CN221614041U - Battery shell, battery and battery module - Google Patents

Abstract

The utility model discloses a battery shell, a battery and a battery module, wherein an upper curled edge is formed on the battery shell through the circumferential edge of an upper shell, a lower curled edge is formed on the circumferential edge of a lower shell, the upper curled edge and the lower curled edge are mutually overlapped and wound, a glue-containing piece is arranged between the upper curled edge and the lower curled edge, and the glue-containing piece comprises a gel coat and an adhesive wrapped in the gel coat; when the upper curled edge and the lower curled edge are subjected to winding edge sealing, the glue containing piece is extruded by the winding force to cause breakage, so that the adhesive in the glue containing piece flows out and is filled between the upper curled edge and the lower curled edge, sealing is realized, the glue containing piece is only required to be placed between the upper curled edge and the lower curled edge, the glue containing piece can be naturally extruded by the upper curled edge and the lower curled edge during winding, the packaging speed is improved, and the production efficiency is greatly improved; and the adhesive flows out and fills between upper hemming and lower hemming, is difficult to appear inhomogeneous condition, has reduced the risk of weeping.

Description

Battery shell, battery and battery module

Technical Field

The present utility model relates to the field of battery technologies, and in particular, to a battery case, a battery, and a battery module.

Background

In the prior art, the square shell battery generally completes the encapsulation of the battery upper cover and the lower shell through laser welding, the welding process has high requirement, the positioning accuracy is high, the weld joint can also have the defects of air holes, cracks, explosion points, weld bulges and the like, the welding deformation is large when the welding encapsulation is used for the thinner battery shell, if the welding encapsulation is carried out by using common glue for bonding and fixing, the glue coating speed is too slow, the production efficiency is low, the glue is easy to smear unevenly, even some places have poor tightness due to no glue, and the electrolyte in the battery is leaked, so that the risk of short circuit exists.

Disclosure of utility model

The utility model mainly aims to provide a battery shell and a battery, and aims to solve the technical problems that the efficiency of coating and packaging the battery shell by using glue is too low and coating is uneven.

In order to achieve the above object, a first aspect of the present utility model provides a battery case, comprising an upper case and a lower case, wherein the upper case is covered on the lower case, an upper bead is formed at a circumferential edge of the upper case, a lower bead is formed at a circumferential edge of the lower case, the upper bead and the lower bead are overlapped with each other, a glue containing member is provided between the upper bead and the lower bead, the glue containing member comprises a gel coat and an adhesive wrapped in the gel coat, and the upper bead and the lower bead are wound to form a curled portion.

Further, the glue containing piece is a glue strip.

Further, the adhesive tape is a flexible strip, and the head end and the tail end of the adhesive tape are intersected.

Further, the upper curled edge and/or the lower curled edge are/is provided with a positioning groove for positioning the adhesive tape, and the adhesive tape is placed in the positioning groove.

Further, the adhesive is flame-retardant adhesive.

Further, the gel coat is a flexible film.

Further, the glue-containing piece is arranged between the first layer of hemming and the second layer of hemming which are far away from the winding direction in the hemming part.

Further, an extension portion is arranged between the hemming portion and the peripheral edge of the upper shell and between the hemming portion and the peripheral edge of the lower shell, and the extension portion is bent and protruded in a direction away from the lower shell.

Further, the upper shell is an aluminum integrated part; the lower shell is an aluminum integrated part.

The second aspect of the present utility model provides a battery, including the battery case according to any one of the above embodiments, further including a winding core, where the winding core is disposed in the battery case.

A third aspect of the utility model proposes a battery module comprising a plurality of batteries as described in the above embodiments.

The beneficial effects are that:

According to the battery shell, the upper curled edge is formed on the circumferential edge of the upper shell, the lower curled edge is formed on the circumferential edge of the lower shell, the upper curled edge and the lower curled edge are mutually overlapped and wound to form the curled edge part, and the adhesive containing piece is arranged between the upper curled edge and the lower curled edge and contains adhesive; when the upper curled edge and the lower curled edge are subjected to winding edge sealing, the glue containing piece is extruded by the winding force to cause breakage, so that the adhesive in the glue containing piece flows out and is filled between the upper curled edge and the lower curled edge, sealing is realized, the glue containing piece is only required to be placed between the upper curled edge and the lower curled edge when the battery shell is subjected to winding edge sealing, the glue containing piece can be naturally subjected to extrusion force caused by winding when the upper curled edge and the lower curled edge are wound, the packaging speed is improved, and the production efficiency is greatly improved; and the adhesive flows out and fills between upper hemming and lower hemming, is difficult to appear inhomogeneous condition, reduces the risk of weeping.

Drawings

Fig. 1 is a schematic view illustrating an installation state of a battery case according to an embodiment of the present utility model;

FIG. 2 is a schematic view of section A-A of FIG. 1;

FIG. 3 is an enlarged partial schematic view of the portion I in FIG. 2;

FIG. 4 is an enlarged view of a portion of an adhesive tape placed in a positioning groove according to an embodiment of the present utility model;

FIG. 5 is an enlarged partial schematic view of a battery can according to an embodiment of the present utility model;

FIG. 6 is a schematic cross-sectional view of a strip.

Wherein:

1. An upper case; 11. an upper hemming;

2. a lower case; 21. a lower hemming;

3. A glue containing member; 31. an adhesive; 32. a gel coat;

4. A hemming portion; 41. a first layer hemming; 42. a second layer hemming; 43. a positioning groove;

5. An extension;

6. And (5) winding the core.

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless specifically defined otherwise.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; the connection may be mechanical connection, direct connection or indirect connection through an intermediate medium, and may be internal connection of two elements or interaction relationship of two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

Referring to fig. 1-6, an embodiment of the present utility model proposes a battery case, comprising an upper case 1 and a lower case 2, wherein the upper case 1 is covered on the lower case 2, an upper curled edge 11 is formed at a circumferential edge of the upper case 1, a lower curled edge 21 is formed at a circumferential edge of the lower case 2, the upper curled edge 11 and the lower curled edge 21 are overlapped with each other, a glue containing member 3 is disposed between the upper curled edge 11 and the lower curled edge 21, and the glue containing member 3 comprises a glue coating 32 and an adhesive 31 wrapped in the glue coating 32; the upper bead 11 and the lower bead 21 are wound to form the bead portion 4.

In the above embodiment, when the upper curl 11 and the lower curl 21 are subjected to winding edge sealing, the gel coat 32 of the gel-containing member 3 is extruded by the winding force to cause breakage, so that the adhesive 31 in the gel-containing member 3 flows out and fills between the upper curl 11 and the lower curl 21, thereby realizing sealing, when the battery case is subjected to winding edge sealing, the gel-containing member 3 is only required to be placed between the upper curl 11 and the lower curl 21, and when the upper curl 11 and the lower curl 21 are wound, the gel-containing member 3 can be subjected to the extrusion force caused by winding naturally, thereby saving the time of glue coating, improving the packaging speed and greatly improving the production efficiency; and, glue 31 fills between last turn-up 11 and lower turn-up 21 after flowing out, glue 31 distributes more evenly, guarantees sealed effect, has reduced the risk of weeping.

In the above embodiment, the large surfaces of the upper shell 1 and the lower shell 2 are flat surfaces, the peripheral edge of the upper shell 1 is bent and extended away from the flat surface where the upper shell 1 is located to form an upper curled edge 11, and the peripheral edge of the lower shell 2 is bent and extended away from the flat surface where the lower shell 2 is located to form a lower curled edge 21, that is, the upper curled edge 11 and the upper shell 1 are not in the same plane, and the lower curled edge 21 and the lower shell 2 are not in the same plane; the upper and lower beads 11 and 21 are overlapped with each other and wound to form the bead portion 4, and the bead portion 4 can join the circumferential edges of the upper and lower cases 1 and 2 together, thereby being capable of replacing the welding process in the prior art and avoiding the problems occurring in the welding process.

In the above embodiment, the glue containing member 3 may be a glue strip or a capsule, and the capsules contain the adhesive 31, and the capsules may be arranged between the upper curled edge 11 and the lower curled edge 21 at intervals and in a staggered manner according to requirements, when the capsules burst, the adhesive 31 leaks out and is cured, so as to realize the sealing of the upper curled edge 11 and the lower curled edge 21.

Referring to fig. 6, in one embodiment, the glue containing member 3 is a glue strip. The strip is flexible and bendable, and the adhesive 31 is closed inside the gel coat 32, and once the gel coat 32 breaks, the adhesive 31 flows out and fills between the upper and lower curls 11 and 21.

In the above embodiment, the adhesive 31 may be solid glue, gel, glue, etc., preferably glue, which has fluidity, and can flow and spread out, so as to increase the bonding area.

In one embodiment, the strip is a flexible strip, and the head and tail ends of the strip intersect. The flexible long adhesive tape can provide longer bonding length, is suitable for the situation that the periphery of the battery shell needs to be curled, the long adhesive tape surrounds the battery shell for one circle, and the head end and the tail end are connected by more than a surplus amount, so that the head-to-tail intersection design can ensure seamless connection between the adhesive tapes, and the bonding effect of bonding in place is provided; the length of the adhesive tape is greater than or equal to the perimeter of one side of the battery shell, when the length of the adhesive tape is longer, the adhesive tape is rich in allowance after being connected end to end, and the allowance of the adhesive tape can be bent for many times to form a wavy shape so as to increase the bonding area and further strengthen the bonding property, and the sealing effect is enhanced at the weak part where the upper curled edge 11 and the lower curled edge 21 are connected.

In one embodiment, the adhesive strip is a flexible annular adhesive strip. The annular adhesive tape has flexibility, can change the shape of the adhesive tape, is sleeved on the periphery of the square shell battery, is molded into a closed and complete square adhesive tape through the shell of the square shell battery, and is sleeved on the peripheral edge of the upper shell 1 or the lower shell 2, so that the bonding amount of each curled edge part 4 of the battery shell is kept consistent and the bonding is more uniform; similar to the above embodiment, the circumference of the annular adhesive tape is equal to or greater than the circumference of one side of the battery case, and is rich in margin, so that the bonding effect of the weak point is enhanced.

In one embodiment, the strip comprises a plurality of segments, with the head and tail ends of the segments intersecting each other. The multistage adhesive tape can be four sections, is used for the turn-up seal of battery case different faces respectively, and the tail end of first section adhesive tape intersects with the head end of second section adhesive tape, and the tail end of second section adhesive tape intersects with the head end of third section adhesive tape, and the tail end of third section adhesive tape intersects with the head end of fourth section adhesive tape, and the tail end of fourth section adhesive tape intersects with the head end of first section adhesive tape, and every section adhesive tape corresponds a face of battery case, and every section adhesive tape's head and tail intersection department corresponds the junction that sets up between face and face in the battery case, ensures that all around the battery case seals in place, can provide bigger bonding area.

Referring to fig. 4-5, in one embodiment, the upper bead 11 and/or the lower bead 21 are provided with a positioning groove 43 for positioning the glue strip, which glue strip is placed in the positioning groove 43. The positioning groove 43 is formed on the upper curled edge 11 and/or the lower curled edge 21, and the positioning groove 43 can be formed by punching the upper curled edge 11 and/or the lower curled edge 21; a side of the upper bead 11 facing the lower bead 21 forms a positioning groove 43 and/or a side of the lower bead 21 facing the upper bead 11 forms a positioning groove 43; the number of the positioning grooves 43 can be multiple, preferably, the positioning groove 43 on one side of the upper curled edge 11 facing the lower curled edge 21 corresponds to the positioning groove 43 on one side of the lower curled edge 21 facing the upper curled edge 11, and the sum of the depth of the positioning groove 43 and the positioning groove is smaller than the diameter of the adhesive tape, so that the adhesive tape in the positioning groove 43 is extruded when the upper curled edge 11 and the lower curled edge 21 are completely jointed; preferably, the shape of the positioning groove 43 is consistent with that of the adhesive tape, so that the adhesive tape can be attached to the positioning groove 43 and placed more stably; when the adhesive tape is long, the positioning effect is more obvious. The positioning groove 43 is provided to prevent displacement of the glue strip, ensuring that the glue strip is placed between the upper and lower curls 11, 21.

In one embodiment, the adhesive 31 is a flame retardant adhesive. The adhesive 31 has a flame-retardant effect, and common liquid flame-retardant adhesives include flame-retardant epoxy adhesives, flame-retardant polyurethane adhesives, flame-retardant silicone adhesives and the like, and when the adhesive tape is broken by extrusion force, the flame-retardant adhesives flow out, so that the upper curled edge 11 and the lower curled edge 21 can be sealed, and the flame propagation can be slowed down or hindered when the battery is in thermal runaway. In the above embodiment, the gel coat 32 is a flexible film, and may specifically be a polyethylene film or a polyurethane film. The gel coat 32 may be made of a material with excellent chemical resistance such as polyethylene, polyurethane or rubber, is insoluble in electrolyte, and provides excellent sealing performance after the gel coat 32 is broken.

In an embodiment, the upper curl 11 and the lower curl 21 are wound to form a curl portion 4, and the glue containing member 3 is disposed between a first layer curl 41 and a second layer curl 42 of the curl portion 4 which are away from the winding direction. Referring to fig. 4 to 5, the upper and lower beads 11 and 21 are extended and bent in the same direction to form respective vertical and horizontal edges, the longer beads are the upper beads 11, the glue containing member 3 before winding is placed at the horizontal edge between the upper and lower beads 11 and 21, and preferably at one end near the outer side, so that the glue containing member 3 is rapidly and stably placed, when winding, the upper beads 11 are bent in the direction of the lower beads 21 so that the horizontal edge of the lower beads 21 is sandwiched between the bent end of the upper beads 11 and the horizontal edge of the upper beads 11, the battery case is primarily sealed, the glue containing member is not dropped and is stably sandwiched between the horizontal edge of the upper beads 11 and the horizontal edge of the lower beads 21, the upper and lower beads 11 are wound again, the bent ends of the upper beads 11 are closed together with the bent ends of the upper beads 11 until the horizontal and vertical edges between the upper beads 11 and the lower beads 21 form an inner core of the glue containing portion 4, and simultaneously the glue containing member 3 is rapidly and conveniently sealed from the left to the right as viewed in fig. 4, and the winding efficiency is increased as shown in fig. 4, and the winding layer is rapidly and the winding efficiency is increased from the first and second bead layer (41 and the winding layer is provided in the winding layer is formed in the direction from the left to the winding layer and the winding layer is 4).

In the above embodiment, the extending portion 5 is provided between the hemming portion 4 and the circumferential edge of the upper case 1 and the circumferential edge of the lower case 2, and the extending portion 5 is bent and protruded in a direction away from the lower case 2. The hemming part 4 and the extending part 5 are integrated, the extending part 5 is bent and recessed towards the direction far away from the upper shell 1, meanwhile, the extending part 5 is bent upwards towards the direction far away from the lower shell 2, a circular arc-shaped bending surface is formed, concentration of stress at the bending position can be reduced, and stress distribution is improved.

In one embodiment, the upper case 1 and the lower case 2 are all integral molded parts made of aluminum. Specifically, the upper case 1 and the lower case 2 are each formed by punching an aluminum plate. The aluminum plate has lower density, so that the upper shell 1 and the lower shell 2 which are formed by stamping are relatively light, thereby being beneficial to the light design of the whole battery assembly; in addition, the stamping forming is used as a high-efficiency production process, so that the manufacturing cost can be reduced, and the production efficiency can be improved.

The second aspect of the present utility model proposes a battery, comprising a battery case according to any of the above embodiments, and further comprising a winding core 6, wherein the winding core 6 is disposed in the battery case.

A third aspect of the utility model proposes a battery module comprising a plurality of batteries as described in the above embodiments.

The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structures or equivalent processes using the descriptions and drawings of the present utility model or directly or indirectly applied to other related technical fields are included in the scope of the utility model.

Claims (11)

1. The battery shell is characterized by comprising an upper shell and a lower shell, wherein the upper shell is covered on the lower shell, an upper curled edge is formed at the circumferential edge of the upper shell, a lower curled edge is formed at the circumferential edge of the lower shell, the upper curled edge and the lower curled edge are mutually overlapped, a rubber-containing piece is arranged between the upper curled edge and the lower curled edge, and the rubber-containing piece comprises a rubber coating and an adhesive wrapped in the rubber coating; the upper and lower curls are wound to form a curled portion.

2. The battery housing of claim 1, wherein the glue-containing member is a glue strip.

3. The battery housing of claim 2, wherein the adhesive strip is a flexible strip, and wherein the head and tail ends of the adhesive strip intersect.

4. The battery case according to claim 2, wherein the upper bead and/or the lower bead is provided with a positioning groove for positioning the adhesive tape, the adhesive tape being placed in the positioning groove.

5. The battery housing of claim 2, wherein the adhesive is a flame retardant adhesive.

6. The battery housing of any one of claims 2-5, wherein the gel coat is a flexible film.

7. The battery case according to any one of claims 1 to 5, wherein the glue-containing member is provided between a first-layer bead and a second-layer bead which are distant from the winding direction in the bead portion.

8. The battery case according to claim 7, wherein an extension portion is provided between the beading portion and the peripheral edge of the upper case and the peripheral edge of the lower case, the extension portion being bent and protruded in a direction away from the lower case.

9. The battery housing of claim 1, wherein the upper case is an integral molded piece of aluminum; the lower shell is an aluminum integrated part.

10. A battery comprising the battery case according to any one of claims 1 to 9, and further comprising a winding core disposed in the battery case.

11. A battery module comprising a plurality of the batteries of claim 10.