CN105977506B - Square lithium battery and production method thereof - Google Patents

Abstract

The invention discloses a square lithium battery and a production method thereof, wherein two diaphragms are wound and formed into a winding bag, the middle part of the winding bag is provided with a flat part, the left side and the right side form side edge covers, the front ends of an anode sheet material belt and a cathode sheet material belt are respectively cut off through a cutting mechanism to respectively form an anode sheet and a cathode sheet, the anode sheet and the cathode sheet are respectively wound between the two diaphragms, and one anode sheet and one cathode sheet are respectively arranged on the two side surfaces of the diaphragm at the flat part. The process is easy to realize, the technical requirements on the precision of production equipment and the like are lower, the production efficiency is high, the equipment cost of battery production enterprises is reduced, the technical hidden danger of electric leakage and short circuit of the square lithium battery is eliminated, the automatic production is easy to realize, the technical requirements on the production equipment are reduced, and the equipment cost of the battery production enterprises is reduced.

Description

A kind of square lithium battery and production method thereof

technical field

The invention relates to the technical field of lithium batteries and their production techniques, in particular to a square lithium battery and a production method thereof.

Background technique

In the prior art, a square lithium battery includes a diaphragm, an anode sheet and a cathode sheet, the diaphragm, the anode sheet and the cathode sheet are all cut into squares, and then the diaphragm is stacked between the anode sheet and the cathode sheet, and the anode sheet and the cathode sheet are pieces separated. The prismatic battery with this structure has technical hidden dangers of leakage and short circuit; in addition, the prismatic lithium battery has high technical requirements for production equipment, especially the precision requirements and the stability requirements in the production process, and its production process is relatively complicated, and the production efficiency Not high, so it needs to be improved.

Contents of the invention

In view of the deficiencies in the existing technology, the purpose of the present invention is to provide a production process for a square lithium battery, which is easy to implement, has relatively low technical requirements for production equipment such as precision requirements, high production efficiency, and reduces equipment costs for battery manufacturers.

In view of the deficiencies in the prior art, the purpose of the present invention is to provide a square lithium battery, which eliminates the technical hidden dangers of leakage and short circuit, is easy to realize automatic production, reduces the technical requirements for production equipment, and reduces the equipment cost of battery manufacturers.

In order to achieve the above object, the technical solution adopted in the present invention is.

A processing method for a square lithium battery, comprising the following steps,

Two diaphragms are unwound and transported through two diaphragm unwinding mechanisms;

The anode sheet material belt and the cathode sheet material belt are respectively unwound and conveyed by two pole piece unwinding mechanisms;

The two diaphragms, the anode sheet material belt and the cathode sheet material belt are respectively conveyed to the roll-in area in the center of the winding, and the anode sheet material belt and the cathode sheet material belt are separated by two diaphragms;

The anode sheet material belt and the cathode sheet material belt are respectively conveyed to the roll-in area of the winding center by two cutting mechanisms beside the winding center. After the anode sheet material belt and cathode sheet material delivered out reach the set length, the A cutting mechanism cuts off the front ends of the anode sheet material and the cathode sheet material respectively, and forms an anode sheet and a cathode sheet respectively, and the anode sheet and the cathode sheet are respectively wound between the separators on the first side of the winding center ;

The winding center continuously rotates and winds two diaphragms. After the two cutting mechanisms cut off the anode sheet material belt and the cathode sheet material belt respectively, the two cutting mechanisms respectively retreat and reset, and then convey the anode sheet material belt and the cathode sheet material belt again. to the roll-in zone at the center of the coil;

After the winding center rotates to the second side facing the roll-in area, after the conveyed anode sheet material belt and cathode sheet material reach the set length, the two cutting mechanisms respectively cut off the front end of the anode sheet material belt and the cathode sheet material belt. The strip is cut to form an anode piece and a cathode piece respectively, and the anode piece and the cathode piece are respectively wound between the separators on the second side of the winding center;

Repeat the above actions, the two diaphragms are wound in a "back" shape and wrapped one by one to form a roll. There is a flat part in the middle of the roll, and an arc-shaped corner is formed on the left and right sides. The flat part An anode sheet or a cathode sheet is stacked between two adjacent diaphragms, and the anode sheets and cathode sheets in the flat part are stacked alternately;

For the finished product, after the number of winding layers reaches the set number, the winding package is removed from the center of the winding to obtain the finished square lithium battery.

In a further technical solution, the anode sheet material strip is arranged between two diaphragms, and the cathode sheet material strip is arranged at an outer position of one of the diaphragms.

In a further technical solution, the anode sheet material belt and the cathode sheet material belt are respectively passed through a storage mechanism, and after the two cutting mechanisms cut off the anode sheet material belt and the cathode sheet material belt respectively, the two pole piece unwinding mechanisms continue to The unwinding conveys the anode sheet material belt and the cathode sheet material belt, and the corresponding anode sheet material belt and the cathode sheet material belt are respectively stored by corresponding storage mechanisms.

In a further technical solution, two winding centers are set, one winding station and one unloading station are set, and one of the two winding centers moves to the winding station and the other moves to the unloading station in turn. Station, separator, anode sheet and cathode sheet are respectively wound on the winding center at the winding station, and the finished square lithium battery is removed from the winding center at the unloading station.

A square lithium battery, including a plurality of anode sheets cut into sheets, a plurality of cathode sheets cut into sheets, and two continuous rolls of separators, and the two sheets of separators are wound in a "back" shape And one layer is covered to form a package. Two diaphragms are wound synchronously to form the package. The inner ends of the two diaphragms are located at the center of the package, and the outer ends of the two diaphragms are located at the extreme end of the package. The outer layer has a flat part in the middle of the roll, and the left and right sides form side wrapping. The flat part of the roll is provided with a number of anode sheets and cathode sheets, and an anode sheet and a cathode are placed on both sides of the diaphragm at the flat part. piece.

In a further technical solution, from the middle of the roll to the outermost layer of the roll, the width of the roll gradually increases, and the change trend of the width of the anode sheet placed between the diaphragms gradually becomes larger, and the width of the anode sheet placed between the diaphragms gradually increases. The variation trend of the width of the cathode sheet is to gradually become larger.

In a further technical solution, the two sides of each anode sheet and each cathode sheet are covered by the side edges on both sides of the roll, and the side edges on both sides of each roll are An arc wrapping angle is formed respectively.

After adopting the above-mentioned production process, the advantages of the present invention compared with the prior art are: the process of the present invention is easy to implement, has relatively low technical requirements on the precision requirements of production equipment, high production efficiency, and reduces the equipment cost of battery manufacturers. .

Eliminate the technical hidden dangers of leakage and short circuit.

The square lithium battery of the present invention eliminates technical hidden dangers of leakage and short circuit, is easy to realize automatic production, reduces technical requirements for production equipment, and reduces equipment costs of battery production enterprises.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is a structural schematic diagram of the present invention.

In the figure: 1, anode sheet 2, cathode sheet 3, diaphragm 4, flat part 10, anode sheet material belt 11, cathode sheet material belt 12, winding center 13, cutting mechanism 14, storage mechanism.

Detailed ways

The following descriptions are only preferred embodiments of the present invention, and therefore do not limit the protection scope of the present invention.

Embodiment one

A kind of processing method of square lithium battery, shown in Figure 1 and 2, comprises the following steps:

Two diaphragms 3 are respectively unwound and conveyed through two diaphragm unwinding mechanisms;

The anode sheet material belt 10 and the cathode sheet material belt 11 are respectively unwound and transported through two pole piece unwinding mechanisms;

The two diaphragms 3, the anode sheet material band 10 and the cathode sheet material band 11 are transported to the roll-in area of the winding center 12 respectively, and the anode sheet material band 10 and the cathode sheet material band 11 are spaced apart by the two diaphragms 3; The anode sheet material strip 10 is arranged between the two diaphragms 3 , and the cathode sheet material strip 11 is arranged outside one of the diaphragms 3 .

The anode sheet material belt 10 and the cathode sheet material belt 11 are transported to the roll-in area of the winding center 12 by two cutting mechanisms 13 on the side of the winding center 12 respectively, and the anode sheet material belt 10 and the cathode sheet material reaching the After the length is set, two cutting mechanisms 13 cut off the strips at the front ends of the anode strip 10 and the cathode strip 11 respectively, and form an anode strip 1 and a cathode strip 2 respectively, and the anode strip 1 and the cathode strip 2 respectively Involved between the diaphragm 3 on the first side of the winding center 12;

The winding center 12 continuously rotates and winds two diaphragms 3. After the two cutting mechanisms 13 cut off the anode sheet material belt 10 and the cathode sheet material belt 11 respectively, the two cutting mechanisms 13 retreat and reset respectively, and then convey the anode sheet material again. The roll-in area of the strip 10 and the cathode sheet stock strip 11 to the winding center 12;

After the winding center 12 rotates to the second side facing the roll-in area, after the anode sheet material belt 10 and the cathode sheet material delivered out reach the set length, two cutting mechanisms 13 respectively cut the anode sheet material belt 10 and the cathode sheet material The material tape at the front end of the material tape 11 is cut off, and an anode sheet 1 and a cathode sheet 2 are respectively formed, and the anode sheet 1 and the cathode sheet 2 are respectively wound between the diaphragm 3 on the second side of the winding center 12;

The anode sheet material belt 10 and the cathode sheet material belt 11 are respectively passed through a storage mechanism 14, and after the two cutting mechanisms 13 cut off the anode sheet material belt 10 and the cathode sheet material belt 11 respectively, the two pole piece unwinding mechanisms are continuous The anode sheet material belt 10 and the cathode sheet material belt 11 are unwound and transported out, and the corresponding anode sheet material belt 10 and cathode sheet material belt 11 are stored by the corresponding storage mechanism 14 respectively;

By repeating the above actions, the two diaphragms 3 are wound in a "back" shape and covered one by one to form a roll. The middle of the roll has a flat part 4, and the left and right sides form an arc-shaped wrap angle. An anode sheet 1 or a cathode sheet 2 is stacked between two adjacent diaphragms 3 of the flat part 4, and the anode sheet 1 and the cathode sheet 2 in the flat part 4 are alternately stacked;

For the finished product, after the number of winding layers reaches the set number, the winding package is removed from the winding center 12 to obtain the finished square lithium battery.

Two winding centers 12 are set, a winding station and an unloading station are set,

One of the two winding centers 12 is switched alternately to move to the winding station and the other to the unloading station. The diaphragm 3, the anode sheet 1 and the cathode sheet 2 are respectively wound at the winding center at the winding station. 12. Take off the finished square lithium battery from the winding center 12 at the unloading station.

Embodiment two

A square lithium battery, as shown in Figure 2, includes a plurality of anode sheets 1 cut into sheets, a plurality of cathode sheets 2 cut into sheets and a separator 3 continuously rolled, anode sheets 1 and cathode sheets The shape of the diaphragm 2 is square, and the diaphragm 3 is wound in the form of a layer covering a layer to form a roll. The inner end of the diaphragm 3 is located at the center of the roll, and the outer end of the diaphragm 3 is located at the outermost layer of the roll. The side wrapping edges 5 on both sides of the roll package respectively form an arc-shaped convex part. There is a flat part 4 in the middle of the roll, and side wrapping 5 is formed on the left and right sides. The flat part 4 of the roll is provided with a number of anode sheets 1 and cathode sheets 2, and a piece of anode is placed on both sides of the diaphragm 3 at the flat part 4. Sheet 1 and a cathode sheet 2.

Specifically, the square lithium battery includes two separators 3 that are rolled continuously. The inner ends of the two separators 3 are located at the center of the roll, and the two separators 3 are wound synchronously to form the roll. The outer ends of the two separators 3 The end is located on the outermost layer of the roll. There are only two separators 3 in the square lithium battery, and the middle of each separator 3 is uninterrupted. The two separators 3 are wound around the center together, and the two separators 3 of the flat part 4 are separated during the winding process. The anode piece 1 and the cathode piece 2 are put in to form a square lithium battery, which can completely separate each anode piece 1 and each cathode piece 2, and eliminate the technical hidden dangers of leakage and short circuit.

From the middle of the roll to the outermost layer of the roll, the width of the roll gradually increases, the change trend of the width of the anode sheet 1 placed between the diaphragms 3 is gradually larger, and the cathode sheet 2 placed between the separators 3 The variation trend of the width is to gradually become larger. Both sides of the anode sheet 1 and each cathode sheet 2 are covered by side wrapping edges 5 on both sides of the roll.

Other technologies of the prismatic lithium battery are existing technologies, for example, the anode sheet 1 and the cathode sheet 2 are electrically connected with electrodes or tabs, which will not be repeated here.

The above content is only a preferred embodiment of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and application scope. limits.

Claims (7)

1. a kind of processing method of quadrate lithium battery, it is characterised in that：Include the following steps,

It is unreeled respectively by Liang Ge membrane unwindings mechanism and transfers out two diaphragms (3)；

It is unreeled respectively by two pole piece unreeling structures and transfers out anode strip material strip (10) and cathode sheets material strip (11)；

Two diaphragms (3), anode strip material strip (10) and cathode sheets material strip (11) are respectively delivered to being involved in for coiling center (12) Area, and it is spaced apart anode strip material strip (10) and cathode sheets material strip (11) by two diaphragms (3)；

Respectively anode strip material strip (10) and cathode sheets material strip are conveyed by two cutting mechanisms (13) of coiling center (12) side (11) area is involved in coiling center (12), reaches setting length in the anode strip material strip (10) and cathode sheet stock transferred out Afterwards, two cutting mechanisms (13) respectively cut off anode strip material strip (10) and the material strip of cathode sheets material strip (11) front end, and respectively An anode strip (1) and a cathode sheets (2) are formed, anode strip (1) and cathode sheets (2) are rolled into (12) first side of coiling center respectively Between the diaphragm (3) in face；

Continuously rotation coiling two opens diaphragm (3) at coiling center (12), and anode strip is cut off respectively in two cutting mechanism (13) cut-outs After material strip (10) and cathode sheets material strip (11), two cutting mechanisms (13) retreat reset respectively, then convey anode sheet stock again Band (10) and cathode sheets material strip (11) are involved in area to coiling center (12)；

Second side is rotated in coiling center (12) towards after being involved in area, in the anode strip material strip (10) and cathode transferred out After sheet stock reaches setting length, two cutting mechanisms (13) are respectively by anode strip material strip (10) and cathode sheets material strip (11) front end Material strip is cut off, and is respectively formed an anode strip (1) and a cathode sheets (2), anode strip (1) and cathode sheets (2) be rolled into respectively around Between the diaphragm (3) of volume center (12) second side；

Above-mentioned action is recycled, two diaphragms (3) coiling in a manner of " returning " font coiling simultaneously coats one layer and forms a roll of packet for one layer, Rolling up in the middle part of packet has an evener (4), one arc cornerite of left and right sides formation, between the two neighboring diaphragm (3) of evener (4) Stack a piece of anode strip (1) or a cathode sheets (2), the anode strip (1) and cathode sheets (2) in evener (4), which are staggeredly spaced, to be stacked；

Finished product after the coiling number of plies reaches setting quantity, removes volume packet from coiling center (12), obtains finished quad lithium battery.

2. a kind of processing method of quadrate lithium battery according to claim 1, it is characterised in that：

Between anode strip material strip (10) is arranged on two diaphragms (3), cathode sheets material strip (11) is disposed therein a diaphragm (3) Outer fix.

3. a kind of processing method of quadrate lithium battery according to claim 1, it is characterised in that：

Respectively by anode strip material strip (10) and cathode sheets material strip (11) by a material storage mechanism (14), in two cutting mechanisms (13) After cut-out cuts off anode strip material strip (10) and cathode sheets material strip (11) respectively, two pole piece unreeling structures continuously unreel and transfer out sun Pole piece material strip (10) and cathode sheets material strip (11) store corresponding anode strip material strip (10) by corresponding material storage mechanism (14) respectively With cathode sheets material strip (11).

4. a kind of processing method of quadrate lithium battery according to claim 1, it is characterised in that：

Two coiling centers (12) are set, set a coiling station and a unloading station,

In turn switch two coiling centers (12) one of them be moved to coiling station, another be moved to unloading station, every Coiling is at the coiling center (12) in coiling station respectively for film (3), anode strip (1) and cathode sheets (2), from unloading station Coiling center (12) remove finished quad lithium battery.

5. a kind of rectangular lithium that a kind of processing method of quadrate lithium battery according to one of Claims 1-4 is produced Battery, including multiple anode strips (1) for cutting slabbing and multiple cathode sheets (2) for cutting slabbing, it is characterised in that：Also wrap Two continuous coiled diaphragms (3) are included, two diaphragms (3) coiling in a manner of " returning " font coiling simultaneously coats one layer and formed for one layer A roll packet, the synchronous coiling of two diaphragms (3) form the volume packet, and the inner end of two diaphragms (3) is respectively positioned on the central part of volume packet, and two The outer end for opening diaphragm (3) is located at the outermost layer of volume packet, and volume wraps middle part, and there is an evener (4), the left and right sides to form side bound edge (5), the evener (4) of packet is rolled up if being provided with dry plate anode strip (1) and cathode sheets (2), two of the diaphragm (3) at evener (4) A piece of anode strip (1) and a piece of cathode sheets (2) are placed respectively in side.

6. a kind of quadrate lithium battery according to claim 5, it is characterised in that：From the middle part of volume packet to the outermost of volume packet Layer, the width for rolling up packet gradually increases, and the variation tendency for being placed on the width of anode strip (1) between diaphragm (3) is to become larger, The variation tendency for being placed on the width of the cathode sheets (2) between diaphragm (3) is to become larger.

7. a kind of quadrate lithium battery according to claim 5, it is characterised in that：It is per a piece of anode strip (1) and each The two sides of cathode sheets described in piece (2) are coated by the side bound edge (5) of the volume packet both sides, the side per a piece of volume packet both sides Bound edge (5) is respectively formed an arc cornerite.