Overcharge protection device with uneven terminal pads

Patent metadata

Field	Value
Publication number	US-11539103-B2
Application number	US-201816764324-A
Country	US
Kind code	B2
Filing date	Nov 20, 2018
Priority date	Nov 20, 2017
Publication date	Dec 27, 2022
Grant date	Dec 27, 2022

Abstract

An overcharge protection device cover assembly for use with a battery cell housing. The battery cell housing has a first terminal and a second terminal, the overcharge protection device cover assembly including a first terminal pad having a first length. The first terminal pad is contactable with the first terminal of the battery cell housing. The assembly also includes a second terminal pad having a second length that is greater than the first length. The second terminal pad is contactable with the second terminal of the battery cell housing. A reversal device of the assembly is deflectable toward the first and second terminal pads. A conductive element of the assembly is positioned between the reversal device and the first and second terminal pads.

First claim

The invention claimed is:

1. An overcharge protection device cover assembly for use with a battery cell housing, the battery cell housing having a first terminal and a second terminal, the overcharge protection device cover assembly comprising:
a first terminal pad having a first end portion and a second end portion opposite the first end portion, the first end portion and the second end portion defining an LFP distance and the first terminal pad being contactable with the first terminal of the battery cell housing;
a second terminal pad having a third end portion and a fourth end portion opposite the third end portion, the third end portion and the fourth end portion defining an LSP distance that is greater than the LFP distance, the second terminal pad being contactable with the second terminal of the battery cell housing;
a reversal device that is deflectable toward the first and second terminal pads, wherein the reversal device is transitionable between a first configuration and a second configuration, wherein the first terminal pad is a DFP distance from the reversal device to a bottom surface of the first terminal pad when the reversal device is in the first configuration and the second terminal pad is a DSP distance from the reversal device to a bottom surface of the second terminal pad when the reversal device is in the first configuration, and wherein the DFP distance and the DSP distance are different from one another; and
a conductive element between the reversal device and the first and second terminal pads.

2. The overcharge protection device cover assembly of claim 1 , wherein
the first end portion of the first terminal pad is contactable with the first terminal of the battery cell housing and the first end portion of the second terminal pad is contactable with the second terminal of the battery cell housing.

3. The overcharge protection device cover assembly of claim 2 , wherein the first terminal pad includes a first pivot point about which the first terminal pad is pivotable and the second terminal pad includes a second pivot point about which the second terminal pad is pivotable.

4. The overcharge protection device cover assembly of claim 3 , further comprising:
a base plate, the base plate defining the reversal device; and
a spacer plate between the base plate and the first terminal pad.

5. The overcharge protection device cover assembly of claim 4 , wherein the second end portion of the first terminal pad and the second end portion of the second terminal pad are each movable in a direction that is orthogonal to a plane of the base plate.

6. The overcharge protection device cover assembly of claim 1 , wherein the DFP distance is greater than the DSP distance.

7. The overcharge protection device cover assembly of claim 6 , wherein each of the first and second terminal pads includes a working thickness, the working thickness of the first terminal pad and the working thickness of the second terminal pad being the same.

8. The overcharge protection device cover assembly of claim 6 , wherein the first terminal pad includes a first working thickness and the second terminal pad includes a second working thickness that is greater than the first working thickness.

9. The overcharge protection device cover assembly of claim 6 , wherein transition of the reversal device from the first configuration to the second configuration causes the conductive element to contact the second terminal pad before the conductive element contacts the first terminal pad.

10. An overcharge protection device cover assembly, the overcharge protection device cover assembly comprising:
a base plate including a reversal device, the reversal device being transitionable between a first configuration and a second configuration;
a first terminal pad having a first end portion and a second end portion opposite the first end portion, the first end portion and the second end portion defining an LFP distance;
a second terminal pad having a third end portion and a fourth end portion opposite the third end portion, the third end portion and the fourth end portion defining an LSP distance that is greater than LFP distance;
a conductive element between the reversal device and the first and second terminal pads, the conductive element being separate from the first and second terminal pads; and
a spacer plate between the base plate and the first terminal pad,
the first terminal pad being a DFP distance from a top surface of the base plate to a bottom surface of the first terminal pad when the reversal device is in the first configuration and the second terminal pad being a DSP distance from a top surface of the base plate to a bottom surface of the second terminal pad when the reversal device is in the first configuration, the distance DFP distance being greater than the DSP distance.

11. The overcharge protection device cover assembly of claim 10 , wherein each of the first and second terminal pads includes a working thickness, the working thickness of the first terminal pad and the working thickness of the second terminal pad being the same.

12. The overcharge protection device cover assembly of claim 10 , wherein the first terminal pad includes a first working thickness and the second terminal pad includes a second working thickness that is greater than the first working thickness.

13. The overcharge protection device cover assembly of claim 10 , wherein transition of the reversal device from the first configuration to the second configuration causes the conductive element to contact the second terminal pad before the conductive element contacts the first terminal pad.

14. A battery cell comprising:
a battery cell housing, the battery cell housing including first terminal and a second terminal; and
an overcharge protection device cover assembly affixable to the battery cell housing, the overcharge protection device cover assembly including:
a base plate coupled to the battery cell housing between the first and second terminals, the base plate having a reversal device that is transitionable between a first configuration and a second configuration;
a first terminal pad having a first end portion, a second end portion opposite the first end portion, and an LFP distance between the first end portion and the second end portion, the first end portion of the first terminal pad being in contact with the first terminal;
a second terminal pad having a first end portion, a second end portion opposite the first end portion, an LSP distance between the first end portion and the second end portion, wherein the LSP distance is greater than the LFP distance, the first end portion of the second terminal pad being in contact with the second terminal;
a conductive element between the reversal device and the first and second terminal pads; and
a spacer plate between the base plate and the first terminal pad,
the first terminal pad being a DFP distance from a top surface of the base plate to a bottom surface of the first terminal pad when the reversal device is in the first configuration and the second terminal pad being a DSP distance from a top surface of the base plate to a bottom surface of the second terminal pad when the reversal device is in the first configuration, the DFP distance being greater than the DSP distance.

15. The battery cell of claim 14 , wherein the second end portion of each of the first and second terminal pads includes a working thickness, the working thickness of the second end portion of the first terminal pad and the working thickness of the second end portion of the second terminal pad being the same.

Assignees

• Cps Tech Holdings Llc

Inventors

• Zhang Xugang
• Fuhr Jason D

Classifications

• H01M50/55

  on the same side of the cell · CPC title

• H01M50/578 Primary

  in response to pressure · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M2200/20

  Pressure-sensitive devices · CPC title

• H01M50/553

  Terminals adapted for prismatic, pouch or rectangular cells · CPC title