CN-122025909-A - Energy storage device, energy storage system and charging network

Abstract

The application relates to the technical field of energy storage devices, and provides an energy storage device, an energy storage system and a charging network, wherein the energy storage device comprises a battery device and a thermal management module, the thermal management module comprises a liquid cooling unit, a liquid cooling pipeline and a multi-stage parallel pipe, the liquid cooling pipeline and the multi-stage parallel pipe are connected in series, and the liquid cooling unit is communicated with a heat exchange structure on the battery device through the liquid cooling pipeline and the multi-stage parallel pipe; the multi-stage parallel tube comprises a liquid inlet tube section, a liquid outlet tube section and a plurality of branch pipelines which are arranged in parallel between the liquid inlet tube section and the liquid outlet tube section, wherein the liquid inlet tube section is communicated with a liquid cooling unit or a liquid cooling pipeline, and the liquid outlet tube section is communicated with a heat exchange structure or a liquid cooling pipeline.

Inventors

• YANG TING
• LIU HONGBIAO
• LI QING
• ZHANG KAIWEN
• LI SHAOWEI

Assignees

• 宁德时代新能源科技股份有限公司

Dates

Publication Date

20260512

Application Date

20241112

Claims (12)

1. 1. An energy storage device is characterized by comprising A battery device provided with a heat exchange structure thereon, and The heat management module comprises a liquid cooling unit, a liquid cooling pipeline and a multi-stage parallel pipe, wherein the liquid cooling pipeline and the multi-stage parallel pipe are connected in series, and the liquid cooling unit is communicated with the heat exchange structure through the liquid cooling pipeline and the multi-stage parallel pipe; the multistage parallel tube comprises a liquid inlet tube section, a liquid outlet tube section and a plurality of branch pipelines which are arranged in parallel between the liquid inlet tube section and the liquid outlet tube section, wherein the liquid inlet tube section is communicated with the liquid cooling unit or the liquid cooling pipeline, and the liquid outlet tube section is communicated with the heat exchange structure or the liquid cooling pipeline.
2. 2. The energy storage device of claim 1, wherein a plurality of said battery devices are stacked into at least one battery assembly; the liquid cooling pipeline comprises a first pipeline, a second pipeline and a third pipeline, one end of the first pipeline is connected with the liquid cooling unit, one end of the second pipeline is communicated with the first pipeline, the other end of the second pipeline extends towards the battery assembly, one end of the third pipeline is communicated with the second pipeline, and the other end of the third pipeline is connected with the heat exchange structure in the corresponding battery assembly; The first pipeline is provided with the multi-stage parallel pipes in series, and/or the second pipeline is provided with the multi-stage parallel pipes in series, and/or the third pipeline is provided with the multi-stage parallel pipes in series.
3. 3. The energy storage device of claim 2, wherein the multi-stage parallel tube is connected in series to the second pipeline, the liquid inlet tube section is connected to the first pipeline or the second pipeline, and the liquid outlet tube section is connected to the second pipeline or the third pipeline.
4. 4. The energy storage device of claim 3, further comprising a box body, wherein a plurality of battery assemblies are arranged in the box body, the first pipeline is positioned below the battery assemblies and extends along the arrangement direction of the battery assemblies in the height direction of the box body, the second pipelines are uniformly distributed on the periphery of each battery assembly, and the second pipelines extend along the height direction of the box body and are communicated with the first pipeline; The multi-stage parallel pipes are arranged on the second pipeline in series, and the multi-stage parallel pipes are positioned below the battery assembly.
5. 5. The energy storage device as claimed in claim 1 to 4, wherein the number of the multi-stage parallel pipes is plural, and the plural multi-stage parallel pipes are serially connected to the liquid cooling pipeline.
6. 6. The energy storage device as set forth in claim 5, wherein said liquid outlet section of a last one of said at least two adjacent multi-stage parallel pipes is connected to said liquid inlet section of a next one of said multi-stage parallel pipes in a flow direction of the cooling medium.
7. 7. The energy storage device as defined in any one of claims 1 to 6, wherein in at least one of said multiple parallel pipes, the length of each of said branch pipes is the same.
8. 8. The energy storage device as defined in any one of claims 1 to 7, wherein in any one of said multiple parallel pipes, the number of branch pipes is two, three or four.
9. 9. The energy storage device as claimed in claim 1 to 8, wherein in at least one of said multiple parallel pipes, at least one of said branch pipes has an inner diameter larger than an inner diameter of said inlet pipe section or said outlet pipe section.
10. 10. The energy storage device as claimed in any of claims 1 to 9, wherein at least part of the branch line is a flexible pipe section.
11. 11. An energy storage system comprising a power conversion device for electrically connecting a power generation device and an energy storage device according to any one of claims 1 to 10.
12. 12. A charging network comprising a charging pile and an energy storage device according to any one of claims 1 to 10 or an energy storage system according to claim 11, the energy storage device being arranged to provide electrical energy to the charging pile.

Description

Energy storage device, energy storage system and charging network Technical Field The application relates to the technical field of energy storage devices, and particularly provides an energy storage device, an energy storage system and a charging network. Background New energy batteries are increasingly used in life and industry, for example, new energy automobiles having a battery mounted therein have been widely used, and in addition, batteries are increasingly used in the field of energy storage and the like. The energy storage device is used as a supplementing and standby system of the power grid, and a battery device in the energy storage device can generate more heat under a high-power running state. Therefore, the energy storage device has high requirements on the flow characteristics of the cooling medium of the thermal management module, and the flow characteristics of the cooling medium have great influence on the service life of the battery device. However, the flow rate is limited by the overall pressure resistance of the pipeline of the thermal management module of the energy storage device, and when the internal pressure of the pipeline exceeds a certain limit value, the pipeline may be broken, and meanwhile, the flow resistance is too large, so that the energy consumption of the unit is too large. Disclosure of Invention An embodiment of the application aims to provide an energy storage device, an energy storage system and a charging network, and aims to solve the problem that a pipeline flow resistance of a heat management module of the energy storage device in the related art is large to influence the flow of cooling medium in a pipeline. In order to achieve the above purpose, the technical scheme adopted by the embodiment of the application is as follows: In a first aspect, an embodiment of the application provides an energy storage device, which comprises a battery device and a thermal management module, wherein a heat exchange structure is arranged on the battery device, the thermal management module comprises a liquid cooling unit, a liquid cooling pipeline and a multi-stage parallel pipe, the liquid cooling pipeline and the multi-stage parallel pipe are connected in series, the liquid cooling unit is communicated with the heat exchange structure through the liquid cooling pipeline and the multi-stage parallel pipe, the multi-stage parallel pipe comprises a liquid inlet pipe section, a liquid outlet pipe section and a plurality of branch pipelines which are arranged between the liquid inlet pipe section and the liquid outlet pipe section in parallel, the liquid inlet pipe section is communicated with the liquid cooling unit or the liquid cooling pipeline, and the liquid outlet pipe section is communicated with the heat exchange structure or the liquid cooling pipeline. The energy storage device has the advantages that the cooling medium can be led into the heat exchange structure through the liquid cooling pipeline and the multi-stage parallel pipes which are connected in series, so that the cooling medium can exchange heat in the heat exchange structure to realize heat dissipation of the battery device, the multi-stage parallel pipes are used for conducting the cooling medium in a mode of connecting the multi-stage parallel pipes with the liquid cooling pipeline in series, namely, the multi-stage parallel pipes replace part of the liquid cooling pipeline, the multi-stage parallel pipes are connected between the liquid inlet pipeline section and the liquid outlet pipeline section in parallel, the cooling medium can be split into a plurality of flow channels in the plurality of parallel branch pipelines, and therefore, the flow resistance between the liquid inlet pipeline section and the liquid outlet pipeline section can be effectively reduced. In some embodiments, a plurality of battery devices are stacked to form at least one battery assembly, the liquid cooling pipeline comprises a first pipeline, a second pipeline and a third pipeline, one end of the first pipeline is connected with the liquid cooling unit, one end of the second pipeline is communicated with the first pipeline, the other end of the second pipeline extends towards the battery assembly, one end of the third pipeline is communicated with the second pipeline, the other end of the third pipeline is connected with a heat exchange structure in the corresponding battery assembly, multiple stages of parallel pipes are arranged on the first pipeline in series, and/or multiple stages of parallel pipes are arranged on the second pipeline in series, and/or multiple stages of parallel pipes are arranged on the third pipeline in series. By adopting the technical scheme, the first pipeline is used for connecting the liquid cooling unit and is used for directly conducting the cooling medium with the cooling unit, the second pipeline is used for transmitting the cooling medium to the direction of the battery assembly, and the third