WO2011060596A1 - 一种动力电池温度管理方法 - Google Patents

一种动力电池温度管理方法 Download PDF

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Publication number
WO2011060596A1
WO2011060596A1 PCT/CN2009/076247 CN2009076247W WO2011060596A1 WO 2011060596 A1 WO2011060596 A1 WO 2011060596A1 CN 2009076247 W CN2009076247 W CN 2009076247W WO 2011060596 A1 WO2011060596 A1 WO 2011060596A1
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Prior art keywords
battery
temperature
value
fan
fan opening
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PCT/CN2009/076247
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English (en)
French (fr)
Inventor
朴昌浩
张后亮
杨辉前
袁昌荣
苏岭
周安健
任勇
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重庆长安汽车股份有限公司
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Publication of WO2011060596A1 publication Critical patent/WO2011060596A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/615—Heating or keeping warm
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/617—Types of temperature control for achieving uniformity or desired distribution of temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6561—Gases
    • H01M10/6563—Gases with forced flow, e.g. by blowers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the invention belongs to the technical field of power battery systems, and in particular relates to a power battery temperature management control system for a hybrid vehicle.
  • Hybrid vehicles have significantly reduced fuel consumption and exhaust emissions compared to conventional internal combustion engines, and have become the mainstream of new vehicle development worldwide.
  • the power battery provides auxiliary power to the vehicle through the drive motor. It must meet the requirements of various operating conditions (idle speed, hill climbing, acceleration, deceleration braking, etc.) of the hybrid vehicle. The pros and cons of the vehicle seriously affect the performance of the vehicle.
  • Power battery temperature is a very important performance parameter of power battery. If the temperature is too high, too low or the temperature difference between the parts of the battery is too large, it will affect the performance of the power battery and reduce the service life of the power battery.
  • the object of the present invention is to provide a power battery temperature management method for the shortcomings of the prior art.
  • the method effectively prevents the power battery from being too hot, too low, and excessively large in temperature by controlling the battery fan to be turned on to properly ventilate the battery. , to make the battery work in the optimal working temperature range, to solve the impact of the battery temperature is too high, too low or excessive temperature difference on the power battery.
  • the power battery temperature management method proposed by the invention comprises a power battery over temperature control method, a power battery temperature low control method, and a power battery temperature difference excessive control method.
  • the method for controlling the temperature of the power battery is too high, that is, when the battery is charged and discharged, the battery temperature is too high, or the whole vehicle is in a high temperature environment, and the battery temperature is too high, the battery fan is turned on to prevent heat dissipation, and the battery is prevented from being overheated. Performance and longevity.
  • the method for controlling the temperature of the power battery is too low, that is, when the temperature of the battery is too low in a low temperature environment, the battery fan is controlled to be turned on after the warm air of the whole vehicle is turned on, and the temperature of the battery is accelerated by blowing a warm air into the battery pack. l, so that the battery temperature rises to the optimal working temperature as soon as possible.
  • the control method for excessive temperature difference of the power battery refers to that the local temperature of the battery is unbalanced, and the temperature deviation is too large.
  • the air circulation in the battery pack is accelerated by controlling the opening of the battery fan to balance the local temperature of the battery.
  • a power battery temperature management method the steps are as follows:
  • the temperature sensor distributed on the surface of the power battery collects the temperature of the plurality of surface points to reflect the operating temperature of the power battery, and transmits the temperature data to the power battery management system;
  • the temperature value collected by the power battery management system is compared to obtain the highest temperature value, the lowest temperature value, and the maximum temperature difference of the battery, that is, the difference between the highest temperature value and the lowest temperature value;
  • the battery over-temperature control method can control the opening degree of the battery fan according to the actual temperature of the battery by setting different battery temperature too high threshold points, so that the battery fan opening degree increases as the battery temperature increases. Large, effectively avoiding excessive battery temperature.
  • the battery temperature control strategy can use the air conditioning heater that is turned on in the low temperature environment to speed up the battery temperature rise. This increases the utilization of existing resources, without the need to add additional equipment, and can effectively avoid The battery temperature is too low.
  • the battery temperature difference control strategy can control the battery fan opening degree according to the actual temperature difference of the battery by setting different battery temperature difference too large threshold points, so that the battery fan opening degree increases with the increase of the battery temperature difference, effectively avoiding The battery temperature difference is too large.
  • the above-mentioned power battery temperature management method can effectively prevent the power battery temperature from being too high, too low, and the local temperature difference is too large, so that the battery works in the optimal working temperature range, and comprehensively protects the battery performance and life.
  • FIG. 1 is a general flow chart of a method for managing a temperature of a power battery according to the present invention.
  • FIG. 2 is a flow chart of a method for controlling excessive temperature of a power battery according to the present invention.
  • FIG. 3 is a flow chart of a method for controlling a low temperature of a power battery according to the present invention.
  • FIG. 4 is a flow chart of a method for controlling excessive temperature difference of a power battery according to the present invention.
  • Figure 1 shows the overall flow chart of the power battery temperature management method.
  • Power battery temperature is a very important performance parameter of power battery. If the temperature is too high, too low or the temperature difference between the battery parts is too large, it will affect the performance of the power battery and reduce the service life of the power battery. Therefore, the power battery temperature management is the power battery system. An important research topic in design and development.
  • the hybrid car In order to ventilate and dissipate the power battery, the hybrid car is equipped with a battery fan and a battery inlet and outlet duct.
  • Hybrid electric vehicle power battery surface is provided with a plurality of digital temperature sensors, which collect the temperature of a plurality of surface points to reflect the operating temperature of the power battery, and transmit the temperature data to the power battery management system.
  • the power battery management system compares the temperature values of the plurality of digital temperature sensors to obtain the highest temperature value, the lowest temperature value, the temperature difference (the difference between the highest temperature value and the lowest temperature value), and determines the power according to the power battery temperature excessive control method. Whether the battery temperature is too high and the corresponding battery fan opening value is 1; according to the power supply
  • the fan opening value is 3; finally, the battery fan opening values 1, 2, and 3 are compared to obtain the maximum value of the battery fan opening degree, and the opening degree is used to control the battery fan to open to ventilate the battery.
  • the method comprehensively considers that the power battery temperature is too high, too low, and the temperature difference is too large, which can fully protect the performance and life of the power battery.
  • the respective sub-control methods of the power battery temperature management method will be described in detail below with reference to the accompanying drawings.
  • the power battery has a certain operating temperature range according to its own performance. If the battery temperature reaches or exceeds the maximum operating temperature, it will seriously affect the battery charging and discharging efficiency and cycle life.
  • the battery temperature When the vehicle is running in a high temperature environment or the power battery is continuously cycled, the battery temperature will rise continuously and may reach or exceed the maximum operating temperature. Therefore, it is necessary to dissipate heat to the battery before the battery temperature reaches the maximum operating temperature to prevent the battery temperature from being too high.
  • the power battery management system sets different battery temperature too high and wide points N...3, 2, 1 according to the needs before the battery reaches the maximum working temperature.
  • the battery temperature is too high and the point is 1>
  • the temperature is too high and the threshold value is 2>...: >
  • the battery temperature is too high and the threshold value is N, and it corresponds to the different opening values of the battery fan.
  • the battery fan opening value increases linearly between different battery temperature and high threshold points. , wherein the lowest temperature is too high and the threshold value N corresponds to the battery fan starting to open, and the highest temperature threshold point 1 corresponds to the battery fan being fully open.
  • the power battery management system compares the temperature values collected by the plurality of temperature sensors on the surface of the battery to obtain the highest temperature value, and compares the value with the battery temperature too high threshold value to calculate the battery fan that is turned on due to the battery temperature being too high.
  • the opening value is transmitted to the battery fan opening value of 1.
  • step (3) Compare whether the highest battery temperature value exceeds the set battery temperature too high threshold value N, and if so, calculate the corresponding battery fan opening value and transmit the value to the battery fan opening value 1; if not, Then loop back to step (1).
  • the power battery has a certain operating temperature range according to its own performance. If the battery temperature is below the minimum operating temperature, it will seriously affect the battery charging and discharging efficiency and cycle life.
  • the battery temperature When the whole vehicle is driving in a low temperature environment, the battery temperature may be below the minimum operating temperature. The battery temperature rises as soon as possible to reach or exceed the minimum operating temperature to prevent the battery temperature from being too low.
  • the driver When the whole vehicle is in a low temperature environment, the driver will turn on the air conditioner and warm air.
  • the power battery management system compares the digital temperature values collected by the plurality of digital temperature sensors on the surface of the battery to obtain the highest temperature value, and the value and the battery are the lowest. The working temperature value is compared.
  • the battery fan is fully opened, and the warm air is blown into the battery pack to speed up the battery temperature until the battery temperature reaches the minimum operating temperature, and the battery fan is The opening value is transmitted to the battery fan opening value of 2; otherwise the battery fan is not turned on.
  • the power battery can only be used within a certain temperature difference according to its own performance.
  • the temperature difference of the battery reaches or exceeds the maximum temperature difference, which will seriously affect the battery performance and life.
  • the local temperature is not balanced, and the maximum temperature difference may be reached or exceeded. Therefore, it is necessary to ventilate the battery before the temperature difference of the battery reaches the maximum temperature difference to prevent the temperature difference of the battery from being too large.
  • the power battery management system sets different battery temperature differences from the small to large before the battery reaches the maximum temperature difference.
  • the temperature difference is too large. N...3, 2, 1 , that is, the battery temperature difference is too large. 1> Battery temperature difference Large value point 2>...: >The battery temperature difference is too large and the wide value point N, and corresponds to the different opening degree of the battery fan.
  • the temperature difference is too large.
  • the point value N corresponds to the battery fan starts to open, and the maximum temperature difference is too large.
  • the battery fan is fully open.
  • the power battery management system compares the temperature values collected by the plurality of temperature sensors on the surface of the battery to obtain the highest temperature value and the lowest temperature value, and calculates the maximum temperature difference value, and compares this value with the battery temperature difference excessively wide value point. If the temperature difference between the batteries is too large, the battery fan opening value to be turned on is turned on, and the value is transmitted to the battery fan opening value 3.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Description

一种动力电池温度管理方法 本申请要求于 2009 年 11 月 20 日提交中国专利局、 申请号为 200910191534.6、 发明名称为"一种动力电池温度管理方法"的中国专利申请的 优先权， 其全部内容通过引用结合在本申请中。
技术领域
本发明属于动力电池系统技术领域 ,尤其涉及混合动力汽车用动力电池温 度管理控制系统。
背景技术
随着全球气候逐步恶化、城市大气污染加剧和石油资源过度消耗， 发展节 能、环保汽车已成为世界汽车工业技术创新的重要方向和汽车产业可持续发展 的必然选择。混合动力汽车与传统内燃机汽车相比能大幅度降低燃油消耗和尾 气排放， 已成为世界范围内新型汽车开发的主流。
动力电池作为混合动力汽车的关键零部件，通过驱动电机给整车提供辅助 动力， 必须满足混合动力汽车各种运行工况（怠速、爬坡、加速、减速制动等） 的使用要求， 其性能的优劣严重影响整车性能。
动力电池温度是动力电池一个很重要的性能参数， 温度过高、过低或电池 局部之间温差过大都会影响动力电池使用性能， 降低动力电池的使用寿命。
国内外各汽车厂家都把动力电池温度管理作为混合动力汽车动力电池系 统设计开发的重要研究课题， 投入了大量的人力、 物力。 目前动力电池散热有 水冷、 风冷两种技术路线， 但由于水冷会给动力电池带来安全隐患， 且水冷技 术比较复杂， 设备成本较高， 故各汽车厂家主要釆用风冷技术。 而在已有技术 中， 主要考虑动力电池温度过高后用散热风扇给电池散热， 而没有针对动力电 池局部温度不均衡及动力电池温度过低釆取相应的控制措施，因此还存在很多 不足。
发明内容
本发明的目的是针对现有技术存在的不足，提出一种动力电池温度管理方 法，所述方法通过适时控制电池风扇开启给电池通风来有效避免动力电池温度 过高、 过低及局部温差过大， 使电池工作在最佳工作温度区间， 以解决电池温 度过高、 过低或温差过大对动力电池的影响。 本发明提出的动力电池温度管理方法由动力电池温度过高控制方法、动力 电池温度过低控制方法、 动力电池温差过大控制方法构成。
所述的动力电池温度过高控制方法是指电池循环充放电导致电池温度过 高或整车在高温环境下导致电池温度过高时，通过控制电池风扇开启给电池散 热， 防止温度过高影响电池使用性能及寿命。
所述的动力电池温度过低控制方法是指整车在低温环境下导致电池温度 过低时， 开启整车空调暖风后控制电池风扇开启， 通过给电池包内吹入暖风来 加快电池温升， 使电池温度尽快上升至最佳工作温度。
所述的动力电池温差过大控制方法是指电池局部温度不均衡， 温度偏差太 大， 通过控制电池风扇开启加快电池包内空气流通， 使电池各局部温度均衡。
本发明实现上述目的的具体技术方案如下：
一种动力电池温度管理方法， 其步骤如下：
( 1 ) 由动力电池表面分布的温度传感器釆集多个表面点的温度来反映动 力电池工作温度， 并将温度数据传送给动力电池管理系统；
( 2 ) 由动力电池管理系统将釆集到的温度值进行比较得出最高温度值、 最低温度值、 电池最大温差即最高温度值与最低温度值之差；
( 3 )根据动力电池温度过高控制方法判断动力电池温度是否过高， 如果 是， 则计算对应的电池风扇开度值 1；
( 4 )如果否， 则根据动力电池温度过低控制方法判断动力电池温度是否 过低， 如果是， 则计算对应的电池风扇开度值 2;
( 5 )如果否， 则根据动力电池温差过大控制方法判断动力电池温差是否 过大， 如果是， 则计算对应的电池风扇开度值 3;
( 6 )将电池风扇开度值 1、 2、 3进行比较， 得出电池风扇开度的最大值， 并用此开度值控制电池风扇开启给电池通风。
本方法中，电池温度过高控制方法能够通过设置不同的电池温度过高阔值 点，从而根据电池实际温度的高低控制电池风扇开度大小，使得电池风扇开度 随着电池温度升高而增大， 有效避免电池温度过高。
电池温度过低控制策略能够利用整车低温环境下开启的空调暖风来加快 电池温升。 这即加大了现有资源的利用率， 无需另外增加设备， 又能有效避免 电池温度过氐。
电池温差过大控制策略能够通过设置不同的电池温差过大阔值点，从而根 据电池实际温差的大小控制电池风扇开度大小，使得电池风扇开度随着电池温 差增大而增大， 有效避免电池温差过大。
综上所述， 上述动力电池温度管理方法能够有效避免动力电池温度过高、 过低及局部温差过大，使电池工作在最佳工作温度区间， 全面保护电池的使用 性能及寿命。
附图说明
图 1为本发明提出的动力电池温度管理方法的总体流程图。
图 2为本发明提出的动力电池温度过高控制方法的流程图。
图 3为本发明提出的动力电池温度过低控制方法的流程图。
图 4为本发明提出的动力电池温差过大控制方法的流程图。
具体实施方式
以下结合附图详细说明方法：
图 1给出了动力电池温度管理方法的总体流程图。
动力电池温度是动力电池一个很重要的性能参数， 温度过高、过低或电池 局部之间温差过大都会影响动力电池使用性能， 降低动力电池的使用寿命， 因 此动力电池温度管理是动力电池系统设计开发的重要研究课题。
为了给动力电池通风散热 ,混合动力汽车上专设有电池风扇及电池进出风 道。 混合动力汽车动力电池表面布有多个数字温度传感器， 釆集多个表面点的 温度来反映动力电池工作温度， 并将温度数据传送给动力电池管理系统。动力 电池管理系统将多个数字温度传感器的温度值进行比较得出最高温度值、最低 温度值、 温差 （最高温度值与最低温度值之差）， 并根据动力电池温度过高控 制方法来判断动力电池温度是否过高及对应的电池风扇开度值 1 ; 根据动力电
扇开度值 3 ; 最终将电池风扇开度值 1、 2、 3进行比较得出电池风扇开度的最 大值， 并用此开度值控制电池风扇开启给电池通风。该方法综合考虑了动力电 池温度过高、 过低及温差过大情况， 可以全面保护动力电池使用性能及寿命。 以下结合附图对动力电池温度管理方法的各个子控制方法进行详细说明。
1、 动力电池温度过高控制方法的流程如图 2所示：
动力电池根据自身的性能都有一定的工作温度范围， 如果电池温度达到或 超过最高工作温度会严重影响电池充放电效率及循环使用寿命。
整车在高温环境下行驶或动力电池持续循环充放电时电池温度会不断上 升， 可能达到或超过最高工作温度，故需要在电池温度达到最高工作温度之前 提前给电池散热， 防止电池温度过高。
动力电池管理系统在电池达到最高工作温度之前根据需要按从低到高设 置了不同的电池温度过高阔值点 N...3、 2、 1 , 即电池温度过高阔值点 1> 电 池温度过高阔值点 2>…： >电池温度过高阔值点 N,并且对应了电池风扇不同的 开度值，在不同的电池温度过高阔值点之间电池风扇开度值线性增加， 其中最 低的温度过高阔值点 N对应电池风扇开始开启， 最高的温度阔值点 1对应电 池风扇全开。
动力电池管理系统根据电池表面多个温度传感器釆集到的温度值比较得 出最高温度值，将此值和电池温度过高阔值点进行比较计算得出电池温度过高 导致要开启的电池风扇开度值， 并将此值传送给电池风扇开度值 1。
具体过程是：
( 1 ) 比较电池最高温度值是否超过设置的电池温度过高阔值点 1 , 如果 是， 则计算对应的电池风扇开度值， 并将此值传送给电池风扇开度值 1 ;
( 2 )如果否， 则比较电池最高温度值是否超过设置的电池温度过高阔值 点 2, 如果是， 则计算对应的电池风扇开度值， 并将此值传送给电池风扇开度 值 1 ;
( 3 ) 比较电池最高温度值是否超过设置的电池温度过高阔值点 N, 如果 是， 则计算对应的电池风扇开度值， 并将此值传送给电池风扇开度值 1 ; 如果 否， 则循环回步骤 ( 1 )。
2、 动力电池温度过低控制方法的流程如图 3所示：
动力电池根据自身的性能都有一定的工作温度范围， 如果电池温度在最低 工作温度之下时会严重影响电池充放电效率及循环使用寿命。
整车在低温环境下行驶时电池温度可能在最低工作温度之下， 此时需要将 电池温度尽快温升达到或超过最低工作温度， 防止电池温度过低。 整车在低温 环境下时驾驶人员都会开启空调暖风行驶，此时动力电池管理系统根据电池表 面多个数字温度传感器釆集到的数字温度值比较得出最高温度值，将此值和电 池最低工作温度值进行比较，如果电池温度值低于电池最低工作温度值， 则控 制电池风扇全开 ,将暖风吹入电池包内加快电池温升直至电池温度达到最低工 作温度， 并将此电池风扇开度值传送给电池风扇开度值 2; 否则不开启电池风 扇。
3、 动力电池温差过大控制方法的流程图如图 4所示：
动力电池根据本身的使用性能只能在一定的温差范围内使用， 电池温差达 到或超过最大温差值会严重影响电池的使用性能及寿命。电池在循环充放电过 程中局部温度不均衡， 可能达到或超过最大温差值，故需要在电池温差达到最 大温差值之前提前给电池通风， 防止电池温差过大。
动力电池管理系统在电池达到最大温差之前根据需要按从小到大设置了 不同的电池温差过大阔值点 N...3、 2、 1 , 即电池温差过大阔值点 1> 电池温 差过大阔值点 2>…： >电池温差过大阔值点 N,并且对应了电池风扇不同的开度 温差过大阔值点 N对应电池风扇开始开启， 最大的温差过大阔值点 1对应电 池风扇全开。动力电池管理系统根据电池表面多个温度传感器釆集到的温度值 比较得出最高温度值， 最低温度值， 计算得出最大温差值， 将此值和电池温差 过大阔值点进行比较计算得出电池温差过大导致要开启的电池风扇开度值，并 将此值传送给电池风扇开度值 3。
具体过程：
( 1 )比较电池最大温差是否超过设置的电池温差过大阔值点 1 , 如果是， 则计算对应的电池风扇开度值， 并将此值传送给电池风扇开度值 3
( 2 )如果否， 则比较电池最大温差是否超过设置的电池温差过大阔值点
2, 如果是， 则计算对应的电池风扇开度值， 并将此值传送给电池风扇开度值
( 3 ) 比较电池最大温差是否超过设置的电池温差过大阔值点 N, 如果是， 则 计算对应的电池风扇开度值， 并将此值传送给电池风扇开度值 3 ; 如果否， 则 循环回步骤（ 1 )

Claims

权 利 要 求
1、 一种动力电池温度管理方法， 所述方法通过适时控制电池风扇开启给 电池通风来有效避免动力电池温度过高、过低及局部温差过大，使电池工作在 最佳工作温度区间； 其特征在于， 包括以下步骤：
( 11)、 由动力电池表面分布的温度传感器釆集多个表面点的温度来反映 动力电池工作温度， 并将所釆集到的温度数据传送给动力电池管理系统；
( 12)、由动力电池管理系统将釆集到的温度值进行比较得出最高温度值、 最低温度值、 电池最大温差即最高温度值与最低温度值之差；
( 13)、 根据动力电池温度过高控制方法判断动力电池温度是否过高， 如 果是， 则计算对应的电池风扇开度值 1; 如果否， 则进入步骤（14);
( 14)、 根据动力电池温度过低控制方法判断动力电池温度是否过低， 如 果是， 则计算对应的电池风扇开度值 2; 如果否， 则进入步骤（15);
( 15)、 根据动力电池温差过大控制方法判断动力电池温差是否过大， 如 果是， 则计算对应的电池风扇开度值 3; 如果否， 则返回步骤（11 );
( 16)、 比较所述电池风扇开度值 1、 所述电池风扇开度值 2、 所述电池风 扇开度值 3, 得出最大值的电池风扇开度， 并用该最大值的电池风扇开度值控 制电池风扇开启给电池通风。
2、 根据权利要求 1所述的动力电池温度管理方法， 其特征在于， 所述电 池温度过高控制方法的步骤如下：
在电池达到最高工作温度之前根据需要按从低到高设置了不同的电池温 度过高阔值点 N...3、 2、 1, 即电池温度过高阔值点 1> 电池温度过高阔值点 2>...>电池温度过高阔值点 N, 并且各电池温度过高阔值点对应不同的电池风 扇开度值， 在不同的电池温度过高阔值点之间电池风扇开度值线性增加， 其中 最低的电池温度过高阔值点 N对应电池风扇开始开启， 最高的电池温度阔值 点 1对应电池风扇全开；
(21 )比较电池最高温度值是否超过设置的电池温度过高阔值点 1, 如果 是， 则计算对应的电池风扇开度值， 并将此值传送给电池风扇开度值 1, 则进 入步骤（ 22 ); ( 22 )比较电池最高温度值是否超过设置的电池温度过高阔值点 2 , 如果 是， 则计算对应的电池风扇开度值， 并将该电池风扇开度值传送给电池风扇开 度值 1 ; 如果否， 则进入步骤（23 );
( 23 )比较电池最高温度值是否超过设置的电池温度过高阔值点 N, N≥3 , 如果是， 则计算对应的电池风扇开度值， 并将该电池风扇开度值传送给电池风 扇开度值 1 ; 如果否， 则循环回步骤（21 )。
3、 根据权利要求 1 所述的动力电池温度管理方法， 其特征在于， 所述电 池温度过低控制方法是： 比较电池最高温度值是否低于电池最低工作温度，如 果是， 则控制电池风扇全开，将暖风吹入电池包内加快电池温升直至电池温度 达到最低工作温度，并将所述电池最高温度值所对应的电池风扇开度值传送给 电池风扇开度值 2; 如果否， 则不开启电池风扇。
4、 根据权利要求 1所述的动力电池温度管理方法， 其特征在于， 所述电 池温差过大控制方法的步骤如下：
动力电池管理系统在电池达到最大温差之前根据需要按从小到大设置不 同的电池温差过大阔值点 N...3、 2、 1 , 即电池温差过大阔值点 1> 电池温差 过大阔值点 2>…： >电池温差过大阔值点 N,并且各电池温差过大阔值点对应不 增加， 其中最小的电池温差过大阔值点 N对应电池风扇开始开启， 最大的电 池温差过大阔值点 1对应电池风扇全开；
( 41 )比较电池最大温差是否超过设置的电池温差过大阔值点 1 ,如果是， 则计算对应的电池风扇开度值 ,并将该电池风扇开度值传送给电池风扇开度值
3; 如果否， 则进入步骤（42 );
( 42 )比较电池最大温差是否超过设置的电池温差过大阔值点 2 ,如果是， 则计算对应的电池风扇开度值 ,并将该电池风扇开度值传送给电池风扇开度值
3; 如果否， 则进入步骤（43 )；
( 43 ) 比较电池最大温差是否超过设置的电池温差过大阔值点 N, N>3 , 如果是， 则计算对应的电池风扇开度值， 并将该电池风扇开度值传送给电池风 扇开度值 3; 如果否， 则循环回步骤（41)。
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