Battery box containing high-voltage DCDC module and energy storage battery system

Abstract

The utility model provides a battery box internally provided with a high-voltage DCDC module, the battery box comprises a box body, a battery cell module and a BMS board, the battery cell module is connected with the BMS board, and the battery cell module and the BMS board are both arranged in the box body; the BMS board comprises a high-voltage DCDC module, an MCU module and a DSP module, the high-voltage DCDC module is connected with the DSP module, and the DSP module is connected with the MCU module; the MCU module is connected with the battery cell module; and the high-voltage DCDC module is respectively connected with the output bus and the battery cell module. The utility model further provides an energy storage battery system. The high-voltage DCDC module provided by the utility model has a bidirectional DCDC function, and the voltage of 36-72V can be boosted to 400V to be output. According to the invention, the problems that the existing energy storage battery box adopts series connection to realize high voltage, the requirement on battery consistency is high, the cost is high, and the whole battery pack fails due to disconnection of a loop by a single battery are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery box containing a high-voltage DCDC module and an energy storage battery system. Background Art

[0002] With the in-depth development of new energy industries such as energy storage, photovoltaics and wind energy, various new energy sources are integrated to form complementary energy stations. Complementary energy stations include wind power energy storage power stations, photovoltaic energy storage power stations, and wind and solar energy storage power stations.

[0003] Energy storage systems are usually used in different scenarios (power generation side, transmission side, user side) through energy storage battery boxes. Existing energy storage battery boxes generally meet the use requirements of high-voltage batteries by connecting multiple batteries in series. However, high-voltage batteries have high requirements for battery consistency, which makes the battery use cost high. Moreover, if the high voltage requirement is achieved by series connection, once one of the batteries in the series battery pack is disconnected, the entire battery pack will fail, greatly reducing the stability of the energy storage battery pack. Utility Model Content

[0004] Based on this, the embodiments of the utility model provide a battery box and an energy storage battery system containing a high-voltage DCDC module, aiming to solve the problems that the existing energy storage battery box uses a series connection method to achieve high voltage, has high requirements for battery consistency, has high use costs, and a single battery disconnects the circuit causing the entire battery pack to fail.

[0005] To achieve the above-mentioned purpose, on the one hand, an embodiment of the utility model provides a battery box containing a high-voltage DCDC module, comprising a box body, a battery cell module and a BMS board, wherein the battery cell module is connected to the BMS board, and the battery cell module and the BMS board are both arranged in the box body;

[0006] The BMS board includes a high-voltage DCDC module, an MCU module and a DSP module. The high-voltage DCDC module is connected to the DSP module, and the DSP module is connected to the MCU module; the MCU module is connected to the battery cell module; the high-voltage DCDC module is respectively connected to the output bus and the battery cell module.

[0007] As a preferred embodiment, the high-voltage DCDC module is provided with a bidirectional buck-boost unit, which is connected to the battery module and the DSP module respectively. Through the bidirectional buck-boost unit, the high-voltage DCDC module can boost the voltage of the battery module from 36V to 72V to 400V for output; it can also buck the voltage of 400V to 36V to 72V to charge the battery module.

[0008] As a preferred implementation, the BMS board is provided with a LED indicator light module and a buzzer module which are independent of each other, and the LED indicator light module is arranged adjacent to the buzzer module.

[0009] As a preferred implementation, a manual button module and a CAN module are provided on the BMS board, and the manual button module is arranged adjacent to the CAN module.

[0010] As a preferred implementation, the BMS board is provided with an RS485 module and a DI / DO module, and the RS485 module is arranged adjacent to the DI / DO module.

[0011] As a preferred embodiment, the battery cell module is a module containing 15 strings of single batteries or 16 strings of single batteries.

[0012] As a preferred embodiment, a heat-conducting structure is provided on the box body, which is beneficial to the heat dissipation of the battery box and can meet the normal charging / discharging heat dissipation requirements of the battery box.

[0013] As a preferred implementation, the heat-conducting structure is a heat-dissipating fan or a heat-conducting box.

[0014] As a preferred embodiment, the battery cell module is connected to the BMS board via a temperature sensing line, a signal acquisition line or a battery bus bar.

[0015] On the other hand, an embodiment of the present application further provides an energy storage battery system, which includes a plurality of battery boxes containing high-voltage DCDC modules, and the plurality of battery boxes containing high-voltage DCDC modules are connected in parallel with each other.

[0016] As a preferred embodiment, the battery box containing the high-voltage DCDC module is connected to the external device for communication. In this way, the remote control of the battery energy storage system can be realized to receive boost, buck and other commands and parameter values, and output a stable discharge voltage value; and the output voltage can be adjusted according to actual needs through the boost and buck functions of the high-voltage DCDC module.

[0017] Compared with the prior art, the structure of the present application has the following technical effects: In the embodiment of the present application, by setting a high-voltage DCDC module, the output voltage of the battery can be increased to 400V. In addition, the voltage boost is achieved through the high-voltage DCDC module, which significantly reduces the requirements for battery consistency, thereby reducing costs. The start and stop charging and discharging can be controlled by the bidirectional buck-boost unit, and the BUS output voltage can be converted to change the characteristic that the battery output voltage decreases as the capacity decreases, so that the discharge voltage of the battery is constant. At the same time, the characteristic of constant discharge voltage is used to control the battery to output different voltages in different application scenarios, which is suitable for a variety of application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0019] Figure 1 This is a schematic structural block diagram of a battery box containing a high-voltage DCDC module according to an embodiment of the utility model;

[0020] Figure 2 for Figure 1 Schematic diagram of the internal structure of the BMS board;

[0021] Figure 3 This is a schematic structural diagram of an energy storage battery system according to another embodiment of the present application.

[0022] Figure 4 It is a structural diagram of an existing energy storage system.

[0023] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom...), the directional indications 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.

[0026] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0028] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0029] Specifically, on the one hand, Figure 1 to Figure 2 As shown, the embodiment of the utility model provides a battery box containing a high-voltage DCDC module, including a box body 10, a battery cell module 20 and a BMS board 30, wherein the battery cell module 20 is connected to the BMS board 30, and the battery cell module 20 and the BMS board 30 are both arranged in the box body 10;

[0030] The BMS board 30 includes a high-voltage DCDC module 31, an MCU module 32 and a DSP module 33. The high-voltage DCDC module 31 is connected to the DSP module 33, and the DSP module 33 is connected to the MCU module 32; the MCU module 32 is connected to the battery cell module 20; and the high-voltage DCDC module 31 is respectively connected to the output bus 40 and the battery cell module 20.

[0031] In the embodiment of the present application, by setting a high-voltage DCDC module, the output voltage of the battery can be increased to 400V, and the general output voltage is adjustable in the range of 150V to 465V; different from the ordinary DCDC module, the output voltage of the ordinary DCDC module is generally 36V to 72V; at the same time, through the high-voltage DCDC module, charging can be achieved by reducing the voltage and increasing the current inside the battery. In addition, the voltage boost achieved by the high-voltage DCDC module significantly reduces the requirements for battery consistency, thereby reducing costs.

[0032] As a preferred embodiment, a bidirectional buck-boost unit (not marked in the figure) is provided on the high-voltage DCDC module 31 , and the bidirectional buck-boost unit is connected to the battery module 20 and the DSP module 33 respectively.

[0033] By setting up a bidirectional buck-boost unit, the start and stop of charging and discharging can be controlled, the voltage can be boosted to 400V, and the BUS output voltage can be converted, changing the characteristic that the battery output voltage decreases as the capacity decreases, so that the discharge voltage of the battery is constant; at the same time, the high-voltage DCDC module can boost the voltage of the battery cell module from 36V to 72V to 400V output; it can also step down the voltage of 400V to 36V to 72V to charge the battery cell module.

[0034] As a preferred embodiment, the BMS board 30 is provided with an LED indicator light module 34 and a buzzer module 35 which are independent of each other, and the LED indicator light module 34 and the buzzer module 35 are arranged adjacent to each other.

[0035] As a preferred embodiment, a manual button module 36 and a CAN module 37 are provided on the BMS board 30 , and the manual button module 36 is disposed adjacent to the CAN module 37 .

[0036] As a preferred embodiment, the BMS board 30 is provided with an RS485 module 38 and a DI / DO module 39 , and the RS485 module 38 is arranged adjacent to the DI / DO module 39 .

[0037] In the embodiment of the present application, the MCU module and the DSP module enable the BMS board to measure parameters such as temperature, voltage, and current, and have alarm and protection functions such as over-temperature, under-voltage, over-voltage, over-current, short circuit, and reverse connection, so that users can understand the battery status and protect the battery. The indicator light can indicate the battery module SOC, charge and discharge status, and alarm status. The buzzer sounds during the power on / off and alarm status to remind the battery module status. The manual button module controls the module power on / off and restores initialization.

[0038] As a preferred embodiment, the battery cell module 20 is a module containing 15 strings of single batteries or 16 strings of single batteries.

[0039] As a preferred embodiment, a heat-conducting structure (not marked in the figure) is provided on the box body 10. The heat-conducting structure is provided to facilitate heat dissipation of the battery box and can meet the normal charging / discharging heat dissipation requirements of the battery box.

[0040] As a preferred implementation, the heat-conducting structure is a heat-dissipating fan or a heat-conducting box.

[0041] In an embodiment of the present application, a method for controlling the charge and discharge of a battery box includes:

[0042] Receive the discharge command and perform discharge control according to the discharge command. This high-voltage DCDC module raises the battery module voltage from 36V to 72V to 400V, and reports the voltage, current, temperature, and power of the battery pack through the communication port. During the discharge of the battery box, when the voltage of the battery pack drops to the preset value, the MOS tube is controlled to shut down, so that the power supply circuit stops working.

[0043] Receive charging instructions, open the charging circuit according to the charging instructions, and charge the battery pack. The high-voltage DCDC module reduces the charging voltage of 400V to 36V~72V to charge the battery module, and at the same time reports the voltage, current, temperature, power and other information of the battery pack through the communication port.

[0044] As a preferred embodiment, the battery cell module 20 is connected to the BMS board 30 via a temperature sensing line, a signal acquisition line or a battery busbar. Specifically, in this embodiment, the battery cell module 20 is connected to the BMS board 30 via a battery busbar. It is understandable that in other embodiments, the battery cell module 20 can also be connected to the BMS board via a temperature sensing line or a signal acquisition line.

[0045] The application scenarios of the battery box containing a high-voltage DCDC module in the present application can be a high-voltage energy storage system, a data center UPS, etc.

[0046] On the other hand, Figure 3 As shown, the embodiment of the present application also provides an energy storage battery system, the energy storage battery system includes a plurality of battery boxes 100 containing high-voltage DCDC modules, and the plurality of battery boxes 100 containing high-voltage DCDC modules are connected in parallel with each other. The battery boxes 100 containing high-voltage DCDC modules are connected in parallel with each other and then connected to the load 200.

[0047] By connecting the battery boxes containing the high-voltage DCDC modules in parallel, the capacity can be increased to form a battery pack and enhance the stability of the system. Figure 4As shown), the energy storage battery system of the present application greatly reduces its requirements for battery consistency. At the same time, when one battery fails, the remaining batteries can continue to work, which also significantly increases the stability of the system.

[0048] The main function of the high-voltage DCDC module in the energy storage system is to serve as a bridge between the high-voltage battery interface and the low-voltage battery. It has the function of charging and discharging the low-voltage battery, and can independently determine the charging and discharging conditions, showing the characteristics of the high-voltage battery from the outside. It integrates BMS, intelligent sleep, battery heating, communication, remote tripping and other functions, and is compatible with 15-string and 16-string battery applications. Different battery clusters also support parallel expansion.

[0049] When the BMS board receives a discharge command through the communication port, it will turn on the discharge MOSFET to start the power supply circuit; when it receives a charge command, it will turn on the charge MOSFET to start the charge circuit to charge the battery. When it receives a stop charge and discharge command, the MOSFET turns off the circuit and stops working.

[0050] As a preferred embodiment, the battery box 100 containing the high-voltage DCDC module is connected to an external device (not marked in the figure) for communication. In this way, the remote control of the battery energy storage system can be realized to receive boost, buck and other commands and parameter values, and output a stable discharge voltage value; and the output voltage can be adjusted according to actual needs through the boost and buck functions of the high-voltage DCDC module.

[0051] This application solves the problems of existing energy storage battery boxes using series connection to achieve high voltage, high requirements for battery consistency, high cost of use, and failure of the entire battery pack due to disconnection of a single battery circuit. This application can collect operating data in real time and adaptively adjust the operating mode according to the operating status without manual intervention, thus reducing operation and maintenance costs; by adopting an integrated design, the energy consumption cost of the product is reduced, and the economic benefits are obvious; each electrical component and system has multiple protections, and can process and analyze operating data in real time through the information technology and network technology of the big data cloud platform, providing safe, clean, reliable and cheap electricity for the stable operation of the system. This application has high intelligence, integration and security, and can integrate photovoltaic and wind energy into one energy storage system.

[0052] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A battery box containing a high voltage DCDC module, characterized in that: It includes a box, a battery module and a BMS board, wherein the battery module is connected to the BMS board, and the battery module and the BMS board are both arranged in the box; The BMS board includes a high-voltage DCDC module, an MCU module and a DSP module. The high-voltage DCDC module is connected to the DSP module, and the DSP module is connected to the MCU module; the MCU module is connected to the battery cell module; the high-voltage DCDC module is respectively connected to the output bus and the battery cell module.

2. The battery box containing a high-voltage DCDC module according to claim 1, characterized in that: The high-voltage DCDC module is provided with a bidirectional buck-boost unit, and the bidirectional buck-boost unit is connected to the battery cell module and the DSP module respectively.

3. The battery box containing a high-voltage DCDC module according to claim 1, characterized in that: The BMS board is provided with a LED indicator light module and a buzzer module which are independent of each other, and the LED indicator light module is arranged adjacent to the buzzer module.

4. The battery box containing a high-voltage DCDC module according to claim 1, characterized in that: The BMS board is provided with a manual button module and a CAN module, and the manual button module is arranged adjacent to the CAN module; The BMS board is provided with an RS485 module and a DI / DO module, and the RS485 module is arranged adjacent to the DI / DO module.

5. The battery box containing a high-voltage DCDC module according to claim 1, characterized in that: The battery cell module is a module containing 15 strings of single batteries or 16 strings of single batteries.

6. The battery box containing a high-voltage DCDC module according to claim 1, characterized in that: The box body is provided with a heat conducting structure.

7. The battery box containing a high-voltage DCDC module according to claim 6, characterized in that: The heat-conducting structure is a heat-dissipating fan or a heat-conducting box.

8. The battery box containing a high-voltage DCDC module according to claim 1, characterized in that: The battery cell module is connected to the BMS board via a temperature sensing line, a signal acquisition line or a battery bus bar.

9. An energy storage battery system, characterized in that: The energy storage battery system comprises a plurality of battery boxes containing high-voltage DCDC modules as described in any one of claims 1 to 8, and the plurality of battery boxes containing high-voltage DCDC modules are connected in parallel with each other.

10. The energy storage battery system according to claim 9, characterized in that: The battery box containing the high-voltage DCDC module is communicatively connected with an external device.

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