The battery rack consists of the required number of modules, the Battery Management Unit (BMU), a breaker and other components. . The anode inside a lithium ion battery does some pretty important stuff during charging and discharging cycles, mostly made from stuff like graphite or silicon these days. From the outside, a battery is a monolithic block of energy. But to truly understand what you're buying and what separates a. . This article delves into the intricate construction of a lithium-ion battery pack, examining the crucial components that make it an indispensable power source.