Battery protection chip and battery system

Abstract

The utility model provides a battery protection chip and a battery system, and the battery protection chip comprises an alarm sending interface, the first end of which is used for being electrically connected with an alarm; the logic circuit is used for outputting high and low level signals; the alarm circuit comprises a voltage dividing structure and a three-terminal switch structure, the first end of the voltage dividing structure is used for being electrically connected with a first power supply, the second end of the voltage dividing structure is grounded, the first end of the switch structure is electrically connected with the first end of the voltage dividing structure, and the second end of the switch structure is electrically connected with the second end of the alarm sending interface; the control end of the switch structure is electrically connected with the first output end of the logic circuit. The problem that in the prior art, when the battery is abnormal, the battery load is directly interrupted, and the use experience of a product is poor is solved.

Description

Technical Field

[0001] The present application relates to the field of power supply technology, and in particular to a battery protection chip and a battery system. Background Art

[0002] At present, the host side of the mobile phone lithium battery protection can only passively receive the battery protection action, and cannot accurately understand the battery protection status and action time.

[0003] When used abnormally, the battery protection board will directly shut down the battery output, and the battery load will passively accept it, which will directly interrupt the work, greatly affecting the product experience. Utility Model Content

[0004] The main purpose of the present application is to provide a battery protection chip and a battery system to solve the problem in the prior art that when the battery is abnormal, the battery load is directly interrupted from working, resulting in a poor product usage experience.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a battery protection chip is provided, including: an alarm sending interface, a first end of the alarm sending interface is used to be electrically connected to an alarm; a logic circuit is used to output high and low level signals; an alarm circuit, the alarm circuit includes a voltage divider structure and a three-terminal switch structure, the first end of the voltage divider structure is used to be electrically connected to a first power supply, the second end of the voltage divider structure is grounded, the first end of the switch structure is electrically connected to the first end of the voltage divider structure, the second end of the switch structure is electrically connected to the second end of the alarm sending interface, and the control end of the switch structure is electrically connected to the first output end of the logic circuit.

[0006] Optionally, the voltage-dividing structure includes: a plurality of first resistors connected in series, wherein the end of the first resistor close to the first power supply is the first end of the first resistor; the switching structure includes: a plurality of first switching devices, wherein the first ends of the first switching devices are electrically connected one-to-one to the first end of the first resistor, and the second ends of the plurality of first switching devices are electrically connected to the second end of the alarm sending interface; the first output end includes a plurality of sub-output ends, wherein the sub-output ends are electrically connected one-to-one to the control ends of the first switching devices, and the logic circuit outputs a first level signal through one of the sub-output ends, wherein the first level signal is used to control the corresponding first switching device to be turned on, and outputs a second level signal through the remaining sub-output ends, wherein the second level signal is used to control the corresponding first switching device to be turned off.

[0007] Optionally, at least some of the first resistors have different resistance values.

[0008] Optionally, the alarm circuit further includes: a first diode, an anode of the first diode is grounded, and a cathode of the first diode is used to be electrically connected to the first power supply.

[0009] Optionally, the battery protection chip further includes: a comparison circuit, including an over-discharge comparator, an over-charge comparator, a discharge over-current comparator, a load short-circuit comparator and a charge over-current comparator, wherein the first input end of the over-discharge comparator is used to receive a first voltage signal, the first voltage signal is two-thirds of the voltage of the battery cell, the second input end of the over-discharge comparator is used to receive a first reference voltage signal, the output end of the over-discharge comparator is electrically connected to the first input end of the logic circuit, the first input end of the over-charge comparator is used to receive a second voltage signal, the second voltage signal is one-third of the voltage of the battery cell, the second input end of the over-charge comparator is used to receive the first reference voltage signal, the output end of the over-charge comparator is electrically connected to the second input end of the logic circuit, and the discharge The first input terminal of the overcurrent comparator is used to receive a third voltage signal, which is the voltage across the load. The second input terminal of the discharge overcurrent comparator is used to receive a second reference voltage signal, and the output terminal of the discharge overcurrent comparator is electrically connected to the third input terminal of the logic circuit. The first input terminal of the load short-circuit comparator is used to receive the third voltage signal, and the second input terminal of the load short-circuit comparator is used to receive the third reference voltage signal, and the output terminal of the load short-circuit comparator is electrically connected to the fourth input terminal of the logic circuit. The first input terminal of the charging overcurrent comparator is used to receive the third voltage signal, and the second input terminal of the charging overcurrent comparator is used to receive the fourth reference voltage signal, and the output terminal of the charging overcurrent comparator is electrically connected to the fifth input terminal of the logic circuit.

[0010] Optionally, the third reference voltage signal is smaller than the second reference voltage signal, and the second reference voltage signal is smaller than the fourth reference voltage signal.

[0011] According to another aspect of the present application, a battery system is provided, comprising: any one of the battery protection chips described above; an alarm; and a first power source.

[0012] Optionally, the battery protection chip also includes an alarm sending interface, a power interface, a ground interface, a discharge protection execution interface, a charging protection execution interface, an overcurrent short circuit detection interface and a voltage detection interface, and the battery system also includes: a battery cell, including a positive electrode and a negative electrode; a second resistor, a first end of the second resistor is electrically connected to the positive electrode of the battery cell, and a second end of the second resistor is electrically connected to the power interface; a first capacitor, a first end of the first capacitor is electrically connected to the second end of the second resistor, and a second end of the first capacitor is electrically connected to the ground interface; a second switch device, a first end of the second switch device is electrically connected to the voltage detection interface, a first end of the second switch device is electrically connected to the negative electrode of the battery cell, and a control end of the second switch device is electrically connected to the discharge protection execution interface; a third switch device, a first end of the third switch device is electrically connected to the second end of the second switch device, a control end of the third switch device is electrically connected to the charging protection execution interface, and a second end of the third switch device is electrically connected to the overcurrent short circuit detection interface; a first interface, the alarm sending interface is electrically connected to the alarm through the first interface.

[0013] Optionally, the battery system also includes: a second capacitor, a first end of the second capacitor is electrically connected to the first end of the second switching device, and a second end of the second capacitor is electrically connected to the second end of the third switching device; a third capacitor, a first end of the third capacitor is electrically connected to the positive electrode of the battery cell, and a second end of the third capacitor is grounded; a third resistor, a first end of the second switching device is electrically connected to the negative electrode of the battery cell through the third resistor; and a fourth resistor, a second end of the third switching device is electrically connected to the overcurrent short circuit detection interface through the fourth resistor.

[0014] Optionally, the battery system further includes: a second interface; a third interface; a fourth interface; a thermistor, wherein a first end of the thermistor is electrically connected to an input end of the second interface, and a second end of the thermistor is grounded; a fifth resistor, wherein a first end of the fifth resistor is electrically connected to an input end of the third interface, and a second end of the fifth resistor is grounded; and a transient suppression diode, wherein a first end of the transient suppression diode is electrically connected to an input end of the fourth interface, and a second end of the transient suppression diode is grounded.

[0015] Applying the technical solution of the present application, the battery protection chip includes an alarm sending interface, a logic circuit and an alarm circuit, the first end of the alarm sending interface is used to be electrically connected to the alarm, the logic circuit is used to output high and low level signals, the alarm circuit includes a voltage divider structure and a three-terminal switch structure, the first end of the voltage divider structure is used to be electrically connected to the first power supply, the second end of the voltage divider structure is grounded, the first end of the switch structure is electrically connected to the first end of the voltage divider structure, the second end of the switch structure is electrically connected to the second end of the alarm sending interface, and the control end of the switch structure is electrically connected to the first output end of the logic circuit. Compared with the problem that the battery load is interrupted when the battery is abnormal in the prior art, resulting in a poor battery load use experience, the battery protection chip of the present application adds an alarm sending interface and an alarm circuit, and in the case of abnormal battery use, the logic circuit will output high and low level signals, so that the switch structure in the alarm circuit is turned on, the alarm is connected to the first power supply, and the alarm sends an alarm signal to remind the user of the battery load, so as to avoid the battery load being directly interrupted when the user is unaware, thereby improving the product use experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0017] Figure 1 A schematic diagram of the structure of a battery protection chip provided according to an embodiment of the present application is shown;

[0018] Figure 2 A schematic diagram of the structure of a specific battery protection chip provided according to an embodiment of the present application is shown;

[0019] Figure 3 A schematic structural diagram of a battery system provided according to an embodiment of the present application is shown.

[0020] The above drawings include the following reference numerals:

[0021] 10. Battery protection chip; 11. Alarm sending interface; 12. Alarm; 20. Logic circuit; 30. Alarm circuit; 31. Voltage division structure; 32. Switch structure; 33. First power supply; 311. First resistor; 321. First switch device; 34. First diode; 60. Comparison circuit; 61. Over-discharge comparator; 62. Over-charge comparator; 63. Discharge over-current comparator; 64. Load short-circuit comparator; 65. Charge over-current comparator; 40. Discharge switch structure; 50. Charge switch structure; 41. Fourth switch device; 42. Fifth switch device; 43. Second diode; 44. Second power supply; 51. Sixth switch device; 52. Seventh switch device; 53. Third diode; 54. Third power supply; 55. Fourth power supply; 66, fifth power supply; 67, sixth power supply; 68, seventh power supply; 69, eighth power supply; 70, ninth power supply; 71, tenth power supply; 72, eleventh power supply; 73, twelfth power supply; 74, fourth diode; 75, fifth diode; 76, sixth diode; 77, sixth resistor; 78, seventh resistor; 79, eighth resistor; 80, ninth resistor; 81, tenth resistor; 82, first switch; 83, second switch; 13, battery cell; 14, second resistor; 15, first capacitor; 16, second switch device; 17, third switch device; 19, second capacitor; 90, third capacitor; 91, third resistor; 92, fourth resistor; 93, thermistor; 94, fifth resistor; 95, transient suppression diode. DETAILED DESCRIPTION

[0022] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0023] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0024] It should be understood that when an element (such as a layer, film, region, or substrate) is described as being "on" another element, the element may be directly on the other element, or there may be intermediate elements. Moreover, in the specification and claims, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element, or "connected" to the other element through a third element.

[0025] As introduced in the background technology, in the prior art, when the battery is abnormal, the battery load is directly interrupted from working, resulting in a poor product usage experience. In order to solve the above technical problems, the present application proposes a battery protection chip and a battery system.

[0026] In a typical implementation of the present application, Figure 1 As shown, a battery protection chip 10 is provided, comprising:

[0027] An alarm sending interface 11, a first end of the alarm sending interface 11 is used to be electrically connected to an alarm 12;

[0028] Logic circuit 20, used for outputting high and low level signals;

[0029] The alarm circuit 30 includes a voltage divider structure 31 and a three-terminal switch structure 32, wherein the first end of the voltage divider structure 31 is used to be electrically connected to a first power supply 33, the second end of the voltage divider structure 31 is grounded, the first end of the switch structure 32 is electrically connected to the first end of the voltage divider structure 31, the second end of the switch structure 32 is electrically connected to the second end of the alarm sending interface 11, and the control end of the switch structure 32 is electrically connected to the first output end of the logic circuit 20.

[0030] Through the above embodiments, the battery protection chip of the present application includes an alarm sending interface, a logic circuit and an alarm circuit, the first end of the alarm sending interface is used to be electrically connected to the alarm, the logic circuit is used to output high and low level signals, the alarm circuit includes a voltage divider structure and a three-terminal switch structure, the first end of the voltage divider structure is used to be electrically connected to the first power supply, the second end of the voltage divider structure is grounded, the first end of the switch structure is electrically connected to the first end of the voltage divider structure, the second end of the switch structure is electrically connected to the second end of the alarm sending interface, and the control end of the switch structure is electrically connected to the first output end of the logic circuit. Compared with the problem that the battery load is interrupted when the battery is abnormal in the prior art, resulting in a poor battery load usage experience, the battery protection chip of the present application adds an alarm sending interface and an alarm circuit. In the case of abnormal battery use, the logic circuit will output high and low level signals, so that the switch structure in the alarm circuit is turned on, the alarm is connected to the first power supply, and the alarm sends an alarm signal to remind the user of the battery load, so as to avoid the battery load being directly interrupted when the user is unaware, thereby improving the product usage experience.

[0031] Specifically, the battery protection chip also includes a voltage detection circuit, which is used to send a protection signal to the battery protection board when it is detected that the alarm is connected to the first power supply, so that the battery protection board triggers the protection operation of the battery. Specifically, it can be determined whether the two are connected by detecting the voltage signal between the alarm and the first power supply; of course, the battery protection chip can also include a delay device, which is used to enable the battery protection board to perform the protection operation on the battery after the first predetermined time when the battery protection board receives the protection signal. The first predetermined time can be set to 0.1S, and can also be adjusted according to actual needs.

[0032] In one embodiment of the present application, Figure 2 As shown, the voltage-dividing structure includes: a plurality of first resistors 311 connected in series, and the end of the first resistor 311 close to the first power supply 33 is the first end of the first resistor 311; the switch structure includes: a plurality of first switch devices 321, and the first ends of the first switch devices 321 are electrically connected to the first ends of the first resistors 311 one by one, and the second ends of the plurality of first switch devices 321 are electrically connected to the second end of the alarm sending interface 11; the first output end includes a plurality of sub-output ends, and the sub-output ends are electrically connected to the control ends of the first switch devices one by one, and the logic circuit outputs a first level signal through one of the sub-output ends, and the first level signal is used to control the corresponding first switch device to be turned on, and outputs a second level signal through the remaining sub-output ends, and the second level signal is used to control the corresponding first switch device to be turned off (not shown in the figure). In the present embodiment, a plurality of first resistors connected in series and a plurality of first switching devices connected to the first ends of the plurality of first resistors in a one-to-one correspondence are provided, and the logic circuit includes a plurality of sub-output ends, wherein one sub-output end outputs a first level signal to control the first switching device connected thereto to be turned on, and the remaining sub-output ends output a second level signal to control the remaining first switching devices connected thereto to be turned off, so that the alarm sending interface can receive voltage signals of different sizes according to the conduction of different first switching devices, and voltage signals of different sizes can represent different protection types of the battery, so that the alarm can send different alarm signals according to voltage signals of different sizes to determine the protection type of the battery, so that the battery load can obtain more detailed battery abnormality conditions, further improving the product usage experience.

[0033] Specifically, the protection types of the battery include but are not limited to short circuit protection, overcurrent protection and overvoltage protection, wherein the overcurrent protection includes charging overcurrent protection and discharging overcurrent protection, and the overvoltage protection includes charging overvoltage protection and discharging overvoltage protection.

[0034] In actual application, the above-mentioned first switching device can be a MOS (Metal-Oxide-Semiconductor) tube, a triode, or other types of transistors. Technical personnel in this field can flexibly select a suitable first switching device according to actual needs, and this application does not impose specific restrictions on this.

[0035] In more specific embodiments, Figure 2 As shown, the first switch device 321 is a MOS tube. When the first switch device is an NMOS tube, the first level signal is a high level signal to control the first switch device to be turned on, and the second level signal is a low level signal to control the remaining first switch devices to be turned off. When the first switch device is a PMOS tube, the first level signal is a low level signal to control the first switch device to be turned on, and the second level signal is a high level signal to control the remaining first switch devices to be turned off.

[0036] Of course, the battery protection chip may also include a counter and an oscillator. Under the joint action of the counter, the oscillator, the delay device, the voltage detection circuit and the logic circuit, the level signal outputted by one of the sub-output terminals of the logic circuit is continuously flipped, that is, the high level lasts for the second predetermined time, and the low level lasts for the third predetermined time. The high and low levels are continuously alternating in this way, so that the alarm continues to alarm, and the second predetermined time can be set to 1 / N of the first predetermined time, so that the user can determine the first predetermined time according to the second predetermined time, so that the user can perform a protective operation on the battery load before the total alarm time of the alarm reaches the first predetermined time, further improving the product use experience. The total alarm time is the sum of the duration of the high level and the low level. In addition, those skilled in the art can set different first predetermined time, second predetermined time and third predetermined time according to different protection types of the battery, so that the user can also distinguish the protection type of the battery according to the duration of the high and low levels of the alarm. The second predetermined time length may be set to 0.01S, the third predetermined time length may be set to 0.001S, and the specific time lengths of the second predetermined time length and the third predetermined time length may also be adjusted according to actual needs.

[0037] In the embodiment of the present application, Figure 2The example shows that there are three first resistors 311 and three first switch devices 321, and the resistance values ​​of the three first resistors 311 are the same. Under this circuit structure, it can be set that when the voltage signal received by the alarm sending interface is the voltage of the first power supply, it indicates that the protection type of the battery is short circuit protection, when the voltage signal received by the alarm sending interface is two-thirds of the voltage of the first power supply, it indicates that the protection type of the battery is overcurrent protection, and when the voltage signal received by the alarm sending interface is one-third of the voltage of the first power supply, it indicates that the protection type of the battery is overvoltage protection. Of course, the resistance values ​​of at least some of the first resistors can also be different.

[0038] Of course, the number of the first resistor and the first switch device is not limited to 3, but may be 2, 4, or other numbers. In actual application, those skilled in the art may flexibly select the appropriate number of the first resistor and the first switch device according to actual needs, and this application does not impose any specific restrictions on this.

[0039] Some optional solutions of this application, such as Figure 2 As shown, the alarm circuit 30 further includes: a first diode 34, the anode of the first diode 34 is grounded, and the cathode of the first diode 34 is electrically connected to the first power source 33. In this embodiment, by providing the first diode, the entire alarm circuit is protected, thereby ensuring the safety and stability of the alarm circuit.

[0040] In other embodiments, Figure 2As shown, the battery protection chip 10 further includes: a comparison circuit 60, the comparison circuit 60 includes an over-discharge comparator 61, an over-charge comparator 62, a discharge over-current comparator 63, a load short-circuit comparator 64 and a charge over-current comparator 65, the first input end of the over-discharge comparator 61 is used to receive a first voltage signal, the first voltage signal is two-thirds of the voltage of the battery cell, the second input end of the over-discharge comparator 61 is used to receive a first reference voltage signal, the output end of the over-discharge comparator 61 is electrically connected to the first input end of the logic circuit 20, the first input end of the over-charge comparator 62 is used to receive a second voltage signal, the second voltage signal is one-third of the voltage of the battery cell, the second input end of the over-charge comparator 62 is used to receive the first reference voltage signal, the output end of the over-charge comparator 62 is electrically connected to the second input end of the logic circuit 20 The first input terminal of the discharge overcurrent comparator 63 is used to receive a third voltage signal, which is the voltage across the load. The second input terminal of the discharge overcurrent comparator 63 is used to receive a second reference voltage signal. The output terminal of the discharge overcurrent comparator 63 is electrically connected to the third input terminal of the logic circuit 20. The first input terminal of the load short-circuit comparator 64 is used to receive the third voltage signal. The second input terminal of the load short-circuit comparator 64 is used to receive the third reference voltage signal. The output terminal of the load short-circuit comparator 64 is electrically connected to the fourth input terminal of the logic circuit 20. The first input terminal of the charge overcurrent comparator 65 is used to receive the third voltage signal. The second input terminal of the charge overcurrent comparator 65 is used to receive the fourth reference voltage signal. The output terminal of the charge overcurrent comparator 65 is electrically connected to the fifth input terminal of the logic circuit 20. In this embodiment, by setting a comparison circuit, the comparison circuit includes an over-discharge comparator, an over-charge comparator, a discharge overcurrent comparator, a load short-circuit comparator and a charge overcurrent comparator. Different level signals are output to the logic circuit through the output end of each comparator, so as to prepare for the logic circuit to control the conduction of different first switching devices according to these different level signals, and further enable the battery load to receive detailed battery abnormal conditions through the alarm, thereby further improving the product usage experience.

[0041] Specifically, the output end of the over-discharge comparator is used to output a third level signal to the logic circuit to control one of the first switch devices to be turned on and the remaining first switch devices to be turned off when the first voltage signal is less than the first reference voltage signal; the output end of the over-charge comparator is used to output a fourth level signal to the logic circuit to control one of the first switch devices to be turned on and the remaining first switch devices to be turned off when the second voltage signal is greater than the first reference voltage signal; the output end of the discharge overcurrent comparator is used to output a fifth level signal to the logic circuit to control one of the first switch devices to be turned on and the remaining first switch devices to be turned off when the third voltage signal is less than the second reference voltage signal; the output end of the load short-circuit comparator is used to output a sixth level signal to the logic circuit to control one of the first switch devices to be turned on and the remaining first switch devices to be turned off when the third voltage signal is less than the third reference voltage; the output end of the charge overcurrent comparator is used to output a seventh level signal to the logic circuit to control one of the first switch devices to be turned on and the remaining first switch devices to be turned off when the third voltage signal is greater than the fourth reference voltage signal.

[0042] In some more specific embodiments, the third reference voltage signal is smaller than the second reference voltage signal, and the second reference voltage signal is smaller than the fourth reference voltage signal. In this embodiment, by setting the third reference voltage signal to be smaller than the second reference voltage signal, and the second reference voltage signal to be smaller than the fourth reference voltage signal, the third voltage signal can be compared with the second reference voltage signal, the third reference voltage signal, and the fourth reference voltage signal, respectively, and the comparison functions of discharge overcurrent, load short circuit, and charge overcurrent can be realized respectively.

[0043] In other embodiments, Figure 2 As shown, the battery protection chip 10 further includes a three-terminal discharge switch structure 40 and a charge switch structure 50, wherein the control end of the discharge switch structure 40 is electrically connected to the second output end of the logic circuit 20, and the control end of the charge switch structure 50 is electrically connected to the third output end of the logic circuit 20.

[0044] Specifically, when the above-mentioned first voltage signal is less than the above-mentioned first reference voltage signal, the output end of the above-mentioned over-discharge comparator outputs a third level signal to the above-mentioned logic circuit to control the above-mentioned discharge switch structure to be turned on; when the above-mentioned second voltage signal is greater than the above-mentioned first reference voltage signal, the output end of the above-mentioned over-charge comparator outputs a fourth level signal to the above-mentioned logic circuit to control the above-mentioned charge switch structure to be turned on.

[0045] In more specific embodiments, Figure 2 As shown, the battery protection chip 10 further includes a discharge protection execution interface DO, a charge protection execution interface CO and an overcurrent short circuit detection interface VM; the discharge switch structure 40 includes a fourth switch device 41, a fifth switch device 42, a second diode 43 and a second power supply 44, the first end of the fourth switch device 41 is used to be electrically connected to the second power supply 44, the second end of the fourth switch device 41 is electrically connected to the discharge protection execution interface DO, the control end of the fourth switch device 41 is electrically connected to the second output end, the control end of the fifth switch device 42 is electrically connected to the second output end, the first end of the fifth switch device 42 is grounded, the second end of the fifth switch device 42 is electrically connected to the discharge protection execution interface DO, the anode of the second diode 43 is grounded, and the cathode of the second diode 43 is connected to the discharge protection execution interface DO. The charging switch structure 50 includes a sixth switch device 51, a seventh switch device 52, a third diode 53, a third power supply 54 and a fourth power supply 55. The first end of the sixth switch device 51 is used to be electrically connected to the third power supply 54, the second end of the sixth switch device 51 is electrically connected to the charging protection execution interface CO, the control end of the sixth switch device 51 is electrically connected to the third output end, the control end of the seventh switch device 52 is electrically connected to the third output end, the first end of the seventh switch device 52 is electrically connected to the over-current short-circuit detection interface VM, the second end of the seventh switch device 52 is electrically connected to the charging protection execution interface CO, the anode of the third diode 53 is electrically connected to the charging protection execution interface CO, and the cathode of the third diode 53 is used to be electrically connected to the fourth power supply 55.

[0046] In more specific embodiments, Figure 2As shown, the battery protection chip 10 further includes a power interface VDD, a ground interface VSS and a voltage detection interface VINI;The comparison circuit 60 further includes: a fifth power supply 66, a sixth power supply 67, a seventh power supply 68, an eighth power supply 69, a ninth power supply 70, a tenth power supply 71, an eleventh power supply 72, a twelfth power supply 73, a fourth diode 74, a fifth diode 75, a sixth diode 76, a sixth resistor 77, a seventh resistor 78, an eighth resistor 79, a ninth resistor 80, a tenth resistor 81, and a first switch 82 and a second switch 83 at two terminals. The power supply interface VDD is electrically connected to the fifth power supply 66, the positive electrode of the fourth diode 74 is grounded, the negative electrode of the fourth diode 74 is electrically connected to the fifth power supply 66, the first end of the sixth resistor 77 is electrically connected to the negative electrode of the fourth diode 74, and the The second end of the sixth resistor 77 is electrically connected to the first input end of the over-discharge comparator 61, the second input end of the over-discharge comparator 61 is electrically connected to the positive electrode of the sixth power supply 67, the first end of the seventh resistor 78 is electrically connected to the second end of the sixth resistor 77, the second end of the seventh resistor 78 is electrically connected to the first input end of the over-charge comparator 62, the second input end of the over-charge comparator 62 is electrically connected to the positive electrode of the sixth power supply 67, the negative electrode of the sixth power supply 67 is grounded, the first end of the eighth resistor 79 is electrically connected to the second end of the seventh resistor 78, the second end of the eighth resistor 79 is grounded, and the positive electrode of the fifth diode 75 is electrically connected to the voltage detection interface VINI. The cathode of the fifth diode 75 is electrically connected to the seventh power supply 68, the first input terminal of the discharge overcurrent comparator 63 is electrically connected to the voltage detection interface VINI, the second input terminal of the discharge overcurrent comparator 63 is electrically connected to the positive electrode of the eighth power supply 69, the negative electrode of the eighth power supply 69 is grounded, the first input terminal of the load short-circuit comparator 64 is electrically connected to the voltage detection interface VINI, the second input terminal of the load short-circuit comparator 64 is electrically connected to the positive electrode of the ninth power supply 70, the negative electrode of the ninth power supply 70 is grounded, the first input terminal of the charge overcurrent comparator 65 is electrically connected to the voltage detection interface VINI, the second input terminal of the charge overcurrent comparator 65 is electrically connected to the voltage detection interface VINI, The positive electrode of the tenth power supply 71 is electrically connected, the negative electrode of the tenth power supply 71 is grounded, the positive electrode of the sixth diode 76 is electrically connected to the overcurrent short circuit detection interface VM, the negative electrode of the sixth diode 76 is electrically connected to the eleventh power supply 72, the first end of the ninth resistor 80 is electrically connected to the overcurrent short circuit detection interface VM, the second end of the ninth resistor 80 is electrically connected to the first end of the first switch 82, the second end of the first switch 82 is electrically connected to the twelfth power supply 73, the first end of the tenth resistor 81 is electrically connected to the overcurrent short circuit detection interface VM, the second end of the tenth resistor 81 is electrically connected to the first end of the second switch 83, and the second end of the second switch 83 is grounded.;

[0047] According to another aspect of the present application, a battery system is provided, such as Figure 3 As shown, it includes: any one of the above-mentioned battery protection chips 10; an alarm 12; and a first power source (not shown in the figure).

[0048] The battery system includes any of the above-mentioned battery protection chips, the battery protection chip includes an alarm sending interface, a logic circuit and an alarm circuit, the first end of the alarm sending interface is used to be electrically connected to the alarm, the logic circuit is used to output high and low level signals, the alarm circuit includes a voltage divider structure and a three-terminal switch structure, the first end of the voltage divider structure is used to be electrically connected to the first power supply, the second end of the voltage divider structure is grounded, the first end of the switch structure is electrically connected to the first end of the voltage divider structure, the second end of the switch structure is electrically connected to the second end of the alarm sending interface, and the control end of the switch structure is electrically connected to the first output end of the logic circuit. Compared with the problem that the battery load is interrupted when the battery is abnormal in the prior art, resulting in a poor battery load usage experience, the battery protection chip of the present application adds an alarm sending interface and an alarm circuit, and in the case of abnormal battery use, the logic circuit will output high and low level signals, so that the switch structure in the alarm circuit is turned on, the alarm is connected to the first power supply, and the alarm sends an alarm signal to remind the user of the battery load, so as to avoid the battery load being directly interrupted when the user is unaware, thereby improving the product usage experience.

[0049] According to some exemplary embodiments of the present application, Figure 3As shown, the battery protection chip 10 further includes an alarm sending interface 11, a power interface VDD, a ground interface VSS, a discharge protection execution interface DO, a charge protection execution interface CO, an overcurrent short circuit detection interface VM and a voltage detection interface VINI, and the battery system further includes: a battery cell 13, including a positive electrode and a negative electrode; a second resistor 14, a first end of the second resistor 14 is electrically connected to the positive electrode of the battery cell 13, and a second end of the second resistor 14 is electrically connected to the power interface VDD; a first capacitor 15, a first end of the first capacitor 15 is electrically connected to the second end of the second resistor 14, and a second end of the first capacitor 15 is electrically connected to the ground interface VSS; a second switch Device 16, the first end of the above-mentioned second switch device 16 is electrically connected to the above-mentioned voltage detection interface VINI, the first end of the above-mentioned second switch device 16 is electrically connected to the negative electrode of the above-mentioned battery cell 13, and the control end of the above-mentioned second switch device 16 is electrically connected to the above-mentioned discharge protection execution interface DO; the third switch device 17, the first end of the above-mentioned third switch device 17 is electrically connected to the second end of the above-mentioned second switch device 16, the control end of the above-mentioned third switch device 17 is electrically connected to the above-mentioned charging protection execution interface CO, and the second end of the above-mentioned third switch device 17 is electrically connected to the above-mentioned over-current short-circuit detection interface VM; the first interface, the above-mentioned alarm sending interface 11 is electrically connected to the above-mentioned alarm 12 through the above-mentioned first interface. In this embodiment, by setting a second resistor to perform voltage division, it can be ensured that the voltage input to the power interface of the battery protection chip is appropriate, thereby ensuring the safety and stability of the battery protection chip. By setting the first capacitor, when an abnormality occurs in the battery and the second switch device and the third switch device are both turned off, the leakage path of "positive electrode of the battery cell → second resistor → negative electrode of the battery cell" is blocked, thereby ensuring the safety of the battery cell. By setting the second switch device, the battery cell can be controlled to be turned off by outputting high and low levels through the discharge protection execution interface of the battery protection chip in the case of overdischarge, so as to block the discharge of the battery cell, thereby further ensuring the safety of the battery cell. By setting the third switch device, the battery cell can be controlled to be turned off by outputting high and low levels through the charging protection execution interface of the battery protection chip in the case of overcharge, thereby blocking the charging of the battery cell, thereby further ensuring the safety of the battery cell.

[0050] In actual application, the second switch device may be a MOS tube, a triode, or other types of transistors. Technicians in the field may flexibly select a suitable second switch device according to actual needs, and the present application does not impose any specific restrictions on this. The third switch device may be a MOS tube, a triode, or other types of transistors. Technicians in the field may flexibly select a suitable third switch device according to actual needs, and the present application does not impose any specific restrictions on this.

[0051] In more specific embodiments, Figure 3 As shown, the second switch device 16 and the third switch device 17 are both MOS tubes.

[0052] According to other embodiments of the present application, Figure 3 As shown, the battery system further includes: a second capacitor 19, the first end of the second capacitor 19 is electrically connected to the first end of the second switch device 16, and the second end of the second capacitor 19 is electrically connected to the second end of the third switch device 17; a third capacitor 90, the first end of the third capacitor 90 is electrically connected to the positive electrode of the battery cell 13, and the second end of the third capacitor 90 is grounded; a third resistor 91, the first end of the second switch device 16 is electrically connected to the negative electrode of the battery cell 13 through the third resistor 91; a fourth resistor 92, the second end of the third switch device 17 is electrically connected to the overcurrent short circuit detection interface VM through the fourth resistor 92. In this embodiment, the second capacitor and the third capacitor can be set to play a filtering role, and the third resistor is set so that the voltage detection interface of the battery protection chip can further protect the battery cell by monitoring the voltage across the third resistor. The fourth resistor can limit the current of the loop between the overcurrent short circuit detection interface of the battery protection chip and the second switch device and the third switch device, thereby ensuring the reliability of the battery.

[0053] According to some other exemplary embodiments of the present application, Figure 3 As shown, the battery system further includes: a second interface; a third interface; a fourth interface; a thermistor 93, wherein the first end of the thermistor 93 is electrically connected to the input end of the second interface, and the second end of the thermistor 93 is grounded; a fifth resistor 94, wherein the first end of the fifth resistor 94 is electrically connected to the input end of the third interface, and the second end of the fifth resistor 94 is grounded; a transient suppression diode 95, wherein the first end of the transient suppression diode 95 is electrically connected to the input end of the fourth interface, and the second end of the transient suppression diode 95 is grounded. In this embodiment, by setting the thermistor, the temperature of the battery cell can be monitored to further ensure the safety of the battery cell, the fifth resistor can be set to play a role in current limiting, and the transient suppression diode can be set to effectively prevent static electricity, thereby protecting the static-sensitive devices in the battery system, and further ensuring the reliability of the battery.

[0054] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0055] 1) The battery protection chip of the present application includes an alarm sending interface, a logic circuit and an alarm circuit. The first end of the alarm sending interface is used to be electrically connected to the alarm. The logic circuit is used to output high and low level signals. The alarm circuit includes a voltage divider structure and a three-terminal switch structure. The first end of the voltage divider structure is used to be electrically connected to the first power supply. The second end of the voltage divider structure is grounded. The first end of the switch structure is electrically connected to the first end of the voltage divider structure. The second end of the switch structure is electrically connected to the second end of the alarm sending interface. The control end of the switch structure is electrically connected to the first output end of the logic circuit. Compared with the problem that the battery load is interrupted when the battery is abnormal in the prior art, resulting in a poor battery load use experience, the battery protection chip of the present application adds an alarm sending interface and an alarm circuit. In the case of abnormal battery use, the logic circuit will output high and low level signals, so that the switch structure in the alarm circuit is turned on, the alarm is connected to the first power supply, and the alarm sends an alarm signal to remind the user of the battery load, so as to avoid the battery load being directly interrupted when the user is unaware, thereby improving the product use experience.

[0056] 2) In the battery system of the present application, any of the above-mentioned battery protection chips is included, and the battery protection chip includes an alarm sending interface, a logic circuit and an alarm circuit. The first end of the alarm sending interface is used to be electrically connected to the alarm, and the logic circuit is used to output high and low level signals. The alarm circuit includes a voltage divider structure and a three-terminal switch structure. The first end of the voltage divider structure is used to be electrically connected to the first power supply, and the second end of the voltage divider structure is grounded. The first end of the switch structure is electrically connected to the first end of the voltage divider structure, and the second end of the switch structure is electrically connected to the second end of the alarm sending interface. The control end of the switch structure is electrically connected to the first output end of the logic circuit. Compared with the problem that the battery load is interrupted when the battery is abnormal in the prior art, resulting in a poor battery load use experience, the battery protection chip of the present application adds an alarm sending interface and an alarm circuit. In the case of abnormal battery use, the logic circuit will output high and low level signals, so that the switch structure in the alarm circuit is turned on, the alarm is connected to the first power supply, and the alarm sends an alarm signal to remind the user of the battery load, so as to avoid the battery load being directly interrupted when the user is unaware, thereby improving the product use experience.

[0057] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery protection chip, characterized in that: include: An alarm sending interface, a first end of which is used to be electrically connected to an alarm; Logic circuit, used to output high and low level signals; An alarm circuit includes a voltage divider structure and a three-terminal switch structure, wherein the first end of the voltage divider structure is used to be electrically connected to a first power supply, the second end of the voltage divider structure is grounded, the first end of the switch structure is electrically connected to the first end of the voltage divider structure, the second end of the switch structure is electrically connected to the second end of the alarm sending interface, and the control end of the switch structure is electrically connected to the first output end of the logic circuit.

2. The battery protection chip according to claim 1, characterized in that: The voltage dividing structure comprises: A plurality of first resistors connected in series, wherein one end of the first resistor close to the first power source is a first end of the first resistor; The switch structure comprises: A plurality of first switch devices, wherein the first ends of the first switch devices are electrically connected to the first ends of the first resistors in a one-to-one correspondence, and the second ends of the plurality of first switch devices are electrically connected to the second end of the alarm sending interface; The first output end includes multiple sub-output ends, and the sub-output ends are electrically connected to the control end of the first switching device one by one. The logic circuit outputs a first level signal through one of the sub-output ends, and the first level signal is used to control the corresponding first switching device to be turned on, and outputs a second level signal through the remaining sub-output ends, and the second level signal is used to control the corresponding first switching device to be turned off.

3. The battery protection chip according to claim 2, characterized in that: At least some of the first resistors have different resistance values.

4. The battery protection chip according to claim 1, characterized in that: The alarm circuit also includes: A first diode, wherein an anode of the first diode is grounded, and a cathode of the first diode is electrically connected to the first power supply.

5. The battery protection chip according to claim 2, characterized in that: The battery protection chip also includes: A comparison circuit, comprising an over-discharge comparator, an over-charge comparator, a discharge over-current comparator, a load short-circuit comparator and a charge over-current comparator, wherein the first input end of the over-discharge comparator is used to receive a first voltage signal, the first voltage signal is two-thirds of the voltage of the battery cell, the second input end of the over-discharge comparator is used to receive a first reference voltage signal, the output end of the over-discharge comparator is electrically connected to the first input end of the logic circuit, the first input end of the over-charge comparator is used to receive a second voltage signal, the second voltage signal is one-third of the voltage of the battery cell, the second input end of the over-charge comparator is used to receive the first reference voltage signal, the output end of the over-charge comparator is electrically connected to the second input end of the logic circuit, the first input end of the discharge over-current comparator is used to receive the first reference voltage signal, the output end of the over-charge comparator is electrically connected to the second input end of the logic circuit, The input end is used to receive a third voltage signal, which is the voltage across the load. The second input end of the discharge overcurrent comparator is used to receive a second reference voltage signal. The output end of the discharge overcurrent comparator is electrically connected to the third input end of the logic circuit. The first input end of the load short-circuit comparator is used to receive the third voltage signal. The second input end of the load short-circuit comparator is used to receive the third reference voltage signal. The output end of the load short-circuit comparator is electrically connected to the fourth input end of the logic circuit. The first input end of the charge overcurrent comparator is used to receive the third voltage signal. The second input end of the charge overcurrent comparator is used to receive the fourth reference voltage signal. The output end of the charge overcurrent comparator is electrically connected to the fifth input end of the logic circuit.

6. The battery protection chip according to claim 5, characterized in that: The third reference voltage signal is smaller than the second reference voltage signal, and the second reference voltage signal is smaller than the fourth reference voltage signal.

7. A battery system, characterized in that: include: The battery protection chip according to any one of claims 1 to 6; Siren; First power source.

8. The battery system according to claim 7, characterized in that: The battery protection chip also includes an alarm sending interface, a power supply interface, a grounding interface, a discharge protection execution interface, a charging protection execution interface, an overcurrent short circuit detection interface and a voltage detection interface. The battery system further comprises: Battery cell, including positive electrode and negative electrode; a second resistor, wherein a first end of the second resistor is electrically connected to the positive electrode of the battery cell, and a second end of the second resistor is electrically connected to the power interface; a first capacitor, wherein a first end of the first capacitor is electrically connected to a second end of the second resistor, and a second end of the first capacitor is electrically connected to the ground interface; a second switch device, wherein a first end of the second switch device is electrically connected to the voltage detection interface, a first end of the second switch device is electrically connected to the negative electrode of the battery cell, and a control end of the second switch device is electrically connected to the discharge protection execution interface; a third switch device, wherein a first end of the third switch device is electrically connected to a second end of the second switch device, a control end of the third switch device is electrically connected to the charging protection execution interface, and a second end of the third switch device is electrically connected to the overcurrent short circuit detection interface; A first interface, the alarm sending interface is electrically connected to the alarm through the first interface.

9. The battery system according to claim 8, characterized in that: The battery system further comprises: a second capacitor, wherein a first end of the second capacitor is electrically connected to a first end of the second switch device, and a second end of the second capacitor is electrically connected to a second end of the third switch device; a third capacitor, wherein a first end of the third capacitor is electrically connected to the positive electrode of the battery cell, and a second end of the third capacitor is grounded; a third resistor, wherein the first end of the second switch device is electrically connected to the negative electrode of the battery cell through the third resistor; A fourth resistor, the second end of the third switch device is electrically connected to the over-current short-circuit detection interface through the fourth resistor.

10. The battery system according to claim 7, characterized in that: The battery system further comprises: Second interface; The third interface; Fourth interface; a thermistor, wherein a first end of the thermistor is electrically connected to an input end of the second interface, and a second end of the thermistor is grounded; a fifth resistor, a first end of the fifth resistor being electrically connected to the input end of the third interface, and a second end of the fifth resistor being grounded; A transient suppression diode, wherein a first end of the transient suppression diode is electrically connected to the input end of the fourth interface, and a second end of the transient suppression diode is grounded.

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