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Method for lengthening hermetic lead accumulator operation life

A lead-acid battery, sealed technology, applied in the direction of lead-acid batteries, lead-acid battery electrodes, etc., can solve the problem of water loss of sealed lead-acid batteries, affect the service life and other problems, to achieve the suppression of water loss, prolong the service life, suppress gas The effect of rising pressure

Inactive Publication Date: 2006-08-02
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the service life of sealed lead-acid batteries is affected by long-term use of water loss

Method used

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  • Method for lengthening hermetic lead accumulator operation life
  • Method for lengthening hermetic lead accumulator operation life

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: adopt method (1) add additive in electrolyte

[0021] For 12V, 12Ah sealed lead-acid batteries, add 0.1wt% polyvinyl alcohol 17-88 (polymerization degree 1700, alcoholysis degree 88%) in dilute sulfuric acid as the electrolyte of sealed lead-acid batteries. Battery structure such as figure 1 As shown, a plurality of positive electrodes 2 , negative electrodes 3 and separators 4 are arranged inside the battery container 1 , each negative electrode 3 is connected to the negative electrode connection part 7 , and the negative electrode terminal 11 is drawn out from the outside. Once the gas pressure in the battery tank 1 rises abnormally, it can be released through the safety valve 12 .

[0022] 5Amp*2hr discharge, 2Amp*5hr charge, the charge termination voltage is 15.0V, the measured results are as follows figure 2 Shown in curve a.

Embodiment 2

[0023] Embodiment 2: adopt method (1) and (2) simultaneously

[0024] For 12V, 12Ah sealed lead storage battery, add 0.1wt% polyvinyl alcohol 17-88 to dilute sulfuric acid as the sealed lead storage battery electrolyte. The battery structure is as described in Example 1, and the surface of the negative electrode post above the negative electrode connection part (7) is coated with a carbon particle layer (9), which occupies about one-third of the total surface area. Oxygen produced by the positive electrode (2) of the battery diffuses to the carbon particle layer (9) through the upper space (8) of the electrolyte solution in the battery tank (1), and combines with hydrogen ions on its surface to undergo an electrochemical reaction to generate water. Charge and discharge method is as described in embodiment 1, and the result measured is as follows figure 2 Shown in curve b.

Embodiment 3

[0025] Embodiment 3: adopt method (1) and (2) simultaneously

[0026] For 12V, 12Ah sealed lead storage battery, add 0.1wt% polyvinyl alcohol 17-88 to dilute sulfuric acid as the sealed lead storage battery electrolyte. The cell structure was as described in Example 1. The surface of the negative electrode post above the negative electrode connection part (7) is all coated with a carbon particle layer (9). Charge and discharge method is as described in embodiment 1, and the result measured is as follows figure 2 Shown in curve c.

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Abstract

This invention discloses a kind of method that extends the useful life of sealing type lead accumulator. Polyvinyl alcohol, polyacrylic acidic salt or carboxymethyl cellulose are added into electrolyte and / or carbon granule layer is arranged on the surface of cathode pole. It can increase cathode hydrogen overpotential, avoid degradation of cathode activity and make electrochemical reaction easily reacted. Thus, it ensures sealing type lead accumulator capacity do not decrease rapidly after long-term usage. It extends the useful life of sealing type lead accumulator.

Description

technical field [0001] The invention relates to a method for prolonging the service life of a sealed lead storage battery. Background technique [0002] Sealed lead-acid batteries have been widely used in buses, trucks, and vehicles for the elderly or disabled due to their advantages such as no need to replenish water and no flow of sulfuric acid electrolyte when they fall to the ground. Recently various small and large sealed lead storage batteries have also been used as uninterruptible power supplies (UPS). When designing and manufacturing sealed lead-acid batteries, the capacity of the positive electrode is generally smaller than that of the negative electrode, so that the positive electrode is fully charged first when charging, and oxygen is generated at the positive electrode. This oxygen diffuses to the negative electrode when passing through the gap of the separator, and reacts with hydrogen ions on the surface of the negative electrode to generate water. However, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/08H01M4/14
CPCY02E60/126Y02E60/10
Inventor 杨立胡琼
Owner SHANGHAI JIAO TONG UNIV