Charging and discharging circuit and mobile emergency energy storage system
By setting up diodes and switches in the charge and discharge circuit and adopting a staged charge and discharge method, the problem of arc drawing in the mobile emergency energy storage system is solved, and the stability and safety of the charge and discharge circuit are improved.
Patent Information
- Application Number
- CN202422290821.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-19
- Publication Date
- 2025-09-02
- Estimated Expiration
- 2034-09-19
AI Technical Summary
Current mobile emergency energy storage systems are prone to arc drawing during charging and discharging, affecting the stability of the charging and discharging circuit.
The staged charging and discharging method is adopted, by setting up diodes and switches on the charging and discharging branches, first conducting through a small current path, and then gradually transitioning to a large current path to reduce the arc drawing phenomenon caused by sudden current changes.
It improves the stability and safety of the charge and discharge circuit, reduces the risk of arc pulling, and ensures the stability and safety of the charge and discharge process.
Smart Images
Figure CN223297380U_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the field of mobile emergency energy storage technology, and in particular relates to a charging and discharging circuit and a mobile emergency energy storage system. Background Art
[0002] With the rapid development of the electric vehicle industry, the penetration rate of electric vehicles has increased year by year, especially in urban public transportation, logistics, and private vehicles. However, the range and charging efficiency of electric vehicles have always been key factors restricting their widespread adoption. The need for rapid recharging of electric vehicles is particularly urgent during emergency rescue, emergencies, or long-distance travel.
[0003] Currently, mobile emergency energy storage systems are often used to recharge electric vehicles and other electrical devices. However, these systems are prone to arcing during the charging and discharging process, which in turn affects the stability of the charging and discharging circuits.
[0004] Therefore, how to improve the stability of the charge and discharge circuit is a problem that those skilled in the art currently need to solve. Utility Model Content
[0005] The purpose of this application is to provide a charging and discharging circuit and a mobile emergency energy storage system, aiming to solve the problem of low stability of current charging and discharging circuits.
[0006] A first aspect of an embodiment of the present application provides a charge-discharge circuit, comprising:
[0007] Energy storage unit, used to store and release electrical energy;
[0008] a charging unit, connected to the energy storage unit and used to charge the energy storage unit;
[0009] a first charging branch, one end of the first charging branch being connected to the energy storage unit and the other end being connected to the charging unit;
[0010] a second charging branch, the second charging branch and the first charging branch being connected in parallel between the energy storage unit and the charging unit;
[0011] In which, a first diode is provided on the first charging branch, the positive electrode of the first diode is connected to the charging unit, and the negative electrode of the first diode is connected to the energy storage unit; during the conduction process between the energy storage unit and the charging unit, the first charging branch is conducted before the second charging branch.
[0012] In some embodiments of the present application, a first switch element is provided on the first charging branch, and a second switch element is provided on the second charging branch. During the conduction process between the energy storage unit and the charging unit, the first switch element is closed before the second switch element.
[0013] In some embodiments of the present application, the charging and discharging circuit further includes:
[0014] a discharge unit, connected to the energy storage unit and used to release the electrical energy of the energy storage unit;
[0015] a first discharging branch, one end of the first discharging branch being connected to the energy storage unit and the other end being connected to the discharging unit;
[0016] a second discharge branch, the second discharge branch and the first discharge branch being connected in parallel between the energy storage unit and the discharge unit;
[0017] In which, a second diode is provided on the first discharge branch, the positive electrode of the second diode is connected to the energy storage unit, and the negative electrode of the second diode is connected to the discharge unit; during the conduction process of the energy storage unit and the discharge unit, the first discharge branch is conducted before the second discharge branch.
[0018] In some embodiments of the present application, a third switch is further provided on the first discharge branch, and a fourth switch is provided on the second discharge branch. During the conduction process between the energy storage unit and the discharge unit, the third switch is closed before the fourth switch.
[0019] In some embodiments of the present application, there are multiple energy storage units, and multiple energy storage units are connected to the charging unit and the discharging unit, and the first charging branch and the second charging branch are provided between each of the energy storage units and the charging unit, and the first discharging branch and the second discharging branch are provided between each of the energy storage units and the discharging unit.
[0020] In some embodiments of the present application, the energy storage unit includes a first energy storage unit and a second energy storage unit, and the charge and discharge circuit further includes a main control unit, which is used to detect the first voltage of the first energy storage unit and the second voltage of the second energy storage unit;
[0021] When the first voltage is lower than the second voltage, the main control unit controls the first energy storage unit to be connected to the charging unit before the second energy storage unit until the first voltage is increased to the second voltage; or, the main control unit controls the second energy storage unit to be connected to the discharging unit until the second voltage is reduced to the first voltage.
[0022] In some embodiments of the present application, the charging and discharging circuit further includes
[0023] A first access port, the first access port is used to access a DC power supply;
[0024] a second access port, the second access port being used to access an AC power source, the first access port and the second access port both being connected to the energy storage unit;
[0025] A main control unit is used to connect the energy storage unit with the first access port / the second access port.
[0026] In some embodiments of the present application, the discharge unit is connected to the second access port, and the discharge unit has a discharge port, which is configured to be connected to the first access port when the AC power supply is connected to the second access port to provide AC power to the energy storage unit.
[0027] In some embodiments of the present application, a fifth switch is provided between the discharge unit and the energy storage unit. The fifth switch is used to disconnect before the first access port is connected to the DC power supply or before the second access port is connected to the AC power supply, and to close before the energy storage unit and the discharge unit are connected.
[0028] In a second aspect, the present application also provides a mobile emergency energy storage system, characterized in that it includes the above-mentioned charging and discharging circuit.
[0029] Compared with the prior art, the embodiments of the present invention have the following beneficial effects: the above-mentioned charging and discharging circuit and mobile emergency energy storage system include an energy storage unit, a charging unit, a first charging branch and a second charging branch, the energy storage unit is used to store and release electrical energy; the charging unit is connected to the energy storage unit and is used to charge the energy storage unit; one end of the first charging branch is connected to the energy storage unit, and the other end is connected to the charging unit; the second charging branch is connected in parallel with the first charging branch between the energy storage unit and the charging unit; a first diode is provided on the first charging branch, the positive electrode of the first diode is connected to the charging unit, and the negative electrode of the first diode is connected to the energy storage unit; during the conduction process between the energy storage unit and the charging unit, the first charging branch is turned on before the second charging branch; that is, during the charging process, due to the provision of the first diode on the first charging branch, a small current can be charged first through the first charging branch, and then a large current can be charged through the second charging branch, which is beneficial to reducing the contact arcing generated during the conduction process between the energy storage unit and the charging unit, thereby facilitating the improvement of the stability of the charging and discharging circuit and the mobile emergency energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS
[0030] Figure 1 A schematic diagram of the circuit structure of a charge and discharge circuit provided in one embodiment of the present application;
[0031] Figure 2 A schematic diagram of the circuit structure of a charge and discharge circuit provided in another embodiment of the present application;
[0032] Figure 3 A schematic diagram of the circuit structure of a charging and discharging circuit provided in yet another embodiment of the present application.
[0033] Specific element symbol description: 2-fifth switch element, 8-first access port, 16-second access port, 18-discharge unit, 19-charge unit, 21-first diode, 22-second diode, 23-first switch element, 24-second switch element, 25-third switch element, 26-fourth switch element. DETAILED DESCRIPTION
[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.
[0035] It should be noted that when an element is referred to as being “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.
[0036] It should be understood that the terms "length", "width", "up", "down", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.
[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.
[0038] See also Figure 1 , Figure 1 The figure shows a schematic diagram of the circuit structure of the charging and discharging circuit provided in this embodiment. Figure 11# is the energy storage unit, the charging positive terminal is the charging unit 19, and 20 is the total negative terminal, which is connected to the negative terminal of the energy storage unit. The charge and discharge circuit of this embodiment includes an energy storage unit, a charging unit 19, a first charging branch, and a second charging branch. The energy storage unit is used to store and release electrical energy; the charging unit 19 is connected to the energy storage unit and is used to charge the energy storage unit; one end of the first charging branch is connected to the energy storage unit, and the other end is connected to the charging unit 19; the second charging branch is connected in parallel with the first charging branch between the energy storage unit and the charging unit 19; a first diode 21 is provided on the first charging branch, the positive electrode of the first diode 21 is connected to the charging unit 19, and the negative electrode of the first diode 21 is connected to the energy storage unit; when the energy storage unit and the charging unit 19 are turned on, the first charging branch is turned on before the second charging branch.
[0039] It is understandable that during the charging process, when the charging unit 19 starts to supply power, the first charging branch will first establish a conduction path, allowing the charging current to flow smoothly into the energy storage unit. Due to the conduction characteristics of the first diode 21, it is possible to avoid arcing caused by sudden current changes. As the charging process progresses, when the current of the first charging branch gradually stabilizes, the second charging branch is gradually turned on for high-current charging. This staged charging method not only improves the charging efficiency, but also significantly reduces the risk of arcing, ensuring the stability and safety of the charging and discharging circuit.
[0040] In the current charging and discharging circuit, arcing will occur during the conduction process. However, in the present application, since a first diode 21 is provided on the first charging branch during the charging process, small current charging can be performed through the first charging branch first, and then large current charging can be performed through the second charging branch, which is beneficial to reducing the contact arcing generated during the conduction process of the energy storage unit and the charging unit 19, and thus beneficial to improving the stability of the charging and discharging circuit and the mobile emergency energy storage system.
[0041] In some embodiments, after the second charging branch is turned on, the first charging branch is turned off, or after the second charging branch is turned on, the first charging branch is turned on to achieve split charging.
[0042] In some embodiments of this application, please continue to refer to Figure 1 In this embodiment, a first switch 23 is provided on the first charging branch, and a second switch 24 is provided on the second charging branch. During the conduction process between the energy storage unit and the charging unit 19, the first switch 23 is closed before the second switch 24.
[0043] It should be explained that in the initial state, the first switch 23 and the second switch 24 are both in the disconnected state, ensuring that there is no direct current path between the energy storage unit and the charging unit 19 before charging starts. When the charging process starts, the first switch 23 is first controlled to close. Since the first diode 21 is also provided on the first charging branch, when the first switch 23 is closed and the charging unit 19 starts to supply power, if the forward voltage is large enough, the first diode 21 will be forward-conducted, allowing current to flow into the energy storage unit through the first charging branch. At this stage, since only the first charging branch is turned on and the current is limited by the diode, the occurrence of arcing can be effectively avoided.
[0044] In some embodiments of this application, please continue to refer to Figure 1 The charge and discharge circuit of this embodiment further includes a discharge unit 18, a first discharge branch, and a second discharge branch. The discharge unit 18 is connected to the energy storage unit and is used to release the electrical energy of the energy storage unit. One end of the first discharge branch is connected to the energy storage unit, and the other end is connected to the discharge unit 18. The second discharge branch is connected in parallel with the first discharge branch between the energy storage unit and the discharge unit 18. A second diode 22 is provided on the first discharge branch, the positive electrode of the second diode 22 is connected to the energy storage unit, and the negative electrode of the second diode 22 is connected to the discharge unit 18. During the conduction process of the energy storage unit and the discharge unit 18, the first discharge branch is turned on before the second discharge branch.
[0045] It should be noted that during the conduction process of the energy storage unit and discharge unit 18, the first discharge branch is turned on before the second discharge branch. At the beginning of the discharge process, a current path is quickly established through the first discharge branch. The presence of the second diode 22 also reduces potential problems caused by sudden current changes. After the low current in the first discharge branch is discharged, the second discharge branch is turned on to discharge the high current.
[0046] In some embodiments of this application, please continue to refer to Figure 1 In this embodiment, a third switch 25 is further provided on the first discharge branch, and a fourth switch 26 is provided on the second discharge branch. During the conduction process of the energy storage unit and the discharge unit 18, the third switch 25 is closed before the fourth switch 26.
[0047] It should be explained that before the discharge process begins, the third switch 25 and the fourth switch 26 are both in the off state to ensure that there is no direct current path between the energy storage unit and the discharge unit 18. When it is necessary to start discharging, the third switch 25 is first controlled to close. Since a second diode 22 is also provided on the first discharge branch (its positive pole is connected to the energy storage unit, and its negative pole should be correctly connected to the discharge unit 18 or the pre-circuit of the discharge unit 18), when the third switch 25 is closed and the voltage of the energy storage unit is high enough, the second diode 22 will be forward-conducted, allowing current to flow to the discharge unit 18 through the first discharge branch. At this stage, since only the first discharge branch is turned on and is limited by the second diode 22 and controlled by the third switch 25, the initial discharge process can be controlled more accurately, reducing potential problems caused by sudden changes in current.
[0048] In some embodiments of this application, please refer to Figure 2 , Figure 2 Schematic diagram of the circuit structure of the charging and discharging circuit provided in this embodiment; the number of energy storage units in this embodiment is multiple, and the multiple energy storage units are connected to the charging unit 19 and the discharging unit 18, and a first charging branch and a second charging branch are provided between each energy storage unit and the charging unit 19, and a first discharging branch and a second discharging branch are provided between each energy storage unit and the discharging unit 18.
[0049] In some embodiments of this application, please continue to refer to Figure 2 , Figure 2 1# is the first energy storage unit, and 2# is the second energy storage unit. The energy storage units of this embodiment include the first energy storage unit and the second energy storage unit, and the charge-discharge circuit also includes a main control unit. The main control unit is used to detect the first voltage of the first energy storage unit and the second voltage of the second energy storage unit. When the first voltage is lower than the second voltage, the main control unit controls the first energy storage unit to be connected to the charging unit 19 before the second energy storage unit until the first voltage increases to the second voltage; or the main control unit controls the second energy storage unit to be connected to the discharging unit 18 until the second voltage decreases to the first voltage.
[0050] It should be noted that because battery packs are not completely consistent in their initial states, parameters such as total battery pack voltage and SOC are inconsistent. In particular, battery packs with inconsistent voltages cannot be operated in parallel to prevent circulating currents between them, which can cause unnecessary battery damage and energy loss. This embodiment charges the energy storage unit with the lower voltage first, and then continues charging until the voltages of the two energy storage units are consistent, thereby reducing circulating currents, battery damage, and energy loss.
[0051] It is understandable that in this embodiment, when the main control unit detects that the first voltage is lower than the second voltage, it means that the power of the first energy storage unit is relatively low and needs to be charged first. Therefore, the main control unit will control the first energy storage unit to be connected to the charging unit 19 before the second energy storage unit. This usually means that the switch element (such as the first switch element 23) on the charging branch associated with the first energy storage unit will be closed, so that the charging current can flow into the first energy storage unit. The charging process will continue until the first voltage is increased to be equal to the second voltage or the preset charging target is reached. At this time, the main control unit may adjust the charging strategy, such as switching to charging the second energy storage unit, or charging both energy storage units at the same time (if supported by the system).
[0052] If the system needs to discharge, and the main control unit detects that the first voltage is high enough (or meets other discharge conditions), and the second voltage is still high but needs to be lowered for some reason (such as load balancing, energy recovery, etc.), the main control unit can control the second energy storage unit to be connected to the discharge unit 18. The discharge process will continue until the second voltage drops to the same level as the first voltage or reaches the preset discharge target.
[0053] Example 1: Please continue to see Figure 2 In this embodiment, three energy storage units are provided, namely 1#, 2#, and 3#. The voltages of the 1#, 2#, and 3# battery groups are U1, U2, and U3 respectively.
[0054] When U1=U2=U3: Charging control: When the voltage difference of the three battery strings is less than 5V, it can be considered that they can work in parallel. The BMS master control will sequentially energize the pre-charging relays 23 of battery packs 1#, 2#, and 3#; when it detects that the respective loop currents are greater than 5A, the charging relays 24 of battery packs 1#, 2#, and 3# will be energized in turn. At this time, the voltage between the contacts of relay 24 is the voltage drop of the pre-charging diode 21 and is less than 1V, avoiding contact arcing. Then the pre-charging relay 23 is released, and high-current charging is carried out.
[0055] Discharge control: When the voltage difference between the three battery strings is less than 5V, it can be considered that they can work in parallel. The BMS master control will sequentially energize the pre-discharge relays 25 of battery packs 1#, 2#, and 3#. When it detects that the current in each loop is greater than 5A, the discharge relays 26 of battery packs 1#, 2#, and 3# will be energized in turn. At this time, the voltage between the contacts of relay 26 is the voltage drop of the pre-discharge diode 22 and is less than 1V, avoiding contact arcing. Then the pre-discharge relay 25 is released, and high-current discharge is carried out.
[0056] When U1>U2>U3: Charging control: When the voltage difference of the three battery strings is greater than 5V, they need to be put into operation in sequence. The BMS master control will attract the pre-charging relay 23 of battery pack 3#; when it detects that its loop current is greater than 5A, it will attract the charging relay 24 of battery pack 3#. At this time, the voltage between the contacts of relay 24 is the voltage drop of the pre-charging diode 21 and is less than 1V, avoiding contact arcing. Then the pre-charging relay 23 is released and high-current charging is carried out. When the voltage of battery pack 3# rises to a level close to that of battery pack 2# (the difference is less than 5V), the BMS master control closes the pre-charge relay 23 of battery pack 2#; when it detects that its loop current is greater than 5A, it closes the charging relay 24 of battery pack 2#. At this time, the voltage between the contacts of relay 24 is the voltage drop of the pre-charge diode 21 and is less than 1V, avoiding contact arcing. Then, the pre-charge relay 23 of 2# is released, and high-current charging is continued. As the voltage of battery packs 2# and 3# rises to a level close to U1, that is, when U1-(U2=U3)<5V, the BMS master control closes the pre-charge relay 23 of battery pack 1#; when it detects that its loop current is greater than 5A, it closes the charging relay 24 of battery pack 1#. At this time, the voltage between the contacts of relay 24 of 1# is the voltage drop of the pre-charge diode 21 and is less than 1V, avoiding contact arcing. Then, the pre-charge relay 23 of 1# is released, and high-current charging is continued until the SOC reaches 100% and charging is stopped.
[0057] Discharge control: When the voltage difference between the three battery strings is greater than 5V, they need to be put into operation in sequence. The BMS master control will energize the pre-discharge relay 25 of battery pack 1#; when it detects that its loop current is greater than 5A, it will energize the discharge relay 26 of battery pack 1#. At this time, the voltage between the contacts of relay 26 is the voltage drop of the pre-charge diode 22 and is less than 1V, avoiding contact arcing. Then the pre-discharge relay 24 is released, and high-current discharge is carried out. When the voltage of battery pack 1# drops to a level close to that of battery pack 2# (the difference is less than 5V), the BMS master control closes the pre-discharge relay 25 of battery pack 2#; when it detects that its loop current is greater than 5A, it closes the discharge relay 26 of battery pack 2#. At this time, the voltage between the contacts of relay 26 is the voltage drop of the pre-discharge diode 22 and is less than 1V, avoiding contact arcing. Then, the pre-discharge relay 25 is released, and high-current discharge is carried out again. As the voltage of battery packs 1# and 2# drops to a level close to U3, that is, when U3-(U2=U1)<5V, the BMS master control closes the pre-discharge relay 25 of battery pack 3#; when it detects that its loop current is greater than 5A, it closes the discharge relay 26 of battery pack 3#. At this time, the voltage between the contacts of relay 26 is the voltage drop of the pre-discharge diode 22 and is less than 1V, avoiding contact arcing. Then, the pre-discharge relay 25 is released, and high-current charging is carried out again until the discharge stop condition is met.
[0058] In some embodiments of this application, please refer to Figure 3, Figure 3 A schematic diagram of the circuit structure of the charge and discharge circuit provided in this embodiment is shown; the charge and discharge circuit of this embodiment also includes a first access port 8, a second access port 16 and a main control unit; the first access port 8 is used to connect to a DC power supply; the second access port 16 is used to connect to an AC power supply, and the first access port 8 and the second access port 16 are both connected to an energy storage unit; the main control unit is used to connect the energy storage unit to the first access port 8 / the second access port 16.
[0059] It should be noted that the first access port 8 is used to connect to a DC power source. It is typically an interface capable of receiving DC voltage and current, such as a DC socket or connector. The second access port 16 is used to connect to an AC power source. It may be a standard AC power socket capable of receiving AC voltage and current from the power grid.
[0060] It is understandable that the charging and discharging circuit in this embodiment can switch between an AC power supply and a DC power supply to charge the energy storage unit.
[0061] In some embodiments of this application, please continue to refer to Figure 3 In this embodiment, the discharge unit 18 is connected to the second access port 16, and the discharge unit 18 has a discharge port. The discharge port is configured to be connected to the first access port 8 when the AC power supply is connected to the second access port 16, thereby providing AC power to the energy storage unit.
[0062] It is understood that when an AC power source is connected to the second access port 16, the main control unit controls the charging process, converting the AC power into DC power through a rectifier or other device, and then charging the energy storage unit. In some cases, the main control unit controls the discharge unit 18 to enter a special discharge mode. In this case, the AC power enters the discharge port through the second access port 16 and then enters the first access port 8 through the discharge port, thereby achieving AC charging.
[0063] In some embodiments of this application, please continue to refer to Figure 3 In this embodiment, a fifth switch 2 is provided between the discharge unit 18 and the energy storage unit. The fifth switch 2 is used to disconnect before the first access port 8 is connected to a DC power supply or before the second access port 16 is connected to an AC power supply, and to close before the energy storage unit and the discharge unit 18 are connected.
[0064] Example 2: Please continue to see Figure 3In this embodiment, the charging and discharging circuit is applied to the energy storage and charging vehicle. The energy storage and charging vehicle can charge its battery pack through three-phase AC power. The three-phase AC power is connected through the terminal 16 (16'). After the monitoring system 14 (14') receives the AC charging instruction, it disconnects the battery pack isolation contactor 2 (2') and controls the AC isolation contactor 1 (1') to be attracted. The input end of the charging and discharging module 10, 11 (10'11') is energized. At the same time, the DC charging guns 6, 7 (6', 7') need to be inserted into the The battery pack charging sockets 8, 9 (8', 9'), and high-voltage contactors 3, 4, 5 (3', 4', 5') are simultaneously energized to ensure that the two charging modules 10, 11 (10'11') output in parallel; the monitoring system 14 (14') obtains the battery pack charging demand voltage and current by communicating with the BMS 15 (15'), and controls the charging modules 10, 11 (10', 11') to adjust their output voltage and current through the CAN bus until the battery pack SOC reaches 100% and charging stops.
[0065] DC charging means that the energy storage vehicle can be charged using a ground DC fast charging pile. The system adopts a two-group independent battery cluster management mode, and charges the two groups of battery clusters respectively through two high-power DC fast charging piles, which greatly improves the charging speed; the charging gun of the ground DC fast charging pile needs to be inserted into the DC charging sockets 8, 9 (8', 9') of the vehicle. After the monitoring system receives the DC charging instruction, the AC isolation contactor 1 (1') and the DC isolation contactor 2 (2') are disconnected, and the BMS15 (15') directly communicates with the CAN interface of the ground fast charging pile through the charger CAN interface, and sends the charging demand voltage and current of the battery pack to the ground fast charging pile through the CAN bus, and adjusts the output voltage and current of the charger according to the demand until the Soc reaches 100% and stops charging.
[0066] In some embodiments, the energy storage unit may be a single battery, a battery pack, a battery package, a battery box, a battery cluster, etc.
[0067] Furthermore, in order to better implement the charging and discharging circuit in any of the above embodiments, based on the above charging and discharging circuit, the present application also provides a mobile emergency energy storage system, including the above charging and discharging circuit.
[0068] In some embodiments, the mobile emergency energy storage system is applied to a charging vehicle.
[0069] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.
[0070] The basic concepts have been described above. It will be apparent to those skilled in the art that the detailed disclosure above is merely illustrative and does not limit the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and amendments to the present application. Such modifications, improvements, and amendments are suggested in the present application and remain within the spirit and scope of the exemplary embodiments of the present application.
[0071] At the same time, this application uses specific terms to describe the embodiments of this application. For example, "one embodiment," "an embodiment," and / or "some embodiments" refer to a certain feature, structure, or characteristic related to at least one embodiment of this application. Therefore, it should be emphasized and noted that "one embodiment," "an embodiment," or "an alternative embodiment" mentioned twice or multiple times in different locations in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of this application may be appropriately combined.
[0072] Similarly, it should be noted that, in order to simplify the description of the present disclosure and thus facilitate understanding of one or more utility model embodiments, the foregoing description of the present embodiment sometimes combines multiple features into a single embodiment, figure, or description thereof. However, this disclosure method does not mean that the subject matter of the present application requires more features than those recited in the claims. In fact, the features of an embodiment may be fewer than the total features of a single embodiment disclosed above.
[0073] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.
Claims
1. A charge and discharge circuit, characterized in that: include: Energy storage unit, used to store and release electrical energy; a charging unit, connected to the energy storage unit and used to charge the energy storage unit; a first charging branch, one end of the first charging branch being connected to the energy storage unit and the other end being connected to the charging unit; a second charging branch, the second charging branch and the first charging branch being connected in parallel between the energy storage unit and the charging unit; In which, a first diode is provided on the first charging branch, the positive electrode of the first diode is connected to the charging unit, and the negative electrode of the first diode is connected to the energy storage unit; during the conduction process between the energy storage unit and the charging unit, the first charging branch is conducted before the second charging branch.
2. The charge and discharge circuit according to claim 1, wherein: The first charging branch is provided with a first switch element, and the second charging branch is provided with a second switch element. During the conduction process between the energy storage unit and the charging unit, the first switch element is closed before the second switch element.
3. The charge and discharge circuit according to claim 1, wherein: The charge and discharge circuit further includes: a discharge unit, connected to the energy storage unit and used to release the electrical energy of the energy storage unit; a first discharging branch, one end of the first discharging branch being connected to the energy storage unit and the other end being connected to the discharging unit; a second discharge branch, the second discharge branch and the first discharge branch being connected in parallel between the energy storage unit and the discharge unit; In which, a second diode is provided on the first discharge branch, the positive electrode of the second diode is connected to the energy storage unit, and the negative electrode of the second diode is connected to the discharge unit; during the conduction process of the energy storage unit and the discharge unit, the first discharge branch is conducted before the second discharge branch.
4. The charge and discharge circuit according to claim 3, wherein: The first discharge branch is further provided with a third switch component, and the second discharge branch is provided with a fourth switch component. During the conduction process between the energy storage unit and the discharge unit, the third switch component is closed before the fourth switch component.
5. The charge and discharge circuit according to claim 3, characterized in that: There are multiple energy storage units, and multiple energy storage units are connected to the charging unit and the discharging unit. The first charging branch and the second charging branch are provided between each energy storage unit and the charging unit, and the first discharging branch and the second discharging branch are provided between each energy storage unit and the discharging unit.
6. The charge and discharge circuit according to claim 5, characterized in that: The energy storage unit includes a first energy storage unit and a second energy storage unit, and the charge and discharge circuit further includes a main control unit, and the main control unit is used to detect a first voltage of the first energy storage unit and a second voltage of the second energy storage unit; When the first voltage is lower than the second voltage, the main control unit controls the first energy storage unit to be connected to the charging unit before the second energy storage unit until the first voltage is increased to the second voltage; or, the main control unit controls the second energy storage unit to be connected to the discharging unit until the second voltage is reduced to the first voltage.
7. The charge and discharge circuit according to claim 6, characterized in that: The charging and discharging circuit further includes A first access port, the first access port is used to access a DC power supply; a second access port, the second access port being used to access an AC power source, the first access port and the second access port both being connected to the energy storage unit; A main control unit is used to connect the energy storage unit with the first access port / the second access port.
8. The charge and discharge circuit according to claim 7, characterized in that: The discharge unit is connected to the second access port, and the discharge unit has a discharge port. The discharge port is configured to be connected to the first access port when the AC power supply is connected to the second access port to provide AC power to the energy storage unit.
9. The charge and discharge circuit according to claim 7 or 8, characterized in that: A fifth switch is provided between the discharge unit and the energy storage unit. The fifth switch is used to disconnect before the first access port is connected to the DC power supply or before the second access port is connected to the AC power supply, and to close before the energy storage unit and the discharge unit are connected.
10. A mobile emergency energy storage system, characterized in that: A charging and discharging circuit comprising the charging and discharging circuit according to any one of claims 1 to 9.