Protection devices, battery modules, terminals and electronic devices

Abstract

This utility model discloses a protection device, a battery module, a terminal, and an electronic device, relating to the field of battery protection technology. The protection device includes a protection circuit and a control circuit. The protection circuit includes a switching sub-circuit, and the control circuit is located at the terminal. The switching sub-circuit is connected to the control circuit and is adapted to connect the battery and a load in the terminal. The switching sub-circuit is configured to, under the control of the control circuit, at least disconnect or establish a power supply connection between the battery and the load. By incorporating a switching sub-circuit in the protection circuit and placing the control circuit controlling the switching sub-circuit at the terminal, the discharge of the battery in the battery module can be reduced during battery module turnover, thereby increasing the storage time of the battery module. Simultaneously, the space occupied by the protection circuit can be reduced, allowing the battery to occupy more space within a given battery module volume, facilitating an increase in battery capacity.

Description

Technical Field

[0001] This utility model relates to the field of battery protection technology, and in particular to a protection device, control circuit, terminal and electronic device. Background Technology

[0002] With the development of communication technology, users are increasingly obtaining information from electronic devices, which has led to higher demands on battery modules in these devices. Since battery modules may experience issues such as external discharge and short circuits during their production and use with electronic devices, related technologies propose adding protection circuits to the battery module.

[0003] However, the protection circuits mentioned above generally include a protection chip, which shortens the storage time of the battery module and occupies more space in the battery module, resulting in less space occupied by the battery in the battery module and affecting the battery capacity. Utility Model Content

[0004] The purpose of this invention is to provide a protection device, battery module, terminal, and electronic device to increase the storage time of the battery module and reduce the space occupied by the protection circuit.

[0005] In a first aspect, this utility model proposes a protection device, comprising: a protection circuit and a control circuit, wherein the protection circuit includes a switch sub-circuit, the control circuit is disposed in a terminal, the switch sub-circuit is connected to the control circuit and adapted to connect a battery and a load in the terminal, and the switch sub-circuit is configured to, under the control of the control circuit, at least disconnect or establish a power supply connection between the battery and the load.

[0006] For example, the switching sub-circuit (11) includes a first switching unit (Q1), a first end of the first switching unit (Q1) is adapted to connect to the first pole of the battery (30), a second end of the first switching unit (Q1) is adapted to connect to at least the first power supply terminal of the load (40), and a control terminal of the first switching unit (Q1) is adapted to connect to the control pin of the first control sub-circuit (21) in the control circuit (20).

[0007] For example, the first switch unit (Q1) includes a first controllable switch (S1) and a second controllable switch (S2). The first end of the first controllable switch (S1) is adapted to connect to the first pole of the battery (30). The second end of the first controllable switch (S1) is connected to the first end of the second controllable switch (S2). The second end of the second controllable switch (S2) is adapted to connect to at least the first power supply terminal of the load (40). The control end of the first controllable switch (S1) is adapted to connect to the first control pin of the first control sub-circuit (21). The control end of the second controllable switch (S2) is adapted to connect to the second control pin of the first control sub-circuit (21).

[0008] For example, the second end of the first switching unit (Q1) is also adapted to be connected to the first power supply end of the control circuit (20).

[0009] For example, the protection circuit (10) further includes a current limiting sub-circuit (12), the first end of which is adapted to be connected to the battery (30), and the second end of which is adapted to be connected to the power supply terminal of the control circuit (20).

[0010] For example, the current limiting sub-circuit (12) includes a first resistor (R1), a first end of which is adapted to be connected to the first or second terminal of the battery (30), and a second end of which is adapted to be connected to the first or second power supply terminal of the control circuit (20).

[0011] For example, the current limiting sub-circuit (12) further includes a current limiting switch (Qx), which is connected in series with the first resistor (R1), and the control terminal of the current limiting switch (Qx) is adapted to be connected to the control pin of the first control sub-circuit (21).

[0012] For example, the switch sub-circuit (11) further includes at least one second switch unit (Q2), the at least one second switch unit (Q2) is connected in series with the first switch unit (Q1), and the control unit (20) includes at least one second control sub-circuit (22); the second control sub-circuit (22) is correspondingly arranged with the second switch unit (Q2), and the control terminal of the second switch unit (Q2) is adapted to be correspondingly connected to the control pin of the second control sub-circuit (22).

[0013] For example, the structure of the second switching unit (Q2) is the same as that of the first switching unit (Q1).

[0014] For example, the switch sub-circuit (11) further includes a controllable fuse unit (111), which is connected in series with the first switch unit (Q1), and the control terminal of the controllable fuse unit (111) is adapted to connect to the control pin of the third control sub-circuit (23) in the control circuit (20).

[0015] For example, the controllable fuse unit (111) includes: a second resistor (R2), a third resistor (R3), a controllable fuse (F), and a fifth controllable switch (S5). The first end of the controllable fuse (F) is adapted to connect to the first pole of the battery (30). The second end of the controllable fuse (F) is connected to the first end of the first switch unit (Q1). The third end of the controllable fuse (F) is connected to the first end of the fifth controllable switch (S5). The second end of the fifth controllable switch (S5) is grounded (AGND). The control terminal of the fifth controllable switch (S5) is adapted to connect to the control pin of the third control sub-circuit (23). The first end of the second resistor (R2) is connected to the third end of the controllable fuse (F). The second end of the second resistor (R2) is connected to the first end of the fifth controllable switch (S5). The third resistor (R3) is connected in parallel with the second resistor (R2).

[0016] For example, the controllable fuse unit (111) further includes at least one of a first capacitor (C1), a second capacitor (C2), and a fourth resistor (R4);

[0017] The first terminal of the first capacitor (C1) is connected to the first terminal of the fifth controllable switch (S5), and the second terminal of the first capacitor (C1) is connected to the second terminal of the fifth controllable switch (S5).

[0018] The first terminal of the second capacitor (C2) is connected to the control terminal of the fifth controllable switch (S5), and the second terminal of the second capacitor (C2) is grounded (AGND).

[0019] The first end of the fourth resistor (R4) is connected to the control terminal of the fifth controllable switch (S5), and the second end of the fourth resistor (R4) is grounded (AGND).

[0020] For example, the protection circuit (10) further includes a first connection line L1, a first end of which is adapted to connect to the second pole of the battery (30), and a second end of which is adapted to connect to at least the second power supply terminal of the load (40).

[0021] For example, the protection circuit (10) further includes a second connection line L2, the first end of which is adapted to connect to the second pole of the battery (30), and the second end of which is adapted to connect to the second power supply terminal of the control circuit (20).

[0022] Secondly, this utility model proposes a battery module, including: a battery, and a protection circuit in the protection device described in the first aspect.

[0023] Thirdly, this utility model proposes a terminal, comprising: a control circuit and a load, wherein the control circuit is adapted to connect to the protection circuit in the protection device described in the first aspect above, and the control circuit is configured to control the switching sub-circuit in the protection circuit to at least disconnect or establish a power supply connection between the battery and the load.

[0024] For example, the switch sub-circuit (11) includes a first switch unit (Q1), a first end of which is adapted to be connected to the first pole of the battery (30), and a second end of which is adapted to be connected to at least the first power supply terminal of the load (40).

[0025] The control circuit (20) includes a first control sub-circuit (21), and the control pins of the first control sub-circuit (21) are adapted to be connected to the control terminal of the first switching unit (Q1).

[0026] For example, the first control sub-circuit (21) includes a first protection chip (U1), the second power supply terminal of the first protection chip (U1) is adapted to be connected to the second pole of the battery (30), the first power supply terminal of the first protection chip (U1) is adapted to be connected to the second terminal of the first switching unit (Q1), or, adapted to be connected to the second terminal of the current limiting sub-circuit (12) in the protection circuit (10), and the control pin of the first protection chip (U1) is adapted to be connected to the control terminal of the first switching unit (Q1).

[0027] For example, the first control sub-circuit (21) further includes a third capacitor (C3) and a fifth resistor (R5);

[0028] The first end of the third capacitor (C3) is connected to the second power supply terminal of the first protection chip (U1) and is adapted to be connected to the second pole of the battery (30). The second end of the third capacitor (C3) is connected to the first power supply terminal of the first protection chip (U1) and the first end of the fifth resistor (R5) respectively. The second end of the fifth resistor (R5) is adapted to be connected to the second end of the first switching unit (Q1) or to be connected to the second end of the current limiting sub-circuit (12) in the protection circuit (10).

[0029] For example, the first control sub-circuit (21) further includes a sixth controllable switch (S6), the first end of which is connected to the first power supply terminal of the first protection chip (U1), and the second end of which is adapted to be connected to the second end of the current limiting sub-circuit (12) in the protection circuit (10).

[0030] For example, the first control sub-circuit (21) further includes a current sensing resistor (RS1), the first current sensing pin of the first protection chip (U1) is connected to the first end of the current sensing resistor (RS1), the second current sensing pin of the first protection chip (U1) is connected to the second end of the current sensing resistor (RS1), the first end of the current sensing resistor (RS1) is adapted to be connected to the second end of the first switching unit (Q1), and the second end of the current sensing resistor (RS1) is adapted to be connected to the first power supply end of the load (40).

[0031] For example, the first control sub-circuit (21) further includes a sixth resistor (R6) and a seventh resistor (R7), the sixth resistor (R6) being connected between the first current detection pin of the first protection chip (U1) and the first end of the current detection resistor (RS1), and the seventh resistor (R7) being connected between the second current detection pin of the first protection chip (U1) and the second end of the current detection resistor (RS1).

[0032] For example, the switch sub-circuit (11) further includes at least one second switch unit (Q2), and at least one second switch unit (Q2) is connected in parallel or in series with the first switch unit (Q1);

[0033] The control circuit (20) includes at least one second control sub-circuit (22) corresponding to at least one second switch unit (Q2), and the control pin of the second control sub-circuit (22) is adapted to connect to the control terminal of the corresponding second switch unit (Q2).

[0034] For example, the second control sub-circuit (22) has the same structure as the first control sub-circuit (21).

[0035] For example, the switch sub-circuit (11) further includes a controllable fuse unit (111), the first end of which is adapted to be connected to the first pole of the battery (30), and the second end of which is connected to the first end of the first switch unit (Q1).

[0036] The control circuit (20) includes a third control sub-circuit (23), and the control pins of the third control sub-circuit (23) are adapted to connect to the control terminal of the controllable fuse unit (111).

[0037] For example, the terminal (200) further includes:

[0038] An activation circuit, comprising an activation power supply, wherein the activation power supply is connected to the power supply terminal of the control circuit (20).

[0039] For example, the activation power source includes at least one of a photovoltaic power source, a piezoelectric power source, and a thermoelectric power source;

[0040] When the activation power source includes the photovoltaic power source, the activation circuit also includes an activation switch, which is connected between the photovoltaic power source and the power supply terminal of the control circuit (20).

[0041] Fourthly, this utility model proposes an electronic device, comprising: the battery module described in the second aspect and the terminal described in the third aspect.

[0042] This utility model discloses a protection device, a battery module, a terminal, and electronic equipment. The protection device includes a protection circuit and a control circuit. The protection circuit includes a switching sub-circuit. The control circuit is located in the terminal. The switching sub-circuit is connected to the control circuit and is adapted to connect the battery and a load in the terminal. The switching sub-circuit is configured to at least disconnect or establish a power supply connection between the battery and the load under the control of the control circuit. By setting the switching sub-circuit in the protection circuit and placing the control circuit controlling the switching sub-circuit in the terminal, the space occupied by the protection circuit can be reduced. With a fixed battery module volume, the battery can occupy more space, facilitating an increase in battery capacity.

[0043] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the structure and connection of a protection device according to an embodiment of the present invention;

[0045] Figure 2 This is a schematic diagram of the structure and connection of the protective device according to another embodiment of the present invention;

[0046] Figure 3(a) is a circuit topology diagram of the protection circuit of the first embodiment of this utility model;

[0047] Figure 3(b) is a circuit topology diagram of the control circuit of the first embodiment of this utility model;

[0048] Figure 4(a) is a circuit topology diagram of a protection circuit according to one embodiment of the second embodiment of the present invention;

[0049] Figure 4(b) is a circuit topology diagram of the protection circuit of another embodiment of the second embodiment of the present invention;

[0050] Figure 5 This is a circuit topology diagram of the control circuit of the second embodiment of this utility model;

[0051] Figure 6 This is a circuit topology diagram of the control circuit of the third embodiment of this utility model;

[0052] Figure 7 This is a circuit topology diagram of the protection circuit of the third embodiment of this utility model;

[0053] Figure 8 This is a circuit topology diagram of the control circuit of the fourth embodiment of this utility model;

[0054] Figure 9 This is a circuit topology diagram of the protection circuit of the fourth embodiment of this utility model;

[0055] Figure 10 This is a circuit topology diagram of the control circuit of the fifth embodiment of this utility model;

[0056] Figure 11 This is a structural block diagram of the battery module according to an embodiment of the present invention;

[0057] Figure 12 This is a structural block diagram of the terminal according to an embodiment of the present utility model;

[0058] Figure 13 This is a structural block diagram of the electronic device according to an embodiment of the present invention. Detailed Implementation

[0059] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0060] The protection device, battery module, terminal, and electronic device of the present invention are described below with reference to the accompanying drawings.

[0061] In some embodiments of this utility model, such as Figure 1As shown, the protection device 1 includes a protection circuit 10 and a control circuit 20 for protecting the battery 30. The protection circuit 10 includes a switching sub-circuit 11. The control circuit 20 is located at the terminal. The switching sub-circuit 11 is connected to the control circuit 20 and adapted to connect the battery 30 and the load 40 in the terminal 200. The switching sub-circuit 11 is configured to at least disconnect or establish a power supply connection between the battery 30 and the load 40 under the control of the control circuit 20. The protection circuit 10 can be located between the battery 30 and the terminal 200, or it can be located together with the battery 30 in the battery module 100. Figure 1 (For example, it is set in the battery module 100) so as to facilitate assembly with the terminal 200.

[0062] In one implementation, see Figure 1 The battery module 100 includes a battery 30 and a protection circuit 10, and the terminal 200 includes a control circuit 20 and a load 40. The battery 30 has two polarities, one positive and one negative. The protection circuit 10 can be mounted on a protection board (such as a printed circuit board), which has a first connection terminal and a second connection terminal. A switch sub-circuit 11 is connected between the first and second connection terminals and may include one or more switches. The first connection terminal is used to connect to the battery 30 and includes polarity ports B+ and B- for connecting the positive and negative terminals of the battery 30, respectively. The second connection terminal is used to connect to the terminal 200 and includes polarity ports P+ and P- and a control port K. Polarity ports P+ and P- are used to connect to the power supply terminals of the control circuit 20 and the load 40 in the terminal 200, respectively, and the control port K is used to connect the control pins of the control circuit 20 and the control terminals of the switches in the switch sub-circuit 11. It should be noted that when the control circuit 20 and the load 40 share a power supply terminal, a pair of polarity ports P+ and P- can be used; when the control circuit 20 and the load 40 do not share a power supply terminal, the polarity ports of the second connection terminal can have two pairs (P1+, P1- and P2+, P2- as shown in Figure 3); when the control circuit 20 and the load 40 share a power supply terminal of the same polarity (such as the negative power supply terminal), the polarity ports of the second connection terminal can have three.

[0063] The protection device 1 of this utility model includes a protection circuit 10 and a control circuit 20. The protection circuit 10 includes a switch sub-circuit 11. When the battery module 100 containing the battery 30 is not installed in the terminal 200, the switch sub-circuit 11 can be in a normally open state, and the battery 30 does not supply power to the load 40 or the control circuit 20. At this time, the battery module 100 does not discharge during turnover. Furthermore, the control circuit 20 is located in the terminal 200, that is, the battery module 100 does not contain the control circuit 20, which makes the space utilization of the battery module 100 higher, that is, it provides more space for the battery 30 in the battery module 100 to increase its capacity, which is beneficial to increasing the working time of the terminal 200. After the battery module 100 is installed in the terminal 200, when the switch sub-circuit 11 establishes a power supply connection between the battery 30 and the terminal 200, the battery 30 can supply power to the load 40 and the control circuit 20, and the control circuit 20 can detect the voltage of the battery 30. When the voltage of battery 30 is lower than the preset over-discharge protection voltage, the control circuit 20 can control the switch sub-circuit 11 to at least disconnect the power supply connection between battery 30 and load 40 in terminal 200. At this time, battery 30 will not discharge to load 40, which reduces the power consumption of battery 30, prevents battery 30 from being over-discharged, and increases the storage time of battery 30.

[0064] It should be noted that when the battery module 100 is assembled with the terminal 200, the switch sub-circuit 11 in the protection circuit 10 is in an open-circuit state, the control circuit 20 cannot receive power, and the battery 30 of the battery module 100 has no output. Therefore, when the battery module 100 is first installed in the terminal 200, the control circuit 20 can be activated first. Specifically, power can be supplied to the control circuit 20. After the control circuit 20 is powered on, it can control the switch sub-circuit 11 to establish a power supply connection between the battery 30 and the terminal 200, so that the battery 30 can provide a continuous operating voltage to the control circuit 20.

[0065] For example, the activation methods of the control circuit 20 may include: external power supply activation (such as activation by plugging in a charger), and dedicated activation power supply activation (such as photovoltaic power supply activation, piezoelectric power supply activation, thermoelectric power supply activation, etc.). Among them, such as... Figure 2As shown, an activation circuit 60 can be installed on the terminal 200. The activation circuit 60 includes an activation power supply 61, which is connected to the power supply terminal of the control circuit 20 and can provide activation voltage to the control circuit 20. Its size is relatively small (like a photovoltaic power supply in a calculator). The difference between photovoltaic power supplies, piezoelectric power supplies, and thermoelectric power supplies lies in the way they generate voltage. Photovoltaic power supplies use light energy to generate voltage, meaning they can be used to activate the control circuit 20 wherever there is light. Piezoelectric power supplies use the piezoelectric effect to generate voltage, and thermoelectric power supplies use thermal differences to generate voltage. Since the voltage generated by piezoelectric and thermoelectric power supplies is easy to control, while the voltage generated by photovoltaic power supplies is not, when using photovoltaic power supply activation, an activation switch can be installed between the output terminal of the photovoltaic power supply and the power supply terminal of the control circuit 20. This activation switch can be closed when the control circuit 20 needs to be activated, thereby preventing uncontrollable activation of the control circuit 20 in the presence of light and reducing over-discharge of the battery 30.

[0066] In some embodiments of this utility model, such as Figure 2 As shown, the switch sub-circuit 11 includes a first switch unit Q1, the first end of which is adapted to be connected to the first terminal of the battery 30. Figure 2 Taking the positive terminal as an example, the second end of the first switching unit Q1 is adapted to connect at least to the first power supply terminal of the load 40 (and may also connect to the first power supply terminal of the control circuit 20), and the control terminal of the first switching unit Q1 is adapted to connect to the control pin of the first control sub-circuit 21 in the control circuit 20. The first switching unit Q1 is configured to establish at least a power supply connection between the first terminal of the battery 30 and the first power supply terminal of the load 40 under the control of the first control sub-circuit 21.

[0067] It should be noted that the battery 30 includes a first electrode and a second electrode. The first electrode can be either the positive or negative electrode of the battery 30, and the polarity of the second electrode of the battery 30 is opposite to that of the first electrode.

[0068] In this embodiment, exemplarily, see [link to example]. Figure 2 The protection circuit 10 also includes a first connecting line L1, the first end of which is adapted to connect to the second pole of the battery 30, and the second end of which is adapted to connect to at least the second power supply terminal of the load 40 (and may also connect to the second power supply terminal of the control circuit 20).

[0069] As one implementation method, see Figure 2Taking the control circuit 20 and load 40 sharing a common positive and negative power supply terminal as an example, during the use of terminal 200, battery 30 supplies power to both control circuit 20 and load 40. Control circuit 20 continuously monitors the voltage of battery 30. When the voltage is lower than the preset over-discharge protection voltage value, control circuit 20 can control the first switch unit Q1 to disconnect the power supply connection between battery 30 and terminal 200. At this time, both control circuit 20 and load 40 lose power and stop working. Battery 30 will not discharge externally, reducing power consumption and thus increasing the storage time of battery module 100. At the same time, it can also ensure the safety of battery 30, protection device 1, terminal 200, etc. Furthermore, the electrical components in the protection circuit 10 at the battery module 100 end are only the switching devices in the first switch unit Q1 (setting the first switch unit Q1 at the battery module 100 end allows for shorter wiring between the switching devices and battery 30, thereby reducing parasitic inductance and resistance and improving current control accuracy), occupying little space.

[0070] In some examples, such as Figure 2 As shown, the first switching unit Q1 includes a first controllable switch S1 and a second controllable switch S2. The first end of the first controllable switch S1 is adapted to connect to the first terminal of the battery 30, and the second end of the first controllable switch S1 is connected to the first end of the second controllable switch S2. The second end of the second controllable switch S2 is adapted to connect to at least the first power supply terminal of the load 40. Figure 2 The diagram shows that the first power supply terminal of the control circuit 20 can also be connected. The control terminal of the first controllable switch S1 is adapted to connect to the first control pin of the first control sub-circuit 21 in the control circuit 20, and the control terminal of the second controllable switch S2 is adapted to connect to the second control pin of the first control sub-circuit 21 in the control circuit 20.

[0071] The first controllable switch S1 is configured to selectively conduct bidirectionally or conduct along a first direction under the action of the first control signal output by the first control sub-circuit 21, and the second controllable switch S2 is configured to selectively conduct bidirectionally or conduct along a second direction under the action of the second control signal output by the first control sub-circuit 21, wherein the first direction and the second direction are opposite to each other.

[0072] For example, the first controllable switch S1 includes a first switching transistor and a first diode. The first end of the first switching transistor is connected to the cathode of the first diode and is adapted to connect to the first electrode of the battery 30. The second end of the first switching transistor is connected to the anode of the first diode and the first end of the second controllable switch S2. The control end of the first switching transistor is connected to the first control pin of the first control sub-circuit 21.

[0073] For example, the second controllable switch S2 includes a second switching transistor and a second diode. The first terminal of the second switching transistor is connected to the second terminal of the first controllable switch S1 and the anode of the second diode. The second terminal of the second switching transistor is connected to the cathode of the second diode and is adapted to connect at least to the first power supply terminal of the load 40. Figure 2 The diagram shows that the first power supply terminal of the control circuit 20 can also be connected, and the control terminal of the second switching transistor is connected to the second control pin of the first control sub-circuit 21.

[0074] Specifically, the first control sub-circuit 21 includes a first protection chip U1, the second power supply terminal of the first protection chip U1 is adapted to be connected to the second pole of the battery 30, the first power supply terminal of the first protection chip U1 is adapted to be connected to the second terminal of the first switching unit Q1, and the control pin of the first protection chip U1 is adapted to be connected to the control terminal of the first switching unit Q1.

[0075] For example, as shown in FIG3, the first control sub-circuit 21 may further include a third capacitor C3 and a fifth resistor R5. The second power supply terminal of the first protection chip U1 is connected to the first terminal of the third capacitor C3 and is adapted to connect to the second terminal of the battery 30. The first power supply terminal of the first protection chip U1 is connected to the second terminal of the third capacitor C3 and the first terminal of the fifth resistor R5, respectively. The second terminal of the fifth resistor R5 is adapted to connect to the second terminal of the first switching unit Q1. The control pin of the first protection chip U1 is adapted to connect to the control terminal of the first switching unit Q1. Optionally, only the third capacitor C3 or only the fifth resistor R5 may be provided.

[0076] Among them, the fifth resistor R5 can play an anti-interference role; the third capacitor C3 has the characteristic of preventing voltage sudden change, which can prevent the first protection chip U1 from malfunctioning and issuing an incorrect switching signal when the circuit is subjected to interference signals, thereby causing the switch to malfunction.

[0077] Referring to Figure 3, when battery 30 supplies power to terminal 200, the first protection chip U1 detects the voltage of battery 30 through the inputs of VDD (i.e., the first power supply terminal of the first protection chip U1) and VSS (i.e., the second power supply terminal of the first protection chip U1) pins. When the voltage is lower than the preset over-discharge protection voltage value, the DSG pin (i.e., the first control pin) of the first protection chip U1 outputs a low level, which is transmitted to the control terminal of the first switching transistor through the Q1D port of terminal 200 and the control port Q1D of the protection board. The first switching transistor is turned off due to the low level of the control terminal. At the same time, the CHG pin (second control pin) of the first protection chip U1 outputs a high level, which is transmitted to the control terminal of the second switching transistor through the Q1C port of terminal 200 and the control port Q1C of the protection board. The second switching transistor is turned on due to the high level of the control terminal. At this time, battery 30 cannot discharge externally, but it can be charged. When the charger is plugged into the terminal 200, the external power supply can supply power to the first protection chip U1 and charge the battery 30. The charging current flows into the battery 30 through the parasitic diode (i.e., the first diode) of the charging switch (i.e., the second switching transistor) and the discharge switch (i.e., the first switching transistor).

[0078] During the charging process of battery 30, the first protection chip U1 can detect the voltage of battery 30. When the voltage is between the preset over-discharge and over-charge protection voltage values, the DSG and CHG pins of the first protection chip U1 both output a high level, and the charging and discharging switches are both turned on, allowing battery 30 to discharge and charge. When the voltage is higher than the preset overcharge protection voltage value, the CHG pin of the first protection chip U1 outputs a low level, and the charging switch is turned off due to the low level at the control terminal, preventing battery 30 from charging. However, it can still discharge through the discharge switch and the parasitic diode (i.e., the second diode) of the charging switch to terminal 200. It should be noted that, in the above-mentioned on / off control of the switching transistor, to avoid frequent switching operations, the first protection chip U1 can be set with a hysteresis voltage, such as 0.1 to 0.5V.

[0079] In some embodiments of this utility model, as shown in FIG4(a), the protection circuit 10 further includes a current limiting sub-circuit 12. The first end of the current limiting sub-circuit 12 is adapted to connect to the battery 30 (which can be connected to the positive and / or negative terminals of the battery 30; FIG4 shows the connection to the positive terminal of the battery 30 as an example). The second end of the current limiting sub-circuit 12 is adapted to connect to the power supply terminal of the control circuit 20.

[0080] Battery 30 supplies power to control circuit 20 through current limiting sub-circuit 12, which limits the current supply to control circuit 20, preventing short circuits between battery 30 and control circuit 20, thereby protecting control circuit 20. It should be noted that at this time, battery 30 can supply power to load 40 through another power supply line (a power supply line independent of control circuit 20).

[0081] For example, referring to Figure 4(a), the current limiting sub-circuit 12 includes a first resistor R1. The first end of the first resistor R1 is adapted to connect to the first terminal of the battery 30, and the second end of the first resistor R1 is adapted to connect to the first power supply terminal of the control circuit 20. Optionally, the first resistor R1 can also be connected between the second terminal of the battery 30 and the second power supply terminal of the control circuit 20; the number of first resistors R1 can also be multiple, such as two, one connected between the positive terminal of the battery 30 and the positive power supply terminal of the control circuit 20, and the other connected between the negative terminal of the battery 30 and the negative power supply terminal of the control circuit 20. The first resistor R1 can be used for current limiting to prevent short circuits between the battery 30 and the control circuit 20. When R1 is connected to the first power supply terminal of the control circuit 20, R5 can be omitted, i.e., current limiting is achieved solely through R1; alternatively, R5 can be included, in which case the current is limited by the series connection of R1 and R5, and the portion of R5 near the first protection chip U1 can provide anti-interference. R1 can also prevent large-current discharge of the battery 30 when the signal line is short-circuited.

[0082] In one embodiment, as shown in FIG4(b), the current limiting sub-circuit 12 further includes a current limiting switch Qx, which is connected in series with the first resistor R1. The control terminal of the current limiting switch Qx is adapted to connect to the control pin of the first control sub-circuit 21. The control pin can be the first control pin of the first control sub-circuit 21, that is, the control terminal of the current limiting switch Qx shares the control pin with the control terminal of the first controllable switch S1, or it can be other control pins of the first control sub-circuit 21.

[0083] By setting a current-limiting switch Qx in the sampling circuit, since it is only used for signal line detection and the current value is small, the overcurrent and package size of the current-limiting switch Qx can be set to be smaller. This allows the control circuit 20 to be completely disconnected from the battery 30 during over-discharge, thus avoiding power consumption. At the same time, it also avoids the problem of small current discharge when the battery module 100 has a finite resistance connection during turnover. In addition, when the control terminal of the current-limiting switch Qx shares a control pin with the control terminal of the first controllable switch S1, wiring can be reduced and the control complexity can be lowered.

[0084] In this embodiment, referring to Figures 4(a) and 4(b), the protection circuit 10 further includes a second connecting line L2. The first end of the second connecting line L2 is adapted to connect to the second terminal of the battery 30 (shown as the negative terminal in Figure 4), and the second end of the second connecting line L2 is adapted to connect to the second power supply terminal of the control circuit 20. At this time, see... Figure 5 The second end of the fifth resistor R5 serves as the first power supply terminal of the control circuit 20, and is suitable for connecting to the second end of the current limiting sub-circuit 12 in the protection circuit 10 (the first end of the current limiting sub-circuit 12 is suitable for connecting to the first pole of the battery 30). By setting the second connecting line L2 and the current limiting sub-circuit 12, the load 40 and the control circuit 20 can use independent power supply lines, which can reduce the interference between the two power supply circuits.

[0085] Specifically, as shown in Figure 4, Figure 5 As shown, the second connection terminal of the protection board can be equipped with four polarity ports P1-, P1+, P2-, and P2+. P1- and P1+ correspond to the power supply terminals of the load 40, and P2- and P2+ correspond to the power supply terminals of the control circuit 20. The battery 30 supplies power to the first protection chip U1 through the P2- and P2+ terminals to enable its operation. Because the control circuit 20 is located at terminal 200, the detected voltage during battery 30 charging and discharging is the battery 30 voltage plus the voltage division of the loop impedance. If the detected voltage is higher than the battery 30 voltage during charging, the battery 30 cannot be fully charged; if the detected voltage is lower than the battery 30 voltage during discharging, the battery 30 cannot fully discharge its charge. To accurately detect the battery 30 voltage, a dedicated battery 30 current limiting sub-circuit 12 is set on the protection board to solve the problem of inaccurate voltage detection caused by the loop voltage drop during battery 30 charging and discharging. In the current-limiting sub-circuit 12, the resistance value of the first resistor R1 can generally be selected from 100 to 1000 ohms. If the value is too small, the current-limiting effect will be insufficient; if the value is too large, it will affect the voltage detection accuracy of the first protection chip U1. In addition, the setting of the first resistor R1 can also prevent short circuits, overcharging, and other problems from occurring during the battery module 100 cycles.

[0086] In some embodiments, to prevent the battery 30 from discharging the control circuit 20 during over-discharge, a switch (such as...) can be provided at the first power supply terminal of the first protection chip U1. Figure 6 The sixth controllable switch S6 shown is turned off to completely disconnect the first protection chip U1 from the battery 30, thus preventing the protection chip U1 from consuming power. See also Figure 6 The first end of the sixth controllable switch S6 is connected to the second end of the fifth resistor R5, and the second end of the sixth controllable switch S6 is adapted to connect to the second end of the current limiting sub-circuit 12 in the protection circuit 10.

[0087] In some embodiments of this utility model, such as Figure 7 As shown, the switch sub-circuit 11 also includes at least one second switch unit Q2, which is connected in series with the first switch unit Q1. The control terminal of the at least one second switch unit Q2 is adapted to be connected to the control pin of at least one second control sub-circuit 22 in the control circuit 20.

[0088] Specifically, in one embodiment, there is one second switching unit Q2, which can be connected in series with the first switching unit Q1. In another embodiment, there are multiple second switching units Q2, which can be connected in series and / or in parallel before being connected in series with the first switching unit Q1.

[0089] For example, see Figure 7The structure of the second switching unit Q2 is the same as that of the first switching unit Q1. Correspondingly, see [link to relevant documentation]. Figure 8 The structure of the second control sub-circuit 22 is the same as that of the first control sub-circuit 21.

[0090] Specifically, see Figure 7 The second switching unit Q2 includes a third controllable switch S3 and a fourth controllable switch S4. The third controllable switch S3 includes a third switching transistor and a third diode, and the fourth controllable switch S4 includes a fourth switching transistor and a fourth diode. See also Figure 8 The second control sub-circuit 22 includes a second protection chip U2, a capacitor C3', and a resistor R5'. By setting the first switching unit Q1 and the second switching unit Q2 (i.e., the protection circuit 10 has two levels of switches), two levels of protection for the battery 30 can be achieved. Correspondingly, the control circuit 20 also has two levels, namely the first control sub-circuit 21 and the second control sub-circuit 22. The protection thresholds (over-discharge and over-charge thresholds) of the two control sub-circuits can be equal or have a size-to-size relationship to protect the battery 30 of the battery module 100.

[0091] In some embodiments of this utility model, such as Figure 9 As shown, the switch sub-circuit 11 also includes a controllable fuse unit 111, which is connected in series with the first switch unit Q1. The control terminal of the controllable fuse unit 111 is adapted to connect to the control pin of the third control sub-circuit 23 in the control circuit 20.

[0092] By configuring the first switching unit Q1 and the controllable fuse unit 111, two-level protection for the battery 30 can also be achieved. Correspondingly, the control circuit 20 is also configured with two levels, namely the first control sub-circuit 21 and the third control sub-circuit 23. Figure 10 As shown, the third control sub-circuit 23 is similar in structure to the first control sub-circuit 21. The difference is that the control pin of the third control sub-circuit 23 outputs a control signal for controlling the controllable fuse unit 111, and only one control signal is needed; the control pin of the first control sub-circuit 21 outputs a control signal for controlling the first switch unit Q1, and two control signals are needed.

[0093] See in some examples Figure 9The controllable fuse unit 111 includes: a second resistor R2, a third resistor R3, a controllable fuse F, and a fifth controllable switch S5. The first end of the controllable fuse F is adapted to connect to the first pole of the battery 30. The second end of the controllable fuse F is connected to the first end of the first switch unit Q1. The third end of the controllable fuse F is connected to the first end of the fifth controllable switch S5. The second end of the fifth controllable switch S5 is grounded to AGND. The control terminal of the fifth controllable switch S5 is connected to the control pin of the third control sub-circuit 23. The first end of the second resistor R2 is connected to the third end of the controllable fuse F. The second end of the second resistor R2 is connected to the first end of the fifth controllable switch S5. The third resistor R3 is connected in parallel with the second resistor R2.

[0094] Among them, the controllable fuse F, together with the second resistor R2 and the third resistor R3, forms a three-terminal fuse.

[0095] Specifically, see Figure 9 , Figure 10 While the battery 30 is protected by the first control sub-circuit 21 and the first switch unit Q1, the third control sub-circuit 23 can control the fifth controllable switch S5 to be turned on when it detects that the voltage of the battery 30 is too high (the threshold for judging the excessive voltage can be greater than the overcharge protection threshold in the first control sub-circuit 21). The first terminal of the battery 30, the controllable fuse F and the ground AGND form a circuit, causing the controllable fuse F to blow, thereby disconnecting the power supply connection between the battery 30 and the terminal 200.

[0096] It should be noted that the first switch unit Q1, the second switch unit Q2, and the controllable fuse unit 111 can coexist, thereby achieving three levels of protection for the battery 30.

[0097] For example, see Figure 9 The controllable fuse unit 111 further includes at least one of a first capacitor C1, a second capacitor C2, and a fourth resistor R4. The first terminal of the first capacitor C1 is connected to the first terminal of the fifth controllable switch S5, the second terminal of the first capacitor C1 is connected to the second terminal of the fifth controllable switch S5, the first terminal of the second capacitor C2 is connected to the control terminal of the fifth controllable switch S5, the second terminal of the second capacitor C2 is grounded to AGND, and the fourth resistor R4 is connected in parallel with the second capacitor C2.

[0098] The controllable switches described above have the same structure, including a switching transistor and an anti-parallel diode. Each switching transistor can be a MOS (Metal-Oxide-Semiconductor Field-Effect Transistor), which has the characteristics of small package size, low resistance, and easy control.

[0099] By connecting the first capacitor C1 between the first and second terminals of the fifth controllable switch S5, the surge current that may be generated when the switching transistor in the fifth controllable switch S5 is turned on can be reduced, and the spatial electromagnetic interference that may be induced in the gate circuit of the switching transistor can be suppressed to prevent the switching transistor from being mis-turned on. By connecting the second capacitor C2 and the fourth resistor R4 between the second terminal and the control terminal of the fifth controllable switch S5, the control signal input to the fifth controllable switch S5 can be filtered, improving the stability of the operation of the fifth controllable switch S5. By connecting the second resistor R2 and the third resistor R3 between the control terminal of the controllable fuse F and the first terminal of the fifth controllable switch S5, current limiting and voltage division can be achieved, ensuring the safe and reliable control of the controllable fuse F. The first capacitor C1, the second resistor R2, the third resistor R3, the second capacitor C2, and the fourth resistor R4 can be selected according to the needs.

[0100] In some embodiments of this utility model, see Figure 3. Figure 5 , Figure 8 , Figure 10 The first control sub-circuit 21 also includes a current sensing resistor RS1, a sixth resistor R6 and a seventh resistor R7. The first current sensing pin ISENS0 of the first protection chip U1 is connected to the first end of the current sensing resistor RS1 through the sixth resistor R6. The second current sensing pin ISENS1 of the first protection chip U1 is connected to the second end of the current sensing resistor RS1 through the seventh resistor R7. The first end of the current sensing resistor RS1 is adapted to be connected to the second end of the first switching unit Q1. The second end of the current sensing resistor RS1 is adapted to be connected to the first power supply end of the load 40.

[0101] Specifically, RS1 can be used to detect current. When battery 30 discharges or charges at a high current, a large voltage drop will be generated in the current sensing resistor RS1 (serving as overcurrent protection). If a positive voltage value is detected between the current sensing pins ISENSO and ISENS1, which is greater than the first preset threshold and lasts for a certain period of time, the DSG pin will output a low level, the discharge switch will be turned off, and the battery 30 will be prevented from continuously discharging at a high current. The time for the high current to reach the threshold can be greater than the time threshold for a short circuit, effectively protecting the battery 30 from damage caused by high current discharge. If a negative voltage value is detected between the current sensing pins ISENSO and ISENS1, which is greater than the first preset threshold and lasts for a certain period of time, the CHG pin will output a low level, the charging switch will be turned off, and the battery 30 will be prevented from continuously charging at a high current. The time for the high current to reach the threshold can be greater than the time threshold for a short circuit, effectively protecting the battery 30 from damage caused by high current charging.

[0102] Alternatively, the sixth resistor R6 and the seventh resistor R7 may not be provided.

[0103] It should be noted that regardless of whether the sixth resistor R6 and the seventh resistor R7 are set, a large voltage drop will occur in the current sensing resistor RS1 when the battery discharges or charges at a high current of 30V. Whether to set the sixth resistor R6 and the seventh resistor R7 can be determined according to the selection of the first protection chip U1. For example, if the voltage drop of the current sensing resistor RS1 exceeds the input range of the first protection chip U1, then the sixth resistor R6 and the seventh resistor R7 need to be set so that the first protection chip U1 can accurately detect the voltage drop.

[0104] Similarly, see Figure 8 The second control sub-circuit 22 also includes resistors RS1', R6' and R7', and the third control sub-circuit 23 also includes resistors RS1', R6' and R7'.

[0105] Figure 11 This is a structural block diagram of the battery module according to an embodiment of the present utility model.

[0106] like Figure 11 As shown, the battery module 100 includes a battery 30 and a protection circuit 10 as described in the above embodiment.

[0107] Corresponding to the control circuit of the above embodiments, this utility model proposes a terminal.

[0108] In this embodiment, such as Figure 12 As shown, the terminal 200 includes a control circuit 20 and a load 40. The control circuit 20 is adapted to connect to the switch sub-circuit 11 in the protection circuit 10. The control circuit 20 is configured to control the switch sub-circuit 11 to at least disconnect or establish a power supply connection between the battery 30 and the load 40.

[0109] In some embodiments of this utility model, such as Figure 2 As shown, the switch sub-circuit 11 includes a first switch unit Q1, the first end of the first switch unit Q1 is adapted to connect to the first pole of the battery 30, and the second end of the first switch unit Q1 is adapted to connect to at least the first power supply terminal of the load 40.

[0110] As shown in Figure 3, the control circuit 20 includes a first control sub-circuit 21, and the control pins of the first control sub-circuit 21 are adapted to connect to the control terminal of the first switching unit Q1.

[0111] In some embodiments of this utility model, as shown in Figure 3, Figure 5As shown, the first control sub-circuit 21 includes a first protection chip U1, a third capacitor C3, and a fifth resistor R5. The second power supply terminal of the first protection chip U1 is connected to the first terminal of the third capacitor C3 and is adapted to connect to the second terminal of the battery 30. The first power supply terminal of the first protection chip U1 is connected to the second terminal of the third capacitor C3 and the first terminal of the fifth resistor R5, respectively. The second terminal of the fifth resistor R5 is adapted to connect to the second terminal of the first switching unit Q1 (see Figure 3), or, adapted to connect to the second terminal of the current limiting sub-circuit 12 in the protection circuit 10 (see Figure 4). Figure 5 The control pin of the first protection chip U1 is adapted to connect to the control terminal of the first switching unit Q1.

[0112] In some embodiments of this utility model, such as Figure 6 As shown, the first control sub-circuit 21 also includes a sixth controllable switch S6. The first end of the sixth controllable switch S6 is connected to the second end of the fifth resistor R5. The second end of the sixth controllable switch S6 is adapted to connect to the second end of the current limiting sub-circuit 12 in the protection circuit 10.

[0113] In some embodiments of this utility model, see Figure 3. Figure 5 , Figure 6 The first control sub-circuit 21 also includes a current sensing resistor RS1, a sixth resistor R6 and a seventh resistor R7. The first current sensing pin of the first protection chip U1 is connected to the first end of the current sensing resistor RS1 through the sixth resistor R6. The second current sensing pin of the first protection chip U1 is connected to the second end of the current sensing resistor RS1 through the seventh resistor R7. The first end of the current sensing resistor RS1 is adapted to be connected to the second end of the first switching unit Q1. The second end of the current sensing resistor RS1 is adapted to be connected to the first power supply end of the load 40.

[0114] In some embodiments of this utility model, such as Figure 7 As shown, the switch sub-circuit 11 also includes at least one second switch unit Q2, which is connected in series with the first switch unit Q1.

[0115] Among them, such as Figure 8 As shown, the control circuit 20 includes at least one second control sub-circuit 22 corresponding to at least one second switching unit, and the control pins of the second control sub-circuit 22 are adapted to connect to the control terminal of the corresponding second switching unit Q2.

[0116] For example, see Figure 8 The second control sub-circuit 22 has the same structure as the first control sub-circuit 21.

[0117] In some embodiments of this utility model, such as Figure 9As shown, the switch sub-circuit 11 also includes a controllable fuse unit 111. The first end of the controllable fuse unit 111 is adapted to be connected to the first pole of the battery 30, and the second end of the controllable fuse unit 111 is connected to the first end of the first switch unit Q1.

[0118] Among them, such as Figure 10 As shown, the control circuit 20 includes a third control sub-circuit 23, and the control pins of the third control sub-circuit 23 are adapted to connect to the control terminal of the controllable fuse unit 111.

[0119] In some embodiments of this utility model, see Figure 2 The terminal 200 also includes an activation circuit 60, which includes an activation power supply 61 connected to the power supply terminal of the control circuit 20.

[0120] For example, the activation power supply 61 includes at least one of a photovoltaic power supply, a piezoelectric power supply, and a thermoelectric power supply; wherein, when the activation power supply 61 includes a photovoltaic power supply, the activation circuit 60 further includes an activation switch, which is connected between the photovoltaic power supply and the power supply terminal of the control circuit 20.

[0121] It should be noted that for other specific implementations of the control circuit 20 in this application embodiment, please refer to the description of the specific implementation of the control circuit 20 in the protection device 1 of the above embodiment.

[0122] Figure 13 This is a structural block diagram of the electronic device according to an embodiment of the present invention.

[0123] like Figure 13 As shown, the electronic device 1000 includes a battery module 100 and a terminal 200.

[0124] The protection device, battery module, terminal, and electronic device of this utility model embodiment mainly feature a switch in the protection circuit of the battery module, while the control circuit is located in the terminal. When the battery module is not connected to the terminal, the switch in the protection circuit is normally open, ensuring the battery module does not discharge during turnover, thus guaranteeing its absolute safety and extending its lifespan during storage. Furthermore, by reducing the number of protection chip components in the protection circuit and placing the protection chip on the terminal's motherboard for system-level arrangement, space utilization is higher, providing more space for the battery module to increase capacity and extend the terminal's operating time. Additionally, after the battery module is assembled with the terminal, it completely disconnects from the terminal after over-discharge, significantly reducing power consumption and increasing the battery module's lifespan in low-charge states.

[0125] It should be noted that the aforementioned protection chip can be implemented in hardware, such as an arithmetic unit, or in software.

[0126] It should be understood that the various parts of this utility model can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0127] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," 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, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0128] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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.

[0129] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0130] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0131] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0132] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A protection device (1) characterized in that, include: The protection circuit (10) includes a switch sub-circuit (11), and the control circuit (20) is disposed in the terminal (200). The switch sub-circuit (11) is connected to the control circuit (20) and adapted to connect a battery (30) and a load (40) in the terminal (200). The switch sub-circuit (11) is configured to, under the control of the control circuit (20), at least disconnect or establish a power supply connection between the battery (30) and the load (40).

2. Protection device (1) according to claim 1, characterized in that The switching sub-circuit (11) includes a first switching unit (Q1), the first end of which is adapted to be connected to the first pole of the battery (30), the second end of which is adapted to be connected to at least the first power supply terminal of the load (40), and the control terminal of which is adapted to be connected to the control pin of the first control sub-circuit (21) in the control circuit (20).

3. Protection device (1) according to claim 2, characterized in that The first switch unit (Q1) includes a first controllable switch (S1) and a second controllable switch (S2). The first end of the first controllable switch (S1) is adapted to connect to the first pole of the battery (30). The second end of the first controllable switch (S1) is connected to the first end of the second controllable switch (S2). The second end of the second controllable switch (S2) is adapted to connect to at least the first power supply terminal of the load (40). The control end of the first controllable switch (S1) is adapted to connect to the first control pin of the first control sub-circuit (21). The control end of the second controllable switch (S2) is adapted to connect to the second control pin of the first control sub-circuit (21).

4. Protection device (1) according to claim 2, characterized in that The second end of the first switching unit (Q1) is also adapted to be connected to the first power supply end of the control circuit (20).

5. Protection device (1) according to claim 2, characterized in that The protection circuit (10) further includes a current limiting sub-circuit (12), the first end of which is adapted to be connected to the battery (30), and the second end of which is adapted to be connected to the power supply terminal of the control circuit (20).

6. Protection device (1) according to claim 5, characterized in that The current limiting sub-circuit (12) includes a first resistor (R1), the first end of which is adapted to be connected to the first or second terminal of the battery (30), and the second end of which is adapted to be connected to the first or second power supply terminal of the control circuit (20).

7. Protection device (1) according to claim 6, characterized in that The current limiting sub-circuit (12) further includes a current limiting switch (Qx), which is connected in series with the first resistor (R1), and the control terminal of the current limiting switch (Qx) is adapted to be connected to the control pin of the first control sub-circuit (21).

8. Protection device (1) according to any one of claims 2-7, characterized in that The switching sub-circuit (11) further includes at least one second switching unit (Q2), which is connected in series with the first switching unit (Q1). The control unit (20) includes at least one second control sub-circuit (22). The second control sub-circuit (22) is correspondingly arranged with the second switching unit (Q2), and the control terminal of the second switching unit (Q2) is adapted to be connected to the control pin of the second control sub-circuit (22).

9. Protection device (1) according to claim 8, characterized in that The structure of the second switching unit (Q2) is the same as that of the first switching unit (Q1).

10. Protection device (1) according to any one of claims 2-7, characterized in that The switch sub-circuit (11) further includes a controllable fuse unit (111), which is connected in series with the first switch unit (Q1). The control terminal of the controllable fuse unit (111) is adapted to connect to the control pin of the third control sub-circuit (23) in the control circuit (20).

11. Protection device (1) according to claim 10, characterized in that The controllable fuse unit (111) includes: a second resistor (R2), a third resistor (R3), a controllable fuse (F), and a fifth controllable switch (S5). The first end of the controllable fuse (F) is adapted to connect to the first pole of the battery (30). The second end of the controllable fuse (F) is connected to the first end of the first switch unit (Q1). The third end of the controllable fuse (F) is connected to the first end of the fifth controllable switch (S5). The second end of the fifth controllable switch (S5) is grounded (AGND). The control end of the fifth controllable switch (S5) is adapted to connect to the control pin of the third control sub-circuit (23). The first end of the second resistor (R2) is connected to the third end of the controllable fuse (F). The second end of the second resistor (R2) is connected to the first end of the fifth controllable switch (S5). The third resistor (R3) is connected in parallel with the second resistor (R2).

12. Protection device (1) according to claim 11, characterized in that The controllable fuse unit (111) further includes at least one of a first capacitor (C1), a second capacitor (C2), and a fourth resistor (R4); The first terminal of the first capacitor (C1) is connected to the first terminal of the fifth controllable switch (S5), and the second terminal of the first capacitor (C1) is connected to the second terminal of the fifth controllable switch (S5). The first terminal of the second capacitor (C2) is connected to the control terminal of the fifth controllable switch (S5), and the second terminal of the second capacitor (C2) is grounded (AGND). The first end of the fourth resistor (R4) is connected to the control terminal of the fifth controllable switch (S5), and the second end of the fourth resistor (R4) is grounded (AGND).

13. Protection device (1) according to any one of claims 2-7, characterized in that The protection circuit (10) further includes a first connecting line L1, the first end of which is adapted to connect to the second pole of the battery (30), and the second end of which is adapted to connect to at least the second power supply terminal of the load (40).

14. Protection device (1) according to claim 13, characterized in that The protection circuit (10) further includes a second connecting line L2, the first end of which is adapted to connect to the second pole of the battery (30), and the second end of which is adapted to connect to the second power supply terminal of the control circuit (20).

15. A battery module (100), characterized in that include: The battery (30) and the protection circuit (10) in the protection device (1) according to any one of claims 1-14.

16. A terminal (200), characterized by include: A control circuit (20) and a load (40), the control circuit (20) being adapted to connect to the protection circuit (10) in the protection device (1) according to any one of claims 1-14, and being configured to control the switching sub-circuit (11) in the protection circuit (10) to at least disconnect or establish a power supply connection between the battery (30) and the load (40).

17. The terminal (200) according to claim 16, characterized by The switching sub-circuit (11) includes a first switching unit (Q1), a first end of the first switching unit (Q1) is adapted to connect to the first pole of the battery (30), and a second end of the first switching unit (Q1) is adapted to connect to at least the first power supply terminal of the load (40). The control circuit (20) includes a first control sub-circuit (21), and the control pins of the first control sub-circuit (21) are adapted to be connected to the control terminal of the first switching unit (Q1).

18. The terminal (200) according to claim 17, characterized by The first control sub-circuit (21) includes a first protection chip (U1), the second power supply terminal of the first protection chip (U1) is adapted to be connected to the second pole of the battery (30), the first power supply terminal of the first protection chip (U1) is adapted to be connected to the second terminal of the first switching unit (Q1), or, adapted to be connected to the second terminal of the current limiting sub-circuit (12) in the protection circuit (10), and the control pin of the first protection chip (U1) is adapted to be connected to the control terminal of the first switching unit (Q1).

19. The terminal (200) according to claim 18, characterized by The first control sub-circuit (21) also includes a third capacitor (C3) and a fifth resistor (R5); The first end of the third capacitor (C3) is connected to the second power supply terminal of the first protection chip (U1) and is adapted to be connected to the second pole of the battery (30). The second end of the third capacitor (C3) is connected to the first power supply terminal of the first protection chip (U1) and the first end of the fifth resistor (R5) respectively. The second end of the fifth resistor (R5) is adapted to be connected to the second end of the first switching unit (Q1) or to be connected to the second end of the current limiting sub-circuit (12) in the protection circuit (10).

20. The terminal (200) according to claim 18, characterized by The first control sub-circuit (21) further includes a sixth controllable switch (S6), the first end of which is connected to the first power supply terminal of the first protection chip (U1), and the second end of which is adapted to be connected to the second end of the current limiting sub-circuit (12) in the protection circuit (10).

21. The terminal (200) according to claim 19, characterized by The first control sub-circuit (21) further includes a current sensing resistor (RS1), the first current sensing pin of the first protection chip (U1) is connected to the first end of the current sensing resistor (RS1), the second current sensing pin of the first protection chip (U1) is connected to the second end of the current sensing resistor (RS1), the first end of the current sensing resistor (RS1) is adapted to be connected to the second end of the first switching unit (Q1), and the second end of the current sensing resistor (RS1) is adapted to be connected to the first power supply end of the load (40).

22. The terminal (200) according to claim 20, characterized by The first control sub-circuit (21) further includes a sixth resistor (R6) and a seventh resistor (R7). The sixth resistor (R6) is connected between the first current detection pin of the first protection chip (U1) and the first end of the current detection resistor (RS1). The seventh resistor (R7) is connected between the second current detection pin of the first protection chip (U1) and the second end of the current detection resistor (RS1).

23. The terminal (200) according to claim 18, characterized by The switching sub-circuit (11) further includes at least one second switching unit (Q2), and at least one second switching unit (Q2) is connected in parallel or in series with the first switching unit (Q1); The control circuit (20) includes at least one second control sub-circuit (22) corresponding to at least one second switch unit (Q2), and the control pin of the second control sub-circuit (22) is adapted to connect to the control terminal of the corresponding second switch unit (Q2).

24. The terminal (200) according to claim 23, characterized by The second control sub-circuit (22) has the same structure as the first control sub-circuit (21).

25. The terminal (200) according to claim 19, characterized by The switch sub-circuit (11) further includes a controllable fuse unit (111), the first end of which is adapted to be connected to the first pole of the battery (30), and the second end of which is connected to the first end of the first switch unit (Q1). The control circuit (20) includes a third control sub-circuit (23), and the control pins of the third control sub-circuit (23) are adapted to connect to the control terminal of the controllable fuse unit (111).

26. The terminal (200) according to any of claims 17-25, characterized by, The terminal (200) also includes: An activation circuit, comprising an activation power supply, wherein the activation power supply is connected to the power supply terminal of the control circuit (20).

27. The terminal (200) according to claim 26, characterized by The activation power source includes at least one of photovoltaic power source, piezoelectric power source, and thermoelectric power source. When the activation power source includes the photovoltaic power source, the activation circuit also includes an activation switch, which is connected between the photovoltaic power source and the power supply terminal of the control circuit (20).

28. An electronic device (1000), characterized by: include: The battery module (100) according to claim 15 and the terminal (200) according to any one of claims 16-27.

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