Hard-shell battery and electronic device

Abstract

The invention discloses a hard-shell battery and an electronic device. The hard-shell battery comprises a shell, an electrode assembly, a first electrode terminal and a first insulating part, the shell is arranged in a conductive mode, the electrode assembly is arranged in the shell, and the electrode assembly comprises a first pole piece, a second pole piece and an isolating membrane arranged between the first pole piece and the second pole piece. At least part of the first electrode terminal is located on one side of the electrode assembly in the first direction, the first electrode terminal comprises a first tab group, the first tab group comprises a plurality of stacked first tabs, and the first tabs are connected with the first pole piece. In the second direction, the first insulating part is arranged on one side of the first electrode terminal, and the first insulating part is in contact with the first tab group and the shell. The first direction is perpendicular to the second direction, and the second direction is parallel to the thickness direction of the electrode assembly. And the first insulating part is arranged on one side of the first tab group along the second direction, so that the shaking of the first tab group is favorably inhibited, and the safety and reliability of the hard-shell battery are favorably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, and in particular to a hard-shell battery and an electronic device. BACKGROUND

[0002] With the popularity of electronic devices, how to improve the use experience of electronic devices has become the goal of the industry, and the safety and reliability of the battery affect the use experience of the electronic device.

[0003] When the steel shell battery is impacted, part of the tab located in the shell body is prone to shaking, which may cause the tab to be damaged, short-circuited, and the like, affecting the safety and reliability of the battery. SUMMARY

[0004] Therefore, the present application provides a hard-shell battery and an electronic device, which is beneficial to improve the performance and service life of the hard-shell battery.

[0005] In a first aspect, the present application provides a hard-shell battery, which includes a shell body, an electrode assembly, a first electrode terminal, and a first insulating member. The shell body is electrically conductive. The electrode assembly is arranged in the shell body and includes a first tab, a second tab, and a separation film arranged between the first tab and the second tab. At least part of the first electrode terminal is located on one side of the electrode assembly along a first direction, and the first electrode terminal includes a first tab group, which includes a plurality of first tabs stacked together, and the first tabs are connected to the first tab. Along a second direction, the first insulating member is arranged on one side of the first electrode terminal, and the first insulating member is in contact with the first tab group and the shell body. The first direction is perpendicular to the second direction, and the second direction is parallel to the thickness direction of the electrode assembly.

[0006] In the above embodiment, the first insulating member is arranged on one side of the first tab group along the second direction, which reduces the gap between the first tab group and the shell body along the second direction, is beneficial to suppress the shaking of the first tab group, and is beneficial to reduce the risk of damage to the first tab. The first insulating member also reduces the possibility of contact between the first tab group and the shell body, which is beneficial to reduce the risk of short circuit of the hard-shell battery and electrification of the shell body, thereby improving the safety and reliability of the hard-shell battery.

[0007] In one or more embodiments of the present application, the first tab group includes a first aggregation segment, a first bending segment, and a first connecting segment arranged in sequence, the first aggregation segment is connected to the electrode assembly, and the first connecting segment extends along the second direction. Along the second direction, the shell body includes a first wall and a second wall arranged oppositely, the first insulating member is in contact with the first tab group and the first wall, and the distance between the first bending segment and the first wall is less than the distance between the first bending segment and the second wall. Along the second direction, the projection of the first bending segment overlaps the projection of the first insulating member.

[0008] In the above embodiment, along the second direction, the projection of the first bending section overlaps the projection of the first insulating piece, which is beneficial for the first insulating piece to abut against the first bending section when the hard-shell battery is impacted, thereby helping to suppress the shaking of the first tab group, and on the other hand, the first insulating piece plays a role of blocking the first bending section from contacting the shell, which is beneficial for reducing the risk of short circuit caused by the contact between the first bending section and the shell.

[0009] In one or more embodiments of the present application, the hard-shell battery further comprises a second insulating piece, along the second direction, the second insulating piece is arranged on the side of the first electrode terminal away from the first insulating piece, and the second insulating piece is in contact with both the first tab group and the second wall.

[0010] In the above embodiment, the second insulating piece is arranged on the side of the first electrode terminal away from the first insulating piece, and the second insulating piece is in contact with both the first tab group and the second wall, which further reduces the gap between the first tab group and the shell along the second direction, is beneficial for suppressing the shaking of the first tab group, and is beneficial for reducing the risk of damage to the first tab, the second insulating piece further reduces the possibility of the first tab group contacting the shell, which is beneficial for reducing the risk of short circuit or electrification of the shell of the hard-shell battery, thereby further improving the safety and reliability of the hard-shell battery.

[0011] In one or more embodiments of the present application, the first electrode terminal further comprises a first adapter, the first adapter comprises a second connecting section, a second bending section and a third connecting section arranged in sequence, the second connecting section is connected with the first connecting section, the bending direction of the second bending section is opposite to that of the first bending section, along the first direction, the third connecting section is located on the side of the first connecting section away from the first polymerization section. Along the second direction, the distance between the second bending section and the second wall is less than the distance between the second bending section and the first wall. Along the second direction, the projection of the second bending section overlaps the projection of the second insulating piece.

[0012] In the above embodiment, along the second direction, the projection of the second bending section overlaps the projection of the second insulating piece, which is beneficial for the second insulating piece to abut against the first bending section when the hard-shell battery is impacted, thereby helping to suppress the shaking of the first tab group, and on the other hand, the second insulating piece plays a role of blocking the second bending section from contacting the shell, which is beneficial for reducing the risk of short circuit caused by the contact between the second bending section and the shell.

[0013] In one or more embodiments of the present application, along the first direction, the shell comprises a third wall and a fourth wall arranged opposite to each other, and the distance between the first electrode terminal and the third wall is less than the distance between the first electrode terminal and the fourth wall. Along the first direction, the distance between the first insulating piece and the third wall is L1, which satisfies L1≥0.1mm.

[0014] In the above embodiments, when L1 is greater than or equal to 0.1 mm, the distance between the first insulating member and the third wall in the first direction is not too close, which is beneficial to reduce the risk of interference between the first insulating member and the shell, and facilitates the packaging of the shell.

[0015] In one or more embodiments of the present application, the first pole piece includes a first current collector and a first active material layer arranged in a stack, the first pole piece has a first region and a second region connected to each other, in the first direction, the first region is closer to the first electrode terminal than the second region, and the thickness of the first active material layer of the first region is less than the thickness of the first active material layer of the second region. The first insulating member includes a first portion and a second portion arranged in the first direction, in the second direction, the first portion is located between the shell and the electrode assembly, and the projection of the first portion is located in the first region, and the second portion is located between the shell and the first tab group.

[0016] In the above embodiments, in the second direction, the first portion of the first insulating member is located between the shell and the electrode assembly, the projection of the first portion is located in the first region, and the second portion is located between the shell and the first tab group, which is beneficial to allow the first insulating member to suppress the shaking of the first tab group, reduce the risk of short circuit of the hard-shell battery and charging of the shell, and also beneficial to compensate for the thickness of the first region with a relatively small thickness, improve the uniformity of the pressure on the electrode assembly, and thus improve the interface performance of the electrode assembly.

[0017] In one or more embodiments of the present application, in the first direction, the shell includes a third wall and a fourth wall arranged opposite to each other, the distance between the first electrode terminal and the third wall is less than the distance between the first electrode terminal and the fourth wall. The thickness of the first active material layer of the first region gradually decreases in the direction from the fourth wall to the third wall, the thickness of the first portion gradually increases in the direction from the second wall to the first wall, and the first portion is in contact with the electrode assembly.

[0018] In the above embodiments, the thickness of the first portion gradually increases in the direction from the fourth wall to the third wall, which is beneficial to the fit of the first portion and the part of the electrode assembly with a relatively small thickness, thereby compensating for the thickness of the first region, improving the uniformity of the pressure on the electrode assembly, and improving the interface performance of the electrode assembly.

[0019] In one or more embodiments of the present application, the first portion has an inclined surface in contact with the electrode assembly, the inclined surface has a slope K, and 0.005≤K≤0.14 is satisfied.

[0020] In the above embodiments, when K satisfies 0.005≤K≤0.14, the first portion and the part of the electrode assembly with a relatively small thickness are fitted, thereby compensating for the thickness of the first region, improving the uniformity of the pressure on the electrode assembly, and improving the interface performance of the electrode assembly.

[0021] In one or more embodiments of the present application, the length of the first portion along the first direction is L2, and 2.5 mm≤L2≤10.5 mm is satisfied.

[0022] In the above embodiment, when L2 satisfies 2.5 mm≤L2≤10.5 mm, on the one hand, the first portion will not be too long to exceed the first area along the first direction, which is conducive to reducing the occupied space of the first insulating piece, and on the other hand, the first portion will not be too short, which is conducive to improving the comprehensiveness of the first insulating piece in making up the thickness of the first area, thereby improving the uniformity of the electrode assembly under pressure and improving the interface performance of the electrode assembly.

[0023] In one or more embodiments of the present application, the length of the second portion along the first direction is L3, and 0.1 mm≤L3≤0.3 mm is satisfied.

[0024] In the above embodiment, when L3 satisfies 0.1 mm≤L3≤0.3 mm, on the one hand, the second portion will not be too long to interfere with the shell, which is conducive to the packaging of the shell, and on the other hand, the second portion will not be too short, which is conducive to the existence of overlap between the projection of the second portion along the second direction and the projection of the first bending segment along the second direction, thereby facilitating the first insulating piece to abut against the first bending segment when the hard-shell battery is impacted, and facilitating the suppression of the shaking of the first tab group and reducing the risk of short circuit of the first bending segment contacting the shell.

[0025] In one or more embodiments of the present application, along the third direction, the first portion has oppositely arranged first and second edges, and the first, second, and third directions are perpendicular to each other. Along the second direction, the projection of the first area on the first insulating piece is located between the first and second edges.

[0026] In the above embodiment, along the second direction, the projection of the first area on the first insulating piece is located between the first and second edges, which is conducive to the first insulating piece extending beyond the electrode assembly along the third direction, and is conducive to suppressing the warping of the edges of the first and second tabs in the electrode assembly along the third direction.

[0027] In one or more embodiments of the present application, along the third direction, the shell includes oppositely arranged fifth and sixth walls, and the distance between the fifth wall and the first edge is less than the distance between the fifth wall and the second edge. The distance between the first edge and the fifth wall is D1, and the distance between the second edge and the sixth wall is D2, and 0.1 mm≤D1≤1.5 mm and 0.1 mm≤D2≤1.5 mm are satisfied.

[0028] In the above embodiment, when 0.1mm≤D1≤1.5mm and 0.1mm≤D2≤1.5mm are met, on the one hand, the distance between the first part and the fifth wall and the sixth wall is not too small, which is conducive to the installation of the electrode assembly and the first insulating piece, and reduces the occupied space of the first insulating piece. On the other hand, the first part is not too short, which is conducive to the first insulating piece extending beyond the electrode assembly along the third direction, thereby facilitating the suppression of the warping of the edges of the first and second pole pieces of the electrode assembly along the third direction.

[0029] In one or more embodiments of the present application, along the second direction, the overlapping area of the first part and the first area accounts for 80%-100% of the area of the first area.

[0030] In the above embodiment, when 80%-100% is met, it is conducive to improving the comprehensiveness of the first insulating piece in making up the thickness of the first area, thereby facilitating the improvement of the uniformity of the electrode assembly under pressure and the interface performance of the electrode assembly.

[0031] In one or more embodiments of the present application, the first insulating piece includes a structural part integrally arranged with the shell and an insulating part arranged on the surface of the structural part.

[0032] In the above embodiment, the structural part integrally arranged with the shell is conducive to the shaping of the shape of the first insulating piece, and also conducive to reducing the risk of the first insulating piece moving within the shell when the hard-shell battery is impacted, facilitating the first insulating piece to limit the movement of the electrode assembly, and reducing the risk of cracking at the weld of the shell, thereby improving the reliability of the hard-shell battery.

[0033] In one or more embodiments of the present application, the hard-shell battery further includes a second electrode terminal located on one side of the electrode assembly along the first direction, the second electrode terminal including a second lug group, the second lug group including a plurality of second lugs stacked together, and the second lugs being connected to the second pole pieces. Along the second direction, the first insulating piece is arranged on one side of the second electrode terminal, and the first insulating piece is in contact with both the second lug group and the shell.

[0034] In the above embodiment, along the second direction, the first insulating piece is arranged on one side of the second electrode terminal, and the first insulating piece is in contact with both the second lug group and the shell, thereby reducing the gap between the second lug group and the shell along the second direction, which is conducive to suppressing the shaking of the second lug group and reducing the risk of damage to the second lugs. The first insulating piece also reduces the possibility of the second lug group contacting the shell, thereby reducing the risk of short circuit and electrification of the shell, and improving the safety and reliability of the hard-shell battery.

[0035] In one or more embodiments of the present application, the shell is a stainless steel shell, and the first lug is a cathode lug, which is conducive to playing an insulating role between the shell and the electrode assembly, thereby reducing the risk of short circuit.

[0036] In one or more embodiments of the present application, the shell is an aluminum shell, and the first tab is an anode tab, which is conducive to playing an insulating role between the shell and the electrode assembly and reducing the risk of short circuit.

[0037] The second aspect of the present application also provides an electronic device comprising the hard-shell battery of any of the above embodiments.

[0038] In the above embodiments, the safety and reliability of the hard-shell battery are improved, which is conducive to improving the reliability and use experience of the electronic device.

[0039] The hard-shell battery of the present application comprises a shell, an electrode assembly, a first electrode terminal, and a first insulating member. The shell is conductive. The electrode assembly is arranged in the shell. At least part of the first electrode terminal is located on one side of the electrode assembly along a first direction, and the first electrode terminal comprises a first tab group, the first tab group comprising a plurality of first tabs stacked together, and the first tabs being connected to first tabs. Along a second direction, the first insulating member is arranged on one side of the first electrode terminal, the first insulating member being in contact with both the first tab group and the shell, thereby reducing the gap between the first tab group and the shell along the second direction, which is conducive to suppressing the shaking of the first tab group and reducing the risk of damage to the first tab. The first insulating member also reduces the possibility of contact between the first tab group and the shell, which is conducive to reducing the risk of short circuit of the hard-shell battery, thereby improving the safety and reliability of the hard-shell battery. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 The structural schematic diagram of the hard-shell battery provided by an embodiment of the present application is shown.

[0041] Figure 2 The schematic diagram of the electrode assembly, the first electrode terminal, and the second electrode terminal provided by an embodiment of the present application is shown.

[0042] Figure 3 The cross-sectional schematic diagram of the hard-shell battery provided by an embodiment of the present application is shown.

[0043] Figure 4 The schematic diagram of the stacking of the first tab, the separation film, and the second tab provided by an embodiment of the present application is shown.

[0044] Figure 5 The partial cross-sectional view of the hard-shell battery provided by an embodiment of the present application is shown.

[0045] Figure 6 The cross-sectional view of the first tab provided by an embodiment of the present application is shown.

[0046] Figure 7 The schematic diagram of the first insulating member in the present application is shown. Figure 3

[0047] ​Figure 8 A partial schematic view of a hard-shell battery according to an embodiment of the present application.

[0048] Figure 9 A cross-sectional view of a hard-shell battery according to an embodiment of the present application.

[0049] Figure 10 A cross-sectional view of a hard-shell battery according to another embodiment of the present application.

[0050] Figure 11 A schematic view of an electronic device according to an embodiment of the present application.

[0051] Explanation of main element symbols

[0052] Hard-shell battery 100

[0053] Housing 10

[0054] First wall 11

[0055] Second wall 12

[0056] Third wall 13

[0057] Fourth wall 14

[0058] Fifth wall 15

[0059] Sixth wall 16

[0060] Electrode assembly 20

[0061] First electrode tab 21

[0062] First current collector 211

[0063] First active material layer 212

[0064] First region 21a

[0065] Second region 21b

[0066] Second electrode tab 22

[0067] Second current collector 221

[0068] Second active material layer 222

[0069] Separator 23

[0070] First electrode terminal 30

[0071] First tab group 31

[0072] First aggregation section 311

[0073] First bending section 312

[0074] first connecting section 313

[0075] first tab 31a

[0076] first adapter 32

[0077] second connecting section 321

[0078] second bending section 322

[0079] third connecting section 323

[0080] second electrode terminal 40

[0081] second tab group 41

[0082] second tab 411

[0083] second adapter 42

[0084] first insulating member 50

[0085] first portion 51

[0086] inclined surface 511

[0087] first edge 512

[0088] second edge 513

[0089] structural portion 51a

[0090] insulating portion 51b

[0091] second portion 52

[0092] second insulating member 60

[0093] device body 200

[0094] electronic device 1000

[0095] first direction X

[0096] second direction Y

[0097] third direction Z DETAILED DESCRIPTION

[0098] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments.

[0099] It should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected. When a component is considered to be "connected" to another component, it can be directly connected to another component or there can be a middle component at the same time. When a component is considered to be "provided" on another component, it can be directly provided on another component or there can be a middle component at the same time.

[0100] Unless otherwise specified, the term "a plurality of" as used herein refers to two or more.

[0101] Unless otherwise defined, the "distance" between two components in a certain direction described herein should be understood as the shortest straight line distance between the two components in the direction.

[0102] The terms "first", "second", and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implying the number, specific order or primary and secondary relationship of the indicated technical features.

[0103] The term "vertical" is used to describe the ideal state between two components. In the actual production or use state, there can be an approximate vertical state between the two components. For example, in combination with numerical description, vertical can refer to the angle between two straight lines within the range of 90°±10°, vertical can also refer to the dihedral angle between two planes within the range of 90°±10°, and vertical can also refer to the angle between a straight line and a plane within the range of 90°±10°.

[0104] The term "parallel" is used to describe the ideal state between two components. In the actual production or use state, there can be an approximate parallel state between the two components. For example, in combination with numerical description, parallel can refer to the angle between two straight lines within the range of 180°±10°, parallel can also refer to the dihedral angle between two planes within the range of 180°±10°, and parallel can also refer to the angle between a straight line and a plane within the range of 180°±10°.

[0105] It should be noted that when a parameter is greater than, equal to or less than an endpoint value, it should be understood that the endpoint value allows a tolerance of ±10%, such as A greater than B by 10, which should be understood to include A greater than B by 9, and A greater than B by 11.

[0106] It should be noted that the size of the layer, region, film, plate, block, column, protrusion, recess and the like shown in the drawings is given for better understanding and more convenient description, and the application is not limited to the size shown in the drawings. In order to make the application clear, the elements irrelevant to the description are omitted from the details of the specification.

[0107] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0108] With the increasing prevalence of electronic devices, improving the user experience has become an industry priority. Battery performance and lifespan significantly impact this experience. When a steel-cased battery is impacted, the tabs within the casing can easily vibrate, potentially damaging the tabs and causing short circuits, impacting battery performance and lifespan.

[0109] The present application discloses a hard shell battery, which includes a shell, an electrode assembly, a first electrode terminal and a first insulating member. The shell is conductively configured. The electrode assembly is disposed in the shell, and the electrode assembly includes a first electrode sheet, a second electrode sheet and an isolation membrane disposed between the first electrode sheet and the second electrode sheet. At least a portion of the first electrode terminal is located on one side of the electrode assembly along a first direction, and the first electrode terminal includes a first tab group, the first tab group includes a plurality of stacked first tabs, and the first tab is connected to the first pole sheet. Along the second direction, a first insulating member is disposed on one side of the first electrode terminal, and the first insulating member is in contact with both the first tab group and the shell. The first direction is perpendicular to the second direction, and the second direction is parallel to the thickness direction of the electrode assembly.

[0110] The above-mentioned first insulating member is arranged on one side of the first pole tab group along the second direction, which reduces the gap between the first pole tab group and the shell along the second direction, is beneficial to suppressing the shaking of the first pole tab group, and is beneficial to reducing the risk of damage to the first pole tab. The first insulating member also reduces the possibility of contact between the first pole tab group and the shell, which is beneficial to reducing the risk of short circuit of the hard shell battery, thereby improving the safety and reliability of the hard shell battery.

[0111] The following will describe some embodiments of the present application in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0112] See also Figure 1 and Figure 2 , Figure 2 The first electrode terminal 30 is in an unbent state. This embodiment of the present application provides a hard-shell battery 100, comprising a housing 10, an electrode assembly 20, and a first electrode terminal 30. The housing 10 is a hard housing 10, the electrode assembly 20 is disposed within the housing 10, and the first electrode terminal 30 is connected to the electrode assembly 20 and partially disposed outside the housing 10.

[0113] In some embodiments, see Figure 1 andFigure 3 The housing 10 includes a first wall 11, a second wall 12, a third wall 13, a fourth wall 14, a fifth wall 15, and a sixth wall 16. The first wall 11 and the second wall 12 are oppositely arranged along a second direction Y, the third wall 13 and the fourth wall 14 are oppositely arranged along a first direction X, and the fifth wall 15 and the sixth wall 16 are oppositely arranged along a third direction Z. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0114] In some embodiments, the housing 10 can be formed by welding two parts together, and the joint of the two parts is a weld. For example, the housing 10 is formed by welding a steel shell provided with a recess and a cover plate together, the cover plate covers the recess of the steel shell to form a space for accommodating the electrode assembly, and the joint of the steel shell and the cover plate is a weld.

[0115] In some embodiments, the housing 10 is conductive. For example, the material of the housing 10 includes at least one of conductive metals such as steel, aluminum, or iron.

[0116] In some embodiments, referring to Figure 4 The electrode assembly 20 includes a first electrode tab 21, a second electrode tab 22, and a separator 23 arranged between the first electrode tab 21 and the second electrode tab 22, and the separator 23 is used to separate the first electrode tab 21 and the second electrode tab 22.

[0117] In some embodiments, referring to Figure 2 and Figure 4 The first electrode tab 21 includes a first current collector 211 and a first active material layer 212 arranged in a stack.

[0118] In some embodiments, referring to Figure 4 The second electrode tab 22 includes a second current collector 221 and a second active material layer 222 arranged in a stack.

[0119] In some embodiments, the first current collector 211 is a cathode current collector, the second current collector 221 is an anode current collector, the first active material layer 212 is a cathode active material layer, and the second active material layer 222 is an anode active material layer.

[0120] In other embodiments, the first current collector 211 is an anode current collector, the second current collector 221 is a cathode current collector, the first active material layer 212 is an anode active material layer, and the second active material layer 222 is a cathode active material layer.

[0121] The cathode current collector can be a metal layer including at least one of aluminum, nickel, tantalum, and titanium, such as an aluminum foil. The anode current collector can be a metal layer including at least one of copper, nickel, tantalum, and titanium, such as a copper foil. The cathode active material layer includes a cathode active material, which can include at least one of lithium cobaltate, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, lithium iron phosphate, lithium manganese iron phosphate, or lithium manganate. The anode active material layer includes an anode active material, which can include at least one of graphite, hard carbon, soft carbon, silicon, silicon-oxygen material, and silicon-carbon material.

[0122] In some embodiments, the separation film 23 is a polyethylene film, a polypropylene film, a polyester film, or a polyimide film, or the like, which is an insulating film.

[0123] In some embodiments, the first electrode tab 21, the second electrode tab 22, and the separation film 23 are stacked to form a stacked structure.

[0124] In some other embodiments, the first electrode tab 21, the second electrode tab 22, and the separation film 23 are stacked and wound to form a wound structure.

[0125] In some embodiments, referring to Figure 2 and Figure 4 at least part of the first electrode terminal 30 is located on one side of the electrode assembly 20 along the first direction X, the first electrode terminal 30 includes a first tab group 31, the first tab group 31 includes a plurality of first tabs 31a stacked together, the first tabs 31a are connected to the first electrode tab 21, and the polarity of the first tabs 31a is the same as that of the first electrode tab 21.

[0126] In some embodiments, the first tabs 31a are connected to the first electrode tab 21 by welding. In some other embodiments, the first tabs 31a are formed by cutting the first current collector 211.

[0127] In some embodiments, the material of the first tabs 31a can be the same as or different from that of the first electrode tab 21, which is not specifically limited herein.

[0128] In some embodiments, referring to Figure 2 to Figure 4 the first electrode terminal 30 further includes a first adapter 32, the first adapter 32 is connected to the first tab group 31, and the polarity of the first adapter 32 is the same as that of the first tabs 31a. At least part of the first adapter 32 is located outside the housing 10, or the first adapter 32 is connected to a conductive structure located partially outside the housing 10 to lead the polarity of the first electrode tab 21 out of the housing 10.

[0129] In some embodiments, the material of the first adapter 32 can be the same as or different from that of the first tabs 31a, which is not specifically limited herein.

[0130] In some other embodiments, a portion of the first electrode tab group 31 directly extends out of the housing 10 to lead the polarity of the first electrode piece 21 out of the housing 10 .

[0131] In some embodiments, see Figure 2 , Figure 2 The second electrode terminal 40 is in an unbent state. The hard-shell battery 100 further includes a second electrode terminal 40, which includes a second electrode tab assembly 41. The second electrode tab assembly 41 includes a plurality of stacked second electrode tabs 411. The second electrode tabs 411 are connected to the second electrode sheet 22, and the polarity of the second electrode tabs 411 is the same as that of the second electrode sheet 22.

[0132] In some embodiments, the second electrode tab 411 is connected to the second electrode sheet 22 by welding. In other embodiments, the second electrode tab 411 is formed by cutting the second current collector 221.

[0133] In some embodiments, the material of the second electrode tab 411 may be the same as or different from that of the second electrode piece 22 , which is not specifically limited herein.

[0134] In some embodiments, see Figure 2 and Figure 4 The second electrode terminal 40 further includes a second adapter 42, which is connected to the second tab group 41. The polarity of the second adapter 42 is the same as that of the second tab 411. At least a portion of the second adapter 42 is located outside the housing 10, or the second adapter 42 is connected to a conductive structure partially located outside the housing 10, so as to lead the polarity of the second electrode piece 22 outside the housing 10.

[0135] In some embodiments, the material of the second adapter 42 may be the same as the material of the second tab 411 , or the material of the second adapter 42 may be different from the material of the second tab 411 , which is not specifically limited here.

[0136] In some other embodiments, a portion of the second electrode tab group 41 directly extends out of the housing 10 to lead the polarity of the second electrode piece 22 out of the housing 10 .

[0137] In some embodiments, see Figure 2 , at least a portion of the second electrode terminal 40 is located on one side of the electrode assembly 20 along the first direction X.

[0138] In some embodiments, see Figure 3 and Figure 5The hard-shell battery 100 further comprises a first insulating piece 50, which is disposed on one side of the first electrode terminal 30 along the second direction Y and is in contact with both the first tab group 31 and the shell 10. The first direction X is perpendicular to the second direction Y, and the second direction Y is parallel to the thickness direction of the electrode assembly 20.

[0139] In consideration of the impact resistance, cost, processing, and other factors of the battery, the shell 10 of the hard-shell battery 100 is made of a conductive metal material. In the case of extreme conditions such as impact on the hard-shell battery 100, the first tab group 31 and the second tab group 41 may shift, and the first tab 31a may be damaged when the first tab group 31 shifts. When the first tab group 31 and the second tab group 41 shift, the conductive shell 10 may come into contact with the first tab group 31 and the second tab group 41 with different polarities, thereby causing a short circuit of the hard-shell battery 100 or a risk of electrification of the shell 10. The first insulating piece 50 is disposed on one side of the first tab group 31 along the second direction Y, which reduces the gap between the first tab group 31 and the shell 10 along the second direction Y, thereby helping to suppress the shift of the first tab group 31 and reducing the risk of damage to the first tab 31a. The first insulating piece 50 also reduces the possibility of contact between the first tab group 31 and the shell 10, thereby reducing the risk of a short circuit of the hard-shell battery 100 and electrification of the shell 10, and improving the safety and reliability of the hard-shell battery 100.

[0140] In some embodiments, referring to Figure 3 and Figure 5 , the first tab group 31 comprises a first aggregation segment 311, a first bending segment 312, and a first connecting segment 313 arranged in sequence. The first aggregation segment 311 is connected to the electrode assembly 20, and the first connecting segment 313 extends along the second direction Y. Along the second direction Y, the shell 10 comprises a first wall 11 and a second wall 12 arranged oppositely, and the first insulating piece 50 is in contact with both the first tab group 31 and the first wall 11. Along the second direction Y, the distance between the first bending segment 312 and the first wall 11 is less than the distance between the first bending segment 312 and the second wall 12. Along the second direction Y, the projection of the first bending segment 312 overlaps the projection of the first insulating piece 50.

[0141] Figure 3The first lug group 31 is bent. After the first lug group 31 is bent and forms the first bent segment 312, the distance between the first bent segment 312 and the shell 10 is closer than other parts of the first lug group 31, and the first bent segment 312 is more likely to contact the shell 10. In the second direction Y, the projection of the first bent segment 312 overlaps the projection of the first insulating piece 50, which is conducive to the first insulating piece 50 abutting the first bent segment 312 when the hard-shell battery 100 is impacted, thereby helping to suppress the shaking of the first lug group 31, and on the other hand, the first insulating piece 50 blocks the first bent segment 312 from contacting the shell 10, thereby reducing the risk of short circuit caused by the first bent segment 312 contacting the shell 10.

[0142] It should be noted that the plurality of first lugs 31a are stacked and aggregated, and the aggregated plurality of first lugs 31a form the first aggregated segment 311, the first bent segment 312, and the first connecting segment 313 arranged in sequence. In the extension direction of the aggregated plurality of first lugs 31a, the distance between the first aggregated segment 311 and the electrode assembly 20 is less than the distance between the first bent segment 312 and the electrode assembly 20.

[0143] In some embodiments, referring to Figure 3 and Figure 5 , the hard-shell battery 100 further includes a second insulating piece 60, which is arranged on the side of the first electrode terminal 30 away from the first insulating piece 50 in the second direction Y, and the second insulating piece 60 contacts both the first lug group 31 and the second wall 12.

[0144] The second insulating piece 60 is arranged on the side of the first electrode terminal 30 away from the first insulating piece 50, and the second insulating piece 60 contacts both the first lug group 31 and the second wall 12, further reducing the gap between the first lug group 31 and the shell 10 in the second direction Y, which is conducive to suppressing the shaking of the first lug group 31 and reducing the risk of damage to the first lug 31a. The second insulating piece 60 further reduces the possibility of the first lug group 31 contacting the shell 10, which is conducive to reducing the risk of short circuit of the hard-shell battery 100 or electrification of the shell 10, thereby further improving the safety and reliability of the hard-shell battery 100.

[0145] In some embodiments, referring to Figure 3 and Figure 5 , Figure 5The first adapter 32 in the first electrode terminal 30 is bent. The first electrode terminal 30 includes the first adapter 32, the first adapter 32 includes a second connecting segment 321, a second bent segment 322 and a third connecting segment 323 arranged in sequence, the second connecting segment 321 is connected with the first connecting segment 313, the second bent segment 322 is opposite to the bending direction of the first bent segment 312, along the first direction X, and the third connecting segment 323 is located on the side of the first connecting segment 313 away from the first aggregation segment 311. Along the second direction Y, the distance between the second bent segment 322 and the second wall 12 is less than the distance between the second bent segment 322 and the first wall 11. Along the second direction Y, the projection of the second bent segment 322 overlaps the projection of the second insulating piece 60.

[0146] After the first adapter 32 is bent and the second bent segment 322 is formed, compared with other parts of the first adapter 32, the distance between the second bent segment 322 and the shell 10 is closer, and the risk of the second bent segment 322 contacting the shell 10 is higher. Along the second direction Y, the projection of the second bent segment 322 overlaps the projection of the second insulating piece 60, which is beneficial on the one hand for allowing the second insulating piece 60 to abut against the first bent segment 312 when the hard-shell battery 100 is impacted, thereby facilitating the suppression of the shaking of the first tab group 31, and on the other hand, the second insulating piece 60 plays a role in blocking the second bent segment 322 from contacting the shell 10, thereby facilitating the reduction of the risk of short circuit caused by the second bent segment 322 contacting the shell 10.

[0147] In some embodiments, referring to Figure 3 and Figure 5 , along the first direction X, the shell 10 includes a third wall 13 and a fourth wall 14 arranged oppositely. Along the first direction X, the distance between the first electrode terminal 30 and the third wall 13 is less than the distance between the first electrode terminal 30 and the fourth wall 14. Along the first direction X, the distance between the first insulating piece 50 and the third wall 13 is L1, which satisfies L1≥0.1mm. When L1≥0.1mm is satisfied, it is beneficial to reduce the risk of interference between the first insulating piece 50 and the shell 10, and facilitate the packaging of the shell 10.

[0148] As an exemplary example, L1 can be any one of 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm, or any value between any two of them.

[0149] In some embodiments, referring to Figure 5 to Figure 8The first tab 21 has a first region 21a and a second region 21b connected to each other. In the first direction X, the first region 21a is closer to the first electrode terminal 30 than the second region 21b, and the first active material layer 212 of the first region 21a has a smaller thickness than the first active material layer 212 of the second region 21b. The first insulating member 50 includes a first portion 51 and a second portion 52 arranged in the first direction X. In the second direction Y, the first portion 51 is located between the shell 10 and the electrode assembly 20, and a projection of the first portion 51 is located in the first region 21a. The second portion 52 is located between the shell 10 and the first tab group 31.

[0150] The first active material layer 212 of the first region 21a has a smaller thickness than the first active material layer 212 of the second region 21b, so that in the formation process, the first region 21a is less likely to be pressed than the second region 21b, which leads to insufficient formation of the SEI (solid electrolyte interface) film and is not conducive to improving the interface performance of the electrode assembly 20. In the second direction Y, the first portion 51 of the first insulating member 50 is located between the shell 10 and the electrode assembly 20, and a projection of the first portion 51 is located in the first region 21a. The second portion 52 is located between the shell 10 and the first tab group 31, which is conducive to allowing the first insulating member 50 to suppress the shaking of the first tab group 31, reduce the risk of short circuit of the hard-shell battery 100 and charging of the shell 10, and also conducive to making up for the thickness of the first region 21a with a relatively small thickness and improving the uniformity of the pressure on the electrode assembly 20, thereby improving the interface performance of the electrode assembly 20.

[0151] In some embodiments, referring to Figure 5 to Figure 8 In the first direction X, the shell 10 includes a third wall 13 and a fourth wall 14 arranged opposite to each other. The first electrode terminal 30 is closer to the third wall 13 than to the fourth wall 14. The thickness of the first active material layer 212 of the first region 21a gradually decreases from the fourth wall 14 to the third wall 13. The thickness of the first portion 51 gradually increases from the fourth wall 14 to the third wall 13, and the first portion 51 is in contact with the electrode assembly 20.

[0152] The portion of the electrode assembly 20 corresponding to the first region 21a has a relatively small thickness and changes with the thickness of the active material layer of the first region 21a. The thickness of the first portion 51 gradually increases from the fourth wall 14 to the third wall 13, which is conducive to the adhesion of the first portion 51 and the portion of the electrode assembly 20 with a relatively small thickness, thereby making up for the thickness of the first region 21a and improving the uniformity of the pressure on the electrode assembly 20, which is conducive to improving the interface performance of the electrode assembly 20.

[0153] In some embodiments, referring to Figure 5 to Figure 8The first portion 51 has an inclined surface 511 in contact with the first region 21a, the inclined surface 511 having a slope K satisfying 0.005≤K≤0.14.

[0154] When K satisfies 0.005≤K≤0.14, the first portion 51 and the portion of the electrode assembly 20 with a relatively small thickness are favorably fitted, thereby favorably compensating for the thickness of the first region 21a, improving the uniformity of the pressure applied to the electrode assembly 20, and favorably improving the interface performance of the electrode assembly 20.

[0155] The slope K of the inclined surface 511 is calculated as follows:

[0156] The thickness of the portion of the electrode assembly 20 corresponding to the first region 21a is M, i.e., the size of M shown in Figure 7 The width of the portion of the electrode assembly corresponding to the first region 21a is N, i.e., the size of N shown in Figure 7 The slope K of the inclined surface 511 is M / N.

[0157] As an exemplary example, K can be any one of 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.11, 0.12, 0.13, or 0.14, or any value between any two of them.

[0158] As an exemplary example, M can be any one of 50um, 60um, 70um, 80um, 90um, 100um, 110um, 120um, 130um, 140um, 150um, 160um, 170um, 180um, 190um, 200um, 210um, 220um, 230um, 240um, 250um, 260um, 270um, 280um, 290um, 300um, 310um, 320um, 330um, 340um, 350um, 360um, 370um, 380um, 390um, or 400um, or any value between any two of them.

[0159] As an exemplary example, N can be any one of 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, or 10mm, or any value between any two of them.

[0160] In some embodiments, referring to Figure 8 In the first direction X, the length of the first portion 51 is L2, satisfying 2.5mm≤L2≤10.5mm.

[0161] When L2 satisfies 2.5mm≤L2≤10.5mm, on the one hand, the first part 51 will not be too long to exceed the first area 21a along the first direction X, which is conducive to reducing the occupied space of the first insulating piece 50, on the other hand, the first part 51 will not be too short, which is conducive to improving the comprehensiveness of the first insulating piece 50 to make up the thickness of the first area 21a, thereby improving the uniformity of the electrode assembly 20 under pressure and improving the interface performance of the electrode assembly 20.

[0162] As an exemplary example, L2 can be any one of 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm or 10.5mm, or any value between them.

[0163] In some embodiments, referring to Figure 8 , along the first direction X, the length of the second part 52 is L3, which satisfies 0.1mm≤L3≤0.3mm.

[0164] When L3 satisfies 0.1mm≤L3≤0.3mm, on the one hand, the second part 52 will not be too long to interfere with the shell 10, which is conducive to the packaging of the shell 10, on the other hand, the second part 52 will not be too short, which is conducive to the projection of the second part 52 along the second direction Y and the projection of the first bending section 312 along the second direction Y There is an overlap, thereby facilitating the first insulating piece 50 to abut against the first bending section 312 when the hard-shell battery 100 is impacted, which is conducive to inhibiting the shaking of the first tab group 31 and reducing the risk of short circuit caused by the contact between the first bending section 312 and the shell 10.

[0165] As an exemplary example, L3 can be any one of 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.29mm or 0.3mm, or any value between them.

[0166] In some embodiments, referring to Figure 8 , along the third direction Z, the first part 51 has oppositely arranged first and second edges 512 and 513, and along the second direction Y, the projection of the first area 21a on the first insulating piece 50 is located between the first and second edges 512 and 513.

[0167] In the second direction Y, the projection of the first region 21a on the first insulating piece 50 is located between the first edge 512 and the second edge 513, which is conducive to the first insulating piece 50 extending beyond the electrode assembly 20 in the third direction Z, and is conducive to suppressing the warping of the edges of the first and second electrode sheets 21 and 22 in the third direction Z in the electrode assembly 20.

[0168] In some embodiments, referring to Figure 9 In the third direction Z, the housing 10 comprises a fifth wall 15 and a sixth wall 16 arranged opposite to each other. In the third direction Z, the fifth wall 15 is closer to the first edge 512 than to the second edge 513. The distance between the first edge 512 and the fifth wall 15 is D1, and the distance between the second edge 513 and the sixth wall 16 is D2, satisfying 0.1mm≤D1≤1.5mm and 0.1mm≤D2≤1.5mm.

[0169] When 0.1mm≤D1≤1.5mm and 0.1mm≤D2≤1.5mm are satisfied, on the one hand, the distance between the first portion 51 and the fifth and sixth walls 15 and 16 is not too small, which is conducive to the installation of the electrode assembly 20 and the first insulating piece 50, and reduces the occupied space of the first insulating piece 50. On the other hand, the first portion 51 is not too short, which is conducive to the first insulating piece 50 extending beyond the electrode assembly 20 in the third direction Z, thereby being conducive to suppressing the warping of the edges of the first and second electrode sheets 21 and 22 in the third direction Z in the electrode assembly 20.

[0170] In some embodiments, in the second direction Y, the overlapping area of the first portion 51 and the first region 21a accounts for 80%-100% of the area of the first region 21a, which is conducive to improving the comprehensiveness of the first insulating piece 50 in making up the thickness of the first region 21a, thereby being conducive to improving the uniformity of the electrode assembly 20 under pressure and the interface performance of the electrode assembly 20.

[0171] As an exemplary example, the percentage of the overlapping area of the first region 21a to the area of the first region 21a is S, which can be any one of 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100%, or any value between any two of them.

[0172] In order to verify the influence of the first insulating piece 50 on the short circuit and interface performance of the hard-shell battery 100, the following tests were conducted:

[0173] A battery cycle test is performed on the hard-shell battery 100: the hard-shell battery 100 is left to stand in an environment of 55°C for 30 minutes, and then subjected to charge and discharge in the following steps. Constant current charging at 2.5C to 4.2V, and then constant voltage charging at 0.5C; then constant current charging at 0.5C to 4.45V, and then constant voltage charging at 0.02C; standing for 5 minutes, constant current discharging at 1C to 3V, and standing for 5 minutes, which is one cycle. The cycle is repeated 300 times according to the above cycle steps, and the hard-shell battery 100 is disassembled to observe whether the electrode assembly 20 produces black spots or lithium precipitation. If black spots or lithium precipitation occurs, the test is failed, otherwise the test is passed.

[0174] A battery drop test is performed on the hard-shell battery 100: the hard-shell battery 100 is pre-treated at 25°C, left to stand in a normal temperature environment for 60 minutes, and then the resistance and voltage of the hard-shell battery 100 before the drop test are measured; the hard-shell battery 100 is loaded into a fixture, and then dropped freely from a position 2m away from the ground in the following order: head-tail-head right corner-tail right corner-head left corner-tail left corner (angle: 45±15°), repeated for 10 rounds. After the drop, the internal resistance of the hard-shell battery 100 is measured, and if the internal resistance increases to more than 20Ω, it is determined that the test is failed. After the drop, 96 hours of voltage monitoring is also required, and the voltage is measured once every 24 hours, a total of 4 times. If the voltage drop of any one time is more than 10mV, it is determined that there is an internal short circuit failure, and the test is failed, and the battery needs to be disassembled to confirm the short circuit point. After the drop, the hard-shell battery 100 is disassembled, and whether all the first tabs 31a are damaged is observed. If one or more first tabs 31a are damaged, the test is failed. In addition, if the weld cracks after the drop, the test is also failed. If after the drop, no first tab 31a is damaged, the internal resistance is not more than 20Ω, the voltage of each voltage test is less than or equal to 10mV, and the weld is not cracked, the test is passed.

[0175] In the above two tests, 100 hard-shell batteries 100 are tested for each example or comparative example, each hard-shell battery 100 has a length of 90mm, a width of 48mm, and a thickness of 5.1mm, and the pass rate = (number of passes / 100) x 100%.

[0176] The specific embodiments of the hard-shell battery 100 in the examples and comparative examples are described below.

[0177] Example 1:

[0178] A hard-shell battery 100 is assembled in the following process:

[0179] (1) Preparation of the anode electrode sheet: Artificial graphite, conductive carbon black (Super P), and butadiene-styrene rubber (SBR) were mixed in a weight ratio of 96:1.5:2.5, deionized water was added as a solvent, and a slurry with a weight percentage of 70wt% was prepared and stirred uniformly. The slurry was uniformly coated on one surface of a copper foil with a thickness of 10μm as the anode current collector, and an empty foil area was reserved at the edge of the copper foil. The coated copper foil was dried at 110°C to obtain an anode electrode sheet with a single-sided anode active material layer with a coating thickness of 150μm. The above steps were repeated on the other surface of the anode electrode sheet to obtain an anode electrode sheet with a coating area and an empty foil area. The anode electrode sheet was welded with an anode tab at the empty foil area at one end of the anode electrode sheet.

[0180] (2) Preparation of the cathode electrode sheet: Lithium cobalt oxide (LiCoO2), conductive carbon black (Super P), and polyvinylidene fluoride (PVDF) were mixed in a weight ratio of 97.5:1.0:1.5, N-methyl pyrrolidone (NMP) was added as a solvent, and a slurry with a solid content of 75wt% was prepared and stirred uniformly. The slurry was uniformly coated on one surface of an aluminum foil with a thickness of 12μm as the cathode current collector, an empty foil area was reserved on the aluminum foil, and the coated aluminum foil was then dried at 90°C to obtain a cathode electrode sheet with a cathode active material layer with a thickness of 100μm. The above coating steps were repeated on the other surface of the aluminum foil to obtain a cathode electrode sheet, and the cathode electrode sheet was welded with a cathode tab at the empty foil area.

[0181] (3) Preparation of the electrolyte: In a dry argon atmosphere, first, ethylene carbonate (EC), methyl ethyl carbonate (EMC), and diethyl carbonate (DEC) were mixed in a mass ratio of EC:EMC:DEC=30:50:20 to form a base organic solvent, and then lithium salt lithium hexafluorophosphate (LiPF6) was added to the base organic solvent to dissolve and mix uniformly to obtain an electrolyte with a lithium salt concentration of 1.15mol / L.

[0182] (4) Preparation of the separator film 23: The separator film 23 adopts a three-layer structure, which includes a first adhesive layer, a first substrate layer, and a first adhesive layer stacked in sequence. The first substrate layer is made of polyethylene (PE), the first adhesive layer contains a first adhesive, and the first adhesive layer further contains boehmite.

[0183] (5) Preparation of the electrode assembly 20: The cathode electrode sheet, the separator film 23, and the anode electrode sheet were stacked and formed into a stacked structure. A plurality of cathode tabs were stacked and aggregated to form a cathode tab group, and the cathode tab group was bent along the thickness direction of the electrode assembly 20. A plurality of anode tabs were stacked and aggregated to form an anode tab group, and the anode tab group was bent along the thickness direction of the electrode assembly 20.

[0184] (6) Preparation of the shell 10: stamping a steel shell with a recess and a cover, forming a protruding structure 51a on the inner side wall in the thickness direction of the steel shell, coating an insulating part 51b made of insulating resin on the structure 51a, and forming the structure 51a and the insulating part 51b into the first insulating part 50.

[0185] (7) Assembly of the electrode assembly 20: assembling the steel shell into a steel shell assembly jig, placing the electrode assembly 20 into the steel shell, and placing the first insulating part 50 on one side of the cathode tab group in the thickness direction of the electrode assembly 20, so that the first insulating part 50 contacts the cathode tab group. Then, the cover is sealed to the steel shell, and the steel shell is connected to the cover by welding.

[0186] (8) Liquid injection packaging: injecting electrolyte into the shell 10 through the liquid injection hole damaged by the cover, and after packaging, standing, and formation, a hard-shell battery 100 is obtained.

[0187] Comparative Example 1: The difference between the example and the comparative example is that the first insulating part 50 is not provided in the comparative example.

[0188] Examples 2-29: The only difference between Example 1 and Examples 2-29 is the parameter shown in Table 1, and the others remain the same.

[0189] The main parameter control and test results of each example and comparative example are shown in Table 1:

[0190] Table 1

[0191]

[0192]

[0193] According to the above Table 1, compared with Comparative Example 1, the first insulating part 50 is provided in Examples 1-29, the first insulating part 50 is provided on one side of the first tab group 31 along the second direction Y, which is beneficial to reduce the risk of damage to the first tab 31a, and also beneficial to reduce the risk of short circuit of the hard-shell battery 100, and beneficial to improve the pass rate of battery cycle test and the pass rate of battery drop. Thus, the safety and reliability of the hard-shell battery 100 are improved.

[0194] According to the above Table 1, compared with Example 2, in Examples 1 and 3, L1≥0.1mm is satisfied, so that the distance between the first insulating part 50 and the third wall 13 along the first direction X is not too close, which is beneficial to reduce the risk of interference at the welding position of the first insulating part 50 and the shell 10, and beneficial to reduce the risk of cracking at the welding position, thereby beneficial to improve the battery drop pass rate.

[0195] According to the above Table 1, compared with Example 4, Examples 1, 5-9 meet L2≥2.5 mm, which is conducive to improving the comprehensiveness of the first insulating piece 50 to compensate for the thickness of the first area 21a, thereby facilitating the improvement of the uniformity of the electrode assembly 20 under pressure, improving the interface performance of the electrode assembly 20, and facilitating the improvement of the battery cycle pass rate.

[0196] According to the above Table 1, compared with Example 10 and Example 15, Examples 1, 11-14 meet 0.1 mm≤L3≤0.3 mm, which on the one hand does not make the second part 52 too long, is conducive to reducing the risk of interference between the second part 52 and the shell 10, and is conducive to reducing the risk of cracking at the welding seal, thereby facilitating the improvement of the battery drop pass rate, and on the other hand is conducive to making the projection of the second part 52 along the second direction Y and the projection of the first bending segment 312 along the second direction Y overlap, thereby facilitating the first insulating piece 50 to abut against the first bending segment 312 when the hard-shell battery 100 is impacted, and facilitating the suppression of the shaking of the first tab group 31, and reducing the risk of short circuit caused by the contact between the first bending segment 312 and the shell 10.

[0197] According to the above Table 1, compared with Example 16 and Example 21, Examples 1, 17-20 meet 0.1 mm≤D1≤1.5 mm and 0.1 mm≤D2≤1.5 mm, which on the one hand does not make the distance between the first part 51 and the fifth wall 15 and the sixth wall 16 too small, is conducive to the installation of the electrode assembly 20 and the first insulating piece 50, is conducive to reducing the gap between the first part 51 and the shell, is conducive to improving the welding area of the shell 10, is conducive to reducing the risk of cracking at the welding seal, thereby facilitating the improvement of the battery drop pass rate, and on the other hand is conducive to making the first insulating piece 50 protrude out of the electrode assembly 20 along the third direction Z, thereby facilitating the suppression of the warping of the edges of the first and second tabs 21 and 22 in the electrode assembly 20 along the third direction Z, and facilitating the improvement of the battery cycle test pass rate.

[0198] According to the above Table 1, compared with Example 22 and Example 29, Examples 1, 21-28 meet 0.005≤K≤0.14, which is conducive to the fit of the first part 51 and the thinner part of the electrode assembly 20, thereby facilitating the compensation for the thickness of the first area 21a, improving the uniformity of the electrode assembly 20 under pressure, improving the interface performance of the electrode assembly 20, and facilitating the improvement of the battery cycle test pass rate.

[0199] In some embodiments, referring to Figure 5 , the first insulating piece 50 includes a structural part 51a integrally arranged with the shell 10 and an insulating part 51b arranged on the surface of the structural part 51a.

[0200] The structure part 51a arranged integrally with the shell 10 is beneficial to the shaping of the first insulating piece 50, and is also beneficial to reducing the risk of the first insulating piece 50 moving in the shell 10 when the hard-shell battery 100 is impacted, beneficial to allowing the first insulating piece 50 to limit the movement of the electrode assembly 20, beneficial to reducing the risk of the weld of the shell 10 cracking, and beneficial to improving the reliability of the hard-shell battery 100.

[0201] In some embodiments, the insulating part 51b can be an insulating material such as ceramic, resin, or the like. The insulating part 51b can be arranged on the structure part 51a by surface coating, spraying, or the like, so that the first insulating piece 50 plays an insulating role.

[0202] In some other embodiments, the first insulating piece 50 is not arranged integrally with the shell 10, and the material of the first insulating piece 50 can be plastic, silica gel, or the like. The first insulating piece 50 can also be a metal structure or a structure with an insulating material arranged on the surface.

[0203] In the embodiments in which the first insulating piece 50 is not arranged integrally with the shell 10, the first insulating piece 50 is connected to the shell 10 by means of adhesive, hot melting, or welding.

[0204] In some embodiments, referring to Figure 2 , the second electrode terminal 40 is located on one side of the electrode assembly 20 along the first direction X, the second electrode terminal 40 includes a second tab group 41, the second tab group 41 includes a plurality of second tabs 411 stacked together, and the second tabs 411 are connected to the second tab 22. Along the second direction Y, the first insulating piece 50 is arranged on one side of the second electrode terminal 40, and the first insulating piece 50 is in contact with both the second tab group 41 and the shell 10.

[0205] Along the second direction Y, the first insulating piece 50 is arranged on one side of the second electrode terminal 40, and the first insulating piece 50 is in contact with both the second tab group 41 and the shell 10, which reduces the gap between the second tab group 41 and the shell 10 along the second direction Y, is beneficial to suppressing the shaking of the second tab group 41, and is beneficial to reducing the risk of damage to the second tabs 411. The first insulating piece 50 also reduces the possibility of the second tab group 41 contacting the shell 10, is beneficial to reducing the risk of short circuit of the hard-shell battery 100 and electrification of the shell 10, and thus improves the safety and reliability of the hard-shell battery 100.

[0206] Embodiments of the second electrode terminal 40 can refer to the above-mentioned embodiments of the first electrode terminal 30. Embodiments between the first insulating member 50 and the second electrode terminal 40 can refer to the above-mentioned embodiments between the first insulating member 50 and the first electrode terminal 30. In the embodiments provided with the second insulating member 60, embodiments of the second insulating member 60 can refer to the above-mentioned embodiments of the first insulating member 50. Embodiments between the second insulating member 60 and the second electrode terminal 40 can refer to the above-mentioned embodiments between the second insulating member 60 and the first electrode terminal 30. Embodiments and advantages of the second electrode terminal 40 will not be repeated here.

[0207] In some embodiments, referring to Figure 10 , the projection of the first insulating member 50 is separated from the second electrode terminal 40 along the second direction Y.

[0208] In some embodiments, the shell 10 is a stainless steel shell, and the first tab 31a is a cathode tab, which is conducive to insulating the shell 10 from the electrode assembly 20 and reducing the risk of short circuit.

[0209] In some embodiments, the shell 10 is an aluminum shell, and the first tab 31a is an anode tab, which is conducive to insulating the shell 10 from the electrode assembly 20 and reducing the risk of short circuit.

[0210] Referring to Figure 11 , the embodiments of the present application also provide an electronic device 1000, which comprises the hard-shell battery 100 of any of the above-mentioned embodiments. Since the electronic device 1000 adopts the technical solutions of the hard-shell battery 100 of any of the above-mentioned embodiments, it at least has the advantages of the technical solutions of the hard-shell battery 100 of any of the above-mentioned embodiments, which will not be repeated here.

[0211] In some embodiments, referring to Figure 11 , the electronic device 1000 further comprises a device body 200, and the hard-shell battery 100 is mounted on the device body 200.

[0212] In some embodiments, the electronic device 1000 can be a mobile phone, a computer, an e-reader, a game console, a wearable electronic device, etc., which will not be listed one by one here.

[0213] In addition, those skilled in the art should understand that the above-mentioned embodiments are only used to illustrate the present application, but not as a limitation on the present application, and any appropriate changes and variations to the above-mentioned embodiments within the spirit and scope of the present application are within the scope of the present application.

Claims

1. A hard shell battery, characterized by, The hard-shell battery comprises: a shell, which is electrically conductive; an electrode assembly arranged in the shell, the electrode assembly comprising a first tab, a second tab, and a separator film arranged between the first tab and the second tab; a first electrode terminal, at least a part of which is located on one side of the electrode assembly along a first direction, the first electrode terminal comprising a first tab group, the first tab group comprising a plurality of first tabs stacked together, the first tabs being connected to the first tab; a first insulating member arranged on one side of the first electrode terminal along a second direction, the first insulating member being in contact with both the first tab group and the shell; the first direction is perpendicular to the second direction, and the second direction is parallel to the thickness direction of the electrode assembly.

2. The hard-shell battery of claim 1, wherein, The first tab group comprises a first polymerization segment, a first bending segment, and a first connecting segment arranged in sequence, the first polymerization segment being connected to the electrode assembly, and the first connecting segment extending along the second direction; along the second direction, the shell comprises a first wall and a second wall arranged oppositely, the first insulating member being in contact with both the first tab group and the first wall, and the distance between the first bending segment and the first wall being smaller than the distance between the first bending segment and the second wall; along the second direction, the projection of the first bending segment overlaps the projection of the first insulating member.

3. The hard-shell battery of claim 2, wherein, The hard-shell battery further comprises a second insulating member arranged on one side of the first electrode terminal away from the first insulating member along the second direction, the second insulating member being in contact with both the first tab group and the second wall.

4. The hard-shell battery of claim 3, wherein, The first electrode terminal further comprises a first adapter, the first adapter comprising a second connecting segment, a second bending segment, and a third connecting segment arranged in sequence, the second connecting segment being connected to the first connecting segment, the second bending segment being opposite to the bending direction of the first bending segment, and the third connecting segment being located on one side of the first connecting segment away from the first polymerization segment along the first direction; along the second direction, the distance between the second bending segment and the second wall is smaller than the distance between the second bending segment and the first wall; along the second direction, the projection of the second bending segment overlaps the projection of the second insulating member.

5. The hard-shell battery of any one of claims 2-4, wherein, along the first direction, the shell comprises a third wall and a fourth wall arranged oppositely, the distance between the first electrode terminal and the third wall being smaller than the distance between the first electrode terminal and the fourth wall; along the first direction, the distance between the first insulating member and the third wall is L1, which satisfies L1≥0.1 mm.

6. The hard-shell battery of claim 1, wherein, The first tab comprises a first current collector and a first active material layer arranged in sequence, the first tab having a first region and a second region connected together, the first region being closer to the first electrode terminal than the second region along the first direction, and the thickness of the first active material layer in the first region being smaller than the thickness of the first active material layer in the second region; The first insulating member comprises a first portion and a second portion arranged along the first direction, along the second direction, the first portion is located between the shell and the electrode assembly, and a projection of the first portion is located in the first region, and the second portion is located between the shell and the first tab group.

7. The hard-shell battery of claim 6, wherein, Along the first direction, the shell comprises a third wall and a fourth wall arranged oppositely, and the distance between the first electrode terminal and the third wall is less than the distance between the first electrode terminal and the fourth wall. The thickness of the first active material layer of the first region gradually decreases along the direction from the fourth wall to the third wall, the thickness of the first portion gradually increases along the direction from the fourth wall to the third wall, and the first portion is in contact with the electrode assembly.

8. The hard-shell battery of claim 7, wherein, The first portion has an inclined surface in contact with the electrode assembly, and the inclined surface has a slope K satisfying 0.005≤K≤0.

14.

9. The hard-shell battery of claim 6, wherein, Along the first direction, the length of the first portion is L2, and 2.5mm≤L2≤10.5mm is satisfied. And / or, the length of the second portion is L3, and 0.1mm≤L3≤0.3mm is satisfied.

10. The hard-shell battery of any one of claims 6-9, wherein, Along the third direction, the first portion has a first edge and a second edge arranged oppositely, and the first direction, the second direction and the third direction are perpendicular to each other. Along the second direction, the projection of the first region on the first insulating member is located between the first edge and the second edge.

11. The hard-shell battery of claim 10, wherein, Along the third direction, the shell comprises a fifth wall and a sixth wall arranged oppositely, and the distance between the fifth wall and the first edge is less than the distance between the fifth wall and the second edge. The distance between the first edge and the fifth wall is D1, and the distance between the second edge and the sixth wall is D2, and 0.1mm≤D1≤1.5mm and 0.1mm≤D2≤1.5mm are satisfied.

12. The hard-shell battery of any one of claims 6-9, wherein, Along the second direction, the overlapping area of the first portion and the first region accounts for 80%-100% of the area of the first region.

13. The hard-shell battery of any one of claims 1-12, wherein, The first insulating member comprises a structure part integrally arranged with the shell and an insulating part arranged on the surface of the structure part.

14. The hard-shell battery of any one of claims 1-13, wherein, The hard-shell battery further comprises a second electrode terminal located on one side of the electrode assembly along the first direction, the second electrode terminal comprises a second tab group, the second tab group comprises a plurality of second tabs stacked, and the second tabs are connected with the second tab piece; Along the second direction, the first insulating member is arranged on one side of the second electrode terminal, and the first insulating member is in contact with the second tab group and the shell.

15. The hard-shell battery of claim 1, wherein, The shell is a stainless steel shell, and the first tab is a cathode tab. Or, the shell is an aluminum shell, and the first tab is an anode tab.

16. An electronic device, comprising: The hard-shell battery comprises the hard-shell battery as claimed in any one of claims 1 to 15.

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