High-capacity cluster-level liquid cooling energy storage management system

Abstract

The utility model relates to a large capacity cluster level liquid cooling energy storage management system comprising a plurality of battery clusters and a plurality of PCS modules, each battery cluster respectively corresponds to one PCS module, each battery cluster comprises a plurality of battery packs, and the battery packs in each battery cluster are connected in series; each battery cluster is electrically connected with the input end of the corresponding PCS module, the output end of each PCS module is electrically connected with one end of a circuit breaker, the plurality of battery clusters are divided into at least two groups, and the other ends of the circuit breakers corresponding to each group of battery clusters are connected together; and the EMS management module is respectively in communication connection with each PCS module, and is used for receiving the equipment signals sent by each PCS module and / or issuing control signals to each PCS module. According to the utility model, direct current sides of each cluster can be mutually independent, so that the influence of direct current circulation can be reduced as much as possible.

Description

TECHNICAL FIELD

[0001] The utility model belongs to energy storage management technical field, concretely relates to a kind of large-capacity cluster level liquid cooling energy storage management system. BACKGROUND

[0002] With the continuous growth of energy storage demand, energy storage container as an integrated energy storage solution has been widely used;However, the existing energy storage container still has some deficiencies in battery configuration, system architecture and control mode, etc., Specifically, the following problems mainly exist: (1) the difference of battery causes the direct current side circulation;(2) small fault is easy to cause the whole system to stop;(3) control is not accurate and flexible;Therefore, based on the foregoing deficiencies, how to provide a large-capacity cluster level liquid cooling energy storage management system capable of reducing direct current side circulation, flexible control and high stability has become a problem to be solved. SUMMARY

[0003] The utility model aims at providing a kind of large-capacity cluster level liquid cooling energy storage management system, to solve the problem of the difference of battery existing in prior art will cause direct current side circulation, small fault is easy to cause the whole system to stop and control is not flexible.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] Firstly, a large-capacity cluster level liquid cooling energy storage management system is provided, comprising:

[0006] A plurality of battery clusters and a plurality of PCS modules, wherein each battery cluster corresponds to a PCS module, each battery cluster contains a plurality of battery packs, and each battery pack in each battery cluster is connected in series;

[0007] Each battery cluster is electrically connected to the input end of the corresponding PCS module, and the output end of each PCS module is electrically connected to one end of a circuit breaker, wherein the plurality of battery clusters are divided into at least two groups, and the other end of each circuit breaker corresponding to each group of battery clusters is connected in common, and connected to the power grid, so that each battery cluster belonging to the same group is connected in parallel;

[0008] An EMS management module, wherein the EMS management module is communicatively connected to each PCS module, and is configured to receive device signals sent by each PCS module and / or issue control signals to each PCS module.

[0009] Based on the above disclosure, the utility model discloses a plurality of battery clusters, each battery cluster is divided into at least two groups, wherein each battery cluster contains a plurality of battery packs, and the plurality of battery packs in each battery cluster are connected in series, at the same time, each battery cluster is electrically connected to one end of the circuit breaker through the PCS module, and the other end of each circuit breaker corresponding to each battery cluster is connected in common, and is connected to the power grid, so that each battery cluster belonging to the same group is connected in parallel.

[0010] In one possible design, further comprising: a high-voltage box, wherein each battery cluster corresponds to a high-voltage box, and any battery cluster is electrically connected to the target PCS module through the corresponding high-voltage box, and the target PCS module is the PCS module corresponding to the any battery cluster.

[0011] In one possible design, the high-voltage box includes: a circuit protection unit, a first switch unit, and a second switch unit.

[0012] For any battery cluster, the input end of the circuit protection unit in the corresponding high-voltage box is electrically connected to the any battery cluster, the output end of the circuit protection unit is electrically connected to the input end of the second switch unit through the first switch unit, and the output end of the second switch unit is electrically connected to the PCS module corresponding to the any battery cluster.

[0013] In one possible design, the circuit protection unit includes: a first fuse and a second fuse.

[0014] For any battery cluster, one end of the first fuse in the corresponding high-voltage box is electrically connected to the positive electrode of the any battery cluster, one end of the second fuse in the corresponding high-voltage box is electrically connected to the negative electrode of the any battery cluster, and the other end of the first fuse and the second fuse serves as the output end of the circuit protection unit and is electrically connected to the input end of the second switch unit through the first switch unit.

[0015] In a possible design, the first switch unit includes a QS switch, and the second switch unit includes a first switch and a second switch.

[0016] The other end of the first fuse is electrically connected to a first fixed end of the QS switch, and the other end of the second fuse is electrically connected to a second fixed end of the QS switch, wherein a first movable end of the QS switch is electrically connected to one end of the first switch, a second movable end of the QS switch is electrically connected to one end of the second switch, and the other end of the first switch and the other end of the second switch are electrically connected to input ends of the corresponding PCS module of any battery cluster, respectively.

[0017] In a possible design, the PCS module includes two energy storage converters, wherein the other end of the first switch and the other end of the second switch are electrically connected to input ends of the two energy storage converters, and output ends of the two energy storage converters are electrically connected to one end of the corresponding circuit breaker of any battery cluster.

[0018] In a possible design, the EMS management module includes an EMS management unit, a first Ethernet switch, a second Ethernet switch, and a switch quantity unit.

[0019] The communication interface of each PCS module is communicatively connected to the EMS management unit through the second Ethernet switch, wherein the switch quantity interface of each PCS module is communicatively connected to the switch quantity unit, the switch quantity unit is communicatively connected to the first Ethernet switch, and the first Ethernet switch is communicatively connected to the EMS management unit through the second Ethernet switch.

[0020] In a possible design, the EMS management unit further includes a BMS unit.

[0021] The communication interface of each PCS module is communicatively connected to the communication interface of the BMS unit, the BMS unit is communicatively connected to the first Ethernet switch, wherein the switch quantity interface of the BMS unit is communicatively connected to the switch quantity unit, the switch quantity unit is communicatively connected to the first Ethernet switch, and the first Ethernet switch is communicatively connected to the EMS management unit through the second Ethernet switch.

[0022] In a possible design, each PCS module is communicatively connected to the BMS unit through a CAN bus, and the BMS unit and the first Ethernet switch, the first Ethernet switch and the second Ethernet switch, and the second Ethernet switch and the EMS management unit are all communicatively connected through network cables.

[0023] In one possible design, any battery pack includes a plurality of 1P battery cells, wherein the plurality of 1P battery cells are connected in series to form the any battery pack.

[0024] Advantages:

[0025] (1) The utility model discloses a group string mode, and the connection of battery cluster is carried out, and based on this, the direct current side of each cluster can be independent of each other, thereby the influence of direct current circulation can be reduced as far as possible, further, the alternating current side of each cluster is connected or disconnected through a circuit breaker, thereby the battery energy storage of each cluster is independent of each other, and the battery energy storage of each cluster does not influence each other, and the battery energy storage of each cluster can be charged or discharged independently or synchronously, thereby the problem that the whole system is shut down due to the failure of one cluster is avoided, in addition, each battery cluster is communicated and managed and controlled through an EMS management module, so that in combination with the aforementioned group string mode, the battery system of each cluster can be independently operated, and the operation of all battery clusters can be overall arranged, thereby the flexibility of control is improved, and thus the utility model provides an energy storage scheme with small direct current side circulation influence, stability and reliability and flexible control, thereby being very suitable for large-scale application and popularization.

[0026] (2) The utility model discloses a IP charge-discharge energy storage battery cell (namely 1P high-power battery cell, which is a new type of battery cell technology), which can be applied to peak clipping, frequency modulation and harmonic elimination, anti-flow and other energy storage application scenarios. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 The utility model provides a battery cluster of large capacity cluster level liquid cooling energy storage management system's connection schematic drawing for embodiment of the utility model;

[0028] Figure 2 The utility model provides a battery cluster and EMS management module's connection schematic drawing for embodiment of the utility model. DETAILED DESCRIPTION

[0029] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the utility model will be briefly introduced in combination with the drawings and the description of the embodiments or the prior art, and obviously, the following description of the structure of the drawings is only some embodiments of the utility model, and for ordinary skilled in the art, other drawings can be obtained without creative labor according to these drawings. It needs to be explained that the description of these embodiment modes is used to help understanding the utility model, and does not constitute the limitation to the utility model.

[0030] It should be understood that, although the terms first, second, etc. can be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of example embodiments of the present application.

[0031] It should be understood that, for the term "and / or" which can occur in the present document, it is merely a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, B alone, and A and B together; for the term " / and" which can occur in the present document, it is another description of the association relationship of another associated object, which means that there can be two relationships, for example, A / and B, which means that there are two cases of A alone and A and B together; in addition, for the character " / " which can occur in the present document, it generally means that the associated objects before and after are an "or" relationship.

[0032] Embodiment:

[0033] Referring to Figure 1 , the large-capacity cluster-level liquid-cooled energy storage management system provided by the embodiment can but is not limited to include: a plurality of battery clusters (RACK in Figure 1 ), a plurality of PCS modules, a plurality of circuit breakers, and an EMS management module; wherein each battery cluster corresponds to one PCS module and one circuit breaker, each battery cluster contains a plurality of battery packs, and each battery pack in each battery cluster is connected in series, so that the battery cluster of the energy storage container can be formed by the series connection of each battery pack.

[0034] At the same time, referring to Figure 1 , each battery cluster is electrically connected to the input end of the corresponding PCS module, and the output end of each PCS module is electrically connected to one end of one circuit breaker, wherein the plurality of battery clusters are divided into at least two groups, and the other ends of the circuit breakers corresponding to each group of battery clusters are connected in common and connected to the power grid, so that each battery cluster belonging to the same group is connected in parallel.

[0035] In the embodiment, the aforementioned circuit breaker (i.e. QF in Figure 1 ) can but is not limited to adopt a molded case circuit breaker, of course, the specific selection can be set according to the actual use, which is not limited here.

[0036] Thus, by the above design, the embodiment is equivalent to adopting a string mode to realize the connection of the battery cluster, that is, a plurality of battery packs (PACK) are connected in series to form a battery cluster, and a plurality of battery clusters are connected in parallel; based on this, in this way, the direct current side of the energy storage container is independent, that is, the direct current sides of each battery cluster are independent of each other and are not directly connected, which means that the voltage and current changes of each cluster will not directly affect other clusters, thereby reducing the possibility of direct current circulation, and because the direct current side is independent, the current can only flow through the battery packs inside the battery cluster, and cannot form a closed loop between the clusters, so direct current circulation cannot be formed; based on this, the influence of direct current circulation can be reduced as much as possible.

[0037] Further, referring to Figure 1 , the alternating current side of the energy storage container (that is, the output end of the PCS module corresponding to each battery cluster) is connected to the power grid through a circuit breaker, that is, each battery cluster can be turned on and off through the circuit breaker, so that each cluster of battery energy storage is independent of each other and does not affect each other, and can be independently or synchronously charged and discharged, so that the problem of system shutdown due to a cluster failure can be avoided, thereby improving the stability of the system.

[0038] In addition, in the embodiment, an EMS management module (that is, an energy management system controller) is also provided, wherein the EMS management module is respectively connected to each PCS module in communication, for receiving device signals sent by each PCS module and / or issuing control signals (such as on-off quantity signals, communication data, and shutdown signal lights issued by EMS) to each PCS module; thus, the embodiment is equivalent to concentrating the communication and control of each cluster into one set of EMS system for control, which can not only ensure independent operation of each cluster of battery system, but also can keep the voltage, current frequency, phase, and other power parameters of the alternating current of all clusters synchronized; therefore, in combination with the aforementioned string mode, a plurality of battery clusters can be independently or controlled to operate, thereby improving the flexibility of control.

[0039] Therefore, the embodiment provides an energy storage scheme with small direct current side circulation influence, stability, reliability, and flexible control, which is very suitable for large-scale application and promotion.

[0040] In one possible design, the following provides a more detailed technical scheme of the aforementioned large-capacity cluster-level liquid-cooled energy storage management system:

[0041] First, referring to Figure 1 , each battery cluster is equipped with a high-voltage box (that is, HVBOX in Figure 1 ), that is, each battery cluster corresponds to a high-voltage box, and any battery cluster is electrically connected to a target PCS module through the corresponding high-voltage box, and the target PCS module is the PCS module corresponding to the any battery cluster.

[0042] Optionally, see Figure 1 As shown, the high-voltage box may include, but is not limited to, a circuit protection unit, a first switching unit, and a second switching unit; wherein, for any battery cluster, the battery cluster is electrically connected to the input terminal of the circuit protection unit in the corresponding high-voltage box, the output terminal of the circuit protection unit is electrically connected to the input terminal of the second switching unit through the first switching unit, and the output terminal of the second switching unit is electrically connected to the PCS module corresponding to the battery cluster.

[0043] Furthermore, the specific circuit structures of the aforementioned circuit protection unit, first switching unit, and second switching unit are disclosed below.

[0044] In one specific implementation, the circuit protection unit may include, but is not limited to, a first fuse FU1 and a second fuse FU2, see [link to relevant documentation]. Figure 1 As shown, the positive terminal of any battery cluster is electrically connected to one end of the first fuse FU1 in the corresponding high-voltage box, and the negative terminal of any battery cluster is electrically connected to one end of the second fuse FU2 in the corresponding high-voltage box. The other ends of the first fuse FU1 and the second fuse FU2 serve as the output terminals of the circuit protection unit and are electrically connected to the input terminal of the second switch unit through the first switch unit.

[0045] Furthermore, for example, the first switching unit may include, but is not limited to, a QS switch, and the second switching unit includes a first switch KM1 and a second switch KM2; wherein, the connection structure of the aforementioned electronic devices is as follows:

[0046] See Figure 1 As shown, the other end of the first fuse FU1 is electrically connected to the first stationary terminal of the QS switch, and the other end of the second fuse FU2 is electrically connected to the second stationary terminal of the QS switch. The first moving terminal of the QS switch is electrically connected to one end of the first switch KM1, and the second moving terminal of the QS switch is electrically connected to one end of the second switch KM2. The other ends of the first switch KM1 and the second switch KM2 are respectively electrically connected to the input terminal of the PCS module corresponding to any battery cluster. Thus, by internally combining components such as the QS switch and fuses in a high-voltage box, high-voltage circuits can be effectively isolated to prevent electric shock and ensure the safety of personnel and equipment.

[0047] In specific implementation, one of the structures of the disclosed PCS module is as follows:

[0048] Among them, see Figure 1 As shown, the PCS module described in the example may include, but is not limited to, two energy storage converters (i.e., Figure 1The other end of the first switch KM1 and the second switch KM2 are electrically connected to the input end of the two energy storage converters, and the output end of the two energy storage converters is electrically connected to one end of the circuit breaker corresponding to any battery cluster.

[0049] Therefore, by the foregoing description, the embodiment is provided with one high-voltage box for each battery cluster, the high-voltage box is connected to two PCSs, the two PCSs are set to master-slave mode by the code setting and run in parallel and synchronously to form one energy storage converter unit (i.e. the PCS module) to meet the 1C charging and discharging requirement, and finally, the PCS module is connected to the AC bus copper bar through the molded case circuit breaker to be connected to the power grid.

[0050] Optionally, in the embodiment, for example, but not limited to, six battery clusters are set, and three battery clusters are divided into one group; each battery cluster contains five battery packs, and each battery pack contains a plurality of 1P battery cells, and the plurality of 1P battery cells are connected in series to form the battery pack (48 1P battery cells are preferably set in the embodiment, i.e. the battery cell unit adopts 285Ah 1P battery cells, and 48 battery cells are connected in series to form the battery pack, i.e. 1P48S PACK battery pack); therefore, the 1P charging and discharging energy storage battery cell (large-multiple charging and discharging energy storage battery cell) can be applied to various energy storage application scenarios such as peak load shifting, frequency modulation and anti-flow, and six such primary circuits are set in the container, and three primary circuits are connected to the power grid to meet the IC charging and discharging requirement.

[0051] In addition, the embodiment discloses one of the architectures of the EMS management module:

[0052] In the embodiment, for example, the EMS management module can include, but is not limited to, an EMS management unit, a first Ethernet switch, a second Ethernet switch, a switching unit and a BMS unit; the connection structure of the units is as follows:

[0053] As shown in Figure 2 The communication interface of each PCS module is connected to the EMS management unit through the second Ethernet switch, the switching interface of each PCS module is connected to the switching unit, the switching unit is connected to the first Ethernet switch, the first Ethernet switch is connected to the EMS management unit through the second Ethernet switch, the communication interface of each PCS module is connected to the communication interface of the BMS unit, and the BMS unit is connected to the first Ethernet switch.

[0054] In addition, the switch value interface of the BMS unit is also communicatively connected to the switch value unit; the switch value unit is communicatively connected to the first Ethernet switch, and the first Ethernet switch is communicatively connected to the EMS management unit through the second Ethernet switch; thus, the switch value unit can be used to realize rapid transmission of BMS fault signals.

[0055] Further, each PCS module is communicatively connected to the BMS unit through a CAN bus, and the communication between each PCS module and the second Ethernet switch, between the BMS unit and the first Ethernet switch, between the first Ethernet switch and the second Ethernet switch, and between the second Ethernet switch and the EMS management unit is all realized through a network cable.

[0056] The reason for using the communication structure of the secondary system is as follows:

[0057] The communication priority of the PCS and the EMS is the highest, and the data volume is the largest, and 12 PCSs (two energy storage converters corresponding to one battery cluster) all need to communicate with the EMS, therefore, the PCS communication is all connected to the second Ethernet switch through a network cable, and the second Ethernet switch is connected to the EMS controller unit through a network cable; the communication priority and data volume of the BMS and the EMS are inferior to the PCS, and the communication of 6 BMSs is all connected to the first Ethernet switch through a network cable, and the first Ethernet switch is connected to the second Ethernet switch; the switch value signals of the BMS and the PCS for fault and emergency shutdown are connected to the Ethernet switch value unit, and the Ethernet switch value unit is connected to the first Ethernet switch through a network cable; the PCS and the BMS further exchange data through a CAN; thus, the data exchange between the EMS, the BMS and the PCS can be realized, so as to ensure the reliability of the system.

[0058] In specific implementation, the energy storage container can also be provided with a liquid cooling system, a cabin-level fire extinguishing system and a PCAK-level fire extinguishing system, so as to maintain the reliability of the operation of the energy storage container.

[0059] Through the detailed description of the foregoing large-capacity cluster-level liquid cooling energy storage management system, the utility model has the following advantages:

[0060] (1) The primary power supply system of the entire cluster-level energy storage container system adopts an alternating current side group string type connection, and the direct current sides of each cluster are independent of each other, so that the influence of direct current circulating current can be reduced as much as possible.

[0061] (2) Each cluster alternating current side is connected and disconnected through a molded case circuit breaker, so that each cluster battery energy storage system is independent of each other and does not affect each other, and the post-maintenance and maintenance are facilitated.

[0062] (3) The 1P charge-discharge energy storage battery can be applied to various energy storage application scenarios such as peak load shifting, frequency modulation and harmonic elimination, and anti-flow prevention.

[0063] (4)The communication and control of each cluster of the secondary control system are centralized to one set of EMS system for control, so that the independent operation of each cluster of battery system can be ensured, and all clusters of alternating current voltage, current frequency, phase and other power parameters can be kept synchronous.

[0064] Finally, it should be noted that: the above only for the preferred embodiments of the utility model, and not for limiting the protection scope of the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model shall be included within the protection scope of the utility model.

Claims

1. A high-capacity cluster-level liquid-cooled energy storage management system, characterized in that, The application relates to a battery energy storage system, which comprises the following parts: a plurality of battery clusters and a plurality of PCS modules, wherein each battery cluster corresponds to one PCS module, each battery cluster comprises a plurality of battery packs, and the battery packs in each battery cluster are connected in series; each battery cluster is electrically connected to the input end of the corresponding PCS module, the output end of each PCS module is electrically connected to one end of a circuit breaker, a plurality of battery clusters are divided into at least two groups, the other ends of the circuit breakers corresponding to each battery cluster in each group are connected in common, and the circuit breakers are connected to a power grid, so that the battery clusters in the same group are connected in parallel; an EMS management module, wherein the EMS management module is communicatively connected to each PCS module, is used for receiving device signals sent by each PCS module and / or issuing control signals to each PCS module.

2. A large-capacity cluster-level liquid cooling energy storage management system according to claim 1, characterized in that, The application further comprises: a high-voltage box, wherein each battery cluster corresponds to one high-voltage box, any battery cluster is electrically connected to a target PCS module through the corresponding high-voltage box, and the target PCS module is the PCS module corresponding to the any battery cluster.

3. A large-capacity cluster-level liquid cooling energy storage management system according to claim 2, characterized in that, The high-voltage box comprises a circuit protection unit, a first switch unit and a second switch unit. For any battery cluster, the input end of the circuit protection unit in the corresponding high-voltage box is electrically connected to the any battery cluster, the output end of the circuit protection unit is electrically connected to the input end of the second switch unit through the first switch unit, and the output end of the second switch unit is electrically connected to the PCS module corresponding to the any battery cluster.

4. The large-capacity cluster-level liquid cooling energy storage management system according to claim 3, characterized in that, The circuit protection unit comprises a first fuse and a second fuse. One end of the first fuse in the corresponding high-voltage box is electrically connected to the positive electrode of the any battery cluster, one end of the second fuse in the corresponding high-voltage box is electrically connected to the negative electrode of the any battery cluster, and the other ends of the first fuse and the second fuse serve as the output end of the circuit protection unit and are electrically connected to the input end of the second switch unit through the first switch unit.

5. A large capacity cluster level liquid cooling energy storage management system according to claim 4, wherein, The first switch unit comprises a QS switch, and the second switch unit comprises a first switch and a second switch. The other end of the first fuse is electrically connected to the first fixed end of the QS switch, the other end of the second fuse is electrically connected to the second fixed end of the QS switch, the first movable end of the QS switch is electrically connected to one end of the first switch, the second movable end of the QS switch is electrically connected to one end of the second switch, and the other ends of the first switch and the second switch are respectively electrically connected to the input end of the PCS module corresponding to the any battery cluster.

6. A large capacity cluster level liquid cooling energy storage management system according to claim 5, wherein, The PCS module comprises two energy storage converters, wherein the other ends of the first switch and the second switch are electrically connected to the input end of the two energy storage converters, and the output ends of the two energy storage converters are electrically connected to one end of the circuit breaker corresponding to the any battery cluster.

7. The large capacity cluster level liquid cooling energy management system of claim 1, wherein, The EMS management module comprises an EMS management unit, a first Ethernet switch, a second Ethernet switch and a switch unit. The communication interface of each PCS module is connected to the EMS management unit through the second Ethernet switch, wherein the switch interface of each PCS module is connected to the switch unit, the switch unit is connected to the first Ethernet switch, and the first Ethernet switch is connected to the EMS management unit through the second Ethernet switch.

8. The large-capacity cluster-level liquid cooling energy storage management system according to claim 7, characterized in that, The EMS management unit further comprises a BMS unit. The communication interface of each PCS module is connected to the communication interface of the BMS unit, the BMS unit is connected to the first Ethernet switch, wherein the switch interface of the BMS unit is connected to the switch unit, the switch unit is connected to the first Ethernet switch, and the first Ethernet switch is connected to the EMS management unit through the second Ethernet switch.

9. The large capacity cluster level liquid cooling energy storage management system according to claim 8, wherein, Each PCS module is connected to the BMS unit through a CAN bus, and the communication between each PCS module and the second Ethernet switch, the communication between the BMS unit and the first Ethernet switch, the communication between the first Ethernet switch and the second Ethernet switch, and the communication between the second Ethernet switch and the EMS management unit are all realized through network cables.

10. The large capacity cluster level liquid cooling energy management system of claim 1, wherein, Any battery pack comprises a plurality of 1P battery cells, wherein the plurality of 1P battery cells are connected in series to form the any battery pack.

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