T3B 18650 netlist explicit optimization

Tier-3B explicit-netlist battery benchmark that reuses the open-ended transition-program search with native explicit-circuit or hybrid-thermal scoring.

See Optimization Problem Catalog for the optimization family index.

Quick Facts

Field	Value
Problem ID	battery_18650_t3b_netlist_explicit_opt
Problem Family	optimization
Implementation	design_research_problems.problems.optimization._battery_open_ended:Battery18650T3BNetlistExplicitOptimizationProblem
Capabilities	baseline-solver, bounded-variables, statement-markdown
Study Suitability	none
Tags	optimization, battery, tiered, tier-3b, explicit-netlist, graph-netlist

Taxonomy

Formulation

mixed_discrete_optimization

Convexity

nonconvex

Design Variable Type

mixed

Is Dynamic

no

Orientation

engineering_practical

Feasibility Ratio Hint

0.02

Objective Mode

single

Constraint Nature

hard

Bounds Summary

fixed-length transition program over the open-ended explicit battery grammar

Tags

optimization, battery, tiered, tier-3b, explicit-netlist, graph-netlist

Benchmark Contract

Benchmark Question

How well do methods handle explicit battery-netlist synthesis when wiring is a first-class design decision?

Physically Modeled

Explicit cells, terminals, and interconnects; Shared explicit-circuit validation and discharge simulation; Grid-based layout summary and a steady-state thermal proxy

Deliberate Surrogates

The solver is a deterministic transition-program baseline rather than a strong optimizer; Thermal behavior remains a low-order proxy layered on top of the explicit circuit backend

Representation Mode

explicit_netlist

Default Evaluation Mode

explicit_circuit

Supported Evaluation Modes

explicit_circuit, hybrid_thermal

Validation Scope

Explicit-circuit consistency checks

Solver Role

deterministic baseline search

Statement

Tier 3B exposes the explicit battery netlist as the native design representation. The candidate vector is a transition program over the open-ended battery grammar; each decoded design contains explicit cells, terminals, interconnects, and pack terminals.

Unlike the topology-allocation surrogate rung, this benchmark does not assume a typed stage schema as its primary representation. The explicit-circuit backend is the evaluator by contract.

The bundled solver remains a deterministic baseline over the transition-program space. Its role is to provide a reproducible reference behavior rather than a state-of-the-art combinatorial optimizer.

Problem Shape

Field	Value
Design Variable Count	32
Bound Summary	fixed-length transition program over the open-ended explicit battery grammar
Total Constraint Count	5
Equality Constraint Count	0
Inequality Constraint Count	5

Variable Bounds

Variable	Lower Bound	Upper Bound
x[0]	0	8192
x[1]	0	8192
x[2]	0	8192
x[3]	0	8192
x[4]	0	8192
x[5]	0	8192
x[6]	0	8192
x[7]	0	8192
x[8]	0	8192
x[9]	0	8192
x[10]	0	8192
x[11]	0	8192
x[12]	0	8192
x[13]	0	8192
x[14]	0	8192
x[15]	0	8192
x[16]	0	8192
x[17]	0	8192
x[18]	0	8192
x[19]	0	8192
x[20]	0	8192
x[21]	0	8192
x[22]	0	8192
x[23]	0	8192
x[24]	0	8192
x[25]	0	8192
x[26]	0	8192
x[27]	0	8192
x[28]	0	8192
x[29]	0	8192
x[30]	0	8192
x[31]	0	8192

Manifest Parameters

Key	Value
ambient_temperature_c	25
evaluation_mode	explicit_circuit
load_current_a	60
max_cell_count	24
max_depth_mm	500
max_height_mm	250
max_width_mm	500
maximum_temperature_c	60
minimum_capacity_ah	10
minimum_current_a	60
objective_weights	{“cost”: 0.3, “temperature”: 0.3, “volume”: 0.4}
target_voltage_v	14.8
voltage_tolerance_v	0.1

Library Interface

• generate_initial_solution(seed=None)

• objective(x)

• evaluate(x)

• solve(initial_solution=None, seed=None, maxiter=200)