CN219286537U

CN219286537U - Battery cell

Info

Publication number: CN219286537U
Application number: CN202320189345.0U
Authority: CN
Inventors: 李凝; 颜廷露; 周鹏飞
Original assignee: China Lithium Battery Technology Co Ltd
Current assignee: China Lithium Battery Technology Co Ltd
Priority date: 2023-02-02
Filing date: 2023-02-02
Publication date: 2023-06-30
Anticipated expiration: 2033-02-02

Abstract

The disclosure relates to the technical field of batteries, and discloses a battery; the battery comprises a battery shell, wherein a strength enhancing structure is arranged on at least part of the outer surface of the battery shell, and comprises an adhesive layer and glass fiber cloth; the bonding layer is bonded to the outer surface of the battery shell; the glass fiber cloth is adhered to one side of the adhesive layer, which is away from the battery shell, and is made of insulating materials. The strength of the battery shell can be increased, the deformation of the battery shell is reduced, and the electrical property and the safety of the battery are ensured through the glass fiber cloth; the glass fiber cloth can insulate the battery shell, so that the battery shell is prevented from being connected with other adjacent structures in a conducting way; the glass fiber cloth can also play a role in heat insulation, so that under the condition that one battery is overheated, the heat transferred to the adjacent battery is reduced, the phenomenon that the adjacent battery is overheated is avoided, and the safety of the battery is ensured; the life of the battery case is also increased to increase the service life of the battery.

Description

Battery cell

Technical Field

The disclosure relates to the technical field of batteries, and in particular relates to a battery.

Background

With the rapid development of modern industry, the problems of environmental pollution, energy shortage, resource exhaustion and the like brought along with the rapid development of the modern industry are more and more prominent. In order to maintain economic sustainable development and protect the environment and energy supply for human living, zero emission of batteries is the first choice as a new energy source.

However, the battery case of the current battery is easily deformed.

It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not constitute prior art known to those of ordinary skill in the art.

Disclosure of Invention

The present disclosure aims to overcome the defect that the battery case of the related art is easy to deform, and provide a battery with a battery case which is not easy to deform.

According to one aspect of the present disclosure, there is provided a battery including:

a battery housing provided with a strength enhancing structure on at least a portion of an outer surface of the battery housing, the strength enhancing structure comprising:

an adhesive layer adhered to the outer surface of the battery case;

and the glass fiber cloth is adhered to one side of the adhesive layer, which is away from the battery shell, and is made of an insulating material.

The battery disclosed by the utility model is characterized in that a strength reinforcing structure is arranged on the outer surface of a battery shell, and the strength reinforcing structure comprises an adhesive layer and glass fiber cloth which are sequentially laminated; the strength of the battery shell can be increased, the deformation of the battery shell is reduced, and the electrical property and the safety of the battery are ensured through the glass fiber cloth; the glass fiber cloth can insulate the battery shell, so that the battery shell is prevented from being connected with other adjacent structures in a conducting way; in addition, the glass fiber cloth can also play a role in heat insulation, so that under the condition that one battery is overheated, the heat transferred to the adjacent battery is reduced, the phenomenon that the adjacent battery is overheated is avoided, and the safety of the battery is ensured; furthermore, the glass fiber cloth has good corrosion resistance, can reduce the corrosion of electrolyte to the battery shell, and prolongs the service life of the battery shell so as to prolong the service life of the battery.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure. It will be apparent to those of ordinary skill in the art that the drawings in the following description are merely examples of the disclosure and that other drawings may be derived from them without undue effort.

Fig. 1 is a schematic structural view of an example embodiment of a battery of the present disclosure.

Fig. 2 is a schematic structural view of an exemplary embodiment of the strength enhancing structure of fig. 1.

Fig. 3 is a schematic structural view of another exemplary embodiment of the strength enhancing structure of fig. 1.

Fig. 4 is a schematic structural view of yet another exemplary embodiment of the strength enhancing structure of fig. 1.

Fig. 5 is a schematic view of the structure of an exemplary embodiment of a battery of the present disclosure at a liquid injection hole.

Fig. 6 is a schematic structural view of another example embodiment of a battery of the present disclosure at a liquid injection hole.

Fig. 7 is a schematic structural view of an example embodiment at an explosion-proof valve of a battery of the present disclosure.

Fig. 8 is a schematic structural view of another example embodiment at an explosion-proof valve of a battery of the present disclosure.

Reference numerals illustrate:

1. a battery case; 11. a main body portion; 111. a bottom plate; 112. a side plate; 12. a cover plate;

2. a strength enhancing structure; 21. an adhesive layer; 22. glass fiber cloth; 23. a resin layer; 24. a protective layer;

3. a liquid injection hole; 4. an explosion-proof structure; 5. a battery post; 6. and (5) a sealing structure.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus detailed descriptions thereof will be omitted. Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale.

Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of an icon to another component, these terms are used in this specification for convenience only, such as in terms of the orientation of the examples described in the figures. It will be appreciated that if the device of the icon is flipped upside down, the recited "up" component will become the "down" component. When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure through another structure.

The terms "a," "an," "the," "said" and "at least one" are used to indicate the presence of one or more elements/components/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. in addition to the listed elements/components/etc.; the terms "first," "second," and "third," etc. are used merely as labels, and do not limit the number of their objects.

In the present application, unless explicitly specified and limited otherwise, the term "coupled" is to be construed broadly, and for example, "coupled" may be either fixedly coupled, detachably coupled, or integrally formed; can be directly connected or indirectly connected through an intermediate medium. "and/or" is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

The exemplary embodiments of the present disclosure provide a battery, which may include a battery case 1 and a strength reinforcement structure 2, as shown in fig. 1 to 8, the strength reinforcement structure 2 being provided at least a portion of an outer surface of the battery case 1, and the strength reinforcement structure 2 may include an adhesive layer 21 and a glass cloth 22; the adhesive layer 21 is adhered to the outer surface of the battery case 1; the glass fiber cloth 22 is adhered to the side of the adhesive layer 21 facing away from the battery case 1, and the glass fiber cloth 22 is made of an insulating material.

The battery of the present disclosure is provided with a strength reinforcing structure 2 on the outer surface of a battery case 1, the strength reinforcing structure 2 including an adhesive layer 21 and a glass fiber cloth 22 laminated in this order; on the one hand, the strength of the battery shell 1 can be increased through the glass fiber cloth 22, the deformation of the battery shell 1 is reduced, and the electrical performance and the safety of the battery are ensured; on the other hand, the glass fiber cloth 22 can insulate the battery shell 1, so that the battery shell 1 is prevented from being connected with other adjacent structures in a conducting way; on the other hand, the glass fiber cloth 22 can also play a role of heat insulation, so that when one battery is overheated, the heat transferred to the adjacent battery is reduced, the overheat phenomenon of the adjacent battery is avoided, and the safety of the battery is ensured; on the other hand, the glass fiber cloth 22 has good corrosion resistance, can reduce the corrosion of the electrolyte to the battery case 1, and can prolong the service life of the battery case 1 so as to prolong the service life of the battery.

In the present exemplary embodiment, referring to fig. 1, the battery may be a cylindrical battery, and thus, the battery case 1 may be provided as a cylinder, for example, the battery case 1 may include a body part 11 and a cover plate 12, the body part 11 may include a bottom plate 111 and a side plate 112, the cover plate 12 and the bottom plate 111 are disposed opposite to each other, the cover plate 12 and the bottom plate 111 are each disposed in a circular shape, the side plate 112 is connected between the cover plate 12 and the bottom plate 111, and the side plate 112 is provided in a cylindrical shape. The side plate 112 and the bottom plate 111 surround a housing chamber forming the main body 11, and the main body 11 has an opening portion, which communicates to the housing chamber, and the cover plate 12 is provided at the opening portion.

Of course, in other example embodiments of the present disclosure, the bottom plate 111 and the cover plate 12 may be provided in a rectangular shape, an oval shape, a trapezoid shape, etc., and the side plates 112 may be provided in one or more and surround to form a rectangular shape, an oval shape, a trapezoid shape, etc., such that the battery case 1 is formed in a rectangular shape, an oval cylindrical shape, a prismatic shape, etc. The battery case 1 may have other shapes, and will not be described in detail herein.

In the present exemplary embodiment, an electrical cell is provided in the receiving chamber of the battery housing 1, which can be provided as a cylinder adapted to the battery housing 1. The battery cell may include a positive electrode tab and a negative electrode tab (not shown), and a separator (not shown) disposed between the positive electrode tab and the negative electrode tab.

In the present exemplary embodiment, the battery may further include a positive electrode tab and a negative electrode tab (not shown in the drawings). The positive electrode lug is connected with the battery core, specifically, the positive electrode lug is connected with the positive electrode plate; the positive electrode lug is positioned at one end of the electric core close to the cover plate 12, namely, the positive electrode lug is positioned at one end of the electric core close to the battery pole 5. The negative electrode lug is connected with the battery cell, specifically, the negative electrode lug is connected with the negative electrode plate; the negative electrode tab and the positive electrode tab may be located on the same side of the battery cell, i.e., the negative electrode tab may be located at one end of the battery cell near the cover plate 12, or the negative electrode tab may be located at one end of the battery cell near the battery post 5. Of course, in other example embodiments of the present disclosure, the negative tab and the positive tab may be located at opposite ends of the cell, i.e., the positive tab is located at an end of the cell near the cover plate 12, and the negative tab may be located at an end of the cell near the bottom plate 111.

Referring to fig. 1, a battery post 5 is disposed on one side of the battery core, which is close to the cover plate 12, and a positive tab is connected to the battery post 5; the battery post 5 protrudes out of the battery case 1 through a through hole in the cover plate 12, and the battery post 5 forms the positive electrode of the battery. Further, the battery post 5 is disposed coaxially with the battery, i.e., the center axis of the battery post 5 is collinear with the center axis of the battery. And the negative electrode tab may be connected to the battery case 1, the battery case 1 forming the negative electrode of the battery. And the battery post 5 is connected to the battery case 1 in an insulating manner, specifically, the battery post 5 is connected to the cap plate 12 in an insulating manner.

Of course, in other example embodiments of the present disclosure, the battery post 5 may be the negative electrode of the battery and the battery case 1 may be the positive electrode of the battery; two battery poles 5 may be further disposed, one battery pole 5 is an anode of the battery, the other battery pole 5 is a cathode of the battery, and the two battery poles 5 may be both connected with the battery housing 1 in an insulating manner.

In the present exemplary embodiment, the side surfaces of the battery cells are covered with insulating films, and the battery cells are insulated from the side plates 112 of the battery case 1 by the insulating films.

Since the battery case 1 forms the negative electrode of the battery, a part of the battery case 1 needs to be insulated, and the battery case 1 is prevented from being electrically charged with other structures due to contact with other adjacent structures, thereby causing a safety accident. For example, in the case where the battery post 5 forms the positive electrode of the battery and the battery case 1 forms the negative electrode of the battery, since the lid plate 12 of the battery case 1 needs to be electrically connected to a bus bar (not shown in the drawings), insulation is not required, and the main body portion 11 (the side plate 112 and the bottom plate 111) of the battery case 1 does not need to be electrically connected to other structures, insulation is required, and therefore, the strength reinforcing structure 2 may be provided on the outer surface of the main body portion 11 (the side plate 112 and the bottom plate 111). The battery case 1 of two adjacent batteries is prevented from contacting to connect the two adjacent batteries in a conductive manner when a plurality of single batteries are combined to form a battery module or a battery pack.

Of course, in other example embodiments of the present disclosure, where the body portion 11 of the battery needs to be electrically connected to the bus bar, and the cover plate 12 does not need to be electrically connected to the bus bar, the strength enhancing structure 2 may also be provided on the outer surface of the cover plate 12. In the case where the battery is provided with two battery poles 5, the two battery poles 5 are electrically connected to the bus bar, and the strength reinforcing structure 2 may be provided on the outer surfaces of the cover plate 12 and the main body 11 (the side plate 112 and the bottom plate 111) in the case where the battery case 1 does not need to be electrically connected to the bus bar.

It should be noted that the "cover plate 12" and the "bottom plate 111" may be exchanged, that is, the "cover plate 12" may be used as the "bottom plate 111", and the "bottom plate 111" may be used as the "cover plate 12" at the same time.

The battery case 1 may be made of an insulating material, for example, plastic, resin, or the like. However, the battery case 1 made of plastic, resin, or the like is easily deformed.

The battery case 1 may be a metal battery case 1, i.e., the material of the battery case 1 may be metal, for example, the material of the battery case 1 may be aluminum, copper, nickel, or the like. The strength of the metal battery case 1 is enhanced, but the density of the metal material is high, so that the thickness of the metal battery case 1 is designed to be thinner and thinner to increase the energy density of the battery; the battery case 1 made of metal is easy to deform after long-term use, so that a series of safety problems are caused, for example, the deformed battery case 1 can squeeze the battery core, and the battery case 1 and the battery core are connected and conducted when serious, so that safety problems such as short circuit and the like are caused.

In order to solve the above-described problems, in the present exemplary embodiment, as shown in fig. 2 to 4, a strength reinforcing structure 2 is provided on the outer surface of the battery case 1.

Referring to fig. 2, the strength reinforcement structure 2 may include an adhesive layer 21 and a glass cloth 22. The adhesive layer 21 is provided on the outer surface of the battery case 1, a glass fiber cloth 22 is provided on the side of the adhesive layer 21 facing away from the battery case 1, and the glass fiber cloth 22 is made of an insulating material. The glass cloth 22 is an inorganic nonmetallic material excellent in performance, and has advantages of good insulation, strong heat resistance, good corrosion resistance, high mechanical strength, but has disadvantages of brittleness and poor wear resistance. Glass fibers are commonly used as reinforcing materials, electrical insulation materials and thermal insulation materials.

The glass fiber filament diameter of the glass fiber cloth 22 is 8 micrometers or more and 15 micrometers or less, for example, the glass fiber filament diameter of the glass fiber cloth 22 may be 9 micrometers, 10 micrometers, 11.5 micrometers, 13 micrometers, 14 micrometers, or the like.

The strength of the battery shell 1 can be increased through the glass fiber cloth 22, the deformation of the battery shell 1 is reduced, and the electrical performance of the battery is further ensured; the glass fiber cloth 22 can insulate the battery shell 1, so that the battery shell 1 is prevented from being connected with other adjacent structures in a conducting way; in addition, the glass fiber cloth 22 can also play a role of heat insulation, and when one battery is overheated, the heat transferred to the adjacent battery is reduced, so that the adjacent battery is prevented from being overheated. Furthermore, the glass fiber cloth 22 has good corrosion resistance, can reduce the corrosion of the electrolyte to the battery shell 1, and can prolong the service life of the battery shell 1 so as to prolong the service life of the battery.

Further, the adhesive layer 21 may be an adhesive resin layer, and the glass fiber cloth 22 may be directly adhered to the outer surface of the battery case 1 through the adhesive resin layer. The adhesive resin layer is a resin with certain adhesiveness, and may be coated on the outer surface of the battery case 1, and then the glass fiber cloth 22 is covered on the surface of the adhesive resin layer facing away from the battery case 1, so that the adhesive resin layer may adhere the glass fiber cloth 22 to the outer surface of the battery case 1. Further, the adhesive resin layer may adhere the dispersed glass fibers of the glass fiber cloth 22 on the side close to the battery case 1 together. Secondly, the resin also has a transfer effect. The glass fiber shearing machine can transfer load to the glass fiber, so that the glass fiber at the upper part is pressed, the glass fiber at the lower part is pulled, and the glass fiber at the middle part is sheared. Meanwhile, different adhesive resin layers have different properties. Different properties can be achieved by providing different types of adhesive resin layers, for example, the adhesive resin layers can be made of polyacrylate, aromatic and aliphatic polymethacrylate, and can also be made of epoxy-acrylate, phosphate, polyurethane, cyanoacrylate and other resin materials.

In another exemplary embodiment of the present disclosure, referring to fig. 3, the adhesive layer 21 may be selected from a common adhesive, for example, the adhesive layer 21 may include a pressure sensitive adhesive or a composition of rubber and resin. A resin layer 23 is provided on the side of the adhesive layer 21 facing away from the battery case 1, and a glass fiber cloth 22 is provided on the side of the resin layer 23 facing away from the battery case 1, in which case the resin layer 23 may be coated on the glass fiber cloth 22 to form a laminated structure in which the resin layer 23 and the glass fiber cloth 22 are bonded, and then the resin layer 23 is adhered to the outer surface of the battery case 1 through the adhesive layer 21. The resin layer 23 may bond the dispersed glass fibers of the glass fiber cloth 22 on the side close to the battery case 1 together. Secondly, the resin also has a transfer effect. The glass fiber shearing machine can transfer load to the glass fiber, so that the glass fiber at the upper part is pressed, the glass fiber at the lower part is pulled, and the glass fiber at the middle part is sheared. Meanwhile, different resin layers 23 have different properties. By adding different types of resin layers 23, different properties can be obtained, for example, the material of the resin layers 23 may be polyacrylate, aromatic and aliphatic polymethacrylate, or may be epoxy-acrylate, phosphate, polyurethane, cyanoacrylate, or other resin materials.

Referring to fig. 4, in other exemplary embodiments of the present disclosure, the battery may further include a protective layer 24, where the protective layer 24 is disposed on a side of the glass fiber cloth 22 facing away from the battery case 1, and the broken glass fiber may be itchy if the glass fiber cloth 22 directly contacts the skin due to poor wear resistance of the glass fiber cloth 22; the protective layer 24 is arranged on one side of the glass fiber cloth 22, which is away from the battery shell 1, so that friction to the glass fiber cloth 22 can be avoided, and the service life of the glass fiber cloth 22 is prolonged, so that the service life of the battery is ensured, and in addition, the glass fiber cloth 22 can be prevented from being directly contacted by workers, and damage to the health of the workers is avoided.

The protective layer 24 may be a resin protective layer, that is, the material of the protective layer 24 may be resin. The protective layer 24 of resin material may bond together the dispersed glass fibers of the side of the glass fiber cloth 22 facing away from the battery case 1. Secondly, the resin also has a transfer effect. The glass fiber shearing machine can transfer load to the glass fiber, so that the glass fiber at the upper part is pressed, the glass fiber at the lower part is pulled, and the glass fiber at the middle part is sheared. Meanwhile, different resin protective layers have different properties. Different properties can be obtained by adding different types of resin protective layers, for example, the materials of the resin protective layers can be polyacrylate, aromatic and aliphatic polymethacrylate, and can also be epoxy-acrylate, phosphate, polyurethane, cyanoacrylate and other resin materials.

In the present exemplary embodiment, referring to fig. 5 and 6, the battery case 1 is provided with the liquid injection hole 3, the sealing structure 6 is provided in the liquid injection hole 3, and the sealing structure 6 is detachably provided in the liquid injection hole 3. After the battery is assembled, electrolyte is injected through the electrolyte injection hole 3, and then the electrolyte injection hole 3 is sealed through the sealing structure 6. The strength enhancement structure 2 covers the liquid injection hole 3, namely, the strength enhancement structure 2 completely covers the liquid injection hole 3, and as the glass fiber cloth 22 in the strength enhancement structure 2 has good corrosion resistance, even if electrolyte leaks from a gap between the liquid injection hole 3 and the sealing structure 6, the glass fiber cloth 22 can block the electrolyte, so that the electrolyte is prevented from leaking to the outer surface of the battery shell 1, the corrosion of the electrolyte to the battery shell 1 can be reduced, the service life of the battery shell 1 is prolonged, and the service life of the battery is prolonged. And the bonding layer 21 sets up the part that is not filled by seal structure 6 in annotating the liquid hole 3, fills up annotating the liquid hole 3 through bonding layer 21, and in addition, further fixes seal structure 6 in annotating the liquid hole 3, avoids seal structure 6 to deviate from in annotating the liquid hole 3 for electrolyte flows from annotating the liquid hole 3, guarantees the security of battery. The strength reinforcing structure 2 may be any of the strength reinforcing structures 2 shown in fig. 2 to 4. Of course, in other exemplary embodiments of the present disclosure, the sealing structure 6 may not be provided in the pouring spout 3, and the pouring spout 3 may be directly sealed by the adhesive layer 21.

Referring to fig. 7 and 8, an explosion-proof structure 4 is disposed on the battery case 1, specifically, an explosion-proof structure 4 is disposed on a cover plate 12 or a bottom plate 111 of the battery case 1, the explosion-proof structure 4 may be a weak structure disposed on the cover plate 12 or the bottom plate 111, after the battery cell is thermally out of control, high-temperature gas, sparks and high-temperature solid particles may burst the weak structure (the explosion-proof structure 4) on the battery case 1, and be ejected from the weak structure, thereby achieving the purpose of pressure relief and avoiding explosion of the battery.

The explosion-proof structure 4 may be a punched groove provided on the battery case 1, the punched groove being a groove formed by punching; the thickness of the battery shell 1 at the explosion-proof structure 4 is smaller than that of the battery shells 1 at other positions, so that high-temperature gas, sparks and high-temperature solid particles can be firstly burst and sprayed out of the explosion-proof structure 4, the purpose of pressure relief is achieved, and explosion of the battery is avoided. Of course, in other exemplary embodiments of the present disclosure, the explosion-proof structure 4 may be an etched groove provided on the battery case 1, and the etched groove is a groove formed by an etching process, which may be laser ablation or chemical etching.

The strength-enhancing structure 2 does not cover the explosion-proof structure 4, i.e. the adhesive layer 21 and the glass fiber cloth 22 or the adhesive layer 21, the resin layer 23 and the glass fiber cloth 22 do not cover the explosion-proof structure 4. Specifically, as shown in fig. 7, the adhesive layer 21 and the glass fiber cloth 22 or the adhesive layer 21, the resin layer 23, and the glass fiber cloth 22 may not cover the punching grooves or the etching grooves forming the explosion-proof structure 4, but cover the area of the inside surrounded by the punching grooves or the etching grooves. As shown in fig. 8, the adhesive layer 21 and the glass fiber cloth 22 or the adhesive layer 21, the resin layer 23, and the glass fiber cloth 22 may not cover the punching grooves or the etching grooves forming the explosion-proof structure 4 or may not cover the area around the punching grooves or the etching grooves. By the arrangement, shielding of the strength enhancement structure 2 to the explosion-proof structure 4 can be avoided, so that under the overheat condition of the battery, high-temperature gas, sparks and high-temperature solid particles can burst the explosion-proof structure 4, and explosion caused by the fact that the high-temperature gas, sparks and the high-temperature solid particles cannot burst the explosion-proof structure 4 of the battery is avoided.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

Claims

1. A battery, comprising:

an adhesive layer adhered to the outer surface of the battery case;

2. The battery according to claim 1, wherein the adhesive layer is an adhesive resin layer.

3. The battery of claim 1, wherein the strength enhancing structure further comprises:

and the resin layer is arranged between the glass fiber cloth and the bonding layer.

4. A battery according to any one of claims 1 to 3, wherein the battery case is provided with a liquid filling hole, and the strength enhancing structure covers the liquid filling hole.

5. The battery according to any one of claims 1 to 3, wherein the glass fiber cloth has a glass fiber filament diameter of 8 μm or more and 15 μm or less.

6. A battery according to any one of claims 1 to 3, wherein the strength enhancing structure further comprises:

and the protective layer is arranged on one side of the glass fiber cloth, which is away from the battery shell.

7. The battery according to claim 6, wherein the protective layer is a resin protective layer.

8. A battery according to any one of claims 1 to 3, wherein the battery case is a metal battery case, the battery case comprising:

a main body part having a housing chamber and an opening part communicating with the housing chamber;

and the cover plate is arranged at the opening part, and the strength enhancing structure is arranged at the outer surface of the main body part and/or the cover plate.

9. A battery according to any one of claims 1 to 3, wherein an explosion-proof structure is provided on the battery case, and the strength-enhancing structure does not cover the explosion-proof structure.

10. A battery according to any one of claims 1 to 3, wherein the battery is a cylindrical battery.