5 ms·

I would imagine that increasing the spacing between the cells actually fixed the problem, while the case and vent are just limiting the PR and financial liabili

by cmsmith 13y ago

I would imagine that increasing the spacing between the cells actually fixed the problem, while the case and vent are just limiting the PR and financial liability.

pootch 13y ago
From an electrical engineering standpoint, that makes no sense. Thermal runaway starts when too much power is being drawn from the batteries and they begin to overheat until exploding or melting, their promixity to each other may limit the damage of an overloaded or malfunctioning cell, however the core problem remains, why are 787 electronic systems overloading the batteries? If one cell explodes or melts, you still essentially have a fire in progress. Protecting the other cells buys you time, but how much time do you have when there is fire on a plane? Obviously its a design issue, probably very complex that Boeing simply doesnt have the time and money to investigate thoroughly. So this is a patch. Nothing I have read indicates an engineering approach was taken to prevent the previous result.
hkmurakami 13y ago
pooch, your post is appearing as [dead] to me so your account may be hellbanned, which you may want to get fixed since you've made an informative post that many users won't be able to see.
- azth 13y ago
  Can you copy/paste it?
  - uvdiv 13y ago
    "From an electrical engineering standpoint, that makes no sense. Thermal runaway starts when too much power is being drawn from the batteries and they begin to overheat until exploding or melting, their promixity to each other may limit the damage of an overloaded or malfunctioning cell, however the core problem remains, why are 787 electronic systems overloading the batteries?" "If one cell explodes or melts, you still essentially have a fire in progress. Protecting the other cells buys you time, but how much time do you have when there is fire on a plane?" "Obviously its a design issue, probably very complex that Boeing simply doesnt have the time and money to investigate thoroughly." "So this is a patch. Nothing I have read indicates an engineering approach was taken to prevent the previous result." https://news.ycombinator.com/item?id=5740563 https://news.ycombinator.com/item?id=5740563
- deleted 13y ago
  [deleted]
neurotech1 13y ago
The spacing between the cells minimizes the chance of a multi-cell cascading fire. I think they also changed the charging controller to better monitor the battery status and charge/discharge current. Changing the controller was part of the "fix". I'm guessing at some point, they'll make a change to the Lithium cell chemistry for enhanced safety. Changing the chemistry of the battery, and controller software updates is the real fix. The rest is just failure mitigation.

by cmsmith 13y ago

I would imagine that increasing the spacing between the cells actually fixed the problem, while the case and vent are just limiting the PR and financial liability.

pootch 13y ago

From an electrical engineering standpoint, that makes no sense. Thermal runaway starts when too much power is being drawn from the batteries and they begin to overheat until exploding or melting, their promixity to each other may limit the damage of an overloaded or malfunctioning cell, however the core problem remains, why are 787 electronic systems overloading the batteries? If one cell explodes or melts, you still essentially have a fire in progress. Protecting the other cells buys you time, but how much time do you have when there is fire on a plane? Obviously its a design issue, probably very complex that Boeing simply doesnt have the time and money to investigate thoroughly. So this is a patch. Nothing I have read indicates an engineering approach was taken to prevent the previous result.

hkmurakami 13y ago

pooch, your post is appearing as [dead] to me so your account may be hellbanned, which you may want to get fixed since you've made an informative post that many users won't be able to see.

azth 13y ago
Can you copy/paste it?
- uvdiv 13y ago
  "From an electrical engineering standpoint, that makes no sense. Thermal runaway starts when too much power is being drawn from the batteries and they begin to overheat until exploding or melting, their promixity to each other may limit the damage of an overloaded or malfunctioning cell, however the core problem remains, why are 787 electronic systems overloading the batteries?" "If one cell explodes or melts, you still essentially have a fire in progress. Protecting the other cells buys you time, but how much time do you have when there is fire on a plane?" "Obviously its a design issue, probably very complex that Boeing simply doesnt have the time and money to investigate thoroughly." "So this is a patch. Nothing I have read indicates an engineering approach was taken to prevent the previous result." https://news.ycombinator.com/item?id=5740563 https://news.ycombinator.com/item?id=5740563
deleted 13y ago
[deleted]

neurotech1 13y ago

The spacing between the cells minimizes the chance of a multi-cell cascading fire. I think they also changed the charging controller to better monitor the battery status and charge/discharge current. Changing the controller was part of the "fix". I'm guessing at some point, they'll make a change to the Lithium cell chemistry for enhanced safety. Changing the chemistry of the battery, and controller software updates is the real fix. The rest is just failure mitigation.