Battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery pack which comprises a shell, batteries, a thermosiphon and a heat dissipation module, the battery is arranged in the shell; the thermosiphon is located in the shell and comprises an evaporation section, a condensation section and a heat insulation section. The evaporation section is positioned at the bottom of the battery; the condensation section is located above the evaporation section and is adjacent to the battery, and the heat insulation section is connected between the evaporation section and the condensation section; the heat dissipation module is arranged in the shell, the heat insulation section is located between the heat dissipation module and the battery, and the heat dissipation module and the condensation section are adjacently arranged in the vertical direction. The battery pack has high adaptability, can keep stable performance in various environments, is simple in structure, avoids introduction of complex mechanical parts, and is suitable for popularization and application. Therefore, the overall cost of the system is effectively reduced, and the space is saved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to battery packs. Background Technology

[0002] In the field of new energy vehicles, thermal management systems play a crucial role, and their efficiency directly affects the overall performance and safety of the vehicle. Currently, thermal management systems for new energy vehicles are mainly divided into three categories: air-cooled, liquid-cooled, and refrigerant direct-cooled, each designed according to specific application scenarios and technical requirements.

[0003] When choosing a battery cooling method, the battery's temperature uniformity and cooling efficiency are key indicators for evaluating the merits of the solution. Air-cooled systems are simple in structure and economical in cost; however, relying on air as the heat exchange medium makes them highly susceptible to fluctuations in ambient temperature. Especially under extreme climate conditions such as extreme heat or cold, their heat transfer efficiency drops significantly, limiting their application scenarios. In contrast, liquid-cooled systems use a coolant as the heat transfer medium, which has a higher specific heat capacity and heat transfer coefficient than air, enabling more effective uniform cooling and efficient heat dissipation of the battery. However, liquid-cooled systems have a complex structural design, increasing the overall weight of the battery and occupying space in the vehicle compartment. Refrigerant direct cooling technology is a rapid cooling solution between air and liquid cooling, introducing refrigerant from the vehicle's air conditioning system into the evaporator inside the battery pack. Cooling is achieved through the refrigerant's evaporation and heat absorption process. However, this process requires the coordinated operation of key components such as an electric compressor, dual evaporators, a condenser, and dual expansion valves to drive the refrigerant circulation within the system, resulting in a complex structural design and higher cost. Utility Model Content

[0004] In view of this, the present invention provides a battery pack to solve the problems that existing battery cooling methods are easily affected by fluctuations in external ambient temperature, and have complex structural designs and high costs.

[0005] This utility model provides a battery pack, including a housing, a battery, a thermosiphon, and a heat dissipation module; the battery is disposed inside the housing; the thermosiphon is located inside the housing and includes an evaporation section, a condensation section, and an insulation section; the evaporation section is located at the bottom of the battery; the condensation section is located above the evaporation section and adjacent to the battery, and the insulation section connects the evaporation section and the condensation section; the heat dissipation module is disposed inside the housing, the insulation section is located between the heat dissipation module and the battery, and the heat dissipation module and the condensation section are vertically adjacent to each other.

[0006] Beneficial effects: By placing the evaporation section of the thermosiphon at the bottom of the battery, the refrigerant in the thermosiphon evaporates in the evaporation section, carrying away the heat from the battery. The refrigerant vapor is cooled into liquid refrigerant by the heat dissipation module in the condensation section, and then returns to the evaporation section under the action of gravity to complete the cycle. It makes full use of the vaporization and condensation phase change characteristics of the refrigerant, as well as the unique advantage of the refrigerant achieving automatic circulation without external power, to efficiently transfer the heat generated by the battery. It has strong adaptability, can maintain stable performance in various environments, and has a simple structure, avoiding the introduction of complex mechanical parts, thereby effectively reducing the overall cost of the system and saving space.

[0007] In one alternative embodiment, the heat dissipation module includes a first heat dissipation component disposed above the condensation section.

[0008] Beneficial effects: By setting the first heat dissipation component above the condensing section, the heat released above the condensing section can be dissipated into the air more quickly, promoting the transfer of heat between the condensing section and the surrounding environment, thereby reducing the temperature of the condensing section. This plays an important role in improving heat dissipation and optimizing the heat transfer process.

[0009] In one alternative embodiment, the heat dissipation module further includes a second heat dissipation component disposed below the condensation section.

[0010] Beneficial effects: By setting a second heat dissipation component below the condensing section, the heat released below the condensing section can be dissipated into the air more quickly, promoting the transfer of heat between the condensing section and the surrounding environment, thereby reducing the temperature of the condensing section. This plays an important role in improving heat dissipation and optimizing the heat transfer process.

[0011] In one optional embodiment, the first heat dissipation component includes a plurality of first heat sinks, which are arranged sequentially at intervals, with a gap between adjacent first heat sinks; the second heat dissipation component includes a plurality of second heat sinks, with the positions of the plurality of second heat sinks corresponding one-to-one with the positions of the plurality of gaps.

[0012] Beneficial effects: Since the first heat sink is located above the condensation section and the second heat sink is located below the condensation section, and there is a first gap between each pair of adjacent first heat sinks, and the positions of multiple second heat sinks correspond one-to-one with the positions of multiple first gaps, this arrangement can make more efficient use of space and form more heat dissipation channels; at the same time, the cross-arranged first and second heat sinks can also optimize the heat conduction path, so that the heat is more evenly distributed on the heat sinks, avoiding local overheating or uneven heat dissipation.

[0013] In one alternative embodiment, a first fan module is further included, which is disposed on the housing and adjacent to the heat dissipation module.

[0014] Beneficial effects: By setting up the first fan module, the airflow around the heat dissipation module can be accelerated, allowing heat to be dissipated into the air more quickly, increasing the heat exchange rate between the heat dissipation module and the air, and more effectively removing heat from the heat dissipation module, thereby reducing the temperature of the heat dissipation module; and by accelerating the heat dissipation process, it can help reduce the overall temperature of the battery pack, thereby reducing the load on the battery pack, which can reduce the failure rate and maintenance costs of the battery pack, and contribute to the long-term stable operation of the battery pack.

[0015] In one optional embodiment, the first fan module includes one or more first fans; the housing is provided with one or more first mounting holes, the plurality of first mounting holes are spaced apart, and each first mounting hole houses one first fan.

[0016] Beneficial effects: By setting a first mounting hole on the housing and placing the first fan inside the first mounting hole, it helps to maintain air circulation inside and outside the battery pack housing, realizes the exhaust of hot air inside the housing and the entry of cold air outside the housing, more effectively removes heat from the housing, avoids heat accumulation inside the battery pack, and improves heat dissipation efficiency.

[0017] In one alternative embodiment, a second fan module is further included, which is disposed on the housing and adjacent to the battery.

[0018] Beneficial effects: Since the second fan module is located adjacent to the battery, it can directly and efficiently dissipate heat from the battery, significantly improving the battery's heat dissipation efficiency.

[0019] In one optional embodiment, the second fan module includes one or more second fans; the housing is provided with one or more second mounting holes, the plurality of second mounting holes are spaced apart, and each second mounting hole houses one second fan.

[0020] Beneficial effects: By setting a second mounting hole on the housing and placing the second fan inside the second mounting hole, it helps to maintain air circulation inside and outside the battery pack housing, realizes the exhaust of hot air inside the housing and the entry of cold air outside the housing, more effectively removes heat from the housing, avoids heat accumulation inside the battery pack, and improves heat dissipation efficiency.

[0021] In one alternative embodiment, the distance between the insulation section and the battery gradually increases towards the side closer to the condensation section; and the distance between the condensation section and the bottom of the housing gradually decreases towards the side closer to the battery.

[0022] Beneficial effects: By tilting the adiabatic and condensing sections, the flow state of the refrigerant within the thermosiphon tube can be altered. When placed horizontally or nearly horizontally, the refrigerant may accumulate in certain areas due to gravity, hindering flow. The tilted design utilizes gravity to allow the refrigerant to flow more easily along the tube wall to the evaporation section, reducing accumulation and stagnation in the condensation section. This promotes refrigerant recirculation, ensuring the refrigerant can smoothly return to the evaporation section for re-evaporation, thus guaranteeing the refrigerant can complete the evaporation-condensation cycle within the thermosiphon tube.

[0023] In one alternative embodiment, the evaporation section is connected to the battery via thermally conductive adhesive.

[0024] Beneficial effects: Because the evaporation section and the battery are connected by thermally conductive adhesive, heat can be transferred from the battery to the evaporation section in a highly efficient manner, which greatly improves the heat transfer efficiency. Moreover, due to the adhesive properties of the thermally conductive adhesive, the connection between the battery and the evaporation section can be effectively maintained for a long time and a stable connection. The reliability and stability of this connection method further ensure the continuity of the heat exchange process between the evaporation section and the battery. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this utility model, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a front view of a battery pack according to an embodiment of the present utility model;

[0027] Figure 2 This is a schematic diagram of the internal structure of the battery pack according to an embodiment of the present utility model;

[0028] Figure 3 This is a schematic diagram of the connection structure of the battery, thermosiphon, and heat dissipation module in an embodiment of the present utility model.

[0029] Figure 4 This is a schematic diagram of the structure of the thermosiphon and heat dissipation module according to an embodiment of the present utility model;

[0030] Figure 5 for Figure 4 A magnified view of part A in the diagram;

[0031] Figure 6 This is a side view of the thermosiphon and heat dissipation module according to an embodiment of the present invention;

[0032] Figure 7 This is a right view of the battery pack according to an embodiment of the present utility model;

[0033] Figure 8 This is a left view of the battery pack according to an embodiment of the present invention.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Housing; 2. Battery; 3. Thermosiphon; 31. Evaporation section; 32. Condensation section; 33. Insulation section; 4. Heat dissipation module; 41. First heat dissipation component; 411. First heat sink; 42. Second heat dissipation component; 421. Second heat sink; 5. First fan module; 6. Second fan module. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0037] The following is combined with Figures 1 to 8 The following describes embodiments of the present invention.

[0038] According to an embodiment of the present invention, a battery pack is provided, including a housing 1, a battery 2, a thermosiphon 3, and a heat dissipation module 4; the battery 2 is disposed inside the housing 1; the thermosiphon 3 is located inside the housing 1 and includes an evaporation section 31, a condensation section 32, and an insulation section 33; the evaporation section 31 is located at the bottom of the battery 2; the condensation section 32 is located above the evaporation section 31 and is adjacent to the battery 2; the insulation section 33 is connected between the evaporation section 31 and the condensation section 32; the heat dissipation module 4 is disposed inside the housing 1, the insulation section 33 is located between the heat dissipation module 4 and the battery 2, and the heat dissipation module 4 and the condensation section 32 are arranged adjacent to each other in the vertical direction.

[0039] It should be noted that in this utility model, the battery pack can be composed of multiple individual batteries directly integrated into the battery pack, that is, battery 2 can be a single battery; or multiple individual batteries can be first integrated to form a battery module, and then the battery module can be integrated into the battery pack, that is, battery 2 can be a battery module.

[0040] By placing the evaporation section 31 of the thermosiphon 3 at the bottom of the battery 2, the refrigerant in the thermosiphon 3 is heated and evaporated in the evaporation section 31, carrying away the heat from the battery 2. The refrigerant vapor is cooled into refrigerant liquid by the heat dissipation module 4 in the condensation section 32, and then returns to the evaporation section 31 under the action of gravity to complete the cycle. This fully utilizes the vaporization and condensation phase change characteristics of the refrigerant, as well as the unique advantage of the refrigerant being able to achieve automatic circulation without external power, to efficiently transfer the heat generated by the battery 2. It has strong adaptability, can maintain stable performance in various environments, and has a simple structure, avoiding the introduction of complex mechanical parts, thereby effectively reducing the overall cost of the system and saving space.

[0041] In a specific implementation, the evaporation section 31 serves as the heat input section, where the refrigerant absorbs heat from the battery 2 and evaporates into a gaseous state; the condensation section 32 serves as the heat output section, where the refrigerant releases heat and condenses into a liquid state; and the insulation section 33 is located between the evaporation section 31 and the condensation section 32, mainly serving to insulate heat and transport refrigerant vapor, preventing the refrigerant vapor from cooling before reaching the condensation section 32.

[0042] In one embodiment, the heat dissipation module 4 includes a first heat dissipation component 41, which is disposed above the condensation section 32.

[0043] By setting the first heat dissipation component 41 above the condensing section 32, the heat released above the condensing section 32 can be dissipated into the air more quickly, promoting the transfer of heat between the condensing section 32 and the surrounding environment, thereby reducing the temperature of the condensing section 32. This plays an important role in improving heat dissipation and optimizing the heat transfer process.

[0044] In one embodiment, the heat dissipation module 4 further includes a second heat dissipation component 42, which is disposed below the condensation section 32.

[0045] By setting a second heat dissipation component 42 below the condensing section 32, the heat released below the condensing section 32 can be dissipated into the air more quickly, promoting the transfer of heat between the condensing section 32 and the surrounding environment, thereby reducing the temperature of the condensing section 32. This plays an important role in improving heat dissipation and optimizing the heat transfer process.

[0046] In one embodiment, the first heat dissipation component 41 includes a plurality of first heat dissipation fins 411, which are arranged sequentially at intervals, with a gap between adjacent first heat dissipation fins 411; the second heat dissipation component 42 includes a plurality of second heat dissipation fins 421, with the positions of the plurality of second heat dissipation fins 421 corresponding one-to-one with the positions of the plurality of gaps.

[0047] Since the first heat sink 411 is located above the condensation section 32 and the second heat sink 421 is located below the condensation section 32, and a first gap is provided between each pair of adjacent first heat sinks 411, and the positions of multiple second heat sinks 421 and multiple first gaps correspond one-to-one, this arrangement can make more efficient use of space and form more heat dissipation channels. At the same time, the cross-arranged first heat sinks 411 and second heat sinks 421 can also optimize the heat conduction path, so that the heat is more evenly distributed on the heat sink, avoiding local overheating or uneven heat dissipation.

[0048] In a specific implementation, the thermosiphon 3 is a flat thermosiphon; the evaporation section 31, the condensation section 32 and the insulation section 33 are all plate-shaped structures; the first heat sink 411 and the second heat sink 421 are both straight ribs.

[0049] In an alternative embodiment, when the usable space inside the housing 1 is small, the condensation section 32 can be a cylindrical pipe structure that extends along the length of the housing 1; the heat dissipation module 4 is composed of multiple ring ribs or multiple pin ribs, and the multiple ring ribs or multiple pin ribs are evenly wrapped around the surface of the cylindrical pipe; specifically, the selection of ring ribs and pin ribs can be determined according to specific application requirements.

[0050] In one embodiment, a first fan module 5 is further included, which is disposed on the housing 1 and adjacent to the heat dissipation module 4.

[0051] By setting the first fan module 5, the airflow around the heat dissipation module 4 can be accelerated, allowing heat to be dissipated into the air more quickly, increasing the heat exchange rate between the heat dissipation module 4 and the air, and more effectively removing the heat from the heat dissipation module 4, thereby reducing the temperature of the heat dissipation module 4; and by accelerating the heat dissipation process, it can help reduce the overall temperature of the battery pack, thereby reducing the load on the battery pack, which can reduce the failure rate and maintenance costs of the battery pack, and contribute to the long-term stable operation of the battery pack.

[0052] In one embodiment, the first fan module 5 includes one or more first fans; the housing 1 is provided with one or more first mounting holes, the plurality of first mounting holes are spaced apart, and each first mounting hole contains one first fan.

[0053] By providing a first mounting hole on the housing 1 and placing the first fan inside the first mounting hole, it helps to maintain air circulation inside and outside the battery pack housing 1, enabling the exhaust of hot air inside the housing 1 and the entry of cold air outside the housing 1, more effectively removing heat from the housing 1, preventing heat from accumulating inside the battery pack, and improving heat dissipation efficiency.

[0054] In one embodiment of this invention, the first fan module 5 includes one first fan, and the housing 1 has a first mounting hole, with the first fan disposed within the first mounting hole. In another embodiment of this invention, the first fan module 5 includes two first fans, and the housing 1 has two first mounting holes, with the two first fans respectively disposed within the two first mounting holes. In yet another embodiment of this invention, the first fan module 5 includes four first fans, and the housing 1 has four first mounting holes, with the four first fans corresponding one-to-one with the four first mounting holes. Specifically, the number and mounting positions of the first fans can be set according to actual conditions.

[0055] In one embodiment, a second fan module 6 is also included, which is disposed on the housing 1 and adjacent to the battery 2.

[0056] Since the second fan module 6 is arranged adjacent to the battery 2, the second fan module 6 can directly and efficiently dissipate heat from the battery 2, significantly improving the heat dissipation efficiency of the battery 2.

[0057] In one embodiment of this example, a set of second fan modules 6 is provided, and the first fan module 5 and the second fan module 6 are disposed opposite to each other on both sides of the housing 1; or the first fan module 5 and the second fan module 6 are disposed on adjacent sides of the housing 1.

[0058] In another embodiment of this example, the second fan module 6 is provided in two sets, one set of the second fan module 6 is disposed opposite to the first fan module 5 on both sides of the housing 1, and the other set of the second fan module 6 is disposed opposite to the first fan module 5 on both sides of the housing 1; or the two sets of the second fan module 6 are disposed opposite to each other on both sides of the housing 1, and are both disposed adjacent to the first fan module 5.

[0059] In another embodiment of this example, the second fan module 6 is provided in three groups. One group of the second fan module 6 is disposed opposite to the first fan module 5 on both sides of the housing 1, and the other two groups of the second fan module 6 are disposed opposite to the two sides of the housing 1, and are both disposed adjacent to the first fan module 5.

[0060] In one embodiment, the second fan module 6 includes one or more second fans; the housing 1 is provided with one or more second mounting holes, the plurality of second mounting holes are spaced apart, and each second mounting hole houses one second fan.

[0061] By providing a second mounting hole on the housing 1 and placing the second fan inside the second mounting hole, it helps to maintain air circulation inside and outside the battery pack housing 1, enabling the exhaust of hot air inside the housing 1 and the entry of cold air outside the housing 1, more effectively removing heat from the housing 1, preventing heat from accumulating inside the battery pack, and improving heat dissipation efficiency.

[0062] In one embodiment of this invention, the second fan module 6 includes one second fan, and the housing 1 has a second mounting hole in which the second fan is disposed. In another embodiment of this invention, the second fan module 6 includes two second fans, and the housing 1 has two second mounting holes in which the two second fans are respectively disposed. In yet another embodiment of this invention, the second fan module 6 includes four second fans, and the housing 1 has four second mounting holes in which the four second fans are respectively disposed in a one-to-one correspondence with the four second mounting holes. Specifically, the number and installation position of the second fans can be set according to actual conditions.

[0063] In one embodiment, the distance between the heat insulation section 33 and the battery 2 gradually increases towards the side closer to the condensation section 32; and the distance between the condensation section 32 and the bottom of the housing 1 gradually decreases towards the side closer to the battery 2.

[0064] By tilting the adiabatic section 33 and the condensing section 32, the flow state of the refrigerant in the thermosiphon tube 3 can be changed. When placed horizontally or nearly horizontally, the refrigerant may accumulate in certain areas due to gravity, resulting in poor flow. However, the tilted arrangement can utilize gravity to allow the refrigerant to flow more easily along the tube wall to the evaporating section 31, reducing accumulation and retention in the condensing section 32, promoting refrigerant reflux, ensuring that the refrigerant can smoothly return to the evaporating section 31 for re-evaporation, and ensuring that the refrigerant can complete the evaporation and condensation cycle in the thermosiphon tube 3.

[0065] In one embodiment, the evaporation section 31 is connected to the battery 2 by thermally conductive adhesive.

[0066] Because the evaporation section 31 and the battery 2 are connected by thermally conductive adhesive, heat can be efficiently transferred from the battery 2 to the evaporation section 31, greatly improving the heat transfer efficiency. Furthermore, due to the adhesive properties of the thermally conductive adhesive, the connection between the battery 2 and the evaporation section 31 can be effectively maintained for a long time and remain stable. The reliability and stability of this connection method further ensure the continuity of the heat exchange process between the evaporation section 31 and the battery 2.

[0067] Specifically, by employing a thermosiphon 3 combined with the strong heat exchange characteristics of the fins, supplemented by external forced convection air cooling, and utilizing the phase change heat change of the refrigerant with high heat exchange efficiency, rapid cooling of battery 2 can be achieved under high-temperature environments and operating conditions. Compared with cooling methods such as liquid cooling and air cooling, battery 2 exhibits better temperature uniformity; compared with direct cooling methods using refrigerants, it has a simpler structure and significantly reduced overall cost.

[0068] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery pack, characterized in that, include: Shell (1); The battery (2) is disposed inside the housing (1); A thermosiphon tube (3) is located inside the housing (1) and includes an evaporation section (31), a condensation section (32) and an insulation section (33); the evaporation section (31) is located at the bottom of the battery (2); the condensation section (32) is located above the evaporation section (31) and is adjacent to the battery (2); the insulation section (33) is connected between the evaporation section (31) and the condensation section (32). A heat dissipation module (4) is disposed inside the housing (1), the heat insulation section (33) is located between the heat dissipation module (4) and the battery (2), and the heat dissipation module (4) and the condensation section (32) are arranged adjacent to each other in the vertical direction; As the distance approaches the condensation section (32), the distance between the insulation section (33) and the battery (2) gradually increases; and as the distance approaches the battery (2), the distance between the condensation section (32) and the bottom of the casing (1) gradually decreases.

2. The battery pack according to claim 1, characterized in that, The heat dissipation module (4) includes a first heat dissipation component (41), which is disposed above the condensation section (32).

3. The battery pack according to claim 2, characterized in that, The heat dissipation module (4) further includes a second heat dissipation component (42), which is disposed below the condensation section (32).

4. The battery pack according to claim 3, characterized in that, The first heat dissipation component (41) includes a plurality of first heat sinks (411), which are arranged in sequence at intervals, and a gap is provided between two adjacent first heat sinks (411); the second heat dissipation component (42) includes a plurality of second heat sinks (421), and the positions of the plurality of second heat sinks (421) correspond one-to-one with the positions of the plurality of gaps.

5. The battery pack according to any one of claims 1 to 4, characterized in that, It also includes a first fan module (5), which is disposed on the housing (1) and adjacent to the heat dissipation module (4).

6. The battery pack according to claim 5, characterized in that, The first fan module (5) includes one or more first fans; the housing (1) is provided with one or more first mounting holes, the plurality of first mounting holes are spaced apart, and each first mounting hole contains one first fan.

7. The battery pack according to any one of claims 1 to 4, characterized in that, It also includes a second fan module (6), which is disposed on the housing (1) and adjacent to the battery (2).

8. The battery pack according to claim 7, characterized in that, The second fan module (6) includes one or more second fans; the housing (1) is provided with one or more second mounting holes, the plurality of second mounting holes are spaced apart, and each second mounting hole is equipped with a second fan.

9. The battery pack according to any one of claims 1 to 4, characterized in that, The evaporation section (31) is connected to the battery (2) by thermally conductive adhesive.

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