Direct cooling temperature control method and system of battery, battery assembly and vehicle

Abstract

The invention provides a direct cooling temperature control method and system of a battery, a battery assembly and a vehicle, and relates to the technical field of power batteries. According to the direct-cooling temperature control method of the battery provided by the embodiment of the invention, the first direct-cooling loop and the second direct-cooling loop are arranged for the battery, and in the method, the first direct-cooling loop and the second direct-cooling loop can be independently conducted to cool the battery and can also be conducted at the same time to jointly cool the battery, so that the direct-cooling temperature control of the battery is realized. A gradient cooling mode is formed under the condition that the first direct cooling loop and the second direct cooling loop are independently conducted and under the condition that the first direct cooling loop and the second direct cooling loop are both conducted. On the basis, the vehicle using scene information is used for controlling the specific cooling mode, that is, according to the direct cooling temperature control method of the battery provided by the embodiment of the invention, the direct cooling temperature control of the battery and the vehicle using scene are combined together, it is ensured that direct cooling of the battery can meet the working condition requirement of a vehicle where the battery is actually located, and the service life of the battery is prolonged. Therefore, the direct cooling effect on the battery is more effective, and the refrigerant transfer is more reasonable.

Description

Technical Field

[0001] The present application relates to the technical field of power batteries, and in particular to a direct cooling temperature control method, system, battery assembly and vehicle for a battery. Background Art

[0002] Direct cooling and heating of batteries is a widely used battery thermal management technology besides liquid cooling. Direct cooling uses the cooling principle of the refrigerant gas-liquid phase change, that is, it uses the process of the vehicle air-conditioning refrigerant boiling from liquid to gas to absorb the heat of the battery system, thereby achieving the purpose of cooling the battery system. During the phase change process, the fluid releases or absorbs latent heat of vaporization in a saturated state. The latent heat of vaporization of general substances is much greater than the sensible heat of a single phase, which can achieve efficient cooling of the battery.

[0003] The thermal process of the refrigerant in the cold plate is boiling forced convection heat transfer in the tube. Under ideal conditions where the pressure drop in the tube is ignored, the refrigerant pressure remains constant, and combined with the thermodynamic characteristics of the one-to-one correspondence between temperature and pressure in the two-phase region, the temperature will remain constant. In the actual heat transfer process, due to the existence of the cold plate pressure drop, the internal refrigerant temperature will gradually decrease along the process, reaching the lowest value at a certain point in the process until the temperature gradually rises after overheating. Usually, the temperature difference on the surface of the cold plate is greater than that of liquid cooling, so when designing a direct cooling solution, the battery temperature difference is not easy to control. Moreover, in actual applications, direct cooling and heating of batteries often only focus on the battery itself, while ignoring the environment in which the battery is located, which makes it difficult to predict the cooling needs of the battery. Summary of the invention

[0004] In view of this, the present application provides a direct cooling temperature control method, system, battery assembly and vehicle for a battery, with the aim of solving the above technical problems to a certain extent.

[0005] In a first aspect, the present application provides a direct cooling temperature control method for a battery, the direct cooling temperature control method comprising:

[0006] Provide a first direct cooling circuit and a second direct cooling circuit for the battery;

[0007] Obtain usage scenario information of the vehicle where the battery is located;

[0008] Determining the cooling requirement of the battery according to the vehicle usage scenario information;

[0009] According to the cooling demand, controlling only one of the first direct cooling circuit and the second direct cooling circuit to be turned on, or controlling both the first direct cooling circuit and the second direct cooling circuit to be turned on;

[0010] Among them, the vehicle usage scenario information includes one or more of the vehicle's charging status information, the vehicle's acceleration information, the vehicle's working environment information, and the vehicle's stop running time.

[0011] Preferably, determining the cooling requirement of the battery according to the vehicle usage scenario information includes:

[0012] The cooling demand of the battery is determined to be an immediate cooling demand based on the fact that the vehicle is in a fast charging state, based on the acceleration information of the vehicle characterizing that the vehicle is in an acceleration or deceleration state, or based on the working environment information of the vehicle and the vehicle stop running time characterizing that the vehicle has been in an environment above a predetermined temperature threshold for a predetermined time, and the immediate cooling demand characterizes that the battery requires both the first direct cooling circuit and the second direct cooling circuit to be turned on for cooling.

[0013] Preferably, determining the cooling demand of the battery according to the vehicle usage scenario information further comprises: according to the vehicle usage scenario information, taking the cooling demand of the battery represented by the remaining vehicle usage scenario information other than the vehicle usage scenario information corresponding to the immediate cooling demand as the determined cooling demand, and confirming the cooling power demand of the battery according to the determined cooling demand;

[0014] The controlling, according to the cooling demand, only one of the first direct cooling circuit and the second direct cooling circuit to be turned on, or controlling both the first direct cooling circuit and the second direct cooling circuit to be turned on also includes: comparing the cooling power demand with a predetermined cooling power threshold, and when the cooling power demand is not greater than the predetermined cooling power threshold, controlling only one of the first direct cooling circuit and the second direct cooling circuit to be turned on; when the cooling power demand is greater than the predetermined cooling power threshold, controlling both the first direct cooling circuit and the second direct cooling circuit to be turned on.

[0015] Preferably, the direct cooling temperature control method further comprises:

[0016] In response to both the first direct cooling circuit and the second direct cooling circuit being turned on, obtaining a temperature difference between the highest temperature and the lowest temperature inside the battery that is greater than a predetermined temperature difference threshold, and adjusting the cooling flow of the first direct cooling circuit and the second direct cooling circuit until the temperature difference is no greater than the predetermined temperature difference threshold.

[0017] Preferably, obtaining that the temperature difference between the maximum temperature and the minimum temperature inside the battery is greater than a predetermined temperature difference threshold comprises:

[0018] A higher temperature region and a lower temperature region are determined inside the battery, and temperature measuring points are set on the battery cells included in the higher temperature region to obtain the highest temperature, and temperature measuring points are set on the battery cells included in the lower temperature region to obtain the lowest temperature.

[0019] In a second aspect, the present application provides a direct cooling temperature control system for a battery, the direct cooling temperature control system comprising:

[0020] A cold plate, the cold plate comprising a first direct cooling circuit and a second direct cooling circuit arranged in the cold plate, the first direct cooling circuit comprising a plurality of first flow channel clusters, the first flow channel cluster comprising a plurality of flow channels, the second direct cooling circuit comprising a plurality of second flow channel clusters arranged in one-to-one correspondence with the first flow channel clusters, the second flow channel cluster comprising a plurality of the flow channels;

[0021] The first flow channel clusters and the second flow channel clusters both extend along a first direction and are alternately arranged along a second direction intersecting the first direction, and each of the first flow channel clusters corresponds to an adjacent second flow channel cluster;

[0022] The first flow channel cluster and the corresponding second flow channel cluster together form a cooling structure extending along the first direction, and the cooling structure is configured to exchange heat with a plurality of battery cells arranged along the first direction;

[0023] Wherein, the flow channels in the cooling structure include two types of flow channels having a first flow direction and a second flow direction, and the number of the flow channels having the first flow direction is the same as the number of the flow channels having the second flow direction;

[0024] The first direct cooling circuit and the second direct cooling circuit are connected to an external condenser of the vehicle, and one or both of the first direct cooling circuit and the second direct cooling circuit can be conducted.

[0025] Preferably, the direct cooling temperature control system further comprises:

[0026] A three-way valve, the three-way valve comprising a first interface, a second interface and a third interface, the first interface being connected to the external condenser, the second interface being connected to the first direct cooling circuit, the third interface being connected to the second direct cooling circuit, and the three-way valve being configured to enable the first interface to be connected to one or both of the second interface and the third interface;

[0027] A first return path and a second return path, wherein the first return path is connected to the first direct cooling circuit and the external condenser, and the second return path is connected to the second direct cooling circuit and the external condenser.

[0028] Preferably, the direct cooling temperature control system further comprises a first flow regulating valve and a second flow regulating valve, wherein the first flow regulating valve is arranged in the first return path to adjust the flow of the first direct cooling circuit, and the second flow regulating valve is arranged in the second return path to adjust the flow of the second direct cooling circuit;

[0029] The direct cooling temperature control system further includes a plurality of high temperature measuring point temperature sensors, which are arranged in a relatively high temperature area in the battery, and each high temperature measuring point temperature sensor is arranged on a corresponding battery cell, and the maximum temperature inside the battery is obtained by the plurality of high temperature measuring point temperature sensors;

[0030] The direct cooling temperature control system further includes a plurality of low temperature measuring point temperature sensors, which are arranged in a relatively low temperature area in the battery, and each low temperature measuring point temperature sensor is arranged on a corresponding battery cell, and the plurality of low temperature measuring point temperature sensors are used to obtain the lowest temperature inside the battery;

[0031] The first flow regulating valve and the second flow regulating valve respectively adjust the flow of the first direct cooling circuit and the flow of the second direct cooling circuit according to the temperature difference formed by the maximum temperature and the minimum temperature.

[0032] Preferably, the direct cooling temperature control system further includes a first temperature sensor and a second temperature sensor, and the first temperature sensor and the second temperature sensor are respectively arranged in the first return path and the second return path.

[0033] In a third aspect, the present application provides a battery assembly, which includes the direct cooling temperature control system for the battery as described above.

[0034] In a fourth aspect, the present application provides a vehicle, comprising the battery assembly as described above.

[0035] According to the direct cooling temperature control method of the battery provided in the embodiment of the present application, a first direct cooling circuit and a second direct cooling circuit are set for the battery. In the method, the first direct cooling circuit and the second direct cooling circuit can be turned on individually to cool the battery, and can also be turned on at the same time to cool the battery together. Therefore, the situation where the first direct cooling circuit and the second direct cooling circuit are turned on individually and the situation where both are turned on together form a gradient cooling method. On this basis, the specific cooling method is controlled based on the vehicle usage scenario information, that is, according to the direct cooling temperature control method of the battery provided in the embodiment of the present application, the direct cooling temperature control of the battery is combined with the vehicle usage scenario to ensure that the direct cooling of the battery can meet the working condition requirements of the vehicle in which the battery is actually located, thereby making the direct cooling effect of the battery more effective and the refrigerant mobilization more reasonable.

[0036] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 A schematic diagram of a cold plate provided according to an embodiment of the present application is shown;

[0039] Figure 2 A schematic diagram of a first direct cooling circuit of a cold plate provided according to an embodiment of the present application is shown;

[0040] Figure 3 A schematic diagram of a second direct cooling circuit of a cold plate provided according to an embodiment of the present application is shown;

[0041] Figure 4 A schematic diagram showing the refrigerant flow direction of a cold plate provided according to an embodiment of the present application is shown;

[0042] Figure 5 A schematic diagram of a direct cooling temperature control system for a battery provided in accordance with an embodiment of the present application is shown.

[0043] Reference numerals:

[0044] 100-cold plate; 110-first direct cooling circuit; 111-first flow channel cluster; 112-first direct cooling joint; 120-second direct cooling circuit; 121-second flow channel cluster; 122-second direct cooling joint; 200-first direction; 300-second direction;

[0045] 410 - compressor; 420 - external condenser; 430 - three-way valve; 440 - first flow regulating valve; 450 - second flow regulating valve; 460 - first temperature sensor; 470 - second temperature sensor; 480 - gas-liquid separator. DETAILED DESCRIPTION

[0046] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0047] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0048] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0049] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0050] According to a first aspect of an embodiment of the present application, a direct cooling temperature control method for a battery is provided, and the steps and working principle of the method will be described in detail below.

[0051] According to the direct cooling temperature control method of the battery provided in the embodiment of the present application, the direct cooling temperature control method includes: setting a first direct cooling loop 110 and a second direct cooling loop 120 for the battery; obtaining vehicle usage scenario information of the vehicle where the battery is located; determining the cooling requirement of the battery according to the vehicle usage scenario information; according to the cooling requirement, controlling only one of the first direct cooling loop 110 and the second direct cooling loop 120 to be turned on, or controlling both the first direct cooling loop 110 and the second direct cooling loop 120 to be turned on; wherein the vehicle usage scenario information includes one or more of the vehicle's charging status information, the vehicle's acceleration information, the vehicle's working environment information, and the vehicle's stop time.

[0052] In this way, according to the direct cooling temperature control method of the battery provided in the embodiment of the present application, a first direct cooling loop 110 and a second direct cooling loop 120 are set for the battery. In the method, the first direct cooling loop 110 and the second direct cooling loop 120 can be turned on individually to cool the battery, and can also be turned on at the same time to cool the battery together. Therefore, the situation where the first direct cooling loop 110 and the second direct cooling loop 120 are turned on individually and the situation where both are turned on together form a gradient cooling method. On this basis, the specific cooling method is controlled based on the vehicle usage scenario information, that is, according to the direct cooling temperature control method of the battery provided in the embodiment of the present application, the direct cooling temperature control of the battery is combined with the vehicle usage scenario to ensure that the direct cooling of the battery can meet the working condition requirements of the vehicle in which the battery is actually located, thereby making the direct cooling effect of the battery more effective and the refrigerant mobilization more reasonable.

[0053] In the embodiment, as an example, the battery mentioned above may be a power battery used in new energy vehicles.

[0054] In the embodiment, the vehicle usage scenario information should be understood to include the following meanings: information that can be obtained from the environment in which the vehicle is in use. In the embodiment, this information can be used to form feedback on the vehicle usage situation, so as to more accurately confirm the cooling requirements of the battery.

[0055] In the embodiment, the above-mentioned "vehicle charging status information" should be understood to include the following meanings: whether the vehicle is in a charging state. Because when the vehicle is in a charging state, the power battery will generate more heat as the charging proceeds. Here, more specifically, when the vehicle is in a fast charging state, the power battery will generate more heat in a short time.

[0056] In the embodiment, the "vehicle acceleration information" mentioned above should be understood to include the following meanings: the current situation of the vehicle represented by the vehicle acceleration. For example, when the vehicle acceleration is positive, the vehicle is accelerating, and when the vehicle acceleration is negative, the vehicle is decelerating, both of which will cause the heat generated by the battery to increase.

[0057] In the embodiment, the "vehicle working environment information" mentioned above should be understood to include the following meanings: the temperature of the environment in which the vehicle is located. In the embodiment, the physical quantity in the working environment of the vehicle that is most directly related to the temperature of the battery is the temperature of the working environment in which the vehicle is located. In addition, the "vehicle stop time" mentioned above should be understood to include the following meanings: the time the vehicle is parked in a shutdown state. Here, "vehicle stop time" and "vehicle working environment information" are often considered together, because when the working environment of the vehicle is a high-temperature environment, if the vehicle stops running for a long enough time, it will also cause the battery temperature to rise.

[0058] According to the direct cooling temperature control method provided in the embodiment of the present application, the step of determining the cooling requirement of the battery according to the vehicle usage scenario information may include:

[0059] The battery cooling demand is determined to be an immediate cooling demand based on the fact that the vehicle is in a fast charging state, based on the vehicle's acceleration information characterizing that the vehicle is in an acceleration or deceleration state, or based on the vehicle's working environment information and the vehicle's stop time characterizing that the vehicle has been in an environment above a predetermined temperature threshold for a predetermined time. The immediate cooling demand characterizes that the battery requires both the first direct cooling circuit 110 and the second direct cooling circuit 120 to be turned on for cooling.

[0060] As described in the above steps, when it is confirmed that the vehicle is in the above vehicle usage scenarios based on the vehicle usage scenario information, the direct cooling temperature control method can confirm that the battery has an immediate cooling demand with a higher cooling priority due to its high heat generation. In this cooling demand, it is not necessary to consider the quantitative analysis and judgment of the collected vehicle usage scenario information, and the battery can be directly cooled by turning on both the first direct cooling circuit 110 and the second direct cooling circuit 120 to ensure that the battery temperature can be effectively controlled.

[0061] In an embodiment, the acceleration or deceleration state of the vehicle confirmed based on the acceleration information of the vehicle may be a pre-set rapid acceleration or rapid deceleration state. In an embodiment, the acceleration information may be obtained through an acceleration sensor disposed in the vehicle, and the acceleration threshold of rapid acceleration and the acceleration threshold of rapid deceleration may be pre-set in the vehicle's main control system. When the vehicle acceleration exceeds the acceleration threshold of rapid acceleration, the vehicle is considered to be rapidly accelerating, and when the vehicle acceleration is less than the acceleration threshold of rapid deceleration (because the acceleration is negative during deceleration, in essence, the absolute value of the vehicle's acceleration under this condition is greater than the absolute value of the acceleration threshold of rapid deceleration), the vehicle is considered to be rapidly decelerating.

[0062] According to the direct cooling temperature control method provided in the embodiment of the present application, in the embodiment, the step of determining the cooling demand of the battery according to the vehicle usage scenario information may also include: according to the vehicle usage scenario information, the cooling demand of the battery represented by the remaining vehicle usage scenario information other than the vehicle usage scenario information corresponding to the immediate cooling demand is determined as the cooling demand, and the cooling power demand of the battery is confirmed according to the determined cooling demand.

[0063] That is to say, the vehicle usage scenario information includes the vehicle usage scenario information corresponding to the immediate cooling demand mentioned in the above description, and also includes the remaining vehicle usage scenario information. The cooling demand of the battery corresponding to the remaining vehicle usage scenario information is determined as the determined cooling demand. That is to say, under the remaining vehicle usage scenario information, the specific cooling method required for the battery needs to be determined based on the vehicle usage scenario information. The specific determination method is to use the determined cooling demand to confirm the cooling power requirement of the battery, that is, to quantify the vehicle usage scenario information into the cooling power required for the battery.

[0064] In an embodiment, the vehicle operation simulation can be performed to obtain the heating conditions of the battery when the vehicle is not in a state of rapid acceleration or deceleration, when the vehicle is in a normal temperature working state below a predetermined temperature threshold, and when the vehicle is not in a charging state. Thus, based on the simulation structure, the cooling power requirements of the battery under the dimensions of multiple vehicle usage scenario information can be obtained and then stored in the vehicle's main control system.

[0065] In an embodiment, according to the cooling demand, only one of the first direct cooling loop 110 and the second direct cooling loop 120 is controlled to be turned on, or both of the first direct cooling loop 110 and the second direct cooling loop 120 are controlled to be turned on. This step may also include: comparing the cooling power demand with a predetermined cooling power threshold, when the cooling power demand is not greater than the predetermined cooling power threshold, controlling only one of the first direct cooling loop 110 and the second direct cooling loop 120 to be turned on; when the cooling power demand is greater than the predetermined cooling power threshold, controlling both of the first direct cooling loop 110 and the second direct cooling loop 120 to be turned on. As an example, the predetermined cooling power threshold here may be, for example, 3kW / s, that is, when the cooling power demand is high, two direct cooling loops are used for cooling, and when it is low, one of the direct cooling loops is used for cooling.

[0066] According to the direct cooling temperature control method provided in the embodiment of the present application, the direct cooling temperature control method may further include:

[0067] In response to the first direct cooling circuit 110 and the second direct cooling circuit 120 both being turned on, the temperature difference between the highest temperature and the lowest temperature inside the battery is obtained to be greater than a predetermined temperature difference threshold, and the cooling flow of the first direct cooling circuit 110 and the second direct cooling circuit 120 is adjusted until the temperature difference is no greater than the predetermined temperature difference threshold.

[0068] In an embodiment, when both direct cooling circuits are turned on, it means that the cooling demand of the current battery is high and the heat generation is large. In this case, a large temperature difference will occur inside the battery. A large temperature difference inside the battery is not conducive to the life of the battery. Therefore, in an embodiment, by adjusting the flow rate of the two direct cooling circuits to form different flow ratios, the temperature difference inside the battery gradually becomes less than the predetermined temperature difference threshold, that is, by adjusting the flow ratio of the two direct cooling circuits, the temperature equalization process inside the battery is achieved.

[0069] According to the direct cooling temperature control method provided in the embodiment of the present application, the step of obtaining that the temperature difference between the maximum temperature and the minimum temperature inside the battery is greater than a predetermined temperature difference threshold may include:

[0070] A higher temperature region and a lower temperature region are determined inside the battery, and temperature measuring points are set on the battery cells included in the higher temperature region to obtain the highest temperature, and temperature measuring points are set on the battery cells included in the lower temperature region to obtain the lowest temperature.

[0071] In an embodiment, the simulation software can be used to confirm in advance the areas where the battery generates more heat and the areas where the battery generates less heat during operation of the vehicle, and then based on the division of the areas, the higher temperature areas and lower temperature areas as above are delineated inside the battery. Then, multiple temperature measurement points are set in the corresponding areas, and the maximum and minimum temperatures inside the battery are respectively confirmed based on the extreme values ​​of the multiple temperatures fed back by the multiple temperature measurement points in the individual areas, that is, the maximum value for the higher temperature area and the minimum value for the lower temperature area, so as to confirm the temperature difference. This method of confirming the temperature difference is accurate, reliable and effective.

[0072] In a more specific example, the temperature measuring point can be set on the battery cell, or between adjacent battery cells. In the embodiment of the present application, considering the direct heat generation of the battery cell, the temperature measuring point can be set on the battery cell.

[0073] According to a second aspect of an embodiment of the present application, a direct cooling temperature control system for a battery is provided. The direct cooling temperature control system can be used to implement the direct cooling temperature control method as described above. Figures 1 to 5 The structure and working principle of the direct cooling temperature control system are described in detail.

[0074] In an embodiment, the direct cooling temperature control system includes a cold plate 100. The cold plate 100 includes a first direct cooling loop 110 and a second direct cooling loop 120 disposed in the cold plate 100, the first direct cooling loop 110 includes a plurality of first flow channel clusters 111, the first flow channel cluster 111 includes a plurality of flow channels, the second direct cooling loop 120 includes a plurality of second flow channel clusters 121 disposed one-to-one corresponding to the first flow channel clusters 111, the second flow channel cluster 121 includes a plurality of flow channels.

[0075] In the embodiment, the first flow channel cluster 111 and the second flow channel cluster 121 both extend along the first direction 200 and are alternately arranged along the second direction 300 intersecting the first direction 200, and each first flow channel cluster 111 corresponds to an adjacent second flow channel cluster 121. The first flow channel cluster 111 and the corresponding second flow channel cluster 121 together form a cooling structure extending along the first direction 200, and the cooling structure is configured to exchange heat with a plurality of battery cells arranged along the first direction 200.

[0076] In an embodiment, the flow channels in the cooling structure include two types of flow channels having a first flow direction and a second flow direction, the number of flow channels having the first flow direction is the same as the number of flow channels having the second flow direction, the first direct cooling circuit 110 and the second direct cooling circuit 120 are connected to the vehicle's outdoor condenser 420, and one or both of the first direct cooling circuit 110 and the second direct cooling circuit 120 can be connected.

[0077] In this way, according to the direct cooling temperature control system provided in the embodiment of the present application, when the first direct cooling circuit 110 and the second direct cooling circuit 120 are both turned on, since the number of two flow channels with opposite flow directions in the cooling structure is the same, the arrangement of the two flow channels in the cooling structure when cooling the battery cell is uniform, thereby making it easier to achieve uniform control of the refrigerant inside the battery through the cooling structure, so that the battery can achieve uniform temperature more quickly.

[0078] Combination Figures 1 to 4 In an embodiment, the first direct cooling loop 110 and the second direct cooling loop 120 are integrated into the cold plate 100. Figure 2 and Figure 3 , Figure 2 and Figure 3 The first direct cooling loop 110 and the second direct cooling loop 120 are shown respectively. As mentioned in the above description, the alternating arrangement of the first flow channel clusters 111 and the second flow channel clusters 121 realizes the high-density integration of the first direct cooling loop 110 and the second direct cooling loop 120.

[0079] In the embodiment, taking the first direct cooling loop 110 as an example, the first direct cooling loop 110 has two parallel large paths, and the large path extends in a "U" shape. In the large path, a flow channel flowing to the end of the large path and a flow channel flowing back from the end of the large path to the first direct cooling joint 112 of the first direct cooling loop 110 are included. The "U"-shaped large path defines a space between the two first flow channel clusters 111, and this space is used to arrange a second flow channel cluster 121, and then from top to bottom, the first flow channel cluster 111 and the second flow channel cluster 121 below form a cooling structure.

[0080] In the embodiment, the second direct cooling loop 120 is extended in a similar manner to the first direct cooling loop 110 and also has a second direct cooling joint 122 , and the description of its structure is not repeated here.

[0081] In addition, in the embodiment, the first direct cooling circuit 110 and the second direct cooling circuit 120 are connected to the vehicle exterior condenser 420 , and the refrigerant flowing therein is the refrigerant in the vehicle air conditioning cycle.

[0082] In addition, the first direction 200 and the second direction 300 mentioned in the above description may be perpendicular to each other, the first direction 200 is the horizontal direction in the figure, and the second direction 300 is the vertical direction in the figure.

[0083] In addition, in the embodiment, the first flow direction may be, for example, the flow direction from left to right in the figure, and the second flow direction may be, for example, the flow direction from right to left in the figure. Figures 1 to 4 Each flow channel is represented as a line extending in the horizontal direction.

[0084] In an embodiment, the first direct cooling circuit 110 and the second direct cooling circuit 120 as mentioned above are not connected to each other, and thus the flow rate can be adjusted independently. The two essentially form a partitioned cross-type direct cooling channel, and the cooling structure formed by the first channel cluster 111 and the second channel cluster 121 of the two can be set at the bottom of the battery cell.

[0085] According to the direct cooling temperature control system provided in the embodiment of the present application, the direct cooling temperature control system may further include a three-way valve 430, a first reflux path and a second reflux path. Figure 5 The three-way valve 430 includes a first interface, a second interface and a third interface, the first interface is connected to the vehicle external condenser 420, the second interface is connected to the first direct cooling circuit 110, and the third interface is connected to the second direct cooling circuit 120. The three-way valve 430 is configured to enable the first interface to be connected to one or both of the second interface and the third interface. The first return path can connect the first direct cooling circuit 110 and the vehicle external condenser 420, and the second return path can connect the second direct cooling circuit 120 and the vehicle external condenser 420.

[0086] In an embodiment, the direct cooling temperature control system may further include a compressor 410 and a gas-liquid separator 480, wherein the first return path and the second return path may converge into the gas-liquid separator 480, and then the refrigerant flowing out of the gas-liquid separator 480 may flow into the compressor 410, and then the compressor 410 may supply the external condenser 420.

[0087] According to the direct cooling temperature control system provided in the embodiment of the present application, the direct cooling temperature control system may also include a first flow regulating valve 440 and a second flow regulating valve 450. The first flow regulating valve 440 may be arranged in the first return path to adjust the flow of the first direct cooling circuit 110, and the second flow regulating valve 450 may be arranged in the second return path to adjust the flow of the second direct cooling circuit 120.

[0088] In an embodiment, the direct cooling temperature control system may further include a plurality of high-temperature measuring point temperature sensors, which may be arranged in a higher temperature area within the battery, and each high-temperature measuring point temperature sensor may be arranged on a corresponding battery cell, and the maximum internal temperature of the battery may be obtained by the plurality of high-temperature measuring point temperature sensors.

[0089] In an embodiment, the direct cooling temperature control system may also include multiple low-temperature measurement point temperature sensors, which can be arranged in a lower temperature area inside the battery. Each low-temperature measurement point temperature sensor can be arranged on a corresponding battery cell, and the lowest internal temperature of the battery is obtained by the multiple low-temperature measurement point temperature sensors.

[0090] In an embodiment, the first flow regulating valve 440 and the second flow regulating valve 450 can respectively adjust the flow of the first direct cooling loop 110 and the flow of the second direct cooling loop 120 according to the temperature difference formed by the maximum temperature and the minimum temperature.

[0091] In an embodiment, the arrangement of the direct cooling temperature control system here can be used to implement the temperature adjustment process of the first direct cooling loop 110 and the second direct cooling loop 120 in the above control method. Figure 5 Specifically, the first flow regulating valve 440 and the second flow regulating valve 450 can be specifically formed as a first expansion valve and a second expansion valve. In an embodiment, the temperature difference can be received by the main control system of the vehicle and compared with the pre-stored temperature difference threshold. Once the temperature difference exceeds the threshold, the first flow regulating valve 440 and the second flow regulating valve 450 are controlled to adjust the flow of the refrigerant in their respective circuits to achieve the purpose of temperature equalization. If the temperature difference does not exceed the threshold, the temperature equalization mode can be exited and one of the two direct cooling circuits can be closed.

[0092] According to the direct cooling temperature control system provided in the embodiment of the present application, the direct cooling temperature control system further includes a first temperature sensor 460 and a second temperature sensor 470, which can be respectively arranged in the first return path and the second return path. The first temperature sensor 460 and the second temperature sensor 470 can be connected to the main control system of the vehicle in communication to detect the temperature of the first return path and the second return path. Two corresponding temperature thresholds can be respectively set in the main control system. If the temperature of the first return path and the second return path exceeds the corresponding threshold, the main control system determines that the direct cooling temperature control system is abnormal, and the main control system issues an alarm.

[0093] According to the direct cooling temperature control method and system provided in the embodiment of the present application, a dual refrigerant circuit direct cooling plate 100 solution is designed to realize independent control of the dual-circuit refrigerant flow, and can open and close the flow channels on one side or both sides according to the cooling and heating requirements of the system, while ensuring the temperature uniformity of the system. The zone control of the refrigerant flow in the cold plate 100 is realized, the refrigerant process is shortened, and the purpose of improving the refrigerant temperature uniformity is achieved, which can realize effective temperature control of the battery.

[0094] According to a third aspect of an embodiment of the present application, a battery assembly is provided. The battery assembly includes a direct cooling temperature control system for the battery as above, and may also include a power battery. The beneficial effects will not be repeated here.

[0095] According to a fourth aspect of an embodiment of the present application, a vehicle is provided, the vehicle comprising a battery assembly as above, and the beneficial effects are not repeated here.

[0096] The above are only preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. All equivalent structural changes made by using the contents of the present application specification and drawings under the innovative concept of the present application, or directly / indirectly applied in other related technical fields are included in the protection scope of the present application.

Claims

1. A direct cooling temperature control method for a battery, characterized in that: The direct cooling temperature control method comprises: Provide a first direct cooling circuit and a second direct cooling circuit for the battery; Obtain usage scenario information of the vehicle where the battery is located; Determining the cooling requirement of the battery according to the vehicle usage scenario information; According to the cooling demand, controlling only one of the first direct cooling circuit and the second direct cooling circuit to be turned on, or controlling both the first direct cooling circuit and the second direct cooling circuit to be turned on; Among them, the vehicle usage scenario information includes one or more of the vehicle's charging status information, the vehicle's acceleration information, the vehicle's working environment information, and the vehicle's stop running time.

2. The direct cooling temperature control method according to claim 1, characterized in that: The determining the cooling requirement of the battery according to the vehicle usage scenario information includes: The cooling demand of the battery is determined to be an immediate cooling demand based on the fact that the vehicle is in a fast charging state, based on the acceleration information of the vehicle characterizing that the vehicle is in an acceleration or deceleration state, or based on the working environment information of the vehicle and the vehicle stop running time characterizing that the vehicle has been in an environment above a predetermined temperature threshold for a predetermined time, and the immediate cooling demand characterizes that the battery requires both the first direct cooling circuit and the second direct cooling circuit to be turned on for cooling.

3. The direct cooling temperature control method according to claim 2, characterized in that: The determining the cooling demand of the battery according to the vehicle usage scenario information further includes: according to the vehicle usage scenario information, taking the cooling demand of the battery represented by the remaining vehicle usage scenario information other than the vehicle usage scenario information corresponding to the immediate cooling demand as the determined cooling demand, and confirming the cooling power demand of the battery according to the determined cooling demand; The controlling, according to the cooling demand, only one of the first direct cooling circuit and the second direct cooling circuit to be turned on, or controlling both the first direct cooling circuit and the second direct cooling circuit to be turned on also includes: comparing the cooling power demand with a predetermined cooling power threshold, and when the cooling power demand is not greater than the predetermined cooling power threshold, controlling only one of the first direct cooling circuit and the second direct cooling circuit to be turned on; when the cooling power demand is greater than the predetermined cooling power threshold, controlling both the first direct cooling circuit and the second direct cooling circuit to be turned on.

4. The direct cooling temperature control method according to claim 1, characterized in that: The direct cooling temperature control method also includes: In response to both the first direct cooling circuit and the second direct cooling circuit being turned on, obtaining a temperature difference between the highest temperature and the lowest temperature inside the battery that is greater than a predetermined temperature difference threshold, and adjusting the cooling flow of the first direct cooling circuit and the second direct cooling circuit until the temperature difference is no greater than the predetermined temperature difference threshold.

5. The direct cooling temperature control method according to claim 4, characterized in that: The obtaining that the temperature difference between the maximum temperature and the minimum temperature inside the battery is greater than a predetermined temperature difference threshold comprises: A higher temperature region and a lower temperature region are determined inside the battery, and temperature measuring points are set on the battery cells included in the higher temperature region to obtain the highest temperature, and temperature measuring points are set on the battery cells included in the lower temperature region to obtain the lowest temperature.

6. A direct cooling temperature control system for a battery, characterized in that: The direct cooling temperature control system comprises: A cold plate, the cold plate comprising a first direct cooling circuit and a second direct cooling circuit arranged in the cold plate, the first direct cooling circuit comprising a plurality of first flow channel clusters, the first flow channel cluster comprising a plurality of flow channels, the second direct cooling circuit comprising a plurality of second flow channel clusters arranged in one-to-one correspondence with the first flow channel clusters, the second flow channel cluster comprising a plurality of the flow channels; The first flow channel clusters and the second flow channel clusters both extend along a first direction and are alternately arranged along a second direction intersecting the first direction, and each of the first flow channel clusters corresponds to an adjacent second flow channel cluster; The first flow channel cluster and the corresponding second flow channel cluster together form a cooling structure extending along the first direction, and the cooling structure is configured to exchange heat with a plurality of battery cells arranged along the first direction; Wherein, the flow channels in the cooling structure include two types of flow channels having a first flow direction and a second flow direction, and the number of the flow channels having the first flow direction is the same as the number of the flow channels having the second flow direction; The first direct cooling circuit and the second direct cooling circuit are connected to an external condenser of the vehicle, and one or both of the first direct cooling circuit and the second direct cooling circuit can be conducted.

7. The direct cooling temperature control system according to claim 6, characterized in that: The direct cooling temperature control system also includes: A three-way valve, the three-way valve comprising a first interface, a second interface and a third interface, the first interface being connected to the external condenser, the second interface being connected to the first direct cooling circuit, the third interface being connected to the second direct cooling circuit, and the three-way valve being configured to enable the first interface to be connected to one or both of the second interface and the third interface; A first return path and a second return path, wherein the first return path is connected to the first direct cooling circuit and the external condenser, and the second return path is connected to the second direct cooling circuit and the external condenser.

8. The direct cooling temperature control system according to claim 7, characterized in that: The direct cooling temperature control system further includes a first flow regulating valve and a second flow regulating valve, wherein the first flow regulating valve is arranged in the first return path to adjust the flow of the first direct cooling circuit, and the second flow regulating valve is arranged in the second return path to adjust the flow of the second direct cooling circuit; The direct cooling temperature control system further includes a plurality of high temperature measuring point temperature sensors, which are arranged in a relatively high temperature area in the battery, and each high temperature measuring point temperature sensor is arranged on a corresponding battery cell, and the maximum temperature inside the battery is obtained by the plurality of high temperature measuring point temperature sensors; The direct cooling temperature control system further includes a plurality of low temperature measuring point temperature sensors, which are arranged in a relatively low temperature area in the battery, and each low temperature measuring point temperature sensor is arranged on a corresponding battery cell, and the plurality of low temperature measuring point temperature sensors are used to obtain the lowest temperature inside the battery; The first flow regulating valve and the second flow regulating valve respectively adjust the flow of the first direct cooling circuit and the flow of the second direct cooling circuit according to the temperature difference formed by the maximum temperature and the minimum temperature.

9. The direct cooling temperature control system according to claim 7, characterized in that: The direct cooling temperature control system further includes a first temperature sensor and a second temperature sensor, wherein the first temperature sensor and the second temperature sensor are respectively arranged in the first return path and the second return path.

10. A battery assembly, characterized in that: The battery assembly includes a direct cooling temperature control system for a battery as claimed in any one of claims 6 to 9.

11. A vehicle, characterized in that: The vehicle includes the battery assembly of claim 10.

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