Battery and battery pack

Abstract

The utility model 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] This application relates to the field of battery technology, specifically to a battery and a battery pack. Background Technology

[0002] With the development of battery technology, the requirements for battery safety performance are becoming increasingly stringent, and battery sealing is crucial to battery safety. Battery sealing mainly includes the sealing between the battery casing and the cover assembly. Related technologies often employ welding seals or snap-fit ​​seals. When using snap-fit ​​seals, a sealing element is placed between the casing and the cover assembly, and the seal is achieved by compressing this element. However, in these technologies, the cover assembly may deform and collapse when using snap-fit ​​seals, resulting in poor overall structural stability of the battery. Utility Model Content

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

[0004] In a first aspect, embodiments of this application provide a battery, comprising:

[0005] A housing, one end of which has a first opening;

[0006] A cover plate assembly is connected to the housing and seals the first opening;

[0007] A first seal is disposed between the cover plate assembly and the housing. The first seal bypasses the side surface of the cover plate assembly and is sealed to the cover plate assembly and the housing. A gap exists between the first seal and the side surface of the cover plate assembly.

[0008] In one embodiment, the housing includes a fastening portion that engages with the cover assembly, and the first seal is located between the fastening portion and the cover assembly, the first seal protruding from the fastening portion.

[0009] In one embodiment, the fastening portion and the first seal bypass the side surface of the cover assembly and fasten to opposite sides of the cover assembly, wherein the first seal protrudes at least from the portion of the fastening portion located on one side of the cover assembly.

[0010] In one embodiment, the cover plate assembly has a pressure relief groove, which is annular, and the diameter D of the pressure relief groove and the 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, which is disposed at least on the side of the housing facing the receiving cavity; the thickness of the protective layer is greater than or equal to 0.5 micrometers and less than or equal to 10 micrometers.

[0012] In one embodiment, the battery includes a cell assembly and insulating tape. The cell assembly is located inside the housing, and the insulating tape is disposed between the side surface of the cell assembly and the side wall of the housing. The insulating tape forms a folded area on the side of the cell assembly facing the housing.

[0013] In one embodiment, the battery includes a terminal assembly that is insulated from the end of the housing away from the cover assembly. The cell assembly includes a positive current collector that is electrically connected to the terminal assembly. Insulating tape is disposed between the side surface of the positive current collector and the side wall of the housing, and the folded area is formed on the side of the positive current collector 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 inside the housing, and the first insulating member is located inside the housing. The first insulating member is located on one side of the cell assembly facing the housing. A notch is formed on the 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, the first insulating member has a plurality of notches on its side surface, and the plurality of notches are arranged along the circumference of the first insulating member.

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

[0017] In one embodiment, the angle between the sidewall of the notch and the bottom surface of the notch is an acute angle or a right angle.

[0018] In one embodiment, the battery further includes a terminal assembly connected to the end of the housing away from the cover assembly, and the terminal assembly has a first through hole.

[0019] In one embodiment, the terminal assembly has a first groove on the side opposite to 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 located within the housing and connected to the terminal assembly; the bottom of the first groove includes a first welding area for welding to the cell assembly, the first welding area being disposed around the first through hole.

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

[0022] Secondly, embodiments of this application provide a battery pack including any of the batteries described above.

[0023] The beneficial effects of the embodiments of this application are as follows:

[0024] In embodiments of this application, the battery includes a casing, a cover assembly, and a first seal. One end of the casing has a first opening. The cover assembly is connected to the casing and seals the first opening. The first seal is disposed between the cover assembly and the casing, bypassing the side surface of the cover assembly and sealingly connecting with both the cover assembly and the casing. A gap exists between the first seal and the side surface of the cover assembly. By leaving a gap between the first seal and the side surface of the cover assembly, this application ensures that the first seal will not compress the side surface of the cover assembly during the fastening process between the cover assembly and the casing, thereby reducing the risk of deformation of the cover assembly and ensuring the overall structural stability and performance of the battery. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of a battery provided in an embodiment of this application;

[0027] Figure 2 This is a schematic diagram of the structure of the first housing assembly provided in the embodiments of this application;

[0028] Figure 3 This is a partial structural schematic diagram of the fastening area of ​​a housing and cover plate assembly provided in an embodiment of this application;

[0029] Figure 4 This is a partial structural schematic diagram of the fastening area of ​​a housing and cover plate assembly provided in an embodiment of this application;

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

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

[0032] Figure 7 This is a schematic diagram of a pressure relief groove provided in an embodiment of this application;

[0033] Figure 8 This is a schematic diagram of different types of through holes provided on a second protrusion according to an embodiment of this application;

[0034] Figure 9 This is a schematic diagram of the mating structure of a third seal and a second protrusion provided in an embodiment of this application;

[0035] Figure 10 This is a partial structural schematic diagram of a shell provided in an embodiment of this application;

[0036] Figure 11 This is provided by the embodiments of this application. Figure 10 Schematic diagram of the main body structure;

[0037] Figure 12 This is provided by the embodiments of this application. Figure 11 Enlarged view of section A;

[0038] Figure 13 This is provided by the embodiments of this application. Figure 11 Enlarged view of section B;

[0039] Figure 14 This is a schematic diagram of a sinkhole structure provided in an embodiment of this application;

[0040] Figure 15 This is a partial structural diagram of a housing with a non-recessed support portion provided in an embodiment of this application;

[0041] Figure 16 This is a schematic diagram of the end structure of the second equal-diameter section provided in an embodiment of this application;

[0042] Figure 17 This is a cross-sectional view of a battery after it has been covered with insulating tape, as provided in an embodiment of this application;

[0043] Figure 18 This is a top view of an insulating adhesive paper provided in an embodiment of this application;

[0044] Figure 19 This is a cross-sectional view of a battery provided in an embodiment of this application;

[0045] Figure 20 This is a cross-sectional view of a collector disk provided in an embodiment of this application;

[0046] Figure 21This is a cross-sectional view of a battery provided in Embodiment 2 of this application;

[0047] Figure 22 This is a schematic diagram of the flow channel provided in an embodiment of this application;

[0048] Figure 23 This is a three-dimensional schematic diagram of a battery provided in an embodiment of this application;

[0049] Figure 24 This is a perspective view of the first insulating member provided in an embodiment of this application;

[0050] Figure 25 This is a top view of the first insulating member provided in an embodiment of this application;

[0051] Figure 26 This is a cross-sectional view of the first insulating member provided in an embodiment of this application;

[0052] Figure 27 This is provided by the embodiments of this application. Figure 24 A magnified view of a section at point A in the middle;

[0053] Figure 28 This is a schematic diagram of the structure of the collector disk provided in the embodiments of this application. Figure 1 ;

[0054] Figure 29 This is provided by the embodiments of this application. Figure 28 An enlarged schematic diagram of part A shown;

[0055] Figure 30 This is a schematic diagram of the structure of the collector disk provided in the embodiments of this application. Figure 2 ;

[0056] Figure 31 This is a schematic diagram of the structure of the collector disk provided in the embodiments of this application. Figure 3 ;

[0057] Figure 32 This is a schematic diagram of the structure of the collector disk provided in the embodiments of this application. Figure 4 ;

[0058] Figure 33 This is a schematic diagram of the structure of the first type of terminal assembly provided in the embodiments of this application;

[0059] Figure 34 This is a schematic diagram of the parameters of the first type of terminal assembly provided in the embodiments of this application.

[0060] Figure 35 This is provided by the embodiments of this application. Figure 34 A magnified view of a portion of the image;

[0061] Figure 36This is a schematic diagram of the structure of a second type of terminal assembly provided in an embodiment of this application;

[0062] Figure 37 This is a schematic diagram of the structure of the third type of terminal assembly provided in the embodiments of this application;

[0063] Figure 38 This is a schematic diagram of the structure of the fourth type of terminal assembly provided in the embodiments of this application;

[0064] Figure 39 This is a schematic diagram of the structure of the fifth terminal assembly provided in the embodiments of this application;

[0065] Figure 40 This is a schematic diagram of the sixth type of terminal assembly provided in the embodiments of this application.

[0066] Explanation of reference numerals in the attached figures:

[0067] 1. Battery;

[0068] 10, Housing assembly; 11, Housing; 111, Fastening part; 1111, Clamping part; 1112, Support part; 112, Main body part; 1121, Base part; 1122, Bending part; 1123, Support part; 1124, Recessed platform; 1125, Flared 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, Recess; 125, Second protrusion; 1251, Second through hole; 126, Third seal; 1261, Transition part; 13, First seal; 131, First sealing part; 132, Second sealing part; 133, Third sealing part; 14, First air chamber; 15, Second air chamber;

[0069] 20, Terminal assembly; 21, Pole post; 211, First through hole; 212, First groove; 213, First welding area; 214, First connecting part; 2141, First rib; 215, Second connecting part; 216, Riveting part; 217, Second groove; 22, Second insulating member; 221, First protective part; 23, Third insulating member; 231, Second protective part; 24, Second sealing member; 241, Abutting part; 25, Pressure ring; 251, First support part; 252, Second support part; 253, Second rib

[0070] 30, Cell assembly; 31, Positive current collector; 32, Negative current collector; 33, Core; 331, End face; 332, Side face; 34, Flow channel; 35, Current collector; 351, Protrusion; 352, Disc body; 353, Third through hole; 36, Second welding area; 360, Weld wire; 361, Bending part; 3611, First connecting section; 3612, Second connecting section; 300, Center part; 311, Connector; 321, First gap; 322, Second gap;

[0071] 40, Insulating tape; 401, First area; 402, Second area;

[0072] 50, First insulating component; 501, Third groove; 502, Inner ring reinforcing rib; 503, Outer ring reinforcing rib; 504, Connecting reinforcing rib; 505, Transition slope; 506, Notch; 507, Fourth through hole. Detailed Implementation

[0073] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0074] First, this application provides a battery, such as... Figure 1 and Figure 2 As shown, the battery 1 includes a housing 11, and a receiving cavity is formed inside the housing 11 for accommodating the cell assembly 30. A first opening 113 is formed at one end of the housing 11 to facilitate the insertion and assembly of the cell assembly 30.

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

[0076] Battery 1 includes a first seal 13, which is disposed between cover assembly 12 and housing 11. The first seal 13 bypasses the side surface of cover assembly 12 and is sealed to both cover assembly 12 and housing 11. That is, the first seal 13 is elastic, and when cover assembly 12 and housing 11 are engaged, the first seal 13 is compressed, thereby achieving a sealed connection between cover assembly 12 and housing 11.

[0077] There is a gap between the first sealing element 13 and the side surface of the cover plate assembly 12. That is, when the first sealing element 13 passes around the cover plate assembly 12 to seal, it will maintain a certain distance from the side surface of the cover plate assembly 12. This ensures that when the cover plate assembly 12 is pressed against the housing 11 during the fastening process, the first sealing element 13 will not press against the side surface of the cover plate assembly 12, thereby effectively reducing the risk of deformation of the cover plate assembly 12.

[0078] In this embodiment, the battery 1 includes a housing 11, a cover assembly 12, and a first sealing member 13. One end of the housing 11 has a first opening 113. The cover assembly 12 is connected to the housing 11 and seals the first opening 113. The first sealing member 13 is disposed between the cover assembly 12 and the housing 11. The first sealing member 13 bypasses the side surface of the cover assembly 12 and is sealed to both the cover assembly 12 and the housing 11. A gap exists between the first sealing member 13 and the side surface of the cover assembly 12. By leaving a gap between the first sealing member 13 and the side surface of the cover assembly 12, this application ensures that the first sealing member 13 will not compress the side surface of the cover assembly 12 during the fastening process between the cover assembly 12 and the housing 11, 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 housing 11 includes a fastening portion 111 that engages with the cover assembly 12. A first sealing member 13 is located between the fastening portion 111 and the cover assembly 12. The first sealing member 13 protrudes from the fastening portion 111. That is, when the housing 11 is fastened to the cover assembly 12 through the first sealing member 13, the first sealing member 13 will protrude from the edge of the fastening portion 111 to ensure that there is sufficient contact area between the fastening portion 111 and the first sealing member 13, thereby improving the sealing performance between the housing 11 and the cover assembly 12.

[0080] The fastening portion 111 and the first sealing member 13 bypass the side surface of the cover plate assembly 12 and fasten to the opposite sides of the cover plate assembly 12. The first sealing member 13 protrudes at least from the portion of the fastening portion 111 located on one side of the cover plate assembly 12. That is, the fastening portion 111 and the first sealing member 13 together bypass the side surface of the cover plate assembly 12 and wrap around the upper and lower sides of the edge area of ​​the cover plate assembly 12 to achieve a seal between the housing 11 and the cover plate assembly 12. The first sealing member 13 protrudes from the fastening portion 111 located on the upper side of the cover plate assembly 12, or from the fastening portion 111 located on the lower side of the cover plate assembly 12, or from the fastening portions 111 located on both the upper and lower sides of the cover plate assembly 12, so that there is sufficient contact area between the fastening portion 111 and the first sealing member 13, thereby improving the sealing performance between the housing 11 and the cover plate assembly 12.

[0081] It should be noted that the specific protrusion method of the first sealing element 13 relative to the fastening part 111 can be selected and adjusted according to actual design requirements, and no special restrictions are imposed here.

[0082] like Figure 3 As shown, the first sealing element 13 includes a first sealing portion 131 that engages between the housing 11 and the cover assembly 12 on opposite sides, and a second sealing portion 132 that protrudes from the housing 11. 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 part of the first sealing element 13 that is compressed due to pressure when the housing 11 and the cover assembly 12 are engaged, and the second sealing portion 132 is the part of the first sealing element 13 that is not compressed, that is, the thickness of the second sealing portion 132 is the initial thickness of the first sealing element 13.

[0083] If the ratio of T1 / T2 is too small, it indicates that the compression of the first seal 13 under pressure is too large, which may cause the first seal 13 to fail due to excessive compression, thereby affecting the sealing effect between the housing 11 and the cover plate assembly 12. It may even cause the side of the cover plate assembly 12 to expand too much, causing deformation of the fastening area between the cover plate assembly 12 and the housing 11 and the pressure relief groove structure provided on the cover plate assembly 12, thus affecting the sealing effect. If the ratio of T1 / T2 is too large, it indicates that the compression of the first seal 13 under pressure is too small, which may cause the fastening between the housing 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 housing 11 and the cover plate assembly 12.

[0084] In this embodiment, the thickness T1 of the first sealing part 131 and the thickness T2 of the second sealing part 132 are set to 0.1≤T1 / T2≤0.8, which ensures that the compression of the first sealing member 13 is controlled within a moderate range, so that the first sealing member 13 can not only play a sealing role, but also will not fail due to excessive compression, thereby ensuring effective sealing between the housing 11 and the cover plate assembly 12.

[0085] In the actual production process, this 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 the actual design requirements, and there are no special restrictions here.

[0086] Optional, such as Figure 3 and Figure 4 As shown, the first sealing member 13 further includes a third sealing portion 133 that engages between the housing 11 and the side surface of the cover assembly 12. A gap exists 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 engages with the cover assembly 12 by passing around its side surface, it can maintain a distance from the side surface of the cover assembly 12 to prevent the first sealing member 13 from being squeezed against the side surface of the cover assembly 12 when deformed under stress. This prevents the cover assembly 12 from deforming or collapsing during the sealing process, thereby ensuring the overall structural stability of the housing assembly 10.

[0087] When the first sealing part 131, which is fastened to the opposite sides of the cover plate assembly 12, is compressed due to pressure, the first compression part will compress towards the third sealing part 133. There is a gap between the third sealing part 133 and the side surface of the cover plate assembly 12, which may cause the third sealing part 133 to expand. If the expansion of the third first sealing part 13 is too large, it means that the compression of the first sealing part 131 is also too large, which may cause the overall sealing of the first sealing part 13 to fail. It may also cause the third first sealing part 13 to be squeezed against the side surface of the cover plate assembly 12, thereby causing the cover plate assembly 12 to deform and affecting the overall structural stability of the housing assembly 10.

[0088] In this embodiment of the application, by setting the thickness T3 of the third sealing part 133 and the thickness T2 of the second sealing part 132 to 1≤T3 / T2≤1.5, it is possible to ensure that the expansion of the first sealing member 13 is controlled within a moderate range, so that the first sealing member 13 can not only play a sealing role, but also will not fail due to excessive expansion, thereby ensuring an effective seal between the housing 11 and the cover plate assembly 12.

[0089] In the actual production process, this 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 the actual design requirements, and there are no special restrictions here.

[0090] like Figure 4 As shown, the housing 11 includes a clamping portion 1111 that fastens to the side of the cover assembly 12 opposite to the other end of the housing 11. The minimum height difference T4 between the side of the clamping portion 1111 opposite to the cover assembly 12 and the side of the cover assembly 12 opposite to the other end of the housing 11 is ≤ 1mm. That is, when the housing 11 is clamped onto the cover assembly 12, the upper surface of the clamping portion 1111 will protrude from the upper surface of the cover assembly 12. If the protrusion of the clamping portion 1111 is too large, it will result in an excessively large overall height of the housing assembly 10 and will also affect the flatness of the surface of the housing assembly 10. By setting the height difference T4 to T4≤1mm, this application can ensure that the housing 11 and the cover assembly 12 are effectively fastened together while avoiding a significant impact on the overall height of the housing assembly 10.

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

[0092] When the lowest point of the support portion 1112 in the thickness direction of the cover plate assembly 12 is lower than the connection between the support portion 1112 and the main body portion 112, the support portion 1112 is fastened towards the inside of the main body portion 112. If the height difference is too large, the support portion 1112 may squeeze the cell assembly 30 placed inside the main body portion 112. When the lowest point of the support portion 1112 in the thickness direction of the cover plate assembly 12 is higher than the connection between the support portion 1112 and the main body portion 112, the support portion 1112 is fastened towards the top of the main body portion 112. If the height difference is too large, the overall height of the housing assembly 10 may be too large, which may also result in a low space utilization rate inside the housing 11, thereby affecting the energy density of the battery 1.

[0093] In some embodiments, such as Figure 3As shown, the outer diameter T6 of the main body 112 and the inner diameter T7 of the support 1112 satisfy the relationship: 0.3mm ≤ T6 - T7 ≤ 10mm. The support 1112 is a bent structure with rounded corners at the bend. The inner diameter of the support 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 1112 is small, it indicates that the support 1112 bends deeply into the housing 11, and since the bend of the support 1112 is formed by rolling, it may cause the support 1112 to break. If the difference between the outer diameter T6 of the main body 112 and the inner diameter T7 of the support 1112 is large, it indicates that the support 1112 bends shallowly into the housing 11, which may result in a poor engagement between the support 1112 and the cover assembly 12.

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

[0095] In actual production, the difference can be set to 0.3mm, 1mm, 2mm, 5mm, 8mm or 10mm, etc., and there are no special restrictions here.

[0096] In other embodiments, the inner diameter of the snap-fit ​​portion 1111 is less than or equal to the inner diameter of the support portion 1112 to ensure that the snap-fit ​​portion 1111 and the upper surface of the cover assembly 12 have sufficient snap-fit ​​area, thereby ensuring the sealing effect between the housing 11 and the cover assembly 12.

[0097] The cover plate assembly 12 and the snap-fit ​​part 1111 overlap in the axial direction of the housing 11, and the width of the overlapping part in the radial direction of the housing 11 is greater than or equal to 0.2 mm. That is, the snap-fit ​​width between the upper surface of the cover plate assembly 12 and the first sealing member 13 and the snap-fit ​​part 1111 is greater than or equal to 0.2 mm, so as to ensure that the snap-fit ​​part 1111 and the cover plate assembly 12 have sufficient sealing area, thereby ensuring the effective sealing between the housing 11 and the cover plate assembly 12.

[0098] Correspondingly, the portion of the support 1112 that abuts against the first seal 13 and the portion of the cover assembly 12 that is projected onto the housing 11 in the axial direction overlap, and the width of the overlapping portion in the radial direction of the housing 11 is greater than or equal to 0.2 mm. That is, the engagement width between the lower surface of the cover assembly 12 and the first seal 13 and the support 1112 is greater than or equal to 0.2 mm, so as to ensure that the support 1112 and the cover assembly 12 have sufficient sealing area, thereby ensuring the effective sealing of the housing 11 and the cover assembly 12.

[0099] In addition, such as Figure 3 As shown, the width T8 of the clamping part 1111 in the radial direction of the housing 11 and the diameter T9 of the cover assembly 12 satisfy the relationship: T8 ≥ 0.03T9. If the width of the clamping part 1111 in the radial direction of the housing 11 is too small, it will also result in the clamping area between the clamping part 1111 and the cover assembly 12 being too small, thereby affecting the sealing effect between the housing 11 and the cover assembly 12.

[0100] In some other embodiments, a rounded corner is provided at the connection between the main body 112 and the support 1112. That is, when the support 1112 is bent toward the inside of the main body 112, a rounded corner is provided at the connection between the main body 112 and the support 1112 to avoid the support 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 part 1112 has sufficient bending radius when it bends toward the inside of the main body 112, thereby further preventing the support part 1112 from breaking due to stress concentration during the bending process.

[0102] It should be noted that the cover plate assembly 12 is provided with protrusions to increase the overall gas storage space of the housing assembly 10. When the housing 11 and the cover plate assembly 12 are fastened together by the first sealing member 13, the distance between the edge of the fastening part 1111 and the protrusion on the cover plate assembly 12 is greater than or equal to 0, and the distance between the first sealing member 13 and the protrusion on the cover plate assembly 12 is greater than or equal to 0, so as to avoid the protrusion on the cover plate assembly 12 from affecting the sealing effect between the housing 11 and the cover plate assembly 12.

[0103] In some embodiments, such as Figure 5 As shown, the cover assembly 12 includes a first protrusion 123 protruding away from the housing 11 and a recess 124 recessed towards the housing 11. The recess 124 abuts against the cell assembly 30. The first protrusion 123, the recess 124, and the housing 11 enclose the cell assembly 30 to form a first air chamber 14. That is, when the cover assembly 12 is assembled with the housing 11, the recess 124 on the cover assembly 12 directly abuts against the cell assembly 30 to achieve a live design for the cover assembly 12. The first protrusion 123, the recess 124, the housing 11, and the cell assembly 30 enclose the first air chamber 14, which stores the gas generated during the operation of the battery 1. In other words, the first air chamber 14 effectively improves 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 consequently improving 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 within the area enclosed by the first protrusion 123, meaning that the first air chamber 14 is also annularly arranged. By setting the first air chamber 14 as annular, the gas stored in the first air chamber 14 is more evenly distributed within the housing assembly 10, thereby making the stress on the cover assembly 12 more even, which helps to improve the stability of the housing assembly 10 during use.

[0105] The width of the recess 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 recess 124 is too small, the area of ​​the recess 124 that is used to abut against the battery cell assembly 30 will be too small, which is not conducive to the live design of the cover plate assembly 12. If the width of the recess 124 is too large, the air chamber space inside the housing assembly 10 will be reduced, thereby affecting the gas storage capacity of the housing assembly 10.

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

[0107] In addition, such as Figure 6 As shown, in this embodiment, the height difference P4 between the side of the first protrusion 123 facing away from the housing 11 and the side of the recess 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 gas chamber 14 will be small, which is not conducive to gas storage; 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 the actual design requirements, and there are no special restrictions here.

[0109] In some embodiments, such as Figure 1 As shown, the cell assembly 30 includes a positive current collector 31, a negative current collector 32, and a core 33. The positive current collector 31 is located between the core 33 and the terminal assembly 20, and the negative current collector 32 is located between the core 33 and the cover plate assembly 12. The maximum height difference T10 between the side of the cover plate 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 plate assembly 12 and the negative current collector 32 to ensure that the housing assembly 10 has sufficient gas storage capacity, thereby improving the overall service life of the battery 1.

[0110] In some embodiments, such as 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, the pressure relief groove 121 extends in a ring along the circumference of the first protrusion. Since a first air chamber 14 is formed below the first protrusion 123, by providing the pressure relief groove 121 on the first protrusion 123, when the gas pressure stored in the first air chamber 14 is large, it can be relieved in time through the pressure relief groove 121, thereby helping to reduce the risk of explosion of the housing assembly 10 during use.

[0111] The bottom of the pressure relief groove 121 is the part that is forced open 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 force 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 housing 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 the actual design requirements, and there are no special restrictions here.

[0113] In other embodiments, such as Figure 7 As shown, the angle β formed by the sidewall and bottom of the pressure relief groove 121 satisfies the relationship: 95°≤β≤165°, that is, the sidewall of the pressure relief groove 121 tends to expand so that the pressure relief groove 121 can be pulled open when pressure is released. If the angle is too large, the stamping area will be too large, making molding difficult, and the strength of the cover assembly 12 will be reduced, making it unable to withstand sufficient gas pressure, thereby reducing the overall safety performance and service life of the housing assembly 10. If the angle is too small, the pressure required for the gas to break through the pressure relief groove 121 will be too large, thereby increasing the risk of explosion. At the same time, a small angle will cause the pressure relief groove 121 to deform during the battery manufacturing process, thereby reducing safety.

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

[0115] Optional, such as Figure 5As shown, the cover assembly 12 also includes a second protrusion 125 protruding away from the housing 11. The second protrusion 125 is located within the area enclosed by the recess 124. The second protrusion 125 and the recess 124 are used to enclose the 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 within the housing assembly 10, the gas storage capacity of the housing assembly 10 can be further and effectively improved, thereby helping to improve the safety performance and service life of the housing assembly 10, and thus improving the service life of the battery 1.

[0116] Among them, such as Figure 6 As shown, the second protrusion 125 has a second through hole 1251. The second through hole 1251 extends through the second protrusion 125 along the thickness direction of the second protrusion 125. The second through hole 1251 can be used as an injection hole to facilitate the injection operation during the battery manufacturing process; or, the second through hole 1251 can also be used as a vent hole to facilitate the discharge of gas generated during the battery formation process, thereby helping to improve the storage capacity of the battery 1 for the generated gas during use, and thus improving 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 recessed relative to the first protrusion 123. This is because the second protrusion 125 has a second through hole 1251, which will be sealed later. Recessed design of the second protrusion 125 can prevent the height of the corresponding position of the second through hole 1251 after sealing from being higher than the height of the first protrusion, thereby affecting the overall height of the housing 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 second protrusion 125 will be too high, thus affecting the overall height of the housing assembly 10. Alternatively, the height of the first protrusion may 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, the height of the sealing position will be higher than the height of the first protrusion 123 after the second through hole 1251 on the second protrusion 125 is sealed, thus affecting the flatness of the cover plate assembly 12 surface.

[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 the actual design requirements, and no special restrictions are imposed here.

[0120] In other embodiments, such as 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 will be difficult for the gas generated during the formation of the battery 1 to be discharged. 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, such as Figure 8 As shown, in the protrusion direction along the second protrusion 125, at least part of the sidewall of the second through hole 1251 is inclined away from the axis of the second through hole 1251, with an inclination angle α≤70°. That is, in the protrusion direction along the second protrusion 125, at least part of the sidewall of the second through hole 1251 has an expanding tendency to facilitate the discharge of gas.

[0122] In the second through hole 1251, along the protrusion direction of the second protrusion 125, it may include a straight cylindrical section and an inclined section that are interconnected. The inclination angle of the inclined section is α. The inclined section facilitates the subsequent sealing operation of the second through hole 1251. Alternatively, along the protrusion direction of the second protrusion 125, the sidewall of the second through hole 1251 may be inclined as a whole, i.e., the second through hole 1251 is an inclined hole with an inclination angle of α. The specific structure of the second through hole 1251 can be selected and adjusted according to actual design requirements, and no special restrictions are imposed here.

[0123] Optional, such as Figure 9 As shown, the housing assembly 10 also includes a third seal 126, which connects to the second protrusion and seals the second through hole 1251. The third seal 126 includes a transition portion 1261 recessed towards the housing 11, which extends into the second through hole 1251, meaning the third seal 126 has an overall inverted V-shaped structure. Because the third seal 126 itself is relatively thin, providing the transition portion 1261 on the third seal 126 helps to place the third seal 126 in the second through hole 1251, facilitating welding with the second protrusion 125.

[0124] The diameter P3 of the transition portion 1261 and the diameter P1 of the second through hole 1251 satisfy the relationship: 0.2P1≤P3≤P1. If the diameter of the transition portion 1261 is too large, the third seal 126 may not be able to be assembled into the second through hole 1251, thus making it impossible to weld and seal the second through hole 1251. If the diameter of the transition portion 1261 is too small, the third seal 126 may not be easy to put into the second through hole 1251, thus affecting the efficiency and quality of the welding seal.

[0125] In the actual manufacturing process, the specific value of the diameter of the transition part 1261 can be designed and adjusted according to the diameter of the second through hole 1251, and no special restrictions are imposed 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, during installation, 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, so as to avoid interference between the third seal 126 and the battery cell assembly 30 located in the housing 11.

[0127] In some embodiments, when the second through hole 1251 is a straight cylindrical hole, the welding surface (side surface) of the third seal 126 can be chamfered, and the chamfered welding surface forms an acute angle with the side of the third seal 126 facing the second through hole 1251 (e.g., Figure 9 As shown, this allows welding to be performed through the gap between the welding surface of the third seal 126 and the sidewall of the second through hole 1251 during sealing, thereby ensuring the sealing effect of the third seal 126.

[0128] It should be noted that, in order to ensure the welding effect between the third seal 126 and the sidewall of the second through hole 1251, the width of the weld 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 no special restrictions are imposed 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. In this case, the inclined direction of the welding surface after chamfering is consistent with the inclined direction of the inclined section of the second through hole 1251, so that the welding surface of the third seal 126 can fit against the side wall of the inclined section, thereby facilitating the welding of the third seal 126 to the side wall of the second through hole 1251.

[0130] like Figure 6As shown, a pressure relief groove 121 is provided on the cover 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 assembly 12 satisfy the relationship: 0.5D1 < D < D1. By providing the pressure relief groove 121 on the cover assembly 12, when a large amount of gas is generated during the use of the battery 1, it can be pushed open through the pressure relief groove 121 to relieve pressure, thereby reducing the risk of the battery 1 exploding 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 assembly 12 to 0.5D1 < D < D1, it can be ensured that the pressure relief groove 121 has sufficient pressure relief area, thereby ensuring the safety of the battery 1 during use.

[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 battery 1, the opening pressure of the pressure relief groove 121 needs to meet the following requirements: 0.3 MPa < P < 5 MPa, and the thickness at the location of the pressure relief groove 121 needs to meet the following requirements: 30 μm < τ < 200 μm. If the opening pressure of the pressure relief groove 121 is too low or the thickness at the location of the pressure relief groove 121 is too low, the lifespan of battery 1 will be too short; if the opening pressure of the pressure relief groove 121 is too high or the thickness at the location of the pressure relief groove 121 is too high, the probability of battery 1 exploding or other safety accidents will be greater.

[0132] In some embodiments, the battery 1 further includes a protective layer (not shown in the figure), which is at least disposed on the side of the cover assembly 12 facing the receiving cavity. The thickness of the protective layer is greater than or equal to 0.5 micrometers and less than or equal to 10 micrometers. 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 actual manufacturing, the thickness of the protective layer can be set to 0.5 micrometers, 1 micrometer, 2 micrometers, 5 micrometers, 8 micrometers, or 10 micrometers, etc. The specific value of the thickness can be selected and adjusted according to design requirements, and no special limitation is made here.

[0133] The protective layer can be provided only on the side of the cover assembly 12 facing the receiving cavity to reduce the risk of the cover assembly 12 being corroded by the electrolyte; or the protective layer can also be provided on the side of the cover assembly 12 away from the receiving cavity to reduce the risk of the cover assembly 12 being corroded by the external environment.

[0134] In other embodiments, the thickness of the protective layer at the location corresponding to the pressure relief groove 121 is less than the thickness of the protective layer at other locations, so as to ensure that the protective layer protects the cover 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 Figure 10 , Figure 10 which is a schematic structural diagram of the housing 11 provided in this embodiment. The present 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 Figure 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 depression 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 makes the space inside the battery 1 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, when the deformation amount of the support portion 1112 reaches the maximum value and if the pressure inside the battery 1 continues to increase until the cover plate assembly 12 for sealing the battery 1 is broken through 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 Figure 10 , the support portion 1112 includes two side walls opposite to each other in the second direction, and the second direction is perpendicular to the first direction. Among them, the second direction can be referred to Figure 10 the Y direction in

[0139] Specifically, the minimum distance H9 between the two side walls of the support portion 1112 cannot be too large to prevent excessive recessed space in the support portion 1112, which could lead to 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, this embodiment sets the minimum distance between the two side walls to no more than 5% of the height of the battery 1. This design fully considers the actual needs of the battery 1. Experimental verification shows that 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 effective relief, and the internal capacity of the battery 1 will not be significantly reduced due to excessive distance between the two side walls, thereby affecting the battery's working performance and range.

[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 as a rounded corner, which is intended to improve the molding quality of the support portion 1112. Specifically, the rounded corner design can effectively disperse stress during the recessed 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... Figure 10 The shell 11 is designed to meet the following condition: 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 aims to optimize the connection area between the support part 1112 and the main body 112, reducing the risk of material fatigue or cracking caused by stress concentration in the connection area during the recessed molding process of the support part 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, experimental verification shows that when the arc length H2 of the chamfer meets the above condition, the support part 1112 has high toughness during the molding process and can effectively resist damage that may occur under external high stress environment. Especially during thermoforming or pressure molding, the shell 11 is less likely to crack or deform due to stress concentration, thereby ensuring the reliability of the shell 11.

[0142] Please refer to Figure 10The housing 11 includes not only the main body 112 and the support 1112 as described above, but also a clamping part 1111 connected to the support 1112 and clamping a cover plate towards the support 1112. The clamping part 1111 is configured to clamp the cover plate to prevent it from shaking or shifting. To reduce the risk of structural damage to the support 1112 due to stress concentration during molding, in some embodiments, a chamfer is provided at the second connection between the support 1112 and the clamping part 1111, and the chamfer is a rounded corner. Furthermore, the housing 11 satisfies the following condition: H3 ≥ 1.2 * H5. Here, H3 is the arc length of the chamfer at the second connection, and H5 is the thickness of the main body 112. This structure aims to optimize the connection area between the support 1112 and the clamping part 1111, reducing the risk of material fatigue or cracking due to stress concentration in the connection area during the recessed molding of the support 1112.

[0143] In this embodiment, the arc length H3 of the chamfer at the second connection is set to be no less than 1.2 times the thickness H5 of the main body 112. Experimental verification shows that when the arc length H3 of the chamfer meets the above condition, the support part 1112 has high toughness during the molding process and can effectively resist damage that may occur under external high stress environment. Especially during 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, please refer to Figure 10 The housing 11 satisfies the following condition: 20°≤H1≤90°, where H1 is the included angle between the support portion 1112 and the main body portion 112. Specifically, in this embodiment, the included angle between the support portion 1112 and the main body portion 112 is set to no greater than 90°, that is, the support portion 1112 is bent downward relative to the horizontal plane, thereby reducing the occupancy rate of the support portion 1112 in the height direction and providing a larger internal space for the battery 1. In addition, setting the included angle between the support portion 1112 and the main body portion 112 to no less than 20° is 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 and providing a buffer for the internal pressure of the battery 1.

[0145] In some embodiments, please refer to Figure 10The housing 11 satisfies the following condition: H10 ≥ 0.5 * H5. Where H10 is the thickness of the support portion 1112, and H5 is the thickness of the main body portion 112. Specifically, while a thinner support portion 1112 can reduce the overall weight of the battery 1, it is more prone to damage during the molding process and when deformed outwards, thus affecting the safety of the battery 1. Experimental verification shows that when the thickness H10 of the support portion 1112 is set within the above-mentioned range, the support portion 1112 is less prone to damage during the molding process and when deformed outwards under pressure, thereby ensuring the reliability of the housing 11.

[0146] In some embodiments, please refer to Figure 11 , Figure 11 yes Figure 10 The schematic diagram of the main body 112 shows that the main body 112 includes a base 201, a curved portion 202, and a support portion 203. 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 serve as the bottom wall of the shell 11 for support.

[0147] In some embodiments, please refer to Figure 12 , Figure 12 yes Figure 11 In the enlarged view of part A, the thickness of the bent portion 202 gradually increases from the end of the bent portion 202 connected to the base 201 to the other end of the bent portion 202 connected to the support portion 203 in the extending direction. This allows the main body 112 to effectively disperse stress during bending, thereby reducing the risk of damage. Furthermore, to better disperse stress, the housing 11 satisfies the following condition: F9 ≥ 0.8 * F8. Here, F9 is the dimension of the outer radius of the bent portion 202 in the height direction of the battery 1, and F8 is the thickness of the support portion 203. Specifically, experimental verification shows that when F9 is less than 0.8 * F8, the stress in the main body 112 is relatively concentrated during bending, which can easily lead to structural damage.

[0148] In some embodiments, please refer to Figure 11 , Figure 13 A recessed platform 204 is provided at the end of the support portion 203 away from the bending portion 202, and the recessed platform 204 bends inward relative to the support portion 203 towards the battery 1, thereby enhancing the sealing performance of the housing 11 to a certain extent. Furthermore, to ensure that the recessed platform 204 is not easily torn during manufacturing, the housing 11 satisfies the following condition: F19 ≤ F8; where F8 is the thickness of the support portion 203 and F19 is the depth of the recessed platform 204. Experiments have verified that when F19 is greater than F8, the recessed platform 204 is more likely to cause the support portion 203 to break during manufacturing.

[0149] In some embodiments, please refer to Figure 13 The housing assembly satisfies the following condition: W ≥ 0.05 mm. Where W is the width of the recessed platform 204. Specifically, to ensure the sealing performance of the recessed platform 204 for the battery 1, this embodiment designs the width W of the recessed platform 204 to be no less than 0.05 mm. Experimental verification shows that when the width W of the recessed platform 204 is less than 0.05 mm, its sealing performance is poor.

[0150] In some embodiments, please refer to Figure 13 To ensure that the recessed platform 204 is not easily damaged by stress concentration during manufacturing, the edges of the recessed platform 204 are rounded. Furthermore, to improve the stress dispersion effect of the support portion 1112 during the manufacturing of the recessed platform 204, at least one bend in the recessed platform 204 can be set as two rounded corners, and the arcs of the two rounded corners face opposite directions.

[0151] In addition, in some embodiments, please refer to Figure 14 , Figure 14 This is a schematic diagram of another type of recessed platform provided in this embodiment. Alternatively, the edge of the recessed platform 204 can be set as a chamfered C-angle, which can also achieve the manufacturing of the recessed platform 204.

[0152] In some embodiments, please refer to Figure 10 , Figure 15 Before the recess, the housing 11 includes a flared section 301. The flared section 301 is recessed to form a support portion 1112. The flared section 301 has a gradually increasing inner diameter in the direction from the main body portion 112 of the housing 11 to the support portion 1112 of the housing 11. The flared design makes the opening of the housing 11 more spacious, thereby reducing the risk of friction between the battery 1 and the housing wall during assembly due to the small opening of the housing in the traditional housing design. This allows the battery 1 to be assembled into the interior of the housing 11 more smoothly during the assembly process.

[0153] In some embodiments, please refer to Figure 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. This is intended to ensure that, during the process of the flared section 301 being recessed and stretched to form the support portion 1112, the thickness of the support portion 1112 will not be too thin due to an excessively small F1, thereby guaranteeing the structural strength of the support portion 1112.

[0154] In some embodiments, please refer to Figure 15Before any dent occurs, the housing 11 also includes a first equal-diameter section 302 connected to the flared section 301. The first equal-diameter section 302 is configured to form the main body 112 of the housing 11. The housing 11 satisfies the condition that F5 ≤ 20°. F5 is the angle between the extending direction of the flared section 301 and the extending 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. Experiments have verified that when the angle F5 is greater than 20°, the support portion 1112 is less likely to retract during molding, making the molding process of the support portion 1112 more difficult.

[0155] In some embodiments, the housing 11 includes a main body 112, a support 1112, and a clamping portion 1111. The clamping portion 1111 is connected to the support 1112 and clamps the cover plate toward the support 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 1112, and the second equal-diameter section 303 is bent to form the clamping portion 1111.

[0156] In some embodiments, please refer to Figure 15 The housing 11 satisfies the following condition: F2 ≥ 1 mm. Wherein, F2 is the dimension 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 clamping part 1111. Experimental verification shows that when the dimension F2 of the second equal-diameter section 303 in the height direction of the battery 1 is designed within the above range in this embodiment, after the second equal-diameter section 303 is bent to form the clamping part 1111, the orthographic projection dimension of the clamping part 1111 on the cover plate body is large, that is, the area of ​​the clamping part 1111 that clamps the cover plate body is large, so that the cover plate body can be fully fixed by the clamping part 1111 and is not prone to shaking or displacement.

[0157] In some embodiments, the diameter of the second equal-diameter section 303 is larger 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 larger than the diameter of the first equal-diameter section 302, so that during the assembly process of the battery 1, the battery 1 can avoid rubbing against the second equal-diameter section 303 of the casing 11, thereby improving the assembly efficiency of the battery 1 and reducing the damage that may be caused to the surface of the battery 1 or the interior of the casing 11 due to friction.

[0158] Furthermore, in some embodiments, the housing 11 satisfies the following condition: F3 / F4 ≥ 0.8. Here, 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 clearance for the battery 1, allowing for smoother insertion and a more efficient assembly process.

[0159] In some embodiments, please refer to Figure 16 The second equal-diameter section 303 has a cut surface at the end furthest from the flared section 301. The housing 11 satisfies the following condition: 30% ≤ F12 / F10 ≤ 90%, where F12 is the orthographic projection of the cut surface along the thickness direction of the second equal-diameter section 303, and F10 is the thickness of the second equal-diameter section 303. Specifically, experiments have verified 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, ultimately affecting 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 to scratch other components during the assembly process of the housing 11.

[0160] In some embodiments, please refer to Figure 15 Based on F2≥1mm, the housing 11 satisfies the following condition: F1 / F2≥0.5. Wherein, F1 is the dimension of the flared 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 flared 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 to ensure that after the flared section 301 is stretched to form the support portion 1112, the support portion 1112 has a relatively thick thickness and is not easily damaged.

[0161] To ensure the corrosion resistance of the housing 11, the housing 11 can be nickel-plated either before or after product manufacturing. When the housing 11 is nickel-plated before manufacturing, a nickel layer with a thickness of 2 μH to 8 μH is plated onto the surface of the support portion 1112 in the main body 112, and a nickel layer with a thickness of 1 μH to 5 μH is plated onto the surfaces of the base 201 and the bent portion 202. When the housing 11 is nickel-plated after manufacturing, a nickel layer with a thickness of 0.1 μH to 5 μH is plated onto the surface of the support portion 1112 in the main body 112, and a nickel layer with a thickness of 0.5 μH to 8 μH is plated onto the surfaces of the base 201 and the bent portion 202. Experiments have shown that when the housing 11 is nickel-plated using the above methods, the corrosion resistance of the housing 11 is good.

[0162] This application also provides a housing 11, which includes a main body 112 and a support portion 1112 connected to the main body 112. The support portion 1112 is recessed towards the interior of the housing 11 along a first direction and includes two opposing side walls in a second direction, which is perpendicular to the first direction. The housing 11 satisfies the following condition: 0 < H1 ≤ 0.05 * H; where E1 is the minimum distance between the two side walls, and H is the height of the battery 1. The support portion 1112 in the housing 11 can deform during the process of increased internal pressure in the battery 1 to increase the internal space of the battery 1. This effectively delays the triggering of the explosion-proof valve when releasing internal pressure, preventing the explosion-proof valve from prematurely breaking due to excessive instantaneous pressure.

[0163] In some embodiments, please refer to Figure 10 The housing assembly satisfies the following condition: 0.1mm ≤ E7 - E8 ≤ 5mm. Here, 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 housing 11 onto the cover plate. Specifically, experimental verification shows that when the difference between the inner diameter E8 of the orthographic projection of the support portion 1112 of the housing 11 onto the cover plate and the inner diameter E7 of the contact surface between the first seal and the cover plate is greater than 5mm, the larger size of the contact portion between the first seal and the cover plate makes it difficult to position the cover plate during assembly, leading to easy displacement of the cover plate. When the difference between the inner diameter E8 of the orthographic projection of the support portion 1112 onto 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, the smaller size of the contact portion between the first seal and the cover plate makes assembly of the cover plate difficult.

[0164] In some embodiments, such as Figure 17As shown, battery 1 includes a cell assembly 30 and insulating tape 40. The cell assembly 30 is located inside the housing 11, and the insulating tape 40 is disposed 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 at least a portion of the structure in the cell assembly 30 from the side wall of the housing 11 to meet the insulation design requirements between at least a portion of the structure in the cell assembly 30 and the side wall of the housing 11.

[0165] Among them, such as Figure 18 As shown, the insulating tape 40 forms a folded area on the side of the cell assembly 30 facing the housing 11. That is, when the insulating tape 40 is placed on the side surface of the cell assembly 30, in order to ensure the stability of the insulating tape 40 on the side surface of the cell assembly 30, part of the insulating tape 40 can be folded to the side of the cell assembly 30 facing the housing 11. After folding, the folded insulating tape 40 needs to be flattened. At this time, the insulating tape 40 will form a folded area on the side of the cell assembly 30 facing the housing 11. The setting of the folded area can form an electrolyte flow channel, allowing the electrolyte to flow along the folded area to the cell assembly 30, thereby helping to improve the wetting effect of the cell assembly 30, and thus helping to improve the overall performance of the battery 1.

[0166] In some embodiments, such as Figure 18 and 19 As shown, the battery 1 includes a terminal assembly 20, which is insulated from the end of the housing 11 away from the cover assembly 12. The cell assembly 30 includes a positive current collector 31 (current collector 35) and a negative current collector 32 (current collector 35) which are electrically connected to the terminal assembly 20. That is, the terminal assembly 20 and the housing 11 serve as the two poles of the battery 1, and the positive current collector 31 and the terminal assembly 20 are the same pole of the battery 1.

[0167] The insulating tape 40 is disposed between the side surface of the positive current collector 31 and the side wall of the housing 11 to insulate the positive current collector 31 from the side wall of the housing 11. At the same time, the insulating tape 40 forms a folded area on the side of the positive current collector 31 facing the terminal assembly 20, so that the electrolyte can flow along the folded area to the core 33 connected to the positive current collector 31, thereby helping to improve the wetting effect of the core 33 and thus improving the overall performance of the battery 1.

[0168] The insulating tape 40 forms multiple folded areas on the side of the positive electrode current collector 31 facing the terminal assembly 20. The multiple folded areas are evenly spaced along the circumference of the positive electrode current collector 31, so that the electrolyte can flow evenly along the multiple folded areas in the circumference of the positive electrode current collector 31, thereby helping to improve the wetting uniformity of the core 33 and thus improve the overall performance of the battery 1.

[0169] Reference Figures 17 to 20As shown, this application provides a battery, including a housing 11, a terminal assembly 20, a core 33, a current collector 35, and insulating tape 40; the terminal assembly 20 is disposed within the housing; the core 33 is disposed within the housing; the current collector 35 is disposed within the housing and includes a protrusion 351 and a disc 352 surrounding the protrusion 351. Along the axial direction of the battery 1, the protrusion 351 protrudes from the disc 352, the protrusion 351 is connected to the terminal assembly 20, and the side of the disc 352 facing away from the terminal assembly 20 is connected to the core 33; wherein, along the axial direction of the battery 1, the height of the protrusion 351 is M1, the thickness of the disc 352 is M2, and M1≤2M2.

[0170] In the embodiments of this application, the current collector 35 includes a disk body 352 and a protrusion 351 extending from the disk body 352. The current collector 351 connects to the terminal assembly 20, ensuring a secure connection between the current collector 35 and the terminal assembly 20 and preventing incomplete or burst soldering during the welding process. It also ensures a sufficient connection area between the current collector 35 and the terminal assembly 20, achieving effective welding and thus meeting the overcurrent requirements of the battery 1. Simultaneously, the protrusion 351 does not increase the overall thickness of the disk body 352, avoiding impact on the internal space of the battery 1's casing. Furthermore, the parameter setting of M1≤2M2 ensures contact between the protrusion 351 and the terminal assembly 20 without making the protrusion 351 too large, further preventing any impact on the internal space of the battery 1's casing.

[0171] In some embodiments, reference Figure 17 As shown, in order to ensure the insulation between the outer peripheral surface of the collector 35 and the inner sidewall of the housing, insulating tape 40 is also included for insulation between the collector 352 and the inner sidewall of the housing.

[0172] In some embodiments, the thickness of the insulating tape 40 is M3, where M3≤M1≤2(M2+M3). Therefore, when the current collector 35 is covered with the insulating tape 40, the height of the protrusion 351 can also protrude beyond 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 Figure 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. This can better ensure the connection between the protrusion 351 of the current collector 35 and the terminal assembly 20, realize the effective welding between the protrusion 351 and the terminal assembly 20, and thus ensure that the connection between the current collector 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 Figure 21 As shown, the protrusion 351 has a third through hole 353, and the terminal assembly 20 has 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 facilitates the electrolyte injection process, ensuring that the electrolyte flows smoothly into the battery 1. Simultaneously, the opposite arrangement of the third through hole 353 and the first groove 212 ensures the accuracy of the electrolyte injection process, guaranteeing the smooth flow of the electrolyte into the battery 1 and ensuring the effective use of the battery 1.

[0175] In some embodiments, the diameter of the third through hole 353 is M4, and the diameter of the first groove 212 is M5, where M4 ≥ M5. That is, the diameter of the third through hole 353 on the collector plate 35 is not smaller than the diameter of the first groove 212 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 inside the housing and close to the opening of the housing, while the collector plate 35 is located inside the housing and away from the opening of the housing. Therefore, the diameter of the third through hole 353 on the side away from the opening is not smaller than the diameter of the first groove 212 on the side close to the opening, which can ensure that the electrolyte can flow smoothly into the core 33, so that the core 33 is fully wetted, avoids electrolyte leakage, and ensures the normal use requirements of the battery 1.

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

[0177] It should also be noted that the reference Figure 19 As shown, in this embodiment, the pressure ring 25 is disposed on the side of the pole post 21 near the collector plate 35 to press the pole post 21 against the surface of the convex shroud, thereby ensuring that the pole post 21 can fully contact the convex shroud, thus ensuring the connection between the pole post 21 and the convex shroud, and avoiding the phenomenon of soldering failure or poor soldering between the collector 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 near the collector plate 35 is M7, and the maximum outer diameter of the pressure ring 25 is M8, where M8 ≥ M6 ≥ M7. Accordingly, the maximum outer diameter of the protrusion 351 is larger than the inner diameter of the first groove 212, ensuring the contact area between the collector plate 35 and the terminal assembly 20, thereby guaranteeing the connection between the collector plate 35 and the terminal assembly 20. Simultaneously, the maximum outer diameter of the protrusion 351 does not exceed the maximum outer diameter of the pressure ring 25, reserving more air chamber space within the housing and reducing internal pressure.

[0179] In some embodiments, the diameter of the disc body 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 current collector 35 and the winding core 33 can be facilitated, while ensuring the performance of the winding core 33 and avoiding the inability to meet the overcurrent requirements of the battery 1 due to the size of the winding core 33 being too small, thus ensuring the normal use of the battery 1.

[0180] In some embodiments, the surface area of ​​the disk body 352 is M 11 The area of ​​the radial end face 331 of the core 33 is M. 12 M 11 ≥70% M 12 Therefore, by setting the above parameters, the assembly of the current collector 35 and the winding core 33 can be facilitated, while ensuring the performance of the winding core 33. This avoids the inability to meet the overcurrent requirements of the battery 1 due to the insufficient connection area of ​​the winding core 33, thus ensuring the normal use of the battery 1.

[0181] In some embodiments, the thickness M2 of the disc body 352 is set between 0.2mm and 2mm. By setting the above parameters, the thickness of the disc body 352 can be made moderate, avoiding interference with the original internal space of the battery 1, meeting the assembly space requirements of the battery cell of the battery 1, and also facilitating the forming and processing of the disc body 352.

[0182] In some embodiments, to avoid short circuit between the manifold 35 and the inner sidewall of the housing, the core 33 includes two oppositely arranged end faces 331 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 core 33, and the other end of the insulating tape 40 is attached to the side of the disc body 352 away from the core 33.

[0183] In some embodiments, reference Figure 22As shown, the insulating tape 40 located in the transition area between the core 33 and the disc 352 forms a flow channel 34 for the passage of electrolyte. During the assembly process, the insulating tape 40 is flattened, creating a gap in the transition area between the core 33 and the disc 352. In this area, the insulating tape 40 does not have a perfect seal, thus forming a flow channel 34 for the electrolyte, allowing it to flow into this area. Therefore, when the electrolyte seeps out, this area becomes an effective communication channel, facilitating the flow of electrolyte between the positive and negative electrodes of the battery 1, ensuring the electrical performance of the core 33. Simultaneously, electrolyte outside the core 33 can easily flow back into the core 33 through this channel, ensuring the battery 1 can smoothly complete the charging and discharging process and guarantee its normal operation.

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

[0185] In some embodiments, the width of the flow channel 34 along the radial direction of the core 33 is M. 13 M 13 ≤40%M 10 In this embodiment, the width M of the flow channel 34 13 The width is unilateral. Therefore, it can prevent the width of the flow channel 34 from being too large, avoid a large diameter difference between the core 33 and the disc 352, and prevent the tape from being unable to be flattened and applied to the disc 352 and the core 33. This ensures that the insulating tape 40 can be firmly attached to the core 33 and the disc 352, achieving the insulating effect of the insulating tape 40.

[0186] In some embodiments, the height of the core 33 is M. 14 Along the axial direction of the core 33, the insulating adhesive paper 40 is attached to the side surface 332 of the core 33 at a height of M. 15 M 14 >M 15 >3mm. In this embodiment, the length of the insulating tape 40 covering the side 332 of the core 33 is greater than 3mm, but it does not completely cover the entire side 332 of the core 33. This ensures that the insulating tape 40 can be firmly attached to the side 332 of the core 33, and also prevents the insulating tape 40 from being attached to the core 33 at an excessive height, thus avoiding waste of the insulating tape 40.

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

[0188] In some embodiments, the insulating tape 40 is arranged circumferentially along the core 33, and the two ends of the insulating tape 40 overlap after being enclosed along the core 33. During the application process, the insulating tape 40 needs to be applied around the entire circle of the manifold 35 and the core 33, and the overlapping area formed by the two ends of the insulating tape 40 prevents any gaps in the outer periphery of the manifold 35 or the core 33. Furthermore, the overlapping area at both ends of the insulating tape 40 ensures the stability of the connection, prevents tape detachment, and guarantees the insulating effect of the insulating tape 40.

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

[0190] In some embodiments, the width of the insulating tape 40 attached to the disk body 352 along the radial direction of the disk body 352 is M. 16 20% M9 > M 16 >1.5mm. In this embodiment, the width M of the insulating tape 40 attached to the disk 352 is... 16 With a single-sided width, the insulating tape 40 is applied to the side of the disc 352 away from the core 33 with a width greater than 1.5mm, but not exceeding 20% ​​of the diameter of the entire disc 352. This ensures that the insulating tape 40 can be firmly attached to the side of the collector disc 35 away from the core 33, and also prevents the width of the insulating tape 40 on the disc 352 from being too large, thereby preventing any impact on the working performance of the disc 352 and avoiding waste of the insulating tape 40.

[0191] In addition, the insulating tape 40 does not cover the entire disc 352, which can also prevent the insulating tape 40 from occupying too much internal space in the housing, thus avoiding reducing the air chamber space in the housing and reducing the pressure inside the housing.

[0192] In some embodiments, reference Figure 18 As shown, the insulating tape 40 includes a first region 401 connected to the side of the disc 352 opposite to the core 33 and a second region 402 connected to the side surface 332 of the core 33. The maximum diameter of the first region 401 is M. 16 The maximum diameter of the second region 402 is M. 17 50% M 17 ≤M 16≤95%M 17 By adopting the above settings, the width of the flow channel 34 can be avoided from being too large, thereby ensuring that the insulating tape 40 can be smoothly applied to the core 33 and the collector plate 35 after being flattened, thus ensuring the insulation effect of the insulating tape 40.

[0193] In some embodiments, the distance between the bottom surface of the insulating adhesive paper 40 away from the disk body 352 and the bottom surface of the second region 402 is M. 17 The distance M between the bottom surface of the insulating adhesive paper 40 away from the disc body 352 and the bottom surface of the core 33 on the side away from the disc body 352. 18 1% M 18 ≤M 17 ≤60%M 18 In this embodiment, the insulating tape 40 does not need to be applied to all sides 332 of the core 33, thus avoiding waste of the insulating tape 40. At the same time, it also prevents the filling of too much internal space of the casing, thereby avoiding the reduction of the air chamber space inside the casing due to the application of the insulating tape 40, and ensuring the safe use of the battery 1.

[0194] In some embodiments, a battery further includes a first insulating member 50, which is disposed on the side of the disc 352 opposite to the winding core 33 to achieve insulation between the disc 352 and the housing. The first insulating member 50 ensures insulation between the surface of the current collector 35 and the housing, and works in conjunction with the insulating tape 40 to prevent short circuits between any part of the current collector 35 and the housing, thus ensuring the normal operation of the battery 1.

[0195] In some embodiments, reference Figure 19 and Figure 21 As shown, the diameter of the first insulating member 50 is M. 19 Along the radial direction of the core 33, the thickness of the insulating tape 40 in the second region 402 is M. 20 M 19 >M 10 +2M 20 In other words, in this embodiment, the diameter of the first insulating member 50 is larger than the overall diameter of the core 33 after adhesive is applied. Therefore, 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 Figure 24 and Figure 25As shown, the battery 1 also includes a first insulating member 50, which is located inside the housing 11 and on the side of the cell assembly 30 facing the housing 11. That is, the first insulating member 50 is used to isolate the end of the housing 11 from at least a portion of the structure in the cell assembly 30 to meet the insulation design requirements between at least a portion of the structure in the cell assembly 30 and the end of the housing 11.

[0197] The first insulating member 50 has a notch 506 on its side surface. The notch 506 penetrates the first insulating member 50 along its thickness direction. That is, the side surface of the first insulating member 50 has a notch structure, which allows the first insulating member 50 to deform at the notch 506 when it is assembled into the shell, thereby facilitating the smooth insertion of the first insulating member 50 into the shell.

[0198] In some embodiments, the side surface of the first insulating member 50 is provided with a plurality of notches 506, which 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 circumference, thereby further facilitating the smooth insertion of the first insulating member 50 into the shell.

[0199] In this embodiment, multiple notches 506 are evenly distributed along the circumference of the first insulating member 50. This means that when the first insulating member 50 deforms during installation, the resulting stress can be evenly distributed along its circumference, thereby helping to improve the structural stability of the first insulating member 50 during installation. 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 between the sidewall and the bottom surface of the notch 506 is an acute angle or a right angle (≤90°). The sidewalls of the notch 506 refer to the two sidewalls of the notch 506 arranged opposite each other along the circumference of the first insulating member 50, and the bottom surface of the notch 506 refers to the surface connecting the two sidewalls. By setting the angle between the sidewall and the bottom surface of the notch 506 to ≤90°, the first insulating member 50 is more easily deformed by compression or pulling at the location of the notch 506 during the insertion process, thus facilitating the smooth insertion 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 collector plate 35 is smaller than the arc length of the side closer to the collector plate 35, which can ensure that the notch 506 can provide deformation space for the first insulating member 50, so as to facilitate the assembly of the first insulating member 50 into the shell.

[0202] In some embodiments, the arc length of the notch 506 near the collector plate 35 is M. 29 , 0.1mm≤M29 ≤10mm. By setting the above parameters, sufficient deformation space can be ensured, while avoiding the insulation effect being affected by an excessively large 506 notch.

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

[0204] Since the first insulating member 50 is installed between the current collector 35 and the housing 11, and the first insulating member 50 has a third groove 501 on the side facing the current collector 35, the setting of the third groove 501 can reserve a gas chamber space inside the housing 11, thereby reserving expansion space for the core inside the housing 11 and ensuring the safety 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 law, PV=NRT, reserving a certain volume inside the housing 11 can reduce the internal pressure of the housing 11, thereby ensuring the safety of the battery 1. In addition, the setting of the third groove 501 on the first insulating member 50 can also reserve a part of the internal space of the housing 11 without affecting the original volume of the housing 11, thereby avoiding the entire interior of the housing 11 being filled with solids, further ensuring the safety of the battery 1, and also reducing the overall weight of the battery 1, meeting the lightweight design requirements of the battery 1.

[0205] It is understandable that the ideal gas law is PV = NRT, where P is the pressure (Pa) and V is the gas volume (m³). 3 T is the temperature (K), n is the amount of substance of the gas (mol), and R is the molar gas constant (also called the universal gas constant) (J / (mol·K)). It can be seen that the gas volume V is inversely proportional to the pressure P. When the gas volume V is larger, the pressure P is smaller. Therefore, by setting the third groove 501 on the first insulating member 50, the gas volume space inside the shell 11 can be increased, that is, the pressure inside the shell 11 can be reduced, thereby ensuring the safety 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 collector plate 35 and the inner side wall of the housing 11, adhesive can be applied between the collector plate 35 and the housing 11 to cooperate with the first insulating component 50 and ensure the insulation between the collector plate 35 and the housing 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 collector 35 is M. 25 , of which 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 collector 35 is the remaining thickness of the first insulating member 50 after the third groove 501 is removed. The remaining thickness of the first insulating member 50 after the third groove 501 is removed is not less than 0.3mm, but not more than 80% of the overall thickness of the first insulating member 50. This ensures that the depth of the third groove 501 is sufficient and also ensures the strength of the first insulating member 50, preventing the first insulating member 50 from breaking during assembly or use due to insufficient remaining thickness, thus ensuring the normal use of the battery 1.

[0208] In some embodiments, refer to Figure 25 and Figure 26 As shown, the first insulating member 50 has an inner reinforcing rib 502 and an outer reinforcing rib 503 on the side facing the collector plate 35. The inner reinforcing rib 502 and the outer reinforcing rib 503 are spaced apart, and the third groove 501 is located between the inner reinforcing rib 502 and the outer reinforcing rib 503. By setting the inner reinforcing rib 502 and the outer reinforcing rib 503, the problem of reduced overall strength of the first insulating member 50 due to the opening of the third groove 501 is avoided, thus ensuring the overall strength of the first insulating member 50 and its normal use.

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

[0210] In some embodiments, refer to Figure 25 and Figure 26As shown, multiple connecting reinforcing ribs 504 are provided, and these multiple connecting reinforcing ribs 504 are arranged at intervals along the circumference of the first insulating member 50, and can divide the third groove 501 into multiple parts. This ensures uniform strength across all parts of the first insulating member 50, and the connecting reinforcing ribs 504 connect the inner ring reinforcing ribs 502 and the outer ring reinforcing ribs 503, thereby increasing the strength of the inner ring reinforcing ribs 502 and the outer ring reinforcing ribs 503, and thus guaranteeing the strength of the first insulating member 50.

[0211] It is understood that in this embodiment, there are eight connecting reinforcing ribs 504, and the eight connecting reinforcing ribs 504 are arranged at uniform intervals along the circumference of the first insulating member 50; and, in order to ensure the connection strength between the inner ring reinforcing ribs 502 and the outer ring reinforcing ribs 503, the number of connecting reinforcing ribs 504 should be set to not less than four in the specific configuration.

[0212] In some embodiments, refer to Figure 25 and Figure 26 As shown, the outer reinforcing rib 503 is fitted around the outer periphery of the inner reinforcing rib 502, and the distance between the inner reinforcing rib 502 and the outer reinforcing rib 503 is M. 26 The maximum outer diameter of the first insulating element 50 is M. 27 30% M 27 ≤M 26 ≤70%M 27 This ensures that the distance between the inner reinforcing rib 502 and the outer reinforcing rib 503 is appropriate, avoiding the reinforcement effect being affected by an excessively large gap between the inner and outer reinforcing ribs 502 and 503.

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

[0214] In some embodiments, refer to Figure 27As shown, the outer circumferential edge of the first insulating member 50 is provided with a transition slope 505 that gradually slopes from the side away from the current collector 35 toward the side closer to the current collector 35 and toward the housing 11. During the assembly of the battery 1, in order to ensure the insulation effect, the diameter of the first insulating member 50 and the inner diameter of the inner sidewall of the housing 11 are usually only slightly different. Therefore, by providing a transition slope 505 on the outer circumference of the first insulating member 50, that is, by providing a chamfer on the outer circumference 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, which facilitates installation.

[0215] In some embodiments, refer to Figure 23 As shown, along the axial direction of the first insulating member 50, the outer surface of the transition slope 505 is set in 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 rounded, which not only facilitates the assembly of the first insulating member 50 into the housing 11, but also, through the setting of the above parameters, avoids the radius of the rounded corner being too large, thereby preventing the gap between the outer circumferential 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 role.

[0216] In some embodiments, the height of the transition slope 505 along the axial direction of the first insulating member 50 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 assembly of the first insulating member 50 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 outer periphery 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 role.

[0217] In some embodiments, a winding core is also included, located on the side of the first insulating member 50 near the current collector, and the diameter of the winding core is M. 30 The inner diameter of the shell 11 is M. 31 The maximum diameter of the first insulating element 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 housing 11. This ensures that the first insulating member 50 can provide insulation between the collector plate 35 and the housing 11, and also facilitates the assembly of the first insulating member 50 into the housing 11.

[0218] In some embodiments, for ease of assembly, a second opening 114 is provided on one side of the housing 11, and a fourth through hole 507 is provided on the first insulating member 50, with the second opening 114 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 During the assembly process, after the collector plate 35 is connected to the terminal, the insulation between the collector plate 35 and the housing 11 is achieved by the first insulating component 50. At the same time, in order to ensure the insulation effect, a plastic component is also provided between the housing 11 and the first insulating component 50. Therefore, the diameter of the fourth through hole 507 is smaller than the diameter of the opening, which can provide space for the assembly of the plastic component to further ensure the insulation effect.

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

[0221] Please refer to Figures 28-29 , Figure 28 This is a schematic diagram of the structure of the collector disk 35 provided in the embodiments of this application. Figure 1 , Figure 29 yes Figure 28 The diagram shows an enlarged view of part A. This application provides a battery 1, which includes a casing, a core 33, and a current collector 35. The casing has a receiving chamber, the core 33 is disposed in the receiving chamber, and the current collector 35 is welded to the core 33. The core 33 includes an end face facing the current collector 35, and the welding area between the end face and the current collector 35 accounts for 10%-90% of the end face area, that is, the welding area between the end face and the current collector 35 is greater than or equal to 10% and less than or equal to 90% of the end face area.

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

[0223] Specifically, if the welding area is insufficient, the welding point may be weak. When the battery 1 is subjected to external impact or vibration, the welding point may easily fall off or break, thereby causing problems such as internal 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 on 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 current collector 35, thus limiting the upper limit of the welding area.

[0224] This application provides a battery 1, which includes a core 33. The welding area between the end face of the core 33 and the current collector 35 is between 10% and 90% of the end face area. Based on the structure of the core 33 itself, the effective welding area is guaranteed, which can increase the connection strength between the current collector 35 and the core 33 and improve the stability of the structural connection.

[0225] For example, the welding area between the end face of the core 33 and the collector 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., but this application embodiment does not limit this.

[0226] In some embodiments, the collector plate 35 has a plurality of second welding areas 36 arranged around the center of the collector plate 35, and each second welding area 36 has a plurality of welding lines 360 on the side facing the core 33. The welding lines 360 are the welding paths of the collector plate 35 and the core 33. The arrangement of the second welding areas 36 around the center of the collector plate 35 can better adapt to the end face shape of the core 33 and increase the welding area of ​​the end face of the collector plate 35 and the core 33.

[0227] In some embodiments, the radius of the manifold 35 is R, and the length of at least one bonding wire 360 ​​is greater than or equal to 0.05R. For example, if the radius of the manifold 35 is R and is 20mm, then the length of at least one bonding wire 360 ​​is greater than or equal to 1mm. This embodiment of the application does not limit this.

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

[0229] In some embodiments, the line width of each bonding 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., and this application embodiment does not limit this.

[0230] In some embodiments, the weld width of each weld line 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., and this application embodiment does not limit this.

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

[0232] For example, the included 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., and this application embodiment does not limit it.

[0233] Understandably, the bend 361 increases the welding area, which improves the reliability and durability of the weld. This avoids problems such as weld cracking and detachment due to insufficient weld strength, thereby improving the fatigue resistance of the weld and extending the service life of battery 1.

[0234] In some embodiments, each weld line 360 ​​includes a plurality of bends 361 connected in sequence. It is understood that sequentially providing a plurality of bends 361 not only ensures weld strength but also guarantees weld continuity and consistency. The included angle between the first connecting segment 3611 and the second connecting segment 3612 of each second weld area 36 may be equal or unequal.

[0235] In some embodiments, in each bend 361, one end of the first connecting segment 3611 and one end of the second connecting segment 3612 are connected to each other to form an endpoint, and the other ends of the first connecting segment 3611 and the other ends of the second connecting segment 3612 are spaced apart and 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 bonding wire 360 ​​includes multiple bends 361, the width of the bonding wire 360 ​​is greater than the width of the bonding wire 360 ​​itself. The first connecting segment 3611 and the second connecting segment 3612 form a triangular structure. The width of the bonding wire 360 ​​is equal to the height G1 from the top of the bend 361 to the bottom of the bend 361. G1 is greater than or equal to 0.5mm, such as 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, etc., which are not limited in this application.

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

[0238] If the initial end and the final end are located on different straight lines radiating outward from the center of the collector plate 35, the line passing through the final end and the center of the collector plate 35 is the first line, and the line passing through the final 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 weld line 360 ​​extends radially along the core 33. Specifically, each second welding area 36 includes a plurality of weld lines 360 arranged sequentially in the circumferential direction, each weld line 360 ​​extending radially along the core 33. This arrangement maximizes the utilization of the space in the second welding area 36, ​​increasing the welding area.

[0240] In some embodiments, the collector plate 35 includes a central portion 300 and a plurality of connectors 311. The plurality of connectors 311 are connected to the central portion 300 and extend radially toward the collector plate 35. The plurality of connectors 311 are spaced apart. A second welding area 36 is provided between two adjacent connectors 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 connector 311. The first gap 321 communicates with the second gap 322.

[0241] Specifically, the first gap 321 extends radially along the current collector 35, and the second gap 322 is arranged circumferentially along the current collector 35, forming a hollow area surrounding a portion of the second welding area 36. It is understandable that chemical reactions occur inside the battery 1, such as overcharging, overheating, and electrolyte decomposition. This may generate gas, and excessive gas accumulation could lead to battery 1 expansion or explosion. The hollow area ensures that gas generated during the use of the winding core 33 can be promptly discharged from the winding core 33, forming a smooth exhaust channel.

[0242] In some embodiments, the collector plate 35 includes three connectors 311, which divide the collector plate 35 into three second welding areas 36, each of which is a fan-shaped structure. The number of connectors 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 this embodiment.

[0243] In some embodiments, each connector 311 is bent away from the core 33. This bending ensures effective contact between the current collector 35 and the battery cover, allowing the battery cover to be charged and form cathodic protection, improving the cover's corrosion resistance and thus ensuring its safety. Furthermore, the protrusion increases the perforated area of ​​the current collector 35, widening the venting channel for gas discharge from the core 33 and improving cell safety.

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

[0245] In some embodiments, the contact area between the end face and the manifold 35 accounts for 50%-100% of the end face area. That is, the contact area between the end face and the manifold 35 is greater than or equal to 50% and less than or equal to 100% of the end face area.

[0246] Understandably, since the collector plate 35 has gaps or protrusions, the end face cannot be fully connected to the collector plate 35. For example, the contact area between the end face and the collector plate 35 can be 50%, 60%, 70%, 80%, 90%, or 100% of the end face area. This application embodiment does not limit this.

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

[0248] In some embodiments, the length of the weld wire 360 ​​located in the middle of the second welding area 36 is a first length, and the length of the weld 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 is understood that in order to ensure the consistency of multiple weld wires 360 in the second welding area 36, ​​the difference between the first length and the second length can be set to a small value.

[0249] For example, each second welding area 36 is provided with three welding lines 360. The three welding lines 360 include a first line body located in the middle and two second lines body located on both sides of the first line body along the circumference of the collector plate 35. The two second lines body have the same length. The length of the first line body is a first length, and the length of the second line body is a second length. The difference between the first length and the second length 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, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, etc. The embodiments of this application do not limit this.

[0250] Please refer to Figures 30-31 , Figure 30 This is a schematic diagram of the structure of the collector disk 35 provided in the embodiments of this application. Figure 2 , Figure 31 This is a schematic diagram of the structure of the collector disk 35 provided in the embodiments of this application. Figure 3 In some embodiments, the collector plate 35 is a plane as a whole. Since the collector plate 35 does not have a connector 311 and a gap structure in the middle, the collector plate 35 includes a plurality of weld lines 360 arranged radially, and the length of each weld 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 from the center of the collector plate 35. Furthermore, the extension line of each welding line 360 ​​passes through the center point of the fan-shaped structure. To ensure welding quality, the lengths of multiple welding lines 360 can be kept the same, and the line width of the welding lines 360 can be appropriately increased.

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

[0253] Please refer to Figure 32 , Figure 32 This is a schematic diagram of the structure of the collector disk 35 provided in the embodiments of this application. Figure 4 In some embodiments, a plurality of welding wires 360 are arranged circumferentially around the core 33. Specifically, each second welding area 36 may be provided with a plurality of welding wires 360 in a direction away from the center of the core 33, each welding wire 360 ​​extending circumferentially around the core 33, and the plurality of welding wires 360 forming an approximately circular structure.

[0254] In some examples, the bonding wire 360 ​​forms an arc-shaped structure along the circumference, and the length G2 of the bonding wire 360 ​​is equal to the arc length corresponding to the included angle at both ends of the bonding wire 360.

[0255] like Figure 33As shown, the battery 1 also includes a terminal assembly 20, which is connected to the end of the housing 11 away from the cover plate assembly 12. The terminal assembly 20 has a first through hole 211, which can serve as an injection hole for liquid filling during battery manufacturing; alternatively, it can also serve as a vent hole for venting gases generated during battery formation, thereby improving the battery 1's ability to store generated gases during use and thus enhancing its safety. The diameter of the first through hole 211 can be greater than or equal to 1 mm to facilitate liquid filling or venting.

[0256] In some embodiments, a first groove 212 is formed on the side of the terminal assembly 20 away from the housing 11, and a first through hole 211 is formed at the bottom of the first groove 212. The battery 1 also includes a cell assembly 30, which is located inside the housing 11 and is connected to the terminal assembly 20. By forming the first groove 212 on the side of the terminal assembly 20 away from the housing 11, the thickness of the terminal assembly 20 at the location 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 cell assembly 30, and the first welding area 213 is arranged around the first through hole 211. That is, when welding the terminal assembly 20 and the cell assembly 30, circumferential welding can be performed along the first through hole 211, thereby helping to reduce the impact of the arrangement of the first through hole 211 on the welding effect of the terminal assembly 20 and the cell assembly 30, and ensuring the current carrying capacity at the bottom of the first groove 212.

[0258] It should be noted that before welding the terminal assembly 20 and the cell assembly 30, the first through hole 211 can be sealed with a sealing pin to compensate for the reduction in 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 cell assembly 30, which helps to ensure the welding effect of the terminal assembly 20 and the cell assembly 30.

[0259] In other embodiments, such as Figure 40 As shown, the terminal assembly 20 includes a pole post 21 and a second sealing member 24. The pole post 21 is connected to the end of the housing 11 away from the cover plate assembly 12. A first groove 212 is formed on the pole post 21. The second sealing member 24 is used to be disposed in the first groove 212 and to seal the first through hole 211. The side of the second sealing member 24 facing the first through hole 211 has a protruding abutment portion 241, which is used to abut against the bottom of the first groove 212.

[0260] Because a certain bulge is generated at the bottom of the first groove 212 during the welding of the terminal assembly 20 and the cell assembly 30, the second seal 24 may wobble under the action of the bulge when it is placed in the first groove 212 and welded. By providing an abutment portion 241 at the bottom of the second seal 24, the impact of the bulge on the stability of the second seal 24 can be reduced, thereby ensuring the welding effect between the second seal 24 and the terminal assembly 20. In particular, to further prevent the second seal 24 from wobbling during placement, the height of the abutment portion 241 can be set to be greater than or equal to 0.1 mm.

[0261] The second sealing member 24 has at least two protruding abutment portions 241 on the side facing the first through hole 211, and the abutment portions 241 are symmetrically distributed radially along the first through hole 211 to further improve the stability of the second sealing member 24 during the welding process and ensure the welding effect between the second sealing member 24 and the terminal assembly 20. In order to avoid the abutment portions 241 interfering with the welding between the pole post 21 and the cell assembly 30, the distance between the two radially symmetrically distributed abutment portions 241 can be set to be greater than the first welding area 213 of the pole post 21 and the cell assembly 30.

[0262] In some embodiments, such as Figure 34 As shown, the first groove 212 has an overall expanding 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 post 21 is set to N2≥3mm, so that the sidewall of the first groove 212 is inclined, and the inclination angle γ of the sidewall of the first groove 212 relative to the axial direction of the first groove 212 is ≥3°, which facilitates the assembly and welding of the second seal 24. In addition, to ensure that the pole post 21 has sufficient strength, the thickness of the pole post 21 at the position corresponding to the first groove 212 can be set to be greater than or equal to 0.5mm.

[0263] The electrode post 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 housing 11 away from the cell assembly 30, and the second connecting part 215 is located on the side of the housing 11 facing the 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 cell assembly 30.

[0264] The terminal assembly 20 also 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 to achieve an insulating connection between the pole post 21 and the housing 11.

[0265] The first connecting part 214 is provided with a first protruding rib 2141 on the side facing the second insulating member 22. When assembling the terminal assembly 20, the first protruding rib 2141 can squeeze the second insulating member 22 so that the first connecting part 214 and the second insulating member 22 are tightly connected, thereby improving the sealing effect between the first connecting part 214 and the second insulating member 22.

[0266] Among them, such as Figure 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 between the first connecting part 214 and the second insulating member 22.

[0267] In some embodiments, the terminal assembly 20 further includes a pressure ring 25 disposed between the third insulating member 23 and the second connecting portion 215, and 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] The pressure ring 25 has a second protruding rib 253 on the side facing the third insulating member 23. When assembling the terminal assembly 20, the second protruding rib 253 can squeeze the third insulating member 23 so that the pressure ring 25 and the third insulating member 23 are tightly connected, thereby improving the sealing effect between the pressure ring 25 and the third insulating member 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 between the second rib 253 and the third insulating member 23.

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

[0271] The overlapping portion of the orthographic projections of the second support portion 252 and the second connecting portion 215 along the axial direction of the battery 1 has a radial width of N7. The non-overlapping portion of the orthographic projections of the second support portion 252 and the second connecting portion 215 along the axial direction of the battery 1 has a radial width of N8. The thickness of the first support portion 251 is N9. The radial width of the second support portion 252 along the battery 1 is N10. The distance between the outer surface of the second support portion 252 and the central axis of the battery 1 is N11. To ensure the overall structural stability of the terminal assembly 20 and the riveting stability of the pole post 21 and the pressure ring 25, the above parameters can be set to N7≥0.05N8, N9≥0.3mm, and N10≥0.1N11. This also ensures that the overall structure of the battery 1 does not deform after the second insulating member 22 and the third insulating member 23 are compressed.

[0272] It should be noted that in this embodiment, the second insulating member 22 and the third insulating member 23 are separately arranged, and the edge of the second insulating member 22 protrudes to the side surface of the first connecting portion 214, forming a first protective portion 221 on the side surface of the first connecting portion 214 for external insulation, preventing short circuits between the terminal assembly 20 and the housing 11 after prolonged use of the battery 1. The height N12 of the first protective portion 221 and its radial width N13 satisfy the relationship N12 + N13 ≥ 0.8 mm.

[0273] Correspondingly, the third insulating member 23 protrudes from the side surface of the pressure ring 25 and forms the second protective part 231. The height N14 of the second protective part 231 and the width N15 in the radial direction of the battery 1 satisfy the relationship N14+N15≥0.8mm, so as to avoid short circuit between the terminal assembly 20 and the housing 11 after the battery 1 has been used for a long time.

[0274] The second insulating component 22 is made of fluororubber or soluble polytetrafluoroethylene, and the third insulating component 23 is made of fluororubber, soluble polytetrafluoroethylene, polypropylene, or polyphenylene sulfide.

[0275] In some embodiments, such as Figure 36 As shown, when the second connecting part 215 extends directly below the end of the housing 11, the pressure ring 25 can be removed. At this time, the second connecting part 215 can be riveted by flipping. That is, the riveting part 216 of the second connecting part 215 is initially in a vertical state. After it extends into the housing 11, it flips to a horizontal state and is riveted to the corresponding third insulating member 23.

[0276] The second connecting portion 215 has a second groove 217 on the side facing the cell assembly 30. The second groove 217 is located near the edge of the riveting portion 216 to reduce the risk of cracking due to deformation during the 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 riveting part 216 and the third insulating member 23, the width N18 of the riveting part 216 in the radial direction of the battery 1 can be set to 0.2mm≤N18≤10mm, and the height N19 of the riveting part 216 can be set to 0.2mm≤N19≤5mm.

[0278] It should be noted that, in order to further prevent the pole post 21 from deforming or cracking after the riveting part 216 is flipped, a pressure ring 25 can be added between the riveting part 216 and the third insulating member 23 (e.g., Figure 37 As shown), this method improves the overall structural strength of the terminal assembly 20 while controlling the riveting height.

[0279] Furthermore, when using a flip-riveting method for connection, the riveting part 216 can also be disposed on the first connecting part 214, and correspondingly, the second groove 217 is formed on the side of the first connecting part 214 away from the cell assembly 30 (e.g. Figure 38 As shown), the pressure ring 25 is also disposed between the corresponding riveting part 216 and the second insulating member 22 (as shown). Figure 39 As shown in the figure, the specific parameter settings can be referred to in the embodiment where the riveting part 216 is set on the second connecting part 215, and will not be described in detail here.

[0280] Secondly, this application provides a battery pack, which includes a battery. The specific structure of the battery is as described in the above embodiments. Since this battery pack adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0281] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A battery, characterized by, The battery comprises: a shell, one end of the shell being formed with a first opening; a cover plate assembly connected with the shell and sealing the first opening; a first sealing element arranged between the cover plate assembly and the shell, the first sealing element bypassing the side surface of the cover plate assembly and being sealingly connected with the cover plate assembly and the shell; the first sealing element has a gap between the side surface of the cover plate assembly.

2. The battery of claim 1, wherein, The shell comprises a fastening part fastened with the cover plate assembly, the first sealing element is located between the fastening part and the cover plate assembly, and the first sealing element protrudes from the fastening part.

3. The battery of claim 2, wherein, The fastening part and the first sealing element bypass the side surface of the cover plate assembly and are fastened with the opposite sides of the cover plate assembly, and the first sealing element protrudes from at least the part of the fastening part located on one side of the cover plate assembly.

4. The battery of claim 1, wherein, A pressure relief groove is formed on the cover plate assembly, the pressure relief groove is annular, and the diameter D of the pressure relief groove and the diameter D1 of the cover plate assembly satisfy the relationship: 0.5D1 5. The battery of claim 2, wherein, The battery further comprises a protective layer, the protective layer is arranged at least on the 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 comprises an electrode assembly and an insulating adhesive paper, the electrode assembly is located in the shell, the insulating adhesive paper is arranged between the side surface of the electrode assembly and the side wall of the shell, and the insulating adhesive paper forms a folding area on the side of the electrode assembly facing one end of the shell.

7. The battery of claim 6, wherein, The battery comprises a terminal assembly, the terminal assembly is insulatively connected with one end of the shell away from the cover plate assembly, the electrode assembly comprises a positive current collector, the positive current collector is electrically connected with the terminal assembly, the insulating adhesive paper is arranged between the side surface of the positive current collector and the side wall of the shell, and the insulating adhesive paper forms the folding area on the side of the positive current collector facing the terminal assembly.

8. The battery according to any one of claims 1 to 5, characterized in that, The battery further comprises an electrode assembly and a first insulating element, the electrode assembly is located in the shell, the first insulating element is located in the shell, the first insulating element is located on the side of the electrode assembly facing one end of the shell, the side surface of the first insulating element is formed with a notch, and the notch penetrates the first insulating element along the thickness direction of the first insulating element.

9. The battery of claim 8, wherein, The side surface of the first insulating element is formed with a plurality of notches, and the plurality of notches are arranged along the circumferential direction of the first insulating element.

10. The battery of claim 9, wherein, The plurality of notches are distributed equidistantly along the circumferential direction of the first insulating element.

11. The battery of claim 8, wherein, The included angle between the side wall of the notch and the bottom surface of the notch is an acute angle or a right angle.

12. The battery of any one of claims 1 to 5, wherein, The battery further comprises a terminal assembly, the terminal assembly is connected with one end of the shell away from the cover plate assembly, and a first through hole is formed on the terminal assembly.

13. The battery of claim 12, wherein, A first groove is formed on the side of the terminal assembly away from the shell, and the first through hole is formed in the bottom of the first groove.

14. The battery of claim 13, wherein, The battery further comprises an electrode assembly, the electrode assembly is located in the shell, the electrode assembly is connected with the terminal assembly, the bottom of the first groove comprises a first welding area for welding with the electrode assembly, and the first welding area is arranged around the first through hole.

15. The battery of claim 13, wherein, The terminal assembly comprises a pole and a second sealing element, the pole is connected with one end of the shell away from the cover plate assembly, and the first groove is arranged on the pole; the second sealing element is arranged in the first groove and seals the first through hole, and a side of the second sealing element facing the first through hole is provided with an abutting portion, and the abutting portion is used for abutting with the bottom of the first groove.

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

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