CN112271772A

CN112271772A - Battery protection circuit, battery pack, test system and electronic device

Info

Publication number: CN112271772A
Application number: CN202011105770.4A
Authority: CN
Inventors: 宋利军; 徐丹蓉
Original assignee: Xi'an Wenxian Semiconductor Technology Co ltd
Current assignee: Xi'an Wenxian Semiconductor Technology Co ltd
Priority date: 2020-10-15
Filing date: 2020-10-15
Publication date: 2021-01-26
Anticipated expiration: 2040-10-15
Also published as: CN112271772B

Abstract

The application provides a battery protection circuit, includes: the battery protection circuit comprises a power supply end, a power grounding end, an over-discharge voltage protection unit, a control unit, a first resistor, a first switch unit, a first test welding point and a second test welding point, and further comprises a first test welding point and a second test welding point which are electrically grounded, wherein the first test welding point and the second test welding point are electrically connected with the test unit, and are conducted when the first test welding point and the second test welding point are electrically connected with the test unit, so that a voltage signal received by the power supply end is lower than a preset threshold voltage, and therefore the battery protection circuit enters a sleep mode. The application also provides a battery pack, a test subsystem, a test system and an electronic device. The application has the advantages that: the current consumption of the battery in the transportation and storage processes can be reduced, the electric quantity retention time of the battery is prolonged, and the user experience is improved.

Description

Battery protection circuit, battery pack, test system and electronic device

Technical Field

The present application relates to the field of battery technologies, and in particular, to a battery protection circuit, a battery pack, a test subsystem, a test system, and an electronic device.

Background

The battery assembly is widely applied to electronic devices, such as bluetooth headsets, mobile phones, tablet computers and the like, so as to provide a more flexible use environment for the electronic devices without being limited by the range of sockets and power supply wires. Generally, a battery assembly includes a bare cell, a battery protection circuit electrically connected to the bare cell to prevent the bare cell from being overcharged or overdischarged.

After the electronic device with the battery pack is manufactured in a production place, the electronic device is shut down after the battery pack is charged with preset electric quantity, then the electronic device is transported and stored for a long time, and finally when an end user takes the electronic device for use for the first time, the electronic device is completely discharged due to internal current consumption due to long-time transportation and storage, so that the end user has to charge the electronic device before the end user uses the electronic device for the first time to recover the electric quantity, and the experience of the user is poor.

Disclosure of Invention

The present disclosure provides a battery protection circuit, a battery pack, a test subsystem, a test system, and an electronic device. After the battery pack is assembled, the battery pack is charged with preset electric quantity to enter a dormant state, the battery is powered off, current consumption of the battery in the transportation and storage processes can be reduced, electric quantity keeping time of the battery is prolonged, and user experience is improved.

In order to solve the above technical problem, a first aspect of an embodiment of the present application provides a battery protection circuit, including: the power supply protection circuit comprises a power supply end, a power grounding end, an over-discharge voltage protection unit, a control unit, a first resistor, a first switch unit, a first test welding spot and a second test welding spot, wherein the power supply end and the power grounding end are respectively used for being electrically connected with a battery;

the first test welding spot is electrically connected with the power supply end, the second test welding spot is electrically grounded, the first test welding spot and the second test welding spot are electrically connected with the test unit, when the first test welding spot and the second test welding spot are electrically connected with the test unit, the first test welding spot and the second test welding spot are conducted to cause a voltage signal received by the power supply end to be lower than a preset threshold voltage, so that the battery protection circuit enters a sleep mode, when the sleep mode is performed, the first switch unit is switched off to enable the battery to stop supplying power to the system circuit, and at least part of circuits of the battery protection circuit are stopped supplying power.

Optionally, the battery protection circuit further includes a wake-up unit, the wake-up unit is powered when in the sleep mode, and the wake-up unit is configured to enable the battery protection circuit to exit the sleep mode.

Optionally, the first test welding spot is directly electrically connected with a power supply end of a power supply; or a second resistor is arranged between the first test welding spot and the power supply end of the power supply to be indirectly electrically connected.

Optionally, the second test pad is directly grounded; or a second resistor is arranged between the second test welding spot and the ground for indirect electric connection.

Optionally, the over-discharge voltage protection unit is electrically connected to the power supply end, when a voltage signal of the power supply end is lower than a threshold voltage, the discharge protection unit controls the battery protection circuit to enter a sleep mode, and in the sleep mode, the first switch unit is turned off, and at least part of circuits of the battery protection circuit is powered off.

Optionally, the wake-up unit is a charging detection unit. When the charging detection unit detects a charging signal, the battery protection circuit exits the sleep mode.

Optionally, the battery protection circuit further includes an overcharge voltage protection unit, a discharge overcurrent protection unit, a reference voltage generation unit, and a frequency generation unit, wherein at least one of the overcharge voltage protection unit, the overdischarge voltage protection unit, the discharge overcurrent protection unit, the control unit, the reference voltage generation unit, and the frequency generation unit is powered off in the sleep mode.

Optionally, when the battery protection circuit enters the sleep mode, the circuits of the battery protection circuit except for the wake-up unit are all powered off.

Optionally, the first switching unit includes a MOS transistor.

Optionally, the battery protection circuit is fabricated on the same chip, or all units of the battery protection circuit except the first switch unit are fabricated on the same chip.

A second aspect of embodiments of the present application provides a battery pack, including:

a battery;

in the battery protection circuit, the power supply end and the power ground end of the battery protection circuit are respectively electrically connected with the battery.

Optionally, the capacity of the battery is 10mAH-80 mAH.

A third aspect of the embodiments of the present application provides a test subsystem, including:

the battery protection circuit described above;

and the two ends of the test unit are electrically connected with the first test welding point and the second test welding point, when the two ends of the test unit are electrically connected with the first test welding point and the second test welding point, the first test welding point and the second test welding point are conducted, so that a voltage signal received by a power supply end of the battery protection circuit is lower than a preset threshold voltage, the battery protection circuit enters a sleep mode, and when the battery protection circuit is in the sleep mode, the first switch unit is switched off, so that the battery stops supplying power to a system circuit, and at least part of circuits of the battery protection circuit are stopped supplying power.

Optionally, the test unit is a wire, and a second resistor is disposed between the first test pad and the power supply terminal.

Optionally, the test unit is a wire, and a second resistor is disposed between the second test pad and the ground.

Optionally, the test unit is a wire and a second resistor, and the second resistor is arranged between the first test pad and the second test point.

A fourth aspect of the embodiments of the present application provides a test system, including:

a battery pack having a plurality of batteries,

in the test subsystem, a power supply end and a power supply ground end of the battery protection circuit in the test subsystem are electrically connected to the battery respectively.

Optionally, the capacity of the battery is 10mAH-80 mAH.

A fifth aspect of embodiments of the present application provides an electronic apparatus, including:

the above battery module;

system circuitry, wherein the battery controls power to the system circuitry via the battery protection circuitry.

The embodiment of the application has the following beneficial effects: the battery protection circuit further comprises a first test welding point and a second test welding point which are used for being electrically connected with the test unit, when the first test welding point and the second test welding point are used for being electrically connected with the test unit, the first test welding point and the second test welding point are conducted, so that a voltage signal received by a power supply end of a power supply is lower than a preset threshold voltage, the battery protection circuit enters a sleep mode, when the sleep mode is carried out, the first switch unit is switched off, so that the battery stops supplying power to a system circuit, and at least part of circuits of the battery protection circuit are stopped supplying power.

In the sleep mode, at least part of the units of the battery protection circuit are stopped to supply power, so that the power consumption of the battery is reduced, the current consumption of the electronic device can be reduced, the power retention time of the battery can be prolonged, after a user takes the electronic device, the user only needs to operate the awakening unit to enable the battery protection circuit to exit the sleep mode, the electronic device can be normally used when being started, and the user experience is improved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic circuit block diagram of an electronic device according to an embodiment of the present application;

fig. 2 is a schematic circuit block diagram of a battery protection circuit according to an embodiment of the present application;

FIG. 3 is a schematic circuit block diagram of an electronic device according to another embodiment of the present application;

FIG. 4 is a schematic circuit block diagram of an electronic device according to another embodiment of the present application;

description of the figure numbers:

100-battery protection circuit; VDD-power supply terminal; GND-power ground; VM-System ground; 110-an overcharge voltage protection unit; 120-charging overcurrent protection unit; 130-discharge overcurrent protection unit; 140-reference voltage generating unit; 150-a frequency generation unit; 160-a control unit; 170-a wake-up unit; 180-a first switching unit; 190-an over-discharge voltage protection unit; 191-a comparator; 410-a temperature protection unit; 200-system circuitry; 300-a battery; r1 — first resistance; r2 — second resistance; a-a first test point; b-a first test point; c-capacitance.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "comprising" and "having," and any variations thereof, as appearing in the specification, claims and drawings of this application, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or modules is not limited to the listed steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. Furthermore, the terms "first," "second," and "third," etc. are used to distinguish between different objects and are not used to describe a particular order.

The embodiment of the application provides an electronic device, and the electronic device is a bluetooth headset, a mobile phone, a tablet computer and the like. Referring to fig. 1, the electronic device includes a battery assembly and a system circuit 200, the system circuit 200 is a circuit composed of a microprocessor, a camera driving circuit, an image processor, and the like, the system circuit 200 is electrically connected to the battery assembly, and the battery assembly is used for supplying power to the system circuit 200. The battery assembly includes a battery 300 and a battery protection circuit 100, the battery protection circuit 100 is electrically connected to the positive and negative electrodes of the battery 300, the system circuit 200 is electrically connected to the battery protection circuit 100, the battery 300 supplies power to the battery protection circuit 100, and the battery protection circuit 100 plays a role in protection, for example, when the battery 300 is overcharged or overdischarged, since how the battery protection circuit 100 protects the battery 300 from overcharge and overdischarge is a common technical measure in the art, it is not described herein again. In the present embodiment, the number of the battery 300 is one or more, and when the number of the battery 300 is plural, the plural batteries 300 may be connected in parallel or in series or in parallel, and may be mixed, the battery 300 is preferably a lithium battery 300, the capacity of the battery 300 is 10mAH to 80mAH, for example, 10mAH, 20mAH, 30mAH, 40mAH, 50mAH, 60mAH, 70mAH, and 80mAH, the size of the battery 300 with such a capacity is smaller, and preferably, the capacity of the battery 300 is 20mAH to 40mAH, and then the size of the battery 300 is smaller, and the battery can be conveniently configured in a small electronic device, for example, a bluetooth headset. Furthermore, since the capacity of the battery 300 is so small, how the amount of electricity of the battery 300 is maintained for a long time becomes an important issue. In this embodiment, a first resistor R1 and a capacitor C are further disposed between the battery 300 and the battery protection circuit 100, and the first resistor R1 and the capacitor C are disposed for filtering. In addition, in other embodiments of the present application, the capacitor C may not be provided between the battery 300 and the battery protection circuit 100. In addition, in other embodiments of the present application, other circuits or electronic elements may be disposed between the battery 300 and the battery protection circuit 100.

In the present embodiment, referring to fig. 1 and fig. 2 in combination, the battery protection circuit 100 includes a power supply terminal VDD, a power ground terminal GND, an overcharge protection unit 110, an overdischarge protection unit 190, a discharge overcurrent protection unit 130, a reference voltage generation unit 140, a frequency generation unit 150, a control unit 160, a wake-up unit 170, and a first switch unit 180.

In this embodiment, the power supply terminal VDD and the power ground terminal GND are respectively used for electrically connecting with the positive electrode and the negative electrode of the battery 300, so that the battery 300 can supply power to the battery protection circuit 100, and meanwhile, the battery 300 forms a loop via the battery protection circuit 100 and the system circuit 200 to supply power to the system circuit 200.

In the embodiment, the overcharge voltage protection unit 110 is used to protect the battery 300 when detecting that the charge voltage is too high during the charging process of the battery 300, for example, stopping charging the battery 300, and so on, so as to prevent the battery 300 from being damaged or causing safety problems.

In the embodiment, the over-discharge voltage protection unit 190 is used for protecting the battery 300 when detecting that the discharge voltage is too low during the discharge process of the battery 300, for example, controlling the battery 300 to discharge only to the minimum extent, and generally stopping the power supply to the system circuit 200 and stopping the power supply to the circuits of the battery protection circuit 100 except the charge detection circuit, so as to prevent the battery 300 from being over-discharged and causing permanent damage to the battery 300.

In the embodiment, the discharge overcurrent protection unit 130 is used for protecting the battery 300 when detecting that the discharge current is too large during the discharge of the battery 300, for example, the battery 300 stops discharging, and the like, so as to prevent the battery 300 from being permanently damaged or causing a safety problem due to the too large discharge current. In the present embodiment, the discharge overcurrent protection unit 130 includes a plurality of sub-units, each of which is electrically connected to the control unit 160, and each of which is used for processing different discharge currents, and three sub-units are provided in the figure.

In the present embodiment, the reference voltage generating unit 140 is configured to generate a reference voltage required by the battery protection circuit 100, the frequency generating unit 150 is configured to generate different frequencies, and the control unit 160 is electrically connected to the overcharge voltage protection unit 110, the overdischarge voltage protection unit 190, the discharge overcurrent protection unit 130, the reference voltage generating unit 140, the frequency generating unit 150, the wake-up unit 170, the first switch unit 180, and the like. In this embodiment, the overcharge voltage protection unit 110, the overdischarge voltage protection unit 190, the discharge overcurrent protection unit 130, the reference voltage generation unit 140, the frequency generation unit 150, and the control unit 160 are conventional circuits in the art, and are not described herein again.

In the present embodiment, the wake-up unit 170 is a charging detection unit for detecting whether the electronic device is connected to a power source through a charger to charge the battery 300, and when the electronic device is connected to the power source through the charger, the charging detection unit detects a charging signal to charge the battery 300. In this embodiment, if the over-discharge voltage protection unit 190 protects the battery 300, and the charging detection unit detects the charging signal at this time, the over-discharge voltage protection of the battery 300 is exited, that is, the system circuit 200 is normally powered again and the battery protection circuit 100 is normally powered.

In this embodiment, the first switch unit 180 includes a switch transistor and a substrate control circuit, the switch transistor is an MOS transistor, a control end of the switch transistor is electrically connected to the control unit 160, the substrate control circuit is electrically connected to the control unit 160, and the substrate control circuit is configured to implement correct bias of a substrate of the switch transistor. However, the present application is not limited thereto, and in other embodiments of the present application, the first switch unit 180 may further include a charge switch and a discharge switch, where the charge switch and the discharge switch are both MOS transistors, and the charge switch and the discharge switch are respectively electrically connected to the control unit 160. In addition, in other embodiments of the present application, the first switch unit 180 may also be implemented in other forms, such as only one switch tube. In this embodiment, the first switch unit 180 is used to control the battery 300 to supply power to the system circuit 200, specifically, a loop is formed by the battery 300, the system circuit 200, and the first switch unit 180 of the battery protection circuit 100 to supply power to the battery protection circuit 100. Specifically, the control terminal of the first switch unit 180 is electrically connected to the control unit 160, the input terminal of the first switch unit 180 is electrically connected to the battery 300, for example, electrically connected to the power ground GND of the battery protection circuit 100, and the output terminal of the first switch unit 180 is electrically connected to the system circuit 200, so that the battery 300, the battery protection circuit 100, and the first switch unit 180 form a power supply loop, and the battery protection circuit 100 can control whether the battery 300 supplies power to the system circuit 200 by controlling the on/off of the first switch unit 180.

In the present embodiment, please refer to fig. 1 and fig. 2, the power supply terminal VDD is electrically connected to the first test pad a through the second resistor R2, so that when the first test pad a and the second test pad B are short-circuited, the output of the battery 300 is divided into two branches from the power supply terminal VDD, one branch enters the battery protection circuit 100 through the power supply terminal VDD, and the other branch causes the voltage signal of the power supply terminal VDD to change along with the branch via the power supply terminal VDD and the second resistor R2. When the voltage of the power supply terminal VDD is less than the overdischarge protection voltage and the time exceeds the overdischarge delay time, the battery protection circuit 100 performs a sleep mode, and in the sleep mode, the first switch unit 180 is turned off to stop the battery 300 from supplying power to the system circuit 200, and at least a part of the battery protection circuit 100 stops supplying power.

In the present embodiment, the wake-up unit 170 is continuously powered by the battery 300 during the sleep mode, and the wake-up unit 170 is configured to enable the battery protection circuit 100 to exit the sleep mode. In this embodiment, since the wake-up unit 170 is a charging detection circuit, which is originally the circuit of the battery protection circuit 100, the design can save the cost. In this embodiment, when the electronic device is charged, the charging detection circuit detects the charging signal, and the battery protection circuit 100 automatically exits the sleep mode, so that the electronic device can be normally powered on for use because the power of the battery 300 can be maintained for a long time. In addition, in other embodiments of the present application, the wake-up unit 170 may not be a charging detection circuit, but may also be another newly added hardware circuit dedicated to enabling the battery protection circuit 100 to exit the sleep mode, and a person skilled in the art may design the circuit according to specific requirements.

In this embodiment, when the electronic device needs to be transported for a long distance or stored for a long time, the battery protection circuit 100 of the electronic device may enter a sleep mode, in the sleep mode, the first switch unit 180 is turned off, so that the battery 300 cannot supply power to the system circuit 200, and the power of the battery 300 may be greatly saved, and in the sleep mode, at least a part of the units of the battery protection circuit 100 is stopped to supply power, so that the battery 300 only needs to supply power to a few circuit units such as a wake-up circuit of the battery protection circuit 100, and the power consumption of the battery 300 is further reduced, so that the current consumption of the electronic device may be reduced, and the current consumption may be as low as several nA/h, so that the power retention time of the battery 300 may be prolonged, even if the capacity of the battery 300 itself is relatively small, the power of the battery 300 may be retained for half a year to one year in the, after the user takes the electronic device, the user can make the battery protection circuit 100 exit the sleep mode only by waking up the unit 170, and the electronic device can be normally used when being started, so that the user experience is improved, and the user is prevented from mistakenly considering the quality problem of the electronic device.

In the present embodiment, at least some of the units of the battery protection circuit 100 are powered off in the sleep mode. In the present embodiment, at least one of the overcharge voltage protection unit 110, the overdischarge voltage protection unit 190, the discharge overcurrent protection unit 130, the control unit 160, the reference voltage generation unit 140, and the frequency generation unit 150 of the battery protection circuit 100 is stopped from being supplied with power, for example, one of the overcharge voltage protection unit 110, the overdischarge voltage protection unit 190, the discharge overcurrent protection unit 130, the control unit 160, the reference voltage generation unit 140, and the frequency generation unit 150 is stopped from being supplied with power in a sleep mode, or two of the overcharge voltage protection unit 110, the overdischarge voltage protection unit 190, the discharge overcurrent protection unit 130, the control unit 160, the reference voltage generation unit 140, and the frequency generation unit 150 are stopped from being supplied with power in a sleep mode, or the overcharge voltage protection unit 110, the overdischarge voltage protection unit 190, the discharge overcurrent protection unit 130, the control unit 160, the reference voltage generation unit 140, and the frequency, Three of the control unit 160, the reference voltage generating unit 140, and the frequency generating unit 150 are stopped supplying power, …, or the overcharge voltage protecting unit 110, the overdischarge voltage protecting unit 190, the discharge overcurrent protecting unit 130, the control unit 160, the reference voltage generating unit 140, and the frequency generating unit 150 are all stopped supplying power in the sleep mode, at which time the consumption of the power of the battery 300 can be further reduced. In addition, in other embodiments of the present application, the battery protection circuit 100 further includes a temperature protection unit 410, a charging overcurrent protection unit 120, and the like, and the temperature protection unit 410 and the charging overcurrent protection unit 120 may not be powered or may be powered in the sleep mode, which is also a protection scope of the present application. In this embodiment, when the battery protection circuit 100 enters the sleep mode, the circuit units of the battery protection circuit 100 except the wake-up unit 170 are all powered off, that is, except for the wake-up unit 170 required by the battery protection circuit 100 to exit the sleep mode, other circuit units of the battery protection circuit 100 are not powered, so that the electric quantity of the battery 300 can be further saved, the consumption of the electric quantity of the battery 300 is reduced, the electric quantity retention time of the battery 300 is further prolonged, and especially the electric quantity retention time of the battery 300 with small capacity can be prolonged.

In this embodiment, there are several ways to realize that the voltage of the power supply terminal VDD is less than the over-discharge protection voltage, which will be described separately below. Of course, the manner of changing the voltage of the power supply terminal VDD by adding the test pad is not limited to the following, and those skilled in the art may also arrange other conventional circuits to implement the change of the voltage signal received by the power supply terminal VDD caused by the operation of the test pad.

Referring to fig. 1 and 2, in general, a conventional battery protection circuit 100 detects deep discharge of a battery 300 through an over-discharge voltage protection unit 190 when the battery 300 is deeply discharged, specifically, determines whether the battery 300 is deeply discharged by detecting whether a voltage at a power supply terminal VDD is lower than a preset threshold voltage, if the voltage is lower than the preset threshold voltage, the over-discharge voltage protection unit 190 determines that the battery 300 is in a deep discharge state, the over-discharge voltage protection unit 190 sends a signal to a control unit 160, the control unit 160 passively controls a first switching unit 180 to be turned off, and passively controls the battery protection circuit 100 except for a charge detection unit to be stopped to supply power for protecting the battery 300, preventing the battery 300 from being damaged due to the over-discharge, until the battery protection circuit 100 resumes supplying power after the charge detection unit detects a charge signal, the first switching unit 180 is turned off to restore power to the system circuit 200.

In an embodiment of the present application, the original circuits and functions of the over-discharge voltage protection unit 190 in the prior art are fully utilized to actively control the first switch unit 180 to be turned off, and actively control the battery protection circuit 100 except for the charge detection unit to be stopped supplying power, so that the power retention time of the battery 300 is prolonged, and the cost can be reduced. Referring to fig. 1, a first test pad a and a second test pad B are added to a battery protection circuit. And a second resistor is arranged between the first test welding spot A and the power supply end of the power supply so as to realize indirect electric connection, the second test welding spot B is electrically grounded, and the first test welding spot A and the second test welding spot B are used for being electrically connected with the test unit. In the embodiment, the test unit is a wire. When the first test welding point A and the second test welding point B are directly connected through the wires, the first test welding point A and the second test welding point B are conducted to cause a voltage signal received by a power supply end of a power supply to be lower than a preset threshold voltage, so that the battery protection circuit enters a sleep mode, and when the sleep mode is adopted, the first switch unit is switched off to stop the battery from supplying power to the system circuit, and at least part of circuits of the battery protection circuit are stopped supplying power. Specifically, in fig. 1, the output of the electric quantity of the battery 300 is divided into two branches from the power supply terminal VDD, one branch enters the battery protection circuit 100 via the power supply terminal VDD, and the other branch passes through the power supply terminal VDD and the second resistor R2. When the first test pad a and the second test pad B are short-circuited, the branch formed by the power supply terminal VDD and the second resistor R2 is turned on, and the resistance of the second resistor R2 is the same as that of the first resistor R1, so that the battery voltage is divided by the second resistor R2 and the first resistor R1, and the voltage signal received at the power supply terminal VDD is reduced, when the voltage of the power supply terminal VDD is smaller than the overdischarge protection voltage and the time exceeds the overdischarge delay time, the battery protection circuit 100 performs the sleep mode, and in the sleep mode, the first switch unit 180 is turned off to stop the battery 300 from supplying power to the system circuit 200, and at least part of the cells of the battery protection circuit 100 are stopped supplying power. In the present embodiment, the voltage of the battery is reduced to half, and half of the battery voltage is generally lower than the preset threshold voltage of the deep discharge setting, and generally speaking, the power supply voltage of the battery 300 is in the range of 2.8V to 4.2V, the threshold voltage of the deep discharge is generally 2.8V, and half of the battery voltage is in the range of 1.4V to 2.1V and is lower than the threshold voltage of the deep discharge. So that when the first test pad a and the second test pad B are turned on, second, the over-discharge voltage protection unit 190 detects that the voltage of the power supply terminal VDD is lower than the threshold voltage, at which time the over-discharge voltage protection unit 190 controls the first switching unit 180 to be turned off and controls other units of the circuit protection system 100 except for the charge detection unit to be stopped from being supplied with power. In general, the circuit protection system 100 has two protection modes for deep discharge: when the circuit protection system 100 is in the overdischarge recoverable mode, and the voltage of the power supply end VDD is detected by the overdischarge voltage protection unit 190 to be lower than a preset threshold voltage (for example, false detection), the first switch unit 180 is turned off, the circuit protection systems 100 except the charge detection unit are all powered off, when the voltage of the power supply end VDD is increased to be higher than the preset threshold voltage, the power supply of the circuit protection system 100 by the unit which is powered off is automatically recovered, and the first switch unit 180 is turned on; when the circuit protection system 100 is in the overdischarge unrecoverable mode, when the overdischarge voltage protection unit 190 detects that the voltage of the power supply terminal VDD is lower than the preset threshold voltage, the first switch unit 180 is turned off, and the circuit protection systems 100 except for the charge detection unit are all stopped supplying power, in this mode, even if the voltage at the power supply terminal VDD increases above the preset threshold voltage, the first switch unit 180 is still turned off, and the circuit protection systems 100 except for the charge detection unit continue to be stopped supplying power, in this case, only when the charge detection module detects the charge signal, the unit of the circuit protection system 100 which is stopped supplying power resumes supplying power, and the first switch unit 180 is turned on. In the present embodiment, the circuit protection system 100 operates in the overdischarge unrecoverable mode, at which time, the circuit protection system 100 except for the charge detection unit continues to be powered off, thereby facilitating the maintenance of the amount of electricity of the battery 300.

2. On the basis of the mode 1, in another embodiment of the present application, the original circuits and functions of the over-discharge voltage protection unit 190 in the prior art are fully utilized, so as to actively control the first switch unit 180 to be turned off, and actively control the battery protection circuit 100 except for the charge detection unit to be stopped supplying power, so that the power retention time of the battery 300 is prolonged, and meanwhile, the cost can be reduced, please refer to fig. 3. A first test pad A and a second test pad B are added to the battery protection circuit. The first test welding point A is directly and electrically connected with the power supply end of the power supply, the second resistor is arranged between the second test welding point and the ground, and the first test welding point A and the second test welding point B are used for being electrically connected with the test unit. In the embodiment, the test unit is a wire. When the first test welding point A and the second test welding point B are directly connected through the wires, the first test welding point A and the second test welding point B are conducted to cause a voltage signal received by a power supply end of a power supply to be lower than a preset threshold voltage, so that the battery protection circuit enters a sleep mode, and when the sleep mode is adopted, the first switch unit is switched off to stop the battery from supplying power to the system circuit, and at least part of circuits of the battery protection circuit are stopped supplying power. Specifically, in fig. 1, the output of the electric quantity of the battery 300 is divided into two branches from the power supply terminal VDD, one branch enters the battery protection circuit 100 via the power supply terminal VDD, and the other branch passes through the power supply terminal VDD and the second resistor R2. When the first test pad a and the second test pad B are short-circuited, the branch formed by the power supply terminal VDD and the second resistor R2 is turned on, and the resistance of the second resistor R2 is the same as that of the first resistor R1, so that the battery voltage is divided by the second resistor R2 and the first resistor R1, and the voltage signal received at the power supply terminal VDD is reduced, when the voltage of the power supply terminal VDD is smaller than the overdischarge protection voltage and the time exceeds the overdischarge delay time, the battery protection circuit 100 performs the sleep mode, and in the sleep mode, the first switch unit 180 is turned off to stop the battery 300 from supplying power to the system circuit 200, and at least part of the cells of the battery protection circuit 100 are stopped supplying power. In the present embodiment, the voltage of the battery is reduced to half, and half of the battery voltage is generally lower than the preset threshold voltage of the deep discharge setting, and generally speaking, the power supply voltage of the battery 300 is in the range of 2.8V to 4.2V, the threshold voltage of the deep discharge is generally 2.8V, and half of the battery voltage is in the range of 1.4V to 2.1V and is lower than the threshold voltage of the deep discharge. So that when the first test pad a and the second test pad B are turned on, second, the over-discharge voltage protection unit 190 detects that the voltage of the power supply terminal VDD is lower than the threshold voltage, at which time the over-discharge voltage protection unit 190 controls the first switching unit 180 to be turned off and controls other units of the circuit protection system 100 except for the charge detection unit to be stopped from being supplied with power.

3. On the basis of the mode 1, in another embodiment of the present application, the original circuits and functions of the over-discharge voltage protection unit 190 in the prior art are fully utilized, so as to actively control the first switch unit 180 to be turned off, and actively control the battery protection circuit 100 except for the charge detection unit to be stopped supplying power, so that the power retention time of the battery 300 is increased, and meanwhile, the cost can be reduced, please refer to fig. 4. A first test pad A and a second test pad B are added to the battery protection circuit. The first test welding spot A is directly and electrically connected with the power supply end of the power supply, the second test welding spot B is electrically grounded, and the first test welding spot A and the second test welding spot B are used for being electrically connected with the test unit. In this embodiment, the test unit is a wire and a second resistor, and the second resistor is disposed between the first test bonding point a and the second test point B. When the first test welding point A and the second test welding point B are electrically connected through the second resistor, the first test welding point A, the second test welding point B and the second resistor are conducted, so that a voltage signal received by a power supply end of a power supply is lower than a preset threshold voltage, the battery protection circuit enters a sleep mode, and in the sleep mode, the first switch unit is switched off, so that the battery stops supplying power to a system circuit, and at least part of circuits of the battery protection circuit are stopped supplying power. Specifically, in fig. 1, the output of the electric quantity of the battery 300 is divided into two branches from the power supply terminal VDD, one branch enters the battery protection circuit 100 via the power supply terminal VDD, and the other branch passes through the power supply terminal VDD and the second resistor R2. When the first test pad a and the second test pad B are short-circuited, the branch formed by the power supply terminal VDD and the second resistor R2 is turned on, and the resistance of the second resistor R2 is the same as that of the first resistor R1, so that the battery voltage is divided by the second resistor R2 and the first resistor R1, and the voltage signal received at the power supply terminal VDD is reduced, when the voltage of the power supply terminal VDD is smaller than the overdischarge protection voltage and the time exceeds the overdischarge delay time, the battery protection circuit 100 performs the sleep mode, and in the sleep mode, the first switch unit 180 is turned off to stop the battery 300 from supplying power to the system circuit 200, and at least part of the cells of the battery protection circuit 100 are stopped supplying power. In the present embodiment, the voltage of the battery is reduced to half, and half of the battery voltage is generally lower than the preset threshold voltage of the deep discharge setting, and generally speaking, the power supply voltage of the battery 300 is in the range of 2.8V to 4.2V, the threshold voltage of the deep discharge is generally 2.8V, and half of the battery voltage is in the range of 1.4V to 2.1V and is lower than the threshold voltage of the deep discharge. So that when the first test pad a and the second test pad B are turned on, second, the over-discharge voltage protection unit 190 detects that the voltage of the power supply terminal VDD is lower than the threshold voltage, at which time the over-discharge voltage protection unit 190 controls the first switching unit 180 to be turned off and controls other units of the circuit protection system 100 except for the charge detection unit to be stopped from being supplied with power.

In the present embodiment, referring to fig. 1 and fig. 2, the circuit protection system 100 further includes a system ground VM, the system ground VM is used for electrically connecting to the system circuit 200, and the system ground VM is also used for charging. In the present embodiment, the first switching unit 180 is disposed between the system ground VM and the power ground GND.

In this embodiment, the battery protection circuit 100 is fabricated on the same chip, that is, the battery protection circuit 100 is integrally fabricated as a System On Chip (SOC), which is a technology commonly used in the field of integrated circuits, and aims to combine a plurality of integrated circuits with specific functions on one chip to form a System or product, including a finished hardware System and embedded software carried by the System or product. The system on chip has obvious advantages in aspects of performance, cost, power consumption, reliability, life cycle, application range and the like. In addition, in other embodiments of the present application, the units of the battery protection circuit 100 except for the first switch unit 180 are all fabricated on the same chip, that is, the units of the battery protection circuit 100 except for the first switch unit 180 are integrally fabricated as a system on chip. In addition, in other embodiments of the present application, the second resistor R2 and the capacitor C in fig. 2 may also be implemented in a system on chip.

In another embodiment of the present application, there is provided a test subsystem comprising:

the battery protection circuit as described above;

In an embodiment of the present application, the test unit is a conductive line, and a second resistor is disposed between the first test pad and the power supply terminal.

In an embodiment of the present application, the test unit is a conductive line, and a second resistor is disposed between the second test pad and the ground.

In an embodiment of the present application, the test unit is a wire and a second resistor, and the second resistor is disposed between the first test pad and the second test point.

In another embodiment of the present application, there is provided a test system including:

a battery pack having a plurality of batteries,

the test subsystem as described above, wherein the power supply terminal and the power ground terminal of the battery protection circuit in the test subsystem are electrically connected to the battery respectively.

The battery may have a capacity of 10mAH to 80mAH, for example, 10mAH, 20mAH, 30mAH, 40mAH, 50mAH, 60mAH, 70mAH, 80 mAH.

It should be understood that reference to "a plurality" herein means two or more. Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the device embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present application and is not to be construed as limiting the scope of the present application, so that the present application is not limited thereto, and all equivalent variations and modifications can be made to the present application.

Claims

1. A battery protection circuit, comprising: the power supply protection circuit comprises a power supply end, a power grounding end, an over-discharge voltage protection unit, a control unit, a first resistor, a first switch unit, a first test welding spot and a second test welding spot, wherein the power supply end and the power grounding end are respectively used for being electrically connected with a battery;

2. The battery protection circuit of claim 1, further comprising a wake-up unit powered while in a sleep mode, the wake-up unit to cause the battery protection circuit to exit the sleep mode.

3. The battery protection circuit of claim 1, wherein the first test pad is in direct electrical connection with a power supply terminal; or a second resistor is arranged between the first test welding spot and the power supply end of the power supply to be indirectly electrically connected.

4. The battery protection circuit of claim 1, wherein the second test pad is directly grounded; or a second resistor is arranged between the second test welding spot and the ground for indirect electric connection.

5. The battery protection circuit of claim 1, wherein the over-discharge voltage protection unit is electrically connected to the power supply terminal, and when the voltage signal of the power supply terminal is lower than a threshold voltage, the discharge protection unit controls the battery protection circuit to enter a sleep mode, in which the first switch unit is turned off, and at least a part of the battery protection circuit is powered off.

6. The battery protection circuit of claim 2, wherein the wake-up unit is a charge detection unit. When the charging detection unit detects a charging signal, the battery protection circuit exits the sleep mode.

7. The battery protection circuit according to claim 1, further comprising an overcharge voltage protection unit, a discharge overcurrent protection unit, a reference voltage generation unit, and a frequency generation unit, wherein at least one of the overcharge voltage protection unit, the overdischarge voltage protection unit, the discharge overcurrent protection unit, the control unit, the reference voltage generation unit, and the frequency generation unit is stopped from being supplied with power in the sleep mode.

8. The battery protection circuit of claim 2, wherein circuits of the battery protection circuit other than the wake-up unit are powered down when the battery protection circuit enters the sleep mode.

9. The battery protection circuit of claim 1 or 2, wherein the first switching unit comprises a MOS transistor.

10. The battery protection circuit according to claim 1 or 2, wherein the battery protection circuit is fabricated on the same chip, or the battery protection circuit is fabricated on the same chip except for the first switching unit.

11. A battery assembly, comprising:

a battery;

the battery protection circuit according to any one of claims 1 to 10, wherein a power supply terminal and a power supply ground terminal of the battery protection circuit are electrically connected to the battery, respectively.

12. The battery assembly of claim 11, wherein the battery has a capacity of 10mAH to 80 mAH.

13. A test subsystem, comprising:

the battery protection circuit of any of claims 1-10;

14. The test subsystem of claim 13, wherein the test element is a wire and a second resistor is disposed between the first test pad and the power supply terminal.

15. The test subsystem of claim 13, wherein the test element is a wire and a second resistor is disposed between the second test pad and ground.

16. The test subsystem of claim 13, wherein the test elements are wires and a second resistor, the second resistor being disposed between the first test pad and the second test point.

17. A test system, comprising:

a battery pack having a plurality of batteries,

the test subsystem of any one of claims 13-16, wherein a power supply terminal and a power supply ground terminal of the battery protection circuit in the test subsystem are electrically connected to the battery, respectively.

18. The test system of claim 17, wherein the battery has a capacity of 10mAH to 80 mAH.

19. An electronic device, comprising:

the battery module according to claim 11 or 12;