Battery and battery pack

Abstract

The invention provides a battery and a battery pack. The battery comprises a shell, a cover plate assembly and a first sealing piece, a first opening is formed in one end of the shell, the cover plate assembly is connected with the shell and seals the first opening, the first sealing piece is arranged between the cover plate assembly and the shell, and the first sealing piece bypasses the side edge face of the cover plate assembly and is in sealing connection with the cover plate assembly and the shell; a gap is formed between the first sealing piece and the side edge face of the cover plate assembly. According to the battery, the gap is reserved between the first sealing element and the side edge surface of the cover plate assembly, so that the first sealing element cannot extrude the side edge surface of the cover plate assembly in the buckling process of the cover plate assembly and the shell, the risk of deformation of the cover plate assembly is reduced, and the overall structural stability and use performance of the battery are ensured.

Description

Technical Field

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

[0002] With the development of battery technology, the requirements for battery safety performance are getting higher and higher, and battery sealing is crucial to battery safety performance. Among them, battery sealing mainly includes the sealing of the battery shell and the cover assembly. In the related technology, welding sealing or snap-fit ​​sealing is mostly used. When snap-fit ​​sealing is used, a seal is set between the shell and the cover assembly, and the seal of the shell and the cover assembly is achieved by squeezing the seal. However, when snap-fit ​​sealing is used in the related technology, the cover assembly may deform and collapse, resulting in poor structural stability of the battery as a whole. Summary of the invention

[0003] The embodiments of the present application provide a battery and a battery pack, which can improve the problem of poor structural stability of the overall battery.

[0004] In a first aspect, an embodiment of the present application provides a battery, comprising:

[0005] A housing, wherein a first opening is formed at one end of the housing;

[0006] a cover plate assembly connected to the housing and sealing the first opening;

[0007] A first sealing member is arranged between the cover plate assembly and the shell. The first sealing member bypasses the side surface of the cover plate assembly and is sealed with the cover plate assembly and the shell. A gap is provided between the first sealing member and the side surface of the cover plate assembly.

[0008] In one embodiment, the shell includes a buckling portion buckled with the cover assembly, the first sealing member is located between the buckling portion and the cover assembly, and the first sealing member protrudes from the buckling portion.

[0009] In one embodiment, the buckling portion and the first sealing member bypass the side surface of the cover assembly and buckle with opposite sides of the cover assembly, and the first sealing member at least protrudes from a portion of the buckling portion located on one side of the cover assembly.

[0010] In one embodiment, a pressure relief groove is provided on the cover plate assembly. The pressure relief groove is annular, and a diameter D of the pressure relief groove and a diameter D1 of the cover plate assembly satisfy the relationship: 0.5D1<D<D1.

[0011] In one embodiment, the battery further includes a protective layer, and the protective layer is at least arranged on a side of the shell facing the accommodating cavity; the thickness of the protective layer is greater than or equal to 0.5 microns and less than or equal to 10 microns.

[0012] In one embodiment, the battery includes a cell assembly and insulating tape, the cell assembly is located in the shell, the insulating tape is arranged between the side surface of the cell assembly and the side wall of the shell, and the insulating tape forms a folding area on the side of the cell assembly facing one end of the shell.

[0013] In one embodiment, the battery includes a terminal assembly, which is insulated and connected to one end of the shell away from the cover plate assembly. The battery cell assembly includes a positive current collector disk, which is electrically connected to the terminal assembly. The insulating tape is arranged between the side surface of the positive current collector disk and the side wall of the shell, and the folding area is formed on the side of the positive current collector disk facing the terminal assembly.

[0014] In one embodiment, the battery further includes a cell assembly and a first insulating member, the cell assembly is located in the shell, the first insulating member is located in the shell, the first insulating member is located on a side of the cell assembly facing one end of the shell, a notch is provided on a side surface of the first insulating member, and the notch penetrates the first insulating member along the thickness direction of the first insulating member.

[0015] In one embodiment, a plurality of the notches are formed on the side surface of the first insulating member, and the plurality of the notches are arranged along the circumference of the first insulating member.

[0016] In one embodiment, the plurality of notches are distributed at equal intervals along the circumference of the first insulating member.

[0017] In one embodiment, an angle formed by a side wall of the notch and a bottom surface of the notch is an acute angle or a right angle.

[0018] In one embodiment, the battery further comprises a terminal assembly, the terminal assembly is connected to an end of the shell away from the cover plate assembly, and a first through hole is formed in the terminal assembly.

[0019] In one embodiment, a first groove is formed on a side of the terminal assembly facing away from the housing, and the first through hole is formed at the bottom of the first groove.

[0020] In one embodiment, the battery further includes a cell assembly, wherein the cell assembly is located within the shell and connected to the terminal assembly; the bottom of the first groove includes a first welding area for welding to the cell assembly, and the first welding area is arranged around the first through hole.

[0021] In one embodiment, the terminal assembly includes a pole and a second seal, the pole is connected to one end of the shell away from the cover plate assembly, and the first groove is opened on the pole; the second seal has an abutment portion protruding from the side facing the first through hole, and the abutment portion is used to abut against the bottom of the first groove.

[0022] In a second aspect, an embodiment of the present application provides a battery pack comprising any of the batteries described above.

[0023] Beneficial effects of the embodiments of the present application:

[0024] In an embodiment of the present application, the battery includes a shell, a cover plate assembly and a first seal, a first opening is formed at one end of the shell, the cover plate assembly is connected to the shell and seals the first opening, the first seal is arranged between the cover plate assembly and the shell, the first seal bypasses the side surface of the cover plate assembly and is sealed with the cover plate assembly and the shell, and there is a gap between the first seal and the side surface of the cover plate assembly. The present application leaves a gap between the first seal and the side surface of the cover plate assembly, so that during the buckling process of the cover plate assembly and the shell, the first seal will not squeeze the side surface of the cover plate assembly, thereby reducing the risk of deformation of the cover plate assembly and ensuring the overall structural stability and performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 is a schematic structural diagram of a battery provided in an embodiment of the present application;

[0027] Figure 2 is a structural schematic diagram of a first housing assembly provided in an embodiment of the present application;

[0028] Figure 3 It is a schematic diagram of a partial structure of a buckling area of ​​a housing and a cover assembly provided in an embodiment of the present application;

[0029] Figure 4 It is a schematic diagram of a partial structure of a buckling area of ​​a housing and a cover assembly provided in an embodiment of the present application;

[0030] Figure 5 is a structural schematic diagram of a second housing assembly provided in an embodiment of the present application;

[0031] Figure 6is a structural schematic diagram of a cover plate assembly provided in an embodiment of the present application;

[0032] Figure 7 It is a structural schematic diagram of a pressure relief tank provided in an embodiment of the present application;

[0033] Figure 8 is a schematic diagram of the structure of different types of through holes provided on a second protruding portion provided in an embodiment of the present application;

[0034] Fig. 9 is a schematic diagram of a matching structure between a third sealing member and a second protruding portion provided in an embodiment of the present application;

[0035] Fig.10 is a partial structural schematic diagram of a housing provided in an embodiment of the present application;

[0036] Fig.11 The embodiments of this application provide Fig.10 A schematic diagram of the structure of the central main body;

[0037] Fig.12 The embodiments of this application provide Fig.11 A magnified view of part A;

[0038] Fig.13 The embodiments of this application provide Fig.11 A magnified view of part B;

[0039] Fig.14 It is a structural schematic diagram of a sinking platform provided in an embodiment of the present application;

[0040] Fig.15 It is a schematic diagram of a partial structure in which a supporting portion in a shell is not recessed, provided in an embodiment of the present application;

[0041] Fig.16 is a schematic diagram of the end structure of the second equal-diameter section provided in an embodiment of the present application;

[0042] Fig.17 is a cross-sectional view of a battery after being covered with insulating tape provided by an embodiment of the present application;

[0043] Fig.18 is a top view of an insulating tape provided in an embodiment of the present application;

[0044] Fig.19 is a cross-sectional view of a battery provided in an embodiment of the present application;

[0045] Fig. 20 is a cross-sectional view of a current collecting plate provided in an embodiment of the present application;

[0046] Fig.21is a cross-sectional view of a battery provided in Example 2 of the present application;

[0047] Fig. 22 is a schematic diagram of the structure of the circulation channel provided in the embodiment of the present application;

[0048] Fig.23 is a three-dimensional schematic diagram of a battery provided in an embodiment of the present application;

[0049] Fig.24 is a three-dimensional schematic diagram of a first insulating member provided in an embodiment of the present application;

[0050] Fig.25 is a top view of a first insulating member provided in an embodiment of the present application;

[0051] Fig.26 is a cross-sectional view of a first insulating member provided in an embodiment of the present application;

[0052] Fig. 27 The embodiments of this application provide Fig.24 A partial enlarged view of the middle A;

[0053] Fig.28 This is a schematic diagram of the structure of the collector provided in the embodiment of the present application. Figure 1 ;

[0054] Fig.29 The embodiments of this application provide Fig.28 An enlarged schematic diagram of the local A shown;

[0055] Fig.30 This is a schematic diagram of the structure of the collector provided in the embodiment of the present application. Figure 2 ;

[0056] Fig.31 This is a schematic diagram of the structure of the collector provided in the embodiment of the present application. Figure 3 ;

[0057] Fig.32 This is a schematic diagram of the structure of the collector provided in the embodiment of the present application. Figure 4 ;

[0058] Fig.33 is a structural schematic diagram of a first terminal assembly provided in an embodiment of the present application;

[0059] Fig.34 This is a parameter diagram of the first terminal assembly provided in the embodiment of the present application.

[0060] Fig.35 The embodiments of this application provide Fig.34 A partial enlarged view of

[0061] Fig.36is a structural schematic diagram of a second terminal assembly provided in an embodiment of the present application;

[0062] Fig.37 is a schematic structural diagram of a third terminal assembly provided in an embodiment of the present application;

[0063] Fig.38 is a structural schematic diagram of a fourth terminal assembly provided in an embodiment of the present application;

[0064] Fig.39 is a structural schematic diagram of a fifth terminal assembly provided in an embodiment of the present application;

[0065] Fig.40 It is a structural schematic diagram of the sixth terminal assembly provided in an embodiment of the present application.

[0066] Description of reference numerals:

[0067] 1. Battery;

[0068] 10, shell assembly; 11, shell; 111, buckling portion; 1111, buckling portion; 1112, supporting portion; 112, main body; 1121, base; 1122, bending portion; 1123, supporting portion; 1124, sink; 1125, flaring section; 1126, first equal diameter section; 1127, second equal diameter section; 113, first opening; 114, second opening; 12, cover plate assembly; 121, pressure relief groove; 123, first protrusion; 124, recessed portion; 125, second protrusion; 1251, second through hole; 126, third sealing member; 1261, transition portion; 13, first sealing member; 131, first sealing portion; 132, second sealing portion; 133, third sealing portion; 14, first air chamber; 15, second air chamber;

[0069] 20, terminal assembly; 21, pole; 211, first through hole; 212, first groove; 213, first welding area; 214, first connecting portion; 2141, first rib; 215, second connecting portion; 216, riveted portion; 217, second groove; 22, second insulating member; 221, first protective portion; 23, third insulating member; 231, second protective portion; 24, second sealing member; 241, abutting portion; 25, pressing ring; 251, first supporting portion; 252, second supporting portion; 253, second rib

[0070] 30, battery cell assembly; 31, positive electrode current collecting disk; 32, negative electrode current collecting disk; 33, winding core; 331, end face; 332, side face; 34, circulation channel; 35, current collecting disk; 351, protrusion; 352, disk body; 353, third through hole; 36, second welding area; 360, welding line; 361, bending portion; 3611, first connecting section; 3612, second connecting section; 300, central portion; 311, connecting member; 321, first gap; 322, second gap;

[0071] 40, insulating tape; 401, first area; 402, second area;

[0072] 50, first insulating member; 501, third groove; 502, inner ring reinforcement rib; 503, outer ring reinforcement rib; 504, connecting reinforcement rib; 505, transition slope; 506, notch; 507, fourth through hole. DETAILED DESCRIPTION

[0073] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise stated, the directional words such as "upper" and "lower" used generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0074] First, the present application embodiment provides a battery, such as Figure 1 and Figure 2 As shown, the battery 1 includes a shell 11 , a receiving cavity is formed in the shell 11 , and the receiving cavity is used to receive the battery cell assembly 30 . A first opening 113 is formed at one end of the shell 11 to facilitate the assembly of the battery cell assembly 30 into the shell.

[0075] The battery 1 includes a cover assembly 12 , which is connected to the shell 11 and seals the first opening 113 to achieve sealed protection for the battery cell assembly 30 placed in the shell 11 to prevent the battery cell assembly 30 from being corroded by the external environment, thereby ensuring the performance of the battery 1 .

[0076] The battery 1 includes a first seal 13, which is disposed between the cover assembly 12 and the housing 11. The first seal 13 bypasses the side surface of the cover assembly 12 and is sealed with the cover assembly 12 and the housing 11. That is, the first seal 13 is elastic, and when the cover assembly 12 and the housing 11 are buckled, the first seal 13 can be squeezed, thereby achieving a sealed connection between the cover assembly 12 and the housing 11.

[0077] Among them, there is a gap between the first seal 13 and the side surface of the cover assembly 12, that is, when the first seal 13 bypasses the cover assembly 12 for sealing, it will maintain a certain distance from the side surface of the cover assembly 12, so that when the first seal 13 is squeezed during the fastening process of the cover assembly 12 and the shell 11, the first seal 13 will not squeeze the side surface of the cover assembly 12, thereby effectively reducing the risk of deformation of the cover assembly 12.

[0078] In the embodiment of the present application, the battery 1 includes a shell 11, a cover assembly 12 and a first seal 13. A first opening 113 is formed at one end of the shell 11. The cover assembly 12 is connected to the shell 11 and seals the first opening 113. The first seal 13 is arranged between the cover assembly 12 and the shell 11. The first seal 13 bypasses the side surface of the cover assembly 12 and is sealed with the cover assembly 12 and the shell 11. There is a gap between the first seal 13 and the side surface of the cover assembly 12. The present application leaves a gap between the first seal 13 and the side surface of the cover assembly 12, so that during the buckling process of the cover assembly 12 and the shell 11, the first seal 13 will not squeeze the side surface of the cover assembly 12, thereby reducing the risk of deformation of the cover assembly 12 and ensuring the overall structural stability and performance of the battery 1.

[0079] Optional, such as Figure 2 and Figure 3 As shown, the shell 11 includes a snap-fitting portion 111 snapped with the cover assembly 12, and the first seal 13 is located between the snap-fitting portion 111 and the cover assembly 12, and the first seal 13 protrudes from the snap-fitting portion 111, that is, when the shell 11 is snap-fitted with the cover assembly 12 through the first seal 13, the first seal 13 will protrude from the edge of the snap-fitting portion 111 to ensure that there is a sufficient contact area between the snap-fitting portion 111 and the first seal 13, thereby improving the sealing between the shell 11 and the cover assembly 12.

[0080] The buckle part 111 and the first seal 13 bypass the side surface of the cover assembly 12 and buckle with the opposite sides of the cover assembly 12, and the first seal 13 at least protrudes from the part of the buckle part 111 located on one side of the cover assembly 12. That is, the buckle part 111 and the first seal 13 bypass the side surface of the cover assembly 12 together and wrap the upper and lower sides of the edge area of ​​the cover assembly 12 to achieve the sealing between the shell 11 and the cover assembly 12, and the first seal 13 protrudes from the buckle part 111 located on the upper side of the cover assembly 12, or protrudes from the buckle part 111 located on the lower side of the cover assembly 12, or protrudes from the buckle part 111 located on the upper and lower sides of the cover assembly 12 at the same time, so that there is a sufficient contact area between the buckle part 111 and the first seal 13, thereby improving the sealing between the shell 11 and the cover assembly 12.

[0081] It should be noted that the specific protrusion mode of the first sealing member 13 relative to the buckling portion 111 can be selected and adjusted according to actual design requirements, and is not particularly limited here.

[0082] like Figure 3 As shown, the first sealing member 13 includes a first sealing portion 131 that is buckled between the housing 11 and the cover assembly 12 on opposite sides, and a second sealing portion 132 that protrudes from the housing 11, and the thickness T1 of the first sealing portion 131 and the thickness T2 of the second sealing portion 132 satisfy the relationship: 0.1≤T1 / T2≤0.8. That is, the first sealing portion 131 is the portion of the first sealing member 13 that is compressed due to extrusion when the housing 11 and the cover assembly 12 are buckled, and the second sealing portion 132 is the portion of the first sealing member 13 that is not squeezed, that is, the thickness of the second sealing portion 132 is the initial thickness of the first sealing member 13.

[0083] If the ratio of T1 / T2 is too small, it means that the compression amount of the first seal 13 when being squeezed is too large, which may cause the first seal 13 to fail due to excessive compression, thereby affecting the sealing effect of the shell 11 and the cover assembly 12, and even causing the side of the cover assembly 12 to expand too much, causing the snap-fitting area between the cover assembly 12 and the shell 11 and the pressure relief groove structure arranged on the cover assembly 12 to deform, thereby affecting the sealing effect; if the ratio of T1 / T2 is too large, it means that the compression amount of the first seal 13 when being squeezed is too small, which may cause the snap-fitting between the shell 11 and the first seal 13 and between the first seal 13 and the cover plate to be not tight enough, which will also affect the sealing effect between the shell 11 and the cover assembly 12.

[0084] In the embodiment of the present application, the thickness T1 of the first sealing portion 131 and the thickness T2 of the second sealing portion 132 are set to 0.1≤T1 / T2≤0.8, which can ensure that the compression amount of the first sealing member 13 is controlled within a moderate range, so that the first sealing member 13 can have a sealing effect and will not fail due to excessive compression, thereby ensuring effective sealing between the shell 11 and the cover assembly 12.

[0085] In the actual production process, the ratio can be set to 0.1, 0.2, 0.4, 0.6 or 0.8, etc. The specific value can be selected and adjusted according to actual design requirements, and there is no special limitation here.

[0086] Optional, such as Figure 3 and Figure 4 As shown, the first sealing member 13 also includes a third sealing portion 133 that is buckled between the housing 11 and the side surface of the cover assembly 12. There is a gap between the third sealing portion 133 and the side surface of the cover assembly 12. The thickness T3 of the third sealing portion 133 and the thickness T2 of the second sealing portion 132 satisfy the relationship: 1≤T3 / T2≤1.5. That is, when the first sealing member 13 bypasses the side surface of the cover assembly 12 and buckles with the cover assembly 12, it can maintain a distance from the side surface of the cover assembly 12 to prevent the first sealing member 13 from being squeezed to the side surface of the cover assembly 12 when deformed by force, thereby preventing the cover assembly 12 from being deformed or collapsed during the sealing process, thereby ensuring the overall structural stability of the housing assembly 10.

[0087] Among them, when the first sealing part 131 that is buckled on the opposite sides of the cover assembly 12 is compressed due to being squeezed, the first compressed part will be compressed toward the third sealing part 133, and there is a gap between the third sealing part 133 and the side surface of the cover assembly 12, so that the third sealing part 133 may expand. If the expansion amount of the third first sealing part 13 is too large, it means that the compression amount of the first sealing part 131 is also too large, which may cause the overall sealing failure of the first sealing part 13, and may also cause the third first sealing part 13 to be squeezed to the side surface of the cover assembly 12, thereby causing deformation of the cover assembly 12 and affecting the overall structural stability of the shell assembly 10.

[0088] In the embodiment of the present application, by setting the thickness T3 of the third sealing portion 133 and the thickness T2 of the second sealing portion 132 to 1≤T3 / T2≤1.5, it is possible to ensure that the expansion amount of the first sealing member 13 is controlled within a moderate range, so that the first sealing member 13 can have a sealing effect and will not fail due to excessive expansion, thereby ensuring effective sealing between the shell 11 and the cover assembly 12.

[0089] In the actual production process, the ratio can be set to 1, 1.1, 1.2, 1.3, 1.4 or 1.5, etc. The specific value can be selected and adjusted according to actual design requirements, and there is no special limitation here.

[0090] like Figure 4 As shown, the shell 11 includes a pressing portion 1111 that is snapped onto the side of the cover assembly 12 away from the other end of the shell 11, and the minimum height difference between the side of the pressing portion 1111 away from the cover assembly 12 and the side of the cover assembly 12 away from the other end of the shell 11 is T4≤1mm. That is, when the shell 11 is snapped onto the cover assembly 12, the upper surface of the pressing portion 1111 will protrude from the upper surface of the cover assembly 12. If the amount of protrusion of the pressing portion 1111 is too large, the overall height of the shell assembly 10 will be too large, and the flatness of the surface of the shell assembly 10 will also be affected. By setting the height difference T4 to T4≤1mm, the present application can ensure that the shell 11 and the cover assembly 12 are effectively snapped together while avoiding a significant impact on the overall height of the shell assembly 10.

[0091] The shell 11 also includes a main body 112, and a support portion 1112 that is snap-fitted to the side of the cover assembly 12 facing the other end of the shell 11, the support portion 1112 is connected to the main body 112, and the absolute value of the height difference T5 between the lowest point of the support portion 1112 in the thickness direction of the cover assembly 12 and the connection between the support portion 1112 and the main body 112 is less than or equal to 5 mm.

[0092] Among them, when the lowest point of the support part 1112 in the thickness direction of the cover plate assembly 12 is lower than the connection between the support part 1112 and the main body part 112, the support part 1112 is buckled toward the inside of the main body part 112. At this time, if the height difference is too large, it may cause the support part 1112 to squeeze the battery cell assembly 30 placed in the main body part 112; when the lowest point of the support part 1112 in the thickness direction of the cover plate assembly 12 is higher than the connection between the support part 1112 and the main body part 112, the support part 1112 is buckled toward the top of the main body part 112. At this time, if the height difference is too large, it may cause the overall height of the shell assembly 10 to be too large, and also cause the space utilization rate in the shell 11 to be low, thereby affecting the energy density of the battery 1.

[0093] In some embodiments, Figure 3As shown, the outer diameter T6 of the main body 112 and the inner diameter T7 of the support portion 1112 satisfy the relationship: 0.3mm≤T6-T7≤10mm. Among them, the support portion 1112 is a bending structure, and the corners are rounded at the bend. The inner diameter of the support portion 1112 refers to the inner diameter corresponding to the center of the rounded corner. If the difference between the outer diameter T6 of the main body 112 and the inner diameter T7 of the support portion 1112 is small, it means that the support portion 1112 is bent into the shell 11 more, and the bend of the support portion 1112 is formed by rolling, which may cause the support portion 1112 to be broken; if the difference between the outer diameter T6 of the main body 112 and the inner diameter T7 of the support portion 1112 is large, it means that the support portion 1112 is bent into the shell 11 less, which may cause the support portion 1112 and the cover plate assembly 12 to have a poor snapping effect.

[0094] In the embodiment of the present application, by setting the relationship between the outer diameter T6 of the main body 112 and the inner diameter T7 of the support portion 1112 to 0.3mm≤T6-T7≤10mm, it is possible to avoid the support portion 1112 from breaking and ensure the sealing effect between the shell 11 and the cover plate assembly 12.

[0095] In the actual manufacturing process, the difference can be set to 0.3mm, 1mm, 2mm, 5mm, 8mm or 10mm, etc., and there is no special limitation here.

[0096] In other embodiments, the inner diameter of the buckling portion 1111 is less than or equal to the inner diameter of the supporting portion 1112 to ensure that the buckling portion 1111 and the upper surface of the cover assembly 12 have sufficient buckling area, thereby ensuring the sealing effect of the shell 11 and the cover assembly 12.

[0097] Among them, the cover assembly 12 and the buckling portion 1111 overlap in the axial direction of the shell 11, and the width of the overlapping portion in the radial direction of the shell 11 is greater than or equal to 0.2 mm, that is, the buckling width of the upper surface of the cover assembly 12 and the first seal 13 and the buckling portion 1111 is greater than or equal to 0.2 mm, so as to ensure that the buckling portion 1111 and the cover assembly 12 have sufficient sealing area, thereby ensuring effective sealing between the shell 11 and the cover assembly 12.

[0098] Correspondingly, the part where the support portion 1112 abuts against the first seal 13 and the orthographic projection of the cover assembly 12 in the axial direction of the shell 11 overlap, and the width of the overlapping part in the radial direction of the shell 11 is greater than or equal to 0.2 mm, that is, the snap-fitting width between the lower surface of the cover assembly 12 and the first seal 13 and the support portion 1112 is greater than or equal to 0.2 mm, so as to ensure that the support portion 1112 and the cover assembly 12 have sufficient sealing area, thereby ensuring effective sealing between the shell 11 and the cover assembly 12.

[0099] In addition, if Figure 3 As shown, the width T8 of the buckling portion 1111 in the radial direction of the housing 11 and the diameter T9 of the cover plate assembly 12 satisfy the relationship: T8 ≥ 0.03T9. If the width of the buckling portion 1111 in the radial direction of the housing 11 is too small, the buckling area between the buckling portion 1111 and the cover plate assembly 12 will also be too small, thereby affecting the sealing effect of the housing 11 and the cover plate assembly 12.

[0100] In some other embodiments, a chamfer is provided at the connection between the main body portion 112 and the support portion 1112, that is, when the support portion 1112 is bent toward the inside of the main body portion 112, the chamfer is performed at the connection between the main body portion 112 and the support portion 1112 to avoid the support portion 1112 from breaking due to stress concentration during the bending process.

[0101] The diameter of the rounded corner is greater than or equal to the thickness of the main body 112 to ensure that the support portion 1112 has a sufficient bending arc when bending toward the inside of the main body 112, thereby further preventing the support portion 1112 from breaking due to stress concentration during the bending process.

[0102] It should be noted that a protrusion is provided on the cover assembly 12 to increase the overall air storage space of the shell assembly 10. When the shell 11 and the cover assembly 12 are buckled together through the first seal 13, the distance between the edge of the buckling portion 1111 and the protrusion on the cover assembly 12 is greater than or equal to 0, and the distance between the first seal 13 and the protrusion on the cover assembly 12 is greater than or equal to 0, so as to avoid the setting of the protrusion on the cover assembly 12 affecting the sealing effect of the shell 11 and the cover assembly 12.

[0103] In some embodiments, Figure 5 As shown, the cover assembly 12 includes a first protrusion 123 protruding in a direction away from the housing 11, and a recessed portion 124 recessed in a direction close to the housing 11, the recessed portion 124 is used to abut against the battery cell assembly 30, and the first protrusion 123, the recessed portion 124 and the housing 11 are used to enclose the battery cell assembly 30 to form a first air chamber 14. That is, when the cover assembly 12 is assembled with the housing 11, the recessed portion 124 on the cover assembly 12 will directly abut against the battery cell assembly 30 to achieve the charged design of the cover assembly 12, and the first protrusion 123, the recessed portion 124, the housing 11 and the battery cell assembly 30 will enclose to form the first air chamber 14, and the first air chamber 14 is used to store the gas generated during the operation of the battery 1. In other words, the provision of the first air chamber 14 can effectively improve the gas storage capacity of the housing assembly 10, thereby helping to improve the safety performance and service life of the housing assembly 10, and further improve the safety and service life of the battery 1.

[0104] In some embodiments, the first protrusion 123 and the recess 124 are annular, and the recess 124 is located in the area surrounded by the first protrusion 123, that is, the first air chamber 14 is also arranged in an annular shape. By arranging the first air chamber 14 in an annular shape, the gas stored in the first air chamber 14 is more evenly distributed in the housing assembly 10, so that the force on the cover assembly 12 is also more even, which helps to improve the stability of the housing assembly 10 during use.

[0105] Among them, the width of the recessed portion 124 (the difference between the outer diameter and the inner diameter) is greater than or equal to 4 mm and less than or equal to 8 mm. If the width of the recessed portion 124 is too small, the area of ​​the recessed portion 124 used to abut against the battery cell assembly 30 will be too small, which is not conducive to the charging design of the cover assembly 12; if the width of the recessed portion 124 is too large, it will cause the air chamber space in the shell assembly 10 to be reduced, thereby affecting the gas storage capacity of the shell assembly 10.

[0106] In the actual manufacturing process, the width of the recessed portion 124 can be set to 4 mm, 5 mm, 6 mm, 7 mm or 8 mm, etc. The specific width value can be adjusted according to actual design requirements, and there is no special limitation here.

[0107] In addition, if Figure 6 As shown, in the embodiment of the present application, the height difference P4 between the side of the first protrusion 123 facing away from the housing 11 and the side of the recessed portion 124 facing away from the housing 11 is set to 0.5mm≤P4≤2mm. If the height difference is too small, the space of the first air chamber 14 will be small, which is not conducive to the storage of gas; if the height difference is too large, the space utilization rate inside the housing assembly 10 will be low, resulting in a low energy density of the battery 1.

[0108] In the actual production process, the height difference P4 can be set to 0.5mm, 1mm, 1.5mm or 2mm, etc. The specific value can be selected and adjusted according to actual design requirements, and there is no special limitation here.

[0109] In some embodiments, Figure 1 As shown, the battery cell assembly 30 includes a positive current collector 31, a negative current collector 32 and a winding core 33, the positive current collector 31 is located between the winding core 33 and the terminal assembly 20, the negative current collector 32 is located between the winding core 33 and the cover assembly 12, and the maximum value T10 of the height difference between the side of the cover assembly 12 away from the terminal assembly 20 and the negative current collector 32 is ≥1mm. That is, there is sufficient gas storage space between the cover assembly 12 and the negative current collector 32 to ensure that the shell assembly 10 has sufficient gas storage capacity, thereby improving the overall service life of the battery 1.

[0110] In some embodiments, Figure 5 and Figure 7 As shown, a pressure relief groove 121 is provided on the first protrusion 123. When the first protrusion 123 is arranged in a ring shape, the pressure relief groove 121 extends in a ring shape along the circumference of the first protrusion. Since a first air chamber 14 is correspondingly formed below the first protrusion 123, by arranging the pressure relief groove 121 on the first protrusion 123, when the gas pressure stored in the first air chamber 14 is relatively large, the pressure can be released in time through the pressure relief groove 121, thereby helping to reduce the risk of explosion of the shell assembly 10 during use.

[0111] The bottom of the pressure relief groove 121 is the position that is opened during pressure relief. To ensure that the pressure relief groove 121 has a sufficient pressure relief area, the width of the bottom of the pressure relief groove 121 can be set to be greater than or equal to 0.02 mm and less than or equal to 0.8 mm. If the width of the bottom of the pressure relief groove 121 is too small, the pressure relief area will be too small, and the pressure required for the gas to open the pressure relief groove 121 will be too large, thereby increasing the risk of explosion; if the width of the bottom of the pressure relief groove 121 is too large, the area of ​​the weak area on the cover plate assembly 12 will be too large, which will cause the cover plate assembly 12 to be unable to withstand sufficient gas pressure, thereby reducing the overall safety performance and service life of the shell assembly 10.

[0112] In the actual manufacturing process, the width of the bottom of the pressure relief groove 121 can be set to 0.02mm, 0.05mm, 0.1mm, 0.3mm, 0.5mm or 0.8mm, etc. The specific width value can be selected and adjusted according to actual design requirements, and there is no special limitation here.

[0113] In other embodiments, Figure 7 As shown, the angle β formed by the side wall of the pressure relief groove 121 and the bottom of the pressure relief groove 121 satisfies the relationship: 95°≤β≤165°, that is, the side wall of the pressure relief groove 121 tends to expand, so that the pressure relief groove 121 can be pulled open during pressure relief. If the angle is too large, the stamping area will be too large, forming will be difficult, and the strength of the cover plate assembly 12 will be reduced, and it will not be able to withstand sufficient gas pressure, thereby reducing the overall safety performance and service life of the shell assembly 10; if the angle is too small, the pressure required for the gas to open the pressure relief groove 121 will be too large, thereby increasing the risk of explosion. At the same time, if the angle is too small, the pressure relief groove 121 will be deformed during the battery 1 manufacturing process, thereby reducing safety.

[0114] In the actual production process, the angle can be set to 95°, 110°, 125°, 150° or 165°, etc. The specific angle value can be selected and adjusted according to actual design requirements, and there is no special restriction here.

[0115] Optional, such as Figure 5As shown, the cover plate assembly 12 also includes a second protrusion 125 protruding in a direction away from the housing 11, and the second protrusion 125 is located in the area surrounded by the recessed portion 124. The second protrusion 125 and the recessed portion 124 are used to enclose the battery cell assembly 30 to form a second air chamber 15, that is, the second air chamber 15 is located near the middle area of ​​the housing assembly 10, and the second air chamber 15 is also arranged in a ring shape. By forming the second air chamber 15 in the housing assembly 10, the gas storage capacity of the housing assembly 10 can be further effectively improved, thereby helping to improve the safety performance and service life of the housing assembly 10, and further improve the service life of the battery 1.

[0116] Among them, Figure 6 As shown, the second protrusion 125 is provided with a second through hole 1251, and the second through hole 1251 penetrates the second protrusion 125 along the thickness direction of the second protrusion 125. The second through hole 1251 can be used as a liquid injection hole to facilitate the liquid injection operation during the manufacturing process of the battery 1; or, the second through hole 1251 can also be used as an exhaust hole to facilitate the exhaust of the gas generated during the formation process of the battery 1, thereby helping to improve the storage capacity of the gas generated during the use of the battery 1, and further improve the safety of the battery 1 during use.

[0117] In some embodiments, the protrusion height of the second protrusion 125 is less than the protrusion height of the first protrusion 123, that is, the second protrusion 125 is designed to be sunken relative to the first protrusion 123. This is because a second through hole 1251 is opened on the second protrusion 125, and the second through hole 1251 will be sealed later. The sinking design of the second protrusion 125 can avoid the height of the corresponding position of the second through hole 1251 after sealing being higher than the height of the first protrusion, thereby affecting the overall height of the shell assembly 10 and the flatness of the surface of the cover assembly 12.

[0118] The height difference between the second protrusion 125 and the first protrusion 123 is greater than or equal to 0.3 mm and less than or equal to 1 mm. If the height difference between the second protrusion 125 and the first protrusion 123 is too large, the height of the second protrusion 125 will be too large, thereby affecting the overall height of the housing assembly 10, or the height of the first protrusion will be too small, which is not conducive to the formation of the air chamber; if the height difference between the second protrusion 125 and the first protrusion 123 is too small, after the second through hole 1251 on the second protrusion 125 is sealed, the height at the sealing position will be higher than the height of the first protrusion 123, thereby affecting the flatness of the surface of the cover assembly 12.

[0119] In the actual manufacturing process, the height difference between the second protrusion 125 and the first protrusion 123 can be set to 0.3mm, 0.5mm, 0.8mm or 1mm, etc. The specific difference can be selected and adjusted according to actual design requirements, and there is no special limitation here.

[0120] In other embodiments, Figure 6 As shown, the diameter P1 of the second through hole 1251 on the second protrusion 125 and the diameter P2 of the second protrusion 125 satisfy the relationship: 1mm<P1<0.8P2. If the diameter of the second through hole 1251 is too small, it is not conducive to the discharge of the gas generated during the formation process of the battery 1. If the diameter of the second through hole 1251 is too large, it will affect the overall structural strength of the cover plate assembly 12 and increase the difficulty of sealing the second through hole 1251.

[0121] In some other embodiments, Figure 8 As shown, along the protruding direction of the second protruding portion 125, the side wall of the second through hole 1251 is at least partially inclined in a direction away from the axis of the second through hole 1251, and the inclination angle α is ≤ 70°, that is, along the protruding direction of the second protruding portion 125, the side wall of the second through hole 1251 is at least partially expanding to facilitate the discharge of gas.

[0122] In the protruding direction of the second protruding portion 125, the second through hole 1251 may include a straight section and an inclined section that are interconnected, and the inclined angle of the inclined section is α. The setting of the inclined section facilitates the subsequent sealing operation of the second through hole 1251; or, in the protruding direction of the second protruding portion 125, the side wall of the second through hole 1251 is inclined as a whole, that is, the second through hole 1251 is an inclined hole, and the inclined angle is α. The specific structure of the second through hole 1251 can be selected and adjusted according to actual design requirements, and is not particularly limited here.

[0123] Optional, such as Fig. 9 As shown, the housing assembly 10 further includes a third sealing member 126, which is connected to the second protrusion and seals the second through hole 1251; the third sealing member 126 includes a transition portion 1261 that is recessed toward the housing 11, and the transition portion 1261 extends into the second through hole 1251, that is, the third sealing member 126 is in an inverted "X" shape as a whole. Since the third sealing member 126 itself is relatively thin, by providing the transition portion 1261 on the third sealing member 126, it is helpful to place the third sealing member 126 in the second through hole 1251, so as to facilitate welding with the second protrusion 125.

[0124] Among them, the diameter P3 of the transition part 1261 and the diameter P1 of the second through hole 1251 satisfy the relationship: 0.2P1≤P3≤P1; if the diameter of the transition part 1261 is too large, it may cause the third sealing component 126 to be unable to be assembled into the second through hole 1251, thereby failing to weld and seal the second through hole 1251; if the diameter of the transition part 1261 is too small, it may cause the third sealing component 126 to be difficult to place into the second through hole 1251, thereby affecting the efficiency and quality of the welding seal.

[0125] In the actual manufacturing process, the specific value of the diameter of the transition portion 1261 can be designed and adjusted according to the diameter of the second through hole 1251, and no special limitation is made here.

[0126] It should be noted that since the third seal 126 is installed in the second through hole 1251 of the second protrusion 125, it is necessary to ensure that the lower surface of the transition section does not exceed the lower surface of the second protrusion 125 after assembly to avoid interference between the third seal 126 and the battery cell assembly 30 located in the shell 11.

[0127] In some embodiments, when the second through hole 1251 is a straight hole, the welding surface (side surface) of the third sealing member 126 can be chamfered, and the welding surface after the chamfering treatment forms an acute angle (such as 90°) with the side of the third sealing member 126 facing the second through hole 1251. Fig. 9 As shown), so that when sealing, welding can be performed through the gap between the welding surface of the third sealing member 126 and the side wall of the second through hole 1251, thereby ensuring the sealing effect of the third sealing member 126.

[0128] It should be noted that, in order to ensure the welding effect between the third sealing member 126 and the side wall of the second through hole 1251, the width of the welding surface after chamfering in the radial direction of the second through hole 1251 can be set to be greater than or equal to 0.2 mm, and its height in the axial direction of the second through hole 1251 can be set to be greater than or equal to 0.2 mm. The specific width and height values ​​can be selected and adjusted according to actual design requirements, and are not particularly limited here.

[0129] In other embodiments, when the second through hole 1251 is composed of an inclined section and a straight section, the welding surface of the third seal 126 can also be chamfered. At this time, the inclination direction of the welding surface after the chamfering treatment is consistent with the inclination direction of the inclined section of the second through hole 1251, so that the welding surface of the third seal 126 can fit with the side wall of the inclined section, thereby facilitating the welding of the third seal 126 and the side wall of the second through hole 1251.

[0130] like Figure 6As shown, a pressure relief groove 121 is provided on the cover plate assembly 12. The pressure relief groove 121 is annular, and the diameter D of the pressure relief groove 121 and the diameter D1 of the cover plate assembly 12 satisfy the relationship: 0.5D1<D<D1. By providing the pressure relief groove 121 on the cover plate assembly 12, when a large amount of gas is generated during use of the battery 1, the cover plate assembly 12 can be flushed through the pressure relief groove 121 to achieve pressure relief, thereby reducing the risk of explosion of the battery 1 due to thermal runaway. By setting the relationship between the diameter D of the pressure relief groove 121 and the diameter D1 of the cover plate assembly 12 to 0.5D1<D<D1, it is possible to ensure that the pressure relief groove 121 has sufficient pressure relief area, thereby ensuring the safe use of the battery 1.

[0131] It should be noted that the opening pressure of the pressure relief groove 121 is P=4στ / D, where σ is the tensile strength of the material at the location of the pressure relief groove 121, and τ is the thickness at the location of the pressure relief groove 121. To ensure the safe use of the battery 1, the opening pressure of the pressure relief groove 121 needs to satisfy 0.3Mpa<P<5Mpa, and the thickness at the location of the pressure relief groove 121 needs to satisfy 30μm<τ<200μm. If the opening pressure of the pressure relief groove 121 is too small or the thickness at the location of the pressure relief groove 121 is too small, the service life of the battery 1 will be too short; if the opening pressure of the pressure relief groove 121 is too large or the thickness at the location of the pressure relief groove 121 is too large, the probability of safety accidents such as explosion of the battery 1 will be greater.

[0132] In some embodiments, the battery 1 further includes a protective layer (not shown in the figure), which is disposed at least on one side of the cover assembly 12 facing the accommodating cavity, and the thickness of the protective layer is greater than or equal to 0.5 microns and less than or equal to 10 microns. If the thickness of the protective layer is too small, it cannot effectively prevent corrosion; if the thickness of the protective layer is too large, it may affect the conductive design of the cover assembly 12, and may also increase the overall height of the battery 1. In the actual manufacturing process, the thickness of the protective layer can be set to 0.5 microns, 1 micron, 2 microns, 5 microns, 8 microns or 10 microns, etc. The specific value of the thickness can be selected and adjusted according to the design requirements, and there is no special restriction here.

[0133] Among them, the protective layer can be set only on the side of the cover plate assembly 12 facing the accommodating cavity to reduce the risk of the cover plate assembly 12 being corroded by the electrolyte; or, the protective layer can also be set on the side of the cover plate assembly 12 away from the accommodating cavity to reduce the risk of the cover plate assembly 12 being corroded by the external environment.

[0134] In other embodiments, the thickness of the protective layer at the position corresponding to the pressure relief groove 121 is less than the thickness of the protective layer at other corresponding positions, so as to ensure that the protective layer plays a protective role on the cover plate assembly 12 while reducing the impact of the protective layer on the opening of the pressure relief groove 121.

[0135] To solve the problem that the explosion-proof valve in the related art is prematurely broken due to excessive pressure instantaneously received, please refer to Fig.10 , Fig.10 which is a schematic structural diagram of the housing 11 provided in this embodiment. This embodiment provides a housing 11 applied to the battery 1. The housing 11 includes a main body portion 112 and a support portion 1112 connected to the main body portion 112. The support portion 1112 is recessed toward the inside of the housing 11 in the first direction. Among them, the first direction can be referred to Fig.10 the X direction in

[0136] Specifically, when the battery 1 is in a thermal runaway state or the pressure inside the battery 1 surges due to other factors, the pressure inside the battery 1 will cause the support portion 1112 to deform toward the outside of the housing 11, so that the recess depth of the support portion 1112 gradually decreases. Since the deformation of the support portion 1112 is progressive, during the process of the increase in the pressure inside the battery 1, the deformation of the support portion 1112 causes the space inside the battery 1 to gradually increase until the pressure inside the battery 1 is not sufficient to cause the support portion 1112 to deform or the deformation amount of the support portion 1112 reaches the maximum value. During the process of the increase in the space inside the battery 1, the pressure inside the battery can be gradually released, so that the pressure inside the battery 1 will not increase sharply in a short time.

[0137] This structural design can effectively delay the triggering time of the explosion-proof valve, thereby increasing the service life of the battery 1. In addition, if the pressure inside the battery 1 continues to increase after the deformation amount of the support portion 1112 reaches the maximum value until the cover plate assembly 12 for sealing the battery 1 is broken and at least part of the cover plate assembly 12 flies out of the inside of the battery 1, the support portion 1112 may be stretched under the influence of the cover plate assembly 12 during this process, so as to increase the spraying area of the internal substances when the battery 1 is in thermal runaway, so as to increase the spraying rate of the internal substances of the battery 1, thereby reducing the incidence rate of safety problems such as explosion that may be caused by a small spraying rate when the battery 1 is in a thermal runaway state.

[0138] Please refer to Fig.10 , the support portion 1112 includes two side walls opposite to each other in the second direction. The second direction is perpendicular to the first direction. Among them, the second direction can be referred to Fig.10 the Y direction in

[0139] Specifically, the minimum spacing H9 between the two side walls of the support portion 1112 cannot be too large to prevent the recessed space of the support portion 1112 from being too large, which would cause a significant reduction in the internal capacity of the battery 1. Therefore, in order to balance the relationship between the deformation of the support portion 1112 and the internal capacity of the battery 1, the minimum spacing between the two side walls is set to no more than 5% of the height of the battery 1 in this embodiment. This design fully considers the actual needs of the battery 1. After experimental verification, when the support portion 1112 meets the above conditions, it can ensure that when the internal pressure of the battery 1 increases sharply, the support portion 1112 can provide an effective relief effect, and the internal capacity of the battery 1 will not be significantly reduced due to the excessive spacing between the two side walls, thereby affecting the working performance and endurance of the battery.

[0140] In some embodiments, a chamfer is provided at the first connection between the support portion 1112 and the main body portion 112, and the chamfer is set to a rounded corner, in order to improve the molding quality of the support portion 1112. Specifically, the rounded corner design can effectively disperse stress during the concave molding process of the support portion 1112, thereby reducing the risk of damage to the support portion 1112 due to stress concentration during the molding process, thereby improving the overall stability and durability of the structure.

[0141] To further improve the stress dispersion effect, please refer to Fig.10 , the shell 11 is designed to meet the following conditions: H2≥1.5*H5, where H2 is the arc length of the chamfer at the first connection, and H5 is the thickness of the main body 112. This structure is designed to optimize the connection area between the support portion 1112 and the main body 112, and reduce the risk of material fatigue or cracks caused by stress concentration in the connection area during the recessed molding of the support portion 1112. In this embodiment, by setting the arc length H2 of the chamfer at the first connection to be no less than 1.5 times the thickness H5 of the main body 112, it has been experimentally verified that when the arc length H2 of the chamfer meets the above conditions, the support portion 1112 has higher toughness during the molding process and can effectively resist damage that may occur in an external high stress environment, especially during the process of hot forming or pressure forming, the shell 11 is less likely to break or deform due to stress concentration, thereby ensuring the reliability of the shell 11.

[0142] Please see Fig.10, the shell 11 not only includes the main body 112 and the support part 1112 as mentioned above, but also includes a pressing part 1111 connected to the support part 1112 and pressing the cover plate toward the support part 1112. Among them, the pressing part 1111 is configured to press the cover plate to prevent the cover plate from shaking or shifting. In order to reduce the risk of structural damage to the support part 1112 due to stress concentration during the molding process, in some embodiments, the second connection between the support part 1112 and the pressing part 1111 is provided with a chamfer, and the chamfer is a rounded corner, and the shell 11 satisfies the following conditions: H3≥1.2*H5. Among them, H3 is the arc length of the chamfer at the second connection, and H5 is the thickness of the main body 112. The structure is designed to optimize the connection area between the support part 1112 and the pressing part 1111, and reduce the risk of material fatigue or cracks due to stress concentration in the connection area during the recessed molding of the support part 1112.

[0143] In this embodiment, by setting the arc length H3 of the chamfer at the second connection to be no less than 1.2 times the thickness H5 of the main body 112, it is verified through experiments that when the arc length H3 of the chamfer meets the above conditions, the support portion 1112 has higher toughness during the forming process and can effectively resist damage that may occur in an external high stress environment, especially during the process of thermoforming or pressure forming, the shell 11 is less likely to crack or deform due to stress concentration, thereby ensuring the reliability of the shell 11.

[0144] In some embodiments, see Fig.10 , the shell 11 satisfies the following conditions: 20°≤H1≤90°, where H1 is the angle between the support portion 1112 and the main body 112. Specifically, in this embodiment, the angle between the support portion 1112 and the main body 112 is set to be no greater than 90°, that is, the support portion 1112 is bent downward relative to the horizontal plane as a whole, thereby reducing the occupancy rate of the support portion 1112 in the height direction, so as to provide a larger accommodation space inside the battery 1. In addition, the angle between the support portion 1112 and the main body 112 is set to be no less than 20°, so that when the internal pressure of the battery 1 increases, the support portion 1112 can be effectively stretched, thereby rapidly expanding the internal space of the battery 1, so as to provide a buffer for the pressure inside the battery 1.

[0145] In some embodiments, see Fig.10, the shell 11 satisfies the following condition: H10 ≥ 0.5 * H5. Among them, H10 is the thickness of the support portion 1112, and H5 is the thickness of the main body 112. Specifically, although the thinner support portion 1112 can reduce the overall weight of the battery 1, the structure is easily damaged during the molding process and when it is deformed outward, thereby affecting the safety of the battery 1. It has been verified through experiments that when the thickness H10 of the support portion 1112 is set within the above range, the support portion 1112 is not easily damaged during the molding process and when it is deformed toward the outside of the shell 11 under pressure, thereby ensuring the reliability of the shell 11.

[0146] In some embodiments, see Fig.11 , Fig.11 yes Fig.10 Schematic diagram of the structure of the main body, the main body 112 includes a base 201, a curved portion 202 and a support portion 203, and the base 201 is connected to the support portion 203 through the curved portion 202. Specifically, the base 201 and the support portion 203 form a continuous structure through the curved portion 202, so that the support portion 203 can play a supporting role as the bottom wall of the shell 11.

[0147] In some embodiments, see Fig.12 , Fig.12 yes Fig.11 In the enlarged view of part A, the thickness of the bend 202 gradually increases in the extension direction from one end of the bend 202 connected to the base 201 to the other end of the bend 202 connected to the support portion 203, so that the main body 112 can effectively disperse the stress when bending, thereby reducing the risk of damage. Furthermore, in order to better disperse the stress, the shell 11 satisfies the following conditions: F9 ≥ 0.8 * F8. Among them, F9 is the size of the outer fillet of the bend 202 in the height direction of the battery 1, and F8 is the thickness of the support portion 203. Specifically, it has been verified experimentally that when F9 is less than 0.8 * F8, the stress of the main body 112 is more concentrated during the bending process, which is easy to cause structural damage.

[0148] In some embodiments, see Fig.11 , Fig.13 , a sink 204 is provided at one end of the support portion 203 away from the bent portion 202, and the sink 204 is bent toward the inside of the battery 1 relative to the support portion 203, thereby enhancing the sealing of the shell 11 to a certain extent. Further, in order to ensure that the sink 204 is not easily torn during the manufacturing process, the shell 11 satisfies the following conditions: F19≤F8; wherein F8 is the thickness of the support portion 203, and F19 is the depth of the sink 204. It has been verified through experiments that when F19 is greater than F8, the sink 204 is likely to cause the support portion 203 to break during the manufacturing process.

[0149] In some embodiments, see Fig.13 , the housing assembly satisfies the following condition: W ≥ 0.05 mm. Wherein, W is the width of the sink 204. Specifically, in order to ensure the sealing performance of the sink 204 for the battery 1, the width W of the sink 204 is designed to be not less than 0.05 mm in this embodiment. It has been verified by experiments that when the width W of the sink 204 is less than 0.05 mm, its sealing performance is poor.

[0150] In some embodiments, see Fig.13 In order to ensure that the sink 204 is not easily damaged due to stress concentration during the manufacturing process, the edge of the sink 204 is set to be rounded. Further, in order to improve the effect of the support portion 1112 in dispersing stress during the manufacturing process of the sink 204, at least one bend in the sink 204 can be set to two rounded corners, and the arcs of the two rounded corners are in opposite directions.

[0151] In addition, in some embodiments, see Fig.14 , Fig.14 It is a schematic diagram of the structure of another sinking platform provided in this embodiment. The edge of the sinking platform 204 can also be set as a chamfered C angle, and the manufacturing of the sinking platform 204 can also be realized.

[0152] In some embodiments, see Fig.10 , Fig.15 Before being recessed, the shell 11 includes a flared section 301, which is recessed to form a support portion 1112, and the flared section 301 presents a flared design with a gradually increasing inner diameter in the direction from the main body 112 of the shell 11 to the support portion 1112 of the shell 11. The flared design makes the opening part of the shell 11 more spacious, thereby reducing the risk of friction between the battery 1 and the shell wall during assembly due to the small shell opening in the traditional shell design, so that the battery 1 can be more smoothly assembled into the interior of the shell 11 during the assembly process.

[0153] In some embodiments, see Fig.15 , the housing 11 satisfies the following condition: F1 ≥ 1 mm. Wherein, F1 is the dimension of the flared section 301 in the height direction of the battery 1. Specifically, in this embodiment, the dimension F1 of the flared section 301 in the height direction of the battery 1 is set within the above range, so that when the flared section 301 is recessed and stretched to form the support portion 1112, the thickness of the support portion 1112 will not be too thin due to F1 being too small, thereby ensuring the structural strength of the support portion 1112.

[0154] In some embodiments, see Fig.15, before the depression occurs, the shell 11 also includes a first equal diameter section 302 connected to the flared section 301, and the first equal diameter section 302 is configured to form the main body 112 of the shell 11. And the shell 11 satisfies the following conditions: F5≤20°. F5 is the angle between the extension direction of the flared section 301 and the extension direction of the first equal diameter section 302. Specifically, when the angle F5 is set within the above range, the molding difficulty of the support portion 1112 can be effectively reduced. It has been verified by experiments that when the angle of F5 is greater than 20°, the support portion 1112 is not easy to shrink during the molding process, which makes the molding process of the support portion 1112 more difficult.

[0155] In some embodiments, the housing 11 includes a main body 112, a support portion 1112, and a pressing portion 1111. The pressing portion 1111 is connected to the support portion 1112 and presses the cover plate toward the support portion 1112, thereby limiting the position of the cover plate. Before being recessed, the housing 11 includes a first equal diameter section 302, a flared section 301, and a second equal diameter section 303 connected in sequence; wherein the first equal diameter section 302 is configured to form the main body 112, the flared section 301 is recessed to form the support portion 1112, and the second equal diameter section 303 is bent to form the pressing portion 1111.

[0156] In some embodiments, see Fig.15 , the shell 11 satisfies the following condition: F2 ≥ 1mm. Among them, F2 is the size of the second equal-diameter section 303 in the height direction of the battery 1. Specifically, the second equal-diameter section 303 is bent to form the buckling portion 1111. It has been verified through experiments that in this embodiment, when the size F2 of the second equal-diameter section 303 in the height direction of the battery 1 is designed to be within the above range, after the second equal-diameter section 303 is bent to form the buckling portion 1111, the buckling portion 1111 has a larger positive projection size on the cover body, that is, the area of ​​the buckling portion 1111 that buckles the cover body is larger, so that the cover body can be fully fixed by the buckling portion 1111 and is not easy to shake or shift.

[0157] In some embodiments, the diameter of the second equal diameter section 303 is greater than the diameter of the first equal diameter section 302. Specifically, in this embodiment, the diameter of the second equal diameter section 303 is set to be greater than the diameter of the first equal diameter section 302, so that during the assembly process of the battery 1, the second equal diameter section 303 of the housing 11 can be prevented from being scratched, thereby improving the assembly efficiency of the battery 1, and also reducing the damage to the surface of the battery 1 or the inside of the housing 11 that may be caused by friction.

[0158] Further, in some embodiments, the housing 11 satisfies the following condition: F3 / F4≥0.8. Wherein, F3 is the inner diameter of the first equal diameter section 302, and F4 is the inner diameter of the second equal diameter section 303. Experimental verification shows that when the ratio of the inner diameter F3 of the first equal diameter section 302 to the inner diameter F4 of the second equal diameter section 303 is not less than 0.8, the opening size of the housing 11 can provide sufficient margin for the battery 1, so that the battery 1 can be inserted more smoothly, and the assembly process of the battery 1 is relatively smooth.

[0159] In some embodiments, see Fig.16 , a cut surface is provided at one end of the second equal diameter section 303 away from the flared section 301, and the housing 11 satisfies the following conditions: 30%≤F12 / F10≤90%, F12 is the dimension of the orthographic projection of the cut surface in the thickness direction of the second equal diameter section 303, and F10 is the thickness of the second equal diameter section 303. Specifically, it has been verified by experiments that when the ratio of F12 to F10 is less than 30%, the cut surface of the housing 11 cannot be covered by the nickel layer during the stamping process, which ultimately affects the corrosion resistance of the housing 11. When the ratio of F12 to F10 is greater than 90%, the shape of the end connected to the cut surface is relatively sharp, which makes it easy for the second equal diameter section 303 of the housing 11 to scratch other components during the assembly process.

[0160] In some embodiments, see Fig.15 , on the basis of F2 ≥ 1 mm, the housing 11 satisfies the following condition: F1 / F2 ≥ 0.5. Among them, F1 is the dimension of the expanded section 301 in the height direction of the battery 1, and F2 is the dimension of the second equal diameter section 303 in the height direction of the battery 1. Specifically, in this embodiment, the ratio of the dimension F1 of the expanded section 301 in the height direction of the battery 1 to the dimension F2 of the second equal diameter section 303 in the height direction of the battery 1 is set within the above range, in order to ensure that after the expanded section 301 is stretched to be concave to form the support portion 1112, the thickness of the support portion 1112 is relatively thick and not easily damaged.

[0161] In order to ensure the anti-corrosion effect of the shell 11, the shell 11 can be nickel-plated before the product is manufactured, or it can be nickel-plated after the product is manufactured. Among them, when the shell 11 is nickel-plated before the product is manufactured, the surface of the support part 1112 in the main body 112 is plated with a nickel layer with a thickness of 2μH to 8μH, and the surface of the base 201 and the curved part 202 is plated with a nickel layer with a thickness of 1μH to 5μH. When the shell 11 is nickel-plated after the product is manufactured, the surface of the support part 1112 in the main body 112 is plated with a nickel layer with a thickness of 0.1μH to 5μH, and the surface of the base 201 and the curved part 202 is plated with a nickel layer with a thickness of 0.5μH to 8μH. It has been verified by experiments that when the shell 11 is nickel-plated in the above manner, the anti-corrosion effect of the shell 11 is better.

[0162] The present application also provides a shell 11, which includes a main body 112 and a support portion 1112 connected to the main body 112, wherein the support portion 1112 is recessed toward the interior of the shell 11 along a first direction and includes two side walls opposite to each other in a second direction, and the second direction is perpendicular to the first direction. The shell 11 satisfies the following conditions: 0<H9≤0.05*H; wherein E1 is the minimum spacing between the two side walls, and H is the height of the battery 1. The support portion 1112 in the shell 11 provided by the present invention can deform during the process of increasing the internal pressure of the battery 1 to increase the space inside the battery 1, thereby effectively delaying the triggering timing of the explosion-proof valve when releasing the pressure inside the battery, so as to prevent the explosion-proof valve from being prematurely broken due to the excessive pressure it is subjected to in an instant.

[0163] In some embodiments, please refer to Fig.10 , the shell assembly meets the following conditions: 0.1mm≤E7-E8≤5mm. Among them, E7 is the inner diameter of the contact surface between the first seal and the cover plate, and E8 is the inner diameter of the orthographic projection of the support portion 1112 of the shell 11 on the cover plate. Specifically, it has been verified by experiments that when the difference between the inner diameter E8 of the orthographic projection of the support portion 1112 of the shell 11 on the cover plate and the inner diameter E7 of the contact surface between the first seal and the cover plate is greater than 5mm, due to the large size of the contact portion between the first seal and the cover plate, it is not convenient to position the cover plate during the assembly process, which causes the cover plate to easily shift. When the difference between the inner diameter E8 of the orthographic projection of the body support portion 1112 on the cover plate and the inner diameter E7 of the contact surface between the first seal and the cover plate is less than 0.1mm, due to the small size of the contact portion between the first seal and the cover plate, it will cause the cover plate to be inconvenient to assemble.

[0164] In some embodiments, Fig.17As shown, the battery 1 includes a cell assembly 30 and an insulating tape 40. The cell assembly 30 is located in the housing 11, and the insulating tape 40 is arranged between the side surface of the cell assembly 30 and the side wall of the housing 11. That is, the insulating tape 40 is used to isolate the side wall of the housing 11 from at least part of the structure in the cell assembly 30, so as to meet the insulation design requirements between at least part of the structure in the cell assembly 30 and the side wall of the housing 11.

[0165] Among them, Fig.18 As shown, the insulating tape 40 forms a folding area on the side of the battery cell assembly 30 facing the shell 11, that is, when the insulating tape 40 is set on the side surface of the battery cell assembly 30, in order to ensure the stability of the setting of the insulating tape 40 on the side surface of the battery cell assembly 30, the insulating tape 40 can be partially folded to the side of the battery cell assembly 30 facing the shell 11, and the folded insulating tape 40 needs to be flattened after folding. At this time, the insulating tape 40 will form a folding area on the side of the battery cell assembly 30 facing the shell 11, and the setting of the folding area can form an electrolyte flow channel, so that the electrolyte can flow along the folding area to the battery cell assembly 30, thereby helping to improve the wetting effect of the battery cell assembly 30, and then helping to improve the overall performance of the battery 1.

[0166] In some embodiments, Fig.18 and 19 As shown, the battery 1 includes a terminal assembly 20, which is insulated and connected to one end of the shell 11 away from the cover assembly 12, and the battery cell assembly 30 includes a positive current collecting plate 31 (current collecting plate 35), and the negative current collecting plate 32 (current collecting plate 35) is electrically connected to the terminal assembly 20, that is, the terminal assembly 20 and the shell 11 serve as the two poles of the battery 1 respectively, and the positive current collecting plate 31 and the terminal assembly 20 are the same pole of the battery 1.

[0167] Among them, the insulating tape 40 is arranged between the side surface of the positive current collecting disk 31 and the side wall of the shell 11 to insulate the positive current collecting disk 31 from the side wall of the shell 11. At the same time, the insulating tape 40 forms a folding area on the side of the positive current collecting disk 31 facing the terminal assembly 20, so that the electrolyte can flow along the folding area to the winding core 33 connected to the positive current collecting disk 31, thereby helping to improve the wetting effect of the winding core 33, and then improve the overall performance of the battery 1.

[0168] Among them, the insulating tape 40 forms a plurality of folding areas on the side of the positive electrode current collecting disk 31 facing the terminal assembly 20, and the plurality of folding areas are arranged at equal intervals along the circumference of the positive electrode current collecting disk 31, so that the electrolyte can flow evenly along the plurality of folding areas in the circumference of the positive electrode current collecting disk 31, thereby helping to improve the wetting uniformity of the winding core 33, and further improve the overall performance of the battery 1.

[0169] Reference Figures 17 to 20As shown, the present application provides a battery, including a shell 11, a terminal assembly 20, a winding core 33, a collecting disk 35 and an insulating tape 40; the terminal assembly 20 is arranged in the shell; the winding core 33 is arranged in the shell; the collecting disk 35 is arranged in the shell, including a protrusion 351 and a disk body 352 arranged around the protrusion 351, along the axial direction of the battery 1, the protrusion 351 protrudes from the disk body 352, the protrusion 351 is connected to the terminal assembly 20, and the side of the disk body 352 away from the terminal assembly 20 is connected to the winding core 33; wherein, along the axial direction of the battery 1, the height of the protrusion 351 is M1, the thickness of the disk body 352 is M2, and M1≤2M2.

[0170] In the embodiment of the present application, the current collecting disk 35 includes a disk body 352 and a protrusion 351 protruding from the disk body 352, and the protrusion 351 is connected to the terminal assembly 20, which can not only ensure the connection between the current collecting disk 35 and the terminal assembly 20, prevent the phenomenon of cold welding and fried welding during the welding process of the current collecting disk 35 and the terminal assembly 20, but also ensure the connection area between the current collecting disk 35 and the terminal assembly 20, and realize the effective welding between the current collecting disk 35 and the terminal assembly 20, thereby meeting the overcurrent requirement of the battery 1; at the same time, through the setting of the protrusion 351, the overall thickness of the disk body 352 part will not be increased, avoiding affecting the internal space of the battery 1 shell to realize the effective welding between the current collecting disk 35 and the terminal assembly 20, thereby meeting the overcurrent requirement of the battery 1. In addition, the parameter setting of M1≤2M2 can ensure the contact between the protrusion 351 and the terminal assembly 20, and will not make the height of the protrusion 351 too large, further avoiding affecting the internal space of the battery 1 shell.

[0171] In some embodiments, reference Fig.17 As shown, in order to ensure the insulation between the outer circumference of the collecting disk 35 and the inner side wall of the shell, an insulating tape 40 is also included to insulate between the disk body 352 and the inner side wall of the shell.

[0172] In some embodiments, the thickness of the insulating tape 40 is M3, M3≤M1≤2(M2+M3). Therefore, when the collecting plate 35 is affixed with the insulating tape 40, the height of the protrusion 351 can also protrude from the surface of the insulating tape 40, thereby ensuring the connection between the protrusion 351 and the terminal assembly 20.

[0173] In this embodiment, reference Fig. 20As shown, the protrusion 351 is located in the middle of the disk body 352 and is connected to the terminal assembly 20 through the middle position, which can better ensure the connection between the protrusion 351 of the collecting disk 35 and the terminal assembly 20, and realize effective welding between the protrusion 351 and the terminal assembly 20, thereby ensuring that the connection between the collecting disk 35 and the terminal assembly 20 can meet the overcurrent requirements of the battery 1 and ensure the normal use of the battery 1.

[0174] In some embodiments, reference Fig.21 As shown, the protrusion 351 is provided with a third through hole 353, and the terminal assembly 20 is provided with a first groove 212. The third through hole 353 and the first groove 212 are arranged opposite to each other and are interconnected. The arrangement of the third through hole 353 and the first groove 212 can facilitate the electrolyte injection process and ensure that the electrolyte can flow smoothly into the battery 1; at the same time, the third through hole 353 and the first groove 212 are arranged opposite to each other, thereby ensuring the accuracy of the electrolyte injection process, ensuring that the electrolyte can flow smoothly into the battery 1, and ensuring the use effect of the battery 1.

[0175] In some embodiments, the aperture of the third through hole 353 is M4, and the aperture of the first groove 212 is M5, M4 ≥ M5. That is, the aperture of the third through hole 353 provided on the current collecting plate 35 is not less than the first groove 212 provided on the terminal assembly 20; after the battery 1 is assembled, along the axial direction of the battery 1, the terminal assembly 20 is located in the shell and close to the opening side of the shell, and the current collecting plate 35 is located in the shell and away from the opening side of the shell. Therefore, the aperture of the third through hole 353 away from the opening side is not less than the first groove 212 close to the opening side, which can ensure that the electrolyte can flow smoothly into the winding core 33, so that the winding core 33 is fully infiltrated, avoiding leakage of the electrolyte, and ensuring the normal use requirements of the battery 1.

[0176] In some embodiments, the terminal assembly 20 includes a pressure ring 25 and a pole 21 , the pole 21 is connected to the protrusion 351 , the pressure ring 25 is arranged around the outer circumference of the pole 21 , and the first groove 212 is arranged on the pole 21 .

[0177] It should also be noted that the reference Fig.19 As shown, in this embodiment, the pressure ring 25 is arranged on the side of the pole 21 close to the collecting plate 35, so as to press the pole 21 to the surface of the convex bump, thereby ensuring that the pole 21 can fully contact the convex bump, thereby ensuring the connection between the pole 21 and the convex bump, and avoiding the phenomenon of fried welding or cold welding between the collecting plate 35 and the terminal assembly 20.

[0178] In some embodiments, the maximum outer diameter of the protrusion 351 is M6, the inner diameter of the first groove 212 on the side close to the current collecting plate 35 is M7, the maximum outer diameter of the pressure ring 25 is M8, and M8≥M6≥M7. Accordingly, the maximum outer diameter of the protrusion 351 is greater than the inner diameter of the first groove 212, which can ensure the contact area between the current collecting plate 35 and the connecting terminal assembly 20, thereby ensuring the connection between the current collecting plate 35 and the terminal assembly 20. At the same time, the maximum outer diameter of the protrusion 351 does not exceed the maximum outer diameter of the pressure ring 25, which reserves more air chamber space in the shell and reduces the internal pressure of the shell.

[0179] In some embodiments, the diameter of the disk 352 is M9, and the maximum outer diameter of the winding core 33 is M 10 ,M9≤M 10 Therefore, by setting the above parameters, the assembly of the collecting plate 35 and the winding core 33 can be facilitated, while also ensuring the performance of the winding core 33, avoiding the failure to meet the overcurrent requirements of the battery 1 due to the small size of the winding core 33, and ensuring the normal use of the battery 1.

[0180] In some embodiments, the surface area of ​​the disk 352 is M 11 The area of ​​the end surface 331 of the winding core 33 along the radial direction is M 12 , M 11 ≥70%M 12 Therefore, by setting the above parameters, the assembly of the collecting plate 35 and the winding core 33 can be facilitated, while also ensuring the performance of the winding core 33, avoiding the failure to meet the overcurrent requirements of the battery 1 due to the small connection area of ​​the winding core 33, and ensuring the normal use of the battery 1.

[0181] In some embodiments, the thickness M2 of the plate 352 is set between 0.2 mm and 2 mm. By setting the above parameters, the thickness of the plate 352 can be moderate, avoiding interference with the original internal space of the battery 1, and meeting the assembly space requirements of the battery 1. At the same time, the molding process of the plate 352 is also facilitated.

[0182] In some embodiments, in order to avoid short circuit between the collecting disk 35 and the inner side wall of the shell, the winding core 33 includes two end faces 331 arranged opposite to each other and a side face 332 connecting the two end faces 331, one end of the insulating tape 40 is attached to the side face 332 of the winding core 33, and the other end of the insulating tape 40 is attached to the side of the disk body 352 away from the winding core 33.

[0183] In some embodiments, reference Fig. 22As shown, the insulating tape 40 located in the transition area between the core 33 and the disk 352 forms a flow channel 34 for the electrolyte to pass through. In the specific assembly process, the insulating tape 40 is flattened, and a gap is formed in the transition area between the core 33 and the disk 352. In this area, the insulating tape 40 does not have a perfect sealing effect, so it can form a flow channel 34 for the electrolyte, thereby driving the electrolyte to flow to this area; thus, when the electrolyte permeates out, this area can become an effective communication channel, facilitating the flow of the electrolyte between the positive and negative electrodes of the battery 1, and ensuring the electrical performance of the core 33; at the same time, the electrolyte outside the core 33 can also be easily circulated back from the channel into the core 33, thereby ensuring that the battery 1 can smoothly realize the charging and discharging process and ensure the normal use of the battery 1.

[0184] It can be understood that since the diameter of the collecting disk 35 is smaller than the diameter of the winding core 33, a step can be formed on the transition area between the collecting disk 35 and the winding core 33. When the insulating tape 40 is attached to this area, the insulating tape 40 cannot fit perfectly and does not have a perfect sealing effect, thus forming an effective communication channel for the electrolyte.

[0185] In some embodiments, along the radial direction of the winding core 33, the width of the circulation channel 34 is M. 13 , M 13 ≤40%M 10 In this embodiment, the width M of the circulation channel 34 is 13 Therefore, it is possible to prevent the width of the circulation channel 34 from being too large, avoid a large diameter difference between the winding core 33 and the disk 352, and prevent the tape from being unable to be flattened and attached to the disk 352 and the winding core 33, thereby ensuring that the insulating tape 40 can be firmly attached to the winding core 33 and the disk 352, and achieve the insulating effect of the insulating tape 40.

[0186] In some embodiments, the height of the winding core 33 is M 14 , along the axial direction of the winding core 33, the height of the insulating tape 40 attached to the side surface 332 of the winding core 33 is M 15 , M 14 >M 15 In this embodiment, the length of the insulating tape 40 attached to the side surface 332 of the winding core 33 is greater than 3 mm, but it does not completely cover the side surface 332 of the entire winding core 33, which can ensure that the insulating tape 40 can be firmly attached to the side surface 332 of the winding core 33, and the height of the insulating tape 40 attached to the winding core 33 will not be too large, thereby avoiding waste of the insulating tape 40.

[0187] In addition, the insulating tape 40 does not cover the entire side surface 332 of the winding core 33, which can also prevent the insulating tape 40 from occupying too much internal space in the shell and avoid reducing the air chamber space in the shell, thereby reducing the pressure inside the shell.

[0188] In some embodiments, the insulating tape 40 is arranged along the circumference of the winding core 33, and along the circumference of the winding core 33, the two ends of the insulating tape 40 are enclosed to form an overlapping area. In the specific gluing process, the insulating tape 40 needs to be pasted along the current collecting disk 35 and the winding core 33 in a full circle, and the two ends of the insulating tape 40 are enclosed to form an overlapping area, so that it can be avoided that there is a place where the outer periphery of the current collecting disk 35 or the winding core 33 is not properly pasted, and the overlapping area at both ends of the insulating tape 40 can also ensure the connection stability of the insulating tape 40, avoid the detachment of the tape, and ensure the insulation effect of the insulating tape 40.

[0189] In some embodiments, along the circumference of the winding core 33, the width of the overlapping area is M. 16 , 20%M9>M 16 >1mm.

[0190] In some embodiments, along the radial direction of the disk body 352, the width of the insulating tape 40 attached to the disk body 352 is M. 16 , 20%M9>M 16 In this embodiment, the width M of the insulating tape 40 attached to the plate 352 is 16 The width of the insulating tape 40 on one side of the disk body 352 away from the winding core 33 is larger than 1.5 mm, but does not exceed 20% of the diameter of the entire disk body 352, which can ensure that the insulating tape 40 can be firmly attached to the side of the collecting disk 35 away from the winding core 33, and will not make the width of the insulating tape 40 attached to the disk body 352 too large, thereby preventing the working performance of the disk body 352 from being affected and avoiding waste of the insulating tape 40.

[0191] In addition, the insulating tape 40 does not cover the entire disk body 352, which can also prevent the insulating tape 40 from occupying too much internal space in the shell and avoid reducing the air chamber space in the shell, thereby reducing the pressure inside the shell.

[0192] In some embodiments, reference Fig.18 As shown, the insulating tape 40 includes a first area 401 connected to the side of the disk 352 away from the winding core 33 and a second area 402 connected to the side 332 of the winding core 33. The maximum diameter of the first area 401 is M 16 , the maximum diameter of the second region 402 is M 17 , 50%M 17 ≤M 16≤95%M 17 Through the above arrangement, the width range of the flow channel 34 can be prevented from being too large, thereby ensuring that the insulating tape 40 can be smoothly attached to the winding core 33 and the collecting plate 35 after being flattened, thereby ensuring the insulating effect of the insulating tape 40.

[0193] In some embodiments, the distance between the bottom surface of the insulating tape 40 away from the disk 352 and the bottom surface of the second area 402 is M. 17 The distance between the bottom surface of the insulating tape 40 away from the disk 352 and the bottom surface of the winding core 33 away from the disk 352 is M. 18 , 1%M 18 ≤M 17 ≤60%M 18 In this embodiment, the insulating tape 40 does not need to be on the entire side 332 of the winding core 33, so as to avoid wasting the insulating tape 40 and prevent the insulating tape 40 from occupying too much internal space of the shell, thereby avoiding reducing the air chamber space in the shell due to the insulating tape 40, thereby ensuring the safety of the battery 1.

[0194] In some embodiments, a battery further includes a first insulating member 50, which is disposed on a side of the disk body 352 away from the winding core 33, so as to achieve insulation between the disk body 352 and the shell. The first insulating member 50 can ensure insulation between the surface of the current collecting disk 35 and the shell, and cooperates with the insulating tape 40 to prevent short circuits between various parts of the current collecting disk 35 and the shell, thereby ensuring normal use of the battery 1.

[0195] In some embodiments, reference Fig.19 and Fig.21 As shown, the diameter of the first insulating member 50 is M 19 , along the radial direction of the winding core 33, the thickness of the insulating tape 40 in the second region 402 is M 20 , M 19 >M 10 +2M 20 That is to say, in this embodiment, the diameter of the first insulating member 50 is larger than the overall diameter of the winding core 33 after gluing, so the overall insulation performance of the first insulating member 50 can be guaranteed, thereby ensuring the insulation effectiveness of the first insulating member 50 .

[0196] like Fig.24 and Fig.25As shown, the battery 1 also includes a first insulating member 50, which is located in the shell 11. The first insulating member 50 is located on the side of the battery cell assembly 30 facing one end of the shell 11, that is, the first insulating member 50 is used to isolate the end of the shell 11 from at least part of the structure in the battery cell assembly 30, so as to meet the insulation design requirements between at least part of the structure in the battery cell assembly 30 and the end of the shell 11.

[0197] Among them, a notch 506 is opened on the side surface of the first insulating member 50, and the notch 506 penetrates the first insulating member 50 along the thickness direction of the first insulating member 50, that is, a notch structure is formed on the side surface of the first insulating member 50, so that when the first insulating member 50 is assembled into the shell, the first insulating member 50 can be deformed at the notch 506, thereby facilitating the smooth insertion of the first insulating member 50 into the shell.

[0198] In some embodiments, a plurality of notches 506 are provided on the side surface of the first insulating member 50, and the plurality of notches 506 are arranged along the circumference of the first insulating member 50, that is, when the first insulating member 50 is assembled into the shell, the first insulating member 50 can be deformed at multiple positions in the circumferential direction, thereby further facilitating the smooth insertion of the first insulating member 50 into the shell.

[0199] The plurality of notches 506 are evenly spaced along the circumference of the first insulating member 50, that is, when the first insulating member 50 is deformed during the insertion into the shell, the stress generated can be evenly distributed along the circumference of the first insulating member 50, thereby helping to improve the stability of the structure of the first insulating member 50 during the insertion into the shell. In this embodiment, four notches 506 are provided, and the four notches 506 are evenly spaced to better ensure the installation effect.

[0200] The angle formed by the side wall of the notch 506 and the bottom surface of the notch 506 is an acute angle or a right angle (≤90°). The side wall of the notch 506 refers to two side walls of the notch 506 that are arranged opposite to each other along the circumference of the first insulating member 50, and the bottom surface of the notch 506 refers to the surface connected between the two side walls. By setting the angle formed by the side wall of the notch 506 and the bottom surface of the notch 506 to ≤90°, the first insulating member 50 is more likely to be squeezed or pulled and deformed at the position of the notch 506 during the process of entering the shell, thereby facilitating the smooth entry of the first insulating member 50 into the shell.

[0201] It should also be noted that, in this embodiment, the arc length of the side of the notch 506 away from the collecting plate 35 is smaller than the arc length of the side close to the collecting plate 35, which can ensure that the notch 506 can provide deformation space for the first insulating member 50, facilitating the assembly of the first insulating member 50 into the shell.

[0202] In some embodiments, the arc length of the notch 506 close to the collecting plate 35 is M. 29 , 0.1mm≤M29 ≤10mm. By setting the above parameters, it is possible to ensure that the deformation space is sufficient while avoiding the insulation effect being affected by the gap 506 being too large.

[0203] Reference Figure 23 to Figure 25 As shown, the battery 1 includes a housing 11, a current collecting plate 35 and a first insulating member 50; the current collecting plate 35 is disposed in the housing 11; along the axial direction of the battery 1, the first insulating member 50 is connected between the current collecting plate 35 and the housing 11, and a third groove 501 is provided on the side of the first insulating member 50 facing the current collecting plate 35. The volume of the third groove 501 is M 21 , the maximum thickness of the first insulating member 50 is M 22 , the bottom area of ​​the first insulating member 50 is M 23 , M 21 ≥10%×M 22 ×M 23 .

[0204] Since the first insulating member 50 is installed between the collecting plate 35 and the shell 11, and the third groove 501 is provided on the side of the first insulating member 50 facing the collecting plate 35, therefore, by setting the third groove 501, an air chamber space can be reserved inside the shell 11, so that expansion space can be reserved for the winding core inside the shell 11, thereby ensuring the safe use of the battery 1; at the same time, the volume of the reserved third groove 501 is not less than 10% of the volume of the space occupied by the first insulating member 50. According to the ideal gas state equation, PV=NRT, so reserving a certain volume inside the shell 11 can reduce the internal pressure of the shell 11, thereby ensuring the safe use of the battery 1; in addition, by setting the third groove 501 on the first insulating member 50, a part of the internal space of the shell 11 can be reserved without affecting the original volume of the shell 11, thereby avoiding the interior of the shell 11 being completely filled with solid objects, further ensuring the safety of the battery 1, and reducing the overall weight of the battery 1, meeting the lightweight design requirements of the battery 1.

[0205] It can be understood that the ideal gas state equation is PV = NRT, where: P is pressure (Pa), V is gas volume (m 3 ), T is temperature (K), n is the amount of substance in the gas (mol), and R is the molar gas constant (also called the universal gas constant) (J / (mol.K)). It can be seen that when the gas volume V is inversely proportional to the pressure P, the larger the gas volume V, the smaller the pressure P; therefore, providing the third groove 501 on the first insulating member 50 can increase the gas volume space inside the shell 11, that is, it can reduce the pressure inside the shell 11, thereby ensuring the safe use of the battery 1.

[0206] It should also be noted that, during the specific assembly process, in order to further ensure the insulation effect between the collecting plate 35 and the inner side wall of the shell 11, a glue treatment can also be performed between the collecting plate 35 and the shell 11 to cooperate with the first insulating member 50 to ensure the insulation between the collecting plate 35 and the shell 11.

[0207] In some embodiments, the depth of the third groove 501 is M 24 The distance between the bottom wall of the third groove 501 and the side of the first insulating member 50 away from the current collecting plate 35 is M 25 , where M 25 =M 22 -M 24 , 0.3mm≤M 25 ≤80%M 22 In this embodiment, the distance between the bottom wall of the third groove 501 and the side of the first insulating member 50 away from the current collecting plate 35 is the remaining thickness of the first insulating member 50 after the third groove 501 is dug out, and the remaining thickness of the first insulating member 50 after the third groove 501 is dug out is not less than 0.3 mm, but also not more than 80% of the overall thickness of the first insulating member 50, that is, it can ensure that the depth of the opened third groove 501 is sufficient, and the strength of the first insulating member 50 can be ensured, so as to prevent the first insulating member 50 from breaking during assembly or use due to too small remaining thickness, thereby ensuring the normal use of the battery 1.

[0208] In some embodiments, reference Fig.25 and Fig.26 As shown, the first insulating member 50 is provided with an inner ring reinforcing rib 502 and an outer ring reinforcing rib 503 on the side facing the collecting plate 35, the inner ring reinforcing rib 502 and the outer ring reinforcing rib 503 are arranged at intervals, and the third groove 501 is located between the inner ring reinforcing rib 502 and the outer ring reinforcing rib 503. By providing the inner ring reinforcing rib 502 and the outer ring reinforcing rib 503, the problem of reducing the overall strength of the first insulating member 50 due to the third groove 501 being provided on the first insulating member 50 is avoided, that is, the overall strength of the first insulating member 50 can be ensured, and the normal use of the first insulating member 50 can be ensured.

[0209] In some embodiments, in order to further ensure the strength of the first insulating member 50 , the inner ring reinforcement rib 502 and the outer ring reinforcement rib 503 are connected by a connecting reinforcement rib 504 .

[0210] In some embodiments, reference Fig.25 and Fig.26As shown, a plurality of connecting reinforcing ribs 504 are provided, and the plurality of connecting reinforcing ribs 504 are arranged at intervals along the circumferential direction of the first insulating member 50, and can divide the third groove 501 into a plurality of parts. Thus, the strength of each part of the first insulating member 50 can be made uniform, and the connecting reinforcing ribs 504 connect the inner ring reinforcing ribs 502 and the outer ring reinforcing ribs 503, which can improve the strength of the inner ring reinforcing ribs 502 and the outer ring reinforcing ribs 503, thereby ensuring the strength of the first insulating member 50.

[0211] It can be understood that in this embodiment, there are eight connecting reinforcement ribs 504 shown, and the eight connecting reinforcement ribs 504 are evenly spaced along the circumference of the first insulating member 50; and in order to ensure the connection strength between the inner ring reinforcement ribs 502 and the outer ring reinforcement ribs 503, in the specific setting, the number of the connecting reinforcement ribs 504 should be set to no less than four.

[0212] In some embodiments, reference Fig.25 and Fig.26 As shown, the outer ring reinforcement rib 503 is sleeved on the outer periphery of the inner ring reinforcement rib 502, and the distance between the inner ring reinforcement rib 502 and the outer ring reinforcement rib 503 is M. 26 , the maximum outer diameter of the first insulating member 50 is M 27 , 30%M 27 ≤M 26 ≤70%M 27 Thus, the distance between the inner ring reinforcement rib 502 and the outer ring reinforcement rib 503 is moderate, so as to avoid the reinforcement effect being affected by the excessive distance between the inner ring reinforcement rib 502 and the outer ring reinforcement rib 503 .

[0213] In some embodiments, along the axial direction of the first insulating member 50, the thickness of the inner ring reinforcement rib 502, the outer ring reinforcement rib 503 and the connecting reinforcement rib 504 are all M 28 , where M 22 ≥M 28 ≥0.5M 25 In this embodiment, the thickness of the inner ring reinforcement rib 502, the outer ring reinforcement rib 503 and the connecting reinforcement rib 504 is not less than half of the remaining thickness of the first insulating member 50 after removing the third groove 501, which can ensure that the thickness of the inner ring reinforcement rib 502, the outer ring reinforcement rib 503 and the connecting reinforcement rib 504 is sufficient to achieve a reinforcement effect, thereby ensuring the normal use of the first insulating member 50.

[0214] In some embodiments, reference Fig. 27As shown, the circumferential outer edge of the first insulating member 50 is provided with a transition slope 505 which gradually slopes from the side away from the current collecting plate 35 toward the side close to the current collecting plate 35 and toward the housing 11. During the assembly process of the battery 1, in order to ensure the insulation effect, the diameter of the first insulating member 50 is usually slightly different from the inner diameter of the inner side wall of the housing 11. Therefore, by providing the transition slope 505 on the outer periphery of the first insulating member 50, that is, providing a chamfer on the outer periphery of the first insulating member 50, the assembly process of the diameter of the first insulating member 50 and the housing 11 can be smoothly realized, and the installation is convenient.

[0215] In some embodiments, reference Fig.23 As shown, along the axial direction of the first insulating member 50, the outer side surface of the transition slope 505 is set to be an arc shape, and the radius of the transition slope 505 is M 26 , M 22 ≥M 26 ≥0.5M 22 That is, the outer periphery of the first insulating member 50 is provided with a rounded corner, which not only facilitates the first insulating member 50 to be assembled into the housing 11, but also, through the setting of the above parameters, can avoid the radius of the rounded corner being too large, thereby preventing the gap between the circumferential outer edge of the first insulating member 50 and the housing 11 from being too large, and ensuring that the first insulating member 50 can play an insulating effect.

[0216] In some embodiments, along the axial direction of the first insulating member 50, the height of the transition slope 505 is M. 27 , M 22 ≥M 27 ≥0.5M 22 , the width of the transition slope 505 is M 28 , 4mm≥M 28 ≥0.3mm. That is, the outer periphery of the first insulating member 50 is provided with a chamfered C angle, which not only facilitates the first insulating member 50 to be assembled into the housing 11, but also, through the setting of the above parameters, can avoid the size of the chamfered C angle being too large, thereby preventing the gap between the circumferential outer edge of the first insulating member 50 and the housing 11 from being too large, and ensuring that the first insulating member 50 can play an insulating effect.

[0217] In some embodiments, a winding core is further included. The winding core is located on a side of the first insulating member 50 close to the current collecting disk. The diameter of the winding core is M 30 , the inner diameter of the housing 11 is M 31 , the maximum diameter of the first insulating member 50 is M 32 , M 30 <M 32 <M 31 In this embodiment, the diameter of the first insulating member 50 is set between the diameter of the winding core and the inner diameter of the shell 11, which can ensure that the first insulating member 50 can play an insulating effect between the collecting plate 35 and the shell 11, and can also facilitate the first insulating member 50 to be assembled into the shell 11.

[0218] In some embodiments, in order to facilitate assembly, a second opening 114 is provided on one side of the housing 11 , a fourth through hole 507 is provided on the first insulating member 50 , and the second opening 114 is opposite to the fourth through hole 507 .

[0219] In some embodiments, the diameter of the fourth through hole 507 is M. 33 , along the radial direction of the housing 11, the diameter of the second opening 114 is M 34 , M 33 ≥M 34 In the specific assembly process, after the current collecting plate 35 is connected to the terminal, the first insulating member 50 is used to achieve insulation between the current collecting plate 35 and the housing 11. At the same time, in order to ensure the insulation effect, a plastic member is also provided between the housing 11 and the first insulating member 50; therefore, the diameter of the fourth through hole 507 is smaller than the diameter of the opening, which can provide space for assembling the plastic member to further ensure the insulation effect.

[0220] It should also be noted that, in this embodiment, the minimum spacing between the inner ring reinforcement rib 502 and the fourth through hole 507 is between 0.5 mm and 6 mm, which is convenient for injection molding and avoids the spacing between the inner ring reinforcement rib 502 and the fourth through hole 507 being too small, thereby ensuring the reinforcement effect.

[0221] Please refer to Figure 28-Figure 29 , Fig.28 The structure of the collecting plate 35 provided in the embodiment of the present application is shown in FIG. Figure 1 , Fig.29 yes Fig.28 The enlarged schematic diagram of the local A shown in the figure. The present application provides a battery 1, the battery 1 includes a shell, a winding core 33 and a current collecting disk 35, the shell is provided with a containing chamber, the winding core 33 is provided in the containing chamber, the current collecting disk 35 is welded to the winding core 33, the winding core 33 includes an end face facing the current collecting disk 35, and the welding area between the end face and the current collecting disk 35 accounts for 10%-90% of the end face area, that is, the welding area between the end face and the current collecting disk 35 is greater than or equal to 10% of the end face area and less than or equal to 90% of the end face area.

[0222] Specifically, the welding area of ​​the core 33 of the battery 1 refers to the area on the end surface of the core 33 where the collector plate 35 can be welded safely and effectively. The design of the battery 1 determines the shape, size and position of the core 33, which affects the size and shape of the welding area. The size of the welding area directly affects the firmness of the welding, the reliability of the electrical connection and the current carrying capacity of the battery 1. If the welding area is too large or too small, it may cause the battery 1 to malfunction during use, or even cause a safety accident.

[0223] Specifically, if the welding area is insufficient, the strength of the welding point may be insufficient. When the battery 1 is subjected to external impact or vibration, the welding point is easy to fall off or break, thereby causing problems such as short circuit or open circuit in the battery 1. However, since a central hole is formed in the middle of the winding core 33 after winding, and wrinkles are formed at the edge of the winding core 33, the middle area and the outermost area of ​​the winding core 33 cannot be directly welded to the collecting plate 35, and the upper limit of the welding area is limited.

[0224] The present application provides a battery 1, which includes a winding core 33, and the welding area between the end face of the winding core 33 and the collecting plate 35 is between 10% and 90% of the end face area. On the basis of the structure of the winding core 33 itself, the effective welding area is guaranteed, which can increase the connection strength between the collecting plate 35 and the winding core 33 and improve the stability of the structural connection.

[0225] For example, the welding area between the end face of the winding core 33 and the collecting plate 35 is 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90% of the end face area, etc., and the embodiments of the present application are not limited to this.

[0226] In some embodiments, the current collecting plate 35 has a plurality of second welding areas 36, which are arranged around the center of the current collecting plate 35, and each second welding area 36 is provided with a plurality of welding lines 360 on the side facing the winding core 33. The welding lines 360 are welding tracks between the current collecting plate 35 and the winding core 33, and the second welding areas 36 are arranged around the center of the current collecting plate 35, which can better adapt to the end surface shape of the winding core 33 and increase the welding area between the end surfaces of the current collecting plate 35 and the winding core 33.

[0227] In some embodiments, the radius length of the current collecting plate 35 is R, and the length of at least one welding line 360 ​​is greater than or equal to 0.05 R. For example, if the radius length R of the current collecting plate 35 is 20 mm, then the length of at least one welding line 360 ​​is greater than or equal to 1 mm, which is not limited in the present embodiment.

[0228] In some embodiments, the length of at least one welding line 360 ​​is greater than or equal to 3 mm, such as 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, etc. If the welding line 360 ​​is shorter, multiple weldings are required, and multiple intermittent weldings will affect the welding efficiency. Increasing the welding length can ensure the continuity of the welding.

[0229] In some embodiments, the line width of each welding wire 360 ​​is greater than or equal to 0.05 mm, such as 0.06 mm, 0.07 mm, 0.08 mm, 0.08 mm, 0.09 mm, etc., which is not limited in the embodiments of the present application.

[0230] In some embodiments, the weld width of each welding wire 360 ​​is greater than or equal to 0.1 mm, such as 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, etc., which is not limited in the embodiments of the present application.

[0231] In some embodiments, each welding wire 360 ​​includes at least one bending portion 361, and the bending portion 361 includes a first connecting segment 3611 and a second connecting segment 3612 connected to each other, and the angle between the first connecting segment 3611 and the second connecting segment 3612 is greater than or equal to 0° and less than 180°.

[0232] For example, the angle between the first connecting segment 3611 and the second connecting segment 3612 can be 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, 90°, 100°, 110°, 120°, 130°, 140°, 150°, 160°, 170°, 175°, etc., which is not limited to the embodiments of the present application.

[0233] It is understandable that the bending portion 361 can increase the welding area, and the increase in the welding area can improve the reliability and durability of welding, avoid problems such as welding cracking and falling off due to insufficient welding strength, thereby improving the fatigue resistance of welding and extending the service life of the battery 1.

[0234] In some embodiments, each welding line 360 ​​includes a plurality of bends 361 connected in sequence. It is understandable that the plurality of bends 361 are provided in sequence, which can not only ensure the welding strength, but also ensure the continuity and consistency of the welding. The angles between the first connecting section 3611 and the second connecting section 3612 of each second welding area 36 can be equal or unequal.

[0235] In some embodiments, in each bending portion 361, one end of the first connecting segment 3611 and one end of the second connecting segment 3612 are interconnected to form an endpoint, the other end of the first connecting segment 3611 and the other end of the second connecting segment 3612 are spaced apart and are both located on the same straight line, and the distance from the endpoint to the straight line is greater than or equal to 0.5 mm.

[0236] Specifically, since the welding wire 360 ​​includes multiple bending portions 361, the width of the welding wire 360 ​​is greater than the line width of the welding wire 360 ​​itself, and the first connecting segment 3611 and the second connecting segment 3612 form a triangular structure. The width of the welding wire 360 ​​is equal to the height G1 from the top of the bending portion 361 to the bottom of the bending portion 361, and G1 is greater than or equal to 0.5mm, such as 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, etc., which is not limited in this application.

[0237] In some examples, each welding wire 360 ​​includes a starting end and an ending end. When the welding wire 360 ​​is a bent structure, if the starting end and the ending end are located on the same straight line radiating outward from the center of the current collecting plate 35, the length G2 of the welding wire 360 ​​is equal to the difference between the length from the starting end to the center of the circle and the length from the ending end to the center of the circle.

[0238] If the initial end and the terminal end are located on different straight lines radiating outward from the center of the collecting plate 35, the line passing through the terminal end and the center of the collecting plate 35 is the first line, and the line passing through the terminal end and perpendicular to the first line is the second line. The length G2 of the welding line 360 ​​is equal to the distance from the initial end to the second line.

[0239] In some embodiments, each welding line 360 ​​is arranged to extend in the radial direction of the winding core 33. Specifically, each second welding area 36 includes a plurality of welding lines 360 arranged in sequence along the circumferential direction, and each welding line 360 ​​extends in the radial direction of the winding core 33. Such an arrangement can maximize the use of the space of the second welding area 36 and increase the welding area.

[0240] In some embodiments, the collecting plate 35 includes a central portion 300 and a plurality of connecting members 311, wherein the plurality of connecting members 311 are connected to the central portion 300 and extend in a radial direction of the collecting plate 35, the plurality of connecting members 311 are arranged at intervals, a second welding area 36 is provided between two adjacent connecting members 311, a first gap 321 is formed between each second welding area 36 and the central portion 300, a second gap 322 is formed between each second welding area 36 and the connecting member 311, and the first gap 321 is connected to the second gap 322.

[0241] Specifically, the first gap 321 is extended in the radial direction of the current collecting disk 35, and the second gap 322 is arranged in the circumferential direction of the current collecting disk 35, forming a hollow area surrounding part of the second welding area 36. It can be understood that chemical reactions occur inside the battery 1, such as overcharging, overheating, electrolyte decomposition, etc. Gas may be generated, and excessive accumulation of gas may cause the battery 1 to swell or explode. The hollow area can ensure that the gas generated during the use of the core 33 can be discharged from the core 33 in time to form an unobstructed exhaust channel.

[0242] In some embodiments, the current collecting plate 35 includes three connecting members 311, and the three connecting members 311 divide the current collecting plate 35 into three second welding areas 36, each of which is a fan-shaped structure. The number of connecting members 311 can also be 4, 5, 6, etc., and the number of second welding areas 36 can be 4, 5, 6, etc., which is not limited in the embodiments of the present application.

[0243] In some embodiments, each connector 311 is bent away from the protrusion of the winding core 33, and the bending can ensure effective contact between the current collecting plate 35 and the battery 1 cover, so that the battery 1 cover is charged to form cathode protection, improve the corrosion resistance of the cover, and thus ensure the safety of the cover. In addition, the protrusion can also increase the hollow area of ​​the current collecting plate 35, widen the discharge channel for gas discharged from the winding core 33, and improve the safety of the battery cell.

[0244] In some embodiments, the width of each connecting member 311 can be between 4 mm and 8 mm, such as 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, etc. Setting an appropriate width for the connecting member 311 can ensure that the protrusion of the connecting member 311 provides sufficient resilience after being pressed down.

[0245] In some embodiments, the contact area between the end surface and the current collecting plate 35 accounts for 50%-100% of the end surface area, that is, the contact area between the end surface and the current collecting plate 35 is greater than or equal to 50% of the end surface area and less than or equal to 100% of the end surface area.

[0246] It is understandable that since the collecting plate 35 is provided with a gap or a protrusion, the end face cannot be fully connected to the collecting plate 35. For example, the contact area between the end face and the collecting plate 35 can be 50%, 60%, 70%, 80%, 90%, or 100% of the end face area, which is not limited in the embodiments of the present application.

[0247] In some embodiments, in each second welding area 36, ​​the length of the welding wire 360 ​​located in the middle of the second welding area 36 is greater than the length of the welding wire 360 ​​located on both sides of the second welding area 36. It can be understood that since the welding wire 360 ​​has a certain width, if the length of the welding wire 360 ​​located on both sides of the second welding area 36 is too long, it will be welded to the edge of the second welding area 36, ​​so the length of the welding wire 360 ​​located in the middle of the second welding area 36 can be greater than the length of the welding wire 360 ​​located on both sides of the second welding area 36, ​​and the length of the welding wire 360 ​​decreases from the middle of each second welding area 36 to both sides to ensure the welding effect of each second welding area 36.

[0248] In some embodiments, the length of the welding wire 360 ​​located in the middle of the second welding area 36 is a first length, the length of the welding wires 360 located on both sides of the second welding area 36 is a second length, and the difference between the first length and the second length is greater than or equal to 0.1 mm. It can be understood that in order to ensure the consistency of the plurality of welding wires 360 in the second welding area 36, ​​the difference between the first length and the second length can be set to a smaller value.

[0249] For example, each second welding area 36 is provided with three welding wires 360, and the three welding wires 360 include a first wire body arranged in the middle and two second wire bodies arranged on both sides of the first wire body along the circumference of the collecting plate 35. The two second wire bodies have the same length, the length of the first wire body is the first length, and the length of the second wire body is the second length. The difference between the first length and the second length is greater than or equal to 0.1mm, such as 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, etc., and the embodiments of the present application do not limit this.

[0250] Please refer to Figure 30-Figure 31 , Fig.30 The structure of the collecting plate 35 provided in the embodiment of the present application is shown in FIG. Figure 2 , Fig.31 The structure of the collecting plate 35 provided in the embodiment of the present application is shown in FIG. Figure 3 In some embodiments, the current collecting disk 35 is a plane as a whole. Since no connector 311 and a gap structure are disposed in the middle of the current collecting disk 35 , the current collecting disk 35 includes a plurality of welding lines 360 disposed in a radial direction, and the length of each welding line 360 ​​may be the same.

[0251] In some embodiments, each welding line 360 ​​is a straight structure, and multiple welding lines 360 can extend straight outward along the center of the current collecting plate 35. And the extension line of each welding line 360 ​​passes through the center point of the fan-shaped structure. In order to ensure the welding quality, the lengths of the multiple welding lines 360 can be kept the same, and the width of the welding lines 360 can be increased appropriately.

[0252] In some examples, each welding wire 360 ​​includes a starting end and an ending end. When the welding wire 360 ​​is a straight structure, the length of the welding wire 360 ​​is equal to the difference between the length from the starting end to the center of the circle and the length from the ending end to the center of the circle.

[0253] Please refer to Fig.32 , Fig.32 The structure of the collecting plate 35 provided in the embodiment of the present application is shown in FIG. Figure 4 In some embodiments, a plurality of welding wires 360 are disposed around the circumference of the winding core 33. Specifically, a plurality of welding wires 360 may be disposed in each second welding area 36 in a direction away from the center of the winding core 33, each welding wire 360 ​​extends around the circumference of the winding core 33, and the plurality of welding wires 360 are cocircularly formed into a structure approximately in a circular ring.

[0254] In some examples, the welding wire 360 ​​forms an arc structure along the circumferential direction, and the length G2 of the welding wire 360 ​​is equal to the arc length corresponding to the angle between two ends of the welding wire 360 ​​.

[0255] like Fig.33As shown, the battery 1 further includes a terminal assembly 20, which is connected to one end of the housing 11 away from the cover assembly 12, and a first through hole 211 is provided on the terminal assembly 20, and the first through hole 211 can be used as a liquid injection hole to facilitate the liquid injection operation during the manufacturing process of the battery 1; or, the first through hole 211 can also be used as an exhaust hole to facilitate the exhaust of the gas generated during the formation process of the battery 1, thereby helping to improve the storage capacity of the gas generated during the use of the battery 1, and further improve the safety of the battery 1 during use. Among them, the diameter of the first through hole 211 can be set to be greater than or equal to 1mm, so as to facilitate liquid injection or exhaust.

[0256] In some embodiments, a first groove 212 is provided on a side of the terminal assembly 20 away from the housing 11, and a first through hole 211 is provided at the bottom of the first groove 212. The battery 1 further includes a cell assembly 30, which is located in the housing 11 and connected to the terminal assembly 20. By providing the first groove 212 on a side of the terminal assembly 20 away from the housing 11, the thickness of the terminal assembly 20 at the position corresponding to the first groove 212 can be reduced, thereby helping to improve the welding effect between the terminal assembly 20 and the cell assembly 30.

[0257] The bottom of the first groove 212 includes a first welding area 213 for welding with the battery cell assembly 30, and the first welding area 213 is arranged around the first through hole 211. That is, when the terminal assembly 20 and the battery cell assembly 30 are welded, annular welding can be performed along the circumference of the first through hole 211, thereby helping to reduce the influence of the setting of the first through hole 211 on the welding effect of the terminal assembly 20 and the battery cell assembly 30, and ensuring the flow capacity of the bottom of the first groove 212.

[0258] It should be noted that before welding the terminal assembly 20 and the battery cell assembly 30, the first through hole 211 can be sealed with a sealing nail to compensate for the reduction of the first welding area 213 caused by the setting of the first through hole 211. At this time, the entire bottom area of ​​the first groove 212 can be used as the first welding area 213 of the terminal assembly 20 and the battery cell assembly 30, thereby helping to ensure the welding effect of the terminal assembly 20 and the battery cell assembly 30.

[0259] In other embodiments, Fig.40 As shown, the terminal assembly 20 includes a pole 21 and a second seal 24. The pole 21 is connected to one end of the shell 11 away from the cover assembly 12, and a first groove 212 is opened on the pole 21; the second seal 24 is used to be arranged in the first groove 212 and seal the first through hole 211, and the second seal 24 is provided with a protruding abutment portion 241 on the side facing the first through hole 211, and the abutment portion 241 is used to abut with the bottom of the first groove 212.

[0260] Since a certain bulge will be generated at the bottom of the first groove 212 when the terminal assembly 20 and the cell assembly 30 are welded, when the second seal 24 is placed in the first groove 212 and welded, the second seal 24 may shake under the action of the bulge, and by convexly providing an abutting portion 241 at the bottom of the second seal 24 and abutting the abutting portion 241 against the bottom of the first groove 212, the influence of the bulge on the stability of the second seal 24 can be reduced, thereby ensuring the welding effect of the second seal 24 and the terminal assembly 20. In order to further prevent the second seal 24 from shaking during placement, the height of the abutting portion 241 can be set to be greater than or equal to 0.1 mm.

[0261] Among them, at least two abutting portions 241 are convexly provided on one side of the second seal 24 facing the first through hole 211, and the abutting portions 241 are symmetrically distributed along the radial direction of the first through hole 211, so as to further improve the stability of the second seal 24 during welding and ensure the welding effect of the second seal 24 and the terminal assembly 20. In order to avoid interference between the setting of the abutting portion 241 and the welding between the pole 21 and the battery cell assembly 30, the spacing between the two abutting portions 241 symmetrically distributed along the radial direction can be set to be larger than the first welding area 213 of the pole 21 and the battery cell assembly 30.

[0262] In some embodiments, Fig.34 As shown, the first groove 212 has an overall expansion trend, the bottom diameter N1 of the first groove 212 is set to N1≥2mm, and the opening diameter N2 of the first groove 212 on the pole 21 is set to N2≥3mm, so that the side wall of the first groove 212 is inclined, and the inclination angle γ of the side wall of the first groove 212 relative to the axial direction of the first groove 212 is ≥3°, which is conducive to the assembly and welding of the second seal 24. In addition, in order to ensure that the pole 21 has sufficient strength, the thickness of the pole 21 at the position corresponding to the first groove 212 can be set to be greater than or equal to 0.5mm.

[0263] Among them, the pole 21 includes a first connecting part 214 and a second connecting part 215 that are connected to each other. The first connecting part 214 is located on the side of the shell 11 away from the battery cell assembly 30, and the second connecting part 215 is located on the side of the shell 11 facing the battery cell assembly 30. The first connecting part 214 is used to connect to an external circuit, and the second connecting part 215 is used to connect to the battery cell assembly 30.

[0264] The terminal assembly 20 further includes a second insulating member 22 and a third insulating member 23 . The second insulating member 22 is located between the first connecting portion 214 and the housing 11 , and the third insulating member 23 is located between the second connecting portion 215 and the housing 11 , so as to achieve an insulated connection between the pole 21 and the housing 11 .

[0265] Among them, a first rib 2141 is provided on the side of the first connecting part 214 facing the second insulating part 22. When the terminal assembly 20 is assembled, the first rib 2141 can squeeze the second insulating part 22 so that the first connecting part 214 is tightly connected to the second insulating part 22, thereby improving the sealing effect of the first connecting part 214 and the second insulating part 22.

[0266] Among them, Fig.35 As shown, the width N3 of the first rib 2141 can be set to N3≥0.1mm, and the height N4 of the first rib 2141 can be set to N4≥0.05mm to ensure that the first rib 2141 and the second insulating member 22 have sufficient contact area, thereby ensuring the sealing effect of the first connecting portion 214 and the second insulating member 22.

[0267] In some embodiments, the terminal assembly 20 also includes a pressure ring 25, which is disposed between the third insulating member 23 and the second connecting portion 215. The pressure ring 25 also abuts against the first connecting portion 214 to support the first connecting portion 214 and the third insulating member 23, thereby improving the overall structural strength of the terminal assembly 20.

[0268] Among them, a second rib 253 is provided on the side of the pressure ring 25 facing the third insulating part 23. When the terminal assembly 20 is assembled, the second rib 253 can squeeze the third insulating part 23 so that the pressure ring 25 is tightly connected to the third insulating part 23, thereby improving the sealing effect of the pressure ring 25 and the third insulating part 23.

[0269] The width N5 of the second rib 253 can be set to N5≥0.1mm, and the height N6 of the second rib 253 can be set to N6≥0.05mm to ensure that the second rib 253 and the third insulating member 23 have sufficient contact area, thereby ensuring the sealing effect of the second rib 253 and the third insulating member 23.

[0270] like Fig.34 As shown, the pressure ring 25 includes a first supporting portion 251 and a second supporting portion 252 . The first supporting portion 251 is used to support the third insulating member 23 . The second supporting portion 252 abuts between the first connecting portion 214 and the second connecting portion 215 . The second supporting portion 252 is used to support the first connecting portion 214 .

[0271] Among them, the width of the overlapping part of the orthographic projection of the second support part 252 and the second connection part 215 in the axial direction of the battery 1 in the radial direction of the battery 1 is N7, the width of the non-overlapping part of the orthographic projection of the second support part 252 and the second connection part 215 in the axial direction of the battery 1 in the radial direction of the battery 1 is N8, the thickness of the first support part 251 is N9, the width of the second support part 252 in the radial direction of the battery 1 is N10, and the distance between the outer surface of the second support part 252 and the central axis of the battery 1 is N11. In order to ensure the overall structural stability of the terminal assembly 20 and the riveting stability of the pole 21 and the pressure ring 25, the above parameters can be set to N7≥0.05N8, N9≥0.3mm, N10≥0.1N11, and it can also ensure that after the second insulating member 22 and the third insulating member 23 are squeezed, the overall structure of the battery 1 is not deformed.

[0272] It should be noted that the second insulating member 22 and the third insulating member 23 in the embodiment of the present application are arranged separately, and the edge of the second insulating member 22 protrudes to the side surface of the first connecting portion 214, and a first protective portion 221 is formed on the side surface of the first connecting portion 214 for external insulation to prevent the battery 1 from being short-circuited between the terminal assembly 20 and the housing 11 after long-term use. Among them, the height N12 of the first protective portion 221 and the width N13 in the radial direction of the battery 1 satisfy the relationship N12+N13≥0.8mm;

[0273] Correspondingly, the third insulating member 23 protrudes from the side surface of the pressure ring 25 and forms a second protective portion 231. The height N14 of the second protective portion 231 and the radial width N15 of the battery 1 satisfy the relationship N14+N15≥0.8mm to avoid a short circuit between the terminal assembly 20 and the shell 11 of the battery 1 after long-term use.

[0274] The material of the second insulating member 22 includes fluororubber or soluble polytetrafluoroethylene, and the material of the third insulating member 23 includes fluororubber, soluble polytetrafluoroethylene, polypropylene or polyphenylene sulfide.

[0275] In some embodiments, Fig.36 As shown, when the second connection part 215 extends into the lower part of the end of the shell 11, the pressure ring 25 can be cancelled. At this time, the second connection part 215 can be riveted in a flipping manner, that is, the riveting part 216 of the second connection part 215 used for riveting is initially in a vertical state, and after extending into the shell 11, it is flipped to a horizontal state and riveted with the corresponding third insulating member 23.

[0276] A second groove 217 is provided on the side of the second connection portion 215 facing the battery cell assembly 30, and the second groove 217 is arranged near the edge of the riveting portion 216 to reduce the risk of cracking of the second connection portion 215 due to deformation during the flipping and riveting process. The width N16 of the second groove 217 in the radial direction of the battery 1 is ≥0.05mm, and the depth N17 of the second groove 217 is ≥0.05mm;

[0277] In addition, to ensure the riveting effect between the riveted portion 216 and the third insulating member 23 , the width N18 of the riveted portion 216 in the radial direction of the battery 1 can be set to 0.2 mm≤N18≤10 mm, and the height N19 of the riveted portion 216 can be set to 0.2 mm≤N19≤5 mm.

[0278] It should be noted that, in order to further prevent the pole 21 from being deformed or cracked after the riveted portion 216 is turned over, a pressure ring 25 (such as Fig.37 As shown), the overall structural strength of the terminal assembly 20 can be improved while controlling the riveting height.

[0279] In addition, when the connection is performed by flip riveting, the riveting portion 216 can also be set on the first connecting portion 214, and correspondingly, the second groove 217 is opened on the side of the first connecting portion 214 away from the battery cell assembly 30 (such as Fig.38 The pressure ring 25 is also disposed between the corresponding riveted portion 216 and the second insulating member 22 (as shown in FIG. Fig.39 As shown), the specific parameter settings can refer to the embodiment of setting the riveting part 216 on the second connecting part 215, which will not be repeated here.

[0280] Secondly, an embodiment of the present application provides a battery pack, which includes a battery. The specific structure of the battery refers to the above embodiment. Since the battery pack adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0281] The embodiments of the present application are introduced in detail above. Specific examples are used in this article 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 and core idea of ​​the present application. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A battery, characterized in that: include: A housing, wherein a first opening is formed at one end of the housing; a cover plate assembly connected to the housing and sealing the first opening; A first sealing member is arranged between the cover plate assembly and the shell. The first sealing member bypasses the side surface of the cover plate assembly and is sealed with the cover plate assembly and the shell. A gap is provided between the first sealing member and the side surface of the cover plate assembly.

2. The battery according to claim 1, characterized in that The shell includes a buckling portion buckled with the cover assembly, the first sealing member is located between the buckling portion and the cover assembly, and the first sealing member protrudes from the buckling portion.

3. The battery according to claim 2, characterized in that The buckling portion and the first sealing member go around the side surface of the cover assembly and buckle with opposite sides of the cover assembly, and the first sealing member at least protrudes from a portion of the buckling portion located on one side of the cover assembly.

4. The battery according to claim 1, characterized in that The cover plate assembly is provided with a pressure relief groove, which is annular in shape. The diameter D of the pressure relief groove and the diameter D1 of the cover plate assembly satisfy the relationship: 0.5D1<D<D1.

5. The battery according to claim 2, characterized in that The battery further includes a protective layer, which is at least arranged on a side of the cover plate assembly facing the shell; the thickness of the protective layer is greater than or equal to 0.5 microns and less than or equal to 10 microns.

6. The battery according to any one of claims 1 to 5, characterized in that: The battery includes a cell assembly and insulating tape, wherein the cell assembly is located in the shell, the insulating tape is arranged between the side surface of the cell assembly and the side wall of the shell, and the insulating tape forms a folding area on the side of the cell assembly facing one end of the shell.

7. The battery according to claim 6, characterized in that The battery includes a terminal assembly, which is insulated and connected to one end of the shell away from the cover assembly. The battery cell assembly includes a positive current collector disk, which is electrically connected to the terminal assembly. The insulating tape is arranged between the side surface of the positive current collector disk and the side wall of the shell, and forms the folding area on the side of the positive current collector disk facing the terminal assembly.

8. The battery according to any one of claims 1 to 5, characterized in that: The battery also includes a cell assembly and a first insulating member, the cell assembly is located in the shell, the first insulating member is located in the shell, the first insulating member is located on a side of the cell assembly facing one end of the shell, a notch is provided on a side surface of the first insulating member, and the notch penetrates the first insulating member along the thickness direction of the first insulating member.

9. The battery according to claim 8, characterized in that A plurality of the notches are formed on the side surface of the first insulating member, and the plurality of the notches are arranged along the circumference of the first insulating member.

10. The battery according to claim 9, characterized in that The plurality of notches are distributed at equal intervals along the circumference of the first insulating member.

11. The battery according to claim 8, characterized in that The angle formed by the side wall of the notch and the bottom surface of the notch is an acute angle or a right angle.

12. The battery according to any one of claims 1 to 5, characterized in that: The battery further comprises a terminal assembly, wherein the terminal assembly is connected to an end of the housing away from the cover assembly, and a first through hole is formed in the terminal assembly.

13. The battery according to claim 12, characterized in that A first groove is formed on a side of the terminal assembly facing away from the housing, and the first through hole is formed at the bottom of the first groove.

14. The battery according to claim 13, characterized in that The battery also includes a cell assembly, which is located in the shell and connected to the terminal assembly; the bottom of the first groove includes a first welding area for welding with the cell assembly, and the first welding area is arranged around the first through hole.

15. The battery according to claim 13, characterized in that The terminal assembly includes a pole and a second seal, the pole is connected to one end of the shell away from the cover plate assembly, the first groove is opened on the pole; the second seal is used to be arranged in the first groove and seal the first through hole, and the second seal is convexly provided with an abutment portion on the side facing the first through hole, and the abutment portion is used to abut against the bottom of the first groove.

16. A battery pack, characterized in that: The battery pack comprises the battery according to any one of claims 1 to 15.

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