结论：低温下容量下降是可逆的，低温充电造成的损伤不是

冬季续航缩短，使用者常以为电池坏了。实际上低温下的容量下降多数是可逆的——温度回升后，可用容量基本恢复。这一点如果说明书里讲清楚，能减少很多不必要的售后。

但有一类损伤是不可逆的：在过低的温度下充电。这会造成锂在负极析出，容量永久损失，并且析出物累积到一定程度还有安全隐患。这个区别是低温使用的核心知识点。

低温影响的机理

影响 原因 是否可逆
可用容量下降 低温下电化学反应速率下降 可逆
内阻上升 电解液黏度增加，离子迁移受阻 可逆
输出功率下降 内阻上升导致压降增大 可逆
低温充电析锂 负极嵌锂速率跟不上电流 不可逆
机械阻力增加 润滑脂黏度上升 可逆

最后一行常被忽略。 冬季续航下降不全是电池的问题——轴承、传动部件的润滑脂在低温下黏度上升，滚动阻力增加，整车能耗上升。所以低温续航衰减是电池和机械两方面叠加的结果。

可逆与不可逆的区分方法

判断某次容量下降是可逆还是不可逆，方法是在常温下恢复一段时间后重新测容量：

恢复到接近原值的，属于可逆的低温效应；恢复后仍明显低于原值的，说明发生了永久性损伤，要追查是否发生过低温充电或其他滥用。

这个方法在处理使用者投诉时很有用。 使用者说「冬天电池不行了」，先让产品在常温下静置一段时间再测，就能区分是正常的低温现象还是真的损坏。

低温充电的风险与防护

低温充电的危险在于它的隐蔽性：充电过程看起来正常，指示灯正常，容量也在增加，但内部已经在发生析锂。损伤是累积的，可能几十次之后才表现出明显的容量下降或者更严重的问题。

防护手段包括：

BMS 温度判定。 低于设定温度时禁止充电。这是基本要求。

加热功能。 部分产品带电池加热，低温时先加热到允许温度再充电。成本较高但体验好。

使用提示。 说明书明确说明低温不能充电，并建议将电池移至室温环境后再充。

温度显示。 让使用者能看到当前电池温度，理解为什么暂时不能充电。

第三项的实际效果依赖使用者配合，所以第一项的可靠性更重要——即使使用者不知道，系统也应当阻止。

验证怎么做

低温相关的验证建议包括几项：

不同温度下的容量测量。 在几个温度点分别测可用容量，形成温度与容量的对应关系。这组数据是标注和说明的依据。

低温下的输出能力。 不只看容量，还要看能不能提供足够的功率。有的产品在低温下容量尚可但推不动，因为内阻上升导致压降过大。

低温充电保护的有效性。 在保护阈值附近逐步降温，确认保护确实动作。

恢复性验证。 低温放置后回到常温，确认性能恢复情况。

加热功能的验证（如有）。 加热是否能在合理时间内把电池升到允许温度，加热本身的能耗和安全性。

标注与说明的建议

续航标注应当说明测试温度。只给一个数字而不说温度条件，冬季使用者达不到就会产生落差。

说明书中建议包含：低温下续航会下降，这是正常现象；低于某温度不能充电，以及为什么；冬季使用的建议（比如室内存放、充电前回温）；如何判断电池是否真的损坏。

把「为什么」讲清楚比只给禁令有效。 使用者理解了析锂的道理，遵守的意愿会高很多。

设计上的考虑

面向寒冷地区市场的产品，可以从几个方向改善：选择低温性能较好的电芯体系；在电池包设计中考虑保温；配置加热功能；在控制策略上做低温补偿，避免低温下大电流放电加剧压降。

保温设计是性价比较高的一项——电池在使用中自身发热，良好的保温能让这部分热量维持电池温度，成本远低于主动加热。

存放条件的影响

除了使用中的低温，存放条件同样影响电池状态。冬季长期存放在无供暖的车库、阳台，电池处于低温环境，虽然不充放电，但如果荷电状态过低或过高，仍可能加速老化。

说明书中建议给出存放指引：存放前充到什么程度、存放环境的温度范围、长期存放期间多久补充一次电。这几条的依据同样应当来自验证数据，而不是套用通用建议。

使用者沟通的方式

低温性能是技术问题，但沟通对象是普通使用者。表述方式建议具体化：与其说「低温下容量下降」，不如说「冬季室外使用时，续航可能比夏季明显缩短，这是正常现象，回到室温后会恢复」。

给出可操作的建议比给出原理更有用：出门前在室内充电、停放时尽量在室内、长途出行预留更多余量。

低温对其他部件的影响

低温影响的不只是电池。控制器的电子元件在低温下参数会漂移；显示屏的响应变慢甚至显示异常；塑料件变脆，抗冲击能力下降；密封件变硬，防水性能可能下降。

做低温验证时建议一并考察这些部件，而不只盯着电池。实际的冬季故障里，显示屏和塑料件的问题并不少见。

我们的做法

做低温相关验证时，我们会分别记录低温下的性能和恢复常温后的性能，两组数据对比才能区分可逆与不可逆。只测低温性能，无法判断产品是否发生了损伤。

对于销往温差大地区的产品，建议把低温充电保护单独做透，并在低温边界附近多取几个点，确认保护动作点的准确性。这项保护失效的后果是累积且不可见的，值得多花验证成本。

有需要可以把电池体系和目标市场的温度条件发过来一起定验证方案，或者直接联系：132 4819 8029。检测能力见服务介绍，产品分类见电动轮椅检测与代步车检测，联系方式见联系我们。

English version

Conclusion. Shorter range in winter leads users to assume the battery has failed. In fact most cold-temperature capacity loss is reversible: usable capacity largely returns once temperature rises. Stating that clearly in the instructions prevents a good deal of unnecessary service contact. One kind of damage is not reversible, however: charging at too low a temperature causes lithium to plate on the anode, permanently reducing capacity and, as deposits accumulate, creating a safety concern. That distinction is the central point about cold-weather use.

Mechanisms. Usable capacity falls because electrochemical reaction rates decline, which is reversible. Internal resistance rises because electrolyte viscosity increases and ion transport is impeded, also reversible. Output power falls because higher resistance produces greater voltage drop, again reversible. Lithium plating during cold charging occurs because the anode cannot intercalate lithium as fast as the current delivers it, and this is not reversible. Mechanical resistance also rises as grease viscosity increases, which is reversible.

The mechanical contribution is easily overlooked. Winter range loss is not attributable to the battery alone: grease in bearings and transmission components thickens, rolling resistance rises and vehicle consumption increases. Cold-weather range loss is the combination of battery and mechanical effects.

Distinguishing reversible from permanent loss. Allow the product to recover at normal temperature for a period and remeasure capacity. Recovery to near the original value indicates a reversible cold effect. Capacity remaining markedly low after recovery indicates permanent damage, prompting investigation of whether cold charging or other abuse occurred. This is a useful method when handling complaints: a user reporting that the battery no longer works in winter can be addressed by letting the product stand at room temperature and remeasuring, which distinguishes normal cold behaviour from genuine damage.

Cold charging: risk and protection. The hazard lies in its invisibility. Charging appears normal, indicators behave normally and capacity does increase, while plating proceeds internally. Damage accumulates and may only become evident after dozens of cycles as marked capacity loss or something more serious. Protections include BMS temperature judgement inhibiting charging below a threshold, which is the basic requirement; battery heating to bring the pack to a permitted temperature before charging, which costs more but serves the user better; instructions stating clearly that charging must not occur when cold and suggesting the battery be brought indoors first; and temperature display so users understand why charging is temporarily unavailable. The instruction route depends on user cooperation, which makes the reliability of the automatic protection more important: the system should prevent it even when the user does not know.

Verification. Measure usable capacity at several temperatures to establish the relationship, which forms the basis for claims and explanations. Measure output capability as well as capacity, since some products retain reasonable capacity while being unable to drive, because raised internal resistance produces excessive voltage drop. Verify cold-charge protection by cooling gradually towards the threshold and confirming it acts. Verify recovery by returning to normal temperature after cold storage. And where heating is fitted, verify that it raises the pack to a permitted temperature in a reasonable time, and check its own energy consumption and safety.

Claims and instructions. State the test temperature alongside any range figure, since a bare number that winter users cannot achieve creates disappointment. Instructions should explain that reduced winter range is normal, that charging below a stated temperature is prohibited and why, what to do in winter such as indoor storage and warming before charging, and how to tell whether the battery is genuinely damaged. Explaining why works better than issuing a prohibition: users who understand plating are considerably more likely to comply.

Design considerations. For cold markets, select cell chemistries with better low-temperature behaviour, design thermal insulation into the pack, fit heating, and apply low-temperature compensation in control strategy to avoid high-current discharge worsening voltage drop. Insulation offers good value, since the battery generates heat in use and good insulation retains it, at far lower cost than active heating.

How we handle it. We record performance both at low temperature and after recovery, because only the comparison distinguishes reversible from permanent effects. For products sold into regions with large temperature variation we suggest examining cold-charge protection thoroughly with several points near the threshold, since failure there is cumulative and invisible.

Send us the cell chemistry and the temperature conditions of your target market and we will design the verification. Phone or WeChat: +86 132 4819 8029.