Battery management circuit, power supply and electronic equipment

Abstract

The utility model provides a battery management circuit, a power supply and electronic equipment. The battery management circuit comprises a protection chip module and a trigger module, the negative voltage input pin of the protection chip module is connected with the first end of the trigger module, and the second end of the trigger module is connected with the positive electrode of the target battery. The trigger module is arranged to transmit the positive voltage of the target battery to the negative voltage input pin of the protection chip module when the battery needs to be turned off, compared with the scheme that a turn-off circuit is additionally arranged in the prior art, turn-off of the target battery is achieved based on the under-voltage protection function of a protection chip, the number of devices is reduced, and the cost is reduced. And the implementation cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of transportation safety, and in particular to a battery management circuit, a power supply and an electronic device. Background Art

[0002] In the prior art, when transporting batteries, it is usually necessary to set up an additional shutdown circuit to control the batteries to remain shut down during transportation, thereby reducing safety hazards; and this method of setting up a shutdown circuit requires adding more components, thereby increasing product costs, and for batteries without a shutdown circuit, it is difficult to achieve shutdown during transportation, resulting in safety hazards during transportation. Utility Model Content

[0003] The main purpose of the utility model is to provide a battery management circuit, a power supply and an electronic device, aiming to solve the problem of high cost of realizing battery shutdown in the prior art.

[0004] In order to achieve the above object, the utility model provides a battery management circuit.

[0005] The battery management circuit is connected to the target battery; the battery management circuit includes a protection chip module and a trigger module; the negative voltage input pin of the protection chip module is connected to the first end of the trigger module, and the second end of the trigger module is connected to the positive electrode of the target battery; wherein:

[0006] The trigger module is used to connect the negative voltage input pin of the protection chip module and the positive electrode of the target battery when in a trigger state, and disconnect the negative voltage input pin of the protection chip module and the positive electrode of the target battery when in a shutdown state;

[0007] The protection chip module is used to trigger undervoltage protection when the trigger module is in a trigger state.

[0008] Optionally, the trigger module includes a trigger unit and a first switch unit, wherein:

[0009] The output end of the trigger unit is connected to the control end of the first switch unit, and the first switch unit is connected between the negative voltage input pin of the protection chip module and the positive electrode of the target battery.

[0010] Optionally, the first switch unit includes a first resistor, a second resistor and a first MOS tube; wherein:

[0011] The gate of the first MOS tube is connected to the output end of the trigger unit, the drain of the first MOS tube is connected to the positive electrode of the target battery through the first resistor, and the source of the first MOS tube is connected to the negative voltage input pin of the protection chip module through the second resistor.

[0012] Optionally, the protection chip module includes a battery protection chip, a second switch unit, a third resistor and a fourth resistor; the power supply pin VDD of the battery protection chip is connected to the positive electrode of the target battery through the fourth resistor, the negative voltage input pin of the battery protection chip is connected to the positive electrode of the target battery through the trigger module, and the negative voltage input pin of the battery protection chip is also connected to the output ground terminal through the third resistor; the control terminal of the second switch unit is connected to the output terminal of the battery protection chip, and the second switch unit is connected between the negative electrode of the target battery and the output ground terminal; wherein:

[0013] The battery protection chip is used to trigger undervoltage protection when the negative voltage input pin is connected to the positive electrode of the target battery, and send a shutdown signal to the second switch unit when the undervoltage protection is triggered;

[0014] The second switch unit is used to disconnect the negative electrode of the target battery from the output ground terminal after receiving the shutdown signal.

[0015] Optionally, the second switch unit includes a second MOS transistor and a third MOS transistor, wherein:

[0016] The gate of the second MOS tube is connected to the first output end of the battery protection chip, the source of the second MOS tube is connected to the negative electrode of the target battery, the drain of the second MOS tube is connected to the drain of the third MOS tube, the source of the third MOS tube is connected to the output ground end, and the control end of the third MOS tube is connected to the second output end of the battery protection chip.

[0017] Optionally, the protection chip module further includes a temperature detection module, and the temperature detection module includes a temperature-sensitive resistor; wherein:

[0018] The temperature detection pin of the battery protection chip is grounded through the temperature sensitive resistor.

[0019] Optionally, the battery management circuit further includes a main circuit management module; the main circuit management module is connected between the positive electrode of the battery and the output positive terminal.

[0020] Optionally, the main path management module includes a power management chip, a fourth MOS tube and a first capacitor; wherein:

[0021] The output end of the power management chip is connected to the control end of the fourth MOS tube, the fourth MOS tube is connected between the positive electrode of the battery and the output positive end, and the first capacitor is connected between the output positive end and the output ground end.

[0022] In addition, to achieve the above-mentioned purpose, the utility model also provides a power supply, which includes a target battery and a battery management circuit, and the battery management circuit is configured as the battery management circuit described above.

[0023] In addition, to achieve the above-mentioned purpose, the utility model also provides an electronic device, wherein the electronic device comprises the power supply as described above.

[0024] The utility model proposes a battery management circuit, power supply and electronic device, wherein the battery management circuit is connected to a target battery; the battery management circuit includes a protection chip module and a trigger module; the negative voltage input pin of the protection chip module is connected to the first end of the trigger module, and the second end of the trigger module is connected to the positive electrode of the target battery; wherein: the trigger module is used to conduct the negative voltage input pin of the protection chip module and the positive electrode of the target battery when in a trigger state, and disconnect the negative voltage input pin of the protection chip module and the positive electrode of the target battery when in a shutdown state; the protection chip module is used to trigger undervoltage protection when the trigger module is in a trigger state. By setting the trigger module to transmit the positive voltage of the target battery to the negative voltage input pin of the protection chip module when the battery needs to be shut down, compared with the solution of setting an additional shutdown circuit in the prior art, the shutdown of the target battery is achieved based on the undervoltage protection function of the protection chip itself, which reduces the increase of devices and reduces the implementation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0026] Figure 1 This is a functional module diagram of an embodiment of a battery management circuit of the present utility model.

[0027] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings.

[0028] Description of Figure Numbers:

[0029]

[0030] DETAILED DESCRIPTION

[0031] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0034] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0035] The utility model provides a battery management circuit, which is applied to power supply, see Figure 1 , Figure 1 This is a functional module diagram of an embodiment of the battery management circuit of the utility model. In this embodiment, the battery management circuit is connected to the target battery B1; the battery management circuit includes a protection chip module 100 and a trigger module 200; the negative voltage input pin of the protection chip module 100 is connected to the first end of the trigger module 200, and the second end of the trigger module 200 is connected to the positive electrode of the target battery B1; wherein:

[0036] The trigger module 200 is used to connect the negative voltage input pin of the protection chip module 100 and the positive electrode of the target battery B1 when it is in the trigger state, and disconnect the negative voltage input pin of the protection chip module 100 and the positive electrode of the target battery B1 when it is in the shutdown state; the protection chip module 100 is used to trigger undervoltage protection when the trigger module is in the trigger state.

[0037] The protection chip module 100 includes a battery protection chip U1 ; the specific type of the battery protection chip U1 can be selected based on actual needs, but in order to realize the functions in the present application, the battery protection chip U1 needs to have at least an undervoltage protection function.

[0038] The trigger module 200 is used to trigger the undervoltage protection function of the battery protection chip U1; it can be understood that the battery protection chip U1 uses the negative voltage input pin as the low voltage standard. At the same time, the power supply pin VDD of the battery protection chip U1 is powered by the battery. The battery protection chip U1 judges the voltage state of the battery by comparing the power supply pin VDD and the negative voltage input pin. When the negative voltage input pin is short-circuited with the positive pole of the target battery B1, the negative voltage input pin is connected to the positive pole voltage of the target battery B1. The battery protection chip U1 believes that the voltage output by the target battery B1 is consistent with the low voltage. Therefore, it is considered that the target battery B1 is in an undervoltage state at this time, thereby triggering the undervoltage protection of the battery protection chip U1.

[0039] Specifically, the switching mode between the trigger state and the shutdown state of the trigger module 200 can be set based on actual needs, such as external test equipment, setting a trigger switch, etc.; in normal use, the trigger module 200 is in the shutdown state, at which time, the battery protection chip U1 does not trigger the undervoltage protection; when the target battery B1 needs to be shut down, the state of the trigger module 200 is switched to the trigger state based on the specific trigger mode, thereby triggering the undervoltage protection. It can be understood that when the battery protection chip U1 performs undervoltage protection on the target battery B1, the target battery B1 is in the shutdown state.

[0040] It is understandable that the trigger module 200 in this embodiment does not have a shutdown function itself, but is used to trigger the undervoltage protection of the battery protection chip U1.

[0041] In this embodiment, a trigger module 200 is provided to transmit the positive voltage of the target battery to the negative voltage input pin of the protection chip module when the battery needs to be shut down. Compared with the solution of additionally providing a shutdown circuit in the prior art, the shutdown of the target battery is achieved based on the undervoltage protection function of the protection chip itself, which reduces the increase in devices and reduces the implementation cost.

[0042] Furthermore, the trigger module 200 includes a trigger unit U2 and a first switch unit S1, wherein:

[0043] The output end of the trigger unit U2 is connected to the control end of the first switch unit S1 , and the first switch unit S1 is connected between the negative voltage input pin of the protection chip module 100 and the positive electrode of the target battery B1 .

[0044] The trigger unit U2 is used to set the state of the first switch unit S1; the user can set the on and off of the first switch tube through the trigger unit U2; the specific structure of the trigger unit U2 can be set based on actual needs, such as a signal interface, an interactive processing device, etc.

[0045] The first switch unit S1 is used to open or close the connection between the negative voltage input pin of the protection chip module 100 and the positive electrode of the target battery B1.

[0046] When the first switch unit S1 is disconnected, the negative voltage input pin of the protection chip module 100 is not connected to the positive electrode of the target battery B1, and the protection chip module 100 does not trigger the undervoltage protection;

[0047] When the first switch unit S1 is turned on, the negative voltage input pin of the protection chip module 100 is connected to the positive electrode of the target battery B1, and the protection chip module 100 triggers undervoltage protection.

[0048] Furthermore, the first switch unit S1 includes a first resistor R1, a second resistor R2 and a first MOS transistor; wherein:

[0049] The gate of the first MOS tube is connected to the output end of the trigger unit U2, the drain of the first MOS tube is connected to the positive electrode of the target battery B1 through the first resistor R1, and the source of the first MOS tube is connected to the negative voltage input pin of the protection chip module 100 through the second resistor R2.

[0050] In this embodiment, the first MOS transistor is an NMOS. When the gate of the first MOS transistor is at a low level, the first MOS transistor is turned off. At this time, the negative voltage input pin of the protection chip module 100 is disconnected from the positive electrode of the target battery B1, and the undervoltage protection is not triggered.

[0051] When the gate of the first MOS tube is at a high level, the first MOS tube is turned on. At this time, the negative voltage input pin of the protection chip module 100 is short-circuited with the positive electrode of the target battery B1, triggering the undervoltage protection.

[0052] It should be noted that the first MOS tube may also be replaced by other switch devices, such as an electronic switch.

[0053] Further, the protection chip module 100 includes a battery protection chip U1, a second switch unit, a third resistor R3 and a fourth resistor R4; the power supply pin VDD of the battery protection chip U1 is connected to the positive electrode of the target battery B1 through the fourth resistor R4, the negative voltage input pin of the battery protection chip U1 is connected to the positive electrode of the target battery B1 through the trigger module 200, and the negative voltage input pin of the battery protection chip U1 is also connected to the output ground through the third resistor R3; the control end of the second switch unit is connected to the output end of the battery protection chip U1, and the second switch unit is connected between the negative electrode of the target battery B1 and the output ground; wherein:

[0054] The battery protection chip U1 is used to trigger undervoltage protection when the negative voltage input pin is connected to the positive electrode of the target battery B1, and send a shutdown signal to the second switch unit when the undervoltage protection is triggered;

[0055] The second switch unit is used to disconnect the negative electrode of the target battery B1 from the output ground after receiving the shutdown signal.

[0056] The negative voltage input pin of the battery protection chip U1 is grounded through the third resistor R3; in this embodiment, the negative voltage input pin of the battery protection chip U1 is the negative voltage input pin VM. When the negative voltage input pin of the battery protection chip U1 is not connected to the positive electrode of the target battery B1, the negative voltage input pin of the battery protection chip U1 is grounded. At this time, the battery protection chip U1 takes zero potential as the low voltage; and when the negative voltage input pin of the battery protection chip U1 is short-circuited with the positive electrode of the target battery B1, the voltage of the target battery B1 is transmitted to the battery protection chip U1. At this time, the battery protection chip U1 takes the actual voltage of the negative voltage input pin as the low voltage.

[0057] The battery protection chip U1 determines the voltage state of the target battery B1 by comparing the voltage of the power supply pin VDD with the voltage of the negative voltage input pin; when the negative voltage input pin of the target battery B1 is grounded, the target battery B1 is at zero potential as a low voltage, and the target battery B1 operates normally; when the positive voltage of the target battery B1 is transmitted to the negative voltage input pin of the battery protection chip U1, the voltage transmitted from the positive voltage to the negative voltage input pin by the battery protection chip U1 is a low voltage, therefore, the target battery B1 is considered to be in a low voltage state, triggering low voltage protection.

[0058] When the low voltage protection is triggered, the battery protection chip U1 sends a shutdown signal to the second switch unit. After receiving the shutdown signal, the second switch unit disconnects the connection between the negative pole of the battery and the output ground terminal. It can be understood that the target battery B1 is connected to an external electrical appliance or a charger through the output positive terminal and the output ground terminal. When the negative pole of the target battery B1 is disconnected from the output ground terminal, the battery is in a shutdown state because the current loop is disconnected.

[0059] Furthermore, the second switch unit includes a second MOS transistor Q2 and a third MOS transistor Q3, wherein:

[0060] The gate of the second MOS tube Q2 is connected to the first output end of the battery protection chip U1, the source of the second MOS tube Q2 is connected to the negative electrode of the target battery B1, the drain of the second MOS tube Q2 is connected to the drain of the third MOS tube Q3, the source of the third MOS tube Q3 is connected to the output ground end, and the control end of the third MOS tube Q3 is connected to the second output end of the battery protection chip U1.

[0061] In this embodiment, the second MOS tube Q2 and the third MOS tube Q3 are NMOS tubes; when the battery protection chip U1 does not trigger the undervoltage protection, a high level is output to the gate of the second MOS tube Q2 and the gate of the third MOS tube Q3. At this time, the second MOS tube Q2 and the third MOS tube Q3 are turned on, and the negative electrode of the target battery B1 is connected to the output ground terminal; when the battery protection chip U1 triggers the undervoltage protection, a low level is output to the gate of the second MOS tube Q2 and the gate of the third MOS tube Q3. At this time, the second MOS tube Q2 and the third MOS tube Q3 are turned off, and the negative electrode of the target battery B1 is disconnected from the output ground terminal.

[0062] Furthermore, the protection chip module 100 further includes a temperature detection module, and the temperature detection module includes a temperature-sensitive resistor RT; wherein:

[0063] The temperature detection pin of the battery protection chip U1 is grounded through the thermistor RT.

[0064] In this embodiment, a temperature detection module is provided to control the temperature of the target battery B1; in terms of spatial setting, the thermistor RT is arranged to fit the target battery B1, so as to collect the temperature of the battery. The resistance value of the thermistor RT changes with temperature. The battery protection chip U1 determines the temperature of the target battery B1 according to the resistance value of the thermistor RT. The type of the thermistor RT can be set based on actual needs, such as a negative temperature coefficient thermistor RTNTC.

[0065] Furthermore, the battery management circuit further includes a main circuit management module 300; the main circuit management module 300 is connected between the positive electrode of the battery and the output positive terminal.

[0066] The main circuit management module 300 is used to manage the charging and discharging of the target battery B1.

[0067] Furthermore, the main path management module 300 includes a power management chip U3, a fourth MOS tube Q4 and a first capacitor C1; wherein:

[0068] The output end of the power management chip U3 is connected to the control end of the fourth MOS transistor Q4, the fourth MOS transistor Q4 is connected between the positive electrode of the battery and the output positive end, and the first capacitor C1 is connected between the output positive end and the output ground end.

[0069] The specific type of the power management chip U3 can be selected based on actual needs.

[0070] The power management chip U3 controls the charging and discharging of the target battery B1 by controlling the fourth MOS tube Q4; the specific control method can be set based on actual needs.

[0071] The first capacitor C1 is a bus capacitor.

[0072] The overall principle of the battery management circuit of this application is explained below:

[0073] When the target battery B1 does not need to be shut down, the trigger unit U2 outputs a low-level signal to the first MOS tube, the first MOS tube is shut down, the negative voltage input pin of the battery protection chip U1 is grounded through the third resistor R3, the battery protection chip U1 does not trigger the undervoltage protection, the second MOS tube Q2 and the third MOS tube Q3 are turned on, and the target battery B1 operates normally.

[0074] When the target battery B1 needs to be turned off, the trigger unit U2 outputs a high-level signal to the first MOS tube, the first MOS tube is turned on, the positive electrode of the target battery B1 is short-circuited with the negative voltage input pin of the battery protection chip U1, and the positive electrode voltage of the target battery B1 is transmitted to the negative voltage input pin of the battery protection chip U1 through the first resistor R1 and the second resistor R2. The battery protection chip U1 triggers undervoltage protection and sends a shutdown signal to the second MMOS tube and the third MOS tube Q3. The second MOS tube Q2 and the third MOS tube Q3 are turned off, and the target battery B1 is turned off.

[0075] The utility model also protects a power supply, which includes a target battery and a battery management circuit. The structure of the battery management circuit can refer to the above embodiment and will not be described in detail here. As a matter of course, since the power supply of this embodiment adopts the technical solution of the above battery management circuit, the power supply has all the beneficial effects of the above battery management circuit.

[0076] The utility model also protects an electronic device, which includes a power supply. The structure of the power supply can refer to the above embodiment and will not be repeated here. As a matter of course, since the electronic device of this embodiment adopts the technical solution of the above power supply, the electronic device has all the beneficial effects of the above power supply.

[0077] It should be noted that, in this article, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the presence of other identical elements in the process, method, article or system including the element. The serial numbers of the above-mentioned embodiments of the utility model are for description only and do not represent the advantages and disadvantages of the embodiments.

[0078] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A battery management circuit, characterized in that: The battery management circuit is connected to the target battery; the battery management circuit includes a protection chip module and a trigger module; the negative voltage input pin of the protection chip module is connected to the first end of the trigger module, and the second end of the trigger module is connected to the positive electrode of the target battery; wherein: The trigger module is used to connect the negative voltage input pin of the protection chip module and the positive electrode of the target battery when it is in the trigger state, and disconnect the negative voltage input pin of the protection chip module and the positive electrode of the target battery when it is in the shutdown state; the protection chip module is used to trigger undervoltage protection when the trigger module is in the trigger state.

2. The battery management circuit according to claim 1, characterized in that: The trigger module includes a trigger unit and a first switch unit, wherein: The output end of the trigger unit is connected to the control end of the first switch unit, and the first switch unit is connected between the negative voltage input pin of the protection chip module and the positive electrode of the target battery.

3. The battery management circuit according to claim 2, characterized in that: The first switch unit includes a first resistor, a second resistor and a first MOS tube; wherein: The gate of the first MOS tube is connected to the output end of the trigger unit, the drain of the first MOS tube is connected to the positive electrode of the target battery through the first resistor, and the source of the first MOS tube is connected to the negative voltage input pin of the protection chip module through the second resistor.

4. The battery management circuit according to claim 1, characterized in that: The protection chip module includes a battery protection chip, a second switch unit, a third resistor and a fourth resistor; the power supply pin of the battery protection chip is connected to the positive electrode of the target battery through the fourth resistor, the negative voltage input pin of the battery protection chip is connected to the positive electrode of the target battery through the trigger module, and the negative voltage input pin of the battery protection chip is also connected to the output ground terminal through the third resistor; the control terminal of the second switch unit is connected to the output terminal of the battery protection chip, and the second switch unit is connected between the negative electrode of the target battery and the output ground terminal; wherein: The battery protection chip is used to trigger undervoltage protection when the negative voltage input pin is connected to the positive electrode of the target battery, and send a shutdown signal to the second switch unit when the undervoltage protection is triggered; The second switch unit is used to disconnect the negative electrode of the target battery from the output ground terminal after receiving the shutdown signal.

5. The battery management circuit according to claim 4, characterized in that: The second switch unit includes a second MOS tube and a third MOS tube, wherein: The gate of the second MOS tube is connected to the first output end of the battery protection chip, the source of the second MOS tube is connected to the negative electrode of the target battery, the drain of the second MOS tube is connected to the drain of the third MOS tube, the source of the third MOS tube is connected to the output ground end, and the control end of the third MOS tube is connected to the second output end of the battery protection chip.

6. The battery management circuit according to claim 4, characterized in that: The protection chip module also includes a temperature detection module, and the temperature detection module includes a temperature-sensitive resistor; wherein: The temperature detection pin of the battery protection chip is grounded through the temperature sensitive resistor.

7. The battery management circuit according to claim 1, characterized in that: The battery management circuit also includes a main circuit management module; the main circuit management module is connected between the positive electrode of the battery and the output positive terminal.

8. The battery management circuit according to claim 7, characterized in that: The main path management module includes a power management chip, a fourth MOS tube and a first capacitor; wherein: The output end of the power management chip is connected to the control end of the fourth MOS tube, the fourth MOS tube is connected between the positive electrode of the battery and the output positive end, and the first capacitor is connected between the output positive end and the output ground end.

9. A power supply, characterized in that: The power source comprises a target battery and a battery management circuit according to any one of claims 1 to 8.

10. An electronic device, characterized in that: The electronic device comprises the power supply according to claim 9.

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