Systems and methods for improving cell balancing and cell failure detection

Patent metadata

Field	Value
Publication number	US-2018337431-A1
Application number	US-201815984264-A
Country	US
Kind code	A1
Filing date	May 18, 2018
Priority date	May 22, 2017
Publication date	Nov 22, 2018
Grant date	—

Abstract

One innovative aspect of the subject matter described herein comprises an energy storage module that comprises one or more energy storage cells, one or more sensor circuits, a network interface, and a first safety circuit. The sensor circuits detect a condition of the energy storage module indicative of a malfunction. The first safety circuit monitors the sensor circuits for detection of the condition indicative of a malfunction. The first safety circuit receives a pulsed signal. When the one or more sensor circuits detect the condition indicative of a malfunction, the first safety circuit interrupts the pulsed signal being conveyed. When the one or more sensor circuits does not detect the condition indicative of a malfunction, the first safety circuit conveys the pulsed signal. A unique network identifier of the network interface is determined based on an arbitration method using said network interface in conjunction with the first safety circuit.

First claim

What is claimed is:

1 . An energy storage module comprising:
one or more energy storage cells; one or more sensor circuits configured to detect a condition of the energy storage module indicative of a malfunction of the energy storage module; a network interface; and a first safety circuit configured to: monitor the one or more sensor circuits for detection of the condition indicative of a malfunction of the energy storage module, receive a pulsed signal, and when the one or more sensor circuits detect the condition indicative of a malfunction of the energy storage module, interrupt the pulsed signal being conveyed from the first safety circuit, and when the one or more sensor circuits does not detect the condition indicative of a malfunction of the energy storage module, convey the pulsed signal from the first safety circuit, wherein a unique network identifier of the network interface is determined based on an arbitration method using said network interface in conjunction with the first safety circuit.

2 . The energy storage module of claim 1 , wherein the first safety circuit is electrically coupled to a second safety circuit of an upstream or a downstream energy storage module.

3 . The energy storage module of claim 2 , wherein the first and second safety circuits are coupled via a wired connection.

4 . The energy storage module of claim 1 , further comprising a pulse generator configured to generate the pulse signal for conveyance through the first safety circuit, wherein the first safety circuit comprises an input coupled to the pulse generator and an output coupled to a second safety circuit of a downstream energy storage module.

5 . The energy storage module of claim 1 , wherein the first safety circuit comprises an input coupled to a second safety circuit of an upstream energy storage module and an output coupled to a third safety circuit of a downstream energy storage module.

6 . The energy storage module of claim 1 , wherein in order to interrupt the pulsed signal, the first safety circuit is configured to one or more of: truncate the pulse signal or adjust one of a pulse width, an amplitude, a frequency, or a periodicity of the pulse signal.

7 . The energy storage module of claim 6 , wherein the truncated or adjusted pulse signal indicates the malfunction of the energy storage module.

8 . The energy storage module of claim 1 , wherein the arbitration method uses a communication through the first safety circuit to identify that the network interface is to be assigned the unique identifier.

9 . A method of monitoring an energy storage module, the method comprising:
detecting a condition of an energy storage module indicative of a malfunction of the energy storage module; receiving a pulsed signal; determining an unique network identifier of a network interface based an arbitration method using said network interface in conjunction with a safety circuit; when the condition indicative of a malfunction of the energy storage module is detected, interrupting the pulsed signal being conveyed from a first safety circuit; and when the condition indicative of a malfunction of the energy storage module is not detected, conveying the pulsed signal from the first safety circuit.

10 . The method of claim 9 , wherein the first safety circuit is electrically coupled to a second safety circuit of an upstream or a downstream energy storage module.

11 . The method of claim 10 , wherein the first and second safety circuits are coupled via a wired connection.

12 . The method of claim 9 , further comprising generating, via a pulse generator, the pulse signal for conveyance through the first safety circuit, wherein the first safety circuit comprises an input coupled to the pulse generator and an output coupled to a second safety circuit of a downstream energy storage module.

13 . The method of claim 9 , wherein the first safety circuit comprises an input coupled to a second safety circuit of an upstream energy storage module and an output coupled to a third safety circuit of a downstream energy storage module.

14 . The method of claim 9 , wherein interrupting the pulsed signal comprises one or more of: truncating the pulse signal or adjusting one of a pulse width, an amplitude, a frequency, or a periodicity of the pulse signal.

15 . The method of claim 14 , wherein the truncated or adjusted pulse signal indicates the malfunction of the energy storage module.

16 . The method of claim 9 , wherein the arbitration method uses a communication through the first safety circuit to identify that the network interface is to be assigned the unique identifier.

17 . An energy storage module, comprising:
means for detecting a condition indicative of a malfunction of the energy storage module; means for monitoring the means for detecting for detection of the condition indicative of a malfunction of the energy storage module; means for receiving and conveying a pulsed signal; means for determining an unique network identifier of a network interface based an arbitration method using said network interface in conjunction with the means for receiving and conveying; and means for interrupting the pulsed signal being conveyed from the means for receiving and conveying when the condition indicative of a malfunction of the energy storage module is detected, wherein the means for receiving and conveying a pulsed signal conveys the pulsed signal when the condition indicative of a malfunction of the energy storage module is not detected.

18 . The module of claim 17 , further comprising means for generating the pulse signal for conveyance through the first safety circuit, wherein the first safety circuit comprises an input coupled to the means for generating the pulse signal and an output coupled to a second safety circuit of a downstream energy storage module.

19 . The module of claim 17 , wherein the means for interrupting the pulsed signal is configured to one or more of: truncate the pulse signal or adjust one of a pulse width, an amplitude, a frequency, or a periodicity of the pulse signal.

20 . The module of claim 17 , wherein the arbitration method uses a communication through the first safety circuit to identify that the network interface is to be assigned the unique identifier.

Assignees

• Maxwell Lab

Inventors

• James Christopher

Classifications

• H02J7/65

  against overtemperature · CPC title

• H02J7/64

  against overvoltage · CPC title

• H02J7/80

  including monitoring or indicating arrangements · CPC title

• H02J7/60

  including safety or protection arrangements · CPC title

• H02J7/52

  for charge balancing, e.g. equalisation of charge between batteries · CPC title