CN113363555A - Lithium ion battery for improving leakage failure of soft package battery and packaging process thereof - Google Patents
Lithium ion battery for improving leakage failure of soft package battery and packaging process thereof Download PDFInfo
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- CN113363555A CN113363555A CN202110481526.6A CN202110481526A CN113363555A CN 113363555 A CN113363555 A CN 113363555A CN 202110481526 A CN202110481526 A CN 202110481526A CN 113363555 A CN113363555 A CN 113363555A
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 35
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 35
- 238000012858 packaging process Methods 0.000 title claims description 6
- 238000007789 sealing Methods 0.000 claims abstract description 139
- 239000002985 plastic film Substances 0.000 claims abstract description 61
- 229920006255 plastic film Polymers 0.000 claims abstract description 61
- 238000003466 welding Methods 0.000 claims abstract description 58
- 239000003292 glue Substances 0.000 claims abstract description 36
- 238000004806 packaging method and process Methods 0.000 claims abstract description 27
- 229910052782 aluminium Inorganic materials 0.000 claims description 22
- 239000007788 liquid Substances 0.000 claims description 21
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 16
- 239000011888 foil Substances 0.000 claims description 11
- 239000000758 substrate Substances 0.000 claims description 9
- 230000032683 aging Effects 0.000 claims description 7
- 238000005096 rolling process Methods 0.000 claims description 7
- 238000002791 soaking Methods 0.000 claims description 7
- 239000012528 membrane Substances 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 238000005253 cladding Methods 0.000 claims description 2
- 238000005520 cutting process Methods 0.000 claims description 2
- 229920000642 polymer Polymers 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 15
- 238000009413 insulation Methods 0.000 abstract description 7
- 230000004927 fusion Effects 0.000 abstract description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052744 lithium Inorganic materials 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 239000005022 packaging material Substances 0.000 description 21
- 239000011159 matrix material Substances 0.000 description 14
- 238000000034 method Methods 0.000 description 13
- 238000002347 injection Methods 0.000 description 10
- 239000007924 injection Substances 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 7
- 239000000126 substance Substances 0.000 description 6
- 210000004712 air sac Anatomy 0.000 description 5
- 238000004080 punching Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 239000003792 electrolyte Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000011257 shell material Substances 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 239000012785 packaging film Substances 0.000 description 2
- 229920006280 packaging film Polymers 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910001148 Al-Li alloy Inorganic materials 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- JFBZPFYRPYOZCQ-UHFFFAOYSA-N [Li].[Al] Chemical compound [Li].[Al] JFBZPFYRPYOZCQ-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000001989 lithium alloy Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000009517 secondary packaging Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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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
- H01M10/05—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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- 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
Abstract
The invention relates to the technical field of lithium batteries, and discloses a lithium ion battery for improving leakage failure of a soft package battery, which comprises a tab, a battery cell and an aluminum-plastic film coated outside the battery cell, wherein a top sealing area is arranged between the tab of the lithium battery and the aluminum-plastic film, the positive and negative tabs are respectively connected with the battery cell through positive and negative tab welding areas, the aluminum-plastic film top sealing area is provided with positive and negative tab airbags, and the positive and negative tab welding areas are respectively positioned in the positive and negative tab airbags. The positive and negative electrode tab air bags are respectively arranged in the top sealing area and are used for storing gas generated by chemical reaction of the lithium ion battery and reducing the peeling force of gas pressure in the battery on the electrode tab glue and the PP fusion layer, so that leakage in the packaging area in the service life cycle of the lithium ion battery is inhibited, poor insulation of the battery is reduced, and the cycle life and calendar life of the battery are prolonged; meanwhile, the physical space of the battery is saved, the arrangement of the lug is not influenced, and the available active space in the battery is provided to the maximum extent.
Description
Technical Field
The invention relates to the technical field of lithium batteries, in particular to a lithium ion battery capable of improving liquid leakage failure of a soft package battery and a packaging process thereof.
Background
The lithium ion battery shell is generally divided into a square shape, a cylindrical shape and a soft package, the soft package lithium ion battery has the advantages of large energy density, light weight, good safety performance, flexible design and the like compared with the square shape and the cylindrical shape, and is widely applied to the fields of mobile communication, energy storage, power and the like. The shell material of the soft package lithium ion battery is generally made of an aluminum plastic film composite material which is easy to form and process, the inner layer of the common aluminum plastic film is a PP layer, the middle layer of the common aluminum plastic film is an aluminum foil layer, and the outer layer of the common aluminum plastic film is a composite layer of PP or PET and nylon. In the manufacturing process of the lithium ion battery, the aluminum-plastic film is firstly punched into a concave single pit or a concave double pit, and then the battery core is placed into the concave pit. The battery core is generally of a laminated type or a winding type, foil materials respectively protruding on a positive pole piece and a negative pole piece are welded with a positive pole lug and a negative pole lug together through ultrasonic welding, then the lugs and an aluminum plastic film are hot-pressed, the lug glue and a PP layer are melted and hot-sealed, meanwhile, the single side part is hot-sealed, the other side is hot-sealed after the battery is injected with liquid, and finally, secondary packaging is carried out.
The soft package lithium ion battery is often in failure due to liquid leakage caused by the following reasons in the calendar life cycle:
(1) the packaging material is physically scratched, damaged and poorly insulated, and an aluminum layer of the aluminum-plastic film and lithium ions react chemically to generate an aluminum-lithium alloy;
(2) the battery is subjected to abuse such as overcharge and overdischarge, and gas generated by internal chemical reaction is expanded, torn and thermally sealed during normal use of the battery;
(3) electrolyte permeates into the tab glue and the tab bonding part and is stripped, and the tab leakage is caused under the combined action of chemical corrosion, electrochemical corrosion and gas generated by internal chemical reaction of the tab substrate;
(4) the packaging quality problems, such as excessive melting, bubbles, cracks and the like of the inner layer PP of the packaging area of the aluminum plastic film, particularly poor heat sealing strength and poor insulation caused by electrolyte adhesion of the inner layer of the aluminum plastic film during secondary edge sealing.
Leakage of the lithium ion battery can cause failure of the battery, and even safety accidents such as fire, explosion and the like can occur. Most of leakage of the soft package lithium ion power battery in the calendar life cycle occurs at the bonding position of the negative pole tab matrix and the tab glue.
Chinese patent application No. CN201611154701.6, published 2017, 03 and 08 discloses providing a pouch battery, which comprises a battery cell and a packaging film wrapped outside the battery cell, wherein the packaging film is formed with a battery cavity for accommodating the battery cell and at least one air bag, and the battery cavity is communicated with the air bag through an air hole. When the inside of the battery core generates gas due to abnormal chemical reaction, the gas can enter the air bag through the air hole, so that the gas expansion condition of the soft package battery under the conditions of overcharge, overdischarge, high temperature and the like can be effectively improved, and the safety performance and the cycle life of the battery are improved.
The gasbag that this patent set up is located one side or both sides of battery electricity core, has occupied a large amount of physical space, has increased the holistic physical volume of electricity core, and when the volume of battery is fixed, the inside available active space of battery reduces, and the battery performance descends.
Disclosure of Invention
In order to solve the technical problems, the invention provides the lithium ion battery for improving the leakage failure of the soft package battery and the packaging process thereof, wherein the tab glue is fully contacted with the tab matrix, so that the contact area of the tab and the PP layer on the inner layer of the aluminum-plastic film is ensured, the packaging strength of top sealing is effectively improved, the sealing performance of a battery cell is improved, the leakage time of the packaging part of the aluminum-plastic film is delayed, the poor insulation is reduced, the cycle performance is improved, and the calendar life is prolonged; just, set up anodal ear gasbag respectively between negative pole ear weld zone and the top seal district, the negative pole ear gasbag, the physical space that the battery occupy has been practiced thrift, do not influence the inside active space of battery and the setting of utmost point ear department, just, connect through the gasbag passageway between the negative pole ear gasbag, when lithium ion battery internally takes place chemical reaction and produces gas, gas can enter into anodal ear gasbag or negative pole ear gasbag, and the gas pressure through two gasbags of gasbag passageway balance, reduce the inside gaseous atmospheric pressure of battery and to the peeling strength of utmost point ear glue and PP fusion layer, restrain the weeping of lithium ion at the inherent encapsulation district of battery calendar life cycle, it is bad to reduce battery insulation, improve the security performance and the cycle life of battery.
The specific technical scheme of the invention is as follows: the utility model provides an improve lithium ion battery of laminate polymer battery weeping inefficacy, includes utmost point ear, electric core, and the cladding is at the outside plastic-aluminum membrane of electric core, its characterized in that: lithium ion battery's anodal ear and negative pole ear with be equipped with between the plastic-aluminum membrane and carry the district, just, the negative pole ear respectively through anodal ear weld zone, negative pole ear weld zone with the electricity core is connected, plastic-aluminum membrane carries the district to be equipped with anodal ear gasbag and negative pole ear gasbag, anodal ear weld zone is located anodal ear gasbag, negative pole ear weld zone is located the negative pole ear gasbag.
When gas is generated in the battery core due to chemical reaction, the gas can enter the air bag, so that the gas expansion condition of the soft package battery under the conditions of normal use or overcharge, overdischarge, high temperature and the like is effectively improved, the peeling force of the gas pressure in the battery on the lug glue and a PP fusion layer is reduced, the contact between electrolyte and an aluminum layer caused by microcrack generated on the PP layer is prevented, poor insulation is caused, meanwhile, the leakage of the battery in a packaging area is inhibited, and the safety performance and the cycle life of the battery are improved; in addition, the air bag is arranged between the aluminum plastic film top sealing area and the lug welding area, so that the physical space of the battery is effectively saved, the structural arrangement of the lug is not influenced, and a space with enough available activity is provided for the inside of the battery.
Preferably, the two sides and the bottom edge of the aluminum-plastic film are respectively provided with a side sealing area and a bottom sealing area.
Preferably, the top sealing area sealing width is 8-12mm, the side sealing and bottom sealing area sealing width is 5-7mm, and the heat sealing temperature is 150-170 ℃.
Preferably, the positive electrode tab air bag is connected with the negative electrode tab air bag through an air bag channel, and the height of the air bag channel is 2-8 mm.
When the positive and negative electrode lug air bags are connected through the air bag channel, gas generated by chemical reaction in the electric core enters the air bags, the air bag channel ensures that the gas pressure in the positive and negative electrode lug air bags is consistent with that in the electric core, the damage of the battery to an electrode lug welding area due to air expansion is reduced, the leakage of the battery in a packaging area is inhibited, and the poor insulation of the battery is reduced.
Preferably, the sections of the positive and negative electrode ear airbags are trapezoidal, the top edges are 45-60mm, the bottom edges are 57-80mm, the height is 5-8mm, the distance between the top edges of the airbags and the edge of the top sealing area is 5-7mm, and the positive and negative electrode ear airbags are of a single pit or double pit structure.
Preferably, the cross section of the positive and negative electrode ear airbags is rectangular, the long side is 55-80mm, the height is 5-8mm, the distance between the top edge of the airbag and the edge of the top sealing area is 5-7mm, and the positive and negative electrode ear airbags are of a single pit or double pit structure.
The length of the bottom edge of the trapezoidal structure of the air bag is greater than the length of the top edge, so that gas generated by chemical reaction inside the battery core can fully enter the air bag, the air bag plays a role in storing gas, the stripping force of gas pressure inside the battery on the lug glue and the PP fusion layer is reduced, and meanwhile, the length of the top edge of the air bag is shorter as far as possible on the premise of being greater than the width of the lug glue, so that the packaging strength of a top sealing area can be guaranteed.
Preferably, the 4 angles of the sections of the positive electrode lug air bags and the negative electrode lug air bags are R angles.
The 4 angles of the edge of the section of the air bag are set to be R angles, so that the stress concentration at the corner can be reduced, the boundary packaging part of the air bag and the top sealing area is not easy to tear, a better sealing effect is achieved, and the air bag is convenient to form and manufacture.
Preferably, the positive tab comprises a positive tab substrate and positive tab glue, and the negative tab comprises a negative tab substrate and negative tab glue.
Preferably, the tab glue exceeds the edge of the aluminum-plastic film top sealing area by 1-2mm, and exceeds the edge of the tab substrate by 1-2mm in the top sealing area.
A packaging process for packaging the lithium ion battery comprises the following steps:
step one, sequentially and crossly stacking a negative pole piece, a diaphragm and a positive pole piece to obtain a battery cell, respectively stacking tab foils of the positive pole piece and the negative pole piece together, and welding the tab foils with a tab to form a positive pole tab welding area and a negative pole tab welding area;
placing the battery core into an aluminum-plastic film wrapping material, wherein a top sealing area is arranged between the aluminum-plastic film and the tab, the packaging area is provided with a positive electrode tab air bag and a negative electrode tab air bag, and the positive electrode tab welding area and the negative electrode tab welding area are respectively positioned in the positive electrode tab air bag and the negative electrode tab air bag;
step three, performing side sealing and bottom sealing on the edge of the aluminum-plastic film to form a battery area and an air bag;
and step four, injecting liquid into the battery area, cutting off the air bag after the battery is subjected to soaking, pre-charging, primary evacuation, aging, secondary evacuation and rolling, and side sealing to cut off the edge, wherein the upper surface and the lower surface of the positive electrode lug air bag and the negative electrode lug air bag are attached at the moment, and the air bags are in a shrinkage shape.
Compared with the prior art, the invention has the beneficial effects that:
(1) the top sealing area is respectively provided with a positive electrode lug air bag and a negative electrode lug air bag, the positive electrode lug welding area and the negative electrode lug welding area are respectively positioned in the positive electrode lug air bag and the negative electrode lug air bag, the upper surface and the lower surface of the air bags are attached before the battery is used, the air bags are integrally in a shrinkage shape and used for storing gas generated by chemical reaction of the lithium ion battery, and the peeling force of gas pressure in the battery on a polar lug glue and a PP fusion layer is reduced, so that the leakage of lithium ions in the packaging area in the service life period of the battery is inhibited, the poor insulation of the battery is reduced, and the cycle life of the battery and the calendar life are prolonged;
(2) the arrangement position of the air bag saves the physical space of the battery, does not influence the arrangement of the pole lugs, and maximizes the available active space in the battery.
Drawings
FIG. 1 is a schematic structural view of examples 1 to 4 of the present invention;
FIG. 2 is a schematic view of a positive tab structure according to embodiment 1 of the present invention;
FIG. 3 is a cross-sectional side view of a negative electrode tab pouch according to examples 1-4 of the present invention;
FIG. 4 is a schematic structural diagram of a positive tab in embodiment 2 of the present invention;
FIG. 5 is a schematic structural diagram of a positive tab in embodiment 3 of the present invention;
FIG. 6 is a schematic structural diagram of a positive tab in embodiment 4 of the present invention;
fig. 7 is a schematic structural view of embodiment 5 of the present invention.
The reference signs are: the structure comprises a positive tab 1, a negative tab 2, a battery core 3, an aluminum plastic film 4, a top sealing area 5, a side sealing area 6, a bottom sealing area 7, a positive tab air bag 8, a negative tab air bag 9, an air bag channel 10, a positive tab base body 101, positive tab glue 102, a positive tab welding area 103, a negative tab base body 201, negative tab glue 202 and a negative tab welding area 203.
Detailed Description
In order to make the objects, technical solutions and advantageous technical effects of the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and the detailed description. The devices, connections, and methods referred to in this disclosure are those known in the art, unless otherwise indicated.
Example 1
As shown in fig. 1, 2 and 3: 1) stacking an electric core 3 of a laminated power battery with a 67Ah chemical system of NCM811/C with positive and negative pole piece tabs, prewelding, and welding the pole piece tabs and the tabs together by ultrasonic welding to form a tab welding area, wherein the distance from the tab welding area to a pole piece foil is 5mm, the positive tab 1 consists of a positive tab matrix 101 and positive tab glue 102, the negative tab 2 consists of a negative tab matrix 201 and negative tab glue 202, the tab glue exceeds the edge of a top sealing area 5 of an aluminum-plastic film 4 by 1.5mm, and exceeds the edge of the tab matrix in the top sealing area 5 by 1.5 mm;
2) placing an electric core 3 into a packaging material of an aluminum-plastic film 4, punching pits on two sides of the packaging material of the aluminum-plastic film 4 and forming an integral part of an air bag in a battery top sealing area 5, arranging an anode lug air bag 8 between the top sealing area 5 of the packaging material of the aluminum-plastic film 4 and an anode lug welding area 103, arranging a cathode lug air bag 9 between the top sealing area 5 of the packaging material of the aluminum-plastic film 4 and a cathode lug welding area 203, wherein the anode lug air bag and the cathode lug welding area are respectively positioned in the anode lug air bag and the cathode lug air bag, the sections of the anode lug air bag and the cathode lug air bag are in a trapezoidal structure, the width of the top side is 50mm, the width of the bottom side is 71mm, the height is 6mm, 4 corners are R corners, the distance between the top side of the air bag and the edge of the top sealing area 5 is 6mm, the air bag is in a double-pit structure formed by the upper surface and the lower surface of the aluminum-plastic film 4, the anode lug air bag 8 is connected with the cathode lug air bag 9 through an air bag channel 10, and the height of the air bag channel 10 is 2 mm;
3) the method comprises the following steps of thermally sealing the edge of an aluminum-plastic film 4 wrapping a battery core 3, wherein the thermal sealing temperature is 160 ℃, the thermal sealing area is divided into a top sealing area 5, a side sealing area 6 and a bottom sealing area 7, a side air bag is reserved during first sealing, the packaging width of the top sealing area 5 is 10mm, and the packaging width of the side sealing area 6 and the packaging width of the bottom sealing area 7 are 6 mm;
4) the reserved air bag is provided with a liquid injection port, liquid is injected into the battery from the liquid injection port, the air bag is cut off after the battery is subjected to the procedures of soaking, pre-charging, primary vacuumizing, aging, secondary vacuumizing, rolling and the like, secondary sealing is carried out, the air bag is contracted and packaged after primary vacuumizing and secondary vacuumizing in the manufacturing process of the battery, and the air bag swells after gas is generated due to chemical reaction in the service life cycle of the battery calendar.
Example 2
As shown in fig. 1, 3 and 4: 1) stacking an electric core 3 of a laminated power battery with a 67Ah chemical system of NCM811/C with positive and negative pole piece tabs, prewelding, and welding the pole piece tabs and the tabs together by ultrasonic welding to form a tab welding area, wherein the distance from the tab welding area to a pole piece foil is 5mm, the positive tab 1 consists of a positive tab matrix 101 and positive tab glue 102, the negative tab 2 consists of a negative tab matrix 201 and negative tab glue 202, the tab glue exceeds the edge of a top sealing area 5 of an aluminum-plastic film 4 by 1.5mm, and exceeds the edge of the tab matrix in the top sealing area 5 by 1.5 mm;
2) the cell 3 is put into the packaging material of the aluminum-plastic film 4, a pit is punched on the two sides of the packaging material of the aluminum-plastic film 4 and is integrally formed with the air bag in the battery top sealing area 5, the positive electrode tab air bag 8 is arranged between the top sealing area 5 of the packaging material of the aluminum-plastic film 4 and the positive electrode tab welding area 103, the negative electrode tab air bag 9 is arranged between the top sealing area 5 of the packaging material of the aluminum-plastic film 4 and the negative electrode tab welding area 203, the positive electrode tab welding area and the negative electrode tab welding area are respectively positioned in the positive electrode tab air bag and the negative electrode tab air bag, the sections of the positive electrode tab air bag and the negative electrode tab air bag are in a trapezoidal structure, the width of the top side is 50mm, the width of the bottom side is 71mm, the height is 6mm, the 4 corners are R corners, the distance between the top side of the air bag and the edge of the top sealing area 5 is 6mm, the air bag is in a double-pit structure formed by the upper surface and the lower surface of the aluminum-plastic film 4, the positive electrode tab air bag 8 is connected with the negative electrode tab air bag 9 through an air bag channel 10, the air bag channel 10 is 6mm in height, the two air bags are completely communicated, forming a large air bag with a trapezoidal section;
3) the method comprises the following steps of thermally sealing the edge of an aluminum-plastic film 4 wrapping a battery core 3, wherein the thermal sealing temperature is 160 ℃, the thermal sealing area is divided into a top sealing area 5, a side sealing area 6 and a bottom sealing area 7, a side air bag is reserved during first sealing, the packaging width of the top sealing area 5 is 10mm, and the packaging width of the side sealing area 6 and the packaging width of the bottom sealing area 7 are 6 mm;
4) the reserved air bag is provided with a liquid injection port, liquid is injected into the battery from the liquid injection port, the air bag is cut off after the battery is subjected to the procedures of soaking, pre-charging, primary vacuumizing, aging, secondary vacuumizing, rolling and the like, secondary sealing is carried out, the air bag is contracted and packaged after primary vacuumizing and secondary vacuumizing in the manufacturing process of the battery, and the air bag swells after gas is generated due to chemical reaction in the service life cycle of the battery calendar.
Example 3
As shown in fig. 1, 3 and 5: 1) stacking an electric core 3 of a laminated power battery with a 67Ah chemical system of NCM811/C with positive and negative pole piece tabs, prewelding, and welding the pole piece tabs and the tabs together by ultrasonic welding to form a tab welding area, wherein the distance from the tab welding area to a pole piece foil is 5mm, the positive tab 1 consists of a positive tab matrix 101 and positive tab glue 102, the negative tab 2 consists of a negative tab matrix 201 and negative tab glue 202, the tab glue exceeds the edge of a top sealing area 5 of an aluminum-plastic film 4 by 1.5mm, and exceeds the edge of the tab matrix in the top sealing area 5 by 1.5 mm;
2) the cell 3 is put into the packaging material of the aluminum-plastic film 4, the pits on the two sides of the packaging material of the aluminum-plastic film 4 and the air sac in the battery top sealing area 5 are integrally formed, the positive electrode tab air sac 8 is arranged between the top sealing area 5 of the packaging material of the aluminum-plastic film 4 and the positive electrode tab welding area 103, the negative electrode tab air sac 9 is arranged between the top sealing area 5 of the packaging material of the aluminum-plastic film 4 and the negative electrode tab welding area 203, the positive electrode tab welding area and the negative electrode tab welding area are respectively positioned in the positive electrode tab air sac and the negative electrode tab air sac respectively, the section of the negative electrode lug air bag is of a right-angled trapezoid structure, the width of the top edge is 55mm, the width of the bottom edge is 76mm, the height is 6mm, the 4 corners are R corners, the distance between the top edge of the air bag and the edge of the top sealing area is 6mm, one side of the positive electrode lug air bag and the negative electrode lug air bag, which is close to the side sealing area 6, is connected with the edge of the side sealing area 6, the air bag is of a double-pit structure formed by the upper surface and the lower surface of an aluminum plastic film 4, the positive electrode lug air bag 8 is connected with the negative electrode lug air bag 9 through an air bag channel 10, and the height of the air bag channel 10 is 2 mm;
3) the method comprises the following steps of thermally sealing the edge of an aluminum-plastic film 4 wrapping a battery core 3, wherein the thermal sealing temperature is 160 ℃, the thermal sealing area is divided into a top sealing area 5, a side sealing area 6 and a bottom sealing area 7, a side air bag is reserved during first sealing, the packaging width of the top sealing area 5 is 10mm, and the packaging width of the side sealing area 6 and the packaging width of the bottom sealing area 7 are 6 mm;
4) the reserved air bag is provided with a liquid injection port, liquid is injected into the battery from the liquid injection port, the air bag is cut off after the battery is subjected to the procedures of soaking, pre-charging, primary vacuumizing, aging, secondary vacuumizing, rolling and the like, secondary sealing is carried out, the air bag is contracted and packaged after primary vacuumizing and secondary vacuumizing in the manufacturing process of the battery, and the air bag swells after gas is generated due to chemical reaction in the service life cycle of the battery calendar.
Example 4
As shown in fig. 1, 3 and 6: 1) stacking an electric core 3 of a laminated power battery with a 67Ah chemical system of NCM811/C with positive and negative pole piece tabs, prewelding, and welding the pole piece tabs and the tabs together by ultrasonic welding to form a tab welding area, wherein the distance from the tab welding area to a pole piece foil is 5mm, the positive tab 1 consists of a positive tab matrix 101 and positive tab glue 102, the negative tab 2 consists of a negative tab matrix 201 and negative tab glue 202, the tab glue exceeds the edge of a top sealing area 5 of an aluminum-plastic film 4 by 1.5mm, and exceeds the edge of the tab matrix in the top sealing area 5 by 1.5 mm;
2) the battery core 3 is put into a packaging material of an aluminum-plastic film 4, a positive electrode lug air bag 8 is arranged between the packaging material double-sided punching pit of the aluminum-plastic film 4 and a positive electrode lug welding area 103, a negative electrode lug air bag 9 is arranged between the packaging material top sealing area 5 of the aluminum-plastic film 4 and a negative electrode lug welding area 203, the positive electrode lug welding area and the negative electrode lug welding area are respectively positioned in the positive electrode lug air bag and the negative electrode lug air bag, the sections of the positive electrode lug air bag and the negative electrode lug air bag are of rectangular structures, the width of a long side is 80mm, the height is 6mm, 4 angles are R angles, the top edge of the air bag is 6mm away from the edge of the top sealing area 5, the air bag is of a double-pit structure formed by the upper surface and the lower surface of the aluminum-plastic film 4, the punching pit depth of the air bag is shallower than the packaging material punching pit of a pole piece assembly, the shell positioning of the battery core is facilitated, the positive electrode lug air bag 8 is connected with the negative electrode lug air bag 9 through an air bag channel 10, and the air bag channel 10 is 6mm in height, the positive electrode lug air bag and the negative electrode lug air bag are consistent in height with the air bag channel 10, and the two air bags are completely communicated to form a large air bag with a rectangular section; (ii) a
3) The method comprises the following steps of thermally sealing the edge of an aluminum-plastic film 4 wrapping a battery core 3, wherein the thermal sealing temperature is 160 ℃, the thermal sealing area is divided into a top sealing area 5, a side sealing area 6 and a bottom sealing area 7, a side air bag is reserved during first sealing, the packaging width of the top sealing area 5 is 10mm, and the packaging width of the side sealing area 6 and the packaging width of the bottom sealing area 7 are 6 mm;
4) the reserved air bag is provided with a liquid injection port, liquid is injected into the battery from the liquid injection port, the air bag is cut off after the battery is subjected to the procedures of soaking, pre-charging, primary vacuumizing, aging, secondary vacuumizing, rolling and the like, secondary sealing is carried out, the air bag is contracted and packaged after primary vacuumizing and secondary vacuumizing in the manufacturing process of the battery, and the air bag swells after gas is generated due to chemical reaction in the service life cycle of the battery calendar.
Example 5
As shown in fig. 7: 1) stacking an electric core 3 of a laminated power battery with a 67Ah chemical system of NCM811/C and positive and negative pole piece tabs together, wherein the positive and negative pole pieces are respectively stacked at two opposite ends of the electric core, pre-welding is carried out, and the pole piece tabs and the tabs are welded together by ultrasonic welding to form a tab welding area, the distance from the tab welding area to a pole piece foil is 5mm, the positive tab 1 consists of a positive tab base body 101 and positive tab glue 102, the negative tab 2 consists of a negative tab base body 201 and negative tab glue 202, the positive and negative tab glue respectively exceeds the edges of a top sealing area 5 and a bottom sealing area 7 of an aluminum plastic film 4 by 1.5mm, and exceeds the edges of the tab base bodies in the top sealing area 5 and the bottom sealing area 7 by 1.5 mm;
2) placing an electric core 3 into a packaging material of an aluminum-plastic film 4, punching pits on two sides of the packaging material of the aluminum-plastic film 4, integrally forming air bags in a battery top sealing area 5 and a bottom sealing area 7, arranging an anode lug air bag 8 between the top sealing area 5 and an anode lug welding area 103 of the packaging material of the aluminum-plastic film 4, arranging a cathode lug air bag 9 between the bottom sealing area 7 and a cathode lug welding area 203 of the packaging material of the aluminum-plastic film 4, wherein the anode lug welding area and the cathode lug welding area are respectively positioned in the anode lug air bag and the cathode lug air bag, the sections of the anode lug air bag and the cathode lug air bag are of a trapezoidal structure, the width of the top side is 55mm, the width of the bottom side is 71mm, the height is 6mm, 4 corners are R corners, the distance between the anode lug air bag 8 and the edge of the top sealing area is 6mm, the distance between the top side of the cathode lug air bag 9 and the edge of the bottom sealing area is 6mm, and the air bags are of double-pit structures formed by the upper and lower surfaces of the aluminum-plastic film 4;
3) the method comprises the following steps of thermally sealing the edge of an aluminum-plastic film 4 wrapping a battery core 3, wherein the thermal sealing temperature is 160 ℃, the thermal sealing area is divided into a top sealing area 5, a side sealing area 6 and a bottom sealing area 7, a side air bag is reserved during first sealing, the sealing width of the top sealing area 5 and the bottom sealing area 7 is 10mm, and the sealing width of the side sealing area 6 is 6 mm;
4) the reserved air bag is provided with a liquid injection port, liquid is injected into the battery from the liquid injection port, the air bag is cut off after the battery is subjected to the procedures of soaking, pre-charging, primary vacuumizing, aging, secondary vacuumizing, rolling and the like, secondary sealing is carried out, the air bag is contracted and packaged after primary vacuumizing and secondary vacuumizing in the manufacturing process of the battery, and the air bag swells after gas is generated due to chemical reaction in the service life cycle of the battery calendar.
Comparative example 1
Comparative example 1 differs from example 1 in that: the top seal zone 5 was 6mm wide, the top seal zone 5 was not provided with the balloon and balloon channel 10, and the remaining raw materials and processes were the same as in example 1.
3 samples of example 1 and comparative example 1 were taken, respectively, fully charged with 4.25V and stored at 60 ℃, the remaining capacity and the recovery capacity were measured at normal temperature every 30 days, and after the measurement, fully charged and stored at 60 ℃ until a liquid leakage phenomenon was observed.
The test result shows that: all of the 3 samples of comparative example 1 leaked about 230 days, while the 3 samples of example 1 still did not leak the electrolyte after 500 days. The full contact area of the lug glue and the lug substrate ensures the contact area of the lug and the PP layer on the inner layer of the aluminum plastic film, so that the packaging strength of the top seal is improved, and the sealing performance of the battery cell is improved; in addition, set up anodal ear gasbag, negative pole ear gasbag respectively between just, negative pole ear welded area and the top seal district, just, connect through the gasbag passageway between the negative pole ear gasbag, when the inside chemical reaction that takes place of lithium ion battery produced gas, gas can enter into anodal ear gasbag or negative pole ear gasbag, and through the gas pressure of gasbag passageway balance two gasbags, reduce the peeling strength of the inside gas pressure of battery to anodal ear glue and PP fusion layer, inhibit the leakage of lithium ion in the encapsulation district of battery calendar life cycle, reduce the battery and insulate badly, practice thrift the physical space simultaneously, the setting of utmost point ear department is not influenced in the existence of gasbag.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still belong to the protection scope of the technical solution of the present invention.
Claims (10)
1. The utility model provides an improve lithium ion battery of laminate polymer battery weeping inefficacy, includes utmost point ear, electric core (3), and the cladding is at the outside plastic-aluminum membrane (4) of electric core, its characterized in that: lithium ion battery's anodal ear (1) and negative pole ear (2) with be equipped with between the plastic-aluminum membrane and carry seal district (5), just, the negative pole ear respectively through anodal ear weld zone (103), negative pole ear weld zone (203) with the electricity core is connected, plastic-aluminum membrane carries seal district and is equipped with anodal ear gasbag (8) and negative pole ear gasbag (9), anodal ear weld zone is located anodal ear gasbag, negative pole ear weld zone is located negative pole ear gasbag.
2. The lithium ion battery capable of improving the leakage failure of the soft package battery in claim 1, wherein the two sides and the bottom edge of the aluminum plastic film are respectively provided with a side sealing area (6) and a bottom sealing area (7).
3. The lithium ion battery for improving the leakage failure of the soft package battery as claimed in claim 2, wherein the top sealing region has a sealing width of 8-12mm, the side sealing region and the bottom sealing region have a sealing width of 5-7mm, and the heat sealing temperature is 150 ℃ and 170 ℃.
4. The lithium ion battery capable of improving the leakage failure of the soft package battery according to claim 1, wherein the positive electrode tab air bag and the negative electrode tab air bag are connected through an air bag channel (10), and the height of the air bag channel is 2-8 mm.
5. The lithium ion battery capable of improving the leakage failure of the soft package battery according to claim 4, wherein the positive and negative electrode ear airbags have trapezoidal cross-sectional shapes, the top edges are 45-60mm, the bottom edges are 57-80mm, the height is 5-8mm, the top edges of the airbags are 5-7mm away from the edge of the top sealing area, and the positive and negative electrode ear airbags are of a single pit or double pit structure.
6. The lithium ion battery capable of improving the leakage failure of the soft package battery according to claim 4, wherein the cross section of the positive and negative electrode tab air bags is rectangular, the long side is 55-80mm, the height is 5-8mm, the distance from the top edge of the air bag to the edge of the top sealing area is 5-7mm, and the positive and negative electrode tab air bags are of a single pit or double pit structure.
7. The lithium ion battery capable of improving the leakage failure of the soft package battery as claimed in claim 6, wherein the 4 angles of the sections of the positive and negative electrode lug air bags are R angles.
8. The lithium ion battery capable of improving the leakage failure of the soft package battery according to claim 1, wherein the positive tab comprises a positive tab substrate (101) and a positive tab glue (102), and the negative tab comprises a negative tab substrate (201) and a negative tab glue (202).
9. The lithium ion battery capable of improving the leakage failure of the soft package battery as claimed in claim 8, wherein the positive electrode tab glue and the negative electrode tab glue respectively exceed the edges of the top sealing area of the aluminum-plastic film by 1-2mm, and respectively exceed the edges of the positive electrode tab substrate and the negative electrode tab substrate by 1-2mm in the top sealing area.
10. A packaging process for packaging a lithium ion battery according to any of claims 1 to 9, comprising the steps of:
step one, sequentially and crossly stacking a negative pole piece, a diaphragm and a positive pole piece to obtain a battery cell, respectively stacking tab foils of the positive pole piece and the negative pole piece together, and welding the tab foils with a tab to form a positive pole tab welding area and a negative pole tab welding area;
placing the battery core into an aluminum-plastic film wrapping material, wherein a top sealing area is arranged between the aluminum-plastic film and the tab, the packaging area is provided with a positive electrode tab air bag and a negative electrode tab air bag, and the positive electrode tab welding area and the negative electrode tab welding area are respectively positioned in the positive electrode tab air bag and the negative electrode tab air bag;
step three, performing side sealing and bottom sealing on the edge of the aluminum-plastic film to form a battery area and an air bag;
and step four, injecting liquid into the battery area, cutting off the air bag after the battery is subjected to soaking, pre-charging, primary evacuation, aging, secondary evacuation and rolling, and side sealing to cut off the edge, wherein the upper surface and the lower surface of the positive electrode lug air bag and the negative electrode lug air bag are attached at the moment, and the air bags are in a shrinkage shape.
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Effective date of registration: 20211111 Address after: 311215 No. 855, Jianshe Second Road, economic and Technological Development Zone, Xiaoshan District, Hangzhou City, Zhejiang Province Applicant after: Wanxiang A123 Co.,Ltd. Address before: 311215 No. 855, Jianshe Second Road, Xiaoshan Economic and Technological Development Zone, Xiaoshan District, Hangzhou City, Zhejiang Province Applicant before: Wanxiang A123 Co.,Ltd. Applicant before: WANXIANG GROUP Co.,Ltd. |
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