A battery module including a battery cell stack in which a plurality of battery cells is stacked, a container filled with a liquid and containing the battery cell stack, and a pressurizer for pressurizing the liquid that is filled in the container. The battery cells are solid-state battery cells. The battery cell stack is packaged with a packaging material. The liquid contains an oil and a heat-absorbing material. The heat-absorbing material has an endothermic reaction initiation temperature of 80? C. or greater and 190? C. or less.

A battery pack supplies an electrically driven treatment apparatus with an electric driving power and includes a plurality of accumulator cells having cell contacts; at least one circuit board electrically connected to the cell contacts; and a battery pack housing having a first battery pack housing part and a second battery pack housing part. The first battery pack housing part and the second battery pack housing part are closed by each other. The accumulator cells are disposed within the battery pack housing. The cell contacts and the circuit board are disposed within the second battery pack housing part. The second battery pack housing part is configured as a mold for a casting compound, and the cell contacts and the at least one circuit board are enclosed by the casting compound.

The present disclosure relates to a battery cell to alleviate the problem of impurities falling into an electrode assembly. Wherein, the battery cell includes: an electrode assembly including a tab and a cell body, wherein the tab is connected to the cell body; a cover plate assembly including an electrode terminal and a cover plate, wherein the electrode terminal is disposed on the cover plate; a connecting sheet connected between the tab and the electrode terminal, the connecting sheet includes a first connecting portion and a second connecting portion, wherein the first connecting portion is connected to the tab, and the second connecting portion is connected to the electrode terminal; an insulating pallet disposed between the cell body and the connecting sheet; and an insulation member disposed between the insulating pallet and the second connecting portion.

An insulation spacer applicable to a battery cell. The battery cell further includes a shell, a first tab, and a second tab of an opposite polarity to the first tab. The first tab is insulated from the shell. The insulation spacer includes a first wall face and a second wall face opposite to each other along a thickness direction of the insulation spacer. A first hole that penetrates the first wall face and the second wall face is created on the insulation spacer. A direction from the first wall face to the second wall face is a first direction. The first hole is configured to be passed through by the first tab along the first direction and enable the first tab to bend to closely fit the second wall face.

An insulation spacer applicable to a battery cell. The battery cell further includes a shell, a first tab, and a second tab of an opposite polarity to the first tab. The first tab is insulated from the shell. The insulation spacer includes a first wall face and a second wall face opposite to each other along a thickness direction of the insulation spacer. A first hole that penetrates the first wall face and the second wall face is created on the insulation spacer. A direction from the first wall face to the second wall face is a first direction. The first hole is configured to be passed through by the first tab along the first direction and enable the first tab to bend to closely fit the second wall face.

An electrochemical apparatus, including: a first electrode assembly including a first negative electrode plate having a first negative current collector with a first negative active material layer disposed on at least one surface; and a second electrode assembly including a second negative electrode plate having a second negative current collector with a second negative active material layer disposed on at least one surface. A coating weight W.sub.1f of the first negative active material layer and a coating weight W.sub.2f of the second negative active material layer satisfy: 30 mg/1540.25 mm.sup.2?W.sub.2f?W.sub.1f?100 mg/1540.25 mm.sup.2. By regulating a value of W.sub.2f?W.sub.1f to be within the above range, energy density of the electrochemical apparatus and swelling performance of the electrochemical apparatus can be improved while fast charging performance is satisfied.

An electrochemical apparatus, including: a first electrode assembly including a first negative electrode plate having a first negative current collector with a first negative active material layer disposed on at least one surface; and a second electrode assembly including a second negative electrode plate having a second negative current collector with a second negative active material layer disposed on at least one surface. A coating weight W.sub.1f of the first negative active material layer and a coating weight W.sub.2f of the second negative active material layer satisfy: 30 mg/1540.25 mm.sup.2?W.sub.2f?W.sub.1f?100 mg/1540.25 mm.sup.2. By regulating a value of W.sub.2f?W.sub.1f to be within the above range, energy density of the electrochemical apparatus and swelling performance of the electrochemical apparatus can be improved while fast charging performance is satisfied.

The present disclosure relates to the technical field of energy storage devices, and in particular, to a secondary battery. The secondary battery includes a case, an electrode assembly, and a top cover assembly. The case has an opening, and the electrode assembly is received in the case. The top cover assembly includes a top cover plate and an electrode terminal disposed on the top cover plate. The top cover plate is disposed at the opening. The connection sheet is connected between the electrode assembly and the electrode terminal. The secondary battery provided by the present disclosure further includes an insulation thermal-dissipation member disposed between the top cover plate and the connection sheet. The insulation thermal-dissipation member has a thermal conductivity larger than 1 W/(m.Math.k).

A jelly roll type electrode assembly a cathode sheet, an anode sheet, and a separator sheet interposed between the cathode sheet and the anode sheet. A separator sheet part facing one end of the cathode sheet located an inner side of the jelly roll type electrode assembly includes a first surface facing the anode sheet and a second surface facing the cathode sheet. A friction coefficient between the first separator sheet and the anode sheet is smaller than a friction coefficient between the second surface of the separator sheet and the cathode sheet.

A jelly roll type electrode assembly a cathode sheet, an anode sheet, and a separator sheet interposed between the cathode sheet and the anode sheet. A separator sheet part facing one end of the cathode sheet located an inner side of the jelly roll type electrode assembly includes a first surface facing the anode sheet and a second surface facing the cathode sheet. A friction coefficient between the first separator sheet and the anode sheet is smaller than a friction coefficient between the second surface of the separator sheet and the cathode sheet.