A battery current equalization detection system

Abstract

The utility model provides a kind of battery current-sharing detection system, battery includes: first positive pole, second positive pole, first negative pole and second negative pole, system includes: the first current analog signal that flows through first positive pole is converted into the first voltage analog signal of first Hall current acquisition circuit, the second current analog signal that flows through second negative pole is converted into the second voltage analog signal of second Hall current acquisition circuit, the first voltage analog signal is converted into the first voltage digital signal and the second voltage analog signal is converted into the second voltage digital signal of ADC acquisition circuit, by the power module of the power supply of battery charging and discharging of preset current digital signal and according to the first voltage digital signal, second voltage digital signal and preset current digital signal determine the current size of respectively flowing through first positive pole, second positive pole, first negative pole and second negative pole of MCU chip, the current size for determining whether battery current-sharing is abnormal respectively flowing through above four pole.

Description

Technical Field

[0001] This utility model relates to the field of battery testing technology, and in particular to a battery current sharing testing system. Background Technology

[0002] Traditional two-terminal batteries sample the positive and negative currents through the power module system. However, for four-terminal batteries (two positive and two negative), existing power module systems cannot collect the current sharing of the four-terminal batteries. In other words, they cannot monitor the current of each of the four terminals in real time and cannot determine the overcurrent of each terminal. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides a battery current sharing detection system. Through the first Hall current acquisition circuit, the second Hall current acquisition circuit, the ADC acquisition circuit, the power module for charging or discharging the battery through a preset current digital signal, and the MCU chip in the detection system, the magnitudes of the currents flowing through the first positive terminal, the second positive terminal, the first negative terminal, and the second negative terminal of the battery can be determined to determine whether the battery current sharing is abnormal. If the magnitudes of the first current digital signal, the second current digital signal, the third current digital signal, and the fourth current digital signal are not completely the same, then the battery current sharing is determined to be abnormal.

[0004] In a first aspect, this utility model provides a battery current sharing detection system, the battery comprising: a first positive terminal, a second positive terminal, a first negative terminal, and a second negative terminal, the detection system comprising:

[0005] The first Hall current acquisition circuit converts the acquired analog current signal flowing through the first positive terminal into an analog voltage signal.

[0006] The second Hall current acquisition circuit converts the acquired analog current signal flowing through the second negative terminal into an analog voltage signal.

[0007] An ADC acquisition circuit that converts a first analog voltage signal into a first digital voltage signal and a second analog voltage signal into a second digital voltage signal.

[0008] A power module used to charge or discharge a battery via a preset digital current signal, and

[0009] An MCU chip determines the magnitude of the current flowing through the first positive terminal, the second positive terminal, the first negative terminal, and the second negative terminal based on a first voltage digital signal, a second voltage digital signal, and a preset current digital signal; wherein,

[0010] The first Hall current acquisition circuit is connected to the first positive terminal and the ADC acquisition circuit, respectively. The second Hall current acquisition circuit is connected to the second negative terminal and the ADC acquisition circuit, respectively. The ADC acquisition circuit is also connected to the MCU chip, and the MCU chip is also connected to the power module. The magnitude of the current flowing through the first positive terminal, the second positive terminal, the first negative terminal, and the second negative terminal is used to determine whether the battery current sharing is abnormal.

[0011] In conjunction with the first aspect, in one optional embodiment, the first positive terminal and the second positive terminal are disposed on a first side of the battery, wherein the first side is any side of the battery.

[0012] In conjunction with the first aspect, in one optional embodiment, the first positive terminal and the first negative terminal are both disposed on the second side of the battery, and the second positive terminal and the second negative terminal are both disposed on the third side of the battery, wherein the second side and the third side are different sides of the battery.

[0013] In conjunction with the first aspect, in one optional implementation, the communication module connected to the MCU chip is connected to the power module via a CAN communication line or an RS485 communication line to receive a preset current digital signal from the power module to charge or discharge the battery.

[0014] In conjunction with the first aspect, in one optional implementation, the MCU chip is specifically used for:

[0015] Based on the magnitude of the first voltage digital signal, and using a lookup table that includes the correspondence between voltage and current magnitudes, the magnitude of the first current digital signal corresponding to the first voltage digital signal is determined.

[0016] The magnitude of the third current digital signal flowing through the second positive terminal is determined by performing a difference calculation between the magnitude of the obtained preset current digital signal and the magnitude of the first current digital signal.

[0017] Based on the magnitude of the second voltage digital signal, and using a lookup table that includes the correspondence between voltage and current magnitudes, the magnitude of the corresponding second current digital signal is determined.

[0018] The magnitude of the fourth current digital signal flowing through the first negative terminal is determined by performing a difference calculation between the magnitude of the obtained preset current digital signal and the magnitude of the second current digital signal.

[0019] If the magnitudes of the first, second, third, and fourth current digital signals are not completely identical, then an abnormal battery current sharing is determined.

[0020] In conjunction with the first aspect, an optional implementation further includes:

[0021] An output module is used to highlight received abnormal information or output an alarm sound in response to received abnormal information. The output module is connected to an MCU chip that outputs abnormal information to the output module after determining that the battery current sharing is abnormal.

[0022] In conjunction with the first aspect, in one alternative implementation,

[0023] The power module is connected to an MCU chip that outputs control commands to the power module after determining that the battery current sharing is abnormal. The control commands are used to instruct the power module to stop charging or discharging the battery.

[0024] This invention provides a battery current sharing detection system. The battery includes a first positive terminal, a second positive terminal, a first negative terminal, and a second negative terminal. The detection system includes: a first Hall current acquisition circuit that converts a first analog current signal flowing through the first positive terminal into a first analog voltage signal; a second Hall current acquisition circuit that converts a second analog current signal flowing through the second negative terminal into a second analog voltage signal; an ADC acquisition circuit that converts the first analog voltage signal into a first digital voltage signal and the second analog voltage signal into a second digital voltage signal; a power module for charging or discharging the battery using a preset digital current signal; and a system that calculates the voltage based on the first digital voltage signal, the second digital voltage signal, and the preset digital current signal. The signal determines the magnitude of the current flowing through the first positive terminal, the second positive terminal, the first negative terminal, and the second negative terminal, respectively, using an MCU chip. The first Hall current acquisition circuit is connected to the first positive terminal and the ADC acquisition circuit, the second Hall current acquisition circuit is connected to the second negative terminal and the ADC acquisition circuit, the ADC acquisition circuit is also connected to the MCU chip, and the MCU chip is also connected to the power module. The magnitudes of the currents flowing through the first positive terminal, the second positive terminal, the first negative terminal, and the second negative terminal can be used to jointly determine whether the battery current sharing is abnormal. If the magnitudes of the first current digital signal, the second current digital signal, the third current digital signal, and the fourth current digital signal are not completely identical, then the battery current sharing is determined to be abnormal. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of a battery current sharing detection system provided by this utility model;

[0027] Figure 2 This is a schematic diagram of a comparison table provided by this utility model. Detailed Implementation

[0028] The technical solutions of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0029] It should be noted that the terms "first," "second," "third," and "fourth" in this utility model are only used to distinguish different poles, Hall current acquisition circuits, analog current signals, analog voltage signals, digital current signals, digital voltage signals, and sides, etc., and have no other meaning. They should not be used to limit the scope of protection of this utility model.

[0030] See Figure 1 This is a schematic diagram of a battery current sharing detection system provided by this utility model, as shown below. Figure 1 As shown, specifically, the battery includes, but is not limited to: a first positive terminal, a second positive terminal, a first negative terminal, and a second negative terminal; the detection system may include, but is not limited to:

[0031] The first Hall current acquisition circuit converts the acquired analog current signal flowing through the first positive terminal into an analog voltage signal.

[0032] The second Hall current acquisition circuit converts the acquired analog current signal flowing through the second negative terminal into an analog voltage signal.

[0033] An ADC (Analog to Digital Converter) acquisition circuit that converts a first analog voltage signal into a first digital voltage signal and a second analog voltage signal into a second digital voltage signal.

[0034] A power module used to charge or discharge a battery via a preset digital current signal, and

[0035] An MCU (Micro Controller Unit) chip determines the magnitude of the current flowing through the first positive terminal, the second positive terminal, the first negative terminal, and the second negative terminal based on the first voltage digital signal, the second voltage digital signal, and a preset current digital signal; wherein,

[0036] The first Hall current acquisition circuit is connected to the first positive terminal and the ADC acquisition circuit, respectively. The second Hall current acquisition circuit is connected to the second negative terminal and the ADC acquisition circuit, respectively. The ADC acquisition circuit is also connected to the MCU chip, and the MCU chip is also connected to the power module. The magnitudes of the currents flowing through the first positive terminal, the second positive terminal, the first negative terminal, and the second negative terminal are used to determine whether the battery current sharing is abnormal. The power module may include, but is not limited to, any of the following: an AD / DC (Alternating Current to Direct Current) converter module for AC / DC conversion, a DC / DC (Direct Current to Direct Current Converter) converter module for DC-DC conversion, or a magnetically integrated module that combines an AD / DC converter module and a DC / DC converter module.

[0037] It should be noted that the first current analog signal, the second current analog signal, the first voltage analog signal, and the second voltage analog signal are all analog signals; the first voltage digital signal, the second voltage digital signal, and the preset current digital signal are all digital signals.

[0038] It should be noted that the power module charges or discharges the battery using a preset current digital signal;

[0039] Optionally, the first positive terminal and the second positive terminal are disposed on a first side of the battery, wherein the first side can be any side of the battery. Specifically, as shown below... Figure 1 As shown, the first positive terminal and the second positive terminal are both positive terminals of the battery.

[0040] Optionally, the first positive terminal and the first negative terminal are both disposed on the second side of the battery, and the second positive terminal and the second negative terminal are both disposed on the third side of the battery, wherein the second side and the third side are different sides of the battery, and the first negative terminal and the second negative terminal are both negative terminals of the battery.

[0041] Optionally, the detection system may also include: a communication module connected to the MCU chip, which is connected to the power module via a CAN communication line or an RS485 communication line to receive a preset current digital signal from the power module to charge or discharge the battery.

[0042] Optionally, the communication module, MCU chip, and ADC acquisition circuit can be integrated onto a single circuit board.

[0043] Optionally, the MCU chip can be used specifically for:

[0044] Based on the magnitude of the first voltage digital signal, and using a lookup table that includes the correspondence between voltage and current magnitudes, the magnitude of the first current digital signal corresponding to the first voltage digital signal is determined.

[0045] The magnitude of the preset current digital signal is calculated by subtracting the magnitude of the first current digital signal from the magnitude of the preset current digital signal to determine the magnitude of the third current digital signal flowing through the second positive terminal. Specifically, the magnitude of the preset current digital signal is subtracted from the magnitude of the first current digital signal, and the resulting first difference is used as the magnitude of the third current digital signal flowing through the second positive terminal.

[0046] Based on the magnitude of the second voltage digital signal, and using a lookup table that includes the correspondence between voltage and current magnitudes, the magnitude of the corresponding second current digital signal is determined.

[0047] The magnitude of the preset current digital signal and the magnitude of the second current digital signal are calculated by difference to determine the magnitude of the fourth current digital signal flowing through the first negative terminal; specifically, the magnitude of the preset current digital signal is subtracted from the magnitude of the second current digital signal, and the resulting second difference is used as the magnitude of the fourth current digital signal flowing through the first negative terminal.

[0048] If the magnitudes of the first, second, third, and fourth current digital signals are not entirely the same, then an abnormal battery current sharing is identified. Specifically,

[0049] If the magnitude of the first current digital signal is the same as the magnitude of the second current digital signal, but the magnitude of the third current digital signal is different from the magnitude of the fourth current digital signal, then the current sharing between the first negative terminal and the second negative terminal is abnormal.

[0050] If the magnitude of the first current digital signal is different from the magnitude of the second current digital signal, but the magnitude of the third current digital signal is the same as the magnitude of the fourth current digital signal, then the current sharing between the first positive terminal and the second positive terminal is abnormal.

[0051] If the magnitude of the first current digital signal is different from the magnitude of the second current digital signal, and the magnitude of the third current digital signal is different from the magnitude of the fourth current digital signal, then the current sharing between the first positive terminal and the second positive terminal is abnormal, and the current sharing between the first negative terminal and the second negative terminal is also abnormal.

[0052] It should be noted that the first voltage digital signal, the second voltage digital signal, the first current digital signal, the second current digital signal, the third current digital signal, and the fourth current digital signal are all digital signals; the first current analog signal, the second current analog signal, the first voltage analog signal, and the second voltage analog signal are all analog signals.

[0053] It should be noted that the aforementioned comparison table is as follows: Figure 2 As shown, the lookup table includes several voltages and currents, as well as the correspondence between them. Each voltage corresponds to one current. The voltage in the lookup table represents the magnitude of the digital voltage signal, and the current in the lookup table represents the magnitude of the digital current signal. Specifically, the MCU chip can determine the magnitude of the second digital current signal corresponding to the second voltage signal by referring to the lookup table based on the magnitude of the digital voltage signal.

[0054] For example, the magnitude of voltage B corresponds to the magnitude of current b, and the magnitude of voltage G corresponds to the magnitude of current g. That is, the MCU chip can determine the magnitude of current b based on the magnitude of voltage B.

[0055] Optionally, the detection system may also include:

[0056] An output module is used to highlight received abnormal information or output an alarm sound in response to received abnormal information. The output module is connected to an MCU chip that outputs abnormal information to the output module after determining that the battery current sharing is abnormal.

[0057] In other words, the detection system may also include: an output module connected to an MCU chip, wherein the MCU chip may also be used for:

[0058] After identifying the battery current sharing anomaly, output the anomaly information to the output module;

[0059] The output module is used to highlight abnormal information or to output an alarm sound in response to received abnormal information.

[0060] Optionally, the power module is connected to an MCU chip that outputs control commands to the power module after determining that the battery current sharing is abnormal. The control commands are used to instruct the power module to stop charging or discharging the battery.

[0061] In other words, the MCU chip can also be used for:

[0062] After identifying an abnormal battery current sharing, a control command is output to the power module to control the power module to stop charging or discharging the battery, or...

[0063] After determining that the battery current sharing is abnormal, the control power module bypasses the battery with abnormal current sharing.

[0064] Figure 1-2 This is merely used to explain the embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0065] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A battery current sharing detection system, the battery comprising: The system comprises a first positive terminal, a second positive terminal, a first negative terminal, and a second negative terminal, characterized in that the detection system includes: The first Hall current acquisition circuit converts the acquired analog current signal flowing through the first positive terminal into an analog voltage signal. The second Hall current acquisition circuit converts the acquired analog current signal flowing through the second negative terminal into an analog voltage signal. An ADC acquisition circuit that converts a first analog voltage signal into a first digital voltage signal and a second analog voltage signal into a second digital voltage signal. A power module used to charge or discharge a battery via a preset digital current signal, and An MCU chip determines the magnitude of the current flowing through the first positive terminal, the second positive terminal, the first negative terminal, and the second negative terminal based on a first voltage digital signal, a second voltage digital signal, and a preset current digital signal; wherein, The first Hall current acquisition circuit is connected to the first positive terminal and the ADC acquisition circuit, respectively. The second Hall current acquisition circuit is connected to the second negative terminal and the ADC acquisition circuit, respectively. The ADC acquisition circuit is also connected to the MCU chip, and the MCU chip is also connected to the power module. The magnitude of the current flowing through the first positive terminal, the second positive terminal, the first negative terminal, and the second negative terminal is used to determine whether the battery current sharing is abnormal.

2. The battery current sharing detection system as described in claim 1, characterized in that, The first positive terminal and the second positive terminal are disposed on the first side of the battery, wherein the first side can be any side of the battery.

3. The battery current sharing detection system as described in claim 1, characterized in that, The first positive terminal and the first negative terminal are both located on the second side of the battery, and the second positive terminal and the second negative terminal are both located on the third side of the battery. The second side and the third side are different sides of the battery.

4. The battery current sharing detection system as described in claim 1, characterized in that, Also includes: The communication module, which is connected to the MCU chip, is connected to the power module via a CAN communication line or an RS485 communication line to receive preset current digital signals from the power module to charge or discharge the battery.

5. The battery current sharing detection system as described in claim 1, characterized in that, Also includes: An output module is used to highlight received abnormal information or output an alarm sound in response to received abnormal information. The output module is connected to an MCU chip that outputs abnormal information to the output module after determining that the battery current sharing is abnormal.

6. The battery current sharing detection system as described in claim 1, characterized in that, The power module is connected to an MCU chip that outputs control commands to the power module after determining that the battery current sharing is abnormal. The control commands are used to instruct the power module to stop charging or discharging the battery.

7. The battery current sharing detection system as described in claim 1, characterized in that, MCU chips are specifically used for: Based on the magnitude of the first voltage digital signal, and using a lookup table that includes the correspondence between voltage and current magnitudes, the magnitude of the first current digital signal corresponding to the first voltage digital signal is determined. The magnitude of the third current digital signal flowing through the second positive terminal is determined by performing a difference calculation between the magnitude of the obtained preset current digital signal and the magnitude of the first current digital signal. Based on the magnitude of the second voltage digital signal, and using a lookup table that includes the correspondence between voltage and current magnitudes, the magnitude of the corresponding second current digital signal is determined. The magnitude of the fourth current digital signal flowing through the first negative terminal is determined by performing a difference calculation between the magnitude of the obtained preset current digital signal and the magnitude of the second current digital signal. If the magnitudes of the first, second, third, and fourth current digital signals are not completely identical, then an abnormal battery current sharing is determined.

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