Breathable balance valve with humidity stabilizing function

Abstract

The utility model discloses an air-permeable balance valve with a humidity stabilizing function, which comprises a valve body, a humidity stabilizing device and a humidity stabilizing device, the waterproof breathable module is arranged on the front side of the second mounting position; the moisture stabilizing module comprises a moisture absorption block used for absorbing moisture, the moisture absorption block is installed on the rear side of the second installation position and arranged behind the waterproof breathable module, a detachable protective net is further arranged at an opening in the rear side of the second installation position, the protective net is arranged behind the moisture absorption block, and the protective net is provided with a plurality of fourth through holes. The waterproof and breathable module achieves the functions of water resistance, breathability and air pressure balance; the humidity stabilizing module is arranged, the moisture absorption block of the humidity stabilizing module is used for absorbing moisture, the time for reaching the highest humidity can be delayed, the peak value of the highest humidity can be reduced, peak clipping and valley filling can be performed on the periodic change of the humidity, and the moisture in gas can be adsorbed according to the change of the humidity in the sealed box body of the battery pack; the internal humidity of the sealed box body of the battery pack is balanced, and condensation is prevented.

Description

Technical fields:

[0001] This utility model relates to the field of balance valve technology, and specifically to a breathable balance valve with moisture stabilization function. Background technology:

[0002] With the trend of vehicle electrification, the number of electric vehicles in my country has grown rapidly. However, at the same time, electric vehicle fires and combustion accidents occur frequently. Electric vehicle safety has become the fundamental guarantee for the continued healthy development of the new energy vehicle industry. To this end, relevant departments have recently released mandatory national standards for electric vehicles, such as "Safety Requirements for Electric Vehicles", "Safety Requirements for Electric Buses", and "Safety Requirements for Power Batteries for Electric Vehicles". The release and implementation of the above-mentioned mandatory national standards have put forward higher requirements for the electrical safety and functional safety, waterproofing, insulation performance, and battery thermal runaway of new energy vehicles.

[0003] The battery pack, electronic control system, and motor of an electric vehicle are the core components of a new energy electric vehicle, and their safety and reliability are of paramount importance. To ensure their safe and stable operation, they need to be waterproof and dustproof, that is, theoretically, completely sealed. However, in a completely sealed state, if an internal short circuit, battery overcharging or over-discharging, or other abnormal thermal runaway occurs, a large amount of high-temperature, high-pressure gas will be generated and accumulated. At the same time, a large amount of solid-gas mixture containing solid or gelatinous substances will also be generated. If it cannot be discharged in time, it will usually cause violent fire, combustion, and explosion, resulting in significant casualties and property damage.

[0004] Therefore, the current approach is to install one or more waterproof, breathable, and explosion-proof valves on power system components such as battery packs to waterproof and prevent explosions in the power battery system, thereby preventing or reducing casualties and property losses caused by sudden abnormal accidents such as deflagration and explosion inside the battery pack.

[0005] For example, Chinese utility model patent application number 202322821060.7 discloses a breathable explosion-proof pressure relief valve, including a shell body, a core seat, a sealing cover, an elastic element, and a breathable membrane. The core seat and the sealing cover are fixedly connected to form a movable core, which can move axially relative to the shell body. The elastic element is installed between the movable core and the shell body, and applies elastic force to the movable core. When the air pressure has not exceeded the set value, the elastic element causes the sealing cover to contact the shell body to form a seal. At this time, air flows through the vent and the breathable membrane, which is used to achieve ventilation when the air pressure has not exceeded the set value. When the air pressure exceeds the set value, the air pressure pushes the movable core to squeeze the elastic element, thereby separating it from the shell body to release pressure and allow the gas to be discharged quickly. Ventilation is achieved when the internal and external pressure difference is small, and rapid exhaust is achieved when the internal and external pressure difference is too large.

[0006] However, although the aforementioned breathable and explosion-proof pressure relief valve can achieve the functions of pressure relief and explosion prevention, as well as waterproofing and breathability to balance air pressure, it cannot achieve the function of humidity stabilization. That is, it cannot balance the humidity inside the sealed housing of the battery pack, which can easily lead to condensation inside the sealed housing of the battery pack.

[0007] In view of the above, the inventors propose the following technical solution. Utility Model Content:

[0008] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a breathable balance valve with a moisture stabilization function.

[0009] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The breathable balance valve with moisture stabilization function includes: a valve body, which is provided with a second mounting position; a waterproof and breathable module, which is provided in front of the second mounting position; and a moisture stabilization module, which includes a moisture-absorbing block for absorbing moisture, the moisture-absorbing block is installed in the rear of the second mounting position and placed behind the waterproof and breathable module, and a detachable protective net is also provided at the opening in the rear of the second mounting position, the protective net is placed behind the moisture-absorbing block, and the protective net has a plurality of fourth through holes.

[0010] Furthermore, in the above technical solution, the waterproof and breathable module includes a waterproof and breathable membrane disposed on the front side of the second mounting position and covering the opening on the front side of the second mounting position, and a protective cover disposed on the front side of the second mounting position and covering the periphery of the waterproof and breathable membrane. The protective cover is provided with a plurality of breathable holes penetrating its outer surface.

[0011] Furthermore, in the above technical solution, the valve body has a first recessed groove at the front end that connects to the second mounting position. The front opening of the second mounting position has a raised convex ring. The waterproof and breathable membrane is attached and fixed to the surface of the convex ring. The protective cover is sleeved and fixed to the outside of the convex ring and presses down the waterproof and breathable membrane. A breathable gap with a connecting vent is formed between the outer surface of the protective cover and the inner wall of the first recessed groove.

[0012] Furthermore, in the above technical solution, the waterproof and breathable module also includes a moisture-blocking component, which is embedded and fixed in the second mounting position and located on the rear side of the waterproof and breathable membrane.

[0013] Furthermore, in the above technical solution, the moisture-blocking component includes a moisture-blocking seat embedded and fixed to the rear side of the second mounting position, a first moisture-blocking sheet disposed on the rear side of the moisture-blocking seat and capable of elastic deformation, and a second moisture-blocking sheet disposed on the front side of the moisture-blocking seat and capable of elastic deformation. The moisture-blocking seat has a plurality of first vent holes and second vent holes that pass through the front and rear ends. The outer edge of the first moisture-blocking sheet covers the first vent hole, and the outer edge of the second moisture-blocking sheet covers the second vent hole.

[0014] Furthermore, in the above technical solution, the moisture-absorbing block is flame-retardant moisture-absorbing cotton; or, the moisture-absorbing block includes a box with through holes and a plurality of desiccants disposed inside the box.

[0015] Furthermore, in the above technical solution, an alarm module is also provided in the second mounting position. The alarm module includes a PCB board fixed in the second mounting position and a sensor mounted on the PCB board. The sensor is at least one of a pressure sensor, a temperature sensor, a humidity sensor, and a gas concentration sensor.

[0016] Furthermore, in the above technical solution, the protective net has a window, and a plug with a wire passes through the window and connects with a socket on the PCB board.

[0017] After adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art: This utility model sets an independent waterproof and breathable module on a valve body, which achieves waterproof and breathable functionality to balance air pressure; this utility model also sets a humidity stabilizing module on the valve body, whose moisture-absorbing block absorbs moisture, delaying the time to reach the highest humidity and reducing the peak humidity level, thus smoothing out peaks and valleys in humidity periodic changes. It can also absorb moisture from the gas according to humidity changes inside the sealed casing of the battery pack, balancing the humidity inside the sealed casing and preventing condensation. Furthermore, this utility model also sets a protective net behind the humidity stabilizing module, which provides good protection. Attached image description:

[0018] Figure 1 This is a perspective view of the present invention;

[0019] Figure 2 This is a perspective view of the present invention from another angle;

[0020] Figure 3 This is an exploded view of this utility model;

[0021] Figure 4 This is a perspective view of the flame-arresting module in this utility model;

[0022] Figure 5 This is a perspective view of the flame-arresting module in this utility model from another angle;

[0023] Figure 6 This is a perspective view of the moisture-blocking component in this utility model;

[0024] Figure 7 This is a perspective view of the moisture-blocking component in this utility model.

[0025] Figure 8 This is a cross-sectional view of the present invention;

[0026] Figure 9 This is a cross-sectional view of the moisture-blocking component in this utility model;

[0027] Figure 10 This is a cross-sectional view of a portion of the structure of this utility model;

[0028] Figure 11 This is a cross-sectional view of another part of the structure of this utility model;

[0029] Figure 12 This is a perspective view of the valve body in this utility model;

[0030] Figure 13 This is a perspective view of the valve body from another angle in this utility model. Detailed implementation method:

[0031] The present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0032] See Figure 1-13 As shown, a breathable balance valve with moisture stabilization function is provided, which includes: valve body 1, waterproof and breathable module 3, and moisture stabilization module 4.

[0033] This utility model has waterproof and breathable properties, and adds an explosion-proof valve module 2, which realizes the pressure relief and explosion-proof function, making this utility model a multi-functional waterproof and breathable explosion-proof valve.

[0034] In this embodiment, the valve body 1 is die-cast from aluminum alloy, which has high structural strength and long service life. Of course, in other embodiments, the valve body 1 can also be made of other hard materials, such as hard plastic or other metal materials.

[0035] A stepped groove 15 is provided on the rear side of the valve body 1. An annular groove 16 is provided in the stepped groove 15. A second sealing ring 10 is provided in the annular groove 16. When this utility model is installed on the sealed housing of the battery pack, it is installed by being embedded in the stepped groove 15 on the rear side of the valve body 1. After the screw passes through the through hole on the outer edge of the valve body 1, it is locked with the sealed housing of the battery pack. The second sealing ring 10 achieves internal and external sealing installation.

[0036] The valve body 1 is provided with a first mounting position 11 and a second mounting position 12 that are spaced apart and arranged side by side.

[0037] The explosion-proof valve module 2 is located on the front side of the first mounting position 11. It is used to quickly release pressure when the internal and external pressure difference is large and exceeds the set value, thereby achieving the purpose of explosion protection. This is the pressure relief and explosion protection function of a conventional explosion-proof valve.

[0038] Specifically, the explosion-proof valve module 2 includes a bracket 21 disposed in the first mounting position 11, a valve core 22 slidably inserted in the bracket 21, and a spring 23 disposed between the valve core 22 and the bracket. One end of the spring 23 abuts against the bracket 21, and the other end abuts against the flange 222 at the end of the rod 221 of the valve core 22. The rod 221 passes through the bracket 21, and a pressure relief hole 20 is formed between the bracket 21 and the inner wall of the first mounting position 11. A first sealing ring 24 is formed between the valve core 22 and the front opening of the first mounting position 11. Under the elastic force of the spring, the valve core 22 presses the first sealing ring 24 to seal the front opening of the first mounting position 11. Under normal conditions, when the pressure difference between the inside and outside of the sealed housing of the battery pack does not exceed the set value, the valve core 22, under the elastic force of the spring, presses the first sealing ring 24 to seal the front opening of the first mounting position 11, thereby achieving the purpose of sealing the first mounting position 11. When the pressure difference between the inside and outside of the sealed housing of the battery pack exceeds the set value, the valve core 22 moves outward relative to the valve body 1 under pressure and compresses the spring. At this time, the valve core 22 leaves the front opening of the first mounting position 11 to form a pressure relief interval. At this time, the pressure inside the sealed housing is quickly relieved through the pressure relief hole 20 and then through the pressure relief interval. After the pressure relief is completed, the spring returns to its original position to generate elastic force, which in turn drives the valve core 22 to return to its original position. Under the elastic force of the spring, the valve core 22 re-presses the first sealing ring 24 to seal the front opening of the first mounting position 11, thereby achieving the purpose of sealing the first mounting position 11.

[0039] The waterproof and breathable module 3 is located on the front side of the second installation position 12. It is used to achieve air permeability when the internal and external pressure difference is small, so as to achieve air pressure balance. This is the function of waterproof and breathable valve to balance air pressure.

[0040] Specifically, the waterproof and breathable module 3 includes a waterproof and breathable membrane 31 disposed on the front side of the second mounting position 12 and covering the opening on the front side of the second mounting position 12, and a protective cover 32 disposed on the front side of the second mounting position 12 and covering the periphery of the waterproof and breathable membrane 31. The protective cover 32 is provided with multiple vent holes 321 penetrating its outer surface. The waterproof and breathable membrane 31 has waterproof and breathable functions, which is a conventional technology. When the waterproof and breathable module 3 is working, the sealed housing of the battery pack is connected to the outside through the vent holes 321 of the waterproof and breathable membrane 31 and the protective cover 32, thereby achieving free ventilation and realizing the air pressure balance between the inside of the sealed housing and the outside. The protective cover 32 can protect the waterproof and breathable membrane 31 and prevent it from being accidentally punctured. At the same time, the protective cover 32 also has a dustproof function, which can effectively prevent dust from falling directly onto the waterproof and breathable membrane 31, ensuring the waterproof and breathable effect of the waterproof and breathable membrane 31.

[0041] The valve body 1 has a first recessed groove 13 at its front end that connects to the second mounting position 12. The second mounting position 12 has a raised ring body 14 at its front opening. The waterproof and breathable membrane 31 is attached and fixed to the surface of the ring body 14. The protective cover 32 is sleeved and fixed to the outside of the ring body 14 and presses down the waterproof and breathable membrane 31. The assembly structure is more stable and improves the quality of the product. Furthermore, a breathable gap 320 with a breathable hole 321 is formed between the outer surface of the protective cover 32 and the inner wall of the first recessed groove 13, thereby forming a tortuous breathable channel, which has a better dustproof effect.

[0042] The ventilation hole 321 has a shape that is small on the outside and large on the inside, which can effectively prevent foreign objects from entering.

[0043] The waterproof and breathable module 3 further includes a moisture-blocking component 33, which includes a moisture-blocking seat 331 embedded and fixed to the rear side of the second mounting position 12, a first moisture-blocking sheet 332 disposed on the rear side of the moisture-blocking seat 331 and capable of elastic deformation, and a second moisture-blocking sheet 333 disposed on the front side of the moisture-blocking seat 331 and capable of elastic deformation. The moisture-blocking seat 331 has a plurality of first vent holes 301 and second vent holes 302 penetrating the front and rear ends. The outer edge of the first moisture-blocking sheet 332 covers the first vent hole 301, and the outer edge of the second moisture-blocking sheet 333 covers the second vent hole 302.

[0044] Both the first moisture barrier 332 and the second moisture barrier 333 can be made of rubber sheets capable of elastic deformation.

[0045] When the internal air pressure of the sealed housing of the battery pack is lower than the external air pressure, the outer edge of the first moisture-blocking sheet 332 is sucked up. At this time, the outer edge of the first moisture-blocking sheet 332 no longer covers the first exhaust hole 301, and the first exhaust hole 301 is in a conductive state to achieve ventilation. Meanwhile, the outer edge of the second moisture-blocking sheet 333 still covers the second exhaust hole 302, so that the second exhaust hole 302 is in a non-conductive state. When the internal and external air pressures are balanced, the first moisture-blocking sheet 332 returns to its original position to cover the first exhaust hole 301 again, thereby achieving the purpose of moisture blocking and ventilation. When the internal air pressure of the sealed housing of the battery pack is greater than the external air pressure, the outer edge of the second moisture-proof sheet 333 is sucked up. At this time, the outer edge of the second moisture-proof sheet 333 no longer covers the second exhaust hole 302, and the second exhaust hole 302 is in a conductive state to achieve ventilation. Meanwhile, the outer edge of the first moisture-proof sheet 332 still covers the first exhaust hole 301, making the first exhaust hole 301 non-conductive. When the internal and external air pressures are balanced, the second moisture-proof sheet 333 resets to cover the second exhaust hole 302 again, thereby achieving the purpose of moisture blocking and ventilation.

[0046] The humidity stabilization module 4 includes a moisture-absorbing block 41 for absorbing moisture. The moisture-absorbing block 41 is installed on the rear side of the first mounting position 11 and / or the rear side of the second mounting position 12. The moisture-absorbing block 41 absorbs moisture, which can delay the time to reach the highest humidity and reduce the peak value of the highest humidity. It can smooth out the peaks and fill the valleys of the periodic humidity changes. It can adsorb moisture in the gas according to the humidity changes inside the sealed box of the battery pack, balance the humidity inside the sealed box of the battery pack, and prevent condensation.

[0047] Specifically, in this embodiment, there are two moisture-absorbing blocks 41. The first moisture-absorbing block 41 is embedded and installed on the rear side of the first mounting position 11, and the flame-retardant module 5 is located on the rear side of the first moisture-absorbing block 41. The second moisture-absorbing block 41 is embedded and installed on the rear side of the second mounting position 12 and is located on the rear side of the waterproof and breathable module 3, so that the present invention has an extremely ideal moisture-absorbing effect.

[0048] The moisture-absorbing block 41 is made of flame-retardant moisture-absorbing cotton; or, the moisture-absorbing block 41 includes a box with through holes and a plurality of desiccants disposed inside the box, wherein the box is made of flame-retardant material. Of course, the moisture-absorbing block 41 can also be made of other moisture-absorbing materials.

[0049] The flame arrestor module 5 is located at the rear opening of the first mounting position 11 and behind the explosion-proof valve module 2. The flame arrestor module 5 includes at least two layers of first flame arrestor mesh 51 and second flame arrestor mesh 52 spaced apart. The first flame arrestor mesh 51 has a plurality of first through holes 511, and the second flame arrestor mesh 52 has a plurality of second through holes 521, with the first through holes 511 and second through holes 521 staggered. When thermal runaway occurs in the sealed enclosure of the battery pack, the flame arrestor module 5 effectively prevents open flames inside the sealed enclosure from erupting outwards, while ensuring that gas can be smoothly discharged, facilitating rapid pressure relief via the explosion-proof valve module 2 to achieve the explosion-proof function.

[0050] The fire-resistant module 5 rests against the rear side of the first moisture-absorbing block 41, which also prevents the first moisture-absorbing block 41 from falling out.

[0051] The fire-arresting module 5 also includes a third fire-arresting mesh 53 located behind the second fire-arresting mesh 52. The third fire-arresting mesh 53 has a plurality of third through holes 531, and the third through holes 531 are staggered with the second through holes 521. The diameter of the third through holes 531 is the same as that of the first through holes 511, and is larger than that of the second through holes 521. The third through holes 531 and the first through holes 511 overlap in the projection direction and are distributed on the same straight line. The projections of the first through holes 511 and the third through holes 531 do not overlap, which can achieve a more ideal fire-arresting effect.

[0052] The outer sides of the first fire-resistant mesh 51, the second fire-resistant mesh 52, and the third fire-resistant mesh 53 are fixed together by connecting pieces 54 to form a whole for installation.

[0053] Furthermore, the outer edge of the third fire-resistant mesh 53 protrudes beyond the first fire-resistant mesh 51 and the second fire-resistant mesh 52.

[0054] The first mounting position 11 has a second recess 111 at its rear opening. The outer edge of the third fireproof mesh 53 is embedded in the second recess 111 and secured with screws 50.

[0055] The second mounting position 12 is also equipped with an alarm module 6. When the alarm module 6 monitors various changes inside the battery pack, it can sound an alarm when an abnormality is detected.

[0056] Specifically, the alarm module 6 includes a PCB board 61 fixed in the second mounting position 12 and a sensor 62 mounted on the PCB board 61. The sensor 62 is at least one of a pressure sensor, a temperature sensor, a humidity sensor, and a gas concentration sensor, so as to detect pressure changes, temperature changes, humidity changes, and special gas concentrations.

[0057] A detachable protective net 7 is also provided at the rear opening of the second mounting position 12. The protective net 7 has a plurality of fourth through holes 71 and a window 72. The plug 8 with the wire 81 passes through the window 72 and is connected to the socket 63 on the PCB board 61. The protective net 7 can play a protective role. At the same time, the protective net 7 also abuts against the rear side of the second moisture-absorbing block 41, which can prevent the second moisture-absorbing block 41 from falling out.

[0058] In summary, this invention features an independent waterproof and breathable module 3 on a valve body, which enables waterproofing and breathability to balance air pressure. Furthermore, a humidity-stabilizing module 4 is also installed on the valve body. The moisture-absorbing block 41 of the humidity-stabilizing module 4 absorbs moisture, delaying the time to reach peak humidity and reducing the peak humidity level. This helps to smooth out humidity fluctuations and prevent condensation by adsorbing moisture from the gas and balancing the humidity inside the sealed battery pack enclosure. Additionally, a protective net is installed behind the humidity-stabilizing module 4, providing excellent protection.

[0059] Furthermore, this utility model can design the explosion-proof valve module 2, waterproof and breathable module 3, moisture-stabilizing module 4, flame-arresting module 5, and alarm module 6 as modular designs, which are integrated on the valve body to achieve different functions at the same time, forming a multi-functional waterproof and breathable explosion-proof valve. As a result, this utility model has multiple functions, and different configurations can be selected according to actual usage to meet different usage requirements.

[0060] Of course, the above description is only a specific embodiment of the present utility model and is not intended to limit the scope of the present utility model. All equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model should be included in the scope of the claims of the present utility model.

Claims

1. A moisture-stable and breathable balance valve, comprising: a valve body (1) provided with a second mounting position (12); a waterproof and breathable module (3) arranged in front of the second mounting position (12); characterized in that: a moisture-stable module (4) is further included, the moisture-stable module (4) comprising a moisture-absorbing block (41) for absorbing moisture, the moisture-absorbing block (41) being mounted at the rear side of the second mounting position (12) and placed behind the waterproof and breathable module (3), and a detachable protective net (7) being further arranged at the opening of the rear side of the second mounting position (12), the protective net (7) being placed behind the moisture-absorbing block (41), and the protective net (7) having a plurality of fourth through holes (71).

2. The breather balanced valve with moisture stabilization function according to claim 1, characterized in that: The waterproof and breathable module (3) comprises a waterproof and breathable film (31) arranged in front of the second mounting position (12) and covering the opening of the front side of the second mounting position (12), and a protective cover (32) arranged in front of the second mounting position (12) and covering the periphery of the waterproof and breathable film (31), the protective cover (32) being provided with a plurality of air holes (321) penetrating through the outer side surface thereof.

3. The breather balanced valve with moisture stabilization function according to claim 2, characterized in that: The valve body (1) is provided at the front end thereof with a first sink (13) communicating with the second mounting position (12), the front side of the second mounting position (12) is provided with a protruding convex ring body (14), the waterproof and breathable film (31) is fixedly attached to the surface of the convex ring body (14), the protective cover (32) is fixedly sleeved on the outside of the convex ring body (14) and presses the waterproof and breathable film (31), and a ventilation gap (320) communicating with the air holes (321) is formed between the outer surface of the protective cover (32) and the inner wall of the first sink (13).

4. The breather balanced valve with moisture stabilization function according to claim 2, characterized in that: The waterproof and breathable module (3) further comprises a moisture-blocking assembly (33) inlaid and fixed in the second mounting position (12) and located at the rear side of the waterproof and breathable film (31).

5. The breather balanced valve with moisture-stabilizing function according to claim 4, characterized in that: The moisture-blocking assembly (33) comprises a moisture-blocking seat (331) inlaid and fixed at the rear side of the second mounting position (12), a first moisture-blocking sheet (332) arranged at the rear side of the moisture-blocking seat (331) and capable of elastically deforming, and a second moisture-blocking sheet (333) arranged at the front side of the moisture-blocking seat (331) and capable of elastically deforming, the moisture-blocking seat (331) has a plurality of first exhaust holes (301) and second exhaust holes (302) penetrating through the front and rear ends, the outer edge of the first moisture-blocking sheet (332) covers the first exhaust holes (301), and the outer edge of the second moisture-blocking sheet (333) covers the second exhaust holes (302).

6. The breather equalizing valve with moisture stabilizing function according to any one of claims 1-5, characterized in that: The moisture-absorbing block (41) is fire-retardant moisture-absorbing cotton, or the moisture-absorbing block (41) comprises a box body with through holes and a plurality of desiccants arranged in the box body.

7. The breather balanced valve with moisture-stabilizing function according to any one of claims 1-5, characterized in that: An alarm module (6) is further arranged in the second mounting position (12), the alarm module (6) comprising a PCB board (61) fixed in the second mounting position (12) and a sensor (62) mounted on the PCB board (61), the sensor (62) being at least one of a pressure sensor, a temperature sensor, a humidity sensor, and a gas concentration sensor.

8. The breather balanced valve with moisture-stable function according to claim 7, characterized in that: The protective net (7) is provided with a window (72), and the plug (8) with a lead wire (81) is plugged into the socket (63) on the PCB (61) through the window (72) to realize conduction.

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