阅读说明：本技术 一种风冷电池包热管理系统 (Air-cooled battery pack thermal management system ) 是由 赵晓凤 卢佳 王朝 郭艳萍 刘孝禹 于 2021-09-07 设计创作，主要内容包括：本发明公开了一种风冷电池包热管理系统,该系统包括：换热回路,包括相互串联形成回路的冷凝器、压缩机、蒸发器以及膨胀阀；乘员舱空调管路,包括与所述冷凝器以及蒸发器相邻设置的风扇以及第一风道；电池包空调管路,包括与所述冷凝器以及蒸发器相邻设置的抽风机以及第二风道；控制模块,利用控制算法,根据乘员舱和电池包的温度、乘员舱的设定温度,控制换热回路、风扇以及抽风机,以一定的控制逻辑实现对乘员舱和电池包的制热或制冷。本发明实现了电池风冷系统的结构简化,并满足电池包的制热和制冷需求。(The invention discloses a heat management system for an air-cooled battery pack, which comprises: the heat exchange loop comprises a condenser, a compressor, an evaporator and an expansion valve which are mutually connected in series to form a loop; the passenger compartment air conditioning pipeline comprises a fan and a first air channel which are arranged adjacent to the condenser and the evaporator; the battery pack air conditioning pipeline comprises an exhaust fan and a second air duct which are arranged adjacent to the condenser and the evaporator; and the control module controls the heat exchange loop, the fan and the exhaust fan according to the temperature of the passenger cabin and the battery pack and the set temperature of the passenger cabin by using a control algorithm, and realizes heating or cooling of the passenger cabin and the battery pack by using a certain control logic. The invention simplifies the structure of the battery air cooling system and meets the heating and refrigerating requirements of the battery pack.)

1. The utility model provides an air-cooled battery package thermal management system which characterized in that: the system comprises:

the heat exchange loop comprises a condenser, a compressor, an evaporator and an expansion valve which are mutually connected in series to form a loop and is used for heat exchange to heat or refrigerate;

the passenger compartment air conditioning pipeline comprises a fan and a first air channel which are arranged adjacent to the condenser and the evaporator and is used for heating or refrigerating the passenger compartment; the air outlet of the fan is connected with a first air channel, the first air channel is connected with the passenger cabin, and the fan blows hot air or cold air generated by the condenser or the evaporator into the first air channel and sends the hot air or the cold air into the passenger cabin through the first air channel;

the battery pack air conditioning pipeline comprises an exhaust fan and a second air duct which are arranged adjacent to the condenser and the evaporator and is used for heating or refrigerating the battery pack; the air outlet of the exhaust fan is connected with a second air duct, the second air duct is connected with the battery pack, and the exhaust fan blows hot air or cold air generated by the condenser or the evaporator into the second air duct and sends the hot air or the cold air to the battery pack through the second air duct;

and the control module controls the heat exchange loop, the fan and the exhaust fan according to the temperature of the passenger cabin and the battery pack and the set temperature of the passenger cabin by using a control algorithm, and realizes heating or cooling of the passenger cabin and the battery pack by using a certain control logic.

2. The air-cooled battery pack thermal management system of claim 1, wherein: the control module realizes the control of the temperature in the passenger compartment by changing the power of the fan; the control module realizes the control of the temperature of the battery pack by changing the duty ratio of the exhaust fan.

3. The air-cooled battery pack thermal management system of claim 1, wherein: the control algorithm is specifically as follows:

when the heat exchange loop carries out refrigeration, the temperature of the battery pack is judged firstly, and if the temperature of the battery pack exceeds a refrigeration temperature threshold T_coldIf the battery pack is cooled preferentially, the duty ratio of the exhaust fan is increased to P₁The power of the fan is reduced to Q₁Until the temperature of the battery pack drops below T_cold-T_hysWhen the duty ratio of the exhaust fan is reduced to P₂While the power of the fan is increased to Q₂Until the temperature in the passenger compartment reaches the set temperature; wherein T is_hyIs the hysteresis temperature;

when the heat exchange loop heats, the temperature of the battery pack is judged firstly, and if the temperature of the battery pack is lower than a heating temperature threshold T_heatWhen the battery pack is heated, the battery pack is preferentially heated, and the duty ratio of the exhaust fan is increasedRise to P₃The power of the fan is reduced to Q₃Until the temperature of the battery pack rises above T_heatWhen the duty ratio of the exhaust fan is reduced to P₄While the power of the fan is increased to Q₄Until the temperature in the passenger compartment reaches the set temperature.

4. An air-cooled battery pack thermal management method implemented by the air-cooled battery pack thermal management system according to claims 1 to 3, characterized in that:

when the heat exchange loop carries out refrigeration, the temperature of the battery pack is judged firstly, and if the temperature of the battery pack exceeds a refrigeration temperature threshold T_coldIf the battery pack is cooled preferentially, the duty ratio of the exhaust fan is increased to P₁The power of the fan is reduced to Q₁Until the temperature of the battery pack drops below T_cold-T_hysWhen the duty ratio of the exhaust fan is reduced to P₂While the power of the fan is increased to Q₂Until the temperature in the passenger compartment reaches the set temperature; wherein T is_hysIs the hysteresis temperature;

when the heat exchange loop heats, the temperature of the battery pack is judged firstly, and if the temperature of the battery pack is lower than a heating temperature threshold T_heatWhen the battery pack is heated, the battery pack is preferentially heated, and the duty ratio of the exhaust fan is increased to P₃The power of the fan is reduced to Q₃Until the temperature of the battery pack rises above T_heatWhen the duty ratio of the exhaust fan is reduced to P₄While the power of the fan is increased to Q₄Until the temperature in the passenger compartment reaches the set temperature.

5. A computer device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein: the steps of the air-cooled battery pack thermal management method of claim 4 are implemented when the computer program is executed by the processor.

6. A computer-readable storage medium having stored thereon a computer program which, when executed by a processor, carries out the steps of the air-cooled battery pack thermal management method of claim 4.

Technical Field

The invention relates to the field of automobile battery thermal management, in particular to an air-cooled battery pack thermal management system.

Background

At present, the power source of an electric vehicle is mainly a power battery pack mounted on the vehicle, and the power battery pack is generally composed of a plurality of lithium ion batteries. Due to the chemical characteristics of the lithium ion battery, the charging and discharging current is limited at low or high temperature, and the health condition of the battery is influenced, so that the lithium ion battery is ensured to work in a comfortable temperature range. The air cooling system is widely applied to hybrid electric vehicles and pure electric vehicles as a technology for battery thermal management. The air-cooled battery pack is applied to an air-cooled battery system in a hybrid electric vehicle, and the battery pack is relatively high in charging and discharging current and relatively sensitive to the ambient temperature, so that the heat management system of the air-cooled battery pack and the control method thereof are important.

In the existing air-cooled battery pack heat management system, air ducts are generally distributed around a battery pack, and air in a passenger compartment is introduced into an air duct circulating system through equipment such as a fan, so that the battery system is cooled or heated. The method causes that the temperature of circulating air in the air duct circulating system is seriously dependent on the temperature of a passenger cabin, and the battery pack cannot be cooled or heated preferentially under certain special working conditions, such as extremely high temperature or extremely low temperature, when the battery pack needs to be cooled or heated preferentially.

Disclosure of Invention

The invention aims to provide an air-cooled battery pack heat management system, which is used for simplifying the structure of a battery air-cooled system and meeting the heating and refrigerating requirements of a battery pack.

In order to solve the technical problem, the invention provides a technical scheme that: an air-cooled battery pack thermal management system: the system comprises:

the heat exchange loop comprises a condenser, a compressor, an evaporator and an expansion valve which are mutually connected in series to form a loop and is used for heat exchange to heat or refrigerate;

the passenger compartment air conditioning pipeline comprises a fan and a first air channel which are arranged adjacent to the condenser and the evaporator and is used for heating or refrigerating the passenger compartment; the air outlet of the fan is connected with a first air channel, the first air channel is connected with the passenger cabin, and the fan blows hot air or cold air generated by the condenser or the evaporator into the first air channel and sends the hot air or the cold air into the passenger cabin through the first air channel;

the battery pack air conditioning pipeline comprises an exhaust fan and a second air duct which are arranged adjacent to the condenser and the evaporator and is used for heating or refrigerating the battery pack; the air outlet of the exhaust fan is connected with a second air duct, the second air duct is connected with the battery pack, and the exhaust fan blows hot air or cold air generated by the condenser or the evaporator into the second air duct and sends the hot air or the cold air to the battery pack through the second air duct;

and the control module controls the heat exchange loop, the fan and the exhaust fan according to the temperature of the passenger cabin and the battery pack and the set temperature of the passenger cabin by using a control algorithm, and realizes heating or cooling of the passenger cabin and the battery pack by using a certain control logic.

According to the scheme, the control module controls the temperature in the passenger compartment by changing the power of the fan; the control module realizes the control of the temperature of the battery pack by changing the duty ratio of the exhaust fan.

According to the scheme, the control algorithm is as follows:

when the heat exchange loop carries out refrigeration, the temperature of the battery pack is judged firstly, and if the temperature of the battery pack exceeds a refrigeration temperature threshold T_coldIf the battery pack is cooled preferentially, the duty ratio of the exhaust fan is increased to P₁The power of the fan is reduced to Q₁Until the temperature of the battery pack drops below T_cold-T_hysWhen the duty ratio of the exhaust fan is reduced to P₂While the power of the fan is increased to Q₂Until the temperature in the passenger compartment reaches the set temperature; wherein T is_hyIs the hysteresis temperature;

when the heat exchange loop heats, the temperature of the battery pack is judged firstly, and if the temperature of the battery pack is lower than a heating temperature threshold T_heaWhen the battery pack is heated, the battery pack is preferentially heated, and the duty ratio of the exhaust fan is increased to P₃The power of the fan is reduced to Q₃Until the temperature of the battery pack rises above T_heatWhen the duty ratio of the exhaust fan is reduced to P₄While the power of the fan is increased to Q₄Up to the temperature in the passenger compartmentAnd the temperature reaches the set temperature.

A heat management method for an air-cooled battery pack comprises the following steps:

when the heat exchange loop carries out refrigeration, the temperature of the battery pack is judged firstly, and if the temperature of the battery pack exceeds a refrigeration temperature threshold T_coldIf the battery pack is cooled preferentially, the duty ratio of the exhaust fan is increased to P₁The power of the fan is reduced to Q₁Until the temperature of the battery pack drops below T_cold-T_hysWhen the duty ratio of the exhaust fan is reduced to P₂While the power of the fan is increased to Q₂Until the temperature in the passenger compartment reaches the set temperature; wherein T is_hysIs the hysteresis temperature;

when the heat exchange loop heats, the temperature of the battery pack is judged firstly, and if the temperature of the battery pack is lower than a heating temperature threshold T_heatWhen the battery pack is heated, the battery pack is preferentially heated, and the duty ratio of the exhaust fan is increased to P₃The power of the fan is reduced to Q₃Until the temperature of the battery pack rises above T_heatWhen the duty ratio of the exhaust fan is reduced to P₄While the power of the fan is increased to Q₄Until the temperature in the passenger compartment reaches the set temperature.

A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the air-cooled battery pack thermal management method as described above when executing the computer program.

A computer-readable storage medium, having stored thereon a computer program which, when executed by a processor, carries out the steps of the air-cooled battery pack thermal management method as described above.

The invention has the beneficial effects that: the exhaust fan arranged adjacent to the condenser and the evaporator is arranged, the second air channel is arranged to connect the exhaust fan and the battery pack, and the second air channel is not communicated with the air conditioning pipeline of the passenger cabin, so that the independent regulation of the temperature of the passenger cabin and the temperature of the battery pack is realized, and the dependence of the temperature of the battery on the temperature of the passenger cabin in the prior art is avoided; and this system has only added air exhauster and second wind channel on the original temperature regulation system of car, compares in the mode of adding independent temperature control system to the battery package, has simplified the structure of whole system greatly.

Furthermore, through a control method arranged in the control module, the battery pack is preferentially heated or cooled, and the temperature requirement of the passenger compartment is met.

Drawings

Fig. 1 is a schematic diagram of an air-cooled battery pack thermal management system according to an embodiment of the invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings of the embodiments of the present disclosure. It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of protection of the disclosure.

An air-cooled battery pack thermal management system: the system comprises:

the heat exchange loop comprises a condenser, a compressor, an evaporator and an expansion valve which are mutually connected in series to form a loop and is used for heat exchange to heat or refrigerate;

the passenger compartment air conditioning pipeline comprises a fan and a first air channel which are arranged adjacent to the condenser and the evaporator and is used for heating or refrigerating the passenger compartment; the air outlet of the fan is connected with a first air channel, the first air channel is connected with the passenger cabin, and the fan blows hot air or cold air generated by the condenser or the evaporator into the first air channel and sends the hot air or the cold air into the passenger cabin through the first air channel;

the battery pack air conditioning pipeline comprises an exhaust fan and a second air duct which are arranged adjacent to the condenser and the evaporator and is used for heating or refrigerating the battery pack; the air outlet of the exhaust fan is connected with a second air duct, the second air duct is connected with the battery pack, and the exhaust fan blows hot air or cold air generated by the condenser or the evaporator into the second air duct and sends the hot air or the cold air to the battery pack through the second air duct;

and the control module controls the heat exchange loop, the fan and the exhaust fan according to the temperature of the passenger cabin and the battery pack and the set temperature of the passenger cabin by using a control algorithm, and realizes heating or cooling of the passenger cabin and the battery pack by using a certain control logic.

According to the scheme, the control module controls the temperature in the passenger compartment by changing the power of the fan; the control module realizes the control of the temperature of the battery pack by changing the duty ratio of the exhaust fan.

According to the scheme, the control algorithm is as follows:

when the heat exchange loop carries out refrigeration, the temperature of the battery pack is judged firstly, and if the temperature of the battery pack exceeds a refrigeration temperature threshold T_coldIf the battery pack is cooled preferentially, the duty ratio of the exhaust fan is increased to P₁The power of the fan is reduced to Q₁Until the temperature of the battery pack drops below T_cold-T_hysWhen the duty ratio of the exhaust fan is reduced to P₂While the power of the fan is increased to Q₂Until the temperature in the passenger compartment reaches the set temperature; wherein T is_hysIs the hysteresis temperature;

when the heat exchange loop heats, the temperature of the battery pack is judged firstly, and if the temperature of the battery pack is lower than a heating temperature threshold T_heatWhen the battery pack is heated, the battery pack is preferentially heated, and the duty ratio of the exhaust fan is increased to P₃The power of the fan is reduced to Q₃Until the temperature of the battery pack rises above T_heatWhen the duty ratio of the exhaust fan is reduced to P₄While the power of the fan is increased to Q₄Until the temperature in the passenger compartment reaches the set temperature.

A heat management method for an air-cooled battery pack comprises the following steps:

when the heat exchange loop carries out refrigeration, the temperature of the battery pack is judged firstly, and if the temperature of the battery pack exceeds a refrigeration temperature threshold T_coldIf the battery pack is cooled preferentially, the duty ratio of the exhaust fan is increased to P₁The power of the fan is reduced to Q₁Until the temperature of the battery pack drops below T_cold-T_hysWhen the duty ratio of the exhaust fan is reduced to P₂While the power of the fan is increased to Q₂Until the temperature in the passenger compartment reaches the set temperature; wherein T is_hysIs the hysteresis temperature;

when the heat exchange loop heats, the temperature of the battery pack is judged firstly, and if the temperature of the battery pack is lower than a heating temperature threshold T_heWhen the battery pack is heated, the battery pack is preferentially heated, and the duty ratio of the exhaust fan is increased to P₃The power of the fan is reduced to Q₃Until the temperature of the battery pack rises above T_heatWhen the duty ratio of the exhaust fan is reduced to P₄While the power of the fan is increased to Q₄Until the temperature in the passenger compartment reaches the set temperature.

A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the air-cooled battery pack thermal management method as described above when executing the computer program.

A computer-readable storage medium, having stored thereon a computer program which, when executed by a processor, carries out the steps of the air-cooled battery pack thermal management method as described above.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.