Circuit for battery management system and battery system
By designing a simplified circuit structure and single processing chip control management in the battery management system, the problem of insufficient charging and discharging management reliability and anti-interference ability in the existing battery management system is solved, and fast and stable battery charging and discharging is achieved. Reduces hardware costs.
Patent Information
- Application Number
- CN202420783199.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-15
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-04-15
Smart Images
Figure CN222215239U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of battery technology, and in particular to a circuit and a battery system for a battery management system. Background Art
[0002] The battery management system (BMS), also known as the battery nanny or battery butler, is mainly used to intelligently manage and maintain each battery unit, prevent the battery from overcharging and over-discharging, extend the battery life, and monitor the battery status.
[0003] In the prior 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. Utility Model Content
[0004] Based on this, it is necessary to provide a circuit and battery system for a battery management system that can improve anti-interference ability and charge and discharge management reliability, and has a simple circuit structure and low hardware cost to address the problems existing in the above-mentioned existing battery management systems.
[0005] In a first aspect, the present application provides a circuit for a battery management system, comprising:
[0006] A processing chip, the processing chip includes a battery pin group, a discharge control pin, and a charge control pin;
[0007] A battery connection interface, the battery connection interface is connected to a battery pin group, and the battery connection interface is used to connect a battery pack, and the battery pack includes a plurality of single cells connected in series;
[0008] External connection interface, the external connection interface is used to connect a load or a charging device;
[0009] A discharge drive module, the discharge drive module is connected to the discharge control pin; the discharge drive module is connected between the external connection interface and the battery connection interface;
[0010] An auxiliary drive module, the auxiliary drive module is connected to the charging control pin and the external connection interface respectively;
[0011] A charging drive module is connected to the auxiliary drive module; the charging drive module is connected between the external connection interface and the battery connection interface.
[0012] In one embodiment, the auxiliary driving module includes a first triode, a second triode, a first resistor, a second resistor and a first diode;
[0013] The anode of the first diode is connected to the charging control pin, the cathode of the first diode is respectively connected to the emitter of the first triode and the charging drive module, the collector of the first triode is connected to the first end of the first resistor, the base of the first triode is connected to the emitter of the second triode, the collector of the second triode is connected to the external connection interface, and the base of the second triode is respectively connected to the first end of the second resistor and the anode of the first diode;
[0014] The second end of the first resistor and the second end of the second resistor are respectively connected to the external connection interface.
[0015] In one embodiment, the battery connection interface includes a total negative port, the external connection interface includes a first connection port, the charging drive module includes a plurality of charging drive units, and the control end of each charging drive unit is respectively connected to the auxiliary drive module;
[0016] The charging drive units are connected in parallel between the total negative port and the first connection port.
[0017] In one embodiment, the charging drive unit includes a first switch tube and a third resistor;
[0018] A first end of the third resistor is connected to the auxiliary driving module, a second end of the third resistor is connected to the gate of the first switch tube, a drain of the first switch tube is connected to the total negative port, and a source of the first switch tube is connected to the first connection port.
[0019] In one embodiment, the discharge driving module includes a plurality of discharge driving units, and the control end of each discharge driving unit is respectively connected to the discharge control pin;
[0020] The discharge drive units are connected in parallel between the total negative port and the charge drive unit.
[0021] In one embodiment, the discharge driving unit includes a second switch tube and a fourth resistor;
[0022] A first end of the fourth resistor is connected to the discharge control pin, a second end of the fourth resistor is connected to the gate of the 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.
[0023] In one embodiment, the circuit for the battery management system further includes a plurality of equalization modules, the battery pin group includes a plurality of battery connection pins, and the battery connection interface includes a plurality of battery cell connection ports;
[0024] The first end of each balancing module is connected to each battery connection pin in a one-to-one correspondence, and the second end of each balancing module is connected to each battery cell connection port in a one-to-one correspondence.
[0025] In one embodiment, the balancing module includes a third triode, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first capacitor and a second capacitor;
[0026] The collector of the third triode is connected to the first end of the fifth resistor, the emitter of the third triode is connected to the battery cell connection port corresponding to the negative electrode of the same single battery cell, the base of the third triode is connected to the first end of the sixth resistor, the second end of the sixth resistor is connected to the second end of the seventh resistor, the second end of the seventh resistor is connected to the battery connection pin corresponding to the negative electrode of the same single battery cell, and the first end of the seventh resistor is connected to the emitter of the third triode;
[0027] The second end of the fifth resistor is connected to the battery cell connection port corresponding to the positive electrode of the same single battery cell, the first end of the eighth resistor is connected to the second end of the fifth resistor, and the second end of the eighth resistor is connected to the battery connection pin corresponding to the positive electrode of the same single battery cell;
[0028] The first capacitor is connected between the second end of the eighth resistor and the second end of the seventh resistor; the second capacitor is connected between the second end of the seventh resistor and the ground line.
[0029] In one of the embodiments, the circuit for a battery management system further includes a second diode, a third diode and a ninth resistor;
[0030] The first end of the ninth resistor is connected to the cell connection port corresponding to the negative electrode of the first single cell, and the 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;
[0031] The cathode of the second diode is connected to the battery connection pin corresponding to the negative electrode of the first single battery cell, and the anode of the second diode is connected to the total negative port; the cathode of the third diode is connected to the battery connection pin corresponding to the positive electrode of the first single battery cell, and the anode of the third diode is connected to the total negative port.
[0032] In one embodiment, the circuit for the battery management system further includes a current detection module and a temperature detection module; the processing chip further includes a temperature detection pin and a current detection pin;
[0033] The temperature detection pin is connected to the temperature detection module, and the temperature detection module is used to connect the temperature sensor probe;
[0034] The battery detection pin is connected to the current detection module, and the battery detection module is connected between the external connection interface and the battery connection interface.
[0035] In one embodiment, the circuit for the battery management system further includes a communication connection module; the processing chip further includes a communication pin;
[0036] The communication pin is connected to a communication connection module, and the communication connection module is used to plug in the terminal device.
[0037] In one embodiment, the circuit for the battery management system further includes a charging detection unit and a discharging detection unit; the processing chip further includes a charging detection pin and a discharging detection pin;
[0038] The charge detection pin is connected to the charge detection unit, and the charge detection unit is connected to the charge drive module; the discharge detection pin is connected to the discharge detection unit, and the discharge detection unit is connected to the discharge drive module.
[0039] In a second aspect, the present application provides a battery system, including a battery pack and a circuit for a battery management system as described above.
[0040] One of the above technical solutions has the following advantages and beneficial effects:
[0041] The above-mentioned circuit for the battery management system includes a processing chip, a battery connection interface, an external connection interface, a discharge drive module, an auxiliary drive module and a charging drive module; the processing chip includes a battery pin group, a discharge control pin, and a charging control pin; the battery connection interface is connected to the battery pin group, and the battery connection interface is used to connect a battery pack, and the battery pack includes a number of single cells connected in series; the external connection interface is used to connect a load or a charging device; the discharge drive module is connected to the discharge control pin; the discharge drive module is connected between the external connection interface and the battery connection interface; the auxiliary drive module is connected to the charging control pin and the external connection interface; the charging drive module is connected to the auxiliary drive module; the charging drive module is connected between the external connection interface and the battery connection interface, thereby enabling rapid charging and discharging management of the battery pack. The present application simplifies the circuit structure and reduces the hardware cost by optimizing the design of the circuit for the battery management system, and adopts a single processing chip for control and management. When charging is required, the charging control pin of the processing chip first controls the auxiliary drive module to work, and then drives the charging drive module through the auxiliary drive module, so that the charging drive module is quickly turned on and works, and 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, so as to realize fast and stable charging of the battery pack; when discharging is required, the discharge control pin of the processing chip controls the discharge drive module to quickly turn on and works, and 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, so as to realize fast and stable discharging of the battery pack, thereby improving the anti-interference ability of the circuit and the reliability of charge and discharge management. BRIEF DESCRIPTION OF THE DRAWINGS
[0042] Figure 1 This is a first circuit diagram of a circuit for a battery management system in an embodiment of the present application;
[0043] Figure 2A second circuit diagram of a circuit for a battery management system in an embodiment of the present application;
[0044] Figure 3 A third circuit diagram of a circuit for a battery management system in an embodiment of the present application;
[0045] Figure 4 A fourth circuit diagram of a circuit for a battery management system in an embodiment of the present application;
[0046] Figure 5 A fifth circuit diagram of a circuit for a battery management system in an embodiment of the present application;
[0047] Figure 6 This is a sixth circuit diagram of a circuit for a battery management system in an embodiment of the present application.
[0048] Reference numerals:
[0049] 100, processing chip; 200, battery connection interface; 210, total negative port; 220, battery cell connection port; 300, external connection interface; 310, first connection port; 400, discharge drive module; 410, discharge drive unit; 500, auxiliary drive module; 600, charging drive module; 610, charging drive unit; 700, balancing module; 810, current detection module; 820, temperature detection module; 830, communication connection module; 840, charging detection unit; 850, discharge detection unit;
[0050] 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. DETAILED DESCRIPTION
[0051] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.
[0052] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover inclusions that are not listed. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.
[0053] 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 positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.
[0054] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.
[0055] In addition, the term "plurality" shall mean two or more.
[0056] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0057] In one embodiment, Figure 1As shown, 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 drive module 400, an auxiliary drive module 500 and a charging drive 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, and the battery pack includes a plurality of single cells connected in series; the external connection interface 300 is used to connect a load or a charging device; the discharge drive module 400 is connected to the discharge control pin; the discharge drive module 400 is connected between the external connection interface 300 and the battery connection interface 200; the auxiliary drive module 500 is respectively connected to the charging control pin and the external connection interface 300; the charging drive module 600 is connected to the auxiliary drive module 500; and the charging drive module 600 is connected between the external connection interface 300 and the battery connection interface 200.
[0058] The processing chip 100 is a battery management chip, and has functions of battery charging management and battery discharging management, etc. Exemplarily, the processing chip 100 may be a chip of model SH3676016B.
[0059] The processing chip 100 may include a battery pin group, which is used to connect the battery pack set in the battery connection interface 200, and the battery pin group may be composed of a plurality of battery connection pins. The battery pack may be composed of a plurality of single cells connected in series, and each battery connection pin is connected and arranged in a one-to-one correspondence with each single cell. Exemplarily, the number of battery connection pins may be 17 (such as pin VC0 to pin VC16). The processing chip 100 also includes a discharge control pin and a charge 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 drive module 400 to turn on; the charge control pin can be used to output a second level signal, and the second level signal is used to drive the auxiliary drive module 500 to turn on.
[0060] The battery pin group can be connected and set on 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 pack can be connected and set on the battery connection interface 200 by plugging, and the battery pack is electrically connected to the battery connection interface 200, that is, the battery pack is electrically connected to the battery pin group of the processing chip 100. Exemplarily, the battery pack can be composed of 6 to 16 single cells connected in series.
[0061] The external connection interface 300 can be used to plug in a load, and then when the discharge path between the battery connection interface 200 and the external connection interface 300 is connected, the battery pack can discharge to the load. The external connection interface 300 can also be used to plug in a charging device, and then when the charging path between the battery connection interface 200 and the external connection interface 300 is connected, the charging device can charge the battery pack.
[0062] The discharge driving module 400 can be used to control the conduction of the discharge path between the battery connection interface 200 and the external connection interface 300. Based on the discharge driving module 400 being electrically connected to the discharge control pin of the processing chip 100, the discharge driving module 400 is electrically connected between the external connection interface 300 and the battery connection interface 200, and then when the battery pack needs to be discharged, the discharge control pin of the processing chip 100 can transmit a first level signal to the discharge driving module 400, and the discharge driving module 400 implements a fast conduction operation according to the first level signal, so that the discharge path between the battery connection interface 200 and the external connection interface 300 is conducted, thereby realizing the rapid discharge of the battery pack to the load.
[0063] The auxiliary driving module 500 can be used to amplify the driving current and transmit the amplified driving current to the charging driving module 600, so that the charging driving module 600 can be turned on quickly. The charging driving module 600 can be used to control the charging path between the battery connection interface 200 and the external connection interface 300. Based on the auxiliary driving module 500 electrically connecting the charging control pin of the processing chip 100 and the external connection interface 300, the charging driving module 600 is electrically connected to the auxiliary driving module 500, and the charging driving module 600 is electrically connected between the external connection interface 300 and the battery connection interface 200. 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, and 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 module 600. The charging driving module 600 is turned on quickly 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 device quickly charges the battery pack.
[0064] In the above-mentioned embodiment, based on the battery connection interface 200 connecting the battery pin group of the processing chip 100, the battery connection interface 200 is used to connect the battery pack, and the battery pack includes a number of single cells connected in series; the external connection interface 300 is used to connect the load or charging equipment; the discharge drive module 400 is connected to the discharge control pin of the processing chip 100; the discharge drive module 400 is connected between the external connection interface 300 and the battery connection interface 200; the auxiliary drive module 500 is connected to the charging control pin of the processing chip 100 and the external connection interface 300; the charging drive module 600 is connected to the auxiliary drive module 500; the charging drive module 600 is connected between the external connection interface 300 and the battery connection interface 200, thereby realizing fast charging and discharging management of the battery pack. The present application simplifies the circuit structure and reduces the hardware cost by optimizing the design of the circuit for the battery management system, and adopts a single processing chip 100 for control and management. When charging is required, the charging control pin of the processing chip 100 first controls the auxiliary drive module 500 to work, and then drives the charging drive module 600 through the auxiliary drive module 500, so that the charging drive module 600 is quickly turned on to work, 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, so as to realize fast and stable charging of the battery pack; when discharging is required, the discharge control pin of the processing chip 100 controls the discharge drive module 400 to quickly turn on the work, and the discharge path between the external connection interface 300 and the battery connection interface 200 is turned on, that is, the discharge path between the battery pack and the load is turned on, so as to realize fast and stable discharge of the battery pack, thereby improving the anti-interference ability of the circuit and the reliability of charge and discharge management.
[0065] In one embodiment, Figure 2 As shown, the auxiliary driving module 500 includes 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 respectively connected to the emitter of the first triode G1 and the charging driving module 600, 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 respectively connected to the first end of the second resistor R2 and the anode of the first diode D1; the second end of the first resistor R1 and the second end of the second resistor R2 are respectively connected to the external connection interface 300.
[0066] The first transistor G1 and the second transistor G2 may be PNP transistors.
[0067] When charging is required, the charging control pin of the processing chip 100 outputs a second level signal (such as a high level signal), and 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 turned on in sequence. After the two-stage transistor current is amplified, 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 rapid conduction 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 device quickly charges the battery pack.
[0068] In one embodiment, Figure 2 As shown, the battery connection interface 200 includes a total negative port 210, the external connection interface 300 includes a first connection port 310, the charging drive module 600 includes a plurality of charging drive units 610, and the control end of each charging drive unit 610 is respectively connected to the auxiliary drive module 500; each charging drive unit 610 is connected in parallel between the total negative port 210 and the first connection port 310.
[0069] 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 the negative connection port of the load, and when the first connection port 310 is connected to a charging device, the first connection port 310 is the negative connection port of the charging device.
[0070] The charging drive module 600 may be composed of a plurality of charging drive units 610. It should be noted that the number of the charging drive units 610 is determined according to the power of the battery pack, and the greater the number of the charging drive units 610, the stronger the charging drive energy.
[0071] For example, the charging drive module 600 may include 6 charging drive units 610, and the 6 charging drive units 610 are connected in parallel between the total negative port 210 and the first connection port 310. The control end of each charging drive unit 610 is electrically connected to the auxiliary drive module 500. 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 drive module 500. The auxiliary drive module 500 amplifies the driving current according to the second level signal and transmits the amplified driving current to each charging drive unit 610. Each charging drive unit 610 is quickly turned on 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 enabling the charging device to quickly charge the battery pack.
[0072] In one example, if Figure 2As shown, the charging drive unit 610 includes a first switch tube G11 and a third resistor R3; the first end of the third resistor R3 is connected to the auxiliary drive module 500, the second end of the third resistor R3 is connected to the gate of the first switch tube G11, the drain of the first switch tube G11 is connected to the total negative port 210, and the source of the first switch tube G11 is connected to the first connection port 310.
[0073] The first switch tube G11 may be an N-type MOS tube; the third resistor R3 is a current limiting resistor.
[0074] 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 the 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 enabling the charging device to quickly charge the battery pack.
[0075] In the above embodiment, a single processing chip 100 is used for control and management. When charging is required, the charging control pin of the processing chip 100 first controls the auxiliary drive module 500 to work, and then drives the charging drive module 600 through the auxiliary drive module 500, so that the charging drive 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, so as to realize fast and stable charging of the battery pack. By optimizing the design of the circuit used 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.
[0076] In one embodiment, Figure 3 As shown, the discharge driving module 400 includes a plurality of discharge driving units 410 , and the control end of each discharge driving unit 410 is connected to the discharge control pin respectively; and each discharge driving unit 410 is connected in parallel between the total negative port 210 and the charge driving unit 610 .
[0077] The discharge driving module 400 may be composed of a plurality of discharge driving units 410. It should be noted that the number of the discharge driving units 410 is determined according to the power of the battery pack, and the greater the number of the discharge driving units 410, the stronger the discharge driving energy.
[0078] For example, the discharge drive module 400 may include 6 discharge drive units 410, which are connected in parallel between the total negative port 210 and the charging drive unit 610, and the control end of each discharge drive unit 410 is electrically connected to the discharge control pin of the processing chip 100. When the battery pack needs to be discharged, the discharge control pin of the processing chip 100 can transmit a first level signal to each discharge drive unit 410, and the discharge drive unit 410 can quickly turn on 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 rapid discharge of the battery pack to the load.
[0079] In one embodiment, Figure 3 As shown, the discharge 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 discharge 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 discharge driving unit 410.
[0080] The second switch tube G12 may be an N-type MOS tube; the fourth resistor R4 is a current limiting resistor.
[0081] When the battery pack needs to be discharged, the discharge control pin of the processing chip 100 outputs a first level signal, and the first level signal is transmitted to the gate of the second switch tube G12 of the same discharge drive unit 410 through the fourth resistor R4 of the corresponding discharge drive unit 410. The second switch tube G12 is 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 rapid discharge of the battery pack to the load.
[0082] In the above embodiment, a single processing chip 100 is used for control and management. When discharge is required, the discharge control pin of the processing chip 100 controls the discharge drive module 400 to quickly turn on and turn on the discharge path between the external connection interface 300 and the battery connection interface 200, that is, the discharge path between the battery pack and the load is turned on, thereby achieving fast and stable discharge of the battery pack. By optimizing the design of the circuit used for the battery management system, the circuit structure is simplified, the hardware cost is reduced, and the anti-interference ability of the circuit and the discharge management reliability are improved.
[0083] In one embodiment, Figure 4As shown, the circuit for the battery management system also includes a plurality of balancing modules 700, the battery pin group includes a plurality of battery connection pins, and the battery connection interface 200 includes a plurality of battery cell connection ports 220; the first end of each balancing module 700 is connected to each battery connection pin in a one-to-one correspondence, and the second end of each balancing module 700 is connected to each battery cell connection port 220 in a one-to-one correspondence.
[0084] Among them, the number of balancing modules 700 is determined according to the number of battery cell connection ports 220. For example, if the battery connection interface 200 includes 16 battery cell connection ports 220, the number of balancing modules 700 is 16. The battery pack balancing module 700 can be used to balance the charge and discharge voltage of the single battery cell. The battery pin group may include 17 battery connection pins (such as pin VC0 to pin VC16). The battery connection interface 200 may include 17 battery cell connection ports 220 (such as B0 to B16), and the battery connection interface 200 can be plugged with 6 to 16 single battery cells connected in series.
[0085] Based on the fact that the first end of each balancing module 700 is electrically connected to each battery connection pin in a one-to-one correspondence, and the second end of each balancing module 700 is electrically connected to each battery cell connection port 220 in a one-to-one correspondence, the two adjacent battery connection pins of the processing chip 100 can detect the voltage of the corresponding single battery cell in real time. When it is detected that the voltage of the corresponding single battery cell reaches the balance condition (such as when the voltage is greater than a preset threshold), the processing chip 100 transmits a balance drive signal to the corresponding balancing module 700 through the corresponding battery connection pin, and then the corresponding balancing module 700 is turned on to work, so that the balancing module 700 and the corresponding single battery cell form an external balance discharge loop, and the corresponding single battery cell is controlled to discharge, so that the voltage of each single battery cell of the battery pack is balanced.
[0086] In one embodiment, Figure 5As shown, the balancing module 700 includes a third triode 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 triode G3 is connected to the first end of the fifth resistor R5, the emitter of the third triode G3 is connected to the cell connection port 220 corresponding to the negative electrode of the same single cell, the base of the third triode 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, and the second end of the seventh resistor R7 is connected to the corresponding same The battery connection pin of the negative electrode of the single cell, the first end of the seventh resistor R7 is connected to the emitter of the third triode G3; the second end of the fifth resistor R5 is connected to the battery 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.
[0087] Among them, 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.
[0088] Exemplarily, the negative electrode of the single cell is connected to the cell connection terminal BO, the positive electrode of the single cell is connected to the cell connection port B1, the battery connection pin VC0 of the processing chip 100 detects the voltage of the cell connection port BO, and the battery connection pin VC1 of the processing chip 100 detects the voltage of the cell connection port B1, and the voltage of the corresponding single cell 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 it is detected that the voltage of the corresponding single cell reaches the equilibrium condition (such as when the voltage is greater than the preset threshold), the processing chip 100 outputs an equilibrium drive signal through the battery connection pin VC0, and the equilibrium drive signal is transmitted to the base of the third transistor G3 after passing through the sixth resistor R6, turning on the third transistor G3, thereby forming an external equilibrium discharge loop between the third transistor G3, the fifth resistor R5 and the corresponding single cell, and controlling the corresponding single cell to discharge, so that the voltage of each single cell of the battery pack is balanced.
[0089] In one embodiment, Figure 5As shown, the circuit for the battery management system also 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 cell connection port corresponding to the negative electrode of the first single cell, and the second end of the ninth resistor R9 is connected to the total negative port 210; the first single cell is a single cell 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 cell, 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 cell, and the anode of the third diode D3 is connected to the total negative port 210.
[0090] The second diode D2 and the third diode D3 are Schottky diodes. The first single cell refers to a single cell connected between the cell connection port B1 and the cell connection port B0, that is, the negative electrode of the first single cell is the total negative electrode of the battery pack.
[0091] The cathode of the second diode D2 is connected to the battery connection pin corresponding to the negative electrode of the first single battery cell, 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 cell, and the anode of the third diode D3 is connected to the total negative port 210, thereby improving the ability to resist disordered power on and off.
[0092] Based on the first end of the ninth resistor R9 being connected to the cell connection port corresponding to the negative electrode of the first single cell, the second end of the ninth resistor R9 is connected to the total negative port 210, thereby reducing the influence of current interference on the minimum node voltage acquisition accuracy during large current charging and discharging, and at the same time being able to support the demand for out-of-order power-on of the single cells.
[0093] In one embodiment, Figure 6 As shown, the circuit for the battery management system also includes a current detection module 810 and a temperature detection module 820; the processing chip 100 also includes 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 the temperature sensing probe; the battery detection pin is connected to the current detection module 810, and the battery detection module is connected between the external connection interface 300 and the battery connection interface 200.
[0094] Among them, 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 may include a filter capacitor, such as a first filter capacitor connected between pin RS1 and the ground wire, and a second filter capacitor connected between pin RS2 and the ground wire. The first filter capacitor and the second filter capacitor are of the same model. A third filter capacitor is connected between pin RS1 and pin RS2. Exemplarily, the current detection module 810 may include a filter resistor, such as a first filter resistor connected to pin RS1 and a second filter resistor connected to pin RS2. The current detection module 810 also includes a number of sampling resistors. Each sampling resistor is connected in parallel between pin RS1 and pin RS2 of the processing chip 100. For example, the number of sampling resistors may be 5.
[0095] 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, pin TS1 is connected to an external resistor in parallel with a capacitor, pin TS2 is connected to an external resistor in parallel with a capacitor, and pin TS3 is connected to an external resistor in parallel with a capacitor. The temperature detection module 820 may include a temperature detection interface, a temperature sensing probe may be plugged into the temperature detection interface, a 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; 3-way temperature detection can be achieved through the temperature sensing probe, and high temperature charging, low temperature charging, high temperature discharging, low temperature discharging, etc. of a single cell can be achieved. For example, pin TS3 can detect the temperature of a single cell and can also be used to detect the temperature of the discharge drive module 400. The circuit current is detected in real time by the current detection module 810, and the temperature is detected in real time by the temperature detection module 820, so that the corresponding protection function can be played according to the current data and the temperature data, thereby improving the safety performance of the system.
[0096] In one embodiment, Figure 6 As shown, the circuit for the battery management system further includes a communication connection module 830; the processing chip 100 further includes a communication pin; the communication pin is connected to the communication connection module 830, and the communication connection module 830 is used to plug in the terminal device.
[0097] The communication pins of the processing chip 100 may be a pin RXD and a pin TXD. The communication connection module 830 may be used to plug in a terminal device, for example, the terminal device may be a computer or a mobile phone, and the communication connection module 830 may 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 connection cable, thereby realizing a communication connection between the terminal device and the processing chip 100, so that the terminal device reads the relevant parameters of the processing device, realizes the functional diversification of the battery management system, improves the practicality, and meets most application scenarios.
[0098] In one embodiment, Figure 6 As shown, the circuit for the battery management system also includes a charging detection unit 840 and a discharging detection unit 850; the processing chip 100 also 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 drive 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 drive module 400.
[0099] The charging detection pin of the processing chip 100 may be a pin CHGD, and the discharging detection pin of the processing chip 100 may be a pin DSGD.
[0100] For example, the charging detection unit 840 may 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 drive module 600. Then, when it is necessary to detect the charging device, the processing chip 100 turns on the pull-up current source inside the pin CHGD. When the pin CHGD of the processing chip 100 detects a voltage 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 a voltage greater than the first preset value, it is determined that the charging device is disconnected for charging.
[0101] The discharge detection unit 850 may include a discharge detection resistor, a first end of the discharge detection resistor is connected to the discharge detection unit 850, and a second end of the discharge detection resistor is connected to the discharge driving module 400. When the load needs to be detected, the processing chip 100 opens the pull-down resistor inside the pin DSGD. When the pin DSGD of the processing chip 100 detects a voltage greater than a second preset value, it is determined that the load is connected for discharge; when the pin DSGD of the processing chip 100 detects a voltage less than the second preset value, it is determined that the load is disconnected for discharge, thereby realizing charging and discharging detection of the battery pack.
[0102] In one example, the battery pack may include 16 single cells connected in series, and the battery connection interface 200 includes cell connection ports 220 B0 to B16, where cell connection port B0 is connected to the negative electrode of the first single cell, cell connection port B1 is connected to the positive electrode of the first single cell, cell connection port B2 is connected to the positive electrode of the second single cell, and so on.
[0103] When different numbers of strings are required, B16 needs to be short-circuited to B15 and B6. For example, when 16 series-connected single cells are configured to be in 13 strings, the cell connection ports B13, B14, B15, and B16 are short-circuited, and the corresponding first capacitor C1 and second capacitor C2 are short-circuited, so that the number of single cell strings can be adjusted between 6 and 16, which is compatible with many usage scenarios.
[0104] In one embodiment, a battery system is further provided, comprising a battery pack and any circuit for a battery management system as described above.
[0105] The battery pack may include 16 single cells connected in series, and the single cells may be, but are not limited to, ternary or lithium iron cells.
[0106] Based on the processing chip including a battery pin group, a discharge control pin, and a charge control pin; a battery connection interface is connected to the battery pin group, the battery connection interface is used to connect a battery pack, and the battery pack includes a number of single cells connected in series; an external connection interface is used to connect a load or a charging device; a discharge drive module is connected to the discharge control pin; the discharge drive module is connected between the external connection interface and the battery connection interface; an auxiliary drive module is connected to the charge control pin and the external connection interface; the charge drive module is connected to the auxiliary drive module; the charge drive module is connected between the external connection interface and the battery connection interface, thereby enabling rapid charging and discharging management of the battery pack. The present application simplifies the circuit structure and reduces the hardware cost by optimizing the design of the circuit for the battery management system, and adopts a single processing chip for control and management. When charging is required, the charging control pin of the processing chip first controls the auxiliary drive module to work, and then drives the charging drive module through the auxiliary drive module, so that the charging drive module is quickly turned on and works, and 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, so as to realize fast and stable charging of the battery pack; when discharging is required, the discharge control pin of the processing chip controls the discharge drive module to quickly turn on and works, and 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, so as to realize fast and stable discharging of the battery pack, thereby improving the anti-interference ability of the circuit and the reliability of charge and discharge management.
[0107] It should be noted that the battery system may also include components such as a box, and the specific battery system may include more components than those described in the above embodiments, or combine certain components, or have a different arrangement of components.
[0108] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0109] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.
Claims
1. A circuit for a battery management system, characterized in that: include: A processing chip, the processing chip comprising a battery pin group, a discharge control pin, and a charge control pin; A battery connection interface, the battery connection interface is connected to the battery pin group, the battery connection interface is used to connect a battery pack, and the battery pack includes a plurality of single cells connected in series; An external connection interface, the external connection interface is used to connect a load or a charging device; A discharge driving module, 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; An auxiliary driving module, the auxiliary driving module is connected to the charging control pin and the external connection interface respectively; A charging drive module, wherein the charging drive module is connected to the auxiliary drive module; the charging drive module is connected between the external connection interface and the battery connection interface.
2. The circuit for a battery management system according to claim 1, characterized in that: The auxiliary driving module includes a first triode, a second triode, a first resistor, a second resistor and a first diode; The anode of the first diode is connected to the charging control pin, the cathode of the first diode is respectively connected to the emitter of the first transistor and the charging drive module, the collector of the first transistor is connected to the first end of the first resistor, the base of the first transistor is connected to the emitter of the second transistor, the collector of the second transistor is connected to the external connection interface, and the base of the second transistor is respectively connected to the first end of the second resistor and the anode of the first diode; The second end of the first resistor and the second end of the second resistor are connected to the external connection interface respectively.
3. The circuit for a battery management system according to claim 1, characterized in that: The battery connection interface includes a total negative port, the external connection interface includes a first connection port, the charging drive module includes a plurality of charging drive units, and the control end of each of the charging drive units is respectively connected to the auxiliary drive module; The charging drive units are connected in parallel between the total negative port and the first connection port.
4. The circuit for a battery management system according to claim 3, characterized in that: The charging drive unit includes a first switch tube and a third resistor; The first end of the third resistor is connected to the auxiliary driving module, the second end of the third resistor is connected to the gate of the first switch tube, the drain of the first switch tube is connected to the total negative port, and the source of the first switch tube is connected to the first connection port.
5. The circuit for a battery management system according to claim 3, characterized in that: The discharge driving module comprises a plurality of discharge driving units, and the control end of each of the discharge driving units is respectively connected to the discharge control pin; The discharge driving units are connected in parallel between the total negative port and the charge driving unit.
6. The circuit for a battery management system according to claim 5, characterized in that: The discharge driving unit includes a second switch tube and a fourth resistor; The first end of the fourth resistor is connected to the discharge control pin, the second end of the fourth resistor is connected to the gate of the second switch tube, the source of the second switch tube is connected to the total negative port, and the drain of the second switch tube is connected to the discharge driving unit.
7. The circuit for a battery management system according to claim 3, characterized in that: The circuit for the battery management system further comprises a plurality of equalization modules, the battery pin group comprises a plurality of battery connection pins, and the battery connection interface comprises a plurality of battery cell connection ports; The first end of each of the balancing modules is connected to each of the battery connection pins in a one-to-one correspondence, and the second end of each of the balancing modules is connected to each of the battery cell connection ports in a one-to-one correspondence.
8. The circuit for a battery management system according to claim 7, characterized in that: The balancing module includes a third triode, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first capacitor and a second capacitor; The collector of the third triode is connected to the first end of the fifth resistor, the emitter of the third triode is connected to the battery cell connection port corresponding to the negative electrode of the same single battery cell, the base of the third triode is connected to the first end of the sixth resistor, the second end of the sixth resistor is connected to the second end of the seventh resistor, the second end of the seventh resistor is connected to the battery connection pin corresponding to the negative electrode of the same single battery cell, and the first end of the seventh resistor is connected to the emitter of the third triode; The second end of the fifth resistor is connected to the battery cell connection port corresponding to the positive electrode of the same single battery cell, the first end of the eighth resistor is connected to the second end of the fifth resistor, and the second end of the eighth resistor is connected to the battery connection pin corresponding to the positive electrode of the same single battery cell; The first capacitor is connected between the second end of the eighth resistor and the second end of the seventh resistor; the second capacitor is connected between the second end of the seventh resistor and the ground line.
9. The circuit for a battery management system according to claim 8, characterized in that: The circuit for a battery management system further includes a second diode, a third diode and a ninth resistor; The first end of the ninth resistor is connected to the cell connection port corresponding to the negative electrode of the first single cell, and the 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; The cathode of the second diode is connected to the battery connection pin corresponding to the negative electrode of the first single battery cell, and the anode of the second diode is connected to the total negative port; the cathode of the third diode is connected to the battery connection pin corresponding to the positive electrode of the first single battery cell, and the anode of the third diode is connected to the total negative port.
10. The circuit for a battery management system according to any one of claims 1 to 9, characterized in that: The circuit for the battery management system further includes a current detection module and a temperature detection module; the processing chip further includes a temperature detection pin and a current detection pin; The temperature detection pin is connected to the temperature detection module, and the temperature detection module is used to connect to the temperature sensing probe; The battery detection pin is connected to the current detection module, and the battery detection module is connected between the external connection interface and the battery connection interface.
11. The circuit for a battery management system according to any one of claims 1 to 9, characterized in that: The circuit for the battery management system further includes a communication connection module; the processing chip further includes a communication pin; The communication pin is connected to the communication connection module, and the communication connection module is used to plug in the terminal equipment.
12. The circuit for a battery management system according to any one of claims 1 to 9, characterized in that: The circuit for the battery management system further includes a charging detection unit and a discharging detection unit; the processing chip further includes a charging detection pin and a discharging detection pin; The charging detection pin is connected to the charging detection unit, and the charging detection unit is connected to the charging driving module; The discharge detection pin is connected to the discharge detection unit, and the discharge detection unit is connected to the discharge driving module.
13. A battery system, characterized in that: The invention comprises a battery pack and a circuit for a battery management system as claimed in any one of claims 1 to 12.