Battery testing device, battery cooling method and energy storage device

Abstract

The invention discloses a battery testing device, a battery cooling method and an energy storage device, and relates to the technical field of batteries. The battery testing device comprises a first water circulation system, a control module, a first switch module, a plurality of first temperature detection modules and a plurality of second water circulation systems, the control module is used for acquiring the current temperature of each to-be-tested battery, and controlling the first switch module to be turned on under the condition that the current temperature is greater than a first preset temperature, so as to circularly cool the to-be-tested batteries through the first water circulation system and the at least one second water circulation system; and when the current temperature is smaller than the first preset temperature, the first switch module is controlled to be closed, so that the second water circulation system works to circularly cool the to-be-tested battery. By controlling the first water circulation system and the at least one second water circulation system, rapid cooling of the to-be-tested battery is realized, the cooling efficiency is improved, resources are saved, and the cost is reduced.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a battery testing device, a battery cooling method, and an energy storage device. Background Art

[0002] New energy batteries (such as lithium-ion batteries and solid-state batteries, etc.) need to conduct a large number of performance tests during the R & D and production processes, such as charge and discharge tests, temperature cycle tests, etc. A large amount of heat is generated during these test processes, so an efficient cooling system is required to maintain the stable operating temperature of the battery during the test. Traditional battery test cooling methods usually use disposable water or simple cooling methods, however, the cooling efficiency of these methods is relatively low. Summary of the Invention

[0003] Object of the Invention: Embodiments of this application provide a battery testing device, a battery cooling method, and an energy storage device to improve the cooling efficiency during the battery testing process.

[0004] Technical Solution: A battery testing device described in an embodiment of this application includes: a first water circulation system, a control module, a first switch module, a plurality of first temperature detection modules, and a plurality of second water circulation systems; wherein, each of the second water circulation systems is used to be connected to a battery under test; each of the first temperature detection modules is used to be connected to the battery under test and detect the current temperature of the battery under test; wherein, each of the second water circulation systems is connected to the first water circulation system through the first switch module;

[0005] The control module is connected to the first water circulation system, the first switch module, each of the second water circulation systems, and each battery under test;

[0006] The control module is configured to obtain the current temperature of each battery under test, and when the current temperature is greater than a first preset temperature, control the first switch module to turn on, so as to circulate and cool the battery under test through the first water circulation system and at least one of the second water circulation systems; and when the current temperature is less than the first preset temperature, control the first switch module to turn off, so as to circulate and cool the battery under test through the second water circulation system.

[0007] In some embodiments, the battery testing device further includes: a plurality of second temperature detection modules and a second switch module; wherein, each of the second temperature detection modules is connected to one of the second water circulation systems and is used to detect the temperature of the corresponding second water circulation system; each battery under test is connected to its adjacent second water circulation system through a second switch module;

[0008] The control module is further configured to: when the temperature of any one of two adjacent batteries to be tested is greater than a second preset temperature and the temperature of the other battery to be tested is less than a third preset temperature, control the second switch module corresponding to the battery to be tested with a temperature greater than the second preset temperature to be turned on, so as to circulate and cool the battery to be tested with a temperature greater than the second preset temperature through the second water circulation system corresponding to the battery to be tested with a temperature less than the third preset temperature.

[0009] In some embodiments, the second water circulation system includes: a cooling module and a cooling water circulation module;

[0010] Wherein, the cooling module is respectively connected to the battery to be tested and the cooling water circulation module, and the cooling module is configured to cool the heat generated by the battery to be tested and transport the cooled cooling water to the battery to be tested through the cooling water circulation module.

[0011] In some embodiments, the second water circulation system further includes: a water treatment module; the water treatment module is respectively connected to the cooling module, the cooling water circulation module and the first water circulation system, and is configured to purify the cooling water generated by the cooling of the cooling module and then transport it to the cooling water circulation module and the first water circulation system.

[0012] In some embodiments, the water treatment module includes a filtering unit, an ion exchange unit and a sterilization unit; wherein, the filtering unit is configured to filter the cooling water generated by the cooling of the cooling module; the ion exchange unit is configured to adjust the conductivity of the filtered cooling water.

[0013] In some embodiments, the first water circulation system and the second water circulation system have the same structure.

[0014] Correspondingly, an embodiment of the present application further provides an energy storage device, and the energy storage device includes the battery testing device described above.

[0015] Correspondingly, an embodiment of the present application further provides a method for cooling a battery, which is applied to a battery testing device; the battery testing device includes: a first water circulation system, a first switch module, a plurality of first temperature detection modules and a plurality of second water circulation systems; wherein, each of the second water circulation systems is configured to be connected to a battery to be tested; each of the first temperature detection modules is configured to be connected to a battery to be tested and is configured to detect the current temperature of the battery to be tested; wherein, each of the second water circulation systems is connected to the first water circulation system through the first switch module;

[0016] The method includes:

[0017] Obtain the current temperature of each battery to be tested;

[0018] When the current temperature is greater than the first preset temperature, control the first switch module to turn on, so as to control the first water circulation system and at least one of the second water circulation systems to circulate and cool the battery under test;

[0019] When the current temperature is less than the first preset temperature, control the first switch module to turn off, so as to circulate and cool the battery under test through the second water circulation system.

[0020] In some embodiments, the battery testing device further includes: a plurality of second temperature detection modules and a second switch module; wherein, each of the second temperature detection modules is connected to a corresponding second water circulation system for detecting the temperature of the corresponding second water circulation system; each battery under test is connected to the adjacent second water circulation system through a second switch module;

[0021] The method further includes: when the temperature of any one of two adjacent batteries under test is greater than the second preset temperature and the temperature of the other battery under test is less than the third preset temperature, control the second switch module corresponding to the battery under test with a temperature greater than the second preset temperature to turn on, so as to circulate and cool the battery under test with a temperature greater than the second preset temperature through the second water circulation system corresponding to the battery under test with a temperature less than the third preset temperature.

[0022] In some embodiments, the second preset temperature is greater than the third preset temperature.

[0023] Advantageous effects: Compared with the prior art, the battery testing device, the battery cooling method and the energy storage device of the embodiments of the present application. The battery testing device includes: a first water circulation system, a control module, a first switch module, a plurality of first temperature detection modules and a plurality of second water circulation systems; wherein, each second water circulation system is used to be connected to a battery under test; each first temperature detection module is used to be connected to the battery under test and detect the current temperature of the battery under test; wherein, each of the second water circulation systems is connected to the first water circulation system through the first switch module; the control module is connected to the first water circulation system, the first switch module, each of the second water circulation systems and each battery under test; the control module is used to obtain the current temperature of each battery under test, and when the current temperature is greater than the first preset temperature, control the first switch module to turn on, so as to circulate and cool the battery under test through the first water circulation system and at least one second water circulation system; and when the current temperature is less than the first preset temperature, control the first switch module to turn off, so as to circulate and cool the battery under test through the operation of the second water circulation system. The battery testing device provided by the present application can quickly cool the battery under test by controlling the first water circulation system and at least one second water circulation system when the temperature of the battery under test is too high and needs to be quickly cooled, and when the temperature of the battery under test is relatively high but does not require rapid cooling, cool the battery under test by controlling the second water circulation system, thereby improving the cooling efficiency while saving resources and reducing costs. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0025] Figure 1 It is a functional block diagram of an IM indirect vector control algorithm provided by an embodiment of the present application;

[0026] Figure 2 It is a schematic structural diagram of a second water circulation system provided by an embodiment of the present application;

[0027] Figure 3 It is a schematic overall structure diagram of a battery testing device provided by an embodiment of the present application;

[0028] Figure 4 It is a schematic principle structure diagram of a battery testing device provided by an embodiment of the present application;

[0029] Figure 5 It is a schematic principle structure block diagram of another battery testing device provided by an embodiment of the present application;

[0030] Figure 6 It is a flowchart of a battery cooling method provided in an embodiment of the present application.

[0031] Reference numerals:

[0032] 10 - First water circulation system; 20 - Control module; 31 - First switch module A; 32 - First switch module B; 33 - First switch module M; 41 - Second water circulation system A; 42 - Second water circulation system B; 43 - Second water circulation system M; 51 - First temperature detection module A; 52 - First temperature detection module B; 53 - First temperature detection module M; 101 - Battery under test A; 102 - Battery under test B; 103 - Battery under test M; 61 - Second switch module A; 62 - Second switch module M; 71 - Second temperature detection module A; 72 - Second temperature detection module B; 73 - Second temperature detection module M; 410 - Cooling module; 420 - Cooling water circulation module; 430 - Water treatment module; 431 - Filtration unit; 432 - Ion exchange unit; 433 - Sterilization unit. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0034] It should be understood that although terms such as first and second may be used herein to describe various components, these components should not be limited by these terms. These terms are used to distinguish one component from another. Therefore, the first component described below may be referred to as the second component without departing from the teachings of the concept of the present application. As used herein, the term "and / or" includes any one and all combinations of one or more of the associated listed items.

[0035] Those skilled in the art can understand that the drawings are only schematic diagrams of exemplary embodiments and may not be to scale. The modules or processes in the drawings are not necessarily essential for implementing the present application and thus cannot be used to limit the protection scope of the present application.

[0036] Figure 1 It is a principle structural block diagram of a battery test device provided in an embodiment of the present application. Please refer to Figure 1, the battery testing device includes: a first water circulation system 10, a control module 20, a first switch module, a plurality of first temperature detection modules, and a plurality of second water circulation systems; wherein, each second water circulation system is used to connect to a battery under test; each first temperature detection module is used to connect to the battery under test and detect the current temperature of the battery under test; wherein, each of the second water circulation systems is connected to the first water circulation system through the first switch module; the control module 20 is connected to the first water circulation system, the first switch module, each of the second water circulation systems, and each of the batteries under test; the control module 20 is configured to obtain the current temperature of each battery under test, and when the current temperature is greater than a first preset temperature, control the first switch module to turn on, so as to circulate and cool the battery under test through the first water circulation system and at least one second water circulation system; when the current temperature is less than the first preset temperature, control the first switch module to turn off, so as to circulate and cool the battery under test through the second water circulation system.

[0037] Wherein, the battery testing device includes a plurality of first temperature detection modules and a plurality of second water circulation systems. Exemplarily, please refer to Figure 1 , the plurality of first temperature detection modules include a first temperature detection module A 51, a first temperature detection module B 52,..., a first temperature detection module M 53, and the plurality of second water circulation systems include a second water circulation system A 41, a second water circulation system B 42,..., a second water circulation system M 43.

[0038] Wherein, each second water circulation system is used to connect to a battery under test; each first temperature detection module is used to connect to a battery under test and detect the current temperature of the battery under test. Exemplarily, please refer to Figure 1 , the second water circulation system A 41 is connected to the battery under test A 101 and is used to circulate and cool the battery under test A 101. The second water circulation system B 42 is connected to the battery under test B 102 and is used to circulate and cool the battery under test B 102. The second water circulation system M 43 is connected to the battery under test M 103 and is used to circulate and cool the battery under test M 103. The first temperature detection module A 51 is connected to the battery under test A 101 and is used to detect the current temperature of the battery under test A 101. The first temperature detection module B 52 is connected to the battery under test B 102 and is used to detect the current temperature of the battery under test B 102. The first temperature detection module M 53 is connected to the battery under test M 103 and is used to detect the current temperature of the battery under test M 103.

[0039] Wherein, each of the second water circulation systems is connected to the first water circulation system through the first switch module. Exemplarily, please refer to Figure 1, the second water circulation system A 41 is connected to the first water circulation system 10 through the first switch module A 31, the second water circulation system B 42 is connected to the first water circulation system 10 through the first switch module B 32, and the second water circulation system M 43 is connected to the first water circulation system 10 through the first switch module M 33.

[0040] Among them, the control module 20 is connected to the first water circulation system 10, the first switch module, each first temperature detection module, each second water circulation system, and each battery under test. Exemplarily, please refer to Figure 1 , the control module 20 is connected to the first water circulation system 10, and is used to control the opening or closing of the first water circulation system 10, etc. The control module 20 is connected to the first switch module A 31, the first switch module B 32, and the first switch module M 33, and is used to control the opening or closing of the first switch module A 31, the first switch module B 32, and the first switch module M 33. The control module 20 is connected to the first temperature detection module A 51, the first temperature detection module B 52, and the first temperature detection module M 53, and is used to obtain the current temperature of the battery under test A 101, the current temperature of the battery under test B 102, and the current temperature of the battery under test M 103 respectively.

[0041] Among them, the control module 20 is connected to the second water circulation system A 41, the second water circulation system B 42, and the second water circulation system M 43, and is used to control the individual opening or closing of the second water circulation system A 41, the individual opening or closing of the second water circulation system B 42, and the individual opening or closing of the second water circulation system M 43. Among them, the control module 20 is connected to the battery under test A 101, the battery under test B 102, and the battery under test M 103, and is used to obtain information such as the current, voltage, and power of each battery under test. Specifically, it can be set according to the actual situation and will not be specifically limited here.

[0042] Among them, the control module 20 can be integrally arranged in the first water circulation system 10. The first water circulation system 10 can control each second water circulation system. Each second water circulation system can request the first water circulation system 10 through communication, but cannot control the first water circulation system 10. The first water circulation system 10 can control the opening or closing of the first switch module of each second water circulation system through the control module 20. The first water circulation system 10 can synchronously monitor each second water circulation system through the control module 20 and can operate each second water circulation system individually. Each second water circulation system is an individual that can operate independently and can be operated individually when joint debugging is not required.

[0043] Among them, the first switch module is a valve switch, and the specific model can be set according to the actual situation and will not be specifically limited here.

[0044] It should be noted that the battery under test in the embodiments of the present application can be one or more of a battery cell, a battery pack, and a battery module, and can be specifically set according to actual situations, and no specific limitation is made here.

[0045] Among them, the control module 20 can be a control chip such as a single-chip microcomputer, and can be specifically set according to actual situations, and no specific limitation is made here.

[0046] Among them, the first temperature detection module can be a temperature sensor, etc., and specific settings such as the model can be set according to actual situations, and no specific limitation is made here.

[0047] Among them, pipelines are connected between the first water circulation system 10 and each first switch module, and pipelines are connected between each first switch module and the applied second water circulation system. Each battery under test is connected to the corresponding second water circulation system through a pipeline. Each battery under test can also be individually connected to the first water circulation system through a pipeline, and can be specifically set according to actual situations, and no specific limitation is made here.

[0048] Among them, the first preset temperature is a relatively high temperature. When the current temperature of the battery under test is greater than the first preset temperature, the corresponding battery under test needs to be quickly cooled down to ensure the stable and reliable test process. When the current temperature of the battery under test is less than the first preset temperature, the cooling speed requirement for the corresponding battery under test is not so high, and normal cooling can be carried out. Exemplarily, the value range of the first preset temperature is: a temperature greater than 200 degrees Celsius, and can be specifically set according to actual situations, and no specific limitation is made here.

[0049] In the technical solution of the embodiments of the present application, the implementation process of the battery test device is: Exemplarily, please refer to Figure 1, the control module 20 is connected to the first water circulation system 10, the first switch module, each first temperature detection module, each second water circulation system, and each battery under test. Assume that the current temperature of the battery under test B 102 is greater than the first preset temperature, indicating that the battery under test B 102 needs to be rapidly cooled at this time. At this time, the control module 20 controls the opening of the first switch module B 32. After the first switch module B 32 is opened, the pipeline between the first water circulation system 10 and the second water circulation system B 42 is connected, so as to circulate and cool the battery under test B 102 by jointly controlling the first water circulation system 10 and the second water circulation system B 42 (that is, perform primary cooling through the second water circulation system B 42, and then perform secondary cooling through the first water circulation system 10), realizing rapid cooling, so as to ensure the stable and reliable test process of the battery under test B 102. When the current temperature of the battery under test B 102 is less than the first preset temperature and meets the temperature at which cooling is required (the temperature at which cooling is required can be set according to actual conditions and is not specifically limited here), control the first switch module B 32 to close, so as to circulate and cool the battery under test B 102 through the second water circulation module B 42, thereby saving resources and reducing costs while ensuring that the battery under test B 102 meets the temperature required for its test process. Moreover, compared with the related art, it can achieve rapid cooling during the battery test process while also realizing circulating cooling, thereby saving resources and reducing costs.

[0050] Figure 2 It is a schematic structural diagram of a second water circulation system provided in an embodiment of the present application. In some embodiments, please refer to Figure 2 , the second water circulation system includes: a cooling module 410 and a cooling water circulation module 420; wherein, the cooling module 410 is respectively connected to the battery under test (exemplarily, taking the battery pack 100 as an example) and the cooling water circulation module 420, and the cooling module 410 is used to cool the heat generated by the battery under test and transport the cooling water generated by the cooling to the battery under test through the cooling water circulation module 420.

[0051] Exemplarily, in the technical solution of the embodiment of the present application, taking the battery under test as Figure 2 the battery pack 100 shown as an example for description. Among them, the battery pack 100 is connected to the cooling module 410 through an outlet pipe, the cooling module 410 is connected to the cooling water circulation module 420, and the cooling water circulation module 420 is connected to the battery pack 100 through an inlet pipe.

[0052] Among them, the cooling module 410 is used to cool the battery pack 100 during the test, and the cooling water circulation module 420 is used to re-transport the cooled or processed (for example, purified treatment, etc.) cooling water to the cooling module 410.

[0053] Among them, the cooling module 410 includes a cooling plate 411, a heat exchanger 412, and cooling pipes. Among them, the cooling plate 411 is in direct contact with the battery pack 100 to absorb the heat generated by the battery pack 100. The cooling pipes transfer the heat to the heat exchanger 412. Among them, the heat exchanger 412 can be a radiator or the like, and can be specifically set according to the actual situation, and no specific limitation is made here.

[0054] Among them, the cooling water circulation module 420 includes a water pump 421, a water tank 422, and pipes. Among them, the water pump 421 is used to provide power, the water tank 422 is used to store cooling water, and the pipes are used to connect each module.

[0055] In some embodiments, please continue to refer to Figure 2 , the second water circulation system further includes: a water treatment module 430; the water treatment module 430 is respectively connected to the cooling module 410, the cooling water circulation module 420, and the first water circulation system 10, and is used to purify the cooling water generated by cooling the cooling module 410 and then transport it to the cooling water circulation module 420 and the first water circulation system 10.

[0056] Among them, the water treatment module 430 is connected to the cooling module 410 and is used to purify the cooling water generated by cooling the cooling module 410. The water treatment module 430 is respectively connected to the cooling water circulation module 420 and the first water circulation system 10. On the one hand, part of the purified cooling water is transported to the cooling water circulation module 420 to re-transport the cooling water into the cooling pipes of the battery pack, and then transported into the cooling module 410 to form a circulating cooling loop. On the other hand, part of the purified cooling water is transported to the first water circulation system 10 to be cooled again through the first water circulation system 10, so as to accelerate the cooling speed and efficiency.

[0057] In some embodiments, please continue to refer to Figure 2 , the water treatment module 430 includes a filtering unit 431, an ion exchange unit 432, and a sterilization unit 433; among them, the filtering unit 431 is used to filter the cooling water generated by cooling the cooling module 410; the ion exchange unit 432 is used to adjust the conductivity of the filtered cooling water.

[0058] Among them, the filtering unit 431 can be a filtering device such as a filter or a filter net, etc., and can be specifically set according to the actual situation, and no specific limitation is made here.

[0059] Among them, the ion exchange unit 432 can be an ion exchange device or the like, and can be specifically set according to the actual situation, and no specific limitation is made here.

[0060] Among them, the sterilization unit 433 can be a sterilization device or the like, and can be specifically set according to the actual situation, and no specific limitation is made here.

[0061] Continuing to refer to Figure 2 , the second water circulation system further includes a temperature control module 440, which is respectively connected to the water tank 422 and the battery pack 100, and is used to precisely control the temperature of the cooling water in the pipeline. Among them, the temperature control module 440 includes a heater 441 and a temperature sensor. Among them, the heater 441 is used to adjust the temperature of the cooling water in the pipeline according to the set temperature. Exemplarily, the temperature of the cooling water in the pipeline can be adjusted and controlled in cooperation with the heater 441 and the cooling module 410. Specifically, it is set according to parameters such as the set temperature required in actual situations, and no specific limitations are made here.

[0062] In addition, continuing to refer to Figure 2 , the second water circulation system further includes a plurality of temperature sensors T0. For example, temperature sensors T0 are provided in the cooling module 410, the cooling water circulation module 420, and the water treatment module 430. The specific installation positions and quantities can be set according to actual situations, and no specific limitations are made here.

[0063] In some embodiments, the structures of the first water circulation system 10 and the second water circulation system are the same.

[0064] Among them, the principle of the first water circulation system 10 performing cooling treatment alone is similar to that of the second water circulation system performing cooling treatment alone. When the first water circulation system 10 and the second water circulation system perform combined cooling treatment, the second water circulation system performs primary cooling, and the first water circulation system performs secondary cooling. Through two-stage cooling treatment, rapid cooling of the battery under test can be achieved, thereby improving the cooling efficiency.

[0065] In the technical solution of the embodiment of the present application, the implementation process of the second water circulation system for cooling the battery pack is as follows: Exemplarily, the battery pack 100 is connected to the cooling module 410 through an outlet pipe (or outlet pipeline). The cooling module 410 is respectively connected to the cooling water circulation module 420 and the water treatment module 430. The cooling water circulation module 420 is connected to the battery pack through an inlet pipe (or inlet and outlet pipeline) to form a circulating cooling loop. The heat of the battery pack 100 enters the cooling module 410 through the outlet pipe. After the heat is cooled and exchanged in the cooling module 410, the output cooling water is purified by the water treatment module 430. A part of it flows back to the battery pack 100 through the cooling water circulation module 420 and the inlet pipe to cool the battery pack. After that, the cooling water is returned to the cooling module 410 for cooling, thereby forming a circulating cooling loop. Another part of the cooling water purified by the water treatment module 430 is transported to the first water circulation system 10. Thus, circulating cooling and temperature reduction of the battery pack 100 can be achieved, thereby ensuring the stability and reliability of the battery pack 100 during the test process. Moreover, the recycling of cooling water can save resources and reduce costs.

[0066] Figure 3 It is a schematic diagram of the overall structure of a battery testing device provided in an embodiment of the present application. Exemplarily, please refer to Figure 3 , the first water circulation system is the main water circulation system, and the second water circulation system is the sub-water circulation system. Exemplarily, refer to Figure 3 , the battery testing device includes a main water circulation system, sub-water circulation system 1#, sub-water circulation system 2#, sub-water circulation system 3#, sub-water circulation system 4#,..., sub-water circulation system P#, etc. The specific number of sub-water circulation systems included can be set according to actual situations and will not be specifically limited here.

[0067] Figure 4 It is a schematic diagram of the principle structure of a battery testing device provided in an embodiment of the present application. Exemplarily, taking a battery pack as an example, refer to Figure 4 , battery pack 1# is connected to sub-water circulation system 1#, battery pack 2# is connected to sub-water circulation system 2#,..., battery pack 7# is connected to sub-water circulation system 7#. The battery testing device further includes a sub-docking system, a main water circulation system, and a communication interaction system. Among them, the sub-docking system includes a connection switch system (i.e., the first switch module), and sub-water circulation system 1#, sub-water circulation system 2#,..., sub-water circulation system 7# are connected to the main water circulation system through the connection switch system. Among them, the communication interaction system includes a human-machine interface, an alarm module, a communication interaction system, a data acquisition system, a temperature control module, an intelligent processing module, etc. The communication interaction system is connected to communication 1#, communication 2#,..., communication 7#.

[0068] Among them, each sub-water circulation system can communicate with the main water circulation system through communication. For example, sub-water circulation system 1# communicates with the main water circulation system through communication 1#, sub-water circulation system 2# communicates with the main water circulation system through communication 2#,..., sub-water circulation system 7# communicates with the main water circulation system through communication 7#. Among them, the control module 20 is connected to each sub-water circulation system through communication to monitor and adjust the temperature of the battery pack 100 in real time, so as to quickly adjust the temperature of the battery pack 100 to the target value, and at the same time optimize the energy usage efficiency. And based on the specific heat capacity and transmission efficiency of the water in each sub-water circulation system, multiple calculations are carried out, automatically calculated, temperature compensation is performed for each cycle, and the optimal temperature adjustment plan is calculated to perform energy adjustment according to the optimal plan, so that the temperature of the battery pack quickly reaches the target required value. The specific working process is as follows: First, data acquisition is performed, and the control module 20 obtains real-time data from each sub-water circulation system. Among them, the real-time data includes but is not limited to the specific heat capacity of water, the transmission efficiency, and the current temperature. Then, multiple calculations and temperature compensation are performed. The control module 20 performs multiple iterative calculations based on the collected real-time data and comprehensively considers the following factors.

[0069] First, clarify the input data required for the calculation. The input data includes: physical quantities (such as temperature, pressure, and flow rate, etc.), system parameters (such as specific heat capacity and transmission efficiency, etc.), temperature change calculation formula, energy balance calculation formula, material influence factors (such as the influence of the specific heat capacity of water on heat absorption and release), conduction influence factors (such as the loss of transmission efficiency of water during the circulation process), and environmental influence factors (such as the difference between the current environmental temperature and the target temperature).

[0070] Among them, the temperature change calculation formula is:

[0071] ΔT = Q / (m × c);

[0072] Among them, ΔT is the temperature difference, that is, the temperature change amount of the cooling water; m is the heat of the cooling water, m is the mass of the cooling water, and c is the specific heat capacity of the cooling water.

[0073] Among them, the energy balance calculation formula is:

[0074] E in -E out = ΔE;

[0075] Among them, ΔE is the difference between the energy E of the current temperature of the cooling water in and the energy E of the target temperature of the cooling water out . For example, assuming the current temperature is 40°C and the target temperature is 20°C, if the target temperature is to be reached, the corresponding energy difference is (40°C - 20°C) * the specific heat capacity of the material used. Among them, the specific heat capacity of water and the specific heat capacity of the material are different (because there are differences due to heat conduction), so the temperature can be adjusted.

[0076] Second, automatically calculate the optimal solution. The control module 20 generates the optimal solution for temperature adjustment according to the above calculation results. This solution aims to minimize energy consumption while ensuring that the battery pack temperature quickly reaches the target value. Specifically, it includes: First, initial value setting. The initial temperature setting value will be adjusted according to dynamic changes. Then, update the parameters in each cycle, and adjust the temperature setting value after multiple calculations. Among them, the sampling period is set to 10S. Second, the optimal temperature adjustment solution, that is, the device calculates the energy that needs to be generated under different strategies inside, and makes a comparison, adjusts the energy distribution strategy, and achieves the purpose of energy conservation and efficiency improvement. Finally, determine whether the convergence condition is met. The convergence condition is: when the parameter setting value issues a need for adjustment continuously for more than 3 times, the temperature will be reset.

[0077] Secondly, according to the optimal solution, the control module 20 dynamically adjusts the energy distribution, such as adjusting the rotation speed of the water pump or the power of the heating device, or the power of the cooling device, to ensure that the energy consumption of the entire system is in the efficient range and avoid waste of resources.

[0078] Finally, the control module continuously monitors the temperature change of the battery pack and dynamically adjusts the solution according to the actual effect. Specifically, through a temperature closed-loop control system (such as a temperature proportional-integral-derivative closed-loop control system), the temperature regulation strategy can be continuously optimized to improve the overall performance.

[0079] It should be noted that the technical solution of the embodiment of the present application is applicable to the thermal management system of an electric vehicle battery pack, which can significantly improve the working efficiency and lifespan of the battery.

[0080] Among them, a plurality of valve switches (i.e., the second switch module) are arranged in the main water circulation system, which can directly and quickly convert the temperature between different batteries to be tested (or battery packs) without heating and direct cooling environments, so as to achieve the purpose of rapid temperature regulation.

[0081] Figure 5 It is the principle structural block diagram of another battery testing device provided in the embodiment of the present application. Please refer to Figure 5 This battery testing device further includes: a plurality of second temperature detection modules and a second switch module; among them, each second temperature detection module is connected to a second water circulation system for detecting the temperature of the corresponding second water circulation system; each battery to be tested is connected to its adjacent second water circulation system through a second switch module; the control module 20 is further configured to: when the temperature of any one of two adjacent batteries to be tested is greater than a second preset temperature and the temperature of the other battery to be tested is less than a third preset temperature, control the opening of the second switch module corresponding to the battery to be tested with a temperature greater than the second preset temperature, so as to circulate and cool the battery to be tested with a temperature greater than the second preset temperature through the second water circulation system corresponding to the battery to be tested with a temperature less than the third preset temperature.

[0082] Among them, the second switch module is a valve switch, which can be specifically set according to the actual situation and is not specifically limited here.

[0083] Among them, each second temperature detection module is connected to a second water circulation system for detecting the temperature of the corresponding second water circulation system; each battery to be tested is connected to its adjacent second water circulation system through a second switch module. Exemplarily, please refer to Figure 5, the battery testing device includes a second temperature detection module A 71, a second temperature detection module B 72, …, a second temperature detection module M 73. Among them, the second temperature detection module A 71 is connected to the second water circulation system A 41 for detecting the temperature of the second water circulation system A 41. The second temperature detection module B 72 is connected to the second water circulation system B 42 for detecting the temperature of the second water circulation system B 42. The second temperature detection module M 73 is connected to the second water circulation system M 43 for detecting the temperature of the second water circulation system M 43. Among them, M and N are natural numbers.

[0084] Exemplarily, continue to refer to Figure 5 , the battery testing device includes a second switch module A 61 and a second switch module N 62, etc. Among them, the second switch module A 61 is respectively connected to the battery under test A 101 and the battery under test B 102, and the second switch module N 62 is respectively connected to the battery under test B 102 and the battery under test M 103. Among them, the battery under test B 102 is adjacent to the battery under test A 101 and the battery under test M 103 respectively.

[0085] In the technical solution of the embodiment of the present application, the implementation process of the battery testing device is as follows: Exemplarily, please refer to Figure 5 , assume that there are two adjacent batteries under test A 101 and battery under test B 102. Among them, the temperature of the battery under test A 101 is greater than the second preset temperature, and the temperature of the battery under test B 102 is less than the third preset temperature. The control module 20 controls the second switch module A 61 corresponding to the battery under test A 101 to be turned on, so as to circulate and cool the battery under test A 101 through the second water circulation system B 42 corresponding to the battery under test B 102. Assume that there are two adjacent batteries under test B 102 and battery under test M 103. Among them, the temperature of the battery under test B 102 is greater than the second preset temperature, and the temperature of the battery under test M 103 is less than the third preset temperature. The control module 20 controls the second switch module N 62 to be turned on, so as to circulate and cool the battery under test B 102 through the second water circulation system M 43 corresponding to the battery under test M 103. The temperature between different batteries under test (or battery packs) can be directly and quickly converted without heating and direct cooling environments, so as to achieve the purpose of rapid temperature adjustment.

[0086] In addition, when the current temperature of the battery under test is greater than the first preset temperature, the control module not only controls the first switch module corresponding to the battery under test to turn on, but also can turn on the second switch module corresponding to the battery under test adjacent to the battery under test, so as to circulate and cool the battery under test through the first water circulation system 10, the second water circulation system corresponding to the battery under test, and the second water circulation system corresponding to the battery under test adjacent to the battery under test. For example, assume that the current temperature of the battery under test B 102 is greater than the first preset temperature, indicating that the battery under test B 102 needs to be quickly cooled down at this time. At this time, the control module 20 controls the first switch module B 32 to turn on and controls the second switch module A 61 to turn on. After the first switch module B 32 is turned on, the pipeline between the first water circulation system 10 and the second water circulation system B 42 is connected. After the second switch module A 61 is turned on, the pipeline between the second water circulation system B 42 and the second water circulation system A 41 is connected. Thus, by controlling the first water circulation system 10, the second water circulation system B 42, and the second water circulation system A 41, the battery under test B 102 is circulated and cooled down to achieve rapid cooling, thereby ensuring the stable and reliable test process of the battery under test B 102.

[0087] Correspondingly, the embodiment of the present application further provides an energy storage device, and the energy storage device includes the battery test device described in any embodiment of the present application.

[0088] Among them, the energy storage device can be a new energy battery, a battery pack, a battery module, etc., and can be specifically set according to actual situations, and no specific limitation is made here.

[0089] Figure 6 is a flowchart of a battery cooling method provided in the embodiment of the present application. Correspondingly, the embodiment of the present application further provides a battery cooling method, and the method is applied to a battery test device. The battery test device includes: a first water circulation system, a first switch module, a plurality of first temperature detection modules, and a plurality of second water circulation systems; wherein, each second water circulation system is used to be connected to a battery under test; each first temperature detection module is used to be connected to a battery under test for detecting the current temperature of the battery under test; wherein, each of the second water circulation systems is connected to the first water circulation system through the first switch module.

[0090] Please refer to Figure 6 , the battery cooling method includes the following steps:

[0091] Step 110, obtain the current temperature of each battery under test.

[0092] Step 120, when the current temperature is greater than the first preset temperature, control the first switch module to turn on, so as to control the first water circulation system and at least one second water circulation system to circulate and cool the battery under test.

[0093] Step 130: When the current temperature is lower than the first preset temperature, control the first switch module to turn off, so as to circulate and cool the battery under test through the second water circulation system.

[0094] In the technical solution of the embodiment of the present application, by providing a battery cooling method, the battery cooling method includes: obtaining the current temperature of each battery under test; when the current temperature is higher than the first preset temperature, controlling the first switch module to turn on, so as to control the first water circulation system and at least one second water circulation system to circulate and cool the battery under test; when the current temperature is lower than the first preset temperature, controlling the first switch module to turn off, so as to circulate and cool the battery under test through the second water circulation system. The battery cooling method provided by the present application can quickly cool the battery under test by controlling the first water circulation system and at least one second water circulation system when the temperature of the battery under test is too high and needs to be quickly cooled, and can cool the battery under test by controlling the second water circulation system when the temperature of the battery under test is relatively high but does not require quick cooling. Therefore, while improving the cooling efficiency, resources can be saved and costs can be reduced.

[0095] In some embodiments, the battery testing device further includes: a plurality of second temperature detection modules and a second switch module; wherein, each second temperature detection module is connected to a second water circulation system, and is used to detect the temperature of the corresponding second water circulation system; each battery under test is connected to the adjacent second water circulation system through a second switch module; the method further includes: when the temperature of one battery under test among two adjacent batteries under test is higher than the second preset temperature and the temperature of the other battery under test is lower than the third preset temperature, controlling the second switch module corresponding to the battery under test with a temperature higher than the second preset temperature to turn on, so as to circulate and cool the battery under test with a temperature higher than the second preset temperature through the second water circulation system corresponding to the battery under test with a temperature lower than the third preset temperature.

[0096] In some embodiments, the second preset temperature is higher than the third preset temperature.

[0097] Wherein, the specific values of the second preset temperature and the third preset temperature can be set according to the actual situation, and no specific limitation is made here.

[0098] In the above embodiments, the descriptions of the respective embodiments have their own focuses. For parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0099] The above has introduced in detail the battery testing device, the battery cooling method, and the energy storage device provided by the embodiments of the present application, and specific examples have been used to illustrate the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present application; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery testing device, characterized in that, Comprising: A first water circulation system, a control module, a first switch module, a plurality of first temperature detection modules, and a plurality of second water circulation systems; wherein, each of the second water circulation systems is used to be connected to a battery under test; each of the first temperature detection modules is used to be connected to the battery under test and detect the current temperature of the battery under test; wherein, each of the second water circulation systems is connected to the first water circulation system through the first switch module; The control module is connected to the first water circulation system, the first switch module, each of the second water circulation systems, and each battery under test; The control module is used to obtain the current temperature of each battery under test, and when the current temperature is greater than a first preset temperature, control the first switch module to turn on, so as to circulate and cool the battery under test through the first water circulation system and at least one of the second water circulation systems; and when the current temperature is less than the first preset temperature, control the first switch module to turn off, so as to circulate and cool the battery under test through the second water circulation system.

2. The battery testing device according to claim 1, wherein, Further comprising: A plurality of second temperature detection modules and a second switch module; wherein, each of the second temperature detection modules is connected to one of the second water circulation systems, and is used to detect the temperature of the corresponding second water circulation system; each battery under test is connected to the adjacent second water circulation system through a second switch module; The control module is further used to: when the temperature of any one of two adjacent batteries under test is greater than a second preset temperature and the temperature of the other battery under test is less than a third preset temperature, control the second switch module corresponding to the battery under test with a temperature greater than the second preset temperature to turn on, so as to circulate and cool the battery under test with a temperature greater than the second preset temperature through the second water circulation system corresponding to the battery under test with a temperature less than the third preset temperature.

3. The battery testing device according to claim 1, wherein The second water circulation system includes: a cooling module and a cooling water circulation module; Wherein, the cooling module is respectively connected to the battery under test and the cooling water circulation module, and the cooling module is used to cool the heat generated by the battery under test, and convey the cooling water generated by the cooling to the battery under test through the cooling water circulation module.

4. The battery testing device according to claim 3, characterized in that The second water circulation system further includes: a water treatment module; the water treatment module is respectively connected to the cooling module, the cooling water circulation module, and the first water circulation system, and is used to purify the cooling water generated by the cooling of the cooling module and then convey it to the cooling water circulation module and the first water circulation system.

5. The battery testing device according to claim 4, wherein, The water treatment module includes a filtering unit, an ion exchange unit, and a sterilization unit; wherein, the filtering unit is used to filter the cooling water generated by the cooling of the cooling module; the ion exchange unit is used to adjust the conductivity of the filtered cooling water.

6. The battery testing device according to claim 1, wherein The structures of the first water circulation system and the second water circulation system are the same.

7. An energy storage device, characterized in that, Including the battery testing device according to any one of claims 1-6.

8. A cooling method for a battery, characterized in that, Applied to a battery testing device; the battery testing device includes: a first water circulation system, a first switch module, a plurality of first temperature detection modules, and a plurality of second water circulation systems; wherein, each of the second water circulation systems is used to be connected to a battery under test; each of the first temperature detection modules is used to be connected to a battery under test and detect the current temperature of the battery under test; wherein, each of the second water circulation systems is connected to the first water circulation system through the first switch module; The method includes: Obtaining the current temperature of each battery under test; When the current temperature is greater than a first preset temperature, controlling the first switch module to turn on, so as to control the first water circulation system and at least one of the second water circulation systems to cool the battery under test in a cycle; When the current temperature is less than the first preset temperature, controlling the first switch module to turn off, so as to cool the battery under test in a cycle through the second water circulation system.

9. The cooling method of the battery according to claim 8, wherein, The battery testing device further includes: a plurality of second temperature detection modules and a second switch module; wherein, each of the second temperature detection modules is connected to a second water circulation system and used to detect the temperature of the corresponding second water circulation system; each battery under test is connected to the adjacent second water circulation system through a second switch module; The method further includes: when the temperature of any one of two adjacent batteries under test is greater than a second preset temperature and the temperature of the other battery under test is less than a third preset temperature, controlling the second switch module corresponding to the battery under test with a temperature greater than the second preset temperature to turn on, so as to cool the battery under test with a temperature greater than the second preset temperature in a cycle through the second water circulation system corresponding to the battery under test with a temperature less than the third preset temperature.

10. The cooling method of the battery according to claim 9, characterized in that, The second preset temperature is greater than the third preset temperature.

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