CN114872529A - 一种电池包高低温控制系统 - Google Patents
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- 238000001816 cooling Methods 0.000 claims abstract description 21
- 238000004378 air conditioning Methods 0.000 claims description 9
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical group [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 8
- 229910052744 lithium Inorganic materials 0.000 claims description 8
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims 1
- 230000002238 attenuated effect Effects 0.000 abstract description 4
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- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 4
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- 238000002485 combustion reaction Methods 0.000 description 2
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- 230000007547 defect Effects 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
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Abstract
一种电池包高低温控制系统,包括整车控制器、主电池包、主电池包BMS、副电池包、副电池包BMS和直流同压/降压充电机;不耐低温的电芯,在低温下只要放电,无论是驱动车辆、电池包加热、暖风等都会导致放电量断崖式下降,原因并不是低温下用电量增大所致,而是低温下放电损伤自身,这才是电池衰减严重的主要因素。本发明中电池包高低温控制系统中包括主、副两个电池包,主电池包为非耐低温电芯,副电池包为耐低温电芯,两个电池包由整车控制器控制独立运行;低温环境下,整车控制器控制副电池包放电工作,并驱动冷却/加热控制器为主电池包加热,待到主电池包温度到达适合工作的温度后,切断副电池包放电,防止主电池包衰减严重和损伤电芯。
Description
技术领域
本发明涉及新能源汽车及储能技术领域,尤其是一种低温环境下防止主电池包衰减严重和损伤电芯、高温环境下消除主电池包叠加增温的电池包高低温控制系统。
背景技术
当前随着科技进步和经济发展,更多的人们越来越追求自由方便出行的交通工具,汽车是人们最常用交通工具之一;传统汽车虽然方便了人类的出行,但是它产生的废气给人类带来了巨大的污染,更重要的是作为汽车动力来源的汽油、柴油等原料日趋紧张,于是人们想设计出电动汽车这种清洁能源汽车;电动汽车是指以车载电池包为动力,用电机驱动车轮行驶的车辆,优点是:节约燃油能源、减少废弃排放、效率高、噪音低;但是其缺点同样明显,也就是大部分电动汽车锂电池,包括磷酸铁锂、钴酸锂、锰酸锂、三元锂作为动力来源,目前,三元锂或磷酸铁锂电池是应用在电动汽车上最多的电池,以磷酸铁锂电池为例,这种电池安全性高,单体寿命较长,但磷酸铁锂有一个致命的缺点:
1、其性能受坏境温度的影响较大,在环境温度低于0℃时,电池的内阻迅速增加,磷酸铁锂锂离子电池使用的是有机电解液,在0℃以下时,导电率下降很快,从而降低电池容量;此外,在低温下充电,会导致电极表面固体电解质相界面(SEI)膜增厚,使SEI膜电阻增加;
2、低于电池包允许温度(比如0℃)的环境下对电池包进行充电,容易引起电池包产生析锂现象,对电池包造成损害,严重时可能导致电池包的隔膜刺穿,造成电池包内部短路,使得电池包温度较高而容易烧坏;如果在地理位置比较寒冷的地区,严寒低温环境下会使得电池包性能大大降低,新能源汽车的使用寿命也将大打折扣;在低温环境下需要对电池包加热,使得电池包的工作温度提升至正常工作温度范围内,这种自身给自身加热的方式会造成电池包的低温衰减严重和损伤电芯;而在严寒低温环境下如何提高电池包温度以保证电池包正常放电,保证电池包正常使用,成为当前亟待解决的问题。
发明内容
本发明为解决现有电池包加热方式技术的缺陷,提供了一种电池包高低温控制系统,该系统中包括用主、副两个电池包,主电池包为非耐低温电芯,副电池包为耐低温电芯,两个电池包由整车控制器控制独立运行;低温环境下,整车控制器控制副电池包放电工作,并驱动冷却/加热控制器为主电池包加热,待到主电池包温度到达适合工作的温度后,切断副电池包放电,达到了防止主电池包衰减严重和损伤电芯的目的;车辆在高速度行驶时主电池包输出电流大,主电池包温度升高,当主电池包达到高温临界值时,控制副电池包放电为主电池包冷却降温,待主电池包冷却降温后,再控制切断副电池包工作,达到了消除主电池包叠加增温现象,避免主电池包极限高温所导致的电池包自燃事故的目的;在低温放置时,如需立即驱动车辆,副电池包直接驱动汽车,达到了减少加温过程中车主等待时间长的目的;主电池包出现故障时,副电池包可以随时接管运行,无需等待救援拖车,达到了避免主电池包出现故障,车辆无法挪动和行驶的目的;
本发明解决其技术问题所采用的技术方案为,包括整车控制器、主电池包、主电池包BMS、副电池包、副电池包BMS和直流同压/降压充电机,其中,所述的主电池包容量大于副电池包容量,所述的副电池包的电芯为耐低温电芯,所述的主电池包和副电池包间设置有直流同压/降压充电机,所述的主电池包、副电池包和直流同压/降压充电机通过高压线路连接,所述的主电池包BMS监控主电池包状态,所述的副电池包BMS监控副电池包状态,所述的主电池包BMS、副电池包BMS与整车控制器间线路连接,所述的整车控制器控制主电池包和副电池包分别通过高压分配器为车辆上的冷却/加热控制器、空调/热泵控制器、驱动电机控制器、DC-DC转换器、移动电站等设备供电;
所述的副电池包耐低温电芯为钛酸锂或其他耐低温电芯,支持低温-50度可正常充放电;
本发明的工作过程为,低温环境用车之前,通过APP远程启动整车控制器,控制副电池包放电工作,副电池包通过高压分配器对车辆上的冷却/加热控制器供电,实现对主电池包加热,待到主电池包温度达到适合工作的温度后,完成车辆预热;用车时,直接控制主电池包驱动汽车即可;
优选的,低温下如需立即驱动车辆,则由副电池包直接驱动汽车即可;
优选的,车辆在高速度行驶时,主电池包输出电流大,主电池包温度升高,整车控制器判断主电池包BMS实时采集到的当前主电池包温度是否高于主电池包设定的最大保护温度;若判断主电池包达到最大保护温度临界值时,整车控制器控制由副电池包为冷却/加热控制器供电,为主电池包冷却降温,同时为其他车载设备供电,用以降低主电池包电量输出,待到主电池包冷却降温后,再切换至主电池包为车载设备供电;
优选的,主电池包正常工作时,整车控制器控制主电池包通过直流同压/降压充电机为副电池包充电,副电池包BMS实时采集当前副电池包的容量信息,如副电池包容量已满,整车控制器控制切断充电;
优选的,所述的主电池包和副电池包通过整车控制器控制,既可以单独为车辆上的冷却/加热控制器、空调/热泵控制器、驱动电机控制器、DC-DC转换器、移动电站等设备供电,也可以协同为车辆上的冷却/加热控制器、空调/热泵控制器、驱动电机控制器、DC-DC转换器、移动电站等设备供电。
本发明的有益效果是:不耐低温的电芯,在低温下只要放电,无论是驱动车辆、电池包加热、暖风等都会导致放电量断崖式下降,原因并不是低温下用电量增大所致,而是低温下放电损伤自身,这才是电池衰减严重的主要因素。本发明中电池包高低温控制系统中包括主、副两个电池包,主电池包为非耐低温电芯,副电池包为耐低温电芯,两个电池包由整车控制器控制独立运行;低温环境下,整车控制器控制副电池包放电工作,并驱动冷却/加热控制器为主电池包加热,待到主电池包温度到达适合工作的温度后,切断副电池包放电,达到了防止主电池包衰减严重和损伤电芯的有益效果;车辆在高速度行驶时主电池包输出电流大,主电池包温度升高,当主电池包达到高温临界值时,控制副电池包放电为主电池包冷却降温,待主电池包冷却降温后,再控制切断副电池包工作,达到了消除主电池包叠加增温现象,避免主电池包极限高温所导致的电池包自燃事故的有益效果;在低温放置时,如需立即驱动车辆,副电池包直接驱动汽车即可,达到了减少加温过程中车主等待时间长的有益效果;主电池包出现故障时,副电池包可以随时接管运行,无需等待救援拖车,达到了避免主电池包出现故障,车辆无法挪动和行驶的有益效果;兼具大中小型电池包加热,做到按需、分包加热,减少加热浪费能耗的有益效果。
附图说明:
图1、为发明的结构视图;
下面结合附图对本发明进一步说明。
具体实施方式:
本发明的具体实施方式是,包括整车控制器1、主电池包7、主电池包BMS6、副电池包14、副电池包BMS15和直流同压/降压充电机12,其中,所述的主电池包7容量大于副电池包14容量,所述的副电池包14的电芯为耐低温电芯,所述的主电池包7和副电池包14间设置有直流同压/降压充电机12,所述的主电池包7、副电池包14和直流同压/降压充电机12通过高压线路9连接,所述的主电池包BMS6监控主电池包7状态,所述的副电池包BMS15监控副电池包14状态,所述的主电池包BMS6、副电池包BMS15与整车控制器1间线路2、16连接,所述的整车控制器1控制主电池包7和副电池包14分别通过高压分配器10、13为车辆上的冷却/加热控制器3、空调/热泵控制器4、驱动电机控制器5、DC-DC转换器8、移动电站11等设备供电;
所述的副电池包耐低温电芯为钛酸锂或其他耐低温电芯,支持低温-50度可正常充放电;
实施例1,参照图1,低温环境用车之前,通过APP远程启动整车控制器1,控制副电池包14放电工作,副电池包14通过高压分配器13对车辆上的冷却/加热控制器3供电,实现对主电池包7加热,待到主电池包7温度达到适合工作的温度后,完成车辆预热;用车时,直接控制主电池包7驱动汽车即可;
实施例2,参照图1,低温下如需立即驱动车辆,则由副电池包14直接驱动汽车即可;
实施例3,参照图1,车辆在高速度行驶时,主电池包7输出电流大,主电池包7温度升高,整车控制器1判断主电池包BMS6实时采集到的当前主电池包7温度是否高于主电池包7设定的最大保护温度;若判断主电池包7达到最大保护温度临界值时,整车控制器1控制由副电池包14为冷却/加热控制器3供电,为主电池包7冷却降温,同时为其他车载设备供电,用以降低主电池包7电量输出,待到主电池包7冷却降温后,再切换至主电池包7为车载设备供电;
实施例4,参照图1,主电池包7正常工作时,整车控制器1控制主电池包7通过直流同压/降压充电机12为副电池包14充电,副电池包BMS15实时采集当前副电池包14的容量信息,如副电池包14容量已满,整车控制器1控制切断充电;所述的主电池包7和副电池包14通过整车控制器1控制,既可以单独为车辆上的冷却/加热控制器3、空调/热泵控制器4、驱动电机控制器5、DC-DC转换器8、移动电站11等设备供电,也可以协同为车辆上的冷却/加热控制器3、空调/热泵控制器4、驱动电机控制器5、DC-DC转换器8、移动电站11等设备供电;具体为,当主电池包7与驱动电机控制器联5通时,主电池包7既可以同时为车辆上的冷却/加热控制器3、空调/热泵控制器4、DC-DC转换器8、移动电站11等设备供电,也可以通过整车控制器1控制由副电池包14向车辆上的冷却/加热控制器3、空调/热泵控制器4、DC-DC转换器8、移动电站11等设备供电;当副电池包14与驱动电机控制器5联通时,副电池包14既可以同时为车辆上的冷却/加热控制器3、空调/热泵控制器4、DC-DC转换器8、移动电站11等设备供电,也可以通过整车控制器1控制由主电池包7向车辆上的冷却/加热控制器3、空调/热泵控制器4、DC-DC转换器8、移动电站11等设备供电;
本发明中,副电池包14的容量可以根据需求预先设定,只要车辆空间允许,甚至可以做到与主电池包7相同的容量;亦可以根据实际需要设置多个电池包;本发明的设计理念可用于电动乘用车、电动大小巴士、电动大中小卡车、电动插车、中大型电动飞机、电动工程机械、储能等领域,采用本发明的设计理念可兼具大中小型电池包,例如大型卡车和大型储能等领域加热,做到按需、分包加热,减少加热浪费能耗。
Claims (7)
1.一种电池包高低温控制系统,包括整车控制器、主电池包、主电池包BMS、副电池包、副电池包BMS和直流同压/降压充电机,其特征是:所述的主电池包容量大于副电池包容量,所述的副电池包的电芯为耐低温电芯,所述的主电池包和副电池包间设置有直流同压/降压充电机,所述的主电池包、副电池包和直流同压/降压充电机通过高压线路连接,所述的主电池包BMS监控主电池包状态,所述的副电池包BMS监控副电池包状态,所述的主电池包BMS、副电池包BMS与整车控制器间线路连接,所述的整车控制器控制主电池包和副电池包分别通过高压分配器为车辆上的冷却/加热控制器、空调/热泵控制器、驱动电机控制器、DC-DC转换器、移动电站等设备供电。
2.根据权利要求1所述的一种电池包高低温控制系统,其特征是:所述的副电池包耐低温电芯为钛酸锂或其他耐低温电芯,支持低温-50度可正常充放电。
3.根据权利要求1所述的一种电池包高低温控制系统,其特征是:本发明的工作过程为,低温环境用车之前,通过APP远程启动整车控制器,控制副电池包放电工作,副电池包通过高压分配器对车辆上的冷却/加热控制器供电,实现对主电池包加热,待到主电池包温度达到适合工作的温度后,完成车辆预热;用车时,直接控制主电池包驱动汽车即可。
4.根据权利要求1所述的一种电池包高低温控制系统,其特征是:优选的,低温下如需立即驱动车辆,则由副电池包直接驱动汽车即可。
5.根据权利要求1所述的一种电池包高低温控制系统,其特征是:优选的,车辆在高速度行驶时,主电池包输出电流大,主电池包温度升高,整车控制器判断主电池包BMS实时采集到的当前主电池包温度是否高于主电池包设定的最大保护温度;若判断主电池包达到最大保护温度临界值时,整车控制器控制由副电池包为冷却/加热控制器供电,为主电池包冷却降温,同时为其他车载设备供电,用以降低主电池包电量输出,待到主电池包冷却降温后,再切换至主电池包为车载设备供电。
6.根据权利要求1所述的一种电池包高低温控制系统,其特征是:优选的,主电池包正常工作时,整车控制器控制主电池包通过直流同压/降压充电机为副电池包充电,副电池包BMS实时采集当前副电池包的容量信息,如副电池包容量已满,整车控制器控制切断充电。
7.根据权利要求1所述的一种电池包高低温控制系统,其特征是:优选的,所述的主电池包和副电池包通过整车控制器控制,既可以单独为车辆上的冷却/加热控制器、空调/热泵控制器、驱动电机控制器、DC-DC转换器、移动电站等设备供电,也可以协同为车辆上的冷却/加热控制器、空调/热泵控制器、驱动电机控制器、DC-DC转换器、移动电站等设备供电。
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