A cell, a battery pack, and an electric vehicle are provided in the present disclosure. The cell includes a hermetical metal housing and at least two hermetical accommodating cavities, multiple electrode core assemblies, and an encapsulation film arranged in the metal housing. The electrode core assemblies are arranged along a first direction. The electrode core assemblies are connected in series. A length of each electrode core assembly extends along the first direction. The electrode core assembly includes an electrode core assembly body and a first electrode and a second electrode configured to lead out a current. The first electrode and the second electrode are respectively arranged on two sides of the electrode core assembly body along the first direction. At least one of the accommodating cavities is defined by the encapsulation film, and the electrode core assembly body is arranged in the accommodating cavity. A length of the cell extends along the first direction. The length of the cell ranges from 400 mm to 2500 mm. A thickness of the cell extends along a second direction perpendicular to the first direction. A ratio of the length to the thickness of the cell ranges from 5 to 250.

A battery, a battery module, a battery pack, and an electric vehicle are provided. The battery includes a metal shell and a plurality of electrode core assemblies sealed in the metal shell and arranged in sequence. The electrode core assemblies are connected in series. Each of the electrode core assemblies includes at least one electrode core. The electrode core assemblies are sealed in a packaging film. An air pressure between the metal shell and the packaging film is lower than an air pressure outside the metal shell. An air pressure inside the packaging film is lower than the air pressure between the metal shell and the packaging film.

A battery, a battery module, a battery pack, and an electric vehicle are provided. The battery includes a metal shell and a plurality of electrode core assemblies sealed in the metal shell and arranged in sequence. The electrode core assemblies are connected in series. Each of the electrode core assemblies includes at least one electrode core. The electrode core assemblies are sealed in a packaging film. An air pressure between the metal shell and the packaging film is lower than an air pressure outside the metal shell. An air pressure inside the packaging film is lower than the air pressure between the metal shell and the packaging film.

A battery module includes batteries, bus bars, a flexible flat cable and connecting terminals. Each battery includes a first electrode and a second electrode. Each bus bar connects the first electrode of one battery with the second electrode of another battery. At least one of the bus bar is arranged obliquely. The flexible flat cable includes a number of wires arranged in parallel. Each connecting terminal includes a first connecting portion connected to a corresponding bus bar and a second connecting portion connected to a corresponding wire of the flexible flat cable. Compared with the prior art, at least one of the bus bars of the present disclosure is arranged obliquely, thereby reducing the difficulty of arranging the batteries. In addition, by providing the first connecting portion and the second connecting portion, it is convenient to realize the assembly of the battery module.

A battery connection module includes a carrying tray, a plurality of busbars, a flexible circuit board and at least one temperature sensing construction, the plurality of busbars are assembled on the carrying tray and are used to connect the plurality of batteries in series; the flexible circuit board is assembled on the carrying tray and includes a plurality of flexible supporting arms which extend from the flexible circuit board to connect the plurality of busbars, the temperature sensing construction includes a first flexible supporting arm, a first busbar, a temperature sensor and a first metal bridging piece, the first flexible supporting arm is one of the plurality of flexible supporting arms and the first busbar is one of the plurality of busbars, the first busbar has a depressed portion close to the flexible circuit board, a tip of the flexible supporting arm has a setting surface which is used to provide the temperature sensor thereon, the temperature sensor is directly positioned above the depressed portion, the first metal bridging piece includes a first end and a second end, the first end is connected to the setting surface of the tip of the flexible supporting arm, the second end is connected to the first busbar.

A battery connection module includes a carrying tray, a plurality of busbars, a flexible circuit board and at least one temperature sensing construction, the plurality of busbars are assembled on the carrying tray and are used to connect the plurality of batteries in series; the flexible circuit board is assembled on the carrying tray and includes a plurality of flexible supporting arms which extend from the flexible circuit board to connect the plurality of busbars, the temperature sensing construction includes a first flexible supporting arm, a first busbar, a temperature sensor and a first metal bridging piece, the first flexible supporting arm is one of the plurality of flexible supporting arms and the first busbar is one of the plurality of busbars, the first busbar has a depressed portion close to the flexible circuit board, a tip of the flexible supporting arm has a setting surface which is used to provide the temperature sensor thereon, the temperature sensor is directly positioned above the depressed portion, the first metal bridging piece includes a first end and a second end, the first end is connected to the setting surface of the tip of the flexible supporting arm, the second end is connected to the first busbar.

To provide a heat insulation sheet for a battery pack that has a good shape retention property and can maintain an excellent heat insulation property even when vibration or pressure is applied, and a battery pack in which a heat insulation sheet for a battery pack is interposed between battery cells. A heat insulation sheet (10) of the present invention is a heat insulation sheet for a battery pack, the heat insulation sheet being interposed between battery cells in a battery pack in which a plurality of battery cells is connected in series or in parallel. The heat insulation sheet (10) includes: a first heat insulation material (21) containing a silica nanoparticle; and a second heat insulation material (22) containing a plate-shaped particle containing a silica component and having a curved surface.

To provide a heat insulation sheet for a battery pack that has a good shape retention property and can maintain an excellent heat insulation property even when vibration or pressure is applied, and a battery pack in which a heat insulation sheet for a battery pack is interposed between battery cells. A heat insulation sheet (10) of the present invention is a heat insulation sheet for a battery pack, the heat insulation sheet being interposed between battery cells in a battery pack in which a plurality of battery cells is connected in series or in parallel. The heat insulation sheet (10) includes: a first heat insulation material (21) containing a silica nanoparticle; and a second heat insulation material (22) containing a plate-shaped particle containing a silica component and having a curved surface.

A cell equalization system includes: a battery including a plurality of chargeable cells connected in series and mounted on a vehicle; a battery ECU configured to control the battery; an equalization circuit configured to perform equalization of remaining capacity variation of the plurality of cells; and an equalization control unit configured to control the equalization circuit. The battery ECU is configured to calculate the remaining capacity variation at startup of ECU in which the battery ECU changes from a sleep state to a startup state. The cell equalization system is configured to execute first equalization processing for performing the equalization when the battery ECU is in the startup state, and second equalization processing for performing the equalization when the battery ECU is in the sleep state.

A cell equalization system includes: a battery including a plurality of chargeable cells connected in series and mounted on a vehicle; a battery ECU configured to control the battery; an equalization circuit configured to perform equalization of remaining capacity variation of the plurality of cells; and an equalization control unit configured to control the equalization circuit. The battery ECU is configured to calculate the remaining capacity variation at startup of ECU in which the battery ECU changes from a sleep state to a startup state. The cell equalization system is configured to execute first equalization processing for performing the equalization when the battery ECU is in the startup state, and second equalization processing for performing the equalization when the battery ECU is in the sleep state.