Single battery and electric device

Abstract

This application discloses a single-cell battery and an electrical device, belonging to the field of battery technology. The single-cell battery has at least one first rib on its top cover. The first rib includes at least one first segment and multiple second segments. The multiple second segments are spaced apart on both sides of the terminal post. The ends of the multiple second segments adjacent to the explosion-proof valve are respectively connected to the first segment. The distance between the multiple second segments is L1, and the value of L1 increases from the end closer to the explosion-proof valve to the end farther away from the explosion-proof valve. This allows the multiple second segments to extend and be arranged radially. When the top cover deforms, the connection design between the first segment and the second segment allows the first segment to block the deformation line generated by the deformation of the top cover, and the second segment to guide the deformation line and make it bypass the terminal post. This avoids the force generated by the deformation of the top cover causing the terminal post to bend, ensuring the sealing of the top cover to the single-cell battery casing and ensuring the safety of the single-cell battery in use.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a single-cell battery and an electrical device. Background Technology

[0002] When a single battery cell experiences thermal runaway or is subjected to external impact or collision, the gas production of the internal electrode assembly increases excessively, leading to excessively high internal pressure in the casing. This can cause the top cover plate in the top cover assembly to deform. The deformation area of ​​the top cover plate will pass through the terminal post area. The force generated by the deformation of the top cover plate can cause the terminal post to bend, which in turn can reduce or even fail the sealing performance of the top cover plate to the inside of the casing, affecting the safety of the single battery cell. Utility Model Content

[0003] The purpose of this application is to provide a single-cell battery and an electrical device to solve the problem that deformation of the top cover plate in current single-cell batteries leads to bending of the terminal post and decreased sealing performance, which affects the safety of single-cell battery use.

[0004] A first aspect of this application provides a single-cell battery having a first direction, a second direction, and a third direction intersecting each other. The single-cell battery includes: a top cover assembly including a top cover sheet and a terminal post, the terminal post being inserted into the top cover sheet, the top cover sheet having a first surface intersecting the third direction; an explosion-proof valve disposed on the first surface, the explosion-proof valve and the terminal post being spaced apart along the first direction; at least one first rib, the first rib protruding from at least one end along the third direction onto the top cover sheet, the first rib including a first segment and a plurality of second segments, the first segment extending along the second direction, the plurality of second segments extending along the first direction and spaced apart along the second direction on both sides of the terminal post, the ends of the plurality of second segments adjacent to the explosion-proof valve along the first direction being connected to the first segment; along the second direction, the distance between the plurality of second segments connected to the same first segment is L1 mm, and along the first direction, the value of L1 increases from the end closer to the explosion-proof valve to the end farther away from the explosion-proof valve.

[0005] Optionally, the single battery cell further includes at least one second rib and multiple third ribs; the second rib protrudes from at least one end along the third direction and is disposed on the top cover plate, and the second rib surrounds the explosion-proof valve in the circumferential direction; the third rib protrudes from at least one end along the third direction and is disposed on the top cover plate, one second segment corresponds to one third rib, the third rib extends along the first direction, and along the first direction, one end of the third rib along the first direction is connected to the second segment, and the other end is connected to the second rib; along the second direction, the distance between two third ribs located on the same side of the explosion-proof valve along the first direction is L2mm, and along the first direction, the value of L2 increases from the end closer to the explosion-proof valve to the end farther away from the explosion-proof valve.

[0006] Optionally, the first rib further includes at least one third segment, the third segment extending along the second direction, and along the first direction, the ends of the plurality of second segments away from the explosion-proof valve are respectively connected to the third segment; the first segment, the second segment and the third segment surround the pole post in the circumferential direction of the pole post.

[0007] Optionally, in the first direction, the first segment protrudes along one end adjacent to the explosion-proof valve to form a protrusion, the protrusion having a dimension L3mm along the second direction, and the value of L3 increasing from the end closer to the explosion-proof valve to the end farther away from the explosion-proof valve along the first direction.

[0008] Optionally, the single battery cell further includes a fourth rib, which includes a protrusion and a bend; the protrusion protrudes from the first surface along the third direction, and the protrusion surrounds the electrode post in the circumferential direction; along the third direction, the end of the protrusion away from the first surface bends towards the electrode post to form the bend; the first rib surrounds the protrusion along the circumferential direction of the electrode post.

[0009] Optionally, at least one of the first rib, the second rib, and the third rib satisfies at least one of the following conditions:

[0010] a) A groove is formed on one of the two surfaces that are opposite each other along the third direction;

[0011] b) A protruding ridge is provided on one of the two surfaces that are disposed opposite each other along the third direction;

[0012] c) One of the two surfaces arranged opposite each other along the third direction has a groove, and the other has a protruding ridge.

[0013] Optionally, the top cover has a dimension L4mm along the third direction; along the third direction, the distance between the end face of the protrusion facing away from the first surface and the first surface is L5mm, and the wall thickness of the protrusion is L6mm, then at least one of the following conditions is satisfied:

[0014] d) 1 ≤ L5 / L4 ≤ 2;

[0015] e)0.25≤L6 / L4≤0.75.

[0016] Optionally, if the top cover has a dimension L4mm along the third direction, the first rib has a dimension L7mm along the third direction, and the thickness of any one of the first segment, the second segment, and the third segment is L8mm, then at least one of the following conditions is satisfied:

[0017] f) 0.25 ≤ L7 / L4 ≤ 2;

[0018] g)0.5≤L8 / L4≤5.

[0019] Optionally, the top cover plate has a dimension L4mm along the third direction, the second rib has a dimension L9mm along the third direction, and the wall thickness of the second rib is L. 10 mm, the third rib has a dimension L along the third direction. 11 mm, the thickness of the third rib is L 12 If mm, then at least one of the following conditions must be met:

[0020] h)0.25≤L9 / L4≤2;

[0021] i) 0.5 ≤ L 10 / L4≤5;

[0022] j)0.25≤L 11 / L4≤2;

[0023] k)0.5≤L 12 / L4≤5.

[0024] Optionally, the single battery cell includes a housing, the housing having an internal cavity, and an opening communicating with the cavity on the housing, the top cover covering the opening; the top cover also has a second surface, which is disposed opposite to the first surface along the third direction, and the second surface is located inside the cavity; at least one of the following conditions is satisfied:

[0025] l) The first rib is inserted into the top cover plate, and along the third direction, one end of the first rib protrudes from the first surface, and / or the other end of the first rib protrudes from the second surface.

[0026] m) The second rib is inserted into the top cover plate. Along the third direction, one end of the second rib protrudes from the first surface, and / or the other end of the second rib protrudes from the second surface.

[0027] n) The third rib is inserted into the top cover plate. Along the third direction, one end of the third rib protrudes from the first surface, and / or the other end of the third rib protrudes from the second surface.

[0028] A second aspect of this application provides an electrical device including a single battery as described above.

[0029] In summary, this application provides a single-cell battery and an electrical device having the single-cell battery. The single-cell battery has at least one first rib on its top cover. At least one end of the first rib protrudes from the top cover along a third direction. The first rib includes at least one first segment and multiple second segments. The multiple second segments extend along a first direction and are spaced apart on both sides of the electrode post along a second direction. The ends of the multiple second segments adjacent to the explosion-proof valve along the first direction are respectively connected to the first segment. Along the second direction, the distance between the multiple second segments connected to the same first segment along the second direction is L1. Along the first direction, the value of L1 increases from the end closer to the explosion-proof valve to the end farther away from the explosion-proof valve, thereby causing the multiple second segments to extend and be arranged radially on the top cover, thus creating a radiating effect on the top cover. When the top cover plate deforms, the connection design between the first and second segments allows the first segment to block the deformation line generated by the deformation of the top cover plate. The radial structure of multiple second segments guides the deformation line generated by the deformation of the top cover plate and directs it around the terminal post, preventing the terminal post from bending due to the force generated by the deformation of the top cover plate. This controls the deformation of the top cover plate without increasing its thickness, ensuring the sealing and insulation between the top cover plate and the terminal post, ensuring the sealing of the top cover plate to the single cell casing, and ensuring the safety of the single cell. Moreover, controlling the deformation of the top cover plate without increasing its thickness can effectively reduce the space occupied by the top cover assembly in the housing cavity, improving the volume utilization rate of the single cell in three dimensions. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of a single battery cell;

[0032] Figure 2 yes Figure 1 Exploded view;

[0033] Figure 3 This is a schematic diagram of the forces acting on the top cover plate of a single cell during the initial stage of thermal runaway.

[0034] Figure 4 This is a schematic diagram of the forces acting on the top cover plate of a single cell during the middle and late stages of thermal runaway.

[0035] Figure 5 This is a top view of the top cover of a single cell in the middle to late stages of thermal runaway;

[0036] Figure 6 This is a schematic diagram of the first structure of the combination of the top cover assembly, the explosion-proof valve and the first rib in a single battery provided in the embodiments of this application;

[0037] Figure 7 This is a schematic diagram of a second structure of the combination of the top cover assembly, the explosion-proof valve and the first rib in a single battery provided in the embodiments of this application;

[0038] Figure 8 This is a schematic diagram of the third structure of the combination of the top cover assembly, the explosion-proof valve and the first rib in the single battery provided in the embodiments of this application;

[0039] Figure 9 This is a schematic diagram of the first structure of the combination of the top cover assembly, explosion-proof valve, first rib, second rib and third rib in the single battery provided in the embodiments of this application;

[0040] Figure 10 This is a schematic diagram of a second structure of the combination of the top cover assembly, explosion-proof valve, first rib, second rib, and third rib in a single battery provided in the embodiments of this application;

[0041] Figure 11 yes Figure 10 A sectional view along line AA.

[0042] Explanation of key figure labels:

[0043] 1. Single cell battery;

[0044] 10. Top cover assembly; 11. Top cover plate; 110. Deformation line; 111. First surface; 112. Second surface; 12. Terminal post; 121. Positive terminal post; 122. Negative terminal post; 13. Sealing ring; 14. Mounting hole; 15. Vent hole; 16. Liquid injection hole.

[0045] 20. Explosion-proof valve;

[0046] 30. First rib; 301. First groove; 302. First protruding ridge; 31. First segment; 310. Protrusion; 32. Second segment; 33. Third segment;

[0047] 40. Second rib position;

[0048] 50. Third reinforcement position;

[0049] 60. Fourth rib position; 61. Protrusion; 62. Bend.

[0050] 70. Shell; 701. Receiving cavity; 71. Opening; 72. Bottom wall;

[0051] 80. Electrode assembly; 81. Main body; 82. Electrode tab; 821. Positive electrode tab; 822. Negative electrode tab;

[0052] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0053] To make the objectives, technical solutions, and beneficial effects of this application clearer, the following detailed description, in conjunction with the accompanying drawings and specific embodiments, further illustrates this application. It should be understood that the specific embodiments described in this specification are merely for explaining this application and are not intended to limit it.

[0054] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0055] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0056] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0057] In the embodiments of the application, "parallel" refers to a state in which the angle formed by two lines, a line and a surface, or a surface is -1° to 1°. "Perpendicular" refers to a state in which the angle formed by two lines, a line and a surface, or a surface is 89° to 91°. Equal distances or equal angles refer to a state in which the tolerance range is -1% to 1%.

[0058] This application provides an electrical device, including a single battery cell 1. The single battery cell 1 serves as the power supply for the electrical device. The electrical device may be, 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 and satellites, energy storage systems, etc.

[0059] In some embodiments of this application, a single-cell battery 1 is provided, as shown in the reference... Figures 1 to 8 The single cell 1 has a first direction X, a second direction Y, and a third direction Z that intersect each other in pairs, as shown in the following figure. Figures 1 to 8 In the illustrated embodiment, the first direction X, the second direction Y, and the third direction Z are all pairwise orthogonal. (Refer to...) Figures 1-6 The single cell 1 includes: a top cover assembly 10, an explosion-proof valve 20, and at least one first rib 30.

[0060] Reference Figures 1-2 The top cover assembly 10 includes a top cover plate 11 and a pole post 12, as shown in the figure. Figure 11 The top cover plate 11 includes a first surface 111 and a second surface 112 disposed opposite each other along the third direction Z. The pole post 12 is inserted into the top cover plate 11. Specifically, refer to Figure 11 The top cover plate 11 has a mounting hole 14 that extends through the top cover plate 11 in a third direction Z. (Refer to...) Figure 2 The electrode post 12 includes a positive electrode post 121 and a negative electrode post 122, which are spaced apart along a first direction X. The first direction X is parallel to the length direction of the top cover plate 11, the second direction Y is parallel to the width direction of the top cover plate 11, and the third direction Z is parallel to the thickness direction of the top cover plate 11.

[0061] Reference Figures 6-10 The explosion-proof valve 20 is disposed on the first surface 111. The explosion-proof valve 20 and the pole post 12 are spaced apart along the first direction X. Specifically, refer to Figure 6 The explosion-proof valve 20 is located between the positive terminal 121 and the negative terminal 122. The top cover plate 11 has an exhaust hole 15 that runs through the top cover plate 11 in the third direction Z. The explosion-proof valve 20 is placed over the exhaust hole 15.

[0062] Reference Figure 6 A first rib 30 protrudes from at least one end along the third direction Z onto the top cover plate 11. The first rib 30 includes a first segment 31 and a plurality of second segments 32. The first segment 31 extends along the second direction Y, and the plurality of second segments 32 extend along the first direction X and are spaced apart along the second direction Y on both sides of the pole post 12. The ends of the plurality of second segments 32 adjacent to the explosion-proof valve 20 along the first direction X are respectively connected to the first segment 31. That is, along the second direction Y, the opposite ends of the first segment 31 are respectively connected to the second segment 32. (Refer to...) Figures 6-10 The number of first ribs 30 on the top cover plate 11 is two, with the positive terminal 121 corresponding to one first rib 30 and the negative terminal 122 corresponding to the other first rib 30.

[0063] Among them, reference Figure 6 Along the second direction Y, the spacing between multiple second segments 32 connected to the same first segment 31 is L1mm. Along the first direction X, the value of L1 increases from the end closer to the explosion-proof valve 20 to the end farther away from the explosion-proof valve 20. Specifically, as follows... Figures 6-10In the illustrated embodiment, there are two second segments 32 connected to the same first segment 31. Along the second direction Y, the two second segments 32 are spaced apart on both sides of the pole post 12. One end of the first segment 31 is connected to one second segment 32, and the other end is connected to the other second segment 32. The distance between the two second segments 32 is L1 mm. In other implementations, the number of second segments 32 connected to the same first segment 31 can be adjusted according to actual conditions. It is only necessary to ensure that the value of L1 between any two second segments 32 located on both sides of the same pole post 12 increases from the end closer to the explosion-proof valve 20 to the end farther from the explosion-proof valve 20.

[0064] Reference Figure 1 and Figure 2 The single-cell battery 1 also includes a housing 70 and an electrode assembly 80. The housing 70 has a receiving cavity 701 inside, and an opening 71 communicating with the receiving cavity 701 is opened at one end of the housing 70 along the third direction Z. The top cover 11 covers the opening 71 to form a seal for the receiving cavity 701. The electrode assembly 80 is disposed in the receiving cavity 701. The electrode assembly 80 includes a main body 81 and an electrode tab 82. The electrode tab 82 is disposed at one end of the main body 81 along the third direction Z adjacent to the top cover 11.

[0065] The main body 81 is formed by winding or stacking a positive electrode sheet, a separator, and a negative electrode sheet. The portions of the positive and negative electrode sheets containing active material constitute the main body 81 of the electrode assembly 80. The portions of the positive and negative electrode sheets without active material each constitute a tab 82. The tab 82 includes a positive tab 821 and a negative tab 822. The positive tab 821 is connected to the positive terminal 121, and the negative tab 822 is connected to the negative terminal 122. (Refer to...) Figure 1 and Figure 2 In the single cell 1, the top cover plate 11 in the top cover assembly 10 is usually welded to the housing 70 to form a seal on the housing 70. During the charging and discharging process of the single cell 1, the active material on the electrode plate in the electrode assembly 80 located inside the housing 70 reacts with the electrolyte and generates gas.

[0066] When a single cell 1 experiences thermal runaway due to an external impact or internal short circuit, the gas production will increase rapidly in a short period of time. The thermal runaway gas will generate high internal pressure inside the casing 70. (Refer to...) Figure 3 and Figure 4The thermal runaway gas pushes the top cover plate 11, generating an internal pressure F1 along the third direction Z (i.e., the thickness direction of the top cover plate 11) away from the housing 70. Due to the welded connection between the top cover plate 11 and the housing 70, a tensile force F2 along the third direction Z is generated at the weld between the housing 70 and the top cover plate 11, moving closer to the housing 70. In other words, the direction of the internal pressure F1 generated by the thermal runaway gas is opposite to the direction of the tensile force F2 exerted by the housing 70 on the top cover plate 11.

[0067] When a single cell 1 experiences thermal runaway, the resulting thermal runaway gas will be discharged through the vent 15, breaking through the explosion-proof valve 20. During the discharge process, the thermal runaway gas generates an internal pressure F1 in the central area of ​​the top cover plate 11 (corresponding to the area where the explosion-proof valve 20 is located) moving away from the casing 70 in a third direction Z. Figure 3 In the initial stage of thermal runaway, the internal pressure F1 causes the central region of the top cover plate 11 to bulge, as shown in the reference. Figure 4 As thermal runaway spreads, the internal pressure F1 generated by the thermal runaway gas increases, which intensifies the bulging of the central area of ​​the top cover plate 11. Correspondingly, the large surfaces of the housing 70 (i.e., the two surfaces with the largest surface area among the six surfaces of the housing 70) will also bulge as the large surfaces of the electrode assembly 80 (i.e., the two surfaces with the largest surface area among the six surfaces of the main body 81 of the electrode assembly 80) expand.

[0068] However, due to the welded connection between the housing 70 and the top cover plate 11, the moment of inertia of the edge formed at the connection between the housing 70 and the top cover plate 11 is relatively large. The tensile force F2 generated by the housing 70 on the top cover plate 11, which is opposite to the internal pressure F1, forms a resistance to the convex deformation of the top cover plate 11. (Refer to...) Figure 4 This results in the top cover plate 11 having a bulge in the central area and a concave area in the edge area connected to the housing 70, as shown in the reference. Figure 5 On the first surface 111 of the top cover plate 11, an arc-shaped "x"-shaped deformation line 110 is formed, curving from the central region of the top cover plate 11 towards the four corners of the top cover plate 11. Figure 5 It is known that the deformation line 110 will pass through the area where the terminal post 12 is located, causing the terminal post 12 to bend and be damaged, and there is a risk of seal failure at the connection between the terminal post 12 and the top cover plate 11, which affects the safety of the single cell 1.

[0069] The single-cell battery 1 provided in this application embodiment has at least one first rib 30 on the top cover plate 11. The first rib 30 includes a first segment 31 and a plurality of second segments 32. The plurality of second segments 32 extend along the first direction X and are spaced apart on both sides of the electrode post 12 along the second direction Y. The ends of the plurality of second segments 32 adjacent to the explosion-proof valve 20 along the first direction X are respectively connected to the first segment 31. Moreover, along the second direction Y, the distance between the plurality of second segments 32 connected to the same first segment 31 is L1. Along the first direction, the value of L1 increases from the end closer to the explosion-proof valve 20 to the end farther away from the explosion-proof valve 20, so that the plurality of second segments 32 in the same first rib 30 extend and are arranged radially on the top cover plate 11. That is to say, along the first direction X, one end of the second segment 32 faces the explosion-proof valve 20, and the other end of the second segment 32 faces a corner of the top cover plate 11, specifically as follows. Figures 6-10 In the illustrated embodiment, a second segment 32 is provided on each side of the same pole post 12. The two second segments 32 are arranged in a horizontal V-shape. Thus, when the top cover plate 11 deforms, the connection design between the first segment 31 and the second segment 32 allows the first segment 31 to block the deformation line 110 generated by the deformation of the top cover plate 11. The radial structure of multiple second segments 32 on both sides of the pole post 12 allows the second segments 32 to guide the deformation line 110 generated by the deformation of the top cover plate 11 and cause the deformation line to bypass the pole post 12. This design avoids the deformation line 110 caused by the deformation of the top cover plate 11 passing through the terminal post 12 and causing the terminal post 12 to bend, thereby ensuring the sealing and insulation between the top cover plate 11 and the terminal post 12, ensuring the sealing of the top cover plate 11 to the housing 70 of the single battery cell 1, and ensuring the safety of the single battery cell 1 in use. Moreover, by controlling the deformation of the top cover plate 11 without increasing its thickness, the top cover assembly 10 can effectively reduce the space occupied by the top cover assembly 10 in the housing cavity 701 of the housing 70, and improve the volume utilization rate of the single battery cell 1 in the third direction Z.

[0070] In some embodiments, the housing 70 is an aluminum housing.

[0071] In some embodiments, refer to Figures 7-10 The first rib 30 also includes a third segment 33, which extends along the second direction Y and along the first direction X. Multiple second segments 32, with their ends furthest from the explosion-proof valve 20, are connected to the third segment 33. The first segment 31, the second segment 32, and the third segment 33 surround the pole post 12 along its circumferential direction. Specifically... Figures 8-10In the embodiment shown, a second segment 32 is provided on each of the opposite sides of the pole post 12 along the second direction Y. Along the first direction X, one end of one second segment 32 is connected to the first segment 31 and the other end is connected to the third segment 33. One end of another second segment 32 is connected to the first segment 31 and the other end is connected to the third segment 33. Thus, the first segment 31, one second segment 32, the third segment 33 and the other second segment 32 are connected end to end in sequence to form a ring, so that the shape of the first rib 30 is ring-shaped and surrounds the pole post 12 along the circumferential direction of the pole post 12. The structural design of the first segment 31, the second segment 32, and the third segment 33 surrounding the terminal post 12 enables the first rib 30 to block the deformation line 110 generated by the deformation of the top cover plate 11, preventing the deformation line 110 generated by the deformation of the top cover plate 11 from passing through the terminal post 12 and causing the terminal post 12 to bend. This reduces the bending deformation of the top cover plate 11 in the area where the terminal post 12 is located, thereby ensuring the sealing and insulation between the top cover plate 11 and the terminal post 12, ensuring the sealing of the top cover plate 11 to the casing 70 of the single cell 1, and ensuring the safety of the single cell 1 in use.

[0072] In some embodiments, refer to Figure 6 and Figure 7 Along the first direction X, the first segment 31 protrudes at one end adjacent to the explosion-proof valve 20 to form a protrusion 310, as shown in the reference section. Figure 6 The protrusion 310 has a dimension L3mm along the second direction Y, and along the first direction X, the value of L3 increases from the end closer to the explosion-proof valve 20 to the end farther away from the explosion-proof valve 20. This structural design, where the dimension L3 of the protrusion 310 increases from the end closer to the explosion-proof valve 20 to the end farther away from the explosion-proof valve 20, results in a radial structure for the protrusion 310. This allows the second segment 32 to guide the deformation line 110 generated by the deformation of the top cover plate 11, thereby improving the protection effect on the pole post 12. It prevents the deformation line 110 generated by the deformation of the top cover plate 11 from passing through the pole post 12 and causing the pole post 12 to bend, reducing the bending deformation of the top cover plate 11 in the area where the pole post 12 is located. This controls the deformation of the top cover plate 11 without increasing its thickness.

[0073] In some embodiments, refer to Figure 11There is one first rib 30, which is inserted into the top cover plate 11. Along the third direction Z, one end of the first rib 30 protrudes from the first surface 111 of the top cover plate 11, and the other end protrudes from the second surface 112 of the top cover plate 11. The structural design of one end of the first rib 30 protruding from the first surface 111 of the top cover plate 11 allows the first rib 30 to block and guide the deformation line 110 formed on the first surface 111. The structural design of the other end of the first rib 30 protruding from the second surface 112 of the top cover plate 11 allows the first rib 30 to block and guide the deformation line 110 formed on the second surface 112, thereby reducing the bending deformation of the top cover plate 11 in the area where the pole post 12 is located.

[0074] In some embodiments, the number of first ribs 30 is one. The first rib 30 is inserted into the top cover plate 11. Along the third direction Z, one end of the first rib 30 protrudes from the first surface 111 of the top cover plate 11, and the other end of the first rib 30 is located inside the top cover plate 11, or the end face of the other end is flush with the second surface 112.

[0075] In some embodiments, the number of first ribs 30 is one. The first rib 30 is inserted into the top cover plate 11. Along the third direction Z, one end of the first rib 30 protrudes from the second surface 112 of the top cover plate 11; the other end of the first rib 30 is located inside the top cover plate 11, or the end face of the other end is flush with the first surface 111.

[0076] In some embodiments, there are two first ribs 30, which are respectively inserted into the top cover plate 11. Along the third direction Z, one first rib 30 protrudes from the first surface 111 of the top cover plate 11, and the other first rib 30 protrudes from the second surface 112 of the top cover plate 11.

[0077] In some embodiments, the first rib 30 and the top cover plate 11 are formed in one step by a stamping process.

[0078] In some embodiments, refer to Figure 9 and Figure 10 The single battery 1 also includes at least one second rib 40 and multiple third ribs 50. The second rib 40 protrudes from at least one end in the third direction Z and is disposed on the top cover plate 11. The second rib 40 surrounds the explosion-proof valve 20 in the circumferential direction. The third ribs 50 protrude from at least one end in the third direction Z and are disposed on the top cover plate 11. One second segment 32 corresponds to one third rib 50, specifically as follows... Figure 9 and Figure 10In the illustrated embodiment, there are two second segments 32 located on opposite sides of the same pole post 12 along the second direction Y. Therefore, there are two third ribs 50 located on the same side of the explosion-proof valve 20 along the first direction X. The third rib 50 extends along the first direction X. One end of the third rib 50 connects to the second segment 32 along the first direction X; specifically, the third rib 50 connects to the junction of the first segment 31 and the second segment 32. The other end of the third rib 50 connects to the second rib 40. (Refer to...) Figure 9 Along the second direction Y, the distance between the two third ribs 50 located on the same side of the explosion-proof valve 20 along the first direction X is L2mm. Along the first direction X, the value of L2 increases from the end closer to the explosion-proof valve 20 to the end farther away from the explosion-proof valve 20.

[0079] The second rib 40, with its structure surrounding the explosion-proof valve 20 in the circumferential direction, can protect the explosion-proof valve 20, suppressing deformation in the area where the explosion-proof valve 20 is located. It can also absorb deformation in the area surrounding the explosion-proof valve 20, reducing the bending deformation caused by the interaction of internal pressure F1 and tension F2 in the area surrounding the explosion-proof valve 20. This controls the deformation of the top cover plate 11 without increasing its thickness, ensuring the normal use and service life of the explosion-proof valve 20 and guaranteeing the safety of the single battery 1.

[0080] The structural design, in which the distance L2 between the two third ribs 50 located on the same side of the explosion-proof valve 20 along the first direction X increases from the end closer to the explosion-proof valve 20 to the end farther away from the explosion-proof valve 20, causes the two third ribs 50 to extend and be arranged radially on the top cover plate 11. That is to say, along the first direction X, one end of the third rib 50 is connected to the explosion-proof valve 20, and the other end of the third rib 50 is connected to the second segment 32. Thus, the third rib 50 and the second segment 32 cooperate to block the deformation line 110 generated by the deformation of the top cover plate 11. The radial structural design of the two deformation lines 110 makes the third ribs... 50 forms a guide for the deformation line 110 generated by the deformation of the top cover plate 11, and ensures that the deformation line 110 can bypass the terminal post 12 through the connected third rib 50 and second segment 32, so as to avoid the deformation line 110 generated by the deformation of the top cover plate 11 passing through the terminal post 12 and causing the terminal post 12 to bend, thereby reducing the bending deformation of the top cover plate 11 in the area where the terminal post 12 is located. The deformation of the top cover plate 11 is controlled without increasing the thickness of the top cover plate 11, thereby ensuring the sealing and insulation between the top cover plate 11 and the terminal post 12, ensuring the sealing of the top cover plate 11 to the casing 70 of the single cell 1, and ensuring the safety of the single cell 1 in use.

[0081] In some embodiments, refer to Figure 11The single cell 1 also includes a fourth rib 60, which includes a protrusion 61 and a bend 62. The protrusion 61 protrudes along the third direction Z and is disposed on the first surface 111. The protrusion 61 surrounds the electrode post 12 in the circumferential direction. Along the third direction Z, the end of the protrusion 61 away from the first surface 111 bends towards the electrode post 12 to form the bend 62. (Refer to...) Figure 11 The first rib 30 surrounds the protrusion 61 along the circumferential direction of the pole post 12. (Refer to...) Figures 6 to 11 A sealing ring 13 is provided on the terminal post 12. The sealing ring 13 surrounds the terminal post 12 in the circumferential direction. A fourth rib 60 is embedded in the sealing ring 13. The sealing ring 13 surrounds and covers the fourth rib 60 in the circumferential direction. The setting of the fourth rib 60 directly suppresses the deformation of the top cover plate 11, reduces the bending deformation of the top cover plate 11 in the area where the terminal post 12 is located, controls the deformation of the top cover plate 11 without increasing the thickness of the top cover plate 11, and at the same time plays a role in fixing the terminal post 12, ensuring the sealing and insulation between the top cover plate 11 and the terminal post 12, ensuring the sealing of the top cover plate 11 to the casing 70 of the single cell 1, and ensuring the safety of the single cell 1 in use.

[0082] In some embodiments, refer to Figure 11 Along the third direction Z, a first groove 301 is formed on one surface of the first rib 30. Specifically, the first groove 301 is formed on the side of the first rib 30 away from the housing 70 along the third direction Z, and the first groove 301 surrounds the pole post 12 in the circumferential direction. The opening of the first groove 301 allows the first rib 30 to buffer the deformation of the top cover plate 11, guide the deformation line 110 initiated from the central region of the top cover plate 11 to bypass the region where the pole post 12 is located, thereby reducing the bending deformation of the top cover plate 11 in the region where the pole post 12 is located, and ensuring the sealing and insulation between the top cover plate 11 and the pole post 12.

[0083] In some embodiments, refer to Figure 11 Along the third direction Z, a first ridge 302 is provided protruding from one surface of the first rib 30. Specifically, the first rib 30 has the first ridge 302 protruding from the side of the first rib 30 facing the housing 70 along the third direction Z, and the first ridge 302 surrounds the pole post 12 in the circumferential direction. The provision of the first ridge 302 makes the first rib 30, together with the fourth rib 60, work together to suppress the deformation of the area where the pole post 12 is located, ensuring the sealing and insulation between the top cover plate 11 and the pole post 12.

[0084] In some embodiments, refer to Figure 11Along the third direction Z, a first groove 301 is formed on one surface of the first rib 30, and a first ridge 302 is formed on the other surface. Specifically, the first groove 301 is formed on the side of the first rib 30 away from the housing 70, and the first ridge 302 is formed on the side facing the housing 70. This allows the first rib 30 to work with the fourth rib 60 to suppress the deformation of the area where the pole post 12 is located, thus ensuring the sealing and insulation between the top cover plate 11 and the pole post 12.

[0085] In some embodiments, a second groove (not shown in the figure) is formed on one surface of the second rib 40 along the third direction Z. Specifically, the second groove is formed on the side of the second rib 40 away from the housing 70 along the third direction Z, and the second groove surrounds the explosion-proof valve 20 in the circumferential direction. The second groove buffers the deformation of the top cover plate 11 caused by the second rib 40, absorbs the deformation caused by welding deformation of the explosion-proof valve 20 or the deformation caused by the force on the top cover plate 11, thereby reducing the bending deformation of the top cover plate 11 in the area where the explosion-proof valve 20 is located, and ensuring the safety of the explosion-proof valve 20 in use.

[0086] In some embodiments, a second ridge (not shown in the figure) protrudes from one surface of the second rib 40 along the third direction Z. Specifically, the second rib 40 has a second ridge protruding from the side facing the housing 70 along the third direction Z, and the second ridge surrounds the explosion-proof valve 20 in the circumferential direction. The provision of the second ridge allows the second rib 40 to directly suppress deformation in the area where the explosion-proof valve 20 is located, acting as a reinforcing rib.

[0087] In some embodiments, along the third direction Z, a second groove (not shown in the figure) is provided on one surface of the second rib 40, and a second ridge (not shown in the figure) is provided on the other surface. Specifically, the second groove is provided on the side of the second rib 40 away from the housing 70, and the second ridge is provided on the side facing the housing 70, so that the second rib 40 directly suppresses the deformation of the area where the explosion-proof valve 20 is located as a reinforcing rib.

[0088] In some embodiments, a third groove (not shown in the figure) is formed on one surface of the third rib 50 along the third direction Z. Specifically, the third groove is formed on the side of the third rib 50 away from the housing 70 along the third direction Z, and the third groove extends along the length direction of the third rib 50. The third groove buffers the deformation of the top cover plate 11 caused by the third rib 50, guides the deformation line 110 originating from the central region of the top cover plate 11 to bypass the region where the pole post 12 is located, thereby reducing the bending deformation of the top cover plate 11 in the region where the pole post 12 is located, and ensuring the sealing and insulation between the top cover plate 11 and the pole post 12.

[0089] In some embodiments, a third ridge (not shown in the figure) protrudes from one surface of the third rib 50 along the third direction Z. Specifically, the third rib 50 has a third ridge protruding from the side facing the housing 70 along the third direction Z, and the third ridge extends along the length of the third rib 50. The provision of the third ridge allows the third rib 50 to directly suppress deformation in the area where the explosion-proof valve 20 is located, acting as a reinforcing rib.

[0090] In some embodiments, along the third direction Z, a third groove (not shown in the figure) is provided on one surface of the third rib 50, and a third ridge (not shown in the figure) is provided on the other surface. Specifically, the third groove is provided on the side of the third rib 50 away from the housing 70, and the third ridge is provided on the side facing the housing 70, so that the third rib 50 directly suppresses the deformation of the area where the explosion-proof valve 20 is located as a reinforcing rib.

[0091] In some embodiments, there is one second rib 40, which is inserted into the top cover plate 11. Along the third direction Z, one end of the second rib 40 protrudes from the first surface of the top cover plate 11, and the other end protrudes from the second surface of the top cover plate 11. The design of one end of the second rib 40 protruding from the first surface 111 of the top cover plate 11 allows the second rib 40 to block and guide the deformation line 110 formed on the first surface 111. The design of the other end of the second rib 40 protruding from the second surface 112 of the top cover plate 11 allows the second rib 40 to block and guide the deformation line 110 formed on the second surface 112, thereby reducing the bending deformation of the top cover plate 11 in the area where the explosion-proof valve 20 is located.

[0092] In some embodiments, there is one second rib 40. The second rib 40 is inserted into the top cover plate 11. Along the third direction Z, one end of the second rib 40 protrudes from the first surface of the top cover plate 11, and the other end protrudes from the second surface of the top cover plate 11. The structural design of the second rib 40 inserted into the top cover plate 11 allows the second rib 40 to block and guide the deformation line 110 formed on the first surface 111, and also allows the second rib 40 to block and guide the deformation line 110 formed on the second surface 112, thereby reducing the bending deformation of the top cover plate 11 in the area where the pole post 12 is located.

[0093] In some embodiments, the number of second ribs 40 is one. The second rib 40 is inserted into the top cover plate 11. Along the third direction Z, one end of the second rib 40 protrudes from the first surface 111 of the top cover plate 11, and the other end of the second rib 40 is located inside the top cover plate 11, or the end face of the other end is flush with the second surface 112.

[0094] In some embodiments, the number of second ribs 40 is one. The second rib 40 is inserted into the top cover plate 11. Along the third direction Z, one end of the second rib 40 protrudes from the second surface 112 of the top cover plate 11; the other end of the second rib 40 is located inside the top cover plate 11, or the end face of the other end is flush with the first surface 111.

[0095] In some embodiments, there are two second ribs 40, which are respectively inserted into the top cover plate 11. Along the third direction Z, one second rib 40 protrudes from the first surface 111 of the top cover plate 11, and the other second rib 40 protrudes from the second surface 112 of the top cover plate 11. In some embodiments, the second ribs 40 and the top cover plate 11 are formed in one step by stamping.

[0096] In some embodiments, the number of third ribs 50 is one. The third rib 50 is inserted into the top cover plate 11. Along the third direction Z, one end of the third rib 50 protrudes from the first surface 111 of the top cover plate 11, and the other end protrudes from the second surface 112 of the top cover plate 11. The structural design of one end of the third rib 50 protruding from the first surface 111 of the top cover plate 11 allows the third rib 50 to block and guide the deformation line 110 formed on the first surface 111. The structural design of the other end of the third rib 50 protruding from the second surface 112 of the top cover plate 11 allows the third rib 50 to block and guide the deformation line 110 formed on the second surface 112, thereby reducing the bending deformation of the top cover plate 11 in the area where the pole post 12 is located.

[0097] In some embodiments, the number of third ribs 50 is one. The third rib 50 is inserted into the top cover plate 11. Along the third direction Z, one end of the third rib 50 protrudes from the first surface 111 of the top cover plate 11, and the other end of the third rib 50 is located inside the top cover plate 11, or the end face of the other end is flush with the second surface 112.

[0098] In some embodiments, the number of third ribs 50 is one. The third rib 50 is inserted into the top cover plate 11. Along the third direction Z, one end of the third rib 50 protrudes from the second surface 112 of the top cover plate 11; the other end of the third rib 50 is located inside the top cover plate 11, or the end face of the other end is flush with the first surface 111.

[0099] In some embodiments, there are two third ribs 50, which are respectively inserted into the top cover plate 11. Along the third direction Z, one third rib 50 protrudes from the first surface 111 of the top cover plate 11, and the other third rib 50 protrudes from the second surface 112 of the top cover plate 11.

[0100] In some embodiments, the third rib 50 and the top cover plate 11 are formed in one step by a stamping process.

[0101] In some embodiments, refer to Figure 11 The top cover plate 11 has a dimension L4mm along the third direction Z. Along the third direction Z, the distance between the end face of the protrusion 61 of the fourth rib 60 away from the first surface 111 and the first surface 111 is L5mm, satisfying: 1≤L5 / L4≤2. Specifically, the value of L5 / L4 can be any value among 1, 1.3, 1.5, 1.8, and 2, or any value within a range of any two values. When the value of L5 / L4 is within the above range, the fourth rib 60 can effectively reduce the bending deformation of the top cover plate 11 in the area where the electrode post 12 is located, and can reduce the space occupied by the protrusion 61 in the fourth rib 60 in the receiving cavity 701 of the housing 70, thereby improving the volume utilization rate of the single battery 1 in the third direction Z.

[0102] In some embodiments, refer to Figure 11 The wall thickness of the protrusion 61 of the fourth rib 60 is L6mm, satisfying: 0.25≤L6 / L4≤0.75. Specifically, the value of L6 / L4 can be any value among 0.25, 0.35, 0.50, 0.60, and 0.75, or any value within a range of any two values. When the value of L6 / L4 is within the above range, the fourth rib 60 can effectively reduce the bending deformation of the top cover plate 11 in the area where the pole post 12 is located, ensuring the sealing between the pole post 12 and the top cover plate 11.

[0103] In some embodiments, refer to Figure 11 The first rib 30 has a dimension L7mm along the third direction Z, satisfying: 0.25≤L7 / L4≤2. Specifically, the value of L7 / L4 can be any value from 0.25, 0.5, 1, 1.25, 1.5, 1.75, 2, or any value within a range of any two values. When the value of L7 / L4 is within the above range, the first rib 30 can effectively reduce the bending deformation of the top cover 11 in the area where the electrode post 12 is located, and can reduce the space occupied by the first rib 30 in the receiving cavity 701 of the housing 70, thereby improving the volume utilization rate of the single battery cell 1 in the third direction Z. Here, L7 is the distance between two opposite surfaces of the first rib 30 along the third direction Z.

[0104] In some embodiments, refer to Figure 8The thickness of any one of the first segment 31, the second segment 32, and the third segment 33 in the first rib 30 is L8mm, satisfying: 0.5≤L8 / L4≤5. Specifically, the value of L8 / L4 can be any value from 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, or any value within a range of any two values. When the value of L8 / L4 is within the above range, the first rib 30 can effectively reduce the bending deformation of the top cover plate 11 in the area where the pole post 12 is located, ensuring the sealing between the pole post 12 and the top cover plate 11. The wall thickness of the first rib 30 can be as follows: Figures 8-10 The thickness of the first segment 31 in the illustrated embodiment can be as follows: Figures 6-10 The thickness of any of the second segments 32 in the illustrated embodiment can also be as follows: Figures 7-10 The thickness of the third segment 33 in the illustrated embodiment.

[0105] In some embodiments, the second rib 40 has a dimension L9 mm along the third direction Z, satisfying: 0.25 ≤ L9 / L4 ≤ 2. Specifically, the value of L9 / L4 can be any value from 0.25, 0.5, 1, 1.25, 1.5, 1.75, 2, or any value within a range of any two values. When the value of L9 / L4 is within the above range, the second rib 40 can effectively reduce the bending deformation of the top cover plate 11 in the area where the explosion-proof valve 20 is located, and can reduce the space occupied by the second rib 40 in the receiving cavity 701 of the housing 70, thereby improving the volume utilization rate of the single battery 1 in the third direction Z. Here, L9 is the distance between two opposite surfaces of the second rib 40 along the third direction Z.

[0106] In some embodiments, refer to Figure 9 The wall thickness of the second rib position 40 is L. 10 mm, satisfying: 0.5≤L 10 / L4≤5, specifically, L 10 The value of / L4 can be any value from 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, or any value within a range of any two values. When L 10 When the value of / L4 is within the above range, the second rib 40 can effectively reduce the bending deformation of the top cover plate 11 in the area where the explosion-proof valve 20 is located.

[0107] In some embodiments, the third rib 50 has a dimension L along the third direction Z. 11 mm, satisfying: 0.25≤L 11 / L4≤2, specifically, L 11 The value of / L4 can be any value from 0.25, 0.5, 1, 1.25, 1.5, 1.75, 2, or any value within a range of any two values. When L11 When the value of / L4 is within the above range, the third rib 50 can effectively reduce the bending deformation of the top cover plate 11 in the area where the electrode post 12 is located, and can reduce the space occupied by the third rib 50 in the receiving cavity 701 of the housing 70, thereby improving the volume utilization rate of the single cell 1 in the third direction Z. Among them, L 11 The distance between the two opposite faces of the third rib 50 along the third direction Z is denoted as Z.

[0108] In some embodiments, refer to Figure 9 The wall thickness of the third rib (position 50) is L. 12 mm, satisfying: 0.5≤L 12 / L4≤5, specifically, L 12 The value of / L4 can be any value from 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, or any value within a range of any two values. When L 12 When the value of / L4 is within the above range, the third rib 50 can effectively reduce the bending deformation of the top cover plate 11 in the area where the pole post 12 is located, and ensure the sealing between the pole post 12 and the top cover plate 11.

[0109] The present application will be further described in detail below with reference to specific embodiments, which should not be construed as limiting the scope of protection claimed in the present application.

[0110] Example 1

[0111] Assemble single cell 1:

[0112] Through a stamping process, a first rib 30, a second rib 40, a third rib 50, and a fourth rib 60 are formed on the top cover plate 11. Along the third direction Z, one end of the first rib 30 protrudes from the first surface 111 of the top cover plate 11, and the other end protrudes from the second surface 112 of the top cover plate 11; one end of the second rib 40 protrudes from the first surface 111 of the top cover plate 11, and the other end protrudes from the second surface 112 of the top cover plate 11; one end of the third rib 50 protrudes from the first surface 111 of the top cover plate 11, and the other end protrudes from the second surface 112 of the top cover plate 11.

[0113] Among them, the ratio of the distance L5 between the end face of the protrusion 61 of the fourth rib 60 away from the first surface 111 and the first surface 111 to the dimension L4 of the top cover plate 11 along the third direction Z is L5 / L4; the ratio of the wall thickness L6 of the protrusion 61 to L4 is L6 / L4; the ratio of the dimension L7 of the first rib 30 along the third direction Z to L4 is L7 / L4; the ratio of the wall thickness L8 of the first rib 30 to L4 is L8 / L4; the ratio of the dimension L9 of the second rib 40 along the third direction Z to L4 is L9 / L4; and the ratio of the wall thickness L of the second rib 40 is L... 10The ratio L between L4 and L4 10 / L4, the third rib position 50 along the third direction Z dimension L 11 The ratio L between L4 and L4 11 / L4, and the wall thickness L of the third rib 50 12 The ratio L between L4 and L4 12 / L4 are shown in Table 1.

[0114] Insert the pole 12 into the mounting hole 14 of the top cover plate 11, and cover the explosion-proof valve 20 onto the exhaust hole 15.

[0115] The electrode assembly 80 is installed into the receiving cavity 701 of the housing 70, and the top cover 11 is closed onto the opening 71 of the housing 70.

[0116] Examples 2-40

[0117] The secondary battery 1 is assembled using the method described in Example 1, except for the following differences:

[0118] During the stamping process, adjust the ratio between L5 and L4 (L5 / L4), the ratio between L6 and L4 (L6 / L4), the ratio between L7 and L4 (L7 / L4), the ratio between L8 and L4 (L8 / L4), and the ratio between L9 and L4 (L9 / L4). 10 The ratio L between L4 and L4 10 / L4, adjust L 11 The ratio L between L4 and L4 11 / L4, adjust L 12 The ratio L between L4 and L4 12 / L4, see Table 1 for details.

[0119] In the single cell 1 provided in Examples 1 to 40, the dimension L4 of the top cover plate 11 along the third direction Z remains unchanged and is the same value.

[0120] Size measurement:

[0121] Dimensioning tools such as a spacing measuring instrument and vernier calipers can be used to measure L4 to L 12 Take measurements.

[0122] Method for measuring the internal height H1 of a single cell:

[0123] Reference Figure 2 The internal height H1 of a single cell is equivalent to the distance between the end face of the tab 82 of the electrode assembly 80 facing away from the main body 81 along the third direction Z and the end face of the main body 81 facing away from the tab 82 along the third direction Z.

[0124] Reference Figure 1Measure the height Hmm between the first surface 111 of the top cover plate 11 and the bottom wall 72 of the housing 70 along the third direction Z. Measure the dimensions L5 of the protrusion 61, L7 of the first rib 30 along the third direction Z, L9 of the second rib 40 along the third direction Z, and L1 of the third rib 50 along the third direction Z. 11 Using the subtraction method, in Examples 1-5, the difference between H and L5 is used to obtain the internal height H1 of a single cell. In Examples 11-15, the difference between H and L7 is used to obtain the internal height H1 of a single cell. In Examples 21-25, the difference between H and L9 is used to obtain the internal height H1 of a single cell. In Examples 31-35, the difference between H and L9 is used to obtain the internal height H1 of a single cell.

[0125] In this case, the difference H1 between H and L5 in Example 1 is used as the reference value. The values ​​of H1 obtained in Examples 2-5, 11-15, 21-25 and 31-35 are compared with the value of H1 obtained in Example 1. That is, the change ratio of the internal height H1 of the single cell 1 provided in Examples 2-5, 11-15, 21-25 and 31-35 to the internal height H1 of the single cell 1 provided in Example 1 is obtained, as shown in Table 1.

[0126] Method for measuring the height change of terminal post 12 after thermal runaway of single cell 1:

[0127] Take a normal single cell 1, refer to Figure 1 The distance between the end face of the pole post 12 away from the top cover plate 11 along the third direction Z and the end face of the housing 70 with the opening 71 is defined as h0mm.

[0128] After thermal runaway, the distance between the end face of the terminal post 12 away from the top cover plate 11 along the third direction Z and the end face of the housing 70 with the opening 71 is measured and defined as h1mm.

[0129] After thermal runaway of cell 1, the height change of the terminal post 12 along the third direction Z is Δhmm, which satisfies: Δh=h1-h0.

[0130] In this case, the height change Δh of the terminal post 12 of the single cell 1 provided in Example 1 is used as the reference value. The height change Δh of the terminal post 12 of the single cell 1 provided in Examples 2 to 39 is compared with the height change Δh of the terminal post 12 of the single cell 1 provided in Example 1. The change ratio of the height change Δh of the terminal post 12 of the single cell 1 provided in Examples 2 to 39 to the height change Δh of the terminal post 12 of the single cell 1 provided in Example 1 is obtained, as shown in Table 1.

[0131] Table 1

[0132]

[0133]

[0134]

[0135]

[0136] As shown in Table 1, referring to Examples 1-5, the ratio L5 / L4 between the size L5 of the protrusion 61 of the fourth rib 60 and the size L4 of the top cover plate 11 in Examples 2-4 shows an increasing trend compared to Example 1. This indicates that the size L5 of the protrusion 61 of the fourth rib 60 in the third direction Z of the single battery 1 provided in Examples 2-5 shows an increasing trend, and the space occupied by the protrusion 61 inside the receiving cavity 701 shows an increasing trend. As a result, the internal height H1 of the single battery 1 provided in Examples 2-5 shows a decreasing trend compared to Example 1, and the height occupied by the electrode assembly 80 of the single battery 1 provided in Examples 2-5 inside the receiving cavity 701 shows a decreasing trend. The volume utilization rate of the single battery 1 in the third direction Z shows a decreasing trend.

[0137] Referring to Examples 1 to 5, since the size L5 of the protrusion 61 in the third direction Z of Examples 2 to 5 tends to increase, the effect of the fourth rib 60 in suppressing the bending deformation of the top cover 11 in the area where the electrode post 12 is located is enhanced, thereby making the change in height of the electrode post 12 of the single cell 1 provided in Examples 2 to 5 decrease after thermal runaway compared with Example 1.

[0138] Referring to Examples 6-10, the ratio L6 / L4 between the wall thickness L6 and L4 of the fourth rib 60 in Examples 6-10 shows an increasing trend, indicating that the wall thickness L6 of the fourth rib 60 shows an increasing trend. However, the size L5 of the protrusion 61 of the fourth rib 60 remains unchanged and is the same as in Example 1. Therefore, the internal height H1 of the single cell 1 remains unchanged compared with Example 1. However, the wall thickness L6 of the fourth rib 60 of the single cell 1 provided in Examples 6-10 shows an increasing trend, which enhances the effect of the fourth rib 60 in suppressing the bending deformation of the top cover 11 in the area where the electrode post 12 is located. As a result, the change in height of the electrode post 12 of the single cell 1 provided in Examples 6-10 after thermal runaway shows a decreasing trend compared with Example 1.

[0139] Referring to Examples 11-15, the ratio L7 / L4 between the dimensions L7 and L4 of the first rib 30 along the third direction Z in Examples 12-15 shows an increasing trend compared to Example 1. This indicates that the dimension L7 of the first rib 30 along the third direction Z in the single cell 1 provided in Examples 12-15 shows an increasing trend, and the space occupied by the first rib 30 inside the receiving cavity 701 shows an increasing trend. Consequently, the internal height H1 of the single cell 1 provided in Examples 12-15 shows a decreasing trend compared to Example 1, resulting in a decreasing trend in the height occupied by the electrode assembly 80 of the single cell 1 provided in Examples 12-15 within the receiving cavity 701, and a decreasing trend in the volume utilization rate of the single cell 1 in the third direction Z. Among them, the dimension L7 of the first rib 30 along the third direction Z in the single cell 1 provided in Example 11 is the same as that in Example 1, therefore the internal height H1 of the single cell 1 remains unchanged compared to Example 1.

[0140] Referring to Examples 11-15, since the dimension L7 of the first rib 30 in the third direction Z of Examples 12-15 shows an increasing trend, the effect of the first rib 30 in suppressing the bending deformation of the top cover plate 11 in the region where the electrode post 12 is located is enhanced. Therefore, the height change of the electrode post 12 after thermal runaway of the single cell 1 provided in Examples 12-15 shows a decreasing trend compared to Example 1. Specifically, the dimension L7 of the first rib 30 in the third direction Z of the single cell 1 provided in Example 11 is the same as that in Example 1; therefore, the height change of the electrode post 12 after thermal runaway of the single cell 1 remains unchanged compared to Example 1.

[0141] Referring to Examples 16-20, the ratio L8 / L4 between the wall thickness L8 and L4 of the first rib 30 in Examples 16-20 shows an increasing trend, indicating that the wall thickness L8 of the first rib 30 shows an increasing trend. However, the size L7 of the first rib 30 remains unchanged and is the same as in Example 1. Therefore, the internal height H1 of the single cell 1 remains unchanged compared with Example 1. However, the wall thickness L8 of the first rib 30 of the single cell 1 provided in Examples 16-20 shows an increasing trend, which enhances the effect of the first rib 30 in suppressing the bending deformation of the top cover 11 in the area where the electrode post 12 is located. As a result, the change in height of the electrode post 12 after thermal runaway in the single cell 1 provided in Examples 16-20 shows a decreasing trend compared with Example 1.

[0142] Referring to Examples 21-25, the ratio L9 / L4 between the dimensions L9 and L4 of the second rib 40 along the third direction Z in Examples 22-25 shows an increasing trend compared to Example 1. This indicates that the dimension L9 of the second rib 40 along the third direction Z in the single cell 1 provided in Examples 22-25 shows an increasing trend, and the space occupied by the second rib 40 inside the receiving cavity 701 shows an increasing trend. Consequently, the internal height H1 of the single cell 1 provided in Examples 22-25 shows a decreasing trend compared to Example 1, resulting in a decreasing trend in the height occupied by the electrode assembly 80 within the receiving cavity 701 of the single cell 1 provided in Examples 22-25, and a decreasing trend in the volume utilization rate of the single cell 1 along the third direction Z. Among them, the dimension L9 of the second rib 40 along the third direction Z in the single cell 1 provided in Example 21 is the same as that in Example 1, therefore the internal height H1 of the single cell 1 remains unchanged compared to Example 1.

[0143] Referring to Examples 21-25, since the dimension L9 of the second rib 40 along the third direction Z in Examples 22-25 increases, the effect of the second rib 40 in suppressing the bending deformation of the top cover plate 11 in the area where the explosion-proof valve 20 is located is enhanced. Therefore, the height change of the terminal post 12 of the single cell 1 provided in Examples 22-25 after thermal runaway is lower than that in Example 1. Specifically, the dimension L9 of the second rib 40 along the third direction Z of the single cell 1 provided in Example 21 is the same as that in Example 1; therefore, the height change of the terminal post 12 of the single cell 1 after thermal runaway remains unchanged compared to Example 1.

[0144] Referring to Examples 26-30, the wall thickness L of the second rib 40 in Examples 26-30 10 The ratio L between L4 and L4 10 The increasing trend of / L4 indicates that the wall thickness L of the second rib 40 is increasing. 10 The trend shows an increasing trend, but the dimension L9 of the second rib 40 along the third direction Z remains unchanged and is the same as in Embodiment 1. Therefore, the internal height H1 of the single cell 1 remains unchanged compared with Embodiment 1. However, the wall thickness L of the second rib 40 of the single cell 1 provided in Embodiments 26-30 is... 10 The increasing trend enhances the effect of the second rib 40 in suppressing the bending deformation of the top cover plate 11 in the area where the explosion-proof valve 20 is located, thereby making the change in height of the electrode post 12 of the single cell 1 provided in Examples 26-30 after thermal runaway decrease compared with Example 1.

[0145] Referring to Examples 31-35, the dimension L of the third rib 50 along the third direction Z in Examples 32-35 is... 11 The ratio L between L4 and L4 11 / L4 shows an increasing trend compared to Example 1, indicating that the size L of the third rib 50 in the single cell 1 provided in Examples 32-35 along the third direction Z is increasing. 11 The space occupied by the third rib 50 within the receiving cavity 701 increases, resulting in a decrease in the internal height H1 of the single cell 1 provided in Embodiments 32-35 compared to Embodiment 1. Consequently, the height occupied by the electrode assembly 80 within the receiving cavity 701 of the single cell 1 provided in Embodiments 32-35 decreases, and the volume utilization rate of the single cell 1 in the third direction Z decreases. Specifically, the dimension L of the third rib 50 of the single cell 1 provided in Embodiment 31 along the third direction Z... 11 As in Example 1, the internal height H1 of the single cell 1 remains unchanged compared to Example 1.

[0146] Referring to Examples 31-35, since the third rib 50 in Examples 32-35 has a dimension L along the third direction Z... 11 The increasing trend enhances the effect of the third rib 50 in suppressing the bending deformation of the top cover 11 in the region where the electrode post 12 is located, thereby reducing the change in height of the electrode post 12 after thermal runaway in the single cell 1 provided in Examples 32-35 compared to Example 1. Specifically, the dimension L of the third rib 50 of the single cell 1 provided in Example 31 along the third direction Z... 11 As in Example 1, the change in height of the terminal post 12 after thermal runaway of the single cell 1 remains unchanged compared to Example 1.

[0147] Referring to Examples 36-40, the wall thickness L of the third rib 50 in Examples 36-40 12 The ratio L between L4 and L4 12 The increasing trend of / L4 indicates that the wall thickness L of the third rib position 50 is increasing. 12 The trend is increasing, but the dimension L of the third rib 50 along the third direction Z is... 11 The internal height H1 of the single cell 1 remains unchanged and is the same as in Example 1. However, the wall thickness L of the third rib 50 of the single cell 1 provided in Examples 36-40 remains unchanged. 12 The increasing trend enhances the effect of the third rib 50 in suppressing the bending deformation of the top cover 11 in the area where the electrode post 12 is located, thereby making the change in height of the electrode post 12 of the single cell 1 provided in Examples 36-40 decrease after thermal runaway compared with Example 1.

[0148] The technical solutions provided by the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A single-cell battery, said single-cell battery having two perpendicular directions: a first direction, a second direction, and a third direction, characterized in that, The single battery cell includes: A top cover assembly includes a top cover plate and an electrode post, the electrode post being inserted into the top cover plate, the top cover plate having a first surface intersecting the third direction; An explosion-proof valve is disposed on the first surface, and the explosion-proof valve and the pole are spaced apart along the first direction; At least one first rib is provided on the top cover plate, the first rib protruding from at least one end along the third direction. The first rib includes a first segment and a plurality of second segments. The first segment extends along the second direction. The plurality of second segments extend along the first direction and are spaced apart on both sides of the pole post along the second direction. The ends of the plurality of second segments adjacent to the explosion-proof valve along the first direction are respectively connected to the first segment. Along the second direction, the spacing between the plurality of second segments connected to the same first segment is L1 mm, and along the first direction, the value of L1 increases from the end closer to the explosion-proof valve to the end farther away from the explosion-proof valve.

2. The single-cell battery as described in claim 1, characterized in that, The single cell also includes at least one second rib and multiple third ribs; The second rib protrudes from at least one end along the third direction and is disposed on the top cover plate; the second rib surrounds the explosion-proof valve along the circumferential direction of the explosion-proof valve. The third rib protrudes from at least one end along the third direction and is disposed on the top cover plate. One second segment corresponds to one third rib. The third rib extends along the first direction. Along the first direction, one end of the third rib is connected to the second segment and the other end is connected to the second rib. Along the second direction, the distance between the two third ribs located on the same side of the explosion-proof valve along the first direction is L2mm. Along the first direction, the value of L2 increases from the end closer to the explosion-proof valve to the end farther away from the explosion-proof valve.

3. The single-cell battery as described in claim 1, characterized in that, The first rib also includes at least one third segment, which extends along the second direction. Along the first direction, the ends of the plurality of second segments away from the explosion-proof valve are respectively connected to the third segment. The first segment, the second segment, and the third segment surround the pole post along the circumferential direction of the pole post.

4. The single-cell battery as described in claim 1, characterized in that, Along the first direction, the first segment protrudes at one end adjacent to the explosion-proof valve to form a protrusion, the protrusion having a dimension L3mm along the second direction, and along the first direction, the value of L3 increases from the end closer to the explosion-proof valve to the end farther away from the explosion-proof valve.

5. The single-cell battery as described in claim 1, characterized in that, The single cell also includes a fourth rib, which includes a protrusion and a bend. The protrusion protrudes along the third direction on the first surface, and the protrusion surrounds the pole post in the circumferential direction. Along the third direction, the end of the protrusion facing away from the first surface is bent toward the pole post to form the bent portion; The first rib surrounds the protrusion along the circumferential direction of the pole post.

6. The single-cell battery as described in claim 2, characterized in that, At least one of the first rib, the second rib, and the third rib satisfies at least one of the following conditions: a) A groove is formed on one of the two surfaces that are opposite each other along the third direction; b) A protruding ridge is provided on one of the two surfaces that are disposed opposite each other along the third direction; c) One of the two surfaces arranged opposite each other along the third direction has a groove, and the other has a protruding ridge.

7. The single-cell battery as described in claim 5, characterized in that, The top cover has a dimension L4mm along the third direction; Along the third direction, if the distance between the end face of the protrusion facing away from the first surface and the first surface is L5mm, and the wall thickness of the protrusion is L6mm, then at least one of the following conditions is satisfied: d) 1 ≤ L5 / L4 ≤ 2; e)0.25≤L6 / L4≤0.

75.

8. The single-cell battery as described in claim 3, characterized in that, The top cover has a dimension L4mm along the third direction, the first rib has a dimension L7mm along the third direction, and the thickness of any one of the first segment, the second segment, and the third segment is L8mm, then at least one of the following conditions is satisfied: f) 0.25 ≤ L7 / L4 ≤ 2; g)0.5≤L8 / L4≤5.

9. The single-cell battery as described in claim 2, characterized in that, The top cover plate has a dimension L4mm along the third direction, the second rib has a dimension L9mm along the third direction, and the wall thickness of the second rib is L. 10 mm, the third rib has a dimension L along the third direction. 11 mm, the thickness of the third rib is L 12 If mm, then at least one of the following conditions must be met: h)0.25≤L9 / L4≤2; i)0.5≤L 10 / L4≤5; j)0.25≤L 11 / L4≤2; k)0.5≤L 12 / L4≤5。 10. The single-cell battery as described in claim 2, characterized in that, The single battery cell includes a housing, an internal cavity, and an opening communicating with the cavity. The top cover covers the opening. The top cover also has a second surface, which is disposed opposite to the first surface along the third direction, and the second surface is located inside the receiving cavity; At least one of the following conditions must be met: l) The first rib is inserted into the top cover plate, and along the third direction, one end of the first rib protrudes from the first surface, and / or the other end of the first rib protrudes from the second surface. m) The second rib is inserted into the top cover plate. Along the third direction, one end of the second rib protrudes from the first surface, and / or the other end of the second rib protrudes from the second surface. n) The third rib is inserted into the top cover plate. Along the third direction, one end of the third rib protrudes from the first surface, and / or the other end of the third rib protrudes from the second surface.

11. An electrical appliance, characterized in that, Includes the single-cell battery as described in any one of claims 1 to 10.

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