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 arranges an explosion-proof valve on a wall surface of a shell, the explosion-proof valve comprises a body and a first connecting part, the first connecting part surrounds the body, the body is connected with the wall surface through the first connecting part, and a first concave part is arranged on the wall surface provided with the explosion-proof valve; the first concave part surrounds the explosion-proof valve in the circumferential direction of the explosion-proof valve, at least part of the first connecting part protrudes in the thickness direction of the wall face where the explosion-proof valve is located to form a first protruding part, and the first concave part and the first protruding part are matched to form a double-buffering structure for stress generated in the assembling process of the explosion-proof valve and the wall face. Therefore, in the subsequent assembly and use process of the single battery, the double buffer structure can release stress accumulated by the anti-explosion valve in the assembly process of the anti-explosion valve and the wall surface, the anti-explosion valve is prevented from being damaged due to stress accumulation, the use reliability of the anti-explosion valve is improved, the use safety of the single battery is improved, and the service life of the single battery is prolonged.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a single cell battery and electrical equipment. Background Art

[0002] During the assembly process of the explosion-proof valve of the existing single battery, the explosion-proof valve and the top cover plate or the shell are usually assembled through an integrated molding process or a welding assembly process. However, regardless of the integrated molding or welding assembly process, stress accumulation will be formed between the explosion-proof valve and the top cover plate or the shell where it is located. During the subsequent manufacturing and use of the single battery, the accumulated stress will affect the reliability of the explosion-proof valve, and thus affect the safety of the single battery. Utility Model Content

[0003] The purpose of the present application is to provide a single cell and an electrical device to solve the problem that stress accumulation occurs during the assembly process of the explosion-proof valve of the current single cell, resulting in reduced reliability of the explosion-proof valve.

[0004] A first aspect of an embodiment of the present application provides a single cell battery, comprising: a shell having a housing provided therein, the shell having a wall surface; an electrode assembly disposed in the housing cavity; an explosion-proof valve, the wall surface being provided with an exhaust port connected to the housing cavity, the explosion-proof valve being disposed on the wall surface, the explosion-proof valve comprising a connected main body and a first connecting portion, the first connecting portion surrounding the main body along a circumferential direction of the main body, the main body being connected to the wall surface through the first connecting portion; a first recessed portion being provided on the wall surface, the first recessed portion surrounding the explosion-proof valve along a circumferential direction of the explosion-proof valve, and at least a portion of the first connecting portion protruding along the thickness direction of the wall surface to form a first protruding portion.

[0005] Optionally, a second protrusion is provided on the wall surface, the second protrusion is formed to protrude along the thickness direction of the wall surface, and the first recess surrounds the second protrusion along the circumferential direction of the second protrusion.

[0006] Optionally, the wall surface has a side wall surrounding the exhaust port in the circumferential direction of the exhaust port, and the main body is connected to the side wall through the first connecting part; the main body, the first connecting part and the side wall are integrally formed, or the first connecting part is welded to the side wall.

[0007] Optionally, a second recessed portion is provided on the side wall, and the second recessed portion surrounds the explosion-proof valve along the circumferential direction of the explosion-proof valve.

[0008] Optionally, the second raised portion surrounds the explosion-proof valve along the circumferential direction of the explosion-proof valve, a first cavity is defined between the second raised portion and the explosion-proof valve, and a second cavity is defined inside the first recessed portion; along the thickness direction of the wall, a groove is provided on the side of the second raised portion facing away from the explosion-proof valve to connect the first cavity and the second cavity.

[0009] Optionally, along the thickness direction of the wall, part of the body protrudes in a direction close to the electrode assembly to form the third protrusion, or part of the body protrudes in a direction away from the electrode assembly to form the third protrusion.

[0010] Optionally, the body has a second connecting portion surrounding the third protrusion along the circumferential direction of the body, and the body is connected to the first connecting portion through the second connecting portion; along the thickness direction of the wall, the second connecting portion protrudes toward the direction close to the electrode assembly to form a fourth protrusion.

[0011] Optionally, the main body has a midpoint, and at least two third recessed portions are provided on the main body, and the third recessed portions extend from the midpoint as a starting point toward the direction close to the edge of the main body, and at least two of the third recessed portions intersect and are connected at the midpoint; along the extension direction of the third recessed portions, among at least two of the third recessed portions, the thickness of the main body located between two adjacent third recessed portions increases from the end close to the midpoint to the end away from the midpoint.

[0012] Optionally, the single cell battery further includes a top cover assembly, the top cover assembly including a top cover sheet and a pole, the pole portion being passed through the top cover sheet; the electrode assembly includes a main body and a pole tab connected to the main body, the pole being connected to the pole tab; an opening communicating with the accommodating cavity is provided on the shell, the top cover sheet covers the opening; the top cover sheet is one of the wall surfaces of the shell, and the explosion-proof valve is provided on the top cover sheet.

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

[0014] In summary, the embodiments of the present application provide a single cell and an electrical device having the single cell, wherein the single cell sets an explosion-proof valve on the wall of the shell, the explosion-proof valve includes a main body and a first connecting portion, the first connecting portion surrounds the main body along the circumferential direction of the main body, the main body is connected to the wall through the first connecting portion, and a first recessed portion is provided on the wall where the explosion-proof valve is provided, the first recessed portion surrounds the explosion-proof valve along the circumferential direction of the explosion-proof valve, and part of the first connecting portion protrudes along the thickness direction of the wall where the explosion-proof valve is located to form a first protruding portion, the coordinated design of the first recessed portion and the first protruding portion can form a double buffer structure for the stress generated during the assembly process of the explosion-proof valve and the wall, so that during the subsequent assembly and use of the single cell, the double buffer structure can release the stress accumulated in the explosion-proof valve during the assembly process of the explosion-proof valve and the wall, thereby avoiding damage to the explosion-proof valve due to stress accumulation, improving the reliability of the use of the explosion-proof valve, and thereby improving the safety and service life 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 application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

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

[0017] Figure 2 yes Figure 1 Exploded diagram of some components;

[0018] Figure 3 This is a schematic diagram of the first structure of the combination of the top cover sheet and the explosion-proof valve in the single cell provided in the embodiment of the present application;

[0019] Figure 4 yes Figure 3 AA section view;

[0020] Figure 5 yes Figure 4 A schematic diagram of the enlarged structure at point B;

[0021] Figure 6 This is another structural schematic diagram of the first recessed portion in the single cell provided in an embodiment of the present application;

[0022] Figure 7 This is a schematic diagram of a second structure of the combination of the top cover sheet and the explosion-proof valve in the single cell provided in the embodiment of the present application;

[0023] Figure 8 yes Figure 7 CC sectional view;

[0024] Figure 9 yes Figure 8 A schematic diagram of the structure at D of FIG.

[0025] Figure 10 This is another structural schematic diagram of the first protrusion in the explosion-proof valve of the single cell provided in an embodiment of the present application;

[0026] Figure 11 This is a schematic structural diagram of a single cell provided by an embodiment of the present application in which a second recessed portion is provided on the wall surface;

[0027] Figure 12 This is a schematic diagram of a third structure of the combination of the top cover sheet and the explosion-proof valve in the single cell provided in the embodiment of the present application;

[0028] Figure 13 yes Figure 12 EE cross-sectional view;

[0029] Figure 14 yes Figure 13 The enlarged structural diagram of F;

[0030] Figure 15 This is a schematic diagram of a third structure of the combination of the top cover sheet and the explosion-proof valve in the single cell provided in the embodiment of the present application;

[0031] Figure 16 yes Figure 15 GG cross-sectional view;

[0032] Figure 17 yes Figure 16 A schematic diagram of the structure at H is enlarged;

[0033] Figure 18 This is a fourth structural diagram of the combination of the top cover sheet and the explosion-proof valve in the single cell provided in the embodiment of the present application;

[0034] Figure 19 yes Figure 18 A schematic diagram of the enlarged structure at position I;

[0035] Figure 20 This is a schematic diagram of the fifth structure of the combination of the top cover sheet and the explosion-proof valve in the single cell provided in the embodiment of the present application;

[0036] Figure 21 This is a sixth structural diagram of the combination of the top cover sheet and the explosion-proof valve in the single cell provided in the embodiment of the present application;

[0037] Figure 22 yes Figure 21 JJ sectional view;

[0038] Figure 23 yes Figure 22 Schematic diagram of the enlarged structure at K;

[0039] Figure 24 This is a seventh structural diagram of the combination of the top cover sheet and the explosion-proof valve in the single cell provided in the embodiment of the present application;

[0040] Figure 25 This is a schematic diagram of the second structure of the single cell provided in the embodiment of the present application;

[0041] Figure 26 This is a schematic diagram of the first structure of the combination of the shell and the explosion-proof valve in the single cell provided in the embodiment of the present application;

[0042] Figure 27 This is a schematic diagram of a second structure of the combination of the shell and the explosion-proof valve in the single cell provided in the embodiment of the present application;

[0043] Figure 28 yes Figure 27 A top view of

[0044] Figure 29 yes Figure 28 LL cross-sectional view;

[0045] Figure 30 yes Figure 29 A schematic diagram of the structure at position M of FIG.

[0046] Figure 31 yes Figure 27 The schematic diagram of the structure after the explosion-proof valve is opened is shown;

[0047] Figure 32 yes Figure 31 Schematic diagram of the enlarged structure at N.

[0048] Description of main reference numerals:

[0049] 1. Single battery;

[0050] 10. Housing, 101. Accommodating cavity, 102. Opening, 11. Wall, 110. Exhaust port, 111. First wall, 112. Second wall, 113. Third wall, 114. Fourth wall, 115. Fifth wall, 116. Sixth wall, 12. First recessed portion, 120. Second cavity, 13. Second raised portion, 14. Sidewall, 15. Second recessed portion, 16. Groove, 17. Fifth recessed portion, 18. Sixth recessed portion;

[0051] 20. Electrode assembly, 21. Main body, 22. Tabs, 221. Positive tab, 222. Negative tab;

[0052] 30. Explosion-proof valve, 301. First cavity, 31. Main body, 311. First surface, 312. Second surface, 313. Third raised portion, 314. Second connecting portion, 315. Fourth raised portion, 316. Middle point, 317. Third recessed portion, 32. First connecting portion, 321. First raised portion, 33. Notch, 34. Patch;

[0053] 40. Top cover assembly, 41. Top cover sheet, 42. Post, 421. Positive post, 422. Negative post;

[0054] X, first direction, Y, second direction, Z, third direction. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solutions and beneficial effects of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for the purpose of explaining this application and are not intended to limit this application.

[0056] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.

[0057] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, direct connections, or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0058] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0059] In the examples, "parallel" refers to a state where the angle formed between two lines, between a line and a plane, or between two planes is between -1° and 1°. Furthermore, "perpendicular" refers to a state where the angle formed between two lines, between a line and a plane, or between two planes is between 89° and 91°. Equal distances or equal angles refer to a state where the tolerance range is between -1% and 1%.

[0060] In the application embodiments, "surrounding" refers to a direct connection between a first feature and a second feature, and "encircling" refers to an indirect connection between a first feature and a second feature.

[0061] The present embodiment provides an electrical device including a single cell battery 1, which serves as a power source for the electrical device. The electrical device may include, but is not limited to, mobile devices (e.g., mobile phones, laptops, etc.), electric vehicles (e.g., pure electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, electric bicycles, electric scooters, electric golf carts, electric trucks, etc.), electric trains, ships, satellites, energy storage systems, etc.

[0062] In some embodiments of the present application, a single cell 1 is provided, referring to Figure 1 The single battery 1 includes a housing 10 , an electrode assembly 20 and an explosion-proof valve 30 .

[0063] Reference Figures 1 to 32 The housing 10 has a first direction X, a second direction Y and a third direction Z that intersect each other. Figures 1 to 32 In the embodiment shown, the first direction X, the second direction Y and the third direction Z are orthogonal to each other, the housing 10 is in the shape of a square, the first direction X is parallel to the length direction of the housing 10, the second direction Y is parallel to the width direction of the housing 10, and the third direction Z is parallel to the height direction of the housing 10. Figure 2 The housing 10 has a housing cavity 101 inside, and the housing 10 has a wall 11. Specifically, referring to Figures 1 and 2 as well as Figures 25 to 32The wall 11 includes a first wall 111 and a second wall 112 arranged opposite to each other along a first direction X, a third wall 113 and a fourth wall 114 arranged opposite to each other along a second direction Y, and a fifth wall 115 and a sixth wall 116 arranged opposite to each other along a third direction Z. The first wall 111, the third wall 113, the second wall 112, and the fourth wall 114 are sequentially connected end to end to form a tetrahedron structure with two open ends. The fifth wall 115 and the sixth wall 116 cover the two open ends respectively. The first wall 111 and the second wall 112 have the largest surface area. Figures 5 and 6 、 Figures 9 to 11 、 Figure 14 、 Figures 17 to 19 as well as Figures 22 and 23 An exhaust port 110 communicating with the accommodating cavity 101 is provided on the wall 11 .

[0064] Reference Figure 2 The electrode assembly 20 is arranged in the accommodating cavity 101. The electrode assembly 20 includes a main body 21 and a tab 22 connected to the main body 21. The main body 21 includes a positive electrode sheet, a separator and a negative electrode sheet. The positive electrode sheet, the separator and the negative electrode sheet are stacked to form a laminated electrode assembly, or the positive electrode sheet, the separator and the negative electrode sheet are stacked and then wound to form a wound electrode assembly. The tab 22 includes a positive tab 221 and a negative tab 222. The positive tab 221 is connected to the positive electrode sheet after winding or stacking. The negative electrode tab 222 is connected to the wound or stacked negative electrode sheet. In other words, the positive electrode tab 221 is formed by cutting the portion of the positive electrode sheet not coated with the positive electrode active material layer, or the positive electrode tab 221 is welded to the portion of the positive electrode sheet not coated with the positive electrode active material layer, and the negative electrode tab 222 is formed by cutting the portion of the negative electrode sheet not coated with the negative electrode active material layer, or the negative electrode tab 222 is welded to the portion of the negative electrode sheet not coated with the negative electrode active material layer. The positive electrode tab 221 includes multiple positive electrode tabs, which are stacked along the thickness of the main body 21 to form the positive electrode tab 221, and the negative electrode tab 222 includes multiple negative electrode tabs, which are stacked along the thickness of the main body 21 to form the negative electrode tab 222.

[0065] Reference Figures 2 to 24 as well as Figure 26, the explosion-proof valve 30 is arranged on the wall 11 of the shell 10, and the explosion-proof valve 30 covers the exhaust port 110. The explosion-proof valve 30 includes a main body 31 and a first connecting portion 32 connected to each other. The first connecting portion 32 surrounds the main body 31 along the circumferential direction of the main body 31, that is, the first connecting portion 32 is directly connected to the main body 31, and the main body 31 is connected to the wall 11 through the first connecting portion 32. The gas generated by the electrode assembly 20 can be discharged from the explosion-proof valve 30. Specifically, the main body 31 is installed on the avoidance 11 of the shell 10 through the first connecting portion 32. During the use of the single battery 1, the main body 21 of the electrode assembly 20 will react with the electrolyte injected into the accommodating cavity 101 of the shell 10 and generate gas. The generated gas generates pressure on the explosion-proof valve 30, reaching the valve opening pressure preset by the explosion-proof valve 30, and the gas can be discharged from the explosion-proof valve 30. Wherein, referring to Figures 2 to 6 as well as Figures 12 to 14 The wall surface 11 on which the explosion-proof valve 30 is provided is provided with a first recessed portion 12. The first recessed portion 12 surrounds the explosion-proof valve 30 along the circumferential direction of the explosion-proof valve 30. Figures 9 and 10 At least a portion of the first connection portion 32 protrudes along the thickness direction of the wall surface 11 to form a first protrusion 321.

[0066] During the assembly process of the explosion-proof valve of the single cell, the explosion-proof valve is usually assembled using an one-piece molding or welding molding process to ensure the sealing of the explosion-proof valve. The one-piece molding is to stamp the explosion-proof valve on the wall surface of the shell of the single cell. However, during the one-piece molding process, stress accumulation will be formed between the explosion-proof valve and the wall surface of the shell. The welding molding is to weld the explosion-proof valve to the wall surface of the shell. During the welding molding process, welding stress accumulation will also be formed between the explosion-proof valve and the wall surface of the shell. Therefore, in the subsequent manufacturing, assembly and use of the single cell, the stress accumulated by the one-piece molding or welding molding will affect the reliability of the explosion-proof valve, resulting in an increased risk of cracks or even cracks between the explosion-proof valve and the wall surface, affecting the reliability of the explosion-proof valve, and then affecting the safety of the single cell.

[0067] The single battery 1 provided in the embodiment of the present application sets the explosion-proof valve 30 on the wall 11 of the shell 10, and the explosion-proof valve 30 covers the exhaust port 110 on the wall 11. The explosion-proof valve 30 includes a body 31 and a first connecting portion 32. The first connecting portion 32 surrounds the body 31 along the circumferential direction of the body 31. The body 31 is connected to the wall 11 through the first connecting portion 32, and a first recessed portion 12 is set on the wall 11 where the explosion-proof valve 30 is set. The first recessed portion 12 surrounds the explosion-proof valve 30 along the circumferential direction of the explosion-proof valve 30, and part of the first connecting portion 32 protrudes along the thickness direction of the wall 11 where the explosion-proof valve 30 is located to form a first protrusion 321. The setting of the first recessed portion 12 can form a gap between the explosion-proof valve 30 and the wall 11 of the shell 10 during the assembly process. The accumulated stress (stress accumulated by integral molding or welding molding) is buffered and released. The setting of the first protrusion 321 can buffer and release the stress (stress accumulated by integral molding or welding molding) accumulated between the main body 31 of the explosion-proof valve 30 and the wall 11 during the assembly process. Therefore, through the coordinated setting of the first protrusion 321 and the first recessed portion 12, a double buffer structure for the stress accumulated between the explosion-proof valve 30 and the wall 11 is formed, avoiding the risk of cracks or even fissures in the explosion-proof valve 30 due to the accumulated stress during subsequent assembly and use, improving the reliability of the explosion-proof valve 30, and avoiding the explosion-proof valve 30 from opening before reaching the preset valve opening pressure, thereby improving the safety and service life of the single battery 1.

[0068] In some embodiments, the first recessed portion 12 surrounds the explosion-proof valve 30 along its circumferential direction. The groove formed by the first recessed portion 12 on the wall surface 11 where the explosion-proof valve 30 is located is an annular groove, forming a closed-loop structure. In some implementations, the groove formed by the first recessed portion 12 on the wall surface 11 where the explosion-proof valve 30 is located is an open-loop structure, which can be selected based on actual usage requirements.

[0069] In some embodiments, reference Figures 3 to 5 as well as Figures 12 to 14 , along the thickness direction of the wall surface 11 where the explosion-proof valve 30 is located, the first recessed portion 12 is provided on the outer surface of the wall surface 11 (i.e., the side of the wall surface 11 where the explosion-proof valve 30 is located away from the electrode assembly 20). In some embodiments, referring to Figure 6 The first recessed portion 12 is provided on the inner surface of the wall 11 (i.e., the side of the wall 11 where the explosion-proof valve 30 is located that faces the electrode assembly 20). The specific configuration can be selected based on actual use requirements, as long as the first recessed portion 12 surrounds the explosion-proof valve 30 along its circumferential direction.

[0070] In some embodiments, reference Figures 3 to 5 as well as Figures 12 to 14A second raised portion 13 is provided on the wall surface 11 where the explosion-proof valve 30 is disposed. The second raised portion 13 protrudes along the thickness direction of the wall surface 11. The first recessed portion 12 surrounds the second raised portion 13 along the circumferential direction of the second raised portion 13. The second raised portion 13 surrounds the explosion-proof valve 30 along the circumferential direction. The coordinated arrangement of the second raised portion 13 and the first recessed portion 12 further improves the buffering of stress accumulated between the explosion-proof valve 30 and the wall surface 11. The provision of the second raised portion 13 also improves the assembly strength between the explosion-proof valve 30 and the wall surface 11.

[0071] In some embodiments, reference Figure 9 , along the thickness direction of the wall surface 11 where the explosion-proof valve 30 is located, the first protrusion 321 is formed to protrude toward the electrode assembly 20. In some embodiments, referring to Figure 10 , along the thickness direction of the wall surface 11 where the explosion-proof valve 30 is located, the first protrusion 321 protrudes in a direction away from the electrode assembly 20. The specific selection can be made according to actual use requirements, and it is sufficient that a portion of the first connecting portion 32 protrudes along the thickness direction of the wall surface 11 to form the first protrusion 321.

[0072] In some embodiments, reference Figures 5 and 6 、 Figures 9 to 11 、 Figure 14 、 Figures 17 to 19 as well as Figures 22 and 23 The wall surface 11 has a side wall 14 surrounding the exhaust port 110 along the circumferential direction of the exhaust port 110 . The explosion-proof valve 30 is disposed in the exhaust port 110 . The body 31 of the explosion-proof valve 30 is inscribed in the side wall 14 through the first connecting portion 32 . In some implementations, the explosion-proof valve 30 is integrally formed with the wall 11. Specifically, a concave groove is stamped on the outer surface of the wall 11 (i.e., the side facing away from the electrode assembly 20 in the thickness direction), that is, the exhaust port 110 is a slot, and the main body 31 and the first connecting portion 32 of the explosion-proof valve 30 are formed by stamping at the bottom of the concave groove. The side wall surface of the concave groove forms the side wall 14 surrounding the exhaust port 110, thereby realizing the integral formation between the main body 31 of the explosion-proof valve 30, the first connecting portion 32 and the side wall 14 on the wall 11. The exhaust port 110 is connected to the accommodating chamber 101 through the explosion-proof valve 30, that is, when the explosion-proof valve 30 is opened, it connects the accommodating chamber 101 and the exhaust port 110 to discharge gas. In some implementations, the first connection portion 32 in the explosion-proof valve 30 is welded to the side wall 14. Specifically, the exhaust port 110 is a through hole that penetrates the wall 11 along the thickness direction of the wall 11. The explosion-proof valve 30 is welded to the side wall 14 through the first connection portion 32, thereby realizing a welding connection between the explosion-proof valve 30 and the wall 11.

[0073] In some embodiments, reference Figure 1A patch 34 is also provided on the wall 11 where the explosion-proof valve 30 is located. The patch 34 covers the end of the exhaust port 110 away from the electrode assembly 20 along the thickness direction of the wall 11 to form a cover for the explosion-proof valve 30 provided in the exhaust port 110 to prevent external dust, water vapor, etc. from contaminating the explosion-proof valve 30.

[0074] In some embodiments, reference Figure 3 、 Figure 5 as well as Figures 12 to 14 The second protrusion 13 surrounds the explosion-proof valve 30 along the circumferential direction of the explosion-proof valve 30, and a first cavity 301 is defined between the second protrusion 13 and the explosion-proof valve 30. The first recessed portion 12 surrounds the second protrusion 13 along the circumferential direction of the second protrusion 13. Figure 12 and Figure 14 The first recessed portion 12 defines a second cavity 120. Along the thickness direction of the wall 11, a groove 16 is formed on the side of the second raised portion 13 facing away from the explosion-proof valve 30 to connect the first cavity 301 with the second cavity 120. Figure 1 When the patch 34 is attached, it forms a cover for the first cavity 301. During the charge and discharge process of the single battery 1, the electrode assembly 20 generates gas, which causes the internal air pressure of the shell 10 to rise, and then causes the explosion-proof valve 30 to bulge and deform outward, thereby causing the air pressure in the first cavity 301 to rise, and then there is a risk of the patch 34 falling off. The opening of the groove 16 forms a connection between the first cavity 301 and the second cavity 120, so that part of the gas in the first cavity 301 can be discharged to the second cavity 120 through the groove 16, so that the air pressure in the first cavity 301 is balanced with the external air pressure, avoiding the patch 34 from falling off due to the internal and external pressure difference, and ensuring the reliability of the explosion-proof valve 30.

[0075] In some embodiments, reference Figure 11 A second recessed portion 15 is provided on the side wall 14 of the wall 11. The second recessed portion 15 surrounds the explosion-proof valve 30 in the circumferential direction of the explosion-proof valve 30. The second recessed portions 15 are arranged at intervals along the thickness direction of the wall 11. The arrangement of the second recessed portions 15 can form a buffer for the stress accumulated between the explosion-proof valve 30 and the wall 11, thereby ensuring the reliability of the explosion-proof valve 30.

[0076] In some embodiments, reference Figures 5 and 6 、 Figures 9 to 11 、 Figure 14 、 Figure 17 、 Figure 19 as well as Figure 23 The body 31 has a first surface 311 and a second surface 312 that are oppositely arranged along the thickness direction of the wall 11. The first surface 311 faces away from the electrode assembly 20, and the second surface 312 faces toward the electrode assembly 20. Figures 5 and 6 、 Figures 9 to 11 、 Figure 14 、 Figure 17 、 Figure 19 as well as Figure 23 The body 31 is provided with a notch 33. The notch 33 forms a weak portion on the body 31. That is, the thickness of the body 31 corresponding to the notch 33 is lower than the thickness of the body 31 outside the notch. When the preset pressure for opening the explosion-proof valve 30 is reached, the notch 33 explodes to connect the accommodating cavity 101 with the exhaust port 110, so that the gas is discharged from the explosion-proof valve 30. Figures 5 and 6 、 Figures 9 and 10 、 Figure 14 、 Figure 17 、 Figure 19 as well as Figure 23 In the embodiment shown, the notch 33 is provided on the first surface 311 of the body 31, specifically as shown in FIG. Figure 11 In the illustrated embodiment, the notch 33 is disposed on the second surface 312 of the body 31. The notch 33 is disposed on the second surface 312 facing the electrode assembly 20, thereby reducing contamination of the notch 33 by foreign matter such as dust and moisture, thereby improving the reliability of the explosion-proof valve 30. The notch 33 is C-shaped.

[0077] In some embodiments, reference Figures 15 to 23 , along the thickness direction of the wall 11, specifically, along the thickness direction of the wall 11 where the explosion-proof valve 30 is located, part of the body 31 protrudes to form a third protrusion 313. In some implementations, refer to Figures 15 to 17 、 Figure 20 as well as Figure 23 , part of the body 31 protrudes along the thickness direction of the wall 11 in the direction away from the electrode assembly 20 to form a third protrusion 313, thereby improving the space utilization rate of the shell 10 in the thickness direction of the wall 11 where the explosion-proof valve 30 is located. In some implementations, refer to Figures 18 and 19 as well as Figure 21 A portion of the body 31 protrudes along the thickness direction of the wall 11 toward the electrode assembly 20 to form a third protrusion 313. The provision of the third protrusion 313 can enhance the strength of the body 31 and buffer the stress accumulated between the explosion-proof valve 30 and the wall 11.

[0078] In some embodiments, reference Figure 20 The number of the third protrusions 313 is multiple and they are spaced apart along the length direction of the wall 11 where the explosion-proof valve 30 is located. Figure 20 In the illustrated embodiment, there are three third protrusions 313 .

[0079] In some embodiments, reference Figures 21 to 23The body 31 has a second connecting portion 314 surrounding the third protrusion 313 along the circumferential direction of the body 31. The body 31 is connected to the first connecting portion 32 via the second connecting portion 314. Along the thickness direction of the wall 11, that is, along the thickness direction of the wall 11 where the explosion-proof valve 30 is located, the second connecting portion 314 protrudes toward the direction close to the electrode assembly 20 to form a fourth protrusion 315. Figure 23 The notch 33 is provided on the second connecting portion 314. The provision of the fourth protrusion 315 makes the explosion-proof valve 30 as a whole close to the electrode assembly 20, thereby increasing the distance between the explosion-proof valve 30 and the wall 11 where the explosion-proof valve 30 is located. In the application condition where the single cell 1 is inverted, that is, the wall 11 of the explosion-proof valve 30 is provided toward the bottom surface of the battery box where the single cell 1 is located, the ball impact resistance performance of the single cell 1 can be improved, thereby improving the reliability and stability of the single cell 1.

[0080] In the above-mentioned embodiment, referring to Figures 1 to 24 The single cell 1 further includes a top cover assembly 40, which includes a top cover sheet 41 and a pole 42. The pole 42 is inserted into the top cover sheet 41 along the thickness direction of the top cover sheet 41. The pole 42 includes a positive pole 421 and a negative pole 422. Figure 2 The fifth wall 115 of the housing 10 is provided with an opening 102 that communicates with the accommodating chamber 101. The top cover sheet 41 covers the opening 102 to seal the accommodating chamber 101. The electrode posts 42 are connected to the tabs 22 in the electrode assembly 20. Specifically, the positive electrode post 421 is connected to the positive tab 221, and the negative electrode post 422 is connected to the negative tab 222. The top cover sheet 41 replaces at least a portion of the fifth wall 115 as the fifth wall 115. The explosion-proof valve 30 is disposed on the top cover sheet 41, which is equivalent to the explosion-proof valve 30 being disposed on the wall 11 as described above. The thickness direction of the top cover sheet 41 is the thickness direction of the wall 11, which is also the height direction Z of the housing 10. The wall surface 11 on which the explosion-proof valve 30 is provided is the top cover sheet 41. The wall surface 11 on which the explosion-proof valve 30 is located is the top cover sheet 41. The side of the wall surface 11 facing away from the electrode assembly 20 is the side of the top cover sheet 41 facing away from the electrode assembly 20 along the height direction Z. The side of the wall surface 11 facing the electrode assembly 20 is the side of the top cover sheet 41 facing the electrode assembly 20 along the height direction Z. The assembly method between the explosion-proof valve 30 and the top cover sheet 41 can be integrally formed or welded, and the specific selection is based on actual usage requirements.

[0081] In some embodiments, reference Figure 25 Along the height direction Z of the shell 10 , the explosion-proof valve 30 and the top cover piece 41 are arranged opposite to each other. Specifically, the explosion-proof valve 30 is arranged on the sixth wall 116 , and the top cover piece 41 is arranged on the fifth wall 115 .

[0082] In some embodiments, reference Figure 26The explosion-proof valve 30 is disposed on the third wall surface 113 of the housing 10 , and the top cover 41 covers the fifth wall surface 115 where the opening 102 is formed.

[0083] In some embodiments, reference Figures 27 to 31 The explosion-proof valve 30 includes a body 31. Specifically, the explosion-proof valve 30 only includes the body 31. The body 31 of the explosion-proof valve 30 has a middle point 316. At least two third recessed portions 317 are provided on the body 31. The third recessed portions 317 extend from the middle point 316 to the edge of the body 31. At least two third recessed portions 317 intersect and communicate at the middle point 316. Figure 30 Along the extension direction of the third recessed portion 317, among at least two third recessed portions 317, the thickness of the main body 31 located between two adjacent third recessed portions 317 increases from the end close to the midpoint 316 to the end away from the midpoint 316, thereby forming a structural design in which the thickness of the main body 31 changes in a slope.

[0084] Conventional explosion-proof valves with a constant-thickness substrate have a fixed pressure relief area when the valve is opened. Therefore, it is necessary to develop explosion-proof valves with different pressure relief areas based on the gas production volume and gas production speed of different single cells. This results in poor adaptability of the explosion-proof valve, which in turn increases the assembly cost of the single cells and reduces the assembly efficiency.

[0085] The single cell 1 provided in the embodiment of the present application is provided with a third recessed portion 317 on the body 31 of the explosion-proof valve 30. Specifically, the third recessed portion 317 is provided on the side of the body 31 facing away from the electrode assembly 20, and along the extension direction of the third recessed portion 317, the thickness of the body 31 located between two adjacent third recessed portions 317 increases from the end close to the midpoint 316 to the end away from the midpoint 316, thereby forming a gradient change design of the thickness of the body 31. When the gas production amount of the electrode assembly 20 inside the single cell 1 is small or the gas production speed is slow, the thickness of the body 31 is increased. Figure 32 The body 31 shown by the dotted line in the figure, after the explosion-proof valve 30 is opened to a certain extent, the gas production of the electrode assembly 20 and the pressure relief of the explosion-proof valve 30 reach a balance, and the thickness of the body 31 that is not opened is relatively large. When the balance is reached, the explosion-proof valve 30 will not further extend outward to release a larger pressure relief area. When the gas production of the electrode assembly 20 inside the single cell 1 is large or the gas production speed is fast, refer to Figure 32Regarding the body 31 shown by the solid line in the figure, after the explosion-proof valve 30 is opened to a certain degree, because the pressure relief area is insufficient to achieve a balance between the gas production of the electrode assembly 20 and the pressure relief of the explosion-proof valve 30, the internal gas causes the body 31 of the explosion-proof valve 30 to further extend along the extension direction of the third recess 317, away from the midpoint 316, thereby releasing a larger pressure relief area. This helps to quickly achieve a balance between gas production and pressure relief, thereby ensuring the reliability of the single cell 1. Therefore, the structural design in which the thickness of the body 31 varies on a sloped surface can automatically adjust the opening degree of the body 31 of the explosion-proof valve 30 to accommodate single cells 1 with different gas production volumes and gas production rates, achieving universal applicability, reducing the number of explosion-proof valves 30 required, lowering the assembly cost of the single cells 1, and improving assembly efficiency.

[0086] In some embodiments, reference Figures 27 and 28 The number of the third recessed portions 317 on the body 31 is four. The four third recessed portions 317 intersect and communicate with each other at the middle point 316. The four third recessed portions 317 form a cross-shaped notch structure on the body 31. Figure 28 Along the circumferential direction of the body 31 , the angle between two adjacent third recessed portions 317 is α, which satisfies: 0°<α<180°.

[0087] In some embodiments, there are two third recesses 317, which intersect and communicate with each other at a midpoint 316, forming a V-shaped notch on the body 31. In other implementations, the number of third recesses 317 can be selected based on actual usage requirements, as long as the plurality of third recesses 317 intersect and communicate with each other at the midpoint 316.

[0088] The above is a detailed introduction to the technical solutions provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, based on the ideas of the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A single battery, characterized in that: The single battery comprises: A housing is provided with an accommodating cavity therein, and the housing has a wall surface; an electrode assembly, disposed in the accommodating cavity; An explosion-proof valve, wherein the wall surface is provided with an exhaust port communicating with the accommodating cavity, the explosion-proof valve is arranged on the wall surface and covers the exhaust port, the explosion-proof valve comprises a main body and a first connecting portion connected to each other, the first connecting portion surrounds the main body along the circumferential direction of the main body, and the main body is connected to the wall surface through the first connecting portion; A first recessed portion is provided on the wall surface, and the first recessed portion surrounds the explosion-proof valve along a circumferential direction of the explosion-proof valve. At least a portion of the first connecting portion protrudes along a thickness direction of the wall surface to form a first protruding portion.

2. The single cell according to claim 1, wherein: A second convex portion is provided on the wall surface. The second convex portion is formed to protrude along the thickness direction of the wall surface. The first concave portion surrounds the second convex portion along the circumferential direction of the second convex portion.

3. The single cell according to claim 1, wherein: The wall surface has a side wall surrounding the exhaust port along a circumferential direction of the exhaust port, and the body is inscribed in the side wall via the first connecting portion; The main body, the first connecting portion and the side wall are integrally formed, or the first connecting portion and the side wall are welded.

4. The single cell according to claim 3, wherein: A second recessed portion is provided on the side wall, and the second recessed portion surrounds the explosion-proof valve along the circumferential direction of the explosion-proof valve.

5. The single cell according to claim 2, wherein: The second protrusion surrounds the explosion-proof valve along a circumferential direction of the explosion-proof valve, a first cavity is defined between the second protrusion and the explosion-proof valve, and a second cavity is defined inside the first recessed portion; Along the thickness direction of the wall, a groove is provided on a side of the second protrusion facing away from the explosion-proof valve to connect the first cavity and the second cavity.

6. The single cell according to claim 1, wherein: Along the thickness direction of the wall surface, part of the body protrudes in a direction close to the electrode assembly to form a third protrusion, or part of the body protrudes in a direction away from the electrode assembly to form the third protrusion.

7. The single cell according to claim 6, wherein: The body has a second connection portion surrounding the third protrusion along a circumferential direction of the body, and the body is connected to the first connection portion through the second connection portion; Along the thickness direction of the wall surface, the second connection portion protrudes toward the electrode assembly to form a fourth protrusion.

8. The single cell according to claim 1, wherein: The body has a midpoint, and at least two third recessed portions are provided on the body. The third recessed portions extend from the midpoint as a starting point toward the edge of the body, and at least two third recessed portions intersect and communicate with each other at the midpoint. Along the extension direction of the third recessed portion, in at least two of the third recessed portions, the thickness of the body located between two adjacent third recessed portions increases from an end close to the midpoint to an end away from the midpoint.

9. The single cell according to claim 1, wherein: The single cell further includes a top cover assembly, the top cover assembly including a top cover sheet and a pole, wherein the pole portion is provided through the top cover sheet; The electrode assembly includes a main body and a tab connected to the main body, and the electrode column is connected to the tab; The shell is provided with an opening communicating with the accommodating cavity, and the top cover sheet covers the opening; The top cover piece is one of the wall surfaces of the shell, and the explosion-proof valve is arranged on the top cover piece.

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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