JP-7854965-B2 - Energy storage devices

JP7854965B2JP 7854965 B2JP7854965 B2JP 7854965B2JP-7854965-B2

Inventors

榊原徹哉

Assignees

プライムプラネットエナジー＆ソリューションズ株式会社

Dates

Publication Date: 20260507
Application Date: 20230518

Claims (7)

Electrode body and Electrolyte and A case for housing the electrode body and the electrolyte, A case body having a rectangular base, an opening opposite the base, a pair of opposing wide surfaces extending from a pair of opposing long sides on the base, and a pair of opposing narrow surfaces extending from a pair of opposing short sides on the base, A rectangular sealing plate that seals the aforementioned opening, Cases equipped with, A power storage device comprising, The aforementioned sealing plate is Mutually opposing first long side and second long side, Mutually opposing first short side portion and second short side portion, It has, The device has an injection hole for injecting the electrolyte on the first short side side, relative to the straight line CL passing through the midpoint M1 of the first long side and the midpoint M2 of the second long side. Here, The sealing plate has a pair of protrusions that project inward from the inner surface on the bottom side of the case. The pair of protrusions are provided on the inner surface of the sealing plate in the direction of the long side, symmetrically with respect to the liquid injection hole. When the shortest distance between the first short side portion and the second short side portion is set to 1, the shortest distance from the liquid injection hole to the protruding portion is 0.06 or more and 0.13 or less. Energy storage device.
Electrode body and Electrolyte and A case for housing the electrode body and the electrolyte, A case body having a rectangular base, an opening opposite the base, a pair of opposing wide surfaces extending from a pair of opposing long sides on the base, and a pair of opposing narrow surfaces extending from a pair of opposing short sides on the base, A rectangular sealing plate that seals the aforementioned opening, Cases equipped with, A power storage device comprising, The aforementioned sealing plate is Mutually opposing first long side and second long side, Mutually opposing first short side portion and second short side portion, It has, The device has an injection hole for injecting the electrolyte on the first short side side, relative to the straight line CL passing through the midpoint M1 of the first long side and the midpoint M2 of the second long side. Here, The sealing plate has a pair of protrusions, including a first protrusion and a second protrusion, that project inward from the inner surface on the bottom side of the case. The pair of protrusions are provided on the inner surface of the sealing plate in the direction of the long side, symmetrically with respect to the liquid injection hole. Both the first protrusion and the second protrusion are inclined with respect to the inner surface of the sealing plate. The angle between the line segment connecting the base end of the first projection and the base end of the second projection by the shortest distance, and the straight line connecting the tip and base end of the first projection by the shortest distance; and, The angles formed by the aforementioned line segment and the straight line connecting the tip and base of the second projection with the shortest distance are both less than 90 degrees. When the shortest distance between the first short side portion and the second short side portion is set to 1, the shortest distance from the liquid injection hole to the protruding portion is 0.06 or more and 0.13 or less . Energy storage device.
The energy storage device according to claim 1, wherein the aforementioned protrusion has a flat surface facing away from the other aforementioned protrusion.
The aforementioned protrusion is It is plate-shaped, The energy storage device according to claim 1, further comprising a flat first surface on the other side of the protruding portion and a flat second surface on the opposite side of the first surface.
The aforementioned protrusion is inclined with respect to the inner surface of the sealing plate, The energy storage device according to claim 1, wherein the angle on the side of the other side of the angle formed by the protruding portion and the inner surface is less than 90 degrees.
The energy storage device according to any one of claims 1 to 5, wherein the protruding portion is provided continuously and integrally with the sealing plate.
The energy storage device according to any one of claims 1 to 5, wherein the sealing plate is provided with an insulating member extending along the inner surface, and a portion of the insulating member constitutes the protruding portion.

Description

This disclosure relates to energy storage devices. The energy storage element disclosed in Japanese Patent Publication No. 2016-76346 comprises a housing with an electrolyte injection hole in its partition wall, an electrode body housed within the housing, and a stopper member for sealing the electrolyte injection hole, the stopper member having a head larger than the inner diameter of the injection hole and a shaft portion inserted into the injection hole. In this energy storage element, a first recess surrounding the electrolyte injection hole, or a convex portion surrounding the electrolyte injection hole, is formed on the inner surface of the partition wall. The publication states that this configuration can suppress the amount of electrolyte adhering to the inner surface of the partition wall and moving to the outside through the space between the shaft portion of the stopper member and the inner circumferential surface of the electrolyte injection hole. Japanese Patent Publication No. 2013-191450 discloses a method for manufacturing a prismatic secondary battery comprising: a battery case for housing an electrode group; a battery cover for closing the opening of the battery case; a liquid injection port having a recess in the surface of the battery cover and a through-hole opening in the bottom surface of the recess and penetrating the battery cover; and a sealing plug that, after electrolyte is injected into the battery case from the liquid injection port, is fitted into the recess and welded to the battery cover in a state where it is in contact with the bottom surface of the recess to seal the liquid injection port. This manufacturing method is characterized by including an injection step in which an electrolyte injection nozzle head is attached to the liquid injection port, and the head body, made of an elastic material, is connected in a state where it is in contact with the bottom surface of the recess and sealed in the through-hole, thereby injecting the electrolyte into the battery case. The publication states that this configuration prevents electrolyte from adhering to the recess of the liquid injection port when injecting the electrolyte into the battery case, and eliminates welding defects caused by electrolyte adhesion when sealing the liquid injection port. Japanese Patent Publication No. 2016-76346Japanese Patent Publication No. 2013-191450 Figure 1 is a cross-sectional view of the energy storage device 1.Figure 2 is a magnified view of a portion of Figure 1.Figure 3 is a plan view of the sealing plate 14.Figure 4 is a schematic diagram of the electrode body 20.Figure 5 is a partial cross-sectional view of the energy storage device 2. The following describes one embodiment of the technology disclosed herein. The embodiment described herein is not intended to limit the technology disclosed herein. Unless otherwise specified, the technology disclosed herein is not limited to the embodiment described herein. The drawings are schematic and do not necessarily reflect the actual object. Furthermore, components and parts that perform the same function are appropriately denoted by the same reference numerals, and redundant explanations are omitted. In the drawings, the reference numerals "R," "L," "U," "D," "F," and "Rr" indicate "right," "left," "up," "down," "front," and "back," respectively. Furthermore, the notation "A to B" indicating a numerical range means "A or greater and B or less," and also includes the meaning of "greater than A and less than B," unless otherwise specified. In this specification, "energy storage device" refers to a device in which charging and discharging occur through the movement of a charge carrier between a pair of electrodes (positive and negative electrodes) via an electrolyte. Such energy storage devices include secondary batteries such as lithium-ion secondary batteries, nickel-metal hydride batteries, and nickel-cadmium batteries; and capacitors such as lithium-ion capacitors and electric double-layer capacitors. Below, an embodiment of a lithium-ion secondary battery will be described as an example of the energy storage device described above. Figure 1 is a cross-sectional view of the energy storage device 1. Figure 1 shows the cross-sectional structure of the energy storage device 1 along the wide surface 12a. Figure 2 is a partially enlarged view of Figure 1. Figure 2 shows a partially enlarged view of the cross-sectional structure near the liquid injection hole 17 in Figure 1. As shown in Figure 1, the energy storage device 1 comprises a case 10, an electrode body 20, a positive electrode terminal 30, a negative electrode terminal 40, a current collector 50 on the positive electrode side, a current collector 60 on the negative electrode side, an insulating film 70, an insulating member 80, and an electrolyte (not shown). Case 10 is, for example, a component that houses the electrode body 20 and the electrolyte. While not particularly limited, for exampl