Energy storage thermal management system

Abstract

The embodiments of the present disclosure disclose an energy storage thermal management system. A specific implementation of the system includes: a refrigerant circulation system, a battery cooling system, and an energy storage inverter cooling system; the refrigerant circulation system includes: a compressor, a condenser, an evaporator, a throttling assembly, and a first fan assembly; the battery cooling system includes: a first water pump, a water-to-water heat exchanger, a first three-way valve, a first heat exchanger, an ambient temperature sensor, a first water inlet temperature sensor, and a first water outlet temperature sensor; the energy storage inverter cooling system includes: a second water pump, a second fan assembly, a second heat exchanger, a second three-way valve, a second return water temperature sensor, and an energy storage inverter; when the second fan assembly is in operation, the flowing air first passes through the first heat exchanger and then through the second heat exchanger. This implementation can provide liquid cooling for both the energy storage battery cluster and the energy storage inverter simultaneously, maintaining the energy storage battery cluster and the energy storage inverter within a suitable operating temperature range.

Description

Technical Field

[0001] The present disclosure relates to the field of energy storage thermal management, and in particular to an energy storage thermal management system. Background Art

[0002] In recent years, electrochemical energy storage systems have developed towards high energy density, wide operating range, and small size. High energy density leads to increased heat generation in battery clusters, and traditional air cooling systems can no longer meet this demand. Compared with air cooling, liquid cooling systems have higher heat dissipation rates and efficiency. Liquid cooling has the characteristics of large heat load, low flow resistance, and high heat exchange efficiency. It is widely used in situations where battery energy density is high and charge and discharge rates are fast. Liquid cooling has been widely promoted and applied.

[0003] The main heat sources in energy storage products are battery clusters and power storage inverters (PCS). In current technologies, batteries are often cooled by liquid cooling, while power storage inverters (PCS) still use forced air cooling for heat dissipation. Two cooling systems will increase the size of the energy storage product and require a larger floor space during installation and use. Low-temperature coolant is usually used to cool the battery cluster, while the coolant required for cooling the power storage inverter is medium- and high-temperature coolant.

[0004] The above information disclosed in this Background section is only for enhancement of understanding of the background of the present disclosure concept and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art. Summary of the Invention

[0005] The content of this disclosure is used to briefly introduce concepts that will be described in detail in the detailed description section below. The content of this disclosure is not intended to identify key features or essential features of the claimed technical solution, nor is it intended to limit the scope of the claimed technical solution.

[0006] The present disclosure proposes an energy storage thermal management system to solve one or more of the technical problems mentioned in the above background technology section.

[0007] In a first aspect, the present disclosure provides an energy storage thermal management system, which includes: a refrigerant circulation system, a battery cooling system and an energy storage inverter cooling system, wherein the refrigerant circulation system includes: a compressor, a condenser, an evaporator, a throttling assembly and a first fan assembly; the battery cooling system includes: a first water pump, a water-to-water heat exchanger, a first three-way valve, a first heat exchanger, an ambient temperature sensor, a first water inlet temperature sensor, and a first water outlet temperature sensor; the energy storage inverter cooling system includes: a second water pump, a second fan assembly, a second heat exchanger, a second three-way valve, and a second return water temperature sensor; wherein the first three-way valve and the second three-way valve each have three interfaces; the first heat exchanger and the second heat exchanger are arranged side by side; when the second fan assembly is in operation, the flowing air first passes through the first heat exchanger and then passes through the second heat exchanger; the first heat exchanger and the second heat exchanger are arranged separately, and the first heat exchanger and the second heat exchanger respectively have corresponding fans; the water-to-water heat exchanger includes two flow paths, and the coolant in the battery cooling system and the energy storage inverter cooling system exchanges heat when flowing through the water-to-water heat exchanger.

[0008] Optionally, the operating modes of the above-mentioned energy storage thermal management system include: single battery cluster natural cooling mode, battery cluster and energy storage inverter simultaneous natural cooling mode, single battery cluster forced cooling mode, battery cluster forced cooling and energy storage inverter natural cooling mode, battery cluster and energy storage inverter forced cooling mode.

[0009] Optionally, in the natural cooling mode of the single battery cluster, the above-mentioned energy storage thermal management system is configured to: close the refrigerant circulation system, and connect the second interface of the first three-way valve to the third interface; start the first water pump, so that the low-temperature coolant absorbs heat in the battery cluster and becomes medium-temperature coolant, and transport the medium-temperature coolant to the first heat exchanger for forced convection heat exchange with the air to become low-temperature coolant, which is pressurized by the first water pump and enters the battery cluster for heat exchange; start the first fan assembly, so that the air completes forced heat exchange with the coolant in the first heat exchanger.

[0010] Optionally, when the battery cluster and the energy storage inverter are in natural cooling mode at the same time, the energy storage thermal management system is configured to: start the battery cooling system and the energy storage inverter cooling system, wherein the battery cooling system operates in the same manner as the natural cooling of the single battery cluster; start the second water pump in the energy storage inverter cooling system, connect the first interface of the second three-way valve to the second interface, absorb heat from the medium- and high-temperature coolant to produce high-temperature coolant, input the high-temperature coolant into the second heat exchanger to exchange heat with the air to produce medium- and high-temperature coolant, pressurize the medium- and high-temperature coolant through the second water pump, enter the energy storage inverter for heat exchange, and complete the cycle.

[0011] Optionally, in the forced cooling mode of the single battery cluster, the above-mentioned energy storage thermal management system is configured to: start the refrigerant circulation system and the battery cooling system; the high-temperature and high-pressure refrigerant compressed by the compressor enters the condenser to condense and dissipate heat, becoming a high-pressure medium-temperature liquid refrigerant; after throttling by the throttling component, it becomes a low-temperature and low-pressure liquid refrigerant and enters the evaporator, absorbs heat and evaporates to become a low-temperature and low-pressure vapor refrigerant; the low-temperature and low-pressure vapor refrigerant enters the compressor and is compressed to become a high-temperature and high-pressure gaseous refrigerant; the first fan component is started to make the air flow and complete forced convection heat exchange with the refrigerant in the condenser; the first interface of the first three-way valve is connected to the second interface, and the first water pump is started, and the low-temperature coolant absorbs heat in the battery cluster to become a medium-temperature coolant. After passing through the water-to-water heat exchanger and the first three-way valve, the medium-temperature coolant enters the evaporator, exchanges heat with the low-temperature refrigerant in the evaporator, and becomes a low-temperature coolant. After being pressurized by the first water pump, the low-temperature coolant enters the battery cluster to absorb heat, completing the cycle.

[0012] Optionally, in the battery cluster forced cooling and energy storage inverter natural cooling modes, the forced cooling modes of the refrigerant circulation system and the battery cooling system are the same as the above-mentioned single battery cluster forced cooling mode; the energy storage inverter cooling system is the same as the above-mentioned natural cooling mode.

[0013] Optionally, in the forced cooling mode of the battery cluster and the natural cooling mode of the energy storage inverter, the operating mode of the refrigerant circulation system and the battery cooling system is the same as the forced cooling mode of the single battery cluster mentioned above; the second interface of the second three-way valve is connected to the third interface; the medium and high temperature coolant absorbs heat in the energy storage inverter and becomes high temperature coolant; the high temperature coolant enters the second heat exchanger to exchange heat with the air and becomes medium and high temperature coolant, which is pressurized by the second water pump and enters the water-to-water heat exchanger, exchanges heat with the medium and low temperature coolant in the battery cooling system, and then enters the energy storage inverter to absorb heat, completing the cycle.

[0014] Optionally, the energy storage thermal management system further includes: an energy storage thermal cooling monitor; the energy storage thermal cooling monitor is configured to: collect in real time the battery cluster temperature change curve and the energy storage inverter temperature change curve of the battery cluster and the energy storage inverter within a preset time period; input the battery cluster temperature change curve and the energy storage inverter temperature change curve into a pre-trained temperature change prediction time series model to obtain the battery cluster temperature change prediction curve and the energy storage inverter temperature change prediction curve; in response to determining that abnormal temperature exists in the battery cluster temperature change prediction curve and / or the energy storage inverter temperature change prediction curve, generate abnormal temperature alarm information, and control the associated temperature alarm device to issue an alarm.

[0015] Optionally, before inputting the battery cluster temperature change curve and the energy storage inverter temperature change curve into a pre-trained temperature change prediction time series model to obtain the battery cluster temperature change prediction curve and the energy storage inverter temperature change prediction curve, the energy storage thermal cooling monitor is further configured to: obtain a temperature change information sample set, wherein the temperature change information sample includes: a battery cluster temperature change curve sample, an energy storage inverter temperature change curve sample, a battery cluster temperature sample label, and an energy storage inverter temperature sample label; select a target temperature change information sample from the temperature change information sample set; input the battery cluster temperature change curve sample and the energy storage inverter temperature change curve sample included in the target temperature change information sample into an initial In the temperature change prediction time series model, an initial temperature change prediction result is obtained, wherein the above-mentioned initial temperature change prediction result includes: an initial battery cluster temperature change prediction result and an initial energy storage inverter temperature change prediction result; a battery cluster temperature loss value between the above-mentioned initial battery cluster temperature change prediction result and the corresponding battery cluster temperature sample label is generated; an energy storage inverter temperature loss value between the above-mentioned initial energy storage inverter temperature change prediction result and the corresponding energy storage inverter temperature sample label is generated; in response to determining that the above-mentioned battery cluster temperature loss value is less than or equal to a first preset loss value, and the energy storage inverter temperature loss value is less than or equal to a second preset loss value, the above-mentioned initial temperature change prediction time series model is determined as the trained temperature change prediction time series model.

[0016] The present disclosure has the following beneficial effects: The energy storage thermal management system disclosed herein can simultaneously provide liquid cooling for both the energy storage battery cluster and the energy storage inverter (PCS), maintaining the energy storage battery cluster and PCS within a suitable operating temperature range. Furthermore, the system utilizes a single refrigerant system with two coolant circulation systems, resulting in a simpler system layout and greater stability and reliability. The battery cluster cooling system and the PCS cooling system are independent of each other, enabling the generation of coolant at different temperatures required for battery cluster cooling and PCS cooling within the same system. Multiple operating modes are possible, including natural cooling of a single battery cluster, simultaneous natural cooling of the battery cluster and PCS, forced cooling of a single battery cluster, forced cooling of the battery cluster and natural cooling of the PCS, and forced cooling of the battery cluster and PCS. The use of natural cooling can significantly reduce the energy consumption of the temperature control system. During forced cooling of the PCS, the high-temperature coolant is first cooled by air, and then reduced to the desired temperature through water-to-water heat exchange, resulting in greater energy efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other features, advantages, and aspects of the various embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. Throughout the drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and that components and elements are not necessarily drawn to scale.

[0018] Figure 1 is a system architecture diagram of some embodiments of the energy storage thermal management system according to the present disclosure;

[0019] Figure 2 is a schematic diagram of a natural cooling mode of a single battery cluster in an energy storage thermal management system according to the present disclosure;

[0020] Figure 3 is a schematic diagram of a simultaneous natural cooling mode of a battery cluster and an energy storage inverter in an energy storage thermal management system according to the present disclosure;

[0021] Figure 4 is a schematic diagram of a single battery cluster forced cooling mode in an energy storage thermal management system according to the present disclosure;

[0022] Figure 5 is a schematic diagram of the battery cluster forced cooling and energy storage inverter natural cooling modes in the energy storage thermal management system according to the present disclosure;

[0023] Figure 6 It is a principle diagram of the forced cooling mode of the battery cluster and energy storage inverter in the energy storage thermal management system according to the present disclosure. DETAILED DESCRIPTION

[0024] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments described herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are for illustrative purposes only and are not intended to limit the scope of protection of the present disclosure.

[0025] It should also be noted that, for ease of description, only the parts related to the invention are shown in the drawings. In the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0026] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0027] It should be noted that the modifications of "one" and "multiple" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, they should be understood as "one or more".

[0028] The names of the messages or information exchanged between multiple devices in the embodiments of the present disclosure are only used for illustrative purposes and are not used to limit the scope of these messages or information.

[0029] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0030] Figure 1 1 is a system principle diagram of some embodiments of the energy storage thermal management system according to the present disclosure, showing that the energy storage thermal management system according to the present disclosure includes: a refrigerant circulation system 1, a battery cooling system 2, and an energy storage inverter cooling system 3.

[0031] The refrigerant circulation system 1 comprises a compressor 101, a condenser 102, an evaporator 103, a throttle assembly 104, and a first fan assembly 105. The throttle assembly 104 may be a throttle. The compressor 101 is connected to the condenser 102 and the evaporator 103 through pipes. The first fan assembly 105 is located on one side of the condenser 102. The throttle assembly 104 is connected to the condenser 102 and the evaporator 103 through pipes.

[0032] The battery cooling system 2 includes: a first water pump 201, a water-to-water heat exchanger 202, a first three-way valve 203, a first heat exchanger 204, an ambient temperature sensor 205, a first water inlet temperature sensor 206, and a first water outlet temperature sensor 207. The ambient temperature sensor 205, the first water inlet temperature sensor 206, and the first water outlet temperature sensor 207 are all temperature sensors. Figure 1 The evaporator 103 is connected to the first three-way valve 203 and the first water pump 201 through pipelines; the first water outlet temperature sensor 207 is arranged on one side of the pipeline between the evaporator 103 and the first water pump 201; the water-to-water heat exchanger 202 is connected to the first three-way valve 203 through pipelines; the first heat exchanger 204 is connected to the first three-way valve 203 through pipelines; the ambient temperature sensor 205 is arranged on one side of the first heat exchanger 204; and the first water inlet temperature sensor 206 is arranged on one side of the connecting pipeline between the first heat exchanger 204 and the battery cluster.

[0033] The energy storage inverter cooling system 3 includes a second water pump 301, a second fan assembly 302, a second heat exchanger 303, a second three-way valve 304, a second return water temperature sensor 305, and an energy storage inverter (PCS). Both the first water pump 201 and the second water pump 301 are water pumps. The second fan assembly 302 is located on one side of the second heat exchanger 303; the second heat exchanger 303 is connected to the energy storage inverter (PCS) by piping; the energy storage inverter is connected to the second three-way valve 304 and the water-to-water heat exchanger 202 by piping; the second three-way valve 304 is connected to the water-to-water heat exchanger 202 by piping; and the second water pump 301 is connected to the second heat exchanger 303 and the second three-way valve 304 by piping. The second return water temperature sensor 305 is located on one side of the piping connecting the second heat exchanger 303 and the energy storage inverter.

[0034] The first three-way valve 203 and the second three-way valve 304 each have three ports; the first heat exchanger 204 and the second heat exchanger 303 are arranged side by side. The three ports of the first three-way valve 203 can be represented by a, b, and c. The three ports of the second three-way valve 304 can be represented by a, b, and c. a represents the first port; b represents the second port; and c represents the third port. The first three-way valve 203 and the second three-way valve 304 are both three-way valves. The first fan assembly 105 and the second fan assembly 302 are both fans.

[0035] When the second fan assembly 302 is in operation, the flowing air first passes through the first heat exchanger 204 and then passes through the second heat exchanger 303 .

[0036] The first heat exchanger 204 and the second heat exchanger 303 are arranged separately, and the first heat exchanger 204 and the second heat exchanger 303 respectively have corresponding fans; the first heat exchanger 204 and the second heat exchanger 303 are both heat exchangers.

[0037] Water-to-water heat exchanger 202 includes two flow paths. The coolants in battery cooling system 2 and energy storage inverter cooling system 3 exchange heat as they flow through water-to-water heat exchanger 202. The coolants in battery cooling system 2 and energy storage inverter cooling system 3 exchange heat only as they flow through water-to-water heat exchanger 202; the coolants do not mix.

[0038] In some embodiments, the operating modes of the above-mentioned energy storage thermal management system include: single battery cluster natural cooling mode, battery cluster and energy storage inverter simultaneous natural cooling mode, single battery cluster forced cooling mode, battery cluster forced cooling and energy storage inverter natural cooling mode, battery cluster and energy storage inverter forced cooling mode.

[0039] Optionally, the energy storage thermal management system further includes a processor that is in communication with the refrigerant circulation system, the battery cooling system, and the energy storage inverter cooling system. The processor may be a central processing unit (CPU).

[0040] Among them, in the natural cooling mode of the single battery cluster, the coolant flow direction refers to Figure 2 ;

[0041] In some embodiments, in the natural cooling mode of the battery cell cluster, the processor is configured to perform the following processing steps:

[0042] The refrigerant circulation system 1 is closed, and the second port b of the first three-way valve 203 is connected to the third port c.

[0043] The first water pump 201 is started, so that the low-temperature coolant absorbs heat in the battery cluster and becomes medium-temperature coolant. The medium-temperature coolant is transported to the first heat exchanger 204 for forced convection heat exchange with the air to become low-temperature coolant. The medium-temperature coolant is pressurized by the first water pump 201 and enters the battery cluster for heat exchange.

[0044] The second fan assembly 302 is started to force the air to exchange heat with the coolant in the first heat exchanger 204 .

[0045] Among them, when the battery cluster and energy storage inverter are in natural cooling mode at the same time, the coolant flow direction refers to Figure 3 ;

[0046] In some embodiments, when the battery cluster and the energy storage inverter are in natural cooling mode at the same time, the processor is configured to perform the following processing steps:

[0047] Start the battery cooling system 2 and the energy storage inverter cooling system 3. The battery cooling system 2 operates in the same manner as the natural cooling of the battery cluster. That is, the natural cooling mode of the battery cooling system 2 is the same as the natural cooling mode of the battery cluster.

[0048] The second water pump 301 in the energy storage inverter cooling system 3 is activated, connecting the first and second interfaces of the second three-way valve 304. The energy storage inverter absorbs heat from the medium- and high-temperature coolant, converting it into high-temperature coolant. This high-temperature coolant is then fed into the second heat exchanger 303, where it exchanges heat with air, converting it into medium- and high-temperature coolant. The second water pump 301 pressurizes the medium- and high-temperature coolant before it enters the energy storage inverter for heat exchange, completing the cycle. The energy storage inverter can be a PCS. The first and second interfaces of the second three-way valve 304 are designated a and b, respectively.

[0049] Among them, in the single battery cluster forced cooling mode, the flow direction of the refrigerant and coolant refers to Figure 4 ;

[0050] In some embodiments, in the battery cluster forced cooling mode, the processor is configured to perform the following processing steps:

[0051] Start the refrigerant circulation system 1 and the battery cooling system 2. The high-temperature, high-pressure refrigerant compressed by the compressor 101 enters the condenser 102, where it condenses and dissipates heat, becoming a high-pressure, medium-temperature liquid refrigerant. After being throttled by the throttling component 104, it becomes a low-temperature, low-pressure liquid refrigerant and enters the evaporator 103, where it absorbs heat and evaporates to become a low-temperature, low-pressure vapor refrigerant. The low-temperature, low-pressure vapor refrigerant enters the compressor 101 and is compressed to become a high-temperature, high-pressure gaseous refrigerant. Start the first fan component 105 to circulate air, completing forced convection heat exchange with the refrigerant in the condenser 102.

[0052] The first interface of the first three-way valve 203 is connected to the second interface, and the first water pump 201 is started. The low-temperature coolant absorbs heat in the battery cluster and becomes medium-temperature coolant. After the medium-temperature coolant passes through the water-to-water heat exchanger 202 and the first three-way valve 203, it enters the evaporator 103 and exchanges heat with the low-temperature refrigerant in the evaporator 103 to become low-temperature coolant. After being pressurized by the first water pump 201, the low-temperature coolant enters the battery cluster to absorb heat, completing the cycle. Among them, the first interface and the second interface of the first three-way valve 203 can be Figure 4 The a and b interfaces at the first three-way valve 203.

[0053] Among them, in the battery cluster forced cooling and energy storage inverter natural cooling mode, the refrigerant and coolant flow direction refer to Figure 5 ;

[0054] In some embodiments, the forced cooling mode of the refrigerant circulation system 1 and the battery cooling system 2 is the same as the forced cooling mode of the single battery cluster described above; the energy storage inverter cooling system 3 is the same as the natural cooling mode of the energy storage inverter described above. This will not be repeated here.

[0055] Among them, in the battery cluster forced cooling and energy storage inverter natural cooling mode, the refrigerant and coolant flow direction refer to Figure 6 .

[0056] In some embodiments, the operating mode of the refrigerant circulation system 1 and the battery cooling system 2 is the same as the above-mentioned single battery cluster forced cooling mode; the second interface of the second three-way valve 304 is connected to the third interface; the medium and high temperature coolant absorbs heat in the energy storage inverter and becomes high-temperature coolant; the high-temperature coolant enters the second heat exchanger 303 and exchanges heat with the air to become medium and high temperature coolant, which is pressurized by the second water pump 301 and enters the water-to-water heat exchanger 202. After exchanging heat with the medium and low temperature coolant in the battery cooling system 2, it enters the energy storage inverter to absorb heat, completing the cycle.

[0057] It should be noted that Figures 1-6 The batteries shown in the figure represent the battery clusters in the manual; Figures 1-6 The PCS shown in the figure all represent energy storage inverters.

[0058] Therefore, through the five operating modes, the following technical effects can be achieved:

[0059] First, the system is a single refrigerant system with two coolant circulation systems. The system layout is relatively simple and more stable and reliable.

[0060] Second, the battery cluster cooling system and the PCS cooling system are independent of each other. In the same system, coolants of different temperatures required for battery cluster cooling and PCS cooling can be generated.

[0061] Third, the system can achieve multiple different operating modes: natural cooling of a single battery cluster, natural cooling of the battery cluster and PCS at the same time, forced cooling of a single battery cluster, forced cooling of the battery cluster and natural cooling of the PCS, and forced cooling of the battery cluster and PCS. The application of natural cooling can significantly reduce the energy consumption of the temperature control system.

[0062] Fourth, when PCS is forced to cool, the high-temperature coolant is first cooled by air cooling, and then the temperature of the high-temperature coolant is reduced to the required temperature through water-to-water heat exchange, which is more energy-efficient.

[0063] In some embodiments, the processor is configured to perform the following processing steps:

[0064] The first step is to collect, in real time, the battery cluster temperature change curve and the energy storage inverter temperature change curve for the battery cluster and the energy storage inverter over a preset time period. For example, the temperature parameter change sequence of the battery cluster and the energy storage inverter can be collected from the ambient temperature sensor 205, the first water inlet temperature sensor 206, and the first water outlet temperature sensor 207 over a preset time period as the battery cluster temperature change curve and the energy storage inverter temperature change curve, respectively.

[0065] The second step is to input the battery cluster temperature change curve and the energy storage inverter temperature change curve into a pre-trained temperature change prediction time series model to obtain the battery cluster temperature change prediction curve and the energy storage inverter temperature change prediction curve. The temperature change prediction time series model can be a pre-trained time series model that takes the temperature change curve as input and outputs the temperature change prediction curve. The time period corresponding to the temperature change prediction curve is the same as the duration of the preset time period. For example, the temperature change prediction time series model can be an autoregressive moving average model (ARMA), a vector autoregressive moving average (VARMA) model, or an ARIMA model.

[0066] In a third step, in response to determining that an abnormal temperature exists in the battery cluster temperature change prediction curve and / or the energy storage inverter temperature change prediction curve, abnormal temperature alarm information is generated and associated temperature alarm devices are controlled to issue an alarm. For example, if a predicted temperature value outside a preset temperature range is included in the battery cluster temperature change prediction curve and / or the energy storage inverter temperature change prediction curve, an abnormal temperature alarm information including the abnormal temperature is generated. The temperature alarm device may be a voice alarm device (e.g., a speaker).

[0067] The temperature change prediction time series model can be trained through the following steps:

[0068] The first step is to obtain a set of temperature change information samples, which include: battery cluster temperature change curve samples, energy storage inverter temperature change curve samples, battery cluster temperature sample labels, and energy storage inverter temperature sample labels.

[0069] The second step is to select a target temperature change information sample from the temperature change information sample set. A temperature change information sample can be randomly selected from the temperature change information sample set as the target temperature change information sample.

[0070] In the third step, the target temperature change information samples, including the battery cluster temperature change curve samples and the energy storage inverter temperature change curve samples, are input into the initial temperature change prediction time series model to obtain the initial temperature change prediction results. The initial temperature change prediction results include the initial battery cluster temperature change prediction results and the initial energy storage inverter temperature change prediction results. The initial temperature change prediction time series model can be an untrained autoregressive moving average model (ARMA), vector autoregressive moving average (VARMA) model, or ARIMA model.

[0071] The fourth step is to generate a battery cluster temperature loss value between the initial battery cluster temperature change prediction result and the corresponding battery cluster temperature sample label. For example, first, the operator loss value between the initial battery cluster temperature change prediction result and the corresponding battery cluster temperature sample label can be determined using a preset operator loss function. Then, the error loss value between the initial battery cluster temperature change prediction result and the corresponding battery cluster temperature sample label can be determined using a preset error loss function. Next, the product of the operator difference value and the preset operator weight can be determined as the operator weight difference value. Then, the product of the error difference value and the preset error weight can be determined as the error weight difference value. Finally, the sum of the operator weight difference value and the error weight difference value can be determined as the battery cluster temperature loss value. The sum of the preset operator weight and the preset error weight is the preset total weight. For example, the preset operator weight can be 0.7, and the preset error weight can be 0.3. For example, the preset operator loss function can be a Sobel operator loss function. For example, the preset error loss function may be an MSE (mean-square error) loss function or a cross entropy loss function.

[0072] Step 5: Generate the energy storage inverter temperature loss value between the initial energy storage inverter temperature change prediction result and the corresponding energy storage inverter temperature sample label. The calculation method of the battery cluster temperature loss value can be referred to and will not be repeated here.

[0073] In step 6, in response to determining that the battery cluster temperature loss value is less than or equal to the first preset loss value, and the energy storage inverter temperature loss value is less than or equal to the second preset loss value, the initial temperature change prediction time series model is determined as the trained temperature change prediction time series model. The first preset loss value and the second preset loss value may be the same or different.

[0074] Therefore, a relatively accurate temperature change prediction curve can be obtained by using the trained temperature change prediction time series model. Therefore, using the trained temperature change prediction time series model, it is possible to determine whether the temperature change is normal and reduce safety risks.

[0075] The above descriptions are merely some preferred embodiments of the present disclosure and illustrate the underlying technical principles. Those skilled in the art should understand that the scope of the invention encompassed by the embodiments of the present disclosure is not limited to technical solutions formed by specific combinations of the aforementioned technical features. It also encompasses other technical solutions formed by any combination of the aforementioned technical features or their equivalents, without departing from the aforementioned inventive concept. For example, a technical solution formed by replacing the aforementioned features with (but not limited to) technical features with similar functions disclosed in the embodiments of the present disclosure.

Claims

1. An energy storage thermal management system, comprising: The refrigerant circulation system, battery cooling system and energy storage inverter cooling system are characterized by: The refrigerant circulation system comprises: a compressor, a condenser, an evaporator, a throttling assembly and a first fan assembly; wherein the compressor is connected to the condenser and the evaporator pipelines respectively; the first fan assembly is arranged on one side of the condenser; the throttling assembly is connected to the condenser and the evaporator pipelines respectively; The battery cooling system includes: a first water pump, a water-to-water heat exchanger, a first three-way valve, a first heat exchanger, an ambient temperature sensor, a first water inlet temperature sensor, and a first water outlet temperature sensor; wherein the first water pump is connected to the battery cluster pipeline; the evaporator is connected to the first three-way valve and the first water pump pipeline respectively; the first water outlet temperature sensor is arranged on one side of the pipeline between the evaporator and the first water pump; the water-to-water heat exchanger is connected to the first three-way valve pipeline; the first heat exchanger is connected to the first three-way valve pipeline; the ambient temperature sensor is arranged on one side of the first heat exchanger; and the first water inlet temperature sensor is arranged on one side of the connecting pipeline between the first heat exchanger and the battery cluster; The energy storage inverter cooling system includes: a second water pump, a second fan assembly, a second heat exchanger, a second three-way valve, a second return water temperature sensor, and an energy storage inverter; wherein the second fan assembly is arranged on one side of the second heat exchanger; the second heat exchanger is connected to the energy storage inverter pipeline; the energy storage inverter is respectively connected to the second three-way valve and the water-to-water heat exchanger pipeline; the second three-way valve is connected to the water-to-water heat exchanger pipeline; the second water pump is respectively connected to the second heat exchanger and the second three-way valve pipeline; the second return water temperature sensor is arranged on one side of the connecting pipeline between the second heat exchanger and the energy storage inverter; The first three-way valve and the second three-way valve each have three interfaces; the first heat exchanger and the second heat exchanger are arranged side by side; When the second fan assembly is in operation, the flowing air first passes through the first heat exchanger and then passes through the second heat exchanger; The first heat exchanger and the second heat exchanger are arranged separately, and the first heat exchanger and the second heat exchanger are respectively provided with corresponding fans; The water-to-water heat exchanger includes two flow paths. The coolant in the battery cooling system and the energy storage inverter cooling system exchanges heat when flowing through the water-to-water heat exchanger. The operation modes of the energy storage thermal management system include: single battery cluster natural cooling mode, battery cluster and energy storage inverter simultaneous natural cooling mode, single battery cluster forced cooling mode, battery cluster forced cooling and energy storage inverter natural cooling mode, battery cluster and energy storage inverter forced cooling mode; In the single battery cluster forced cooling mode, the processor is configured to perform the following processing steps: Start the refrigerant circulation system and the battery cooling system. The high-temperature, high-pressure refrigerant compressed by the compressor enters the condenser, where it condenses and dissipates heat, becoming a high-pressure, medium-temperature liquid refrigerant. After being throttled by the throttling component, it becomes a low-temperature, low-pressure liquid refrigerant and enters the evaporator, where it absorbs heat and evaporates to become a low-temperature, low-pressure vapor refrigerant. The low-temperature, low-pressure vapor refrigerant enters the compressor and is compressed to become a high-temperature, high-pressure gaseous refrigerant. Start the first fan assembly to circulate air, completing forced convection heat exchange with the refrigerant in the condenser. The first port of the first three-way valve is connected to the second port, and the first water pump is started. The low-temperature coolant absorbs heat in the battery cluster and becomes medium-temperature coolant. The medium-temperature coolant passes through the water-to-water heat exchanger and the first three-way valve, then enters the evaporator, exchanges heat with the low-temperature refrigerant in the evaporator, and becomes low-temperature coolant. The low-temperature coolant is pressurized by the first water pump and enters the battery cluster to absorb heat, completing the cycle. In the forced cooling mode of the battery cluster and the natural cooling mode of the energy storage inverter, the operating mode of the refrigerant circulation system and the battery cooling system is the same as that of the forced cooling mode of the single battery cluster; the second interface of the second three-way valve is connected to the third interface; the medium and high temperature coolant absorbs heat in the energy storage inverter and becomes high temperature coolant; the high temperature coolant enters the second heat exchanger to exchange heat with the air and becomes medium and high temperature coolant, which is pressurized by the second water pump and enters the water-to-water heat exchanger, exchanges heat with the medium and low temperature coolant in the battery cooling system, and then enters the energy storage inverter to absorb heat, completing the cycle.

2. The energy storage thermal management system according to claim 1, characterized in that: The energy storage thermal management system further includes a processor; the processor is in communication with the refrigerant circulation system, the battery cooling system, and the energy storage inverter cooling system; In the natural cooling mode of the battery cluster, the processor is configured to perform the following processing steps: The refrigerant circulation system is closed, and the second port of the first three-way valve is connected to the third port; The first water pump is started, causing the low-temperature coolant to absorb heat in the battery cluster and become medium-temperature coolant. The medium-temperature coolant is then transported to the first heat exchanger for forced convection heat exchange with air to become low-temperature coolant. The low-temperature coolant is then pressurized by the first water pump and enters the battery cluster for heat exchange. The second fan assembly is started to force the air to exchange heat with the coolant in the first heat exchanger.

3. The energy storage thermal management system according to claim 2, characterized in that: When the battery cluster and the energy storage inverter are in natural cooling mode at the same time, the processor is configured to perform the following processing steps: Start the battery cooling system and the energy storage inverter cooling system. The battery cooling system operates in the same way as the natural cooling of the single battery cluster. The second water pump in the energy storage inverter cooling system is started, and the first interface of the second three-way valve is connected to the second interface. The energy storage inverter absorbs heat from the medium- and high-temperature coolant to produce high-temperature coolant. The high-temperature coolant is input into the second heat exchanger to exchange heat with the air to produce medium- and high-temperature coolant. The medium- and high-temperature coolant is pressurized by the second water pump and enters the energy storage inverter for heat exchange, completing the cycle.

4. The energy storage thermal management system according to claim 3, characterized in that: In the battery cluster forced cooling and energy storage inverter natural cooling modes, the forced cooling mode of the refrigerant circulation system and the battery cooling system is the same as the single battery cluster forced cooling mode; the energy storage inverter cooling system is the same as the natural cooling mode.

5. The energy storage thermal management system according to claim 2, characterized in that: The processor is further configured to perform the following processing steps: Real-time collection of the battery cluster temperature change curve and the energy storage inverter temperature change curve of the battery cluster and the energy storage inverter within a preset time period; Inputting the battery cluster temperature change curve and the energy storage inverter temperature change curve into a pre-trained temperature change prediction time series model to obtain a battery cluster temperature change prediction curve and an energy storage inverter temperature change prediction curve; In response to determining that abnormal temperature exists in the battery cluster temperature change prediction curve and / or the energy storage inverter temperature change prediction curve, abnormal temperature alarm information is generated, and the associated temperature alarm device is controlled to issue an alarm.

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