Battery module and method for manufacturing a battery module

Abstract

This invention provides a battery module and a method for manufacturing the battery module that can improve the ease of connection, connection stability, and electrical connection of multiple solid-state batteries. It contributes to Sustainable Development Goal 9, "Build resilient infrastructure, promote inclusive and sustainable industrialization and foster innovation." [Solution] The battery module comprises a plurality of stacked single cells, a positive electrode power supply plate, a negative electrode power supply plate, and a battery module can containing the plurality of single cells, a first electrode side power supply plate, and a second electrode side power supply plate. A single cell has a cell body including a battery can containing a battery molded body, a first power supply tab including a first connecting portion, a first cell body connecting portion, and a first power supply plate connecting portion, with the first cell body connecting portion attached to the negative electrode surface of the cell body, and a second power supply tab including a second connecting portion, a second cell body connecting portion, and a second power supply plate connecting portion, with the cell body connecting portion attached to the positive electrode surface of the cell body. In two single cells adjacent to each other in the stacking direction, the connecting portions are connected by fitting, thereby connecting a plurality of single cells and electrically connecting them.

Claims

1. Multiple stacked single cells, The first electrode side power supply plate, The second electrode side power supply plate, An outer casing housing multiple single cells, the first electrode-side power supply plate, and the second electrode-side power supply plate, A battery module equipped with, The aforementioned single cell is A cell body comprising a battery molded body having a positive electrode, a negative electrode, and a solid electrolyte interposed between the positive electrode and the negative electrode, and having a first electrode side surface and a second electrode side surface having the opposite polarity to the first electrode side, and a battery can in which the battery molded body is housed in contact with the outside, A first electrode side power supply tab is provided, on the first electrode surface of the cell body, to which a first cell body connection portion is attached. A second electrode side power supply tab is provided on the second electrode surface of the cell body, with a second cell body connection portion attached thereto. Equipped with, The first electrode-side power supply plate is connected to the first power supply plate connection portion of the first electrode-side power supply tab, The second electrode-side power supply plate is connected to the second power supply plate connection portion of the second electrode-side power supply tab. In two single cells adjacent in the stacking direction, both sets of the connecting portions of the first electrode-side power supply tab of one single cell and the first electrode-side power supply tab of the other single cell, and the connecting portion of the second electrode-side power supply tab of one single cell and the second electrode-side power supply tab of the other single cell, or Multiple single cells are connected by fitting together one of the following pairs of connecting parts: the connecting part of the first electrode side power supply tab of one single cell and the connecting part of the second electrode side power supply tab of the other single cell, and the connecting part of the second electrode side power supply tab of one single cell and the connecting part of the first electrode side power supply tab of the other single cell. Battery module.

2. In the battery module according to claim 1, In two single cells adjacent to each other in the stacking direction, multiple single cells are connected by fitting together both sets of connecting portions: the pair of the connecting portion of the first electrode-side power supply tab of one single cell and the pair of the connecting portion of the first electrode-side power supply tab of the other single cell, and the pair of the connecting portion of the second electrode-side power supply tab of one single cell and the pair of the connecting portion of the second electrode-side power supply tab of the other single cell. Battery module.

3. In the battery module according to claim 1, In two single cells adjacent to each other in the stacking direction, a plurality of single cells are connected by fitting together one of the following pairs of connecting parts: the connecting part of the first electrode-side power supply tab of one single cell and the connecting part of the second electrode-side power supply tab of the other single cell, and the connecting part of the second electrode-side power supply tab of one single cell and the connecting part of the first electrode-side power supply tab of the other single cell. Battery module.

4. In the battery module according to claim 1, The connecting portion of the first electrode-side power supply tab includes one or two fitting portions. The connecting portion of the second electrode-side power supply tab includes one or two fitting portions. Battery module.

5. In the battery module according to claim 1, The first cell body connection portion of the first electrode side power supply tab includes a strip-shaped curved portion that curves along the outer edge of the cell body. The curved portion of the first electrode-side power supply tab is attached while avoiding the central region of the first electrode surface. The second cell body connection portion of the second electrode side power supply tab includes a strip-shaped curved portion that curves along the outer edge of the cell body. The curved portion of the second electrode-side power supply tab is attached while avoiding the central region of the second electrode surface. Battery module.

6. In the battery module according to claim 1, The insulating member is arranged between adjacent single cells in the stacking direction and has a hole formed in its center that penetrates in the thickness direction. Battery module.

7. In the battery module according to claim 6, The insulating member is positioned on the side of the single cell where no adjacent single cells exist, and has a hole formed in its center that penetrates through in the thickness direction. Battery module.

8. In the battery module according to claim 1, The outer casing has a shape that includes a bottom surface which serves as a positive or negative terminal and a side surface which extends from the bottom surface in a first direction along the stacking direction, and a space is formed in which a plurality of the single cells are housed. The connecting portion of the first electrode-side power supply tab of the first single cell, which is a single cell other than the single cell arranged opposite to the bottom surface, includes a first fitting portion that faces the peripheral wall surface of the first single cell and a second fitting portion that extends from the first fitting portion in a second direction opposite to the first direction. The connecting portion of the second electrode side power supply tab of the first single cell includes a third fitting portion facing the peripheral wall surface of the first single cell and a fourth fitting portion extending from the third fitting portion in the second direction. The connecting portion of the first electrode-side power supply tab of the second single cell, which is the single cell positioned opposite the bottom surface, includes a fifth fitting portion that faces the peripheral wall surface of the second single cell, and the connecting portion of the second electrode-side power supply tab of the second single cell includes a sixth fitting portion that faces the peripheral wall surface of the second single cell. In the two first single cells adjacent in the stacking direction, the second fitting portion of the first single cell on the first side, which is farther from the bottom surface, and the first fitting portion of the first single cell on the second side, which is closer to the bottom surface, are fitted together, and the fourth fitting portion of the first single cell on the first side and the third fitting portion of the first single cell on the second side are fitted together. In the second single cell and the first single cell adjacent to the second single cell in the stacking direction, the second fitting portion of the first single cell on the first side and the fifth fitting portion of the second single cell on the second side are fitted together, and the fourth fitting portion of the first single cell on the first side and the sixth fitting portion of the second single cell on the second side are fitted together. Battery module.

9. In the battery module according to claim 8, The first fitting portion and the first power supply plate connection portion of the first electrode-side power supply tab of the first single cell are provided so as to face the peripheral wall surface of the first single cell and be aligned in the circumferential direction. The third fitting portion and the second power supply plate connection portion of the second electrode side power supply tab of the first single cell are provided so as to face the peripheral wall surface of the first single cell and be aligned in the circumferential direction. The fifth fitting portion and the first power supply plate connection portion of the first electrode side power supply tab of the second single cell are provided so as to face the peripheral wall surface of the second single cell and be aligned in the circumferential direction. The sixth fitting portion and the second power supply plate connection portion of the second electrode side power supply tab of the second single cell are provided so as to face the peripheral wall surface of the second single cell and be aligned in the circumferential direction. Battery module.

10. In the battery module according to claim 8, The first power supply plate connection portions of the plurality of first electrode-side power supply tabs are arranged on a first straight line along the stacking direction, and the second power supply plate connection portions of the plurality of second electrode-side power supply tabs are arranged on a second straight line along the stacking direction. The connecting portions of the multiple first electrode-side power supply tabs, when fitted together, are arranged on a third straight line along the stacking direction, and the connecting portions of the multiple second electrode-side power supply tabs, when fitted together, are arranged on a fourth straight line along the stacking direction. Battery module.

11. In the battery module according to claim 8, The first fitting portion includes a fitting claw, and the second fitting portion includes a fitting hole that engages with the fitting claw. The third fitting portion includes a fitting claw, and the fourth fitting portion includes a fitting hole that engages with the fitting claw. The fifth fitting portion includes a fitting claw that fits into the fitting hole of the first fitting portion, The sixth fitting portion includes a fitting claw that fits into the fitting hole of the third fitting portion. Battery module.

12. In the battery module according to claim 11, The first fitting portion includes a fixing claw for fixing the fitted state between the fitting claw and the fitting hole, The third fitting portion includes a fixing claw for fixing the fitted state between the fitting claw and the fitting hole, The fifth fitting portion includes a fixing claw for fixing the fitted state between the fitting claw and the fitting hole, The sixth fitting portion includes a fixing claw for fixing the fitted state between the fitting claw and the fitting hole. Battery module.

13. In the battery module according to claim 1, The battery can is composed of a first electrode can including the first electrode surface and a second electrode can including the second electrode surface, which are insulated from each other. The single cell has an insulating member interposed between the first electrode-side power supply tab and the second electrode can of the single cell. Battery module.

14. Multiple stacked single cells, The first electrode side power supply plate, The second electrode side power supply plate, An outer casing housing multiple single cells, the first electrode-side power supply plate, and the second electrode-side power supply plate, A method for manufacturing a battery module comprising: To manufacture a battery molded body comprising a positive electrode, a negative electrode, and a solid electrolyte interposed between the positive electrode and the negative electrode, and having a first electrode side surface and a second electrode side surface having the opposite polarity to the first electrode side surface, The cell body is manufactured by housing the battery molded body in a battery case having a first electrode surface and a second electrode surface, with the battery molded body in contact with the battery molded body. Performing a chemical treatment on multiple cell bodies, The battery performance test is performed on multiple cell bodies after chemical treatment, Using the cell body that has been determined to be a good product in the aforementioned battery performance test, a first electrode-side power supply tab and a second electrode-side power supply tab are attached to the cell body to manufacture a plurality of the aforementioned single cells. The single cell, the first electrode-side power supply plate, and the second electrode-side power supply plate are housed in the outer casing to assemble the battery module. including, A method for manufacturing battery modules.

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