Lithium battery constant temperature protection device and lithium battery

Abstract

The lithium battery constant-temperature protection device comprises a shell assembly, a heat exchange assembly and a circulation assembly, the shell assembly comprises a cover plate, a middle shell and a bottom plate, the cover plate, the middle shell and the bottom plate are buckled to form a sealed shell, and heat-conducting medium shunting cavities are formed in the cover plate, the middle shell and the bottom plate; the shunting cavity of the middle shell is respectively connected with the shunting cavities of the cover plate and the bottom plate, and a plurality of groups of opposite battery cell positioning grooves are uniformly distributed in the cover plate and the bottom plate; the heat exchange assembly comprises a plurality of heat exchange tubes arranged in parallel, and the heat exchange tubes are uniformly filled around the battery cell positioning groove, are connected with the cover plate and the bottom plate at the same time, and are communicated with the shunting cavities in the cover plate and the bottom plate; the circulating assembly is connected with the cover plate and the bottom plate and conveys heat-conducting media for the shell assembly and the heat exchange assembly. The heat exchange area is large, the heat exchange efficiency is high, the temperature control effect of the space where the battery cell is located is improved, and use is safer and more reliable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium batteries, in particular to a lithium battery constant temperature protection device and a lithium battery. BACKGROUND

[0002] Lithium batteries are widely used in various aspects of production and life, and have the advantages of high energy density, long service life, light weight, fast charging speed and higher power bearing force compared with traditional batteries. At the same time, like traditional batteries, lithium batteries are also susceptible to the surrounding environment, especially temperature. The suitable working temperature range of lithium batteries is usually 0-40℃, when the temperature is too high, the chemical reaction inside the battery accelerates, reducing the cycle life of the battery; when the temperature is too low, the viscosity of the electrolyte inside the battery increases, affecting the internal resistance and charging and discharging performance of the battery. The conventional battery usually exchanges heat with the outside world through its own structure, which is low in efficiency and slow in heat exchange speed, therefore, it is necessary to design a battery heat preservation structure, for example, Chinese patent CN201220011899.3 discloses a lithium battery heat preservation device, which sets a temperature control circuit in the insulating box of the battery to control the temperature, however, the temperature control means is a thermoelectric refrigeration piece, which has safety hazards and general control effect. CONTENT OF THE UTILITY MODEL

[0003] The present application provides a lithium battery constant temperature protection device and a lithium battery to solve the problem that the temperature of the lithium battery is too high or too low in the prior art, affecting the performance of the battery, and the general heat preservation effect of the existing battery heat preservation device structure.

[0004] According to the lithium battery constant temperature protection device provided by the present application, comprising:

[0005] The shell assembly comprises a cover plate, a middle shell and a bottom plate, the cover plate, the middle shell and the bottom plate are buckled to form a sealed shell body, the inside of the cover plate, the middle shell and the bottom plate is provided with a heat conducting medium shunt cavity, the shunt cavity of the middle shell is connected with the shunt cavities of the cover plate and the bottom plate respectively, and a plurality of groups of opposed cell positioning grooves are uniformly distributed on the cover plate and the bottom plate;

[0006] The heat exchange assembly comprises a plurality of parallel heat exchange pipes, the heat exchange pipes are uniformly filled around the cell positioning grooves and are connected with the cover plate and the bottom plate at the same time, and the shunt cavities in the cover plate and the bottom plate are communicated;

[0007] The circulation assembly is connected with the cover plate and the bottom plate, and conveys the heat conducting medium for the shell assembly and the heat exchange assembly.

[0008] In some embodiments, the cell positioning grooves on the cover plate and the bottom plate are circular or rectangular in shape, are uniformly arranged in a matrix along the vertical direction, and the heat exchange pipes are cylindrical and are arranged at the gap formed by every four groups of cell positioning grooves.

[0009] In some embodiments, the structural strength of the heat exchange pipe is lower than the shell strength of the battery cell, and the heat conducting medium flowing in the heat exchange pipe is insulating heat conducting oil.

[0010] In some embodiments, a sealing adhesive layer is arranged between the cover plate and the middle shell, and between the middle shell and the bottom plate.

[0011] In some embodiments, four sealing threaded holes are arranged on the cover plate, and a thermocouple sensor, positive and negative electrodes of the battery cell group, and an electric control terminal are respectively arranged in the four sealing threaded holes.

[0012] In some embodiments, a first heat exchange interface is arranged on the outer side of the cover plate, and a second heat exchange interface is arranged on the outer side of the bottom plate, and two ends of the circulation assembly are respectively connected with the first heat exchange interface and the second heat exchange interface.

[0013] In some embodiments, the first heat exchange interface and the second heat exchange interface are arranged in an aligned relationship and are centrally arranged, and the shunt cavities in the cover plate and the bottom plate are arranged in a radial manner.

[0014] In some embodiments, the circulation assembly comprises a circulation pipeline, a flow control valve, a circulation pump, and a heat exchanger, and the heat exchanger is provided with a heating coil and a cooling fan.

[0015] In some embodiments, the circulation pipeline comprises an inlet connecting pipeline and an outlet connecting pipeline, the inlet connecting pipeline is connected with the cover plate, the outlet connecting pipeline is connected with the bottom plate, and the flow control valve and the circulation pump are sequentially arranged on the outlet connecting pipeline.

[0016] According to another aspect of the present application, a lithium battery is provided, which comprises a battery cell group and the lithium battery constant temperature protection device as above.

[0017] The technical solution of this application includes a lithium battery constant temperature protection device comprising: a shell assembly, a heat exchange assembly, and a circulation assembly. The shell assembly includes a cover plate, a middle shell, and a bottom plate, which are fastened together to form a sealed shell. Each of the cover plate, middle shell, and bottom plate has a heat-conducting medium distribution cavity. The distribution cavity of the middle shell is connected to the distribution cavities of the cover plate and the bottom plate, respectively. Multiple sets of opposing cell positioning slots are evenly distributed on the cover plate and the bottom plate. The heat exchange assembly includes multiple parallel heat exchange tubes, which are evenly filled around the cell positioning slots and simultaneously connected to the cover plate and the bottom plate, connecting the distribution cavities within the cover plate and the bottom plate. The circulation assembly connects the cover plate and the bottom plate, supplying heat-conducting medium to the shell assembly and the heat exchange assembly. This application incorporates flow-diverting cavities within the cover plate, middle shell, and bottom plate of the sealed housing. This enables temperature control of the housing itself and provides overall temperature control for the space containing the lithium battery cell. Furthermore, this application uniformly fills the perimeter of the cell positioning groove with heat exchange tubes, connecting the flow-diverting cavities between the cover plate and bottom plate. These tubes are distributed parallel to the cell, further enhancing temperature control in the near-field space of the cell. The large heat exchange area and high heat exchange efficiency improve the temperature control effect on the space containing the cell. Moreover, the heat transfer medium flows within the outer shell assembly and heat exchange assembly without contacting the cell, thus avoiding electrical interference and making the application safer and more reliable. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This paper shows an exploded structural diagram of the outer casing assembly and heat exchange assembly of the lithium battery constant temperature protection device according to an embodiment of this application;

[0021] Figure 2 It shows Figure 1 A schematic diagram of the exploded structure of the base plate and heat exchange components of the lithium battery constant temperature protection device;

[0022] Figure 3 This paper shows an overall isometric structural schematic diagram of the lithium battery constant temperature protection device according to an embodiment of this application;

[0023] The above figures include the following reference numerals:

[0024] 1, housing assembly; 11, cover plate; 111, sealing threaded hole; 112, first heat exchange interface; 12, middle shell; 13, bottom plate; 131, battery cell positioning groove; 132, second heat exchange interface; 2, heat exchange assembly; 21, heat exchange pipe; 3, circulation assembly; 31, inlet connecting pipeline; 32, outlet connecting pipeline; 33, flow control valve; 34, circulation pump; 35, heat exchanger; 36, cooling fan; 4, battery cell group. DETAILED DESCRIPTION

[0025] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs.

[0027] For ease of description, spatial relative terms such as "over", "above", "upper surface", "upper", etc. can be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device as described in the drawings. For example, if the device in the drawings is inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned 90 degrees or in other orientations in other different ways, and the spatial relative descriptions used herein are interpreted accordingly.

[0028] It should be noted that the terms used herein are only for the purpose of describing the specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a presence of the features, steps, operations, devices, components and / or combinations thereof.

[0029] It is to be understood that the terms "first", "second", and the like, used in the description and the claims of the present application as well as the above description of the drawings merely refer to categories and do not necessarily imply a specific order or chronology of events. It is to be understood that the use of the term "about" along with a value indicates that a value close to the stated value is intended, such as values falling within the range of 10% above and below the stated value. Also, the use of the term "about" along with a value indicates that a value close to the stated value is intended, such as values falling within the range of 10% above and below the stated value. It is to be understood that the terms "comprises" and "comprising", or "includes" and "including" when used in this specification, specify the presence of stated features, integers, steps, or components, but do not preclude the presence or addition of one or more other features, integers, steps, components, or groups thereof. It is to be understood that the terms "including", "comprising", "consisting" and "involving", as well as any variations thereof, are used equivalently herein and refer to the inclusion of the stated features, integers, steps, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, components, or groups thereof.

[0030] Figures 1 to 3 An embodiment of the lithium battery constant temperature protection device is schematically shown.

[0031] As shown in Figures 1 to 3 The lithium battery constant temperature protection device disclosed by the present application comprises: a shell assembly 1, the shell assembly 1 comprising a cover plate 11, a middle shell 12 and a bottom plate 13, the cover plate 11, the middle shell 12 and the bottom plate 13 being fastened to form a sealed shell, the inside of the cover plate 11, the middle shell 12 and the bottom plate 13 each being provided with a heat-conducting medium shunt cavity, the shunt cavities of the middle shell 12 being connected with the shunt cavities of the cover plate 11 and the bottom plate 13 respectively, and a plurality of groups of opposed cell positioning grooves 131 being uniformly distributed on the cover plate 11 and the bottom plate 13; a heat exchange assembly 2, the heat exchange assembly 2 comprising a plurality of parallel heat exchange pipes 21, the heat exchange pipes 21 being uniformly filled around the cell positioning grooves 131 and simultaneously connected with the cover plate 11 and the bottom plate 13 to communicate the shunt cavities in the cover plate 11 and the bottom plate 13; and a circulation assembly 3, the circulation assembly 3 being connected with the cover plate 11 and the bottom plate 13 to deliver heat-conducting medium to the shell assembly 1 and the heat exchange assembly 2.

[0032] Through the above structural design, the lithium battery constant temperature protection device of the present application embodiment is provided with shunt cavities in the cover plate 11, the middle shell 12 and the bottom plate 13 of the sealed shell, so that the temperature control of the shell itself can be realized to perform overall temperature control on the space where the lithium battery cell is located. Meanwhile, the heat exchange pipes 21 are uniformly filled around the cell positioning grooves 131 in the present application embodiment, so that the heat exchange pipes 21 communicate the shunt cavities between the cover plate 11 and the bottom plate 13, the heat exchange area is large, the heat exchange efficiency is high, the temperature control of the near-field space of the cell is further realized, the temperature control effect on the space where the cell is located is improved, and moreover, the heat-conducting medium flows in the shell assembly 1 and the heat exchange assembly 2 without contacting the cell, so that no electric interference is generated, and the use is safer and more reliable.

[0033] In some embodiments of the present application, the cell positioning grooves on the cover plate 11 and the bottom plate 13 are circular or rectangular in shape, arranged in a matrix in the vertical direction, and can be adapted to rectangular or circular cross-sectioned cells, which are placed uniformly and neatly, leaving installation gaps for the installation of the heat exchange pipes 21. As shown in the embodiments of the present application Figure 1 and Figure 2 The cell positioning grooves 131 are circular in shape and can be matched with 26650 type cylindrical cells. The heat exchange pipes 21 are cylindrical and are arranged at the gaps formed by every four groups of cell positioning grooves 131, so as to be arranged in parallel with the cells and close to the cells for heat exchange and temperature control, so as to protect the near-field space temperature of the cells to be stable and suitable, and protect the normal working environment of the cells.

[0034] In some embodiments of the present application, the heat-conducting medium flowing in the heat exchange pipes 21 is insulating heat-conducting oil. For example, transformer oil for high-voltage transformers is selected, which mainly contains alkane, naphthenic saturated hydrocarbon and aromatic unsaturated hydrocarbon compounds, commonly known as square shed oil, which can be purchased from the market, and has the advantages of low freezing point, good insulation and high flash point, and is safe and reliable in nature. The insulating heat-conducting oil flows in the shell assembly 1 and the heat exchange assembly 2 and does not come into contact with the cells, so as not to cause electrical interference, and even if it leaks, the cell group 4 will not be short-circuited. Moreover, in the embodiments of the present application, the structural strength of the heat exchange pipes 21 is lower than the shell strength of the cells, so that once the cells are impacted and damaged, the heat exchange pipes 21 will also be broken, so that the insulating heat-conducting oil flows out to cover the damaged surface of the cells, slows down the fire speed of the damaged cells, reduces the damage to other cells, and provides more time for personnel to escape and rescue.

[0035] In some embodiments of the present application, the present application is provided with a sealing adhesive layer between the cover plate 11 and the middle shell 12 and between the middle shell 12 and the bottom plate 13, so as to realize the sealing and packaging of the shell through the sealing adhesive layer, so as to improve the heat insulation capacity and safety. The sealing adhesive layer can not only isolate air and reduce heat conduction, but also can avoid the oxidation problem caused by air entering, so as to improve the service life of the battery.

[0036] In some embodiments of the present application, as shown in Figure 1 The cover plate 11 is provided with four sealing threaded holes 111, and a thermocouple sensor, a positive electrode and a negative electrode of the cell group 4 and an electric control wiring end are respectively installed in the four sealing threaded holes 111, so as to realize the temperature detection and control of the inside of the shell and the electrical connection and control of the cell group 4. Among them, the thermocouple sensor is installed in the inside of the shell, can monitor the internal temperature in real time, and transmits the temperature data to the electrical control system. The electrical control system analyzes the temperature data and controls the heating or heat dissipation.

[0037] In some embodiments of the present application, as shown in Figure 1As shown, the outer side of the cover plate 11 is provided with a first heat exchange interface 112, the outer side of the bottom plate 13 is provided with a second heat exchange interface 132, and the two ends of the circulating assembly 3 are connected with the first heat exchange interface 112 and the second heat exchange interface 132 respectively. The circulating assembly 3 is used to realize the circulation of the heat conducting medium, so that it flows into the cover plate 11 and flows out of the bottom plate 13, thereby realizing the temperature control of the battery cell group 4 and heating or cooling heat dissipation.

[0038] In some embodiments of the present application, the first heat exchange interface 112 and the second heat exchange interface 132 are arranged in an aligned relationship on the cover plate 11 and the bottom plate 13 and are centrally arranged, and at the same time, the shunt cavities in the cover plate 11 and the bottom plate 13 are arranged in a radial distribution, so that the heat conducting medium can uniformly and fully flow through each part of the shell assembly 1 and the heat exchange assembly 2, thereby realizing efficient and uniform control of the battery temperature and avoiding local temperature dead angles, and improving the temperature control effect.

[0039] In some embodiments of the present application, as shown in the accompanying drawings, Figure 3 The circulating assembly 3 includes a circulating pipeline, a flow control valve 33, a circulating pump 34 and a heat exchanger 35, wherein the heat exchanger 35 is provided with a heating coil and a cooling fan 36, which can realize heating and cooling of the heat conducting medium, thereby realizing comprehensive temperature control of the battery cell group 4 and having a wider application range. The circulating assembly 3 can be used in combination with the thermocouple sensor installed in the shell assembly 1. The thermocouple sensor is installed inside the shell assembly 1 to monitor the internal temperature in real time and transmit the temperature data to the electrical control system. The electrical control system analyzes the data and controls the flow control valve 33 to adjust the flow rate of the insulating heat conducting oil. When the temperature is high, the heat exchanger 35 is controlled to cool, and when the temperature is low, the heat exchanger 35 is controlled to heat.

[0040] In some embodiments of the present application, as shown in the accompanying drawings, Figure 3 The circulating pipeline includes an inlet connecting pipeline 31 and an outlet connecting pipeline 32, the inlet connecting pipeline 31 is connected with the cover plate 11, the outlet connecting pipeline 32 is connected with the bottom plate 13, and the flow control valve 33 and the circulating pump 34 are sequentially arranged on the outlet connecting pipeline 32. By sequentially installing the flow control valve 33 and the circulating pump 34 on the outlet connecting pipeline 32, the flow control of the heat conducting medium and the valve closing in case of unexpected situations can be realized. At the same time, it is also convenient to use the circulating pump 34 to pump the insulating heat conducting oil as the heat conducting medium into the shell assembly 1 in case of unexpected situations to cover the damaged battery cell group 4, slow down the fire speed and provide more time for personnel evacuation and rescue.

[0041] The present application also discloses a lithium battery, which comprises a battery cell group 4 and a lithium battery constant temperature protection device according to the above embodiments, and has the advantages of temperature stability and safe and reliable use.

[0042] In summary, the lithium battery constant temperature protection device of the embodiment of the application comprises: a shell assembly, a heat exchange assembly and a circulation assembly. The shell assembly comprises a cover plate, a middle shell and a bottom plate, which are fastened to form a sealed shell. The cover plate, the middle shell and the bottom plate are each provided with a heat conduction medium shunt cavity. The shunt cavity of the middle shell is connected with the shunt cavities of the cover plate and the bottom plate. The cover plate and the bottom plate are each provided with a plurality of sets of opposed cell positioning grooves. The heat exchange assembly comprises a plurality of parallel heat exchange pipes, which are uniformly filled around the cell positioning grooves and connected with the cover plate and the bottom plate, and communicate the shunt cavities in the cover plate and the bottom plate. The circulation assembly is connected with the cover plate and the bottom plate, and supplies the shell assembly and the heat exchange assembly with heat conduction medium. The shunt cavities are arranged in the cover plate, the middle shell and the bottom plate of the sealed shell, so that the temperature of the shell itself can be controlled, and the space where the lithium battery cell is located can be controlled in whole. In addition, the heat exchange pipes are uniformly filled around the cell positioning grooves, the heat exchange pipes communicate the shunt cavities between the cover plate and the bottom plate, and the heat exchange pipes are parallel to the cell, so that the temperature of the near-field space of the cell can be further controlled. The heat exchange area is large, the heat exchange efficiency is high, the temperature control effect on the space where the cell is located is improved, and the heat conduction medium flows in the shell assembly and the heat exchange assembly without contacting the cell and causing electrical interference, so that the use is safer and more reliable.

[0043] In the preferred embodiment of the application, the heat conduction medium is insulating heat conduction oil, the shell assembly is further provided with a thermocouple sensor, the circulation assembly comprises a circulation pipeline, a flow control valve, a circulation pump and a heat exchanger, and the heat exchanger is provided with a heating coil and a cooling fan. The circulation pump provides power for the insulating heat conduction oil in the pipeline, the thermocouple sensor is installed in the shell assembly, monitors the internal temperature in real time, and transmits the temperature data to an electrical control system. The electrical control system analyzes the data and controls the flow control valve to adjust the flow rate of the insulating heat conduction oil. When the temperature is high, the heat exchanger is controlled to cool, and when the temperature is low, the heat exchanger is controlled to heat. The temperature control is comprehensive and efficient. In addition, in the case of impact damage of the cell, the insulating heat conduction oil can quickly cover the damaged surface, slow down the fire speed of the damaged cell, reduce the damage degree of other cells, provide more time for personnel escape and rescue, and significantly improve the safety.

[0044] The above is only the preferred embodiment of the application and is not used to limit the application. Various modifications and changes can be made to the application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. A thermostat protection device for lithium batteries, characterized in that, The application relates to a battery pack, which comprises the following components: a shell assembly (1) comprising a cover plate (11), a middle shell (12) and a bottom plate (13), the cover plate (11), the middle shell (12) and the bottom plate (13) being fastened to form a sealed shell, the cover plate (11), the middle shell (12) and the bottom plate (13) being internally provided with heat-conducting medium shunt cavities, the shunt cavities of the middle shell (12) being connected with the shunt cavities of the cover plate (11) and the bottom plate (13) respectively, and a plurality of groups of opposed cell positioning grooves (131) being uniformly distributed on the cover plate (11) and the bottom plate (13); a heat exchange assembly (2) comprising a plurality of parallel heat exchange pipes (21), the heat exchange pipes (21) being uniformly filled around the cell positioning grooves (131) and simultaneously connected with the cover plate (11) and the bottom plate (13) to communicate the shunt cavities in the cover plate (11) and the bottom plate (13); and a circulating assembly (3) connected with the cover plate (11) and the bottom plate (13) and used for conveying heat-conducting medium for the shell assembly (1) and the heat exchange assembly (2). The cell positioning grooves (131) on the cover plate (11) and the bottom plate (13) are circular or rectangular in shape and are uniformly arranged in a matrix along the vertical direction, and the heat exchange pipes (21) are cylindrical and arranged at the interspaces formed by every four groups of the cell positioning grooves (131). The structural strength of the heat exchange pipes (21) is lower than the shell strength of the cells, and the heat-conducting medium flowing in the heat exchange pipes (21) is insulating heat-conducting oil. Sealing adhesive layers are arranged between the cover plate (11) and the middle shell (12) and between the middle shell (12) and the bottom plate (13).

2. The lithium battery thermostat protection device according to claim 1, wherein, Four sealing threaded holes (111) are arranged on the cover plate (11), and a thermocouple sensor, positive and negative electrodes of a cell group (4) and an electric control wiring end are respectively arranged in the four sealing threaded holes (111).

3. The lithium battery thermostat protection device according to claim 1, wherein, A first heat exchange interface (112) is arranged on the outer side of the cover plate (11), a second heat exchange interface (132) is arranged on the outer side of the bottom plate (13), and the two ends of the circulating assembly (3) are connected with the first heat exchange interface (112) and the second heat exchange interface (132) respectively.

4. The lithium battery thermostat protection device of claim 1, wherein, The first heat exchange interface (112) and the second heat exchange interface (132) are arranged in an aligned relationship and are centrally arranged, and the shunt cavities in the cover plate (11) and the bottom plate (13) are arranged in a radial distribution.

5. The lithium battery thermostat protector of claim 1, wherein, The circulating assembly (3) comprises a circulating pipeline, a flow control valve (33), a circulating pump (34) and a heat exchanger (35), and the heat exchanger (35) is internally provided with a heating coil and a cooling fan (36).

6. The lithium battery thermostat protection device of claim 1, wherein, The circulating pipeline comprises an inlet connecting pipeline (31) and an outlet connecting pipeline (32), the inlet connecting pipeline (31) is connected with the cover plate (11), the outlet connecting pipeline (32) is connected with the bottom plate (13), and the flow control valve (33) and the circulating pump (34) are sequentially arranged on the outlet connecting pipeline (32).

7. The lithium battery thermostat protection device according to claim 6, wherein, ​ 8. The lithium battery thermostat protection device of claim 1, wherein, ​ 9. The lithium battery thermostat protection device of claim 8, wherein, ​ 10. A lithium battery, characterized by, The lithium battery comprises a cell group (4) and the lithium battery constant temperature protection device as claimed in any one of claims 1 to 9.

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