Mold core for improving loose skin and corner collapse of laminated battery

Abstract

The utility model provides a mold core for improving loose skin and corner collapse of a laminated battery, which belongs to the technical field of new energy and energy conservation and comprises a mold core body, a fixing hole penetrates through the surface of the mold core body, a slope surface is arranged at a position on the mold core body corresponding to a thinner position of a battery pole group, and the slope surface is provided with an inclined surface. The slope surface ensures that the thickness of the position, corresponding to the thinner position of the battery pole group, on the stamped shell is matched with the thickness of the battery pole group, so that the phenomena of skin loosening and corner collapse of the shell after hot pressing formation can be obviously improved, and the product texture is improved; and a large amount of electrolyte is prevented from being accumulated at the position, so that the position is prevented from being softened due to electrolyte soaking, and the cycle performance is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to new energy and energy -conserving technical field, concretely relates to a mould core that improves laminated battery loose skin angle. BACKGROUND

[0002] At present, the manufacturing method of lithium ion battery mainly has two kinds of winding type and laminated type. Among them, the laminated lithium ion battery needs to cut the positive and negative pole piece into the single piece of required size during manufacturing, then the diaphragm is Z type winding, and the positive and negative single piece is crossed and stacked in turn, and the diaphragm is separated in the middle. Or the positive pole piece, diaphragm and negative pole piece are inserted and stacked in turn and connected to form a battery module.

[0003] At present, the pole piece cutting link mainly adopts two kinds of die punching and laser cutting, and the pole piece processed by the two kinds of ways needs to have the current collector tab. Based on this, when the coating device is used to coat the pole piece, there will be a thinning area on the edge position of the coated pole piece close to the current collector, and it can gradually transition to the normal thickness area from the edge of the material area about 10mm inward. And when it is laminated, these thinning areas will form an obviously thin area after layer-by-layer accumulation.

[0004] Under this condition, since the conventional mold core is a structure with uniform thickness, and the upper part is a plane, when the shell punched by such mold core is matched with the laminated battery cell, the above-mentioned thin position will have obvious gap with the shell, so that the loose skin angle appearance problem will occur after hot pressing formation, which seriously affects the appearance quality of the product. At the same time, a large amount of electrolyte is also easy to accumulate at the thin position, which makes this area soft, and further leads to poor battery cycle performance, reduces the service life and reliability of the battery. UTILITY MODEL CONTENTS

[0005] The utility model aims at the defect that the existing laminated battery is easy to appear loose skin angle phenomenon after hot pressing formation, proposes and designs a mold core for improving the loose skin angle of laminated battery, and can obviously improve the loose skin angle phenomenon of the shell after hot pressing formation, so as to make the battery appearance more beautiful and improve the product texture.

[0006] In order to achieve the above object, the utility model provides a technical scheme for: a kind of mould core for improving laminated battery loose skin collapse, it includes mould core body, fixed hole is passed through the surface of mould core body, and the position corresponding with the position of battery pole group thinning of mould core body is provided with slope face, and the thickness of the position corresponding with the position of battery pole group thinning of shell punched out by the slope face is guaranteed to match the thickness of battery pole group, so as to guarantee that shell loose skin collapse phenomenon after hot-pressing formation can be obviously improved, battery appearance is more beautiful, and then product texture is improved;Meanwhile, it can also be adjusted the thickness of the position corresponding with the position of battery pole group thinning of shell punched out, avoid a large amount of electrolyte accumulation at this position, so as to avoid the position to appear softening phenomenon due to electrolyte soaking, and then improve cycle performance.

[0007] Further, the surface of the mould core body is provided with exhaust holes, and the exhaust holes are used to ensure that the mould core body can perform exhaust action during shell punching demoulding, so as to prevent shell deformation.

[0008] Further, the shape of the mould core body is L-shaped, and the inner corner position of the transverse section and the longitudinal section of the mould core body is provided with a circular arc groove, and the end of the longitudinal section of the mould core body away from the transverse section is provided with a slope face.

[0009] Further, the middle part of the transverse section of the mould core body is provided with a fixed hole, and the left and right sides of the fixed hole are provided with exhaust holes, and the number of exhaust holes on the left and right sides of the fixed hole of the transverse section of the mould core body can be flexibly selected according to the length of the transverse section.

[0010] Further, the middle part of the longitudinal section of the mould core body is provided with a fixed hole, and the front and back sides of the fixed hole are provided with exhaust holes, and the longitudinal section of the mould core body is provided with one exhaust hole on the front and back sides of the fixed hole.

[0011] Further, the fixed hole is a stepped hole, and the mould core body can be installed on the base of shell punching equipment through a bolt installed in the stepped hole, so that the mould core body can perform shell punching action under the action of driving members such as air cylinder and motor.

[0012] From the above technical scheme, the utility model has the following advantages:

[0013] The utility model can guarantee that the thickness of the position corresponding with the position of battery pole group thinning of shell punched out matches the thickness of battery pole group through slope face, so as to guarantee that shell loose skin collapse phenomenon after hot-pressing formation can be obviously improved, battery appearance is more beautiful, and then product texture is improved;It can also be adjusted the thickness of the position corresponding with the position of battery pole group thinning of shell punched out, avoid a large amount of electrolyte accumulation at this position, so as to avoid the position to appear softening phenomenon due to electrolyte soaking, and then improve cycle performance. Attached Figure Description

[0014] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a top view of a specific embodiment of the present utility model;

[0016] Figure 2 This is a side view of a specific embodiment of the present utility model.

[0017] In the diagram: 1. Sloping surface; 2. Vent hole; 3. Fixing hole; 4. Mold core body. Detailed Implementation

[0018] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0019] like Figure 1 , Figure 2 As shown, this utility model provides a mold core for improving the loose and collapsed corners of stacked batteries. It includes a mold core body 4, which is L-shaped. Arc grooves are provided at the inner corners of the transverse and longitudinal sections of the mold core body 4. A slope surface 1 is provided at one end of the longitudinal section away from the transverse section, and the slope and length of the slope surface 1 are consistent with the dimensions of the thinner portion of the battery electrode assembly. This slope surface 1 ensures that the thickness of the stamped casing at the position corresponding to the thinner portion of the battery electrode assembly matches the thickness of the battery electrode assembly. This significantly improves the loose and collapsed corner phenomenon of the casing after hot pressing, resulting in a more aesthetically pleasing battery appearance and enhanced product quality. Furthermore, it prevents excessive electrolyte accumulation at this location, thus avoiding softening due to electrolyte immersion and improving cycle performance.

[0020] The middle part of the transverse section of the mold core body 4 and the middle part of the longitudinal section of the mold core body 4 are provided with fixing holes 3, which are stepped holes, and the mold core body 4 can be installed on the base of the shell punching equipment through bolts installed in the stepped holes, so that the mold core body 4 can follow the base to perform the shell punching action under the action of driving members such as cylinders and motors.

[0021] In addition, the utility model also is equipped with exhaust hole 2 on the left and right sides of the fixing hole 3 of the transverse section of the mold core body 4, and is equipped with exhaust hole 2 on the front and rear sides of the fixing hole 3 of the longitudinal section of the mold core body 4, and through the exhaust hole 2, it can perform the exhaust action in the shell punching demolding process, to prevent the deformation of the shell.

[0022] The above description of disclosed embodiments enables those skilled in the art to carry out or use the utility model. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the utility model. Therefore, the utility model will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A mold core for improving the swelling and collapsing of a jelly-roll battery, comprising a mold core body, a fixing hole being formed through a surface of the mold core body, characterized in that, The inclined surface is arranged on the die core body at a position corresponding to the thin position of the battery pole group.

2. The core for improving the jelly rolling of a jelly-roll battery of claim 1, wherein, The surface of the die core body is penetrated by exhaust holes.

3. The core for improving the jelly rolling of a jelly-roll battery of claim 1, wherein, The die core body is L-shaped, and a circular arc groove is arranged at the inner corner position of the transverse section and the longitudinal section of the die core body, and an inclined surface is arranged at the end of the longitudinal section of the die core body away from the transverse section.

4. The core for improving the jelly rolling of a jelly-roll battery of claim 3, wherein, The middle part of the transverse section of the die core body is provided with a fixing hole, and the left and right sides of the fixing hole are provided with exhaust holes.

5. The core for improving the jelly rolling of a jelly-roll battery of claim 3, wherein, The middle part of the longitudinal section of the die core body is provided with a fixing hole, and the front and rear sides of the fixing hole are provided with exhaust holes.

6. The core for improving the jelly rolling of a jelly-roll battery of any one of claims 1 to 5, wherein The fixing hole is a stepped hole.

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