Patent ID: 11881594
Assignee: TECHTEST LIMITED
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A battery pack for powering an electrical device, comprising:
a housing configured to receive a plurality of electrochemical cells, each having an elongate body with terminals of opposite polarity at either end thereof; and
electrical circuitry configured to couple in series or parallel the plurality of electrochemical cells in the housing to electrical contacts of the electrical device;
wherein the housing comprises:
a first part having a body defining a chamber with an opening, the body being configured to retain the plurality of electrochemical cells side by side in the chamber, with one terminal of each cell facing towards the opening, with an end of the chamber opposite the opening being configured to resist any pressure build up inside the chamber; and
a second part comprising a filter and at least one vent, the filter being a multilayer filter comprising metal, with the second part being configured to cover the opening of the chamber when coupled to the first part such that any combustion gases generated in the chamber by electrochemical cell malfunction pass through the opening and the multilayer filter before being vented externally of the housing through the at least one vent, and with the multilayer filter being configured to: contain shrapnel generated by catastrophic failure of at least one of the plurality of electrochemical cells during a thermal runaway event; and absorb thermal energy from combustion gases passing therethrough to suppress flames exiting the at least one vent by reducing temperatures of combustion gases below their ignition temperature;

wherein the electrical circuitry is configured such that when the plurality of electrochemical cells are retained side by side in the chamber, the tenninals of all the plurality of electrochemical cells facing towards the opening have a common polarity.