CN221239682U - Cylindrical battery, battery pack and electronic equipment - Google Patents

Abstract

The utility model provides a cylindrical battery, a battery pack and electronic equipment, wherein the cylindrical battery comprises a shell, an electrode assembly, an end cover and a current collecting member, the shell comprises a surrounding side wall, one end of the side wall is provided with an opening, and one end of the shell, which is close to the opening, comprises a groove recessed towards the interior of the shell; the electrode assembly is accommodated in the shell and comprises a tab facing the opening; the end cover is arranged on the opening in a sealing way; the current collecting component is arranged between the electrode assembly and the end cover, and comprises a plurality of tab connecting parts and a shell connecting part, wherein the tab connecting parts are fixedly connected with the tabs, the shell connecting part comprises a plurality of folded edges distributed along the circumferential direction of the cylindrical battery, and the folded edges are bent relative to the tab connecting parts and are fixedly connected with one side of the groove facing the electrode assembly; the current collecting component further comprises a plurality of transition connecting parts, the plurality of transition connecting parts are connected with the lug connecting parts and the folded edges, and the transition connecting parts comprise weak areas; the utility model can reduce the risk of failure of the electrical connection between the current collecting member and the electrode assembly.

Description

Cylindrical battery, battery pack and electronic equipment

Technical Field

The utility model relates to the field of batteries, in particular to a cylindrical battery, a battery pack and electronic equipment.

Background

The main stream packaging mode of the existing cylindrical battery is mechanical sealing, and the mechanical sealing has the advantages of mature process and equipment and quick production beat and is widely applied. In the mechanical sealing process, a circle of rolling groove which is sunken towards the inside of the shell is firstly rolled on the side wall of the shell, one side of the rolling groove, close to the electrode assembly, compresses the edge of the current collecting member, one side of the rolling groove, away from the electrode assembly, bears the end cover, and the end cover is compressed in a pier sealing mode; in order to improve the connection reliability of the current collecting member and the case, a flange is provided at the edge of the current collecting member, the flange is bent and formed together in the process of rolling the roll groove, and the stress generated when the flange at the edge of the current collecting member is bent causes the inside of the current collecting member to tilt, so that the welding part of the current collecting member and the tab is broken, thereby the risk of failure of the electrical connection of the electrode assembly occurs.

Disclosure of utility model

In view of the above shortcomings of the prior art, the present utility model provides a cylindrical battery, a battery pack and an electronic device to reduce the risk of failure of the electrical connection between a current collecting member and an electrode assembly.

To achieve the above and other objects, the present utility model provides a cylindrical battery including a case including a surrounding sidewall, one end of which is formed with an opening, an electrode assembly, an end cap, and a current collecting member, the end of the case adjacent to the opening including a recess recessed into the inside of the case; an electrode assembly accommodated in the case, the electrode assembly including a tab facing the opening; an end cover which is hermetically arranged at the opening; the current collecting component is arranged between the electrode assembly and the end cover, and comprises a plurality of tab connecting parts and a shell connecting part, wherein the tab connecting parts are fixedly connected with the tabs, the shell connecting part comprises a plurality of folded edges distributed along the circumferential direction of the cylindrical battery, and the folded edges are bent relative to the tab connecting parts and are fixedly connected with one side of the groove facing the electrode assembly; the current collecting component further comprises a plurality of transitional connecting parts, the plurality of transitional connecting parts are connected with the lug connecting parts and the folded edges, and the transitional connecting parts comprise weak areas.

In an example of the cylindrical battery of the present utility model, the current collecting member is provided with a central hole corresponding to the center of the electrode assembly, and the plurality of tab connection parts are radially distributed centering around the central hole, and one end of each tab connection part, which is far from the central hole, is connected with the transition connection part.

In an example of the cylindrical battery of the present utility model, the weak area is disposed at the junction of the transition connection portion and the tab connection portion, and the cross-sectional area of the weak area is smaller than the cross-sectional area of the tab connection portion.

In one example of a cylindrical battery of the present utility model, the weakened areas are provided as one or a combination of one or more of a thinned area, score, or aperture along the thickness of the current collecting member.

In an example of the cylindrical battery, a tab avoidance area is arranged at one end of the electrode assembly, which is close to the current collecting member, and extends from the edge of the electrode assembly to the center to form an annular space, and the orthographic projection of the tab avoidance area covers the orthographic projection of the transition connection part along the height direction of the cylindrical battery.

In an example of the cylindrical battery of the present utility model, the current collecting member further includes a plurality of pop-up structures distributed along a circumferential direction of the cylindrical battery, the pop-up structures being bent in a direction away from the electrode assembly and formed with an abutting portion abutting the end cap.

In an example of the cylindrical battery of the present utility model, the bouncing structure includes a first bending portion, a second bending portion and a third bending portion, the first bending portion is perpendicular to the tab connection portion within a certain error range, the error range is-10 ° to 10 °, the second bending portion and the first bending portion form an obtuse angle for bending, the third bending portion and the second bending portion form an obtuse angle for bending, and the third bending portion and a crease of the second bending portion form an abutting portion.

In an example of the cylindrical battery of the present utility model, the end cap is provided with a discharge area, the orthographic projection of the discharge area covers the orthographic projection of the tab connection portion in the height direction of the cylindrical battery, and the tab connection portion is folded to the outside of the discharge area along the edge of the discharge area when the discharge area is opened.

In an example of the cylindrical battery of the present utility model, the end cap is provided with a discharge region, and a position where the abutting portion abuts against the end cap is located inside or outside the discharge region.

In one example of a cylindrical battery of the present utility model, the width of the pop-up structure ranges from: 2-6 mm.

In an example of the cylindrical battery of the present utility model, the current collecting member further includes a plurality of reinforcing structures which are distributed between each two adjacent tab connection portions in the circumferential direction of the cylindrical battery and connect the side edges of each two adjacent tab connection portions at the near edges.

The utility model also provides a battery pack comprising the cylindrical battery of any one of the above.

The utility model also provides electronic equipment, which comprises the battery pack.

In the cylindrical battery, the current collecting member further comprises a plurality of transition connecting parts, each transition connecting part is connected with the lug connecting part and the folded edge, and the transition connecting parts comprise weak areas; when the folded edge of the current collecting member is bent, stress is generated, and the weak area of the transitional connecting part is deformed firstly under the action of the stress, so that the transmission of the stress to the middle part of the current collecting member is reduced, the possibility that the welding part of the current collecting member and the tab is broken due to the stress is reduced, and the risk of failure in the electric connection of the current collecting member and the electrode assembly is further reduced.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are necessary for the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model and that other embodiments may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view showing the overall structure of an embodiment of a cylindrical battery according to the present utility model;

FIG. 2 is an enlarged view of a portion of one embodiment of FIG. 1A;

FIG. 3 is a partial enlarged view at B in FIG. 2;

Fig. 4 is a bottom view of the first manifold member of fig. 2;

FIG. 5 is an enlarged view of a portion of another embodiment of FIG. 1A;

FIG. 6 is an enlarged view of a portion of FIG. 5 at C;

fig. 7 is a bottom view of the first manifold member of fig. 5;

FIG. 8 is an enlarged view of a portion of a further embodiment of FIG. 1A;

FIG. 9 is a partial enlarged view at D in FIG. 8;

Fig. 10 is a bottom view of the first manifold member of fig. 8;

fig. 11 is an exploded view of the end cap and the first current collecting member;

Fig. 12 is a schematic view of the first current collecting member of fig. 11 from another perspective;

FIG. 13 is an enlarged view of a portion of still another embodiment of FIG. 1A;

FIG. 14 is an enlarged view of a portion of FIG. 13 at E;

FIG. 15 is a schematic view of an embodiment of a battery pack according to the present utility model;

Fig. 16 is a schematic diagram of an electronic device according to an embodiment of the utility model.

Description of element reference numerals

1. An electronic device; 10. a battery pack; 11. a working section; 101. a case; 102. a case cover; 100. a cylindrical battery; 110. a housing; 111. an end wall; 112. a sidewall; 1121. a ring groove; 1122. a seal ring; 1123. a groove; 1124. a first sidewall; 1125. a second sidewall; 1126. flanging; 113. an opening; 120. an electrode assembly; 121. a second lug; 122. a first tab; 123. a tab avoidance region; 130. a first current collecting member; 131. a tab connection part; 132. a housing connection portion; 1321. folding edges; 133. a transitional connection part; 1331. a weakened area; 13311. a pier thinning area; 13312. scoring; 13313. opening holes; 134. a central bore; 135. a pop-up structure; 1351. an abutting portion; 1352. a first bending part; 1353. a second bending part; 1354. a third bending part; 136. a reinforcing structure; 140. a second current collecting member; 150. a pole; 160. an end cap; 161. a discharge zone; 162. a fracture; 1621. scoring the end cap; 163. a first side; 164. a second side; 165. and a third side.

Detailed Description

Other advantages and effects of the present utility model will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present utility model with reference to specific examples. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. It is also to be understood that the terminology used in the examples of the utility model is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the utility model. The test methods in the following examples, in which specific conditions are not noted, are generally conducted under conventional conditions or under conditions recommended by the respective manufacturers.

Where numerical ranges are provided in the examples, it is understood that unless otherwise stated herein, both endpoints of each numerical range and any number between the two endpoints are significant both in the numerical range. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs and to which this utility model belongs, and any method, apparatus, or material of the prior art similar or identical to the methods, apparatus, or materials of the embodiments of the utility model may be used to practice the utility model.

It should be understood that the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like are used in this specification for descriptive purposes only and not for purposes of limitation, and that the utility model may be practiced without materially departing from the novel teachings and without departing from the scope of the utility model.

Referring to fig. 1 to 16, the present utility model provides a cylindrical battery 100, and a battery pack 10 and an electronic device 1 including the cylindrical battery 100, wherein in the cylindrical battery 100, a current collecting member further includes a plurality of transition connection parts 133, each transition connection part 133 connects a tab connection part 131 and a flange 1321, and the transition connection part 133 includes a weak area 1331; to reduce the risk of failure of the electrical connection of the current collecting member to the electrode assembly 120.

Referring to fig. 1, the cylindrical battery 100 includes a case 110, an electrode assembly 120, a post 150, an end cap 160, and a current collecting member.

Referring to fig. 1, the housing 110 includes an end wall 111 and a side wall 112 surrounding the end wall 111, and the connection between the end wall 111 and the side wall 112 can be made in various ways, such as integrally formed by stamping, integrally cast molding, or separately welded, so long as a stable sealing and electrical connection relationship is achieved. The side wall 112 may be, but not limited to, a cylindrical or prismatic shape, or may be formed along any other closed-loop contour that can match the end wall 111, and in this embodiment, the outer edge of the end wall 111 is circular, the side wall 112 is formed in a cylindrical shape around the outer edge of the end wall 111, and a circular opening 113 is formed at an end of the side wall 112 facing away from the end wall 111. A housing 110 surrounded by the end wall 111 and the side wall 112 has a housing chamber formed therein for housing the electrode assembly 120, an electrolyte (not shown), and other necessary components of the battery. Specifically, the diameter of the case 110 may be sized according to the specific dimensions of the electrode assembly 120, such as 18mm, 21mm, 46mm, etc. The material of the housing 110 may be various, such as copper, iron, aluminum, steel, aluminum alloy, etc., and in order to prevent the housing 110 from rusting during long-term use, a layer of rust-preventing material such as metallic nickel, etc. may be plated on the surface of the housing 110.

Referring to fig. 1, an electrode assembly 120 is received in a case 110, and the electrode assembly 120 is a component of the cylindrical battery 100 in which electrochemical reactions occur. One or more electrode assemblies 120 may be contained within the case 110. The electrode assembly 120 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally provided between the positive electrode sheet and the negative electrode sheet. The positive electrode plate comprises a positive electrode current collector and a positive electrode active substance, and the positive electrode active substance is coated on the surface of the positive electrode current collector; the positive electrode current collector includes a coated region coated with an active material and an uncoated region uncoated with an active material, and the uncoated region is wound to form a positive electrode tab of the electrode assembly 120. The negative electrode plate comprises a negative electrode current collector and a negative electrode active substance, and the negative electrode active substance is coated on the surface of the negative electrode current collector; the negative electrode current collector includes a coated region coated with an active material and an uncoated region uncoated with the active material, and the uncoated region is wound to form a negative electrode tab of the electrode assembly 120. Taking the lithium ion cylindrical battery 100 as an example, the material of the positive electrode current collector may be aluminum, the positive electrode active material includes a positive electrode active material, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The material of the negative electrode current collector may be copper, the negative electrode active material includes a negative electrode active material, and the negative electrode active material may be carbon or silicon, etc. The separator may be made of PP (polypropylene) or PE (polyethylene). In order to protect and insulate the battery cell, the battery cell can be coated with an insulating film, and the insulating film can be synthesized by PP, PE, PET, PVC or other high polymer materials.

The electrode assembly 120 in the present utility model includes two tabs facing the end wall 111 and facing the opening 113, for convenience of distinction, the tab facing the opening 113 is named as a first tab 122, the tab facing the end wall 111 is named as a second tab 121, the second tab 121 may be a positive tab or a negative tab, the first tab 122 is opposite to the second tab 121 in electrical property, when the second tab 121 is a positive tab, the first tab 122 is a negative tab, when the second tab 121 is a negative tab, the first tab 122 is a positive tab, both tabs are connected with current collecting members, and for convenience of distinction, the tab is named as a first current collecting member 130 connected with the first tab 122, the tab 121 is named as a second current collecting member 140 connected with the second tab 121, the second tab 121 is electrically connected with the pole 150 through the second current collecting member 140, and the first current collecting member 130 is disposed at one end of the electrode assembly 120 facing the opening 113 and is welded with the first tab 122. In this embodiment, the second tab 121 is a positive tab, the electrode post 150 is electrically connected to the second tab 121 and is positively charged, the first tab 122 is a negative tab, and the opening 113 side of the housing 110 opposite to the end wall 111 is electrically connected to the first tab 122 and is negatively charged.

Referring to fig. 1, a pole 150 is mounted on an end wall 111 of a housing 110, and the pole 150 passes through the end wall 111 and is insulated from the end wall 111. The structure of the terminal 150 may be any suitable form that can be electrically connected to the second tab 121 of the electrode assembly 120 through the end wall 111, for example, a cross section may be circular, square, prismatic, or a profile that can achieve stable electrical conduction, and in this embodiment, the end wall 111 is provided with a terminal 150 mounting hole, and the terminal 150 is hermetically and insulatively inserted into the terminal 150 mounting hole. Such a case 110 structure can improve installation efficiency, and is more excellent in assemblability and sealability than the case 110 form having both ends open. One end of the electrode post 150 facing the electrode assembly 120 passes through the end wall 111 to be directly electrically connected with the second electrode tab 121 or is electrically connected through indirect transfer, in this embodiment, the electrode post 150 is electrically connected with the second electrode tab 121 through transfer of the second current collecting member 140, one end of the electrode post 150 facing the opening 113 is welded with the second current collecting member 140, and one side of the second current collecting member 140 facing away from the electrode post 150 is welded with the second electrode tab 121. One end of the post 150 facing away from the electrode assembly 120 is exposed to the outside of the case 110 to form a connection surface to which an external bus bar is connected.

Referring to fig. 1 to 3, 5 to 6 and 8 to 9, the end cap 160 is sealingly mounted to the opening 113; the outer edge of the end cap 160 corresponds in shape to the opening 113 and is connected to the side wall 112 to seal the opening 113. In a specific embodiment, a ring of recess 1123 recessed toward the interior of the case 110 is formed on the side wall 112 of the case 110 by rolling a region near the outer end, the recess 1123 includes a first side wall 1124 and a second side wall 1125, the first side wall 1124 is close to the electrode assembly 120 and can limit the axial displacement of the electrode assembly 120, the second side wall 1125 forms an annular step around the case 110 on the side facing away from the recess 1123, the end cap 160 is placed on the step, after which the edge of the opening 113 is formed into a ring groove 1121 by a upsetting process, one side surface of the ring groove 1121 is the second side wall 1125, the other side surface is a flange 1126, and the second side wall 1125 and the flange 1126 press-fix the proximal edge of the end cap 160, specifically, the surface of the end cap 160 mating with the ring groove 1121 is the first side surface 163 near the second side wall 1125, the second side 164 near the bottom of the ring groove 1121, and the third side surface 165 near the flange 1126. In this embodiment, a seal ring 1122 is disposed between the end cover 160 and the ring groove 1121, and the seal ring 1122 may be made of ethylene propylene diene monomer rubber, fluorosilicone rubber or fluororubber, but is not limited thereto, preferably, the seal ring 1122 is in a form of wrapping the first side 163, the second side 164 and the third side 165 of the end cover 160 to ensure a better sealing effect on the housing 110, and it is understood that in other embodiments, the end cover 160 may be directly welded to the opening 113 of the housing 110.

Referring to fig. 1 to 3, fig. 5 to 6 and fig. 8 to 9, in an example of the cylindrical battery 100 according to the present utility model, the first current collecting member 130 is disposed between the electrode assembly 120 and the end cap 160, the electrode assembly 120 is electrically connected to the end cap 160, specifically, the first current collecting member 130 includes a plurality of tab connection portions 131 and a housing connection portion 132, the tab connection portions 131 are fixedly connected to the first tab 122, the fixed connection manner includes, but not limited to, welding, penetration welding, laser welding, etc., the electrical connection manner of the first current collecting member 130 to the housing 110 includes direct fixed connection, and also includes that the first current collecting member 130 is electrically connected to the end cap 160 first, and then the end cap 160 is electrically connected to the housing 110, so as to realize the electrical connection between the housing 110 and the electrode assembly 120.

Further, considering that the stress generated when the flange 1321 on the case connecting portion 132 is bent may cause the inside of the current collecting member to tilt, resulting in the risk of failure of the electrical connection between the current collecting member and the tab, in order to solve this problem, in an example of the present utility model, the current collecting member further includes a plurality of transition connecting portions 133, the number of the transition connecting portions 133 is equal to the number of the flange 1321, each transition connecting portion 133 connects the tab connecting portion 131 and the flange 1321, the transition connecting portion 133 includes a weak area 1331, the position of the weak area 1331 is not limited, in this embodiment, the weak area 1331 is disposed at the junction between the transition connecting portion 133 and the tab connecting portion 131, when the flange 1321 of the current collecting member is bent, the weak area 1331 of the transition connecting portion 133 is deformed first under the stress, so as to reduce the transmission of the stress towards the middle of the current collecting member, and reduce the risk of failure of the electrical connection between the first current collecting member 130 and the electrode assembly 120 due to the stress.

Referring to fig. 4, 7, and 10 to 12, in an example of the cylindrical battery 100 according to the present utility model, in order to achieve better roundness of the first current collecting member 130, the first current collecting member 130 is provided with a center hole 134 corresponding to the center of the electrode assembly 120, and for reliability of welding the tab connection parts 131 and the first tab 122, the tab connection parts 131 are radially distributed centering around the center hole 134, and in this embodiment, the tab connection parts 131 are provided in four and uniformly distributed around the center hole 134 to form a cross-shaped welding area with the tab, which can increase the welding area between the first current collecting member 130 and the first tab 122. Preferably, the four folds 1321 and the four transitional connecting portions 133 are respectively arranged and correspond to the tab connecting portions 131, and the arrangement makes the housing 110 directly electrically connected with the first tab 122 at the shortest distance through the folds 1321 and the transitional connecting portions 133 and the tab connecting portions 131, so that the reliability of conduction is higher.

In order to reduce the transmission of stress generated by the flange 1321 during bending to the inside of the first current collecting member 130, in an example of the cylindrical battery 100 of the present utility model, referring to fig. 3 to 4, 6 to 7, and 9 to 11, a weak area 1331 is disposed at the interface between the transition connection portion 133 and the tab connection portion 131, and the cross-sectional area of the weak area 1331 is smaller than that of the tab connection portion 131. Specifically, the cross-sectional area of the weakened area 1331 refers to the area of the connection surface between the transition connection portion 133 and the tab connection portion 131, the cross-sectional area of the tab connection portion 131 refers to the cross-sectional area of other positions on the tab connection portion 131 parallel to the cross-sectional area of the weakened area 1331, so as to form a sudden reduction in the cross-sectional area in the weakened area 1331 to weaken the transmission of stress to the tab connection portion 131, it should be noted that the cross-sectional area of the transition connection portion 133 gradually decreases from the housing connection portion 132 to the extending direction of the tab connection portion 131, the gradually decreasing structure is not limited, alternatively, the shape of the transition connection portion 133 may be a trapezoid, a fan, a pear, or the like, and the transition connection portion 133 in this embodiment approximates a trapezoid structure, wherein the short side in the trapezoid structure is connected with the tab connection portion 131, that is the weakened area 1331 is located at the short side in the trapezoid structure, preferably, each corner of the transition connection portion 133 is provided with a rounded corner or a chamfer, so as to avoid the occurrence of a crack caused by stress concentration at the corner.

Further, in an example of the cylindrical battery 100 of the present utility model, the weakened area 1331 is configured to form a thinned area 13311 by thinning the junction between the transition connection portion 133 and the tab connection portion 131, and referring to fig. 2 to 4, the configuration is such that the transition connection portion 133 deforms or bends in the thinned area 13311 under the stress generated by bending the flange 1321, so as to weaken the influence of the stress on the tab connection portion 131; in another example of the cylindrical battery 100 according to the present utility model, the weakened area 1331 is provided as the notch 13312 at the junction between the transition connection portion 133 and the tab connection portion 131, referring to fig. 5 to 7, the thickness of the transition connection portion 133 at the position of the notch 13312 suddenly changes, and as such, the effect that the weakened area 1331 of the transition connection portion 133 is deformed first under the action of stress can be achieved; in still another example of the cylindrical battery 100 according to the present utility model, the weak area 1331 is provided with the openings 13313 at the boundary between the transition connection portion 133 and the tab connection portion 131, specifically, a plurality of sub-holes arranged at intervals, referring to fig. 8 to 10, the plurality of sub-holes make the structural strength of the connection portion weaker, and the transition connection portion 133 is deformed or bent at the connection portion under the stress generated by bending of the flange 1321.

In view of the fact that the deformation or bending direction of the transition connection portion 133 in the weak area 1331 is towards the electrode assembly 120, in order to avoid the interference between the transition connection portion 133 and the electrode assembly 120 and the internal short circuit caused by the insertion of the transition connection portion 133 into the electrode assembly 120, in an example of the cylindrical battery 100 according to the present utility model, referring to fig. 2 to 3, 5 to 6 and 8 to 9, an end of the electrode assembly 120, which is close to the current collecting member, is provided with the tab avoidance area 123, the tab avoidance area 123 may be implemented by reducing the number of stacked tabs at the location or cutting tabs at the location, so that in the height direction of the cylindrical battery 100, the tab height of the tab avoidance area 123 is lower than the tab height of the welding area, so that the tab avoidance area 123 extends from the edge of the electrode assembly 120 to the center to form an annular space, and further, in the height direction of the cylindrical battery 100, the front projection of the tab avoidance area 123 covers the front projection of the transition connection portion 133, so as to realize that the annular space can accommodate the deformation or bending of the transition connection portion 133, and the interference between the transition connection portion 133 and the electrode assembly 120 is avoided.

Referring to fig. 2, 4, 5, 7, 8 and 10 to 12, in an example of the cylindrical battery 100 according to the present utility model, the current collecting member further includes a plurality of pop-up structures 135, the plurality of pop-up structures 135 may be distributed along the circumferential direction of the cylindrical battery 100 and located between two tab connection portions 131 adjacent in the circumferential direction, and since four tab connection portions 131 are provided in the present embodiment, the number of the pop-up structures 135 is four, and the pop-up structures 135 may be integrally formed with the first current collecting member 130 or may be obtained by adding materials, and the shape thereof is not limited as long as the pop-up structures 135 have a contact portion 1351 that bends in a direction away from the electrode assembly 120 and may form a contact with the end cap 160, and the arrangement may enable the end cap 160 to be charged, so as to improve the electrochemical corrosion resistance of the end cap 160.

Preferably, in an example of the cylindrical battery 100 of the present utility model, referring to fig. 12 and 14, the pop-up structure 135 includes a first bending portion 1352, a second bending portion 1353, and a third bending portion 1354, the first bending portion 1352 is perpendicular to the tab connection portion 131 within a certain error range, the error range is-10 ° to 10 °, that is, the included angle α between the first bending portion 1352 and the tab connection portion 131 is 80 ° to 90 °, referring to fig. 14, the pop-up structure 135 has high strength, in that the impact on the electrode assembly 120 can be reduced when the end cap 160 is abutted, the second bending portion 1353 and the first bending portion 1352 form an obtuse angle with each other, the obtuse angle is defined as β, the third bending portion 1354 and the second bending portion 1353 form an abutting portion 1351 with each other within a certain error range, the formed abutting portion 1 is a smooth curved surface, the impact on the pop-up structure 135 can be prevented from being scratched, the impact on the electrode assembly 120 can be reduced when the end cap 160 is abutted against, the first bending portion 1351 needs to be abutted against the current collecting member 130, and the distance between the first bending portion 1351 and the current collecting member is greater than the current collecting member 130, and the current collecting structure is completely contacted with the current collecting structure is 130: 2-6 mm, the pop-up structure 135 is too narrow to be easily deformed, and too wide may affect the length of the pop-up structure 135.

Referring to fig. 2, 5, 8, 11, 13 and 14, in an example of the cylindrical battery 100 according to the present utility model, a vent area 161 is provided on the end cap 160, the vent area 161 includes a breaking portion 162 provided on the end cap 160, and the breaking portion 162 is configured to break the breaking portion 162 when the pressure in the case 110 is greater than a preset value; specifically, the fracture 162 may be shaped as a closed or non-closed curve, a polygon, an irregular pattern, etc., and the fracture 162 may be, for example, an end cap score 1621 provided on a surface of the end cap 160, and it should be understood that in other embodiments, the fracture 162 may be replaced by other brittle structures, for example, by changing the material of the fracture 162 to have a lower structural strength than other regions of the end cap 160. In this embodiment, the breaking portion 162 is a closed annular end cover notch 1621, and the thickness of the end cover notch 1621 suddenly changes, so when the end cover 160 is stressed, the end cover 160 will first break at the end cover notch 1621 due to the stress concentration phenomenon, and the discharge area 161 falls off to form a discharge port, so as to guide the internal substances to be discharged from the discharge port, and avoid explosion of the cylindrical battery 100; in the height direction of the cylindrical battery 100, the orthographic projection of the discharge area 161 covers the orthographic projection of the tab connection part 131, and when the discharge area 161 is opened, the tab connection part 131 can be folded along the edge of the discharge area 161 to the outside of the discharge area 161, so that the discharge of internal substances is not blocked by the end cap 160.

In order to avoid the above problems, in an example of the cylindrical battery 100 of the present utility model, referring to fig. 13 to 14, the abutting portion 1351 abuts against the end cover 160 and is located in the discharge area 161 or outside the discharge area 161 so as to avoid the end cover score 1621, and in this embodiment, the abutting portion 1351 abuts against the end cover 160 and is located outside the discharge area 161, so as to avoid the explosion valve and further affect the explosion pressure, and also possibly scratch the coating inside the score 13312 and cause the corrosion or the insufficient contact between the abutting portion 135 and the end cover 160; it should be further noted that, the pop-up structures 135 are distributed on the outer side of the central hole 134 along the circumferential direction of the central hole 134, so as to avoid the central hole 134, and ensure the positioning effect of the central hole 134.

Referring to fig. 4, 7 and 10 to 12, in an example of the cylindrical battery 100 according to the present utility model, in order to improve the strength of the first current collecting member 130 and the flatness of the first current collecting member 130, a plurality of reinforcing structures 136 are further disposed on the first current collecting member 130, and four reinforcing structures 136 in this embodiment are also provided, and the reinforcing structures 136 are fan-shaped structures, which are distributed between each two adjacent tab connection portions 131 along the circumferential direction of the cylindrical battery 100 and connect the side edges of the adjacent edges of each two adjacent tab connection portions 131, so that the flatness of the tab connection portions 131 can be improved, and the welding reliability can be improved when the tab connection portions 131 are welded with the first tabs 122.

Referring to fig. 15, the present utility model further provides a battery pack 10, where the battery pack 10 includes the cylindrical battery 100 according to any one of the above, and in an embodiment of the battery pack 10 of the present utility model, the battery pack 10 includes a case 101, a case cover 102, and a plurality of cylindrical batteries 100, the plurality of cylindrical batteries 100 are placed in the case 101 and connected in series or parallel with each other, or mixed in series and parallel with each other, and the case cover 102 covers the case 101 to protect the plurality of cylindrical batteries 100. It should be noted that, the battery pack 10 may also include a thermal management system, a circuit board, etc. of the battery pack 10 in addition to the cylindrical battery 100 of the present utility model, and the battery pack 10 may be a battery module, a battery pack, an energy storage electric cabinet, etc.; and will not be described in detail herein.

Referring to fig. 16, the present utility model further provides an electronic device 1, where the electronic device 1 includes the battery pack 10. The working part 11 is electrically connected with the battery pack 10 to obtain power support. As an example, the electronic device 1 is a vehicle, which may be a fuel-oil vehicle, a gas-fired vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or a range-extended vehicle, but is not limited thereto. The working section 11 is a vehicle body, and the battery pack 10 is provided at the bottom of the vehicle body and provides electric power support for running of the vehicle or running of electric components in the vehicle. However, in other embodiments, the electronic device 1 may also be a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, or the like. Spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the working unit 11 may be a unit member capable of taking electric power of the battery pack 10 and making a corresponding work, such as a blade rotation unit of a fan, a dust suction working unit of a dust collector, or the like. The electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, and electric planers, among others. The embodiment of the present utility model is not particularly limited to the above-described electronic apparatus 1.

In the cylindrical battery, the current collecting member further comprises a plurality of transition connecting parts, each transition connecting part is connected with the lug connecting part and the folded edge, and the transition connecting parts comprise weak areas; when the folded edge of the current collecting member is bent, stress is generated, and the weak area of the transitional connecting part is deformed firstly under the action of the stress, so that the transmission of the stress to the middle part of the current collecting member is reduced, the possibility that the welding part of the current collecting member and the tab is broken due to the stress is reduced, and the risk of failure in the electric connection of the current collecting member and the electrode assembly is further reduced. Therefore, the utility model effectively overcomes some practical problems in the prior art, thereby having high utilization value and use significance. The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims (13)

1. A cylindrical battery, comprising:

The shell comprises a surrounding side wall, an opening is formed at one end of the side wall, and a groove recessed towards the interior of the shell is formed at one end of the shell, which is close to the opening;

an electrode assembly accommodated in the case, the electrode assembly including a tab facing the opening;

An end cap sealingly mounted to the opening;

The current collecting member is arranged between the electrode assembly and the end cover, and comprises a plurality of tab connecting parts and a shell connecting part, wherein the tab connecting parts are fixedly connected with the tabs, the shell connecting parts comprise a plurality of folded edges distributed along the circumferential direction of the cylindrical battery, and the folded edges are bent relative to the tab connecting parts and are fixedly connected with one side of the groove facing the electrode assembly;

The current collecting member further comprises a plurality of transition connecting portions, each transition connecting portion is connected with the tab connecting portion and the folded edge, and the transition connecting portions comprise weak areas.

2. The cylindrical battery according to claim 1, wherein the current collecting member is provided with a center hole corresponding to the center of the electrode assembly, a plurality of tab connection portions are radially distributed centering on the center hole, and one end of each tab connection portion, which is remote from the center hole, is connected to the transition connection portion.

3. The cylindrical battery of claim 1, wherein the weakened area is disposed at an intersection of the transition connection and the tab connection, and wherein a cross-sectional area of the weakened area is smaller than a cross-sectional area of the tab connection.

4. The cylindrical battery of claim 1, wherein the weakened areas are provided as one or a combination of thinned areas, scores, or openings along the thickness of the current collecting member.

5. The cylindrical battery according to claim 1, wherein a tab avoidance region is provided at an end of the electrode assembly adjacent to the current collecting member, the tab avoidance region extends from an edge of the electrode assembly toward a center to form an annular space, and an orthographic projection of the tab avoidance region covers an orthographic projection of the transition connection portion in a height direction of the cylindrical battery.

6. The cylindrical battery according to claim 1, wherein the current collecting member further comprises a plurality of pop-up structures distributed along a circumferential direction of the cylindrical battery, the pop-up structures being bent in a direction away from the electrode assembly and formed with an abutting portion abutting the end cap.

7. The cylindrical battery of claim 6, wherein the pop-up structure comprises a first bending portion, a second bending portion and a third bending portion, the first bending portion is perpendicular to the tab connection portion within a certain error range, the error range is-10 ° to 10 °, the second bending portion and the first bending portion form an obtuse angle bending, the third bending portion and the second bending portion form an obtuse angle bending, and a crease of the third bending portion and the second bending portion forms the abutting portion.

8. The cylindrical battery according to any one of claims 1 to 5, wherein a discharge area is provided on the end cap, an orthographic projection of the discharge area covers an orthographic projection of the tab connection portion in a height direction of the cylindrical battery, and the tab connection portion is folded outward of the discharge area along an edge of the discharge area when the discharge area is opened.

9. The cylindrical battery according to claim 6, wherein a drain region is provided on the end cap, and a position where the abutting portion abuts against the end cap is located inside or outside the drain region.

10. The cylindrical battery of claim 6, wherein the pop-up structure has a width ranging from: 2-6 mm.

11. The cylindrical battery according to claim 1, wherein the current collecting member further comprises a plurality of reinforcing structures which are distributed between each two adjacent tab connection portions in the circumferential direction of the cylindrical battery and connect side edges at the near edges of each two adjacent tab connection portions.

12. A battery pack comprising the cylindrical battery according to any one of claims 1 to 11.

13. An electronic device comprising the battery pack of claim 12.