Battery electrode plate group, storage battery, battery pack, electric vehicle, battery separator, method for manufacturing a battery separator, and method for manufacturing a battery electrode plate group

Abstract

This electrode plate group is provided with: a first electrode plate and a second electrode plate, which overlap with each other in the stacking direction; a separator which covers at least a part of the first electrode plate when viewed from the stacking direction; and a strap which is arranged above the separator in the vertical direction that intersects with the stacking direction, while being electrically connected to the second electrode plate. The first electrode plate has a first main body part; the second electrode plate has a second main body part and a lug part that protrudes upward from the second main body in the vertical direction, while being welded to the strap; and the upper end part of the separator hangs down, while being positioned above the first main body and below the strap in the vertical direction.

Claims

1. A first electrode plate and a second electrode plate that overlap each other in the stacking direction, A separator that covers at least a portion of the first electrode plate when viewed from the stacking direction, A strap is positioned above the separator in the vertical direction intersecting the stacking direction and is electrically connected to the second electrode plate, Equipped with, The first electrode plate has a first main body portion, The second electrode plate has a second main body and an ear portion that protrudes upward from the second main body in the vertical direction and is welded to the strap, and the ear portion is exposed through the opening of the separator. The upper end of the separator has a bent piece that is above the first main body in the vertical direction and located below the strap. The bent piece has a base portion extending in the vertical direction, a curved portion located closer to the strap than the base portion in the vertical direction, and a tip portion located closer to the strap than the curved portion in the vertical direction. The angle between the base portion and the tip portion is 60° or more and 150° or less. Electrode plates for lead-acid batteries.

2. The aforementioned separator is, A first main portion located at one end in the stacking direction, A second main portion located on the other end side in the stacking direction than the first main portion, It has an upper joining portion that joins the first main portion and the second main portion above the first main body portion in the vertical direction, The group of electrode plates for a lead-acid battery according to claim 1, wherein the upper end portion includes the upper joint portion.

3. The first electrode plate has another lug portion that protrudes upward from the first main body portion in the vertical direction, Between the upper joint portion and the other ear portion in the direction perpendicular to the stacking direction and the vertical direction, a closing portion is provided in which the first main portion and the second main portion come into contact with each other. The electrode plate group for a lead-acid battery according to claim 2, wherein the contact between the first main portion and the second main portion in the closed portion is maintained by the effect of deformation between the first main portion and the second main portion accompanying the formation of the upper joint portion.

4. The upper joint portion is located between the first main body and the strap in the vertical direction. The electrode plate group for a lead-acid battery according to claim 2 or 3, wherein the curved portion is provided at least one of the upper and lower ends of the upper joint portion.

5. It comprises a plurality of first plates, a plurality of second plates, and a plurality of separators, Each of the multiple second electrode plates has an ear portion welded to the strap. The electrode plate group for a lead-acid battery according to any one of claims 1 to 4, wherein in each of the plurality of separators, the angle between the base portion and the tip portion is 90° or more and 150° or less.

6. It comprises a plurality of the first electrode plates and a plurality of the second electrode plates, Each of the multiple second electrode plates has an ear portion welded to the strap. Each of the multiple first electrode plates is covered by the separator when viewed from the stacking direction. The electrode plate group for a lead-acid battery according to any one of claims 1 to 4, wherein the direction in which the bent pieces bend at the multiple upper ends included in the separator is aligned.

7. The separator is provided with at least one rib, The electrode plate group for a lead-acid battery according to any one of claims 1 to 6, wherein the rib abuts against the corner of the first main body portion that faces the upper end of the separator in the vertical direction.

8. The electrode plate group for a lead-acid battery according to any one of claims 1 to 7, wherein the separator is located below the first main body in the vertical direction and has a restricting portion that restricts the upward movement of the separator.

9. The electrode plate group for a lead-acid battery according to claim 8, wherein the restricting portion includes a folded-back bent portion of the separator.

10. The electrode plate group for a lead-acid battery according to claim 8, wherein the restricting portion is located between the first main body and the lower end of the separator in the vertical direction and has a lower joining portion that joins a part of the separator to another part.

11. A group of electrode plates for a lead-acid battery according to any one of claims 1 to 10, A battery case housing the aforementioned lead-acid battery electrode plate group, A battery equipped with a storage system.

12. A battery pack comprising the storage battery described in claim 11.

13. An electric vehicle comprising the battery pack described in claim 12.

14. A first electrode plate and a second electrode plate that overlap each other in the first direction, A separator that covers at least a portion of the first electrode plate when viewed from the first direction, In a second direction perpendicular to the first direction, a strap is positioned outside the separator and electrically connected to the second electrode plate, Equipped with, The first electrode plate has a first main body portion, The second electrode plate has a second main body and an ear portion that protrudes from the second main body toward the strap in the second direction and is welded to the strap, the ear portion being exposed through the opening of the separator. The end of the separator located between the first main body and the strap in the second direction is A base portion extending along the second direction, In the second direction, the curved portion is located on the strap side of the base end portion, In the second direction, the tip portion located on the strap side of the curved portion, It has, The angle between the base portion and the tip portion in the inflection portion is 60° or more and 150° or less. Electrode plates for lead-acid batteries.

15. A separator for a lead-acid battery, which encloses the first electrode plate housed in a case, A base having a first main portion located at one end in the first direction and a second main portion located at the other end in the first direction, A joint that connects the first end of the first main part and the second end of the second main part in a second direction perpendicular to the first direction, An opening defined by the first end and the second end, Equipped with, When the lead-acid battery separator encloses the first electrode plate and is housed in the case, the first end and the second end are located in the second direction between the main body of the first electrode plate and a strap welded to the second electrode plate having a different polarity from the first electrode plate. A bent piece is provided by a portion of the first end and the second end, The bent piece has a base end portion extending along the second direction, an inflection portion located closer to the strap than the base end portion in the second direction, and a tip portion located closer to the strap than the inflection portion in the second direction. The angle between the base portion and the tip portion is 60° or more and 150° or less. Separator for lead-acid batteries.

16. The separator for a lead-acid battery according to claim 15, wherein the angle between the base portion and the tip portion is 90° or more and 150° or less.

17. A method for manufacturing a battery separator according to claim 15 or 16, A first step is to position the first main part and the second main part facing each other in the first direction, A second step of forming the joint by joining the first end of the first main part and the second end of the second main part, Equipped with, In the second step, the bent piece is formed in conjunction with the formation of the joint. A method for manufacturing separators for lead-acid batteries.

18. A method for manufacturing a group of electrode plates for a lead-acid battery, comprising the method for manufacturing a separator for a lead-acid battery described in claim 17, In the first step, the first electrode plate is placed between the first main part and the second main part. In the second step, the joint is formed with the first electrode plate positioned between the first main part and the second main part. The process includes a third step, after the second step and after the first and second electrode plates have been laminated, in which the lugs of the second electrode plate are welded to the strap. The bent piece is positioned between the main body portion of the first electrode plate and the strap in the second direction. A method for manufacturing electrode plates for lead-acid batteries.

Images