Activation circuit, battery protection module, battery module and electronic equipment

Abstract

The utility model discloses an activation circuit, a battery protection module, a battery module and electronic equipment. The activation circuit comprises a first switching circuit, a resistance network and a capacitance circuit, the first end of the resistance network is connected with the battery pack, and the second end of the resistance network is connected with the first end of the capacitance circuit; the first end of the first switching circuit is connected with the third end of the resistance network, the second end of the first switching circuit is connected with the fourth end of the resistance network, the third end of the first switching circuit is used for connecting a battery management module, and the second end of the capacitance circuit is used for connecting a grounding resistor in the electronic equipment; when the second end of the capacitive circuit is connected to the electronic equipment, the first switching circuit is switched on, and the third end of the first switching circuit outputs an electric signal to activate the battery management module. According to the technical scheme, the battery management module is automatically activated when the capacitor circuit is connected to the electronic equipment, the battery pack, the resistance network and the grounding resistor are isolated through the capacitor circuit, discharging of the battery pack through the resistance network is avoided, and battery pack loss is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technical field especially relates to a kind of activation circuit, battery protection module, battery module and electronic equipment. BACKGROUND

[0002] With the rapid development of lithium battery industry, the application field of lithium battery is more and more, but because of its high voltage, energy density characteristics, such as, it needs protection scheme to ensure the safety of lithium battery. Common protection functions include overcharge voltage protection, over-discharge voltage protection, overcurrent protection and short circuit protection, etc., to ensure the normal work of battery pack. The self-consumption of lithium battery protection board will increase, and then the storage time of lithium battery will be greatly shortened, which cannot meet the customer demand.

[0003] Therefore, in order to meet the long-term storage demand of lithium battery, the existing solution is generally to automatically power off and hibernate by microcontroller unit (MCU) on the battery protection board when the preset delay time is reached, but if the lithium battery after hibernation wants to be used again, it must be activated. At present, the commonly used lithium battery activation method needs manual activation, such as activation by using charger, so that the lithium battery product needs to find charger power when it reaches the user's hand, and the user experience is poor. UTILITY MODEL CONTENT

[0004] The utility model embodiment provides a kind of activation circuit, battery protection module, battery module and electronic equipment to solve the problem that existing lithium battery product cannot be activated automatically.

[0005] An activation circuit includes a first switching circuit, a resistance network and a capacitor circuit.

[0006] The first end of the resistance network is used to connect battery pack, and the second end of the resistance network is connected with the first end of the capacitor circuit. The first end of the first switching circuit is connected with the third end of the resistance network, the second end of the first switching circuit is connected with the fourth end of the resistance network, the third end of the first switching circuit is used to connect battery management module, and the second end of the capacitor circuit is used to connect ground resistance in electronic equipment. Wherein, when the ground resistance of the electronic equipment is connected to the second end of the capacitor circuit, the first switching circuit is turned on to output electric signal through the third end of the first switching circuit to activate the battery management module.

[0007] Further, the first switching circuit includes a switch tube.

[0008] Further, the switch tube is a PMOS tube; a gate of the PMOS tube is connected with a third end of the resistance network, a source of the PMOS tube is connected with a fourth end of the resistance network, and a drain of the PMOS tube is used for connecting a battery management module.

[0009] Further, the resistance network comprises a first resistance circuit, a second resistance circuit and a third resistance circuit.

[0010] The first resistance circuit, the second resistance circuit and the third resistance circuit are sequentially and serially arranged between the battery pack and a first end of the capacitor circuit.

[0011] A connection node between the first resistance circuit and the second resistance circuit is connected with a first end of the first switch circuit, and a connection node between the second resistance circuit and the third resistance circuit is connected with a second end of the first switch circuit.

[0012] Further, a voltage of the electric signal is greater than 2.5V.

[0013] A battery protection module comprises a battery management module and the above-mentioned activation circuit; the battery management module is connected with a third end of the first switch circuit.

[0014] Further, the battery management module comprises a battery management chip; an activation signal pin of the battery management chip is connected with the third end of the first switch circuit.

[0015] A battery module comprises a battery pack and the above-mentioned battery protection module.

[0016] The battery pack is connected with a first end of the resistance network.

[0017] An electronic device comprises a grounding resistance; a first end of the grounding resistance is used for connecting the above-mentioned battery module, and a second end of the grounding resistance is grounded.

[0018] The activation circuit, the battery protection module, the battery module and the electronic device, the activation circuit comprises a first switch circuit, a resistance network and a capacitor circuit; a first end of the resistance network is used for connecting a battery, a second end of the resistance network is connected with a first end of the capacitor circuit; a first end of the first switch circuit is connected with a third end of the resistance network, a second end of the first switch circuit is connected with a fourth end of the resistance network, and a third end of the first switch circuit is used for connecting a battery management module; and a second end of the capacitor circuit is used for connecting a grounding resistor in the electronic device. When the grounding resistor of the electronic device is connected to the second end of the capacitor circuit, the first switch circuit is turned on to output an electric signal through the third end of the first switch circuit to activate the battery management module, and when the grounding resistor of the electronic device is connected to the second end of the capacitor circuit, the battery management module is automatically activated, and after the battery management module is activated, the capacitor circuit is used for isolating the battery pack, the resistance network and the grounding resistor, so that the battery pack is prevented from discharging through the resistance network all the time, and the loss of the battery pack is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0020] Figure 1 is a circuit schematic diagram of the activation circuit in an embodiment of the present application;

[0021] Figure 2 is a schematic diagram of the battery module in an embodiment of the present application.

[0022] In the figure: 1, battery protection module; 11, battery management module; 12, activation circuit; 121, first switch circuit; 122, resistance network; 1221, first resistance circuit; 1222, second resistance circuit; 1223, third resistance circuit; 123, capacitor circuit; 2, battery pack; 3, electronic device. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0024] It is to be understood that the present application can be carried out by different embodiments and that the embodiments presented are only examples. To this end, the present application is not considered to be limited to the examples presented but rather that these examples serve the purpose of disclosing the present application most thoroughly and completely and to convey the full scope of the present application to those skilled in the art. In the drawings, the size of layers and regions as well as the relative sizes of regions can be exaggerated for clarity. Like numbers refer to like elements throughout.

[0025] It will be understood that when an element or layer is referred to as being "on" or "connected to" another element or layer, it can be directly on or connected to the other element or layer or intervening elements or layers can be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element or layer, there are no intervening elements or layers present. It will also be understood that, although the terms first, second, third, etc. can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present application.

[0026] Spatially relative terms, such as "beneath", "below", "lower", "under", "above", "upper" and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if a device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0027] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising", when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0028] In order to fully understand the present invention, the following description will provide detailed structures and steps to illustrate the technical solutions proposed by the present invention. The preferred embodiments of the present invention are described in detail below. However, in addition to these detailed descriptions, the present invention may also have other implementation methods.

[0029] This embodiment provides an activation circuit 12, such as Figure 1 As shown, the device includes a first switch circuit 121, a resistor network 122, and a capacitor circuit 123. The first terminal (B+) of the resistor network 122 is connected to the battery, and the second terminal of the resistor network 122 is connected to the first terminal of the capacitor circuit 123. The first terminal of the first switch circuit 121 is connected to the third terminal of the resistor network 122, and the second terminal of the first switch circuit 121 is connected to the fourth terminal of the resistor network 122. The third terminal (PACK) of the first switch circuit 121 is connected to the battery management module 11. The second terminal of the capacitor circuit 123 is connected to the ground resistor R4 in the electronic device 3. When the second terminal of the capacitor circuit 123 is connected to the ground resistor R4 of the electronic device 3, the first switch circuit 121 is turned on, and an electrical signal is output through the third terminal of the first switch circuit 121 to activate the battery management module 11.

[0030] Among them, the battery pack 2 includes a single cell or multiple cells. The cell is a lithium-ion cell. Exemplarily, the operating voltage of the single cell is 2.5-4.2V. The battery management module 11 includes a cell management chip. Exemplarily, the battery management chip includes an activation signal input pin. When the battery management chip enters sleep mode and is powered off and needs to be reactivated, it receives an electrical signal through the activation signal input pin, thereby activating the battery management chip through the electrical signal. The capacitor circuit 123 includes at least one capacitor. For example, the capacitor circuit 123 includes a capacitor C1. It can be understood that the electrical parameters of the capacitor can be set according to actual experience and are not limited here.

[0031] As an example, the first end of the resistance network 122 is used to connect the battery pack 2, the second end of the resistance network 122 is connected with the first end of the capacitor circuit 123, and the second end of the capacitor circuit 123 is used to connect the ground resistance R4 in the electronic device 3. Exemplarily, the second end of the capacitor circuit 123 is connected with the ground resistance R4 through the interface J1 and the interface J2. The first end of the first switch circuit 121 is connected with the third end of the resistance network 122, the second end of the first switch circuit 121 is connected with the fourth end of the resistance network 122, and the third end of the first switch circuit 121 is used to connect the activation signal input pin of the battery management chip of the battery management module 11. In the example, the activation circuit 12 is applied in the battery module, and the battery module includes the battery pack 2 and the battery protection module 1 used to protect the battery pack 2 to ensure the safety of the battery module. When the battery module is in the dormant state during the long-time storage and transportation, when it is used to assemble on the electronic device 3, the second end of the capacitor circuit 123 is connected to the ground resistance R4 in the electronic device 3, the resistance network 122 forms a ground loop with the battery pack 2 and the ground resistance R4, and through the voltage division of the resistance network 122, the first end of the first switch circuit 121 and the second end of the first switch circuit 121 generate a voltage difference, thereby controlling the first switch circuit 121 to be turned on, and the third end of the first switch circuit 121 outputs an electrical signal to the battery management module 11, thereby activating the battery management module 11. When the battery management module 11 is activated, due to the direct current isolation effect of the capacitor circuit 123, the resistance network 122 cannot continue to form a ground loop with the battery pack 2 and the ground resistance R4, thereby avoiding the battery pack 2 discharging through the resistance network 122 all the time and reducing the loss of the battery pack 2.

[0032] In the embodiment, the activation circuit 12 includes the first switch circuit 121, the resistance network 122 and the capacitor circuit 123; the first end of the resistance network 122 is used to connect the battery, the second end of the resistance network 122 is connected with the first end of the capacitor circuit 123; the first end of the first switch circuit 121 is connected with the third end of the resistance network 122, the second end of the first switch circuit 121 is connected with the fourth end of the resistance network 122, and the third end of the first switch circuit 121 is used to connect the battery management module 11; and the second end of the capacitor circuit 123 is used to connect the ground resistance R4 in the electronic device 3. When the second end of the capacitor circuit 123 is connected to the ground resistance R4 in the electronic device 3, the first switch circuit 121 is turned on to output an electrical signal through the third end of the first switch circuit 121 to activate the battery management module 11, thereby automatically activating the battery management module 11 when the second end of the capacitor circuit 123 is connected to the ground resistance R4 in the electronic device 3, and after the battery management module 11 is activated, the battery pack 2, the resistance network 122 and the ground resistance R4 are isolated through the capacitor circuit 123, thereby avoiding the battery pack 2 discharging through the resistance network 122 all the time and reducing the loss of the battery pack 2.

[0033] In an embodiment, the first switch circuit 121 comprises a switch tube Q1.

[0034] As an example, the switch tube Q1 can be a field effect transistor or a bipolar transistor. By connecting the gate or base of the switch tube Q1 to the third terminal of the resistance network 122 and connecting the source or collector of the switch tube Q1 to the fourth terminal of the resistance network 122, the switch tube Q1 can be controlled to be turned on when a voltage difference is generated between the third terminal and the fourth terminal of the resistance network 122, and an electrical signal is output to the battery management module 11 through the drain or emitter of the switch tube Q1 to activate the battery management module 11. In this embodiment, the battery management module 11 is activated by the switch tube Q1, which can improve the response speed of activation.

[0035] In an embodiment, the switch tube Q1 is a PMOS tube; the gate of the PMOS tube is connected to the third terminal of the resistance network 122, the source of the PMOS tube is connected to the fourth terminal of the resistance network 122, and the drain of the PMOS tube is used to connect the battery management module 11.

[0036] In this embodiment, the switch tube Q1 is a PMOS tube, the gate of the PMOS tube is connected to the third terminal of the resistance network 122, the source of the PMOS tube is connected to the fourth terminal of the resistance network 122, and the drain of the PMOS tube is used to connect the battery management module 11, so that the switch tube Q1 can be controlled to be turned on by a lower voltage. At the same time, the leakage current (I_DSS) of the PMOS tube is usually low in the off state, which reduces the power loss of the battery.

[0037] In an embodiment, the resistance network 122 comprises a first resistance circuit 1221, a second resistance circuit 1222 and a third resistance circuit 1223; the first resistance circuit 1221, the second resistance circuit 1222 and the third resistance circuit 1223 are sequentially connected in series between the battery pack 2 and the first terminal of the capacitor circuit 123; the connection node between the first resistance circuit 1221 and the second resistance circuit 1222 is connected to the first terminal of the first switch circuit 121, and the connection node between the second resistance circuit 1222 and the third resistance circuit 1223 is connected to the second terminal of the first switch circuit 121.

[0038] The first resistance circuit 1221, the second resistance circuit 1222 and the third resistance circuit 1223 each include at least one resistor. For example, the first resistance circuit 1221 includes a resistor R1, the second resistance circuit 1222 includes a resistor R2, and the third resistance circuit 1223 includes a resistor R3. The resistance values of the first resistance circuit 1221, the second resistance circuit 1222 and the third resistance circuit 1223 are set according to actual experience, to ensure that the first switch circuit 121 is turned on, and after the first switch circuit 121 is turned on, the voltage of the voltage division of the first resistance circuit 1221 and the first switch circuit 121 is greater than 2.5V, to ensure that a large enough voltage can activate the battery management module 11.

[0039] In an embodiment, the voltage of the electrical signal is greater than 2.5V. In this embodiment, the voltage of the electrical signal is greater than 2.5V, and by configuring the resistance values of the resistance network 122 and the size of the switch tube Q1 in the first switch circuit 121, it is ensured that when the first switch circuit 121 is turned on, the voltage of the electrical signal is greater than 2.5V, to ensure that a large enough voltage can activate the battery management module 11.

[0040] This embodiment provides a battery protection module 1, as shown in Figure 2 which includes the battery management module 11 and the activation circuit 12 described above; the battery management module 11 is connected to the third end of the first switch circuit 121.

[0041] As an example, the battery management module 1 includes a battery management chip; the activation signal pin of the battery management chip is connected to the third end of the first switch circuit 121, to receive the electrical signal output by the third end of the first switch circuit 121 when the first switch circuit 121 is turned on, and enter the activated state. Exemplarily, the battery management chip can be a BQ40 series chip.

[0042] This embodiment provides a battery module, as shown in Figure 2 which includes the battery pack 2 and the battery protection module 1 described above; the battery is connected to the first end of the resistance network 122.

[0043] This embodiment provides an electronic device 3, as shown in Figure 1 and Figure 2As shown, the ground resistance R4 has a first end connected to the battery module and a second end grounded. In this embodiment, when the electronic device 3 is equipped with the battery module, the ground resistance R4 automatically forms a ground loop with the resistance network 122 in the battery module. Through the voltage division effect of the resistance network 122, a voltage difference is generated between the first end of the first switch circuit 121 and the second end of the first switch circuit 121 in the battery module, thereby controlling the first switch circuit 121 to be turned on. The third end of the first switch circuit 121 outputs an electrical signal to the battery management module 11, thereby activating the battery management module 11, that is, automatically activating the battery module.

[0044] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. An activation circuit, characterized by The first switch circuit, the resistance network and the capacitor circuit are included. The first end of the resistance network is used for connecting a battery pack, the second end of the resistance network is connected with the first end of the capacitor circuit, the first end of the first switch circuit is connected with the third end of the resistance network, the second end of the first switch circuit is connected with the fourth end of the resistance network, the third end of the first switch circuit is used for connecting a battery management module, and the second end of the capacitor circuit is used for connecting a grounding resistor in an electronic device.

2. The activation circuit of claim 1, wherein, The first switch circuit includes a switch tube.

3. The activation circuit of claim 2, wherein, The switch tube is a PMOS tube, the gate of the PMOS tube is connected with the third end of the resistance network, the source of the PMOS tube is connected with the fourth end of the resistance network, and the drain of the PMOS tube is used for connecting the battery management module.

4. The activation circuit of claim 1, wherein, The resistance network includes a first resistance circuit, a second resistance circuit and a third resistance circuit. The first resistance circuit, the second resistance circuit and the third resistance circuit are sequentially and serially arranged between the battery pack and the first end of the capacitor circuit. The connection node between the first resistance circuit and the second resistance circuit is connected with the first end of the first switch circuit, and the connection node between the second resistance circuit and the third resistance circuit is connected with the second end of the first switch circuit.

5. The activation circuit of claim 4, wherein, The voltage of the electric signal is greater than 2.5V.

6. A battery protection module, characterized by, The battery management module is connected with the third end of the first switch circuit.

7. The battery protection module of claim 6, wherein, The battery management module includes a battery management chip, and an activation signal pin of the battery management chip is connected with the third end of the first switch circuit.

8. A battery module, characterized by The battery management module includes a battery management chip, and an activation signal pin of the battery management chip is connected with the third end of the first switch circuit. The battery protection module includes a battery pack and the battery protection module as claimed in claim 6 or 7.

9. An electronic device, comprising: The battery pack is connected with the first end of the resistance network. The grounding resistor includes a first end used for connecting the battery module as claimed in claim 8 and a second end grounded.

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