Urban rail vehicle battery box active ventilation system and control method

Abstract

The application discloses a kind of urban rail vehicle battery box active ventilation system and control method, the ventilation system includes the real-time detection N ventilation amount detection module of N ventilation hole ventilation amount;N The signal of ventilation amount value sent by the control unit of N ventilation amount detection module is received;Through the ventilation amount calculation of unit time that is preset in control unit, the control unit is based on ventilation amount value and uses active ventilation control method to judge whether it needs to carry out active ventilation, when needing main control ventilation, sends control signal;Receive the control signal sent by the control unit, and the execution module installed in the front end of the battery box ventilation pipeline, the execution module executes opening air path command;With The execution module is connected, provides air source for battery internal air convection, and the air source module of battery internal ventilation;Real-time detection battery box ventilation state, solve the disadvantages that existing battery box cannot detect ventilation state and cannot actively ventilate.

Description

Technical Field

[0001] This invention belongs to the field of fully automated products and relates to an active ventilation system and control method for a battery box of urban rail vehicles. Background Technology

[0002] Currently, the alkaline nickel-cadmium batteries used in urban rail vehicles release hydrogen gas during the charging process. Because the batteries are housed in ventilated battery boxes, hydrogen gas can be expelled promptly in well-ventilated environments. However, when the vehicle is stationary and the space around the battery box is relatively enclosed, ventilation deteriorates, and the hydrogen gas cannot escape in time. When the hydrogen concentration reaches a certain level, any arc or spark could directly ignite the battery box, causing a serious hazard.

[0003] Currently, similar explosions have occurred in subway cars in some Chinese cities. Therefore, how to effectively monitor the ventilation status of battery boxes, and control ventilation when necessary to prevent the explosion hazard caused by excessive hydrogen concentration inside the battery boxes, and ensure the safety of personnel and vehicle operation, is an important issue facing technical personnel.

[0004] Existing urban rail vehicle battery boxes are generally equipped with ventilation holes to expel hydrogen gas from the battery box through natural air convection. The ventilation holes are typically of the following form: Figure 1 As shown.

[0005] The ventilation holes in the battery box allow for free exchange of air between the inside and outside. Battery boxes typically have two or more ventilation holes, such as... Figure 2 As shown. When the air inside the box flows out through vent 1, the air outside the box flows in through vent 2. At this time, the hydrogen gas inside the battery box will be discharged outside the box through the vent.

[0006] Disadvantages of existing technology:

[0007] 1. The ventilation of the battery box relies entirely on natural air convection, resulting in unstable ventilation. When the vehicle is stationary and the surrounding space is relatively enclosed, the air convection conditions between the ventilation holes are poor, which ultimately leads to a reduction in the ventilation of the battery box and a slower hydrogen exhaust rate. Over time, this can easily lead to excessively high hydrogen concentrations inside the box, thereby posing an explosion risk.

[0008] 2. Battery box ventilation status cannot be detected. The existing solution cannot detect the battery box ventilation status. When ventilation is poor, the battery box cannot send the problem information to the vehicle, failing to provide effective early warning information to the operators and reducing vehicle safety. Summary of the Invention

[0009] To address the problems of existing battery box ventilation volume not being detectable and ventilation relying entirely on passive air convection, this invention provides an active ventilation system for urban rail vehicle battery boxes, comprising:

[0010] A ventilation volume detection module that monitors the ventilation volume of N ventilation holes in real time;

[0011] A control unit receives N ventilation volume values ​​from N ventilation volume detection modules; calculates the ventilation volume per unit time based on a preset unit time within the control unit; the control unit uses an active ventilation control method to determine whether active ventilation is needed based on the ventilation volume values; and issues a control signal when active ventilation is needed.

[0012] The execution module, which receives the control signal sent by the control unit, is installed at the front end of the ventilation duct of the battery box and executes the command to open the air passage.

[0013] A ventilation module connected to the execution module provides a ventilation source for air convection inside the battery and ventilates the inside of the battery.

[0014] Furthermore, the active ventilation control method compares the ventilation volume with a preset threshold to determine whether to output a ventilation command.

[0015] Furthermore, the process of comparing the ventilation volume with a preset threshold to determine whether to output a ventilation command is as follows:

[0016] When the ventilation volume per unit time exceeds the first threshold, it indicates that the ventilation status inside the battery box is good, and no ventilation command is issued.

[0017] When the ventilation volume per unit time is less than or equal to the first threshold and greater than or equal to the second threshold, it indicates that the ventilation status of the battery box is normal, and no ventilation command is issued.

[0018] When the ventilation volume per unit time is less than the second threshold, a ventilation command is issued, indicating that the ventilation status of the battery box is poor.

[0019] Furthermore, the ventilation volume detection module adopts a blade-type flow detection device, a hot-wire-type flow detection device, or other devices that meet the requirements.

[0020] Furthermore: the air source module includes an air compressor and an air cylinder, and the air compressor and the air cylinder are connected to each other.

[0021] Furthermore, the ventilation volume value is determined by the actual number N of ventilation holes in the battery box, the size of the ventilation holes, and the effective cross-sectional area of ​​the ventilation holes.

[0022] Furthermore, the execution module employs a solenoid valve.

[0023] Furthermore, the first and second thresholds are both determined by factors such as battery capacity, charging current, ambient temperature, and gas volume inside the battery box.

[0024] A method for controlling ventilation in a battery box of an urban rail vehicle includes the following steps:

[0025] Step 1: Detect the ventilation volume of the battery box and obtain ventilation volume information;

[0026] Step 2: Convert the ventilation volume electrical signal to obtain a value reflecting the ventilation volume of the battery box per unit time;

[0027] Step 3: When the ventilation volume per unit time is greater than the first threshold, close the ventilation solenoid valve, indicating that the battery box ventilation status is good;

[0028] Step 4: When the ventilation volume per unit time is less than or equal to the first threshold and greater than or equal to the second threshold, close the ventilation solenoid valve and report a general signal for the ventilation status of the battery box;

[0029] Step 5: When the ventilation volume per unit time is less than the second threshold, the solenoid valve opens and indicates that the battery box ventilation is poor. Once the solenoid valve is open, it will close only when the ventilation volume per unit time is detected to be greater than the first threshold.

[0030] This invention provides an active ventilation system for a battery box in urban rail vehicles. This system can detect the ventilation volume of the battery box per unit time and control the ventilation accordingly. This application enables real-time detection of the battery box's ventilation status and allows for active ventilation when ventilation is poor. This further avoids the risk of battery box explosion due to excessively high hydrogen concentration. The system can detect the battery box's ventilation status and actively ventilate when ventilation is poor, ensuring a low hydrogen concentration in the battery box through forced ventilation. This prevents battery box explosions caused by excessive hydrogen concentration, improves vehicle operational safety, and protects personal and property safety.

[0031] The present invention has the following advantages:

[0032] 1. This invention can detect the ventilation status of the battery box in real time through a ventilation volume detection module installed at the ventilation hole, thus solving the drawback of existing battery boxes that cannot detect the ventilation status of the battery box.

[0033] 2. The novel active ventilation system for battery boxes described in this invention can achieve active ventilation control of the battery box by judging the actual ventilation status of the battery box, which solves the problem that the ventilation of existing battery boxes relies entirely on passive air convection, and further avoids the problem that the explosion may be caused by excessive hydrogen concentration in the battery box, thereby improving vehicle safety.

[0034] 3. By comparing the actual ventilation volume with the preset threshold, the ventilation status of the battery box can be determined and uploaded to the vehicle, providing operators with accurate information on the ventilation status of the battery box, which facilitates the safe use of the battery. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a picture of the actual ventilation holes in the battery box;

[0037] Figure 2 This is a diagram showing the ventilation status of the battery box;

[0038] Figure 3 This is a schematic diagram of the battery box ventilation system.

[0039] Figure 4 This is a diagram of the active ventilation system for the battery box;

[0040] Figure 5 This is the control logic flowchart of the control unit. Detailed Implementation

[0041] It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0044] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0045] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0046] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0047] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0048] Figure 3 This is a schematic diagram of the battery box ventilation system.

[0049] Figure 4 This is a diagram of the active ventilation system for the battery box;

[0050] An active ventilation system for a battery box of an urban rail vehicle includes N ventilation volume detection modules, a control unit, an execution module, and an air source module;

[0051] The N ventilation volume detection modules detect the ventilation volume of the N ventilation holes in real time; the ventilation volume detection modules are installed in the ventilation holes of the battery box.

[0052] The control unit receives N ventilation volume values ​​sent by N ventilation volume detection modules; the control unit parses the ventilation volume signals to obtain the current wind speed v (unit: m / s), and multiplies the effective cross-sectional area s (unit: square meters) of the actual ventilation hole of the battery box and the unit time t (unit: seconds) preset in the control unit to obtain the ventilation volume per unit time (unit: cubic meters), as shown in formula (1):

[0053] Q = vs (1)

[0054] The ventilation volume per unit time is compared with the first threshold and the second threshold to determine the ventilation status of the battery box. Specifically, an active ventilation control method is used based on the ventilation volume value to determine whether active ventilation is required. When active ventilation is required, a control signal is issued. The control unit is used to process the ventilation volume information and control the operation of the ventilation solenoid valve. The ventilation volume detection module detects the ventilation status of the battery box in real time. After analysis and processing by the control unit, the on / off state of the ventilation solenoid valve is controlled, thereby realizing the active ventilation control of the battery box.

[0055] The execution module receives the control signal sent by the control unit, is installed at the front end of the ventilation duct of the battery box, and executes the command to open the air passage.

[0056] The air source module is connected to the execution module to provide an air source for air convection inside the battery and to ventilate the inside of the battery.

[0057] The air source module is connected to the execution module through a ventilation duct, and the execution module is connected to the battery through a ventilation duct.

[0058] The battery box ventilation duct can be connected to the rear pipeline of the ventilation solenoid valve to introduce air into the battery box, providing basic conditions for battery box ventilation.

[0059] The ventilation ducts of the battery box are mainly laid inside the battery box, which can connect external air sources to the battery box.

[0060] The ventilation ducts are mainly located at the bottom of the battery box, and their length and shape can be designed according to actual needs. The ventilation ducts are equipped with one or more air outlets to meet the air circulation requirements; the ducts can be connected to a vehicle air source to evenly release outside air into the battery box.

[0061] The air supply module and piping mainly provide the hardware conditions for the ventilation of the battery box, ensuring that the ventilation system can work effectively.

[0062] Figure 5 This is the control logic flowchart of the control unit;

[0063] Furthermore, the active ventilation control method compares the ventilation volume with a preset threshold to determine whether to output a ventilation command. After detecting the ventilation volume of the battery box per unit time, it compares the first and second preset thresholds for battery box ventilation volume in the control unit, and determines whether to ventilate or stop ventilation based on the comparison result.

[0064] The first and second thresholds are set based on a comprehensive calculation of factors such as battery capacity, charging current, ambient temperature, and gas volume inside the battery box.

[0065] The first threshold is greater than the second threshold;

[0066] The process of comparing the ventilation volume with a preset threshold to determine whether to issue a ventilation command is as follows:

[0067] When the ventilation volume per unit time is less than the second threshold, the solenoid valve opens and sends a ventilation command, indicating that the ventilation status of the battery box is poor. Once the solenoid valve is open, it will only close when the ventilation volume per unit time is detected to be greater than the first threshold.

[0068] When the ventilation volume per unit time is greater than or equal to the second threshold and less than or equal to the first threshold, the solenoid valve closes, indicating that the battery box ventilation status is normal and no ventilation command is issued.

[0069] When the ventilation volume per unit time exceeds the first threshold, it indicates that the ventilation status inside the battery box is good, the solenoid valve closes, and no ventilation command is issued.

[0070] The unit time can be set in the control unit. The unit time ventilation volume refers to the total effective ventilation volume of the battery box within a set period of time.

[0071] Furthermore, the ventilation volume detection module can convert ventilation volume into an electrical signal and output it externally, using a blade-type flow detection device or a hot-wire-type flow detection device.

[0072] Furthermore, the air source module includes an air compressor and an air cylinder, which are connected to each other. The air source module mainly provides air to the vehicle and is connected to the ventilation solenoid valve through an air circuit. When the ventilation solenoid valve is opened, it can supply air to the battery.

[0073] Furthermore, the ventilation volume value is set according to the actual number, size, and effective ventilation area of ​​the battery box.

[0074] The execution module employs a solenoid valve. This ventilation solenoid valve is an electromagnetic brake, typically featuring a low-voltage coil, used to open or close the ventilation duct. Installed at the front end of the battery box's ventilation duct, the ventilation solenoid valve can execute commands from the control unit to open or close the airflow, supplying air to the battery box.

[0075] A ventilation control method for the battery box of an urban rail vehicle, the control method is as follows:

[0076] Step 1: Detect the ventilation volume of the battery box and obtain ventilation volume information.

[0077] The above steps involve a module that can detect ventilation volume, which can convert ventilation volume into an electrical signal and output it to the outside in real time.

[0078] Step 2: Convert the ventilation volume electrical signal to obtain a value reflecting the ventilation volume of the battery box per unit time;

[0079] After receiving the ventilation volume electrical signal, the control unit converts the signal to obtain the current wind speed (unit: m / s). Based on the cross-sectional area of ​​the actual ventilation hole in the battery box (unit: square meters) and the unit time preset in the control unit (unit: seconds), the three values ​​are multiplied to obtain the ventilation volume per unit time. The unit time can be preset and saved according to needs, for example, it can be set to 1800 seconds.

[0080] Step 3: When the ventilation volume per unit time exceeds the first threshold, close the ventilation solenoid valve and report a signal that the battery box ventilation status is good.

[0081] The ventilation solenoid valve can receive ventilation commands from the control unit to control the opening and closing of the air path, while simultaneously isolating the vehicle's air supply device from the ventilation duct inside the battery box. The first threshold is an absolute safety limit; when the ventilation volume per unit time exceeds the first threshold, it indicates that the current battery box ventilation volume can completely expel the hydrogen in the box or dilute the hydrogen to maintain its content at a low level.

[0082] Step 4: When the ventilation volume per unit time is less than or equal to the first threshold and greater than or equal to the second threshold, close the ventilation solenoid valve and report a general signal for the ventilation status of the battery box;

[0083] The second threshold is a critical safety limit. When the ventilation volume per unit time is greater than or equal to the second threshold, it means that the current ventilation volume of the battery box is just enough to dilute the hydrogen and keep its content below the blast point. If the ventilation volume per unit time is less than the second threshold, it means that the current ventilation volume of the battery box is insufficient to dilute the hydrogen and keep its content below the blast point, and active ventilation is required.

[0084] Step 5: When the ventilation volume per unit time is less than the second threshold, the solenoid valve opens and indicates that the battery box ventilation is poor. Once the solenoid valve is open, it will only close when the ventilation volume per unit time is detected to be greater than the first threshold.

[0085] It is important to emphasize that when the ventilation volume per unit time is less than the second threshold and the system starts active ventilation, this state will continue until the detected ventilation volume per unit time is greater than the first threshold before stopping. This process is significantly different from step 4.

[0086] This control method determines the ventilation status and actively ventilates the battery box. It compares the ventilation volume per unit time with the system's built-in threshold to determine the battery box ventilation status and make ventilation control decisions. The battery box ventilation status information is then uploaded to the vehicle.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A main ventilation system for a battery box of a city rail vehicle, characterized in that: include A ventilation volume detection module that monitors the ventilation volume of N ventilation holes in real time; A control unit receives N ventilation volume values ​​from N ventilation volume detection modules; calculates the ventilation volume per unit time based on a preset unit time within the control unit; the control unit uses an active ventilation control method to determine whether active ventilation is needed based on the ventilation volume values; and issues a control signal when active ventilation is needed. The execution module, which receives the control signal sent by the control unit, is installed at the front end of the ventilation duct of the battery box and executes the command to open the air passage. A ventilation module connected to the execution module to provide a ventilation source for air convection inside the battery box and to ventilate the inside of the battery box; The active ventilation control method compares the ventilation volume with a preset threshold to determine whether to output a ventilation command. The process is as follows: When the ventilation volume per unit time is less than the second threshold, a ventilation command is issued, indicating that the ventilation status of the battery box is poor. When the ventilation volume per unit time is greater than or equal to the second threshold and less than or equal to the first threshold, it indicates that the ventilation status of the battery box is normal and no ventilation command is issued. When the ventilation volume per unit time is greater than the first threshold, it indicates that the ventilation status inside the battery box is good, and no ventilation command is issued. The ventilation volume value is determined by the actual number of ventilation holes in the battery box, the size of the ventilation holes, and the effective cross-sectional area of ​​the ventilation holes. The first threshold and the second threshold are both determined by the battery capacity, charging current, ambient temperature, and gas volume inside the battery box.

2. The active ventilation system for a battery box of a city rail vehicle according to claim 1, characterized in that: The ventilation volume detection module uses a blade-type flow detection device or a hot-wire-type flow detection device.

3. The active ventilation system for a battery box of an urban rail vehicle according to claim 1, characterized in that: The air source module includes an air compressor and an air cylinder, which are connected together.

4. The active ventilation system for a battery box of an urban rail vehicle according to claim 1, characterized in that: The execution module uses a solenoid valve.

5. A ventilation control method for a battery box in an urban rail vehicle, characterized in that: Includes the following steps: Step 1: Detect the ventilation volume of the battery box and obtain ventilation volume information; Step 2: Convert the ventilation volume electrical signal, and combine it with the actual number of ventilation holes, ventilation hole size and effective cross-sectional area of ​​the ventilation holes in the battery box to obtain a value reflecting the ventilation volume of the battery box per unit time; Step 3: When the ventilation volume per unit time is greater than the first threshold, close the ventilation solenoid valve, indicating that the battery box ventilation status is good; Step 4: When the ventilation volume per unit time is less than or equal to the first threshold and greater than or equal to the second threshold, close the ventilation solenoid valve and report a general signal for the ventilation status of the battery box; Step 5: When the ventilation volume per unit time is less than the second threshold, the solenoid valve opens and indicates that the battery box ventilation is poor. Once the solenoid valve is open, it will close only when the ventilation volume per unit time is detected to be greater than the first threshold.

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