CN215070150U - High-capacity easy-to-radiate safe polymer lithium battery - Google Patents

Abstract

The application provides a high-capacity safe polymer lithium battery easy to dissipate heat. The high-capacity easy-heat-dissipation safe polymer lithium battery comprises a battery cell, a tab and an insulating and heat-insulating part, wherein the battery cell comprises a winding core and an aluminum-plastic packaging sleeve, the aluminum-plastic packaging sleeve comprises a sleeve body, a top sealing edge and two side sealing edges, the winding core is contained in the sleeve body, the side sealing edges are connected with the side surfaces of the sleeve body, the top sealing edge is connected with the top surface of the sleeve body, the top sealing edge comprises a sealing edge part and an end corner part, and the sealing edge part is attached to the sleeve body after being bent; the insulating heat insulation piece is attached to one side face, away from the sleeve body, of the sealing edge portion, the welding end of the lug bends and clamps the insulating heat insulation piece, and the end corner portion bends and then is attached to one side face, away from the sealing edge portion, of the insulating heat insulation piece. The utility model discloses a safe polymer lithium cell that high capacity easily dispels heat has solved the problem of the very easy bounce-back perk of end bight after buckling, makes the structure behind the battery package more firm stable, and then makes the structure of the safe polymer lithium cell that high capacity easily dispels heat more stable.

Description

High-capacity easy-to-radiate safe polymer lithium battery

Technical Field

The utility model relates to a battery technology field especially relates to a high capacity safety polymer lithium cell that easily dispels heat.

Background

In order to adapt to the development of various portable electronic products, the capacity of a polymer lithium battery needs to be increased, meanwhile, the volume of the lithium battery needs to be reduced, and the volume of a non-battery core part is required to be compressed as much as possible in the manufacturing process of the lithium battery; in addition, utmost point ear position department easily generates heat among the charge-discharge process, if these heats conduct in the electric core, lead to the heat accumulation in the electric core easily, the temperature of battery risees, makes utmost point ear calorific capacity sharply increase after easily leading to battery utmost point ear department resistance increase, and especially heavy current lithium cell aggravates and generates heat and can lead to battery plastic-aluminum membrane to melt or even explosion damage electronic equipment, is unfavorable for lithium cell safety work.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming among the prior art battery end bight and easily upwarping, utmost point ear generates heat and can lead to the weak point of influencing battery safety in the electric core, provides a high capacity safety polymer lithium cell that easily dispels heat.

The purpose of the utility model is realized through the following technical scheme:

a high-capacity safe polymer lithium battery easy to dissipate heat comprises a battery cell, an insulating heat-insulating piece and a tab.

The battery core comprises a winding core and an aluminum-plastic packaging sleeve, the aluminum-plastic packaging sleeve comprises a sleeve body, a top edge sealing and two side edge sealing, the winding core is accommodated in the sleeve body, the side edge sealing is connected with the side face of the sleeve body, the top edge sealing is connected with the top face of the sleeve body, the top edge sealing comprises an edge sealing part and an end corner part, and the edge sealing part is attached to the sleeve body after being bent.

The lug is electrically connected with the winding core, the lug penetrates through the sleeve body and is accommodated in the top edge sealing edge, and the welding end of the lug is exposed out of the edge sealing part of the top edge sealing edge.

The insulating and heat-insulating part is attached to one side face, far away from the sleeve body, of the sealing edge part, the welding end of the lug is bent and clamped with the insulating and heat-insulating part, and the end corner part is bent and then attached to one side face, far away from the sealing edge part, of the insulating and heat-insulating part.

In one embodiment, the welding end of the tab includes an upper bending end, a transition end and a lower bending end, a first bottom surface of the insulating and heat insulating member adjacent to the edge sealing portion is attached to the upper bending end, the transition end abuts against a first side surface of the insulating and heat insulating member, and a second bottom surface of the insulating and heat insulating member away from the upper bending end is attached to the lower bending end.

In one embodiment, the end of the lower bent end of the tab further comprises a terminal bent end, and the terminal bent end abuts against a second side surface of the insulating and heat insulating piece far away from the transition end.

In one embodiment, the upper bent end, the transition end and the lower bent end are integrally formed.

In one embodiment, the insulating and heat-insulating piece is provided with two insulating and heat-insulating bent ends, each insulating and heat-insulating bent end forms an included angle of 90 degrees with the main surface of the insulating and heat-insulating piece, and the two opposite main surfaces of the sleeve body are clamped and attached by the insulating and heat-insulating bent ends.

In one embodiment, an adhesive piece is arranged at the joint of the edge sealing part and the sleeve body.

In one embodiment, the joint position of the end corner part and the insulating and heat-insulating piece is provided with a bonding piece.

In one embodiment, the number of the tabs is two, and the planes of the welding ends of the two tabs are parallel to the plane of the insulating and heat-insulating piece.

In one embodiment, the adhesive is an insulating and heat insulating glue layer.

In one embodiment, the insulating and heat-insulating piece is of a bent sheet structure.

In one embodiment, the insulating and heat insulating piece is of a step-shaped structure, step parts are arranged at positions, corresponding to end corners, of two ends of the insulating and heat insulating piece, and the end corners are attached to the surfaces of the step parts.

Compared with the prior art, the utility model discloses polymer lithium cell has following advantage at least:

1. because the insulating heat-insulating part is attached to one side face, far away from the sleeve body, of the edge sealing part, and the bent end corner part is attached to the first side face, far away from the edge sealing part, of the insulating heat-insulating part, the edge sealing part is pressed below after the insulating heat-insulating part is attached to the sleeve body, and the edge sealing part is thoroughly isolated from the outside of the battery, so that the superposition of the rebound stress of the edge sealing part of the top edge sealing and the rebound stress of the end corner part is avoided, the problem that the end corner part is easy to rebound and tilt after being bent is solved, the structure of the battery after being packaged is firmer and more stable, and further the structure of the high-capacity easy-heat-dissipation safe polymer lithium battery is more stable;

2. the insulating heat-insulating piece is arranged between the upper sealed edge and the welding end of the lug, so that the heat conduction is effectively blocked, the heat generated at the lug is prevented from being led into the battery cell, most of the external heat of the insulating heat-insulating piece is directly dissipated to the outside of the battery, and the safety and the stability of the lithium battery are improved;

3. the aluminum-plastic packaging sleeve comprises a sleeve body, a top edge sealing and two side edge sealing, the side edge sealing is connected with the side face of the sleeve body, the top edge sealing is connected with the top face of the sleeve body, the top edge sealing comprises a sealing edge part and an end corner part, the sealing edge part is attached to the sleeve body after being bent, namely, the useless top edge sealing is bent, the size of an electric core of the polymer lithium battery is reduced, the size of the polymer lithium battery is further reduced, and the energy density of the polymer lithium battery is indirectly improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic diagram of a high capacity, easy to dissipate heat safe polymer lithium battery in one embodiment;

FIG. 2 is a schematic diagram of another view of the high capacity, heat-dissipating polymer lithium battery of FIG. 1;

fig. 3 is a sectional view taken along line a-a of the high capacity, heat-dissipation facilitating safe polymer lithium battery shown in fig. 2;

fig. 4 is a partial cross-sectional view of the high capacity, heat-dissipating safe polymer lithium battery of fig. 1;

fig. 5 is another schematic partial cross-sectional view of the high capacity, heat-dissipating safety polymer lithium battery of fig. 1;

fig. 6 is a schematic view of another perspective view of the high capacity and heat dissipation facilitating safe polymer lithium battery shown in fig. 1.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different 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.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1 to 3, an embodiment of a high-capacity, heat-dissipation-susceptible safety lithium polymer battery 10 includes a battery cell 100, a tab 200, and an insulating member 300. The battery cell 100 includes a winding core 110 and an aluminum-plastic package cover 120, the aluminum-plastic package cover 120 includes a cover body 122, a top sealing edge 126 and two side sealing edges 124, the winding core 110 is accommodated in the cover body 122, the side sealing edges 124 are connected with the side surfaces of the cover body 122, and the top sealing edge 126 is connected with the top surface of the cover body 122. The top seal 126 includes a seal edge 126a and an end corner 126b, and the seal edge 126a is bent to fit the jacket 122. In this embodiment, two side seals 124 are correspondingly connected to two side surfaces of the sheath body 122, and a top seal 126 is correspondingly connected to the top surface of the sheath body 122.

As shown in fig. 4 and 5, the tab 200 is electrically connected to the winding core 110, the tab 200 is inserted through the sheath 122, and the tab 200 is received in the top sealed edge 126. The welding end 210 of the tab 200 is exposed outside the edge sealing part 126a of the top sealing edge 126, the welding end 210 of the tab 200 is bent and clamps the insulating and heat insulating member 300, and the end corner part 110 is bent and attached to one side of the insulating and heat insulating member 300 away from the edge sealing part 126 a. The edge heat insulation piece is attached to one side face, far away from the sleeve body, of the edge sealing part.

Foretell high capacity safety polymer lithium cell that easily dispels heat, because insulating heat insulation piece laminates in the one side that the cover body was kept away from to the contained edge portion, and the first side laminating of the contained edge portion was kept away from to the contained edge portion with insulating heat insulation piece after the end bight is buckled, avoided the stack of the rebound stress of the contained edge portion of top banding and the rebound stress of end bight, solved the problem that the end bight is buckled and is rebounded the perk very easily after, and then make the structure of high capacity safety polymer lithium cell that easily dispels heat more stable. Because the insulating heat insulation piece is arranged between the upper sealed edge and the welding end of the lug, and the heat dissipation of the outside of the insulating heat insulation piece is good, the heat generated at the lug is prevented from being conducted into the battery cell, and the safety and the stability of the polymer lithium battery are improved. Because the aluminum-plastic packaging sleeve comprises a sleeve body, a top sealing edge and two side sealing edges, the side sealing edges are connected with the side faces of the sleeve body, the top sealing edge is connected with the top face of the sleeve body, the top sealing edge comprises a sealing edge part and an end corner part, the sealing edge part is attached to the sleeve body after being bent, namely, the useless top sealing edge is bent, the size of an electric core of the polymer lithium battery is reduced, the size of the polymer lithium battery is further reduced, and the energy density of the polymer lithium battery is indirectly improved.

As shown in fig. 4 and 5, in one embodiment, the welding end 210 of the tab 200 is exposed outside the sealing edge portion 126a of the top sealing edge 126, the welding end 210 of the tab 200 includes an upper bent end 210a, a transition end 210b and a lower bent end 210c, a first bottom surface of the insulating member 300 adjacent to the sealing edge portion is attached to the upper bent end 210a, the transition end 210b abuts against a first side surface of the insulating member 300, and a second bottom surface of the insulating member 300 away from the upper bent end 210a is attached to the lower bent end 210c, so that the insulating member is attached to one side surface, and the welding end of the tab is bent and holds the insulating member better, so that the insulating member is attached to the top surface of the bushing body more firmly.

As shown in fig. 3 to 5, in one embodiment, the end of the lower bent end 210c of the tab 200 further includes a bent end 210d, the bent end 210d of the tab 200 abuts against the second side of the thermal insulation member 300 away from the transition end 210b, and the first side of the thermal insulation member 300 abuts against the transition end 210b of the thermal insulation member 300, so that the thermal insulation member 300 is restrained and positioned in a direction perpendicular to the first side and the second side, and the tab 200 is clamped to the thermal insulation member 300 more firmly.

As shown in fig. 4 and 5, in one embodiment, the upper bent end 210a, the transition end 210b and the lower bent end 210c of the tab 200 are integrally formed, so that the upper bent end 210a, the transition end 210b and the lower bent end 210c are firmly connected to one body, thereby increasing the electrical conductivity of the tab 200, and simultaneously enabling the heat of the tab 200 to be more quickly conducted to the insulating and heat-insulating member 300, and the insulating and heat-insulating member 300 can quickly release the heat introduced into the tab 200 outwards, which helps to improve the heat dissipation performance of the lithium polymer battery 10. In other embodiments, the upper bent end 210a, the transition end 210b and the lower bent end 210c of the tab 200 are not limited to being integrally formed, and the upper bent end 210a, the transition end 210b and the lower bent end 210c of the tab 200 may also be formed separately and fixedly connected to one after being formed. Specifically, the upper bent end 210a, the transition end 210b and the lower bent end 210c of the tab 200 are welded together.

In one embodiment, the edge of the welding end 210 of the tab 200 is in a zigzag structure, so that the heat dissipation area of the edge of the welding end 210 is increased, and the heat release of the welding end 210 is facilitated.

As shown in fig. 4 and 5, in one embodiment, an adhesive 400 is disposed at a position where the end corner 126b is attached to the insulating material 300, and the end corner 126b and the insulating material 300 are adhered together by the adhesive 400, so that the adhesive 400 has a better constraint effect on the resilience of the end corner 126b relative to the insulating material 300, thereby avoiding the problem that the end corner 126b is easily rebounded and separated from the insulating material 300, and further, the end corner 126b and the insulating material 300 are firmly fixed together.

As shown in fig. 4 and 5, in one embodiment, the adhesive member 400 is an insulating adhesive layer, so that the end corner 126b and the insulating member 300 are more firmly fixed together, thereby improving the structural stability of the lithium polymer battery. In this embodiment, the adhesive member 400 is not adhered with an adhesive layer, so that the adhesive member 400 has better insulating and heat-insulating properties.

As shown in fig. 6, in one embodiment, the thermal insulation member 300 has two thermal insulation bent ends 330, the two thermal insulation bent ends 330 form an included angle of 90 degrees with the main surface of the thermal insulation member 300, and the two thermal insulation bent ends 330 respectively clamp and attach to the two opposite main surfaces of the sheath body 122, so that the two thermal insulation bent ends 330 are firmly clamped with the two main surfaces of the sheath body 122. Further, the distance between the two heat insulation bent ends 330 is smaller than the thickness between the two main surfaces of the sheath body 122, and the two heat insulation bent ends 330 are in interference fit with the two main surfaces of the sheath body 122, so that the two heat insulation bent ends 330 and the two main surfaces of the sheath body 122 are firmly clamped, and the heat insulation sheet 300 and the sheath body 122 are stably and reliably fixed.

As shown in fig. 3 to 5, in one embodiment, the number of the tabs 200 is two, the plane of the welding end of the two tabs 200 is parallel to the plane of the insulating and heat-insulating member 300, and a stable surface fit is formed between the two tabs 200 and the two insulating and heat-insulating members 300, so that the friction between the two tabs 200 and the insulating and heat-insulating members 300 is large, the insulating and heat-insulating members 300 are not easily separated from the clamping of the tabs 200, and the connection between the insulating and heat-insulating members 300 and the tabs 200 is firmer.

In one embodiment, as shown in fig. 3 to 5, the thermal insulation member 300 is a bent sheet structure, the thermal insulation member 300 includes a first bent end 310 and a second bent end 320, and the second bent end 320 is bent 180 degrees relative to the first bent end 310, so that the thermal insulation member 300 is better clamped on the top surface of the sheath 122. Further, the width of the second bending end 320 is half of the width of the first bending end 310, and the end of the second bending end 320 is inserted into the gap between the edge sealing portion 126a of the top sealing edge 126 and the sheath body 122, so that the edge sealing portion 126a has a better interference clamping effect on the second bending end 320 of the insulating member 300, and further the fastening force between the insulating member 300 and the sheath body 122 is larger, so that the insulating member 300 cannot fall off from the sheath body 122, and further the combination between the insulating member 300 and the sheath body 122 is more stable.

As shown in fig. 3 to 5, in one embodiment, the insulating member 300 has a step-shaped structure, step portions 320 are disposed at two ends of the insulating member 300 corresponding to the end corners 126b, and the end corners 126b are attached to the surface of the step portions 320. In one embodiment, the height of the surface of the step portion 320 is lower than the height of the side of the insulating member 300 away from the edge sealing portion 126a, and the end corner portion 126b is flush with the step portion 320.

It should be noted that, when the height distance between the surface of the step portion 320 and the side of the insulating and insulating member 300 far from the edge sealing portion 126a is greater than the thickness of the end corner portion 126b, the end corner portion 126b is attached to the step portion 320 of the insulating and insulating member 300, the surface height of the end corner portion 126b is lower than the height of the outer surface of the insulating and insulating member 300, and the two upper corners of the battery 10 are flat and right-angled structures, the battery 10 is more convenient and faster to assemble with the electronic product with a housing, so that the battery 10 is inherently more convenient to assemble and use.

In one embodiment, the insulating member 300 is a single-layer structure or a multi-layer composite structure. In the present embodiment, the insulating material 300 is a single-layer material structure, and the single-layer material used for the insulating material 300 has both insulating and heat-insulating properties, for example, the insulating material 300 is heat-insulating paper or quartz sheet or ceramic sheet with insulating and heat-insulating properties.

In other embodiments, the insulating member 300 is a multi-layer composite material structure, that is, the insulating member 300 is made of a multi-layer composite material, the multi-layer composite material has at least one heat conducting layer and one insulating layer, and one heat conducting layer and one insulating layer are respectively disposed on the outer side of the multi-layer composite material. In the present embodiment, the multi-layer composite material has a two-layer structure, the heat-conducting layer can be made of various metals, such as copper, aluminum, alloy, and the like, and the insulation layer can be made of various plastics, such as plastic, rubber, glass, ceramic, and the like.

Further, the multi-layer composite material has a two-layer structure, the insulating layer on one side is made of plastic, such as ABS, the heat conducting layer on the other side is made of metal, such as copper, the side of the plastic layer of the insulating and heat insulating member 300 faces the edge sealing portion 126a of the sheath 122 and is attached to the edge sealing portion 126a, and the heat conducting layer is welded to the welding end 210 of the tab 200. it should be noted that, when the conductive metal is used as the heat conducting layer, a separating groove is formed in the center of the heat conducting layer along the direction perpendicular to the long axis of the insulating and heat insulating member, the separating groove divides the heat conducting layer into two conductive regions which are not conductive, respectively a first conductive region and a second conductive region, and the two tabs 200 are electrically connected to the first conductive region and the second conductive region, respectively.

In one embodiment, the insulating layer of the insulating member 300 may also be made of a non-setting adhesive material layer, so that the insulating layer has better adhesion and facilitates the fixing of the insulating member 300 to the edge sealing portion 126a of the sheath 122.

In one embodiment, a fixing layer is disposed on one side surface of the welding terminal 210 contacting the insulating thermal barrier 300. In this embodiment, the fixing layer is a layer structure for increasing friction, and may be a parallel sawtooth-pattern layer structure or a raised particle-pattern layer structure, so that after the welding end 210 is pressed against the insulating and heat-insulating member 300, the friction force between the welding end and the insulating and heat-insulating member 300 can firmly fix the insulating and heat-insulating member 300 in the surface direction of the insulating and heat-insulating member 300, and the insulating and heat-insulating member 300 is further less likely to move on the surface attached to the sleeve 122.

In one embodiment, the bending line of the end corner 126b is further provided with a plurality of bending creases to prevent the end corner 126b from rebounding under the action of a rebound force after being bent to be attached to the upper surface of the sheath body 122, and the plurality of bending creases are provided along the bending line of the end corner 126b to help eliminate the stress of the rebounding bending of the end corner 126b, so that the tendency of rebounding of the end corner 126b is reduced, the end corner 126b is less prone to rebounding by itself, and the attaching firmness of the end corner 126b of the battery and the upper surface of the sheath body 122 is increased.

In one embodiment, a heat-resistant structure is provided between the welding ends 210 of the two tabs 200 and the sheath body 122. The heat-resistant structure between the welding ends 210 of the two tabs 100 and the sleeve body 122 is a circuit structure which is formed by various extending conductive circuits and continuously bending, the resistance of the continuously bending structure is increased extremely little, but the continuously bending structure has great influence on the heat conductivity, so that the heat at the welding ends 210 can be prevented from being conducted into the polymer lithium battery 10, and the temperature rise in the polymer lithium battery is avoided.

Compared with the prior art, the utility model discloses polymer lithium cell 10 has following advantage at least:

1. the insulating heat-insulating part is attached to one side face, away from the sleeve body, of the edge sealing part, the end corner part is attached to the first side face, away from the edge sealing part, of the insulating heat-insulating part after being bent, the edge sealing part is pressed below after the insulating heat-insulating part is attached to the sleeve body, and the edge sealing part is thoroughly isolated from the outside of the battery, so that the superposition of the rebound stress of the edge sealing part of the top edge sealing and the rebound stress of the end corner part is avoided, the problem that the end corner part is easy to rebound and tilt after being bent is solved, the structure of the battery after being packaged is firmer and more stable, and the structure of the high-capacity easy-heat-dissipation safe polymer lithium battery is more stable;

2. the insulating heat-insulating piece is arranged between the upper sealed edge and the welding end of the lug, so that the heat conduction is effectively blocked, the heat generated at the lug is prevented from being led into the battery cell, most of the external heat of the insulating heat-insulating piece is directly dissipated to the outside of the battery, and the safety and the stability of the lithium battery are improved;

3. the aluminum-plastic packaging sleeve comprises a sleeve body, a top edge sealing and two side edge sealing, the side edge sealing is connected with the side face of the sleeve body, the top edge sealing is connected with the top face of the sleeve body, the top edge sealing comprises a sealing edge part and an end corner part, the sealing edge part is attached to the sleeve body after being bent, namely, the useless top edge sealing is bent, the size of an electric core of the polymer lithium battery is reduced, the size of the polymer lithium battery is further reduced, and the energy density of the polymer lithium battery is indirectly improved.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. The utility model provides a safe polymer lithium cell of easy heat dissipation of high capacity, includes electric core, utmost point ear and insulating heat insulating part, its characterized in that:

the battery cell comprises a winding core and an aluminum-plastic packaging sleeve, the aluminum-plastic packaging sleeve comprises a sleeve body, a top sealing edge and two side sealing edges, the winding core is accommodated in the sleeve body, the side sealing edges are connected with the side surface of the sleeve body, the top sealing edge is connected with the top surface of the sleeve body, the top sealing edge comprises a sealing edge part and an end corner part, and the sealing edge part is attached to the sleeve body after being bent;

the lug is electrically connected with the winding core, the lug penetrates through the sleeve body and is accommodated in the top edge sealing edge, and the welding end of the lug is exposed out of the edge sealing part of the top edge sealing edge;

the insulating and heat-insulating part is attached to one side face, far away from the sleeve body, of the sealing edge part, the welding end of the lug is bent and clamped with the insulating and heat-insulating part, and the end corner part is bent and then attached to one side face, far away from the sealing edge part, of the insulating and heat-insulating part.

2. The high capacity safety polymer lithium battery of claim 1, wherein the welded ends of the tabs include an upper bent end, a transition end and a lower bent end, a first bottom surface of the insulating and heat insulating member adjacent to the edge sealing portion is attached to the upper bent end, the transition end abuts against a first side surface of the insulating and heat insulating member, and a second bottom surface of the insulating and heat insulating member away from the upper bent end is attached to the lower bent end.

3. The high capacity, easy to dissipate heat, safe lithium polymer battery of claim 2 wherein the end of the lower bent end of the tab further comprises a terminal bent end that abuts against a second side of the insulating thermal barrier away from the transition end.

4. The high capacity, easy heat dissipation, safe polymer lithium battery of claim 2, wherein the bent up end, the transition end, and the bent down end are integrally formed.

5. The high capacity, easy heat dissipation, safe polymer lithium battery of claim 4, wherein the insulating member has two insulating bent ends, each of the two insulating bent ends forming a 90 degree angle with the major surface of the insulating member, the insulating bent ends clamping and adhering to two opposite major surfaces of the sheath.

6. The high capacity, easy heat dissipation, safe polymer lithium battery as claimed in claim 5, wherein an adhesive member is provided at a position where the end corner portion is attached to the insulating member.

7. The high capacity, easy heat dissipation, safe lithium polymer battery as claimed in claim 6, wherein the number of the tabs is two, and the plane of the welding ends of the two tabs is parallel to the plane of the insulating and heat-insulating member.

8. The high capacity, easy to dissipate heat, safe polymer lithium battery of claim 7 wherein the adhesive is a layer of insulating glue.

9. The high capacity, heat-dissipating safety polymer lithium battery as claimed in any one of claims 1 to 8, wherein the insulating thermal insulator has a bent sheet structure.

10. The high-capacity easy-heat-dissipation safe polymer lithium battery as claimed in any one of claims 1 to 8, wherein the insulating and heat-insulating member has a step-shaped structure, step portions are provided at positions corresponding to end corners at both ends of the insulating and heat-insulating member, and the end corners are attached to surfaces of the step portions.

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