Abstract: The car battery system of the present invention is provided with a battery block 2 that retains a plurality of battery cells 1 in a stacked configuration and has a terminal plane 2A, which is coincident with terminal surfaces 1A established by positive and negative battery cell 1 electrode terminals 13; and with a battery state detection circuit 30 that connects with the electrode terminals 13 of each battery cell 1. The battery system is provided with a circuit board 7 with surface-mounted electronic components 40 that implement the battery state detection circuit 30. The circuit board 7 is a single-sided board with electronic components 40 mounted on only one side, and the circuit board 7 is attached to the battery block 2 opposite the terminal plane 2A with the side having no electronic components 40 facing the battery block 2. The positive and negative electrode terminals 13 of each battery cell 1 are connected with the circuit board 7 for connection to the battery state detection circuit 30.

Abstract: A car battery system includes a plurality of battery cells, each battery cell having a positive electrode terminal and a negative electrode terminal, a battery block that retains the plurality of battery cells in a stacked configuration and has a terminal surface that is formed by battery cell terminal surfaces established by the positive and negative electrode terminals, and a battery state detection circuit that is connected to the electrode terminals of each battery cell to detect the condition of each battery cell. The positive and negative electrode terminals of each battery cell are connected to a circuit board and to the battery state detection circuit. The circuit board is connected to the positive and negative electrode terminals of each battery cell via voltage detection lines, and the voltage detection lines are connected to the same locations on the electrode terminals of each battery cell.

Abstract: A car battery system includes a battery block 2 that retains a plurality of battery cells 1 in a stacked configuration and has a terminal plane 2A, and a battery state detection circuit 30 that connects with the electrode terminals 13 of each battery cell 1. The battery system is provided with a circuit board 7 with surface-mounted electronic components 40 that implement the battery state detection circuit 30. The circuit board 7 is a single-sided board with electronic components 40 mounted on only one side, and the circuit board 7 is attached to the battery block 2 opposite the terminal plane 2A with the side having no electronic components 40 facing the battery block 2. The positive and negative electrode terminals 13 of each battery cell 1 are connected with the circuit board 7 for connection to the battery state detection circuit 30.

Abstract: The car battery system of the present invention is provided with a battery block 2 that retains a plurality of battery cells 1 in a stacked configuration and has a terminal plane 2A, which is coincident with terminal surfaces 1A established by positive and negative battery cell 1 electrode terminals 13; and with a battery state detection circuit 30 that connects with the electrode terminals 13 of each battery cell 1. The battery system is provided with a circuit board 7 with surface-mounted electronic components 40 that implement the battery state detection circuit 30. The circuit board 7 is a single-sided board with electronic components 40 mounted on only one side, and the circuit board 7 is attached to the battery block 2 opposite the terminal plane 2A with the side having no electronic components 40 facing the battery block 2. The positive and negative electrode terminals 13 of each battery cell 1 are connected with the circuit board 7 for connection to the battery state detection circuit 30.

Abstract: The car battery system of the present invention is provided with a battery block 2 that retains a plurality of battery cells 1 in a stacked configuration and has a terminal plane 2A, which is coincident with terminal surfaces 1A established by positive and negative battery cell 1 electrode terminals 13; and with a battery state detection circuit 30 that connects with the electrode terminals 13 of each battery cell 1. The battery system is provided with a circuit board 7 with surface-mounted electronic components 40 that implement the battery state detection circuit 30. The circuit board 7 is a single-sided board with electronic components 40 mounted on only one side, and the circuit board 7 is attached to the battery block 2 opposite the terminal plane 2A with the side having no electronic components 40 facing the battery block 2. The positive and negative electrode terminals 13 of each battery cell 1 are connected with the circuit board 7 for connection to the battery state detection circuit 30.

Abstract: The voltage detection circuit 3 is provided with an isolation transformer 4 having its primary side connected to battery 2 connection nodes 10, a switching device 5 connected to the primary side of the isolation transformer 4, an isolated input circuit 7 that switches the switching device 5 ON and OFF, and a secondary voltage detection section 8 that detects output voltage from the secondary side of the isolation transformer 4. In the voltage detection circuit 3, the series input circuit 6 of the isolation transformer 4 primary side and the switching device 5 are connected to battery 2 measurement nodes, the switching device 5 is switched ON and OFF with a given periodicity by the isolated input circuit 7, and the output voltage from the secondary side of the isolation transformer 4 is detected by the secondary voltage detection section 8 to determine the voltage across the measurement nodes.

Abstract: The car battery system of the present invention is provided with a battery block 2 that retains a plurality of battery cells 1 in a stacked configuration and has a terminal plane 2A, which is coincident with terminal surfaces 1A established by positive and negative battery cell 1 electrode terminals 13; and with a battery state detection circuit 30 that connects with the electrode terminals 13 of each battery cell 1. The battery system is provided with a circuit board 7 with surface-mounted electronic components 40 that implement the battery state detection circuit 30. The circuit board 7 is a single-sided board with electronic components 40 mounted on only one side, and the circuit board 7 is attached to the battery block 2 opposite the terminal plane 2A with the side having no electronic components 40 facing the battery block 2. The positive and negative electrode terminals 13 of each battery cell 1 are connected with the circuit board 7 for connection to the battery state detection circuit 30.

Abstract: The car battery system of the present invention is provided with battery blocks 2 that retain a plurality of battery cells 1 in a stacked configuration and have terminal planes 2A, which are coincident with terminal surfaces 1A established by positive and negative battery cell 1 electrode terminals 13; and with battery state detection circuits 30 that connect with the electrode terminals 13 of each battery cell 1 to detect the condition of each battery cell 1. The car battery system implements a battery state detection circuit 30 on a circuit board 7, 87, and the circuit board 7, 87 is mounted on a battery block 2 in a position opposite the terminal plane 2A of the battery block 2. Further, the positive and negative electrode terminals 13 of each battery cell 1 are connected with a circuit board 7, 87 for connection to a battery state detection circuit 30.

Abstract: A leakage detection circuit for an electric vehicle includes a battery pack, first and second leakage detection switches, a controller, a leakage detection resistor, a voltage detector, and a calculator. The first and second leakage detection switches are connected to the high and low voltage sides of the battery pack, respectively. The battery pack includes a plurality of batteries that are connected in series. The midpoint of the leakage detection resistor is connected to the ground via the first and second leakage detection switches. The controller alternately turns the first and second leakage detection switches ON. Thus, the voltage detector detects leakage voltage values that are generated in the leakage detection resistor. The controller turns the first and second leakage detection switches ON and OFF, respectively, to detect a first leakage voltage value of the leakage voltage values.

Abstract: The voltage detection circuit 3 is provided with an isolation transformer 4 having its primary side connected to battery 2 connection nodes 10, a switching device 5 connected to the primary side of the isolation transformer 4, an isolated input circuit 7 that switches the switching device 5 ON and OFF, and a secondary voltage detection section 8 that detects output voltage from the secondary side of the isolation transformer 4. In the voltage detection circuit 3, the series input circuit 6 of the isolation transformer 4 primary side and the switching device 5 are connected to battery 2 measurement nodes, the switching device 5 is switched ON and OFF with a given periodicity by the isolated input circuit 7, and the output voltage from the secondary side of the isolation transformer 4 is detected by the secondary voltage detection section 8 to determine the voltage across the measurement nodes.

Abstract: A leakage detection circuit for an electric vehicle includes a battery pack, first and second leakage detection switches, a controller, a leakage detection resistor, a voltage detector, and a calculator. The first and second leakage detection switches are connected to the high and low voltage sides of the battery pack, respectively. The battery pack includes a plurality of batteries that are connected in series. The midpoint of the leakage detection resistor is connected to the ground via the first and second leakage detection switches. The controller alternately turns the first and second leakage detection switches ON. Thus, the voltage detector detects leakage voltage values that are generated in the leakage detection resistor. The controller turns the first and second leakage detection switches ON and OFF, respectively, to detect a first leakage voltage value of the leakage voltage values.