Battery current measuring device and method

Patent metadata

Field	Value
Publication number	US-11835585-B2
Application number	US-202017420176-A
Country	US
Kind code	B2
Filing date	Jan 3, 2020
Priority date	Jan 4, 2019
Publication date	Dec 5, 2023
Grant date	Dec 5, 2023

Abstract

A battery current measuring device includes a switching element configured to control charging and discharging of a battery, an A/D converter configured to convert a voltage value across the switching element into a digital value, a temperature compensation unit having a diode structure capable of compensating for a resistance change according to a change of temperature of the switching element, and a current calculation unit configured to calculate a current flowing through the switching element based on the digital value of the voltage value, and the A/D converter converts the voltage value of the switching element into the digital value using a reference voltage inputted from the temperature compensation unit.

First claim

The invention claimed is:

1. A battery current measuring device comprising:
a switch configured to control charging and discharging of a battery:
an A/D converter configured to convert a voltage value across the switch into a digital value;
a temperature compensation unit having a diode structure capable of compensating for a resistance change according to a change of temperature of the switch; and
a controller configured to calculate a current flowing through the switch based on the digital value of the voltage value,
wherein the A/D converter is configured to convert the voltage value across the switch into the digital value using a reference voltage inputted from the temperature compensation unit;
wherein the switch is a MOSFET,
wherein the battery current measuring device is installed on a substrate, and wherein the temperature compensation unit and the MOSFET are formed on a same layer of the substrate.

2. The battery current measuring device of claim 1 , wherein the diode structure of the temperature compensation unit comprises a plurality of diodes, and
wherein a number of the plurality of diodes and a connection configuration of the plurality of diodes are adapted to have a temperature-resistance curve matching a temperature-resistance curve of the switch.

3. The battery current measuring device of claim 2 , further comprising a voltage amplification unit configured to amplify the voltage value, wherein the A/D converter is configured to convert the amplified voltage value across the switch into the digital value.

4. The battery current measuring device of claim 2 , wherein the reference voltage varies as a function of the diode structure and a temperature of the switch.

5. The battery current measuring device of claim 1 , wherein the temperature compensation unit is disposed sufficiently close to the switch such that the diode and the switch are subject to substantially the same temperature change.

6. A battery pack comprising:
a battery capable of being charged and discharged; and
the battery current measuring device of claim 1 .

7. The battery current measuring device of claim 1 , wherein the diode structure is adapted to have a temperature-resistance curve that matches a temperature-resistance curve of the switch.

8. A battery current measuring device comprising:
a switch configured to control charging and discharging of a battery:
an A/D converter configured to convert a voltage across the switch into a digital value;
a temperature compensation unit including a diode structure that is adapted to have a temperature-resistance curve matching a temperature-resistance curve the switch, wherein the diode structure of the temperature compensation unit is capable of compensating for a resistance change according to a temperature change of the switch;
a subtractor configured to:
receive the voltage across the switch and an output of the temperature compensation unit; and
output a constant voltage signal; and

a controller configured to calculate a current flowing through the switch based on the digital value of the voltage,
wherein the A/D converter is configured to convert the constant voltage signal output by the subtractor into the digital value using a fixed reference voltage.

Assignees

• Lg Energy Solution Ltd

Inventors

• Lee Won Tae
• Lee Chang Bok
• Hwang Sung Tack

Classifications

• H02J7/933

  the cycle being controlled or terminated in response to electric parameters · CPC title

• H02J7/80

  including monitoring or indicating arrangements · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• G01R31/3842 Primary

  combining voltage and current measurements · CPC title

• G01R31/374

  with means for correcting the measurement for temperature or ageing · CPC title