Heat exchange devices and energy storage equipment

Abstract

A heat exchange device and energy storage equipment are disclosed. The heat exchange device includes a liquid chiller and a piping assembly. The piping assembly is connected to the liquid chiller and delivers coolant to a battery pack. The piping assembly includes a primary piping, a secondary piping, a first valve, a first flow meter, and a second flow meter. The primary piping is connected to the liquid chiller and the secondary piping. The secondary piping is connected to a tertiary piping and also connects to the battery pack for heat exchange. The first valve is connected to the secondary piping. The first flow meter is connected to the primary piping and detects its first flow rate. The second flow meter is connected to the secondary piping and detects its second flow rate. The first valve controls the first opening degree of the secondary piping, thereby improving the accuracy of coolant flow rate control in the heat exchange device.

Description

Technical Field

[0001] This utility model relates to the field of energy storage technology, specifically to a heat exchange device and energy storage equipment. Background Technology

[0002] Currently, in energy storage devices, heat exchangers are used to heat the battery clusters to ensure stable operation at suitable temperatures. Existing technologies use pipes of varying inner diameters in the heat exchanger to alter the heat exchange effect on the battery clusters. However, this approach cannot accurately adapt to the varying heat dissipation requirements of the battery clusters under changing operating conditions. This single control method results in low precision, impacting the heat dissipation efficiency and safety of the battery clusters. Utility Model Content

[0003] The purpose of this invention is to provide a heat exchange device and energy storage equipment, which improves the problem of low accuracy in regulating the flow rate of the coolant in the heat exchange device.

[0004] To achieve the objectives of this utility model, the following technical solution is provided: In a first aspect, this utility model provides a heat exchange device applied to a battery cluster, the battery cluster comprising a plurality of battery packs arranged sequentially at intervals. The heat exchange device includes: a liquid cooler unit; and a pipeline assembly connected to the liquid cooler unit. The pipeline assembly is used to transport coolant to the battery packs. The pipeline assembly includes a primary pipeline, a secondary pipeline, a first valve, a first flow meter, and a second flow meter. The primary pipeline is connected to the liquid cooler unit and the secondary pipeline. The secondary pipeline is also connected to the battery pack and exchanges heat with the battery pack. The first valve is connected to the secondary pipeline. The first flow meter is connected to the inlet end of the primary pipeline. The second flow meter is connected to the inlet end of the secondary pipeline. The first valve is used to control a first opening degree of the secondary pipeline. The first flow meter is used to detect a first flow rate of the coolant in the primary pipeline. The second flow meter is used to detect a second flow rate of the coolant in the secondary pipeline.

[0005] It is understandable that the first flow meter and the second flow meter detect the total flow of the primary pipeline and the total flow of the branches of the secondary pipeline, respectively. Through the pipeline settings of the primary and secondary pipelines and the independent adjustment of the first and second valves, the flow can be accurately matched for at least one battery pack, avoiding energy waste caused by excessive local flow or overheating risk caused by insufficient flow, thus improving the detection accuracy and adjustment accuracy of the coolant flow of the pipeline components.

[0006] In one embodiment, the piping assembly further includes a tertiary piping system, a second valve, and a third flow meter. The tertiary piping system is connected to the secondary piping system and is also connected to the battery pack for heat exchange. The second valve is connected to the tertiary piping system, and the third flow meter is connected to the tertiary piping system. The second valve is used to control a second opening degree of the tertiary piping system, and the third flow meter is used to detect a third flow rate of the coolant in the tertiary piping system.

[0007] It is understood that the piping assembly also includes a tertiary piping system, a second valve, and a third flow meter. The tertiary piping system connects to the secondary piping system and also connects to the battery pack for heat exchange. The second valve and the third flow meter are connected to the tertiary piping system. The second valve controls the second opening of the tertiary piping system, and the third flow meter detects the third flow rate of the coolant in the tertiary piping system. The third flow meter also detects the branch flow rates of the tertiary piping system. Through the piping setup of the tertiary piping system and the adjustment of the second valve, the flow rate can be precisely matched for at least one battery pack, avoiding energy waste caused by excessive local flow or overheating risk caused by insufficient flow. This further improves the accuracy of coolant flow rate detection and adjustment in the piping assembly.

[0008] In one embodiment, the piping assembly further includes a controller and a first temperature sensor. The first temperature sensor is connected to the water inlet of the primary piping. The controller is electrically connected to the liquid chiller, the first temperature sensor, the first flow meter, the second flow meter, the third flow meter, the first valve, and the second valve. The first temperature sensor is used to detect a first temperature of the coolant in the primary piping. The controller is used to control the first valve to adjust its first opening degree and / or control the second valve to adjust its second opening degree based on the first temperature, the first flow rate, the second flow rate, and the third flow rate.

[0009] It is understandable that the controller can achieve dynamic linkage adjustment of temperature and coolant flow in pipeline components without manual intervention. When dealing with scenarios such as battery pack charging and discharging and changes in ambient temperature, it shortens the response time, avoids temperature overshoot caused by lag in manual adjustment, and greatly improves the operational stability and adjustment efficiency of the heat exchange device.

[0010] In one embodiment, the piping assembly further includes a first pressure sensor connected to the inlet end of the primary piping and electrically connected to the controller. The first pressure sensor is used to detect a first pressure of the coolant in the primary piping. When the first pressure sensor detects that the first pressure is greater than a first preset pressure value, the controller controls the first valve to increase the first opening degree and / or controls the second valve to increase the second opening degree until the first pressure is less than or equal to the first preset pressure value.

[0011] It is understandable that by real-time detection of the initial pressure and automatic overpressure adjustment, pipe bursts caused by excessive pressure can be avoided, reducing the failure rate of the pipeline. At the same time, the liquid cooling unit can be protected from long-term overpressure operation and damage. Increasing the valve opening can both relieve pressure and increase the flow rate, quickly adjusting the excessive initial pressure and preventing permanent pipeline damage caused by excessive initial pressure. Moreover, through the coordinated adjustment between the initial pressure and the flow rate, the problem of increased initial pressure and decreased flow rate caused by pipeline blockage can be improved, preventing interruption of battery pack heat exchange due to excessive initial pressure.

[0012] In one embodiment, the piping assembly further includes a second temperature sensor connected to the tertiary piping and electrically connected to the controller. The second temperature sensor is used to detect a second temperature of the coolant in the tertiary piping. When the second temperature sensor detects that the second temperature is greater than a first preset temperature value, the controller controls the first valve to increase the first opening degree and / or controls the second valve to increase the second opening degree until the second temperature is less than or equal to the first preset temperature value.

[0013] It is understandable that by detecting the temperature of the three-stage pipeline, which reflects the heat dissipation effect of the battery pack, the actual operating temperature of each battery pack is kept within a safe range, thus improving the accuracy of temperature detection of the battery pack. The controller can quickly adjust the flow rate of the three-stage pipeline to avoid thermal runaway of the battery pack, thereby improving the accuracy and efficiency of adjusting the flow rate to change the temperature of the battery pack.

[0014] In one embodiment, the primary pipeline includes a first section and a second section, and the secondary pipeline includes a third section and a fourth section. One end of the first section is connected to the liquid chiller unit, the other end of the first section is connected to one end of the third section, the other end of the third section is connected to one end of the tertiary pipeline, the other end of the tertiary pipeline is connected to one end of the fourth section, the other end of the fourth section is connected to one end of the second section, and the other end of the second section is connected to the liquid chiller unit.

[0015] It is understandable that when a fault occurs in one of the first, second, third, or fourth segments, repairs can be carried out by isolating the segments without shutting down the entire system, thus avoiding the interruption of heat exchange for the entire battery cluster due to a single segment failure.

[0016] In one embodiment, the first valve is disposed in the fourth section; and / or, the first flow meter is disposed in the first section; and / or, the second flow meter is disposed in the third section.

[0017] It's understandable that installing the first valve in the fourth stage improves control accuracy; installing the first flow meter in the first stage avoids the impact of temperature changes on detection, thus improving detection accuracy; and installing the second flow meter in the third stage avoids fluctuations in return water mixing, improving data stability. Because the first valve is in the fourth stage, closing the valve during maintenance can cut off the secondary pipeline without affecting the operation of the primary pipeline and other secondary pipelines; the first flow meter is in the first stage, so no other components need to be disassembled during commissioning; and the second flow meter in the third stage allows for quick comparison of the difference with the first flow meter to determine if there is a leak in the secondary pipeline, improving troubleshooting efficiency and enhancing the accuracy of flow control.

[0018] In one embodiment, the number of the three-stage pipelines is multiple, and the multiple three-stage pipelines are spaced apart along the length direction of the battery cluster; or, the multiple three-stage pipelines are spaced apart along the width direction of the battery cluster.

[0019] It is understandable that by adapting the quantity and selecting the direction, it is ensured that each battery pack can be covered by at least one tertiary pipeline, avoiding the overheating problem of the edge battery packs caused by the traditional single pipeline covering multiple battery packs. Moreover, the spacing direction can be selected according to the actual layout of the battery cluster, and it can simultaneously adapt to the design scheme of multiple battery clusters. In addition, the parallel setting of multiple tertiary pipelines can evenly distribute the total heat load of the battery cluster to each tertiary pipeline, reducing the load of a single tertiary pipeline.

[0020] In one embodiment, the first valve is a solenoid valve; and / or, the second valve is a butterfly valve; and / or, the third flow meter is an ultrasonic flow meter.

[0021] It is understandable that solenoid valves have a fast response time and can quickly respond to flow fluctuations; butterfly valves have a wide adjustment range and can accurately match different heat load requirements. Moreover, butterfly valves are small in size, reducing the space occupied; ultrasonic flow meters do not require conductive coolant, can be adapted to a variety of coolants, and can meet the needs of different energy storage scenarios.

[0022] Secondly, this utility model also provides an energy storage device, including a battery cluster and a heat exchange device as described in the first aspect, wherein the heat exchange device is connected to the battery cluster and is used to exchange heat with the battery cluster. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a first structural schematic diagram of an energy storage device according to one embodiment; Figure 2 This is a schematic diagram of the second structure of an energy storage device according to one embodiment; Figure 3 This is a side view of an energy storage device according to one embodiment.

[0025] Explanation of reference numerals in the attached figures: 10-Energy storage equipment, 11-Heat exchange device, 12-Pipeline assembly, 121-Primary pipeline, 122-Secondary pipeline, 123-Tertiary pipeline, 124-First valve, 125-Second valve, 126-First flow meter, 127-Second flow meter, 128-Third flow meter, 129-First temperature sensor, 130-First pressure sensor, 131-Second temperature sensor, 14-Battery pack, 15-Liquid cooling unit. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] It should be noted that when a component is said to be "fixed" to another component, it can be directly on the other component or it can be in a middle component. When a component is said to be "connected" to another component, it can be directly connected to the other component or it may be in a middle component.

[0028] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used in this invention includes any and all combinations of one or more of the associated listed items.

[0029] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0030] Please refer to Figure 1 , Figure 2 and Figure 3This utility model embodiment provides a heat exchange device 11, which is applied to a battery cluster. The battery cluster includes a plurality of battery packs 14 arranged sequentially at intervals. The heat exchange device 11 includes a liquid cooling unit 15 and a pipeline assembly 12.

[0031] Piping assembly 12 is connected to liquid cooling unit 15 and is used to deliver coolant to battery pack 14. Piping assembly 12 includes primary pipeline 121, secondary pipeline 122, first valve 124, first flow meter 126, and second flow meter 127. Primary pipeline 121 is connected to liquid cooling unit 15 and secondary pipeline 122. Secondary pipeline 122 is also connected to battery pack 14 and exchanges heat with battery pack 14. First valve 124 is connected to secondary pipeline 122. First flow meter 126 is connected to the inlet of primary pipeline 121. Second flow meter 127 is connected to the inlet of secondary pipeline 122. First valve 124 is used to control the first opening degree of secondary pipeline 122. First flow meter 126 is used to detect the first flow rate of coolant in primary pipeline 121. Second flow meter 127 is used to detect the second flow rate of coolant in secondary pipeline 122.

[0032] Optionally, the inner diameter of the primary pipeline 121 is larger than the inner diameter of the secondary pipeline 122, and the inner diameter of the secondary pipeline 122 is larger than the inner diameter of the tertiary pipeline 123.

[0033] Optionally, when the liquid-cooled unit 15 is first started, the first opening degree and the second opening degree are adjusted to be the same.

[0034] Optionally, when the battery cluster includes multiple battery packs 14, and the temperature difference between the battery clusters is greater than a first temperature difference value, the first opening degree is increased; when the temperature difference between the battery clusters is less than or equal to the first temperature difference value, the second opening degree is adjusted.

[0035] It is understood that the first flow meter 126 and the second flow meter 127 respectively detect the total flow of the primary pipeline 121 and the total flow of the branch of the secondary pipeline 122. Through the pipeline settings of the primary pipeline 121 and the secondary pipeline 122 and the independent adjustment of the first valve 124, the flow can be accurately matched for at least one battery pack 14, avoiding energy waste caused by excessive local flow or overheating risk caused by insufficient flow, thus improving the detection accuracy and adjustment accuracy of the coolant flow of the pipeline assembly 12.

[0036] In one implementation method, please refer to Figure 1 , Figure 2 and Figure 3The piping assembly 12 also includes a tertiary piping 123, a second valve 125, and a third flow meter 128. The tertiary piping 123 is connected to the secondary piping 122 and is also connected to the battery pack 14 and exchanges heat with the battery pack 14. The second valve 125 is connected to the tertiary piping 123, and the third flow meter 128 is connected to the tertiary piping 123. The second valve 125 is used to control the second opening degree of the tertiary piping 123, and the third flow meter 128 is used to detect the third flow rate of the coolant in the tertiary piping 123.

[0037] It is understood that the piping assembly 12 also includes a tertiary piping 123, a second valve 125, and a third flow meter 128. The tertiary piping 123 is connected to the secondary piping 122 and is also connected to the battery pack 14 and exchanges heat with the battery pack 14. The second valve 125 is connected to the tertiary piping 123, and the third flow meter 128 is connected to the tertiary piping 123. The second valve 125 is used to control the second opening of the tertiary piping 123, and the third flow meter 128 is used to detect the third flow rate of the coolant in the tertiary piping 123. The third flow meter 128 detects the branch flow rate of the tertiary piping 123. Through the piping setup of the tertiary piping 123 and the adjustment of the second valve 125, the flow rate can be accurately matched for at least one battery pack 14, avoiding energy waste caused by excessive local flow or overheating risk caused by insufficient flow, and further improving the detection accuracy and adjustment accuracy of the coolant flow rate of the piping assembly 12.

[0038] In one implementation method, please refer to Figure 1 , Figure 2 and Figure 3 The piping assembly 12 also includes a controller and a first temperature sensor 129. The first temperature sensor 129 is connected to the water inlet of the primary piping 121. The controller is electrically connected to the liquid cooling unit 15, the first temperature sensor 129, the first flow meter 126, the second flow meter 127, the third flow meter 128, the first valve 124, and the second valve 125. The first temperature sensor 129 is used to detect the first temperature of the coolant in the primary piping 121. The controller is used to control the first valve 124 to adjust the first opening degree and / or control the second valve 125 to adjust the second opening degree according to the first temperature, the first flow rate, the second flow rate, and the third flow rate.

[0039] Optionally, the first temperature sensor 129 is installed at the water inlet of the primary pipeline 121. The first temperature sensor 129 is connected to the controller via a CAN bus to ensure real-time data transmission.

[0040] Optionally, the controller can pre-store matching information between the first temperature and the flow rate. For example, when the first temperature is 25°C, the first flow rate of the primary pipeline 121 is maintained at aL / min, the second flow rate of the secondary pipeline 122 needs to be evenly distributed according to the number of battery packs 14 (e.g., if there are 10 battery packs 14, the second flow rate of each secondary pipeline is bL / min), and the third flow rate of a single tertiary pipeline 123 is maintained at cL / min. When the first temperature changes, the controller controls the first valve 124 to adjust the first opening degree and / or controls the second valve 125 to adjust the second opening degree according to the matching information.

[0041] Optionally, when the first flow rate is less than the first preset flow rate value, the controller controls the first valve 124 to increase the first opening degree and / or controls the second valve 125 to increase the second opening degree until the first flow rate is greater than or equal to the first preset flow rate value; when the second flow rate is less than the second preset flow rate value, the controller controls the first valve 124 to increase the first opening degree and / or controls the second valve 125 to increase the second opening degree until the second flow rate is greater than or equal to the second preset flow rate value; when the third flow rate is less than the third preset flow rate value, the controller controls the first valve 124 to increase the first opening degree and / or controls the second valve 125 to increase the second opening degree until the third flow rate is greater than or equal to the third preset flow rate value.

[0042] It is understandable that the controller can achieve dynamic linkage adjustment of temperature and coolant flow of pipeline component 12 without manual intervention. When dealing with scenarios such as battery pack 14 charging and discharging and changes in ambient temperature, the response time is shortened, temperature overshoot caused by manual adjustment lag is avoided, and the operation stability and adjustment efficiency of heat exchange device 11 are greatly improved.

[0043] In one implementation method, please refer to Figure 1 , Figure 2 and Figure 3 The piping assembly 12 also includes a first pressure sensor 130, which is connected to the water inlet of the first-stage piping 121 and electrically connected to the controller. The first pressure sensor 130 is used to detect the first pressure of the coolant in the first-stage piping 121. When the first pressure sensor 130 detects that the first pressure is greater than the first preset pressure value, the controller controls the first valve 124 to increase the first opening degree and / or controls the second valve 125 to increase the second opening degree until the first pressure is less than or equal to the first preset pressure value.

[0044] It is understandable that by real-time detection of the first pressure and automatic overpressure adjustment, pipe bursts caused by excessive pressure in the pipeline assembly 12 can be avoided, reducing the pipeline failure rate. At the same time, the liquid cooling unit 15 can be protected from long-term overpressure operation and damage. Increasing the valve opening can both relieve pressure and increase flow rate, quickly adjusting the excessive first pressure and avoiding permanent pipeline damage caused by excessive first pressure. Moreover, through the coordinated adjustment between the first pressure and flow rate, the problem of increased first pressure and decreased flow rate caused by pipeline blockage can be improved, avoiding heat exchange interruption of the battery pack 14 due to excessive first pressure.

[0045] In one implementation method, please refer to Figure 1 , Figure 2 and Figure 3 The piping assembly 12 also includes a second temperature sensor 131, which is connected to the tertiary piping 123 and electrically connected to the controller. The second temperature sensor 131 is used to detect the second temperature of the coolant in the tertiary piping 123. When the second temperature sensor 131 detects that the second temperature is greater than the first preset temperature value, the controller controls the first valve 124 to increase the first opening degree and / or controls the second valve 125 to increase the second opening degree until the second temperature is less than or equal to the first preset temperature value.

[0046] It is understandable that by detecting the temperature of the three-stage pipeline 123, which reflects the heat dissipation effect of the battery pack 14, the actual operating temperature of each battery pack 14 is within a safe range, thus improving the accuracy of temperature detection of the battery pack 14. The controller can quickly adjust the flow rate of the three-stage pipeline 123 to prevent thermal runaway of the battery pack 14 and improve the accuracy and efficiency of adjusting the flow rate to change the temperature of the battery pack 14.

[0047] In one implementation method, please refer to Figure 1 and Figure 2 The primary pipeline 121 includes a first section and a second section, and the secondary pipeline 122 includes a third section and a fourth section. One end of the first section is connected to the liquid chiller unit 15, the other end of the first section is connected to one end of the third section, the other end of the third section is connected to one end of the tertiary pipeline 123, the other end of the tertiary pipeline 123 is connected to one end of the fourth section, the other end of the fourth section is connected to one end of the second section, and the other end of the second section is connected to the liquid chiller unit 15.

[0048] It is understandable that when a fault occurs in one of the first, second, third, or fourth segments, repairs can be carried out by isolating the segments without shutting down the entire system, thus avoiding the interruption of heat exchange for the entire battery cluster due to a single segment failure.

[0049] In one implementation method, please refer to Figure 1The first valve 124 is located in the fourth section; and / or the first flow meter 126 is located in the first section; and / or the second flow meter 127 is located in the third section.

[0050] It is understandable that the installation of the first valve 124 in the fourth stage improves control accuracy; the installation of the first flow meter 126 in the first stage avoids the influence of temperature changes on detection, thus improving detection accuracy; and the installation of the second flow meter 127 in the third stage avoids backwater mixing fluctuations, improving data stability. Because the first valve 124 is in the fourth stage, closing the valve during maintenance can cut off the secondary pipeline 122 without affecting the operation of the primary pipeline 121 and other secondary pipelines 122; the first flow meter 126 is in the first stage, so no other components need to be disassembled during commissioning; and the second flow meter 127 is in the third stage, allowing for quick comparison of the difference with the first flow meter 126 to determine if there is a leak in the secondary pipeline 122, improving troubleshooting efficiency and enhancing the accuracy of flow control.

[0051] In one implementation method, please refer to Figure 1 and Figure 2 The number of tertiary pipes 123 is multiple, and the multiple tertiary pipes 123 are spaced apart along the length direction of the battery cluster; or, the multiple tertiary pipes 123 are spaced apart along the width direction of the battery cluster.

[0052] It is understandable that by adapting the quantity and selecting the direction, it is ensured that each battery pack 14 can be covered by at least one tertiary pipeline 123, avoiding the overheating problem of the edge battery pack 14 caused by the traditional single pipeline covering multiple battery packs 14. Moreover, the spacing direction can be selected according to the actual layout of the battery cluster, and it can simultaneously adapt to the design scheme of multiple battery clusters. In addition, the parallel arrangement of multiple tertiary pipelines 123 can evenly distribute the total heat load of the battery cluster to each tertiary pipeline 123, reducing the load of a single tertiary pipeline 123.

[0053] Optional, please refer to Figure 1 and Figure 2 Multiple tertiary pipelines 123 are arranged at equal intervals along the length of the battery cluster; or, multiple tertiary pipelines 123 are arranged at equal intervals along the width of the battery cluster.

[0054] It is understandable that the equal spacing setting ensures that the distance between each battery pack 14 and the tertiary pipeline 123 is exactly the same, and the heat exchange conditions are the same. This avoids temperature fluctuations caused by differences in spacing. Non-equal spacing will lead to local thermal flow field disturbances. The equal spacing setting makes the coolant flow rate uniform throughout the entire battery cluster, the thermal flow field distribution stable, avoids the generation of local areas with excessively high temperatures, reduces the risk of battery thermal runaway, and reduces the difficulty of adjusting the flow rate.

[0055] In one implementation method, please refer to Figure 1The first valve 124 is a solenoid valve; and / or the second valve 125 is a butterfly valve; and / or the third flow meter 128 is an ultrasonic flow meter.

[0056] It is understandable that solenoid valves have a fast response time and can quickly respond to flow fluctuations; butterfly valves have a wide adjustment range and can accurately match different heat load requirements. Moreover, butterfly valves are small in size, reducing the space occupied; ultrasonic flow meters do not require conductive coolant, can be adapted to a variety of coolants, and can meet the needs of different energy storage scenarios.

[0057] Please refer to Figure 1 and Figure 2 The present invention also provides an energy storage device 10, including a battery cluster and a heat exchange device 11 as described above. The heat exchange device 11 is connected to the battery cluster and is used to exchange heat with the battery cluster.

[0058] Optionally, during the operation of the energy storage device 10, the following tests are performed: Under initial charging and discharging conditions, without controlling the flow rate, the temperature rise and temperature difference of the battery pack 14 are tested. The initial test conditions are: first flow rate 5 L / min, temperature control mode, and first temperature 20°C. First, the cooling capacity requirement, cell temperature, and temperature difference are tested while ensuring the outlet water temperature of the liquid cooler unit 15. Using the 5 L / min condition as the baseline, the impact of different flow rates on the cell temperature and temperature difference of the battery pack 14 is tested at an outlet water temperature of 20°C for the liquid cooler unit 15, while simultaneously monitoring changes in cooling capacity. After testing the above basic conditions, additional tests can be performed based on the results. Optionally, after setting the initial first temperature, different first, second, and third flow rates are adjusted to statistically analyze the coolant temperature and battery pack 14 temperature, finding the most suitable coolant temperature and appropriate flow rate.

[0059] Optionally, there can be multiple battery clusters. When the flow rate of one battery cluster deviates from the average flow rate of all battery clusters by a preset deviation value, the flow rate of one battery cluster is adjusted.

[0060] Optionally, there are multiple secondary pipes 122. The coolant in the primary pipe 121 is evenly distributed to the multiple secondary pipes 122. The first flow rate is the first flow rate divided by the number of secondary pipes 122. Otherwise, the first valve 124 is used to control the first opening degree of the secondary pipes 122, so that the coolant in the primary pipe 121 is evenly distributed to the multiple secondary pipes 122.

[0061] In the description of the embodiments of this utility model, it should be noted that the orientation or positional relationship of the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and other indicators are based on the orientation or positional relationship of the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0062] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Those skilled in the art can understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present utility model are still within the scope of the present utility model.

Claims

1. A heat exchange device, characterized in that, The heat exchange device is applied to a battery cluster, the battery cluster comprising a plurality of battery packs arranged sequentially at intervals, and the heat exchange device comprising: Liquid cooling units; A piping assembly, connected to the liquid cooling unit, is used to deliver coolant to the battery pack. The piping assembly includes a primary pipeline, a secondary pipeline, a first valve, a first flow meter, and a second flow meter. The primary pipeline is connected to the liquid cooling unit and the secondary pipeline. The secondary pipeline is also connected to the battery pack and exchanges heat with the battery pack. The first valve is connected to the secondary pipeline. The first flow meter is connected to the inlet of the primary pipeline. The second flow meter is connected to the inlet of the secondary pipeline. The first valve is used to control the first opening degree of the secondary pipeline. The first flow meter is used to detect the first flow rate of the coolant in the primary pipeline. The second flow meter is used to detect the second flow rate of the coolant in the secondary pipeline.

2. The heat exchange device according to claim 1, characterized in that, The piping assembly also includes a tertiary piping system, a second valve, and a third flow meter. The tertiary piping system is connected to the secondary piping system and is also connected to the battery pack for heat exchange. The second valve is connected to the tertiary piping system, and the third flow meter is connected to the tertiary piping system. The second valve is used to control the second opening degree of the tertiary piping system, and the third flow meter is used to detect the third flow rate of the coolant in the tertiary piping system.

3. The heat exchange device according to claim 2, characterized in that, The piping assembly also includes a controller and a first temperature sensor. The first temperature sensor is connected to the water inlet of the primary piping. The controller is electrically connected to the liquid chiller, the first temperature sensor, the first flow meter, the second flow meter, the third flow meter, the first valve, and the second valve. The first temperature sensor is used to detect the first temperature of the coolant in the primary piping. The controller is used to control the first valve to adjust the first opening degree and / or control the second valve to adjust the second opening degree according to the first temperature, the first flow rate, the second flow rate, and the third flow rate.

4. The heat exchange device according to claim 3, characterized in that, The pipeline assembly also includes a first pressure sensor, which is connected to the water inlet of the primary pipeline and electrically connected to the controller. The first pressure sensor is used to detect the first pressure of the coolant in the primary pipeline. When the first pressure sensor detects that the first pressure is greater than a first preset pressure value, the controller controls the first valve to increase the first opening degree and / or controls the second valve to increase the second opening degree until the first pressure is less than or equal to the first preset pressure value.

5. The heat exchange device according to claim 3, characterized in that, The piping assembly also includes a second temperature sensor, which is connected to the tertiary piping and electrically connected to the controller. The second temperature sensor is used to detect the second temperature of the coolant in the tertiary piping. When the second temperature sensor detects that the second temperature is greater than a first preset temperature value, the controller controls the first valve to increase the first opening degree and / or controls the second valve to increase the second opening degree until the second temperature is less than or equal to the first preset temperature value.

6. The heat exchange device according to claim 2, characterized in that, The primary pipeline includes a first section and a second section, and the secondary pipeline includes a third section and a fourth section. One end of the first section is connected to the liquid chiller unit, the other end of the first section is connected to one end of the third section, the other end of the third section is connected to one end of the tertiary pipeline, the other end of the tertiary pipeline is connected to one end of the fourth section, the other end of the fourth section is connected to one end of the second section, and the other end of the second section is connected to the liquid chiller unit.

7. The heat exchange device according to claim 6, characterized in that, The first valve is located in the fourth section; and / or, the first flow meter is located in the first section; and / or, the second flow meter is located in the third section.

8. The heat exchange device according to claim 6, characterized in that, The number of the three-stage pipelines is multiple, and the multiple three-stage pipelines are spaced apart along the length direction of the battery cluster; or, the multiple three-stage pipelines are spaced apart along the width direction of the battery cluster.

9. The heat exchange device according to claim 2, characterized in that, The first valve is a solenoid valve; and / or, the second valve is a butterfly valve; and / or, the third flow meter is an ultrasonic flow meter.

10. An energy storage device, characterized in that, It includes a battery cluster and a heat exchange device as described in any one of claims 1 to 9, the heat exchange device being connected to the battery cluster and used for heat exchange of the battery cluster.

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