CN218919053U - Cells and power equipment - Google Patents
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- CN218919053U CN218919053U CN202223599772.0U CN202223599772U CN218919053U CN 218919053 U CN218919053 U CN 218919053U CN 202223599772 U CN202223599772 U CN 202223599772U CN 218919053 U CN218919053 U CN 218919053U
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000004519 grease Substances 0.000 claims description 4
- 229920001296 polysiloxane Polymers 0.000 claims description 4
- 239000000741 silica gel Substances 0.000 claims description 4
- 229910002027 silica gel Inorganic materials 0.000 claims description 4
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- 230000009286 beneficial effect Effects 0.000 description 10
- 230000017525 heat dissipation Effects 0.000 description 6
- 238000009413 insulation Methods 0.000 description 6
- 229910001416 lithium ion Inorganic materials 0.000 description 5
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
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- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 229910001290 LiPF6 Inorganic materials 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
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- 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
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Abstract
Description
技术领域technical field
本实用新型涉及动力电池技术领域,特别涉及一种电芯。同时,本实用新型还涉及一种具有该电芯的动力设备。The utility model relates to the technical field of power batteries, in particular to an electric core. At the same time, the utility model also relates to a power device with the electric core.
背景技术Background technique
锂离子电池因其工作电压高、比能量高、容量大、自放电小、循环性好、使用寿命长、重量轻、体积小等优点,已成为现代高性能电池的代表。而高的能量密度和高的安全性能是锂离子电池最重要的指标也是制约锂离子发展的关键。Lithium-ion batteries have become the representative of modern high-performance batteries because of their high operating voltage, high specific energy, large capacity, small self-discharge, good cycle performance, long service life, light weight, and small size. High energy density and high safety performance are the most important indicators of lithium-ion batteries and the key to restricting the development of lithium-ion batteries.
锂离子电池中最广泛使用的电解液体系是LiPF6的混合碳酸脂溶液,此类溶剂挥发性高、闪点低、非常容易燃烧。当撞击或者变形引起内部短路,大倍率充放电和过充,就会产生大量的热,导致电池温度升高。当达到一定温度时,就会引发一系列化学反应,使电池热平衡收到破坏,若这些热量不能及时疏散,便会加剧反应的进行,并引发一连串的自加热副反应,电池温度急剧升高,发生热失控,最终导致电池燃烧,严重时甚至发生爆炸。现有技术中,通常采用添加阻燃添加剂、过充添加剂、使用含氟溶剂、设置防爆阀等方法解决电池温度升高的问题。The most widely used electrolyte system in lithium-ion batteries is the mixed carbonate solution of LiPF6. This kind of solvent has high volatility, low flash point and is very flammable. When impact or deformation causes internal short circuit, high-rate charge and discharge and overcharge, a large amount of heat will be generated, which will cause the battery temperature to rise. When a certain temperature is reached, a series of chemical reactions will be triggered, which will destroy the thermal balance of the battery. If the heat cannot be evacuated in time, the reaction will be intensified, and a series of self-heating side reactions will be triggered, and the battery temperature will rise sharply. Thermal runaway occurs, eventually causing the battery to burn, and even explode in severe cases. In the prior art, methods such as adding flame retardant additives, overcharge additives, using fluorine-containing solvents, and installing explosion-proof valves are usually used to solve the problem of battery temperature rise.
另外,目前锂离子单体电芯的基本结构为:壳体、极组(电极组件)、裸电芯绝缘片、盖板(通常设置有极柱、注液孔)、防爆机构等,壳体和盖板构成容纳电极组件的封闭空间,极组与壳体之间存在大量间隙,影响电芯的散热。In addition, the current basic structure of a lithium-ion cell is: a shell, an electrode group (electrode assembly), a bare cell insulation sheet, a cover plate (usually equipped with a pole, a liquid injection hole), an explosion-proof mechanism, etc., the shell And the cover plate constitutes a closed space for accommodating the electrode assembly, and there is a large gap between the electrode group and the casing, which affects the heat dissipation of the battery cell.
实用新型内容Utility model content
有鉴于此,本实用新型旨在提出一种电芯,以提高电芯的散热和排气效果,进而提高电芯的安全性。In view of this, the utility model aims to propose a battery cell to improve the heat dissipation and exhaust effect of the battery cell, and further improve the safety of the battery cell.
为达到上述目的,本实用新型的技术方案是这样实现的:In order to achieve the above object, the technical solution of the utility model is achieved in that:
一种电芯,所述电芯包括至少一端敞口设置的壳体,收容于所述壳体内的极组本体,以及用于封堵所述敞口的盖板,所述盖板上设有防爆装置;An electric core, the electric core comprises a casing with at least one end open, an electrode group body accommodated in the casing, and a cover plate for blocking the opening, the cover plate is provided with explosion-proof device;
所述极组本体和所述壳体之间填充有绝缘导热层,且所述绝缘导热层上设有沿所述极组本体的长度方向贯通设置的排气通道。An insulating and heat-conducting layer is filled between the electrode group body and the housing, and an exhaust channel is provided on the insulating and heat-conducting layer along the length direction of the electrode group body.
进一步的,所述排气通道为沿所述极组本体的周向间隔布置的多个。Further, the exhaust passages are arranged in multiples at intervals along the circumference of the pole group body.
进一步的,位于同一侧的多个所述排气通道的面积为所述极组本体对应侧面积的60~70%。Further, the area of the plurality of exhaust passages located on the same side is 60-70% of the area of the corresponding side of the pole group body.
进一步的,所述绝缘导热层上设有贯通自身厚度方向设置的多个通孔,所述通孔与所述排气通道相连通。Further, the insulating and heat-conducting layer is provided with a plurality of through holes through its thickness direction, and the through holes communicate with the exhaust channel.
进一步的,多个所述通孔沿所述极组本体的长度方向间隔设于所述绝缘导热层上。Further, a plurality of through holes are arranged on the insulating and heat-conducting layer at intervals along the length direction of the pole group body.
进一步的,所述排气通道为设于所述绝缘导热层朝向所述壳体一侧设置的凹槽;Further, the exhaust channel is a groove provided on the side of the insulating and heat-conducting layer facing the housing;
所述凹槽的高度为所述绝缘导热层厚度的1/3~1/2。The height of the groove is 1/3˜1/2 of the thickness of the insulating and heat-conducting layer.
进一步的,所述绝缘导热层与所述极组本体和所述壳体过盈配合;Further, the insulating and heat-conducting layer is in interference fit with the pole group body and the casing;
和/或,所述绝缘导热层的厚度范围为0.4~0.5mm。And/or, the thickness of the insulating and heat-conducting layer ranges from 0.4 to 0.5 mm.
进一步的,所述绝缘导热层以热熔的方式固连于所述极组本体和或所述壳体上。Further, the insulating and heat-conducting layer is fixedly connected to the pole group body and/or the housing in a hot-melt manner.
进一步的,所述绝缘导热层采用导热硅胶或者导热硅脂制成。Further, the insulating and heat-conducting layer is made of heat-conducting silica gel or heat-conducting silicone grease.
相对于现有技术,本实用新型具有以下优势:Compared with the prior art, the utility model has the following advantages:
本实用新型所述的电芯,通过在极组本体和壳体之间填充有绝缘导热层,利于提高极组本体的散热效果,从而利于降低极组本体的温度,减少电芯发生热失控的几率,进而利于提高电芯的安全性能;并通过绝缘导热层上的排气通道,利于电芯内部的气体通过防爆装置排出,从而提高电芯的安全性。The battery cell described in the utility model is filled with an insulating and heat-conducting layer between the pole group body and the shell, which is beneficial to improve the heat dissipation effect of the pole group body, thereby reducing the temperature of the pole group body and reducing the occurrence of thermal runaway of the battery cell. probability, which in turn helps to improve the safety performance of the battery core; and through the exhaust channel on the insulating heat-conducting layer, it is beneficial for the gas inside the battery core to be discharged through the explosion-proof device, thereby improving the safety of the battery core.
此外,通过多个排气通道利于提高电芯内部的排气效率。排气通道所占面积的设置,利于提高排气效率,且便于布置实施。通孔的设置,利于进一步提高排气的效率。通过通孔沿极组本体的长度方向间隔布置,利于布置实施,且排气效果好。凹槽的结构简单,便于加工成型。In addition, multiple exhaust channels are beneficial to improve the exhaust efficiency inside the cell. The setting of the area occupied by the exhaust channel is beneficial to improve the exhaust efficiency and is convenient for layout and implementation. The arrangement of the through holes is beneficial to further improving the exhaust efficiency. The through holes are arranged at intervals along the length direction of the pole group body, which is convenient for arrangement and implementation, and has a good exhaust effect. The groove has a simple structure and is convenient for processing and forming.
另外,绝缘导热层过盈配合,利于提高极组本体和壳体之间的热传导效率。绝缘导热层以热熔的方式固连,利于布置实施,且连接效果好。导热硅胶或者导热硅脂的产品成熟,具有较好的绝缘导热性能。In addition, the interference fit of the insulating and heat-conducting layer is conducive to improving the heat conduction efficiency between the electrode group body and the shell. The insulating and heat-conducting layer is fixed in the form of thermal fusion, which is convenient for layout and implementation, and the connection effect is good. Thermally conductive silica gel or thermally conductive silicone grease are mature products with good insulation and thermal conductivity.
另外,本实用新型的另一目的在于提出一种动力设备,所述动力设备中设有如上所述的电芯。In addition, another object of the present utility model is to provide a power device, wherein the power device is provided with the above-mentioned electric core.
本实用新型所述的动力设备,通过设置如上所述的电芯,利于提高动力设备的冷却性能和安全性能,而具有较好的实用性。The power equipment described in the utility model is provided with the electric core as described above, which is beneficial to improve the cooling performance and safety performance of the power equipment, and has better practicability.
附图说明Description of drawings
构成本实用新型的一部分的附图用来提供对本实用新型的进一步理解,本实用新型的示意性实施例及其说明用于解释本实用新型,并不构成对本实用新型的不当限定。在附图中:The accompanying drawings constituting a part of the utility model are used to provide a further understanding of the utility model, and the schematic embodiments of the utility model and their descriptions are used to explain the utility model, and do not constitute improper limitations to the utility model. In the attached picture:
图1为本实用新型实施例所述的绝缘导热层的结构示意图;Fig. 1 is a schematic structural view of the insulating and heat-conducting layer described in the embodiment of the present invention;
附图标记说明:Explanation of reference signs:
1、绝缘导热层;101、排气通道;102、通孔。1. Insulation and heat conduction layer; 101, exhaust channel; 102, through hole.
具体实施方式Detailed ways
需要说明的是,在不冲突的情况下,本实用新型中的实施例及实施例中的特征可以相互组合。It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.
在本实用新型的描述中,需要说明的是,若出现“上”、“下”、“内”、“背”等指示方位或位置关系的术语,其为基于附图所示的方位或位置关系,仅是为了便于描述本实用新型和简化描述,而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作,因此不能理解为对本实用新型的限制。此外,若出现“第一”、“第二”等术语,其也仅用于描述目的,而不能理解为指示或暗示相对重要性。In the description of the present utility model, it should be noted that if there are terms such as "upper", "lower", "inner", "back", etc. indicating orientation or positional relationship, it is based on the orientation or position shown in the drawings. The relationship is only for the convenience of describing the utility model and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the utility model. In addition, if terms such as "first" and "second" appear, they are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
下面将参考附图并结合实施例来详细说明本实用新型。The utility model will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
本实施例涉及一种电芯整体构成上,该电芯包括至少一端敞口设置的壳体,收容于壳体内的极组本体,以及用于封堵敞口的盖板,盖板上设有防爆装置。极组本体和壳体之间填充有绝缘导热层1,且绝缘导热层1上设有沿极组本体的长度方向贯通设置的排气通道101。This embodiment relates to the overall structure of an electric core. The electric core includes a casing with at least one end open, an electrode group body accommodated in the casing, and a cover plate for sealing the opening. The cover plate is provided with Explosion-proof device. An insulating and heat-conducting layer 1 is filled between the pole group body and the housing, and an
基于如上整体介绍,本实施例中绝缘导热层1的一种示例性结构如图1中所示。本实施例中的电芯为现有技术中的刀片电芯,壳体的两端均具有盖板,其一盖板上设有防爆装置,当然,本实施例中的电芯还可为现有技术中的方形电芯,此时,壳体的一端具有盖板和防爆装置。其中,本实施例中的防爆装置可采用现有技术中成熟的产品,例如防爆装置采用防爆阀等,其产品成熟,利于提高电芯的安全性。本实施例中,排气通道101排出的气体具体经由防爆阀排出电芯外。Based on the overall introduction above, an exemplary structure of the insulating and heat-conducting layer 1 in this embodiment is shown in FIG. 1 . The battery cell in this embodiment is a blade battery cell in the prior art, and both ends of the casing have cover plates, and an explosion-proof device is provided on one of the cover plates. Of course, the battery cell in this embodiment can also be an existing There is a square electric core in the technology, at this time, one end of the casing has a cover plate and an explosion-proof device. Wherein, the explosion-proof device in this embodiment can adopt mature products in the prior art, for example, the explosion-proof device adopts an explosion-proof valve, etc., and the product is mature, which is conducive to improving the safety of the battery cell. In this embodiment, the gas exhausted from the
本实施例中的极组本体整体呈长方体形,绝缘导热层1包裹在极组本体外,具体来讲,绝缘导热层1绕设在极组本体的周向上,绝缘导热层1的两端搭接设置,以具有较好的包裹效果。具体实施时,作为优选的,该绝缘导热层1采用热熔的方式固定在极组本体和/或壳体上。另外,绝缘导热层1与极组本体和壳体过盈配合,如此利于提高极组本体和壳体之间的热传导效果,从而利于将极组本体产生的热量传递至壳体,进而利于提高极组本体的散热效果,而利于提高电芯在使用中的安全性。The body of the pole group in this embodiment is in the shape of a cuboid as a whole, and the insulating and heat-conducting layer 1 is wrapped outside the body of the pole group. Set directly to have a better wrapping effect. During specific implementation, preferably, the insulating and heat-conducting layer 1 is fixed on the pole group body and/or the shell by means of thermal fusion. In addition, the insulating and heat-conducting layer 1 has an interference fit with the pole group body and the housing, which is beneficial to improve the heat conduction effect between the pole group body and the housing, thereby facilitating the transfer of heat generated by the pole group body to the housing, thereby improving the efficiency of the pole group. The heat dissipation effect of the group body is beneficial to improve the safety of the battery cell in use.
本实施例中绝缘导热层1的厚度范围为0.4~0.5mm,例如,厚度为0.4mm、0.45mm或者0.5mm。具体实施时,还可根据极组本体和壳体之间的间距对绝缘导热层1的厚度进行选取。In this embodiment, the thickness of the insulating and heat-conducting layer 1 ranges from 0.4 to 0.5 mm, for example, the thickness is 0.4 mm, 0.45 mm or 0.5 mm. During specific implementation, the thickness of the insulating and heat-conducting layer 1 can also be selected according to the distance between the pole group body and the casing.
为提高排气效率,本实施例中的排气通道101为沿极组本体的周向间隔布置的多个,位于同一侧的多个排气通道101的面积为极组本体对应侧面积的60~70%。具体实施时,排气通道101为设于绝缘导热层1朝向壳体一侧设置的凹槽,凹槽的高度为绝缘导热层1厚度的1/3~1/2。例如,凹槽的高度为绝缘导热层1厚度的1/3或者1/2。如此设置,便于排气通道101在绝缘导热层1上的加工成型和布置实施,同时还利于提高绝缘导热层1在使用中的排气效率。In order to improve the exhaust efficiency, the
为进一步提高绝缘导热层1在使用中的排气效率,本实施例中,如图1中所示,绝缘导热层1上设有贯通自身厚度方向设置的多个通孔102,通孔102与排气通道101相连通。作为一种优选的实施方式,多个通孔102沿极组本体的长度方向间隔设于绝缘导热层1上。In order to further improve the exhaust efficiency of the insulating and heat-conducting layer 1 in use, in this embodiment, as shown in FIG. The
本实施例中的绝缘导热层1采用导热硅胶或者导热硅脂制成,两者均具有较好的绝缘和导热效果,从而利于提高电芯的安全性以及散热效果。The insulating and heat-conducting layer 1 in this embodiment is made of heat-conducting silica gel or heat-conducting silicone grease, both of which have good insulation and heat-conducting effects, thereby helping to improve the safety and heat dissipation effect of the battery cell.
本实施例中所述的电芯在装配时,先将极组本体上的负极极耳与负极极柱焊接,再将绝缘导热层1包在极组本体外侧,然后安装正极盖板,将绝缘导热层1分别与正极盖板、负极盖板下塑胶通过热熔方式粘结固定,最后进行极组本体的入壳。When assembling the battery cell described in this embodiment, first weld the negative electrode lug on the pole group body to the negative pole post, then wrap the insulating and heat-conducting layer 1 on the outside of the pole group body, and then install the positive cover plate to seal the insulation The heat conduction layer 1 is respectively bonded and fixed with the positive electrode cover plate and the plastic under the negative electrode cover plate by hot melting, and finally the electrode group body is put into the shell.
此外,本实施例的绝缘导热层1还可采用流体材料打结而成,首先将与负极极柱焊接完成的极组本体装入壳体,在正极极耳与极柱焊接之前,往壳体与极组本体之间的间隙中压力填充流体绝缘导热材料,该绝缘导热材料随后凝固成型,良好的填充在壳体与极组本体之间,实现极组本体与壳体之间的良好接触,大大提高导热效率。In addition, the insulating and heat-conducting layer 1 of this embodiment can also be knotted with fluid materials. Firstly, the pole group body that has been welded to the negative pole post is put into the casing, and before the positive pole lug is welded to the pole post, it is put into the casing. The gap between the pole group body and the pole group body is pressure-filled with a fluid insulating and heat-conducting material, which is then solidified and formed, and is well filled between the shell and the pole set body to achieve good contact between the pole set body and the shell. Greatly improve heat conduction efficiency.
本实施例所述的电芯,通过在极组本体和壳体之间填充有绝缘导热层1,利于提高极组本体的散热效果,从而利于降低极组本体的温度,减少电芯发生热失控的几率,进而利于提高电芯的安全性能;并通过绝缘导热层1上的排气通道101,利于电芯内部的气体通过防爆装置排出,从而提高电芯的安全性。另外,绝缘导热层1还可以起到良好的绝缘效果,减少极组本体与壳体之间短路问题的发生,进而利于提高电芯的安全性能。此外,本实施例中的绝缘导热层1可以大大提高极组本体与壳体的贴合效果,使极组本体因电化学反应产生的热量及时通过热传导导入壳体,随后通过热扩散,将热量扩散出去,大大降低了防爆阀开启率,有效保证的电芯的安全性。The battery cell described in this embodiment is filled with an insulating and heat-conducting layer 1 between the pole group body and the casing, which is beneficial to improving the heat dissipation effect of the pole group body, thereby helping to reduce the temperature of the pole group body and reducing thermal runaway of the battery cell probability, which in turn helps to improve the safety performance of the battery cell; and through the
此外,本实施例还涉及一种动力设备,该动力设备中设有如上所述的电芯。本实施例所述的动力设备可为电池模组或电池包等通过设置如上所述的电芯,利于提高动力设备的冷却性能和安全性能,而具有较好的实用性。In addition, the present embodiment also relates to a power device, the power device is provided with the battery cell as described above. The power equipment described in this embodiment can be a battery module or a battery pack, etc. By setting the above-mentioned batteries, it is beneficial to improve the cooling performance and safety performance of the power equipment, and has better practicability.
以上所述仅为本实用新型的较佳实施例而已,并不用以限制本实用新型,凡在本实用新型的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本实用新型的保护范围之内。The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included in the Within the protection scope of the present utility model.
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