CN113871803A - A cylindrical battery core using non-welding conductive connection and preparation method thereof - Google Patents
A cylindrical battery core using non-welding conductive connection and preparation method thereof Download PDFInfo
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- CN113871803A CN113871803A CN202111019711.XA CN202111019711A CN113871803A CN 113871803 A CN113871803 A CN 113871803A CN 202111019711 A CN202111019711 A CN 202111019711A CN 113871803 A CN113871803 A CN 113871803A
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- 238000003466 welding Methods 0.000 title claims abstract description 69
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 238000004804 winding Methods 0.000 claims abstract description 97
- 239000003292 glue Substances 0.000 claims abstract description 20
- 239000010410 layer Substances 0.000 claims description 129
- 239000000853 adhesive Substances 0.000 claims description 114
- 230000001070 adhesive effect Effects 0.000 claims description 114
- 239000000463 material Substances 0.000 claims description 42
- 239000012790 adhesive layer Substances 0.000 claims description 26
- 239000007774 positive electrode material Substances 0.000 claims description 26
- 239000007773 negative electrode material Substances 0.000 claims description 24
- 239000002184 metal Substances 0.000 claims description 23
- 229910052751 metal Inorganic materials 0.000 claims description 23
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- 238000000576 coating method Methods 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 19
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 16
- 239000011888 foil Substances 0.000 claims description 16
- 238000005096 rolling process Methods 0.000 claims description 15
- 239000004020 conductor Substances 0.000 claims description 11
- 238000004049 embossing Methods 0.000 claims description 8
- 239000006260 foam Substances 0.000 claims description 8
- 229910052759 nickel Inorganic materials 0.000 claims description 8
- 229910001220 stainless steel Inorganic materials 0.000 claims description 8
- 239000010935 stainless steel Substances 0.000 claims description 8
- 230000005611 electricity Effects 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 5
- 238000009413 insulation Methods 0.000 claims description 2
- 238000007711 solidification Methods 0.000 claims description 2
- 230000008023 solidification Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 16
- 238000012423 maintenance Methods 0.000 abstract description 11
- 230000007547 defect Effects 0.000 abstract 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 239000011149 active material Substances 0.000 description 6
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
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- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 description 3
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/514—Methods for interconnecting adjacent batteries or cells
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Secondary Cells (AREA)
Abstract
本发明涉及一种采用非焊接导电连接的圆柱电芯，包括上盖、壳体、卷芯和导电胶，容纳在壳体内的卷芯由负极片、正极片、第一隔膜和第二隔膜经过卷绕而成，负极片外漏于相邻隔膜的负极外漏集流体位于卷芯的一端，负极外漏集流体与相邻的壳体底部或极柱接触面通过导电胶电连接，正极片外漏于相邻隔膜的正极外漏集流体位于卷芯的另一端，正极外漏集流体与相邻的极柱接触面或壳体底部通过导电胶电连接，导电胶由位于同一层面的导电体和粘接体组成；本发明还涉及一种采用非焊接导电连接的圆柱电芯的制备方法；本发明具有在不影响电芯能量密度的前提下提高电芯安全能性能、改善电芯低压不良、缩减制作工序、降低设备采购维护成本，实现降本增效的优点。
The invention relates to a cylindrical battery core using non-welding conductive connection, comprising an upper cover, a casing, a winding core and a conductive glue. The winding core contained in the casing is passed through a negative electrode sheet, a positive electrode sheet, a first diaphragm and a second diaphragm It is wound, the negative electrode leakage current collector is located at one end of the winding core, and the negative electrode leakage current collector is electrically connected with the adjacent shell bottom or the contact surface of the pole through conductive glue, and the positive electrode is electrically connected. The positive leakage current collector that leaks to the adjacent diaphragm is located at the other end of the coil core. The positive leakage current collector is electrically connected to the contact surface of the adjacent pole column or the bottom of the shell through conductive glue. The invention also relates to a preparation method of a cylindrical battery core using non-welding conductive connection; the invention has the advantages of improving the safety performance of the battery core and improving the low voltage of the battery core without affecting the energy density of the battery core. Defects, reduce production processes, reduce equipment procurement and maintenance costs, and achieve the advantages of cost reduction and efficiency increase.
Description
Technical Field
The invention belongs to the technical field of batteries, and particularly relates to a cylindrical battery cell adopting non-welding conductive connection and a preparation method thereof.
Background
The traditional small cylindrical battery cell, the novel large cylindrical battery cell and the large cylindrical full-lug are kneaded to level the battery cell, the positive and negative lugs of the winding core are all led out of the shell or the shell from the inside of the shell in a welding mode to provide a current path for charging and discharging the battery cell, and the welding method comprises modes of resistance welding, ultrasonic welding, laser welding and the like; the resistance welding is suitable for welding various metals of the same kind or different kinds, the process is simple, the heating time is short, the welding deformation is small, but the equipment cost is high, the tensile strength and the fatigue strength of the welding position are low, the needle replacement is frequent, the welding area is limited by space, and potential safety hazards such as short circuit of a battery cell and the like are caused by welding spatter and ignition; the ultrasonic welding has good conductivity, low resistivity and low requirement on the surface of the welded metal, does not need scaling powder and gas protection, but generates a large amount of metal dust due to mechanical vibration, is difficult to clean from a battery cell, has relatively long welding time, influences takt time, is easy to generate insufficient welding, over welding and welding crack abnormity, and is not easy to manufacture a welding head; the laser welding is characterized in that metal materials are melted by heat energy generated by laser and then fused together, crystal grains are regenerated after cooling to connect two workpieces, the speed is high, the depth is large, the deformation is small, non-contact remote welding is realized, the flexibility is high, the laser welding energy conversion efficiency is low, protective gas is needed, the requirement on assembly precision is high, the welding temperature is high, welding slag splashes, and the welding risk of welding through exists when the lug and the shell are welded, so that the tightness of the battery cell is influenced; therefore, it is necessary to develop a cylindrical battery cell adopting non-welding conductive connection and a preparation method thereof, so that the safety performance of the battery cell is improved, the poor low voltage of the battery cell is improved, the manufacturing procedures are reduced, the equipment purchasing and maintenance cost is reduced, and the cost reduction and the efficiency improvement are realized on the premise of not influencing the energy density of the battery cell.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a cylindrical battery cell adopting non-welding conductive connection and a preparation method thereof, which can improve the safety performance of the battery cell, improve poor low voltage of the battery cell, reduce the manufacturing procedures, reduce the equipment purchasing and maintenance cost, and realize cost reduction and efficiency improvement.
The purpose of the invention is realized as follows: the utility model provides an adopt non-welding electrically conductive cylinder electricity core of connecting, it includes upper cover, casing, book core and conductive adhesive, holds in the casing roll up the core and form through convoluteing by negative pole piece, positive plate, first diaphragm and second diaphragm, the negative pole piece leaks outward that the mass flow is located the one end of rolling up the core in adjacent diaphragm's negative pole, the negative pole leaks outward that the mass flow is connected through conductive adhesive electricity with the utmost point post contact surface of adjacent casing bottom or upper cover, the positive plate leaks outward that the mass flow is located the other end of rolling up the core in adjacent diaphragm's positive pole, the anodal mass flow that leaks is connected through conductive adhesive electricity with adjacent utmost point post contact surface or casing bottom, conductive adhesive is constituteed by the electric conductor and the bonding body that are located same aspect.
The conductive adhesive is a conductive adhesive block which is prepared by conducting bodies and bonding bodies at intervals or a homogeneous conductive adhesive solution which is prepared by mixing the conducting bodies and the bonding bodies.
The bonding body of the conductive rubber block is respectively provided with bulges on two bonding surfaces which are contacted with the negative electrode leakage current collector and the positive electrode leakage current collector.
The negative pole piece includes the negative pole mass flow body and is located the negative material layer of negative pole mass flow body both sides, positive plate includes the positive current body and is located the positive material layer of positive current body both sides, the negative pole leaks the mass flow body outward and keeps away from the tip on negative material layer for the negative current body, the positive pole leaks the mass flow body outward and keeps away from the tip on positive material layer for the positive current body, the negative pole piece is coated on the side that is close to the diaphragm edge before coiling and is coated with the insulating glue layer with the edge parallel and level on the negative material layer, positive plate is coated on the side that is close to the diaphragm edge before coiling and is coated with the insulating glue layer with the edge parallel and level on the positive material layer.
The insulating glue layer is directly bonded on the side surface of the negative current collector and the side surface of the positive current collector.
The side of the negative current collector is adhered with an insulating layer adjacent to the negative material layer, the side of the positive current collector is adhered with an insulating layer adjacent to the positive material layer, and the insulating glue layer is adhered to the side of the insulating layer.
The material of negative pole mass flow body is metal foil, surface through coated metal foil, foam nickel or stainless steel, the material of anodal mass flow body is metal foil, surface through coated metal foil, foam nickel or stainless steel.
A method for preparing a cylindrical battery cell adopting non-welding conductive connection comprises the following steps:
step 1): roll the coating of negative pole material layer and press in the both sides of negative pole mass flow body, roll the coating of positive pole material layer and press in the both sides of the anodal mass flow body, form the negative pole piece and the positive plate that contact is inseparable, the bonding is firm:
step 2): before the negative plate and the positive plate are fed into a winding needle, the positions close to the edges of the diaphragms are respectively coated with an insulating glue layer, so that the insulating glue layers are convenient to be bonded and fixed with the adjacent diaphragms during winding, wherein the coated edges of the insulating glue layers are respectively flush with the edge of the negative material layer and the edge of the positive material layer;
step 3): winding the positive plate, the negative plate, the first diaphragm and the second diaphragm into a winding core by a winding machine, extending the negative outer leakage current collector and the positive outer leakage current collector out of the diaphragms by a certain length and locating at the upper and lower ends of the winding core, wherein the insulation adhesive layer at the lower end of the winding core extends out of the diaphragms by a certain length;
step 4): the conductive adhesive is bonded on the connecting surface of the outer leakage current collector positioned at the upper end of the winding core and the contact surface of the pole, the conductive adhesive is bonded on the connecting surface of the outer leakage current collector positioned at the lower end of the winding core and the bottom of the shell, the winding core is put into the shell and closed, and bonding is realized through solidification.
In the step 1), the side surface of the positive electrode sheet bonded with the positive electrode material layer is subjected to rolling embossing treatment.
In the step 1), while coating the negative electrode material layer, an insulating layer is adhered on the side surface of the negative electrode current collector, which is close to the negative electrode material layer, and while coating the positive electrode material layer, an insulating layer is adhered on the side surface of the positive electrode current collector, which is close to the positive electrode material layer.
The invention has the beneficial effects that: according to the cylindrical battery cell adopting the non-welding conductive connection and the preparation method thereof, the positive and negative current collectors of the winding core are all leaked out by a certain length through the optimization of the structure and are respectively and directly and electrically connected with the bottom of the shell and the pole, so that positive and negative pole-post assemblies are reduced, positive and negative current collecting pieces are eliminated, the production process is simplified, and the production cost is reduced; the invention adopts the bonding conductive adhesive to replace the tab welding mode, saves the welding procedure, not only solves the risks of influencing the safety of the battery cell, such as temperature rise, welding slag, welding penetration and the like in the welding process, but also reduces the purchase and maintenance cost of welding equipment; the conductive adhesive consists of the conductive body and the bonding body which are positioned on the same layer, has simple structure, high bonding efficiency and convenience, has good conductivity, bonding property and flexibility, and ensures that the positive and negative current collectors are firmly and reliably bonded with the bottom of the shell and the pole; the invention has the advantages of improving the safety performance of the battery cell, improving the poor low voltage of the battery cell, reducing the manufacturing procedure, reducing the equipment purchase and maintenance cost and realizing cost reduction and efficiency improvement on the premise of not influencing the energy density of the battery cell.
Drawings
FIG. 1 is a diagram of the connection structure of the conductive adhesive of the present invention with a roll core, an upper cover and a shell;
FIG. 2 is a schematic view of the core structure of the present invention;
FIG. 3 is a schematic structural diagram of a homogeneous conductive glue solution for electrical connection between a housing and an upper cover in example 1;
FIG. 4 is a schematic structural view of a prefabricated conductive adhesive block for electrically connecting the housing and the upper cover in embodiment 2;
FIG. 5 is a schematic structural diagram of a housing and an upper cover of embodiment 3, wherein the housing and the upper cover are electrically connected by a preformed conductive rubber block with protrusions;
fig. 6 is a structure view of a negative electrode sheet without an insulating layer of the negative outer drain current collector of examples 2 and 3;
FIG. 7 is a schematic diagram of the positive plate without an insulating layer of the positive outer drain current collector of examples 2 and 3;
fig. 8 is a structure of a negative electrode sheet with an insulating layer of a negative electrode outer leakage current collector of example 1;
FIG. 9 is a schematic view of the positive electrode sheet with an insulating layer of the positive electrode outer leakage current collector of example 1;
fig. 10 is a representation of a negative exposed current collector adherent insulating glue layer of the present invention;
fig. 11 is a representation of an anode exposed current collector adherent insulating glue layer of the present invention;
FIG. 12 is a view of the relative positions of the negative electrode sheet, the positive electrode sheet, the first separator and the second separator of the core portion of the winding core of the present invention;
fig. 13 is a diagram of the relative positions of the negative electrode sheet, the positive electrode sheet, the first separator and the second separator at the end of the winding core of example 1;
fig. 14 is a view showing a structure of a casing of the present invention.
In the figure, 100, an upper cover 110, a pole contact surface 200, a casing 210, a casing bottom 300, a winding core 301, a negative plate 302, a first diaphragm 303, a positive plate 304, a second diaphragm 310, a negative current collector 311, a negative material layer 320, a positive current collector 321, a positive material layer 330, an insulating layer 340, an insulating adhesive layer 351, a positive leakage current collector 352, a negative leakage current collector 400, a conductive adhesive 410, a conductor 411, a protrusion 412, a homogeneous conductive adhesive solution 420, an adhesive body 430, a casing conductive adhesive 440, a pole conductive adhesive L1, a feeding length L2, an excess length L3 and a set length are included.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
Example 1
As shown in fig. 1-2, a cylindrical battery cell using non-welding conductive connection includes an upper cover 100, a case 200, a winding core 300 and a conductive adhesive 400, the winding core 300 accommodated in the case 200 is formed by winding a negative electrode tab 301, a positive electrode tab 303, a first separator 302 and a second separator 304, the negative electrode tab 301 leaking outside the adjacent separator is located at one end of the winding core 300, the negative electrode leaking outside collector 352 is electrically connected with the adjacent case bottom 210 through the conductive adhesive 400, the positive electrode leaking outside collector 351 leaking outside the adjacent separator is located at the other end of the winding core 300, and the positive electrode leaking outside collector 351 is electrically connected with the adjacent electrode contact surface 110 through the conductive adhesive 400.
For better effect, the conductive adhesive 400 connected to the housing bottom 210 is a housing bottom conductive adhesive 430, the conductive adhesive 400 connected to the post contact surface 110 is a post conductive adhesive 440, the housing bottom conductive adhesive 430 and the post conductive adhesive 440 are a layer of homogeneous conductive adhesive 412 obtained by uniformly mixing the conductor 410 and the bonding body 420, the coating shape of the housing bottom conductive adhesive 430 is the same as the circular contact surface shape of the housing bottom 210, and the coating shape of the post conductive adhesive 440 corresponds to the shape of the post contact surface 110, as shown in fig. 3.
For better effect, the negative electrode tab 301 includes a negative electrode current collector 310 and negative electrode material layers 311 located on two sides of the negative electrode current collector 310, the positive electrode tab 303 includes a positive electrode current collector 320 and positive electrode material layers 321 located on two sides of the positive electrode current collector 320, the negative electrode outer leakage current collector 352 is an end portion of the negative electrode current collector 310 far away from the negative electrode material layers 311, the positive electrode outer leakage current collector 351 is an end portion of the positive electrode current collector 303 far away from the positive electrode material layers 321, the insulating layer 330 close to the negative electrode material layers 311 is adhered to a side surface of the negative electrode current collector 310, and the insulating layer 330 close to the positive electrode material layers 321 is adhered to a side surface of the positive electrode current collector 320, as shown in fig. 8-9, the insulating property of the periphery of the current collector can be improved.
As shown in fig. 10 to 11, the side of the negative electrode sheet 301 close to the edge of the separator before winding is coated with an insulating adhesive layer 340 flush with the edge of the negative electrode material layer 311, the side of the positive electrode sheet 303 close to the edge of the separator before winding is coated with an insulating adhesive layer 340 flush with the edge of the positive electrode material layer 321, and the insulating adhesive layer 340 is adhered to the side of the insulating layer 330.
For better effect, the negative electrode current collector 310 is made of metal foil, metal foil with a coated surface, nickel foam or stainless steel, and the positive electrode current collector 320 is made of metal foil, metal foil with a coated surface, nickel foam or stainless steel.
The preparation method of the cylindrical battery cell adopting the non-welding conductive connection in the embodiment comprises the following steps:
step 1): coating negative material layer 311 on the both sides of negative current collector 310 and rolling the compaction once or many times after drying, coating positive material layer 321 on the both sides of positive current collector 320 and rolling the compaction once or many times after drying, form contact inseparable, the firm negative pole piece 301 and positive plate 303 that bond:
coating an insulating layer 330 on the side surface of the negative electrode current collector 310, which is close to the negative electrode material layer 311, while coating the negative electrode material layer 311, and coating an insulating layer 330 on the side surface of the positive electrode current collector 320, which is close to the positive electrode material layer 321, while coating the positive electrode material layer 321, wherein the thickness of the insulating layer 300 is smaller than that of the electrode material, and the insulating layer 330 is composed of an insulating material such as Al2O3 or boehmite and a binder;
the side surface of the positive plate 303, which is bonded with the positive material layer 321, is subjected to rolling embossing treatment; preferably, spherical embossing is carried out, specifically, a roller is adopted for carrying out single-side surface rolling treatment, spherical protrusions are uniformly distributed on the surface of the roller, uniform spherical depressions exist on the surface of the rolled positive plate 303, the surface area of an electrode of the battery cell subjected to the embossing treatment is increased, more electrolyte can be stored between the electrodes, and the battery cell is favorable for internal resistance, multiplying power and cycle performance of the battery;
step 2): before the negative plate 301 and the positive plate 303 enter a winding needle, the positions close to the edges of the diaphragms are respectively coated with an insulating adhesive layer 340, the insulating adhesive layer 340 is adhered to the side surface of the insulating layer 330, and is convenient to be adhered and fixed with the adjacent diaphragms during winding, wherein the coated edges of the insulating adhesive layer 340 are respectively flush with the edge of the negative material layer 311 and the edge of the positive material layer 321, so that the uniformity of the thickness of the pole pieces is ensured;
step 3): as shown in fig. 12-13, the positive electrode sheet 303, the negative electrode sheet 301, the first separator 302 and the second separator 304 are wound into a winding core 300 by a winding machine, and the negative outer leakage current collector 352 and the positive outer leakage current collector 351 extend out of the separators by a certain length and are located at the upper end and the lower end of the winding core 300 to prepare for the electrical connection between the winding core 300 and the bottom 210 of the housing and the pole contact surface 110, wherein the insulating adhesive layer 340 of the negative outer leakage current collector 352 located at the lower end of the winding core 300 extends out of the separators by a certain length;
during specific winding, the first diaphragm 302 and the second diaphragm 304 are firstly wound into a winding needle for a certain length in an empty mode, then the negative plate 301 is wound into the winding needle, the negative plate 301 reaches the feeding length L1, then the positive plate 303 enters the winding needle, under the continuous rotation of the winding needle, the length of the positive plate 303 and the negative plate 303 reaches a set value and then is cut, the negative plate 301 at the cutting position exceeds the positive plate 303 by the length L2, and finally the first diaphragm 302 and the second diaphragm 304 are cut after being continuously wound to the set length L3;
step 4): as shown in fig. 1, 2 and 14, a conductive adhesive 400 is bonded to the connection surface between the positive electrode external leakage current collector 351 and the electrode post contact surface 110 at the upper end of the winding core 300, a conductive adhesive 400 is bonded to the contact surface between the negative electrode external leakage current collector 352 and the case bottom 210 at the lower end of the winding core 300, and the negative electrode exposed current collector 352 of the winding core 300 is inserted into the case and closed toward the case bottom 210 and is tightly bonded by curing such as pressurization and heating.
As shown in fig. 3, the conductive adhesive 400 connected to the housing bottom 210 is a housing bottom conductive adhesive 430, the conductive adhesive 400 connected to the post contact surface 110 is a post conductive adhesive 440, both the housing bottom conductive adhesive 430 and the post conductive adhesive 440 are a layer of homogeneous conductive adhesive 412 obtained by uniformly mixing a conductor 410 and a bonding body 420, and the electric connection between the current collector and the housing bottom 210 and the post contact surface 110 is realized by brushing, wherein the viscosity of the brushed housing bottom conductive adhesive 430 and the post conductive adhesive 440 is not less than 20000cps, the conductor 410 is one or a mixture of several of metal powder with low resistance, graphene and other carbon materials with excellent conductivity, and the bonding body 420 is a viscous liquid formed by mixing electrolyte corrosion resistant polymer materials such as epoxy resin, and the cell is completely cured when being baked with water at room temperature, and has excellent electrolyte resistance and aging resistance, the battery cell safety performance can be prevented from being influenced by the introduction of metal dust.
According to the cylindrical battery cell adopting the non-welding conductive connection and the preparation method thereof, the structure is optimized, positive and negative current collectors of the winding core 300 are all leaked out by a certain length and are respectively and directly and electrically connected with the bottom 210 of the shell and the pole, so that positive and negative pole assemblies are reduced, positive and negative current collectors are eliminated, the production process is simplified, and the production cost is reduced; the invention adopts the adhesive conductive adhesive 400 to replace the tab welding mode, saves the welding procedure, not only solves the risks of influencing the safety of the battery cell, such as temperature rise, welding slag, welding penetration and the like in the welding process, but also reduces the purchase and maintenance cost of welding equipment; the conductive adhesive 400 is composed of the conductive body 410 and the bonding body 420 which are positioned on the same layer, has simple structure, high bonding efficiency and convenience, and good conductivity, bonding property and flexibility, and ensures that the positive and negative current collectors are firmly and reliably bonded with the bottom 210 of the shell and the pole; the invention has the advantages of improving the safety performance of the battery cell, improving the poor low voltage of the battery cell, reducing the manufacturing procedure, reducing the equipment purchase and maintenance cost and realizing cost reduction and efficiency improvement on the premise of not influencing the energy density of the battery cell.
Example 2
As shown in fig. 1-2, a cylindrical battery cell using non-welding conductive connection includes an upper cover 100, a case 200, a winding core 300 and a conductive adhesive 400, the winding core 300 accommodated in the case 200 is formed by winding a negative electrode tab 301, a positive electrode tab 303, a first separator 302 and a second separator 304, the negative electrode tab 301 leaking outside the adjacent separator is located at one end of the winding core 300, the negative electrode leaking outside collector 352 is electrically connected with the adjacent pole contact surface 110 of the upper cover 100 through the conductive adhesive 400, the positive electrode leaking outside collector 351 leaking outside the adjacent separator is located at the other end of the winding core 300, and the positive electrode leaking outside collector 351 is electrically connected with the adjacent case bottom 210 through the conductive adhesive 400.
For better effect, the conductive adhesive 400 connected to the housing bottom 210 is a housing bottom conductive adhesive 430, the conductive adhesive 400 connected to the post contact surface 110 is a post conductive adhesive 440, the housing bottom conductive adhesive 430 and the post conductive adhesive 440 are conductive adhesive blocks prefabricated from the conductor 410 and the bonding body 420 on the same layer, the distribution shape of the housing bottom conductive adhesive 430 is the same as the circular contact surface of the housing bottom 210, and the distribution shape of the post conductive adhesive 440 corresponds to the shape of the post contact surface 110, as shown in fig. 4.
For better effect, the negative electrode tab 301 is composed of a negative electrode current collector 310 and a negative electrode material layer 311 located on two sides of the negative electrode current collector 310, the positive electrode tab 303 is composed of a positive electrode current collector 320 and a positive electrode material layer 321 located on two sides of the positive electrode current collector 320, the negative electrode external leakage current collector 352 is the end of the negative electrode current collector 310 far away from the negative electrode material layer 311, and the positive electrode external leakage current collector 351 is the end of the positive electrode current collector 303 far away from the positive electrode material layer 321, as shown in fig. 6-7.
As shown in fig. 10 to 11, the side of the negative electrode sheet 301 close to the edge of the separator before winding is coated with the insulating adhesive layer 340 flush with the edge of the negative electrode material layer 311, the side of the positive electrode sheet 303 close to the edge of the separator before winding is coated with the insulating adhesive layer 340 flush with the edge of the positive electrode material layer 321, and the insulating adhesive layer 340 is directly adhered to the side of the negative electrode current collector 310 and the side of the positive electrode current collector 320, so that the process is simple and the working efficiency is improved.
The negative electrode current collector 310 and the positive electrode current collector 320 are made of metal foil, metal foil with coated surfaces, nickel foam or stainless steel; the negative electrode material layer 311 and the positive electrode material layer 321 are composed of active materials, conductive agents and binders, wherein the active materials used by the positive electrode plate 303 are ternary materials, lithium iron phosphate, lithium manganate and other common positive electrode materials of the lithium ion battery, and the active materials used by the negative electrode plate 301 are graphite, carbon microspheres and other common negative electrode materials of the lithium ion battery; the insulating adhesive layer 340 is composed of PVDF, PEO and other epoxy resin binders and reinforcing agents, and can provide certain strength after being cured, so that the two ends of the battery cell can be conveniently electrically connected.
The preparation method of the cylindrical battery cell adopting the non-welding conductive connection in the embodiment comprises the following steps:
step 1): coating the negative electrode material layer 311 on the two sides of the negative electrode current collector 310, drying, and then rolling and compacting for one or more times, coating the positive electrode material layer 321 on the two sides of the positive electrode current collector 320, drying, and then rolling and compacting for one or more times, or pressing the prefabricated thin film positive and negative electrode material layers on the two side surfaces of the corresponding current collectors to form the negative electrode plate 301 and the positive electrode plate 303 which are in tight contact and firm in bonding:
the side surface of the positive plate 303, which is bonded with the positive material layer 321, is subjected to rolling embossing treatment; preferably, spherical embossing is carried out, specifically, a roller is adopted for carrying out single-side surface rolling treatment, spherical protrusions are uniformly distributed on the surface of the roller, uniform spherical depressions exist on the surface of the rolled positive plate 303, the surface area of an electrode of the battery cell subjected to the embossing treatment is increased, more electrolyte can be stored between the electrodes, and the battery cell is favorable for internal resistance, multiplying power and cycle performance of the battery;
step 2): before the negative plate 301 and the positive plate 303 enter a winding needle, the positions close to the edges of the diaphragms are respectively coated with an insulating adhesive layer 340, so that the insulating adhesive layers are convenient to bond and fix with the adjacent diaphragms during winding, wherein the coated edges of the insulating adhesive layers 340 are respectively flush with the edge of the negative material layer 311 and the edge of the positive material layer 321, and the thickness uniformity of the pole pieces is ensured;
step 3): as shown in fig. 12 and fig. 2, the positive electrode sheet 303, the negative electrode sheet 301, the first separator 302 and the second separator 304 are wound into a winding core 300 by a winding machine, and the negative electrode external leakage current collector 352 and the positive electrode external leakage current collector 351 extend out of the separators by a certain length and are located at the upper end and the lower end of the winding core 300 to prepare for the electrical connection of the winding core 300 with the bottom 210 of the case and the pole contact surface 110, wherein the insulating adhesive layer 340 of the positive electrode external leakage current collector 351 located at the lower end of the winding core 300 extends out of the separators by a certain length;
during specific winding, the first diaphragm 302 and the second diaphragm 304 are firstly wound into the winding needle for a certain length in an empty mode, then the negative plate 301 is wound into the winding needle, the negative plate 301 reaches the feeding length L1, then the positive plate 303 enters the winding needle, under the continuous rotation of the winding needle, the length of the positive plate 303 reaches a set value and then is cut, the negative plate 301 at the cutting position exceeds the positive plate 303 by the length L2, and finally the first diaphragm 302 and the second diaphragm 304 are continuously wound to the set length L3 and then cut.
Step 4): as shown in fig. 1, 2 and 14, a conductive adhesive 400 is bonded to a connection surface between the negative electrode external leakage current collector 352 and the electrode post contact surface 110 at the upper end of the winding core 300, a conductive adhesive 400 is bonded to a contact surface between the positive electrode external leakage current collector 351 and the bottom 210 of the case at the lower end of the winding core 300, and the positive electrode exposed current collector 351 of the winding core 300 is inserted into the case and closed toward the bottom 210 of the case, and is tightly bonded by curing means such as pressurization and heating.
As shown in fig. 4, the conductive adhesive 400 connected to the housing bottom 210 is a housing bottom conductive adhesive 430, the conductive adhesive 400 connected to the post contact surface 110 is a post conductive adhesive 440, both the housing bottom conductive adhesive 430 and the post conductive adhesive 440 are conductive adhesive blocks prefabricated by a conductor 410 and an adhesive body 420 on the same layer, and the current collector is electrically connected to the housing bottom 210 and the post contact surface 110 by an assembly method, wherein the conductor 410 is composed of a conductive agent such as metal powder, flake (graphene) or linear (carbon nanotube) with a high mass ratio and an electrolyte-resistant adhesive, and plays a role in electrical conduction; the adhesive body 420 is composed of an adhesive and an insulating material (AL2O3, boehmite, etc.), and plays roles of fixing, bonding, and deformation resistance.
According to the cylindrical battery cell adopting the non-welding conductive connection and the preparation method thereof, the structure is optimized, positive and negative current collectors of the winding core 300 are all leaked out by a certain length and are respectively and directly and electrically connected with the bottom 210 of the shell and the pole, so that positive and negative pole assemblies are reduced, positive and negative current collectors are eliminated, the production process is simplified, and the production cost is reduced; the invention adopts the adhesive conductive adhesive 400 to replace the tab welding mode, saves the welding procedure, not only solves the risks of influencing the safety of the battery cell, such as temperature rise, welding slag, welding penetration and the like in the welding process, but also reduces the purchase and maintenance cost of welding equipment; the conductive adhesive 400 is composed of the conductive body 410 and the bonding body 420 which are positioned on the same layer, has simple structure, high bonding efficiency and convenience, and good conductivity, bonding property and flexibility, and ensures that the positive and negative current collectors are firmly and reliably bonded with the bottom 210 of the shell and the pole; the invention has the advantages of improving the safety performance of the battery cell, improving the poor low voltage of the battery cell, reducing the manufacturing procedure, reducing the equipment purchase and maintenance cost and realizing cost reduction and efficiency improvement on the premise of not influencing the energy density of the battery cell.
Example 3
As shown in fig. 1-2, a cylindrical battery cell using non-welding conductive connection includes an upper cover 100, a case 200, a winding core 300 and a conductive adhesive 400, the winding core 300 accommodated in the case 200 is formed by winding a negative electrode tab 301, a positive electrode tab 303, a first separator 302 and a second separator 304, the negative electrode tab 301 leaking outside the adjacent separator is located at one end of the winding core 300, the negative electrode leaking outside collector 352 is electrically connected with the adjacent pole contact surface 110 of the upper cover 100 through the conductive adhesive 400, the positive electrode leaking outside collector 351 leaking outside the adjacent separator is located at the other end of the winding core 300, and the positive electrode leaking outside collector 351 is electrically connected with the adjacent case bottom 210 through the conductive adhesive 400.
For better effect, the conductive adhesive 400 connected to the bottom 210 of the case is a case bottom conductive adhesive 430, the conductive adhesive 400 connected to the contact surface 110 of the terminal is a terminal conductive adhesive 440, and the case bottom conductive adhesive 430 and the terminal conductive adhesive 440 are conductive adhesive blocks prepared by prefabricating a conductive body 410 and an adhesive body 420 on the same layer, wherein the adhesive body 420 of the conductive adhesive block is uniformly distributed with protrusions 411 on two adhesive surfaces of the negative outer leakage current collector 352 and the positive outer leakage current collector 351, respectively, so as to improve the adhesion firmness, as shown in fig. 5.
For better effect, the negative electrode tab 301 is composed of a negative electrode current collector 310 and a negative electrode material layer 311 located on two sides of the negative electrode current collector 310, the positive electrode tab 303 is composed of a positive electrode current collector 320 and a positive electrode material layer 321 located on two sides of the positive electrode current collector 320, the negative electrode external leakage current collector 352 is the end of the negative electrode current collector 310 far away from the negative electrode material layer 311, and the positive electrode external leakage current collector 351 is the end of the positive electrode current collector 303 far away from the positive electrode material layer 321, as shown in fig. 6-7.
As shown in fig. 10 to 11, the side of the negative electrode sheet 301 close to the edge of the separator before winding is coated with the insulating adhesive layer 340 flush with the edge of the negative electrode material layer 311, the side of the positive electrode sheet 303 close to the edge of the separator before winding is coated with the insulating adhesive layer 340 flush with the edge of the positive electrode material layer 321, and the insulating adhesive layer 340 is directly adhered to the side of the negative electrode current collector 310 and the side of the positive electrode current collector 320, so that the process is simple and the working efficiency is improved.
The negative electrode current collector 310 and the positive electrode current collector 320 are made of metal foil, metal foil with coated surfaces, nickel foam or stainless steel; the negative electrode material layer 311 and the positive electrode material layer 321 are composed of active materials, conductive agents and binders, wherein the active materials used by the positive electrode plate 303 are ternary materials, lithium iron phosphate, lithium manganate and other common positive electrode materials of the lithium ion battery, and the active materials used by the negative electrode plate 301 are graphite, carbon microspheres and other common negative electrode materials of the lithium ion battery; the insulating adhesive layer 340 is composed of PVDF, PEO and other epoxy resin binders and reinforcing agents, and can provide certain strength after being cured, so that the two ends of the battery cell can be conveniently electrically connected.
The preparation method of the cylindrical battery cell adopting the non-welding conductive connection in the embodiment comprises the following steps:
step 1): coating the negative electrode material layer 311 on the two sides of the negative electrode current collector 310, drying, and then rolling and compacting for one or more times, coating the positive electrode material layer 321 on the two sides of the positive electrode current collector 320, drying, and then rolling and compacting for one or more times, or pressing the prefabricated thin film positive and negative electrode material layers on the two side surfaces of the corresponding current collectors to form the negative electrode plate 301 and the positive electrode plate 303 which are in tight contact and firm in bonding:
step 2): before the negative plate 301 and the positive plate 303 enter a winding needle, the positions close to the edges of the diaphragms are respectively coated with an insulating adhesive layer 340, so that the insulating adhesive layers are convenient to bond and fix with the adjacent diaphragms during winding, wherein the coated edges of the insulating adhesive layers 340 are respectively flush with the edge of the negative material layer 311 and the edge of the positive material layer 321, and the thickness uniformity of the pole pieces is ensured;
step 3): as shown in fig. 12 and fig. 2, the positive electrode sheet 303, the negative electrode sheet 301, the first separator 302 and the second separator 304 are wound into a winding core 300 by a winding machine, and the negative electrode external leakage current collector 352 and the positive electrode external leakage current collector 351 extend out of the separators by a certain length and are located at the upper end and the lower end of the winding core 300 to prepare for the electrical connection of the winding core 300 with the bottom 210 of the case and the pole contact surface 110, wherein the insulating adhesive layer 340 of the positive electrode external leakage current collector 351 located at the lower end of the winding core 300 extends out of the separators by a certain length;
during specific winding, the first diaphragm 302 and the second diaphragm 304 are firstly wound into the winding needle for a certain length in an empty mode, then the negative plate 301 is wound into the winding needle, the negative plate 301 reaches the feeding length L1, then the positive plate 303 enters the winding needle, under the continuous rotation of the winding needle, the length of the positive plate 303 reaches a set value and then is cut, the negative plate 301 at the cutting position exceeds the positive plate 303 by the length L2, and finally the first diaphragm 302 and the second diaphragm 304 are continuously wound to the set length L3 and then cut.
Step 4): as shown in fig. 1, 2 and 14, a conductive adhesive is bonded to the connection surface between the negative outer leakage current collector 352 at the upper end of the winding core 300 and the electrode post contact surface 110, a conductive adhesive 400 is bonded to the contact surface between the positive outer leakage current collector 351 at the lower end of the winding core 300 and the bottom 210 of the case, and the positive outer leakage current collector 351 of the winding core 300 is inserted into the case and closed toward the bottom 210 of the case, and is tightly bonded by curing means such as pressurization and heating.
As shown in fig. 5, the conductive adhesive 400 connected to the housing bottom 210 is a housing bottom conductive adhesive 430, the conductive adhesive 400 connected to the post contact surface 110 is a post conductive adhesive 440, both the housing bottom conductive adhesive 430 and the post conductive adhesive 440 are conductive adhesive blocks prefabricated by a conductor 410 and an adhesive body 420 on the same layer, and the current collector is electrically connected to the housing bottom 210 and the post contact surface 110 by an assembly method, wherein the conductor 410 is composed of a conductive agent such as metal powder, flake (graphene) or linear (carbon nanotube) with a high mass ratio and an electrolyte-resistant adhesive, and plays a role in electrical conduction; the adhesive body 420 is composed of an adhesive and an insulating material (AL2O3, boehmite, etc.), and plays roles of fixing, bonding, and deformation resistance.
For better effect, sharp and soft protrusions 411 are uniformly distributed on two bonding surfaces of the bonding body 420 of the conductive adhesive block, which are respectively in contact with the negative electrode leakage current collector 352 and the positive electrode leakage current collector 351, and when the conductive adhesive block is connected with the negative electrode leakage current collector and the positive electrode leakage current collector by heating and pressurizing, the protrusions 411 enable the conductive adhesive 400 to be firmly bonded with the positive electrode and negative electrode exposed current collectors.
According to the cylindrical battery cell adopting the non-welding conductive connection and the preparation method thereof, the structure is optimized, positive and negative current collectors of the winding core 300 are all leaked out by a certain length and are respectively and directly and electrically connected with the bottom 210 of the shell and the pole, so that positive and negative pole assemblies are reduced, positive and negative current collectors are eliminated, the production process is simplified, and the production cost is reduced; the invention adopts the adhesive conductive adhesive 400 to replace the tab welding mode, saves the welding procedure, not only solves the risks of influencing the safety of the battery cell, such as temperature rise, welding slag, welding penetration and the like in the welding process, but also reduces the purchase and maintenance cost of welding equipment; the conductive adhesive 400 is composed of the conductive body 410 and the bonding body 420 which are positioned on the same layer, has simple structure, high bonding efficiency and convenience, and good conductivity, bonding property and flexibility, and ensures that the positive and negative current collectors are firmly and reliably bonded with the bottom 210 of the shell and the pole; the invention has the advantages of improving the safety performance of the battery cell, improving the poor low voltage of the battery cell, reducing the manufacturing procedure, reducing the equipment purchase and maintenance cost and realizing cost reduction and efficiency improvement on the premise of not influencing the energy density of the battery cell.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. The utility model provides an adopt cylinder electricity core of non-welding electrically conductive connection which characterized in that: it includes upper cover, casing, book core and conductive adhesive, holds in the casing roll up the core and form through convoluteing by negative pole piece, positive plate, first diaphragm and second diaphragm, the negative pole piece leaks outward in the negative pole of adjacent diaphragm and leaks the mass flow body and be located the one end of rolling up the core, the negative pole leaks outward the mass flow body and is connected through the conductive adhesive electricity with the utmost point post contact surface of adjacent casing bottom or upper cover, the positive plate leaks outward the other end that the mass flow body is located the book core in the positive pole of adjacent diaphragm, the anodal mass flow body that leaks outward is connected through the conductive adhesive electricity with adjacent utmost point post contact surface or casing bottom, the conductive adhesive comprises the electric conductor and the bonding body that are located same aspect.
2. The cylindrical cell with the non-welded conductive connection according to claim 1, wherein: the conductive adhesive is a conductive adhesive block which is prepared by conducting bodies and bonding bodies at intervals or a homogeneous conductive adhesive solution which is prepared by mixing the conducting bodies and the bonding bodies.
3. The cylindrical cell with the non-welded conductive connection according to claim 2, wherein: the bonding body of the conductive rubber block is respectively provided with bulges on two bonding surfaces which are contacted with the negative electrode leakage current collector and the positive electrode leakage current collector.
4. The cylindrical cell with the non-welded conductive connection according to claim 1, wherein: the negative pole piece includes the negative pole mass flow body and is located the negative material layer of negative pole mass flow body both sides, positive plate includes the positive current body and is located the positive material layer of positive current body both sides, the negative pole leaks the mass flow body outward and keeps away from the tip on negative material layer for the negative current body, the positive pole leaks the mass flow body outward and keeps away from the tip on positive material layer for the positive current body, the negative pole piece is coated on the side that is close to the diaphragm edge before coiling and is coated with the insulating glue layer with the edge parallel and level on the negative material layer, positive plate is coated on the side that is close to the diaphragm edge before coiling and is coated with the insulating glue layer with the edge parallel and level on the positive material layer.
5. The cylindrical cell with the non-welded conductive connection according to claim 4, wherein: the insulating glue layer is directly bonded on the side surface of the negative current collector and the side surface of the positive current collector.
6. The cylindrical cell with the non-welded conductive connection according to claim 4, wherein: the side of the negative current collector is adhered with an insulating layer adjacent to the negative material layer, the side of the positive current collector is adhered with an insulating layer adjacent to the positive material layer, and the insulating glue layer is adhered to the side of the insulating layer.
7. The cylindrical cell with the non-welded conductive connection according to claim 1, wherein: the material of negative pole mass flow body is metal foil, surface through coated metal foil, foam nickel or stainless steel, the material of anodal mass flow body is metal foil, surface through coated metal foil, foam nickel or stainless steel.
8. A preparation method of a cylindrical battery cell adopting non-welding conductive connection is characterized by comprising the following steps: it comprises the following steps:
step 1): roll the coating of negative pole material layer and press in the both sides of negative pole mass flow body, roll the coating of positive pole material layer and press in the both sides of the anodal mass flow body, form the negative pole piece and the positive plate that contact is inseparable, the bonding is firm:
step 2): before the negative plate and the positive plate are fed into a winding needle, the positions close to the edges of the diaphragms are respectively coated with an insulating glue layer, so that the insulating glue layers are convenient to be bonded and fixed with the adjacent diaphragms during winding, wherein the coated edges of the insulating glue layers are respectively flush with the edge of the negative material layer and the edge of the positive material layer;
step 3): winding the positive plate, the negative plate, the first diaphragm and the second diaphragm into a winding core by a winding machine, extending the negative outer leakage current collector and the positive outer leakage current collector out of the diaphragms by a certain length and locating at the upper and lower ends of the winding core, wherein the insulation adhesive layer at the lower end of the winding core extends out of the diaphragms by a certain length;
step 4): the conductive adhesive is bonded on the connecting surface of the outer leakage current collector positioned at the upper end of the winding core and the contact surface of the pole, the conductive adhesive is bonded on the connecting surface of the outer leakage current collector positioned at the lower end of the winding core and the bottom of the shell, the winding core is put into the shell and closed, and bonding is realized through solidification.
9. The method of claim 8, wherein the method comprises the following steps: in the step 1), the side surface of the positive electrode sheet bonded with the positive electrode material layer is subjected to rolling embossing treatment.
10. The method of claim 8, wherein the method comprises the following steps: in the step 1), while coating the negative electrode material layer, an insulating layer is adhered on the side surface of the negative electrode current collector, which is close to the negative electrode material layer, and while coating the positive electrode material layer, an insulating layer is adhered on the side surface of the positive electrode current collector, which is close to the positive electrode material layer.
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Application publication date: 20211231 |
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