Battery fire extinguishing device

Abstract

The utility model discloses a battery fire extinguishing device, including a plate body and a fire extinguishing structure, wherein the plate body is used to contact with the battery, the fire extinguishing structure is arranged in the plate body, at least two states of fire extinguishing media can be introduced into the fire extinguishing structure, when the battery is working normally, the plate body acts as a cooling plate to cool the battery; when the battery is working abnormally, at least one state of the fire extinguishing medium in the fire extinguishing structure overflows from the plate body to extinguish the battery. The utility model adopts fire extinguishing media in different states to extinguish fire, which is highly safe and can effectively reduce losses; multiple fire extinguishing media are integrated, with simple structure and high space utilization.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery fire extinguishing device. Background Art

[0002] Lithium batteries are prone to spontaneous combustion when out of control, so fire extinguishing devices are essential. Current fire extinguishing devices mostly use a single gas medium or liquid medium to extinguish fires, which has low fire extinguishing efficiency. Utility Model Content

[0003] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the utility model is to provide a battery fire extinguishing device, which has high safety and can effectively reduce losses; multiple fire extinguishing media are integrated, with a simple structure and high space utilization.

[0004] The purpose of the utility model is achieved through the following technical solutions:

[0005] A battery fire extinguishing device comprises a plate body and a fire extinguishing structure, wherein the plate body is used to contact a battery, the fire extinguishing structure is arranged in the plate body, at least two states of fire extinguishing medium can be passed into the fire extinguishing structure, when the battery works normally, the plate body serves as a cooling plate to cool the battery; when the battery works abnormally, at least one state of the fire extinguishing medium in the fire extinguishing structure overflows from the plate body to extinguish the battery.

[0006] In one embodiment, the plate body includes a substrate and a diffusion plate. The substrate and the diffusion plate are detachably connected along the thickness direction of the plate body. The fire extinguishing structure is arranged on the substrate. The side of the diffusion plate away from the substrate is used to install the battery. The fire extinguishing medium is diffused outside the plate body through the diffusion plate.

[0007] In one embodiment, the diffusion plate is a tray-type structure, and a groove is provided on a side of the diffusion plate away from the plate body for installing a battery.

[0008] In one embodiment, a card slot is provided on the substrate, a card edge is provided on the diffusion plate at a position corresponding to the card slot, and the diffusion plate is inserted into the card slot through the card edge.

[0009] In one embodiment, the fire extinguishing structure includes a flow channel disposed on the substrate, and the fire extinguishing medium flows in the flow channel.

[0010] In one embodiment, the flow channel includes a gas flow channel and a liquid flow channel, and the gas flow channel and the liquid flow channel are both arranged on a side of the substrate close to the diffusion plate. The fire extinguishing medium includes a coolant and a gas fire extinguishing agent. The gas flow channel is used to circulate the gas fire extinguishing agent, and the liquid flow channel is used to circulate the coolant.

[0011] In one embodiment, an air inlet is provided on the substrate for introducing the gas fire extinguishing agent, and the air inlet is communicated with the gas flow channel.

[0012] In one embodiment, a plurality of overflow ports and / or overflow holes are provided on the diffusion plate at positions corresponding to the gas flow channels.

[0013] In one embodiment, a liquid inlet and a liquid outlet are provided on the substrate for introducing or discharging coolant, the liquid inlet is connected to one end of the liquid flow channel, and the liquid outlet is connected to the other end of the liquid flow channel.

[0014] In one embodiment, the gas flow channel and the liquid flow channel are independently arranged, and the gas flow channel and the liquid flow channel intersect to form a connecting point; the fire extinguishing structure also includes a temperature measuring structure, and the temperature measuring structure is arranged at the connecting point of the gas flow channel and the liquid flow channel. When the temperature of the battery is greater than the set temperature, the temperature measuring structure is opened, and the coolant flows from the liquid flow channel into the gas flow channel, and then overflows through the diffusion plate.

[0015] In one embodiment, the temperature measuring structure is a temperature-sensitive glass liquid column, and when the temperature of the battery is greater than a set temperature, the temperature-sensitive glass liquid column breaks.

[0016] In one embodiment, the fire extinguishing structure further includes a temperature detection line, and a mounting groove is provided on the substrate at a position adjacent to the flow channel, and the temperature detection line is installed in the mounting groove.

[0017] In one embodiment, a threading hole is opened on the substrate corresponding to the mounting groove, and one end of the temperature detection wire passes through the threading hole and is placed outside the substrate.

[0018] The beneficial effects of the utility model are as follows: by arranging a fire extinguishing structure in the plate body, and at least two states of fire extinguishing media can be introduced into the fire extinguishing structure, when the battery works normally and the temperature is normal, the plate body acts as a cooling plate to cool the battery; when the battery works abnormally and the temperature rises, at least one state of fire extinguishing media in the fire extinguishing structure overflows to extinguish the battery, which has high safety and can effectively reduce losses; and a variety of fire extinguishing media are integrated, with a simple structure and high space utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a structural schematic diagram of a battery fire extinguishing device according to an embodiment of the utility model;

[0021] Figure 2 It is a structural schematic diagram of a battery fire extinguishing device according to another embodiment of the utility model;

[0022] Figure 3 yes Figure 1 A schematic diagram of a structure in which a substrate is not installed with a temperature detection line;

[0023] Figure 4 yes Figure 1 A schematic plan view of a substrate in FIG.

[0024] Figure 5 yes Figure 2 A schematic diagram of the structure of the diffuser plate;

[0025] Figure 6 yes Figure 1 Schematic diagram of the local section along AA.

[0026] In the figure: 1. plate body; 11. base plate; 111. liquid inlet; 112. liquid outlet; 113. air inlet; 114. mounting groove; 115. card slot; 116. threading hole; 12. diffusion plate; 121. overflow port; 122. overflow hole; 123. groove; 124. card edge; 125. through hole; 2. fire extinguishing structure; 21. flow channel; 211. gas flow channel; 212. liquid flow channel; 22. temperature-sensitive glass liquid column; 23. temperature detection line; 24. bracket. DETAILED DESCRIPTION

[0027] The following will describe in detail a specific embodiment of the utility model in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the description of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] In the description of the present utility model, unless otherwise clearly specified and limited, the terms "set", "install", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0029] The directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the utility model.

[0030] The terms "first", "second", "third" and the like are merely used to distinguish elements of similar nature, and do not indicate or imply relative importance or a particular order.

[0031] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of the elements listed and may also include additional elements not expressly listed.

[0032] The utility model provides a battery fire extinguishing device, such as Figures 1 to 6 As shown, it includes a plate body 1 and a fire extinguishing structure 2. The plate body 1 is used to contact and connect with a battery (not shown). The fire extinguishing structure 2 is arranged in the plate body 1. At least two states of fire extinguishing media can be introduced into the fire extinguishing structure 2. When the battery works normally, the battery temperature is normal, and the plate body 1 serves as a cooling plate to cool the battery; when the battery works abnormally, the battery temperature rises, and at least one state of fire extinguishing media in the fire extinguishing structure 2 overflows from the plate body 1 to extinguish the battery.

[0033] In this embodiment, the fire extinguishing structure 2 is provided on the plate body 1, and at least two states of fire extinguishing media can be introduced into the fire extinguishing structure 2. The utility model integrates multiple fire extinguishing media on the plate body, has high safety, can effectively reduce losses, and has a simple structure and high space utilization.

[0034] Among them, the fire extinguishing medium selects at least two of the solid state, liquid state and gas state. The fire extinguishing medium in the gas state and the liquid state can be combined, or the fire extinguishing medium in the solid state and the liquid state can be combined. Of course, the combination of three fire extinguishing media in the gas state, solid state and liquid state can also be selected.

[0035] As an implementation method, Figure 1 and Figure 2 As shown, the board body 1 includes a substrate 11 and a diffusion plate 12. Along the thickness direction D of the board body 1, the substrate 11 and the diffusion plate 12 are detachably connected. The fire extinguishing structure 2 is arranged on the substrate 11. The side of the diffusion plate 12 away from the substrate 11 is used to install the battery. The fire extinguishing medium is diffused outside the board body 1 through the diffusion plate 12.

[0036] As an implementation method, Figure 2As shown, the diffusion plate 12 is a tray-type structure, and a groove 123 is provided on the side of the diffusion plate 12 away from the plate body 1 for installing batteries to save space. Among them, multiple battery fire extinguishing devices can be stacked, and a battery is installed in the groove 123 of each diffusion plate 12, that is, a battery is sandwiched between two battery fire extinguishing devices to form a battery module; both sides of a single battery in the battery module are connected to a battery fire extinguishing device, and the plate body 1 can cool down the normally working battery and improve the working stability; when the battery catches fire, the battery fire extinguishing device can promptly spray out the fire extinguishing medium to cool down the abnormally working battery and extinguish the fire.

[0037] As an implementation method, Figure 3 and Figure 5 As shown, a slot 115 is provided on the substrate 11 , and a clamping edge 124 is provided at a position of the diffusion plate 12 corresponding to the slot 115 , and the diffusion plate 12 is inserted into the slot 115 through the clamping edge 124 .

[0038] As an implementation method, Figure 3 and Figure 4 As shown, the fire extinguishing structure 2 includes a flow channel 21 disposed on the substrate 11 , and the fire extinguishing medium flows in the flow channel 21 .

[0039] As an implementation method, Figures 1 to 4 and Figure 6 As shown, the flow channel 21 includes a gas flow channel 211 and a liquid flow channel 212. The gas flow channel 211 and the liquid flow channel 212 are arranged on the side of the substrate 11 close to the diffuser 12, so that the diffuser 12 can block the gas flow channel 211 and the liquid flow channel 212. The fire extinguishing medium includes a gas fire extinguishing agent and a coolant. The gas flow channel 211 is used to circulate the gas fire extinguishing agent, and the liquid flow channel 212 is used to circulate the coolant. Among them, the U-shaped groove-shaped liquid flow channel 212 is arranged on the substrate 11. When the diffuser 12 is connected and fixed to the substrate 11, the diffuser 12 can seal the liquid flow channel 212; or, a sealed serpentine liquid flow channel 212 is directly arranged on the substrate 11.

[0040] As an implementation method, Figures 1 to 3 As shown, an air inlet 113 is provided on the substrate 11 for introducing a gas fire extinguishing agent, and the air inlet 113 is connected to the gas flow channel 211; when the battery is abnormally heated, the gas fire extinguishing agent is injected into the gas flow channel 211 on the substrate 11 through the air inlet 113, and the gas fire extinguishing agent is then diffused through the diffusion plate 12.

[0041] As an implementation method, Figure 5 and Figure 6 As shown, a plurality of overflow ports 121 and / or overflow holes 122 are provided on the diffusion plate 12 at positions corresponding to the gas flow passages 211 , and the overflow ports 121 and the overflow holes 122 are used for the gas fire extinguishing agent to flow out.

[0042] Specifically, when the battery is working abnormally, if the battery is slightly heated, the battery cell remains in its original state without expansion and deformation. At this time, the battery temperature rises and is less than the set temperature (the set temperature is the thermal runaway temperature). First, the gas fire extinguishing agent is injected into the gas flow channel 211 on the substrate 11 through the air inlet 113, and the gas fire extinguishing agent diffuses to one side of the battery through the overflow port 121 and / or the overflow hole 122 on the diffuser plate 12, thereby dissipating heat and extinguishing the battery; if the battery temperature is controlled and drops to the normal temperature range, the gas fire extinguishing agent can be stopped from being introduced into the substrate 11, and the battery can continue to work normally. If the battery temperature continues to rise and is greater than the set temperature (the set temperature is the thermal runaway temperature), that is, the battery temperature is too high, the battery cell expands and deforms, and the coolant flows out from the liquid flow channel 212 into the gas flow channel 211, and then diffuses and flows out through the overflow port 121 and / or the overflow hole 122 on the diffuser plate 12, thereby cooling the battery and extinguishing the fire. Among them, when the battery is working normally and the temperature is normal, the liquid flow channel 212 stores coolant, and the substrate 11 acts as a cold plate to continuously cool the battery; the thermal runaway temperature refers to the critical temperature when the battery cell expands and deforms when the battery is working abnormally.

[0043] As an implementation method, Figures 1 to 3 As shown, the substrate 11 is provided with a liquid inlet 111 and a liquid outlet 112 for introducing or discharging a coolant. The liquid inlet 111 is connected to one end of the liquid flow channel 212, and the liquid outlet 112 is connected to the other end of the liquid flow channel 212. The coolant is injected into the liquid flow channel 212 on the substrate 11 through the liquid inlet 111, and the coolant serves as a heat dissipation medium for the battery. When the substrate 11 is used as a cooling plate, the coolant is injected into the substrate 11 through the liquid inlet 111, flows along the liquid flow channel 212, and is discharged through the liquid outlet 112 to cool the battery.

[0044] As an implementation method, Figure 3 and Figure 4 As shown, the gas flow channel 211 and the liquid flow channel 212 are independently arranged, and the gas flow channel 211 and the liquid flow channel 212 intersect to form a connection point. The fire extinguishing structure 2 also includes a temperature measuring structure, which is arranged at the connection point between the gas flow channel 211 and the liquid flow channel 212. When the temperature of the battery is greater than the set temperature, the temperature measuring structure is opened, and the coolant flows from the liquid flow channel 212 into the gas flow channel 211, and then overflows through the diffuser 12. The set temperature is the temperature when the battery is thermally runaway.

[0045] When the battery is working normally, the battery temperature is normal, and the plate 1 is used as a cooling plate to cool the battery so that the battery can maintain working stability; when the battery is working abnormally, the battery temperature rises, and the fire extinguishing structure 2 can select fire extinguishing media in different states according to the temperature of the battery to extinguish the fire, solving the problem that the existing fire extinguishing devices mostly use a single fire extinguishing medium for fire extinguishing, resulting in incomplete fire extinguishing or excessive battery loss. When a single gas medium is used for fire extinguishing, if the battery works abnormally and the temperature is greater than the set temperature (thermal runaway temperature), a single gas medium is used for fire extinguishing, and the fire extinguishing effect is general; when a single liquid medium is used for fire extinguishing, if the battery works abnormally and the temperature is less than the set temperature (thermal runaway temperature), the thermal runaway is controllable at this time, and a single liquid medium is used for fire extinguishing, and the battery is directly scrapped, causing greater losses.

[0046] As an implementation method, Figure 1-Figure 4 As shown, the temperature measuring structure is a temperature-sensitive glass liquid column 22. When the temperature of the battery is greater than the set temperature, the temperature-sensitive glass liquid column 22 is broken. Among them, a bracket 24 is provided on the gas flow channel 211 corresponding to the position of the temperature-sensitive glass liquid column 22, which is used to fix the temperature-sensitive glass liquid column 22. When the battery is working abnormally, if the battery is slightly heated, the battery core remains in its original state, and no expansion and deformation occurs, and the battery temperature rises but is less than the set temperature, the gas fire extinguishing agent is first injected into the gas flow channel 211 through an external gas injection device, and then the gas fire extinguishing agent is sprayed to the battery through the diffuser 12, which can reduce the battery temperature and inhibit the reaction; when the gas fire extinguishing agent cannot be effectively controlled, the temperature continues to rise and is greater than the set temperature, the temperature-sensitive glass liquid column 22 is broken, and at this time the liquid flow channel 212 is connected to the gas flow channel 211, and the coolant stored in the liquid flow channel 212 comes to the gas flow channel 211, and then overflows through the diffuser 12, so that the battery with thermal runaway can be immersed in the coolant to achieve a rapid fire extinguishing effect.

[0047] As an implementation method, Figure 1 , Figure 3 and Figure 4 As shown, the fire extinguishing structure 2 further includes a temperature detection line 23 . A mounting groove 114 is provided on the substrate 11 adjacent to the flow channel 21 . The temperature detection line 23 is installed in the mounting groove 114 to detect the temperature of the substrate 11 .

[0048] As an implementation method, Figures 1 to 3 As shown, a threading hole 116 is opened on the substrate 11 corresponding to the mounting groove 114, and one end of the temperature detection line 23 passes through the threading hole 116 and is placed outside the substrate 11, which can take into account the external ambient temperature of the board body 1, and the temperature control data is more comprehensive and accurate.

[0049] As an implementation method, Figure 3 and Figure 5As shown, the diffuser plate 12 is provided with a plurality of through holes 125, and the through holes 125 correspond one-to-one with the air inlet 113, the liquid inlet 111, the liquid outlet 112 and the threading hole 116, so that the fire extinguishing medium can enter and exit the substrate 11 through the through holes 125, avoiding the setting of the diffuser plate 12 affecting the realization of other functions.

[0050] As an implementation mode, the battery fire extinguishing device further includes a control module, which is connected to the temperature detection line 23 and an external gas injection device (not shown) and a liquid injection device (not shown), the gas injection device is connected to the gas inlet 113, and the liquid injection device is connected to the liquid inlet 111. Specifically, Figures 1 to 6 As shown, the temperature detection line 23 detects the temperature of the substrate 11. When the battery is working abnormally, the temperature detection line 23 detects that the temperature rises but is lower than the set temperature. The temperature detection line 23 transmits the information to the control module, and the control module starts the external gas injection device to inject the gas extinguishing agent into the corresponding gas flow channel 211. Then the gas extinguishing agent in the gas flow channel 211 is sprayed to the battery through the overflow port 121 and the overflow hole 122 on the diffusion plate 12, which can reduce the battery temperature and inhibit the reaction. When the gas extinguishing agent cannot be effectively controlled, the temperature The temperature continues to rise. When the temperature is greater than the set temperature, the gas injection device stops injecting the gas fire extinguishing agent, the temperature-sensitive glass liquid column 22 breaks, the liquid flow channel 212 is connected with the gas flow channel 211, and the coolant stored in the liquid flow channel 212 enters the gas flow channel 211, and then overflows through the overflow port 121 and the overflow hole 122 on the diffuser 12, and the control module controls the external liquid injection device to continuously inject coolant into the liquid flow channel 212 through the liquid inlet 111. The coolant continuously overflows, so that the battery with thermal runaway can be immersed in the coolant, which can quickly cool down and extinguish the fire.

[0051] The utility model arranges a fire extinguishing structure 2 in the plate body 1, and at least two states of fire extinguishing media can be introduced into the fire extinguishing structure 2. When the battery works normally and the temperature is normal, the plate body 1 is used as a cooling plate to cool the battery. When the battery works abnormally and the battery temperature rises, at least one state of fire extinguishing medium in the fire extinguishing structure 2 overflows to extinguish the battery. The utility model has high safety and can effectively reduce losses. In addition, a variety of fire extinguishing media are integrated, with a simple structure and high space utilization.

[0052] The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the profession can make some changes or modifications to the technical contents disclosed above without departing from the scope of the technical solution of the present invention, which are equivalent embodiments of equivalent changes. However, any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. A battery fire extinguishing device, characterized in that: The invention comprises a plate body (1) and a fire extinguishing structure (2), wherein the plate body (1) is used to contact a battery, and the fire extinguishing structure (2) is arranged in the plate body (1). At least two states of fire extinguishing medium can be introduced into the fire extinguishing structure (2). When the battery is working normally, the plate body (1) serves as a cooling plate to cool the battery; when the battery is working abnormally, at least one state of the fire extinguishing medium in the fire extinguishing structure (2) overflows from the plate body (1) to extinguish the fire of the battery.

2. The battery fire extinguishing device according to claim 1, characterized in that: The plate body (1) comprises a base plate (11) and a diffusion plate (12); along a thickness direction (D) of the plate body (1), the base plate (11) and the diffusion plate (12) are detachably connected; the fire extinguishing structure (2) is arranged on the base plate (11); a side of the diffusion plate (12) away from the base plate (11) is used for mounting the battery; and the fire extinguishing medium is diffused outside the plate body (1) through the diffusion plate (12).

3. The battery fire extinguishing device according to claim 2, characterized in that: The diffusion plate (12) is of a tray-type structure, and a groove (123) is provided on a side of the diffusion plate (12) away from the plate body (1) for installing a battery.

4. The battery fire extinguishing device according to claim 2, characterized in that: The base plate (11) is provided with a card slot (115), the diffuser plate (12) is provided with a card edge (124) at a position corresponding to the card slot (115), and the diffuser plate (12) is inserted into the card slot (115) via the card edge (124).

5. The battery fire extinguishing device according to claim 2, characterized in that: The fire extinguishing structure (2) comprises a flow channel (21) arranged on the substrate (11), and the fire extinguishing medium flows in the flow channel (21).

6. The battery fire extinguishing device according to claim 5, characterized in that: The flow channel (21) comprises a gas flow channel (211) and a liquid flow channel (212); the gas flow channel (211) and the liquid flow channel (212) are both arranged on a side of the substrate (11) close to the diffusion plate (12); the fire extinguishing medium comprises a coolant and a gaseous fire extinguishing agent; the gas flow channel (211) is used to circulate the gaseous fire extinguishing agent, and the liquid flow channel (212) is used to circulate the coolant.

7. The battery fire extinguishing device according to claim 6, characterized in that: The substrate (11) is provided with an air inlet (113) for introducing the gas fire extinguishing agent, and the air inlet (113) is in communication with the gas flow channel (211).

8. The battery fire extinguishing device according to claim 6, characterized in that: A plurality of overflow ports (121) and / or overflow holes (122) are provided on the diffusion plate (12) at positions corresponding to the gas flow channel (211).

9. The battery fire extinguishing device according to claim 6, characterized in that: The substrate (11) is provided with a liquid inlet (111) and a liquid outlet (112) for introducing or discharging a coolant, the liquid inlet (111) being connected to one end of the liquid flow channel (212), and the liquid outlet (112) being connected to the other end of the liquid flow channel (212).

10. The battery fire extinguishing device according to claim 6, characterized in that: The gas flow channel (211) and the liquid flow channel (212) are independently arranged, and the gas flow channel (211) and the liquid flow channel (212) intersect to form a connection point; the fire extinguishing structure (2) also includes a temperature measuring structure, and the temperature measuring structure is arranged at the connection point between the gas flow channel (211) and the liquid flow channel (212). When the battery operates abnormally and the temperature is greater than the set temperature, the temperature measuring structure is opened, and the coolant flows from the liquid flow channel (212) into the gas flow channel (211), and then overflows through the diffusion plate (12).

11. The battery fire extinguishing device according to claim 10, characterized in that: The temperature measurement structure is a temperature-sensitive glass liquid column (22), and when the temperature of the battery is greater than a set temperature, the temperature-sensitive glass liquid column (22) is broken.

12. The battery fire extinguishing device according to claim 5, characterized in that: The fire extinguishing structure (2) further comprises a temperature detection line (23); a mounting groove (114) is provided on the substrate (11) at a position adjacent to the flow channel (21); and the temperature detection line (23) is mounted in the mounting groove (114).

13. The battery fire extinguishing device according to claim 12, characterized in that: A threading hole (116) is provided on the base plate (11) at a position corresponding to the mounting groove (114), and one end of the temperature detection wire (23) passes through the threading hole (116) and is placed outside the base plate (11).

Images