BMU electric leakage and equalization function detection device based on super capacitor

Abstract

The utility model discloses a BMU electric leakage and equalization function detection device based on a super capacitor, comprising a super capacitor plate and an equalization circuit, the super capacitor plate is composed of 12 capacitors C1-C12, each capacitor is sequentially connected in parallel with voltage stabilizing diodes D2-D13, and is sequentially connected in series with magnetic beads L1-L12; the equalization circuit is an equalization circuit board, current distribution of each capacitor is dynamically adjusted during charging, and an equalization sub-circuit of the equalization circuit carries out voltage monitoring and regulation through transistors, a voltage division network and diodes / LED elements. The utility model provides a low-cost electric leakage and charge-discharge detection device which is suitable for a battery management system. The device is composed of a super capacitor plate and an equalization circuit. The super capacitor board simulates the charging and discharging characteristics of the lithium battery by connecting a plurality of capacitors and diodes in series and cooperating with the magnetic beads.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery management system (BMS) and its equalizing device test field, especially, relate to a kind of through super capacitor board simulation battery unit charging and discharging process, for quickly detecting whether BMU equalizing device exists leakage and the low-cost device for evaluating its equalization function. BACKGROUND

[0002] In battery management system, function test and leakage detection are crucial links for equalizing device. At present, the traditional test method usually takes lithium battery as test carrier. However, this way has many defects: first, lithium battery test scheme needs to be equipped with high-precision battery management circuit, which makes the overall cost of test system high, especially in the case of frequent equalization circuit test, the cost is greatly increased; second, the charging and discharging time of lithium battery is long, and when detecting leakage problem, the charging and discharging state of battery needs to be monitored for a long time, which is difficult to meet the demand of rapid detection, and the test efficiency is low; third, lithium battery itself has large capacity and high internal resistance, which is easily disturbed by self-discharge and other factors during test, resulting in large discount of leakage detection accuracy, and unable to realize rapid and accurate leakage detection; fourth, the existing test scheme often needs multiple battery units to test cooperatively, and the circuit design is complex and tedious, which is difficult to integrate into low-cost and miniaturized system, limiting its application scenarios. SUMMARY

[0003] In order to make up for the shortcomings of the prior art, the present application provides a low-cost leakage and charging and discharging detection device, mainly applied to battery management system. The device mainly consists of super capacitor board and equalization circuit. Among them, the super capacitor board is configured by a plurality of capacitors and diodes in series, and cooperates with magnetic beads to simulate the charging and discharging characteristics of lithium battery.

[0004] In order to solve the above technical problems, the utility model provides the following technical scheme:

[0005] A BMU leakage and equalization function detection device based on super capacitor, comprising a super capacitor board and an equalization circuit, the super capacitor board is composed of 12 capacitors C1-C12, each capacitor is connected in parallel with a voltage stabilizing diode D2-D13 in turn, and is connected in series with a magnetic bead L1-L12 in turn; the equalization circuit is an equalization circuit board, which dynamically adjusts the current distribution of each capacitor during charging, and the equalization subcircuit uses transistors, voltage dividing networks, diodes / LED elements for voltage monitoring and control.

[0006] As a further technical scheme of the utility model: the model of diode D2-D13 is SMA5917A, the voltage stabilizing value is 4.7V, and the reverse voltage is 50V.

[0007] As a further technical solution of this utility model: the rated voltage of each capacitor is 2.5V.

[0008] As a further technical solution of this utility model: one end of the supercapacitor plate is connected to a resistor R1, the other end of the resistor R1 is connected to the negative terminal of a diode D1, and the positive terminal of the diode D1 is connected to the voltage VCC.

[0009] As a further technical solution of this utility model: the diode D1 is of model number IN4007.

[0010] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0011] 1. Reduced cost: No need to use lithium batteries and a corresponding high-voltage management system, resulting in low hardware costs.

[0012] 2. Rapid leakage detection: With its small capacity and fast charging and discharging, voltage changes can be observed in a short time once leakage occurs.

[0013] 3. High detection accuracy: By using the BMU equalization device in conjunction with the matching equalization board, the voltage change during the charging and discharging of the capacitor board is more obvious, which helps to effectively evaluate the equalization function.

[0014] 4. High safety: Supercapacitors have no risk of self-discharge and will not cause safety hazards due to overcharging / over-discharging.

[0015] 5. Strong compatibility: The number of capacitors can be increased or decreased according to needs, and it has good expandability. Attached Figure Description

[0016] Figure 1 This is the circuit diagram of this utility model. Detailed Implementation

[0017] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0018] Example 1, such as Figure 1 As shown, a BMU leakage current and equalization function detection device based on supercapacitors includes a supercapacitor board and an equalization circuit.

[0019] Among them, the supercapacitor board design:

[0020] Capacitor configuration: The super capacitor board consists of 12 capacitors (C1-C12), each rated at 2.5V. This design allows for fast charging and discharging, meeting the requirements of rapid detection.

[0021] Voltage stabilization protection: Each capacitor is connected in parallel with a voltage stabilizing diode (SMA5917A) with a voltage of 4.7V and a reverse voltage of 50V. Its main function is to protect the capacitor during operation and stabilize the voltage across the capacitor, ensuring stable operation.

[0022] Anti-interference measures: To suppress high-frequency interference during charging and discharging, magnetic beads (L1-L12) are connected in series with each capacitor. These magnetic beads effectively ensure the stability of the super capacitor board during charging and discharging, improving detection accuracy.

[0023] Balancing board:

[0024] Current regulation: The invention is equipped with a dedicated balancing circuit board. During charging, this balancing circuit board dynamically adjusts the current distribution of each capacitor, ensuring that all capacitor voltages remain consistent and stabilize at around 2.5V, achieving balanced charging of the capacitors.

[0025] Voltage monitoring and regulation: The balancing sub-circuit is cleverly constructed using transistors, voltage dividing networks, diodes / LEDs, and other components. Through the coordinated work of these components, real-time monitoring and precise regulation of capacitor voltage are achieved, effectively preventing overcharging or over-discharging of the capacitors, further ensuring the safe and stable operation of the capacitors.

[0026] Workflow as follows:

[0027] Charging and balancing phase: The external power supply is input into the device through interface J1. At this time, the balancing board begins to work, detecting the voltage of each capacitor in real time and automatically adjusting the current based on the detection results, allowing each capacitor to be successfully charged to 2.5V. When the balancing charging is complete, the voltages of each capacitor remain consistent.

[0028] Detection phase: Connect the fully charged capacitor board to the BMU balancing device or load through interfaces J1 and J2. After connection, the voltage drop process of the capacitor board is continuously monitored. If there is a leakage or an abnormal discharge rate, it can be detected in time. In this process, the balancing function of the BMU can also be verified, achieving multifunctional integrated detection.

[0029] It is apparent for a person skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit or the essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary and in no way limiting, the scope of the present application being defined by the claims hereafter rather than the above description, and all the changes which fall within the meaning and the scope of the equivalent elements of the claims are intended to be comprised in the present application.

[0030] Furthermore, it should be understood that, although the present specification is described according to the embodiments, not every embodiment contains only one independent technical solution, and the present specification is described in this way only for the sake of clarity, and a person skilled in the art should consider the present specification as a whole, and the technical solutions in each embodiment are also appropriately combined to form other embodiments which are easily understood by a person skilled in the art.

Claims

1. A supercapacitor-based BMU leakage and balancing function detection device, comprising a supercapacitor plate and a balancing circuit, characterized in that: The super capacitor board is composed of 12 capacitors C1-C12, each capacitor is connected with a voltage stabilizing diode D2-D13 in parallel, and the capacitors are connected with magnetic beads L1-L12 in series; the equalizing circuit is an equalizing circuit board, which dynamically adjusts the current distribution of each capacitor during charging, and the equalizing sub-circuit uses transistors, voltage dividing networks, diodes / LED elements for voltage monitoring and regulation.

2. The BMU leakage and equalization function detection device based on super capacitor according to claim 1, characterized in that, The model of the diodes D2-D13 is SMA5917A, the voltage stabilizing value is 4.7V, and the reverse voltage resistance is 50V.

3. The BMU leakage and equalization function detection device based on super capacitor according to claim 1, characterized in that, The rated voltage of each capacitor is 2.5V.

4. The BMU leakage and equalization function detection device based on super capacitor according to claim 1, characterized in that, One end of the super capacitor board is connected with a resistor R1, the other end of the resistor R1 is connected with the negative electrode of a diode D1, and the positive electrode of the diode D1 is connected with a voltage VCC.

5. The BMU leakage and equalization function detection device based on super capacitor according to claim 1, characterized in that, The model of the diode D1 is IN4007.

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