Battery control circuit, battery pack and electronic equipment

Abstract

The utility model discloses a battery control circuit, battery pack and electronic equipment, the battery control circuit includes control chip, voltage acquisition unit, charge and discharge switch unit and turn-off unit, the input end of voltage acquisition unit is connected with the first end of battery pack, the output end of voltage acquisition unit is connected with the power input pin of control chip, and the charge and discharge switch unit is connected with the control chip. The first end of the battery pack is connected with the first input / output end of the battery control circuit, the first end of the turn-off unit is connected with the power input pin of the control chip, the second end of the turn-off unit is grounded, and the first end of the charge-discharge switch unit is connected with the first end or the second end of the battery pack. The second end of the charging and discharging switch unit serves as the second input / output end of the battery control circuit, the control end of the charging and discharging switch unit is connected with the control pin of the control chip, when the turn-off unit is turned on, the battery pack is turned off, battery output is turned off when the battery is not used, and the battery endurance and safety are improved.

Description

Technical Field

[0001] This utility model relates to battery technology, and more particularly to a battery control circuit, a battery pack, and an electronic device. Background Technology

[0002] With the increasing popularity of portable electrical appliances, batteries are widely used as their energy providers. In order to meet the operating voltage of electrical appliances, it is often necessary to connect multiple individual batteries in series and parallel to form a battery pack.

[0003] There are certain risks involved in transporting and storing batteries while they are charged. If the positive and negative terminals are short-circuited, it can lead to the loss of battery power and even accidents such as fire or explosion. Utility Model Content

[0004] This invention provides a battery control circuit, a battery pack, and an electronic device that can shut off the battery output when the battery is not in use, thereby preventing energy consumption and accidents such as fire and explosion that may occur during battery transportation and storage, and improving battery life and safety.

[0005] In a first aspect, this utility model provides a battery control circuit, including a control chip, a voltage acquisition unit, a charge / discharge switch unit, and a shutdown unit;

[0006] The input terminal of the voltage acquisition unit is connected to the first terminal of the battery pack, the output terminal of the voltage acquisition unit is connected to the power input pin of the control chip, the first terminal of the battery pack is connected to the first input / output terminal of the battery control circuit, and the voltage acquisition unit is used to acquire the voltage of the battery pack.

[0007] The first end of the shutdown unit is connected to the power input pin of the control chip, and the second end of the shutdown unit is grounded.

[0008] The first end of the charge / discharge switch unit is connected to the first or second end of the battery pack, the second end of the charge / discharge switch unit serves as the second input / output end of the battery control circuit, and the control end of the charge / discharge switch unit is connected to the control pin of the control chip.

[0009] When the shutdown unit is turned on, the control chip does not work, the charge / discharge switch unit is turned off, and the battery pack is turned off.

[0010] Optionally, the voltage acquisition unit includes a first resistor and a first capacitor. The first end of the first resistor is connected to the first end of the battery pack, the second end of the first resistor is connected to the first end of the first capacitor and the power input pin of the control chip, and the second end of the first capacitor is grounded.

[0011] Optionally, the charge / discharge switch unit includes a first electronic switch and a second electronic switch, which are connected in reverse series to form a bidirectional switch. The control terminal of the first electronic switch is connected to the first control pin of the control chip, and the control terminal of the second electronic switch is connected to the second control pin of the control chip.

[0012] Optionally, the shutdown unit includes a shutdown switch and a second resistor. The first end of the second resistor is connected to the power input pin of the control chip, and the second end of the second resistor is connected to the first end of the shutdown switch. The second end of the shutdown switch is grounded.

[0013] Optionally, the battery control circuit further includes an activation unit. The first end of the activation unit is connected to the first end of the charge / discharge switch unit, and the second end of the activation unit is connected to the second end of the charge / discharge switch unit and the enable pin of the control chip. When the activation unit is turned on, the control chip is enabled, and the battery pack resumes external output.

[0014] Optionally, the activation unit includes an activation switch, the first end of which is connected to the first end of the charge / discharge switch unit, and the second end of which is connected to the second end of the charge / discharge switch unit and the enable pin of the control chip.

[0015] Optionally, the first terminal of the charge / discharge switch unit is connected to the second terminal of the battery pack, the second terminal of the charge / discharge switch unit is grounded, and the battery control circuit further includes a third resistor, the first terminal of the third resistor is connected to the second terminal of the charge / discharge switch unit and the second terminal of the activation unit respectively, and the second terminal of the third resistor is connected to the enable pin of the control chip.

[0016] Optionally, both the off switch and the activation switch are normally open physical switches.

[0017] Secondly, this utility model also provides a battery pack, including a battery assembly and a battery control circuit as provided in the first aspect of this utility model.

[0018] Thirdly, the present invention also provides an electronic device, including a battery pack as provided in the second aspect of the present invention.

[0019] The battery control circuit provided by this utility model includes a control chip, a voltage acquisition unit, a charge / discharge switch unit, and a shutdown unit. The input terminal of the voltage acquisition unit is connected to the first terminal of the battery pack, and the output terminal of the voltage acquisition unit is connected to the power input pin of the control chip. The first terminal of the battery pack is connected to the first input / output terminal of the battery control circuit. The voltage acquisition unit is used to acquire the voltage of the battery pack. The first terminal of the shutdown unit is connected to the power input pin of the control chip, and the second terminal of the shutdown unit is grounded. The first terminal of the charge / discharge switch unit is connected to either the first or second terminal of the battery pack, and the second terminal of the charge / discharge switch unit serves as the second input / output terminal of the battery control circuit. The control terminal of the charge / discharge switch unit is connected to the control pin of the control chip. When the shutdown unit is on, the control chip does not work, the charge / discharge switch unit is off, and the battery pack is turned off. This circuit can shut off the battery output when the battery is not in use, avoiding potential energy consumption and accidents such as fire or explosion during battery transportation and storage, thus improving battery life and safety. Attached Figure Description

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0021] Figure 1 A schematic diagram of the structure of a battery control circuit provided by this utility model;

[0022] Figure 2 A schematic diagram of another battery control circuit provided by this utility model;

[0023] Figure 3 This is a schematic diagram of the structure of a battery pack provided by this utility model. Detailed Implementation

[0024] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. Additionally, the terms "first" and "second" are used merely for descriptive distinction and have no specific meaning.

[0027] Figure 1 This is a schematic diagram of a battery control circuit provided by the present invention, as shown below. Figure 1 As shown, the battery control circuit 100 includes a control chip 110, a voltage acquisition unit 120, a charge / discharge switch unit 130, and a shutdown unit 140.

[0028] The input terminal of the voltage acquisition unit 120 is connected to the first terminal of the battery pack 200 (this invention uses the first terminal of the battery pack 200 as the positive terminal B+ and the second terminal of the battery pack 200 as the negative terminal B- as an example for illustration). The first terminal of the battery pack 200 is connected to the first input / output terminal P+ of the battery control circuit 100. The output terminal of the voltage acquisition unit 120 is connected to the power input pin VDD of the control chip 110. The voltage acquisition unit 120 is used to acquire the voltage of the battery pack 200. The battery pack 200 includes at least one single cell. When the battery pack 200 includes multiple single cells, the multiple single cells can be connected in series or in parallel. This embodiment of the invention does not limit the specific connection.

[0029] The first terminal of the shutdown unit 140 is connected to the power input pin VDD of the control chip 110, and the second terminal of the shutdown unit 140 is grounded. The shutdown unit 140 can be externally triggered to conduct, thereby pulling down the voltage of the power input pin VDD of the control chip 110, causing the control chip 110 to stop working, the charge / discharge switch unit 130 to open, and the battery pack 200 to be turned off, preventing it from discharging to the outside.

[0030] The first terminal of the charge / discharge switch unit 130 is connected to either the first or second terminal of the battery pack 200 (the figure shows an example of the first terminal of the charge / discharge switch unit 130 being connected to the second terminal of the battery pack 200). The second terminal of the charge / discharge switch unit 130 serves as the second input / output terminal P- of the battery control circuit 100. The control terminal of the charge / discharge switch unit 130 is connected to the control pin of the control chip 110. The control chip 110 controls the charging and discharging process of the battery pack 200 by controlling the switching action of the charge / discharge switch unit 130.

[0031] For example, during the discharge process of battery pack 200, when the voltage acquired by voltage acquisition unit 120 is within the normal range, control chip 110 controls charge / discharge switch unit 130 to operate, the discharge circuit is connected, and battery pack 200 discharges normally; when the acquired voltage is lower than the discharge protection voltage, control chip 110 controls charge / discharge switch unit 130 to operate, and the discharge circuit is disconnected. During the charging process of battery pack 200, when the acquired voltage is higher than the charging protection voltage, control chip 110 controls charge / discharge switch unit 130 to operate, and the charging circuit is disconnected.

[0032] During the energized transportation and storage of the battery pack 200, to prevent short circuits between the positive and negative terminals from causing battery energy consumption, or even accidents such as fire or explosion, the shutdown unit 140 can be externally triggered to turn on. After the shutdown unit 140 is turned on, the voltage of the power input pin VDD of the control chip 110 is pulled low, below the operating voltage of the control chip 110, causing the control chip 110 to fail to operate. Consequently, it cannot send control signals to the charge / discharge switch unit 130, the charge / discharge switch unit 130 is turned off, the battery pack 200 is shut off, and it cannot discharge to the outside.

[0033] The battery control circuit provided by this utility model includes a control chip, a voltage acquisition unit, a charge / discharge switch unit, and a shutdown unit. The input terminal of the voltage acquisition unit is connected to the first terminal of the battery pack, and the output terminal of the voltage acquisition unit is connected to the power input pin of the control chip. The first terminal of the battery pack is connected to the first input / output terminal of the battery control circuit. The voltage acquisition unit is used to acquire the voltage of the battery pack. The first terminal of the shutdown unit is connected to the power input pin of the control chip, and the second terminal of the shutdown unit is grounded. The first terminal of the charge / discharge switch unit is connected to either the first or second terminal of the battery pack, and the second terminal of the charge / discharge switch unit serves as the second input / output terminal of the battery control circuit. The control terminal of the charge / discharge switch unit is connected to the control pin of the control chip. When the shutdown unit is on, the control chip does not work, the charge / discharge switch unit is off, and the battery pack is turned off. This circuit can shut off the battery output when the battery is not in use, avoiding potential energy consumption and accidents such as fire or explosion during battery transportation and storage, thus improving battery life and safety.

[0034] Figure 2 This is a schematic diagram of another battery control circuit provided by the present invention. This embodiment further refines each unit in the present invention based on the aforementioned embodiments, such as... Figure 2 As shown, the voltage acquisition unit 120 includes a first resistor R1 and a first capacitor C1. The first end of the first resistor R1 is connected to the first terminal B+ of the battery pack. The second end of the first resistor R1 is connected to both the first end of the first capacitor C1 and the power input pin VDD of the control chip 110. The second end of the first capacitor C1 is grounded (specifically, the second end of the first capacitor C1 is connected to the second terminal B- of the battery pack) and also connected to the ground pin VSS of the control chip 110. The first resistor R1 limits the current, preventing excessive current input to the power input pin VDD of the control chip 110 from burning out the chip. The first capacitor C1 eliminates transient pulses, thus stabilizing the voltage.

[0035] In some embodiments of this utility model, such as Figure 2 As shown, the charge / discharge switch unit 130 includes a first electronic switch Q1 and a second electronic switch Q2. The first electronic switch Q1 and the second electronic switch Q2 are connected in reverse series to form a bidirectional switch. The control terminal of the first electronic switch Q1 is connected to the first control pin DO of the control chip 110, and the control terminal of the second electronic switch Q2 is connected to the second control pin CO of the control chip 110.

[0036] For example, during battery pack discharge, when the voltage acquired by the voltage acquisition unit 120 is within the normal range, the control chip 110 controls the first electronic switch Q1 and the second electronic switch Q2 to turn on, the discharge circuit is connected, and the battery pack 200 discharges normally. When the acquired voltage is lower than the discharge protection voltage, the control chip 110 controls the first electronic switch Q1 to turn off, and the discharge circuit is disconnected. During battery pack charging, when the acquired voltage is higher than the charging protection voltage, the control chip 110 controls the second electronic switch Q2 to turn off, and the charging circuit is disconnected.

[0037] When the shutdown unit 140 is externally triggered and turned on, the voltage of the power input pin VDD of the control chip 110 is pulled down, which is lower than the operating voltage of the control chip 110, so that the control chip 110 cannot work and thus cannot send control signals to the charge / discharge switch unit 130. The first electronic switch Q1 and the second electronic switch Q2 are both turned off, and the battery pack can neither discharge nor charge.

[0038] In some embodiments of this utility model, such as Figure 2 As shown, the shutdown unit 140 includes a shutdown switch K1 and a second resistor R2. The first end of the second resistor R2 is connected to the power input pin VDD of the control chip 110, and the second end of the second resistor R2 is connected to the first end of the shutdown switch K1. The second end of the shutdown switch K1 is grounded. In some embodiments of this invention, the shutdown switch K1 is a normally open physical switch. After being triggered to close, the shutdown switch K1 automatically opens. For example, after the shutdown switch K1 is externally triggered to close, the voltage of the power input pin VDD of the control chip 110 is pulled down to 0V. The control chip 110 cannot work and cannot send control signals to the first electronic switch Q1 and the second electronic switch Q2. Therefore, both the first electronic switch Q1 and the second electronic switch Q2 are turned off, and the battery pack cannot discharge or charge.

[0039] In some embodiments of this utility model, such as Figure 2 As shown, the battery control circuit also includes an activation unit 140. The first terminal of the activation unit 150 is connected to the first terminal of the charge / discharge switch unit 130, and the second terminal of the activation unit 150 is connected to the second terminal of the charge / discharge switch unit 130 and the enable pin CS of the control chip 110. When the activation unit 150 is turned on, the control chip 110 is enabled, and the battery pack resumes external output.

[0040] For example, such as Figure 2As shown, the activation unit 150 includes an activation switch K2. The first terminal of activation switch K2 is connected to the first terminal of charge / discharge switch unit 130, and the second terminal of activation switch K2 is connected to both the second terminal of charge / discharge switch unit 130 and the enable pin CS of control chip 110. The first terminal of charge / discharge switch unit 130 is connected to the second terminal B- of the battery pack, and the second terminal of charge / discharge switch unit 130 is grounded. The battery control circuit also includes a third resistor R3. The first terminal of the third resistor R3 is connected to both the second terminal of charge / discharge switch unit 130 and the second terminal of activation unit 150, and the second terminal of the third resistor R3 is connected to the enable pin CS of control chip 110. In some embodiments of this invention, activation switch K2 is a normally open physical switch, which automatically opens after being triggered to close.

[0041] For example, in the aforementioned process, after the shutdown unit 140 is triggered and turned on, both the first electronic switch Q1 and the second electronic switch Q2 are turned off, and the battery pack can neither discharge nor charge. If no abnormality is found after inspection, and it is necessary to discharge the battery pack again, the activation unit 150 (activation switch K2) can be externally triggered to turn on the activation unit 150 (activation switch K2 is closed). The voltage of the enable pin CS of the control chip 110 is pulled down to 0V, enabling the control chip 110. The control chip 110 resumes operation, controls the first electronic switch Q1 and the second electronic switch Q2 to turn on, and the battery pack resumes external output.

[0042] This utility model also provides a battery pack. Figure 3 This is a schematic diagram of the structure of a battery pack provided by this utility model, as shown below. Figure 3 As shown, the battery pack includes a housing 310, a battery pack, and a battery control circuit as provided in any of the foregoing embodiments of this utility model. The battery pack and the battery control circuit are disposed inside the housing 310. The structure of the battery control circuit and the connection relationship between the battery control circuit and the battery pack have been described in detail in the foregoing embodiments, and will not be repeated here. For example, as shown... Figure 2 As shown, in a specific embodiment of this utility model, the battery control circuit includes a shutdown switch K1 and an activation switch K2. The shutdown switch K1 and the activation switch K2 are disposed on the side wall of the housing 310, and the user can manually trigger the shutdown switch K1 and the activation switch K2.

[0043] The present invention also provides an electronic device comprising a battery pack as described in the foregoing embodiments of the present invention.

[0044] In the description herein, it should be understood that the terms "upper," "lower," "left," "right," etc., are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0045] In the description of this specification, references to terms such as "an embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0046] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0047] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without any inventive effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. A battery control circuit, characterized in that, It includes a control chip, a voltage acquisition unit, a charge / discharge switch unit, and a shutdown unit; The input terminal of the voltage acquisition unit is connected to the first terminal of the battery pack, the output terminal of the voltage acquisition unit is connected to the power input pin of the control chip, the first terminal of the battery pack is connected to the first input / output terminal of the battery control circuit, and the voltage acquisition unit is used to acquire the voltage of the battery pack. The first end of the shutdown unit is connected to the power input pin of the control chip, and the second end of the shutdown unit is grounded. The first end of the charge / discharge switch unit is connected to the first or second end of the battery pack, the second end of the charge / discharge switch unit serves as the second input / output end of the battery control circuit, and the control end of the charge / discharge switch unit is connected to the control pin of the control chip. When the shutdown unit is turned on, the control chip does not work, the charge / discharge switch unit is turned off, and the battery pack is turned off.

2. The battery control circuit according to claim 1, characterized in that, The voltage acquisition unit includes a first resistor and a first capacitor. The first end of the first resistor is connected to the first end of the battery pack. The second end of the first resistor is connected to the first end of the first capacitor and the power input pin of the control chip. The second end of the first capacitor is grounded.

3. The battery control circuit according to claim 1, characterized in that, The charge / discharge switch unit includes a first electronic switch and a second electronic switch. The first electronic switch and the second electronic switch are connected in reverse series to form a bidirectional switch. The control terminal of the first electronic switch is connected to the first control pin of the control chip, and the control terminal of the second electronic switch is connected to the second control pin of the control chip.

4. The battery control circuit according to any one of claims 1-3, characterized in that, The shutdown unit includes a shutdown switch and a second resistor. The first end of the second resistor is connected to the power input pin of the control chip, and the second end of the second resistor is connected to the first end of the shutdown switch. The second end of the shutdown switch is grounded.

5. The battery control circuit according to claim 4, characterized in that, It also includes an activation unit, the first end of which is connected to the first end of the charge / discharge switch unit, and the second end of which is connected to the second end of the charge / discharge switch unit and the enable pin of the control chip. When the activation unit is turned on, the control chip is enabled and the battery pack resumes external output.

6. The battery control circuit according to claim 5, characterized in that, The activation unit includes an activation switch. The first end of the activation switch is connected to the first end of the charge / discharge switch unit, and the second end of the activation switch is connected to the second end of the charge / discharge switch unit and the enable pin of the control chip, respectively.

7. The battery control circuit according to claim 6, characterized in that, The first terminal of the charge / discharge switch unit is connected to the second terminal of the battery pack, and the second terminal of the charge / discharge switch unit is grounded. The battery control circuit also includes a third resistor, the first terminal of which is connected to the second terminal of the charge / discharge switch unit and the second terminal of the activation unit, respectively, and the second terminal of the third resistor is connected to the enable pin of the control chip.

8. The battery control circuit according to claim 7, characterized in that, Both the off switch and the activation switch are normally open physical switches.

9. A battery pack, characterized in that, It includes a battery pack and a battery control circuit as described in any one of claims 1-8.

10. An electronic device, characterized in that, Includes the battery pack as described in claim 9.

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