Discharging system of storage battery and protection method thereof
Through standard voltage source calibration voltage detection and temperature rise coefficient control discharge, combined with memory alloy circuit breaker and intermittent discharge, the problem of degradation of the voltage measurement module and insufficient early warning of temperature detection is solved, and the safety and data accuracy of the discharge system are improved. , extends the service life of the battery.
Patent Information
- Application Number
- CN202411379002.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2024-12-27
AI Technical Summary
During the long-term use of existing discharge instruments, the accuracy of the voltage measurement module has decreased, resulting in frequent error data in battery charge and discharge tests, and insufficient early warning of the temperature detection of the discharge circuit, which can easily lead to irreversible damage or accidents.
Use standard voltage sources for voltage detection and calibration, avoid voltage detection accuracy from being affected by battery voltage through the first and second switches, set the temperature sensor and controller to terminate discharge according to the temperature rise coefficient, use memory alloy circuit breakers and intermittent discharge methods to improve safety and monitoring accuracy.
It improves voltage detection accuracy, enhances the timeliness and safety of the discharge process, avoids potential accidents caused by incorrect data collection and excessive temperature, and extends the service life of the battery.
Smart Images
Figure CN119209825A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of battery discharge, and in particular to a battery discharge system and a protection method thereof. Background Art
[0002] The battery is an important part of the DC power supply system of the substation. It mainly provides stable and reliable power guarantee for the secondary system load in the power system to ensure the normal operation of the substation. Therefore, it is necessary to conduct regular charge and discharge tests on the substation batteries to ensure the stable operation of the batteries. Currently, the substation needs to conduct charge and discharge tests on the newly invested batteries every two years, and after four years, the batteries need to be charged and discharged every year.
[0003] When conducting a discharge test, the existing discharge meter needs to set each voltage acquisition module at both ends of each battery. The number of batteries in a typical substation is between 104 and 108. Therefore, the battery voltage acquisition and discharge work lasts for a long time. During the long working process, the accuracy of the voltage measurement module will decrease, and the staff cannot find the accuracy problem of the voltage measurement module in time, so a large amount of erroneous data will be obtained after the measurement is completed, which reduces the accuracy of the inspection. Summary of the invention
[0004] The content of this application is used to introduce concepts in a brief form, which will be described in detail in the detailed implementation section below. The content of this application is not intended to identify the key features or essential features of the technical solution claimed for protection, nor is it intended to limit the scope of the technical solution claimed for protection.
[0005] As a first aspect of the present application, in order to solve the technical problems mentioned in the above background technology section, some embodiments of the present application provide a battery discharge system, including:
[0006] An information processing module is provided with a plurality of positive input terminals and negative input terminals corresponding to the positive input terminals;
[0007] A plurality of positive electrode connection lines are provided, one end of the positive electrode connection line is connected to the positive electrode input terminal, and the other end is connected to the positive electrode of the battery;
[0008] A plurality of negative electrode connection lines are provided, one end of the negative electrode connection line is connected to the negative electrode input terminal, and the other end is connected to the negative electrode of the battery;
[0009] The information processing module includes:
[0010] A voltage detection circuit, used to detect the voltage of a battery connected to the positive electrode connection line and the negative electrode connection line;
[0011] a discharge circuit, for discharging a storage battery connected to the positive electrode connection line and the negative electrode connection line;
[0012] The information processing module also includes:
[0013] A test circuit, the test circuit comprising at least a standard voltage source;
[0014] a first switch, wherein when the first switch is closed, the test circuit is connected to the voltage detection circuit, and whether there is a fault is determined according to the voltage detection result of the voltage detection circuit on the standard voltage source;
[0015] When the first switch is disconnected, the test circuit is disconnected from the voltage detection circuit, and the voltage detection circuit is used to detect the battery voltage.
[0016] In the technical solution provided by the present application, a standard voltage source and a first switch are provided, so that the voltage detection is calibrated with the standard voltage source. When the voltage detection result is not accurate, the standard voltage source can be used to promptly discover the problem of the voltage detection circuit, avoiding the collection of inaccurate data without being able to discover it.
[0017] Furthermore, the standard voltage source is a variable voltage source.
[0018] Furthermore, the voltage detection circuit further includes a second switch, and when the second switch is closed, the voltage detection circuit is connected to the positive connection line and the negative connection line, and when the second switch is opened, the voltage detection circuit is disconnected from the positive connection line and the negative connection line;
[0019] When the second switch is closed, the first switch is opened, and when the second switch is opened, the first switch is closed.
[0020] In the solution provided in the present application, by setting the first switch and the second switch to be closed at different times, the influence of the battery voltage can be avoided when calibrating the detection accuracy of the voltage detection circuit, thereby ensuring the accuracy of the voltage calibration.
[0021] Furthermore, a relay is provided on the test circuit, the second switch is a normally closed contact of the relay, and the first switch is a normally open contact of the relay.
[0022] In the technical solution provided in the present application, a relay is arranged on the test circuit. When the test circuit is energized, the normally closed contacts of the relay are disconnected and then the normally open contacts are closed. This ensures that the first switch and the second switch are not closed at the same time, thereby avoiding a large amount of current rushing to the voltage detection circuit during voltage calibration, thereby ensuring the safety of the circuit.
[0023] As the second aspect of the present application, the discharge circuit will need to release the electrical energy in the battery. When releasing the electrical energy, it is necessary to avoid the fire of components caused by the release of electrical energy. At present, the monitoring of the discharge circuit relies on the temperature detection sensor to detect the temperature of the discharge resistor. If the temperature of the discharge resistor exceeds the preset threshold, an alarm is issued and the discharge is terminated. This early warning method lacks early warning. If the threshold is set very high, when it is found that the temperature exceeds the preset threshold, irreversible damage has been caused to the discharger. There may be a fault inside, or an ignition point has appeared. If the threshold is set very low, the temperature of the discharger during normal operation will be very close to the threshold, and it is easy to trigger the threshold during normal operation, resulting in the termination of the discharge work. A more serious situation is that the temperature detection sensor itself fails. At this time, the temperature of the discharge resistor will no longer be effectively controlled, and accidents are very likely to occur. To this end, the present application provides the following technical solutions:
[0024] The information processing module also includes
[0025] A third switch is arranged on the discharge circuit. When the third switch is closed, the discharge circuit discharges the battery. When the third switch is opened, the discharge circuit is disconnected from the battery.
[0026] A temperature sensor is used to detect the temperature of a discharge resistor in a discharge circuit and obtain temperature data of the discharge resistor changing with time;
[0027] The controller is connected to the temperature sensor signal and calculates the temperature rise coefficient of the discharge resistor according to the temperature data. If the temperature rise coefficient exceeds a preset threshold, the controller terminates the discharge of the discharge circuit.
[0028] In the technical solution provided in the present application, the controller does not directly control whether to terminate the discharge based on the temperature monitored by the temperature sensor, but controls whether to terminate the discharge based on the temperature rise coefficient. When the temperature rise coefficient is high, it indicates that there is an abnormal discharge phenomenon, so the discharge behavior can be terminated in time before the temperature generated by the abnormal discharge behavior reaches the preset threshold, thereby increasing the timeliness of monitoring.
[0029] Because of the characteristics of the discharge resistor, the rate of temperature rise at different temperatures is not constant. Generally speaking, when the temperature is low, the corresponding temperature rise coefficient will be larger, and when the temperature is high, the temperature rise coefficient will be smaller. Therefore, the accuracy of using the temperature rise coefficient to determine whether to terminate the discharge is not high. When the discharge circuit works for a long time and then slowly rises until a fault occurs, the temperature rise coefficient cannot be used to detect such problems. To this end, the application provides the following solution:
[0030] The information processing module further includes: a storage device, wherein the storage device stores temperature data of the discharge resistor when a certain fault occurs;
[0031] The control module receives the temperature data of the discharge resistor in real time. If the similarity between the received temperature data and the temperature data in the storage is greater than a similarity threshold, the controller terminates the discharge of the discharge circuit.
[0032] In the solution provided in the present application, whether to terminate the discharge is not simply controlled based on the temperature rise threshold, but the discharge is terminated based on the matching of the temperature data with the samples in the storage. If the discharge resistor shows abnormal discharge behavior, the temperature data will suddenly have a large similarity with the abnormal samples in the storage, thereby timely and accurately discovering the abnormal discharge behavior of the discharge resistor.
[0033] Furthermore, a memory alloy circuit breaker is provided on the discharge circuit, and the memory alloy is a two-way memory alloy.
[0034] When the discharge circuit is in working state and the discharge resistor discharges abnormally, the memory alloy circuit breaker will automatically fuse due to the temperature rise, thereby disconnecting the discharge circuit in time to avoid further temperature rise of the discharge circuit and fire accidents. In addition, compared with ordinary fuse circuit breakers, the memory alloy circuit breaker provided by the present application can be reused, and the staff does not need to replace the fuse after each fuse. Compared with the current limiting protector, the memory alloy circuit breaker in this scheme retains the temperature accumulation characteristics of the fuse circuit breaker. When working, it does not directly control the on and off of the memory alloy according to the current size. The memory alloy circuit breaker will only disconnect after accumulating enough heat, so it can well avoid the influence of the large current generated at the beginning on the memory alloy circuit breaker.
[0035] Furthermore, the memory alloy circuit breaker comprises:
[0036] Fixed seat;
[0037] A first contact piece, fixedly connected to the fixing seat;
[0038] A second contactor is fixedly connected to the fixing seat;
[0039] The first contact has at least two first high-temperature shapes and a first low-temperature shape affected by temperature;
[0040] The second contact has at least two second high-temperature shapes and a second low-temperature shape affected by temperature;
[0041] Wherein, when the first contact piece and the second contact piece are in the first high temperature shape and the second high temperature shape respectively, the first contact piece and the second contact piece are disconnected from each other;
[0042] When the first contact piece and the second contact piece are in the first low-temperature shape and the second low-temperature shape respectively, the first contact piece and the second contact piece are closed to each other.
[0043] In the technical solution provided by the present application, the first contact and the second contact are set to two shapes that are affected by temperature, so as to directly disconnect as the temperature between the first contact and the second contact accumulates during the discharge process, thereby avoiding rapid temperature rise caused by abnormally large current due to device failure during discharge. At the same time, the discharge process can also be controlled to avoid the temperature of the discharge circuit rising continuously due to long-term discharge, thereby playing a role in controlling the maximum discharge amount.
[0044] Further, when the first contact member and the second contact member are in the low temperature shape, the surface where the first low temperature shape and the second low temperature shape contact each other is a plane;
[0045] When the first contact piece and the second contact piece are in the high temperature shape, the surfaces corresponding to each other in the first low temperature shape and / or the second low temperature shape are arc-shaped surfaces.
[0046] In this solution, when the first contact piece and the second contact piece are working normally, there is surface contact between the two, so relatively speaking, the contact area is large, the resistance is small, and the heat generation is small. However, if the first contact piece and the second contact piece begin to change to a high-temperature shape as the current increases, or as the heat accumulates, the planes in contact with each other will begin to become arc-shaped surfaces. In this process, the contact surface between the first contact piece and the second contact piece becomes smaller, the resistance increases, and the heat generation increases. The temperature rise coefficient of the first contact piece and the second contact piece will become faster, thereby accelerating the process of disconnecting the first contact piece and the second contact piece and increasing the rate of triggering temperature protection.
[0047] Furthermore, both the first contact piece and the second contact piece are in contact with the discharge resistor via insulating heat-conductive material.
[0048] In this solution, the first contact piece and the second contact piece are connected to the discharge resistor through the insulating heat-conducting material, so the memory alloy circuit breaker can monitor the discharge resistor. When a fault occurs inside the discharge resistor or the heat dissipation system of the discharge resistor fails, and abnormal heat accumulation occurs, the memory alloy circuit breaker can detect it in time and issue an early warning.
[0049] As the third aspect of the present application, some embodiments of the present application provide a protection method, including: the controller is connected to a third switch signal; the controller periodically controls the third switch to open and close; wherein the ratio of the third switch opening time to the third switch closing time is less than or equal to 1:10.
[0050] This solution has the following beneficial effects:
[0051] The solution has the following effects:
[0052] (1) Reduce the discharge resistance temperature and battery temperature to improve safety. As the temperature rises, the internal resistance of the lead-acid battery will decrease. When the internal resistance drops to a certain level, the battery output current will also increase. When the temperature is too high, the internal chemical reaction of the battery will accelerate, causing the battery to "dry out", which in turn causes the battery capacity to decrease and the internal resistance to increase, thus reducing the battery life. In this scheme, the internal resistance of the battery can be prevented from continuously increasing through periodic charging and discharging, thereby reducing the battery drying phenomenon and increasing the battery life.
[0053] (2) The accuracy of monitoring the discharge process is increased. In this solution, the temperature rise data of the discharge resistor is used to determine whether there is an abnormal discharge condition. Therefore, it is necessary to avoid long-term continuous discharge. In this solution, intermittent discharge is adopted, so the temperature of the discharge resistor will continue to fall back to a bottom value, thus ensuring that the temperature data of the discharge resistor has more meaningful temperature rise data during the entire discharge process.
[0054] (3) This solution uses a memory alloy circuit breaker to prevent the continuous accumulation of heat in the memory alloy circuit breaker and physically disconnect the discharge circuit, thereby avoiding the safety hazard caused by the use of temperature sensors for temperature measurement, that is, the temperature sensor is abnormal or the temperature processing system is abnormal and the discharge circuit cannot be disconnected normally, thereby ensuring the safety of discharge. BRIEF DESCRIPTION OF THE DRAWINGS
[0055] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The illustrative embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application.
[0056] In addition, throughout the drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and that the components and elements are not necessarily drawn to scale.
[0057] In the attached picture:
[0058] Figure 1 This is a simplified circuit diagram of the battery discharge system.
[0059] Figure 2 This is the circuit diagram of the voltage detection circuit.
[0060] Figure 3 This is the circuit diagram of the discharge circuit.
[0061] Figure 4 This is a schematic diagram of the structure when the contact is set to spring style.
[0062] Figure 5 This is a schematic diagram of the structure when the contact is set to metal part style.
[0063] Figure 6 Schematic diagram of the contact surface.
[0064] Reference numerals:
[0065] 1. A first contact member;
[0066] 2. A second contact member;
[0067] 3. Fixed seat;
[0068] 1a. Contact surface. DETAILED DESCRIPTION
[0069] Embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present application. It should be understood that the drawings and embodiments of the present application are only for exemplary purposes and are not intended to limit the scope of protection of the present application.
[0070] It should also be noted that, for ease of description, only the parts related to the invention are shown in the drawings. In the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other.
[0071] The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments.
[0072] Example 1: Reference Figure 1 The discharge system of the battery includes: an information processing module, a positive electrode connection line, and a negative electrode connection line. Among them, the positive electrode connection line and the negative electrode connection line are electrically connected to the information processing module respectively. The positive electrode connection line and the negative electrode connection line are wires, the positive electrode connection line is used to connect the positive electrode of the battery, and the negative electrode connection line is used to connect the negative electrode of the battery. After the positive and negative electrodes of the battery are connected to the positive and negative electrode connection lines, the information processing module can discharge the battery and detect the voltage.
[0073] Furthermore, the information processing module includes a voltage detection circuit, a discharge circuit, a test circuit, and a first switch.
[0074] The voltage detection circuit is used to detect the voltage of the battery, and the discharge circuit is used to discharge the battery. The voltage detection circuit includes a voltage detector. The voltage measurement can be completed by connecting the positive and negative electrodes of the battery to the positive and negative electrodes of the voltage detector respectively.
[0075] The corresponding discharge circuit includes a discharge resistor, and it is only necessary to connect the positive and negative electrodes of the battery to the two ends of the discharge circuit respectively.
[0076] In this way, the discharge resistor and the voltage detector are in parallel, so in practice, discharge and voltage detection can be performed simultaneously. The circuit diagram of the battery, voltage detector, and discharge resistor is as follows: Figure 2 shown.
[0077] Furthermore, the test circuit is used to calibrate the accuracy of voltage detection of the voltage detector. The test circuit includes at least one standard voltage source. The standard voltage source is a variable voltage source, and the standard voltage source can output a set voltage, for example, providing a standard voltage of 10V or 20V. Therefore, when the test circuit is connected in parallel with the voltage detector, the voltage detector can detect the voltage of the standard voltage source. If the voltage detected by the voltage detector is the same as the standard voltage, it means that there is no problem with the voltage detector. If the difference exceeds the voltage detection threshold, it means that there is a problem with the measurement accuracy of the voltage detector, and a new battery discharge system needs to be replaced.
[0078] Among them, the first switch is set on the test circuit, and the first switch is connected in series with the standard voltage source. In this way, when the first switch is closed, the test circuit is connected to the voltage detection circuit, and whether there is a fault is determined based on the voltage detection result of the voltage detection circuit on the standard voltage source; when the first switch is disconnected, the test circuit is disconnected from the voltage detection circuit, and the voltage detection circuit is used to detect the battery voltage.
[0079] In a more specific implementation scheme, in order to avoid the voltage detector being affected by the battery voltage during testing, a second switch is also provided on the voltage detection circuit. When the second switch is closed, the voltage detection circuit is connected to the positive connection line and the negative connection line, and when the second switch is opened, the voltage detection circuit is disconnected from the positive connection line and the negative connection line; when the second switch is closed, the first switch is opened, and when the second switch is opened, the first switch is closed.
[0080] In this solution, the second switch is connected in series with the voltage detector, so the second switch is used to control whether the voltage detector is connected to the battery. The first switch is used to control whether the voltage detector is connected to the standard power supply.
[0081] Furthermore, a relay is provided on the test circuit, the second switch is a normally closed contact of the relay, and the first switch is a normally open contact of the relay. In this solution, when the relay is powered on, the normally closed contact of the relay is disconnected, and then the normally open contact is closed, so that one relay is used in this solution to control the closing and opening of the first switch and the second switch.
[0082] In this way, by setting a relay in this solution, it is possible to effectively avoid the first switch and the second switch being closed at the same time. During the time, if the first switch is pressed, the second switch will be automatically opened.
[0083] Embodiment 2: Embodiment 2 differs from Embodiment 1 in that several protection measures are provided for the discharge circuit. Specifically: the information processing module further includes a third switch, a temperature sensor, and a controller. The third switch is provided on the discharge circuit. When the third switch is closed, the discharge circuit discharges the battery. When the third switch is disconnected, the discharge circuit is disconnected from the battery. The third switch is connected in series with the discharge resistor, so that the on and off of the third switch can control the on and off of the discharge. The third switch is an electromagnetic relay, and the on and off of the controller is controlled.
[0084] The temperature sensor is arranged on the discharge resistor to detect the temperature of the discharge resistor and obtain the temperature data of the discharge resistor changing with time; the controller is connected with the temperature sensor signal and controls whether the third switch is turned on or off according to the temperature data.
[0085] In some embodiments, the controller is connected to the temperature sensor signal and calculates the temperature rise coefficient of the discharge resistor according to the temperature data. If the temperature rise coefficient exceeds a preset threshold, the controller terminates the discharge of the discharge circuit.
[0086] In some other embodiments, the information processing module further includes: a storage device, wherein the storage device stores temperature data of the discharge resistor when a certain fault occurs;
[0087] The control module receives the temperature data of the discharge resistor in real time. If the similarity between the received temperature data and the temperature data in the storage is greater than a similarity threshold, the controller terminates the discharge of the discharge circuit.
[0088] Embodiment 3: Embodiment 3 provides further protection measures to further ensure the safety of the discharge circuit.
[0089] A memory alloy circuit breaker is provided on the discharge circuit. The memory alloy circuit breaker is connected in series with the discharge resistor, so the memory alloy circuit breaker forms a protection switch. When the current passing through the discharge circuit increases abnormally, the temperature inside the memory alloy circuit breaker will rise, and then memory deformation will occur to disconnect the circuit, thereby playing a protective role. The memory alloy is a two-way memory alloy. The two-way memory alloy has two different shapes at high temperature and low temperature.
[0090] Specifically: the memory alloy circuit breaker includes: a fixing seat 3, a first contact 1, and a second contact 2. Among them, the fixing seat 3 is an insulating shell, which is used to fix the first contact 1 and the second contact 2. The structure and requirements of the fixing seat 3 are not required. As a need, a certain deformation space is required in the fixing seat 3 so that the first contact 1 can be connected or disconnected. The first contact 1 is fixedly connected to the fixing seat 3; the second contactor is fixedly connected to the fixing seat 3. The fixed connection between the first contact 1 and the second contact 2 and the fixing seat 3 means that the connecting part is fixedly connected. In fact, only a part of the area between the fixing seat 3 and the first contact 1 and the second contact 2 is connected. The fixing seat 3 only plays a fixing role for the first contact 1 and the second contact 2 to ensure that the first contact 1 and the second contact 2 will not fall off. The first contact 1 and the second contact 2 can be deformed freely in the area where the first contact 1 and the second contact 2 are disconnected from the fixing seat 3.
[0091] The first contact 1 has at least two first high-temperature shapes and a first low-temperature shape affected by temperature; the second contact 2 has at least two second high-temperature shapes and a second low-temperature shape affected by temperature; wherein, when the first contact 1 and the second contact 2 are in the first high-temperature shape and the second high-temperature shape respectively, the first contact 1 and the second contact 2 are disconnected from each other; when the first contact 1 and the second contact 2 are in the first low-temperature shape and the second low-temperature shape respectively, the first contact 1 and the second contact 2 are closed to each other.
[0092] like Figure 4 As shown: As an embodiment: the first contact 1 and the second contact 2 are respectively constructed as helical springs, and then a contact surface 1a is set at each end. In a low temperature state, the first contact 1 and the second contact 2 are unfolded, and the contact surfaces 1a of the first contact 1 and the second contact 2 are connected. In a high temperature state, the first contact 1 and the second contact 2 become helical springs, so the length is reduced, and then the first contact 1 and the second contact 2 are disconnected from each other.
[0093] like Figure 5 As shown: In another embodiment, the high temperature shapes of the first contact member 1 and the second contact member 2 are metal members flipped in opposite directions. The low temperature shapes of the first contact member 1 and the second contact member 2 are straight metal members. Therefore, in the low temperature state, the first contact member 1 and the second contact member 2 overlap each other to form a passage. In the high temperature state, the ends of the two move in opposite directions, thereby disconnecting.
[0094] The above two implementations both utilize the shape of the memory alloy at different temperatures to control the opening and closing of the memory alloy circuit breaker. Both define the general structure of the first contact piece 1 and the second contact piece 2.
[0095] Furthermore, when the first contact member 1 and the second contact member 2 are in the low temperature shape, the surface where the first low temperature shape and the second low temperature shape contact each other is a plane;
[0096] When the first contact member 1 and the second contact member 2 are in the high temperature shape, the surfaces corresponding to the first low temperature shape and / or the second low temperature shape are arc-shaped surfaces.
[0097] In this solution, the shape of the interface between the first contact member 1 and the second contact member 2 is further controlled, so that the time for disconnection between the first contact member 1 and the second contact member 2 can be reduced.
[0098] refer to Figure 6 , the surface where the first contact member 1 and the second contact member 2 meet at low temperature is set as a variable contact surface 1a. The variable contact surface 1a is a plane at low temperature. It is an arc surface at high temperature. Therefore, when the temperature of the first contact member 1 and the second contact member 2 gradually increases, the two variable contact surfaces 1a will gradually change into arc surfaces, so the resistance of the contact part will gradually increase, and then further accumulate heat, increase the deformation rate, and then increase the disconnection rate. Figure 6 The figure in the figure shows the shape when the first contact surface 1a and the second contact surface 1a are not completely disconnected.
[0099] Furthermore, the first contact member 1 and the second contact member 2 are both connected to the discharge circuit via an insulating thermal conductive material, which may be silica gel, metal oxide, or the like.
[0100] Embodiment 4: Embodiment 4 differs from Embodiment 2 in that a protection method is provided. It is used to protect the discharge process. The protection method can avoid the risk of circuit fire caused by excessive temperature accumulation during the discharge process. Specifically:
[0101] The controller is connected to the third switch signal; the controller periodically controls the third switch to open and close; wherein the ratio of the time when the third switch is opened to the time when the third switch is closed is less than or equal to 1:10.
[0102] In this solution, intermittent discharge is adopted during discharge, that is, discharge for 30 seconds and stop for 3 seconds. In this way, the use of this solution has the following effects:
[0103] (1) Reduce the discharge resistance temperature and battery temperature to improve safety. As the temperature rises, the internal resistance of the lead-acid battery will decrease. When the internal resistance drops to a certain level, the battery output current will also increase. When the temperature is too high, the internal chemical reaction of the battery will accelerate, causing the battery to "dry out", which in turn causes the battery capacity to decrease and the internal resistance to increase, thus reducing the battery life. In this scheme, the internal resistance of the battery can be prevented from continuously increasing through periodic charging and discharging, thereby reducing the battery drying phenomenon and increasing the battery life.
[0104] (2) The accuracy of monitoring the discharge process is increased. In this solution, the temperature rise data of the discharge resistor is used to determine whether there is an abnormal discharge condition. Therefore, it is necessary to avoid long-term continuous discharge. In this solution, intermittent discharge is adopted, so the temperature of the discharge resistor will continuously fall back to a lower value, thus ensuring that the temperature data of the discharge resistor has more meaningful temperature rise data during the entire discharge process.
[0105] (3) This solution uses a memory alloy circuit breaker, which uses the different low-temperature and high-temperature shapes of the memory alloy to set the circuit breaker, avoiding the safety hazards caused by the use of temperature sensors to measure temperature, that is, the temperature sensor is abnormal or the temperature processing system is abnormal and the discharge circuit cannot be disconnected normally, ensuring the safety of discharge. At the same time, when the temperature of the memory alloy drops to a low temperature, the memory alloy circuit breaker returns to the shape of the circuit being connected, and the system does not need to continue to work like replacing a fuse.
[0106] The above description is only some preferred embodiments of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the embodiments of the present application is not limited to the technical solutions formed by the specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above invention concept. For example, the above features are replaced with (but not limited to) the technical features with similar functions disclosed in the embodiments of the present application to form a technical solution.
Claims
1. A battery discharge system, comprising: An information processing module is provided with a plurality of positive input terminals and negative input terminals corresponding to the positive input terminals; A plurality of positive electrode connection lines are provided, one end of the positive electrode connection line is connected to the positive electrode input terminal, and the other end is connected to the positive electrode of the battery; A plurality of negative electrode connection lines are provided, one end of the negative electrode connection line is connected to the negative electrode input terminal, and the other end is connected to the negative electrode of the battery; The information processing module includes: A voltage detection circuit, used to detect the voltage of a battery connected to the positive electrode connection line and the negative electrode connection line; a discharge circuit, for discharging a storage battery connected to the positive electrode connection line and the negative electrode connection line; Features: The information processing module also includes: A test circuit, the test circuit comprising at least a standard voltage source; a first switch, wherein when the first switch is closed, the test circuit is connected to the voltage detection circuit, and whether there is a fault is determined according to the voltage detection result of the voltage detection circuit on the standard voltage source; When the first switch is disconnected, the test circuit is disconnected from the voltage detection circuit, and the voltage detection circuit is used to detect the battery voltage.
2. The battery discharge system according to claim 1, characterized in that: The standard voltage source is a variable voltage source.
3. The battery discharge system according to claim 2, characterized in that: The voltage detection circuit also includes a second switch, when the second switch is closed, the voltage detection circuit is connected to the positive connection line and the negative connection line, and when the second switch is opened, the voltage detection circuit is disconnected from the positive connection line and the negative connection line; When the second switch is closed, the first switch is opened, and when the second switch is opened, the first switch is closed.
4. The battery discharge system according to claim 3, characterized in that: The test circuit is provided with a relay, the second switch is a normally closed contact of the relay, and the first switch is a normally open contact of the relay.
5. The battery discharge system according to claim 3, characterized in that: The information processing module also includes: A third switch is arranged on the discharge circuit. When the third switch is closed, the discharge circuit discharges the battery. When the third switch is opened, the discharge circuit is disconnected from the battery. A temperature sensor is used to detect the temperature of a discharge resistor in a discharge circuit and obtain temperature data of the discharge resistor changing with time; The controller is connected to the temperature sensor signal and calculates the temperature rise coefficient of the discharge resistor according to the temperature data. If the temperature rise coefficient exceeds a preset threshold, the controller terminates the discharge of the discharge circuit.
6. The battery discharge system according to claim 2, characterized in that: The information processing module further includes: a storage device, wherein the storage device stores temperature data of the discharge resistor when a certain fault occurs; The control module receives the temperature data of the discharge resistor in real time. If the similarity between the received temperature data and the temperature data in the storage is greater than a similarity threshold, the controller terminates the discharge of the discharge circuit.
7. The battery discharge system according to any one of claims 1 to 6, characterized in that: A memory alloy circuit breaker is arranged on the discharge circuit, and the memory alloy is a two-way memory alloy.
8. The battery discharge system according to claim 7, characterized in that: The memory alloy circuit breaker comprises: Fixed seat; A first contact piece, fixedly connected to the fixing seat; A second contactor is fixedly connected to the fixing seat; The first contact has at least two first high-temperature shapes and a first low-temperature shape affected by temperature; The second contact has at least two second high-temperature shapes and a second low-temperature shape affected by temperature; Wherein, when the first contact piece and the second contact piece are in the first high temperature shape and the second high temperature shape respectively, the first contact piece and the second contact piece are disconnected from each other; When the first contact piece and the second contact piece are in the first low-temperature shape and the second low-temperature shape respectively, the first contact piece and the second contact piece are closed to each other.
9. The battery discharge system according to claim 8, characterized in that: When the first contact member and the second contact member are in the low temperature shape, the surface where the first low temperature shape and the second low temperature shape contact each other is a plane; When the first contact piece and the second contact piece are in the high temperature shape, the surfaces corresponding to each other in the first low temperature shape and / or the second low temperature shape are arc-shaped surfaces.
10. A protection method, characterized in that: The discharging system for the battery as claimed in any one of claims 5 to 6, wherein the protection method comprises: The controller is connected to the third switch signal; the controller periodically controls the third switch to open and close; wherein the ratio of the time when the third switch is opened to the time when the third switch is closed is less than or equal to 1:10.