Secondary battery, battery pack, and electric device

Abstract

The utility model discloses a secondary battery, a battery pack and a power utilization device, the secondary battery has a first direction and comprises a shell, an electrode assembly and a top cover assembly, the shell has a containing cavity, the electrode assembly is arranged in the containing cavity, the electrode assembly comprises a battery cell and a tab, and the tab is connected with the battery cell; the top cover assembly comprises an electrode terminal, the electrode terminal comprises a body and a clamping part, the body is provided with a through hole, the through hole penetrates through the body along a first direction, and the tab is arranged in the through hole in a penetrating manner; and the clamping part is connected with the body, covers and seals the part of the through hole, and is propped against the tab. According to the secondary battery, the tabs penetrate through the through holes in the electrode terminals and are connected with the electrode terminals, so that the design of an adapter plate is omitted, the occupation of the tabs on the height space of the battery is effectively reduced, and the volume energy density of the secondary battery is favorably improved. Meanwhile, by arranging the clamping part, the tab can be clamped and fixed, the tab loosening and the tab insertion caused by the overlarge size of the through hole are prevented, and the welding safety of the tab and the electrode terminal is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and particularly relates to a secondary battery, a battery pack and a power utilization device. BACKGROUND

[0002] A power battery is an energy supply device of an electric vehicle and is one of important components of the electric vehicle. A typical power battery comprises a top cover assembly for realizing conduction between an electrode assembly and an external power utilization device. The tab of the electrode assembly needs to be bent and welded to a transition piece, and then the transition piece is electrically connected to a pole. The tab bending occupies a large amount of internal space of the battery, resulting in low space utilization and reduced energy density of the battery. CONTENT OF THE UTILITY MODEL

[0003] The application embodiments provide a secondary battery, aim to solve the problem that the existing tab bending occupies a large amount of internal space of the battery, resulting in low space utilization and reduced energy density of the battery; another object of the application embodiments is to provide a battery pack; and still another object of the application embodiments is to provide a power utilization device.

[0004] TECHNICAL SCHEME: The secondary battery provided by the application embodiments has a first direction and comprises:

[0005] A shell having a receiving cavity;

[0006] An electrode assembly arranged in the receiving cavity, the electrode assembly comprising a battery cell and a tab, and the tab being connected to the battery cell;

[0007] A top cover assembly connected to the shell and covering the receiving cavity, the top cover assembly comprising an electrode terminal, and the electrode terminal comprising:

[0008] A body having a through hole, the through hole penetrating through the body along the first direction, and the tab being arranged in the through hole;

[0009] A clamping portion connected to the body and abutting against the tab.

[0010] In some embodiments,

[0011] The secondary battery has a second direction and a third direction intersecting with the first direction;

[0012] The through hole is a rectangular hole and extends along the second direction, and at least part of the clamping portion is arranged in the through hole;

[0013] The through hole has a first sidewall in the third direction, one end of the clamping portion is connected to the first sidewall, and an orthographic projection of the clamping portion on the body in the first direction is located in the through hole. The end of the clamping portion away from the first sidewall can move in a direction close to or away from the tab.

[0014] In some embodiments, the clamping portion includes:

[0015] a first bending section connected to the first sidewall;

[0016] a first clamping section connected to a side of the first bending section away from the first sidewall, and abutting against the tab.

[0017] In some embodiments, the clamping portion includes:

[0018] a second bending section connected to the first sidewall;

[0019] a third bending section connected to a side of the second bending section away from the first sidewall;

[0020] a second clamping section connected to a side of the third bending section away from the second bending section, and abutting against the tab.

[0021] In some embodiments, the clamping portion includes:

[0022] a resilient member, one end of the resilient member being connected to the first sidewall;

[0023] a first clamping member connected to an end of the resilient member away from the first sidewall, and connected to the tab.

[0024] In some embodiments, the clamping portion includes a plurality of the resilient members, the plurality of the resilient members being spaced apart in the second direction, one end of each of the plurality of the resilient members close to the first sidewall being connected to the first sidewall, and an end of each of the plurality of the resilient members away from the first sidewall being connected to the first clamping member.

[0025] In some embodiments, the through hole has a second sidewall opposite to the first sidewall in the third direction, and the electrode terminal includes a plurality of the clamping portions, the plurality of the clamping portions including a first clamping portion and a second clamping portion opposite to each other in the third direction, the first clamping portion being connected to the first sidewall, and the second clamping portion being connected to the second sidewall.

[0026] In some embodiments, the secondary battery has a second direction and a third direction intersecting with the first direction, and the clamping portion includes:

[0027] A slider is embedded in the through hole and can slide along the third direction;

[0028] A second clamping member is arranged on the side of the through hole away from the battery cell and connected with the slider; the orthographic projection of the second clamping member on the body along the first direction is partially located in the through hole and covers the slider, and the other part is located on the side of the body away from the battery cell; the two ends of the second clamping member along the second direction are connected with the body, and one side of the second clamping member along the third direction is connected with the tab.

[0029] Correspondingly, the battery pack described in the embodiments of the present application comprises the secondary battery described in any one of the preceding embodiments.

[0030] Correspondingly, the power device described in the embodiments of the present application comprises the secondary battery described in any one of the preceding embodiments, or the battery pack described in the preceding embodiments.

[0031] Advantages: Compared with the prior art, the secondary battery of the embodiments of the present application has a first direction, comprising a shell, an electrode assembly and a top cover assembly, the shell has a receiving cavity, the electrode assembly is arranged in the receiving cavity, the electrode assembly comprises a battery cell and a tab, the tab is connected with the battery cell; the top cover assembly comprises an electrode terminal, the electrode terminal comprises a body and a clamping part, the body has a through hole, the through hole penetrates the body along the first direction, the tab is embedded in the through hole; the clamping part is connected with the body and covers part of the through hole, and the clamping part abuts against the tab. The present application realizes the direct embedding of the tab in the through hole and the connection of the tab with the electrode terminal by arranging the through hole in the electrode terminal, which eliminates the design of the adapter piece, effectively reduces the space occupied by the connection of the tab with the electrode terminal in the height of the battery, and is beneficial to improving the volume energy density of the secondary battery. At the same time, the present application can clamp and fix the tab after the tab is embedded in the through hole by arranging the clamping part in the electrode terminal, so as to facilitate the welding connection of the tab with the electrode terminal, prevent the tab from loosening and the tab from being inserted due to the oversize of the through hole, and improve the safety of the welding of the tab with the electrode terminal.

[0032] Compared with the prior art, the battery pack of the embodiments of the present application comprises the secondary battery described in any one of the preceding embodiments. It can be understood that the battery pack of the present application comprises all the technical features and technical effects of the preceding secondary battery, which will not be described here.

[0033] Compared with the prior art, the power device of the embodiments of the present application comprises the secondary battery described in any one of the preceding embodiments, or the battery pack described in the preceding embodiments. It can be understood that the power device of the present application comprises all the technical features and technical effects of the preceding secondary battery or battery pack, which will not be described here. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments 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 any creative effort based on these drawings.

[0035] Figure 1 is a schematic diagram of the overall structure of a secondary battery according to an embodiment of the present application;

[0036] Figure 2 is an exploded view of a secondary battery according to an embodiment of the present application;

[0037] Figure 3 is Figure 1 is a sectional view along the A-A section line in FIG. 1;

[0038] Figure 4 is Figure 1 is a schematic diagram of the structure of the electrode terminal and the tab in a state of being not connected in FIG. 1;

[0039] Figure 5 is an exploded view of a top cover assembly of a secondary battery according to an embodiment of the present application;

[0040] Figure 6 is a schematic diagram of the overall structure of an electrode terminal in a flattened state of a clamping portion according to an embodiment of the present application;

[0041] Figure 7 is Figure 6 is a sectional view along the B-B section line in FIG. 1;

[0042] Figure 8 is a schematic diagram of the overall structure of an electrode terminal in a bent state of a clamping portion in a direction away from the battery cell according to an embodiment of the present application;

[0043] Figure 9 is Figure 8 is a sectional view along the C-C section line in FIG. 1;

[0044] Figure 10 is Figure 9 is an enlarged view of the A portion in FIG. 1;

[0045] Figure 11 is a schematic diagram of the overall structure of an electrode terminal in a wavy bent state of a clamping portion according to an embodiment of the present application;

[0046] Figure 12 is Figure 11 is a sectional view along the D-D section line in FIG. 1;

[0047] Figure 13 is Figure 12 is an enlarged view of the B portion in FIG. 1;

[0048] Figure 14 is a whole structure schematic diagram of an electrode terminal with a clamping part combined by an elastic member and a first clamping member according to an embodiment of the present application;

[0049] Figure 15 is Figure 14 is a sectional view of E-E section line in FIG. 1;

[0050] Figure 16 is a whole structure schematic diagram of an electrode terminal with a slidable clamping part according to an embodiment of the present application;

[0051] Figure 17 is Figure 16 is a sectional view of F-F section line in FIG. 2;

[0052] Figure 18 is Figure 16 is a sectional view of G-G section line in FIG. 3.

[0053] Marker 100, housing; 110, accommodating cavity; 200, electrode assembly; 210, battery cell; 220, tab; 300, top cover assembly; 310, electrode terminal; 311, body; 312, through hole; 3121, first side wall; 3122, second side wall; 313, clamping part; 3131, elastic member; 3132, first clamping member; 3133, sliding block; 3134, second clamping member; 3135, first bending section; 3136, first clamping section; 3137, second bending section; 3138, third bending section; 3139, second clamping section; 314, first clamping part; 315, second clamping part; Z, first direction; Y, second direction; X, third direction. DETAILED DESCRIPTION

[0054] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person skilled in the art without creative labor fall within the scope of protection of the present application.

[0055] In the description of the present application, it needs to be understood that the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, at least one of which can be one, two or more, unless otherwise explicitly specified. In the description of the present application, "vertical" means completely vertical at 90° or almost completely vertical, for example, within an angle range of 80°-100°, it is considered as vertical, similarly, "parallel" means completely parallel or almost completely parallel, for example, within a range of 10° of complete parallel, it is considered as parallel.

[0056] It should be further noted that in the drawings of the present application, the arrow marked Z indicates the first direction Z, the arrow marked Y indicates the second direction Y, and the arrow marked X indicates the third direction X. The first direction Z, the second direction Y and the third direction X are introduced to facilitate the description of the structural positional relationship of the secondary battery, and to facilitate understanding of the structure. In the embodiments of the present application, the first direction Z is the height direction of the secondary battery, the second direction Y is the length direction of the secondary battery, and the third direction X is the width direction of the secondary battery; and the first direction Z, the second direction Y and the third direction X intersect with each other, and further, the first direction Z, the second direction Y and the third direction X are perpendicular to each other.

[0057] The secondary battery as an energy supply device of an electric vehicle is one of the important components of the electric vehicle. A typical secondary battery includes a top cover assembly 300, a shell 100 and an electrode assembly 200. The top cover assembly 300 is used to form a cavity for placing the electrode assembly 200 together with the shell 100, and also used to realize the conduction of the electrode assembly 200 and an external electrical device. Usually, the tab 220 of the electrode assembly 200 needs to be welded and bent after welding with a transition sheet, and the transition sheet is welded with the electrode terminal 310 on the top cover assembly 300 to realize the conduction of the electrode terminal 310 and the external electrical device. The bending of the transition sheet and the tab 220 in the shell 100 occupies a large internal space of the secondary battery, affecting the energy density of the secondary battery.

[0058] Therefore, the embodiments of the present application provide a secondary battery, a battery pack and an electrical device, which aim to solve the above problems.

[0059] Please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 , a secondary battery has a first direction Z, comprising a shell 100, electrode assembly 200 and top cover assembly 300, the shell 100 has a receiving cavity 110, the electrode assembly 200 is arranged in the receiving cavity 110, the electrode assembly 200 includes a battery cell 210 and a tab 220, the tab 220 is connected with the battery cell 210; the top cover assembly 300 is connected with the shell 100, and covers the receiving cavity 110, the top cover assembly 300 includes an electrode terminal 310, the electrode terminal 310 includes a body 311 and a clamping part 313, the body 311 has a through hole 312, the through hole 312 penetrates the body 311 along the first direction Z, the tab 220 is arranged in the through hole 312; the clamping part 313 is connected with the body 311, and covers part of the through hole 312, the clamping part 313 is connected with the tab 220.

[0060] The application realizes that the tab 220 is directly arranged in the through hole 312 and connected with the electrode terminal 310 by arranging the through hole 312 in the electrode terminal 310, the adapter piece design is saved, the space occupied by the connection between the tab 220 and the electrode terminal 310 in the height of the battery can be effectively reduced, and the volume energy density of the secondary battery is improved. At the same time, the application can clamp and fix the tab 220 after the tab 220 is arranged in the through hole 312 by arranging the clamping part 313 in the electrode terminal 310, so as to facilitate the welding connection between the tab 220 and the electrode terminal 310, prevent the tab 220 from being loose or even inserted in the tab 220 due to the oversize of the through hole 312, and improve the safety of the welding between the tab 220 and the electrode terminal 310.

[0061] Specifically, the secondary battery of the embodiment of the application can be a square cell, and the tab 220 of the electrode assembly 200 can be a positive tab 220 or a negative tab 220 according to the connected electrode plate, wherein the tab 220 can be multiple, and the multiple tabs 220 are gathered together to be connected with an electrode terminal 310. Wherein, the electrode terminal 310 is provided with a through hole 312 penetrating through the body 311 along the first direction Z, and the through hole 312 is used to accommodate the gathered tabs 220, in order to facilitate the assembly of the secondary battery, the hole diameter of the through hole 312 needs to be greater than the sum of the size of the gathered tabs 220, so as to realize the smooth setting of the tabs 220 in the through hole 312, based on this, the clamping part 313 is arranged to clamp and fix the tabs 220 after the tabs 220 are set in the through hole 312, at this time, the gathered tabs 220 can be avoided to be loose, which is convenient for the subsequent welding connection of the tabs 220 and the electrode terminal 310, also reduces the possibility of internal insertion short circuit of the tabs 220, and improves the safety of the secondary battery. In addition, the tabs 220 are directly set in the through hole 312, which can reduce the height of the tabs 220 while reducing the size of the secondary battery along the first direction Z occupied by the tabs 220, at this time, the possibility of internal insertion short circuit of the tabs 220 can be further reduced.

[0062] It should be noted that the clamping part 313 of the embodiment of the application can be connected with the tabs 220 and the body 311 at the same time, realizing the fixation of the tabs 220 and the conductive connection between the tabs 220 and the electrode terminal 310. The clamping part 313 can have a certain deformation ability, so as to realize the adjustable shielding size of the clamping part 313 to the through hole 312, which is equivalent to realizing the adjustable size of the opening of the through hole 312, facilitating the insertion and fixation of the tabs 220. The clamping part 313 can also be separated from the body 311, and after the tabs 220 are inserted into the through hole 312, the clamping part 313 is installed to fix the tabs 220, which will be introduced in the subsequent embodiments.

[0063] Please refer to 6- Figure 17 In some embodiments, the secondary battery has a second direction Y and a third direction X intersecting with the first direction Z; the through hole 312 is a rectangular hole and extends along the second direction Y, and at least part of the clamping part 313 is arranged in the through hole 312; the through hole 312 has a first side wall 3121 in the third direction X, and the first side wall 3121 is arranged on one side of the through hole 312 along the third direction X; one end of the clamping part 313 is connected to the first side wall 3121, the orthographic projection of the clamping part 313 on the body 311 along the first direction Z is located in the through hole 312, and the end of the clamping part 313 away from the first side wall 3121 can move along the direction close to or away from the tabs 220.

[0064] In the embodiment of the present application, the rectangular through hole 312 is more suitable for the shape of the tab 220 after being folded, which facilitates the tab 220 to smoothly pass into the through hole 312, avoids collision and extrusion between the corners of the tab 220 and the hole wall of the through hole 312, and thus reduces the possibility of tab 220 folding. By setting the first side wall 3121 surrounding the through hole 312, and one end of the clamping portion 313 being fixedly connected to the first side wall 3121, the first side wall 3121 is used to support and fix the clamping portion 313. The orthographic projection of the clamping portion 313 on the body 311 along the first direction Z is located in the through hole 312, at this time, the clamping portion 313 is located in the through hole 312 and partially blocks the through hole 312, and the end of the clamping portion 313 away from the first side wall 3121 can move along the direction of approaching or moving away from the tab 220, so as to adjust the shielding range of the clamping portion 313 to the through hole 312, thereby facilitating the tab 220 to smoothly pass into the through hole 312 when the tab 220 is assembled with the electrode terminal 310, and after the tab 220 passes into the through hole 312, the end of the clamping portion 313 away from the first side wall 3121 is adjusted to approach the tab 220 and finally clamps the tab 220, and through the cooperation of the clamping portion 313 and the body 311, the fixation of the tab 220 is realized, so as to facilitate the subsequent welding connection of the tab 220 and the electrode terminal 310.

[0065] It should be noted that when the initial tab 220 is not assembled into the through hole 312, the size of the through hole 312 opening blocked by the clamping portion 313 along the third direction X is smaller than the size of the tab 220 along the third direction X, at this time, it is convenient to realize that after the tab 220 is assembled into the through hole 312, the clamping portion 313 can smoothly contact and clamp the tab 220.

[0066] Please refer to Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 In some embodiments, the clamping portion 313 includes a first bending segment 3135 and a first clamping segment 3136, the first bending segment 3135 is connected with the first side wall 3121, and the first clamping segment 3136 is connected to one side of the first bending segment 3135 away from the first side wall 3121, and the first clamping segment 3136 abuts against the tab 220.

[0067] In this embodiment, when the electrode terminal 310 is not connected to the tab 220, the first bending segment 3135 is bent and bends toward the through hole 312 away from the cell 210. At this time, it is convenient for the tab 220 to pass into the through hole 312. At the same time, the first bending segment 3135 can drive the first clamping segment 3136 to bend along the first direction Z toward the direction closer to the cell 210. When finally assembled into a secondary battery, the first clamping segment 3136 abuts against the tab 220 and is welded together.

[0068] In this embodiment, the clamping part 313 can be bent toward the direction of approaching or away from the battery cell 210. During the process of assembling the tab 220 into the through hole 312, the clamping part 313 can adjust the blocking range of the opening of the through hole 312, so that the tab 220 can be smoothly inserted into the through hole 312 and the tab 220 can be easily fixed.

[0069] It should be noted that, in this embodiment, the clamping part 313 can be bent away from the battery cell 210 first, such as... Figure 8 and Figure 9 As shown, the clamping part 313 is tilted upwards at this time, reducing the obstruction of the through hole 312 in the first direction Z, so that the electrode tab 220 can be smoothly inserted into the through hole 312. Then, the clamping part 313 is bent towards the direction closer to the cell 210 along the first direction Z. At this time, the end of the clamping part 313 away from the first side wall 3121 gradually approaches the electrode tab 220 and finally contacts or abuts against the electrode tab 220, thereby clamping the electrode tab 220, which facilitates the subsequent welding connection between the electrode tab 220 and the electrode terminal 310.

[0070] Specifically, the clamping part 313 can be formed by directly cutting the body 311 into an "I" shape, as shown in the example below. Figure 6 and Figure 7 As shown, at this time, a through hole 312 and two symmetrically arranged clamping parts 313 can be directly formed. The two clamping parts 313 are located inside the through hole 312, and the clamping parts 313 can be bent towards or away from the battery cell 210 along the first direction Z. Of course, it can also be formed by directly cutting the body 311 into a "C" shape (not shown in the figure). In this case, a through hole 312 and a clamping part 313 can be directly formed. One clamping part 313 is located inside the through hole 312 and is connected to the first side wall 3121 of the through hole 312, while the rest is suspended, which facilitates the bending and deformation of the clamping part 313.

[0071] It should be further noted that further, the clamping portion 313 can be integrally connected with the body 311, at this time, the stability of the connection between the clamping portion 313 and the body 311 can be maintained when the clamping portion 313 is bent in the first direction Z. At the same time, the clamping portion 313 can cover the through hole 312 in a large area, so as to facilitate the welding connection between the electrode terminal 310 and the tab 220 by directly welding the clamping portion 313, the tab 220 and the body 311, and facilitate the sealing of the through hole 312 and maintain the structural stability.

[0072] For reference, please see Figures 11-13 In some embodiments, the clamping portion 313 includes a second bending section 3137, a third bending section 3138 and a second clamping section 3139, the second bending section 3137 is connected with the first side wall 3121, the third bending section 3138 is connected to one side of the second bending section 3137 away from the first side wall 3121, and the second clamping section 3139 is connected to one side of the third bending section 3138 away from the second bending section 3137, and the second clamping section 3139 abuts against the tab 220.

[0073] In the embodiments of the present application, one end of the second bending section 3137 away from the side wall of the through hole 312 extends obliquely in the first direction Z towards the direction away from the battery cell 210, one end of the third bending section 3138 away from the second bending section 3137 extends obliquely towards the direction close to the battery cell 210, there can be an included angle between the second bending section 3137 and the side wall of the through hole 312, there can be an included angle between the second bending section 3137 and the third bending section, and there is an included angle between the third bending section 3138 and the second clamping section 3139. In this way, the second bending section 3137, the third bending section 3138 and the second clamping section 3139 can be folded and compressed or stretched in the third direction X. When the tab 220 is inserted into the through hole 312 and the clamping portion 313 clamps the tab 220, the second bending section 3137, the third bending section 3138 and the second clamping section 3139 are stretched in the third direction X, finally clamping the tab 220 and connecting the tab 220 with the electrode terminal 310 (welding connection of the clamping portion 313 and / or the body 311). This structure can realize the smooth insertion of the tab 220 into the through hole 312 for folding and clamping and fixing by the clamping portion 313, which is beneficial to the welding connection between the tab 220 and the electrode terminal 310.

[0074] In the embodiments of the present application, the clamping portion 313 can be a wave shape repeatedly folded in the third direction X. By compressing or stretching the clamping portion 313, the clamping portion 313 can be stretched or contracted in the third direction X, so as to adjust the shielding range of the clamping portion 313 to the through hole 312 in the third direction X, which is convenient for the tab 220 to be inserted into the through hole 312 and clamped.

[0075] Specifically, in the embodiment of the present application, the clamping portion 313 is repeatedly folded to form a wavy structure, at this time, the clamping portion 313 can have a certain elasticity, so that the clamping portion 313 can be stretched and contracted along the third direction X, thereby adjusting the size of the clamping portion 313 along the third direction X, and further adjusting the shielding range of the clamping portion 313 along the third direction X to the opening of the through hole 312. In the specific assembly process of the secondary battery, before the tab 220 is assembled with the electrode terminal 310, the clamping portion 313 is first compressed and folded along the third direction X towards the first side wall 3121, so that the opening area of the through hole 312 is increased, and after the tab 220 is assembled into the through hole 312, the clamping portion 313 is flattened, so that the clamping portion 313 is extended along the third direction X and gradually approaches the tab 220, until the clamping portion 313 contacts and clamps the tab 220, at this time, the welding connection of the tab 220 and the electrode terminal 310 can be carried out.

[0076] It should be noted that in the embodiment, the extension of the clamping portion 313 along the third direction X can be achieved by extruding the clamping portion 313 along the first direction Z to stretch and flatten it along the third direction X, or the clamping portion 313 can be pushed away from one end of the first side wall 3121 to move towards the tab 220, so that the clamping portion 313 is flattened as a whole.

[0077] As shown in Figure 14 and Figure 15 In some embodiments, the clamping portion 313 includes an elastic member 3131 and a first clamping member 3132, one end of the elastic member 3131 is connected with the first side wall 3121, and the first clamping member 3132 is connected to the end of the elastic member 3131 away from the first side wall 3121, and the first clamping member 3132 is connected with the tab 220.

[0078] In the embodiment of the present application, by setting the clamping portion 313 to include the elastic member 3131 and the first clamping member 3132, at this time, by using the elastic stretching and contracting performance of the elastic member 3131 along the third direction X, the position of the first clamping member 3132 along the third direction X can be adjusted, so that the shielding range of the clamping portion 313 along the third direction X to the through hole 312 can be adjusted, and the elastic member 3131 can drive the first clamping member 3132 to reset, so that the automatic clamping of the tab 220 can be realized after the tab 220 is inserted into the through hole 312, which is beneficial to the subsequent welding connection of the tab 220 and the electrode terminal 310, and reduces the resetting step of the clamping portion 313.

[0079] Specifically, before the tab 220 is inserted into the through hole 312, the first clamping part 3132 is compressed towards the first side wall 3121, so that the opening size of the through hole 312 along the third direction X is increased, the tab 220 is facilitated to be inserted into the through hole 312, then the first clamping part 3132 is released, and the first clamping part 3132 is moved towards the tab 220 under the self-resetting action of the elastic part 3131, and finally clamps the tab 220, thereby facilitating the welding connection between the tab 220 and the electrode terminal 310.

[0080] As shown in Figure 14 some embodiments, the clamping part 313 includes a plurality of elastic parts 3131, the plurality of elastic parts 3131 are arranged at intervals along the second direction Y, one end of each of the plurality of elastic parts 3131 close to the first side wall 3121 is connected with the first side wall 3121, and one end of each of the plurality of elastic parts 3131 away from the first side wall 3121 is connected with the first clamping part 3132.

[0081] In the embodiments of the present application, by arranging the plurality of elastic parts 3131 at intervals along the second direction Y, the multi-point support of the first clamping part 3132 can be achieved, the stress on the first clamping part 3132 is more uniform, and meanwhile, the clamping force of the clamping part 313 as a whole is better.

[0082] Please refer to Figures 11-15 In some embodiments, the body 311 includes a second side wall 3122, the second side wall 3122 is arranged opposite to the first side wall 3121 along the third direction X, the second side wall 3122 is used for surrounding the through hole 312, and the electrode terminal 310 includes a plurality of clamping parts 313, the plurality of clamping parts 313 includes a first clamping part 314 and a second clamping part 315 arranged opposite along the third direction X, the first clamping part 314 is connected with the first side wall 3121, and the second clamping part 315 is connected with the second side wall 3122.

[0083] In the embodiments of the present application, by arranging the first side wall 3121 and the second side wall 3122 opposite along the third direction X, and arranging the first clamping part 314 and the second clamping part 315 opposite along the third direction X, the central fixation of the tab 220 can be achieved, meanwhile, by clamping the tab 220 in two directions along the third direction X by the two clamping parts 313, the clamping force on the tab 220 can be improved, which is more conducive to the positioning and fixation of the tab 220, thereby facilitating the welding connection between the tab 220 and the electrode terminal 310.

[0084] It should be noted that the clamping portion 313 has a conductive capability, the clamping portion 313 is in conductive connection with the tab 220, based on the clamping portion 313 being fixedly connected with the body 311, further, the clamping portion 313 can be in conductive connection with the body 311, and then even if the tab 220 is not directly connected with the body 311, the tab 220 can also be in conductive connection with the body 311 through the clamping portion 313, so as to realize the conductive connection between the tab 220 and the electrode terminal 310.

[0085] Please refer to Figure 16 , Figure 17 and Figure 18 In some embodiments, the secondary battery has a second direction Y and a third direction X intersecting the first direction Z, the clamping portion 313 includes a sliding block 3133 and a second clamping piece 3134, the sliding block 3133 is embedded in the through hole 312 and can slide along the third direction X; the second clamping piece 3134 is arranged on the side of the through hole 312 away from the battery cell 210 and is connected with the sliding block 3133; the normal projection of the second clamping piece 3134 on the body 311 along the first direction Z is partially located in the through hole 312 and covers the sliding block 3133, and the other part is located on the side of the body 311 away from the battery cell 210; the second clamping piece 3134 can slide along the third direction X, both ends of the second clamping piece 3134 along the second direction Y are connected with the body 311, and one side of the second clamping piece 3134 along the third direction X is connected with the tab 220.

[0086] In the embodiments of the present application, the clamping portion 313 can be detachably connected with the body 311, after the tab 220 is arranged in the through hole 312, the position of the entire clamping portion 313 in the through hole 312 is adjusted, the clamping portion 313 is brought into contact with the tab 220, and the tab 220 is abutted between the clamping portion 313 and the side wall of the through hole 312, so as to clamp and fix the tab 220. Such a structure can more flexibly adjust the position of the clamping portion 313 and the distance between the clamping portion 313 and the side wall of the through hole 312, so as to realize the effective contact and fixed connection of the tab 220 with the clamping portion 313 and the body 311.

[0087] Specifically, in the embodiments of the present application, the clamping portion 313 can be taken out from the through hole 312 as a whole, at this time, the range of the through hole 312 opening is the largest, and the opening size along the third direction X is also the largest. The tab 220 can be directly inserted into the through hole 312, then the clamping portion 313 is placed on one side of the tab 220, the sliding block 3133 is embedded in the through hole 312, and then the clamping portion 313 is pushed and slid as a whole along the third direction X to the tab 220 until the clamping portion 313 is slid to abut against the tab 220 and the tab 220 abuts against the side wall of the through hole 312, at this time, the clamping portion 313 cooperates with the side wall of the through hole 312 to clamp the tab 220.

[0088] It should be noted that the sliding block 3133 is embedded in the through hole 312 and there is a friction force between the sliding block 3133 and the side wall of the through hole 312. After the clamping part 313 clamps the tab 220, the clamping part 313 as a whole will not move in the direction away from the tab 220 under the action of the friction force, so as to maintain the effective clamping and fixing of the tab 220.

[0089] It should be further noted that in the embodiment of the present application, the sliding block 3133 is embedded in the through hole 312, the second clamping part 3134 is arranged outside the through hole 312, and part of the second clamping part 3134 is located on the side of the body 311 away from the battery cell 210 in the first direction Z. In this way, the body 311 is used to limit the second clamping part 3134 in the first direction Z, so as to avoid that the clamping part 313 as a whole falls into the through hole 312 due to improper force during embedding. At the same time, the second clamping part 3134 is located outside the through hole 312, which is more conducive to pushing the second clamping part 3134 to drive the sliding block 3133 to slide in the third direction X. At the same time, part of the second clamping part 3134 is located on the side of the body 311 away from the battery cell 210, so that the body 311 and the second clamping part 3134 can be connected by welding, so as to realize the final conductive connection and fixing of the clamping part 313 and the body 311. At the same time, the tab 220, the second clamping part 3134 and the hole wall of the through hole 312 are welded, so as to realize the welding connection of the tab 220, the clamping part 313 and the body 311.

[0090] Correspondingly, the battery pack of the embodiment of the present application comprises the secondary battery of any one of the preceding embodiments.

[0091] It can be understood that the battery pack of the present application comprises all the technical features and technical effects of the aforementioned secondary battery, which will not be repeated here.

[0092] Correspondingly, the battery pack of the embodiment of the present application comprises the secondary battery of any one of the preceding embodiments.

[0093] It can be understood that the battery pack of the present application comprises all the technical features and technical effects of the aforementioned secondary battery, which will not be repeated here.

[0094] Of course, the electric device referred to in the present application can be an application device such as a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, and an electric tool. The vehicle can be a new energy vehicle, which can be a pure electric vehicle, a hybrid electric vehicle, or a range extended electric vehicle. The spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, such as a game console, an electric vehicle toy, an electric ship toy, and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool, and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator, and an electric planer, etc. The embodiments of the present application do not specially limit the above electric device.

[0095] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0096] The above describes in detail a secondary battery, a battery pack, and an electric device provided by the embodiments of the present application, and the principles and implementation manners of the present application are described by using specific examples. The above description of the embodiments is only used to help understand the technical solutions and the core ideas of the present application; a person of ordinary skill in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A secondary battery characterized by comprising: Having a first direction, comprising: a housing having a receiving cavity; an electrode assembly disposed in the receiving cavity, the electrode assembly comprising an electrode core and a tab connected to the electrode core; a top cover assembly connected to the housing and covering the receiving cavity, the top cover assembly comprising an electrode terminal, the electrode terminal comprising: a body having a through hole extending through the body along the first direction, the tab being disposed in the through hole; a clamping portion connected to the body and abutting against the tab.

2. The secondary battery according to claim 1, wherein: the secondary battery has a second direction and a third direction intersecting the first direction; the through hole is a rectangular hole extending along the second direction, and at least a portion of the clamping portion is disposed in the through hole; the through hole has a first side wall in the third direction, one end of the clamping portion is connected to the first side wall, and a normal projection of the clamping portion on the body along the first direction is located in the through hole, and the end of the clamping portion away from the first side wall is movable in a direction approaching or away from the tab.

3. The secondary battery according to claim 2, characterized by the clamping portion comprises: a first bending section connected to the first side wall; a first clamping section connected to a side of the first bending section away from the first side wall, the first clamping section abutting against the tab.

4. The secondary battery according to claim 2, characterized by the clamping portion comprises: a second bending section connected to the first side wall; a third bending section connected to a side of the second bending section away from the first side wall; a second clamping section connected to a side of the third bending section away from the second bending section, the second clamping section abutting against the tab.

5. The secondary battery according to claim 4, characterized by the clamping portion comprises: a resilient member, one end of the resilient member being connected to the first side wall; a first clamping member connected to an end of the resilient member away from the first side wall, the first clamping member abutting against the tab.

6. The secondary battery according to claim 5, characterized by the clamping portion comprises a plurality of the resilient members, the plurality of the resilient members being spaced apart along the second direction, and the ends of the plurality of the resilient members close to the first side wall are all connected to the first side wall, and the ends of the plurality of the resilient members away from the first side wall are all connected to the first clamping member.

7. The secondary battery according to claim 2, characterized by the through hole has a second side wall opposite to the first side wall along the third direction, and the clamping portion comprises a first clamping portion and a second clamping portion opposite to each other along the third direction, the first clamping portion being connected to the first side wall, and the second clamping portion being connected to the second side wall.

8. The secondary battery according to claim 1, characterized by the secondary battery has a second direction and a third direction intersecting the first direction, and the clamping portion comprises: a slider embedded in the through hole and slidable along the third direction; A second clamping member is arranged on the side of the through hole away from the battery cell and connected with the sliding block; the orthographic projection of the second clamping member on the body along the first direction is partially located in the through hole and covers the sliding block, and the other part is located on the side of the body away from the battery cell; the two ends of the second clamping member along the second direction are connected with the body, and one side of the second clamping member along the third direction is connected with the tab.

9. A battery pack, characterized by, A secondary battery comprising the secondary battery according to any one of claims 1 to 8.

10. An electrical device, characterized by A battery pack comprising the secondary battery according to any one of claims 1 to 8, or the battery pack according to claim 9.

Images