exhaust through hole 211, the third exhaust through hole 2221 and the fourth exhaust through hole 2231 can be connected to allow gas circulation.

[0055] In a specific implementation, when the gas generated in the battery cell flows from the air inlet end 114 to the air outlet end 115, since the battery cell has a certain pressure inside, when the gas with a certain pressure flows from the air inlet end 114 to the air outlet end 115, the first exhaust film 222 and the second exhaust film 223 that are not fixed to the inner wall of the exhaust channel 11 will move in a direction away from the first one-way film 21 under the push of the airflow and pressure, thereby making a gap between the first exhaust film 222 and the first one-way film 21, and a gap between the second exhaust film 223 and the first exhaust film 222. At this time, the first exhaust through hole 211, the third exhaust through hole 2221 and the fourth exhaust through hole 2231 can be connected, thereby making the gas entering the exhaust channel 11 from the air inlet end 114 flow through the first exhaust through hole 211, the second exhaust through hole 221 and the third exhaust through hole 2221 in sequence and then be discharged from the air outlet end, so that the gas generated in the battery cell can be discharged in time.

[0056] When gas is no longer generated in the battery cell, the gas no longer flows from the air inlet end 114 to the air outlet end 115. At this time, the second exhaust film 223 and the first exhaust film 222 can move toward the first one-way film 21 under the action of their own gravity and / or the external gas flowing from the air outlet end 115 to the air inlet end 114, until the second exhaust film 223 is laid on the first exhaust film 222, and the first exhaust film 222 is laid on the first one-way film 21. At this time, the first exhaust film 222 and the second exhaust film 223 can completely block the first exhaust through hole 211 on the first one-way film 21, so that the gas cannot pass through the first exhaust through hole 211, thereby prohibiting the circulation of gas, preventing external gas from entering the inner core, and ensuring that the battery cell performance will not be affected by the external environment.

[0057] In the present application, the one-way exhaust component 2 can be a multi-layer membrane structure, which can ensure the effectiveness of the one-way exhaust component 2 and only allow gas to flow in one direction, thereby avoiding the situation where the second one-way membrane 22 cannot completely cover the first exhaust hole 211 of the first one-way membrane 21 due to process reasons.

[0058] In some embodiments, Figure 6 A second exemplary structural diagram of the chemically formed nail provided in the present application is shown, Figure 7 An exemplary structural schematic diagram of the exhaust rubber cap 3 provided in the present application is shown.

[0059] See also Figure 6 and Figure 7 The chemically formed nail also includes an exhaust rubber cap 3, which is connected to the nail column 1 and completely covers the air outlet end 115. The exhaust rubber cap 3 is provided with a plurality of fifth exhaust through holes 31, and the fifth exhaust through holes 31 are connected to the air outlet channel 113.

[0060] Specifically, the provision of the exhaust rubber cap 3 can, on the one hand, further block external moisture from entering the exhaust channel 11 from the exhaust end 115 , and on the other hand, will not block the discharge of gas entering the exhaust channel 11 from the exhaust end 114 .

[0061] Furthermore, the fifth exhaust through hole 31 is covered with a water-blocking and breathable film, which only allows gas to pass through but not liquid, and the water-blocking and breathable film can further prevent external water vapor from entering the exhaust channel 11. Exemplarily, the water-blocking and breathable film is a polytetrafluoroethylene breathable film.

[0062] In some embodiments, the nail column 1 includes an air inlet portion 12, a circulation portion 13 and an exhaust portion 14 which are integrally formed, and the outer diameter of the circulation portion 13 is larger than the outer diameters of the air inlet portion 12 and the exhaust portion 14. The exhaust channel 11 includes an air inlet channel 111, a circulation channel 112 and an air outlet channel 113, and the circulation channel 112 is located in the circulation portion 13, and the inner diameter of the circulation channel 112 is larger than the inner diameters of the air inlet channel 111 and the exhaust channel 11.

[0063] Specifically, the outer diameter of the circulation portion 13 is larger than the air inlet portion 12 and the air outlet portion 14 , so that the formation nail can be easily inserted into the injection hole 41 in actual use, and the circulation channel 112 with a larger inner diameter is conveniently provided in the circulation portion 13 .

[0064] The inner diameter of the circulation channel 112 is larger than the inner diameters of the intake channel 111 and the exhaust channel 11. On the one hand, it is convenient to set the one-way exhaust component 2 in the circulation channel 112, and on the other hand, it is convenient for gas circulation and exhaust.

[0065] The present application also provides a battery top cover 4, Figure 8 FIG. 4 shows an exemplary structural diagram of a battery top cover 4 provided in the present application. Figure 8 As shown, the battery top cover 4 includes at least one liquid injection hole 41 , in which a forming nail according to any of the above embodiments is arranged, and the forming nail is sealed and connected to the liquid injection hole 41 .

[0066] Specifically, by setting the formation nail of the present application in the injection hole 41, the injection hole 41 can be sealed to prevent leakage of electrolyte, and at the same time, the setting of the one-way exhaust component 2 allows the gas to flow in one direction. In actual use, the gas generated by the battery cell can be discharged in time through the one-way exhaust component 2, which will not affect the interface self-repair process in the aging stage, and is conducive to the performance of the battery cell.

[0067] In some embodiments, two injection holes 41 are provided, the battery top cover 4 further includes an explosion-proof valve 42 , and the two injection holes 41 are respectively located on both sides of the explosion-proof valve 42 .

[0068] Specifically, the two injection holes 41 are respectively located on both sides of the explosion-proof valve 42, so that the gas generated in the battery cell can be discharged in time from the two injection holes 41 on both sides of the explosion-proof valve 42, thereby achieving rapid and uniform discharge of internal gas and improving the aging effect of the battery cell.

[0069] Furthermore, the two injection holes 41 are symmetrically arranged along the central axis direction of the battery top cover 4 to further achieve uniform discharge of the internal gas.

[0070] In some embodiments, the battery top cover 4 further includes two electrode terminals 43, one of which is a positive terminal for connecting to the positive electrode tab, and the other is a negative terminal for connecting to the negative electrode tab. The electrode terminal 43 is connected to the positive electrode tab and the negative electrode tab to output or input electrical energy of the battery cell.

[0071] The explosion-proof valve 42 is located between the two electrode terminals 43. Among the two injection holes 41, one injection hole 41 is located between the positive terminal and the explosion-proof valve 42 and is arranged close to the positive terminal, and the other injection hole 41 is located between the negative terminal and the explosion-proof valve 42 and is arranged close to the negative terminal.

[0072] Since the gas produced inside the battery cell is first discharged from the positive electrode tab and the negative electrode tab, the injection hole 41 is set close to the positive terminal and the negative terminal, which can quickly and timely discharge the gas discharged from the positive electrode tab and the negative electrode tab, improve the exhaust efficiency, and further optimize the aging effect.

[0073] The present application also provides a battery, Fig. 9 Schematic diagram of an exemplary structure of a battery cell provided in the present application is shown. Fig. 9 As shown, the battery provided in the present application includes a box body and at least one battery cell arranged in the box body, and the battery cell includes a battery shell 5, an electrode assembly arranged in the battery shell 5, and a battery top cover 4 described in any of the above embodiments that is connected to the battery shell 5 and closes the battery shell 5.

[0074] Specifically, the battery cell can be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell can be cylindrical, flat, rectangular, or in other shapes.

[0075] A cell is the smallest unit that makes up a battery. Fig. 9 As shown, the battery cell includes a battery top cover 4, a battery shell 5, an electrode assembly (not shown), an electrolyte (not shown) and other functional components (not shown).

[0076] The electrode assembly is a component in the battery cell where electrochemical reactions occur. The electrode assembly is mainly formed by winding or stacking the positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active substances constitute the main body of the electrode assembly, and the parts of the positive and negative electrode sheets without active substances each constitute a tab. The positive tab and the negative tab can be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive active substance and the negative active substance react with the electrolyte, and the tabs connect the electrode terminals 43 to form a current loop.

[0077] The battery housing 5 is a component used to cooperate with the battery top cover 4 to form an internal environment of the battery cell, wherein the formed internal environment can be used to accommodate the electrode assembly and the electrolyte.

[0078] The battery shell 5 and the battery top cover 4 can be independent components. An opening can be set on the battery shell 5, and the battery top cover 4 is made to cover the opening at the opening to form the internal environment of the battery cell. Without limitation, the battery top cover 4 and the battery shell 5 can also be integrated. Specifically, the battery top cover 4 and the battery shell 5 can form a common connection surface before other components are put into the shell. When the interior of the battery shell 5 needs to be encapsulated, the battery top cover 4 is bent relative to the battery shell 5 and covers the battery shell 5. The battery shell 5 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the battery shell 5 can be determined according to the specific shape and size of the electrode assembly. The battery shell 51 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the present application

[0079] The embodiment does not impose any particular limitation on this.

[0080] In a battery, there can be multiple cells, which can be connected in series, in parallel, or in a mixed connection. A mixed connection means that multiple cells are connected in series and in parallel. Multiple cells can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple cells is accommodated in a box; of course, the battery can also be a battery module formed by connecting multiple cells in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in a box. The battery can also include other structures. For example, the battery can also include a busbar component for realizing electrical connection between multiple cells.

[0081] In the present application, a forming nail is arranged in the injection hole 41 of the battery top cover 4. The one-way exhaust component 2 is arranged in the forming nail, so that the gas generated by the battery cell during the aging stage can enter the exhaust channel 11 from the air inlet end 114, and then pass through the one-way exhaust component 2 and be discharged from the air outlet end 115 in time, thereby improving the interface wetting effect during the aging process and improving the film forming quality. At the same time, the one-way exhaust component 2 only allows one-way exhaust, which can block external moisture and ensure that external moisture will not enter the interior of the battery cell after passing through the one-way exhaust component 2.

[0082] In some embodiments, the ratio of the length to the width of the battery cell is greater than 3:1, and two injection holes 41 are provided.

[0083] Specifically, the length direction of the battery cell is Fig. 9 The width direction of the battery cell is Fig. 9 W direction shown.

[0084] When the ratio of the length to the width of the battery cell is greater than 3:1, the length of the battery cell is long, so that the internal gas is not easy to be discharged. At this time, by providing two injection holes 41, the internal gas can be discharged from the two injection holes 41 located at different positions, thereby improving the exhaust efficiency, thereby optimizing the aging efficiency and improving the battery cell performance.

[0085] Exemplarily, the ratio of the length to the width of the battery cell may be 3.1:1, 3.5:1, 4:1, 4.5:1, 5:1, etc.

[0086] In addition, the exhaust efficiency of the battery cell is not only related to the size of the battery cell, but also to the electrolyte, injection technology, etc. Therefore, even if the ratio of the length and width of the battery cell is less than or equal to 3:1, when the gas production inside the battery cell is large due to factors such as the electrolyte or injection technology, opening two injection holes 41 on the battery top cover 4 is also beneficial to improving the exhaust efficiency and optimizing the aging performance.

[0087] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application (including the claims) is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present application as described above, which are not provided in detail for the sake of simplicity.

[0088] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A chemically formed nail, characterized in that: It includes a nail column, an exhaust channel is set through the nail column, a one-way exhaust component is set in the exhaust channel, the one-way exhaust component is connected to the inner wall of the exhaust channel, the exhaust channel includes an air inlet end and an air outlet end, and the one-way exhaust component is configured to only allow the gas entering the exhaust channel from the air inlet end to flow through the one-way exhaust component and then be discharged from the air outlet end.

2. The chemically formed nail according to claim 1, characterized in that: The one-way exhaust component includes at least a first one-way membrane and a second one-way membrane, wherein the first one-way membrane is fixed to the inner wall of the exhaust channel, and the second one-way membrane is located between the first one-way membrane and the exhaust end, and the second one-way membrane can move relative to the first one-way membrane so that the second one-way membrane is laid on the first one-way membrane to prohibit gas circulation, or an exhaust gap is provided between the second one-way membrane and the first one-way membrane to allow gas circulation.

3. The chemically formed nail according to claim 2, characterized in that: At least one first exhaust hole is provided on the first unidirectional membrane, the orthographic projection of the second unidirectional membrane on the first unidirectional membrane completely covers the at least one first exhaust hole, at least one second exhaust hole is provided on the second unidirectional membrane, and the at least one first exhaust hole and the at least one second exhaust hole are staggered.

4. The chemically formed nail according to claim 2, characterized in that: At least one first exhaust hole is provided on the first one-way membrane, and the second one-way membrane includes at least a first exhaust membrane and a second exhaust membrane. The first exhaust membrane is arranged close to the first one-way membrane, and the sum of the orthographic projection of the first exhaust membrane on the first one-way membrane and the orthographic projection of the second exhaust membrane on the first one-way membrane completely covers the at least one first exhaust hole, and the second exhaust membrane can move relative to the first exhaust membrane so that the second exhaust membrane is laid on the first exhaust membrane or there is a gap between the second exhaust membrane and the first exhaust membrane.

5. The chemically formed nail according to claim 4, characterized in that: At least one second exhaust through hole is provided on the first exhaust membrane, and the at least one second exhaust through hole includes an overlapping through hole, the orthographic projection of the overlapping through hole on the first unidirectional membrane coincides with at least part of the first exhaust through hole, and the orthographic projection of the second exhaust membrane on the first exhaust membrane completely covers the overlapping through hole.

6. The chemically formed nail according to claim 1, characterized in that: It also includes an exhaust rubber cap, which is connected to the nail column and completely covers the air outlet end. The exhaust rubber cap is provided with a plurality of fifth exhaust through holes, and the fifth exhaust through holes are connected to the exhaust channel.

7. A battery top cover, characterized in that: The invention comprises at least one injection hole, in which the chemical forming nail according to any one of claims 1 to 6 is arranged, and the chemical forming nail is sealed and connected to the injection hole.

8. The battery top cover according to claim 7, characterized in that: There are two injection holes, and the battery top cover also includes an explosion-proof valve. The two injection holes are respectively located on both sides of the explosion-proof valve.

9. A battery, characterized in that: The invention comprises a box body and at least one battery cell arranged in the box body, wherein the battery cell comprises a battery shell, an electrode assembly arranged in the battery shell, and a battery top cover according to any one of claims 7 to 8 connected to and sealing the battery shell.

10. The battery according to claim 9, characterized in that There are two injection holes, and the ratio of the length to the width of the battery core is greater than 3:1.

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