BMS safety chain protection device

Abstract

The present invention discloses a BMS safety chain protection device, which is matched with at least one junction cabinet. The BMS safety chain protection device includes a battery system master control unit, which is connected to the upper-level EMS, and the battery system master control unit includes an output relay K0. Each junction cabinet includes a DC control unit and at least one battery measurement unit. The input end of each battery measurement unit is electrically connected to the output relay K0 of the battery system master control unit at the same time, and the output end of each battery measurement unit is respectively provided with an output relay. The BMS safety chain protection device disclosed by the present invention improves the response speed and reliability of BMS to battery protection.

Description

Technical Field

[0001] The present invention belongs to the technical field of power management systems, and in particular relates to a BMS safety chain protection device. Background Art

[0002] The utility model patent with the publication number CN204547817U and the subject name is a new BMS battery management system. Its technical solution discloses "including a display module (1), a central processing module (2), and a terminal module (3); data between the display module (1) and the central processing module (2) are bidirectionally communicated, and data between the central processing module (2) and the terminal module (3) are bidirectionally communicated; the display module (1) includes a display unit, a voice alarm unit, a data storage unit, and a remote communication unit A; the central processing module (2) includes a total voltage measurement unit, a total current measurement unit, an insulation resistance measurement unit, a residual energy calculation unit, a data analysis unit, a hierarchical alarm unit, and an input and output control unit; the terminal module (3) includes a single cell voltage measurement unit, a single cell temperature measurement unit, an energy balancing unit, a heat management unit, a data integration unit, and a remote communication unit".

[0003] Taking the above utility model patent as an example, in the past, the protection of battery packs mainly relied on BMS to collect data such as battery voltage, temperature, SOC, etc. to determine whether the battery is normal. If it is not normal, a cut-off signal is sent to the battery string. However, the above technical solution has shortcomings, mainly:

[0004] 1) Slow response: The amount of battery data that BMS needs to collect is huge, and it takes one to three seconds to refresh it.

[0005] 2) Poor reliability: The collection of these data relies on serial communication. In the harsh electromagnetic environment on site, the communication is likely to be interfered with, and the battery data cannot be transmitted back in time or not at all. When the battery is abnormal, the BMS cannot isolate and protect the battery in time. Summary of the invention

[0006] In view of the prior art, the present invention overcomes the above defects and provides a BMS safety chain protection device.

[0007] The main purpose of the present invention is to improve the response speed and reliability of BMS to battery protection.

[0008] The present invention adopts the following technical solution: the BMS safety chain protection device is matched with at least one combiner cabinet respectively, the BMS safety chain protection device includes a battery system master control unit, the battery system master control unit is connected to the upper-level EMS, and the battery system master control unit includes an output relay K0;

[0009] Each combiner cabinet comprises a DC control unit and at least one battery measurement unit, wherein:

[0010] The input end of each battery measurement unit is electrically connected to the output relay K0 of the battery system main control unit at the same time, and the output end of each battery measurement unit is respectively provided with an output relay;

[0011] The DC control unit includes a main contactor KM, the output relays of the output ends of the battery measurement units are connected in series and electrically connected to the input interface of the DC control unit of the combiner cabinet at the same time, and the output interface of the DC control unit is connected to the battery pack of the combiner cabinet.

[0012] According to the above technical solution, as a further preferred technical solution of the above technical solution, the number of battery measurement units in each combiner cabinet is 13.

[0013] According to the above technical solution, as a further preferred technical solution of the above technical solution, the number of the combiner cabinets is 3.

[0014] The patent application of the present invention also discloses a BMS safety chain protection device, which is matched with at least one combiner cabinet respectively. The BMS safety chain protection device includes a battery system master control unit, which is connected to the upper-level EMS. The battery system master control unit includes an output relay K0;

[0015] Each combiner cabinet comprises a DC control unit and at least one battery measurement unit, wherein:

[0016] The input end of each battery measurement unit is electrically connected to the output relay K0 of the battery system main control unit at the same time, and the output end of each battery measurement unit is respectively provided with an output relay;

[0017] The DC control unit includes a photoelectric isolator and a main contactor KM. The output relays of the output ends of the battery measuring units are connected in series with each other and are electrically connected to the input interface of the DC control unit of the combiner cabinet at the same time. The output interface of the DC control unit is connected to the battery pack of the combiner cabinet.

[0018] According to the above technical solution, as a further preferred technical solution of the above technical solution, the number of battery measurement units in each combiner cabinet is 13.

[0019] According to the above technical solution, as a further preferred technical solution of the above technical solution, the number of the combiner cabinets is 3.

[0020] The BMS safety chain protection device disclosed in the present invention has the beneficial effect of improving the response speed and reliability of the BMS to battery protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a system block diagram of the present invention. DETAILED DESCRIPTION

[0022] The present invention discloses a BMS safety chain protection device. The specific implementation of the present invention is further described below in conjunction with a preferred embodiment.

[0023] See attached figure Figure 1 , Figure 1 The system structure of the BMS safety chain protection device is shown.

[0024] Preferred embodiments.

[0025] Preferably, the BMS safety chain protection device can be matched with at least one combiner cabinet respectively, and the BMS safety chain protection device includes (one) battery system master control unit, the battery system master control unit is connected to the upper-level EMS, and the battery system master control unit includes (one) output relay K0;

[0026] Each combiner cabinet comprises (one) DC control unit and at least one battery measurement unit, wherein:

[0027] The input end of each battery measurement unit is electrically connected to the output relay K0 of the battery system main control unit at the same time, and the output end of each battery measurement unit is respectively provided with an output relay (K1, K2...K13...);

[0028] The DC control unit includes (one) main contactor KM, the output relays of the output ends of the battery measuring units are connected in series with each other and are electrically connected (and powered) to the input interface of the DC control unit of the junction box at the same time, and the output interface of the DC control unit is connected to the battery pack of the junction box.

[0029] The number of battery measurement units in each combiner cabinet is preferably 13.

[0030] It is worth mentioning that the number of battery measurement units in each combiner cabinet should not be understood as only 13, and can be reasonably configured and adjusted according to actual needs.

[0031] The number of the combiner cabinets is preferably 3.

[0032] It is worth mentioning that the number of the combiner cabinets should not be understood as only three, and can be reasonably configured and adjusted according to actual needs.

[0033] First embodiment.

[0034] Preferably, the BMS safety chain protection device can be matched with at least one combiner cabinet respectively, and the BMS safety chain protection device includes (one) battery system master control unit, the battery system master control unit is connected to the upper-level EMS, and the battery system master control unit includes (one) output relay K0;

[0035] Each combiner cabinet comprises (one) DC control unit and at least one battery measurement unit, wherein:

[0036] The input end of each battery measurement unit is electrically connected to the output relay K0 of the battery system main control unit at the same time, and the output end of each battery measurement unit is respectively provided with an output relay (K1, K2...K13...);

[0037] The DC control unit includes (one) photoelectric isolator and (one) main contactor KM. The output relays of the output ends of the battery measuring units are connected in series with each other and are electrically connected (and powered) to the input interface of the DC control unit of the combiner cabinet at the same time. The output interface of the DC control unit is connected to the battery pack of the combiner cabinet.

[0038] The number of battery measurement units in each combiner cabinet is preferably 13.

[0039] It is worth mentioning that the number of battery measurement units in each combiner cabinet should not be understood as only 13, and can be reasonably configured and adjusted according to actual needs.

[0040] The number of the combiner cabinets is preferably 3.

[0041] It is worth mentioning that the number of the combiner cabinets should not be understood as only three, and can be reasonably configured and adjusted according to actual needs.

[0042] According to the above embodiments, the BMS safety chain protection device disclosed in the patent application of the present invention is specifically described as follows.

[0043] Specifically, the BMS safety chain protection device includes three levels:

[0044] Bottom layer: Battery Measurement Unit (BTU);

[0045] Middle level: DC control unit (DCU);

[0046] Upper layer: Battery system control unit (BSU).

[0047] Among them, BSU is allowed to work after receiving instructions from the upper EMS (Energy Management System). BSU does not detect faults, its output relay K0 contact is closed, and 24V control power is output. Through each BTU (when the voltage and temperature of each battery cell are normal, its output relay contact is closed), the output relay contacts are connected in series (K13, K12..., K1), and the input interface of DCU is powered. After optical coupling isolation, DCU receives a signal that the string is normal. At this time, if the BSU closes the command, the main contactor KM closes, and the battery pack is connected to the PCS (Power Convert System).

[0048] On the contrary, if a BTU fails and any one of K1 to K13 is disconnected, the DCU will receive a signal that the string is abnormal and quickly disconnect KM (without going through the communication network), cutting off the connection between the battery pack and the PCS to ensure the safety of the battery pack.

[0049] It is worth mentioning that, according to the above embodiments, the BMS safety chain protection device disclosed in the patent application of the present invention forms a safety chain through relay contacts and hardware circuits:

[0050] 1) Fast response: no communication delay, more timely protection of the battery pack.

[0051] 2) High reliability: The hardware circuit constitutes a safety link and will not be interfered by the harsh electromagnetic environment on site, making the battery pack protection action more reliable.

[0052] It is worth mentioning that the technical features such as EMS and PCS involved in the patent application of the present invention should be regarded as prior art. The specific structure, working principle and possible control method and spatial layout method of these technical features can be selected according to the conventional selection in the field, and should not be regarded as the inventive point of the patent of the present invention. The patent of the present invention will not be further elaborated.

[0053] For those skilled in the art, it is still possible to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A BMS safety chain protection device, characterized in that: At least one combiner cabinet is matched respectively, the BMS safety chain protection device includes a battery system master control unit, the battery system master control unit is connected to the upper EMS, and the battery system master control unit includes an output relay K0; Each combiner cabinet comprises a DC control unit and at least one battery measurement unit, wherein: The input end of each battery measurement unit is electrically connected to the output relay K0 of the battery system main control unit at the same time, and the output end of each battery measurement unit is respectively provided with an output relay; The DC control unit includes a main contactor KM, and the output relays of the output ends of the battery measurement units are connected in series with each other and are electrically connected to the input interface of the DC control unit of the combiner cabinet at the same time, and the output interface of the DC control unit is connected to the battery pack of the combiner cabinet; The BMS-based safety chain protection device forms a safety chain through relay contacts and hardware circuits.

2. The BMS safety chain protection device according to claim 1 is characterized in that: The number of battery measurement units in each combiner cabinet is 13.

3. The BMS safety chain protection device according to claim 1 is characterized in that: The number of the combiner cabinets is 3.

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