Battery packs, battery systems and power-consuming devices

Abstract

The present application relates to a battery pack, a battery system and an electrical device, wherein the battery pack includes: at least one battery module, a battery pack case and a protection circuit. The battery module and the battery pack case are insulated; the positive electrode of the battery module is electrically connected to the total positive terminal through the protection circuit, the negative electrode of the battery module is electrically connected to the total negative terminal through the protection circuit, and the control end of the protection circuit is connected to the battery protection system; the protection circuit is used to turn on the insulation protection according to the insulation abnormality signal provided by the battery protection system. The present application uses the protection circuit to stop the battery module from charging and discharging to the outside through the total positive terminal and the total negative terminal when an insulation abnormality occurs in the battery module, thereby achieving that during the operation of the battery pack, the battery module with insulation abnormality will stop working, while other battery modules will work normally, thereby avoiding safety problems caused by the battery module with insulation abnormality continuing to work during the operation of the battery pack.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack, a battery system and an electrical device. Background Art

[0002] In a battery system, there is an insulation design between the battery and the battery pack case. When insulation abnormalities occur between the battery and the battery pack case, the battery pack may have safety risks when in use. Therefore, how to eliminate the safety hazards of the battery pack when in use in the case of insulation abnormalities is a technical problem that technical personnel in this field urgently need to solve. Utility Model Content

[0003] The present application provides a battery pack, a battery system and an electrical device, which can activate insulation protection according to the insulation abnormality of a battery module, so that the battery module with the insulation abnormality stops working, thereby ensuring the safe operation of the battery pack.

[0004] In the first aspect, the present application provides a battery pack, which includes: at least one battery module, a battery pack box and a protection circuit. The battery module and the battery pack box are insulated; the positive electrode of the battery module is electrically connected to the total positive terminal through the protection circuit, the negative electrode of the battery module is electrically connected to the total negative terminal through the protection circuit, and the control end of the protection circuit is connected to the battery protection system; the protection circuit is used to turn on the insulation protection according to the insulation abnormality signal provided by the battery protection system.

[0005] In the technical solution of the embodiment of the present application, the battery pack includes at least one battery module, each battery module is connected in parallel, the positive electrode of each battery module is electrically connected to the total positive terminal of the battery pack through a corresponding protection circuit, and the negative electrode of each battery module is electrically connected to the total negative terminal of the battery pack through a corresponding protection circuit, and each battery module is wrapped in a battery pack box, and the battery pack box and each battery module are insulated. The battery protection system will perform real-time detection of the insulation between the battery pack box and each battery module. When an insulation abnormality is detected between the battery pack box and the battery module, an insulation abnormality signal will be output to the corresponding protection circuit, so that the protection circuit starts insulation protection, so that the battery module stops charging and discharging to the outside through the total positive terminal and the total negative terminal to achieve insulation protection, so that when any battery module in the battery pack has an insulation abnormality, only the battery module with the insulation abnormality stops working, while other battery modules work normally, avoiding safety problems caused by the battery module with the insulation abnormality continuing to work during the operation of the battery pack.

[0006] In some embodiments, the protection circuit includes a first protection resistor, a second protection resistor, a first switch and a second switch; the positive electrode of the battery module is electrically connected to the total positive terminal through the first protection resistor, the first protection resistor is connected in parallel with the first switch, the negative electrode of the battery module is electrically connected to the total negative terminal through the second protection resistor, and the second protection resistor is connected in parallel with the second switch; the control end of the first switch and the control end of the second switch are both electrically connected to the battery protection system; wherein the first switch and the second switch are used to disconnect according to the insulation abnormality signal. When the battery protection system detects that an insulation abnormality occurs between the battery pack box and the battery module, the first switch and the second switch are disconnected, so that the first protection resistor and the second protection resistor are connected. Since the first protection resistor and the second protection resistor are both resistors with large resistance values, the input and output of the positive and negative electrodes of the battery module can be limited, so that the battery module stops charging and discharging to the outside through the total positive terminal and the total negative terminal to achieve insulation protection, avoiding safety problems caused by the battery module with insulation abnormality continuing to work during the operation of the battery pack.

[0007] In some embodiments, the first switch is a first relay, and the second switch is a second relay; the first protection resistor is connected in parallel with the first relay, and the second protection resistor is connected in parallel with the second relay; the control end of the first relay and the control end of the second relay are both electrically connected to the battery protection system. By switching the first relay and the second relay from the on state to the off state, the first protection resistor and the second protection resistor are connected to limit the input and output of the positive and negative electrodes of the battery module, so that the battery module stops charging and discharging to the outside through the total positive terminal and the total negative terminal, achieving insulation protection, and avoiding safety problems caused by the battery module with abnormal insulation continuing to work during the operation of the battery pack.

[0008] In some embodiments, the first switch is a first switch tube, and the second switch is a second switch tube; the first protection resistor is connected in parallel with the first switch tube, and the second protection resistor is connected in parallel with the second switch tube; the control end of the first switch tube and the control end of the second switch tube are both electrically connected to the battery protection system. By switching the first switch tube and the second switch tube from the on state to the off state, the first protection resistor and the second protection resistor are connected to limit the input and output of the positive and negative electrodes of the battery module, so that the battery module stops charging and discharging to the outside through the total positive terminal and the total negative terminal, and insulation protection is achieved, thereby avoiding safety problems caused by the battery module with abnormal insulation continuing to work during the operation of the battery pack.

[0009] In some embodiments, the protection circuit includes a third switch and a fourth switch; the positive electrode of the battery module is electrically connected to the total positive terminal through the third switch, and the negative electrode of the battery module is electrically connected to the total negative terminal through the fourth switch; the control end of the third switch and the control end of the fourth switch are both electrically connected to the battery protection system; wherein the third switch and the fourth switch are used to disconnect according to the insulation abnormality signal. By disconnecting the third switch and the fourth switch, the connection between the positive electrode of the battery module and the total positive terminal is disconnected, and the connection between the negative electrode of the battery module and the total negative terminal is disconnected, so that the battery module stops charging and discharging to the outside through the total positive terminal and the total negative terminal, and insulation protection is achieved, thereby avoiding safety problems caused by the battery module with insulation abnormality continuing to work during the operation of the battery pack.

[0010] In some embodiments, the third switch is a third relay, and the fourth switch is a fourth relay; the positive electrode of the battery module is electrically connected to the total positive terminal through the third relay, and the negative electrode of the battery module is electrically connected to the total negative terminal through the fourth relay; the control end of the third relay and the control end of the fourth relay are both electrically connected to the battery protection system. By switching the third relay and the fourth relay from the on state to the off state, the connection between the positive electrode of the battery module and the total positive terminal is disconnected, and the connection between the negative electrode of the battery module and the total negative terminal is disconnected, so that the battery module stops charging and discharging to the outside through the total positive terminal and the total negative terminal, and insulation protection is achieved, avoiding safety problems caused by the battery module with abnormal insulation continuing to work during the operation of the battery pack.

[0011] In some embodiments, the third switch is a third switch tube, and the fourth switch is a fourth switch tube; the positive electrode of the battery module is electrically connected to the total positive terminal through the third switch tube, and the negative electrode of the battery module is electrically connected to the total negative terminal through the fourth switch tube; the control end of the third switch tube and the control end of the fourth switch tube are both electrically connected to the battery protection system. By switching the third switch tube and the fourth switch tube from the on state to the off state, the connection between the positive electrode of the battery module and the total positive terminal is disconnected, and the connection between the negative electrode of the battery module and the total negative terminal is disconnected, so that the battery module stops charging and discharging to the outside through the total positive terminal and the total negative terminal, and insulation protection is achieved, thereby avoiding safety problems caused by the battery module with abnormal insulation continuing to work during the operation of the battery pack.

[0012] In a second aspect, the present application provides a battery system, which includes a battery pack as described in the above embodiment.

[0013] In a third aspect, the present application provides an electrical device, which includes a battery system as described in the above embodiment, and the battery system is used to provide electrical energy.

[0014] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 A schematic diagram of the structure of a battery pack according to an embodiment of the present application.

[0017] Figure 2 This is a schematic structural diagram of another battery pack according to an embodiment of the present application.

[0018] Figure 3 This is a schematic structural diagram of another battery pack according to an embodiment of the present application. DETAILED DESCRIPTION

[0019] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0021] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0022] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0023] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0024] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0025] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0026] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0027] With the rapid development of new energy vehicles, electric vehicles are gaining more and more attention. The main components of electric vehicles include batteries, motors, electric steering, electric air conditioners, electric air compressors, and high-voltage cables. The voltage of batteries is generally above 300V. Therefore, in the battery system, there is an insulation design between the battery and the battery pack box to protect the lives of drivers and passengers. When there is an insulation abnormality between the battery and the battery pack box, there will be safety risks when the battery pack is used.

[0028] Therefore, in order to solve the problem of insulation abnormalities between the battery and the battery pack case, which causes safety hazards when the battery pack is in use, the present application provides a battery pack. When an insulation abnormality occurs in the battery module, the protection circuit limits the power supply of the battery module to the total positive and negative terminals of the battery pack. Therefore, during the operation of the battery pack, the battery module with the insulation abnormality will stop working, while other battery modules will work normally, thereby avoiding safety problems caused by the battery module with the insulation abnormality continuing to work during the operation of the battery pack.

[0029] The battery pack disclosed in the embodiment of the present application can be used, but not limited to, in electrical devices such as vehicles, ships or aircraft. A power supply system comprising the battery pack, battery system, etc. disclosed in the present application can be used to form the electrical device, so that insulation protection can be turned on according to the insulation abnormality of the battery module, so that the battery module with insulation abnormality stops working, thereby ensuring the safe operation of the battery pack.

[0030] The embodiment of the present application provides an electric device using a battery system as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0031] According to some embodiments of the present application, Figure 1 This is a schematic diagram of the structure of a battery pack according to an embodiment of the present application. Figure 1 As shown, the battery pack includes: at least one battery module 100, a battery pack case 200 and a protection circuit 300. The battery module 100 is insulated from the battery pack case 200; the positive electrode of the battery module 100 is electrically connected to the total positive terminal 201 through the protection circuit 300, the negative electrode of the battery module 100 is electrically connected to the total negative terminal 202 through the protection circuit 300, and the control terminal 301 of the protection circuit 300 is connected to the battery protection system 400; the protection circuit 300 is used to turn on the insulation protection according to the insulation abnormality signal provided by the battery protection system 400.

[0032] Exemplarily, taking the number of battery modules 100 as 3, at least one battery module 100 includes a first battery module 110, a second battery module 120 and a third battery module 130. The first battery module 110, the second battery module 120 and the third battery module 130 are connected in parallel, and the battery module 100 includes at least one battery cell, each battery cell is connected in series in sequence, and the negative electrode of the battery cell is electrically connected to the positive electrode of the next battery cell. The positive electrode of the first battery cell serves as the positive electrode of the battery module 100, and the negative electrode of the last battery cell serves as the negative electrode of the battery module 100.

[0033] The battery cells can also be connected in series to form a battery cell group, and then the battery cell groups are connected in parallel to form a battery module 100. The positive electrodes of the first battery cells in each battery cell group are electrically connected to each other to serve as the positive electrode of the battery module 100, and the negative electrodes of the last battery cells in each battery cell group are electrically connected to each other to serve as the negative electrode of the battery module 100.

[0034] The positive electrode of the first battery module 110 is electrically connected to the total positive terminal 201 through the first protection circuit 310, and the negative electrode of the first battery module 110 is electrically connected to the total negative terminal 202 through the first protection circuit 310. The positive electrode of the second battery module 120 is electrically connected to the total positive terminal 201 through the second protection circuit 320, and the negative electrode of the second battery module 120 is electrically connected to the total negative terminal 202 through the second protection circuit 320. The positive electrode of the third battery module 130 is electrically connected to the total positive terminal 201 through the third protection circuit 330, and the negative electrode of the third battery module 130 is electrically connected to the total negative terminal 202 through the third protection circuit 330. The first control terminal 311 of the first protection circuit 310, the second control terminal 321 of the second protection circuit 320, and the third control terminal 331 of the third protection circuit 330 are all connected to the battery protection system 400. The first battery module 110 , the second battery module 120 , and the third battery module 130 are all disposed in the battery pack case 200 , and the first battery module 110 , the second battery module 120 , and the third battery module 130 are all insulated from the battery pack case 200 .

[0035] The battery protection system 400 detects the insulation conditions between each battery module 100 and the battery pack case 200. When an insulation abnormality is detected between a battery module 100 and the battery pack case 200, an insulation abnormality signal is output to the control terminal 301 of the protection circuit 300 corresponding to the battery module 100. Taking the insulation abnormality between the first battery module 110 and the battery pack case 200 as an example, when the battery protection system 400 detects the insulation abnormality between the first battery module 110 and the battery pack case 200, the first control terminal 311 of the first protection circuit 310 corresponding to the first battery module 110 receives the insulation abnormality signal output by the battery protection system 400, and the first protection circuit 310 turns on insulation protection, thereby limiting the input and output voltages between the first battery module 110 and the total positive terminal 201 and the total negative terminal 202, so that the first battery module 110 stops charging and discharging to the outside through the total positive terminal 201 and the total negative terminal 202. There is no insulation abnormality between the second battery module 120 and the third battery module 130 and the battery pack case 200, so the second battery module 120 and the third battery module 130 still operate normally, supplying power to the total positive terminal 201 and the total negative terminal 202, so that the battery pack can operate normally. Therefore, the present application performs real-time detection of the insulation conditions between the battery pack case 200 and each battery module 100 through the battery protection system 400. When an insulation abnormality is detected between the battery pack case 200 and the battery module 100, an insulation abnormality signal is output to the control terminal 301 of the corresponding protection circuit 300, so that the protection circuit 300 starts insulation protection, thereby causing the battery module 100 to stop charging and discharging to the outside through the total positive terminal 201 and the total negative terminal 202 to achieve insulation protection. In this way, when an insulation abnormality occurs in any battery module 100 in the battery pack, only the battery module 100 with the insulation abnormality stops working, while other battery modules 100 work normally, thereby avoiding safety problems caused by the battery module 100 with the insulation abnormality continuing to work during the operation of the battery pack.

[0036] It should be noted that the number of battery modules 100 being three is only an example, and the specific number of battery modules 100 needs to be set according to actual conditions and is not specifically limited here.

[0037] It should be noted that the battery protection system may be a system that can implement insulation detection, such as a BMS, and is not specifically limited here.

[0038] In some embodiments, Figure 2 This is a schematic diagram of the structure of another battery pack according to an embodiment of the present application. Figure 2As shown, the protection circuit includes a first protection resistor R1, a second protection resistor R2, a first switch 340 and a second switch 350. The positive electrode of the battery module 100 is electrically connected to the total positive terminal 201 through the first protection resistor R1, the first protection resistor R1 is connected in parallel with the first switch 340, the negative electrode of the battery module 100 is electrically connected to the total negative terminal 202 through the second protection resistor R2, and the second protection resistor R2 is connected in parallel with the second switch 350; the fourth control terminal 341 of the first switch 340 and the fifth control terminal 351 of the second switch 350 are both electrically connected to the battery protection system 400; wherein the first switch 340 and the second switch 350 are used to disconnect according to the insulation abnormality signal.

[0039] Specifically, when the battery module 100 is operating normally, the first switch 340 and the second switch 350 are turned on, the positive electrode of the battery module 100 is electrically connected to the total positive terminal 201 through the turned-on first switch 340, and the negative electrode of the battery module 100 is electrically connected to the total negative terminal 202 through the turned-on second switch 350, thereby realizing the power supply of the battery module 100 to the total positive terminal 201 and the total negative terminal 202. The battery protection system 400 performs real-time detection of the insulation between the battery module 100 and the battery pack case 200. When an insulation abnormality is detected between the battery module 100 and the battery pack case 200, the battery protection system 400 sends an insulation abnormality signal to the fourth control terminal 341 of the first switch 340 and the fifth control terminal 351 of the second switch 350, so that the first switch 340 and the second switch 350 are disconnected. At this time, the positive electrode of the battery module 100 is electrically connected to the total positive terminal 201 through the first protection resistor R1, and the negative electrode of the battery module 100 is electrically connected to the total negative terminal 202 through the second protection resistor R2. The first protection resistor R1 and the second protection resistor R2 both have relatively large resistance values, which can limit the resistance of the positive and negative outputs of the battery module 100. Therefore, the present application uses the battery protection system 400 to perform real-time detection of the insulation between the battery pack case 200 and the battery module 100. When an insulation abnormality is detected between the battery pack case 200 and the battery module 100, an insulation abnormality signal is output to the fourth control terminal 341 of the first switch 340 and the fifth control terminal 351 of the second switch 350, so that the first switch 340 and the second switch 350 are switched from the on state to the off state, so that the first protection resistor R1 and the second protection resistor R2 are connected. Since the first protection resistor R1 and the second protection resistor R2 are both resistors with relatively large resistance values, the input and output of the positive and negative electrodes of the battery module 100 can be limited, so that the battery module 100 stops charging and discharging to the outside through the total positive terminal 201 and the total negative terminal 202 to achieve insulation protection, thereby avoiding safety problems caused by the battery module 100 with insulation abnormality continuing to work during the operation of the battery pack.

[0040] In some embodiments, the resistance value of the first protection resistor and the resistance value of the second protection resistor are not less than 1 megohm.

[0041] Specifically, when insulation abnormality occurs between the battery pack body and the battery module, the first switch and the second switch are disconnected, so that the positive electrode of the battery module is electrically connected to the total positive terminal through the first protection resistor, and the negative electrode of the battery module is electrically connected to the total negative terminal through the second protection resistor. Since the first protection resistor and the second protection resistor are both resistors with a resistance value of not less than 1 megohm, and the voltage provided by the positive and negative electrodes of the battery module does not exceed 1 kilovolt, when the first protection resistor and the second protection resistor are connected to the loop, the current value of the current in the loop will be reduced to an extremely low value, thereby limiting the input and output of the positive and negative electrodes of the battery module, so that the battery module stops charging and discharging to the outside through the total positive terminal and the total negative terminal, thereby achieving insulation protection.

[0042] In some embodiments, the first switch is a first relay, and the second switch is a second relay; the first protection resistor is connected in parallel with the first relay, and the second protection resistor is connected in parallel with the second relay; the control end of the first relay and the control end of the second relay are both electrically connected to the battery protection system.

[0043] Specifically, when the battery module is working normally, the battery protection system outputs a conduction signal to the control end of the first relay and the control end of the second relay, so that the first relay and the second relay remain conductive, the positive electrode of the battery module is electrically connected to the total positive terminal through the conductive first relay, and the negative electrode of the battery module is electrically connected to the total negative terminal through the conductive second relay, so that the battery module supplies power to the total positive terminal and the total negative terminal. When the battery protection system detects that there is an insulation abnormality between the battery module and the battery pack body, the battery protection system will send an electrical signal to the control end of the first relay and the control end of the second relay as an insulation abnormality signal, so that the first relay and the second relay are disconnected, the positive electrode of the battery module is electrically connected to the total positive terminal through the first protection resistor, and the negative electrode of the battery module is electrically connected to the total negative terminal through the second protection resistor. Therefore, when the battery protection system detects insulation abnormalities between the battery pack case and the battery module, the present application outputs electrical signals to the control end of the first relay and the control end of the second relay, so that the first relay and the second relay switch from the on state to the off state, and the first protection resistor and the second protection resistor are connected to limit the input and output of the positive and negative poles of the battery module, so that the battery module stops charging and discharging to the outside through the total positive terminal and the total negative terminal, thereby achieving insulation protection and avoiding safety problems caused by the battery module with insulation abnormalities continuing to work during the operation of the battery pack.

[0044] In some embodiments, the first switch is a first switch tube, and the second switch is a second switch tube; the first protection resistor is connected in parallel with the first switch tube, and the second protection resistor is connected in parallel with the second switch tube; the control end of the first switch tube and the control end of the second switch tube are both electrically connected to the battery protection system.

[0045] Specifically, when the battery module is operating normally, the battery protection system outputs a first level signal to the control end of the first switch tube and the control end of the second switch tube, so that the first switch tube and the second switch tube remain turned on, the positive electrode of the battery module is electrically connected to the total positive terminal through the turned-on first switch tube, and the negative electrode of the battery module is electrically connected to the total negative terminal through the turned-on second switch tube, so that the battery module supplies power to the total positive terminal and the total negative terminal. When the battery protection system detects that there is an insulation abnormality between the battery module and the battery pack box, the battery protection system will send a second level signal to the control end of the first switch tube and the control end of the second switch tube as an insulation abnormality signal, so that the first relay and the second relay are disconnected, the first level signal and the second level signal are logically opposite level signals, the positive electrode of the battery module is electrically connected to the total positive terminal through the first protection resistor, and the negative electrode of the battery module is electrically connected to the total negative terminal through the second protection resistor. Therefore, when the battery protection system detects insulation abnormalities between the battery pack case and the battery module, the present application outputs a level signal to the control end of the first switch tube and the control end of the second switch tube, so that the first switch tube and the second switch tube are switched from the on state to the off state, and the first protection resistor and the second protection resistor are connected to limit the input and output of the positive and negative poles of the battery module, so that the battery module stops charging and discharging to the outside through the total positive terminal and the total negative terminal, thereby achieving insulation protection and avoiding safety problems caused by the battery module with insulation abnormalities continuing to work during the operation of the battery pack.

[0046] It should be noted that the first switch tube and the second switch tube may be electronic components such as MOS tubes or triodes that can realize switching functions, and are not specifically limited here.

[0047] In some embodiments, Figure 3 This is a schematic diagram of the structure of another battery pack according to an embodiment of the present application. Figure 3 As shown, the protection circuit includes a third switch 360 and a fourth switch 370; the positive electrode of the battery module 100 is electrically connected to the total positive terminal 201 through the third switch 360, and the negative electrode of the battery module 100 is electrically connected to the total negative terminal 202 through the fourth switch 370; the sixth control terminal 361 of the third switch 360 and the seventh control terminal 371 of the fourth switch 370 are both electrically connected to the battery protection system 400; wherein the third switch 360 and the fourth switch 370 are used to disconnect according to the insulation abnormality signal.

[0048] Specifically, when the battery module 100 is working normally, the third switch 360 and the fourth switch 370 are turned on, the positive electrode of the battery module 100 is electrically connected to the total positive terminal 201 through the turned-on third switch 360, and the negative electrode of the battery module 100 is electrically connected to the total negative terminal 202 through the turned-on fourth switch 370, so that the battery module 100 supplies power to the total positive terminal 201 and the total negative terminal 202. The battery protection system 400 performs real-time detection of the insulation between the battery module 100 and the battery pack case 200. When the insulation abnormality between the battery module 100 and the battery pack case 200 is detected, the battery protection system 400 sends an insulation abnormality signal to the sixth control terminal 361 of the third switch 360 and the seventh control terminal 371 of the fourth switch 370, so that the third switch 360 and the fourth switch 370 are disconnected. Therefore, the present application performs real-time detection of the insulation condition between the battery pack case 200 and the battery module 100 through the battery protection system 400. When an insulation abnormality is detected between the battery pack case 200 and the battery module 100, an insulation abnormality signal is output to the sixth control terminal 361 of the third switch 360 and the seventh control terminal 371 of the fourth switch 370, so that the third switch 360 and the fourth switch 370 are switched from the on state to the off state, thereby disconnecting the positive electrode of the battery module 100 from the total positive terminal 201, and disconnecting the negative electrode of the battery module 100 from the total negative terminal 202, so that the battery module 100 stops charging and discharging to the outside through the total positive terminal 201 and the total negative terminal 202, thereby achieving insulation protection and avoiding safety problems caused by the battery module 100 with insulation abnormality continuing to work during the operation of the battery pack.

[0049] In some embodiments, the third switch is a third relay, and the fourth switch is a fourth relay; the positive electrode of the battery module is electrically connected to the total positive terminal through the third relay, and the negative electrode of the battery module is electrically connected to the total negative terminal through the fourth relay; the control end of the third relay and the control end of the fourth relay are both electrically connected to the battery protection system.

[0050] Specifically, when the battery module is working normally, the battery protection system outputs a conduction signal to the control end of the third relay and the control end of the fourth relay, so that the third relay and the fourth relay remain conductive, and the positive electrode of the battery module is electrically connected to the total positive terminal through the conductive third relay, and the negative electrode of the battery module is electrically connected to the total negative terminal through the conductive fourth relay, so that the battery module supplies power to the total positive terminal and the total negative terminal. When the battery protection system detects an insulation abnormality between the battery module and the battery pack body, the battery protection system will send an electrical signal to the control end of the third relay and the control end of the fourth relay as an insulation abnormality signal, so that the third relay and the fourth relay are disconnected. Therefore, the present application performs real-time detection of the insulation condition between the battery pack case and the battery module through the battery protection system. When insulation abnormality is detected between the battery pack case and the battery module, an electrical signal is output to the control end of the third relay and the control end of the fourth relay, so that the third relay and the fourth relay are switched from the on state to the off state, thereby disconnecting the positive pole of the battery module from the total positive terminal, and disconnecting the negative pole of the battery module from the total negative terminal, so that the battery module stops charging and discharging to the outside through the total positive terminal and the total negative terminal, thereby achieving insulation protection and avoiding safety problems caused by the battery module with insulation abnormality continuing to work during the operation of the battery pack.

[0051] In some embodiments, the third switch is a third switch tube, and the fourth switch is a fourth switch tube; the positive electrode of the battery module is electrically connected to the total positive terminal through the third switch tube, and the negative electrode of the battery module is electrically connected to the total negative terminal through the fourth switch tube; the control end of the third switch tube and the control end of the fourth switch tube are both electrically connected to the battery protection system.

[0052] Specifically, when the battery module is working normally, the battery protection system outputs a first level signal to the control end of the third switch tube and the control end of the fourth switch tube, so that the third switch tube and the fourth switch tube remain turned on, and the positive electrode of the battery module is electrically connected to the total positive terminal through the turned-on third switch tube, and the negative electrode of the battery module is electrically connected to the total negative terminal through the turned-on fourth switch tube, so that the battery module supplies power to the total positive terminal and the total negative terminal. When the battery protection system detects that insulation abnormality occurs between the battery module and the battery pack box, the battery protection system sends a second level signal to the control end of the third switch tube and the control end of the fourth switch tube as an insulation abnormality signal, so that the third switch tube and the fourth switch tube are disconnected, and the first level signal and the second level signal are logically opposite level signals. Therefore, the present application performs real-time detection of the insulation condition between the battery pack case and the battery module through the battery protection system. When insulation abnormality is detected between the battery pack case and the battery module, a level signal is output to the control end of the third switch tube and the control end of the fourth switch tube, so that the third switch tube and the fourth switch tube are switched from the on state to the off state, thereby disconnecting the positive electrode of the battery module from the total positive terminal, and disconnecting the negative electrode of the battery module from the total negative terminal, so that the battery module stops charging and discharging to the outside through the total positive terminal and the total negative terminal, thereby achieving insulation protection and avoiding safety problems caused by the battery module with insulation abnormality continuing to work during the operation of the battery pack.

[0053] It should be noted that the third switch tube and the fourth switch tube may be electronic components such as MOS tubes or triodes that can realize switch functions, and are not specifically limited here.

[0054] The present application also provides a battery system, comprising a plurality of battery packs of any kind provided in the above embodiments.

[0055] It can be understood that the battery system provided in the embodiment of the present application can achieve the corresponding beneficial effects of any battery pack provided in the above-mentioned embodiments, which will not be elaborated here.

[0056] The present application also provides an electrical device, including the battery system as described in the above embodiment, and the battery system is used to provide electrical energy.

[0057] It can be understood that the power-consuming device provided in the embodiment of the present application can achieve the corresponding beneficial effects of the battery system provided in the above-mentioned embodiment, which will not be elaborated here.

[0058] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0059] The above is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery pack, characterized in that: include: at least one battery module; A battery pack box, wherein the battery module and the battery pack box are insulated from each other; A protection circuit, wherein the positive electrode of the battery module is electrically connected to the total positive terminal through the protection circuit, the negative electrode of the battery module is electrically connected to the total negative terminal through the protection circuit, and the control end of the protection circuit is connected to the battery protection system; the protection circuit is used to turn on insulation protection according to the insulation abnormality signal provided by the battery protection system.

2. The battery pack according to claim 1, characterized in that: The protection circuit includes a first protection resistor, a second protection resistor, a first switch and a second switch; The positive electrode of the battery module is electrically connected to the total positive terminal through the first protection resistor, the first protection resistor is connected in parallel with the first switch, the negative electrode of the battery module is electrically connected to the total negative terminal through the second protection resistor, the second protection resistor is connected in parallel with the second switch; the control end of the first switch and the control end of the second switch are both electrically connected to the battery protection system; The first switch and the second switch are used to be disconnected according to the insulation abnormality signal.

3. The battery pack according to claim 2, characterized in that: The first switch is a first relay, and the second switch is a second relay; The first protection resistor is connected in parallel with the first relay, and the second protection resistor is connected in parallel with the second relay; a control end of the first relay and a control end of the second relay are both electrically connected to the battery protection system.

4. The battery pack according to claim 2, characterized in that: The first switch is a first switch tube, and the second switch is a second switch tube; The first protection resistor is connected in parallel with the first switch tube, and the second protection resistor is connected in parallel with the second switch tube; the control end of the first switch tube and the control end of the second switch tube are both electrically connected to the battery protection system.

5. The battery pack according to claim 1, characterized in that: The protection circuit includes a third switch and a fourth switch; The positive electrode of the battery module is electrically connected to the total positive terminal through the third switch, and the negative electrode of the battery module is electrically connected to the total negative terminal through the fourth switch; the control end of the third switch and the control end of the fourth switch are both electrically connected to the battery protection system; The third switch and the fourth switch are used to be disconnected according to the insulation abnormality signal.

6. The battery pack according to claim 5, characterized in that: The third switch is a third relay, and the fourth switch is a fourth relay; The positive electrode of the battery module is electrically connected to the total positive terminal through the third relay, and the negative electrode of the battery module is electrically connected to the total negative terminal through the fourth relay; the control end of the third relay and the control end of the fourth relay are both electrically connected to the battery protection system.

7. The battery pack according to claim 5, characterized in that: The third switch is a third switch tube, and the fourth switch is a fourth switch tube; The positive electrode of the battery module is electrically connected to the total positive terminal through the third switch tube, and the negative electrode of the battery module is electrically connected to the total negative terminal through the fourth switch tube; the control end of the third switch tube and the control end of the fourth switch tube are both electrically connected to the battery protection system.

8. A battery system, characterized in that: Comprising a plurality of battery packs as described in any one of claims 1 to 7.

9. An electrical device, characterized in that: The battery system as claimed in claim 8 is used to provide electrical energy.

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