Battery and electric equipment

Abstract

The utility model provides a battery and electric equipment. The battery comprises a shell, a connecting piece and a packaging part, the shell is provided with an inward shrinkage part, the inward shrinkage part protrudes towards the inner space of the shell, the connecting piece is connected with the surface, facing the inner space of the shell, of the inward shrinkage part and the tab, and at least part of the packaging part is arranged at the joint of the connecting piece and the inward shrinkage part. According to the battery disclosed by the invention, impurities can be prevented from entering the connecting part of the connecting piece and the inward shrinkage part, the influence of the impurities on the connecting strength of the connecting piece and the inward shrinkage part is avoided, and the connecting stability of the connecting piece and the inward shrinkage part is improved, so that the connecting piece can be stably connected with the shell and the tab, and the connecting stability between the tab and the shell is further improved.

Description

[0001] Cross-reference to related applications

[0002] This application requires filing with the Chinese Patent Office on December 9, 2024, application number [Application Number Missing].

[0003] Priority is claimed in Chinese patent application No. 202423033318.8, the entire contents of which are incorporated herein by reference. Technical Field

[0004] This application relates to the field of battery technology, specifically to batteries and electrical equipment. Background Technology

[0005] Batteries are widely used in energy storage systems, transportation, and consumer electronics. The battery terminals and the battery casing need to be connected together by a connecting structure.

[0006] In related technologies, the stability of the connection between the battery tabs and the battery casing still needs to be improved. Utility Model Content

[0007] Embodiments of this application provide a battery and electrical device that can improve the technical problem of insufficient stability in the connection between the casing and the electrode tabs.

[0008] In a first aspect, embodiments of this application provide a battery, comprising:

[0009] The housing has a recessed portion that protrudes into the interior space of the housing.

[0010] A connector connects the surface of the recessed portion facing the interior space of the housing to the tab;

[0011] The encapsulation portion, at least a portion of which is located at the connection between the connector and the recessed portion.

[0012] In one embodiment, the connector includes an electrode connector and a tab connector connected in sequence, the electrode connector being connected to the recessed portion, and the tab connector being connected to the tab.

[0013] In one embodiment, the encapsulation portion is provided at least a portion of the electrode connectors; and / or, the encapsulation portion is provided at least a portion of the tab connectors.

[0014] In one embodiment, the first end of the electrode connector is connected to the tab connector, and the second end of the electrode connector is connected to the recessed portion and spaced apart from the tab connector.

[0015] In an embodiment, the battery further comprises an electrode assembly, the housing is formed with a mounting cavity, the electrode assembly is arranged in the mounting cavity, and the connecting member is arranged at one side of the inwardly-recessed portion.

[0016] At least part of the electrode connecting member is connected to the side of the inwardly-recessed portion facing the electrode assembly; and / or,

[0017] At least part of the electrode connecting member is connected to the side of the inwardly-recessed portion away from the electrode assembly.

[0018] In an embodiment, the connection position of the electrode connecting member and the tab connecting member and the connection position of the electrode connecting member and the housing are located at different sides of the electrode connecting member.

[0019] In an embodiment, the connection between the electrode connecting member and the inwardly-recessed portion is provided with the encapsulation portion.

[0020] In an embodiment, the housing comprises a housing body and the inwardly-recessed portion, and the inwardly-recessed portion is connected to the housing body.

[0021] Along the radial direction of the housing, at least part of the electrode connecting member protrudes from the tab connecting member and is connected to the housing body.

[0022] In an embodiment, an included angle is formed between the side of the inwardly-recessed portion facing the electrode assembly and the housing body, and the included angle is between 0 degrees and 150 degrees.

[0023] In an embodiment, the minimum distance between the tab connecting member and the inwardly-recessed portion is greater than 0.05 mm.

[0024] In an embodiment, the electrode connecting member comprises a first connecting segment and a second connecting segment connected in sequence, the first connecting segment is connected to the tab connecting member, and the second connecting segment is connected to the inwardly-recessed portion.

[0025] In an embodiment, an encapsulation portion is arranged between the first connecting segment and the second connecting segment, a first end of the encapsulation portion extends along the surface of the first connecting segment and is connected to the second connecting segment, and a second end of the encapsulation portion extends along the surface of the first connecting segment and is connected to the tab connecting member.

[0026] In an embodiment, along the axial direction of the housing, the height of the contact position of the encapsulation portion and the second connecting segment is A9, and A9≥0.1 mm.

[0027] In an embodiment, along the radial direction of the housing, the length of the contact position of the encapsulation portion and the tab connecting member is A7, and A7≥0.3 mm.

[0028] In an embodiment, a first end of the first connecting segment is stacked on the tab connecting piece, and a second end of the first connecting segment protrudes or is bent away from the first end of the first connecting segment and away from the tab connecting piece.

[0029] In an embodiment, at least part of the first connecting segment protrudes from the tab connecting piece and connects with the sidewall of the shell along the radial direction of the shell.

[0030] In an embodiment, the first connecting segment protrudes from the part of the shell, the tab connecting piece, and the sidewall of the shell to form an accommodation space for accommodating the encapsulation part.

[0031] In an embodiment, the shell comprises a shell body and the inwardly-retracted part connected to the shell body.

[0032] The second connecting segment comprises a first connecting segment and a second connecting segment connected in sequence, the first connecting segment is connected with the first connecting segment, and the second connecting segment is connected with the inwardly-retracted part, the first connecting segment is connected to the shell body, and the second connecting segment is connected to the inwardly-retracted part.

[0033] In an embodiment, the electrode connecting piece further comprises a third connecting segment connecting the first connecting segment and the second connecting segment.

[0034] In an embodiment, the third connecting segment is spaced apart from the shell.

[0035] In an embodiment, a first end of the third connecting segment is connected with the first connecting segment, a second end of the third connecting segment is bent towards the first connecting segment relative to the first end of the third connecting segment, and an encapsulation part is arranged between the second end of the third connecting segment and the first connecting segment.

[0036] In an embodiment, a first end of the third connecting segment is connected with the first connecting segment, a second end of the third connecting segment is connected with the second connecting segment, and along the direction away from the tab connecting piece, the second end of the third connecting segment extends to and abuts against the sidewall surface of the shell.

[0037] In an embodiment, the length of the third connecting segment along the radial direction of the shell is C8, and C8≥0.5mm.

[0038] In an embodiment, the second connecting segment is spaced apart from the tab connecting piece.

[0039] In an embodiment, the shortest distance between the second connecting segment and the tab connecting piece is B8, and B8≥0.1mm.

[0040] In an embodiment, an end surface of the first connecting section close to the side wall of the shell is flush with an end surface of the tab connecting piece close to the side wall of the shell.

[0041] A side of the third connecting section away from the second connecting section is provided with the encapsulation part between the tab connecting piece and the third connecting section, and the tab connecting piece and the third connecting section are connected with the encapsulation part at the same time.

[0042] In an embodiment, a contact size of the encapsulation part with the third connecting section is C5, and C5≥0.3mm.

[0043] In an embodiment, the tab connecting piece includes a first tab connecting piece and a second tab connecting piece, the first tab connecting piece is connected to an end of the second tab connecting piece, the second tab connecting piece is used for connecting the tab, and the electrode connecting piece is connected to a side of the first tab connecting piece away from the second tab connecting piece.

[0044] In an embodiment, the first tab connecting piece, the electrode connecting piece and the shell enclose an accommodation space, and the accommodation space is used for accommodating the encapsulation part.

[0045] In an embodiment, a first end of the first tab connecting piece is connected with the second tab connecting piece, and a second end of the first tab connecting piece extends in a direction towards the retracted part to protrude from the second tab connecting piece.

[0046] In an embodiment, an end of the first tab connecting piece away from the second tab connecting piece is provided with the encapsulation part at a connection position with the electrode connecting piece.

[0047] In an embodiment, a first end of the encapsulation part extends along the first tab connecting piece, and a second end of the encapsulation part extends along the electrode connecting piece.

[0048] In an embodiment, the first tab connecting piece is formed with an accommodation groove, part of the electrode connecting piece is located in the accommodation groove, and another part of the electrode connecting piece protrudes from the accommodation groove to be connected with the shell.

[0049] In an embodiment, the first tab connecting piece is a bent structure.

[0050] In an embodiment, the first tab connecting piece is provided with the encapsulation part at a bent position.

[0051] In an embodiment, the first tab connecting piece includes oppositely arranged first and second ends, the first end of the first tab connecting piece is connected with the second tab connecting piece, and the second end of the first tab connecting piece is arranged to be bent relative to the first end of the first tab connecting piece.

[0052] In an embodiment, the first end of the first tab connector is provided with the encapsulation portion between the side wall of the shell; and / or, the second end of the first tab connector is provided with the encapsulation portion between the inner retraction portion.

[0053] In an embodiment, the first tab connector, the electrode connector and the inner retraction portion have the same bending angle.

[0054] In an embodiment, the tab connector and the electrode connector are integrally formed.

[0055] In a second aspect, embodiments of the present application provide a battery, comprising the battery as described above.

[0056] The beneficial effects of embodiments of the present application are as follows:

[0057] In embodiments of the present application, by providing the encapsulation portion at the connection between the connector and the inner retraction portion, the encapsulation portion can prevent impurities from entering the connection between the connector and the inner retraction portion, avoid the impurities affecting the connection strength of the connector and the inner retraction portion, improve the connection stability of the connector and the inner retraction portion, so that the connector can stably connect the shell and the tab, and further improve the connection stability between the tab and the shell. BRIEF DESCRIPTION OF DRAWINGS

[0058] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0059] Figure 1 is one of the structural schematic diagrams of the battery provided by the embodiments of the present application;

[0060] Figure 2 is one of the partial structural schematic diagrams of the battery provided by the embodiments of the present application;

[0061] Figure 3 is the structural schematic diagram of the battery provided by the embodiments of the present application Figure 2 after the structure shown in the figure is formed;

[0062] Figure 4 is the second structural schematic diagram of the battery provided by the embodiments of the present application;

[0063] Figure 5 is the second partial structural schematic diagram of the battery provided by the embodiments of the present application;

[0064] Figure 6 is the structural schematic diagram of the battery provided by the embodiments of the present applicationFigure 5 Structure after the structure shown is formed.

[0065] Figure 7 Part structure schematic diagram of a battery provided by an embodiment of the present application;

[0066] Figure 8 Part structure schematic diagram of a battery provided by an embodiment of the present application Figure 7 Structure after the structure shown is formed.

[0067] Figure 9 Part structure schematic diagram of a battery provided by an embodiment of the present application;

[0068] Figure 10 Part structure schematic diagram of a battery provided by an embodiment of the present application Figure 9 Structure after the structure shown is formed.

[0069] Figure 11 Part structure schematic diagram of a battery provided by an embodiment of the present application;

[0070] Figure 12 Part structure schematic diagram of a battery provided by an embodiment of the present application;

[0071] Figure 13 Part structure schematic diagram of a battery provided by an embodiment of the present application Figure 12 Structure after the structure shown is formed.

[0072] Figure 14 Part structure schematic diagram of a battery provided by an embodiment of the present application

[0073] Figure 15 Part structure schematic diagram of a battery provided by an embodiment of the present application

[0074] Figure 16 Part structure schematic diagram of a battery provided by an embodiment of the present application

[0075] Figure 17 Part structure schematic diagram of a battery provided by an embodiment of the present application

[0076] Figure 18 Part structure schematic diagram of a battery provided by an embodiment of the present application

[0077] Figure 19 Part structure schematic diagram of a battery provided by an embodiment of the present application Figure 3 Labeling schematic diagram of the part structure. DETAILED DESCRIPTION

[0078] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of the present application. In addition, it should be understood that the specific implementation described herein is only used to illustrate and explain the present application, but not to limit the present application. In the present application, the orientation words such as “upper” and “lower” generally refer to the upper and lower in the actual use or working state of the device, and specifically refer to the direction of the drawing surface in the drawings; and “inner” and “outer” refer to the contour of the device.

[0079] The technical solutions in the embodiments of the present application will be described below with reference to the drawings. Figures 1 to 19 The battery and the electric device of the present application are described.

[0080] According to the embodiments of the first aspect of the present application, referring to Figure 1 and Figure 3 , the battery comprises a shell 1, a connecting piece 2, and an encapsulation part 3, and the inner recess 12 protrudes towards the inner space of the shell 1, the connecting piece 2 connects the surface of the inner recess 12 facing the inner space of the shell 1 and the tab, and at least part of the encapsulation part 3 is arranged at the connection between the connecting piece 2 and the inner recess 12.

[0081] According to the battery of the embodiments of the present application, by arranging the encapsulation part 3 at the connection between the connecting piece 2 and the inner recess 12, the encapsulation part 3 can prevent impurities from entering the connection between the connecting piece 2 and the inner recess 12, avoid the impurities affecting the connection strength of the connecting piece 2 and the inner recess 12, improve the connection stability of the connecting piece 2 and the inner recess 12, so that the connecting piece 2 can stably connect the shell 1 and the tab, and further improve the connection stability between the tab and the shell 1.

[0082] In some embodiments, the connecting piece 2 comprises an electrode connecting piece 22 and a tab connecting piece 23 connected in sequence, the electrode connecting piece 22 is connected with the inner recess 12, and the tab connecting piece 23 is connected with the tab, thereby realizing the connection of the inner recess 12 of the shell 1 and the tab by the connecting piece 2.

[0083] In some embodiments, referring to Figure 2 and Figure 3 , the encapsulation part 3 is arranged at least partially on the electrode connecting piece 22.

[0084] It can be understood that, by arranging the encapsulation part 3 at least at part of the electrode connecting part 22, the position of the electrode connecting part 22 provided with the encapsulation part 3 can avoid contact with other substances (for example, electrolyte), so that the position of the electrode connecting part 22 provided with the encapsulation part 3 is not easy to corrode, which can effectively slow down the corrosion speed of the entire electrode connecting part 22 and improve the structural stability of the electrode connecting part 22.

[0085] It can be understood that the encapsulation part 3 arranged at least at part of the electrode connecting part 22 means that the encapsulation part 3 can be arranged at the connection between the electrode connecting part 22 and the shell 1. The encapsulation part 3 can prevent impurities from entering the connection between the electrode connecting part 22 and the shell 1, so as to avoid the influence of impurities on the connection strength of the electrode connecting part 22 and the shell 1.

[0086] In some embodiments, referring to Figure 2 and Figure 3 , the encapsulation part 3 is arranged at least at part of the tab connecting part 23.

[0087] It can be understood that, by arranging the encapsulation part 3 at least at part of the tab connecting part 23, the position of the tab connecting part 23 provided with the encapsulation part 3 can avoid contact with other substances (for example, electrolyte), so that the position of the tab connecting part 23 provided with the encapsulation part 3 is not easy to corrode, which can effectively slow down the corrosion speed of the entire tab connecting part 23 and improve the structural stability of the tab connecting part 23.

[0088] It can be understood that the encapsulation part 3 arranged at least at part of the electrode connecting part 22 and / or the encapsulation part 3 arranged at least at part of the tab connecting part 23 means that the encapsulation part 3 can be arranged at the connection between the electrode connecting part 22 and the tab connecting part 23. The encapsulation part 3 can prevent impurities from entering the connection between the electrode connecting part 22 and the tab connecting part 23, so as to avoid the influence of impurities on the connection strength of the electrode connecting part 22 and the tab connecting part 23.

[0089] In some embodiments, referring to Figure 3 , the first end of the electrode connecting part 22 is connected with the tab connecting part 23, and the second end of the electrode connecting part 22 is connected with the inner retraction part 12 and is arranged in a spaced manner with the tab connecting part 23.

[0090] It can be understood that the electrode connecting part 22 can connect the inner retraction part 12 and the tab connecting part 23, so as to realize the connection between the inner retraction part 12 and the tab.

[0091] The second end of the electrode connecting piece 22 is spaced apart from the tab connecting piece 23, which can avoid direct contact between the second end of the electrode connecting piece 22 and the tab connecting piece 23, reduce the contact points between the electrode connecting piece 22 and the tab connecting piece 23, avoid corrosion of the contact position between the second end of the electrode connecting piece 22 and the tab connecting piece 23, and further improve the connection stability of the electrode connecting piece 22 and the tab connecting piece 23.

[0092] In some embodiments, the battery further comprises an electrode assembly, the housing 1 is formed with a mounting cavity 11, the electrode assembly is arranged in the mounting cavity 11, and the connecting piece 2 is arranged on one side of the inwardly recessed portion 12.

[0093] Specifically, at least part of the electrode connecting piece 22 is connected to the side of the inwardly recessed portion 12 facing the electrode assembly, which facilitates the connection between the electrode connecting piece 22 and the inwardly recessed portion 12.

[0094] Specifically, at least part of the electrode connecting piece 22 is connected to the side of the inwardly recessed portion 12 away from the electrode assembly, so that the inwardly recessed portion 12 can support the electrode connecting piece 22 and improve the installation stability of the connecting piece 2.

[0095] In some embodiments, referring to Figure 3 , the connection position of the electrode connecting piece 22 and the tab connecting piece 23 and the connection position of the electrode connecting piece 22 and the housing 1 are located on different sides of the electrode connecting piece 22.

[0096] It can be understood that the housing 1 and the tab connecting piece 23 are connected to different sides of the electrode connecting piece 22, which can effectively prevent the tab connecting piece 23 and the housing 1 from directly contacting each other, reduce the contact points between the connecting piece 2 and the housing 1, and avoid corrosion of the contact position between the tab connecting piece 23 and the housing 1.

[0097] In some embodiments, the connection between the electrode connecting piece 22 and the inwardly recessed portion 12 is provided with an encapsulation portion 3.

[0098] It can be understood that the encapsulation portion 3 can prevent impurities (such as electrolyte) from entering the connection between the electrode connecting piece 22 and the inwardly recessed portion 12, avoid the influence of impurities on the connection strength between the electrode connecting piece 22 and the inwardly recessed portion 12, and ensure the connection strength between the electrode connecting piece 22 and the inwardly recessed portion 12.

[0099] In some embodiments, referring to Figure 19 , the housing 1 comprises a housing body 14 and the inwardly recessed portion 12, and the inwardly recessed portion 12 is connected to the housing body 14.

[0100] Along the radial direction of the shell 1, at least part of the electrode connecting piece 22 protrudes from the tab connecting piece 23 and is connected with the shell body 14, so that the tab connecting piece 23 and the shell body 14 are spaced apart, avoiding direct contact between the tab connecting piece 23 and the shell 1, and reducing the contact points between the connecting piece 2 and the shell 1.

[0101] In some embodiments, an included angle is formed between the side of the inwardly recessed portion 12 towards the electrode assembly and the shell body 14, and the included angle is between 0 degrees and 150 degrees.

[0102] In some embodiments, referring to Figure 3 , the minimum distance between the tab connecting piece 23 and the inwardly recessed portion 12 is greater than 0.05 mm, so as to ensure that the tab connecting piece 23 and the inwardly recessed portion 12 do not come into direct contact.

[0103] In some embodiments, referring to Figure 3 , the electrode connecting piece 22 comprises a first connecting section 223 and a second connecting section 224 connected in sequence, the first connecting section 223 is connected with the tab connecting piece 23, and the second connecting section 224 is connected with the inwardly recessed portion 12. That is, the tab connecting piece 23, the first connecting section 223 and the second connecting section 224 are connected in sequence to connect the inwardly recessed portion 12 and the tab together.

[0104] In some embodiments, referring to Figure 3 , a packaging portion 3 is arranged between the first connecting section 223 and the second connecting section 224, a first end of the packaging portion 3 extends along the surface of the first connecting section 223 and is connected with the second connecting section 224, and a second end of the packaging portion 3 extends along the surface of the first connecting section 223 and is connected with the tab connecting piece 23. In this way, the coverage area of the packaging portion 3 is increased, so that the first connecting section 223, the second connecting section 224 and the tab connecting piece 23 are all in contact with the packaging portion 3, the packaging and protection effect of the packaging portion 3 on the connecting piece 2 is improved, and the corrosion of the connecting piece 2 can be effectively avoided.

[0105] Specifically, referring to Figure 19 , along the axial direction of the shell 1, the height of the contact position of the packaging portion 3 with the second connecting section 224 is A9, and A9≥0.1 mm. In this way, the packaging portion 3 can effectively protect the connection between the first connecting section 223 and the second connecting section 224, and impurities are prevented from entering the connection between the first connecting section 223 and the second connecting section 224.

[0106] Specifically, referring to Figure 19 , along the radial direction of the shell 1, the length of the contact position of the packaging portion 3 with the tab connecting piece 23 is A7, and A7≥0.3 mm. In this way, the packaging portion 3 can effectively protect the connection between the first connecting section 223 and the tab connecting piece 23, and impurities are prevented from entering the connection between the first connecting section 223 and the tab connecting piece 23.

[0107] In some embodiments, referring to Figure 3 , the first end of the first connecting segment 223 is stacked on the tab connecting piece 23, and the second end of the first connecting segment 223 protrudes or is bent away from the tab connecting piece 23 relative to the first end of the first connecting segment 223.

[0108] It can be understood that the second end of the first connecting segment 223 protrudes or is bent away from the tab connecting piece 23, and the second connecting segment 224 is connected to the second end of the first connecting segment 223, so that the second connecting segment 224 protrudes from the tab connecting piece 23, facilitating the connection of the second connecting segment 224 and the shell 1.

[0109] In some embodiments, referring to Figure 3 , along the radial direction of the shell 1, at least part of the first connecting segment 223 protrudes from the tab connecting piece 23 and is connected to the side wall of the shell 1, so that the tab connecting piece 23 and the shell 1 are arranged at intervals.

[0110] Specifically, the part of the first connecting segment 223 protruding from the shell 1, the tab connecting piece 23, and the side wall of the shell 1 enclose an accommodation space 24, and the accommodation space 24 is used to accommodate the packaging part 3, thereby facilitating the arrangement of the packaging part 3.

[0111] In some embodiments, referring to Figure 19 , the shell 1 comprises a shell body 14 and a retracted portion 12, and the retracted portion 12 is connected to the shell body 14.

[0112] The second connecting segment 224 comprises a first connecting segment 2242 and a second connecting segment 2243 connected in sequence, the first connecting segment 2242 is connected to the first connecting segment 223, and the second connecting segment 2243 is connected to the retracted portion 12, the first connecting segment 2242 is connected to the shell body 14, and the second connecting segment 2243 is connected to the retracted portion 12.

[0113] It can be understood that the second connecting segment 224 is connected to the retracted portion 12 and the shell body 14 at the same time, improving the installation stability of the second connecting segment 224.

[0114] In some embodiments, referring to Figure 6 and Figure 8 , the electrode connecting piece 22 further comprises a third connecting segment 225, and the third connecting segment 225 connects the first connecting segment 223 and the second connecting segment 224.

[0115] It can be understood that the first connecting section 223 is connected with the tab connecting piece 23, the second connecting section 224 is connected with the inner shrink part 12, and the third connecting section 225 is connected between the first connecting section 223 and the second connecting section 224, so as to connect the first connecting section 223 and the second connecting section 224 by the third connecting section 225, the first connecting section 223 does not need to be directly contacted with the second connecting section 224, and then the tab connecting piece 23 also does not need to be directly contacted with the second connecting section 224, so that the contact between the tab connecting piece 23 and the shell 1 can be effectively prevented.

[0116] In some embodiments, the third connecting section 225 is spaced apart from the shell 1, the contact area between the electrode connecting piece 22 and the shell 1 is reduced, and the packaging part 3 can be arranged at the connection position of the electrode connecting piece 22 and the shell 1.

[0117] In some embodiments, referring to Figure 6 and Figure 8 , the second connecting section 224 is spaced apart from the tab connecting piece 23, so as to avoid the direct contact between the second connecting section 224 and the tab connecting piece 23, and the contact points between the electrode connecting piece 22 and the tab connecting piece 23 are reduced.

[0118] Specifically, the shortest distance between the second connecting section 224 and the tab connecting piece 23 is B8, and B8≥0.1mm, so as to avoid the direct contact between the second connecting section 224 and the tab connecting piece 23.

[0119] In some embodiments, referring to Figure 6 and Figure 8 , the end face of the first connecting section 223 close to the side wall of the shell 1 is flush with the end face of the tab connecting piece 23 close to the side wall of the shell 1.

[0120] The side of the third connecting section 225 away from the second connecting section 224 is provided with the packaging part 3 between the third connecting section 225 and the tab connecting piece 23, the tab connecting piece 23 and the third connecting section 225 are connected with the packaging part 3 at the same time, so that the packaging part 3 can effectively protect the connection position of the tab connecting piece 23 and the electrode connecting piece 22, impurities can be prevented from entering the connection position of the first connecting section 223 and the third connecting section 225, and impurities can also be prevented from entering the connection position of the first connecting section 223 and the tab connecting piece 23.

[0121] Specifically, the contact size of the packaging part 3 and the third connecting section 225 is C5, and C5≥0.3mm, so that the packaging part 3 can effectively protect the connection position of the tab connecting piece 23 and the electrode connecting piece 22.

[0122] In some embodiments, referring to Figure 6The first end of the third connecting segment 225 is connected with the first connecting segment 223, the second end of the third connecting segment 225 is bent relative to the first end of the third connecting segment 225 and the first connecting segment 223, and the packaging portion 3 is arranged between the second end of the third connecting segment 225 and the first connecting segment 223.

[0123] It can be understood that the packaging portion 3 can separate the second end of the third connecting segment 225 and the first connecting segment 223, avoid the second end of the third connecting segment 225 from contacting the first connecting segment 223, and reduce the contact points between the third connecting segment 225 and the first connecting segment 223.

[0124] In some embodiments, referring to Figure 8 The first end of the third connecting segment 225 is connected with the first connecting segment 223, the second end of the third connecting segment 225 is connected with the second connecting segment 224, and the second end of the third connecting segment 225 extends to the side wall surface of the shell 1 and abuts against the side wall surface of the shell 1 in a direction away from the tab connector 23, so that the third connecting segment 225 can separate the shell 1 and the tab connector 23, and avoid the shell 1 and the tab connector 23 from directly contacting.

[0125] Specifically, referring to Figure 8 In the radial direction of the shell 1, the length of the third connecting segment 225 is C8, and C8≥0.5mm, which ensures that the third connecting segment 225 can effectively separate the shell 1 and the tab connector 23, and ensures that the shell 1 and the tab connector 23 will not directly contact.

[0126] In some embodiments, referring to Figure 10 The tab connector 23 includes a first tab connector 231 and a second tab connector 232, the first tab connector 231 is connected to the end of the second tab connector 232, the second tab connector 232 is used to connect the tab, and the electrode connector 22 is connected to the side of the first tab connector 231 away from the second tab connector 232, so that the electrode connector 22 and the second tab connector 232 are staggered with each other, avoid the electrode connector 22 and the second tab connector 232 from directly contacting, and reduce the contact points between the tab connector 23 and the electrode connector 22.

[0127] In some embodiments, referring to Figure 10 The first tab connector 231, the electrode connector 22 and the shell 1 enclose the accommodation space 24, the accommodation space 24 is used to accommodate the packaging portion 3, thereby facilitating the arrangement of the packaging portion 3, so that the packaging portion 3 can play a packaging protection role on the connection between the first tab connector 231 and the electrode connector 22, avoid impurities from entering the connection between the first tab connector 231 and the electrode connector 22, can play a packaging protection role on the connection between the electrode connector 22 and the shell 1, and avoid impurities from entering the connection between the electrode connector 22 and the shell 1.

[0128] In some embodiments, referring to Figure 10 , the first end of the first tab connector 231 is connected with the second tab connector 232, and the second end of the first tab connector 231 extends in a direction towards the inner recess 12 to protrude from the second tab connector 232.

[0129] It can be understood that the second end of the first tab connector 231 protrudes from the second tab connector 232, shortens the distance between the second end of the first tab connector 231 and the inner recess 12, facilitates the connection of the electrode connector 22 and the inner recess 12, and can reduce the length of the electrode connector 22.

[0130] In some embodiments, referring to Figure 10 , an encapsulation portion 3 is arranged at the connection between the end of the first tab connector 231 away from the second tab connector 232 and the electrode connector 22. The encapsulation portion 3 can prevent impurities from entering the connection between the first tab connector 231 and the electrode connector 22, and avoid affecting the connection strength of the first tab connector 231 and the electrode connector 22.

[0131] Specifically, the first end of the encapsulation portion 3 extends along the first tab connector 231, and the second end of the encapsulation portion 3 extends along the electrode connector 22, thereby increasing the coverage area of the encapsulation portion 3 and improving the encapsulation protection effect of the encapsulation portion 3.

[0132] In some embodiments, referring to Figure 12 and Figure 13 , the first tab connector 231 is formed with a receiving groove 234, and part of the electrode connector 22 is located in the receiving groove 234, and another part of the electrode connector 22 protrudes from the receiving groove 234 and is connected with the shell 1.

[0133] It can be understood that the receiving groove 234 can limit the electrode connector 22 and improve the connection stability of the electrode connector 22 and the first tab connector 231. At least part of the electrode connector 22 protrudes from the receiving groove 234, which facilitates the connection of the electrode connector 22 and the shell 1.

[0134] Specifically, the first tab connector 231 is a bent structure.

[0135] Specifically, the encapsulation portion 3 is arranged at the bending portion of the first tab connector 231, which can encapsulate and protect the bending portion of the first tab connector 231, prevent impurities from entering the bending portion of the first tab connector 231, and avoid affecting the structural strength of the bending portion of the first tab connector 231.

[0136] In some embodiments, referring to Figure 13The first tab connecting piece 231 includes a first end and a second end arranged oppositely. The first end of the first tab connecting piece 231 is connected with the second tab connecting piece 232, and the second end of the first tab connecting piece 231 is arranged to be bent relative to the first end of the first tab connecting piece 231.

[0137] Specifically, the first end of the first tab connecting piece 231 is provided with an encapsulation part 3 between the first end of the first tab connecting piece 231 and the side wall of the shell 1. The encapsulation part 3 can separate the first tab connecting piece 231 and the side wall of the shell 1, so as to avoid the contact between the first end of the first tab connecting piece 231 and the shell 1.

[0138] Specifically, the second end of the first tab connecting piece 231 is provided with an encapsulation part 3 between the second end of the first tab connecting piece 231 and the inner retraction part 12. The encapsulation part 3 can separate the second end of the first tab connecting piece 231 and the inner retraction part 12, so as to avoid the contact between the second end of the first tab connecting piece 231 and the inner retraction part 12.

[0139] In some embodiments, referring to Figure 13 The bending angles of the first tab connecting piece 231, the electrode connecting piece 22 and the inner retraction part 12 are the same, which is beneficial to simplify the production steps of the battery and facilitate the production of the battery.

[0140] In some embodiments, the tab connecting piece 23 and the electrode connecting piece 22 are integrally formed, which improves the connection stability of the tab connecting piece 23 and the electrode connecting piece 22.

[0141] Exemplarily, the electrode assembly at least includes a winding core.

[0142] In some examples, the impurity is, for example, an electrolyte.

[0143] In some examples, the encapsulation part 3 is arranged at least partially on the connecting piece 2. For example, the encapsulation part 3 is arranged at the bending position of the connecting piece 2, or the encapsulation part 3 is arranged on the entire connecting piece 2, or the encapsulation part 3 is arranged at the end of the connecting piece 2 connected with the shell 1.

[0144] In some examples, at least part of the structure of the encapsulation part 3 is arranged at the connection position of the connecting piece 2 and the shell 1. For example, part of the encapsulation part 3 is arranged at the connection position of the connecting piece 2 and the shell 1, and another part of the encapsulation part 3 is arranged at other positions of the connecting piece 2.

[0145] In some examples, at least part of the structure of the encapsulation part 3 is arranged at the connection position of the connecting piece 2 and the shell 1. For example, part of the encapsulation part 3 is arranged at the connection position of the connecting piece 2 and the shell 1, and another part of the encapsulation part 3 is arranged at other positions of the connecting piece 2.

[0146] In some examples, the encapsulation part 3 is, for example, encapsulation glue, and the material of the encapsulation glue is polyurethane type, epoxy type, anaerobic glue, UV glue, acrylic type, hot melt glue, etc., and the elastic modulus of the encapsulation glue is between 0.1 Gpa and 6 Gpa.

[0147] Specifically, the connection part of the electrode connecting piece 22 and the electrode of the battery is provided with the encapsulation part 3.

[0148] It can be understood that by providing the encapsulation part 3 at the connection part of the electrode connecting piece 22 and the electrode of the battery, the encapsulation part 3 can prevent the connection part of the electrode connecting piece 22 and the electrode of the battery from contacting other substances, avoid the connection strength of the electrode connecting piece 22 and the electrode of the battery being affected by other substances, ensure the connection strength of the electrode connecting piece 22 and the electrode, improve the stability of the connection of the electrode connecting piece 22 and the electrode, and thus the connecting piece 2 can stably connect the electrode and the tab, and the stability of the connection of the electrode and the tab is improved.

[0149] Specifically, the connection part of the electrode connecting piece 22 and the tab connecting piece 23 is provided with the encapsulation part 3.

[0150] It can be understood that by providing the encapsulation part 3 at the connection part of the electrode connecting piece 22 and the tab connecting piece 23, the encapsulation part 3 can prevent the connection part of the electrode connecting piece 22 and the tab connecting piece 23 from contacting other substances, avoid the connection strength of the electrode connecting piece 22 and the tab connecting piece 23 being affected by other substances, ensure the connection strength of the electrode connecting piece 22 and the tab connecting piece 23, improve the structural stability of the connecting piece 2, and thus the connecting piece 2 can stably connect the electrode and the tab of the battery, and the stability of the connection of the electrode and the tab of the battery is improved.

[0151] Specifically, the electrode connecting piece 22 and the tab connecting piece 23 are in contact with the encapsulation part 3 at the same time.

[0152] It can be understood that at the connection part of the electrode connecting piece 22 and the tab connecting piece 23, part of the encapsulation part 3 is in contact with the electrode connecting piece 22, and another part of the encapsulation part 3 is in contact with the tab connecting piece 23, which ensures that the encapsulation part 3 can effectively encapsulate the connection part of the electrode connecting piece 22 and the tab connecting piece 23, effectively prevent impurities from entering the connection part of the electrode connecting piece 22 and the tab connecting piece 23, and improve the connection stability of the electrode connecting piece 22 and the tab connecting piece 23.

[0153] For example, the encapsulation part 3 has at least two connection surfaces, one of the connection surfaces of the encapsulation part 3 is in contact with the electrode connecting piece 22, and the other connection surface of the encapsulation part 3 is in contact with the tab connecting piece 23 at the connection part of the electrode connecting piece 22 and the tab connecting piece 23.

[0154] Specifically, the electrode connecting piece 22 and the electrode of the battery are in contact with the encapsulation part 3 at the same time.

[0155] It can be understood that at the connection between the electrode connector 22 and the electrode of the battery, one part of the encapsulation part 3 is in contact with the electrode connector 22, and the other part of the encapsulation part 3 is in contact with the electrode, so that the encapsulation part 3 can effectively encapsulate the connection between the electrode connector 22 and the electrode, effectively prevent impurities from entering the connection between the electrode connector 22 and the electrode, and improve the connection stability of the electrode connector 22 and the electrode.

[0156] For example, the encapsulation part 3 has at least two connecting surfaces, one of which is in contact with the electrode connector 22 at the connection between the electrode connector 22 and the electrode, and the other is in contact with the electrode.

[0157] In some examples, the electrode connector 22 is connected to the tab connector 23 by surface chemical treatment, such as electroplating, electroless plating, and spraying. It can also be connected to the tab connector 23 by surface physical treatment, such as composite metal stamping.

[0158] In some examples, the tab connector 23 and the electrode connector 22 can be connected together by welding, cold heading, thermal bonding, jointing, riveting, heat shrink tube, etc. The electrode connector 22 and the shell 1 can be connected by laser welding, spot welding, resistance welding, etc.

[0159] In some examples, the tab connector 23 includes a first contact surface in contact with the electrode connector 22, and the electrode connector 22 includes a second contact surface in contact with the tab connector 23, and the first contact surface and / or the second contact surface is provided with a protrusion / groove / rough surface / embossed structure to increase the contact area of the tab connector 23 and the electrode connector 22.

[0160] In some examples, the tab connector 23 is made of copper, and the electrode connector 22 is made of nickel-plated steel strip, nickel strip, or stainless steel.

[0161] In some embodiments, one of the shell 1, the electrode connector 22 and the tab connector 23 of the battery is a first metal piece, and the other two are second metal pieces, the first metal piece and the second metal piece are made of different metal materials, and the connection between the first metal piece and the second metal piece is provided with the encapsulation part 3. The first metal material is different from the second metal material.

[0162] It can be understood that by arranging the encapsulation part 3 at the connection between the first metal member and the second metal member, i.e. at the position where the different metal materials are in contact, the encapsulation part 3 can prevent the connection between the first metal member and the second metal member from being in contact with other substances (such as electrolyte), so that the connection between the first metal member and the second metal member is not prone to corrosion, thereby improving the structural stability of the connecting member 2 or the connection between the connecting member 2 and the shell 1, so that the connecting member 2 can stably connect the shell 1 and the tab.

[0163] It can be understood that the shell 1, the electrode connecting member 22 and the tab connecting member 23 include two different metal materials, which can effectively ensure the stability of the connection between the connecting part 21 and the shell 1.

[0164] For example, the first metal member is of a first metal material, and the second metal member is of a second metal material, and the first metal material and the second metal material are different.

[0165] It should be noted that the metal material includes a plurality of metal atoms, and the two metal materials respectively include two groups of metal atoms. As long as one metal atom in one group is different from the metal atom in the other group, the two groups can be considered as different metal materials. That is, as long as the metal atoms of the first metal material and the second metal material are not completely the same, i.e. as long as one metal atom of the first metal material and the second metal material is different, the first metal material and the second metal material can be considered as different.

[0166] The metal material can be pure metal, alloy, or metal matrix composite material with one or more insoluble solid particles.

[0167] The metal material can have a multi-layer structure, for example: the metal material can include a base material and a metal layer arranged on the base material. The metal layer can be formed on the base material by electroplating, CVD or the like. The metal layer can be pure metal, alloy, or metal matrix composite material with one or more insoluble solid particles.

[0168] Specifically, the electrode connecting member 22 and the tab connecting member 23 are both second metal members, the shell 1 is a first metal member, and the connection between the electrode connecting member 22 and the shell 1 is provided with an encapsulation part 3.

[0169] It can be understood that the metal materials of the electrode connecting member 22 and the shell 1 are different. By arranging the encapsulation part 3 at the connection between the electrode connecting member 22 and the shell 1, the encapsulation part 3 can prevent the connection between the electrode connecting member 22 and the shell 1 from being in contact with other substances, so that the connection between the electrode connecting member 22 and the shell 1, i.e. the connection between the different metal materials, is not prone to corrosion, thereby improving the connection stability between the electrode connecting member 22 and the shell 1, so that the connecting member 2 can stably connect the shell 1 and the tab.

[0170] Specifically, the electrode connecting piece 22 and the shell 1 are both second metal pieces, the tab connecting piece 23 is a first metal piece, and the connection part of the electrode connecting piece 22 and the tab connecting piece 23 is provided with the encapsulation part 3.

[0171] It can be understood that the metal materials of the electrode connecting piece 22 and the tab connecting piece 23 are different, and by providing the encapsulation part 3 at the connection part of the electrode connecting piece 22 and the tab connecting piece 23, the encapsulation part 3 can prevent the connection part of the electrode connecting piece 22 and the tab connecting piece 23 from contacting other substances, so that the connection part of the electrode connecting piece 22 and the tab connecting piece 23, i.e., the connection part of different metal materials, is not prone to corrosion, the connection stability of the electrode connecting piece 22 and the tab connecting piece 23 is improved, the structural stability of the connecting piece 2 is improved, and the connecting piece 2 can stably connect the shell 1 and the tab.

[0172] In some embodiments, referring to Figure 2 and Figure 4 , along the radial direction of the shell 1, the length of the tab connecting piece 23 is L1, and the diameter of the shell 1 is L2, where the ratio of L1 to L2 is between 0.01 and 0.99.

[0173] It can be understood that when the ratio of the length of the tab connecting piece 23 to the diameter of the shell 1 is less than 0.01, the length of the tab connecting piece 23 is too short, which is not conducive to the connection of the tab connecting piece 23 with the tab and the electrode connecting piece 22; when the ratio of the length of the tab connecting piece 23 to the diameter of the shell 1 is greater than 0.99, the distance between the tab connecting piece 23 and the shell 1 is small, and the tab connecting piece 23 is prone to contact the shell 1. Therefore, the ratio of the length of the tab connecting piece 23 to the diameter of the shell 1 is set to be between 0.01 and 0.99 in the present application, which ensures the connection of the tab and the electrode connecting piece 22 with the tab connecting piece 23, and also leaves a large enough gap between the tab connecting piece 23 and the shell 1 to prevent the tab connecting piece 23 from directly contacting the shell 1, thereby avoiding corrosion of the tab connecting piece 23 caused by contact with the shell 1.

[0174] In some embodiments, referring to Figure 2 and Figure 5 , along the radial direction of the shell 1, the distance between the tab connecting piece 23 and the shell 1 is L3, where L1+2L3≤L2.

[0175] It can be understood that the distance L3 is provided between the tab connecting piece 23 and the shell 1, so that the tab connecting piece 23 and the shell 1 are arranged apart to avoid direct contact between the tab connecting piece 23 and the shell 1.

[0176] When L1+2L3>L2, it indicates that the length of the connecting piece 2 is greater than the diameter of the shell 1 along the radial direction of the shell 1, which may cause the deformation of the shell 1 or the damage of the connecting piece 2, and thus affects the quality of the battery. Therefore, the sum of L1+2L3 is set to be less than or equal to L2, so that the connecting piece 2 and the shell 1 do not interfere with each other, and the quality of the battery is ensured.

[0177] Along the radial direction of the shell 1, both ends of the tab connecting piece 23 are connected with the electrode connecting piece 22. In order to avoid the direct contact between the tab connecting piece 23 and the shell 1, at least part of the electrode connecting piece 22 protrudes from the tab connecting piece 23, that is, at least part of the electrode connecting piece 22 is located between the tab connecting piece 23 and the inner wall surface of the shell 1.

[0178] In some embodiments, referring to Figure 4 , the electrode connecting piece 22 comprises a first side surface 221 and a second side surface 222 arranged oppositely, the first side surface 221 is connected with the shell 1, and the tab connecting piece 23 is arranged at the second side surface 222.

[0179] It can be understood that one side of the electrode connecting piece 22 is connected with the shell 1, and the other side is connected with the tab connecting piece 23, so that the electrode connecting piece 22 and the tab connecting piece 23 can connect the shell 1 and the tab.

[0180] The tab connecting piece 23 is connected to the side of the electrode connecting piece 22 away from the shell 1, which can avoid the direct contact between the tab connecting piece 23 and the shell 1, so as to avoid the corrosion at the connection between the tab connecting piece 23 and the shell 1.

[0181] In some embodiments, referring to Figure 4 , along the axial direction of the shell 1, the height of the fixed connection position between the tab connecting piece 23 and the second side surface 222 is L4, the height of the contact position between the tab connecting piece 23 and the second side surface 222 is L5, and L4≤L5.

[0182] It can be understood that the tab connecting piece 23 and the second side surface 222 of the electrode connecting piece 22 are connected, so that along the radial direction of the shell 1, the tab connecting piece 23 and the second side surface 222 at least partially coincide.

[0183] If L4>L5, the height of the fixed connection position of the lug connecting piece 23 and the second side surface 222 will be greater than the contact position of the lug connecting piece 23 and the second side surface 222, the fixed connection position will protrude from the contact position, which is not conducive to the connection of the lug connecting piece 23 and the electrode connecting piece 22, and at the same time, the height required by the packaging portion 3 also needs to be increased to cover the fixed connection position, which is not conducive to the packaging of the packaging portion 3 to the connection of the electrode connecting piece 22 and the lug connecting piece 23. Therefore, the present application sets L4 to be less than or equal to L5, which is convenient for the connection of the electrode connecting piece 22 and the lug connecting piece 23, and can also avoid the fixed connection position protruding from the contact position, thereby facilitating the setting of the packaging portion 3.

[0184] It can be understood that the lug connecting piece 23 includes an end surface connected with the second side surface 222, and the part fixedly connected with the second side surface 222 is the fixed connection position. When L4 is less than L5, it means that part of the end surface is not fixedly connected with the second side surface 222, that is, it is only in abutment or spaced apart from the second side surface 222.

[0185] In some examples, the electrode connecting piece 22 and the lug connecting piece 23 are fixedly connected by welding, and the fixed connection position of the lug connecting piece 23 and the second side surface 222 refers to the welding position of the lug connecting piece 23 and the second side surface 222.

[0186] In some embodiments, referring to Figure 2 , along the axial direction of the shell 1, the height of the fixed connection position of the electrode connecting piece 22 and the shell 1 is L6, and the height of the contact position of the electrode connecting piece 22 and the shell 1 is L7, 0<L6≤L7≤15mm.

[0187] It can be understood that if L6>L7, the height of the fixed connection position of the electrode connecting piece 22 and the shell 1 will be greater than the height of the contact position of the electrode connecting piece 22 and the shell 1, and the fixed connection position will protrude from the contact position, which is not conducive to the connection of the electrode connecting piece 22 and the shell 1, and at the same time, the height required by the packaging portion 3 also needs to be increased to cover the fixed connection position, which is not conducive to the packaging of the packaging portion 3 to the connection of the electrode connecting piece 22 and the shell 1. Therefore, the present application sets L6 to be less than or equal to L7, which is convenient for the connection of the electrode connecting piece 22 and the shell 1, and can also avoid the fixed connection position protruding from the contact position, thereby facilitating the setting of the packaging portion 3.

[0188] L6 is greater than 0, which ensures the fixed connection of the electrode connecting piece 22 and the shell 1. L7 is less than or equal to 15mm, which can avoid having a great impact on the size of the battery.

[0189] It can be understood that the electrode connecting piece 22 includes a side surface connected with the shell 1, and the part of the side surface fixedly connected with the shell 1 is a fixed connection part. When L6 is less than L7, it indicates that part of the side surface is not fixedly connected with the shell 1, that is, only abuts or is spaced apart from the shell 1.

[0190] In some examples, the electrode connecting piece 22 and the shell 1 are fixedly connected by welding, and the fixed connection part of the shell 1 and the electrode connecting piece 22 refers to the welding part of the shell 1 and the electrode connecting piece 22.

[0191] In some embodiments, the thickness of the electrode connecting piece 22 is between 0.05 mm and 2 mm.

[0192] It can be understood that when the thickness of the electrode connecting piece 22 is less than 0.05 mm, the structural strength of the electrode connecting piece 22 is low and is easy to be damaged; when the thickness of the electrode connecting piece 22 is greater than 2 mm, the thickness of the electrode connecting piece 22 is too large, which is easy to cause the overall thickness of the connecting piece 2 to be large, thereby affecting the size of the battery. Therefore, the thickness of the electrode connecting piece 22 is set to be between 0.05 mm and 2 mm in the present application, so as to ensure the structural strength of the electrode connecting piece 22, and also to avoid affecting the overall thickness of the connecting piece 2 and the size of the battery.

[0193] In some embodiments, the thickness of the tab connecting piece 23 is between 0.05 mm and 2 mm.

[0194] It can be understood that when the thickness of the tab connecting piece 23 is less than 0.05 mm, the structural strength of the tab connecting piece 23 is low and is easy to be damaged; when the thickness of the tab connecting piece 23 is greater than 2 mm, the thickness of the tab connecting piece 23 is too large, which is easy to affect the height of the battery. Therefore, the thickness of the tab connecting piece 23 is set to be between 0.05 mm and 2 mm in the present application, so as to ensure the structural strength of the tab connecting piece 23, and also to avoid affecting the height of the battery.

[0195] In some embodiments, the thickness of the shell 1 is between 0.2 mm and 1 mm.

[0196] It can be understood that when the thickness of the shell 1 is less than 0.05 mm, the structural strength of the shell 1 is low and is easy to be damaged; when the thickness of the shell 1 is greater than 2 mm, the thickness of the shell 1 is too large, which is easy to affect the size of the battery. Therefore, the thickness of the shell 1 is set to be between 0.05 mm and 2 mm in the present application, so as to ensure the structural strength of the shell 1, and also to avoid affecting the size of the battery.

[0197] In some embodiments, the hardness of the tab connector 23 is between HV 50 and HV 120; and / or, the tensile strength of the tab connector 23 is greater than 180 Mpa; and / or, the impedance of the tab connector 23 is less than 2 mΩ, thereby ensuring the performance of the tab connector 23.

[0198] In some embodiments, the hardness of the electrode connector 22 is between HV 50 and HV 120; and / or, the tensile strength of the electrode connector 22 is greater than 180 Mpa; and / or, the impedance of the electrode connector 22 is less than 2 mΩ, thereby ensuring the performance of the electrode connector 22.

[0199] In some embodiments, the hardness of the shell 1 is between HV 80 and HV 200; and / or, the tensile strength of the shell 1 is between 240 Mpa and 600 Mpa; and / or, the impedance of the shell 1 is less than 2 mΩ, thereby ensuring the performance of the shell 1.

[0200] It can be understood that HV is Vickers hardness.

[0201] In some embodiments, referring to Figure 2 and Figure 5 , the first end of the electrode connector 22 is connected to the tab connector 23, the second end of the electrode connector 22 protrudes from the tab connector 23, and a receiving space 24 is formed between the second end of the electrode connector 22 and the tab connector 23 and / or between the first end of the electrode connector 22 and the tab connector 23, and the receiving space 24 is used to accommodate the packaging portion 3.

[0202] It can be understood that the receiving space 24 can be formed between the first end of the electrode connector 22 and the tab connector 23, or between the second end of the electrode connector 22 and the tab connector 23. The receiving space 24 can accommodate the packaging portion 3, thereby facilitating the packaging portion 3 to be arranged between the electrode connector 22 and the tab connector 23, so as to prevent impurities from entering the connector 2 by using the packaging portion 3.

[0203] It can be understood that the first end of the electrode connecting piece 22 is connected with the tab connecting piece 23, and the first end of the electrode connecting piece 22 and the tab connecting piece 23 have a connecting position, so that the accommodating space 24 for accommodating the packaging portion 3 can be arranged between the first end of the electrode connecting piece 22 and the tab connecting piece 23, and the packaging portion 3 is used to prevent corrosion of the connecting position of the electrode connecting piece 22 and the tab connecting piece 23. The second end of the electrode connecting piece 22 protrudes from the tab connecting piece 23, that is, the structure of the connecting piece 2 is bent at the contact position of the second end of the electrode connecting piece 22 and the tab connecting piece 23, so that the accommodating space 24 for accommodating the packaging portion 3 can be formed between the second end of the electrode connecting piece 22 and the tab connecting piece 23, and the packaging portion 3 is used to prevent impurities from entering the connecting piece 2.

[0204] In some embodiments, referring to Figure 2 and Figure 5 , part of the electrode connecting piece 22 is arranged on one side of the tab connecting piece 23.

[0205] It can be understood that part of the electrode connecting piece 22 is arranged on one side of the tab connecting piece 23, so that another part of the electrode connecting piece 22 and the tab connecting piece 23 form a space, and the other part of the electrode connecting piece 22 can be bent towards the tab connecting piece 23, thereby facilitating the bending forming of the connecting piece 2.

[0206] In some examples, another part of the electrode connecting piece 22 is connected to the inner recessed portion 12 of the shell 1, and the inner recessed portion 12 of the shell 1 protrudes inwardly of the shell 1. That is, in the finally formed battery, another part of the electrode connecting piece 22 is bent under the action of the inner recessed portion 12, and the present application arranges part of the electrode connecting piece 22 on one side of the tab connecting piece 23, so that another part of the electrode connecting piece 22 has a bending space, thereby facilitating the forming of the connecting piece 2 and the battery.

[0207] Specifically, referring to Figure 2 and Figure 5 , along the axial direction of the shell 1, the electrode connecting piece 22 and the tab connecting piece 23 at least partially coincide;

[0208] Along the radial direction of the shell 1, the length of the fixed connection position of the electrode connecting piece 22 and the tab connecting piece 23 is L8, and the length of the contact position of the electrode connecting piece 22 and the tab connecting piece 23 is L9, L8≤L9.

[0209] It can be understood that if L8>L9, the length of the fixed connection position of the electrode connecting piece 22 and the tab connecting piece 23 will be greater than the length of the contact position of the electrode connecting piece 22 and the tab connecting piece 23, and the fixed connection position will protrude from the contact position, which is not conducive to the connection of the electrode connecting piece 22 and the tab connecting piece 23, and at the same time, the length of the packaging portion 3 also needs to be increased to cover the fixed connection position, which is not conducive to the packaging of the packaging portion 3 to the connection of the electrode connecting piece 22 and the tab connecting piece 23. Therefore, the present application sets L8 to be less than or equal to L9, which is convenient for the connection of the electrode connecting piece 22 and the tab connecting piece 23, and can also avoid the fixed connection position protruding from the contact position, thereby facilitating the setting of the packaging portion 3.

[0210] It can be understood that the electrode connecting piece 22 includes a connecting surface connected with the tab connecting piece 23, and the part of the connecting surface fixedly connected with the tab connecting piece 23 is the fixed connection position. When L8 is less than L9, it means that part of the connecting surface is not fixedly connected with the tab connecting piece 23, that is, it is only in abutment or spaced apart from the tab connecting piece 23.

[0211] In some examples, the electrode connecting piece 22 and the tab connecting piece 23 are fixedly connected by welding, and the fixed connection position of the electrode connecting piece 22 and the tab connecting piece 23 refers to the welding position of the electrode connecting piece 22 and the tab connecting piece 23.

[0212] In some embodiments, there are at least two different lengths of the contact position of the electrode connecting piece and the tab connecting piece along the radial direction of the shell.

[0213] In some embodiments, referring to Figure 2 and Figure 5 , the length of the tab connecting piece 23 is L1, and L9≤L1. When L9 is greater than L1, the structure of the electrode connecting piece 22 needs to be extended and connected with the side wall of the tab connecting piece 23, which leads to the complexity of the structure of the electrode connecting piece 22. Therefore, the present application sets L9 to be less than or equal to L1.

[0214] In some examples, the first end of the first connecting segment 223 is overlapped with the tab connecting piece 23.

[0215] Specifically, the first end of the first connecting segment 223 and the tab connecting piece 23 form an accommodation space 24 therebetween, so as to facilitate the setting of the packaging portion 3 between the first end of the first connecting segment 223 and the tab connecting piece 23, so that the packaging portion 3 can prevent the contact position of the first end of the first connecting segment 223 and the tab connecting piece 23 from contacting other substances, and can effectively prevent the contact position of the first end of the first connecting segment 223 and the tab connecting piece 23 from being corroded.

[0216] Specifically, the second end of the first connecting section 223 and the tab connecting piece 23 form an accommodation space 24, so as to facilitate the packaging part 3 to be arranged between the second end of the first connecting section 223 and the tab connecting piece 23, so that the packaging part 3 can prevent the contact position of the second end of the first connecting section 223 and the tab connecting piece 23 from contacting other substances, and can effectively prevent the contact position of the second end of the first connecting section 223 and the tab connecting piece 23 from being corroded.

[0217] In some embodiments, referring to Figure 2 , the first connecting section 223 and the second connecting section 224 are provided with the packaging part 3.

[0218] It can be understood that by arranging the packaging part 3 at the connection position of the first connecting section 223 and the second connecting section 224, the packaging part 3 can prevent the connection position of the first connecting section 223 and the second connecting section 224 from contacting other substances, so as to prevent the connection position of the first connecting section 223 and the second connecting section 224 from being corroded.

[0219] In some embodiments, at least part of the first connecting section 223 is provided with the packaging part 3.

[0220] It can be understood that by arranging the packaging part 3 at least part of the first connecting section 223, under the action of the packaging part 3, the position of the first connecting section 223 provided with the packaging part 3 can avoid contacting other substances, so that the position of the first connecting section 223 provided with the packaging part 3 is not easy to be corroded, which can effectively slow down the corrosion speed of the entire first connecting section 223, improve the structural stability of the first connecting section 223 and the connecting piece 2, and further improve the stability of the connection between the shell 1 and the tab.

[0221] In some embodiments, at least part of the second connecting section 224 is provided with the packaging part 3.

[0222] It can be understood that by arranging the packaging part 3 at least part of the second connecting section 224, under the action of the packaging part 3, the position of the second connecting section 224 provided with the packaging part 3 can avoid contacting other substances, so that the position of the second connecting section 224 provided with the packaging part 3 is not easy to be corroded, which can effectively slow down the corrosion speed of the entire second connecting section 224, improve the structural stability of the second connecting section 224 and the connecting piece 2, and further improve the stability of the connection between the shell 1 and the tab.

[0223] In some embodiments, the second connecting section 224 and the shell 1 are provided with the packaging part 3.

[0224] It can be understood that the packaging part 3 can prevent impurities from entering the connection position of the second connecting section 224 and the shell 1, and avoid the impurities from affecting the connection strength of the second connecting section 224 and the shell 1.

[0225] In some embodiments, the second connecting section 224 is located on the side of the first connecting section 223 away from the inner bottom wall of the shell 1. Thus, a space is formed between the second connecting section 224 and the tab connecting piece 23, and the second connecting section 224 can be bent towards the tab connecting piece 23, thereby facilitating the bending forming of the connecting piece 2.

[0226] In some examples, the second connecting section 224 is connected to the inner recess 12 of the shell 1, and the inner recess 12 of the shell 1 protrudes towards the inner of the shell 1. That is, in the finally formed battery, the second connecting section 224 will be bent under the action of the inner recess 12. The present application is to locate the first connecting section 223 between the second connecting section 224 and the inner bottom wall of the shell 1, so that the second connecting section 224 has a bending space, thereby facilitating the forming of the connecting piece 2 and the battery.

[0227] In some embodiments, referring to Figure 5 , Figure 6 , Figure 7 and Figure 8 , the electrode connecting piece 22 further comprises a third connecting section 225 connecting the first connecting section 223 and the second connecting section 224. Thus, the first connecting section 223 and the second connecting section 224 are spaced apart, and a receiving cavity 226 is formed between the first connecting section 223 and the second connecting section 224 along the axial direction of the shell 1.

[0228] It can be understood that by connecting the first connecting section 223 and the second connecting section 224 through the third connecting section 225, the distance between the second connecting section 224 and the tab connecting piece 23 is increased, so that the receiving cavity 226 for bending the second connecting section 224 is formed between the second connecting section 224 and the tab connecting piece 23, thereby facilitating the bending forming of the connecting piece 2.

[0229] It can be understood that the second connecting section 224 is connected to the inner recess of the shell 1, and the distance between the second connecting section 224 and the tab connecting piece 23 is increased by the third connecting section 225. When the inner recess is formed to protrude towards the inside of the shell 1, the distance between the inner recess and the tab connecting piece 23 can be increased due to the third connecting section 225, so as to avoid the contact between the inner recess and the tab connecting piece 23.

[0230] For example, the third connecting section 225 can be a straight section or a bent section.

[0231] Specifically, referring to Figure 5 , along the radial direction of the shell 1, the length of the tab connecting piece 23 is L1, and the diameter of the shell 1 is L2, wherein the ratio of L1 to L2 is between 0.1 and 0.95.

[0232] It can be understood that if the ratio of the length of the tab connecting piece 23 to the diameter of the shell 1 is less than 0.1, the length of the tab connecting piece 23 is short, which is not conducive to the electrode connecting piece 22 being stacked on the tab connecting piece 23, that is, not conducive to the connection between the tab connecting piece 23 and the electrode connecting piece 22; if the ratio of the length of the tab connecting piece 23 to the diameter of the shell 1 is greater than 0.95, the distance between the tab connecting piece 23 and the inner wall surface of the shell 1 is small, so that the third connecting segment 225 and the second connecting segment 224 protrude from the tab connecting piece 23 by a short distance, which is not conducive to the bending formation of the second connecting segment 224. Therefore, the ratio of the length of the tab connecting piece 23 to the diameter of the shell 1 is set to be between 0.1 and 0.95.

[0233] Specifically, referring to Figure 5 , along the radial direction of the shell 1, the length of the fixed connection position of the electrode connecting piece 22 and the tab connecting piece 23 is L8, and the length of the tab connecting piece 23 is L1. The ratio of L8 and L1 is between 0.05 and 0.5.

[0234] It can be understood that if the ratio of L8 and L1 is less than 0.05, the length of the fixed connection position of the electrode connecting piece 22 and the tab connecting piece 23 will be short, and the connection stability of the electrode connecting piece 22 and the tab connecting piece 23 is insufficient; if the ratio of L8 and L1 is greater than 0.5, the connection difficulty will be increased. Therefore, the ratio of L8 and L1 is set to be between 0.05 and 0.5.

[0235] In some embodiments, referring to Figure 5 , the connection between the third connecting segment 225 and the first connecting segment 223 is provided with an encapsulation part 3.

[0236] It can be understood that the encapsulation part 3 can prevent the connection between the third connecting segment 225 and the first connecting segment 223 from contacting other substances, so as to prevent corrosion of the connection between the third connecting segment 225 and the first connecting segment 223, and improve the connection stability of the third connecting segment 225 and the first connecting segment 223.

[0237] In some embodiments, the connection between the third connecting segment 225 and the second connecting segment 224 is provided with an encapsulation part 3.

[0238] It can be understood that the encapsulation part 3 can prevent the connection between the third connecting segment 225 and the second connecting segment 224 from contacting other substances, so as to prevent corrosion of the connection between the third connecting segment 225 and the second connecting segment 224, and improve the connection stability of the third connecting segment 225 and the second connecting segment 224.

[0239] In some embodiments, at least part of the third connecting segment 225 is provided with an encapsulation part 3.

[0240] It can be understood that, by arranging the encapsulation part 3 at least at the third connecting section 225, the position of the third connecting section 225 provided with the encapsulation part 3 can be prevented from contacting other substances under the action of the encapsulation part 3, so that the position of the third connecting section 225 provided with the encapsulation part 3 is not prone to corrosion, the corrosion speed of the entire third connecting section 225 can be effectively slowed down, the structural stability of the third connecting section 225 and the connecting piece 2 is improved, and the stability of the connection between the shell 1 and the tab is further improved.

[0241] In some embodiments, referring to Figure 5 and Figure 7 , the distance between the end of the tab connecting piece 23 and the inner wall surface of the shell 1 along the radial direction of the shell 1 is L10.

[0242] Specifically, referring to Figure 5 and Figure 7 , the second connecting section 224 has a first surface 2241 facing the first connecting section 223, the intersection line between the extension surface of the first surface 2241 and the side wall surface of the shell 1 is a first intersection line, the tab connecting piece 23 has a second surface 2301 facing away from the first connecting section 223, the intersection line between the extension surface of the second surface 2301 and the side wall surface of the shell 1 is a second intersection line, the perpendicular distance between the first intersection line and the second intersection line is L11, and L10≤L11. It can be understood that, if L10 is greater than L11, the length of the third connecting section 225 along the radial direction of the shell 1 will be longer, which will cause the length of the connecting piece 2 to be longer, and thus will have a greater impact on the size of the battery, so L10 is set to be less than or equal to L11 in the present application.

[0243] Specifically, referring to Figure 5 and Figure 7 , the length of the contact position of the electrode connecting piece 22 and the tab connecting piece 23 along the radial direction of the shell 1 is L9, and L10≤L9. It can be understood that, if L10 is greater than L9, the length of the contact position of the electrode connecting piece 22 and the tab connecting piece 23 along the radial direction of the shell 1 will be shorter, and thus the length of the fixed connection position of the electrode connecting piece 22 and the tab connecting piece 23 will also be shorter, which will be not conducive to the connection of the electrode connecting piece 22 and the tab connecting piece 23, so L10 is set to be less than or equal to L9 in the present application.

[0244] In some embodiments, referring to Figure 9 and Figure 10 , the tab connecting piece 23 includes a first tab connecting piece 231 and a second tab connecting piece 23, the first tab connecting piece 231 is connected to the end of the second tab connecting piece 23, the second tab connecting piece 23 is used to connect the tab, and the electrode connecting piece 22 is connected to the side of the first tab connecting piece 231 facing away from the second tab connecting piece 23.

[0245] The first tab connecting piece 231 protrudes from the second tab connecting piece 23 along the axial direction of the shell 1, and the connection between the first tab connecting piece 231 and the electrode connecting piece 22 is provided with the encapsulation part 3.

[0246] It can be understood that the first tab connecting piece 231 protrudes from the second tab connecting piece 23, and thus a space for accommodating the encapsulation part 3 is formed at the contact position of the first tab connecting piece 231 and the second tab connecting piece 23, facilitating the arrangement of the encapsulation part 3.

[0247] By arranging the encapsulation part 3 at the connection between the first tab connecting piece 231 and the electrode connecting piece 22, the encapsulation part 3 can prevent the connection between the first tab connecting piece 231 and the electrode connecting piece 22 from contacting other substances, so as to prevent corrosion of the connection position of the first tab connecting piece 231 and the electrode connecting piece 22, and improve the connection stability of the first tab connecting piece 231 and the electrode connecting piece 22.

[0248] In some embodiments, referring to Figure 9 The first tab connecting piece 231 is arranged apart from the shell 1 to avoid direct contact between the first tab connecting piece 231 and the shell 1, and also facilitates the arrangement of the encapsulation part 3 between the first tab connecting piece 231 and the shell 1.

[0249] It can be understood that an encapsulation space 233 is formed between the first tab connecting piece 231 and the inner wall surface of the shell 1, and the encapsulation space 233 is used to accommodate the encapsulation part 3.

[0250] It can be understood that by forming the encapsulation space 233 between the first tab connecting piece 231 and the inner wall surface of the shell 1, the arrangement of the encapsulation part 3 is facilitated, so that the encapsulation part 3 can be better arranged at the connection between the first tab connecting piece 231 and the shell 1.

[0251] Specifically, the intersection line between the extension surface of the surface of the second tab connecting piece 23 away from the electrode connecting piece 22 and the side wall surface of the shell 1 is a third intersection line 2321, the intersection line between the end surface of the electrode connecting piece 22 toward the second tab connecting piece 23 and the side wall surface of the shell 1 is a fourth intersection line 2201, and the perpendicular distance between the third intersection line 2321 and the fourth intersection line 2201 is greater than 0.12 mm, so as to ensure that the space between the third intersection line 2321 and the fourth intersection line 2201 can accommodate sufficient encapsulation part 3.

[0252] It can be understood that the height H of the packaging space 233 is greater than 0.12 mm along the axial direction of the shell 1. If the height H of the packaging space 233 is not greater than 0.12 mm, the height of the packaging space 233 will be too low, so that the packaging space 233 is difficult to accommodate the packaging part 3. Therefore, the height of the packaging space 233 is set to be greater than 0.12 mm in the present application, so that the packaging space 233 can accommodate enough packaging parts 3, which ensures that the packaging part 3 can effectively encapsulate and separate the connection between the first tab connecting piece 231 and the shell 1, and improves the corrosion prevention effect of the connection between the first tab connecting piece 231 and the shell 1. It can also prevent the bottom of the electrode connecting piece 22 from being flush with the bottom of the tab connecting piece 23, and the existence of the packaging part 3 will protrude and affect the connection between the tab connecting piece 23 and the tab.

[0253] In some embodiments, the height of the electrode connecting piece 22 is less than the height of the first tab connecting piece 231 along the axial direction of the shell 1, wherein,

[0254] A packaging space is formed between the first end of the first tab connecting piece 231 and the first end of the electrode connecting piece 22, and the packaging space 233 is used to accommodate the packaging part 3; and / or,

[0255] A packaging space is formed between the second end of the first tab connecting piece 231 and the second end of the electrode connecting piece 22, and the packaging space 233 is used to accommodate the packaging part 3.

[0256] It can be understood that the electrode connecting piece 22 is connected to the side of the first tab connecting piece 231 away from the second connecting block, and the height of the electrode connecting piece 22 is less than the height of the first tab connecting piece 231, so that a space for accommodating the packaging part 3 is formed between the electrode connecting piece 22 and the end of the first tab connecting piece 231, so as to provide the packaging part 3 at the connection between the electrode connecting piece 22 and the first tab connecting piece 231.

[0257] Specifically, a packaging space is formed between the first end of the first tab connecting piece 231 and the first end of the electrode connecting piece 22, so as to provide the packaging part 3 at the connection between the first end of the first tab connecting piece 231 and the first end of the electrode connecting piece 22.

[0258] Specifically, a packaging space is formed between the second end of the first tab connecting piece 231 and the second end of the electrode connecting piece 22, so as to provide the packaging part 3 at the connection between the second end of the first tab connecting piece 231 and the second end of the electrode connecting piece 22.

[0259] In some embodiments, referring to Figure 9 along the radial direction of the shell 1, the orthographic projection of the first tab connecting piece 231 on the side wall surface of the shell 1 at least partially overlaps with the orthographic projection of the electrode connecting piece 22 on the side wall surface of the shell 1.

[0260] It can be understood that when the first tab connector 231 is projected on the side wall surface of the shell 1, and the projection of the electrode connector 22 on the side wall surface of the shell 1 coincides with the projection of the first tab connector 231 on the side wall surface of the shell 1, it means that the first tab connector 231 protrudes from the electrode connector 22 or the electrode connector 22 protrudes from the first tab connector 231 at this time, which means that the connection between the first tab connector 231 and the electrode connector 22 will form a space that can accommodate the packaging portion 3, thereby facilitating the arrangement of the packaging portion 3 at the connection between the electrode connector 22 and the first tab connector 231.

[0261] In some embodiments, referring to Figure 11 , along the radial direction of the shell 1, the projection of the electrode connector 22 on the side wall surface of the shell 1 is located within the projection of the first tab connector 231 on the side wall surface of the shell 1.

[0262] It can be understood that along the axial direction of the shell 1, the electrode connector 22 and the end portion of the first tab connector 231 have a certain distance, that is, the electrode connector 22 and the end portion of the first tab connector 231 will form a space for accommodating the packaging portion 3, so as to facilitate the arrangement of the packaging portion 3 at the connection between the electrode connector 22 and the first tab connector 231.

[0263] In some embodiments, a gap is provided between the electrode connector 22 and the side wall surface of the accommodation groove 234, and the packaging portion 3 between the electrode connector 22 and the first tab connector 231 is at least partially arranged in the gap.

[0264] It can be understood that arranging at least part of the packaging portion 3 in the gap makes the packaging portion 3 prevent other substances from appearing in the gap, thereby preventing the connection between the electrode connector 22 and the first tab connector 231 from contacting other substances, so that the connection between the electrode connector 22 and the first tab connector 231 is not easy to corrode.

[0265] In some embodiments, referring to Figure 12 , a packaging portion 3 is arranged between the side wall surface of the electrode connector 22 and the side wall surface of the tab connector 23 facing the side wall of the shell 1.

[0266] It can be understood that the electrode connector 22 is arranged in the accommodation groove 234 of the first tab connector 231, and by arranging a packaging portion between the side wall surface of the electrode connector 22 and the side wall surface of the tab connector 23 facing the side wall of the shell 1, the packaging portion 3 can seal the slot of the accommodation groove 234, and the position between the electrode connector 22 and the slot of the accommodation groove 234 can be encapsulated and isolated, so that the contact position of the electrode connector 22 and the slot of the accommodation groove 234 will not contact other substances, and other substances will not enter the accommodation groove 234, thereby effectively preventing corrosion of the connection between the electrode connector 22 and the first tab connector 231.

[0267] In some embodiments, the thickness of the electrode connecting piece 22 is less than the thickness of the first tab connecting piece 231.

[0268] It can be understood that if the thickness of the electrode connecting piece 22 is greater than the thickness of the first tab connecting piece 231, the total thickness of the electrode connecting piece 22 and the first tab connecting piece 231 along the radial direction of the shell 1 will be too large, which will affect the battery. Therefore, the thickness of the electrode connecting piece 22 is set to be less than the thickness of the first tab connecting piece 231.

[0269] In some embodiments, the side of the first tab connecting piece 231 close to the center of the shell 1 is provided with the packaging portion 3.

[0270] It can be understood that the side of the first tab connecting piece 231 close to the center of the shell 1 is provided with the packaging portion 3, that is, the packaging portion 3 and the accommodating groove 234 are respectively located on the opposite sides of the first tab connecting piece 231. During the production process of the battery, the inwardly recessed portion of the shell 1 will make the first tab connecting piece 231 bend towards the center of the shell 1, so that the packaging portion 3 can be located at the bending portion of the first tab connecting piece 231, thereby achieving packaging protection of the bending portion of the first tab connecting piece 231, avoiding the bending portion of the first tab connecting piece 231 from contacting other substances, and preventing the bending portion of the first tab connecting piece 231 from being corroded.

[0271] In some embodiments, the contact area of the tab connecting piece 23 and the tab is S1, the welding area of the tab connecting piece 23 and the tab is s1, and the metal unit area overcurrent capacity of the contact position of the tab connecting piece 23 and the tab is I1; the contact area of the tab connecting piece 23 and the electrode connecting piece 22 is S2, the welding area of the tab connecting piece 23 and the electrode connecting piece 22 is s2, and the metal unit area overcurrent capacity of the contact position of the tab connecting piece 23 and the electrode connecting piece 22 is I2; the contact area of the electrode connecting piece 22 and the shell 1 is S3, the welding area of the electrode connecting piece 22 and the shell 1 is s3, and the metal overcurrent capacity of the contact position of the electrode connecting piece 22 and the shell 1 is I3; the overcurrent requirement of the battery is a.

[0272] Specifically, S1≥a / I1, S2≥a / I2, and S3≥a / I3, so as to effectively control the temperature rising speed of the battery and avoid the temperature of the battery being too high.

[0273] Specifically, s1 / S1=10%-90%, s2 / S2=10%-90%, and s3 / S3=10%-90%, so as to effectively control the temperature rising speed of the battery and avoid the temperature of the battery being too high.

[0274] It can be understood that the unit of overcurrent capacity is A (ampere), and the unit of overcurrent requirement is A / mm2 The unit of the contact area is mm 2 .

[0275] In some embodiments, referring to Figure 14 The connecting piece 2 comprises a plurality of tab connecting pieces 23, which are arc-shaped blocks coaxial with each other, the sum of the lengths of the two side edges of the tab connecting pieces 23 and the length of the outer wall surface is R1, and the height of the contact position of the electrode connecting piece 22 and the shell 1 is H1, wherein R1×H1≥a / I2, so as to effectively control the temperature rising speed of the connecting piece 2 and improve the safety and stability of the battery.

[0276] In some embodiments, referring to Figure 14 and Figure 15 The battery further comprises a mounting bracket 4 fixed in the shell 1, and the connecting piece 2 is mounted on the mounting bracket 4, which is used to support the connecting piece 2.

[0277] It can be understood that mounting the connecting piece 2 on the mounting bracket 4 and supporting and fixing the connecting piece 2 by the mounting bracket 4 improves the stability of the connecting piece 2 and the stability of the connecting piece 2 connecting the shell 1 and the tab.

[0278] In some examples, the mounting bracket 4 is fixedly connected to the shell 1 or is fixedly connected to the current collector plate of the battery mounted in the shell 1.

[0279] In some embodiments, referring to Figure 14 and Figure 15 The connecting piece 2 comprises an electrode connecting piece 22 connected to the shell 1 and a tab connecting piece 23 connected to the tab, the mounting bracket 4 forms a limiting portion 41, the tab connecting piece 23 is fixedly connected to one side of the mounting bracket 4, and the electrode connecting piece 22 is arranged in the limiting portion 41.

[0280] It can be understood that arranging the electrode connecting piece 22 in the limiting portion 41 can limit the electrode connecting piece 22, improve the installation stability of the electrode connecting piece 22, and enable the electrode connecting piece 22 and the tab connecting piece 23 to be stably connected.

[0281] For example, the tab connecting piece 23 is fixedly connected to the lower surface of the mounting bracket 4.

[0282] In some embodiments, referring to Figure 14 and Figure 15 The limiting portion 41 comprises a limiting groove 411 formed with a connecting hole, the electrode connecting piece 22 comprises oppositely arranged first and second ends, the first end of the electrode connecting piece 22 is arranged in the connecting hole and connected to the tab connecting piece 23, and the second end of the electrode connecting piece 22 is arranged in the slot of the limiting groove 411 and connected to the shell 1.

[0283] It can be understood that the electrode connecting piece 22 is arranged in the connecting hole of the limiting groove 411 and connected with the tab connecting piece 23, which improves the convenience of the connection between the electrode connecting piece 22 and the tab connecting piece 23. The electrode connecting piece 22 can also be arranged in the slot to be connected with the shell 1, which is simple and convenient.

[0284] In some embodiments, referring to Figure 14 and Figure 15 , the limiting groove 411 is filled with the packaging part 3.

[0285] It can be understood that the limiting groove 411 is used to accommodate the packaging part 3, and the limiting groove 411 can limit the packaging part 3, so that the packaging part 3 can be stably arranged in the limiting groove 411, which is beneficial to the setting and forming of the packaging part 3.

[0286] The tab connecting piece 23, the electrode connecting piece 22 and the wall surface of the limiting groove 411 can surround to form a space for accommodating the packaging part 3. The limiting groove 411 is provided with the packaging part 3, and the packaging part 3 can encapsulate and isolate the connection between the electrode connecting piece 22 and the tab connecting piece 23. At the same time, the limiting groove 411 limits the packaging part 3, so that the packaging part 3 can better encapsulate and isolate the connection between the electrode connecting piece 22 and the tab connecting piece 23.

[0287] In some embodiments, referring to Figure 1 , the battery further comprises an electrode assembly, and the shell 1 is formed with a mounting cavity 11, and the electrode assembly is mounted in the mounting cavity 11.

[0288] Specifically, the shell 1 is formed with a retracted part 12, the retracted part 12 protrudes into the mounting cavity 11, the connecting piece 2 is located between the retracted part 12 and the electrode assembly, and the connecting piece 2 connects the positive tab of the electrode assembly and the retracted part 12, so that the connecting piece 2 can connect the positive tab of the battery and the shell 1 together.

[0289] Specifically, the connecting piece 2 is located between the electrode assembly and the inner bottom wall of the shell 1, and the connecting piece 2 connects the negative tab of the electrode assembly and the inner bottom wall of the shell 1, so that the connecting piece 2 can connect the negative tab of the battery and the shell 1 together.

[0290] In some examples, the shell 1 has an open end and a closed end, and the bottom of the shell 1 opposite to the open end is provided with a terminal hole, and a terminal insulated and sealedly connected with the shell 1 by an insulating piece is arranged in the terminal hole.

[0291] In some examples, the shell 1 is a steel shell, and the position of the shell 1 at least in contact with the electrode connecting piece 22 is plated with a nickel layer, the tab connecting piece 23 is copper, the tab connected with the tab connecting piece 23 is copper, and the electrode connecting piece 22 is nickel.

[0292] In some examples, the inner wall of the shell 1 is coated with nickel, and the outer wall of the shell 1 can also be coated with a nickel layer.

[0293] In some embodiments, the tab connector 23 is spaced apart from the inner recess 12.

[0294] It can be understood that the tab connector 23 is spaced apart from the inner recess 12, and the tab connector 23 does not directly contact the inner recess 12, reducing the connection points of the connector 2 and the shell 1, and avoiding corrosion and other problems caused by the contact between the tab connector 23 and the inner recess 12.

[0295] In some embodiments, referring to Figure 16 , the connector 2 includes a tab connector 23 connected with the tab, and the side of the tab connector 23 facing the inner recess 12 is formed with a avoiding space 235 for accommodating the inner recess 12, so that the inner recess 12 is spaced apart from the tab connector 23.

[0296] It can be understood that by forming the avoiding space 235 on the side of the tab connector 23 facing the inner recess 12, the avoiding space 235 can be used to accommodate the inner recess 12 when the battery is formed, that is, the inner recess 12 protrudes into the mounting cavity 11, so that the inner recess 12 is spaced apart from the tab connector 23, avoiding contact between the inner recess 12 and the tab connector 23.

[0297] In some examples, the avoiding space 235 can be adjacent to the tab connector 23, and the avoiding space 235 can be formed by the tab connector 23.

[0298] In some embodiments, referring to Figure 17 , the side of the tab connector 23 facing the inner recess 12 is formed with an avoiding groove 236 for accommodating the inner recess 12, so that the inner recess 12 is spaced apart from the tab connector 23.

[0299] It can be understood that the avoiding groove 236 can be used to accommodate the inner recess 12 when the battery is formed, that is, the inner recess 12 protrudes into the mounting cavity 11, so that the inner recess 12 is spaced apart from the tab connector 23, avoiding contact between the inner recess 12 and the tab connector 23.

[0300] In some embodiments, the battery further includes a cover plate, and the connector 2 is electrically connected with the cover plate.

[0301] It can be understood that the connector 2 is electrically connected with the cover plate, that is, the cover plate can be electrified, which can prevent the cover plate from being corroded.

[0302] In some examples, the cover plate covers the opening of the shell 1, and a sealing member is arranged at the connection between the cover plate and the shell 1 to improve the sealing performance of the connection between the cover plate and the shell 1.

[0303] In some examples, the cover plate and the shell 1 are insulatedly connected.

[0304] In some embodiments, the encapsulation part 3 is encapsulation glue or thermoplastic film. It should be noted that the above is only an example of the type of the encapsulation part 3, and the encapsulation part 3 can also be any other suitable material.

[0305] In some embodiments, the encapsulation part 3 is irregularly shaped.

[0306] It can be understood that, when the encapsulation part 3 is arranged, in order to facilitate the arrangement of the encapsulation part 3, the fluid encapsulation part 3 can be injected into a designated position, and the encapsulation part 3 can be fixed after cooling. Therefore, the shape of the encapsulation part 3 can be irregular.

[0307] In some embodiments, the thickness of the encapsulation part 3 is uniform along the axial direction of the battery or along the radial direction of the battery, which ensures the uniformity of the encapsulation and protection effect of the encapsulation part 3.

[0308] In some embodiments, the thickness of the encapsulation part 3 is not uniform along the axial direction of the battery or along the radial direction of the battery. More encapsulation parts 3 can be arranged at positions where different structures are connected or bent, and the like, which need to be protected. That is, the thickness of the encapsulation part 3 at the positions where different structures are connected or bent, and the like, which need to be protected, can be greater than that at other positions, thereby improving the protection effect at the key positions.

[0309] In some embodiments, the thickness of the encapsulation part 3 is between 1 mm and 2 mm along the axial direction of the battery or along the radial direction of the battery.

[0310] It can be understood that, when the thickness of the encapsulation part 3 is less than 1 mm, the protection effect of the encapsulation part 3 can be insufficient, and when the thickness of the encapsulation part 3 is greater than 2 mm, it can greatly affect the overall thickness of the connecting piece 2 and cause the connecting piece 2 to be difficult to bend and form. Therefore, the thickness of the encapsulation part 3 is set to be between 1 mm and 2 mm, so that the encapsulation part 3 can have sufficient protection effect, will not greatly affect the overall thickness of the connecting piece 2, and also ensures that the connecting piece 2 can be smoothly bent and formed.

[0311] In some embodiments, referring to Figure 18 , the encapsulation part 3 includes an encapsulation layer 31 and an insulation protection layer 32.

[0312] Specifically, the encapsulation layer 31 is arranged at the connection between the electrode connecting piece 22 and the tab connecting piece 23, and the encapsulation layer 31 is located on the side of the encapsulation layer 31 away from the connection between the electrode connecting piece 22 and the tab connecting piece 23.

[0313] It can be understood that the encapsulation layer 31 plays a protective encapsulation role on the connection between the electrode connecting piece 22 and the tab connecting piece 23, and can prevent impurities from entering the connection between the electrode connecting piece 22 and the tab connecting piece 23. The insulating protective layer 32 can protect the encapsulation layer 31, so that the encapsulation layer 31 will not be affected by other substances, so that the encapsulation layer 31 can continuously play a protective encapsulation role on the connection between the electrode connecting piece 22 and the tab connecting piece 23.

[0314] Specifically, the encapsulation layer 31 is arranged at the connection between the electrode connecting piece 22 and the electrode of the battery, and the insulating protective layer 32 is connected to the side of the encapsulation layer 31 away from the connection between the electrode connecting piece 22 and the electrode.

[0315] It can be understood that the encapsulation layer 31 plays a protective encapsulation role on the connection between the electrode connecting piece 22 and the electrode of the battery, and can prevent impurities from entering the connection between the electrode connecting piece 22 and the electrode of the battery. The insulating protective layer 32 can protect the encapsulation layer 31, so that the encapsulation layer 31 will not be affected by other substances, so that the encapsulation layer 31 can continuously play a protective encapsulation role on the connection between the electrode connecting piece 22 and the electrode of the battery.

[0316] In some embodiments, the encapsulation part 3 protrudes from the connection between the electrode connecting piece 22 and the tab connecting piece 23, so that the encapsulation part 3 can better play a protective encapsulation role on the connection between the electrode connecting piece 22 and the tab connecting piece 23, and avoid impurities entering the connection between the electrode connecting piece 22 and the tab connecting piece 23.

[0317] Specifically, along the axial direction of the shell, the length of the protruding part of the encapsulation part 3 is between 0 mm and 4 mm.

[0318] It can be understood that if the length of the protruding part of the encapsulation part 3 is less than 0 mm, the protective effect of the encapsulation part 3 on the connection between the electrode connecting piece 22 and the tab connecting piece 23 is poor; if the length of the protruding part of the encapsulation part 3 is greater than 4 mm, the encapsulation part 3 is easy to affect the sealing of the shell of the battery. Therefore, the length of the protruding part of the encapsulation part 3 is set to be between 0 mm and 4 mm.

[0319] In some embodiments, the encapsulation part 3 protrudes from the connection between the electrode connecting piece 22 and the electrode of the battery, so that the encapsulation part 3 can better play a protective encapsulation role on the connection between the electrode connecting piece 22 and the electrode of the battery, and avoid impurities entering the connection between the electrode connecting piece 22 and the electrode of the battery.

[0320] Specifically, along the axial direction of the shell, the length of the protruding part of the encapsulation part 3 is between 0 mm and 4 mm.

[0321] It can be understood that if the length of the protruding part of the packaging part 3 is less than 0 mm, the protection effect of the packaging part 3 on the connection between the electrode connecting piece 22 and the electrode of the battery is poor; if the length of the protruding part of the packaging part 3 is greater than 4 mm, the packaging part 3 is easy to affect the sealing of the shell of the battery. Therefore, the length of the protruding part of the packaging part 3 is set to be between 0 mm and 4 mm.

[0322] In some embodiments, the connecting piece 2 is a symmetrical structure.

[0323] It should be noted that the connecting piece 2 being a symmetrical structure means that most of the structure of the connecting piece 2 is symmetrical, that is, it does not mean that the connecting piece 2 is completely symmetrical in structure.

[0324] In some examples, the connecting piece 2 can be a central symmetrical structure.

[0325] According to the embodiments of the second aspect of the application, the electric device includes the battery described above.

[0326] According to the electric device of the embodiments of the application, by arranging the packaging part at the connection between the connecting piece and the inner part, the packaging part can prevent impurities from entering the connection between the connecting piece and the inner part, avoid the impurities affecting the connection strength of the connecting piece and the inner part, improve the connection stability of the connecting piece and the inner part, so that the connecting piece can stably connect the shell and the tab, thereby improving the connection stability between the tab and the shell.

[0327] It should be noted that the electric device can be a vehicle, an aircraft, or a household appliance. It should be noted that the foregoing is only an example of the electric device, and does not specially limit the electric device.

[0328] The embodiments of the application are described in detail above, and the specific examples are applied to the principles and implementation modes of the application. The above description of the embodiments is only used to help understand the method of the application and its core idea; at the same time, for those skilled in the art, according to the idea of the application, the specific implementation mode and application range will be changed, and the above description should not be understood as limiting the application.

Claims

1. A battery, characterized by, The battery comprises: a shell formed with a recessed portion protruding towards an inner space of the shell; a connecting member connecting a surface of the recessed portion facing the inner space of the shell and a tab; an encapsulating portion at least partially provided at a connection between the connecting member and the recessed portion.

2. The battery of claim 1, wherein, The connecting member comprises an electrode connecting member and a tab connecting member connected in sequence, the electrode connecting member is connected with the recessed portion, and the tab connecting member is connected with the tab.

3. The battery of claim 2, wherein, The encapsulating portion is provided at least partially at the electrode connecting member; and / or, the encapsulating portion is provided at least partially at the tab connecting member.

4. The battery of claim 2, wherein, A first end of the electrode connecting member is connected with the tab connecting member, and a second end of the electrode connecting member is connected with the recessed portion and is spaced apart from the tab connecting member.

5. The battery of claim 2, wherein, The battery further comprises an electrode assembly, the shell is formed with a mounting cavity, the electrode assembly is provided in the mounting cavity, and the connecting member is provided at one side of the recessed portion, wherein, at least part of the electrode connecting member is connected to one side of the recessed portion facing the electrode assembly; and / or, at least part of the electrode connecting member is connected to one side of the recessed portion away from the electrode assembly.

6. The battery of claim 2, wherein, The connection position of the electrode connecting member and the tab connecting member, and the connection position of the electrode connecting member and the shell, are located at different sides of the electrode connecting member.

7. The battery of claim 2, wherein, The encapsulating portion is provided at a connection between the electrode connecting member and the recessed portion.

8. The battery of claim 5, wherein, The shell comprises a shell body and the recessed portion connected to the shell body; along a radial direction of the shell, at least part of the electrode connecting member protrudes from the tab connecting member and is connected with the shell body.

9. The battery of claim 8, wherein, An included angle is formed between one side of the recessed portion facing the electrode assembly and the shell body, and the included angle is between 0 degrees and 150 degrees.

10. The battery of claim 2, wherein, The minimum distance between the tab connecting member and the recessed portion is greater than 0.05 mm.

11. The battery of any one of claims 2 to 10, wherein, The electrode connecting member comprises a first connecting segment and a second connecting segment connected in sequence, the first connecting segment is connected with the tab connecting member, and the second connecting segment is connected with the recessed portion.

12. The battery of claim 11, wherein, An encapsulating portion is provided between the first connecting segment and the second connecting segment, a first end of the encapsulating portion extends along a surface of the first connecting segment and is connected with the second connecting segment, and a second end of the encapsulating portion extends along the surface of the first connecting segment and is connected with the tab connecting member.

13. The battery of claim 11, wherein, Along an axial direction of the shell, the height of the contact position of the encapsulating portion and the second connecting segment is A9, and A9≥0.1 mm.

14. The battery of claim 11, wherein, Along a radial direction of the shell, the length of the contact position of the encapsulating portion and the tab connecting member is A7, and A7≥0.3 mm.

15. The battery of claim 11, wherein, A first end of the first connecting segment is overlapped with the tab connecting member, and a second end of the first connecting segment protrudes or is bent away from the tab connecting member relative to the first end of the first connecting segment.

16. The battery of claim 11, wherein, Along a radial direction of the shell, at least part of the first connecting segment protrudes from the tab connecting member and is connected with a side wall of the shell.

17. The battery of claim 16, wherein, The first connecting section protrudes from the part of the shell, the tab connecting piece and the side wall of the shell to form a containing space for containing the encapsulation part.

18. The battery of claim 11, wherein, The shell comprises a shell body and the retracted part connected to the shell body. The second connecting section comprises a first connecting section and a second connecting section connected in sequence, the first connecting section is connected with the first connecting section, and the second connecting section is connected with the retracted part.

19. The battery of claim 11, wherein, The electrode connecting piece further comprises a third connecting section connecting the first connecting section and the second connecting section.

20. The battery of claim 19, wherein, The third connecting section is spaced apart from the shell.

21. The battery of claim 19, wherein, The first end of the third connecting section is connected with the first connecting section, the second end of the third connecting section is bent towards the first connecting section relative to the first end of the third connecting section, and the second end of the third connecting section and the first connecting section are provided with an encapsulation part.

22. The battery of claim 19, wherein, The first end of the third connecting section is connected with the first connecting section, the second end of the third connecting section is connected with the second connecting section, and along the direction away from the tab connecting piece, the second end of the third connecting section extends to the side wall surface of the shell and abuts against the side wall surface of the shell.

23. The battery of claim 22, wherein, Along the radial direction of the shell, the length of the third connecting section is C8, C8≥0.5mm.

24. The battery of claim 19, wherein, The second connecting section is spaced apart from the tab connecting piece.

25. The battery of claim 19, wherein, The shortest distance between the second connecting section and the tab connecting piece is B8, B8≥0.1mm.

26. The battery of claim 19, wherein, The end surface of the first connecting section close to the side wall of the shell is flush with the end surface of the tab connecting piece close to the side wall of the shell. The side of the third connecting section away from the second connecting section is provided with the encapsulation part between the tab connecting piece, and the tab connecting piece and the third connecting section are connected with the encapsulation part at the same time.

27. The battery of claim 22, wherein, The contact size of the encapsulation part with the third connecting section is C5, C5≥0.3mm.

28. The battery of any one of claims 2 to 10, wherein, The tab connecting piece comprises a first tab connecting piece and a second tab connecting piece, the first tab connecting piece is connected to the end of the second tab connecting piece, the second tab connecting piece is used for connecting the tab, and the electrode connecting piece is connected to the side of the first tab connecting piece away from the second tab connecting piece.

29. The battery of claim 28, wherein, The first tab connecting piece, the electrode connecting piece and the shell form a containing space for containing the encapsulation part.

30. The battery of claim 28, wherein, The first end of the first tab connecting piece is connected with the second tab connecting piece, and the second end of the first tab connecting piece extends in the direction towards the retracted part to protrude from the second tab connecting piece.

31. The battery of claim 28, wherein, The end of the first tab connecting piece away from the second tab connecting piece is provided with the encapsulation part at the connection with the electrode connecting piece.

32. The battery of claim 31, wherein, The first end of the encapsulation part extends along the first tab connecting piece, and the second end of the encapsulation part extends along the electrode connecting piece.

33. The battery of claim 28, wherein, The first tab connector is formed with a receiving groove, part of the electrode connector is located in the receiving groove, and the other part of the electrode connector protrudes from the receiving groove and is connected with the shell.

34. The battery of claim 33, wherein, The first tab connector is in a bent structure.

35. The battery of claim 34, wherein, The bent part of the first tab connector is provided with an encapsulation part.

36. The battery of claim 33, wherein, The first tab connector comprises a first end and a second end arranged oppositely, the first end of the first tab connector is connected with the second tab connector, and the second end of the first tab connector is arranged in a bent manner relative to the first end of the first tab connector.

37. The battery of claim 36, wherein, The encapsulation part is arranged between the first end of the first tab connector and the side wall of the shell, and / or the encapsulation part is arranged between the second end of the first tab connector and the retracted part.

38. The battery of claim 33, wherein, The bending angles of the first tab connector, the electrode connector and the retracted part are the same.

39. The battery of any one of claims 2 to 10, wherein, The tab connector and the electrode connector are integrally formed.

40. An electrical device, comprising: A battery comprising the battery as claimed in any one of claims 1 to 39.

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