A battery pack including heterogeneous secondary batteries includes: a first battery set in which a plurality of first secondary batteries are stacked; and a second battery set in which a plurality of second secondary batteries are stacked, in which each of the first battery set and the second battery set is formed of a plurality, and the battery pack has an arrangement structure in which the plurality of first battery sets and the plurality of second battery sets are alternately stacked in one direction.

The present application relates to a battery module, which includes a first type of battery cells and a second type of battery cells electrically connected in series. The first type of battery cells and the second type of battery cells are battery cells with different chemical systems. The first type of battery cells includes N first battery cells, and the second type of battery cells includes M second battery cells, where N and M are greater than or equal one. The present application also relates to a battery pack and an electric apparatus including the battery module, and method and device for manufacturing the battery module.

The present application relates to a battery module, which includes a first type of battery cells and a second type of battery cells electrically connected in series. The first type of battery cells and the second type of battery cells are battery cells with different chemical systems. The first type of battery cells includes N first battery cells, and the second type of battery cells includes M second battery cells, where N and M are greater than or equal one. The present application also relates to a battery pack and an electric apparatus including the battery module, and method and device for manufacturing the battery module.

A walk-behind lawnmower including a deck including a shroud, a front end portion, and a plurality of ribs coupled to the front end portion and defining a contact plane, a first motor, a rechargeable battery, and a blade rotatably driven by the first motor about a rotational axis, the blade having a tip defining a blade circle about the rotational axis. A radially inner surface of the shroud is disposed a first distance from a nearest point of the blade circle, the first distance being between 0.12 inches and 0.38 inches, a radially outer surface of the shroud is disposed a second distance from a nearest point of the blade circle, the second distance being between 0.5 inches and 0.75 inches, and the contact plane is disposed a third distance from a nearest point of the blade circle, the third distance being between 1.75 inches and 2.75 inches.

A walk-behind lawnmower including a deck including a shroud, a front end portion, and a plurality of ribs coupled to the front end portion and defining a contact plane, a first motor, a rechargeable battery, and a blade rotatably driven by the first motor about a rotational axis, the blade having a tip defining a blade circle about the rotational axis. A radially inner surface of the shroud is disposed a first distance from a nearest point of the blade circle, the first distance being between 0.12 inches and 0.38 inches, a radially outer surface of the shroud is disposed a second distance from a nearest point of the blade circle, the second distance being between 0.5 inches and 0.75 inches, and the contact plane is disposed a third distance from a nearest point of the blade circle, the third distance being between 1.75 inches and 2.75 inches.

A power regulation unit is provided for regulating power to or from a power tool battery pack. The power regulation unit includes power regulation circuitry and a controller. The power regulation circuitry is configured to regulate a received power. The controller is connected to the power regulation circuitry. The controller is configured to receive input power from one or more battery cells, regulate the input power by performing at least one of a voltage regulation and a current regulation, and output a regulated output power. For voltage regulation, the regulated output power includes a constant voltage regardless of an operating current of the power tool. For current regulation, the regulated output power includes a constant voltage up to a predetermined current threshold.

A power regulation unit is provided for regulating power to or from a power tool battery pack. The power regulation unit includes power regulation circuitry and a controller. The power regulation circuitry is configured to regulate a received power. The controller is connected to the power regulation circuitry. The controller is configured to receive input power from one or more battery cells, regulate the input power by performing at least one of a voltage regulation and a current regulation, and output a regulated output power. For voltage regulation, the regulated output power includes a constant voltage regardless of an operating current of the power tool. For current regulation, the regulated output power includes a constant voltage up to a predetermined current threshold.

An apparatus for diagnosing an insulation condition between a battery pack and the ground includes a first resistor element electrically connected between a positive terminal of the battery pack and the ground, and a control circuit. The control circuit records a current flowing through the first test port as a first test current, while a high-level voltage is being applied between the positive terminal and the ground. The controller diagnoses the insulation condition between the battery pack and the ground, based on the first test current.

An energy storage system includes a pair of rack frames spaced apart from each other and arranged side by side; a plurality of L brackets fastened to the rack frames; a plurality of battery modules respectively placed on a pair of L brackets facing each other to form a plurality of layers along a longitudinal direction of the rack frame; a first heat transfer member interposed between the battery module and the L bracket; and a second heat transfer member interposed between the rack frame and the L bracket.

An energy storage container ventilation system and an energy storage container are provided according to the present disclosure. The ventilation system includes an air conditioner, an air duct, and multiple columns of battery racks, and each battery rack includes multiple lines of battery boxes, and an air outlet of the air conditioner is communicated with the air duct, a communicating part of each battery box and the air duct is provided with a ventilation plate with the same structure or different structures. The energy storage container ventilation system of the present disclosure uses an air conditioner to dissipate heat. Ventilation plates are provided at communicating parts of the air duct and each battery box. The structure of each ventilation plate is the same or different, so as to control an air intake volume flowing into each battery box.