SLAAEF5B March   2024  – June 2025 MSPM0G1505 , MSPM0G1506 , MSPM0G1507 , MSPM0G3506 , MSPM0G3507 , MSPM0H3216 , MSPM0L1303 , MSPM0L1304 , MSPM0L1304-Q1 , MSPM0L1305 , MSPM0L1305-Q1 , MSPM0L1306 , MSPM0L1306-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Algorithm Introduction
    1. 2.1 Battery Basic Knowledge Introduction
    2. 2.2 Different SOCs and Used Technologies
      1. 2.2.1 NomAbsSoc Calculation
        1. 2.2.1.1 Coulometer With OCV Calibration
        2. 2.2.1.2 Data Fusion
        3. 2.2.1.3 Battery Model Filter
      2. 2.2.2 CusRltSoc Calculation
        1. 2.2.2.1 EmptySoc and FullSoc
        2. 2.2.2.2 Core Temperature Evaluation
      3. 2.2.3 SmoothRltSoc Calculation
    3. 2.3 Algorithm Overview
      1. 2.3.1 Voltage Gauge Introduction
      2. 2.3.2 Current Gauge Introduction
      3. 2.3.3 Capacity Learn Introduction
      4. 2.3.4 Mixing Introduction
  6. 3Gauge GUI Introduction
    1. 3.1 MCU COM Tool
    2. 3.2 SM COM Tool
    3. 3.3 Data Analysis Tool
  7. 4MSPM0 Gauge Evaluation Steps
    1. 4.1 Step 1: Hardware Preparation
    2. 4.2 Step 2: Get a Battery Model
      1. 4.2.1 Battery Test Pattern
      2. 4.2.2 Battery Model Generation
    3. 4.3 Step 3: Input Customized Configuration
    4. 4.4 Step 4: Evaluation
      1. 4.4.1 Detection Data Input Mode
      2. 4.4.2 Communication Data Input Mode
    5. 4.5 Step 5: Gauge Performance Check
      1. 4.5.1 Learning Cycles
      2. 4.5.2 SOC and SOH Accuracy Evaluation
  8. 5MSPM0 Gauge Solutions
    1. 5.1 MSPM0L1306 and 1 LiCO2 Battery
      1. 5.1.1 Hardware Setup Introduction
      2. 5.1.2 Software and Evaluation Introduction
      3. 5.1.3 Battery Test Cases
        1. 5.1.3.1 Performance Test
        2. 5.1.3.2 Current Consumption Test
    2. 5.2 MSPM0G3507, BQ76952 and 4 LiFePO4 Batteries
      1. 5.2.1 Hardware Setup Introduction
      2. 5.2.2 Software and Evaluation Introduction
      3. 5.2.3 Battery Test Cases
        1. 5.2.3.1 Performance Test 1 (Pulse Discharge)
        2. 5.2.3.2 Performance Test 2 (Load Change)
    3. 5.3 MSPM0L1306 and BQ76905
  9. 6Summary
  10. 7References
  11. 8Revision History

5.2.3.2 Performance Test 2 (Load Change)

Here is the test based on a 3800mAh LiFePO4 battery, under 25°C. The u16MaxFullChgVoltThd setting is 3800mV. The EmptyDhgVoltThd setting is 2300mV.

Note: Make sure the battery is settled before the MCU is powered and the battery is in rest state before testing, otherwise, the first SOC output is met with an error.

Here is the test pattern: do constant discharge 2 times and then change the load. The Figure 5-17 shows the condition of a battery cell in the battery pack. Due to sourcemeter power limitation, only simple tests are run.

Battery Test Case Figure 5-17 Battery Test Case

See the test result in Figure 5-17. At beginning, there is a obvious gap for NomSOC, CusSOC and SmoothSOC. This is caused from the first OCV calibration error.

Due to residual learn algorithm, see that the SmoothSOC can perform between 0% and 100% when the voltage is reaching the end of discharge voltage (2300mV). Remember at the same time, the EmptySOC needs learning cycles, which means if users do not input iq15AbsEmptySocMatrixInput, then the SmoothSOC error is large when the battery reaches the end of the first discharge voltage.

For different NomFullCap, the FltNomFullCap is updated after almost every rest. With the digital filter help, the NomFullCap gets more and more accurate. After the MaxNomFullCap changes from 0 to a value, this means the output NomFullCap is with an acceptable accuracy.

Battery Test Result Figure 5-18 Battery Test Result

Figure 5-19 the result for battery pack.

Battery Test Result Figure 5-19 Battery Test Result