Abstract: A battery module includes multiple cells and a bracket. The multiple cells are stacked along a first direction. Each cell includes a first terminal and a second terminal. The bracket includes multiple groups of through-holes. Each group of through-holes includes a first terminal through-hole and a second terminal through-hole. The first terminal and the second terminal of a same cell pass through the first terminal through-hole and the second terminal through-hole in a same group of through-holes. The multiple groups of through-holes include a first group of through-holes, a second group of through-holes, and third groups of through-holes. Along the first direction, a distance D1 between the first terminal through-hole in the first group of through-holes and the second terminal through-hole in a third group of through-holes adjacent to the first group of through-holes is greater than a distance D3 between two adjacent third groups of through-holes.

Abstract: A method for managing charging and discharging of a parallel-connected battery pack, including: obtaining a voltage value and a state of charge of a plurality of battery packs; comparing the voltage value and the state of charge of each of the battery packs with a reference voltage value and a reference state of charge; and managing charging and discharging of the plurality of battery packs based on a comparison result. The method can enhance automation of paralleling of battery packs, increase adaptability of a paralleling system, improve paralleling efficiency, further reduce operation and maintenance costs, and improve user experience.

Abstract: A battery discharge undervoltage protection method includes: acquiring a temperature and a first voltage of a battery; determining, based on the temperature, a depth of discharge of the battery; determining, based on the first voltage, a first remaining capacity proportion of the battery; and determining, based on the first remaining capacity proportion, the depth of discharge and a first undervoltage threshold, a second undervoltage threshold to increase a discharge capacity proportion of the battery, the first undervoltage threshold is a preset undervoltage threshold, and the second undervoltage threshold is a dynamically adjusted undervoltage threshold.

Abstract: A battery pack includes an upper shell, a lower shell, a battery cell assembly, a circuit board and a first component. The lower shell is provided with a battery cavity, the battery cell assembly is disposed in the battery cavity, the circuit board is connected to the battery cell assembly, the circuit board is located between the upper shell and the lower shell, the first component is provided with a first through hole running through the first component, the first through hole is located between the circuit board and the battery cell assembly, and the first through hole communicates with external air.

Abstract: A battery pack includes a housing, a plurality of cells disposed in the housing, and a supporting piece. The plurality of cells are stacked in a first direction, the supporting piece is disposed between two cells, and the supporting piece includes a first supporting portion and a second supporting portion arranged opposite each other. In a second direction, the housing includes a first protrusion and a second protrusion, the supporting piece is disposed between the first protrusion and the second protrusion, the first supporting portion is connected to the first protrusion and the second supporting portion is connected to the second protrusion, and the second direction is a width direction of the housing.

Abstract: A battery module includes a shell, a battery cell assembly disposed in the shell, a circuit board, a conductive assembly, and a first structural member. The circuit board is electrically connected to the battery cell assembly; the conductive assembly is electrically connected to the circuit board, and the conductive assembly includes a first conductive member and a second conductive member; and the first structural member is disposed on a side of the battery cell assembly adjacent to the conductive assembly, and the first structural member is movable in a first direction, such that the first conductive member is connected to or separated from the second conductive member, the first direction being a direction from the battery cell assembly to the circuit board.

Abstract: A battery module including a battery unit and a conductive unit. The battery unit includes at least one cell, and each cell of the battery unit includes a first tab and a second tab having opposite polarities. The conductive unit includes a first conductive member and a second conductive member spaced apart from the first conductive member in a thickness direction of the cell, the first conductive member is electrically connected with the first tab of any cell, and the second conductive member is electrically connected with the second tab of any cell. The battery module is configured that the first conductive member and the second conductive member are in conductive contact through the swelling of the cell.

Abstract: A box body a high-voltage box apparatus, an energy storage device, and electric equipment. The high-voltage box apparatus includes a functional module and the box body is configured to the functional module is installed. The box body includes a housing, a support, and a tray assembly, The support is disposed inside the housing, and the tray assembly is movably disposed on the support. The housing is provided with a first opening thereon, and the tray assembly is movable between a first position and a second position relative to the support, the tray assembly is at least partially movable out of the housing through the first opening. The tray assembly is configured for fixing the functional module.

Abstract: An electrochemical device, a battery pack, and an electrical device to alleviate the problem of inferior mechanical properties of existing electrochemical devices. The electrochemical device provided includes a body and a first protector. The first protector is disposed at an end of the body, where the end is provided with the tab. A part of the tab is disposed in the first protector, and another part of the tab extends out of the first protector.

Abstract: A master-slave dynamic paralleling method for battery packs, includes: during discharging, discharging a battery pack with the highest power, and when a voltage difference between battery packs reaches a preset threshold range and no fault protection state is triggered, parallel-connecting a battery pack to the lowest power for discharging, and performing paralleling mode switching; and during charging, charging a battery pack with the lowest voltage, and when voltages of all battery packs are consistent and no fault protection state is triggered, parallel-connecting another battery pack for charging, and performing paralleling mode switching.

Abstract: An electrochemical apparatus includes a battery management system, a battery unit, and a switch unit. The switch unit is electrically connected between the battery management system and the battery unit. The battery management system is configured to obtain a state of charge of the battery unit; and under a condition that the state of charge is less than a preset threshold and the electrochemical apparatus has not obtained a charging current transmitted by an external charging device, the battery management system outputs a first signal to the switch unit, and the switch unit switches off an electrical connection between the battery unit and the battery management system according to the first signal.

Abstract: An electrochemical including an electrode assembly. The electrode assembly includes a negative electrode plate, a positive electrode plate, and a separator. The negative electrode plate includes a negative current collector. The negative current collector includes a first part and a second part. A first negative active material layer is disposed on one side of the first part. A second negative active material layer and a third negative active material layer are disposed on two sides of the second part respectively. The positive electrode plate includes a positive current collector. The positive current collector includes a third part and a fourth part. A first positive active material layer is disposed on the third part. A second positive active material layer is disposed on the fourth part.

Abstract: A battery pack including a battery module, a first housing, and a second housing, the first housing and the second housing forming an accommodating space for accommodating the battery module. The first housing includes a first edge portion, the first edge portion is provided with a first groove, a first resin layer is provided in the first groove, and the first resin layer is adhesively fixed to an inner wall of the first groove. The second housing includes a second edge portion. The first resin layer is provided between the first housing and the second housing and is connected to the second edge portion, and the first resin layer within the first groove is in a compressed state, with a compression amount of 20% to 30% of a length of the first resin layer in natural state.

Abstract: A battery pack is disclosed, including a cover plate, a cell module, a second resin layer, a battery pack housing, and an insulation assembly. The cell module is accommodated in the battery pack housing and fixed by the second resin layer. The cell module includes a plurality of cells. Each of the cells includes a first end and a second end disposed opposite to each other along a first direction. The insulation assembly is disposed at second ends of at least two of the cells. The insulation assembly and the second ends of the at least two cells form a first space. The first space communicates with a clearance between the at least two cells. The insulation assembly closes off one side of the first space. The insulation assembly and the first space form an exhaust passage. The exhaust passage communicates with an outside of the battery pack.

Abstract: A method for manufacturing a battery module, including: disposing an adapting plate on a battery cell assembly, and connecting the adapting plate to tabs of the battery cell assembly; providing a fastening frame, where the fastening frame is provided with an accommodating cavity, and the accommodating cavity accommodates the adapting plate and at least part of the battery cell assembly; and providing a filler in a gap between the inner side of the accommodating cavity and the battery cell assembly and a gap between the inner side of the accommodating cavity and the adapting plate.

Abstract: A battery pack includes a housing, a battery module, and a resin layer. At least one side of the housing is provided with a through-hole. The battery module is accommodated in an accommodation cavity formed by the housing. The resin layer is disposed on a lower part of a side end of the battery module, and covers package parts of side ends of all cells. The side end of the battery module is the side ends of the plurality of cells in the battery module, and a channel is disposed between the through-hole and a space enclosed by the resin layer and the battery module. Based on this, this application can protect the package parts, and avoid corrosion of exposed metal at the package parts. Moreover, the resin layer can conduct, to the outside through the through-hole, heat produced by the cells, thereby facilitating heat dissipation.

Abstract: A battery cell is disclosed having a cathode including a cathode substrate with a surface coating of a first cathode active material in a first cathode region and a second cathode active material in a second cathode region, an anode including an anode substrate having a surface coating of a first anode active material in a first anode region and a second anode active material in a second anode region, wherein a value CB1 is a ratio of a unit area capacity CsA1 of the first anode region to a unit area capacity Csc1 of the first cathode region, a value CB2 is a ratio of a unit area capacity CsA2 of the second anode region to a unit area capacity Csc2 of the second cathode region, wherein the surface coating of the cathode and/or anode is a partitioned coating including different active materials, and wherein CB2?CB1.

Abstract: A battery pack includes a cell module, a covering, a first resin layer, and at least one first structural member. The cell module includes a plurality of cell assemblies stacked along a first direction, a first surface, a second surface, a first lateral face and a second lateral face, a first region and a second region located on two sides of the covering respectively along a second direction. The covering includes a first section, a second section, and a third section. The first section covers at least a part of the first lateral face. The second section covers at least a part of the second lateral face. The third section covers the first surface. The first resin layer is disposed in the first region. The first structural member is disposed between two adjacent cell assemblies to partition the two adjacent cell assemblies.

Abstract: A battery module includes: a housing, a cell assembly, and a plurality of first busbars. The housing defines an accommodation cavity. The housing includes a first housing and a second housing. The first housing is fixed to the second housing. The first housing and the second housing together form the accommodation cavity. The cell assembly includes a plurality of battery cells. Each battery cell includes a packaging shell and an electrode disposed on an outer side of the packaging shell. The electrode includes a first electrode terminal and a second electrode terminal. The first housing includes a first top wall and a plurality of first sidewalls connected to the first top wall. The first top wall includes a first through-hole. The plurality of first busbars are disposed on the first top wall. The plurality of first busbars are connected to the first electrode terminals through the first through-hole.

Abstract: A battery module including a cell assembly and a first circuit board. The cell assembly includes a plurality of battery cells. The plurality of battery cells are connected to the first circuit board. The plurality of battery cells include a first battery cell and a second battery cell, and the first battery cell is inclined with respect to the second battery cell. The first circuit board is disposed between the first battery cell and the second battery cell, the first circuit board is inclined with respect to the first battery cell, and the first circuit board is inclined with respect to the second battery cell. In the battery module, the space inside a battery is sufficiently utilized by disposing the first circuit board in the space between the first battery cell and the second battery cell, thereby effectively improving an energy density.