CN116598561B - Packaging method of laminated battery cell and laminated battery - Google Patents
Packaging method of laminated battery cell and laminated battery Download PDFInfo
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- CN116598561B CN116598561B CN202310521330.4A CN202310521330A CN116598561B CN 116598561 B CN116598561 B CN 116598561B CN 202310521330 A CN202310521330 A CN 202310521330A CN 116598561 B CN116598561 B CN 116598561B
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- electrode lug
- sealant
- negative electrode
- laminated battery
- positive electrode
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- 238000004806 packaging method and process Methods 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000003466 welding Methods 0.000 claims abstract description 100
- 239000012785 packaging film Substances 0.000 claims abstract description 86
- 229920006280 packaging film Polymers 0.000 claims abstract description 86
- 238000007789 sealing Methods 0.000 claims abstract description 32
- 239000000565 sealant Substances 0.000 claims description 100
- 238000010438 heat treatment Methods 0.000 claims description 17
- 238000003475 lamination Methods 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 3
- 238000003892 spreading Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 21
- 239000000463 material Substances 0.000 abstract description 7
- 239000003292 glue Substances 0.000 abstract description 4
- 239000002390 adhesive tape Substances 0.000 abstract description 3
- 239000003792 electrolyte Substances 0.000 abstract description 3
- 229910052782 aluminium Inorganic materials 0.000 description 13
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 11
- 238000005538 encapsulation Methods 0.000 description 11
- 229920006255 plastic film Polymers 0.000 description 9
- 239000002985 plastic film Substances 0.000 description 9
- 239000000853 adhesive Substances 0.000 description 7
- 230000001070 adhesive effect Effects 0.000 description 7
- 239000000155 melt Substances 0.000 description 6
- 239000012528 membrane Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 101100460844 Mus musculus Nr2f6 gene Proteins 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0413—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
-
- 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
-
- 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
Abstract
The invention discloses a packaging method of a laminated battery core and a laminated battery, wherein the packaging method is characterized in that the contact surfaces between the lugs of adjacent positive plates are fixedly connected and then used as the positive lugs of the laminated battery core, the contact surfaces between the lugs of the adjacent negative plates are fixedly connected and then used as the negative lugs of the laminated battery core, and sealing glue is respectively arranged between a packaging film and the positive lugs and between the packaging film and the negative lugs and fixedly connected, so that the sealing reliability of a top sealing seal can be improved, the electrolyte in the laminated battery is ensured to be sealed inside the laminated battery to improve the use safety of the laminated battery, the arrangement of a switching lug is omitted, the space required by a welding position is not required, the volume of the laminated battery is reduced, the arrangement of a high-temperature adhesive tape is omitted, the material types are reduced, the influence of the strength of the welding position on the safety of the laminated battery is avoided, and the heat generated when a current passes through the welding position is avoided, and the laminated battery is damaged, so that the technical effect of improving the use safety of the laminated battery is achieved.
Description
Technical Field
The invention belongs to the technical field of batteries, and particularly relates to a packaging method of a laminated battery cell and a laminated battery.
Background
Referring to fig. 1, in the conventional laminated soft-pack battery package, the tab of the positive electrode plate and the tab of the negative electrode plate in the laminated battery core 1 are welded and fixed with the corresponding switching tab 8, and then the welding position and the laminated battery core are packaged by an aluminum plastic film to form a laminated battery, wherein the switching tab extends out of the aluminum plastic film to serve as the positive electrode and the negative electrode which are externally connected by the laminated battery core, and the welding position is located in the aluminum plastic film and is protected by the aluminum plastic film.
Wherein, need paste high temperature sticky tape 10 between the welding position's of welding position welding seal and plastic-aluminum membrane formation contact position and carry out the insulating protection of welding position, avoid the burr of welding position to prick the PP layer in the plastic-aluminum membrane, make the utmost point ear of lamination electric core take place the electricity with the aluminum product and switch on, lead to the battery short circuit and can't use, and the setting of high temperature sticky tape has increased the material kind to the welding seal is located the inside of encapsulation and has following shortcoming:
(1) The solder marks are located inside the package, thus reducing the utilization rate of the internal space of the battery, and reducing the volume specific capacity of the laminated soft pack battery, resulting in an increase in the volume of the battery and an increase in the limit of the installation space of the battery.
(2) Because the welding process needs to apply pressure to the lug and the switching lug of the lamination electric core, after the pressure is removed, the edge of the lug of the switching lug and the lug of the lamination electric core is easy to warp, and the risk of puncturing the PP layer of the aluminum plastic film exists, so that the short circuit inside the battery is caused, and the normal use of the lamination battery is influenced.
(3) When the laminated battery discharges, current passes through the welding position between the lug of the switching lug and the lug of the laminated battery core, heat accumulation at the position is easy to cause to melt the PP layer of the high-temperature adhesive tape and the aluminum plastic film, the safety of the battery is reduced, the battery is damaged, and the normal use of the battery is influenced.
Disclosure of Invention
In view of the above, the present invention discloses a method for packaging a laminated battery cell and a laminated battery, so as to overcome or at least partially solve the above problems.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
in one aspect, the invention provides a method for packaging a laminated battery cell, which specifically comprises the following steps:
step S1, forming a positive electrode lug and a negative electrode lug: along the stacking direction of the positive plates, the contact surfaces between the lugs of the adjacent positive plates are fixedly connected to form positive lugs of the laminated battery cell; along the stacking direction of the negative electrode plates, the contact surfaces between the lugs of the adjacent negative electrode plates are fixedly connected to form the negative electrode lugs of the laminated battery cell;
step S2, installing sealant: the sealant is positioned between the positive electrode lug and the packaging film and between the negative electrode lug and the packaging film;
step S3, packaging the laminated battery cell: firstly, placing the lamination battery cell in a pit of the packaging film; then the packaging film wraps the laminated battery cell, the positive electrode lug and the negative electrode lug respectively; heating the packaging film through a battery packaging pressure head, and respectively sealing and fixing the packaging film, the laminated battery cell, the positive electrode lug and the negative electrode lug to finish packaging of the laminated battery cell;
wherein the melt adhesive temperature of the sealant is lower than the melt adhesive temperature of the packaging film.
Optionally, the sealant is pre-adhered to the surface of the positive electrode tab and the surface of the negative electrode tab, and the step S2 specifically operates as follows:
step S201, pre-sticking sealant: spreading the sealant on the surface of the positive electrode lug and the surface of the negative electrode lug, and respectively attaching and connecting the sealant;
step S202, fixing sealant and a laminated cell: heating the positive electrode lug and the negative electrode lug through a lug heating pressure head, wherein the positive electrode lug and the sealant and the negative electrode lug and the sealant are respectively connected and fixed;
correspondingly, the specific operation of the step S3 is as follows:
firstly, placing the laminated battery cell in a pit of the packaging film; then the packaging film wraps the laminated battery cell, the positive electrode lug, the negative electrode lug and the sealant respectively; and finally, heating the packaging film through the battery packaging pressure head, and sealing and fixing the heated packaging film, the laminated battery cell, the positive electrode lug, the negative electrode lug and the sealant respectively to finish the packaging of the laminated battery cell.
Optionally, the sealant is pre-adhered to the packaging film, and the step S2 specifically includes the following steps:
step S201, pre-sticking sealant: pre-adhering the sealant to the packaging film;
the sealant is positioned on the packaging film and can be contacted with the surface of the positive electrode lug and the surface of the negative electrode lug;
step S202, fixing sealant and a laminated cell: heating the sealant by using the battery packaging pressure head, wherein the heated sealant is completely attached and fixed with the positive electrode lug and the heated sealant is completely attached and fixed with the negative electrode lug;
correspondingly, the specific operation of the step S3 is as follows:
firstly, placing the laminated battery cell in a pit of the packaging film; then the packaging film wraps the laminated battery cell, the positive electrode lug and the negative electrode lug respectively; and finally, heating the packaging film through the battery packaging pressure head, and sealing and fixing the heated packaging film, the laminated battery cell, the positive electrode lug and the negative electrode lug respectively to finish packaging of the laminated battery cell.
Optionally, in the step S3, the battery packaging pressure head packages the laminated battery core, and the tab heating pressure head always heats the positive tab and the negative tab.
Optionally, in the step S1, the contact surfaces between the tabs of the positive electrode tab and the contact surfaces between the tabs of the negative electrode tab are fixed by welding respectively.
Optionally, in the step S1, the contact surfaces between the tabs of the positive electrode sheet and the contact surfaces between the tabs of the negative electrode sheet are respectively fixed by ultrasonic welding; and in the step S2, the sealant is located at the welding position of the positive tab and the welding position of the negative tab.
Optionally, the width dimension of the welding position of the positive electrode tab is equal to the width dimension of the positive electrode tab, and the width dimension of the welding position of the negative electrode tab is equal to the width dimension of the negative electrode tab.
Optionally, the length dimension of the welding position of the positive electrode lug is greater than the width dimension of the top seal of the positive electrode lug, and the length dimension of the welding position of the negative electrode lug is greater than the width dimension of the top seal of the negative electrode lug.
Optionally, the length dimension of the welding teeth of the welding head for ultrasonic welding and the width dimension of the welding teeth of the welding head for ultrasonic welding are not smaller than the length dimension of the welding position of the positive electrode lug and the width dimension of the welding position of the positive electrode lug, and are not smaller than the length dimension of the welding position of the negative electrode lug and the width dimension of the welding position of the negative electrode lug.
On the other hand, the invention also discloses a laminated battery, and the packaging method of the laminated battery core comprises at least one laminated battery core, a packaging film, a positive electrode lug and a negative electrode lug; the laminated battery cell is respectively connected with the positive electrode lug and the negative electrode lug, and the packaging film is respectively sealed and packaged with the laminated battery cell, the positive electrode lug and the negative electrode lug;
the laminated battery cell comprises a plurality of positive electrode plates integrally formed with the electrode lugs and a plurality of negative electrode plates integrally formed with the electrode lugs; along the stacking direction, the contact surfaces between the lugs of the adjacent positive electrode plates are fixedly connected to serve as positive electrode lugs, and the contact surfaces between the lugs of the adjacent negative electrode plates are fixedly connected to serve as negative electrode lugs; and sealant is respectively arranged between the packaging film and the surface of the positive electrode lug and between the packaging film and the surface of the negative electrode lug and is fixedly connected with the packaging film.
The invention has the advantages and beneficial effects that:
in the packaging method of the laminated battery core and the laminated battery, the contact surfaces between the lugs of the adjacent positive plates are fixedly connected to serve as positive lugs, and the contact surfaces between the lugs of the adjacent negative plates are fixedly connected to serve as negative lugs, so that the arrangement of the switching lugs is omitted, the space required by welding positions between the lugs of the positive plates and the switching lugs and between the lugs of the negative plates and the switching lugs is not required in the laminated battery, the utilization rate of the space in the laminated battery is improved, the volume of the laminated battery is reduced, the arrangement of high-temperature adhesive tapes is omitted, and the material types are reduced. Meanwhile, the safety of the laminated battery is prevented from being influenced by the welding effect, and the laminated battery is prevented from being damaged due to heat generated when current passes through the welding position, so that the technical effect of improving the use safety of the laminated battery is achieved.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
FIG. 1 is a cross-sectional view of a prior art laminated battery;
fig. 2 is a cross-sectional view of a laminated battery of the present invention;
FIG. 3 is a schematic view of the structure of a battery pack pressure head in a laminated battery of the present invention;
fig. 4 is a schematic structural diagram of a connection between a sealant and a positive tab in a laminated battery according to the first embodiment;
fig. 5 is a schematic structural diagram of a packaging film and a positive tab top seal in a laminated battery according to the first embodiment.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments of the present invention and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The following describes in detail the technical solutions provided by the embodiments of the present invention with reference to the accompanying drawings.
Example 1
As shown in fig. 2 to 5, the present embodiment discloses a laminated battery including a laminated cell 1, a positive electrode tab 2, a negative electrode tab 3, and an encapsulation film 4. The laminated battery cell 1 is respectively connected with the positive electrode lug 2 and the laminated battery cell 1 is respectively connected with the negative electrode lug 3, and the packaging film 4 is respectively sealed and packaged with the laminated battery cell 1, the packaging film 4 is respectively sealed and packaged with the positive electrode lug 2 and the packaging film 4 is respectively sealed and packaged with the negative electrode lug 3.
The laminated battery cell 1 comprises a plurality of positive electrode plates integrally formed with the electrode lugs and a plurality of negative electrode plates integrally formed with the electrode lugs. Along the stacking direction, the contact surfaces between the lugs of the adjacent positive plates are fixedly connected into a whole and serve as positive lugs 2, and the contact surfaces between the lugs of the adjacent negative plates are fixedly connected into a whole and serve as negative lugs 3. And sealing glue 5 is respectively arranged between the surfaces of the packaging film 4 and the positive electrode lug 2 and between the surfaces of the packaging film 4 and the negative electrode lug 3 and is fixedly connected, so that the sealing reliability of the top sealing seal formed by connecting the positive electrode lug with the packaging film and the top sealing seal formed by connecting the negative electrode lug with the packaging film can be improved through the sealing glue, the electrolyte in the laminated battery is ensured to be sealed inside the laminated battery, and the use safety of the laminated battery is improved.
In the laminated battery of this embodiment, through the contact surface fixed connection between the utmost point ear of adjacent positive plate as the positive electrode ear, the contact surface fixed connection between the utmost point ear of adjacent negative plate is as the negative electrode ear, the setting of switching utmost point ear has been saved like this for the inside of laminated battery need not to set up the space that the welding position needs between the utmost point ear of positive plate and switching utmost point ear and between the utmost point ear of negative plate and the switching utmost point ear, thereby promotes the utilization ratio of laminated battery inner space, has reduced laminated battery's volume, has also saved the setting of high temperature sticky tape moreover, has reduced the material kind. Meanwhile, the safety of the laminated battery is prevented from being influenced by the welding effect, and the laminated battery is prevented from being damaged due to heat generated when current passes through the welding position, so that the technical effect of improving the use safety of the laminated battery is achieved.
In other embodiments, the number of laminated cells may also be adjusted according to the voltage requirements of the laminated battery, etc.
In addition, in this embodiment, along the stacking direction, between the tabs of a plurality of positive plates and between the tabs of a plurality of negative plates are fixed by welding respectively, thereby improving the connection stability.
Of course, in other embodiments, according to different processing technologies of the laminated battery, the tabs of the plurality of positive plates and the tabs of the plurality of negative plates are respectively connected through conductive adhesive, so that the technical effect of realizing connection stability can be achieved.
Further, the electrode lugs of the positive electrode plates and the electrode lugs of the negative electrode plates are respectively welded together through ultrasonic waves to form a whole, so that the welding effect can be improved, and the sealing performance and the safety of the laminated battery are improved.
In this case, the seal 5 is respectively bonded to the seal position 61 of the positive tab (i.e., the seal position formed by welding) and the seal position 62 of the negative tab, so that the sealing between the seal position and the packaging film is improved, and the safety of the laminated battery is ensured.
In the ultrasonic welding process, the welding contact surface texture of the welding head is in a shallow tooth shape, the filling difficulty of the sealant can be simplified through the welding head in the shallow tooth shape, the sealing reliability of the position of the positive electrode lug and the position of the negative electrode lug is ensured, the difficulty that the welding contact surface is excessively deep in the process of filling the sealant with the welding tooth mark is avoided, the sealing effect of the top sealing seal is avoided, and the normal use of the laminated battery is prevented from being influenced due to the leakage of electrolyte.
Of course, in other embodiments, a welding manner of resistance welding may also be used, which can also achieve the technical effect of improving the sealability of the laminated battery.
Furthermore, in the present embodiment, preferably, the width dimension of the welding position 61 of the positive tab is equal to the width dimension of the positive tab, and the width dimension of the welding position 62 of the negative tab is equal to the width dimension of the negative tab, so that the connection reliability of the welding position of the positive tab and the welding position of the negative tab is improved, and the effect of improving the sealability of the laminated battery is achieved.
Preferably, as shown in connection with fig. 2, the length dimension l of the solder printing position 61 of the positive tab 1 Width dimension d of top seal 9 greater than positive tab 1 The length dimension of the welding position 62 of the negative electrode lug is larger than the width dimension of the top seal of the negative electrode lug, so that the sealing effect of the top seal of the positive electrode lug and the top seal of the negative electrode lug is improved.
Further, the length dimension of the welding teeth of the welding head for ultrasonic welding is not smaller than the length dimension of the welding position of the positive electrode lug, the width dimension of the welding teeth of the welding head for ultrasonic welding is not smaller than the width dimension of the welding position of the positive electrode lug, and meanwhile, the length dimension of the welding teeth of the welding head for ultrasonic welding is not smaller than the length dimension of the welding position of the negative electrode lug, and the width dimension of the welding teeth of the welding head for ultrasonic welding is not smaller than the width dimension of the welding position of the negative electrode lug, so that the welding of the whole electrode lug is completed at one time, the welding effect of the positive electrode lug and the negative electrode lug is ensured, and the phenomenon that intervals appear between adjacent welding positions due to repeated clamping welding of the welding head for ultrasonic welding is avoided, and the sealing performance of a laminated battery is affected.
Meanwhile, as shown in connection with fig. 2, in the present embodiment, the sealant 5 is along d 1 The dimension in the direction is greater than the dimension d along the top seal 9 of the positive electrode lug 1 The dimension in the direction and the sealant 5 along the direction perpendicular to d 1 The dimension in the direction is larger than the width dimension of the positive electrode tab 2. Likewise, sealant 5 is along d 1 The dimension in the direction is greater than the top seal of the negative electrode lug 3 along d 1 The dimensions in the direction and the sealant along the direction perpendicular to d 1 The dimension in the direction is larger than the width dimension of the negative electrode tab. Like this, can make the sealant wrap up the required sealing position of anodal ear and negative pole ear to reach the technical effect that promotes the top seal of anodal ear and the top seal leakproofness of negative pole ear.
Preferably, in this embodiment, edges of the positive electrode tab 2 and the negative electrode tab 3 formed after welding are cut respectively, so that the uniformity of the edges of the positive electrode tab and the negative electrode tab can be improved, and the problem that the uneven edges damage the packaging film to affect the safety of the internal circuit of the laminated battery is avoided, thereby achieving the technical effect of improving the safety of the laminated battery.
In addition, preferably, the sealant 5 is solid, meets the requirement of the use environment of the laminated battery, and has the characteristic of difficult flowing around by utilizing the solid sealant, so that the placement position of the sealant is convenient to control, and the tightness of the connection between the laminated battery cell and the packaging film is ensured.
The sealant 5 has insulativity, further improves the insulation effect between the positive electrode lug and the packaging film and between the negative electrode lug and the packaging film, and avoids the phenomenon that the laminated battery cannot be used due to internal short circuit, thereby achieving the technical effect of improving the safety of the laminated battery.
Taking the positive electrode lug as an example, the packaging films 4 on the positive electrode lug and the two sides of the positive electrode lug are positioned between an upper pressure head 73 of a battery packaging pressure head and a lower pressure head 74 of the battery packaging pressure head, so that the packaging films at the position of the positive electrode lug can be heated, a PP layer in the aluminum plastic film is melted, and the packaging of the laminated battery cell is realized.
Preferably, the upper pressure head 73 of the battery packaging pressure head is provided with a groove 731, the groove 731 is located at a position corresponding to the sealant 5, so that avoidance can be formed at the position of the sealant, so that a mounting space for setting the sealant is reserved between the packaging film 4 and the positive electrode lug 2 and between the packaging film 4 and the negative electrode lug 3, the sealing thickness between the packaging film and the positive electrode lug and between the packaging film and the negative electrode lug is ensured, and the sealing effect is improved.
As shown in fig. 2 to 5, the specific operation procedure for packaging the laminated battery cell of the embodiment is as follows:
step S1, forming a positive electrode lug 2 and a negative electrode lug 3.
Along the stacking direction of the positive plates, the contact surfaces between the lugs of the adjacent positive plates are fixedly connected to form the positive lugs 2 of the laminated battery cell. Along the stacking direction of the negative electrode plates, the contact surfaces between the lugs of the adjacent negative electrode plates are fixedly connected to form the negative electrode lug 3 of the laminated battery cell.
The contact surfaces between the lugs of the adjacent positive plates and the contact surfaces between the lugs of the adjacent negative plates are respectively fixedly connected in a welding mode, and are preferably fixedly connected in an ultrasonic welding mode, so that the tightness and the connection stability between the formed positive lugs and between the formed negative lugs can be ensured.
And S2, installing the sealant 5. In this embodiment, the sealant 5 is pre-adhered to the surface of the positive electrode tab 2 and the surface of the negative electrode tab 3, and the specific operation steps are as follows:
step S201, pre-adhering the sealant 5.
In this embodiment, the sealant 5 is sucked by the upper suction cup 51 and the lower suction cup 52, respectively, and then the sealant 5 is pre-adhered to the surface of the positive electrode tab 2 and the surface of the negative electrode tab 3 at the same time. Specifically, the bonding agent is pre-bonded at the welding position 61 of the positive electrode lug and the welding position 62 of the negative electrode lug, so that the sealing performance of the connection between the welding position of the positive electrode lug and the packaging film and between the welding position of the negative electrode lug and the packaging film is improved.
Wherein, sealant 5 tiling and laminating set up in the both sides of anodal ear 2 and the both sides of negative pole ear 3, can further promote sealed effect.
Step S202, fixing the sealant 5 and the laminated battery cell 1.
The positive electrode lug 2 and the negative electrode lug 3 are heated by the electrode lug heating pressure head, and the positive electrode lug 2 and the sealant 5 and the negative electrode lug 3 and the sealant 5 are respectively connected and fixed.
The tab heating ram includes a tab upper ram 71 and a tab lower ram 72. Taking the positive electrode lug as an example, the two sides of the positive electrode lug and the two sealant are respectively and simultaneously connected and fixed through the upper electrode lug pressure head 71 and the lower electrode lug pressure head 72 which are respectively and simultaneously contacted and heated with the two sides of the positive electrode lug 2, so that the sealing efficiency can be improved.
And S3, packaging the laminated battery cell 1.
Firstly, the laminated battery cell 1 after pre-adhesion is placed in a pit of the packaging film 4 formed by punching. And then the packaging film 4 is used for respectively packaging the laminated battery cell 1, the positive electrode lug 2, the negative electrode lug 3 and the sealant 5. Finally, the packaging film 4 is heated through a battery packaging pressure head, and the heated packaging film 4, the laminated battery cell 1, the positive electrode lug 2, the negative electrode lug 3 and the sealant 5 are respectively sealed and fixed, so that the packaging of the laminated battery cell is completed.
Taking top sealing of the positive electrode lug as an example, the sealant on the surface of the positive electrode lug is located between an upper pressure head 73 of a battery packaging pressure head and a lower pressure head 74 of the battery packaging pressure head, and the packaging film 4 on the surface of the positive electrode lug can be heated simultaneously through the upper pressure head 73 of the battery packaging pressure head and the lower pressure head 74 of the battery packaging pressure head, so that connection and fixation between the packaging film and the sealant are realized, and further top sealing of the laminated battery core is realized.
Further, preferably, in this process, the tab heating pressure head is always in contact with the positive electrode tab 2, and is also in contact with the negative electrode tab 3, so that the positive electrode tab 2 and the negative electrode tab 3 can be heated respectively all the time, and the adhesiveness of the sealant can be further improved, thereby enhancing the sealing effect of the top seal.
Meanwhile, the melt adhesive temperature of the sealant needs to be lower than that of the packaging film, specifically lower than that of the PP layer of the aluminum plastic film, for example, the melt adhesive temperature of the sealant is lower than that of the PP layer by 5-10 ℃, so that the PP layer of the aluminum plastic film can be directly melted by the sealant in a molten state in the sealing process, the packaging film can be directly packaged and connected, the position of the packaging film can not be adjusted, the flatness of the packaging film is affected, and the sealing performance of the packaging film is affected.
Based on this, utilize the melt adhesive temperature of sealant to be less than the melt adhesive temperature of encapsulation membrane for the sealant can bond fixedly respectively with the material of encapsulation membrane, the material of anodal ear and the material of negative pole ear, and the sealant can be firm bonding on aluminium metal and copper metal promptly, can not damage the encapsulation membrane again, thereby reaches the technological effect that promotes sealed encapsulation stability.
Example two
The embodiment discloses another specific operation process for packaging the laminated battery cells. Wherein, unlike the first embodiment, the sealant in the present embodiment is pre-adhered to the encapsulation film. In this way, the sealing glue can be glued on the packaging film in advance, that is, the step S2 can be performed simultaneously with the step S1 or before the step S1, so that the efficiency of packaging the laminated battery cells is improved.
In this embodiment, the operations of step S2 and step S3 are adjusted, and the structure of the laminated battery in embodiment one can be obtained in the same manner as in step S1 in embodiment one.
Specifically, the specific operation procedure of step S2 and step S3 is as follows:
and S2, installing the sealant 5.
Step S201, pre-adhering the sealant 5.
In this embodiment, the sealant 5 is sucked by the upper suction cup 51 and the lower suction cup 52, respectively, and then the sealant 5 is pre-adhered to the encapsulation film 4, respectively. Specifically, the sealant 5 is located on the encapsulation film 4 at a position that can be in contact with the surface of the positive electrode tab 2 and on the encapsulation film 4 at a position that can be in contact with the surface of the negative electrode tab 3.
Step S202, fixing the sealant 5 and the laminated battery cell 1. The battery packaging pressure head is selected to heat the position of the corresponding packaging film 4 provided with the sealant 5, and the heated sealant 5 is completely attached and fixed with the positive electrode lug 2 and the heated sealant 5 and the negative electrode lug 3.
And S3, packaging the laminated battery cell 1.
The laminated cell 1 is first placed in a recess of the encapsulation film 4. And then the packaging film 4 wraps the laminated battery cell 1, the positive electrode lug 2 and the negative electrode lug 3 respectively. And finally, respectively heating the two sides of the packaging film through an upper pressure head 73 of the battery packaging pressure head and a lower pressure head 74 of the battery packaging pressure head, and respectively sealing and fixing the heated packaging film 4, the laminated battery cell 1, the positive electrode lug 2 and the negative electrode lug 3 to finish the packaging of the laminated battery cell.
The foregoing is merely a specific embodiment of the invention and other modifications and variations can be made by those skilled in the art in light of the above teachings. It is to be understood by persons skilled in the art that the foregoing detailed description is provided for the purpose of illustrating the invention more fully, and that the scope of the invention is defined by the appended claims.
Claims (2)
1. The packaging method of the laminated battery cell is characterized by comprising the following steps of: the method specifically comprises the following steps:
step S1, forming a positive electrode lug and a negative electrode lug: along the stacking direction of the positive plates, the contact surfaces between the lugs of the adjacent positive plates are fixedly connected to form positive lugs of the laminated battery cell; along the stacking direction of the negative electrode plates, the contact surfaces between the lugs of the adjacent negative electrode plates are fixedly connected to form the negative electrode lugs of the laminated battery cell;
in the step S1, the contact surfaces between the tabs of the positive electrode sheet and the contact surfaces between the tabs of the negative electrode sheet are fixed by welding respectively, and can be fixed by ultrasonic welding, and the texture of the welded contact surfaces adopts a shallow tooth shape; the length dimension of the welding teeth of the welding head for ultrasonic welding and the width dimension of the welding teeth of the welding head for ultrasonic welding are respectively not smaller than the length dimension of the welding position of the positive electrode lug and the width dimension of the welding position of the positive electrode lug, and are not smaller than the length dimension of the welding position of the negative electrode lug and the width dimension of the welding position of the negative electrode lug;
the width dimension of the welding position of the positive electrode lug is equal to the width dimension of the positive electrode lug, and the width dimension of the welding position of the negative electrode lug is equal to the width dimension of the negative electrode lug; the length dimension of the welding position of the positive electrode lug is larger than the width dimension of the top seal of the positive electrode lug, and the length dimension of the welding position of the negative electrode lug is larger than the width dimension of the top seal of the negative electrode lug;
step S2, installing sealant: the sealant is positioned between the positive electrode lug and the packaging film and between the negative electrode lug and the packaging film; the sealant is positioned at the welding position of the positive electrode lug and the welding position of the negative electrode lug; the length dimension of the sealant is larger than the width dimension of the top seal of the positive electrode lug, and the width dimension of the sealant is larger than the length dimension of the top seal of the positive electrode lug; the length dimension of the sealant is larger than the width dimension of the top seal of the negative electrode lug, and the width dimension of the sealant is larger than the length dimension of the top seal of the negative electrode lug;
the sealant is flatly paved on the surface of the positive electrode lug and the surface of the negative electrode lug, and the sealant and the negative electrode lug are respectively attached and connected; or pre-adhering the sealant on the packaging film;
step S3, packaging the laminated battery cell: firstly, placing the lamination battery cell in a pit of the packaging film; then the packaging film wraps the laminated battery cell, the positive electrode lug and the negative electrode lug respectively; heating the packaging film through a battery packaging pressure head, and respectively sealing and fixing the packaging film, the laminated battery cell, the positive electrode lug and the negative electrode lug to finish packaging of the laminated battery cell; the upper pressure head of the battery packaging pressure head is provided with a groove, and the groove is positioned at a position corresponding to the sealant;
the temperature of the sealant is lower than that of the packaging film, and the sealant is solid sealant;
when the sealant is pre-adhered to the surface of the positive electrode tab and the surface of the negative electrode tab, the step S2 specifically comprises the following steps:
step S201, pre-sticking sealant: spreading the sealant on the surface of the positive electrode lug and the surface of the negative electrode lug, and respectively attaching and connecting the sealant;
step S202, fixing sealant and a laminated cell: heating the positive electrode lug and the negative electrode lug through a lug heating pressure head, wherein the positive electrode lug and the sealant and the negative electrode lug and the sealant are respectively connected and fixed;
correspondingly, the specific operation of the step S3 is as follows:
firstly, placing the laminated battery cell in a pit of the packaging film; then the packaging film wraps the laminated battery cell, the positive electrode lug, the negative electrode lug and the sealant respectively; finally, the packaging film is heated through the battery packaging pressure head, and the heated packaging film, the laminated battery cell, the positive electrode lug, the negative electrode lug and the sealant are respectively sealed and fixed, so that the packaging of the laminated battery cell is completed;
in the step S3, the tab heating pressure head always heats the positive tab and the negative tab while the battery packaging pressure head packages the laminated battery cells;
when the sealant is pre-adhered to the packaging film, the step S2 specifically comprises the following steps:
step S201, pre-sticking sealant: pre-adhering the sealant to the packaging film;
the sealant is positioned on the packaging film and can be contacted with the surface of the positive electrode lug and the surface of the negative electrode lug;
step S202, fixing sealant and a laminated cell: heating the sealant by using the battery packaging pressure head, wherein the heated sealant is completely attached and fixed with the positive electrode lug and the heated sealant is completely attached and fixed with the negative electrode lug;
correspondingly, the specific operation of the step S3 is as follows:
firstly, placing the laminated battery cell in a pit of the packaging film; then the packaging film wraps the laminated battery cell, the positive electrode lug and the negative electrode lug respectively; and finally, heating the packaging film through the battery packaging pressure head, and sealing and fixing the heated packaging film, the laminated battery cell, the positive electrode lug and the negative electrode lug respectively to finish packaging of the laminated battery cell.
2. A laminated battery characterized by: a packaging method for applying the laminated battery cell according to claim 1, comprising at least one laminated battery cell, a packaging film, a positive electrode lug and a negative electrode lug; the laminated battery cell is respectively connected with the positive electrode lug and the negative electrode lug, and the packaging film is respectively sealed and packaged with the laminated battery cell, the positive electrode lug and the negative electrode lug;
the laminated battery cell comprises a plurality of positive electrode plates integrally formed with the electrode lugs and a plurality of negative electrode plates integrally formed with the electrode lugs; along the stacking direction, the contact surfaces between the lugs of the adjacent positive electrode plates are fixedly connected to serve as positive electrode lugs, and the contact surfaces between the lugs of the adjacent negative electrode plates are fixedly connected to serve as negative electrode lugs; and sealant is respectively arranged between the packaging film and the surface of the positive electrode lug and between the packaging film and the surface of the negative electrode lug and is fixedly connected with the packaging film.
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Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005216623A (en) * | 2004-01-28 | 2005-08-11 | Sanyo Electric Co Ltd | Laminated battery and its manufacturing method |
| CN202094228U (en) * | 2011-05-26 | 2011-12-28 | 东莞市利赛奥新能源科技有限公司 | Flexible package lithium ion battery with bump recovery device |
| CN106784998A (en) * | 2017-01-22 | 2017-05-31 | 宁德新能源科技有限公司 | A kind of secondary cell and heater |
| CN109560221A (en) * | 2018-12-03 | 2019-04-02 | 桑顿新能源科技有限公司 | The method for improving soft-package battery aluminum plastic film package reliability |
| CN210576287U (en) * | 2019-12-05 | 2020-05-19 | 杭州威宏能源科技有限公司 | Laminated lithium battery with double pairs of tabs |
| CN210926140U (en) * | 2019-11-25 | 2020-07-03 | 惠州锂威新能源科技有限公司 | High-safety lithium ion battery |
| CN211907598U (en) * | 2020-04-01 | 2020-11-10 | 湖北亿纬动力有限公司 | Battery packaging end socket and battery |
| CN212113874U (en) * | 2020-07-01 | 2020-12-08 | 杭州威宏能源科技有限公司 | Special-shaped laminated battery |
| CN112350031A (en) * | 2019-07-22 | 2021-02-09 | 宁德新能源科技有限公司 | Battery with a battery cell |
| CN112421188A (en) * | 2020-10-30 | 2021-02-26 | 蜂巢能源科技有限公司 | Welding method of tab and cover plate, battery module, battery pack and vehicle |
| CN215869700U (en) * | 2021-06-21 | 2022-02-18 | 合肥国轩高科动力能源有限公司 | Soft package lithium ion battery cell without Tab sheet |
| CN114242944A (en) * | 2022-01-14 | 2022-03-25 | 惠州市赛能电池有限公司 | Negative plate component, battery core, preparation method of battery core and laminated battery |
| CN115837510A (en) * | 2021-11-09 | 2023-03-24 | 宁德时代新能源科技股份有限公司 | Tab welding method, welding tool, battery monomer, battery and power utilization device |
| CN218919071U (en) * | 2022-11-21 | 2023-04-25 | 珠海冠宇电池股份有限公司 | Battery cell |
-
2023
- 2023-05-09 CN CN202310521330.4A patent/CN116598561B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005216623A (en) * | 2004-01-28 | 2005-08-11 | Sanyo Electric Co Ltd | Laminated battery and its manufacturing method |
| CN202094228U (en) * | 2011-05-26 | 2011-12-28 | 东莞市利赛奥新能源科技有限公司 | Flexible package lithium ion battery with bump recovery device |
| CN106784998A (en) * | 2017-01-22 | 2017-05-31 | 宁德新能源科技有限公司 | A kind of secondary cell and heater |
| CN109560221A (en) * | 2018-12-03 | 2019-04-02 | 桑顿新能源科技有限公司 | The method for improving soft-package battery aluminum plastic film package reliability |
| CN112350031A (en) * | 2019-07-22 | 2021-02-09 | 宁德新能源科技有限公司 | Battery with a battery cell |
| CN210926140U (en) * | 2019-11-25 | 2020-07-03 | 惠州锂威新能源科技有限公司 | High-safety lithium ion battery |
| CN210576287U (en) * | 2019-12-05 | 2020-05-19 | 杭州威宏能源科技有限公司 | Laminated lithium battery with double pairs of tabs |
| CN211907598U (en) * | 2020-04-01 | 2020-11-10 | 湖北亿纬动力有限公司 | Battery packaging end socket and battery |
| CN212113874U (en) * | 2020-07-01 | 2020-12-08 | 杭州威宏能源科技有限公司 | Special-shaped laminated battery |
| CN112421188A (en) * | 2020-10-30 | 2021-02-26 | 蜂巢能源科技有限公司 | Welding method of tab and cover plate, battery module, battery pack and vehicle |
| CN215869700U (en) * | 2021-06-21 | 2022-02-18 | 合肥国轩高科动力能源有限公司 | Soft package lithium ion battery cell without Tab sheet |
| CN115837510A (en) * | 2021-11-09 | 2023-03-24 | 宁德时代新能源科技股份有限公司 | Tab welding method, welding tool, battery monomer, battery and power utilization device |
| CN114242944A (en) * | 2022-01-14 | 2022-03-25 | 惠州市赛能电池有限公司 | Negative plate component, battery core, preparation method of battery core and laminated battery |
| CN218919071U (en) * | 2022-11-21 | 2023-04-25 | 珠海冠宇电池股份有限公司 | Battery cell |
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| CN116598561A (en) | 2023-08-15 |
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Address after: Room 601, Building B, Hanyu Innovation Industry Building, No. 7 Guansheng Fourth Road, Gaoxin Park, Guanhu Street, Longhua District, Shenzhen City, Guangdong Province, 518110 Applicant after: Shenzhen Xinjie Energy Technology Co.,Ltd. Address before: Room 601, Building B, Hanyu Innovation Industry Building, No. 7 Guansheng Fourth Road, Gaoxin Park, Guanhu Street, Longhua District, Shenzhen City, Guangdong Province, 518110 Applicant before: Shenzhen Xinshijie Technology Co.,Ltd. |
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