CN-121995242-A - Battery monitoring system for battery, battery power system, and method for monitoring degradation of battery

Abstract

The application relates to a battery monitoring system for a battery, a battery power system and a method for monitoring degradation of a battery. A battery monitoring system for a battery includes a sensor array, a processor, and a memory. The sensor array measures battery parameters including ambient temperature and battery voltage, battery current, and battery temperature of the battery. The memory includes instructions. Execution of the instructions causes the processor to record the battery parameter from the sensor array during a charge mode and a discharge mode of the battery, respectively. The ambient temperature and the battery temperature are also used to determine an accumulated temperature history of the battery. The processor uses the battery voltage and current to calculate a total energy loss level for the battery, and then generates a degradation alert in response to the total energy loss level exceeding a loss threshold and the cumulative temperature history exceeding a temperature threshold.

Inventors

• A hero near the vine

Assignees

• 半导体元件工业有限责任公司

Dates

Publication Date

20260508

Application Date

20250513

Priority Date

20250307

Claims (20)

1. 1. A battery monitoring system for a battery, the battery monitoring system comprising: A sensor array configured to measure battery parameters including an ambient temperature and a battery voltage, a battery current, and a battery temperature of the battery; processor, and A memory comprising instructions executable by the processor to cause the processor to: recording the battery parameters from the sensor array during a charge mode and a discharge mode of the battery, respectively; determining an accumulated temperature history of the battery using the ambient temperature and the battery temperature; calculating a total energy loss level of the battery using the battery voltage and the battery current, and A degradation alert is generated in response to the total energy loss level of the battery exceeding a loss threshold and the cumulative temperature history exceeding a temperature threshold.
2. 2. The battery monitoring system of claim 1, wherein the instructions are executable by the processor to cause the processor to: Calculating an energy input rate of the battery during the charging mode using the battery parameters measured and recorded during the charging mode; Calculating an energy output rate of the battery during the discharge mode using the battery parameters measured and recorded during the discharge mode, and An energy loss rate is calculated as the total energy loss level of the battery using the energy output rate and the energy input rate.
3. 3. The battery monitoring system of claim 1, wherein the loss threshold is about 20% to about 30%.
4. 4. The battery monitoring system of claim 1, wherein the instructions are executable by the processor to cause the processor to: determining a current flow direction of the battery current using a current measurement block, and The current flow direction of the battery current is used to detect whether the operation mode of the battery is the charge mode or the discharge mode.
5. 5. The battery monitoring system of claim 1, wherein the instructions are executable by the processor to cause the processor to: Calculating a product of the battery current and the battery voltage as a power level of the battery; integrating the power level over time to determine a total energy value during the charge mode and during the discharge mode; Calculating an energy input rate of the battery using the total energy value during the charging mode, and The total energy value is used to calculate an energy output rate of the battery during the discharge mode.
6. 6. The battery monitoring system of claim 1, wherein the instructions are executable by the processor to cause the processor to: Calculating a numerical state of health SOH using the total energy loss level of the battery, and And sending an SOH notification to an external device, wherein the SOH notification indicates the numerical value SOH.
7. 7. A battery power system, the battery power system comprising: A battery connectable to a load; A sensor array configured to measure a set of battery parameters including an ambient temperature and a battery voltage, a battery current, and a battery temperature of the battery, and A battery monitoring system having a processor and a memory, The memory has instructions executable by the processor to cause the battery monitoring system to: Measuring and recording the battery parameters during a charge mode and a discharge mode of the battery, respectively; determining an accumulated temperature history of the battery using the ambient temperature and the battery temperature; calculating a total energy loss level of the battery using the battery voltage and the battery current, and A degradation alert is generated in response to the total energy loss level exceeding a loss threshold and the cumulative temperature history exceeding a temperature threshold.
8. 8. The battery power system of claim 7, wherein the battery monitoring system is configured to: Calculating an energy input rate of the battery during the charging mode using the battery parameters measured and recorded during the charging mode of the battery; Calculating an energy output rate of the battery during the discharge mode using the battery parameters measured and recorded during the discharge mode, and Energy loss is calculated as the total energy loss level of the battery using the energy output rate and the energy input rate.
9. 9. The battery power system of claim 8, wherein the battery monitoring system is configured to: calculating a product of the battery current and the battery voltage as a power level; integrating the power level over time to determine a total energy value during the charge mode and during the discharge mode; Calculating the energy output rate of the battery using the total energy value during the charging mode, and The energy output rate of the battery is calculated using the total energy value during the discharge mode.
10. 10. The battery power system of claim 7, wherein the loss threshold is about 20% to about 30%.
11. 11. The battery power system of claim 7, wherein the battery monitoring system is configured to: detecting whether an operation mode of the battery is the charge mode or the discharge mode of the battery by determining a current flow direction of the battery current using a current measurement block.
12. 12. The battery power system of claim 7, wherein the battery monitoring system is configured to: calculating a numerical state of health SOH of the battery using the total energy loss level, and An SOH notification is sent to an external device, the SOH notification indicating the numerical SOH of the battery.
13. 13. The battery power system of claim 7, wherein the battery is a lithium ion battery or a battery pack.
14. 14. A method for monitoring degradation of a battery, the method comprising: receiving, via a processor, battery parameters from a sensor array, the battery parameters including an ambient temperature and a battery voltage, a battery current, and a battery temperature of the battery; Recording the battery parameters during a charge mode and a discharge mode of the battery, respectively; Determining, via the processor, an accumulated temperature history of the battery using the ambient temperature and the battery temperature; calculating a total energy loss level of the battery using the battery voltage and the battery current, and In response to the total energy loss level exceeding a loss threshold and the accumulated temperature history exceeding a temperature threshold, a degradation alert is sent to an external device.
15. 15. The method of claim 14, the method further comprising: Calculating an energy input rate of the battery using the battery parameters measured and recorded during the charging mode; Calculating an energy output rate of the battery using the battery parameters measured and recorded during the discharge mode, and An energy loss rate is calculated as the total energy loss level of the battery using the energy output rate and the energy input rate.
16. 16. The method of claim 15, the method further comprising: The energy loss rate is calculated by subtracting the energy output rate from the energy input rate.
17. 17. The method of claim 14, the method further comprising: The energy loss rate is compared to the loss threshold, wherein the loss threshold is from about 20% to about 30%.
18. 18. The method of claim 14, the method further comprising: determining a current flow direction of the battery current using the processor, and Detecting whether an operation mode of the battery is the charge mode or the discharge mode of the battery based on the current flow direction of the battery current.
19. 19. The method of claim 14, the method further comprising: Calculating the product of said battery current and said battery voltage as a power level, and The power level is integrated over time to determine a total energy value during the charge mode and during the discharge mode.
20. 20. The method of claim 14, the method further comprising: calculating a numerical state of health SOH of the battery using the total energy loss level, and And transmitting an SOH notification to the external device, the SOH notification indicating the numerical SOH of the battery.

Description

Battery monitoring system for battery, battery power system, and method for monitoring degradation of battery Cross Reference to Related Applications The present application claims priority from U.S. provisional application No. 63/717,482, filed on 7 at 11 at 2024, which is hereby incorporated by reference in its entirety for all purposes. Technical Field The application relates to a battery monitoring system for a battery, a battery power system and a method for monitoring degradation of a battery. Background Electric vehicles, backup power sources, power stations, and other mobile and stationary battery power systems utilize rechargeable electrochemical cells as energy storage devices. In particular, the rechargeable and high energy storage capacities of lithium ion batteries have led to their widespread adoption in many different industries. For example, various types of lithium ion batteries are used to power electric motors in mobile and stationary battery power systems, as well as to energize actuators, sensors, displays and control circuits of many different medical devices, industrial systems and consumer products. While lithium ion batteries are an important component of modern battery power systems, their use presents a potential risk. For example, the internal temperature of an aged or malfunctioning battery cell may increase rapidly. Thermal management techniques such as coolant/air circulation, use of a radiator, and use of cell vents are therefore used to help regulate battery temperature. However, when the internal temperature of the battery cell increases beyond a threshold temperature point, the battery cell may begin to melt or burn. The pressure within the cell increases, which in turn can lead to cracking of the cell's housing or foil. When cell rupture occurs, the failed cell may discharge high temperature gases, molten materials, soot, and other emissions to the adjacent cell. This condition (i.e., thermal runaway) can adversely affect the operation of the battery and battery power system. Disclosure of Invention The present disclosure relates to circuit topologies and control methods for monitoring degradation and state of health (SOH) of electrochemical cells. In particular, the disclosed battery monitoring systems and methods for monitoring battery degradation are based on the total energy loss level (e.g., total energy loss rate) of the battery and the cumulative temperature history. The present teachings directed to detecting a degradation state of a battery without removing the battery from the battery power system seek to protect the battery power system and surrounding surfaces from thermal damage. More specifically, a potentially dangerous degradation state of the battery is detected before presenting a hazard. The present teachings enable active maintenance measures, including but not limited to issuing an alarm as an early warning of an impending battery failure. This in turn provides the operator with enough time to perform precautions such as battery replacement and/or circuit opening. In a possible embodiment, the processor of the Electronic Monitoring Unit (EMU) of the above battery monitoring system records the temperature of the battery over time as a temperature accumulation history. The processor also monitors the total energy input into the battery during the charge mode and the total energy output from the battery during the discharge mode. The difference between the charge energy value and the discharge energy value represents the total energy loss level within the battery, i.e., the total energy loss level of the battery may be calculated as an energy loss rate using the energy input rate and the energy output rate (e.g., by subtracting the energy output rate from the energy input rate). When the total energy loss level (which may be calculated as the total energy loss rate) exceeds the calibrated loss threshold, the processor determines whether the battery is in a potentially dangerous state, for example, by referencing the temperature accumulation history as an additional criterion. The above summary is not intended to represent each embodiment or aspect of the present disclosure. Rather, the foregoing summary illustrates certain novel aspects and features as set forth herein. The above and other features and advantages of the present disclosure will be apparent from the following detailed description of representative embodiments and modes for carrying out the present disclosure when taken in connection with the accompanying drawings and appended claims. Drawings The drawings described herein are for illustration purposes only and are schematic in nature and are intended to be illustrative rather than limiting the scope of the present disclosure. Fig. 1 illustrates a representative battery power system having a rechargeable battery and a battery monitoring system operable for monitoring a degradation level of the battery in accordance with the present disclosu