Batteries

Performance and Endurance Tests:

Acc. to batteries supplier specifications

Acc. to the user’s requirements, mission profiles Benchmarking

Process and test validation (including audits)

Temperature dependence

 

 

 

 

Problem Solving

 

Post Mortem and Construction Analyses, Reverse Engineering

Cell/Battery pack disassembly Cell opening and analyses of components: Microscopy and materials characterization (TEM, SEM, EDX, XRD, FTIR, GC-MS, XPS, …) Electrochemical Characterization Cell cross-sectioning and analyses Serma Technologies can provide services and expertise for any type of battery chemistries Alkaline (MnO2, Silver…) Lead Acid Lithium Ion and Lithium Metal Polymer Lithium primary batteries Nickel Cadnium, Nickel Metal Hydide Supports of Lead Acid Batteries Manufacturers Process control upgrading SPC deployment Process audit Training session Construction analysis

 

 

 

Batteries Management System (BMS)

Development of control algorithms (soft)
Benchmark of electronic components (hardware)
Qualification
Thermal Management,
Safety,
SOC Indicators,
Balancing
Problem Solving and Corrective Actions

 

Batteries Tests Capabilities & Equipments

Test equipment for electrical characterization:
---- Ranging from small size button/coin cells
-----to fully integrated battery pack for the automotive industry (250 kW) 
---- Frequency Response Analyzer (FRA) for cell impedance evaluation

Climate chambers (-20 - + 60 °C) and ovens, thermal baths
Glove box under dry air and inert atmosphere for construction analyses

Case 1 : X1-Y1 batteries in non conformity when received by the customer

Electrical :

- Charge/ Discharge tests and capacitance measurement
- Charge C10 during 16h and discharge 5C during 5h (stop at 1V)
- Stabilisation
- Capacitance measurement
- Test duration: 10 days
- Cycles during 8 days at different charge/discharge conditions (C/40 to C/2)
- Optional : Impedence spectroscopy : internal R measurement, from a few mHz to 65KHz.

Physical : Battery Opening and sample extraction

- Visual and optical Inspections
- Sample preparation for access to the active material (electrolyte removal, drying in oven)
- Embedding and polishing
- SEM/EDX observation
- Optional : X-Ray Diffraction for grain size of negative material

Case 2 : X2-Y2 Batteries , not in correspondance with the expected performances (field return).

Phase 1 - Engineering
- Use condition study : determination of a representative functional user profile (for further ageing tests)

Phase 2 - Performance Tests
- Charge and Discharge cycles at 3 oven temperatures (25°C, 0°C, -10°C)
- Different discharge conditions (1C, 0.5C, 0.2C)

Phase 3 - Endurance Tests
- Tests following performance tests according to the profile as defined phase1

Phase 4 -  BMS characterization
- Battery opening
- For each cell : Voltage measurement
Capacitance measurement according to 0.5C discharge

Case 3 : X3-Y3 Batteries, Comparative tests

 

Phase 1 - Performance Tests - Initial capacitance measurement - Five cycles at C/10 down to 70% of discharge depth - Residual discharge Phase 2 - Yield Tests - Five cycles between 0 and 50% SOC, then between 0 and 100% SOC Phase 3 - Stratification - Five cycles up to 14.1V, then five cycles up to Capacitance=1.2C10 Phase 4 -  Ageing tests, according to CEI 61427 - Temperature ramp up from 25°C to 40°C - Cycling according to Steps A and B

 

Equipment list for batteries

 

Further informations !
CALL US : +33 (0)557 26 08 88
Business : Sylvain DULPHY, Sales Engineer (+33 (0)677 10 37 40
Technical : Pascal GOUEREC, Energy Technical Leader

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