A battery pack is a battery pack for an electric tool. The battery pack is attachable to a tool body. The tool body includes a tool attachment part to which a tool is to be attached and a driver configured to drive the tool. The battery pack includes an electricity accumulator, a battery case, and a cushioning structure. The electricity accumulator includes an all-solid-state battery. The electricity accumulator is configured to accumulate electric power to be supplied to the driver. The battery case houses the electricity accumulator. The cushioning structure is configured to suppress acceleration acting on the electricity accumulator from being changed.

A battery module has a structure capable of preventing spread of flames when fire breaks out in the battery module, and more particularly a battery module including a plurality of battery cell module assemblies, each of the battery cell module assemblies including battery cells arranged in tight contact with each other, a side plate electrically connected to electrode leads of the battery cell module assemblies, a duct disposed outside the side plate, and a gas cutoff structure disposed in the duct, wherein the plurality of battery cell module assemblies is disposed so as to have a space therebetween.

An energy storage system includes a pair of rack frames spaced apart from each other and arranged side by side; a plurality of L brackets fastened to the rack frames; a plurality of battery modules respectively placed on a pair of L brackets facing each other to form a plurality of layers along a longitudinal direction of the rack frame; a first heat transfer member interposed between the battery module and the L bracket; and a second heat transfer member interposed between the rack frame and the L bracket.

An energy storage system includes a pair of rack frames spaced apart from each other and arranged side by side; a plurality of L brackets fastened to the rack frames; a plurality of battery modules respectively placed on a pair of L brackets facing each other to form a plurality of layers along a longitudinal direction of the rack frame; a first heat transfer member interposed between the battery module and the L bracket; and a second heat transfer member interposed between the rack frame and the L bracket.

Disclosed are a battery box, a battery cell, a battery, and a method and apparatus for preparing the battery box. The battery box includes a pressure relief region including a first recess arranged at an inner surface of the battery box and a second recess arranged at an outer surface of the battery box, the first recess being arranged opposite to the second recess, wherein a third recess is provided at a bottom wall of the first recess and/or a bottom wall of the second recess, and the pressure relief region is configured to fracture at the third recess, when an internal pressure of the battery box reaches a threshold, to relieve the internal pressure. According to the battery box, the battery cell, the battery, and the method and apparatus for preparing the battery box disclosed in the present application, the pressure relief region is easy to machine.

Disclosed are a battery box, a battery cell, a battery, and a method and apparatus for preparing the battery box. The battery box includes a pressure relief region including a first recess arranged at an inner surface of the battery box and a second recess arranged at an outer surface of the battery box, the first recess being arranged opposite to the second recess, wherein a third recess is provided at a bottom wall of the first recess and/or a bottom wall of the second recess, and the pressure relief region is configured to fracture at the third recess, when an internal pressure of the battery box reaches a threshold, to relieve the internal pressure. According to the battery box, the battery cell, the battery, and the method and apparatus for preparing the battery box disclosed in the present application, the pressure relief region is easy to machine.

This disclosure details exemplary battery pack designs for use in electrified vehicles. Exemplary battery packs may include a battery array that includes one or more interconnected array frames. A split thermal fin may be held within the one or more array frames. The proposed designs of the split thermal fin enable a reduction of the amount of thermal interface material required between the thermal fin and a support structure (e.g., a heat exchanger plate) of the battery pack.

This disclosure details exemplary battery pack designs for use in electrified vehicles. Exemplary battery packs may include a battery array that includes one or more interconnected array frames. A split thermal fin may be held within the one or more array frames. The proposed designs of the split thermal fin enable a reduction of the amount of thermal interface material required between the thermal fin and a support structure (e.g., a heat exchanger plate) of the battery pack.

Presented are thermomechanical fuses for mitigating heat propagation across electrochemical devices, methods for making and methods for using such fuses, and traction battery packs with load-bearing, sacrificial thermomechanical fuses to help prevent thermal runaway conditions. A battery assembly includes an electrically insulating battery housing with multiple battery cells disposed inside the battery housing. These battery cells are electrically interconnected, in series or parallel, and stacked in side-by-side facing relation to form adjacent, mutually parallel stacks of battery cells. Thermomechanical fuses thermally connect neighboring stacks of the battery cells. Each thermomechanical fuse is formed, in whole or in part, from a dielectric material that undergoes deterioration or deformation at a predefined critical temperature; in so doing, the thermomechanical fuse thermally disconnects a first stack of cells from a neighboring second stack of cells.

A heating sheet and a battery module are provided. The battery module includes multiple battery cells and a heating sheet. The heating sheet includes multiple heating units and multiple connection units, and two adjacent heating units are coupled with each other through a connection unit. One heating unit may be attached to a side wall of one battery cell, and the connection unit corresponds to the gap region.