Immersed liquid-cooled battery pack and energy storage system

Abstract

The utility model discloses an immersed liquid-cooled battery pack and an energy storage system, the immersed liquid-cooled battery pack comprises a bottom tray, a battery module and a cover plate, the cover plate covers the bottom tray to define a loading cavity of the battery module, the bottom tray is provided with a liquid inlet joint and a liquid-cooled flow channel, the liquid-cooled flow channel is communicated with the liquid inlet joint, and the liquid inlet joint is communicated with the liquid-cooled flow channel; the liquid cooling flow channel is provided with a plurality of liquid inlets facing one side of the cover plate, and the cover plate is provided with a liquid outlet. The liquid cooling flow channel is arranged on the bottom tray, so that the bottom tray not only plays a role in supporting the battery module, but also serves as a flow channel part of the liquid cooling flow channel, and compared with a traditional mode that the liquid cooling flow channel is independently designed on the outer side of the battery pack, the number of parts of the whole system can be greatly reduced, and the cost of the liquid cooling structure can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage equipment, and more specifically, to an immersion liquid-cooled battery pack and an energy storage system. Background Art

[0002] The principle of an immersion liquid-cooled energy storage system is to completely immerse the battery pack in flowing coolant. The coolant contacts and flows along the surface of the battery cells, removing heat from the cells and dissipating it into the air through a temperature control system, ultimately achieving the goal of controlling the battery temperature. Existing immersion liquid cooling technology often designs the liquid cooling channel separately on the outside of the battery pack, which leads to high overall costs.

[0003] In summary, how to solve the problem of high cost of the liquid cooling structure of the immersion liquid-cooled energy storage system has become a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0004] In view of this, the present application provides an immersion liquid-cooled battery pack and energy storage system to solve the problem of high cost of the liquid cooling structure of the immersion liquid-cooled energy storage system.

[0005] To achieve the above objectives, this application provides the following technical solutions:

[0006] An immersion liquid-cooled battery pack includes a bottom tray, a battery module and a cover plate. The cover plate is covered on the top of the bottom tray to enclose a loading chamber for the battery module. The bottom tray is provided with a liquid inlet joint and a liquid cooling channel. The liquid cooling channel is connected to the liquid inlet joint. The liquid cooling channel is provided with multiple liquid inlets opened toward one side of the cover plate, and the cover plate is provided with a liquid outlet.

[0007] In some embodiments of the present application, the liquid-cooling channel is evenly distributed on the bottom tray; and / or the liquid inlet is evenly distributed on the liquid-cooling channel.

[0008] In some embodiments of the present application, the liquid cooling channel includes a main channel and multiple sub-channels connected to the main channel, the liquid inlet joint is arranged on the main channel, and each of the sub-channels is respectively provided with one or more liquid inlets.

[0009] In some embodiments of the present application, the main flow channel and the sub-flow channel are arranged at an angle.

[0010] In some embodiments of the present application, the battery module is assembled from a plurality of battery cell units, and any two adjacent sub-channels are arranged in parallel to form an installation position for the battery cell units. The battery cell units are arranged in the installation position in a one-to-one correspondence, and a reserved gap is formed between two adjacent battery cell units. The liquid inlet on the sub-channel is located in the corresponding reserved gap.

[0011] In some embodiments of the present application, the liquid outlet is configured as a long strip-shaped opening provided on the top surface of the cover plate, and the long strip-shaped opening is arranged in a one-to-one correspondence with the sub-channel.

[0012] In some embodiments of the present application, the liquid outlet is configured as a long strip-shaped opening provided on a side surface of the cover plate;

[0013] Alternatively, the liquid outlet is configured as a protective net structure formed on the top surface of the cover plate.

[0014] Compared with the background technology introduction, the above-mentioned immersion liquid-cooled battery pack, in actual application, connects the liquid inlet joint of the liquid cooling channel with the output pipe of the liquid cooling circulation pipeline, and connects the liquid outlet on the cover plate with the return pipe of the liquid cooling circulation pipeline. The coolant of the liquid cooling circulation pipeline can enter the liquid cooling channel through the liquid inlet joint, and then enter the loading chamber through the liquid inlet, thereby performing heat exchange cooling on the battery module in the loading chamber, and then flows out of the loading chamber through the liquid outlet and enters the return pipe to complete the circulation cooling process. Since the liquid cooling channel is arranged on the bottom tray, the bottom tray not only supports the battery module, but also acts as a flow channel component of the liquid cooling channel. Compared with the traditional method of designing the liquid cooling channel separately on the outside of the battery pack, it can greatly reduce the number of components of the overall system, which helps to reduce the cost of the liquid cooling structure.

[0015] On the other hand, the present application also provides an energy storage system, including a refrigeration device, an immersion liquid-cooled battery pack and a liquid cooling circulation pipeline connected between the refrigeration device and the immersion liquid-cooled battery pack, the immersion liquid-cooled battery pack is the immersion liquid-cooled battery pack described in any of the above schemes, the liquid cooling circulation pipeline includes an output pipe connected to the liquid outlet end of the refrigeration device and a return pipe connected to the liquid return end of the refrigeration device, the liquid inlet joint of the immersion liquid-cooled battery pack is connected to the output pipe, and the liquid outlet of the immersion liquid-cooled battery pack is connected to the return pipe.

[0016] In some embodiments of the present application, at least one battery cluster is included, and the battery cluster includes more than one immersion liquid-cooled battery pack. The immersion liquid-cooled battery packs belonging to the same battery cluster are stacked with gaps and connected to the same refrigeration device through a set of the liquid cooling circulation pipeline.

[0017] In some embodiments of the present application, the output pipe includes a main liquid supply line connected to the liquid outlet end and a plurality of branch liquid supply lines connected to the main liquid supply line, and the branch liquid supply lines are connected to the liquid inlet connectors of the immersion liquid-cooled battery pack in a one-to-one correspondence;

[0018] Alternatively, the submerged liquid-cooled battery packages belonging to the same battery cluster are placed in the same liquid-cooling cavity, and the liquid return pipe is connected to the liquid-cooling cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0020] Figure 1 A schematic diagram of the external structure of an immersion liquid-cooled battery pack provided in an embodiment of the present application;

[0021] Figure 2 A schematic diagram of the split structure of the immersion liquid-cooled battery pack provided in an embodiment of the present application;

[0022] Figure 3 A schematic diagram of the structure of the bottom tray provided in an embodiment of the present application (the parallel arrows in the figure represent the opening direction of the liquid inlet);

[0023] Figure 4 A schematic diagram of a structure in which the liquid outlet provided in an embodiment of the present application is configured as a long strip-shaped opening formed on the top surface of the cover plate;

[0024] Figure 5 A schematic diagram of the structure of the energy storage system provided in an embodiment of the present application;

[0025] Figure 6 The energy storage system provided in the embodiment of the present application does not show a schematic structural diagram of the liquid cooling chamber;

[0026] Figure 7 A schematic diagram of a structure in which the liquid outlet provided in an embodiment of the present application is configured to be formed on the side of the cover plate;

[0027] Figure 8 The liquid outlet provided in the embodiment of the present application is configured as a schematic diagram of a protective net structure formed on the top surface of the cover plate.

[0028] in, Figures 1-8 middle:

[0029] 1- bottom tray;

[0030] 11-Liquid inlet interface;

[0031] 12-liquid cooling channel;

[0032] 121-main channel;

[0033] 122-sub-flow channel;

[0034] 13-liquid inlet;

[0035] 2-Battery module;

[0036] 3-cover plate;

[0037] 30-liquid outlet;

[0038] 4-Liquid cooling circulation pipeline;

[0039] 41- output pipe;

[0040] 411- main liquid supply line;

[0041] 412-liquid supply branch line;

[0042] 42-liquid return pipe;

[0043] 5- Refrigeration equipment;

[0044] 6-Immersed liquid-cooled battery pack;

[0045] 7-Battery cluster;

[0046] 8-Liquid cooling cavity. DETAILED DESCRIPTION

[0047] The core of this application is to provide an immersion liquid-cooled battery pack and energy storage system to solve the problem of high cost of the liquid cooling structure of the immersion liquid-cooled energy storage system.

[0048] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0049] Reference Figures 1-4As shown, the present application provides an immersion liquid-cooled battery pack 6, which may specifically include a bottom tray 1, a battery module 2 and a cover plate 3. The cover plate 3 is covered on the top of the bottom tray 1 to enclose a loading chamber for the battery module 2. The connection between the cover plate 3 and the bottom tray 1 may be, but is not limited to, a fastener connection. In order to ensure the sealing between the two, corresponding sealing rings and other sealing components may be provided on the mating end surfaces of the two. The battery module 2 is installed in the loading chamber. The battery module 2 may be fixed on the bottom tray 1 in a manner that may be, but is not limited to, a fastener fixation. The bottom tray 1 is provided with The liquid inlet connector 11 and the liquid cooling channel 12, the liquid cooling channel 12 is connected to the liquid inlet connector 11, the liquid inlet connector 11 is mainly used to connect with the output pipe 41 of the liquid cooling circulation pipeline 4 to introduce the coolant into the liquid cooling channel 12, the liquid cooling channel 12 is arranged on the bottom tray 1, for example, it can be but not limited to being designed on the top side of the bottom tray 1, and the liquid cooling channel 12 is provided with a liquid inlet 13 opened toward the side of the cover plate 3, through which the coolant can enter the assembly chamber from the liquid cooling channel 12, and a liquid outlet 30 is provided on the cover plate 3, which is used to connect with the return pipe 42 of the liquid cooling circulation pipeline 4.

[0050] In actual application, refer to Figures 1-4 , combined with Figure 5 and Figure 6 By connecting the liquid inlet joint 11 of the liquid-cooling channel 12 with the output pipe 41 of the liquid-cooling circulation pipeline 4, and connecting the liquid outlet 30 on the cover plate 3 with the return liquid pipe 42 of the liquid-cooling circulation pipeline 4, the coolant in the liquid-cooling circulation pipeline 4 can enter the liquid-cooling channel 12 through the liquid inlet joint 11, and then enter the loading chamber through the liquid inlet 13, thereby performing heat exchange cooling on the battery module 2 in the loading chamber, and then flow out of the loading chamber through the liquid outlet 30 and enter the return liquid pipe 42, completing the circulation cooling process. Since the liquid-cooling channel 12 is arranged on the bottom tray 1, the bottom tray 1 not only supports the battery module, but also acts as a flow channel component of the liquid-cooling channel. Compared with the traditional method of designing the liquid-cooling channel separately on the outside of the battery pack, the number of components of the entire system can be greatly reduced, which helps to reduce the cost of the liquid cooling structure.

[0051] In some specific embodiments, reference Figure 3 As shown, the liquid cooling channels 12 are evenly distributed on the bottom tray 1, and the liquid inlets 13 are evenly distributed on the liquid cooling channels 12. This structural design allows the coolant to be more evenly distributed when entering the loading chamber, helping the coolant to flow through the battery module 2 in a more evenly distributed manner, thereby greatly improving the temperature uniformity of the battery module 2.

[0052] In some other specific embodiments, referring to Figure 3As shown, the liquid cooling channel 12 can specifically include a main channel 121 and multiple sub-channels 122 connected to the main channel 121. The liquid inlet connector 11 is provided on the main channel 121, and each sub-channel 122 is provided with one or more (i.e., at least one) liquid inlet 13. By designing it into this structural form, the coolant entering the liquid cooling channel 12 through the liquid inlet connector 11 can first enter a total main channel 121, and then be distributed to each sub-channel 122 by the main channel 121, which is more conducive to improving the uniformity of the coolant distribution. Among them, the multiple sub-channels 122 specifically refer to at least two, that is, two or more.

[0053] In a further embodiment, referring to Figure 3 As shown, the main channel 121 can be specifically designed to be arranged at an angle with the sub-channel 122. For example, when the angle between the main channel 121 and the sub-channel 122 is 90°, that is, when the sub-channel 122 is arranged perpendicular to the main channel 121, the main channel 121 can be designed to be located at the edge of the top side of the bottom tray 1, and the sub-channel 122 is laid on the top side of the bottom tray 1. This arrangement is simpler and more convenient for arranging the sub-channel 122. It also makes the reinforcement structure of the sub-channel 122 on the bottom tray 1 more evenly distributed, which helps to improve the stability of the bottom tray 1. Of course, it is understandable that the angle between the main channel 121 and the sub-channel 122 is not limited to a 90° angle, but can also be a non-90° angle, such as an angle of 30°, 45°, 60°, etc. In actual application, the configuration can be selected according to actual needs.

[0054] In some other specific embodiments, referring to Figure 2 Combine Figure 3 The battery module 2 can be assembled from multiple battery cells, wherein adjacent battery cells can be connected by connectors, such as connecting plates. Any two adjacent sub-channels 122 are arranged in parallel to form mounting locations for the battery cells. The battery cells are positioned in a one-to-one correspondence at the mounting locations, with a reserved gap formed between the adjacent battery cells. The liquid inlets on the sub-channels 122 are located within the corresponding reserved gaps. That is, a certain amount of space is reserved on both sides of the corresponding sub-channels 122 of the battery cells to allow coolant introduced from the liquid inlets on the sub-channels 122 to flow smoothly through this space to the liquid outlet. This structural design allows coolant to flow through the gap between adjacent battery cells, thereby helping to improve the cooling and heat exchange effect.

[0055] In some other specific embodiments, referring to Figure 1 、 Figure 2 and Figure 4As shown, the liquid outlet 30 can be specifically configured as a strip-shaped opening provided on the top surface of the cover plate 3, and the strip-shaped opening is arranged in a one-to-one correspondence with the sub-channel 122. This design reduces the flow resistance formed between the liquid inlet on the sub-channel 122 and the strip-shaped opening, and the coolant flows more smoothly.

[0056] Of course, it can be understood that the above-mentioned method of designing the liquid outlet 30 as a long strip opening on the top surface of the cover plate 3 is only an example of the embodiment of the present application. In actual application, reference is made to Figure 7 As shown, the liquid outlet 30 can also be constructed as a long strip opening provided on the side of the cover plate 3; for example, referring to Figure 8 As shown, the liquid outlet 30 is constructed as a protective net structure formed on the top surface of the cover plate 3. As long as it can drain the coolant, the configuration can be selected according to actual needs during actual application, and no further specific restrictions are made here.

[0057] On the other hand, the present application also provides an energy storage system, referring to Figure 5 and Figure 6 As shown, it may specifically include a refrigeration device 5, an immersed liquid-cooled battery pack 6, and a liquid-cooled circulation pipeline 4 connected between the refrigeration device 5 and the immersed liquid-cooled battery pack 6. The immersed liquid-cooled battery pack 6 is the immersed liquid-cooled battery pack described in any of the above schemes. The liquid-cooled circulation pipeline 4 may specifically include an output pipe 41 connected to the liquid outlet end of the refrigeration device 5 and a return liquid pipe 42 connected to the return liquid end of the refrigeration device 5. The liquid inlet joint 11 of the immersed liquid-cooled battery pack 6 is connected to the output pipe 41, and the liquid outlet 30 of the immersed liquid-cooled battery pack 6 is connected to the return liquid pipe 42. Among them, the refrigeration device 5 is mainly used to circulate coolant to the liquid-cooled circulation pipeline 4. Since the refrigeration device 5 itself belongs to the existing technology, it will not be repeated here. Since the aforementioned immersed liquid-cooled battery pack has the above-mentioned technical effects, the energy storage system with the immersed liquid-cooled battery pack should also have corresponding technical effects, which will not be repeated here.

[0058] It should be noted that the refrigeration device 5 may specifically include, but is not limited to, an oil cooler. An oil cooler, also known as an oil chiller, is a type of refrigeration device that uses oil as a coolant. It transfers heat from mechanical equipment to the cooling system through circulating oil, thereby reducing the temperature of the mechanical equipment.

[0059] In some other specific embodiments, referring to Figure 6As shown, the energy storage system may specifically include at least one battery cluster 7, which includes one or more (i.e., at least one) immersed liquid-cooled battery packs 6. When a battery cluster 7 includes multiple immersed liquid-cooled battery packs 6, the immersed liquid-cooled battery packs 6 of the same battery cluster 7 may be specifically designed to be stacked with gaps and connected to the same refrigeration device 5 via a set of liquid-cooling circulation pipes 4. By connecting the immersed liquid-cooled battery packs 6 of the same battery cluster 7 to the same refrigeration device 5 using a set of liquid-cooling circulation pipes 4, synchronous control of the immersed liquid-cooled battery packs 6 can be achieved, and the number of liquid-cooling circulation pipes 4 and refrigeration devices 5 configured can be reduced, which helps to reduce costs.

[0060] It should be noted that Figure 6 Only one battery cluster 7 is shown in the figure. The gap between two adjacent immersion liquid-cooled battery packs 6 can be achieved by setting a support, and the support can be designed to be an integrated structure with the bottom tray 1 or a split structure. In addition, the case of multiple battery clusters 7 is the same as the above. Figure 6 The situation is similar, so no relevant diagram is given.

[0061] In a further embodiment, referring to Figure 6 As shown, the output pipe 41 may specifically include a main liquid supply line 411 connected to the liquid outlet and multiple branch liquid supply lines 412 connected to the main liquid supply line 411. The branch liquid supply lines 412 are connected one-to-one with the liquid inlet connectors 11 of the immersed liquid-cooled battery pack 6. This design simplifies the layout of the output pipe 41. The main liquid supply line 411 uniformly supplies coolant to each branch liquid supply line 412, ensuring more consistent coolant supply temperature for each immersed liquid-cooled battery pack 6 and facilitating centralized control.

[0062] In addition, refer to Figure 5 Combine Figure 6 As shown, each immersed liquid-cooled battery pack 6 belonging to the same battery cluster 7 is preferably loaded in the same liquid-cooling cavity 8, and the liquid return pipe 42 is connected to the liquid-cooling cavity 8. Specifically, referring to Figure 6 As shown, the mouth of the return liquid pipe 42 can be optionally extended to above the immersed liquid-cooled battery pack 6 located at the top layer of the battery cluster 7. Such a design can ensure that the liquid level of the coolant in the liquid-cooling cavity 8 can only return to the return liquid end of the refrigeration equipment 5 through the return liquid pipe 42 after reaching a preset position above the immersed liquid-cooled battery pack 6 at the top layer.

[0063] It should be noted that the aforementioned “multiple” specifically refers to two or more.

[0064] It should also be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0065] As used in this application and the claims, unless the context clearly indicates an exception, the terms "a," "an," "an," and / or "the" are not intended to refer to the singular and may include the plural, unless the context clearly indicates otherwise. Generally speaking, the terms "comprises" and "include" only indicate the inclusion of the steps and elements specifically identified, and these steps and elements do not constitute an exclusive list. A method or apparatus may also include other steps or elements. The phrase "comprises a..." does not preclude the presence of additional identical elements in the process, method, product, or apparatus that includes the elements.

[0066] In the description of the embodiments of this application, unless otherwise specified, " / " represents or. For example, A / B can represent A or B. "And / or" in this article is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of this application, "plurality" means two or more than two.

[0067] This document uses specific examples to illustrate the principles and implementation methods of this application. The description of the above examples is only intended to help understand the core ideas of this application. It should be noted that for those skilled in the art, without departing from the principles of this application, various improvements and modifications can be made to this application, and such improvements and modifications also fall within the scope of protection of the claims of this application.

Claims

1. An immersion liquid-cooled battery pack, characterized in that: The invention comprises a bottom tray (1), a battery module (2) and a cover plate (3), wherein the cover plate (3) covers the top of the bottom tray (1) to enclose a loading chamber for the battery module (2), a liquid inlet joint (11) and a liquid cooling channel (12) are provided on the bottom tray (1), the liquid cooling channel (12) is communicated with the liquid inlet joint (11), a plurality of liquid inlets (13) opened toward one side of the cover plate (3) are provided on the liquid cooling channel (12), and a liquid outlet (30) is provided on the cover plate (3).

2. The immersion liquid-cooled battery pack according to claim 1, wherein: The liquid cooling channel (12) is evenly distributed on the bottom tray (1); and / or the liquid inlets (13) are evenly distributed on the liquid cooling channel (12).

3. The immersion liquid-cooled battery pack according to claim 1, wherein: The liquid cooling channel (12) comprises a main channel (121) and a plurality of sub-channels (122) all connected to the main channel (121); the liquid inlet joint (11) is arranged on the main channel (121); and each of the sub-channels (122) is respectively provided with one or more liquid inlets (13).

4. The immersion liquid-cooled battery pack according to claim 3, wherein: The main flow channel (121) and the sub-flow channel (122) are arranged at an angle.

5. The immersion liquid-cooled battery pack according to claim 3, wherein: The battery module (2) is assembled from a plurality of battery cell units, and any two adjacent sub-flow channels (122) are arranged in parallel to form installation positions for the battery cell units. The battery cell units are arranged in the installation positions in a one-to-one correspondence, and a reserved gap is formed between the two adjacent battery cell units. The liquid inlet on the sub-flow channel (122) is located in the corresponding reserved gap.

6. The immersion liquid-cooled battery pack according to claim 3, wherein: The liquid outlet (30) is configured as a long strip-shaped opening provided on the top surface of the cover plate (3), and the long strip-shaped opening is arranged in a one-to-one correspondence with the sub-flow channel (122).

7. The immersion liquid-cooled battery pack according to claim 1, wherein: The liquid outlet (30) is configured as a long strip-shaped opening provided on the side of the cover plate (3); Alternatively, the liquid outlet (30) is configured as a protective net structure formed on the top surface of the cover plate (3).

8. An energy storage system comprising a refrigeration device (5), an immersion liquid-cooled battery pack (6), and a liquid cooling circulation pipeline (4) connected between the refrigeration device (5) and the immersion liquid-cooled battery pack (6), characterized in that: The submerged liquid-cooled battery pack (6) is an submerged liquid-cooled battery pack according to any one of claims 1 to 7, the liquid cooling circulation pipeline (4) comprises an output pipe (41) connected to the liquid outlet end of the refrigeration device (5) and a liquid return pipe (42) connected to the liquid return end of the refrigeration device (5), the liquid inlet joint (11) of the submerged liquid-cooled battery pack (6) is connected to the output pipe (41), and the liquid outlet (30) of the submerged liquid-cooled battery pack (6) is communicated with the liquid return pipe (42).

9. The energy storage system according to claim 8, characterized in that: The invention comprises at least one battery cluster (7), wherein the battery cluster (7) comprises one or more immersion-type liquid-cooled battery packs (6), and the immersion-type liquid-cooled battery packs (6) belonging to the same battery cluster (7) are stacked in a gap-like manner and connected to the same refrigeration device (5) via a set of the liquid-cooling circulation pipelines (4).

10. The energy storage system according to claim 9, wherein: The output pipe (41) comprises a main liquid supply line (411) connected to the liquid outlet end and a plurality of branch liquid supply lines (412) connected to the main liquid supply line (411), wherein the branch liquid supply lines (412) are in one-to-one communication with the liquid inlet connectors (11) of the submerged liquid-cooled battery pack (6); Alternatively, each immersed liquid-cooled battery pack (6) belonging to the same battery cluster (7) is loaded in the same liquid-cooling cavity (8), and the liquid return pipe (42) is connected to the liquid-cooling cavity (8).

Images