CN215600465U

CN215600465U - Bradyseism battery module

Info

Publication number: CN215600465U
Application number: CN202121090847.5U
Authority: CN
Inventors: 黄启秋; 李新喜; 张国庆
Original assignee: Guangdong University of Technology
Current assignee: Guangdong University of Technology
Priority date: 2021-05-20
Filing date: 2021-05-20
Publication date: 2022-01-21
Anticipated expiration: 2031-05-20

Abstract

The application belongs to the technical field of phase change materials. The application provides a cushioning battery module, which comprises a box body and a battery bracket, wherein the battery bracket is made of a phase-change material; the battery bracket is placed in the box body and used for loading a battery; the battery bracket comprises loading barrels and connecting pieces for connecting the loading barrels in series at intervals; the loading barrel is provided with a loading hole for the battery to extend into, and the loading hole is in interference fit with the battery. The loading cylinders on the battery bracket are connected in series through the connecting pieces and distributed at intervals, so that the stability of supporting the battery can be effectively improved, and the influence of vibration on the battery can be buffered; and meanwhile, secondary heat dissipation coupling with air cooling or liquid cooling is facilitated, heat dissipation optimization of the battery module is realized, and heat absorption/release efficiency is improved. The utility model provides a bradyseism battery module breaks away from the problem of thermal contact with the battery when effectively avoiding revealing and vibrations.

Description

Bradyseism battery module

Technical Field

The application belongs to the technical field of phase change material, especially, relates to a bradyseism battery module.

Background

In recent years, development and utilization of sustainable green energy has become an important concern for sustainable development due to problems of energy shortage crisis, environmental pollution, and greenhouse effect caused by continuous consumption of fossil energy. The electric automobile using green clean energy can effectively reduce the consumption of the traditional fuel automobile to fossil energy and the emission of greenhouse gases. The performance and safety of the power battery, which is used as an energy supply component of the electric vehicle, directly affect the performance and safety of the electric vehicle, even the safety of the driver. In the actual use process, the power battery system is often required to experience different working conditions, such as high temperature, long-time use, high-rate discharge use and the like, and the working conditions are accompanied by a large amount of heat generation. When the heat of the battery cannot be transferred in time, the performance of the battery is degraded and even thermal runaway occurs. When the electric automobile is subjected to frequent vibration or collision, the battery cannot be correspondingly protected, and explosion is easily caused. Therefore, there is a need for an effective battery thermal management system for a power battery system that not only can ensure the normal operating temperature of the battery module, but also can protect the battery from external forces such as impact, collision, and vibration.

Currently, the mainstream battery thermal management is air cooling, liquid cooling, and phase change material cooling. Air cooling and liquid cooling are used as active cooling modes, so that not only can extra energy be consumed to realize heat dissipation protection of the battery in the use process, but also the air cooling and the liquid cooling cannot effectively protect the battery system from being damaged by impact, collision and vibration of external force. The phase-change material has the problems of poor uniformity, poor heat conductivity coefficient and easy leakage.

SUMMERY OF THE UTILITY MODEL

In view of this, the application provides a bradyseism battery module for solve phase change material degree of consistency poor, thermal conductivity is not good, easily reveal the technical problem.

The specific technical scheme of the application is as follows:

the application provides a preparation method of a thermotropic flexible phase change material with high stability, which comprises the following steps:

s1, melting the phase change base material, adding styrene-butadiene-styrene block copolymer, stirring and dissolving to obtain a semitransparent colloidal solution;

s2: adding ethylene propylene diene monomer into the semitransparent colloidal solution, stirring and melting to obtain viscous colloidal solution;

s3: and adding a heat conduction reinforcing agent into the viscous colloidal solution, stirring and mixing, and pouring into a mould for solidification to obtain the high-stability thermotropic flexible phase change material.

In the application, through adding ethylene propylene diene monomer (ethylene, propylene and non-conjugated diene copolymer), the crosslinking of styrene-butadiene-styrene block copolymer can be effectively increased, the adsorption of the styrene-butadiene-styrene block copolymer to a phase change base material is increased, the phenomenon that the styrene-butadiene-styrene block copolymer and the phase change base material are separated from each other is effectively avoided, the uniformity of the phase change material is further improved, the phase change material still has high quality conservation rate after being used at high temperature for a long time, the light weight and the compactness of a battery module can be realized, and the heat conductivity coefficient of the phase change material is improved.

The styrene-butadiene-styrene block copolymer can form a flexible supporting framework and provide good flexibility for the phase-change material; the heat conduction reinforcing agent is added, so that the heat conduction capability of the phase change material can be effectively improved, and the battery heat management is more effectively adapted. The phase-change temperature range of the high-stability thermotropic flexible phase-change material prepared by the preparation method is 45-50 ℃, the heat conductivity coefficient is high, and the problem that the material is separated from thermal contact with a battery during leakage and vibration is effectively avoided.

Preferably, the mass ratio of the phase change base material to the styrene-butadiene-styrene block copolymer to the ethylene propylene diene monomer is 8: (1-1.7): (0.3-0.7).

Preferably, the addition amount of the thermal conductivity enhancer is 3 to 5 wt% of the total mass.

Preferably, the melting temperature in S1 is 140-150 ℃, and the rotation speed for stirring and dissolving is 300-500 rad/min.

Preferably, the rotation speed of the stirring and mixing in S2 and S3 is 800-1000 rad/min.

Preferably, the phase change substrate is selected from paraffin and/or polyethylene glycol, and the thermal conductivity enhancer is selected from expanded graphite, graphene and/or carbon nanotubes.

The application also provides a cushioning battery module, which comprises a box body and a battery bracket, wherein the battery bracket is made of a phase-change material;

the battery bracket is placed in the box body and used for loading a battery;

the battery bracket comprises loading barrels and connecting pieces which connect the loading barrels in series at intervals;

the loading barrel is provided with a loading hole for the battery to stretch into, and the loading hole is in interference fit with the battery.

Preferably, the height of the loading cylinder, the height of the connecting piece and the height of the battery are the same.

Preferably, the connecting pieces are linear and are arranged at intervals along the length direction of the box body, so that the loading cylinders on the adjacent connecting pieces are spaced.

Preferably, the length of the connecting piece is matched with that of the box body.

Preferably, the thickness of the connecting piece is 3-5mm, the thickness of the loading barrels is 3-5mm, the spacing distance between the loading barrels is 7-11mm, and the spacing distance between the loading barrels on the adjacent connecting pieces is 3-5 mm.

Preferably, the number of the loading barrels connected in series on the connecting piece is 3-5.

Preferably, the battery bracket is connected with the box body through a buckle.

Preferably, the phase change material is prepared from a phase change base material, a styrene-butadiene-styrene block copolymer, ethylene propylene diene monomer and a heat conduction reinforcing agent.

Preferably, the case is made of an insulating material.

Preferably, the battery bracket is made of the thermotropic flexible phase change material with high stability prepared by the preparation method.

In summary, the application provides a cushioning battery module, which comprises a box body and a battery bracket, wherein the battery bracket is made of a phase-change material; the battery bracket is placed in the box body and used for loading a battery; the battery bracket comprises loading barrels and connecting pieces for connecting the loading barrels in series at intervals; the loading barrel is provided with a loading hole for the battery to extend into, and the loading hole is in interference fit with the battery. The loading cylinders on the battery bracket are connected in series through the connecting pieces and distributed at intervals, so that the stability of supporting the battery can be effectively improved, and the influence of vibration on the battery can be buffered; and meanwhile, secondary heat dissipation coupling with air cooling or liquid cooling is facilitated, heat dissipation optimization of the battery module is realized, and heat absorption/release efficiency is improved. The utility model provides a bradyseism battery module breaks away from the problem of thermal contact with the battery when effectively avoiding revealing and vibrations.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

FIG. 1 is a graph of the mass retention performance of the product made in the examples of this application after continuous heating;

FIG. 2 is a graph showing the results of thermal conductivity of the products obtained in the examples of the present application;

fig. 3 is a schematic structural diagram of a battery module according to an embodiment of the present disclosure;

fig. 4 is a top view of a battery module according to an embodiment of the present disclosure;

illustration of the drawings: 1. a box body; 2. a loading cartridge; 3. a loading aperture; 4. a connecting member; 5. a battery.

Detailed Description

In order to make the objects, features and advantages of the present application more obvious and understandable, the technical solutions in the embodiments of the present application are clearly and completely described, and it is obvious that the embodiments described below are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Example 1

(1) Melting paraffin at 150 ℃, adding styrene-butadiene-styrene block copolymer, stirring and dissolving at 500rad/min to obtain a semitransparent colloidal solution;

(2) and adding ethylene propylene diene monomer (ethylene, propylene and non-conjugated diene terpolymer with the molecular weight distribution of 2-5) into the semitransparent colloidal solution, stirring and melting at 1000rad/min, wherein the mass ratio of paraffin to the styrene-butadiene-styrene block copolymer to the ethylene propylene diene monomer is 8: 1: 0.5, a viscous colloidal solution is obtained;

(3) adding expanded graphite into the viscous colloidal solution, stirring and mixing at 1000rad/min, wherein the addition amounts of the thermal conductivity enhancer are respectively 1 wt%, 3 wt% and 5 wt% of the total mass, pouring into a mold for solidification, and respectively preparing products E-SPEG1, E-SPEG3 and E-SPEG 5.

Comparative example 1

Melting paraffin at 150 ℃, adding a styrene-butadiene-styrene block copolymer, stirring and dissolving at 500rad/min, wherein the mass ratio of the paraffin to the styrene-butadiene-styrene block copolymer is 8: and 1.5, pouring the mixture into a mold for curing to obtain a product SP.

Comparative example 2

(2) and adding ethylene propylene diene monomer into the semitransparent colloidal solution, and stirring and melting the ethylene propylene diene monomer at the speed of 1000rad/min, wherein the mass ratio of the paraffin to the styrene-butadiene-styrene block copolymer to the ethylene propylene diene monomer is 8: 1: 0.5 percent (the addition amount of the ethylene propylene diene monomer is 3 percent of the total mass) to obtain viscous colloidal solution, and the viscous colloidal solution is poured into a mould to be solidified to obtain the product E-SP 3. The products E-SP1 and E-SP5 are prepared by adjusting the addition amount of the ethylene propylene diene monomer to be 1 wt% and 5 wt% of the total mass by the same preparation method.

Comparative example 3

(1) Melting paraffin at 70 ℃, adding epoxy resin (polycondensate of epichlorohydrin and bisphenol A) and stirring at 500rad/min to uniformly mix the epoxy resin and the liquid paraffin;

(2) adding expanded graphite (expansion ratio: 500) into paraffin/epoxy resin, keeping at 70 ℃, and stirring at 1000rad/min, wherein the mass ratio of the paraffin to the epoxy resin to the expanded graphite is 8: 0.75: 0.5, obtaining a uniform mixed solution;

(3) adding a curing agent (polyurethane adhesive) into the uniformly mixed solution, stirring and mixing at 1000rad/min, wherein the mass of the curing agent is the same as that of the epoxy resin and accounts for 7.5 wt% of the total mass ratio, stirring for 10min, and pouring into a mold for curing to obtain a product Er-PCM.

FIG. 1 is a graph showing the results of mass retention performance after continuous heating of the product obtained in the examples of the present application, wherein the product (SP) obtained in comparative example 1 shows significant phase change component leakage after 3 hours of continuous heating at 60 ℃, and the mass retention rate is only about 95% after 10 hours of continuous heating. The product (E-SP3) prepared by the comparative example 2, which is added with the Ethylene Propylene Diene Monomer (EPDM) on the basis of the comparative example 1, has the quality retention rate of more than 99 percent after being heated for 10 hours, and meanwhile, the condition of obvious phase change component leakage does not occur. However, the product (E-SPEG5) obtained in example 1 of the present application has improved mass retention by adding Expanded Graphite (EG), and the retention after 10 hours heating reaches about 100%. In addition, the comparative example 3 product (Er-PCM) had a significantly lower mass retention (96.8%) after 10 hours of heating than the product of example 1 of the present application.

FIG. 2 is a graph showing the results of the thermal conductivity of the products obtained in examples of the present application, in which the products (SP) obtained in comparative example 1 and the products E-SP1, E-SP3 and E-SP5 of comparative example 2 added in amounts of 1 wt%, 3 wt% and 5 wt%, respectively, of the total mass all had thermal conductivities of less than 0.3W/(m.K). The thermal conductivity of the products E-SPEG1, E-SPEG3 and E-SPEG5 prepared in example 1 is distributed in a range of 0.4-1.2W/(m.K), and the thermal conductivity is obviously improved, particularly the thermal conductivity of the product E-SPEG5 is equivalent to that of the product Er-PCM prepared in comparative example 3.

Example 2

Referring to fig. 3 to 4, an embodiment of the application provides a cushioning battery 5 module, which includes a box 1 and a battery holder; the battery bracket is arranged in the box body 1 and is used for loading a battery 5; a battery holder was made from the product made in example 1.

In the embodiment of the application, the phase-change material has good flexibility, still has high quality retention rate when used at high temperature for a long time, can realize the light weight and compactness of the battery 5 module, improves the heat conductivity coefficient of the phase-change material, is more effectively suitable for the heat management of the battery 5, and avoids the problem of thermal contact separation with the battery 5 during leakage and vibration.

Further, the battery bracket comprises loading barrels 2 and connecting pieces 4 for connecting the loading barrels 2 in series at intervals; the loading barrel 2 is provided with a loading hole 3 for a battery 5 to extend into, and the loading hole 3 is in interference fit with the battery 5.

In the embodiment of the application, the loading cylinders 2 on the battery bracket are connected in series and distributed at intervals through the connecting pieces 4, so that the stability of supporting the battery 5 can be effectively improved, and the influence of vibration on the battery 5 is buffered; meanwhile, the structure design is convenient for secondary heat dissipation coupling with air cooling or liquid cooling, heat dissipation optimization of the battery 5 module is achieved, and heat absorption/release efficiency is improved.

Further, the height of the loading cylinder 2, the connector 4 and the battery 5 is the same.

In the embodiment of the application, the loading barrel 2 can stably fix the battery 5, and the connecting piece 4 can effectively disperse heat, so that the heat transfer efficiency is improved.

Furthermore, the connecting pieces 4 are linear and are arranged at intervals along the length direction of the box body 1, so that the loading cylinders 2 on the adjacent connecting pieces 4 are spaced at intervals.

In this application embodiment, under the fixed action of connecting piece 4, the stability that battery 5 loaded can be guaranteed in the interval setting of 2 loading on the adjacent connecting piece 4, the radiating effect of battery 5 module also can be improved.

Further, the length of the connecting piece 4 is matched with that of the box body 1.

In the embodiment of the application, the two ends of the connecting piece 4 just abut against the inner wall of the box body 1, the loading stability of the battery 5 is improved, and the thermal contact with the battery 5 is avoided during vibration.

Furthermore, the thickness of the connecting piece 4 is 3mm, the thickness of the loading barrels 2 is 5mm, the spacing distance of the loading barrels 2 is 5mm, and the spacing distance of the loading barrels 2 on the adjacent connecting pieces 4 is 11 mm.

In the embodiment of the application, the structural design can meet the heat dissipation requirement and the heat conduction performance of the battery 5 module, and the space can be fully utilized to realize the effects of stability and leakage prevention.

Furthermore, the number of the loading barrels 2 connected in series on the connecting piece 4 is 3.

In the embodiment of the application, the number of the loading cylinders 2 connected in series on the connecting piece 4 is not too large, which can cause the unstable assembly structure and easily cause the dislocation and the thermal contact separation of the loading cylinders 2.

Further, the battery bracket is connected with the box body 1 through a buckle.

In this application embodiment, the buckle can be established to battery holder's bottom, is connected with the spacing groove block of box 1 bottom, promotes battery 5's fixed action.

Further, the case 1 is made of an insulating material.

The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims

1. A bradyseism battery module is characterized by comprising a box body and a battery bracket, wherein the battery bracket is made of a phase-change material;

the battery bracket is placed in the box body and used for loading a battery;

2. The cushioning battery module of claim 1, wherein the loading cylinder, the connector, and the battery are the same height.

3. The cushioning battery module of claim 1, wherein the connectors are linear and are spaced apart along the length of the box to space the loading tubes on adjacent connectors.

4. The cushioning battery module of claim 1, wherein the length of the connector is adapted to the tank.

5. The cushioning battery module of claim 1, wherein the connecting members are 3-5mm thick, the loading cylinders are 7-11mm apart, and the loading cylinders on adjacent connecting members are 3-5mm apart.

6. The cushioning battery module of claim 1, wherein the number of the loading barrels connected in series on the connecting member is 3-5.

7. The cushioning battery module of claim 1, wherein the battery support is connected to the box by a snap fit.

8. The cushioning battery module of claim 1, wherein the case is made of an insulating material.