WO2011076096A1 - Vehicular lithium battery charger and control method thereof - Google Patents

Vehicular lithium battery charger and control method thereof Download PDF

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Publication number
WO2011076096A1
WO2011076096A1 PCT/CN2010/079999 CN2010079999W WO2011076096A1 WO 2011076096 A1 WO2011076096 A1 WO 2011076096A1 CN 2010079999 W CN2010079999 W CN 2010079999W WO 2011076096 A1 WO2011076096 A1 WO 2011076096A1
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Prior art keywords
charging
module
voltage
battery pack
rechargeable battery
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PCT/CN2010/079999
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French (fr)
Chinese (zh)
Inventor
龚立秋
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奇瑞汽车股份有限公司
芜湖普威技研有限公司
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Publication of WO2011076096A1 publication Critical patent/WO2011076096A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/0071—Regulation of charging or discharging current or voltage with a programmable schedule

Definitions

  • the invention belongs to the technical field of automobile electronics, and particularly relates to a charger for a vehicle lithium battery of an automobile and a charging control method thereof. Background technique
  • the current in-vehicle charger is generally disclosed in the Chinese Patent Application No. 200720171927.7, entitled "Battery Pack Charging Device", including a detecting unit, a comparing unit, a charging unit, and a comparing unit for setting a first voltage value and a And a second voltage value, when the detected voltage value is less than the first voltage value, performing trickle charging, and when the detected voltage value is greater than or equal to the first voltage value and less than the second voltage value, performing constant current charging, when the detecting voltage value is greater than or equal to the second voltage Constant voltage charging is performed for the value.
  • the technical problem to be solved by the present invention is to provide a vehicle lithium battery charger and a charging control method thereof, which can better control the charging process and maximize the charging current and voltage to the battery optimally.
  • a charging lithium battery charger that extends the battery life to extend battery life.
  • the present invention provides a vehicle lithium battery charger including a filter module, a power factor correction module, a DC-DC power conversion module, a control module, an auxiliary power supply, an output protection module, and a temperature detection module.
  • the filtering module has an input end for connecting to the mains, and the output end of the filtering module is respectively connected to the input end of the power factor correction module and the auxiliary power source, wherein the auxiliary power source is a control module and the heat dissipation
  • the fan power supply, the power factor correction module, the DC-DC power conversion module, and the output protection module are sequentially connected in series, and the output protection module has an output end connected to the battery charging terminal;
  • the control module is respectively coupled with the cooling fan and the power
  • the factor correction module, the output protection module, the temperature detection module, the display module, and the DC-DC power conversion module are connected to control the operation thereof, and the control module is also connected to the battery management system on the vehicle through the CAN bus.
  • the invention also provides a charging control method for a vehicle lithium battery charger.
  • the charging control method is as follows: The optimal charging curve of one or more battery packs is preset in the control module, and the control is performed.
  • the module selects the corresponding optimal charging curve according to the battery pack information sent by the battery management system, and controls the output voltage and output of the DC-DC power conversion module according to the optimal charging curve and the voltage of the rechargeable battery sent by the battery management system.
  • Current, the optimal charging curve is a curve describing the optimal relationship between the charging voltage of the battery pack and the charging current.
  • the optimal charging curve of one or more battery packs is pre-configured in the control module.
  • the optimal charging curve can be selected according to the type and quantity of the battery pack actually installed in the vehicle to better control the charging process.
  • the control module controls the DC-DC power conversion module to trickle charge the battery pack; when the charging voltage is at the first predetermined value U1 and the second predetermined value U2 Between the time, the control module controls the output current of the DC-DC power conversion module according to the voltage of the rechargeable battery pack and the optimal charging curve, the first predetermined value U1 being less than the second predetermined value U2; when the voltage of the rechargeable battery pack is greater than When the second predetermined value U2, the control module controls the DC-DC power conversion module to perform constant voltage charging on the battery pack, until the charging current is less than the preset value II, the control module turns off the power factor correction module and the DC-DC power conversion module, and ends. Charging.
  • the control module collects the charging voltage of the battery pack and the output current of the DC-DC power conversion module in real time, and controls The output current of the DC-DC power conversion module allows the charging power of the battery pack to be close to the charging rated power of the battery pack.
  • the control module detects the charging voltage, charging current and temperature of the battery pack in real time. When overvoltage, undervoltage, overcurrent and overtemperature faults occur, the control module turns off the power factor correction module and the DC-DC power conversion module. , Stop charging to protect the charger and rechargeable battery.
  • control module sends the detected battery pack charging voltage, charging current, and calculated battery pack SOC and charger status to the display module for real-time observation and understanding of the charging process.
  • control module sends the detected battery pack charging voltage, charging current and charger status to the battery management system in real time, so that the battery management system can control the battery pack for balanced charging and related protection of the battery pack.
  • control module collects the temperature of the charger through the temperature detection module.
  • the cooling fan is activated to dissipate heat to avoid damage to the charger.
  • the vehicle lithium battery charger and the charging control method thereof can automatically charge and maintain the lithium battery pack of the vehicle, and can control the charging process, so that the charging current and the voltage are optimally close to the optimal charging curve of the battery, and the charging speed is improved. At the same time, it extends the life of the battery.
  • FIG. 1 is a schematic diagram of the principle of a vehicle-mounted lithium battery charger of the present invention
  • FIG. 2 is a schematic diagram of a charging control flow of a vehicle-mounted lithium battery charger of the present invention. detailed description
  • the vehicle lithium battery charger of the present invention comprises a filtering module 1 , a power factor correction module 2 , a DC-DC power conversion module 3 , a control module 4 , an auxiliary power supply 5 , an output protection module 6 , and a temperature detection module. 7.
  • the cooling fan 8 and the display module 9; the filtering module 1 is connected to the mains, and the output end of the filtering module 1 is respectively connected to the input end of the power factor correction module 2 and the auxiliary power source 5, and the auxiliary power source 5 is directed to the control module 4 and the cooling fan 8 is powered, the power factor correction module 2, the DC-DC power conversion module 3, and the output protection module 6 are connected in series, and the output protection module 6 is connected to the rechargeable battery pack 11; the control module 4 respectively
  • the cooling fan 8, the power factor correction module 2, the output protection module 6, the temperature detection module 7, the display module 9, the DC-DC power conversion module 3 are connected and control the operation of the modules, wherein the control module 4 detects the DC-DC power respectively.
  • the current, output voltage, and control module 4 are also coupled to the battery management system 10 on the vehicle via a CAN bus.
  • a second object of the present invention is to provide a charging control method for the above-described vehicle lithium battery charger.
  • the charging control method is as follows: the optimal charging curve of one or more rechargeable battery packs 11 is preset in the control module 4, and the control module 4 selects the corresponding optimal charging curve according to the information of the rechargeable battery pack 11 sent by the battery management system 10. And controlling the output voltage and the output current of the DC-DC power conversion module 3 according to the optimal charging curve and the voltage of the rechargeable battery sent by the battery management system 10, wherein the optimal charging curve is to describe the charging voltage and charging of the rechargeable battery pack 11. The curve of the optimal relationship of current.
  • step S100 the system is initialized.
  • step S101 the voltage U of the rechargeable battery pack 11 is determined.
  • the control module 4 controls the DC-DC power conversion module 3 to trickle charge the battery pack 11 as steps S103: a first second predetermined value when the detected voltage value is greater than or equal to the first voltage value and less than the second voltage value
  • the first predetermined value U1 is smaller than the second predetermined value U2, and then proceeds to step S102, that is, the control module 4 controls the output current of the DC-DC power conversion module according to the voltage of the rechargeable battery pack 11 and the optimal charging curve, the first and second.
  • step S102 charging the rechargeable battery pack 11 according to the optimal charging curve in step S102 (constant voltage charging); after trickling charging for a period of time in step S103, re-determining whether the voltage U of the rechargeable battery pack 11 is less than the first predetermined value U1 If the voltage U of the rechargeable battery pack 11 is still less than the first predetermined value U1, the process returns to step S103 to trickle charge the rechargeable battery pack 11; if the voltage U of the rechargeable battery pack 11 is not less than the first predetermined
  • the value U1 proceeds to step S105, and it is determined in step S105 whether the voltage U of the rechargeable battery pack 11 is less than the second predetermined value U2; when the charging voltage U is less than the second predetermined value U2, the process returns to step S102; when the voltage of the battery pack 11 is charged When U is greater than or equal to the second predetermined value U2, the control module 4 controls the DC-DC power conversion module 3 to perform constant voltage charging on the rechargeable battery pack 11, as shown in step S106; charging electricity during constant voltage charging
  • the control module 4 collects the charging voltage of the battery pack and the output current of the DC-DC power conversion module 3 in real time, and controls the output current of the DC-DC power conversion module 3 to make the rechargeable battery pack 11
  • the charging power is close to the charging rated power of the rechargeable battery pack 11.
  • the control module 4 detects the charging voltage, the charging current and the temperature of the rechargeable battery pack 11 in real time. When an overvoltage, undervoltage, overcurrent and overtemperature fault occurs, the control module 4 turns off the power factor correction module 2 and the DC. -DC power conversion module 3, stop charging to protect the charger and rechargeable battery.
  • control module 4 sends the detected charging battery pack 11 charging voltage, charging current, and calculated battery pack SOC and charger status to the display module 9 for real-time observation and understanding of the charging process.
  • control module 4 sends the detected charging battery pack 11 charging voltage, charging current and charger status to the battery management system 10 in real time, so that the battery management system 10 controls the rechargeable battery pack 11 to perform equalization charging and achieves the pair.
  • the control module 4 collects the temperature of the charger through the temperature detecting module 7. When the temperature is too high, the cooling fan is activated to perform heat dissipation in 8 rows to avoid damage to the charger.

Abstract

A vehicular lithium battery charger and control method thereof. When the voltage of a charge battery pack (11) is lower than a first predetermined value, trickle charge is performed; when the voltage of the charge battery pack (11) is between the first predetermined value and a second predetermined value, a control module (4) in the charger controls the output current of a DC-DC power conversion module (3) according to the voltage of the charge battery pack (11) and an optimum charge curve; when the voltage of the charge battery pack (11) is higher than the second predetermined value, constant voltage charge is performed. The charger and control method thereof can make the charge current and charge voltage approach the optimum charge curve to the utmost extent, so as to prolong the service life of the battery.

Description

车载锂电池充电器及其充电控制方法 技术领域  Vehicle lithium battery charger and charging control method thereof
本发明属于汽车电子技术领域， 特别涉及到汽车的车载锂电池的充电器及其充电 控制方法。 背景技术  The invention belongs to the technical field of automobile electronics, and particularly relates to a charger for a vehicle lithium battery of an automobile and a charging control method thereof. Background technique
目前的车载充电器一般都如申请号为 200720171927.7、名称为 "电池组充电装置" 的中国专利申请中所公开的那样， 包括检测单元、 比较单元、 充电单元， 比较单元设 置第一电压值和第二电压值， 当检测电压值小于第一电压值时进行涓流充电， 当检测 电压值大于等于第一电压值且小于第二电压值时进行恒流充电， 当检测电压值大于等 于第二电压值时进行恒压充电。  The current in-vehicle charger is generally disclosed in the Chinese Patent Application No. 200720171927.7, entitled "Battery Pack Charging Device", including a detecting unit, a comparing unit, a charging unit, and a comparing unit for setting a first voltage value and a And a second voltage value, when the detected voltage value is less than the first voltage value, performing trickle charging, and when the detected voltage value is greater than or equal to the first voltage value and less than the second voltage value, performing constant current charging, when the detecting voltage value is greater than or equal to the second voltage Constant voltage charging is performed for the value.
上述充电器的缺点是充电速度慢， 并且因为在恒流充电过程中其充电电流是一个 固定值， 不能很好的跟踪最佳充电曲线， 会影响电池的使用寿命。 发明内容  The disadvantage of the above charger is that the charging speed is slow, and since the charging current is a fixed value during constant current charging, the optimal charging curve cannot be well tracked, which may affect the battery life. Summary of the invention
本发明所要解决的技术问题在于， 针对现有技术的不足提供一种车载锂电池充电 器及其充电控制方法， 能够更好地控制充电过程， 使充电电流、 电压最大程度地接近 电池的最佳充电曲线， 从而延长电池使用寿命的车载锂电池充电器。  The technical problem to be solved by the present invention is to provide a vehicle lithium battery charger and a charging control method thereof, which can better control the charging process and maximize the charging current and voltage to the battery optimally. A charging lithium battery charger that extends the battery life to extend battery life.
为了解决的上述的技术问题， 本发明提供了一种车载锂电池充电器， 包括有滤波 模块、 功率因数校正模块、 DC-DC功率变换模块、 控制模块、 辅助电源、 输出保护模 块、 温度检测模块、 散热风扇和显示模块； 所述滤波模块具有用于接入市电的输入端， 滤波模块的输出端分别接至功率因数校正模块和辅助电源的输入端， 所述辅助电源为 控制模块和散热风扇供电， 所述功率因数校正模块、 DC-DC功率变换模块、 输出保护 模块依次串联， 所述输出保护模块具有用于与电池充电端子相连的输出端； 所述控制 模块分别与散热风扇、 功率因数校正模块、 输出保护模块、 温度检测模块、 显示模块、 DC-DC功率变换模块相连以控制其工作， 控制模块还通过 CAN总线与车上的电池管 理系统相连。  In order to solve the above technical problem, the present invention provides a vehicle lithium battery charger including a filter module, a power factor correction module, a DC-DC power conversion module, a control module, an auxiliary power supply, an output protection module, and a temperature detection module. And a cooling module and a display module; the filtering module has an input end for connecting to the mains, and the output end of the filtering module is respectively connected to the input end of the power factor correction module and the auxiliary power source, wherein the auxiliary power source is a control module and the heat dissipation The fan power supply, the power factor correction module, the DC-DC power conversion module, and the output protection module are sequentially connected in series, and the output protection module has an output end connected to the battery charging terminal; the control module is respectively coupled with the cooling fan and the power The factor correction module, the output protection module, the temperature detection module, the display module, and the DC-DC power conversion module are connected to control the operation thereof, and the control module is also connected to the battery management system on the vehicle through the CAN bus.
本发明还提供了一种车载锂电池充电器的充电控制方法。  The invention also provides a charging control method for a vehicle lithium battery charger.
充电控制方法如下： 控制模块内预设有一条或者多条电池包的最佳充电曲线， 控 制模块根据电池管理系统发送的电池包信息来选择相应的最佳充电曲线， 并根据该最 佳充电曲线及电池管理系统发送的充电电池的电压来控制 DC-DC 功率变换模块的输 出电压和输出电流， 所述最佳充电曲线为描述电池包充电电压和充电电流的最佳关系 的曲线。 The charging control method is as follows: The optimal charging curve of one or more battery packs is preset in the control module, and the control is performed. The module selects the corresponding optimal charging curve according to the battery pack information sent by the battery management system, and controls the output voltage and output of the DC-DC power conversion module according to the optimal charging curve and the voltage of the rechargeable battery sent by the battery management system. Current, the optimal charging curve is a curve describing the optimal relationship between the charging voltage of the battery pack and the charging current.
控制模块内预设有一条或者多条电池包的最佳充电曲线， 可以根据汽车实际所装 配的电池包型号、 数量等信息来选择相应的最佳充电曲线， 以更好地控制充电过程。  The optimal charging curve of one or more battery packs is pre-configured in the control module. The optimal charging curve can be selected according to the type and quantity of the battery pack actually installed in the vehicle to better control the charging process.
具体来说， 当充电电池包的电压小于第一预定值 U1时， 控制模块控制 DC-DC功 率变换模块对电池包进行涓流充电； 当充电电压处于第一预定值 U1和第二预定值 U2 之间时，控制模块根据充电电池包的电压和最佳充电曲线来控制 DC-DC功率变换模块 的输出电流， 所述第一预定值 U1小于第二预定值 U2; 当充电电池包的电压大于第二 预定值 U2时， 控制模块控制 DC-DC功率变换模块对电池包进行恒压充电， 直到充电 电流小于预设值 II时， 控制模块关闭功率因数校正模块和 DC-DC功率变换模块， 结 束充电。  Specifically, when the voltage of the rechargeable battery pack is less than the first predetermined value U1, the control module controls the DC-DC power conversion module to trickle charge the battery pack; when the charging voltage is at the first predetermined value U1 and the second predetermined value U2 Between the time, the control module controls the output current of the DC-DC power conversion module according to the voltage of the rechargeable battery pack and the optimal charging curve, the first predetermined value U1 being less than the second predetermined value U2; when the voltage of the rechargeable battery pack is greater than When the second predetermined value U2, the control module controls the DC-DC power conversion module to perform constant voltage charging on the battery pack, until the charging current is less than the preset value II, the control module turns off the power factor correction module and the DC-DC power conversion module, and ends. Charging.
为加快充电过程， 縮短充电时间， 当充电电压处于第一预定值 U1 和第二预定值 U2之间时，控制模块实时采集电池包的充电电压和 DC-DC功率变换模块的输出电流， 并控制 DC-DC 功率变换模块的输出电流使电池包的充电功率接近电池包的充电额定 功率。  In order to speed up the charging process and shorten the charging time, when the charging voltage is between the first predetermined value U1 and the second predetermined value U2, the control module collects the charging voltage of the battery pack and the output current of the DC-DC power conversion module in real time, and controls The output current of the DC-DC power conversion module allows the charging power of the battery pack to be close to the charging rated power of the battery pack.
在充电过程中， 控制模块实时检测电池包的充电电压、 充电电流及温度， 当发生 过压、欠压、 过流及过温故障时， 控制模块关闭功率因数校正模块和 DC-DC功率变换 模块， 停止充电， 以对充电器及充电电池进行保护。  During the charging process, the control module detects the charging voltage, charging current and temperature of the battery pack in real time. When overvoltage, undervoltage, overcurrent and overtemperature faults occur, the control module turns off the power factor correction module and the DC-DC power conversion module. , Stop charging to protect the charger and rechargeable battery.
在充电过程中， 控制模块实时将检测到的电池包充电电压、 充电电流及计算得出 的电池包 SOC和充电器状态发送至显示模块显示， 方便人们观察和了解充电过程。  During the charging process, the control module sends the detected battery pack charging voltage, charging current, and calculated battery pack SOC and charger status to the display module for real-time observation and understanding of the charging process.
在充电过程中， 控制模块实时将检测到的电池包充电电压、 充电电流和充电器状 态发送至电池管理系统， 以利于电池管理系统控制电池包进行均衡充电及实现对电池 包的相关保护。  During the charging process, the control module sends the detected battery pack charging voltage, charging current and charger status to the battery management system in real time, so that the battery management system can control the battery pack for balanced charging and related protection of the battery pack.
在充电过程中， 控制模块通过温度检测模块采集充电器的温度， 当温度过高时就 启动散热风扇进行散热， 避免损坏充电器。  During the charging process, the control module collects the temperature of the charger through the temperature detection module. When the temperature is too high, the cooling fan is activated to dissipate heat to avoid damage to the charger.
本发明的车载锂电池充电器及其充电控制方法可以为车载锂电池包自动充电和维 护， 并能够控制充电过程， 使充电电流、 电压最大程度地接近电池的最佳充电曲线， 在提高充电速度的同时延长了电池的使用寿命。 附图说明 The vehicle lithium battery charger and the charging control method thereof can automatically charge and maintain the lithium battery pack of the vehicle, and can control the charging process, so that the charging current and the voltage are optimally close to the optimal charging curve of the battery, and the charging speed is improved. At the same time, it extends the life of the battery. DRAWINGS
图 1是本发明的车载锂电池充电器的原理示意图；  1 is a schematic diagram of the principle of a vehicle-mounted lithium battery charger of the present invention;
图 2是本发明的车载锂电池充电器的充电控制流程示意图。 具体实施方式  2 is a schematic diagram of a charging control flow of a vehicle-mounted lithium battery charger of the present invention. detailed description
下面结合具体实施例和附图来详细说明本发明。  The invention will be described in detail below with reference to specific embodiments and drawings.
实施例 1 :  Example 1
如图 1所示，本发明的车载锂电池充电器包括有滤波模块 1、功率因数校正模块 2、 DC-DC功率变换模块 3、 控制模块 4、 辅助电源 5、 输出保护模块 6、 温度检测模块 7、 散热风扇 8和显示模块 9; 所述滤波模块 1接入市电， 滤波模块 1的输出端分别接至 功率因数校正模块 2和辅助电源 5的输入端， 所述辅助电源 5向控制模块 4和散热风 扇 8供电， 所述功率因数校正模块 2、 DC-DC功率变换模块 3、 输出保护模块 6依次 串联，所述输出保护模块 6与充电电池包 11相连；所述控制模块 4分别与散热风扇 8、 功率因数校正模块 2、 输出保护模块 6、 温度检测模块 7、 显示模块 9、 DC-DC功率变 换模块 3相连并控制所述这些模块工作，其中控制模块 4分别检测 DC-DC功率变换模 块 3的输出电流、 输出电压， 并通过双路 DA数模转换模块 12来设置 DC-DC功率变 换模块 3的输出电流、输出电压，控制模块 4还通过 CAN总线与车上的电池管理系统 10相连。  As shown in FIG. 1 , the vehicle lithium battery charger of the present invention comprises a filtering module 1 , a power factor correction module 2 , a DC-DC power conversion module 3 , a control module 4 , an auxiliary power supply 5 , an output protection module 6 , and a temperature detection module. 7. The cooling fan 8 and the display module 9; the filtering module 1 is connected to the mains, and the output end of the filtering module 1 is respectively connected to the input end of the power factor correction module 2 and the auxiliary power source 5, and the auxiliary power source 5 is directed to the control module 4 and the cooling fan 8 is powered, the power factor correction module 2, the DC-DC power conversion module 3, and the output protection module 6 are connected in series, and the output protection module 6 is connected to the rechargeable battery pack 11; the control module 4 respectively The cooling fan 8, the power factor correction module 2, the output protection module 6, the temperature detection module 7, the display module 9, the DC-DC power conversion module 3 are connected and control the operation of the modules, wherein the control module 4 detects the DC-DC power respectively. Transforming the output current and output voltage of the module 3, and setting the output of the DC-DC power conversion module 3 through the dual DA digital-to-analog conversion module 12. The current, output voltage, and control module 4 are also coupled to the battery management system 10 on the vehicle via a CAN bus.
本发明的第二个目的是提出上述的车载锂电池充电器的充电控制方法。  A second object of the present invention is to provide a charging control method for the above-described vehicle lithium battery charger.
充电控制方法如下：控制模块 4内预设有一条或者多条充电电池包 11的最佳充电 曲线， 控制模块 4根据电池管理系统 10发送的充电电池包 11信息来选择相应的最佳 充电曲线， 并根据该最佳充电曲线及电池管理系统 10 发送的充电电池的电压来控制 DC-DC功率变换模块 3的输出电压和输出电流，所述最佳充电曲线为描述充电电池包 11充电电压和充电电流的最佳关系的曲线。  The charging control method is as follows: the optimal charging curve of one or more rechargeable battery packs 11 is preset in the control module 4, and the control module 4 selects the corresponding optimal charging curve according to the information of the rechargeable battery pack 11 sent by the battery management system 10. And controlling the output voltage and the output current of the DC-DC power conversion module 3 according to the optimal charging curve and the voltage of the rechargeable battery sent by the battery management system 10, wherein the optimal charging curve is to describe the charging voltage and charging of the rechargeable battery pack 11. The curve of the optimal relationship of current.
图 2是本发明的车载锂电池充电器的充电控制流程示意图， 如图 2并参照图 1所 示， 首先， 在步骤 S100, 系统初始化； 然后， 在步骤 S101 , 判断充电电池包 11的电 压 U是否小于第一预定值 Ul， 当充电电池组电池包 11的电压 U小于第一预定值 U1 时， 控制模块 4控制 DC-DC功率变换模块 3对电池组电池包 11进行涓流充电， 如步 骤 S103; 当检测电压值大于等于第一电压值且小于第二电压值时第一第二预定值， 所 述第一预定值 Ul小于第二预定值 U2， 则进入步骤 S102, 即控制模块 4根据充电电池 包 11的电压和最佳充电曲线来控制 DC-DC功率变换模块的输出电流， 第一第二预定 值； 在步骤 S102按照最佳充电曲线为充电电池包 11充电 （恒压充电）； 在步骤 S103 中涓流充电一段时间后， 重新判断充电电池包 11的电压 U是否小于第一预定值 Ul， 如步骤 S104所示； 如果充电电池包 11 的电压 U仍小于第一预定值 U1 则返回步骤 S103, 对充电电池包 11进行涓流充电； 如果充电电池包 11的电压 U不小于第一预定 值 U1则进入步骤 S105, 在步骤 S105判断充电电池包 11的电压 U是否小于第二预定 值 U2; 当充电电压 U小于第二预定值 U2时， 则返回步骤 S102; 当充电电池包 11的 电压 U大于等于第二预定值 U2时，控制模块 4控制 DC-DC功率变换模块 3对充电电 池包 11进行恒压充电， 如步骤 S106所示； 由于恒压充电过程中充电电流不断减小， 所以判断充电电流 I是否大于预定值 II， 如步骤 S107所示； 当充电电流 I大于预设值 II是， 则返回步骤 S106对充电电池包 11进行恒压充电； 当充电电流 I小于预设值 II 时表明充电电池包 11已充满， 控制模块 4关闭功率因数校正模块 2和 DC-DC功率变 换模块 3， 结束充电。 2 is a schematic diagram of a charging control flow of the on-board lithium battery charger of the present invention. As shown in FIG. 2 and referring to FIG. 1, first, in step S100, the system is initialized. Then, in step S101, the voltage U of the rechargeable battery pack 11 is determined. Whether it is less than the first predetermined value U1, when the voltage U of the rechargeable battery pack 11 is less than the first predetermined value U1, the control module 4 controls the DC-DC power conversion module 3 to trickle charge the battery pack 11 as steps S103: a first second predetermined value when the detected voltage value is greater than or equal to the first voltage value and less than the second voltage value The first predetermined value U1 is smaller than the second predetermined value U2, and then proceeds to step S102, that is, the control module 4 controls the output current of the DC-DC power conversion module according to the voltage of the rechargeable battery pack 11 and the optimal charging curve, the first and second. a predetermined value; charging the rechargeable battery pack 11 according to the optimal charging curve in step S102 (constant voltage charging); after trickling charging for a period of time in step S103, re-determining whether the voltage U of the rechargeable battery pack 11 is less than the first predetermined value U1 If the voltage U of the rechargeable battery pack 11 is still less than the first predetermined value U1, the process returns to step S103 to trickle charge the rechargeable battery pack 11; if the voltage U of the rechargeable battery pack 11 is not less than the first predetermined The value U1 proceeds to step S105, and it is determined in step S105 whether the voltage U of the rechargeable battery pack 11 is less than the second predetermined value U2; when the charging voltage U is less than the second predetermined value U2, the process returns to step S102; when the voltage of the battery pack 11 is charged When U is greater than or equal to the second predetermined value U2, the control module 4 controls the DC-DC power conversion module 3 to perform constant voltage charging on the rechargeable battery pack 11, as shown in step S106; charging electricity during constant voltage charging If the charging current I is greater than the predetermined value II, as shown in step S107; when the charging current I is greater than the preset value II, return to step S106 to perform constant voltage charging on the rechargeable battery pack 11; When it is less than the preset value II, it indicates that the rechargeable battery pack 11 is full, and the control module 4 turns off the power factor correction module 2 and the DC-DC power conversion module 3 to end the charging.
请再次参考图 1， 为加快充电过程， 縮短充电时间， 当充电电压处于第一预定值 Please refer to Figure 1 again to speed up the charging process and shorten the charging time when the charging voltage is at the first predetermined value.
U1和第二预定值 U2之间时， 控制模块 4实时采集电池包的充电电压和 DC-DC功率 变换模块 3的输出电流， 并控制 DC-DC功率变换模块 3的输出电流使充电电池包 11 的充电功率接近充电电池包 11的充电额定功率。 When U1 is between the second predetermined value U2, the control module 4 collects the charging voltage of the battery pack and the output current of the DC-DC power conversion module 3 in real time, and controls the output current of the DC-DC power conversion module 3 to make the rechargeable battery pack 11 The charging power is close to the charging rated power of the rechargeable battery pack 11.
在充电过程中，控制模块 4实时检测充电电池包 11的充电电压、充电电流及温度， 当发生过压、欠压、过流及过温故障时，控制模块 4关闭功率因数校正模块 2和 DC-DC 功率变换模块 3， 停止充电， 以对充电器及充电电池进行保护。  During the charging process, the control module 4 detects the charging voltage, the charging current and the temperature of the rechargeable battery pack 11 in real time. When an overvoltage, undervoltage, overcurrent and overtemperature fault occurs, the control module 4 turns off the power factor correction module 2 and the DC. -DC power conversion module 3, stop charging to protect the charger and rechargeable battery.
在充电过程中， 控制模块 4实时将检测到的充电电池包 11充电电压、充电电流及 计算得出的电池包 SOC和充电器状态发送至显示模块 9显示，方便人们观察和了解充 电过程。  During the charging process, the control module 4 sends the detected charging battery pack 11 charging voltage, charging current, and calculated battery pack SOC and charger status to the display module 9 for real-time observation and understanding of the charging process.
在充电过程中， 控制模块 4实时将检测到的充电电池包 11充电电压、充电电流和 充电器状态发送至电池管理系统 10， 以利于电池管理系统 10控制充电电池包 11进行 均衡充电及实现对充电电池包 11的相关保护。  During the charging process, the control module 4 sends the detected charging battery pack 11 charging voltage, charging current and charger status to the battery management system 10 in real time, so that the battery management system 10 controls the rechargeable battery pack 11 to perform equalization charging and achieves the pair. Related protection of rechargeable battery pack 11.
在充电过程中， 控制模块 4通过温度检测模块 7采集充电器的温度， 当温度过高 时就启动散热风扇进 8行散热， 避免损坏充电器。 最后所应说明的是： 以上实施例仅用以说明本发明而非限制， 尽管参照较佳实施 例对本发明进行了详细说明， 本领域的普通技术人员应当理解， 可以对本发明进行修 改或者等同替换， 而不脱离本发明的精神和范围， 其均应涵盖在本发明的权利要求范 围当中。 During the charging process, the control module 4 collects the temperature of the charger through the temperature detecting module 7. When the temperature is too high, the cooling fan is activated to perform heat dissipation in 8 rows to avoid damage to the charger. It should be noted that the above embodiments are only intended to illustrate the invention and are not to be construed as limiting the scope of the invention. The spirit and scope of the invention are intended to be included within the scope of the appended claims.

Claims

权利要求书 Claim
1、 一种车载锂电池充电器， 其特征在于， 包括有滤波模块、 功率因数校正模块、 DC-DC功率变换模块、 控制模块、 辅助电源、 输出保护模块、 温度检测模块、 散热风 扇和显示模块； 所述滤波模块具有用于接入市电的输入端， 滤波模块的输出端分别接 至功率因数校正模块和辅助电源的输入端，所述辅助电源为控制模块和散热风扇供电， 所述功率因数校正模块、 DC-DC功率变换模块、 输出保护模块依次串联， 所述输出保 护模块具有用于与电池充电端子相连的输出端； 所述控制模块分别与散热风扇、 功率 因数校正模块、 输出保护模块、 温度检测模块、 显示模块、 DC-DC功率变换模块相连 以控制其工作， 控制模块还通过 CAN总线与车上的电池管理系统相连。  1. A vehicle lithium battery charger, comprising: a filter module, a power factor correction module, a DC-DC power conversion module, a control module, an auxiliary power supply, an output protection module, a temperature detection module, a cooling fan and a display module The filtering module has an input end for accessing the mains, and the output end of the filtering module is respectively connected to the input end of the power factor correction module and the auxiliary power source, wherein the auxiliary power source supplies power to the control module and the cooling fan, and the power is The factor correction module, the DC-DC power conversion module, and the output protection module are sequentially connected in series, and the output protection module has an output end connected to the battery charging terminal; the control module is respectively coupled with a cooling fan, a power factor correction module, and an output protection The module, the temperature detection module, the display module, and the DC-DC power conversion module are connected to control its operation, and the control module is also connected to the battery management system on the vehicle through the CAN bus.
2、 一种权利要求 1中所述的车载锂电池充电器的充电控制方法， 其特征在于， 控 制模块内预设有一条或者多条充电电池包的最佳充电曲线， 控制模块根据电池管理系 统发送的充电电池包信息来选择相应的最佳充电曲线， 并根据该最佳充电曲线及电池 管理系统发送的充电电池的电压来控制 DC-DC功率变换模块的输出电压和输出电流， 所述最佳充电曲线为描述充电电池包充电电压和充电电流的最佳关系的曲线。 2. A charging control method for a vehicle-mounted lithium battery charger according to claim 1, wherein the control module is provided with an optimal charging curve of one or more rechargeable battery packs, and the control module is based on the battery management system. Sending the rechargeable battery pack information to select a corresponding optimal charging curve, and controlling the output voltage and the output current of the DC-DC power conversion module according to the optimal charging curve and the voltage of the rechargeable battery sent by the battery management system, The good charging curve is a curve describing the optimum relationship between the charging voltage and the charging current of the rechargeable battery pack.
3、 根据权利要求 2所述的车载锂电池充电器的充电控制方法， 其特征在于， 当充 电电池包的电压小于第一预定值 U1时， 控制模块控制 DC-DC功率变换模块对充电电 池包进行涓流充电； 当充电电压处于第一预定值 U1和第二预定值 U2之间时， 控制模 块根据充电电池包的电压和最佳充电曲线来控制 DC-DC功率变换模块的输出电流，所 述第一预定值 U1小于第二预定值 U2; 当充电电池包的电压大于第二预定值 U2时， 控制模块控制 DC-DC功率变换模块对充电电池包进行恒压充电，直到充电电流小于预 设值 II时， 控制模块关闭功率因数校正模块和 DC-DC功率变换模块， 结束充电。 3. The charging control method for a vehicle-mounted lithium battery charger according to claim 2, wherein when the voltage of the rechargeable battery pack is less than the first predetermined value U1, the control module controls the DC-DC power conversion module to charge the battery pack Performing trickle charging; when the charging voltage is between the first predetermined value U1 and the second predetermined value U2, the control module controls the output current of the DC-DC power conversion module according to the voltage of the rechargeable battery pack and the optimal charging curve. The first predetermined value U1 is smaller than the second predetermined value U2; when the voltage of the rechargeable battery pack is greater than the second predetermined value U2, the control module controls the DC-DC power conversion module to perform constant voltage charging on the rechargeable battery pack until the charging current is less than the pre-charge When the value II is set, the control module turns off the power factor correction module and the DC-DC power conversion module to end the charging.
4、 根据权利要求 3所述的车载锂电池充电器的充电控制方法， 其特征在于， 当充 电电压处于第一预定值 U1和第二预定值 U2之间时，控制模块实时采集充电电池包的 充电电压和 DC-DC功率变换模块的输出电流， 并控制 DC-DC功率变换模块的输出电 流使充电电池包的充电功率接近充电电池包的充电额定功率。 4. The charging control method for a vehicle-mounted lithium battery charger according to claim 3, wherein when the charging voltage is between the first predetermined value U1 and the second predetermined value U2, the control module collects the rechargeable battery pack in real time. The charging voltage and the output current of the DC-DC power conversion module, and controlling the output current of the DC-DC power conversion module, make the charging power of the rechargeable battery pack close to the charging rated power of the rechargeable battery pack.
5、 根据权利要求 4所述的车载锂电池充电器的充电控制方法， 其特征在于， 在充 电过程中， 控制模块实时检测充电电池包的充电电压、 充电电流及温度， 当发生过压、 欠压、 过流及过温故障时， 控制模块关闭功率因数校正模块和 DC-DC功率变换模块， 停止充电。 5. The charging control method for a vehicle-mounted lithium battery charger according to claim 4, wherein During the electrical process, the control module detects the charging voltage, charging current and temperature of the rechargeable battery pack in real time. When overvoltage, undervoltage, overcurrent and overtemperature faults occur, the control module turns off the power factor correction module and the DC-DC power conversion module. , stop charging.
6、 根据权利要求 5所述的车载锂电池充电器的充电控制方法， 其特征在于， 在充 电过程中， 控制模块实时将检测到的充电电池包充电电压、 充电电流及计算得出的充 电电池包 SOC和充电器状态发送至显示模块显示。 6. The charging control method for a vehicle-mounted lithium battery charger according to claim 5, wherein during the charging process, the control module detects the charged charging voltage of the rechargeable battery pack, the charging current, and the calculated rechargeable battery in real time. The package SOC and charger status are sent to the display module display.
7、 根据权利要求 6所述的车载锂电池充电器的充电控制方法， 其特征在于， 在充 电过程中， 控制模块实时将检测到的充电电池包充电电压、 充电电流和充电器状态发 送至电池管理系统。 7. The charging control method for a vehicle-mounted lithium battery charger according to claim 6, wherein the control module transmits the detected charging battery pack charging voltage, charging current, and charger status to the battery in real time during charging. Management system.
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