XIAMEN AMPACK TECHNOLOGY LIMITED

A power conversion system, including: a first terminal and a second terminal of a first resonant converter on a first side are electrically connected to a first terminal and a second terminal of a battery pack respectively, and a first terminal of the first resonant converter on a second side is electrically connected to a DC bus at a first node; a second resonant converter, where a first terminal and a second terminal of the second resonant converter on a first side are electrically connected to the first terminal and the second terminal of the battery pack respectively, and a second terminal of the second resonant converter on a second side is electrically connected to the bus at a second node. A second terminal of the first resonant converter, and a first terminal of the second resonant converter, and the DC bus are electrically connected to a third node.

A battery pack includes a shell, a cell assembly, and a plurality of thermally conductive pieces. The shell is provided with a top wall and a bottom wall disposed opposite to each other along a first direction. The cell assembly is disposed inside the shell. The cell assembly includes a plurality of battery cells arranged along the first direction. Each thermally conductive piece includes a thermally conductive portion and a connecting portion connected to the thermally conductive portion. Each thermally conductive portion is located between different adjacent battery cells. The thermally conductive portion is connected to at least one of the adjacent battery cells. The connecting portion is connected to the top wall or the bottom wall.

A housing assembly includes a housing and a fan disposed on the housing; The housing includes a front wall and a rear wall disposed opposite to each other along a first direction, a first sidewall and a second sidewall disposed opposite to each other along a second direction, and a top wall and a bottom wall disposed opposite to each other along a third direction, The top wall includes a first opening, and the first sidewall includes a second opening. The housing includes a first accommodation space and an air duct. The air duct communicates with an external space of the housing, the first opening, and the second opening. The fan is configured to drive an airflow into the air duct through one of the first opening or the second opening, and out of the air duct through the other of the first opening or the second opening.

A battery module includes a cell assembly, a first component, a first insulation member, and a second component. The cell assembly includes a plurality of cells, and each cell includes a cell housing and an electrode terminal, the electrode terminal extends out from the cell housing. The cell assembly and the first component are arranged along a first direction, the first component has a first recess, and a portion of each electrode terminal is disposed in the first recess. At least a portion of the first insulation member is disposed in a gap between the electrode terminal and the first component. The second component is provided with a first through hole. The first recess includes a first opening facing the second component, and along the first direction, a projection of the first through hole overlaps with a projection of the first opening.

A battery pack includes a housing, a battery module, an insulator, and a thermally conductive adhesive. The insulator is provided with a first space, at least a portion of the battery module is accommodated in the first space, and both the insulator and the battery module are disposed in the housing. The thermally conductive adhesive is disposed in the first space, the thermally conductive adhesive is configured to be formed by curing a flowable thermally conductive material injected into the first space, and the thermally conductive adhesive is connected to the insulator and the battery module.

A cell balancing device and method includes: obtaining a first minimum cell voltage value and a first maximum cell voltage value of a to-be-balanced battery module in a latest full-charging operation; determining a first charge capacity of a first target cell in the battery module in a corresponding first time period in response to a first charging operation by the battery module; and updating a balancing capacity of the first target cell based on the first charge capacity. The first target cell has a voltage value greater than or equal to the first minimum cell voltage value. The first time period corresponding to the first target cell is a period of time that begins when the voltage value of the first target cell reaches the first minimum cell voltage value for a first time and that ends when the first charging operation of the battery module is ended.