CN214797543U - Variable-power low-temperature heating system with temperature protection function - Google Patents
Variable-power low-temperature heating system with temperature protection function Download PDFInfo
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Abstract
The utility model relates to a power battery heating field, in particular to take temperature protect function's variable power low temperature heating system. The variable-power low-temperature heating system with the temperature protection function comprises: the device comprises a battery pack, a module temperature acquisition unit, a heating unit temperature acquisition unit, a power switch and a heating system control unit; the module temperature acquisition unit is used for: collecting the temperature of the single batteries in the battery module correspondingly arranged; the heating unit temperature acquisition unit is used for acquiring the temperature of the heating unit; the heating system control unit is used for: and issuing an instruction to the power switch according to the temperature difference between the heating unit and the single battery. Through the system, the temperature difference between the heating unit and the single battery can be obtained, and an instruction is sent to the power switch according to the temperature difference, so that the power switch heats the battery module by using different heating powers, personalized heating is achieved, unnecessary heating energy consumption is reduced, and the service life of the battery module is prolonged.
Description
Technical Field
The utility model relates to a power battery heating field, in particular to take temperature protect function's variable power low temperature heating system.
Background
With the popularization of electric vehicles, the research on the charging safety and energy consumption saving of power batteries is more and more.
The more typical patents disclosed so far are: a heating method, a device and a system (publication number: CN105720320A) of an automobile lithium battery only mention the reasonable arrangement of a power resistance unit or an electric heating film material in a battery pack, do not mention the concept of a temperature equalizing heating system, and do not mention how to arrange the power of the power resistance unit or the electric heating film material.
A low-temperature charging and heating system (publication number: CN105870542A) for power batteries ensures that a power battery module is uniformly heated by arranging a PTC heating plate at a low-temperature region of the module and adjusting the current in a heating loop, and reduces the temperature difference between the power battery module and parts thereof.
A heating method and a device (publication number: CN106058384A) of a power battery realize the reduction of the temperature difference of the power battery by a method of heating by front and back zone control.
In the patent (publication number: CN107317066A), temperature difference balance is realized by an intermittent heating method, which easily causes the relay to reach the service life and causes the heating function of the system to be invalid or increases the after-sale maintenance cost, and meanwhile, the proposal does not consider the influence of the temperature difference between a heating component and a battery on the heating efficiency, so that the energy consumption is larger;
disadvantage 5: the patent (publication number: CN107834120A) heats the power battery by different powers in a segmented manner, so that the heat distribution of the power battery is relatively uniform in the heating process, the scheme refers to the average temperature of the power battery, the influence of the temperature difference between a heating assembly and the power battery on the heating efficiency is not considered, the heating efficiency is general, and the scheme only uses limited groups of heating powers and consumes general energy;
disadvantage 6: in the above patents, no consideration is given to adding a temperature acquisition device in the heating unit, and the heating system lacks a safety protection function, which brings a certain potential safety hazard to the low-temperature heating system;
disadvantage 7: in the above patents, how to control the temperature difference inside the battery in the heating process is not clear, and in the actual process, if the temperature difference between the heating unit and the battery is large, the temperature difference inside the battery is large, and the heating system influences the service life of the battery to a certain extent;
it can be seen from the above that no technology exists at present which can solve the problem of the influence of the temperature difference between the power battery and the heating assembly on the heating efficiency and the heating energy consumption.
SUMMERY OF THE UTILITY MODEL
Therefore, a variable-power low-temperature heating system with a temperature protection function is needed to be provided, so as to solve the problem that the temperature difference between the power battery and the heating assembly affects the heating efficiency and the heating energy consumption. The specific technical scheme is as follows:
a variable power low temperature heating system with temperature protection function comprises: the system comprises a battery pack, a module temperature acquisition unit, a heating unit temperature acquisition unit, a power switch, a heating system control unit and an environment temperature acquisition unit;
the battery pack is composed of more than two battery modules;
the battery module consists of more than two single batteries;
the module temperature acquisition unit set up in on the battery module, the module temperature acquisition unit is used for: collecting the temperature of the single batteries in the battery module correspondingly arranged;
the heating unit is arranged at the bottom or the side of the battery module;
a thermal interface material is filled between the heating unit and the battery module;
the heating unit temperature acquisition unit is arranged on the heating unit with the power density larger than a first preset threshold value and is used for acquiring the temperature of the heating unit;
the heating system control unit is configured to: issuing an instruction to a power switch according to the temperature difference between the temperature of the heating unit and the temperature of the single battery;
the power switch is used for: adjusting the heating power of the battery module through PWM;
the ambient temperature acquisition unit is used for: collecting the ambient temperature;
the heating system control unit is further configured to: and issuing an instruction to a power switch according to the temperature difference between the ambient temperature and the temperature of the single battery.
Further, the method also comprises the following steps: a battery pack main positive relay and/or a battery pack main negative relay;
the battery pack main positive relay is used for: when the active heat preservation function is started, the battery pack is subjected to heat preservation by matching with the main and negative relays of the battery pack and the power switch;
the battery pack main and negative relays are used for: when the active heat preservation function is started, the battery pack is subjected to heat preservation by matching with the main positive relay and the power switch of the battery pack.
Further, the single battery includes, but is not limited to: the power battery comprises a soft package power battery, a square power battery and a cylindrical power battery;
the module temperature acquisition unit is a negative temperature coefficient thermistor;
the heating unit temperature acquisition unit is a negative temperature coefficient thermistor;
the heating unit is an electrical heating unit, and the heating unit includes but is not limited to: a silica gel heating plate, a mica plate heating plate and a polyimide heating film;
the thermal interface materials include, but are not limited to: a heat conductive pad, a heat conductive grease, a material having a filling heat conductive property;
the power switch is a high-power switch type semiconductor device, and the power switch comprises but is not limited to: silicon controlled power switch, IGBT power switch, MOSFET power switch.
Furthermore, the heating units are connected in series to form a heating loop, the heating loop is connected with the battery pack in parallel, and the heating loop is connected with the vehicle-mounted charger in parallel.
Furthermore, the fuse wire device further comprises a heating fuse wire which is a fuse link.
The utility model has the advantages that: a variable power low temperature heating system with temperature protection function is characterized by comprising: the system comprises a battery pack, a module temperature acquisition unit, a heating unit temperature acquisition unit, a power switch, a heating system control unit and an environment temperature acquisition unit; the battery pack is composed of more than two battery modules; the battery module consists of more than two single batteries; the module temperature acquisition unit set up in on the battery module, the module temperature acquisition unit is used for: collecting the temperature of the single batteries in the battery module correspondingly arranged; the heating unit is arranged at the bottom or the side of the battery module; a thermal interface material is filled between the heating unit and the battery module; the heating unit temperature acquisition unit is arranged on the heating unit with the power density larger than a first preset threshold value and is used for acquiring the temperature of the heating unit; the heating system control unit is configured to: issuing an instruction to a power switch according to the temperature difference between the temperature of the heating unit and the temperature of the single battery; the power switch is used for: adjusting the heating power of the battery module through PWM; the ambient temperature acquisition unit is used for: collecting the ambient temperature; the heating system control unit is further configured to: and issuing an instruction to a power switch according to the temperature difference between the ambient temperature and the temperature of the single battery. Through above system, can obtain the temperature difference between heating unit and the battery cell, and according to the instruction is given for power switch to the temperature difference, lets power switch heat the battery module with different heating power, accomplishes individualized heating, will improve heating efficiency greatly, reduce unnecessary heating energy consumption, prolongs battery module's life simultaneously.
Furthermore, according to the difference value between the average temperature of the power battery and the ambient temperature, the heating system is closed, the heat preservation power is dynamically adjusted in a PWM mode, and the energy consumption of the heat preservation system is reduced as much as possible while the battery temperature is maintained in a reasonable range at low temperature. Through the active heat preservation system, the battery temperature can be always maintained in a reasonable range interval in a low-temperature environment, and the quick low-temperature charging efficiency, the quick low-temperature discharging efficiency and the quick service life are ensured. Meanwhile, the low-energy-consumption heat preservation system cannot generate large temperature difference due to small heating power.
Drawings
FIG. 1 is a schematic diagram of a module connection of a variable power low temperature heating system with temperature protection according to an embodiment;
FIG. 2 is a schematic structural diagram of a variable power low temperature heating system with a temperature protection function according to an embodiment;
FIG. 3 is a schematic diagram of a variable power low temperature heating system with temperature protection according to an embodiment;
fig. 4 is a schematic connection diagram of a heating system according to an embodiment.
Description of reference numerals:
10. a variable power low-temperature heating system with a temperature protection function,
11. a battery pack is provided with a battery pack,
110. a battery module is provided with a battery module,
1110. the number of the single batteries is increased,
12. a module temperature acquisition unit for acquiring the temperature of the module,
13. a heating unit for heating the substrate to be heated,
14. a temperature acquisition unit of the heating unit,
15. a control unit of the heating system is provided,
16. a power switch;
17. and an ambient temperature acquisition unit.
Detailed Description
To explain technical contents, structural features, and objects and effects of the technical solutions in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
Referring to fig. 1 to 4, in the present embodiment, a variable power low temperature heating system 10 with temperature protection function is implemented as follows:
first, in the present embodiment, three of the following are possible:
one is because of being provided with heating unit temperature acquisition unit 14 on heating unit 13, can carry out real-time temperature monitoring to heating unit 13, when heating unit 13 temperature reached preset temperature threshold value, reduces heating system power or disconnection heating system, avoids safety problems such as excessive temperature to appear in heating unit 13, guarantees the safety of heating process. The schematic connection diagram of the heating system is shown in fig. 4.
And secondly, a power switch 16 is used in a heating system loop, and the power of the system is accurately adjusted in a PWM control mode according to the temperature difference between the battery pack 11 and the heating unit 13, so that the safety, high efficiency and low energy consumption of the heating system are ensured, and meanwhile, low-temperature quick charging is realized. In addition, the heating control mode can realize that the temperature difference inside the battery pack 11 is within a reasonable range, thereby ensuring the service life of the battery;
and thirdly, closing the heating system according to the difference value between the average temperature of the power battery and the ambient temperature, dynamically adjusting the heat preservation power in a PWM mode, and reducing the energy consumption of the heat preservation system to the greatest extent while maintaining the battery temperature in a reasonable range at low temperature. Through the active heat preservation system, the battery temperature can be always maintained in a reasonable range interval in a low-temperature environment, and the quick low-temperature charging efficiency, the quick low-temperature discharging efficiency and the quick service life are ensured. Meanwhile, the low-energy-consumption heat preservation system cannot generate large temperature difference due to small heating power.
The following is a detailed description:
as shown in fig. 1, a variable power low temperature heating system 10 with temperature protection function includes: the system comprises a battery pack 11, a module temperature acquisition unit 12, a heating unit 13, a thermal interface material, a heating unit temperature acquisition unit 14, a power switch 16 and a heating system control unit 15;
the battery pack 11 is composed of more than two battery modules 110;
the battery module 110 is composed of more than two single batteries 1110;
module temperature acquisition unit 12 set up in on the battery module 110, module temperature acquisition unit 12 is used for: collecting the temperature of the single battery 1110 in the battery module 110 correspondingly arranged;
the heating unit 13 is disposed at the bottom or the side of the battery module 110;
a thermal interface material is filled between the heating unit 13 and the battery module 110;
the heating unit temperature acquisition unit 14 is arranged on the heating unit 13 with the power density larger than a first preset threshold, and the heating unit temperature acquisition unit 14 is used for acquiring the temperature of the heating unit 13;
the heating system control unit 15 is configured to: issuing an instruction to a power switch 16 according to the temperature difference between the temperature of the heating unit 13 and the temperature of the single battery 1110;
the power switch 16 is configured to: adjusting the heating power of the battery module 110 through PWM;
the ambient temperature acquisition unit 17 is configured to: collecting the ambient temperature;
the heating system control unit 17 is further configured to: and issuing an instruction to the power switch 16 according to the temperature difference between the ambient temperature and the temperature of the single battery 1110.
Specifically, see fig. 2 (it should be noted that the module temperature acquisition device in fig. 2 corresponds to the module temperature acquisition unit 12, the heating device corresponds to the heating unit 13, and the heating device temperature acquisition device corresponds to the heating device temperature acquisition unit):
the battery pack 11 is composed of a plurality of battery modules 110 in a series or parallel connection manner to form a high-voltage system;
the battery module 110 is composed of a plurality of single batteries 1110 connected in series or in parallel;
the unit cell 1110 includes, but is not limited to: the power battery comprises a soft package power battery, a square power battery and a cylindrical power battery;
the module temperature acquisition unit 12 is positioned on the module and used for acquiring the highest and lowest temperatures of the single batteries 1110 in the module;
the number of the module temperature acquisition units 12 is at least 2;
the number of the heating units 13 is a plurality of pieces, which is mainly determined according to the number of the battery modules 110;
the heating unit 13 is arranged at the bottom or the side of the battery module 110;
thermal interface materials are filled between the heating unit 13 and the battery module 110, so that the contact thermal resistance is reduced;
the thermal interface material is a heat conducting pad, a heat conducting grease or a material with filling heat conducting property;
the heating unit temperature acquisition unit 14 is a negative temperature coefficient thermistor;
the heating unit temperature acquisition unit 14 is generally arranged in the area where the power density of the heating unit 13 is maximum or the temperature of the battery pack 11 is higher;
the number of the heating unit temperature acquisition units 14 is at least 2;
the heating unit temperature acquisition unit 14 is used for protecting the safety of the heating system, and when the temperature of the heating unit temperature acquisition unit 14 reaches a certain temperature, the power of the heating system is reduced or the heating system is disconnected, so that the safety of the heating unit 13 and the battery is protected.
Further, the method also comprises the following steps: a battery pack 11 main positive relay and/or a battery pack 11 main negative relay;
the battery pack 11 main positive relay is used for: the normal on-off function of a main loop is ensured, and when the active heat preservation function is started, the battery pack 11 is subjected to heat preservation by matching with a main negative relay of the battery pack 11 and a power switch 16;
the battery pack 11 is provided with a main negative relay for: and the normal on-off function of the main loop is ensured, and when the active heat preservation function is started, the main positive relay of the battery pack 11 and the power switch 16 are matched to preserve heat of the battery pack 11.
Further, the single battery 1110 includes, but is not limited to: the power battery comprises a soft package power battery, a square power battery and a cylindrical power battery;
the module temperature acquisition unit 12 is a negative temperature coefficient thermistor;
the heating unit temperature acquisition unit 14 is a negative temperature coefficient thermistor;
the heating unit 13 is an electric heating unit, and the heating unit 13 includes but is not limited to: a silica gel heating plate, a mica plate heating plate and a polyimide heating film;
the thermal interface materials include, but are not limited to: a heat conductive pad, a heat conductive grease, a material having a filling heat conductive property;
the power switch 16 is a high power switch 16 type semiconductor device, and the power switch 16 includes but is not limited to: a thyristor power switch 16, an IGBT power switch 16, and a MOSFET power switch 16.
Further, the heating units 13 are connected in series to form a heating loop, the heating loop is connected in parallel with the battery pack 11, and the heating loop is connected in parallel with the vehicle-mounted charger. In a non-charging state, the battery pack 11 is heated by closing the main positive relay, the main negative relay and the heating system power switch 16 of the battery pack 11, and in a charging state, the battery pack 11 is heated by using an external power supply.
Furthermore, the fuse wire device further comprises a heating fuse wire which is a fuse link. The heating system mainly plays a role in overload protection, and when the current of the heating loop abnormally rises to a certain height and heat, the heating loop is fused by itself to cut off the current, so that the safe operation of the heating system is protected.
In the present embodiment, the power switch 16 may implement power adjustment of the heating system by means of PWM; the PWM is generally referred to as pulse width modulation, and is an analog control mode, and the bias of a transistor base electrode or an MOS tube grid electrode is modulated according to the change of corresponding load to change the conduction time of the transistor or the MOS tube, so that the change of the output of the switching voltage-stabilized power supply is realized.
The practical use process can be as follows:
detecting the temperature of the power battery in a charging initial stage and a charging process; the power battery temperature comprises a power battery highest temperature and a power battery lowest temperature;
detecting whether the current temperature of the power battery meets a preset heating condition;
when the current temperature of the power battery is detected to meet the heating condition, the heating control module drives the power switch 16 to accurately control the heating power in a PWM mode;
the PWM accurately controls the heating power and realizes the functions by controlling the duty ratio of the heating signal;
the heating power is related to a specific temperature difference;
the specific temperature difference refers to the difference between the temperature of the heating unit 13 and the temperature of the module;
the temperature of the heating unit 13 is acquired through a heating unit temperature acquisition unit 14;
the module temperature is acquired through the module temperature acquisition unit 12;
further, the module temperature is the lowest temperature of the power battery;
when the temperature difference between the power battery and the heating unit 13 is small, if high-power heating power is used, the problems of low efficiency, high energy consumption and the like exist, so that the battery pack 11 is heated by using small heating power;
further, in order to control the internal temperature difference of the power battery in the heating process, the temperature difference between the power battery and the heating unit 13 is generally controlled within a certain range, and the recommended value is 15 ℃;
further, when the difference between the temperature of the heating unit 13 and the temperature of the module is smaller than the initial temperature difference threshold, the heating power is at the minimum value;
further, the initial temperature difference threshold value is recommended to be 3 ℃, and the minimum value of the heating power is recommended to be 0W;
further, when the difference between the temperature of the heating unit 13 and the temperature of the module is less than 15 ℃, the heating power is increased in incremental power;
the incremental power recommended value is 100W/min;
further, when the temperature of the heating unit 13 reaches the protection temperature threshold, the heating power is decreased progressively according to the decreasing power until the temperature of the heating unit 13 is lower than the protection temperature threshold by 20 ℃;
the recommended value of the decreasing power is 200W/min;
further, when the temperature difference of the battery system reaches a preset protection threshold, the heating power is decreased progressively according to the decreasing power until the temperature difference of the battery system is lower than the preset protection threshold by 5 ℃;
the recommended value of the decreasing power is 200W/min;
the battery system temperature difference generally refers to the temperature difference between the temperature collection points of all modules in the battery pack 11;
the method is applied to the active heat preservation of the battery pack 11, and is implemented in the practical process as follows:
the active heat preservation function is applied to the parking process of the vehicle;
the heating control module acquires the average temperature and the ambient temperature of the power battery at regular time;
when the average temperature of the power battery reaches a preset heat preservation target temperature T0, comparing the average temperature with the current environmental temperature;
further, the recommended value of the active heat preservation target temperature T0 is 10 ℃;
when the difference between the average temperature of the power battery and the ambient temperature is greater than 10 ℃, the heating system control module issues an active heat preservation instruction;
the heating system control module closes a main positive relay and a main negative relay of the battery pack 11, and controls the heating system to keep the temperature of the battery pack 11 in a PWM (pulse width modulation) mode;
the heat preservation time does not exceed the single continuous heat preservation time t0, and the recommended value is 8 h;
the heating power drives the power switch 16 to accurately adjust the heating power in a PWM mode;
further, the initial heating power is preset to be a small value, and the recommended value is 80W;
further, when the difference between the average temperature of the power battery and the ambient temperature is 40 ℃, the corresponding heating power is 300W;
further, during heat preservation, the maximum heating power does not exceed 300W, the heating power of other temperature differences is within the range of 80W-300W, and linear interpolation is utilized to obtain the temperature difference;
further, in order to avoid unnecessary energy loss, when the heat preservation is started, the maximum duration time does not exceed the preset single maximum heating time t0, and the recommended value is 8 h;
preferably, the active keep-warm function can be turned on or turned off in advance by the remote client.
A variable power cryogenic heating system 10 with temperature protection, comprising: the system comprises a battery pack 11, a module temperature acquisition unit 12, a heating unit 13, a thermal interface material, a heating unit temperature acquisition unit 14, a power switch 16 and a heating system control unit 15; the battery pack 11 is composed of more than two battery modules 110; the battery module 110 is composed of more than two single batteries 1110; module temperature acquisition unit 12 set up in on the battery module 110, module temperature acquisition unit 12 is used for: collecting the temperature of the single battery 1110 in the battery module 110 correspondingly arranged; the heating unit 13 is disposed at the bottom or the side of the battery module 110; a thermal interface material is filled between the heating unit 13 and the battery module 110; the heating unit temperature acquisition unit 14 is arranged on the heating unit 13 with the power density larger than a first preset threshold, and the heating unit temperature acquisition unit 14 is used for acquiring the temperature of the heating unit 13; the heating system control unit 15 is configured to: issuing an instruction to a power switch 16 according to the temperature difference between the temperature of the heating unit 13 and the temperature of the single battery 1110; the power switch 16 is configured to: the heating power to the battery module 110 is adjusted by PWM. Through the system, the temperature difference between the heating unit 13 and the single battery 1110 can be obtained, and an instruction is sent to the power switch 16 according to the temperature difference, so that the power switch 16 heats the battery module 110 with different heating powers, personalized heating is achieved, the heating efficiency is greatly improved, unnecessary heating energy consumption is reduced, and the service life of the battery module 110 is prolonged.
Furthermore, according to the difference value between the average temperature of the power battery and the ambient temperature, the heating system is closed, the heat preservation power is dynamically adjusted in a PWM mode, and the energy consumption of the heat preservation system is reduced as much as possible while the battery temperature is maintained in a reasonable range at low temperature. Through the active heat preservation system, the battery temperature can be always maintained in a reasonable range interval in a low-temperature environment, and the quick low-temperature charging efficiency, the quick low-temperature discharging efficiency and the quick service life are ensured. Meanwhile, the low-energy-consumption heat preservation system cannot generate large temperature difference due to small heating power.
It should be noted that, although the above embodiments have been described herein, the scope of the present invention is not limited thereby. Therefore, based on the innovative concept of the present invention, the changes and modifications of the embodiments described herein, or the equivalent structure or equivalent process changes made by the contents of the specification and the drawings of the present invention, directly or indirectly apply the above technical solutions to other related technical fields, all included in the protection scope of the present invention.
Claims (5)
1. A variable power low temperature heating system with temperature protection function is characterized by comprising: the system comprises a battery pack, a module temperature acquisition unit, a heating unit temperature acquisition unit, a power switch, a heating system control unit and an environment temperature acquisition unit;
the battery pack is composed of more than two battery modules;
the battery module consists of more than two single batteries;
the module temperature acquisition unit set up in on the battery module, the module temperature acquisition unit is used for: collecting the temperature of the single batteries in the battery module correspondingly arranged;
the heating unit is arranged at the bottom or the side of the battery module;
a thermal interface material is filled between the heating unit and the battery module;
the heating unit temperature acquisition unit is arranged on the heating unit with the power density larger than a first preset threshold value and is used for acquiring the temperature of the heating unit;
the heating system control unit is configured to: issuing an instruction to a power switch according to the temperature difference between the temperature of the heating unit and the temperature of the single battery;
the power switch is used for: adjusting the heating power of the battery module through PWM;
the ambient temperature acquisition unit is used for: collecting the ambient temperature;
the heating system control unit is further configured to: and issuing an instruction to a power switch according to the temperature difference between the ambient temperature and the temperature of the single battery.
2. The variable power cryogenic heating system with temperature protection of claim 1, further comprising: a battery pack main positive relay and/or a battery pack main negative relay;
the battery pack main positive relay is used for: when the active heat preservation function is started, the battery pack is subjected to heat preservation by matching with the main and negative relays of the battery pack and the power switch;
the battery pack main and negative relays are used for: when the active heat preservation function is started, the battery pack is subjected to heat preservation by matching with the main positive relay and the power switch of the battery pack.
3. The variable power low temperature heating system with temperature protection function of claim 1,
the unit cell includes, but is not limited to: the power battery comprises a soft package power battery, a square power battery and a cylindrical power battery;
the module temperature acquisition unit is a negative temperature coefficient thermistor;
the heating unit temperature acquisition unit is a negative temperature coefficient thermistor;
the heating unit is an electrical heating unit, and the heating unit includes but is not limited to: a silica gel heating plate, a mica plate heating plate and a polyimide heating film;
the thermal interface materials include, but are not limited to: a heat conductive pad, a heat conductive grease, a material having a filling heat conductive property;
the power switch is a high-power switch type semiconductor device, and the power switch comprises but is not limited to: silicon controlled power switch, IGBT power switch, MOSFET power switch.
4. The variable power low temperature heating system with temperature protection function of claim 1,
the heating units are connected in series to form a heating loop, the heating loop is connected with the battery pack in parallel, and the heating loop is connected with the vehicle-mounted charger in parallel.
5. The variable-power low-temperature heating system with the temperature protection function of claim 1, further comprising a heating fuse, wherein the heating fuse is a fuse link.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120675560.2U CN214797543U (en) | 2021-04-02 | 2021-04-02 | Variable-power low-temperature heating system with temperature protection function |
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| CN202120675560.2U CN214797543U (en) | 2021-04-02 | 2021-04-02 | Variable-power low-temperature heating system with temperature protection function |
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