Battery management circuit and BMS management system

Abstract

The utility model provides a battery management circuit and a BMS (Battery Management System), and the battery management circuit comprises N battery cells which are connected in series, N management modules and a control module, each battery cell is connected in parallel with one management module; the control module is electrically connected with the N management modules. And the management module is configured to control corresponding battery cell bypasses. And when a certain battery cell is abnormal, the abnormal battery cell can be bypassed through the corresponding management module, so that the continuous operation of the whole battery is not influenced.

Description

Technical Field

[0001] The utility model relates to the field of battery management, and particularly relates to a battery management circuit and a BMS management system. Background Art

[0002] In the related art, in a Battery Management Unit (BMU), when a single cell in a battery pack managed by the BMU is damaged, due to the series connection of the cells in the entire battery, the entire battery will be affected.

[0003] A BMU manages several or even dozens of batteries. When a single cell in the battery is damaged, the power of the entire battery pack will decrease. For devices that need to use the battery for a long time, the usage time will be shortened; at the same time, the internal resistance of the battery pack will increase, resulting in a slower charging speed of the battery pack and requiring a longer time to fully charge the battery pack; it will also cause safety problems such as overheating and leakage of the battery pack, and even cause serious consequences such as fire.

[0004] How to avoid the damaged cell in the battery from affecting the normal use of the battery is an urgent problem to be solved at present. Content of the Utility Model

[0005] The purpose of the utility model is to provide.

[0006] In order to solve the above technical problems, the utility model provides a battery management circuit, including:

[0007] N series-connected cells, N management modules, and a control module;

[0008] Each of the cells is connected in parallel with one of the management modules;

[0009] The control module is electrically connected to the N management modules respectively;

[0010] The management module is configured to control the bypass of the corresponding cell.

[0011] Further, the management module includes: a bypass unit and a voltage detection unit;

[0012] The bypass unit and the voltage detection unit are respectively connected in parallel across the positive and negative electrodes of the corresponding cell;

[0013] Both the bypass unit and the voltage detection unit are electrically connected to the control module;

[0014] The control module is configured to control the working state of the corresponding bypass unit according to the detected voltage information of the cell.

[0015] Further, the bypass unit includes: a first switching transistor;

[0016] The first pole and the second pole of the first switching transistor are electrically connected to the positive electrode and the negative electrode of the corresponding battery cell respectively;

[0017] The third pole of the first switching transistor is electrically connected to the control end of the control transistor.

[0018] Further, the voltage detection unit includes: a first current limiting resistor;

[0019] One end of the first current limiting resistor is connected to the positive electrode of the corresponding battery cell, and the other end is electrically connected to the detection end of the control module;

[0020] The control module is configured to obtain the voltage information of the corresponding battery cell according to the received current information.

[0021] Further, the voltage detection unit further includes: a filter capacitor;

[0022] One end of the filter capacitor is electrically connected between the first current limiting resistor and the detection end of the control transistor, and the other end is grounded.

[0023] Further, the voltage detection unit further includes: a zener diode;

[0024] Both ends of the zener diode are electrically connected to the positive and negative electrodes of the corresponding battery cell respectively.

[0025] Further, a protection capacitor is connected in parallel across both ends of the zener diode.

[0026] Further, the management module further includes: a balancing unit;

[0027] The balancing unit is connected in parallel across the positive and negative electrodes of the corresponding battery cell;

[0028] The control module is configured to control the working state of the corresponding balancing unit according to the detected voltage information of the battery cell.

[0029] Further, the balancing unit includes: a second switching transistor, a discharging resistor, and a second current limiting resistor;

[0030] The first pole of the second switching transistor is electrically connected to the positive electrode of the corresponding battery cell;

[0031] The second pole of the second switching transistor is electrically connected to the negative electrode of the corresponding battery cell after being connected in series with the discharging resistor;

[0032] The third pole of the second switching transistor is electrically connected to the control end of the control module through the second current limiting resistor.

[0033] The present invention also provides a BMS management system, including:

[0034] A total controller and at least one battery cluster;

[0035] At least one battery management circuit as described above is provided in the battery cluster;

[0036] The total controller is electrically connected to the control module.

[0037] The beneficial effect of the present utility model is that the present utility model provides a battery management circuit and a BMS management system. Among them, the battery management circuit includes: N series-connected battery cells, N management modules, and a control module; each of the battery cells is connected in parallel with one of the management modules; the control module is electrically connected to the N management modules respectively; the management module is configured to control the bypass of the corresponding battery cell. When a certain battery cell is abnormal, the abnormal battery cell can be bypassed through the corresponding management module, so as not to affect the continued operation of the entire battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0039] Figure 1 is a schematic block diagram of the battery management circuit provided by the embodiment of the present utility model.

[0040] Figure 2 is a circuit diagram of the battery management circuit provided by the embodiment of the present utility model.

[0041] In the figure: Q1, the first switching tube; Q2, the second switching tube; R1, the first current-limiting resistor; R2, the second current-limiting resistor; R3, the discharging resistor; C1, the filtering capacitor; C2, the protection capacitor; Z1, the voltage-regulating diode. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] The present utility model will now be further described in detail in conjunction with the drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present utility model in a schematic manner, so they only show the components related to the present utility model.

[0043] Embodiment

[0044] Please refer to Figure 1 - Figure 2 , at least one embodiment provides a battery management circuit, including: N series-connected battery cells, N management modules, and a control module; each of the battery cells is connected in parallel with one of the management modules; the control module is electrically connected to the N management modules respectively; the management module is configured to control the bypass of the corresponding battery cell. When a certain battery cell is abnormal, the abnormal battery cell can be bypassed through the corresponding management module, so as not to affect the continued operation of the entire battery.

[0045] Among them, the management module includes: a bypass unit and a voltage detection unit; the bypass unit and the voltage detection unit are respectively connected in parallel to the positive and negative electrodes of the corresponding battery cell; both the bypass unit and the voltage detection unit are electrically connected to the control module; the control module is configured to control the working state of the corresponding bypass unit according to the detected voltage information of the battery cell.

[0046] Specifically, the bypass unit includes: a first switching tube Q1; the first pole and the second pole of the first switching tube Q1 are respectively electrically connected to the positive electrode and the negative electrode of the corresponding battery cell; the third pole of the first switching tube Q1 is electrically connected to the control end of the control tube.

[0047] When the control module receives that the voltage information of the corresponding battery cell is abnormal, it sends a bypass signal to the third pole of the first switching tube Q1, thereby controlling the first switching tube Q1 to conduct, and thus bypassing the corresponding battery cell.

[0048] In this embodiment, the voltage detection unit includes: a first current-limiting resistor R1; one end of the first current-limiting resistor R1 is connected to the positive electrode of the corresponding battery cell, and the other end is electrically connected to the detection end of the control module; the control module is configured to obtain the voltage information of the corresponding battery cell according to the received current information. By setting the first current-limiting resistor R1 to limit the current, damage to the control module is avoided.

[0049] In this embodiment, the voltage detection unit further includes: a filtering capacitor C1; one end of the filtering capacitor C1 is electrically connected between the first current-limiting resistor R1 and the detection end of the control tube, and the other end is grounded. Through the filtering capacitor C1, the electrical signal passing through the first current-limiting resistor R1 is filtered to remove impurities, improving the detection accuracy.

[0050] In this embodiment, the voltage detection unit further includes: a voltage-regulator diode Z1; both ends of the voltage-regulator diode Z1 are respectively electrically connected to the positive and negative electrodes of the corresponding battery cell.

[0051] Among them, a protection capacitor C2 is connected in parallel across both ends of the voltage-regulator diode Z1.

[0052] In this embodiment, the management module further includes: an equalization unit; the equalization unit is connected in parallel to the positive and negative electrodes of the corresponding battery cell; the control module is configured to control the working state of the corresponding equalization unit according to the detected voltage information of the battery cell. Specifically, when it is detected that the voltage information of the battery cell exceeds the threshold of the equalization voltage, the equalization unit starts to work and discharges the battery cell.

[0053] In this embodiment, the balancing unit includes: a second switching transistor Q2, a discharging resistor R3, and a second current-limiting resistor R2; the first pole of the second switching transistor Q2 is electrically connected to the positive electrode of the corresponding battery cell; the second pole of the second switching transistor Q2 is connected in series with the discharging resistor R3 and then electrically connected to the negative electrode of the corresponding battery cell; the third pole of the second switching transistor Q2 is electrically connected to the control terminal of the control module through the second current-limiting resistor R2.

[0054] At least one embodiment further provides a BMS management system, including: a master controller and at least one battery cluster; at least one battery management circuit as described above is provided in the battery cluster; the master controller is electrically connected to the control module. When a certain battery cell is abnormal, the abnormal battery cell can be bypassed through the corresponding management module, so as not to affect the continued operation of the entire battery.

[0055] In summary, the present invention provides a battery management circuit and a BMS management system. The battery management circuit includes: N series-connected battery cells, N management modules, and a control module; each battery cell is connected in parallel with one management module; the control module is electrically connected to the N management modules respectively; the management module is configured to control the bypass of the corresponding battery cell. When a certain battery cell is abnormal, the abnormal battery cell can be bypassed through the corresponding management module, so as not to affect the continued operation of the entire battery.

[0056] Each device (components without specific structures) selected in this application is a general standard component or a component known to those skilled in the art. Its structure and principle can be known by those skilled in the art through technical manuals or obtained through conventional experimental methods. Moreover, the software programs involved in this application are all prior arts, and this application does not involve any improvement to the software programs.

[0057] In the description of the embodiments of the present invention, unless otherwise clearly defined and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0058] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0059] In several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there can be other division methods in actual implementation. For another example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection between each other can be through some communication interfaces. The indirect coupling or communication connection of the device or unit can be in an electrical, mechanical, or other form.

[0060] The units described as separate components may or may not be physically separated. The components shown as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0061] In addition, in each embodiment of the present utility model, the functional units can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit.

[0062] Taking the above ideal embodiments of the present utility model as an inspiration, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this utility model. The technical scope of this utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A battery management circuit, characterized in that: include: N battery cells connected in series, N management modules and control modules; Each of the battery cells is connected in parallel with one of the management modules; The control module is electrically connected to the N management modules respectively; The management module is configured to control the bypass of the corresponding battery cell; The management module includes: a bypass unit and a voltage detection unit; The bypass unit and the voltage detection unit are respectively connected in parallel to the positive and negative electrodes of the corresponding battery cells; The bypass unit and the voltage detection unit are both electrically connected to the control module; The control module is configured to control the working state of the corresponding bypass unit according to the detected voltage information of the battery cell; The bypass unit includes: a first switch tube Q1; The first electrode and the second electrode of the first switch tube Q1 are electrically connected to the positive electrode and the negative electrode of the corresponding battery cell respectively; The third electrode of the first switch tube Q1 is electrically connected to the control end of the control tube; The voltage detection unit includes: a first current limiting resistor R1; One end of the first current limiting resistor R1 is connected to the positive electrode cell of the corresponding cell, and the other end is electrically connected to the detection end of the control module; The control module is configured to obtain voltage information of the corresponding battery cell according to the received current information.

2. The battery management circuit according to claim 1, characterized in that: The voltage detection unit further includes: a filter capacitor C1; One end of the filter capacitor C1 is electrically connected to the first current limiting resistor R1 and the detection end of the control tube, and the other end is grounded.

3. The battery management circuit according to claim 1, characterized in that: The voltage detection unit further includes: a voltage stabilizing diode Z1; The two ends of the voltage stabilizing diode Z1 are electrically connected to the positive and negative electrodes of the corresponding battery cells respectively.

4. The battery management circuit according to claim 3, characterized in that: The two ends of the voltage stabilizing diode Z1 are connected in parallel with a protection capacitor C2.

5. The battery management circuit according to claim 1, characterized in that: The management module further includes: a balancing unit; The balancing unit is connected in parallel to the positive and negative electrodes of the corresponding battery cells; The control module is configured to control the working state of the corresponding balancing unit according to the detected voltage information of the battery cell.

6. The battery management circuit according to claim 5, characterized in that: The balancing unit includes: a second switch tube Q2, a discharge resistor R3 and a second current limiting resistor R2; The first electrode of the second switch tube Q2 is electrically connected to the positive electrode of the corresponding battery cell; The second electrode of the second switch tube Q2 is electrically connected to the negative electrode of the corresponding battery cell after being connected in series with the discharge resistor R3; The third electrode of the second switch tube Q2 is electrically connected to the control end of the control module through a second current limiting resistor R2.

7. A BMS management system, characterized in that: include: a master controller and at least one battery cluster; The battery cluster is provided with at least one battery management circuit as claimed in any one of claims 1 to 6; The master controller is electrically connected to the control module.

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