DRBP Balanced Discharge - LLM-Guided Battery Management

Step 1: Input Data Preparation

Battery State Summary

Extract battery state summary parameters from user prompt

Navigation Information (via Prompt)

Extract navigation parameters from user prompt

Step 2: Power Requirement Calculation

• See references/vehicle_model.md
• First calculate i_req,the discharge current of each cell must not exceed the continuous discharge current of 37.7A),then calculate v_req based on the current and power

Output: v_req (V) and i_req (A) (The discharge current of each cell must not exceed the continuous discharge current of 37.7A), based on:

• The discharge current of each cell must not exceed the continuous discharge current of 37.7A
• Constant power demand
• Vehicle efficiency model
• Battery pack constraints

Step 3: LLM Strategy Selection

Call LLM API with a structured prompt containing:

1. Battery state summary (module-level statistics)
2. Power requirement (Step 2)
3. Available strategy definitions (see references/strategies.md)

Expected LLM output format:

{
  "strategy": "", 
  "reason": "",   //reason for the choice
  "parameters": {
    "cells_per_module": 4,
    "priority_weights": {"soc": 0.9, "soh": 0.1}
  }
}

Available strategies:

1. High-energy: Maximize energy output, prioritize high-SOC cells
2. Equilibrium: Fast SOC convergence, prioritize highest-SOC cells
3. Thermal-management: Control temperature distribution, prioritize high-temperature cells
4. Lifetime-optimization: Minimize aging, prioritize low-SOH cells (with safety constraints)

Step 4: Cell Selection with Bucket Effect Protection

Execute scripts/cell_selector.py with LLM strategy parameters:

python scripts/cell_selector.py --battery input_file.json --strategy equilibrium --cells_per_module 4'

Bucket effect protection: The algorithm ensures the weakest selected cell (lowest SOC, highest resistance) can safely discharge for 10 minutes without dropping below minimum SOC threshold (default: 0.05). Critical Rule: When none of the options can be satisfied, directly return status as False and end the task.

Step 5: Topology Determination

In this step, there are no tools; the decision is directly handed over to the large model. Constraints:

• 20 modules in series → each module must have identical series/parallel configuration
• Selected cells per module must be divisible into equal series/parallel groups

Algorithm:

1. Calculate required series count: n_series = ceil(v_req / (20 * cell_nominal_voltage))
2. Calculate required parallel count: n_parallel = ceil(i_req / (cell_max_current * efficiency))
3. Find configuration where n_series × n_parallel ≤ selected_cells_per_module
4. If multiple configurations possible, choose minimal parallel count (fewer cells)

Step 6: Structured Output Generation

Once the final result is generated, you can finish; just return the result directly.Do not write it into the file. Final output format:

{
  "status": boolean, //Whether it meets the task requirements
  "v_req": float, //Required voltage, calculated based on current and power
  "i_req": float, //Required current, first match the current. The discharge current of each cell must not exceed the continuous discharge current of 37.7 A.
  "selected_cells": [
    {
      "mod_id": int,  //module id
      "cells": [[...], [...]]  // A two-dimensional list, where each sublist represents a parallel branch. For example, this is n in series and 2 in parallel
    },
    // ... 19 more modules
  ],
  "reason": ""  // reason for the choice
}

File References

• Strategy definitions: See references/strategies.md
• Vehicle model parameters: See references/vehicle_model.md
• Safety constraints: See references/safety_constraints.md

Important Notes

1. Ultimate goal: All cells must approach SOC=0 simultaneously at discharge completion
2. Bucket effect: Always verify weakest cell can meet 10-minute discharge requirement
3. Fallback reliability: Highest-SOC fallback must always produce valid configuration

Remember the primary objective: When battery pack discharge ends, every cell's SOC should be close to 0. All decisions must prioritize this balanced discharge goal.