Energy storage battery management circuit

Abstract

The utility model discloses an energy storage battery management circuit, which comprises a main loop positive pole control unit, the main loop positive pole control unit is respectively connected with a battery pack and a positive pole of an internal power supply unit, when the battery pack is fully charged, the main loop positive pole control unit is used for switching to a discharge state in real time; when the battery pack is discharged, the main loop positive pole control unit is used for switching to a charging state in real time, a negative pole of the internal power supply unit is connected with a low-voltage cut-off unit, and the low-voltage cut-off unit is used for cutting off input of the internal power supply unit when the voltage of the battery pack is lower than a preset value. And the main loop anode control unit, the low-voltage cut-off unit and the internal power supply unit are electrically connected with the main control module respectively.

Description

Technical Field

[0001] The utility model relates to the field of battery circuits, and more specifically to an energy storage battery management circuit. Background Art

[0002] An energy storage battery management system (energy storage BMS) is an electronic device applied to energy storage batteries. Its function is to detect, control, and manage battery packs to ensure that the battery packs operate in a safe, stable, and efficient state. Currently, the above functions of the energy storage battery management system are mainly realized through an energy storage battery management circuit built in the battery pack.

[0003] In the existing energy storage battery management circuit, when the battery pack is charging or discharging, when the battery pack is fully charged or when the battery pack is completely discharged, it cannot automatically and real-time switch the charging and discharging states of the battery pack, thus affecting the lifespan of the battery pack. Summary of the Utility Model

[0004] To solve the above problems, the utility model provides an energy storage battery management circuit, including a main circuit positive control unit. The main circuit positive control unit is respectively connected to the positive poles of the battery pack and the internal power supply unit. When the battery pack is fully charged, the main circuit positive control unit is used to switch to the discharge state in real time. When the battery pack is completely discharged, the main circuit positive control unit is used to switch to the charging state in real time. The negative pole of the battery pack and the internal power supply unit are connected with a low-voltage cut-off unit. The low-voltage cut-off unit is used to cut off the input of the internal power supply unit when the voltage of the battery pack is lower than a preset value. The main circuit positive control unit, the low-voltage cut-off unit, and the internal power supply unit are respectively electrically connected to the main control module.

[0005] Furthermore, the main circuit positive control unit includes a first discharge freewheeling diode and a first charging freewheeling diode. The negative poles of the first discharge freewheeling diode and the first charging freewheeling diode are connected to the positive pole of the internal power supply unit. The first discharge freewheeling diode and the first charging freewheeling diode are respectively connected in parallel with a first charging relay and a first discharge relay.

[0006] Furthermore, the first discharge freewheeling diode and the first charging freewheeling diode are also connected in parallel with a pre-charge relay and a pre-charge resistor, and the pre-charge relay and the pre-charge resistor are connected in series.

[0007] Furthermore, the main circuit positive control unit is connected with a partition unit. The partition unit is electrically connected to the main control module. The partition unit includes a partition switch and a shunt release.

[0008] Furthermore, the low-voltage cut-off unit includes a self-resetting push-button switch and a sleep relay. The self-resetting push-button switch is connected to the negative pole of the internal power supply unit, and the sleep relay is connected in parallel with the self-resetting push-button switch.

[0009] Furthermore, the model of the main control module is the RCU-01K8 series.

[0010] Furthermore, it also includes a main circuit negative pole control unit, which is used to independently and separately control both sides of the neutral point N terminal of the battery pack.

[0011] Furthermore, the main circuit negative pole control unit includes a second discharge freewheeling diode and a second charging freewheeling diode. The positive poles of the first discharge freewheeling diode and the first charging freewheeling diode are connected to the negative pole of the internal power supply unit. The second discharge freewheeling diode and the second charging freewheeling diode are respectively connected in parallel with a second charging relay and a second discharge relay.

[0012] Furthermore, a Hall inductor and a fuse are also connected between the main circuit negative pole control unit and the battery pack.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] 1. The present utility model independently controls the charging and discharging of the battery pack through the main circuit positive pole control unit. When the battery is fully charged, only the charging relay is disconnected to stop charging. At this time, the battery pack can discharge normally through the discharge relay and the discharge freewheeling diode. Thus, the real-time switching of the battery charging state to the discharging state within 0 seconds after being fully charged is realized. Similarly, when the battery is discharged completely, only the discharge relay is disconnected to stop discharging. At this time, the battery pack can charge normally through the charging relay and the charging freewheeling diode. Thus, the real-time switching of the battery discharging state to the charging state within 0 seconds after being discharged completely is realized.

[0015] 2. In addition, the present utility model can avoid the over-discharge damage of the battery cells inside the battery pack caused by the self-power consumption of the system when the battery cells of the battery pack are at low voltage through the low-voltage cut-off unit.

[0016] The additional aspects and advantages of the present utility model will be given in the following description part, and some will become obvious from the following description, or will be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 Schematic diagram of the first implementation mode of the energy storage battery management circuit of the present invention;

[0019] Figure 2 Schematic diagram of the main circuit positive control unit of the energy storage battery management circuit of the present invention;

[0020] Figure 3 Schematic diagram of the isolation unit of the energy storage battery management circuit of the present invention;

[0021] Figure 4 Schematic diagram of the low-voltage cut-off unit of the energy storage battery management circuit of the present invention;

[0022] Figure 5 Schematic diagram of the second implementation mode of the energy storage battery management circuit of the present invention;

[0023] Figure 6 Schematic diagram of the main circuit negative control unit of the energy storage battery management circuit of the present invention;

[0024] Figure 7 Schematic diagram of the product structure after assembling components according to the new energy storage battery management circuit of the present invention. Specific implementation mode

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0026] The present invention will be described in more detail. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. It should be noted that when an element is expressed as "fixed to" another element, it can be directly on the other element, or there can be one or more intermediate elements therebetween. When an element is expressed as "connected to" another element, it can be directly connected to the other element, or there can be one or more intermediate elements therebetween.

[0027] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. is usually 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. Without contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present utility model; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself. In the description of the present utility model, it should be noted that the use of words such as "first", "second", etc. to limit the components is only for the convenience of distinguishing the corresponding components. Without additional statement, the above words have no special meaning. Therefore, it should not be construed as a limitation on the protection scope of the present utility model. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically defined.

[0028] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in this specification in the description of the present utility model are only for the purpose of describing specific embodiments and are not used to limit the present utility model.

[0029] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0030] Now, with reference to the drawings, a further description will be made of the preferred embodiments of the present utility model. In combination with Figures 1 to 4 , and also Figure 7As shown, the energy storage battery management circuit includes a main circuit positive control unit 100. The main circuit positive control unit 100 is respectively connected to the positive electrodes of the battery pack 200 and the internal power supply unit 300. When the battery pack 200 is fully charged, the main circuit positive control unit 100 is used to switch to the discharge state in real time. When the battery pack 200 is discharged, the main circuit positive control unit 100 is used to switch to the charging state in real time. A low-voltage cut-off unit 400 is connected to the negative electrode of the internal power supply unit 300. The low-voltage cut-off unit 400 is used to cut off the input of the internal power supply unit 300 when the voltage of the battery pack 200 is lower than a preset value. The main circuit positive control unit 100, the low-voltage cut-off unit 400, and the internal power supply unit 300 are respectively electrically connected to the main control module 500. As can be seen from the above embodiments, the present utility model independently controls the charging and discharging of the battery pack 200 through the main circuit positive control unit 100. When the battery is fully charged, only the charging relay is disconnected to stop charging. At this time, the battery pack 200 can discharge normally through the discharge relay and the discharge freewheeling diode. Thus, the real-time switching of the battery charging state to the discharge state at 0 seconds after being fully charged is achieved. Similarly, when the battery is discharged, only the discharge relay is disconnected to stop discharging. At this time, the battery pack 200 can charge normally through the charging relay and the charging freewheeling diode. Thus, the real-time switching of the battery discharge state to the charging state at 0 seconds after being discharged is achieved. In addition, the present utility model can avoid over-discharge damage to the battery cells inside the battery pack 200 caused by the self-power consumption of the system when the battery cells of the battery pack 200 are at low voltage through the low-voltage cut-off unit 400.

[0031] Furthermore, based on the above embodiments, as Figure 2As shown, the positive main circuit control unit 100 includes a first discharge freewheeling diode P1 and a first charging freewheeling diode P2. The negative electrodes of the first discharge freewheeling diode P1 and the first charging freewheeling diode P2 are connected to the positive electrode of the internal power supply unit 300. The first charging relay D01H and the first discharge relay D02H are respectively connected in parallel with the first discharge freewheeling diode P1 and the first charging freewheeling diode P2. When this embodiment works, when the battery is fully charged, only the first charging relay D01H is disconnected to stop charging. At this time, the battery pack 200 can discharge normally through the first discharge relay D02H and the first discharge freewheeling diode P1. Thus, the real-time switching from the battery charging state to the discharging state after being fully charged is realized. Similarly, when the battery is completely discharged, only the first discharge relay D02H is disconnected to stop discharging. At this time, the battery pack 200 can charge normally through the first charging relay D01H and the first charging freewheeling diode P2. Thus, the real-time switching from the battery discharging state to the charging state after being completely discharged is realized. At the same time, the positive main circuit control unit 100 is respectively connected to the positive electrodes of the battery pack 200 and the internal power supply unit 300, and is connected between the first discharge freewheeling diode P1 and the first charging freewheeling diode P2. In this way, there are two ways to obtain power for the internal power supply: one is to obtain power from the BAT+ terminal on the battery side through the discharge freewheeling diode, and the other is to obtain power from the P+ terminal on the output side through the first charging freewheeling diode P2.

[0032] Furthermore, on the basis of the above-mentioned embodiment, as Figure 2 shown, a pre-charge relay D03H and a pre-charge resistor R1 are also connected in parallel with the first discharge freewheeling diode P1 and the first charging freewheeling diode P2. The pre-charge relay D03H and the pre-charge resistor R1 are connected in series. In this way, before the first charging relay D01H and the first discharge relay D02H are closed, the pre-charge relay D03H is first closed, and soft start is carried out through the pre-charge resistor R1. After the pre-charge is completed, the first charging relay D01H and the first discharge relay D02H are then closed.

[0033] Furthermore, on the basis of the above-mentioned embodiment, in combination with Figure 2 and Figure 3 shown, the positive main circuit control unit 100 is connected to a partition unit 600. The partition unit 600 is electrically connected to the main control module 500. The partition unit 600 includes a partition switch SW1 and a shunt trip T1. The isolation module serves to cut off the input and output of the battery pack 200. In case of a specific fault, such as a relay adhesion fault, etc., the main control module 500 will drive the shunt trip T1 to disconnect the isolation switch and cut off the input and output of the battery main circuit, playing a role in protecting the battery pack 200.

[0034] Furthermore, on the basis of the above-mentioned embodiment, as Figure 2and Figure 4 As shown, the low-voltage cut-off unit 400 includes a self-resetting push-button switch SW2, which cooperates with a sleep relay D04H. The self-resetting push-button switch SW2 is connected to the negative pole of the internal power supply unit 300, and the sleep relay D04H is connected in parallel with the self-resetting push-button switch SW2. When the self-resetting push-button switch SW2 is pressed, the input of the internal power supply unit 300 is conducted, the system starts to power on and run, and the sleep relay D04H closes; after the push-button switch is released, the self-resetting push-button switch SW2 disconnects, and the internal power supply unit 300 is powered through the sleep relay D04H side; that is, when the voltage of a battery cell inside the battery pack 200 is lower than a specific low-voltage value (which can be set), the system disconnects the sleep relay D04H to cut off the power supply input of the internal power supply unit 300. This can prevent the battery cells inside the battery pack 200 from being damaged due to over-discharge caused by the self-power consumption of the system itself when the battery cells are at low voltage.

[0035] Furthermore, on the basis of the above embodiments, as Figure 1 shown, the model of the main control module 500 is the RCU-01K8 series. Specifically, it can be either of the two models RCU-01K8CCH1 or RCU-01K8CCNK1. The specific connection method between the main control module 500 and the main circuit positive control unit 100, the low-voltage cut-off unit 400, and the internal power supply unit 300 is the inherent connection method of the chip pins of the module, which will not be elaborated here.

[0036] Furthermore, on the basis of the above embodiments, the present utility model also provides a second implementation manner, as Figure 5 and Figure 6As shown, the difference from the first embodiment is that it further includes a main circuit negative control unit 700. The main circuit negative control unit 700 includes a second discharge freewheeling diode P3 and a second charge freewheeling diode P4. The anodes of the first discharge freewheeling diode P1 and the first charge freewheeling diode P2 are connected to the negative pole of the internal power supply unit 300. The second discharge freewheeling diode P3 and the second charge freewheeling diode P4 are respectively connected in parallel with a second charge relay D05L and a second discharge relay D07L. The main circuit negative control unit 700 is used to independently and separately control both sides of the neutral point N of the battery pack 200: when the batteries in the "BAT-" - N half of the battery pack 200 are fully charged, the second charge relay D05L is cut off; when the batteries are discharged, the second discharge relay D07L is cut off; when the batteries in the N - "BAT+" half of the battery pack 200 are fully charged, the first charge relay D01H is cut off; when the batteries are discharged, the first discharge relay D02H is cut off. Since the negative pole of the internal power supply unit 300 is connected between the second discharge freewheeling diode P3 and the second charge freewheeling diode P4, there are two ways to obtain power for self-power supply: one is to obtain power from BAT- on the battery side through the second discharge freewheeling diode P3, and the other is to obtain power from P- on the output side through the second charge freewheeling diode P4.

[0037] Furthermore, on the basis of the above embodiments, a Hall inductor T2 and a fuse T3 are also connected between the main circuit negative control unit 700 and the battery pack 200.

[0038] Details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention.

Claims

1. Energy storage battery management circuit, characterized in that: It includes a main circuit positive pole control unit, which is respectively connected to the positive poles of the battery pack and the internal power supply unit. When the battery pack is fully charged, the main circuit positive pole control unit is used to switch to the discharge state in real time. When the battery pack is discharged, the main circuit positive pole control unit is used to switch to the charging state in real time. A low-voltage cut-off unit is connected to the negative pole of the internal power supply unit. The low-voltage cut-off unit is used to cut off the input of the internal power supply unit when the battery pack voltage is lower than a preset value. The main circuit positive pole control unit, the low-voltage cut-off unit and the internal power supply unit are respectively electrically connected to the main control module.

2. The energy storage battery management circuit according to claim 1, characterized in that: The main circuit positive pole control unit includes a first discharge freewheeling diode and a first charging freewheeling diode, the cathode of the first discharge freewheeling diode and the cathode of the first charging freewheeling diode are connected to the positive pole of the internal power supply unit, and the first discharge freewheeling diode and the first charging freewheeling diode are respectively connected in parallel with a first charging relay and a first discharge relay.

3. The energy storage battery management circuit according to claim 2, characterized in that: The first discharge freewheeling diode and the first charge freewheeling diode are further connected in parallel with a pre-charging relay and a pre-charging resistor, and the pre-charging relay and the pre-charging resistor are connected in series.

4. The energy storage battery management circuit according to claim 3, characterized in that: The main circuit positive pole control unit is connected to an isolating unit, which is electrically connected to the main control module. The isolating unit includes an isolating switch and a shunt release.

5. The energy storage battery management circuit according to claim 4, characterized in that: The low-voltage cutoff unit comprises a self-resetting push button switch and a dormant relay, wherein the self-resetting push button switch is connected to the negative pole of the internal power supply unit, and the dormant relay is connected in parallel with the self-resetting push button switch.

6. The energy storage battery management circuit according to claim 5, characterized in that: The main control module model is RCU-01K8 series.

7. The energy storage battery management circuit according to claim 6, characterized in that: It also includes a main circuit negative pole control unit, which is used to independently and separately control the two sides of the neutral point N end of the battery pack.

8. The energy storage battery management circuit according to claim 7, characterized in that: The main circuit negative pole control unit includes a second discharge freewheeling diode and a second charging freewheeling diode, the positive pole of the first discharge freewheeling diode and the positive pole of the first charging freewheeling diode are connected to the negative pole of the internal power supply unit, and the second discharge freewheeling diode and the second charging freewheeling diode are respectively connected in parallel with a second charging relay and a second discharge relay.

9. The energy storage battery management circuit according to claim 8, characterized in that: A Hall sensor and a fuse are also connected between the main circuit negative pole control unit and the battery pack.

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