Monday, November 19, 2007
聯盟起反應對爆炸的細胞 Categories - Industry, Events, Electric, Racing , trackback 
接著在決定由挪威聯盟 停止所有EP賽跑 到目前為止直到新年以回應爆炸NiMh細胞安全危險，一定數量的其他國家也起了反應，沒有作為嚴密地。 鄰居瑞典決定取締某一批觸犯的IB4200細胞，和有比利時，并且賽跑將繼續作為法線，而BRCA在英國在最佳的途中勸告他們的成員處理，使用和充電NiMh細胞。 同時智力電池Co。 現在供應了也許包含細胞可能潛在地爆炸，當服從對種族類型情況時的批號。
這裡點擊讀受影響的細胞並且BRCA推薦名單…
智力電池Co。 現在供應了以下細胞批沒有』 s.，也許包含細胞可能爆炸，當服從對種族類型情況時：-
ARAET， AZCWT， BNCWT， BNDST， BRAET， BZAWT。
我們必須注重批沒有』 s。 詳細從回歸仅被編寫了由歐洲顧客到智力。 也許有其他批我們未被通報。 (如此，不要假設那，如果批沒有。 不是它在它裡面沒有任何問題細胞)的詳細上述，那。 一些歐共體司機得到細胞直接地從美國等等。 并且它是可能的未被通報對我們的批在歐共體之外可能也受影響。
智力供應同一個細胞在`顧客設計了抽縮』。 智力未證實同樣批代碼是否在細胞的這些版本使用。 被接受了的大多報告在智力抽縮看來是與細胞相關。 有希望地上述信息將包括大多問題。
您讀了或聽見了電池故事爆炸，并且的無疑義挪威聯盟臨時地暫停了所有電賽跑。 我們監測這些事件，但獲得無可磨滅的事實不是容易，使它難總結任何意味深長的結論。
假設有數以萬計細胞在循環，這樣事件從前是極為罕見的。 在英國發生了迄今是的唯一的嚴肅的事件接收器組裝吹了，那永久地損壞了人的眼力。 Although there will have been more injuries caused by scalpels or super glue in eyes than caused from exploding cells, you still need to take care!
The NiMh cells have a chemistry that allows the cell to ’self-discharge’ over a relatively short period, (days as opposed to weeks). Lately, some of the 4200 cells seem to self-discharge more rapidly than other/previous versions. More importantly the amount each individual cell within a pack discharges varies (i.e. cell 1 might be .9v, cell 2 .8v, cell 3 .9v, cell 4 .7v, etc.)
If charged in this state, some chargers will not know when to stop the charge process, as some cells are demanding to continue with the charge, whilst others could be over charged. It is also important to control the delta peak (voltage drop-off after completed charge) to a low value when charging. Once the cell has achieved full charge, any further charging will produce gas. The cells have a pressure vent, but if that is blocked or not working, the gas pressure could cause an explosion.
High charge rates will also produce more gas and reduce the cells useful life. It is possible that internal gas pressure may cause distortion to some internal parts that could result in a short circuit within the cell. An internal short circuit combined with gas pressure is likely to be a ‘big bang’.
Drivers need to recognise that the ‘matchers’ recommendations are intended to achieve maximum performance. It is the recommendation from the cell manufacturer that should be used.
Best Practice for use of NiMH cells.
1. Equalise cells before charging if they have been stored (with charge) for more than 2/3 days. If any of the cells in the pack show that they do not need to be equalised (i.e. the light does not show or goes out straight away) then remove the pack from the equaliser and charge for a short period (approx. 5 mins. should be adequate). Then carry out the equalising process.
2. Never exceed the manufacturers recommended fast charge rate. This should be 1C max., even if the manufacturer states higher. (C being rate of charge based on capacity of the cell, e.g. a 4200 mAh cell = 4.2 amps)
3. Disregard any charge rate recommendations by the ‘matcher’ if it is more than 1C.
4. Use a maximum Delta-Peak setting of 3mV per cell (6-cell pack = 3mV x 6 = 0.018V).
5. Never repeak cells after main charge.
6. Use a temperature cut-out as an additional safety feature set at 42 deg. C max., located on the hottest cell (usually middle cell). If charging on a cold day then consider reducing this to around 35 deg. C.
7. Allow cells to fully cool to ambient temperature before further charges. Be aware the centre of the cell cools slower than the outer casing. Do not put them in water to cool down; in an emergency cover the cells with a damp/wet cloth if you have to quickly cool them.
8. Store cells with some charge (30/50%).
Source: BRCA [brca.org]
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Comments
IB should be held responsible for the quality of their batteries. Has a lawsuit been placed for the person who has lost their site?
no lawsuits
The above reccomendations for nimh cell care, does this specifically apply to the IB4200 cells, or is it a good general guideline for all cells, such as GP3300’s, 3700’s, etc., etc. ???
I think its more directed towards the IB42s as they are the batteries at the moment with the major “exploding” issues and so on. But its recommendations I would use on the GPs to keep them in top form to as ive seen GP cells explode to!
[…] will soon release the follow up to the explosive power of their IB4200 cells with the introduction of the all new IB4600VR-1. These new batteries not only […]