A method for preparing a liquid cooling plate, the liquid cooling plate and a power battery

Abstract

This invention relates to the field of power battery technology and provides a method for preparing a liquid cooling plate, the liquid cooling plate itself, and a power battery. The method for preparing the liquid cooling plate includes the following steps: laying a composite material layer and an auxiliary material layer on a mold; wherein the composite material layer includes an impregnation medium and multiple layers of fiber prepreg, the impregnation medium being disposed in each layer of fiber prepreg; heating the composite material layer and the auxiliary material layer so that a first portion of the composite material layer fills the concave flow channel of the mold, forming a second plate structure with liquid flow channels; wherein the first portion is the part of the composite material layer corresponding to the position of the concave flow channel. This invention can ensure the normal installation of the battery cell module above the liquid cooling plate and ensure the cooling effect of the liquid cooling plate on the battery module.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power batteries, in particular to a preparation method of a liquid cooling plate, a liquid cooling plate and a power battery. BACKGROUND

[0002] With the rapid development of new energy vehicles, as the power source of new energy vehicles, power batteries have higher requirements for the strength and performance of the liquid cooling plate in the power battery. Among them, the power battery mainly includes a battery box, a battery cell module, a liquid cooling plate and a bottom guard plate. The battery cell module is installed inside the battery box, the liquid cooling plate is installed at the bottom of the battery box and is closely arranged with the battery cell module, and is used for cooling the battery cell module by heat exchange. The bottom guard plate is installed at the bottom of the liquid cooling plate and is used for protecting the liquid cooling plate.

[0003] In the related art, the liquid cooling plate mainly includes an upper plate and a lower plate made of a metal material, for example, a flat plate is used as the upper plate of the liquid cooling plate, the upper part of which is used to place the battery cell module, and the lower plate of the liquid cooling plate is usually formed by stamping another flat plate between the stamping machine and the stamping die, and the upper plate and the lower plate are fixed as an integral structure by welding.

[0004] However, since the liquid cooling plate is an integral structure formed by welding the upper plate and the lower plate, during the welding process, not only can the plate material of the liquid cooling plate be deformed, reducing the flatness of the upper plate of the liquid cooling plate and affecting the installation of the battery cell module, but also since the liquid cooling plate is made of a metal material, it is affected by changes in the external environment temperature, so that the liquid cooling plate and the external environment temperature are easily exchanged, thereby reducing the cooling effect on the battery cell module. SUMMARY

[0005] The problem solved by the present application is that the liquid cooling plate in the related art, which is an integral structure formed by welding the upper plate and the lower plate made of a metal material, can cause deformation of the upper plate of the liquid cooling plate, affecting the installation of the battery cell module and also affecting the cooling effect on the battery cell module.

[0006] To solve the above problems, in a first aspect, the present application provides a preparation method of a liquid cooling plate, the liquid cooling plate comprising a first plate structure and a second plate structure having a liquid flow channel, the preparation method of the liquid cooling plate comprising the following steps:

[0007] The composite material layer and the auxiliary material layer are laid on the mold; wherein the composite material layer comprises a infiltration medium and a plurality of layers of fiber prepreg, and the infiltration medium is arranged in each layer of fiber prepreg;

[0008] The composite material layer and the auxiliary material layer are heated, so that a first partial area of the composite material layer fills the inner concave flow channel part of the mold, and the second plate structure with the liquid flow channel is formed; wherein the first partial area is a part of the composite material layer corresponding to the position of the inner concave flow channel part.

[0009] Optionally, the laying of the composite material layer and the auxiliary material layer on the mold comprises:

[0010] Laying multiple layers of the fiber prepreg on the mold;

[0011] Increasing the thickness of the fiber prepreg at a second partial area and / or a third partial area of the composite material layer; wherein the second partial area includes an area for forming a liquid flow channel and a periphery of the liquid flow channel, and the third partial area includes an area for forming a circumferential edge of the liquid cooling plate and a connection with an outer battery box.

[0012] Optionally, the composite material layer further comprises a reinforcing layer, and the laying of the composite material layer and the auxiliary material layer on the mold further comprises:

[0013] Laying the reinforcing layer between at least part of the fiber prepregs of two adjacent layers.

[0014] Optionally, the laying of the composite material layer and the auxiliary material layer on the mold further comprises:

[0015] Before laying multiple layers of the fiber prepreg on the mold, a connecting piece is arranged on the mold;

[0016] Laying multiple layers of the fiber prepreg around the connecting piece on the mold.

[0017] Optionally, the first plate structure and the second plate structure are connected by a fastener; and / or, the circumferential edges of the first plate structure and the second plate structure are sealingly connected by a first gum.

[0018] Optionally, the laying of the composite material layer and the auxiliary material layer on the mold comprises:

[0019] During the laying of multiple layers of the fiber prepreg on the mold, the infiltration medium is uniformly distributed in each layer of fiber prepreg to form a lower plate preform;

[0020] Laying the auxiliary material layer and the first plate structure on the lower plate preform in sequence.

[0021] Optionally, the laying of the auxiliary material layer and the first plate structure on the lower plate preform in sequence comprises:

[0022] Laying an isolation layer and an expansion layer on the lower plate preform in sequence; wherein the auxiliary material layer comprises the isolation layer and the expansion layer;

[0023] Laying a film on the surface of the first plate structure;

[0024] Laying the first plate structure with the film on the expansion layer.

[0025] Optionally, the heating of the composite material layer and the auxiliary material layer so that the first partial area of the composite material layer fills the inner recessed flow channel part of the mold to form the second plate structure with the liquid flow channel comprises:

[0026] Mold pressing and heating of the composite material layer, the auxiliary material layer, and the first plate structure;

[0027] When the expansion layer is a first vacuum bag, the interior of the first vacuum bag is subjected to air inflation pressurization to extrude the composite material layer with the expansion force of the first vacuum bag so that the first partial area of the composite material layer is in close contact with the inner recessed flow channel part of the mold to form the second plate structure with the liquid flow channel, and the second plate structure and the first plate structure are solidified and formed into an integrated structure of the liquid cooling plate; or when the expansion layer is made of a material that can expand when heated, the expansion layer is heated to expand and deform to extrude the composite material layer with the expansion force of the expansion layer so that the first partial area of the composite material layer is in close contact with the inner recessed flow channel part of the mold to form the second plate structure with the liquid flow channel, and the second plate structure and the first plate structure are solidified and formed into an integrated structure of the liquid cooling plate; wherein the first partial area of the second plate structure in close contact with the inner recessed flow channel part is the liquid flow channel.

[0028] Optionally, the laying of the composite material layer and the auxiliary material layer on the mold comprises:

[0029] After the laying of the multiple layers of the fiber pre-impregnated material on the mold, the auxiliary material layer is laid on the multiple layers of the fiber pre-impregnated material.

[0030] Optionally, the heating of the composite material layer and the auxiliary material layer so that the first partial area of the composite material layer fills the inner recessed flow channel part of the mold to form the second plate structure with the liquid flow channel comprises:

[0031] After the auxiliary material layer is laid on the multi-layered fiber prepreg, a second vacuum bag is sleeved outside the multi-layered fiber prepreg, the auxiliary material layer and the mold, and vacuumizing operation is performed on the second vacuum bag, so that the multi-layered fiber prepreg is shaped under the negative pressure of the vacuumizing operation;

[0032] The infiltration medium is filled into the second vacuum bag until the infiltration medium uniformly infiltrates the fiber prepreg, so as to form a lower plate preform;

[0033] The mold and the lower plate preform on the mold are heated, so that the first partial area of the lower plate preform deforms and flows to fill the inner recessed runner part, so as to form the second plate structure;

[0034] The first plate structure and the second plate structure are sealed and connected by a second gum;

[0035] The first plate structure and the second plate structure after the sealing and connection are locked by a fastener, so as to form the liquid cooling plate.

[0036] Compared with the prior art, the liquid cooling plate with an integrated structure can be formed by the following preparation method: for example, composite material layers and auxiliary material layers are laid on the top surface of a mold, for example, a lower mold, in a set order, a first plate structure can be installed on the upper part of the auxiliary material layer, at this time, the auxiliary material layer can be between the composite material layers and the first plate structure; then, the composite material layers and the auxiliary material layers can be heated, so that the infiltration medium, for example, resin, in the composite material layers can physically cross-link and chemically react with the multi-layered fiber prepreg under high temperature conditions to form good combination, at the same time, a first partial area of the composite material layers corresponding to the position of the inner recessed runner part of the lower mold deforms under high temperature conditions to fill the inner recessed runner part of the lower mold, and a second plate structure with a liquid runner can be formed in the solidification stage after heating, wherein the first partial area of the composite material layers deforms to form the liquid runner; finally, the second plate structure prepared by using the composite material layers and the first plate structure can be formed into a liquid cooling plate with an integrated structure by a non-welding method, for example, solidification or cementation.

[0037] Since the auxiliary material layer can be between the composite material layers and the first plate structure, the flow of the infiltration medium in the fiber prepreg can be promoted by the auxiliary material layer, so that the infiltration medium can be more uniformly distributed in the entire fiber prepreg, so that the density of each area of the composite material layers is more uniform after forming, and the overall strength of the second plate structure is correspondingly improved, and the above-mentioned auxiliary material layer can also reduce the adhesion between the composite material layers, which is beneficial to the demolding operation of the second plate structure and the auxiliary material layer.

[0038] Since the first plate structure and the second plate structure made of the composite material layer can be connected into an integrated liquid cooling plate by curing or cementing without welding, the first plate structure above the second plate structure will not be deformed to ensure the normal installation of the battery cell module above the liquid cooling plate; and the second plate structure below is made of the composite material layer to effectively reduce heat exchange with the external environment by using the low thermal conductivity of the composite material layer, which can provide better insulation effect for the liquid cooling plate and the battery box, and accordingly ensure the cooling effect of the liquid cooling plate on the battery module.

[0039] Furthermore, the second plate structure made of the composite material layer has higher insulation and pressure resistance than the lower plate made of metal material in the prior art to reduce or even avoid the conduction of the battery cell module above the liquid cooling plate to adjacent other components in the case of abnormal leakage, and accordingly improve the safety of the power battery.

[0040] Finally, since the composite material layer includes multiple layers of fiber prepreg, the thickness of the second plate structure in the liquid cooling plate can be flexibly adjusted according to the design requirements of the power battery to prepare second plate structures of different thicknesses, and accordingly improve the application range of the liquid cooling plate.

[0041] In a second aspect, the application also provides a liquid cooling plate, which comprises a first plate structure and a second plate structure with a liquid flow channel, the second plate structure is prepared by a composite material layer, the composite material layer comprises a plurality of layers of fiber prepreg and a soaking medium, the soaking medium is arranged in each layer of fiber prepreg, and the first plate structure and the second plate structure are connected into an integrated structure.

[0042] Since the second plate structure of the liquid cooling plate is prepared by a composite material layer, and the first plate structure can be made of metal material, the two can be connected into an integrated liquid cooling plate by curing or cementing without welding, so that the first plate structure above the second plate structure will not be deformed to ensure the normal installation of the battery cell module above the liquid cooling plate; and the second plate structure below is made of the composite material layer to effectively reduce heat exchange with the external environment by using the low thermal conductivity of the composite material layer, which can provide better insulation effect for the liquid cooling plate and the battery box, and accordingly ensure the cooling effect of the liquid cooling plate on the battery module. And the second plate structure made of the composite material layer has higher insulation and pressure resistance than the lower plate made of metal material in the prior art to reduce or even avoid the conduction of the battery cell module above the liquid cooling plate to adjacent other components in the case of abnormal leakage, and accordingly improve the safety of the power battery.

[0043] Optionally, the second plate structure has a second partial region, a third partial region and a fourth partial region, the second partial region includes a region for forming a liquid flow channel and a periphery of the liquid flow channel, the third partial region includes a region for forming a circumferential edge of the liquid cooling plate and connecting with an outer battery box, the thickness of the second partial region and / or the third partial region is greater than that of the fourth partial region.

[0044] Optionally, the liquid cooling plate further includes a connecting piece, and the connecting piece is arranged on the second plate structure.

[0045] In a third aspect, the present application further provides a power battery, which comprises the liquid cooling plate as described above, and further comprises a battery box and a battery cell module, the battery cell module is installed in the interior of the battery box, and the liquid cooling plate is installed at the bottom of the battery box and connected with the battery cell module.

[0046] Since the power battery comprises the liquid cooling plate, the power battery has at least all the technical effects of the liquid cooling plate, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0047] Figure 1 It is a flowchart of the preparation method of the liquid cooling plate in the embodiment of the present application;

[0048] Figure 2 It is one of the explosion structure schematic diagrams of the mold, the liquid cooling plate and the auxiliary material corresponding to the preparation method in the embodiment of the present application;

[0049] Figure 3 It is an explosion structure schematic diagram of the mold and the composite material layer corresponding to the preparation method in the embodiment of the present application;

[0050] Figure 4 It is the second explosion structure schematic diagram of the mold, the liquid cooling plate and the auxiliary material corresponding to the preparation method in the embodiment of the present application;

[0051] Figure 5 It is one of the structure schematic diagrams of the second plate structure in the embodiment of the present application;

[0052] Figure 6 It is the second structure schematic diagram of the second plate structure in the embodiment of the present application;

[0053] Figure 7 It is a structure schematic diagram of the second plate structure and the connecting piece in the embodiment of the present application;

[0054] Figure 8 It is a structure schematic diagram of the connecting piece in the embodiment of the present application.

[0055] BRIEF DESCRIPTION OF DRAWINGS

[0056] 1 - mold; 11 - inner recessed runner portion; 2 - composite material layer; 21 - fiber prepreg; 22 - second partial area; 23 - third partial area; 3 - second plate structure; 31 - liquid runner; 4 - auxiliary material layer; 41 - separation layer; 42 - expansion layer; 43 - gas port; 5 - first plate structure; 6 - adhesive film; 7 - connecting member. DETAILED DESCRIPTION

[0057] In order to make the above objectives, features and advantages of the present application more obvious and easy to understand, specific embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0058] It should be noted that in the coordinate system XYZ provided herein, the right direction is represented by the positive direction of the X axis, the left direction is represented by the negative direction of the X axis, the front direction is represented by the positive direction of the Y axis, the rear direction is represented by the negative direction of the Y axis, the upward direction is represented by the positive direction of the Z axis, and the downward direction is represented by the negative direction of the Z axis. At the same time, it should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0059] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0060] In the description of the present application, the description of the terms "embodiment", "one embodiment" and "one implementation" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or implementation are included in at least one embodiment or implementation of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or implementation. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or implementations in a suitable manner.

[0061] To solve the above technical problems, in combination with Figure 1 As shown in the figure, the present application provides a preparation method of a liquid cooling plate, the liquid cooling plate comprising a first plate structure 5 and a second plate structure 3 having a liquid runner 31, the preparation method of the liquid cooling plate comprising the following steps:

[0062] S1, laying the composite material layer 2 and the auxiliary material layer 4 on the mold 1; wherein the composite material layer 2 comprises an impregnating medium and a plurality of fiber prepregs 21, and the impregnating medium is arranged in each of the fiber prepregs 21;

[0063] S2, heating the composite material layer 2 and the auxiliary material layer 4, so that a first partial area of the composite material layer 2 fills the inner recessed flow channel part 11 of the mold 1, and the second plate structure 3 with the liquid flow channel 31 is formed; wherein the first partial area corresponds to the position of the inner recessed flow channel part 11 in the composite material layer 2.

[0064] It should be noted that in the above step S1, the fiber prepregs 21 in the composite material layer 2 can be laid on the mold 1 first; and the impregnating medium in the composite material layer 2 is arranged in the fiber prepregs 21, and the sequence of laying the auxiliary material layer 4 on the mold 1 can be flexibly adjusted according to different processes, and the sequence is not specifically limited in the embodiment.

[0065] Wherein, the fiber prepregs 21 can include a plurality of unidirectional continuous fibers, which can be at least one of glass fibers, carbon fibers, etc., and the continuous fibers refer to long fibers whose axial length matches the size, such as length or width, of the finally formed second plate structure 3; or the fiber prepregs 21 can also be unidirectional tapes, fabrics, axial fabrics, etc., so the type of fiber prepregs 21 is not specifically limited. The thickness of a single layer of fiber prepregs 21 can be as low as 0.8 mm, and multiple layers of fiber prepregs 21 can be laid in a stacked manner.

[0066] The impregnating medium can be a single resin, such as at least one of an epoxy resin, a bismaleimide resin, etc.; or the impregnating medium can be an impregnating medium mixture, such as a mixture of resin and curing agent, and the resin and the curing agent need to be stored separately at room temperature in the early stage, and can be mixed according to a set ratio (such as 100:1-20) when used.

[0067] In step S2, since the impregnating medium is uniformly distributed in each of the fiber prepregs 21 in the composite material layer 2, the impregnating medium can make the entire composite material layer 2 and the auxiliary material layer 4 deform first and then solidify and set at a high temperature during the heating operation of the composite material layer 2 and the auxiliary material layer 4.

[0068] Under the high temperature condition, the first partial area of the composite material layer 2 deforms to fill the inner recessed flow channel part 11 opened at the top of the mold 1, so as to form the second plate structure 3 with the liquid flow channel 31. Wherein, when the composite material layer 2 is laid, the first partial area of the composite material layer 2 corresponds to the position of the inner recessed flow channel part 11, so that the second plate structure 3 after forming has the liquid flow channel 31 at the first partial area.

[0069] The second plate structure 3 and the first plate structure 5 can be connected in the following ways. First, the second plate structure 3 and the first plate structure 5 are integrally formed by curing, for example, in step S2 described above, the first plate structure 5 is laid on the upper part of the auxiliary material layer 4, so that the first plate structure 5 and the composite material layer 2 are integrally formed into a liquid cooling plate by curing under a process such as a mold pressing and heating process. Second, the second plate structure 3 is separately formed and then assembled with the first plate structure 5, for example, in step S2 described above, after the composite material layer 2 and the auxiliary material layer 4 are heated and cured, the second plate structure 3 with the liquid flow channel 31 is formed, and then the second plate structure 3 and the first plate structure 5 are connected by cementing into an integrally formed liquid cooling plate.

[0070] The integrally formed liquid cooling plate can be prepared in the following way. For example, the composite material layer 2 and the auxiliary material layer 4 are laid on the top surface of the mold 1, for example, the lower mold 1, in a predetermined order, and the first plate structure 5 can be laid on the upper part of the auxiliary material layer 4, at this time, the auxiliary material layer 4 can be located between the composite material layer 2 and the first plate structure 5; then the composite material layer 2 and the auxiliary material layer 4 can be heated, so that the impregnating medium, for example, the resin in the composite material layer 2 can physically cross-link and chemically react with the multi-layer fiber prepreg 21 under high temperature conditions to form a good combination, at the same time, the first part of the composite material layer 2 corresponding to the position of the inner recessed flow channel part 11 of the lower mold 1 deforms under high temperature conditions to fill the inner recessed flow channel part 11 of the lower mold 1, and the second plate structure 3 with the liquid flow channel 31 is formed after the heating and curing stage, wherein the first part of the composite material layer 2 deforms to form the liquid flow channel 31; finally, the second plate structure 3 prepared by the composite material layer and the first plate structure 5 can be connected by a non-welding method, for example, curing or cementing, to form an integrally formed liquid cooling plate.

[0071] Since the auxiliary material layer 4 can be located between the composite material layer 2 and the first plate structure 5, the flow of the impregnating medium in the fiber prepreg 21 can be promoted through the auxiliary material layer 4, so that the impregnating medium can be more uniformly distributed in the entire fiber prepreg 21, so that the density of each area of the composite material layer 2 after forming is more uniform, and the overall strength of the second plate structure 3 is correspondingly improved, and the above-mentioned auxiliary material layer 4 can also reduce the adhesion between the composite material layer 2, which is beneficial to the demolding operation of the second plate structure 3 and the auxiliary material layer.

[0072] Since the first plate structure 5 and the second plate structure 3 made of the composite material layer 2 can be connected into an integrated structure of the liquid cooling plate in a curing or cementing manner without welding, the first plate structure 5 above the second plate structure 3 will not be deformed to ensure the normal installation of the battery cell module above the liquid cooling plate; and the second plate structure 3 below is made of the composite material layer 2 to effectively reduce the heat exchange with the external environment by using the low thermal conductivity of the composite material layer 2, which can provide better heat preservation effect for the liquid cooling plate and the battery box, and accordingly ensure the cooling effect of the liquid cooling plate on the battery module.

[0073] Furthermore, the second plate structure 3 made of the composite material layer 2 has higher insulation and pressure resistance than the lower plate made of metal material in the prior art, so as to reduce or even avoid the conduction of the battery cell module above the liquid cooling plate to the adjacent other components in the case of abnormal leakage, and accordingly improve the safety of the power battery.

[0074] Finally, since the composite material layer 2 includes a plurality of fiber prepregs 21, the thickness of the second plate structure 3 in the liquid cooling plate can be flexibly adjusted according to the design requirements of the power battery, so as to prepare the second plate structure 3 with different thicknesses, and accordingly improve the application range of the liquid cooling plate.

[0075] In an embodiment of the present application, the laying of the composite material layer 2 and the auxiliary material layer 4 on the mold 1 comprises:

[0076] S11, laying a plurality of the fiber prepregs 21 on the mold 1;

[0077] S12, increasing the thickness of the fiber prepregs 21 at the second partial area 22 and / or the third partial area 23 of the composite material layer 2; wherein the second partial area 22 includes an area for forming the liquid flow channel 31 and the periphery of the liquid flow channel 31, and the third partial area 23 includes an area for forming the circumferential edge of the liquid cooling plate and connecting with the outer battery box.

[0078] It should be noted that in the above step S11, a plurality of fiber prepregs 21 can be laid on the top of the mold 1 in sequence, and the number of layers of fiber prepregs 21 can be laid on the mold 1 according to the design requirements of the power battery, so as to form a composite material layer 2 with a set thickness.

[0079] The second partial area 22 and the third partial area 23 of the composite material layer 2 are both areas that need to be reinforced in the second plate structure 3, so by increasing the thickness of the fiber prepregs 21 at the second partial area 22 and / or the third partial area 23 of the composite material layer 2 (see Figure 6At the second part area 22 and / or the third part area 23, increasing the thickness of the fiber prepreg 21 can effectively strengthen the mechanical strength of the composite layer 2, and accordingly prolong the service life of the liquid cooling plate.

[0080] In an embodiment of the present application, the composite layer 2 further comprises a reinforcing layer, and the laying of the composite layer 2 and the auxiliary material layer 4 on the mold 1 further comprises:

[0081] S13, laying the reinforcing layer between at least part of the adjacent two layers of fiber prepreg 21.

[0082] It should be noted that in the above step S13, by laying the reinforcing layer between at least part of the adjacent two layers of fiber prepreg 21, not only can the reinforcing layer serve as a substrate, which is conducive to the uniform distribution of the fiber prepreg 21 on the reinforcing layer, but also can improve the mechanical strength of the entire composite layer 2 and the second plate structure 3 prepared by the composite layer 2, and accordingly prolong the service life of the liquid cooling plate.

[0083] At least part of the adjacent two layers of fiber prepreg 21 means that the reinforcing layer can be laid between part of the adjacent two layers of fiber prepreg 21, or between each adjacent two layers of fiber prepreg 21, so the specific number of reinforcing layers can be flexibly selected according to the design requirements of the power battery, which is not limited here. The reinforcing layer can be a metal mesh, a metal plate, or other plate-shaped structures with certain strength.

[0084] In an embodiment of the present application, the laying of the composite layer 2 and the auxiliary material layer 4 on the mold 1 further comprises:

[0085] Before the laying of the plurality of layers of fiber prepreg 21 on the mold 1, S10, the connecting piece 7 is arranged on the mold 1;

[0086] S11, laying a plurality of layers of fiber prepreg 21 around the connecting piece 7 on the mold 1.

[0087] It should be noted that in the above step S10, the connecting piece 7 can be placed at the designed position of the mold 1 before the composite material layer 2 is laid, and then the multiple layers of the fiber prepreg 21 are laid around the connecting piece 7 on the mold 1, that is, the laying sequence of the connecting piece 7 and the fiber prepreg 21 is first and then, which can avoid the influence of the fiber prepreg 21 on the placement position of the connecting piece 7, so as to improve the accuracy of the position of the connecting piece 7 relative to the composite material layer. Moreover, the multiple layers of the fiber prepreg 21 are laid around the connecting piece 7, so that the fiber prepreg 21 has a certain contact with the connecting piece 7, and accordingly the integration tightness and stability of the fiber prepreg 21 with the connecting piece 7 after the fiber prepreg 21 is cured at high temperature to form the second plate structure are improved.

[0088] In combination with the above Figure 7 As shown in the figure, the number of the connecting piece 7 is at least one, and the installation position of the connecting piece 7 can also be designed in advance according to the use scene. For example, in the related art, the bottom guard plate of the power battery is installed on the frame of the battery box through fasteners, and in the embodiment, the connecting piece 7 is pre-buried in the composite material layer 2, and the second plate structure 3 formed by the connecting piece 7 constitutes an integral structure, so that the mounting hole of the bottom guard plate can be transferred from the frame of the battery box to the liquid cooling plate, thereby reducing the process of making holes on the frame of the battery box, and also weakening the influence of the strength reduction of the frame caused by the holes. Moreover, in the related art, the wireless charging receiving device for wireless charging of the electric vehicle is generally installed on the chassis of the vehicle, and an additional assembly port is usually required on the chassis during installation. Therefore, by using the liquid cooling plate in the embodiment, that is, integrating the connecting piece 7 in the second plate structure 3 of the liquid cooling plate, a platform can be provided for the installation of the wireless charging receiving device.

[0089] In an embodiment of the present application, the first plate structure 5 and the second plate structure 3 are connected by fasteners; and / or, the circumferential edges of the first plate structure 5 and the second plate structure 3 are sealed and connected by a first glue.

[0090] It should be noted that the liquid cooling plate generally has a liquid inlet and a liquid outlet communicating with the internal liquid flow channel 31, so that after the second plate structure 3 is formed, the auxiliary material layer 4 can be pulled out from the liquid inlet and the liquid outlet to separate the auxiliary material layer 4 from the second plate structure 3, thereby avoiding the auxiliary material layer 4 from hindering the liquid flow channel 31.

[0091] Subsequently, the second plate structure 3 after the separation of the auxiliary material layer 4 is connected with the first plate structure 5, if it is necessary to further improve the connection quality of the second plate structure 3 and the first plate structure 5, at this time, fasteners can be added in the fourth partial area of the first plate structure 5 and the second plate structure 3, so that the connection of the liquid cooling plate at the fourth partial area is more stable; and / or, the first gum such as structural glue is sealed and connected at the circumferential edge of the first plate structure 5 and the second plate structure 3, so that a liquid cooling plate with better circumferential sealing effect can be formed.

[0092] The fourth partial area can be an area that needs to be further strengthened after connection due to the thin thickness of the first plate structure 5 and the second plate structure 3, for example, it can be an area between the liquid flow channel 31 and the circumferential edge of the second plate structure 3, so the specific position of the fourth partial area can be determined according to the design requirements of the liquid cooling plate, which is not limited here.

[0093] The fastener can be a rivet, a bolt fastener, etc., and the first gum can be structural glue, sealant, etc., which are not limited here.

[0094] In an embodiment of the present application, as shown in Figure 2 and Figure 3 The process of laying the composite material layer 2 and the auxiliary material layer 4 on the mold 1 comprises:

[0095] During the process of laying the multiple layers of the fiber prepreg 21 on the mold 1, the infiltration medium is uniformly distributed on each layer of the fiber prepreg 21 to form a lower plate preform.

[0096] The auxiliary material layer 4 and the first plate structure 5 are sequentially laid on the lower plate preform.

[0097] It should be noted that the present embodiment is used to cure the second plate structure 3 and the first plate structure 5 into a liquid cooling plate with an integrated structure; specifically, the infiltration medium can be uniformly sprayed on each layer of the fiber prepreg 21 during the process of laying the multiple layers of the fiber prepreg 21 (see Figure 3 ) on the mold 1 to form a lower plate preform.

[0098] As shown in Figure 2 Subsequently, the auxiliary material layer 4 can be laid on the first partial area of the lower plate preform first, and then the first plate structure 5 is laid, at this time, the auxiliary material layer 4 is between the lower plate preform and the first plate structure 5, at this time, the auxiliary material layer 4 not only helps the infiltration medium to flow in the fiber prepreg 21, but also facilitates the demolding operation of the auxiliary material layer 4 from the lower plate preform.

[0099] In an embodiment of the present application, as shown in Figure 2 andFigure 4 sequentially laying the auxiliary material layer 4 and the first plate structure 5 on the lower plate preform comprises:

[0100] sequentially laying an isolation layer 41 and an expansion layer 42 on the lower plate preform; wherein the auxiliary material layer 4 comprises the isolation layer 41 and the expansion layer 42;

[0101] laying a glue film 6 on the surface of the first plate structure 5;

[0102] laying the first plate structure 5 with the glue film 6 on the expansion layer 42.

[0103] It should be noted that the auxiliary material layer 4 comprises the isolation layer 41 and the expansion layer 42, the isolation layer 41 can be laid on the lower plate preform first, and then the expansion layer 42 is laid on the upper part of the isolation layer 41, at this time the isolation layer 41 is between the lower plate preform and the expansion layer 42. Subsequently, the glue film 6 can be laid on the surface of the first plate structure 5, and finally the first plate structure 5 with the glue film 6 is laid on the expansion layer 42, at this time the glue film 6 is below the first plate structure 5 and covers the lower plate preform and the expansion layer 42, which can improve the connection and sealing between the lower plate preform and the first plate structure 5.

[0104] wherein the glue film 6 has upper and lower surfaces, for example, the upper surface of the glue film 6 can be tightly bonded with the first plate structure 5, and the lower surface of the glue film 6 can be used to be tightly bonded with the lower plate preform.

[0105] In an embodiment of the present application, the heating of the composite material layer 2 and the auxiliary material layer 4 makes the first part of the composite material layer 2 fill the inner recessed runner part 11 of the mold 1, forming the second plate structure 3 with the liquid runner 31 comprises:

[0106] molding and heating the composite material layer 2, the auxiliary material layer 4 and the first plate structure 5;

[0107] When the expansion layer 42 is a first vacuum bag, the interior of the first vacuum bag is inflated to press the composite material layer 2 by the expansion force of the first vacuum bag, so that the first part of the composite material layer 2 is in close contact with the inner recessed runner part 11 of the mold 1 to form the second plate structure 3 with the liquid runner 31, and the second plate structure 3 and the first plate structure 5 are cured and formed into an integrated structure of the liquid cooling plate; or, when the expansion layer 42 is made of a material that can expand when heated, the expansion layer 42 is heated to expand and deform, so as to press the composite material layer 2 by the expansion force of the expansion layer 42, so that the first part of the composite material layer 2 is in close contact with the inner recessed runner part 11 of the mold 1 to form the second plate structure 3 with the liquid runner 31, and the second plate structure 3 and the first plate structure 5 are cured and formed into an integrated structure of the liquid cooling plate; wherein the first part of the second plate structure 3 in close contact with the inner recessed runner part 11 is the liquid runner 31 (see Figure 5 ).

[0108] It should be noted that, as shown in Figure 2 , after the first plate structure 5 with the adhesive film 6 is laid on the expansion layer 42, the composite material layer 2 and the auxiliary material layer 4 can be pressed by a molding process, and the composite material layer 2 is heated in the molding process to solidify and shape.

[0109] In this embodiment, the expansion layer 42 can be a first vacuum bag, and the shapes and sizes of the expansion layer 42 and the isolation layer 41 can match those of the inner recessed runner part 11 on the mold 1 (see Figure 2 ). Figure 4 The first vacuum bag has two air ports 43 (see ), which can be connected by an air pump to inflate the interior of the first vacuum bag, and the first vacuum bag will expand and deform to press the composite material layer 2 through the isolation layer 41 by the expansion force of the first vacuum bag, so that the first part of the composite material layer 2 deforms downward to be in close contact with the inner recessed runner part 11 of the mold 1 to form the second plate structure 3 with the liquid runner 31, and at the same time, under the above high temperature condition, the composite material layer 2 or the composite material layer 2 through the circumferential edge of the adhesive film is physically crosslinked with the first plate structure 5, the bonding force is enhanced, and in the solidification stage after heating, the liquid cooling plate is formed into an integrated structure. And the two air ports 43 of the first vacuum bag can be used as the liquid inlet and outlet of the liquid cooling plate respectively, or as the outlet of the auxiliary material layer from the liquid cooling plate.

[0110] The difference between the embodiment and the above embodiment is that the expansion layer 42 in the embodiment is made of a material capable of expanding when heated, for example, the expansion layer 42 can be made of silica gel or other materials capable of expanding when heated, which is not limited here; and the shape and size of the expansion layer 42 and the isolation layer 41 can match the shape and size of the inner recessed runner part 11 on the mold 1. When laying the expansion layer 42, two openings are also reserved. The expansion layer 42 can deform and expand when heated, so as to use the expansion force of the expansion layer 42 to extrude the composite material layer 2 through the isolation layer 41, so that the first part of the composite material layer 2 deforms downward to tightly contact the inner recessed runner part 11 of the mold 1, so as to form the second plate structure 3 with the liquid runner 31. At the same time, under the above high temperature condition, the composite material layer 2 or the composite material layer 2 through the circumferential edge of the adhesive film is physically crosslinked with the first plate structure 5, the bonding force is enhanced, and the liquid cooling plate is formed as an integral structure in the solidification stage after heating. The external force in step S2 refers to the expansion force of the expansion layer 42 when deforming and expanding under heating and applied to the composite material layer 2.

[0111] In addition, the two openings reserved when laying the expansion layer 42 can be used as the liquid inlet and outlet of the liquid cooling plate in the subsequent process, and can also be used as the outlets of the isolation layer 41 and the expansion layer 42 pulled out from the two openings of the liquid cooling plate.

[0112] In an embodiment of the present application, the laying of the composite material layer 2 and the auxiliary material layer 4 on the mold 1 comprises:

[0113] After the laying of the plurality of fiber prepregs 21 on the mold 1, the auxiliary material layer 4 is laid on the plurality of fiber prepregs 21.

[0114] It should be noted that the embodiment is used for separately forming the second plate structure 3. Specifically, after the laying of the plurality of fiber prepregs 21 on the mold 1, the auxiliary material layer 4 can be directly laid on the plurality of fiber prepregs 21, and in this process, the corresponding press machine of the mold pressing process is not required, so as to correspondingly reduce the preparation cost and improve the preparation efficiency.

[0115] In an embodiment of the present application, the heating of the composite material layer 2 and the auxiliary material layer 4, so that the first part of the composite material layer 2 fills the inner recessed runner part 11 of the mold 1, to form the second plate structure 3 with the liquid runner 31 comprises:

[0116] After the auxiliary material layer 4 is laid on the multi-layered fiber prepreg 21, a second vacuum bag is sleeved outside the multi-layered fiber prepreg 21, the auxiliary material layer 4 and the mold 1, and vacuumizing operation is performed on the second vacuum bag, so that the multi-layered fiber prepreg 21 is shaped under the negative pressure of the vacuumizing operation;

[0117] The infiltration medium is filled into the second vacuum bag until the infiltration medium uniformly infiltrates the fiber prepreg 21, so as to form a lower plate preform.

[0118] The mold 1 and the lower plate preform on the mold 1 are heated, so that the first partial area of the lower plate preform deforms and flows to fill the inner recessed runner part 11, so as to form the second plate structure 3.

[0119] The first plate structure 5 and the second plate structure 3 are sealed and connected by a second glue.

[0120] The first plate structure 5 and the second plate structure 3 after the sealing and connection are locked by a fastener, so as to form the liquid cooling plate.

[0121] It should be noted that the second vacuum bag can be sleeved outside the multi-layered fiber prepreg 21, the auxiliary material layer 4 and the mold 1 at the same time, so that the fiber prepreg 21 is more closely contacted with the top surface of the mold under the negative pressure of the vacuumizing operation of the second vacuum bag in the later stage, so that the fiber prepreg 21 deforms to approach the shape of the second plate structure 3.

[0122] The second lower plate structure can be prepared separately by using a transfer molding process. For example, after the auxiliary material layer 4 is laid on the multi-layered fiber prepreg 21, a second vacuum bag can be sleeved outside the multi-layered fiber prepreg 21 and the auxiliary material layer 4, and at this time, a vacuumizing device can be communicated with the second vacuum bag to perform vacuumizing operation on the inside of the second vacuum bag, so that the multi-layered fiber prepreg 21 is shaped under the negative pressure of the vacuumizing operation. In this process, since the shape of the auxiliary material layer 4 matches the shape of the inner recessed runner part 11 of the mold 1, the auxiliary material layer 4 also deforms synchronously with the first partial area of the composite material layer 2.

[0123] Then, the infiltration medium can be filled into the second vacuum bag through a conduit, and when the infiltration medium sufficiently infiltrates the fiber prepreg 21, the supply of the infiltration medium can be cut off, so that the fiber prepreg 21 and the infiltration medium form a lower plate preform.

[0124] Then the mold 1 and the lower plate preform and the auxiliary material layer 4 on the mold 1 can be placed in an oven and heated for a set time to make the lower plate preform and the auxiliary material layer 4 perform a heating operation. Under high temperature conditions, the first part of the lower plate preform deforms (i.e., assumes a fluid state) and flows to fill the inner concave flow channel part 11, so that the shape of the lower plate preform matches the second plate structure 3 more closely. After solidification and molding, the second vacuum bag and the auxiliary material layer 4 are removed to form an independently molded second plate structure 3.

[0125] Of course, in addition to the introduction molding process used in the present embodiment to form the second lower plate structure, other processes can also be used to separately prepare the second lower plate structure, such as the RTM process (RTM is a process in which resin is injected into a closed mold to impregnate the reinforcing material and solidify), the HPRTM process (HPRTM is a high-pressure resin transfer molding process, which refers to a process in which resin is mixed and injected into a vacuum-sealed mold pre-paved with fiber pre-impregnated material and pre-embedded inserts using high-pressure pressure, and then resin flows to fill the mold, impregnates, solidifies, and demolds to obtain a composite product), the PCM process (the PCM process can be roughly divided into cold mold laying, heating, curing, holding, and demolding), and the like.

[0126] After the above-mentioned separately molded second plate structure 3, the circumferential part of the first plate structure 5 and the second plate structure 3 can be sealed and connected using a second adhesive to improve the sealing effect.

[0127] Subsequently, fasteners can be added to the circumferential edge of the first plate structure 5 and the second plate structure 3 after sealing and connecting to form a liquid cooling plate, so that the fasteners can increase the stability of the connection between the first plate structure 5 and the second plate structure 3 at the circumferential edge, further preventing loosening of the connection between the first plate structure 5 and the second plate structure 3.

[0128] The second adhesive can be a sealant, a structural adhesive, or the like.

[0129] Another embodiment of the present application provides a liquid cooling plate, which can be prepared using the preparation method of the liquid cooling plate described in the above embodiments. The liquid cooling plate includes a first plate structure 5 and a second plate structure 3 having a liquid flow channel 31, the second plate structure 3 is prepared using a composite material layer 2, the composite material layer 2 includes an impregnating medium and a plurality of layers of fiber pre-impregnated material 21, the impregnating medium is arranged in each layer of fiber pre-impregnated material 21, and the first plate structure 5 and the second plate structure 3 are connected as an integral structure.

[0130] It should be noted that the first plate structure 5 can be a flat plate structure of a metal material, and the second plate structure 3 can be a second plate structure 3 with a liquid flow channel 31 formed by the composite material layer 2 described above, and the first plate structure 5 can be above the second plate structure 3, so the first plate structure 5 can be equivalent to the upper plate in the prior art.

[0131] Since the first plate structure 5 and the second plate structure 3 are connected into an integrated structure, the mechanical strength of the entire liquid cooling plate can be improved, the service life is prolonged, and the installation convenience with other components such as the battery box is also improved.

[0132] In an embodiment of the present application, the second plate structure 3 has a second partial area 22, a third partial area 23, and a fourth partial area, the second partial area 22 includes an area for forming the liquid flow channel 31 and the periphery of the liquid flow channel 31, the third partial area 23 includes an area for forming the circumferential edge of the liquid cooling plate and connecting with the outer battery box, the thickness of the second partial area 22 and / or the third partial area 23 is greater than that of the fourth partial area.

[0133] It should be noted that the area of the entire second plate structure 3 outside the second partial area 22 and the third partial area 23 is defined as the fourth partial area, and the second partial area 22 and the third partial area 23 are areas with relatively thick thickness in the second plate structure 3, and the fourth partial area is an area with relatively thin thickness in the second plate structure 3, so the thickness of the second partial area 22 and / or the third partial area 23 is greater than that of the fourth partial area.

[0134] In an embodiment of the present application, in combination with Figure 7 and Figure 8 As shown, the liquid cooling plate further includes a connecting piece 7, and the connecting piece 7 is arranged on the second plate structure 3.

[0135] It should be noted that at least one connecting piece 7 can be integrally arranged in the second plate structure 3, so that the connecting piece 7 can provide a mounting basis for other accessories, for example, the mounting hole of the bottom guard plate in the power battery in the prior art can be transferred to the frame of the battery box on the liquid cooling plate, in other words, the bottom guard plate can be mounted on the bottom of the liquid cooling plate by fastening the connecting piece 7 of the bottom guard plate and the liquid cooling plate, effectively reducing the hole making process of the frame of the battery box, and weakening the influence of the strength reduction of the frame caused by hole making. Furthermore, the automobile wireless charging receiving device mounted on the automobile chassis in the prior art can be replaced and mounted on the liquid cooling plate by fastening, thereby effectively improving the installation flexibility of other accessories.

[0136] The connecting piece 7 described above can be a nut structure with internal threads, and can also be other connecting pieces with internal threads, which are not specifically limited here.

[0137] In combination Figure 7 As shown in the second plate structure 3 of the liquid cooling plate, the plurality of connecting pieces 7 are integrated and installed, further improving the stability of installation with other accessories.

[0138] Another embodiment of the present application provides a power battery, comprising the liquid cooling plate as described above, further comprising a battery box and a battery cell module, the battery cell module is installed in the interior of the battery box, the liquid cooling plate is installed at the bottom of the battery box and connected with the battery cell module.

[0139] It should be noted that the battery cell module can be installed in the interior of the battery box, and the liquid cooling plate is installed at the bottom of the battery box, which means that the liquid cooling plate can be directly installed below the bottom plate of the battery box, so that the liquid cooling plate is in contact and connected with the battery cell module through the bottom plate of the battery box, or the liquid cooling plate can be connected with the side wall of the battery box to serve as the bottom plate of the battery box, at this time the liquid cooling plate can be directly in contact and connected with the battery cell module. The power battery has all the technical effects of the above-mentioned liquid cooling plate, which will not be repeated here.

[0140] In this embodiment, the liquid cooling plate and the power battery can be applied to electric vehicles, and can also be applied to energy storage systems.

[0141] Although the present application is disclosed as above, the protection scope of the present application is not limited to this. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, and these changes and modifications will fall within the protection scope of the present application.

Claims

1. A method for preparing a liquid-cooled plate, characterized in that, The liquid cooling plate comprises a first plate structure (5) and a second plate structure (3) with a liquid flow channel (31), and a preparation method of the liquid cooling plate comprises the following steps: The composite material layer (2) and the auxiliary material layer (4) are laid on the mold (1), wherein the composite material layer (2) comprises an infiltration medium and a plurality of layers of fiber prepreg (21), and the infiltration medium is arranged in each layer of fiber prepreg (21); the laying of the composite material layer (2) and the auxiliary material layer (4) on the mold (1) comprises: laying a plurality of layers of the fiber prepreg (21) on the mold (1); during the laying of the plurality of layers of the fiber prepreg (21) on the mold (1), the infiltration medium is uniformly distributed in each layer of fiber prepreg (21) to form a lower plate preform; the auxiliary material layer (4) and the first plate structure (5) are sequentially laid on the lower plate preform. The sequentially laying of the auxiliary material layer (4) and the first plate structure (5) on the lower plate preform comprises: sequentially laying a separation layer (41) and an expansion layer (42) on the lower plate preform; the auxiliary material layer (4) comprises the separation layer (41) and the expansion layer (42); a glue film (6) is laid on the surface of the first plate structure (5); the first plate structure (5) with the glue film (6) is laid on the expansion layer (42); the auxiliary material layer (4) not only makes the infiltration medium more uniformly distributed in the entire fiber prepreg (21), but also reduces the adhesion between the composite material layer (2) and the auxiliary material layer (4). The composite material layer (2) and the auxiliary material layer (4) are heated, so that a first partial region of the composite material layer (2) fills the inner concave flow channel part (11) of the mold (1) to form the second plate structure (3) with the liquid flow channel (31); the first partial region is a part of the composite material layer (2) corresponding to the position of the inner concave flow channel part (11).

2. The method of producing a liquid cooling plate according to claim 1, wherein The laying of the composite material layer (2) and the auxiliary material layer (4) on the mold (1) further comprises: The thickness of the fiber prepreg (21) is increased at a second partial region (22) and / or a third partial region (23) of the composite material layer (2); the second partial region (22) comprises a region for forming a liquid flow channel (31) and a periphery of the liquid flow channel (31), and the third partial region (23) comprises a region for forming a circumferential edge of the liquid cooling plate and a connection with an outer battery box.

3. The method of claim 2, wherein the liquid cooling plate is prepared by the steps of: The composite material layer (2) further comprises a reinforcing layer, and the laying of the composite material layer (2) and the auxiliary material layer (4) on the mold (1) further comprises: The reinforcing layer is laid between at least part of two adjacent layers of the fiber prepreg (21).

4. The method of claim 2, wherein the liquid cooling plate is prepared by the steps of: The laying of the composite material layer (2) and the auxiliary material layer (4) on the mold (1) further comprises: Before the laying of the plurality of layers of the fiber prepreg (21) on the mold (1), a connecting piece (7) is arranged on the mold (1); The multiple layers of the fiber prepreg (21) are laid around the connecting member (7) on the mold (1).

5. The method of claim 2, wherein the liquid cooling plate is prepared by the steps of: The first plate structure (5) and the second plate structure (3) are connected by fasteners; and / or, the circumferential edges of the first plate structure (5) and the second plate structure (3) are sealedly connected by a first gum.

6. The method of producing a liquid cooling plate according to any one of claims 2 to 5, characterized in that, The heating of the composite material layer (2) and the auxiliary material layer (4) makes the first partial area of the composite material layer (2) fill the inner recessed flow channel part (11) of the mold (1), forming the second plate structure (3) with the liquid flow channel (31) includes: The composite material layer (2), the auxiliary material layer (4) and the first plate structure (5) are subjected to a molding and heating operation; When the expansion layer (42) is a first vacuum bag, the interior of the first vacuum bag is subjected to an air pressure boosting operation to use the expansion force of the first vacuum bag to press the composite material layer (2), so that the first partial area of the composite material layer (2) is in close contact with the inner recessed flow channel part (11) of the mold (1), to form the second plate structure (3) with the liquid flow channel (31), and the second plate structure (3) and the first plate structure (5) are integrally formed into the liquid cooling plate; or, when the expansion layer (42) is made of a material that can expand when heated, the expansion layer (42) is heated to expand and deform to press the composite material layer (2) using the expansion force of the expansion layer (42), so that the first partial area of the composite material layer (2) is in close contact with the inner recessed flow channel part (11) of the mold (1), to form the second plate structure (3) with the liquid flow channel (31), and the second plate structure (3) and the first plate structure (5) are integrally formed into the liquid cooling plate; wherein the first partial area of the second plate structure (3) in close contact with the inner recessed flow channel part (11) is the liquid flow channel (31).

7. The method of producing a liquid cooling plate according to any one of claims 2 to 5, wherein The laying of the composite material layer (2) and the auxiliary material layer (4) on the mold (1) includes: After the laying of the multiple layers of the fiber prepreg (21) on the mold (1), the auxiliary material layer (4) is laid on the multiple layers of the fiber prepreg (21).

8. A liquid cooling plate produced by the method according to any one of claims 1 to 7, characterized by, The liquid cooling plate includes a first plate structure (5) and a second plate structure (3) with a liquid flow channel (31), the second plate structure (3) is formed by a composite material layer (2), the composite material layer (2) includes an infiltration medium and multiple layers of fiber prepreg (21), the infiltration medium is arranged in each layer of fiber prepreg (21), and the first plate structure (5) and the second plate structure (3) are connected into an integral structure.

9. The liquid cold plate of claim 8, wherein, The second plate structure (3) has a second partial region (22), a third partial region (23), and a fourth partial region, the second partial region (22) includes a region for forming a liquid flow channel (31) and a periphery of the liquid flow channel (31), the third partial region (23) includes a region for forming a circumferential edge of the liquid cooling plate and connecting with an outer battery box, the thickness of the second partial region (22) and / or the third partial region (23) is greater than that of the fourth partial region.

10. The liquid cold plate of claim 8, wherein, The liquid cooling plate further comprises a connecting piece (7) arranged on the second plate structure (3).

11. A power cell, characterized by The liquid cooling plate as claimed in any one of claims 8 to 10, further comprising a battery box and a battery cell module, the battery cell module is installed inside the battery box, the liquid cooling plate is installed at the bottom of the battery box and connected with the battery cell module.

Images