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JP-2026076359-A - lead acid battery

JP2026076359AJP 2026076359 AJP2026076359 AJP 2026076359AJP-2026076359-A

Abstract

[Problem] To provide a lead-acid battery in which corrosion of the positive electrode current collector is suppressed. [Solution] The disclosed lead-acid battery includes a negative electrode plate containing a negative electrode material, an electrolyte, and a positive electrode plate containing a positive electrode current collector and a positive electrode material disposed around the positive electrode current collector. The positive electrode current collector is composed of a Pb-Sb alloy and has a metallic structure containing a plurality of dendrite arms. The average spacing between the plurality of dendrite arms is 6 μm or less. The negative electrode material contains a polymer compound. The polymer compound contains oxy C2-4 alkylene units as a repeating structure. The content of the polymer compound in the negative electrode material is 30 ppm or more and 500 ppm or less by mass. [Selection Diagram] Figure 1A

Inventors

  • 坂田 亘

Assignees

  • 株式会社ＧＳユアサ

Dates

Publication Date
20260511
Application Date
20260219
Priority Date
20210316

Claims (9)

  1. A negative electrode plate containing a negative electrode material, Electrolyte and A positive electrode plate comprising a positive electrode current collector and a positive electrode material disposed around the positive electrode current collector, The positive electrode current collector is composed of a Pb-Sb alloy and includes a metallic structure containing multiple dendrite arms. The average distance between the plurality of dendrite arms is 6 μm or less. The negative electrode material comprises a polymer compound, The polymer compound contains oxy C2-4 alkylene units as a repeating structure, A lead-acid battery in which the content of the polymer compound in the negative electrode material is 30 ppm or more and 500 ppm or less by mass.
  2. The lead-acid battery according to claim 1, wherein the polymer compound comprises at least one selected from the group consisting of a hydroxy compound containing the repeating structure of the oxy- C2-4 alkylene unit, an etherified hydroxy compound, and an esterified hydroxy compound.
  3. The lead-acid battery according to claim 1 or 2, wherein the polymer compound is one or more selected from polypropylene glycol, polyoxyethylene oleate ester, polyethylene glycol dilaurate, polyethylene glycol distearate, and polyethylene glycol dioleate.
  4. The lead-acid battery according to any one of claims 1 to 3, wherein the average spacing between the plurality of dendrite arms is 1 μm or more.
  5. The lead-acid battery according to any one of claims 1 to 4, wherein the average spacing between the plurality of dendrite arms is 3 μm or more.
  6. A lead-acid battery according to any one of claims 1 to 5, wherein the specific gravity of the electrolyte at 20°C is 1.29 or higher and 1.32 or lower.
  7. A lead-acid battery according to any one of claims 1 to 6, wherein the Sb content in the Pb-Sb alloy is 3.5% by mass or more and 10% by mass or less.
  8. The lead-acid battery according to claim 7, wherein the Sb content in the Pb-Sb alloy is 5% by mass or more and 8% by mass or less.
  9. The aforementioned positive electrode plate is a clad type positive electrode plate. The positive electrode current collector includes a core metal, The lead-acid battery according to any one of claims 1 to 8, wherein the diameter of the core metal is 2.4 mm or more and less than 3.6 mm.

Description

This invention relates to a lead-acid battery. Lead-acid batteries are used in a variety of applications, including automotive and industrial use. A lead-acid battery consists of a negative electrode plate, a positive electrode plate, and an electrolyte. The positive electrode plate includes a positive electrode current collector and a positive electrode active material arranged around the positive electrode current collector. Repeated charge-discharge cycles cause corrosion of the positive electrode current collector. Severe corrosion of the positive electrode current collector reduces characteristics such as life cycle performance. Patent Document 1 (Japanese Unexamined Patent Publication No. 57-061262) discloses a lead-acid battery characterized by the following characteristics: in the crystal grains of a lead alloy used as an anode lattice material, which is either lead-free or contains only a small amount of antimony, the maximum length in the direction perpendicular to the lead lattice surface is 1/2 or less of the lead lattice dimensions, and the minimum length in the direction parallel to the lattice surface of the microcrystals constituting the crystal grains is 1/3 or more of the maximum length of the grain in the same direction. Patent Document 2 (Japanese Unexamined Patent Publication No. 61-27067) discloses "a lead-acid battery in which a lead alloy casting having a dendritic crystal structure, with acid-resistant plastic filled in gaps opening on the surface, is used as the conductive part." Patent Document 3 (Japanese Unexamined Patent Publication No. 52-5425) discloses "a lead-acid battery using a lead alloy grid containing 5% or less antimony, in which a spherical solid solution phase of antimony is uniformly dispersed in a solid solution phase of lead." Japanese Unexamined Patent Publication No. 57-061262Japanese Unexamined Patent Publication No. 61-27067Japanese Unexamined Patent Publication No. 52-5425 This is a schematic diagram illustrating an example of a dendrite arm.This is a schematic diagram illustrating the method for calculating DAS.This is a metallurgical microscope image showing an example of the metallic structure of a positive electrode current collector.This is a metallurgical microscope image showing another example of the metallic structure of a positive electrode current collector.This graph shows an example of the relationship between the DAS (Dynamic Acid Amount) of the positive electrode current collector and the amount of corrosion.This is a schematic perspective view showing an example of a lead-acid battery according to one embodiment of the present invention, with the cover removed.Figure 3 is a front view of the lead-acid battery.Figure 4A is a schematic cross-sectional view of the cross-section along the IVB-IVB line, as seen from the direction of the arrow.This is a schematic top view showing an example of a clad-type positive electrode plate according to one embodiment of the present invention.Figure 5 is a schematic cross-sectional view of the cross-section along the line VI-VI, as seen from the direction of the arrow.This graph shows an example of the results from Experimental Example 1.This graph shows another example of the results from Experiment Example 1.This graph shows an example of the results from Experimental Example 2.This graph shows an example of the results from Experimental Example 3.This graph shows an example of the results from Experimental Example 4. The following describes embodiments of the present invention with examples, but the present invention is not limited to the examples described below. While specific numerical values and materials may be given as examples in the following description, other numerical values and materials may be applied as long as the effects of the present invention are achieved. In this specification, the range described as "numerical value A to numerical value B" includes numerical value A and numerical value B. [Lead acid battery] A lead-acid battery according to one embodiment of the present invention includes a negative electrode plate containing a negative electrode material, an electrolyte, and a positive electrode plate containing a positive electrode current collector and a positive electrode material arranged around the positive electrode current collector. The positive electrode current collector includes a metallic structure containing a plurality of dendrite arms. The average spacing between the plurality of dendrite arms is 20 μm or less. The average spacing between the plurality of dendrite arms may be referred to as "DAS" below. Furthermore, the metallic structure in which the DAS is 20 μm or less may be referred to as "metallic structure (M)" below. The metallic structure containing dendrite arms includes the parts that make up the dendrite arms and the parts that exist between the dendrite arms. Through investigation, the inventors of this application newly discovered that a larger DAS (Digita