Air trapping prevention plug device for liquid cooling plate of power battery

Abstract

The utility model discloses an air trapping prevention plug device for a liquid cooling plate of a power battery, and belongs to the technical field of liquid cooling plates. Comprising a plug body used for being installed on the side, opposite to a water inlet and outlet nozzle, of the liquid cooling plate; the plug body is defined by a plugging plate and a water passing plate, the two ends of the water passing plate are in transition connection with the plugging plate through connecting surfaces, and the connecting surfaces abut against the upper inner wall and the lower inner wall of the liquid cooling plate; water passing holes are formed in the two ends of the water passing plate, and the positions where the water passing holes are located are close to the connecting face. When water enters the upper-layer water inlet flow channel of the liquid cooling plate, as the water passing holes are formed in the upper end of the whole water passing plate, cooling liquid is forced to rise to exhaust air at the top of the upper-layer water inlet flow channel, so that the problem of air trapping is solved, and the cooling effect of the liquid cooling plate is improved; and the liquid level fluctuation of the automobile cooling liquid kettle can be further eliminated.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of liquid cooling plate, concretely relates to a power battery liquid cooling plate anti-trapped gas plug device. BACKGROUND

[0002] In recent years, new energy vehicles taking lithium ion batteries as energy carriers and output sources are rapidly popularized in the global range. A large amount of heat is generated in the charging and discharging process of lithium ion batteries, and the peak heat generation power can even reach more than 5kW. Since the heat generated by the battery pack cannot be timely dissipated, the battery pack self-ignition accident occurs frequently, which poses a severe challenge to the safety and reliability of the battery pack. Therefore, reducing the temperature of the battery pack through the liquid cooling plate during the charging and discharging process has become one of the important measures to ensure the service life and improve the reliability of the battery pack.

[0003] The rationality of the design of the liquid cooling plate is directly related to its cooling performance. However, in engineering practice, the traditional liquid cooling plate design often has the problem of internal trapped gas. This trapped gas phenomenon can cause the liquid level of the automobile liquid kettle to be unstable, seriously affecting the user experience; at the same time, trapped gas can also cause the local temperature of the liquid cooling plate to rise, resulting in uneven temperature field of the battery cell, further affecting the overall performance and safety of the battery pack.

[0004] At present, most of the plugs of the liquid cooling plate adopt the traditional solid plug design, which usually presents a rectangular or cylindrical structure, and the main function is to block the flow channel. These traditional plugs, due to their simple structure, can only achieve the function of blocking the fluid, and cannot solve the problems of flow distribution and trapped gas. UTILITY MODEL CONTENTS

[0005] The utility model is proposed in view of the above problems existing in the prior art, and a power battery liquid cooling plate anti-trapped gas plug device which can solve the trapped gas problem of the liquid cooling plate and realize the flow size control of the liquid cooling plate is provided.

[0006] The utility model can be realized through the following technical schemes:

[0007] A power battery liquid cooling plate anti-trapped gas plug device, comprising:

[0008] A plug body for mounting on one side of the liquid cooling plate opposite the water inlet and outlet nozzle;

[0009] The plug body is enclosed by a blocking plate and a water passing plate, and the two ends of the water passing plate are transitionally connected to the blocking plate through connecting surfaces, wherein

[0010] The connecting surfaces abut against the upper and lower inner walls of the liquid cooling plate;

[0011] Water passing holes are formed at the two ends of the water passing plate, and the water passing holes are located close to the connecting surfaces.

[0012] As a further improvement of the utility model, the water passing plate has a horizontal surface and a flow guide surface, the flow guide surface is arranged obliquely on both sides of the horizontal surface, and the water passing hole is arranged at one end of the flow guide surface close to the connecting surface.

[0013] As a further improvement of the utility model, the upper and lower flow guide surfaces of the water passing plate are arranged respectively corresponding to the upper water inlet channel and the lower water outlet channel of the liquid cooling plate, and the horizontal surface is arranged corresponding to the middle water inlet channel and the middle water outlet channel of the liquid cooling plate.

[0014] As a further improvement of the utility model, the horizontal surface is provided with a plurality of throttling holes and is communicated with the middle water inlet channel and the middle water outlet channel of the liquid cooling plate.

[0015] As a further improvement of the utility model, the flow guide surface of the water passing plate corresponding to the lower water outlet channel of the liquid cooling plate is provided with a throttling hole, and the throttling hole is located at one end of the flow guide surface away from the water passing hole.

[0016] As a further improvement of the utility model, an internal flow guide channel is formed between the plugging plate and the water passing plate, and the water passing hole and the throttling hole are respectively communicated with the internal flow guide channel.

[0017] As a further improvement of the utility model, the side surface of the plugging plate in contact with the liquid cooling plate is a welding surface, and the plugging plate is welded with the liquid cooling plate through the welding surface.

[0018] As a further improvement of the utility model, the side surface of the water passing plate in contact with the liquid cooling plate is a sealing surface.

[0019] As a further improvement of the utility model, a gap smaller than 0.1mm is formed between the sealing surface and the liquid cooling plate by the cooperation tolerance.

[0020] As a further improvement of the utility model, the inner wall of the plugging plate arranged towards the water passing plate is a plugging surface.

[0021] Compared with the prior art, the utility model has the beneficial effects that:

[0022] 1. Improve the cooling efficiency: through the design of the obliquely arranged flow guide surface, the cooling liquid is forced to rise to remove the air at the top of the uppermost channel and the top of the lowermost channel. When the cooling liquid flows in, the flow guide surface guides the flow direction of the cooling liquid, helps to effectively remove the air accumulated at the top of the water inlet channel, solves the problem of air accumulation, improves the cooling effect of the liquid cooling plate, and further eliminates the liquid level fluctuation of the automobile cooling liquid pot;

[0023] 2. Optimized flow distribution: By adjusting the aperture size of the orifice at different positions, the flow resistance of the coolant through the plug can be changed, thereby achieving precise control of the coolant flow and optimizing the flow distribution;

[0024] 3. Improved air discharge efficiency: The inclination angle of the flow guide surface ranges from 30° to 60°. The inclination angle of the flow guide surface determines the rising or falling trend of the coolant entering the plug. By setting an appropriate inclination angle, the coolant can be guided to flow in the intended direction, and at the same time, it helps to discharge the air accumulated at the top of the flow channel. This angle range is selected based on the principles of fluid mechanics and actual application requirements, aiming to optimize the coolant flow path and ensure effective air discharge;

[0025] 4. Enhanced sealing performance: The sealing plate is welded to the liquid cooling plate through the welding surface, and a gap of less than 0.1mm is formed between the sealing surface of the sealing plate and the liquid cooling plate due to the mating tolerance, achieving good sealing effect. The small gap of less than 0.1mm ensures that the coolant can only flow through the designed orifice, avoiding unintended bypass flow, achieving precise control of the coolant flow, and ensuring uniform flow distribution in each layer of the flow channel. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is the axonometric view of the plug body of the utility model;

[0027] Figure 2 is the front view of the plug body of the utility model;

[0028] Figure 3 is the side view of the plug body of the utility model;

[0029] Figure 4 is the structure schematic diagram of the plug body of the utility model being installed inside the liquid cooling plate;

[0030] Figure 5 is the plug body of the utility model; Figure 4 is the local enlarged view of A in the plug body.

[0031] In the figure, 100, plug body; 110, water passing plate; 111, horizontal surface; 112, flow guide surface; 113, sealing surface; 120, sealing plate; 121, welding surface; 122, sealing surface; 130, connecting surface; 140, water passing hole; 150, orifice; 160, internal flow guide channel;

[0032] 200, liquid cooling plate; 210, water inlet nozzle; 220, water outlet nozzle; 230, upper layer water inlet flow channel; 240, middle layer water inlet flow channel; 250, middle layer water outlet flow channel; 260, lower layer water outlet flow channel. DETAILED DESCRIPTION

[0033] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. The technical methods of the present invention will be further described, but the present invention is not limited to these embodiments.

[0034] like Figures 1-5 As shown, this utility model provides a power battery liquid cooling plate anti-stuck air plug device, comprising:

[0035] The plug body 100 is used to be installed on the side of the liquid cooling plate 200 opposite to the inlet / outlet nozzle 220;

[0036] The plug body 100 is formed by an integrally connected water-passing plate 110 and a sealing plate 120. Both ends of the water-passing plate 110 are connected to the sealing plate 120 via connecting surfaces 130. The sealing plate 120 and the water-passing plate 110 are integrally molded, enhancing the overall strength and sealing performance of the plug body 100 and ensuring long-term reliability.

[0037] When the plug body 100 is installed inside the liquid cooling plate 200, the water-passing plate 110 is arranged facing the flow channel of the liquid cooling plate 200, and the connecting surface 130 abuts against the upper and lower inner walls of the liquid cooling plate 200 to ensure that the coolant can only pass through the water-passing plate 110.

[0038] Water passage holes 140 are provided at both ends of the water passage plate 110, and the water passage holes 140 are located close to the connecting surface 130.

[0039] It should be noted that, due to gravity, the traditional plugs currently in use cannot completely fill the upper water inlet channel 230 of the liquid cooling plate 200 as the coolant flows through it. Usually, some air remains at the top of the channel and cannot be expelled.

[0040] In this embodiment, the liquid cooling plate 200 has an upper water inlet channel 230, a lower water outlet channel 240, a middle water inlet channel 250, and a middle water outlet channel 260, such as Figures 4-5 As shown, when water enters the upper water inlet channel 230, the water passage 140 is located at the top of the entire water passage plate 110, which forces the coolant to rise to expel the air at the top of the upper water inlet channel 230. Similarly, the coolant flowing out of the lower water outlet channel 260 will also expel the air at the top as the liquid level rises, thereby solving the problem of trapped air and improving the cooling effect of the liquid cooling plate 200. After the cooling effect of the liquid cooling plate 200 is improved, the fluctuation of the liquid level in the car coolant reservoir can be further eliminated.

[0041] Preferably, the water passing plate 110 has a horizontal surface 111 and a guide surface 112, which is inclinedly arranged on both sides of the horizontal surface, and a water passing hole 140 is arranged at one end of the guide surface 112 close to the connecting surface 130, wherein the guide surface 112 located at the upper water inlet flow channel 230 is arranged upwardly compared to the flow direction of the cooling liquid, and the guide surface 112 located at the top of the lower water outlet flow channel 260 is arranged downwardly compared to the flow direction of the cooling liquid, so that the guide surface 112 arranged in this way can guide the cooling liquid to flow in the expected direction, and help to remove the air accumulated at the top of the flow channel.

[0042] Preferably, the inclination angle of the guide surface 112 ranges between 30° and 60°, and the inclination angle of the guide surface 112 determines the upward or downward trend of the cooling liquid when entering the plug, and this angle range is selected based on the principles of fluid mechanics and actual application requirements, aiming to optimize the cooling liquid flow path and ensure effective air removal, wherein,

[0043] The minimum inclination angle of 30° ensures sufficient inclination to enable the cooling liquid to smoothly rise or fall under the action of gravity, avoiding poor flow of the cooling liquid due to too small angle;

[0044] The maximum inclination angle of 60° prevents the cooling liquid flow resistance from increasing due to too large angle, affecting flow distribution and cooling efficiency.

[0045] Preferably, the upper and lower guide surfaces 112 of the water passing plate 110 correspond to the upper water inlet flow channel 230 and the lower water outlet flow channel 260 of the liquid cooling plate 200, respectively, and the horizontal surface 111 corresponds to the middle water inlet flow channel 240 and the middle water outlet flow channel 250 of the liquid cooling plate 200.

[0046] That is, when the liquid cooling plate 200 is filled with water, the cooling liquid simultaneously flows into the upper water inlet flow channel 230 and the middle water inlet flow channel 240, and then flows out of the middle water outlet flow channel 240 and the lower water outlet flow channel 260 after passing through the plug body 100.

[0047] Preferably, the horizontal surface 111 is provided with a plurality of throttling holes 150 and communicates with the middle water inlet flow channel 240 and the middle water outlet flow channel 250 of the liquid cooling plate 200, and the guide surface 112 of the water passing plate 110 corresponding to the lower water outlet flow channel 260 of the liquid cooling plate 200 is also provided with a throttling hole 150, which is located at one end of the guide surface 112 away from the water passing hole 140.

[0048] Preferably, the internal flow channel 160 is formed between the blocking plate 120 and the water passing plate 110, and the water passing hole 140 and each throttling hole 150 are respectively communicated with the internal flow channel 160. When the cooling liquid enters the water inlet 210 of the liquid cooling plate 200 and flows to the plug, the cooling liquid is first introduced into the internal flow channel 160 of the plug body 100, then distributed to each throttling hole 150 and the water passing hole 140 through the internal flow channel 160, and finally flows out from the water outlet 220 through the water outlet flow channel of the liquid cooling plate 200.

[0049] The positions of the water passing hole 140 of the water passing plate 110 and the throttling hole 150 are specifically set as follows:

[0050] The water passing hole 140 of the upper flow guide surface 112 is set as follows:

[0051] The water passing hole 140 is arranged at the top of the flow guide surface 112 of the upper water inlet flow channel 230 of the liquid cooling plate 200. The position is selected to utilize the pressure and flow direction of the cooling liquid when entering, so as to force the cooling liquid to rise, thereby effectively removing the air at the top of the uppermost flow channel and ensuring that the cooling liquid can fully contact all areas that need to be cooled, thereby improving the cooling effect.

[0052] The throttling hole 150 of the horizontal surface 111 is set as follows:

[0053] The horizontal surface 111 of the plug body 100 is located in the middle water inlet flow channel 240 and the middle water outlet flow channel 250 of the liquid cooling plate 200, and the horizontal surface 111 has a plurality of throttling holes 150 corresponding to the middle water inlet flow channel 240 and the middle water outlet flow channel 250 of the liquid cooling plate 200.

[0054] The water passing hole 140 and the throttling hole 150 of the lower flow guide surface 112 are set as follows:

[0055] The throttling hole 150 is arranged at the top of the flow guide surface 112 of the lower water outlet flow channel 260 of the liquid cooling plate 200, and the water passing hole 140 is arranged at the bottom of the flow guide surface 112. Similarly, since the flow guide surface 112 is inclined, the cooling liquid entering the internal flow channel 160 of the plug body 100 will flow out from the water passing hole 140 at the bottom of the flow guide surface 112, and part of the cooling liquid will rise along the flow guide surface 112 as the liquid level rises, and finally flow out from the throttling hole 150 at the top of the flow guide surface 112, thereby helping to remove the air that may exist at the top of the lowermost flow channel.

[0056] Specifically, the cooling liquid enters the liquid cooling plate 200 from the water inlet nozzle 210 and is distributed to the upper layer water inlet flow channel 230 and the middle layer water inlet flow channel 240. The cooling liquid in the upper layer water inlet flow channel 230 rises along the flow guide surface 112, and after the air at the top of the upper layer water inlet flow channel 230 is discharged, the cooling liquid enters the internal flow guide channel 160 of the plug body 100. At the same time, the cooling liquid in the middle layer water inlet flow channel 240 directly passes through the throttle hole 150 of the horizontal surface 111 and enters the internal flow guide channel 160 of the plug body 100.

[0057] The cooling liquid in the internal flow guide channel 160 falls automatically under the action of gravity. As the internal flow guide channel 160 is gradually filled with cooling liquid, the cooling liquid flows out through the throttle hole 150 of the horizontal surface 111 and the water passing hole 140 and the throttle hole 150 of the flow guide surface 112 in the lower layer water outlet flow channel 260, and enters the middle layer water outlet flow channel 250 and the lower layer water outlet flow channel 260. In this process, since the lower layer water outlet flow channel 260 also has a flow guide surface 112, the air at the top of the flow channel can also be smoothly discharged, and finally the cooling liquid can be uniformly distributed in each flow channel of the liquid cooling plate 200, ensuring uniform cooling of the liquid cooling plate 200 and avoiding local overheating.

[0058] It should be noted that by adjusting the size of the throttle hole 150 at different positions, the flow resistance of the cooling liquid passing through the plug can be changed, thereby achieving precise control of the cooling liquid flow and optimizing the flow distribution.

[0059] Preferably, the side surface of the sealing plate 120 in contact with the liquid cooling plate 200 is a welding surface 121, and the sealing plate 120 is welded to the liquid cooling plate 200 through the welding surface 121, ensuring the stability and firmness of the plug body 100 after installation, and improving the sealing between the plug body 100 and the liquid cooling plate 200, effectively preventing cooling liquid leakage and ensuring the reliability of the cooling system.

[0060] Preferably, the side surface of the water passing plate 110 in contact with the liquid cooling plate 200 is a sealing surface 113. Specifically, a gap of less than 0.1 mm is formed between the sealing surface 113 and the liquid cooling plate 200 by the fitting tolerance. The small gap of less than 0.1 mm ensures that the cooling liquid can only flow through the designed throttle hole 150, avoiding unintended bypass flow, achieving precise control of the cooling liquid flow, and ensuring uniform flow distribution in each layer flow channel.

[0061] Preferably, the inner wall of the sealing plate 120 facing the water passing plate 110 is a sealing surface 122, which forms a closed space, i.e. the internal flow guide channel 160, between the sealing plate 120 and the water passing plate 110, guiding the cooling liquid to flow inside the plug body 100 and be distributed to each water outlet flow channel.

[0062] In addition, the material of the plug body 100 is aluminum alloy, and the high thermal conductivity of the aluminum alloy helps to quickly conduct and dissipate heat, improves the cooling efficiency, and the aluminum alloy is light in weight, which helps to reduce the weight of the entire cooling system, and is particularly suitable for application in the power battery system sensitive to weight.

[0063] The overall size of the plug body 100 has no fixed value and should be matched with the internal flow channel size of the actual liquid cooling plate 200. The size of the plug can be customized according to the internal structure of the specific liquid cooling plate 200 to ensure the best installation effect and sealing performance. At the same time, this plug structure can also adapt to liquid cooling plates 200 of different specifications and models, enhancing its versatility and application range.

[0064] Similarly, the shape of each throttle hole 150 is also not specifically limited, and can be a regular shape such as trapezoidal, triangular, rectangular, circular, etc. It can also be set to an irregular shape.

[0065] The technical means disclosed in the utility model scheme are not limited to the technical means disclosed in the above technical means, and also include technical solutions composed of any combination of the above technical features. The above is the specific implementation of the utility model, and it should be pointed out that for ordinary skilled persons in the technical field, without departing from the principle of the utility model, some improvements and refinements can be made, which are also considered as the protection range of the utility model.

[0066] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the utility model embodiment are only used to explain the relative position relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings), if the specific posture changes, the directional indication also changes accordingly.

[0067] In addition, the description of "one", "one", etc. in the utility model is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "one" and "one" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0068] In the utility model, unless another definite provision and limitation, the term "connect", "fix" and so on should do the broad sense understanding, for example, "fix" can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electric connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two element inside's intercommunication or two element's mutual action relation, unless another definite limitation.For the ordinary skill in the art, the specific meaning of the above-mentioned term in the utility model can be understood according to the specific circumstances.

[0069] In addition, the technical solutions of various embodiments of the present application can be combined with each other, but must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, also not within the protection scope required by the present application.

Claims

1. A power battery liquid cooling plate anti-trapping gas plug device, characterized in that, The application relates to a liquid cooling plate plug body. The plug body is enclosed by a blocking plate and a water passing plate, and the two ends of the water passing plate are connected to the blocking plate through connecting surfaces. The connecting surfaces abut the upper and lower inner walls of the liquid cooling plate. Water passing holes are arranged at the two ends of the water passing plate, and the water passing holes are located close to the connecting surfaces. The water passing plate has a horizontal surface and guide surfaces, the guide surfaces are arranged on the two sides of the horizontal surface, and the water passing holes are arranged at one end of the guide surfaces close to the connecting surfaces.

2. The device according to claim 1, wherein, The upper and lower guide surfaces of the water passing plate correspond to the upper water inlet channel and the lower water outlet channel of the liquid cooling plate, and the horizontal surface corresponds to the middle water inlet channel and the middle water outlet channel of the liquid cooling plate.

3. The device according to claim 2, wherein, The horizontal surface is provided with a plurality of throttling holes and is in communication with the middle water inlet channel and the middle water outlet channel of the liquid cooling plate.

4. The device according to claim 2, wherein, The guide surface of the water passing plate corresponding to the lower water outlet channel of the liquid cooling plate is provided with a throttling hole, and the throttling hole is located at one end of the guide surface away from the water passing hole.

5. The device according to claim 2, wherein, The blocking plate and the water passing plate form an internal guide channel, and the water passing holes and the throttling holes are in communication with the internal guide channel.

6. The device according to claim 5, wherein, The side surface of the blocking plate in contact with the liquid cooling plate is a welding surface, and the blocking plate is welded to the liquid cooling plate through the welding surface.

7. The device according to claim 1, wherein, The side surface of the water passing plate in contact with the liquid cooling plate is a sealing surface.

8. The device according to claim 1, wherein, The gap between the sealing surface and the liquid cooling plate is less than 0.1 mm due to the matching tolerance.

9. The device according to claim 8, wherein, The inner wall of the blocking plate arranged towards the water passing plate is a blocking surface.

10. The device according to claim 1, wherein, ​

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