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A leak-proof bipolar current collector and high-voltage battery and its preparation method

A bipolar and current collector technology, applied in the direction of electrode carrier/current collector, can solve the problems of poor conductivity, current collector leakage, battery short circuit, etc., and achieve the effects of easy preparation, prevention of internal short circuit, and improved safety

Active Publication Date: 2014-10-01
BEIJING HAWAGA POWER STORAGE TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, in order to solve the problem of current collector leakage, it is generally first to prepare a polymer film, and then plate a metal film on the polymer film to make a composite current collector. Most of this current collector uses both ends to conduct electricity, and its conductivity is poor; Moreover, during long-term use, the electrolyte that penetrates into the metal-penetrating cracks and pores may still seep through the metal-polymer interface, causing an internal short circuit in the battery

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  • A leak-proof bipolar current collector and high-voltage battery and its preparation method
  • A leak-proof bipolar current collector and high-voltage battery and its preparation method
  • A leak-proof bipolar current collector and high-voltage battery and its preparation method

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Embodiment 1

[0047] In this embodiment, the anti-leakage bipolar current collector includes: the metal film 1 is nickel-plated on one side of aluminum; the polymer 2 is polyvinylidene fluoride and polyethylene; and the conductive powder is carbon black. Among them, the thickness of the metal film is 20 μm, the penetrating cracks and holes of the metal film are filled with polyvinylidene fluoride and polyethylene, the thickness of the film layer 3 is 2 μm, the (polyvinylidene fluoride + polyethylene) in the film layer : Carbon black (mass ratio) is (5+25):80.

[0048] The preparation method of the anti-leakage bipolar current collector of this embodiment is as follows:

[0049] 1) Pretreatment of the metal film:

[0050] a. Spray and clean the metal film, that is, the metal film enters the metal film pretreatment chamber 6, sprays and cleans it with acetone, controls the room temperature at 50° C., and cleans for 6 minutes to remove oil stains;

[0051] b. Dry the metal film at a temperat...

Embodiment 2

[0057] In this embodiment, polyvinylidene fluoride and maleic anhydride grafted polyethylene are used as the polymer 2, and the others are the same as in the first embodiment.

[0058] In the preparation method of the anti-leakage bipolar current collector of this embodiment, in step 2), the PE powder is replaced by MAH-g-PE powder, and the other is the same as the first embodiment.

Embodiment 3

[0060] In this embodiment, the anti-leakage bipolar current collector includes: the metal film 1 is copper-plated on one side of aluminum; the polymer 2 is polyvinylidene fluoride and polypropylene; and the conductive powder is carbon black. Among them, the thickness of the metal film is 20 μm, the penetrating cracks and holes of the metal film are filled with polyvinylidene fluoride and polypropylene, the thickness of the film layer 3 is 4 μm, (polyvinylidene fluoride + polypropylene): carbon black (mass ratio ) is (5+25):70.

[0061] The preparation method of the anti-leakage bipolar current collector of this embodiment is as follows:

[0062] 1) Same as step 1) of Embodiment 1;

[0063] 2) Vacuum casting coating of the metal film: pull the metal film to the vacuum casting coating chamber 8, vacuumize, the vacuum degree is 10Pa, the temperature of the heating plate 11 and the heating roller 12 is 280°C, dry the metal film, and make it Keep the metal film at this temperatur...

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Abstract

The invention discloses a leakage-proof bipolar current collector, a high-voltage battery and preparation methods of the leakage-proof bipolar current collector and the high-voltage battery. The leakage-proof bipolar current collector comprises a metal film and polymer permeating into permeable cracks and holes of the metal film, wherein the metal film is made of nickel, aluminium, aluminium-nickel combination, aluminium-copper combination and stainless steel; the polymer is made of one or more of polyethylene, polypropylene, polyamide, polycarbonate, polyvinylidene fluoride, polyethylene grafted with maleic anhydride and styrene / butadiene / styrene copolymer. The leakage-proof bipolar current collector, the high-voltage battery, and the preparation method of the leakage-proof bipolar current collector and the high-voltage battery have the advantages that the permeable cracks and holes of the metal film are filled by utilizing the polymer, so that the permeation of electrolyte can be effectively prevented, the occurrence of the short circuit condition in the battery is prevented and the safety of the battery is improved; and moreover, the structure is simple, the preparation is easy and the industrial application value is significant.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a leak-proof bipolar current collector, a high-voltage battery and a preparation method thereof. Background technique [0002] Energy crisis and environmental degradation have become the biggest obstacles to the development of traditional vehicles, and the development of electric vehicles is an effective means to alleviate these problems. One of the key technologies of electric vehicles is the power battery. At present, due to the advantages of high specific energy, high working voltage, long cycle life, low self-discharge, and no memory effect, lithium-ion batteries have been used as power batteries for electric vehicles and have attracted much attention. In order to collect the current generated by the active material of the battery, the electrode active material is usually coated on the current collector. The current collector is usually a metal foil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/66H01M4/70
CPCY02E60/10
Inventor 陈永翀李琪王秋平张萍林道勇韩立
Owner BEIJING HAWAGA POWER STORAGE TECH
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