阅读说明：本技术 一种动力电池被动保温系统 (Passive heat preservation system of power battery ) 是由 王志强 于 2021-07-29 设计创作，主要内容包括：一种动力电池被动保温系统,所述动力电池包括包括多个电芯组成的模组以及包裹所述模组的箱体,所述箱体包括上箱体与下箱体,所述下箱体包括上下叠置的冷却板与底护板,其特征在于,所述动力电池被动保温系统包括被动保温结构,所述被动保温结构包括冷却板底部隔热结构、设于箱体两侧内部的侧部保温结构、设于上箱体的上箱体保温层、设于箱体底护板下表面的底护板保温结构。本发明提供的动力电池被动保温系统,能在不损耗或低损耗电池能量的情况下保持电池温度,降低电芯温度降低速度。(The utility model provides a passive heat preservation system of power battery, power battery includes module and the parcel that a plurality of electric cores are constituteed the box of module, the box includes box and lower box, the box includes the cooling plate and the end backplate of superpose from top to bottom down, a serial communication port, the passive heat preservation system of power battery is including passive insulation construction, passive insulation construction includes the cooling plate bottom thermal-insulated structure, locates the inside lateral part insulation construction in box both sides, locates the last box heat preservation of last box, locates the end backplate insulation construction of backplate lower surface at the bottom of the box. The passive heat preservation system for the power battery provided by the invention can keep the temperature of the battery under the condition of no loss or low loss of battery energy, and reduce the speed of reducing the temperature of the battery core.)

1. The utility model provides a passive heat preservation system of power battery, power battery includes module and the parcel that a plurality of electric cores are constituteed the box of module, the box includes box and lower box, the box includes the cooling plate and the end backplate of superpose from top to bottom down, a serial communication port, the passive heat preservation system of power battery is including passive insulation construction, passive insulation construction includes the cooling plate bottom thermal-insulated structure, locates the inside lateral part insulation construction in box both sides, locates the last box heat preservation of last box, locates the end backplate insulation construction of backplate lower surface at the bottom of the box.

2. The passive thermal insulation system for power batteries according to claim 1, wherein the thermal insulation structure at the bottom of the cooling plate is EPP foam adhered to the bottom of the cooling plate.

3. The passive thermal insulation system for power batteries according to claim 1, wherein the lateral thermal insulation structure is melamine adhered to the inner portions of two sides of the box body.

4. The passive thermal insulation system for power batteries according to claim 1, wherein the upper box thermal insulation layer is compounded on the inner layer of the upper box.

5. The passive thermal insulation system for power batteries according to claim 1, wherein the bottom protection plate thermal insulation structure is a PVC layer sprayed on the lower surface of the bottom protection plate of the box body.

6. The passive thermal insulation system for power batteries according to claim 1, further comprising a thermal insulating gasket disposed between the end plate of the module and the case at the fixing bolt.

7. The passive heat preservation system for power batteries according to claim 1, wherein the lower box further comprises edge beams fixed to both sides of the bottom guard plate, and the passive heat preservation system for power batteries further comprises edge beam heat preservation structures arranged outside the edge beams on both sides of the box.

8. The passive thermal insulation system for power batteries according to claim 7, wherein the edge beam thermal insulation structure is a PVC layer sprayed on the outer portions of the edge beams on both sides of the box body.

9. The passive thermal insulation system for power batteries according to claim 7, further comprising a blocking structure for blocking the cavity of the boundary beam.

10. The passive thermal insulation system for the power battery according to claim 1, further comprising a weather strip arranged above the upper box body so as to form an independent closed space between the top of the power battery and the floor of the vehicle body.

Technical Field

The invention relates to the technical field of new energy, in particular to a passive heat preservation system for a power battery.

Background

The highest winter parking temperature of northeast and Beijing areas is lower than 25 ℃, and the lowest temperature of partial vehicles can reach-20 ℃ when being started. Therefore, the heat preservation of the power battery is urgently needed.

Many of the existing power battery schemes are not insulated due to the limitations of energy density and arrangement space. The power assembly without the heat preservation design can reduce the discharge energy and the discharge power of the power battery, so that the driving range of the whole vehicle in winter is influenced.

The existing power battery adopts an active heat preservation design, namely, the battery is heated by heating cooling liquid through the electric quantity of the battery. This method causes battery energy loss and the thermal conditions are limited by the PTC heat transfer energy.

Therefore, how to maintain the battery temperature without loss or low-loss battery energy and reduce the cell temperature reduction speed is an urgent problem to be solved for power batteries.

The foregoing description is provided for general background information and is not admitted to be prior art.

Disclosure of Invention

The invention aims to provide a passive heat preservation system for a power battery, which can keep the temperature of the battery under the condition of no loss or low loss of battery energy and reduce the speed of reducing the temperature of a battery core.

The invention provides a power battery passive heat insulation system, wherein a power battery comprises a module consisting of a plurality of electric cores and a box body wrapping the module, the box body comprises an upper box body and a lower box body, the lower box body comprises a cooling plate and a bottom protection plate which are superposed up and down, the power battery passive heat insulation system comprises a passive heat insulation structure, and the passive heat insulation structure comprises a cooling plate bottom heat insulation structure, side heat insulation structures arranged inside two sides of the box body, an upper box body heat insulation layer arranged on the upper box body and a bottom protection plate heat insulation structure arranged on the lower surface of the bottom protection plate of the box body.

Further, the heat insulation structure at the bottom of the cooling plate is EPP foam adhered to the bottom of the cooling plate.

Further, the lateral heat-insulating structure is melamine adhered to the inner parts of two sides of the box body.

Furthermore, the upper box body heat-insulating layer is compounded on the inner layer of the upper box body.

Further, the bottom protection plate heat insulation structure is a PVC layer sprayed on the lower surface of the bottom protection plate of the box body.

Further, still include the heat insulating gasket that sets up at fixing bolt department between the end plate of module and the box.

Furthermore, the lower box body further comprises boundary beams fixed on two sides of the bottom protection plate, the power battery passive heat insulation system further comprises a boundary beam heat insulation structure, and the power battery passive heat insulation system further comprises boundary beam heat insulation structures arranged outside the boundary beams on two sides of the box body.

Furthermore, the boundary beam heat-insulating structure is a PVC layer sprayed on the outer portions of the boundary beams on the two sides of the box body.

Furthermore, the device also comprises a blocking structure for blocking the boundary beam cavity.

Furthermore, the wind shielding device also comprises a wind shielding strip which is arranged above the upper box body and is used for forming an independent closed space between the top of the power battery and the floor of the vehicle body.

According to the passive heat insulation system for the power battery, provided by the invention, the battery temperature can be kept under the condition of no loss or low loss of battery energy by arranging various passive heat insulation structures, and the speed of reducing the battery core temperature is reduced.

Drawings

Fig. 1 is a schematic cross-sectional view of a passive thermal insulation system for a power battery according to an embodiment of the invention.

Fig. 2 is an exploded perspective view of the passive thermal insulation system for power batteries shown in fig. 1.

Fig. 3 is a schematic diagram of a heat insulation structure at the bottom of a cooling plate in the passive heat insulation system for power batteries shown in fig. 1.

Fig. 4 is a schematic view of a module and a heat insulation spacer in the passive thermal insulation system for power battery shown in fig. 1.

Fig. 5 is a schematic diagram of a box body and a side heat preservation structure in the power battery passive heat preservation system shown in fig. 1.

Fig. 6 is a schematic diagram of an upper box body and an upper box body heat insulation layer in the power battery passive heat insulation system shown in fig. 1.

Fig. 7 is a schematic view of the heat insulation structure of the bottom guard plate and the bottom guard plate in the passive heat insulation system for power battery shown in fig. 1.

Fig. 8 is a schematic view of an edge beam and a plugging structure in the passive thermal insulation system for power batteries shown in fig. 1.

Fig. 9 is a schematic view of an upper box body and a weather strip in the passive heat preservation system for power batteries shown in fig. 1.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

As shown in fig. 1 and fig. 2, a passive thermal insulation system for a power battery according to an embodiment of the present invention is used for insulating the power battery 1. The power battery 1 comprises a module 11 consisting of a plurality of battery cells and a box body (not marked) wrapping the module 11, wherein the box body consists of an upper box body 12 and a lower box body 13. The lower case 13 includes a cooling plate 131, a bottom cover 132, and edge beams 133 fixed to both sides of the bottom cover 132. The lower case 13 is fixed to the upper case 12 by the side beam 133.

In this embodiment, the passive heat preservation system of power battery includes and prevents that external heat from passing to power battery assembly inside when being used for blocking the inside heat transfer route high temperature of power battery, and the heat is difficult to transmit the passive insulation structure to the external environment during the low temperature. In this embodiment, the passive heat insulation structure includes a cooling plate bottom heat insulation structure 2 (as shown in fig. 3), a heat insulation gasket 3 (as shown in fig. 4) disposed between an end plate (not shown) of the module 11 and the box body at the position of the fixing bolt 111, a lateral heat insulation structure (as shown in fig. 5) disposed inside two sides of the box body, an upper box body heat insulation layer 4 (as shown in fig. 6) disposed on the upper box body 12, a bottom protection plate heat insulation structure (as shown in fig. 7) disposed on a lower surface of the bottom protection plate 132, the bottom protection plate heat insulation structure being sprayed on the dashed frame area, an edge beam heat insulation structure (not shown) disposed outside edge beams at two sides of the box body, a blocking structure 5 (as shown in fig. 8) blocking the edge beam cavity, and a wind shielding strip 6 (as shown in fig. 9) disposed above the upper box body 12 for forming an independent closed space between the top of the power battery 1 and a floor (not shown) of the vehicle body.

As shown in fig. 3, the heat insulation structure 2 at the bottom of the cooling plate is used for blocking the downward heat transfer. Since the module 11 or the cell is usually adhered to the cooling plate 131 in the form of glue, the heat conducting layer between the cooling plate 131 and the module 11 or the cell is very important for heat dissipation and heating. Therefore, the cooling plate bottom heat insulation structure 2 provided at the bottom of the cooling plate 131 can effectively prevent heat from being dissipated. In this embodiment, the cooling plate bottom heat insulating structure 2 is EPP (expanded polypropylene) foam adhered to the bottom of the cooling plate 131, and has a material thickness of 3mm or more.

As shown in fig. 4, the heat insulating gasket 3 provided between the end plate of the module 11 and the case at the fixing bolt 111 transfers heat through the fixing position with respect to the heat at the fixing position of the module. In this embodiment, the thickness of the heat insulating spacer 3 is 1 mm.

As shown in fig. 5, the side heat-insulating structure is used for heat convection between the air around the module 11 and the box and the module 11. In this embodiment, the side heat-insulating structure is melamine adhered to the inside of the two sides of the box body, and the thickness of the material needs to match the distance between the box body boundary beam 133 and the module 11.

As shown in fig. 6, the upper tank insulating layer 4 is a heat convection layer that is generated in a gap between the upper portion of the module 11 and the upper tank 12. In this embodiment, the upper box heat-insulating layer 4 is directly combined (by bonding or bolt fixing) to the inner layer of the upper box 12, so that the assembly is convenient and the assembly efficiency is improved. The upper box insulating layer 4 needs to be matched with the upper box 12 in structure, and can adopt basically the same shape, but has a slightly smaller size.

As shown in fig. 7, in this embodiment, the bottom protection plate heat preservation structure is sprayed on the lower surface of the bottom protection plate of the box body (although other fixing methods can be adopted, the spraying process is simple, the material is thin, and the effect is good), and the material can be a PVC (polyvinyl chloride) layer, which can be used for heat preservation and also can be used for preventing ball impact and collision. In the present embodiment, the thermal conductivity of PVC can be reduced to 0.06-0.08W/(m.K) (generally about 0.2) when the coating is sprayed with foamed PVC to prevent ball impact.

The material and the fixing mode of the boundary beam heat-insulating structure can also adopt the same material as the bottom guard plate heat-insulating structure, namely PVC layers sprayed on the outer parts of the boundary beams at the two sides of the box body.

As shown in fig. 8, the blocking structure 5 for blocking the cavity of the edge beam 133 is used for the heat convection between the box body and the air caused by the leakage of the cavity outside the edge beam 133. Because current power battery box is mostly the aluminium alloy, inside is the cavity structure. The cavity outside the boundary beam 133 leaks outwards, which may cause convection heat exchange between the box body and the air, and affect the heat exchange of the box body. In this embodiment, the cavity of the boundary beam 133 is blocked, so that the heat convection between the air and the box body can be blocked.

As shown in fig. 9, the weather strip 6 is a heat exchange generated in the gap between the top of the power battery 1 and the bottom of the vehicle body. Due to the presence of this gap, air is free to circulate, which would intensify the heat exchange between the air and the power cell. In the embodiment, the wind shielding strip 6 is arranged above the upper box body 12, so that the top of the power battery 1 and the floor of the vehicle body form an independent closed cavity, and the convection heat exchange of air in the area can be effectively avoided.

The bottom heat insulation structure of the cooling plate, the heat insulation gasket arranged between the end plate and the box body at the position of the fixing bolt, the side heat insulation structures arranged inside two sides of the box body and the upper box body heat insulation layer compounded on the upper box body belong to internal heat insulation. The bottom protection plate heat preservation structure sprayed on the lower surface of the bottom protection plate of the box body, the boundary beam heat preservation structure sprayed on the outer portions of the boundary beams on the two sides of the box body, the blocking structure for blocking the cavity of the boundary beam, and the wind shielding strip arranged above the upper box body and used for enabling an independent closed space to be formed between the top of the power battery and the floor of the vehicle body belong to external heat preservation.

All the passive heat preservation structures are combined together, each heat transfer path in the power battery can be blocked, external heat is prevented from being transferred to the interior of the power battery assembly at high temperature, heat is difficult to be transferred to the external environment at low temperature, the optimal heat preservation effect is achieved under the condition of no loss or low loss of battery energy, the battery temperature can be remarkably kept, and the reduction speed of the battery core temperature is reduced.

In other embodiments, only part of the specific heat insulation structure can be adopted to block part of the heat transfer path according to requirements. Including only cooling plate bottom thermal insulation structure, lateral part insulation construction, last box heat preservation, end backplate insulation construction for example, can block the faster route of part heat transfer like this, also can realize heat retaining effect equally to can reduce the material when realizing the heat preservation effect of preferred, reduce cost promotes processing and assembly efficiency.

According to the trend of heat transfer, the temperature of the battery core, which is close to the edge of the box body, around the power battery is cooled at a high speed, and the temperature is a low-temperature region. The core temperature reduction rate at the middle position of the power battery is relatively slow, and the core temperature reduction rate is a high-temperature region. Therefore, the passive heat insulation structure in the low-temperature area, such as the side heat insulation structure, can realize heat insulation, and can block the heat transfer path of the low-temperature area, thereby reducing the temperature difference between the electric cores in the cooling process.

In this document, the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "vertical", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for the purpose of clarity and convenience of description of the technical solutions, and thus, should not be construed as limiting the present invention.

As used herein, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, including not only those elements listed, but also other elements not expressly listed.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.