Plug, liquid cooling plate and battery box

Abstract

The present invention relates to a plug, a liquid cooling plate and a battery box. The rear end of the plug is used to plug one end of a flow channel plate. The plug extends in the left-right direction and is consistent with the width direction of the flow channel plate. The rear end of the plug is provided with a liquid distribution cavity for communicating with the flow channel in the flow channel plate. The plug is provided with an interface for supplying coolant to enter or flow out of the liquid cooling plate and communicating with the liquid distribution cavity. A liquid distribution groove is provided on the lower surface of the plug. The plug is provided with a channel connecting the liquid distribution groove and the interface. The liquid distribution groove has a downward lower opening, a rear notch communicating with the liquid distribution cavity, and two side groove walls distributed on the left and right. The plug also includes a cover plate for sealing the lower opening of the liquid distribution groove; the liquid distribution groove has a constriction section in front of the rear notch, and the spacing between the two side groove walls of the constriction section in the left-right direction decreases from back to front. The constriction section can buffer the coolant, reduce the impact of the coolant on the channel and the liquid distribution cavity, and extend the service life of the plug.

Description

Technical Field

[0001] The invention belongs to the field of battery boxes, and in particular relates to a plug, a liquid cooling plate and a battery box. Background Art

[0002] As national policies continue to increase the energy density of battery systems, the lithium iron phosphate batteries used in most commercial vehicles also need to continuously improve their energy density. In the absence of major technological breakthroughs, the current common practice is to make the battery cells larger. However, due to the increase in the size of the battery cells, the unit heat dissipation area is reduced, and the heat in the center of the battery cell cannot be quickly transferred out, causing the heat dissipation performance of the battery cell to deteriorate, affecting the performance of the product. Therefore, it is necessary to equip the large-cell lithium iron phosphate battery with a liquid cooling plate to cool the battery.

[0003] The liquid cooling plate usually includes a flow channel plate, in which a flow channel for circulating the coolant is provided. The flow channel extends in a direction parallel to the plate surface of the flow channel plate, passes through the end surfaces at both ends of the flow channel plate and forms openings on the end surfaces. In order to ensure the sealing of the flow channel and facilitate the coolant to enter or flow out of the liquid cooling plate, it is necessary to provide plugs at both ends of the flow channel plate to seal the flow channel openings, and to provide a liquid distribution cavity connected to the flow channel in the flow channel plate and an interface for the coolant to enter or flow out of the liquid cooling plate on the plug.

[0004] For example, a Chinese utility model patent with an authorization announcement date of 2017.02.15 and an authorization announcement number of "CN205961664U" discloses "an extruded water-cooled plate", including a water-cooled body and a water distribution plate. The water-cooled plate is equivalent to a liquid cooling plate, and the water-cooled body is equivalent to a flow channel plate. The water distribution plate directly constitutes a plug for sealing one end of the flow channel plate. The plug extends in the left-right direction and is consistent with the width direction of the flow channel plate. Water distribution chambers, i.e., liquid distribution chambers, are provided at both ends of the plug. The liquid distribution chambers are arranged toward the combined flow channel openings at both ends of the flow channel plate. Two water inlet and outlet holes, i.e., interfaces, are provided on the upper surface of the plug above the liquid distribution chamber. A channel extending in a direction perpendicular to the plate surface of the liquid cooling plate is provided between the interface and the water distribution chamber for connecting the two. The aperture of the channel is consistent with the aperture of the interface. Inlet and outlet water joints are fixedly provided on the two interfaces by argon arc welding, and the extension direction of the inlet and outlet water joints is perpendicular to the upper plate surface of the liquid cooling plate.

[0005] The problem with the above plug is that the liquid distribution cavity is a square cavity set in the plug. In order to facilitate the coolant in the flow channel plate to enter or flow out of the liquid distribution cavity, the width of the liquid distribution cavity in the left and right directions is usually set larger, while the aperture of the interface is adapted to the diameter of the inlet and outlet water joints and is usually set smaller. Therefore, the aperture of the channel is also set smaller. When the coolant enters the channel from the liquid distribution cavity, the flow space of the coolant is suddenly reduced, which is easy to generate a large impact on the channel. On the contrary, when the coolant enters the liquid distribution cavity from the channel, the flow space of the coolant is suddenly increased, which is easy to generate a large impact on the liquid distribution cavity. Therefore, the service life of the above plug is short. And if the plug is damaged by impact force, it will cause leakage of coolant, which may damage the batteries in the battery box equipped with liquid cooling plate. Summary of the invention

[0006] The purpose of the present invention is to provide a plug to solve the technical problem in the prior art that the plug has a short service life due to the large impact force on the plug when the coolant inside the plug circulates. The purpose of the present invention is also to provide a liquid cooling plate using the above plug to reduce the occurrence of liquid cooling plate leakage due to plug damage. The purpose of the present invention is also to provide a battery box using the above liquid cooling plate to reduce the risk of battery box damage due to liquid cooling plate leakage.

[0007] In order to solve the above technical problems, the technical solution of the plug of the present invention is:

[0008] A plug, the rear end of the plug is used to seal one end of the flow channel plate, the plug extends in the left-right direction and is consistent with the width direction of the flow channel plate, the rear end of the plug is provided with a liquid distribution cavity for communicating with the flow channel in the flow channel plate, and the plug is also provided with an interface for supplying coolant to enter or flow out of the liquid cooling plate and communicating with the liquid distribution cavity, a liquid distribution groove is provided on the lower surface of the plug, and the plug is also provided with a channel connecting the liquid distribution groove and the interface, the liquid distribution groove has a downward lower opening, a rear notch connected to the liquid distribution cavity, and two side groove walls distributed on the left and right, and the plug also includes a cover plate for sealing the lower opening of the liquid distribution groove; the liquid distribution groove has a necking section in front of the rear notch, and the spacing between the two side groove walls of the necking section in the left-right direction decreases from back to front.

[0009] Beneficial effect: the rear notch of the liquid dispensing groove is used to communicate with the liquid dispensing cavity, and the channel is used to connect the liquid dispensing groove and the interface. Therefore, the constricted section of the liquid dispensing groove can buffer the coolant, reduce the impact of the coolant on the liquid dispensing cavity and the channel, and the impact of the coolant on the groove wall of the liquid dispensing groove, and extend the service life of the plug.

[0010] Furthermore, the constricted section of the liquid distribution groove gradually extends forward from the rear groove opening, and the liquid distribution groove also includes an equal-width section connected to the front of the constricted section, and the spacing between the groove walls on both sides of the equal-width section in the left-right direction remains unchanged from back to front.

[0011] Beneficial effects: The necking section is used to buffer the coolant, and the equal-width section is used to stabilize the flow rate of the coolant, so that the coolant buffered by the necking section is stabilized and then flows into the channel, or the coolant flowing out of the channel is stabilized by the equal-width section and then flows into the liquid distribution cavity, further reducing the impact of the coolant on the inside of the plug.

[0012] Furthermore, the spacing between the two side walls of the rear notch is adapted to the width of the liquid distribution cavity in the left-right direction, and the width of the liquid distribution cavity in the left-right direction is adapted to the width of a row of unidirectional flow channel groups on the flow channel plate.

[0013] Beneficial effect: When the coolant flows through the connection between the flow channel plate and the plug, and when the coolant flows through the rear notch, the width of the flow space of the coolant remains unchanged, reducing the impact of the coolant on the connection between the plug and the flow channel plate and reducing the impact of the coolant on the rear notch.

[0014] Furthermore, the interface is arranged on the surface of the plug located in front of the liquid distribution chamber, one end of the channel connected to the liquid distribution tank is connected to the interface and the channel extends backward and / or downward from the interface position, and the other end is connected to the connecting port arranged on the tank wall of the liquid distribution tank and located in front of the rear slot.

[0015] The technical solution of the liquid cooling plate of the present invention is:

[0016] The liquid cooling plate comprises a flow channel plate and a plug, wherein the rear end of the plug is used to seal one end of the flow channel plate, the plug extends in the left-right direction and is consistent with the width direction of the flow channel plate, the rear end of the plug is provided with a liquid distribution cavity for communicating with the flow channel in the flow channel plate, the plug is also provided with an interface for supplying coolant into or out of the liquid cooling plate and communicating with the liquid distribution cavity, a liquid distribution groove is provided on the lower surface of the plug, and the plug is also provided with a channel connecting the liquid distribution groove and the interface, the liquid distribution groove has a downward lower opening, a rear notch communicating with the liquid distribution cavity, and two side groove walls distributed on the left and right, the plug also includes a cover plate for sealing the lower opening of the liquid distribution groove; the liquid distribution groove has a shrinking section in front of the rear notch, and the spacing between the two side groove walls of the shrinking section in the left-right direction decreases from back to front.

[0017] Beneficial effect: the rear notch of the liquid dispensing groove is used to communicate with the liquid dispensing cavity, and the channel is used to connect the liquid dispensing groove and the interface. Therefore, the constricted section of the liquid dispensing groove can buffer the coolant, reduce the impact of the coolant on the liquid dispensing cavity and the channel, and the impact of the coolant on the groove wall of the liquid dispensing groove, and extend the service life of the plug.

[0018] Furthermore, the constricted section of the liquid distribution groove gradually extends forward from the rear groove opening, and the liquid distribution groove also includes an equal-width section connected to the front of the constricted section, and the spacing between the groove walls on both sides of the equal-width section in the left-right direction remains unchanged from back to front.

[0019] Beneficial effects: The necking section is used to buffer the coolant, and the equal-width section is used to stabilize the flow rate of the coolant, so that the coolant buffered by the necking section is stabilized and then flows into the channel, or the coolant flowing out of the channel is stabilized by the equal-width section and then flows into the liquid distribution cavity, further reducing the impact of the coolant on the inside of the plug.

[0020] Furthermore, a plurality of rows of unidirectional flow channel groups are provided in the flow channel plate, each row of unidirectional flow channel groups includes a plurality of flow channels which are adjacent to each other and have the same coolant flow direction, the spacing between the groove walls on both sides of the rear notch is adapted to the width dimension of the liquid distribution chamber in the left-right direction, and the width dimension of the liquid distribution chamber in the left-right direction is adapted to the width of a row of unidirectional flow channel groups on the flow channel plate.

[0021] Beneficial effect: When the coolant flows through the connection between the flow channel plate and the plug, and when the coolant flows through the rear notch, the width of the flow space of the coolant remains unchanged, reducing the impact of the coolant on the connection between the plug and the flow channel plate and reducing the impact of the coolant on the rear notch.

[0022] Furthermore, the interface is arranged on the surface of the plug located in front of the liquid distribution chamber, one end of the channel connected to the liquid distribution tank is connected to the interface and the channel extends backward and / or downward from the interface position, and the other end is connected to the connecting port arranged on the tank wall of the liquid distribution tank and located in front of the rear slot.

[0023] The technical solution of the battery box of the present invention is:

[0024] The battery box comprises a liquid cooling plate, which comprises a flow channel plate and a plug. The rear end of the plug is used to seal one end of the flow channel plate. The plug extends in the left-right direction and is consistent with the width direction of the flow channel plate. A liquid distribution cavity communicating with the flow channel in the flow channel plate is provided at the rear end of the plug. The plug is also provided with an interface communicating with the liquid distribution cavity for supplying coolant to enter or flow out of the liquid cooling plate. A liquid distribution groove is provided on the lower surface of the plug. The plug is also provided with a channel connecting the liquid distribution groove and the interface. The liquid distribution groove has a downward lower opening, a rear notch communicating with the liquid distribution cavity, and two side groove walls distributed on the left and right. The plug also includes a cover plate for sealing the lower opening of the liquid distribution groove. The liquid distribution groove has a necking section in front of the rear notch, and the spacing between the two side groove walls of the necking section in the left-right direction decreases from back to front.

[0025] Beneficial effect: the rear notch of the liquid dispensing groove is used to communicate with the liquid dispensing cavity, and the channel is used to connect the liquid dispensing groove and the interface. Therefore, the constricted section of the liquid dispensing groove can buffer the coolant, reduce the impact of the coolant on the liquid dispensing cavity and the channel, and the impact of the coolant on the groove wall of the liquid dispensing groove, and extend the service life of the plug.

[0026] Furthermore, the constricted section of the liquid distribution groove gradually extends forward from the rear groove opening, and the liquid distribution groove also includes an equal-width section connected to the front of the constricted section, and the spacing between the groove walls on both sides of the equal-width section in the left-right direction remains unchanged from back to front.

[0027] Beneficial effects: The necking section is used to buffer the coolant, and the equal-width section is used to stabilize the flow rate of the coolant, so that the coolant buffered by the necking section is stabilized and then flows into the channel, or the coolant flowing out of the channel is stabilized by the equal-width section and then flows into the liquid distribution cavity, further reducing the impact of the coolant on the inside of the plug.

[0028] Furthermore, a plurality of rows of unidirectional flow channel groups are provided in the flow channel plate, each row of unidirectional flow channel groups includes a plurality of flow channels which are adjacent to each other and have the same coolant flow direction, the spacing between the groove walls on both sides of the rear notch is adapted to the width dimension of the liquid distribution chamber in the left-right direction, and the width dimension of the liquid distribution chamber in the left-right direction is adapted to the width of a row of unidirectional flow channel groups on the flow channel plate.

[0029] Beneficial effect: When the coolant flows through the connection between the flow channel plate and the plug, and when the coolant flows through the rear notch, the width of the flow space of the coolant remains unchanged, reducing the impact of the coolant on the connection between the plug and the flow channel plate and reducing the impact of the coolant on the rear notch.

[0030] Furthermore, the interface is arranged on the surface of the plug located in front of the liquid distribution chamber, one end of the channel connected to the liquid distribution tank is connected to the interface and the channel extends backward and / or downward from the interface position, and the other end is connected to the connecting port arranged on the tank wall of the liquid distribution tank and located in front of the rear slot. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a three-dimensional schematic diagram of a liquid cooling plate of a specific embodiment 1 of the present invention when installed in a battery box from a first viewing angle;

[0032] Figure 2 is a perspective schematic diagram of a liquid cooling plate of a first specific embodiment of the present invention when installed in a battery box from a second viewing angle;

[0033] Figure 3 yes Figure 1 A first-person perspective stereoscopic diagram of the plug in FIG.

[0034] Figure 4 yes Figure 3A stereoscopic schematic diagram of a second perspective of the plug in FIG.

[0035] Figure 5 yes Figure 1 A schematic diagram of the structure of the flow channel plate;

[0036] Figure 6 yes Figure 5 AA cross-sectional view of the liquid cooling plate in FIG.

[0037] Figure 7 yes Figure 1 A schematic diagram of the structure of the plug in FIG.

[0038] Figure 8 yes Figure 7 CC section view of the plug in;

[0039] Fig. 9 yes Figure 7 BB cross-sectional view of the plug in FIG.

[0040] In the figure: 1. flow channel plate; 2. plug; 3. liquid distribution plate; 4. adapter; 5. L-shaped channel; 6. horizontal channel; 7. vertical channel; 8. interface; 9. liquid distribution chamber; 10. liquid distribution tank; 11. water pipe joint; 12. same-direction flow channel group; 13. flow channel; 14. rear notch; 15. necking section; 16. equal-width section; 17. box side panel; 18. plug; 19. socket; 20. tongue; 21. mounting groove; 22. battery module mounting beam; 23. battery module mounting hole; 24. overhang; 25. cover plate. DETAILED DESCRIPTION

[0041] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0042] A specific embodiment 1 of the liquid cooling plate of the present invention is as follows Figure 1 , Figure 2 As shown, the liquid cooling plate includes a flow channel plate 1 and a plug 2. Figure 6 As shown, the flow channel plate 1 is a rectangular plate body, and a plurality of rows of unidirectional flow channel groups 12 are arranged in the flow channel plate 1. Each row of unidirectional flow channel groups 12 includes a plurality of flow channels 13 which are adjacent to each other and have the same coolant flow direction. Figure 6 The arrow on the flow channel plate 1 in the figure indicates the flow direction of the coolant. Figure 5 As shown, a socket 19 is provided at the front end of the flow channel plate 1. The socket 19 includes a U-shaped mounting groove 21 with a notch facing forward.

[0043] like Figure 3 As shown, the plug 2 includes a liquid distribution plate 3 and a transfer platform 4 integrally convexly provided on the upper plate surface of the liquid distribution plate 3. The two transfer platforms 4 are arranged at intervals along the left-right direction. The rear end of the liquid distribution plate 3 is used to seal the front end of the flow channel plate 1. The liquid distribution plate 3 extends along the left-right direction and is consistent with the width direction of the flow channel plate 1. Figure 3 , 4 As shown, the rear end of the liquid distribution plate 3 is provided with a liquid distribution cavity 9 for communicating with the flow channel 13 in the flow channel plate 1. There are two liquid distribution cavities 9, which are used for water inlet and water outlet respectively, and the two liquid distribution cavities 9 are respectively located at the left and right ends of the liquid distribution plate 3.

[0044] like Figure 8 As shown, an L-shaped channel 5 is provided in the adapter 4, and the L-shaped channel includes a transverse channel 6 and a vertical channel 7. The transverse channel 6 extends forward from the corner of the L-shaped channel 5 to pass through the front end surface of the adapter 4, and an interface 8 is opened on the front end surface of the adapter 4. The interface 8 is used for cooling liquid to enter or flow out of the liquid cooling plate. The vertical channel 7 extends downward from the corner of the L-shaped channel 5; in this embodiment, the interface 8 is connected to a water pipe joint 11 installed on the side panel 17 of the battery box body in the same extension direction as the transverse channel 6. There are two water pipe joints 11, one for cooling liquid to enter the liquid cooling plate, and the other for cooling liquid to flow out of the liquid cooling plate. An opening structure is provided on the lower surface of the plug 2. In the present embodiment, the opening structure is a liquid dispensing groove 10 extending from front to rear and provided on the lower surface of the liquid dispensing plate 3. The liquid dispensing groove 10 has a downwardly facing lower opening, a rear notch 14 connected to the liquid dispensing chamber 9, and two side groove walls distributed on the left and right. The lower end of the vertical channel 7 is integrally connected to the liquid dispensing groove 10 to form an open hole. The open hole is a process hole left after the processing tool processes the vertical channel from bottom to top. After the processing is completed, the cover plate 25 is used to seal the lower opening of the liquid dispensing groove 10.

[0045] like Figure 4 , 9 As shown, the liquid distribution groove 10 has a constricted section 15 located in front of the rear notch 14, and the spacing between the groove walls on both sides of the constricted section 15 in the left-right direction decreases from the back to the front. The liquid distribution groove 10 also includes an equal-width section 16 connected to the front of the constricted section 15, and the spacing between the groove walls on both sides of the equal-width section 16 in the left-right direction remains unchanged from the back to the front. In this embodiment, the spacing between the groove walls on both sides of the rear notch 14 is adapted to the width dimension of the liquid distribution cavity 9 in the left-right direction, and the width dimension of the liquid distribution cavity 9 in the left-right direction is adapted to the width of a row of unidirectional flow channel groups 12 on the flow channel plate 1, so as to facilitate the coolant to enter or flow out of the unidirectional flow channel group 12.

[0046] The transfer station 4 includes an overhanging portion 24 disposed at the front for passing through the mounting hole on the side plate 17 of the battery box, and the outer periphery of the overhanging portion 24 is provided with a positioning step facing forward for engaging with the inner surface of the side plate 17 of the box, such as Figure 3 As shown, the rear end of the liquid distribution plate 3 is provided with a plug 18, and the plug is provided with a tongue 20. When in use, the tongue 20 is inserted into the mounting groove 21 of the socket 19. Figure 3 , 7As shown in FIG. 8 , a battery module mounting beam 22 for mounting a battery module is provided on the upper plate surface of the liquid distribution plate 3 at the rear of the transfer platform 4 , and a plurality of battery module mounting holes 23 are provided on the upper end surface of the battery module mounting beam 22 .

[0047] In the present invention, the liquid distribution groove 10 connects the L-shaped channel 5 and the liquid distribution cavity 9, so the constricted section 15 of the liquid distribution groove 10 can buffer the coolant, reduce the impact of the coolant on the liquid distribution cavity 9 and the L-shaped channel 5, and the impact of the coolant on the groove wall of the liquid distribution groove 10, and extend the service life of the plug 2.

[0048] The specific embodiment 2 of the liquid cooling plate of the present invention is different from the specific embodiment 1 in that no adapter is protruding from the plug, and the plug is directly composed of a liquid distribution plate, in which a liquid distribution cavity, a liquid distribution trough and an L-shaped channel are provided. In this embodiment, since the L-shaped channel is arranged in the liquid distribution plate, the thickness of the liquid distribution plate is relatively thick.

[0049] The specific embodiment 3 of the liquid cooling plate of the present invention differs from the specific embodiment 1 in that the opening structure is a through hole extending from the lower surface of the plug upward to the vertical channel, and the hole wall on the radial side of the through hole is provided with a connecting hole connected to the liquid distribution chamber, and the cover plate is used to seal the lower opening of the cover through hole.

[0050] The specific embodiment 4 of the liquid cooling plate of the present invention is different from the specific embodiment 1 in that plugs are provided at both ends of the flow channel plate, and adapters for water inlet and outlet are respectively provided on the two plugs.

[0051] The specific embodiment 5 of the liquid cooling plate of the present invention is different from the embodiment 1 in that the channel used to connect the liquid distribution tank and the interface in the embodiment 1 is an L-shaped channel, and the L-shaped channel extends backward and downward. In this embodiment, the channel connecting the liquid distribution tank and the interface is only a vertical channel, and the vertical channel extends from bottom to top through the upper surface of the plug, and an interface is opened on the upper surface of the plug.

[0052] The specific embodiment 1 of the plug of the present invention has the same structure as the plug in the above-mentioned embodiment 1 of the liquid cooling plate, and will not be described in detail here.

[0053] The specific embodiment 2 of the plug of the present invention has the same structure as the plug in the above-mentioned embodiment 2 of the liquid cooling plate, and will not be described in detail here.

[0054] The specific embodiment 3 of the plug of the present invention has the same structure as the plug in the above-mentioned embodiment 3 of the liquid cooling plate, and will not be described in detail here.

[0055] The specific embodiment 4 of the plug of the present invention has the same structure as the plug in the above-mentioned embodiment 4 of the liquid cooling plate, which will not be described in detail here.

[0056] The specific embodiment 5 of the plug of the present invention has the same structure as the plug in the above-mentioned embodiment 5 of the liquid cooling plate, which will not be described in detail here.

[0057] In the first specific embodiment of the battery box of the present invention, a liquid cooling plate is provided in the box. Figure 1 , Figure 2 , as well as the introduction of the installation structure of the interface 8, the water pipe joint 11 and the box side plate 17 in the above-mentioned liquid cooling plate implementation, the liquid cooling plate directly constitutes the bottom plate of the battery box, and the method of arranging the liquid cooling plate in the battery box belongs to the prior art. Of course, it can also be installed in a battery box with a box bottom and is not limited to constituting the bottom plate of the battery box. The structure of the liquid cooling plate is the same as the structure of the liquid cooling plate in the above-mentioned liquid cooling plate embodiment 1, and will not be repeated here.

[0058] In the second specific embodiment of the battery box of the present invention, a liquid cooling plate is provided in the box. The structure of the liquid cooling plate is the same as that of the liquid cooling plate in the second specific embodiment of the liquid cooling plate, and will not be described in detail here.

[0059] In the specific embodiment 3 of the battery box of the present invention, a liquid cooling plate is provided in the box. The structure of the liquid cooling plate is the same as that of the liquid cooling plate in the above-mentioned liquid cooling plate embodiment 3, and will not be described in detail here.

[0060] In a fourth specific embodiment of the battery box of the present invention, a liquid cooling plate is provided in the box. The structure of the liquid cooling plate is the same as that of the liquid cooling plate in the fourth specific embodiment of the liquid cooling plate, and will not be described in detail here.

[0061] In a fifth specific embodiment of the battery box of the present invention, a liquid cooling plate is provided in the box. The structure of the liquid cooling plate is the same as that of the liquid cooling plate in the fifth specific embodiment of the liquid cooling plate, and will not be described in detail here.

Claims

1. A plug, the rear end of which is used to seal one end of the flow channel plate. The plug extends in the left-right direction and is consistent with the width direction of the flow channel plate. A liquid distribution cavity communicating with the flow channel in the flow channel plate is provided at the rear end of the plug. The plug is also provided with an interface communicating with the liquid distribution cavity for the coolant to enter or flow out of the liquid cooling plate. The characteristics are as follows: A liquid distribution groove is provided on the lower surface of the plug, and a channel connecting the liquid distribution groove and the interface is also provided in the plug, the liquid distribution groove has a downward lower opening, a rear notch connected to the liquid distribution cavity, and two side groove walls distributed on the left and right, and the plug also includes a cover plate for sealing the lower opening of the liquid distribution groove; the liquid distribution groove has a constricted section located in front of the rear notch, and the spacing between the two side groove walls of the constricted section in the left and right directions decreases from back to front, and an L-shaped channel is also provided in the plug, the L-shaped channel includes a transverse channel and a vertical channel, the transverse channel extends forward from the corner of the L-shaped channel to pass through the front end surface of the plug, and the interface is provided on the front end surface of the plug, and the vertical channel extends downward from the corner of the L-shaped channel; an opening structure is provided on the lower surface of the plug, and the opening structure has a downward lower opening; the lower end of the vertical channel is integrally connected with the opening structure to form an open hole, one side of the opening structure is connected with the liquid distribution cavity, and the vertical channel is connected with the liquid distribution cavity through the opening structure.

2. The plug according to claim 1, characterized in that: The constricted section of the liquid distribution groove gradually extends forward from the rear notch, and the liquid distribution groove also includes an equal-width section connected to the front of the constricted section, and the spacing between the groove walls on both sides of the equal-width section in the left-right direction remains unchanged from back to front.

3. The plug according to claim 1 or 2, characterized in that: The spacing between the groove walls on both sides of the rear groove is matched with the width of the liquid distribution cavity in the left-right direction, and the width of the liquid distribution cavity in the left-right direction is used to match the width of a row of unidirectional flow channel groups on the flow channel plate.

4. The plug according to claim 1 or 2, characterized in that: The interface is arranged on the surface of the plug located in front of the liquid distribution chamber, one end of the channel connected to the liquid distribution tank is connected to the interface and the channel extends backward and / or downward from the interface position, and the other end is connected to the connecting port located in front of the rear slot provided on the tank wall of the liquid distribution tank.

5. A liquid cooling plate, comprising a flow channel plate and a plug, wherein the rear end of the plug is used to seal one end of the flow channel plate, the plug extends in the left-right direction and is consistent with the width direction of the flow channel plate, the rear end of the plug is provided with a liquid distribution cavity for communicating with the flow channel in the flow channel plate, and the plug is also provided with an interface for supplying coolant into or out of the liquid cooling plate in communication with the liquid distribution cavity, characterized in that: A liquid distribution groove is provided on the lower surface of the plug, and a channel connecting the liquid distribution groove and the interface is also provided in the plug, the liquid distribution groove has a downward lower opening, a rear notch connected to the liquid distribution cavity, and two side groove walls distributed on the left and right, and the plug also includes a cover plate for sealing the lower opening of the liquid distribution groove; the liquid distribution groove has a constricted section located in front of the rear notch, and the spacing between the two side groove walls of the constricted section in the left and right directions decreases from back to front, and an L-shaped channel is also provided in the plug, the L-shaped channel includes a transverse channel and a vertical channel, the transverse channel extends forward from the corner of the L-shaped channel to pass through the front end surface of the plug, and the interface is provided on the front end surface of the plug, and the vertical channel extends downward from the corner of the L-shaped channel; an opening structure is provided on the lower surface of the plug, and the opening structure has a downward lower opening; the lower end of the vertical channel is integrally connected with the opening structure to form an open hole, one side of the opening structure is connected with the liquid distribution cavity, and the vertical channel is connected with the liquid distribution cavity through the opening structure.

6. The liquid cooling plate according to claim 5, characterized in that: The constricted section of the liquid distribution groove gradually extends forward from the rear notch, and the liquid distribution groove also includes an equal-width section connected to the front of the constricted section, and the spacing between the groove walls on both sides of the equal-width section in the left-right direction remains unchanged from back to front.

7. The liquid cooling plate according to claim 5 or 6, characterized in that: A plurality of rows of unidirectional flow channel groups are arranged in the flow channel plate, and each row of unidirectional flow channel groups includes a plurality of flow channels which are adjacent to each other and have the same coolant flow direction. The spacing between the groove walls on both sides of the rear notch is matched with the width dimension of the liquid distribution cavity in the left-right direction, and the width dimension of the liquid distribution cavity in the left-right direction is matched with the width of a row of unidirectional flow channel groups on the flow channel plate.

8. The liquid cooling plate according to claim 5 or 6, characterized in that: The interface is arranged on the surface of the plug located in front of the liquid distribution chamber, one end of the channel connected to the liquid distribution tank is connected to the interface and the channel extends backward and / or downward from the interface position, and the other end is connected to the connecting port located in front of the rear slot provided on the tank wall of the liquid distribution tank.

9. A battery box, including a liquid cooling plate, characterized in that: The liquid cooling plate is the liquid cooling plate according to any one of claims 5 to 8.

Images