阅读说明：本技术 一种纽扣电池折边方法 (Button cell edge folding method ) 是由 周玲 曹礼 李雄成 钟欣 于 2021-08-30 设计创作，主要内容包括：本发明属于电池制造技术领域,尤其涉及一种纽扣电池折边方法,包括以下步骤：S1、对电芯封印边加热进行封边预热；S2、对电芯封印边加热进行折边处理；S3、对电芯封印边进行降温冷压定型。本发明的一种纽扣电池折边方法,有效解决折边后反弹现象,降低电芯卷径的波动,从而避免电芯超宽现象。(The invention belongs to the technical field of battery manufacturing, and particularly relates to a button battery edge folding method which comprises the following steps: s1, heating the sealing edge of the battery cell for sealing and preheating; s2, heating the battery cell seal edge to perform edge folding treatment; s3, cooling and cold-pressing the battery core seal edge. The button battery edge folding method provided by the invention effectively solves the problem of rebound after edge folding, and reduces the fluctuation of the winding diameter of the battery cell, thereby avoiding the phenomenon of super-wide battery cell.)

1. A button cell edge folding method is characterized by comprising the following steps:

s1, heating the sealing edge of the battery cell for sealing and preheating;

s2, heating the battery cell seal edge to perform edge folding treatment;

s3, cooling and cold-pressing the battery core seal edge.

2. The button cell folding method according to claim 1, wherein the temperature for preheating the sealing edge in the step S1 is 100-120 ℃.

3. The button cell folding method according to claim 1, wherein the heating temperature in step S2 is 100 to 120 ℃, the folding pressure is 0.3 ± 0.15mpa, and the folding time is 3 to 5 seconds.

4. The button cell folding method according to claim 1, wherein the temperature of the cold pressing in the step S3 is 25-45 ℃, the pressure of the cold pressing is 0.3 +/-0.15 mpa, and the time for cold pressing and shaping is 5-20 seconds.

5. The button cell folding method according to claim 1, wherein the material of the seal edge is an aluminum plastic film.

6. The button cell folding method according to claim 1, wherein in the step S2, the folding process is to fold the cell sealing edge towards the cell main body to form a texture.

7. The button cell flanging method according to claim 1, wherein the edge sealing preheating time is 3-10 seconds.

8. The button cell folding method according to claim 1, wherein the step S3 of cold-pressing and shaping by cooling is performed within 0.1-1 second after the folding treatment of the step S2.

Technical Field

The invention belongs to the technical field of battery manufacturing, and particularly relates to a button battery edge folding method.

Background

Soft-packaged button is heated through plastic-aluminum membrane PP and fuses the completion encapsulation, and footpath is rolled up for better control electric core, and electric core degassing encapsulation back needs roll over the shirt rim to electric core banding and handles, and the skirt rim technology adopts hot blank pressing to roll over the tradition, and hot hem mode goes on, and the bounce-back phenomenon easily appears in electric core shirt rim behind the hem, leads to electric core to roll up footpath undulant big, appears super wide phenomenon even, so need a technical scheme who solves above-mentioned problem urgently.

Disclosure of Invention

The invention aims to: aiming at the defects of the prior art, the button cell edge folding method is provided, the problem of rebound after edge folding is effectively solved, the fluctuation of the winding diameter of the battery cell is reduced, and the phenomenon of super-width of the battery cell is avoided.

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

a button cell edge folding method comprises the following steps:

s1, heating the sealing edge of the battery cell for sealing and preheating;

s2, heating the battery cell seal edge to perform edge folding treatment;

s3, cooling and cold-pressing the battery core seal edge.

According to the invention, the hot folding edge and the cold-stamping edge are combined, the hot folding edge enables the sealing edge of the battery cell to be bent and shaped better, and the cold-stamping edge is used for shaping after shaping, so that the flanging rebound of the battery cell can be effectively avoided, and the phenomenon of super-width of the battery cell is avoided.

As an improvement of the button cell edge folding method, the temperature for preheating the edge sealing in the step S1 is 100-120 ℃. And sealing and preheating are carried out to soften the sealing edge, so that the subsequent edge folding operation is facilitated. The preheating temperature cannot be too high, so that the sealing edge is easy to be pasted, and the preheating temperature cannot be too low, otherwise, the sealing edge cannot be softened. The edge sealing preheating time and the edge folding processing time cannot be too long, otherwise, the voltage of the cell sealing edge is easy to change in a heating state, and the quality of the cell is affected.

As an improvement of the button cell edge folding method, in the step S2, the heating temperature is 100-120 ℃, the edge folding pressure is 0.3 +/-0.15 mpa, and the edge folding time is 3-5 seconds.

As an improvement of the button cell edge folding method, in the step S3, the cold pressing temperature is 25-45 ℃, the cold pressing pressure is 0.3 +/-0.15 mpa, and the cold pressing and shaping time is 5-20 seconds. The edge folding method of the invention has simple operation, can realize mass production, has short time, high production efficiency and quality and can not cause edge folding to rebound.

As an improvement of the button cell edge folding method, the seal edge is made of an aluminum plastic film. Compared with the traditional steel shell, the aluminum-plastic film has light weight and good plasticity.

As an improvement of the button cell folding method of the present invention, in the step S2, the folding process is to fold the cell sealing edge toward the cell main body to form a vein shape. When bending, the sealing edge is close to the cell main body, and can also be close to the cell main body in sequence from top to bottom to form skirt line.

As an improvement of the button cell edge folding method, the edge sealing preheating time is 3-10 seconds. The preheating time of limited seal limit avoids preheating for a long time and leads to the seal limit too soft, also avoids preheating time too short, and the seal limit influences the hem effect too hard. Preferably, the edge sealing preheating time is 5-8 seconds.

As an improvement of the button cell edge folding method, the step S3 of cooling, cold pressing and shaping are carried out within 0.1-1 second after the edge folding treatment of the step S2. The interval time between the flanging treatment in the step S2 and the cooling and cold-pressing shaping in the step S3 has great influence on the cold-pressing shaping effect, and the shorter the interval time is, the better the effect is after the cold-pressing shaping is.

Compared with the prior art, the invention has the beneficial effects that: the button battery edge folding method can effectively solve the problem of rebound after edge folding, and reduce the fluctuation of the winding diameter of the battery cell, thereby avoiding the phenomenon of super-wide battery cell. The hot folding is to soften the aluminum plastic film, better shape the skirt edge, and rapidly cool the skirt edge after the shaping is finished, so that the skirt edge can be better shaped. According to the invention, hot edge folding shaping is selected, so that the damage of the edge folding of the battery core caused by the fact that the aluminum plastic film is too hard can be avoided, cold-temperature edge ironing shaping is adopted immediately after hot edge folding, and cold-heat alternate combination is adopted, so that edge folding shaping can be facilitated, and edge folding rebound can be avoided.

Drawings

Fig. 1 is a schematic structural diagram of a top view angle and a front view angle of a folded battery cell of the invention.

Fig. 2 is a schematic structural diagram of a top view angle and a front view angle before cell folding.

Fig. 3 is a data comparison graph of the diameter of the folded cell, the diameter of the folded cell after being placed for 1 day, and the diameter of the folded cell after being placed for 3 days.

FIG. 4 is a graph comparing the diameter of the prior art after crimping, the diameter of the prior art after 1 day of standing, and the diameter of the prior art after 3 days of standing.

Wherein: 1. a cell main body; 2. and sealing edges.

Detailed Description

The present invention will be described in further detail with reference to the following detailed description and the accompanying drawings, but the embodiments of the invention are not limited thereto.

Example 1

A button cell edge folding method comprises the following steps:

s1, heating the battery cell sealing edge 2 to seal and preheat, as shown in FIG. 2;

s2, heating the battery cell sealing edge 2 for flanging, as shown in figure 1;

s3, cooling, cold pressing and shaping the battery core seal edge 2.

According to the invention, the hot folding edge and the cold-stamping edge are combined, the hot folding edge enables the battery cell sealing edge 2 to be bent and shaped better, and the cold-stamping edge is used for shaping after shaping, so that the battery cell folding edge can be effectively prevented from rebounding, and the phenomenon that the battery cell is over-wide can be avoided.

In step S1, the sealing preheating temperature is 100 ℃, and the sealing preheating time is 10 seconds.

Wherein the heating temperature in the step S2 is 100 ℃, the pressure of the hemming treatment is 0.3mpa, and the hemming treatment time is 5 seconds.

Wherein the temperature of the cold pressing in the step S3 is 25 ℃, the pressure of the cold pressing is 0.3mpa, and the time of the cold pressing and the shaping is 5 seconds.

The sealing edge 2 is made of an aluminum-plastic film.

In step S2, the folding process is to form a texture by approaching the cell sealing edge 2 to the cell main body 1.

And S3 cooling and cold pressing for shaping are carried out within 0.1 second after the edge folding processing in the step S2.

Example 2

A button cell edge folding method comprises the following steps:

s1, heating the battery cell sealing edge 2 to seal and preheat, wherein the sealing and preheating time is 5 seconds;

s2, heating the battery cell sealing edge 2 for edge folding;

s3, cooling, cold pressing and shaping the battery core seal edge 2.

Wherein the edge sealing preheating temperature in the step S1 is 110 ℃.

Wherein the heating temperature in the step S2 is 110 ℃, the pressure of the hemming treatment is 0.45mpa, and the hemming treatment time is 4 seconds.

Wherein the temperature of the cold pressing in the step S3 is 30 ℃, the pressure of the cold pressing is 0.45mpa, and the time of the cold pressing and the shaping is 20 seconds.

The sealing edge 2 is made of an aluminum-plastic film.

In step S2, the folding process is to form a texture by approaching the cell sealing edge 2 to the cell main body 1.

And S3 cooling and cold pressing for shaping are carried out within 0.5 second after the edge folding processing in the step S2.

Example 3

A button cell edge folding method comprises the following steps:

s1, heating the battery cell sealing edge 2 to seal and preheat, wherein the sealing and preheating time is 8 seconds;

s2, heating the battery cell sealing edge 2 for edge folding;

s3, cooling, cold pressing and shaping the battery core seal edge 2.

Wherein the edge sealing preheating temperature in the step S1 is 115 ℃.

Wherein the heating temperature in the step S2 is 115 ℃, the pressure of the hemming treatment is 0.15mpa, and the hemming treatment time is 4 seconds.

Wherein the temperature of the cold pressing in the step S3 is 28 ℃, the pressure of the cold pressing is 0.15mpa, and the time of the cold pressing and shaping is 16 seconds.

The sealing edge 2 is made of an aluminum-plastic film.

In step S2, the folding process is to form a texture by approaching the cell sealing edge 2 to the cell main body 1.

And S3 cooling and cold pressing for shaping are carried out within 0.6 second after the edge folding processing in the step S2.

Example 4

A button cell edge folding method comprises the following steps:

s1, heating the battery cell sealing edge 2 to seal and preheat, wherein the sealing and preheating time is 3 seconds;

s2, heating the battery cell sealing edge 2 for edge folding;

s3, cooling, cold pressing and shaping the battery core seal edge 2.

Wherein the edge sealing preheating temperature in the step S1 is 120 ℃.

Wherein the heating temperature in the step S2 is 120 ℃, the pressure of the hemming treatment is 0.4mpa, and the hemming treatment time is 4 seconds.

Wherein the temperature of the cold pressing in the step S3 is 35 ℃, the pressure of the cold pressing is 0.4mpa, and the time of the cold pressing and shaping is 6 seconds.

The sealing edge 2 is made of an aluminum-plastic film.

In step S2, the folding process is to form a texture by approaching the cell sealing edge 2 to the cell main body 1.

And S3 cooling, cold pressing and shaping are carried out within 1 second after the edge folding processing in the step S2.

Example 5

A button cell edge folding method comprises the following steps:

s1, heating the battery cell sealing edge 2 to seal and preheat, wherein the sealing and preheating time is 7 seconds;

s2, heating the battery cell sealing edge 2 for edge folding;

s3, cooling, cold pressing and shaping the battery core seal edge 2.

Wherein the edge sealing preheating temperature in the step S1 is 105 ℃.

Wherein the heating temperature in the step S2 is 105 ℃, the pressure of the hemming treatment is 0.2mpa, and the hemming treatment time is 3 seconds.

Wherein the temperature of the cold pressing in the step S3 is 45 ℃, the pressure of the cold pressing is 0.2mpa, and the time of the cold pressing and shaping is 12 seconds.

The sealing edge 2 is made of an aluminum-plastic film.

In step S2, the folding process is to form a texture by approaching the cell sealing edge 2 to the cell main body 1.

And S3 cooling and cold pressing for shaping are carried out within 0.3 second after the edge folding processing in the step S2.

Comparative example 1

The difference from example 1 is that:

a button cell edge folding method comprises the following steps:

s1, heating the battery cell sealing edge 2 to seal and preheat;

and S2, heating the battery cell sealing edge 2 for flanging.

The rest is the same as embodiment 1, and the description is omitted.

And (3) performance testing: the diameters of the cells prepared by using the crimping method of the present invention and the conventional crimping method (comparative example 1) were measured, and the diameters of the cells after standing for one day and three days, respectively, were measured, and a plurality of experiments were performed, and test data were collected to prepare comparative graphs, as shown in fig. 3 and 4.

As shown in fig. 3, the average value of the diameters of the electric cores prepared by using the edge folding method of the present invention is 11.81, the standard deviation is 0.03, the average value of the diameters of the electric cores after being placed for one day is still 11.81, the diameters of the electric cores are not changed, the standard deviation is 0.02645, the average value of the diameters of the electric cores after being placed for three days is 11.82, and the standard deviation is 0.02773, which indicates that the edge folding method of the button battery of the present invention can effectively solve the rebound phenomenon after edge folding, reduce the fluctuation of the coil diameter of the electric core, thereby avoiding the ultra-wide phenomenon of the electric core, and the prepared electric core has the advantages of small diameter change, good dimensional stability, good quality and high standard reaching rate. As shown in fig. 4, the diameters of the cells prepared by the conventional edge folding method are 11.83, the standard deviation is 0.1015, the average value of the cell diameters after being placed for one day is 11.91, the diameters change by 0.08, the average value of the cell diameters after being placed for three days is 11.97, and the diameters change by 0.14, which indicates that the edge folding has a rebound phenomenon, which causes the diameter change, and the change is large, which affects the size of the cell roll diameter, and causes an ultra-wide phenomenon.

Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the invention as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.