Battery pack

Patent metadata

Field	Value
Publication number	US-2019334356-A1
Application number	US-201716349944-A
Country	US
Kind code	A1
Filing date	Oct 19, 2017
Priority date	Dec 21, 2016
Publication date	Oct 31, 2019
Grant date	—

Abstract

A battery pack may include: a plurality of cell stacks; a plurality of monitoring circuits configured to detect voltages of a plurality of cells included in a corresponding cell stack among the cell stacks; a plurality of current measurement circuits configured to measure current consumption of a corresponding monitoring circuit among the monitoring circuits; a plurality of current adjustment circuits configured to adjust a discharge current of a corresponding cell stack among the cell stacks; and a battery controller configured to receive a current consumption measurement result of the monitoring circuits from the current measurement circuits, to calculate current consumption deviation between the monitoring circuits based on the current consumption measurement result of the monitoring circuits, and to control the current adjustment circuits based on the current consumption deviation.

First claim

1 . A battery pack comprising:
a plurality of cell stacks; a plurality of monitoring circuits configured to detect voltages of a plurality of cells included in a corresponding cell stack among the cell stacks; a plurality of current measurement circuits configured to measure current consumption of a corresponding monitoring circuit among the monitoring circuits; a plurality of current adjustment circuits configured to adjust a discharge current of a corresponding cell stack among the cell stacks; and a battery controller configured to receive a current consumption measurement result of the monitoring circuits from the current measurement circuits, to calculate current consumption deviation between the monitoring circuits based on the current consumption measurement result of the monitoring circuits, and to control the current adjustment circuits based on the current consumption deviation.

2 . The battery pack of claim 1 , further comprising
a plurality of current detection resistors respectively connected between the cell stacks and the monitoring circuits, wherein each of the measurement circuits measures a current flowing through a corresponding current detection resistor among the current detection resistors and outputs the measured current as a measured value of the current consumption.

3 . The battery pack of claim 2 , wherein
each of the monitoring circuits includes a voltage detection integrated circuit, and each of the current detection resistors is connected between a corresponding one of the cell stacks and a power terminal of the voltage detection integrated circuit.

4 . The battery pack of claim 3 , wherein
the current measurement circuits are disposed within the voltage detection integrated circuit of a corresponding monitoring circuit among the monitoring circuits.

5 . The battery pack of claim 3 , wherein
the current adjustment circuits are disposed within the voltage detection integrated circuit of a corresponding monitoring circuit among the monitoring circuits.

6 . The battery pack of claim 2 , further comprising
a plurality of short-circuit switches respectively connected between the cell stacks and the monitoring circuits, wherein each of the short-circuit switches is connected in parallel with a corresponding one of the current detection resistors.

7 . The battery pack of claim 6 , wherein
the battery controller controls the short-circuit switches to be turned off during a period for measuring current consumption by using the current measurement circuits

8 . The battery pack of claim 7 , wherein
the battery controller controls the short-circuit switches to be turned on during a period for detecting cell voltages by using the monitoring circuits.

9 . The battery pack of claim 2 , wherein
each of current detection resistors is connected between a negative terminal of a lowest potential cell among a plurality of cells included in a corresponding cell stack of the cell stacks and a ground terminal of a corresponding monitoring circuit of the monitoring circuits.

10 . The battery pack of claim 1 , wherein
each of the current adjustment circuits includes: a plurality of resistors connected between opposite ends of a corresponding cell stack of the cell stacks; and a plurality of switches connected to corresponding resistors of the resistors to block or conduct current flows of the corresponding resistors.

11 . The battery pack of claim 10 , wherein
the battery controller adjusts a discharge current of a corresponding cell stack of the cell stacks by adjusting a number of switches that are turned on among the switches.

12 . The battery pack of claim 1 , wherein
each of the current adjustment circuits includes: a plurality of balancing resistors connected between a corresponding cell stack of the cell stacks and a corresponding monitoring circuit of the monitoring circuits; and a plurality of switches connected to corresponding balancing resistors of the balancing resistors to block or conduct current flows of the corresponding balancing resistors.

13 . The battery pack of claim 12 , wherein
the battery controller receives a cell voltage detection result for each of the cell stacks through the monitoring circuits, and controls cell balancing of each of the cell stacks by controlling the switches based on the cell voltage detection results.

14 . The battery pack of claim 12 , wherein
the battery controller turns on the switches included in a corresponding current adjustment circuit among the current adjustment circuits for a monitoring circuit having relatively small current consumption among the monitoring circuits.

15 . The battery pack of claim 14 , wherein
the battery controller controls a turn-on duty of the switches included in each of the current adjustment circuits to adjust a current consumption amount of the current adjustment circuits.

16 . A battery pack comprising:
a cell stack configured to include a plurality of cells; a voltage detection integrated circuit electrically connected to the cells to detect cell voltages of the cells; a current measurement resistor connected between one of opposite ends of the cell stack and a power terminal of the voltage detection integrated circuit; a short-circuit switch connected in parallel with the current measuring resistor; a current measurement circuit configured to measure a current flowing in the current measurement resistor; a current adjustment circuit connected between opposite ends of the cell stack to adjust a discharge current of the cell stack; and a battery controller configured to control turn-on of the short-circuit switch, to receive a current measurement result from the current measurement circuit in a state where the short-circuit switch is turned off, and to control the current adjustment circuit based on the current measurement result.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Hidaka Takao

Classifications

• H02J7/56

  Active balancing, e.g. using capacitor-based, inductor-based or DC-DC converters · CPC title

• B60L58/21

  having the same nominal voltage · CPC title

• B60L2240/547

  Voltage · CPC title

• B60L3/12 Primary

  Recording operating variables {; Monitoring of operating variables} · CPC title

• B60L50/64

  Constructional details of batteries specially adapted for electric vehicles · CPC title