Liquid cooling plate, battery pack and liquid cooling plate design verification method

Abstract

The application relates to the technical field of battery liquid cooling, in particular to a liquid cooling plate, a battery pack and a liquid cooling plate design verification method, the liquid cooling plate comprises a plurality of flow guide parts, a first layer plate and a second layer plate which are arranged opposite to each other along a first direction, the flow guide parts extend along a second direction, and the plurality of flow guide parts are arranged at intervals in a third direction between the first layer plate and the second layer plate, so that a plurality of parallel flow channels are separated between the first layer plate and the second layer plate. Two adjacent parallel flow channels are communicated through the end parts of the parallel flow channels in the second direction. A figure formed by sequentially connecting the first ends of the plurality of flow guide parts is defined as a first figure, and a figure formed by sequentially connecting the second ends of the plurality of flow guide parts is defined as a second figure. The first figure and / or the second figure is a zigzag line or a wavy line. According to the liquid cooling plate, the battery pack and the liquid cooling plate design verification method provided in the application, the cooling efficiency of the liquid cooling plate is improved, the temperature difference of the liquid cooling plate is reduced, and the risk of thermal runaway of the existing battery pack is reduced.

Description

TECHNICAL FIELD

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

[0002] New energy storage has entered a stable development stage after a period of rapid development. In particular, the initial situation of wind-cooled new energy storage has changed, and the market development has put forward higher requirements for battery temperature and battery temperature difference.

[0003] However, the cooling form of the current wind-cooled energy storage pack and the flow channel liquid-cooled energy storage pack still has a large risk of thermal runaway and a large battery temperature difference. How to further reduce the battery temperature and the battery temperature difference has become a crucial innovation focus in the field of new energy storage. SUMMARY

[0004] The purpose of the present application is to provide a liquid cooling plate, a battery pack and a liquid cooling plate design verification method to solve the technical problems of the current wind-cooled energy storage pack and the flow channel liquid-cooled energy storage pack still having a large risk of thermal runaway and a large battery temperature difference.

[0005] According to a first aspect of the present application, a liquid cooling plate is provided, comprising a plate layer structure and a plurality of flow guide portions, the plate layer structure comprising a first layer plate and a second layer plate arranged opposite to each other along a first direction, the flow guide portions extending along a second direction, and a plurality of the flow guide portions being arranged in a third direction between the first layer plate and the second layer plate to separate a plurality of parallel flow channels extending along the second direction between the first layer plate and the second layer plate;

[0006] Two adjacent parallel flow channels are connected via the end of the parallel flow channel in the second direction;

[0007] A pattern formed by sequentially connecting the first ends of the plurality of flow guide portions in the first direction is defined as a first pattern, and a pattern formed by sequentially connecting the second ends of the plurality of flow guide portions in the first direction is defined as a second pattern;

[0008] The first pattern and / or the second pattern is a broken line or a wavy line;

[0009] The second direction intersects the third direction, and the first direction intersects the plane determined by the second direction and the third direction.

[0010] Preferably, the flow guide portion comprises:

[0011] a first baffle plate, a first end of the first baffle plate in the second direction being sealingly connected with a first end of the plate layer structure in the second direction, a second end of the first baffle plate in the second direction being provided with a first channel between the second end of the first baffle plate in the second direction and a second end of the plate layer structure in the second direction;

[0012] a second baffle plate, a first end of the second baffle plate in the second direction being provided with a second channel between the first end of the second baffle plate in the second direction and the first end of the plate layer structure in the second direction, a second end of the second baffle plate in the second direction being sealingly connected with the second end of the plate layer structure in the second direction;

[0013] the first baffle plate and the second baffle plate are alternately arranged in the third direction.

[0014] Preferably, both the first pattern and the second pattern are polygonal lines.

[0015] the first baffle plate is located on a turning point of the second pattern, and the second baffle plate is located on a turning point of the first pattern.

[0016] Preferably, the flow guide part further comprises a partition plate, a plurality of partition plates being arranged between adjacent first baffle plates and second baffle plates to divide a plurality of flow channels that are in communication with each other.

[0017] Preferably, the flow guide part further comprises a rib plate, the rib plate being larger in size than the partition plate in the second direction.

[0018] the rib plate is arranged at a middle position between adjacent first baffle plates and second baffle plates.

[0019] Preferably, the plate layer structure is divided into a plurality of flow-through areas by the first baffle plates and the second baffle plates in sequence.

[0020] the plate layer structure further comprises an inlet hole and an outlet hole, the inlet hole and the outlet hole being arranged in the flow-through areas at both ends of the plate layer structure in the third direction, respectively.

[0021] Preferably, the inlet hole and the outlet hole are arranged at the same end of the plate layer structure in the first direction.

[0022] and / or, in the third direction, the inlet hole and the outlet hole are aligned with the turning points of the corresponding first pattern or second pattern.

[0023] According to the embodiments of the second aspect of the present application, a battery pack is also provided, comprising a battery module and the liquid cooling plate of any of the above embodiments, thus having all the beneficial technical effects of the liquid cooling plate, which will not be repeated here.

[0024] According to the second aspect of the present application, a liquid cooling plate design verification method is provided, comprising the liquid cooling plate of any of the above technical solutions, thus having all the beneficial technical effects of the liquid cooling plate, which will not be repeated here.

[0025] Specifically, the steps include:

[0026] constructing a liquid cooling plate model, designing the structure of the liquid cooling plate and the size of the liquid cooling plate, and selecting the shapes of the first pattern and the second pattern;

[0027] determining relevant parameters, selecting the material of the liquid cooling plate and the material of the cooling liquid in the flow channel of the liquid cooling plate, designing the structure of the battery module, and determining the simulation parameters of the liquid cooling plate, the cooling liquid, and the battery module;

[0028] setting thermal simulation boundary conditions, setting the initial temperature of the battery module, the initial temperature of the cooling liquid entering the liquid cooling plate, the flow rate of the cooling liquid, the heat generation power of the battery module, and the design margin;

[0029] constructing a simulation model, constructing a simulation model according to the assembly structure between the battery module and the liquid cooling plate through a thermal simulation software, and performing mesh division on the simulation model;

[0030] outputting simulation conclusions, simulating the use state of the simulation model by applying a thermal simulation software, and outputting the temperature cloud map of the simulation model, the pressure cloud map of the liquid cooling plate, and the cooling liquid flow rate cloud map in the liquid cooling plate.

[0031] Preferably, the liquid cooling plate design verification method further comprises:

[0032] model comparison test, changing the shapes of the first pattern and the second pattern, reconstructing a liquid cooling plate model, and sequentially repeating the steps of determining relevant parameters, setting thermal simulation boundary conditions, constructing a simulation model, and outputting simulation conclusions to obtain the temperature cloud map of the model, the pressure cloud map of the liquid cooling plate, and the cooling liquid flow rate cloud map in the liquid cooling plate; or parameter comparison test, changing the material of the liquid cooling plate or the material of the cooling liquid in the flow channel of the liquid cooling plate, and sequentially repeating the steps of setting thermal simulation boundary conditions, constructing a simulation model, and outputting simulation conclusions to obtain the temperature cloud map of the model, the pressure cloud map of the liquid cooling plate, and the cooling liquid flow rate cloud map in the liquid cooling plate;

[0033] Conclusions, comparing the conclusions of the simulation model and the model with model comparison; or, comparing the conclusions of the simulation model and the model with parameter comparison, completing the verification;

[0034] and / or,

[0035] The simulation parameters include the density, specific heat capacity and thermal conductivity of the liquid cooling plate, the cooling liquid and the battery module, and the viscosity of the cooling liquid.

[0036] Compared with the prior art, the beneficial effects of the present application are:

[0037] The liquid cooling plate provided by the present application effectively expands the communication space of the end portions of the two adjacent parallel flow channels by setting the first pattern and / or the second pattern as a polyline or a wavy line, thereby reducing the probability of vortex flow of the cooling liquid at the communication portion of the two adjacent parallel flow channels, effectively improving the kinetic energy loss of the cooling liquid in the liquid cooling plate, ensuring the uniformity of the flow rate of the cooling liquid in the liquid cooling plate, effectively improving the cooling efficiency of the liquid cooling plate, and thereby effectively reducing the temperature difference of the liquid cooling plate and reducing the risk of thermal runaway of the existing battery pack.

[0038] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0040] Figure 1 The cross-sectional structure schematic diagram obtained by cutting the liquid cooling plate provided by the embodiment of the present application along the plane determined by the second direction and the third direction;

[0041] Figure 2 Another cross-sectional structure schematic diagram obtained by cutting the liquid cooling plate provided by the embodiment of the present application along the plane determined by the second direction and the third direction;

[0042] Figure 3 The partial cross-sectional structure schematic diagram obtained by cutting the liquid cooling plate provided by the embodiment of the present application along the plane determined by the first direction and the third direction;

[0043] Figure 4 The overall temperature cloud picture of the battery pack obtained by the thermal simulation experiment of the existing liquid cooling plate;

[0044] Figure 5 Temperature cloud map of the upper end section of the battery pack obtained by thermal simulation experiment on the existing liquid cooling plate;

[0045] Figure 6 Temperature cloud map of the middle section of the battery pack obtained by thermal simulation experiment on the existing liquid cooling plate;

[0046] Figure 7 Cooling liquid pressure cloud map obtained by thermal simulation experiment on the existing liquid cooling plate;

[0047] Figure 8 Cooling liquid velocity cloud map obtained by thermal simulation experiment on the existing liquid cooling plate;

[0048] Figure 9 Overall temperature cloud map of the battery pack obtained by thermal simulation experiment on the liquid cooling plate provided by the embodiment of the application;

[0049] Figure 10 Temperature cloud map of the upper end section of the battery pack obtained by thermal simulation experiment on the liquid cooling plate provided by the embodiment of the application;

[0050] Figure 11 Temperature cloud map of the middle section of the battery pack obtained by thermal simulation experiment on the liquid cooling plate provided by the embodiment of the application;

[0051] Figure 12 Cooling liquid pressure cloud map obtained by thermal simulation experiment on the liquid cooling plate provided by the embodiment of the application;

[0052] Figure 13 Cooling liquid velocity cloud map obtained by thermal simulation experiment on the liquid cooling plate provided by the embodiment of the application;

[0053] Figure 14 Temperature rise comparison chart of the existing liquid cooling plate and the liquid cooling plate provided by the application;

[0054] Figure 15 Flow chart of the liquid cooling plate design verification method provided by the embodiment of the application.

[0055] Reference signs:

[0056] 1-plate layer structure; 11-first layer plate; 12-second layer plate; 131-liquid inlet hole; 132-liquid outlet hole; 20-flow-through area; 211-first flow barrier; 212-second flow barrier; 22-baffle; 23-rib plate; 31-first pattern; 32-second pattern.

[0057] F1-first direction; F2-second direction; F3-third direction. DETAILED DESCRIPTION

[0058] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application.

[0059] The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application.

[0060] Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present application.

[0061] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0062] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0063] The following will be described with reference to Figures 1 to 15 The liquid cooling plate, the battery pack and the liquid cooling plate design verification method according to some embodiments of the present application are described.

[0064] Referring to Figures 1 to 13As shown, the embodiment of the first aspect of the present application provides a liquid cooling plate, which comprises a plate layer structure 1 and a plurality of flow guide parts, the plate layer structure 1 comprises a first layer plate 11 and a second layer plate 12 arranged opposite to each other along a first direction F1, the flow guide parts extend along a second direction F2, and the plurality of flow guide parts are arranged in a third direction F3 between the first layer plate 11 and the second layer plate 12 to separate a plurality of parallel flow channels extending along the second direction F2 between the first layer plate 11 and the second layer plate 12. Adjacent two parallel flow channels are communicated via the ends of the parallel flow channels in the second direction F2. A pattern formed by sequentially connecting the first ends of the plurality of flow guide parts in the first direction F1 is defined as a first pattern 31, and a pattern formed by sequentially connecting the second ends of the plurality of flow guide parts in the first direction F1 is defined as a second pattern 32. The first pattern 31 and / or the second pattern 32 is a zigzag line or a wavy line. The second direction F2 intersects with the third direction F3, and the first direction F1 intersects with the planes determined by the second direction F2 and the third direction F3.

[0065] According to the above technical features, the liquid cooling plate is provided, by setting the first pattern 31 and / or the second pattern 32 as a zigzag line or a wavy line, thus effectively expanding the communication space of the ends of the adjacent two parallel flow channels, thereby reducing the probability of vortex of the cooling liquid at the communication of the adjacent two parallel flow channels, thereby effectively improving the kinetic energy loss of the cooling liquid in the liquid cooling plate, ensuring the uniformity of the flow rate of the cooling liquid in the liquid cooling plate, effectively improving the cooling efficiency of the liquid cooling plate, thereby effectively reducing the temperature difference of the liquid cooling plate and reducing the risk of thermal runaway of the existing battery pack.

[0066] As shown in Figures 1 to 3 , F1 shown in the figure can be an example of the above-mentioned first direction, F2 shown in the figure can be an example of the above-mentioned second direction, and F3 shown in the figure can be an example of the above-mentioned third direction. Preferably, the above-mentioned first direction F1 is perpendicular to the second direction F2 and the third direction F3. Preferably, the above-mentioned second direction F2 and the third direction F3 can be perpendicular to each other to be suitable for most battery pack structures.

[0067] Preferably, as shown in Figure 1 and Figure 2 , the above-mentioned first pattern 31 and the second pattern 32 can both be zigzag lines, on the one hand, the zigzag line is more convenient for the installation and positioning of the flow guide part than the wavy line; on the other hand, the communication space of the two ends of the adjacent two parallel flow channels is simultaneously expanded, which can further reduce the probability of vortex of the cooling liquid at the communication of the adjacent two parallel flow channels, thereby further ensuring the uniformity of the flow rate of the cooling liquid in the liquid cooling plate and effectively improving the cooling efficiency of the liquid cooling plate.

[0068] However, the forms of the first pattern 31 and the second pattern 32 are not limited to the forms of the broken lines, as long as the probability of vortexes being generated at the communication positions between two adjacent parallel flow channels can be reduced. For example, the first pattern 31 and the second pattern 32 can be wavy lines. For another example, the first pattern 31 is a straight line, and the second pattern 32 is a wavy line or a broken line. For yet another example, the first pattern 31 is a wavy line or a broken line, and the second pattern 32 is a straight line.

[0069] As shown in FIG. 1, the first pattern 31 and the second pattern 32 are formed by connecting the first ends of the plurality of flow guide portions in the first direction F1 and the second ends of the plurality of flow guide portions in the first direction F1 in sequence. It should be noted that the dashed lines in the drawing do not represent physical structures in the actual structure of the liquid cooling plate. Figure 1

[0070] Preferably, the angle between two adjacent broken line segments in the first pattern 31 can be 90°-150° (e.g., 90°, 100°, 110°, 120°, 130°, 140°, or 150°), so as to ensure the uniformity of the flow of the cooling liquid in each flow-through region 20.

[0071] Preferably, the angle bisector of two adjacent broken line segments in the first pattern 31 can extend along the second direction F2, in other words, the angle between each broken line segment in the first pattern 31 and the second direction F2 is 45°-75°, so as to further improve the uniformity of the flow of the cooling liquid in each flow-through region 20.

[0072] Similarly, the angle between two adjacent broken line segments in the second pattern 32 can also be 90°-150°, and the angle bisector of two adjacent broken line segments in the second pattern 32 can also extend along the second direction F2, which has similar beneficial effects to the first pattern 31, and thus will not be described herein.

[0073] Preferably, as shown in FIG. 1, the first pattern 31 and the second pattern 32 can be symmetric with respect to the second direction F2. Figure 1 Figure 2 ​​As shown, the flow guide portion can include a first baffle 211 and a second baffle 212, the first baffle 211 and the second baffle 212 are arranged alternately in the third direction F3. Among them, the first end of the first baffle 211 in the second direction F2 is sealingly connected with the first end of the plate layer structure 1 in the second direction F2, and the second end of the first baffle 211 in the second direction F2 and the second end of the plate layer structure 1 in the second direction F2 are both provided with a first channel. The first end of the second baffle 212 in the second direction F2 and the first end of the plate layer structure 1 in the second direction F2 are both provided with a second channel, and the second end of the second baffle 212 in the second direction F2 is sealingly connected with the second end of the plate layer structure 1 in the second direction F2. In this way, the cooling liquid can flow along the serpentine reciprocating flow channel formed by the first baffle 211 and the second baffle 212 in the liquid cooling plate, effectively prolonging the travel of the cooling liquid in the liquid cooling plate and improving the cooling efficiency of the liquid cooling plate.

[0074] It should be noted that, as Figure 1 and Figure 2 shown, in order to ensure the regularity of the first pattern 31 and the second pattern 32, the first end of the first baffle 211 is not on the first pattern 31, and the second end of the second baffle 212 is not on the second pattern 32.

[0075] As shown in Figure 1 and Figure 2 for ease of description, the plurality of regions sequentially divided by the first baffle 211 and the second baffle 212 of the plate layer structure 1 are defined as flow-through regions 20. As Figure 1 shown by the dashed arrows in the figure, the flow direction of the cooling liquid is the same in the same fluid region.

[0076] Preferably, as Figure 1 and Figure 2 shown, the first baffle 211 is located at the inflection point of the second pattern 32, and the second baffle 212 is located at the inflection point of the first pattern 31. When the cooling liquid flows into the first channel (and the second channel), the flow direction of the cooling liquid will be turned by a large angle (for example, 180°). By arranging the first baffle 211 and the second baffle 212 at the inflection points of the first pattern 31 and the second pattern 32, it can effectively ensure that the first channel and the second channel have enough space, and further ensure that the cooling liquid has enough space to turn, which can further reduce the vortex of the cooling liquid at the first channel and the second channel.

[0077] It should be noted that the inflection point of the first graph 31 can be understood as the point farthest from the first end of the plate structure 1 in the second direction F2. Correspondingly, the inflection point of the second graph 32 can be understood as the point farthest from the second end of the plate structure 1 in the second direction F2.

[0078] Preferably, as shown in Figures 1 to 3 , the flow guide part can further include a baffle plate 22, a plurality of baffle plates 22 are arranged between adjacent first baffles 211 and second baffles 212 to separate a plurality of interconnected flow channels between adjacent first baffles 211 and second baffles 212. In this way, on the one hand, the support strength between the first plate 11 and the second plate 12 is ensured; on the other hand, the cooling liquid in each flow area 20 is effectively divided, thereby ensuring the uniformity of the cooling liquid flow rate distribution in the flow area.

[0079] Preferably, as shown in Figures 1 to 3 , the flow guide part can further include a rib plate 23, the size of the rib plate 23 in the second direction F2 is greater than the size of the baffle plate 22, and the rib plate 23 is arranged at the middle position between adjacent first baffles 211 and second baffles 212. In this way, the support strength between the first plate 11 and the second plate 12 is further improved, and the probability of extrusion deformation of the liquid cooling plate is effectively reduced.

[0080] As shown in Figure 3 , the first baffles 211, the second baffles 212, the baffle plates 22 and the rib plates 23 can all be strip plates, and the two ends of the strip plate in the first direction F1 can be respectively sealed and connected with the first plate 11 and the second plate 12. Preferably, as shown in Figure 3 , the strip plate can be parallel to the two determined planes of the first direction F1 and the second direction F2 to ensure the space of the flow channel, but is not limited thereto. The strip plate can also be acute to the two determined planes of the first direction F1 and the second direction F2.

[0081] Preferably, in the third direction F3, the distance between two adjacent flow guide parts can be 25-30mm to ensure the flow space of each parallel flow channel and the support strength of the liquid cooling plate.

[0082] In the embodiment, as shown in Figure 1 and Figure 2 , the plate structure 1 can further include an inlet hole 131 and an outlet hole 132, and the inlet hole 131 and the outlet hole 132 are respectively arranged in the flow area 20 at the two ends of the plate structure 1 in the third direction F3. In this way, the cooling liquid can flow through all the flow areas 20.

[0083] Preferably, as shown in Figure 1 and Figure 2As shown, the liquid inlet hole 131 and the liquid outlet hole 132 are both arranged at the same end of the plate layer structure 1 in the first direction F1, so that the pipeline connection of the liquid cooling plate is facilitated, that is, the liquid inlet pipe in communication with the liquid inlet hole 131 and the liquid outlet pipe in communication with the liquid outlet hole 132 can be arranged at the same side of the liquid cooling plate, effectively saving the pipeline space occupied by the battery pack and facilitating the pipeline wiring.

[0084] As shown in FIG. 1, Figure 1 and Figure 2 , an example in which the liquid inlet hole 131 and the liquid outlet hole 132 are both arranged at the first end of the plate layer structure 1 is shown, and preferably, the liquid inlet hole 131 and the liquid outlet hole 132 are both aligned with the inflection points of the first pattern 31. However, it is not limited thereto, and the liquid inlet hole 131 and the liquid outlet hole 132 can also be arranged at the second end of the plate layer structure 1, and correspondingly, the liquid inlet hole 131 and the liquid outlet hole 132 are both aligned with the inflection points of the second pattern 32, so that the liquid inlet hole 131 and the liquid outlet hole 132 can effectively ensure sufficient space at the liquid inlet hole 131 and the liquid outlet hole 132, and ensure the flow rate of the cooling liquid at the liquid inlet hole 131 and the liquid outlet hole 132.

[0085] As shown in FIG. 1, Figures 9 to 11 , the embodiments of the second aspect of the present application also provide a battery pack comprising a battery module and the liquid cooling plate of any of the above-mentioned embodiments, thus having all the beneficial technical effects of the liquid cooling plate, which will not be described herein.

[0086] Preferably, the above-mentioned battery pack can comprise a plurality of battery modules, and each battery module comprises a plurality of battery cells arranged in a stack along the second direction F2.

[0087] Preferably, each of the above-mentioned flow-through areas 20 is correspondingly provided with at least one of the above-mentioned battery modules.

[0088] Optionally, as shown in the figure, the battery pack further comprises a heat-conducting adhesive layer, which is laid on the surface of the plate layer structure 1, and the battery module is fixed to the plate layer structure 1 via the heat-conducting adhesive layer.

[0089] By applying the prior art liquid cooling plate and the liquid cooling plate provided by the present application to the above-mentioned battery pack structure through thermal simulation technology, the following conclusions are obtained:

[0090] Prior art liquid cooling plate:

[0091] As shown in FIG. 1, Figures 4 to 8 , examples of the prior art liquid cooling plate in which the first pattern 31 and the second pattern 32 are both straight lines are shown, and the temperature cloud map of the battery pack (including the overall temperature cloud map, the upper end cross-sectional temperature cloud map, and the middle cross-sectional temperature cloud map), the cooling liquid pressure cloud map in the liquid cooling plate, and the cooling liquid flow rate cloud map in the liquid cooling plate are shown under the condition that the liquid inlet hole 131 flow rate is 5 L / min and the battery module is discharged at 0.5C for 2h. Among them, according to Figures 4 to 6It can be seen that the maximum temperature of the battery module is 40.4℃, and the battery module is heated by 0.4℃ under the condition of liquid cooling; the maximum temperature of the upper end section of the battery module is 40.4℃, and the minimum temperature is 32.3℃, and the temperature difference is 8.1℃; the maximum temperature of the middle section of the battery module is 38.7℃, and the minimum temperature is 30.1℃, and the temperature difference is 8.6℃. According to Figure 7 It can be seen that the maximum pressure of the cooling liquid is about 0.8KPa. According to Figure 8 It can be seen that the maximum flow rate of the cooling liquid is 0.5m / s, and the minimum flow rate of the cooling liquid is 0.012m / s.

[0092] As shown in the liquid cooling plate, Figures 1 to 3 The liquid cooling plate is taken as an example:

[0093] Figures 9 to 13 , respectively, the first graph 31 and the second graph 32 in the present application are both examples of the liquid cooling plate with a fold line, and the temperature cloud map of the liquid cooling plate acting on the battery module, the cooling liquid pressure cloud map in the liquid cooling plate and the cooling liquid flow rate cloud map in the liquid cooling plate under the same conditions, i.e. (the liquid cooling plate with the liquid inlet hole 131 flow rate is 5L / min, the battery module is discharged at 0.5C for 2h) are shown. The first graph 31 and the second graph 32 provided by the application are both examples of the liquid cooling plate with a fold line. Among them, according to Figures 9 to 11 It can be seen that the maximum temperature of the battery module is 35.2℃, and the battery module is cooled by 4.8℃ under the condition of liquid cooling; the maximum temperature of the upper end section of the battery module is 35.2℃, and the minimum temperature is 32.4℃, and the temperature difference is 2.8℃; the maximum temperature of the middle section of the battery module is 32.3℃, and the minimum temperature is 29.5℃, and the temperature difference is 2.8℃. According to Figure 7 It can be seen that the maximum pressure of the cooling liquid is about 2.04KPa. According to Figure 8 It can be seen that the maximum flow rate of the cooling liquid is 0.1m / s, and the minimum flow rate of the cooling liquid is 0.09m / s.

[0094] Table 1 comparative data:

[0095]

[0096] As Figure 14 shown, the temperature rise of the existing liquid cooling plate and the liquid cooling plate provided by the present application is shown in the figure, wherein Ⅰ represents the temperature rise curve of the existing liquid cooling plate, and Ⅱ represents the temperature rise curve of the liquid cooling plate provided by the present application.

[0097] Under the same experimental conditions, compared with the existing liquid cooling plate, the liquid cooling plate provided by the present application has a maximum temperature drop of 5.2℃, the upper end cell section temperature difference is reduced by 5.3℃; the middle cell section temperature difference is reduced by 5.8℃, and the liquid cooling plate flow uniformity is improved by 80%.

[0098] In summary, the liquid cooling plate provided by the present application can effectively reduce the temperature difference of the battery module and greatly improve the flow uniformity of the cooling liquid in the liquid cooling plate.

[0099] Referring to Figures 4 to 15 As shown in the third aspect of the present application, the embodiments also provide a liquid cooling plate design verification method for designing and verifying the above-mentioned liquid cooling plate and battery pack, thus having all the beneficial technical effects of the liquid cooling plate, which will not be repeated here.

[0100] The steps include:

[0101] S01, a liquid cooling plate model is constructed, the structure of the liquid cooling plate is designed, the size of the liquid cooling plate is designed, and the shapes of the first graphic 31 and the second graphic 32 are selected.

[0102] Optionally, the design of the structure of the liquid cooling plate can include the design of the positions of the liquid inlet hole 131 and the liquid outlet hole 132 of the liquid cooling plate and the structure of the flow guide part.

[0103] Optionally, the design of the size of the liquid cooling plate can set the size of the liquid cooling plate according to the overall size of the battery pack.

[0104] Optionally, the selection of the shape of the first graphic 31 (or the second graphic 32) includes determining the linearity (e.g., broken line or wavy line) and distribution of the first graphic 31 (or the second graphic 32). Taking the first graphic 31 as a broken line as an example, the distribution of the first graphic 31 can include the span of each broken line segment and the included angle between two adjacent broken line segments.

[0105] S02, relevant parameters are determined, the material of the liquid cooling plate and the material of the cooling liquid in the flow channel of the liquid cooling plate are selected, the structure of the battery module is designed, and the simulation parameters of the liquid cooling plate, the cooling liquid and the battery module are determined.

[0106] Optionally, the material of the liquid cooling plate can be a heat-conducting metal (e.g., silver, aluminum, copper, etc.).

[0107] Optionally, the cooling liquid in the flow channel of the liquid cooling plate can be a heat-conducting liquid (e.g., water, ethylene glycol aqueous solution, etc.).

[0108] Optionally, the design of the battery module structure can include selecting the model size of the battery module and the number of included battery cells according to the actual needs of the battery pack, and then confirming the structure of the battery module, so that the assembly structure and size of the liquid cooling plate, the cooling liquid and the battery module are confirmed according to the structure of the liquid cooling plate and the structure of the battery module.

[0109] Preferably, the simulation parameters can include the density, specific heat capacity and thermal conductivity of the liquid cooling plate, the cooling liquid and the battery module, and the viscosity of the cooling liquid.

[0110] S03 setting the thermal simulation boundary conditions, setting the thermal simulation boundary conditions, setting the initial temperature of the battery module, the initial temperature of the cooling liquid into the liquid cooling plate, the flow rate of the cooling liquid, the heat generation power of the battery module and the design margin.

[0111] S04 constructing a simulation model, constructing a simulation model according to the assembly structure between the battery module and the liquid cooling plate through the thermal simulation software, and performing grid division on the simulation model.

[0112] Optionally, the above-mentioned thermal simulation software can be comsol software.

[0113] S05 outputting simulation conclusion, applying thermal simulation software to simulate the use state of the simulation model, and outputting the temperature nephogram of the simulation model, the pressure nephogram of the liquid cooling plate and the cooling liquid flow rate nephogram of the liquid cooling plate.

[0114] For example, referring to Figures 4 to 8 , a first liquid cooling plate model is constructed by the thermal simulation software according to the liquid cooling plate structure in the prior art, and the thermal simulation conclusion output by the above-mentioned method is used to set the process as follows:

[0115] According to S01 step, the first graph 31 and the second graph 32 are straight lines, and the other structures of the first liquid cooling plate model are the same as those shown in Figures 1 to 3 .

[0116] According to the S02 step, the related parameters are selected according to Table 2.

[0117] Table 2, material thermal physical property parameters

[0118]

[0119] According to the S03 step, the initial temperature of the battery is set to 40℃, the inlet temperature of the cooling plate is set to 20℃, the inlet flow rate is set to 5L / min, the battery module battery discharge rate is set to 0.5C (C represents the nominal capacity of the battery), the 0.5C discharge heat generation power is set to 12.48W, and 15% design margin is added during simulation analysis.

[0120] According to the S04 step, the polyhedral grid division is adopted on the thermal simulation software, and a total of 3380579 grids are divided.

[0121] Preferably, the liquid cooling plate design verification method can further include S061 model comparison test, changing the shape of the first graph 31 and the second graph 32, re-constructing the liquid cooling plate model, and sequentially repeating the steps of determining the related parameters, setting the thermal simulation boundary conditions, constructing the simulation model and outputting the simulation conclusion to obtain the model degree nephogram, the pressure nephogram of the liquid cooling plate and the cooling liquid flow rate nephogram in the liquid cooling plate.

[0122] It should be noted that the above changing the shape of the first graphic 31 and the second graphic 32 can be understood as changing the linear type (the linear type can include a straight line, a broken line and a wavy line) of one or both of the first graphic 31 and the second graphic 32, a line type distribution structure and the like, so that the influence of changing the shape of the first graphic 31 or the second graphic 32 on the performance of the liquid cooling plate is verified by the control variable method.

[0123] Preferably, the liquid cooling plate design verification method can further include S071 conclusion comparison, comparing the conclusions of the simulation model and the model comparison model, and completing the verification.

[0124] For example, referring to Figures 9 to 13 , a thermal simulation software is used to construct a second liquid cooling plate model according to Figures 1 to 3 , and the thermal simulation conclusion output by the above method is used to set the process as follows:

[0125] According to the S01 step, a second liquid cooling plate model is constructed according to the liquid cooling plate structure shown in Figures 1 to 3

[0126] According to the S02 step, the relevant parameters are selected according to Table 3.

[0127] Table 3, material thermal property parameters

[0128]

[0129] According to the S03 step, the battery initial temperature is set to 40℃, the cold plate inlet temperature is set to 20℃, the inlet flow rate is set to 5L / min, the battery module battery discharge rate is set to 0.5C (C represents the nominal capacity of the battery), the 0.5C discharge heat generation power is set to 12.48W, and a 15% design margin is added during simulation analysis.

[0130] According to the S04 step, the polyhedral mesh is divided on the thermal simulation software, and a total of 3380579 meshes are divided.

[0131] It should be noted that the above control variable comparison test is not limited to the way of changing the first graphic 31 and the second graphic 32. The above liquid cooling plate design verification method can further include S062 parameter comparison test, changing the material of the liquid cooling plate or the material of the cooling liquid in the flow channel of the liquid cooling plate, and repeatedly setting the thermal simulation boundary condition, constructing the simulation model and outputting the simulation conclusion step by step to obtain the degree cloud diagram of the parameter comparison model, the pressure cloud diagram of the liquid cooling plate and the cooling liquid flow velocity cloud diagram in the liquid cooling plate.

[0132] Correspondingly, the liquid cooling plate design verification method can further include S072 conclusion comparison, comparing the conclusions of the simulation model and the parameter comparison model, and completing the verification.

[0133] ​Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A liquid-cooled plate, characterized in that, The plate layer structure comprises a first layer plate and a second layer plate arranged opposite to each other along a first direction, and a plurality of flow guides extending along a second direction, the plurality of flow guides being arranged in a third direction between the first layer plate and the second layer plate to divide a plurality of parallel flow channels extending along the second direction between the first layer plate and the second layer plate; Two adjacent parallel flow channels are communicated via end portions of the parallel flow channels in the second direction; A pattern formed by sequentially connecting first ends of the plurality of flow guides in the first direction is defined as a first pattern, and a pattern formed by sequentially connecting second ends of the plurality of flow guides in the first direction is defined as a second pattern; The second direction intersects the third direction, and the first direction intersects a plane determined by the second direction and the third direction; The flow guide comprises: A first baffle plate, a first end of the first baffle plate in the second direction is sealingly connected to a first end of the plate layer structure in the second direction, and a first channel is arranged between a second end of the first baffle plate in the second direction and a second end of the plate layer structure in the second direction; A second baffle plate, a second channel is arranged between a first end of the second baffle plate in the second direction and a first end of the plate layer structure in the second direction, and a second end of the second baffle plate in the second direction is sealingly connected to a second end of the plate layer structure in the second direction; The first baffle plate and the second baffle plate are alternately arranged in the third direction; Both the first pattern and the second pattern are broken lines; A turning point of the first pattern is a point of the first pattern farthest from the first end of the plate layer structure in the second direction; A turning point of the second pattern is a point of the second pattern farthest from the second end of the plate layer structure in the second direction; An end of the first baffle plate close to the second end in the second direction is located at the corresponding turning point of the second pattern, and an end of the second baffle plate close to the first end in the second direction is located at the corresponding turning point of the first pattern; The plate layer structure is sequentially divided into a plurality of flow-through areas by the first baffle plate and the second baffle plate; The plate layer structure further comprises a liquid inlet hole and a liquid outlet hole, and the liquid inlet hole and the liquid outlet hole are arranged in the flow-through areas at two ends of the plate layer structure in the third direction, respectively; In the second direction, the liquid inlet hole and the liquid outlet hole are aligned with the turning points of the corresponding first pattern or second pattern; An included angle between two adjacent broken line segments in the first pattern is 90°-150°, and an included angle between two adjacent broken line segments in the second pattern is 90°-150°; Both an angle bisector of two adjacent broken line segments in the first pattern and an angle bisector of two adjacent broken line segments in the second pattern extend along the second direction; In the third direction, a distance between two adjacent flow guides is 25 mm-30 mm.

2. The liquid cold plate of claim 1, wherein, The flow guide part further comprises a plurality of partitions arranged between the adjacent first and second baffles to divide a plurality of flow channels connected to each other between the adjacent first and second baffles.

3. The liquid cold plate of claim 2, wherein, The flow guide part further comprises a rib plate, and the size of the rib plate is greater than the size of the partition in the second direction. The rib plate is arranged at a middle position between the adjacent first and second baffles.

4. The liquid cooling plate of claim 1, wherein The liquid inlet hole and the liquid outlet hole are arranged at the same end of the plate structure in the first direction.

5. A battery pack, characterized by, The battery module and the liquid cooling plate of any one of claims 1 to 4.

6. A liquid cold plate design verification method, comprising: Steps for designing and verifying the battery pack of claim 5 include: constructing a liquid cooling plate model, designing the structure and size of the liquid cooling plate, and selecting the shapes of the first and second patterns; determining relevant parameters, selecting the materials of the liquid cooling plate and the cooling liquid in the flow channel of the liquid cooling plate, designing the structure of the battery module, and determining the simulation parameters of the liquid cooling plate, the cooling liquid, and the battery module; setting thermal simulation boundary conditions, setting the initial temperature of the battery module, the initial temperature of the cooling liquid entering the liquid cooling plate, the flow rate of the cooling liquid, the heat generation power of the battery module, and the design margin; constructing a simulation model, constructing a simulation model according to the assembly structure between the battery module and the liquid cooling plate through a thermal simulation software, and performing mesh division on the simulation model; outputting simulation conclusions, simulating the use state of the simulation model by applying a thermal simulation software, and outputting the temperature cloud map of the simulation model, the pressure cloud map of the liquid cooling plate, and the cooling liquid flow rate cloud map in the liquid cooling plate.

7. The liquid cooling plate design verification method of claim 6, wherein The liquid cooling plate design verification method further comprises: model comparison test, changing the shapes of the first and second patterns, reconstructing a liquid cooling plate model, and sequentially repeating the steps of determining relevant parameters, setting thermal simulation boundary conditions, constructing a simulation model, and outputting simulation conclusions to obtain the temperature cloud map of the model, the pressure cloud map of the liquid cooling plate, and the cooling liquid flow rate cloud map in the liquid cooling plate; or parameter comparison test, changing the materials of the liquid cooling plate or the cooling liquid in the flow channel of the liquid cooling plate, and sequentially repeating the steps of setting thermal simulation boundary conditions, constructing a simulation model, and outputting simulation conclusions to obtain the temperature cloud map of the model, the pressure cloud map of the liquid cooling plate, and the cooling liquid flow rate cloud map in the liquid cooling plate; conclusion comparison, comparing the conclusions of the simulation model and the model comparison test; or comparing the conclusions of the simulation model and the parameter comparison test to complete the verification; and / or The simulation parameters include the density, specific heat capacity, and thermal conductivity of the liquid cooling plate, the cooling liquid, and the battery module, and the viscosity of the cooling liquid.

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