Immersed energy storage temperature control method and energy storage cabinet

Abstract

The present invention relates to a field of energy storage, and specifically discloses an immersion energy storage temperature control method and energy storage cabinet, which detects the cell temperature of each layer of battery packs in real time; when the cell temperature of all battery packs is less than the basic temperature threshold, if the difference between the cell temperatures of two adjacent layers of battery packs exceeds the first temperature threshold, a first temperature control strategy is used for temperature control; if the difference between the cell temperatures of the top and bottom battery packs exceeds the second temperature threshold, a second temperature control strategy is used for temperature control. The present invention performs temperature control according to the temperature difference between battery packs, saves energy, improves the temperature regulation effect, achieves temperature balance, and improves battery efficiency and safety.

Description

Technical Field

[0001] This invention relates to the field of energy storage, specifically to a method for temperature control of immersion energy storage and an energy storage cabinet. Background Technology

[0002] In energy storage systems, the battery pack, as the core component for energy storage, directly affects the operational efficiency and reliability of the entire system through its performance stability and safety. However, during actual operation, due to the complexity of internal chemical reactions and the influence of external environmental factors, uneven temperature distribution often occurs within the battery pack, resulting in significant temperature differences at different locations. These temperature variations not only affect battery performance and lifespan but can also trigger safety issues such as thermal runaway.

[0003] Traditional energy storage systems often employ air cooling or natural heat dissipation for temperature control. However, these methods often struggle to achieve uniform temperature control when dealing with large-scale, high-density battery pack arrays. In submerged energy storage systems, the battery packs are directly immersed in insulating coolant, improving heat dissipation efficiency. However, traditional liquid-cooled temperature control strategies are relatively simple, typically only monitoring and controlling the temperature of individual battery cells within each pack. This results in suboptimal temperature control, making it difficult to ensure temperature uniformity and consequently affecting battery efficiency and safety. Summary of the Invention

[0004] To address the aforementioned issues, this invention provides an immersion energy storage temperature control method and energy storage cabinet, which controls the temperature based on the temperature difference between battery packs, thereby saving energy, improving temperature regulation, achieving temperature balance, and enhancing battery efficiency and safety.

[0005] In a first aspect, the technical solution of the present invention provides a submersible energy storage temperature control method, comprising the following steps:

[0006] Real-time monitoring of cell temperature in each layer of the battery pack;

[0007] Determine if the cell temperature of the battery pack exceeds the baseline temperature threshold;

[0008] If present, increase the liquid cooling flow rate of the battery pack whose cell temperature exceeds the base temperature threshold until its cell temperature is below the base temperature threshold.

[0009] If not, detect the temperature difference between the cells of two adjacent battery packs, and the temperature difference between the cells of the top and bottom battery packs.

[0010] If the temperature difference between the cells of two adjacent battery packs exceeds a first temperature threshold, a first temperature control strategy is adopted for temperature regulation; if the temperature difference between the cells of the top and bottom battery packs exceeds a second temperature threshold, a second temperature control strategy is adopted for temperature regulation.

[0011] In one optional implementation, a first temperature control strategy is used for temperature regulation, specifically including:

[0012] The difference level of the temperature difference between cells in two adjacent battery packs;

[0013] Retrieve the mapping relationship between the difference level and the flow rate adjustment step size, and denote it as the first mapping relationship;

[0014] Based on the retrieved first mapping relationship, obtain the flow adjustment step size that matches the difference level;

[0015] Increase the liquid cooling flow rate of the layer with higher cell temperature according to the flow rate adjustment step, while decrease the liquid cooling flow rate of the layer with lower cell temperature according to the flow rate adjustment step.

[0016] After adjusting the liquid cooling flow rate for a preset time, if the temperature difference between the cells of two adjacent battery packs is still not lower than the first temperature threshold, the liquid cooling flow rate of the cell with the higher temperature will be increased by the flow rate adjustment step, while the liquid cooling flow rate of the cell with the lower temperature will be decreased by the flow rate adjustment step, and the heat sink power of the liquid cooling component will be increased until the temperature difference between the cells is lower than the first temperature threshold.

[0017] In one optional implementation, a second temperature control strategy is used for temperature regulation, specifically including:

[0018] The difference level of the temperature difference between the cells in the top and bottom layers of the battery pack;

[0019] The mapping relationship between the difference level and the flow rate adjustment step size is retrieved and denoted as the second mapping relationship;

[0020] Based on the retrieved second mapping relationship, obtain the flow adjustment step size that matches the difference level;

[0021] The battery packs are divided into upper battery packs and lower battery packs according to their numbers;

[0022] If the cell temperature of the top battery pack is higher than that of the bottom battery pack, the liquid cooling flow rate of the top battery pack will be increased according to the flow rate adjustment step, while the liquid cooling flow rate of the bottom battery pack will be decreased according to the flow rate adjustment step.

[0023] If the cell temperature of the top battery pack is lower than that of the bottom battery pack, the liquid cooling flow rate of the top battery pack will be reduced by the flow rate adjustment step, while the liquid cooling flow rate of the bottom battery pack will be increased by the flow rate adjustment step.

[0024] After adjusting the liquid cooling flow rate for a preset time, if the temperature difference between the cells of the top and bottom battery packs is still not lower than the second temperature threshold, the flow rate will continue to be adjusted according to the flow rate adjustment step size, and the heat sink power of the liquid cooling component will be increased until the temperature difference between the cells is lower than the first temperature threshold.

[0025] Secondly, the technical solution of the present invention provides an immersion energy storage cabinet, including a cabinet body and a cabinet door, wherein a first space, a second space and a third space are arranged sequentially from top to bottom inside the cabinet body;

[0026] The first space contains a multi-layered battery pack arranged vertically; the second space contains an energy storage converter and an energy storage control system; and the third space contains a liquid cooling assembly.

[0027] The energy storage control system implements any of the above-mentioned immersion energy storage temperature control methods.

[0028] In one alternative implementation, the energy storage control system includes a battery management subsystem and an energy management subsystem; wherein the battery management subsystem performs the immersion energy storage temperature control method described in any of the preceding embodiments.

[0029] In an optional implementation, a dehumidifier is also installed inside the cabinet.

[0030] In one alternative implementation, an emergency stop button is provided on the cabinet door.

[0031] In one alternative implementation, an indicator light panel is provided on the cabinet door.

[0032] This invention provides an immersion energy storage temperature control method and energy storage cabinet, which, compared to existing technologies, has the following advantages: First, the temperature of the cells in each battery pack is detected. Temperature control strategies are then formulated based on the temperature differences between adjacent layers and between the top and bottom layers to achieve temperature balance among the cells in each battery pack layer. This invention controls temperature based on the temperature differences between battery packs, saving energy, improving temperature regulation, achieving temperature balance, and enhancing battery efficiency and safety. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of a submersible energy storage temperature control method provided in an embodiment of the present invention.

[0035] Figure 2 This is a schematic diagram of an immersion energy storage cabinet structure provided in an embodiment of the present invention.

[0036] In the diagram, 1-liquid cooling component, 2-energy storage converter, 3-energy storage control system, 4-battery pack, 5-emergency stop button, 6-indicator panel, 7-dehumidifier. Detailed Implementation

[0037] To enable those skilled in the art to better understand the present invention, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0039] Figure 1 This is a schematic diagram of a submersible energy storage temperature control method provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the method includes the following steps.

[0040] S1, real-time monitoring of the cell temperature of each layer of battery pack 4.

[0041] The purpose of this step is to test the temperature of the cells in each battery pack 4.

[0042] S2, determine whether the cell temperature of battery pack 4 exceeds the basic temperature threshold.

[0043] First, determine whether the cell temperature of each battery pack 4 exceeds the basic temperature threshold to ensure that the cell temperature of each battery pack 4 is within the basic temperature threshold range.

[0044] S3, if present, increase the liquid cooling flow rate of battery pack 4 whose cell temperature exceeds the base temperature threshold until its cell temperature is below the base temperature threshold.

[0045] The purpose of this step is to ensure that the cell temperature of each battery pack 4 is controlled within the basic temperature threshold. If it exceeds the threshold, the liquid cooling flow rate is increased to reduce the cell temperature, ensuring that the battery pack 4 can operate normally and efficiently.

[0046] S4, if not present, detect the temperature difference between the cells of two adjacent battery packs 4, and the temperature difference between the cells of the top and bottom battery packs 4.

[0047] While ensuring that the cell temperature of each battery pack 4 does not exceed the basic temperature threshold, the temperature difference between the cells of two adjacent battery packs 4, as well as the temperature difference between the cells of the top and bottom battery packs 4, are detected to ensure that the cell temperature of the battery pack 4 remains balanced and to further improve battery efficiency.

[0048] S5, if the temperature difference between the cells of two adjacent battery packs 4 exceeds the first temperature threshold, the first temperature control strategy is adopted for temperature regulation; if the temperature difference between the cells of the top and bottom battery packs 4 exceeds the second temperature threshold, the second temperature control strategy is adopted for temperature regulation.

[0049] If the temperature difference between the cells of two adjacent battery packs 4 exceeds a first temperature threshold, a first temperature control strategy is adopted for temperature regulation. This embodiment formulates a temperature control strategy based on the cell temperatures of the battery packs 4 between the upper and lower adjacent layers to achieve temperature balance among the cells in the battery packs 4. For example, the temperature difference between the upper and lower cell layers is <1.5℃; otherwise, the first temperature control strategy is executed. Specifically, this includes the following steps.

[0050] S5.1.1, Detect the temperature difference level of the cells in two adjacent battery packs 4.

[0051] S5.1.2, retrieve the mapping relationship between the difference level and the flow rate adjustment step size, and denot it as the first mapping relationship.

[0052] Different temperature difference levels are pre-configured to map flow rate adjustment steps; the higher the temperature difference level, the larger the flow rate adjustment step. It should be noted that different temperature difference levels are configured; the larger the temperature difference, the higher the temperature difference level.

[0053] S5.1.3, based on the retrieved first mapping relationship, obtain the flow adjustment step size that matches the difference level.

[0054] S5.1.4, increase the liquid cooling flow rate of the layer with higher cell temperature according to the flow rate adjustment step size, and decrease the liquid cooling flow rate of the layer with lower cell temperature according to the flow rate adjustment step size.

[0055] S5.1.5 After adjusting the liquid cooling flow rate for a preset time, if the temperature difference between the cells of two adjacent battery packs 4 is still not lower than the first temperature threshold, the liquid cooling flow rate of the cell with the higher cell temperature will be increased according to the flow rate adjustment step, while the liquid cooling flow rate of the cell with the lower cell temperature will be decreased according to the flow rate adjustment step, and the heat sink power of the liquid cooling component will be increased until the temperature difference between the cells is lower than the first temperature threshold.

[0056] In this embodiment, the liquid cooling flow rate is first adjusted according to the flow rate adjustment step size, and the adjustment time is pre-configured. If the temperature difference is adjusted to the low-pressure first temperature threshold after the adjustment time, the adjustment ends. Otherwise, the liquid cooling flow rate is further adjusted according to the flow rate adjustment step size. It should be noted that the liquid cooling flow rate is adjusted again according to the flow rate adjustment step size after the initial adjustment, while the heat sink power is increased to quickly adjust the temperature difference to meet the requirements and ensure battery temperature balance.

[0057] If the temperature difference between the cells in the top and bottom layers of the battery pack 4 exceeds a second temperature threshold, a second temperature control strategy is adopted for temperature regulation. In this embodiment, in addition to formulating a temperature control strategy based on the temperature difference between adjacent layers, a temperature control strategy is also formulated based on the temperature difference between the top and bottom layers to achieve overall temperature balance and improve heat dissipation. For example, if the temperature difference between the top and bottom layers of the cells is <2.5℃, the second temperature control strategy is executed. Specifically, this includes the following steps.

[0058] S5.2.1, Detects the temperature difference level between the cells in the top and bottom battery packs 4.

[0059] S5.2.2, retrieve the mapping relationship between the difference level and the flow rate adjustment step size, denoted as the second mapping relationship.

[0060] S5.2.3, based on the retrieved second mapping relationship, obtain the flow adjustment step size that matches the difference level.

[0061] Different temperature difference levels are pre-configured to map flow rate adjustment steps; the higher the temperature difference level, the larger the flow rate adjustment step. It should be noted that different temperature difference levels are configured; the larger the temperature difference, the higher the temperature difference level.

[0062] S5.2.4, the battery pack 4 is divided into upper battery pack 4 and lower battery pack 4 according to the number.

[0063] It should be noted that each battery pack 4 is pre-labeled. For example, the battery pack 4 with three layers on top is called the upper battery pack 4, and the battery pack 4 with two layers on the bottom is called the lower battery pack 4. In this embodiment, when adjusting the temperature difference between the bottom and top battery packs 4, the upper and lower battery packs 4 are treated as a whole for flow regulation, which improves the temperature regulation efficiency and ensures overall temperature balance.

[0064] S5.2.5 If the cell temperature of the top battery pack 4 is greater than that of the bottom battery pack 4, the liquid cooling flow rate of the top battery pack 4 is increased according to the flow rate adjustment step, while the liquid cooling flow rate of the bottom battery pack 4 is decreased according to the flow rate adjustment step.

[0065] S5.2.6 If the cell temperature of the top battery pack 4 is lower than that of the bottom battery pack 4, the liquid cooling flow rate of the top battery pack 4 is reduced by the flow rate adjustment step, while the liquid cooling flow rate of the bottom battery pack 4 is increased by the flow rate adjustment step.

[0066] S5.2.7 After adjusting the liquid cooling flow rate for a preset time, if the temperature difference between the cells of the top and bottom battery packs 4 is still not lower than the second temperature threshold, then continue to adjust the flow rate according to the flow rate adjustment step size and increase the heat sink power of the liquid cooling component until the temperature difference between the cells is lower than the first temperature threshold.

[0067] In this embodiment, the liquid cooling flow rate is first adjusted according to the flow rate adjustment step size, and the adjustment time is pre-configured. If the temperature difference is adjusted to the low-pressure second temperature threshold after the adjustment time, the adjustment ends. Otherwise, the liquid cooling flow rate is further adjusted according to the flow rate adjustment step size. It should be noted that the liquid cooling flow rate is adjusted again according to the flow rate adjustment step size after the initial adjustment, while the heat sink power is increased to quickly adjust the temperature difference to meet the requirements and ensure battery temperature balance.

[0068] Figure 2 This is a schematic diagram of an immersion energy storage cabinet structure provided in an embodiment of the present invention, as shown below. Figure 2 As shown, the energy storage cabinet in this embodiment includes a cabinet body and a cabinet door. Three spaces are arranged inside the cabinet from top to bottom to achieve a rational layout of the internal space. From top to bottom, these are the first space, the second space, and the third space.

[0069] The first space contains a multi-layered battery pack 4 arranged vertically. The battery pack 4 is completely submerged in a specially formulated static coolant, effectively isolating it from direct contact with the external environment and reducing the impact of external factors on battery performance. Simultaneously, the coolant, acting as a heat transfer medium, rapidly absorbs the heat generated by the battery pack 4. A liquid cooling plate is installed at the bottom of the battery pack 4, which is in direct contact with the static coolant. When the battery pack 4 is operating, the generated heat is transferred to the liquid cooling plate through its bottom. The liquid cooling plate, utilizing its own thermal conductivity, further transfers the heat to the coolant. The coolant, through thermal conduction, evenly distributes and carries away the heat.

[0070] The second space is equipped with an energy storage converter 2 and an energy storage control system 3. The energy storage control system 3 includes a battery management subsystem and an energy management subsystem. The battery management subsystem (BMS) optimizes and comprehensively manages the battery's operating status, and executes the immersion energy storage temperature control method described in the above embodiment.

[0071] Liquid cooling unit 1 is installed in the third space. The liquid cooling unit is connected to the liquid cooling plate and is responsible for dissipating heat from the coolant outside the cabinet. The liquid cooling unit uses a circulating pump to drive the coolant flow, carrying heat to the radiator inside the unit. The radiator dissipates heat into the air through natural convection or forced convection, thus achieving external heat exchange. Simultaneously, the liquid cooling unit also has a coolant circulation and filtration function to ensure the cleanliness of the coolant and its heat transfer efficiency.

[0072] The cabinet is also equipped with a dehumidifier 7 for dehumidifying the interior and preventing condensation. The cabinet door is equipped with an emergency stop button 5 and an indicator light panel 6. The emergency stop button 5 is used for external emergency stop, and the indicator light panel 6 is used for power, operation, and fault indication.

[0073] The above-disclosed embodiments are merely preferred embodiments of the present invention, but the present invention is not limited thereto. Any non-creative variations that can be conceived by those skilled in the art, as well as any improvements and modifications made without departing from the principles of the present invention, should fall within the protection scope of the present invention.

Claims

1. An immersion energy storage temperature control method, characterized in that: The energy storage cabinet is equipped with multi-layer battery packs arranged up and down. The battery packs are completely immersed in the static coolant. A liquid cooling plate is installed at the bottom of the battery pack, which is in direct contact with the static coolant. The energy storage cabinet is also equipped with a liquid cooling component, which is connected to the liquid cooling plate and is responsible for discharging the heat in the coolant to the outside of the cabinet. The method comprises the following steps: Real-time detection of the cell temperature of each layer of battery pack; Determine whether the temperature of the battery cell of the battery pack exceeds the basic temperature threshold; If present, increase the liquid cooling flow of the battery pack whose cell temperature exceeds the basic temperature threshold until its cell temperature is lower than the basic temperature threshold; If not present, detect the difference between the cell temperatures of two adjacent battery packs, and the difference between the cell temperatures of the top and bottom battery packs; If the temperature difference between the cells of two adjacent battery packs exceeds a first temperature threshold, a first temperature control strategy is used for temperature control; if the temperature difference between the cells of the top and bottom battery packs exceeds a second temperature threshold, a second temperature control strategy is used for temperature control; Among them, the first temperature control strategy is adopted to control the temperature, which specifically includes: Detect the difference level between the cell temperatures of two adjacent battery packs; Retrieving a mapping relationship between a difference level and a flow adjustment step length, which is recorded as a first mapping relationship; According to the retrieved first mapping relationship, a flow adjustment step length adapted to the difference level is obtained; Increase the liquid cooling flow rate of the layer with higher cell temperature according to the flow adjustment step length, and reduce the liquid cooling flow rate of the layer with lower cell temperature according to the flow adjustment step length; After adjusting the liquid cooling flow for a preset time, if the difference in cell temperature between two adjacent layers of battery packs is still not lower than the first temperature threshold, the liquid cooling flow of the layer with a higher cell temperature continues to be increased according to the flow adjustment step, while the liquid cooling flow of the layer with a lower cell temperature is reduced according to the flow adjustment step, and the radiator power of the liquid cooling component is increased until the difference in cell temperature is lower than the first temperature threshold; Among them, the second temperature control strategy is used for temperature control, which specifically includes: Detect the difference level between the top and bottom battery pack cell temperatures; Retrieving a mapping relationship between a difference level and a flow adjustment step length, which is recorded as a second mapping relationship; According to the retrieved second mapping relationship, a flow adjustment step length adapted to the difference level is obtained; Divide the battery packs into upper battery packs and lower battery packs according to the labels; If the cell temperature of the top battery pack is greater than that of the bottom battery pack, the liquid cooling flow rate of the upper battery pack is increased according to the flow adjustment step length, and the liquid cooling flow rate of the lower battery pack is reduced according to the flow adjustment step length; If the cell temperature of the top battery pack is lower than that of the bottom battery pack, the liquid cooling flow rate of the upper battery pack is reduced according to the flow adjustment step length, and the liquid cooling flow rate of the lower battery pack is increased according to the flow adjustment step length; After adjusting the liquid cooling flow for a preset time, if the difference in battery cell temperature between the top and bottom battery packs is still not lower than the second temperature threshold, continue to adjust the flow according to the flow adjustment step and increase the radiator power of the liquid cooling component until the difference in battery cell temperature is lower than the first temperature threshold.

2. An immersion energy storage cabinet, characterized in that: The cabinet comprises a cabinet body and a cabinet door, wherein a first space, a second space and a third space are sequentially arranged in the cabinet body from top to bottom; The first space is provided with a multi-layer battery pack arranged up and down; the second space is provided with an energy storage converter and an energy storage control system; the third space is provided with a liquid cooling component; Wherein, the energy storage control system executes the immersion energy storage temperature control method described in claim 1.

3. The submersible energy storage cabinet according to claim 2, characterized in that: The energy storage control system includes a battery management subsystem and an energy management subsystem; wherein the battery management subsystem executes the immersion energy storage temperature control method described in claim 1.

4. The submersible energy storage cabinet according to claim 3, characterized in that: A dehumidifier is also provided in the cabinet.

5. The submersible energy storage cabinet according to claim 3, characterized in that: An emergency stop button is provided on the cabinet door.

6. The submersible energy storage cabinet according to claim 3, characterized in that: An indicator light panel is arranged on the cabinet door.

Images