External thermal insulation structure of power battery box body

Abstract

The utility model relates to the technical field of power battery heat preservation, and particularly discloses an external heat preservation structure of a power battery box body, which comprises a battery box body, an upper cover plate is arranged outside the battery box body, the upper cover plate is of a U-shaped structure, a first heat insulation layer is arranged on the inner wall of the upper cover plate, and the first heat insulation layer is in contact with the outside of the battery box body; a lower cover plate is arranged below the battery box body, and the bottom of the upper cover plate is connected with the lower cover plate; a second heat insulating layer is arranged on the upper surface of the lower cover plate and is in contact with the lower surface of the battery box body; a wiring panel is further arranged at the wiring end of the battery box body, a third heat insulation layer is arranged on the inner side of the wiring panel, and the third heat insulation layer is in contact with the wiring end of the battery box body. Heat preservation is effectively provided for the power battery, attenuation of the low temperature to the battery is effectively reduced, the available electricity consumption of the battery is improved, meanwhile, direct cold start at the low temperature can be achieved, the start time is shortened, and energy is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of power battery thermal insulation, in particular to an external thermal insulation structure for a power battery box body. Background Art

[0002] With the rapid development of new energy vehicle technology, commercial trucks, as an important tool for logistics transportation, are accelerating their electrification process. Lithium iron phosphate power batteries have been widely used in the field of commercial trucks due to their high safety, long life, and low cost. However, with the gradual popularization and application of lithium iron phosphate power batteries, the performance attenuation problem of lithium iron phosphate power batteries in low-temperature environments has become a bottleneck restricting their winter use efficiency.

[0003] In particularly cold regions, the winter temperature is generally below -25°C, which results in a practical power consumption attenuation of lithium iron phosphate power batteries of more than 40%. The significant attenuation of battery power not only affects the driving range of commercial trucks but also increases operating costs and uncertainties. In addition, after the battery is parked outdoors overnight at low temperature, the battery temperature will quickly drop below zero. At this time, it is necessary to insert a charging gun and heat it above zero through the battery heating system to discharge and drive normally. This not only increases the operation complexity, increases energy consumption, but also reduces operating efficiency.

[0004] Therefore, there are obvious deficiencies in the thermal insulation of existing commercial truck power batteries. In order to avoid too low outdoor temperature of the battery, simple thermal insulation measures are often adopted, such as only covering with cotton quilts. This method is not only insecure, easy to fall off and the coverage is incomplete, but also has poor thermal insulation performance, inconvenient to carry and low versatility. Such simple thermal insulation measures cannot effectively solve the problem of performance attenuation of power batteries in low-temperature environments in winter, nor can they avoid the problem that the power battery temperature quickly drops below 0°C during short-term stops, resulting in inability to directly cold start.

[0005] Therefore, in order to solve the problems such as serious attenuation of power batteries in low-temperature environments and inability to directly cold start, there is a need to provide a reliable external thermal insulation structure for power battery boxes. Summary of the Utility Model

[0006] The purpose of the utility model is to provide an external thermal insulation structure for a power battery box body to provide reliable thermal insulation for the power battery box body, reduce the power attenuation of the power battery, increase the available power of the battery, and avoid the situation that additional heating treatment is required before starting when the temperature of the power battery is too low, reduce energy consumption, and shorten the waiting time at the same time.

[0007] To achieve the above purpose, the utility model adopts the following technical solutions:

[0008] This utility model is mainly used to provide reliable thermal insulation for the power battery box body, reduce battery attenuation, extend the service life of the battery, and avoid additional heating before startup. Specifically, it provides an external thermal insulation structure for the power battery box body, including a battery box body. An upper cover plate is provided outside the battery box body. The upper cover plate is of a U-shaped structure. A first heat insulation layer is provided on the inner wall of the upper cover plate, and the first heat insulation layer is in contact with the outside of the battery box body. A lower cover plate is provided below the battery box body, and the bottom of the upper cover plate is connected to the lower cover plate. A second heat insulation layer is provided on the upper surface of the lower cover plate, and the second heat insulation layer is in contact with the lower surface of the battery box body. A wiring panel is also provided at the wiring end of the battery box body, and a third heat insulation layer is provided inside the wiring panel, and the third heat insulation layer is in contact with the wiring end of the battery box body.

[0009] The principle and advantages of this solution are as follows:

[0010] When power batteries are used in most regions, they generate heat by themselves, and the general ambient temperature is not too cold to seriously affect the use of power batteries. Therefore, generally, the heat dissipation performance of power batteries is considered, rather than the battery thermal insulation performance. However, it is overlooked that with the expansion of the application environment, when power batteries are used in low-temperature environments, especially before the power batteries are started, they are placed in a completely static state. In extremely low-temperature situations, it will cause serious battery attenuation problems, and in areas with relatively low temperatures, the temperature will be too low to start, and additional heating is required before starting, which increases energy consumption and also prolongs the waiting time. The existing thermal insulation methods often use cotton quilts for thermal insulation treatment. This thermal insulation method is not standardized, inconvenient to operate, difficult to carry, and has low versatility.

[0011] Therefore, this solution uses a simple and convenient upper cover plate and lower cover plate in cooperation to tightly seal and wrap the power battery on all sides, forming a relatively closed thermal insulation space, and uses a heat insulation layer to insulate the battery box body, reducing low-temperature attenuation. At the same time, this solution has the following advantages:

[0012] 1. Achieve the thermal insulation effect, so that the battery can also reach above zero degrees after long-term parking, realize cold start, no longer require additional heating treatment, reduce waiting time, save energy loss, and improve operation efficiency.

[0013] 2. The thermal insulation structure is simple, light, reliable, and safe to operate. The operation is more standardized and convenient, improving versatility and practicality.

[0014] 3. Effectively reduce the attenuation of the battery caused by low temperature, improve the available power of the battery, and extend the service life of the battery. Description of the Drawings

[0015] Figure 1 Structural schematic diagram of an external thermal insulation structure for a power battery box body of the present utility model;

[0016] Figure 2 Exploded structural schematic diagram of an external thermal insulation structure for a power battery box body of the present utility model;

[0017] Figure 3 Cross-sectional structural schematic diagram of a fixing groove of an external thermal insulation structure for a power battery box body of the present utility model;

[0018] Figure 4 Structural schematic diagram of a fixing bracket of an external thermal insulation structure for a power battery box body of the present utility model. Specific embodiments

[0019] The following is a further detailed description through specific embodiments:

[0020] Reference numerals in the accompanying drawings of the specification include: battery box body 1, upper cover plate 2, first heat insulation layer 3, lower cover plate 4, second heat insulation layer 5, clamping plate 6, fixing groove 7, positioning hole 8, fixing bracket 9, support piece 91, connecting hole channel 92, wiring terminal 10, wiring panel 11, third heat insulation layer 12.

[0021] The embodiment is basically as shown in the attached Figure 1 figure: An external thermal insulation structure for a power battery box body, including a battery box body 1 with an overall rectangular parallelepiped structure, and an upper cover plate 2 is installed on the outside of the battery box body 1 through bolts. As shown in the attached Figure 2 figure, the upper cover plate 2 has an overall U-shaped structure, and the upper cover plate 2 is buckled on the upper part of the battery box body 1 to cover the battery box body 1 inside it. A first heat insulation layer 3 is pasted on the inner wall of the upper cover plate 2. After installation, the first heat insulation layer 3 contacts the outside of the battery box body 1, so as to thermally insulate the upper part of the battery box body 1 through the first heat insulation layer 3.

[0022] At the same time, a lower cover plate 4 is installed under the battery box body 1 through bolts, and the bottom of the upper cover plate 2 and the lower cover plate 4 are detachably connected through bolts. A second heat insulation layer 5 is pasted on the upper surface of the lower cover plate 4, and the second heat insulation layer 5 contacts the lower surface of the battery box body 1 to thermally insulate the bottom of the battery box body 1 through the second heat insulation layer 5. The upper cover plate 2 and the lower cover plate 4 are used to cover the four sides of the battery box body 1, and a reliable closed heat insulation space is formed through the first heat insulation layer 3 and the second heat insulation layer 5 to ensure the heat insulation performance.

[0023] In this embodiment, a wiring panel 11 is further provided at the wiring terminal 10 of the battery box body 1, and a third heat insulation layer 12 is pasted on the inner side of the wiring panel 11 to make the third heat insulation layer 12 contact the wiring terminal 10 of the battery box body 1, so as to form a closed heat insulation space.

[0024] In this embodiment, the thicknesses of the first heat insulation layer 3, the second heat insulation layer 5, and the third heat insulation layer 12 are set to 5 mm, and all of them are made of aerogel fireproof heat insulation material layers with a thermal conductivity of 0.02 W / m·K. They are pasted at corresponding positions on the cover plate through 3M glue to ensure the heat insulation performance, provide heat preservation for the power battery, and reduce low-temperature attenuation.

[0025] In this embodiment, the upper cover plate 2, the lower cover plate 4, and the wiring panel 11 are all made of aluminum plate structures with a thickness of 2 mm, which can meet the stiffness requirements of large shell parts while reducing the weight of the cover plate to meet the lightweight requirements.

[0026] Specifically, a clamping plate 6 with a rectangular structure is integrally formed and extends outward at the bottom of the upper cover plate 2. A plurality of fixing grooves 7 are spaced apart on the clamping plate 6, which facilitates the installation and positioning of bolts. In this embodiment, the fixing grooves 7 are square structures, and the positions of the fixing grooves 7 correspond to the positions of the mounting holes of the battery box body 1, ensuring convenient installation and use.

[0027] Correspondingly, a plurality of positioning holes 8 are provided on the outer periphery of the lower cover plate 4. Among them, the positions and quantities of the positioning holes 8 are arranged opposite to the fixing grooves 7. The upper cover plate 2 is fixedly installed on the lower cover plate 4 through the cooperation of the fixing grooves 7 and the positioning holes 8, thereby forming a closed heat preservation space.

[0028] In this embodiment, as shown in the appendix Figure 3 At most one fixing bracket 9 is further provided on the fixing groove 7. Since both the upper cover plate 2 and the lower cover plate 4 are made of aluminum plate structures and have a relatively thin thickness, during installation, the upper cover plate 2 and the lower cover plate 4 can be effectively fixed by using the fixing bracket 9. Therefore, it is not necessary to install a fixing bracket 9 in each fixing groove 7 to reduce the installation structure and avoid deformation of the upper cover plate 2 and the lower cover plate 4 caused by excessive extrusion, which affects the heat preservation performance. For the fixing grooves 7 that do not require the installation of the fixing bracket 9, they are directly connected to the mounting holes of the power battery through bolts and nuts, leaving corresponding gaps.

[0029] In this embodiment, as shown in the appendix Figure 4 As shown, the fixing bracket 9 includes a support piece 91. During installation, the support piece 91 is installed on the fixing groove 7. A connecting hole channel 92 that protrudes downward is provided in the middle of the support piece 91, and the connecting hole channel 92 is arranged in the fixing groove 7 to facilitate the fixed installation of the bolt.

[0030] In this embodiment, the key to the thermal insulation structure is that except for the wiring and water pipe positions of the power battery, all other exposed surfaces are tightly wrapped with heat insulation materials. The heat insulation materials are pasted on the inner wall of the aluminum plate cover. After installation, the heat insulation materials are completely fitted and sealed tightly with the power battery. The reliability is ensured through the cover, and the effects of sun protection, waterproofing, and anti-aging can be achieved. At the same time, the structure is more firm and the use is more convenient through this installation method, effectively achieving the thermal insulation effect, improving the versatility and practicability of the thermal insulation structure, and also ensuring the use safety.

[0031] The above are only the embodiments of the present utility model. Specific technical solutions and / or common knowledge such as characteristics well known in the art are not described in detail herein. It should be noted that for those skilled in the art, without departing from the technical solution of the present utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the present utility model, and these will not affect the implementation effect of the present utility model and the practicability of the patent. The protection scope required by this application should be subject to the content of its claims, and the specific implementation manners described in the specification can be used to explain the content of the claims.

Claims

1. An external thermal insulation structure for a power battery box, characterized in that: It includes a battery box body, and an upper cover plate is provided outside the battery box body. The upper cover plate is of a U-shaped structure, and a first heat insulation layer is provided on the inner wall of the upper cover plate. The first heat insulation layer is in contact with the outside of the battery box body; a lower cover plate is provided below the battery box body, and the bottom of the upper cover plate is connected to the lower cover plate; a second heat insulation layer is provided on the upper surface of the lower cover plate. The second heat insulation layer is in contact with the lower surface of the battery box body; a wiring panel is also provided at the wiring terminal of the battery box body, and a third heat insulation layer is provided inside the wiring panel. The third heat insulation layer is in contact with the wiring terminal of the battery box body; the thermal conductivities of the first heat insulation layer, the second heat insulation layer and the third heat insulation layer are all 0.02 W / m·K.

2. The external thermal insulation structure of a power battery box according to claim 1, characterized in that: Both the upper cover plate and the lower cover plate are of aluminum plate structure, and the thicknesses of the upper cover plate and the lower cover plate are both 2 mm.

3. The external thermal insulation structure of a power battery box according to claim 1, characterized in that: A plurality of fixing grooves are provided at the bottom of the upper cover plate, and the fixing grooves are correspondingly arranged with the mounting holes of the battery box body.

4. The external thermal insulation structure of a power battery box according to claim 3, characterized in that: A plurality of positioning holes are provided on the lower cover plate, and the positioning holes are correspondingly arranged with the fixing grooves.

5. The external thermal insulation structure of a power battery box according to claim 3, characterized in that: At most one fixing bracket is provided on the fixing groove.

6. The external thermal insulation structure of a power battery box according to claim 5, wherein: The fixing bracket includes a support piece, the support piece is provided on the fixing groove, and a downwardly protruding connecting hole is provided in the middle of the support piece. The connecting hole is provided in the fixing groove.

7. The external thermal insulation structure of a power battery box according to claim 1, characterized in that: The thicknesses of the first heat insulation layer, the second heat insulation layer and the third heat insulation layer are all 5 mm.

8. The external thermal insulation structure of a power battery box according to claim 1, characterized in that: The first heat insulation layer, the second heat insulation layer and the third heat insulation layer are all adhesively arranged by 3M glue.

9. The external thermal insulation structure of a power battery box according to claim 1, characterized in that: The first heat insulation layer, the second heat insulation layer and the third heat insulation layer are all aerogel fireproof heat insulation material layers.

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