Battery cell voltage detection circuit and electronic equipment
By setting up a voltage detection device on the motherboard and electrically connecting it to the battery cell, the battery cell voltage is directly detected, which solves the problem of low cell voltage accuracy caused by abnormality in the protection chip detection module, and achieves higher cell voltage detection accuracy and lower power consumption.
Patent Information
- Application Number
- CN202421375089.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-17
- Publication Date
- 2025-06-20
- Estimated Expiration
- 2034-06-17
AI Technical Summary
When detecting the battery voltage of an electronic device, the protection chip detects the module of the battery voltage or the interaction between the protection chip and the motherboard is abnormal, resulting in the accuracy of the battery voltage received by the motherboard.
Set up a voltage detection device on the motherboard and electrically connect it to the positive and negative electrodes of the battery cell, so that the motherboard can directly detect the battery cell voltage and avoid abnormal effects of the protection chip.
By directly detecting the battery voltage, the accuracy of the battery voltage received by the motherboard is improved, the anti-interference ability is enhanced, and the frequent interaction between the protection chip and the motherboard is reduced, and power consumption is reduced.
Smart Images
Figure CN223006276U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of voltage detection, and in particular, to a cell voltage detection circuit and an electronic device. Background Art
[0002] Currently, when detecting the voltage of a cell in an electronic device, the cell voltage is usually detected by a protection chip and then the detected cell voltage is fed back to the main board by the protection chip. In this case, if the module for detecting the cell voltage by the protection chip is abnormal, or the interaction between the protection chip and the main board is abnormal, the accuracy of the cell voltage received by the main board will be low. Utility Model Content
[0003] This application discloses a cell voltage detection circuit and an electronic device, which can improve the accuracy of the cell voltage received by the main board.
[0004] In a first aspect, an embodiment of this application discloses a cell voltage detection circuit, including: a voltage detection device and a main board, where: the voltage detection device is disposed on the main board; a first end of the voltage detection device is electrically connected to a positive electrode of a cell, and a second end of the voltage detection device is electrically connected to a negative electrode of the cell.
[0005] In a second aspect, an embodiment of this application discloses an electronic device, including a cell and the cell voltage detection circuit described in the first aspect, and the cell voltage detection circuit is electrically connected to the cell.
[0006] An embodiment of this application provides a cell voltage detection circuit, which includes a voltage detection device and a main board. The voltage detection device is disposed on the main board. A first end of the voltage detection device is electrically connected to a positive electrode of a cell, and a second end of the voltage detection device is electrically connected to a negative electrode of the cell. By disposing the voltage detection device on the main board and electrically connecting the voltage detection device to the cell, this application enables the main board to directly detect the cell voltage, thereby improving the accuracy of the cell voltage received by the main board. Description of the Drawings
[0007] Figure 1 is a schematic structural diagram of a cell voltage detection circuit disclosed in an embodiment of this application;
[0008] Figure 2 is a schematic structural diagram of another cell voltage detection circuit disclosed in an embodiment of this application;
[0009] Figure 3 is a schematic structural diagram of yet another cell voltage detection circuit disclosed in an embodiment of this application. Detailed Embodiments
[0010] Next, the technical solutions in the embodiments of the present application will be clearly described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.
[0011] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same category, and do not limit the number of objects. For example, the first object can be one or multiple. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means an "or" relationship between the associated objects before and after.
[0012] The present application discloses a cell voltage detection circuit and an electronic device. Figure 1 It is a schematic structural diagram of a cell voltage detection circuit disclosed in an embodiment of the present application.
[0013] As Figure 1 shown, the cell voltage detection circuit disclosed in the present application includes a voltage detection device 120 and a main board 130, wherein: the voltage detection device 120 is disposed on the main board 130; the first end of the voltage detection device 120 is electrically connected to the positive electrode of the cell 110, and the second end of the voltage detection device 120 is electrically connected to the negative electrode of the cell 110.
[0014] In the present application, by disposing the voltage detection device 120 on the main board 130 and electrically connecting the voltage detection device 120 to the cell 110, the main board 130 can directly detect the cell voltage. In this case, even if the module for detecting the cell voltage of the protection chip is abnormal, or the interaction between the protection chip and the main board is abnormal, it will not affect the accuracy of the cell voltage received by the main board 130. Furthermore, the accuracy of the cell voltage received by the main board 130 can be improved, and it is more stable and anti-interference. Moreover, by using the solution disclosed in the present application for cell voltage detection, the frequent interaction between the protection chip and the main board can be avoided, and thus the power consumption can be reduced.
[0015] Exemplarily, the first end of the voltage detection device 120 can be the positive electrode of the voltage detection device 120, and the second end of the voltage detection device 120 can be the negative electrode of the voltage detection device 120. The voltage detection device 120 can be a voltmeter or other devices capable of realizing voltage detection. The negative electrode of the voltage detection device 120 can be electrically connected to the negative electrode of the main board 130.
[0016] An embodiment of the present application provides a battery cell voltage detection circuit. The battery cell voltage detection circuit includes a voltage detection device 120 and a main board 130. The voltage detection device 120 is disposed on the main board 130. A first end of the voltage detection device 120 is electrically connected to the positive electrode of the battery cell 110, and a second end of the voltage detection device 120 is electrically connected to the negative electrode of the battery cell 110. By disposing the voltage detection device 120 on the main board 130 and electrically connecting the voltage detection device 120 to the battery cell 110, the main board 130 can directly detect the battery cell voltage, thereby improving the accuracy of the battery cell voltage received by the main board 130.
[0017] In one implementation, as Figure 2 shown, the battery cell voltage detection circuit may further include a resistor device 140. The first end of the voltage detection device 120 being electrically connected to the positive electrode of the battery cell 110 may include: a first end of the resistor device 140 being electrically connected to the positive electrode of the battery cell 110, and a second end of the resistor device 140 being electrically connected to the first end of the voltage detection device 120. By disposing the resistor device 140 between the positive electrode of the battery cell 110 and the first end of the voltage detection device 120, the resistor device 140 is used to limit the current, which can prevent current from flowing from the voltage detection device 120 to the battery cell 110, thereby avoiding affecting the battery cell 110.
[0018] In a possible implementation, the resistor device 140 may include a positive temperature coefficient thermistor. That is, the resistor device 140 may be a positive temperature coefficient (PTC) thermistor. Since the impedance of the PTC thermistor can change with the current, and the greater the current, the greater the impedance of the PTC thermistor, therefore, it can better limit the current and prevent current from flowing from the voltage detection device 120 to the battery cell 110.
[0019] In another possible implementation, as Figure 3 shown, the resistor device 140 may include a second resistor R2 and a third resistor R3, where: a first end of the second resistor R2 is electrically connected to the positive electrode of the battery cell 110, and a second end of the second resistor R2 is electrically connected to the first end of the voltage detection device 120; a first end of the third resistor R3 is electrically connected to the first end of the second resistor R2, and a second end of the third resistor R3 is electrically connected to the second end of the second resistor R2. That is to say, the parallel-connected second resistor R2 and third resistor R3 are used as the resistor device 140 and disposed between the positive electrode of the battery cell 110 and the first end of the voltage detection device 120 for current limiting. In this case, if one of the second resistor R2 and the third resistor R3 fails, the circuit can still operate normally through the other one of the second resistor R2 and the third resistor R3.
[0020] It should be noted that the resistance device 140 may also be composed of three, four, five or more resistors connected in parallel, and the present application does not make specific limitations on this.
[0021] In one implementation, as Figure 2 shown, the cell voltage detection circuit may further include a first on-off device 150 and a control device 160. The first end of the resistance device 140 is electrically connected to the positive electrode of the cell 110, and may include: the first end of the first on-off device 150 is electrically connected to the positive electrode of the cell 110, the second end of the first on-off device 150 is electrically connected to the first end of the resistance device 140, and the control end of the first on-off device 150 is electrically connected to the control device 160. By providing the first on-off device 150 between the positive electrode of the cell 110 and the first end of the resistance device 140, and controlling the electrical connection between the first end and the second end of the first on-off device 150 to be conducted or disconnected by the control device 160, the connection or disconnection between the positive electrode of the cell 110 and the first end of the resistance device 140 is further achieved. When it is necessary to detect the cell voltage, the control device 160 controls the electrical connection between the first end and the second end of the first on-off device 150 to be conducted, so that the positive electrode of the cell 110 is electrically connected to the first end of the resistance device 140, and further the voltage detection device 120 is electrically connected to the positive electrode of the cell 110 to realize cell voltage detection; when it is not necessary to detect the cell voltage, the control device 160 controls the electrical connection between the first end and the second end of the first on-off device 150 to be disconnected, so that the positive electrode of the cell 110 is disconnected from the first end of the resistance device 140, and further the voltage detection device 120 is disconnected from the positive electrode of the cell 110.
[0022] In another implementation, the battery cell voltage detection circuit may further include a first switching device 150 and a control device 160. The first end of the voltage detection device 120 is electrically connected to the positive electrode of the battery cell 110, and may include: the first end of the first switching device 150 is electrically connected to the positive electrode of the battery cell 110, the second end of the first switching device 150 is electrically connected to the first end of the voltage detection device 120, and the control end of the first switching device 150 is electrically connected to the control device 160. By providing the first switching device 150 between the positive electrode of the battery cell 110 and the first end of the voltage detection device 120, and controlling the electrical connection between the first end and the second end of the first switching device 150 to be conducted or disconnected by the control device 160, the connection or disconnection between the positive electrode of the battery cell 110 and the first end of the voltage detection device 120 is achieved. When it is necessary to detect the battery cell voltage, the control device 160 controls the electrical connection between the first end and the second end of the first switching device 150 to be conducted, so that the positive electrode of the battery cell 110 is electrically connected to the first end of the voltage detection device 120 to realize battery cell voltage detection; when it is not necessary to detect the battery cell voltage, the control device 160 controls the electrical connection between the first end and the second end of the first switching device 150 to be disconnected, so that the positive electrode of the battery cell 110 is disconnected from the first end of the voltage detection device 120.
[0023] In the present application, the control device 160 can obtain the current and voltage on the main board 130. When the control device 160 determines that there are abnormal current and voltage on the main board 130, the control device 160 controls the electrical connection between the first end and the second end of the first switching device 150 to be disconnected to protect the battery cell 110.
[0024] In the embodiment of the present application, the first switching device 150 can be a metal oxide semiconductor field effect transistor (MOS) or a triode.
[0025] In one implementation, the control device 160 can be disposed on the main board 130. That is to say, the control of the first switching device 150 can be realized by the control device 160 on the main board 130.
[0026] In another implementation, such as Figure 3As shown, the battery cell voltage detection circuit may further include a second switching device 170, and the control device 160 may include a protection chip 161, where: the positive battery cell voltage monitoring pin Vcell+ of the protection chip 161 is electrically connected to the positive electrode of the battery cell 110, the negative battery cell voltage monitoring pin Vcell- of the protection chip 161 is electrically connected to the negative electrode of the battery cell 110, the charge control pin CO of the protection chip 161 is electrically connected to the control end of the second switching device 170, the first end of the second switching device 170 is electrically connected to the positive electrode of the battery cell 110, and the second end of the second switching device 170 is electrically connected to the positive electrode of the main board 130; the control end of the first switching device 150 is electrically connected to the control device 160, and may include: the control end of the first switching device 150 is electrically connected to the charge control pin CO. That is to say, the conduction or disconnection of the electrical connection between the first end and the second end of the first switching device 150 is controlled by the charge control pin CO of the protection chip 161. In the initial situation, both the first switching device 150 and the second switching device 170 are in the conducting state. When the protection chip 161 performs charge protection based on the detected battery cell voltage, the charge control pin CO of the protection chip 161 outputs a control signal, and at the same time controls the disconnection of the electrical connection between the first end and the second end of the first switching device 150 and the disconnection of the electrical connection between the first end and the second end of the second switching device 170, to achieve synchronous protection and improve the safety of the circuit. Exemplarily, the second switching device 170 may be a MOS for controlling charging.
[0027] In addition, the ground pin GND of the protection chip 161 is electrically connected to the negative electrode of the battery cell 110, the discharge control pin DO of the protection chip 161 is electrically connected to the control end of the discharge MOS, the first end of the discharge MOS is electrically connected to the second end of the second switching device 170, the second end of the discharge MOS is electrically connected to the positive electrode of the main board 130, and the communication data pin SDA and the communication clock pin SCL of the protection chip 161 are electrically connected to the main board 130. When the device using the above circuit is in the standby state, the protection chip 161 can control the disconnection of the electrical connection between the first end and the second end of the discharge MOS, thereby reducing power consumption.
[0028] In one implementation, as Figure 2 and Figure 3 shown, the battery cell voltage detection circuit may further include a capacitor device 180. The first end of the capacitor device 180 is electrically connected to the first end of the first switching device 150, and the second end of the capacitor device 180 is electrically connected to the second end of the first switching device 150. By setting the capacitor device 180, electrostatic discharge (ESD) protection for the first switching device 150 is achieved.
[0029] Exemplarily, as Figure 3 shown, the capacitor device 180 may include a first capacitor C1 and a second capacitor C2, and the first capacitor C1 and the second capacitor C2 are connected in series. In this case, if one of the first capacitor C1 and the second capacitor C2 fails, the circuit can still operate normally through the other one of the first capacitor C1 and the second capacitor C2.
[0030] It should be noted that the capacitor device 180 may also be composed of a single capacitor, or the capacitor device 180 may also be composed of three, four, five or more capacitors connected in series. The present application does not make specific limitations on this.
[0031] In one implementation, as Figure 2 and Figure 3 shown, the battery cell voltage detection circuit may further include a first resistor R1. The control end of the first on-off device 150 is electrically connected to the control device 160, and may include: the control end of the first on-off device 150 is electrically connected to the first end of the first resistor R1, and the second end of the first resistor R1 is electrically connected to the control device 160. That is to say, a first resistor R1 is provided between the control device 160 and the control end of the first on-off device 150 to limit the current through the first resistor R1, preventing the current from flowing into the control device 160 through the first on-off device 150 and affecting the control device 160.
[0032] An embodiment of the present application also discloses an electronic device, including a battery cell 110 and the battery cell voltage detection circuit described above, and the battery cell voltage detection circuit is electrically connected to the battery cell 110.
[0033] It should be noted that the specific connection manner between the battery cell voltage detection circuit and the battery cell 110 is the same as above, and the present application will not repeat it here.
[0034] In the above embodiments of the present application, the differences between the various embodiments are mainly described. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a more optimal embodiment. Considering the simplicity of the writing, it will not be repeated here.
[0035] The above are only the embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application may have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.
Claims
1. A cell voltage detection circuit, characterized in that: include: A voltage detection device and a main board, wherein: The voltage detection device is arranged on the main board; The first end of the voltage detection device is electrically connected to the positive electrode of the battery cell, and the second end of the voltage detection device is electrically connected to the negative electrode of the battery cell.
2. The cell voltage detection circuit according to claim 1, characterized in that: A resistor device is also included, and the first end of the voltage detection device is electrically connected to the positive electrode of the battery cell, including: The first end of the resistor device is electrically connected to the positive electrode of the battery cell, and the second end of the resistor device is electrically connected to the first end of the voltage detection device.
3. The cell voltage detection circuit according to claim 2, characterized in that: It also includes a first on-off device and a control device, wherein the first end of the resistor is electrically connected to the positive electrode of the battery cell, including: The first end of the first on-off device is electrically connected to the positive electrode of the battery cell, the second end of the first on-off device is electrically connected to the first end of the resistor device, and the control end of the first on-off device is electrically connected to the control device.
4. The cell voltage detection circuit according to claim 3, characterized in that: The control device is arranged on the main board.
5. The cell voltage detection circuit according to claim 3, characterized in that: It also includes a second on-off device, and the control device includes a protection chip, wherein: The cell voltage positive electrode monitoring pin of the protection chip is electrically connected to the positive electrode of the cell, the cell voltage negative electrode monitoring pin of the protection chip is electrically connected to the negative electrode of the cell, the charging control pin of the protection chip is electrically connected to the control end of the second on-off device, the first end of the second on-off device is electrically connected to the positive electrode of the cell, and the second end of the second on-off device is electrically connected to the positive electrode of the mainboard; The control end of the first on-off device is electrically connected to the control device, including: the control end of the first on-off device is electrically connected to the charging control pin.
6. The cell voltage detection circuit according to any one of claims 3 to 5, characterized in that: It also includes a capacitor device, a first end of the capacitor device is electrically connected to the first end of the first switching device, and a second end of the capacitor device is electrically connected to the second end of the first switching device.
7. The cell voltage detection circuit according to any one of claims 3 to 5, characterized in that: The device further comprises a first resistor, wherein the control end of the first on-off device is electrically connected to the control device, and comprises: The control end of the first switching device is electrically connected to the first end of the first resistor, and the second end of the first resistor is electrically connected to the control device.
8. The cell voltage detection circuit according to claim 2, characterized in that: The resistor device includes a positive temperature coefficient thermistor.
9. The cell voltage detection circuit according to claim 2, characterized in that: The resistor device comprises a second resistor and a third resistor, wherein: The first end of the second resistor is electrically connected to the positive electrode of the battery cell, and the second end of the second resistor is electrically connected to the first end of the voltage detection device; A first end of the third resistor is electrically connected to a first end of the second resistor, and a second end of the third resistor is electrically connected to a second end of the second resistor.
10. An electronic device, characterized in that: It comprises a battery cell and a battery cell voltage detection circuit according to any one of claims 1 to 9, wherein the battery cell voltage detection circuit is electrically connected to the battery cell.