t**********3
发帖数: 12623 | 1 October 4, 2013
About the Model?S fire
By Elon Musk, Chairman, Product Architect & CEO
Earlier this week, a Model?S traveling at highway speed struck a large metal
object, causing significant damage to the vehicle. A curved section that
fell off a semi-trailer was recovered from the roadway near where the
accident occurred and, according to the road crew that was on the scene,
appears to be the culprit. The geometry of the object caused a powerful
lever action as it went under the car, punching upward and impaling the
Model?S with a peak force on the order of 25 tons. Only a force of this
magnitude would be strong enough to punch a 3 inch diameter hole through the
quarter inch armor plate protecting the base of the vehicle.
The Model?S owner was nonetheless able to exit the highway as instructed by
the onboard alert system, bring the car to a stop and depart the vehicle
without injury. A fire caused by the impact began in the front battery
module – the battery pack has a total of 16 modules – but was contained to
the front section of the car by internal firewalls within the pack. Vents
built into the battery pack directed the flames down towards the road and
away from the vehicle.
When the fire department arrived, they observed standard procedure, which
was to gain access to the source of the fire by puncturing holes in the top
of the battery's protective metal plate and applying water. For the Model?S
lithium-ion battery, it was correct to apply water (vs. dry chemical
extinguisher), but not to puncture the metal firewall, as the newly created
holes allowed the flames to then vent upwards into the front trunk section
of the Model?S. Nonetheless, a combination of water followed by dry chemical
extinguisher quickly brought the fire to an end.
It is important to note that the fire in the battery was contained to a
small section near the front by the internal firewalls built into the pack
structure. At no point did fire enter the passenger compartment.
Had a conventional gasoline car encountered the same object on the highway,
the result could have been far worse. A typical gasoline car only has a thin
metal sheet protecting the underbody, leaving it vulnerable to destruction
of the fuel supply lines or fuel tank, which causes a pool of gasoline to
form and often burn the entire car to the ground. In contrast, the
combustion energy of our battery pack is only about 10% of the energy
contained in a gasoline tank and is divided into 16 modules with firewalls
in between. As a consequence, the effective combustion potential is only
about 1% that of the fuel in a comparable gasoline sedan.
The nationwide driving statistics make this very clear: there are 150,000
car fires per year according to the National Fire Protection Association,
and Americans drive about 3 trillion miles per year according to the
Department of Transportation. That equates to 1 vehicle fire for every 20
million miles driven, compared to 1 fire in over 100 million miles for Tesla
. This means you are 5 times more likely to experience a fire in a
conventional gasoline car than a Tesla!
For consumers concerned about fire risk, there should be absolutely zero
doubt that it is safer to power a car with a battery than a large tank of
highly flammable liquid.
— Elon
? Below is our email correspondence with the Model?S owner that
experienced the fire, reprinted with his permission:
From: robert Carlson
Sent: Thursday, October 03, 2013 12:53 PM
To: Jerome Guillen
Subject: carlson 0389
Mr. Guillen,
Thanks for the support. I completely agree with the assessment to date. I
guess you can test for everything, but some other celestial bullet comes
along and challenges your design. I agree that the car performed very well
under such an extreme test. The batteries went through a controlled burn
which the internet images really exaggerates. Anyway, I am still a big fan
of your car and look forward to getting back into one. Justin offered a
white loaner--thanks. I am also an investor and have to say that the
response I am observing is really supportive of the future for electric
vehicles. I was thinking this was bound to happen, just not to me. But now
it is out there and probably gets a sigh of relief as a test and risk issue-
this "doomsday" event has now been tested, and the design and engineering
works.
rob carlson
? On Oct 3, 2013, at 12:29 PM, Jerome Guillen wrote:
Dear Mr. Carlson:
I am the VP of sales and service for Tesla, reporting directly to Elon Musk,
Tesla's CEO.
I am sorry to hear that you experienced a collision in your Model?S 2 days
ago. We are happy that the Model?S performed in such a way that you were not
injured in the accident and that nobody else was hurt.
I believe you have been in contact with Justin Samson, our service manager,
since the accident. We are following this case extremely closely and we have
sent a team of experts to review your vehicle. All indications are that
your Model?S drove over large, oddly-shaped metal object which impacted the
leading edge of the vehicle's undercarriage and rotated into the underside
of the vehicle ("pole vault" effect). This is a highly uncommon occurrence.
Based on our review thus far, we believe that the Model?S performed as
designed by limiting the resulting fire to the affected zones only. Given
the significant intensity of the impact, which managed to pierce the 1/4
inch bottom plate (something that is extremely hard to do), the Model?S
energy containment functions operated correctly. In particular, the top
cover of the battery provided a strong barrier and there was no apparent
propagation of the fire into the cabin. This ensured cabin integrity and
occupant safety, which remains our most important goal.
We very much appreciate your support, patience and understanding while we
proceed with the investigation. Justin keeps me closely informed. Please
feel free to contact me directly, if you have any question or concern.
Best regards,
Jerome Guillen I VP, WW sales and service
? Tesla Motors | 3500 Deer Creek Road | Palo Alto, CA 94304
Privacy Policy | Unsubscribe ? | c*******9
发帖数: 9032 | 2 新浪科技讯 北京时间10月5日早间消息，特斯拉(180.98, 7.67, 4.43%)(TSLA)CEO艾伦
-马斯克(Elon Musk)周五发表博客文章解释Model S起火事件，成功安抚投资者并促使
该公司股价反弹4.43%，收于180.98美元。
视频：特斯拉Model S电动汽车因发生撞击着火
媒体来源：新浪科技
这是教科书一般的危机公关案例。
事件缘起于周三，一辆特斯拉Model S起火的视频流传网络，点燃了公众及投资者
对于电动汽车安全性的担忧。特斯拉股价自周三下午视频传出后迅速下跌，并在第二天
继续下探。周三和周四两个交易日，特斯拉股价由192.99美元跌至173.23美元，跌幅为
10.24%，或19.76美元，市值损失约24亿美元。
尽管特斯拉Model S型电动车曾在安全碰撞测试中获得美国公路交通安全管理局(
NHTSA)的最高分5.4星，公众仍然对于电动车这一相对新生事物的安全性存有一定程度
的怀疑。投资者也普遍认为，潜在的重大安全事故将对腾飞了半年多的特斯拉股价造成
冲击。2013年3月中旬的时候，特斯拉股价还在35美元上下徘徊，2013年9月底，该股便
创下了194.5美元历史最高。利好出不尽，就怕黑天鹅。
投资者显然应该庆幸，特斯拉拥有最优秀的管理者。黑天鹅伴着火焰飞来的当天，
还没等股市收盘，特斯拉的全球公关总监(Director of Global Communications)伊丽
莎白-贾维斯-辛(Elizabeth Jarvis-Shean)就发布了紧急声明，虽承认着火的车辆就是
一辆Model S，但是她解释该车是在发生重大撞击之后才起火，并非自燃。并且，该车
的警报系统显示车辆故障，并“指引”司机将车安全地停在了路边。
她说：“没有人在该事故中受伤，该车的唯一驾乘人员也有充分的时间安全离开驾
驶舱并报警。由于该车设计和构造，大火仅仅局限在车头的部位，所有迹象都显示火焰
没有进入内部驾驶舱。”
这一声明的中心思想是：这一次事故(反而)证明，特斯拉很智能(能“指引”驾驶
员靠边停车并安全撤离，颇有《钢铁侠》中J.A.R.V.I.S。的风范)，特斯拉非常安全(
“由于该车设计和构造，大火仅仅局限在车头的部位，所有迹象都显示火焰没有进入内
部驾驶舱”)。
“钢铁侠”本人显然更精于公关之道。这位经常在twitter上挑逗投资者的创业偶
像兼技术天才兼理想主义化身，在周五发表博客文章雄辩地向公众证明，特斯拉电动车
极其安全，起火的可能性仅仅是传统燃油汽车的1/5。
马斯克说首先说明，起火是由罕见的事故引起的。该车在高速行驶中撞到路中央一
个从半挂车辆上脱落的弯曲金属物体，该物体对汽车底部1/4英寸厚的电池保护装甲施
加了高达25吨的巨大冲击力，造成了直径3英寸的一个穿孔。这段话的宗旨是突出坚固
的电池保护装甲，解释事故原因是次要目的。
接着，他又详细解释了Model S底部16个由防火墙隔离的电池仓结构，“顺便”提
到了火势只向下方而不是向上方或驾驶舱发展的情况。
然后，钢铁侠指责了消防部门，是他们错误的灭火方法才让火势蔓延至整个车头。
不过即便是遭遇这么笨的消防员，火势也始终没有进入驾驶舱，并且，马斯克表示，如
果是传统燃油车，大火早就把整车烧成灰了。言外之意是：电动车着火最多只是帮你取
暖，汽油车着火则可能将你火化。
最后，geeky范儿的马斯克引用了数据再给公众吃下一刻定心丸：在美国，平均每
2000万行驶里程发生一起汽车火灾，而特斯拉则是每1亿行驶里程才发生一起火灾。“
驾驶传统汽油车遭遇火灾的可能性是驾驶特斯拉的5倍”。
结论是：“对于担心火灾危险的消费者来说，使用电池比使用一箱高度可燃的液体
来驱动一辆汽车要更安全，这一点应该绝对没有任何疑问。“
除此之外，马斯克还在文章的结尾附上了事故车驾驶员与特斯拉一位副总裁之间的
电子邮件记录。那位驾驶员居然也是特斯拉投资者，他提出：”汽车电池经历了一次‘
可控燃烧’，但是互联网上的图片显然夸张了。”
读到了这样完美的危机公关声明，投资者出了一口长气。国会的议员非常不靠谱，
但钢铁侠显然是值得追随的老大。用钱投票的结果，就是股价反弹4.43%，重现站在了
180美元上方。并且盘后交易时段又上涨了1.2%。
特斯拉的股价是否被高估笔者不敢妄下定论，读者自有高见，但是特斯拉的危机公
关应变能力，和马斯克本人与公众互动的水平，显然被低估了。如果当年乔布斯也能像
马斯克这样煽动他的教徒，苹果(483.03, -0.38, -0.08%)公司的股价可能早就突破
1000美元了，卖掉一部分市值帮助美国政府重新开门都没有太大压力。(苜蓿) | b********6
发帖数: 35437 | 3 简单地说这辆车在高速上行驶的时候电池被杂物击穿起火
这要是在高速上击了了小洞，回家停车后开始曼延，那不是要把整个房子烧掉？ | l********7
发帖数: 1077 | | l**t
发帖数: 6971 | 5
赞“杂物”。。。
【在 b********6 的大作中提到】
: 简单地说这辆车在高速上行驶的时候电池被杂物击穿起火
: 这要是在高速上击了了小洞，回家停车后开始曼延，那不是要把整个房子烧掉？
| t********i
发帖数: 7856 | 6 正解。
BYD E6 还是被两辆车撞击后才起火的。虽然烧死了3个人。
【在 b********6 的大作中提到】
: 简单地说这辆车在高速上行驶的时候电池被杂物击穿起火
: 这要是在高速上击了了小洞，回家停车后开始曼延，那不是要把整个房子烧掉？
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