CN213461181U

CN213461181U - Lithium battery charging circuit and lithium battery charging device

Info

Publication number: CN213461181U
Application number: CN202022320915.4U
Authority: CN
Inventors: 邓涛; 邓江华
Original assignee: Shenzhen Damoda Intelligent Control Technology Co ltd
Current assignee: Shenzhen Damoda Intelligent Control Technology Co ltd
Priority date: 2020-10-16
Filing date: 2020-10-16
Publication date: 2021-06-15
Anticipated expiration: 2030-10-16

Abstract

The utility model discloses a lithium battery charging circuit and lithium battery charging device, charging circuit includes: the lithium battery charging and discharging device comprises a central control unit and a charging and discharging unit electrically connected with the central control unit, wherein the output end of the charging and discharging unit is electrically connected with a lithium battery and used for adjusting the charging current of the lithium battery, the charging and discharging unit comprises a charging and discharging control chip, and a temperature detection subunit and a charging subunit which are electrically connected with the charging and discharging control chip, the temperature detection subunit is used for detecting the charging temperature of the lithium battery, and the charging subunit is used for controlling the charging current of the lithium battery. The charging temperature of the lithium battery is detected through the temperature detection subunit, the charging current of the lithium battery is controlled through the charging subunit according to the real-time charging temperature of the lithium battery, the charging process of the lithium battery is safer and more reliable, and the service life of the lithium battery is further prolonged.

Description

Lithium battery charging circuit and lithium battery charging device

Technical Field

The utility model relates to a lithium cell field, the more specifically lithium battery charging circuit and lithium battery charging device that says so.

Background

With the continuous development and innovation of unmanned aerial vehicle technology, unmanned aerial vehicles are used in more and more fields. The unmanned cluster light performance is more and more pursued as a novel deductive way and a media means. In order to present perfect artistic effect, unmanned aerial vehicles in single cluster performance are more and more erected, and thousands of times of single performance in the future become normal.

Because the number of the stands of a single performance is increased, a large number of lithium batteries are required to be charged in each performance; this brings a great deal of work to the logistical charging personnel. The existing charger in the market can only charge a single lithium battery generally, although a charging expansion board can charge a plurality of lithium batteries, the use of the charging board can not provide protection functions of balanced charging, over-temperature and the like for each lithium battery, and the charging method can cause long-term damage to the lithium batteries and shorten the service lives of the lithium batteries.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art not enough, provide a lithium battery charging circuit and lithium battery charging device.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a lithium battery charging circuit, including well accuse unit, and the electricity connect in the charge and discharge unit of well accuse unit, the lithium cell is connected to the output electricity of charge and discharge unit to the charging current of adjustment lithium cell, charge and discharge unit is including filling control chip, and the electricity is connected charge and discharge control chip's temperature detection subunit and charging subunit, the temperature detection subunit is used for detecting the charging temperature of lithium cell, charging subunit is used for controlling lithium cell charging current size.

Further, the central control unit comprises a control chip, and the control chip is electrically connected with the charge-discharge control chip.

Further, the model of the control chip is STM32F103CBT 6.

And the state prompting unit is electrically connected with the central control unit and is used for sending a prompting signal to prompt the charging state of the lithium battery.

Furthermore, the state prompting unit comprises a prompting lamp set, and the prompting lamp set is electrically connected with the control chip.

Furthermore, the state prompting unit comprises a prompting loudspeaker, and the prompting loudspeaker is electrically connected with the control chip.

Furthermore, the temperature detection subunit includes a second resistor, a thermistor, a third resistor and a second capacitor, the first ends of the second resistor and the second capacitor are connected to the TS terminal pin of the charge and discharge control chip U2, the second end of the second capacitor is grounded, the second end of the second resistor is connected to the first ends of the thermistor and the third resistor, the second ends of the thermistor and the third resistor are grounded, and the thermistor is tightly attached to the lithium battery.

Further, the charging subunit includes charging circuit, first MOS pipe and second MOS pipe, the input termination power input of charging circuit, the output termination lithium cell of charging circuit, the SPR terminal pin of control chip U2 is filled in connecing to the source electrode of first MOS pipe, the grid of first MOS pipe connects fills the GND terminal pin of control chip U2, the drain electrode of first MOS pipe connects the source electrode of second MOS pipe and fills the PH terminal pin of control chip U2, the grid of second MOS pipe connects the HIDRV terminal pin of control chip U2, the drain electrode of second MOS pipe connects the charging circuit to the charging current of control charging circuit.

Further, the charge and discharge unit further comprises a voltage detection subunit, the voltage detection subunit comprises a third MOS transistor, a first resistor and a first capacitor, a source electrode of the third MOS transistor is connected with a VFB terminal pin of the charge and discharge control chip U2, a gate electrode of the third MOS transistor is connected with a first end of the first resistor and the first capacitor, and a battrv terminal pin of the charge and discharge control chip U2, and a drain electrode of the third MOS transistor is connected with the charge circuit and detects the battery voltage of the charge circuit.

The utility model also provides a lithium battery charging device, include as above arbitrary the lithium battery charging circuit to and the charging box, the surface of charging box is provided with a plurality of charging slot, lithium battery charging circuit set up in inside the charging box, and the electricity is connected charging slot is the lithium cell charge in the charging slot.

Compared with the prior art, the utility model beneficial effect be: the utility model provides a pair of lithium battery charging circuit detects the charging temperature of lithium cell through the temperature detection subunit to according to the real-time charging temperature of lithium cell, through the charging subunit control lithium cell charging current size, lithium battery charging process safe and reliable more, and then improved the life of lithium cell.

The foregoing is a summary of the present invention, and other objects, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments, which is provided for the purpose of illustration and understanding of the present invention.

Drawings

Fig. 1 is a schematic block diagram of a specific embodiment of a lithium battery charging circuit according to the present invention;

fig. 2 is a circuit diagram of a central control unit according to an embodiment of the lithium battery charging circuit of the present invention;

fig. 3 is a circuit diagram of a charging/discharging unit according to a specific embodiment of the lithium battery charging circuit of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and the following detailed description.

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "secured" are to be construed broadly and can, for example, be connected or detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

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 should not be understood to 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. Furthermore, various embodiments or examples described in this specification can be combined and combined by one skilled in the art.

Referring to fig. 1-3, the utility model provides a lithium battery charging circuit, including well accuse unit 10 to and the electricity is connected in the charge and discharge unit 20 of well accuse unit 10, lithium cell 40 is connected to the output electricity of charge and discharge unit 20, and be used for adjusting lithium cell 40's charging current, charge and discharge unit 20 includes the charge and discharge control chip, and the temperature that the electricity is connected the charge and discharge control chip detects subunit 21 and charging subunit 22, and temperature detects subunit 21 is used for detecting the charging temperature of lithium cell 40, and charging subunit 22 is used for controlling lithium cell 40 charging current size.

The central control unit 10 includes a control chip electrically connected to the charge and discharge control chip. Referring to fig. 2, the model of the control chip is STM32F103CBT 6.

The lithium battery charging circuit of this scheme still includes state suggestion unit 30, and state suggestion unit 30 is connected with well accuse unit 10 electricity for sound or light prompt signal suggestion lithium battery 40's the state of charge, the user of being convenient for in time knows lithium battery 40's the state of charge, in time takes out the lithium battery 40 that is full of or the trouble, and is concrete, and the state of charge includes: a discharged state, a charged state, a fault state, and a fully charged state. In an embodiment, the status prompt unit 30 includes a prompt lamp set electrically connected to the control chip, and emits different lights under the control of the control chip to prompt the charging status of the corresponding lithium battery 40. In another embodiment, the status prompt unit 30 includes a prompt speaker electrically connected to the control chip for giving different sounds to prompt the charging status of the corresponding lithium battery 40.

Referring to fig. 3, the temperature detecting subunit 21 includes a second resistor R3, a thermistor R5, a third resistor R31, and a second capacitor C5, first ends of the second resistor R3 and the second capacitor C5 are connected to a TS terminal pin of the charge and discharge control chip U2, a second end of the second capacitor C5 is grounded, a second end of the second resistor R3 is connected to first ends of the thermistor R5 and the third resistor R31, second ends of the thermistor R5 and the third resistor R31 are grounded, and the thermistor R5 is disposed in close proximity to the lithium battery 40, the thermistor R5 feeds back an electric signal to the charge and discharge control chip U2 according to a temperature of the lithium battery 40 and transmits the electric signal to the central control unit 10 through the charge and discharge control chip U2, the central control unit 10 obtains a real-time charging temperature of the lithium battery 40 according to the electric signal, and further adjusts on and off of the heat dissipating assembly according to the real-time charging temperature, or controls a magnitude of the charging current.

Specifically, the charging temperature of the lithium battery 40 is obtained according to the electric signal fed back by the thermistor, the magnitude of the charging current corresponding to the lithium battery 40 is determined according to the charging temperature, and if the charging temperature is too high or too low, the charging of the lithium battery 40 is terminated. In the present embodiment, when the charging temperature is 0 degrees or less or 45 degrees or more, the charging of the battery is stopped; when the charging temperature is more than 0 ℃ and less than 10 ℃ or more than 40 ℃ or less than 45 ℃, the charging current is charged according to 0.5 time of the normal current; when the temperature is higher than 10 ℃ and lower than 40 ℃, charging according to the normal current. Different charging strategies are adopted according to the charging temperature of the lithium battery 40, so that the lithium battery 40 is fully protected, and meanwhile, fire disasters can be avoided during charging.

Referring to fig. 1 and 3, the charging subunit 22 includes a charging circuit, the input ends of the charging circuits of the first MOS tube U3 and the second MOS tube U1 are connected to the power input, the output end of the charging circuit is connected to the lithium battery 40, the source of the first MOS tube U3 is connected to the SPR terminal pin of the charging and discharging control chip U2, the gate of the first MOS tube U3 is connected to the GND terminal pin of the charging and discharging control chip U2, the drain of the first MOS tube U3 is connected to the source of the second MOS tube U1 and the PH terminal pin of the charging and discharging control chip U2, the gate of the second MOS tube U1 is connected to the drhiv terminal pin of the charging and discharging control chip U2, and the drain of the second MOS tube U1 is connected to the charging circuit, and controls the charging current of the charging. The charging unit 22 controls the charging current of the corresponding lithium battery 40 by controlling the on-off of the first MOS transistor U3 and the second MOS transistor U1, thereby ensuring the stability and reliability of the charging process of the lithium battery 40.

Referring to fig. 1 and 3, the charge and discharge unit 20 further includes a voltage detection subunit 23, the voltage detection subunit 23 includes a third MOS transistor, a first resistor R33 and a first capacitor C46, a source of the third MOS transistor U13 is connected to a VFB terminal pin of the charge and discharge control chip U2, a gate of the third MOS transistor U13 is connected to a first end of the first resistor R33 and a first end of the first capacitor C46, and a battrv terminal pin of the charge and discharge control chip U2, a drain of the third MOS transistor U13 is connected to a charging circuit, and the charge and discharge control chip U2 detects a voltage of the charging circuit through the VFB terminal pin, that is, a battery voltage of the charged lithium battery 40.

Specifically, if it is detected that the battery voltage of the lithium battery 40 is less than (N × 3.6V, N is the number of battery cells), the lithium battery 40 may be charged with a small current until the battery voltage is greater than N × 3.6V; when the battery voltage is greater than N × 3.6V, the lithium battery 40 is charged with a large current until the battery voltage is greater than N × 4.15V; the charging current is then reduced step by step until the lithium battery 40 is full of N x 4.2V, and the charging is complete. Different currents are adopted in different stages, so that the battery is better protected.

The utility model provides a pair of lithium battery charging circuit detects lithium cell 40's charging temperature through temperature detection subunit 21 to according to lithium cell 40's real-time charging temperature, through the charging subunit 22 control lithium cell 40 charging current size, lithium cell 40 charging process is safe and reliable more, and then has improved lithium cell 40's life.

The utility model also provides a lithium battery charging device, including as above embodiment lithium battery charging circuit to and the charging box body, the surface of charging box body is provided with a plurality of charging slot, lithium battery charging circuit sets up inside the charging box body, and the lithium cell that the charging slot is connected for charging in the slot of electricity charges.

The technical content of the present invention is further described by the embodiments only, so that the reader can understand it more easily, but the embodiments of the present invention are not limited thereto, and any technical extension or re-creation according to the present invention is protected by the present invention. The protection scope of the present invention is subject to the claims.

Claims

1. The lithium battery charging circuit is characterized by comprising a central control unit and a charging and discharging unit electrically connected with the central control unit, wherein the output end of the charging and discharging unit is electrically connected with a lithium battery and used for adjusting the charging current of the lithium battery, the charging and discharging unit comprises a charging and discharging control chip, and a temperature detection subunit and a charging subunit which are electrically connected with the charging and discharging control chip, the temperature detection subunit is used for detecting the charging temperature of the lithium battery, and the charging subunit is used for controlling the charging current of the lithium battery.

2. The lithium battery charging circuit of claim 1, wherein the central control unit comprises a control chip, and the control chip is electrically connected with the charge and discharge control chip.

3. The lithium battery charging circuit of claim 2, wherein the control chip is model number STM32F103CBT 6.

4. The lithium battery charging circuit of claim 3, further comprising a status prompting unit electrically connected to the central control unit for sending a prompting signal to prompt the charging status of the lithium battery.

5. The lithium battery charging circuit of claim 4, wherein the status prompting unit comprises a prompting light set, and the prompting light set is electrically connected with the control chip.

6. The lithium battery charging circuit of claim 5, wherein the status prompting unit comprises a prompting speaker, and the prompting speaker is electrically connected to the control chip.

7. The lithium battery charging circuit of claim 1, wherein the temperature detection subunit comprises a second resistor, a thermistor, a third resistor and a second capacitor, a first end of the second resistor and a first end of the second capacitor are connected to a TS terminal pin of the charge and discharge control chip U2, a second end of the second capacitor is grounded, a second end of the second resistor is connected to a first end of the thermistor and a first end of the third resistor, a second end of the thermistor and a second end of the third resistor are grounded, and the thermistor is disposed in close proximity to the lithium battery.

8. The lithium battery charging circuit according to claim 7, wherein the charging subunit comprises a charging circuit, a first MOS transistor and a second MOS transistor, an input end of the charging circuit is connected to a power input, an output end of the charging circuit is connected to the lithium battery, a source electrode of the first MOS transistor is connected to an SPR terminal pin of the charging and discharging control chip U2, a gate electrode of the first MOS transistor is connected to a GND terminal pin of the charging and discharging control chip U2, a drain electrode of the first MOS transistor is connected to a source electrode of the second MOS transistor and a PH terminal pin of the charging and discharging control chip U2, a gate electrode of the second MOS transistor is connected to a HIDRV terminal pin of the charging and discharging control chip U2, and a drain electrode of the second MOS transistor is connected to the charging circuit and controls a charging current of the charging circuit.

9. The lithium battery charging circuit according to claim 8, wherein the charging and discharging unit further comprises a voltage detection subunit, the voltage detection subunit comprises a third MOS transistor, a first resistor and a first capacitor, a source of the third MOS transistor is connected to the VFB terminal pin of the charging and discharging control chip U2, a gate of the third MOS transistor is connected to the first terminals of the first resistor and the first capacitor, and a battrv terminal pin of the charging and discharging control chip U2, and a drain of the third MOS transistor is connected to the charging line and detects the battery voltage of the charging line.

10. A lithium battery charging device, comprising the lithium battery charging circuit as claimed in any one of claims 1 to 9, and a charging box, wherein the outer surface of the charging box is provided with a plurality of charging slots, the lithium battery charging circuit is disposed inside the charging box, and the charging slots are electrically connected to charge the lithium batteries in the charging slots.