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ReJoule Fast Battery Diagnostics by Zora Chung
Rejoule Energy, based in Southern California, focuses on repurposing electric vehicle (EV) batteries through a fast and accurate battery grading tool utilizing electrochemical impedance spectroscopy. They have successfully secured over $4.8 million in grants for their innovative technology, which can assess battery health in less than five minutes, significantly faster than traditional methods. The company is looking to scale their testing capabilities and collaborate with OEM partners for future developments.
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ReJoule Fast Battery Diagnostics by Zora Chung
- 1. Fast Battery Diagnostics 1 Based inSouthern California www.rejouleenergy.com
- 2. 2 Contents ● ReJoule Overview ●Obstacles with Repurposing Electric Vehicle Batteries ● Our Solution and Case Studies ● Other Challenges ● What’s Next on Our Roadmap ● How to Work With Us
- 3. 3 $225K SBIR -Phase I $1M SBIR - Phase II $3.0M Project partners: Project to repurpose used EV batteries $150K Concept award: Product prototype $160K voucher External validation of products $450K Prototype award: Scale from module to pack National Science Foundation California Energy Commission CalSEED & CalTestBed Raised >$4.8M in Grants since inception in 2017 $3M is to repurpose used EV batteries in a second-life application
- 4. Problem: How toManage 3.4M Packs in 2025 4 Shipping & recycling each pack can cost thousands of dollars
- 5. Battery Cycling: Expensiveand Time Consuming 5 Cell cycler: up to 5V Module cycler: up to 60V Pack cycler: up to 750V
- 6. Solution: A Fast+ Accurate Battery Grading Tool See virtual demo for more. Software & Algorithms Connected to battery terminals Hardware ReJoule’s proprietary solution leverages electrochemical impedance spectroscopy
- 7. 7 ReJoule has TestedDifferent Battery Types Chemistries: NMC, NCA, and LFP Form Factors: Cylindrical and Prismatic First life application: Tesla Model 3 and Electric Forklift Chemistries: LMO, NMC and LFP Form Factors: Pouch, Cylindrical, and Prismatic First life application: Nissan LEAF, Electric Truck and Electric Bus Module Configuration: 2S1P, 4S99P, 8S1P Cells Modules
- 8. 8 Test time Accuracy Benchmark (cycling)6 hours n/a ReJoule 5 minutes (60x faster) + /- 2% ReJoule 30 seconds (720x faster) + /- 3.5% Case Study 1: 500 Used Electric Truck Modules Graded Module Specs: Voltage: 12.8 V Energy: 1.76 kWh Configuration: 4S 99 P Chemistry: LFP
- 9. 9 Case Study 2:115 New and Used Forklift Cells Graded Cell Specs: Voltage: 3.2 V Energy: 320 Wh Chemistry: LFP Results: 5 min test <2% benchmark; 1 sec test 2% benchmark
- 10. Cycling Time Speed Accuracy 3.2V LFP Prismatic Cells ~240min 5 min 48x +/- 2% 12.8V LFP Cylindrical Modules ~360 min 5 min 72x +/- 2% 26V LFP Modules ~540 min 5 min 108x +/-2% 3 Case Studies: At Least 50X Faster and Within +/-2% Error 10 ReJoule was able to get within 3% accuracy with only 50 samples
- 11. Other Challenges: DocumentedIn Our Blog ? Blog 1 Disassembly: no standard design, damage is possible Blog 3 Lack of critical info: battery specs, historical usage Blog 4 Cell imbalance: no battery degrades in the same way Blog 5 Battery placement: permitting, fire codes, site needs
- 12. 12 Next on theRoadmap: Scale up to Test Packs In-Vehicle Seeking OEM partners now as we develop our first prototype! Plug device into vehicle charging port 1 Perform pack-level measurement in <5 min 2 Get health prediction within 2% accuracy 3 Ah: kWh: SOH: B 157 55.7 83% Battery Health Report
- 13. 13 How to WorkWith Us GAAS ● Grading-as-a- service ● Subscription for grading algorithms ● 1 subscription per site per piece of hardware Consultation ● Problem and Application ● Vehicle and Battery Specs ● Timing and Budget Proof of Concept ● Performance Metrics ● Deliver short term benefits ● Set foundation for long-term value creation info@rejouleenergy.com
- 14. 14 Other Ways toLearn More ● Follow us on LinkedIn, Twitter, Facebook and Instagram ● Request our technical presentations (under What We Do -> Our technology on our website)
- 15. www.rejouleenergy.com Zora Chung, Cofounderand CFO zora@rejouleenergy.com Maximizing the Value of EV Batteries 15 Key Takeaways: • State-of-health (SOH) is critical to enable the circular economy for EV batteries • ReJoule’s test can provide SOH in minutes • We’re scaling up to test packs and seeking partners now!