Device and system for determining a Dynamic Health Index (DHI) for traction batteries of electric and hybrid vehicles

Abstract

Device for determining a dynamic battery health index (DHI), characterized in that it includes a recording unit for capturing time and speed values, includes an input unit for manually entering or selecting the state of charge (SoC), an evaluation unit that determines a first or second performance difference from acceleration and deceleration measurements between different SoC ranges, a combination unit that calculates a normalized overall index (DHI) from both performance differences, and a display unit that outputs the determined index value.

Description

Technical field.

[0001] The invention relates to the field of vehicle dynamics battery analysis, in particular of high-voltage traction batteries (drive batteries) in electric and hybrid vehicles. It describes a device that uses driving data (time, speed and state of charge) to record the performance behavior of a vehicle battery and derives a characteristic value for its dynamic health. State of the art.

[0002] Current battery tests are mostly based on stationary discharge procedures or BMS-internal estimates of the state of health (SoH). While these provide capacity values, they do not capture actual performance under varying load conditions. A simple, driving-dynamic measuring device for assessing battery health during real-world driving, which does not require electrical measurements or BMS integration, is not yet known.

[0003] The object of the invention is to provide a device that records the power output and absorption capacity of a vehicle battery under real driving conditions and uses this data to generate a standardized Dynamic Health Index (DHI). The solution should be achievable without interfering with the BMS and without electrical measurements.

[0004] Solution to the problem: The problem is solved by a device with the following technical units. 1. Recording unit, designed to record time and speed values ​​from vehicle-specific sensors, GPS or external receivers. 2. State of charge (SoC) input unit that allows the user to manually enter or select the current battery state of charge. Alternatively, the device can optionally be equipped with a data interface (e.g., OBD or BMS) for automatic data acquisition. 3. Evaluation unit, set up to determine a first power difference from acceleration measurements at different SoC ranges, and a second power difference from deceleration measurements (recuperation) at the same SoC ranges. 4. Combination unit that combines both differences into a normalized overall value, the Dynamic Health Index (DHI). 5. Display unit that visually outputs the determined index value and its subcomponents. Technical effects and advantages.

[0005] The device enables the assessment of battery health solely based on driving data, without electrical current or voltage measurements. By comparing acceleration and deceleration processes at different state-of-charge (SoC) levels, the battery's performance under real-world load is recorded. The resulting index allows for an objective and reproducible evaluation of the battery's state of charge, independent of weather, tires, or vehicle load. The system operates non-invasively, requires no laboratory conditions, and can be used across a range of vehicles. Example of implementation.

[0006] In a preferred embodiment, the device consists of a smartphone or microcontroller with a GPS receiver, a user interface for inputting the state of charge (SoC) before each measurement run, and a processing unit that analyzes acceleration and deceleration data, calculates the time differences, and uses this information to determine the Daily Hazard Index (DHI). Optionally, the device can be expanded with an OBD or CAN interface to automatically detect the state of charge. In an alternative embodiment, the device can include mechanical or manually operated components, such as a stopwatch for timekeeping and a speedometer. Data analysis can be performed via an app, spreadsheet, or processing unit.

[0007] Furthermore, the device enables the direct comparison of batteries from different vehicles, model years, or software versions by using a standardized indicator (Dynamic Health Index, DHI). The DHI can be stored in a central or decentralized database for statistical analysis to display average values, trends, or deviations from the typical condition of similar vehicles.

[0008] This allows for an objective assessment of battery health compared to reference groups, without the system being tied to a specific online platform or network architecture.

Claims

[1] Device for determining a dynamic battery health index (DHI), characterized by that they includes a recording unit for capturing time and speed values, includes an input unit for manually entering or selecting the state of charge (SoC), an evaluation unit that determines a first or second performance difference from acceleration and deceleration measurements between different SoC ranges, a combination unit that calculates a normalized overall index (DHI) from both performance differences, and a display unit that outputs the determined index value. [2] Device according to claim 1, characterized by that the detection unit is operated via GPS or vehicle-internal speed sensors. [3] Device according to any one of the preceding claims, characterized by, that it also includes a data interface (e.g. OBD, BMS, CAN) for the optional automatic recording of the state of charge and other vehicle-internal real-time data, which can be used to refine the calculation or weighting of the Dynamic Health Index (DHI). [4] Device according to any one of the preceding claims, characterized by that it is equipped for the automatic or manual performance of acceleration and deceleration measurements. [5] Device according to any one of the preceding claims, characterized by that the display unit visualizes the history or trend analysis of the Dynamic Health Index (DHI).