Battery system and power saving method for battery system
By controlling the working state of the battery protection circuit through load detection circuit and switching circuit, the problems of complex circuit and high power consumption in the battery system are solved, and the battery system structure is simplified and energy-saving effect is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- HYTERA COMM CORP
- Filing Date
- 2021-06-16
- Publication Date
- 2026-06-12
AI Technical Summary
In existing battery systems, the battery protection circuit still consumes power and occupies multiple pin resources when idle, resulting in complex circuit structure, large space and high cost.
A load detection circuit is used to detect the connection between the battery and external devices, generate a power supply signal to control the working state of the battery protection circuit, and turn the connection between the battery and the battery protection circuit on or off by a switching circuit, so that the battery protection circuit only works when connected.
This simplifies the circuit structure, reduces the number of pins used, lowers power consumption, reduces production costs, and shrinks the size of the battery system.
Smart Images
Figure CN115483726B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery technology, and in particular to a battery system and a method for saving power in a battery system. Background Technology
[0002] During battery use, the battery protection circuit is always active, consuming battery power and affecting battery life. Therefore, a power source is needed to control and shut down the battery protection circuit when the battery is idle. However, existing products often connect a dedicated control pin of the battery protection circuit to the control circuit, using this pin to control whether the battery protection circuit operates. This results in the circuit consuming more pin resources, having a complex structure, occupying more space, and incurring high manufacturing costs. Summary of the Invention
[0003] In view of this, this application provides a battery system and a power-saving method for the battery system, which can simplify the circuit structure and reduce the overall size.
[0004] To solve the above-mentioned technical problems, one technical solution adopted in this application is: to provide a battery system, which includes: a battery, a load detection circuit, a battery protection circuit, and a switching circuit; the load detection circuit is connected to the battery and is used to generate a first power supply signal after detecting that the battery is connected to an external electronic device; the battery protection circuit is connected to the load detection circuit and is used to operate in a working state after receiving the first power supply signal and generate a power supply control signal; the switching circuit is connected to the battery protection circuit and the battery and is used to conduct the path between the battery and the battery protection circuit after receiving the power supply control signal, so as to short-circuit the load detection circuit.
[0005] In one embodiment of this application, when the battery is not connected to an external electronic device, the load detection circuit stops outputting the first power supply signal, the battery protection circuit is in a non-working state, and the switching circuit is in an open state.
[0006] In one embodiment of this application, the battery includes a cell and a power supply terminal. The cell is used to generate a power signal, and the power supply terminal is used to connect to an external electronic device to supply power to the external electronic device.
[0007] In one embodiment of this application, the power supply terminal includes a first power supply terminal and a second power supply terminal. The load detection circuit is connected to the first power supply terminal and the battery cell and is used to detect the resistance value of an external electronic device disposed between the first power supply terminal and the second power supply terminal. When the resistance value of the external electronic device is less than a first preset value, a first power supply signal is generated.
[0008] In one embodiment of this application, the load detection circuit includes a first resistor, a second resistor, and a first switching transistor. One end of the first resistor is connected to a first power supply terminal. The second resistor has one end connected to the other end of the first resistor and the other end connected to the output terminal of the battery cell. The first switching transistor has a first end connected to the output terminal of the battery cell, a second end connected to the other end of the first resistor, and a third end connected to the battery protection circuit.
[0009] In one embodiment of this application, when the resistance of the external electronic device is less than a first preset value, the first switch is turned on to open the path between the battery protection circuit and the output terminal of the battery cell; when the resistance of the external electronic device is greater than the first preset value, the first switch is turned off to close the path between the battery protection circuit and the output terminal of the battery cell. The first preset value is related to the resistance of the first resistor, the resistance of the second resistor, the threshold voltage of the first switch, and the power supply voltage of the battery.
[0010] In one embodiment of this application, the first preset value is greater than the input impedance of the external electronic device when the power supply terminal is connected to the external electronic device; the switching circuit includes a second switching transistor, which is connected to the control terminal of the battery protection circuit, the first power supply terminal, and the output terminal of the battery cell.
[0011] In one embodiment of this application, the battery system further includes a coupling circuit, which is connected to the power supply terminal of the switching circuit and the battery protection circuit. The coupling circuit processes the power supply signal output by the battery to generate a second power supply signal, short-circuits the load detection circuit, and inputs the second power supply signal to the power supply terminal of the battery protection circuit to power the battery protection circuit.
[0012] In one embodiment of this application, the battery system further includes a unidirectional conduction circuit, which is connected to the battery protection circuit and the load detection circuit, and is used to control the first power supply signal to flow from the load detection circuit to the battery protection circuit.
[0013] To solve the above-mentioned technical problems, another technical solution adopted in this application is: to provide a power-saving method for a battery system. This method is applied to the battery system described in any of the above embodiments. The battery system includes: a battery, a load detection circuit, a battery protection circuit, and a switching circuit. The method includes: generating a first power supply signal after the load detection circuit detects that the battery is connected to an external electronic device; generating a power supply control signal after the battery protection circuit is in a working state upon receiving the first power supply signal; and conducting the path between the battery and the battery protection circuit after receiving the power supply control signal, thereby short-circuiting the load detection circuit.
[0014] The beneficial effects of this application through the above solution are as follows: The battery system provided by this application includes a battery, a load detection circuit, a battery protection circuit, and a switching circuit. The load detection circuit is connected to the battery and can detect whether the battery is connected to an external electronic device. When the battery is connected to an external electronic device, it generates a first power supply signal and inputs the first power supply signal to the battery protection circuit so that the battery protection circuit is in a working state. At this time, the battery protection circuit can generate a power supply control signal and input it to the switching circuit. After receiving the power supply control signal, the switching circuit conducts the path between the battery and the battery protection circuit, thereby causing the load detection circuit to short-circuit, and the battery can supply power to the battery protection circuit; the load detection circuit is used to detect... This invention detects whether the battery is connected to an external electronic device and supplies power to the battery protection circuit when the battery is connected, ensuring the circuit operates normally. In other words, the operation of the battery protection circuit is controlled by whether the battery is connected to an external electronic device, allowing it to operate only when the battery system is connected, thus reducing power consumption. Compared to solutions requiring a dedicated control pin at the battery's discharge terminal, this application eliminates the need for additional control pins, reducing the hassle of connecting the battery protection circuit to other control circuits, decreasing the number of control pins used, simplifying the battery system's structure, reducing its overall size, and saving production costs. Attached Figure Description
[0015] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Furthermore, these drawings and textual descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concepts of this application to those skilled in the art through reference to specific embodiments.
[0016] Figure 1 This is a schematic diagram of the structure of the first embodiment of the battery system provided in this application;
[0017] Figure 2 This is a schematic diagram of the structure of the second embodiment of the battery system provided in this application;
[0018] Figure 3 yes Figure 2 The schematic diagram of the load detection circuit in the embodiment shown is as follows;
[0019] Figure 4 yes Figure 2 The schematic diagram of the battery protection circuit in the embodiment shown is as follows;
[0020] Figure 5 This is a flowchart illustrating an embodiment of the power-saving method for a battery system provided in this application. Detailed Implementation
[0021] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the embodiments of this application. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0022] To address the technical problems of existing battery systems, such as excessive pin resources, complex circuit structures, and high manufacturing costs, this application provides a battery system and a power-saving method for the battery system. A load detection circuit is used to detect whether the battery is connected to an external electronic device. When the battery is connected to the external electronic device, a first power supply signal is generated and input to the battery protection circuit, causing the battery protection circuit to operate. Upon receiving the first power supply signal, the battery protection circuit generates a power supply control signal and inputs it to a switching circuit. The switching circuit is used to turn the path between the battery and the battery protection circuit on / off, controlling whether the battery supplies power to the battery protection circuit. Using a load detection circuit to replace the control circuit and other circuit structures in the prior art simplifies the overall circuit structure and helps to reduce the overall size of the battery system. Moreover, the load detection circuit can automatically output the first power supply signal to detect whether the battery is connected to an external electronic device, allowing control of the battery protection circuit's operation based on whether the battery system is connected to an external electronic device. This ensures that the battery protection circuit only operates when the battery system is connected to an external electronic device, thus saving power. The technical solution of this application will be described in detail below.
[0023] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of the first embodiment of the battery system provided in this application. The battery system includes a battery 11, a load detection circuit 12, a battery protection circuit 13, and a switching circuit 14.
[0024] The battery 11 is used to store electrical energy and discharge it. When the battery 11 is connected to the external electronic device 20, the battery 11 outputs the stored electrical energy to the external electronic device 20 to supply power to the external electronic device 20.
[0025] The load detection circuit 12 is connected to the battery 11 and is used to generate a first power supply signal after detecting that the battery 11 is connected to the external electronic device 20.
[0026] The battery protection circuit 13 is connected to the load detection circuit 12. It is used to operate after receiving the first power supply signal and generate a power supply control signal, which can protect the battery 11.
[0027] The switching circuit 14 is connected to the battery 11 and the battery protection circuit 13. After receiving the power supply control signal, it is used to open the path between the battery 11 and the battery protection circuit 13 so that the load detection circuit 12 is short-circuited and can supply power to the battery protection circuit 13.
[0028] Furthermore, the load detection circuit 12 can detect whether the battery 11 is connected to the external electronic device 20. After detecting that the battery 11 is connected to the external electronic device 20, it generates a first power supply signal and inputs it to the battery protection circuit 13. The first power supply signal is used to control the operation of the battery protection circuit 13. After receiving the first power supply signal, the battery protection circuit 13 is in working state and generates a power supply control signal. After receiving the power supply control signal, the switching circuit 14 conducts the path between the battery 11 and the battery protection circuit 13, so that the battery 11 supplies power to the battery protection circuit 13. Since the path between the battery 11 and the battery protection circuit 13 is conducted, the load detection circuit 12 is short-circuited. Therefore, when the battery 11 is connected to the external electronic device 20, the load detection circuit 12 can control the operation of the battery protection circuit 13. And when the battery protection circuit 13 is in working state, the load detection circuit 12 is short-circuited and stops working. Thus, during the use of the battery system, the load detection circuit 12 is prevented from always being in working state and consuming power, thereby saving power.
[0029] When battery 11 is not connected to external electronic device 20, load detection circuit 12 stops outputting the first power supply signal, and battery protection circuit 13 lacks a power source and is in a non-operating state, i.e., battery protection circuit 13 stops working. At this time, battery protection circuit 13 stops outputting power supply control signal, switch circuit 14 is in the closed state, and the path between battery 11 and battery protection circuit 13 is broken. Understandably, when load detection circuit 12 detects that battery 11 is connected to external electronic device 20 again, it generates the first power supply signal to control battery protection circuit 13 to be in an operating state. Battery protection circuit 13 generates power supply control signal and inputs it to switch circuit 14 to realize that battery 11 supplies power to battery protection circuit 13, thereby avoiding battery protection circuit 13 consuming power when the battery system is not in use, and realizing energy saving.
[0030] In other embodiments, when the discharge current of battery 11 is less than a set value, it can be assumed that the external electronic device 20 is fully charged, or that the battery system is not connected to the external electronic device 20. In this case, the battery protection circuit 13 can stop operating. The battery protection circuit 13 can control the switching circuit 14 to disconnect the path between battery 11 and the battery protection circuit 13. Specifically, the battery protection circuit 13 is also used to control the switching circuit 14 to disconnect the path between battery 11 and the battery protection circuit 13 when the discharge current of battery 11 is less than the set value, thereby controlling battery 11 to stop supplying power to the external electronic device 20. Here, the set value is also a current value, and its specific range can be set according to the actual application scenario, which will not be elaborated further here.
[0031] Furthermore, when the battery 11 is connected to different external electronic devices 20, the discharge current of the battery 11 may be different. Therefore, the setting value can be set according to the actual application scenario to adapt to different external electronic devices 20.
[0032] Therefore, in this embodiment, the battery system can control the operation of the battery protection circuit by whether the battery is connected to an external electronic device. This ensures that the battery protection circuit is only active when the battery is connected to an external electronic device, and is inactive when not connected, thus saving power. At the same time, it avoids the complex circuit structure when the battery protection circuit is connected to the control circuit, making the battery system simple in structure and occupying less space. Compared with the solution that requires a dedicated control pin at the battery discharge end, the battery system in this embodiment does not need to add an extra control pin, reducing the number of control pins used and helping to save production costs.
[0033] Please see Figure 2 , Figure 2 This is a schematic diagram of the second embodiment of the battery system provided in this application. This embodiment is similar to the previous embodiment, and the same circuit structure will not be described again here.
[0034] The battery 11 includes a cell 111 and a power supply terminal (not shown in the figure). The cell 111 is used to generate a power signal, and the power supply terminal is used to connect to an external electronic device 20 to supply power to the external electronic device 20. Specifically, the cell 111 and the power supply terminal are connected through a switching circuit 14. After the load detection circuit 12 detects that the battery 11 is connected to the external electronic device 20, it generates a first power supply signal and inputs it to the battery protection circuit 13, so that the battery protection circuit 13 generates a power supply control signal and inputs it to the switching circuit 14. The switching circuit 14 can conduct the path between the battery 11 and the battery protection circuit 13, and it can also conduct the path between the cell 111 and the power supply terminal, so that when the battery protection circuit 13 is in the working state, the battery 11 supplies power to the external electronic device 20.
[0035] Please refer to the following: Figure 2 and Figure 3 , Figure 3 yes Figure 2 The schematic diagram of the load detection circuit in the embodiment shown below explains in detail how the load detection circuit 12 detects whether the battery 11 is connected to the external electronic device 20.
[0036] The battery cell 111 includes an output terminal VB and a ground terminal GND. The power supply terminal includes a first power supply terminal P+ and a second power supply terminal P-. An external electronic device 20 is connected between the first power supply terminal P+ and the second power supply terminal P-. The first power supply terminal P+ is connected to the output terminal VB of the battery cell 111 through a switching circuit 14, and the second power supply terminal P- is connected to the ground terminal GND of the battery cell 111.
[0037] The load detection circuit 12 is connected to the first power supply terminal P+ and the output terminal VB of the battery cell 111. It is used to detect the resistance of the external electronic device 20 located between the first power supply terminal P+ and the second power supply terminal P-. When the resistance of the external electronic device 20 is less than the first preset value, a first power supply signal is generated and input to the battery protection circuit 13.
[0038] Furthermore, such as Figure 3 As shown, the load detection circuit 12 includes a first resistor R1, a second resistor R2, and a first switching transistor Q1. One end of the first resistor R1 is connected to the first power supply terminal P+; one end of the second resistor R2 is connected to the other end of the first resistor R1, and the other end of the second resistor R2 is connected to the output terminal VB of the battery cell 111; the first end of the first switching transistor Q1 is connected to the output terminal VB of the battery cell 111, the second end of the first switching transistor Q1 is connected to the other end of the first resistor R1, and the third end of the first switching transistor Q1 is connected to the battery protection circuit 13.
[0039] Optionally, the first switch Q1 can be a metal-oxide-semiconductor field-effect transistor (MOSFET) or an insulated-gate bipolar transistor (IGBT), etc., and the first terminal, the second terminal, and the third terminal of the first switch Q1 are the drain, the gate, and the source, respectively.
[0040] When the external electronic device 20 is connected to the first power supply terminal P+ and the second power supply terminal P-, the resistance between the first power supply terminal P+ and the second power supply terminal P- changes accordingly. It is easy to understand that when the battery 11 is not connected to the external electronic device 20, the first power supply terminal P+ and the second power supply terminal P- are not connected, and the resistance between the first power supply terminal P+ and the second power supply terminal P- is approximately infinite. When the battery 11 is connected to the external electronic device 20, a circuit is formed between the first power supply terminal P+ and the second power supply terminal P-, that is, the first resistor R1, the second resistor R2, the battery cell 111 and the external electronic device 20 form a closed loop, and the voltage across the second resistor R2 is also different when the resistance of the external electronic device 20 is different.
[0041] Specifically, when the resistance of the external electronic device 20 is less than the first preset value, that is, when the voltage across the second resistor R2 is greater than the threshold voltage of the first switch Q1, the first switch Q1 is turned on, the path between the battery protection circuit 13 and the output terminal VB of the cell 111 is opened, the battery protection circuit 13 is in working state, the battery protection circuit 13 generates a power supply control signal and inputs it to the switch circuit 14, which connects the path between the cell 111 and the first power supply terminal P+, the load detection circuit 12 is short-circuited, that is, the first resistor R1 and the second resistor R2 are short-circuited. Since the voltage across the second resistor R2 is less than the threshold voltage of the first switch Q1, the first switch Q1 is in the off state (that is, the first switch Q1 is turned off), the load detection circuit 12 stops working, thereby reducing the power consumption during the use of the battery 11.
[0042] When the resistance of the external electronic device 20 is greater than the first preset value, the voltage across the second resistor R2 is less than the threshold voltage of the first switch Q1. It can be assumed that the external electronic device 20 is not connected between the first power supply terminal P+ and the second power supply terminal P-. At this time, the first switch Q1 is in the off state to close the path between the battery protection circuit 13 and the output terminal VB of the battery cell 111. Thus, when the battery 11 is not connected to the external electronic device 20, the battery protection circuit 13 stops working to reduce power consumption.
[0043] Furthermore, the first preset value is related to the resistance value of the first resistor R1, the resistance value of the second resistor R2, the threshold voltage of the first switch Q1, and the power supply voltage of the battery 11. The first preset value is greater than the resistance value of the external electronic device 20 when the power supply terminal is connected to the external electronic device 20.
[0044] by Figure 2 Taking the battery system shown as an example, let RLoad represent the first preset value, Vbat represent the supply voltage of battery 11, and Vgs represent the threshold voltage of the first switch Q1. The relationship between Vgs and Vbat is as follows:
[0045] Vgs=Vbat*R2 / (R1+R2+RLoad) (1)
[0046] The formula for calculating the first preset value can be derived from the above formula as follows:
[0047] RLoad=(R2*Vbat) / Vgs-(R1+R2) (2)
[0048] The solution provided in this embodiment was tested, and the data shown in Table 1 can be obtained. Table 1 specifically shows the values of the first preset value under the conditions that the power supply voltage of battery 11 is 6V, 7.4V and 8.4V respectively:
[0049] Table 1. Values of the first preset value under different conditions.
[0050]
[0051] Generally speaking, the input impedance of the external electronic device 20 connected to the power system is usually around 200KΩ. The first preset value obtained by the above calculation formula (2) is greater than 200KΩ. In other words, the first preset value calculated by the calculation formula (2) can ensure that the battery protection circuit 13 is in working state when the battery 11 is connected to the external electronic device 20.
[0052] Please continue to refer to the following: Figure 2 and Figure 3 The switching circuit 14 includes a second switching transistor Q2, which is connected to the control terminal DSG, the first power supply terminal P+, and the output terminal VB of the battery cell 111 of the battery protection circuit 13.
[0053] Optionally, the second switch Q2 can be a MOSFET or an IGBT, etc. The source of the second switch Q2 is connected to the output terminal VB of the battery cell 111, the gate of the second switch Q2 is connected to the control terminal DSG of the battery protection circuit 13, and the drain of the second switch Q2 is connected to the first power supply terminal P+. After the battery protection circuit 13 generates a power supply control signal, the second switch Q2 is turned on, the load detection circuit 12 is short-circuited, and the battery 11 supplies power to the battery protection circuit 13 through the second switch Q2.
[0054] Please continue to refer to the following: Figure 2 and Figure 3The battery system also includes a coupling circuit 15, which is connected to the power supply terminal VC of the switching circuit 14 and the battery protection circuit 13. The coupling circuit 15 processes the power signal output from the battery 11, generates a second power supply signal, and inputs the second power supply signal to the power supply terminal VC of the battery protection circuit 13. This ensures that the battery protection circuit 13 is continuously powered when the battery 11 is connected to the external electronic device 20, thereby guaranteeing that the battery protection circuit 13 remains operational and improving the reliability of the battery system. Optionally, the coupling circuit 15 can be a coupling resistor R3.
[0055] Furthermore, the battery system also includes a unidirectional conduction circuit 16, which is connected to the battery protection circuit 13 and the load detection circuit 12. It is used to control the flow of the first power supply signal from the load detection circuit 12 to the battery protection circuit 13. When the path between the battery 11 and the battery protection circuit 13 is open, it prevents the battery protection circuit 13 from inputting an electrical signal to the load detection circuit 12, and also prevents the second power supply signal from inputting to the load detection circuit 12, thereby improving the reliability of the battery system.
[0056] Optionally, the unidirectional conduction circuit 16 can be a diode D1. Taking the unidirectional conduction circuit 16 as a diode D1 as an example, the positive terminal of the diode D1 is connected to the load detection circuit 12, and the negative terminal of the diode D1 is connected to the battery protection circuit 13, so as to realize that the first power supply signal flows only from the load detection circuit 12 to the battery protection circuit 13.
[0057] Please refer to the following: Figure 2 and Figure 4 , Figure 4 yes Figure 2 The schematic diagram of the battery protection circuit in the illustrated embodiment shows that the battery protection circuit 13 can be a battery protection chip, etc., and is not limited here. Specifically, the battery protection chip can detect the discharge current of the battery 10. When the discharge current of the battery 11 is less than a set value and the delay exceeds a set time, the battery system can be considered to be idle, that is, the battery system is not connected to the external electronic device 20. The battery protection chip enters the power saving mode, that is, the switching circuit 14 disconnects the path between the battery 11 and the battery protection circuit 13, and the battery 11 stops supplying power to the battery protection circuit 13. When the battery system is connected to the external electronic device 20, the battery protection chip can work normally. The specific working principle has been explained above and will not be repeated here.
[0058] Furthermore, please combine Figure 2 and Figure 4The battery system also includes a charging control circuit 17, which is connected to the battery 11 and an external power source (not shown in the figure). During the charging process of the battery system, after the battery 11 reaches the preset power level, the circuit between the external power source and the battery 11 is turned off to stop supplying power to the battery 11, thereby preventing the battery 11 from being overcharged and improving the safety of the battery system.
[0059] Optionally, the charging control circuit 17 can also be connected to the battery protection circuit 13. The battery protection circuit 13 can obtain the power of the battery 11 and control the charging control circuit 17 to disconnect when the power of the battery 11 reaches a preset power level, so as to disconnect the battery 11 from the external power source.
[0060] The charging control circuit 17 can be a third switch Q3. The third switch Q3 is connected to the control terminal CHG of the battery protection circuit 13 via a fourth resistor R4, and the fourth resistor R4 is connected to the output terminal VB of the battery 11 via a fifth resistor R5. The power supply terminal VC of the battery protection circuit 13 is connected to the first power supply terminal P+ via a coupling resistor R3, and the control terminal DSG of the battery protection circuit 13 is connected to the first power supply terminal P+ via a sixth resistor R6 and a seventh resistor R7. Specifically, the third switch Q3 can be a MOSFET or an IGBT, etc. The source of the third switch Q3 is connected to the output terminal VB of the battery 11, the gate of the third switch Q3 is connected to the control terminal DSG of the battery protection circuit 13, and the drain of the third switch Q3 is connected to the source of the second switch Q2. When the battery 11 reaches a preset charge level, the third switch Q3 is turned off. It should be noted that... Figure 4 The two instances of "VB" ports indicate that both ports are connected to the output terminal VB of battery 11 (e.g., ...). Figure 3 (as shown in the diagram), rather than connecting the two ends to different input power sources respectively.
[0061] The preset power level can be the remaining power of battery 11 being 100% (i.e., battery 11 is fully charged), etc. Of course, in this embodiment, the preset power level can also be other power values, which are not limited here.
[0062] Furthermore, the battery system also includes a discharge port and a charging port (not shown in the figure). The discharge port is used to connect to an external electronic device 20 to supply power to the external electronic device 20, and the charging port is used to connect to an external power source to charge the battery system. Understandably, when the connection between the external charging power source and the charging port is disconnected, the control terminal CHG of the battery protection circuit 13 controls the third switch Q3 to turn on.
[0063] Please see Figure 5 , Figure 5This is a flowchart illustrating an embodiment of the power-saving method for a battery system provided in this application. The method is applied to the battery system described in the above embodiment. The battery system includes a battery, a load detection circuit, a battery protection circuit, and a switching circuit. The specific connection relationships, functions, and working principles are the same as in the above embodiment, and will not be repeated here.
[0064] S101: After the load detection circuit detects that the battery is connected to an external electronic device, it generates a first power supply signal.
[0065] The load detection circuit can detect whether the battery is connected to an external electronic device. Upon detecting this connection, it generates a first power supply signal and inputs it to the battery protection circuit. Conversely, if the load detection circuit does not detect a connection, it stops outputting the first power supply signal, and the battery protection circuit, lacking a power source, becomes inactive. This mitigates the energy consumption of the battery protection circuit when the battery system is not in use, thus conserving energy.
[0066] S102: The battery protection circuit is in working condition after receiving the first power supply signal and generates a power supply control signal.
[0067] After the load detection circuit outputs the first power supply signal, the battery protection circuit can receive the first power supply signal, so that the battery protection circuit is in working state, generates a power supply control signal and outputs it to the switching circuit.
[0068] S103: After receiving the power supply control signal, the switching circuit opens the path between the battery and the battery protection circuit, so as to short-circuit the load detection circuit.
[0069] After receiving the power supply control signal, the switching circuit connects the battery and the battery protection circuit. At this time, the load detection circuit is short-circuited, and the battery can supply power to the battery protection circuit, so that the battery protection circuit can be in working state to monitor the working state of the battery system. It can also prevent the load detection circuit from consuming power while it is always in working state, thereby saving power.
[0070] In summary, the battery system and power-saving method provided in this application can control the operation of the battery protection circuit by whether the battery is connected to an external electronic device. Compared with the solution that requires designing a dedicated control pin at the battery discharge end, this application can save power without adding an extra control pin, reducing the number of control pins used, making the battery system simple in structure and occupying less space, which helps to save production costs.
[0071] Furthermore, in this application, unless otherwise expressly specified and limited, the terms "connected," "linked," "stacked," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.
Claims
1. A battery system characterized by, include: Battery; A load detection circuit, connected to the battery, is used to generate a first power supply signal after detecting that the battery is connected to an external electronic device; A battery protection circuit, connected to the load detection circuit, is used to operate after receiving the first power supply signal and generate a power supply control signal. A switching circuit, connected to the battery protection circuit and the battery, is used to conduct the path between the battery and the battery protection circuit after receiving the power supply control signal, so as to short-circuit the load detection circuit; A coupling circuit is connected to the power supply terminal of the switching circuit and the battery protection circuit. It is used to process the power signal output by the battery, generate a second power supply signal, short-circuit the load detection circuit, and input the second power supply signal to the power supply terminal of the battery protection circuit to power the battery protection circuit. A unidirectional conduction circuit is connected to the battery protection circuit and the load detection circuit, and is used to control the first power supply signal to flow from the load detection circuit to the battery protection circuit.
2. The battery system according to claim 1, characterized in that, When the battery is not connected to the external electronic device, the load detection circuit stops outputting the first power supply signal, the battery protection circuit is in a non-working state, and the switching circuit is in an open state.
3. The battery system according to claim 1, characterized in that, The battery includes a cell and a power supply terminal. The cell is used to generate a power signal, and the power supply terminal is used to connect to the external electronic device to supply power to the external electronic device.
4. The battery system according to claim 3, characterized in that, The power supply terminal includes a first power supply terminal and a second power supply terminal. The load detection circuit is connected to the first power supply terminal and the battery cell, and is used to detect the resistance value of the external electronic device disposed between the first power supply terminal and the second power supply terminal. When the resistance value of the external electronic device is less than a first preset value, the first power supply signal is generated.
5. The battery system of claim 4, wherein, The load detection circuit includes: A first resistor, one end of which is connected to the first power supply terminal; A second resistor, one end of which is connected to the other end of the first resistor, and the other end of which is connected to the output terminal of the battery cell; The first switching transistor has its first end connected to the output end of the battery cell, its second end connected to the other end of the first resistor, and its third end connected to the battery protection circuit.
6. The battery system according to claim 5, characterized in that, When the resistance of the external electronic device is less than the first preset value, the first switch is turned on to open the path between the battery protection circuit and the output terminal of the battery cell. When the resistance of the external electronic device is greater than the first preset value, the first switch is turned off to close the path between the battery protection circuit and the output terminal of the battery cell. The first preset value is related to the resistance of the first resistor, the resistance of the second resistor, the threshold voltage of the first switch, and the supply voltage of the battery.
7. The battery system according to claim 4, characterized in that, The first preset value is greater than the input impedance of the external electronic device when the power supply terminal is connected to the external electronic device; the switching circuit includes a second switching transistor, which is connected to the control terminal of the battery protection circuit, the first power supply terminal, and the output terminal of the battery cell.
8. A power saving method of a battery system, characterized by, The method is applied to the battery system according to any one of claims 1-7, the battery system comprising a battery, a load detection circuit, a battery protection circuit, and a switching circuit, the method comprising: After the load detection circuit detects that the battery is connected to an external electronic device, it generates a first power supply signal. The battery protection circuit is in a working state after receiving the first power supply signal, and generates a power supply control signal. Upon receiving the power supply control signal, the switching circuit connects the battery and the battery protection circuit, thereby short-circuiting the load detection circuit.