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JP-7856064-B2 - Energy storage cell

JP7856064B2JP 7856064 B2JP7856064 B2JP 7856064B2JP-7856064-B2

Inventors

  • 志村 陽祐
  • 大林 叔朗
  • 山中 篤
  • 千原 真志
  • 杉江 和紀
  • 米川 紘輔
  • 平尾　康裕

Assignees

  • トヨタ自動車株式会社

Dates

Publication Date
20260511
Application Date
20230706

Claims (4)

  1. Electrode body and The system comprises a cell case that houses the electrode body, The aforementioned cell case is A cylindrical body portion formed by shaping a film into a tube, with a first opening and a second opening formed at each end, A first sealing body that closes the first opening, It has a second sealing body that closes the second opening, The first sealing body extends parallel to a virtual plane perpendicular to the first direction in which the first opening and the second opening are aligned, and comprises the first opening and a first plate-like portion adjacent to it in the first direction, It has a first extension portion that extends in the first direction from the first plate-like portion and is located inside the cylindrical main body portion, The first extension is joined to the inner circumferential surface of the cylindrical main body. The first extension portion has an inner layer portion integrally molded with the first plate-like portion and an outer layer portion disposed between the inner layer portion and the cylindrical main body portion. The outer layer is made of resin. An energy storage cell in which the end face of the outer layer in the first direction is in contact with the first plate-like portion .
  2. The first extension extends along the inner circumferential surface of the cylindrical main body and has a cylindrical outer shape, as described in claim 1.
  3. The film comprises a resin layer constituting the inner circumferential surface of the cylindrical body portion and a metal layer laminated on the resin layer . The energy storage cell according to claim 1 , wherein the outer layer is welded to the resin layer of the film.
  4. The energy storage cell according to any one of claims 1 to 3, wherein the first plate-like portion protrudes outward from the cylindrical main body portion when viewed along the first direction.

Description

This disclosure relates to energy storage cells. Patent Document 1 (Japanese Patent Application Publication No. 2021-061100) discloses a battery cell case characterized in that the opening seal is fixed to the container lid via a resin fusion layer between the opening seal film and the container lid film, thereby sealing the opening. Japanese Patent Publication No. 2021-061100 This is a perspective view showing a power storage cell according to one embodiment.This is an exploded perspective view of a storage cell according to one embodiment.This is a cross-sectional view along the line III-III shown in Figure 1.This is a cross-sectional view along the line IV-IV shown in Figure 1.This is a schematic perspective view showing the process of forming the cell case in a storage cell according to one embodiment.This is a partial cross-sectional view showing an enlarged view of region VI in Figure 3. Embodiments of this disclosure will be described with reference to the drawings. Note that in the drawings referenced below, the same or equivalent components are given the same numbers. Figure 1 is a perspective view showing a storage cell according to one embodiment. Figure 2 is an exploded perspective view of the storage cell according to one embodiment. Figure 3 is a cross-sectional view along the line III-III shown in Figure 1. As shown in Figures 1 to 3, the storage cell 10 according to one embodiment comprises an electrode body 100, a cell case 200, a positive electrode member 620 as a positive electrode terminal, and a negative electrode member 520 as a negative electrode terminal. Figure 4 is a cross-sectional view along the line IV-IV shown in Figure 1. For convenience, Figure 4 omits the cell case 200 of the energy storage cell 10, showing only the electrode body 100. The details of the electrode body 100 will be explained with reference to Figure 4. As shown in Figure 4, the electrode body 100 comprises a plurality of positive electrodes 110 and a plurality of negative electrodes 120, and a separator 130. The plurality of positive electrodes 110 and the plurality of negative electrodes 120 are arranged alternately in the thickness direction (second direction D2) while being insulated by the separator 130. Each negative electrode 120 is formed in a rectangular shape with its length in the width direction (first direction D1) and its width direction (third direction D3) in the height direction. The second direction D2 is perpendicular to the first direction D1. The third direction D3 is perpendicular to both the first direction D1 and the second direction D2. Each negative electrode 120 comprises a negative electrode current collector foil 122 and negative electrode active material layers 124 provided on both sides of the negative electrode current collector foil 122. The negative electrode current collector foil 122 has a negative electrode tab 122n (see Figure 3) where the negative electrode active material layer 124 is not provided. The negative electrode tab 122n protrudes toward one side in the first direction D1. Each positive electrode 110 is formed in a rectangular shape with the first direction D1 as its length and the third direction D3 as its width. Each positive electrode 110 includes a positive electrode current collector foil 112 and a positive electrode active material layer 114 provided on both sides of the positive electrode current collector foil 112 in the second direction D2. The positive electrode current collector foil 112 has a positive electrode tab 112p (see Figure 3) where the positive electrode active material layer 114 is not provided. The positive electrode tab 112p protrudes toward the other side in the first direction D1. The separator 130 insulates the positive electrode 110 and the negative electrode 120. The separator 130 is made of an insulating material and has minute voids that allow ion permeability. The separator 130 is formed in a zigzag pattern. The separator 130 has a rectangular shape before being formed into a zigzag pattern. The separator 130 is positioned between the positive electrode 110 and the negative electrode 120, forming a zigzag pattern. The separator 130 has a plurality of intervening portions 132a, a plurality of first folded portions 132b, a plurality of second folded portions 132c, and an outermost covering portion 132d. Each intervening portion 132a is interposed between the positive electrode 110 and the negative electrode 120, which are adjacent to each other in the second direction D2. In other words, each intervening portion 132a has the function of insulating the space between the positive electrode 110 and the negative electrode 120. Each intervening portion 132a is composed of a rectangular region. Each first folded portion 132b connects the ends of adjacent intervening portions 132a in the third direction D3, such that the positive electrode 110 is positioned between them. The first folded portion 132b is positioned on one side (above) of th