Circuit for battery management system, and battery system

Abstract

The present application relates to a circuit for a battery management system, and a battery system. The circuit comprises: a processing chip, which is configured to control, when a battery pack requires charging, an auxiliary driving module to amplify a driving current; and a charging driving module, which is configured to turn on a charging path between a battery connection interface and an external connection interface, driven by an amplified driving current, wherein the processing chip is further configured to control, when the battery pack requires discharging, a discharging driving module to turn on a discharging path between the battery connection interface and the external connection interface.

Description

A circuit for a battery management system and a battery system

[0001] The present application claims priority to the Chinese patent application No. 2024207831999, filed on April 17, 2024, with the Chinese Patent Office, the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of battery, in particular to a circuit for a battery management system and a battery system. BACKGROUND

[0003] A battery management system (BMS, Battery Management System), also known as a battery nanny or a battery housekeeper. The battery management system can realize intelligent management and maintenance of each battery unit, prevent overcharging and overdischarging of the battery, prolong the service life of the battery, and monitor the state of the battery. TECHNICAL PROBLEM

[0004] In the related art, the charge and discharge management reliability of the battery management system is poor, the anti-interference ability is poor, the circuit structure is complex, and the hardware cost is high. TECHNICAL SOLUTION

[0005] In a first aspect, the present application provides a circuit for a battery management system, comprising:

[0006] a processing chip;

[0007] a battery connection interface connected with the processing chip and a battery pack, respectively;

[0008] an external connection interface connected with an external device;

[0009] a discharge driving module connected with the processing chip, the external connection interface and the battery connection interface, respectively;

[0010] an auxiliary driving module connected with the processing chip and the external connection interface, respectively;

[0011] a charge driving module connected with the auxiliary driving module, the external connection interface and the battery connection interface, respectively;

[0012] The processing chip is configured to control the auxiliary driving module to amplify a driving current when the battery pack needs to be charged, and transmit the amplified driving current to the charge driving module;

[0013] The charge driving module is configured to turn on a charging path between the battery connection interface and the external connection interface under the driving of the amplified driving current, so as to charge the battery pack.

[0014] The processing chip is further configured to control the discharge driving module to turn on a discharge path between the battery connection interface and the external connection interface to discharge to the external device when the battery pack needs to be discharged.

[0015] In a second aspect, the application provides a battery system comprising a battery pack and the circuit for a battery management system. Advantages

[0016] The circuit for a battery management system and the battery system provided by the application have the following advantages:

[0017] The charging driving module is connected between the external connection interface and the battery connection interface, thereby enabling fast charging and discharging management of the battery pack. The application optimizes the design of the circuit for a battery management system, simplifies the circuit structure, and reduces the hardware cost. A single processing chip is used for control and management. When charging is needed, the charging control pin of the processing chip first controls the auxiliary driving module to work, and then drives the charging driving module through the auxiliary driving module, so that the charging driving module quickly turns on and works, turns on the charging path between the external connection interface and the battery connection interface, i.e., turns on the charging path between the battery pack and the charging device, to achieve fast and stable charging of the battery pack. When discharging is needed, the discharging control pin of the processing chip controls the discharging driving module to quickly turn on and work, turns on the discharging path between the external connection interface and the battery connection interface, i.e., turns on the discharging path between the battery pack and the load, to achieve fast and stable discharging of the battery pack, thereby improving the anti-interference capability and the charging and discharging management reliability of the circuit. BRIEF DESCRIPTION OF DRAWINGS

[0018] FIG. 1 is a first circuit schematic diagram of the circuit for a battery management system in the embodiment of the application;

[0019] FIG. 2 is a second circuit schematic diagram of the circuit for a battery management system in the embodiment of the application;

[0020] FIG. 3 is a third circuit schematic diagram of the circuit for a battery management system in the embodiment of the application;

[0021] FIG. 4 is a fourth circuit schematic diagram of the circuit for a battery management system in the embodiment of the application;

[0022] FIG. 5 is a fifth circuit schematic diagram of the circuit for a battery management system in the embodiment of the application;

[0023] FIG. 6 is a sixth circuit schematic diagram of the circuit for a battery management system in the embodiment of the application.

[0024] Reference signs:

[0025] 100, processing chip; 200, battery connection interface; 210, total negative port; 220, electric core connection port; 300, external connection interface; 310, first connection port; 400, discharge driving module; 410, discharge driving unit; 500, auxiliary driving module; 600, charging driving module; 610, charging driving unit; 700, balancing module; 810, current detection module; 820, temperature detection module; 830, communication connection module; 840, charging detection unit; 850, discharging detection unit;

[0026] G1, first triode; G2, second triode; G3, third triode; R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; R5, fifth resistor; R6, sixth resistor; R7, seventh resistor; R8, eighth resistor; R9, ninth resistor; D1, first diode; D2, second diode; D3, third diode; G11, first switch tube; G12, second switch tube; C1, first capacitor; C2, second capacitor. Embodiments of the present application

[0027] It should be noted that the terms "first", "second", and the like in the description and claims of the present application and the above drawings are used to distinguish similar objects and are not necessarily used to describe a particular sequential or chronological order. It should be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the present application described herein are capable of operating in other sequences than illustrated and / or described. Moreover, the terms "comprise", "have" and any variations thereof are intended to cover a non-exclusive inclusion, such that processes, methods, articles, or apparatuses that comprise, have, or are otherwise including a list of steps or elements do not necessarily comprise, have, or otherwise include only those steps or elements specifically listed or a group of steps or elements necessarily present to some extent.

[0028] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not intended to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0029] In addition, in addition to indicating the orientation or positional relationship, the above-mentioned part of the terms may also be used to indicate other meanings, for example, the term "upper" may also be used to indicate a certain dependent relationship or connection relationship in some cases. For those skilled in the art, the specific meaning of these terms in the present application can be understood according to the specific circumstances.

[0030] In addition, the term "a plurality of" shall mean two or more.

[0031] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0032] In one implementation, as shown in FIG. 1, a circuit for a battery management system is provided, including a processing chip 100, a battery connection interface 200, an external connection interface 300, a discharge driving module 400, an auxiliary driving module 500, and a charging driving module 600. The processing chip 100 includes a battery pin group, a discharge control pin, and a charging control pin; the battery connection interface 200 is connected to the battery pin group, and the battery connection interface 200 is used to connect a battery pack, the battery pack including a plurality of single cells connected in series; the external connection interface 300 is used to connect an external device; the discharge driving module 400 is connected to the discharge control pin; the discharge driving module 400 is connected between the external connection interface 300 and the battery connection interface 200; the auxiliary driving module 500 is connected to the charging control pin and the external connection interface 300, respectively; the charging driving module 600 is connected to the auxiliary driving module 500; and the charging driving module 600 is connected between the external connection interface 300 and the battery connection interface 200.

[0033] The processing chip 100 is a battery management chip, and has functions of battery charging management and battery discharging management. For example, the processing chip 100 can be a chip of SH3676016B model.

[0034] The processing chip 100 can include a battery pin group, which is used to connect a battery pack arranged at the battery connection interface 200, and the battery pin group can be composed of a plurality of battery connection pins. The battery pack can be composed of a plurality of single cells connected in series, and each battery connection pin is arranged in one-to-one correspondence with each single cell. For example, the number of battery connection pins can be 17 (such as pins VC0 to VC16). The processing chip 100 further includes a discharge control pin and a charging control pin; the discharge control pin can be used to output a first level signal, and the first level signal is used to drive the discharge driving module 400 to turn on and work; and the charging control pin can be used to output a second level signal, and the second level signal is used to drive the auxiliary driving module 500 to turn on and work.

[0035] The battery pin group can be connected to the battery connection interface 200 by plugging or welding, so that the battery pin group is electrically connected to the battery connection interface 200. The battery group can be connected to the battery connection interface 200 by plugging, and the battery group is electrically connected to the battery connection interface 200, that is, the battery group is electrically connected to the battery pin group of the processing chip 100. For example, the battery group can be composed of 6 to 16 single cells in series.

[0036] In some implementations, the external device includes a load or a charging device.

[0037] The external connection interface 300 can be used to plug in the load, so that when the discharge path between the battery connection interface 200 and the external connection interface 300 is turned on, the battery group can discharge to the load. The external connection interface 300 can also be used to plug in the charging device, so that when the charging path between the battery connection interface 200 and the external connection interface 300 is turned on, the charging device can charge the battery group.

[0038] The discharge drive module 400 can be used to control the discharge path between the battery connection interface 200 and the external connection interface 300 to be turned on. Based on the discharge control pin of the processing chip 100 being electrically connected to the discharge drive module 400, the discharge drive module 400 is electrically connected between the external connection interface 300 and the battery connection interface 200, so that when the battery group needs to be discharged, the discharge control pin of the processing chip 100 can transmit a first level signal to the discharge drive module 400, and the discharge drive module 400 can be quickly turned on according to the first level signal, so that the discharge path between the battery connection interface 200 and the external connection interface 300 is turned on, thereby realizing the fast discharge of the battery group to the load.

[0039] The auxiliary drive module 500 can be used to amplify the drive current and transmit the amplified drive current to the charging drive module 600, so that the charging drive module 600 can quickly turn on. The charging drive module 600 can be used to control the charging path between the battery connection interface 200 and the external connection interface 300 to be turned on. Based on the charging control pin of the processing chip 100 being electrically connected to the external connection interface 300 and the auxiliary drive module 500 being electrically connected to the charging drive module 600, the charging drive module 600 is electrically connected between the external connection interface 300 and the battery connection interface 200, so that when the battery group needs to be charged, the charging control pin of the processing chip 100 can transmit a second level signal to the auxiliary drive module 500, the auxiliary drive module 500 can amplify the drive current according to the second level signal, and transmit the amplified drive current to the charging drive module 600, the charging drive module 600 can quickly turn on according to the amplified drive current, so that the charging path between the battery connection interface 200 and the external connection interface 300 is turned on, thereby realizing the fast charging of the charging device to the battery group.

[0040] The battery connection interface 200 is used for connecting a battery pack, the battery pack comprising a plurality of single cells connected in series, based on the battery pin group of the processing chip 100; the external connection interface 300 is used for connecting a load or a charging device; the discharge driving module 400 is connected to the discharge control pin of the processing chip 100; the discharge driving module 400 is connected between the external connection interface 300 and the battery connection interface 200; the auxiliary driving module 500 is connected to the charging control pin of the processing chip 100 and the external connection interface 300; the charging driving module 600 is connected to the auxiliary driving module 500; the charging driving module 600 is connected between the external connection interface 300 and the battery connection interface 200, thereby enabling fast charging and discharging management of the battery pack.

[0041] The application optimizes the circuit for the battery management system, simplifies the circuit structure, and reduces the hardware cost. A single processing chip 100 is used for control management. When charging is needed, the charging control pin of the processing chip 100 first controls the auxiliary driving module 500 to work, and then drives the charging driving module 600 through the auxiliary driving module 500, so that the charging driving module 600 is quickly turned on to work, the charging path between the external connection interface 300 and the battery connection interface 200 is turned on, that is, the charging path between the battery pack and the charging device is turned on, and fast and stable charging of the battery pack is realized. When discharging is needed, the discharge control pin of the processing chip 100 controls the discharge driving module 400 to quickly turn on to work, the discharging path between the external connection interface 300 and the battery connection interface 200 is turned on, that is, the discharging path between the battery pack and the load is turned on, and fast and stable discharging of the battery pack is realized, thereby improving the anti-interference ability and the charging and discharging management reliability of the circuit.

[0042] In one embodiment, as shown in FIG. 2, the auxiliary driving module 500 comprises a first triode G1, a second triode G2, a first resistor R1, a second resistor R2, and a first diode D1; the anode of the first diode D1 is connected to the charging control pin, the cathode of the first diode D1 is connected to the emitter of the first triode G1 and the charging driving module 600 respectively, the collector of the first triode G1 is connected to the first end of the first resistor R1, the base of the first triode G1 is connected to the emitter of the second triode G2, the collector of the second triode G2 is connected to the external connection interface 300, and the base of the second triode G2 is connected to the first end of the second resistor R2 and the anode of the first diode D1 respectively; the second end of the first resistor R1 and the second end of the second resistor R2 are connected to the external connection interface 300 respectively.

[0043] The first triode G1 and the second triode G2 can be PNP type triodes.

[0044] When the battery pack needs to be charged, the charging control pin of the processing chip 100 outputs a second level signal (such as a high level signal), the second level signal is transmitted to the base of the second transistor G2, and then the second transistor G2 and the first transistor G1 are sequentially turned on, after two-stage transistor current amplification, an amplified driving current is generated, and the amplified driving current is transmitted to the charging driving module 600, and then the charging driving module 600 realizes fast conduction work according to the amplified driving current, so that the charging path between the battery connection interface 200 and the external connection interface 300 is turned on, thereby realizing that the charging equipment quickly charges the battery pack.

[0045] In one implementation, as shown in FIG. 2, the battery connection interface 200 includes a total negative port 210, the external connection interface 300 includes a first connection port 310, and the charging driving module 600 includes a plurality of charging driving units 610, and the control ends of the charging driving units 610 are respectively connected to the auxiliary driving module 500; the charging driving units 610 are connected in parallel between the total negative port 210 and the first connection port 310.

[0046] The first connection port 310 is a negative connection port. For example, when the first connection port 310 is connected to a load, the first connection port 310 is a negative connection port of the load, and when the first connection port 310 is connected to a charging equipment, the first connection port 310 is a negative connection port of the charging equipment.

[0047] The charging driving module 600 can be composed of a plurality of charging driving units 610. It should be noted that the number of charging driving units 610 is determined according to the power of the battery pack, and the greater the number of charging driving units 610, the stronger the charging driving energy.

[0048] For example, the charging driving module 600 can include 6 charging driving units 610, the 6 charging driving units 610 are connected in parallel between the total negative port 210 and the first connection port 310, the control ends of the charging driving units 610 are respectively electrically connected to the auxiliary driving module 500, and then when the battery pack needs to be charged, the charging control pin of the processing chip 100 can transmit a second level signal to the auxiliary driving module 500, the auxiliary driving module 500 amplifies the driving current according to the second level signal, and transmits the amplified driving current to the charging driving units 610, and the charging driving units 610 realize fast conduction work according to the amplified driving current, so that the charging path between the battery connection interface 200 and the external connection interface 300 is turned on, thereby realizing that the charging equipment quickly charges the battery pack.

[0049] In one example, as shown in FIG. 2, the charging driving unit 610 includes a first switch tube G11 and a third resistor R3; a first end of the third resistor R3 is connected to the auxiliary driving module 500, a second end of the third resistor R3 is connected to a gate of the first switch tube G11, a drain of the first switch tube G11 is connected to the total negative port 210, and a source of the first switch tube G11 is connected to the first connection port 310.

[0050] In the formula, the first switch tube G11 can be an N-type MOS tube; and the third resistor R3 is a current-limiting resistor.

[0051] For example, when the battery pack needs to be charged, the charging control pin of the processing chip 100 can transmit a second level signal to the auxiliary driving module 500, the auxiliary driving module 500 amplifies a driving current according to the second level signal, and transmits the amplified driving current to the gate of the first switch tube G11 of the same charging driving unit 610 through the third resistor R3 of the corresponding charging driving unit 610, so that the gate of the first switch tube G11 of each charging driving unit 610 maintains a high level, and then the first switch tube G11 of each charging driving unit 610 is quickly turned on, so that the charging path between the battery connection interface 200 and the external connection interface 300 is turned on, thereby realizing fast charging of the battery pack by the charging device.

[0052] The single processing chip 100 is used for control management, when charging is needed, the charging control pin of the processing chip 100 first controls the auxiliary driving module 500 to work, and then drives the charging driving module 600 through the auxiliary driving module 500, so that the charging driving module 600 is quickly turned on and works, and the charging path between the external connection interface 300 and the battery connection interface 200 is turned on, that is, the charging path between the battery pack and the charging device is turned on, thereby realizing fast and stable charging of the battery pack. Through the optimization design of the circuit for the battery management system, the circuit structure is simplified, the hardware cost is reduced, and the anti-interference ability and discharge management reliability of the circuit are improved.

[0053] In one implementation, as shown in FIG. 3, the discharging driving module 400 includes a plurality of discharging driving units 410, and the control ends of the discharging driving units 410 are respectively connected to the discharging control pin; and the discharging driving units 410 are connected in parallel between the total negative port 210 and the charging driving unit 610.

[0054] The discharging driving module 400 can be composed of a plurality of discharging driving units 410. It should be noted that the number of the discharging driving units 410 is determined according to the power of the battery pack, and the greater the number of the discharging driving units 410, the stronger the discharging driving energy.

[0055] For example, the discharging driving module 400 can include 6 discharging driving units 410, which are connected in parallel between the total negative port 210 and the charging driving unit 610, and the control end of each discharging driving unit 410 is electrically connected to the discharging control pin of the processing chip 100. When the battery pack needs to be discharged, the discharging control pin of the processing chip 100 can transmit a first level signal to each discharging driving unit 410, and the discharging driving unit 410 can realize fast conduction work according to the first level signal, so that the discharging path between the battery connection interface 200 and the external connection interface 300 is conducted, thereby realizing fast discharging of the battery pack to the load.

[0056] In one implementation, as shown in FIG. 3, the discharging driving unit 410 includes a second switch tube G12 and a fourth resistor R4; the first end of the fourth resistor R4 is connected to the discharging control pin, the second end of the fourth resistor R4 is connected to the gate of the second switch tube G12, the source of the second switch tube G12 is connected to the total negative port 210, and the drain of the second switch tube G12 is connected to the discharging driving unit 410.

[0057] In one implementation, as shown in FIG. 3, the discharging driving unit 410 includes a second switch tube G12 and a fourth resistor R4; the first end of the fourth resistor R4 is connected to the discharging control pin, the second end of the fourth resistor R4 is connected to the gate of the second switch tube G12, the source of the second switch tube G12 is connected to the total negative port 210, and the drain of the second switch tube G12 is connected to the discharging driving unit 410.

[0058] When the battery pack needs to be discharged, the discharging control pin of the processing chip 100 outputs a first level signal, the first level signal is transmitted to the gate of the second switch tube G12 of the same discharging driving unit 410 through the fourth resistor R4 of the corresponding discharging driving unit 410, and the second switch tube G12 realizes fast conduction according to the first level signal, so that the discharging path between the battery connection interface 200 and the external connection interface 300 is conducted, thereby realizing fast discharging of the battery pack to the load.

[0059] When the battery pack needs to be discharged, the discharging control pin of the processing chip 100 outputs a first level signal, the first level signal is transmitted to the gate of the second switch tube G12 of the same discharging driving unit 410 through the fourth resistor R4 of the corresponding discharging driving unit 410, and the second switch tube G12 realizes fast conduction according to the first level signal, so that the discharging path between the battery connection interface 200 and the external connection interface 300 is conducted, thereby realizing fast discharging of the battery pack to the load.

[0060] In one implementation, as shown in FIG. 4, the circuit for the battery management system further includes a plurality of equalization modules 700, the battery pin group includes a plurality of battery connection pins, and the battery connection interface 200 includes a plurality of cell connection ports 220; the first end of each equalization module 700 is connected to each battery connection pin one by one, and the second end of each equalization module 700 is connected to each cell connection port 220 one by one.

[0061] The number of the equalization modules 700 is determined according to the number of the cell connection ports 220. For example, if the battery connection interface 200 includes 16 cell connection ports 220, then the number of the equalization modules 700 is 16. The battery group equalization module 700 can be used to equalize and adjust the charging and discharging voltage of the single cell. The battery pin group can include 17 battery connection pins (such as pins VC0 to VC16). The battery connection interface 200 can include 17 cell connection ports 220 (such as B0 to B16), and the battery connection interface 200 can be plugged into 6 to 16 single cells connected in series.

[0062] The first end of each equalization module 700 is electrically connected to each battery connection pin one by one, and the second end of each equalization module 700 is electrically connected to each cell connection port 220 one by one. Then, the adjacent two battery connection pins of the processing chip 100 can detect the voltage of the corresponding single cell in real time. When the voltage of the corresponding single cell reaches the equalization condition (for example, when the voltage is greater than a preset threshold), the processing chip 100 transmits an equalization driving signal to the corresponding equalization module 700 through the corresponding battery connection pin, and then the corresponding equalization module 700 is turned on to work, so that the equalization module 700 and the corresponding single cell form an external equalization discharge loop, and the corresponding single cell is controlled to discharge, so that the voltage of each single cell of the battery group reaches equalization.

[0063] In one implementation, as shown in FIG. 5, the equalization module 700 includes a third transistor G3, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a first capacitor C1, and a second capacitor C2. The collector of the third transistor G3 is connected to the first end of the fifth resistor R5, the emitter of the third transistor G3 is connected to the cell connection port 220 corresponding to the negative electrode of the same single cell, the base of the third transistor G3 is connected to the first end of the sixth resistor R6, the second end of the sixth resistor R6 is connected to the second end of the seventh resistor R7, the second end of the seventh resistor R7 is connected to the battery connection pin corresponding to the negative electrode of the same single cell, and the first end of the seventh resistor R7 is connected to the emitter of the third transistor G3. The second end of the fifth resistor R5 is connected to the cell connection port 220 corresponding to the positive electrode of the same single cell, the first end of the eighth resistor R8 is connected to the second end of the fifth resistor R5, and the second end of the eighth resistor R8 is connected to the battery connection pin corresponding to the positive electrode of the same single cell. The first capacitor C1 is connected between the second end of the eighth resistor R8 and the second end of the seventh resistor R7. The second capacitor C2 is connected between the second end of the seventh resistor R7 and the ground.

[0064] The third transistor G3 can be an NPN transistor. The eighth resistor R8 and the first capacitor C1 form a filter circuit, the fifth resistor R5 is a discharge load resistor, the sixth resistor R6 is a current limiting resistor, and the seventh resistor R7 and the second capacitor C2 form another filter circuit.

[0065] For example, the negative electrode of the single battery is connected to the battery connection port B0, the positive electrode of the single battery is connected to the battery connection port B1, the battery connection pin VC0 of the processing chip 100 detects the voltage of the battery connection port B0, the battery connection pin VC1 of the processing chip 100 detects the voltage of the battery connection port B1, and the voltage of the corresponding single battery is determined according to the voltage difference detected between the battery connection pin VC0 and the battery connection pin VC1 of the processing chip 100. When the voltage of the corresponding single battery reaches the equalization condition (for example, the voltage is greater than a preset threshold), the processing chip 100 outputs an equalization driving signal through the battery connection pin VC0, the equalization driving signal is transmitted to the base of the third transistor G3 through the sixth resistor R6, the third transistor G3 is turned on, and then an external equalization discharge loop is formed among the third transistor G3, the fifth resistor R5 and the corresponding single battery, so as to control the corresponding single battery to discharge, so that the voltages of the single batteries in the battery pack reach equalization.

[0066] In one implementation, as shown in FIG. 5, the circuit for the battery management system further includes a second diode D2, a third diode D3 and a ninth resistor R9; the first end of the ninth resistor R9 is connected to the battery connection port corresponding to the negative electrode of the first single battery, and the second end of the ninth resistor R9 is connected to the total negative port 210; the first single battery is the single battery adjacent to and connected to the total negative port 210; the cathode of the second diode D2 is connected to the battery connection pin corresponding to the negative electrode of the first single battery, and the anode of the second diode D2 is connected to the total negative port 210; the cathode of the third diode D3 is connected to the battery connection pin corresponding to the positive electrode of the first single battery, and the anode of the third diode D3 is connected to the total negative port 210.

[0067] Among them, the second diode D2 and the third diode D3 are Schottky diodes. The first single battery refers to the single battery connected between the battery connection port B1 and the battery connection port B0, that is, the negative electrode of the first single battery is the total negative electrode of the battery pack.

[0068] Based on the cathode of the second diode D2 being connected to the battery connection pin corresponding to the negative electrode of the first single battery, and the anode of the second diode D2 being connected to the total negative port 210, and the cathode of the third diode D3 being connected to the battery connection pin corresponding to the positive electrode of the first single battery, and the anode of the third diode D3 being connected to the total negative port 210, the anti-random order power-on and power-off capability can be improved.

[0069] Based on the first end of the ninth resistor R9 being connected to the battery connection port corresponding to the negative electrode of the first single battery, and the second end of the ninth resistor R9 being connected to the total negative port 210, the influence of current interference on the lowest voltage sampling accuracy can be reduced during large-current charging and discharging, and the single battery random order power-on requirement can be supported.

[0070] In one implementation, as shown in FIG. 6, the circuit for the battery management system further comprises a current detection module 810 and a temperature detection module 820; the processing chip 100 further comprises a temperature detection pin and a current detection pin; the temperature detection pin is connected to the temperature detection module 820, and the temperature detection module 820 is used to connect a temperature sensing probe; the current detection pin is connected to the current detection module 810, and the current detection module is connected between the external connection interface 300 and the battery connection interface 200.

[0071] The current detection pin of the processing chip 100 is used to collect the charging and discharging current of the battery pack, for example, the current detection pin of the processing chip 100 is pin RS1 and pin RS2. The current detection module 810 can comprise a filter capacitor, for example, a first filter capacitor connected between the pin RS1 and the ground wire, and a second filter capacitor connected between the pin RS2 and the ground wire, and the first filter capacitor and the second filter capacitor are of the same model. A third filter capacitor is connected between the pin RS1 and the pin RS2. For example, the current detection module 810 can comprise a filter resistor, for example, a first filter resistor connected to the pin RS1 and a second filter resistor connected to the pin RS2. The current detection module 810 further comprises a plurality of sampling resistors. Each sampling resistor is connected in parallel between the pin RS1 and the pin RS2 of the processing chip 100, for example, the number of sampling resistors can be 5.

[0072] The temperature detection pin of the processing chip 100 can be used to detect the charging and discharging temperature of the battery pack. For example, the temperature detection pin of the processing chip 100 can be pin TS1 to pin TS3, the pin TS1 is connected to a resistor and a capacitor in parallel, the pin TS2 is connected to a resistor and a capacitor in parallel, and the pin TS3 is connected to a resistor and a capacitor in parallel. The temperature detection module 820 can comprise a temperature detection interface, and a temperature sensing probe can be plugged into the temperature detection interface. The temperature detection pin is connected to the temperature detection module 820, and the temperature detection module 820 is used to connect the temperature sensing probe. Through the temperature sensing probe, 3-way temperature detection can be realized, and charging high temperature, charging low temperature, discharging high temperature, discharging low temperature, etc. of single battery cell can be realized. For example, the pin TS3 can be used to detect the temperature of the single battery cell, and can also be used to detect the temperature of the discharging driving module 400. Through the current detection module 810 to detect the current of the circuit in real time, and through the temperature detection module 820 to detect the temperature in real time, the corresponding protection function can be realized according to the current data and the temperature data, and the safety performance of the system is improved.

[0073] In one implementation, as shown in FIG. 6, the circuit for the battery management system further comprises a communication connection module 830; the processing chip 100 further comprises a communication pin; the communication pin is connected to the communication connection module 830, and the communication connection module 830 is used to plug into a terminal device.

[0074] The communication pin of the processing chip 100 can be a pin RXD and a pin TXD. The communication connection module 830 can be used to plug a terminal device, for example, the terminal device can be a computer or a mobile phone, and the communication connection module 830 can be a serial communication connection module 830. For example, the communication connection module 830 is provided with a USB interface, and the terminal device is plugged into the USB interface of the communication connection module 830 through a USB connecting line, so as to realize the communication connection between the terminal device and the processing chip 100, so that the terminal device can read the relevant parameters of the processing device, realize the functional diversification of the battery management system, improve the practicability, and meet most application scenarios.

[0075] In one implementation, as shown in FIG. 6, the circuit for the battery management system further includes a charging detection unit 840 and a discharging detection unit 850; the processing chip 100 further includes a charging detection pin and a discharging detection pin; the charging detection pin is connected to the charging detection unit 840, and the charging detection unit 840 is connected to the charging driving module 600; the discharging detection pin is connected to the discharging detection unit 850, and the discharging detection unit 850 is connected to the discharging driving module 400.

[0076] In one implementation, as shown in FIG. 6, the circuit for the battery management system further includes a charging detection unit 840 and a discharging detection unit 850; the processing chip 100 further includes a charging detection pin and a discharging detection pin; the charging detection pin is connected to the charging detection unit 840, and the charging detection unit 840 is connected to the charging driving module 600; the discharging detection pin is connected to the discharging detection unit 850, and the discharging detection unit 850 is connected to the discharging driving module 400.

[0077] For example, the charging detection unit 840 can include a charging detection resistor, a first end of the charging detection resistor is connected to the charging detection unit 840, and a second end of the charging detection resistor is connected to the charging driving module 600; when it is necessary to detect the charging device, the processing chip 100 turns on an internal pull-up current source of the pin CHGD, and when the pin CHGD of the processing chip 100 detects that the voltage is less than a first preset value, it is determined that the charging device is connected for charging; when the pin CHGD of the processing chip 100 detects that the voltage is greater than the first preset value, it is determined that the charging device is disconnected from the charging.

[0078] The discharging detection unit 850 can include a discharging detection resistor, a first end of the discharging detection resistor is connected to the discharging detection unit 850, and a second end of the discharging detection resistor is connected to the discharging driving module 400; when it is necessary to detect the load, the processing chip 100 turns on an internal pull-down resistor of the pin DSGD, and when the pin DSGD of the processing chip 100 detects that the voltage is greater than a second preset value, it is determined that the load is connected for discharging; when the pin DSGD of the processing chip 100 detects that the voltage is less than the second preset value, it is determined that the load is disconnected from the discharging, so as to realize the charging and discharging detection of the battery pack.

[0079] In one example, the battery pack can include 16 single cells connected in series, the battery connection interface 200 includes cell connection ports B0 to B16, the cell connection port B0 is connected to the negative electrode of the first section of single cells, the cell connection port B1 is connected to the positive electrode of the first section of single cells, the cell connection port B2 is connected to the positive electrode of the second section of single cells, and so on.

[0080] When compatibility with different string numbers is required, B16 is shorted to B15 to B6. For example, when 16 single cells connected in series are configured as 13 strings, the cell connection port B13, the cell connection port B14, the cell connection port B15, and the cell connection port B16 are shorted, and the corresponding first capacitor C1 and the second capacitor C2 are also shorted, thereby enabling the number of single cell strings to be adjusted randomly between 6 and 16 sections, and compatible with many use scenarios.

[0081] In one implementation, a battery system is also provided, including a battery pack and a circuit for a battery management system according to any one of the above.

[0082] In one example, the battery pack can include 16 single cells connected in series, the battery pack can include 16 single cells connected in series, and the single cells can be, but are not limited to, ternary or iron lithium cells.

[0083] Based on the processing chip including a battery pin group, a discharge control pin, and a charging control pin; the battery connection interface connects the battery pin group, the battery connection interface is used to connect a battery pack, the battery pack includes a plurality of single cells connected in series; the external connection interface is used to connect a load or a charging device; the discharge driving module is connected to the discharge control pin; the discharge driving module is connected between the external connection interface and the battery connection interface; the auxiliary driving module is connected to the charging control pin and the external connection interface; the charging driving module is connected to the auxiliary driving module; and the charging driving module is connected between the external connection interface and the battery connection interface, thereby enabling fast charging and discharging management of the battery pack. The present application optimizes the design of the circuit for the battery management system, simplifies the circuit structure, and reduces the hardware cost. When charging is required, the charging control pin of the processing chip first controls the auxiliary driving module to work, and then drives the charging driving module through the auxiliary driving module, so that the charging driving module is quickly turned on and works, the charging path between the external connection interface and the battery connection interface is turned on, that is, the charging path between the battery pack and the charging device is turned on, and fast and stable charging of the battery pack is realized; when discharging is required, the discharge control pin of the processing chip controls the discharge driving module to quickly work, the discharge path between the external connection interface and the battery connection interface is turned on, that is, the discharge path between the battery pack and the load is turned on, and fast and stable discharging of the battery pack is realized, thereby improving the anti-interference ability and the charging and discharging management reliability of the circuit.

[0084] It should be noted that the battery system can also include components such as a case, and a specific battery system can include more components than those described in the above embodiments, or combine certain components, or have a different arrangement of components.

Claims

1. A circuit for a battery management system, characterized in that, The application relates to a battery charging and discharging device. The device comprises: a processing chip; a battery connection interface connected with the processing chip and a battery pack respectively; an external connection interface connected with an external device; a discharge driving module connected with the processing chip, the external connection interface and the battery connection interface respectively; an auxiliary driving module connected with the processing chip and the external connection interface respectively; a charging driving module connected with the auxiliary driving module, the external connection interface and the battery connection interface respectively; the processing chip is configured to control the auxiliary driving module to amplify a driving current and transmit the amplified driving current to the charging driving module when the battery pack needs to be charged; the charging driving module is configured to turn on a charging path between the battery connection interface and the external connection interface under the driving of the amplified driving current to charge the battery pack; 2. The circuit for battery management system according to claim 1, wherein, the processing chip is further configured to control the discharge driving module to turn on a discharging path between the battery connection interface and the external connection interface to discharge the external device when the battery pack needs to be discharged. The processing chip comprises a discharge control pin and a charging control pin, wherein the discharge driving module is connected with the discharge control pin and the auxiliary driving module is connected with the charging control pin; the discharge control pin is configured to output a first level signal to control the discharge driving module to turn on; 3. The circuit for a battery management system of claim 2, wherein, the charging control pin is configured to output a second level signal to the auxiliary driving module, and the second level signal is the driving current. The auxiliary driving module comprises a two-stage transistor; 4. The circuit for a battery management system of claim 3, wherein, the two-stage transistor is configured to amplify the second level signal to generate the amplified driving current. The two-stage transistor comprises a first transistor and a second transistor; the auxiliary driving module further comprises a first resistor, a second resistor and a first diode; an anode of the first diode is connected with the charging control pin, a cathode of the first diode is connected with an emitter of the first transistor and the charging driving module respectively, a collector of the first transistor is connected with a first end of the first resistor, a base of the first transistor is connected with an emitter of the second transistor, a collector of the second transistor is connected with the external connection interface, and a base of the second transistor is connected with a first end of the second resistor and an anode of the first diode respectively; 5. The circuit for a battery management system according to any one of claims 1-4, characterized in that, a second end of the first resistor and a second end of the second resistor are connected with the external connection interface respectively.

6. The circuit for a battery management system of claim 5, wherein, The charging driving unit comprises a first switch tube configured to be turned on under the action of the amplified driving current. The charging driving unit further comprises a third resistor; 7. The circuit for a battery management system according to any one of claims 2-4, characterized in that, a first end of the third resistor is connected with the auxiliary driving module, a second end of the third resistor is connected with a gate of the first switch tube, a drain of the first switch tube is connected with the total negative port, and a source of the first switch tube is connected with the first connection port.

8. The circuit for a battery management system of claim 7, wherein, The discharge driving unit comprises a second switch tube configured to be turned on under the action of the first level signal. The discharge driving unit further comprises a fourth resistor; A first end of the fourth resistor is connected to the discharge control pin, a second end of the fourth resistor is connected to a gate of a second switch tube, a source of the second switch tube is connected to the total negative port, and a drain of the second switch tube is connected to the discharge driving unit.

9. The circuit for a battery management system according to any one of claims 1-8, characterized in that, The battery connection interface includes a total negative port, the external connection interface includes a first connection port, the charging driving module includes at least one charging driving unit, and control ends of the charging driving units are respectively connected to the auxiliary driving module. The charging driving units are connected in parallel between the total negative port and the first connection port.

10. The circuit for a battery management system of claim 9, wherein, The discharge driving module includes at least one discharge driving unit, and control ends of the discharge driving units are respectively connected to the discharge control pin. The discharge driving units are connected in parallel between the total negative port and the charging driving units.

11. The circuit for a battery management system of claim 9, wherein, The circuit for the battery management system further includes at least one balancing module, the battery pin group includes at least one battery connection pin, and the battery connection interface includes at least one cell connection port. First ends of the balancing modules are respectively connected to the battery connection pins, and second ends of the balancing modules are respectively connected to the cell connection ports.

12. The circuit for a battery management system of claim 11, wherein, The balancing module includes a third transistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first capacitor and a second capacitor. A collector of the third transistor is connected to a first end of the fifth resistor, an emitter of the third transistor is connected to a cell connection port of a negative electrode of a same single cell, a base of the third transistor is connected to a first end of the sixth resistor, a second end of the sixth resistor is connected to a second end of the seventh resistor, the second end of the seventh resistor is connected to a battery connection pin of the negative electrode of the same single cell, and a first end of the seventh resistor is connected to the emitter of the third transistor. A second end of the fifth resistor is connected to a cell connection port of a positive electrode of the same single cell, a first end of the eighth resistor is connected to the second end of the fifth resistor, and a second end of the eighth resistor is connected to a battery connection pin of the positive electrode of the same single cell. The first capacitor is connected between the second end of the eighth resistor and the second end of the seventh resistor, and the second capacitor is connected between the second end of the seventh resistor and a ground wire.

13. The circuit for a battery management system of claim 12, wherein, The circuit for the battery management system further includes a second diode, a third diode and a ninth resistor. A first end of the ninth resistor is connected to a cell connection port of a negative electrode of a first single cell, and a second end of the ninth resistor is connected to the total negative port; the first single cell is a single cell adjacent to and connected to the total negative port. A cathode of the second diode is connected to a battery connection pin of the negative electrode of the first single cell, and an anode of the second diode is connected to the total negative port; a cathode of the third diode is connected to a battery connection pin of a positive electrode of the first single cell, and an anode of the third diode is connected to the total negative port.

14. The circuit for a battery management system according to any one of claims 1-13, wherein, The circuit for the battery management system further includes a current detection module and a temperature detection module, and the processing chip further includes a temperature detection pin and a current detection pin. The temperature detection pin is connected with the temperature detection module, and the temperature detection module is used for connecting a temperature sensing probe; The battery detection pin is connected with the current detection module, and the current detection module is connected between the external connection interface and the battery connection interface.

15. The circuit for a battery management system according to any one of claims 1-14, wherein, The circuit for the battery management system further comprises a communication connection module, and the processing chip further comprises a communication pin; The communication pin is connected with the communication connection module, and the communication connection module is used for plugging a terminal device.

16. The circuit for a battery management system according to any one of claims 1-15, wherein, The circuit for the battery management system further comprises a charging detection unit and a discharging detection unit, and the processing chip further comprises a charging detection pin and a discharging detection pin; The charging detection pin is connected with the charging detection unit, and the charging detection unit is connected with the charging driving module; The discharging detection pin is connected with the discharging detection unit, and the discharging detection unit is connected with the discharging driving module.

17. A battery system characterized by, A battery pack and a circuit for a battery management system according to any one of claims 1 to 16.

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