Single battery and electric equipment

Abstract

The utility model discloses a single battery and electric equipment, and belongs to the technical field of batteries, the single battery has the size L in the length direction, the size W in the height direction and the size H in the thickness direction, the condition that L > W > H is satisfied, and a pole and an anti-explosion valve are oppositely arranged, so that the utilization rate of the internal space of a shell is increased, and the service life of the shell is prolonged. The exhaust part is arranged on at least one side of the two opposite sides of the electrode assembly in the height direction, the first guide groove is formed in the face, away from the main body part, of the exhaust part, and the first guide groove penetrates through the exhaust part in the length direction; therefore, when the anti-explosion valve is opened, gas generated at one end, close to the pole, of the electrode assembly can be discharged from the anti-explosion valve through the first guide groove, gas generated by the main body part is prevented from being accumulated near the pole, and the use safety of the single battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and particularly relates to a single cell and an electrical device using the same. Background Art

[0002] In existing blade-type single cells, to prevent insulation failure around the pole column and short circuit when the explosion-proof valve exhausts gas, the explosion-proof valve is arranged on the side opposite to the pole column. However, this will cause the gas generated at one end of the electrode assembly adjacent to the pole column in the single cell to not be discharged in time through the explosion-proof valve, affecting the use safety of the single cell. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a single cell and an electrical device using the same, so as to solve the problem that the gas generated by the electrode assembly cannot be discharged in time due to the relative arrangement of the explosion-proof valve and the pole column in the current single cell.

[0004] In a first aspect of an embodiment of the present application, a single cell is provided. The single cell has a length direction, a height direction, and a thickness direction that intersect pairwise. The single cell has a size L mm along the length direction, a size W mm along the height direction, and a size H mm along the thickness direction, satisfying: L > W > H. The single cell includes: a housing, provided with an opening and a receiving cavity communicating with the opening; an electrode assembly, disposed in the receiving cavity; a top cover assembly, the top cover assembly includes a pole column and a top cover plate, the top cover plate covers the opening, the pole column is disposed on the top cover plate and connected to the electrode assembly; an explosion-proof valve, disposed at one end of the housing along the length direction away from the top cover assembly; an exhaust member, along the height direction, the exhaust member is disposed on at least one of the opposite sides of the electrode assembly. A first guide groove extending along the length direction is formed on a surface of the exhaust member facing away from the electrode assembly; along the length direction, the first guide groove penetrates through the exhaust member. When the explosion-proof valve is opened, the gas generated at one end of the electrode assembly adjacent to the pole column can be discharged from the explosion-proof valve through the first guide groove.

[0005] Optionally, the housing includes a body and an end cover; along the length direction, the end cover is disposed at one end of the housing away from the top cover assembly, the explosion-proof valve is disposed on the end cover, and an exhaust groove extending along the height direction is formed on a surface of the end cover facing the top cover assembly; along the height direction, one end of the exhaust groove faces the explosion-proof valve, and the other end penetrates through one end of the end cover adjacent to the exhaust member; the gas in the first guide groove can be discharged to the explosion-proof valve through the exhaust groove.

[0006] Optionally, the end cap includes a base body; along the length direction, a part of the base body bulges towards the direction away from the top cover assembly to form a convex part, so as to form a concave cavity on the side of the base body facing the top cover assembly, the explosion-proof valve is arranged on the convex part, and the exhaust groove is opened on the side of the base body facing the top cover assembly; along the height direction, one end of the exhaust groove away from the exhaust part penetrates through the connection part of the convex part and the base body to communicate with the concave cavity.

[0007] Optionally, a groove is opened on the side of the end cap facing the top cover assembly along the length direction, the groove includes a groove bottom and a groove wall surrounding the groove bottom along the circumferential direction of the groove bottom, and the explosion-proof valve is arranged on the groove bottom; along the height direction, one end of the exhaust groove away from the exhaust part penetrates through the adjacent groove wall to communicate with the groove.

[0008] Optionally, at least one first through hole penetrating through the exhaust part along the height direction is opened on the exhaust part; along the length direction, the first through hole divides the first guide groove into at least two air guide grooves arranged at intervals, and at least two of the air guide grooves are communicated through the first through hole.

[0009] Optionally, a second guide groove is opened on the side of the exhaust part away from the electrode assembly along the height direction, and the second guide groove extends along the thickness direction; along the thickness direction, one end of the second guide groove is communicated with the first through hole, and the other end penetrates through the exhaust part.

[0010] Optionally, a third guide groove is opened on the side of the exhaust part away from the electrode assembly along the height direction, and the third guide groove extends along the thickness direction; the number of the first through holes is at least two, and along the length direction, at least two of the first through holes are arranged at intervals to divide the first guide groove into at least three air guide grooves arranged at intervals; the third guide groove penetrates through the exhaust part along the thickness direction, and the third guide groove intersects and communicates with the air guide groove between two adjacent first through holes in the length direction.

[0011] Optionally, the single cell further includes a first insulating film; the electrode assembly includes a main body portion and a tab, the tab is disposed at one end of the main body portion facing the top cover sheet along the length direction, and the pole column is connected to the tab; the first insulating film is a tetrahedral structure with openings at opposite ends along the length direction, and the first insulating film is sleeved on the main body portion; along the height direction, the first insulating film includes a first side surface and a second side surface which are oppositely arranged, the first side surface includes a first layer and a second layer, and a partial overlapping area is formed by the partial overlapping of the first layer and the second layer; along the height direction, an exhaust member is provided on each of the first side surface and the second side surface, the exhaust member provided on the first side surface is stacked with the first layer and the second layer, and the first through hole exposes a part of the overlapping area.

[0012] Optionally, the housing includes a main body, the main body includes two end walls oppositely arranged along the height direction and two side walls oppositely arranged along the thickness direction, the opposite sides of the end walls along the thickness direction are respectively connected to the adjacent side walls, and an inner corner is provided at the connection of the side walls and the end walls; the electrode assembly includes a main body portion and a tab, the tab is disposed at one end of the main body portion facing the top cover sheet along the length direction; the main body portion includes two end faces oppositely arranged along the height direction and two wall faces oppositely arranged along the thickness direction, the opposite sides of the end faces along the thickness direction are respectively connected to the adjacent wall faces, and a second corner portion is formed on the side facing the housing at the connection of the wall faces and the end faces; there is a first gap between the exhaust member and the adjacent end wall; there is a second gap between the second corner portion and the adjacent first corner portion.

[0013] A second aspect of the embodiments of the present application provides an electrical device, including the single cell as described above.

[0014] In summary, the embodiment of the present application provides a single cell and an electrical device having the single cell, wherein the single cell has a dimension L in the length direction, a dimension W in the height direction, and a dimension H in the thickness direction, satisfying L>W>H, and the electrode assembly is arranged in the accommodating cavity of the shell, the top cover sheet of the top cover assembly is covered on the opening of the shell, the pole is arranged on the top cover sheet and connected to the electrode assembly, and the explosion-proof valve is arranged at one end of the shell away from the top cover assembly along the length direction, thereby improving the utilization rate of the internal space of the shell, the pole and the explosion-proof valve are arranged relative to each other, thereby preventing a large amount of gas from being ejected from the explosion-proof valve during thermal runaway, causing insulation failure around the pole and thus causing a short circuit, and an exhaust member is arranged on at least one of the two opposite sides of the electrode assembly along the height direction, and a first guide groove is opened on a side of the exhaust member away from the electrode assembly, and the first guide groove passes through the exhaust member along the length direction, so that when the explosion-proof valve is opened, the gas generated at one end of the electrode assembly adjacent to the pole can be discharged from the explosion-proof valve through the first guide groove, thereby avoiding the gas generated by the electrode assembly from accumulating near the pole, thereby improving the safety of the single cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 is a schematic structural diagram of a single cell provided in an embodiment of the present application from a first angle;

[0017] Figure 2 is a schematic structural diagram of a single cell provided in an embodiment of the present application from a second angle;

[0018] Figure 3 yes Figure 2 Exploded diagram of

[0019] Figure 4 It is a schematic diagram of the combined structure of the pole and the insulating member in the top cover assembly of the single cell provided in the embodiment of the present application;

[0020] Figure 5 It is a schematic diagram of the exploded structure of the shell and end cover, explosion-proof valve and patch in the single cell provided in the embodiment of the present application;

[0021] Figure 6 It is a schematic diagram of the combined structure of the electrode assembly, the top cover assembly and the exhaust member in the single cell provided in the embodiment of the present application;

[0022] Figure 7It is a schematic structural diagram of the first angle of the exhaust component in the single cell provided by the embodiment of the present application;

[0023] Figure 8 It is a schematic structural diagram of the second angle of the exhaust component in the single cell provided by the embodiment of the present application;

[0024] Figure 9 It is a schematic structural diagram of the first type of end cap in the single cell provided by the embodiment of the present application;

[0025] Figure 10 is Figure 9 side view of;

[0026] Figure 11 It is a schematic structural diagram of the second type of end cap in the single cell provided by the embodiment of the present application;

[0027] Figure 12 is Figure 3 enlarged structural diagram at B of;

[0028] Figure 13 is Figure 6 enlarged structural diagram at C of;

[0029] Figure 14 It is a schematic structural diagram of the first insulating film in the single cell provided by the embodiment of the present application;

[0030] Figure 15 is Figure 2 A - A sectional view of;

[0031] Figure 16 is Figure 15 enlarged structural diagram at D of.

[0032] Main reference numeral description:

[0033] 1. Single cell;

[0034] 10. Housing, 101. Accommodating cavity, 102. Opening, 1021. First opening, 1022. Second opening, 11. Body, 110. First corner, 12. End cap, 120. Exhaust groove, 121. Substrate, 122. Protrusion, 1220. Concave cavity, 123. Groove, 1231. Groove bottom, 1232. Groove wall, 124. Second through - hole, 13. End wall, 131. First end wall, 132. Second end wall, 14. Side wall, 141. First side wall, 142. Second side wall, 15. First wall, 16. Second wall;

[0035] 20. Electrode assembly, 21. Main body, 210. Second corner, 211. End face, 2111. First end face, 2112. Second end face, 212. Wall surface, 2121. First wall surface, 2122. Second wall surface, 213. Second gap, 22. Tab, 221. Positive tab, 222. Negative tab, 23. First insulating film, 230. Overlapping area, 231. First side, 2311. First layer, 2312. Second layer, 232. Second side, 233. Third side, 234. Fourth side;

[0036] 30. Top cover assembly, 31. Terminal post, 311. Positive terminal post, 312. Negative terminal post, 32. Top cover plate, 33. Insulating part, 34. Liquid injection hole;

[0037] 40. Explosion-proof valve, 41. Patch;

[0038] 50. Exhaust part, 501. First gap, 51. First guide groove, 511. Gas guide groove, 52. First through hole, 53. Second guide groove, 54. Third guide groove;

[0039] 60. Second insulating film;

[0040] 70. Connecting piece;

[0041] X. Length direction, Y. Height direction, Z. Thickness direction. Detailed implementation mode

[0042] In order to make the objectives, technical solutions, and beneficial effects of this application clearer, the following further elaborates on this application in combination with the accompanying drawings and specific implementation modes. It should be understood that the specific implementation modes described in this specification are only for explaining this application and not for limiting this application.

[0043] In the description of this application, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings. These are only for facilitating the description of this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to this application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of this application, "a plurality" means two or more, unless otherwise specifically defined.

[0044] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0045] In the present application, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the horizontal height of the first feature is less than that of the second feature.

[0046] In the embodiments of the application, "parallel" means the state where the angle formed by a straight line and a straight line, a straight line and a plane, or a plane and a plane is -1° to 1°. Additionally, "perpendicular" means the state where the angle formed by a straight line and a straight line, a straight line and a plane, or a plane and a plane is 89° to 91°. Equal distance or equal angle means the state where the tolerance range is -1% to 1%.

[0047] This embodiment provides an electrical device, including a single cell 1, and the single cell 1 serves as the power supply of the electrical device. The electrical device can be, but is not limited to, a mobile device (such as a mobile phone, a laptop computer, etc.), an electric vehicle (such as a pure electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, an electric bicycle, an electric scooter, an electric golf cart, an electric truck, etc.), an electric train, a ship, a satellite, an energy storage system, etc.

[0048] In some embodiments of the present application, a single cell 1 is provided. Refer to Figures 1 to 16 , the single cell 1 includes: a housing 10, an electrode assembly 20, a top cover assembly 30, an explosion-proof valve 40, and an exhaust member 50. The single cell 1 has a length direction X, a height direction Y, and a thickness direction Z that intersect pairwise. Specifically, in the embodiment as shown in Figures 1 to 16 , the length direction X, the height direction Y, and the thickness direction Z are pairwise orthogonal. Refer to Figure 2 , the single cell 1 has a dimension L mm along the length direction X, a dimension W mm along the height direction Y, and a dimension H mm along the thickness direction Z, satisfying: L > W > H.

[0049] Refer to Figure 3 , Figure 5 , Figure 12 and Figures 15 to 16 , there is an accommodation cavity 101 inside the housing 10. Refer to Figure 5 , the housing 10 is provided with an opening 102, and the accommodation cavity 101 communicates with the opening 102. Specifically, the opening 102 is opened at one of the opposite ends of the housing 10 along the length direction X. The housing 10 includes a main body 11. Refer to Figure 5 and Figure 15 , the main body 11 includes two end walls 13 oppositely arranged along the height direction Y, two side walls 14 oppositely arranged along the thickness direction Z, and a first wall 15 and a second wall 16 oppositely arranged along the length direction X. The two end walls 13 include a first end wall 131 and a second end wall 132. The two side walls 14 include a first side wall 141 and a second side wall 142. The first end wall 131, the first side wall 141, the second end wall 132 and the second side wall 142 are sequentially connected end to end to form a tetrahedral structure with both ends open. The first wall 15 and the second wall 16 respectively cover the two open ends to form a closed hexahedron. The opening 102 is opened on the first wall 15.

[0050] Refer to Figure 3 , Figure 12 and Figures 15 to 16 , the electrode assembly 20 is arranged in the accommodation cavity 101 of the housing 10. The electrode assembly 20 includes a main body part 21 and a tab 22. The main body part 21 extends along the length direction X. The tab 22 is arranged at one of the opposite ends of the main body part 21 along the length direction X. Specifically, the tab 22 is arranged at one end of the main body part 21 along the length direction X facing the opening 102. The tab 22 is connected to the main body part 21. Refer to Figure 3 , the tab 22 includes a positive tab 221 and a negative tab 222.

[0051] Refer to Figure 1 , Figures 3 to 4 and Figure 6 , the top cover assembly 30 is arranged at one end of the housing 10 along the length direction X adjacent to the tab 22. Specifically, the top cover assembly 30 includes a pole column 31 and a top cover plate 32. The top cover plate 32 covers the opening 102 of the housing 10. The pole column 31 is arranged on the top cover plate 32, and the pole column 31 penetrates through the top cover plate 32 along the length direction X and is connected to the tab 22. Specifically, in the embodiments shown in Figure 1 , Figure 3 and Figure 6 , the pole column 31 includes a positive pole column 311 and a negative pole column 312. The positive pole column 311 is connected to the positive tab 221, and the negative pole column 312 is connected to the negative tab 222.

[0052] Refer to Figures 2 to 3 and Figure 5, the explosion-proof valve 40 is disposed at one end of the housing 10 along the length direction X away from the top cover assembly 30. Specifically, the explosion-proof valve 40 is disposed on the second wall 16 of the main body 11.

[0053] Referring to Figure 3 , Figures 6 to 8 , Figure 13 and Figure 16 , the exhaust member 50 is disposed on at least one of the opposite sides of the electrode assembly 20 along the height direction Y. Specifically, the exhaust member 50 is disposed on at least one of the opposite sides of the main body portion 21 of the electrode assembly 20 along the height direction Y. Specifically, in the embodiment shown in Figure 3 , the number of the exhaust members 50 is two, and one exhaust member 50 is disposed on each of the opposite sides of the main body portion 21 along the height direction Y. Referring to Figure 3 , Figures 6 to 7 and Figure 13 , a first guide groove 51 extending along the length direction X is formed on a surface of the exhaust member 50 facing away from the main body portion along the height direction Y. The first guide groove 51 penetrates the exhaust member 50 along the length direction X to form a through groove structure of the first guide groove 51. When the explosion-proof valve 40 is opened, the gas generated at one end of the main body portion 21 of the electrode assembly 20 adjacent to the pole column 31 along the length direction X can be discharged from the explosion-proof valve 40 through the first guide groove 51.

[0054] In existing blade-type single cells, a double-pass structure design is often adopted, that is, the positive pole column and the negative pole column of the single cell are respectively located on the top cover assemblies on the opposite side walls in the length direction of the single cell. In the structure design of the double top cover, the insulating member in the top cover assembly will occupy too much space inside the housing of the single cell. Moreover, in the structure design of the electrode assembly with the opposite side pole ears in the double top cover, the opposite side pole ears will also occupy more space inside the housing, resulting in a low utilization rate of the internal space of the single cell and affecting the energy density of the single cell. In addition, the explosion-proof valve in the blade-type single cell is either disposed at the bottom of the housing of the single cell or on the top cover assemblies on both side walls in the length direction of the housing. When the explosion-proof valve is disposed on the bottom wall of the housing (that is, the explosion-proof valve and the pole column are respectively disposed on different walls of the housing), it will affect the overall strength of the housing due to the butt welding and assembly between the wall surface where the explosion-proof valve is located and the housing. Moreover, when the single cells are arranged to form a battery pack, it occupies a large space, affecting the space utilization rate of the battery pack. In addition, the distance between the explosion-proof valve and the pole column is relatively far, and the gas generated at one end of the electrode assembly adjacent to the pole column cannot be discharged in time through the explosion-proof valve, resulting in accumulation, affecting the use safety of the single cell. When the explosion-proof valve is disposed on the top cover assembly, the distance between the explosion-proof valve and the pole column is relatively close. When the single cell undergoes thermal runaway, a large amount of gas discharged from the explosion-proof valve increases the risk of short circuit due to the failure of the insulation around the pole column, affecting the use safety of the single cell.

[0055] The single cell 1 provided in the embodiment of the present application has a dimension L along the length direction X, a dimension W along the height direction Y, and a dimension H along the thickness direction Z, satisfying L>W>H, so that the single cell 1 forms a blade-type single cell, and the pole ear 22 in the electrode assembly 20 is arranged at one of the two opposite ends of the main body 21 along the length direction X, forming a same-side pole ear structure of the electrode assembly 20, thereby improving the space utilization rate inside the shell 10, and the top cover assembly 30 is arranged at one end of the shell 10 adjacent to the pole ear 22 in the length direction X, and the pole column 31 in the top cover assembly 30 is connected to the pole ear 22, so that the top cover assembly 30 is only arranged at one end of the shell 10 in the length direction X, forming a single top cover structural design of the single cell 1. Compared with the single cell with double top covers, the single cell 1 with a single top cover reduces the space occupied by 20% to 50% in the length direction X, thereby further improving the space utilization rate inside the shell 10, and the explosion-proof valve 40 is arranged at the shell 10 away from the top cover assembly 30 in the length direction X. The explosion-proof valve 40 and the top cover assembly 30 are arranged opposite to each other along the length direction X, so that a large amount of gas is prevented from being ejected from the explosion-proof valve 40 during thermal runaway, causing insulation failure around the pole 31 and thus causing a short circuit, thereby improving the safety of the single battery 1. In addition, the explosion-proof valve 40 is arranged at one end of the shell 10 along the length direction X, which can improve the overall strength of the shell 10. An exhaust member 50 is arranged on at least one side of the main body 21 of the electrode assembly 20 in the height direction Y, and a first guide groove 51 is provided on a side of the exhaust member 50 away from the main body 21. The first guide groove 51 penetrates the exhaust member 50 along the length direction X, so that when the explosion-proof valve 40 is opened due to thermal runaway of the single battery 1, the gas generated at one end of the main body 21 adjacent to the pole 31 in the length direction X can be conducted to the explosion-proof valve 40 through the first guide groove 51 and discharged from the single battery 1 through the explosion-proof valve 40, thereby preventing the gas generated by the main body 21 from accumulating near the pole 31, thereby improving the safety of the single battery 1 and the service life of the single battery 1.

[0056] Among them, when the single cell 1 undergoes thermal runaway, the gas generated by the main body 21 needs to be discharged to the outside of the single cell 1 through the explosion-proof valve 40. Since the pole column 31 and the explosion-proof valve 40 are oppositely arranged along the length direction X, the exhaust distance of the gas generated at one end of the main body 21 adjacent to the pole column 31 is the longest. Moreover, when the single cell 1 is in a high-temperature and / or slow-charging state, the main body 21 will expand, and the expansion force of the main body 21 in the thickness direction Z is the largest. The main body 21 is in close contact with the two side walls 14 of the housing 10 in the thickness direction Z due to expansion, resulting in difficulty for the gas generated at one end of the main body 21 adjacent to the pole column 31 to be discharged through the gap between the main body 21 and the housing 10 in the thickness direction Z. The setting of the first guide groove 51 on the exhaust member 50 provides an exhaust passage for the main body 21 extending along the length direction X, enabling the gas generated at one end of the main body 21 adjacent to the pole column 31 to smoothly discharge from the explosion-proof valve 40 through the first guide groove 51 and be discharged to the outside of the single cell 1 through the explosion-proof valve 40, improving the use safety of the single cell 1.

[0057] In some embodiments, referring to Figures 2 to 3 , Figure 5 and Figures 9 to 11 , the housing 10 includes a main body 11 and an end cap 12.

[0058] Referring to Figure 5 , the number of openings 102 on the housing 10 is two, including a first opening 1021 and a second opening 1022. The first opening 1021 is formed on the first wall 15 of the main body 11, and the second opening 1022 is formed on the second wall 16 of the main body 11. The top cover piece 32 covers the first opening 1021.

[0059] Referring to Figures 2 to 3 and Figure 5 , the end cap 12 is arranged at one end of the housing 10 along the length direction X away from the top cover assembly 30, and the explosion-proof valve 40 is arranged on the end cap 12. Specifically, in the embodiment shown in Figure 5 , the end cap 12 covers the second opening 1022. Referring to Figures 9 to 11 , an exhaust groove 120 extending along the height direction Y is formed on the surface of the end cap 12 facing the top cover assembly 30 along the length direction X. Along the height direction Y, one end of the exhaust groove 120 faces the explosion-proof valve 40, and the other end penetrates through one end of the end cap 12 adjacent to the exhaust member 50. When the explosion-proof valve 40 is opened, the gas in the first guide groove 51 of the exhaust member 50 can be discharged from the explosion-proof valve 40 through the exhaust groove 120. The setting of the exhaust groove 120 can form a guide for the gas in the first guide groove 51, forming an exhaust passage extending along the length direction X and the height direction Y inside the housing 10, enabling the gas in the first guide groove 51 to be discharged from the explosion-proof valve 40 in a timely and smooth manner and be discharged to the outside of the single cell 1 through the explosion-proof valve 40, improving the use safety of the single cell 1.

[0060] In some embodiments, referring to Figures 2 to 3 、 Figure 5 and Figures 9 to 10 , the end cap 12 includes a base body 121. Along the length direction X, a part of the base body 121 bulges away from the top cover assembly 30 to form a convex part 122, so as to form a concave cavity 1220 on the side of the base body 121 facing the top cover assembly 30. Referring to Figures 2 to 3 and Figure 5 , the explosion-proof valve 40 is arranged on the convex part 122. Referring to Figures 9 to 10 , the exhaust groove 120 is opened on the side of the base body 121 facing the top cover assembly 30 along the length direction X. Along the height direction Y, one end of the exhaust groove 120 away from the exhaust part 50 penetrates through the connection part of the convex part 122 and the base body 121 to communicate with the concave cavity 1220. Specifically, one of the two opposite ends of the exhaust groove 120 along the height direction Y penetrates through the connection part of the convex part 122 and the base body 121, and the other end penetrates through the base body 121, so that the exhaust groove 120 forms a through groove structure, so that the gas in the first guide groove 51 on the exhaust part 50 can be discharged to the concave cavity 1220 through the exhaust groove 120 and discharged to the outside of the single cell 1 through the explosion-proof valve 40 arranged on the convex part 122. The setting of the convex part 122 makes the explosion-proof valve 40 and the main body part 21 of the electrode assembly 20 form a gap in the length direction X, increasing the distance between the explosion-proof valve 40 and the main body part 21 in the length direction X, avoiding affecting the exhaust efficiency of the main body part 21 due to the too small distance between the explosion-proof valve 40 and the main body part 21, and preventing the short circuit situation due to the too small distance between the explosion-proof valve 40 and the main body part 21, ensuring the use safety of the single cell 1.

[0061] Among them, the measurement method of the size of the single cell 1 is as follows:

[0062] Using a size measuring instrument, such as a micrometer, to measure the size L of the single cell 1 in the length direction X, the size W in the height direction Y, and the size H in the thickness direction Z. Specifically, referring to Figure 2 , L is the distance between the side of the end cap 12 facing away from the top cover assembly 30 in the length direction X and the side of the top cover assembly 30 facing away from the end cap 12, W is the distance between the two opposite sides of the single cell 1 along the height direction Y, and H is the distance between the two opposite sides of the single cell 1 along the thickness direction Z.

[0063] In some embodiments, 400mm ≤ L ≤ 550mm. Specifically, the value of L can be any value among 400mm, 420mm, 450mm, 470mm, 500mm, 520mm, 550mm or any value in the range value composed of any two of these values. When the value of L is within the above range, the single cell 1 forms a short knife cell among the blade type cells.

[0064] In some embodiments, 150 mm ≤ W ≤ 250 mm. Specifically, the value of W can be any value among 150 mm, 170 mm, 200 mm, 220 mm, 250 mm, or any value within the range formed by any two of these values.

[0065] In some embodiments, 45 mm ≤ H ≤ 65 mm. Specifically, the value of H can be any value among 45 mm, 50 mm, 55 mm, 60 mm, 65 mm, or any value within the range formed by any two of these values.

[0066] In some embodiments, referring to Figure 4 , the center distance between the positive electrode post 311 and the negative electrode post 312 is S1 mm, satisfying: 0.5L ≤ S1 ≤ 0.9L. Combining with 400 mm ≤ L ≤ 550 mm, it can be obtained that 200 mm ≤ S1 ≤ 495 mm, and S1 < W. Here, the center distance between the positive electrode post 311 and the negative electrode post 312 is the distance along the height direction Y between the center point of the positive projection of the positive electrode post 311 in the length direction X and the center point of the positive projection of the negative electrode post 312 in the length direction X.

[0067] In some embodiments, referring to Figure 5 , the housing 10 has a dimension S2 mm along the length direction X, that is, the distance between the first wall 15 and the second wall 16 along the length direction X, satisfying: 0.95L ≤ S2 ≤ 1.0L. Combining with 400 mm ≤ L ≤ 550 mm, it can be obtained that 380 mm ≤ S2 ≤ 550 mm. Specifically, the value of S2 can be any value among 380 mm, 400 mm, 420 mm, 450 mm, 470 mm, 500 mm, 520 mm, 550 mm, or any value within the range formed by any two of these values.

[0068] In some embodiments, referring to Figure 5 , the housing 10 has a dimension S3 mm along the height direction Y, that is, the distance between the first end wall 131 and the second end wall 132 along the height direction Y, satisfying: 0.95W ≤ S3 ≤ 1.0W. Combining with 150 mm ≤ W ≤ 250 mm, it can be obtained that 142.5 mm ≤ S3 ≤ 250 mm. Specifically, the value of S3 can be any value among 142.5 mm, 150 mm, 170 mm, 200 mm, 220 mm, 250 mm, or any value within the range formed by any two of these values.

[0069] In some embodiments, referring to Figure 5, the housing 10 has a dimension S4 mm in the thickness direction Z, that is, the distance between the first side wall 141 and the second side wall 142 in the thickness direction Z, satisfying: 0.95H ≤ S4 ≤ 1.0H. Combining 45 mm ≤ H ≤ 65 mm, it can be obtained that 42.75 mm ≤ S4 ≤ 65 mm. Specifically, the value of S4 can be any value among 42.75 mm, 45 mm, 50 mm, 55 mm, 60 mm, 65 mm or any value within the range value composed of any two of these values.

[0070] In some embodiments, referring to Figures 1 to 3 , the single cell 1 further includes a second insulating film 60. The second insulating film 60 covers the two end walls 13 and the two side walls 14 of the housing 10 to form an insulating cover for the housing 10. The setting of the second insulating film 60 makes the dimension S3 of the housing 10 in the height direction Y smaller than the dimension W of the single cell 1 in the height direction Y, and makes the dimension S4 of the housing 10 in the thickness direction Z smaller than the dimension H of the single cell 1 in the thickness direction Z.

[0071] In some embodiments, if the second insulating film 60 is not covered on the housing 10, then the dimension S3 of the housing 10 in the height direction Y is equal to the dimension W of the single cell 1 in the height direction Y, and the dimension S4 of the housing 10 in the thickness direction Z is equal to the dimension H of the single cell 1 in the thickness direction Z.

[0072] In some embodiments, referring to Figure 5 and Figures 9 to 10 , a second through hole 124 penetrating the protruding portion 122 in the length direction X is formed in the protruding portion 122, and the explosion-proof valve 40 is embedded in the second through hole 124.

[0073] In some embodiments, referring to Figure 10 , along the length direction X, the thickness of the base body 121 is S5 mm, satisfying: 1.2 mm ≤ S5 ≤ 2.5 mm. Specifically, the value of S5 can be any value among 1.2 mm, 1.5 mm, 1.8 mm, 2.0 mm, 2.3 mm, 2.5 mm or any value within the range value composed of any two of these values.

[0074] In some embodiments, referring to Figure 10, along the length direction X, the height of the convex portion 122 is S6 mm, satisfying: 0.5S5 ≤ S6 ≤ 2.0S5. Combining with 1.2 mm ≤ S5 ≤ 2.5 mm, it can be obtained that 0.6 mm ≤ S6 ≤ 5.0 mm. Specifically, the value of S6 can be any value among 0.6 mm, 1.0 mm, 1.5 mm, 1.8 mm, 2.0 mm, 2.3 mm, 2.5 mm or any value within the range value composed of any two of these values. When the height S6 of the convex portion 122 is within the above range, the installation strength of the explosion-proof valve 40 on the end cover 12 can be ensured, and the single battery 1 is prevented from occupying too much space in the length direction X. Among them, the height S6 of the convex portion 122 is the distance between the surface of the convex portion 122 facing away from the base 121 along the length direction X and the surface of the base 121 facing away from the top cover assembly 30 along the length direction X.

[0075] In some embodiments, referring to Figure 9 , the base 121 has a dimension of S7 mm along the height direction Y, satisfying: 0.5W ≤ S7 ≤ 0.9W. Combining with 150 mm ≤ W ≤ 250 mm, it can be obtained that 75 mm ≤ S7 ≤ 225 mm. Specifically, the value of S7 can be any value among 75 mm, 100 mm, 125 mm, 142.5 mm, 150 mm, 170 mm, 200 mm, 220 mm, 225 mm or any value within the range value composed of any two of these values.

[0076] In some embodiments, referring to Figure 9 , the convex portion 122 has a dimension of S8 mm along the thickness direction Z, satisfying: 0.5H ≤ S8 ≤ 0.9H. Combining with 45 mm ≤ H ≤ 65 mm, it can be obtained that 22.5 mm ≤ S8 ≤ 58.5 mm. Specifically, the value of S8 can be any value among 22.5 mm, 30 mm, 40 mm, 42.75 mm, 45 mm, 50 mm, 55 mm, 58.5 mm or any value within the range value composed of any two of these values.

[0077] In some embodiments, referring to Figure 9 , the exhaust groove 120 has a dimension of S9 mm along the thickness direction Z, satisfying: 0.5S5 ≤ S9 ≤ 2.0S5. Combining with 1.2 mm ≤ S9 ≤ 2.5 mm, it can be obtained that 0.6 mm ≤ S9 ≤ 5.0 mm. Specifically, the value of S9 can be any value among 0.6 mm, 1.0 mm, 1.5 mm, 1.8 mm, 2.0 mm, 2.3 mm, 2.5 mm or any value within the range value composed of any two of these values. Specifically, the exhaust groove 120 includes two inner side walls oppositely arranged along the thickness direction Z, and S9 is the distance between the opposite surfaces of the two inner side walls.

[0078] In some embodiments, referring to Figure 11, a groove 123 is formed on one side of the end cap 12 facing the top cover assembly 30 along the length direction X. The groove 123 includes a groove bottom 1231 and a groove wall 1232 surrounding the groove bottom 1231 along the circumferential direction of the groove bottom 1231. The explosion-proof valve 40 is disposed on the groove bottom 1231. Along the height direction Y, one end of the exhaust groove 120 facing away from the exhaust member 50 penetrates through the adjacent groove wall 1232 to communicate with the groove 123. Specifically, one of the two opposite ends of the exhaust groove 120 along the height direction Y penetrates through the adjacent groove wall 1232, and the other end penetrates through the end cap 12, so that the exhaust groove 120 forms a through groove structure, enabling the gas in the first guide groove 51 on the exhaust member 50 to be discharged to the groove 123 through the exhaust groove 120 and discharged to the outside of the single cell 1 through the explosion-proof valve 40 disposed on the groove bottom 1231. Instead of providing a protrusion, a groove 123 is formed on the side of the end cap 12 facing the top cover assembly 30, and the explosion-proof valve 40 is disposed on the groove bottom 1231 of the groove 123. The formation of the groove 123 causes the explosion-proof valve 40 to be spaced from the main body portion 21 in the length direction X. The spacing between the explosion-proof valve 40 and the main body portion 21 in the length direction X allows the gas generated by the main body portion 21 to be discharged from the explosion-proof valve 40. In some implementation manners, an insulating member is disposed on one side of the end cap 12 in the length direction X to increase the spacing between the explosion-proof valve 40 and the main body portion 21 in the length direction X.

[0079] In some embodiments, referring to Figure 11 , a second through hole 124 penetrating the groove bottom 1231 along the length direction X is formed on the groove bottom 1231, and the explosion-proof valve 40 is embedded in the second through hole 124.

[0080] In some embodiments, the end cap 12 has a flat plate structure, and the explosion-proof valve 40 is disposed on the end cap 12. To ensure the spacing between the explosion-proof valve 40 and the main body portion 21, an insulating member needs to be disposed on the side of the end cap 12 facing the top cover assembly 30, so that the explosion-proof valve 40 is spaced from the main body portion 21 in the length direction X, enabling the gas generated by the main body portion 21 to be smoothly discharged from the explosion-proof valve 40 and preventing a short circuit due to too small a spacing between the explosion-proof valve 40 and the main body portion 21, thus ensuring the use safety of the single cell 1.

[0081] In some embodiments, referring to Figure 5 , a patch 41 is disposed on the side of the explosion-proof valve 40 facing away from the top cover assembly 30 in the length direction X. The patch 41 can protect the explosion-proof valve 40 and prevent external particles and other contaminants from entering the accommodation cavity 101 of the housing 10 through the explosion-proof valve 40.

[0082] In some embodiments, referring to Figure 3 、 Figures 6 to 8 and Figure 13, at least one first through hole 52 penetrating the exhaust member 50 in the height direction Y is formed in the exhaust member 50. The first through hole 52 divides the first guide groove 51 into at least two air guide grooves 511 spaced apart in the length direction X. The at least two air guide grooves 511 are communicated through the first through hole 52, that is, two adjacent air guide grooves 511 in the length direction X are communicated through the first through hole 52. The formation of the first through hole 52 enables the gas generated on the opposite two sides of the main body portion 21 in the electrode assembly 20 in the height direction Y to be discharged through the first through hole 52 and discharged from the explosion-proof valve 40 along the length direction X through the air guide grooves 511, thereby improving the exhaust efficiency of the main body portion 21 and ensuring the use safety of the single cell 1.

[0083] In some embodiments, referring to Figure 3 and Figures 6 to 7 , a second guide groove 53 is formed on one side of the exhaust member 50 facing away from the main body portion 21 in the height direction Y. The second guide groove 53 extends in the thickness direction Z. Along the thickness direction Z, one end of the second guide groove 53 is communicated with the first through hole 52, and the other end penetrates the exhaust member 50, so that the second guide groove 53 forms a through groove structure on the exhaust member 50, and further enables the gas generated on the opposite two sides of the main body portion 21 in the thickness direction Z to be discharged into the first through hole 52 through the second guide groove 53 and discharged from the explosion-proof valve 40 along the length direction X through the air guide grooves 511, thereby improving the exhaust efficiency of the main body portion 21 and ensuring the use safety of the single cell 1.

[0084] In some embodiments, referring to Figure 3 and Figures 6 to 7 , a third guide groove 54 is formed on one side of the exhaust member 50 facing away from the main body portion 21 in the height direction Y. The third guide groove 54 extends in the thickness direction Z. The number of the first through holes 52 is at least two, and the at least two first through holes 52 are spaced apart in the length direction X to divide the first guide groove 51 into at least three air guide grooves 511 spaced apart. Specifically, in the embodiments shown in Figure 3 and Figures 6 to 7 , the number of the first through holes 52 is two to divide the first guide groove 51 into three air guide grooves 511 spaced apart. The third guide groove 54 penetrates the exhaust member 50 in the thickness direction Z. The third guide groove 54 intersects and communicates with the air guide groove 511 between two adjacent first through holes 52 in the length direction X. In other words, the third guide groove 54 intersects and communicates with the air guide groove 511 that communicates two adjacent first through holes 52 in the length direction X. The structural setting that the third guide groove 54 intersects and communicates with the air guide groove 511 enables the gas generated on the opposite two sides of the main body portion 21 in the thickness direction Z to enter the first guide groove 51 through the third guide groove 54, thereby improving the exhaust efficiency of the main body portion 21 and ensuring the use safety of the single cell 1.

[0085] In some embodiments, referring to Figure 7, the exhaust member 50 has a dimension S in the longitudinal direction X 10 mm, satisfying: 0.5L ≤ S 10 ≤ 0.8L, combined with 400mm ≤ L ≤ 550mm, it can be obtained that 200mm ≤ S 10 ≤ 440mm. Specifically, S 10 can be any value among 200mm, 250mm, 300mm, 350mm, 380mm, 400mm, 420mm, 440mm or any value within the range formed by any two of these values. When S 10 is within the above range, it enables the first guide groove 51 to have sufficient length in the longitudinal direction X, so that the gas generated at one end of the main body portion 21 adjacent to the pole column 31 can be discharged from the explosion-proof valve 40 through the first guide groove 51, ensuring the use safety of the single cell 1.

[0086] In some embodiments, referring to Figure 7 , the exhaust member 50 has a dimension S in the thickness direction Z 11 mm, satisfying: 0.5H ≤ S 11 ≤ 0.9H, combined with 45mm ≤ H ≤ 65mm, it can be obtained that 22.5mm ≤ S 11 ≤ 58.5mm. Specifically, S 11 can be any value among 22.5mm, 30mm, 40mm, 42.75mm, 45mm, 50mm, 55mm, 58.5mm or any value within the range formed by any two of these values. When S 11 is within the above range, the strength of the exhaust member 50 can be ensured, and thus the smoothness of exhaust can be ensured.

[0087] In some embodiments, the thickness of the exhaust member 50 in the height direction Y is 0.3mm to 1.5mm. Specifically, the thickness of the exhaust member 50 can be any value among 0.3mm, 0.5mm, 0.8mm, 1.0mm, 1.2mm, 1.5mm or any value within the range formed by any two of these values.

[0088] In some embodiments, referring to Figure 7 , the first through hole 52 has a dimension S in the longitudinal direction X 13 mm, satisfying: 0.2S 10 ≤ S 13 ≤ 0.8S 10 , combined with 200mm ≤ S 10 ≤ 440mm, it can be obtained that 40mm ≤ S 13 ≤ 352mm. Specifically, S 13The value can be any one of 40mm, 100mm, 150mm, 200mm, 250mm, 300mm, 320mm, 352mm or any value within the range formed by any two of these values. When S 13 is within the above range, it enables the gas generated by the main body portion 21 to smoothly pass through the first through-hole 52 and be discharged into the first guide groove 51, ensuring the smoothness of exhaust.

[0089] In some embodiments, referring to Figure 7 , the first through-hole 52 has a dimension S 12 mm in the thickness direction Z and satisfies: 0.5H ≤ S 12 ≤ 0.9H. Combining with 45mm ≤ H ≤ 65mm, it can be obtained that 22.5mm ≤ S 12 ≤ 58.5mm. Specifically, the value of S 12 can be any one of 22.5mm, 30mm, 40mm, 42.75mm, 45mm, 50mm, 55mm, 58.5mm or any value within the range formed by any two of these values. When S 12 is within the above range, it enables the gas generated by the main body portion 21 to smoothly pass through the first through-hole 52 and be discharged into the first guide groove 51, ensuring the smoothness of exhaust.

[0090] In some embodiments, referring to Figure 7 , the first guide groove 51 has a dimension S 14 mm in the thickness direction Z and satisfies: 2mm ≤ S 14 ≤ 10mm. Specifically, the value of S 14 can be any one of 2mm, 4mm, 6mm, 8mm, 10mm or any value within the range formed by any two of these values. When S 14 is within the above range, it enables the gas generated by the main body portion 21 to smoothly conduct within the first guide groove 51, ensuring the smoothness of exhaust.

[0091] In some embodiments, referring to Figure 7 , the second guide groove 53 has a dimension S 15 mm in the thickness direction Z and satisfies: 2mm ≤ S 15 ≤ 10mm. Specifically, the value of S 15 can be any one of 2mm, 4mm, 6mm, 8mm, 10mm or any value within the range formed by any two of these values. When S 15 is within the above range, it enables the gas generated by the main body portion 21 to smoothly pass through the second guide groove 53 and conduct to the first guide groove 51, ensuring the smoothness of exhaust.

[0092] In some embodiments, referring toFigure 7 , the third guide groove 54 has a dimension S in the thickness direction Z 16 mm, satisfying: 2mm ≤ S 16 ≤ 10mm. Specifically, the value of S 16 can be any value among 2mm, 4mm, 6mm, 8mm, 10mm or any value within the range formed by any two of these values. When the value of S 16 is within the above range, the gas generated by the main body 21 can smoothly pass through the third guide groove 54 and be conducted to the first guide groove 51, ensuring the smoothness of exhaust.

[0093] In some embodiments, referring to Figure 3 and Figures 12 to 14 , the single cell 1 further includes a first insulating film 23. The first insulating film 23 is a tetrahedral structure with openings at both opposite ends in the length direction X. The first insulating film 23 is sleeved on the main body 21 of the electrode assembly 20. Along the height direction Y, the first insulating film 23 wraps the relatively arranged first side surface 231 and second side surface 232. The first side surface 231 includes a first layer 2311 and a second layer 2312. The first layer 2311 and the second layer 2312 partially overlap to form an overlapping area 230. Along the height direction Y, an exhaust member 50 is provided on each of the first side surface 231 and the second side surface 232. The exhaust member 50 provided on the first side surface 231 is stacked with the first layer 2311 and the second layer 2312, and the first through hole 52 exposes a part of the overlapping area 230.

[0094] Wherein, the first insulating film 23 is formed by winding a breathable insulating film sheet along the circumferential direction of the main body 21 to form a coating on the main body 21, ensuring the insulating performance of the main body 21. Specifically, the first side surface 231 and the second side surface 232 of the first insulating film 23 form a coating on the two relatively arranged surfaces of the main body 21 along the height direction Y. The third side surface 233 and the fourth side surface 234 of the first insulating film 23 arranged relatively in the thickness direction Z form a coating on the two relatively arranged surfaces of the main body 21 along the thickness direction Z. In order to enable the first insulating film 23 to completely coat the main body 21, there needs to be an overlapping part on one side of the wound first insulating film 23 to avoid exposing the main body 21. Moreover, since the number of winding turns of the first insulating film 23 is only one turn, the first side surface 231 includes the first layer 2311 and the second layer 2312 stacked along the height direction Y, and the overlapping part of the first layer 2311 and the second layer 2312 forms the overlapping area 230. In other implementation manners, when the number of winding turns of the first insulating film 23 is two or more, the first side surface 231 can form a stacked structure of three or more layers.

[0095] During the use of the single cell 1, the main body 21 will expand. The first layer 2311 and the second layer 2312 corresponding to the overlapping area 230 are subjected to the extrusion force generated by the expansion, and there is a risk of warping. Furthermore, there is a risk that the main body 21 is exposed, resulting in a short circuit between the main body 21 and the housing 10. By providing the exhaust member 50 on the first side surface 231, the exhaust member 50 is stacked with the first layer 2311 and the second layer 2312 in the height direction Y. The exhaust member 50 can fix the first layer 2311 and the second layer 2312 corresponding to the overlapping area 230, prevent warping, and ensure the insulating coating of the first insulating film 23 on the main body 21. Moreover, the arrangement of the first through hole 52 on the exhaust member 50 exposing a part of the overlapping area 230 enables the gas generated by the main body 21 to pass through the first through hole 52 and then through the first guide groove 51 and be discharged from the explosion-proof valve 40 through the first guide groove 51, thereby ensuring the exhaust efficiency and exhaust stability and ensuring the use safety of the single cell 1.

[0096] In some embodiments, referring to Figures 15 to 16 , the opposite sides of the end wall 13 of the housing 10 in the thickness direction Z are respectively connected to the adjacent side walls 14. The connection between the side wall 14 and the end wall 13 forms a first corner 110 on the side facing the accommodation cavity 101. Specifically, the connections between the first end wall 131 and the first side wall 141 and the second side wall 142 both form a first corner 110 on the side facing the accommodation cavity 101. Similarly, the connections between the second end wall 132 and the first side wall 141 and the second side wall 142 both form a first corner 110 on the side facing the accommodation cavity 101.

[0097] Referring to Figures 15 to 16 , the main body 21 includes two end faces 211 oppositely arranged in the height direction Y and two wall faces 212 oppositely arranged in the thickness direction Z. The opposite sides of the end face 211 in the thickness direction Z are respectively connected to the adjacent wall 212. The connection between the wall face 212 and the end face 211 forms a second corner 210 on the side facing the housing 10. Specifically, the two end faces 211 include a first end face 2111 and a second end face 2112, the two wall faces 212 include a first wall face 2121 and a second wall face 2122. The first end face 2111, the first wall face 2121, the second end face 2112, and the second wall face 2122 are sequentially connected end to end. The connections between the first end face 2111 and the first wall face 2121 and the second wall face 2122 both form a second corner 210 on the side facing the housing 10. Similarly, the connections between the second end face 2112 and the first wall face 2121 and the second wall face 2122 both form a second corner 210 on the side facing the housing 10.

[0098] Referring to Figure 16 , there is a first gap 501 between the exhaust member 50 and the adjacent end wall 13 in the height direction Y, and there is a second gap 213 between the second corner 210 and the adjacent first corner 110.

[0099] Among them, the main body portion 21 includes a positive electrode plate, a separator, and a negative electrode plate. In some implementation manners, the positive electrode plate, the separator, and the negative electrode plate are stacked along the thickness direction Z to form a stacked structure of the main body portion 21. In some implementation manners, the positive electrode plate, the separator, and the negative electrode plate are wound after being stacked along the thickness direction Z to form a wound structure of the main body portion 21.

[0100] For the main body portion 21 with a stacked structure, since the electrode plates do not need to be wound and bent, the corners of the electrode plates constitute the second corner portion 210 of the main body portion 21. When the main body portion 21 with a stacked structure expands, during the expansion process of the outermost electrode plate in the thickness direction Z, there is a situation where it contacts the inner corner of the housing 10 and causes the electrode plate to bend, resulting in damage to the main body portion 21 and affecting the use safety of the single cell 1.

[0101] In the single cell 1 provided by the embodiment of the present application, by providing exhaust members 50 on opposite sides of the main body portion 21 along the height direction Y, there is a first gap 501 between the exhaust members 50 and the end wall 13 of the adjacent housing 10, so as to increase the distance between the main body portion 21 and the housing 10 in the height direction Y, and further increase the second gap 213 between the second corner portion 210 of the main body portion 21 and the first corner portion 110 of the main body 11, thereby preventing the electrode plate at the second corner portion 210 of the main body portion 21 from contacting the main body 11 of the housing 10 and causing bending after the main body portion 21 expands, forming protection for the main body portion 21 and improving the use safety of the single cell 1.

[0102] Among them, referring to Figure 1 、 Figures 3 to 4 , the top cover assembly 30 further includes an insulating member 33. The top cover plate 32 and the insulating member 33 are stacked along the length direction X. The pole column 31 penetrates through the top cover plate 32 and the insulating member 33 along the length direction X and is connected to the tab 22. The insulating member 33 is provided with a liquid injection hole 34 that penetrates through the insulating member 33 along the length direction X, and the liquid injection hole 34 is used to inject electrolyte into the accommodation cavity 101 of the housing 10.

[0103] Referring to Figure 3 , the single cell 1 further includes a connecting piece 70, and the pole column 31 is connected to the tab 22 through the connecting piece 70.

[0104] The technical solutions provided by the embodiments of the present application have been introduced in detail above. Specific examples are used in this article to elaborate on the principles and implementation manners of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A single cell battery, wherein the single cell battery has a length direction, a height direction and a thickness direction intersecting with each other, characterized in that: The single battery has a dimension L mm along the length direction, a dimension W mm along the height direction, and a dimension H mm along the thickness direction, satisfying: L>W>H; The single cell battery comprises: A housing having an opening and a receiving cavity communicating with the opening; An electrode assembly, disposed in the accommodating cavity; A top cover assembly, the top cover assembly comprising a pole and a top cover sheet, the top cover sheet covers the opening, the pole is arranged on the top cover sheet and connected to the electrode assembly; An explosion-proof valve, arranged at one end of the housing away from the top cover assembly along the length direction; An exhaust member, along the height direction, the exhaust member is arranged on at least one of the two opposite sides of the electrode assembly, and a first guide groove extending along the length direction is formed on a side of the exhaust member away from the electrode assembly; Along the length direction, the first guide groove passes through the exhaust member, and when the explosion-proof valve is opened, the gas generated by the electrode assembly adjacent to one end of the pole can be discharged from the explosion-proof valve through the first guide groove.

2. The single cell according to claim 1, characterized in that: The housing comprises a body and an end cover; Along the length direction, the end cover is arranged at one end of the body away from the top cover assembly, the explosion-proof valve is arranged on the end cover, and a side of the end cover facing the top cover assembly is provided with an exhaust groove extending along the height direction; Along the height direction, one end of the exhaust groove faces the explosion-proof valve, and the other end passes through an end of the end cover adjacent to the exhaust member; The gas in the first guide groove can be discharged to the explosion-proof valve through the exhaust groove.

3. The single cell according to claim 2, characterized in that: The end cap includes a base; Along the length direction, part of the base body protrudes in a direction away from the top cover assembly to form a protrusion, so as to form a concave cavity on a side of the base body facing the top cover assembly, the explosion-proof valve is arranged on the protrusion, and the exhaust groove is arranged on a side of the base body facing the top cover assembly; Along the height direction, one end of the exhaust groove away from the exhaust member passes through the connection between the protruding portion and the base to communicate with the concave cavity.

4. The single cell according to claim 2, characterized in that: The end cover is provided with a groove on one side facing the top cover assembly along the length direction, the groove comprising a groove bottom and a groove wall surrounding the groove bottom along the circumferential direction of the groove bottom, and the explosion-proof valve is arranged at the groove bottom; Along the height direction, one end of the exhaust groove away from the exhaust member passes through the adjacent groove wall to communicate with the recessed groove.

5. The single cell according to claim 1, characterized in that: The exhaust member is provided with at least one first through hole penetrating the exhaust member along the height direction; Along the length direction, the first through hole divides the first guide groove into at least two air guide grooves that are spaced apart from each other, and at least two of the air guide grooves are connected through the first through hole.

6. The single cell according to claim 5, characterized in that: A second guide groove is formed on a side of the exhaust member away from the electrode assembly along the height direction, and the second guide groove extends along the thickness direction; Along the thickness direction, one end of the second guide groove is communicated with the first through hole, and the other end passes through the exhaust member.

7. The single cell according to claim 6, characterized in that: A third guide groove is formed on a side of the exhaust member away from the electrode assembly along the height direction, and the third guide groove extends along the thickness direction; The number of the first through holes is at least two, and along the length direction, at least two of the first through holes are arranged at intervals to divide the first guide groove into at least three air guide grooves arranged at intervals; The third guide groove penetrates the exhaust member along the thickness direction, and the third guide groove intersects and communicates with the air guide groove between two adjacent first through holes in the length direction.

8. The single cell according to claim 5, characterized in that: The single cell further includes a first insulating film; The electrode assembly comprises a main body and a pole ear, wherein the pole ear is arranged at one end of the main body along the length direction facing the top cover sheet, and the pole is connected to the pole ear; The first insulating film is a tetrahedral structure with openings at two opposite ends along the length direction, and the first insulating film is sleeved on the main body; Along the height direction, the first insulating film includes a first side surface and a second side surface that are oppositely disposed, the first side surface includes a first layer and a second layer, and the first layer and the second layer partially overlap to form an overlapping area; Along the height direction, one exhaust member is disposed on the first side surface and one exhaust member is disposed on the second side surface respectively. The exhaust member disposed on the first side surface overlaps with the first layer and the second layer, and the first through hole exposes a portion of the overlapping area.

9. The single cell according to claim 1, characterized in that: The shell comprises a body, the body comprises two end walls arranged oppositely along the height direction and two side walls arranged oppositely along the thickness direction, the end walls are respectively connected to the adjacent side walls at opposite sides along the thickness direction, and the connection between the side wall and the end wall forms a first corner portion facing one side of the accommodating cavity; The electrode assembly comprises a main body and a tab, wherein the tab is arranged at one end of the main body along the length direction facing the top cover sheet; The main body comprises two end surfaces arranged opposite to each other in the height direction and two wall surfaces arranged opposite to each other in the thickness direction, the end surfaces are respectively connected to adjacent wall surfaces at opposite sides in the thickness direction, and the connection between the wall surface and the end surface forms a second corner portion toward one side of the shell; A first gap exists between the exhaust member and the adjacent end wall; A second gap exists between the second corner portion and the adjacent first corner portion.

10. An electrical device, characterized in that: The invention comprises the single cell according to any one of claims 1 to 9.

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