CN114614076A - Secondary battery cell manufacturing method and secondary battery cell thereof - Google Patents
Secondary battery cell manufacturing method and secondary battery cell thereof Download PDFInfo
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- CN114614076A CN114614076A CN202210275384.2A CN202210275384A CN114614076A CN 114614076 A CN114614076 A CN 114614076A CN 202210275384 A CN202210275384 A CN 202210275384A CN 114614076 A CN114614076 A CN 114614076A
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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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion 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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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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
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside 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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Abstract
The invention relates to a method for manufacturing a secondary battery cell and the secondary battery cell. The manufacturing method of the secondary battery cell comprises the following steps: covering and compounding a first diaphragm on one side of the negative electrode, wherein the distances from two sides of the first diaphragm in the width direction to the corresponding two sides of the negative electrode are equal; covering and compounding a second diaphragm on the other side of the negative electrode, wherein the distances from two sides of the second diaphragm in the width direction to the corresponding two sides of the negative electrode are equal; compounding a positive electrode on the other side of the first diaphragm or the second diaphragm, which is away from the negative electrode, wherein the distances from two sides of the first diaphragm or the second diaphragm in the width direction to the corresponding two sides of the positive electrode are equal; and winding a complex formed by the first diaphragm, the negative electrode, the second diaphragm and the positive electrode into a secondary battery cell along the extending direction of the complex. When the method for manufacturing the secondary battery cell is used for manufacturing, the alignment degree of the first diaphragm, the second diaphragm, the anode and the cathode is high, and the problem of lithium precipitation in the prior art is effectively solved.
Description
Technical Field
The invention relates to the technical field of lithium ion secondary battery production and manufacture, in particular to a secondary battery cell manufacturing method and a secondary battery cell thereof.
Background
Lithium ion batteries are a new favorite in the energy community because of their numerous advantages, such as high energy density, long cycle life, good safety, flexible design, etc. At present, lithium ion batteries are widely applied to the fields of portable electronic products, electric automobiles, aerospace and the like.
With the increase of public attention and investment on the lithium battery industry, the lithium battery industry develops rapidly in recent years, the competition in the industry is more intense, and the pursuit of the public on the quality of the lithium ion battery is correspondingly high. For a winding type battery core, in order to avoid the phenomenon of lithium separation of the battery, the negative plate is over-designed generally during design, that is, the size of the negative plate is larger than that of the positive plate, and the positive plate completely falls into the negative plate, which is called as Overhang design. However, in the prior art, the diaphragm can perform process deviation correction and winding deviation correction after static elimination, and the positive and negative pole pieces cannot ensure the alignment degree in the process, so that the positive pole piece does not fall in the range of the negative pole piece completely, and the normal implementation of Overhang design cannot be ensured. Once the Overhang design fails, the lithium ion battery can generate a lithium separation phenomenon, and the performance and the safety performance of the lithium ion battery are influenced.
Disclosure of Invention
Based on the method, the invention provides the secondary battery cell and the manufacturing method thereof, and the composite sequence and the composite position of the diaphragm, the negative electrode and the positive electrode are controlled, so that the positive electrode and the negative electrode can be aligned, and the lithium precipitation phenomenon is effectively prevented.
The invention discloses a method for manufacturing a secondary battery cell, which comprises the following steps:
covering and compounding a first diaphragm on one side of the negative electrode, wherein the distances from two sides of the first diaphragm in the width direction to the corresponding two sides of the negative electrode are equal;
covering and compounding a second diaphragm on the other side of the negative electrode, wherein the distances from two sides of the second diaphragm in the width direction to the corresponding two sides of the negative electrode are equal;
compounding a positive electrode on the other side of the first diaphragm or the second diaphragm, which is away from the negative electrode, wherein the distances from two sides of the first diaphragm or the second diaphragm in the width direction to the corresponding two sides of the positive electrode are equal;
and winding a complex formed by the first diaphragm, the negative electrode, the second diaphragm and the positive electrode into a secondary battery cell along the extending direction of the complex.
In some embodiments, the first membrane has a width that is the same as a width of the second membrane.
In some embodiments, the first separator is aligned with an end of the second separator in a winding direction.
In some embodiments, the winding direction end of the second separator or the first separator combined with the positive electrode does not extend beyond the winding direction end of the first separator or the second separator combined with the positive electrode.
In some of these embodiments, the excess distance is 0.5mm to 1 mm.
In some embodiments, the composite is wound in a direction toward the negative electrode side.
In some embodiments, the distance from the edge of the first separator to the corresponding edge of the negative electrode is 1.5mm to 3mm, and the distance from the edge of the second separator to the corresponding edge of the negative electrode is 1.5mm to 3 mm.
In some embodiments, when the first diaphragm and the negative electrode are compounded, the compounding pressure is less than or equal to 6 tons, the temperature of a hot-pressing roller is controlled to be 75-100 ℃, and the gap between the rollers is 20-30 μm; when the second diaphragm is compounded with the negative electrode, the compounding pressure is 2 tons to 4 tons, the temperature of a hot-pressing roller is controlled to be 50 ℃ to 75 ℃, and the gap between the rollers is 20 mu m to 30 mu m; when the anode is compounded with the first diaphragm or the second diaphragm, the compound pressure is less than or equal to 6 tons, the temperature of the hot-pressing roller is controlled to be 75-100 ℃, and the gap between the rollers is 20-50 mu m.
In some embodiments, the method for manufacturing a secondary battery cell further includes: and a third diaphragm is coated outside the secondary battery core.
The invention also discloses a secondary battery cell which is prepared by the manufacturing method of any one of the secondary battery cells.
Advantageous effects
According to the manufacturing method of the secondary battery cell, only two monomers participating in compounding are strictly controlled in each step, so that on one hand, the positions of the monomers participating in compounding can be firmly set, the alignment degree of the first diaphragm, the second diaphragm, the anode and the cathode is high, and the problem of lithium precipitation in the prior art can be effectively solved; on the other hand, the intermediate product compounded in each step of the method for manufacturing the secondary battery cell does not have the wrinkling phenomenon, and the finally manufactured finished product secondary battery cell has good quality.
Drawings
Fig. 1 is a flowchart of a secondary battery cell manufacturing method of the invention in some embodiments;
fig. 2 is a schematic view showing the positions of a first separator and a negative electrode in some embodiments of the method for manufacturing a secondary battery cell of the present invention;
fig. 3 is a schematic position diagram of a first separator, a second separator and a negative electrode in some embodiments of the method for manufacturing a secondary battery cell of the present invention;
fig. 4 is a schematic position diagram of a first separator, a second separator, a negative electrode and a positive electrode in some embodiments of the method for manufacturing a secondary battery cell of the invention;
wherein 1 is a negative electrode, 2 is a first separator, 3 is a second separator, and 4 is a positive electrode.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Example 1
In this embodiment, the present invention discloses a method for manufacturing a secondary battery cell, as shown in fig. 1, the method for manufacturing a secondary battery cell includes the following steps:
(1) covering and compounding a first diaphragm on one side of the negative electrode, wherein the distances from two sides of the first diaphragm in the width direction to the corresponding two sides of the negative electrode are equal;
(2) covering and compounding a second diaphragm on the other side of the negative electrode, wherein the distances from two sides of the second diaphragm in the width direction to the corresponding two sides of the negative electrode are equal;
(3) compounding a positive electrode on the other side of the first diaphragm or the second diaphragm, which is away from the negative electrode, to form a compound body, wherein the distances from two sides of the first diaphragm or the second diaphragm in the width direction to the corresponding two sides of the positive electrode are equal;
(4) and winding the composite body into a secondary battery cell along the extending direction of the composite body.
In this embodiment, the secondary battery cell manufacturing method of the present invention severely limits the number of cells participating in each recombination. Specifically, as shown in fig. 2, in the structure diagram of each cell in step (1), only two cells, namely, the first separator 2 and the negative electrode 1, participate in the compounding, which enables the present invention to precisely control the relative positions of the first separator 2 and the negative electrode 1, so that the distances from both sides of the first separator 2 in the width direction to the corresponding two sides of the negative electrode 1 are equal, that is, the negative electrode 1 is ensured to be located at the middle position of the first separator 2. Moreover, because only two units participating in compounding are provided, relevant parameters during compounding can be accurately adjusted, the cathode 1 can be accurately and firmly compounded on the first diaphragm 2 in the step (1), and the cathode 1 cannot be displaced relative to the first diaphragm 2 due to external force interference in the subsequent compounding processing step. In addition, because only two monomers are involved in compounding, the bonding quality of the negative electrode 1 and the first diaphragm 2 can be easily controlled, and the wrinkling phenomenon possibly occurring in the prior art is avoided. In conclusion, the step (1) can prepare the first lamination sheet with high alignment degree and high quality without the problem of wrinkling.
In step (2), as shown in fig. 3, the first lamination sheet is further compounded with the second diaphragm 3. Similarly, only two single bodies, namely the second diaphragm 3 and the first film covering sheet, exist in the step (2), so that the method for manufacturing the secondary battery cell can accurately control the relative positions of the second diaphragm 3 and the first film covering sheet. Specifically, the distances from both sides of the negative electrode 1 in the width direction in the first coating film sheet to the corresponding both sides of the second separator 3 in the width direction are made equal, that is, the negative electrode 1 is secured at the middle position of the second separator 3. Thus, the first separator 2, the second separator 3, and the negative electrode 1 are aligned. Similarly to the step (1), only two monomers involved in compounding in the step (2) are provided, and related parameters during compounding can be accurately adjusted, so that the second diaphragm 3 in the step (2) can be accurately, firmly and adherently compounded on the first diaphragm, and the negative diaphragm without the problem of wrinkling is formed.
On this basis, as shown in fig. 4, in step (3), the positive electrode 4 is combined with the other side of the first separator 2 or the second separator 3, which is away from the negative electrode 1, to form a combined body, and the distances from both sides of the first separator 2 or the second separator 3 in the width direction to the corresponding both sides of the positive electrode 4 are equal. Since the alignment degree of the negative electrode coating film is high, the distances from both sides in the width direction of the positive electrode 4 to both sides in the width direction of the first separator 2 or the second separator 3 are controlled to be equal in step (3), which substantially ensures that the first separator 2, the negative electrode 1, the second separator 3, and the positive electrode 4 are completely aligned. As described in the background art, the reason why the lithium deposition problem exists in the prior art is that the negative electrode 1 and the positive electrode 4 cannot be aligned, but the method for manufacturing the secondary battery cell of the present invention controls the sequence of steps, and each unit in each step of compounding has a definite reference object, so that the negative electrode 1 and the positive electrode 4 can be aligned to a very high degree, and the lithium deposition phenomenon is effectively prevented.
Besides, the step (3) has the same considerations as the steps (1) and (2), and only two monomers, namely the negative electrode coating film and the positive electrode 4, participate in compounding in the step (3), so that the positive electrode 4 and the negative electrode coating film can be firmly attached to ensure that the positions are fixed, and the two monomers do not generate wrinkles. After the steps (1), (2) and (3) are completed, the composite sheet to be wound is prepared, and the composite sheet has high alignment degree and good quality.
And (4) finally, winding the composite sheet to be wound obtained in the step (3) to obtain a finished product of the secondary battery cell.
In summary, in the method for manufacturing a secondary battery cell of the present invention, only two monomers participating in compounding are strictly controlled in each step, so that on one hand, the positions of the monomers participating in compounding can be firmly aligned, and after the steps (1) to (3) are completed, the alignment degree of the first diaphragm 2, the second diaphragm 3, the anode 4 and the cathode 1 is very high, thereby effectively solving the problem of lithium precipitation in the prior art; on the other hand, the intermediate product compounded in each step of the method for manufacturing the secondary battery cell does not have the wrinkling phenomenon, and the finally manufactured finished product secondary battery cell has good quality.
Example 2
It can be understood that the method for manufacturing a secondary battery cell of the present invention mainly aims at controlling the number of monomers involved in compounding in each step, and therefore, the present invention is not specifically limited to the specific sequence of steps (1), (2), and (3) in example 1, that is, the sequence of compounding the first separator 2, the second separator 3, the positive electrode 4, and the negative electrode 1 is not strictly limited.
It is easy to understand that the specific form of the positive electrode 4 and the negative electrode 1 is not limited, and the positive electrode 4 and the negative electrode 1 may be selected in the form of a pole piece or a strip.
For example, in this embodiment, the method for manufacturing a secondary battery cell of the present invention includes the steps of:
(1) covering and compounding the first diaphragm 2 on one side of the cathode 1, wherein the distances from two sides of the first diaphragm 2 in the width direction to the corresponding two sides of the cathode 1 are equal;
(2) compounding the positive electrode 4 on the other side of the first diaphragm 2, which is far away from the negative electrode 1, wherein the distances from two sides of the first diaphragm 2 in the width direction to the corresponding two sides of the positive electrode 4 are equal;
(3) covering and compounding a second diaphragm 3 on the other side of the cathode 1, wherein the distances from two sides of the second diaphragm 3 in the width direction to the corresponding two sides of the cathode 1 are equal;
(4) a composite formed by the first separator 2, the negative electrode 1, the second separator 3, and the positive electrode 4 is wound into a secondary battery cell along the extending direction thereof.
It can be seen that, different from embodiment 1, in this embodiment, after the first separator 2 and the negative electrode 1 are combined, the positive electrode 4 is combined on the other side of the first separator 2 away from the negative electrode 1, and then the second separator 3 is covered and combined on the other side of the negative electrode 1, and finally the composite formed by the first separator 2, the negative electrode 1, the second separator 3 and the positive electrode 4 is wound into a secondary battery cell along the extending direction thereof. Since the steps (1), (2) and (3) in this embodiment also follow the principle that only 2 monomers participate in each compounding in embodiment 1, a secondary battery cell with a high alignment degree and no wrinkling phenomenon can be obtained in this embodiment as well.
Similarly, the first separator 2 may be first combined with the positive electrode 4, the negative electrode 1 may be combined with the first separator 2, and the second separator 3 may be finally combined with the other side of the negative electrode 1. Or other sequences may be adopted, and a person skilled in the art may adjust the steps according to actual conditions as long as only two monomers participate in the compounding in each step and the positions of the two monomers are aligned, which is not described in detail herein.
Example 3
In this embodiment, the secondary battery cell manufacturing method of the present invention is based on embodiment 1 or embodiment 2, and preferably sets the widths of the first separator 2 and the second separator 3 to be the same. With this arrangement, the objects to be referred to by the negative electrode 1 and the positive electrode 4 are substantially the same regardless of whether the negative electrode 1 refers to the first separator 2 or the second separator 3 when determining the position, and regardless of whether the positive electrode 4 refers to the first separator 2 or the second separator 3 when determining the position, and the relative positions of the negative electrode 1, the positive electrode 4, the first separator 2, and the second separator 3 can be secured, and the four can have an extremely high degree of alignment.
Example 4
In this embodiment, the secondary battery cell manufacturing method of the present invention is configured as follows on the basis of embodiment 1 or embodiment 2: the first separator is aligned with an end of the second separator in a winding direction. In this way, the first separator 2 and the second separator 3 directly correspond to each other, and the first separator 2, the second separator 3, the positive electrode 4, and the negative electrode 1 can be aligned more easily.
Example 5
In this embodiment, the secondary battery cell manufacturing method of the present invention is configured as follows on the basis of embodiment 1 or embodiment 2: the end of the second separator or the first separator not combined with the positive electrode in the winding direction is 0.5mm to 1mm beyond the end of the first separator or the second separator combined with the positive electrode in the winding direction. For example, as shown in fig. 3 and 4, the end of the second separator 3 combined with the positive electrode 4 in the winding direction is shorter than the end of the first separator 2 not combined with the positive electrode 4 in the winding direction, the distance between the first separator 2 and the end of the second separator 3 is L2, and L2 is set to 0.5mm to 1 mm.
This is because, in the field of secondary battery cell manufacturing, the size of the positive electrode 4 is generally set smaller than that of the negative electrode 1, and the distance from the positive electrode 4 to the edge of the separator to which it is compounded is generally set the same as that from the negative electrode 1 to the edge of the separator to which it is compounded. Therefore, as shown in fig. 4, only by providing the end portion in the winding direction of the second separator 3 combined with the positive electrode 4 shorter than the end portion in the winding direction of the first separator 2 not combined with the positive electrode 4, it is possible to align the positive electrode 4 with the negative electrode 1, thereby further improving the alignment degree and quality of the secondary battery cell.
Example 6
In this embodiment, as shown in fig. 2 to 4, in the method for manufacturing a secondary battery cell according to the present invention, it is preferable that a composite body formed by the first separator 2, the negative electrode 1, the second separator 3, and the positive electrode 4 is wound in a direction toward the negative electrode 1 in addition to embodiment 1 or embodiment 2.
It should be noted that, compared with the positive electrode 4, the negative electrode 1 is relatively easier to fall off powder due to different coating processes and coating materials, and the composite body is wound toward the negative electrode 1, so that the powder falling off from the negative electrode 1 is not easy to contact with the positive electrode 4, cross contamination between the negative electrode 1 and the positive electrode 4 is prevented, and the quality of the secondary battery cell is improved.
Example 7
In this embodiment, the secondary battery cell manufacturing method of the present invention is optimally designed with respect to the dimensional relationship between the first separator 2, the second separator 3, and the negative electrode 1 on the basis of embodiment 1 or embodiment 2. Specifically, as shown in fig. 2, the distance from the edge of the first separator 2 to the corresponding edge of the anode 1 is L, which may be 1.5mm to 3 mm. Similarly, the distance from the edge of the second separator 3 to the corresponding both sides of the negative electrode 1 is also 1.5mm to 3 mm. With the adoption of the arrangement, the secondary battery cell manufactured by the method for manufacturing the secondary battery cell can simultaneously meet the design capacity requirement, the internal resistance requirement and the safety requirement, and the quality of the secondary battery cell is comprehensively improved.
Example 8
In order to firmly compound the positive electrode and the negative electrode with the first diaphragm and the second diaphragm in each compounding step in the method for manufacturing the secondary battery cell, it is preferable that, on the basis of embodiment 1 or embodiment 2, when the first diaphragm and the negative electrode are compounded, the compounding pressure is not more than 6 tons, the temperature of a hot-press roller is controlled to be 75-100 ℃, and the gap between the rollers is 20 μm-30 μm. Similarly, when the second diaphragm is compounded with the negative electrode, the compounding pressure is controlled to be 2 tons to 4 tons, the temperature of a hot-pressing roller is controlled to be 50 ℃ to 75 ℃, and the gap between the rollers is 20 mu m to 30 mu m. Similarly, when the anode is compounded with the first diaphragm or the second diaphragm, the compounding pressure is less than or equal to 6 tons, the temperature of the hot-pressing roller is controlled to be 75-100 ℃, and the gap between the rollers is 20-50 μm. So set up, can improve the first diaphragm, second diaphragm, negative pole, anodal rate of connection each other, joint strength and the homogeneity of laminating degree in addition, help improving the quality of secondary battery electricity core.
Example 9
In this embodiment, the method for manufacturing a secondary battery cell of the present invention further includes, on the basis of embodiment 1 or embodiment 2, the steps of: and a third diaphragm is coated outside the secondary battery core. Through at secondary battery electricity core external part or totally cladding third diaphragm, can improve secondary battery electricity core's security, for example, the cladding of third diaphragm to secondary battery electricity core for secondary battery electricity core's structural strength obtains improving, effectively reduces the influence that receives when secondary battery electricity core bumps, and because third diaphragm itself has the anti-puncture performance of certain degree, thereby can reduce the foreign matter and pierce through the pole piece and lead to secondary battery electricity core to take place the possibility of short circuit.
Example 10
In this embodiment, the invention discloses a secondary battery cell, which is manufactured by the method for manufacturing the secondary battery cell according to any one of the embodiments. Since the specific steps, the attention points, the technical principles and the functional effects of the method for manufacturing the secondary battery cell have been described in detail in the foregoing embodiments, any technical content related to the method for manufacturing the secondary battery cell can refer to the foregoing embodiments, and the detailed description of the invention is not repeated herein. Compared with the secondary battery cell in the prior art, the secondary battery cell has higher alignment degree and better quality.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method for manufacturing a secondary battery cell is characterized by comprising the following steps:
covering and compounding a first diaphragm on one side of the negative electrode, wherein the distances from two sides of the first diaphragm in the width direction to the corresponding two sides of the negative electrode are equal;
covering and compounding a second diaphragm on the other side of the negative electrode, wherein the distances from two sides of the second diaphragm in the width direction to the corresponding two sides of the negative electrode are equal;
compounding a positive electrode on the other side of the first diaphragm or the second diaphragm, which is away from the negative electrode, wherein the distances from two sides of the first diaphragm or the second diaphragm in the width direction to the corresponding two sides of the positive electrode are equal;
and winding a complex formed by the first diaphragm, the negative electrode, the second diaphragm and the positive electrode into a secondary battery cell along the extending direction of the complex.
2. The method for manufacturing a secondary battery cell according to claim 1, wherein the width of the first separator is the same as the width of the second separator.
3. The method of manufacturing a secondary battery cell of claim 1, wherein the first separator is aligned with an end of the second separator in a winding direction.
4. The method for manufacturing the secondary battery cell of claim 1, wherein no end of the second separator or the first separator that is combined with the positive electrode in the winding direction exceeds an end of the first separator or the second separator that is combined with the positive electrode in the winding direction.
5. The method of manufacturing a secondary battery cell of claim 4, wherein the excess distance is 0.5mm to 1 mm.
6. The method for manufacturing a secondary battery cell according to claim 1, wherein the composite is wound in a direction toward the negative electrode side.
7. The method for manufacturing a secondary battery cell of claim 1, wherein the distance from the edge of the first separator to the corresponding edge of the negative electrode is 1.5mm to 3mm, and the distance from the edge of the second separator to the corresponding edge of the negative electrode is 1.5mm to 3 mm.
8. The method for manufacturing the secondary battery cell of claim 1, wherein when the first diaphragm is compounded with the negative electrode, the compounding pressure is less than or equal to 6 tons, the temperature of a hot-press roller is controlled to be 75-100 ℃, and the gap between the rollers is 20-30 μm;
when the second diaphragm is compounded with the negative electrode, the compounding pressure is 2 tons to 4 tons, the temperature of a hot-pressing roller is controlled to be 50 ℃ to 75 ℃, and the gap between the rollers is 20 mu m to 30 mu m;
when the anode is compounded with the first diaphragm or the second diaphragm, the compounding pressure is less than or equal to 6 tons, the temperature of the hot-pressing roller is controlled to be 75-100 ℃, and the gap between the rollers is 20-50 mu m.
9. The method for manufacturing a secondary battery cell according to claim 1, further comprising: and a third diaphragm is coated outside the secondary battery core.
10. A secondary battery cell, characterized by being produced by the secondary battery cell production method according to any one of claims 1 to 9.
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2645251Y (en) * | 2003-09-28 | 2004-09-29 | 惠州Tcl金能电池有限公司 | Coiled lithium battery electric core |
| CN1770538A (en) * | 2005-04-11 | 2006-05-10 | 深圳市比克电池有限公司 | Method for making winding type lithium ion battery battery core, battery and battery core and battery |
| CN105870513A (en) * | 2016-06-06 | 2016-08-17 | 肇庆市风华锂电池有限公司 | Method and device for improving covering degree of lithium ion battery wound core |
| CN106099206A (en) * | 2016-07-24 | 2016-11-09 | 天津滨海新区景福电子科技有限公司 | A kind of lithium cell electric core of coiled |
| CN107528014A (en) * | 2017-08-23 | 2017-12-29 | 深圳市比克动力电池有限公司 | Electrical core of power battery, the lithium battery comprising the battery core and lithium battery preparation method |
| CN206849962U (en) * | 2017-03-08 | 2018-01-05 | 江西迪比科股份有限公司 | A kind of high security self-heating polymer lithium ion secondary battery |
| CN110034337A (en) * | 2019-03-25 | 2019-07-19 | 合肥国轩高科动力能源有限公司 | Method for compounding lithium ion battery pole piece and diaphragm and application of lithium ion battery pole piece and diaphragm in battery preparation |
| CN110911762A (en) * | 2019-10-30 | 2020-03-24 | 郑州比克电池有限公司 | Method for preventing winding wrinkles of lithium battery cell |
| CN113131088A (en) * | 2019-12-30 | 2021-07-16 | 荣盛盟固利新能源科技有限公司 | Lithium ion soft package battery |
| CN113594532A (en) * | 2021-08-03 | 2021-11-02 | 蜂巢能源科技有限公司 | Battery cell, preparation method and system thereof, and secondary battery |
-
2022
- 2022-03-21 CN CN202210275384.2A patent/CN114614076A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2645251Y (en) * | 2003-09-28 | 2004-09-29 | 惠州Tcl金能电池有限公司 | Coiled lithium battery electric core |
| CN1770538A (en) * | 2005-04-11 | 2006-05-10 | 深圳市比克电池有限公司 | Method for making winding type lithium ion battery battery core, battery and battery core and battery |
| CN105870513A (en) * | 2016-06-06 | 2016-08-17 | 肇庆市风华锂电池有限公司 | Method and device for improving covering degree of lithium ion battery wound core |
| CN106099206A (en) * | 2016-07-24 | 2016-11-09 | 天津滨海新区景福电子科技有限公司 | A kind of lithium cell electric core of coiled |
| CN206849962U (en) * | 2017-03-08 | 2018-01-05 | 江西迪比科股份有限公司 | A kind of high security self-heating polymer lithium ion secondary battery |
| CN107528014A (en) * | 2017-08-23 | 2017-12-29 | 深圳市比克动力电池有限公司 | Electrical core of power battery, the lithium battery comprising the battery core and lithium battery preparation method |
| CN110034337A (en) * | 2019-03-25 | 2019-07-19 | 合肥国轩高科动力能源有限公司 | Method for compounding lithium ion battery pole piece and diaphragm and application of lithium ion battery pole piece and diaphragm in battery preparation |
| CN110911762A (en) * | 2019-10-30 | 2020-03-24 | 郑州比克电池有限公司 | Method for preventing winding wrinkles of lithium battery cell |
| CN113131088A (en) * | 2019-12-30 | 2021-07-16 | 荣盛盟固利新能源科技有限公司 | Lithium ion soft package battery |
| CN113594532A (en) * | 2021-08-03 | 2021-11-02 | 蜂巢能源科技有限公司 | Battery cell, preparation method and system thereof, and secondary battery |
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