Method and system for determining the state of health of a battery of a land motor vehicle

Abstract

The invention relates to a method for determining the value of a parameter characterizing the state of health of a battery composed of a plurality of cells and mounted on a land motor vehicle, and to an associated computer determination system (100).

Description

Technical Field

[0001] The present invention relates to the field of systems for maintaining batteries installed on land motor vehicles. In particular, the invention relates to a method for determining the value of a parameter characterizing the state of health of a battery composed of a plurality of cells and installed on a land motor vehicle. The invention also relates to a system implementing such a method. The invention is particularly applicable to motor vehicles. Background Art

[0002] Today, the maintenance of electric vehicles is mainly based on the inspection of the electric drive train. To do this, the vehicle must be immobilized for an average period of 48 hours in order to fully discharge the battery and then fully recharge it. Therefore, the process of verifying the correct operation of the battery of an electric vehicle remains very limited for the user, since it involves the vehicle being out of service for relatively long periods of time. This is regrettable, since these restrictions may dissuade potential future electric vehicle buyers, thereby limiting the popularity of electric vehicles in the global automotive population, which are known to be the least polluting. Summary of the invention

[0003] The present invention aims to provide a method and a system that overcome these drawbacks. The present invention aims in particular to provide a method and a system that help make it possible to check the correct functioning of a battery installed on a land motor vehicle without requiring the vehicle to be immobilized. More specifically, the object of the present invention is to provide a method and a system that enable the state of health of a battery installed on a land motor vehicle to be determined remotely.

[0004] According to the invention, these objects are achieved by a method for determining the value of a parameter characterizing the state of health of a battery composed of a plurality of cells and mounted on a land motor vehicle, the method comprising the following steps:

[0005] - receiving processed data generated by a computer of the vehicle and transmitted by radio frequency signal communication means arranged in the vehicle, the processed data comprising data representative of the state of charge of the battery, data representative of at least one voltage measurement for each of the cells, data representative of at least one current intensity measurement for each of the cells, data representative of at least one temperature measurement for each of the cells and data representative of a trip performed by the vehicle,

[0006] - determining for each of the cells a value of a parameter characterizing the state of health of the cell by using data characterizing at least one voltage measurement for each of the cells, data characterizing at least one current intensity measurement for each of the cells and data characterizing at least one temperature measurement for each of the cells,

[0007] - determining at least one value of a parameter characterizing the use of the battery by using data characterizing the state of charge of the battery and data characterizing the trips performed by the vehicle, and

[0008] - determining the value of the parameter characterizing the state of health of the battery by using the value of the parameter characterizing the state of health of each of the cells and the value characterizing the use of the battery.

[0009] According to a variant, the data representative of a trip performed by the vehicle may comprise data representative of at least one consumption value resulting from the trip.

[0010] According to another variant, the data representative of a trip performed by the vehicle may comprise data representative of at least one charge value stored in a deceleration phase and / or in braking occurring during the trip.

[0011] According to another variant, the data representative of the journeys performed by the vehicle may be generated by using vehicle geolocation means.

[0012] The subject of the invention is also a computer system for determining the value of a parameter characterizing the state of health of a battery composed of a plurality of cells and mounted on a land motor vehicle, said system comprising means for implementing the method defined above.

[0013] According to a variant, the system may comprise at least one processor and a data storage medium in which is stored at least one program for executing the steps according to the method implemented by the system.

[0014] Another subject of the invention is a computer program comprising program code instructions for executing the steps of the method defined above.

[0015] Another subject of the invention is a medium usable in a computer, on which is recorded the program defined above. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Other features and advantages of the present invention will become more apparent upon reading the following detailed description and the accompanying drawings, in which:

[0017] Figure 1 is a block diagram of a system according to the present invention, and

[0018] Figure 2 is a flow chart illustrating some steps of the method according to the invention. DETAILED DESCRIPTION

[0019] Figure 1A computer system 100 for determining the value of a parameter characterizing the state of health of a battery consisting of a plurality of units and mounted on a land motor vehicle according to the invention is shown. The computer determination system 100 comprises an information processing unit 101 comprising one or more processors, a data storage medium 102 and at least one input and output interface 103. Furthermore, the computer determination system 100 comprises an interface 104 with a private or public communication network (e.g. the Internet) in order to send and receive data. According to some embodiments of the invention, the computer determination system 100 comprises one or more computers, one or more servers, one or more supercomputers and / or any combination comprising one of these computer systems.

[0020] According to the invention, all the elements described above contribute to allowing the system 100 to implement a method of determining the value of a parameter characterizing the state of health of a battery composed of a plurality of cells and mounted on a land motor vehicle as described below.

[0021] like Figure 2 As shown, according to step 201, the computer determination system 100 receives processed data generated by the computer of the vehicle and transmitted by a radio frequency signal communication device arranged in the vehicle. Advantageously, these processed data include data representing the state of charge of the battery, data representing at least one voltage measurement for each of the cells, data representing at least one current measurement for each of the cells, data representing at least one temperature measurement for each of the cells, and data representing the trip performed by the vehicle. Preferably, the data representing the state of charge of the battery, the data representing at least one voltage measurement for each of the cells, the data representing at least one current measurement for each of the cells, and the data representing at least one temperature measurement for each of the cells are generated by the computer of the vehicle based on electrical signals sent by sensors arranged in the vehicle and capable of measuring voltage, current and temperature for each of the battery cells of the vehicle. In addition, the data representing the trip performed by the vehicle are generated by the computer by interacting with a geolocation device arranged in the vehicle, the geolocation device comprising a receiver interacting with a satellite positioning system. Advantageously, in addition to data representing geographical coordinates related to the trip, the data representing the trip performed by the vehicle include data representing at least one consumption value generated by the trip. Alternatively or additionally, the data representative of a journey performed by the vehicle comprise data representative of at least one charge value stored in a deceleration phase and / or in a braking phase occurring during said journey.

[0022] Then, according to another step 202, the computer determination system 100 determines, for each of said cells, a value of a parameter characterizing the state of health of the cell, by using at least the information processing unit 101 and the data storage medium 102. To this end, the computer determination system 100 uses data characterizing at least one voltage measurement for each of said cells, data characterizing at least one current measurement for each of said cells and data characterizing at least one temperature measurement for each of said cells.

[0023] Then, according to another step 203, the computer determination system 100 determines at least one value of a parameter characterizing the use of the battery during a trip performed by the vehicle, using at least the information processing unit 101 and the data storage medium 102. To this end, the computer determination system 100 uses data characterizing the state of charge of the battery and data characterizing the trip performed by the vehicle, in particular data characterizing at least one consumption value resulting from the trip and data characterizing at least one charge value stored in deceleration phases and / or braking occurring during the trip.

[0024] Finally, according to the final step 204, by using at least the information processing unit 101 and the data storage medium 102, the computer determination system 100 determines the value of the parameter characterizing the health state of the battery by using the value of the parameter characterizing the health state of each of the units and the value characterizing the use of the battery.

[0025] Thus, according to the various aspects of the method and system of the invention described above, functional components are provided to make it possible to check the correct operation of a battery installed on a land motor vehicle without requiring the vehicle to be immobilized. Furthermore, by the specific selection of the processing parameters explained above, the method and system according to the invention are able to more accurately determine the state of health of a battery installed on a land motor vehicle.

[0026] The invention is not limited to the embodiments described above which are shown merely by way of example, but extends to other embodiments, in particular those which are formed within the capabilities of a person skilled in the art by combining some features described using some embodiments with other features described using other embodiments.

Claims

1. A method for determining, by means of a computer system (100), the value of a parameter characterizing the state of health of a battery composed of a plurality of cells and mounted on a land motor vehicle, It is characterized in that The method comprises the following steps: - receiving processed data generated by a computer of the vehicle and transmitted by radio frequency signal communication means arranged in the vehicle, the processed data comprising data representative of the state of charge of the battery, data representative of at least one voltage measurement for each of the cells, data representative of at least one current intensity measurement for each of the cells, data representative of at least one temperature measurement for each of the cells and data representative of a trip performed by the vehicle, the data representative of a journey performed by the vehicle include data representative of at least one consumption value resulting from the journey, and / or the data representative of a journey performed by said vehicle include data representative of at least one charge value stored in a deceleration phase and / or in a braking phase occurring during said journey, - determining for each of the cells a value of a parameter characterizing the state of health of the cell by using data characterizing at least one voltage measurement for each of the cells, data characterizing at least one current intensity measurement for each of the cells and data characterizing at least one temperature measurement for each of the cells, - determining at least one value of a parameter characterizing the use of the battery by using data characterizing the state of charge of the battery and data characterizing the trips performed by the vehicle, and - determining the value of the parameter characterizing the state of health of the battery by using the value of the parameter characterizing the state of health of each of the cells and the value characterizing the use of the battery.

2. The method according to claim 1, It is characterized in that Data representative of a journey performed by the vehicle is generated using a vehicle geo-positioning device.

3. A computer system (100) for determining the value of a parameter characterizing the state of health of a battery consisting of a plurality of cells and mounted on a land motor vehicle, It is characterized in that The system comprises components for implementing the method according to any of the preceding claims.

4. The system according to claim 3, It is characterized in that The system comprises at least one processor (101) and a data storage medium (102) in which at least one program is stored for executing the steps according to the method implemented by the system.

5. A computer program product, the computer program comprising program code instructions for executing the steps of the method according to any one of claims 1 or 2 when the program is executed on a computer.

6. A medium usable in a computer, on which the computer program product according to claim 5 is recorded.

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