Battery management circuit, chip and electronic equipment

Abstract

The embodiment of the utility model provides a battery management circuit, a chip and electronic equipment, the battery management circuit comprises a battery pack, a voltage measurement selection module and a single-string voltameter, the voltage measurement selection module is connected with the positive electrode of each battery cell, so that the single-string voltameter can measure the positive electrode voltage of each battery cell, and the battery pack is connected with the single-string voltameter. The single-string voltameter can obtain the voltage of the single battery cell through simple calculation according to the positive electrode voltage of each battery cell, so that the voltage of each battery cell in a plurality of serially connected battery cells can be measured through the single-string voltameter, and the problem that the single-string voltameter cannot measure the voltage of each battery in a plurality of serially connected batteries is solved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery management circuit, chip, and electronic device. Background Art

[0002] In battery management systems, battery voltage is often measured using a fuel gauge. Fuel gauges are categorized into single-string and multi-string types. A single-string gauge measures the voltage of a single cell, while a multi-string gauge measures the voltage of each cell in a series of connected batteries.

[0003] Therefore, a single-string fuel gauge cannot be used to measure the voltage of each battery in multiple series-connected batteries. Utility Model Content

[0004] In view of the above problems, the embodiments of the present application provide a battery management circuit, chip and electronic device to solve the above technical problems.

[0005] In the first aspect, an embodiment of the present application provides a battery management circuit, which includes a battery pack, a voltage measurement selection module and a single-string fuel meter. The battery pack includes multiple battery cells connected in series; the voltage measurement selection module is connected to the positive pole of each battery cell; the single-string fuel meter is connected to the voltage measurement selection module, and the single-string fuel meter obtains the voltage of a single battery cell based on the difference between the positive pole voltages of two adjacent battery cells.

[0006] In a second aspect, an embodiment of the present application further provides a chip comprising the above-mentioned battery management circuit.

[0007] In a third aspect, an embodiment of the present application further provides an electronic device, which includes a device body and the above-mentioned chip or battery management circuit provided in the device body.

[0008] The battery management circuit, chip and electronic device provided in the embodiments of the present application connect the positive electrode of each battery cell through a voltage measurement selection module, so that a single-string fuel meter can measure the positive electrode voltage of each battery cell. The single-string fuel meter can obtain the voltage of each battery cell through a simple calculation based on the positive electrode voltage of each battery cell. In this way, the voltage of each battery cell in multiple series-connected battery cells can be measured by a single-string fuel meter, thereby solving the problem that a single-string fuel meter cannot measure the voltage of each battery in multiple series-connected batteries.

[0009] Compared with multi-string fuel gauges, a single-string fuel gauge is less expensive, thus reducing the cost of the battery management circuit.

[0010] These and other aspects of the present application will become more readily apparent from the description of the following embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0012] Figure 1 A first principle block diagram of a battery management circuit provided in an embodiment of the present application is shown.

[0013] Figure 2 Shows the principle block diagram of the voltage measurement selection module.

[0014] Figure 3 A first circuit principle diagram of the first voltage regulating unit is shown.

[0015] Figure 4 A second circuit principle diagram of the first voltage regulating unit is shown.

[0016] Figure 5 shows a circuit diagram of the switching unit.

[0017] Figure 6 FIG. 4 shows a circuit schematic diagram of the second voltage regulating unit.

[0018] Figure 7 A second principle block diagram of the battery management circuit provided in an embodiment of the present application is shown.

[0019] Figure 8 Shows the principle block diagram of the voltage processing module.

[0020] Figure 9 shows the circuit schematic diagram of the voltage divider unit.

[0021] Figure 10 A circuit schematic diagram of a battery management circuit provided in an embodiment of the present application is shown.

[0022] Figure 11 The figure shows the structure of the chip provided in the embodiment of the present application.

[0023] Figure 12 The figure shows a structural diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0024] The embodiments of the present application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0025] In order to enable those skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0026] In the embodiments of the present application, it should be noted that, in this document, relational terms such as first and second, etc., are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0027] Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0028] In the description of the embodiments of this application, words such as "example" or "for example" are used to indicate an example, illustration, or description. Any embodiment or design described as "for example" or "for example" in the embodiments of this application is not to be construed as being preferred or having more advantages than another embodiment or design. The use of words such as "example" or "for example" is intended to clearly present relative concepts.

[0029] In addition, in the embodiments of the present application, "plurality" refers to two or more. In view of this, in the embodiments of the present application, "plurality" can also be understood as "at least two". "At least one" can be understood as one or more, for example, one, two, or more. For example, "including at least one" means including one, two, or more, and does not limit which ones are included. For example, "including at least one of A, B, and C" means including A, B, C, A and B, A and C, B and C, or A, B, and C.

[0030] It should be noted that in the embodiments of the present application, "and / or" describes the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / ", unless otherwise specified, generally indicates that the associated objects are in an "or" relationship.

[0031] It should be noted that in the embodiments of the present application, "connection" can be understood as electrical connection, and the connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be either a direct connection between A and B or an indirect connection between A and B through one or more other electrical components.

[0032] The first electrode / first end of each transistor used in the embodiments of the present application is one of the source and the drain, and the second electrode / second end of each transistor is the other of the source and the drain. Since the source and drain of the transistor can be symmetrical in structure, the source and drain can be structurally indistinguishable, that is, the first electrode / first end and the second electrode / second end of the transistor in the embodiments of the present application can be structurally indistinguishable. For example, when the transistor is a P-type transistor, the first electrode / first end of the transistor is the source, and the second electrode / second end is the drain; for example, when the transistor is an N-type transistor, the first electrode / first end of the transistor is the drain, and the second electrode / second end is the source.

[0033] In the circuit structure provided in the embodiments of the present application, the first node, the second node and other nodes do not represent actual components, but represent the junction points of related couplings in the circuit diagram. That is, these nodes are nodes formed by the equivalent junction points of related couplings in the circuit diagram.

[0034] Figure 1 A first principle block diagram of a battery management circuit 100 provided in an embodiment of the present application is shown. The battery management circuit 100 includes a battery pack 10, a voltage measurement selection module 20, and a single-string fuel gauge 30. The positive electrode of each battery cell is connected via the voltage measurement selection module 20, so that the single-string fuel gauge 30 can measure the positive electrode voltage of each battery cell. The single-string fuel gauge 30 can obtain the voltage of each battery cell through a simple calculation based on the positive electrode voltage of each battery cell. In this way, the single-string fuel gauge 30 can measure the voltage of each battery cell in a plurality of series-connected batteries, thereby resolving the problem that the single-string fuel gauge 30 cannot measure the voltage of each battery cell in a plurality of series-connected batteries.

[0035] The present application embodiment provides a battery management circuit 100. Figures 1 to 10 ,like Figure 1 As shown, the battery management circuit 100 includes a battery pack 10, a voltage measurement selection module 20, and a single-string fuel gauge 30. The battery pack 10 includes multiple battery cells connected in series. The voltage measurement selection module 20 is connected to the positive terminal of each battery cell. The single-string fuel gauge 30 is connected to the voltage measurement selection module 20. The single-string fuel gauge 30 derives the voltage of a single battery cell based on the difference between the positive terminal voltages of two adjacent battery cells.

[0036] It can be understood that the battery management circuit 100 provided in the embodiment of the present application is connected to the positive pole of each battery cell through the voltage measurement selection module 20, so that the single-string fuel meter 30 can measure the positive pole voltage of each battery cell. The single-string fuel meter 30 can obtain the voltage of each battery cell through a simple calculation based on the positive pole voltage of each battery cell. In this way, the voltage of each battery cell in multiple series-connected battery cells can be measured by the single-string fuel meter 30, thereby solving the problem that the single-string fuel meter 30 cannot measure the voltage of each battery in multiple series-connected batteries.

[0037] Compared with the multi-string fuel meter, the single-string fuel meter 30 has a lower cost, thus also reducing the cost of the battery management circuit 100 .

[0038] It should be noted that the multiple battery cells connected in series may include a first battery cell BT1, a second battery cell BT2, a third battery cell BT3... and at least two of the Nth battery cell BTN. The voltage of a battery cell refers to the difference between the positive voltage of the battery cell and the negative voltage of the battery cell. The single-string fuel gauge 30 can determine the difference between the positive voltage of the second battery cell BT2 and the positive voltage of the first battery cell BT1 as the voltage of the second battery cell BT2, and determine the difference between the positive voltage of the third battery cell BT3 and the positive voltage of the second battery cell BT2 as the voltage of the third battery cell BT3... and so on, and the voltage of each battery cell can be obtained.

[0039] Alternatively, as Figure 2 As shown, the voltage measurement selection module 20 includes a switching unit 22, multiple first voltage adjustment units 21 and a second voltage adjustment unit 23. The switching unit 22 includes multiple input terminals and an output terminal; each first voltage adjustment unit 21 is connected between an input terminal of the switching unit 22 and the positive pole of a battery cell; one end of the second voltage adjustment unit 23 is connected to the output terminal of the switching unit 22 and the voltage sampling pin BAT_SNS of the single-string fuel meter 30, and the other end of the second voltage adjustment unit 23 is connected to the battery pack 10 and the ground terminal GND.

[0040] It should be noted that the switching unit 22 can select which input end its output end is connected to to obtain the positive voltage of the corresponding battery cell. Each switch of the switching unit 22 can obtain the positive voltage of a battery cell. After multiple rounds of switching, the positive voltage of each battery cell can be obtained.

[0041] The second voltage regulating unit 23 can form a voltage divider circuit with each first voltage regulating unit 21, which can output the positive voltage of the corresponding battery cell to the voltage sampling pin BAT_SNS of the single-string fuel meter 30 after voltage division to adapt to the voltage range that the voltage sampling pin BAT_SNS can withstand.

[0042] Due to the switching of the switching unit 22 , a second voltage regulating unit 23 can form different voltage dividing circuits with different first voltage regulating units 21 , thereby reducing the number of second voltage regulating units 23 used, thereby reducing costs and occupied area.

[0043] Alternatively, as Figure 3 As shown, each first voltage regulating unit 21 includes a first resistor RX, one end of the first resistor RX is connected to an input end of the switching unit 22, and the other end of the first resistor RX is connected to the positive electrode of a battery cell; wherein the first resistor RX is connected to the second voltage regulating unit 23 through the switching unit 22, so as to divide the positive electrode voltage of each battery cell into the voltage of a single battery cell.

[0044] It should be noted that the first resistor RX can form a voltage divider circuit with the second voltage regulating unit 23, so that the voltage sampling pin BAT_SNS can always sense the voltage of a single battery cell, and then the sensed voltage of the single battery cell is multiplied by the inverse of the voltage divider coefficient in the single-string fuel meter 30 to obtain the true positive voltage of each battery cell, and then the voltage of the single battery cell is obtained by the difference between the positive voltages of two adjacent battery cells.

[0045] Alternatively, as Figure 4 As shown, the multiple battery cells include the first battery cell to the Nth battery cell, and the first battery cell to the Nth battery cell are sequentially connected in series from the ground terminal GND to the positive electrode PACK+ of the battery pack 10, where N is an integer greater than or equal to 2; wherein the resistance value of the first resistor RX connected to the positive electrode of the Nth battery cell is greater than the resistance value of the first resistor RX connected to the positive electrode of the N-1th battery cell.

[0046] It should be noted that each of resistors R1, R2, R3, ..., and RN can be considered a first resistor RX. For example, the resistance of resistor R1 can be 0M, that is, resistor R1 can be omitted or a resistor with a resistance of 0 can be selected. The resistance of resistor R2 can be 1M, the resistance of resistor R3 can be 2M, and the resistance of resistor RN can be (N-1)*M, where M is a unit resistance greater than 0.

[0047] Alternatively, as Figure 5 As shown, the switching unit 22 includes a multi-way selection switch SW, each input end of the multi-way selection switch SW is connected to one end of a first resistor RX, and the output end of the multi-way selection switch SW is connected to one end of the second voltage regulation unit 23 and the voltage sampling pin BAT_SNS of the single string electricity meter 30.

[0048] It should be noted that the multi-way selection switch SW can select its output end to be connected to any one of the resistors R1 , R2 , R3 . . . and RN.

[0049] Alternatively, as Figure 6 As shown, the second voltage regulating unit 23 includes a second resistor R7 , one end of the second resistor R7 is connected to the output end of the multi-way selection switch SW, and the other end of the second resistor R7 is connected to the ground end GND.

[0050] It should be noted that the second resistor R7 can form a corresponding voltage divider circuit with each first resistor RX under the control of the multi-way selection switch SW, thereby reducing the number of second resistors R7 used.

[0051] Alternatively, as Figure 7 As shown, the battery management circuit 100 also includes a voltage processing module 40 module, the input end of the voltage processing module 40 module is connected to the positive pole PACK+ of the battery pack 10, and the output end of the voltage processing module 40 module is connected to the power supply end BAT of the single string fuel meter 30 and the enable end CE of the single string fuel meter 30.

[0052] It should be noted that since the working voltage of the single-string fuel meter 30 can only adapt to the voltage of a single cell, but cannot adapt to the total voltage B+ of multiple series-connected cells, in order to enable the working voltage of the single-string fuel meter 30 to adapt to the total voltage B+ of multiple series-connected cells, this embodiment adds a voltage processing module 40; and the power supply end BAT of the single-string fuel meter 30 is connected to the enable end CE of the single-string fuel meter 30, which can control the single-string fuel meter 30 to be in a continuously working state.

[0053] Alternatively, as Figure 8 As shown, the voltage processing module 40 includes a voltage divider unit 41, a voltage follower 42 and a third voltage regulating unit 43. The voltage divider unit 41 is connected between the positive pole PACK+ of the battery pack 10 and the ground terminal GND; the positive input terminal of the voltage follower 42 is connected to the output terminal of the voltage divider unit 41, the negative input terminal of the voltage follower 42 is connected to the output terminal of the voltage follower 42, the positive power supply terminal of the voltage follower 42 is connected to the positive pole PACK+ of the battery pack 10, and the negative power supply terminal of the voltage follower 42 is connected to the ground terminal GND; the input terminal of the third voltage regulating unit 43 is connected to the output terminal of the voltage follower 42, and the output terminal of the third voltage regulating unit 43 is connected to the power supply terminal BAT of the single string fuel meter 30 and the enable terminal CE of the single string fuel meter 30.

[0054] It should be noted that the input voltage of the positive input terminal of the voltage follower 42 is 1 / N of the total battery voltage (B+), which is equivalent to the voltage of a single battery cell. Since its output voltage always follows the input voltage of the positive input terminal, the output voltage of the voltage follower 42 is the voltage of a single battery cell, which is output to the single-string fuel meter 30 for power supply. At the same time, the output capacity of the voltage follower 42 can meet the normal operation of the single-string fuel meter 30.

[0055] Alternatively, as Figure 9 As shown, the voltage divider unit 41 includes a third resistor R6 and a fourth resistor R5, one end of the third resistor R6 is connected to the positive electrode PACK+ of the battery pack 10; one end of the fourth resistor R5 is connected to the other end of the third resistor R6 and the non-inverting input end of the voltage follower 42, and the other end of the fourth resistor R5 is connected to the ground end GND; wherein, the ratio of the resistance value of the fourth resistor R5 to the resistance value of the third resistor R6 is 1:(N-1).

[0056] It should be noted that, assuming that the number of battery cells connected in series in the battery pack 10 is N, the positive electrode PACK+ voltage of the battery pack 10 is N times the positive electrode voltage of the single cell, and the ratio of the resistance value of the fourth resistor R5 to the resistance value of the third resistor R6 is set to 1:(N-1). The positive electrode PACK+ voltage of the battery pack 10 can be reduced to 1 / N, that is, the positive electrode voltage of the single cell, thereby achieving the working voltage of the single-string fuel meter 30 being able to adapt to the total voltage B+ of multiple series-connected battery cells.

[0057] Figure 10 The circuit schematic diagram of the battery management circuit 100 provided in an embodiment of the present application is shown. The voltage follower 42 can be implemented by an operational amplifier (OPA), and 2, 3, 4, 5, and 6 represent the inverting input, non-inverting input, positive power supply terminal, negative power supply terminal, and output terminal of the operational amplifier (OPA), respectively.

[0058] The third voltage regulating unit 43 may include a fifth resistor R5 , one end of the fifth resistor R8 is connected to the output end of the operational amplifier OPA, and the other end of the fifth resistor R8 is connected to the power supply end BAT and the enable end CE.

[0059] The single-string fuel meter 30 may also include a fuel meter chip U2, a first capacitor C1, and a second capacitor C2. One end of the first capacitor C1 is connected to the ground terminal GND, and the other end of the first capacitor C1 is connected to the voltage sampling pin BAT_SNS for filtering. One end of the second capacitor C2 is connected to the ground terminal GND, and the other end of the second capacitor C2 is connected to the enable terminal CE. The VSS pin of the fuel meter chip U2 is connected to the ground terminal GND.

[0060] The single-string fuel meter 30 may further include a third capacitor C3 , one end of the third capacitor C3 is connected to the positive electrode PACK+ of the battery pack 10 , and the other end of the third capacitor C3 is connected to the ground terminal GND.

[0061] The single-string fuel meter 30 may further include a sixth resistor R13 and a seventh resistor R14 . The sixth resistor R13 is connected to the SCL pin of the fuel meter chip U2 , and the seventh resistor R14 is connected to the SDA pin of the fuel meter chip U2 to communicate with the outside.

[0062] The single-string fuel meter 30 may further include a thermistor R9 , one end of which is connected to the TS pin of the fuel meter chip U2 , and the other end of which is connected to the ground terminal GND to obtain the temperature of the corresponding battery cell. The thermistor R9 may be a negative temperature coefficient thermistor (NTC).

[0063] The single-string fuel meter 30 can also include an eighth resistor R11, a ninth resistor R10, a tenth resistor R12 and a fourth capacitor C4. The eighth resistor R11 is connected between the negative electrode PACK- of the battery pack 10 and the ground terminal GND, one end of the ninth resistor R10 is connected to the ground terminal GND, the other end of the ninth resistor R10 is connected to one end of the fourth capacitor C4 and the SRP pin of the fuel meter chip U2, one end of the tenth resistor R12 is connected to the negative electrode PACK- of the battery pack 10, and the other end of the tenth resistor R12 is connected to the other end of the fourth capacitor C4 and the SRN pin of the fuel meter chip U2 to detect the current of each battery cell.

[0064] in, Figure 10 The specific parameters of each component are only exemplary and not limiting.

[0065] Its working principle is: the total voltage B+ of the battery pack 10 becomes 1 / N of the original voltage after being divided by the voltage divider unit 41, that is, the voltage of the single cell, and after being processed by the voltage follower 42, it can provide a suitable operating voltage for the fuel meter chip U2 and control the fuel meter chip U2 to be in a continuous working state.

[0066] By switching the multi-way selection switch SW, the fuel meter chip U2 can obtain the positive voltage of each battery cell, and then obtain the voltage of each battery cell by subtracting the positive voltages of each battery cell.

[0067] The present embodiment further provides a chip 200, which includes the battery management circuit 100. The chip 200 is also called an integrated circuit (IC), and can be, but is not limited to, a SOC (System on Chip) chip or a SIP (System in Package) chip.

[0068] It can be understood that since the chip 200 provided in the embodiment of the present application includes the above-mentioned battery management circuit 100, it can also connect the positive pole of each battery cell through the voltage measurement selection module 20, so that the single-string fuel meter 30 can measure the positive pole voltage of each battery cell. The single-string fuel meter 30 can obtain the voltage of each battery cell through a simple calculation based on the positive pole voltage of each battery cell. In this way, the voltage of each battery cell in multiple series-connected battery cells can be measured by the single-string fuel meter 30, thereby solving the problem that the single-string fuel meter 30 cannot measure the voltage of each battery in multiple series-connected batteries.

[0069] Compared with the multi-string fuel meter, the single-string fuel meter 30 has a lower cost, thus also reducing the cost of the battery management circuit 100 .

[0070] The embodiment of the present application also provides an electronic device 300, which includes a device body and the above-mentioned chip 200 or battery management circuit 100 provided in the device body. The electronic device 300 can be, but is not limited to, a weight scale, a body fat scale, a nutrition scale, an infrared electronic thermometer, a pulse oximeter, a body composition analyzer, a mobile power supply, a wireless charger, a fast charger, a car charger, an adapter, a display, a USB (Universal Serial Bus) docking station, a stylus, a true wireless headset, a car central control panel, a car, a smart wearable device, a mobile terminal, and a smart home device. Smart wearable devices include, but are not limited to, smart watches, smart bracelets, and cervical massagers. Mobile terminals include, but are not limited to, smartphones, laptops, tablets, and POS (point of sales terminal) machines. Smart home devices include, but are not limited to, smart sockets, smart rice cookers, smart sweepers, and smart lights.

[0071] It can be understood that since the electronic device 300 provided in the embodiment of the present application includes the above-mentioned chip 200 or battery management circuit 100, it can also connect the positive pole of each battery cell through the voltage measurement selection module 20, so that the single-string fuel meter 30 can measure the positive pole voltage of each battery cell. The single-string fuel meter 30 can obtain the voltage of each battery cell through a simple calculation based on the positive pole voltage of each battery cell. In this way, the voltage of each battery cell in multiple series-connected battery cells can be measured by the single-string fuel meter 30, thereby solving the problem that the single-string fuel meter 30 cannot measure the voltage of each battery in multiple series-connected batteries.

[0072] Compared with the multi-string fuel meter, the single-string fuel meter 30 has a lower cost, thus also reducing the cost of the battery management circuit 100 .

[0073] The above is only a preferred embodiment of the present application and does not constitute any form of limitation to the present application. Although the present application has been disclosed as above with preferred embodiments, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to equivalent embodiments using the technical contents disclosed above without departing from the scope of the technical solution of the present application. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A battery management circuit, characterized in that: The battery management circuit includes: A battery pack, comprising a plurality of battery cells connected in series; A voltage measurement selection module, wherein the voltage measurement selection module is connected to the positive electrode of each battery cell; A single-string electricity meter is connected to the voltage measurement selection module, and the single-string electricity meter obtains the voltage of a single battery cell according to the difference between the positive electrode voltages of two adjacent battery cells.

2. The battery management circuit according to claim 1, wherein: The voltage measurement selection module includes: A switching unit, the switching unit comprising a plurality of input terminals and an output terminal; a plurality of first voltage regulating units, each of the first voltage regulating units being connected between an input end of the switching unit and a positive electrode of the battery cell; A second voltage regulating unit, one end of the second voltage regulating unit is connected to the output end of the switching unit and the voltage sampling pin of the single-string fuel meter, and the other end of the second voltage regulating unit is connected to the battery pack and the ground end.

3. The battery management circuit according to claim 2, wherein: Each of the first voltage regulating units includes a first resistor, one end of the first resistor is connected to an input end of the switching unit, and the other end of the first resistor is connected to the positive electrode of one of the battery cells; The first resistor is connected to the second voltage regulating unit through the switching unit, so as to divide the positive voltage of each battery cell into the voltage of a single battery cell.

4. The battery management circuit according to claim 3, wherein: The plurality of battery cells include a first battery cell to an Nth battery cell, wherein the first battery cell to the Nth battery cell are sequentially connected in series from the ground terminal to the positive electrode of the battery pack, where N is an integer greater than or equal to 2; The resistance of the first resistor connected to the positive electrode of the Nth battery cell is greater than the resistance of the first resistor connected to the positive electrode of the N-1th battery cell.

5. The battery management circuit according to claim 4, wherein: The switching unit includes a multi-way selection switch, each input end of the multi-way selection switch is connected to one end of the first resistor, and the output end of the multi-way selection switch is connected to one end of the second voltage regulation unit and the voltage sampling pin of the single-string electricity meter.

6. The battery management circuit according to claim 5, wherein: The second voltage regulating unit includes a second resistor, one end of the second resistor is connected to the output end of the multi-way selection switch, and the other end of the second resistor is connected to the ground end.

7. The battery management circuit according to claim 4, wherein: The battery management circuit also includes a voltage processing module, the input end of the voltage processing module is connected to the positive electrode of the battery pack, and the output end of the voltage processing module is connected to the power supply end of the single-string fuel meter and the enable end of the single-string fuel meter.

8. The battery management circuit according to claim 7, wherein: The voltage processing module includes: a voltage dividing unit connected between the positive electrode of the battery pack and a ground terminal; a voltage follower, wherein the non-inverting input terminal of the voltage follower is connected to the output terminal of the voltage divider unit, the inverting input terminal of the voltage follower is connected to the output terminal of the voltage follower, the positive power supply terminal of the voltage follower is connected to the positive electrode of the battery pack, and the negative power supply terminal of the voltage follower is connected to the ground terminal; A third voltage regulating unit, wherein the input end of the third voltage regulating unit is connected to the output end of the voltage follower, and the output end of the third voltage regulating unit is connected to the power supply end of the single-string electricity meter and the enable end of the single-string electricity meter.

9. The battery management circuit according to claim 8, wherein: The voltage dividing unit includes: a third resistor, one end of the third resistor being connected to the positive electrode of the battery pack; a fourth resistor, one end of the fourth resistor being connected to the other end of the third resistor and the non-inverting input end of the voltage follower, and the other end of the fourth resistor being connected to the ground end; The ratio of the resistance value of the fourth resistor to the resistance value of the third resistor is 1:(N-1).

10. A chip, characterized in that: The chip includes the battery management circuit according to any one of claims 1 to 9.

11. An electronic device, characterized in that: The electronic device includes a device body and the chip according to claim 10 provided in the device body.

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