CN221766869U - Cylindrical battery, battery pack and electronic equipment - Google Patents

Abstract

The utility model provides a cylindrical battery, a battery pack and an electronic device, wherein the cylindrical battery comprises a shell, an electrode assembly, an end cover, a current collecting member, a first sealing piece and a second sealing piece; the shell comprises a side wall, an opening is formed at one end of the side wall, a rolling groove recessed towards the inside of the shell is formed at one end of the side wall, which is close to the opening, and a bulge is formed in the rolling groove; the electrode assembly is accommodated in the case; the end cover is arranged on one side of the bulge, which is away from the electrode assembly, the periphery of the end cover is coated with a first sealing piece, and the opening is sealed by the first sealing piece; the current collecting component is arranged between the electrode assembly and the end cover and comprises a tab connecting part and a shell connecting part, wherein the tab connecting part is electrically connected with the electrode assembly, the shell connecting part is electrically connected with the shell, and the shell connecting part is at least partially positioned between the first sealing piece and the bulge; the second sealing piece is arranged between the shell connecting part and the bulge, so that the technical problem of poor welding stability of the current collecting component and the shell can be solved.

Description

Cylindrical battery, battery pack and electronic equipment

Technical Field

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

Background

The main flow 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 grooves which are sunken towards the inside of the shell are rolled on the side wall of the shell, one side of each rolling groove, deviating from the electrode assembly, bears the end cover, and the end cover is pressed in a pier sealing mode. The welding of the current collecting component and the shell generally adopts the mode that the edge of the current collecting component is lapped on one side of the rolling groove, which is far away from the electrode assembly, and then the current collecting component and the rolling groove are welded and fixed, and the positioning between the current collecting component and the rolling groove in the welding mode is unstable, so that the welding difficulty of the current collecting component and the shell is increased, and the welding stability of the current collecting component and the shell is reduced.

Disclosure of utility model

In view of the above drawbacks of the prior art, the present utility model provides a cylindrical battery, a battery pack, and an electronic device, so as to improve the technical problem of poor welding stability of a current collecting member and a case.

To achieve the above and other related objects, the present utility model provides a cylindrical battery comprising: a case, an electrode assembly, an end cap, a current collecting member, a first seal, and a second seal; the shell comprises a side wall, an opening is formed at one end of the side wall, a rolling groove recessed towards the inside of the shell is formed at one end of the side wall, which is close to the opening, and a bulge is formed in the rolling groove; the electrode assembly is accommodated in the case, and the protrusions restrict displacement of the electrode assembly in the axial direction of the case; the end cover is arranged on one side of the bulge, which is away from the electrode assembly, the periphery of the end cover is coated with a first sealing piece, and the opening is sealed by the first sealing piece; the current collecting component is arranged between the electrode assembly and the end cover and comprises a tab connecting part and a shell connecting part, wherein the tab connecting part is electrically connected with the electrode assembly, the shell connecting part is electrically connected with the shell, and the shell connecting part is at least partially positioned between the first sealing piece and the bulge; a second seal is disposed between the housing connection and the projection.

In one example of the cylindrical battery of the present utility model, the second seal member is of annular configuration.

In an example of the cylindrical battery of the present utility model, the case connection part includes a first welding part, a positioning part, and an extension part, the first welding part is welded to the case, the positioning part is connected to the first welding part and is at least partially clamped between the first sealing member and the second sealing member, and the extension part extends from an edge of the tab connection part to the positioning part or the first welding part.

In an example of the cylindrical battery of the present utility model, the positioning portion extends from a side of the extending portion away from the tab connection portion toward the inner wall of the case, wherein, in the height direction of the case, an end of the extending portion connected to the positioning portion is located between the protrusion and the end cap.

In an example of the cylindrical battery of the present utility model, a side of the side wall facing away from the protrusion includes a flange extending toward the center of the opening, an edge of the end cap is sealed and press-fitted between the flange and the protrusion, and the first welding portion extends from a side of the positioning portion facing away from the extending portion toward the opening and is welded to an inner wall of the flange.

In an example of the cylindrical battery of the present utility model, the extension portion extends from the edge of the tab connection portion to the first welding portion, the positioning portion extends from one end of the first welding portion facing away from the extension portion toward the inner wall of the case, and the first welding portion is welded to the protrusion.

In an example of the cylindrical battery of the present utility model, there are a plurality of the case connection parts, and the case connection parts are radially distributed with the center of the tab connection part as the center.

In one example of a cylindrical battery of the present utility model, at least portions of the plurality of detents are circumferentially connected to form a closed loop profile.

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

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

According to the cylindrical battery, one end of the shell close to the opening comprises the rolling groove recessed towards the interior of the shell, the rolling groove forms the bulge in the side wall, the end cover is arranged on one side of the bulge, which is away from the electrode assembly, the periphery of the end cover is coated with the first sealing element, the shell connecting part is at least partially positioned between the first sealing element and the bulge, the second sealing element is arranged between the shell connecting part and the bulge, the second sealing element prevents direct contact between the shell connecting part and the bulge with a curved surface, and the contact area of the shell connecting part and the second sealing element is larger due to the fact that the second sealing element has certain deformation performance, the positioning stability of the bulge and the shell connecting part is improved, the effect of reducing welding difficulty of a current collecting member and the shell can be achieved, and meanwhile, the effect of welding stability of the current collecting member and the shell is improved.

On the other hand, set up the second sealing member between the protruding of casing connecting portion and curved surface that is the stereoplasm structure together, increased the effective sealed area between end cover and the roll groove, and then improved the sealing performance between end cover and the casing.

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 a schematic view of an electrode assembly of an embodiment of a cylindrical battery according to the present utility model;

FIG. 3 is a schematic view of an embodiment in which the edge of the opening of the cylindrical battery is not sealed;

FIG. 4 is a partial enlarged view at B in FIG. 3;

FIG. 5 is an enlarged view of a portion of FIG. 1 at A of an embodiment of a cylindrical battery according to the present utility model;

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

FIG. 7 is an enlarged view of a portion of FIG. 1A of another embodiment of a cylindrical battery of the present utility model;

FIG. 8 is a partial enlarged view at D in FIG. 7;

FIG. 9 is a schematic view of a second seal of an embodiment of a cylindrical battery of the present utility model;

Fig. 10 is a schematic view of a current collecting member of an embodiment of a cylindrical battery according to the present utility model;

fig. 11 is a schematic view of a current collecting member of another embodiment of a cylindrical battery according to the present utility model;

FIG. 12 is a schematic view of an embodiment of a battery pack according to the present utility model;

fig. 13 is a schematic diagram of an embodiment of an inventive electronic device.

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. rolling grooves; 1122. a protrusion; 1123. flanging; 113. an opening; 120. an electrode assembly; 121. a positive electrode sheet; 1211. a positive electrode current collector; 1212. a first coating zone; 1213. a first uncoated region; 122. a diaphragm; 123. a negative electrode plate; 1231. a negative electrode current collector; 1232. a second coating zone; 1233. a second uncoated region; 124. a first tab; 125. a second lug; 130. a current collecting member; 131. a tab connection part; 1311. a through hole; 1312. a second welded portion; 132. a housing connection portion; 1321. a first welded portion; 1322. a positioning part; 1323. an extension; 140. a first seal; 150. a pole; 160. an end cap; 170. and a second seal.

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.

In the present application, the cylindrical battery includes an electrode assembly, which is a component of the cylindrical battery in which electrochemical reaction occurs, and may include one or more electrode assemblies.

The cylindrical battery further comprises a shell, an end cover and a current collecting member, wherein the shell comprises an end wall and a side wall surrounding the end wall, one end of the side wall is provided with an opening, an electrode assembly can be assembled into the shell through the opening of the shell, the end cover is used for covering the opening of the shell to realize sealing, the main flow packaging mode of the conventional cylindrical battery is mechanical sealing, the mechanical sealing has the advantages of process and equipment maturity and quick production beat, the process and equipment are widely applied, and the current collecting member is electrically connected with the electrode assembly and the shell at the same time to realize the electrical connection of the electrode assembly and the shell.

Specifically, the one end that the casing lateral wall is close to the open-ended is provided with the indent to the inside indent of casing, this indent can restrict electrode assembly's axial displacement, the end cover is installed on the step that one side that the indent deviates from the end wall formed, be provided with sealing member between end cover and the casing, sealing member's material can be ethylene propylene diene monomer rubber, fluorosilicone rubber or fluorine plain rubber etc. but does not limit to this, open-ended edge adopts mound mode to make the end cover compress tightly sealing member, form reliable connection, realize the sealing of casing, in order to guarantee the sealed effect of mechanical seal, adopt the sealing member that the cross-section is the U type generally, with the equal parcel of three sides at end cover edge and compress tightly.

There are various connection modes of the current collecting member and the case, and one of common uses is: the edge of the current collecting member is lapped on one side of the rolling groove, which is far away from the electrode assembly, and then the edge of the current collecting member and the rolling groove are welded and fixed, however, the inventor finds that the positioning between the current collecting member and the rolling groove is unstable due to the curved surface of the wall surface of the rolling groove, so that the welding difficulty is high, the welding stability of the current collecting member mixed shell is reduced, and in addition, the lap joint position of the current collecting member and the rolling groove occupies the contact area of part of the sealing element and the rolling groove, so that the sealing performance of the sealing element on the shell and the end cover is weakened.

In view of the above, the present utility model provides a technical solution, in which a second sealing element is added between the rolling groove and the current collecting member, so that direct contact between the rolling groove and the current collecting member is avoided, and the elastic deformation performance of the second sealing element is utilized, so that the contact area between the current collecting member and the second sealing element is larger, the positioning stability of the current collecting member is improved, and meanwhile, the second sealing element increases the effective sealing area between the end cover and the rolling groove, so as to further improve the sealing performance between the end cover and the housing.

Referring to fig. 1 to 13, the structure of the cylindrical battery 100 will be further described, and the cylindrical battery 100 includes: the electrode assembly includes a case 110, an electrode assembly 120, an end cap 160, a current collecting member 130, a first seal 140, and a second seal 170.

Referring to fig. 1, fig. 1 is a schematic overall structure of an embodiment of a cylindrical battery 100 according to the present utility model, in which a case 110 includes an end wall 111 and a side wall 112 surrounding the end wall 111, so long as a stable sealing and electrical connection relationship can be formed, the connection between the end wall 111 and the side wall 112 can be achieved in various manners, for example, in the form of integral stamping, integral casting, or split welding. 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 chamber for housing the electrode assembly 120, the electrolyte and other necessary components of the battery is formed in the case 110 surrounded by the end wall 111 and the side wall 112. 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 and 2, 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. The case 110 may contain one or more electrode assemblies 120 therein. The electrode assembly 120 includes a positive electrode tab 121, a separator 122, and a negative electrode tab 123 axially wound around the case 110, the positive electrode tab 121 including a positive electrode current collector 1211 and a positive electrode active material layer coated on the positive electrode current collector 1211, a first coated region 1212 coated with the positive electrode active material layer and a first uncoated region 1213 uncoated with the positive electrode active material layer being formed on the positive electrode tab 121, the first coated region 1212 and the first uncoated region 1213 being axially aligned along the case 110, the first uncoated region 1213 extending out of the separator 122 toward one end of the cylindrical battery 100 in the height direction and being bent toward the axis of the case 110 to form a stacked positive electrode tab. The negative electrode tab 123 includes a negative electrode current collector 1231 and a negative electrode active material layer coated on the negative electrode current collector 1231, a second coated region 1232 coated with the negative electrode active material layer and a second uncoated region 1233 uncoated with the negative electrode active material layer are formed on the negative electrode tab 123, the second coated region 1232 and the second uncoated region 1233 are axially aligned along the case 110, the second uncoated region 1233 extends to the outside of the separator 122 toward the other end in the height direction of the cylindrical battery 100, and is bent toward the axis of the case 110 to form a stacked negative electrode tab; the separator 122 is disposed between the positive electrode tab 121 and the negative electrode tab 123 to isolate the electrode active material layer from the negative electrode active material layer. Taking the lithium ion cylindrical battery 100 as an example, the material of the positive electrode current collector 1211 may be aluminum, the positive electrode active material layer 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 anode current collector 1231 may be copper, the anode active material layer includes an anode active material, and the anode active material may be carbon, silicon, or the like. The material of the membrane 122 may be 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.

Referring to fig. 1 and 2, further, the electrode assembly 120 of the present utility model includes a first tab 124 facing the opening 113 and a second tab 125 facing the end wall 111, the second tab 125 may be a positive tab or a negative tab, the first tab 124 and the second tab 125 are opposite in electrical property, in this embodiment, the second tab 125 is a positive tab, the electrode post 150 and the second tab 125 are electrically connected to each other to be positively charged, the first tab 124 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 124 to be negatively charged. However, in other embodiments, the second tab 125 may be a negative tab and the first tab 124 may be a positive tab.

Further, referring to fig. 1, the second tab 125 may be directly electrically connected to the pole 150 or the housing 110, preferably, the second tab 125 may also be connected to the current collecting member 130 through the current collecting member 130, in this embodiment, both the second tab 125 and the first tab 124 are connected to the current collecting member 130, the material of the current collecting member 130 is selected according to the polarity of the tab connected to the current collecting member, for example, if the current collecting member 130 is connected to the positive tab, the current collecting member 130 may be aluminum metal, if the current collecting member 130 is connected to the negative tab, the material may be copper metal, and the shape and structure of the current collecting member 130 are not limited, so as to achieve a stable and reliable electrical connection relationship.

Referring to fig. 1, the pole 150 passes through the end wall 111 and is insulated from the end wall 111. The structural form of the electrode post 150 may be any suitable form that can be electrically connected to the second electrode lug 125 of the electrode assembly 120 through the end wall 111, for example, the cross section may be circular, square, prismatic, or a special-shaped profile that can realize stable conduction, one end of the electrode post 150 facing the electrode assembly 120 is directly electrically connected to the second electrode lug 125 through the end wall 111 or is electrically connected through indirect switching, one end of the electrode post 150 facing away from the electrode assembly 120 is exposed to the outside of the housing 110, so as to form a corresponding electrode, the electrical property of the electrode post 150 may be positive or negative, for example, in an embodiment, the polarity of the second electrode lug 125 is the negative electrode lug, the electrode post 150 is the negative electrode, and the housing 110 forms a corresponding positive electrode. In this embodiment, the second tab 125 has a positive polarity, and the post 150 is a positive polarity, so that the housing 110 forms a corresponding negative electrode.

Referring to fig. 1 and 3 to 8, the end cap 160 is sealingly mounted to the opening 113; the shape of the outer edge of the end cap 160 corresponds to the shape of the opening 113 and is connected with the side wall 112 to seal the opening 113, the installation mode of the end cap 160 includes but is not limited to mechanical sealing or welding sealing, in this embodiment, the end cap 160 is sealed and plugged on the opening 113 in a mechanical sealing mode, specifically, one end of the side wall 112 near the opening 113 is provided with a rolling groove 1121 recessed towards the inside of the shell 110, the rolling groove 1121 forms a protrusion 1122 in the inside of the side wall 112, the protrusion 1122 can limit the displacement of the shell 110 of the electrode assembly 120 in the axial direction, the end cap 160 is installed on one side of the protrusion 1122 facing away from the electrode assembly 120, the periphery of the end cap 160 is covered with a first sealing member 140, and the first sealing member 140 seals the opening 113; the first sealing member 140 may be made of ethylene propylene diene monomer rubber, fluorosilicone rubber or fluororubber, but is not limited thereto, the edge of the opening 113 is sealed by a pier to press the end cap 160 against the first sealing member 140 to form a reliable connection, so as to seal the housing 110, in order to ensure the sealing effect of the mechanical seal, an insulating sealing member with a U-shaped cross section is generally used to wrap and press three sides of the edge of the end cap 160, and meanwhile, the end cap 160 and the housing 110 are separated by the insulating sealing member, please refer to fig. 3 to 6, fig. 3 is a schematic structural diagram of an embodiment in which the edge of the opening 113 of the cylindrical battery 100 is not sealed by a pier, fig. 4 is a partially enlarged view of a portion of fig. 3, fig. 5 is a partially enlarged view of a portion of fig. 1, and fig. 6 is a partially enlarged view of a portion of C of fig. 5.

Referring to fig. 1 and 5 to 8, in an embodiment of the cylindrical battery 100 according to the present utility model, a current collecting member 130 is disposed between an electrode assembly 120 and an end cap 160, a case 110 and the electrode assembly 120 are electrically connected through the current collecting member 130, specifically, the current collecting member 130 includes a tab connection part 131 and a case connection part 132, the tab connection part 131 is electrically connected with the electrode assembly 120, and the shape and size of the tab connection part 131 and the case connection part 132 are not limited, so long as the tab connection part 131 can form a stable and reliable connection with the first tab 124, and the case connection part 132 can form a stable and reliable connection with the case 110; in this embodiment, the current collecting member 130 is fixedly connected to the first tab 124, and the fixing connection manner includes welding connection, including but not limited to laser welding, etc., and the housing connection portion 132 is electrically connected to the housing 110, and the electrical connection manner includes direct fixing connection, and also includes that the 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 electrically connect the housing 110 to the electrode assembly 120.

In an embodiment of the cylindrical battery 100 of the present utility model, referring to fig. 5 to 8, the current collecting member 130 is directly electrically connected to the case 110, and the case connecting portion 132 is at least partially located between the first sealing member 140 and the protrusion 1122; the housing connection portion 132 is directly welded to the housing 110, and the welding position is not limited, and may be any position suitable for welding and fixing, for example, may be any position of the inner wall of the housing 110 or the protrusion 1122; the second sealing member 170 is disposed between the housing connecting portion 132 and the protrusion 1122, and the material of the second sealing member 170 is not limited, and may be any material having elastic deformation properties, such as various rubbers, plastic elastomers, and the like; the shape of the second sealing member 170 is not limited, and for example, the second sealing member may be a unitary annular structure or a plurality of discrete fan-shaped annular structures, and the second sealing member may be any size as long as it is at least partially located between the housing connecting portion 132 and the protrusion 1122, and is capable of supporting and positioning the housing connecting portion 132; the arrangement of the second sealing member 170 avoids direct contact between the shell connecting portion 132 and the curved protrusion 1122, and since the second sealing member 170 has a certain deformation performance, on one hand, the second sealing member 170 can form adaptive deformation with the curved surface of the protrusion 1122 to realize sealing fit, on the other hand, the contact area between the shell connecting portion 132 and the second sealing member 170 is larger, the stability of positioning the protrusion 1122 and the shell connecting portion 132 is improved, the effect of reducing the welding difficulty of the current collecting member 130 and the shell 110 can be realized, and meanwhile, the effect of improving the welding stability of the current collecting member 130 and the shell 110 is improved, on the other hand, the second sealing member 170 is arranged between the shell connecting portion 132 and the curved protrusion 1122, which are both of a hard structure, so that the effective sealing area between the end cover 160 and the rolling groove 1121 is increased, and the sealing performance between the end cover 160 and the shell 110 is further improved.

In an embodiment of the cylindrical battery 100 of the present utility model, referring to fig. 5 to 9, the second sealing member 170 has an annular structure to form a closed-loop profile, which forms a continuous seal between the first sealing member 140 and the protrusion 1122, and increases the effective sealing area between the end cap 160 and the protrusion 1122, thereby improving the sealing performance between the end cap 160 and the case 110, and at the same time, the annular closed-loop profile can improve the positioning stability of the second sealing member 170 to the case connecting portion 132.

In an embodiment of the cylindrical battery 100 of the present utility model, referring to fig. 5 to 8, the housing connecting portion 132 includes a first welding portion 1321, a positioning portion 1322 and an extending portion 1323, where the first welding portion 1321 is welded to the housing 110, so that the housing 110 and the current collecting member 130 can be electrically connected, the positioning portion 1322 is connected to the first welding portion 1321, the positioning portion 1322 is used for positioning the housing connecting portion 132, so that the welding difficulty of the first welding portion 1321 and the housing 110 is reduced, the welding is more firm, specifically, the positioning portion 1322 is at least partially clamped between the first sealing member 140 and the second sealing member 170, and both the first sealing member 140 and the second sealing member 170 are members capable of generating elastic deformation, so that both the first sealing member 140 and the second sealing member 170 can realize adaptive deformation to the positioning portion 1322 to clamp and position the positioning portion 1322, thereby increasing the effective sealing area between the end cover 160 and the rolling groove 1121 and further improving the sealing performance between the end cover 160 and the housing 110. Since the positioning portion 1322 is higher than the tab connection portion 131 in the height direction of the case 110, the extending portion 1323 needs to extend outward from the edge of the tab connection portion 131 and to a side away from the electrode assembly 120, and the outward refers to a direction away from the center of the tab connection portion 131. Also, since the position of the first welding portion 1321 welded to the case 110 is not limited, when the first welding portion 1321 is welded to the projection 1122, the first welding portion 1321 is located between the positioning portion 1322 and the extending portion 1323, the extending portion 1323 extends to the first welding portion 1321, as shown in fig. 7 to 8, and when the first welding portion 1321 is welded to the inner wall of the case 110, the positioning portion 1322 is located between the first welding portion 1321 and the extending portion 1323, and the extending portion 1323 extends to the positioning portion 1322, as shown in fig. 5 to 6.

It should be noted that, the casing connecting portion 132 is a structure that is electrically connected to the casing 110, the first welding portion 1321 achieves a welding effect, the positioning portion 1322 achieves a better positioning effect, so as to reduce the welding difficulty and improve the welding quality, and the extending portion 1323 is used to extend the positioning portion 1322 and the first welding portion 1321 in the height direction of the cylindrical battery 100 toward the direction of the protrusion 1122, so that the positioning portion 1322 and the first welding portion 1321 are higher than the tab connecting portion 131 to achieve overlap welding with the protrusion 1122, and the number, structure and size of the casing connecting portion 132 are not limited, and may be a whole annular structure, a structure with a plurality of discrete distributions, or may be only provided, so long as the electrical connection between the casing 110 and the electrode assembly 120 can be achieved.

In an embodiment of the cylindrical battery 100 of the present utility model, referring to fig. 5 to 6, the first welding portion 1321 is welded to the inner wall of the housing 110, the positioning portion 1322 is located between the first welding portion 1321 and the extending portion 1323, the extending portion 1323 extends to the positioning portion 1322, and the positioning portion 1322 extends from the side of the extending portion 1323 away from the tab connection portion 131 toward the inner wall of the housing 110, so that the positioning effect of the positioning portion 1322 is better, and the surface of the positioning portion 1322 contacting the second sealing member 170 is parallel as much as possible, so that, in the height direction of the housing 110, the end, connected to the positioning portion 1323, is located between the protrusion 1122 and the end cap 160, so as to achieve the beneficial effect of reducing the welding difficulty between the first welding portion 1321 and the housing 110.

Further, in an embodiment of the cylindrical battery 100 of the present utility model, as shown in fig. 5 to 6, a side of the side wall 112 facing away from the protrusion 1122 includes a flange 1123 extending toward the center of the opening 113, and an edge of the end cap 160 is sealed and pressed between the flange 1123 and the protrusion 1122, so as to encapsulate the end cap 160, and the first welding portion 1321 extends from the positioning portion 1322 away from the side of the extending portion 1323 toward the opening 113 and is welded to the inner wall of the flange 1123, and the arrangement is such that the welding position of the first welding portion 1321 and the housing 110 is located at the side of the first sealing member 140 facing away from the electrode assembly 120, so that the welding slag generated by welding the first welding portion 1321 and the housing 110 is isolated by the first sealing member 140 and the second sealing member 170, which can effectively improve the problem that the welding slag generated by welding the current collecting member 130 and the housing 110 enters the interior of the housing 110, and further improve the safety performance of the cylindrical battery 100.

In another embodiment of the cylindrical battery 100 of the present utility model, referring to fig. 7 to 8, when the first welding portion 1321 is welded to the protrusion 1122, the first welding portion 1321 is located between the positioning portion 1322 and the extending portion 1323, the extending portion 1323 extends from the edge of the tab connecting portion 131 to the first welding portion 1321, the positioning portion 1322 extends from one end of the first welding portion 1321 facing away from the extending portion 1323 toward the inner wall of the housing 110, and the first welding portion 1321 is welded to the protrusion 1122, in this arrangement, the positioning portion 1322 is positioned in cooperation with the second sealing member 170, so that the welding difficulty of the first welding portion 1321 and the protrusion 1122 is reduced, the reliability of the welding is improved, and preferably, in the height direction of the housing 110, the end of the first welding portion 1321 connected to the positioning portion 1322 is located between the protrusion 1122 and the end cap 160, so that the surface of the positioning portion 1322 contacting the second sealing member 170 is parallel as much as possible, and the positioning of the positioning portion 1322 is more reliable.

In an embodiment of the cylindrical battery 100 of the present utility model, referring to fig. 5, 7, 10 and 11, a through hole 1311 is provided at the center of the tab connection part 131, and for the reliability of welding the tab connection part 131 and the first tab 124, the tab connection part 131 further includes four second welding parts 1312 radially distributed around the through hole 1311, and the four second welding parts 1312 are uniformly distributed around the through hole 1311 to form a cross-shaped welding area with the first tab 124, which can increase the welding area between the current collecting member 130 and the first tab 124 and weld more turns of the first tab 124 in the radial direction, so as to achieve the effect of reducing the internal resistance of the electrode assembly 120. The plurality of shell connecting parts 132 are radially distributed by taking the center of the tab connecting part 131 as the center, and the shell connecting parts 132 realize reliable connection with the shell 110, lighten the quality of the cylindrical battery 100 and are beneficial to heat dissipation of the cylindrical battery 100.

In view of the fact that the discrete distribution of the plurality of positioning portions 1322 may cause the flatness thereof to be reduced, and thus affect the positioning effect of the positioning portions 1322, in an embodiment of the cylindrical battery 100 of the present utility model, referring specifically to fig. 10, at least part of the plurality of positioning portions 1322 are connected circumferentially to form a closed-loop profile, so as to achieve that the plurality of positioning portions 1322 are connected to a plane, preferably, the closed-loop profile is at least partially clamped between the first sealing member 140 and the second sealing member 170, which arrangement may enable the spacing between the first sealing member 140 and the second sealing member 170 to be the same in the circumferential direction of the cylindrical battery 100, so that the end cover 160 and the housing 110 achieve a better sealing effect.

Referring to fig. 12, 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. 13, 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.

According to the cylindrical battery, one end of the shell close to the opening comprises the rolling groove recessed towards the interior of the shell, the rolling groove forms the bulge in the side wall, the end cover is arranged on one side of the bulge, which is away from the electrode assembly, the periphery of the end cover is coated with the first sealing element, the shell connecting part is at least partially positioned between the first sealing element and the bulge, the second sealing element is arranged between the shell connecting part and the bulge, the second sealing element prevents direct contact between the shell connecting part and the bulge with a curved surface, and the contact area of the shell connecting part and the second sealing element is larger due to the fact that the second sealing element has certain deformation performance, the positioning stability of the bulge and the shell connecting part is improved, the effect of reducing welding difficulty of a current collecting member and the shell can be achieved, and meanwhile, the effect of welding stability of the current collecting member and the shell is improved. On the other hand, set up the second sealing member between the protruding of casing connecting portion and curved surface that is the stereoplasm structure together, increased the effective sealed area between end cover and the roll groove, and then improved the sealing performance between end cover and the casing. 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 (10)

1. A cylindrical battery, comprising:

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

An electrode assembly accommodated in the case, the protrusion restricting displacement of the electrode assembly in an axial direction of the case;

The end cover is arranged on one side, away from the electrode assembly, of the bulge, a first sealing piece is coated on the periphery of the end cover, and the opening is sealed by the first sealing piece;

The current collecting component is arranged between the electrode assembly and the end cover, and comprises a tab connecting part and a shell connecting part, wherein the tab connecting part is electrically connected with the electrode assembly, the shell connecting part is electrically connected with the shell, and the shell connecting part is at least partially positioned between the first sealing piece and the protrusion;

wherein a second seal is provided between the housing connection and the projection.

2. The cylindrical battery of claim 1, wherein the second seal is an annular structure.

3. The cylindrical battery according to claim 1, wherein the case connecting portion includes a first welding portion, a positioning portion, and an extension portion, the first welding portion being welded to the case, the positioning portion being connected to the first welding portion and being at least partially sandwiched between the first sealing member and the second sealing member, the extension portion extending from an edge of the tab connecting portion to the positioning portion or the first welding portion.

4. The cylindrical battery according to claim 3, wherein the positioning portion extends from a side of the extending portion remote from the tab connecting portion toward an inner wall of the case, wherein an end of the extending portion connected to the positioning portion is located between the protrusion and the end cap in a height direction of the case.

5. The cylindrical battery according to claim 4, wherein a side of the side wall facing away from the projection includes a flange extending toward a center of the opening, an edge of the end cap is sealed and press-fitted between the flange and the projection, and the first welding portion extends from a side of the positioning portion facing away from the extending portion toward the opening and is welded to an inner wall of the flange.

6. The cylindrical battery according to claim 3, wherein the extension portion extends from an edge of the tab connection portion to the first welding portion, the positioning portion extends from an end of the first welding portion facing away from the extension portion toward an inner wall of the case, and the first welding portion is welded with the protrusion.

7. The cylindrical battery according to claim 3, wherein the plurality of case connection parts are radially distributed centering around the center of the tab connection part.

8. The cylindrical battery of claim 7, wherein at least portions of the plurality of locating portions are circumferentially connected to form a closed loop profile.

9. A battery pack comprising the cylindrical battery according to any one of claims 1 to 8.

10. An electronic device comprising the battery pack of claim 9.