Battery pack and electronic equipment

Abstract

The invention relates to the technical field of power supplies, in particular to a battery pack and electronic equipment, and the battery pack comprises a battery cell module and a battery control circuit electrically connected with the battery cell module; the port module is used for being connected with a load in an inserted mode, a port positive electrode pin of the port module is connected with a battery positive electrode pin of the battery cell module, and a port grounding pin of the port module is electrically connected with a battery negative electrode pin of the battery cell module based on a load grounding pin of the load; the switch module is connected between the battery control circuit and the port grounding pin of the port module, and when the port grounding pin is disconnected from the load grounding pin of the load, the switch module responds to the suspension state of the port grounding pin to enter a switch cut-off state; therefore, a target loop formed by the cell module, the load, the port module and the battery control circuit is cut off. And at the moment, the voltage output by the battery cell module can be prevented from flowing back to the battery control circuit through the switch module, so that the stability of the battery pack is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power supplies, and in particular to a battery pack and electronic equipment. Background Art

[0002] With the rapid development of the drone industry, the number, voltage and current of the battery packs carried by drones are increasing, providing drones with sufficient power to meet the flight needs of drones. As the number of battery packs increases, communication problems with high-voltage batteries also arise, especially during hot-swap operations. If the negative pole is disconnected first, the high voltage generated instantly will surge to the communication port, causing serious damage to the components inside the battery. Summary of the invention

[0003] The embodiments of the present invention provide a battery pack and an electronic device, aiming to solve the technical problem in the related art that high voltage is easily backflowed into the battery during hot plugging and thus damaging the internal components of the battery.

[0004] In order to solve the above technical problems, a technical solution adopted in the embodiment of the present invention is: to provide a battery pack, comprising:

[0005] A battery cell module, including a positive battery pin and a negative battery pin;

[0006] A port module, used for plugging with a load, wherein the port module comprises a port positive pin and a port ground pin, the port positive pin is electrically connected to the battery positive pin, the load comprises a load positive pin and a load ground pin, the port ground pin is electrically connected to the battery negative pin based on the load ground pin;

[0007] A battery control circuit, electrically connected to the battery module;

[0008] A switch module is electrically connected between the battery control circuit and the port module and is also electrically connected to the port ground pin. When the port positive pin is electrically connected to the load positive pin but the port ground pin is disconnected from the load ground pin, the switch module enters a switch cut-off state in response to the suspended state of the port ground pin to cut off the target loop formed by the battery cell module, the load, the port module and the battery control circuit.

[0009] Optionally, the port module further includes a port communication pin, the load further includes a load communication pin, the battery control circuit includes a battery communication pin, and the switch module is electrically connected between the battery communication pin and the port communication pin;

[0010] When the positive pin of the port is electrically connected to the positive pin of the load, the port communication pin is electrically connected to the load communication pin, and the port ground pin is electrically connected to the load ground pin, the switch module enters the switch-on state in response to the grounding state of the port ground pin, and the battery control circuit transmits communication data to the switch module based on the battery communication pin when the switch module enters the switch-on state, so that the switch module forwards the communication data to the load based on the port communication pin.

[0011] Optionally, the target circuit is a circuit formed by the battery positive pin, the port positive pin, the load positive pin, the port communication pin, the switch module and the battery control circuit.

[0012] Optionally, the switch module includes:

[0013] a switch unit, electrically connected between the battery communication pin and the port communication pin;

[0014] A switch control circuit is electrically connected to the port ground pin and also electrically connected to the switch unit, and is used to respond to the floating state of the port ground pin to control the switch unit to enter a switch-off state, or respond to the grounding state of the port ground pin to control the switch unit to enter a switch-on state.

[0015] Optionally, the battery communication pin includes a battery communication receiving pin and a battery communication sending pin, and the port communication pin includes a port communication receiving pin and a port communication sending pin;

[0016] The switch unit comprises a first switch circuit and a second switch circuit which are electrically connected to a preset control node, the first switch circuit is electrically connected between the battery communication receiving pin and the port communication receiving pin, the second switch circuit is electrically connected between the battery communication sending pin and the port communication sending pin, and the switch control circuit is electrically connected to the preset control node;

[0017] The switch control circuit responds to the floating state of the port ground pin to control the first switch circuit and the second switch circuit to enter the switch-off state, or the switch control circuit responds to the grounding state of the port ground pin to control the first switch circuit and the second switch circuit to enter the switch-on state.

[0018] Optionally, the first switch circuit includes a first switch tube and a second switch tube, the first switch tube and the second switch tube are connected in series between the battery communication receiving pin and the port communication receiving pin and are electrically connected to the switch control circuit at the preset control node respectively; and / or,

[0019] The second switch circuit includes a third switch tube and a fourth switch tube, and the third switch tube and the fourth switch tube are connected in series between the battery communication sending pin and the port communication sending pin and are electrically connected to the switch control circuit at the preset control node.

[0020] Optionally, the switch control circuit includes a fifth switch tube, which is electrically connected to the port ground pin and electrically connected to the preset control node, and is used to respond to the floating state of the port ground pin, enter the switch cut-off state to lower the voltage of the preset control node, so that the switch unit enters the switch cut-off state, or, respond to the grounding state of the port ground pin, enter the switch on state to raise the voltage of the preset control node, so that the switch unit enters the switch on state.

[0021] Optionally, the battery control circuit includes:

[0022] A battery management chip, electrically connected to the battery module;

[0023] A signal acquisition circuit, electrically connected to the battery management chip, for collecting environmental data of the battery module;

[0024] The controller is electrically connected to the battery management chip. The controller is provided with a battery communication pin. The controller is electrically connected to the switch module based on the battery communication pin.

[0025] Optionally, the signal acquisition circuit includes:

[0026] A temperature detection circuit, electrically connected to the battery management chip, for detecting the temperature of the battery module;

[0027] A current detection circuit is electrically connected to the negative electrode pin of the battery and to the battery management chip, and is used to detect current data of the battery cell module.

[0028] In order to solve the above technical problems, another technical solution adopted in the embodiment of the present invention is: to provide an electronic device, comprising:

[0029] load; and

[0030] A battery pack as described above.

[0031] Different from the related art, the present invention provides a battery pack and an electronic device, wherein the battery pack includes a battery cell module, including a battery positive pin and a battery negative pin; a battery control circuit, electrically connected to the battery cell module; a port module, used to be plugged into a load, including a port positive pin and a port grounding pin, the port positive pin is electrically connected to the battery positive pin, the load includes a load positive pin and a load grounding pin, the port grounding pin is electrically connected to the battery negative pin based on the load grounding pin; a switch module, electrically connected between the battery control circuit and the port module and also electrically connected to the port grounding pin, when the port positive pin is electrically connected to the load positive pin, but the port grounding pin is disconnected from the load grounding pin, the switch module enters a switch cut-off state in response to the suspended state of the port grounding pin, so as to cut off the target loop formed by the battery cell module, the load, the port module and the battery control circuit. At this time, when the battery cell module outputs voltage to the port module, the voltage will be isolated by the switch module, thereby preventing the voltage output by the battery cell module from flowing back into the battery control circuit, thereby improving the stability of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] One or more embodiments are exemplarily described by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and the figures in the drawings do not constitute proportional limitations unless otherwise stated.

[0033] Figure 1 is a structural block diagram of an electronic device provided by an embodiment of the present invention;

[0034] Figure 2 is a structural block diagram of a battery pack provided by an embodiment of the present invention;

[0035] Figure 3 is a structural block diagram of a switch module provided by an embodiment of the present invention;

[0036] Figure 4 is a circuit diagram of a battery pack provided by an embodiment of the present invention;

[0037] Figure 5 It is a structural block diagram of a battery management circuit provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0039] It should be noted that, if there is no conflict, the various features in the embodiments of the present invention can be combined with each other, and all are within the protection scope of the present invention. In addition, although the functional modules are divided in the device schematic diagram and the logical order is shown in the flow chart, in some cases, the steps shown or described can be performed in a different order from the module division in the device schematic diagram or the order in the flow chart.

[0040] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0041] At present, when a battery pack is needed to power a load, the battery pack is plugged into the load. At this time, the positive port of the battery pack, the load and the negative port form a power supply circuit, and the battery pack powers the load based on the power supply circuit. While powering the load, the battery pack communicates with the load based on the communication port to determine information such as the power supply voltage of the load.

[0042] However, when the battery pack is supplying power to the load, the battery pack may be hot-plugged. At this time, if the negative port of the battery pack is disconnected from the load first or the positive port of the battery pack is connected to the load first, the positive port of the battery pack, the load and the communication port will form a loop, so that the high voltage output by the positive port of the battery pack will be fed back to the battery pack through the communication port, thereby damaging the battery pack.

[0043] Therefore, in order to solve the above technical problems, the related technology sets a Zener diode in the battery pack, the cathode of the Zener diode is connected to the communication port, and the anode of the Zener diode serves as the voltage output terminal.

[0044] When the battery pack is hot-plugged and the negative port is disconnected first or the positive port is connected first, the high voltage output from the positive port of the battery pack will be input to the cathode of the voltage regulator tube, thereby suppressing the high voltage output from the positive port through the voltage regulation characteristics of the voltage regulator tube. However, when the positive port outputs a continuous high voltage, the voltage regulator tube will be broken down by the continuous high voltage, so that the high voltage is input to the battery pack through the voltage regulator tube, thereby damaging the battery pack.

[0045] Alternatively, the related technology customizes a terminal that contacts the negative electrode first through mold customization, but the applicability of mold customization is low, different terminals need to be designed for different products, and the customization cycle is too long, which leads to an increase in the cost of the battery pack.

[0046] Based on this, the embodiment of the present application sets a switch module on the communication loop between the battery pack and the load, so that the battery pack can only communicate and interact with the load through the switch module. In addition, the switch module is configured so that when the negative port of the load is connected to the switch module, the switch module will transmit the data output by the battery pack / load, so that when the negative port of the battery pack is disconnected from the load first or the positive port of the battery pack is connected to the load first, the communication connection between the battery pack and the load is disconnected through the switch module, and the high voltage output from the positive port is isolated, thereby ensuring that the high voltage will not be fed back to the battery pack, thereby increasing the service life of the battery pack.

[0047] Hereinafter, the present application provides a battery pack, which can be applied to electronic devices. Figure 1 , Figure 1 is a structural block diagram of an electronic device provided by an embodiment of the present invention, such as Figure 1 As shown, the electronic device 1 includes a battery pack 100 and a load 200 , wherein the battery pack 100 is used to be plugged into the load 200 , and when plugged into the load 200 , outputs a supply voltage to the load 200 to power the load 200 .

[0048] In some embodiments, when the load 200 is an electrical device, such as a drone, a model car, a remote-controlled aircraft, an electric wrench, etc., the battery pack 100 is used to output voltage to the electrical device to power the electrical device.

[0049] In another embodiment, when the load 200 is a charging device, such as an energy storage power source, a photovoltaic input source, etc., the battery pack 100 is used to receive the electrical energy input by the load 200 and convert the electrical energy into chemical energy for storage.

[0050] Please refer to Figure 2 , Figure 2 is a structural block diagram of a battery pack provided by an embodiment of the present invention, such as Figure 2 As shown, the battery pack 100 includes a battery cell module 10, a battery control circuit 20, a port module 30 and a switch module 40;

[0051] The battery cell module 10 includes a battery negative electrode pin N1 and a battery positive electrode pin N2;

[0052] In some embodiments, Figure 2 As shown, the battery module 10 includes a charge and discharge circuit 11 and a plurality of battery cells 12 . The charge and discharge circuit 11 is connected to the plurality of battery cells 12 . The charge and discharge circuit 11 is also connected to the battery control circuit 20 .

[0053] The charging and discharging circuit 11 is used to receive the driving signal output by the battery control circuit 20, and control the charging or discharging of the plurality of battery cells 12 based on the driving signal. When the plurality of battery cells are charging, the charging and discharging circuit 11 receives the external input electric energy, and inputs the electric energy into the plurality of battery cells 12, so that the plurality of battery cells convert the electric energy into chemical energy for storage; or when discharging, receives the converted electric energy output by the plurality of battery cells 12, and outputs the electric energy to the load 200, thereby supplying power to the load 200.

[0054] Each of the plurality of battery cells 12 is connected in series. When the plurality of battery cells 12 are in a charging state, the plurality of battery cells 12 are charged synchronously to avoid overcharging or undervoltage of the battery cells; and when the plurality of battery cells 12 are in a discharging state, the plurality of battery cells 12 are discharged synchronously to provide stable current and voltage.

[0055] The battery control circuit 20 is electrically connected to the battery cell module 10 .

[0056] The port module 30 includes a port positive pin M1 and a port ground pin M3 for plugging into the load 200. The port positive pin M1 is electrically connected to the battery positive pin N2. The load 200 includes a load positive pin L2 and a load ground pin L1. The port ground pin M3 is electrically connected to the battery negative pin N1 based on the load ground pin L1.

[0057] The switch module 40 is electrically connected between the battery control circuit 20 and the port module 30 and is also electrically connected to the port ground pin M3. When the port positive pin M1 is electrically connected to the load positive pin L2, but the port ground pin M3 is disconnected from the load ground pin L1, the switch module 40 enters a switch cut-off state in response to the suspended state of the port ground pin M3, so as to cut off the target loop formed by the battery cell module 10, the load 200, the port module 30 and the battery control circuit 20.

[0058] It can be known that during the plugging process between the port module 30 and the load 200, after the port positive pin M1 is electrically connected to the load positive pin L2, if the battery module 10 is in a discharge state (battery pack hot plug), the voltage of the battery module 10 will flow into the port positive pin M1 through the battery positive pin N2. At this time, if the port ground pin M3 is electrically connected to the load ground pin L1, the battery positive pin N2, the port positive pin M1, the load 200 and the port ground pin M3 form a power supply circuit to provide the load 200 with a working voltage; at the same time, the port ground pin M3 will also be electrically connected to the battery negative pin N1 through the load ground pin L1, so that the switch module 40 starts working based on the grounding state of the port ground pin M3. When the switch module 40 starts working, the battery pack 100 and the load 200 will communicate and interact based on the switch module 40. If the port ground pin M3 is disconnected from the load ground pin L1, the voltage stored in the port module 30 cannot be discharged through the battery negative pin N1, resulting in the voltage stored in the port module 30 possibly flowing back to the battery control circuit 20 through the target loop. Once the voltage output by the battery cell module 10 exceeds the maximum withstand voltage of the battery control circuit 20, the battery control circuit 20 will be damaged, thereby reducing the stability of the battery pack 100. It can be understood that the hot pull process of the battery pack is similar to the principle of the hot plug process described above, and will not be repeated in this embodiment.

[0059] Therefore, the embodiment of the present application configures the switch module 40 to enter the switch cut-off state when the port ground pin M3 is suspended, so that the target loop is cut off. Based on this, even if there is high voltage in the port module 30, the high voltage will be isolated by the switch module 40, preventing the high voltage in the port module 30 from flowing back to the battery control circuit 20 through the target loop, thereby improving the stability of the battery pack.

[0060] Furthermore, in some embodiments, Figure 2 As shown, the port module 30 further includes a port communication pin M2, the load 200 further includes a load communication pin L3, the battery control circuit 20 includes a battery communication pin M4, and the switch module 40 is electrically connected between the battery communication pin M4 and the port communication pin M2;

[0061] When the port positive pin M1 is electrically connected to the load positive pin L2, the port communication pin M2 is electrically connected to the load communication pin L3, and the port ground pin M3 is electrically connected to the load ground pin L1, the switch module 40 enters the switch-on state in response to the grounding state of the port ground pin M3, and the battery control circuit 20 transmits communication data to the switch module 40 based on the battery communication pin M4 when the switch module 40 enters the switch-on state, so that the switch module 40 forwards the communication data to the load 200 based on the port communication pin M2.

[0062] It can be understood that the target circuit is a circuit formed by the battery positive pin N2, the port positive pin M1, the load positive pin L2, the port communication pin M2, the switch module 40 and the battery control circuit 20.

[0063] Specifically, when the battery control circuit 20 is connected to the battery module 10, the battery control circuit 20 is used to output a discharge signal to the battery module 10 so that the battery module 10 starts to discharge. After the battery module 10 is discharged, the battery control circuit 20 is also used to obtain the working data (output voltage, output current, etc.) of the battery module 10, and transmit the working data to the switch module 40 through the battery communication pin M4. At this time, if the port module 30 is plugged into the load 200 (i.e., hot plugged) and the port positive pin M1 is electrically connected to the load positive pin L2, and the port ground pin M3 is electrically connected to the load ground pin L1, the switch module 40 will respond to the grounding state of the port ground pin M3 and enter the switch conduction state. When the switch module 40 is turned on, the battery control circuit 20, the battery communication pin M4, the switch module 40, the port communication pin M2, the load communication pin L3 and the load 200 form a communication loop. At this time, the switch module 40 can forward the working data to the load 200 based on the communication loop, so that the load 200 determines the current working data. After the load 200 obtains the current working data, if the current working data needs to be modified, the modified data will be sent to the port module 30 through the load communication pin L3. When the port module 30 receives the modified data, it will forward the modified data to the battery management circuit 20 based on the communication loop, so that the battery control circuit 20 modifies the output voltage and output current of the battery module 10 based on the modified data to meet the working requirements of the load 200. Based on this, the communication interaction between the battery control circuit 20 and the load 200 can be realized based on the communication loop. Among them, when the port ground pin M3 is connected to the load ground pin L1, the port ground pin M3 is connected to the battery negative pin N1, and the switch module 40 is connected to the battery negative pin N1, so that when the port ground pin M3 is electrically connected to the load ground pin L1, the switch can enter the on state.

[0064] In another embodiment, when the port ground pin M3 is disconnected from the load ground pin L1, the switch module 40 enters a switch cut-off state based on the floating state of the port ground pin M3, so that the communication loop is cut off, and the battery control circuit 20 stops communicating with the load 200. At the same time, when the communication loop is cut off, the target loop is also cut off, thereby prohibiting the high voltage in the port module 30 from flowing back to the battery control circuit 20, thereby preventing the components in the battery control circuit 20 from being damaged.

[0065] In some embodiments, see Figure 3, the switch module 40 includes a switch unit 41 and a switch control unit 42;

[0066] A switch unit 41, electrically connected between the battery communication pin M4 and the port communication pin M2;

[0067] The switch control circuit 42 is electrically connected to the port ground pin M3 and also electrically connected to the switch unit 41, and is used to respond to the suspended state of the port ground pin M3 to control the switch unit 41 to enter the switch cut-off state, or respond to the grounded state of the port ground pin M3 to control the switch unit 41 to enter the switch on state.

[0068] It can be understood that the switch unit 41 is used for communication interaction between the battery control circuit 20 and the load 200. When the port positive pin M1 is electrically connected to the load ground pin M2 and the port ground pin M3 is electrically connected to the load ground pin L1, the switch control circuit 42 will be connected to the battery negative pin N1 based on the port ground pin M3, so that the switch control circuit 42 controls the switch unit 41 to be turned on in response to the grounding state of the port ground pin M3. When the switch unit 41 is turned on, the switch unit 41, the battery communication pin M4, the battery control circuit 20, the port communication pin M2 and the load 200 form a communication loop, so that the battery control circuit 20 communicates and interacts with the load 200 based on the communication loop.

[0069] When the port ground pin M3 is disconnected from the load ground pin L1, regardless of whether the port positive pin M1 is electrically connected to the load positive pin L2, the switch control circuit 42 controls the switch unit 41 to enter the switch cut-off state based on the suspended state of the port ground pin M3. When the switch unit 41 enters the switch cut-off state, the communication loop is disconnected, thereby stopping the communication loop between the battery control circuit 20 and the load 200; at the same time, when the switch unit 41 enters the switch cut-off state, the target loop is also cut off, and the high voltage in the port module 30 will not flow back to the battery control circuit 20 through the target loop, thereby improving the stability of the battery pack 100.

[0070] In yet another embodiment, see Figure 3 , the battery communication pin M4 includes a battery communication receiving pin M4' and a battery communication sending pin M4", and the port communication pin M2 includes a port communication receiving pin M2' and a port communication sending pin M2";

[0071] The switch unit 41 includes a first switch circuit 411 and a second switch circuit 412 electrically connected to a preset control node G1, the first switch circuit 411 is electrically connected between the battery communication receiving pin M4' and the port communication receiving pin M2', the second switch circuit 412 is electrically connected between the battery communication sending pin M4" and the port communication sending pin M2", and the switch control circuit 42 is electrically connected to the preset control node G1;

[0072] The switch control circuit 42 responds to the floating state of the port ground pin M3 to control the first switch circuit 411 and the second switch circuit 412 to enter the switch-off state, or the switch control circuit 42 responds to the grounding state of the port ground pin M3 to control the first switch circuit 411 and the second switch circuit 412 to enter the switch-on state.

[0073] It can be known that when the port ground pin M3 is in the ground state, that is, when the port ground pin M3 is connected to the battery negative pin N1 through the load ground pin L1, the switch control circuit 42 controls the first switch circuit 411 and the second switch circuit 412 to enter the switch-on state. At this time, the battery control circuit 20, the battery communication receiving pin M4', the first switch circuit 411, the port communication receiving pin M2' and the load 200 form a communication receiving loop, and the battery control circuit 20 receives the data sent by the load 200 based on the communication receiving loop; the battery control circuit 20, the battery communication sending pin M4", the second switch circuit 412, the port communication sending pin M2" and the load 200 form a communication sending loop, and the battery control circuit 20 sends data to the load 200 based on the communication sending loop. Based on this, the communication interaction between the battery control circuit 20 and the load 200 can be realized based on the communication receiving loop and the communication sending loop.

[0074] Furthermore, when the port ground pin M3 is in a suspended state, the switch control circuit 42 controls the first switch circuit 411 and the second switch circuit 412 to enter a switch cut-off state. At this time, the communication transmission loop and the communication reception loop are both in a disconnected state, so that the battery control circuit 20 stops communicating with the load 200; at the same time, the target loop is also cut off, thereby improving the stability of the battery pack 100.

[0075] See also Figure 4In some embodiments, the port module 30 includes six pins, the first pin is the positive pin of the port, the second pin is connected to the first pin, and the sixth pin is connected to the negative pin N1 of the battery. The first pin and the sixth pin are mainly used to receive the voltage output by the battery cell module 10 to realize power supply for the load 200. The third pin is the port communication receiving pin, and the fourth pin is the port communication sending pin. When the load 200 communicates with the battery control circuit 20, the data output by the load 200 is forwarded through the third pin, and the data output by the battery tube circuit 20 is forwarded through the fourth pin. The fifth pin is the port grounding pin. When the port grounding pin is connected to the load grounding pin, the fifth pin and the sixth pin of the port module 30 are connected to each other, so that the port grounding pin is in a grounded state.

[0076] In yet another embodiment, see Figure 4 The first switch circuit 411 includes a first switch tube Q1 and a second switch tube Q2, and the second switch circuit 412 includes a third switch tube Q3 and a fourth switch tube Q4;

[0077] The first switch tube Q1 and the second switch tube Q2 are connected in series between the battery communication receiving pin M4' and the port communication receiving pin M2' and are electrically connected to the switch control circuit 42 at the preset control node G1 respectively;

[0078] The third switch tube Q3 and the fourth switch tube Q4 are connected in series between the battery communication sending pin M4 ″ and the port communication sending pin M2 ″ and are electrically connected to the switch control circuit 42 at the preset control node G1 .

[0079] Specifically, when the switch control circuit 42 controls the first switch circuit 411 and the second switch circuit 412 to be in the on state in response to the grounding state of the port ground pin M3, that is, the first switch tube Q1, the second switch tube Q2, the third switch tube Q3 and the fourth switch tube Q4 are all turned on, the data sent by the battery control circuit 20 is input to the third pin of the port module 30 through the switch tube Q3 and the switch tube Q4, so that the load 200 receives the data output by the battery control circuit 20. At the same time, the second switch tube Q2 and the first switch tube Q1 will also receive the data output by the load 200 through the fourth pin, and forward the output to the battery control circuit 20, so that the battery control circuit 20 receives the data output by the load 200.

[0080] Furthermore, when the first switch tube Q1, the second switch tube Q2, the third switch tube Q3 and the fourth switch tube Q4 are in the cut-off state, the communication loop between the battery control circuit 20 and the load 200 is also disconnected, so that the battery control circuit 20 and the load 200 stop communicating and interacting.

[0081] In some embodiments, Figure 4 As shown, the first switch tube Q1, the second switch tube Q2, the third switch tube Q3 and the fourth switch tube Q4 are NMOS tubes, and the source of the first switch tube Q1 is connected to the source of the fourth switch tube Q4, and the source of the third switch tube Q3 is connected to the source of the switch tube Q2. Based on this, when there is an abnormal voltage in the battery control circuit 20 or the port module 30, the voltage backflow can be prevented by the NMOS tubes whose sources are connected to each other, thereby improving the stability of the battery pack 100. For example, when there is an abnormal voltage in the port module 30, since the sources of the first switch tube Q1 and the fourth switch tube Q4 are connected together, and according to the current flow direction of the NMOS tube from the source to the drain, it can be known that when the third pin outputs an abnormal voltage, although the abnormal voltage can flow through the fourth switch tube Q4, it will be separated by the first switch tube Q1, thereby ensuring that the abnormal voltage in the port module 30 will not be input into the battery control circuit 20.

[0082] Further, such as Figure 4 As shown, the switch control circuit 42 includes a fifth switch tube Q5, which is electrically connected to the port ground pin M3 and electrically connected to the preset control node G1, and is used to respond to the floating state of the port ground pin M3, enter the switch cut-off state to lower the voltage of the preset control node G1, so that the switch unit 41 enters the switch cut-off state, or, respond to the grounding state of the port ground pin M3, enter the switch conduction state to raise the voltage of the preset control node G1, so that the switch unit 41 enters the switch conduction state.

[0083] In some embodiments, please combine Figure 1 and Figure 4, the fifth switch tube Q5 is a PMOS tube. When the port ground pin M3 is connected to the load ground pin L1, the port ground pin M3 is electrically connected to the battery ground pin N1 through the load ground pin L1, so that the gate of the fifth switch tube Q5 receives a low-level signal and is turned on, so that the preset control node is connected to the 12V voltage through the fifth switch tube Q5, and the voltage of the preset control node G1 is raised, so that the switch unit 41 enters the switch-on state. When the port ground pin M3 is in a suspended state, the fifth switch tube Q5 is also in a cut-off state, so that the preset control node G1 is grounded through the resistor R3, and the voltage of the preset control node G1 is pulled down, so that the switch unit 41 enters the switch-off state.

[0084] See also Figure 5 , in some embodiments, the battery control circuit 20 includes a battery management chip 21, a signal acquisition circuit 22 and a controller 23;

[0085] The battery management chip 21 is electrically connected to the battery module 10 and is used to detect the working data of the battery module 10;

[0086] The signal acquisition circuit 22 is electrically connected to the power management chip 21 and is used to collect environmental data of the battery module 21;

[0087] The controller 23 is electrically connected to the battery management chip 21 , respectively. The controller 23 is provided with a battery communication pin M4 . The controller 23 is electrically connected to the switch module 40 based on the battery communication pin M4 .

[0088] Specifically, when it is necessary to control the charging and discharging of the battery module 10, the battery management chip 21 outputs a driving signal to the battery module 10 to start charging or discharging the battery module 10. After the battery module 10 starts charging and discharging, the battery management chip 21 detects the voltage of each battery cell in the battery module 10 and the output voltage, output current and other working data of the battery module 10, and transmits the working data to the controller 23, so that the controller 23 transmits the working data to the switch module 40 through the battery communication pin M4.

[0089] After the controller 23 transmits the working data to the switch module 40 through the battery communication pin M4, it also receives the modification data fed back by the switch module 40 based on the battery communication pin M4, and transmits the modification data to the battery management chip 21, so that the battery management chip 21 controls the working state of the battery module 10 based on the modification data, and further adjusts the output voltage and output current of the battery module 10. Based on this, the communication interaction between the battery management chip 21 and the load 200 can be realized through the controller 23.

[0090] In another embodiment, when the battery module 10 starts to charge and discharge, the battery management chip 21 will also collect environmental data such as the temperature and discharge current of the battery module 10 in real time based on the signal acquisition circuit 22, and determine whether the battery module 10 has overcurrent, overdischarge or abnormal temperature based on the environmental data. If so, a shutdown signal is output to the battery module to stop the charging and discharging of the battery module 10.

[0091] In some embodiments, please combine Figure 4 , the charging and discharging circuit 10 includes a sixth switch tube Q6 and a seventh switch tube Q7;

[0092] The gate of the sixth switch tube Q6 and the gate of the seventh switch tube Q7 are respectively connected to the battery management chip 21, the source of the sixth switch tube Q6 is connected to the battery positive pin N2 of the battery cell module 10, the drain of the sixth switch tube Q6 is connected to the drain of the seventh switch tube Q7, and the source of the seventh switch tube Q7 is connected to the port positive pin of the port module 30 (the first pin of the port module).

[0093] When the battery management chip 21 outputs a driving signal, the sixth switch tube Q6 is turned on because the conduction condition is met, and the seventh switch tube Q7 is also turned on. When the sixth switch tube Q6 and the seventh switch tube Q7 are turned on, the voltage of the battery module 10 is output to the port positive pin M1 of the port module 30 through the battery positive pin N2, the sixth switch tube Q6 and the seventh switch tube Q7. At this time, if the port module 30 and the load 200 are in a plug-in state, the load 200 can be powered by the port module 30.

[0094] In some embodiments, if the load 200 is a power supply device, that is, when the port module 30 is plugged into the load 200, a voltage is input to the battery positive pin N2 through the port module 30, the seventh switch tube Q7 and the sixth switch tube Q6, thereby charging the battery cell module 10.

[0095] Wherein, the sixth switch tube Q6 and the seventh switch tube Q7 are NMOS tubes.

[0096] In some embodiments, please combine Figure 5 , the signal acquisition circuit 22 includes a temperature detection circuit 221 and a current detection circuit 222;

[0097] The temperature detection circuit 221 is electrically connected to the battery management chip 21 and is used to detect the temperature of the battery module 10;

[0098] The current detection circuit 222 is electrically connected to the battery negative electrode pin N1 and to the battery management chip 21 , and is used to detect current data of the battery cell module 10 .

[0099] After the battery module 10 starts to charge and discharge, the battery management chip 21 will detect the battery temperature of the battery module 10 in real time based on the temperature detection circuit 221, and detect the current signal in the circuit based on the current measurement circuit 222, and control the battery module 10 to stop charging and discharging when the temperature of the battery module 10 is abnormal and / or the current signal in the circuit is too large, so as to avoid over-discharge or over-temperature of the battery module 10, thereby improving the stability of the battery module 10.

[0100] In some embodiments, see Figure 4 The temperature detection circuit 222 includes a resistor R1, and the resistor R1 is connected to the temperature detection pin of the battery detection chip 21. The resistor R1 is a thermistor, and its resistance value changes with the change of temperature. Based on this, it can be detected and judged whether the resistance value of the resistor R1 is within the preset range. If not, it can be determined that the temperature of the battery module 10 is abnormal.

[0101] In some embodiments, the current detection circuit 222 includes a resistor R2, and the resistor R2 is respectively connected to the battery negative electrode pin N2, the port ground pin M3, and the battery management chip 21. When the battery module 10 starts to charge and discharge, the output voltage of the battery positive electrode pin N2 will flow through the port module 30 and the resistor R2 and then return to the battery negative electrode pin N1; at this time, the battery management chip 21 will detect the voltage on the resistor R2, and amplify the voltage several times and convert it into a digital signal, so as to determine whether the battery module 10 has an overcurrent or other conditions based on the digital signal.

[0102] An embodiment of the present invention provides a battery pack, which includes a battery cell module, including a battery positive pin and a battery negative pin; a battery control circuit, which is electrically connected to the battery cell module; a port module, which is used to be plugged into a load, including a port positive pin and a port ground pin, the port positive pin is electrically connected to the battery positive pin, the load includes a load positive pin and a load ground pin, the port ground pin is electrically connected to the battery negative pin based on the load ground pin; a switch module, which is electrically connected between the battery control circuit and the port module and is also electrically connected to the port ground pin, when the port positive pin is electrically connected to the load positive pin, but the port ground pin is disconnected from the load ground pin, the switch module enters a switch cut-off state in response to the suspended state of the port ground pin, so as to cut off the target loop formed by the battery cell module, the load, the port module and the battery control circuit. At this time, when the battery cell module outputs voltage to the port module, the voltage will be isolated by the switch module, thereby preventing the voltage output by the battery cell module from flowing back into the battery control circuit, thereby improving the stability of the battery pack.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may also be combined, the steps may be implemented in any order, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they may still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery pack, characterized in that: include: A battery cell module, including a positive battery pin and a negative battery pin; A port module, used for plugging with a load, wherein the port module comprises a port positive pin and a port ground pin, the port positive pin is electrically connected to the battery positive pin, the load comprises a load positive pin and a load ground pin, the port ground pin is electrically connected to the battery negative pin based on the load ground pin; A battery control circuit, electrically connected to the battery module; A switch module is electrically connected between the battery control circuit and the port module and is also electrically connected to the port ground pin. When the port positive pin is electrically connected to the load positive pin but the port ground pin is disconnected from the load ground pin, the switch module enters a switch cut-off state in response to the suspended state of the port ground pin to cut off the target loop formed by the battery cell module, the load, the port module and the battery control circuit.

2. The battery pack according to claim 1, characterized in that: The port module further includes a port communication pin, the load further includes a load communication pin, the battery control circuit includes a battery communication pin, and the switch module is electrically connected between the battery communication pin and the port communication pin; When the positive pin of the port is electrically connected to the positive pin of the load, the port communication pin is electrically connected to the load communication pin, and the port ground pin is electrically connected to the load ground pin, the switch module enters the switch-on state in response to the grounding state of the port ground pin, and the battery control circuit transmits communication data to the switch module based on the battery communication pin when the switch module enters the switch-on state, so that the switch module forwards the communication data to the load based on the port communication pin.

3. The battery pack according to claim 2, characterized in that: The target circuit is a circuit formed by the battery positive pin, the port positive pin, the load positive pin, the port communication pin, the switch module and the battery control circuit.

4. The battery pack according to claim 2, characterized in that: The switch module comprises: a switch unit, electrically connected between the battery communication pin and the port communication pin; A switch control circuit is electrically connected to the port ground pin and also electrically connected to the switch unit, and is used to respond to the floating state of the port ground pin to control the switch unit to enter a switch-off state, or respond to the grounding state of the port ground pin to control the switch unit to enter a switch-on state.

5. The battery pack according to claim 4, characterized in that: The battery communication pin includes a battery communication receiving pin and a battery communication sending pin, and the port communication pin includes a port communication receiving pin and a port communication sending pin; The switch unit comprises a first switch circuit and a second switch circuit which are electrically connected to a preset control node, the first switch circuit is electrically connected between the battery communication receiving pin and the port communication receiving pin, the second switch circuit is electrically connected between the battery communication sending pin and the port communication sending pin, and the switch control circuit is electrically connected to the preset control node; The switch control circuit responds to the floating state of the port ground pin to control the first switch circuit and the second switch circuit to enter the switch-off state, or the switch control circuit responds to the grounding state of the port ground pin to control the first switch circuit and the second switch circuit to enter the switch-on state.

6. The battery pack according to claim 5, characterized in that: The first switch circuit includes a first switch tube and a second switch tube, the first switch tube and the second switch tube are connected in series between the battery communication receiving pin and the port communication receiving pin and are electrically connected to the switch control circuit at the preset control node respectively; and / or, The second switch circuit includes a third switch tube and a fourth switch tube, and the third switch tube and the fourth switch tube are connected in series between the battery communication sending pin and the port communication sending pin and are electrically connected to the switch control circuit at the preset control node.

7. The battery pack according to claim 5, characterized in that: The switch control circuit includes a fifth switch tube, which is electrically connected to the port ground pin and to the preset control node, and is used to respond to the floating state of the port ground pin, enter the switch-off state to lower the voltage of the preset control node, so that the switch unit enters the switch-off state, or, respond to the grounding state of the port ground pin, enter the switch-on state to raise the voltage of the preset control node, so that the switch unit enters the switch-on state.

8. The battery pack according to any one of claims 1 to 7, characterized in that: The battery control circuit comprises: A battery management chip, electrically connected to the battery module; A signal acquisition circuit, electrically connected to the battery management chip, for collecting environmental data of the battery module; The controller is electrically connected to the battery management chip. The controller is provided with a battery communication pin. The controller is electrically connected to the switch module based on the battery communication pin.

9. The battery pack according to claim 8, characterized in that: The signal acquisition circuit comprises: A temperature detection circuit, electrically connected to the battery management chip, for detecting the temperature of the battery module; A current detection circuit is electrically connected to the negative electrode pin of the battery and to the battery management chip, and is used to detect current data of the battery cell module.

10. An electronic device, characterized in that: include: load; and A battery pack as claimed in any one of claims 1 to 9.

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