Runner plate, liquid cooling plate and battery pack

Abstract

The utility model provides a runner plate, a liquid cooling plate and a battery pack, and belongs to the technical field of secondary batteries. The runner plate comprises a base plate and a runner, and the runner is arranged on the base plate. The base plate comprises two flow channel disc arrangement areas, and each flow channel disc arrangement area is provided with a flow channel in a disc mode. The flow channel disc arrangement area is provided with a liquid inlet corresponding area and a liquid outlet corresponding area, the liquid inlet corresponding area is used for arranging a liquid inlet or directly facing the liquid inlet, the liquid outlet corresponding area is used for arranging a liquid outlet or directly facing the liquid outlet, and cooling liquid passes through the edge of the base plate and then passes through the middle of the base plate in the process of flowing from the liquid inlet to the liquid outlet through the flow channel. According to the arrangement mode, the length of the flow channel of each flow channel disc arrangement area can be shortened, so that the circulating speed of the cooling liquid in the liquid cooling plate is increased, and the heat exchange effect of the cooling liquid is improved. The edge area and the central area of the battery pack have a certain temperature difference, so that the flowing path of the cooling liquid can perform effective heat exchange on each area of the battery pack, and the temperature difference of each area of the battery pack after heat exchange is relatively small.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of secondary battery technology, and specifically to a flow channel plate, a liquid cooling plate, and a battery pack. Background Art

[0002] The battery pack is a crucial device for energy storage and conversion in electric vehicles. Multiple battery modules form a battery pack. Battery modules have significantly different operating efficiencies at different temperatures, so battery packs are equipped with a thermal management system to ensure the modules operate at optimal temperatures.

[0003] Common thermal management systems include a liquid cooling plate installed at the bottom of the battery module. However, the flow channel design in existing liquid cooling plates makes it difficult to maintain a relatively uniform temperature across multiple battery modules, hindering thermal management of the battery pack and negatively impacting its proper operation. Utility Model Content

[0004] The present application provides a flow channel plate, a liquid cooling plate and a battery pack, which can maintain a relatively uniform temperature in the heat dissipation area of the battery pack.

[0005] In a first aspect, the present application provides a flow channel plate comprising a substrate and flow channels, wherein the flow channels are disposed on the substrate. The substrate includes two flow channel disc areas, each of which is provided with flow channels. The flow channel disc areas are provided with a liquid inlet and a liquid outlet communicating with the flow channels. As the coolant flows from the liquid inlet through the flow channels to the liquid outlet, it first passes through the edge of the substrate and then through the center of the substrate.

[0006] The above solution, by providing two flow channel disks, shortens the length of each flow channel, thereby shortening the coolant's flow distance and flow time in each flow channel. This speeds up the coolant's circulation within the liquid cold plate, thereby enhancing the coolant's heat exchange effectiveness. Under high or low temperature operating conditions, a certain temperature difference exists between the edge and center areas of the battery pack, enabling the coolant's flow path to effectively exchange heat with all areas of the battery pack. The temperature difference between the various areas of the battery pack after heat exchange is minimal, maintaining a relatively uniform temperature across the heat dissipation areas of the battery pack. This facilitates thermal management of the battery pack, enabling the battery pack to operate normally at an appropriate temperature.

[0007] In one possible design, the flow channel disk includes a first region and a second region, each corresponding to a different battery module. The first region disk is provided with a first flow channel, and the second region disk is provided with a second flow channel. The first flow channel and the second flow channel are interconnected so that the first flow channel and the second flow channel share a common liquid inlet and / or liquid outlet.

[0008] Through the above solution, compared to a single flow channel, the interconnected first and second flow channels each have a shorter flow channel length, which shortens the flow distance and flow time of the coolant in the first or second flow channel, thereby accelerating the circulation speed of the coolant in the flow channel, thereby improving the heat exchange effect of the coolant, and thus achieving a better heat exchange effect for the battery pack. The arrangement of the first and second flow channels sharing a liquid inlet and / or liquid outlet can reduce the number of liquid inlets and / or liquid outlets and the corresponding flow paths, thereby simplifying the structure of the flow channel and facilitating thermal management of the battery pack.

[0009] In a possible design, the first flow channel and the second flow channel have two communication locations, and the two communication locations are respectively close to the liquid inlet and the liquid outlet.

[0010] Through the above scheme, the connection position near the liquid inlet can quickly divert the coolant flowing in through the liquid inlet to the first flow channel and the second flow channel. At this time, the temperature of the coolant is closer to the initial temperature of the coolant when it flows in from the liquid inlet. Therefore, the temperature of the coolant diverted to the first flow channel and the second flow channel is basically the same, and the cooling effect on different battery modules is also relatively close, reducing the difference in the cooling degree of different battery modules and reducing the temperature difference between different battery modules. The connection position near the liquid outlet can make the coolant in the first flow channel and the second flow channel merge when it is about to flow out of the liquid cold plate, so as not to affect the cooling effect of the coolant in the first flow channel and the second flow channel on the battery modules in their respective corresponding areas, reducing the difference in the cooling degree of different battery modules and reducing the temperature difference between different battery modules.

[0011] In a possible design, the two flow channel disk areas are symmetrically arranged in a side-by-side direction.

[0012] Through the above solution, the two symmetrically arranged flow channel disk areas make the lengths of the flow channels in the two flow channel disk areas basically the same, and the sizes of the areas that can be cooled by the two flow channel disk areas are also basically the same, so that the temperature of the coolant from flowing in to flowing out of the two flow channel disk areas is also basically the same. Therefore, the battery modules corresponding to the two flow channel disk areas can be cooled to the same extent relatively synchronously, that is, different areas of the battery pack can perform heat exchange synchronously, which is beneficial to the thermal management of the battery pack.

[0013] In a possible design, at least a portion of the first flow channel includes a plurality of first branch flow channels, and the plurality of first branch flow channels are arranged side by side in a direction perpendicular to the flow direction of the coolant and are interconnected.

[0014] Through the above scheme, multiple first branch flow channels can, on the one hand, increase the cross-sectional area of the flow channel and reduce the flow resistance of the coolant in the first flow channel, so as to speed up the flow rate of the coolant and improve the heat exchange effect of the coolant; on the other hand, it can increase the number of flow paths of the coolant in the flow direction within the first flow channel, avoiding the problem of blockage of a single flow path during the ball hitting test or use of the liquid cooling plate, so that the coolant can still flow normally in the first flow channel under harsh use conditions, thereby improving the safety performance and reliability of the flow channel plate.

[0015] In a possible design, at least a partial area of the second flow channel includes a plurality of second branch flow channels, and the plurality of second branch flow channels are arranged side by side in a direction perpendicular to the flow direction of the coolant and are interconnected.

[0016] Through the above scheme, multiple second branch flow channels can, on the one hand, increase the cross-sectional area of the flow channel and reduce the flow resistance of the coolant in the second flow channel, so as to speed up the flow rate of the coolant and improve the heat exchange effect of the coolant. On the other hand, the number of flow paths of the coolant in the flow direction within the second flow channel can be increased, thereby avoiding the problem of blockage of a single flow path during the ball hitting test or use of the liquid cooling plate, so that the coolant can still flow normally in the second flow channel under harsh use conditions, thereby improving the safety performance and reliability of the flow channel plate.

[0017] In a possible design, a spoiler is provided at the bend of the flow channel.

[0018] Through this solution, the spoiler can preemptively divert the coolant flow when the designed flow direction of the runner changes, ensuring a more orderly and controllable flow of coolant within the runner. Furthermore, the spoiler prevents large amounts of coolant from concentrating on the bends of the runners, potentially damaging these bends after prolonged use. This ensures the runner plate operates stably, extending its service life and improving its reliability.

[0019] In a second aspect, the present application provides a liquid cooling plate comprising a housing and a flow channel plate. The flow channel plate comprises a base plate and a flow channel disposed on the base plate. The housing is connected to the base plate, and a chamber for the flow of cooling liquid is formed between the housing and the sidewalls of the flow channel.

[0020] Through the above solution, the shell and flow channel plate together form the liquid cooling plate. The shell not only protects the flow channel plate to reduce the impact of the external environment on the flow channel plate, but also, through cooperation with the flow channel, forms a chamber inside the liquid cooling plate for the coolant to flow. The base plate not only provides a mounting platform for the flow channel, but also protects the flow channel, reducing the impact of the external environment on the flow channel, thereby ensuring the normal operation of the liquid cooling plate.

[0021] In one possible design, the liquid cooling plate further includes a plurality of water pipe joints, which are arranged on the side of the shell away from the flow channel plate and are connected to the flow channel, and the corresponding areas of the liquid inlet and the liquid outlet are respectively arranged opposite to a water pipe joint.

[0022] Through the above solution, the main function of the water pipe joint is to realize the entry and exit of the coolant in the liquid cooling plate, so that the coolant can flow normally in the liquid cooling plate, thereby making the liquid cooling plate have a better heat exchange effect, and thus enabling the battery pack to work normally at an appropriate temperature.

[0023] The beneficial effects of the liquid cooling plate provided in the second aspect and each possible design of the second aspect can be referred to the beneficial effects brought about by the first aspect and each possible implementation method of the first aspect, and will not be repeated here.

[0024] In a third aspect, the present application provides a battery pack, comprising a battery module and a liquid cooling plate, wherein the liquid cooling plate is connected to one side of the battery module.

[0025] The beneficial effects of the battery pack provided in the third aspect and each possible design of the third aspect can be referred to the beneficial effects brought about by the second aspect and each possible implementation method of the second aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of an explosion of a liquid cooling plate provided in an embodiment of the present application.

[0027] Figure 2 A schematic structural diagram of a flow channel plate provided in an embodiment of the present application.

[0028] Figure 3 for Figure 2 A locally enlarged schematic diagram of position A in the middle.

[0029] Figure 4 A schematic structural diagram of another flow channel plate provided in an embodiment of the present application.

[0030] Figure 5 A schematic structural diagram of a flow channel plate arrangement area provided in an embodiment of the present application.

[0031] Figure 6 A schematic structural diagram of a first region provided in an embodiment of the present application.

[0032] Figure 7 A schematic structural diagram of a second region provided in an embodiment of the present application.

[0033] Figure identification: 1. Flow channel plate; 11. Base plate; 111. Flow channel plate area; 1111. Liquid inlet corresponding area; 1112. Liquid outlet corresponding area; 1113. First area; 1114. Second area; 12. Flow channel; 121. First flow channel; 1211. First branch flow channel; 122. Second flow channel; 1221. Second branch flow channel; 123. Spoiler; 2. Liquid cooling plate; 21. Shell; 211. Liquid inlet; 212. Liquid outlet; 22. Water pipe joint. DETAILED DESCRIPTION

[0034] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification, claims and drawings of this application are intended to cover non-exclusive inclusions.

[0036] References to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase "embodiment" in various places in the specification does not necessarily refer to the same embodiment, nor does it necessarily refer to independent or alternative embodiments that are mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0037] The term "and / or" in this document simply describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists, A and B exist, and B exists. Additionally, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0038] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the current limiting module of the present application. For example, in the description of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present application.

[0039] In addition, the terms "first", "second", etc. in the description and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order, and may explicitly or implicitly include one or more such features.

[0040] In the description of this application, unless otherwise specified, "plurality" means more than two (including two), and similarly, "multiple groups" means more than two (including two).

[0041] In the description of this application, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly. For example, "connected" or "connected" in a mechanical structure can refer to a physical connection. For example, a physical connection can be a fixed connection, such as a fixed connection via a barrier, such as a screw, bolt, or other barrier. A physical connection can also be a removable connection, such as a snap-fit connection. A physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances. "Connected" or "connected" in a circuit structure can refer not only to a physical connection, but also to an electrical connection or a signal connection. For example, it can be a direct connection, i.e., a physical connection, or an indirect connection through at least one intermediate component, as long as circuit connectivity is achieved. It can also refer to internal communication between two components. A signal connection can refer not only to signal connection through an electrical circuit, but also to signal connection through a media medium, such as radio waves. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0042] The present application provides a battery pack (not shown in the figure), including a battery module (not shown in the figure) and a liquid cooling plate, wherein the liquid cooling plate is connected to one side of the battery module.

[0043] A battery pack is an energy storage device that integrates multiple battery modules and a thermal management system. It is used to provide power to various electrical devices. The thermal management system includes a liquid cooling plate, which is primarily used to control the operating temperature of the battery pack.

[0044] A battery module is composed of multiple battery cells connected in series or parallel to form a unit with a certain voltage and capacity.

[0045] Liquid cold plates transfer and dissipate heat through the coolant flowing through them. The coolant has a high specific heat capacity and good thermal conductivity, enabling better heat exchange between the coolant and the battery module, thus improving the heat exchange effect of the battery pack using liquid cold plates.

[0046] One side of the battery module can be any side of the battery module, specifically the side of the battery module away from the pole. The side of the battery module with the pole requires complex circuit connections, making it inconvenient to install a liquid cooling plate. Placing the liquid cooling plate on the side of the battery module away from the pole avoids the circuit connection structure between the pole and the battery module, preventing the liquid cooling plate from affecting or interfering with the electrical connections between the battery modules within the battery pack. Furthermore, the larger area on the side of the battery module away from the pole increases the effective contact area between the liquid cooling plate and the bottom of the battery module, thereby achieving better heat exchange and ensuring normal operation of the battery pack.

[0047] The connection between the battery module and the liquid cooling plate is achieved using a thermally conductive structural adhesive, primarily composed of a resin matrix and thermally conductive insulating fillers. This adhesive not only creates a stable connection between the battery module and the liquid cooling plate, but also ensures excellent thermal conductivity and insulation between the battery module and the liquid cooling plate, enabling the battery pack to operate normally at an appropriate temperature.

[0048] The following is a detailed introduction to the specific structure of the liquid cooling plate.

[0049] Figure 1 This is a schematic diagram of an explosion of a liquid cooling plate provided in an embodiment of the present application. Figure 2 A schematic structural diagram of a flow channel plate provided in an embodiment of the present application.

[0050] like Figure 1 and Figure 2 As shown, the present application provides a liquid cooling plate 2, comprising a housing 21 and a flow channel plate 1. The flow channel plate 1 comprises a base plate 11 and a flow channel 12 disposed on the base plate 11. The housing 21 is connected to the base plate 11, and a chamber for the flow of cooling liquid is formed between the housing 21 and the sidewall of the flow channel 12.

[0051] The shell 21 and the flow channel plate 1 together constitute the liquid cooling plate 2. The shell 21 not only provides protection for the flow channel plate 1 to reduce the impact of the external environment on the flow channel plate 1, but also can cooperate with the flow channel 12 to form a chamber inside the liquid cooling plate 2 for the flow of coolant.

[0052] The flow channel 12 is a recessed structure provided on the substrate 11. Depending on the shape of the recessed structure, the flow channel 12 can have different shapes. For example, the flow channel 12 can be coiled in an S-shape, or the flow channel 12 can be arranged in a circle with a gradually decreasing circumference from the edge of the substrate 11 to the center. Different flow channel branches can also be formed and arranged in different areas of the substrate 11. Depending on the position of the consecutive recessed structures, the coolant can be guided to flow along a specific path within the flow channel 12.

[0053] It should be noted that there are flow channel areas on the substrate 11, and there must also be non-flow channel areas, wherein the non-flow channel areas are areas on the substrate other than the flow channel 12, which can be non-recessed structures or convex structures on the substrate 11. The non-flow channel areas can be set between different sections of the flow channel 12 to isolate the flow channel 12. Although the non-flow channel areas do not contact the coolant when the coolant flows in the flow channel 12, the heat in this area can be transferred to the coolant through the side walls of the flow channel 12, thereby causing relatively uniform cooling at various locations on the substrate 11, and further reducing the temperature of various parts of the liquid cooling plate 2. When the liquid cooling plate 2 is used in a battery pack, the battery modules at various locations close to the liquid cooling plate 2 can be cooled relatively evenly through heat exchange with the liquid cooling plate 2.

[0054] In an optional embodiment, the flow channel plate 1 can be formed by stamping, metal injection molding, powder metallurgy, etc., so as to simplify the connection structure and processing steps of the flow channel plate 1, thereby improving the production and processing efficiency of the liquid cooling plate 2.

[0055] The connection between the housing 21 and the flow channel plate 1 can be achieved through welding, clamping, gluing, or other methods. Specifically, the housing 21 is connected to the side of the flow channel 12 of the flow channel 12, so that a chamber for coolant flow is formed within the liquid cooling plate 2 between the sidewalls of the housing 21 and the flow channel 12. This allows the liquid cooling plate 2 to achieve better heat dissipation performance through the flow of coolant, thereby enabling the battery pack to operate normally at an appropriate operating temperature. The specific structure of the flow channel plate 1 will be described in detail below and will not be elaborated here.

[0056] Figure 3 for Figure 2 A locally enlarged schematic diagram of position A in the middle.

[0057] Alternatively, as Figure 1 、 Figure 2 and Figure 3As shown, the liquid cooling plate 2 further includes a plurality of water pipe joints 22 , and a liquid inlet 211 and a liquid outlet 212 are provided on the shell. The water pipe joints 22 are provided on the side of the shell 21 away from the flow channel plate 1 , and the liquid inlet 211 and the liquid outlet 212 are respectively connected to one water pipe joint 22 .

[0058] The main function of the water pipe joint 22 is to realize the entry and exit of the coolant in the liquid cooling plate 2, so that the coolant can flow normally in the liquid cooling plate 2, thereby making the liquid cooling plate 2 have a better heat exchange effect, and thus making the battery pack able to work normally at an appropriate temperature.

[0059] The location of the water pipe joint 22 allows the coolant to enter and exit the liquid cooling plate 2 through the water pipe joint 22 , while avoiding direct contact between the water pipe joint 22 and the flow channel 12 , thereby facilitating the installation of the water pipe joint 22 .

[0060] Specifically, the number of water pipe joints 22 is at least 2, of which at least one is used for liquid inlet and one is used for liquid outlet. Accordingly, the total number of liquid inlets and liquid outlets should also be the same as the number of water pipe joints, that is, the liquid inlet 211 and the liquid outlet 212 of the liquid cooling plate 2 need to be provided with water pipe joints 22, so that the coolant can form a complete circulation loop between the liquid cooling plate 2 and the external environment through the water pipe joints 22.

[0061] The connection method between the water pipe joint 22 and the liquid inlet 211 and the liquid outlet 212 can be a threaded connection, a clamp connection, etc. The above connection method needs to ensure good sealing to avoid leakage of the coolant while forming a stable connection between the water pipe joint 22 and the liquid inlet 211, and the water pipe joint 22 and the liquid outlet 212.

[0062] It is understandable that the liquid inlet 211 and the liquid outlet 212 can also be provided on the substrate 11 and communicate with the flow channel 12, with the water pipe connector 22 provided on the side of the substrate 11 facing away from the housing 21. In this case, the corresponding relationship and installation structure of the water pipe connector 22 and the liquid inlet 211 and the liquid outlet 212 are the same or similar to those in the first case, and are not specifically described in this embodiment of the present application.

[0063] Figure 4 A schematic structural diagram of another flow channel plate provided in an embodiment of the present application.

[0064] See Figures 1 to 4The present application also provides a flow channel plate 1, which includes a substrate 11 and a flow channel 12, and the flow channel 12 is provided on the substrate 11. The substrate 11 includes two flow channel disc areas 111, and each flow channel disc area 111 is provided with a flow channel 12. The flow channel disc area 111 is provided with a liquid inlet corresponding area 1111 and a liquid outlet corresponding area 1112. The liquid inlet corresponding area 1111 is used to set the liquid inlet or to be set directly opposite the liquid inlet, and the liquid outlet corresponding area 1112 is used to set the liquid outlet or to be set directly opposite the liquid outlet. In the process of the coolant flowing from the liquid inlet 211 through the flow channel 12 to the liquid outlet 212, the coolant first passes through the edge of the substrate 11 and then passes through the middle of the substrate 11.

[0065] Compared to a single flow channel, the provision of two flow channel disk areas 111 shortens the length of the flow channel 12 within each flow channel disk area 111, thereby shortening the coolant flow distance and flow time in each flow channel 12. This speeds up the coolant's circulation within the liquid cooling plate 2, thereby improving the coolant's heat exchange efficiency. This arrangement not only enhances the heat exchange efficiency of the liquid cooling plate 2, but also makes it easier to adjust the heat exchange efficiency of the liquid cooling plate 2 by controlling the flow of coolant, thereby facilitating thermal management of the battery pack.

[0066] In actual applications, the liquid inlet 211 and the liquid outlet 212 need to be used in conjunction with the water pipe joint 22. By setting the water pipe joint 22 at the liquid inlet 211 and the liquid outlet 212, the coolant can flow into the liquid inlet 211 or out of the liquid outlet 212 through the water pipe joint 22.

[0067] After the coolant enters the flow channel 12 from the liquid inlet 211, it first passes through the edge of the substrate 11, then passes through the middle of the substrate 11, and then flows out through the liquid outlet 212. This setting can be specifically achieved by setting the shape of the flow channel 12. For example, the flow channel 12 is set to a shape that gradually winds from the edge of the flow channel plate 12 to the middle from the liquid inlet corresponding area 1111 to the liquid outlet corresponding area 1112, so that the flow path of the coolant in the flow channel 12 is to first pass through the flow channel area at the edge of the substrate 11, and then pass through the flow channel area in the middle of the substrate 11.

[0068] In actual production applications, due to different external application environments, the working status of the battery pack can be roughly divided into two situations:

[0069] Under high-temperature operating conditions, the battery pack generates a significant amount of heat, causing the entire pack temperature to exceed the ambient temperature. The edges of the battery pack are in greater contact with the outside environment, allowing for better heat exchange between them. However, the center of the battery pack is relatively sealed, resulting in poorer heat exchange between the middle and the outside environment. Consequently, the temperature in the middle of the battery pack is higher than that at the edges.

[0070] When cooling the battery pack, the coolant flowing in through the liquid inlet 211 is initially at a relatively low temperature. As it passes the edge of the substrate 11, the coolant experiences a relatively low temperature rise due to the relatively low temperature at the edge of the battery pack. As the coolant continues to flow along the flow channel, the coolant, with a relatively low temperature rise, can still effectively cool the center of the battery pack, due to the higher temperature in the middle of the battery pack. The higher temperature coolant then flows out through the liquid outlet 212. Ultimately, both the center and edge of the battery pack are effectively cooled, and the temperature difference between the various regions of the battery pack is relatively small.

[0071] Under low-temperature operating conditions, the entire battery pack is affected by the ambient temperature, resulting in a lower temperature. The edge of the battery pack is more exposed to the outside environment, resulting in a more pronounced heat exchange effect between the edge and the surrounding environment. However, the center of the battery pack is relatively sealed, resulting in less effective heat exchange between the middle and the surrounding environment. Therefore, the temperature in the middle of the battery pack is higher than that at the edge.

[0072] Under operating conditions where the battery pack needs to be heated, the coolant flowing in from the liquid inlet 211 has a relatively high initial temperature. When passing the edge of the substrate 11, the coolant is cooled significantly due to the relatively low temperature of the edge region of the battery pack, causing the edge region of the battery pack to heat up rapidly. The coolant continues to flow along the flow channel. Since the temperature of the middle region of the battery pack is relatively high, the temperature difference between the cooled coolant and the center region of the battery pack is relatively small. Although the cooled coolant can still heat the center region of the battery pack, the temperature increase of the center region of the battery pack is relatively small. Ultimately, both the center region and the edge region of the battery pack are effectively heated, and the temperature difference between each region of the battery pack is relatively small.

[0073] In the embodiment of the present application, the provision of two flow channel disk areas 111 can shorten the length of the flow channel 12 of each flow channel disk area 111, thereby shortening the flow distance and flow time of the coolant in the flow channel 12, accelerating the circulation speed of the coolant in the liquid cold plate 2, and improving the heat exchange effect of the coolant. Under high or low temperature operating conditions, there is a certain temperature difference between the edge area and the center area of the battery pack, so that the flow path of the coolant can effectively exchange heat with each area of the battery pack. The temperature difference between the various areas of the battery pack after heat exchange is small, so that the heat dissipation area of the battery pack maintains a relatively uniform temperature, which is beneficial to the thermal management of the battery pack and enables the battery pack to operate normally at an appropriate temperature.

[0074] Among them, the relative positions of the first area 1113 and the second area 1114 can be that one area is close to one side of the substrate 11 and the other area is close to the other side of the substrate 11, or one area is set near the edge of the substrate 11 and the other area is set in the center of the substrate 11. The embodiments of the present application do not limit this.

[0075] Figure 5 This is a schematic diagram of the structure of a flow channel plate provided in an embodiment of the present application. Figure 6 This is a schematic diagram of the structure of a first region provided in an embodiment of the present application. Figure 7 A schematic structural diagram of a second region provided in an embodiment of the present application.

[0076] like Figures 3 to 7 As shown, in an optional embodiment, the flow channel disk area 111 includes a first area 1113 and a second area 1114, each of which is used to correspond to a different battery module. The first area 1113 is provided with a first flow channel 121, and the second area 1114 is provided with a first flow channel 122. The first flow channel 121 and the first flow channel 122 are interconnected, so that the first flow channel 121 and the first flow channel 122 share a liquid inlet corresponding area 1111 and / or a liquid outlet corresponding area 1112.

[0077] The areas where heat exchange can be performed in the first region 1113 and the second region 1114 are different. Since the areas where heat dissipation is required for different battery modules may be different, the design of the flow channel plate 1 can be adjusted so that the flow channels in the first region 1113 and the second region 1114 correspond to the areas where heat dissipation is required.

[0078] Compared with a single flow channel, the first flow channel 121 and the second flow channel 122 that are interconnected have shorter flow channel lengths, so that the flow distance and flow time of the coolant in the first flow channel 121 or the second flow channel 122 are shorter, thereby accelerating the circulation speed of the coolant in the flow channel 12 to improve the heat exchange effect of the coolant, thereby enabling the battery pack to obtain a better heat exchange effect.

[0079] The arrangement of the first flow channel 121 and the second flow channel 122 sharing the liquid inlet corresponding area 1111 allows the coolant flowing into the liquid inlet corresponding area 1112 to be split into the first flow channel 121 and the second flow channel 122. Compared to a single flow channel, splitting the flow into the first flow channel 121 and the second flow channel 122 increases the number of flow paths for the coolant, resulting in lower flow resistance for the coolant, allowing for better circulation of the coolant and thus achieving a better heat exchange effect for the battery pack.

[0080] The shared outlet region 1112 of the first and second flow channels 121, 122 allows the coolant in the first and second flow channels 121, 122 to converge and flow out through the outlet region 1112. This convergence of the coolant in the first and second flow channels 121, 122 reduces the number of coolant flow paths, allowing the coolant to flow faster. This allows the coolant, having completed heat exchange, to quickly flow out of the liquid cold plate through the outlet region 1112, accelerating the circulation of the coolant and achieving better heat exchange, thereby enhancing heat exchange for the battery pack.

[0081] In addition, the setting form of the first flow channel 121 and the second flow channel 122 sharing the liquid inlet corresponding area 1111 and / or the liquid outlet corresponding area 1112 can reduce the number of settings of the liquid inlet corresponding area 1111 and / or the liquid outlet corresponding area 1112 and the corresponding flow paths, so as to simplify the structural form of the flow channel 12, thereby facilitating the thermal management of the battery pack.

[0082] Optionally, the first flow channel 121 and the second flow channel 122 have two communication locations, and the two communication locations are respectively close to the liquid inlet corresponding area 1111 and the liquid outlet corresponding area 1112.

[0083] The connection position close to the corresponding area 1111 of the liquid inlet can make the coolant flowing in through the liquid inlet 211 quickly diverted to the first flow channel 121 and the second flow channel 122. At this time, the temperature of the coolant is closer to the initial temperature of the coolant when it flows in from the liquid inlet 211. Therefore, the temperature of the coolant diverted to the first flow channel 121 and the second flow channel 122 is basically the same, and the cooling effect on different battery modules is also relatively close, which reduces the difference in cooling degree of different battery modules and reduces the temperature difference between different battery modules.

[0084] The connection position close to the corresponding area 1112 of the liquid outlet can make the coolant in the first flow channel 121 and the second flow channel 122 converge when they are about to flow out of the liquid cold plate, thereby not affecting the cooling effect of the coolant in the first flow channel and the second flow channel on the battery modules in their respective corresponding areas, reducing the difference in cooling degree of different battery modules and reducing the temperature difference between different battery modules.

[0085] See Figure 4 Optionally, when the two flow channel disk areas 111 are arranged side by side on the substrate 11, the two flow channel disk areas 111 are symmetrically arranged in the side-by-side direction.

[0086] The two flow channel disk areas are arranged side by side on the substrate, so that both flow channel disk areas can realize that the coolant flows from the liquid inlet 211 through the flow channel 12 to the liquid outlet 212, first passing through the edge of the substrate 11 and then passing through the middle of the substrate 11, providing the possibility of reducing the temperature difference between the edge area and the middle area of the entire battery pack.

[0087] The two symmetrically arranged flow channel disk areas 111 make the lengths of the flow channels 12 of the two flow channel disk areas 111 substantially the same, and the sizes of the areas that can be cooled by the two flow channel disk areas 111 are also substantially the same, so that the temperature of the coolant from flowing in to flowing out of the two flow channel disk areas 111 is also substantially the same. Therefore, the battery modules corresponding to the two flow channel disk areas 111 can be cooled to the same extent relatively synchronously, that is, different areas of the battery pack can perform heat exchange synchronously, which is beneficial to the thermal management of the battery pack.

[0088] like Figure 6 As shown, optionally, at least a portion of the first flow channel 121 includes a plurality of first branch flow channels 1211 , and the plurality of first branch flow channels 1211 are arranged side by side in a direction perpendicular to the flow direction of the coolant and are interconnected.

[0089] On the one hand, multiple first branch channels 1211 can increase the cross-sectional area of the channel 12 and reduce the flow resistance of the coolant in the first channel 121, so as to speed up the flow rate of the coolant and improve the heat exchange effect of the coolant. On the other hand, they can increase the number of flow paths of the coolant in the flow direction within the first channel 121, avoiding the problem of blockage of a single flow path when the liquid cooling plate 2 is conducting a ball hitting test or during use, so that the coolant can still flow normally in the first channel 121 under harsh use conditions, thereby improving the safety performance and reliability of the channel plate 1.

[0090] See Figure 7 Optionally, at least a portion of the second flow channel 122 includes a plurality of second branch flow channels 1221, and the plurality of second branch flow channels 1221 are arranged side by side in a direction perpendicular to the flow direction of the coolant and are interconnected.

[0091] On the one hand, multiple second branch channels 1221 can increase the cross-sectional area of the channel 12 and reduce the flow resistance of the coolant in the second channel 122, so as to speed up the flow rate of the coolant and improve the heat exchange effect of the coolant. On the other hand, it can increase the number of flow paths of the coolant in the flow direction within the second channel 122, avoiding the problem of blockage of a single flow path when the liquid cooling plate 2 is conducting a ball hitting test or during use, so that the coolant can still flow normally in the second channel 122 under harsh use conditions, thereby improving the safety performance and reliability of the channel plate 1.

[0092] like Figure 6 and Figure 7 As shown, optionally, a spoiler 123 is provided at the bend of the flow channel 12 .

[0093] When the designed flow direction of the flow channel 12 changes, the spoiler 123 can change the original flow state of the coolant flowing near the spoiler 123, and the flowing coolant enters a turbulent state. After continuous mixing, the temperature of the coolant is made more uniform, thereby reducing the difference in cooling degree of different battery modules and making the temperature of each part of the battery pack more balanced, which is beneficial to the thermal management of the battery pack.

[0094] In addition, the provision of the spoiler 123 can also prevent a large amount of coolant from concentrating on the bending area of the flow channel 12, thereby avoiding the problem that the bending area of the flow channel 12 is damaged by the impact of the coolant after long-term use, thereby enabling the flow channel plate 1 to work normally and stably, extending the service life of the flow channel plate 1, and improving the reliability of the flow channel plate 1.

Claims

1. A flow channel plate, characterized in that: It includes a substrate and a flow channel, wherein the flow channel is provided on the substrate. The substrate includes two flow channel disc areas, each of which is provided with the flow channel; The flow channel plate is provided with a liquid inlet corresponding area and a liquid outlet corresponding area, the liquid inlet corresponding area is used to set the liquid inlet or is set directly opposite the liquid inlet, and the liquid outlet corresponding area is used to set the liquid outlet or is set directly opposite the liquid outlet. In the process of the coolant flowing from the liquid inlet through the flow channel to the liquid outlet, the coolant first passes through the edge of the substrate and then passes through the middle of the substrate; The flow channel plate area includes a first area and a second area, wherein the first area and the second area are respectively used to correspond to different battery modules; The first region disk is provided with a first flow channel, the second region disk is provided with a second flow channel, the first flow channel and the second flow channel are interconnected so that the first flow channel and the second flow channel share a liquid inlet corresponding area and / or a liquid outlet corresponding area; The first flow channel and the second flow channel have two communication positions, and the two communication positions are respectively close to the area corresponding to the liquid inlet and the area corresponding to the liquid outlet.

2. The flow channel plate according to claim 1, characterized in that: The two flow channel disk areas are arranged side by side on the substrate, and the two flow channel disk areas are symmetrically arranged in the side-by-side direction.

3. The flow channel plate according to claim 1, characterized in that: At least a portion of the first flow channel includes a plurality of first branch flow channels, and the plurality of first branch flow channels are arranged side by side in a direction perpendicular to the flow direction of the coolant and are interconnected.

4. The flow channel plate according to claim 1, characterized in that: At least a portion of the second flow channel includes a plurality of second branch flow channels, and the plurality of second branch flow channels are arranged side by side in a direction perpendicular to the flow direction of the coolant and are interconnected.

5. The flow channel plate according to any one of claims 1 to 4, characterized in that: A spoiler is provided at the bend of the flow channel.

6. A liquid cooling plate, characterized in that: The invention comprises a shell and the flow channel plate according to any one of claims 1 to 5, wherein the shell is connected to the base plate, and a chamber for the flow of cooling liquid is formed between the shell and the side wall of the flow channel.

7. The liquid cooling plate according to claim 6, wherein: The liquid cooling plate further includes a plurality of water pipe joints, which are arranged on a side of the shell away from the flow channel plate and are connected to the flow channel, and the liquid inlet corresponding area and the liquid outlet corresponding area are respectively arranged opposite to one of the water pipe joints.

8. A battery pack, characterized in that: The device comprises a battery module and a liquid cooling plate as claimed in claim 6 or 7, wherein the liquid cooling plate is connected to one side of the battery module.

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