Liquid cooling system and energy storage product

Abstract

The utility model belongs to the technical field of energy storage products, and discloses a liquid cooling system and an energy storage product. The liquid cooling system comprises a first-stage pipeline, a second-stage pipeline and a third-stage pipeline. The first-stage pipeline comprises a liquid inlet pipeline and a liquid outlet pipeline, and the inlet end of the liquid inlet pipeline is configured to be communicated with the liquid cooling unit; the second-stage pipeline comprises a second-stage liquid inlet pipe and a second-stage liquid outlet pipe, the inlet end of the second-stage liquid inlet pipe is communicated with the outlet end of the liquid inlet pipeline, and the outlet end of the second-stage liquid outlet pipe is communicated with the inlet end of the liquid outlet pipeline; the third-stage pipelines are arranged in one-to-one correspondence with the battery pack assemblies and comprise head end pipelines, connecting pipelines and tail end pipelines, the inlet ends of the head end pipelines are communicated with the second-stage pipelines, one connecting pipeline is arranged between any two adjacent battery packs, and the outlet ends of the tail end pipelines are communicated with the second-stage liquid outlet pipes; and first flow control valves are arranged on the head end pipeline and the tail end pipeline. According to the utility model, the temperature uniformity of an energy storage product is better.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage products, in particular to a liquid cooling system and an energy storage product. Background Art

[0002] Generally, energy storage products are used to store the electric energy generated by photovoltaic panels. When the photovoltaic panels are working, sunlight shines on the photovoltaic panels, exciting electrons in the photovoltaic cells and generating direct current electric energy. The direct current electric energy is converted into alternating current by an inverter and transmitted to the energy storage product, and the battery pack in the energy storage product stores the electric energy for subsequent use. The battery components in the energy storage product include a plurality of battery packs arranged closely in an array. The battery packs will generate heat during the working process. In order to prevent the battery packs from overheating and malfunctioning, the energy storage product generally also includes a liquid cooling system to dissipate heat from the battery packs.

[0003] In the prior art, the liquid cooling pipes of the liquid cooling system sequentially pass through a plurality of battery packs to dissipate heat from the battery packs.

[0004] However, since the energy storage product is generally outdoors, as time changes, the sun-facing side of the energy storage product will also change. At the same time, due to the different positions of different battery packs, there are differences in the temperatures of different battery packs. The liquid cooling pipes in the prior art can only adjust the overall inlet and outlet liquid flow rates, resulting in poor temperature uniformity of the energy storage product. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a liquid cooling system and an energy storage product, which can make the temperature uniformity of the energy storage product better.

[0006] To achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A liquid cooling system for dissipating heat from the battery packs of an energy storage product. The energy storage product includes a plurality of battery pack assemblies stacked in sequence in the vertical direction, and each battery pack assembly includes a plurality of the battery packs arranged in sequence in the horizontal direction. The liquid cooling system includes:

[0008] A primary pipeline, including an inlet pipeline and an outlet pipeline, and the inlet end of the inlet pipeline is configured to be connected to a liquid cooling unit;

[0009] A secondary pipeline, including a secondary inlet pipe and a secondary outlet pipe. The inlet end of the secondary inlet pipe is connected to the outlet end of the inlet pipeline, and the outlet end of the secondary outlet pipe is connected to the inlet end of the outlet pipeline;

[0010] The three - level pipeline is provided in one - to - one correspondence with the battery pack assembly, and includes a first - end pipeline, a connecting pipeline, and a last - end pipeline. The inlet end of the first - end pipeline is communicated with the second - level pipeline, and the outlet end of the first - end pipeline is connected to the first - end battery pack in the battery pack assembly. A connecting pipeline is provided between any two adjacent battery packs. The inlet end of the last - end pipeline is connected to the last - end battery pack in the battery pack assembly, and the outlet end of the last - end pipeline is communicated with the second - level liquid outlet pipe. First flow control valves are provided on both the first - end pipeline and the last - end pipeline.

[0011] Optionally, the connecting pipeline includes:

[0012] A first pipeline, the inlet end of which is connected to one of two adjacent battery packs;

[0013] A second pipeline, the outlet end of which is connected to the other of two adjacent battery packs;

[0014] A three - way valve, which includes a first port, a second port, and a drain port. The first port is communicated with the outlet end of the first pipeline, the second port is communicated with the inlet end of the second pipeline, and any one of the first port, the second port, and the drain port can be selectively closed so that the other two are communicated.

[0015] Optionally, a drain pipe connection joint is provided at the drain port.

[0016] Optionally, a temperature measuring element is provided on the first pipeline.

[0017] Optionally, a temperature - measuring element installation pipe is sleeved on the first pipeline. A temperature - measuring element installation position is provided on the temperature - measuring element installation pipe, and the temperature - measuring element is installed at the temperature - measuring element installation position.

[0018] Optionally, the temperature - measuring element installation pipe includes:

[0019] A main pipe body, which is sleeved on the outer side of the first pipeline;

[0020] A branch pipe body, in which an installation cavity communicated with the main pipe body is provided, and the installation cavity is the temperature - measuring element installation position.

[0021] Optionally, the three - way valve is a T - type three - way ball valve.

[0022] Optionally, the second - level pipeline further includes a horizontal connecting pipe, and the inlet ends of the inlet pipeline and the second - level inlet pipe are communicated through the horizontal connecting pipe.

[0023] Optionally, second flow control valves are provided on both the inlet pipeline and the outlet pipeline.

[0024] Energy storage products, including a plurality of battery pack components stacked in sequence along the vertical direction, each of the battery pack components including a plurality of the battery packs arranged in sequence along the horizontal direction, and the energy storage products further including the above-mentioned liquid cooling system.

[0025] Advantages of the present utility model:

[0026] When the liquid cooling system provided by the present utility model is working, the coolant output by the liquid cooling unit flows through the liquid inlet pipeline to the secondary liquid inlet pipe, and the coolant in the secondary liquid inlet pipe enters the first battery pack in the battery pack component through the first pipeline, and successively passes through the remaining battery packs in the battery pack component through the connecting pipeline. Finally, after the coolant flows out of the last battery pack, it flows through the end pipeline to the secondary liquid outlet pipe, and the coolant in the secondary liquid outlet pipe finally flows to the liquid outlet pipeline.

[0027] Since the first flow control valves are provided on both the first pipeline and the end pipeline, by controlling the opening degrees of the first flow control valves on the first pipeline and the end pipeline, the flow rate of the coolant flowing through each battery pack component can be controlled, so that the cooling efficiency of the battery pack components at different heights can be controlled, ensuring good temperature uniformity of the battery pack components at different heights, and further ensuring good temperature uniformity of the energy storage products. Description of the drawings

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description in the embodiments of the present utility model. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the content of the embodiments of the present utility model and these drawings.

[0029] Figure 1 It is a schematic structural diagram of an energy storage product provided by an embodiment of the present utility model from one perspective;

[0030] Figure 2 is Figure 1 an enlarged view of part A in

[0031] Figure 3 is Figure 1 an enlarged view of part B in

[0032] Figure 4 It is a schematic structural diagram of the temperature measuring element installation pipe provided by an embodiment of the present utility model;

[0033] Figure 5 It is a schematic structural diagram of an energy storage product provided by an embodiment of the present utility model from another perspective;

[0034] Figure 6 is Figure 5 The enlarged view of position C in it.

[0035] In the figure:

[0036] 10. Battery pack assembly; 100. Battery pack;

[0037] 1. Primary pipeline; 11. Liquid inlet pipeline; 12. Liquid outlet pipeline;

[0038] 2. Secondary pipeline; 21. Secondary liquid inlet pipe; 22. Secondary liquid outlet pipe; 23. Horizontal connecting pipe;

[0039] 3. Tertiary pipeline; 31. First-end pipeline; 32. Connecting pipeline; 321. First pipeline; 3211. Temperature measuring element; 3212. Temperature measuring element installation pipe; 32121. Main pipe body; 32122. Branch pipe body; 322. Three-way valve; 323. Second pipeline; 33. Last-end pipeline;

[0040] 4. First flow control valve;

[0041] 5. Second flow control valve. Specific embodiments

[0042] The following further elaborates on the present utility model in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are merely used to explain the present utility model and not to limit the present utility model. Additionally, it should be noted that for the sake of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0043] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0044] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.

[0045] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "left" and "right" are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, 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 thus cannot be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0046] See Figures 1-6 , this embodiment provides an energy storage product, and this energy storage product can store the electric energy generated by a photovoltaic panel.

[0047] Specifically, the energy storage product includes a plurality of battery pack assemblies 10 stacked in sequence along the vertical direction, and each battery pack assembly 10 includes a plurality of battery packs 100 arranged in sequence along the horizontal direction.

[0048] In order to dissipate heat from the energy storage product and prevent the heat generated by the battery packs 100 during operation from not being dissipated in time, in this embodiment, the energy storage product further includes a liquid cooling system.

[0049] Specifically, see Figures 1-3 and Figure 6 , in this embodiment, the liquid cooling system includes a first-stage pipeline 1, a second-stage pipeline 2 and a third-stage pipeline 3.

[0050] Among them, the first-stage pipeline 1 includes a liquid inlet pipeline 11 and a liquid outlet pipeline 12, and the inlet end of the liquid inlet pipeline 11 is configured to be communicated with a liquid cooling unit.

[0051] The second-stage pipeline 2 includes a second-stage liquid inlet pipe 21 and a second-stage liquid outlet pipe 22. The inlet end of the second-stage liquid inlet pipe 21 is communicated with the outlet end of the liquid inlet pipeline 11, and the outlet end of the second-stage liquid outlet pipe 22 is communicated with the inlet end of the liquid outlet pipeline 12.

[0052] The three - level pipeline 3 is set in one - to - one correspondence with the battery pack assembly 10, including a first - end pipeline 31, a connecting pipeline 32, and a last - end pipeline 33. The inlet end of the first - end pipeline 31 is connected to the second - level pipeline 2, the outlet end of the first - end pipeline 31 is connected to the first - end battery pack 100 in the battery pack assembly 10. A connecting pipeline 32 is provided between any two adjacent battery packs 100. The inlet end of the last - end pipeline 33 is connected to the last - end battery pack 100 in the battery pack assembly 10, and the outlet end of the last - end pipeline 33 is connected to the second - level liquid outlet pipe 22. First - flow control valves 4 are provided on both the first - end pipeline 31 and the last - end pipeline 33.

[0053] When the liquid - cooling system provided in this embodiment is working, the coolant output by the liquid - cooling unit flows through the inlet pipeline 11 to the second - level inlet pipe 21. The coolant in the second - level inlet pipe 21 enters the first - end battery pack 100 in the battery pack assembly 10 through the first - end pipeline 31, and then sequentially passes through the remaining battery packs 100 in the battery pack assembly 10 through the connecting pipeline 32. Finally, after the coolant flows out from the last - end battery pack 100, it flows through the last - end pipeline 33 to the second - level liquid outlet pipe 22, and the coolant in the second - level liquid outlet pipe 22 finally flows to the outlet pipeline 12.

[0054] The coolant output from the outlet pipeline 12 flows back to the liquid - cooling unit again, and the liquid - cooling unit cools the returned coolant again.

[0055] Specifically, the coolant will flow into the liquid - cooling plate of the battery pack 100.

[0056] Since first - flow control valves 4 are provided on both the first - end pipeline 31 and the last - end pipeline 33, by controlling the opening degrees of the first - flow control valve 4 on the first - end pipeline 31 and the first - flow control valve 4 on the last - end pipeline 33, the flow rate of the coolant flowing through each battery pack assembly 10 can be controlled, so that the cooling efficiency of the battery pack assemblies 10 at different heights can be controlled, ensuring good temperature uniformity of the battery pack assemblies 10 at different heights, and further ensuring good temperature uniformity of the energy - storage product.

[0057] Furthermore, in this embodiment, second - flow control valves 5 are provided on both the inlet pipeline 11 and the outlet pipeline 12. In this way, the flow rate of the coolant in the liquid - cooling system can be further controlled.

[0058] Specifically, referring to Figure 3 , in this embodiment, the connecting pipeline 32 includes a first pipeline 321, a three - way valve 322, and a second pipeline 323.

[0059] Among them, the inlet end of the first pipeline 321 is connected to one of two adjacent battery packs 100.

[0060] The outlet end of the second pipeline 323 is connected to the other one of two adjacent battery packs 100.

[0061] The three-way valve 322 includes a first port, a second port and a drain port. The first port is communicated with the outlet end of the first pipeline 321, the second port is communicated with the inlet end of the second pipeline 323, and any one of the first port, the second port and the drain port can be selectively closed so that the other two are communicated.

[0062] With the above-mentioned connecting pipeline 32, when normally dissipating heat from the energy storage product, control the drain port to be closed and the first port to be communicated with the second port, then the normal flow of the coolant in the liquid cooling system can be ensured.

[0063] When an abnormality occurs in a certain battery pack 100, it is necessary to drain the coolant in the liquid cooling plate of the battery pack 100. At this time, according to the position of the specific battery pack 100, control one of the first port and the second port to be closed so that the other one is communicated with the drain port, then the coolant in the liquid cooling plate of the abnormal battery pack 100 can be drained. In this way, it is not necessary to drain all the coolant in the liquid cooling system, reducing the maintenance cost.

[0064] Specifically, the method of controlling one of the first port and the second port to be closed according to the position of the specific battery pack 100 is as follows: when the battery pack 100 directly connected to the first port fails, control the first port to be closed; when the battery pack 100 directly connected to the second port fails, control the second port to be closed.

[0065] Optionally, in this embodiment, the three-way valve 322 is a T-shaped three-way ball valve. The T-shaped three-way ball valve can communicate the three channels with each other, and can also close any one of the channels and communicate the other two channels, which can meet the usage requirements.

[0066] Furthermore, a drain pipe connection joint is provided at the drain port. When draining is required, at the drain port where draining is needed, the connection of the drain pipe at this drain port is realized through the drain pipe connection joint.

[0067] Furthermore, in order to more accurately understand the cooling effect of the battery pack assembly 10, a temperature measuring element 3211 is provided on the first pipeline 321. Through the temperature measuring element 3211, the temperature of the coolant flowing through the first pipeline 321 can be obtained, and then the cooling effect of the battery pack assembly 10 can be obtained.

[0068] See Figure 3 and Figure 4 , in this embodiment, a temperature measuring element installation pipe 3212 is sleeved on the first pipeline 321, a temperature measuring element installation position is provided on the temperature measuring element installation pipe 3212, and the temperature measuring element 3211 is installed at the temperature measuring element installation position.

[0069] Furthermore, seeFigure 4 The temperature measuring element installation pipe 3212 includes a main pipe body 32121 and a branch pipe body 32122.

[0070] The main pipe body 32121 is sleeved on the outer side surface of the first pipeline 321.

[0071] An installation cavity communicating with the main pipe body 32121 is arranged inside the branch pipe body 32122, and the installation cavity is a temperature measuring element installation position.

[0072] Further, internal threads are arranged in the installation cavity, and the temperature measuring element 3211 is threadedly installed in the installation cavity to ensure the stability of the installation of the temperature measuring element 3211.

[0073] Specifically, in this embodiment, the temperature measuring element 3211 is a temperature sensor. The contact of the temperature sensor contacts the outer side surface of the first pipeline 321, so as to obtain the temperature of the coolant in the first pipeline 321.

[0074] Further, in this embodiment, since the secondary liquid inlet pipe 21 and the secondary liquid outlet pipe 22 are respectively located on both sides of the energy storage product, and the primary pipeline 1 is located on one side, specifically, the primary pipeline 1 is arranged close to the secondary liquid outlet pipe 22. Therefore, in this embodiment, the secondary pipeline 2 further includes a horizontal connecting pipe 23, and the inlet ends of the liquid inlet pipeline 11 and the secondary liquid inlet pipe 21 are communicated through the horizontal connecting pipe 23. The horizontal connecting pipe 23 is arranged close to the upper side of the energy storage product.

[0075] Further, in order to better control the operation of the liquid cooling system, in this embodiment, the liquid cooling system further includes a controller, and the controller is communicatively connected to the first flow control valve 4, the second flow control valve 5 and the temperature measuring element 3211.

[0076] During the actual operation of the liquid cooling system, the controller collects the temperature measurement data of all the temperature measuring elements 3211 in real time, and calculates the average temperature of the coolant flowing out of each battery pack assembly 10;

[0077] If the average temperature of the battery pack assembly 10 is lower than the temperature threshold, the first flow control valve 4 of the battery pack assembly 10 is not controlled to move;

[0078] If the average temperature of a certain battery pack assembly 10 is higher than the temperature threshold, the opening degree of the first flow control valve 4 of the battery pack assembly 10 is controlled to increase; and / or, the opening degree of the second flow control valve 5 is controlled to increase.

[0079] Exemplarily, the average temperature of the coolant flowing out of each battery pack assembly 10 can be: the sum of the temperature measurement data of each temperature measuring element 3211 of the battery pack assembly 10 is divided by the number of temperature measuring elements 3211 of the battery pack assembly 10, and then a constant is subtracted, and the obtained value is the average temperature. The constant can be obtained through multiple experiments.

[0080] If it is found that a certain battery pack 100 is abnormal and needs to be removed, the first flow control valve 4 and the second flow control valve 5 are both controlled to close, and the coolant in the liquid cooling plate of the battery pack 100 is emptied through the corresponding liquid discharge port.

[0081] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A liquid cooling system for dissipating heat from a battery pack (100) of an energy storage product, wherein the energy storage product comprises a plurality of battery pack assemblies (10) stacked in sequence in a vertical direction, each of the battery pack assemblies (10) comprising a plurality of battery packs (100) arranged in sequence in a horizontal direction, characterized in that: The liquid cooling system comprises: A primary pipeline (1) comprises a liquid inlet pipeline (11) and a liquid outlet pipeline (12), wherein the inlet end of the liquid inlet pipeline (11) is configured to communicate with a liquid cooling unit; A secondary pipeline (2), comprising a secondary liquid inlet pipe (21) and a secondary liquid outlet pipe (22), wherein the inlet end of the secondary liquid inlet pipe (21) is connected to the outlet end of the liquid inlet pipeline (11), and the outlet end of the secondary liquid outlet pipe (22) is connected to the inlet end of the liquid outlet pipeline (12); The tertiary pipeline (3) is arranged in one-to-one correspondence with the battery pack assembly (10), and comprises a head end pipeline (31), a connecting pipeline (32) and a terminal pipeline (33); the inlet end of the head end pipeline (31) is communicated with the secondary pipeline (2); the outlet end of the head end pipeline (31) is connected to the head end battery pack (100) in the battery pack assembly (10); one connecting pipeline (32) is arranged between any two adjacent battery packs (100); the inlet end of the terminal pipeline (33) is connected to the terminal battery pack (100) in the battery pack assembly (10); the outlet end of the terminal pipeline (33) is communicated with the secondary liquid outlet pipe (22); and the head end pipeline (31) and the terminal pipeline (33) are both provided with a first flow control valve (4).

2. The liquid cooling system according to claim 1, characterized in that: The connecting pipeline (32) comprises: A first pipeline (321), an inlet end of which is connected to one of the two adjacent battery packs (100); A second pipeline (323), an outlet end of which is connected to the other of the two adjacent battery packs (100); The three-way valve (322) comprises a first port, a second port and a drain port, wherein the first port is connected to the outlet end of the first pipeline (321), and the second port is connected to the inlet end of the second pipeline (323), and any one of the first port, the second port and the drain port can be selectively closed to allow the other two to be connected.

3. The liquid cooling system according to claim 2, characterized in that: A liquid discharge pipe connecting joint is arranged at the liquid discharge port.

4. The liquid cooling system according to claim 2, characterized in that: The first pipeline (321) is provided with a temperature measuring element (3211).

5. The liquid cooling system according to claim 4, characterized in that: A temperature measuring component installation tube (3212) is sleeved on the first pipeline (321), a temperature measuring component installation position is provided on the temperature measuring component installation tube (3212), and the temperature measuring component (3211) is installed at the temperature measuring component installation position.

6. The liquid cooling system according to claim 5, characterized in that: The temperature measuring element installation tube (3212) comprises: A main pipe (32121) is sleeved on the outer side of the first pipe (321); The branch pipe body (32122) is provided with an installation cavity which is connected with the main pipe body (32121), and the installation cavity is the installation position of the temperature measuring component.

7. The liquid cooling system according to claim 2, characterized in that: The three-way valve (322) is a T-type three-way ball valve.

8. The liquid cooling system according to claim 1, characterized in that: The secondary pipeline (2) further comprises a horizontal connecting pipe (23), and the inlet end of the liquid inlet pipeline (11) and the secondary liquid inlet pipe (21) are connected via the horizontal connecting pipe (23).

9. The liquid cooling system according to any one of claims 1 to 8, characterized in that: The liquid inlet pipeline (11) and the liquid outlet pipeline (12) are both provided with a second flow control valve (5).

10. An energy storage product, comprising a plurality of battery pack assemblies (10) stacked in sequence in a vertical direction, each of the battery pack assemblies (10) comprising a plurality of battery packs (100) arranged in sequence in a horizontal direction, characterized in that: The energy storage product also includes a liquid cooling system as described in any one of claims 1-9.

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