A high-voltage power battery with controllable liquid injection volume and its preparation method

A technology with high voltage and liquid injection volume, which is applied in the direction of non-aqueous electrolyte battery electrodes, battery electrodes, secondary batteries, etc. Liquid leakage and other problems can be improved to achieve the effect of improving the consistency of mechanics and realizing the uniformity and consistency of the injection volume

Active Publication Date: 2018-11-13
BEIJING HAWAGA POWER STORAGE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this method is that, on the one hand, the liquid injection efficiency is low, and the electrolyte is easy to leak from the side of the battery cell when the battery cell is packaged; on the other hand, it is difficult to control the consistency and consistency of the liquid injection in each battery cell. Uniformity of electrolyte distribution

Method used

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  • A high-voltage power battery with controllable liquid injection volume and its preparation method
  • A high-voltage power battery with controllable liquid injection volume and its preparation method
  • A high-voltage power battery with controllable liquid injection volume and its preparation method

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Embodiment 1

[0046] The high-voltage power lithium-ion battery of the present invention is designed to meet the power supply requirements of various electric vehicles. Therefore, according to the different application occasions of the battery, the design value of the battery cell voltage is also different, that is, the number of stacked battery cells that make up the battery cell different. At present, the operating voltages of small electric vehicles (including electric bicycles, electric motorcycles and electric sightseeing cars, etc.) are generally 36V, 48V, 64V, 74V and 80V, and large and medium-sized electric vehicles (including pure electric passenger vehicles, pure electric trucks, etc.) , hybrid electric vehicles, electric buses, etc.) the working voltage range is generally 120V ~ 500V.

[0047] This embodiment is a pure electric passenger car power supply, its operating voltage is 320V, the selected cell operating voltage platform is 320V, and the number of superimposed battery un...

Embodiment 2

[0059] This embodiment provides a method for manufacturing a 320V high-voltage battery 600:

[0060] Step 1: Preparation of bipolar electrode sheet 101: apply circular positive electrode coating 103 and negative electrode coating 104 respectively on the positive electrode surface and negative electrode surface of the circular bipolar current collector 102 by spraying, and prepare A bipolar electrode sheet 101 is obtained, wherein the bipolar current collector 102 is a metal-based composite conductive film with a diameter of 39.4 cm and a thickness of 80 μm, and the positive electrode coating 103 sprayed on both sides of the bipolar current collector 102 has a diameter of 38.6 cm. The thickness is 140 μm, the porosity is 35%, the diameter of negative electrode coating 104 is 38.6 cm, the thickness is 120 μm, and the porosity is 30%; In contact with the positive and negative electrode coatings, the inner diameter of the annular sealing ring 201 is 38.6 cm, the outer diameter is ...

Embodiment 3

[0072] In this embodiment, according to the diameter d of the positive electrode coating 103 sprayed on both sides of the bipolar current collector 102 1 , thickness m 1 , and porosity ρ 1 , the diameter d of the negative electrode coating 104 2 , thickness m 2 , and porosity ρ 2 , the amount of electrolyte absorbed by the electrode coating can be calculated as: then, the amount of electrolyte squeezed out from the separator 302 is greater than or equal to the amount Q of electrolyte absorbed by the electrode coating, using the porosity of the separator ρ 3 , diameter d 3 , the liquid absorption rate of the isolation layer q (70%2 -h 1 ), then the thickness h of the isolation layer before compression 3 for:

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Abstract

The invention provides an internal laminated high-voltage power battery with controllable liquid injection volume and a preparation method thereof. By applying pressure on the surface of the battery cell, the thickness of the isolation layer after compression is controlled according to the thickness difference between the annular sealing ring and the bipolar electrode sheet. Thickness, so that the electrolyte in the isolation layer is squeezed out into the electrode coating, on the one hand, it can conveniently and effectively control the amount of electrolyte absorbed by the isolation layer, and realize the uniformity and consistency of the liquid injection volume between the battery cells inside the battery; On the other hand, the electrolyte squeezed out from the separator can be evenly immersed in the micropores of the positive and negative coatings, and the elastic separator is tightly bonded to the adjacent positive and negative coatings through the durable pressure provided by the outside of the battery. The contact can effectively improve the mechanical consistency between the battery units in the battery; the invention provides a high-voltage power battery manufacturing method, the operation mode is simple and effective, and the manufacturing efficiency is high.

Description

technical field [0001] The invention relates to a power battery and its application field, in particular to a high-voltage power lithium-ion battery that can provide energy for pure electric vehicles, hybrid vehicles, electric motorcycles and the like. Background technique [0002] At present, in order to obtain a high-voltage battery with high energy density and high output power density, a plurality of single cells with an operating voltage between 2.0-4.5V are usually connected in series externally. However, this external series connection requires high consistency of single cells, and the external electrical connection will increase the resistance, mass and volume of the entire battery pack, reduce the energy density and power density of the battery pack, and increase the production cost. and security risks. [0003] In order to solve this problem, Chinese patent 201310512781.8 discloses a high-voltage power battery connected in series. Equipped with at least one layer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M2/08H01M2/36H01M2/16H01M2/38H01M4/13H01M10/0585H01M2/14H01M4/139H01M50/184H01M50/186H01M50/193H01M50/463H01M50/489H01M50/491H01M50/682
CPCH01M4/13H01M4/139H01M10/0525H01M10/0585H01M50/183H01M50/403H01M50/411H01M50/70H01M50/60Y02P70/50Y02E60/10
Inventor 陈永翀张晓虎何颖源张艳萍张萍
Owner BEIJING HAWAGA POWER STORAGE TECH
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