CN111341947A - Special-shaped high-rate battery and preparation method thereof - Google Patents

Abstract

The invention discloses a special-shaped high-rate battery, comprising a casing and an electric core arranged in the casing. The axial length of the casing is greater than the radial width, and the radial width of the casing gradually increases along the axial direction and then gradually decreases; It includes at least one positive electrode sheet and at least two negative electrode sheets. The positive electrode sheet and the negative electrode sheet are alternately stacked, and a separator sheet is arranged between any positive electrode sheet and the negative electrode sheet. The positive electrode sheet is a metal foil with a conductive layer and a positive electrode coating layer arranged in sequence; the battery core also includes a positive electrode lug fixedly connected with the positive electrode sheet and a negative electrode lug fixedly connected with the negative electrode sheet, and the positive electrode lug and the negative electrode lug are respectively separated from the positive electrode sheet. and the negative electrode sheet extends out of the outer casing; and also includes the electrolyte injected into the outer casing. The battery provided by the present invention is arranged in a special shape as a whole, which can improve the space utilization rate of the electronic product and at the same time achieve the purpose of high magnification, and the manufacturing process is simple and smooth.

Description

Special-shaped high-rate battery and preparation method thereof

technical field

The invention relates to the technical field of lithium ion batteries, in particular to a special-shaped high-rate ion battery and a preparation method thereof.

Background technique

Lithium battery is a kind of battery that uses lithium metal or lithium alloy as negative electrode material and uses non-aqueous electrolyte solution. Lithium batteries can be roughly divided into two categories: lithium metal batteries and lithium ion batteries. Lithium-ion batteries do not contain lithium in the metallic state and are rechargeable. With the development of modern society, polymer lithium-ion batteries are used in various electrical products due to their superior electrical properties and safety, such as smart watches, digital cameras, Bluetooth and so on. The scope of its use is also becoming more and more extensive, so there are strict requirements for the structure of the battery. With the improvement of people's living standards, personalized electronic products emerge in an endless stream, such as wrist phones, wrist watches, wrist pressure meters and so on. Due to the wide application of the above-mentioned personalized electronic products in various aspects, the battery has not only the shape requirements, but also the rate requirements. How to improve the rate of special-shaped lithium-ion batteries in the case of small volume has always been a difficult problem in the industry.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a special-shaped high-rate battery and a preparation method thereof in view of the defects of the prior art.

The technical scheme adopted by the present invention to solve its technical problems is:

A special-shaped high-rate battery includes an outer casing and a battery core arranged in the outer casing, the axial length of the outer casing is greater than the radial width, and the radial width of the outer casing gradually increases from the center of the outer casing to the two sides in the axial direction. reduce;

The battery cell includes at least one positive electrode sheet and at least two negative electrode sheets, the positive electrode sheet and the negative electrode sheet are alternately stacked, and a separator sheet is arranged between any one of the positive electrode sheet and the negative electrode sheet, and the The shapes of the positive electrode sheet, the negative electrode sheet and the separator sheet are the same as the shape of the outer shell;

The positive electrode sheet is an aluminum foil sequentially provided with a conductive layer and a positive electrode coating layer;

The battery cell further includes a positive electrode tab fixedly connected to the positive electrode sheet and a negative electrode tab fixedly connected to the negative electrode sheet, the positive electrode tab and the negative electrode tab extending from the positive electrode sheet and the negative electrode sheet to the outside the housing;

The special-shaped high-rate battery further includes an electrolyte solution injected into the casing.

Preferably, the casing includes a first opening and a second opening arranged radially opposite through the casing, and one of the positive electrode tab and the negative electrode lug extends from the first opening to the casing In addition, the other one of the positive tab and the negative tab extends from the second opening to the outside of the housing.

Preferably, the positive electrode sheet is provided with a first empty foil area fixedly connected with the positive electrode tab, and the negative electrode sheet is provided with a second empty foil area fixedly connected with the negative electrode tab.

Preferably, the outer circumference of the positive electrode sheet and the negative electrode sheet is smaller than the outer circumference of the separator sheet.

Preferably, a plurality of the separator sheets are independent of each other, and the separator sheets are arranged between any one of the positive electrode sheets and the negative electrode sheets;

Alternatively, a plurality of the separator sheets are connected as a whole in a zigzag arrangement, and the positive electrode sheet and the negative electrode sheet are interleaved between any two adjacent separator sheets.

Preferably, the outer shell includes two shell walls, including at least one first shell wall with the same shape as the battery core, and at least one of the first shell walls is provided with a groove for accommodating the battery core, The shape of the groove is the same as the shape of the battery core; the two shell walls are connected to form the shell.

A preparation method of a special-shaped high-rate battery, comprising the following steps:

S1. Obtain the positive electrode sheet and the negative electrode sheet respectively by batching, coating, rolling and punching;

S2, obtain a diaphragm sheet with the same shape as the positive electrode sheet and/or the negative electrode sheet by punching;

S3, the positive electrode sheet, the negative electrode sheet and the diaphragm sheet are alternately stacked and arranged to form a battery cell;

S4, punch out a shell with the same shape as the battery core on the aluminum-plastic film;

S5, putting the battery cell into the casing and sealing the periphery of the casing for the first time, and leaving one side of the casing open to form an opening;

S6, baking at high temperature, injecting liquid into the casing through the opening to complete the second sealing, sealing the opening, and aging to obtain a semi-finished product of a special-shaped lithium battery;

S7, pre-charging and degassing the semi-finished product of the special-shaped lithium battery, and performing two seals along the outer periphery of the outer casing;

S8, cutting the aluminum-plastic film around the casing along the sealing line formed by the two seals to obtain a special-shaped lithium battery.

Preferably, step S3 further includes welding the positive electrode tabs on the positive electrode sheet, and welding the negative electrode tabs on the negative electrode tabs; attaching high temperature glue at the connection between the positive electrode tab and the positive electrode tab, and the connection between the negative electrode tab and the negative electrode tab;

In step S5, the positive electrode tabs and the negative electrode tabs extend out of the casing from the first opening and the second opening respectively, and the tab glue on the positive electrode tabs and the negative electrode tabs is located at the sealing part of the package.

Preferably, in step S4, two first shell walls are punched out on the two aluminum-plastic films, wherein the first shell walls have grooves with the same shape as the battery core; in step S5, the battery The core is put into a groove of the first shell wall, and the two shell walls are relatively matched to form a shell, and the battery core is wrapped in it;

Alternatively, in step S4, two symmetrically arranged first shell walls are punched out from an aluminum-plastic film, and in step S5, the two first shell walls are folded in half along the symmetry line, and the battery cells are placed in the Between the two first shell walls, the two first shell walls are relatively matched to form the shell, and the battery core is encapsulated therein.

Preferably, in step S4, a first shell wall with the same shape as the battery core is punched out on the aluminum plastic film, and the first shell wall has a groove for accommodating the battery core; the first shell The wall is located on one end of the aluminum-plastic film; in step S5, the battery core is put into the groove of the first shell wall, and the aluminum-plastic film is folded in half, so that the other side of the aluminum-plastic film is folded. One end is covered on the first shell wall to close the groove, and the battery core is covered therein;

Alternatively, in step S4, a first shell wall with the same shape as the battery core is punched out on the aluminum plastic film, and has a groove for accommodating the battery core; in step S5, another aluminum plastic film is used to laminate The groove is closed on the shell wall, and the battery core is encapsulated therein.

The invention has the following beneficial effects: the special-shaped high-rate battery of the present invention is set in a special-shaped configuration as a whole, provides a battery with good performance and a unique appearance for customized electronic products, and realizes high rate while improving the space utilization rate of electronic products. purpose, and the production process is simple and smooth.

Description of drawings

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

1 is a schematic diagram of a battery structure according to an embodiment of the present invention;

Fig. 2 is the shell structure schematic diagram of an embodiment of the present invention;

3 is a schematic diagram of a cell structure according to an embodiment of the present invention;

4 is a schematic structural diagram of a positive electrode sheet according to an embodiment of the present invention;

5 is a schematic structural diagram of a negative electrode sheet according to an embodiment of the present invention;

6 is a schematic structural diagram of a diaphragm sheet in an embodiment of the present invention;

7 is a schematic structural diagram of a diaphragm in another embodiment of the present invention;

8 is a schematic structural diagram of a shell wall in an embodiment of the present invention;

Fig. 9 is the structural schematic diagram of the shell wall in another embodiment of the present invention;

10 is a schematic diagram of a package for the first sealing in an embodiment of the present invention;

11 is a schematic diagram of a package of the second sealing in an embodiment of the present invention;

FIG. 12 is a schematic diagram of a package of two seals in an embodiment of the present invention.

Detailed ways

In order to have a clearer understanding of the technical features, objects and effects of the present invention, the specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

As shown in FIG. 1 , the special-shaped high-rate battery provided by the present invention can be used in a wrist-type electronic device and other special-shaped electronic devices that require high-rate power supply. , wherein the outer casing 1 and the battery core 2 are both olive-like, that is, the axial length is greater than the radial width, and the radial width of the outer casing 1 is gradually reduced from the center of the outer casing 1 to both sides in the axial direction, as a preferred embodiment of the present invention. In the embodiment, the radial width decreases smoothly from the center of the housing 1 to both sides in the axial direction.

As shown in FIG. 2 , the casing 1 is an inner hollow casing made of aluminum-plastic film, including a first opening 11 and a second opening 12 penetrating the inner cavity of the casing 1 . In some embodiments, the first opening 11 and The second openings 12 are arranged opposite to each other in the radial direction, and the first opening 11 and the second opening 12 are preferably arranged at the farthest radial ends. In some embodiments, referring to FIGS. 8 to 9 , the casing 1 includes two casing walls 13 , including at least one first casing wall 13 a having the same shape as the battery cell 2 , and the first casing wall 13 a is provided with a space for accommodating The groove of the battery core 2, the shape of the groove is the same as the shape of the battery core 2, and the two shell walls 13 are connected with each other to form the shell 1; as another embodiment of the present invention, the shell 1 includes two shell walls 13, including At least one first shell wall 13a with the same shape as the cell 2, the first shell wall 13a is provided with a groove for accommodating the cell 2, the groove shape is the same as the shape of the cell 2, the two shell walls 13 One side is connected, and the two shell walls 13 are folded and matched in half with the connecting point as the axis of symmetry to form the shell 1 .

Referring to FIG. 3 , the battery cell 2 includes at least one positive electrode sheet 21 and at least two negative electrode sheets 22 , the positive electrode sheet 21 and the negative electrode sheet 22 are alternately stacked, and a separator sheet 23 is provided between any positive electrode sheet 21 and the negative electrode sheet 22 , wherein, referring to FIGS. 6 and 7, a plurality of diaphragm sheets 23 can be independent of each other, that is, each diaphragm sheet 23 can be set between any positive electrode sheet 21 and negative electrode sheet 22; or, a plurality of diaphragm sheets 23 are connected as As a whole, when viewed as a tile, several diaphragms 23 are connected radially. When a plurality of radially connected diaphragms 23 form the cell 2, they are arranged in a zigzag shape, that is, a plurality of radially connected diaphragms 23 are in space. The inner longitudinally overlapping arrangement, the positive electrode sheet 21 and the negative electrode sheet 22 are interleaved between any two adjacent diaphragm sheets 23 . The battery cell 2 with a certain thickness is formed by stacking the positive electrode sheet 21 , the negative electrode sheet 22 and the separator sheet 23 . In the embodiment, the pole pieces of the uppermost layer and the lowermost layer of the battery core 2 are both negative electrode pieces 22, and the outer sides of the two negative electrode pieces 22 are provided with diaphragm pieces 23, and the upper and lower sides of the battery core 2 are both separated by the diaphragm pieces 23. The negative tabs 22 are isolated. Wherein, in order to avoid short-circuiting of the positive electrode sheet 21 and the negative electrode sheet 22 , the outer peripheral dimensions of the positive electrode sheet 21 and the negative electrode sheet 22 are both smaller than the outer peripheral size of the separator sheet 23 .

In some embodiments, referring to FIG. 3 , the battery cell 2 further includes a positive electrode tab 24 fixedly connected with the positive electrode sheet 21 and a negative electrode tab 25 fixedly connected with the negative electrode sheet 22 . The negative tab 22 extends from the first opening 11 and the second opening 12 to the outside of the casing 1. Of course, it can be understood that the positive tab 24 and the negative tab 25 can also extend from the second opening 12 and the first opening 11 to the casing 1 respectively. In addition, that is, the positive electrode tab 24 and the negative electrode tab 25 do not have a one-to-one correspondence with the first opening 11 and the second opening 12, and they can be combined at will.

Usually, the positive electrode sheet 21 is a metal foil with a positive electrode coating layer on both sides, preferably an aluminum foil. In the present invention, in order to improve the battery rate of the special-shaped battery, a conductive layer is provided on the aluminum foil, and the positive electrode sheet 21 is sequentially An aluminum foil with a conductive layer and a positive electrode coating layer is provided, that is, a carbon-coated layer is first placed on the aluminum foil as a conductive layer, and then a layer of positive electrode mixed with a positive electrode active material, a conductive agent, and a binder is placed on the conductive layer. The coating layer, the front and back sides of the aluminum foil are provided with a conductive layer and a positive electrode coating layer in turn; the negative electrode sheet 22 is a metal foil provided with a negative electrode coating layer, preferably a copper foil, that is, a negative electrode active material is provided on both sides of the copper foil. The negative electrode coating layer formed by mixing the conductive agent and the binder is used as the negative electrode sheet 22 . 4 and 5, in order to connect the positive electrode tab 24 and the negative electrode tab 25, one end of the positive electrode sheet 21 is also provided with a first empty foil area 211, and the first empty foil area 211 is integrally connected with the positive electrode sheet 21, which can be a self-positive electrode sheet. The aluminum foil extending from 21 without a positive electrode coating layer and a conductive layer; one end of the negative electrode sheet 22 is provided with a second empty foil area 221, and the second empty foil area 221 is integrally connected with the negative electrode sheet 22, which can be extended from the negative electrode sheet 22. For the copper foil without the negative electrode coating layer, the positive electrode tab 24 is connected to the first empty foil area 211 , and the negative electrode tab 25 is connected to the second empty foil area 221 . In some embodiments, in order to improve the space utilization rate of the special-shaped battery, the shapes of the positive electrode sheet 21, the negative electrode sheet 22 and the separator sheet 23 are all the same as the shape of the casing 1, that is, the area of the positive electrode coating layer and the negative electrode coating layer is maximized, In order to improve the rate of the special-shaped battery.

In order to prevent the short circuit of the battery cell 2, after the positive electrode lug 24 and the negative electrode lug 25 are welded, high temperature resistant high temperature glue is attached to the connection between the positive electrode lug 24 and the positive electrode sheet 21, and the junction of the negative electrode lug 25 and the negative electrode sheet 22 respectively.

After the battery cell 2 is assembled in the casing 1, the first empty foil area 211, the second empty foil area 221 and the high-temperature glue are all located inside the casing 10, and the end of the positive electrode tab 24 away from the first empty foil area 211 and the negative electrode tab 25 away from One end of the second empty foil area 221 extends out of the casing 1 .

The special-shaped high-rate battery also includes an electrolyte injected into the casing 1, and the positive electrode sheet 21 and the negative electrode sheet 22 are completely immersed in the electrolyte to realize the exchange of lithium ions.

The invention also provides a preparation method of a special-shaped high-rate battery, which comprises the following steps:

S1, the positive electrode sheet 21 and the negative electrode sheet 22 are respectively obtained by batching, coating, rolling, and punching.

Wherein, a conductive layer and a positive electrode coating layer are sequentially coated on the aluminum foil, wherein the conductive layer is a carbon-coated layer in some embodiments, and the positive electrode coating layer is composed of a positive electrode active material, a conductive agent and an adhesive in some embodiments. The positive electrode slurry is prepared by mixing the positive electrode slurry, and the coated aluminum foil is dried, rolled and punched to complete the production of the positive electrode sheet 21; a negative electrode coating layer is coated on the copper foil, and the negative electrode coating layer is in some embodiments. In the middle is the negative electrode slurry which is mixed with the negative electrode active material, the conductive agent and the binder. The coated copper foil is dried, rolled and punched to complete the production of the negative electrode sheet 22 . The positive electrode sheet 21 and the negative electrode sheet 22 are both reserved with a light foil part without a coating layer and a conductive layer, as the first empty foil area 211 and the second empty foil area 221 for welding the positive electrode lug 24 and the negative electrode lug 25.

S2. A separator sheet 23 having the same shape as the positive electrode sheet 21 and/or the negative electrode sheet 22 is obtained by punching.

Among them, the punching is done by a punching machine. As shown in FIG. 6, it can be punched into individual diaphragms 23. As shown in FIG. 7, a diaphragm material can also be punched into several radially connected diaphragms. twenty three.

S3 , the positive electrode sheet 21 , the negative electrode sheet 22 and the separator sheet 23 are alternately stacked and arranged to form the battery cell 2 .

Wherein, in some embodiments, after the above-mentioned positive electrode sheet 21, negative electrode sheet 22 and separator sheet 23 are alternately stacked, the first empty foil area 211 on the positive electrode sheet 21 is aligned and the first empty foil area 211 is arranged on the first empty foil area 211. At the opening 11, align the second empty foil area 221 on the negative electrode sheet 22 and set the second empty foil area 221 at the second opening 12; this step S3 also includes welding the positive electrode tab 24 to the first empty foil area. 211 , the negative electrode tab 25 is welded on the second empty foil area 221 , and the positive electrode tab 24 and the negative electrode tab 25 extend from the first opening 11 and the second opening 12 to the outside of the casing 1 respectively. In order to prevent the short circuit of the battery cell 2, high temperature glue is also attached to the connection between the positive electrode lug 24 and the positive electrode sheet 21, and the junction between the negative electrode lug 25 and the negative electrode sheet 22;

S4 , punching out a casing 1 having the same shape as the cell 2 on the aluminum-plastic film 3 , and the punched casing 1 does not detach from the aluminum-plastic film 3 .

In addition, referring to FIGS. 8 and 9 , an airbag 31 can also be punched out on the aluminum-plastic film 3 and at the spacer housing 1 for subsequent gas and liquid storage.

S5, put the battery cell 2 into the casing 1 and seal the periphery of the casing 1 for the first time, and leave one side of the casing 1 open to form the opening 42;

In this step S5 , referring to FIG. 10 , the periphery of the casing 1 is sealed for the first time to form the first sealing wire 41 .

Referring to FIG. 10, in step S4 and step S5, as the first embodiment of the present invention, two symmetrical first shell walls 13a are respectively punched out from two aluminum-plastic films 3 according to the shape of the battery core 2. The The first shell wall 13a has a groove with the same shape as the cell 2 for accommodating the cell 2. The cell 2 is placed in one of the grooves, and the other first shell wall 13a is covered on the cell 2. The two first shell walls 13a are arranged opposite to form the shell 1. At this time, the shell has four open sides. The two sides of the shell 1 that are provided with the positive and negative lugs and the remaining any side are sealed to form the first seal. Only one open side of the bonding wire 41 is left to form an opening 42 for subsequent injection of electrolyte.

As a second embodiment of the present invention, a first shell wall 13a having a groove for accommodating the battery cell 2 is punched out on a piece of aluminum-plastic film 3 according to the shape of the battery cell 2, and the depth of the groove is greater than the thickness of the battery core 2, After placing the battery core 2 into the groove, another aluminum-plastic film 3 is taken to cover the upper surface of the battery core 2 directly, and the packaging steps are the same as those in the first embodiment, and are not repeated here.

As the third embodiment of the present invention, on the basis of the first embodiment, two symmetrical first shell walls 13a are punched on the same aluminum-plastic film 3, and after the battery core 2 is placed in the groove, the two first shells The wall 13a is folded in half along its symmetry line, so that the two first shell walls 13a are relatively matched to form the shell 1. At this time, the shell 1 has three open sides, and the shell 1 is provided with two open sides of the positive electrode lug 24 and the negative electrode lug 25. The first sealing line 41 is formed by sealing, and the remaining side is not sealed, so as to form an opening 42 for subsequent injection of electrolyte.

As the fourth embodiment of the present invention, on the basis of the second embodiment, a first shell wall 13a is punched out at one end of the aluminum-plastic film, and the groove depth of the first shell wall 13a is greater than that of the battery cell 2 . After placing the battery core 2 in the groove, fold the remaining aluminum-plastic film 3 and the first shell wall 13a in half, and the remaining aluminum-plastic film 3 covers the top of the battery core 2. At this time, the outer shell 1 has three open sides. The two open sides of the casing provided with the positive electrode tab 24 and the negative electrode tab 25 are sealed to form a first sealing line 41 , and the remaining side is not sealed to form an opening for subsequent injection of electrolyte.

S6, baking at high temperature, injecting liquid into the casing through the opening to complete the second sealing, sealing the opening, and aging to obtain a semi-finished product of a special-shaped high-rate battery.

The electrolyte solution is injected into the casing 1 through the opening 42, so that the positive electrode sheet 21, the negative electrode sheet 22 and the separator sheet 23 are completely immersed in the electrolyte solution. The opening 42 is then sealed to form a second sealing line 43. Referring to FIG. 11, the first sealing line 41 and the second sealing line 43 completely close the casing 1 to the outside. The shape is mainly the outer peripheral shape of the aluminum-plastic film 3 .

S7. Pre-charge and degas the semi-finished product of the special-shaped high-rate battery, and carry out two seals along the outer circumference of the shell 1;

The third sealing line 44 formed after the second sealing is located on the outer periphery of the casing 1, wherein, when the airbag 31 punched in step S4 is being sealed for the second time, some gas and electrolyte inside the casing 1 can be squeezed to the In the airbag 31, the cracking phenomenon of the casing 1 due to extrusion is avoided.

S8. Cut off the aluminum-plastic film 3 around the casing 1 along the third sealing line 44 formed by the two seals to obtain a special-shaped high-rate lithium battery.

The special-shaped high-rate lithium battery provided by the invention can reach more than 95% of the 1C discharge capacity at 40C-70C, significantly improve the space utilization rate of the battery, and improve the battery rate while meeting the shape requirements, so as to improve the battery's performance. work efficiency.

The above examples only represent several embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can also be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims (10)

1. A special-shaped high-rate battery, characterized in that it comprises an outer casing (1) and a battery cell (2) arranged in the outer casing (1), wherein the axial length of the outer casing (1) is greater than the radial width, The radial width of the casing (1) gradually decreases from the center of the casing (1) to both sides in the axial direction; The battery cell (2) includes at least one positive electrode sheet (21) and at least two negative electrode sheets (22), the positive electrode sheet (21) and the negative electrode sheet (22) are alternately stacked and arranged, and any one of the positive electrode sheets A separator sheet (23) is arranged between the sheet (21) and the negative electrode sheet (22), and the positive electrode sheet (21), the negative electrode sheet (22) and the separator sheet (23) are all shaped with the same The shell (1) has the same shape; The positive electrode sheet (21) is a metal foil sequentially provided with a conductive layer and a positive electrode coating layer; The battery cell (2) further comprises a positive electrode tab (24) fixedly connected to the positive electrode sheet (21) and a negative electrode tab (25) fixedly connected to the negative electrode sheet (22), the positive electrode tab (24) and the negative electrode tabs (25) respectively extend from the positive electrode sheet (21) and the negative electrode sheet (22) to the outside of the outer casing (1); The special-shaped high-rate battery further includes an electrolyte filled in the casing (1). 2 . The special-shaped high-rate battery according to claim 1 , wherein the casing ( 1 ) comprises a first opening ( 11 ) and a second opening ( 12), one of the positive electrode lug (24) and the negative electrode lug (25) extends from the first opening (11) to the outside of the casing (1), the positive electrode lug (24) and the The other of the two negative tabs (25) extends from the second opening (12) to the outside of the casing (1). 3 . The special-shaped high-rate battery according to claim 2 , wherein the positive electrode sheet ( 21 ) is provided with a first empty foil region ( 211 ) that is fixedly connected to the positive electrode lug ( 24 ). 3 . The negative electrode sheet (22) is provided with a second empty foil area (221) that is fixedly connected to the negative electrode tab (25). 4 . The special-shaped high-rate battery according to claim 1 , wherein the outer circumference of the positive electrode sheet ( 21 ) and the negative electrode sheet ( 22 ) is smaller than that of the separator sheet ( 23 ). 5 . 5 . The special-shaped high-rate battery according to claim 1 , wherein a plurality of the separator sheets ( 23 ) are independent of each other, and the separator sheets ( 23 ) are arranged on any one of the positive electrode sheets ( 21 ) and all the separator sheets ( 23 ). 6 . between the negative electrode sheets (22); Alternatively, a plurality of the diaphragm sheets (23) are connected as a whole and are arranged in a zigzag shape, and the positive electrode sheet (21) and the negative electrode sheet (22) are alternately inserted into any two adjacent diaphragm sheets (22). 23) between. 6 . The special-shaped high-rate battery according to claim 1 , wherein the casing ( 1 ) comprises two casing walls ( 13 ), including at least one first battery cell ( 2 ) having the same shape as the first one. 7 . Shell walls (13a), at least one of the first shell walls (13a) is provided with a groove for accommodating the battery core (2), the groove shape is the same as the shape of the battery core (2); two Each of the shell walls (13) is connected with each other to form the shell (1). 7. The preparation method of the special-shaped high-rate battery according to any one of claims 1-6, characterized in that, comprising the following steps: S1, respectively obtaining a positive electrode sheet (21) and a negative electrode sheet (22) by batching, coating, rolling, and punching; S2, obtaining a diaphragm sheet (23) having the same shape as the positive electrode sheet (21) and/or the negative electrode sheet (22) by punching; S3. The positive electrode sheet (21), the negative electrode sheet (22) and the separator sheet (23) are alternately stacked and arranged to form a battery cell (2); S4, punching out a casing (1) having the same shape as the battery core (2) on the aluminum-plastic film (3); S5. Put the battery cell (2) into the casing (1) and seal the periphery of the casing (1) for the first time, and leave one side of the casing (1) open to form an opening (42); S6, baking at high temperature, injecting electrolyte into the casing (1) through the opening (42) to complete the second sealing, sealing the opening (42), and aging to obtain a special-shaped high-rate battery semi-finished products; S7, pre-charging and degassing the semi-finished product of the special-shaped high-rate battery, and carrying out two seals along the outer periphery of the casing (1); S8, cutting the aluminum-plastic film (3) around the casing (1) along the sealing line formed by the two seals to obtain a special-shaped high-rate battery. 8. The preparation method of the special-shaped high-rate battery according to claim 7, wherein step S3 further comprises welding the positive electrode lug (24) on the positive electrode sheet (21), and welding the negative electrode lug (24) on the negative electrode sheet (22). 25); Affix high temperature glue at the junction of the positive electrode lug (24) and the positive electrode sheet (21), and the junction of the negative electrode lug (25) and the negative electrode sheet (22); In step S5, the positive electrode tab (24) and the negative electrode tab (25) protrude from the casing (1) from the first opening (11) and the second opening (12), respectively, and the positive electrode tab (24) ) and the high temperature glue on the negative electrode tab (25) at the sealing part of the package. 9 . The method for preparing a special-shaped high-rate battery according to claim 7 , wherein in step S4 , two first shell walls ( 13 a ) are respectively punched out on the two aluminum-plastic films ( 3 ), wherein the The first shell wall (13a) has a groove with the same shape as the battery core (2); in step S5, the battery core (2) is put into a groove of the first shell wall (13a) Inside, two of the shell walls (13) are matched with each other to form a shell, and the battery core (2) is wrapped in it; Alternatively, in step S4, two symmetrically arranged first shell walls (13a) are punched out on an aluminum-plastic film (3), and in step S5, the two first shell walls (13a) are aligned along the line of symmetry Fold the battery in half, put the battery cell (2) between the two first shell walls (13a), and the two first shell walls (13a) cooperate with each other to form the outer shell (1). The battery core (2) is encapsulated therein. 10 . The method for preparing a special-shaped high-rate battery according to claim 7 , wherein in step S4 , a first shell having the same shape as the battery core ( 2 ) is punched out on the aluminum plastic film ( 3 ). 11 . a wall (13a), the first shell wall (13a) has a groove for accommodating the cell (2); the first shell wall (13a) is located on one end of the aluminum-plastic film (3); In step S5, the battery cell (2) is put into the groove of the first shell wall (13a), and the aluminum-plastic film (3) is folded in half, so that the The other end is covered on the first shell wall (13a) to close the groove, and the battery core (2) is covered therein; Alternatively, in step S4, a first shell wall (13a) having the same shape as the battery core (2) is punched out on the aluminum plastic film (3), and has a groove for accommodating the battery core (2); In step S5, another aluminum-plastic film (3) is used to cover the casing wall (13) to close the groove, and the battery core (2) is covered therein.

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