Multi-tabbed electrodes having high aspect ratios and batteries incorporating the same

Patent metadata

Field	Value
Publication number	US-10319978-B2
Application number	US-201715604759-A
Country	US
Kind code	B2
Filing date	May 25, 2017
Priority date	May 25, 2017
Publication date	Jun 11, 2019
Grant date	Jun 11, 2019

Abstract

Lithium battery cells, and battery packs comprising the same, include an electrolyte, and an anode and a cathode, each of which include a current collector having a length, the length defining a first end and a second end, a width, a host or active material disposed on the current collector between the first end and the second end, a first tab extending from the first end, and a second tab extending from the second end. A plurality of cells can be stacked in a planar configuration, and a plurality of anode first tabs, a plurality of anode second tabs, a plurality of cathode first tabs, and a plurality of cathode second tabs can each be electrically connected via a respective busbar. The anode and cathode can have a length:width ratio of at least three, or 2.5 to 10. The battery cell can be a power source for an electric/hybrid vehicle.

First claim

What is claimed is:

1. A lithium battery cell, comprising:
an electrolyte;
an anode disposed within the electrolyte and including a current collector having a length, the length defining an anode first end, coinciding with a lithium battery cell first end, and an anode second end, coinciding with a lithium battery cell second end, a width, an anode host material disposed on the anode current collector between the anode first end and the anode second end, a first tab extending from the anode first end, and a second tab extending from the anode second end; and
a cathode disposed within the electrolyte and including a current collector having a length, the length defining a cathode first end, coinciding with the lithium battery cell first end, and a cathode second end, coinciding with the lithium battery cell second end, a width, a cathode active material disposed on the cathode current collector between the cathode first end and the cathode second end, a first tab extending from the cathode first end, and a second tab extending from the cathode second end;
wherein the anode has a length to width ratio of at least 2 and the cathode has a length to width ratio of at least 2.

2. The lithium battery cell of claim 1 , wherein the first tab of the cathode is asymmetric to the second tab of the cathode, and/or the first tab of the anode is asymmetric to the second tab of the anode.

3. The lithium battery cell of claim 1 , wherein the anode has a length to width ratio of at least 3 and the cathode has a length to width ratio of at least 3.

4. The lithium battery cell of claim 1 , wherein the anode has a length to width ratio of about 2.5 to about 10, and the cathode has a length to width ratio of about 2.5 to about 10.

5. The lithium battery cell of claim 1 , wherein the anode has a length of about 300 millimeters to about 600 millimeters and a width of about 50 millimeters to about 100 millimeters, and the cathode has a length of about 300 millimeters to about 600 millimeters and a width of about 50 millimeters to about 100 millimeters.

6. The lithium battery cell of claim 1 , wherein the first tab of the cathode is symmetric to the second tab of the cathode, and/or the first tab of the anode is symmetric to the second tab of the anode.

7. The lithium battery cell of claim 1 , further comprising a separator disposed between the anode and cathode and capable of allowing lithium ion transport between the anode and cathode.

8. The lithium battery cell of claim 1 , wherein the lithium battery comprises a lithium-ion battery, or a lithium metal battery.

9. A battery pack, comprising:
a plurality of anodes, wherein each anode includes an anode length, the anode length defining an anode first end, coinciding with a battery pack first end, and an anode second end, coinciding with a battery pack second end, an anode width, a first anode tab extending from the anode first end, and a second anode tab extending from the anode second end;
a plurality of cathodes, wherein each cathode includes a cathode length, the cathode length defining a cathode first end, coinciding with the battery pack first end, and a cathode second end, coinciding with the battery pack second end, a cathode width, a first cathode tab extending from the cathode first end, and a second cathode tab extending from the cathode second end;
an anode busbar connecting the plurality of first anode tabs and the plurality of second anode tabs to a negative terminal; and
a cathode busbar connecting the plurality of first cathode tabs and the plurality of second cathode tabs to a positive terminal;
wherein each of the anodes have a length to width ratio of at least 2 and each of the cathodes have a length to width ratio of at least 2, and the anodes and cathodes are stacked such that their respective length-width planes are substantially planar.

10. The battery pack of claim 9 , wherein the battery pack comprises a power source for an electric or hybrid vehicle.

11. The battery pack of claim 9 , wherein the anode has a length to width ratio of about 2.5 to about 10, and the cathode has a length to width ratio of about 2.5 to about 10.

12. The battery pack of claim 9 , further comprising a separator disposed between the anode and cathode and capable of allowing lithium ion transport between the anode and cathode.

13. The battery pack of claim 9 , wherein the battery pack comprises a lithium-ion battery pack, or a lithium metal battery pack.

14. A battery pack, comprising:
a plurality of stacked battery cells, each cell comprising:
an anode including a length, the length defining an anode first end, coinciding with a battery pack first end, and an anode second end, coinciding with a battery pack second end, a width, a first tab extending from the anode first end, and a second tab extending from the anode second end, and
a cathode and including a length, the length defining a cathode first end, coinciding with the battery pack first end, and a cathode second end, coinciding with the battery pack second end, a width, a first tab extending from the cathode first end, and a second tab extending from the cathode second end,
wherein the first tab of each anode overlaps and contacts the first tab of at least one other anode, the second tab of each anode overlaps and contacts the second tab of at least one other anode, the first tab of each cathode overlaps and contacts the first tab of at least one other cathode, and the second tab of each cathode overlaps and contacts the second tab of at least one other cathode, and wherein each anode has a length to width ratio of at least 2 and each cathode has a length to width ratio of at least 2.

15. The battery pack of claim 14 , wherein at least one pair of overlapping cathode first tabs, cathode second tabs, anode first tabs, or anode second tabs are laser welded or ultrasonically welded.

16. The battery pack of claim 14 , further comprising a separator including a plurality of folds defining a plurality of subsections, wherein each sub section is disposed between two anodes, two cathodes, or an anode and a cathode.

17. The battery pack of claim 14 , wherein each battery cell comprises a lithium battery cell.

18. The battery pack of claim 14 , wherein the battery pack comprises a power source for an electric or hybrid vehicle.

Assignees

• Gm Global Tech Operations Llc

Inventors

• Zeng Sherman
• Que Xiaochao
• Liu Haijing

Classifications

• H01M10/0525 Primary

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M50/548

  on opposite sides of the cell · CPC title

• H01M2/206

  Electricity · mapped topic

• H01M10/0585

  of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators · CPC title

• H01M2/305

  Electricity · mapped topic