EP-4738522-A1 - BATTERY AND BATTERY MANUFACTURING METHOD

Abstract

A battery (1) includes a unit cell (60) including: an electrode current collector(10); an electrode active material layer (20) disposed on a main surface of the electrode current collector (10); a solid electrolyte layer (30) disposed on a side of the electrode active material layer (20) opposite from the electrode current collector (10); a counter electrode active material layer (40) disposed on a side of the solid electrolyte layer (30) opposite from the electrode active material layer (20); and a counter electrode current collector (50) disposed on a side of the counter electrode active material layer (40) opposite from the solid electrolyte layer (30). A first region (71) not covered with the electrode active material layer (20) is provided at an end portion of the main surface (11) of the electrode current collector (10) in a first direction. A second region (72) not covered with the solid electrolyte layer (30) in a plan view is provided at an end portion of the electrode active material layer (20) in the first direction. A third region (73) not covered with the counter electrode active material layer (40) in the plan view is provided at an end portion of the solid electrolyte layer (30) in the first direction.

Inventors

• KOSHIZUKA, TSUTOMU
• KAWASE, AKIRA
• HONDA, KAZUYOSHI
• MORIOKA, KAZUHIRO

Assignees

• Panasonic Intellectual Property Management Co., Ltd.

Dates

Publication Date

20260506

Application Date

20240517

Claims (20)

1. A battery comprising: a unit cell including: an electrode current collector; an electrode active material layer disposed on a main surface of the electrode current collector; an electrolyte layer disposed on a side of the electrode active material layer opposite from the electrode current collector; a counter electrode active material layer disposed on a side of the electrolyte layer opposite from the electrode active material layer; and a counter electrode current collector disposed on a side of the counter electrode active material layer opposite from the electrolyte layer, wherein a first region not covered with the electrode active material layer is provided at an end portion of the main surface of the electrode current collector in a first direction that is a direction from a center of the main surface towards an outer edge of the main surface of the electrode current collector, a second region not covered with the electrolyte layer in a plan view of the main surface of the electrode current collector is provided at an end portion of the electrode active material layer in the first direction, and a third region not covered with the counter electrode active material layer in the plan view is provided at an end portion of the electrolyte layer in the first direction.
2. The battery according to claim 1, wherein the unit cell includes two electrode active material layers, two electrolyte layers, two counter electrode active material layers, and two counter electrode current collectors, the two electrode active material layers each being the electrode active material layer, the two electrolyte layers each being the electrolyte layer, the two counter electrode active material layers each being the counter electrode active material layer, the two counter electrode current collectors each being the counter electrode current collector, the two electrode active material layers are disposed on two main surfaces of the electrode current collector, the two main surfaces including the main surface, the two electrolyte layers are disposed on sides of the two electrode active material layers opposite from the electrode current collector, the two counter electrode active material layers are disposed on sides of the two electrolyte layers opposite from the two electrode active material layers, the two counter electrode current collectors are disposed on sides of the two counter electrode active material layers opposite from the two electrolyte layers, the first region is provided at an end portion of each of the two main surfaces of the electrode current collector in the first direction, the second region is provided at an end portion of each of the two electrode active material layers in the first direction, and the third region is provided at an end portion of each of the two electrolyte layers in the first direction.
3. The battery according to claim 1, wherein a fourth region not covered with the counter electrode current collector in the plan view is provided at an end portion of the counter electrode active material layer in the first direction.
4. The battery according to claim 3, wherein the unit cell includes two electrode active material layers, two electrolyte layers, two counter electrode active material layers, and two counter electrode current collectors, the two electrode active material layers each being the electrode active material layer, the two electrolyte layers each being the electrolyte layer, the two counter electrode active material layers each being the counter electrode active material layer, the two counter electrode current collectors each being the counter electrode current collector, the two electrode active material layers are disposed on two main surfaces of the electrode current collector, the two main surfaces including the main surface, the two electrolyte layers are disposed on sides of the two electrode active material layers opposite from the electrode current collector, the two counter electrode active material layers are disposed on sides of the two electrolyte layers opposite from the two electrode active material layers, the two counter electrode current collectors are disposed on sides of the two counter electrode active material layers opposite from the two electrolyte layers, the first region is provided at an end portion of each of the two main surfaces of the electrode current collector in the first direction, the second region is provided at an end portion of each of the two electrode active material layers in the first direction, the third region is provided at an end portion of each of the two electrolyte layers in the first direction, and the fourth region is provided at an end portion of each of the two counter electrode active material layers in the first direction.
5. The battery according to claim 1, wherein the electrode active material layer includes an inclined surface in the second region, the inclined surface being inclined to approach the electrode current collector as the electrode active material layer extends in the first direction, and the electrolyte layer includes an inclined surface in the third region, the inclined surface being inclined to approach the electrode current collector as the electrolyte layer extends in the first direction.
6. The battery according to claim 3, wherein the electrode active material layer includes an inclined surface in the second region, the inclined surface being inclined to approach the electrode current collector as the electrode active material layer extends in the first direction, the electrolyte layer includes an inclined surface in the third region, the inclined surface being inclined to approach the electrode current collector as the electrolyte layer extends in the first direction, and the counter electrode active material layer includes an inclined surface in the fourth region, the inclined surface being inclined to approach the electrode current collector as the counter electrode active material layer extends in the first direction.
7. The battery according to any one of claims 1 to 6, wherein the electrode active material layer includes a recess in which the electrolyte layer in the third region is embedded.
8. The battery according to any one of claims 3, 4, and 6, wherein the electrode active material layer includes a recess in which the electrolyte layer in the third region is embedded, and the electrolyte layer includes a recess in which the counter electrode active material layer in the fourth region is embedded.
9. The battery according to claim 1, wherein the unit cell further includes an insulating layer that covers at least part of the first region, at least part of the second region, and at least part of the third region.
10. The battery according to claim 3, wherein the unit cell further includes an insulating layer that covers at least part of the first region, at least part of the second region, and at least part of the third region.
11. The battery according to claim 10, wherein the insulating layer further covers at least part of the fourth region.
12. The battery according to any one of claims 9 to 11, wherein part of the end portion of the counter electrode current collector in the first direction protrudes in the first direction relative to the insulating layer in the plan view.
13. The battery according to claim 12, wherein side surfaces of the electrode current collector, the electrode active material layer, the electrolyte layer, and the counter electrode active material layer are flush with each other at an end portion of the unit cell in a second direction that is a direction from the center towards the outer edge of the main surface of the electrode current collector, the second direction being different from the first direction.
14. The battery according to claim 12, wherein side surfaces of the electrode current collector, the electrode active material layer, the electrolyte layer, the counter electrode active material layer, and the counter electrode current collector are flush with each other at an end portion of the unit cell in a second direction that is a direction from the center towards the outer edge of the main surface of the electrode current collector, the second direction being different from the first direction.
15. The battery according to claim 12, comprising: a plurality of unit cells, each of the plurality of unit cells being the unit cell, wherein the plurality of unit cells are stacked.
16. A battery manufacturing method comprising: stacking a plurality of counter electrode current collectors and a plurality of stacked electrode plates including an electrode current collector, an electrode active material layer, an electrolyte layer, and a counter electrode active material layer, to cause the plurality of counter electrode current collectors to be stacked on a side of the counter electrode active material layer opposite from the electrolyte layer, the electrode active material layer being disposed on a main surface of the electrode current collector, the electrolyte layer being disposed on a side of the electrode active material layer opposite from the electrode current collector, the counter electrode active material layer being disposed on a side of the electrolyte layer opposite from the electrode active material layer; and pressing the plurality of stacked electrode plates and the plurality of counter electrode current collectors collectively after the stacking.
17. The battery manufacturing method according to claim 16, wherein at least one of the plurality of stacked electrode plates includes only the electrode current collector as a current collector.
18. The battery manufacturing method according to claim 16 or 17, wherein the unit cell includes two electrode active material layers, two electrolyte layers, and two counter electrode active material layers, the two electrode active material layers each being the electrode active material layer, the two electrolyte layers each being the electrolyte layer, the two counter electrolyte layers each being the counter electrolyte layer, the two electrode active material layers are disposed on two main surfaces of the electrode current collector, the two main surfaces including the main surface, the two electrolyte layers are disposed on sides of the two electrode active material layers opposite from the electrode current collector, and the two counter electrolyte layers are disposed on sides of the two electrolyte layers opposite from the two electrode active material layers.
19. The battery manufacturing method according to claim 16 or 17, wherein a first region not covered with the electrode active material layer is provided at an end portion of the main surface of the electrode current collector in a first direction that is a direction from a center of the main surface towards an outer edge of the main surface of the electrode current collector, a second region not covered with the electrolyte layer in a plan view of the main surface of the electrode current collector is provided at an end portion of the electrode active material layer in the first direction, and a third region not covered with the counter electrode active material layer in the plan view is provided at an end portion of the electrolyte layer in the first direction.
20. The battery manufacturing method according to claim 19, wherein the counter electrode current collector includes a protrusion that is part of an end portion in the first direction protruding in the first direction.

Description

[Technical Field] The present disclosure relates to batteries and battery manufacturing methods. [Background Art] Patent Literature (PTL) 1 describes a battery in which an electrode current collector, an electrode active material layer, a solid electrolyte layer, a counter electrode active material layer, and a counter electrode current collector are stacked. PTL 2 describes a battery in which an electrode current collector, an electrode active material layer, a solid electrolyte layer, a counter electrode active material layer, and a counter electrode current collector are stacked. In addition, in the battery described in PTL 2, non-opposed sites are provided at the end portions of the electrode active material layer and the solid electrolyte layer. PTL 3 describes a battery in which an electrode current collector, an electrode active material layer, a solid electrolyte layer, a counter electrode active material layer, and a counter electrode current collector are stacked. In addition, in the battery described in PTL 3, steps are provided in the electrode active material layer and the counter electrode active material layer, and an insulating layer is disposed on the counter electrode current collector. [Citation List] [Patent Literature] [PTL 1] Japanese Unexamined Patent Application Publication No. 2019-140079[PTL 2] Japanese Unexamined Patent Application Publication No. 2020-129519[PTL 3] Japanese Unexamined Patent Application Publication No. 2022-104137 [Summary of Invention] [Technical Problem] In the prior art, there is a demand for improved battery reliability. Therefore, it is an object of the present disclosure to provide a highly reliable battery or the like. [Solution to Problem] A battery according to one aspect of the present disclosure includes: a unit cell including: an electrode current collector; an electrode active material layer disposed on a main surface of the electrode current collector; an electrolyte layer disposed on a side of the electrode active material layer opposite from the electrode current collector; a counter electrode active material layer disposed on a side of the electrolyte layer opposite from the electrode active material layer; and a counter electrode current collector disposed on a side of the counter electrode active material layer opposite from the electrolyte layer, wherein a first region not covered with the electrode active material layer is provided at an end portion of the main surface of the electrode current collector in a first direction that is a direction from a center of the main surface towards an outer edge of the main surface of the electrode current collector, a second region not covered with the electrolyte layer in a plan view of the main surface of the electrode current collector is provided at an end portion of the electrode active material layer in the first direction, and a third region not covered with the counter electrode active material layer in the plan view is provided at an end portion of the electrolyte layer in the first direction. A battery manufacturing method according to one aspect of the present disclosure includes: stacking a plurality of counter electrode current collectors and a plurality of stacked electrode plates including an electrode current collector, an electrode active material layer, an electrolyte layer, and a counter electrode active material layer to cause the plurality of counter electrode current collectors to be stacked on a side of the counter electrode active material layer opposite from the electrolyte layer, the electrode active material layer being disposed on a main surface of the electrode current collector, the electrolyte layer being disposed on a side of the electrode active material layer opposite from the electrode current collector, the counter electrode active material layer being disposed on a side of the electrolyte layer opposite from the electrode active material layer; and pressing the plurality of stacked electrode plates and the plurality of counter electrode current collectors collectively after the stacking. [Advantageous Effects of Invention] According to the present disclosure, it is possible to provide a highly reliable battery or the like. [Brief Description of Drawings] [FIG. 1] FIG. 1 is a top view of a battery according to Embodiment 1.[FIG. 2] FIG. 2 is a cross-sectional view of a battery according to Embodiment 1.[FIG. 3] FIG. 3 is a cross-sectional view illustrating another example of the structure of the end portion of the unit cell according to Embodiment 1.[FIG. 4] FIG. 4 is a cross-sectional view of a battery according to Variation 1 of Embodiment 1.[FIG. 5] FIG. 5 is a cross-sectional view of a battery according to Variation 2 of Embodiment 1.[FIG. 6] FIG. 6 is a cross-sectional view of another battery according to Variation 2 of Embodiment 1.[FIG. 7] FIG. 7 is a cross-sectional view of a battery according to Variation 3 of Embodiment 1.[FIG. 8] FIG. 8 is a cross-sectional v