Battery thermal management system of electric mixer truck

Abstract

The utility model provides a battery heat management system of an electric mixer truck, which belongs to the technical field of electric mixer trucks and comprises a battery pack, a heat transfer module, a heating module and a cooling module, a battery sleeve is arranged outside the battery pack and is in pipeline connection with the heat transfer module, and the battery pack exchanges heat with the heat transfer module. The heating module provides a heat source for the heat transfer module, the cooling module provides a cold source for the heat transfer module, and the cooling module comprises a compressor, a condenser, an expansion valve and a heat exchanger; the heat exchanger is an indirect heat exchanger, a heating medium inlet and a heating medium outlet of the heat exchanger are both connected with the heat transfer module through pipelines, and the refrigerant side of the heat exchanger, the compressor, the condenser and the expansion valve are sequentially connected through pipelines to form a closed loop. According to the invention, a suitable temperature is created for the battery, battery performance degradation caused by overheating and charging and discharging dilemma caused by low temperature are effectively avoided, the overall energy efficiency of the stirrer is improved, the energy consumption loss is reduced, and the power output stability is enhanced.

Description

Technical Field

[0001] This utility model belongs to the technical field of electric mixer trucks, and specifically relates to the battery thermal management system for electric mixer trucks. Technical Background

[0002] With the booming development of electric vehicles, ensuring battery performance and lifespan has become a core concern. The importance of the battery thermal management system, as a key supporting technology, is self-evident. The complex and ever-changing operating conditions of vehicles, coupled with external environmental factors, present batteries with severe temperature challenges. High temperatures can easily trigger battery thermal runaway, accelerating battery aging and performance degradation; low temperatures weaken battery charging and discharging performance, reducing driving range and decreasing power output stability.

[0003] Patent CN119009002A discloses a thermal management system and method for cold start of fuel cell vehicles. The patent includes a fuel cell stack, a heat accumulator, a heater, and a radiator, connected by a three-way valve to form a circulation loop. It is equipped with multiple water temperature sensors and a cooling fan, effectively managing temperature changes during cold start and operation of the fuel cell vehicle, improving thermal efficiency, extending battery life, and optimizing overall performance.

[0004] The patent disclosed in CN119009002A, which describes a thermal management system and method for cold starting of fuel cell vehicles, has the following shortcomings: 1. It uses a radiator to cool water that has absorbed heat from the battery, resulting in low heat dissipation efficiency, which cannot meet the requirements of high-load conditions and high-temperature working environments for feed electric vehicle mixers; 2. It uses a heat accumulator to heat the battery pack, which is only applicable to fuel cells and cannot be applied to feed electric vehicle mixers, and it cannot effectively control the heating temperature of the battery pack. Utility Model Content

[0005] To overcome the problems existing in the prior art, this utility model provides a battery thermal management system for electric mixer trucks. This system creates a suitable temperature for the battery, effectively avoiding battery performance degradation caused by overheating and charging / discharging difficulties caused by low temperatures. It greatly improves the overall energy efficiency of the mixer, reduces energy loss, and enhances the stability of power output.

[0006] An electric mixer truck battery thermal management system includes a battery pack, a heat transfer module, a heating module, and a cooling module. The battery pack is equipped with a battery sleeve, which is connected to the heat transfer module via pipes. The battery pack exchanges heat with the heat transfer module. The heating module provides a heat source for the heat transfer module, and the cooling module provides a cold source for the heat transfer module. The cooling module includes a compressor, a condenser, an expansion valve, and a heat exchanger. The heat exchanger is an indirect heat exchanger. The heat medium inlet and outlet of the heat exchanger are both connected to the heat transfer module via pipes. The refrigerant side of the heat exchanger, the compressor, the condenser, and the expansion valve are connected in sequence via pipes to form a closed loop.

[0007] Furthermore, the cooling module also includes a dryer, the inlet of which is connected to the outlet pipe of the condenser, and the outlet of the dryer is connected to the inlet pipe of the expansion valve.

[0008] Furthermore, the cooling module also includes a gas-liquid separator, the inlet of which is connected to the heat medium outlet pipe of the heat exchanger, and the outlet of which is connected to the inlet pipe of the compressor.

[0009] Furthermore, a temperature and pressure sensor is installed on the pipe between the outlet of the condenser and the inlet of the dryer.

[0010] Furthermore, a temperature sensor is installed on the pipe between the refrigerant outlet of the heat exchanger and the inlet of the gas-liquid separator.

[0011] Furthermore, the heat transfer module includes a pump, and the pump outlet, battery sleeve, and heat medium side of the heat exchanger are connected in sequence through pipes to form a closed loop.

[0012] Furthermore, the heating module includes a PTC heater, the inlet of which is connected to the battery sleeve pipe, and the outlet of which is connected to the heat medium inlet pipe of the heat exchanger.

[0013] Furthermore, the heat transfer module also includes an expansion tank, and a main heat transfer pipe is formed between the battery sleeve outlet and the PTC heater inlet. The inlet and outlet of the expansion tank are respectively connected to the main heat transfer pipe, and the expansion tank and the main heat transfer pipe form a bypass between each other.

[0014] Furthermore, three-way valves are installed at the connection points between the inlet and outlet of the expansion tank and the main heat transfer pipe.

[0015] Furthermore, a shut-off valve is also provided between the two three-way valves in the main heat transfer pipe.

[0016] Compared with the prior art, the present invention has achieved the following beneficial effects:

[0017] 1. This utility model discloses a battery thermal management system for an electric mixer truck. At high temperatures, the cooling module provides strong cooling, while the heat transfer module assists in heat dissipation. At low temperatures, the heating module provides heating, and the cooling module is in standby or moderately adjusted to prevent overheating. The system dynamically balances the battery temperature, improves system reliability and durability, ensures stable battery performance, reduces maintenance costs, and enhances the adaptability of the electric mixer truck to all working conditions.

[0018] 2. The electric mixer truck battery thermal management system of this utility model is based on the principle of refrigeration cycle. It utilizes the phase change of refrigerant to absorb a large amount of heat, which can efficiently and quickly transfer and dissipate heat, realize efficient heat dissipation of equipment, and meet the heat dissipation requirements of high-power and high-heat-density equipment.

[0019] 3. The electric mixer truck battery thermal management system of this utility model heats the heat transfer medium through a PTC heater, which can significantly increase the temperature of the heat transfer medium in a short time under extremely cold conditions, forming a stable heat source to heat the battery, improving the battery's usable capacity and power output, ensuring the electric mixer truck's low-temperature start-up and range capability, and enhancing the vehicle's adaptability to low-temperature environments. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the battery thermal management system for the electric mixer truck of this utility model.

[0022] In the diagram, 1 is the battery pack; 2 is the heat transfer module; 3 is the heating module; 4 is the cooling module; 21 is the pump; 22 is the expansion tank; 23 is the shut-off valve; 41 is the compressor; 42 is the condenser; 43 is the expansion valve; 44 is the heat exchanger; 45 is the temperature and pressure sensor; 46 is the dryer; 47 is the temperature sensor; and 48 is the gas-liquid separator. Detailed Implementation

[0023] The technical solutions in 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 a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0024] like Figure 1 As shown, an electric mixer truck battery thermal management system includes a battery pack 1, a heat transfer module 2, a heating module 3, and a cooling module 4. The battery pack 1 is provided with a battery sleeve 11, which is connected to the heat transfer module 2 by a pipe. The battery pack 1 and the heat transfer module 2 exchange heat. The heating module 3 provides a heat source for the heat transfer module 2, and the cooling module 4 provides a cold source for the heat transfer module 2. The cooling module 4 includes a compressor 41, a condenser 42, an expansion valve 43, and a heat exchanger 44.

[0025] The heat exchanger 44 is an indirect heat exchanger. The heat medium inlet and outlet of the heat exchanger 44 are connected to the heat transfer module 2 via pipelines. The refrigerant side of the heat exchanger 44, the compressor 41, the condenser 42 and the expansion valve 43 are connected in sequence via pipelines to form a closed loop.

[0026] When battery pack 1 needs cooling, heating module 3 is in standby mode, and cooling module 4 is activated. In cooling module 4, compressor 41 compresses the gaseous refrigerant into a high-temperature, high-pressure gaseous state, which is then sent to condenser 42 for cooling. The cooled refrigerant becomes a medium-temperature, high-pressure liquid. The high-pressure liquid refrigerant is then throttled and depressurized by expansion valve 43, becoming a low-temperature, low-pressure gas-liquid mixture. The liquid refrigerant absorbs heat from heat transfer module 2 through heat exchanger 44 and vaporizes into a gaseous state, cooling heat transfer module 2. The cooled heat transfer module 2 then transfers the cooling energy to battery pack 1, further cooling battery pack 1, thus forming a refrigeration cycle.

[0027] The cooling module 4 also includes a dryer 46, the inlet of which is connected to the outlet pipe of the condenser 42, and the outlet of the dryer 46 is connected to the inlet pipe of the expansion valve 43. The dryer 46 can filter out impurities that may be present in the refrigerant, preventing damage to the cooling module 4 and improving the cooling efficiency of the cooling module 4.

[0028] The cooling module 4 also includes a gas-liquid separator 48. The inlet of the gas-liquid separator 48 is connected to the heat medium outlet pipe of the heat exchanger 44, and the outlet of the gas-liquid separator 48 is connected to the inlet pipe of the compressor 41. The gas-liquid separator 48 can separate liquid refrigerant from gaseous refrigerant, reducing the load on the compressor 41 and thus improving the cooling efficiency of the cooling module 4.

[0029] A temperature and pressure sensor 45 is installed on the pipe between the outlet of condenser 42 and the inlet of dryer 46. The temperature and pressure sensor 45 is used to detect the temperature and pressure of the refrigerant in the outlet pipe of condenser 42.

[0030] A temperature sensor 47 is installed on the pipe between the refrigerant outlet of heat exchanger 44 and the inlet of gas-liquid separator 48. The temperature sensor 47 is used to detect the temperature of the refrigerant flowing out of heat exchanger 44.

[0031] The heat transfer module 2 includes a pump 21. The outlet of the pump 21, the battery sleeve 11, and the heat medium side of the heat exchanger 44 are connected in sequence through pipes to form a closed loop. On the one hand, the pump 21 can drive the medium in the heat transfer module 2 to circulate and avoid the accumulation of heat or cold. On the other hand, the pump 21 can regulate the flow rate of the medium in the heat transfer module 2, thereby improving the efficiency of heat exchange.

[0032] Heating module 3 includes a PTC heater. The inlet of the PTC heater is connected to the pipe of battery sleeve 11, and the outlet of the PTC heater is connected to the heat medium inlet pipe of heat exchanger 44. When battery pack 1 is too cold and needs to be heated, cooling module 4 is on standby or moderately adjusted to prevent overheating. In heating module 3, the PTC heater heats the medium in heat transfer module 2. When the temperature of the PTC heater rises, the resistance increases and the power automatically decreases to prevent overheating. The heated heat transfer module 2 then transports the heat to battery pack 1 to raise the temperature of battery pack 1, forming a heating cycle.

[0033] The heat transfer module 2 also includes an expansion tank 22. A main heat transfer pipe is formed between the outlet of the battery sleeve 11 and the inlet of the PTC heater. The inlet and outlet of the expansion tank 22 are connected to the main heat transfer pipe, and a bypass is formed between the expansion tank 22 and the main heat transfer pipe. The volume of the medium in the heat transfer module 2 changes with temperature; when the temperature rises, the liquid expands; when the temperature falls, the liquid contracts. The expansion tank can accommodate excess volume during liquid expansion and replenish coolant into the module during liquid contraction.

[0034] Three-way valves are installed at the connection points between the inlet and outlet of the expansion tank 22 and the heat transfer main pipe.

[0035] The main heat transfer pipe is located between the two three-way valves and is equipped with a shut-off valve 23. Air may be introduced into the heat transfer module 2 during initial coolant filling or operation. Air in the heat transfer module 2 will affect heat transfer efficiency. Some air enters the expansion tank 22 through the three-way valves, while some needs to be manually bleed. This involves closing the shut-off valve 23 and pump 21 to stop the circulation of the medium in the heat transfer module 2, and manually bleeding the air out of the heat transfer module 2. After bleeding, the shut-off valve 23 is reopened, and pump 21 is started to continue the heat transfer circulation, ensuring efficient system operation.

Claims

1. A battery thermal management system for an electric mixer truck, comprising a battery pack (1), a heat transfer module (2), a heating module (3), and a cooling module (4), wherein the battery pack (1) is provided with a battery sleeve (11) on its exterior, the battery sleeve (11) is connected to the heat transfer module (2) via a pipe, the battery pack (1) and the heat transfer module (2) exchange heat, the heating module (3) provides a heat source for the heat transfer module (2), and the cooling module (4) provides a cold source for the heat transfer module (2), characterized in that: The cooling module (4) includes a compressor (41), a condenser (42), an expansion valve (43), and a heat exchanger (44); The heat exchanger (44) is an indirect heat exchanger. The heat medium inlet and outlet of the heat exchanger (44) are connected to the heat transfer module (2) via pipelines. The refrigerant side of the heat exchanger (44), the compressor (41), the condenser (42) and the expansion valve (43) are connected in sequence via pipelines to form a closed loop.

2. The electric mixer truck battery thermal management system according to claim 1, characterized in that: The cooling module (4) also includes a dryer (46), the inlet of which is connected to the outlet pipe of the condenser (42), and the outlet of which is connected to the inlet pipe of the expansion valve (43).

3. The electric mixer truck battery thermal management system according to claim 1, characterized in that: The cooling module (4) also includes a gas-liquid separator (48), the inlet of which is connected to the heat medium outlet pipe of the heat exchanger (44), and the outlet of which is connected to the inlet pipe of the compressor (41).

4. The electric mixer truck battery thermal management system according to claim 2, characterized in that: A temperature and pressure sensor (45) is installed on the pipe between the outlet of the condenser (42) and the inlet of the dryer (46).

5. The electric mixer truck battery thermal management system according to claim 3, characterized in that: A temperature sensor (47) is installed on the pipe between the refrigerant outlet of the heat exchanger (44) and the inlet of the gas-liquid separator (48).

6. The electric mixer truck battery thermal management system according to claim 1, characterized in that: The heat transfer module (2) includes a pump (21), and the outlet of the pump (21), the battery sleeve (11), and the heat medium side of the heat exchanger (44) are connected in sequence to form a closed loop.

7. The electric mixer truck battery thermal management system according to claim 1, characterized in that: The heating module (3) includes a PTC heater, the inlet of which is connected to the battery sleeve (11) pipe, and the outlet of which is connected to the heat medium inlet pipe of the heat exchanger (44).

8. The electric mixer truck battery thermal management system according to claim 7, characterized in that: The heat transfer module (2) also includes an expansion tank (22). The pipe between the outlet of the battery sleeve (11) and the inlet of the PTC heater forms a heat transfer main pipe. The inlet and outlet of the expansion tank (22) are respectively connected to the heat transfer main pipe. The expansion tank (22) and the heat transfer main pipe form a bypass between each other.

9. The electric mixer truck battery thermal management system according to claim 8, characterized in that: The expansion tank (22) is equipped with three-way valves at the connection points between its inlet and outlet and the heat transfer main pipe.

10. The electric mixer truck battery thermal management system according to claim 9, characterized in that: The heat transfer main pipe is located between two three-way valves and is also equipped with a shut-off valve (23).

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