Extruded liquid cooling plate structure and power battery pack thereof

Abstract

According to the extruded liquid cooling plate structure and the power battery pack thereof provided by the utility model, the extruded liquid cooling plate body is internally of a hollow structure, and the extruded liquid cooling plate structure can be completed by utilizing the arrangement of the separation ribs, the flow channel inlet, the flow channel outlet and the two end plates, so that the process is simple, the manufacturing cost is low, and the production efficiency is high. Meanwhile, the temperature equalizing plate is light in weight and high in mechanical strength, can be arranged at the position close to the center of a power battery to achieve a better temperature equalizing effect when being combined with a power battery pack, and can be arranged on a side plate to be used as a structural plate through the characteristic of high mechanical strength of the temperature equalizing plate.

Description

Technical Field

[0001] The utility model relates to a liquid cooling plate structure, in particular to an extruded liquid cooling plate structure which adopts an extrusion molding method and can further provide structural strength and a power battery pack thereof. Background Art

[0002] In response to the booming new energy vehicle market, power batteries are one of the three core technologies of new energy electric vehicles. The structural protection design of power batteries and their thermal management planning are considered to be a very important part of new energy electric vehicles. At the same time, in order to improve the endurance of new energy electric vehicles, lightweight demand is an inevitable trend.

[0003] Furthermore, due to the limited space in the vehicle body, the power batteries will be placed quite densely to maximize their capacity. However, due to the dense configuration, the temperature in the middle area of ​​the power battery pack will be higher than that in the edge area. If there is no proper cooling device, the battery power will decrease after long-term use. In more serious cases, it may even cause thermal runaway, threatening the driving safety of new energy electric vehicles.

[0004] The current mainstream thermal management method uses liquid cooling, that is, using a liquid cooling plate as a cooling mechanism. The larger heat exchange coefficient generated by the flow of liquid has become the most efficient heat dissipation method. In order to further improve the energy density of power battery packs, the assembly process has tended to CTP (Cell to Pack; module-free power battery pack), and even further developed towards CTB (Cell to Body; battery body integration technology) and CTC (Cell to Chassis; battery chassis integration). In addition, the increase in the length of the battery cell makes the temperature difference between the center and the edge of the assembled power battery worse.

[0005] However, existing liquid cooling plates have limited cooling performance and are generally designed to match the size of the battery pack. Therefore, as the number of battery packs increases, the size and weight of the liquid cooling plate also increase, which will reduce the energy density and endurance of the battery pack. In addition, the structural strength of existing liquid cooling plates is low and can only be used for heat conduction and heat dissipation, and cannot play a role in fixing the battery structure.

[0006] Based on the above deficiencies of the prior art, the utility model proposes an extruded liquid cooling plate structure and a power battery pack thereof to effectively solve the above problems. Utility Model Content

[0007] The main purpose of the utility model is to provide an extruded liquid cooling plate structure and a power battery pack thereof, which can not only reduce the size and weight, but also have structural strength and can further serve as a fixed battery structure.

[0008] The utility model provides an extruded liquid cooling plate structure, comprising:

[0009] An extruded liquid cooling plate body, which is provided with a flow channel inlet and a flow channel outlet, the liquid cooling plate body is a semi-enclosed hollow structure with openings at both ends and a partition rib inside, so that the hollow structure is formed into a first partition area, a second partition area and a non-partition area, the flow channel inlet is connected to the first partition area, and the flow channel outlet is connected to the second partition area; and

[0010] Two end plates are arranged at two ends of the liquid cooling plate body to close the openings at two ends of the hollow structure.

[0011] Preferably, the liquid cooling plate body further comprises at least one flow channel rib, which is arranged in the first partition area and / or the second partition area to form a plurality of independent channels in the first partition area and / or the second partition area.

[0012] Preferably, the liquid cooling plate body further includes two frame ribs and at least one fixing kit, the two frame ribs are respectively arranged on both sides of the liquid cooling plate body, the fixing kit includes a fixing hole and a fixing member, the fixing hole is arranged between the edge of the liquid cooling plate body and the frame rib, the fixing member passes through the fixing hole to fix the liquid cooling plate body to a device to be cooled.

[0013] Preferably, the fixing hole has a top opening and a bottom opening, the fixing part has a fixed head and a fixed tail, the size of the fixed head is larger than the size of the fixed tail, the top opening is not smaller than the size of the fixed head, and the bottom opening is smaller than the size of the fixed head.

[0014] Preferably, the two frame ribs are side walls of the hollow structure.

[0015] Preferably, the liquid cooling plate body extends a plurality of heat conducting fins toward the hollow structure.

[0016] Preferably, the heat conducting fins are arranged in different sizes or densities in different areas of the liquid cooling plate body.

[0017] The utility model also provides a power battery pack, which is characterized by being provided with the extruded liquid cooling plate structure as described above.

[0018] Preferably, the extruded liquid cooling plate structure is arranged across the power battery pack.

[0019] Preferably, the power battery pack comprises a plurality of the extruded liquid cooling plate structures of different sizes, wherein a larger extruded liquid cooling plate structure is disposed near the center of the power battery pack.

[0020] On the other hand, when the extruded liquid cooling plate structure of the present invention is applied to a power battery pack, the power battery pack is provided with the aforementioned extruded liquid cooling plate structure as a cooling mechanism for the power battery pack, and can be installed, for example, across the middle of the power battery pack to directly cool down the relatively high temperature portion, or directly used as a side plate of the power battery pack. In addition to the cooling effect, it can also serve as a supporting structure for the power battery pack due to its higher structural strength.

[0021] The following detailed description is made through specific embodiments, so that the purpose, technical content, characteristics and effects achieved by the present invention can be more easily understood. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the exploded structure of the extruded liquid cooling plate of the utility model.

[0023] Figure 2 It is a schematic diagram of the structure of the extruded liquid cooling plate of the utility model.

[0024] Figure 3 It is a schematic diagram of another embodiment of the extruded liquid cooling plate structure of the utility model.

[0025] Figure 4 It is a schematic diagram of the flow channel of another embodiment of the extruded liquid cooling plate structure of the utility model.

[0026] Figure 5 It is a schematic diagram of the cooperation between the fixing holes and the fixing parts of the extruded liquid cooling plate structure of the utility model.

[0027] Figure 6 The schematic diagram of the extruded liquid cooling plate structure of the utility model is additionally provided with heat conducting fins.

[0028] Figure 7 This is a schematic diagram of the extruded liquid cooling plate structure of the utility model applied to a power battery pack.

[0029] Figure 8 It is a schematic diagram of another embodiment of the extruded liquid cooling plate structure of the utility model applied to a power battery pack.

[0030] Fig. 9 It is a schematic diagram of another embodiment of the extruded liquid cooling plate structure of the utility model applied to a power battery pack.

[0031] Fig.10 It is a schematic diagram of another embodiment of the extruded liquid cooling plate structure of the utility model applied to a power battery pack.

[0032] Fig.11 It is a schematic diagram of another embodiment of the extruded liquid cooling plate structure of the utility model applied to a power battery pack.

[0033] Reference numerals

[0034] 1 Extruded Liquid Cooling Plate Structure

[0035] 10 Liquid cooling plate body

[0036] 101 First compartment

[0037] 1011 Channel

[0038] 102 Second compartment

[0039] 1021 Channel

[0040] 103 Border area

[0041] 104 Border area

[0042] 105 No partition

[0043] 11 Separator Ribs

[0044] 111 runner rib

[0045] 112 runner ribs

[0046] 12 Frame ribs

[0047] 13 Frame ribs

[0048] 21 End plate

[0049] 22 End plate

[0050] 31 Flow channel inlet

[0051] 32 Flow channel outlet

[0052] 41 Fixing holes

[0053] 42 Fixing parts

[0054] 421 Fixed Head

[0055] 422 Fixed tail

[0056] 61 Inlet casing

[0057] 62 outlet casing

[0058] 71 Thermal fins

[0059] 80 Power battery pack DETAILED DESCRIPTION

[0060] In order to make the advantages, spirit and features of the present invention easier to understand, the following will be described and discussed in detail with reference to the embodiments and drawings. It should be stated that these embodiments are only representative embodiments of the present invention, and the implementation and protection scope of the present invention are not limited to these embodiments. The purpose of providing these embodiments is only to make the disclosure of the present invention more thorough and easy to understand.

[0061] The terms used in the various embodiments disclosed in the present invention are only used for the purpose of describing specific embodiments, and are not intended to limit the various embodiments disclosed in the present invention. Unless otherwise clearly indicated, the singular form used also includes the plural form. Unless otherwise specified, all terms (including technical terms and scientific terms) used in this specification have the same meanings as those commonly understood by ordinary technicians in the field to which the various embodiments disclosed in the present invention belong. The above terms (such as those defined in a generally used dictionary) will be interpreted as having the same meaning as the contextual meaning in the same technical field, and will not be interpreted as having an idealized meaning or an overly formal meaning, unless clearly defined in the various embodiments disclosed in the present invention.

[0062] In the description of this specification, the reference to the terms "an embodiment", "a specific embodiment", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment are included in at least one embodiment of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments in a suitable manner.

[0063] In the description of the present invention, unless otherwise specified or limited, it should be noted that the terms "coupling", "connection" and "setting" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection of two components, it can be a direct connection, or it can be connected through an intermediate medium. For those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0064] The extruded liquid cooling plate structure disclosed in the present invention can be found in Figure 1 , Figure 2The extruded liquid cooling plate structure 1 includes an extruded liquid cooling plate body 10 and two end plates 21, 22. The liquid cooling plate body 10 is provided with a flow channel inlet 31 and a flow channel outlet 32. The liquid cooling plate body 10 is an extruded part, which is formed by extrusion to form a semi-enclosed hollow structure with openings at only two ends. The liquid cooling plate body 10 has a partition rib 11 inside, which divides the internal hollow structure into a first partition area 101, a second partition area 102 and an unpartitioned area 105. As shown in the figure, the first partition area 101 and the second partition area 102 are located on both sides of the partition rib 11, and the partition rib 11 can be cut off at the end of the partition rib 11 (close to the end plate 21) by post-processing to form the unpartitioned area 105. Therefore, the first partition area 101 will be connected to the unpartitioned area 105, and the unpartitioned area 105 will be connected to the second partition area 102, and the flow channel inlet 31 is connected to the first partition area 101, and the flow channel outlet 32 ​​is connected to the second partition area 102.

[0065] Two end plates 21 and 22 are disposed at both ends of the liquid cooling plate body 10 to close the openings at both ends of the liquid cooling plate body 10, thereby forming a flow channel that penetrates and can guide the coolant to enter and flow out of the liquid cooling plate body 10, that is, the area flowing along the first partition 101, the non-partitioned area 105, and the second partition 102. The flow channel inlet 31 and the flow channel outlet 32 ​​are opened on the top surface of the liquid cooling plate body 10 by post-processing, and the flow channel inlet 31 and the flow channel outlet 32 ​​are respectively connected to the first partition 101 and the second partition 102 inside the liquid cooling plate body 10, so as to guide the coolant to enter and flow out of the liquid cooling plate body 10. The liquid cooling plate body 10 is made of a material with high thermal conductivity. At the same time, it needs to meet the requirements of lightness when applied to power batteries, and conform to the extrusion molding process to make it have higher strength. Therefore, aluminum is preferred (but not limited) as the material.

[0066] As shown in the figure, the liquid cooling plate body 10 also includes two frame ribs 12 and 13, which are respectively arranged on both sides of the adjacent liquid cooling plate body 10 and extend inside the entire liquid cooling plate body 10, thereby separating the flow channel area located in the center composed of the first partition area 101, the non-partition area 105, and the second partition area 102 and the two frame areas 103 and 104 located at the edges to prevent the coolant from overflowing to the frame areas 103 and 104. In other words, the frame ribs 12 and 13 serve as the side walls of the hollow structure where the first partition area 101, the non-partition area 105, and the second partition area 102 are located; on the other hand, the coolant can be easily guided to the first partition area 101 of the liquid cooling plate body 10 and the coolant can be guided out of the second partition area 102 of the liquid cooling plate body 10 by connecting the inlet sleeve 61 to the flow channel inlet 31 and the outlet sleeve 62 to the flow channel outlet 32.

[0067] On the other hand, see Figure 3 , Figure 4 The liquid cooling plate body 10 may further include at least one flow channel rib 111, 112, which are respectively arranged in the first partition area 101 and the second partition area 102, so that the flow channel rib 111 forms a plurality of independent channels 1011 in the first partition area 101, and the flow channel rib 112 forms a plurality of independent channels 1021 in the second partition area 102, so as to form a plurality of flow channel systems, such as Figure 4 As shown, the first partition area 101 and the second partition area 102 respectively have three flow channel ribs 111, 112 to form four groups of channels 1011, 1021 in the first partition area 101 and the second partition area 102 respectively to increase the overall heat dissipation efficiency; of course, the number and configuration positions of the flow channel ribs 111, 112 and the channels 1011, 1021 can be changed or adjusted according to needs, and the present invention is not limited to the state shown in the figure.

[0068] Please also refer to Figure 1 , 4, 5. The liquid cooling plate body 10 further includes at least one set of fixing kits, the fixing kits including fixing holes 41 and fixing parts 42, the fixing holes 41 are arranged in the frame areas 103 and 104 of the liquid cooling plate body 10, thereby fixing the extruded liquid cooling plate structure 1 to the device to be cooled; the fixing holes 41 are opened between the edge of the liquid cooling plate body 10 and the frame ribs 12 and 13, that is, located in the frame areas 103 and 104. Since the frame areas 103 and 104 are completely isolated from the hollow structure where the first partition area 101, the non-partitioned area 105, and the second partition area 102 are located, the opened fixing holes 41 will not affect the coolant flowing in the hollow structure, so that the coolant will not overflow or leak. Furthermore, the fixing hole 41 penetrates the liquid cooling plate body 10, and the fixing hole 41 has a top opening and a bottom opening, the top opening is larger than the bottom opening, and the fixing member 42 has a fixing head 421 and a fixing tail 422, the size of the fixing head 421 is larger than the size of the fixing tail 422, the size of the top opening is not smaller than the size of the fixing head 421, and the size of the bottom opening is smaller than the size of the fixing head 421. In this way, when the fixing member 42 passes through the fixing hole 41, the fixing head 421 of the fixing member 42 can just pass through the top surface of the liquid cooling plate body 10, but will not pass through the bottom surface of the liquid cooling plate body 10, while the fixing tail 422 can pass through the bottom surface of the liquid cooling plate body 10. In this way, when the fixing member 42 is used to fix the liquid cooling plate body 10, the force can be applied only to the bottom surface of the liquid cooling plate body 10, but not to the top surface of the liquid cooling plate body 10, thereby avoiding extrusion during fixing and damaging the structure of the liquid cooling plate body 10. At the same time, the size of the fixed head 421 of the fixing member 42 is not larger than the size from the frame ribs 12, 13 to the edge, that is, the size of the frame areas 103, 104. The fixed head 421 passing through the fixing hole 41 will be at least partially accommodated in the hollow area of ​​the frame areas 103, 104, and the bottom end of the fixed tail 422 is exposed and protrudes outside the bottom end of the fixing hole 41 to lock the liquid cooling plate body 10 with the device to be cooled. Through the above-mentioned component position relationship, the bottom surface of the fixed head 421 will directly stop at the bottom plate of the liquid cooling plate body in the middle frame area of ​​the frame areas 103, 104, and the bottom plate will bear the stress applied by the fixing member 42 when it is locked, so as to avoid the deformation of the frame areas 103, 104 with hollow interiors when the fixing member 42 is directly locked and applied to the top plate of the liquid cooling plate body 10. Furthermore, when the two long axis side walls of the liquid cooling plate body 10 are squeezed by external stress, the fixed head 421 contained in the hollow area of ​​the frame area 103, 104 can also be used as a structural reinforcement component to provide appropriate resistance. The fixing member 42 can be a screw, a bolt or a rivet, etc., and can also have different shapes, patterns and types.

[0069] On the other hand, see Figure 6, the liquid cooling plate body 10 can be provided with heat conducting fins 71 toward the inside of the hollow structure. The heat conducting fins 71 can extend from the liquid cooling plate body 10 (top surface or bottom surface), the partition ribs 11, the flow channel ribs 111, 112, or the frame ribs 12, 13 toward the internal space of the channels 1011, 1021. In this way, the surface area available for heat conduction can be greatly increased, that is, the contact area between the coolant and the liquid cooling plate body 10 is increased, thereby greatly improving the cooling effect. It is particularly noted here that because the liquid cooling plate body 10 is an extruded part, the heat conducting fins 71 can be formed simultaneously during the extrusion process, and the size of the heat conducting fins 71 can be quite fine. At the same time, the thermal fins 71 can be configured only in a partial area of ​​the liquid cooling plate body 10, or thermal fins 71 of different sizes or densities can be configured in different areas of the liquid cooling plate body 10. For example, the thermal fins 71 can be configured only in the area of ​​the channel 1021, or the thermal fins 71 can be configured in different channels with different sizes or densities of thermal fins 71 according to the different needs of each area; for example, channel 1011 and channel 1021 can be configured with thermal fins 71 of different sizes or densities.

[0070] Please refer to Figure 7 The extruded liquid cooling plate structure 1 of the utility model can be used as a cooling mechanism for the power battery pack 80. The extruded liquid cooling plate structure 1 is connected to the fixing member 42 (see Figure 5 ) structure to be installed on the power battery pack 80 and span across the top surface of the power battery pack 80, not only providing cooling, but also because the main structure of the extruded liquid cooling plate structure 1 is an extruded piece, its structural strength is much higher than that of the liquid cooling plate in the prior art. Therefore, it can also be used as a structural plate to provide support for the top surface of the power battery pack 80. As shown in the figure, it is combined with two groups of extruded liquid cooling plate structures 1, which can be increased to three groups as needed, such as Figure 8 As shown, the extruded liquid cooling plate structure 1 can also be arranged near the center of the power battery pack 80 (where the temperature is higher) to achieve the best heat dissipation effect and temperature uniformity; of course, the width of the extruded liquid cooling plate structure 1 can also be adjusted to match the power battery pack 80, such as Fig. 9 As shown, in order to be applied to the angular battery module, the extruded liquid cooling plate structure 1 is widened to increase the contact area and the heat dissipation efficiency. Moreover, one extruded liquid cooling plate structure 1 corresponds to a row of angular batteries, which can make the temperature of the entire row of batteries better. In response to the higher temperature near the center of the power battery pack 80, in order to achieve a more efficient cooling effect, Fig.10As shown, the power battery pack 80 may include a plurality of extruded liquid cooling plate structures 1 of different sizes, wherein a larger extruded liquid cooling plate structure 1 is disposed near the center of the power battery pack 80, and a smaller extruded liquid cooling plate structure 1 is disposed on both sides of the larger extruded liquid cooling plate structure 1. On the other hand, the extruded liquid cooling plate structure 1 may also be disposed on the side of the power battery pack 80, such as Fig.11 As shown, the extruded liquid cooling plate structure 1 is directly used as the side plate of the power battery pack 80. Similarly, the extruded liquid cooling plate structure 1 can also be arranged on any side surface or multiple side surfaces of the power battery pack 80.

[0071] In summary, the utility model proposes an extruded liquid cooling plate structure and a power battery pack thereof, which utilizes an extruded part as the main structure of the liquid cooling plate, which can not only provide cooling and heat dissipation effects, but can also be used as a structural plate through its high structural strength, thereby achieving both structural strength, light weight, and optimal heat dissipation effects and temperature uniformity.

[0072] The above is only a preferred embodiment of the utility model and is not intended to limit the scope of implementation of the utility model. The protection scope of the utility model is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the utility model within the essence and protection scope of the utility model, and such modifications or equivalent substitutions should also be deemed to fall within the protection scope of the utility model.

Claims

1. An extruded liquid cooling plate structure, characterized in that: Contains: An extruded liquid cooling plate body, which is provided with a flow channel inlet and a flow channel outlet, the liquid cooling plate body is a semi-enclosed hollow structure with openings at both ends and a partition rib inside, so that the hollow structure is formed into a first partition area, a second partition area and a non-partition area, the flow channel inlet is connected to the first partition area, and the flow channel outlet is connected to the second partition area; and Two end plates are arranged at two ends of the liquid cooling plate body to close the openings at two ends of the hollow structure.

2. The extruded liquid cooling plate structure according to claim 1, characterized in that: The liquid cooling plate body further includes at least one flow channel rib, which is arranged in the first partition area and / or the second partition area to form a plurality of independent channels in the first partition area and / or the second partition area.

3. The extruded liquid cooling plate structure according to claim 1, characterized in that: The liquid cooling plate body also includes two frame ribs and at least one fixing kit, the two frame ribs are respectively arranged on both sides of the liquid cooling plate body, the fixing kit includes a fixing hole and a fixing piece, the fixing hole is arranged between the edge of the liquid cooling plate body and the frame rib, the fixing piece passes through the fixing hole to fix the liquid cooling plate body to a device to be cooled.

4. The extruded liquid cooling plate structure according to claim 3, characterized in that: The fixing hole has a top opening and a bottom opening, the fixing piece has a fixing head and a fixing tail, the size of the fixing head is larger than the size of the fixing tail, the top opening is not smaller than the size of the fixing head, and the bottom opening is smaller than the size of the fixing head.

5. The extruded liquid cooling plate structure according to claim 3, characterized in that: The two frame ribs are the side walls of the hollow structure.

6. The extruded liquid cooling plate structure according to claim 1, characterized in that: A plurality of heat conducting fins are extended from the liquid cooling plate body toward the hollow structure.

7. The extruded liquid cooling plate structure according to claim 6, characterized in that: The heat conducting fins are configured with different sizes or densities in different areas of the liquid cooling plate body.

8. A power battery pack, characterized in that An extruded liquid cooling plate structure as claimed in claim 1 is provided.

9. The power battery pack according to claim 8, characterized in that: The extruded liquid cooling plate structure is arranged across the power battery pack.

10. The power battery pack according to claim 9, characterized in that: The power battery pack includes a plurality of extruded liquid cooling plate structures of different sizes, wherein a larger extruded liquid cooling plate structure is arranged near the center of the power battery pack.

Images