That can eventually cause it to do a thermal runaway, which means it can even start a fire.” “Now that the electrolyte is degraded, things are no longer insulated and so they start shorting, and that causes a hot spot later. “The reason why these batteries swell is because the electrolyte that separates the layers between the wrap degrades, and when that degrades, it changes into gas,” says Arthur Shi, lead technical writer at (Opens in a new window). Swollen battery (right) versus new power pack (Some laptops, usually business models, give you a choice of battery capacity/cell count at time of purchase, but that is less common than in the past.) The fact that laptops seldom come with removable batteries anymore (in the sense of, you can swap them in and out without opening up the chassis) exacerbates the problem. You'll often see laptop batteries described as, for example, four-cell or six-cell, indicating the internal structure of the battery. This happens as the materials inside a battery decay or are subjected to stress or physical damage over time.Ī given laptop battery is made up of several discrete cells, and issues can arise in just one, or more than one, of them.
The swelling is the result of too much current coursing, in a noncontrolled fashion, inside a cell of the battery, which causes a build-up of heat and gas. Swollen batteries are the result of two things: energy density and heat. We talked with some engineers and experts from computer manufacturers and related companies to dig into what you need to know about swollen batteries, and what to do if you have one. But why does this happen, and what can you do about it? That could be due to a big bubble that may have gradually, or suddenly, arisen in your battery. The screen of your phone starts bulging out, or its seams open up, or your laptop keyboard grows an unsightly bulge. You may well have had this happen to you: A laptop or phone you’ve had for years suddenly stops working, or maybe just starts showing some sign of internal physical swelling. And sometimes, that means they show the limits of the technology. And that has implications for batteries: They're in service for longer than ever, too. But lithium-ion batteries do have their limits, and given how powerful laptops have become in the last few years, we're relying on our machines for longer than ever. They’re robust enough to run our laptops for hours on a single charge, at the core of the latest smartphones, and even serve as the power plant behind cutting-edge electric vehicles like the Tesla family. Lithium-ion batteries pack an amazing punch for their size.
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