How does an EV battery work?
Electric vehicle (EV) batteries are intricate energy storage systems that fuel the vehicle’s electric motor. They consist of battery cells organised into modules, managed by a sophisticated battery management system (BMS) to ensure efficient operation.
Battery cells, available in various shapes like cylindrical, prismatic, or pouch-shaped, serve as the primary storage units for electrical energy. They store and release energy as needed through chemical reactions, powering the vehicle’s electric motor.
The battery management system (BMS) plays a crucial role in overseeing the battery pack’s performance, regulating temperature, voltage, and state of charge. This management ensures optimal operation, preventing issues like overcharging or overheating and facilitating cell balancing for uniform performance.
What is the process to repair an EV battery?
When addressing an electric vehicle (EV) battery issue, repairs often involve diagnosing and resolving specific issues within the battery modules. These issues can arise from various factors such as cell degradation or environmental conditions like temperature variations. In this particular instance, the repair focused on replacing a module that had developed issues affecting its performance and reliability.
Supervised by a staff member from JLR NZ, Alex, our skilled technician at Archibalds, led the repair process with care and expertise. Here’s a closer look at how the repair was carried out:
- Preparation: Before beginning the repair, Alex ensured the battery pack was safely powered off and removed any protective covers or enclosures to access the internal components.
- Isolation: Through comprehensive testing and analysis, Alex identified the specific module requiring replacement and isolated it from the rest of the battery pack. This involved disconnecting inter-module connections to ensure only the targeted module was affected.
- Module Replacement: With careful attention, Alex removed the damaged module from the pack and replaced it with a new one, following manufacturer guidelines for proper installation.
- Reassembly: Once the new module was installed, Alex reassembled the battery pack, reconnecting inter-module connections and replacing protective covers or enclosures. Every component was secured to prevent potential issues.
- Testing: The repaired battery pack underwent thorough testing to verify its functionality and safety. Alex conducted diagnostic tests to ensure proper voltage levels, cell balancing, and overall performance before returning it to service.


















