The present invention relates to a pouch type case having trimming portions formed on both sides or four corners thereof and a battery pack including the same. The trimming portions are formed on the corners of the pouch type case such that the trimming portions are indented toward an electrode assembly accommodating part to reduce a unit area so as to increase pressure applied to unit cells when a battery pack is assembled, thereby facilitating assembling of the battery pack and increasing cell capacity per unit area. Furthermore, the unit cells can be fixed in the battery pack more stably. The pouch type case reduces the unit area so as to include a relatively large number of cells for pressure applied to the cells when the battery pack is assembled to thereby increase the cell capacity.

The present invention relates to a pouch type case having trimming portions formed on both sides or four corners thereof and a battery pack including the same. The trimming portions are formed on the corners of the pouch type case such that the trimming portions are indented toward an electrode assembly accommodating part to reduce a unit area so as to increase pressure applied to unit cells when a battery pack is assembled, thereby facilitating assembling of the battery pack and increasing cell capacity per unit area. Furthermore, the unit cells can be fixed in the battery pack more stably. The pouch type case reduces the unit area so as to include a relatively large number of cells for pressure applied to the cells when the battery pack is assembled to thereby increase the cell capacity.

Provided is a manufacturing method of a compacted strip-shaped electrode plate including: an undried layer forming step of forming, on a current collector foil, a strip-shaped undried active material layer by rolling out a particle aggregate; a drying step of drying the undried active material layer to form an active material layer; and a pressing step of pressing the active material layer by rollers to compact the active material layer. The particle aggregate is a mixed particle aggregate in which first wet particles manufactured with the content ratio of conductive particles to the total solid content set to W1 and second wet particles manufactured with the content ratio of conductive particles to the total solid content set to W2, W2 being higher than W1, are mixed together.

Provided is a manufacturing method of a compacted strip-shaped electrode plate including: an undried layer forming step of forming, on a current collector foil, a strip-shaped undried active material layer by rolling out a particle aggregate; a drying step of drying the undried active material layer to form an active material layer; and a pressing step of pressing the active material layer by rollers to compact the active material layer. The particle aggregate is a mixed particle aggregate in which first wet particles manufactured with the content ratio of conductive particles to the total solid content set to W1 and second wet particles manufactured with the content ratio of conductive particles to the total solid content set to W2, W2 being higher than W1, are mixed together.

There is provided a method for producing an electrode body including a current collection foil, an electrode mixture layer, a heat resistant layer, and a separator layer are laminated in this order. The method includes applying a liquid heat resistant material forming the heat resistant layer to the electrode mixture layer on an electrode plate that is obtained by forming an electrode mixture layer on the current collection foil and disposing the porous separator layer on the liquid heat resistant material before the liquid heat resistant material according to the application is dried after applying the liquid heat resistant material.

There is provided a method for producing an electrode body including a current collection foil, an electrode mixture layer, a heat resistant layer, and a separator layer are laminated in this order. The method includes applying a liquid heat resistant material forming the heat resistant layer to the electrode mixture layer on an electrode plate that is obtained by forming an electrode mixture layer on the current collection foil and disposing the porous separator layer on the liquid heat resistant material before the liquid heat resistant material according to the application is dried after applying the liquid heat resistant material.

A method for manufacturing an electrode assembly, in which a plurality of electrodes are stacked, wherein a negative electrode and a positive electrode are sequentially and alternately stacked, and a separator is disposed therebetween is provided. The method includes covering a top surface of an electrode disposed at an n layer (n being a natural number) with the separator, heating the separator covering the electrode disposed at the n layer, stacking an electrode disposed at an n+1 layer on the heated separator, covering a top surface of the electrode disposed at the n+1 layer with the separator, and heating the separator covering the electrode disposed at the n+1 layer. The separator is bonded to the electrode, or the separators are bonded to each other to fix the movement of the electrode, thereby improving stability. Since the separator is not stacked in the width direction, capacity per volume increases.

A power storage device has a columnar wound body in which a first and second electrode are placed on top of another with a separator interposed therebetween. The first electrode has a first portion, a second portion, and a first connection portion that connects the first and second portion, and the first and second portion face each other. The first connection portion is provided in a band region of the first current collector along the winding direction of the wound body, as a first exposed portion not having the first active material layer and exposing the first current collector. The first and second portions are portions each having the first active material layer at both sides of the first connection portion. The second electrode is sandwiched by the first portion and the second portion with the separator interposed therebetween, and wound along the winding direction to form the wound body.

After stacking of stacked cell is finished, the control unit performs a cutting process including allowing a separator cutting unit to cut a separator between a separator holding unit and a table for stacking in a state where the separator holding unit holds a lower surface of the separator between a separator roller and the table for stacking, moving the separator holding unit from below the separator roller to one side, and allowing to pass the separator to an upper surface of the table for stacking that has moved to the one side after the completed stacked cell is removed.

A method and an apparatus for manufacturing Z-folded cell stacks. First and second cell components are alternately stacked while a separator web is inserted in between in a Z-shaped or meandering manner and is subsequently wrapped one more time around the cell stack thus obtained. Wrapping is performed at least in part in parallel with a previously obtained cell stack while stacking of the next cell stack is performed. A supply of the separator web required for wrapping is provided in a separator buffer storage, is cut off and held at the trailing end, in the conveying direction, with a separating gripper and is fed with the separating gripper during wrapping.