An energy storage battery system

Abstract

This utility model discloses an energy storage battery system, comprising at least one battery cluster and at least one high-voltage box, with one battery cluster connected to one high-voltage box; at least one resistance balancing adjustment unit equipped with a resistor, with one resistance balancing adjustment unit connected to one battery cluster, and each resistance balancing adjustment unit is disposed in the high-voltage box of each battery cluster; the resistance of the resistor is adjustable, and the resistance balancing adjustment unit uses the resistor to adjust the internal resistance of the corresponding battery cluster. This utility model solves the technical problem in the prior art where differences in internal resistance between battery clusters cause current distribution imbalance, thus affecting the safety and economy of the battery system.

Description

Technical Field

[0001] This utility model relates to the field of energy storage control technology, and in particular to an energy storage battery system. Background Technology

[0002] In centralized electrochemical energy storage systems, when multiple battery clusters are connected in parallel, differences in cell manufacturing processes, aging levels, and ambient temperatures can lead to variations in DC internal resistance between cells, resulting in inconsistent DC internal resistance between clusters and causing current distribution imbalance.

[0003] Long-term current imbalance can lead to wasted capacity of high-resistance battery clusters, and overload and accelerated aging of low-resistance battery clusters, and even trigger thermal runaway, threatening the safety and economy of energy storage systems. Utility Model Content

[0004] This utility model provides an energy storage battery system that solves the technical problem in the prior art where differences in internal resistance between battery clusters cause current distribution imbalance, which in turn affects the safety and economy of the battery system.

[0005] This utility model embodiment provides an energy storage battery system, the energy storage battery system comprising:

[0006] At least one battery cluster and at least one high-voltage box, with one battery cluster corresponding to one high-voltage box;

[0007] At least one resistance equalization adjustment unit equipped with a resistor is provided, and one of the battery clusters is connected to one resistance equalization adjustment unit. Each resistance equalization adjustment unit is set in the high voltage box of each battery cluster.

[0008] The resistance of the resistor is adjustable, and the resistance balancing adjustment unit uses the resistor to adjust the internal resistance of the corresponding battery cluster.

[0009] Furthermore, the energy storage battery system also includes a main control unit;

[0010] The main control unit is electrically connected to each of the resistance equalization adjustment units, and is used to perform equalization adjustment and resistance reduction adjustment on the internal resistance of each battery cluster in sequence using the resistance equalization adjustment units.

[0011] Furthermore, the resistance equalization adjustment unit also includes a sub-controller and a current acquisition module;

[0012] The sub-controller is electrically connected to the main control unit; the current acquisition module is electrically connected to the sub-controller;

[0013] The current acquisition module is used to acquire the current of the corresponding battery cluster;

[0014] The sub-controller is used to determine the internal resistance of the battery cluster based on the current of the battery cluster and transmit the internal resistance to the main control unit. It is also used to adjust the internal resistance of the resistor under the control of the main control unit.

[0015] Furthermore, the current acquisition module includes a shunt and a Hall sensor;

[0016] The shunt is disposed on the negative terminal connection line of the battery cluster and is used to obtain the current of the corresponding battery cluster;

[0017] The Hall sensor is installed on the positive terminal connection line of the battery cluster and is used as a backup current detection device to obtain the current of the corresponding battery cluster.

[0018] Furthermore, the resistance equalization adjustment unit includes at least one of the following: a normally closed main circuit switch, a relay subunit, and a fuse subunit;

[0019] The main circuit switch, the relay subunit, and the fuse subunit are all connected in series on the power connection line of the battery cluster.

[0020] Furthermore, the main circuit switch includes a first switch and a second switch that are connected in series;

[0021] The first switch is connected in series on the positive terminal connection line of the battery cluster;

[0022] The second switch is connected in series on the negative terminal connection line of the battery cluster.

[0023] Furthermore, the relay subunit includes a main positive relay and a main negative relay;

[0024] The main positive relay is connected in series on the positive terminal connection line of the battery cluster;

[0025] The main negative relay is connected in series on the negative terminal connection line of the battery cluster.

[0026] Furthermore, the fuse subunit includes a main positive fuse and a main negative fuse;

[0027] The main positive fuse is connected in series on the positive terminal connection line inside the high voltage box;

[0028] The main negative fuse is connected in series on the negative terminal connection line inside the high voltage box.

[0029] Furthermore, the resistor is connected in series on the positive terminal connection line of the battery cluster, and each battery cluster is connected to the busbar through its own high-voltage box.

[0030] Furthermore, the battery cluster includes multiple battery boxes connected in series, and each battery box includes multiple battery cells connected in series and / or in parallel.

[0031] This utility model discloses an energy storage battery system, comprising: at least one battery cluster and at least one high-voltage box, with one battery cluster connected to one high-voltage box; at least one resistance balancing adjustment unit equipped with a resistor, with one resistance balancing adjustment unit connected to one battery cluster, and each resistance balancing adjustment unit being disposed in the high-voltage box of each battery cluster; the resistance of the resistor is adjustable, and the resistance balancing adjustment unit uses the resistor to adjust the internal resistance of the corresponding battery cluster. This utility model solves the technical problem in the prior art where differences in internal resistance between battery clusters cause current distribution imbalance, thus affecting the safety and economy of the battery system. It achieves the technical effect of automatically adjusting the internal resistance balance between battery clusters in the energy storage battery system, ensuring the consistency of resistance within the cluster, improving system reliability and economy, extending system life, reducing the requirements for cell assembly, and improving system production efficiency. Attached Figure Description

[0032] Figure 1 This is a simplified circuit diagram of a centralized energy storage system;

[0033] Figure 2 This is a structural block diagram of an energy storage battery system provided in an embodiment of the present invention;

[0034] Figure 3 This is an electrical connection diagram of an energy storage battery system provided in an embodiment of this utility model;

[0035] Figure 4 This is a circuit connection diagram of the resistance equalization adjustment unit provided in this embodiment of the utility model. Detailed Implementation

[0036] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0037] It should be noted that the terms "first," "second," etc., in the specification, claims, and drawings of this utility model are used to distinguish different objects, not to limit a specific order. The various embodiments of this utility model described below can be performed individually, or they can be combined with each other; this utility model does not impose specific limitations in this regard.

[0038] Figure 1It is a simplified circuit of a centralized energy storage system, such as Figure 1 As shown, the BCP (Battery Collection Panel) in the energy storage system is equipped with positive and negative connection lines, and multiple battery clusters (RACKs) are connected in parallel on the positive and negative connection lines. Figure 1 To distinguish them, each battery cluster is named RACK1, RACK2, ..., RACK n.

[0039] for Figure 1 For the energy storage system shown, the simplified energy storage system is approximated as a purely resistive circuit, which can be obtained from the circuit formulas KCL (Kirchhoff's Current Law) and KVL (Kirchhoff's Voltage Law):

[0040] E1+i1(R 11 +R 12 )+U1=0;

[0041] E2+i2(R 21 +R 22 ) + U2 = 0;

[0042] ...

[0043] E n +i n (R n1 +R n2 )+U n =0;

[0044] Where i1+i2+…+i n =i0,R n1 =k*R cell R n2 =R harn =R harn +R PDU +R ec .

[0045] Among them, E n U1 is the total voltage within the battery cluster; U2 is the total voltage outside the battery cluster; i n i0 is the cluster current value; i0 is the requested current of the PCS (Power Conversion System, energy storage converter); R n1 R is the sum of the DCR (Direct Current Resistance) of each cell within the battery cluster; n2 R is the sum of the resistances of all individual cells in the battery cluster; k is the number of individual cells in the cluster; cell R is the DC internal resistance of a single battery cell; n is the number of battery clusters; harn R is the resistance of the wires in the energy storage system.PDU R is the internal resistance of the power distribution unit. ec This refers to the resistance of contacts and devices within the battery cluster, excluding individual battery cells.

[0046] When there is a case of high internal resistance in one battery cluster in the energy storage system, the impact of the DCR deviation of the battery cell on the current imbalance of the energy storage system is analyzed as follows:

[0047] The battery cell has a state of charge (SOC) of 40%, a discharge coefficient (DCR) range of 0.2mΩ to 0.35mΩ, and a PDU internal resistance R. PDU The resistance is 3mΩ. The PACK, excluding the individual cell DCR external contact and device internal resistance R... ec The resistance is 1.978 mΩ, and the internal resistance R of the wire is negligible. harn Due to the influence of (0.393mΩ / m@20℃), the PCS requested current i0 is n*160A.

[0048] When there are 12 battery clusters connected in parallel: i1 + 11 * i2 = i0;

[0049] When there are 8 battery clusters connected in parallel: i1 + 7 * i2 = i0;

[0050] When there are two battery clusters connected in parallel: i1 + i2 = i0;

[0051] The DCR value of the second battery cluster is close to the upper limit: R 21 =8 * 52 * 0.35 = 145.6 mΩ, R 22 =8*R ec +R PDU =18.824mΩ;

[0052] Other battery clusters have DCR values ​​that are close to the lower limit: R n1 =8 * 52 * 0.2 = 83.2 mΩ, R n2 =8*R ec +R PDU =18.824mΩ;

[0053] Therefore, when there are 12 battery clusters connected in parallel: i1 = 160.69A, i2 = 152.36A;

[0054] When there are 8 battery clusters connected in parallel: i1 = 161.62A, i2 = 148.64A;

[0055] When two battery clusters are connected in parallel: i1 = 197.47A, i2 = 122.53A;

[0056] In summary, (1) when there is a cluster with generally high internal resistance in the energy storage system, the more battery clusters there are, the smaller the impact of current imbalance; (2) when there is a cluster with generally high internal resistance in the energy storage system, when the number of battery clusters is ≥8, the inter-cluster current ΔI ≤ 15A, and the DCR range is 0.2mΩ~0.35mΩ, which meets the requirements; (3) when there is a cluster with generally low internal resistance in the energy storage system, similarly, when there are 12 battery clusters, i1=785.56A, i2=103.13A; when there are 8 battery clusters, i1=550.44A, i2=104.22A; when there are 2 battery clusters, i1=197.47A, i2=122.53A, which does not meet the requirements and needs to be controlled.

[0057] Therefore, for centralized energy storage systems, the difference in internal resistance between battery clusters can cause current imbalance.

[0058] In existing technologies, Battery Management Systems (BMS) primarily mitigate cell-level inconsistencies through individual cell voltage monitoring and passive / active balancing techniques. However, for system-level current imbalances caused by differences in internal resistance between battery clusters, firstly, individual cell balancing techniques cannot directly address the current distribution imbalance resulting from these differences; secondly, passive balancing (such as resistor discharge) is inefficient and puts significant heat dissipation pressure, making it difficult to handle cluster-level current deviations in large-capacity energy storage scenarios; while active balancing (such as inductive or capacitive energy transfer) is more efficient, it is costly and has a complex topology, hindering large-scale application. Furthermore, existing systems often rely on static parameter calibration or fixed threshold-triggered protection mechanisms, failing to dynamically adapt to changes in internal resistance and load fluctuations. This leads to some battery clusters being in an overcurrent state for extended periods, accelerating cell aging and even posing a risk of thermal runaway.

[0059] More seriously, when current distribution is uneven in parallel battery clusters, high-resistance battery clusters may experience reduced capacity utilization due to lower shunt current, while low-resistance battery clusters may suffer from increased cell polarization and abnormal temperature rise due to current overload, further exacerbating internal resistance parameter drift. This positive feedback effect significantly shortens battery system life and threatens the reliability of protective devices such as fuses and contactors. In extreme cases, circulating current in multi-cell parallel battery systems can even cause overcurrent protection failure in some battery clusters, resulting in system-wide safety accidents. Therefore, there is an urgent need for a technical solution that can sense the internal resistance differences between battery clusters in real time, dynamically optimize current distribution, and achieve multi-level coordinated control to improve the safety and economy of centralized energy storage systems.

[0060] Figure 2 This is a structural block diagram of an energy storage battery system provided in an embodiment of this utility model. Figure 3This is an electrical connection diagram of an energy storage battery system provided in an embodiment of this utility model. Figure 4 This is a circuit connection diagram of the resistance equalization adjustment unit provided in this embodiment of the utility model.

[0061] like Figures 2-4 As shown, the energy storage battery system includes:

[0062] At least one battery cluster 20 and at least one high-voltage box 21, with one battery cluster 20 connected to one high-voltage box 21.

[0063] At least one resistance equalization adjustment unit 30 is provided with a resistor R1. One resistance equalization adjustment unit 30 is connected to one battery cluster 20. Each resistance equalization adjustment unit 30 is provided in the high voltage box 21 of each battery cluster 20.

[0064] The resistance of resistor R1 is adjustable, and the resistance equalization adjustment unit 30 uses resistor R1 to adjust the internal resistance of the corresponding battery cluster 20.

[0065] Specifically, resistor R1 needs to be a high-precision resistor with an adjustment accuracy higher than the preset accuracy requirement to ensure the adjustment accuracy of resistance balancing. By adjusting each resistor R1, the internal resistance of each battery cluster 20 is balanced, ensuring the consistency of the resistance within the cluster. Setting the resistance balancing adjustment unit 30 in the high-voltage box 21 corresponding to each battery cluster 20 not only saves space, eliminating the need to reserve additional space for the resistance balancing adjustment unit 30, but also allows for a clear one-to-one correspondence between the resistance balancing unit 30 and the corresponding battery cluster 20, facilitating the internal structural layout of the energy storage battery system.

[0066] This invention solves the technical problem in the prior art where differences in internal resistance between battery clusters cause current distribution imbalance, which in turn affects the safety and economy of the battery system. It achieves the technical effect of automatically adjusting the internal resistance balance between battery clusters in the energy storage battery system, ensuring the consistency of resistance within the clusters. While improving system reliability and economy and extending system life, it also reduces the requirements for cell matching and improves system production efficiency.

[0067] Optionally, such as Figure 2 As shown, the energy storage battery system also includes a main control unit 10; the main control unit 10 is electrically connected to each resistance equalization adjustment unit 30, and is used to use the resistance equalization adjustment unit 30 to sequentially equalize and reduce the internal resistance of each battery cluster 20.

[0068] Specifically, the main control unit 10 obtains the internal resistance of the corresponding battery cluster 20 through the resistance equalization adjustment unit 30 at preset intervals. The preset interval can be set to days, weeks, months, etc. as needed. After obtaining the internal resistance of each battery cluster 20, a reference resistor is determined based on the obtained internal resistance, namely the first reference internal resistance. The resistance value of the resistor in each resistance equalization adjustment unit 30 is adjusted based on the first reference internal resistance to achieve balanced adjustment of the internal resistance of each battery cluster 20.

[0069] Preferably, for the convenience of resistance compensation, the first determination standard is selected as the maximum value of the internal resistance of the battery cluster 20 as the first reference internal resistance. In this way, when the equalization adjustment subunit 12 performs equalization adjustment, each other battery cluster 20 only needs to make up its own resistance value to the maximum value.

[0070] For example, an energy storage battery system includes ten battery clusters 20 connected in parallel. The main control unit 10 obtains the internal resistance of each battery cluster 20 through the resistance equalization adjustment unit 30 corresponding to each battery cluster 20, and takes the maximum value A among the obtained internal resistances as the first reference internal resistance. Then, at preset time intervals, with the first reference internal resistance as the target, the internal resistance of each battery cluster 20 is equalized by adjusting the resistance of the resistors in each resistance equalization adjustment unit 30. After equalization adjustment, the resistance value in each battery cluster 20 is A.

[0071] It should be noted that, as needed, the minimum, intermediate, or average value of the obtained internal resistance can also be selected as the first reference internal resistance, without any specific restrictions.

[0072] After equalization adjustment, the following situations may occur: First, this adjustment is not the first equalization adjustment. Before this adjustment, the internal resistance of battery cluster 20 may have been compensated. After several equalization adjustments, the resistance of battery cluster 20 is relatively large. Second, each equalization adjustment uses the maximum value of the internal resistance of each battery cluster 20 as the first reference internal resistance. The internal resistance of each battery cluster 20 is compensated to the first reference internal resistance, resulting in the resistance of each battery cluster 20 becoming larger and larger. Since the overall internal resistance of the energy storage battery system should not be too large, it may affect the stability of the overall power output. Therefore, after equalization adjustment, it is necessary to adjust the resistance of the already equalized internal resistance of each battery cluster 20.

[0073] Specifically, the main control unit 10 can obtain the current resistance value of each resistor R1 in the resistance equalization adjustment unit 30 after equalization adjustment; then, based on the current resistance value of each resistor R1, it determines the second reference internal resistance using a second determination criterion, wherein the second determination criterion is to determine the minimum value among the current resistance values ​​of each resistor as the second reference internal resistance.

[0074] It should be noted that if the maximum value of the current resistance of resistor R1 is used as the second reference internal resistance, the current resistance of other resistors R1 is insufficient to subtract the second reference internal resistance for adjustment. Therefore, the second determination standard needs to be set to the minimum value of the current resistance of each resistor R1 as the second reference internal resistance. In this way, each other resistor R1 only needs to reduce its own resistance to the minimum value, while the resistor R1 with the smallest current resistance can directly adjust its resistance to zero without needing to be connected in series with its corresponding battery cluster 20.

[0075] After equalization adjustment, the main control unit 10 will adjust the internal resistance of each battery cluster by reducing the resistance based on the second reference internal resistance. The second reference internal resistance is determined by the current resistance value of the resistor in each resistance equalization adjustment unit.

[0076] For example, after equalization adjustment, the main control unit 10 obtains the current resistance value of the resistor in each resistance equalization adjustment unit 30, and takes the minimum value B among the obtained current resistance values ​​as the second reference internal resistance. Then, with the minimum value B as the target, the resistance reduction adjustment of each battery cluster 20 is completed by reducing the current resistance value of the resistor in each resistance equalization adjustment unit 30 to the minimum value B. After the resistance reduction adjustment, the resistance value of each battery cluster 20 is (AB).

[0077] Optionally, such as Figure 4 As shown, the resistance equalization adjustment unit 30 also includes a sub-controller 32 and a current acquisition module 33;

[0078] The sub-controller 32 is electrically connected to the main control unit 10; the current acquisition module 33 is electrically connected to the sub-controller 32; the current acquisition module 33 is used to acquire the current of the corresponding battery cluster 20.

[0079] The sub-controller 32 is used to determine the internal resistance of the battery cluster 20 based on the current of the battery cluster 20 and transmit the internal resistance to the main control unit 10. It is also used to adjust the internal resistance of the resistor R1 under the control of the main control unit 10.

[0080] Specifically, the main control unit 10 is generally a first-level BMS, and one main control unit 10 is set in an energy storage battery system; the sub-controller 32 is generally a second-level BMS, and one sub-controller 32 is set in the resistance equalization adjustment unit 30 connected to each battery cluster 20.

[0081] The sub-controller 32 is connected to the positive terminal connection line B+ and the negative terminal connection line B- in the high-voltage box 21, respectively, with connection points BAT_P and BAT_N. The sub-controller 32 can obtain the current flowing through the corresponding battery cluster 20 through the current acquisition module 33, and use the current to calculate the internal resistance of the battery cluster 20 based on Ohm's law. Then, the calculated internal resistance is transmitted to the main control unit 10 for later use. It should be noted that the sub-controller 32 can also be configured to use other methods that can obtain the internal resistance of the battery cluster 20 to determine the internal resistance of the battery cluster 20 as needed. For example, the sub-controller 32 can use an external device to measure the internal resistance of the battery cluster 20 and transmit the measurement result to the main control unit 10. No specific restrictions are made here.

[0082] After receiving the internal resistance of each battery cluster 20 from each sub-controller 32, the main control unit 10 determines the first reference internal resistance; and sends the first reference internal resistance and the equalization adjustment command to each sub-controller 32, so that each sub-controller 32 adjusts the resistance value of its connected resistor R1 based on the first reference internal resistance and the equalization adjustment command, thus completing the equalization adjustment process. The sub-controller 32 and the resistor R1 are connected via RS485 or CAN line for communication.

[0083] Optionally, such as Figure 4 As shown, the current acquisition module 33 includes a shunt SH1 and a Hall sensor SH2;

[0084] Shunt SH1 is installed on the negative terminal connection line B- of battery cluster 20 to obtain the current of the corresponding battery cluster 20.

[0085] Hall sensor SH2 is installed on the positive terminal connection line B+ of battery cluster 20 and is used as a backup current detection device to obtain the current of the corresponding battery cluster 20.

[0086] Specifically, the shunt SH1 transmits a large amount of data, has a high acquisition frequency, and high detection accuracy. It is used to acquire the current of the battery cluster 20. Based on the current acquired by the shunt SH1 and the voltage of the battery cluster 20, the sub-controller 32 can calculate the internal resistance of the battery cluster 20 using Ohm's law. The Hall sensor SH2 serves as a backup detection device. Its acquisition frequency is lower than that of the shunt SH1. The current acquired by the Hall sensor SH2 can be used as a control group or reference value to detect the accuracy of the current acquired by the shunt SH1.

[0087] Optionally, such as Figure 4 As shown, the resistance equalization adjustment unit 30 includes at least one of the following: a normally closed main circuit switch 41, a relay subunit 42, and a fuse subunit 43; the main circuit switch 41, the relay subunit 42, and the fuse subunit 43 are all connected in series to the power connection line of the battery cluster 20.

[0088] Optionally, such as Figure 4 As shown, the main circuit switch 41 includes a first switch QF1-1 and a second switch QF1-2 connected in series; the first switch QF1-1 is connected in series on the positive terminal connection line B+ of the battery cluster 20; the second switch QF1-2 is connected in series on the negative terminal connection line B- of the battery cluster 20.

[0089] Specifically, the first switch QF1-1 includes a moving contact 1 and a stationary contact 2, the second switch QF1-2 includes a moving contact 3 and a stationary contact 4, and the main circuit switch 41 is a normally closed switch, which is used for isolation protection. When it is necessary to inspect or maintain the energy storage battery system or any other time when it is necessary to disconnect the resistor R1, the main circuit switch 41 is opened.

[0090] Optionally, such as Figure 4 As shown, the relay subunit 42 includes a main positive relay KM1 and a main negative relay KM2; the main positive relay KM1 is connected in series on the positive terminal connection line B+ of the battery cluster 20; the main negative relay KM2 is connected in series on the negative terminal connection line B- of the battery cluster 20.

[0091] Specifically, the main positive relay KM1 and the main negative relay KM2 are used to power on and off the resistance equalization adjustment unit 30 by opening and closing.

[0092] Optionally, such as Figure 4 As shown, the fuse subunit 43 also includes a main positive fuse FU1 and a main negative fuse FU2; the main positive fuse FU1 is connected in series on the positive terminal connection line B+ of the battery cluster 20; the main negative fuse FU2 is connected in series on the negative terminal connection line B- of the battery cluster 20.

[0093] Specifically, the main positive fuse FU1 and the main negative fuse FU2 are used to provide overcurrent protection for the devices on the positive connection line B+ and the negative connection line B-.

[0094] Optionally, such as Figure 3 and Figure 4 As shown, resistor R1 is connected in series on the positive terminal connection line B+ of battery cluster 20, and each battery cluster 20 is connected to the busbar (including the positive busbar P+ and the negative busbar P-) through its own high voltage box 21.

[0095] Optionally, such as Figure 3 As shown, the battery cluster 20 includes a plurality of battery boxes 22 connected in series; each of the battery boxes 22 includes a plurality of battery cells connected in series and / or in parallel.

[0096] Specifically, the individual battery cells inside the battery box can be as follows: Figure 3The cells are connected in series as shown and then encapsulated in a battery box. Alternatively, several battery cells can be connected in parallel first, and then multiple sets of parallel battery cells can be connected in series. No specific limitation is made here. In this embodiment of the invention, the battery box 22 can be a 1P52S battery module.

[0097] The main control unit of the energy storage battery system provided in this embodiment uses the equalization control method of the energy storage battery system in the above embodiment. Therefore, the energy storage battery system provided in this embodiment also has the beneficial effects described in the above embodiment, which will not be repeated here.

[0098] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0099] Finally, it should be noted that the above are merely preferred embodiments and the technical principles applied in this utility model. Those skilled in the art will understand that this utility model is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the protection scope of this utility model. Therefore, although the utility model has been described in detail through the above embodiments, this utility model is not limited to the above embodiments. Many other equivalent embodiments may be included without departing from the concept of this utility model, and the scope of this utility model is determined by the scope of the appended claims.

Claims

1. An energy storage battery system, characterized in that, The energy storage battery system includes: At least one battery cluster and at least one high-voltage box, wherein one battery cluster is connected to one high-voltage box; At least one resistance equalization adjustment unit equipped with a resistor, one of the battery clusters is connected to one resistance equalization adjustment unit, and each resistance equalization adjustment unit is set in the high voltage box of each battery cluster. The resistance of the resistor is adjustable, and the resistance balancing adjustment unit uses the resistor to adjust the internal resistance of the corresponding battery cluster.

2. The energy storage battery system according to claim 1, characterized in that, The energy storage battery system also includes a main control unit; The main control unit is electrically connected to each of the resistance equalization adjustment units, and is used to perform equalization adjustment and resistance reduction adjustment on the internal resistance of each battery cluster in sequence using the resistance equalization adjustment units.

3. The energy storage battery system according to claim 2, characterized in that, The resistance equalization adjustment unit also includes a sub-controller and a current acquisition module; The sub-controller is electrically connected to the main control unit; the current acquisition module is electrically connected to the sub-controller; The current acquisition module is used to acquire the current of the corresponding battery cluster; The sub-controller is used to determine the internal resistance of the battery cluster based on the current of the battery cluster, and is also used to adjust the internal resistance of the resistor under the control of the main control unit.

4. The energy storage battery system according to claim 3, characterized in that, The current acquisition module includes a shunt and a Hall sensor; The shunt is disposed on the negative terminal connection line of the battery cluster and is used to obtain the current of the corresponding battery cluster; The Hall sensor is installed on the positive terminal connection line of the battery cluster and is used as a backup current detection device to obtain the current of the corresponding battery cluster.

5. The energy storage battery system according to any one of claims 1-4, characterized in that, The resistance equalization adjustment unit includes at least one of the following: a normally closed main circuit switch, a relay subunit, or a fuse subunit; The main circuit switch, the relay subunit, and the fuse subunit are all connected in series on the power connection line of the battery cluster.

6. The energy storage battery system according to claim 5, characterized in that, The main circuit switch includes a first switch and a second switch that are connected in series. The first switch is connected in series on the positive terminal connection line of the battery cluster; The second switch is connected in series on the negative terminal connection line of the battery cluster.

7. The energy storage battery system according to claim 5, characterized in that, The relay subunit includes a main positive relay and a main negative relay; The main positive relay is connected in series on the positive terminal connection line of the battery cluster; The main negative relay is connected in series on the negative terminal connection line of the battery cluster.

8. The energy storage battery system according to claim 5, characterized in that, The fuse subunit includes a main positive fuse and a main negative fuse; The main positive fuse is connected in series on the positive terminal connection line inside the high voltage box; The main negative fuse is connected in series on the negative terminal connection line inside the high voltage box.

9. The energy storage battery system according to any one of claims 1-4, characterized in that, The resistor is connected in series on the positive terminal connection line of the battery cluster, and each battery cluster is connected to the busbar through its own high-voltage box.

10. The energy storage battery system according to any one of claims 1-4, characterized in that, The battery cluster includes multiple battery boxes connected in series, and each battery box includes multiple battery cells connected in series and / or in parallel.

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