A first voltage detection device includes a plurality of first voltage detection portions connected to a plurality of lead portions of a plurality of battery cells, a first holding body holding the plurality of first voltage detection portions, and an insulator provided at the first holding body, at least a portion of the insulator being located between the different lead portions.

A first voltage detection device includes a plurality of first voltage detection portions connected to a plurality of lead portions of a plurality of battery cells, a first holding body holding the plurality of first voltage detection portions, and an insulator provided at the first holding body, at least a portion of the insulator being located between the different lead portions.

A power connector is provided that is configured to conduct a current. The power connector includes a base structure, an extension structure, and a connector head structure that define a current path for the current. The base structure is coupled to an output node of a primary conductor and receives the current from the primary conductor. The connector head structure is configured to output the current from the power connector to the load. The extension structure is coupled to and extends between the base structure and the connector head structure. The extension structure includes a current constriction region configured to increase a magnetic flux density of a magnetic field produced by the current flowing through the current constriction region at a position of a magnetic current sensor that generates a sensor signal based on the magnetic field magnetic field produced by the current flowing through the current constriction region.

An increase in the load of the booster circuit may be suppressed, and the voltage measurement accuracy may be improved. A battery monitoring IC of a battery monitoring system includes a first buffer amplifier and a second buffer amplifier driven by a power supply voltage or a boost voltage and having an input terminal connected to one terminal of any one of battery cells of an assembled battery. The control part selects the battery cell to be connected to the input terminals of the first and second buffer amplifiers. The control part switches a voltage for driving the first and second buffer amplifiers to the boost voltage when an upper battery cell is selected, and switches the voltage for driving the first and second buffer amplifiers to the power supply voltage when a battery cell other than the upper battery cell is selected.

An increase in the load of the booster circuit may be suppressed, and the voltage measurement accuracy may be improved. A battery monitoring IC of a battery monitoring system includes a first buffer amplifier and a second buffer amplifier driven by a power supply voltage or a boost voltage and having an input terminal connected to one terminal of any one of battery cells of an assembled battery. The control part selects the battery cell to be connected to the input terminals of the first and second buffer amplifiers. The control part switches a voltage for driving the first and second buffer amplifiers to the boost voltage when an upper battery cell is selected, and switches the voltage for driving the first and second buffer amplifiers to the power supply voltage when a battery cell other than the upper battery cell is selected.

A battery tester includes a pair of battery clamps, a testing unit, and a pair of holsters. Each battery clamp is configured to connect to a terminal of a battery. The testing unit includes testing circuitry that is connected to the battery clamps, and is configured to perform one or more battery tests on a battery connected to the battery clamps. Each of the holsters is attached to a housing of the testing unit, and is configured to receive and hold one of the battery clamps.

A battery tester includes a pair of battery clamps, a testing unit, and a pair of holsters. Each battery clamp is configured to connect to a terminal of a battery. The testing unit includes testing circuitry that is connected to the battery clamps, and is configured to perform one or more battery tests on a battery connected to the battery clamps. Each of the holsters is attached to a housing of the testing unit, and is configured to receive and hold one of the battery clamps.

A voltage detection unit includes a voltage detection terminal, a housing including a terminal accommodating concave and a cover to he attached to the housing and to cover the voltage detection terminal accommodated in the terminal accommodating concave. The cover includes an extension piece extending in a first direction. The housing includes an accommodating hole to accommodate the extension piece, and a guide portion including an inclined surface and a guide surface. The inclined surface has a first end in the first direction and a second end and is inclined with respect to the first direction such that the first end is provided closer to the accommodating hole than the second end in a second direction perpendicular to the first direction and being parallel to the housing. The guide surface is continuous with the inclined surface and an inner wall surface of the accommodating hole.

A voltage detection unit includes a voltage detection terminal including a first portion configured to be conductively connected to a detection target and a second portion, a housing having a plate shape and including a terminal accommodating concave configured to accommodate the voltage detection terminal, a cover configured to be engaged with the housing at a temporary locking position at which the cover does not cover the first portion of the voltage detection terminal accommodated in the terminal accommodating concave and at a final locking position at which the cover covers the first portion and an electric wire conductively connected to the voltage detection terminal at the second portion and configured to, when the voltage detection terminal is accommodated in the terminal accommodating concave, be drawn out from the housing.

An apparatus for detecting a voltage of a high-voltage battery, may include a voltage sensing portion configured to detect a voltage of the high-voltage battery; a transmission wire connected to the voltage sensing portion to transmit the voltage of the battery, detected by the voltage sensing portion, to the outside of the apparatus; a cover of covering a position in which the voltage sensing portion is connected to the transmission wire; and a foam pad, which is disposed inside the cover, is formed of a material, a volume of which increases when heat is transferred thereto, and when heat is generated, expands to prevent the heat from being transferred to the voltage sensing portion or the battery or to release a connection between the transmission wire and the voltage sensing portion.