CN110770967A - 车辆用电池冷却装置以及电池模块 - Google Patents
车辆用电池冷却装置以及电池模块 Download PDFInfo
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Abstract
一种车辆用电池冷却装置(20),其对包括多个单电池的电池包进行冷却,该车辆用电池冷却装置(20)包括:壳体(22),装入有用于冷却电池包的冷却液(30);配管(26),从壳体(22)内穿过,供使冷却液(30)冷却的制冷剂流动;以及控制阀(34),被设置于配管(26),根据电池包的温度而将制冷剂放出到壳体(22)内。
Description
技术领域
本公开涉及车辆用电池冷却装置以及电池模块。
背景技术
在混合动力汽车或电动汽车中,搭载有向驱动源即马达供给电力的电池模块。电池模块包括由多个单电池构成的电池包。设置在电池包中的单电池存在例如因短路等而热失控(温度异常上升)的情况。
作为对热失控的单电池进行冷却的技术,已知有如下的电池装置(电池模块),其向壳体内容纳的单电池所产生的燃烧气体暴露的位置,从规定的阀门喷射不可燃性的制冷剂(例如,参照专利文献1)。
[现有技术文献]
[专利文献]
专利文献1:日本特开2009-238654号公报
发明内容
[发明要解决的课题]
在专利文献1的电池装置中,在热失控的单电池处于远离喷射制冷剂的阀门的位置的情况下,存在即便向壳体内喷射制冷剂也不能充分地冷却的可能性。也想到了检测热失控的单电池的位置并改变制冷剂的喷射位置或方向的结构,但此时结构可能会复杂化。
本公开是鉴于这样的情况而提出的,其目的在于提供一种车辆用电池冷却装置,其在电池包内的单电池热失控的情况下,能够以简单的结构均匀地冷却电池包整体。
[用于解决技术课题的技术方案]
解决上述课题的本公开的一方案为冷却包括多个单电池的电池包的车辆用电池冷却装置。该车辆用电池冷却装置包括:壳体,装入有用于冷却电池包的冷却液;配管,穿过壳体内,供使冷却液冷却的制冷剂流动;以及控制阀,被设置于配管,根据电池包的温度而将制冷剂放出到壳体内。
[发明效果]
根据本公开,能够提供一种车辆用电池冷却装置,其在电池包内的单电池热失控的情况下,能够以简单的结构均匀地冷却电池包整体。
附图说明
图1是示出本公开的实施例的电池模块的图。
图2是本公开的实施例的冷却装置的立体图。
图3是本公开的实施例的冷却装置的分解图。
图4是示出本公开的实施例的配管的路径的概要图。
图5是示出本公开的实施例的电池模块的构成的框图。
图6是示出本公开的实施例的电池模块执行的冷却处理的流程的图。
具体实施方式
在下面的实施例中,对相同的构成要素标注相同的附图标记,省略重复的说明。另外,在各附图中,为了说明方便,适当省略构成要素的一部分。
在具体说明本公开的实施例之前,说明概要。实施例涉及对被搭载在车辆中的电池包进行冷却的车辆用电池冷却装置。该车辆用电池冷却装置包括承载电池包的壳体和穿过壳体内的配管。在壳体中装入冷却电池包的冷却液。使冷却液冷却的制冷剂在配管中流动。在壳体内的配管上设置有控制阀。在构成电池包的多个单电池的任一个因短路等而热失控的情况下,打开控制阀向壳体内(冷却液中)放出制冷剂。制冷剂通过从低压状态被放出到大气中而形成极低温(-20℃以下),该制冷剂在冷却液中扩散时壳体整体的温度降低。由此,能够均匀地冷却电池包整体,热失控的单电池不论其位置如何都能得到冷却。下面,具体地说明实施例。
图1是本公开的实施例的电池模块100的立体图。电池模块100包括电池包10和车辆用电池冷却装置20。在下文中,将车辆用电池冷却装置20简称为冷却装置20。电池包10包括彼此连接的多个单电池12,向没有图示的车辆的驱动马达供电。单电池12是锂离子充电电池,被收纳在由铝合金形成的框体14中。电池包10被搭载在冷却装置20的上表面,从底面侧冷却各单电池12。
图2是本公开的实施例的冷却装置20的立体图,图3是其分解图。冷却装置20包括壳体22、盖24、配管26、O环28、控制阀34和搅拌机36。壳体22由树脂材料形成上表面被开口的箱状,冷却液30装入壳体22中。冷却液30是包含乙二醇的防冻液。盖24由树脂材料形成与壳体22的开口相同的形状,被覆盖壳体22的开口地固定。O环28嵌入壳体22和盖24之间,密封装入有冷却液30的空间。
配管26穿过壳体22的内部,供使冷却液30冷却的制冷剂流动。制冷剂的一个示例为HFC(Hydro Fluoro Carbon:氢氟烃)。配管26穿过侧面的配管口32被引导至壳体22的内部,在壳体22的内部往复后,穿过配管口32被导出至外部。配管口32由没有图示的密封材料密封。控制阀34被设置于穿过壳体22的内部的配管26。
控制阀34是通过螺线管推动柱塞开闭阀门的电动双通阀,对应于电池包10的温度开阀,将制冷剂放出到壳体22的内部。制冷剂通过从在配管26内的低压状态被放出到大气中而形成极低温(-20℃以下)。被放出的制冷剂在冷却液30中扩散后,壳体22整体的温度降低,能够均匀地冷却电池包10。此外,控制阀34的位置只要在壳体22的内部即可,不被限定。另外,在壳体22上设置有未图示的压力控制阀。压力控制阀在控制阀34放出制冷剂的情况下开阀,将内部的气体放出至外部并使内部的压力保持恒定。
搅拌机36是包括旋转叶片的搅拌扇,被设置在壳体22的内部,搅拌冷却液30。通过搅拌机36的搅拌,壳体22的内部的冷却液30的温度差减小。另外,从控制阀34放出制冷剂时,加速壳体22中制冷剂的扩散。由此,在短时间内壳体22整体的温度降低。可以使用电动水泵作为搅拌机36。这种情况也得到相同的效果。控制阀34及搅拌机36被由穿过配管口32的布线连接的后述的冷却控制部控制而工作。
图4是示出本公开的实施例的配管26的路径的概要图。在配管26的路径中,设置有压缩机38、冷凝器40和膨胀阀42。压缩机38压缩通过冷却装置20吸收电池包10的热的制冷剂(气体制冷剂)。被压缩而成为高压气体的制冷剂在冷凝器40中由没有图示的送风机冷却、液化。液化的制冷剂从膨胀阀42的微小的喷嘴孔被喷射到冷却装置20的内部的配管26内,形成低温低压的气液混合状态并穿过冷却装置20的内部,经由冷却液30吸收包括电池包10的周围的热。经由冷却液冷却的电池包10的制冷剂再次从冷却装置20向压缩机38流动。
图5是示出本公开的实施例的电池模块100的结构的框图。本说明书的框图所示的各框,在硬件上,能够通过计算机的CPU为代表的元件或机械装置实现,在软件方面通过计算机程序等实现,在此,叙述通过它们的协作而实现的功能框。因此,本领域技术人员应当理解,这些功能框能够通过硬件、软件的组合以各种形式实现。
电池包10包括温度检测部44和电池控制部46。温度检测部44根据现有的公知技术检测电池包10的温度。电池控制部46控制从电池包10向包括驱动马达在内的各部分的电力供给。电池控制部46在电池包10的温度超过第一温度的情况下,阻断向各部分的电力供给,停止电池包10。第一温度是判断在电池包10内部的单电池12发生异常的阈值,被预先设定。
冷却装置20包括控制控制阀34及搅拌机36的冷却控制部48。在被电池控制部46停止而经过了规定时间后的电池包10的温度超过第二温度的情况下,冷却控制部48打开控制阀34并驱动搅拌机36。第二温度是判断在电池包10的任一单电池12发生热失控的阈值,被预先设定为大于等于第一温度的值。
图6是示出本公开的实施例的电池模块100执行的冷却处理的流程的图。电池模块100以规定的周期反复执行图6所示的冷却处理。
首先,温度检测部44检测电池包10的温度(S11)。接着,电池控制部46比较电池包10的温度和上述第一温度(S12)。电池包10的温度大于等于第一温度的情况下(S12的Y),电池包10内部的单电池12可能发生异常,因此电池控制部46阻断向各部分供给电力并使电池包10处于停止状态(S13)。在电池包10的温度低于第一温度的情况下(S12的N),判断为电池包10内部的单电池12正常工作并结束处理。
在停止电池包10的情况下,从停止开始经过规定时间后,温度检测部44再次检测电池包10的温度(S14)。接着,冷却控制部48比较电池包10的温度和上述第二温度(S15)。在尽管停止后经过了规定时间,而电池包10的温度没有下降,进一步上升到大于等于第二温度的情况下(S15的Y),可能在任意的单电池12发生了因短路等的热失控,因此冷却控制部48打开控制阀34(S16)。另外,冷却控制部48驱动搅拌机36(S17)。控制阀34开阀时,向比配管26的内部低压的壳体22的内部喷出制冷剂,制冷剂在壳体22的内部扩散。另外,驱动搅拌机36,制冷剂迅速向壳体22的整体扩散。由此,壳体22整体的温度降低,能够均匀地冷却电池包10。
在停止电池包10经过规定时间后温度小于第二温度的情况下(S15的N),视为没有发生单电池12的热失控,不放出制冷剂,结束处理。已放出过一次制冷剂的冷却装置20无法继续使用因而需要更换。通过在停止电池包10后温度降低的情况下不放出制冷剂的处理,能够避免不必要的冷却装置20的更换。此外,电池包10的温度大于等于第一温度的情况下,可以通过设置在车厢内的显示器或扬声器等,向驾驶员通知电池的异常。由此,能够促使驾驶员迅速地采取对策。
根据本公开的实施例,在电池包10内的单电池热失控的情况下,能够以简单的结构均匀地冷却电池包10。可以冷却电池包10整体,能够与其位置无关地更可靠地冷却热失控的单电池12。
以上基于实施例说明了本公开。本领域技术人员应当理解,该实施例为示例,能够对它们的各构成元件或各处理程序的组合施以多种变形例,并且以此得到的变形例也包含在本公开的范围内。
例如,可以在冷却装置20中将控制阀34及搅拌机36的至少一者设置多个。此时,当开放控制阀34时,能够在短时间内降低壳体22整体的温度。另外,温度检测部44可以逐个检测多个单电池12的温度。此时,能够精度更加良好地检测单电池12的异常。并且,在实施例中,在打开控制阀34时驱动搅拌机36,但并不限定于此,可以常时驱动搅拌机36。此时,壳体22整体保持在均匀的温度,因此提高电池包10的冷却性能。
本公开的一个方案的概要如下。本公开的一方案是对包括多个单电池12的电池包10进行冷却的车辆用电池冷却装置20。车辆用电池冷却装置20包括:壳体22,装入有用于冷却电池包10的冷却液30;配管26,从壳体22内穿过,供使冷却液30冷却的制冷剂流过;以及控制阀34,被设置于配管26,根据电池包10的温度而将制冷剂放出到壳体22内。
根据该方案,在控制阀34根据电池包10的温度而开放时,比冷却液30温度低的制冷剂扩散,壳体22整体的温度降低。由此,能够均匀地冷却发生单电池12热失控这样的异常的电池包10整体。
还可以包括搅拌冷却液30的搅拌机36。此时,从控制阀34放出的制冷剂在短时间内向冷却液30中扩散,因此能够以更短的时间冷却电池包10。
也可以包括控制控制阀34的冷却控制部48。冷却控制部48也可以在检测到单电池的异常并停止工作的电池包10达到规定的温度的情况下,开放控制阀34。此时,能够抑制不必要地开放控制阀34而放出制冷剂的情况。
本公开的其他方案为电池模块100,其包括车辆用电池冷却装置20以及被搭载于该车辆用电池冷却装置20的、包括多个单电池12的电池包10。根据该方案,在发生单电池12热失控这样的异常的情况下,能够均匀地冷却电池包10的整体,因此能够抑制从单电池12喷射燃烧气体或着火这样的不良状况的发生。
[附图标记说明]
10电池包、12单电池、20车辆用电池冷却装置、22壳体、26配管、30冷却液、34控制阀、36搅拌机、48冷却控制部、100电池模块。
[工业上的可利用性]
根据本公开,提供一种车辆用电池冷却装置,其在电池包内的单电池热失控的情况下,能够以简单的结构均匀地冷却电池包整体。
Claims (4)
1.一种车辆用电池冷却装置,对包括多个单电池的电池包进行冷却,其特征在于,包括:
壳体,装入有用于冷却电池包的冷却液;
配管,从所述壳体内穿过,供使所述冷却液冷却的制冷剂流动;以及
控制阀,被设置于所述配管,根据电池包的温度而将所述制冷剂放出到所述壳体内。
2.根据权利要求1所述的车辆用电池冷却装置,其特征在于,还包括搅拌所述冷却液的搅拌机。
3.根据权利要求1或2所述的车辆用电池冷却装置,其特征在于,包括:
控制所述控制阀的冷却控制部;
在检测到单电池的异常而停止了工作的电池包达到规定的温度的情况下,所述冷却控制部使所述控制阀开放。
4.一种电池模块,其特征在于,包括:
权利要求1至3中任一项所述的车辆用电池冷却装置;以及
搭载于所述车辆用电池冷却装置、具备多个单电池的电池包。
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