CN-122029673-A - Energy storage device and energy system

CN122029673ACN 122029673 ACN122029673 ACN 122029673ACN-122029673-A

Abstract

The energy storage device (200) and the energy source system (300), wherein the energy storage device (200) comprises two or more battery systems (2), each battery system (2) comprises a plurality of sub-battery systems (22), the number of the bidirectional current conversion modules (120) is M1, the number of the sub-battery systems (22) is N, and M1 bidirectional current conversion modules (120) are respectively connected with N/M1 sub-battery systems (22), wherein M1 and N are positive integers.

Inventors

LI JING
CHEN MING
LI JIAQI
ZHANG KAIWEN
WANG LEI
LAI YUAN

Assignees

宁德时代新能源科技股份有限公司

Dates

Publication Date: 20260512
Application Date: 20240618
Priority Date: 20240408

Claims (20)

An energy storage device, comprising: two or more battery systems, each including a plurality of sub-battery systems; The bidirectional current conversion modules are M1 in number; The number of the sub-battery systems is N, M1 bidirectional current transformation modules are respectively connected with N/M1 sub-battery systems, wherein M1 and N are positive integers.
The energy storage device of claim 1, wherein the sub-battery system comprises a plurality of battery clusters, each battery cluster comprising at least one battery, the batteries in each battery cluster being arranged in a same row or a same column.
The energy storage device of claim 1, further comprising: The box body is of a hollow structure, and a plurality of sub-battery systems in the battery system are arranged in the hollow structure.
The energy storage device of claim 2, further comprising: And the control box, wherein the plurality of battery clusters are electrically connected to the same control box.
The energy storage device of claim 2, further comprising: The quantity of the control boxes is multiple, and the multiple battery clusters are respectively and electrically connected to different control boxes.
The energy storage device of claim 4 or 5, wherein all of said control boxes are disposed at the bottom of said plurality of battery clusters, said bottom being below said plurality of battery clusters when said energy storage device is in use, or All the control boxes are arranged between at least two adjacent battery clusters in the plurality of battery clusters, or All the control boxes are arranged at the tops of the battery clusters, and the tops are above the battery clusters under the condition that the energy storage device is in a use state.
The energy storage device of claim 5, wherein a portion of the plurality of control boxes is disposed at a bottom or top of the plurality of battery clusters, and another portion of the control boxes is disposed between two adjacent battery clusters of the plurality of battery clusters, the bottom being below the plurality of battery clusters with the energy storage device in use, and the top being above the plurality of battery clusters with the energy storage device in use.
The energy storage device of any one of claims 4 to 7, wherein one control box comprises the same number of control units as the number of electrically connected battery clusters, the control units being configured to control the corresponding battery clusters.
The energy storage device of any of claims 2-8, wherein each of the battery clusters comprises a plurality of batteries, the energy storage device further comprising: a thermal management assembly connected to each of the cells in the plurality of clusters for regulating the temperature of each of the cells.
The energy storage device of claim 9, wherein the thermal management assembly comprises a liquid cooling unit, a main liquid inlet conduit connected to a liquid outlet of the liquid cooling unit, a main liquid return conduit connected to a liquid inlet of the liquid cooling unit, and a plurality of sub-conduits; The plurality of sub-pipelines are connected in parallel with the main liquid inlet pipeline and the main liquid return pipeline, each of the plurality of sub-pipelines is connected with each battery respectively, wherein cooling medium output by the liquid cooling unit flows into the sub-pipeline through the main liquid inlet pipeline, and the cooling medium flows out of the main liquid return pipeline and enters the liquid cooling unit through the sub-pipeline after exchanging heat with the corresponding battery.
The energy storage device of claim 9, wherein the thermal management assembly comprises a liquid chiller unit, a total liquid return conduit connected to a liquid chiller unit liquid outlet, a total liquid return conduit connected to the liquid chiller unit liquid inlet, a plurality of main liquid inlet conduits connected to the total liquid inlet conduit, a plurality of main liquid return conduits connected to the total liquid return conduit, and a plurality of sub-conduits; The plurality of sub-pipelines are connected in parallel with the main liquid inlet pipeline and the main liquid return pipeline, each sub-pipeline in the plurality of sub-pipelines is respectively connected with each battery, wherein a cooling medium output by the liquid cooling unit flows into one main liquid inlet pipeline in the plurality of main liquid inlet pipelines through the main liquid inlet pipeline, flows into the corresponding sub-pipeline through the main liquid inlet pipeline, and flows out to one main liquid return pipeline corresponding to the main liquid inlet pipeline through the corresponding sub-pipeline after heat exchange between the cooling medium and the corresponding battery, and flows into the main liquid return pipeline through the main liquid return pipeline so as to enter the liquid cooling unit.
The energy storage device of any one of claims 9 to 11, wherein the plurality of cells of each of the battery clusters are connected in series.
The energy storage device of any one of claims 9 to 12, further comprising an electrical compartment, the electrical compartment having electrical components disposed therein; Wherein, electrical component with thermal management subassembly set up respectively in the both sides of first partition wall, just electrical component with thermal management subassembly set up in the same side of second partition wall, a plurality of the battery respectively with electrical component with thermal management subassembly set up in the different sides of second partition wall.
The energy storage device of any one of claims 2 to 13, further comprising a battery rack on which the battery is placed.
The energy storage device of any one of claims 1 to 14, wherein the sub-battery system comprises four rows of cells, each row of cells being divided into 2 clusters side by side, each cluster comprising 4 cells, each cell comprising 104 cells connected in series.
The energy storage device of claim 2, further comprising: And the insulation detection assembly is electrically connected to the same insulation detection assembly and is used for monitoring the insulation state of the connected battery clusters.
The energy storage device of claim 2, further comprising: Insulation detection components, the quantity of insulation detection components is a plurality of, the quantity of insulation detection components is M3, the quantity of battery clusters is M2, every insulation detection component is connected And M2 and M3 are positive integers greater than one, Representing rounding up M2/M3.
The energy storage device of claim 1, further comprising: The number of the insulation detection assemblies is the same as that of the sub-battery systems, and the insulation detection assemblies are connected with the sub-battery systems one by one.
The energy storage device of claim 2, further comprising: The bidirectional current transformation modules are M1 in number, M2 in number and connected with each other And M1 and M2 are positive integers greater than one, Representing rounding up M2/M1.
The energy storage device of claim 2, further comprising: And the general control unit is used for monitoring state information of the plurality of battery clusters, wherein the state information comprises one or more of current information, voltage information, power information or temperature information.

Description

Energy storage device and energy system Cross Reference to Related Applications The present application claims priority from PCT international application PCT/CN2024/086685 entitled "energy storage device and energy system" filed on 8 th 4 of 2024, the entire contents of which are incorporated herein by reference. Technical Field The application relates to the technical field of energy storage, in particular to an energy storage device and an energy system. Background Under the large background of increasing the support force for the development of new energy technology in the world, various technologies related to energy storage are widely applied. The performance of the energy storage device has a large impact on its development. But the performance of the current energy storage devices is not adequate. Disclosure of Invention The application aims to provide an energy storage device and an energy source system, which can improve the energy density of the energy storage device. The invention provides an energy storage device, which comprises two or more battery systems, bidirectional current conversion modules and N/M1 bidirectional current conversion modules, wherein each battery system comprises a plurality of sub-battery systems, the number of the bidirectional current conversion modules is M1, and the number of the sub-battery systems is N, and the M1 bidirectional current conversion modules are respectively connected with the N/M1 sub-battery systems, wherein M1 and N are positive integers. In the above embodiment, each sub-battery system may share the bidirectional current converting module, so that the number of requirements on the bidirectional current converting modules can be reduced, and the size requirement of the energy storage device can be reduced. In an alternative embodiment, the sub-battery system comprises a plurality of battery clusters, each battery cluster comprising at least one battery, the batteries in each battery cluster being arranged in the same row or column. In an alternative embodiment, the battery pack further comprises a box body, wherein the box body is of a hollow structure, and a plurality of sub-battery systems in the battery system are arranged in the hollow structure. In the embodiment, one row or one column of batteries is divided into a plurality of parallel battery clusters, and the arrangement mode of the battery clusters can be used for better decomposing the high-capacity energy storage device, namely, the energy density of the energy storage device can be improved, and on the other hand, the size of the energy storage device can be standard, so that the transportation cost of the energy storage device is reduced. That is, embodiments of the present application facilitate standardization of energy storage devices and reduction in transportation costs. In addition, the temperature of each cell in each cell cluster is different, and the larger the number of cells in a cell cluster is, the larger the temperature difference between the cells in the cell cluster is, or the larger the distance between the two cells is, the larger the temperature difference between the two cells is. According to the embodiment of the application, one row or one line of batteries is divided into a plurality of parallel battery clusters, so that the number of batteries in each battery cluster is relatively reduced or the distance between different batteries is relatively reduced, thereby effectively reducing the temperature difference in the clusters and improving the efficiency of temperature management. In an alternative embodiment, the energy storage device further comprises a control box, wherein the plurality of battery clusters are electrically connected to the same control box. In the above embodiment, the plurality of battery clusters are electrically connected to the same control box, that is, the plurality of branches are converged to one control box, on the one hand, the number of harness connections or structural members can be reduced, thereby reducing the cost, and the installation and subsequent maintenance can be easier and quicker. On the other hand, the quantity of the control boxes can be reduced, so that the cost of the energy storage device can be effectively reduced, the space inside the energy storage device occupied by the control boxes can be reduced, and the size space arrangement in the height direction of the boxes can be saved. In an alternative embodiment, the energy storage device further comprises a plurality of control boxes, and the plurality of battery clusters are respectively and electrically connected to different control boxes. In the embodiment, the plurality of battery clusters are respectively and electrically connected to different control boxes, so that the implementation is simple and the control is convenient. In an alternative embodiment, all the control boxes are arranged at the bottoms of the battery clusters, wherein the bottoms are belo