Three-lug laminated composite battery

A composite battery technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of limited application and low energy density, and achieve high charging efficiency, high energy density, and low self-discharge efficiency

Active Publication Date: 2020-11-10
珠海冠宇动力电源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But at the same time, its energy density is not high, only a fraction or even less than a tenth of the energy density of lithium-ion batteries, which seriously limits its application in many fields that have high requirements for energy density.

Method used

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  • Three-lug laminated composite battery
  • Three-lug laminated composite battery
  • Three-lug laminated composite battery

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preparation example Construction

[0159]

[0160] Exemplarily, the present invention also provides a method for preparing the above-mentioned composite battery, the method comprising the following steps:

[0161] (1) preparing a positive electrode sheet for a lithium ion battery and a positive electrode sheet for a supercapacitor; and / or, preparing a positive electrode sheet for a lithium ion battery and a supercapacitor;

[0162] (2) prepare negative plate;

[0163] (3) Lead out two independent positive pole tabs in the positive pole piece for lithium-ion batteries and the positive pole piece for supercapacitors, or lead out two independent positive pole lugs in the positive pole pieces for lithium-ion batteries and supercapacitors; A negative pole lug is drawn from the negative electrode sheet to form a three-pole lug structure with two mutually independent positive pole lugs and a common negative pole lug;

[0164] (4) The composite battery is formed by stacking alternately in the pattern of negative ele...

preparation example 1

[0181] Preparation Example 1 Positive electrode sheet for supercapacitor

[0182] Porous carbon activated carbon powder (specific surface area ≥ 1000m 2 / g), binder PVDF, conductive carbon black, and carbon nanotubes are mixed and dispersed in NMP (N-methylpyrrolidone), and after mixing, they are vacuum stirred to obtain a uniform dispersion to prepare a positive electrode slurry for supercapacitors. The solid component includes 93wt% positive active material, 4wt% binder PVDF, 2wt% conductive carbon black and 1wt% carbon nanotube. The total solid content in the positive electrode slurry for supercapacitor is 40wt%.

[0183] Apply the supercapacitor positive electrode slurry evenly on both sides of the aluminum foil, vacuum dry at 100-120°C for 10-24 hours, and roll until the compaction is 1.0-2.1g / cm 3 , to obtain a number of supercapacitors with positive plate C1 denoted as C-double (such as figure 1 (c) in).

[0184] Apply the positive electrode slurry for supercapacito...

preparation example 2

[0185] Preparation Example 2 Positive electrode sheet for lithium ion battery

[0186] The positive electrode active material (LiNi 0.8 co 0.1 mn 0.1 o 2 ), binder PVDF, conductive carbon black, and carbon nanotubes are mixed and dispersed in NMP, and after mixing, they are stirred in a vacuum to obtain a uniform dispersion to make a cathode slurry for lithium-ion batteries. The solid component includes 94wt% positive active material, 3wt% binder PVDF, 2wt% conductive carbon black and 1wt% carbon nanotube. The total solid content in the positive electrode slurry for lithium ion batteries is 70 wt%.

[0187] Apply the positive electrode slurry for lithium-ion batteries evenly on both sides of the aluminum foil, vacuum dry at 100-120°C for 10-24 hours, and roll until the compaction is 2-4.8g / cm 3 , to obtain the positive electrode sheet L1 for lithium-ion batteries is denoted as L-double (such as figure 2 (c) in).

[0188] Apply the positive electrode slurry for lithium-...

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Abstract

The embodiment of the invention provides a three-lug laminated composite battery, and the battery comprises a positive plate, a negative plate, a diaphragm and electrolyte, wherein the positive and the negative plates are alternately stacked, and the adjacent positive and negative plates are separated by the diaphragm; the positive plates comprise a first positive plate and a second positive plate; the first positive plate comprises a first positive current collector and supercapacitor positive electrode materials arranged on the surfaces of the two sides of the first positive current collector; the second positive plate comprises a second positive current collector and lithium ion battery positive electrode materials arranged on two surfaces of the second positive current collector; the first positive plate is connected with a first positive lug , the second positive plate is connected with a second positive lug, the first positive lug and the second positive lug are mutually independent, and the negative plate is connected with the negative lug. The composite battery has the advantages of a lithium ion battery and a super capacitor, and can avoid a self-discharge effect.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a three-pole tab laminated composite battery. Background technique [0002] In recent years, with the rise and development of electric vehicles, electric bicycles, high-power start-stop equipment and other fields, there is an increasing demand for power supplies with both high energy density and high power density. Lithium-ion batteries have the advantages of large specific energy, high working voltage, environmental friendliness, and no memory effect, but their power density is often only a fraction or even less than one-tenth of that of supercapacitor batteries, and their capacity can be exerted at lower temperatures. low rate problem. [0003] In contrast, supercapacitor batteries have a short charge and discharge time, and can reach more than 95% of their rated capacity after charging for 1 second to 10 minutes; they have good ultra-low temperature characterist...

Claims

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Application Information

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IPC IPC(8): H01M10/0585H01G11/28H01M10/0525H01M16/00
CPCH01M10/0525H01M10/0585H01G11/28H01M16/00Y02E60/13Y02E60/10Y02P70/50H01G11/06H01G11/50H01G11/12H01M4/133H01M4/13H01M4/587H01M10/058H01M10/052H01M50/534H01M4/661H01M50/54
Inventor 伍鹏李素丽
Owner 珠海冠宇动力电源有限公司
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