Battery online charging and discharging system

Abstract

The present application discloses an online battery charging and discharging system, wherein the online battery charging and discharging system includes: a DC bus, a DC-DC converter, a battery pack, a controller, a first contactor, a diode, and a DC load; the DC-DC converter is arranged between the DC bus and the battery pack, and is communicatively connected to the controller; the contactor is arranged between the DC-DC converter and the battery pack; the DC load is connected to the DC bus; the diode is arranged between the DC load and the battery pack, and is arranged in parallel with the DC-DC converter. The online battery charging and discharging system based on the technical solution of the present application saves a lot of time and labor costs, greatly improves the efficiency of charging and discharging and nuclear capacity, avoids damage to the battery caused by offline operation, and saves energy to a certain extent, ensuring the reliability of the power system.

Description

Technical Field

[0001] The present application relates to the technical field of battery charging and discharging, and in particular to an online battery charging and discharging system. Background Art

[0002] With the advancement of technology and the development of social informatization, the stability of power systems, the continuity of communication networks, and the uninterrupted operation of important facilities such as data centers are becoming increasingly important. The performance and capacity status of battery packs as backup power sources directly determine the emergency response capabilities and sustained operation capabilities of these systems.

[0003] Traditional battery capacity and health tests are usually conducted through offline charge and discharge tests, which require regular on-site manual testing to assess the battery's health and actual charge capacity. However, this method is time-consuming, inefficient, has a long test cycle, and has certain damage to the battery itself (frequent deep charge and discharge may cause accelerated battery aging), and cannot reflect the actual working status of the battery in real time. In addition, as the number of batteries and battery capacity increase, the cost and difficulty of manual maintenance also increase.

[0004] Traditional DC power supply systems generally adopt an offline capacity verification method, that is, the battery is separated from the system and discharged at a deep or constant current to determine its actual capacity. This capacity verification method requires special equipment (such as a discharge meter), professional technicians, and strict operating procedures. Data recording relies on manual work, which is prone to errors or omissions. It is not only inefficient and complicated to operate, but frequent offline operations may also cause additional mechanical and thermal stress on the battery, accelerate battery aging, or cause potential failures. At the same time, during the offline capacity verification process, the battery group to be tested must be removed from the system, resulting in a reduction in the available capacity of the backup power system, and a greatly increased risk of the system losing backup protection when the main power fails.

[0005] In view of this, a new technical solution is urgently needed to solve the above technical problems. Utility Model Content

[0006] The main purpose of this application is to provide a battery online charging and discharging system, which aims to solve the technical problems of high charging and discharging and capacity verification costs and easy damage of batteries in existing battery offline charging and discharging systems.

[0007] To achieve the above purpose, the battery online charging and discharging system proposed in this application includes:

[0008] DC bus, DC-DC converter, battery pack, controller, first contactor, diode and DC load;

[0009] The DC-DC converter is arranged between the DC bus and the battery pack, and is communicatively connected with the controller;

[0010] The first contactor is disposed between the DC-DC converter and the battery pack;

[0011] The DC load is connected to the DC bus;

[0012] The diode is arranged between the DC load and the battery pack, and is arranged in parallel with the DC-DC converter.

[0013] Optionally, the battery online charging and discharging system further includes: a second contactor; the second contactor is arranged between the diode and the battery pack.

[0014] Optionally, the battery online charging and discharging system further includes:

[0015] Backend terminal;

[0016] The controller is communicatively connected with the background terminal.

[0017] Optionally, the DC load and the DC-DC converter are electrically connected to the DC bus respectively.

[0018] Optionally, the battery pack includes a plurality of single cells connected in series.

[0019] Optionally, the single battery is electrically connected to a battery collection module.

[0020] Optionally, a plurality of the battery collection modules are cascaded to form a battery collection module group.

[0021] Optionally, the battery collection module group is electrically connected to the battery pack management module.

[0022] Optionally, the battery pack management module is communicatively connected to the controller.

[0023] Optionally, the battery online charging and discharging system further includes: a fuse; the fuse is close to the battery pack and electrically connected to the battery pack.

[0024] The beneficial effects of this application are as follows:

[0025] By setting a matching DC-DC converter between the DC bus and the battery pack in the battery online charging and discharging system of the present application, and communicating and connecting the DC-DC converter with the controller, and setting the contactor between the DC-DC converter and the battery pack, the DC load is connected to the DC bus, the diode is set between the DC load and the battery pack, and the structural design is set in parallel with the DC-DC converter, online charging, discharging and capacity verification of the battery pack can be realized, and the operation and maintenance personnel do not need to go to the site for wiring, nor do they need to separate the battery from the system for deep or constant current discharge to determine its actual capacity. They only need to operate the controller and contactor switch, which saves a lot of time and labor costs, greatly improves the efficiency of charging, discharging and capacity verification, and avoids damage to the battery by offline operation; the battery online charging and discharging system of the present application uses an actual load as the capacity discharge load, which saves energy to a certain extent compared with the dummy load used in traditional offline capacity verification; the battery is connected to the system through a diode during normal backup, which can ensure real-time backup of the battery and the reliability of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0027] Figure 1 This is a schematic structural diagram of an online battery charging and discharging system according to an embodiment of the online battery charging and discharging system of the present application;

[0028] Figure 2 A schematic structural diagram of an online battery charging and discharging system according to another embodiment of the online battery charging and discharging system of the present application;

[0029] Figure 3 A schematic diagram of charging a battery pack according to an embodiment of an online battery charging and discharging system of the present application;

[0030] Figure 4 A schematic diagram of the battery pack capacity of an embodiment of the battery online charging and discharging system of the present application;

[0031] Figure 5 A schematic diagram of battery pack discharge according to an embodiment of the battery online charging and discharging system of the present application.

[0032] Description of Figure Numbers:

[0033]

[0034]

[0035] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions 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 are within the scope of protection of this application.

[0037] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0038] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, "and / or" in the full text includes three solutions. Taking A and / or B as an example, it includes technical solution A, technical solution B, and technical solution that satisfies both A and B; in addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0039] Please refer to Figure 1 to Figure 5 .

[0040] As shown in the figure, the battery online charging and discharging system includes:

[0041] DC bus 1, DC-DC converter 2, battery pack 3, controller 8, first contactor 4, diode 5 and DC load 6;

[0042] The DC-DC converter 2 is arranged between the DC bus 1 and the battery pack 3, and is in communication connection with the controller 8;

[0043] The first contactor 4 is arranged between the DC-DC converter 2 and the battery pack 3;

[0044] A DC load 6 is connected to the DC bus 1;

[0045] The diode 5 is arranged between the DC load 6 and the battery pack 3 , and is arranged in parallel with the DC-DC converter 2 .

[0046] In this embodiment, the voltage levels at both ends of the DC-DC converter 2 are consistent, wherein the voltage at one end connected to the DC bus 1 or the DC load 6 can always be consistent with the voltage of the DC bus 1, and the voltage at one end connected to the battery pack 3 can float within the range of the corresponding voltage level. For example, when the battery pack 3 is discharging, the voltage at one end connected to the DC load 6 can be always stable at 56V, and the voltage at one end connected to the battery pack 3 can be slowly reduced from 56V to 46V. During the voltage reduction process, the DC-DC converter 2 is required to increase the real-time voltage at this end to 56V to supply power to the DC load 6. Similarly, in the process of charging the battery pack 3, the DC-DC converter 2 will reduce the bus voltage of 56V to 46V to charge the battery, and as the battery pack 3 is charged more and more, its voltage will gradually rise.

[0047] N DC-DC converters 2 can be set between the DC bus 1 and a battery pack 3, and N DC-DC converters 2 can be connected in parallel to charge the battery pack 3. For example, if the charging power required by the battery pack 3 is 20kw, it can be charged with one 20kw DC-DC converter 2, two 10kw DC-DC converters 2, or four 5kw DC-DC converters 2. The purpose of this is that even if one of the DC-DC converters 2 has a problem, the normal operation of the entire system can be maintained, and the battery pack 3 can continue to charge and discharge. In addition, on the basis of meeting a certain number of DC-DC converters 2 for charging power, one or more spare DC-DC converters 2 can be additionally set, thereby further improving the stability of the operation of the entire system.

[0048] The battery pack 3 includes a plurality of single cells connected in series.

[0049] The DC-DC converter 2 is in communication connection with the controller 8 , and the controller 8 has an electrical signal acquisition module and an electrical signal transmission module, which can detect battery parameters such as current, voltage, internal resistance, capacity and temperature of the battery pack 3 .

[0050] The control principle of the battery online charging and discharging system is as follows:

[0051] When the battery needs to be charged, the first contactor 4 is closed, and the controller 8 can draw power from the DC bus 1 through the DC-DC converter 2 to reduce the voltage to charge the battery pack 3; when the battery pack 3 needs to be increased in capacity, the first contactor 4 is closed, and the controller 8 can draw power from the battery pack 3 through the DC-DC converter 2, and the voltage is increased, and the battery pack 3 outputs electrical energy to power the DC load 6 on the DC bus 1. When charging or increasing capacity is not required, the first contactor 4 is opened, and the battery pack 3 is connected to the DC bus 1 through the diode 5 and used as a backup power supply for the system. Among them, the DC-DC converter 2 and the controller 8 can be connected via RS485 communication. Specifically, it can be connected to the RS485-1 interface of the controller 8.

[0052] By setting a matching DC-DC converter 2 between the DC bus 1 and the battery pack 3 in the battery online charging and discharging system of the present application, and communicating the DC-DC converter 2 with the controller 8, and the first contactor 4 is set between the DC-DC converter 2 and the battery pack 3, the DC load 6 is connected to the DC bus 1, and the diode 5 is set between the DC load 6 and the battery pack 3, and the structural design is set in parallel with the DC-DC converter 2, the online charging, discharging and capacity verification of the battery pack can be realized, and the operation and maintenance personnel do not need to go to the site for wiring, nor do they need to separate the battery from the system for deep or constant current discharge to determine its actual capacity. They only need to operate through the controller 8 or the background terminal 9, which saves a lot of time and labor costs, greatly improves the efficiency of charging, discharging and capacity verification, and avoids damage to the battery by offline operation; the battery online charging and discharging system of the present application uses an actual load as the capacity discharge load, which saves energy to a certain extent compared with the dummy load used in the traditional offline capacity verification; the battery is connected to the system through the diode 5 during normal backup, which can ensure real-time backup of the battery and the reliability of the power system.

[0053] Optionally, in one embodiment, the battery online charging and discharging system further includes: a second contactor, which is arranged between the diode 5 and the battery pack 3 .

[0054] Specific reference Figure 2 In order to better charge the battery pack 3 evenly, the second contactor can be provided, and when the corresponding battery pack 3 is charged, the first contactor 4 is closed and the second contactor is opened.

[0055] Optionally, in one embodiment, the battery online charging and discharging system further includes:

[0056] The backend terminal 9 , the controller 8 is in communication connection with the backend terminal 9 .

[0057] The background terminal 9 can be a data processing terminal such as a server, a computer, or a smart phone. By connecting the controller 8 to the background terminal 9, the various operating parameters of the battery online charging and discharging system can be remotely monitored and controlled in the background. For example, the controller 8 can send the monitored battery parameters such as the current, voltage, internal resistance, capacity, and temperature of the battery pack 3 to the background for remote monitoring. For another example, the entire charging, discharging, and capacity verification process can be performed remotely in the background. For this embodiment, the efficiency of operation and maintenance is greatly improved by remotely verifying the capacity and discharging and charging of the battery pack. The operation and maintenance personnel do not need to go to the site to connect the wires, but only need to operate in the background, which saves a lot of time and cost. Among them, the controller 8 can be connected to the background terminal 9 through the RS485-3 interface.

[0058] Optionally, in one embodiment, the DC load 6 and the DC-DC converter 2 are electrically connected to the DC bus 1 respectively.

[0059] For this embodiment, the remote nuclear capacitor discharge load is an actual load, which saves energy to a certain extent compared with the dummy load used in the traditional offline nuclear capacitor.

[0060] When the battery pack 3 is in a charging state, the DC load 6 is connected in parallel with the battery pack 3 ; when the battery pack 3 is in a capacity or discharge state, the DC load 6 is connected in series with the battery pack 3 .

[0061] Optionally, in one embodiment, the battery pack 3 includes a plurality of single batteries connected in series.

[0062] The single battery is electrically connected to the battery collection module.

[0063] The battery pack 3 can connect multiple single batteries in series as needed.

[0064] The single cell is electrically connected to the battery acquisition module. The purpose of this design is to enable the battery acquisition module to monitor the health status and working condition of each single cell, so as to detect battery abnormalities in time and avoid adverse effects on the battery pack 3 and the entire system.

[0065] Optionally, in one embodiment, a plurality of battery collection modules are cascaded to form a battery collection module group.

[0066] It is also called the hand-in-hand connection of single-cell sampling modules, which can be considered as a serial communication connection method.

[0067] Optionally, in one embodiment, the battery collection module group is electrically connected to the battery group management module 7 .

[0068] The battery pack management module 7 is in communication connection with the controller 8 .

[0069] In this embodiment, the battery pack 3 can be uniformly managed by the corresponding battery pack management module 7, and the battery pack management module 7 can summarize the battery information monitored by the battery acquisition module group and send it to the controller 8. Among them, the battery pack management module 7 and the controller 8 can be connected to each other through the RS485-2 interface.

[0070] Optionally, in one embodiment, the battery online charging and discharging system further includes: a fuse 10 , which is close to the battery pack 3 and electrically connected to the battery pack 3 .

[0071] In order to avoid excessive current when charging or discharging the battery, reduce damage to the system and improve the safety of the system, a fuse 10 can be set at the charging and discharging end of the battery pack 3 to melt and open the circuit in time when the current is too large.

[0072] The above description is only a preferred embodiment of the present application, and does not limit the patent scope of the present application. All equivalent structural changes made by using the contents of the present application specification and drawings under the application concept of the present application, or directly / indirectly used in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A battery online charging and discharging system, characterized in that: The battery online charging and discharging system comprises: DC bus, DC-DC converter, battery pack, controller, first contactor, diode and DC load; The DC-DC converter is arranged between the DC bus and the battery pack, and is communicatively connected with the controller; The first contactor is disposed between the DC-DC converter and the battery pack; The DC load is connected to the DC bus; The diode is arranged between the DC load and the battery pack, and is arranged in parallel with the DC-DC converter.

2. The battery online charging and discharging system according to claim 1, characterized in that: The battery online charging and discharging system further includes: a second contactor; the second contactor is arranged between the diode and the battery pack.

3. The battery online charging and discharging system according to claim 1, characterized in that: The battery online charging and discharging system also includes: Backend terminal; The controller is communicatively connected with the background terminal.

4. The battery online charging and discharging system according to claim 1, characterized in that: The DC load and the DC-DC converter are electrically connected to the DC bus respectively.

5. The battery online charging and discharging system as claimed in claim 1, characterized in that: The battery pack includes a plurality of single batteries connected in series.

6. The battery online charging and discharging system as claimed in claim 5, characterized in that: The single battery is electrically connected to the battery collection module.

7. The battery online charging and discharging system as claimed in claim 6, characterized in that: A plurality of the battery collection modules are cascaded to form a battery collection module group.

8. The battery online charging and discharging system as claimed in claim 7, characterized in that: The battery collection module group is electrically connected to the battery group management module.

9. The battery online charging and discharging system as claimed in claim 8, characterized in that: The battery pack management module is in communication connection with the controller.

10. The battery online charging and discharging system according to claim 1, characterized in that: The battery online charging and discharging system further includes: a fuse; the fuse is close to the battery pack and is electrically connected to the battery pack.

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