CN218182338U

CN218182338U - Cylindrical battery and electric equipment thereof

Info

Publication number: CN218182338U
Application number: CN202221365120.8U
Authority: CN
Inventors: 於洪将
Original assignee: Jiangsu Zenergy Battery Technologies Co Ltd
Current assignee: Jiangsu Zenio New Energy Battery Technologies Co Ltd
Priority date: 2022-06-02
Filing date: 2022-06-02
Publication date: 2022-12-30
Anticipated expiration: 2032-06-02

Abstract

The utility model belongs to the technical field of batteries, in particular to a cylindrical battery and electric equipment thereof, wherein the cylindrical battery comprises a shell, an electric core and a cover plate component, and the shell is of a tubular structure with an opening; the battery cell is arranged in the shell and comprises a main body part and a first lug, and the first lug is arranged on one side of the main body part; the cover plate assembly covers the opening and is connected with the shell in a sealing mode; the cover plate assembly comprises a cover plate and a first current collecting member, the cover plate is electrically connected with the first pole lug through the first current collecting member, and the cover plate is fixedly connected with the shell through welding. Compare with conventional cylinder battery mound seal, the utility model provides a pair of cylinder battery seals through passing through laser welding with apron and housing end face, has improved the gas tightness of cylinder battery.

Description

Cylindrical battery and electric equipment thereof

Technical Field

The utility model belongs to the technical field of the battery, concretely relates to cylinder battery and consumer thereof.

Background

The lithium ion battery has the advantages of high energy density, long cycle life, good rate capability and safety, and environmental protection, and is an important energy product for modern electronic products and power automobiles. The cylindrical battery has the advantages of high energy density, high safety and low cost, and becomes one of important research directions in the field of power batteries, and based on the cognition of battery safety and economy, the cylindrical battery becomes the main power battery form of a medium-high-end new energy vehicle, and the advantages of the cylindrical battery are embodied in extreme standards, extreme reliability, extreme manufacturing and extreme systems, for example, in reliability, the cylindrical battery has the expansion resistance which hardly changes in the radial direction, and has stable structure and zero stress in the whole life cycle, so that the cylindrical battery becomes the preferred battery in the fields of electronic products and power automobiles, and the large-scale application of the cylindrical battery is promoted.

At present, a cylindrical battery mainly adopts a kneading and flattening mode to shape all lugs so that the lugs are mutually contacted, and then a connecting sheet is kneaded and flattened to be welded with the lugs; the positive connecting piece is welded with the positive pole column, and the negative connecting piece is welded with the inner wall of the steel shell; in practical application, however, the negative connecting sheet and the inner wall of the steel shell are difficult to weld, and the welding goodness rate is low; meanwhile, the welding area of the connecting sheet can occupy a certain space in the shell, and the space utilization rate inside the battery cell is reduced.

SUMMERY OF THE UTILITY MODEL

One of the purposes of the utility model lies in: to the not enough of prior art, provide a cylinder battery, solved the poor problem of cylinder battery gas tightness.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a cylindrical battery comprising:

the battery comprises a shell, a battery cell and a cover plate assembly, wherein the shell is of a cylindrical structure with an opening; the battery cell is arranged in the shell and comprises a main body part and a first lug, and the first lug is arranged on one side of the main body part; the cover plate assembly covers the opening and is connected with the shell in a sealing mode; the cover plate assembly comprises a cover plate and a first current collecting member, the cover plate is electrically connected with the first pole lug through the first current collecting member, and the cover plate is fixedly connected with the shell through welding.

Further, the thickness ratio of the cover plate to the shell is 1.0-1.5.

Furthermore, the welding penetration of the cover plate and the shell is 0.2 mm-0.8 mm.

Further, the battery cell comprises a second tab with a polarity opposite to that of the first tab, and the second tab is located on the other side of the battery cell main body part.

The secondary battery further comprises a second current collecting component, and the second tab is electrically connected with the second current collecting component.

The terminal post is arranged on the bottom wall of the shell and penetrates through the terminal post leading-out hole, one end of the terminal post is used for being connected with an external circuit, and the other end of the terminal post is used for being connected with the second current collecting component.

Furthermore, the first current collecting component comprises a disc body, a connecting sheet and a tail body, the connecting sheet is formed by bending the tail body along the connecting position of the tail body and the disc body towards the direction close to the disc body, and the disc body is used for being connected with a first pole lug.

Further, the disk body, the connecting piece and the tail body are integrally formed.

Further, an arc-shaped or annular welding part is arranged between the cover plate and the tail body, and the ratio of the inner diameter of the welding part of the cover plate to the diameter of the cover plate is 15% -96%.

Further, the battery also comprises a first insulating piece for insulating the shell from the second pole ear of the battery core.

Further, the first insulating member includes a base body provided between the second current collecting member and the case, and a projection formed by projecting the base body portion in an axial direction thereof, the projection being provided between the battery cell and the case.

Further, the pole post further comprises a second insulating piece, and the second insulating piece is used for insulating the pole post and the shell.

The utility model discloses a second of purpose lies in: an electric device is provided, comprising the cylindrical battery.

The beneficial effects of the utility model reside in that: a cylindrical battery comprises a shell, a battery core and a cover plate assembly, wherein the shell is of a cylindrical structure with an opening; the battery cell is arranged in the shell and comprises a main body part and a first lug, and the first lug is arranged on one side of the main body part; the cover plate assembly covers the opening and is connected with the shell in a sealing mode; the cover plate assembly comprises a cover plate and a first current collecting component, the cover plate is electrically connected with the first tab through the first current collecting component, and the cover plate is fixedly connected with the shell through welding. Compare with conventional cylinder battery mound seal, the utility model provides a pair of cylinder battery seals through passing through laser welding with apron and housing end face, has improved the gas tightness of cylinder battery.

Drawings

Features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a cylindrical power battery according to embodiment 1 of the present invention;

fig. 2 is a second schematic structural diagram of a cylindrical power battery according to embodiment 1 of the present invention;

FIG. 3 is a right side view of FIG. 2;

fig. 4 is a left side view of fig. 2.

Wherein the reference numerals are as follows:

1. a housing; 2. an electric core; 3. a cover plate assembly; 31. a cover plate; 32. a first current collecting member; 321. a tray body; 322. connecting sheets; 323. a tail body; 4. a second current collecting member; 5. a pole column; 6. a first insulating member; 61. a substrate; 62. a convex body; 7. a second insulating member.

Detailed Description

As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. The description and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect.

In the description of the application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

In the description of the present application, unless explicitly stated or limited otherwise, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more; the terms "connected," "secured," and the like are to be construed broadly and unless otherwise stated or indicated, and for example, "connected" may be a fixed connection, a removable connection, an integral connection, or an electrical connection; "connected" may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

The present invention will be described in further detail with reference to fig. 1 to 4, but the present invention is not limited thereto.

Example 1

Referring to fig. 1 and 2, embodiment 1 of the present invention provides a cylindrical battery, which includes a casing 1, a battery core 2, and a cover plate assembly 3.

Specifically, the housing 1 is a cylindrical structure having an opening; the battery cell 2 is arranged in the shell 1, the battery cell 2 comprises a main body part and a first tab, and the first tab is arranged on one side of the main body part; the cover plate component 3 covers the opening and is connected with the shell 1 in a sealing way; the cover plate assembly 3 includes a cover plate 31 and a first current collecting member 32, the cover plate 31 is electrically connected to the first tab through the first current collecting member 32, and the cover plate 31 and the housing 1 are fixedly connected by welding. Compare with conventional cylinder battery mound seal, the utility model provides a pair of cylinder battery seals through passing through

laser welding apron

31 and 1 terminal surface of casing, has improved the gas tightness of cylinder battery.

In this embodiment 1, the battery cell 2 is formed by winding a first pole piece, a second pole piece, and a diaphragm, where the diaphragm is an insulator between the first pole piece and the second pole piece, and the first pole piece may be a positive pole piece or a negative pole piece; correspondingly, the second pole piece is a negative pole piece or a positive pole piece.

The casing 1 of the existing cylindrical battery is easy to deform, and after research, the cylindrical battery is found to generate gas due to the fact that electrochemical reaction is generated inside the cylindrical battery in the charging and discharging process, so that the amount of gas inside the casing 1 is increased continuously, and when the gas pressure inside the casing 1 reaches a certain degree, the casing 1 deforms under stress.

Based on this, the ratio of the thickness of the cover plate 31 to the thickness of the case 1 in this embodiment 1 is 1.0 to 1.5. This kind of structural design for casing 1 intensity is higher, and when the battery was inside to produce a large amount of gas, casing 1 can bear bigger inside atmospheric pressure, makes casing 1 be difficult to take place deformation, moreover, also is convenient for weld apron 31 and casing 1, can make the sealed effect of cylinder battery better.

Preferably, the weld penetration of the cover plate 31 and the casing 1 is 0.2mm to 0.8mm, which can improve the welding strength therebetween, so that the resistance is smaller when the current in the battery cell 2 is conducted to the other end of the casing 1 through the cover plate 31.

Preferably, the battery cell 2 in this embodiment 1 includes a second tab with a polarity opposite to that of the first tab, and a second current collecting member 4, where the second tab is located on the other side of the main body portion of the battery cell 2, and the second tab is electrically connected to the second current collecting member 4.

Referring to fig. 1 and 2, the cover plate assembly 3 according to embodiment 1 of the present invention includes a cover plate 31 and a first current collecting member 32, and more specifically, the first current collecting member 32 and the cover plate 31 are of an integral structure, for example, can be manufactured by stamping, rolling or die forming, so that the cover plate assembly 3 has high mechanical rigidity, and is not easy to deform or break, and moreover, the first current collecting member 32 and the cover plate 31 do not need to be welded, thereby solving the problem that the welding zone occupies the internal space of the battery. In the present embodiment 1, the first current collecting member 32 is machined using a metal conductive material, such as copper or aluminum, and accordingly, the lid plate 31 is also machined using a metal conductive material, such as copper, aluminum or steel. In practical production applications, the first current collecting member 32 and the cover plate 31 are electrically connected in advance and formed into an integrated structure in advance, then the first tab and the first current collecting member 32 are welded by laser welding, the second tab and the second current collecting member 4 are welded by laser welding, and then the battery cell 2 is placed in the case 1.

It should be noted that, the first current collecting member 32 and the cover plate 31 are of an integrated structure, so that the number of parts of the battery cell 2 is reduced, the space occupancy rate is reduced, and the process flow is simplified, and moreover, the cover plate 31 located at the negative electrode end and the end face of the casing 1 can be sealed by laser welding, so that compared with the pier sealing process, the air tightness of the casing 1 is improved.

The embodiment 1 provides a cylindrical battery still includes utmost point post 5, and 1 diapire of casing is provided with utmost point post and draws forth the hole, and utmost point post 5 passes utmost point post and draws forth the hole, and 5 one ends of utmost point post are used for being connected with external circuit, and the 5 other ends of utmost point post are used for being connected with second mass flow component 4.

Specifically, the first current collecting member 32 includes a disc 321, a connection piece 322, and a tail body 323, the connection piece 322 is formed by bending the tail body 323 along a connection portion with the disc 321 toward a direction close to the disc 321, and the disc 321 is used for connection with a first tab. In the use process of the cylindrical battery, the first current collecting component 32 can fasten and buffer the battery core 2 in the battery, so that the battery core 2 cannot move due to external bumping and vibration, and the first current collecting component 32 and the first tab, and the first current collecting component 32 and the cover plate 31 are ensured to be firmly connected.

Preferably, the tray body 321, the connecting piece 322 and the tail body 323 are integrally formed, so that the production process can be reduced, and the manufacturing difficulty can be reduced.

Because the liquid injection hole is formed in the center of the cylindrical battery, an arc-shaped or annular welding part is formed between the cover plate 31 and the tail body 323, the ratio of the inner diameter of the welding area on the cover plate 31 to the diameter of the cover plate 31 is larger than 15%, but the welding area cannot be too close to the edge of the cover plate 31, the sealing welding is prevented from being influenced, and therefore the ratio of the inner diameter of the welding area on the cover plate 31 to the diameter of the cover plate 31 is smaller than 96%.

The embodiment 1 of the utility model provides a cylindrical battery still includes first insulator 6 for it is insulating with the second pole ear of casing 1 and electric core 2.

Specifically, the first insulating member 6 includes a base body 61 and a projection 62 formed by partially projecting the base body 61 in the axial direction thereof, the base body 61 is disposed between the second current collecting member 4 and the case 1, and the projection 62 is disposed between the battery cell 2 and the case 1. In the charging process of the cylindrical battery, because lithium ions are separated from the positive electrode and embedded into the negative electrode, the distance between the negative electrode layers is increased, and the phenomenon that the battery cell 2 expands can occur, the convex body 62 of the first insulating part 6 is positioned between the battery cell 2 and the shell 1, the convex body 62 can firstly exert constraint on the battery cell 2 to limit the expansion deformation amount of the battery cell 2, after the expansion degree of the battery cell 2 is continuously increased and the convex body 62 is extruded to generate large deformation, the convex body 62 absorbs and buffers the expansion deformation amount of the battery cell 2 through elastic deformation, so that the extrusion force generated by the expansion of the battery cell 2 disappears in the convex body 62, and the convex body 62 is only partially embedded in a gap formed between the battery cell 2 and the shell 1, the position of the battery cell 2 is limited by the convex body 62, the battery cell 2 is prevented from being attached to the shell 1, so that a certain space is left between the battery cell 2 and the shell 1, the problem that the battery cell 2 expands to cause battery deformation is effectively prevented, and the use safety of the secondary battery is improved.

Preferably, a second insulating member 7 is further included, the second insulating member 7 serving for insulation between the pole 5 and the housing 1.

The utility model provides a first insulating part 6 and second insulating part 7 in 1 are insulating material, and it can be that materials such as rubber, plastics are made, and plastics can be PBT (Polybutylene terephthalate), PET (Polyethylene terephthalate), PA (Polyamide ) etc..

Example 2

The embodiment 2 of the utility model provides an electric equipment, including the cylinder battery among the above-mentioned embodiment 1.

The electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool and the like. The vehicle can be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle and the like; spacecraft include aircraft, rockets, space shuttles, and spacecraft, among others; electric toys include stationary or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric airplane toys, and the like; the electric power tools include metal cutting electric power tools, grinding electric power tools, assembly electric power tools, and electric power tools for railways, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric impact drills, concrete vibrators, and electric planers. The electric equipment is not particularly limited in embodiment 2 of the present application.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should understand that the embodiments as a whole may be combined as appropriate to form other embodiments understood by those skilled in the art.

Variations and modifications to the above-described embodiments may become apparent to those skilled in the art from the disclosure and teachings of the above description. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious modifications, replacements or variations made by those skilled in the art on the basis of the present invention belong to the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims

1. A cylindrical battery, comprising:

the shell (1), the said shell (1) has open tubular structure;

the battery cell (2) is arranged in the shell (1), the battery cell (2) comprises a main body part and a first lug, and the first lug is arranged on one side of the main body part;

a cover plate component (3), wherein the cover plate component (3) covers the opening and is connected with the shell (1) in a sealing mode;

the cover plate assembly (3) comprises a cover plate (31) and a first current collecting member (32), the cover plate (31) is electrically connected with the first pole lug through the first current collecting member (32), and the cover plate (31) is fixedly connected with the shell (1) through welding.

2. A cylindrical battery as defined in claim 1, wherein: the thickness ratio of the cover plate (31) to the shell (1) is 1.0 to 1.5.

3. A cylindrical battery according to claim 1, wherein: the welding penetration of the cover plate (31) and the shell (1) is 0.2mm to 0.8mm.

4. A cylindrical battery according to claim 1, wherein: the battery cell (2) comprises a second pole lug with the polarity opposite to that of the first pole lug, and the second pole lug is positioned on the other side of the main body part of the battery cell (2).

5. A cylindrical battery according to claim 4, wherein: the secondary current collecting component (4) is further included, and the secondary tab is electrically connected with the secondary current collecting component (4).

6. A cylindrical battery according to claim 5, wherein: the novel battery pack is characterized by further comprising a pole (5), wherein a pole leading-out hole is formed in the bottom wall of the shell (1), the pole (5) penetrates through the pole leading-out hole, one end of the pole (5) is used for being connected with an external circuit, and the other end of the pole (5) is used for being connected with the second current collecting component (4).

7. A cylindrical battery as defined in claim 2, wherein: the first current collecting component (32) comprises a disc body (321), a connecting piece (322) and a tail body (323), the connecting piece (322) is formed by bending the tail body (323) along the connecting position of the tail body (323) and the disc body (321) towards the direction close to the disc body (321), and the disc body (321) is used for being connected with a first tab.

8. A cylindrical battery according to claim 7, wherein: the tray body (321), the connecting sheet (322) and the tail body (323) are integrally formed.

9. A cylindrical battery according to claim 7, wherein: an arc-shaped or annular welding part is arranged between the cover plate (31) and the tail body (323), and the ratio of the inner diameter of the welding area of the cover plate (31) to the diameter of the cover plate (31) is 15-96%.

10. A cylindrical battery according to claim 5, wherein: the battery also comprises a first insulating piece (6) for insulating the shell (1) from the second pole ear of the battery cell (2).

11. A cylindrical battery as defined in claim 10, wherein: the first insulating piece (6) comprises a base body (61) and a convex body (62) formed by partially protruding the base body (61) along the axial direction of the base body, the base body (61) is arranged between the second current collecting component (4) and the shell (1), and the convex body (62) is arranged between the battery core (2) and the shell (1).

12. A cylindrical battery according to claim 6, wherein: the pole piece is characterized by further comprising a second insulating piece (7), wherein the second insulating piece (7) is used for insulating the pole piece (5) and the shell (1).

13. An electric device comprising the cylindrical battery according to any one of claims 1 to 12.