A connection structure for the frame of a battery pack housing for new energy vehicles

Abstract

This invention belongs to the field of battery manufacturing technology, specifically a connection structure for the frame of a battery pack housing for new energy vehicles. It includes a water-cooled connection assembly, which comprises a base plate with flow channel ports at both ends. A water-cooled sealing strip is installed within each flow channel port. The water-cooled sealing strip, made of rubber, has a stepped recessed buffer cavity in the middle and an inverted conical structure formed by two inclined surfaces at its head. The interference fit between the sealing strip and the channel creates multiple sealing surfaces, maintaining partial sealing even if some loosening occurs. This also enhances friction with the inner wall of the channel, effectively reducing the risk of condensate leakage. The outer surface of the water-cooled sealing strip has diagonal anti-slip stripes, which can mechanically engage with the inner wall of the flow channel port, reducing axial movement and further improving structural stability.

Description

Technical Field

[0001] This invention belongs to the field of battery manufacturing technology, specifically a connection structure for the frame of a battery pack housing for new energy vehicles. Background Technology

[0002] The battery pack housing of a new energy vehicle is the core load-bearing and protective component of the power battery system. It is mainly used to encapsulate core components such as cell modules, battery management systems, and cooling systems. It not only provides a stable mounting base for each component to ensure a neat layout, but also resists mechanical impacts such as external collisions, compression, and vibration, and isolates water, dust, and foreign objects from intrusion. At the same time, it has heat insulation and flame-retardant properties to adapt to different temperature and humidity and complex road conditions. The housing is mostly made of aluminum alloy, high-strength steel, or composite materials, taking into account both lightweight and structural strength. The structural design needs to fit the overall vehicle chassis layout and optimize the impact resistance and deformation resistance.

[0003] In existing technologies, the battery pack housing is mainly composed of components such as the frame, base plate, panel, crossbeam, and wiring harness bracket. The water cooling channels are often sealed with square sealing strips. However, the welding process of square sealing strips is prone to deformation, resulting in warping at both ends. Therefore, the sealing strips need to be pre-fixed by laser welding, which affects the production efficiency of the battery pack housing. After the square sealing strips are welded to the battery pack frame, the water cooling channels are mostly milled from inside the frame, making the structure relatively stable. However, the welded parts of the sealing strips are prone to aging after long-term vibration or temperature cycling, which may cause condensate leakage. Furthermore, as a core load-bearing component, the battery pack frame will transfer stress to the water cooling channels when subjected to vehicle vibration and external impact. Over time, this may not only cause cracking of the channel welds but also gradually thin the inner wall of the channels, ultimately affecting the heat dissipation efficiency of the battery pack. Summary of the Invention

[0004] To address the shortcomings of existing technologies, such as the need for pre-fixing of sealing strips via laser welding which affects the production efficiency of the battery pack housing, the aging of welded parts of the sealing strips after long-term vibration or temperature cycling which may lead to condensate leakage, and the fact that the battery pack frame, as a core load-bearing component, transmits stress to the water-cooling channels when subjected to vehicle vibration and external impacts, which may not only cause cracking of the channel welds over time but also gradually thin the inner wall of the channel, ultimately affecting the heat dissipation efficiency of the battery pack, this invention proposes a connection structure for the battery pack housing frame of new energy vehicles.

[0005] The technical solution adopted by this invention to solve its technical problem is: a connection structure for the frame of a new energy vehicle battery pack, comprising:

[0006] A water-cooled connection assembly includes a base plate with flow channel ports at both ends. A water-cooled sealing strip is provided inside the flow channel ports. The upper and lower sides of the water-cooled sealing strip are provided with inclined surfaces, and a buffer cavity is formed between the inclined surfaces and the flow channel ports to serve as a buffer space for the thermal expansion of the condensate. A buffer cavity is provided inside the water-cooled sealing strip, and a spring is radially provided inside the buffer cavity. The spring continuously provides radial preload force to both ends of the water-cooled sealing strip.

[0007] A crossbeam connecting assembly includes side frames symmetrically arranged on both sides of a water-cooled connecting assembly, a central crossbeam between the two side frames, and two side crossbeams symmetrically arranged on both sides between the two side frames. The bottom of the central crossbeam and the side crossbeams is coated with structural adhesive, and the connection between the structural adhesive and the base plate forms the bottom load-bearing structure of the central crossbeam and the side crossbeams.

[0008] Preferably, a water-cooled flow channel is provided in the base plate, and the water-cooled flow channel is connected to the flow channel port.

[0009] Preferably, the water-cooled sealing strip has grooves on both the upper and lower sides, and a buffer cavity is formed between the grooves and the flow channel port. The water-cooled sealing strip has anti-slip stripes on both the upper and lower sides.

[0010] Preferably, a front panel is fixedly connected to one end of the base plate, and the front panel is provided with a discharge connection hole, a communication connection hole and a charging connection hole.

[0011] Preferably, a rear panel is fixedly connected to the side of the base plate away from the front panel, and an explosion-proof valve mounting hole is provided on the rear panel.

[0012] Preferably, a transition connecting plate is provided on the top of the base plate, and multiple wire harness brackets are fixedly connected to the transition connecting plate. The bottom of the transition connecting plate is coated with structural adhesive.

[0013] Preferably, each of the two side frames has three mounting slots, and the middle crossbeam and the side crossbeams have mounting slots, with the mounting slots slidably connected to each other.

[0014] Preferably, both ends of the central crossbeam and the side crossbeam are provided with connecting panels, the connecting panels are provided with rivets, and the connecting panels are internally threaded with mounting bolts.

[0015] Preferably, the rivet passes through one end of the connecting panel and is riveted to the central crossbeam and the side crossbeam, and the mounting bolt passes through one end of the connecting panel and is threaded to the side frame.

[0016] Preferably, a water inlet is fixedly connected to one side of the base plate, and a water outlet is fixedly connected to the side of the base plate away from the water inlet. Both the water inlet and the water outlet are connected to the water cooling channel.

[0017] The beneficial effects of this invention are as follows:

[0018] 1. The connection structure of the battery pack box frame of a new energy vehicle described in this invention adopts a water-cooled sealing strip made of rubber. Its diameter is slightly larger than the inlet of the flow channel port. A buffer cavity is formed by a stepped recess in the middle. The head is formed by two inclined surfaces to form an inverted cone structure. During assembly, the sealing strip and the channel form multiple sealing surfaces by interference fit. Even if there is local loosening, it can still maintain a partial sealing effect. At the same time, it enhances the friction with the inner wall of the channel, effectively reducing the risk of condensate leakage. The outer surface of the water-cooled sealing strip is provided with oblique anti-slip stripes, which can form a mechanical engagement with the inner wall of the flow channel port, reduce axial movement, and further improve structural stability.

[0019] 2. The connection structure of the battery pack box frame of a new energy vehicle described in this invention features a water-cooled sealing strip made of rubber with an embedded annular metal spring. The spring's rebound force continuously compresses both ends of the sealing strip, ensuring that it always fits tightly against the inner wall of the channel. This counteracts the elastic decay caused by rubber aging and provides a sustained radial preload. A buffer cavity is formed between the inclined surface of the sealing strip head and the bottom of the flow channel port, serving as a buffer space for the thermal expansion of the condensate. This absorbs some of the instantaneous impact force, reduces the impact load on the inner wall of the channel, and extends the service life of the water-cooled flow channel.

[0020] 3. The connection structure of the battery pack frame of a new energy vehicle described in this invention achieves multiple fixation by setting structural adhesive at the bottom of the transition connecting plate, the middle crossbeam, and the side crossbeams. The wiring harness bracket is first welded to the transition connecting plate, and then the transition connecting plate is fixed to the base plate by the structural adhesive. The welding points of the wiring harness bracket and the base plate are transferred to the transition connecting plate, reducing the overall number of welding points and improving the yield rate. In terms of the load-bearing structure, the middle crossbeam and the side crossbeams jointly bear the load through the bottom structural adhesive, the side mounting groove, and the arc welding points. Compared with the traditional side welding method, it achieves coordinated stress on both sides and the bottom, and significantly improves the overall strength of the battery pack frame without increasing the number of welding points. Attached Figure Description

[0021] The invention will now be further described with reference to the accompanying drawings.

[0022] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a top view of the overall structure of the present invention;

[0024] Figure 3This is a cross-sectional schematic diagram of the water-cooled flow channel structure inside the base plate of the present invention;

[0025] Figure 4 This is a three-dimensional schematic diagram of the structure of the flow channel port and the water-cooled sealing strip of the present invention;

[0026] Figure 5 This is a three-dimensional schematic diagram of the water-cooled sealing strip and anti-slip stripe structure of the present invention;

[0027] Figure 6 This is a cross-sectional schematic diagram of the internal structure of the water-cooled sealing strip of the present invention;

[0028] Figure 7 This is a three-dimensional schematic diagram of the beam connection component structure of the present invention;

[0029] Figure 8 This is a three-dimensional schematic diagram of the crossbeam connection component structure of the present invention in use;

[0030] Figure 9 This is a schematic diagram of the transition connecting plate structure of the present invention;

[0031] Figure 10 This is a schematic diagram of the front panel structure of the present invention;

[0032] Figure 11 This is a schematic diagram of the rear panel structure of the present invention.

[0033] In the picture:

[0034] 100. Water-cooled connection assembly; 110. Base plate; 111. Water-cooled flow channel; 112. Flow channel port; 113. Water inlet; 114. Water outlet; 120. Water-cooled sealing strip; 121. Bevel; 122. Buffer chamber one; 123. Groove; 124. Buffer chamber two; 125. Anti-slip stripe; 126. Buffer chamber three; 127. Spring; 130. Transition connection plate; 131. Wiring harness bracket; 140. Front panel; 141. Discharge connection hole; 142. Communication connection hole; 143. Charging connection hole; 150. Rear panel; 151. Explosion-proof valve mounting hole;

[0035] 200. Crossbeam connecting assembly; 210. Side frame; 211. Mounting slot one; 220. Middle crossbeam; 221. Mounting slot two; 230. Side crossbeam; 240. Connecting panel; 241. Rivet; 242. Mounting bolt. Detailed Implementation

[0036] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0037] like Figure 1As shown, this embodiment discloses a connection structure for the frame of a battery pack housing for a new energy vehicle, including a water-cooled connection component 100 and a crossbeam connection component 200, with the crossbeam connection component 200 disposed on both sides of the water-cooled connection component 100.

[0038] Furthermore, in the existing battery pack housing frame assembly, square sealing strips are often used to seal the water-cooling structure. However, the welding process of square sealing strips is prone to deformation, resulting in the ends lifting up. Therefore, the sealing strips need to be pre-fixed by laser welding, which affects the production efficiency of the battery pack housing. After the square sealing strips are welded to the battery pack frame, since the water-cooling structure is mostly milled from the inside of the frame, the structure itself is relatively stable. However, the welded parts of the sealing strips are prone to aging after long-term vibration or temperature cycling, which may cause condensate leakage. Moreover, as a core load-bearing component, the battery pack frame will transfer stress to the water-cooling structure when subjected to vehicle vibration and external impact. Under long-term action, this may not only cause cracking of the flow channel welds, but also cause the inner wall of the flow channel to gradually thin, ultimately affecting the heat dissipation efficiency of the battery pack.

[0039] During use, the water-cooled sealing strip 120, with a diameter slightly larger than the inlet of the flow channel port 112, features a stepped buffer cavity 124 recessed in its middle and an inverted conical structure formed by two inclined surfaces 121 at its head. During assembly, the interference fit between the water-cooled sealing strip 120 and the flow channel port 112 creates multiple sealing surfaces, maintaining partial sealing even with localized loosening. This also increases friction with the inner wall of the channel, reducing the risk of condensate leakage from the water-cooled flow channel 111. The outer surface of the rubber plug has oblique anti-slip stripes 125 that mechanically engage with the inner wall of the flow channel port 112, reducing axial movement and increasing the stability of the water-cooled sealing strip 120. Inside the rubber plug… An embedded annular metal spring 127 is used to continuously compress both ends of the water-cooled sealing strip 120 using the spring's rebound force, ensuring that both ends of the water-cooled sealing strip 120 are always tightly fitted with the flow channel port 112. This counteracts the elasticity decay caused by rubber aging and continuously provides radial preload. Furthermore, there is a buffer cavity 122 formed between the water-cooled sealing strip 120 and the bottom of the flow channel port 112, which serves as a buffer space when the condensate expands thermally. This reduces the instantaneous impact force on the rubber plug. After absorbing part of the instantaneous impact force when the condensate expands thermally, it reduces the impact on the inner wall of the flow channel port 112 when the condensate expands thermally, thereby extending the service life of the water-cooled flow channel 111.

[0040] like Figure 3 As shown, the water-cooled connection assembly 100 includes a base plate 110, a water-cooled flow channel 111 formed within the base plate 110, and flow channel ports 112 formed at both ends of the base plate 110. The water-cooled flow channel 111 is connected to the flow channel ports 112, and a water-cooled sealing strip 120, made of rubber, is provided within the flow channel ports 112. Figure 4 As shown, the water-cooled sealing strip 120 has inclined surfaces 121 on both the upper and lower sides. A buffer cavity 122 is formed between the inclined surface 121 and the flow channel port 112, serving as a buffer space for the thermal expansion of the condensate. When the condensate temperature rises, its volume expands proportionally. If a welded square sealing strip is used, the water-cooling structure is completely sealed without any reserved space. The expanding condensate will be squeezed, generating instantaneous pressure. This pressure will directly act on the end face of the square sealing strip. Repeated impacts can easily cause the square sealing strip to loosen and the seal to fail. When the temperature rises, the condensate volume increases and naturally fills the buffer cavity 122 without generating significant squeezing pressure. When the temperature drops, the condensate volume shrinks, forming a small negative pressure within the buffer cavity 122. The elasticity and pre-tightening force of the water-cooled sealing strip 120 can counteract this, preventing the water-cooled sealing strip 120 from loosening. Figure 6 As shown, the water-cooled sealing strip 120 has a buffer cavity 126 inside, and a spring 127 is radially arranged inside the buffer cavity 126. The spring 127 continuously provides radial preload to both ends of the water-cooled sealing strip 120. During assembly, the water-cooled sealing strip 120 is squeezed, and the internal spring 127 is also compressed, storing elastic potential energy. When the rubber loses elasticity due to aging, the spring 127 will release the stored potential energy and push both ends of the water-cooled sealing strip 120 to maintain deformation through the rebound force, offsetting the loss of the rubber's own elasticity and ensuring that the rubber plug always applies sufficient radial pressure to the inner wall of the channel to maintain the sealing effect of the water-cooled sealing strip 120.

[0041] like Figure 5 As shown, grooves 123 are provided on both the upper and lower sides of the water-cooled sealing strip 120. A buffer cavity 124 is formed between the grooves 123 and the flow channel port 112. The buffer cavity 124 forms a closed space. The air inside is compressible. When the water-cooled sealing strip 120 is impacted, the air inside the cavity will be squeezed and contracted. During the compression process, the gas will absorb the impact energy, preventing the impact force from being directly transmitted to the contact surface between the rubber strip and the channel. This reduces the instantaneous impact stress generated by the expansion of condensate or vibration of the vehicle body. Anti-slip strips 125 are provided on both the upper and lower sides of the water-cooled sealing strip 120. After assembly, the oblique texture on the surface of the water-cooled sealing strip 120 forms a fit with the inner wall of the channel. When the rubber plug has an axial movement tendency, it is hindered from moving. At the same time, the oblique texture can also increase the roughness of the contact surface, further improve the friction, and improve the stability of the water-cooled sealing strip 120.

[0042] like Figure 10 As shown, a water inlet 113 is fixedly connected to one side of the base plate 110, and a water outlet 114 is fixedly connected to the side of the base plate 110 away from the water inlet 113. Both the water inlet 113 and the water outlet 114 are connected to the water cooling channel 111.

[0043] Furthermore, in the existing battery pack box frame assembly, after the profiles of each part are processed, the base plate 110 is first connected to the frame by friction stir welding. Then, the two sides of the water-cooling structure are sealed by arc welding. Then, the wire harness bracket 131 is fixed by laser welding or arc welding. The conventional assembly method for the wire harness bracket 131 is arc welding or laser welding. Both of these fixing methods have the risk of air leakage. The more wire harness brackets 131 there are, the more welding points there are, and the greater the risk of air leakage. Finally, the front and rear panels are spliced ​​by arc welding. The entire box assembly process uses a lot of fusion welding, which results in longer working time and greater product deformation. Not only is the stability poor, but the production efficiency is also low, which affects the yield of the battery pack box frame assembly.

[0044] During the assembly process, the water-cooled sealing strip 120 is directly inserted into the flow channel port 112. Compared with the traditional square sealing strip, there is no need to use laser to pre-fix the square sealing strip, thereby improving production efficiency. Then, the wire harness bracket 131 is fixed to the transition connecting plate 130 using laser welding or arc welding. Subsequently, the transition connecting plate 130 is connected and fixed to the base plate 110 using an adhesive coating process, transferring the welding points of the wire harness bracket 131 and the base plate 110 to the transition connecting plate 130, reducing multiple welding points and increasing the yield rate. At the same time, welding the wire harness bracket 131 separately to the transition connecting plate 130 also improves the convenience of welding. The central crossbeam 220 and the side crossbeam 230 are stressed by the bottom structural adhesive, while the mounting groove 1 211 and mounting groove 221 are stressed. After welding, rivets 241 and screws are used to increase strength. Using adhesive coating instead of welding reduces the amount of welding, thereby reducing the overall welding deformation and water-cooled leakage quality risk.

[0045] like Figure 2 As shown, the crossbeam connecting assembly 200 includes two side frames 210 symmetrically fixedly connected to both sides of the water-cooled connecting assembly 100. The two side frames 210 are connected to the base plate 110 by friction welding. A central crossbeam 220 is provided in the middle between the two side frames 210. Two side crossbeams 230 are symmetrically provided on both sides between the two side frames 210. The bottom of the central crossbeam 220 and the side crossbeams 230 are coated with structural adhesive. The connection between the structural adhesive and the base plate 110 forms the bottom of the central crossbeam 220 and the side crossbeams 230 to bear the force.

[0046] like Figure 10 As shown, a front panel 140 is fixedly connected to one end of the base plate 110. The front panel 140 has a discharge connection hole 141, a communication connection hole 142 and a charging connection hole 143. A rear panel 150 is fixedly connected to the side of the base plate 110 away from the front panel 140. An explosion-proof valve mounting hole 151 is provided on the rear panel 150.

[0047] like Figure 9As shown, a transition connecting plate 130 is provided on the top of the base plate 110. Multiple wire harness brackets 131 are fixedly connected to the transition connecting plate 130. The bottom of the transition connecting plate 130 is coated with structural adhesive. After the wire harness brackets 131 are welded to the transition connecting plate 130, the transition connecting plate 130 is fixed to the base plate 110 by the structural adhesive.

[0048] like Figure 7 and Figure 8 As shown, each of the two side frames 210 has three mounting slots 1 211, and each of the central crossbeam 220 and the side crossbeam 230 has a mounting slot 221. The mounting slots 1 211 and 221 are slidably connected, and the mounting slots 1 211 and 221 form a snap-fit ​​engagement. During assembly, the mounting slots 221 are aligned with the mounting slots 1 211 and inserted to achieve pre-fixation of the central crossbeam 220 and the side crossbeam 230, facilitating subsequent arc welding of the central crossbeam 220 and the side frames 210. Both ends of the central crossbeam 220 and the side crossbeam 230 are provided with connecting panels 240, and rivets 241 are provided on the connecting panels 240. The connecting panels 240 are internally threaded with mounting bolts 242, and one end of the rivet 241 passes through the connecting panel 240 and connects to the central crossbeam 220 and the side crossbeam 230. The mounting bolt 242 passes through one end of the connecting panel 240 and connects to the side frame 210. Under the stress of the structural adhesive at the bottom of the central beam 220 and the side beam 230, and the stress of the side mounting groove 1 211 and mounting groove 221, as well as the arc weld, compared with the side welding method, the sides and bottom of the central beam 220 and the side beam 230 are simultaneously stressed, and no additional welds are added, which improves the strength of the battery pack box frame. After welding, the rivets 241 and mounting bolts 242 are installed. The rivets 241 connect the connecting panel 240 to the central beam 220 and the side beam 230, and the mounting bolts 242 connect the connecting panel 240 to the side frame 210. After the central beam 220 and the side beam 230 are welded to the side frame 210, the top of the weld is stressed, which further improves the overall strength of the battery pack box frame.

[0049] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A connection structure for the frame of a battery pack housing for a new energy vehicle, characterized in that, Including: A water-cooled connection assembly (100) includes a base plate (110), both ends of which are provided with flow channel ports (112). A water-cooled sealing strip (120) is provided in the flow channel ports (112). Inclined surfaces (121) are provided on both the upper and lower sides of the water-cooled sealing strip (120). A buffer cavity (122) is formed between the inclined surfaces (121) and the flow channel ports (112) as a buffer space when the condensate expands thermally. A buffer cavity (126) is provided inside the water-cooled sealing strip (120). A spring (127) is radially provided inside the buffer cavity (126). The spring (127) continuously provides radial preload force to both ends of the water-cooled sealing strip (120). A crossbeam connecting assembly (200) includes side frames (210) symmetrically arranged on both sides of a water-cooled connecting assembly (100), a central crossbeam (220) is arranged between the two side frames (210), and two side crossbeams (230) are symmetrically arranged on both sides between the two side frames (210). The bottom of the central crossbeam (220) and the side crossbeams (230) are coated with structural adhesive, and the connection between the structural adhesive and the base plate (110) forms the bottom force of the central crossbeam (220) and the side crossbeams (230).

2. The connection structure of the battery pack housing frame of a new energy vehicle according to claim 1, characterized in that, A water-cooled flow channel (111) is provided in the base plate (110), and the water-cooled flow channel (111) is connected to the flow channel port (112).

3. The connection structure of the battery pack housing frame of a new energy vehicle according to claim 2, characterized in that, The water-cooled sealing strip (120) has grooves (123) on both the upper and lower sides, and a buffer cavity (124) is formed between the grooves (123) and the flow channel port (112). Anti-slip stripes (125) are provided on both the upper and lower sides of the water-cooled sealing strip (120).

4. The connection structure of the battery pack housing frame of a new energy vehicle according to claim 3, characterized in that, One end of the base plate (110) is fixedly connected to a front panel (140), and the front panel (140) is provided with a discharge connection hole (141), a communication connection hole (142) and a charging connection hole (143).

5. The connection structure of the battery pack housing frame of a new energy vehicle according to claim 4, characterized in that, A rear panel (150) is fixedly connected to the side of the base plate (110) away from the front panel (140), and an explosion-proof valve mounting hole (151) is provided on the rear panel (150).

6. The connection structure of the battery pack housing frame of a new energy vehicle according to claim 5, characterized in that, The top of the base plate (110) is provided with a transition connecting plate (130), and multiple wire harness brackets (131) are fixedly connected to the transition connecting plate (130). The bottom of the transition connecting plate (130) is coated with structural adhesive.

7. The connection structure of the battery pack housing frame of a new energy vehicle according to claim 1, characterized in that, Three mounting slots (211) are provided on both side frames (210), and mounting slots (221) are provided on both the central crossbeam (220) and the side crossbeam (230). The mounting slots (211) and the mounting slots (221) are slidably connected.

8. The connection structure of the battery pack housing frame of a new energy vehicle according to claim 7, characterized in that, Both ends of the central crossbeam (220) and the side crossbeam (230) are provided with connecting panels (240), and rivets (241) are provided on the connecting panels (240). The connecting panels (240) are internally threaded with mounting bolts (242).

9. The connection structure of the battery pack housing frame of a new energy vehicle according to claim 8, characterized in that, The rivet (241) passes through one end of the connecting panel (240) and is riveted to the middle crossbeam (220) and the side crossbeam (230), and the mounting bolt (242) passes through one end of the connecting panel (240) and is threaded to the side frame (210).

10. The connection structure of the battery pack housing frame of a new energy vehicle according to claim 1, characterized in that, A water inlet (113) is fixedly connected to one side of the base plate (110), and a water outlet (114) is fixedly connected to the side of the base plate (110) away from the water inlet (113). Both the water inlet (113) and the water outlet (114) are connected to the water cooling channel (111).

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