Secondary battery, battery pack and electric equipment

Abstract

The utility model discloses a secondary battery, a battery pack and electric equipment, and belongs to the technical field of batteries, the secondary battery comprises a shell, an electrode assembly, a top cover plate and a connecting terminal, the shell is provided with an accommodating cavity and an opening communicated with the accommodating cavity; the electrode assembly is arranged in the accommodating cavity and comprises a main body and a tab arranged on the main body, and one end of the tab is connected with the main body; the top cover sheet is connected with the shell and covers the opening; the connecting terminal is arranged on the top cover plate, the connecting terminal comprises a body part and a plurality of connecting parts integrally connected with the body part, the body part partially penetrates through the top cover plate, the plurality of connecting parts are located on one side, close to the electrode assembly, of the body part, the plurality of connecting parts are arranged at intervals, and the plurality of connecting parts are connected with the tab in an abutting mode. According to the invention, the connection terminal can be stably connected with the tab through the arrangement of the connection part which can abut against the tab, welding is not needed, and the generation of metal chips is reduced.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to secondary batteries and electrical equipment. Background Technology

[0002] The tabs and terminals of a secondary battery are usually connected by welding to achieve electrical connection between them.

[0003] However, during the welding process, metal shavings are easily generated. The trajectory of these shavings is uncontrollable and they are difficult to completely remove. Metal shavings that are not removed before the core is joined can cause short circuits in the secondary battery during use, reducing the reliability and lifespan of the secondary battery. Utility Model Content

[0004] The purpose of this utility model is to provide a secondary battery to solve the technical problem of metal shavings easily generated during the welding process of the tabs and terminals; another purpose of this application is to provide a battery pack; another purpose of this application is to provide an electrical device.

[0005] Technical solution: This application provides a secondary battery, comprising:

[0006] A housing having a receiving cavity and an opening communicating with the receiving cavity;

[0007] An electrode assembly is disposed in the receiving cavity. The electrode assembly includes a main body and an electrode tab disposed on the main body, with one end of the electrode tab connected to the main body.

[0008] A top cover plate, which is connected to the housing and seals the opening; a connecting terminal, disposed on the top cover plate, the connecting terminal including a body portion and a plurality of connecting portions connected to the body portion, a portion of the body portion passing through the top cover plate, the body portion having a first connecting surface facing the electrode tab, the plurality of connecting portions protruding from the first connecting surface, the plurality of connecting portions being spaced apart, and the plurality of connecting portions abutting and connecting with the electrode tab.

[0009] In some embodiments, the secondary battery has a first direction, a second direction, and a third direction that are perpendicular to each other in pairs. A plurality of connecting portions protrude along the first direction and are disposed on the first connecting surface. The tabs extend along the second direction, the connecting portions extend along the second direction, the plurality of connecting portions are spaced apart along the third direction, a gap is formed between adjacent connecting portions along the third direction, and the tabs are clamped in the gap.

[0010] In some embodiments, the connecting portion has two guide surfaces, which are respectively located on both sides of the connecting portion along the third direction, and the guide surfaces are inclined relative to the first direction, and at least one guide surface is connected to the tab.

[0011] In some embodiments, the connecting portion is connected to the first connecting surface, and two adjacent guide surfaces located on the first connecting surface along the third direction are connected to the first connecting surface; the first connecting surface has a groove extending along the second direction, the groove communicating with the gap, and the groove having a groove wall; along the third direction, the groove is disposed between adjacent connecting portions, and the groove wall is connected to two guide surfaces of adjacent connecting portions facing each other along the third direction Z.

[0012] In some embodiments, the secondary battery has a first direction, a second direction, and a third direction that are perpendicular to each other in pairs. The tabs extend along the second direction, the connecting portions extend along the second direction, and a plurality of the connecting portions are spaced apart along the third direction. The connecting portions are capable of elastically deforming toward the body portion along the first direction to connect the tabs.

[0013] In some embodiments, the first direction, the second direction, and the third direction are perpendicular to each other.

[0014] In some embodiments, the connecting portion includes a deformable end and a pressing end connected along the second direction, the deformable end being connected to the body portion, and the deformable end being capable of elastic deformation so that the pressing end can move toward the body portion.

[0015] In some embodiments, a plurality of the connecting portions are spaced apart along the second direction.

[0016] In some embodiments, the secondary battery further includes a connecting layer disposed between the connecting portion and the electrode tab, the connecting layer electrically connecting the connecting portion and the electrode tab.

[0017] In some embodiments, the body portion and the connecting portion are an integral structure.

[0018] Accordingly, this application also provides a battery pack, including a secondary battery as described in any of the above embodiments.

[0019] Accordingly, this application also provides an electrical device, including a secondary battery as described in any of the above embodiments, or including a battery pack as described in any of the above embodiments.

[0020] Beneficial Effects: Compared with the prior art, the secondary battery provided in this application includes a casing, an electrode assembly, a top cover, and connecting terminals. The casing has a receiving cavity and an opening communicating with the receiving cavity. The electrode assembly is disposed in the receiving cavity and includes a main body and tabs disposed on the main body, with one end of the tabs connected to the main body. The top cover is connected to the casing and seals the opening. The connecting terminals are disposed on the top cover and include a main body and multiple connecting parts integrally connected to the main body. Parts of the main body pass through the top cover, and the multiple connecting parts are located on the side of the main body closer to the electrode assembly. The multiple connecting parts are spaced apart and abut against the tabs. This application enables the connecting terminals to stably connect with the tabs by providing connecting parts that can abut against them, eliminating the need for welding and reducing the generation of metal shavings. Attached Figure Description

[0021] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the structure of a secondary battery provided in an embodiment of this application;

[0023] Figure 2 This is a front view of the top cover and terminals in a secondary battery according to an embodiment of this application;

[0024] Figure 3 A top view of the top cover and terminals in a secondary battery provided in an embodiment of this application;

[0025] Figure 4 As an example, in Figure 3 Sectional view at point AA;

[0026] Figure 5 for Figure 4 Detailed view of point B in the middle circle;

[0027] Figure 6 For another embodiment in Figure 3 Sectional view at point AA;

[0028] Figure 7 for Figure 6 Detailed view of point C in the middle circle;

[0029] Figure 8 When the connection terminal of the secondary battery provided in the embodiments of this application is connected to the electrode assembly, Figure 6 A schematic diagram at point C in the middle circle;

[0030] Figure 9 This is a schematic diagram of the structure of the top cover plate and the electrode post in a secondary battery according to an embodiment of this application;

[0031] Figure 10 for Figure 9 Detailed view of point D in the middle circle;

[0032] Figure 11 A front view of the top cover and terminal posts in a secondary battery provided in another embodiment of this application;

[0033] Figure 12 for Figure 11 Detailed view of point E in the middle circle;

[0034] Figure 13 This is a schematic diagram of the structure of the top cover plate and the electrode post in a secondary battery according to another embodiment of this application;

[0035] Figure 14 for Figure 13 Detailed view of point F in the middle circle.

[0036] Reference numerals in the attached drawings: 1-shell, 11-receiving cavity, 12-opening, 2-electrode assembly, 21-body, 22-electrode tab, 3-top cover plate, 4-connecting terminal, 41-body part, 411-first connecting surface, 42-connecting part, 421-guide surface, 423-second connecting surface, 424-deformation end, 425-extrusion end, 43-gap, 44-groove, 441-groove wall, 5-connecting layer. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0038] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for mutual communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. In the description of this application, "multiple" means two or more, unless otherwise expressly and specifically limited. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0039] It should be noted that, in the description of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering. For example, if the angle between two directions is 80° to 90°, the two directions can be considered perpendicular; if the angle between two directions is 0° to 10°, the two directions can be considered parallel.

[0040] It should also be noted that in the accompanying drawings of the embodiments of this application, the arrows labeled X, Y, and Z respectively represent the first direction X, the second direction Y, and the third direction Z. The description of this application introduces the first direction X, the second direction Y, and the third direction Z to more clearly express the relative positional relationship involved in this application. The first direction X, the second direction Y, and the third direction Z are three intersecting relative directions, not absolute directions. In practical applications, the first direction X, the second direction Y, and the third direction Z can point to any direction in space, as long as the intersection relationship between them is maintained.

[0041] The following disclosure provides many different implementations or examples for carrying out different structures of this application. To simplify the disclosure of this application, the components and arrangements of specific examples are described below. Of course, these are merely examples and are not intended to limit this application.

[0042] The tabs 22 and terminals of a secondary battery are usually connected by welding to achieve electrical connection between the tabs 22 and terminals and avoid open circuit between the terminals and tabs 22.

[0043] However, during the welding process, metal shavings are easily generated. The trajectory of these shavings is uncontrollable and they are difficult to completely remove. Metal shavings that are not removed before the core is joined can cause short circuits in the secondary battery during use, reducing the reliability and lifespan of the secondary battery.

[0044] To address the technical problem of metal shavings being easily generated during the welding process of the tab 22 and the terminal post, this application also provides a secondary battery. Please refer to [link to relevant documentation]. Figure 1 , Figure 9 and Figure 13The device includes a housing 1, an electrode assembly 2, a top cover 3, and a connecting terminal 4. The housing 1 has a receiving cavity 11 and an opening 12 communicating with the receiving cavity 11. The electrode assembly 2 is disposed in the receiving cavity 11 and includes a main body 21 and an electrode tab 22 disposed on the main body 21. One end of the electrode tab 22 is connected to the main body 21. The top cover 3 is connected to the housing 1 and covers the opening 12. The connecting terminal 4 is disposed on the top cover 3 and includes a body portion 41 and a plurality of connecting portions 42 connected to the body portion 41. A portion of the body portion 41 passes through the top cover 3. The body portion 41 has a first connecting surface 411 facing the electrode tab 22. The plurality of connecting portions 42 protrude from the first connecting surface 411 and are spaced apart. The plurality of connecting portions 42 abut against and connect with the electrode tab 22.

[0045] Specifically, the top cover plate 3 is disposed on the side of the tab 22 away from the main body 21 along the first direction X, and the top cover plate 3 is connected to the housing 1 and covers the opening 12. The top cover plate 3 has a through hole that penetrates the top cover plate 3 along the first direction X.

[0046] Specifically, the tab 22 is connected to the side of the body 21 facing the top cover plate 3 along the first direction X; in some embodiments, the body 21 has one or more tabs 22 on the side of the body 21 facing the top cover plate 3 along the first direction X, and the top cover plate 3 has one or more connection terminals 4.

[0047] It is understood that in some embodiments, the connecting portion 42 abuts against the tab 22, and a portion of the connecting portion 42 can deform away from the electrode assembly 2 along the first direction X; in other embodiments, a portion of the tab 22 can undergo elastic deformation due to the compression of the connecting portion 42, so as to connect more tightly with the connecting portion 42; in still other embodiments, a portion of the connecting portion 42 can deform away from the electrode assembly along the first direction X, while a portion of the tab 22 can deform. Specifically, in some embodiments, the deformation of the connecting portion 42 is elastic deformation; in other embodiments, the deformation of the tab 22 is elastic deformation; in still other embodiments, the deformations of both the connecting portion 42 and the tab 22 are elastic deformations.

[0048] In some embodiments, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other, and a plurality of connecting portions 42 are arranged along the second direction Y; in other embodiments, a plurality of connecting portions 42 are arranged along the third direction Z; in other embodiments, a plurality of connecting portions 42 are perpendicular to the first direction X and inclined to the second direction Y and the third direction Z.

[0049] It is understood that by providing a connecting portion 42 on the side of the body portion 41 near the electrode assembly 2 along the first direction X, the distance between the connecting terminal 4 and the tab 22 is reduced, thereby enabling the connecting terminal 4 to abut against the tab 22 and deform to make the connection between the connecting terminal 4 and the tab 22 tighter and more stable. In the above embodiment, replacing welding with abutting means can avoid the generation of metal shavings due to welding during the connection of the connecting terminal 4 and the tab 22, reducing the possibility of short circuits in the secondary battery during use. At the same time, the integrally formed body portion 41 and connecting portion 42 can also reduce the connection process between the body portion 41 and the connecting portion 42, thereby avoiding the generation of metal shavings that could cause short circuits in the secondary battery due to welding the body portion 41 and the connecting portion 42.

[0050] In some embodiments, please refer to Figure 2 , Figure 3 , Figure 8 , Figure 9 and Figure 10 The secondary battery has a first direction X, a second direction Y and a third direction Z that are perpendicular to each other. The tab 22 extends along the second direction Y, the connecting part 42 extends along the second direction Y, and multiple connecting parts 42 are spaced apart along the third direction Z. A gap 43 is formed between adjacent connecting parts 42 along the third direction Z, and the tab 22 is sandwiched in the gap 43.

[0051] In some embodiments, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0052] It is understood that, in some embodiments, please refer to Figure 8 The gap 43 can accommodate a portion of the tab 22 so that the portion of the tab 22 located within the gap 43 can be connected to the connecting portion 42, thereby ensuring a passage between the tab 22 and the connecting portion 42.

[0053] It is understandable that when the connecting part 42 extends along the second direction Y, that is, when it extends in the same direction as the tab 22, the tab 22 is more likely to enter the gap 43 extending along the second direction Y.

[0054] In the above embodiment, the portion of the tab 22 away from the main body 21 can extend into the gap 43 in the direction away from the main body 21, so as to increase the connection area between the tab 22 and the connecting part 42, thereby making the connection between the connecting part 42 and the tab 22 more reliable and stable, and at the same time, it can also increase the current flow capacity from the tab 22 to the connecting part 42.

[0055] In some embodiments, please refer to Figure 4 , Figure 5 , Figure 6 and Figure 7The connecting part 42 has two guide surfaces 421, which are located on both sides of the connecting part 42 along the third direction Z. The guide surfaces 421 are inclined relative to the first direction X. At least one guide surface 421 is connected to the tab 22. It should be noted that a gap 43 is formed between two adjacent connecting parts 42, and the tab 22 is sandwiched in the gap 43. For the connecting part 42 located in the middle part, both guide surfaces 421 are connected to the tab 22. For the connecting parts 42 located at both ends, only the guide surface 421 closer to the middle part of the connecting part 42 is connected to the tab 22.

[0056] It is understandable that the guide surfaces 421 of the adjacent connecting portions 42 form a gap 43. Since the connecting portion 42 extends along the second direction Y, the guide surface 421 is also the surface of the connecting portion 42, and the guide surface 421 also extends along the second direction Y.

[0057] Specifically, the two guide surfaces 421 of the same connecting part 42 gradually move closer together along the first direction X in a direction away from the main body part 41.

[0058] In some embodiments, the guide surface 421 of the same connecting portion 42 is connected to the end away from the body portion 41 along the first direction X; in other embodiments, please refer to Figure 7 The connecting portion 42 also has a second connecting surface 423, which is disposed between and connects the two guide surfaces 421. Specifically, in some embodiments, the second connecting surface 423 is an arc surface, and in other embodiments, the second connecting surface 423 is a plane. By providing the second connecting surface 423, damage to the tab 22 caused by the direct connection of the guide surfaces 421 can be avoided. In addition, the second connecting surface 423 can also increase the connection area between the same connecting portion 42 and the tab 22.

[0059] In the above embodiment, by providing a guide surface 421 that is inclined relative to the first direction X to connect with the tab 22 entering the gap 43, the connection area between the connecting part 42 and the tab 22 is increased, so that the flow capacity from the tab 22 to the connecting part 42 is increased.

[0060] In some embodiments, please refer again Figure 6 and Figure 7 The connecting portion 42 is connected to the first connecting surface 411, and two adjacent guide surfaces 421 located on the first connecting surface 411 along the third direction Z are connected to the first connecting surface 411; the first connecting surface 411 has a groove 44 extending along the second direction Y, the groove 44 communicates with the gap 43, and the groove 44 has a groove wall 441; along the third direction Z, the groove 44 is disposed between adjacent connecting portions 42, and the groove wall 441 is connected to the two guide surfaces 421 facing each other along the third direction Z of the adjacent connecting portions 42.

[0061] It is understandable that setting the groove 44 can increase the depth of the gap 43 along the first direction X, thereby making the space of the gap 43 larger and avoiding the electrode 22 from stacking on each other in the gap 43 due to the limited space of the gap 43, which would reduce the contact area between the electrode 22 and the guide surface 421.

[0062] In the above embodiment, by providing a groove 44 to further increase the contact area between the tab 22 and the connecting part 42, the connection between the connecting part 42 and the tab 22 becomes more reliable, and the current flow capacity from the tab 22 to the connecting part 42 is improved.

[0063] In some embodiments, please refer to Figure 13 and Figure 14 The secondary battery has a second direction Y and a third direction Z. The tab 22 extends along the second direction Y, the connecting part 42 extends along the second direction Y, and multiple connecting parts 42 are spaced apart along the third direction Z. The connecting part 42 can generate elastic deformation along the first direction X towards the body part 41 to connect the tab 22. The first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0064] Understandably, after elastic deformation occurs, the connecting portion 42 can return to its original shape along the first direction X away from the body portion 41. In the above embodiment, even if the connection between the top cover plate 3 and the housing 1 becomes loose, increasing the distance between the body portion 41 and the electrode tab 22 along the first direction X, the connecting portion 42, which can return to its original shape, can still maintain its connection with the electrode tab 22, thereby making the connection between the connecting portion 42 and the electrode tab 22 more reliable.

[0065] In the above embodiments, the elastic potential energy of the connecting part 42 is utilized to ensure that the connecting part 42 and the tab 22 can still have good connection reliability without welding, thus improving the reliability of the secondary battery.

[0066] In some embodiments, please refer again Figure 10 and Figure 11 The connecting part 42 includes a deformable end 424 and a pressing end 425 connected along the second direction Y. The deformable end 424 is connected to the body part 41. The deformable end 424 can generate elastic deformation so that the pressing end 425 can move toward the body part 41.

[0067] In some embodiments, one end of the extrusion end 425 along the second direction Y is connected to the deformation end 424, and the other end of the extrusion end 425 along the second direction Y is spaced apart from the body portion 41. It is understood that only the extrusion end 425, which is connected to the deformation end 424 at one end, can obtain a greater degree of elastic deformation in the first direction X. In other embodiments, the extrusion end 425 is located between the two deformation ends 424 along the second direction and is connected to the two deformation ends 424 respectively.

[0068] In the above embodiment, by providing a deformation end 424 capable of elastic deformation, the connecting portion 42 acquires the ability to elastically deform along the first direction X. Furthermore, by providing a compression end 425 to compress the tab 22, higher connection reliability is achieved.

[0069] In some embodiments, please refer to Figure 14 Multiple connecting parts 42 are spaced apart along the second direction Y.

[0070] Specifically, the connecting portions 42 are symmetrically arranged at intervals along the second direction Y. In some embodiments, the deformable ends 424 of two adjacent connecting portions 42 along the second direction Y are adjacent; in other embodiments, the extruded ends 425 of two adjacent connecting portions 42 along the second direction Y are adjacent.

[0071] In the above embodiments, by providing multiple connecting parts 42, the contact area between the connecting parts 42 and the tabs 22 can be increased. At the same time, providing multiple connecting parts 42 can also ensure that the connecting parts 42 have a large contact area with the tabs 22, so that the connecting parts 42 have more deformable ends 424, thereby enabling the connecting parts 42 to obtain better elastic deformation capability.

[0072] In some embodiments, please refer to Figure 7 and Figure 12 The secondary battery has a first direction X. Along the first direction X, the side of the connecting part 42 away from the main body part 41 has a maximum distance H mm from the connecting surface 411, satisfying: 0.1 mm ≤ H ≤ 3 mm.

[0073] In the above embodiments, the maximum dimension H of the connecting portion 42 along the first direction X can be any one value or a range between any two values ​​from 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, and 3.0mm. Understandably, the larger the value of H, the greater the compression of the tab 22 when the connecting part 42 contacts the tab 22, resulting in a larger connection area and a tighter connection between them. This means stronger current-carrying capacity and better connection reliability between the connecting part 42 and the tab 22. Conversely, the smaller the value of H, the higher the space utilization rate within the accommodating cavity 11 and the greater the volumetric energy density. When the maximum dimension H of the connecting part 42 along the first direction X is within the range defined in the embodiments of this application, better reliability and current-carrying capacity can be achieved between the connecting part 42 and the tab 22, and the secondary battery can also achieve a larger volumetric energy density.

[0074] In some embodiments, please refer to Figure 12 The thickness of the connecting part 42 is h mm, which satisfies the condition: 0.05 mm ≤ h ≤ 1 mm.

[0075] Specifically, the thickness of the connecting portion 42 is such that the connecting portion 42 has the minimum dimension along the first direction X.

[0076] In the above embodiments, the thickness h of the connecting portion 42 can be any one value or a range between any two values ​​from 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, and 1mm. It is understood that the larger the value of h, the better the mechanical properties of the deformable end 424, and the greater the degree of elastic deformation of the connecting portion 42, resulting in a tighter connection between the connecting portion 42 and the tab 22, and better connection reliability; the smaller the value of h, the higher the space utilization rate within the receiving cavity 11 and the greater the volumetric energy coefficient. When the minimum dimension h of the connecting part 42 along the first direction X is within the range defined in the embodiments of this application, the connecting part 42 and the tab 22 can obtain better connection reliability and overcurrent capability, and the secondary battery can also obtain a larger volumetric energy density.

[0077] In some embodiments, please refer to Figure 8 The secondary battery also includes a connecting layer 5, which is located and connected between the connecting part 42 and the electrode 22, and the connecting layer 5 is electrically connected to the connecting part 42 and the electrode 22.

[0078] In some embodiments, the connecting layer 5 is made of conductive adhesive.

[0079] In some embodiments, a connecting layer 5 is provided between all connecting portions 42 and tabs 22; in other embodiments, a connecting layer 5 is provided between some tabs 22 and connecting portions 42, while no connecting layer 5 is provided between other tabs 22 and connecting portions 42.

[0080] In the above embodiments, by providing the connection layer 5, the connection stability between the connection part 42 and the tab 22 can be increased, and the current carrying capacity between the tab 22 and the connection part 42 can also be expanded.

[0081] In some embodiments, the secondary battery has a first direction X, and the connecting portion 42 has a second connecting surface 423 facing the body 21 along the first direction X. The second connecting surface 423 is used to connect with the electrode tab 22. The sum of the areas of the second connecting surfaces 423 of all the connecting portions 42 of a connecting terminal 4 is S, which satisfies: 20mm. 2 ≤S≤1600mm 2 .

[0082] In the above embodiment, the sum S of the areas S of the second connecting surfaces 423 of all connecting portions 42 of a connecting terminal 4 can be 20 mm. 2 30mm 2 40mm 2 50mm 2 60mm 2 70mm 2 80mm 2 90mm 2 100mm 2 200mm 2 300mm 2 400mm 2 500mm 2 600mm 2 700mm 2 800mm 2 900mm 2 1000mm 2 1100mm 2 1200mm 2 1300mm 2 1400mm 2 1500mm 2 1600mm2 The range between any one or any two values ​​in the range.

[0083] Specifically, the area of ​​the second connecting surface 423 of all connecting portions 42 of a connecting terminal 4 can be measured using a visual dimension inspection device.

[0084] It is understandable that the larger the value of S, the larger the connection area between the portion of the tab 22 near the main body 21 and the connecting portion 42, and the stronger the current-carrying capacity of the portion of the tab 22 near the main body 21 and the connecting portion 42; the smaller the value of S, the larger the dimension of the gap 43 along the third direction Z, the larger the connection area between the portion of the tab 22 that is raised away from the main body 21 and the connecting portion 42, and the stronger the current-carrying capacity of the raised portion of the tab 22 and the connecting portion 42; when the value of S is within the range defined in the embodiments of this application, the portion of the tab 22 located in the gap 43 and the portion connected to the second connecting surface 423 both have a large connection area with the connecting portion 42, and the current-carrying capacity between the tab 22 and the connecting portion 42 is strong. And when the sum of the areas S of the second connecting surfaces 423 of all the connecting portions 42 of a connecting terminal 4 is within the range defined in the embodiments of this application, a good current-carrying capacity can be obtained between the connecting portion 42 and the tab 22.

[0085] In some embodiments, the body portion 41 and the connecting portion 42 are an integral structure.

[0086] Specifically, the main body 41 and the connecting part 42 are an integral structure, that is, the main body 41 and the connecting part 42 are integrally formed.

[0087] In some embodiments, the connection between the integrally connected connecting part 42 and the body part 41 has better connection reliability, and the connection between the connecting part 42 and the body part 41 is less prone to failure.

[0088] Accordingly, this application also provides a battery pack including a secondary battery as described in any of the above embodiments.

[0089] Accordingly, this application also provides an electrical device, including a secondary battery as described in any of the above embodiments, or including a battery pack as described in any of the above embodiments.

[0090] Of course, the electrical equipment referred to in this application may include, but is not limited to, backup power supplies, electrodes, electric vehicles, electric bicycles, electric motorcycles, large storage batteries, etc.

[0091] The foregoing has provided a detailed description of a secondary battery, battery pack, and electrical device provided in the embodiments of this application. Specific examples have been used in this application to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A secondary battery, characterized in that, include: The housing (1) has a receiving cavity (11) and an opening (12) communicating with the receiving cavity (11); Electrode assembly (2), the electrode assembly (2) is disposed in the receiving cavity (11), the electrode assembly (2) includes a main body (21) and an electrode tab (22) disposed on the main body (21), one end of the electrode tab (22) is connected to the main body (21); Top cover plate (3), the top cover plate (3) is connected to the housing (1) and seals the opening (12); A connecting terminal (4) is disposed on the top cover plate (3). The connecting terminal (4) includes a body part (41) and a plurality of connecting parts (42) connected to the body part (41). A portion of the body part (41) passes through the top cover plate (3). The body part (41) has a first connecting surface (411) facing the electrode (22). The plurality of connecting parts (42) protrude from the first connecting surface (411). The plurality of connecting parts (42) are spaced apart and abut against the electrode (22).

2. The secondary battery according to claim 1, characterized in that, The secondary battery has a first direction (X), a second direction (Y), and a third direction (Z) that are perpendicular to each other. A plurality of connecting portions (42) protrude along the first direction (X) and are disposed on the first connecting surface (411). The tab (22) extends along the second direction (Y). The connecting portions (42) extend along the second direction (Y). The plurality of connecting portions (42) are spaced apart along the third direction (Z). A gap (43) is formed between adjacent connecting portions (42) along the third direction (Z). The tab (22) is sandwiched in the gap (43).

3. The secondary battery according to claim 2, characterized in that, The connecting part (42) has two guide surfaces (421), which are located on both sides of the connecting part (42) along the third direction (Z), and the guide surfaces (421) are inclined relative to the first direction (X). At least one of the guide surfaces (421) is connected to the tab (22).

4. The secondary battery according to claim 3, characterized in that, The connecting portion (42) is connected to the first connecting surface (411), and the two adjacent guide surfaces (421) located on the first connecting surface (411) along the third direction (Z) are connected to the first connecting surface (411); the first connecting surface (411) has a groove (44) extending along the second direction (Y), the groove (44) communicating with the gap (43), and the groove (44) having a groove wall (441); along the third direction (Z), the groove (44) is disposed between adjacent connecting portions (42), and the groove wall (441) is connected to the two guide surfaces (421) facing each other along the third direction (Z) of adjacent connecting portions (42).

5. The secondary battery according to claim 1, characterized in that, The secondary battery has a first direction (X), a second direction (Y), and a third direction (Z) that are perpendicular to each other. The tab (22) extends along the second direction (Y), and the connecting part (42) extends along the second direction (Y). A plurality of the connecting parts (42) are spaced apart along the third direction (Z). The connecting part (42) can elastically deform along the first direction (X) toward the body part (41) to connect the tab (22).

6. The secondary battery according to claim 5, characterized in that, The connecting part (42) includes a deformable end (424) and a pressing end (425) connected along the second direction (Y). The deformable end (424) is connected to the body part (41), and the deformable end (424) is capable of elastic deformation so that the pressing end (425) can move toward the body part (41).

7. The secondary battery according to claim 5, characterized in that, The plurality of connecting portions (42) are spaced apart along the second direction (Y).

8. The secondary battery according to claim 1, characterized in that, The secondary battery also includes a connecting layer (5), which is disposed between the connecting part (42) and the electrode (22) and electrically connects the connecting part (42) and the electrode (22).

9. The secondary battery according to claim 1, characterized in that, The main body (41) and the connecting part (42) are an integral structure.

10. A battery pack, characterized in that, The secondary battery includes any one of claims 1 to 9 above.

11. An electrical appliance, characterized in that, The secondary battery includes any one of claims 1 to 9, or the battery pack described in claim 10.

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