Labyrinth type battery box sealing and heat preservation structure, battery box, system and mobile power supply

Abstract

The invention discloses a labyrinth type battery box sealing and heat preservation structure, a battery box, a system and a mobile power supply. The labyrinth type battery box sealing and heat preservation structure is arranged at the joint of a box body and a box cover of a battery box or a battery management system and comprises at least one circuitous channel, and the circuitous channel comprises narrow sections and cavity sections which are alternately distributed in the length extension direction of the circuitous channel and are communicated with each other; the depth delta of the narrow section is smaller than the depth h of the cavity section. The labyrinth type battery box sealing and heat preservation structure provided by the embodiment of the invention is arranged at the joint of the box body and the box cover or the BMS, heat dissipation can be effectively delayed, a heat flow circuitous path is increased, a local heat preservation layer is formed, the overall heat preservation effect is improved, and stable performance of single batteries such as lithium batteries in a low-temperature environment is ensured.

Description

Technical Field

[0001] The present invention particularly relates to a labyrinth-type battery box sealing and heat-insulating structure, a battery box, a system and a mobile power source, and belongs to the technical field of battery heat-insulating technology. Background Art

[0002] Lithium batteries will experience performance degradation or even malfunction at low temperatures, so they need to be insulated when the outside temperature is low. Carbon fiber composites can have good thermal insulation properties, but in a non-fully sealed state, heat will escape from the connection between the battery box body and the box cover and the BMS, resulting in the thermal insulation effect not meeting expectations. Summary of the invention

[0003] The main purpose of the present invention is to provide a labyrinth-type battery box sealing and insulation structure, a battery box, a system and a mobile power supply to improve the insulation effect of the battery box in a non-completely sealed state, thereby achieving the normal use of lithium batteries in a low temperature environment.

[0004] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention includes: A first aspect of an embodiment of the present invention provides a labyrinth-type battery box sealing and heat-insulating structure, wherein the labyrinth-type battery box sealing and heat-insulating structure is arranged at the connection between a battery box body and a box cover or a battery management system, wherein the labyrinth-type battery box sealing and heat-insulating structure comprises at least one circuitous channel, wherein the circuitous channel comprises narrow sections and cavity sections that are alternately distributed and connected along the length extension direction thereof, wherein the depth δ of the narrow section is less than the depth h of the cavity section; When the airflow entering the detour channel flows through the narrow section, due to local resistance, the pressure and temperature of the airflow decrease and the speed increases. After the airflow flows from the narrow section into the cavity section, due to the sudden expansion of the flow area, the airflow forms a strong vortex in the cavity section, the speed almost completely disappears, the kinetic energy is converted into heat, and isobaric expansion occurs in the cavity section. The temperature of the airflow rises back to a level close to that before flowing into the narrow section. When the airflow passes through multiple narrow sections and cavity sections, the pressure is gradually reduced to close to the back pressure, so that the airflow cannot flow out, thereby achieving a gas sealing state.

[0005] A second aspect of an embodiment of the present invention provides a battery box having the labyrinth-type battery box sealing and heat-insulating structure.

[0006] A third aspect of an embodiment of the present invention provides a battery system, which includes: the battery box as described above, and a battery module, wherein the battery module is packaged in the battery box.

[0007] A fourth aspect of the embodiments of the present invention provides a mobile power source, which includes: the battery box described above, or the battery system described above.

[0008] Compared with the prior art, the advantages of the present invention include: a labyrinth-type battery box sealing and insulation structure provided in an embodiment of the present invention is arranged at the connection between the box body and the box cover or the BMS, which can effectively delay heat dissipation, increase the circuitous path of heat flow, form a local insulation layer, and improve the overall insulation effect, thereby ensuring the stable performance of battery cells such as lithium batteries in low temperature environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural schematic diagram of a labyrinth-type battery box sealing and heat preservation structure provided in a typical implementation case of the present invention; Figure 2 It is a schematic diagram of the heat preservation principle of a labyrinth-type battery box sealing and heat preservation structure provided in a typical implementation case of the present invention; Figure 3 It is a structural schematic diagram of a labyrinth-type battery box sealing and insulation structure provided in a typical implementation case of the present invention. DETAILED DESCRIPTION

[0010] In view of the deficiencies in the prior art, after long-term research and extensive practice, the technical solution of the present invention is proposed. The technical solution, its implementation process and principle are further explained as follows.

[0011] A first aspect of an embodiment of the present invention provides a labyrinth-type battery box sealing and heat-insulating structure, wherein the labyrinth-type battery box sealing and heat-insulating structure is arranged at the connection between a battery box body and a box cover or a battery management system, wherein the labyrinth-type battery box sealing and heat-insulating structure comprises at least one circuitous channel, wherein the circuitous channel comprises narrow sections and cavity sections that are alternately distributed and connected along the length extension direction thereof, wherein the depth δ of the narrow section is less than the depth h of the cavity section; When the airflow entering the detour channel flows through the narrow section, due to local resistance, the pressure and temperature of the airflow decrease and the speed increases. After the airflow flows from the narrow section into the cavity section, due to the sudden expansion of the flow area, the airflow forms a strong vortex in the cavity section, the speed almost completely disappears, the kinetic energy is converted into heat, and isobaric expansion occurs in the cavity section. The temperature of the airflow rises back to a level close to that before flowing into the narrow section. When the airflow passes through multiple narrow sections and cavity sections, the pressure is gradually reduced to close to the back pressure, so that the airflow cannot flow out, thereby achieving a gas sealing state.

[0012] Furthermore, the depth h of the cavity segment is greater than the length s of the cavity segment, and the ratio of the depth δ of the narrow segment, the length n of the narrow segment, and the length s of the cavity segment is (0.1-0.5): (0.5-2): (0.9-2.7).

[0013] Furthermore, the depth δ of the narrow section is 0.1 mm-0.5 mm, the length n of the narrow section is 0.5 mm-2 mm, and the length s of the cavity section is 0.9 mm-2.7 mm.

[0014] Furthermore, the labyrinth-type battery box sealing and insulation structure is arranged between a first working surface and a second working surface, the first working surface is located on the box body of the battery box, and the second working surface is located on the box cover or the battery management system, one of the first working surface and the second working surface is a continuous plane, and the other has a plurality of convex teeth arranged at intervals, and the narrow section is correspondingly arranged between the convex teeth and the first working surface or the second working surface.

[0015] Furthermore, the ratio of the tooth pitch m between the plurality of convex teeth to the length s of the cavity segment is (1-4): (0.9-2.7), and the length of the convex teeth is equal to the length n of the narrow segment.

[0016] Furthermore, the tooth pitch m between the plurality of convex teeth is 1 mm-4 mm.

[0017] A second aspect of an embodiment of the present invention provides a battery box having the labyrinth-type battery box sealing and heat-insulating structure.

[0018] A third aspect of an embodiment of the present invention provides a battery system, which includes: the battery box and a battery module, wherein the battery module is packaged in the battery box.

[0019] A fourth aspect of the embodiments of the present invention provides a mobile power source, which includes: the battery box described above, or the battery system described above.

[0020] The technical solution, its implementation process and principle will be further explained below in conjunction with the accompanying drawings and specific implementation cases.

[0021] In a more specific implementation, see Figure 1-Figure 3 A battery system includes a box body 10, a box cover 20, a battery management system and a battery module. The box cover 20 covers the box body 10 and forms a receiving cavity with the box body 10. The battery management system and the battery module are arranged in the receiving cavity. It should be noted that the overall structure of the box body 10, the box cover 20, the battery management system and the battery module are all known in the art and are not limited here. In addition, the structure, model, and configuration of the battery management system and the battery module themselves in the receiving cavity are not limited here. For example, the battery contained in the battery module can be a lithium battery, etc.

[0022] Specifically, the box body 10 and the box cover 20 also have at least one circuitous channel formed by the two themselves, the circuitous channel is distributed around the receiving cavity and the two ends of the circuitous channel are respectively connected to the receiving cavity inside the battery box and the external environment, and the box cover 20 has a plurality of spaced convex teeth on the side facing the box body 10, and the plurality of convex teeth divide the circuitous channel into narrow sections 31 and cavity sections 32 that are alternately distributed and connected along the length extension direction of the box cover 20.

[0023] Specifically, the depth δ of the narrow section 31 is 0.1 mm-0.5 mm, the length n of the narrow section 31 is 0.5 mm-2 mm, the length s of the cavity section 32 is 0.9 mm-2.7 mm, the depth h of the cavity section 32 is greater than the length s of the cavity section 32, wherein the length of the convex tooth is equal to the length n of the narrow section 31, and the tooth pitch m between the multiple convex teeth is 1 mm-4 mm.

[0024] Specifically, the lithium batteries inside the battery box will release heat when working. When the heat is transferred to the air in the battery box, the air in the battery box will expand due to the heat, and a pressure difference will be generated with the outside of the battery box. Under the action of the pressure difference between the inside and outside of the battery box, the air in the battery box will flow from the inside of the box to the outside of the box. This part of the airflow will pass through the narrow section 31 and the cavity section 32 alternately in sequence when passing through the circuitous channel. When the airflow flows through the narrow section 31, due to local resistance, the pressure and temperature of the airflow decrease while the speed increases, which is similar to an adiabatic throttling process. After the airflow flows from the narrow section 31 into the cavity section 32, due to the sudden expansion of the flow area, the airflow forms a strong vortex in the cavity section 32, the speed almost completely disappears, the kinetic energy is converted into heat, and isobaric expansion occurs in the cavity section 32. The airflow temperature rises back to a level close to that before flowing into the narrow section 31. When the airflow passes through the narrow section 31 and the cavity section 32, the pressure is gradually reduced to close to the back pressure, making it impossible for the airflow to flow out, thereby achieving a gas sealing state, and then achieving a significant thermal insulation effect in a low-temperature environment.

[0025] The following will further explain the technical solution, its implementation process and principles in conjunction with specific implementation cases.

[0026] Example 1 See also Figure 1-Figure 3A battery system includes a box body 10, a box cover 20, a battery management system and a battery module. The box cover 20 covers the box body 10 and forms a receiving cavity with the box body 10. The battery management system and the battery module are arranged in the receiving cavity. It should be noted that the overall structure of the box body 10, the box cover 20, the battery management system and the battery module are all known in the art and are not limited here. In addition, the structure, model, and configuration of the battery management system and the battery module themselves in the receiving cavity are not limited here. For example, the battery contained in the battery module can be a lithium battery, etc.

[0027] Specifically, the box body 10 and the box cover 20 also have a circuitous passage formed by the two themselves, and the box cover 20 has a plurality of spaced convex teeth on the side facing the box body 10, which divide the circuitous passage into narrow sections 31 and cavity sections 32 that are alternately distributed and connected along the length extension direction of the box cover 20.

[0028] Specifically, the depth δ of the narrow section 31 is 0.1 mm, the length n of the narrow section 31 is 0.5 mm, the length s of the cavity section 32 is 0.9 mm, the depth h of the cavity section 32 is 1.2 mm, wherein the length of the convex teeth is equal to the length n of the narrow section 31, and the tooth pitch m between the plurality of convex teeth is 1.4 mm.

[0029] The size of the box in this embodiment is 350mm 200mm 150mm, the box wall thickness is 1.5mm.

[0030] After the temperature sensor was installed in the battery system, it was placed in the environmental chamber, and the temperature of the environmental chamber was cooled from 25°C to -20°C. The time for the temperature in the chamber to drop to -20°C was recorded as 41 minutes.

[0031] Example 2 This embodiment is basically the same as Embodiment 1, except that: the depth δ of the narrow section 31 in this embodiment is 0.3 mm, the length n of the narrow section 31 is 1.2 mm, the length s of the cavity section 32 is 1.8 mm, the depth h of the cavity section 32 is 2.5 mm, wherein the length of the convex tooth is equal to the length n of the narrow section 31, and the tooth pitch m between the plurality of convex teeth is 3 mm.

[0032] After the temperature sensor is installed in the battery system, it is placed in the environmental chamber, and the temperature of the environmental chamber is cooled from 25°C to -20°C. The time for the temperature in the chamber to drop to -20°C is recorded as 40 minutes.

[0033] Example 3 This embodiment is basically the same as Embodiment 1, except that: the depth δ of the narrow section 31 in this embodiment is 0.5 mm, the length n of the narrow section 31 is 2 mm, the length s of the cavity section 32 is 2 mm, the depth h of the cavity section 32 is 2.3 mm, wherein the length of the convex tooth is equal to the length n of the narrow section 31, and the tooth pitch m between the plurality of convex teeth is 4 mm.

[0034] After the temperature sensor was installed in the battery system, it was placed in the environmental chamber, and the temperature of the environmental chamber was cooled from 25°C to -20°C. The time for the temperature in the chamber to drop to -20°C was recorded as 45 minutes.

[0035] Comparative Example 1 Comparative Example 1 is basically the same as Example 1, except that: the depth δ of the narrow section 31 in Comparative Example 1 is 0.1 mm, the length n of the narrow section 31 is 0.5 mm, the length s of the cavity section 32 is 0.9 mm, and the depth h of the cavity section 32 is 0.8 mm, wherein the length of the convex tooth is equal to the length n of the narrow section 31, and the tooth pitch m between the multiple convex teeth is 1.4 mm.

[0036] After the temperature sensor was installed in the battery system, it was placed in the environmental chamber, and the temperature of the environmental chamber was cooled from 25°C to -20°C. The time for the temperature in the chamber to drop to -20°C was recorded as 26 minutes.

[0037] Comparative Example 2 Comparative Example 2 is basically the same as Example 1, except that: the depth δ of the narrow section 31 in Comparative Example 2 is 0.1 mm, the length n of the narrow section 31 is 0.5 mm, the length s of the cavity section 32 is 0.9 mm, the depth h of the cavity section 32 is 0.5, wherein the length of the convex tooth is equal to the length n of the narrow section 31, and the tooth pitch m between the multiple convex teeth is 2.9 mm.

[0038] After the temperature sensor was installed in the battery system, it was placed in the environmental chamber, and the temperature of the environmental chamber was cooled from 25°C to -20°C. The time it took for the temperature in the chamber to drop to -20°C was recorded as 23 minutes.

[0039] Comparative Example 3 Comparative Example 3 is basically the same as Example 1, except that: the depth δ of the narrow section 31 in Comparative Example 3 is 0.1 mm, the length n of the narrow section 31 is 2.5 mm, the length s of the cavity section 32 is 0.9 mm, and the depth h of the cavity section 32 is 1.2 mm, wherein the length of the convex tooth is equal to the length n of the narrow section 31, and the tooth pitch m between the multiple convex teeth is 3.2 mm.

[0040] After the temperature sensor is installed in the battery system, it is placed in the environmental chamber, and the temperature of the environmental chamber is cooled from 25°C to -20°C. The time for the temperature in the chamber to drop to -20°C is recorded as 25 minutes.

[0041] Comparative Example 4 Comparative Example 4 is basically the same as Example 1, except that: the depth δ of the narrow section 31 in Comparative Example 4 is 0.1 mm, the length n of the narrow section 31 is 2.5 mm, the length s of the cavity section 32 is 0.9 mm, the depth h of the cavity section 32 is 0.5, wherein the length of the convex tooth is equal to the length n of the narrow section 31, and the tooth pitch m between the multiple convex teeth is 3.2 mm.

[0042] After the temperature sensor is installed in the battery system, it is placed in the environmental chamber, and the temperature of the environmental chamber is cooled from 25°C to -20°C. The time for the temperature in the chamber to reach -20°C is recorded as 18 minutes.

[0043] It should be understood that the above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A labyrinth-type battery box sealing and heat preservation structure, characterized in that: The labyrinth battery box sealing and heat preservation structure is arranged at the connection between the box body and the box cover or the battery management system of the battery box, and the labyrinth battery box sealing and heat preservation structure comprises at least one circuitous channel, and the circuitous channel comprises narrow sections and cavity sections which are alternately distributed and connected along the extension direction of its own length, and the depth δ of the narrow section is less than the depth h of the cavity section; When the airflow entering the detour channel flows through the narrow section, due to local resistance, the pressure and temperature of the airflow decrease and the speed increases. After the airflow flows from the narrow section into the cavity section, due to the sudden expansion of the flow area, the airflow forms a strong vortex in the cavity section, the speed almost completely disappears, the kinetic energy is converted into heat, and isobaric expansion occurs in the cavity section. The temperature of the airflow rises back to a level close to that before flowing into the narrow section. When the airflow passes through multiple narrow sections and cavity sections, the pressure is gradually reduced to close to the back pressure, so that the airflow cannot flow out, thereby achieving a gas sealing state.

2. According to claim 1, the labyrinth-type battery box sealing and heat preservation structure is characterized in that: The depth h of the cavity segment is greater than the length s of the cavity segment, and the ratio of the depth δ of the narrow segment, the length n of the narrow segment, and the length s of the cavity segment is (0.1-0.5): (0.5-2): (0.9-2.7).

3. The labyrinth-type battery box sealing and heat preservation structure according to claim 2, characterized in that: The depth δ of the narrow section is 0.1 mm-0.5 mm, the length n of the narrow section is 0.5 mm-2 mm, and the length s of the cavity section is 0.9 mm-2.7 mm.

4. The labyrinth-type battery box sealing and heat preservation structure according to claim 1, 2 or 3, characterized in that: The labyrinth-type battery box sealing and insulation structure is arranged between a first working surface and a second working surface, the first working surface is located on the box body of the battery box, and the second working surface is located on the box cover or the battery management system. One of the first working surface and the second working surface is a continuous plane, and the other has a plurality of convex teeth arranged at intervals, and the narrow section is correspondingly arranged between the convex teeth and the first working surface or the second working surface.

5. According to claim 4, the labyrinth-type battery box sealing and heat preservation structure is characterized in that: The ratio of the tooth pitch m between the plurality of convex teeth to the length s of the cavity section is (1-4): (0.9-2.7), and the length of the convex teeth is equal to the length n of the narrow section.

6. The labyrinth-type battery box sealing and heat preservation structure according to claim 5, characterized in that: The tooth pitch m between the plurality of protruding teeth is 1 mm-4 mm.

7. A battery box, characterized in that: The battery box has the labyrinth-type battery box sealing and heat-insulating structure described in any one of claims 1-6.

8. A battery system, characterized in that: include: The battery box as claimed in claim 7, and a battery module, wherein the battery module is encapsulated in the battery box.

9. A mobile power source, characterized in that: include: The battery box as claimed in claim 7, or the battery system as claimed in claim 8.

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