CN108110159B - Secondary battery top cap and secondary battery thereof - Google Patents
Secondary battery top cap and secondary battery thereof Download PDFInfo
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- CN108110159B CN108110159B CN201711374764.7A CN201711374764A CN108110159B CN 108110159 B CN108110159 B CN 108110159B CN 201711374764 A CN201711374764 A CN 201711374764A CN 108110159 B CN108110159 B CN 108110159B
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- top cover
- pole
- secondary battery
- cover plate
- resistor
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Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
-
- 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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
-
- 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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/654—Means for temperature control structurally associated with the cells located inside the innermost case of the cells, e.g. mandrels, electrodes or electrolytes
-
- 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
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/574—Devices or arrangements for the interruption of current
- H01M50/578—Devices or arrangements for the interruption of current in response to pressure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2200/00—Safety devices for primary or secondary batteries
- H01M2200/20—Pressure-sensitive devices
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
-
- 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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- 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)
- Gas Exhaust Devices For Batteries (AREA)
- Secondary Cells (AREA)
Abstract
The present invention provides a secondary battery top cap, comprising: the top cover plate is in with the setting first electrode unit, second electrode unit and upset piece on the top cover plate, first electrode unit includes first utmost point post and sets up the resistance on first utmost point post, and first utmost point post passes through resistance and is connected with the top cover plate electricity, and second electrode unit includes second utmost point post and the conducting strip of being connected with second utmost point post electricity, and second utmost point post and top cover plate insulation assembly, upset piece are connected with the top cover plate electricity, and the conducting strip is located the top of upset piece, resistance have electrically conductive filler and adhesive. When the battery is unexpected, the first electrode and the top cover plate are electrically connected through the action of the turnover piece and the resistance, so that the first electrode unit and the second electrode unit are electrically connected to form an external short circuit.
Description
Technical Field
The invention relates to the field of energy storage instruments, in particular to a secondary battery top cover and a secondary battery thereof.
Background
In modern society, driving power sources for more and more electric tools and new energy vehicles are developed in a direction of high capacity and high safety, and batteries are widely used in electric tools and new energy vehicles due to their excellent characteristics such as high capacity. In addition to high capacity, these batteries should have good safety to meet the standard bricks and meet the needs of people.
In order to guarantee the safety of secondary battery, install the upset piece on some battery roofs among the prior art, and connect first electrode and top cap piece through setting up the resistance electricity, thereby when the battery leads to secondary battery inside atmospheric pressure to rise because of accident such as overcharge or electrolyte emergence reaction, the upset piece overturns and is connected with the second electrode electricity, the motion through the upset piece is connected with the electricity of resistance, therefore can be at first electrode, form external current between top cap piece and the second electrode, stop overcharging, slowly overflow the heat dissipation through resistance and release the inside energy of secondary battery, thereby danger such as can not take place overcharge, the fire, explosion, thereby improve secondary battery's security performance.
The battery top cover in the current market adopts the resistor made of common materials, has various defects and directly influences the safety protection effect of the battery. For example, in the prior art, a metal sheet, a conductive plastic or a conductive ceramic is used as a resistor. When the metal sheet is adopted, the contact resistance generally exists between the metal sheet and the electrode pole column and between the metal sheet and the top cover plate, the resistance value is unstable and large in change, the resistance value is difficult to control, when external current is formed, the generated current is too small, the electric charge accumulated by the electric core cannot be reduced, and therefore the protection effect cannot be achieved, and the generated external current is too large to directly melt the top cover plate. When the conductive plastic is adopted, the conductive plastic is used as a resistor to be electrically connected with the first electrode and the top cover plate, and the conductive plastic can be softened or even melted under a higher temperature environment and cannot normally work due to poor high-temperature resistant effect of the conductive plastic. The conductive ceramic is used for connecting the resistor of the first electrode and the top cover plate, the material is high-temperature resistant, but the resistance change is large and the consistency is poor under the influence of temperature, and the material is poor in toughness and bending resistance and easy to break, so that the safety problem cannot be solved.
Therefore, it is urgently required to provide a new top cap structure to solve the safety problem of the secondary battery.
Disclosure of Invention
The present invention is directed to a secondary battery top cap and a secondary battery thereof, which are provided to overcome the disadvantages of the related art, and have a stable resistance value and high temperature resistance, so that the internal resistance value of the top cap is stable. Meanwhile, the secondary battery adopting the top cover can form stable external current when the battery is in accident to release charges accumulated by the battery core, so that the safety performance of the secondary battery is improved.
To achieve the above object, the present invention provides a secondary battery top cap comprising: the top cover plate is in with the setting first electrode unit, second electrode unit and upset piece on the top cover plate, first electrode unit includes first utmost point post and sets up the resistance on first utmost point post, and first utmost point post passes through resistance and is connected with the top cover plate electricity, and second electrode unit includes second utmost point post and the conducting strip of being connected with second utmost point post electricity, and second utmost point post and top cover plate insulation assembly, upset piece are connected with the top cover plate electricity, and the conducting strip is located the top of upset piece, resistance have electrically conductive filler and adhesive.
Furthermore, the thickness of the resistor is 0.1 mm-2 mm. Because the thickness is set to be 0.1 mm-2 mm, the battery can be made into a very thin slice, the thickness of the pole is reduced, and the volume energy density of the battery is improved.
Furthermore, the resistance value of the resistor is 0.1-200 m omega, the resistor with the resistance value within the range can not only realize the electric conduction of the first pole column and the top cover plate and ensure the consistency of the electric potentials of the top cover plate and the first pole column, but also can not generate large current even when external short-circuit current is formed between the first pole column and the second pole column, so that the safety of the secondary battery is ensured.
Further, the conductive filler is selected from one or more of gold powder, silver powder, copper powder, aluminum powder, zinc powder, iron powder, nickel powder and graphite. The conductive filler is preferably nickel powder, and a good conductive network can be formed due to the unique three-dimensional chain structure of the conductive filler, so that the conductive filler is corrosion-resistant and can be stable in the adhesive under a high-temperature environment.
Further, the adhesive is selected from one or more of epoxy resin, acrylic resin and polyvinyl chloride. Preferably one of bismaleimide-bisphenol A diglycidyl ether resin, bismaleimide-novolac epoxy resin, silica-modified bismaleimide-bisphenol A diglycidyl ether resin, and silica-modified bismaleimide-novolac epoxy resin. The epoxy resin is selected, so that the adhesive strength and the dielectric property are good, the deformation shrinkage rate is small, the fusibility between the epoxy resin and the conductive filler is good, and the formed resistance is stable. And the bismaleimide and the epoxy resin are combined, so that the high-temperature resistance of the electric resistance can be greatly improved. More importantly, the epoxy resin modified by the silicon dioxide has better high temperature resistance.
Furthermore, the top cover sheet is provided with a first mounting hole and a second mounting hole, the first pole column is mounted in the first mounting hole in an insulating and sealing mode, and the second pole column is mounted in the second mounting hole in an insulating and sealing mode. The secondary battery top cover further comprises sealing rings, the sealing rings are respectively sleeved on the first pole column and the second pole column and are respectively contained in the first mounting hole and the second mounting hole, and the first pole column and the second pole column are respectively electrically insulated from the top cover plate.
Furthermore, a third mounting hole is formed in the top cover sheet, an explosion-proof valve is arranged in the third mounting hole, and an explosion-proof valve protection sheet is arranged above the explosion-proof valve. When the battery is exposed to severe environment due to improper use, the high-energy battery can generate a large amount of gas and the temperature of the battery is rapidly increased, and the gas rushes the explosion-proof valve to achieve the purpose of pressure relief, so that the safety performance of the battery is improved. The explosion-proof valve protection sheet is mainly used for preventing foreign matters from penetrating the explosion-proof valve or being positioned on the explosion-proof valve to influence the pressure relief purpose of the explosion-proof valve.
The invention also provides a secondary battery, which comprises a battery cell, a shell for accommodating the battery cell and any one of the secondary battery top covers.
The resistor provided by the invention is provided with the conductive filler and the adhesive, the adhesive is used as a carrier, the conductive filler is used as a conductive object, the effect of electrically connecting the top cover plate and the first pole column can be achieved, more importantly, the adhesive is used as a carrier, the high-temperature resistance of the resistor is good, the contact resistance is small, meanwhile, the fusion performance of the adhesive and the conductive filler is good, the resistance value is not influenced by temperature, and therefore, the resistance value of the resistor is stable. When the battery meets accident, when the internal air pressure of the battery rises to reach the turnover pressure of the turnover piece, the turnover piece overturns upwards, because the action of the turnover piece and the electric connection of the resistance to the first electrode and the top cover piece, thereby the first electrode unit and the second electrode unit are electrically connected to form an external short circuit, because the resistance value of the resistance is stable and the contact resistance is small, the external short circuit can be carried out under the current in a reasonable range, the current can be well controlled, thereby the heat productivity is controlled, and further the turnover piece and the top cover are protected from being melted through, the action of protecting the turnover piece and the top cover is achieved, meanwhile, the energy inside the secondary battery is released through the resistance through slow overcurrent heat dissipation, thereby the risks of overcharge, fire, explosion and the like can not occur, and the safety performance of the secondary battery.
Drawings
Fig. 1 is a sectional view of a secondary battery of the present invention.
Fig. 2 is a sectional view of a top cap for a secondary battery according to the present invention.
Fig. 3 is an enlarged view of a portion a in fig. 2.
Fig. 4 is a perspective view of a resistor according to the present invention.
FIG. 5 is a graph showing the rate of change of internal resistance of the top caps of examples 1 to 5 and comparative examples 1 to 2.
Detailed Description
The secondary battery top cap and the secondary battery according to the present invention will be described with reference to the accompanying drawings.
Referring to fig. 1 and 2, the secondary battery includes a secondary battery top cover 1, a battery cell 2, and a case 3 accommodating the battery cell, and a secondary battery electrolyte (not shown) impregnating the battery cell is injected into the case. The secondary battery top cover 1 comprises a top cover sheet 13, and a first electrode unit 11, a second electrode unit 12, an overturning sheet 14, a liquid injection hole 15 and an explosion-proof valve 16 which are arranged on the top cover sheet 13. The top cover plate 13 is provided with a first mounting hole, a second mounting hole and a third mounting hole (not shown in the figure), the first electrode unit 11 is installed in the first mounting hole in an insulating and sealing manner, the second electrode unit 12 is installed in the second mounting hole in an insulating and sealing manner, the third mounting hole is provided with an explosion-proof valve 16, and an explosion-proof valve protection plate 17 is arranged above the explosion-proof valve 16.
The first electrode unit 11 is typically a positive electrode and the second electrode unit 12 is typically a negative electrode. As shown in fig. 2, the second electrode unit 12 includes a second pole post 121, a conductive sheet 122 electrically connected to the second pole post 121, and a second pole post boss 123. The second pole 121, the conductive sheet 122 and the second pole boss 123 may be of a split structure or may be connected to each other to form an integral structure, and the other is of a split structure. Specifically, when the conductive sheet 122 is in a split structure, that is, the conductive sheet is in a split structure with the second pole 121, the second pole 121 and the second pole boss 123 may be in an integrated structure or in a split structure, and when the conductive sheet 122 is in an integrated structure with the second pole 121, the second pole 121 and the second pole boss 123 are in a split structure. The second pole 121 is inserted into the second mounting hole, and the sealing ring 18 is sleeved on the second pole 121 and accommodated in the second mounting hole, so that the second pole 121 and the top cover 13 are assembled in an insulating manner. A lower insulating part 19 is arranged between the second pole boss 123 and the top cover plate 13, and the second pole boss 123 is electrically connected with the negative pole piece of the battery cell 2. An upper insulating part 20 is arranged between the conducting plate 122 and the top cover plate 13, the conducting plate 122 is positioned above the turnover plate 14, and the turnover plate 14 is arranged on the top cover plate 13 and electrically connected with the top cover plate.
As shown in fig. 3, the first electrode unit 11 includes a first pole 111, a resistor 112, and a first pole boss 113. The first pole 111 and the first pole boss 113 may be both of a split structure and an integrated structure. Specifically, when the first pole 111 and the first pole boss 113 are of a split structure, the top end of the first pole 111 is riveted or welded with an aluminum sheet instead of the boss as shown in fig. 3. The first pole column 111 penetrates through the first mounting hole, and the sealing ring 18 is sleeved on the first pole column 111 and contained in the first mounting hole, so that the first pole column 111 and the top cover plate 13 are assembled in an insulating mode. A lower insulating part 19 is arranged between the first pole boss 113 and the top cover plate 13, and the first pole boss 113 is electrically connected with the positive plate of the battery core 2.
As shown in fig. 4, the resistor 112 has a mounting hole 112a, and the resistor 112 is sleeved on the first pole column 111 through the mounting hole 112a, so as to electrically connect the first pole column 111 and the top cover 13.
The resistor 112 will be described in detail below.
The resistor is prepared by uniformly mixing the conductive filler and the adhesive and then curing and molding. Of course, according to the requirement, solvent, thinner, cross-linking agent, coupling agent, preservative, toughening agent, thixotropic agent and the like can also be added in the manufacturing process of the resistor. The conductive filler is one or more selected from gold powder, silver powder, copper powder, aluminum powder, zinc powder, iron powder, nickel powder and graphite. The adhesive is selected from one or more of epoxy resin, acrylate resin and polyvinyl chloride. The adhesive is preferably one of bismaleimide-bisphenol A diglycidyl ether resin, bismaleimide-novolac epoxy resin, silica modified bismaleimide-bisphenol A diglycidyl ether resin and silica modified bismaleimide-novolac epoxy resin. Because the conductive filler and the adhesive are adopted and are cured and formed, the thickness of the resistor can be controlled to be 0.1 mm-2 mm. The resistance value of the resistor is 0.1-200 m omega, and the resistance value of the resistor can be controlled by adjusting the proportion of the conductive filler and the adhesive.
The adhesive is used as a carrier, the conductive filler is used as a conductive object, the effect of electrically connecting the top cover plate and the first pole column can be achieved, more importantly, the adhesive is used as the carrier, the high-temperature resistance performance of the resistor is good, the contact resistance is very small, meanwhile, the fusion performance of the adhesive and the conductive filler is good, the resistance value is not affected by the temperature, the resistance value of the resistor is stable, and the internal resistance value of the top cover adopting the resistor is stable.
When the battery meets accident, when the inside atmospheric pressure of battery risees and reaches the upset pressure of upset piece, the upset piece up overturns, because the action of upset piece and the electric connection of resistance to first electrode and top cap piece, thereby make first electrode unit and second electrode unit electricity connect and form outer short circuit, because the resistance value of resistance is stable and contact resistance is little, can control the electric current size well, thereby control calorific capacity size, and then protection upset piece and top cap are not melted and are worn, reach the effect of protection upset piece and top cap, can ensure to digest on the one hand and fall the charging flow, on the other hand can release the energy of hidden danger battery in order to eliminate the potential safety hazard.
The resistor and the secondary battery top cap according to the present invention will be described with reference to specific examples.
Example 1
As shown in fig. 2, the secondary battery top cover 1 comprises a top cover sheet 13, and a first electrode unit 11, a second electrode unit 12, an inversion sheet 14, a liquid injection hole 15 and an explosion-proof valve 16 which are arranged on the top cover sheet 13, and an explosion-proof valve protection sheet 17 is arranged above the explosion-proof valve 16. The first electrode unit 11 is a positive electrode, and the second electrode unit 12 is a negative electrode. The second electrode unit 12 includes a second pole post 121, a conductive sheet 122 electrically connected to the second pole post 121, and a second pole post boss 123. The second pole 121, the conducting strip 122 and the second pole boss 123 are all split structures. The sealing ring 18 is sleeved on the second pole column 121, so that the second pole column 121 and the top cover plate 13 are assembled in an insulating mode. A lower insulating part 19 is arranged between the second pole boss 123 and the top cover plate 13, an upper insulating part 20 is arranged between the conducting plate 122 and the top cover plate 13, the conducting plate 122 is positioned above the turnover plate 14, and the turnover plate 14 is arranged on the top cover plate 13 and electrically connected with the top cover plate. The first electrode unit 11 comprises a first pole 111, a resistor 112 and a first pole boss 113. The first pole 111 and the first pole boss 113 are of a split structure. The sealing ring 18 is sleeved on the first pole 111 to enable the first pole 111 and the top cover plate 13 to be assembled in an insulating mode, and a lower insulating piece 19 is arranged between the first pole boss 113 and the top cover plate 13. The resistor 112 has a mounting hole 112a, and the resistor 112 is sleeved on the first pole column 111 through the mounting hole 112a, so as to electrically connect the first pole column 111 and the top cover plate 13.
The thickness of the resistor is 0.6mm, the resistance value of the resistor is 100m omega, the conductive filler is aluminum powder, and the adhesive is polyvinyl chloride.
Example 2
The thickness of the resistor is 0.6mm, the resistance value of the resistor is 100m omega, the conductive filler is aluminum powder, and the adhesive is bismaleimide-bisphenol A diglycidyl ether resin. The rest is the same as example 1.
Example 3
The thickness of the resistor is 0.6mm, the resistance value of the resistor is 100m omega, the conductive filler is aluminum powder, and the adhesive is silicon dioxide modified bismaleimide-phenolic epoxy resin. The rest is the same as example 1.
Example 4
The thickness of the resistor is 0.6mm, the resistance value of the resistor is 100m omega, the conductive filler is nickel powder, and the adhesive is polyvinyl chloride. The rest is the same as example 1.
Example 5
The thickness of the resistor is 2mm, the resistance value of the resistor is 150m omega, the conductive filler is nickel powder, and the adhesive is bismaleimide-novolac epoxy resin. The rest is the same as example 1.
Comparative example 1
The resistor is made of silicon carbide, the resistance value of the resistor is 150 omega, and the thickness of the resistor is 2 mm. The rest is the same as example 1.
Comparative example 2
The resistor is made of iron-chromium-aluminum alloy, the resistance value of the resistor is 5m omega, and the thickness of the resistor is 2 mm. The rest is the same as example 1.
The caps of examples 1 to 5 and comparative examples 1 to 2 were subjected to the internal resistance change rate test, and the results are shown in fig. 5.
Testing the internal resistance change rate: and (3) carrying out internal resistance test on the top cover of the secondary battery by adopting an HPS3520 alternating current resistance tester, recording the starting internal resistance as R0, and then recording data Ri at certain intervals until 250 h.
Internal resistance change rate (Ri-R0)/R0
As can be seen from the internal resistance change rates of the top caps of examples 1 to 5 and comparative examples 1 to 2 in fig. 5, the secondary battery top cap formed by the resistors made of the conductive filler and the adhesive has a small internal resistance change rate, that is, the internal resistance is relatively stable, while the resistance formed by the silicon carbide or the iron-chromium-aluminum alloy has unstable internal resistance due to the contact resistance or the resistance being greatly affected by the stability. Moreover, when the conductive filler is nickel powder and the adhesive is epoxy resin, the internal resistance of the conductive filler is more stable.
The secondary battery cell and the LiPF are prepared by adopting NCM333 as a positive electrode and graphite as a negative electrode6As a solute, EC + PC + DEC (1:1:1) was used as a solvent, and the top caps and aluminum cases of examples 1 to 5 and comparative examples 1 to 2 were used to fabricate secondary batteries, numbered as secondary batteries 1 to 7, respectively. The overcharge test was carried out with reference to GB/T31485-.
TABLE 1
| Battery numbering | Whether or not to explode | Whether or not to catch fire |
| |
Whether or not | Whether or not |
| |
Whether or not | Whether or not |
| |
Whether or not | Whether or not |
| Secondary battery 4 | Whether or not | Whether or not |
| |
Whether or not | Whether or not |
| Secondary battery 6 | Whether or not | Is that |
| Secondary battery 7 | Whether or not | Is that |
It can be known from the table above, its resistance that adopts the resistance of electrically conductive filler and adhesive to make is very stable, the resistance is 0.1m omega ~ 200m omega, can control outer short circuit current size well, thereby control calorific capacity size, and then protection upset piece and top cap are not melted and are worn, reach the effect of protection upset piece and top cap, slowly overflow the heat dissipation through resistance simultaneously and release the inside energy of secondary battery, thereby danger such as overcharge, fire, explosion can not take place, thereby improve secondary battery's security performance (secondary battery 1 ~ 5). The secondary battery 6 adopts a resistor of silicon carbide, which has large resistance value, and has poor consistency due to large resistance change under the influence of temperature, so that the protective effect on the secondary battery is limited when overcharged. Although the secondary battery 7 made of fe-cr-al alloy does not explode, it has a contact resistance and is difficult to control the resistance value, so that the protection effect on the secondary battery is limited during overcharge, and thus ignition occurs.
It should be noted that the above-mentioned embodiments illustrate rather than limit the scope of the invention, and that those skilled in the art will be able to modify the invention in its various equivalent forms after reading the present invention and to fall within the scope of the invention as defined in the appended claims.
Claims (5)
1. A secondary battery top cap, comprising: the top cover plate, a first electrode unit, a second electrode unit and an overturning sheet are arranged on the top cover plate, the first electrode unit comprises a first pole column and a resistor arranged on the first pole column, the first pole column is electrically connected with the top cover plate through the resistor, the second electrode unit comprises a second pole column and a conducting sheet electrically connected with the second pole column, the second pole column is in insulation assembly with the top cover plate, the overturning sheet is electrically connected with the top cover plate, the conducting sheet is positioned above the overturning sheet, the resistor is provided with conductive filler and adhesive, the adhesive is epoxy resin, the thickness of the resistor is 0.1-2 mm, the resistance of the resistor is 0.1-200 m omega, and the conductive filler is selected from one or more of gold powder, silver powder, copper powder, aluminum powder, zinc powder, iron powder, nickel powder and graphite, the adhesive is selected from one of bismaleimide-bisphenol A diglycidyl ether resin, bismaleimide-novolac epoxy resin, silica modified bismaleimide-bisphenol A diglycidyl ether resin and silica modified bismaleimide-novolac epoxy resin.
2. The secondary battery top cap according to claim 1, wherein the top cap sheet is provided with a first mounting hole and a second mounting hole, the first pole is mounted in the first mounting hole in an insulating and sealing manner, and the second pole is mounted in the second mounting hole in an insulating and sealing manner.
3. The secondary battery top cap according to claim 2, further comprising a sealing ring, wherein the sealing ring is respectively sleeved on the first pole and the second pole and respectively contained in the first mounting hole and the second mounting hole, and the first pole and the second pole are respectively electrically insulated from the top cap piece.
4. The secondary battery top cap according to claim 2, wherein a third mounting hole is further provided on the top cap sheet, the third mounting hole is provided with an explosion-proof valve, and an explosion-proof valve protection sheet is provided above the explosion-proof valve.
5. A secondary battery, comprising a top cover, a battery core and a shell for accommodating the battery core, wherein the top cover is the secondary battery top cover of any one of claims 1 to 4.
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| CN108110159B true CN108110159B (en) | 2021-03-30 |
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| CN108931343A (en) * | 2018-06-15 | 2018-12-04 | 东莞百思利新能源科技有限公司 | A kind of method of inspection of products air tightness |
| CN109326746B (en) * | 2018-10-25 | 2024-06-18 | 江苏正力新能电池技术有限公司 | Battery top cover rubberizing structure and rubberizing method thereof |
| CN109546018B (en) * | 2018-11-27 | 2021-09-17 | 欣旺达电子股份有限公司 | Battery top cover and power battery using same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090263711A1 (en) * | 2008-04-18 | 2009-10-22 | Bongyoung Kim | Battery pack |
| CN203644834U (en) * | 2013-11-11 | 2014-06-11 | 宁德新能源科技有限公司 | Safety top cap of power battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20160043724A (en) * | 2014-10-14 | 2016-04-22 | 주식회사 엘지화학 | Cylindrical-type secondary battery comprising sealing layer |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090263711A1 (en) * | 2008-04-18 | 2009-10-22 | Bongyoung Kim | Battery pack |
| CN203644834U (en) * | 2013-11-11 | 2014-06-11 | 宁德新能源科技有限公司 | Safety top cap of power battery |
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Denomination of invention: Secondary battery top cover and its secondary battery Effective date of registration: 20230824 Granted publication date: 20210330 Pledgee: Wannian Sub branch of Shangrao Bank Co.,Ltd. Pledgor: Jiangxi baisili New Energy Technology Co.,Ltd. Registration number: Y2023980053852 |
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