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Lithium-ion battery repeating unit, lithium-ion battery and method of use thereof, battery module and automobile

A lithium-ion battery and repeating unit technology, applied in battery electrodes, electrical components, secondary batteries, etc., can solve the problems of low battery energy density, safety issues, etc., and achieve the effects of overcoming poor rate performance, energy improvement, and low cost

Active Publication Date: 2022-02-08
BYD CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present disclosure is to provide a lithium-ion battery repeating unit, a lithium-ion battery and a method for using the same, a battery module, and an automobile, so as to solve the problem of low battery energy density and the safety problem caused by lithium dendrites in the prior art, and Reduce possible volume expansion

Method used

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  • Lithium-ion battery repeating unit, lithium-ion battery and method of use thereof, battery module and automobile
  • Lithium-ion battery repeating unit, lithium-ion battery and method of use thereof, battery module and automobile
  • Lithium-ion battery repeating unit, lithium-ion battery and method of use thereof, battery module and automobile

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Embodiment approach

[0082] In a specific embodiment, the metal body with surface pores may have micropores. For example, in one embodiment, the metal body with surface pores may have two main surfaces perpendicular to the stacking direction, wherein at least one of the main surfaces may be Micropores are formed. Among them, micropores of a certain depth can be formed on the non-porous base metal by methods such as in-situ generation, chemical and physical deposition, and corrosion formation, so as to obtain a metal body with surface pores. For example, use micron copper or copper alloy foil, and use physical vapor deposition (PVD) or chemical vapor deposition (CVD) to deposit a certain thickness of porous metal copper or carbon on the two sides of the foil; or, micron copper or copper The alloy foil is placed in an acidic or alkaline chemical corrosion solution and corroded for a certain period of time to form corrosion holes on both sides.

[0083] In a preferred embodiment, refer to Figure 4...

Embodiment 1

[0108] 1. Preparation of positive electrode: Weigh the positive active material (LiCoO 2 ) 1kg, conductive agent carbon nanotube 20g and binding agent polyvinylidene fluoride (PVDF) 20g join in the N-methylpyrrolidone of 1kg, then stir 30min in the stirrer, form stable and uniform slurry; The slurry Coat evenly on aluminum foil, transfer to an oven to dry at 80°C; press the dried pole pieces under 2MPa pressure, cut them into 50mm×75mm pole pieces, and spot-weld the positive lugs, surface density 30mg / cm 2 .

[0109] 2. Preparation of the separator: take a common commercial 11 μm PVDF-coated lithium battery PE separator and cut it into 77 mm wide.

[0110] 3. Preparation of the first negative electrode: take a common commercial 11 μm PVDF-coated lithium battery PE separator (insulating layer), and hot-press it with a 20 μm thick copper mesh (conductor layer) at 120 ° C for 30 seconds at a pressure of 1 MPa. The copper mesh porosity is 50%, the aperture is 1mm. Weigh 1 kg o...

Embodiment 2

[0115] 1. Prepare the positive electrode and separator according to the method in Example 1.

[0116] 2. Preparation of the first negative electrode: take a common commercial 11 μm PVDF-coated lithium battery PE separator (insulation layer), and hot-press 20 μm thick copper mesh (conductor layer) at 120 ° C for 30 seconds, the pressure is 1 Ma, and the copper mesh porosity is 50%, the aperture is 1mm. Weigh 1 kg of negative electrode active material (D50 of 2 μm silicon oxide and carbon nanotube composite negative electrode material), 10 g of conductive agent acetylene black, 30 g of binder styrene-butadiene rubber (SBR) and 20 g of sodium carboxymethyl cellulose (CMC) Add it to 1kg of deionized water, and then stir in a mixer to form a stable and uniform slurry; coat the slurry evenly on the surface of the above-mentioned conductor layer, and then transfer it to an oven for drying at 80°C; After the pole piece is pressed under 2MPa pressure, it is cut into a pole piece of 50...

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Abstract

The present disclosure relates to a lithium-ion battery repeating unit, a lithium-ion battery and a method for using the same, a battery module, and an automobile. The repeating unit includes a positive electrode, a first diaphragm, and a negative electrode that are sequentially stacked according to the stacking direction. The first negative pole and the second negative pole of electric contact; The first negative pole comprises an active material layer, a conductor layer and an insulating layer, the conductor layer contains an inorganic porous conductive material, and the insulating layer contains an organic porous diaphragm material; in the negative pole, the active material layer, the conductor layer , the insulating layer, the second negative electrode, the insulating layer, the conductor layer and the active material layer are sequentially stacked according to the stacking direction, and the second negative electrode is coated with an insulating material. The lithium ion battery of the present disclosure has high energy density, and can overcome the safety problem caused by lithium dendrites in the existing batteries.

Description

technical field [0001] The present disclosure relates to the battery field, in particular, to a lithium-ion battery repeating unit, a lithium-ion battery and a method for using the same, a battery module and an automobile. Background technique [0002] At present, there are generally two types of batteries used in the market: one is an energy conversion device represented by a fuel flow battery or a liquid flow battery that separates the energy storage active material from the stack that provides a chemical reaction site; the other is a positive electrode, The diaphragm and the negative electrode are uniformly laminated or wound, and the active material is distributed on the positive electrode and the negative electrode to form an energy conversion device that stores energy and power as a whole. The lithium-ion battery belongs to the typical second type, and its positive electrode, separator, and negative electrode are evenly arranged in opposite directions. The positive el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0585H01M4/62H01M4/80H01M10/0525
CPCH01M10/0585H01M4/80H01M4/625H01M10/0525Y02E60/10Y02P70/50
Inventor 王蒙李世彩焦晓朋江正福甘永青
Owner BYD CO LTD
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