Electrode subassembly, preparation method thereof and lithium secondary battery

A lithium secondary battery and electrode assembly technology, which is applied in the field of energy storage device manufacturing, can solve the problems of low material utilization, large battery volume, high manufacturing and use costs, etc., achieve high electrode assembly volume, improve electrical performance, and improve yield rate effect

Inactive Publication Date: 2014-01-01
INST OF PHYSICS - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen that in the electrode assembly manufactured according to this structure, the anode current collector and the cathode current collector can only be coated with active materials on one side, the utilization rate of materials is low, the cost of manufacturing and use is high, and it is different from the wound type and other stacked Compared with the type electrode assembly, the volume of the battery is larger under the same capacity

Method used

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  • Electrode subassembly, preparation method thereof and lithium secondary battery
  • Electrode subassembly, preparation method thereof and lithium secondary battery
  • Electrode subassembly, preparation method thereof and lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Figure 4 is a schematic diagram of the electrode assembly of this embodiment before assembly, and Figure 5 After the electrode assembly is assembled, along the Figure 4 A vertical cross-sectional view taken along line A-A in . Such as Figure 4 and Figure 5 As shown, in the electrode assembly 100, the cathode plate 110 is a discontinuous independent insert, and the anode plate 120 is continuously bent into a zigzag vertical section. The cathode plate 110 includes a cathode current collector 111 and a cathode active material 112 coated on both sides of the cathode current collector 111 , and the anode plate 120 includes an anode current collector 121 and an anode active material 122 coated on both sides of the anode current collector 121 . Each cathode plate 110 is respectively wrapped in a diaphragm bag made of polypropylene porous membrane. One end of the diaphragm bag is open, and the two sides of the wrapped cathode plate 110 become the isolation layer 130 . ...

Embodiment 2

[0072] Figure 9 Schematic illustration of the electrode assembly provided for this example before assembly. Figure 10 After the above electrode assembly is assembled, along Figure 9 A vertical cross-sectional view taken along line A-A in . Such as Figure 9 and Figure 10 As shown, in the electrode assembly 200, the cathode plate 210 is a discontinuous independent insert, and the anode plate 220 is continuously bent into a zigzag vertical section. The cathode plate 210 includes a cathode current collector 211 and a cathode active material 212 coated on both sides of the cathode current collector 211 , and the anode plate 220 includes an anode current collector 221 and an anode active material 222 coated on both sides of the anode current collector 221 .

[0073] The settings of the contact area 223 and the bending area 224 are the same as those in the first embodiment. Different from Embodiment 1, the separator 230 is a strip-shaped polyethylene porous film with the same...

Embodiment 3

[0079] This embodiment provides a method for manufacturing a lithium secondary battery, using the electrode assembly provided in Embodiment 1 or Embodiment 2. The specific manufacturing method is as follows: the above-mentioned electrode assembly is placed in an aluminum foil package, and then an electrolyte is injected and packaged. The electrolyte includes 1M LiPF 6 A mixed solution of ethylene carbonate and methyl ethyl carbonate (weight ratio 1:2) was prepared into an aluminum-cased square battery.

[0080] There is no unused space in the lithium secondary battery container prepared in this embodiment, the energy density is high, and short circuit is not easy to occur.

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Abstract

The invention provides an electrode subassembly, a preparation method thereof and a lithium secondary battery. The electrode subassembly is composed of a positive plate, separating layers and negative plates. The positive plate is a continuous positive plate; the two surfaces of an anode current collector of the positive plate are coated with an anode active material; and the positive plate is folded continuously so as to obtain a Z-shaped vertical section. The two surfaces of a cathode current collector of each negative plate are coated with a cathode active material, and are respectively arranged to be opposite to two positive plate opposite surfaces which are formed because of folding, so that the two negative plate surfaces which are coated with the cathode active material are respectively opposite to the two positive plate surfaces which are formed by folding, but positive plate outer surfaces which are formed by folding are not opposite to the surfaces of the negative plate. Each separating layer is arranged between a surface of the positive plate and a surface of a negative plate, wherein the surface of the positive plate and the surface of the negative plate are arranged oppositely. The positive plate and the negative plates are respectively provided with a contact area used for connection of lead wires. The electrode subassembly is easy for preparation, and is suitable for large-scaled production; materials are fully used; and cost is reduced.

Description

technical field [0001] The invention relates to an electrode assembly, a manufacturing method thereof and a lithium secondary battery, belonging to the field of manufacturing energy storage devices such as batteries and capacitors. Background technique [0002] As mobile devices are increasingly developed and demands on the mobile devices are increasing, the demand for batteries as an energy source for the mobile devices is also increasing dramatically. Among them, lithium secondary batteries have been commercialized and widely used due to their high energy density and voltage, extended cycle life, and low self-discharge rate. [0003] The electrode assembly is an important part of the lithium secondary battery. It usually has a structure of multiple sets of cathode plates / separators / anode plates. Currently, there are mainly wound electrode assemblies and stacked electrode assemblies. [0004] A wound-type electrode assembly is manufactured by coating a metal foil serving a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/04H01M10/0525
CPCY02E60/122H01M4/70H01M10/045H01M10/052Y02E60/10Y02P70/50
Inventor 黄学杰赵文武王超
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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