Discharge device of battery energy storage system

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery energy storage system discharging device which comprises a box body and a battery pack, the battery pack is arranged in a containing cavity of the box body and comprises a plurality of battery packs, the box body is provided with a first side plate, and a plurality of exhaust channels are arranged on the first side plate. The pressure release valve of each battery pack in the battery pack is respectively communicated with an exhaust passage, the exhaust passages are communicated with the outside, all the exhaust passages are arranged at intervals along the vertical direction, the included angle theta between the length direction of each exhaust passage and the vertical direction is more than 0 degree and less than 180 degrees, the theta is not equal to 90 degrees, and the first direction is vertical to the vertical direction. According to the discharge device of the battery energy storage system, the exhaust channel is obliquely arranged with the included angle formed between the exhaust channel and the vertical direction, so that substances sprayed out by the pressure release valve can be actively discharged to the outside along the exhaust channel under the action of gravity, retention of gas, a small amount of liquid or condensed substances in the exhaust channel is reduced, the discharge is smooth, the pressure release effect is good, and the service life of the battery energy storage system is prolonged. The safety performance is high.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery energy storage system emission device. Background Technology

[0002] Lithium-ion batteries have gradually become the mainstream energy storage product due to their advantages such as high energy density, long lifespan, high rated voltage, high power handling capacity, and low self-discharge rate. The large-scale application of lithium-ion battery energy storage systems has made outstanding contributions to ensuring the safe and stable operation of the power grid.

[0003] With the large-scale application of lithium battery energy storage systems, their fire hazards have gradually gained attention. Due to the high concentration of batteries in the energy storage system, factors such as overcharging, over-discharging, overheating, and mechanical collisions in some batteries can easily cause the battery separator to collapse and internal short circuits to occur. This can cause the battery temperature to reach the ignition point of the internal materials, resulting in thermal runaway. This can then lead to thermal runaway of adjacent battery cells, ultimately causing a fire accident in the entire lithium battery energy storage system. In severe cases, it can even cause an explosion, creating a safety hazard. Utility Model Content

[0004] The purpose of this invention is to provide a battery energy storage system emission device with a simple structure that can quickly discharge high-temperature gas generated by thermal runaway to the outside, effectively reducing the risk of energy storage system explosion.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A battery energy storage system discharge device is provided, including a housing and a battery pack. The housing has a receiving cavity, and the battery pack is disposed in the receiving cavity. The battery pack includes multiple battery packs arranged at intervals along a vertical direction. The housing has a first side plate arranged along a first direction, and an exhaust channel group is provided on the first side plate. The exhaust channel group includes multiple exhaust channels. The pressure relief valve of each battery pack in the battery pack is connected to one of the exhaust channels, and each exhaust channel can communicate with the outside. All the exhaust channels are arranged at intervals along the vertical direction, and the angle between the length direction of the exhaust channel and the vertical direction is θ, where 0° < θ < 180°, θ ≠ 90°, wherein the first direction is perpendicular to the vertical direction.

[0007] As a preferred embodiment of the battery energy storage system emission device, the battery energy storage system emission device includes multiple battery packs, all of which are spaced apart along a second direction. Multiple sets of exhaust channels are provided on the first side plate corresponding to the multiple battery packs, wherein the first direction and the vertical direction are both perpendicular to the second direction.

[0008] As a preferred embodiment of the battery energy storage system emission device, a drainage channel is also provided on the first side plate. The drainage channel extends along the vertical direction and passes through both sides of the first side plate along the vertical direction. The exhaust channels in two adjacent exhaust channel groups are respectively connected to both sides of the drainage channel along the second direction.

[0009] As a preferred embodiment of the discharge device for a battery energy storage system, the housing has two second side plates arranged along the second direction. The first side plate includes a mounting plate and a plurality of first grooves and a plurality of second grooves disposed on the mounting plate. The mounting plate connects the two second side plates. The plurality of second grooves are spaced apart along the second direction, and the length of each second groove extends along the vertical direction. Each second groove is provided with a drainage groove. The mounting plate blocks the opening of the drainage groove to form the drainage channel. A first groove group is provided between the second side plate and the second groove and / or between two adjacent second grooves. The first groove group includes a plurality of first grooves spaced apart along the vertical direction. Each first groove is provided with an exhaust groove. The mounting plate blocks the opening of the exhaust groove to form the exhaust channel.

[0010] As a preferred embodiment of the emission device for a battery energy storage system, an installation gap is formed between two adjacent battery packs, and the second tank is disposed within the installation gap.

[0011] As a preferred embodiment of the discharge device for a battery energy storage system, the length of the first tank extends along a third direction, and at least two adjacent first tanks are stacked along the third direction.

[0012] As a preferred embodiment of the emission device for a battery energy storage system, a communication port is provided on the second side plate, through which the exhaust channel can communicate with the outside.

[0013] As a preferred embodiment of the battery energy storage system emission device, the battery energy storage system emission device further includes a sealing gasket, wherein the first tank extends at least partially outside the communication port, and the sealing gasket is disposed between the first tank and the cavity wall of the communication port; and / or,

[0014] The pressure relief valve of the battery pack is connected to the side of the first tank away from the mounting plate, and the connection position of the pressure relief valve to the first tank is located at the end of the first tank adjacent to the communication port.

[0015] As a preferred embodiment of the battery energy storage system emission device, the battery energy storage system emission device further includes multiple support plates, which are spaced apart along the vertical direction, and the battery pack is disposed on the support plates.

[0016] As a preferred embodiment of the emission device for a battery energy storage system, the support plate is a liquid-cooled plate, which is connected to an external heat exchange system.

[0017] The beneficial effects of this utility model are as follows: By setting multiple exhaust channels and connecting the pressure relief valves of each battery pack in the battery pack to an exhaust channel, the gas generated when the battery pack experiences thermal runaway can be promptly ejected through the pressure relief valves into the exhaust channels and discharged to the outside. This reduces energy transfer through thermal runaway gas flow and thermal radiation between adjacent battery packs, thereby reducing the triggering of thermal runaway in other adjacent battery packs and effectively improving the safety of the energy storage system. By setting the exhaust channels at an angle to the vertical direction, the substances ejected from the pressure relief valves can be actively discharged to the outside along the exhaust channels under the action of gravity, reducing the retention of gas, small amounts of liquid, or condensates in the exhaust channels, resulting in smooth discharge, good pressure relief effect, and high safety performance. Attached Figure Description

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the structure of the emission device of the battery energy storage system according to an embodiment of the present invention;

[0020] Figure 2 This is a cross-sectional view of the emission device of the battery energy storage system according to an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the structure of the first side plate in an embodiment of this utility model.

[0022] In the picture:

[0023] 1. Housing; 11. Receiving cavity; 12. First side plate; 121. Mounting plate; 122. First groove; 123. Second groove; 13. Second side plate; 131. Connecting port; 14. Installation gap; 15. Support plate; 2. Battery pack; 21. Battery bag; 211. Pressure relief valve; 3. Exhaust channel; 4. Drainage channel. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0025] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0028] like Figure 1 and Figure 2 As shown, the battery energy storage system discharge device of this utility model embodiment includes a housing 1 and a battery pack 2. The housing 1 is provided with a receiving cavity 11, and the battery pack 2 is disposed in the receiving cavity 11. The battery pack 2 includes a plurality of battery packs 21 arranged at intervals along the vertical direction (the vertical direction is the Z direction shown in the figure). The housing 1 has a first side plate 12 arranged along a first direction (the first direction is the X direction shown in the figure). An exhaust channel group is provided on the first side plate 12. The exhaust channel group includes a plurality of exhaust channels 3. The pressure relief valve 211 of each battery pack 21 in the battery pack 2 is connected to an exhaust channel 3, and each exhaust channel 3 can communicate with the outside. All exhaust channels 3 are arranged at intervals along the vertical direction, and the angle between the length direction of the exhaust channel 3 and the vertical direction is θ, 0°<θ<180°, θ≠90°, wherein the first direction is perpendicular to the vertical direction.

[0029] It is understandable that by setting up multiple exhaust channels 3 and connecting the pressure relief valves 211 of each battery pack 21 in the battery pack 2 to one exhaust channel 3, the gas generated when the battery pack 21 experiences thermal runaway can be promptly ejected through the pressure relief valves 211 into the exhaust channels 3 and discharged to the outside. This ensures that the thermal runaway gas of each battery pack 21 is discharged independently, avoiding the mixing and accumulation of gas in the housing 1. It also reduces the energy transfer between adjacent battery packs 21 through thermal runaway gas flow, heat radiation, and other pathways, thereby reducing the triggering of thermal runaway in other adjacent battery packs 21 and effectively improving the safety of the energy storage system. By setting the exhaust channels 3 at an angle to the vertical direction, the substances ejected by the pressure relief valves 211 can be actively discharged to the outside along the exhaust channels 3 under the action of gravity, reducing the retention of gas, small amounts of liquid, or condensate in the exhaust channels 3. This results in smooth discharge, good pressure relief effect, and high safety performance.

[0030] For example, the angle θ between the length direction of the exhaust channel 3 and the vertical direction is 10°, 20°, 30°, 40°, 45°, 60°, 75°, 80°, 100°, 110°, 120°, 135°, 140°, 150°, 160°, 170°, etc.

[0031] Furthermore, such as Figure 2 As shown, the battery energy storage system emission device includes multiple battery packs 2, all of which are spaced apart along a second direction (the second direction is the Y direction shown in the figure). The first side plate 12 is provided with multiple sets of exhaust channels corresponding to the multiple battery packs 2. The first direction and the vertical direction are both perpendicular to the second direction. By setting multiple battery packs 2, the energy storage capacity of the battery energy storage system is increased, and multiple sets of exhaust channels are provided so that each battery pack 2 has a corresponding exhaust channel group. This ensures that each battery pack 21 in each battery pack 2 has an independent exhaust channel 3, so that the gas generated when the battery pack 21 experiences thermal runaway is promptly ejected through the pressure relief valve 211 into the exhaust channel 3 and discharged to the outside.

[0032] Furthermore, a drainage channel is also provided on the first side plate. The drainage channel extends vertically and runs through both sides of the first side plate in the vertical direction. The exhaust channels in two adjacent exhaust channel groups are respectively connected to the two sides of the drainage channel in the second direction. By setting up the drainage channel 4, on the one hand, it can increase the connection port 131 between the exhaust channel 3 and the outside, improve the discharge efficiency of the exhaust channel 3, and on the other hand, rainwater can enter from the top port of the drainage channel 4 to flush the drainage channel 4 and part of the exhaust channel 3, so as to reduce the accumulation of flies, dust and other impurities in the drainage channel 4 and the exhaust channel 3, and ensure the smooth flow of the channels. When the battery energy storage system is equipped with multiple battery packs 2, the setting up of the drainage channel 4 ensures that the corresponding exhaust channel 3 in each battery pack 2 can not only discharge to the outside at both ends along its own length direction, but also connect to the outside through the drainage channel 4, shortening the distance between the pressure relief valve 211 of each battery pack 21 and the outside, and avoiding the excessive pressure relief distance of the battery pack 21 located inside the battery pack 2, which would affect the pressure relief efficiency.

[0033] In some embodiments, such as Figure 2 and Figure 3 As shown, the housing 1 has two second side plates 13 arranged along a second direction. The first side plate 12 includes a mounting plate 121 and a plurality of first grooves 122 and a plurality of second grooves 123 disposed on the mounting plate 121. The mounting plate 121 connects the two second side plates 13. The plurality of second grooves 123 are spaced apart along the second direction, and the length of each second groove 123 extends along the vertical direction. Each second groove 123 is provided with a drainage groove. The mounting plate 121 blocks the groove opening of the drainage groove to form a drainage channel 4. A first groove group is provided between the second side plate 13 and the second groove 123 and between two adjacent second grooves 123. The first groove group includes a plurality of first grooves 122 spaced apart along the vertical direction. Each first groove 122 is provided with an exhaust groove. The mounting plate 121 blocks the groove opening of the exhaust groove to form an exhaust channel 3. It should be noted that the groove opening of the drainage groove is an opening where the drainage groove and the bottom of the drainage groove are opposite each other, and the groove opening of the exhaust groove is an opening where the exhaust groove and the bottom of the exhaust groove are opposite each other. The structure formed by the first groove 122, the second groove 123, and the mounting plate 121 to create a channel is relatively simple and easy to manufacture. In this embodiment, both the first groove 122 and the second groove 123 are welded to the mounting plate 121, and the welding of the first groove 122 and the second groove 123 together results in a stable and reliable structure. Specifically, the second groove 123 is welded to the mounting plate 121 at an angle to achieve an inclined setting of the exhaust channel 3, thereby improving the initiative and smoothness of material discharge within the exhaust channel 3, reducing the need for electronic structures such as pumps, and resulting in a simple and reliable structure.

[0034] Of course, such as Figure 1 and Figure 2As shown, the first groove 122 and the second groove 123 are disposed within the receiving cavity 11. Therefore, the second side plate 13 is provided with a connecting port 131, through which the exhaust groove can communicate with the outside, so that the exhaust channel 3 can communicate with the outside. In addition, the top plate or bottom plate of the box 1 arranged in the vertical direction is also provided with a connecting port 131 communicating with the drainage groove, so as to ensure that the drainage channel 4 is connected to the outside. That is, in addition to the exhaust channel 3 being able to communicate with the outside through the connecting port 131 on the second side plate 13, it can also be connected to the outside through the drainage channel 4 from the connecting port 131 on the top plate or bottom plate of the box 1.

[0035] Furthermore, the number of the first tank group corresponds one-to-one with the number of battery packs 2. The number of first tanks 122 in the first tank group can also correspond one-to-one with the number of battery packs 21 in the battery pack 2, so that the thermal runaway gas of each battery pack 21 has an independent exhaust channel 3 to be discharged, ensuring the exhaust efficiency of each battery pack 21. Of course, the number of first tanks 122 can also be more than the number of battery packs 21 in the battery pack 2, without too much limitation.

[0036] Preferably, the battery energy storage system discharge device further includes a sealing gasket. A sealing gasket should be provided at the connection between the battery pack 21 and the first tank 122 to ensure the sealing of the exhaust channel 3, thereby ensuring the sealing of the receiving cavity 11. At the same time, the first tank 122 extends at least partially outside the connecting port 131, and a sealing gasket is provided between the first tank 122 and the cavity wall of the connecting port 131 to ensure the sealing of the housing.

[0037] Optionally, the pressure relief valve 211 of the battery pack 21 is connected to the side of the first groove 122 away from the mounting plate 121, and the connection position of the pressure relief valve 211 and the first groove 122 is located at the end of the first groove 122 adjacent to the communication port 131. This can effectively shorten the distance between the pressure relief valve 211 of the battery pack 21 and the outside world, so that the gas generated when the battery pack 21 experiences thermal runaway can be promptly ejected through the pressure relief valve 211 into the exhaust channel 3 and discharged to the outside world.

[0038] In addition, an installation gap 14 is formed between two adjacent battery packs 2, and the second groove 123 is set in the installation gap 14, making full use of the internal space of the receiving cavity 11, improving the space utilization of the receiving cavity 11, making the internal structure of the receiving cavity 11 more reasonable, and effectively increasing the capacity of the battery pack 21 of the energy storage system.

[0039] Furthermore, the length of the first groove 122 extends along a third direction (the third direction is the W direction shown in the figure). Along the third direction, at least two adjacent first grooves 122 are stacked, meaning that there is a connection between the exhaust grooves in two adjacent first groove groups, ensuring smooth exhaust of each exhaust groove. This also facilitates the installation of two adjacent first grooves 122 along the third direction, resulting in high alignment accuracy. It should be noted that the first direction, the second direction, and the vertical direction are all set at an angle to the third direction, and the angle between the third direction and the vertical direction is θ.

[0040] In addition to welding the first groove 122, the second groove 123 and the mounting plate 121 together, the first groove 122, the second groove 123 and the mounting plate 121 can also be detachably connected to improve the maintenance convenience of the first side plate 12. It should be noted that when the first groove 122, the second groove 123 and the mounting plate 121 are detachably connected, the connection between each structure must be sealed to prevent thermal runaway gas from leaking into the receiving cavity 11.

[0041] In addition, besides the exhaust channel 3 and drainage channel 4 being formed by the cooperation of the first groove 122, the second groove 123 and the mounting plate 121, the first side plate 12 can also be constructed by directly opening the exhaust channel 3 and drainage channel 4 on a single first side plate 12, resulting in high structural strength.

[0042] like Figure 2 As shown, in other embodiments, the battery energy storage system discharge device further includes multiple support plates 15, which are spaced apart vertically, and the battery pack 21 is disposed on the support plates 15. The support plates 15 enhance the support for the battery pack 21 and prevent displacement or collision damage caused by vibration or impact, thereby improving the installation and structural stability of the battery pack 21.

[0043] Furthermore, the support plate 15 is a liquid-cooled plate, which is connected to an external heat exchange system. The liquid-cooled plate effectively dissipates the heat generated during the charging and discharging process of the battery pack 21, reducing the risk of thermal runaway and extending its service life.

[0044] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery energy storage system exhaust apparatus, comprising: The battery energy storage system exhaust device comprises a box body (1) and a battery pack (2), the box body (1) is provided with a containing cavity (11) inside, the battery pack (2) is arranged in the containing cavity (11), the battery pack (2) comprises a plurality of battery packs (21) arranged in a vertical direction, the box body (1) has a first side plate (12) arranged in a first direction, the first side plate (12) is provided with an exhaust passage group, the exhaust passage group comprises a plurality of exhaust passages (3), a pressure relief valve (211) of each battery pack (21) in the battery pack (2) is respectively communicated with an exhaust passage (3), and each exhaust passage (3) can be communicated with the outside, all the exhaust passages (3) are arranged in the vertical direction, and the length direction of the exhaust passage (3) and the vertical direction form an angle θ, 0° < θ < 180°, θ ≠ 90°, wherein the first direction and the vertical direction are arranged perpendicularly.

2. The battery energy system exhaust of claim 1, wherein, The battery energy storage system exhaust device comprises a plurality of battery packs (2), all the battery packs (2) are arranged in a second direction, and a plurality of exhaust passage groups are arranged on the first side plate (12) corresponding to the plurality of battery packs (2), wherein the first direction, the vertical direction and the second direction are arranged perpendicularly.

3. The battery energy system exhaust of claim 2, wherein, The first side plate (12) is further provided with a drainage passage (4), the drainage passage (4) extends along the vertical direction and penetrates through the two sides of the first side plate (12) along the vertical direction, and the exhaust passages (3) in the adjacent two exhaust passage groups are respectively communicated with the two sides of the drainage passage (4) along the second direction.

4. The battery energy storage system exhaust of claim 3, wherein, The box body (1) has two second side plates (13) arranged in the second direction, the first side plate (12) comprises a mounting plate (121), a plurality of first grooves (122) and a plurality of second grooves (123) arranged on the mounting plate (121), the mounting plate (121) connects the two second side plates (13), a plurality of second grooves (123) are arranged in the second direction, and the length of each second groove (123) extends along the vertical direction, each second groove (123) is provided with a drainage groove, and the mounting plate (121) blocks the groove opening of the drainage groove to form the drainage passage (4), a first groove group is arranged between the second side plate (13) and the second groove (123) and / or between the adjacent two second grooves (123), the first groove group comprises a plurality of first grooves (122) arranged in the vertical direction, each first groove (122) is provided with an exhaust groove, and the mounting plate (121) blocks the groove opening of the exhaust groove to form the exhaust passage (3).

5. The battery energy storage system exhaust of claim 4, wherein, Adjacent two battery packs (2) are spaced apart to form a mounting gap (14), and the second groove (123) is arranged in the mounting gap (14).

6. The battery energy storage system exhaust of claim 4, wherein, The length of the first groove (122) extends along a third direction, and at least part of the adjacent two first grooves (122) are arranged in a stacked manner along the third direction.

7. The battery energy storage system exhaust of claim 4, wherein, The second side plate (13) is provided with a communication port (131), and the exhaust groove can communicate with the outside through the communication port (131).

8. The battery energy system exhaust of claim 7, wherein, The battery energy storage system exhaust device further comprises a sealing gasket, the first groove body (122) extends at least partially outside the communication port (131), and the sealing gasket is arranged between the first groove body (122) and the cavity wall of the communication port (131); and / or, The pressure relief valve (211) of the battery pack (21) is connected to the side of the first groove body (122) away from the mounting plate (121), and the connection position of the pressure relief valve (211) and the first groove body (122) is located at one end of the first groove body (122) adjacent to the communication port (131).

9. The battery energy storage system exhaust of any of claims 1-8, wherein, The battery energy storage system exhaust device further comprises a plurality of supporting plates (15), and the plurality of supporting plates (15) are arranged at intervals along the vertical direction, and the battery pack (21) is arranged on the supporting plates (15).

10. The battery energy system exhaust apparatus of claim 9, wherein, The supporting plate (15) is a liquid cooling plate, and the liquid cooling plate communicates with an external heat exchange system.

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