L-shaped vapor chamber and power battery module

Abstract

The utility model relates to an L-shaped vapor chamber and a power battery module. The L-shaped vapor chamber comprises a first cavity extending in the vertical direction, a second cavity extending in the horizontal direction, a liquid absorption core and a supporting unit. One side of the first cavity is communicated with one side of the second cavity, and the joint of the first cavity and the second cavity is a bending area; the supporting unit comprises first supporting strips which are arranged in the first cavity and extend in the vertical direction, and the first supporting strips divide the inner space of the first cavity into a plurality of spaced air channels. The liquid absorption core is laid in the first cavity and the second cavity. The L-shaped vapor chamber has the advantages of being stable in structure and high in heat transfer efficiency.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of battery heat dissipation, in particular to a L-shaped heat plate and power battery module. BACKGROUND

[0002] With the rapid development of new energy automobile field, the blade battery based on the lithium iron phosphate technology is widely combined into the form of battery module in series or parallel and applied to new energy automobiles due to high energy density, high safety and long cycle life. In the process of vehicle operation, the blade battery will generate a large amount of heat, if the heat cannot be dissipated in time, the charging and discharging efficiency of the battery module will be reduced, the power of the battery module will be affected, and in severe cases, it will also lead to thermal runaway, affecting the safety and life of the battery module.

[0003] In order to effectively dissipate heat of the battery module, various new heat plates for battery module heat dissipation scene are developed, wherein the L-shaped heat plate can quickly spread and conduct the heat generated by the battery to the bottom of the battery, and the heat is dissipated through the liquid cooling plate at the bottom, so that the battery module is changed from the traditional uniform heat dissipation to the direct heat dissipation, and the heat dissipation capacity and limit of the heat plate in the battery module are improved. However, the heat dissipation efficiency of the L-shaped heat plate in the actual application of the blade battery module is often not ideal. UTILITY MODEL CONTENTS

[0004] Based on this, the purpose of the utility model is to provide an L-shaped heat plate and a power battery module.

[0005] An L-shaped heat plate, characterized in that: comprising a first cavity extending in a vertical direction, a second cavity extending in a horizontal direction, a liquid absorption core and a support unit; one side of the first cavity and one side of the second cavity are communicated, and the connection place of the two is a bending area; the support unit comprises a first support strip arranged in the first cavity and extending in a vertical direction, the first support strip separates the internal space of the first cavity into a plurality of interval air channels; the liquid absorption core is laid in the first cavity and the second cavity.

[0006] The L-shaped heat plate, by setting the first support strip to form a physical interval, makes the gaseous working medium only transfer along the extension direction, avoids the free escape of other working media, and improves the heat transfer efficiency. At the same time, the first support strip also plays a supporting role, ensuring the structural stability of the L-shaped heat plate.

[0007] Further, the support unit further comprises a second support strip, the second support strip is arranged in the second cavity, the extension direction is parallel to the extension direction of the second cavity, and extends from the side close to the first cavity to the side away from the first cavity.

[0008] The second support strip supports the second cavity, thereby maintaining the structural stability of the L-shaped vapor chamber.

[0009] Further, in the vertical direction, the two ends of the first support strip are flush with the two end portions of the first cavity; in the horizontal direction, one end of the second support strip is flush with one end portion of the second cavity close to the first cavity, and the other end is spaced apart from one end of the second cavity away from the first cavity.

[0010] Through the above technical solution, the first support strip forms a spacing air channel in the first cavity, so that the gas working medium can only transfer along the spacing air channel, and at the same time, the inner space of the second cavity is connected with each other, and the gas working medium can freely diffuse in the connected part of the second cavity, thereby improving the heat transfer efficiency.

[0011] Further, at least one end of the first support strip close to the bending area is connected with at least one end of the second support strip close to the bending area.

[0012] Through the above technical solution, the first support strip and the second support strip are connected at the bending area to share the stress of the bending area, thereby avoiding wrinkles or collapse of the bending area, and further improving the structural stability of the L-shaped vapor chamber.

[0013] Further, the support unit further comprises a third support strip, the third support strip is arranged between two adjacent first support strips, one end of the third support strip is flush with one end portion of the first cavity close to the second cavity, and is connected with at least one end of the second support strip close to the bending area, and the length of the third support strip is less than the length of the first support strip.

[0014] Through the above technical solution, the third support strip is arranged to assist in supporting and further share the stress of the bending area, thereby improving the structural stability of the L-shaped vapor chamber.

[0015] Further, the support unit further comprises a plurality of support columns, the support columns are arranged equidistantly in the first cavity and / or the second cavity to support the first cavity and / or the second cavity.

[0016] Through the above technical solution, the support columns support the first cavity and the second cavity, so that the L-shaped vapor chamber can maintain a stable shape and structure during work, and prevent collapse or damage caused by thermal deformation or external pressure.

[0017] Further, the wicking core is provided with through holes, first through grooves, second through grooves and third through grooves corresponding to the support columns, the first support strips, the second support strips and the third support strips, respectively, and all of them penetrate through the wicking core.

[0018] Through the technical scheme, the support column, the first support strip, the second support strip, the third support strip and the upper and lower shell plates directly abut against each other, so that damage of the liquid absorption core caused by top pressing is avoided.

[0019] A power battery module comprises a plurality of blade battery units and a liquid cooling plate.

[0020] The blade battery unit comprises a blade battery and two L-shaped heat plates as described above.

[0021] The second cavities of the two L-shaped heat plates are in abutment and tightly adhere to the lower side of the blade battery.

[0022] The liquid cooling plate is arranged below the blade battery unit and tightly adheres to the side of the second cavities of the two L-shaped heat plates away from the blade battery.

[0023] Through the technical scheme, the first cavities of the two L-shaped heat plates can completely adhere to the left side or the right side of the blade battery, so that heat dissipation is more sufficient.

[0024] Further, the length of the second cavity is equal to half of the length of the lower side of the blade battery, and the width of the second cavity is equal to the width of the lower side of the blade battery.

[0025] Through the technical scheme, the second cavities of the two L-shaped heat plates can completely adhere to the lower side of the blade battery after abutment, so that heat dissipation is more sufficient while the heat plates are stacked.

[0026] The L-shaped heat plate provided by the utility model has the following advantages:

[0027] (1) The structure is simple, easy to prepare, and low in preparation cost.

[0028] (2) The first support strip, the third support strip and the second support strip are arranged in the first cavity and the second cavity respectively, so that the structural strength of the L-shaped heat plate is effectively enhanced.

[0029] (3) At least a part of the first support strip, the third support strip and the second support strip are connected, so that the stress of the bending area can be shared, and wrinkles or collapse of the bending area can be avoided.

[0030] (4) The first support bar forms a spacing air channel in the first cavity, so that the gas working medium can only transfer along the extension direction of the spacing air channel, that is, can only transfer in the direction from the evaporation end to the condensation end, the free diffusion of the gas working medium to other directions is avoided, and the heat transfer efficiency of the L-shaped vapor chamber is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 An exploded view of the L-shaped vapor chamber is provided in the utility model;

[0032] Figure 2 For Figure 1 An enlarged view of the middle B;

[0033] Figure 3 For Figure 1 A sectional view along the A-A direction;

[0034] Figure 4 A schematic view of the overall structure of the power battery module is provided in the utility model;

[0035] Figure 5 A schematic view of the structure of the blade battery unit is provided in the utility model.

[0036] In the drawing, 100, L-shaped vapor chamber; 10, first cavity; 20, second cavity; 110, upper shell; 120, lower shell; 121, groove; 30, liquid absorbing core; 31, through hole; 32, first through slot; 33, second through slot; 34, third through slot; 40, support unit; 41, support column; 42, first support bar; 43, second support bar; 44, third support bar; 45, spacing air channel; 300, blade battery unit; 310, blade battery; 400, liquid cooling plate. DETAILED DESCRIPTION

[0037] In the application, the heat conduction of the L-shaped vapor chamber is studied, and it is found that the reason why the heat dissipation efficiency of the L-shaped vapor chamber is not ideal is that, in use, the horizontal plate contacts the liquid cooling plate as the condensation end, the vertical plate contacts the surface of the battery as the evaporation end, after the working medium is vaporized by absorbing heat at the evaporation end, the working medium will not only transfer to the condensation end, but also escape to other directions, and meanwhile, wrinkles or collapse may occur at the bending part, which hinders the transfer of the gaseous working medium and causes the heat transfer rate to decrease. Based on this, the applicant proposes an L-shaped vapor chamber, which sets a support structure in the vapor chamber to share the stress at the bending part, and the support structure forms a physical barrier, so that the gaseous working medium can only transfer to the direction of the condensation end, thereby improving the heat transfer rate.

[0038] In order to better understand and implement, the utility model is described in detail below with reference to the drawings.

[0039] Please refer to Figures 1 to 3 , Figure 1The utility model provides an explosion map of L type even heat plate is provided. Figure 2 For Figure 1 The enlarged view of B in the middle; Figure 3 For Figure 1 The section view along A-A direction in the middle.

[0040] The utility model provides a kind of L type even heat plate 100, including upper shell 110, with the lower shell 120 of fixed connection of upper shell 110 and liquid absorption core 30 and support unit 40.

[0041] The cross section of the upper shell 110 and the lower shell 120 is generally L-shaped, the upper shell 110 covers the lower shell 120, forming a first cavity 10 extending in the vertical direction and a second cavity 20 extending in the horizontal direction, one side of the first cavity 10 and the second cavity 20 is communicated with each other, and the connection of the two is a bending area.

[0042] The support unit 40 includes support columns 41, first support bars 42, second support bars 43 and third support bars 44.

[0043] A plurality of support columns 41 are arranged in the first cavity 10 and / or the second cavity 20, the support columns 41 are equidistantly distributed, and are connected between the upper shell 110 and the lower shell 120, i.e. the support columns 41 in the first cavity 10 are connected between the upper shell 110 and the lower shell 120 in the horizontal direction, and the support columns 41 in the second cavity 20 are connected between the upper shell 110 and the lower shell 120 in the vertical direction, so that the L type even heat plate 100 can maintain a stable shape and structure when working, preventing collapse or damage caused by thermal deformation or external pressure.

[0044] A plurality of first support bars 42 are arranged side by side in the first cavity 10, and the arrangement direction is perpendicular to the extension direction of the first cavity 10 and the second cavity 20. The first support bars 42 extend between the support columns 41 in the vertical direction and are connected between the upper shell 110 and the lower shell 120, which can further improve the structural stability of the first cavity 10. Preferably, in the vertical direction, the first support bars 42 are flush with the two ends of the first cavity 10, and an independent spacing air channel 45 is formed between adjacent two first support bars 42, so that the gaseous working medium can only move in the extension direction of the same spacing air channel 45, avoiding the escape of the gaseous working medium in other directions, thereby enhancing the heat transfer efficiency of the L type even heat plate 100.

[0045] A plurality of second support bars 43 are arranged in the second cavity 20, the second support bars 43 are arranged in the gaps between the support columns 41 and connected between the upper shell 110 and the lower shell 120, which can further improve the structural stability of the second cavity 20. The extending directions of the first support bars 42 and the second support bars 43 are perpendicular to each other when projected along the arrangement direction of the first support bars 42. Preferably, at least one end of the second support bars 43 is flush with one end of the second cavity 20 close to the first cavity 10, and the other end of the second support bars 43 is spaced apart from the other end of the second cavity 20 away from the first cavity 10, so that the inner space of the second cavity 20 is connected to each other. Since the L-shaped vapor chamber 100 is in contact with the liquid cooling plate as a condensing part during operation, at least part of the connection in the second cavity 20 can make the gas working medium freely diffuse in the second cavity 20, further improving the heat exchange efficiency.

[0046] Preferably, one end of the first support bars 42 and the second support bars 43 are connected to share the stress of the bending area, avoid wrinkles or collapse of the bending area, and further improve the structural stability of the L-shaped vapor chamber 100.

[0047] Preferably, a plurality of third support bars 44 are arranged in the first cavity 10, the third support bars 44 are located between two adjacent first support bars 42 and extend in a direction parallel to the extending direction of the first support bars 42, the length of the third support bars 44 is much smaller than the length of the first support bars 42, and one end close to the second cavity 20 is connected to at least one end of the second support bars 43 to assist in supporting and further sharing the stress of the bending area, thereby improving the structural stability of the L-shaped vapor chamber 100.

[0048] The wick 30 is laid on the inner surfaces of the first cavity 10 and the second cavity 20. Specifically, one end of the wick 30 is flush with the end of the first cavity 10 away from the second cavity 20, and the other end of the wick 30 extends along the first cavity 10, passes through the bending area and extends to the inner surface of the second cavity 20, and is flush with the end of the second cavity 20 away from the first cavity 10.

[0049] The wick 30 is laid on the inner surfaces of the first cavity 10 and the second cavity 20. Specifically, one end of the wick 30 is flush with the end of the first cavity 10 away from the second cavity 20, and the other end of the wick 30 extends along the first cavity 10, passes through the bending area and extends to the inner surface of the second cavity 20, and is flush with the end of the second cavity 20 away from the first cavity 10.

[0050] The liquid absorption core 30 is further provided with a first through slot 32, a second through slot 33 and a third through slot 34 corresponding to the first supporting strip 42, the second supporting strip 43 and the third supporting strip 44, respectively, the extending directions of the first through slot 32, the second through slot 33 and the third through slot 34 are parallel to the extending directions of the first supporting strip 42, the second supporting strip 43 and the third supporting strip 44, respectively, and the three through slots all penetrate the liquid absorption core 30, so that the first supporting strip 42, the second supporting strip 43 and the third supporting strip 44 can pass through the corresponding first through slot 32, second through slot 33 and third through slot 34 and directly abut against the inner surfaces of the upper shell 110 and the lower shell 120, avoiding damage to the liquid absorption core 30 caused by top pressing.

[0051] In the embodiment, the first cavity 10 and the second cavity 20 are further filled with a heat dissipation working medium, the heat dissipation working medium is deionized water with an electrical resistivity of 18.2 MΩ*cm, and the internal vacuum degree after vacuumizing treatment is 7 Pa. The heat dissipation working medium is returned to the evaporation end to perform the second stage of heat transfer through the capillary action of the liquid absorption core after condensation, so that the internal heat circulation of the system is realized. In addition, the upper shell 110 and the lower shell 120 are aluminum or copper pieces, so that the L-shaped vapor chamber 100 has good heat exchange performance.

[0052] Please refer to Figure 4 and Figure 5 , Figure 4 The utility model provides a whole structure schematic diagram of power battery module; Figure 5 The utility model provides a structure schematic diagram of blade battery unit.

[0053] The utility model also provides a power battery module, including a plurality of blade battery unit 300 and liquid cooling plate 400. Blade battery unit 300 is arranged side by side and is connected into battery pack by series and / or parallel mode, liquid cooling plate 400 is arranged below blade battery unit 300, and the heat dissipation is accelerated.

[0054] The blade battery unit 300 includes a blade battery 310 and two L-shaped vapor chambers 100, and the two L-shaped vapor chambers 100 are symmetrically arranged on both sides of the blade battery 310 and are attached to the blade battery 310. Specifically, the outer side walls of the first cavities 10 of the two L-shaped vapor chambers 100 are tightly attached to the left and right side surfaces of the blade battery 310, respectively, and the outer side walls of the second cavities 20 of the two L-shaped vapor chambers 100 are in abutment and are tightly attached to the lower side surface of the blade battery 310.

[0055] Preferably, the length of the first cavity 10 is equal to the length of the left side or right side of the blade battery 310, and the width of the first cavity 10 is equal to the width of the left side or right side of the blade battery 310, so that the first cavities 10 of the two L-shaped heat plates 100 are completely matched with the left side and the right side of the blade battery respectively, and the heat dissipation is more sufficient.

[0056] Preferably, the length of the second cavity 20 is equal to half of the length of the lower side of the blade battery 310, and the width of the second cavity 20 is equal to the width of the lower side of the blade battery 310, so that the second cavities 20 of the two L-shaped heat plates 100 are completely matched with the lower side of the blade battery, and the heat dissipation is more sufficient.

[0057] Preferably, the junctions of the two L-shaped heat plates 100 and the blade battery 310 are provided with a heat-conducting mud layer or a heat-conducting silica gel layer, so as to enhance the heat dissipation capacity.

[0058] In the embodiment, the blade battery unit 300 is provided with six groups in a stacked single column arrangement, each blade battery unit 300 is provided with two corresponding L-shaped heat plates 100, the two L-shaped heat plates 100 are closely matched with the left side, the lower side and the right side of the blade battery 310, the number of the liquid cooling plate 400 is one, and the second cavities 20 of the two L-shaped heat plates 100 are closely matched with the liquid cooling plate 400 away from the side of the blade battery 310.

[0059] The utility model provides a kind of L-shaped heat plate and power battery module, L-shaped heat plate is provided with first support strip, third support strip and second support strip in first cavity and second cavity respectively, can support L-shaped heat plate, maintain the structural stability of L-shaped heat plate.At least part of first support strip and third support strip and second support strip are connected in bending area simultaneously, can share the stress of bending area, avoid the collapse of bending area to affect the heat transfer performance of L-shaped heat plate.In addition, first support strip also forms interval air passage in the way of physical isolation in first cavity, so that gas working substance can only transfer in the direction of evaporation end to condensation end, avoid the free diffusion of gas working substance to other directions, to improve the heat transfer performance of L-shaped heat.

[0060] The above-described embodiments only express several implementation manners of the utility model, and the description is more specific and detailed, but it cannot be understood as the limitation of the scope of the utility model patent. It should be pointed out that for ordinary skilled person in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, and the utility model also intends to include these changes and modifications.

Claims

1. An L-shaped heat plate, characterized by: The application relates to a liquid absorbing device, which comprises a first cavity (10) extending in a vertical direction, a second cavity (20) extending in a horizontal direction, a liquid absorbing core (30) and a supporting unit (40); one side of the first cavity (10) and one side of the second cavity (20) are communicated, and the connecting part of the two is a bending area; the supporting unit (40) comprises a first supporting strip (42) arranged in the first cavity (10) and extending in the vertical direction, and the first supporting strip (42) divides the internal space of the first cavity (10) into a plurality of interval air channels (45); the liquid absorbing core (30) is arranged in the first cavity (10) and the second cavity (20).

2. The L-shaped vapor chamber of claim 1, wherein: The supporting unit (40) further comprises a second supporting strip (43), which is arranged in the second cavity (20) and extends in a direction parallel to the extending direction of the second cavity (20) and extends from the side close to the first cavity (10) to the side away from the first cavity (10).

3. The L-shaped vapor chamber of claim 2, wherein: In the vertical direction, the two ends of the first supporting strip (42) are flush with the two end parts of the first cavity (10); in the horizontal direction, one end of the second supporting strip (43) is flush with the end part of the second cavity (20) close to the first cavity (10), and the other end is spaced apart from the end of the second cavity (20) away from the first cavity (10) by a certain distance.

4. The L-shaped vapor chamber of claim 3, wherein: At least one end of the first supporting strip (42) close to the bending area is connected with at least one end of the second supporting strip (43) close to the bending area.

5. The L-shaped vapor chamber of claim 4, wherein: The supporting unit (40) further comprises a third supporting strip (44), which is arranged between two adjacent first supporting strips (42), one end of the third supporting strip (44) is flush with the end part of the first cavity (10) close to the second cavity (20), and is connected with at least one end of the second supporting strip (43) close to the bending area, and the length of the third supporting strip (44) is smaller than the length of the first supporting strip (42).

6. The L-shaped vapor chamber of claim 5, wherein: The supporting unit (40) further comprises a plurality of supporting columns (41), which are arranged equidistantly in the first cavity (10) and / or the second cavity (20) to support the first cavity (10) and / or the second cavity (20).

7. The L-shaped vapor chamber of claim 6, wherein: The liquid absorbing core (30) is provided with through holes (31), first through grooves (32), second through grooves (33) and third through grooves (34) corresponding to the supporting columns (41), the first supporting strips (42), the second supporting strips (43) and the third supporting strips (44) respectively, and the four through holes pass through the liquid absorbing core (30).

8. A power battery module, comprising a plurality of blade battery units (300) and a liquid cooling plate (400); the blade battery units (300) are arranged side by side. The blade battery unit (300) comprises a blade battery (310) and two L-shaped heat plates (100) according to any one of claims 1-7; the first cavities (10) of the two L-shaped heat plates (100) are respectively arranged on the left and right sides of the blade battery (310) and closely adhere to the blade battery (310); the second cavities (20) of the two L-shaped heat plates (100) are opposite to each other and closely adhere to the lower side of the blade battery (310); The liquid cooling plate (400) is arranged below the blade battery unit (300) and closely adheres to the side of the second cavities (20) of the two L-shaped heat plates (100) away from the blade battery (310).

9. The power battery module according to claim 8, characterized in that: The length of the first cavity (10) is equal to the length of the left side or the right side of the blade battery (310), and the width of the first cavity (10) is equal to the width of the left side or the right side of the blade battery (310).

10. The power battery module of claim 8, wherein: The length of the second cavity (20) is equal to half of the length of the lower side of the blade battery (310), and the width of the second cavity (20) is equal to the width of the lower side of the blade battery (310).

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