CN107732287B - Cylindrical lithium ion battery - Google Patents
Cylindrical lithium ion battery Download PDFInfo
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- CN107732287B CN107732287B CN201710470722.7A CN201710470722A CN107732287B CN 107732287 B CN107732287 B CN 107732287B CN 201710470722 A CN201710470722 A CN 201710470722A CN 107732287 B CN107732287 B CN 107732287B
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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 provides a cylindrical lithium ion battery, which comprises a steel shell and a coil sleeved in the steel shellThe core is formed by winding a positive plate, a negative plate and a diaphragm, the outmost layer of the winding core is a negative plate copper foil, a conductive swelling adhesive is filled between the winding core and the steel shell, the negative plate copper foil is electrically connected with the steel shell through the conductive swelling adhesive, the volume expansion rate of the conductive swelling adhesive after being soaked in electrolyte at 25 ℃ for 24 hours is more than or equal to 100%, and the conductivity of the conductive swelling adhesive is more than or equal to 104S/m。
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a cylindrical lithium ion battery.
Background
The lithium ion battery has the characteristics of high voltage, light weight, high energy density, long service life, low self-discharge and no memory effect in use, and is widely applied to various aspects such as energy storage, electromotion and the like at present. At present, a cylindrical lithium ion battery is prepared by winding a positive and negative pole piece after being made into a sheet and a diaphragm and then putting the sheet and the diaphragm into a shell. Generally, in order to prevent the loose of the winding core from affecting the performance of the battery (but the loosening of the winding core cannot be guaranteed), the cylindrical lithium ion battery is wound outside the surface of the outer-layer diaphragm by using insulating adhesive paper after the positive plate, the diaphragm and the negative plate are wound, so as to form the winding core. The cylindrical lithium ion battery with the structure has the advantages that the internal anode is communicated with the external anode through the anode tab, and the internal cathode is communicated with the external cathode through the cathode tab. The conventional negative electrode lug material such as nickel has large resistivity, so that the internal resistance of the cylindrical lithium ion battery is large, and the large-current discharge of the cylindrical lithium ion battery is limited. In addition, for the power battery, the consistency is very important, and the problems of grouping, PACK and subsequent use are various. The insulating gummed paper is wound into the winding core, so that the structure can be prevented from being loosened to a certain extent, but the phenomena of battery core loosening or separation of a welding part and the like easily occur in the battery along with the long-time vibration and jolt of the electric automobile in the use of the power battery.
Disclosure of Invention
The invention aims to provide a cylindrical lithium ion battery, and aims to solve the problems of large internal resistance, poor consistency and insufficient anti-seismic fixed energy of the conventional cylindrical lithium ion battery formed by winding insulating gummed paper.
The cylindrical lithium ion battery comprises a steel shell and a roll core sleeved in the steel shell, wherein the roll core is formed by winding a positive plate, a negative plate and a diaphragm, the outmost layer of the roll core is a negative plate copper foil, a conductive swelling adhesive is filled between the roll core and the steel shell, the negative plate copper foil is electrically connected with the steel shell through the conductive swelling adhesive, the volume expansion rate of the conductive swelling adhesive after being soaked in an electrolyte at 25 ℃ for 24 hours is more than or equal to 100%, and the conductivity of the conductive swelling adhesive is more than or equal to 10%4S/m。
Furthermore, the conductive swelling glue consists of a substrate layer and an adhesive layer attached to the substrate layer, the adhesive layer consists of a swelling component and a conductive component, and the adhesive layer is bonded to the negative plate copper foil.
Further, the swelling component is at least one of polyurethane acrylate, epoxy acrylate and polyester acrylate.
Further, the conductive component is at least one of an organic conductive component, metal powder and graphite powder.
Further, the organic conductive component comprises epoxy resin, organic silicon resin, polyimide resin, phenolic resin, polyurethane and acrylic resin, and the metal powder comprises copper, aluminum, iron, nickel, zinc, silver and gold.
Furthermore, the cylindrical lithium ion battery further comprises a negative electrode tab, one end of the negative electrode tab is arranged between the negative electrode sheet copper foil and the conductive swelling glue, and the other end of the negative electrode tab is electrically connected with a negative electrode outside the battery.
Further, the substrate layer comprises at least one of copper foil and aluminum foil.
Further, the thickness of the base material layer is less than or equal to 60 mu m.
Furthermore, the thickness of the adhesive layer is less than or equal to 100 mu m.
Further, the adhesive layer is composed of polyurethane acrylate, epoxy resin and graphite powder in a mass ratio of 0.5:0.15: 0.35.
According to the cylindrical lithium ion battery provided by the invention, the conductive swelling glue is filled between the copper foil of the negative plate and the steel shell. The conductive swelling glue has good swelling performance, so that the winding core can be effectively coated, and the winding core is not loose; and the conductive swelling glue has a swelling function in the electrolyte, so that the roll core is tightly attached to the external steel shell, the roll core is prevented from loosening, the consistency of the cylindrical lithium ion battery is improved, and the vibration resistance of the battery is improved. Even under the condition of long-time vibration and bump, the cylindrical lithium ion battery obtained by the method is not easy to generate phenomena such as cell loosening or separation of a welding part in the battery. Meanwhile, the cylindrical lithium ion battery provided by the invention omits a diaphragm on the outermost negative plate, and the conductive swelling adhesive has conductive performance and is tightly combined with the steel shell, so that the negative plate can be electrically communicated with the external steel shell through the conductive swelling adhesive, thereby increasing an electronic channel, effectively reducing the internal resistance of the battery and enhancing the rate capability. In addition, because the diaphragm on the outer layer of the negative pole piece is omitted, the redundant space in the cylindrical lithium ion battery can be used for prolonging the lengths of the positive pole piece and the negative pole piece, and the capacity of the battery can be improved.
Drawings
Fig. 1 is a schematic structural diagram of a longitudinal section of a cylindrical lithium ion battery structure provided in an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a conductive swelling glue according to an embodiment of the present invention;
FIG. 3 is a graph of individual values of the internal resistance of the cell before the test provided in example 1 of the present invention and comparative example 1;
FIG. 4 is a graph of individual values of the internal resistance of the battery after vibration, provided in example 1 of the present invention and comparative example 1;
FIG. 5 is a single-valued graph of internal resistance change after the drum test provided in example 1 of the present invention and comparative example 1;
fig. 6 is a graph of the results of the rate discharge test provided in example 1 of the present invention and comparative example 1.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
With reference to fig. 1 and 2, an embodiment of the present invention provides a cylindrical lithium ion battery, including a steel case and a winding core sleeved in the steel case, where the winding core is formed by winding a positive plate, a negative plate, and a separator, the outermost layer of the winding core is a negative plate copper foil, a conductive swelling adhesive is filled between the winding core and the steel case, and the negative plate copper foil is electrically connected to the steel case through the conductive swelling adhesive, where the conductive swelling adhesive has a volume expansion rate of not less than 100% when immersed in an electrolyte at 25 ℃ for 24 hours, and the conductivity of the conductive swelling adhesive is not less than 10 ≥ that of the conductive swelling adhesive4S/m。
The embodiment of the invention directly adopts the conductive swelling glue to terminate on the copper foil of the negative plate and then puts the copper foil into the steel shell, which is different from the conventional cylindrical lithium ion battery (the insulation glue is wrapped on the outermost layer of the winding core, namely the surface of the diaphragm outside the copper foil of the negative plate, and then the winding core is put into the steel shell). The conductive swelling glue has good swelling performance (the volume expansion rate of the conductive swelling glue soaked in the electrolyte at 25 ℃ for 24 hours is more than or equal to 100 percent), so that the conductive swelling glue can effectively coat the winding core and ensure that the winding core is not loose; and the conductive swelling glue has a swelling function in the electrolyte, so that the roll core is tightly attached to the external steel shell, the roll core is prevented from loosening, the consistency of the cylindrical lithium ion battery is improved, and the vibration resistance of the battery is improved. The cylindrical lithium ion battery obtained by the method has the advantages that the phenomena of cell looseness, separation of welding parts and the like are not easy to occur in the battery even under the conditions of long-time vibration and bump. Meanwhile, the cylindrical lithium ion battery provided by the invention omits a diaphragm on the cathode plate at the outermost layer, and the conductive swelling adhesive has conductive performance (the conductivity is more than or equal to 10)4S/m) and is tightly combined with the steel shell, so that the negative plate can be electrically communicated with the external steel shell through the conductive swelling glue, and the electron flux is increasedTherefore, the internal resistance of the battery is effectively reduced, and the rate capability is enhanced. In addition, because the diaphragm on the outer layer of the negative pole piece is omitted, the redundant space in the cylindrical lithium ion battery can be used for prolonging the lengths of the positive pole piece and the negative pole piece, and the capacity of the battery can be improved.
Specifically, in the embodiment of the present invention, the cylindrical lithium ion battery further includes a negative electrode tab, one end of the negative electrode tab is disposed between the negative electrode sheet copper foil and the conductive swelling glue, and the other end of the negative electrode tab is electrically connected to an external negative electrode of the battery, so that the conductive connection between the negative electrode sheet and the external negative electrode (not shown in the figure) is realized on the premise of ensuring the electrical connection between the negative electrode sheet and the external steel shell. One end of the negative plate tab can be electrically connected with the negative plate copper foil through welding; the other end of the negative electrode tab can be electrically connected with the external negative electrode (namely the bottom of the steel shell) of the battery through welding.
Preferably, as shown in fig. 2, the conductive swelling glue is composed of a substrate layer and an adhesive layer attached to the substrate layer, the adhesive layer is composed of a swelling component and a conductive component, and the adhesive layer is bonded to the copper foil of the negative electrode sheet. The swelling component can expand in volume in the presence of electrolyte, so that the swelling component can be effectively filled between the outer-layer negative plate and the outer steel shell, the consistency and the shock resistance of the battery are improved, and the conductive connection between the negative plate and the steel shell can be better ensured.
Specifically, in the embodiment of the invention, the substrate layer is used as a substrate layer for loading the adhesive layer, and in order to realize conductive communication, the substrate layer is made of a conductive material, so that the conductive connection between the negative electrode plate and the steel shell is ensured. Specifically, the substrate layer may be at least one of a copper foil and an aluminum foil having high conductivity. More preferably, the thickness of the substrate layer is less than or equal to 60 μm. If the thickness of substrate layer is too thick, then can influence the roll core and go into the shell.
Specifically, the adhesive layer has both swelling performance and conductive performance. Further preferably, the swelling component is at least one of urethane acrylate, epoxy acrylate, and polyester acrylate. The preferable swelling component has a proper volume expansion rate in the lithium ion electrolyte, so that the consistency rate of the battery can be ensured, and the shock resistance is improved; meanwhile, the preferable swelling component also has a certain conductive function, and after being compounded with the conductive component, the conductivity of the conductive swelling adhesive can be better improved, so that the internal resistance of the battery is reduced.
Further, the conductive component is at least one of an organic conductive component, metal powder and graphite powder. Preferably, the organic conductive component comprises epoxy resin, silicone resin, polyimide resin, phenolic resin, polyurethane and acrylic resin, and the metal powder comprises copper, aluminum, iron, nickel, zinc, silver and gold. The preferred combination can ensure better adhesive paper viscosity and has stronger conductivity. In the embodiment of the present invention, the conductive component may be used alone or in combination of a plurality of types. When a plurality of combinations are used, the same type of conductive components may be combined, or different types of conductive components may be combined. Preferably, the conductive component is a combined conductive agent of an organic conductive component, metal powder and/or graphite powder. The optimal combination mode has better conductive effect and more stable conductive performance, and is beneficial to improving the consistency of the battery.
As a specific preferred embodiment, the adhesive layer is composed of urethane acrylate, epoxy resin and graphite powder in a mass ratio of 0.5:0.15: 0.35. The preferable adhesive layer with the specific swelling component and the conductive component can obviously improve the consistency of the battery, improve the shock resistance and effectively reduce the internal resistance of the battery. Of course, this is only one specific embodiment of the present invention, and the selection and combination of the swelling component and the conductive component in the adhesive layer is obviously not limited thereto, and may be selected from the above-mentioned preferred swelling component and conductive component according to the specific electrolyte of the lithium ion battery.
In the embodiment of the invention, the thickness of the adhesive layer is preferably less than or equal to 100 μm. The thickness can ensure that the winding core is not too thick to influence the battery to enter the shell, the viscosity and the conductivity of the adhesive paper can be ensured, and the swelling property of the battery in the electrolyte can be considered at the same time. More preferably, the thickness of the adhesive layer is less than or equal to 90 μm.
After the cylindrical lithium ion battery is placed into a shell, the cylindrical lithium ion battery is manufactured into a finished battery through the processes of bottom welding, groove rolling, baking, liquid injection, sealing and formation. According to the cylindrical lithium ion battery provided by the embodiment of the invention, after liquid injection, volume expansion can be generated by adopting the conductive swelling glue, so that a roll core is ensured not to be loosened.
According to the cylindrical lithium ion battery provided by the embodiment of the invention, the conductive swelling glue is filled between the copper foil of the negative plate and the steel shell. The conductive swelling glue has good swelling performance, so that the winding core can be effectively coated, and the winding core is not loose; and the conductive swelling glue has a swelling function in the electrolyte, so that the roll core and the external steel shell are tightly attached, the consistency of the cylindrical lithium ion battery is improved, and the vibration resistance of the battery is improved. Even under the condition of long-time vibration and bump, the cylindrical lithium ion battery obtained by the method is not easy to generate phenomena such as cell loosening or separation of a welding part in the battery. Meanwhile, the cylindrical lithium ion battery provided by the embodiment of the invention omits a diaphragm on the outermost negative plate, and the conductive swelling glue has conductive performance and is tightly combined with the steel shell, so that the negative plate can be electrically communicated with the external steel shell through the conductive swelling glue, thereby increasing an electronic channel, effectively reducing the internal resistance of the battery and enhancing the rate capability. In addition, because the diaphragm on the outer layer of the negative pole piece is omitted, the redundant space in the cylindrical lithium ion battery can be used for prolonging the lengths of the positive pole piece and the negative pole piece, and the capacity of the battery can be improved.
The following description will be given with reference to specific examples.
Example 1
A cylindrical lithium ion battery comprises a steel shell and a roll core sleeved in the steel shell, wherein the roll core is formed by winding a positive plate, a negative plate and a diaphragm, the outmost layer of the roll core is a negative plate copper foil, conductive swelling glue is filled between the roll core and the steel shell, the negative plate copper foil is electrically connected with the steel shell through the conductive swelling glue, the conductive swelling glue consists of a base material layer and an adhesive layer attached to the base material layer, the adhesive layer consists of a swelling component and a conductive component, and the adhesive layer is bonded on the negative plate copper foil;
the base material layer is a copper foil with the thickness of 8 microns, the bonding layer is composed of polyurethane acrylate, epoxy resin and graphite powder, and the weight ratio of the polyurethane acrylate: epoxy resin: the mass ratio of the graphite powder is 0.5:0.15: 0.35.
The conductive swelling adhesive provided by the embodiment of the invention comprises the following components of ethylene carbonate, dimethyl carbonate, diethyl carbonate: the mass ratio of lithium hexafluorophosphate is 1:1: 1: 0.15 was immersed in the electrolyte at 25 ℃ for 24 hours, and the volume expansion rate was 115%.
The conductive swelling adhesive provided by the embodiment of the invention is soaked in an electrolyte of 1.0 mol/L lithium hexafluorophosphate/ethylene carbonate, dimethyl carbonate and diethyl carbonate (volume ratio is 1:1:1) at 25 ℃ for 24 hours, and the volume expansion rate is 115%.
Example 2
A cylindrical lithium ion battery comprises a steel shell and a roll core sleeved in the steel shell, wherein the roll core is formed by winding a positive plate, a negative plate and a diaphragm, the outmost layer of the roll core is a negative plate copper foil, conductive swelling glue is filled between the roll core and the steel shell, the negative plate copper foil is electrically connected with the steel shell through the conductive swelling glue, the conductive swelling glue consists of a base material layer and an adhesive layer attached to the base material layer, the adhesive layer consists of a swelling component and a conductive component, and the adhesive layer is bonded on the negative plate copper foil;
the base material layer is a 16-micron aluminum foil, the bonding layer is composed of epoxy acrylate, phenolic resin and copper powder, and the epoxy acrylate: phenolic resin: the mass ratio of the copper powder is 0.3:015: 0.55.
The conductive swelling adhesive provided by the embodiment of the invention is soaked in 1.0 mol/L lithium hexafluorophosphate/ethylene carbonate + dimethyl carbonate + diethyl carbonate (volume ratio is 1:1:1) electrolyte at 25 ℃ for 24 hours, and the volume expansion rate is 103%.
Example 3
A cylindrical lithium ion battery comprises a steel shell and a roll core sleeved in the steel shell, wherein the roll core is formed by winding a positive plate, a negative plate and a diaphragm, the outmost layer of the roll core is a negative plate copper foil, conductive swelling glue is filled between the roll core and the steel shell, the negative plate copper foil is electrically connected with the steel shell through the conductive swelling glue, the conductive swelling glue consists of a base material layer and an adhesive layer attached to the base material layer, the adhesive layer consists of a swelling component and a conductive component, and the adhesive layer is bonded on the negative plate copper foil;
the base material layer is a copper foil with the thickness of 12 microns, the bonding layer is composed of epoxy acrylate, polyester acrylate, phenolic resin and graphite, and the epoxy acrylate: polyester acrylate: phenolic resin: the mass ratio of the graphite is 0.2:0.2:0.3: 0.3.
The conductive swelling adhesive provided by the embodiment of the invention is soaked in electrolyte with the components of 1.0 mol/L lithium hexafluorophosphate/ethylene carbonate + dimethyl carbonate + diethyl carbonate (volume ratio is 1:1:1) at 25 ℃ for 24 hours, and the volume expansion rate is 120%.
Comparative example 1
The other steps of the cylindrical lithium ion battery adopting the traditional structure (the outermost layer of the winding core, namely the surface of the diaphragm outside the copper foil of the negative plate is coated with the insulating glue, and then the winding core is placed into the steel shell) are the same as those of the cylindrical lithium ion battery in the embodiment 1.
The cylindrical lithium ion batteries provided in examples 1 to 3 and comparative example 1 were subjected to performance tests according to the following methods:
(1) and testing the internal resistance of the battery by using a battery internal resistance instrument.
(2) Vibration test, the test standard refers to the detection standard of 7.3 part vibration test in GB31241-2014 lithium battery national mandatory standard: after the battery is charged with a constant current of 1C and a constant voltage and a current of 0.05C, the battery is fastened on a vibration test bed, and a sinusoidal vibration experiment is carried out according to the parameters in the following table 1.
(3) The roller test method comprises the following steps: and (3) after the battery is charged at a constant current and a constant voltage of 1C and a current of 0.05C is cut off and fully charged, measuring and calculating the internal resistance change before and after the test.
(4) And (3) rate discharge test, namely performing constant current discharge test on the lithium ion battery at the rate of 0.5C, 3C, 4.5C and 6C, wherein the cut-off voltage is 3.0V, the cut-off current is 0.05C, and the discharge capacity of the battery at different rates is divided by the discharge capacity at 0.5C, namely the discharge capacity percentage at each rate.
TABLE 1
f1, f 4-lower limit, upper limit frequency;
f2, f 3-cross over point frequency (f217.62Hz, f449.84Hz);
a1, a 2-acceleration amplitude;
s- -displacement amplitude.
Note: vibration parameters refer to the maximum absolute value of displacement or acceleration, for example: the peak-to-peak displacement corresponding to a displacement of 0.8mm was 1.6 mm.
And (3) testing results:
(1) the results of the internal resistance test of the cells of example 1 and comparative example 1 are shown in fig. 3, wherein a1 is the internal resistance of the cylindrical lithium ion cell of comparative example 1, and B1 is the internal resistance of the cylindrical lithium ion cell of example 1 of the present invention. As can be seen from the figure, the internal resistance of the cylindrical lithium ion battery adopting the embodiment is reduced by 4-5 mOhm, the test result is more concentrated, and the consistency is improved.
By adopting the cylindrical lithium ion battery of the embodiment 2, the internal resistance is reduced by 5-6 milliohms, and by adopting the cylindrical lithium ion battery of the embodiment 3, the internal resistance is reduced by 3-4 milliohms, and the test results are concentrated, so that the consistency is improved.
(2) After the vibration test is finished, the internal resistance change before and after the test is measured and calculated, and the results of the example 1 and the comparative example 1 are shown in fig. 4, wherein a2 is the internal resistance of the cylindrical lithium ion battery of the comparative example 1, and B2 is the internal resistance of the cylindrical lithium ion battery of the example 1 of the invention. As can be seen from the figure, the change in resistance in the cylindrical lithium ion battery of example 1 of the present invention was significantly smaller than that in the cylindrical lithium ion battery of comparative example 1.
Vibration test results show that compared with the cylindrical lithium ion battery of the comparative example 1, the resistance change amplitude in the cylindrical lithium ion batteries of the embodiments 2 and 3 is obviously smaller.
(3) The results of the drum test of example 1 and comparative example 1 are shown in fig. 5, wherein a3 represents the internal resistance of the cylindrical lithium ion battery of comparative example 1, and B3 represents the internal resistance of the cylindrical lithium ion battery of example 1 of the present invention. As can be seen from the figure, the change in resistance in the cylindrical lithium ion battery of example 1 of the present invention was smaller than that in the cylindrical lithium ion battery of comparative example 1.
It can be seen from the results of the above vibration test and the drum test that the anti-seismic performance of the cylindrical lithium ion battery of example 1 of the present invention is significantly better than that of comparative example 1.
Compared with the cylindrical lithium ion battery of comparative example 1, the change in resistance in the cylindrical lithium ion batteries of examples 2 and 3 of the present invention was small.
(4) The results of the rate discharge tests of example 1 and comparative example 1 are shown in fig. 6, wherein a4-1 and a4-2 are the discharge percentages of the two groups of cylindrical lithium ion batteries of comparative example 1, and B4-1 and B4-2 are the discharge percentages of the two groups of cylindrical lithium ion batteries of example 1. As can be seen from the figure, compared with the cylindrical lithium ion battery of comparative example 1, the rate discharge performance of the cylindrical lithium ion battery of example 1 of the invention is improved, and the 6C rate discharge percentage is improved by 11%.
Compared with the cylindrical lithium ion battery of the comparative example 1, the cylindrical lithium ion battery of the embodiment 2 of the invention has the advantages that the rate discharge performance is improved, and the 6C rate discharge percentage is improved by 12%; the rate discharge performance of the cylindrical lithium ion battery in the embodiment 2 of the invention is improved, and the 6C rate discharge percentage is improved by 9%.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A cylindrical lithium ion battery comprises a steel shell and a winding core sleeved in the steel shell, wherein the winding core is formed by winding a positive plate, a negative plate and a diaphragm, the outmost negative plate is not provided with the diaphragm, the outmost layer of the winding core is a negative plate copper foil, a conductive swelling adhesive is filled between the winding core and the steel shell, the negative plate copper foil is electrically connected with the steel shell through the conductive swelling adhesive, the volume expansion rate of the conductive swelling adhesive after being soaked in an electrolyte at 25 ℃ for 24 hours is not less than 100%, the conductivity of the conductive swelling adhesive is not less than 10 ≥4S/m; the conductive swelling glue is composed of a base material layer and an adhesive layer attached to the base material layer, the adhesive layer is composed of a swelling component and a conductive component, and the adhesive layer is bonded to the negative plate copper foil.
2. The cylindrical lithium ion battery of claim 1, wherein the swelling component is at least one of a urethane acrylate, an epoxy acrylate, and a polyester acrylate.
3. The cylindrical lithium ion battery of claim 1, wherein the conductive component is at least one of an organic conductive component, a metal powder, and a graphite powder.
4. The cylindrical lithium ion battery of claim 3, wherein the organic conductive component comprises epoxy, silicone, polyimide, phenolic, polyurethane, acrylic, and the metal powder comprises copper, aluminum, iron, nickel, zinc, silver, gold.
5. The cylindrical lithium ion battery of any one of claims 1-4, further comprising a negative electrode tab, wherein one end of the negative electrode tab is disposed between the negative electrode sheet copper foil and the conductive swelling glue, and the other end of the negative electrode tab is electrically connected to an external negative electrode of the battery.
6. The cylindrical lithium ion battery of any of claims 1-4, wherein the substrate layer comprises at least one of a copper foil and an aluminum foil.
7. The cylindrical lithium ion battery according to any one of claims 1 to 4, wherein the thickness of the substrate layer is 60 μm or less.
8. The cylindrical lithium ion battery according to any one of claims 1 to 4, wherein the adhesive layer has a thickness of 100 μm or less.
9. The cylindrical lithium ion battery according to any one of claims 1 to 4, wherein the adhesive layer is composed of urethane acrylate, epoxy resin, and graphite powder in a mass ratio of 0.5:0.15: 0.35.
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| CN106410265A (en) * | 2016-10-31 | 2017-02-15 | 深圳市比克动力电池有限公司 | Cylindrical lithium-ion battery |
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| DE19521727B4 (en) * | 1994-06-27 | 2006-04-06 | Toshiba Battery Co., Ltd. | Alkaline secondary battery |
| US20100285358A1 (en) * | 2009-05-07 | 2010-11-11 | Amprius, Inc. | Electrode Including Nanostructures for Rechargeable Cells |
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| CN102195075A (en) * | 2010-03-03 | 2011-09-21 | 索尼公司 | Cylindrical nonaqueous electrolyte battery |
| CN106410265A (en) * | 2016-10-31 | 2017-02-15 | 深圳市比克动力电池有限公司 | Cylindrical lithium-ion battery |
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