Abstract: A battery module includes n batteries, n?3. The n batteries are stacked in a sequence along a thickness direction of the battery, and m is defined as a round number of n/2, and the first battery and the m-th battery satisfy at least one of the following conditions: a1: a capacity of the m-th battery is greater than that of the first battery; b1: under a same state of charge, an open circuit voltage of the m-th battery is less than that of the first battery; and c1 under a same state of charge, an AC impedance of the m-th battery is less than that of the first battery.

Abstract: A battery cell module includes a plurality of battery cells stacked in a first direction, and a first groove extending in the first direction is formed at each of two ends of the first side of the battery cell module. In a second direction, the two first side covers are arranged at two opposite sides of the battery cell module. First bodies of the two first side covers are substantially parallel to a third direction of the battery cell module, and each of the first side covers is provided with an abutting part. The abutting part extends from an edge of the first side cover and is substantially perpendicular to the first body and is connected to a groove wall of the first groove .The two second side covers and the two first side covers are fastened to each other. The abutting part is inserted into the first groove.

Abstract: A battery module includes a plurality of battery units and at least one bus bar, where each of the battery units includes a first frame and a battery cell, the first frame is provided with an accommodating space for accommodating the battery cell, the battery cell includes an encapsulating case and an electrode terminal extending out of the encapsulating case. Each battery unit further includes at least one conductive sheet, the conductive sheet is disposed on the first frame, the electrode terminal of the battery cell is connected to the conductive sheet, and the bus bar is connected to conductive sheets of two adjacent battery units. With the conductive sheet provided on the first frame, the bus bar is connected to conductive sheets of two adjacent battery units to implement series-parallel connection and assembly between battery cells on different first frames, so that the entire battery module can be connected.

Abstract: A battery proofed against short circuiting, for better safety, includes a battery cell and a first set of electrode tabs. The battery cell includes a first electrode plate and a second electrode plate. The first set of electrode tabs is electrically connected to the first electrode plate. The first set of electrode tabs includes a first bending portion, an edge of the second electrode plate defines a first receiving groove, and the first receiving groove corresponds to the first bending portion.

Abstract: A package housing including a first end plate and a second end plate disposed opposite to the first end plate, and a first side plate and a second side plate disposed opposite to the first side plate. The first and second side plates is disposed between the first and second end plates, the first end plate is provided with a first through hole, the first side plate is provided with a protrusion passing through the first through hole. A fixing member detachably fixes the first end plate with the first side plate. The present application further provides a battery pack. The purpose of the present application is to solve at least the assembly difficulty of the soft-packaged lithium battery module in the case of a small assembly space, so as to improve the assembly convenience of the soft-packaged lithium battery module.

Abstract: A battery pack includes a housing, a battery cell assembly, a first separator, a pressure relief portion, and glue. The first separator is disposed between the housing and a first side of the battery cell assembly, and is deformed when a temperature is higher than a first threshold. The glue fills a clearance between the housing and at least a partial area outside the first side of the battery cell assembly and is configured to fasten the battery cell assembly to the housing. When thermal runaway occurs in the battery pack, the first separator is thermally deformed to form a first pressure relief channel between the housing and the first side of the battery cell assembly. Then, high-temperature gas can smoothly escape from the battery pack through the first pressure relief channel and the pressure relief portion.

Abstract: An electrochemical apparatus includes a first electrode plate, a second electrode plate, a first separator, and a second separator, the first separator includes a first porous substrate, the second electrode plate includes a second porous substrate, and the first electrode plate, the first separator, the second electrode plate and the second separator are stacked in sequence to form an electrode assembly; and at least one surface of the first porous substrate is provided with a polymer bonding layer, and at least one surface of the second porous substrate is provided with no polymer bonding layer. A new electrode assembly structure separate a positive electrode plate and a negative electrode plate through a first separator provided with a polymer binder, which is beneficial to shape the electrode assembly and release a stress at corner, thereby inhibiting deformation of the electrochemical apparatus.

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 including a housing and a cell assembly disposed inside the housing, and the cell assembly includes a plurality of stacked cell units. The cell assembly further includes a fastening band, a first separator, and a fixing plate. The fastening band is disposed on an exterior surface of the cell assembly and is configured to limit an external expansion volume of the cell assembly. The first separator and the fixing plate are disposed on two opposite side surfaces of the cell assembly along a stacking direction of the cell units and are located on an exterior surface of the fastening band, and the first separator is sandwiched between the fastening band and the fixing plat.

Abstract: An electrochemical apparatus includes a housing, a circuit board, and a battery module, where the housing includes a cover and a bottom shell, and the cover and the bottom shell form an accommodating cavity; the circuit board is provided in the accommodating cavity, and the circuit board includes a first electrical connection portion; the battery module is accommodated in the accommodating cavity, and the battery module includes a second electrical connection portion; and a first fastening member is provided on an inner side of the bottom shell, and fastens the first electrical connection portion and the second electrical connection portion. With the electrochemical apparatus, short circuits caused by vibrations, extrusions, and frictions of internal structures of the unmanned aerial vehicle using such electrochemical apparatus can be reduced.

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 positive electrode material includes a substrate material, a one-dimensional conductive agent, and a fast ion conductor. The one-dimensional conductive agent exists on a surface of the substrate material, and the fast ion conductor exists on a surface of the one-dimensional conductive agent. The positive electrode material has improved electronic conductivity and ionic conductivity, thereby improving the performance of the electrochemical device containing the positive electrode material and of the electronic device.

Abstract: A battery module includes a cell assembly, where a cell in the cell assembly includes a cell body and a tab; and the battery module further includes: a first fastening band, configured to enclose the cell assembly in a thickness direction of the cell; and a second fastening band, configured to enclose the cell assembly in the thickness direction of the cell, where in a length direction of the cell, a distance between a projection location of the first fastening band and a first end of the cell body is less than or equal to L/4, a distance between a projection location of the second fastening band and a second end of the cell body is less than or equal to L/4, and L is length of the cell body.

Abstract: A battery device includes a case, a cell disposed within the case, and first and second conductive tabs each electrically connected to the cell and partly enclosed by the case. The first conductive tab has an elastic portion exposed from the case and compressible or stretchable when a force is applied thereto. By having the elastic portions that are elastically deformable, the effects of push or pull resulting from the swelling of the cell and case on the conductive tabs may be reduced. Consequently, damages or breakages of the conductive tabs can be avoided and the safety of battery device may be improved.

Abstract: The present application discloses a battery pack including a first battery and a second battery arranged in a stack, the second battery being closer to a center of the battery pack than the first battery in a stacking direction of the first battery and the second battery, wherein the first battery includes a first thermally conductive component and a first electrode assembly, the second battery includes a second thermally conductive component and a second electrode assembly, and a thermal conductivity of the second thermally conductive component is not lower than that of the first thermally conductive component. The battery pack provided by the present application may achieve temperature uniformity while keeping the overall temperature of the battery pack low.