Liquid-cooled battery pack and energy storage system

Abstract

The utility model discloses a liquid-cooled battery pack and an energy storage system. The liquid-cooled battery pack comprises a water cooling plate and a shell, the shell is connected to the water cooling plate, a cavity for accommodating a battery cell is formed between the shell and the water cooling plate, the shell is provided with an exhaust port and a fire-fighting water injection joint, the fire-fighting water injection joint is used for being connected with a water injection pipeline, the shell is provided with a blocking component, and the blocking component is used for blocking or conducting the exhaust port. According to the liquid-cooled battery pack disclosed by the invention, the fire-fighting water injection joint connected with the water injection pipeline is arranged on the shell, and if the battery cell in the battery pack has a thermal runaway phenomenon, water can be injected into the shell through the fire-fighting water injection joint to submerge the battery cell, so that the thermal runaway condition of the battery cell is controlled. The heat in the battery cell thermal runaway shell is sharply increased, the internal pressure is also sharply increased, and the exhaust port can be conducted by the arrangement of the plugging part under the condition that the air pressure in the shell is increased, so that the internal pressure can be reduced, explosion can be prevented, and water for cooling the battery cell can smoothly and completely submerge the battery cell and is discharged from the exhaust port.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage, and in particular to a liquid-cooled battery pack and an energy storage system. Background Art

[0002] When thermal runaway occurs in the energy storage system, water flooding or flame-retardant gas filling and covering are usually used to extinguish the fire and cool down. The waterproof level of the liquid-cooled battery pack of the energy storage system is very high, reaching IP67. If water firefighting is directly used on the liquid-cooled battery pack to control thermal runaway, water cannot or is difficult to enter the interior from the outer shell to flood the battery cells. Even if water enters the shell, the water cannot completely flood the battery cells because of the high air pressure inside the shell. Even if a pressure relief valve is installed on the shell, the pressure relief valve is usually located low, which will cause the water to fail to flood the battery cells and be discharged by the pressure relief valve. If the method of flame-retardant gas coating the battery cells is used, if the battery cells have thermal runaway, the air pressure inside the shell will increase rapidly, thereby opening the pressure relief valve, and the flame-retardant gas injected into the shell will leak out from the pressure relief valve, and the battery cells cannot be completely wrapped to achieve the purpose of thermal runaway control.

[0003] In view of this, the present utility model is proposed. Utility Model Content

[0004] In order to solve one of the above technical problems, the utility model provides a liquid-cooled battery pack and an energy storage system.

[0005] The utility model adopts the following technical solutions:

[0006] The first object of the present application is to provide a liquid-cooled battery pack, comprising:

[0007] Water cooling plate;

[0008] A shell, wherein the shell has a mounting port, the shell is connected to the water-cooling plate, the water-cooling plate closes the mounting port, a cavity for accommodating the battery cell is formed between the shell and the water-cooling plate, an exhaust port and a fire water injection joint are provided on the shell, the fire water injection joint is used to connect the water injection pipeline, and a blocking component is provided on the shell, the blocking component is used to block or conduct the exhaust port;

[0009] Wherein, the exhaust port is arranged at one end of the shell away from the water cooling plate.

[0010] Optionally, the housing comprises a top shell and a side shell arranged on the peripheral edge of the top shell, and the side shell encloses to form the installation opening;

[0011] The side shell is connected to the water cooling plate;

[0012] The exhaust port is disposed on the top shell.

[0013] Optionally, the fire water injection joint is connected to the top shell or the side shell.

[0014] Optionally, the side shell includes four side panels located at the peripheral edges of the top shell;

[0015] Two adjacent side panels are connected vertically;

[0016] The fire-fighting water injection joint is arranged on one of the side plates.

[0017] Optionally, the side panel comprises a main panel body and a secondary panel body;

[0018] An opening is formed in the middle of the main board body;

[0019] The auxiliary plate body is detachably mounted on the main plate body, and the auxiliary plate body covers the opening, and the auxiliary plate body and the main plate body are sealed and connected;

[0020] The fire-fighting water injection joint is arranged on the auxiliary plate body.

[0021] Optionally, the water-cooling plate has an extension plate extending out of a side plate where the auxiliary plate body is located;

[0022] A cooling water joint is arranged on the extension plate.

[0023] Optionally, the cooling water joint is perpendicular to the water cooling plate;

[0024] The fire-fighting water injection joint comprises a seat portion and a joint pipe section, wherein the seat portion is connected to the auxiliary plate body, the joint pipe section is vertically connected to the seat portion, and the joint pipe section is parallel to the cooling water joint.

[0025] The second object of the present application is to provide an energy storage system, comprising:

[0026] Box;

[0027] A plurality of liquid-cooled battery packs, each of which is disposed in the box;

[0028] A water injection pipeline, wherein the water injection pipeline is at least partially arranged in the box body, and the water injection pipeline is respectively connected to the fire water injection joints of each of the liquid-cooled battery packs.

[0029] Optionally, including multiple clusters of liquid-cooled battery packs;

[0030] The water injection pipeline includes a plurality of main pipelines, each of which extends along the arrangement direction of each liquid-cooled battery pack of the corresponding cluster, and each of the main pipelines is connected to a fire water injection joint on each liquid-cooled battery pack of the corresponding cluster through a branch pipeline;

[0031] Wherein, valves are arranged on the main pipeline and the branch pipeline.

[0032] By adopting the above technical solution, the utility model has the following beneficial effects:

[0033] The liquid-cooled battery pack of the present application is provided with a fire-fighting water injection joint connected to the water injection pipeline on the shell. If the battery cells in the battery pack are in thermal runaway, water can be injected into the shell through the fire-fighting water injection joint to submerge the battery cells, thereby controlling the thermal runaway of the battery cells. When the battery cells are in thermal runaway, the heat in the shell increases sharply, and the internal pressure also increases sharply. The setting of the blocking part can open the exhaust port when the air pressure inside the shell increases, which can not only reduce the internal pressure and prevent explosion, but also ensure that the water used to cool the battery cells can smoothly and completely submerge the battery cells and be discharged from the exhaust port.

[0034] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings are part of this application and are used to provide a further understanding of the utility model. The schematic embodiments of the utility model and their descriptions are used to explain the utility model, but do not constitute an improper limitation on the utility model. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0036] Figure 1 A schematic diagram of the structure of a liquid-cooled battery pack provided in an embodiment of the present application;

[0037] Figure 2 for Figure 1 Enlarged view of part A in the middle;

[0038] Figure 3 A schematic diagram of the structure of the shell of the liquid-cooled battery pack provided in an embodiment of the present application;

[0039] Figure 4 A schematic diagram of the structure of the energy storage system provided in an embodiment of the present application with a liquid-cooled battery pack hidden.

[0040] In the figure, the water-cooled plate 1, the extension plate 11, the cooling water connector 12, the outer shell 2, the top shell 21, the side shell 22, the side plate 221, the main plate body 2211, the sub-plate body 2212, the opening 2213, the exhaust port 201, the installation port 202, the fire water injection connector 3, the seat 31, the connector pipe section 32, the blocking component 4, the box body 5, the water injection pipeline 6, and the valve 61.

[0041] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.

[0043] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying 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 component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "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 mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Embodiment 1

[0045] See also Figures 1 to 4 As shown, the first embodiment of the present application provides a liquid-cooled battery pack, including a water-cooled plate 1 and a shell 2. The shell 2 is connected to the water-cooled plate 1, and a cavity for accommodating a battery cell is formed between the shell 2 and the water-cooled plate 1. The shell 2 is provided with an exhaust port 201 and a fire water injection joint 3, and the fire water injection joint 3 is used to connect the water injection pipeline 6. The shell 2 is provided with a blocking component 4, and the blocking component 4 is used to block or conduct the exhaust port 201. The liquid-cooled battery pack of the present application is provided with a fire water injection joint 3 connected to the water injection pipeline 6 on the shell 2. If the battery cell in the battery pack has a thermal runaway phenomenon, the fire water injection joint 3 can be used to inject water into the shell 2 and submerge the battery cell, thereby controlling the thermal runaway of the battery cell. When the battery cell is in thermal runaway, the heat in the shell 2 increases sharply, and the internal pressure also increases sharply. The setting of the blocking part can conduct the exhaust port 201 when the pressure increases, which can reduce the air pressure inside the cavity and prevent explosion. The exhaust port 201 may be disposed at the top of the housing 2 , namely, at the side opposite to the water cooling plate 1 , and may also ensure that the water entering the air completely submerges the battery cell and is discharged from the exhaust port 201 .

[0046] It should be noted that the sealing part can be an explosion-proof valve. When the pressure in the cavity exceeds the set value, the explosion-proof valve will automatically open and release part of the fluid to ensure the safety of the system. The explosion-proof valve is usually composed of a valve body, a spring and a piston. The principle of the explosion-proof valve is a mature existing technology. This application does not improve the explosion-proof valve and directly uses the explosion-proof valve sold on the market.

[0047] In a possible implementation, the shell 2 has a mounting port 202. The water-cooled plate 1 is connected to the shell 2, and the water-cooled plate 1 closes the mounting port 202. The exhaust port 201 is provided at one end of the shell 2 away from the water-cooled plate 1. The water-cooled plate closes the mounting port 202, which not only protects the battery cell, but also can fully contact the battery cell to efficiently cool the battery cell. The battery cell is attached to the water-cooled plate, and the water-cooled plate 1 is located at the bottom end of the battery pack. The side of the shell opposite to the water-cooled plate is the top end of the battery pack. By providing the exhaust port 201 at the top end of the shell, when the battery pack is subjected to fire-fighting treatment, the cooling water can completely submerge the battery cell, and finally be discharged from the exhaust port 201 on the shell 2, and the fire-fighting treatment effect is better.

[0048] In a possible implementation, the housing 2 includes a top housing 21 and a side housing 22 disposed on the peripheral edge of the top housing 21, the side housing 22 encloses the mounting port 202, the side housing 22 is connected to the water cooling plate 1, and the exhaust port 201 is disposed on the top housing 21. The top housing 21 is the highest position of the housing 2, and the top housing 21 is higher than each battery cell. By arranging the exhaust port 201 on the top housing, it can be ensured that the liquid injected into the housing 2 completely submerges the battery cells inside.

[0049] In a possible implementation, the fire water injection connector 3 is connected to the top shell 21 or the side shell 22. The fire water injection connector 3 can be installed at a suitable position on the shell according to different energy storage systems and different requirements for the battery pack. The installation position of the fire water injection connector 3 is not limited in this application.

[0050] In a possible implementation, the side shell 22 includes four side panels 221 located on the lateral edges of the top shell 21. Two adjacent side panels 221 are vertically connected, and the fire water injection connector 3 is disposed on one of the side panels 221. In the energy storage system, the battery packs are often arranged in sequence from bottom to top, and the intervals between adjacent battery packs are usually small. Therefore, if the fire water injection connector 3 is disposed on the top plate, it may affect the longitudinal arrangement of the battery pack. Therefore, the present application preferably disposes the fire water injection connector 3 on the side panel 221, which is more convenient for connection with the water injection pipeline 6, does not affect the installation of other battery packs, and saves space in the energy storage system.

[0051] In a possible implementation, the side panel 221 includes a main panel 2211 and a sub-panel 2212. An opening 2213 is provided in the middle of the main panel 2211, and the sub-panel 2212 is detachably mounted on the main panel 2211, and the sub-panel 2212 covers the opening 2213, and the sub-panel 2212 and the main panel 2211 are sealed and connected. The fire water injection joint 3 is arranged on the sub-panel 2212. The sub-panel 2212 is used to arrange various connectors (sockets or connection terminals). The above structure and the fire water injection joint 3 are arranged on the same sub-panel 2212. During the assembly operation, each connector can be pre-installed on the sub-panel 2212, and then the sub-panel 2212 is connected to the main panel 2211, thereby simplifying the assembly process and improving the assembly efficiency, and the sub-panel 2212 can be detachably arranged, which is convenient for later maintenance.

[0052] In a possible implementation, the water-cooled plate has an extension plate extending out of the side plate 221 where the auxiliary plate body 2212 is located, and a cooling water connector 12 is provided on the extension plate. By providing a cooling water connector 12 on the extension plate exposed to the outer shell 2, the water-cooled plate can facilitate the connection and installation of the cooling water pipe therewith.

[0053] In a possible implementation, the cooling water joint 12 is perpendicular to the water-cooled plate. The fire water injection joint 3 has a seat 31 and a joint pipe section 32, wherein the seat 31 is connected to the sub-plate body 2212, the joint pipe section 32 is perpendicularly connected to the seat 31, and the joint pipe section 32 is parallel to the cooling water joint 12. In this way, the water injection pipeline connected to the fire water injection joint 3 and the cooling water pipeline connected to the cooling water joint 12 are parallel near the battery pack, which facilitates the arrangement and assembly of the pipelines. After assembly, the pipelines are arranged neatly and orderly without confusion, which is convenient for later maintenance. Embodiment 2

[0054] See also Figure 4 As shown, the second embodiment of the present application provides an energy storage system, including a box body 5, a water injection pipeline 6 and a plurality of liquid-cooled battery packs in the above-mentioned first embodiment. Each of the liquid-cooled battery packs is arranged in the box body 5, and the water injection pipeline 6 is at least partially arranged in the box body 5, and the water injection pipeline 6 is respectively connected to the fire water injection joint 3 of each of the liquid-cooled battery packs. In the energy storage system provided in this embodiment, if the battery cells in the battery pack have thermal runaway, the water injection pipeline 6 can inject water into the outer casing 2 through the fire water injection joint 3 and submerge the battery cells, thereby controlling the thermal runaway of the battery cells.

[0055] In a possible implementation, the energy storage system includes multiple clusters of liquid-cooled battery packs, and the water injection pipeline 6 includes multiple main pipelines, each of which extends along the arrangement direction of each liquid-cooled battery pack of the corresponding cluster, and each of the main pipelines is connected to the fire water injection joint 3 on each liquid-cooled battery pack of the corresponding cluster through multiple branch pipelines. Wherein, valves 61 are provided on both the main pipeline and the branch pipeline. The liquid-cooled battery packs in the energy storage system are arranged in multiple columns, and each column of liquid-cooled battery packs is a cluster of liquid-cooled battery packs. Each main pipeline extends along a corresponding cluster of liquid-cooled battery packs, and multiple liquid-cooled battery packs in the same cluster are connected to the main pipeline through branch pipelines. A valve 61 is provided on each branch pipeline. When a battery pack fails, only the valve 61 on the branch pipeline connected to the battery pack can be controlled to open to inject water into the battery pack, and other battery packs do not need to be filled with water, thereby reducing losses.

[0056] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Although the utility model has been disclosed as a preferred embodiment as above, it is not used to limit the utility model. Any technician familiar with this patent can make some changes or modify the technical content suggested above into an equivalent embodiment with equivalent changes without departing from the scope of the technical solution of the utility model. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the content of the technical solution of the utility model still falls within the scope of the solution of the utility model.

Claims

1. A liquid-cooled battery pack, characterized in that: include: Water cooling plate; A shell, wherein the shell has a mounting port, the shell is connected to the water-cooling plate, the water-cooling plate closes the mounting port, a cavity for accommodating the battery cell is formed between the shell and the water-cooling plate, an exhaust port and a fire water injection joint are provided on the shell, the fire water injection joint is used to connect the water injection pipeline, and a blocking component is provided on the shell, the blocking component is used to block or conduct the exhaust port; Wherein, the exhaust port is arranged at one end of the shell away from the water cooling plate.

2. The liquid-cooled battery pack according to claim 1, characterized in that: The housing comprises a top shell and a side shell arranged on the peripheral edge of the top shell, and the side shells enclose to form the installation opening; The side shell is connected to the water cooling plate; The exhaust port is disposed on the top shell.

3. The liquid-cooled battery pack according to claim 2, characterized in that: The fire-fighting water injection joint is connected to the top shell or the side shell.

4. The liquid-cooled battery pack according to claim 3, characterized in that: The side shell includes four side panels located at the peripheral edges of the top shell; Two adjacent side panels are connected vertically; The fire-fighting water injection joint is arranged on one of the side plates.

5. The liquid-cooled battery pack according to claim 4, characterized in that: The side panel comprises a main panel body and a secondary panel body; An opening is formed in the middle of the main board body; The auxiliary plate body is detachably mounted on the main plate body, and the auxiliary plate body covers the opening, and the auxiliary plate body and the main plate body are sealed and connected; The fire-fighting water injection joint is arranged on the auxiliary plate body.

6. The liquid-cooled battery pack according to claim 5, characterized in that: The water cooling plate has an extension plate extending out of the side plate where the auxiliary plate body is located; A cooling water joint is arranged on the extension plate.

7. The liquid-cooled battery pack according to claim 6, characterized in that: The cooling water joint is perpendicular to the water cooling plate; The fire-fighting water injection joint comprises a seat portion and a joint pipe section, wherein the seat portion is connected to the auxiliary plate body, the joint pipe section is vertically connected to the seat portion, and the joint pipe section is parallel to the cooling water joint.

8. An energy storage system, characterized in that: include: Box; A plurality of liquid-cooled battery packs according to any one of claims 1 to 7, each of the liquid-cooled battery packs being disposed in the box; A water injection pipeline, wherein the water injection pipeline is at least partially arranged in the box body, and the water injection pipeline is respectively connected to the fire water injection joints of each of the liquid-cooled battery packs.

9. The energy storage system according to claim 8, characterized in that: Includes multi-cluster liquid-cooled battery packs; The water injection pipeline includes a plurality of main pipelines, each of which extends along the arrangement direction of each liquid-cooled battery pack of the corresponding cluster, and each of the main pipelines is connected to a fire water injection joint on each liquid-cooled battery pack of the corresponding cluster through a branch pipeline; Wherein, valves are arranged on the main pipeline and the branch pipeline.

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