Battery detection circuit, battery system

Abstract

The present disclosure relates to the technical field of circuit detection, and particularly relates to a battery detection circuit, which comprises a first electric energy storage, a second electric energy storage, a first blocking circuit, an electric energy detection device and a control module. The first electric energy storage is connected to an external battery to be detected to store the electric energy discharged by the external battery to be detected. The second electric energy storage is connected to the first electric energy storage to store the electric energy discharged by the first electric energy storage. The first blocking circuit is used to connect the first electric energy storage and the second electric energy storage, and the control module controls the first blocking circuit to be closed so that the second electric energy storage is connected to the first electric energy storage to obtain the electric energy in the first electric energy storage. If the battery is disconnected, the electric energy detection device can detect the voltage drop of the first electric energy storage. The battery detection circuit provided by the present disclosure can quickly detect whether the external battery to be detected is disconnected through the cooperation of the first electric energy storage and the second electric energy storage.

Description

Technical Field

[0001] This disclosure relates to the field of circuit testing technology, and in particular to a battery testing circuit. Background Technology

[0002] Because the battery contains a BMS (Battery Management System), the BMS may disconnect the battery from the external environment under certain circumstances. Therefore, it is necessary to determine whether the battery is disconnected when it is not charging or discharging.

[0003] The charging and discharging circuits of a battery are separate. When the battery is fully charged, it will disconnect the charging circuit. Therefore, you cannot determine whether the battery is disconnected by the charging current.

[0004] The discharge circuit still exists, but detecting whether the battery is disconnected by using the discharge resistor in a power-consuming manner is inefficient. The larger the discharge resistor or the larger the battery terminal capacitance, the longer it takes to determine whether the battery is disconnected using the discharge resistor's power consumption method. Summary of the Invention

[0005] To solve the above-mentioned technical problems, or at least partially solve them, this disclosure provides a battery detection circuit that determines whether the battery is disconnected in a shorter time.

[0006] In a first aspect, this disclosure provides a battery detection circuit, the battery detection circuit comprising:

[0007] The first energy storage device is connected to the external battery under test to store the electrical energy released by the external battery under test.

[0008] A second energy storage device is connected to the first energy storage device to store the energy released by the first energy storage device.

[0009] A first blocking circuit, wherein a first terminal of the first blocking circuit is connected to a second energy storage device, a second terminal of the first blocking circuit is connected to the first energy storage device, and a third terminal of the first blocking circuit is a control terminal, wherein the third terminal is used to connect the first terminal and the second terminal of the first blocking circuit.

[0010] An electrical energy detection device, which is electrically connected to a first electrical energy storage device to detect the electrical energy in the first electrical energy storage device;

[0011] A control module is electrically connected to the third terminal of the first blocking circuit to control the connection or disconnection of the first blocking circuit.

[0012] Optionally, the positive terminal of the first energy storage device is connected to the positive terminal of the external battery under test, and the negative terminal of the first energy storage device is connected to the negative terminal of the external battery under test.

[0013] The first terminal of the second energy storage device is connected to the positive terminal of the first energy storage device, and the second terminal of the second energy storage device is connected to the first terminal of the first blocking circuit.

[0014] Optionally, the first blocking circuit includes a first transistor, a first terminal of the first transistor connected to a second terminal of the second energy storage device, a second terminal of the first transistor connected to the negative terminal of the first energy storage device, and a third terminal of the first transistor as a control terminal, the third terminal being used to turn on the first terminal and the second terminal of the first transistor.

[0015] The power detection device is electrically connected to the first power storage device to detect the power of the first power storage device;

[0016] The control module is electrically connected to the third terminal of the first transistor to control the conduction of the first transistor.

[0017] Optionally, the first transistor is a first MOS transistor, the first terminal of the first transistor is the drain of the first MOS transistor, the second terminal of the first transistor is the source of the first MOS transistor, and the third terminal of the first transistor is the gate of the first MOS transistor.

[0018] Optionally, the battery detection circuit further includes:

[0019] The second blocking circuit has a first terminal connected to the second energy storage device and a second terminal connected to an external power supply bus to output the energy stored in the second energy storage device to the external power supply bus. The third terminal of the second blocking circuit is a control terminal, which is used to connect the first terminal and the second terminal of the second blocking circuit.

[0020] The control module is electrically connected to the third terminal of the second blocking circuit to control the connection or disconnection of the second blocking circuit.

[0021] Optionally, the second blocking circuit includes a second transistor, the first terminal of which is connected to the second terminal of the second energy storage device, the second terminal of which is connected to an external power supply bus to output the energy stored in the second energy storage device, and the third terminal of the second transistor is a control terminal, which is used to turn on the first terminal and the second terminal of the second transistor.

[0022] The control module is electrically connected to the third terminal of the second transistor to control the conduction of the second transistor.

[0023] Optionally, the second transistor is a second MOS transistor, with the first terminal of the second transistor being the source of the second MOS transistor, the second terminal of the second transistor being the drain of the second MOS transistor, and the third terminal of the second transistor being the gate of the third MOS transistor.

[0024] Optionally, the first energy storage device is a capacitor or an inductor.

[0025] Optionally, the second energy storage device is a capacitor or an inductor.

[0026] Secondly, this disclosure also provides a battery system, including the battery detection circuit and the battery described in any of the first aspects.

[0027] The technical solution provided in this disclosure has the following advantages compared with the prior art:

[0028] The first energy storage device is connected to an external battery under test. The energy from the external battery under test continuously replenishes the first energy storage device to maintain a constant energy level. When the external battery under test is disconnected by the BMS, it can no longer replenish the energy in the first energy storage device.

[0029] At this time, the control module activates the first blocking circuit, and the second energy storage device draws energy from the first energy storage device, causing the energy stored in the first energy storage device to decrease. The energy detection device is electrically connected to the first energy storage device to detect its energy level. A decrease in the energy level of the first energy storage device indicates that the external battery under test has been disconnected. The battery detection circuit provided in this disclosure can quickly detect whether the external battery under test is disconnected. Attached Figure Description

[0030] Figure 1 This is one of the structural schematic diagrams of the battery detection circuit described in the embodiments of this disclosure;

[0031] Figure 2 This is a second schematic diagram of the battery detection circuit described in an embodiment of this disclosure;

[0032] Figure 3 This is the third schematic diagram of the battery detection circuit described in the embodiments of this disclosure;

[0033] Figure 4 This is a schematic diagram of the battery system described in an embodiment of this disclosure.

[0034] Among them, 1. First energy storage device; 2. Second energy storage device; 3. First blocking circuit; 4. Energy detection device; 5. Control module; 6. External battery under test; 7. Second blocking circuit; 8. External power supply bus; 9. Storage battery; 10. Storage battery system. Detailed Implementation

[0035] To better understand the above-mentioned objectives, features, and advantages of this disclosure, the solutions disclosed herein will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0036] Numerous specific details are set forth in the following description in order to provide a full understanding of this disclosure, but this disclosure may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some, and not all, of the embodiments of this disclosure.

[0037] Example 1:

[0038] Figure 1 This is one of the structural schematic diagrams of the battery detection circuit described in the embodiments of this disclosure. For example... Figure 1 As shown, the battery detection circuit includes

[0039] The first energy storage device 1 is connected to the external battery under test 6 to store the electrical energy released by the battery.

[0040] The second energy storage device 2 is connected to the first energy storage device 1 to store the electrical energy released by the first energy storage device 1;

[0041] The first blocking circuit 3 has a first end connected to the second energy storage device 2, a second end connected to the first energy storage device 1, and a third end as a control end, which is used to control the first blocking circuit 3 to be turned on.

[0042] An electrical energy detection device 4 is electrically connected to a first electrical energy storage device 1 to detect the electrical energy of the first electrical energy storage device 1.

[0043] Control module 5, which is electrically connected to the third terminal of the first blocking circuit 3, to control the conduction of the first transistor.

[0044] Specifically, when the external battery under test 6 is not disconnected, it is connected to the first energy storage device 1, and the energy stored in the first energy storage device 1 can be continuously replenished by the battery. After the control module 5 is activated and the first blocking circuit 3 is activated, the energy stored in the first energy storage device 1 enters the second energy storage device 2. However, because the external battery under test 6 is not disconnected, the energy stored in the second energy storage device 2 from the first energy storage device 1 is replenished by the external battery under test 6.

[0045] Therefore, when the first blocking circuit 3 is turned on by the control module 5, and the power detection device 4 detects that the power of the first power storage device has not changed, it can be determined that the battery has not been disconnected.

[0046] After the external battery under test 6 is disconnected, the input and output of the external battery under test 6 to the first energy storage 1 is shut down by the battery management system of the external battery under test 6. Therefore, after the control module 5 controls the first blocking circuit 3 to be turned on, the electrical energy stored in the first energy storage 1 will enter the second energy storage 2, and the electrical energy in the first energy storage 1 cannot be replenished.

[0047] Therefore, after the control module 5 controls the first blocking circuit 3 to be turned on, the power detection device 4 detects that the power of the first power storage device has decreased, and it can be determined that the battery has been disconnected.

[0048] In Embodiment 1 of this disclosure, the first energy storage device 1 and the second storage device are fast-charging and discharging storage devices. By measuring the change in the amount of energy stored in them, it is possible to quickly determine whether the battery is disconnected. This is in contrast to the prior art method that consumes the energy of an entire external battery under test 6 by connecting a bleed resistor and then testing whether the voltage of the external battery under test 6 changes. Because the external battery under test 6 stores a large amount of energy, the prior art method often requires a significant amount of time for the voltage of the external battery under test 6 to change, resulting in an excessively long determination time.

[0049] Example 2:

[0050] Figure 2 This is a second schematic diagram of the battery detection circuit described in an embodiment of this disclosure. Figure 2 As shown, the battery detection circuit based on Embodiment 1 further includes a second blocking circuit 7. The first end of the second blocking circuit 7 is connected to the second energy storage device 2, and the second end of the second blocking circuit 7 is connected to the external power supply bus 8 to output the energy stored in the second energy storage device 2 to the external power supply bus 8. The third end of the second blocking circuit 7 is a control end, which is used to control the second blocking circuit 7 to be turned on. The control module 5 is electrically connected to the third end of the second blocking circuit 7 to control the second blocking circuit 7 to be turned on.

[0051] Specifically, the second blocking circuit 7 is used to control the connection between the second energy storage device 2 and the external power supply bus 8. After the control module 5 controls the second blocking circuit 7 to be turned on, the electrical energy of the second energy storage device 2 can be delivered to the external power supply bus 8. The external power supply bus 8 can then deliver the electrical energy transmitted from the second energy storage device 2 to the load for its operation.

[0052] The battery detection circuit of Embodiment 2 of this disclosure can also feed back the electrical energy stored in the second energy storage device 2 to the external power supply bus 8 when the load is running, making full use of electrical energy. Compared with the prior art method of detecting by consuming electrical energy through a bleed resistor, it is more environmentally friendly and has a higher energy utilization rate.

[0053] Example 3:

[0054] Figure 3 This is the third schematic diagram of the battery detection circuit described in the embodiments of this disclosure. Figure 3 As shown, this is a battery detection circuit based on Embodiment 2.

[0055] In this embodiment, the first blocking circuit 3 includes a first transistor, and the second blocking circuit 7 includes a second transistor. The first transistor is a first MOSFET, and the second transistor is a second MOSFET. The first terminal of the first transistor is the drain of the first MOSFET, the second terminal of the first transistor is the source of the first MOSFET, and the third terminal of the first transistor is the gate of the first MOSFET. The first terminal of the second transistor is the source of the second MOSFET, the second terminal of the second transistor is the drain of the second MOSFET, and the third terminal of the second transistor is the gate of the third MOSFET.

[0056] The first energy storage device 1 is a capacitor, with its positive terminal connected to the positive terminal of the external battery 6 under test, and its negative terminal connected to the negative terminal of the external battery 6 under test, in order to obtain the energy stored in the capacitor. In other embodiments, the first energy storage device 1 may also be an inductor.

[0057] The second energy storage device 2 is an inductor. The first end of the inductor is connected to the positive terminal of the first energy storage device 1, and the second end of the inductor is connected to the first terminal of the first MOSFET. The second terminal of the first MOSFET is connected to the negative terminal of the first energy storage device 1, and the third terminal of the first MOSFET is a control terminal used to control the first transistor to conduct. The control module 5 is an MCU, connected to the gate of the first MOSFET to control its conduction. The energy detection device 4 is a voltage detection device electrically connected to both ends of a capacitor to detect the energy in the capacitor. In other embodiments, the second energy storage device 1 can also be a capacitor.

[0058] Specifically, when the MCU controls the first MOSFET to turn on, the energy of the capacitor will be stored in the inductor. If the external battery under test 6 is not disconnected, the energy of the capacitor will be replenished by the external battery under test 6. At this time, the voltage detection device connected across the capacitor to detect the energy of the capacitor will not detect a drop in the voltage of the capacitor, indicating that the external battery under test 6 is not disconnected.

[0059] If the external battery 6 under test is disconnected, the capacitor's energy will be drawn by the inductor, but the external battery 6 under test will not replenish the lost energy. Therefore, the voltage detection device will detect a drop in the capacitor's voltage, indicating that the external battery 6 under test has been disconnected.

[0060] The first terminal of the second MOSFET is connected to the second terminal of the inductor, and the second terminal of the second MOSFET is connected to the external power supply bus 8 to control the output of the electrical energy stored in the second energy storage device 2. The third terminal of the second MOSFET is the control terminal, which is used to control the conduction of the second transistor.

[0061] The MCU is electrically connected to the third terminal of the second MOSFET to control its conduction. After the MCU controls the second MOSFET to conduct, the electrical energy stored in the inductor will enter the external power supply bus 8, which will then power the load. This fully utilizes electrical energy, is more environmentally friendly, and has a higher energy efficiency.

[0062] Example 4:

[0063] like Figure 4 As shown, the battery system 10 includes a battery 9 and the battery detection circuit described in Embodiment 3. Because the battery 9 in the battery system 10 has a BMS (Battery Management System), the BMS will disconnect the battery 9 from the outside after being subjected to high temperature or excessive current surge, preventing the battery 9 from inputting or outputting electrical energy to the outside.

[0064] This situation needs to be addressed promptly, but it could be confused with the situation where battery 9 does not require charging or discharging.

[0065] The battery system 10 can detect whether the battery 9 in the battery system 10 is disconnected using the battery detection circuit described in Embodiment 3. In other embodiments, the battery detection circuit of the battery system 10 can also be any of the battery detection circuits described in Embodiments 1-3.

[0066] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0067] The above description is merely a specific embodiment of this disclosure, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery detection circuit, characterized in that, The battery detection circuit includes: a first energy storage device connected to an external battery under test to store the electrical energy released by the external battery under test; a second energy storage device connected to the first energy storage device to store the electrical energy released by the first energy storage device; a first blocking circuit, with a first terminal connected to the second energy storage device, a second terminal connected to the first energy storage device, and a third terminal serving as a control terminal for connecting the first and second terminals of the first blocking circuit; an energy detection device electrically connected to the first energy storage device to detect the electrical energy stored in the first energy storage device; and a control module electrically connected to the third terminal of the first blocking circuit to control the connection or disconnection of the first blocking circuit; the positive terminal of the first energy storage device is connected to the positive terminal of the external battery under test, and the negative terminal of the first energy storage device is connected to the external battery under test. The battery has a negative terminal; a first terminal of the second energy storage device is connected to the positive terminal of the first energy storage device, and a second terminal of the second energy storage device is connected to the first terminal of the first blocking circuit; the first blocking circuit includes a first transistor, a first terminal of the first transistor is connected to the second terminal of the second energy storage device, the second terminal of the first transistor is connected to the negative terminal of the first energy storage device, and a third terminal of the first transistor is a control terminal used to conduct the first and second terminals of the first transistor; an energy detection device is electrically connected to the first energy storage device to detect the energy of the first energy storage device; a control module is electrically connected to the third terminal of the first transistor to control the conduction of the first transistor; the first transistor is a first MOSFET, a first terminal of the first transistor is the drain of the first MOSFET, a second terminal of the first transistor is the source of the first MOSFET, and a third terminal of the first transistor is the gate of the first MOSFET; the first energy storage device is a capacitor or an inductor.

2. The battery detection circuit according to claim 1, characterized in that, The battery detection circuit further includes: a second blocking circuit, the first end of which is connected to a second energy storage device, the second end of which is connected to an external power supply bus to output the energy stored in the second energy storage device to the external power supply bus, and the third end of which is a control terminal to conduct the first and second ends of the second blocking circuit; a control module is electrically connected to the third end of the second blocking circuit to control the conduction or disconnection of the second blocking circuit.

3. The battery detection circuit according to claim 2, characterized in that, The second blocking circuit includes a second transistor. The first terminal of the second transistor is connected to the second terminal of the second energy storage device. The second terminal of the second transistor is connected to an external power supply bus to output the energy stored in the second energy storage device. The third terminal of the second transistor is a control terminal, which is used to turn on the first and second terminals of the second transistor. The control module is electrically connected to the third terminal of the second transistor to control the turn-on of the second transistor.

4. The battery detection circuit according to claim 3, characterized in that, The second transistor is a second MOS transistor. The first terminal of the second transistor is the source of the second MOS transistor, the second terminal of the second transistor is the drain of the second MOS transistor, and the third terminal of the second transistor is the gate of the third MOS transistor.

5. The battery detection circuit according to claim 1, characterized in that, The second energy storage device is a capacitor or an inductor.

6. A battery system comprising the battery detection circuit and the battery as described in any one of claims 1-5.

Images