CN219980425U - Battery protection circuit and electronic equipment - Google Patents
Battery protection circuit and electronic equipment Download PDFInfo
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- CN219980425U CN219980425U CN202321022246.XU CN202321022246U CN219980425U CN 219980425 U CN219980425 U CN 219980425U CN 202321022246 U CN202321022246 U CN 202321022246U CN 219980425 U CN219980425 U CN 219980425U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model discloses a battery protection circuit and electronic equipment relates to the protection field that charges, and battery protection circuit includes protection module, and protection module includes protection chip, current sampling resistor, switching device and protection branch road, and switching device is established ties and is connected to protection chip with the return circuit that charges, and protection branch road connects in parallel at current sampling resistor's both ends, and protection branch road sets up bleeder resistor and detection node, and according to the voltage value that detection node detected, protection chip passes through switching device control return circuit break-make that charges. The voltage divider resistor is arranged, the voltage of the voltage divider resistor is detected, the current passing through the current sampling resistor is regulated by changing the resistance value of the voltage divider resistor, the protection current of the batteries with different charging powers is regulated, the voltage detected by the protection chip is matched with the protection chip, different protection chips are not required to be developed for the batteries with different power levels, the universality of the protection chip is improved, and the production cost is reduced.
Description
Technical Field
The disclosure relates to the technical field of charging protection, and in particular relates to a battery protection circuit and electronic equipment.
Background
In order to avoid damage to the battery or shortening of the service life of the battery caused by exceeding a safety threshold value (i.e., charge overcurrent) of the current during charge and discharge of the battery, a battery protection circuit is an indispensable part of the charge and discharge of the battery.
However, taking a mobile phone as an example, different types of mobile phones are provided with different batteries according to the model characteristics, the power levels of the different batteries may be different, and the protection currents between the different power levels are also different. The detection value of the protection chip is usually a fixed value, so in order to protect the charging and discharging processes of the batteries with different power levels of different models, different protection chips and protection circuits are required to be correspondingly arranged for each power level, and the research and development period of the electronic equipment can be greatly prolonged by researching and developing the protection chips with different specifications, which is also unfavorable for the miniaturization development of the batteries and the reduction of the production cost.
Disclosure of Invention
In order to overcome the problems in the related art, the present disclosure provides a battery protection circuit and an electronic device.
According to a first aspect of the present disclosure, there is provided a battery protection circuit including at least one protection module, each of the protection modules including:
the protection chip is arranged in parallel with the charging loop of the battery;
the switching device is arranged in series in the charging loop and is electrically connected to the protection chip;
the current sampling resistor is arranged in series in the charging loop;
the protection branch is arranged at two ends of the current sampling resistor in parallel, and is provided with at least two voltage dividing resistors arranged in series;
the protection branch circuit is provided with a detection node, the detection node is located between two adjacent voltage dividing resistors in at least two voltage dividing resistors, a detection pin of the protection chip is electrically connected to the detection node, the protection chip is used for sending a control signal to the switching device so as to control the charging loop to be conducted or disconnected, and the control signal is determined based on detection information received by the detection pin.
Optionally, the protection module further includes a temperature detection branch, the temperature detection branch is connected in parallel to two ends of a part of the voltage dividing resistors in the at least two voltage dividing resistors, and the temperature detection branch is provided with a temperature measuring resistor.
Optionally, the temperature measuring resistor is set to have a resistance value inversely related to temperature.
Optionally, the protection branch circuit includes first bleeder resistor and the second bleeder resistor of establishing ties setting, the detection node set up in first bleeder resistor with between the second bleeder resistor, first bleeder resistor set up in the ground pin of protection chip with between the detection pin.
Optionally, the temperature measuring resistor is connected in parallel to two ends of the second voltage dividing resistor.
Optionally, the switching device includes a first switch and a second switch disposed in series, and the first switch and the second switch are respectively electrically connected with different control pins of the protection chip.
Optionally, the first switch is an N-type transistor or a P-type transistor; and/or the number of the groups of groups,
the second switch is an N-type transistor or a P-type transistor.
Optionally, the battery protection circuit includes a primary protection module and a secondary protection module, where the primary protection module and the secondary protection module are connected in parallel to the charging circuit.
Optionally, the battery protection circuit further includes an encryption chip, and the encryption chip is electrically connected with the charging circuit.
According to a second aspect of the present disclosure, there is provided an electronic device comprising a battery and a charging circuit electrically connected with the battery, and a battery protection circuit as described in the first aspect of the present disclosure, the battery protection circuit being connected to the charging circuit.
The technical scheme provided by the embodiment of the disclosure can comprise the following beneficial effects: the voltage divider resistor is arranged, the voltage of the voltage divider resistor is detected, the current passing through the current sampling resistor is regulated by changing the resistance value of the voltage divider resistor, the protection current of the batteries with different charging powers is regulated, the voltage detected by the protection chip is matched with the protection chip, different protection chips are not required to be developed for the batteries with different power levels, the universality of the protection chip is improved, and the production cost is reduced.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the utility model and together with the description, serve to explain the principles of the utility model.
Fig. 1 is a schematic diagram of a battery protection circuit shown according to an exemplary embodiment.
Fig. 2 is a partial enlarged view of the area a in fig. 1.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the utility model. Rather, they are merely examples of apparatus and methods consistent with aspects of the utility model as detailed in the accompanying claims.
At present, the charging power of the battery of the mobile terminal device, for example, a mobile phone is relatively dispersed, that is, different batteries may be charged with different charging powers, and the protection current of the battery of each power class is different, and a specific set of protection circuits is required to be corresponding to each set of protection circuits, so that each set of protection circuits needs to develop a corresponding protection chip to support specific protection parameters. However, the development period of the protection chip is difficult to meet the development progress of the current mobile phone, and the development period cannot be guaranteed. Meanwhile, the development cost of the protection chip is high, so that the development cost of the mobile terminal is increased intangibly.
In addition, the battery temperature in the charging process of the mobile terminal needs to be strictly monitored so as to avoid potential safety hazards in the charging process. The current battery temperature protection function depends on setting a protection function on a protection chip and matching with a peripheral circuit, which is not beneficial to reducing the cost of the battery and simultaneously is not beneficial to the miniaturization development.
In order to solve the above problems, the present disclosure provides a battery protection circuit and an electronic device, the battery protection circuit includes at least one protection module, the protection module includes a protection chip connected in parallel with a charging loop, a current sampling resistor connected in series with the charging loop, a switching device and a protection branch, the switching device is connected in series with the charging loop and electrically connected to the protection chip, the protection branch is connected in parallel with two ends of the current sampling resistor, the protection branch includes at least two voltage dividing resistors and a detection node which are arranged in series, the detection node is located between two adjacent voltage dividing resistors, the detection pin is electrically connected to the detection node, and the protection chip controls the charging loop to be turned on or off through the switching device. The voltage divider resistor is arranged, the voltage of the voltage divider resistor is detected, the current passing through the current sampling resistor is regulated by changing the resistance value of the voltage divider resistor, the protection current of the batteries with different charging powers is regulated, the voltage detected by the protection chip is matched with the protection chip, different protection chips are not required to be developed for the batteries with different power levels, the universality of the protection chip is improved, and the production cost is reduced.
According to an exemplary embodiment, the present embodiment provides a battery protection circuit, which is applied to a battery of a mobile terminal device, for example, a mobile phone, and when the battery is charged, ac power is converted into dc power through a dc charger, the dc power supplies power to the mobile phone through a TYPE-C interface of the mobile phone, and after the dc power received by the TYPE-C interface is filtered through a main board charging circuit, the battery is charged through the battery protection circuit of the present disclosure.
As shown in fig. 1 and 2, the battery protection circuit provided in the exemplary embodiment of the present disclosure includes at least one protection module, the protection module includes a protection chip 21, the protection chip 21 is disposed in parallel to a charging circuit 10 of a battery 11, the charging circuit 10 includes a positive electrode terminal p+ and a negative electrode terminal P-, the battery 11 is disposed between the positive electrode terminal p+ and the negative electrode terminal P-, and the battery 11 is charged through the charging circuit 10.
The protection module further includes a switching device 22, the switching device 22 is disposed in the charging circuit 10 in series and electrically connected to the protection chip 21, and the switching device 22 can be turned on or off by the on/off of the switching device 22 to turn off the charging circuit 10 when the battery 11 is overcharged or the charging current exceeds a preset threshold value, for example, so as to protect the battery 11. When the battery 11 needs to be charged, a wired charger (not shown) is connected to the positive terminal p+ and the negative terminal P-, and the control switch device 22 is turned on, so that the charging circuit 10 is turned on to charge the battery 11.
The protection module further comprises a current sampling resistor 23, the current sampling resistor 23 is arranged in the charging loop 10 in series, two ends of the current sampling resistor 23 are connected in parallel with a protection branch 24, the protection branch 24 is provided with at least two voltage dividing resistors 25 which are arranged in series, a detection node is arranged between two adjacent voltage dividing resistors 25 in the at least two voltage dividing resistors 25, the detection node (referring to a first detection node 261 and a second detection node 262 shown in fig. 2) is electrically connected with a detection pin of the protection chip 21, the detection pin receives detection information, the protection chip 21 is used for determining a control signal based on the detection information, the control signal is used for controlling the on-off of a switching device and sending the control signal to the switching device 22, and the on-off of the charging loop 10 is controlled by controlling the on-off of the switching device 22, so that circuit protection is realized. For example, a preset voltage threshold is set in the protection chip 21, when the voltage value at two ends of the voltage dividing resistor 25 detected by the protection chip exceeds the preset voltage threshold, which indicates that the current value on the current sampling resistor 23 exceeds the preset current threshold, a charging overcurrent phenomenon occurs, and in order to protect the battery 11, the protection chip 21 controls the switching device 22 to be turned off, the charging circuit 10 is turned off, and the charging process of the battery 11 is stopped.
In this embodiment, set up bleeder resistor and detect bleeder resistor's voltage, through changing bleeder resistor's resistance, adjust the electric current through the electric current sampling resistance, when guaranteeing to adjust the protection electric current of the battery of different charge power, make the voltage that protection chip detected match with protection chip, need not develop different protection chips to the battery of different power grades, promoted protection chip's commonality, be favorable to reducing manufacturing cost.
In some embodiments, the protection modules of the battery protection circuit include a primary protection module and a secondary protection module, where the primary protection module is disposed in parallel with the secondary protection module in the charging loop 10 of the battery 11. As shown in fig. 1 and 2, the primary protection module includes a first protection chip 211, the first protection chip 211 is disposed in parallel with the charging circuit 10 of the battery 11, a first pin 2111 of the first protection chip 211 is connected in series with a first resistor R1 and then connected to a positive terminal p+ of the charging circuit 10, a second pin 2114 is connected in series with a second resistor R2 and then connected to a negative terminal P-of the charging circuit 10, a first capacitor C1 is disposed in parallel between the first pin 2111 and a first ground pin 2112, and the first ground pin 2112 is grounded. The switching device 22 includes a first switch Q1 and a second switch Q2, where the first switch Q1 and the second switch Q2 are serially connected to a negative electrode P-of the charging circuit 10, and the first switch Q1 and the second switch Q2 are electrically connected to different pins of the first protection chip 211, so as to control the first switch Q1 and the second switch Q2 respectively, and the first protection chip 211 can control the first switch Q1 and the second switch Q2 to be connected or disconnected respectively, thereby controlling the opening and closing of the charging circuit 10.
The first current sampling resistor 231 is serially connected to the negative electrode P-of the charging circuit 10 of the battery 11, the two ends of the first current sampling resistor 231 are connected in parallel to form a first protection branch 241, the first protection branch 241 is provided with at least two voltage dividing resistors 25 which are serially connected, a first detection node 261 is arranged between two adjacent voltage dividing resistors 25 in the at least two voltage dividing resistors 25, and the first detection node 261 is electrically connected with a first detection pin 2113 of the first protection chip 211.
The first pin 2111 is a VDD pin of the first protection chip 211, the first ground pin 2112 is a VSS pin of the first protection chip 211, the first detection pin 2113 is a CS pin of the first protection chip 211, and the second pin 2114 is a VM pin of the first protection chip 211.
Still referring to fig. 1 and 2, the secondary protection module includes a second protection chip 212, the second protection chip 212 is parallel-connected to the charging circuit 10 of the battery 11, the switching device 22 is serial-connected to the negative terminal P-of the charging circuit 10, the switching device 22 includes a third switch Q3 and a fourth switch Q4, the third switch Q3 and the fourth switch Q4 are respectively connected with different pins of the second protection chip 212, and the second protection chip 212 respectively and independently controls the third switch Q3 and the fourth switch Q4. The third pin 2121 of the second protection chip 212 is connected in series with the third resistor R3 and then connected to the positive terminal p+ of the charging circuit 10, the fourth pin 2124 is connected in series with the fourth resistor R4 and then connected to the negative terminal P-of the charging circuit 10, a second capacitor C2 is arranged in parallel between the third pin 2121 and the second ground pin 2122, and the second ground pin 2122 is grounded. The switching device 22 is electrically connected to the second protection chip 212, the second current sampling resistor 232 is serially connected to the negative terminal P-of the charging circuit 10, the two ends of the second current sampling resistor 232 are parallelly connected to the second protection branch 242, the second protection branch 242 is provided with at least two serially arranged voltage dividing resistors 25, a second detection node 262 is arranged between two adjacent voltage dividing resistors 25 in the at least two voltage dividing resistors 25, and the second detection node 262 is electrically connected to a second detection pin 2123 of the second protection chip 212.
The third pin 2121 is a VDD pin of the second protection chip 212, the second ground pin 2122 is a VSS pin of the second protection chip 212, the second detection pin 2123 is a CS pin of the second protection chip 212, and the fourth pin 2124 is a VM pin of the second protection chip 212.
It should be noted that, the primary protection module and the secondary protection module may be only provided with any one of the two, or of course, the primary protection module and the secondary protection module may be simultaneously provided to protect the battery, so that when the primary protection module fails or is damaged, the secondary protection module may still be used for circuit protection, thereby improving the safety and reliability of the battery protection circuit. It can be understood that, according to the difference of application scenarios, three-level protection modules or more protection modules can be further provided to form multi-level protection, so as to improve the protection level and the protection reliability.
In some embodiments, the protection branch 24 comprises two voltage dividing resistors 25 arranged in series. The voltage dividing resistor 25 in the first protection branch 241 includes a first voltage dividing resistor 251 and a second voltage dividing resistor 252, the first current sampling resistor 231 is connected in series at the negative terminal P-of the charging loop 10, and the first current sampling resistor 231 is connected in parallel at two ends of the first voltage dividing resistor 251 and the second voltage dividing resistor 252. The first detection node 261 is disposed between the first voltage dividing resistor 251 and the second voltage dividing resistor 252, the first voltage dividing resistor 251 is disposed between the first ground pin 2112 and the first detection pin 2113 of the first protection chip 211, and the first detection node 261 is configured to detect a voltage of the first voltage dividing resistor 251. Assuming that the resistance of the first voltage dividing resistor 251 is R7, the resistance of the second voltage dividing resistor 252 is R8, the resistance of the first current sampling resistor 231 is RS2, the charging overcurrent point of the first protection chip 211 is a first preset voltage threshold Vcoiv1, and the discharging overcurrent point is a second preset voltage threshold Vdoiv1, the first preset current threshold (charging overcurrent protection value) of the first protection chip 211 may be set to- (r7+r8)/R7) ×vcoiv1/RS2, that is, the charging overcurrent protection value to be detected by the first current sampling resistor 231. As can be seen from the above formula, the resistance values of R7 and R8 are adjusted, so that the charging overcurrent protection value detected by the first current sampling resistor 231 can be adjusted according to the power level of the battery, without changing the first preset voltage threshold Vcoiv1 corresponding to the charging overcurrent point of the first protection chip 211, so that it is ensured that the charging overcurrent protection can be provided for various batteries by changing the resistance values of the first voltage dividing resistor 251 and the second voltage dividing resistor 252 without redevelopment of the chip. The discharging process and the charging process may have opposite current directions, i.e., the second preset current threshold (discharge overcurrent protection value) of the first protection chip 211 may be set to (r7+r8)/R7) ×vdoiv1/RS2. The detection principle and effect of the discharge overcurrent protection in the discharge process are the same as those of the charge overcurrent protection, and are not described in detail herein.
The voltage dividing resistor 25 in the second protection branch 242 includes a third voltage dividing resistor 253 and a fourth voltage dividing resistor 254, and the second current sampling resistor 232 is connected in series at the negative terminal P-of the charging circuit 10 and is arranged in parallel at two ends of the third voltage dividing resistor 253 and the fourth voltage dividing resistor 254. The second detection node 262 is disposed between the third voltage dividing resistor 253 and the fourth voltage dividing resistor 254, the third voltage dividing resistor 253 is disposed between the second ground pin 2122 and the second detection pin 2123 of the second protection chip 212, and the second detection node 262 is configured to detect a voltage of the third voltage dividing resistor 253. Assuming that the resistance of the third voltage dividing resistor 253 is R5, the resistance of the fourth voltage dividing resistor 254 is R6, the resistance of the second current sampling resistor 232 is RS1, the charging overcurrent point of the second protection chip 212 is a third preset voltage threshold Vcoiv2, and the discharging overcurrent point is a fourth preset voltage threshold Vdoiv2, the third preset current threshold (charging overcurrent protection value) of the second protection chip 212 may be set to- (r5+r6)/R5) ×vcoiv2/RS1, that is, the charging overcurrent protection value to be detected by the second current sampling resistor 232. As can be seen from the above formula, the resistance values of R5 and R6 are adjusted, so that the charging overcurrent protection value detected by the second current sampling resistor 232 can be adjusted according to the power level of the battery, without changing the first preset voltage threshold Vcoiv2 corresponding to the charging overcurrent point of the second protection chip 212, so that the charging overcurrent protection can be provided for various batteries by changing the resistance values of the third voltage dividing resistor 253 and the fourth voltage dividing resistor 254 without developing the chip again. The current direction of the discharging loop and the charging loop 10 is opposite, that is, the fourth preset current threshold (discharge overcurrent protection value) of the second protection chip 212 may be set to (r5+r6)/R5) ×vdoiv2/RS1. The detection principle and effect of the discharge overcurrent protection in the discharge process are the same as those of the charge overcurrent protection, and are not described in detail herein. In some embodiments, the first switch Q1 and the second switch Q2 are electrically connected to different control pins of the first protection chip 211, and the third switch Q3 and the fourth switch Q4 are electrically connected to different control pins of the second protection chip 212, respectively. As shown in fig. 1 and 2, the primary protection module includes a first switch Q1 and a second switch Q2, where the first switch Q1 and the second switch Q2 are connected in series with the negative terminal P-of the charging loop 10, the second switch Q2 is electrically connected with the first control pin 2115 of the first protection chip 211, and the first switch Q1 is electrically connected with the second control pin 2116 of the first protection chip 211. The first control pin 2115 is a CO pin of the first protection chip 211, and the second control pin 2116 is a DO pin of the first protection chip 211.
The second-stage protection module includes a third switch Q3 and a fourth switch Q4, where the third switch Q3 and the fourth switch Q4 are connected in series with the negative terminal P-of the charging loop 10, the fourth switch Q4 is electrically connected with the third control pin 2125 of the second protection chip 212, and the third switch Q3 is electrically connected with the fourth control pin 2126 of the second protection chip 212. The second switch Q2 and the fourth switch Q4 are used for controlling the opening and closing of the charging circuit 10, and the first switch Q1 and the third switch Q3 are used for controlling the opening and closing of the discharging circuit. The third control pin 2125 is a CO pin of the second protection chip 212, and the fourth control pin 2126 is a DO pin of the second protection chip 212.
In some embodiments, the first switch Q1 is an N-type transistor or a P-type transistor, and/or the second switch Q2 is an N-type transistor or a P-type transistor. In one example, the first switch Q1 and the second switch Q2 are both N-type transistors, in another example, the first switch Q1 and the second switch Q2 are both P-type transistors, in yet another example, the first switch Q1 is an N-type transistor, the second switch Q2 is a P-type transistor, in yet another example, the first switch Q1 is an N-type transistor or a P-type transistor, and the second switch Q2 is another unidirectional switching device. The specific types of the first switch Q1 and the second switch Q2 may be selected according to actual needs, which is not excessively limited in the disclosure, and in addition, it is understood that the structure of the third switch Q3 is the same as that of the first switch Q1, and the structure of the fourth switch Q4 is the same as that of the second switch Q2, which is not described herein. When each switch selects an N-type transistor, and when the N-type transistor is required to be conducted, the corresponding pin of the protection chip outputs a high level; when the P-type transistor is selected by each switch, the corresponding pin of the protection chip outputs a low level when the P-type transistor is required to be conducted.
In some embodiments, three voltage dividing resistors or four voltage dividing resistors may be set, so that more voltage dividing levels may be set, and by adjusting the positions of the detection nodes between the voltage dividing resistors, the requirements of the overcurrent protection currents corresponding to the power levels of the various batteries may be adapted.
In some embodiments, the protection module further includes a temperature detection branch connected in parallel to two ends of a part of the voltage dividing resistors 25 of the at least two voltage dividing resistors 25, where the temperature detection branch is provided with a temperature measuring resistor, and the temperature measuring resistor is set to have a resistance value that is inversely related to temperature, that is, the resistance value of the temperature measuring resistor decreases with the increase of temperature, where the temperature measuring resistor may be, for example, a thermistor with a negative temperature coefficient.
In one example, the thermometric resistors include a first thermometric resistor RT1 and a second thermometric resistor RT2. The second temperature measuring resistor RT2 is connected in parallel with two ends of the second voltage dividing resistor 252, the second temperature measuring resistor RT2 and the second voltage dividing resistor 252 are connected in parallel and then connected in series with the first voltage dividing resistor 251 to form a first temperature detection branch, and the first current sampling resistor 231 is connected in parallel with two ends of the first temperature detection branch. The first temperature measuring resistor RT1 is connected in parallel to two ends of the fourth voltage dividing resistor 254, the first temperature measuring resistor RT1 is connected in parallel to the fourth voltage dividing resistor 254 and then connected in series with the third voltage dividing resistor 253 to form a second temperature detection branch, and the second current sampling resistor 232 is connected in parallel to two ends of the second temperature detection branch. Illustratively, the resistances of the first temperature resistor RT1 and the second temperature resistor RT2 at normal temperature are in the order of hundred k, the resistances of the first voltage dividing resistor 251, the second voltage dividing resistor 252, the third voltage dividing resistor 253 and the fourth voltage dividing resistor 254 are in the order of k, and the influence of the parallel resistances of the first temperature resistor RT1 and the second temperature resistor RT2 on the parallel resistances of the first voltage dividing resistor 251 and the second voltage dividing resistor 252 and the parallel resistances of the third voltage dividing resistor 253 and the fourth voltage dividing resistor 254 at normal temperature is almost zero. When the temperature rises, the resistance of the first temperature measuring resistor RT1 and the second temperature measuring resistor RT2 is obviously reduced, the influence on the parallel resistance of the voltage dividing resistor 25 is obviously improved, and therefore the temperature anomaly detection is realized, so that the circuit is cut off in time when the circuit temperature is too high, and the service life of the battery 11 is prevented from being shortened or damaged.
In one example, the battery protection circuit further includes a cryptographic chip 30. The encryption chip 30 is electrically connected to the charging circuit 10. The fifth pin 31 of the encryption chip is connected with the sixth pin 32, the sixth pin 32 is connected with the encryption IO, the third grounding pin 33 is connected with the fourth grounding pin 34 and then connected with the third capacitor C3 in series, the other end of the third capacitor C3 is connected to the positive pole P+ of the charging loop 10, and the third grounding pin 33, the fourth grounding pin 34, the fifth grounding pin 35 and the sixth grounding pin 36 are all grounded. The encryption chip 30 is used for encrypting the battery 11, and carrying out power-limited charging on the forged battery, so as to prevent the forged battery from being used instead of the original battery.
According to an exemplary embodiment, still referring to fig. 1 and 2, the present embodiment provides an electronic device, which may be a mobile terminal, a smart watch, a smart bracelet, a bluetooth headset, or the like, capable of being charged and discharged by a battery, and the electronic device includes a battery 11 and a charging circuit 10 electrically connected to the battery 11, and a battery protection circuit as described in the above embodiments, and the battery protection circuit is connected to the charging circuit 10.
In this embodiment, the detected voltage can be matched with the protection chip by changing the resistance value of the voltage dividing resistor, so that different protection chips are not required to be developed when the charging loops with different power levels are subjected to circuit protection, which is beneficial to reducing the production cost of electronic equipment and shortening the product research and development period. Meanwhile, the battery protection circuit provided in the embodiment of the disclosure is arranged on the electronic equipment, so that potential safety risks in the battery charging and discharging process can be effectively avoided, and the problems of liquid leakage, even fire and combustion and the like caused by charging and discharging of the battery cell at high temperature are avoided.
Other embodiments of the utility model will be apparent to those skilled in the art from consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the utility model being indicated by the following claims.
It is to be understood that the utility model is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the utility model is limited only by the appended claims.
Claims (10)
1. A battery protection circuit comprising at least one protection module, each protection module comprising:
the protection chip is arranged in parallel with the charging loop of the battery;
the switching device is arranged in series in the charging loop and is electrically connected to the protection chip;
the current sampling resistor is arranged in series in the charging loop;
the protection branch is arranged at two ends of the current sampling resistor in parallel, and is provided with at least two voltage dividing resistors arranged in series;
the protection branch circuit is provided with a detection node, the detection node is located between two adjacent voltage dividing resistors in at least two voltage dividing resistors, a detection pin of the protection chip is electrically connected to the detection node, the protection chip is used for sending a control signal to the switching device so as to control the charging loop to be conducted or disconnected, and the control signal is determined based on detection information received by the detection pin.
2. The battery protection circuit of claim 1, wherein the protection module further comprises a temperature detection branch connected in parallel across a portion of the voltage dividing resistors of the at least two voltage dividing resistors, the temperature detection branch providing a temperature measurement resistor.
3. The battery protection circuit of claim 2, wherein the temperature sensing resistor is configured to have a resistance value that is inversely related to temperature.
4. The battery protection circuit of claim 2 or 3, wherein the protection branch comprises a first voltage dividing resistor and a second voltage dividing resistor which are arranged in series, the detection node is arranged between the first voltage dividing resistor and the second voltage dividing resistor, and the first voltage dividing resistor is arranged between a ground pin and the detection pin of the protection chip.
5. The battery protection circuit of claim 4, wherein the temperature measuring resistor is connected in parallel to both ends of the second voltage dividing resistor.
6. A battery protection circuit according to any one of claims 1 to 3, wherein the switching device comprises a first switch and a second switch arranged in series, the first switch and the second switch being electrically connected to different control pins of the protection chip, respectively.
7. The battery protection circuit of claim 6, wherein the first switch is an N-type transistor or a P-type transistor; and/or the number of the groups of groups,
the second switch is an N-type transistor or a P-type transistor.
8. A battery protection circuit according to any one of claims 1 to 3, wherein the battery protection circuit includes a primary protection module and a secondary protection module, the primary protection module being disposed in parallel with the secondary protection module in the charging circuit.
9. A battery protection circuit according to any one of claims 1 to 3, further comprising a cryptographic chip electrically connected to the charging circuit.
10. An electronic device comprising a battery and a charging circuit electrically connected to the battery, and a battery protection circuit according to any one of claims 1 to 9, the battery protection circuit being connected to the charging circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321022246.XU CN219980425U (en) | 2023-04-28 | 2023-04-28 | Battery protection circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321022246.XU CN219980425U (en) | 2023-04-28 | 2023-04-28 | Battery protection circuit and electronic equipment |
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| Publication Number | Publication Date |
|---|---|
| CN219980425U true CN219980425U (en) | 2023-11-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202321022246.XU Active CN219980425U (en) | 2023-04-28 | 2023-04-28 | Battery protection circuit and electronic equipment |
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| CN (1) | CN219980425U (en) |
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