Lead-acid battery

A lead-acid battery and electrolyte technology, used in lead-acid batteries, lead-acid battery construction, lead-acid battery electrodes, etc., can solve the problems of short-circuit penetration of positive and negative plates, shortened life of lead-acid batteries, and insufficient electrolyte stirring.

Active Publication Date: 2016-08-24
GS YUASA INT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When used in a partially charged state, the life of lead-acid batteries is shortened due to the accumulation of lead sulfate on the positive electrode or the sulfation of the negative electrode
Moreover, in a partially charged state, gas is generated to cause insufficient agitation of the electrolyte, so the electrolyte is easily stratified, and the life of the lead-acid battery is further shortened.
[0003] On the other hand, when the lead-acid battery falls into over-discharge from a partially charged state when the vehicle is left for a long time, etc., it is easy to cause a penetrating short circuit in which the metal lead penetrates the separator and the positive and negative plates are short-circuited.

Method used

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Embodiment

[0048] The negative electrode active material paste is prepared by mixing a predetermined amount of graphite, a predetermined amount of barium sulfate, lignin as an anti-shrinkage agent, and synthetic resin fibers as a reinforcing material with lead powder obtained by ball milling. A paste further containing carbon black was also prepared. Hereinafter, the content is represented by the mass % concentration in the negative electrode active material which has been chemically formed and fully charged. It should be noted that full charge refers to a state in which the terminal voltage during charging measured every 15 minutes shows a constant value (±0.01 V) three times in a row at a rate of 5 hours.

[0049] The graphite content was changed in the range of 0 to 3.0% by mass relative to the mass of the negative electrode active material in a fully charged state. As the graphite, flaky graphite and expanded graphite are used, but other graphites such as earthy graphite and artific...

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Abstract

A lead-acid battery includes a negative electrode material containing graphite or carbon fiber. The ratio of the mass of the negative electrode material to the mass of a positive electrode material is 0.62 or more. Seepage short circuit caused by graphite is not liable to happen to the battery, and the PSOC service life performance is excellent.

Description

technical field [0001] The invention relates to a lead storage battery, in particular to a lead storage battery used in an environment accompanied by deep discharge. Background technique [0002] With the advent of idling-stop cars, lead-acid batteries are increasingly being discharged deeper than ever. For example, the lead-acid battery of an idle-stop vehicle is presupposed to be used in a partial state of charge (PSOC: partial State of Charge). In addition, lead storage batteries for recycling use have conventionally been used at a deep depth of discharge (DOD: Depth of Discharge) like those for forklifts. When used in a partially charged state, the life of the lead storage battery is shortened due to the accumulation of lead sulfate on the positive electrode or the sulfation of the negative electrode. Furthermore, in a partially charged state, gas is generated to cause insufficient agitation of the electrolytic solution, so the electrolytic solution is likely to strati...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/14H01M10/12
CPCH01M4/14H01M4/625H01M10/12H01M2220/20Y02E60/10Y02P70/50
Inventor 稻垣贤京真观
Owner GS YUASA INT LTD
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