CN114006053A - Lithium ion battery assembly process and lithium ion battery - Google Patents
Lithium ion battery assembly process and lithium ion battery Download PDFInfo
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- CN114006053A CN114006053A CN202111270669.9A CN202111270669A CN114006053A CN 114006053 A CN114006053 A CN 114006053A CN 202111270669 A CN202111270669 A CN 202111270669A CN 114006053 A CN114006053 A CN 114006053A
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- lithium ion
- ion battery
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 66
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 60
- 230000008569 process Effects 0.000 title claims abstract description 48
- 238000003466 welding Methods 0.000 claims abstract description 67
- 238000004519 manufacturing process Methods 0.000 claims abstract description 25
- 230000002093 peripheral effect Effects 0.000 claims abstract description 12
- 238000005520 cutting process Methods 0.000 claims abstract description 8
- 239000003292 glue Substances 0.000 claims abstract description 5
- 238000001514 detection method Methods 0.000 claims description 37
- 229910052734 helium Inorganic materials 0.000 claims description 14
- 239000001307 helium Substances 0.000 claims description 14
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 14
- 238000007731 hot pressing Methods 0.000 claims description 12
- 238000003475 lamination Methods 0.000 claims description 10
- 238000010030 laminating Methods 0.000 claims description 7
- 230000002950 deficient Effects 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000004026 adhesive bonding Methods 0.000 description 5
- 238000005452 bending Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
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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
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
-
- 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
-
- 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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
-
- 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
- H01M50/531—Electrode connections inside a battery casing
-
- 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
- H01M50/531—Electrode connections inside a battery casing
- H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
-
- 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
- H01M50/543—Terminals
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery assembly process and a lithium ion battery. The lithium ion battery assembling process comprises the following steps: manufacturing a pole group; prewelding the electrode lugs of the electrode group, and cutting the prewelded electrode lugs; welding and connecting the cut tab with the cover plate; pasting glue at the welding seal position where the lug and the cover plate are welded, and covering the welding seal; encapsulating the outer side of the pole group, and installing the encapsulated pole group into a shell, wherein the open end of the shell is in matched abutting joint with the cover plate; and carrying out peripheral welding on the periphery of the contact between the shell and the cover plate. According to the lithium ion battery assembling process provided by the invention, the steps of connecting sheet welding and core combination in the traditional assembling process are eliminated, so that the product percent of pass is effectively improved, and the assembling procedures are reduced, thereby improving the production efficiency, reducing the product fraction defective, reducing the investment of equipment and energy consumption, and reducing the production cost.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery assembly process and a lithium ion battery.
Background
With the development of the new energy automobile industry, the requirements on power batteries used on new energy automobiles are higher and higher, the energy density of a battery pack can be improved by increasing the capacity of a single battery cell, and for square lithium ion batteries, in order to avoid the difficulty in coating and the aggravation of deformation caused by the increase of the thickness of the battery cell and the length of a pole piece when the capacity of the single battery cell is increased, a method of splitting the single battery cell in an aluminum shell into at least two battery cells and installing the two battery cells in the aluminum shell is generally adopted in the industry. In the prior art, in the production process of a square lithium ion battery, the procedures in the assembly process generally comprise the procedures of lamination, hot pressing, X-ray (X-ray) detection, lug prewelding, lug cutting, connecting sheet welding, connecting sheet and cover plate welding, shell entering, peripheral welding and the like.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defects of various working procedures and complex operation in the lithium ion battery assembling process in the prior art, so that the lithium ion battery assembling process which reduces the working procedures in the assembling process and is simple to operate is provided.
The invention aims to solve another technical problem of overcoming the defect of high reject ratio of lithium ion battery products in the prior art, thereby providing the lithium ion battery with low reject ratio of products.
In order to solve the technical problem, the invention provides a lithium ion battery assembly process, which comprises the following steps:
manufacturing a pole group;
prewelding the electrode lugs of the electrode group, and cutting the prewelded electrode lugs;
welding and connecting the cut tab with the cover plate;
pasting glue at the welding seal position where the lug and the cover plate are welded, and covering the welding seal;
encapsulating the outer side of the pole group, and installing the encapsulated pole group into a shell, wherein the open end of the shell is in matched abutting joint with the cover plate;
and carrying out peripheral welding on the periphery of the contact between the shell and the cover plate.
Optionally, the manufacturing of the pole group includes:
laminating the negative plate, the diaphragm and the positive plate according to a preset sequence;
and carrying out hot pressing on the assembly formed after lamination to form the pole group.
Optionally, the manufacturing of the pole group further includes:
and carrying out hot pressing on the assembly formed after lamination to form a pole group, carrying out X-ray detection on the pole group, entering the next process for the pole group qualified in detection, and carrying out rework or scrapping on the pole group unqualified in detection.
Optionally, the stacking according to the predetermined sequence includes stacking the negative electrode plate, the diaphragm, the positive electrode plate and the diaphragm in a circulating manner in sequence, and the number of circulating times N is greater than or equal to 1.
Optionally, after the peripheral welding is performed on the periphery where the shell and the cover plate are abutted, the method further includes:
and helium detection, wherein the helium detection comprises the steps of carrying out short circuit detection on the battery subjected to peripheral welding by adopting helium detection equipment, marking the battery qualified through detection as a qualified battery, and carrying out rework or scrapping on the battery unqualified through detection.
The lithium ion battery provided by the invention is manufactured by the lithium ion battery assembling process.
Optionally, the lithium ion battery includes:
a housing, one end of which is open;
the pole group is placed in the shell and provided with a positive pole lug and a negative pole lug;
the cover plate is fixedly connected with the opening end of the shell, and one side of the cover plate, which faces the inside of the shell, is fixedly connected with the pole lug of the pole group.
Optionally, the cover plate is configured with a first connection portion and a second connection portion, the first connection portion is adapted to be connected with the positive tab, and the second connection portion is adapted to be connected with the negative tab.
Optionally, the extending direction of the first connecting portion and the second connecting portion is the same as the extending direction of the positive tab and the negative tab of the electrode group, and the extending direction of the first connecting portion and the second connecting portion is perpendicular to the plane where the cover plate is located.
Optionally, the first connection portion is adapted to be connected to the positive tab in a welding manner, and the second connection portion is adapted to be connected to the negative tab in a welding manner.
The technical scheme of the invention has the following advantages:
1. the lithium ion battery assembly process provided by the invention completes the assembly of the lithium ion battery by arranging the working procedures of manufacturing a pole group, prewelding and cutting a pole lug, welding the pole lug and a cover plate, gluing, encapsulating, entering a shell and welding the periphery, and compared with the traditional lithium ion battery production process, the process directly welds the pole lug and the cover plate, thereby canceling the step of welding a connecting sheet in the traditional process, avoiding unqualified products generated in the welding process of the connecting sheet, effectively reducing the defective rate of production, in addition, directly welding the pole lug and the cover plate, realizing that the pole group is directly fixed in the direction vertical to the plane of the cover plate, being convenient for putting the pole group into a shell, reducing the step of core combination compared with the traditional lithium ion battery production process, avoiding the pole lug damage caused by bending when the pole group is overturned and combined in the core combination process, the turnover action of the pole group in the assembly process is reduced, so that the damage to the pole group is reduced, the yield of products is effectively improved, the assembly procedures are reduced by canceling the welding of connecting sheets and canceling a new assembly mode of core combination, the production efficiency is improved, the reject ratio of production is reduced, the investment of equipment and energy consumption is reduced, and the production cost is reduced.
2. According to the assembly process of the lithium ion battery, the negative plate, the diaphragm and the positive plate are laminated according to the preset sequence, the assembly formed after lamination is subjected to hot pressing, the diaphragm is enabled to be more attached to the negative plate and the positive plate, the problems of displacement and the like between the diaphragm and the pole pieces are avoided, the X-ray detection is carried out on the pole group subjected to hot pressing, whether the pole pieces in the pole group are aligned or not and whether damage exists or not is achieved, the pole groups which are not aligned or damaged and unqualified are detected, rework or scrapping is carried out on the unqualified pole groups, and the pole groups which are qualified in detection enter the next working procedure.
3. According to the assembly process of the lithium ion battery, the helium test is further included after the circumference of the abutting edge of the shell and the cover plate is welded, the helium test is adopted to carry out short circuit test on the battery, the battery qualified in the test is marked as a qualified battery, and the unqualified battery in the test is reworked or scrapped, so that the unqualified battery with the short circuit problem is screened out, and the safety of the battery is improved.
4. The lithium ion battery provided by the invention is manufactured by using the lithium ion battery assembly process, compared with the traditional lithium ion battery, the lithium ion battery has the advantages that the connecting sheet in the structure is eliminated, and the number of connecting parts is reduced, so that the condition that the parts are not connected with each other is reduced, and the reject ratio of the lithium ion battery is reduced.
5. According to the lithium ion battery provided by the invention, the cover plate is provided with the first connecting part and the second connecting part, the first connecting part is connected with the positive lug, the second connecting part is connected with the negative lug, so that the connection between the cover plate and the pole group is realized, in addition, the extending directions of the first connecting part and the second connecting part are the same as the extending directions of the positive lug and the negative lug, and the extending directions of the first connecting part and the second connecting part are vertical to the plane of the cover plate, so that when the pole group is connected with the connecting part of the cover plate through the lug, the pole group is vertical to the plane of the cover plate, the lithium ion battery is suitable for being directly installed in the shell, the structure is simple, and the operation is convenient.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow diagram of a lithium ion battery assembly process prior to modification;
FIG. 2 is an assembly view of a modified front pole set and connecting tabs;
FIG. 3 is a top view of FIG. 2;
FIG. 4 is an assembly view of the modified back pole set and cover plate;
FIG. 5 is a top view of FIG. 4;
FIG. 6 is a flow chart of a modified lithium ion battery assembly process;
FIG. 7 is an assembly view of the modified back pole set and cover plate;
fig. 8 is a side view in the direction a of fig. 7.
Description of reference numerals:
1. a pole group; 11. a positive tab; 12. a negative tab; 2. a cover plate; 21. a first connection portion; 22. a second connecting portion; 3. a positive electrode connecting sheet; 31. welding and printing a first positive electrode; 32. welding and printing a second positive electrode; 4. a negative electrode connecting sheet; 41. welding and printing a first negative electrode; 42. and welding and printing the second negative electrode.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present 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.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. 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 addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example one
With reference to fig. 1 to 8, the assembly process of the lithium ion battery provided in this embodiment includes:
manufacturing a pole group 1;
prewelding the electrode lugs of the electrode group 1, and cutting the prewelded electrode lugs;
welding the cut tab with the cover plate 2;
pasting glue at the welding seal position where the lug is welded with the cover plate 2 to cover the welding seal;
encapsulating the outer side of the pole group 1, and installing the encapsulated pole group 1 into a shell, wherein the open end of the shell is in matched abutting joint with the cover plate 2;
the periphery of the case in contact with the cover plate 2 is subjected to peripheral welding.
Optionally, the number of pole groups 1 shown is at least 2, preferably 2.
It should be noted that the embodiment is applicable to a square-shell battery and other lithium ion batteries using a connecting sheet welding assembly process in the conventional assembly process.
The tabs of the electrode group 1 include positive tabs and negative tabs, and the pre-welding of the tabs of the electrode group 1 refers to respectively welding the positive tabs on the plurality of positive plates of the electrode group 1 to integrate the positive tabs on the plurality of positive plates, and welding the negative tabs on the plurality of negative plates of the electrode group 1 to integrate the negative tabs on the plurality of negative plates; the pre-welding comprises laser welding; the welding seal position where the lug is welded with the cover plate 2 is pasted with glue, covers the welding seal, is suitable for protecting the welding seal, and is prevented from being oxidized; the outside of the pole group 1 is encapsulated, and the pole group is suitable for preventing the pole group from being in direct contact with the shell and protecting the pole group.
With reference to fig. 1-5, the conventional lithium ion battery assembly process includes the steps of lamination, hot pressing, X-ray detection, tab pre-welding and tab cutting, connecting sheet welding, gluing, connecting sheet and cover sheet welding, gluing and core combining, gluing and casing, peripheral welding, and helium detection. In the assembling process, two shown pole groups 1 are connected with a connecting sheet, a positive pole lug of each shown pole group 1 is connected with a positive pole connecting sheet 3, a negative pole lug of each shown pole group 1 is connected with a negative pole connecting sheet 4 in a welding mode, a first positive pole welding mark 31 is formed at the joint of the positive pole lug and the positive pole connecting sheet 3, a first negative pole welding mark 41 is formed at the joint of the negative pole lug and the negative pole connecting sheet 4, the extending direction of the connecting sheet is the same as the extending direction of the pole lugs of the two pole groups 1, then the connecting sheet is welded with a cover plate 2, the plane of the cover plate is parallel to the plane of the connecting sheet, a second positive pole welding mark 32 is formed at the joint of the positive pole connecting sheet 3 and the cover plate 2, a second negative pole welding mark 42 is formed at the joint of the negative pole group 4 and the cover plate 2, and then core assembly is carried out according to the core assembly direction shown in figure 3 or figure 5, and bending the polar lugs of the polar groups 1 to enable the two polar groups 1 to be respectively folded by 90 degrees so as to be convenient for assembling the polar groups into the shell, and enabling the cover plate 2 to be abutted with the open end of the shell, thereby forming a closed square battery.
The lithium ion battery assembly process provided by the embodiment completes the assembly of the lithium ion battery by arranging the processes of manufacturing the pole group 1, prewelding and cutting the pole lugs, welding the pole lugs and the cover plate, gluing, encapsulating, entering the shell and welding the periphery, and compared with the traditional lithium ion battery production process, the process directly welds the pole lugs and the cover plate, thereby canceling the step of welding the connecting plates in the traditional process, avoiding unqualified products generated in the welding process of the connecting plates, effectively reducing the defective rate of production, in addition, directly welding the pole lugs and the cover plate 2, realizing that the pole group 1 is directly fixed in the direction vertical to the plane of the cover plate 2, being convenient for assembling the pole group 1 into the shell, compared with the traditional lithium ion battery production process, reducing the step of assembling the core, avoiding the pole lugs from being damaged due to bending of the pole lugs in the core assembling process, the yield of the product is effectively improved, and the assembly procedures are reduced by canceling the welding of the connecting sheets and the new assembly mode of the combined core, so that the production efficiency is improved, the reject ratio of the production is reduced, the investment of equipment and energy consumption is reduced, and the production cost is reduced.
Specifically, the manufacturing of the pole group 1 includes:
laminating the negative plate, the diaphragm and the positive plate according to a preset sequence;
and hot-pressing the assembly formed after lamination to form the pole group 1.
Specifically, the manufacturing of the pole group 1 further includes:
and after hot pressing is carried out on the assembly formed after lamination to form a pole group 1, X-ray detection is carried out on the pole group 1, the pole group 1 which is qualified in detection enters the next process, and the pole group 1 which is unqualified in detection is reworked or scrapped.
Specifically, the laminating according to the preset sequence comprises circularly laminating the negative plate, the diaphragm, the positive plate and the diaphragm in sequence, wherein the number of times N of circulation is more than or equal to 1.
Optionally, the stacking according to the predetermined sequence includes first placing a layer of diaphragm, then circularly stacking the negative plate, the diaphragm, the positive plate and the diaphragm in sequence, wherein the number of times of circulation N is greater than or equal to 1, and finally stacking a layer of negative plate and a layer of diaphragm in sequence.
According to the assembly process of the lithium ion battery provided by the embodiment, the negative plate, the diaphragm and the positive plate are laminated according to the preset sequence, and the assembly formed after lamination is subjected to hot pressing, so that the diaphragm is more attached to the negative plate and the positive plate, the problems of displacement and the like between the diaphragm and the pole piece are avoided, the X-ray detection is carried out on the pole group 1 after hot pressing, whether the pole pieces in the pole group 1 are aligned or damaged or not is detected, the pole group 1 which is not qualified is reworked or scrapped, and the pole group 1 which is qualified is detected enters the next step.
Specifically, after the peripheral welding is performed on the periphery where the shell and the cover plate 2 are abutted, the method further comprises the following steps:
and helium detection, wherein the helium detection comprises the steps of carrying out short circuit detection on the battery subjected to peripheral welding by adopting helium detection equipment, marking the battery qualified through detection as a qualified battery, and carrying out rework or scrapping on the battery unqualified through detection.
The lithium ion battery assembly process provided by the embodiment is characterized in that the helium detection is further included after the circumference of the shell and the abutting edge of the cover plate 2 is welded, the helium detection is adopted to perform short circuit detection on the battery, the battery qualified in detection is marked as a qualified battery, and the unqualified battery is reworked or scrapped, so that the unqualified battery with the short circuit problem is screened out, and the safety of the battery is improved.
Example two
As shown in fig. 6 to 8, the present embodiment provides a lithium ion battery, which is manufactured by using the lithium ion battery assembling process described above.
The lithium ion battery provided by the embodiment is manufactured by using the lithium ion battery assembling process, compared with the traditional lithium ion battery, the connecting sheet in the structure is omitted, and the number of connecting parts is reduced, so that the condition that the parts are unqualified in mutual connection is reduced, and the reject ratio of the lithium ion battery is reduced.
Specifically, the lithium ion battery includes:
a housing, one end of which is open;
the pole group 1 is placed in the shell, and the pole group 1 is provided with a positive pole lug 11 and a negative pole lug 12;
the cover plate 2 is fixedly connected with the opening end of the shell, and the cover plate 2 faces towards one side inside the shell and is fixedly connected with the pole lug of the pole group 1.
Optionally, the cover plate 2 and the housing are connected by welding.
Optionally, the housing is a cuboid housing.
Specifically, the cover plate 2 is configured with a first connection portion 21 and a second connection portion 22, the first connection portion 21 is adapted to be connected with the positive tab 11, and the second connection portion 22 is adapted to be connected with the negative tab 12.
Optionally, the first connecting portion 21 and the second connecting portion 22 are located on a side of the cover plate 2 facing the inside of the housing, and are connected to an external circuit through a side of the cover plate 2 away from the inside of the housing.
Specifically, the extending direction of the first connection portion 21 and the second connection portion 22 is the same as the extending direction of the positive electrode tab 11 and the negative electrode tab 12 of the electrode assembly 1, and the extending direction of the first connection portion 21 and the second connection portion 22 is perpendicular to the plane where the cover plate 2 is located.
The cover plate 2 has a plate-shaped structure, and the plane of the cover plate 2 is the plane of the plate surface of the plate-shaped structure.
The lithium ion battery provided by the embodiment is characterized in that the cover plate 2 is provided with a first connecting part 21 and a second connecting part 22, the first connecting part 21 is connected with the positive tab 11, the second connecting part 22 is connected with the negative tab 12 to realize the connection of the cover plate 2 and the electrode assembly 1, and the extension direction of the first connecting part 21 and the second connecting part 22 is the same as that of the positive tab 11 and the negative tab 12, and the extension direction of the first connecting part 21 and the second connecting part 22 is perpendicular to the plane where the cover plate 2 is located, so that when the electrode assembly 1 is connected with the connecting part of the cover plate 2 through the tabs, the electrode assembly 1 is perpendicular to the plane where the cover plate 2 is located, and is suitable for being directly installed in the shell, and has a simple structure and convenient operation.
Specifically, the first connection portion 21 is adapted to be connected to the positive tab 11 by welding, and the second connection portion 22 is adapted to be connected to the negative tab 12 by welding.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. A lithium ion battery assembly process, comprising:
manufacturing a pole group (1);
prewelding the electrode lugs of the electrode group (1), and cutting the prewelded electrode lugs;
welding and connecting the cut tab with the cover plate (2);
pasting glue at the welding seal position where the lug is welded with the cover plate (2) to cover the welding seal;
encapsulating the outer side of the pole group (1), and putting the encapsulated pole group (1) into a shell, wherein the open end of the shell is in matched abutting joint with the cover plate (2);
the periphery of the shell, which is abutted against the cover plate (2), is subjected to peripheral welding.
2. The lithium ion battery assembly process according to claim 1, wherein the making of the pole group (1) comprises:
laminating the negative plate, the diaphragm and the positive plate according to a preset sequence;
and hot-pressing the assembly formed after lamination to form the pole group (1).
3. The lithium ion battery assembly process according to claim 2, wherein the fabricating of the pole group (1) further comprises:
and after hot pressing is carried out on the assembly formed after lamination to form the pole group (1), X-ray detection is carried out on the pole group (1), the pole group (1) qualified in detection enters the next process, and the pole group (1) unqualified in detection is reworked or scrapped.
4. The assembly process of the lithium ion battery according to claim 2, wherein the laminating according to the predetermined sequence comprises circularly laminating the negative plate, the diaphragm, the positive plate and the diaphragm in sequence, and the number of times N of the circulation is more than or equal to 1.
5. The lithium ion battery assembly process according to any one of claims 1 to 4, wherein the peripheral welding of the housing against the cover plate (2) further comprises:
and helium detection, wherein the helium detection comprises the steps of carrying out short circuit detection on the battery subjected to peripheral welding by adopting helium detection equipment, marking the battery qualified through detection as a qualified battery, and carrying out rework or scrapping on the battery unqualified through detection.
6. A lithium ion battery, characterized in that the lithium ion battery is manufactured using the lithium ion battery assembly process according to any of the claims 1-5.
7. The lithium ion battery of claim 6, comprising:
a housing, one end of which is open;
the pole group (1) is placed in the shell, and the pole group (1) is provided with a positive pole lug (11) and a negative pole lug (12);
the cover plate (2) is fixedly connected with the opening end of the shell, and the cover plate (2) faces towards one side inside the shell and is fixedly connected with the pole lug of the pole group (1).
8. The lithium ion battery according to claim 7, characterized in that the cover plate (2) is configured with a first connection portion (21) and a second connection portion (22), the first connection portion (21) being adapted to be connected with the positive tab (11), the second connection portion (22) being adapted to be connected with the negative tab (12).
9. The lithium ion battery according to claim 8, wherein the first connection portion (21) and the second connection portion (22) extend in the same direction as the positive electrode tab (11) and the negative electrode tab (12) of the electrode group (1), and the first connection portion (21) and the second connection portion (22) extend in a direction perpendicular to a plane in which the cap plate (2) is located.
10. The lithium ion battery according to claim 8, characterized in that the first connection portion (21) is adapted to be connected to the positive tab (11) by welding and the second connection portion (22) is adapted to be connected to the negative tab (12) by welding.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111270669.9A CN114006053A (en) | 2021-10-29 | 2021-10-29 | Lithium ion battery assembly process and lithium ion battery |
| PCT/CN2022/086565 WO2023071065A1 (en) | 2021-10-29 | 2022-04-13 | Lithium-ion battery assembly process and lithium-ion battery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111270669.9A CN114006053A (en) | 2021-10-29 | 2021-10-29 | Lithium ion battery assembly process and lithium ion battery |
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| CN114006053A true CN114006053A (en) | 2022-02-01 |
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| WO (1) | WO2023071065A1 (en) |
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| CN114709569A (en) * | 2022-03-17 | 2022-07-05 | 合肥国轩高科动力能源有限公司 | Multi-cell lithium battery structure |
| WO2023071065A1 (en) * | 2021-10-29 | 2023-05-04 | 蜂巢能源科技股份有限公司 | Lithium-ion battery assembly process and lithium-ion battery |
| CN116581364A (en) * | 2023-06-15 | 2023-08-11 | 宁夏宝丰昱能科技有限公司 | Battery and method of manufacture |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109888363A (en) * | 2019-03-29 | 2019-06-14 | 广东利元亨智能装备股份有限公司 | A kind of battery core automatic production line |
| CN117393835B (en) * | 2023-12-06 | 2024-02-13 | 苏州华工自动化技术有限公司 | Battery cover plate assembly production line and working method thereof |
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| WO2023071065A1 (en) | 2023-05-04 |
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