Vapor chamber for blade battery

Abstract

The utility model relates to a vapor chamber for a blade battery. The vapor chamber for the blade battery comprises a first base plate, a second base plate and a composite liquid absorbing core, and is characterized in that the first base plate covers the second base plate to form a sealed accommodating space, and the composite liquid absorbing core and a working medium are arranged in the accommodating space; the composite liquid absorbing core comprises a groove liquid absorbing core and a fiber sintering core, the groove liquid absorbing core is provided with a groove, and the fiber sintering core is laid on the groove in the extending direction of the groove. According to the vapor chamber for the blade battery, the composite liquid absorbing core formed by sintering the fiber sintering core and the groove liquid absorbing core is adopted, the vapor chamber has more excellent capillary performance, the heat dissipation capacity is improved, meanwhile, the grooves and the supporting columns in the groove liquid absorbing core are alternately distributed to play a supporting role, point columns do not need to be additionally arranged for supporting, and the cost is reduced. And the thickness of the vapor chamber can be further reduced.

Description

Technical Field

[0001] This utility model relates to the field of heat sinks, and in particular to a heat spreader for blade batteries. Background Technology

[0002] As electronic technology is rapidly developing towards miniaturization, high power consumption, and lightweighting, the heat flux density of electronic components is constantly increasing, and the heat generated is also increasing. The field of thermal management of electronic devices, i.e. heat dissipation and heat transfer, is facing a major technical challenge.

[0003] As a passive heat exchanger for liquid phase change heat transfer, a vapor chamber possesses excellent heat dissipation capabilities, strong temperature uniformity, and requires no external power drive, effectively improving the thermal management of electronic devices. A traditional vapor chamber mainly consists of upper and lower substrates that provide the basic support, a vacuum cavity formed between the upper and lower substrates, and a wicking core within the vacuum cavity that provides a fine structure. The performance of the wicking core plays a decisive role in the heat transfer performance of the vapor chamber. As a channel for the condensation and reflux of the working fluid within the vapor chamber, the wicking core relies on capillary pressure to provide the circulation power. Common wicking core structures can be broadly classified into sintered metal powder wicking cores, copper mesh wicking cores, grooved wicking cores, and foamed metal wicking cores.

[0004] With the development of technology, in order to minimize installation space, the thickness of existing heat spreaders is becoming thinner and thinner. Under the trend of increasingly thinner heat spreaders, heat spreaders using a single liquid wick structure will have the following problems: the porosity of the liquid wick using sintered metal powder is relatively low, which affects the liquid transport capacity; the thermal conductivity of the copper mesh liquid wick is relatively poor; the capillary suction capacity of the grooved liquid wick is limited; and the pores of the foam metal liquid wick are large and unevenly distributed, resulting in lower mechanical properties. Utility Model Content

[0005] Therefore, the purpose of this utility model is to provide a heat spreader for blade batteries.

[0006] A heat spreader for a blade battery includes: a first substrate, a second substrate, and a composite absorbent core, characterized in that: the first substrate covers the second substrate to form a sealed accommodating space, the accommodating space being provided with the composite absorbent core and a working fluid; the composite absorbent core includes a grooved absorbent core and a fiber sintered core, the grooved absorbent core having grooves, and the fiber sintered core being laid on the grooves along the extension direction of the grooves.

[0007] Furthermore, the grooved liquid-absorbing core has multiple grooves, and adjacent grooves are separated by a support pillar. The support pillar faces the upper end surface of the first substrate and abuts against the inner surface of the first substrate. This technical solution enables the heat dissipation plate to have stronger heat dissipation capabilities.

[0008] Furthermore, the grooves extend along the length of the groove suction core, and the extension directions of each groove are parallel to each other.

[0009] Furthermore, the cross-section of the support column is trapezoidal, and the width of the upper end away from the groove is smaller than the width of its lower end.

[0010] Furthermore, multiple airflow channels are formed between the inner surface of the first substrate facing the second substrate and the trench. In the trench extension direction, the length of the trench suction core is equal to the accommodating space, ensuring that each airflow channel is independent. This technical solution avoids weakening the capillary capacity of the suction core in the trench extension direction by ensuring the airflow channels are interconnected.

[0011] Furthermore, the upper end face of the fiber sintered core abuts against the inner surface of the first substrate, and the airflow channel is located beside the fiber sintered core. Through the above technical solution, a gas-liquid coplanar structure is formed.

[0012] Furthermore, the working fluid is deionized water, ethanol, or Freon.

[0013] Furthermore, a passivation layer is provided on the inner surfaces of the first substrate and the second substrate, as well as the outer surface of the composite absorbent core. This technical solution prevents the working fluid from corroding the inner surfaces of the first substrate and the second substrate, and the outer surface of the composite absorbent core.

[0014] Furthermore, both the first and second substrates are made of aluminum. This technical solution enables the heat spreader to have a lighter weight.

[0015] The heat spreader provided by this utility model has the following advantages:

[0016] (1) A grooved liquid-absorbing core with grooves is obtained by laser cutting, and a composite liquid-absorbing core with airflow channels is obtained by laying fiber sintering core along the length of the grooves. This makes the composite liquid-absorbing core have excellent capillary properties and wettability, which can effectively improve the heat transfer performance of the ultrathin heat exchange plate.

[0017] (2) The grooved liquid suction core is formed by laser cutting to form a groove and support structure. The grooves and supports are distributed alternately to provide support, which can ensure that the ultra-thin heat spreader will not collapse during operation.

[0018] (3) A sintered fiber core is laid along the length of the trench. The cavity next to the fiber core serves as an airflow channel, forming a gas-liquid coplanar structure. There is no need to set up another air cavity based on the support column, which further reduces the thickness of the heat spreader. Attached Figure Description

[0019] Figure 1This is an exploded structural diagram of the heat spreader plate for blade batteries provided by this utility model.

[0020] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0021] Figure 3 The front view of the heat spreader plate provided by this utility model, projected along the extension direction of the groove;

[0022] Figure 4 A schematic diagram of the composite liquid absorption core structure provided by this utility model;

[0023] Figure 5 A schematic diagram of the grooved liquid suction core provided by this utility model;

[0024] Figure 6 This is a schematic diagram of the structure of the fiber sintered core provided by this utility model.

[0025] In the figure, 1 is the first substrate; 2 is the second substrate; 3 is the composite liquid-absorbing core; 31 is the groove liquid-absorbing core; 311 is the groove; 312 is the support column; 313 is the airflow channel; and 32 is the fiber sintered core. Detailed Implementation

[0026] In their research on traditional liquid absorber cores, the applicant discovered that, compared to traditional powder-sintered liquid absorber cores, oriented fiber sintered cores prepared using the finite fiber sintering method exhibit superior capillary properties and wettability along their length. Furthermore, these properties and wettability increase with increasing order. Moreover, after the fibers are arranged in an ordered manner using the finite fiber sintering method, the oriented fiber sintered core can be processed using hydraulic methods, allowing the sample to achieve the desired ultrathin thickness. Based on these findings, the applicant proposes a heat spreader for blade batteries.

[0027] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings.

[0028] Please refer to Figures 1-6 , Figure 1 This is an exploded structural diagram of the heat spreader plate for blade batteries provided by this utility model. Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 The front view of the heat spreader plate provided by this utility model, projected along the extension direction of the groove;

[0029] Figure 4 This is a schematic diagram of the composite liquid absorption core structure provided by this utility model. Figure 5 A schematic diagram of the grooved liquid-absorbing core provided by this utility model; Figure 6 This is a schematic diagram of the structure of the fiber sintered core provided by this utility model.

[0030] This utility model provides a heat spreader for blade batteries, comprising: a first substrate 1, a second substrate 2, and a composite liquid absorbent core 3.

[0031] The first substrate 1 covers the second substrate 2, and a sealed accommodating space (not labeled) is formed between the first substrate 1 and the second substrate 2. The composite liquid-absorbing core 3 is located in the accommodating space, and the accommodating space is filled with working fluid.

[0032] The first substrate 1 and the second substrate 2 can be made of various materials, such as copper and its alloys, aluminum and its alloys, stainless steel, PI film, etc. In this embodiment, the first substrate 1 and the second substrate 2 are aluminum parts, which are extruded by corresponding molds. Preferably, a passivation layer is provided on the opposing inner surfaces of the first substrate 1 and the second substrate 2 to prevent the working fluid from corroding the inner surfaces of the first substrate 1 and the second substrate 2.

[0033] The composite liquid-absorbing core 3 can be made of various materials, such as copper and its alloys, aluminum and its alloys, and non-metallic materials. This embodiment uses an aluminum-based composite liquid-absorbing core 3, comprising a grooved liquid-absorbing core 31 and a fiber sintered core 32. The grooved liquid-absorbing core 31 is an aluminum plate with a micro-powder structure as described in the prior art. One side of its surface is laser-cut to form multiple parallel and spaced grooves 311 and support pillars 312, with each support pillar 312 located between two adjacent grooves 311.

[0034] Preferably, the first substrate 1, the second substrate 2, and the composite liquid-absorbing core 3 are made of the same material.

[0035] Preferably, the groove 311 extends along the length direction of the groove suction core 31.

[0036] Preferably, the cross-section of the support column 312 is trapezoidal, that is, both sides of the support column 312 are inclined surfaces, and the width of the upper end of the support column 312 away from the groove 311 is smaller than the width of its lower end. Further, fiber sintered cores 32 are laid along the length of all grooves 311. In this embodiment, the fiber sintered core 32 can be formed by mixing and sintering oriented aluminum metal fibers and aluminum metal powder of a certain mesh size, possessing the fiber-powder mixed microstructure of the prior art, avoiding poor capillary performance in local areas caused by uneven sintering of the fiber sintered core 32. The oriented fiber powder sintered core 32 and the grooved liquid-absorbing core 31 are sintered together to form the composite liquid-absorbing core 3. Preferably, a passivation layer is provided on the surface of the composite liquid-absorbing core 3 to prevent the working fluid from corroding the outer surface of the composite liquid-absorbing core 3.

[0037] The composite liquid-absorbing core 3 is placed on the second substrate 2, with the side having the groove 311 facing away from the inner surface of the second substrate 2. The inner surface of the first substrate 1 facing the second substrate 2 is in contact with the upper surface of the support column 312 facing the first substrate 1, so as to form a plurality of airflow channels 313 in the groove 311.

[0038] Preferably, in the extension direction of the groove 311, the length of the groove suction core 31 is equal to that of the accommodating space, that is, the two ends of the groove suction core 31 in the length direction abut against the two end faces of the accommodating space, so that each airflow channel 313 is independent of each other, and the airflow channels 313 are prevented from being interconnected and weakening the capillary capacity of the composite suction core 3 in the extension direction of the groove 311.

[0039] Preferably, the upper end face of the fiber sintered core 32 abuts against the inner surface of the first substrate 1, and the airflow channel 313 is located on both sides of the fiber sintered core 32, thereby forming a gas-liquid coplanar structure, which improves the heat transfer performance of the heat spreader while ensuring the ultrathinness of the heat spreader.

[0040] Furthermore, the working medium can be deionized water, ethanol, Freon, etc.

[0041] The heat spreader provided by this utility model has a liquid cavity provided by the groove 311 and the fiber sintered core 32, and an air cavity provided by the airflow channels 313 on both sides of the fiber sintered core 32. During operation, the first substrate 1 or the second substrate 2 of the heat spreader is in contact with the heat source. Heat is transferred from the heat source to the evaporation end of the heat spreader. The working fluid liquid absorbs heat and evaporates into saturated working fluid vapor. Under the action of pressure difference, it flows along the length of the air cavity to the condensation end. The working fluid vapor releases heat at the condensation end and becomes working fluid liquid. Under the action of capillary pressure of the liquid suction core, it flows back to the evaporation end to start the next working cycle.

[0042] The ultra-thin heat spreader provided by this utility model has the following beneficial effects:

[0043] (1) A grooved liquid-absorbing core 31 with grooves 311 is obtained by laser cutting, and a composite liquid-absorbing core 3 with airflow channels 313 is obtained by laying fiber sintered core 32 along the length direction of grooves 311. The composite liquid-absorbing core 3 has excellent capillary performance and wettability, which can effectively improve the heat transfer performance of the ultrathin heat exchange plate.

[0044] (2) The first substrate 1 and the second substrate 2 are separate shell plates extruded by corresponding molds. The grooved liquid-absorbing core 31 is formed by laser cutting to form a structure of groove 311 and support column 312. The groove 311 and support column 312 are alternately distributed to provide support and ensure that the ultra-thin heat exchange plate will not collapse during operation. A sintered fiber core 32 is laid along the length of the groove 311 to form a composite liquid-absorbing core structure 3. The cavity on the side of the fiber core 32 serves as an airflow channel 313. The sintered composite liquid-absorbing core 3 has good capillary performance, which makes up for the defect of insufficient working fluid circulation when the single grooved liquid-absorbing core 31 is working, so that the ultra-thin heat exchange plate has good heat dissipation capacity and meets the high-performance heat dissipation requirements.

[0045] (3) The heat spreader is a gas-liquid coplanar structure, and there is no need to set up another layer of air cavity based on the support column. Its airflow channel 313 is provided by the remaining part of the groove 311, which further reduces the thickness of the heat spreader.

[0046] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and this utility model also intends to include these modifications and variations.

Claims

1. A heat spreader for a blade battery, comprising a first substrate (1), a second substrate (2), and a composite wicking core (3), characterized in that: The first substrate (1) covers the second substrate (2) to form a sealed accommodating space, in which the composite liquid-absorbing core (3) and the working fluid are disposed; The composite liquid-absorbing core (3) includes a grooved liquid-absorbing core (31) and a fiber sintered core (32). The grooved liquid-absorbing core (31) has a groove (311), and the fiber sintered core (32) is laid on the groove (311) along the extension direction of the groove (311).

2. The heat spreader for blade batteries according to claim 1, characterized in that: The grooved liquid-absorbing core (31) has multiple grooves (311), and two adjacent grooves (311) are separated by a support column (312). The support column (312) faces the upper end surface of the first substrate (1) and abuts against the inner surface of the first substrate (1).

3. The heat spreader for a blade battery according to claim 2, characterized in that: The grooves (311) extend along the length of the groove suction core (31), and the extension directions of each groove (311) are parallel to each other.

4. The heat spreader for blade batteries according to claim 2, characterized in that: The cross-section of the support (312) is trapezoidal, and the width of the upper end away from the groove (311) is smaller than the width of its lower end.

5. The heat spreader for blade batteries according to claim 1, characterized in that: A plurality of airflow channels (313) are formed between the inner surface of the first substrate (1) facing the second substrate (2) and the groove (311). In the extension direction of the groove (311), the length of the groove liquid-absorbing core (31) is equal to the accommodating space, so that each airflow channel (313) is independent of each other.

6. The heat spreader for a blade battery according to claim 5, characterized in that: The upper end face of the fiber sintered core (32) abuts against the inner surface of the first substrate (1), and the airflow channel (313) is located on the side of the fiber sintered core (32).

7. The heat spreader for a blade battery according to claim 1, characterized in that: The working medium is deionized water, ethanol, or Freon.

8. The heat spreader for a blade battery according to claim 1, characterized in that: The inner surfaces of the first substrate (1) and the second substrate (2) and the outer surface of the composite liquid-absorbing core (3) are provided with passivation treatment layers.

9. The heat spreader for a blade battery according to claim 1, characterized in that: The first substrate (1) and the second substrate (2) are aluminum components.

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