Centralized temperature control system and energy storage system

Abstract

The utility model provides a centralized temperature control system and an energy storage system, and mainly solves the problem of high cost of the existing energy storage system. The centralized temperature control system comprises a heat exchange unit, a heat conveying unit and a heat processing unit, the heat exchange unit is used for exchanging heat with each battery module in the energy storage equipment; the heat conveying unit is used for conveying a heat transfer medium between the N energy storage devices and the heat treatment unit; the heat treatment unit is used for performing heat treatment on the heat transfer medium conveyed by the heat conveying unit; the heat transfer unit comprises a liquid supply main pipeline, a liquid return main pipeline, N groups of liquid inlet pipelines and N groups of liquid outlet pipelines; the liquid supply main pipeline and the liquid return main pipeline are buried underground, and the underground temperature is relatively low relative to the overground temperature, so that the liquid return main pipeline and the underground environment are subjected to sufficient heat exchange, heat of a heat transfer medium in the liquid return main pipeline is dissipated into the ground, the environment temperature is utilized to the maximum extent, and the temperature control cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of energy storage batteries, and specifically relates to a centralized temperature control system and an energy storage system. Background Art

[0002] With the development of new energy sources such as solar energy and wind energy, energy storage technology has also developed. Lithium batteries have gradually become the mainstream product for energy storage due to their advantages such as high energy, long service life, high rated voltage, high power tolerance and low self-discharge rate.

[0003] With the large-scale application of lithium battery energy storage equipment, the safe use of lithium-ion batteries has also attracted attention. In order to ensure the safe and reliable operation of energy storage equipment, the energy storage equipment is equipped with a temperature control system to control the temperature of each battery module in the energy storage equipment, so that each battery module always works in a suitable temperature environment. However, the temperature control system configured separately for each energy storage device makes the cost of the entire energy storage system high. Summary of the invention

[0004] In order to solve the problem of high cost of existing energy storage systems, the utility model provides a centralized temperature control system and an energy storage system.

[0005] In order to achieve the above object, the technical solution of the utility model is:

[0006] A centralized temperature control system, comprising a heat exchange unit, a heat delivery unit and a heat treatment unit; the heat exchange unit is used to exchange heat with each battery module in an energy storage device; the heat delivery unit is used to realize the delivery of heat transfer medium between N energy storage devices and the heat treatment unit; the heat treatment unit is used to perform heat treatment on the heat transfer medium delivered by the heat delivery unit; the heat delivery unit comprises a liquid supply main line, a liquid return main line and N groups of liquid inlet pipelines and N groups of liquid outlet pipelines; the liquid supply main line is respectively connected to the heat treatment unit and the N groups of liquid inlet pipelines, and is used to heat the heat treatment unit The heat transfer medium in the element is diverted to N energy storage devices; each group of liquid inlet pipelines is respectively connected to the heat exchange unit of a single energy storage device, and is used to divert the heat transfer medium in the liquid supply main pipeline to the heat exchange unit of each battery module; each group of liquid outlet pipelines is respectively connected to the heat exchange unit of a single energy storage device, and is used to converge the heat transfer medium after heat exchange with each battery module into the liquid return main pipeline; the liquid return main pipeline is respectively connected to the heat treatment unit and N groups of liquid outlet pipelines, and is used to converge the heat transfer medium in N energy storage devices to the heat treatment unit; the liquid supply main pipeline and the liquid return main pipeline are both buried underground.

[0007] Furthermore, a heat preservation and insulation layer is provided on the liquid supply main line, and a heat sink is provided on the liquid return main line.

[0008] Furthermore, the liquid supply main pipeline and the liquid return main pipeline are buried at a depth below the frozen soil layer.

[0009] Furthermore, the liquid inlet pipeline and the liquid outlet pipeline are provided with flow regulating devices, and the delivery pump of the heat treatment unit is a variable frequency pump.

[0010] Furthermore, the inlet and outlet of the heat treatment unit are provided with blocking joints, and the blocking joints can block the heat transfer medium in the heat treatment unit.

[0011] Furthermore, the heat processing unit is arranged in an empty energy storage box.

[0012] The utility model provides an energy storage system, comprising a plurality of energy storage devices and the above-mentioned centralized temperature control system, wherein the energy storage devices comprise an energy storage box and a plurality of battery modules arranged in the energy storage box, and each battery module is connected to a heat exchange unit for heat exchange.

[0013] Furthermore, the battery module includes an outer shell and a plurality of single cells; the plurality of single cells are arranged in the outer shell in the same direction; the outer shell is provided with a shared chamber, the inner cavity of the shared chamber is connected with the inner cavities of all the single cells; avoidance holes are provided on the top plate of the outer shell corresponding to the polarity terminals of each single cell; the polarity terminals of each single cell extend out of the avoidance holes, and the top plate area of ​​the outer shell corresponding to the avoidance holes is fixedly sealed with the shell of the single cell.

[0014] Furthermore, the heat exchange unit includes at least one heat transfer tube, and a clamping portion is provided on the polarity terminal of the battery module. Each heat transfer tube is fixed on the clamping portion of each battery module in a one-to-one correspondence, and the heat transfer tube is insulated from each battery module; the clamping portion is a through groove or through hole opened at the position where the polarity terminal of each single battery extends out of the avoidance hole.

[0015] Furthermore, the heat transfer tube is a metal tube, and the metal tube has at least one of an insulating layer and an insulating sleeve.

[0016] Compared with the prior art, the technical solution of the utility model has the following advantages:

[0017] 1. The utility model provides a centralized temperature control system, which includes a heat exchange unit, a heat transfer unit and a heat processing unit. The heat exchange unit is used to exchange heat with each battery module in the energy storage device; the heat transfer unit is used to realize the transmission of heat transfer medium between N energy storage devices and the heat processing unit, and the heat processing unit is used to perform heat treatment on the heat transfer medium transported by the heat transfer unit. The centralized temperature control system performs unified and centralized thermal management on multiple energy storage devices in the energy storage system. Compared with the solution of setting up a temperature control system for each energy storage device in the existing energy storage system, multiple energy storage devices share a set of temperature control systems, which not only greatly reduces the production cost of the entire energy storage system, but also facilitates the maintenance and management of the entire energy storage system.

[0018] At the same time, the liquid supply main line and the liquid return main line of the heat transfer unit in the above-mentioned temperature control system are buried underground. Compared with the temperature on the ground, the underground temperature is relatively low, so that the liquid return main line can fully exchange heat with the underground environment, and the heat of the heat transfer medium in the liquid return main line can be dissipated into the ground as much as possible, thereby maximizing the use of ambient temperature, reducing temperature control energy consumption, effectively saving energy, and reducing temperature control costs.

[0019] In addition, burying the main liquid supply pipe and return pipe of the heat transfer unit underground can also protect the pipes and avoid damage caused by external pipes. Finally, burying the main liquid supply pipe and return pipe of the heat transfer unit underground does not take up space, which is convenient for the arrangement of various energy storage devices in the energy storage system.

[0020] 2. In the centralized temperature control system of the utility model, a thermal insulation layer is provided on the liquid supply main line to prevent the heat in the external environment from affecting the heat transfer medium in the liquid supply main line, and a heat sink is provided on the liquid return main line to dissipate as much heat of the heat transfer medium in the liquid return main line into the ground as possible, further improving the heat exchange effect between the liquid return main line and the underground environment.

[0021] 3. In the centralized temperature control system of the utility model, the liquid supply main pipe and the liquid return main pipe are buried below the frozen soil layer. This burial depth can facilitate heat exchange with the underground environment and avoid damage to the liquid supply main pipe and the liquid return main pipe in extreme environments.

[0022] 4. In the centralized temperature control system of the utility model, flow regulating devices are provided on the liquid inlet and outlet pipes, through which the flow of the heat transfer medium in each energy storage device is controlled to ensure that each energy storage device operates within a preferred temperature range. At the same time, the delivery pump of the heat treatment unit is a variable frequency pump, so that the heat treatment unit adjusts the flow of the heat transfer medium according to the temperature of the battery module in each energy storage device, further improving the energy saving effect while fully ensuring the temperature of each energy storage device.

[0023] 5. In the centralized temperature control system of the utility model, blocking joints are provided on the inlet and outlet of the heat treatment unit. When the heat treatment unit is repaired, the blocking joints can prevent the outflow of the heat transfer medium in the heat treatment unit without the need for corresponding drainage operations, thereby improving the convenience and reliability of maintenance.

[0024] 6. In the centralized temperature control system of the utility model, the heat processing unit is arranged in an empty energy storage box, which can provide safety protection for the heat processing unit and increase its service life. At the same time, this arrangement makes the entire energy storage system easy to standardize and modularize, easy to manage and maintain on site, and also aesthetically pleasing.

[0025] 7. In the energy storage system of the utility model, the heat exchange unit is a heat transfer tube, which is in direct contact with the polarity terminals of each battery module, so that the heat of the polarity terminals of the battery module is timely discharged, achieving effective heat dissipation of each single battery in the battery module and improving the safety of the battery module.

[0026] 8. In the energy storage system of the utility model, an insulating layer and an insulating sleeve are provided on the heat transfer tube, so that when the heat transfer tube and the battery module perform heat exchange, reliable insulation performance can be maintained, thereby improving the safety of the heat transfer tube and the battery module during use.

[0027] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 This is a schematic diagram of the coordination between the centralized temperature control system and the energy storage system in Example 1;

[0030] Figure 2 It is a structural schematic diagram of the energy storage device in Example 1;

[0031] Figure 3 It is a schematic diagram of the cooperation between the battery module unit and the heat transfer unit in Example 1;

[0032] Figure 4 is a schematic diagram of a heat transfer unit in Example 1;

[0033] Figure 5 is a schematic diagram of the blocking connector in Example 1;

[0034] Figure 6 is a schematic diagram of the structure of the battery module in Example 2;

[0035] Figure 7 This is a schematic diagram of the structure of the battery module in Example 2 (part of the housing is omitted);

[0036] Figure numerals: 100-energy storage device, 1-battery module, 2-heat exchange unit, 3-heat transfer unit, 4-heat processing unit, 5-energy storage box, 11-housing, 12-single battery, 13-polarity terminal, 131-clamping part, 111-electrolyte sharing chamber, 112-gas sharing chamber, 21-heat transfer pipe, 31-liquid supply main line, 32-liquid return main line, 33-liquid inlet pipe, 34-liquid outlet pipe, 35-thermal insulation layer, 36-heat sink, 37-flow regulating device, 331-primary liquid inlet pipe, 332-secondary liquid inlet pipe, 333-tertiary liquid inlet pipe, 341-primary liquid outlet pipe, 342-secondary liquid outlet pipe, 343-tertiary liquid outlet pipe, 41-blocking joint, 411-joint end pipe, 412-regulating valve, 413-welding chuck. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the utility model, but not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary persons in the field without creative work should fall within the scope of protection of the utility model.

[0038] The "other embodiments" that appear in different places in this specification do not all refer to the same embodiment, nor are they separate or selective embodiments that are mutually exclusive with other embodiments. In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of this utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically limited.

[0039] In the description of this specification, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate, or the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0040] At the same time, in the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "top, bottom, inside and outside" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0041] The utility model provides a centralized temperature control system, which is mainly used in an energy storage system. The energy storage system includes N energy storage devices, each of which includes an energy storage box and multiple battery modules arranged in the energy storage box. The multiple battery modules are connected in series, in parallel, or in series and parallel to meet the capacity requirements of the energy storage device. The above-mentioned battery module refers to a battery module formed by connecting multiple single cells in parallel or in series. A shell for protecting the battery module is provided on the outside of the battery module. In some cases, the shell can also be omitted.

[0042] The centralized temperature control system includes a heat exchange unit, a heat transfer unit and a heat treatment unit. The heat exchange unit is used to exchange heat with each battery module in the energy storage device; the heat transfer unit is used to realize the transfer of heat transfer medium between N energy storage devices and the heat treatment unit; the heat treatment unit is used to heat treat the heat transfer medium transported by the heat transfer unit; the heat transfer unit includes a liquid supply main line, a liquid return main line and N groups of liquid inlet pipes and N groups of liquid outlet pipes; the centralized temperature control system centrally processes the heat generated by the battery modules of multiple energy storage devices. Compared with the solution of setting up a temperature control system for each energy storage device separately in the existing energy storage system, multiple energy storage devices share a set of temperature control systems, which can not only reduce the production cost of the entire energy storage system, but also improve the safety of the energy storage device when in use, and facilitate its maintenance and management. Secondly, after the heat generated by the battery modules of each energy storage device is centrally processed outside the energy storage box of each energy storage device, it can facilitate the arrangement and installation of various components in the energy storage device, improve the space utilization rate inside the energy storage box, facilitate the integration of the energy storage device, and thus increase the capacity of the energy storage device.

[0043] The utility model buries the main liquid supply line and the main liquid return line of the heat transfer unit underground, so that the main liquid supply line and the main liquid return line can fully exchange heat with the underground environment, maximize the use of ambient temperature, effectively save energy, reduce temperature control energy consumption, and reduce temperature control costs. In addition, burying the main liquid supply line and the main liquid return line of the heat transfer unit underground can also protect the pipeline and avoid damage to the external pipeline. Finally, burying the main liquid supply line and the main liquid return line of the heat transfer unit underground does not take up space, which is convenient for the arrangement of various energy storage devices in the energy storage system.

[0044] Example 1

[0045] like Figures 1 to 4 As shown, the centralized temperature control system provided in this embodiment is applied in an energy storage system, and the energy storage system includes multiple energy storage devices. The centralized temperature control system includes a heat exchange unit 2, a heat transfer unit 3 and a heat treatment unit 4; the heat exchange unit 2 is used to perform heat exchange with each battery module 1 in the energy storage device 100; the heat transfer unit 3 is respectively connected to N energy storage devices 100 and the heat treatment unit 4, and is used to realize the transmission of heat transfer medium between N energy storage devices 100 and the heat treatment unit 4; the heat treatment unit 4 is used to perform heat treatment on the heat transfer medium transported by the heat transfer unit 3.

[0046] The heat exchange unit 2 is mainly used for heat exchange with each battery module 1 in the energy storage device 100. The heat exchange unit 2 can be a heat transfer plate or heat transfer tube in contact with the shell of the single battery in the battery module 1, or in contact with the polarity terminal 13 of each battery module 1, or in contact with the shell of the battery module 1. The heat transfer plate or heat transfer tube has an inlet and an outlet, which is connected to the heat transfer unit 3 to control the temperature of the battery module 1.

[0047] like Figure 3 and Figure 6 As shown, the heat exchange unit 2 in this embodiment is a heat transfer tube 21, and a heat transfer medium is contained in the heat transfer tube 21, which is used to exchange heat with the polarity terminals 13 of each battery module 1 in the energy storage device 100. After the heat transfer tube 21 exchanges heat with the battery module 1, the heat transfer medium is transported to the heat treatment unit 4 through the heat transport unit 3 for treatment.

[0048] like Figure 1 As shown, the heat transfer unit 3 in this embodiment includes a liquid supply main line 31, a liquid return main line 32, N groups of liquid inlet lines 33, and N groups of liquid outlet lines 34; the liquid supply main line 31 is connected to the heat treatment unit 4 and the N groups of liquid inlet lines 33, respectively, for shunting the heat transfer medium in the heat treatment unit 4 to the N energy storage devices 100; each group of liquid inlet lines 33 is connected to each heat exchange unit 2 in a single energy storage box 5, respectively, for shunting the heat transfer medium in the liquid supply main line 31 to the heat exchange unit 2 of each battery module 1; each group of liquid outlet lines 34 is connected to each heat exchange unit 2 in a single energy storage box 5, respectively, for converging the heat transfer medium after heat exchange with each battery module 1 to the liquid return main line 32, and the liquid return main line 32 is connected to the heat treatment unit 4 and the N groups of liquid outlet lines 34, respectively, for converging the heat transfer medium in the N energy storage devices 100 to the heat treatment unit 4.

[0049] In this embodiment, the liquid supply main line 31 and the liquid return main line 32 of the heat transfer unit 3 are buried underground. Compared with the temperature above ground, the underground temperature is relatively low, so that the liquid return main line 32 can fully exchange heat with the underground environment, and the heat of the heat transfer medium in the liquid return main line can be dissipated into the ground as much as possible, so as to maximize the use of the underground environment temperature, effectively save energy, reduce temperature control energy consumption, and reduce temperature control costs.

[0050] like Figure 1 As shown, in order to further improve the energy-saving effect, in this embodiment, a heat-insulating layer 35 is provided on the above-mentioned liquid supply main line 31 to prevent the underground environment from affecting the temperature of the heat transfer medium in the liquid supply main line 31. At the same time, a heat sink 36 is provided on the liquid return main line 32. The heat sink 36 increases the heat exchange area between the liquid return main line 32 and the underground environment, so that the heat of the heat transfer medium in the liquid return main line is dissipated into the ground as much as possible, further improving the heat exchange effect between the liquid return main line and the underground environment.

[0051] In addition, the optimal burial depth of the liquid supply main line 31 and the liquid return main line 32 is below the frozen soil layer, which can facilitate heat exchange with the underground environment and avoid damage to the liquid supply main line 31 and the liquid return main line 32 in extreme environments.

[0052] like Figure 1 As shown, a flow regulating device 37 may be provided on the above-mentioned liquid inlet pipeline 33 and liquid outlet pipeline 34. The flow regulating device 37 may specifically be a flow regulating valve, etc. The flow regulating device 37 regulates the flow of the heat transfer medium according to the temperature of the battery module 1 in each energy storage device 100, so that the temperature of the battery module 1 in each energy storage device 100 is within a preferred range.

[0053] The above-mentioned liquid inlet pipeline 33 and liquid outlet pipeline 34 are installed and manufactured according to the number and arrangement of battery modules 1. For example, multiple battery modules 1 are arranged in sequence in the horizontal direction to form a battery module unit, and then multiple battery module units are arranged in sequence in the vertical direction to form a battery cluster. At this time, the liquid inlet pipeline 33 and liquid outlet pipeline 34 can be manufactured in the following manner:

[0054] First, the liquid inlet pipeline 33, the liquid outlet pipeline 34 and the heat transfer pipe 21 are made of an integrated pipeline, that is, the entire energy storage device 100 includes only one pipeline for the flow of heat transfer medium, and the pipeline can be specifically made of an aluminum tube, one end of which passes through the energy storage box 5 of the energy storage device 100 to connect with the liquid supply main pipeline 31, and the other end passes through the energy storage box 5 of the energy storage device 100 to connect with the liquid return main pipeline 32, and the part inside the energy storage box 5 is bent up and down and left and right for many times, and is connected with the polarity terminals 13 on multiple battery modules 1 in turn. This installation method requires many bends on the aluminum tube, and has high requirements on the quality of the pipeline. At the same time, during installation, the entire pipeline needs to be connected with the polarity terminal 13 of each battery module 1 in turn, and the reliability and convenience of installation are relatively poor, and installation errors are prone to occur after installation.

[0055] Second, the liquid inlet pipeline 33, the liquid outlet pipeline 34 and the heat transfer tube 21 are manufactured and installed separately, and the liquid inlet pipeline 33 and the liquid outlet pipeline 34 are manufactured through multi-stage pipelines. Figure 3 and Figure 4 As shown, the liquid inlet pipeline 33 specifically includes a primary liquid inlet pipe 331, a secondary liquid inlet pipe 332 and a tertiary liquid inlet pipe 333; the inlet of the primary liquid inlet pipe 331 is used to connect with the liquid supply main pipeline 31; multiple secondary liquid inlet pipes 332 are connected to the primary liquid inlet pipe 331, and each secondary liquid inlet pipe 332 provides heat transfer medium to each battery module unit, that is, multiple secondary liquid inlet pipes 332 divide the heat transfer medium in the primary liquid inlet pipe 331 to multiple battery module units; multiple tertiary liquid inlet pipes 333 are connected to the secondary liquid inlet pipe 332, and at the same time, each tertiary liquid inlet pipe 333 is respectively connected to the inlet of the heat transfer pipe 21 of each battery module 1, and each tertiary liquid inlet pipe 333 provides heat transfer medium to each battery module 1 That is to say, multiple tertiary liquid inlet pipes 333 divert the heat transfer medium in the secondary liquid inlet pipe 332 to multiple battery modules 1; the above-mentioned liquid outlet pipeline 34 includes a primary liquid outlet pipe 341, a secondary liquid outlet pipe 342 and a tertiary liquid outlet pipe 343; each tertiary liquid outlet pipe 343 is respectively connected to the outlet of the heat transfer pipe 21 of each battery module 1, and at the same time, multiple tertiary liquid outlet pipes 343 are all connected to the secondary liquid outlet pipe 342 to gather the heat transfer medium of multiple battery modules 1 after heat exchange into the secondary liquid outlet pipe 342, and each secondary liquid outlet pipe 342 is connected to the primary liquid outlet pipe 341 to gather the heat transfer medium of multiple battery module units after heat exchange into the primary liquid outlet pipe 341, and the primary liquid outlet pipe 341 is connected to the return liquid main pipeline 32.

[0056] The liquid inlet pipeline 33 and the liquid outlet pipeline 34 are made of multi-stage pipelines, so that the heat transfer medium flowing out of the liquid supply main pipeline 31 is divided step by step and evenly distributed to each battery module 1, and the heat transfer medium flow allocated to each battery module 1 is balanced, so that each battery module 1 in the battery cluster has a good and balanced heat dissipation effect, thereby improving the working stability and service life of the energy storage device 100.

[0057] In addition, if Figure 4 As shown, the first-level liquid inlet pipe 331, the second-level liquid inlet pipe 332, the first-level liquid outlet pipe 341, and the second-level liquid outlet pipe 342 can all be formed by splicing multiple sections of pipelines. At the same time, the third-level liquid inlet pipe 333 and the third-level liquid outlet pipe 343 are also detachably connected, making the installation, disassembly and maintenance of the entire liquid inlet pipeline 33 and the liquid outlet pipeline 34 very convenient. During subsequent maintenance, it is only necessary to remove the pipeline connector of the relevant battery module 1 without removing the entire pipeline assembly, which is convenient for disassembly and maintenance.

[0058] The heat transfer unit 3 transfers the heat generated by the battery modules 1 in the multiple energy storage devices 100 to the heat treatment unit 4 for treatment, which is specifically a heating treatment or a cooling treatment. Therefore, the heat treatment unit 4 is a device with heating and / or cooling functions, which is used to increase or decrease the temperature of the heat transfer medium (specifically, water, ethylene glycol / water, propylene glycol / water, methanol / water, ethanol / water, calcium formate / water, etc.) transported by the heat transfer unit 3. For example, the heat transfer unit 3 is specifically a heater, a cold and warm machine, or a refrigerator with a compressor, a chiller, etc. At the same time, the delivery pump of the heat treatment unit can also be selected as a variable frequency pump, so that the heat treatment unit adjusts the flow of the heat transfer medium according to the temperature of the battery module in each energy storage device, and further improves the energy saving effect while fully ensuring the temperature of each energy storage device.

[0059] like Figure 1 As shown, the inlet and outlet of the heat treatment unit 4 are respectively connected to the liquid supply main line 31 and the liquid return main line 32. At this time, in order to facilitate maintenance, the inlet and outlet of the heat treatment unit 4 are provided with blocking joints 41, and the blocking joints 41 can block the heat transfer medium in the heat treatment unit 4 when the heat treatment unit 4 is installed and disassembled.

[0060] like Figure 5As shown, the blocking joint 41 includes a joint end pipe 411, a regulating valve 412 and two welding chucks 413; one end of the regulating valve 412 is connected to the joint end pipe 411 through the welding chuck 413, and the joint end pipe 411 is used to connect to the inlet and outlet of the heat treatment unit 4, and the other end is connected to the liquid supply main line 31 and the liquid return main line 32 through the welding chuck 413. The regulating valve 412 can be specifically a butterfly valve. When the heat treatment unit 4 works normally, the regulating valve 412 is in a normally open state, and the liquid supply main line 31, the liquid return main line 32 and the heat transfer medium in the heat treatment unit 4 are in a normal flow state. When the heat treatment unit 4 needs to be disassembled and repaired, the regulating valve 412 is closed, and the blocking joint 41 blocks the inflow and outflow of the heat transfer medium in the heat treatment unit 4. At this time, the liquid supply main line 31, the liquid return main line 32 and the heat transfer medium in the heat treatment unit 4 are in a disconnected state. Subsequently, the heat treatment unit 4 and the liquid supply main line 31 and the liquid return main line 32 can be directly disassembled without performing corresponding drainage operations, thereby improving the convenience and reliability during maintenance.

[0061] In addition, the above-mentioned heat treatment unit 4 can also be set in an empty energy storage box 5. The energy storage box 5 can provide safety protection for the heat treatment unit 4 and increase its service life. At the same time, this setting makes the entire energy storage system easy to standardize and modularize, easy to manage and maintain on site, and also aesthetically pleasing.

[0062] Example 2

[0063] like Figure 1 As shown, this embodiment provides an energy storage system, which includes multiple energy storage devices 100 and the centralized temperature control system in the above-mentioned embodiment 1. In the energy storage system, the heat treatment unit 4 and the multiple energy storage devices 100 are arranged according to the site environment. The multiple energy storage devices 100 can be linearly arranged in one or two rows, and the heat treatment unit 4 is set at the end; or, the multiple energy storage devices 100 are arranged radially, and the heat treatment unit 4 is set at the center.

[0064] like Figure 2 As shown, each energy storage device 100 includes an energy storage box 5 and a plurality of battery modules 1 arranged in the energy storage box 5. The number of battery modules 1 is set according to the needs of the energy storage device 100, and the plurality of battery modules 1 are connected in series and parallel to meet the different capacity requirements of the energy storage device 100. When the battery modules 1 are arranged in the energy storage box 5, the plurality of battery modules 1 are arranged in sequence in the horizontal direction to form a battery module unit. Subsequently, the plurality of battery module units are arranged in sequence in the vertical direction to form a battery cluster. The centralized temperature control system is mainly used to control the temperature of the battery modules 1 in each energy storage device 100 during normal operation, so that each battery module 1 operates within a suitable temperature range and thermal runaway of the battery module 1 is avoided as much as possible.

[0065] like Figure 6 and Figure 7 As shown, the battery module 1 in this embodiment includes a housing 11 and a plurality of single cells 12, and the plurality of single cells 12 are arranged in the same direction and placed in the housing 11. The single cells 12 in this embodiment are square shell batteries, and the number can be adjusted according to actual needs. The inner cavity of each single cell 12 includes an electrolyte area and a gas area. After multiple single cells 12 are arranged in the same direction and placed in the shell 11, avoidance holes are opened on the top plate of the shell 11 corresponding to the polarity terminals 13 of each single cell 12, and the polarity terminals 13 of each single cell 12 extend out of the corresponding avoidance holes as the polarity terminals 13 of the battery module 1 (the polarity terminals 13 of all single cells 12 on one side serve as the positive polarity terminals 13 of the battery module 1, and the polarity terminals 13 of all single cells 12 on the other side serve as the negative polarity terminals 13 of the battery module 1), and the top plate area of ​​the shell 11 corresponding to the avoidance hole is fixedly sealed with the shell of the single cell 12, so that the gap between the polarity terminal 13 and the avoidance hole is sealed, and the above-mentioned polarity terminal 13 passes through the avoidance hole and is electrically connected through the electrical connector.

[0066] It should be noted that the polarity terminal 13 of the single cell 12 here can be the pole of the single cell 12. In order to avoid the pole of the single cell 12 from being unable to smoothly extend out of the avoidance hole as the polarity terminal 13, a pole adapter can also be connected to the pole of the single cell 12, and the overall structure of the pole of the single cell 12 and the pole adapter can be used as the polarity terminal 13 of the single cell 12.

[0067] The housing 11 is provided with a shared chamber, and the inner cavity of the shared chamber is connected to the inner cavities of all the single batteries 12 .

[0068] The above-mentioned shared chamber may be an electrolyte shared chamber 111, the inner cavity of the electrolyte shared chamber 111 is connected to the electrolyte area of ​​the inner cavity of all the single cells 12, and the electrolyte shared chamber 111 can make each single cell 12 in a unified electrolyte environment, thereby ensuring the uniformity of the electrolyte in each single cell 12 and improving the performance and charge-discharge cycle life of the battery module 1. In this embodiment, the electrolyte shared chamber 111 is a liquid channel arranged between the bottom plate of the housing 11 and the bottom of each single cell 12.

[0069] The above-mentioned shared chamber can also be a gas shared chamber 112. The inner cavity of the gas shared chamber 112 is connected to the gas area of ​​the inner cavity of all the single cells 12. The gas balance of each single cell 12 is achieved through the gas shared chamber 112, which can also improve the performance and charge-discharge cycle life of the battery module 1. In this embodiment, the gas shared chamber 112 is a gas channel arranged on the top plate of the shell 11. At this time, the top plate of the shell 11 is provided with a protrusion extending along the arrangement direction of the single cells 12, and a gas channel is formed at the protrusion.

[0070] The above-mentioned shared chamber can also be a gas-liquid shared chamber, and the inner cavity of the gas-liquid shared chamber is connected to the electrolyte area and gas area of ​​the inner cavity of all single cells 12. Through a gas-liquid shared chamber, each single cell 12 can be placed in a unified electrolyte environment and gas environment, thereby improving the performance and charge-discharge cycle life of the battery module 1.

[0071] In the above-mentioned battery module 1, a clamping portion 131 is provided at the position where the polarity terminal 13 of each single battery 12 extends out of the avoidance hole. The clamping portion is a through groove or through hole opened at the position where the polarity terminal of each single battery extends out of the avoidance hole. The heat exchange unit 2 is a heat transfer tube 21, which is fixed in the through groove or through hole of the polarity terminal 13 of each single battery 12, and the heat transfer tube 21 is insulated from each single battery 12. The heat transfer tube 21 is connected to the heat treatment unit 4 through the heat transfer unit 3, and the heat generated by each battery module 1 in the energy storage device 100 is centrally processed outside the energy storage box 5, so that the battery modules 1 in each energy storage box 5 work within a more suitable temperature range.

[0072] The heat transfer tube 21 can be a metal tube, which has excellent thermal conductivity to ensure the heat exchange effect between the heat transfer tube 21 and the battery module 1. At the same time, the metal tube has at least one of an insulating layer and an insulating sleeve to ensure the insulation between the metal tube and the battery module 1 when in use. The above-mentioned insulating layer can specifically be a ceramic coating, an insulating paint, a hard oxide layer, etc., and the insulating sleeve specifically adopts a thermally conductive plastic sleeve or a thermally conductive rubber sleeve with good insulation and thermal conductivity. Optimally, an insulating layer and an insulating sleeve are provided on the heat transfer tube 21 at the same time to form a double insulation structure; this double insulation setting enables the heat transfer tube 21 to maintain reliable insulation performance with the battery module 1 when the heat transfer tube 21 is in heat exchange with the battery module 1, even if one of the insulating layer or the insulating sleeve is damaged, thereby improving the safety of the battery module 1 during use.

[0073] The heat transfer tube 21 is installed on the polarity terminal 13 of the battery module 1, and is mainly used to control the temperature of the top of the battery module 1, especially the polarity terminal 13 of the battery module 1, to ensure that the battery module 1 operates within the optimal temperature range. The heat transfer tube 21 is directly connected to the polarity terminal 13 of the battery module 1, and the heat on the polarity terminal 13 where the heat is more concentrated is promptly discharged to improve the heat dissipation effect of the top of the battery module 1. In addition, when the temperature of the battery module 1 is lower than the set threshold, the battery module 1 is heated by passing a higher temperature heat transfer medium into the heat transfer tube 21; by controlling the temperature of the heat transfer medium, it can be ensured that the battery module 1 always operates at a normal operating temperature.

[0074] In the energy storage system of this embodiment, each battery module 1 in the energy storage device 100 is connected to the heat exchange unit 2 respectively, and the battery module 1 exchanges heat with the heat transfer medium in the heat exchange unit 2. Subsequently, the heat transport unit 3 transports the heat transfer medium in the multiple energy storage devices 100 to the heat treatment unit 4, and the heat treatment unit 4 centrally performs heat treatment on the heat transfer medium, so that the multiple energy storage devices 100 share a centralized temperature control system. Compared with the temperature control system provided for each energy storage device 100, the multiple energy storage devices 100 share a set of temperature control system, which not only greatly reduces the production cost of the entire energy storage system, but also facilitates the maintenance and management of the entire energy storage system.

Claims

1. A centralized temperature control system, characterized in that: It includes a heat exchange unit, a heat transfer unit and a heat processing unit; The heat exchange unit is used to exchange heat with each battery module in the energy storage device; the heat transport unit is used to realize the transport of heat transfer medium between N energy storage devices and the heat treatment unit; the heat treatment unit is used to perform heat treatment on the heat transfer medium transported by the heat transport unit; The heat transfer unit includes a liquid supply main line, a liquid return main line, N groups of liquid inlet pipelines, and N groups of liquid outlet pipelines; The main liquid supply pipeline is connected to the heat treatment unit and N groups of liquid inlet pipelines respectively, and is used to divert the heat transfer medium in the heat treatment unit to N energy storage devices; Each group of liquid inlet pipelines is respectively connected to the heat exchange unit of a single energy storage device, and is used to divert the heat transfer medium in the liquid supply main pipeline to the heat exchange unit of each battery module; Each group of liquid outlet pipelines is respectively connected to the heat exchange unit of a single energy storage device, and is used to converge the heat transfer medium after heat exchange with each battery module to the liquid return main pipeline; the liquid return main pipeline is respectively connected to the heat treatment unit and N groups of liquid outlet pipelines, and is used to converge the heat transfer medium in the N energy storage devices to the heat treatment unit; The liquid supply main line and the liquid return main line are both buried underground.

2. The centralized temperature control system according to claim 1, characterized in that: The liquid supply main line is provided with a heat preservation and insulation layer, and the liquid return main line is provided with a heat sink.

3. The centralized temperature control system according to claim 2, characterized in that: The buried depth of the liquid supply main pipeline and the liquid return main pipeline is below the frozen soil layer.

4. The centralized temperature control system according to claim 1, characterized in that: The liquid inlet pipeline and the liquid outlet pipeline are provided with flow regulating devices, and the delivery pump of the heat treatment unit is a variable frequency pump.

5. The centralized temperature control system according to any one of claims 1 to 4, characterized in that: The inlet and outlet of the heat treatment unit are provided with blocking joints, and the blocking joints can block the heat transfer medium in the heat treatment unit.

6. The centralized temperature control system according to claim 5, characterized in that: The heat processing unit is arranged in an empty energy storage box.

7. An energy storage system, characterized in that: It comprises a plurality of energy storage devices and a centralized temperature control system as claimed in any one of claims 1 to 6, wherein the energy storage devices comprise an energy storage box and a plurality of battery modules arranged in the energy storage box, and each battery module is connected to a heat exchange unit for heat exchange.

8. The energy storage system according to claim 7, characterized in that: The battery module includes a shell and multiple single cells; the multiple single cells are arranged in the shell in the same direction; the shell is provided with a shared chamber, the inner cavity of the shared chamber is connected with the inner cavities of all the single cells; avoidance holes are opened on the top plate of the shell corresponding to the polarity terminals of each single cell; the polarity terminals of each single cell extend out of the avoidance holes, and the top plate area of ​​the shell corresponding to the avoidance holes is fixedly sealed with the shell of the single cell.

9. The energy storage system according to claim 8, characterized in that: The heat exchange unit includes at least one heat transfer tube. A clamping portion is provided on the polarity terminal of the battery module. Each heat transfer tube is fixed on the clamping portion of each battery module in a one-to-one correspondence, and the heat transfer tube is insulated from each battery module. The clamping portion is a through groove or through hole provided at the position where the polarity terminal of each single battery extends out of the avoidance hole.

10. The energy storage system according to claim 9, characterized in that: The heat transfer tube is a metal tube, and the metal tube has at least one of an insulating layer and an insulating sleeve.

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