Method for preparing composite active material bipolar electrode for bipolar lead-acid battery

A composite active material and bipolar electrode technology, which is applied to lead-acid battery electrodes, batteries with bipolar electrodes, lead-acid batteries, etc., can solve the problems of affecting electron conduction in active materials and reducing the conductivity of lead paste , to achieve the effect of improving the specific capacity and cycle life

Active Publication Date: 2016-09-21
BOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method will reduce the conductivity of the lead paste and affect the conduction of electrons in the active material.

Method used

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  • Method for preparing composite active material bipolar electrode for bipolar lead-acid battery
  • Method for preparing composite active material bipolar electrode for bipolar lead-acid battery
  • Method for preparing composite active material bipolar electrode for bipolar lead-acid battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1.1. Coat the plate active material lead paste on the surface of the substrate. The coating thickness of the active material is 1.5mm. Then, evenly and vertically open multiple rows of circular holes on the active material. The diameter of the circular holes is 1mm. The distance between the two round holes is 2mm, and the depth of the round holes is the same as the thickness of the active material coating;

[0027] 1.2, such as figure 1 As shown, some of the circular holes are filled with graphite / PTFE emulsion conductive adhesive and filled, and the circular holes with binder account for 60% of the total number of circular holes; the remaining 40% of the circular holes are left without any treatment to provide for the diffusion of electrolyte. Passage, obtains polar plate, and the mass ratio of PTFE emulsion (60wt%) and graphite is 7:1 in the described graphite / PTFE emulsion conductive adhesive;

[0028] 1.3. Curing the plate obtained in step 1.2 under constant temper...

Embodiment 2

[0034] 1.1. Coat the lead paste of the active material of the plate on the surface of the substrate. The coating thickness of the active material is 3.5mm. Then, evenly and vertically open multiple rows of round holes on the active material. The distance between the two round holes is 3mm, and the depth of the round holes is the same as the thickness of the active material coating;

[0035] 1.2, such as figure 1 As shown, the graphite / PTFE emulsion conductive adhesive is filled in some of the circular holes and filled, the circular holes added with adhesive account for 20% of the total number of circular holes; the remaining 80% of the circular holes do not do any treatment, providing for the diffusion of electrolyte Passage, obtains polar plate, and the mass ratio of PTFE emulsion (40wt%) and graphite in described graphite / PTFE emulsion conductive adhesive is 9:1;

[0036] 1.3. Curing the plate obtained in step 1.2 under constant temperature and humidity conditions. The sta...

Embodiment 3

[0038] 1.1. Coat the lead paste of the active material of the plate on the surface of the substrate. The coating thickness of the active material is 2mm. Then, evenly and vertically open multiple rows of round holes on the active material. The distance between each circular hole is 2.5mm, and the depth of the circular hole is the same as the thickness of the active material coating;

[0039] 1.2, such asfigure 1 As shown, some circular holes are filled with graphite / PTFE emulsion conductive adhesive and filled up. The circular holes with binder account for 40% of the total circular holes. Passage, obtains pole plate, and the mass ratio of PTFE emulsion (20wt%) and graphite is 5:1 in the described graphite / PTFE emulsion conductive binder;

[0040] 1.3. Curing the plate obtained in step 1.2 under constant temperature and humidity conditions. The staged curing process is adopted, that is, first curing at 50°C and 90% humidity for 36 hours, then curing at 65°C and 60% humidity fo...

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Abstract

The invention provides a method for preparing a composite active material bipolar electrode for a bipolar lead-acid battery. The method comprises the following steps: after active material lead plaster of a polar plate is applied on the surface of a substrate, uniformly and vertically forming multiple rows of round holes in the active material, wherein the depth of each round hole is equal to the coating thickness of the active material; after a part of round holes is filled with adhesives and is fully filled, carrying out curing and drying to obtain the composite active material bipolar electrode. The method has the advantages that the combination effect of the active material and the substrate can be improved, smooth electrolyte diffusion is guaranteed, and the prepared bipolar electrode can improve the utilization rate of the electrode active material and can improve the battery capacity and prolong the cycle life of the bipolar lead-acid battery.

Description

technical field [0001] The invention relates to a method for preparing a composite active material bipolar electrode for bipolar lead-acid batteries. Background technique [0002] Bipolar lead-acid battery is a new type of lead-acid battery with high specific capacity, specific power and longer cycle life. The substrate of the bipolar lead-acid battery is a planar structure and the price of the material is generally relatively high (such as metal titanium or conductive ceramics, etc.), so in order to reduce its weight and save production costs, it is necessary to reduce the proportion of the substrate in the electrode , to increase the thickness of the active material. However, studies have found that increasing the thickness of the active material will affect the bonding strength between the active material and the substrate during the curing process, resulting in detachment between the active material and the substrate. Moreover, the increased thickness will also hinder ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/20H01M10/18
CPCH01M4/20H01M10/18Y02E60/10
Inventor 郎笑石蔡克迪李兰张帆杨喜宝王莉丽
Owner BOHAI UNIV
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