Energy storage system with rear exhaust

Abstract

The utility model relates to an energy storage system with a rear exhaust part. The energy storage system comprises an exhaust part arranged on a cabinet body; the cabinet body is further provided with a shutter located on the outer side of the exhaust part. A plurality of battery packs are independently arranged in the cabinet body in a layered manner; the battery pack comprises a battery shell; a battery piece is arranged in the battery shell; a connecting flange is arranged on the back of the battery pack; a connecting flange is arranged on the battery shell and is connected with a pressure release valve; the device is reasonable in design, compact in structure and convenient to use.

Description

TECHNICAL FIELD

[0001] The utility model relates to the energy storage system with rear exhaust. BACKGROUND

[0002] Lithium iron phosphate battery is the most widely used battery type in the current energy storage system, and its safety problem has not been completely solved, and fire and explosion accidents often occur.

[0003] In order to solve the fire and explosion accident problems in the lithium iron phosphate battery energy storage system, reduce unnecessary property and personnel losses, the present application provides an energy storage system exhaust structure, which aims to reduce or inhibit the hazards of fire in the energy storage system.

[0004] In addition, in the existing energy storage system, the battery pack pressure relief exhaust design is commonly used, and then the cabinet design active exhaust structure is used. This design will cause the combustible gas to accumulate in the cabinet when thermal runaway occurs, and once the electrical spark in the cabinet is encountered, the fire and explosion accident is extremely easy to occur.

[0005] The thermal runaway of lithium iron phosphate battery is often caused by the thermal runaway of single cell, and then the chain reaction occurs, resulting in thermal runaway fire of the whole battery pack and battery cabin. Therefore, the combustible gas is discharged at the battery pack level, so that the gas of the battery pack thermal runaway is directly discharged to the outside of the cabinet.

[0006] The technical scheme of the utility model mainly solves the problem of combustible gas accumulation in the cabinet when the battery pack thermal runaway, limits the fire of lithium iron phosphate battery in a single battery pack, and achieves the thermal runaway of battery core without spreading to the battery cabinet, orderly exhaust smoke, controllable fire extinguishing, so that the whole system is safe and reliable.

[0007] When the combustible gas overflows, it needs to be identified by a sensor. When the sensor fails, it cannot be quickly identified by manual, especially at night, it is more difficult to identify, and timely alarm.

[0008] When the existing battery pack fails and the combustible gas overflows, it is not easy to identify which battery pack is, and how to facilitate physical identification becomes a technical problem to be solved urgently. Utility model content

[0009] The technical problem to be solved by the utility model is to provide an energy storage system with rear exhaust.

[0010] To solve the above problems, the technical scheme adopted by the utility model is:

[0011] An energy storage system with rear exhaust, comprising an exhaust member arranged on a cabinet;

[0012] The cabinet is also equipped with louvers located on the outside of the exhaust components;

[0013] Several battery packs are independently arranged in layers within the cabinet; each battery pack includes a battery casing; and each battery casing contains battery components.

[0014] A connection flange is provided on the back of the battery pack;

[0015] A connecting flange is provided on the battery casing, and a pressure relief valve is connected to the connecting flange.

[0016] As a further improvement to the above technical solution:

[0017] To improve ventilation, the cabinet is located at the back of the cabinet.

[0018] To achieve constant pressure discharge, the battery casing is connected to the outside through a pressure relief valve and louvers.

[0019] The pressure relief valve includes a valve core.

[0020] The pressure relief valve is set with a pressure threshold.

[0021] This utility model innovatively proposes an independent smoke and exhaust system for the battery pack without significantly increasing battery costs or manufacturing complexity. It differs from other utility models in the following main aspects: the battery pack explosion-proof valve is placed at the rear end, facilitating the exhaust of combustible gases to the outside of the battery pack; the exhaust structure is designed differently from the traditional two-stage pressure relief structure of pack-level pressure relief and cabinet-level pressure relief, creatively allowing combustible gases from a single battery pack to be directly discharged to the outside of the cabinet, preventing secondary accumulation of combustible gases inside the cabinet and preventing fires or even explosions in the entire cabinet.

[0022] This utility model solves the problem of the two-stage pressure relief design of the battery pack and cabinet in traditional fire protection systems, which solves the drawback of flammable gas accumulation in the cabinet and directly exhausts the flammable gas from the battery pack to the outside, thus preventing cabinet fires.

[0023] This invention eliminates the need for cabinet-level fire detectors, fire extinguishers, and active smoke exhaust fans, further optimizing the fire protection structure and improving safety while reducing costs.

[0024] This utility model is reasonably designed, low in cost, sturdy and durable, safe and reliable, simple to operate, time-saving and labor-saving, cost-saving, compact in structure and easy to use. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the cabinet of this utility model.

[0026] Figure 2 This is a schematic diagram of the preferred structure of the pressure relief valve of this utility model.

[0027] Figure 3 It is the pressure relief valve improved structure schematic diagram of the utility model.

[0028] 1, battery piece, 2, battery shell, 3, pressure relief valve, 4, connecting flange, 5, sealing ring A, 6, sealing ring B, 7, louver, 8, exhaust piece, 9, cabinet, 10, battery pack, 11, valve core, 12, external valve stem, 13, support frame, 14, overflow hole, 15, prismatic spur, 16, protective vertical plate, 17, process through-hole, 18, air bag piece, 19, base, 20, spring seat; DETAILED DESCRIPTION

[0029] As Figures 1-3 The utility model mainly aims at providing a good fire-fighting energy storage system, which mainly comprises a battery piece 1, a battery shell 2, a pressure relief valve 3, a connecting flange 4, a sealing ring A 5, a sealing ring B 6, a louver 7 and the like.

[0030] The connecting flange 4 is arranged between the pressure relief valve 3 and the battery shell 2 and is fixed by bolts. The sealing ring A 5 mainly realizes the sealing between the inside and outside of the cabinet, so as to prevent rainwater from entering the cabinet. The sealing ring B 6 mainly realizes the sealing between the louver 7 and the cabinet 9, so as to prevent rainwater from entering the cabinet 9. The whole structure can reach the IP04 waterproof level and meet the outdoor use requirements.

[0031] As Figure 1 There are five layers of battery packs 10 in the cabinet, and each battery pack 10 is provided with an exhaust piece 8 at the rear portion, and the exhaust pieces 8 are independent of each other. The smoke generated by thermal runaway of each battery pack 10 can be discharged to the outside of the cabinet 9 through the exhaust piece 8, so as to reduce the influence of the accumulation of flammable gas in the cabinet 9.

[0032] Specifically Figures 1-3 The exhaust assembly comprises the exhaust piece 8 arranged on the back of the cabinet 9, and the louver 7 arranged on the cabinet 9 and located outside the exhaust piece 8.

[0033] The battery packs 10 are independently arranged in layers in the cabinet 9. The battery pack 10 comprises the battery shell 2, and the battery piece 1 is arranged in the battery shell 2.

[0034] The connecting flange 4 is arranged on the back of the battery pack 10.

[0035] The connecting flange 4 is arranged on the battery shell 2, and the pressure relief valve 3 is connected to the connecting flange 4.

[0036] In Figure 2In this structure, a pressure relief valve 3 with a spring is directly installed. Specifically, the pressure relief valve 3 includes a valve core 11 connected to a spring for automatic reset to achieve back pressure. When thermal runaway occurs in the battery cell, flammable gas accumulates inside the battery casing 2, increasing the internal pressure. When the internal pressure rises to a certain value, the pressure relief valve 3 opens under the action of the spring, allowing the flammable gas to enter the connecting flange 4 and then be discharged through the louver 7.

[0037] In Example 2, a spring generates back pressure for venting. However, the pressure relief valve 3 only opens when the internal pressure becomes excessive, and automatically closes when the pressure decreases. This prevents prolonged venting and pressure relief, which can easily lead to misjudgments. When high pressure causes the pressure relief valve 3 to open, the internal pressure decreases, but at this point, the battery may be damaged due to low temperature and cannot release gas. Furthermore, it is not possible to visually identify which part of the battery pack is damaged. Additionally, the spring back pressure fails to fully utilize this potential energy.

[0038] exist Figure 3 Therefore, the pressure relief valve is further improved by adjusting the spring pressure or omitting the back pressure spring. The pressure relief valve 3 includes a valve core 11, which may or may not be connected to a spring.

[0039] An external valve stem 12 is connected to the outer end of the valve core 11, and a support frame 13 with several overflow holes 14 is provided at the end of the external valve stem 12; several prismatic protrusions 15 are provided on the support frame 13.

[0040] A bracket is provided on the back of the louver 7, and a protective upright plate 16 with several process through holes 17 is provided on the bracket; an airbag component 18 is provided in the bracket; the airbag component 18 is inflated with a non-flammable warning gas with an irritating odor, the warning gas can be a common gas such as trimethylamine, preferably a colored gas; it can be mixed with a small amount of bromine Br2, sulfur dioxide SO2 and nitrogen dioxide NO2, etc.

[0041] A base 19 is provided on the support frame 13, and a spring seat 20 is movably provided at the end of the base 19; the spring seat 20 presses onto the airbag component 18 after passing through the process through hole 17.

[0042] When the internal pressure exceeds the set value, the valve core 11 pushes the external valve stem 12 forward, causing the spring seat 20 to continue pressing on the airbag component 18. Simultaneously, the prismatic protrusion 15 pierces the airbag component 18 after passing through the process through hole 17, causing the airbag component 18 to release warning gas. As the gas is released, the pressure in the airbag component 18 decreases, allowing the spring force of the spring seat 20 to be fully released, while continuing to pressurize the airbag component 18, resulting in a complete and rapid release of the warning gas, thus achieving a physical alarm. At the same time, the valve core 11 does not reset, allowing the combustible gas in the internal cavity to be fully discharged into the atmosphere, diluting the combustible gas within the internal cavity and thus solving the problem.Figure 2 The pressure relief valve of the application can continuously discharge combustible gas, and when the later maintenance is carried out, the corresponding battery with fault can be determined by observing which air bag is punctured.

[0043] The explosion-proof valve of the battery pack is placed at the rear end, which is beneficial to discharge the combustible flue gas to the outside of the battery pack,

[0044] The utility model discloses an exhaust structure, unlike the two-stage pressure relief structure of traditional pack level pressure relief-cabinet pressure relief, the combustible gas of single battery pack is directly discharged to the outside of the cabinet, and the secondary accumulation of combustible gas in the cabinet is avoided, and the fire or explosion of the whole cabinet is prevented.

[0045] The utility model fully describes in order to more clearly disclose, and for prior art will not enumerate one by one.

[0046] Finally, it should be pointed out that: the above examples are only used to illustrate the technical scheme of the utility model, and are not limited thereto; although the utility model has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical scheme recorded in the foregoing examples, or make equivalent replacement to part of the technical features; as the person skilled in the art combines the plurality of technical schemes of the utility model, it is obvious; these modifications or replacements do not make the essence of the corresponding technical scheme deviate from the spirit and scope of the technical scheme of the utility model example. The technical content not described in the utility model is known technology.

Claims

1. An energy storage system with post exhaust, characterized by: The exhaust member (8) is arranged on the cabinet (9); The shutter (7) is arranged on the cabinet (9) outside the exhaust member (8); The battery pack (10) is arranged in the cabinet (9) in layers and independently. The battery pack (10) comprises a battery shell (2). The battery shell (2) is connected with the pressure relief valve (3).

2. The energy storage system with post exhaust of claim 1, wherein: The cabinet (9) is arranged on the back of the cabinet (9).

3. The energy storage system with post exhaust of claim 1, wherein: The battery shell (2) is connected with the pressure relief valve (3) and the shutter (7) to communicate with the outside.

4. The energy storage system with after-positioned exhaust according to claim 1, characterized by: The pressure relief valve (3) comprises a valve core (11).

5. The energy storage system with post exhaust of claim 1, wherein: The pressure relief valve (3) is set with a pressure threshold.

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