Energy storage battery module box cover with pressure relief function and energy storage battery module

Abstract

The embodiment of the utility model provides an energy storage battery module box cover with a pressure relief function and an energy storage battery module, the box cover comprises a box cover body and a pressure relief structure, the pressure relief structure is arranged on the box cover body, and the pressure relief structure and the box cover body are integrally formed; the thickness of the pressure relief structure is smaller than that of the box cover body; when thermal runaway occurs in the energy storage battery module, the pressure relief structure is broken under the action of preset high pressure, so that the box cover body is communicated with the external environment for pressure relief. According to the energy storage battery module box cover disclosed by the embodiment of the invention, the box cover body is provided with the pressure relief structure integrally formed with the box cover body, the thickness of the pressure relief structure is smaller than that of the box cover body, and when thermal runaway occurs in the energy storage battery module, the pressure relief structure with the small thickness is broken under the action of the preset high pressure to relieve pressure; an extra pressure relief structure does not need to be installed on the box cover, the structure is simple, and on the premise that thermal runaway of products is solved in time, the product cost is reduced, and the product space is reasonably utilized.

Description

Technical Field

[0001] The disclosed embodiments belong to the technical field of energy storage battery module boxes, and specifically relate to an energy storage battery module box cover with a pressure relief function and an energy storage battery module. Background Art

[0002] With the rapid development of the energy storage industry and the safety accident warnings that have occurred during the development of the industry, the energy storage system has stricter requirements on the response time and fire extinguishing effect of the fire protection system. In the current air-cooled solution of the energy storage system, the protection level of the PACK box is IP20. When the fire protection system is started, the fire-fighting agent can quickly act on the thermal runaway fault point. However, with the industry's improvement in the performance of energy storage systems, the air-cooled solution has been gradually eliminated, and liquid-cooled energy storage has become the preferred choice. However, in order to ensure the safe operation of the product and prevent coolant or condensed water from entering the PACK box, the protection level of the liquid-cooled PACK box has reached IP67. In order to prevent explosion after the product has thermal runaway, a mechanical pressure relief valve must be installed. Because the mechanical pressure relief valve requires a certain opening pressure inside the PAKC to open, and closes when it is lower than the opening pressure, this principle will inevitably isolate the fire-fighting agent in the cabin outside the PACK box, and it cannot cover the thermal runaway area in time.

[0003] The existing solution is to use a PACK-level fire-fighting solution, which requires the fire-fighting agent to be transported to the PACK at a fixed point through a pipeline. At the same time, it requires supporting structures such as fire detection sensors, fire sprinklers, and mechanical puncture valves, which leads to a significant increase in product costs and compact installation layout space.

[0004] In view of the above problems, it is necessary to propose an energy storage battery module box cover and an energy storage battery module with a pressure relief function that are reasonably designed and can effectively improve the above problems. Utility Model Content

[0005] The embodiments of the present disclosure aim to solve at least one of the technical problems existing in the prior art and provide an energy storage battery module cover and an energy storage battery module with a pressure relief function.

[0006] One aspect of an embodiment of the present disclosure provides an energy storage battery module box cover with a pressure relief function, comprising:

[0007] Box cover body;

[0008] A pressure relief structure, which is arranged on the box cover body and is formed integrally with the box cover body;

[0009] The thickness of the pressure relief structure is smaller than the thickness of the box cover body; wherein,

[0010] When thermal runaway occurs inside the energy storage battery module, the pressure relief structure ruptures under the action of a preset high pressure, so that the box cover body is connected to the external environment for pressure relief.

[0011] Optionally, the pressure relief structure includes a pressure relief body, a first rupture groove and a second rupture groove;

[0012] The first rupture groove is arranged around the outer side of the pressure relief body;

[0013] The second rupture groove is arranged on the pressure relief body and is connected to the first rupture groove; wherein,

[0014] The thickness of the first rupture groove is greater than the thickness of the second rupture groove.

[0015] Optionally, the thickness of the first rupture groove is less than the thickness of the box cover body×60%.

[0016] Optionally, the thickness of the second rupture groove is less than the thickness of the first rupture groove×60%.

[0017] Optionally, there are multiple second rupture grooves.

[0018] Optionally, a plurality of the second rupture grooves are cross-distributed on the pressure relief body.

[0019] Optionally, there are multiple pressure relief structures.

[0020] Optionally, a plurality of the pressure relief structures are distributed at equal intervals.

[0021] Optionally, the box cover body and the pressure relief structure may be made of plastic material, metal material or non-metal material.

[0022] Another aspect of the embodiments of the present disclosure provides an energy storage battery module, which adopts the energy storage battery module box cover with pressure relief function as described above.

[0023] The energy storage battery module case cover and energy storage battery module with pressure relief function of the disclosed embodiment, the case cover includes a case cover body and a pressure relief structure, the pressure relief structure is arranged on the case cover body and is formed integrally with the case cover body; the thickness of the pressure relief structure is less than the thickness of the case cover body; wherein, when thermal runaway occurs inside the energy storage battery module, the pressure relief structure ruptures under the action of a preset high pressure, so that the case cover body is connected to the external environment for pressure relief. The energy storage battery module case cover of the disclosed embodiment, the case cover body is provided with a pressure relief structure formed integrally therewith, the thickness of the pressure relief structure is less than the thickness of the case cover body, when thermal runaway occurs inside the energy storage battery module, the pressure relief structure with a small thickness ruptures under the action of a preset high pressure for pressure relief, and there is no need to install an additional pressure relief structure on the case cover, the structure is simple, and the product cost is reduced and the product space is reasonably utilized while timely solving the thermal runaway of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural schematic diagram of an energy storage battery module box cover with a pressure relief function according to an embodiment of the present disclosure;

[0025] Figure 2 It is a front view of an energy storage battery module box cover with a pressure relief function according to another embodiment of the disclosed embodiments;

[0026] Figure 3 This is a structural schematic diagram of a pressure relief structure of another embodiment of the disclosed embodiment;

[0027] Figure 4 It is a depth schematic diagram of the box cover body and the pressure relief structure of another embodiment of the disclosed embodiment. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solutions of the embodiments of the present disclosure, the embodiments of the present disclosure are further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0029] like Figure 1 and Figure 2 As shown, one aspect of an embodiment of the present disclosure provides an energy storage battery module box cover 100 with a pressure relief function, including a box cover body 110 and a pressure relief structure 120 .

[0030] The pressure relief structure 120 is disposed on the box cover body 110 and is integrally formed with the box cover body 110 .

[0031] The thickness of the pressure relief structure 120 is smaller than that of the box cover body 110. When thermal runaway occurs inside the energy storage battery module, the pressure relief structure 120 ruptures under the action of a preset high pressure, so that the box cover body 110 is connected to the external environment for pressure relief.

[0032] Specifically, when thermal runaway occurs inside the energy storage battery module, the pressure relief structure 120 on the box cover body 110 will rupture under the action of the preset high pressure inside the energy storage battery module, so that the box cover body 110 is connected to the external environment, and the abnormal gas released is detected by the fire protection system, which starts the fire protection system. The fire protection agent can be sprayed and diffused into the abnormal energy storage battery module, thereby promptly eliminating the open flame caused by the thermal runaway.

[0033] The energy storage battery module box cover with a pressure relief function in the disclosed embodiment is provided with a box cover body having a pressure relief structure integrally formed therewith, and the thickness of the pressure relief structure is less than the thickness of the box cover body. When thermal runaway occurs inside the energy storage battery module, the pressure relief structure with a small thickness ruptures under the action of a preset high pressure to relieve pressure, and there is no need to install an additional pressure relief structure on the box cover. The structure is simple, and while timely resolving the thermal runaway of the product, the product cost is reduced and the product space is reasonably utilized.

[0034] For example, Figure 3 As shown, the pressure relief structure 120 includes a pressure relief body 121, a first rupture groove 122, and a second rupture groove 123. The first rupture groove 122 is arranged around the outside of the pressure relief body 121. The second rupture groove 123 is arranged in the pressure relief body 121 and connected to the first rupture groove 122. The thickness of the first rupture groove 122 is greater than the thickness of the second rupture groove 123. Specifically, the thickness of the box cover body 110 is greater than the thickness of the first rupture groove 122, and the thickness of the first rupture groove 122 is greater than the thickness of the second rupture groove 123.

[0035] In this embodiment, the thickness of the first rupture groove arranged on the outside of the pressure relief body is greater than the thickness of the second rupture groove located on the pressure relief body, ensuring that when the design pressure is reached in the energy storage battery module box, the second rupture groove is destroyed first to reduce the pressure in the energy storage battery module box, and the first rupture groove is not damaged, which can prevent the pressure relief structure fragments from flying out and causing other damages.

[0036] Exemplarily, the thickness of the first rupture groove is less than the thickness of the box cover body×60%.

[0037] Specifically, Figure 4 Schematic diagram of the depth of each part of the box cover, T is the wall thickness of the box cover body 110, T1 is the depth of the first rupture groove 122 in the pressure relief structure 120 (i.e. T-T1 is the thickness of the first rupture groove 122), T2 is the depth of the second rupture groove 123 (i.e. T-T2 is the thickness of the second rupture groove 123). In order to ensure the area connected to the outside after pressure relief, T-T1<T*60%.

[0038] In this embodiment, when thermal runaway occurs inside the energy storage battery module, in order to ensure the communication area between the pressure relief structure and the outside after pressure relief, the thickness of the first rupture groove is set to be less than 60% of the thickness of the box cover body.

[0039] Exemplarily, the thickness of the second rupture groove 123 is less than the thickness of the first rupture groove 122×60%. Figure 4 As shown, T-T2<(T-T1)*60%.

[0040] In this embodiment, in order to ensure the pressure relief effect of the pressure relief structure and prevent the fragments of the pressure relief structure from flying out, the thickness of the second rupture groove is set to be less than 60% of the thickness of the first rupture groove.

[0041] It should be noted that the maximum pressure value that the pressure relief structure 120 can withstand may be related to factors such as product material performance, the cross-sectional area of ​​the first rupture groove 122 and the second rupture groove 123, and the design and adjustment of the explosion relief pressure can be based on specific requirements.

[0042] For example, Figure 2As shown, there are multiple second rupture grooves 123 , wherein the multiple second rupture grooves 123 are cross-distributed on the pressure relief body 121 .

[0043] Specifically, Figure 3 As shown, in this embodiment, the pressure relief structure 120 is circular in shape, and accordingly, the first rupture groove 122 surrounds the outer side of the circular pressure relief body 121, and the shape of the first rupture groove 122 is also circular. In this embodiment, the number of the second rupture grooves 123 is four, and the four second rupture grooves 123 are cross-distributed in the pressure relief body 121 in a "M" shape. Among them, both ends of each second rupture groove 123 are connected to the first rupture groove 122.

[0044] It should be noted that the shape of the pressure relief structure 120 is not limited to the circle of this embodiment, but may be other shapes, such as square, triangle, ellipse, etc., which can be selected according to actual needs and is not specifically limited in this embodiment.

[0045] Exemplarily, there are multiple pressure relief structures 120. Specifically, to ensure rapid pressure relief of the tank cover and facilitate rapid coverage of the thermal runaway area by the fire fighting agent, multiple pressure relief structures 120 may be designed at different positions of the tank cover.

[0046] The plurality of pressure relief structures 120 are distributed at equal intervals. Of course, the plurality of pressure relief structures 120 may also be distributed at non-equal intervals, and the distribution of the plurality of pressure relief structures 120 may be performed according to actual needs.

[0047] It should be noted that, in this embodiment, the number, size and distribution position of the pressure relief structure 120 are not specifically limited and can be selected according to actual needs.

[0048] Exemplarily, the material of the box cover body 110 and the pressure relief structure 120 can be plastic material, metal material or non-metal material. The material of the box cover body 110 and the pressure relief structure 120 is not specifically limited in this embodiment and can be selected according to actual needs. Preferably, the material of the box cover body 110 and the pressure relief structure 120 is plastic. When thermal runaway occurs inside the energy storage battery module, the pressure relief structure 120 is more likely to rupture and release pressure.

[0049] Another aspect of the disclosed embodiment provides an energy storage battery module, including the energy storage battery module cover 100 with pressure relief function as described above. The specific structure of the energy storage battery module cover 100 with pressure relief function has been described in detail above and will not be repeated here.

[0050] The energy storage battery module of the disclosed embodiment adopts an energy storage battery module box cover with a pressure relief function. When thermal runaway occurs inside the energy storage battery module, the pressure relief structure ruptures under the action of a preset high pressure, so that the box cover body is connected to the external environment for pressure relief. There is no need to install an additional pressure relief structure on the box cover. The structure is simple, and while timely resolving the thermal runaway of the product, it reduces product costs and reasonably utilizes product space.

[0051] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the embodiments of the present disclosure, but the embodiments of the present disclosure are not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the embodiments of the present disclosure, and these modifications and improvements are also considered to be within the protection scope of the embodiments of the present disclosure.

Claims

1. A battery module box cover with a pressure relief function, characterized in that: include: Box cover body; A pressure relief structure, which is arranged on the box cover body and is formed integrally with the box cover body; The thickness of the pressure relief structure is smaller than the thickness of the box cover body; wherein, When thermal runaway occurs inside the energy storage battery module, the pressure relief structure ruptures under the action of a preset high pressure, so that the box cover body is connected to the external environment for pressure relief.

2. The energy storage battery module box cover with pressure relief function according to claim 1, characterized in that: The pressure relief structure includes a pressure relief body, a first rupture groove and a second rupture groove; The first rupture groove is arranged around the outer side of the pressure relief body; The second rupture groove is arranged on the pressure relief body and is connected to the first rupture groove; wherein, The thickness of the first rupture groove is greater than the thickness of the second rupture groove.

3. The energy storage battery module box cover with pressure relief function according to claim 2 is characterized in that: The thickness of the first rupture groove is less than the thickness of the box cover body×60%.

4. The energy storage battery module box cover with pressure relief function according to claim 2, characterized in that: The thickness of the second rupture groove is less than the thickness of the first rupture groove×60%.

5. The energy storage battery module box cover with pressure relief function according to claim 2, characterized in that: The number of the second rupture grooves is plural.

6. The energy storage battery module box cover with pressure relief function according to claim 5, characterized in that: A plurality of the second rupture grooves are cross-distributed on the pressure relief body.

7. The energy storage battery module box cover with pressure relief function according to any one of claims 1 to 6, characterized in that: The number of the pressure relief structures is multiple.

8. The energy storage battery module box cover with pressure relief function according to claim 7, characterized in that: The plurality of pressure relief structures are distributed at equal intervals.

9. The energy storage battery module box cover with pressure relief function according to any one of claims 1 to 6, characterized in that: The box cover body and the pressure relief structure may be made of plastic material, metal material or non-metal material.

10. An energy storage battery module, characterized in that: An energy storage battery module box cover with a pressure relief function comprising any one of claims 1 to 9.

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