CN217544699U

CN217544699U - Lithium ion battery that can tighten up flows and draws frame

Info

Publication number: CN217544699U
Application number: CN202221496827.2U
Authority: CN
Inventors: 宋丹; 周其鹏; 王永; 吴满堂
Original assignee: Huading Guolian Power Battery Co ltd
Current assignee: Huading Guolian Power Battery Co ltd
Priority date: 2022-06-14
Filing date: 2022-06-14
Publication date: 2022-10-04
Anticipated expiration: 2032-06-14

Abstract

The utility model discloses a tightening lithium ion Chi Liu pull frame, which comprises a frame body, wherein a splint group is arranged in the frame body, and one side of the splint group is provided with a telescopic cylinder capable of compressing the splint group; the splint group includes a plurality of portable splint that set gradually, the equal elastic connection of two arbitrary adjacent portable splint, and all is provided with the wheat bag between two adjacent portable splint, is provided with electric core in the wheat bag. The utility model discloses when self-discharge screening, the telescoping cylinder action compresses tightly electric core completely through portable splint, makes the whole plane atress of electric core, and then makes in-core positive plate, diaphragm and negative pole piece can contact completely, and electric core does not compressed tightly the risk that the interior short circuit electricity core that causes flowed when reducing the self-discharge screening.

Description

Lithium ion battery that can tighten up flows and draws frame

Technical Field

The utility model belongs to the technical field of lithium ion battery, concretely relates to but lithium ion Chi Liu draw frame of tightening up.

Background

The lithium ion soft package battery is widely applied to the field of new energy automobiles by virtue of the advantages of high energy density, flexible design and the like, and the market share of the soft package battery is continuously increased by the support of the state on the new energy lithium ion battery. In recent years, safety problems such as spontaneous combustion of electric vehicles have attracted much attention. It is well known that the higher the capacity density, the higher the safety requirements of lithium batteries. The internal short circuit is an important factor of potential safety hazard of the lithium ion battery. The presence of an internal short circuit presents a significant safety risk and may lead to fires, explosions, etc. An important feature of the internal short circuit that is present in a battery is that the self-discharge is large, and therefore any battery that has an abnormal self-discharge screening must be screened as early as possible during the manufacturing process. There are many potential risks of internal short circuits in the design and manufacturing process of the cell, and therefore necessary measures must be taken to prevent the cell from internal short circuits in abnormal situations at these critical locations. The process technology of the lithium battery comprises the processes of homogenizing, coating, die cutting, slitting, baking, laminating, welding, heat sealing, injecting, pre-charging, degas, constant volume and the like. The internal short circuit in the manufacturing process mainly comprises two aspects, namely metal foreign matters in the manufacturing process and diaphragm folds in the lamination process, so that the positive electrode and the negative electrode cannot be separated by the diaphragm, and the possibility of contact exists between the positive electrode and the negative electrode. For the diaphragm fold problem, after the lamination is completed, insulation test can be performed, namely if the diaphragm fold is serious, and the diaphragm cannot cover the negative electrode, the positive and negative plates can be in direct contact after being compressed by a pressing plate in the insulation test process, so that the insulation test is unqualified. However, due to the existence of factors such as a thinning area and not too large edge pressing pressure, when the diaphragm folds to cause that the diaphragm cannot cover the negative electrode, and the black leakage width is less than 2mm, but the fold part may not be completely compressed during testing, so that the positive and negative pole pieces are not in direct contact during testing, and therefore the insulation equipment is qualified by misjudgment, and the outflow risk exists. After the battery core that the lamination was accomplished welds, also can carry out insulation test, but because the battery core after the welding, when insulation test, the clamp plate can not cover the battery core completely, has 1cm apart from the pole piece edge and does not have the clamp plate, consequently such test also can't be with the diaphragm fold, leaks black width and is less than 2 mm's unusual discernment. At present, the internal short circuit identification is mainly performed through self-discharge screening, a battery core is transported and placed in a static state through a flow rotating frame, but the whole surface of the battery cannot be compressed by the flow rotating frame used at present, so that during self-discharge screening, the battery core is not compressed, risks of internal short circuit possibly generated cannot be identified, outflow risks exist, and after loading, safety problems of internal short circuit and the like caused by contact of positive and negative pole pieces possibly generated due to factors such as jolt in driving and the like can be solved.

In order to solve the above technical problems, some prior arts exist, and the specific solutions of the prior arts are as follows:

current circulation frame is adjustable fixed clearance's guide pillar type frame core, and the electric core unloading is put to the manipulator clamp, removes the fixed distance unloading at every turn and puts and get electric core, and the fixed distance between guide pillar and the guide pillar should be the same with the fixed distance that the manipulator removed at every turn to make electric core can place between two guide pillars, vertical placing.

The prior art has the following disadvantages:

the current circulation frame is adjustable fixed gap guide post type frame core, and the guide pillar is fixed after the adjustment is accomplished, and this circulation frame does not have the function of tightening up, when self-discharging screening, only for placing the frame, does not have the function of tightening up, and during self-discharging screening, electric core does not have the atress for positive and negative pole piece, the unable in close contact with of diaphragm, if there is the diaphragm fold, leaks black width and is less than 3 mm's electric core, probably has the outflow risk.

In view of the above, a new technical solution is needed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a but lithium ion Chi Liu of tightening draws frame for when solving to carry out the self-discharge screening among the prior art, because electric core does not compress tightly, the risk of short circuit can't be discerned in some probably production, has the outflow risk, after the loading, because the jolt of going etc. factor, safety problems such as short circuit in probably producing positive and negative pole piece contact and leading to.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a collapsible lithium ion Chi Liu pull frame comprises a frame body, wherein a clamping plate group is installed in the frame body, and one side of the clamping plate group is provided with a telescopic cylinder capable of compressing the clamping plate group; the splint group includes a plurality of portable splint that set gradually, the equal elastic connection of two arbitrary adjacent portable splint, and all is provided with the wheat bag between two adjacent portable splint, is provided with electric core in the wheat bag.

As an in the utility model discloses in an preferred technical scheme, the cylinder body of telescoping cylinder is connected in the one end of frame body, and the telescopic link of telescoping cylinder is connected with adjacent portable splint looks butt.

As an optimized technical scheme in the utility model, every equal sliding connection of portable splint is internal in the frame body.

As an in the utility model discloses in an preferred technical scheme, all be provided with a plurality of springs between two adjacent portable splint, and be provided with wheat between two springs between the portable splint and draw bag installation clearance.

As an in the utility model discloses in an preferred technical scheme, one side of every portable splint orientation adjacent portable splint all is provided with the silica gel pad.

As an optimized technical proposal in the utility model, the thickness of the silica gel pad is 0.5-2mm.

As an in the utility model discloses in an preferred technical scheme, the upper end of every portable splint is the trapezium structure of width from the top down grow gradually.

As an in the utility model discloses in an preferred technical scheme, the telescoping cylinder is cylinder, pneumatic cylinder or electric cylinder.

Has the advantages that: the movable clamping plates can be pressed through the telescopic cylinder, so that the electric core between the two movable clamping plates is pressed, when self-discharge screening is carried out, the electric core is completely pressed through the movable clamping plates by the action of the telescopic cylinder, the whole plane of the electric core is stressed, and further, a positive plate, a diaphragm and a negative plate in the electric core can be completely contacted, and the risk of outflow of an internal short circuit electric core caused by the fact that the electric core is not pressed during self-discharge screening is reduced; and when the telescoping cylinder shrink, then can utilize elastic connection relation automatic re-setting between the portable splint in the splint group, two adjacent portable splints form fixed width, conveniently place electric core in the wheat bag between portable splint, can transport as the circulation frame for whole equipment is simple and practical.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

In the figure: 1-a frame body; 2-a telescopic cylinder; 3-movable clamping plate.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be briefly described below with reference to the accompanying drawings and the description of the embodiments or the prior art, and it is obvious that the following description of the structure of the accompanying drawings is only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without any inventive work. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto.

The first embodiment is as follows:

as shown in fig. 1, the embodiment provides a retractable lithium ion Chi Liu pull frame, which includes a frame body 1, a clamping plate group is installed in the frame body 1, and a telescopic cylinder 2 capable of compressing the clamping plate group is arranged on one side of the clamping plate group; the utility model discloses a portable battery, including the portable splint 3 that set gradually, arbitrary two adjacent portable splint 3 equal elastic connection, when telescoping cylinder 2 extends, can compress tightly splint group, and when telescoping cylinder 2 contracts, then can utilize elastic connection relation automatic re-setting between the portable splint 3 in the splint group, two adjacent portable splint 3 form fixed width, and all be provided with the wheat bag between two adjacent portable splint 3, be provided with electric core in the wheat bag, when screening from discharging, the 2 actions of telescoping cylinder compress tightly electric core through portable splint completely, make the whole plane atress of electric core, and then the interior positive plate of electric core, diaphragm and negative pole piece can contact completely, reduce the risk that the electric core did not compress tightly the interior short circuit electricity core outflow that causes when screening from discharging.

The movable clamping plates 3 in the utility model can be compressed through the telescopic cylinder 2, so that the battery cell between the two movable clamping plates 3 is compressed, when self-discharge screening is carried out, the telescopic cylinder 2 acts to completely compress the battery cell through the movable clamping plates, so that the whole plane of the battery cell is stressed, and further, a positive plate, a diaphragm and a negative plate in the battery cell can be completely contacted, and the risk that the battery cell is not compressed to cause the outflow of an internal short circuit battery cell during self-discharge screening is reduced; and when telescoping cylinder 2 shrink, then can utilize elastic connection relation automatic re-setting between the portable splint 3 in the splint group, two adjacent portable splint 3 form fixed width, conveniently place electric core in the wheat bag between the portable splint, can transport as the circulation frame for whole equipment is simple and practical.

As a preferred embodiment in this embodiment, it should be further described that the cylinder body of the telescopic cylinder 2 is connected to one end of the frame body 1, specifically, the cylinder body may be installed outside the frame body 1, or may be installed inside the frame body 1, when the cylinder body of the telescopic cylinder 2 is installed outside the frame body 1, a through hole is provided on the frame body 1, so that the telescopic rod of the telescopic cylinder 2 passes through the through hole, then the telescopic rod of the telescopic cylinder 2 is abutted or connected to the adjacent movable clamping plate 3, preferably, the telescopic rod of the telescopic cylinder 2 is abutted or connected to the adjacent movable clamping plate 3, no matter whether the abutting or connecting is adopted, the pressing effect of the telescopic cylinder 2 on the movable clamping plate 3 in the clamping plate set can be ensured, but when the telescopic rod of the telescopic cylinder 2 retracts, if the telescopic rod of the telescopic cylinder 2 is abutted to the adjacent movable clamping plate 3, there is no need to worry that the retraction amount of the telescopic rod of the telescopic cylinder 2 is too large, thereby avoiding affecting the elastic connection relationship between the two movable clamping plates 3, and also reducing the connection step when the telescopic rod of the telescopic cylinder 2 is connected to the adjacent movable clamping plate 3, so that the installation of the entire structure is simpler.

As a preferred embodiment in this embodiment, it should be further explained that each movable clamping plate 3 is slidably connected in the frame body 1, for example, two sides of the movable clamping plate 3 are respectively abutted against two inner walls of the frame body 1, and the lower end of the movable clamping plate 3 is abutted against the inner bottom surface of the frame body 1, so that the movable clamping plate 3 can stably slide in the frame body 1 by the constraint; or, on the basis, two limiting columns are arranged in the moving direction of the movable clamping plate 3, and the two limiting columns penetrate through all the movable clamping plates 3, so that the movable clamping plates 3 can stably slide in the frame body 1, and a specific sliding limiting structure is not limited in practice.

As a preferred embodiment in this embodiment, it should be further described that a plurality of springs are disposed between two adjacent movable clamp plates 3, and a mylar bag installation gap is disposed between the springs between the two movable clamp plates 3, when the telescopic cylinder 2 compresses the movable clamp plates 3, the springs compress to generate an elastic force, and when the telescopic cylinder 2 retracts, the elastic force of the springs drives the movable clamp plates 3 to automatically return, so that the structure is simple and practical.

As a preferred embodiment in this embodiment, it needs to be further described that the upper end of each movable clamping plate 3 is a trapezoid structure whose width gradually increases from top to bottom, so that an opening structure is formed at the upper end between two movable clamping plates 3, when a battery cell is placed, the battery cell can easily slide into the space between two movable clamping plates 3 from the uppermost end, and then the placement of the battery cell is easier and more accurate, thereby improving the working efficiency.

As a preferred embodiment in this embodiment, it should be further described that the telescopic cylinder 2 is an air cylinder, a hydraulic cylinder or an electric cylinder, and all of the three are mature prior art, and can realize the telescopic structure, so as to further realize the pressing operation on the movable clamping plate 3.

The second embodiment:

the present embodiment is a further improvement on the basis of the first embodiment, and specific differences between the present embodiment and the first embodiment are:

as a specific implementation scheme in this embodiment, it should be further described that a silica gel pad is disposed on one side of each movable clamping plate 3 facing the adjacent movable clamping plate 3, and the silica gel pad has a certain buffering effect, so that a protection can be formed on the battery cell, and the battery cell structure is prevented from being damaged by too much external force.

As a preferred embodiment in this embodiment, it should be further noted that the thickness of the silicone pad is 0.5-2mm, specifically 0.5cm, 1cm, 1.5cm or 2cm, and the like, and the specific thickness is not limited in this range, because the telescopic cylinder 2 in the present invention does not need too much force, and thus, the required protection effect can be achieved by a very thin silicone pad.

Finally, it should be noted that: the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A contractible lithium ion Chi Liu pull frame is characterized by comprising a frame body (1), wherein a splint group is installed in the frame body (1), and one side of the splint group is provided with a telescopic cylinder (2) capable of compressing the splint group; the utility model discloses a wheat draws bag, including the movable splint (3) that set gradually, splint group is including a plurality of movable splint (3) that set gradually, arbitrary two adjacent equal elastic connection of movable splint (3), and all is provided with the wheat between two adjacent movable splint (3), is provided with electric core in the wheat draws the bag.

2. The retractable lithium ion Chi Liu pulling frame as claimed in claim 1, wherein the cylinder body of the retractable cylinder (2) is connected to one end of the frame body (1), and the retractable rod of the retractable cylinder (2) is abutted or connected with the adjacent movable clamping plate (3).

3. A collapsible li-ion Chi Liu pull frame as in claim 1 or 2 wherein each movable clamp plate (3) is slidably connected within frame body (1).

4. A collapsible lithium ion Chi Liu pulling frame as in claim 3 wherein there are multiple springs between two adjacent moveable clamping plates (3) and there is a Maillard bag installation gap between the springs between two moveable clamping plates (3).

5. The tightening lithium ion Chi Liu pulling frame as claimed in claim 1, wherein one side of each movable clamping plate (3) facing to the adjacent movable clamping plate (3) is provided with a silica gel pad.

6. The retractable lithium ion Chi Liu drawframe of claim 5 wherein the thickness of the silica gel pad is 0.5-2mm.

7. The tightening lithium ion Chi Liu pull frame as claimed in claim 1, wherein the upper end of each movable clamping plate (3) is a trapezoid structure with gradually increasing width from top to bottom.

8. A collapsible li-ion Chi Liu pull frame as claimed in claim 1 wherein said telescoping cylinder (2) is a pneumatic, hydraulic or electric cylinder.