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Lead accumulator

A lead-acid battery and electrode technology, applied in lead-acid batteries, lead-acid battery electrodes, lead-acid battery construction, etc., can solve the problems of liquid depletion, inability to inhibit the falling of active substances, and difficulty in effectively filling silica fine powder, etc. Achieve the effect of improving flexibility and toughness

Inactive Publication Date: 2004-06-09
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If such a polymer resin separator is interposed between the positive and negative electrodes, since the distance between the positive and negative electrodes increases, the liquid resistance increases and the output characteristics of the battery, etc. decrease.
Have again, can not suppress this situation that active substance comes off by this method
Therefore, as the charge and discharge are repeated, the amount of active material that does not participate in the charge and discharge increases, so the battery capacity decreases.
[0015] In addition, in the method described in the specification of Japanese Patent No. 3146438, it is difficult to effectively fill the silica fine powder, and not only the desired effect cannot be expected, but also the permeation of oxygen, etc. generated during charging is hindered.
Therefore, it is possible to suppress the reduction reaction of oxygen, resulting in liquid depletion
[0016] Have again, in above-mentioned two kinds of methods, owing to use a large amount of macromolecule resin and silicon dioxide fine powder that do not participate in charging and discharging, so the space that their volume part takes is wasted, and effective active substance quantity reduces

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] (i) Manufacture of negative electrode

[0065] A lead-tin-calcium alloy sheet composed of 0.08% by weight of calcium, 0.8% by weight of tin, and the rest of which is lead is cut with fine slits, expanded to form a large number of mesh holes, and made into an expanded grid with tabs 1a Body 1.

[0066] Lead powder, water, sulfuric acid with a specific gravity of 1.41, carbon powder (electric card black), barium sulfate, woody derivatives and polyester short fibers are prepared in a weight ratio of 1000:115:70:4.1:21:4.1:1 , by making negative electrode paste in this way.

[0067] Fill the negative electrode paste into the expanded grid body 1 obtained above, after forming the active material layer 2, paste the paste paper 3 made of kraft pulp and water-resistant enhancer to prevent the active material from falling off on both sides, and carry out chemical conversion and drying ,get figure 1 and figure 2 Negative terminal shown.

[0068] (ii) Add an organic binder t...

Embodiment 2

[0077] The active material layer on the edge of the left and right ends of the negative electrode does not contain an organic binder, and the same method as in Example 1 is adopted to make the active material layer on the edge of the left and right ends of the positive electrode contain an organic binder. In the same way, a sealed lead-acid storage battery with a rated voltage of 12V and a nominal capacity of 65Ah was made. Take it as battery B.

Embodiment 3

[0089] Figure 6 A transverse cross-sectional view of main parts of the lead acid storage battery of this embodiment is shown.

[0090]After the negative electrode 5 was produced by the same method as in Example 1, the porous resin layer 10 having through holes was formed on the surface of the active material layer 2 on the left and right end edges 4 of the negative electrode 5 as follows.

[0091] Isobutylene rubber was mixed with styrene rubber in a weight ratio of 97.3. A resin solution was obtained by adding 70 parts by mass of toluene to 30 parts by mass of this mixed resin and dissolving it. Adipic dihydroxyamide was dispersed in this resin solution as a foaming agent, and the left and right end edges 4 of the aforementioned negative electrode 5 were immersed in this dispersion liquid. Then, toluene which is a solvent was removed while making it foam at 210 degreeC. At this time, a portion of the resin component is impregnated in the vicinity of the surface of the act...

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Abstract

The present invention relates to a lead-acid battery Comprising a positive and a negative electrode, each having a current collector comprising an expanded grid, characterized in that at least one of the positive electrode and the negative electrode contains an organic binder in an active material layer at an edge portion thereof. This makes it possible to suppress an internal short circuit resulting from the separation or abnormal growth of an active material due to repeated charge / discharge, thereby remarkably prolonging the cycle life of a lead-acid battery.

Description

technical field [0001] The present invention relates to lead accumulators having electrodes employing expanded grids as current collectors. In particular, the present invention relates to techniques for suppressing internal short circuits and prolonging the life of lead-acid batteries due to exfoliation or abnormal growth of active materials. Background technique [0002] In recent years, in order to increase the capacity of lead-acid batteries and the efficiency of the manufacturing process, a grid thinner than that obtained by casting or an extended type grid capable of continuous production is often used. [0003] In lead storage batteries, the volume change of the active material is relatively large during charging and discharging. Therefore, when charging and discharging are repeated, the binding force between the active materials is weakened, and the active materials are likely to fall off from the electrodes. [0004] When the current collector is a cast grid, it is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/06C08K5/14C08L9/06C08L23/22H01M4/14H01M4/62H01M4/74H01M10/12
CPCH01M4/16H01M4/621Y02E60/126H01M4/745Y02E60/10Y02P70/50
Inventor 前田明宏星原直人中岛润二
Owner PANASONIC CORP
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