New energy automobile battery system

Abstract

A new energy automobile battery system relates to a battery system and comprises a battery pack and a battery management system, the battery pack comprises a battery module and a control circuit thereof, and the battery management system comprises a main controller, a temperature sensor, a flow regulating valve, a circulating pump, a heater, a refrigeration unit and a composite phase change material; the temperature sensors are distributed at different positions of a battery module in the battery pack and are connected with a signal input end of the main controller; the flow regulating valve is mounted on a cooling medium conveying pipeline of the battery pack, and the cooling medium conveying pipeline is connected with the output end of the circulating pump; the heater and the refrigeration unit are respectively arranged on the cooling medium conveying pipeline; the signal input ends of the heater, the refrigerating unit, the flow regulating valve and the circulating pump are respectively connected with the signal output end of the main controller; and the composite phase change material is filled among the battery modules. According to the utility model, the reliability and durability of the battery can be improved; the energy loss is reduced, the endurance mileage is improved, and the failure rate and the maintenance cost are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery system, in particular to a new energy automobile battery system. BACKGROUND

[0002] With the rapid growth of new energy automobile market, the requirement of electric automobile battery performance is also increasing. As one of the core components of new energy automobile, the working efficiency of battery is directly affected by the environment temperature. High temperature can cause battery capacity to decline, and even cause safety risk; while low temperature can slow down battery charging speed and reduce discharge capacity. Therefore, how to effectively control battery temperature, and how to ensure battery health and delay battery life become the focus of current research. The mainstream battery temperature control scheme in the current market mainly includes air cooling, liquid cooling and phase change material cooling three ways. Among them, the air cooling system has simple structure and low cost, but the heat dissipation effect is limited under high load working condition; the liquid cooling system has strong heat dissipation capacity and high energy efficiency, but increases the weight of the whole vehicle and has high maintenance complexity; the phase change material is also applied to the inside of battery pack due to its unique energy storage characteristics, but its slow heat transfer rate limits the rapid response capability. These problems directly affect the overall performance of new energy automobile and user experience.

[0003] In addition, the existing electric automobile battery control circuit is not perfect enough in protection during overcharge and overdischarge of the battery, which can easily cause damage to the battery and affect the service life. The energy optimization management of the control circuit is insufficient, which can easily cause high power loss. The suppression of noise and electromagnetic interference in the circuit design is not enough, which can easily cause signal distortion or unstable control. SUMMARY

[0004] The technical problem to be solved by the utility model is to provide a new energy automobile battery system to solve the problems of limited heat dissipation effect, heavy weight of the whole vehicle, high maintenance complexity and influence on battery service life in the prior art.

[0005] The technical scheme for solving the above technical problems is as follows: a new energy automobile battery system, comprising a battery pack and a battery management system, wherein the battery pack comprises a battery module and a control circuit thereof, and the battery management system comprises a main controller, a temperature sensor, a flow regulating valve, a circulating pump, a heater, a refrigeration unit and a composite phase change material; the temperature sensor is distributed at different positions of the battery module in the battery pack, and the signal output end of the temperature sensor is connected with the signal input end of the main controller; the flow regulating valve is installed on the cooling medium conveying pipeline of the battery pack, and the cooling medium conveying pipeline is connected with the output end of the circulating pump; the heater and the refrigeration unit are respectively installed on the cooling medium conveying pipeline; the signal input ends of the heater, the refrigeration unit, the flow regulating valve and the circulating pump are respectively connected with the signal output end of the main controller; and the composite phase change material is filled between the battery modules of the battery pack.

[0006] A further technical solution of this utility model is as follows: the control circuit of the battery module includes a protection circuit module and a voltage regulator circuit module. The voltage regulator circuit module includes a voltage regulator module and an auxiliary voltage regulator module. After the power is input, the protection circuit module protects the input voltage from reverse connection and fluctuations, and then transmits it to the voltage regulator module of the voltage regulator circuit module to regulate the voltage output. The voltage is then further reduced by the auxiliary voltage regulator module to supply power to low-voltage equipment. The regulated voltage is smoothed by the filter module, and finally provides stable and reliable power support for the drive circuit and the load circuit.

[0007] A further technical solution of this utility model is: the protection circuit module is composed of diodes and filter capacitors, the voltage regulation module includes a TLE4275 low dropout voltage regulator, and the auxiliary voltage regulation module includes an LM111 voltage regulator.

[0008] A further technical solution of this utility model is: the composite phase change material is selected from paraffin-based mixtures with a melting point range of 45°C to 55°C.

[0009] A further technical solution of this utility model is: the main controller adopts an ARM Cortex-M series microcontroller.

[0010] A further technical solution of this utility model is: the temperature sensor model is NTC10K-50℃~150℃, with an accuracy of ±0.5℃.

[0011] A further technical solution of this utility model is: the flow regulating valve is an electric ball valve with a response time of <0.5s and a maximum pressure difference of 1MPa.

[0012] A further technical solution of this utility model is: the circulating pump is a DC permanent magnet brushless water pump.

[0013] A further technical solution of this utility model is that the heater is a PTC ceramic heating element.

[0014] A further technical solution of this utility model is: the refrigeration unit adopts a compressor with a refrigeration mode and a heating capacity of 1-2kW.

[0015] Due to the above structure, the new energy vehicle battery system of this utility model has the following advantages compared with the prior art:

[0016] 1. Good heat dissipation

[0017] The battery management system of this invention includes a main controller, a temperature sensor, a flow regulating valve, a circulating pump, a heater, a cooling unit, and a composite phase change material. The cooling unit is installed on a cooling medium delivery pipeline, and the composite phase change material is filled between the battery modules of the battery pack. This invention dissipates heat through the cooling unit and incorporates a composite phase change material with good heat transfer properties as an auxiliary cooling tool, resulting in good heat dissipation.

[0018] 2. It can reduce the overall vehicle weight, thereby reducing the failure rate and maintenance costs.

[0019] This invention eliminates the need for a liquid cooling system, simplifying the system architecture, reducing vehicle weight, and decreasing failure rate and maintenance costs.

[0020] 3. Fast heat transfer rate

[0021] The phase change material used to fill the battery modules in the battery pack is a composite phase change material. This composite phase change material is a paraffin-based mixture, which has a relatively fast heat transfer rate.

[0022] 4. Can extend battery life

[0023] This invention employs advanced sensing technology and an intelligent control system, and incorporates high-efficiency composite phase change materials as an auxiliary cooling tool, achieving more precise and efficient temperature control of the power battery module for new energy vehicles. This improves the reliability and durability of the battery under extreme weather conditions and can greatly extend the battery's lifespan.

[0024] In addition, this invention provides reverse connection protection through the diodes in the protection circuit module, while the filter capacitor effectively smooths the input voltage, preventing the battery from being damaged by voltage fluctuations or reverse current, thus ensuring battery health and further extending battery life.

[0025] 5. Can improve the driving range of new energy vehicles.

[0026] This invention, through sensing technology and intelligent control system, can achieve more precise and efficient temperature control of the power battery module of new energy vehicles, reduce energy loss caused by overheating, and improve the driving range of new energy vehicles.

[0027] 6. Reliable performance

[0028] This invention utilizes a voltage regulator module within the battery module control circuit to provide a stable power supply to the drive circuit, enhancing circuit safety. This voltage regulator module employs a TLE4275 low-dropout regulator and an LM111 regulator to stabilize the input voltage output at 5V and 3.3V, ensuring that the drive circuit and load circuit operate within a stable voltage range and preventing damage or malfunctions caused by voltage fluctuations. Its performance is relatively reliable.

[0029] 7. Can enhance user experience

[0030] This invention employs sensing technology and an intelligent control system, which can significantly improve the battery's performance under various operating conditions. After multiple tests, this invention demonstrates excellent compatibility and robustness, effectively ensuring that the battery module is in optimal working condition regardless of whether it is in severe cold or scorching heat, extending its service life while enhancing the safety and comfort of the driving experience.

[0031] The technical features of a new energy vehicle battery system of this utility model will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0032] Figure 1 : A structural block diagram of the battery management system described in Embodiment 1.

[0033] Figure 2 : Schematic diagram of the control circuit of the battery module described in Example 1. Detailed Implementation

[0034] Example 1

[0035] A new energy vehicle battery system includes a battery pack and a battery management system, wherein:

[0036] The battery pack includes a battery module and its control circuit. The control circuit of the battery module includes a protection circuit module and a voltage regulator module. The protection circuit module consists of diodes D1, D2, and D3, and filter capacitors C1 and C2. The voltage regulator module includes a voltage regulator module and an auxiliary voltage regulator module; the voltage regulator module includes a TLE4275 low-dropout regulator, and the auxiliary voltage regulator module includes an LM111 regulator. After power input, the protection circuit module provides reverse connection and fluctuation protection for the input voltage, which is then passed to the voltage regulator module to regulate the output voltage. The auxiliary voltage regulator module further reduces the voltage to 3.3V to power low-voltage equipment. The regulated voltage is smoothed by the filter module, ultimately providing stable and reliable power support for the drive circuit and load circuit. The diodes in the protection circuit module provide reverse connection protection, while the filter capacitors effectively smooth the input voltage, preventing damage to the battery from voltage fluctuations or reverse current, thereby extending battery life. The TLE4275 voltage regulator and LM111 voltage regulator in the voltage regulation circuit module can stably output the input voltage to 5V and 3.3V, ensuring that the load circuit and drive module operate within a stable voltage range, avoiding damage or abnormalities caused by voltage fluctuations, thereby enhancing the safety of the circuit.

[0037] The battery management system comprises a main controller, temperature sensors, flow control valves, a circulating pump, heaters, a cooling unit, and a composite phase change material. The main controller receives data from the temperature sensors and sends instructions to other components to adjust their operating states based on preset logic. The temperature sensors are distributed at different locations within the battery modules to monitor local temperature rises in real time; their signal outputs are connected to the main controller's signal inputs. The flow control valves are installed on the cooling medium delivery pipeline of the battery pack to precisely control the flow path and volume of the cooling medium. The output of the circulating pump is connected to the cooling medium delivery pipeline to drive the liquid along a designated route. The heaters and cooling units are installed on the cooling medium delivery pipeline to respectively handle winter insulation and summer cooling tasks; the signal inputs of the heaters, cooling units, flow control valves, and circulating pumps are connected to the main controller's signal outputs. The composite phase change material is filled between the battery modules of the battery pack. As a novel heat storage carrier, this composite phase change material can absorb or release heat within a specific range, achieving a smooth temperature curve.

[0038] The main controller uses an ARM Cortex-M series microcontroller, which has powerful data processing capabilities and low power consumption. The temperature sensor is an NTC10K model with an accuracy of ±0.5℃ and high sensitivity. The flow control valve is a DN15 electric ball valve with a response time of <0.5s and a maximum pressure difference of 1MPa. The circulating pump is a DC permanent magnet brushless water pump with a rated power of 60W, a head of 10m, and a flow rate of 12L / min. The heater is a PTC ceramic heating element with uniform and controllable power density. The refrigeration unit uses a small compressor refrigeration mode with a heating capacity of 1kW. The composite phase change material is a paraffin-based mixture with a melting point range of 45°C to 55°C and a latent heat value of approximately 200J / g, exhibiting excellent thermal conductivity and chemical stability.

[0039] The working process of the battery management system of this utility model is as follows:

[0040] When the vehicle starts, the main controller first checks whether all sensors are functioning properly, and then initializes each actuator. During operation, if the temperature in any area exceeds a set threshold, the corresponding heating or cooling module immediately activates until the temperature returns to a safe range. Simultaneously, the composite phase change material automatically participates in the regulation process using its energy storage function, helping to maintain the overall temperature field balance. Furthermore, dynamic control of fluid flow can further enhance heat exchange efficiency and reduce the probability of reaction lag.

Claims

1. A new energy vehicle battery system, comprising a battery pack and a battery management system, wherein the battery pack includes battery modules and their control circuits, characterized in that: The battery management system includes a main controller, temperature sensors, a flow regulating valve, a circulating pump, a heater, a cooling unit, and a composite phase change material. The temperature sensors are distributed at different locations within the battery modules of the battery pack, and their signal output terminals are connected to the signal input terminals of the main controller. The flow regulating valve is installed on the cooling medium delivery pipeline of the battery pack, and the cooling medium delivery pipeline is connected to the output terminal of the circulating pump. The heater and the cooling unit are respectively installed on the cooling medium delivery pipeline. The signal input terminals of the heater, the cooling unit, the flow regulating valve, and the circulating pump are respectively connected to the signal output terminals of the main controller. The composite phase change material is filled between the battery modules of the battery pack.

2. The new energy vehicle battery system according to claim 1, characterized in that: The control circuit of the battery module includes a protection circuit module and a voltage regulator circuit module. The voltage regulator circuit module includes a voltage regulator module and an auxiliary voltage regulator module. After the power is input, the protection circuit module protects the input voltage from reverse connection and fluctuations, and then the voltage is passed to the voltage regulator module of the voltage regulator circuit module to regulate the voltage output. The voltage is then further reduced by the auxiliary voltage regulator module to supply power to low-voltage equipment.

3. A new energy vehicle battery system according to claim 2, characterized in that: The protection circuit module consists of three diodes and two filter capacitors, the voltage regulator module includes a TLE4275 low-dropout regulator, and the auxiliary voltage regulator module includes an LM111 regulator.

4. A new energy vehicle battery system according to claim 1, characterized in that: The composite phase change material is a paraffin-based mixture with a melting point between 45°C and 55°C.

5. A new energy vehicle battery system according to claim 1, characterized in that: The main controller uses an ARM Cortex-M series microcontroller.

6. A new energy vehicle battery system according to claim 1, characterized in that: The temperature sensor model selected is NTC10K-50℃~150℃, with an accuracy of ±0.5℃.

7. A new energy vehicle battery system according to claim 1, characterized in that: The flow regulating valve is an electric ball valve with a response time of <0.5s and a maximum pressure difference of 1MPa.

8. A new energy vehicle battery system according to claim 1, characterized in that: The circulating pump is a DC permanent magnet brushless water pump.

9. A new energy vehicle battery system according to claim 1, characterized in that: The heater is a PTC ceramic heating element.

10. A new energy vehicle battery system according to claim 1, characterized in that: The refrigeration unit uses a compressor with a refrigeration mode and has a heating capacity of 1-2 kW.

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