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Negative electrode collector for lead-acid battery

A technology for negative electrode current collectors and lead-acid batteries, which is applied in the direction of electrode carriers/current collectors, battery electrodes, battery pack components, etc., and can solve problems such as degradation of negative electrode active materials, poor cycle life performance, and poor connections. Achieve the effect of suppressing the degradation of the cycle life and improving the performance of the cycle life

Active Publication Date: 2007-10-03
GS YUASA INT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the conductivity of the active material itself decreases, or the active material falls off the current collector, etc., and the discharge capacity decreases.
[0013] (3) Deterioration of negative electrode active material
In addition, when using the method of charging less, there will be a phenomenon called sulfuration in which lead sulfate with low conductivity that is difficult to be charged accumulates.
As a result of them, the discharge capacity decreases
[0015] (4) Short circuit
In this case, the so-called sealing reaction of the sealed lead-acid battery does not occur, and the cycle life performance deteriorates due to the increase in the specific gravity of the electrolyte accompanied by the decrease of the electrolyte.
[0020] (6) Defects in the connection part
However, the adhesion characteristics of lead-acid storage batteries in the case of using a Pb-Ca-Sn-based alloy current collector are inferior to those in the case of a Pb-Sb-based alloy current collector.

Method used

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  • Negative electrode collector for lead-acid battery
  • Negative electrode collector for lead-acid battery

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0063] The negative electrode current collector provided with the surface layer was manufactured by the rolling method. Various changes have been made to the portion of the negative electrode current collector provided with the surface layer. As the material of the surface layer of the negative electrode current collector, various materials have been used. In addition, a negative electrode current collector with a surface layer was also manufactured by the hot-dip coating method. The outlines of the various negative electrode current collectors manufactured in this way are collectively shown in Table 1, Table 2, and Table 3. Using these negative electrode current collectors, lead storage batteries were manufactured.

[0064] In addition, in the table, the description Pb-0.05%Ca-0.5%Sn refers to a lead alloy containing 0.05% by mass of calcium and 0.5% by mass of tin. In this case, it does not mean that the lead contains no impurities at all. The same applies to other tables.

[00...

no. 2 approach

[0077] The negative electrode current collector was manufactured by the gravity casting method. The material of the negative electrode current collector is an alloy of Pb-0.05%Ca-0.5%Sn. Then, various parts of the negative electrode current collector were provided with surface layers by the hot-dip coating method. The outlines of these various negative electrode current collectors are collectively shown in Tables 4 and 5. Using these negative electrode current collectors, lead storage batteries were manufactured. The manufacturing methods other than the negative electrode current collector have been described above.

[0078] Negative current collector

Surface layer

Recycle

Service life

Performance

Manufacturing

Method

Alloy composition

Make up

With table

Surface layer

Method

Ears

Upper edge

Grid

Lower edge

Side edge

H01

Gravity casting

Make met...

no. 3 approach

[0085] It is not easy to operate in the manufacturing process to provide only the ear part and the upper edge part with a surface layer. Therefore, in the case where the surface layer is partially provided in the parts other than the ears and the upper edge, the influence on the cycle life performance was investigated as follows.

[0086] A negative electrode current collector having a surface layer of Pb-50% Sn or Pb-50% Sb only on the upper edge and ears was manufactured by the rolling method. The thickness of the surface layer is 50 microns. The parts other than the ears and the upper edge of the negative electrode current collector were provided with a surface layer by a hot-dip coating method.

[0087] Using this negative electrode current collector, a lead storage battery was manufactured. The manufacturing methods other than the negative electrode current collector have been described above.

[0088] Negative current collector

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Abstract

A negative electrode current collector for lead storage battery, comprising lattice, upper frame and ear parts, characterized in that the upper frame and ear parts have surface layers each of which consists of a Pb-Sn alloy wherein the mass ratio of Sn based on the alloy total is = 10%, or a Pb-Sb alloy wherein the mass ratio of Sb based on the alloy total is = 10%, or a Pb-Sn-Sb alloy wherein the mass ratio of the sum of Sn and Sb based on the alloy total is = 10%, or Sn, or Sb. Further, there is provided a negative electrode current collector for lead storage battery, comprising lattice, upper frame and ear parts, characterized in that only the upper frame and ear parts have surface layers. Production of a lead storage battery using this negative electrode current collector would provide a lead storage battery exhibiting excellent cycle life performance.

Description

Technical field [0001] The invention relates to a negative electrode collector for lead storage batteries. Background technique [0002] Lead storage batteries have a history of more than 100 years. Although new secondary batteries such as nickel-metal hydride batteries and lithium-ion batteries have been developed, lead-acid batteries are also widely used in automobiles and backup power sources due to their stable quality and low cost. And other fields. [0003] From a structural point of view, lead storage batteries are divided into control valve type lead storage batteries and open type lead storage batteries. In the control valve type lead storage battery, the electrolyte is immersed or held in the positive plate, the negative plate and the diaphragm, and there is basically no free electrolyte. In addition, a control valve is installed in a part called a liquid injection port or a valve seat. On the other hand, in an open-type lead storage battery, there is enough electrolyte...

Claims

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Application Information

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IPC IPC(8): H01M4/68H01M4/73H01M4/74H01M2/28H01M50/541
CPCH01M2/28H01M4/685H01M4/73Y02E60/10H01M50/541
Inventor 坪井裕一
Owner GS YUASA INT LTD