CN210092137U

CN210092137U - Lithium battery shell

Info

Publication number: CN210092137U
Application number: CN201920373132.7U
Authority: CN
Inventors: 何光明
Original assignee: SICHUAN SIMEI TECHNOLOGY Co Ltd
Current assignee: Xinjiang SMEI new energy Co., Ltd.
Priority date: 2019-03-22
Filing date: 2019-03-22
Publication date: 2020-02-18
Anticipated expiration: 2029-03-22

Abstract

The utility model belongs to the technical field of battery shells, and discloses a lithium battery shell, which comprises a shell, wherein a cell core is arranged in the shell, second buckles are welded at both ends of the shell, two first buckles are symmetrically sleeved on the shell, the first buckles and the second buckles are both in U-shaped structures, the two first buckles are respectively connected with the two second buckles in a clamping way, a polar cover is arranged in the second buckles, and a sealing ring is arranged between the two second buckles and the polar cover, the utility model is provided with the first buckles and the second buckles, when the integral shell is fixedly connected, the welding position of an end cover is changed by utilizing the clamping of the first buckles and the second buckles, thereby effectively avoiding the contact between a welding point and the polar cover, and simultaneously effectively ensuring the stable connection between the end cover and the shell, thereby reducing the operation difficulty of the whole shell when in connection.

Description

Lithium battery shell

Technical Field

The utility model belongs to the technical field of battery case, concretely relates to lithium battery shell.

Background

The battery shell refers to an external structure for packaging a battery, which is mostly made of materials such as copper or lithium alloy, and the structure of the battery shell is shown in fig. 1, a battery core 4 and two polar caps 5 are both installed on the inner wall of a shell 3, end caps 2 are welded on both sides of the shell 3, a pole 1 penetrates through the middle of the two end caps 2, the pole 1 can be welded on the end caps 2 and can also be welded on the polar caps 5, in the above-mentioned integral structure, the connection between each component is mostly fixed by welding, especially when welding the end caps 2, not only the accuracy of butt joint between the end caps 2 and the shell 3 needs to be ensured, but also the contact between the welding points and the polar caps 5 needs to be avoided, and when recycling the battery of the above-mentioned connection mode, the disassembly and cutting of the end caps 2 still need to be performed by means of high-accuracy equipment, the cost is higher, especially for the battery with a smaller size, the, the operation degree of difficulty is also bigger, in addition, to the connected mode of above-mentioned shell, utmost point post 1 forms all the time through utmost point lid 5 and cell core 4 to be connected, and utmost point post 1 exposes in the air again for a long time, forms the electric field in the minizone around utmost point post 1 for cell core 4 exists certain small electric leakage, and the material of casing 3 itself has certain electric conductivity again simultaneously, thereby makes overall structure's safety protection nature relatively poor.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a lithium battery shell to solve its connection of current battery case and the operation degree of difficulty of dismantling all great, and current battery case's the relatively poor problem of protectiveness to small electric leakage.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a lithium battery shell, includes the casing, the internally mounted of casing has the pond core, the second buckle has all been welded at the both ends of casing, and the symmetrical cover is equipped with two first buckles on the casing, two first buckle and second buckle are U type structure, and two first buckles are connected with two second buckle block respectively, two the polar cap is all installed to the inside of second buckle, and all is provided with the sealing ring between two second buckles and the polar cap, two the one end that the casing was kept away from to the second buckle all is connected with the end cover, two the outer wall of end cover welds with the inner wall of two first buckles respectively, and the intermediate position department of two end covers all runs through there is utmost point post, two the one end of utmost point post is connected with two polar caps respectively.

Preferably, the cross-sectional shape of sealing ring is L shape, and the inner chamber has been seted up to the inside of sealing ring, the inside packing of inner chamber has the activity filler, and the inner chamber comprises radial half chamber and axial half chamber jointly, radial half chamber and axial half chamber are connected perpendicularly, and radial half chamber and axial half chamber's direction is the same with radial and axial direction of polar cap respectively.

Preferably, two all the cover is equipped with the sealed lantern ring on the utmost point post, the sealed lantern ring is fixed in on one side outer wall of end cover.

Preferably, two utmost point post comprises first insulating cover, second insulating cover and conductive sleeve jointly, the conductive sleeve is fixed in between first insulating cover and the second insulating cover, and the internally mounted of conductive sleeve has conductive piston, conductive stud and insulating piston have been welded respectively at conductive piston's both ends, conductive stud closes with first insulating cover through the screw and is connected soon.

Preferably, a positioning knob is welded at the movable end of the insulating piston, and the positioning knob is of a straight-line structure.

Compared with the prior art, the utility model, following beneficial effect has:

(1) the utility model is provided with the first retaining ring and the second retaining ring, when the connection and fixation of the whole shell are carried out, the welding position of the end cover is changed by utilizing the clamping of the first retaining ring and the second retaining ring, thereby effectively avoiding the contact between the welding point and the polar cap, and simultaneously effectively ensuring that the stable connection can still be formed between the end cover and the shell, thereby reducing the operation difficulty of the whole shell when in connection;

in addition, when the shell of the middle structure is disassembled, the cutting equipment is used for cutting the first retaining ring along the axial direction of the shell, so that the separation between the first retaining ring and the second retaining ring is realized, the disassembling operation of the end cover and the shell is completed, and in the integral disassembling process, the cutting equipment is parallel to the cell core, even if the cutting precision is poor, the cell core cannot be damaged, the disassembling difficulty of the integral shell is effectively reduced, and the production and recovery cost of the corresponding battery is reduced to a certain extent.

(2) The utility model discloses the sealing ring has been set up, the sealing ring is installed between polar cap and second buckle to it has movable filler to fill in the inner chamber of sealing ring, when carrying out the fixed of end cover, the end cover causes the extrusion to radial half chamber on the sealing ring, thereby makes the activity filler of radial half intracavity remove to axial half chamber, makes the sealing ring of this part produce the inflation, thereby forms interference fit between messenger's polar cap and the second buckle, has improved the stability when polar cap is fixed greatly.

(3) The utility model discloses the first insulation cover has been set up, insulating cover of second and conductive sleeve, the first insulation cover, the common combination of insulating cover of second and conductive sleeve forms utmost point post, and each structural correspondence is connected with conductive double-screw bolt, conductive piston and insulating piston isotructure, conductive double-screw bolt closes with screwing of first insulation cover, can effectively realize separation or being connected between conductive double-screw bolt and the utmost point lid, thereby make and form the separation or switch on between pond core and the utmost point post, avoid utmost point post to expose and cause the small discharge of pond core on the one hand, on the other hand guarantees effectively switching on when using, in addition, conductive piston and insulating piston homoenergetic form the inside sealed of utmost point post, thereby effectively avoid forming the contact between utmost point lid and the air, the protective effect of whole shell structure to small discharge has been improved greatly, make battery case's use safer.

Drawings

FIG. 1 is a schematic structural diagram of a conventional battery;

FIG. 2 is a schematic structural view of the present invention;

FIG. 3 is an enlarged view of the point A of the present invention;

FIG. 4 is an enlarged view of the point B of the present invention;

fig. 5 is a side view of the insulating piston of the present invention;

in the figure: 1-pole, 2-end cover, 3-shell, 4-cell core, 5-pole cover, 6-first snap ring, 7-sealing collar, 8-second snap ring, 9-sealing ring, 10-radial half cavity, 11-inner cavity, 12-axial half cavity, 13-movable filler, 14-conductive stud, 15-first insulating sleeve, 16-conductive piston, 17-insulating piston, 18-second insulating sleeve, 19-conductive sleeve and 20-positioning knob.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 2-5, the present invention provides the following technical solutions: a lithium battery shell comprises a shell 3, a cell core 4 is installed inside the shell 3, second buckles 8 are welded at two ends of the shell 3, two first buckles 6 are symmetrically sleeved on the shell 3, the two first buckles 6 and the second buckle 8 are of U-shaped structures, the two first buckles 6 are respectively connected with the two second buckles 8 in a clamping manner, the welding position of an end cover 2 is effectively changed by matching the first buckles 6 and the second buckles 8, so that a welding point is prevented from contacting with an electrode cover 5, meanwhile, the end cover 2 and the shell 3 can still form stable connection through clamping and acting, the electrode cover 5 is installed inside the two second buckles 8, a sealing ring 9 is arranged between the two second buckles 8 and the electrode cover 5, an end cover 2 is connected at one end of the two second buckles 8 far away from the shell 3, the outer walls of the two end covers 2 are respectively welded with the inner walls of the two first buckles 6, and the middle positions of the two end covers 2 are all penetrated with the polar posts 1, and one ends of the two polar posts 1 are respectively connected with the two polar covers 5.

In order to improve the stability of the installation of the pole cover 5, in this embodiment, preferably, the cross-sectional shape of the sealing ring 9 is L-shaped, an inner cavity 11 is formed in the sealing ring 9, a movable filler 13 is filled in the inner cavity 11, the movable filler 13 may be gas, liquid or ball, and the like, only it needs to be ensured that when the inner cavity 11 is extruded, the movable filler 13 can automatically move to a part which is not extruded, and the inner cavity 11 is composed of a radial half cavity 10 and an axial half cavity 12, the radial half cavity 10 and the axial half cavity 12 are vertically connected, and the directions of the radial half cavity 10 and the axial half cavity 12 are respectively the same as the radial and axial directions of the pole cover 5.

In order to improve the seal box of utmost point post 1, in this embodiment, preferably, all overlap on two utmost point posts 1 and be equipped with the sealing lantern ring 7, on the sealing lantern ring 7 was fixed in the one side outer wall of end cover 2, the fixed mode of sealing lantern ring 7 can adopt bonding or bolt fastening.

In order to realize the separation between utmost point post 1 and the polar cap 5, in this embodiment, preferably, two utmost point posts 1 constitute by first insulating cover 15, second insulating cover 18 and conducting sleeve 19 jointly, conducting sleeve 19 is fixed in between first insulating cover 15 and the second insulating cover 18, connection slot has been seted up on the outer wall of conducting sleeve 19, form indicating action on the one hand, the stability of wiring when on the other hand guarantees the battery and uses, and the internally mounted of conducting sleeve 19 has conductive piston 16, conductive piston 16's both ends have welded conductive stud 14 and insulating piston 17 respectively, conductive stud 14 closes with first insulating cover 15 through the screw and is connected soon.

In order to facilitate the rotation of the insulating piston 17, in the present embodiment, it is preferable that a positioning knob 20 is welded to the movable end of the insulating piston 17, and the positioning knob 20 has a straight-line structure.

The utility model discloses a theory of operation and use flow: when the battery shell is mounted, the steps are as follows;

firstly, forming parts such as an end cover 2, a shell 3, a polar cover 5, a first retaining ring 6, a second retaining ring 8 and the like by using corresponding dies;

welding a second retaining ring 8 at one end of the shell 3, then symmetrically sleeving two first retaining rings 6 from the other end of the shell 3, ensuring that the first retaining rings 6 and the second retaining rings 8 can form clamping, and then welding a second retaining ring 8 at the other end of the shell 3;

step three, installing the pool core 4 in the shell 3, installing the polar covers 5 at two ends of the pool core 4, and sleeving the sealing ring 9 on the outer wall of the polar cover 5 when the polar cover 5 is installed, so that the sealing ring 9 is embedded between the polar cover 5 and the second retaining ring 8;

welding the pole 1 at the middle position of the end cover 2, sleeving a sealing lantern ring 7 on the pole 1, and fixing by using connecting glue or bolts;

fifthly, fixing end covers 2 with the pole posts 1 at two ends of the integral structure, forcibly extruding the end covers 2 and the first retaining rings 6 to enable the end covers 2 and the second retaining rings 8 to be in tight connection, and then welding the end covers 2 and the first retaining rings 6 by using welding equipment to complete the fixation of the integral battery shell;

as the end cover 2 and the second retaining ring 8 approach each other, the radial half cavity 10 in the sealing ring 9 is squeezed, so that the movable filler 13 in the radial half cavity 10 flows into the axial half cavity 12, and the part of the sealing ring 9 between the pole cover 5 and the second retaining ring 8 expands, thereby forming an interference fit to improve the stability of the installation of the pole cover 5;

when the shell structure is matched with the cell core 4 for use, the terminal 1 needs to be correspondingly adjusted to form the effective use of the whole cell, when the fixation is completed and the cell is not used (as shown in fig. 4), the conductive stud 14 is positioned in the first insulating sleeve 15 and separated from the polar cover 5, so that the whole terminal 1 is not in conductive connection with the polar cover 5, at the moment, even if the terminal 1 is exposed in the air, the phenomenon of micro discharge of the cell core 4 can be avoided, when the shell structure is required to be used, the positioning knob 20 at one end of the insulating piston 17 is held, the insulating piston 17 is rotated, so that the conductive stud 14 is gradually in contact with the polar cover 5 under the action of screwing movement, and the conductive piston 16 is always in contact with the conductive sleeve 19 in the whole process, so as to ensure that the terminal 1 can form a conductive state, and the terminal can be connected with a load by utilizing a connecting clamping groove on the outer wall of the conductive sleeve 19, not only can the protection effect of micro discharge be formed, but also the effective discharge of the whole battery can be ensured;

in addition, when the shell structure is disassembled, the first retaining ring 6 is cut along the axial direction of the shell 3 by using the cutting equipment, and after the first retaining ring 6 is damaged, the connecting structure between the end cover 2 and the shell 3 is also out of limit, so that the separation between the end cover 2 and the shell 3 is effectively formed, and when the cutting equipment is parallel to the cell core 4, the cell core 4 cannot be damaged even if the cutting precision is poor, and the disassembling difficulty of the whole shell is effectively reduced.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A lithium battery shell, includes casing (3), the internally mounted of casing (3) has core (4), its characterized in that: the two ends of the shell (3) are respectively welded with a second retaining ring (8), two first retaining rings (6) are symmetrically sleeved on the shell (3), the two first retaining rings (6) and the second retaining rings (8) are both U-shaped structures, the two first snap rings (6) are respectively connected with the two second snap rings (8) in a clamping way, the two second snap rings (8) are internally provided with the polar covers (5), sealing rings (9) are arranged between the two second retaining rings (8) and the polar cover (5), the end covers (2) are connected to the ends, far away from the shell (3), of the two second retaining rings (8), the outer walls of the two end covers (2) are respectively welded with the inner walls of the two first retaining rings (6), and the middle positions of the two end covers (2) are all penetrated with the polar posts (1), and one ends of the two polar posts (1) are respectively connected with the two polar covers (5).

2. The lithium battery cell casing of claim 1, wherein: the cross-sectional shape of sealing ring (9) is L shape, and inner chamber (11) have been seted up to the inside of sealing ring (9), the inside packing of inner chamber (11) has activity filler (13), and inner chamber (11) comprises radial half chamber (10) and axial half chamber (12) jointly, radial half chamber (10) and axial half chamber (12) are connected perpendicularly, and the direction of radial half chamber (10) and axial half chamber (12) is the same with radial and axial direction of utmost point lid (5) respectively.

3. The lithium battery cell casing of claim 1, wherein: two all the cover is equipped with sealed lantern ring (7) on utmost point post (1), sealed lantern ring (7) are fixed in on one side outer wall of end cover (2).

4. A lithium battery cell casing according to claim 3, characterized in that: two utmost point post (1) comprises first insulating cover (15), second insulating cover (18) and conductive sleeve (19) jointly, conductive sleeve (19) are fixed in between first insulating cover (15) and second insulating cover (18), and the internally mounted of conductive sleeve (19) has conductive piston (16), conductive stud (14) and insulating piston (17) have been welded respectively at the both ends of conductive piston (16), conductive stud (14) close with first insulating cover (15) through the screw thread and are connected soon.

5. The lithium battery cell casing of claim 4, wherein: the movable end welding of insulating piston (17) has location knob (20), location knob (20) are the style of calligraphy structure.