CN111653832B - Laminated cell manufacturing control method, laminated cell and lithium battery - Google Patents
Laminated cell manufacturing control method, laminated cell and lithium battery Download PDFInfo
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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
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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
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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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
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- H01M4/02—Electrodes composed of, or comprising, active material
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- 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
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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
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Abstract
The embodiment of the invention provides a laminated battery cell manufacturing control method, a laminated battery cell and a lithium battery, and relates to the technical field of battery manufacturing. The manufacturing method of the laminated cell comprises the steps of controlling the width precision of the first pole piece to be within the first precision +/-A1; controlling the width precision of the second pole piece to be the first precision +/-A1; controlling the precision of the distance delta 1 between two adjacent first pole pieces to be the second precision +/-A2; controlling the precision of the distance delta 2 between the end part of the first pole piece and the end part of the second pole piece to be third precision +/-A3; the laminated battery cell meets the preset alignment requirement by controlling the first precision +/-A1, the second precision +/-A2 and the third precision +/-A3. The method can ensure the alignment degree of the laminated battery cell, thereby improving the yield of battery cell manufacture.
Description
Technical Field
The invention relates to the technical field of battery manufacturing, in particular to a laminated battery cell manufacturing control method, a laminated battery cell and a lithium battery.
Background
The composite lamination belongs to one of laminated battery core manufacturing processes, and a folding type composite lamination process is developed in order to improve the lamination efficiency. However, the folding composite laminate process has the following problems:
in the manufacturing process of the folding composite laminated battery core, the gap exists between the first pole pieces, and the gap is connected by the flexible diaphragm. When the composite unit is folded, the position of the bending point of the diaphragm cannot be accurately controlled, so that the alignment degree of the whole battery cell is changed. If the alignment degree is poor, the quality of the battery cell product is reduced; when the first pole piece can not completely cover the second pole piece, a laminated battery cell which does not meet the product quality requirement is generated.
Disclosure of Invention
The invention aims to provide a laminated battery cell manufacturing control method, a laminated battery cell and a lithium battery, which can improve the alignment degree of the laminated battery cell, thereby improving the manufacturing yield of the battery cell and the overall quality of a product.
Embodiments of the invention may be implemented as follows:
in a first aspect, an embodiment of the present invention provides a laminated battery cell manufacturing control method, including:
controlling the width precision of the first pole piece to be within +/-A1 of the first precision;
controlling the width precision of the second pole piece to be the first precision +/-A1;
controlling the precision of the distance delta 1 between every two adjacent first pole pieces to be within +/-A2 of a second precision;
controlling the precision of the distance delta 2 between the end part of the first pole piece and the end part of the second pole piece to be third precision +/-A3;
and controlling the first precision +/-A1, the second precision +/-A2 and the third precision +/-A3 to ensure that the laminated battery cell after lamination meets the preset alignment degree.
In an optional embodiment, the step of controlling the first precision ± a1, the second precision ± a2, and the third precision ± A3 to ensure that the laminated cell after lamination meets a preset alignment degree includes:
controlling the thickness of the first pole piece to be Ta, controlling the thickness of the second pole piece to be Tc, and controlling the thickness of the diaphragm to be Ts;
calculating a minimum value delta 1x of a distance delta 1 between two adjacent first pole pieces:
δ1x＝4Ts+2Ta+Tc；
calculating the maximum value delta 1s of the distance delta 1 between two adjacent first pole pieces:
δ1s＝δ1x+2A2。
in an alternative embodiment, the step of calculating the maximum value δ 1s of the distance δ 1 between two adjacent first pole pieces includes:
in the stacking direction after lamination, the limit offset distance between the end part of the first pole piece of the upper layer and the end part of the first pole piece of the adjacent lower layer is O;
the length of the diaphragm is L under the condition of the limit offset distance; then:
L＝δ1s-(3Ts+Ta)；
L2＝O2+(Ts+Ta+Tc)2。
in an alternative embodiment, the step of controlling the width of the first pole piece to a first accuracy ± a1 includes:
controlling the cut width W1 of the first pole piece.
In an alternative embodiment, the step of controlling the width of the second pole piece to the first precision ± a1 includes:
controlling the cut width W2 of the second pole piece.
In a second aspect, an embodiment of the present invention provides a laminated battery cell, including a first pole piece, a second pole piece, a first diaphragm, and a second diaphragm; before lamination, the first pole pieces are arranged between the first diaphragm and the second diaphragm at equal intervals, and one of the two adjacent second pole pieces is arranged on one side of the first diaphragm, which is far away from the first pole piece, and the other second pole piece is arranged on one side of the second diaphragm, which is far away from the first pole piece; the second pole piece and the first pole piece are arranged in a stacked mode;
the width precision of the first pole piece is a first precision +/-A1; the width precision of the second pole piece is a first precision +/-A1; the distance between every two adjacent first pole pieces is delta 1, and the precision of the distance delta 1 is a second precision +/-A2; the precision of the distance delta 2 between the end part of the first pole piece and the end part of the second pole piece is third precision +/-A3, so that the laminated battery cell after lamination meets the preset alignment degree.
In an alternative embodiment, the first pole piece is an anode, i.e. a negative electrode, and the second pole piece is a cathode, i.e. a positive electrode;
or, the first pole piece is a cathode, namely a positive pole, and the second pole piece is an anode, namely a negative pole.
In an alternative embodiment, the thickness of the first pole piece is Ta, the thickness of the second pole piece is Tc, and the thicknesses of the first diaphragm and the second diaphragm are Ts respectively;
the minimum value of the distance delta 1 between two adjacent first pole pieces is delta 1 x:
δ1x＝4Ts+2Ta+Tc；
the maximum value of the distance delta 1 between two adjacent first pole pieces is delta 1 s:
δ1s＝δ1x+2A2。
in an alternative embodiment, after lamination, in the lamination direction, the limit offset distance between the end of the first pole piece in the upper layer and the end of the first pole piece in the adjacent lower layer is O; the length of the diaphragm is L under the condition of the limit offset distance; then:
L＝δ1s-(3Ts+Ta)；
L2＝O2+(Ts+Ta+Tc)2。
in a third aspect, an embodiment of the present invention provides a lithium battery including the laminated cell described in any one of the foregoing embodiments. The laminated battery cell comprises a first pole piece, a second pole piece, a first diaphragm and a second diaphragm; before lamination, the first pole piece is arranged between the first diaphragm and the second diaphragm at equal intervals, the second pole piece and the first pole piece are arranged in a laminated mode, and the first diaphragm or the second diaphragm is arranged between the second pole piece and the first pole piece at intervals;
the width precision of the first pole piece is a first precision +/-A1; the width precision of the second pole piece is a first precision +/-A1; the distance between every two adjacent first pole pieces is delta 1, and the precision of the distance delta 1 is a second precision +/-A2; the precision of the distance delta 2 between the end part of the first pole piece and the end part of the second pole piece is third precision +/-A3, so that the laminated battery cell meets the preset alignment degree.
The laminated battery cell manufacturing control method, the laminated battery cell and the lithium battery provided by the embodiment of the invention have the beneficial effects that:
according to the laminated cell manufacturing control method provided by the embodiment of the invention, the first precision +/-A1 of the width of the first pole piece, the first precision +/-A1 of the width of the second pole piece, the second precision +/-A2 of the distance delta 1 between two adjacent first pole pieces and the third precision +/-A3 of the distance between the end part of the first pole piece and the end part of the second pole piece are controlled, so that the alignment degree of two adjacent first pole pieces meets the requirement in the laminating direction after lamination, the alignment degree of two adjacent second pole pieces meets the requirement, the first pole pieces are ensured to completely cover the second pole pieces, the yield of the laminated cell manufacturing process is improved, and the quality of the laminated cell is improved.
The laminated battery cell is laminated by adopting the laminated battery cell manufacturing control method, so that the accurate control of the distance delta 1 between two adjacent first pole pieces can be ensured, the alignment degree of the two adjacent first pole pieces and the alignment degree of the two adjacent second pole pieces are improved in the laminating direction after lamination, a qualified laminated battery cell meeting the requirement of the alignment degree is manufactured, the yield of the laminated battery cell manufacturing process is further improved, and the quality of the laminated battery cell is improved.
The lithium battery provided by the embodiment of the invention comprises the laminated battery cell, and the laminated battery cell has high alignment degree and good quality, so that the quality of a lithium battery product is favorably improved, and the product yield is high.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a laminated cell according to an embodiment of the present invention before being folded;
fig. 2 is another schematic structural diagram of a laminated cell provided in an embodiment of the present invention before being folded;
fig. 3 is a schematic structural diagram of an optimal state after a laminated battery cell is folded according to a specific embodiment of the present invention;
FIG. 4 is a partial view at B of FIG. 3;
fig. 5 is a schematic structural diagram of a limit deviation state after a laminated battery cell is folded according to a specific embodiment of the present invention;
fig. 6 is a partial view at C in fig. 5.
Icon: 110-a first pole piece; 120-a second pole piece; 130-a membrane; 131-a first membrane; 133-second diaphragm.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or a positional relationship based on that shown in the drawings or that the product of the present invention is used as it is, this is only for convenience of description and simplification of the description, and it does not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
In the existing manufacturing process of the folding composite laminated battery core, gaps exist among a plurality of first pole pieces, and the gaps are connected through flexible diaphragms. When the composite unit is folded, the position of the bending point of the diaphragm cannot be accurately controlled, so that the alignment degree of the whole battery cell is changed. If the alignment degree can not meet the requirement, or the first pole piece can not completely cover the second pole piece, a laminated battery cell which does not meet the product quality requirement is generated.
In order to overcome the defects in the prior art, the application provides a laminated cell manufacturing control method, which can improve the alignment degree of a laminated cell after lamination, improve the yield of laminated cell product manufacturing, and improve the quality of the laminated cell product.
Fig. 1 is a schematic structural diagram of a laminated cell according to an embodiment of the present invention before being folded, please refer to fig. 1.
The embodiment of the invention provides a laminated battery cell and a manufacturing control method thereof, wherein the laminated battery cell comprises a first pole piece 110, a second pole piece 120, a first diaphragm 131 and a second diaphragm 133. Before lamination, the first pole piece 110 is arranged between the first diaphragm 131 and the second diaphragm 133 at equal intervals, the second pole piece 120 is arranged on the first pole piece 110 in a stacking mode, and the first diaphragm 131 or the second diaphragm 133 is arranged between the second pole piece 120 and the first pole piece 110 in an interval mode. Optionally, before lamination, one of the two adjacent second pole pieces 120 is disposed on the side of the first diaphragm 131 away from the first pole piece 110, and the other second pole piece 120 is disposed on the side of the second diaphragm 133 away from the first pole piece 110. Wherein, the first pole piece 110 and the second pole piece 120 are respectively an anode and a cathode; in this embodiment, as shown in fig. 1, the first pole piece 110 is an anode, i.e., a negative electrode, and the second pole piece 120 is a cathode, i.e., a positive electrode.
Alternatively, in other alternative embodiments, as shown in fig. 2, the first pole piece 110 is a cathode, i.e., a positive pole; the second plate 120 is an anode, i.e., a negative electrode; the second pole piece 120 is disposed between the first diaphragm 131 and the second diaphragm 133 at equal intervals, and the first pole piece 110 is disposed outside the two diaphragms 130 at equal intervals and staggered up and down, as long as one of the first pole piece 110 and the second pole piece 120 is a positive pole and the other is a negative pole, which is not limited specifically herein.
In this embodiment, the width of the first pole piece 110 is W1, the width of the second pole piece 120 is W2, and the width of the first pole piece 110 is greater than the width of the second pole piece 120, so that the first pole piece 110 completely covers the second pole piece 120, that is, the orthographic projection of the second pole piece 120 on the first pole piece 110 is completely on the first pole piece 110. Optionally, the precision of the width W1 of the first pole piece 110 is a first precision ± a 1; the width W2 of the second pole piece 120 has a first precision ± a 1; the distance between two adjacent first pole pieces 110 is delta 1, and the precision of the distance delta 1 is the second precision +/-A2; the precision of the distance δ 2 between the end of the first pole piece 110 and the end of the second pole piece 120 is a third precision ± a3, so that the laminated battery cell meets the preset alignment requirement. The alignment degree refers to the degree of alignment of the end portions of two adjacent first pole pieces 110, i.e., the distance between the end portion of the first pole piece 110 in the previous layer and the end portion of the first pole piece 110 in the next layer, and the degree of alignment of the end portions of two adjacent second pole pieces 120, i.e., the distance between the end portion of the second pole piece 120 in the previous layer and the end portion of the second pole piece 120 in the next layer, in the stacking direction, i.e., the vertical direction, after the plurality of first pole pieces 110 and the plurality of second pole pieces 120 are folded. The most ideal situation after folding is that the distance between the end of the first pole piece 110 of the previous layer and the end of the first pole piece 110 of the next layer adjacent to the previous layer is zero, the distance between the end of the second pole piece 120 of the previous layer and the end of the second pole piece 120 of the next layer adjacent to the previous layer is zero, the first pole piece 110 completely covers the second pole piece 120, the distances from the two ends of the second pole piece 120 to the two ends of the first pole piece 110 are equal, i.e. the center of the second pole piece 120 coincides with the center of the first pole piece 110.
Fig. 3 is a schematic structural diagram of a folded laminated battery cell according to an embodiment of the present invention, and fig. 4 is a partial view of a portion B in fig. 3; fig. 5 is a schematic structural diagram of a folded laminated cell in a limit deviation state according to an embodiment of the present invention, and fig. 6 is a partial view of a position C in fig. 5; please refer to fig. 3 to 6.
In detail, the method for controlling the manufacturing of the laminated battery cell provided by the embodiment of the invention specifically comprises the following steps:
controlling the precision of the width W1 of the first pole piece 110 to be a first precision +/-A1; the accuracy of controlling the width W2 of the second pole piece 120 is the first accuracy ± a 1. Alternatively, the first precision ± a1 can be controlled by controlling the cutting precision of the first pole piece 110 and the second pole piece 120, and during the manufacturing process, the cutting width of the first pole piece 110 is W1, and the cutting precision is controlled to be ± a 1. The cutting width of the second pole piece 120 is W2, and the cutting precision is controlled to be +/-A1.
Controlling the precision of the distance delta 1 between two adjacent first pole pieces 110 to be a second precision +/-A2, and controlling the precision of the distance delta 2 between the end parts of the first pole pieces 110 and the second pole pieces 120 to be a third precision +/-A3; through controlling the first precision +/-A1, the second precision +/-A2 and the third precision +/-A3, the laminated battery cell after lamination meets the preset alignment requirement, and the quality of the laminated battery cell is improved.
Further, the thickness of the first pole piece 110 is controlled to be Ta, the thickness of the second pole piece 120 is controlled to be Tc, the thickness of the diaphragm 130 is controlled to be Ts, and the first diaphragm 131 and the second diaphragm 133 are made of the same material and have the same thickness, which are Ts respectively; then the minimum value δ 1x of the distance δ 1 between two adjacent first pole pieces 110 and the maximum value δ 1s of the distance δ 1 between two adjacent first pole pieces 110 can be calculated:
δ1x＝4Ts+2Ta+Tc；
δ1s＝δ1x+2A2。
it can be understood that when the distance δ 1 between two adjacent first pole pieces 110 is the minimum value δ 1x, it indicates that the end portions of two adjacent first pole pieces 110 are completely aligned, and at this time, the minimum distance δ 1x is the sum of the thicknesses 2Ts of two first diaphragms 131, 2Ts of two second diaphragms 133, 2Ta of two first pole pieces 110 and the thickness Tc of one second pole piece 120 after folding, that is, δ 1x is 4Ts +2Ta + Tc.
When the distance δ 1 between two adjacent first pole pieces 110 is the maximum value δ 1s, it is indicated that the maximum up deviation and the maximum down deviation distance are increased on the basis of the minimum distance δ 1x, that is, twice the second precision a2, and the second precision a2 indicates the precision of the distance δ 1 between two adjacent first pole pieces 110, so that δ 1s is δ 1x +2a 2.
Optionally, when the distance δ 1 between two adjacent first pole pieces 110 is the maximum value δ 1s, that is, there is an offset distance between the ends of two adjacent first pole pieces 110 after lamination, in the lamination direction, that is, the direction perpendicular to the diaphragm 130, if the limit offset distance between the end of the first pole piece 110 on the upper layer and the end of the first pole piece 110 on the adjacent lower layer is O; and in the case of the extreme offset distance, the length of the diaphragm 130 is L; then:
L＝δ1s-(3Ts+Ta)；
L2＝O2+(Ts+Ta+Tc)2or written as O2＝L2-(Ts+Ta+Tc)2
The maximum distance δ 1s between two adjacent first pole pieces 110 can be regarded as the length L of the diaphragm 130, the sum of the thicknesses of the three diaphragms 130 (two first diaphragms 131 and one second diaphragm 133) and the thickness of one first pole piece 110, that is, δ 1s ═ L + (3Ts + Ta), and the equation is modified to L ═ δ 1s- (3Ts + Ta). The equation L δ 1s ═ δ 1x +2a2 and δ 1x ═ 4Ts +2Ta + Tc are substituted into the equation δ 1s- (3Ts + Ta), and the result of the reduction is L ═ Ts + Ta + Tc +2a 2.
In addition, as can be seen from fig. 6, the sum of the thicknesses (Ts + Ta + Tc) of one diaphragm 130, one first pole piece 110 and one second pole piece 120, the length L of the diaphragm 130 and the limit offset distance O form three sides of a right triangle, and O can be obtained by using the pythagorean theorem2＝L2-(Ts+Ta+Tc)2。
According to the calculation formula, the alignment degree of the folded battery cell can be met by controlling the limit offset distance O within a preset range. The length L of the diaphragm 130, the thickness Ts of the diaphragm 130, the thickness Ta of the first pole piece 110 and the thickness Tc of the second pole piece 120 determine the ultimate offset distance O; the thickness Ts of the diaphragm 130, the thickness Ta of the first pole piece 110, and the thickness Tc of the second pole piece 120 are determined by the raw materials of production, and can be regarded as fixed values in the lamination process, so that the length L of the diaphragm 130 becomes a key parameter for controlling the limit offset distance O. Through the foregoing analysis, L ═ Ts + Ta + Tc +2a2, that is, the spacing precision a2 between two adjacent first pole pieces 110 is controlled.
To explain with the verification of actual data, optionally, in the production, the thickness Ts of the diaphragm 130 is 14um, the thickness Ta of the first pole piece 110 is 140um, and the thickness Tc of the second pole piece 120 is 150 um; the minimum value δ 1x of the distance δ 1 between two adjacent first pole pieces 110 is calculated to be 4Ts +2Ta + Tc 486um 0.486 mm. Assume that the control level of the existing precision a1 ═ a2 ═ A3 ═ 0.2 mm; the length L of the diaphragm 130 is 0.704 mm; the ultimate offset distance O is (0.704)2-0.3042)1/2＝0.635mm。
The alignment error a1 of two adjacent first pole pieces 110 is O +2a1 is 1.035 mm; the alignment error a2 of two adjacent second pole pieces 120 is a1+ A3 is 1.235 mm; the possibility of error accumulation exists in the whole cell alignment degree, so that the folded laminated cell is related to the first precision +/-A1 and the third precision +/-A3. Therefore, the width accuracy ± a1 of the first pole piece 110, the width accuracy ± a1 of the second pole piece 120, and the distance accuracy ± A3 between the end of the first pole piece 110 and the end of the second pole piece 120 are improved, which is beneficial to reducing the alignment error of the laminated battery cell and improving the alignment of the laminated battery cell. When the first accuracy ± a1 of the width W1 of the first pole piece 110 is ± 0.2mm, and the first accuracy ± a1 of the width W2 of the second pole piece 120 is ± 0.2mm, when the distance δ 1 between two adjacent first pole pieces 110 is greater than 0.809mm, the end of the second pole piece 120 exceeds the end of the first pole piece 110, that is, the first pole piece 110 cannot completely cover the second pole piece 120, and the battery cell stack does not meet the qualified requirement. Therefore, the first accuracy ± a1, the second accuracy ± a2, and the third accuracy ± A3 need to be improved, and the theoretical limit value of the alignment error between the adjacent first pole piece 110 and the adjacent second pole piece 120 is increased, for example, the theoretical limit value of the alignment error between the adjacent first pole piece 110 and the adjacent second pole piece 120 is increased to within 1.2mm, so that the alignment of the folded battery cell can be effectively controlled. In addition, the folding mechanism can be used to control the bending angle of the diaphragm 130 during the folding process, thereby avoiding cumulative errors. Further, can also adopt the mechanism outside the limit in folding process, the degree of accuracy of control diaphragm 130 bending point and the position of restriction first pole piece 110 and second pole piece 120 both sides can effectively control the alignment degree of folding back electric core, promote electric core quality and production yield.
The embodiment of the invention also provides a lithium battery, which adopts the laminated battery cell, and the laminated battery cell adopts the laminated battery cell manufacturing control method, and the alignment degree after the battery cell is folded is improved by controlling the width precision of the first pole piece 110 +/-A1, the width precision of the second pole piece 120 +/-A1, the distance precision between two adjacent first pole pieces 110 +/-A2 and the distance precision between the end part of the first pole piece 110 and the end part of the second pole piece 120 +/-A3, so that the yield of battery cell manufacturing is improved, and the production quality of the battery cell is improved.
In summary, embodiments of the present invention provide a laminated battery cell manufacturing control method, a laminated battery cell, and a lithium battery, which have the following beneficial effects:
according to the method for controlling the laminated battery cell manufacturing, provided by the embodiment of the invention, the reasonable distance delta 1 between two adjacent first pole pieces 110 can be made by controlling the width precision of the first pole piece 110 +/-A1, the width precision of the second pole piece 120 +/-A1, the distance precision of the two adjacent first pole pieces 110 +/-A2 and the distance precision of the end part of the first pole piece 110 +/-A3 and the end part of the second pole piece 120, so that the folded battery cell has good alignment degree, and the quality of the battery cell and the yield in the manufacturing process are improved. In addition, can also further improve the alignment degree of folding back electric core through setting up stop gear when folding and control folding mechanism's folding angle.
According to the laminated battery cell provided by the embodiment of the invention, by adopting the laminated battery cell manufacturing control method, the alignment degree of the folded battery cell can be ensured, and the product manufacturing yield and the battery cell quality are improved.
The lithium battery provided by the embodiment of the invention comprises the laminated battery cell, and the lithium battery has the advantages of high qualification rate, stable and reliable operation and long service life because the laminated battery cell has good alignment degree and good product quality.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (8)
1. A laminated cell manufacturing control method is characterized by comprising the following steps:
controlling the width precision of the first pole piece to be within +/-A1 of the first precision;
controlling the width precision of the second pole piece to be the first precision +/-A1;
controlling the precision of the distance delta 1 between every two adjacent first pole pieces to be within +/-A2 of a second precision;
controlling the precision of the distance delta 2 between the end part of the first pole piece and the end part of the second pole piece to be third precision +/-A3;
controlling the first precision +/-A1, the second precision +/-A2 and the third precision +/-A3 to ensure that the laminated battery cell after lamination meets the preset alignment degree;
the step of controlling the first precision ± a1, the second precision ± a2, and the third precision ± A3 to ensure that the laminated battery cell after lamination meets a preset alignment degree includes:
controlling the thickness of the first pole piece to be Ta, controlling the thickness of the second pole piece to be Tc, and controlling the thickness of the diaphragm to be Ts;
calculating a minimum value delta 1x of a distance delta 1 between two adjacent first pole pieces:
δ1x＝4Ts+2Ta+Tc；
calculating the maximum value delta 1s of the distance delta 1 between two adjacent first pole pieces:
δ1s＝δ1x+2A2。
2. the method for controlling the manufacturing of the laminated battery cell according to claim 1, wherein the step of calculating the maximum value δ 1s of the distance δ 1 between two adjacent first pole pieces comprises:
in the stacking direction after lamination, the limit offset distance between the end part of the first pole piece of the upper layer and the end part of the first pole piece of the adjacent lower layer is O;
the length of the diaphragm is L under the condition of the limit offset distance; then:
L＝δ1s-(3Ts+Ta)；
L2＝O2+(Ts+Ta+Tc)2。
3. the method for controlling the fabrication of the laminated cell according to claim 1, wherein the step of controlling the width of the first pole piece to a first precision ± a1 comprises:
controlling the cut width W1 of the first pole piece.
4. The method for controlling the fabrication of the laminated cell according to claim 1, wherein the step of controlling the width of the second pole piece to a first precision ± a1 comprises:
controlling the cut width W2 of the second pole piece.
5. A laminated cell is characterized by comprising a first pole piece, a second pole piece, a first diaphragm and a second diaphragm; before lamination, the first pole pieces are arranged between the first diaphragm and the second diaphragm at equal intervals, and one of the two adjacent second pole pieces is arranged on one side of the first diaphragm, which is far away from the first pole piece, and the other second pole piece is arranged on one side of the second diaphragm, which is far away from the first pole piece; the second pole piece and the first pole piece are arranged in a stacked mode;
the width precision of the first pole piece is a first precision +/-A1; the width precision of the second pole piece is a first precision +/-A1; the distance between every two adjacent first pole pieces is delta 1, and the precision of the distance delta 1 is a second precision +/-A2; the precision of the distance delta 2 between the end part of the first pole piece and the end part of the second pole piece is a third precision +/-A3, so that the laminated battery cell after lamination meets the preset alignment degree;
the thickness of the first pole piece is Ta, the thickness of the second pole piece is Tc, and the thicknesses of the first diaphragm and the second diaphragm are Ts respectively;
the minimum value of the distance delta 1 between two adjacent first pole pieces is delta 1 x:
δ1x＝4Ts+2Ta+Tc；
the maximum value of the distance delta 1 between two adjacent first pole pieces is delta 1 s:
δ1s＝δ1x+2A2。
6. the laminated cell of claim 5, wherein the first pole piece is an anode, i.e., a negative electrode, and the second pole piece is a cathode, i.e., a positive electrode;
or, the first pole piece is a cathode, namely a positive pole, and the second pole piece is an anode, namely a negative pole.
7. The laminated cell of claim 5, wherein after lamination, in the lamination direction, the ultimate offset distance between the end of the first pole piece in the upper layer and the end of the first pole piece in the adjacent lower layer is O; the length of the diaphragm is L under the condition of the limit offset distance; then:
L＝δ1s-(3Ts+Ta)；
L2＝O2+(Ts+Ta+Tc)2。
8. a lithium battery comprising a laminated cell according to any of claims 5 to 7.
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