CN216958182U

CN216958182U - Lithium battery formation device

Info

Publication number: CN216958182U
Application number: CN202220391664.5U
Authority: CN
Inventors: 安敏俊; 薄晋科; 李猛; 王东; 冯建伟; 张良; 曹仕良
Original assignee: Dalian CBAK Power Battery Co Ltd
Current assignee: Dalian CBAK Power Battery Co Ltd
Priority date: 2022-02-25
Filing date: 2022-02-25
Publication date: 2022-07-12
Anticipated expiration: 2032-02-25

Abstract

The utility model relates to the technical field of lithium battery production, and provides a lithium battery formation device, which comprises: a base and a top cover; a plurality of accommodating grooves are concavely arranged on the mounting surface of the base and are arranged at intervals; the accommodating tank is used for installing a steel shell of the lithium battery, a winding core is arranged in the steel shell, and the steel shell is provided with an opening; the depth of the accommodating groove is smaller than the height of the steel shell; a negative probe is arranged at the bottom of the accommodating groove and is electrically connected with the steel shell; one end of the base, which is close to the mounting surface, extends into the top cover, one side of the top cover, which is close to the mounting surface, is provided with a plurality of anode probes, the plurality of anode probes and the plurality of accommodating grooves are arranged in a one-to-one correspondence manner, and the anode probes are used for being electrically connected with the anode lugs of the winding core; a vacuum cavity is enclosed between the mounting surface and the top cover and is communicated with the opening, and the vacuum cavity is communicated with a vacuum pump; the negative probe and the positive probe are electrically connected with the charging equipment; the utility model can realize the opening formation of the lithium battery steel shell and improve the quality of the lithium battery.

Description

Lithium battery formation device

Technical Field

The utility model relates to the technical field of lithium battery production, in particular to a lithium battery formation device.

Background

The formation process of the lithium battery is to perform one-time charging operation on the lithium battery after the lithium battery is produced, and aims to activate active substances in the lithium battery so that the lithium battery can be normally charged and discharged in the subsequent use process.

The conventional lithium battery formation process is carried out after the shell of the lithium battery is sealed, and a certain amount of gas can be generated in the formation process, so that the defect that the gas in the lithium battery cannot be discharged out of the shell is caused, and the lithium battery is easy to lose efficacy in subsequent electrical property tests, safety tests and use processes.

SUMMERY OF THE UTILITY MODEL

The utility model provides a lithium battery formation device, which is used for solving or improving the problem that gas generated in the formation process cannot be discharged out of a shell when the conventional lithium battery is formed under the condition that the shell is sealed.

The utility model provides a lithium battery formation device, which comprises: a base and a top cover; a plurality of accommodating grooves are concavely arranged on the mounting surface of the base and are arranged at intervals; the accommodating groove is used for installing a steel shell of the lithium battery, a winding core is arranged in the steel shell, and the steel shell is provided with an opening; the depth of the accommodating groove is smaller than the height of the steel shell; a negative probe is arranged at the bottom of the accommodating groove and is electrically connected with the steel shell; one end, close to the mounting surface, of the base extends into the top cover, one side, close to the mounting surface, of the top cover is provided with a plurality of anode probes, the plurality of anode probes and the plurality of accommodating grooves are arranged in a one-to-one correspondence mode, and the anode probes are used for being electrically connected with anode lugs of the winding core; a vacuum cavity is defined between the mounting surface and the top cover and is communicated with the opening, and the vacuum cavity is communicated with a vacuum pump; the negative electrode probe and the positive electrode probe are used for being electrically connected with charging equipment.

According to the lithium battery formation device provided by the utility model, the lithium battery formation device further comprises: an insulating member; the insulating part is in a round table shape, the insulating part is provided with a first end face and a second end face which are opposite, the first end face is concavely provided with a first groove, the second end face is concavely provided with a second groove, and the first groove is communicated with the second groove; the steel shell deviates from one end of the accommodating groove and is used for extending into the first groove, and the second groove is used for allowing the positive lug of the winding core to penetrate through.

According to the lithium battery formation device provided by the utility model, the projection shape of the steel shell on the mounting surface is circular; the projection shape of the first groove on the first end face is circular, and the projection shape of the second groove on the second end face is rectangular.

According to the lithium battery formation device provided by the utility model, the top cover is provided with the vacuum valve and the pressure release valve; one end of the vacuum valve is communicated with the vacuum cavity, and the other end of the vacuum valve is communicated with the vacuum pump; the pressure relief valve is communicated with the vacuum cavity.

According to the lithium battery formation device provided by the utility model, the base comprises: a base body and a tray; the accommodating groove extends from one end of the base body to the other end of the base body, and the other end of the base body is connected with the end face of the tray; the negative probe is arranged on the end face of the tray.

According to the lithium battery formation device provided by the utility model, the top cover comprises: the top cover comprises a top cover body, a first side wall, a second side wall, a third side wall and a fourth side wall; one end of the first side wall is connected with one end of the second side wall, the other end of the second side wall is connected with one end of the third side wall, the other end of the third side wall is connected with one end of the fourth side wall, and the other end of the fourth side wall is connected with the other end of the first side wall; the first side wall, the second side wall, the third side wall and the fourth side wall are respectively connected with the top cover body; the first side wall, the second side wall, the third side wall, the fourth side wall, the top cover body and the mounting surface enclose the vacuum cavity.

According to the lithium battery formation device provided by the utility model, the thicknesses of the first side wall, the second side wall, the third side wall and the fourth side wall are all equal.

According to the lithium battery formation device provided by the utility model, one end of the top cover close to the base is flush with one end of the base, which is far away from the mounting surface.

According to the lithium battery formation device provided by the utility model, the projection shape of the accommodating groove on the mounting surface is circular.

According to the lithium battery formation device provided by the utility model, the projection shape of the base on the plane where the mounting surface is located is rectangular.

The utility model provides a lithium battery formation device, which is characterized in that a base and a top cover are arranged, after a winding core is arranged in a steel shell, the opening of the steel shell is not sealed, a positive lug of the winding core extends out of the opening, the steel shell is placed in a containing tank, the steel shell is used as a negative electrode of a lithium battery and is electrically connected with a negative probe in the containing tank, because the depth of the containing tank is less than the height of the steel shell, one end of the steel shell, which is far away from the containing tank, can be exposed out of the containing tank, the top cover is covered towards the base along the direction vertical to an installation surface, so that the installation surface extends into the top cover until the positive probe in the top cover is abutted against the positive lug of the winding core, so that the positive probe is electrically connected with the positive lug of the winding core, a certain gap is arranged between the installation surface and the top cover, a sealed vacuum cavity is enclosed between the installation surface and the top cover, gas in the vacuum cavity is pumped by a vacuum pump, so that negative pressure is formed in the vacuum cavity, and the base and the top cover can be tightly attached under the action of the negative pressure, the method comprises the steps that the negative probe is in full contact with a steel shell, the positive probe is in full contact with a positive lug, in the process that the charging equipment performs formation on the lithium battery through the negative probe and the positive probe, generated gas can enter a vacuum cavity through an opening of the steel shell, after a base is separated from a top cover, the gas is discharged into the atmosphere, so that the formation of the opening of the lithium battery is achieved, after the formation of the lithium battery is finished, the top cover is separated from the base, the steel shell is taken out of a containing groove, and then the opening of the steel shell is sealed; this embodiment is through carrying out the opening formation to the lithium cell, avoids the lithium cell to appear the unable outer defect of steel casing of discharging of the gas that produces in the formation process, has promoted the quality of lithium cell.

Drawings

In order to more clearly illustrate the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is an exploded schematic view of a lithium battery formation device provided by the present invention;

FIG. 2 is a schematic structural diagram of a lithium battery formation device provided by the present invention;

FIG. 3 is a schematic view of the structure of the insulator provided by the present invention;

reference numerals:

1: a base; 11: accommodating grooves; 12: a negative probe; 13: a base body; 14: a tray; 2: a top cover; 21: a positive electrode probe; 22: a top cover body; 23: a first side wall; 24: a second side wall; 25: a third side wall; 26: a fourth side wall; 3: a steel shell; 4: a positive tab; 5: a vacuum chamber; 6: an insulating member; 61: a first groove; 62: a second groove; 7: a vacuum valve; 8: and (4) releasing the valve.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present invention, it should be noted that the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection, unless explicitly stated or limited otherwise; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.

The lithium battery formation device provided by the utility model is described below with reference to fig. 1 to 3.

As shown in fig. 1 to 2, the lithium battery formation device of the present embodiment includes: a base 1 and a top cover 2; a plurality of accommodating grooves 11 are concavely arranged on the mounting surface of the base 1, and the accommodating grooves 11 are arranged at intervals; the accommodating groove 11 is used for installing a steel shell 3 of the lithium battery, a winding core is arranged in the steel shell 3, and the steel shell 3 is provided with an opening; the depth of the accommodating groove 11 is less than the height of the steel shell 3; a negative probe 12 is arranged at the bottom of the accommodating groove 11, and the negative probe 12 is electrically connected with the steel shell 3; one end of the base 1, which is close to the mounting surface, extends into the top cover 2, one side of the top cover 2, which is close to the mounting surface, is provided with a plurality of anode probes 21, the plurality of anode probes 21 and the plurality of accommodating grooves 11 are arranged in a one-to-one correspondence manner, and the anode probes 21 are used for being electrically connected with the anode lug 4 of the winding core; a vacuum cavity 5 is defined between the mounting surface and the top cover 2, the vacuum cavity 5 is communicated with the opening, and the vacuum cavity 5 is used for being communicated with a vacuum pump; the negative electrode probe 12 and the positive electrode probe 21 are used for electrically connecting with a charging device.

Specifically, in the lithium battery formation device shown in this embodiment, by providing the base 1 and the top cover 2, after the winding core is installed in the steel shell 3, at this time, the opening of the steel shell 3 is not closed, the positive electrode tab 4 of the winding core extends out of the opening, the steel shell 3 is placed in the accommodating groove 11, the steel shell 3 is used as the negative electrode of the lithium battery and electrically connected with the negative electrode probe 12 in the accommodating groove 11, since the depth of the accommodating groove 11 is less than the height of the steel shell 3, one end of the steel shell 3 departing from the accommodating groove 11 can be exposed out of the accommodating groove 11, the top cover 2 is covered towards the base 1 along the direction perpendicular to the mounting surface, so that the mounting surface extends into the top cover 2 until the positive electrode probe 21 in the top cover 2 abuts against the positive electrode tab 4 of the winding core, thereby realizing that the positive electrode probe 21 is electrically connected with the positive electrode tab 4 of the winding core, at this time, a certain gap is provided between the mounting surface and the top cover 2, a closed vacuum cavity 5 is defined between the mounting surface and the top cover 2, the gas in the vacuum cavity 5 is extracted through a vacuum pump, so that negative pressure is formed in the vacuum cavity 5, the base 1 and the top cover 2 can be tightly attached under the action of the negative pressure, the negative probe 12 is fully contacted with the steel shell 3, the positive probe 21 is fully contacted with the positive lug 4, in the process that the charging equipment forms the lithium battery through the negative probe 12 and the positive probe 21, the generated gas can enter the vacuum cavity 5 through the opening of the steel shell 3, after the base 1 is separated from the top cover 2, the gas is discharged into the atmosphere, so that the open formation of the lithium battery is realized, after the formation of the lithium battery is finished, the top cover 2 is separated from the base 1, the steel shell 3 is taken out of the accommodating groove 11, and then the opening of the steel shell 3 is sealed; this embodiment is through carrying out the opening formation to the lithium cell, avoids the lithium cell to appear the unable defect outside 3 steel casings of discharging of gas that produce in the formation process, has promoted the quality of lithium cell.

In some embodiments, as shown in fig. 2 and fig. 3, the lithium battery formation device shown in the present embodiment further includes: an insulating member 6; the insulating part 6 is in a circular truncated cone shape, the insulating part 6 is provided with a first end face and a second end face which are opposite, the first end face is concavely provided with a first groove 61, the second end face is concavely provided with a second groove 62, and the first groove 61 is communicated with the second groove 62; the end of the steel shell 3 departing from the accommodating groove 11 is used for extending into the first groove 61, and the second groove 62 is used for the positive lug 4 of the winding core to pass through.

Specifically, the shown box hat 3 of this embodiment installs the back that targets in place in holding tank 11, overlap insulator 6 in the one end that box hat 3 deviates from holding tank 11, first recess 61 is connected with box hat 3, the anodal ear 4 of book core passes first recess 61 and second recess 62 in proper order, second recess 62 can be adjusted well utmost point ear 4 and play the effect of fixed stay, so that anodal ear 4 can fully contact with anodal probe 21, meanwhile, insulator 6 can prevent the short circuit that anodal probe 21 and box hat 3 contact caused, thereby the stability of formation process has been promoted, wherein, the material of insulator 6 is rubber.

In some embodiments, as shown in fig. 3, the projection shape of the steel shell 3 on the installation surface is circular in the embodiment; the first grooves 61 have a circular projection shape on the first end face, and the second grooves 62 have a rectangular projection shape on the second end face.

Specifically, the steel shell 3 shown in the embodiment is cylindrical, and accordingly, the first groove 61 is adapted to the shape of the steel shell 3, and the cross-sectional shape of the first groove 61 is circular, so that the steel shell 3 can be embedded into the first groove 61; the cross sectional shape of anodal ear 4 is the rectangle, and correspondingly, second recess 62 and anodal ear 4's shape looks adaptation, and then the cross sectional shape of second recess 62 is the rectangle, and on the one hand, anodal ear 4 can pass second recess 62, and on the other hand, the lateral wall of second recess 62 can play the spacing effect of support to anodal ear 4 to guarantee anodal ear 4 and anodal probe 21's stable contact.

In some embodiments, as shown in fig. 1 and fig. 2, a vacuum valve 7 and a pressure relief valve 8 are provided on the top cover 2 shown in this embodiment; one end of the vacuum valve 7 is communicated with the vacuum cavity 5, and the other end of the vacuum valve 7 is communicated with the vacuum pump; the pressure release valve 8 communicates with the vacuum chamber 5.

Specifically, after the top cover 2 is covered on the base 1, the vacuum valve 7 is opened and the pressure release valve 8 is closed, and the vacuum pump is used for pumping out the gas in the vacuum cavity 5 to form negative pressure in the vacuum cavity 5, so that the base 1 and the top cover 2 are tightly attached; treat that lithium cellization becomes to accomplish the back, open relief valve 8, the air can get into in vacuum cavity 5 through relief valve 8 to operating personnel separates top cap 2 and base 1.

In some embodiments, as shown in fig. 1 and 2, the base 1 shown in the present embodiment includes a base body 13 and a tray 14; the accommodating groove 11 extends from one end of the base body 13 to the other end of the base body 13, the other end of the base body 13 is connected with the end face of the tray 14, and the negative electrode probe 12 is arranged on the end face of the tray 14.

Specifically, the accommodating groove 11 shown in this embodiment penetrates through the base body 13, and after the steel shell 3 is placed in the accommodating groove 11, the tray 14 can hold the bottom of the steel shell 3, and meanwhile, the negative probe 12 on the tray 14 abuts against the steel shell 3.

In some embodiments, as shown in fig. 1, the top cover 2 of the present embodiment includes: a top cover body 22, a first sidewall 23, a second sidewall 24, a third sidewall 25, and a fourth sidewall 26; one end of the first sidewall 23 is connected to one end of the second sidewall 24, the other end of the second sidewall 24 is connected to one end of the third sidewall 25, the other end of the third sidewall 25 is connected to one end of the fourth sidewall 26, and the other end of the fourth sidewall 26 is connected to the other end of the first sidewall 23; the first side wall 23, the second side wall 24, the third side wall 25 and the fourth side wall 26 are respectively connected with the top cover body 22; the first side wall 23, the second side wall 24, the third side wall 25, the fourth side wall 26, the top cover body 22 and the mounting surface enclose a vacuum chamber.

Specifically, the first side wall 23, the second side wall 24, the third side wall 25 and the fourth side wall 26 are respectively attached to the outer side wall of the base 1, the first side wall 23, the second side wall 24, the third side wall 25, the fourth side wall 26, the top cover body 22 and the mounting surface jointly enclose a cuboid-shaped vacuum cavity 5, and gas generated in the lithium battery formation process enters the vacuum cavity 5 through an opening in the steel shell 3 so as to avoid the defect that gas remains in the steel shell 3 after the lithium battery formation is completed.

In some embodiments, as shown in fig. 1, the thicknesses of the first sidewall 23, the second sidewall 24, the third sidewall 25, and the fourth sidewall 26 of the present embodiment are all equal.

Specifically, the length of the top cover 2 shown in the present embodiment is the sum of the lengths of the first side wall 23, the third side wall 25 and the base 1, and the width of the top cover 2 is the sum of the widths of the second side wall 24, the fourth side wall 26 and the base 1.

In some embodiments, as shown in fig. 2, the end of the top cover 2 near the base 1 is flush with the end of the base 1 away from the mounting surface.

Specifically, the base 1 shown in the present embodiment can be completely embedded in the top cover 2, and the bottom surface of the base 1 is flush with the lower end surface of the top cover 2.

In some embodiments, as shown in fig. 1, the projection shape of the receiving groove 11 on the mounting surface is circular.

Specifically, the steel shell 3 shown in this embodiment is cylindrical, and accordingly, the accommodating groove 11 is adapted to the shape of the steel shell 3, and the accommodating groove 11 is cylindrical.

In some embodiments, as shown in fig. 1, the projection shape of the base 1 shown in the present embodiment on the plane of the installation surface is a rectangle.

Specifically, the base 1 shown in the present embodiment has a rectangular parallelepiped shape, and accordingly, the top cover 2 has a rectangular parallelepiped shape, and the outer side wall of the base 1 can be bonded to the inner side wall of the top cover 2.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A lithium battery formation device, comprising:

the mounting surface of the base is concavely provided with a plurality of accommodating grooves which are arranged at intervals; the accommodating groove is used for installing a steel shell of the lithium battery, a winding core is arranged in the steel shell, and the steel shell is provided with an opening; the depth of the accommodating groove is smaller than the height of the steel shell; a negative probe is arranged at the bottom of the accommodating groove and is electrically connected with the steel shell;

the end, close to the mounting surface, of the base extends into the top cover, one side, close to the mounting surface, of the top cover is provided with a plurality of anode probes, the plurality of anode probes and the plurality of accommodating grooves are arranged in a one-to-one correspondence mode, and the anode probes are used for being electrically connected with anode lugs of the winding core; a vacuum cavity is defined between the mounting surface and the top cover and is communicated with the opening, and the vacuum cavity is communicated with a vacuum pump;

the negative electrode probe and the positive electrode probe are used for being electrically connected with charging equipment.

2. The lithium battery formation apparatus of claim 1,

the lithium battery formation device further comprises: an insulating member;

the insulating part is in a round table shape, the insulating part is provided with a first end face and a second end face which are opposite, the first end face is concavely provided with a first groove, the second end face is concavely provided with a second groove, and the first groove is communicated with the second groove;

the steel shell deviates from one end of the accommodating groove and is used for extending into the first groove, and the second groove is used for allowing the positive lug of the winding core to penetrate through.

3. The lithium battery formation device of claim 2,

the projection shape of the steel shell on the mounting surface is circular;

the projection shape of the first groove on the first end face is circular, and the projection shape of the second groove on the second end face is rectangular.

4. The lithium battery formation apparatus of claim 1,

the top cover is provided with a vacuum valve and a pressure release valve;

one end of the vacuum valve is communicated with the vacuum cavity, and the other end of the vacuum valve is communicated with the vacuum pump; the pressure relief valve is communicated with the vacuum cavity.

5. The lithium battery formation apparatus of claim 1,

the base includes: a base body and a tray;

the accommodating groove extends from one end of the base body to the other end of the base body, and the other end of the base body is connected with the end face of the tray; the negative probe is arranged on the end face of the tray.

6. The lithium battery formation apparatus of claim 1,

the top cover includes: the top cover comprises a top cover body, a first side wall, a second side wall, a third side wall and a fourth side wall;

one end of the first side wall is connected with one end of the second side wall, the other end of the second side wall is connected with one end of the third side wall, the other end of the third side wall is connected with one end of the fourth side wall, and the other end of the fourth side wall is connected with the other end of the first side wall; the first side wall, the second side wall, the third side wall and the fourth side wall are respectively connected with the top cover body;

the first side wall, the second side wall, the third side wall, the fourth side wall, the top cover body and the mounting surface enclose the vacuum cavity.

7. The lithium battery formation apparatus of claim 6,

the thicknesses of the first side wall, the second side wall, the third side wall and the fourth side wall are all equal.

8. The lithium battery formation apparatus of claim 1,

the end of the top cover close to the base is flush with the end of the base, which deviates from the mounting surface.

9. The lithium cellization apparatus as recited in any one of claims 1 to 8, characterized in that the projection shape of the housing groove on the mounting surface is a circle.

10. The lithium cellularization device of any one of claims 1 to 8, wherein a projection shape of the base on a plane where the mounting surface is located is a rectangle.