Battery management system based on battery current detection and electronic equipment

Abstract

The utility model relates to a battery management system based on battery current detection and electronic equipment. The system comprises a first resistor which is electrically connected between a charging and discharging circuit of the system and a battery of the system; the first end of the time delay switch circuit is electrically connected with the first end of the first resistor; the first end of the current sampling circuit is electrically connected with the second end of the first resistor, the second end of the current sampling circuit is electrically connected with the second end of the time delay switch circuit, and the third end of the current sampling circuit is electrically connected with a control circuit of the system.

Description

Technical Field

[0001] This utility model relates to the technical field of batteries, and more specifically, to a battery management system and electronic device based on battery current detection. Background Technology

[0002] With the widespread use of batteries, they can be charged or discharged through charging and discharging circuits, enabling devices powered by the battery to receive electricity. In existing technology, battery current detection typically involves a current sampling circuit and a control circuit. The current sampling circuit collects the battery current and feeds it back to the control circuit, allowing the control circuit to regulate the charging and discharging circuit based on the battery current feedback. However, the current is relatively unstable during battery discharge, leading to abnormal regulation of the charging and discharging circuit by the control circuit. Utility Model Content

[0003] One objective of this invention is to provide a battery management system and electronic device based on battery current detection.

[0004] According to one aspect of the present invention, a battery management system based on battery current detection is provided, the system comprising:

[0005] A first resistor is electrically connected between the charging / discharging circuit of the system and the battery of the system.

[0006] A time-delay switch circuit, wherein the first terminal of the time-delay switch circuit is electrically connected to the first terminal of the first resistor;

[0007] A current sampling circuit, wherein the first terminal of the current sampling circuit is electrically connected to the second terminal of the first resistor, the second terminal of the current sampling circuit is electrically connected to the second terminal of the delay switch circuit, and the third terminal of the current sampling circuit is electrically connected to the control circuit of the system.

[0008] Optionally, the delay switch circuit includes a first capacitor, a second resistor, and a first switch;

[0009] Wherein, the first terminal of the first switch is electrically connected to the first terminal of the first resistor, the electrical connection point of the first terminal of the first capacitor and the first terminal of the first resistor is electrically connected to the first terminal of the first switch, the electrical connection point of the second terminal of the first capacitor and the second terminal of the first resistor is electrically connected to the second terminal of the first switch, and the third terminal of the first switch is electrically connected to the second terminal of the current sampling circuit.

[0010] Optionally, the first switch is a transistor, with the first terminal of the first switch being the collector, the second terminal of the first switch being the base, and the third terminal of the first switch being the emitter.

[0011] Optionally, the delay switch circuit further includes a third resistor, a second switch, and a diode;

[0012] Wherein, the first end of the third resistor is electrically connected to the second end of the first switch, the second end of the third resistor is electrically connected to the first end of the second switch, the second end of the second switch is grounded, the third end of the second switch is communicatively connected to the control circuit, the anode of the diode is connected to the first end of the first resistor, and the cathode of the diode is connected to the first end of the first capacitor.

[0013] Optionally, the second switch is a MOSFET, with the first terminal of the second switch being the source, the second terminal of the second switch being the drain, and the third terminal of the second switch being the gate.

[0014] Optionally, the current sampling circuit includes a first sampling circuit, a second sampling circuit, and an amplification circuit. The first terminal of the first sampling circuit is electrically connected to the second terminal of the delay switch circuit, the second terminal of the first sampling circuit is connected to the first terminal of the amplification circuit, the first terminal of the second sampling circuit is electrically connected to the second terminal of the first resistor, the second terminal of the second sampling circuit is electrically connected to the second terminal of the amplification circuit, and the third terminal of the amplification circuit is electrically connected to the control circuit of the system.

[0015] Optionally, the first sampling circuit includes a fourth resistor and a fifth resistor. The first end of the fourth resistor is electrically connected to the second end of the delay switch circuit. The first end of the fifth resistor is electrically connected to the second end of the fourth resistor. The second end of the fifth resistor is electrically connected to the third end of the amplifier circuit. The connection point between the second end of the fourth resistor and the first end of the fifth resistor is connected to the first end of the amplifier circuit.

[0016] Optionally, the second sampling circuit includes a sixth resistor and a seventh resistor. The first end of the sixth resistor is electrically connected to the second end of the first resistor, the second end of the sixth resistor is connected to the first end of the seventh resistor, the second end of the seventh resistor is grounded, and the connection point between the second end of the sixth resistor and the first end of the seventh resistor is electrically connected to the second end of the amplifier circuit.

[0017] Optionally, the amplifier circuit is an operational amplifier, the first terminal of the amplifier circuit is an inverting input terminal, the second terminal of the amplifier circuit is a non-inverting input terminal, and the third terminal of the amplifier circuit is an output terminal.

[0018] According to one aspect of the present invention, an electronic device is provided, the electronic device comprising a battery management system based on battery current detection as described in the first aspect.

[0019] One technical advantage of this invention is that the battery management system based on battery current detection can use a delayed switching circuit to delay the conduction of the current sampling circuit, so that the current sampling circuit can delay the transmission of the signal representing the battery current to the control circuit, thereby reducing the transmission of relatively unstable current to the control circuit by the current sampling circuit and effectively improving the accuracy of the control circuit in regulating the charging and discharging circuit.

[0020] Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. Attached Figure Description

[0021] The accompanying drawings, which form part of this specification, illustrate embodiments of the present invention and, together with the specification, serve to explain the principles of the present invention.

[0022] Figure 1 This is a structural block diagram of a battery management system based on battery current detection in an embodiment of this application;

[0023] Figure 2 This is a circuit diagram of a battery management system based on battery current detection in an embodiment of this application. Detailed Implementation

[0024] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0025] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0026] Technologies and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such technologies and equipment should be considered part of the specification.

[0027] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0029] Figure 1 This is a structural block diagram of a battery 20 management system based on battery 20 current detection, according to an embodiment of this application. Figure 1As shown, the system includes a first resistor R1, a time delay switch circuit 1, and a current sampling circuit 2.

[0030] The first resistor R1 is electrically connected between the system's charging and discharging circuit 30 and the system's battery 20;

[0031] The first terminal of the delay switch circuit 1 is electrically connected to the first terminal of the first resistor R1;

[0032] The first terminal of the current sampling circuit 2 is electrically connected to the second terminal of the first resistor R1, the second terminal of the current sampling circuit 2 is electrically connected to the second terminal of the delay switch circuit 1, and the third terminal of the current sampling circuit 2 is electrically connected to the system control circuit 10.

[0033] In this embodiment, the control circuit 10 can be a BMS chip, which has functions such as arithmetic processing and signal transmission and reception.

[0034] In this embodiment, the charging and discharging circuit 30 can be an existing DC-DC conversion circuit or an existing AC-DC conversion circuit, and there is no limitation here.

[0035] In other words, the battery 20 management system based on battery 20 current detection can use the delay switch circuit 1 to delay the conduction of the current sampling circuit 2, so that the current sampling circuit 2 can delay the transmission of the signal representing the current of battery 20 to the control circuit 10, thereby reducing the transmission of relatively unstable current to the control circuit 10 by the current sampling circuit 2, and effectively improving the accuracy of the control circuit 10 in regulating the charging and discharging circuit 30.

[0036] In some embodiments, to achieve delayed conduction of the current sampling circuit 2, such as Figure 2 As shown, the delay switch circuit 1 includes a first capacitor C1, a second resistor R2, and a first switch D1;

[0037] Specifically, the first terminal of the first switch D1 is electrically connected to the first terminal of the first resistor R1, the electrical connection point of the first terminal of the first capacitor C1 and the first terminal of the first resistor R1 is electrically connected to the first terminal of the first switch D1, the electrical connection point of the second terminal of the first capacitor C1 and the second terminal of the first resistor R1 is electrically connected to the second terminal of the first switch D1, and the third terminal of the first switch D1 is electrically connected to the second terminal of the current sampling circuit 2.

[0038] In some embodiments, such as Figure 2 As shown, the first switch D1 is a transistor, the first terminal of the first switch D1 is the collector, the second terminal of the first switch D1 is the base, and the third terminal of the first switch D1 is the emitter.

[0039] In other words, by setting the first capacitor C1 and the second resistor R2, when the first capacitor C1 is fully charged and then discharges, the second terminal of the first switch D1 changes from low level to high level, so that the first terminal and the third terminal of the first switch D1 are turned on, thereby realizing the delayed conduction of the current sampling circuit 2.

[0040] In some embodiments, to further improve the sampling accuracy of the current sampling circuit 2, such as Figure 2 As shown, the delay switch circuit 1 also includes a third resistor R3, a second switch Q1, and a diode D2;

[0041] Among them, the first end of the third resistor R3 is electrically connected to the second end of the first switch D1, the second end of the third resistor R3 is electrically connected to the first end of the second switch Q1, the second end of the second switch Q1 is grounded, the third end of the second switch Q1 is communicatively connected to the control circuit 10, the anode of the diode D2 is connected to the first end of the first resistor R1, and the cathode of the diode D2 is connected to the first end of the first capacitor C1.

[0042] In some embodiments, such as Figure 2 As shown, the second switch Q1 is a MOSFET, with the first terminal of the second switch Q1 being the source, the second terminal of the second switch Q1 being the drain, and the third terminal of the second switch Q1 being the gate.

[0043] In this embodiment, by setting the second switch Q1, the control circuit 10 can output a high-level signal to the base of the second switch Q1, so that the first and second terminals of the second switch Q1 are turned on, thereby realizing the sampling of the current on the first resistor R1.

[0044] In this embodiment, by setting the second switch Q1, the control circuit 10 can output a high-level signal at the second terminal of the second switch Q1, control the first and second terminals of the second switch Q1 to be turned on, so as to consume the power of the first capacitor C1, thereby ensuring the accuracy of the delay switch circuit 1 in the next current sampling.

[0045] In some embodiments, in order to acquire the current of the first resistor R1, such as Figure 2 As shown, the current sampling circuit 2 includes a first sampling circuit, a second sampling circuit, and an amplifier circuit U1. The first terminal of the first sampling circuit is electrically connected to the second terminal of the delay switch circuit 1, the second terminal of the first sampling circuit is connected to the first terminal of the amplifier circuit U1, the first terminal of the second sampling circuit is electrically connected to the second terminal of the first resistor R1, the second terminal of the second sampling circuit is electrically connected to the second terminal of the amplifier circuit U1, and the third terminal of the amplifier circuit U1 is electrically connected to the system control circuit 10.

[0046] In some embodiments, such as Figure 2As shown, the first sampling circuit includes a fourth resistor R4 and a fifth resistor R5. The first end of the fourth resistor R4 is electrically connected to the second end of the delay switch circuit 1. The first end of the fifth resistor R5 is electrically connected to the second end of the fourth resistor R4. The second end of the fifth resistor R5 is electrically connected to the third end of the amplifier circuit U1. The connection point between the second end of the fourth resistor R4 and the first end of the fifth resistor R5 is connected to the first end of the amplifier circuit U1.

[0047] In some embodiments, such as Figure 2 As shown, the second sampling circuit includes a sixth resistor R6 and a seventh resistor. The first end of the sixth resistor R6 is electrically connected to the second end of the first resistor R1. The second end of the sixth resistor R6 is connected to the first end of the seventh resistor. The second end of the seventh resistor is grounded. The connection point between the second end of the sixth resistor R6 and the first end of the seventh resistor is electrically connected to the second end of the amplifier circuit U1.

[0048] In some embodiments, in order to amplify the current of the first resistor R1, such as... Figure 2 As shown, amplifier circuit U1 is an operational amplifier. The first terminal of amplifier circuit U1 is the inverting input terminal, the second terminal of amplifier circuit U1 is the non-inverting input terminal, and the third terminal of amplifier circuit U1 is the output terminal.

[0049] In some examples, when the control circuit 10 receives a signal representing the battery current, it can calculate the change in charge and control the conversion efficiency of the charging and discharging circuit based on the change in charge. It feeds back a PWM wave signal that matches the conversion efficiency of the battery to the charging and discharging circuit, so that the charging and discharging circuit adjusts the conversion efficiency in response to the PWM wave signal.

[0050] An electronic device according to an embodiment of this application includes a battery management system based on battery current detection as described in any of the above embodiments.

[0051] While specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A battery management system based on battery current detection, characterized in that, The system includes: A first resistor is electrically connected between the charging / discharging circuit of the system and the battery of the system. A time-delay switch circuit, wherein the first terminal of the time-delay switch circuit is electrically connected to the first terminal of the first resistor; A current sampling circuit, wherein a first terminal of the current sampling circuit is electrically connected to a second terminal of the first resistor, a second terminal of the current sampling circuit is electrically connected to a second terminal of the time-delay switch circuit, and a third terminal of the current sampling circuit is electrically connected to the control circuit of the system; the time-delay switch circuit includes a first capacitor, a second resistor, and a first switch; Wherein, the first terminal of the first switch is electrically connected to the first terminal of the first resistor, the electrical connection point of the first terminal of the first capacitor and the first terminal of the first resistor is electrically connected to the first terminal of the first switch, the electrical connection point of the second terminal of the first capacitor and the second terminal of the first resistor is electrically connected to the second terminal of the first switch, and the third terminal of the first switch is electrically connected to the second terminal of the current sampling circuit; the delay switch circuit also includes a third resistor, a second switch and a diode; Wherein, the first end of the third resistor is electrically connected to the second end of the first switch, the second end of the third resistor is electrically connected to the first end of the second switch, the second end of the second switch is grounded, the third end of the second switch is communicatively connected to the control circuit, the anode of the diode is connected to the first end of the first resistor, and the cathode of the diode is connected to the first end of the first capacitor.

2. The system according to claim 1, characterized in that, The first switch is a transistor, with its first terminal being the collector, its second terminal being the base, and its third terminal being the emitter.

3. The system according to claim 1, characterized in that, The second switch is a MOSFET, with its first terminal being the source, its second terminal being the drain, and its third terminal being the gate.

4. The system according to claim 1, characterized in that, The current sampling circuit includes a first sampling circuit, a second sampling circuit, and an amplification circuit. The first terminal of the first sampling circuit is electrically connected to the second terminal of the delay switch circuit, the second terminal of the first sampling circuit is connected to the first terminal of the amplification circuit, the first terminal of the second sampling circuit is electrically connected to the second terminal of the first resistor, the second terminal of the second sampling circuit is electrically connected to the second terminal of the amplification circuit, and the third terminal of the amplification circuit is electrically connected to the control circuit of the system.

5. The system according to claim 4, characterized in that, The first sampling circuit includes a fourth resistor and a fifth resistor. The first end of the fourth resistor is electrically connected to the second end of the delay switch circuit. The first end of the fifth resistor is electrically connected to the second end of the fourth resistor. The second end of the fifth resistor is electrically connected to the third end of the amplifier circuit. The connection point between the second end of the fourth resistor and the first end of the fifth resistor is connected to the first end of the amplifier circuit.

6. The system according to claim 4, characterized in that, The second sampling circuit includes a sixth resistor and a seventh resistor. The first end of the sixth resistor is electrically connected to the second end of the first resistor, the second end of the sixth resistor is connected to the first end of the seventh resistor, the second end of the seventh resistor is grounded, and the connection point between the second end of the sixth resistor and the first end of the seventh resistor is electrically connected to the second end of the amplifier circuit.

7. The system according to claim 4, characterized in that, The amplifier circuit is an operational amplifier, with its first terminal being an inverting input terminal, its second terminal being a non-inverting input terminal, and its third terminal being an output terminal.

8. An electronic device, characterized in that, The electronic device includes a battery management system based on battery current detection as described in any one of claims 1 to 7.

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