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Bipolar composite electrode plate and preparation method thereof

A composite electrode and bipolar technology, which is applied in the field of lithium-ion batteries, can solve problems affecting battery performance and active materials, and achieve the effects of ensuring battery performance, realizing electronic conduction, and avoiding mutual influence

Inactive Publication Date: 2021-01-05
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Abstract
  • Description
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Problems solved by technology

According to the characteristics of bipolar batteries, the active materials coated on both sides of the current collector are positive active material and negative active material respectively. Since the compaction of the positive material is much higher than that of the negative material, the coating of the bipolar pole piece is completed. Finally, when the active material on one side is rolled, it will affect the active material on the other side, thus affecting the performance of the battery

Method used

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  • Bipolar composite electrode plate and preparation method thereof
  • Bipolar composite electrode plate and preparation method thereof

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Embodiment

[0022] figure 1 It is a structural schematic diagram of a bipolar composite electrode sheet, including a positive electrode current collector 1 and a negative electrode current collector 2; the central area on one side of the positive electrode current collector 1 is coated with a positive electrode material layer 3, and the central area on one side of the negative electrode current collector 2 is coated with There is a negative electrode material layer 4; the other side of the positive electrode collector 1 and the central area of ​​the other side of the negative electrode collector 2 are connected by a bonding layer 5. The positive electrode current collector and the negative electrode current collector are stacked, and at least one side of the 0.5-5cm blank edge around them is connected by ultrasonic welding or laser welding to form a welding area 6, so as to realize electronic conduction.

[0023] Wherein, the positive electrode collector 1 and the negative electrode colle...

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Abstract

The invention discloses a bipolar composite electrode plate and a preparation method thereof, and relates to the technical field of lithium ion batteries. The bipolar composite electrode plate comprises a positive electrode current collector coated with a positive electrode material layer on one side and a negative electrode current collector coated with a negative electrode material layer on oneside, the other side of the positive electrode current collector is connected with the central area of the other side of the negative electrode current collector through a bonding layer, the positiveelectrode current collector and the negative electrode current collector are laminated, and at least one side of the peripheral edge is connected through welding, so that electronic conduction is realized. According to the bipolar composite electrode plate, the positive electrode and the negative electrode are separately prepared, and then the positive electrode plate and the negative electrode plate are compounded in a bonding and welding manner to prepare a bipolar composite electrode plate, so that the mutual influence between the positive electrode and the negative electrode in the rollingpreparation process is effectively avoided, meanwhile, the peripheral edges are connected in a welding manner, electron conduction is realized, and the battery performance is ensured.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a bipolar composite electrode sheet and a preparation method thereof. Background technique [0002] The bottleneck of battery technology has always been one of the important reasons restricting the development of new energy vehicles. How to make breakthroughs in battery technology to improve the cruising range of electric vehicles is a major challenge. In order to ensure the driving ability of the electric vehicle and ensure the large output power of the battery, it is necessary to connect multiple battery cells in series. The external series connection of the battery cells will lead to excessive impedance and reduce the current output capability. In addition, the external connection will occupy the space of the battery and increase the weight of the battery stack, reducing the energy density and power density of the battery. [0003] One of the solutions is to use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/133H01M4/134H01M4/136H01M4/1391H01M4/1393H01M4/1395H01M4/1397H01M4/02H01M4/04H01M10/0525
CPCH01M4/131H01M4/136H01M4/133H01M4/134H01M4/1391H01M4/1393H01M4/1395H01M4/1397H01M4/02H01M4/0404H01M4/0435H01M4/04H01M10/0525H01M2004/029Y02E60/10
Inventor 牛亚如任明秀许涛王晓燕王磊曹勇
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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