CN110380100B - Method for manufacturing battery cell - Google Patents
Method for manufacturing battery cell Download PDFInfo
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- CN110380100B CN110380100B CN201910672995.9A CN201910672995A CN110380100B CN 110380100 B CN110380100 B CN 110380100B CN 201910672995 A CN201910672995 A CN 201910672995A CN 110380100 B CN110380100 B CN 110380100B
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- pole
- insulating layer
- pole group
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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
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
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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
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/005—Devices for making primary cells
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- 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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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention provides a method for manufacturing a battery cell, which comprises the following steps: sequentially laminating the positive pole piece, the isolating film and the negative pole piece into a pole group; pasting an insulating layer on the outer surface of the pole group; connecting a plurality of said pole sets into a pole set assembly; attaching a binding piece to the outer surface of the pole group assembly; and installing the pole group assembly in the shell of the battery core. The battery cell produced by the manufacturing method can prevent the pole pieces from being separated and the pole pieces from being staggered, and can avoid the short circuit of the battery cell, thereby improving the use safety of the battery cell, improving the smoothness of the battery cell, and avoiding the welding dust from entering the inside of the battery cell after the outer surface of the battery cell is pasted with the insulating layer.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a method for manufacturing a battery core.
Background
In the correlation technique, after positive pole piece, negative pole piece and barrier film range upon range of to be the utmost point group, paste the binding at the surface of utmost point group, can't avoid the pole piece to deviate from at utmost point group hot pressing design in-process, and to the utmost point group that the hot pressing effect is not good, the pole piece is the fault bed easily, leads to the electric core to take place the short circuit easily. And after the binding piece is attached to the outer surface of the pole group, the stress at the tightening point of the binding piece is large, so that the stress of the whole pole group is uneven, and diaphragm wrinkles appear on the binding piece accessories after the pole group is subjected to hot press molding. Meanwhile, after the existing binding piece is attached to the pole group, the pole group in the binding point area is stressed greatly and has a compact structure, the pole group in the binding point area is not stressed slightly and has a loose structure, and the produced battery cell has poor smoothness and the service performance of the battery cell is influenced.
Disclosure of Invention
In view of the above, the present invention is directed to a method for manufacturing a battery cell, so as to solve the problem that a layer dislocation is easily generated in a battery cell.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a manufacturing method of a battery cell comprises the following steps: sequentially laminating the positive pole piece, the isolating film and the negative pole piece into a pole group; pasting an insulating layer on the outer surface of the pole group; connecting a plurality of said pole sets into a pole set assembly; attaching a binding piece to the outer surface of the pole group assembly; and installing the pole group assembly in the shell of the battery core.
In some examples of the invention, "attaching an insulating layer to an outer surface of the pole group" includes: and dividing the insulating layer into a first region insulating layer, a second region insulating layer and a third region insulating layer, wherein the first region insulating layer, the second region insulating layer and the third region insulating layer are respectively attached to the first region, the second region and the third region of the pole group.
In some examples of the invention, the first region and the second region are arranged side by side and extend from the first end to the second end of the pole group, and the third region is arranged side by side with the first region and the second region.
In some examples of the present invention, the pole group has a length W, the pole group has a width H1+ H2, the pole group has a thickness H, the first region insulating layer and the second region insulating layer have a width H2, the first region insulating layer and the second region insulating layer have a length W + H, the third region insulating layer has a body length W, the body width of the third region insulating layer is 2H1+ H, and sub-insulating layers having a width H1 and a length H are disposed on both sides of the body.
In some examples of the invention, the first region and the second region are symmetrical in a length direction of the pole group.
In some examples of the invention, "connecting a plurality of the pole groups as a pole group assembly" includes stacking a plurality of the pole groups in sequence and welding as the pole group assembly.
In some examples of the invention, the tie down extends from an upper surface of the pole set assembly to a lower surface of the pole set assembly in a thickness direction of the pole set assembly.
In some examples of the invention, the width of the bundle is H3, satisfying the relationship: h3 is more than or equal to 9mm and less than or equal to 11 mm.
In some examples of the present invention, the binding member is plural, and the plural binding members are arranged at intervals in a circumferential direction of the pole group assembly.
In some examples of the invention, the pole group has a length W, the pole group has a width H1+ H2, the tie down disposed along the width of the pole group has a length from the end of the tie down to the edge of the pole group assembly of (H1+ H2-2H3)/3 mm; the binding piece is arranged along the length direction of the pole group, and the length from the end part of the binding piece to the edge of the pole group assembly is (W-2H3)/3 mm.
Compared with the prior art, the manufacturing method of the battery cell has the following advantages:
according to the manufacturing method of the battery cell, the battery cell produced by the manufacturing method can prevent the pole pieces from falling off and the pole pieces from being staggered, can avoid the short circuit of the battery cell, can improve the use safety of the battery cell and the smoothness of the battery cell, and can avoid welding dust from entering the inside of the battery cell after the insulating layer is adhered to the outer surface of the battery cell.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of a manufacturing method according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method of manufacturing according to an embodiment of the present invention;
FIG. 3 is a schematic view of an insulating layer attached to the outer surface of a pole set according to an embodiment of the present invention;
FIG. 4 is a schematic view of a strap assembly according to an embodiment of the present invention attached to an outer surface of a pole set assembly;
FIG. 5 is an expanded view of the first region insulation layer according to the embodiment of the present invention;
fig. 6 is a schematic expanded view of a third insulating layer according to an embodiment of the invention;
fig. 7 is a top view of a pole set according to an embodiment of the invention.
Description of reference numerals:
a pole group 1; a first end 11; a second end 12; a first region 13; a second region 14; third region 15
An insulating layer 2; a first region insulating layer 21; a second region insulating layer 22; a third region insulating layer 23;
a pole group assembly 3; an upper surface 31;
a binding 4; and a tab 5.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
When the existing manufacturing method is used for producing the battery core, the electrode group is subjected to hot-pressing and shaping, the electrode group is preheated for 15-30min before hot pressing, the internal and external temperatures of the electrode group are raised to soften organic adhesive polymer coating particles, then hot pressing is carried out under the high pressure of 2-3T, so that the isolating membrane and the pole piece are fully bonded, but the organic adhesive polymer coating particles are solidified, even if the good bonding effect cannot be achieved under the hot-pressing condition, the isolating membrane and the pole piece are staggered, under the condition, the adhesive force between the coating and the pole piece is weakened, the coating force for inhibiting the thermal shrinkage of the isolating membrane is reduced, so that the short circuit between the positive pole piece and the negative pole piece after the battery core is overheated is difficult to prevent, particularly, when the battery is applied to a vehicle, the staggered layer is very easy to occur between the pole pieces in the battery when the vehicle shakes, affecting the safety of the battery.
In the conventional battery cell assembly process, after the lamination of the positive pole piece, the isolating membrane and the negative pole piece is completed, the binding piece is pasted on the pole group, the core combination of the pole group is pasted with the binding piece after the welding of the pole group 1 is completed, and the insulating layer is pasted on the surface of the pole group before the pole group is placed into the shell.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1 to 7, a method for manufacturing a battery cell according to an embodiment of the present invention includes the following steps: stacking up positive pole piece, barrier film, negative pole piece in proper order for utmost point group 1, then pasting insulating layer 2 at the surface of utmost point group 1, insulating layer 2 can be insulating adhesive tape, then connect a plurality of utmost point groups 1 as utmost point group subassembly 3, then paste binding 4 at the surface of utmost point group subassembly 3, binding 4 can be for binding the sticky tape, will utmost point group subassembly 3 at last and install in the casing of electric core.
When the manufacturing method of the application is used for producing the battery core, after the positive pole piece, the isolating membrane and the negative pole piece are laminated into the pole group 1, the insulating layer 2 is firstly pasted on the outer surface of the pole group 1, then the binding piece 4 is pasted on the outer surface of the pole group component 3, and then the pole group component 3 is installed in the shell of the battery core. Set up like this and can save the process of pasting insulating layer 2 on utmost point group subassembly 3 after utmost point group subassembly 3 closes the core, can promote the production efficiency of electric core, and, positive pole piece, the barrier film, negative pole piece range upon range of directly pastes insulating layer 2 behind the utmost point group 1, can wrap up utmost point group 1 evenly, the atress of utmost point group 1 is balanced, through experimental verification, can make the structure of utmost point group 1 compacter, thereby can prevent that the pole piece from deviating from, also can prevent the pole piece fault bed, and then can avoid electric core to take place the short circuit, also can promote the safety in utilization of electric core, and simultaneously, also can avoid welding the dust to get into utmost point group 1 inside, can guarantee the operational reliability of electric core. In addition, bind 4 paste back on utmost point group subassembly 3, can make utmost point group subassembly 3 receive even power of binding, can promote the planarization of electric core to can guarantee the performance of electric core.
Therefore, the battery cell produced by the manufacturing method can prevent the pole pieces from being separated, can also prevent the pole pieces from being staggered, can avoid the short circuit of the battery cell, can improve the use safety of the battery cell, can also improve the smoothness of the battery cell, and can avoid welding dust from entering the inside of the battery pack 1 after the insulating layer 2 is pasted on the outer surface of the battery pack 1.
In some embodiments of the present invention, as shown in fig. 3, 5 and 6, "attaching the insulating layer 2 on the outer surface of the pole group 1" may include: divide insulating layer 2 into first regional insulating layer 21, second regional insulating layer 22 and third regional insulating layer 23, first regional insulating layer 21, second regional insulating layer 22 and third regional insulating layer 23 paste respectively on the first region 13 of utmost point group 1, second region 14 and third region 15, so set up and can all paste insulating layer 2 with the whole surface of utmost point group 1 basically, can be with the tighter reality of utmost point group 1 parcel, thereby can prevent the pole piece staggered floor better, also can guarantee the planarization of utmost point group 1 better. And, insulating layer 2 has insulating properties, can avoid electric leakage of electric core or take place the short circuit to can further guarantee the safety in utilization of electric core.
In some embodiments of the present invention, as shown in fig. 7, the first region 13 and the second region 14 are arranged side by side, and the first region 13 and the second region 14 are both arranged to extend from the first end 11 to the second end 12 of the pole group 1, and the third region 15 is arranged side by side with the first region 13 and the second region 14, wherein the first end 11 of the pole group 1 is the front end in fig. 7, and the second end 12 of the pole group 1 is the rear end in fig. 3, so that the insulating layer 2 can be attached to the entire outer surface of the pole group 1, and the arrangement positions of the first region 13, the second region 14 and the third region 15 can be more reasonable.
In some embodiments of the present invention, as shown in fig. 3, 5 and 6, the length of the pole group 1 is W, the width of the pole group 1 is H1+ H2, the thickness of the pole group 1 is H, the widths of the first region insulating layer 21 and the second region insulating layer 22 are H2, the lengths of the first region insulating layer 21 and the second region insulating layer 22 are W + H, the length of the body of the third region insulating layer 23 is W, the width of the body of the third region insulating layer 23 is 2H1+ H, and the sub-insulating layers 2 having the width of H1 and the length of H are disposed on both sides of the body, wherein the widths of the first region 13 and the second region 14 are H2, the lengths of the first region 13 and the second region 14 are W + H, the length of the body of the third region 15 is W, the width of the body of the third region 15 is 2H1+ H, and the sub-regions having the width of H1 and the length of H are disposed on both sides of the body, such that the area of the first region 21 is equal to the area of the first region 13, the area of the second region insulating layer 22 may be equal to the area of the second region 14, the area of the third region insulating layer 23 may be equal to the area of the third region 15, and the first region insulating layer 21, the second region insulating layer 22, and the third region insulating layer 23 may be attached to the entire first region 13, the entire second region 14, and the entire third region 15.
In some embodiments of the present invention, as shown in fig. 7, the first region 13 and the second region 14 are symmetrical in the length direction of the pole group 1, and it should be noted that the length direction of the pole group 1 refers to the left-right direction in fig. 7, such an arrangement can make the areas of the first region 13 and the second region 14 equal, and after the insulating layer 2 is attached to the first region 13 and the second region 14, the stress on the pole group 1 can be more balanced, so that the pole piece dislocation can be further prevented.
In some embodiments of the present invention, "connecting a plurality of pole groups 1 to a pole group assembly 3" may include sequentially laminating a plurality of pole groups 1 together and welding to form a pole group assembly 3, it being explained that after the insulating layer 2 is attached to the outer surface of the pole group 1, the plurality of pole groups 1 are laminated together, for example: the two are laminated together and then the two pole groups 1 are welded together to form the pole group assembly 3, so that the working purpose of producing the pole group assembly 3 can be achieved.
In some embodiments of the present invention, as shown in fig. 4, in the thickness direction of the pole group assembly 3, the binding member 4 extends from the upper surface 31 of the pole group assembly 3 to the lower surface of the pole group assembly 3, so as to bind the plurality of pole group assemblies 3 together, and the plurality of pole group assemblies 3 can be prevented from being separated from each other, so that the overall structural strength of the plurality of pole group assemblies 3 can be improved, and the structure of the pole group assembly 3 can be made more compact, so as to further prevent pole piece dislocation.
In some embodiments of the invention, as shown in fig. 4, the width of the bundle 4 is set to H3, satisfying the relationship: 9mm ≦ H3 ≦ 11mm, for example: set up the width of binding 4 into 10mm, so set up and to guarantee that binding 4 has sufficient width, can guarantee that binding 4 has sufficient area that compresses tightly to utmost point group subassembly 3, thereby can guarantee utmost point group subassembly 3's structural strength, and, because the effect of power is mutual, when binding 4 compresses tightly utmost point group subassembly 3, utmost point group subassembly 3 also can give 4 power of binding, set up the structural strength that can guarantee binding 4 like this, can prevent binding 4 fracture, thereby can guarantee binding 4's operational reliability.
In some embodiments of the present invention, the binding 4 may be provided in plurality, and the plurality of binding 4 are arranged at intervals in a circumferential direction of the pole group assembly 3, as shown in fig. 4, each of the left and right sides of the pole group assembly 3 may be provided with two binding 4, the two binding 4 of the left side of the pole group assembly 3 are uniformly arranged at the left side of the pole group assembly 3, the two binding 4 of the right side of the pole group assembly 3 are uniformly arranged at the right side of the pole group assembly 3, the front side of the pole group assembly 3 may be provided with one binding 4, the binding 4 is located between the two tabs 5 and at a middle position of the front side of the pole group assembly 3, the rear side of the pole group assembly 3 may be provided with two binding 4, and the two binding 4 of the rear side of the pole group assembly 3 are uniformly arranged at the rear side of the pole group assembly 3. So set up and can further guarantee that binding 4 has sufficient area that compresses tightly to utmost point group subassembly 3 to can further guarantee the structural strength of utmost point group subassembly 3, and then can further prevent the pole piece staggered floor.
In some embodiments of the present invention, as shown in fig. 4, the length of the pole group 1 is W, the width of the pole group 1 is H1+ H2, the tie members 4 are spaced apart in the width direction of the pole group 1, the length from the end of the tie member 4 to the edge of the pole group 1 is (H1+ H2-2H3)/3mm, the tie members 4 are spaced apart in the length direction of the pole group 1, and the length from the end of the tie member 4 to the edge of the pole group assembly 3 is (W-2H3)/3mm, so that the attachment area of the tie member 4 to the pole group assembly 3 can be ensured, the tie member 4 can be prevented from falling off the pole group assembly 3, and the attachment reliability of the tie member 4 can be ensured.
The manufacturing method of the present application will be understood in detail with reference to fig. 2.
After positive pole pieces, an isolating membrane and negative pole pieces are sequentially stacked into a pole group 1, an insulating layer 2 is pasted on the outer surface of the pole group 1, then the pole group 1 is preheated and hot-pressed to enable the pole group 1 to be shaped, then pole group prewelding is carried out on a plurality of pole groups 1, short circuit detection is carried out on the plurality of pole groups 1, tabs 5 are cut on the pole group 1, ultrasonic final welding is carried out, welding, printing and rubberizing are carried out, welding plate welding is carried out, the plurality of pole groups 1 are connected together, then the plurality of pole groups 1 are stacked into a pole group assembly 3, then binding pieces 4 are pasted outside the pole group assembly 3, then the pole group assembly 3 is assembled into a shell, then cover plate peripheral welding is carried out, whether liquid leakage of a battery core exists or not is detected, finally, code printing is carried out on the battery core, and production of the battery core is completed.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A method for manufacturing a battery cell is characterized by comprising the following steps:
sequentially laminating a positive pole piece, an isolating film and a negative pole piece into a pole group (1);
an insulating layer (2) is adhered to the outer surface of the pole group (1);
connecting a plurality of said pole groups (1) into a pole group assembly (3);
attaching a binding piece (4) to the outer surface of the pole group assembly (3);
mounting the pole group assembly (3) in a housing of the cell;
the method for sticking the insulating layer (2) on the outer surface of the pole group (1) comprises the following steps: dividing the insulating layer (2) into a first region insulating layer (21), a second region insulating layer (22), and a third region insulating layer (23);
the length of utmost point group (1) is W, the width of utmost point group (1) is H1+ H2, the thickness of utmost point group (1) is H, first regional insulating layer (21) with the width of second regional insulating layer (22) is H2, first regional insulating layer (21) with the length of second regional insulating layer (22) is W + H, the body length of third regional insulating layer (23) is W, third regional insulating layer (23) the body width is 2H1+ H, and the both sides of body are provided with wide sub-insulating layer (2) that are H1, length are H.
2. The method for manufacturing the battery cell according to claim 1, wherein the step of attaching the insulating layer (2) to the outer surface of the pole group (1) further comprises: the first region insulating layer (21), the second region insulating layer (22), and the third region insulating layer (23) are attached to the first region (13), the second region (14), and the third region (15) of the pole group (1), respectively.
3. The method of manufacturing a cell according to claim 2, characterized in that the first region (13) and the second region (14) are arranged side by side and extend from the first end (11) to the second end (12) of the pole group (1), and the third region (15) is arranged side by side with the first region (13) and the second region (14).
4. The method of manufacturing a cell according to claim 3, characterized in that the first region (13) and the second region (14) are symmetrical in the length direction of the pole group (1).
5. The method of manufacturing a battery cell according to claim 1, wherein "connecting a plurality of the pole groups (1) into a pole group assembly (3)" includes stacking and welding a plurality of the pole groups (1) one after another into the pole group assembly (3).
6. The method of manufacturing a battery cell according to claim 5, wherein the tie-down (4) extends from an upper surface (31) of the pole group assembly (3) to a lower surface of the pole group assembly (3) in a thickness direction of the pole group assembly (3).
7. The method for manufacturing the battery cell according to claim 5, wherein the width of the binding member (4) is H3, and the relation is satisfied: h3 is more than or equal to 9mm and less than or equal to 11 mm.
8. The method of manufacturing a battery cell according to claim 7, wherein the binding member (4) is plural, and the binding members (4) are arranged at intervals in a circumferential direction of the pole group assembly (3).
9. The method for manufacturing the battery cell according to claim 8, wherein the length of the pole group (1) is W, the width of the pole group (1) is H1+ H2, the binding members (4) are arranged along the width direction of the pole group (1), and the length from the end of the binding member (4) to the edge of the pole group assembly (3) is (H1+ H2-2H3)/3 mm;
the binding pieces (4) are arranged along the length direction of the pole group (1), and the length from the end parts of the binding pieces (4) to the edge of the pole group assembly (3) is (W-2H3)/3 mm.
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| CN201910672995.9A CN110380100B (en) | 2019-07-24 | 2019-07-24 | Method for manufacturing battery cell |
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| CN111293347B (en) * | 2020-04-08 | 2023-03-28 | 湖北亿纬动力有限公司 | Battery production process |
| CN114006053A (en) * | 2021-10-29 | 2022-02-01 | 蜂巢能源科技有限公司 | Lithium ion battery assembly process and lithium ion battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104303332A (en) * | 2012-04-05 | 2015-01-21 | 株式会社Lg化学 | Battery cell having stair-like structure |
| CN104488129A (en) * | 2013-02-15 | 2015-04-01 | 株式会社Lg化学 | Electrode assembly |
| JP2019096392A (en) * | 2017-11-17 | 2019-06-20 | 株式会社豊田自動織機 | Manufacturing method of bipolar battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202019028U (en) * | 2011-01-26 | 2011-10-26 | 惠州Tcl金能电池有限公司 | Cell core of lithium cell and lithium cell |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104303332A (en) * | 2012-04-05 | 2015-01-21 | 株式会社Lg化学 | Battery cell having stair-like structure |
| CN104488129A (en) * | 2013-02-15 | 2015-04-01 | 株式会社Lg化学 | Electrode assembly |
| JP2019096392A (en) * | 2017-11-17 | 2019-06-20 | 株式会社豊田自動織機 | Manufacturing method of bipolar battery |
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Address after: No.8899 Xincheng Avenue, Jintan District, Changzhou City, Jiangsu Province Patentee after: SVOLT Energy Technology Co.,Ltd. Address before: 213200 168 Huacheng Road, Jintan District, Changzhou, Jiangsu Patentee before: SVOLT Energy Technology Co.,Ltd. |