https://tech.slashdot.org/story/16/12/05/2032203/engineers-explain-why-the-g...
whoops. *sigh*.... so i'll be increasing the laptop's height by 1mm. argh. that's a big redesign...
l.
Well, that depends. One neat (but silly) tech magazine that publishes (effectively) only adverts and warnings (regular machines may be boring or rubbish) published a lovely, glowing review of the galaxy firestorm (or whatever the actual name is) saying it's great giving 4/5 -- apart from the issue that it melts ;)
On 6 December 2016 at 19:01, Luke Kenneth Casson Leighton lkcl@lkcl.net wrote:
https://tech.slashdot.org/story/16/12/05/2032203/engineers-explain-why-the-g...
whoops. *sigh*.... so i'll be increasing the laptop's height by 1mm. argh. that's a big redesign...
l.
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On 12/06/2016 02:01 PM, Luke Kenneth Casson Leighton wrote:
https://tech.slashdot.org/story/16/12/05/2032203/engineers-explain-why-the-g...
whoops. *sigh*.... so i'll be increasing the laptop's height by 1mm. argh. that's a big redesign...
Does the laptop housing have the same design flaw? That's a stunning coincidence.
Well, it's a lucky catch.
@Luke, as to tolerances, will you match the tolerances as described by the expert report, or will you adjust and add an additional tolerance on top?
R
On 6 December 2016 at 19:13, Julie Marchant onpon4@riseup.net wrote:
On 12/06/2016 02:01 PM, Luke Kenneth Casson Leighton wrote:
https://tech.slashdot.org/story/16/12/05/2032203/engineers-explain-why-the-g...
whoops. *sigh*.... so i'll be increasing the laptop's height by 1mm. argh. that's a big redesign...
Does the laptop housing have the same design flaw? That's a stunning coincidence.
-- Julie Marchant https://onpon4.github.io
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On 12/6/16, Russell Hyer russell.hyer@gmail.com wrote:
Well, it's a lucky catch.
@Luke, as to tolerances, will you match the tolerances as described by the expert report, or will you adjust and add an additional tolerance on top?
6mm + 10% => 6.6mm - i'm adding 1.0 so 7mm.
l.
On 12/6/16, Julie Marchant onpon4@riseup.net wrote:
On 12/06/2016 02:01 PM, Luke Kenneth Casson Leighton wrote:
https://tech.slashdot.org/story/16/12/05/2032203/engineers-explain-why-the-g...
whoops. *sigh*.... so i'll be increasing the laptop's height by 1mm. argh. that's a big redesign...
Does the laptop housing have the same design flaw?
the battery is radically different: it's an e-bike battery, it's going to be robust as hell (capable of delivering far more than what is being asked of it), so it's simply not going to be made of layers as thin as the samsung battery...
... also bear in mind that the base is wood: it would flex...
... but i still don't wish to take any risks, so i'll be increasing the base height by 1mm. it's a single parameter (i've adjusted it before) but i still have to do a thorough review / walk-round in the CAD. and re-print everything. *sigh*.
l.
On 12/06/2016 04:00 PM, Luke Kenneth Casson Leighton wrote:
the battery is radically different: it's an e-bike battery, it's going to be robust as hell (capable of delivering far more than what is being asked of it), so it's simply not going to be made of layers as thin as the samsung battery...
... also bear in mind that the base is wood: it would flex...
... but i still don't wish to take any risks, so i'll be increasing the base height by 1mm. it's a single parameter (i've adjusted it before) but i still have to do a thorough review / walk-round in the CAD. and re-print everything. *sigh*.
Then it sounds like you don't have anything to worry about. Keep in mind, Samsung's whole debacle came about because they were trying to hard to squeeze as much battery life as possible into the phone.
Also, consider the OpenPandora, which has a design that actively requires some amount of pressure to be on the battery at all times because of how the connector works.
Actually, are you even using a LiPo battery? Plain Li-ion batteries are rigid and don't have this problem.
On 12/6/16, Julie Marchant onpon4@riseup.net wrote:
On 12/06/2016 04:00 PM, Luke Kenneth Casson Leighton wrote:
the battery is radically different: it's an e-bike battery, it's going to be robust as hell (capable of delivering far more than what is being asked of it), so it's simply not going to be made of layers as thin as the samsung battery...
... also bear in mind that the base is wood: it would flex...
... but i still don't wish to take any risks, so i'll be increasing the base height by 1mm. it's a single parameter (i've adjusted it before) but i still have to do a thorough review / walk-round in the CAD. and re-print everything. *sigh*.
Then it sounds like you don't have anything to worry about. Keep in mind, Samsung's whole debacle came about because they were trying to hard to squeeze as much battery life as possible into the phone.
Also, consider the OpenPandora, which has a design that actively requires some amount of pressure to be on the battery at all times because of how the connector works.
i'll be soldering wires onto the tabs (they're enormous: about 20mm x 30mm). with an inline 6A fuse.
Actually, are you even using a LiPo battery? Plain Li-ion batteries are rigid and don't have this problem.
just reading the datasheet... Lithium Ion (LiCoMn)
should be here:
http://hands.com/~lkcl/eoma/laptop_15in/EV%20GPNCM62135160%2010Ah%20NiCoMn%2...
The "URL" says <NiCoMn> as Nickel, not <LiCoMn> as Lithium. Which is right?
On 16.12.6 16:30, Luke Kenneth Casson Leighton wrote:
On 12/6/16, Julie Marchant onpon4@riseup.net wrote:
~~~~~
Actually, are you even using a LiPo battery? Plain Li-ion batteries are rigid and don't have this problem.
just reading the datasheet... Lithium Ion (LiCoMn)
should be here:
http://hands.com/~lkcl/eoma/laptop_15in/EV%20GPNCM62135160%2010Ah%20NiCoMn%2...
On Wed, Dec 7, 2016 at 12:07 PM, chadvellacott@sasktel.net wrote:
The "URL" says <NiCoMn> as Nickel, not <LiCoMn> as Lithium. Which is right?
The PDF that the URL links to says:
"Li-ion(NiCoMn) Polymer Battery Cell Specification"
So its a lithium ion nickel polymer battery? Haha I have no idea what I'm reading.
On 16.12.6 16:30, Luke Kenneth Casson Leighton wrote:
On 12/6/16, Julie Marchant onpon4@riseup.net wrote:
> >> Actually, are you even using a LiPo battery? Plain Li-ion batteries are >> rigid and don't have this problem. > > > just reading the datasheet... Lithium Ion (LiCoMn) > > should be here: > > > http://hands.com/~lkcl/eoma/laptop_15in/EV%20GPNCM62135160%2010Ah%20NiCoMn%20battery%20cell.pdf > _______________________________________________ arm-netbook mailing list arm-netbook@lists.phcomp.co.uk http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook Send large attachments to arm-netbook@files.phcomp.co.uk
On Tue, 6 Dec 2016 19:01:47 +0000 Luke Kenneth Casson Leighton lkcl@lkcl.net wrote:
https://tech.slashdot.org/story/16/12/05/2032203/engineers-explain-why-the-g...
whoops. *sigh*.... so i'll be increasing the laptop's height by 1mm. argh. that's a big redesign...
The root of the article is a blog post[1] by a company specialized in finding and fixing such issues, where they analyzed the issue by buying and taking apart a Galaxy Note 7. The article also heavily try to promote the services that this company offers.
The information was then picked by a review magazine that wrote a journalistic article[2] with that information.
The journalistic article was then picked by slashdot.
It would probably be wiser to ask battery experts before taking any decision, since: - That company tried to promote their services. - They don't point to documentation or information on the margin they refer to. - The battery technology is probably different on the EOMA laptop. - The casing is probably different too. - That laptop will probably be used for a time that is way longer than the average use time for consumer smartphones. - The average customers for common smartphones don't mess with them, open the device, access the PCB, etc...
What if, for instance: - You need more space than the 10% figure they mentioned? You probably don't want to redesign it twice, and you probably don't want to make unsafe laptop either, especially because they will probably be used for a very long time by people messing with them. - You don't need to redesign the laptop because the problem doesn't apply it.
References: ----------- [1]https://www.instrumental.ai/blog/2016/12/1/aggressive-design-caused-samsung-... [2]http://www.digitaltrends.com/mobile/instrumental-galaxy-note-7-teardown-news...
Hi,
I wonder if Vauxhall (UK's division of General Motors (or these days, general unexplained electrical fires...)) has any lessons for electrical wiring in computers. True, cars aren't exactly computers. But these days they're all wired like a computer and contain several just behind the dash. (And also, it's true that Vauxhall hasn't really released much info, but it's still something to watch, but perhaps it only occurs if / when companies are cutting corners to save a buck and General Motors is generally a company to which that way of working applies)
Russell
On 8 December 2016 at 08:44, Denis 'GNUtoo' Carikli GNUtoo@no-log.org wrote:
On Tue, 6 Dec 2016 19:01:47 +0000 Luke Kenneth Casson Leighton lkcl@lkcl.net wrote:
https://tech.slashdot.org/story/16/12/05/2032203/engineers-explain-why-the-g...
whoops. *sigh*.... so i'll be increasing the laptop's height by 1mm. argh. that's a big redesign...
The root of the article is a blog post[1] by a company specialized in finding and fixing such issues, where they analyzed the issue by buying and taking apart a Galaxy Note 7. The article also heavily try to promote the services that this company offers.
The information was then picked by a review magazine that wrote a journalistic article[2] with that information.
The journalistic article was then picked by slashdot.
It would probably be wiser to ask battery experts before taking any decision, since:
- That company tried to promote their services.
- They don't point to documentation or information on the margin they refer to.
- The battery technology is probably different on the EOMA laptop.
- The casing is probably different too.
- That laptop will probably be used for a time that is way longer than the average use time for consumer smartphones.
- The average customers for common smartphones don't mess with them, open the device, access the PCB, etc...
What if, for instance:
- You need more space than the 10% figure they mentioned? You probably don't want to redesign it twice, and you probably don't want to make unsafe laptop either, especially because they will probably be used for a very long time by people messing with them.
- You don't need to redesign the laptop because the problem doesn't apply it.
References:
[1]https://www.instrumental.ai/blog/2016/12/1/aggressive-design-caused-samsung-... [2]http://www.digitaltrends.com/mobile/instrumental-galaxy-note-7-teardown-news...
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Adam Van Ymeren -
chadvellacott＠sasktel.net -
Denis 'GNUtoo' Carikli -
Julie Marchant -
Luke Kenneth Casson Leighton -
Russell Hyer