BMS from the board, BMS mainboard, battery pack and its temperature and humidity control method

Abstract

The application provides a BMS slave board, a BMS master board, a battery pack and a temperature and humidity control method. The BMS slave board comprises a first temperature and humidity sensing unit, which is used for collecting and storing the temperature and humidity of a predetermined area in a battery pack box; and a battery sampling chip, which is communicatively coupled with the first temperature and humidity sensing unit and is used for obtaining the temperature and humidity by accessing the first temperature and humidity sensing unit. The first temperature and humidity sensing unit and the battery sampling chip are arranged on the same circuit board, and a power supply end of the first temperature and humidity sensing unit is connected with a power output end of the battery module. In the embodiment of the application, the power supply end of the first temperature and humidity sensing unit is connected with the power output end of the battery module, so that the temperature and humidity monitoring can be continuously performed without being affected by the factor that the whole vehicle is powered off when parking, and the defect that the humidity in the battery pack cannot be monitored after the whole vehicle is powered off in the prior art is solved.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle battery technology, and in particular to BMS slave board, BMS main board, battery pack and its temperature and humidity control method. Background Technology

[0002] As a core component of electric vehicles, the power battery provides electrical energy to the drive motor of the electric vehicle.

[0003] Vehicle-mounted power batteries are typically designed with an IP67-level sealing rating and include a balancing valve to address pressure changes inside and outside the battery pack. Therefore, while the battery pack casing can prevent the intrusion of external liquid water, it cannot completely prevent water vapor from entering the pack. When water vapor accumulates to a certain level inside the battery pack, it is highly likely to condense under temperature changes, potentially causing electrical insulation failures and even safety issues. Therefore, humidity monitoring and anti-condensation measures within the battery pack are crucial aspects of electrical safety design. (Refer to...) Figure 1 The current common solution is to install an independent humidity monitoring module inside the battery pack.

[0004] In the process of developing this invention, the inventors discovered at least the following problems in the prior art: Such humidity monitoring modules typically require an independent low-voltage battery for power and are connected to the vehicle controller via CAN communication to achieve monitoring. Due to the low-voltage battery power supply issue, this module cannot perform monitoring when the vehicle is parked and powered off. Furthermore, once humidity exceeds the limit, it can only issue an alarm signal and wait for processing, without addressing the moisture problem within the battery pack. Summary of the Invention

[0005] The present invention aims to at least partially solve one of the technical problems in the related art.

[0006] Therefore, the purpose of this invention is to propose a BMS slave board, BMS main board, battery pack and its temperature and humidity control method, to solve the defects in the prior art that the humidity inside the battery pack cannot be monitored after the vehicle is powered off, and the problem that there is only an alarm signal when the humidity exceeds the standard but cannot remove condensation.

[0007] To achieve the above objectives, a first aspect of the present invention provides a BMS slave board, comprising:

[0008] The first temperature and humidity sensing unit is used to collect and store the temperature and humidity of a predetermined area inside the battery pack box;

[0009] A battery sampling chip is communicatively coupled to the first temperature and humidity sensing unit and is used to acquire temperature and humidity by accessing the first temperature and humidity sensing unit; wherein the first temperature and humidity sensing unit and the battery sampling chip are disposed on the same circuit board, and the power supply terminal of the first temperature and humidity sensing unit is connected to the power output terminal of the battery module.

[0010] In this embodiment of the invention, the BMS slave board places the first temperature and humidity sensing unit and the battery sampling chip on the same circuit board, reducing the space occupied by the independent humidity monitoring module in the battery pack in the prior art. In this embodiment of the invention, the power supply terminal of the first temperature and humidity sensing unit is connected to the power output terminal of the battery module, so that temperature and humidity monitoring can be continuously performed without being affected by the vehicle being parked and powered off.

[0011] According to one embodiment of the present invention, the first temperature and humidity sensing unit is a temperature and humidity sensor, the temperature and humidity sensor comprising:

[0012] Humidity probe;

[0013] Temperature probe;

[0014] An analog-to-digital converter is used to convert the signals acquired by the humidity probe and the temperature probe from analog to digital.

[0015] Logic control memory, used to acquire and store data after analog-to-digital conversion;

[0016] An I2C interface is used to transmit data from the logic control memory to the battery sampling chip.

[0017] According to one embodiment of the present invention, the power output terminal of the battery module is connected to the power supply terminal of the first temperature and humidity sensing unit after being regulated by a linear regulator or a DC-DC converter.

[0018] A second aspect of the present invention provides a BMS mainboard, which is disposed in the battery pack housing and is used to connect with the BMS slave board described in the first aspect above. The mainboard determines whether condensation exists in the current battery pack based on the enthalpy-humidity diagram and historical temperature and humidity data obtained from the first temperature and humidity sensing unit, or compares the current humidity value in the battery pack with a preset humidity value to determine whether condensation exists in the current battery pack.

[0019] The BMS motherboard of this invention determines whether condensation occurs inside the battery pack based on the temperature and humidity data recorded in the battery pack and the enthalpy-humidity diagram. Compared with the prior art, which only measures and displays temperature and humidity, it is more accurate in determining whether condensation occurs inside the battery pack.

[0020] According to one embodiment of the present invention, the BMS motherboard further includes a second temperature and humidity sensing unit, which is used to collect and store the temperature and humidity of a predetermined area inside the battery pack housing. The BMS motherboard is also used to compare the current humidity value inside the battery pack measured by the second temperature and humidity sensing unit with a preset humidity value to determine whether there is condensation inside the current battery pack.

[0021] According to one embodiment of the present invention, the BMS motherboard further includes an RTC unit, which is used to wake up the BMS and inspect the battery pack within a predetermined time.

[0022] According to one embodiment of the present invention, the BMS motherboard further includes a high-side and low-side output unit, which is used to provide power to the load in a high-side and / or low-side manner.

[0023] A third aspect of the present invention provides a battery pack comprising the BMS slave board described in the first aspect, the BMS main board described in the second aspect, and a dehumidification module, wherein the dehumidification module is used to perform dehumidification under the control of the BMS main board.

[0024] According to one embodiment of the present invention, the dehumidification module is an electro-dehumidification module. The power input terminal of the electro-dehumidification module is connected to the BMS mainboard. The electro-dehumidification module includes a breathable protective shell, an electrolytic electrode, and a proton exchange membrane. The electrolytic electrode and the proton exchange membrane are installed inside the breathable protective shell. The breathable protective shell is disposed through the battery pack housing. The electrolytic electrode is used to adsorb and electrolyze water molecules in the battery pack into oxygen and protons. The proton exchange membrane is used to discharge protons from the battery pack. The protons and external oxygen regenerate water molecules to achieve dehumidification.

[0025] According to one embodiment of the present invention, the dehumidification module is a moisture absorption module. The power input terminal of the moisture absorption module is connected to the BMS main board. The moisture absorption module includes a moisture absorption material pack, a heating element, and a temperature sensor. The moisture absorption material pack is used to absorb water molecules in the battery pack. The heating element is used to heat the moisture absorption material pack to regenerate the moisture absorption material. The temperature sensor is used to monitor the heating temperature of the heating element.

[0026] A fourth aspect of the present invention provides a method for controlling the temperature and humidity of a battery pack, comprising:

[0027] Temperature and humidity of a predetermined area of ​​the battery pack housing are obtained using a temperature and humidity sensor, wherein the temperature and humidity sensor is installed on the BMS slave board and the power supply terminal of the temperature and humidity sensor is connected to the power output terminal of the battery module.

[0028] The presence of condensation inside the battery pack is determined using an enthalpy-humidity chart based on temperature and humidity.

[0029] If the determination result is yes, the dehumidification module is activated to dehumidify the battery pack.

[0030] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0031] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. Wherein:

[0032] Figure 1 This is a schematic diagram of the structure of a battery pack in the prior art.

[0033] Figure 2 This is a schematic diagram of the structure of a battery pack proposed in an embodiment of the present invention.

[0034] Figure 3 This is a flowchart of a battery pack temperature and humidity control method proposed in an embodiment of the present invention.

[0035] Figure 4 This is a flowchart of a battery pack temperature and humidity control method proposed in an embodiment of the present invention.

[0036] Figure 5 This is a schematic diagram of the electro-dehumidification module of the battery pack proposed in one embodiment of the present invention.

[0037] Figure 6 It is an air enthalpy-humidity graph.

[0038] Figure 7 It is based on Figure 6 A diagram illustrating how to determine if condensation has formed inside a battery pack.

[0039] Figure 8 This is a schematic diagram of the structure of a battery pack proposed in an embodiment of the present invention.

[0040] Figure 9 This is a flowchart of a battery pack temperature and humidity control method proposed in an embodiment of the present invention.

[0041] Explanation of reference numerals in the attached figures:

[0042] 5-Humidity monitoring module; 101-Vehicle ignition switch; 102-Vehicle CAN terminal; 103-Vehicle low-voltage power supply; 201-First BMS slave board; 202-Temperature and humidity sensor; 203-Battery sampling chip; 204-I2C interface; 205-Chip power supply terminal; 206-Humidity probe; 207-Temperature probe; 208-Analog-to-digital converter; 209-Logic control memory; 210-First communication terminal; 212-Second BMS slave board; 301-Battery pack housing; 302-BMS mainboard; 303-Second battery module; 304-First battery... Pool module; 305-Balanced vent valve; 306-Maintenance window; 307-Main board CAN terminal; 308-Key signal terminal; 309-Low voltage power supply terminal; 310-Second communication terminal; 311-High and low side output unit; 312-Temperature monitoring port; 401-Electro-dehumidification module; 402-Power module; 403-Electrolytic electrode; 404-Proton exchange membrane; 405-Breathable protective shell; 406-Water molecule; 407-Hydrogen ion; 408-Oxygen; 411-Moisture absorption module; 412-Moisture absorption material package; 413-Heating element; 414-Temperature sensor. Detailed Implementation

[0043] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the invention, and should not be construed as limiting the invention. Rather, embodiments of the invention include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0044] New energy vehicles are equipped with low-voltage batteries and high-voltage battery packs. The high-voltage battery pack contains several battery modules. BMS is an abbreviation for Battery Management System. As the name suggests, the battery management system is used to manage the battery so that it can maintain a better state and operate stably. Figure 1 As shown, the distributed BMS comprises one BMS mainboard and several BMS slave boards in hardware. The BMS slave boards are distributed throughout the battery pack. Existing BMS humidity monitoring modules operate at low voltage, drawing power from the vehicle's low-voltage battery. Therefore, when the vehicle is parked and power is lost, the humidity monitoring module cannot be powered on, and humidity monitoring within the battery pack cannot continue. To solve or partially solve the technical problem of unmonitored humidity in the battery pack after a vehicle power outage, embodiments of this application provide a solution, the specific implementation of which can be found below.

[0045] See Figure 2The first aspect of the present invention provides a BMS slave board, which is a BMS slave board for... Figure 2 The first BMS slave board 201 includes a first temperature and humidity sensing unit and a battery sampling chip 203. The battery sampling chip is an AFE chip (Analog Front End). Wherein:

[0046] The first temperature and humidity sensing unit is used to collect and store the temperature and humidity of a predetermined area inside the battery pack housing 301. The predetermined area can be set according to actual needs.

[0047] The battery sampling chip 203 is communicatively coupled to the first temperature and humidity sensing unit, and is used to acquire temperature and humidity by accessing the first temperature and humidity sensing unit. The first temperature and humidity sensing unit and the battery sampling chip 203 are mounted on the same circuit board, and the power supply terminal of the first temperature and humidity sensing unit is connected to the power output terminal of the battery module. In one embodiment, the power output terminal of the battery module is connected to the power supply terminal of the first temperature and humidity sensing unit after voltage regulation by a linear regulator (LDO). The advantage of a linear regulator is that it can maintain a stable voltage output even when the input voltage or load current changes. In one embodiment, the battery sampling chip 203 integrates a linear regulator, and the battery sampling chip 203 draws power from the battery module, regulates the voltage, and then supplies power to the first temperature and humidity sensing unit, which can further reduce the space occupied. In another embodiment, the power output terminal of the battery module is connected to the power supply terminal of the first temperature and humidity sensing unit after voltage regulation by a DC-DC converter (DCDC). The advantages of a DC-DC converter are low power consumption, high efficiency, high power, support for multiple voltage conversions, and input / output isolation.

[0048] In this embodiment of the invention, the BMS slave board places the first temperature and humidity sensing unit and the battery sampling chip on the same circuit board, reducing the space occupied by the independent humidity monitoring module in the battery pack in the prior art. In this embodiment of the invention, the power supply terminal of the first temperature and humidity sensing unit is connected to the power output terminal of the battery module, so that temperature and humidity monitoring can be continuously performed without being affected by the vehicle being parked and powered off.

[0049] In one example, refer to Figure 3The first temperature and humidity sensing unit of the BMS slave board is a temperature and humidity sensor 202. The temperature and humidity sensor 202 includes an I2C interface 204, a humidity probe 206, a temperature probe 207, an analog-to-digital converter 208, and a logic control memory 209. The humidity probe 206 monitors humidity changes in the battery pack, and the temperature probe 207 monitors temperature changes in the battery pack. The analog-to-digital converter 208 converts the signals collected by the humidity probe 206 and temperature probe 207 from analog to digital. The logic control memory 209 acquires and stores the converted data. The I2C interface 204 transmits data from the logic control memory 209 to the battery sampling chip 203. The BMS slave board can be equipped with temperature and humidity sensors at specific locations within the battery pack, with humidity sensors only installed on the BMS slave board in the areas requiring monitoring to save costs.

[0050] A second aspect of the present invention provides a BMS motherboard, referring to... Figure 2 , Figure 8 The BMS mainboard 302 is located inside the battery pack housing 301 and is used to connect to the BMS slave board described in the first aspect. It determines whether condensation exists inside the battery pack based on the enthalpy-humidity diagram and historical temperature and humidity data obtained from the first temperature and humidity sensing unit. (Refer to...) Figure 6 An enthalpy-humidity chart is a graphical representation of the relationships between various parameters of humid air, reflecting its thermophysical properties and various air handling processes. It's understood that the enthalpy-humidity chart data table is stored in the BMS motherboard's memory and can be accessed by the BMS motherboard. (Refer to...) Figure 7 An enthalpy-humidity chart contains isotherms, isohumidity lines (water content), and isorelative humidity lines. The 100% isorelative humidity line is also the dew point temperature line; condensation begins at or below this line. Assuming the initial air state inside the battery pack is point A (temperature 43℃, relative humidity 15%), as the battery pack temperature decreases, since the humidity remains unchanged (the total water content in the air inside the battery pack remains constant), the air state inside the battery pack will move along the isohumidity line to point B (temperature 22℃, relative humidity 50%). If the temperature continues to decrease to point C (temperature 10℃, relative humidity 100%), condensation begins. In other words, under constant atmospheric pressure, the measured temperature and humidity data can determine the location of points on the enthalpy-humidity chart. If the point is located on or beyond the area enclosed by the dew point line and the coordinate axes, condensation is confirmed to exist inside the battery pack.

[0051] In one implementation, the BMS mainboard 302 compares the current humidity value inside the battery pack with a preset humidity value to determine whether condensation exists inside the battery pack. The preset humidity value is set based on experience. If the humidity value inside the battery pack is greater than the preset humidity value, it is determined that condensation exists inside the battery pack; otherwise, condensation does not exist.

[0052] The BMS motherboard of this invention determines whether condensation occurs inside the battery pack based on the temperature and humidity data recorded in the battery pack and the enthalpy-humidity diagram. Compared with the prior art, which only measures and displays temperature and humidity, it is more accurate in identifying condensation in the battery pack.

[0053] In one example, the BMS motherboard also includes a second temperature and humidity sensing unit, which is used to collect and store the temperature and humidity of a predetermined area inside the battery pack housing 301. The BMS motherboard 302 is also used to compare the current humidity value inside the battery pack measured by the second temperature and humidity sensing unit with a preset humidity value to determine whether there is condensation inside the current battery pack.

[0054] In one example, the BMS motherboard also includes an RTC (Real-Time Clock) unit. The RTC unit is used to wake up the BMS and check the battery pack at predetermined intervals. The predetermined time is set according to actual needs; optionally, the predetermined time is 3 hours. The RTC unit can be a separate chip; it can be understood as setting an alarm for the BMS to wake up at the set time intervals, such as every 3 hours. The RTC unit can prevent the BMS from continuously operating with power, thus saving power.

[0055] In one example, the BMS motherboard also includes a high-side and low-side output unit 311, which provides power to the load in a high-side and / or low-side manner. The high-side and low-side output unit 311 includes a high-side output terminal and a low-side output terminal. High-side driving refers to enabling the drive device by closing a switch on the power line directly before the appliance or drive device, while low-side driving refers to enabling the drive device by closing a ground wire after the appliance or drive device.

[0056] A third aspect of the present invention provides a battery pack, referring to... Figure 2 , Figure 8 The battery pack includes the BMS slave board described in the first aspect, the BMS main board described in the second aspect, and a dehumidification module. The dehumidification module is used for dehumidification under the control of the BMS main board. When the main board determines that condensation exists inside the battery pack, it can activate the dehumidification module, regardless of whether the vehicle is in the on or off state. The dehumidification module is an independent module, and its position and number can be adjusted as needed. In one embodiment, the battery pack includes a balance vent valve 305 and a maintenance window 306. The balance vent valve 305 is used to prevent changes in internal gas pressure caused by temperature rise or fall in the battery pack, which could damage the battery pack structure. The maintenance window 306 is a sealed maintenance cover that is only opened when necessary.

[0057] In one example, refer to Figure 2 , Figure 5The dehumidification module is an electric dehumidification module 401. The power input terminal of the electric dehumidification module 401 is connected to the BMS main board 302. The electric dehumidification module 401 includes a breathable protective shell 405, an electrolytic electrode 403, and a proton exchange membrane 404. The electrolytic electrode 403 and the proton exchange membrane 404 are installed inside the breathable protective shell 405, which is installed through the battery pack housing 301. The electrolytic electrode 403 is used to adsorb and electrolyze water molecules in the battery pack into oxygen and protons. The proton exchange membrane 404 is used to discharge protons from the battery pack. The protons and external oxygen regenerate water molecules to achieve dehumidification.

[0058] In one example, refer to Figure 8 The dehumidification module is a moisture absorption module 411. The power input terminal of the moisture absorption module 411 is connected to the BMS mainboard 302. The moisture absorption module 411 includes a moisture-absorbing material pack 412, a heating element 413, and a temperature sensor 414. The moisture-absorbing material pack 412 is used to absorb water molecules in the battery pack. The heating element 413 is used to heat the moisture-absorbing material pack 412 to regenerate the moisture-absorbing material. The temperature sensor 414 is used to monitor the heating temperature of the heating element 413. Optionally, the heating element is a PTC (Positive Temperature Coefficient) ceramic heating element. In the prior art, the moisture-absorbing material pack installed in the battery pack can initially keep the battery pack dry by absorbing water vapor from the air. However, when the moisture-absorbing material is saturated, it loses its humidity control function. Therefore, it can only delay but not completely solve the humidity problem in the battery pack. In this example, the use of a heating element can regenerate the moisture-absorbing material and remove condensation more thoroughly.

[0059] A fourth aspect of this invention provides a method for controlling the temperature and humidity of a battery pack, referring to... Figure 3 The implementation process of this method is as follows:

[0060] Step S102: The temperature and humidity of a predetermined area of ​​the battery pack housing 301 are obtained using a temperature and humidity sensor. The temperature and humidity sensor is installed on the BMS slave board, and the power supply terminal of the temperature and humidity sensor is connected to the power output terminal of the battery module.

[0061] In this embodiment, the number of temperature and humidity sensors can be one or more, but preferably one. A voltage regulator is provided between the temperature and humidity sensor and the battery module.

[0062] Step S104: Determine whether there is condensation inside the battery pack housing 301 based on the temperature and humidity using an enthalpy-humidity diagram.

[0063] In this embodiment, the enthalpy-humidity chart data table is recorded in the memory. The data table can be retrieved from the memory, and it can be determined whether condensation has occurred inside the battery pack box based on the given temperature and humidity.

[0064] Step S106: If the judgment result is yes, the dehumidification module is turned on to dehumidify the battery pack.

[0065] In this embodiment, the dehumidification module can be an electric dehumidification module 401 or a moisture absorption module 411. The dehumidification module can be manually activated or activated under the control of the BMS mainboard.

[0066] The following two examples illustrate the content involved in the above examples.

[0067] Example 1

[0068] like Figure 2 The diagram shows a battery pack according to Embodiment 1 of the present invention, including a first BMS slave board 201 with a temperature and humidity sensor 202, a BMS main board 302, and an electric dehumidification module 401. Compared with a conventional second BMS slave board 212, the first BMS slave board 201 integrates the temperature and humidity sensor 202. During operation, the battery sampling chip 203 draws power from the second battery module 303 and supplies power to the temperature and humidity sensor 202 through the chip power supply terminal 205. The first battery module 304 supplies power to the second BMS slave board. The BMS main board 302 has a main board CAN terminal 307, which is connected to the vehicle CAN terminal 102. The first BMS slave board 201 has a first communication terminal 210, and the BMS main board 302 has a second communication terminal 310. A communication line exists between the first communication terminal 210 and the second communication terminal 310. The BMS main board 302 has a low-voltage power supply terminal 309, which is connected to the vehicle's low-voltage power supply.

[0069] The temperature and humidity sensor 202 integrates a humidity probe 206 and a temperature probe 207. The logic control memory 209 acquires and caches the temperature and humidity probe data through the built-in analog-to-digital converter 208, and then transmits it to the battery sampling chip 203 through the I2C interface 204. After internal processing, the battery sampling chip 203 transmits the voltage, temperature and humidity data of the second battery module 303 together to the BMS motherboard 302 through the first communication terminal 210 via the internal communication harness.

[0070] Combination Figure 2 , Figure 4 The BMS motherboard 302 can determine whether the internal humidity of the battery will increase to exceed the dew point (100% humidity) due to temperature changes during the working cycle based on the battery pack's working cycle records and enthalpy-humidity chart, and start the electric dehumidification module 401 to perform dehumidification operation based on the determination result.

[0071] Combination Figure 2 , Figure 5When the dehumidification module 401 is working, the BMS motherboard 302 supplies power to the dehumidification module 401 through the high and low side output unit 311. The dehumidification module 401 can have a built-in power module 402 to keep the voltage on the electrolysis electrode 403 at a constant level. Water molecules 406 in the air inside the battery pack are adsorbed onto the electrolysis electrode 403 and catalytically electrolyzed into hydrogen ions 407 and oxygen 408. Among them, hydrogen ions 407 are transferred to the outside of the battery pack through the proton exchange membrane 404 and react with oxygen 408 in the outside air to generate water molecules 406, thereby reducing the humidity of the air inside the battery pack.

[0072] When the vehicle is powered on, the vehicle ignition switch 101 is closed and supplies power to the BMS main board 302 through the key signal terminal 308. When the vehicle is powered off, the vehicle ignition switch 101 is open and the BMS goes into sleep mode. However, it can be woken up periodically by the built-in RTC unit and obtains power from the vehicle low-voltage power supply 103 to support the BMS system monitoring and dehumidification system operation.

[0073] In this embodiment, the first BMS slave board 201 with temperature and humidity sensor 202 can be arranged according to the humidity monitoring distribution requirements within the battery pack. The remaining positions can use a second BMS slave board 212 without humidity sensors. This modular design facilitates flexible arrangement. The electric dehumidification module 401 is an independent module, and its position and quantity can be adjusted as needed.

[0074] Example 2

[0075] Embodiment 2 of the present invention is an adjustment made based on Embodiment 1. Embodiment 2 of the present invention has the same humidity monitoring function as Embodiment 1, the difference being: Figure 8 As shown, in Embodiment 2, the electro-dehumidification module 401 in Embodiment 1 is replaced with a moisture-absorbing module 411. The moisture-absorbing module 411 contains a moisture-absorbing material pack 412, a heating element 413, and a temperature sensor 414. The BMS mainboard 302 has a temperature monitoring port 312, which is connected to the temperature sensor 414. After the battery pack is assembled, the moisture-absorbing material pack 412 begins to absorb moisture from the air inside the battery pack, ensuring that the humidity inside the battery pack remains within a reasonable range.

[0076] Combination Figure 8 , Figure 9When the moisture-absorbing material approaches saturation, the average humidity level inside the battery pack gradually increases. At this point, the BMS mainboard 302 detects the humidity change trend and the impending risk of condensation, and immediately issues a warning signal through the vehicle's CAN bus 102, triggering manual maintenance. During manual maintenance, dry air is introduced through the maintenance window 306 to replace the high-humidity air inside the battery pack. Simultaneously, the BMS mainboard 302 supplies power to the heating element 413 through the high and low side output units 311. Heating causes the moisture-absorbing material pack 412 to remove absorbed moisture, regenerating the moisture absorption function. At the same time, the BMS mainboard 302 monitors the temperature of the heating element 413 through the temperature sensor 414 to prevent overheating.

[0077] It should be noted that in the description of this invention, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0078] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0079] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0080] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of the invention includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as will be understood by those skilled in the art to which embodiments of the invention pertain.

[0081] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0082] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A battery pack for monitoring humidity inside the battery pack after the vehicle is powered off, characterized in that, include; The BMS slave board includes: a first temperature and humidity sensing unit for collecting and storing temperature and humidity in a predetermined area within the battery pack housing (301); and a battery sampling chip (203) communicatively coupled to the first temperature and humidity sensing unit for obtaining temperature and humidity by accessing the first temperature and humidity sensing unit. The first temperature and humidity sensing unit and the battery sampling chip (203) are mounted on the same circuit board. The power supply terminal of the first temperature and humidity sensing unit is connected to the power output terminal of the battery module. During operation, the battery sampling chip (203) draws power from the battery module and supplies power to the first temperature and humidity sensing unit through the chip power supply terminal (205). BMS mainboard (302) is disposed inside the battery pack housing (301) and is used to connect with the BMS slave board to determine whether there is condensation in the current battery pack; A dehumidification module, which is used to perform dehumidification under the control of the BMS mainboard.

2. The battery pack according to claim 1, characterized in that, The first temperature and humidity sensing unit is a temperature and humidity sensor (202), and the temperature and humidity sensor (202) includes: Humidity probe (206); Temperature probe (207); An analog-to-digital converter (208) is used to convert the signals acquired by the humidity probe (206) and the temperature probe (207) into analog and digital signals. A logic control memory (209) is used to acquire and store the data after analog-to-digital conversion. An I2C interface (204) is used to transmit data from the logic control memory (209) to the battery sampling chip (203).

3. The battery pack according to claim 1, characterized in that, The power output terminal of the battery module is connected to the power supply terminal of the first temperature and humidity sensing unit after being regulated by a linear regulator or a DC-DC converter.

4. The battery pack according to claim 1, characterized in that, It also includes a second temperature and humidity sensing unit, which is used to collect and store the temperature and humidity of a predetermined area inside the battery pack housing (301). The BMS motherboard (302) is also used to compare the current humidity value inside the battery pack measured by the second temperature and humidity sensing unit with a preset humidity value to determine whether there is condensation inside the current battery pack.

5. The battery pack according to claim 1, characterized in that, It also includes an RTC unit, which is used to wake up the BMS and inspect the battery pack within a predetermined time.

6. The battery pack according to claim 1, characterized in that, It also includes a high-side and low-side output unit (311) for supplying power to the load in a high-side and / or low-side manner.

7. The battery pack according to claim 1, characterized in that, The dehumidification module is an electric dehumidification module (401). The power input terminal of the electric dehumidification module (401) is connected to the BMS motherboard (302). The electric dehumidification module (401) includes a breathable protective shell (405), an electrolytic electrode (403), and a proton exchange membrane (404). The electrolytic electrode (403) and the proton exchange membrane (404) are installed inside the breathable protective shell (405). The breathable protective shell (405) is set on the battery pack housing (301). The electrolytic electrode (403) is used to adsorb and electrolyze water molecules in the battery pack into oxygen and protons. The proton exchange membrane (404) is used to discharge protons from the battery pack. The protons and external oxygen regenerate water molecules to achieve dehumidification.

8. The battery pack according to claim 1, characterized in that, The dehumidification module is a moisture absorption module (411). The power input terminal of the moisture absorption module (411) is connected to the BMS motherboard (302). The moisture absorption module (411) includes a moisture absorption material pack (412), a heating element (413), and a temperature sensor (414). The moisture absorption material pack (412) is used to absorb water molecules in the battery pack. The heating element (413) is used to heat the moisture absorption material pack (412) to regenerate the moisture absorption material. The temperature sensor (414) is used to monitor the heating temperature of the heating element (413).

9. A method for controlling the temperature and humidity of a battery pack, characterized in that, Applied to a battery pack as described in any one of claims 1 to 8, the method comprises: The temperature and humidity of a predetermined area of ​​the battery pack housing (301) are obtained using a temperature and humidity sensor, wherein the temperature and humidity sensor is installed on the BMS slave board and the power supply terminal of the temperature and humidity sensor is connected to the power output terminal of the battery module. The presence of condensation inside the battery pack is determined using an enthalpy-humidity chart based on temperature and humidity. If the determination result is yes, the dehumidification module is activated to dehumidify the battery pack.

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