JP-7854890-B2 - battery

Inventors

• 大嶋 一生

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

20220725

Claims (6)

1. An electrode body having positive and negative electrodes, A battery case having an opening and housing the electrode body, A sealing plate having terminal mounting holes and sealing the opening, One end of the electrode terminal is electrically connected to either the positive or negative electrode inside the battery case, and the other end is inserted through the terminal mounting hole and exposed to the outside of the sealing plate. An insulating member that insulates at least a portion of the sealing plate and the electrode terminal, A battery equipped with, The sealing plate, the electrode terminals, and the insulating member are provided as an integrally molded product. The terminal mounting hole is formed in a cylindrical shape. The portion of the electrode terminal that is inserted into the terminal mounting hole is formed in a cylindrical shape. One or more recesses are formed in at least one of the sealing plate and the insulating member. Each of the aforementioned recesses is rectangular in shape when viewed from the opening of the recess. In each of the recesses, at least in the portion facing the rotational direction of the cylindrical portion of the electrode terminal, the corner of the opening of the recess is formed in an R shape. If the recess is formed in the sealing plate, the insulating member facing the recess is filled into the recess. A battery in which, if the insulating member has the recess, the sealing plate facing the recess is embedded in the recess.
2. If the recess is formed in the sealing plate, the depth of the recess is at least 1/5 of the thickness of the sealing plate at the periphery of the recess. The battery according to claim 1, wherein, if the recess is formed in the insulating member, the depth of the recess is at least 1/5 of the thickness of the insulating member at the periphery of the recess.
3. The aforementioned recesses are formed in a plurality in at least one of the sealing plate and the insulating member. The battery according to claim 1 or 2, wherein the plurality of recesses are formed around the electrode terminal at positions that are point-symmetrical with respect to the electrode terminal as the center point.
4. The battery according to claim 1 or 2, wherein the thickness of the sealing plate is 1 mm or more.
5. The insulating member includes a glass filler as an insulating filler. The battery according to claim 1 or 2, wherein the glass filler includes SiO₂ - Al₂O₃ - CaO -SrO-based glass and/or SiO₂ - B₂O₃ - ZnO - Na₂O -based glass.
6. The battery according to claim 1, wherein the insulating member has a cylindrical portion located between the terminal mounting hole and the electrode terminal, a first flange portion extending horizontally along the inner surface of the sealing plate, and a second flange portion extending horizontally along the outer surface of the sealing plate, and these cylindrical portion, the first flange portion, and the second flange portion are integrally formed.

Description

This disclosure relates to batteries. In recent years, batteries such as lithium-ion secondary batteries have been suitably used in portable power supplies for personal computers and mobile devices, as well as in power supplies for vehicle propulsion systems such as electric vehicles (BEVs), hybrid electric vehicles (HEVs), and plug-in hybrid electric vehicles (PHEVs). Such batteries, for example, include insulating members for insulating the electrode terminals from the sealing plate. For example, Patent Document 1 below discloses a battery with such a configuration. Japanese Patent Publication No. 2021-086813 Figure 1 is a schematic perspective view showing a battery according to the first embodiment.Figure 2 is a schematic longitudinal cross-sectional view along the line II-II in Figure 1.Figure 3 is a schematic top view showing the sealing plate of Figure 1.Figure 4 is a schematic top view showing a sealing plate according to the second embodiment.Figure 5 is a schematic longitudinal cross-sectional view along the line V-V in Figure 4.Figure 6 is a diagram corresponding to Figure 2 according to the third embodiment.Figure 7 is a diagram corresponding to Figure 2 according to the fourth embodiment.Figure 8 is a schematic diagram showing the configuration of the second flange portion in Figure 7. Hereinafter, several preferred embodiments of the technology disclosed herein will be described with reference to the drawings. Matters other than those specifically mentioned herein but necessary for the implementation of this disclosure (e.g., general battery configurations and manufacturing processes not characterizing this disclosure) can be understood as design matters for those skilled in the art based on prior art. This disclosure can be implemented based on the content disclosed herein and common technical knowledge in the art. Furthermore, the embodiments described herein are not intended to limit this disclosure in any way. Furthermore, each figure is a schematic diagram and does not necessarily faithfully reflect the actual product. In the following, components and parts that perform the same function are denoted by the same reference numerals, and redundant explanations are omitted or simplified as appropriate. Here, in the figures, front, rear, up, down, left, and right are represented by F, Rr, U, D, L, and R, respectively. However, front, rear, up, down, left, and right are merely directions for explanatory purposes and do not limit the battery installation configuration, etc. Also, the rotation direction D1 in the figures is merely a direction for explanatory purposes and does not limit the rotation direction of the current collection terminal (electrode terminal). Furthermore, the following explanation is not intended to limit the technology disclosed herein to the following embodiments. Also, in this specification, the notation "A to B" indicating a range includes not only the meaning of "greater than A and less than B," but also "greater than A" and "less than B." In this specification, "battery" refers to all energy storage devices capable of extracting electrical energy, and is a concept that encompasses both primary and secondary batteries. Furthermore, in this specification, "secondary battery" refers to all energy storage devices capable of repeated charging and discharging through the movement of charge carriers between the positive and negative electrodes via an electrolyte. The electrolyte may be a liquid electrolyte, a gel electrolyte, or a solid electrolyte. Such secondary batteries include not only so-called rechargeable batteries (chemical batteries) such as lithium-ion secondary batteries and nickel-metal hydride batteries, but also capacitors (physical batteries) such as electric double-layer capacitors. The following describes embodiments focusing on lithium-ion secondary batteries. <Battery configuration> Figure 1 is a schematic perspective view of a battery 100. As shown in Figure 1, the battery 100 comprises a battery case 1, an electrode body 10, a current collector terminal 20 (electrode terminal), and an insulating member 30. In Figure 1, an assembly part (hereinafter referred to as the sealing plate assembly 4A) in which the current collector terminal 20 and the insulating member 30 are integrally molded on a sealing plate 4, which is a part of the battery case 1, is shown separately from the other parts. Furthermore, in Figure 1, the sealing plate 4, the current collector terminal 20, and the insulating member 30 are shown separately with respect to the negative electrode. The battery case 1 comprises a case body 2 and a sealing plate 4. The case body 2 and the sealing plate 4 are examples of case components constituting the battery case 1. The case body 2 houses the electrode body 10 and the electrolyte. The case body 2 is a roughly rectangular, flat, rectangular container. In other embodiments, the shape of the battery case 1 may be cylindrical or other shapes. The case