Electrical energy storage unit and battery

FR3168692A1Pending Publication Date: 2026-05-22COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
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Patent Information

Authority / Receiving Office
FR · FR
Patent Type
Applications
Current Assignee / Owner
COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
Filing Date
2024-11-20
Publication Date
2026-05-22

AI Technical Summary

Technical Problem

Existing electrical energy storage units face challenges in maintaining effective thermal protection and electrical insulation under varying temperature conditions, particularly between 60°C and 100°C, without compromising the functionality and safety of the unit.

Method used

Incorporating a spring-based elastic element and a polymer third element positioned between conductive elements, with a protection system that includes a retaining element and a switching device, to manage temperature thresholds and ensure electrical insulation and contact, using a shrinkable polymer for thermal expansion management.

Benefits of technology

The solution provides enhanced thermal protection and electrical insulation, maintaining safety and functionality across temperature fluctuations by ensuring the polymer element moves between insulated and conductive states, thereby preventing damage and ensuring reliable operation.

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Abstract

Title: Electrical Energy Storage Unit and Battery The invention relates to an electrical energy storage unit (1), comprising first (11) and second (12) electrical terminals, a accumulator (13) electrically coupled to the first and second terminals, and a short-circuit type protection system (14), the latter comprising: a first electrically conductive element (141) coupled to the first terminal, a second electrically conductive element (142) coupled to the second terminal, and an electrically conductive elastic element (1421) coupled to the second element characterized in that the protection system comprises a third electrically insulating and thermo-deformable element (143), the latter being configured to occupy a first state in which the third element electrically isolates the elastic element from the first element, and to occupy a second state, in which the third element deforms so that the elastic element comes into contact with the first element.Figure for the summary: Fig. 2.
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Description

[Claim 3] An electrical energy storage unit (1) according to any one of the preceding claims, wherein when the third element (143) is in the first state, the third element (143) is positioned between the elastic element (1421) and the first element (141). [Claim 4] An electrical energy storage unit (1) according to any one of the preceding claims, wherein the elastic element (1421) comprises a spring.[Claim 5] An electrical energy storage unit (1) according to any one of the preceding claims, wherein the elastic element (1421) comprises at least one movable part that moves relative to the first element (141) between a first position, in which the third element (143) is in the first state and said at least one movable part is electrically insulated from the first element (141), and a second position, in which the third element (143) is in the second state and said at least one movable part is in contact with the first element (141). [Claim 6] An electrical energy storage unit (1) according to any one of the preceding claims, wherein the temperature threshold is between 60°C and 100°C, preferably between 60°C and 80°C.[Claim 7] An electrical energy storage unit (1) according to any one of the preceding claims, wherein the third element (143) is a polymer, for example, a polymer taken from polyolefin, low-density polyethylene, ethylene copolymers, or propylene copolymers. [Claim 8] An electrical energy storage unit (1) according to any one of claims 1 to 7, wherein the third element (143) is a shrinkable polymer. [Claim 9] An electrical energy storage unit (1) according to the preceding claim, wherein the protection system (14) comprises a retaining element (143c) configured to mechanically hold the third element (143) in contact with the first conductive element (141).[Claim 10] Electrical energy storage unit (1) according to any one of the preceding claims, wherein, the protection system (14) comprises a switching device (15), the switching device (15) having two electrically coupled terminals, either respectively with the first power terminal (11) and the first element (141), or respectively with the second power terminal (12) and the.

Claims

second element (142), the switching device (15) being configured so as to melt to open the circuit between its terminals when the temperature of the third element (143) is strictly above the temperature threshold.

11. Electrical energy storage unit (1) according to the preceding claim, wherein the protection system (14) comprises a resistor (16), the resistor (16) being electrically coupled in parallel with the two terminals of the switching device (15), the resistor (16) being configured so as to discharge the accumulator (13) when the switching device (15) has melted to open the circuit between its terminals.

12. Electrical energy storage unit (1) according to the preceding claim, wherein the resistor (16) is positioned in thermal contact with the third element (143).

13. Electrical energy storage unit (1) according to claim 11, wherein the resistor (16) is positioned in thermal contact with the second element (142).

14. Electrical energy storage unit (1) according to any one of the three preceding claims, wherein the resistor (16) is of the temperature coefficient resistor type and is configured so as to have a transition temperature above the temperature threshold.

15. Battery (2) comprising a plurality of electrical energy storage units (1) according to any one of the preceding claims, the electrical energy storage units (1) being electrically coupled to each other by their first (11) and second (12) respective power terminals.

16. Battery (2) according to the preceding claim, wherein each protection system (14) includes a cut-off device (15).

17. Battery (2) according to the preceding claim, wherein each protection system (14) includes a resistor (16). AA ■ BPS FIG. 2 [Fig. 3C] FIG. 3C b / n i gP2 FIG. 4A FIG. 4B 9 / n 2 BPI FIG. 5B [Fig. 6A] FIG. 6A FIG. 6B