CN216120416U

CN216120416U - Lithium battery surface pad

Info

Publication number: CN216120416U
Application number: CN202122027167.5U
Authority: CN
Inventors: 邢诗娜; 杜江伟
Original assignee: Hengdian Group DMEGC Magnetics Co Ltd
Current assignee: Hengdian Group DMEGC Magnetics Co Ltd
Priority date: 2021-08-25
Filing date: 2021-08-25
Publication date: 2022-03-22
Anticipated expiration: 2031-08-25

Abstract

The utility model discloses a lithium battery surface pad which comprises a surface pad body and a surface pad extension structure formed by extending the outer circumferential lower end of the surface pad body, wherein the surface pad body is fixed on the surface pad extension structure, and comprises a shockproof layer made of an impact-resistant material and a glue layer contacted with a battery. The utility model provides a lithium battery face pad, which has the function of preventing a face pad from falling off due to the fact that a battery core is impacted in a roller.

Description

Lithium battery surface pad

Technical Field

The utility model relates to the technical field of lithium ion batteries, in particular to a lithium battery surface cushion.

Background

The lithium ion battery has the advantages of high efficiency, quick charge and discharge, long cycle life, high safety performance and the like, so the lithium ion battery is applied to the field of electric tools. The lithium battery needs to be provided with a surface pad with the diameter of 17mm at the positive electrode end before film covering, and the main purpose of the lithium battery is to prevent the positive electrode end from contacting with a metal substance to cause an external short phenomenon. When the portable electric tool is used, the portable electric tool is often in a vibrating state, and is easily subjected to impact and collision, and once the battery has insufficient anti-vibration and anti-impact performance, the battery is easily damaged. Damage to the battery, which occurs while the power tool is in use, may not only affect the proper operation of the power tool, but may also damage the power tool. Therefore, the battery core randomly extracts a sample from the single battery core to perform roller test before shipment, the test sample is placed in the roller, and the roller rotates at fixed speed and fixed time by 360 degrees under the control of the operating platform. Because the test battery continuously rolls and impacts in the box body, the head of the battery can generate the phenomena of film covering falling and surface pad falling, and the phenomenon has the risk of short circuit caused by the collision of the positive terminal of the battery and the wall of the roller, so that the vibration resistance and the shock resistance of the battery can not be judged.

At present, before shipment of an electric core, a sample is randomly extracted from a single electric core to perform roller test, the test sample is placed in a roller, and the roller is controlled by an operation table to rotate at a fixed speed and a fixed time by 360 degrees. Because the test battery continuously rolls and impacts in the box body, the head of the battery can generate the phenomena of film covering falling and surface pad falling, and the phenomenon has the risk of short circuit caused by the collision of the positive terminal of the battery and the wall of the roller, so that the vibration resistance and the shock resistance of the battery can not be judged.

For example, the disclosure of the chinese patent document "an automatic assembling mechanism for a lithium battery pack" in the publication No. CN106711509A includes a frame, on which a plurality of clamping blocks capable of sliding back and forth relative to the frame are disposed, and the clamping blocks can slide to the side of a guide piece. The utility model relates to a face pad device, which does not improve the shape structure of the face pad and can not be used in the performance test of judging the vibration resistance and the shock resistance of the battery by a roller.

For example, a chinese patent document discloses "a lithium ion battery rapid heating insulating face pad suitable for ultra-low temperature environment", whose publication number CN211507739U includes a face pad body; the surface pad body is provided with a first insulating layer and a second insulating layer, concave-convex hot-pressing compounding is arranged between the first insulating layer and the second insulating layer, the middle end of the surface pad body is provided with a pole insulating matching hole and a pole positioning groove, and the lower end of the surface pad body is provided with an insulating glue layer; the utility model has the advantages of simple and reasonable structure, convenient use, low manufacturing cost, firm connection, certain vibration resistance, good insulation, safety and reliability, and prolongs the service life of the lithium ion battery. The disadvantage is that the insulating surface pad is still a sheet structure, and the vibration-proof effect is not ideal.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problems that in a roller test, a battery continuously rolls and impacts in a box body, a film covering and falling phenomenon and a surface pad falling phenomenon occur at the head of the battery, and the risk of short circuit caused by collision of the positive terminal of the battery and the wall of a roller exists, and provides a lithium battery surface pad which has the function of preventing the surface pad from falling due to impact of a battery core in the roller.

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

the utility model provides a lithium cell face pad, includes that the face fills up body and the face pad extension structure that this external circumference lower extreme of face pad extended and form, its characterized in that: the face pad body is fixed on the face pad extension structure and comprises a shockproof layer made of an impact-resistant material and a glue layer in contact with the battery. The morphological structure of lithium cell face pad is reformed transform, reform transform into three-dimensional form by original slice, the face pad increases the lower extreme extension on original basis, and set up the glue film at face pad and box hat top contact segment, can increase electric core head partial thickness and play the fixed effect of gasket like this, set up the shockproof layer with box contact department on the glue film, improve the performance of anti-vibration and shock resistance of battery head, effectively improve the circumstances that the face pad that electric core striking leads to in the cylinder drops, prevent that positive terminal and metallic substance contact from taking place outer short phenomenon.

Preferably, the three-dimensional structure formed by the surface pad body and the surface pad extension structure wraps the positive electrode end of the lithium battery. This three-dimensional column structure face pad can wrap up electric core head block outer lane and electric core upper end part, prevents that the face pad from dropping.

Preferably, the diameter of the cushion body is 16-17 mm. The diameter of the positive terminal of the lithium battery is 17mm, and the diameter of the surface pad is slightly smaller than that of the lithium battery, so that the surface pad is tightly sleeved at the positive terminal of the lithium battery.

Preferably, the length of the pad extension is 2-10 mm. The length of the surface pad extension structure cannot be too short, so that the surface pad is prevented from falling off of part of the battery cells due to insufficient length of the lower end of the surface pad in the roller test of the battery cells; the length of the surface pad extension structure cannot be too long, so that the battery cell is prevented from falling off in the roller test process, but the surface pad covers the lithium battery in an overlarge range, and the vibration resistance and impact resistance of the battery cannot be judged.

Preferably, the thickness of the cushion body is 1-2 mm. The cushion body comprises a shockproof layer and a glue layer, the thickness of the shockproof layer and the glue layer cannot be too large, the weight of the cushion is prevented from being large, and the cushion is easy to fall off under the action of gravity during roller test; the thickness of shockproof layer and glue film can not the undersize, prevents to play the effect that can not increase the thickness of electric core head part and play the gasket fixed.

Preferably, the face pad extension structure comprises a first face pad extension structure and a second face pad extension structure, and the length of the first face pad extension structure is greater than that of the second face pad extension structure. The length of first face pad extension structure is greater than the length of second face pad extension structure for second face pad extension structure can be wrapped up by first face pad extension structure completely, and the length of face pad extension structure this moment is minimum.

Preferably, the surface of the inner side wall of the first face pad extension structure is provided with a sliding groove, the surface of the outer side wall of the second face pad extension structure is provided with a convex strip, and the sliding groove is matched with the convex strip. When the position of first face pad extension structure and second face pad extension structure is adjusted according to the length of face pad extension structure, slide the sand grip on the lateral wall surface of second face pad extension structure along the spout on the medial wall surface of first face pad extension structure.

The first face pad extension structure inside wall surface is equipped with the sand grip, the second face pad extension structure outside wall surface is equipped with the spout, spout and sand grip cooperation. When the position of first face pad extension structure and second face pad extension structure is adjusted according to the length of face pad extension structure, slide the sand grip on the lateral wall surface of first face pad extension structure along the spout on the lateral wall surface of second face pad extension structure.

Preferably, the surface of the outer side wall of the first face pad extension structure is provided with a plurality of elastic lugs, the surface of the outer side wall of the second face pad extension structure is provided with a plurality of positioning holes, and the elastic lugs are matched with the positioning holes. When the position of the first face pad extension structure and the second face pad extension structure is adjusted according to the length of the face pad extension structure, the elastic lug blocks the positioning hole matched with the elastic lug, so that the length of the face pad extension structure is fixed as required, and the lithium batteries of different models are matched.

Preferably, the surfaces of the shockproof layer and the adhesive layer are provided with tooth-shaped structures for increasing friction force, and the shockproof layer is glued with the adhesive layer. The contact part of the adhesive layer and the positive end of the battery is provided with a tooth-shaped structure, so that the surface friction force is increased, and the battery core is less prone to falling off of the surface pad in a roller test; the cementing is a process method for connecting two cementing pieces by utilizing mechanical binding force, physical adsorption force and chemical bonding force generated by an adhesive on a connecting surface, the cementing is not only suitable for the same material, but also suitable for different materials, the cementing process is simple and convenient, complex process equipment is not needed, the cementing operation does not need to be carried out under high temperature and high pressure, so that the cementing pieces are not easy to deform, and the stress distribution of the joints is uniform. In general, a glue joint has good sealability, electrical insulation and corrosion resistance.

The utility model has the following beneficial effects: (1) the battery core is prevented from being impacted in the roller to cause the surface pad to fall off; (2) the short circuit caused by the collision of the positive terminal of the battery and the wall of the drum is prevented; (3) the surface pad is suitable for lithium batteries of different models.

Drawings

The utility model is further illustrated with reference to the figures and examples.

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged view of a portion of the present invention;

FIG. 3 is a schematic diagram of the second embodiment.

In the figure: the utility model provides a face pad body 1, shockproof layer 1.1, glue film 1.2, face pad extension structure 2, first face pad extension structure 2.1, second face pad extension structure 2.2, spout 3, sand grip 4, elastic projection 5, locating hole 6, dentate structure 7.

Detailed Description

The first embodiment is as follows:

as shown in fig. 1 or fig. 2, a lithium battery surface pad comprises a surface pad body 1 and a surface pad extending structure 2 formed by extending the periphery of the surface pad body 1 to the lower end, wherein the surface pad body 1 is fixed on the surface pad extending structure 2, and the surface pad body 1 comprises a shockproof layer 1.1 made of an impact-resistant material and an adhesive layer 1.2 in contact with a battery; the surface pad body 1 and the surface pad extension structure 2 form a three-dimensional structure to wrap the positive end of the lithium battery; the surface pad extension structure 2 comprises a first surface pad extension structure 2.1 and a second surface pad extension structure 2.2, and the length of the first surface pad extension structure 2.1 is greater than that of the second surface pad extension structure 2.2; the surface of the inner side wall of the first surface pad extension structure 2.1 is provided with a sliding groove 3, the surface of the outer side wall of the second surface pad extension structure 2.2 is provided with a convex strip 4, and the sliding groove 3 is matched with the convex strip 4; the outer side wall surface of the first surface pad extension structure 2.1 is provided with a plurality of elastic lugs 5, the outer side wall surface of the second surface pad extension structure 2.2 is provided with a plurality of positioning holes 6, and the elastic lugs 5 are matched with the positioning holes 6; the surfaces of the shockproof layer 1.1 and the adhesive layer 1.2 are provided with a dentate structure 7 for increasing friction force, and the shockproof layer 1.1 is connected with the adhesive layer 1.2 in a cementing manner; the diameter of the cushion body 1 is 17mm, the length of the cushion extension structure 2 is 5-10mm, and the thickness of the cushion body 1 is 1 mm.

Among the above-mentioned technical scheme, the morphological structure of lithium cell face pad is reformed transform, reform transform into three-dimensional form by original slice, the face pad increases the lower extreme extension on original basis, and set up the glue film at face pad and box top contact segment, can increase electric core head partial thickness and play the fixed effect of gasket like this, set up shockproof layer 1.1 with box contact department on glue film 1.2, improve the anti-vibration and the performance of shocking resistance of battery head, effectively improve the condition that the face pad that the electric core striking leads to in the cylinder drops, prevent that positive terminal and metallics contact from taking place outer short phenomenon, this three-dimensional structure face pad can wrap up electric core head cap outer lane and electric core upper end part, prevent that the face pad from dropping. The length of the first face cushion extension structure 2.1 is greater than the length of the second face cushion extension structure 2.2, so that the second face cushion extension structure 2.2 can be completely wrapped by the first face cushion extension structure 2.1, and the length of the face cushion extension structure 2 is the smallest at this time; when the position of the first face pad extension structure 2.1 of length adjustment according to face pad extension structure 2 and second face pad extension structure 2.2, slide the sand grip 4 on the lateral wall surface of second face pad extension structure 2.2 along the spout 3 on the inside wall surface of first face pad extension structure 2.1, elastic bump 5 blocks the locating hole 6 of adaptation with it, thereby the length of fixed surface pad extension structure 2 as required, thereby the lithium cell of the different models of adaptation. A tooth-shaped structure 7 is arranged at the contact position of the adhesive layer 1.2 and the positive end of the battery, so that the surface friction force is increased, and the battery cell is less prone to falling off of the surface pad in a roller test; the gluing is a process method for connecting two gluing pieces by utilizing mechanical bonding force, physical adsorption force and chemical bonding force generated by an adhesive on a connecting surface, the gluing is not only suitable for the same material, but also suitable for different materials, the gluing process is simple and convenient, complex process equipment is not needed, and the gluing operation does not need to be carried out at high temperature and high pressure, so that the gluing pieces are not easy to deform, the stress distribution of the joints is uniform, and the gluing joints have good tightness, electrical insulation and corrosion resistance under normal conditions; the diameter of the positive end of the lithium battery is 17mm, and the diameter of the surface pad is slightly smaller than that of the lithium battery, so that the surface pad is tightly sleeved on the positive end of the lithium battery, and when the surface pad is sleeved on the positive end of the lithium battery, the diameter of the surface pad is the same as that of the positive end of the lithium battery, and the diameter of the surface pad is 17 mm; the length of the surface pad extension structure 2 cannot be too short, so that the surface pad is prevented from falling off of part of the battery cells due to insufficient length of the lower end of the surface pad in the roller test of the battery cells; the cushion body 1 comprises a shockproof layer 1.1 and an adhesive layer 1.2, the thicknesses of the shockproof layer 1.1 and the adhesive layer 1.2 cannot be too large, so that the cushion is prevented from being heavy, and the cushion is easy to fall off under the action of gravity during roller test; the thickness of the shockproof layer 1.1 and the adhesive layer 1.2 cannot be too small, so that the thickness of the head part of the battery cell cannot be increased, and the gasket cannot be fixed.

The second embodiment is as follows:

as shown in fig. 3, the length of the pad extension structure 2 is 2-5mm, which is different from that of the embodiment 1, based on the embodiment 1.

Among the above-mentioned technical scheme, face pad body 1 and face pad extension structure 2 parcel electric core head block outer lane and electric core upper end part, face pad diameter is unchangeable, face pad lower extreme length control < 5mm, electric core is in the drum test, the face pad is because lower extreme length is not enough, the condition that the face pad drops still has partial electric core to appear, the length of face pad extension structure 2 can not the overlength, prevent that electric core is in the drum test, although the face pad drops the phenomenon not appearing, but the scope of face pad parcel lithium cell is too big, thereby can't judge the anti-vibration and the shock resistance's of battery performance, and face pad extension structure 2's length is short, can material saving.

Claims

1. The utility model provides a lithium cell face pad, includes face pad body (1) and face pad body (1) periphery to the face pad extension structure (2) that the lower extreme extended and form, its characterized in that: the cushion body (1) comprises a shockproof layer (1.1) made of an impact-resistant material and an adhesive layer (1.2) in contact with the battery.

2. A lithium battery cell pack as claimed in claim 1, wherein: the face pad body (1) and the face pad extension structure (2) form a three-dimensional structure to wrap the positive end of the lithium battery.

3. A lithium battery cell pack as claimed in claim 1, wherein: the diameter of the face pad body (1) is 16-17 mm.

4. A lithium battery cell pack as claimed in claim 1, wherein: the length of the face pad extension structure (2) is 2-10 mm.

5. A lithium battery cell pack as claimed in claim 1, wherein: the thickness of the face pad body (1) is 1-2 mm.

6. A lithium battery cell pack as claimed in claim 1, wherein: the face pad extension structure (2) comprises a first face pad extension structure (2.1) and a second face pad extension structure (2.2), and the length of the first face pad extension structure (2.1) is greater than that of the second face pad extension structure (2.2).

7. A lithium battery cell pack as claimed in claim 6, wherein: first face pad extension structure (2.1) inside wall surface is equipped with spout (3), the outside wall surface of second face pad extension structure (2.2) is equipped with sand grip (4), spout (3) and sand grip (4) cooperation.

8. A lithium battery cell pack as claimed in claim 6, wherein: the inside wall surface of first face pad extension structure (2.1) is equipped with sand grip (4), the outside wall surface of second face pad extension structure (2.2) is equipped with spout (3), spout (3) and sand grip (4) cooperation.

9. A lithium battery cell pack as claimed in claim 6, wherein: the outer side wall surface of the first face pad extension structure (2.1) is provided with a plurality of elastic lugs (5), the outer side wall surface of the second face pad extension structure (2.2) is provided with a plurality of positioning holes (6), and the elastic lugs (5) are matched with the positioning holes (6).

10. A lithium battery cell pack as claimed in claim 1, wherein: the surface of the shockproof layer (1.1) and the surface of the adhesive layer (1.2) are provided with tooth-shaped structures (7) for increasing friction force, and the shockproof layer (1.1) is connected with the adhesive layer (1.2) in a gluing mode.