Battery pack and energy storage system

Abstract

The invention provides a battery pack and an energy storage system, and relates to the technical field of new energy, the battery pack comprises a gas cylinder assembly, a sensor assembly, a battery control unit and an exhaust valve, the battery control unit is used for determining the dew point temperature in the battery pack according to monitoring data of the sensor assembly; under the condition that the dew point temperature is greater than a first preset temperature, controlling the gas cylinder assembly to introduce dry gas into the battery pack, and exhausting the gas in the battery pack to the outside of the battery pack through the exhaust valve; and under the condition that the dew point temperature is smaller than the second preset temperature, the gas cylinder assembly is controlled to stop introducing the dry gas into the battery pack. According to the battery pack, the condensation risk can be accurately judged, dry gas is controlled to be introduced into the gas cylinder assembly, then wet gas is exhausted through the exhaust valve, the battery pack is effectively prevented from being damaged by the condensation phenomenon, and the safety of the battery pack is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of new energy technology, and in particular to a battery pack and an energy storage system. Background Art

[0002] In the new energy field, multiple battery modules are assembled into a battery pack. During operation, the battery pack generates a large amount of heat, which causes the temperature of the battery cells to rise, affecting the safety and service life of the battery pack.

[0003] At present, the main cooling methods for battery packs are direct cooling and liquid cooling. When using liquid cooling or direct cooling, the liquid supply temperature in the liquid cooling pipe is very low, and condensation is easily generated in the liquid cooling pipe and electric cooling plate in the battery pack, bringing safety risks and affecting the safety of the battery pack. Summary of the Invention

[0004] Embodiments of the present application provide a battery pack and an energy storage system to solve the problem of condensation easily generated inside the battery pack.

[0005] In a first aspect, the present application provides a battery pack, comprising:

[0006] A gas cylinder assembly, a sensor assembly, a battery control unit, and an exhaust valve, wherein the gas cylinder assembly and the sensor assembly are both communicatively connected to the battery control unit; the exhaust valve is mounted on a side wall of the battery pack and is used to discharge the internal gas of the battery pack into the external environment;

[0007] The battery control unit is used to:

[0008] Acquiring monitoring data within the battery pack detected by the sensor assembly, and determining a dew point temperature within the battery pack based on the monitoring data;

[0009] When the dew point temperature is greater than a first preset temperature, controlling the gas cylinder assembly to pass dry gas into the battery pack, and exhausting the gas in the battery pack to the outside of the battery pack through the exhaust valve;

[0010] When the dew point temperature is lower than a second preset temperature, the gas cylinder assembly is controlled to stop supplying dry gas into the battery pack.

[0011] In one possible design, the sensor assembly is disposed in the battery pack, and the sensor assembly includes a temperature sensor, a humidity sensor, and a pressure sensor;

[0012] The battery control unit is configured to, when determining the dew point temperature in the battery pack based on the monitoring data, specifically:

[0013] Acquire the temperature value detected by the temperature sensor, the humidity value detected by the humidity sensor, and the pressure value detected by the pressure sensor;

[0014] A dew point temperature in the battery pack is determined based on the temperature value, the humidity value, and the pressure value.

[0015] In one possible design, the battery control unit, when determining the dew point temperature in the battery pack based on the temperature value, the humidity value, and the pressure value, is specifically configured to:

[0016] The dew point temperature in the battery pack is obtained by querying a preset condensation table according to the temperature value, the humidity value, and the pressure value; wherein the preset condensation table includes a mapping relationship between temperature, humidity, and pressure and the dew point temperature.

[0017] In one possible design, the gas cylinder assembly is disposed inside the battery pack, and the gas cylinder assembly includes a gas cylinder and a solenoid valve;

[0018] The battery control unit controls the gas cylinder assembly to introduce dry gas into the battery pack when the dew point temperature is greater than a first preset temperature, specifically for:

[0019] When the dew point temperature is greater than a first preset temperature, the solenoid valve is controlled to open, and the gas cylinder discharges dry gas into the battery pack;

[0020] The battery control unit controls the gas cylinder assembly to stop supplying dry gas into the battery pack when the dew point temperature is lower than a second preset temperature, specifically for:

[0021] When the dew point temperature is lower than a second preset temperature, the solenoid valve is controlled to close, and the gas cylinder stops discharging dry gas into the battery pack.

[0022] In one possible design, the sensor assembly includes a pressure sensor; the exhaust valve is an electromagnetic exhaust valve, and the electromagnetic exhaust valve is communicatively connected to the battery control unit;

[0023] The battery control unit is further used for:

[0024] Obtaining a battery pack pressure value detected by the pressure sensor;

[0025] When the battery pack pressure value is greater than a first preset pressure value, the electromagnetic exhaust valve is controlled to open.

[0026] In one possible design, the battery control unit is further configured to:

[0027] When the battery pack pressure value is less than a second preset pressure value, controlling the gas cylinder assembly to discharge dry gas into the battery pack;

[0028] When the battery pack pressure value is greater than a third preset pressure value, the gas cylinder assembly is controlled to stop discharging dry gas into the battery pack; wherein, the first preset pressure value is greater than the third preset pressure value, and the third preset pressure value is greater than the second preset pressure value.

[0029] In one possible design, the exhaust valve is an explosion-proof one-way valve; when the pressure value inside the battery pack is greater than the external environmental pressure value, the explosion-proof one-way valve opens and the gas in the battery pack is discharged to the outside of the battery pack.

[0030] In one possible design, the sensor assembly further includes: a condensation sensor, the condensation sensor being disposed inside the battery pack;

[0031] The battery control unit is further used for:

[0032] obtaining a condensation state in the battery pack detected by the condensation sensor;

[0033] When the condensation state indicates that condensation exists, the gas cylinder assembly is controlled to pass dry gas into the battery pack, and the dry gas in the battery pack is discharged to the outside of the battery pack through the exhaust valve.

[0034] In one possible design, it also includes:

[0035] An air duct and a fan, both of which are disposed inside the battery pack, the fan being disposed correspondingly to the position of the exhaust valve, one end of the air duct being disposed correspondingly to the exhaust port of the gas cylinder assembly, and the other end being connected to the fan; the fan being communicatively connected to the battery control unit;

[0036] The battery control unit, after controlling the gas cylinder assembly to pass dry gas into the battery pack, is further used to: control the fan to turn on.

[0037] In a second aspect, the present application provides an energy storage system, comprising: a plurality of battery packs as described in any one of the first aspects.

[0038] An embodiment of the present application provides a battery pack and energy storage system, comprising: a gas cylinder assembly, a sensor assembly, a battery control unit, and an exhaust valve. The gas cylinder assembly and the sensor assembly are both communicatively connected to the battery control unit. The exhaust valve is mounted on the side wall of the battery pack and is used to discharge the internal gas of the battery pack into the external environment. The battery control unit is used to obtain monitoring data within the battery pack detected by the sensor assembly and determine the dew point temperature within the battery pack based on the monitoring data. When the dew point temperature is greater than a first preset temperature, the gas cylinder assembly is controlled to introduce dry gas into the battery pack, and the gas within the battery pack is discharged to the outside of the battery pack through the exhaust valve. When the dew point temperature is less than a second preset temperature, the gas cylinder assembly is controlled to stop introducing dry gas into the battery pack. The dew point temperature within the battery pack is determined using the monitoring data of the sensor assembly. Based on the dew point temperature, the first preset temperature, and the second preset temperature, the system can accurately determine the risk of condensation and automatically control the gas cylinder assembly to introduce or stop introducing dry gas. The exhaust valve then discharges humid gas, thereby effectively preventing condensation from damaging the battery pack and ensuring the safety of the battery pack. In addition, the anti-condensation process is automatically controlled by the battery control unit without manual intervention. It can adjust operations in real time according to the environmental conditions inside the battery pack, ensuring the timeliness and effectiveness of anti-condensation measures. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0040] Figure 1 A schematic diagram of the structure of a battery pack provided in one embodiment of the present application Figure 1 ;

[0041] Figure 2 A schematic diagram of the structure of a battery pack provided in one embodiment of the present application Figure 2 ;

[0042] Figure 3 A schematic diagram of the structure of a battery pack provided in one embodiment of the present application Figure 3 ;

[0043] Figure 4 A schematic diagram of the structure of a battery pack provided in one embodiment of the present application Figure 4 ;

[0044] Figure 5 A schematic diagram of the structure of an energy storage system provided in one embodiment of the present application;

[0045] Figure 6 A flowchart of a method for preventing condensation in a battery pack according to an embodiment of the present application is provided.

[0046] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0047] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0048] The terms "first," "second," "third," "fourth," and so on (if any) in the description and claims of the embodiments of the present application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein, for example, can be implemented in an order other than those illustrated or described herein.

[0049] The terms "first," "second," "third," "fourth," and so on (if any) in the description and claims of the embodiments of the present application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein, for example, can be implemented in an order other than those illustrated or described herein.

[0050] In the embodiments of the present application, words such as "exemplarily" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplarily" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or advantageous than other embodiments or designs. Specifically, the use of words such as "exemplarily" or "for example" is intended to present related concepts in a concrete manner. Unless otherwise specified, the term "plurality" means two or more.

[0051] At present, with the rapid development of new energy technologies, battery packs are widely used in electric vehicles, energy storage systems and other fields. The battery pack is assembled from multiple battery modules. During operation, the battery pack generates a large amount of heat, which will cause the temperature of the battery cells to rise, affecting the safety and service life of the battery pack. At present, the heat dissipation and cooling methods of the battery pack are mainly direct cooling and liquid cooling. When using liquid cooling or direct cooling to cool down, the supply temperature of the liquid in the liquid cooling pipe is very low, and condensation is easily generated in the liquid cooling pipe and electric cooling plate in the battery pack. Condensation will cause the electrical components inside the battery pack to become damp, thereby affecting the performance and service life of the battery. In severe cases, it may even cause safety accidents such as short circuits. At present, the anti-condensation effect of existing battery packs is not ideal, and it is difficult to effectively control the condensation situation in the battery pack.

[0052] It can be seen that condensation is caused by the presence of high-temperature, high-humidity gas inside the battery pack. When the low-temperature surface of the liquid cooling pipe comes into contact with the high-temperature, high-humidity gas, if the pipe wall temperature is lower than the air dew point, water vapor condenses into liquid. Therefore, to prevent condensation inside the battery pack, a monitoring device can be used to monitor key parameters of the gas inside the battery pack, such as temperature and humidity. The dew point temperature is then determined from the monitoring data. When the dew point temperature is close to the cold plate temperature, condensation is about to occur. In this case, dry air can be introduced into the battery pack to dilute the internal moist air, directly reducing the absolute humidity of the environment. The pressure difference then drives the moist air out of the exhaust valve, forming a directional airflow, preventing moisture from being trapped inside the battery pack and thus avoiding condensation inside the battery pack.

[0053] The following specific embodiments describe in detail the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0054] Figure 1 A schematic diagram of the structure of a battery pack provided in one embodiment of the present application Figure 1 ,like Figure 1 As shown in the figure, the battery pack 10 provided in the embodiment of the present application includes: a gas cylinder assembly 11, a sensor assembly 12, a battery control unit 13 and an exhaust valve 14. The gas cylinder assembly 11 and the sensor assembly 12 are both communicatively connected to the battery control unit 13; the exhaust valve 14 is installed on the side wall of the battery pack, and the exhaust valve 14 is used to discharge the internal gas of the battery pack into the external environment.

[0055] The gas cylinder assembly 11 is used to store compressed dry gas and, under the control of the battery control unit 13, introduces dry gas into the battery pack. The gas cylinder assembly 11 stores dry, clean dry gas, such as dry air or nitrogen. Optionally, the gas cylinder assembly 11 can be located inside or outside the battery pack. In this embodiment, the installation location of the gas cylinder assembly 11 is not specifically limited and can be selected based on actual application requirements.

[0056] Among them, the sensor component 12 is responsible for detecting important parameters in the battery pack, such as temperature and humidity, and transmitting the monitoring data to the battery control unit 13. By collecting the monitoring data, it provides a basic basis for the subsequent determination of the dew point temperature. Optionally, the sensor component 12 can have multiple configuration combinations. For example, the sensor component 12 can be a combination of a temperature sensor and a humidity sensor. The sensor component 12 can also be a combination of a temperature sensor, a humidity sensor, a pressure sensor, and a condensation sensor. Specifically, in this embodiment, the specific composition of the sensor component 12 is not limited and can be set according to actual needs.

[0057] Among them, the exhaust valve 14 is installed on the side wall of the battery pack. The main function of the exhaust valve 14 is to discharge the original dry gas inside the battery pack in time when the gas cylinder assembly 11 introduces dry gas into the battery pack, to ensure the effective renewal and circulation of the gas inside the battery pack, thereby maintaining the stability of the internal environment of the battery pack. Optionally, the exhaust valve 14 can be an electromagnetic exhaust valve 14, and the electromagnetic exhaust valve 14 can be communicated with the battery control unit 13, and the electromagnetic exhaust valve 14 can be selectively opened or closed by the battery control unit 13. Optionally, the exhaust valve 14 can also be a one-way explosion-proof valve. When the gas pressure in the battery pack is greater than the set pressure of the one-way explosion-proof valve, the one-way explosion-proof valve opens under the action of the air pressure difference, and the gas is discharged to the outside of the battery pack. Specifically, in this embodiment, the type of exhaust valve 14 is not limited, and can be selected according to actual needs.

[0058] Among them, the battery control unit 13 is the core control unit of the battery pack, and is responsible for data processing and control.

[0059] Specifically, the battery control unit 13 is used to: obtain monitoring data inside the battery pack detected by the sensor assembly 12, and determine the dew point temperature inside the battery pack based on the monitoring data; when the dew point temperature is greater than a first preset temperature, control the gas cylinder assembly 11 to pass dry gas into the battery pack, and the dry gas in the battery pack is discharged to the outside of the battery pack through the exhaust valve 14; when the dew point temperature is less than a second preset temperature, control the gas cylinder assembly 11 to stop passing dry gas into the battery pack.

[0060] Among them, the dew point temperature is the key data for determining whether condensation will occur. The dew point temperature reflects the temperature at which water vapor in the air begins to condense into dewdrops under the current temperature and humidity conditions.

[0061] The first preset temperature is a pre-set value used to determine whether to introduce dry air into the battery pack. When the dew point temperature inside the battery pack is greater than the first preset temperature, there is a risk of condensation. The second preset temperature is a pre-set temperature value. When the dew point temperature inside the battery pack is less than the second preset temperature, it indicates that condensation will not occur in the current battery pack.

[0062] Specifically, when the battery control unit 13 determines that the dew point temperature is greater than the first preset temperature, it indicates that there is a high risk of condensation in the internal environment of the battery pack. At this time, the battery control unit 13 will issue a control instruction to control the gas cylinder assembly 11 to pass dry gas into the battery pack. After the dry gas is introduced into the battery pack, on the one hand, it can increase the gas flow inside the battery pack, improve the heat dissipation efficiency, and reduce the local temperature difference inside the battery pack; on the other hand, the addition of dry gas will dilute the original humid air inside the battery pack, thereby reducing the humidity of the air and effectively avoiding the occurrence of condensation. At the same time, the original gas in the battery pack will be discharged to the outside of the battery pack through the exhaust valve 14 installed on the side wall under the promotion of the dry gas, forming a gas cycle renewal.

[0063] Specifically, when the battery control unit 13 determines that the dew point temperature is less than the second preset temperature, indicating that the risk of condensation inside the battery pack is low, the battery control unit 13 will issue a stop command to control the gas cylinder assembly 11 to stop supplying dry gas into the battery pack, thereby avoiding unnecessary energy consumption and gas waste.

[0064] There are various optional methods for determining the dew point temperature based on the monitoring data. For example, the dew point temperature can be calculated based on the temperature, humidity, and pressure data within the battery pack using a preset dew point temperature calculation formula. Alternatively, the dew point temperature can be determined based on the temperature, humidity, and pressure data using a preset dew point temperature mapping table. Specifically, in this embodiment, there is no specific limitation on how to determine the dew point temperature, and a flexible method can be selected based on actual application requirements.

[0065] The battery pack 10 provided in the embodiment of the present application determines the dew point temperature within the battery pack through monitoring data from the sensor assembly 12. Based on the dew point temperature, the first preset temperature, and the second preset temperature, it can accurately determine the risk of condensation and automatically control the gas cylinder assembly 11 to either allow or stop the flow of dry gas, and then exhaust the moist gas through the exhaust valve 14, effectively preventing condensation from damaging the battery pack and ensuring the safety of the battery pack. Furthermore, the anti-condensation process is automatically controlled by the battery control unit 13, requiring no human intervention. It can adjust its operation in real time based on the environmental conditions within the battery pack, ensuring the timeliness and effectiveness of anti-condensation measures.

[0066] Figure 2 A schematic diagram of the structure of a battery pack provided in one embodiment of the present application Figure 2 As an optional embodiment, based on any one of the above embodiments, the sensor assembly 12 is provided in the battery pack, reference Figure 2 As shown in FIG, the sensor assembly 12 specifically includes a temperature sensor 121 , a humidity sensor 122 and a pressure sensor 123 .

[0067] Specifically, in this embodiment, the sensor assembly 12 is disposed inside the battery pack, and the sensor assembly 12 specifically includes a temperature sensor 121 , a humidity sensor 122 , and a pressure sensor 123 .

[0068] The temperature sensor 121 is used to monitor the temperature data inside the battery pack and provide key temperature data for the subsequent calculation of the dew point temperature.

[0069] Among them, the humidity sensor 122 is used to monitor the humidity level of the air inside the battery pack. Humidity is one of the important factors affecting the formation of condensation. The humidity condition inside the battery pack can be obtained through the humidity sensor 122, providing key humidity data for the subsequent calculation of the dew point temperature.

[0070] Among them, the pressure sensor 123 is used to monitor the pressure changes inside the battery pack. The pressure inside the battery pack may be affected by factors such as temperature and gas flow. The data provided by the pressure sensor 123 helps to more comprehensively evaluate the environmental conditions inside the battery pack and improve the accuracy of dew point temperature calculation.

[0071] It should be noted that the condensation temperature of water vapor in the gas varies under different pressure conditions, and changes in pressure directly affect the calculated dew point temperature. Therefore, in this embodiment, considering the effect of pressure on the dew point temperature, the calculated result is more accurate than calculating the dew point temperature based solely on temperature and humidity.

[0072] Specifically, the temperature sensor 121, the humidity sensor 122 and the pressure sensor 123 transmit the respective monitored data to the battery control unit 13, so as to provide the battery control unit 13 with comprehensive and accurate monitoring data.

[0073] Specifically, when determining the dew point temperature in the battery pack based on the monitoring data, the battery control unit 13 is specifically configured to: acquire a temperature value detected by the temperature sensor 121, a humidity value detected by the humidity sensor 122 and a pressure value detected by the pressure sensor 123; and determine the dew point temperature in the battery pack based on the temperature value, the humidity value and the pressure value.

[0074] Optionally, the battery control unit 13 can calculate the dew point temperature by using the following formula:

[0075] T1 = W - (100 - RH) / 5

[0076] wherein T1 is the dew point temperature, W is the temperature value detected by the temperature sensor 121, and RH is the relative humidity value detected by the humidity sensor 122. Further, the above calculation result is corrected according to the pressure value detected by the pressure sensor 123, so as to obtain a more accurate dew point temperature value. The correction formula can be:

[0077] T2 = T1 + k * (P - P0)

[0078] wherein T2 is the corrected dew point temperature, k is a pressure correction coefficient, P is the pressure value detected by the pressure sensor 123, and P0 is a standard atmospheric pressure.

[0079] The battery pack 10 provided by the embodiment of the present application can determine the dew point temperature based on temperature data, humidity data and pressure data, so as to more accurately reflect the condensation risk in the battery pack, thereby enabling the battery control unit 13 to more accurately control the working state of the gas cylinder assembly 11 and the exhaust valve 14, and ensuring the condensation prevention effect and reliability of the battery pack 10.

[0080] As an optional implementation, on the basis of any one of the above embodiments, when determining the dew point temperature in the battery pack based on the temperature value, the humidity value and the pressure value, the battery control unit 13 is specifically configured to:

[0081] query the preset condensation table according to the temperature value, the humidity value and the pressure value, to obtain the dew point temperature in the battery pack; wherein the preset condensation table comprises a mapping relationship between temperature, humidity, pressure and dew point temperature.

[0082] Specifically, the battery control unit 13 pre-stores the preset condensation table, which is a mapping relationship table between temperature, humidity, pressure and dew point temperature, and is constructed through a large amount of experimental data and theoretical analysis.

[0083] Specifically, after the battery control unit 13 obtains the temperature value detected by the temperature sensor 121, the humidity value detected by the humidity sensor 122, and the pressure value detected by the pressure sensor 123, the battery control unit 13 performs a query operation in a preset condensation table based on the obtained data. Because the preset condensation table stores the dew point temperatures corresponding to various temperature, humidity, and pressure combinations, the dew point temperature corresponding to the current environmental parameters within the battery pack can be quickly obtained.

[0084] For example, when the temperature sensor 121 detects that the temperature inside the battery pack is 28°C, the humidity sensor 122 detects that the relative humidity is 75%, and the pressure sensor 123 detects that the pressure is 101.3 kPa, the battery control unit 13 combines the temperature data, humidity data, and pressure data into a data group, searches the preset condensation table, and finds that the corresponding dew point temperature is 22°C.

[0085] Optionally, in actual applications, the preset condensation table can be adjusted accordingly according to the characteristics of different battery packs, usage environment and other factors, so that the preset condensation table is more suitable for specific usage scenarios and the adaptability and reliability of the battery pack are improved.

[0086] The battery pack 10 provided in the embodiment of the present application queries the dew point temperature through a preset condensation table. Compared with formula calculation, this can reduce the computing load of the battery control unit 13, improve data processing efficiency, and respond to the condensation risk in the battery pack more quickly.

[0087] Figure 3 A schematic diagram of the structure of a battery pack provided in one embodiment of the present application Figure 3 As an optional embodiment, based on any of the above embodiments, the gas cylinder assembly 11 is disposed inside the battery pack, reference Figure 3 As shown in , the gas cylinder assembly 11 specifically includes a gas cylinder 111 and a solenoid valve 112 .

[0088] Specifically, in this embodiment, the gas cylinder assembly 11 is disposed inside the battery pack, and the gas cylinder assembly 11 is composed of a gas cylinder 111 and a solenoid valve 112 .

[0089] Gas cylinder 111 is used to store dry gas required to prevent condensation, such as inert dry gases like dry nitrogen and argon. Dry nitrogen and argon have excellent dryness and chemical stability, effectively reducing humidity within the battery pack and inhibiting condensation. Furthermore, inert dry gas can also be used for fire extinguishing. Optionally, the capacity of gas cylinder 111 can be adjusted to accommodate battery packs of different sizes and types.

[0090] The solenoid valve 112, which controls the flow of dry gas, is in communication with the battery control unit 13 and can be rapidly opened or closed under the control of the battery control unit 13, thereby precisely controlling the discharge of dry gas from the gas cylinder 111. Optionally, the opening of the solenoid valve 112 can be adjusted to adjust the rate of discharge of the inert dry gas from the gas cylinder 111, thereby accurately controlling the moisture content and, consequently, the dew point temperature within the battery pack.

[0091] Specifically, the battery control unit 13 controls the gas cylinder assembly 11 to introduce dry gas into the battery pack when the dew point temperature is greater than the first preset temperature. Specifically, it is used to: when the dew point temperature is greater than the first preset temperature, control the solenoid valve 112 to open, and the gas cylinder 111 to discharge dry gas into the battery pack.

[0092] Specifically, when the battery control unit 13 determines, based on the monitoring data from the sensor assembly 12, that the dew point temperature within the battery pack is greater than a first preset temperature, i.e., when it determines that there is a high risk of condensation within the battery pack, it sends an opening command to the solenoid valve 112. Upon receiving the opening command, the solenoid valve 112 opens, allowing the dry gas stored in the gas cylinder 111 to be discharged into the battery pack under pressure. After entering the battery pack, the dry gas in the gas cylinder 111 mixes with the existing moist gas inside the battery pack and is then pushed through the exhaust valve 14 to be discharged to the external environment, thereby reducing the humidity of the gas inside the battery pack and effectively preventing the occurrence of condensation.

[0093] Specifically, the battery control unit 13 controls the gas cylinder assembly 11 to stop introducing dry gas into the battery pack when the dew point temperature is lower than the second preset temperature. Specifically, it is used to: when the dew point temperature is lower than the second preset temperature, control the solenoid valve 112 to close, and the gas cylinder 111 stops discharging dry gas into the battery pack.

[0094] Specifically, when the battery control unit 13 determines that the dew point temperature is less than the second preset temperature, indicating that the risk of condensation in the battery pack is low, the battery control unit 13 sends a close command to the solenoid valve 112. Upon receiving the command, the solenoid valve 112 promptly closes, thereby cutting off the gas passage between the gas cylinder 111 and the interior of the battery pack. The gas cylinder 111 stops discharging dry gas into the battery pack, thus avoiding unnecessary consumption of dry gas.

[0095] The battery pack 10 provided in the embodiment of the present application has a gas cylinder assembly 11 disposed inside the battery pack, and the dry gas in the gas cylinder 111 is controlled to be on and off by the solenoid valve 112, thereby ensuring that when condensation risk occurs in the battery pack, the discharge of the dry gas is controlled in a timely and accurate manner, thereby improving the anti-condensation efficiency and effectively ensuring the safe operation of the battery pack.

[0096] As an optional implementation, based on any of the above embodiments, refer to Figure 1 As shown in FIG, the sensor assembly 12 includes a pressure sensor; the exhaust valve 14 is an electromagnetic exhaust valve, and the electromagnetic exhaust valve is communicatively connected to the battery control unit 13.

[0097] Specifically, in this embodiment, the sensor assembly 12 includes a pressure sensor, which is used to monitor the air pressure changes in the battery pack in real time and provide pressure data to the battery control unit 13.

[0098] Specifically, in this embodiment, the exhaust valve 14 is a solenoid exhaust valve, which is in communication with the battery control unit 13. The solenoid exhaust valve is a controllable channel for gas exchange inside and outside the battery pack and can be quickly opened or closed according to the instructions of the battery control unit 13.

[0099] Specifically, the battery control unit 13 is further configured to: obtain a battery pack pressure value detected by a pressure sensor; and control the electromagnetic exhaust valve to open when the battery pack pressure value is greater than a first preset pressure value.

[0100] The first preset pressure value is a pre-set pressure value used to determine whether the electromagnetic exhaust valve needs to be opened for exhaust. Optionally, the first preset pressure value can be a standard atmospheric pressure, or can be set to other values ​​according to actual needs. This embodiment does not specifically limit its value.

[0101] It can be seen that during normal operation, the internal pressure of the battery pack will remain within a relatively stable range. However, the pressure may fluctuate when dry gas is introduced or the ambient temperature changes. Therefore, the battery control unit 13 obtains the battery pack pressure value detected by the pressure sensor. When the battery control unit 13 determines that the battery pack pressure value is greater than a first preset pressure value, indicating that the pressure inside the battery pack is too high or greater than the external ambient pressure, the battery control unit 13 controls the electromagnetic exhaust valve to open, allowing some of the gas inside the battery pack to be discharged to the external environment through the exhaust valve, thereby reducing the pressure inside the battery pack and also reducing the humidity of the gas inside the battery pack.

[0102] For example, when the gas cylinder assembly 11 introduces dry gas into the battery pack, the pressure inside the battery pack gradually increases. When the pressure sensor detects that the pressure exceeds a first preset pressure value, for example, 105 kPa, the battery control unit 13 issues an opening command to the solenoid exhaust valve, which opens to release some of the dry gas. When the pressure drops to a safe range or the risk of condensation in the battery pack decreases, the battery control unit 13 controls the solenoid exhaust valve to close.

[0103] The battery pack 10 provided in the embodiment of the present application monitors the pressure inside the battery pack through a pressure sensor and exhausts the gas when the pressure exceeds a first preset pressure value, thereby preventing the battery pack from being deformed, damaged or even exploding due to excessive internal pressure, thereby improving the safety of the battery pack.

[0104] As an optional implementation manner, based on any of the above embodiments, the battery control unit 13 is further configured to:

[0105] When the battery pack pressure value is less than the second preset pressure value, the gas cylinder assembly 11 is controlled to discharge dry gas into the battery pack; when the battery pack pressure value is greater than the third preset pressure value, the gas cylinder assembly 11 is controlled to stop discharging dry gas into the battery pack; wherein the first preset pressure value is greater than the third preset pressure value, and the third preset pressure value is greater than the second preset pressure value.

[0106] Specifically, in this embodiment, the battery control unit 13 achieves precise control over the discharge of dry gas from the gas cylinder assembly 11 by presetting different pressure thresholds, thereby ensuring that the internal pressure of the battery pack is within a reasonable range.

[0107] Furthermore, the battery control unit 13 obtains the battery pack pressure value detected by the pressure sensor, compares the battery pack pressure value with a preset pressure threshold, and then sends a corresponding control instruction according to the comparison result.

[0108] Specifically, when the battery pack pressure value is less than the second preset pressure value, it means that the internal pressure of the battery pack is too low, which may cause external moist air to flow back into the battery pack, increasing the risk of condensation inside the battery pack and potentially affecting the normal operation of the battery. At this time, the battery control unit 13 controls the gas cylinder assembly 11 to discharge dry gas into the battery pack. After the solenoid valve 112 is opened, the dry gas stored in the gas cylinder 111 flows into the battery pack, increasing the internal pressure of the battery pack, thereby ensuring pressure balance between the internal and external environment.

[0109] Furthermore, when the battery control unit 13 detects that the battery pack pressure value is greater than a third preset pressure value, indicating that the internal pressure of the battery pack has returned to a reasonable range, the battery control unit 13 controls the gas cylinder assembly 11 to stop discharging dry gas into the battery pack to prevent risks associated with further pressure increases, such as deformation of the battery pack housing due to excessive pressure or damage to internal electrical components.

[0110] Specifically, in this embodiment, the first preset pressure value is greater than the third preset pressure value, and the third preset pressure value is greater than the second preset pressure value. The first preset pressure value is used to trigger the opening of the electromagnetic exhaust valve 14 to discharge some of the gas within the battery pack, thereby reducing the pressure inside the battery pack; the second preset pressure value is used to trigger the gas cylinder assembly 11 to exhaust gas into the battery pack to prevent the pressure inside the battery pack from being too low; and the third preset pressure value is used to trigger the gas cylinder assembly 11 to stop exhausting gas into the battery pack to ensure that the pressure inside the battery pack is within a reasonable range.

[0111] The battery pack 10 provided in the embodiment of the present application can ensure that the pressure value inside the battery pack is within a safe range by setting the second preset pressure value and the third preset pressure value, thereby effectively preventing the battery pack from being affected by abnormal pressure on battery performance and safety.

[0112] As an optional implementation, based on any of the above embodiments, the exhaust valve 14 is an explosion-proof one-way valve; when the pressure value inside the battery pack is greater than the external environmental pressure value, the explosion-proof one-way valve opens and the gas in the battery pack is discharged to the outside of the battery pack.

[0113] Specifically, in this embodiment, the exhaust valve 14 is an explosion-proof one-way valve. The structural feature of the explosion-proof one-way valve is that it only allows gas to flow in one direction from the inside of the battery pack to the external environment, and has an explosion-proof function.

[0114] Furthermore, when the pressure inside the battery pack rises to a level exceeding the external ambient pressure due to factors such as the introduction of dry gas or temperature changes, the valve flap or diaphragm inside the explosion-proof one-way valve is pushed open by the pressure differential, forming an exhaust channel through which the gas inside the battery pack is discharged to the outside environment. When the pressure inside the battery pack is less than or equal to the external ambient pressure, the valve flap or diaphragm returns to its original position due to its own elastic force or gravity, closing the exhaust channel and preventing moist air from flowing back into the battery pack. Thus, the explosion-proof one-way valve can promptly release pressure when the internal pressure of the battery pack rises, preventing the risk of explosion caused by excessive pressure and ensuring the safety of the battery pack.

[0115] Explosion-proof check valves can be spring-loaded, gravity-operated, or diaphragm-type. The specific type of explosion-proof check valve can be selected based on factors such as the battery pack's operating pressure range, exhaust flow requirements, and the operating environment. For example, for common battery packs, a spring-loaded explosion-proof check valve can be used, precisely controlling the valve opening pressure by adjusting the spring preload. For applications with limited space, a compact diaphragm-type explosion-proof check valve can be selected.

[0116] It should be noted that the structure of the explosion-proof one-way valve is relatively simple and does not contain complex electronic components, which reduces the possibility of valve failure due to electrical failure.

[0117] In the battery pack 10 provided in the embodiment of the present application, the exhaust valve 14 is an explosion-proof one-way valve, which has a simple structure and low cost.

[0118] Figure 4 A schematic diagram of the structure of a battery pack provided in one embodiment of the present application Figure 4 As an optional implementation, based on any of the above embodiments, refer to Figure 4 As shown in , the sensor assembly 12 further includes: a condensation sensor 15, which is arranged inside the battery pack.

[0119] Specifically, the condensation sensor 15 detects condensation inside the battery pack by sensing whether water droplets have condensed on the inner surface of the battery pack or in a specific detection area, converting the detection result into an electrical signal or other identifiable signal, and transmitting it to the battery control unit 13.

[0120] Specifically, the battery control unit 13 is also used to: obtain the condensation state in the battery pack detected by the condensation sensor 15; when the condensation state indicates that condensation exists, control the gas cylinder assembly 11 to introduce dry gas into the battery pack, and the gas in the battery pack is discharged to the outside of the battery pack through the exhaust valve 14.

[0121] Specifically, when the condensation sensor 15 detects condensation, it indicates condensation within the battery pack, potentially affecting battery performance and safety. At this point, the battery control unit 13 controls the gas cylinder assembly 11 to introduce dry gas into the battery pack. The dry gas mixes with moist air and pushes the moist air out through the exhaust valve 14. As dry gas continues to flow in and moist air is expelled, the humidity within the battery pack gradually decreases, eliminating condensation.

[0122] Specifically, the condensation sensor 15 can directly detect whether condensation has occurred inside the battery pack and initiate anti-condensation measures upon confirmation of condensation, effectively reducing the duration of condensation damage to the electrical components within the battery pack. It should be noted that when a fault or error in the dew point temperature is determined based on monitoring data, the detection result of the condensation sensor 15 can serve as a reliable basis for determining the presence of condensation, thereby improving the reliability of the battery pack 10. If the condensation sensor 15 detects the absence of condensation, the operating state of the battery control unit 13 remains unchanged.

[0123] The battery pack 10 provided in the embodiment of the present application is configured to detect whether condensation exists inside the battery pack by providing a condensation sensor 15. When the condensation sensor 15 detects the presence of condensation, the gas cylinder assembly 11 is controlled to exhaust gas, thereby reducing the humidity inside the battery pack and eliminating the condensation inside the battery pack.

[0124] As an optional implementation manner, based on any of the above embodiments, the method further includes:

[0125] The air duct and fan are both arranged inside the battery pack. The fan is arranged corresponding to the position of the exhaust valve 14. One end of the air duct is arranged corresponding to the exhaust port of the gas cylinder assembly 11, and the other end is connected to the fan; the fan is communicated with the battery control unit 13.

[0126] The fan is located at the exhaust valve 14 and is used to accelerate the exhaust of gas from the battery pack. The fan is in communication with the battery control unit 13 and operates under the instructions of the battery control unit 13. One end of the air duct is located at the exhaust port of the gas cylinder assembly 11, and the other end is connected to the fan, thus forming a gas channel.

[0127] Optionally, there are multiple options for the shape of the air duct, such as a serpentine shape, an arc shape, an L shape, etc. The specific shape of the air duct can be flexibly selected according to actual needs.

[0128] Specifically, the battery control unit 13 , after controlling the gas cylinder assembly 11 to introduce dry gas into the battery pack, is also used to control the fan to turn on.

[0129] Specifically, when the gas cylinder assembly 11 introduces dry gas into the battery pack, the fan begins to operate. The fan allows the dry gas discharged from the gas cylinder assembly 11 through the air duct to flow more rapidly within the battery pack, thereby thoroughly mixing with the existing moist gas within the battery pack. Simultaneously, the airflow generated by the fan accelerates the flow of the mixed gas toward the exhaust valve 14, allowing the moist gas within the battery pack to be discharged more quickly through the exhaust valve 14 to the external environment.

[0130] The battery pack 10 provided in the embodiment of the present application has an air duct and a fan arranged inside the battery pack 10. The air duct can guide the gas flow, so that the dry gas discharged from the gas cylinder assembly 11 reaches various areas in the battery pack more accurately and efficiently, avoiding disorderly diffusion of the dry gas in the battery pack, ensuring that the moist gas in the battery pack can be fully replaced, and improving the efficiency and effect of anti-condensation; the fan accelerates the flow of dry gas, shortens the gas replacement time, can reduce the humidity in the battery pack more quickly, and can quickly eliminate the condensation risk when there is a risk of condensation or condensation has already occurred in the battery pack.

[0131] Figure 5 A schematic diagram of the structure of an energy storage system provided in one embodiment of the present application; Figure 5 As shown in , the energy storage system 20 provided in an embodiment of the present application includes: a plurality of battery packs 10 provided in any of the above embodiments. Specifically, the battery pack 10 is an energy supply unit of the energy storage system.

[0132] Figure 6 A flowchart of a method for preventing condensation of a battery pack according to an embodiment of the present application is shown in FIG. Figure 6 As shown, the execution subject of the battery pack anti-condensation method in this embodiment is the battery control unit. The battery pack anti-condensation method provided in this embodiment specifically includes the following steps:

[0133] S401 : Acquire monitoring data inside the battery pack detected by a sensor assembly, and determine the dew point temperature inside the battery pack based on the monitoring data.

[0134] S402: When the dew point temperature is greater than a first preset temperature, control the gas cylinder assembly to introduce dry gas into the battery pack, and the gas in the battery pack is discharged to the outside of the battery pack through the exhaust valve.

[0135] S403: When the dew point temperature is lower than a second preset temperature, control the gas cylinder assembly to stop supplying dry gas into the battery pack.

[0136] Optionally, when the dew point temperature inside the battery pack is determined based on monitoring data, the battery pack anti-condensation method includes: obtaining the temperature value detected by the temperature sensor, the humidity value detected by the humidity sensor, and the pressure value detected by the pressure sensor; and determining the dew point temperature inside the battery pack based on the temperature value, humidity value, and pressure value.

[0137] Optionally, when determining the dew point temperature inside the battery pack based on the temperature value, humidity value and pressure value, the battery pack anti-condensation method includes: querying a preset condensation table according to the temperature value, humidity value and pressure value to obtain the dew point temperature inside the battery pack; wherein the preset condensation table includes a mapping relationship between temperature, humidity and pressure and the dew point temperature.

[0138] Optionally, when the dew point temperature is greater than a first preset temperature, controlling the gas cylinder assembly to pass dry gas into the battery pack, the battery pack anti-condensation method includes: when the dew point temperature is greater than the first preset temperature, controlling the solenoid valve to open, and the gas cylinder to discharge dry gas into the battery pack;

[0139] Optionally, when the dew point temperature is lower than a second preset temperature, the gas cylinder assembly is controlled to stop supplying dry gas into the battery pack. The battery pack anti-condensation method includes: when the dew point temperature is lower than the second preset temperature, the solenoid valve is controlled to close, and the gas cylinder stops discharging dry gas into the battery pack.

[0140] Optionally, the battery pack anti-condensation method further includes: obtaining a battery pack pressure value detected by a pressure sensor; and controlling the electromagnetic exhaust valve to open when the battery pack pressure value is greater than a first preset pressure value.

[0141] Optionally, the battery pack anti-condensation method also includes: when the battery pack pressure value is less than a second preset pressure value, controlling the gas cylinder assembly to discharge dry gas into the battery pack; when the battery pack pressure value is greater than a third preset pressure value, controlling the gas cylinder assembly to stop discharging dry gas into the battery pack; wherein the first preset pressure value is greater than the third preset pressure value, and the third preset pressure value is greater than the second preset pressure value.

[0142] Optionally, the battery pack anti-condensation method also includes: obtaining the condensation state in the battery pack detected by the condensation sensor; when the condensation state indicates that condensation exists, controlling the gas cylinder assembly to introduce dry gas into the battery pack, and the gas in the battery pack is discharged to the outside of the battery pack through the exhaust valve.

[0143] Optionally, after controlling the gas cylinder assembly to pass dry gas into the battery pack, the battery pack anti-condensation method further includes: controlling the fan to turn on.

[0144] The division of units is merely a logical functional division; actual implementations may employ alternative divisions, such as combining or integrating multiple units or components into another system, or omitting or disabling certain features. Furthermore, any direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection between devices or units, either through an interface, electrical, mechanical, or other means.

[0145] Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0146] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0147] Finally, it should be noted that those skilled in the art will readily identify other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art not disclosed herein. The present invention is not limited to the precise structure described above and illustrated in the accompanying drawings, and various modifications and variations may be made without departing from the scope thereof. The scope of the present invention is limited solely by the appended claims.

Claims

1. A battery pack, characterized in that: include: A gas cylinder assembly, a sensor assembly, a battery control unit, and an exhaust valve, wherein the gas cylinder assembly and the sensor assembly are both communicatively connected to the battery control unit; The exhaust valve is installed on the side wall of the battery pack, and is used to discharge the internal gas of the battery pack into the external environment; The battery control unit is used to: Acquiring monitoring data within the battery pack detected by the sensor assembly, and determining a dew point temperature within the battery pack based on the monitoring data; When the dew point temperature is greater than a first preset temperature, controlling the gas cylinder assembly to pass dry gas into the battery pack, and exhausting the gas in the battery pack to the outside of the battery pack through the exhaust valve; When the dew point temperature is lower than a second preset temperature, the gas cylinder assembly is controlled to stop supplying dry gas into the battery pack.

2. The battery pack according to claim 1, wherein: The sensor assembly is disposed in the battery pack, and the sensor assembly includes a temperature sensor, a humidity sensor, and a pressure sensor; The battery control unit is configured to, when determining the dew point temperature in the battery pack based on the monitoring data, specifically: Acquire the temperature value detected by the temperature sensor, the humidity value detected by the humidity sensor, and the pressure value detected by the pressure sensor; A dew point temperature in the battery pack is determined based on the temperature value, the humidity value, and the pressure value.

3. The battery pack according to claim 2, wherein: The battery control unit, when determining the dew point temperature in the battery pack based on the temperature value, the humidity value, and the pressure value, is specifically configured to: The dew point temperature in the battery pack is obtained by querying a preset condensation table according to the temperature value, the humidity value, and the pressure value; wherein the preset condensation table includes a mapping relationship between temperature, humidity, and pressure and the dew point temperature.

4. The battery pack according to claim 1, wherein: The gas cylinder assembly is arranged inside the battery pack, and the gas cylinder assembly includes a gas cylinder and a solenoid valve; The battery control unit controls the gas cylinder assembly to introduce dry gas into the battery pack when the dew point temperature is greater than a first preset temperature, specifically for: When the dew point temperature is greater than a first preset temperature, the solenoid valve is controlled to open, and the gas cylinder discharges dry gas into the battery pack; The battery control unit controls the gas cylinder assembly to stop supplying dry gas into the battery pack when the dew point temperature is lower than a second preset temperature, specifically for: When the dew point temperature is lower than a second preset temperature, the solenoid valve is controlled to close, and the gas cylinder stops discharging dry gas into the battery pack.

5. The battery pack according to claim 1, wherein: The sensor assembly includes a pressure sensor; the exhaust valve is an electromagnetic exhaust valve, and the electromagnetic exhaust valve is communicatively connected to the battery control unit; The battery control unit is further used for: Obtaining a battery pack pressure value detected by the pressure sensor; When the battery pack pressure value is greater than a first preset pressure value, the electromagnetic exhaust valve is controlled to open.

6. The battery pack according to claim 5, characterized in that: The battery control unit is further used for: When the battery pack pressure value is less than a second preset pressure value, controlling the gas cylinder assembly to discharge dry gas into the battery pack; When the battery pack pressure value is greater than a third preset pressure value, the gas cylinder assembly is controlled to stop discharging dry gas into the battery pack; wherein, the first preset pressure value is greater than the third preset pressure value, and the third preset pressure value is greater than the second preset pressure value.

7. The battery pack according to claim 1, wherein: The exhaust valve is an explosion-proof one-way valve; when the pressure value inside the battery pack is greater than the external environmental pressure value, the explosion-proof one-way valve opens and the gas in the battery pack is discharged to the outside of the battery pack.

8. The battery pack according to any one of claims 1 to 7, characterized in that: The sensor assembly further includes: a condensation sensor, the condensation sensor being disposed inside the battery pack; The battery control unit is further used for: obtaining a condensation state in the battery pack detected by the condensation sensor; When the condensation state indicates that condensation exists, the gas cylinder assembly is controlled to pass dry gas into the battery pack, and the gas in the battery pack is discharged to the outside of the battery pack through the exhaust valve.

9. The battery pack according to any one of claims 1 to 7, characterized in that: Also includes: An air duct and a fan, both of which are disposed inside the battery pack, the fan being disposed correspondingly to the position of the exhaust valve, one end of the air duct being disposed correspondingly to the exhaust port of the gas cylinder assembly, and the other end being connected to the fan; the fan being communicatively connected to the battery control unit; The battery control unit, after controlling the gas cylinder assembly to pass dry gas into the battery pack, is further used to: control the fan to turn on.

10. An energy storage system, characterized in that: include: A plurality of battery packs according to any one of claims 1 to 9.

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