CN209948752U - Battery protection circuit with electric quantity display - Google Patents
Battery protection circuit with electric quantity display Download PDFInfo
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- CN209948752U CN209948752U CN201921005319.8U CN201921005319U CN209948752U CN 209948752 U CN209948752 U CN 209948752U CN 201921005319 U CN201921005319 U CN 201921005319U CN 209948752 U CN209948752 U CN 209948752U
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Abstract
The utility model discloses a charge display battery protection circuit, which comprises a charge-discharge main control circuit, a charge-discharge switch circuit and an indicator light, wherein the charge-discharge main control circuit is connected with a plurality of lithium batteries and comprises a charge-discharge main control integrated circuit and a peripheral circuit thereof; the charging and discharging switch circuit is respectively connected with the charging and discharging main control circuit and the multiple lithium batteries and is used for controlling the charging and discharging of the multiple lithium batteries under the action of the charging and discharging main control circuit; the indicating lamp is connected with the charging and discharging main control circuit and used for indicating charging and discharging under the action of the charging and discharging main control circuit and displaying the electric quantity of the battery. The electric quantity display battery protection circuit collects the state of the lithium battery through the charge-discharge main control integrated circuit and indicates the state through the indicating lamp, and the electric quantity indicating circuit is simple and stable in indicating state.
Description
Technical Field
The utility model relates to a lithium battery protection technical field especially relates to a charge display battery protection circuit.
Background
In recent years, secondary batteries such as lithium (Li) ion batteries have been widely used. The lithium (Li) ion battery may be overcharged or overdischarged during use, etc. The battery may have an overcurrent phenomenon caused by a short circuit of an external load during use, and the overcurrent phenomenon may cause overheating of a discharge circuit. And even burn out the circuit board.
The existing lithium battery management circuit is relatively complex, the failure rate is relatively high, the integration level is relatively low, the electric quantity indication realization circuit is relatively complex, and the indication state is unstable.
SUMMERY OF THE UTILITY MODEL
The present invention aims at solving at least one of the technical problems in the related art to a certain extent. Therefore, an object of the present invention is to provide a charged battery protection circuit.
In order to achieve the above object, according to the utility model discloses electrified volume display battery protection circuit, include:
the charging and discharging main control circuit is connected with the multiple lithium batteries and comprises a charging and discharging main control integrated circuit and a peripheral circuit thereof;
the charging and discharging switch circuit is respectively connected with the charging and discharging main control circuit and the multiple lithium batteries and is used for controlling the charging and discharging of the multiple lithium batteries under the action of the charging and discharging main control circuit;
and the indicating lamp is connected with the charging and discharging main control circuit and used for charging and discharging indication under the action of the charging and discharging main control circuit and displaying the electric quantity of the battery.
Further, according to the utility model discloses an embodiment, charge-discharge main control circuit includes: charging and discharging master control integrated chip and peripheral circuit thereof.
Further, according to the utility model discloses an embodiment, the main control integrated chip that charges and discharges is BQ40Z50 integrated circuit.
Further, according to an embodiment of the present invention, the indicator light includes: first pilot lamp, second pilot lamp, third pilot lamp and fourth pilot lamp, first pilot lamp, second pilot lamp, third pilot lamp and fourth pilot lamp respectively through the pilot lamp interface with charge and discharge master control integrated chip's pilot lamp control end is connected.
Further, according to the utility model discloses an embodiment, the electrified volume display battery protection circuit still includes: the current detection circuit comprises a first resistor RI1 and a second resistor RI2, one ends of the first resistor RI1 and the second resistor RI2 are connected with the negative end of the multiple lithium batteries, and the other ends of the first resistor RI1 and the second resistor RI2 are connected with a charge and discharge load and are connected with the positive end of the multiple lithium batteries through the charge and discharge load and a charge and discharge control switch circuit.
Further, according to the utility model discloses an embodiment, the electrified volume display battery protection circuit still includes: the temperature detection circuit comprises a thermistor, one end of the thermistor is connected with a first temperature detection end of the charging and discharging main control integrated chip, and the other end of the thermistor is connected with a reference ground.
Further, according to the utility model discloses an embodiment, charge and discharge switch circuit includes:
a charge switch circuit, the charge switch circuit comprising: the charging control circuit comprises a first MOS transistor Q18, a second MOS transistor Q20, a third MOS transistor Q22 and a fourth MOS transistor Q24, wherein controlled ends of the first MOS transistor Q18, the second MOS transistor Q20, the third MOS transistor Q22 and the fourth MOS transistor Q24 are respectively connected with a charging control end of the charging and discharging main control integrated chip; the sources of the first MOS transistor Q18, the second MOS transistor Q20, the third MOS transistor Q22 and the fourth MOS transistor (Q24) are respectively connected with the positive ends of the multiple lithium batteries;
a discharge switch circuit, the discharge switch circuit comprising: controlled ends of a fifth MOS transistor Q17, a sixth MOS transistor Q19, a seventh MOS transistor Q21 and an eighth MOS transistor Q23, the controlled ends of the fifth MOS transistor Q17, the sixth MOS transistor Q19, the seventh MOS transistor Q21 and the eighth MOS transistor Q23 are respectively connected with a discharge control end of the charge-discharge main control integrated chip; the sources of the fifth MOS transistor Q17, the sixth MOS transistor Q19, the seventh MOS transistor Q21 and the eighth MOS transistor Q23 are respectively connected with the drains of the fifth MOS transistor Q17, the sixth MOS transistor Q19, the seventh MOS transistor Q21 and the eighth MOS transistor Q23, and the drains of the fifth MOS transistor Q17, the sixth MOS transistor Q19, the seventh MOS transistor Q21 and the eighth MOS transistor Q23 are respectively connected with the negative terminal of the multi-lithium battery.
The embodiment of the utility model provides a charge display battery protection circuit, including charge and discharge main control circuit and multisection lithium cell connection, charge and discharge main control circuit includes charge and discharge main control integrated circuit and peripheral circuit; the charging and discharging switch circuit is respectively connected with the charging and discharging main control circuit and the multiple lithium batteries and is used for controlling the charging and discharging of the multiple lithium batteries under the action of the charging and discharging main control circuit; the phenomenon that the discharge loop is overheated due to overcurrent is avoided, and the circuit board is burnt out. Realize the lithium battery management through charge-discharge main control integrated circuit, the integrated level is high, and the fault rate is lower relatively, the pilot lamp with charge-discharge main control circuit connects, is used for charge-discharge indication is carried out under charge-discharge main control circuit's the effect, and battery power shows. The lithium battery state is collected through the charge-discharge main control integrated circuit, and the indication is carried out through the indicating lamp, so that the electric quantity indicating circuit is simple, and the indicating state is stable.
Drawings
Fig. 1 is a block diagram of a battery protection circuit with a charge display according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a charging/discharging main control circuit and a temperature detection circuit provided by an embodiment of the present invention;
fig. 3 is a circuit diagram of a charge/discharge switch provided in an embodiment of the present invention;
fig. 4 is a circuit diagram of the current detection provided by the embodiment of the present invention;
fig. 5 is an interface diagram of an indicator light provided by an embodiment of the present invention.
Reference numerals:
a charge amount display battery protection circuit 10;
an indicator light 101;
an indicator light interface 1011;
a charge and discharge main control circuit 102;
a lithium battery interface 103;
a charge and discharge switching circuit 104;
a charge switch circuit 1041;
a discharge switch circuit 1042;
a current detection circuit 105;
a temperature detection circuit 106;
a configuration host 20 is shown.
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
In order to make the technical field person understand the scheme of the present invention better, the following will combine the drawings in the embodiments of the present invention to clearly and completely describe the technical scheme in the embodiments of the present invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Referring to fig. 1, an embodiment of the present invention provides a battery protection circuit 10 with charge display, including: the charging and discharging control system comprises a charging and discharging main control circuit 102, a charging and discharging switch circuit 104 and an indicator light 101, wherein the charging and discharging main control circuit 102 is connected with a plurality of lithium batteries, and the charging and discharging main control circuit 102 comprises a charging and discharging main control integrated circuit and a peripheral circuit thereof; the charging and discharging main control integrated circuit is a control center of the whole battery protection circuit and is respectively connected with the multiple lithium batteries so as to respectively detect the voltage of each lithium battery.
The charging and discharging switch circuit 104 is respectively connected with the charging and discharging main control circuit 102 and the plurality of lithium batteries and is used for controlling the charging and discharging of the plurality of lithium batteries under the action of the charging and discharging main control circuit 102; the charging and discharging switch circuit 104 is arranged on a charging and discharging loop of a plurality of lithium batteries, when the charging and discharging main control power detects that the lithium batteries are overcharged and overdischarged, an overcharge and overdischarge control signal is output and acts on the charging and discharging switch circuit 104, and the charging and discharging loop is controlled to be disconnected through the charging and discharging switch circuit 104. So as to carry out overcharge and overdischarge protection on the lithium battery.
The indicator light 101 is connected to the charging and discharging main control circuit 102, and is used for indicating charging and discharging under the action of the charging and discharging main control circuit 102, and displaying the battery power. The charge and discharge main control circuit 102 is connected to the lithium battery, so as to detect the voltage of the lithium battery. And the voltage value of the lithium battery is transmitted to the indicating lamp 101, and the electric quantity of the lithium battery can be displayed through the indicating lamp 101. In addition, the charge/discharge main control circuit 102 may also control the indicator light 101 to indicate the charge/discharge state.
The embodiment of the utility model provides a charge display battery protection circuit 10, including charge and discharge main control circuit 102 and multisection lithium cell connection, charge and discharge main control circuit 102 includes charge and discharge main control integrated circuit and peripheral circuit; the charging and discharging switch circuit 104 is respectively connected with the charging and discharging main control circuit 102 and the plurality of lithium batteries and is used for controlling the charging and discharging of the plurality of lithium batteries under the action of the charging and discharging main control circuit 102; the phenomenon that the discharge loop is overheated due to overcurrent is avoided, and the circuit board is burnt out. Realize the lithium battery management through charge and discharge master control integrated circuit, the integrated level is high, and the fault rate is lower relatively, and pilot lamp 101 is connected with charge and discharge master control circuit 102 for carry out charge and discharge instruction under charge and discharge master control circuit 102's effect, and the battery power shows. Gather the lithium cell state through charge-discharge master control integrated circuit to instruct through pilot lamp 101, electric quantity indicating circuit is simple, and the instruction state is stable.
Referring to fig. 1 and 2, the charge display battery protection circuit 10, the charge/discharge main control circuit 102 includes: charging and discharging master control integrated chip and peripheral circuit thereof. As shown in fig. 2, the charging and discharging master control integrated chip is a BQ40Z50 integrated circuit. And a communication interface is arranged on the charging and discharging main control integrated chip and is connected with an upper computer.
Referring to fig. 1 and 5, the indicator light 101 includes: the charging and discharging master control integrated chip comprises a first indicator light 101, a second indicator light 101, a third indicator light 101 and a fourth indicator light 101, wherein the first indicator light 101, the second indicator light 101, the third indicator light 101 and the fourth indicator light 101 are respectively connected with a control end of the indicator light 101 of the charging and discharging master control integrated chip through an indicator light interface 1011. The charging and discharging main control integrated chip controls the first indicator light 101, the second indicator light 101, the third indicator light 101 and the fourth indicator light 101 to be turned on and off through the indicator light interface 1011. So as to display the electric quantity and the charging and discharging states of the lithium battery. For example, the turning on or off of the three indicator lamps 101 may be controlled to indicate the amount of electricity, and the blinking of the moving indicator lamp 101 may be controlled to indicate the charge and discharge state.
Referring to fig. 1 and 4, the charge display battery protection circuit 10 further includes: the current detection circuit 105 comprises a first resistor RI1 and a second resistor RI2, one end of the first resistor RI1 and one end of the second resistor RI2 are connected with the negative end of the multiple lithium batteries, the other end of the first resistor RI1 and the other end of the second resistor RI2 are connected with a charge and discharge load, and the charge and discharge control switch circuit is connected with the positive end of the multiple lithium batteries through the charge and discharge load. The current on the charge and discharge loop can be sampled through the parallel connection of the first resistor RI1 and the second resistor RI 2. And the current sampling value is transmitted to the charge and discharge main control circuit 102, and when the current of the sufficient circuit loop is overlarge, the charge and discharge main control circuit 102 and the charge and discharge switch circuit 104 are used for controlling the closing of the charge and discharge loop, so that the overcurrent and overload protection is performed on the lithium battery and the charge and discharge loop.
Referring to fig. 1 and 2, the charge display battery protection circuit 10 further includes: the temperature detection circuit 106, the temperature detection circuit 106 includes a thermistor, one end of the thermistor is connected with the first temperature detection end of the charge and discharge main control integrated chip, and the other end of the thermistor is connected with the reference ground. Through the thermistor, when the temperature generated by the circuit is higher, the first temperature detection end of the charging and discharging main control integrated chip can detect a temperature signal corresponding to the resistance value due to the change of the resistance value of the thermistor. When the temperature is over-high, the charging and discharging main control circuit 102 and the charging and discharging switch circuit 104 can control the charging and discharging loop to be closed, so that the lithium battery and the charging and discharging loop are protected by the temperature.
Referring to fig. 1 and 3, the charge and discharge switch circuit 104 includes: a charging switch circuit 1041 and a charging switch circuit 1041. The charging switch circuit 1041 comprises a first MOS transistor Q18, a second MOS transistor Q20, a third MOS transistor Q22 and a fourth MOS transistor (Q24), and controlled ends of the first MOS transistor Q18, the second MOS transistor Q20, the third MOS transistor Q22 and the fourth MOS transistor (Q24) are respectively connected with a charging control end of the charging and discharging main control integrated chip; the sources of the first MOS transistor Q18, the second MOS transistor Q20, the third MOS transistor Q22 and the fourth MOS transistor (Q24) are respectively connected with the positive ends of the multiple lithium batteries;
the first MOS transistor Q18, the second MOS transistor Q20, the third MOS transistor Q22, and the fourth MOS transistor (Q24) receive a charge control signal of the charge and discharge main control circuit 102 through a gate. The first MOS transistor Q18, the second MOS transistor Q20, the third MOS transistor Q22, and the fourth MOS transistor (Q24) are controlled to be turned on or off by a charge control signal. Thereby realizing the charge control of the lithium battery. In the embodiment of the present invention, the current amount of the charging loop can be increased by four parallel first MOS transistors Q18, second MOS transistor Q20, third MOS transistor Q22 and fourth MOS transistor (Q24). And realizing the large-current input and output of the charging loop and the on-off control of the loop.
The discharge switch circuit 1042 includes: the controlled terminals of the fifth MOS transistor Q17, the sixth MOS transistor Q19, the seventh MOS transistor Q21 and the seventh MOS transistor Q21, the fifth MOS transistor Q17, the sixth MOS transistor Q19, the seventh MOS transistor Q21 and the eighth MOS transistor Q23 are respectively connected with the discharge control terminal of the charge-discharge main control integrated chip; sources of the fifth MOS transistor Q17, the sixth MOS transistor Q19, the seventh MOS transistor Q21 and the eighth MOS transistor Q23 are connected to drains of the fifth MOS transistor Q17, the sixth MOS transistor Q19, the seventh MOS transistor Q21 and the eighth MOS transistor Q23, respectively, and drains of the fifth MOS transistor Q17, the sixth MOS transistor Q19, the seventh MOS transistor Q21 and the eighth MOS transistor Q23 are connected to a negative terminal of the multi-lithium battery, respectively.
The fifth MOS transistor Q17, the sixth MOS transistor Q19, the seventh MOS transistor Q21, and the eighth MOS transistor Q23 receive a discharge control signal of the charge and discharge main control circuit 102 through a gate. The fifth MOS transistor Q17, the sixth MOS transistor Q19, the seventh MOS transistor Q21, and the eighth MOS transistor Q23 are controlled to be turned on or off by a discharge control signal. Thereby realizing the discharge control of the lithium battery. In the embodiment of the present invention, the current amount of the discharging loop can be increased through four parallel fifth MOS transistors Q17, sixth MOS transistor Q19, seventh MOS transistor Q21 and eighth MOS transistor Q23. The large-current input and output of the discharge loop and the on-off control of the loop are realized.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing detailed description, or equivalent replacements may be made for some of the technical features of the embodiments. All utilize the equivalent structure that the content of the utility model discloses a specification and attached drawing was done, direct or indirect application is in other relevant technical field, all is in the same way the utility model discloses within the patent protection scope.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the principles and spirit of the present invention.
Claims (7)
1. A charged display battery protection circuit, comprising:
the charging and discharging main control circuit is connected with the multiple lithium batteries and comprises a charging and discharging main control integrated circuit and a peripheral circuit thereof;
the charging and discharging switch circuit is respectively connected with the charging and discharging main control circuit and the multiple lithium batteries and is used for controlling the charging and discharging of the multiple lithium batteries under the action of the charging and discharging main control circuit;
and the indicating lamp is connected with the charging and discharging main control circuit and used for charging and discharging indication under the action of the charging and discharging main control circuit and displaying the electric quantity of the battery.
2. The battery protection circuit with charge amount display according to claim 1, wherein the charge and discharge main control circuit comprises: charging and discharging master control integrated chip and peripheral circuit thereof.
3. The battery protection circuit with charge amount display of claim 2, wherein the charge and discharge master control integrated chip is a BQ40Z50 integrated circuit.
4. The battery protection circuit of claim 2, wherein the indicator light comprises: first pilot lamp, second pilot lamp, third pilot lamp and fourth pilot lamp, first pilot lamp, second pilot lamp, third pilot lamp and fourth pilot lamp respectively through the pilot lamp interface with charge and discharge master control integrated chip's pilot lamp control end is connected.
5. The charge amount display battery protection circuit according to claim 1, further comprising: the current detection circuit comprises a first resistor (RI1) and a second resistor (RI2), one end of the first resistor (RI1) and one end of the second resistor (RI2) are connected with the negative end of the multiple lithium batteries, and the other ends of the first resistor (RI1) and the second resistor (RI2) are connected with a charge and discharge load and are connected with the positive end of the multiple lithium batteries through the charge and discharge load and a charge and discharge control switch circuit.
6. The charge amount display battery protection circuit according to claim 2, further comprising: the temperature detection circuit comprises a thermistor, one end of the thermistor is connected with a first temperature detection end of the charging and discharging main control integrated chip, and the other end of the thermistor is connected with a reference ground.
7. The battery protection circuit with charge amount display according to claim 2, wherein the charge and discharge switch circuit comprises:
a charge switch circuit, the charge switch circuit comprising: the charging control circuit comprises a first MOS transistor (Q18), a second MOS transistor (Q20), a third MOS transistor (Q22) and a fourth MOS transistor (Q24), wherein controlled ends of the first MOS transistor (Q18), the second MOS transistor (Q20), the third MOS transistor (Q22) and the fourth MOS transistor (Q24) are respectively connected with a charging control end of the charging and discharging main control integrated chip; the sources of the first MOS transistor (Q18), the second MOS transistor (Q20), the third MOS transistor (Q22) and the fourth MOS transistor (Q24) are respectively connected with the positive ends of the multiple lithium batteries;
a discharge switch circuit, the discharge switch circuit comprising: a fifth MOS transistor (Q17), a sixth MOS transistor (Q19), a seventh MOS transistor (Q21) and an eighth MOS transistor (Q23), wherein the controlled ends of the fifth MOS transistor (Q17), the sixth MOS transistor (Q19), the seventh MOS transistor (Q21) and the eighth MOS transistor (Q23) are respectively connected with the discharge control end of the charge and discharge main control integrated chip; the sources of the fifth MOS transistor (Q17), the sixth MOS transistor (Q19), the seventh MOS transistor (Q21) and the seventh MOS transistor (Q21) are respectively connected with the drains of the fifth MOS transistor (Q17), the sixth MOS transistor (Q19), the seventh MOS transistor (Q21) and the eighth MOS transistor (Q23), and the drains of the fifth MOS transistor (Q17), the sixth MOS transistor (Q19), the seventh MOS transistor (Q21) and the eighth MOS transistor (Q23) are respectively connected with the negative terminal of the multi-section lithium battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921005319.8U CN209948752U (en) | 2019-06-28 | 2019-06-28 | Battery protection circuit with electric quantity display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921005319.8U CN209948752U (en) | 2019-06-28 | 2019-06-28 | Battery protection circuit with electric quantity display |
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| Publication Number | Publication Date |
|---|---|
| CN209948752U true CN209948752U (en) | 2020-01-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921005319.8U Active CN209948752U (en) | 2019-06-28 | 2019-06-28 | Battery protection circuit with electric quantity display |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209948752U (en) |
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2019
- 2019-06-28 CN CN201921005319.8U patent/CN209948752U/en active Active
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