US 2022/0018907 A1Published application

Processing System for Monitoring the Cell Voltages of a Rechargeable Battery, Related Battery Monitoring System and Electric Vehicle

AssigneeStmicroelectronics Application GmbH

InventorMarkus Ekler

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Abstract

An embodiment processing system comprises terminals configured to be connected to cells of a rechargeable battery to receive cell voltages, a digital processing circuit, a serial communication interface and a transmission queue interfacing the digital processing circuit with the serial communication interface for parallel operation. The digital processing circuit synchronously acquires a given number of digital samples of each of the cell voltages and stores them to a memory. The digital processing circuit encodes the digital samples stored to the memory via a data compression module, and stores the encoded data to the transmission queue. For example, the data compression module may generate the encoded data by subtracting a given offset from each digital sample to generate values indicative of the dynamic variation of each sample with respect to the offset, and removing a given number of most significant bits from each value.

Claims23

Dependent claims

A processing system configured to monitor a given number of cell voltages of a given number of cells of a rechargeable battery, wherein the processing system comprises:

terminals configured to be connected to the cells in order to receive the given number of cell voltages;
at least one analog to digital converter configured to generate digital samples of the given number of cell voltages, each digital sample having a given number of bits;
a transmission queue;
a digital processing circuit comprising a data compression module, wherein the digital processing circuit is configured to perform the following steps for a plurality of times:
synchronously acquire a given number of the digital samples of each of the given number of cell voltages;
store the acquired digital samples in a memory;
receive a given offset via a serial communication interface;
encode, by the data compression module using a dynamic range reduction operation, the given number of digital samples of the given number of cell voltages stored in the memory, thereby generating encoded data, the dynamic range reduction operation comprising:
subtracting the given offset from each of the given number of digital samples of the given number of cell voltages, thereby generating values indicative of a dynamic variation of each sample with respect to the offset, and
removing a given number of most significant bits from each of the values indicative of the dynamic variation of each sample with respect to the offset;
and
store the encoded data in the transmission queue;
and
the serial communication interface, configured to sequentially transmit the encoded data stored in the transmission queue, while the digital processing circuit acquires new digital samples.

11 more elements

A battery monitoring system comprising:

two terminals configured to be connected to a rechargeable battery;
a plurality of processing systems, each of the processing systems configured to monitor a given number of cell voltages of a given number of cells of the rechargeable battery, wherein each of the processing systems comprises:
further terminals configured to be connected to the cells in order to receive the given number of cell voltages;
at least one analog to digital converter configured to generate digital samples of the given number of cell voltages, each digital sample having a given number of bits;
a transmission queue;
a digital processing circuit comprising a data compression module, wherein the digital processing circuit is configured to perform the following steps for a plurality of times:
synchronously acquire a given number of the digital samples of each of the given number of cell voltages;
store the acquired digital samples in a memory;
receive a given offset via a serial communication interface;
encode, by the data compression module using a dynamic range reduction operation, the given number of digital samples of the given number of cell voltages stored in the memory, thereby generating encoded data, the dynamic range reduction operation comprising:
subtracting the given offset from each of the given number of digital samples of the given number of cell voltages, thereby generating values indicative of a dynamic variation of each sample with respect to the offset, and
removing a given number of most significant bits from each of the values indicative of the dynamic variation of each sample with respect to the offset;
and
store the encoded data in the transmission queue;
and
the serial communication interface, configured to sequentially transmit the encoded data stored in the transmission queue, while the digital processing circuit acquires new digital samples;
and
a further processing system configured to receive the encoded data from the plurality of processing systems.

15 more elements

An electric vehicle comprising:

a rechargeable battery;
and
a battery monitoring system comprising:
two terminals connected to the rechargeable battery;
a plurality of processing systems, each of the processing systems configured to monitor a given number of cell voltages of a given number of cells of the rechargeable battery, wherein each of the processing systems comprises:
further terminals configured to be connected to the cells in order to receive the given number of cell voltages;
at least one analog to digital converter configured to generate digital samples of the given number of cell voltages, each digital sample having a given number of bits;
a transmission queue;
a digital processing circuit comprising a data compression module, wherein the digital processing circuit is configured to perform the following steps for a plurality of times:
synchronously acquire a given number of the digital samples of each of the given number of cell voltages;
store the acquired digital samples in a memory;
receive a given offset via a serial communication interface;
encode, by the data compression module using a dynamic range reduction operation, the given number of digital samples of the given number of cell voltages stored in the memory, thereby generating encoded data, the dynamic range reduction operation comprising:
subtracting the given offset from each of the given number of digital samples of the given number of cell voltages, thereby generating values indicative of a dynamic variation of each sample with respect to the offset, and removing a given number of most significant bits from each of the values indicative of the dynamic variation of each sample with respect to the offset;
and
store the encoded data in the transmission queue;
and
the serial communication interface, configured to sequentially transmit the encoded data stored in the transmission queue, while the digital processing circuit acquires new digital samples;
and
a further processing system configured to receive the encoded data from the plurality of processing systems.

17 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/368,198Filed 6 Jul 2021
Priority: IT 10202000001758120 Jul 2020
Published: 20 Jan 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification26 codes

G01R 31/382
Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of…
H02J 7/40
Circuit arrangements for charging or discharging batteries or for supplying loads from batteries: characterised by the exchange of charge or…
B60L 3/12
Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy…:…
B60L 58/12
For monitoring or controlling batteries: responding to state of charge [SoC]