CN110890579A - Formation method of arc-shaped battery cell and equipment used by same - Google Patents

Formation method of arc-shaped battery cell and equipment used by same Download PDF

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Publication number
CN110890579A
CN110890579A CN201911038946.6A CN201911038946A CN110890579A CN 110890579 A CN110890579 A CN 110890579A CN 201911038946 A CN201911038946 A CN 201911038946A CN 110890579 A CN110890579 A CN 110890579A
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Prior art keywords
arc
battery cell
shaped
forming
clamp
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Inventor
冯宇
韩冰
郑开元
纪荣进
郑明清
陈杰
杨山
李载波
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Huizhou Li Wei Amperex Technology Ltd
Huizhou Liwinon Energy Technology Co Ltd
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Huizhou Li Wei Amperex Technology Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0404—Machines for assembling batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H01M10/446—Initial charging measures
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

The invention provides a formation method of an arc-shaped battery cell and equipment used by the same, wherein the formation method comprises the following steps: s1, placing the battery cell in an arc-shaped clamp, and carrying out extrusion molding on the battery cell through the arc-shaped clamp so as to finish primary preparation of the arc-shaped battery cell; and S2, after the preliminary preparation of the arc-shaped battery cell is completed, continuously maintaining the extrusion state to form the arc-shaped battery cell, and completing the integrated preparation of arc-shaped forming and forming of the battery cell. Compared with the prior art, the arc-shaped fixture is firstly utilized to prepare a preliminary arc-shaped shape, then the battery cell is formed in a state of maintaining the arc-shaped shape, and the arc-shaped shape and the formation are integrated, so that the circulation of the battery cell is reduced, the punch forming process is omitted, and the automation degree of production is improved; due to the maintenance of the subsequent arc shape, the battery cell prepared by the method is not easy to rebound; in addition, the improved preparation process of the invention requires small extrusion pressure, is more favorable for protecting the stability of the interior of the battery cell and is not easy to wear.

Description

Formation method of arc-shaped battery cell and equipment used by same
Technical Field
The invention relates to the field of lithium batteries, in particular to a method for forming an arc-shaped battery cell and equipment for the method.
Background
With the development of science and technology, wearable equipment is more and more widely used, and the quality, performance, size, material and the like of components determine the function and user experience of products. The battery is most directly related to the user, if the battery has poor cruising ability and needs to be charged frequently, the battery is easy to cause the user to feel dislike, and the battery is mainly supplied by an arc-shaped battery on the wearable device at present.
The conventional arc-shaped battery preparation method is approximately the same as the conventional battery preparation method, and the arc-shaped battery preparation method is only to transfer the battery core to a special punch forming device for arc punching after battery core formation and secondary sealing processes to obtain the arc-shaped battery core, and then perform subsequent processes such as capacity grading and the like on the punch formed arc-shaped battery core to complete the arc-shaped battery preparation. The traditional preparation method of the arc-shaped battery separates formation from arc formation, and the arc formation is generally formed by punching under a larger pressure because a battery core is relatively hard, but the preparation method has the following problems: (1) the battery cell is punched after formation, and the battery cell is easy to wear and deform due to excessive external pressure because an SEI film is formed in the battery cell; (2) the hardness of the formed battery core is increased, the battery core is basically a primary battery, then the battery core is punched to be arc-shaped, the required punching pressure is high, the punching time is short in actual production, and the rebound condition exists; however, if the stamping time is only prolonged, the internal abrasion of the battery is easy to be serious; (3) the preparation method has the disadvantages of complicated process, low automation degree and low production efficiency.
In view of the above, it is necessary to provide a technical solution to the above problems.
Disclosure of Invention
One object of the present invention is: by providing the forming method of the arc-shaped battery cell, the problems that the arc-shaped battery cell is easy to wear and deform and rebound in the prior art are solved, the forming and the arc-shaped battery cell forming are synchronously completed, the battery cell wear and deformation is reduced, the battery cell is not easy to rebound, the process flow of the arc-shaped battery cell is simplified, and the production efficiency is greatly improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a formation method of an arc-shaped battery cell comprises the following steps:
s1, placing the battery cell in an arc-shaped clamp, and carrying out extrusion molding on the battery cell through the arc-shaped clamp so as to finish primary preparation of the arc-shaped battery cell;
and S2, after the preliminary preparation of the arc-shaped battery cell is completed, continuously maintaining the extrusion state to form the arc-shaped battery cell, and completing the integrated preparation of arc-shaped forming and forming of the battery cell.
According to the invention, by improving the formation preparation process of the traditional arc-shaped battery cell, the battery cell is placed in the arc-shaped clamp, and preliminary arc-shaped preparation is carried out on the battery cell in advance by using the arc-shaped clamp. After the preliminary extrusion of accomplishing electric core, keep the arc anchor clamps to continue the extrusion and be equivalent to the extrusion time who has prolonged arc electric core, utilize simultaneously to become the machine and become arc electric core, treat to become the back, the arc preparation of electric core is accomplished simultaneously, obtains the arc of electric core and becomes integrative preparation. Compared with the traditional preparation process, the arc-shaped and integrated preparation reduces the circulation of the battery cell, equivalently reduces the punch forming process, and improves the automation degree; meanwhile, the electric core obtained by the preparation method is not easy to wear due to small extrusion pressure, the extrusion time is prolonged, and the prepared electric core is not easy to rebound. The arc-shaped clamp is equivalent to a clamp in a formation machine, and can be completed only by simple assembly, and the description is omitted.
Preferably, the pressure is 200 to 2000kgf/cm2. Under this less pressure, through slowly extruding electric core, ensured the inside stability of electric core, the difficult condition that the wearing and tearing appear in making electric core inside. In addition, in the formation process, the electric core is extruded under the same small pressure, the arc shape of the electric core is further stabilized, and meanwhile, a certain supporting force is given to the electric core due to the existence of the concave surface, so that the arc shape of the electric core is more stabilized and is not easy to rebound. The specific extrusion pressure can be adjusted according to the size of the specific battery cell.
Preferably, in step S1, the extrusion speed of the arc-shaped clamp to the battery cell is 0.1-10 cm/S. The extrusion speed of the battery cell can be adjusted according to the extrusion pressure, but the extrusion speed is ensured to be slowly carried out, so that the extrusion sense brought by the pressure can be adapted in the arc forming process of the battery cell, and the damage to the internal structure of the battery cell caused by the sudden external force is avoided.
Preferably, in step S1, the time for extruding the battery cell is 1 to 1440S. The specific extrusion time can be further adjusted according to different cell models and different radian requirements. When the radian requirement of the electronic part required to be matched with the battery is deeper, the time for extruding the battery core can be prolonged, otherwise, the time for extruding the battery core is shortened. More preferably, in step S1, the time for extruding the battery cell is 80 to 800S.
Preferably, in step S1, the surface temperature of the arc-shaped fixture in contact with the battery cell is 30-90 ℃. In the arc-shaped process, the surface temperature of the arc-shaped clamp and the contact of the battery cell is increased, so that the softening of the battery cell is facilitated to accelerate the arc-shaped forming, and the battery cell can be bent to obtain a preliminary arc-shaped battery cell under smaller pressure.
Preferably, in step S2, the surface temperature of the arc-shaped fixture in contact with the battery cell is 70 to 90 ℃. When the formation process is carried out, the surface temperature of the arc-shaped clamp in contact with the battery core is increased to 70-90 ℃, the completion of battery core charging can be accelerated, the SEI film can be accelerated to be formed, meanwhile, according to the principle of thermal expansion and cold contraction, the pole piece and the diaphragm can be tightly connected through the internal expansion of the battery core under the higher temperature condition, and the energy density of the battery is improved. More preferably, in step S2, the temperature of the surface of the arc-shaped fixture in contact with the battery cell is 75-85 ℃.
Another object of the present invention is to provide an apparatus for a formation method of an arc-shaped battery cell, including an arc-shaped fixture, where the arc-shaped fixture includes a first clamping plate and a second clamping plate disposed opposite to the first clamping plate, the first clamping plate is provided with a first convex surface, and the second clamping plate is provided with a first concave surface matched with the first convex surface. The arc shape of the battery core can be obtained by pushing and pressing the battery core through the convex surface, and the arc shape of the battery core can be stabilized by arranging the concave surface, so that the arc shape is prevented from deforming; in addition, in the formation process, the existence of the concave surface can continuously maintain the arc shape of the battery cell, and the rebound situation is prevented. The specific arrangement shape of the convex surface and the concave surface can be changed correspondingly according to different types of the battery cell.
Preferably, the length of the opening of the first concave surface is greater than or equal to the length of the battery cell. When the opening of the concave surface is large enough or is just matched with the arc needed by the battery cell, the battery cell can be ensured not to be easily damaged by the corner of the concave surface. If the opening undersize of concave surface can't hold electric core, then very easily lead to electric core edge to take place to buckle, become the electric core that the arc appears breaking, and receive the charge-discharge cycle process of the influence electric core of fracture department to be obstructed, lead to energy density to reduce.
Preferably, the temperature of the surface of the first convex surface and the surface of the first concave surface when the first convex surface and the first concave surface are in contact with the battery core is 30-90 ℃. In preliminary arc forming process, the curved shaping can be accelerated to the appropriate surface temperature of convex surface and concave surface, and less pressure can make the crooked preliminary arc electricity core that obtains of electric core.
Preferably, the arc anchor clamps are still including setting up first splint with the third splint that a plurality of intervals between the second splint set up, one side of third splint is provided with the second convex surface, the opposite side of third splint is provided with the second concave surface, adjacent two in the third splint, one the second convex surface and another of third splint the second concave surface phase-match of third splint and relative setting. The arrangement of the third clamping plates enables the plurality of battery cores to synchronously perform arc-shaped and formation procedures, so that the production efficiency is greatly improved. And as long as guarantee between two adjacent third bodies second convex surface and second concave surface phase-match can, be the second convex surface and the second concave surface of a third body can not phase-match promptly, can adjust according to the required radian of different electric cores. The arc-shaped clamp can be used for simultaneously preparing different types of battery cores.
Preferably, the length of the opening of the second concave surface is greater than or equal to the length of the battery cell.
Preferably, the temperature of the surface of the second convex surface and the surface of the second concave surface when the second convex surface and the second concave surface are in contact with the battery core is 30-90 ℃.
Preferably, the temperature of the surface of the first convex surface, the second convex surface, the first concave surface and the second concave surface when the first convex surface, the second convex surface, the first concave surface and the second concave surface are in contact with the battery core is 70-90 ℃. More preferably, the temperature of the surface of the first convex surface, the second convex surface, the first concave surface and the second concave surface when the first convex surface, the second convex surface, the first concave surface and the second concave surface are in contact with the battery cell is 75-85 ℃.
Preferably, the apparatus further comprises a pressure forming device connected to the arc-shaped jig. The pressure formation device is a conventional pressure formation device, and is mainly used for providing current and voltage for a battery cell to form a stable SEI film.
The invention has the beneficial effects that:
1) the invention provides a formation method of an arc-shaped battery cell, which comprises the following steps: s1, placing the battery cell in an arc-shaped clamp, and carrying out extrusion molding on the battery cell through the arc-shaped clamp so as to finish primary preparation of the arc-shaped battery cell; and S2, after the preliminary preparation of the arc-shaped battery cell is completed, continuously maintaining the extrusion state to form the arc-shaped battery cell, and completing the integrated preparation of arc-shaped forming and forming of the battery cell. Compared with the prior art, the method has the advantages that the traditional formation preparation process of the arc-shaped battery cell is improved, the arc-shaped clamp is firstly used for preparing the preliminary arc-shaped battery cell, then the battery cell is formed in the state of maintaining the arc-shaped battery cell, the arc-shaped battery cell and the formation are integrated, the circulation of the battery cell is reduced, the punch forming process is omitted, and the automation degree of production is improved; due to the maintenance of the subsequent arc shape, the battery cell prepared finally is not easy to rebound; in addition, the improved preparation process of the invention requires small extrusion pressure, is more favorable for protecting the stability of the interior of the battery cell and is not easy to wear.
2) The arc-shaped clamp provided by the invention is provided with the convex surface and the concave surface, so that the arc-shaped forming preparation of the battery cell is completed, the arc-shaped state of the battery cell can be further stabilized in the formation process stage, and the rebound is not easy to occur.
3) The invention synchronously completes formation and arc-shaped cell formation, greatly improves the production efficiency and is more suitable for industrialized mass production.
Drawings
FIG. 1 is a flow chart of the preparation of the present invention.
Fig. 2 is a production flow chart of comparative example 1.
Fig. 3 is a schematic structural view of the arc clamp of the present invention.
Fig. 4 is a schematic structural diagram of an arc-shaped battery cell manufactured according to the present invention.
In the figure: 1-a first splint; 11-a first convex surface; 2-a second splint; 21-a first concave surface; 3-a third splint; 31-a second convex surface; 32-second concavity.
Detailed Description
A formation method of an arc-shaped battery cell comprises the following steps:
s1, placing the battery cell in an arc-shaped clamp, carrying out extrusion molding on the battery cell through the arc-shaped clamp, controlling the temperature of the surface, in contact with the battery cell, of the arc-shaped clamp to be 30-90 ℃ so as to accelerate arc-shaped forming, and completing primary preparation of the arc-shaped battery cell; the extrusion time of the arc-shaped clamp to the battery cell is 1-1440 s, the arc-shaped clamp is adjusted according to the model size of the specific battery cell, and preferably, the extrusion time of the battery cell is 80-800 s.
S2, after the preliminary preparation of the arc-shaped battery cell is completed, the extrusion state is continuously kept, the arc-shaped battery cell is formed by using a pressure forming device, the temperature of the surface, in contact with the battery cell, of the arc-shaped clamp is controlled to be 70-90 ℃, the completion of battery cell charging can be accelerated, the formation of an SEI film can be accelerated, the pole piece and the diaphragm can be tightly connected, the energy density of the battery is improved, and finally the arc-shaped preparation and the integrated preparation of the arc-shaped battery cell are completed. Preferably, the surface temperature of the arc-shaped clamp in contact with the battery cell is 75-85 ℃.
Wherein the extrusion pressure is 200 to 2000kgf/cm2The extrusion speed is 0.1-10 cm/s, and under the small pressure, the stability of the inside of the battery cell is ensured through slowly extruding the battery cell, so that the inside of the battery cell is not easily abraded. In addition, in the formation process, the electric core is extruded under the same small pressure, the arc shape of the electric core is further stabilized, and meanwhile, a certain supporting force is given to the electric core due to the existence of the concave surface, so that the arc shape of the electric core is more stabilized and is not easy to rebound. The specific extrusion pressure can be adjusted according to the size of the specific battery cell.
In addition, arc anchor clamps include first splint 1 and the relative second splint 2 that sets up with first splint 1, and first splint 1 is provided with first convex surface 11, and the opening length of first concave surface 21 is more than or equal to the length of electric core, and second splint 2 is provided with the first concave surface 21 with first convex surface 11 assorted, and the temperature on the surface that first convex surface 11 and first concave surface 21 and electric core contacted is 30 ~ 90 ℃. During formation, the temperature of the surfaces of the first convex surface 11 and the first concave surface 21, which are in contact with the battery cell, is 70-90 ℃.
Preferably, the arc-shaped clamp further comprises a plurality of third clamping plates 3 arranged at intervals between the first clamping plate 1 and the second clamping plate 2, a second convex surface 31 is arranged on one side of each third clamping plate 3, a second concave surface 32 is arranged on the other side of each third clamping plate 3, and in every two adjacent third clamping plates 3, the second convex surface 31 of one third clamping plate 3 is matched with the second concave surface 32 of the other third clamping plate 3 and is arranged oppositely. The opening length of the second concave surface 32 is greater than or equal to the length of the battery cell, and the temperature of the surfaces of the second convex surface 31 and the second concave surface 32, which are in contact with the battery cell, is 30-90 ℃. During formation, the temperature of the surfaces of the second convex surface 31 and the second concave surface 32, which are in contact with the battery cell, is 70-90 ℃.
In order to make the technical solutions and advantages of the present invention clearer, the present invention and its advantages will be described in further detail below with reference to the following detailed description and the accompanying drawings, but the embodiments of the present invention are not limited thereto.
Example 1
A formation method of an arc-shaped battery comprises the following steps:
s1, preparing a positive plate taking lithium cobaltate as a positive electrode material and a negative plate taking graphite as a negative electrode material according to a conventional lithium ion battery manufacturing process, winding the positive electrode, the negative electrode and a diaphragm into a battery cell, placing the battery cell in a punched aluminum-plastic film shell, sealing a top peak and a side seal, after vacuum drying, injecting electrolyte into the battery cell, and standing for a period of time; placing the battery cell in an arc-shaped fixture, carrying out extrusion molding on the battery cell through the arc-shaped fixture, and controlling the temperature of the surface of the arc-shaped fixture, which is in contact with the battery cell, to be 55 ℃ so as to accelerate the arc-shaped molding, thereby completing the preliminary preparation of the arc-shaped battery cell; wherein the extrusion time of the arc-shaped clamp to the battery cell is 100s, and the extrusion pressure is 500kgf/cm2The extrusion speed was 5 cm/s.
And S2, after the preliminary preparation of the arc-shaped battery cell is completed, continuing to maintain the extrusion state, forming the arc-shaped battery cell by using a pressure forming device, controlling the temperature of the surface of the arc-shaped clamp contacted with the battery cell to be 80 ℃, accelerating the completion of the charging of the battery cell and the formation of an SEI film, enabling the pole piece and the diaphragm to be tightly connected, improving the energy density of the battery, and finally completing the integrated preparation of the arc-shaped forming and the forming of the battery cell. As shown in fig. 1 and 4.
The arc-shaped clamp comprises a first clamping plate 1, a second clamping plate 2 and a plurality of third clamping plates 3, wherein the second clamping plate 2 is arranged opposite to the first clamping plate 1, and the third clamping plates 3 are arranged between the first clamping plate 1 and the second clamping plate 2 at intervals; first splint 1 is provided with first convex surface 11, second splint 2 is provided with and first concave surface 21 with first convex surface 11 assorted, the length of the opening length of first concave surface 21 is more than or equal to the length of electric core, one side of third splint 3 is provided with second convex surface 31, the opposite side of third splint 3 is provided with second concave surface 32, the opening length of second concave surface 32 is more than or equal to the length of electric core, in two adjacent third splint 3, the second convex surface 31 of a third splint 3 and the second concave surface 32 phase-match of another third splint 3 and relative setting. The temperature of the surfaces of the first convex surface 11, the second convex surface 31, the first concave surface 21 and the second concave surface 32, which are in contact with the battery cell, is 45 ℃. During formation, the temperature of the surfaces of the first convex surface 11, the second convex surface 31, the first concave surface 21, and the second concave surface 32 in contact with the cell was 80 ℃. See fig. 3.
Example 2
The difference from the example 1 is the extrusion time of the arc-shaped clamp to the battery cell. The extrusion time was 10 s.
The rest is the same as embodiment 1, and the description is omitted here.
Example 3
The difference from the example 1 is the extrusion time of the arc-shaped clamp to the battery cell. The extrusion time was 800 s.
The rest is the same as embodiment 1, and the description is omitted here.
Example 4
The difference from the example 1 is the extrusion time of the arc-shaped clamp to the battery cell. The extrusion time was 1440 s.
The rest is the same as embodiment 1, and the description is omitted here.
Example 5
The difference from the embodiment 1 is the pressing pressure of the arc-shaped clamp to the cell. The extrusion pressure was 2000kgf/cm2。
The rest is the same as embodiment 1, and the description is omitted here.
Example 6
Different from the embodiment 1, the extrusion pressure and the extrusion speed of the arc-shaped clamp to the battery cell are adopted. The extrusion pressure was 1000kgf/cm2The extrusion speed was 1 cm/s.
The rest is the same as embodiment 1, and the description is omitted here.
Example 7
Different from the embodiment 1, the extrusion pressure and the extrusion speed of the arc-shaped clamp on the battery cellAnd (4) degree. The extrusion pressure was 200kgf/cm2The extrusion speed was 10 cm/s.
The rest is the same as embodiment 1, and the description is omitted here.
Example 8
The difference from the example 1 is the temperature of the surface of the arc-shaped jig in contact with the battery cell in the step S1. The temperature of the surface of the arc-shaped jig in contact with the cell in step S1 was 70 ℃.
The rest is the same as embodiment 1, and the description is omitted here.
Example 9
The difference from example 1 is the temperature of the surface of the arc-shaped holder in contact with the cell. In the step S1, the temperature of the surface of the arc-shaped clamp in contact with the battery cell is 30 ℃; the temperature of the surface of the arc-shaped fixture in contact with the battery cell in step S2 was 90 ℃.
The rest is the same as embodiment 1, and the description is omitted here.
Comparative example 1
A formation method of an arc-shaped battery cell comprises the following steps:
s1, according to the conventional manufacturing process of the lithium ion battery, a positive plate taking lithium cobaltate as a positive material and a negative plate taking graphite as a negative material are manufactured, the positive electrode, the negative electrode and the diaphragm are wound into a battery cell, the battery cell is placed in a punched aluminum-plastic film shell, a top peak and a side seal are sealed, after vacuum drying, electrolyte is injected into the battery cell, and then the battery cell is placed in a standing mode.
S2, then placing the battery cell into pressure formation equipment for formation, and completing the formation stage of the battery cell; and standing for a period of time, and vacuumizing the battery cell to perform secondary sealing and molding.
S3, putting the battery cell which is subjected to secondary sealing into an arc-shaped clamp for punch forming; the pressing pressure was 5000kgf/cm2And finishing the formation of the battery cell and the arc forming preparation. As shown in fig. 2.
The arc-shaped batteries are obtained by respectively completing the subsequent preparation procedures on the same batch of battery cores prepared in the embodiments 1-9 and the comparative example 1, and then the performance tests are carried out under the same conditions. The test results are shown in Table 1.
Table 1 performance test results of arc-shaped batteries
Figure BDA0002252333280000091
From the test results of examples 1-9 and comparative example 1, the test results of most arc-shaped batteries prepared by the method are more excellent than the test results of comparative example 1. If factors such as stamping pressure, stamping time and the like are well controlled, the improved forming method can greatly improve the performance of the arc-shaped battery, such as embodiments 1, 6-7. The improved scheme of the invention is mainly characterized in that the arc-shaped battery cell is firstly prepared and formed, then the battery cell is formed by continuously keeping a certain pressure state, so that the arc-shaped forming time is prolonged to stabilize the arc-shaped form, and the arc-shaped prefabrication is carried out before the formation, so that the required extrusion pressure is low, and the damage to the inside of the battery cell is not easy to cause. Compared with the large-pressure extrusion molding in the prior art, the scheme of the invention protects the stability of the interior of the battery cell, the small-pressure extrusion is an important factor for improving the performance of the arc-shaped battery, and the extrusion state is still kept during formation, so that the possible subsequent rebound phenomenon of the battery cell is prevented; in addition, compared with the prior art, the invention simplifies the preparation process flow of the arc-shaped battery cell and greatly improves the industrial production efficiency.
The standard parts used in the invention can be purchased from the market, the special-shaped parts can be customized according to the description of the specification and the accompanying drawings, the specific connection mode of each part adopts conventional means such as bolts, rivets, welding and the like mature in the prior art, the machines, the parts and equipment adopt conventional models in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, so that the detailed description is omitted.
It will be evident to those skilled in the art from the foregoing disclosure and teachings that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should understand that the embodiments as a whole may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (10)

1. A formation method of an arc-shaped battery cell is characterized by comprising the following steps:
s1, placing the battery cell in an arc-shaped clamp, and carrying out extrusion molding on the battery cell through the arc-shaped clamp so as to finish primary preparation of the arc-shaped battery cell;
and S2, after the preliminary preparation of the arc-shaped battery cell is completed, continuously maintaining the extrusion state to form the arc-shaped battery cell, and completing the integrated preparation of arc-shaped forming and forming of the battery cell.
2. The method for forming the arc-shaped battery cell according to claim 1, wherein the extrusion pressure is 200-2000 kgf/cm2。
3. The method for forming the arc-shaped battery cell of claim 1, wherein in step S1, the time for pressing the battery cell is 1-1440S.
4. The method for forming the arc-shaped battery cell according to claim 3, wherein in the step S1, the time for pressing the battery cell is 80-800S.
5. The method for forming the arc-shaped battery cell according to claim 1, wherein in the step S1, the temperature of the surface of the arc-shaped clamp, which is in contact with the battery cell, is 30-90 ℃.
6. The method for forming the arc-shaped battery cell according to claim 1, wherein in step S2, the temperature of the surface of the arc-shaped clamp in contact with the battery cell is 70-90 ℃.
7. The equipment for the formation method of the arc-shaped battery cell of any one of claims 1 to 6, which comprises an arc-shaped clamp, wherein the arc-shaped clamp comprises a first clamp plate and a second clamp plate arranged opposite to the first clamp plate, the first clamp plate is provided with a first convex surface, and the second clamp plate is provided with a first concave surface matched with the first convex surface.
8. The apparatus for forming the arc-shaped battery cell according to claim 7, wherein the length of the opening of the first concave surface is greater than or equal to the length of the battery cell.
9. The apparatus for forming an arc-shaped battery cell according to claim 7, wherein the arc-shaped fixture further includes a plurality of third clamping plates disposed at intervals between the first clamping plate and the second clamping plate, a second convex surface is disposed on one side of each third clamping plate, a second concave surface is disposed on the other side of each third clamping plate, and in two adjacent third clamping plates, the second convex surface of one third clamping plate matches and is disposed opposite to the second concave surface of the other third clamping plate.
10. The apparatus for forming the arc-shaped battery cell of claim 8, wherein the length of the opening of the second concave surface is greater than or equal to the length of the battery cell.
CN201911038946.6A 2019-10-29 2019-10-29 Formation method of arc-shaped battery cell and equipment used by same Pending CN110890579A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114430073A (en) * 2022-02-09 2022-05-03 湖南立方新能源科技有限责任公司 Arc-shaped battery cell structure and processing method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114430073A (en) * 2022-02-09 2022-05-03 湖南立方新能源科技有限责任公司 Arc-shaped battery cell structure and processing method

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