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 an electronic device, the activation circuit comprises a first switch circuit, a resistance network and a self-reset switch circuit; the first end of the resistance network is used for connecting a battery pack, and the second end of the resistance network is grounded through the self-reset switch 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, and the third end of the first switching circuit is used for being connected with a battery management module; wherein when the self-reset switch circuit is triggered, the first switch circuit is switched on, so that the third end of the first switch circuit outputs an electric signal to activate the battery management module. According to the technical scheme, the third end of the first switch circuit outputs the electric signal to activate the battery management module, the circuit structure is simple, the cost is low, the battery management module is more conveniently activated through the self-reset switch circuit, and the user experience is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to an activation circuit, a battery protection module, a battery module and an electronic device. Background Art

[0002] With the rapid development of the lithium battery industry, lithium batteries are finding an increasing number of applications. However, due to their high voltage and high energy density, protection solutions are needed to ensure the safety of lithium batteries. Common protection features include overcharge voltage protection, over-discharge voltage protection, overcurrent protection, and short-circuit protection to ensure the proper functioning of battery packs. However, this also increases the self-consumption of the lithium battery protection board, significantly shortening the storage life of the lithium battery and failing to meet customer needs.

[0003] Therefore, to meet the long-term storage needs of lithium batteries, existing solutions generally rely on the microcontroller unit (MCU) on the battery protection board to automatically power down and put the battery into hibernation after a preset delay. However, to use the lithium battery again after hibernation, it must be activated. Currently, the most common method for activating lithium batteries is to use a charger, which means that users need to find a charger power source when the lithium battery product reaches them, resulting in a poor user experience. Utility Model Content

[0004] The embodiments of the present utility model provide an activation circuit, a battery protection module, a battery module and an electronic device to solve the problem of poor user experience in the existing activation method of lithium battery products.

[0005] An activation circuit includes a first switch circuit, a resistor network, and a self-resetting switch circuit;

[0006] The first end of the resistor network is used to connect to the battery pack, and the second end of the resistor network is grounded through the self-resetting switch circuit;

[0007] The first end of the first switch circuit is connected to the third end of the resistor network, the second end of the first switch circuit is connected to the fourth end of the resistor network, and the third end of the first switch circuit is used to connect to the battery management module; wherein, when the self-reset switch circuit is triggered, the first switch circuit is turned on to output an electrical signal through the third end of the first switch circuit to activate the battery management module.

[0008] Furthermore, the activation circuit further includes a capacitor circuit; the capacitor circuit is arranged between the self-resetting switch circuit and the second end of the resistor network.

[0009] Furthermore, the first switching circuit includes a switching tube.

[0010] Furthermore, the switching tube is a PMOS tube; the gate of the PMOS tube is connected to the third end of the resistor network, the source of the PMOS tube is connected to the fourth end of the resistor network, and the drain of the PMOS tube is used to connect to the battery management module.

[0011] Further, the resistance network includes a first resistance circuit, a second resistance circuit and a third resistance circuit;

[0012] The first resistance circuit, the second resistance circuit and the third resistance circuit are sequentially arranged in series between the battery pack and the self-reset switch circuit;

[0013] A connection node between the first resistance circuit and the second resistance circuit is connected to a first end of the first switch circuit, and a connection node between the second resistance circuit and the third resistance circuit is connected to a second end of the first switch circuit.

[0014] Furthermore, the voltage of the electrical signal is greater than 2.5V.

[0015] Furthermore, the self-resetting switch circuit includes a self-resetting push button switch.

[0016] A battery protection module comprises a battery management module and the above-mentioned activation circuit; the battery management module is connected to the third end of the first switch circuit.

[0017] A battery module, comprising a battery pack and the above-mentioned battery protection module;

[0018] The battery pack is connected to the first end of the resistor network.

[0019] An electronic device includes the above-mentioned battery module.

[0020] The above-mentioned activation circuit, battery protection module, battery module and electronic equipment, the activation circuit includes a first switch circuit, a resistor network and a self-reset switch circuit; the first end of the resistor network is used to connect to the battery, and the second end of the resistor network is grounded through the self-reset switch circuit; the first end of the first switch circuit is connected to the third end of the resistor network, the second end of the first switch circuit is connected to the fourth end of the resistor network, and the third end of the first switch circuit is used to connect to the battery management module. When the self-reset switch circuit is triggered, the first switch circuit is turned on to output an electrical signal through the third end of the first switch circuit to activate the battery management module. The circuit structure is simple and the cost is low. At the same time, the battery management module can be activated more conveniently through the self-reset switch circuit, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0022] Figure 1 This is a circuit diagram of an activation circuit in one embodiment of the present utility model;

[0023] Figure 2 It is a schematic diagram of a battery module in one embodiment of the present invention.

[0024] In the figure: 1. Battery protection module; 11. Battery management module; 12. Activation circuit; 121. First switch circuit; 122. Resistor network; 1221. First resistor circuit; 1222. Second resistor circuit; 1223. Third resistor circuit; 123. Self-reset switch circuit; 124. Capacitor circuit; 2. Battery pack. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] It should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to make the disclosure thorough and complete and to fully convey the scope of the present invention to those skilled in the art. In the drawings, the dimensions and relative dimensions of layers and regions may be exaggerated for clarity. Like reference numerals denote like elements throughout.

[0027] It should be understood that when an element or layer is referred to as being "on," "adjacent to," "connected to," or "coupled to" another element or layer, it may be directly on, adjacent to, connected to, or coupled to the other element or layer, or there may be intervening elements or layers. Conversely, when an element is referred to as being "directly on," "directly adjacent to," "directly connected to," or "directly coupled to" another element or layer, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers, and / or parts, these elements, components, regions, layers, and / or parts should not be limited by these terms. These terms are merely used to distinguish one element, component, region, layer, or part from another element, component, region, layer, or part. Therefore, without departing from the teachings of the present invention, the first element, component, region, layer, or part discussed below may be represented as a second element, component, region, layer, or part.

[0028] Spatially relative terms such as "under," "beneath," "below," "under," "above," "above," etc., may be used herein for convenience of description to describe the relationship of one element or feature shown in the figures to other elements or features. It should be understood that the spatially relative terms are intended to include different orientations of the device in use and operation in addition to the orientations shown in the figures. For example, if the device in the drawings is flipped, then the elements or features described as "under" or "beneath" or "beneath" the other elements will be oriented as "over" the other elements or features. Thus, the exemplary terms "under" and "under" may include both the upper and lower orientations. The device may be oriented otherwise (rotated 90 degrees or in other orientations) and the spatial descriptors used herein are interpreted accordingly.

[0029] The purpose of the terms used herein is only to describe specific embodiments and is not intended to limit the present invention. When used herein, the singular forms "a", "an" and " / the" are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "comprising" and / or "including", when used in this specification, determine the presence of features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0030] 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.

[0031] This embodiment provides an activation circuit 12, such as Figure 1 As shown, it includes a first switch circuit 121, a resistor network 122 and a self-reset switch circuit 123; the first end (B+) of the resistor network 122 is used to connect to the battery pack 2, and the second end of the resistor network 122 is grounded through the self-reset switch circuit 123; the first end of the first switch circuit 121 is connected to the third end of the resistor network 122, the second end of the first switch circuit 121 is connected to the fourth end of the resistor network 122, and the third end (PACK) of the first switch circuit 121 is used to connect to the battery management module 11; wherein, when the self-reset switch circuit 123 is triggered, 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.

[0032] The battery pack 2 includes a single or multiple battery cells. The battery cells are lithium-ion cells. Exemplarily, the operating voltage of the single battery cell is 2.5-4.2V. The battery management module 11 includes a battery management chip. Exemplarily, the battery management chip includes an activation signal input pin. When the battery management chip enters a dormant state and needs to be reactivated, the activation signal input pin receives an electrical signal, thereby activating the battery management chip via the electrical signal.

[0033] As an example, a first end of the resistor network 122 is connected to the battery pack 2, and a second end of the resistor network 122 is grounded via a self-resetting switch circuit 123. A first end of the first switch circuit 121 is connected to a third end of the resistor network 122, and a second end of the first switch circuit 121 is connected to a fourth end of the resistor network 122. The third end of the first switch circuit 121 is connected to an activation signal input pin of the battery management chip of the battery management module 11. In this example, when a user needs to activate the battery management module 11, the self-resetting switch circuit 123 is triggered, causing the self-resetting switch circuit to switch from an off state to an on state, and then to self-reset from the on state to an off state. When the self-resetting switch circuit switches from an off state to an on state, the resistor network 122 forms a ground loop with the battery pack 2 and ground. The voltage divider effect of the resistor network 122 generates a voltage difference between the first end and the second end of the first switch circuit 121, thereby controlling the first switch circuit 121 to conduct. 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. It can be understood that when the self-recovering switch circuit recovers from the on state to the off state, the resistor network 122 and the battery pack 2 and the ground can no longer form a grounding loop, thereby preventing the battery pack 2 from continuously discharging through the resistor network 122 and reducing the loss of the battery pack 2.

[0034] In this embodiment, the activation circuit 12 includes a first switching circuit 121, a resistor network 122 and a self-resetting switching circuit 123; the first end of the resistor network 122 is used to connect to the battery pack 2, and the second end of the resistor network 122 is grounded through the self-resetting switching circuit 123; the first end of the first switching circuit 121 is connected to the third end of the resistor network 122, and the second end of the first switching circuit 121 is connected to the fourth end of the resistor network 122. The third end of the first switching circuit 121 is used to connect to the battery management module 11. When the self-resetting switching circuit 123 is triggered, the first switching circuit 121 is turned on to output an electrical signal through the third end of the first switching circuit 121 to activate the battery management module 11. The circuit structure is simple and the cost is low. At the same time, the battery management module 11 can be activated more conveniently through the self-resetting switching circuit 123, thereby improving the user experience.

[0035] In one embodiment, the activation circuit 12 further includes a capacitor circuit 124 ; the capacitor circuit 124 is disposed between the self-resetting switch circuit 123 and the second end of the resistor network 122 .

[0036] The capacitor circuit 124 includes at least one capacitor. For example, the capacitor circuit 124 includes a capacitor C1. It is understood that the electrical parameters of the capacitor can be set based on actual experience and are not limited here.

[0037] In this embodiment, when the resettable switch circuit is triggered, at the moment the resettable switch circuit switches from the off state to the on state, the capacitor circuit 124 is turned on, and the resistor network 122 forms a ground loop with the battery pack 2 and the ground. The voltage divider effect of the resistor network 122 creates a voltage difference between the first terminal of the first switch circuit 121 and the second terminal of the first switch circuit 121, thereby controlling the first switch circuit 121 to conduct. The third terminal 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 resettable switch circuit is reset from the on state to the off state again, if the resettable switch circuit fails and cannot switch back to the off state, the capacitor circuit 124 provides DC isolation. Therefore, when the resettable switch circuit fails, the resistor network 122 is prevented from continuing to form a ground loop with the battery pack 2 and the ground, thereby reducing the power consumption of the battery pack 2.

[0038] In one embodiment, the first switch circuit 121 includes a switch tube Q1 .

[0039] As an example, the switch Q1 can be a field-effect transistor or a bipolar transistor. By connecting the gate or base of the switch Q1 to the third terminal of the resistor network 122 and the source or collector of the switch Q1 to the fourth terminal of the resistor network 122, when a voltage difference is generated between the third and fourth terminals of the resistor network 122, the switch Q1 is controlled to conduct, and an electrical signal is output to the battery management module 11 through the drain or emitter of the switch Q1 to activate the battery management module 11. In this embodiment, activating the battery management module 11 through the switch Q1 can improve the activation response speed.

[0040] In one embodiment, the switch tube Q1 is a PMOS tube; the gate of the PMOS tube is connected to the third end of the resistor network 122 , the source of the PMOS tube is connected to the fourth end of the resistor network 122 , and the drain of the PMOS tube is used to connect to the battery management module 11 .

[0041] In this embodiment, the switch tube Q1 is a PMOS tube, which is connected to the third end of the resistor network 122 through the gate of the PMOS tube, and the source of the PMOS tube is connected to the fourth end of the resistor network 122. The drain of the PMOS tube is used to connect to 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, reducing the power loss of the battery pack 2.

[0042] In one embodiment, the resistance network 122 includes 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 arranged in series between the battery pack 2 and the self-reset switch circuit 123; the connection node between the first resistance circuit 1221 and the second resistance circuit 1222 is connected to the first end 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 end of the first switch circuit 121.

[0043] The first resistor circuit 1221, the second resistor circuit 1222, and the third resistor circuit 1223 each include at least one resistor. For example, the first resistor circuit 1221 includes a resistor R1, the second resistor circuit 1222 includes a resistor R2, and the third resistor circuit 1223 includes a resistor R3. The resistance values ​​of the first resistor circuit 1221, the second resistor circuit 1222, and the third resistor circuit 1223 are set based on practical experience to ensure that the first switch circuit 121 can be turned on. After the first switch circuit 121 is turned on, the divided voltage between the first resistor circuit 1221 and the first switch circuit 121 is greater than 2.5V to ensure that a sufficiently high voltage can activate the battery management module 11.

[0044] In one embodiment, the voltage of the electrical signal is greater than 2.5 V. In this embodiment, the voltage of the electrical signal is greater than 2.5 V. By configuring the resistance value of the resistor network 122 and the size of the switch tube Q1 in the first switch circuit 121, it is ensured that the voltage of the electrical signal is greater than 2.5 V when the first switch circuit 121 is turned on, thereby ensuring that there is a sufficiently large voltage to activate the battery management module 11.

[0045] In one embodiment, the self-resetting switch circuit 123 includes a self-resetting push-button switch SW1. In this embodiment, the self-resetting push-button switch SW1 is provided to activate the battery management module 11, which is convenient for the user. Upon activation, the self-resetting push-button switch SW1 can also disconnect the ground loop of the resistor network 122, thereby reducing the loss of the battery pack 2.

[0046] This embodiment provides a battery protection module 1, such as Figure 2 As shown, it includes a battery management module 11 and the activation circuit 12 mentioned above; the battery management module 11 is connected to the third end of the first switch circuit 121.

[0047] This embodiment provides a battery module, such as Figure 2 As shown, it includes a battery pack 2 and the above-mentioned battery protection module 1; the battery pack 2 is connected to the first end of the resistor network 122.

[0048] This embodiment provides an electronic device including the above-mentioned battery module.

[0049] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the scope of protection of the present invention.

Claims

1. An activation circuit, characterized in that: It includes a first switch circuit, a resistor network and a self-resetting switch circuit; The first end of the resistor network is used to connect to the battery pack, and the second end of the resistor network is grounded through the self-resetting switch circuit; The first end of the first switch circuit is connected to the third end of the resistor network, the second end of the first switch circuit is connected to the fourth end of the resistor network, and the third end of the first switch circuit is used to connect to the battery management module; wherein, when the self-reset switch circuit is triggered, the first switch circuit is turned on to output an electrical signal through the third end of the first switch circuit to activate the battery management module.

2. The activation circuit according to claim 1, wherein: The activation circuit further includes a capacitor circuit; the capacitor circuit is arranged between the self-resetting switch circuit and the second end of the resistance network.

3. The activation circuit according to claim 1, wherein: The first switching circuit includes a switching tube.

4. The activation circuit according to claim 3, wherein: The switching tube is a PMOS tube; the gate of the PMOS tube is connected to the third end of the resistor network, the source of the PMOS tube is connected to the fourth end of the resistor network, and the drain of the PMOS tube is used to connect to the battery management module.

5. The activation circuit according to claim 1, wherein: The resistor network includes a first resistor circuit, a second resistor circuit and a third resistor circuit; The first resistance circuit, the second resistance circuit and the third resistance circuit are sequentially arranged in series between the battery pack and the self-reset switch circuit; A connection node between the first resistance circuit and the second resistance circuit is connected to a first end of the first switch circuit, and a connection node between the second resistance circuit and the third resistance circuit is connected to a second end of the first switch circuit.

6. The activation circuit according to claim 5, wherein: The voltage of the electrical signal is greater than 2.5V.

7. The activation circuit according to claim 1, wherein: The self-resetting switch circuit includes a self-resetting push button switch.

8. A battery protection module, characterized in that: It comprises a battery management module and the activation circuit according to any one of claims 1 to 7; the battery management module is connected to the third end of the first switch circuit.

9. A battery module, characterized in that: comprising a battery pack and the battery protection module according to claim 8; The battery pack is connected to the first end of the resistor network.

10. An electronic device, characterized in that: Comprising the battery module as claimed in claim 9.

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