Energy storage container

Abstract

The utility model provides an energy storage container, and relates to the technical field of energy storage. The energy storage container comprises a container body and a plurality of battery clusters, each battery cluster comprises a supporting frame and a plurality of battery packs, the battery packs are sequentially arranged on the supporting frames in the vertical direction, the battery clusters are arranged in the container body in a two-row arrangement mode, and a shell of each battery pack is provided with four side walls which are continuously arranged end to end; wherein three side walls facing the adjacent battery clusters are first side walls, and the other side wall is a second side wall; an intumescent fireproof coating is arranged on the surface of a shell of the battery pack and at least covers the three first side walls; positive and negative electrodes, an electrical control line and an anti-explosion valve are further arranged on the battery pack, the positive and negative electrodes, the electrical control line and the anti-explosion valve are all located on the second side wall, the expansion type fireproof coating expands when heated so as to shrink an airflow channel formed between the expansion type fireproof coating and other adjacent battery clusters, and the situation that other adjacent battery clusters are affected by high temperature generated by the battery pack is avoided; and the purpose of blocking heat spreading is achieved.

Description

Technical Field

[0001] The present application relates to an energy storage container, and belongs to the technical field of energy storage. Background Art

[0002] Currently, in order to increase the capacity and energy density of energy storage power stations, multiple battery clusters are often installed closely together and contained in an energy storage container. When one of the battery clusters experiences thermal runaway, it is easy to ignite the remaining battery clusters or other components in the container, causing great harm. Utility Model Content

[0003] The present application provides an energy storage container, which solves the problem in the related art that thermal runaway of some battery clusters in an energy storage power station may ignite other battery clusters and parts.

[0004] The present application provides an energy storage container, comprising:

[0005] A container body and a plurality of battery clusters, each of the battery clusters comprises a support frame and a plurality of battery packs, the battery packs are arranged on the support frame in sequence along a vertical direction, the battery clusters are arranged in two rows in the container body, the shell of the battery pack has four side walls arranged end to end, three of the side walls facing the adjacent battery clusters are first side walls, and the other side wall is a second side wall;

[0006] An intumescent fire-retardant coating is provided on the shell surface of the battery pack, and the intumescent fire-retardant coating covers at least three of the first side walls; positive and negative electrodes, electrical control lines and explosion-proof valves are also provided on the battery pack, and the positive and negative electrodes, the electrical control lines and the explosion-proof valve are all located on the second side wall.

[0007] In some embodiments, the intumescent fire retardant coating is also disposed on the top surface of the shell of the battery pack and / or on the bottom surface of the shell of the battery pack.

[0008] In some embodiments, the intumescent fire retardant coating is also disposed on the surface of the second side wall, and the intumescent fire retardant coating is disposed at a position on the surface of the second side wall that avoids the positive and negative electrodes, the electrical control wires and the explosion-proof valve.

[0009] In some embodiments, the energy storage container further includes a plurality of spray ports, each of which corresponds to each of the battery packs one by one, and each of the spray ports is arranged toward the explosion-proof valve.

[0010] In some embodiments, the energy storage container further includes a spray pipe extending in a vertical direction, wherein the spray pipe is disposed between the wall of the container body and the battery cluster, the spray pipe is fixed to the wall surface of the container body, and a plurality of the spray ports are sequentially disposed on the spray pipe.

[0011] In some embodiments, the energy storage container further includes a battery management system, which is capable of detecting the state of the battery cluster, and the battery management system is electrically connected to a water valve connected to the spray port.

[0012] In some embodiments, the shell of the battery pack includes an upper shell and a lower shell, the upper shell and the lower shell are combined and connected to each other in a vertical direction, the four side walls are formed on the upper shell, and the intumescent fire retardant coating is arranged on the outer surface of the entire upper shell.

[0013] In some embodiments, the battery pack is connected to the support frame through the lower shell.

[0014] In some embodiments, the coating thickness of the intumescent fire retardant coating is set to be able to contact the surface of the adjacent battery cluster when the intumescent fire retardant coating expands due to heat.

[0015] In some embodiments, the intumescent fire retardant coating is formed by a spraying process.

[0016] In the energy storage container provided in the present application, an intumescent fire-retardant coating is arranged on the surface of the first side wall of the battery pack facing other adjacent battery clusters. When thermal runaway occurs in the battery pack, the intumescent fire-retardant coating expands due to the heat to reduce the airflow path formed between the battery pack and other adjacent battery clusters, thereby preventing the high temperature generated by the battery pack from affecting other adjacent battery clusters.

[0017] At the same time, the positive and negative electrodes, electrical control lines and explosion-proof valves on the battery pack are arranged on the surface of the second side wall different from the first side wall to prevent the intumescent fire-retardant coating from expanding due to heat and squeezing the positive and negative electrodes, electrical control lines and explosion-proof valves, resulting in the positive and negative electrodes, electrical control lines and explosion-proof valves not being able to work normally, thereby further worsening the thermal runaway of the battery pack. In addition, the explosion-proof valve is not arranged toward other battery clusters to prevent the discharged high-temperature gas from affecting other adjacent battery clusters. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and other purposes, features and advantages of the embodiments of the present application will become more easily understood through the following detailed description with reference to the accompanying drawings. In the accompanying drawings, multiple embodiments of the present application will be described in an exemplary and non-limiting manner, wherein:

[0019] Figure 1 This is a schematic structural diagram of an energy storage container according to an embodiment of the utility model, wherein the wall of the container body is hidden;

[0020] Figure 2 for Figure 1 A partial enlarged view of part A;

[0021] Figure 3 This is a schematic diagram of the internal layout of an energy storage container according to an embodiment of the utility model;

[0022] Figure 4 A schematic diagram of the structure of a battery pack according to an embodiment of the utility model;

[0023] Figure 5 This is a side view structural diagram of an energy storage container according to an embodiment of the utility model, wherein the wall of the container body is hidden;

[0024] Figure 6 The figure is a schematic diagram of the positional relationship among the battery cluster, the spray pipe and the spray port according to an embodiment of the present utility model.

[0025] Reference numerals:

[0026] 100-Energy Storage Container,

[0027] 10- container body, 101- container wall,

[0028] 20-battery cluster,

[0029] 1- Support frame,

[0030] 2-battery pack, 21-shell, 211-upper shell, 212-lower shell, 21a-first side wall, 21b-second side wall, 201-positive electrode, 202-negative electrode, 203-explosion-proof valve,

[0031] 3-spray pipe, 31-spray port,

[0032] 4- Airflow path. DETAILED DESCRIPTION

[0033] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0034] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0036] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0039] Currently, in order to increase the capacity and energy density of energy storage power stations, multiple battery clusters are often installed closely together and contained in an energy storage container. When one of the battery clusters experiences thermal runaway, it is easy to ignite the remaining battery clusters or other components in the container, causing great harm.

[0040] In the energy storage container proposed in the present application, an intumescent fire retardant coating is arranged on the surface of the first side wall of the battery pack facing other adjacent battery clusters. When thermal runaway occurs in the battery pack, the intumescent fire retardant coating expands due to heat to reduce the airflow path formed between the battery pack and other adjacent battery clusters, thereby preventing the high temperature generated by the battery pack from affecting other adjacent battery clusters.

[0041] At the same time, the positive and negative electrodes, electrical control lines and explosion-proof valves on the battery pack are arranged on the surface of the second side wall different from the first side wall to prevent the intumescent fire-retardant coating from expanding due to heat and squeezing the positive and negative electrodes, electrical control lines and explosion-proof valves, resulting in the positive and negative electrodes, electrical control lines and explosion-proof valves not being able to work normally, thereby further worsening the thermal runaway of the battery pack. In addition, the explosion-proof valve is not arranged toward other battery clusters to prevent the discharged high-temperature gas from affecting other adjacent battery clusters.

[0042] The energy storage container provided in this application is described in detail below in conjunction with specific embodiments.

[0043] like Figure 1 As shown, the present application provides an energy storage container 100, which includes a container body 10 and a plurality of battery clusters 20, wherein Figure 2 As shown, a single battery cluster 20 specifically includes a support frame 1 and a plurality of battery packs 2. The battery packs 2 are sequentially arranged on the support frame 1 along the vertical direction. The support frame 1 is fixed in the container body 10 to achieve a reliable connection between the battery cluster 20 and the container body 10.

[0044] Specifically, Figure 3 As shown, these battery clusters 20 are arranged in two rows in the container body 10. For the battery packs 2 in each battery cluster 20, as shown in FIG. Figure 3 and Figure 4 As shown, the shell 21 of the battery pack 2 has four side walls arranged end to end, of which three side walls are first side walls 21a, facing the adjacent battery clusters 20 respectively, and the remaining other side wall is the second side wall 21b. In this solution, an intumescent fire retardant coating is provided on the surface of the shell 21 of the battery pack 2, and the intumescent fire retardant coating covers the three first side walls 21a. At the same time, the battery pack 2 is also provided with components such as a positive electrode 201, a negative electrode 202, an electrical control line (not shown in the figure) and an explosion-proof valve 203, all of which are located on the second side wall 21b.

[0045] By arranging an intumescent fire-retardant coating on the surface of the first side wall 21a of the battery pack 2 facing other adjacent battery clusters 20, when thermal runaway occurs in the battery pack 2, the intumescent fire-retardant coating is heated and expands toward the surrounding side surface of the battery cluster 20, so as to reduce the airflow path 4 formed between the other adjacent battery clusters 20, thereby preventing the high temperature generated by the battery pack 2 from affecting the other adjacent battery clusters 20, thereby achieving the purpose of blocking heat spread.

[0046] At the same time, the positive and negative electrodes, electrical control lines and explosion-proof valve 203 on the battery pack 2 are arranged on the surface of the second side wall 21b which is different from the first side wall 21a, so as to prevent the intumescent fire-retardant coating from expanding due to heat and squeezing the positive and negative electrodes, the electrical control lines and the explosion-proof valve 203, causing the positive and negative electrodes, the electrical control lines and the explosion-proof valve 203 to fail to work normally and further worsen the thermal runaway of the battery pack 2. In addition, the explosion-proof valve 203 is not arranged toward other battery clusters 20 to prevent the discharged high-temperature gas from affecting other adjacent battery clusters 20.

[0047] Among them, the intumescent fire-retardant coating provided on the surface of the battery pack 2 shell 21 can expand and foam when heated to form a carbon foam insulation layer to cover the battery pack 2 shell 21, delay the transfer of heat to the substrate, prevent the object from catching fire or the strength decrease caused by the temperature increase. At the same time, the expanded and foamed intumescent fire-retardant coating reduces the airflow path 4 formed between other adjacent battery clusters 20, achieving the purpose of blocking heat spread. Among them, the principle of the expansion of the intumescent fire-retardant coating when heated belongs to the scope of the prior art and will not be repeated here.

[0048] Of course, in other embodiments, in order to further increase the coverage area of ​​the intumescent fire retardant coating on the surface of the battery pack 2, the intumescent fire retardant coating can also be arranged on the surface of the second side wall 21b to increase the coverage area of ​​the intumescent fire retardant coating on the battery pack 2, thereby improving the heat insulation effect after thermal expansion. When the intumescent fire retardant coating is arranged on the surface of the second side wall 21b, the setting position of the intumescent fire retardant coating on the surface of the second side wall 21b should avoid components such as the positive electrode 201, the negative electrode 202, the electrical control line and the explosion-proof valve 203, so as to avoid the intumescent fire retardant coating from expanding due to heat and squeezing the positive and negative electrodes, the electrical control line and the explosion-proof valve 203, resulting in the positive and negative electrodes, the electrical control line and the explosion-proof valve 203 not being able to work normally. Specifically, taking the explosion-proof valve 203 located on the surface of the second side wall 21b as an example, if it is necessary to set an intumescent fire-retardant coating around the explosion-proof valve 203, a sufficient distance should be left between the intumescent fire-retardant coating and the explosion-proof valve 203, so that the intumescent fire-retardant coating will not occupy the exhaust space of the explosion-proof valve 203 after being heated and expanded, so as to avoid affecting the normal operation of the explosion-proof valve 203. Among them, the specific distance that should be left between the intumescent fire-retardant coating and the explosion-proof valve 203 can be calculated based on the expansion coefficient of the intumescent fire-retardant coating used. Since various intumescent fire-retardant coatings in the prior art have different expansion coefficients, the actual distance that can be set will not be specifically described here.

[0049] Furthermore, in order to increase the coverage area of ​​the intumescent fire retardant coating on the surface of the battery pack 2, the intumescent fire retardant coating can also be provided on the top surface of the shell 21 of the battery pack 2 and the bottom surface of the shell 21. By also providing the intumescent fire retardant coating on the top surface and the bottom surface of the shell 21 of the battery pack 2, the intumescent fire retardant coating can be expanded by heat to achieve isolation between the upper and lower adjacent battery packs 2 in the same battery cluster 20, so as to prevent high temperature from spreading between different battery packs 2 in the same battery cluster 20.

[0050] like Figure 4 As shown, in this embodiment, the shell 21 of the battery pack 2 includes an upper shell 211 and a lower shell 212, which are combined with each other in the vertical direction and fixedly connected by a connecting flange, and the above-mentioned four side walls (three first side walls 21a and one second side wall 21b) are all formed on the upper shell 211, and the intumescent fire retardant coating is arranged on the outer surface of the entire upper shell 211. Compared with arranging the intumescent fire retardant coating on a local area of ​​the upper shell 211 or the lower shell 212, it is easier to implement to arrange the intumescent fire retardant coating on the outer surface of the entire upper shell 211, or the outer surface of the entire lower shell 212.

[0051] In the case where the intumescent fire retardant coating is provided on the outer surface of the entire upper shell 211, the battery pack 2 is connected to the support frame 1 through the lower shell 212. Therefore, the upper shell 211 is used to provide the intumescent fire retardant coating to isolate the air passage 4 by thermal expansion, and the lower shell 212 is used to achieve connection with the support frame 1, thereby avoiding thermal expansion at the connection between the battery pack 2 and the support frame 1, which is more conducive to the disposal of the battery pack 2 in the event of thermal runaway.

[0052] Of course, in other embodiments, the above-mentioned four side walls may also be formed on the lower shell 212 . In this case, the intumescent fire retardant coating is provided on the outer surface of the entire lower shell 212 .

[0053] On this basis, the intumescent fire retardant coating in this embodiment is formed on the surface of the upper shell 211 by a spraying process. Compared with other processes for forming the intumescent fire retardant coating, the spraying process is relatively easy to implement and convenient for controlling the coating thickness.

[0054] By effectively controlling the coating thickness of the intumescent fire retardant coating, the expansion size of the intumescent fire retardant coating after thermal expansion can be controlled. More preferably, the coating thickness of the intumescent fire retardant coating provided on the surface of the battery pack 2 should meet the following conditions: the intumescent fire retardant coating can be in contact with the surface of other battery clusters 20 adjacent to the battery pack 2 when thermally expanded. By enabling the intumescent fire retardant coating to be in contact with the surface of the adjacent battery cluster 20 after thermal expansion, the airflow path 4 between the adjacent other battery clusters 20 is completely cut off to prevent the high temperature generated by the battery pack 2 from affecting the adjacent other battery clusters 20. Specifically, the expansion size of the intumescent fire retardant coating after thermal expansion is affected by the expansion coefficient of the coating and the actual thickness of the coating. By selecting a coating with a specific expansion coefficient and spraying a coating of sufficient thickness on the surface of the battery pack 2, the formed intumescent fire retardant coating can be in contact with the surface of the adjacent battery cluster 20 after thermal expansion.

[0055] like Figure 5 and Figure 6 As shown, in this embodiment, the energy storage container 100 also includes spray pipes 3 extending in the vertical direction. These spray pipes 3 are arranged between the box wall 101 of the container body 10 and the battery cluster 20. The spray pipes 3 are fixed to the surface of the box wall 101 of the container body 10. Along the vertical direction, a plurality of spray ports 31 are sequentially arranged on the spray pipes 3. These spray ports 31 are arranged one by one corresponding to the battery packs 2 on the battery cluster 20, and the spray ports 31 are arranged toward the explosion-proof valve 203.

[0056] When a spray port 31 is provided on the battery cluster 20 to extinguish the fire of the battery cluster 20 that has thermal runaway, the fire-retardant coating that expands due to heat can separate the battery cluster 20 from other adjacent battery clusters 20, and minimize the impact on other battery clusters 20. The spray port 31 is provided in a one-to-one correspondence with the explosion-proof valve 203, and the fire of the battery pack 2 is extinguished in a targeted manner, and the expansion-type fire-retardant coating on the surface of the battery pack 2 can be prevented from hindering the normal operation of the spray port 31.

[0057] Furthermore, by arranging the spray pipe 3 on the surface of the box wall 101 of the container body 10 , a relatively simple structure is provided, thereby achieving the purpose of arranging the spray ports 31 corresponding to the explosion-proof valves 203 of the plurality of battery packs 2 .

[0058] In order to clearly show the specific positional relationship between the spray pipe 3 and the spray port 31 relative to the battery pack 2 of the battery cluster 20 and the explosion-proof valve 203, Figure 6 The specific structure of the container body 10 is hidden and replaced by a dotted rectangular frame.

[0059] Furthermore, a battery management system (BMS) is also provided in the energy storage container 100. The battery management system arranges sensors in each battery cluster 20 to detect the operating status of each battery cluster 20. At the same time, according to the parameters of the sensor, it can quickly determine whether the battery cluster 20 is in an abnormal state (thermal runaway). By electrically connecting the battery management system with the water valve connected to the spray pipe 3 and the spray port 31, when the battery pack 2 on the corresponding battery cluster 20 has thermal runaway, the water valve is opened, so that the spray port 31 sprays the explosion-proof valve 203 of the battery pack 2, and promptly eliminates the impact of the thermal runaway of the battery cluster 20 on the energy storage container 100. Compared with other control schemes, the battery management system controls whether the spray port 31 is opened, and the response is more timely and the degree of automation is better.

[0060] Finally, it should be noted that the above implementation modes are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned implementation modes, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned implementation modes can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the implementation modes of the present application.

Claims

1. An energy storage container, characterized in that: It comprises a container body and a plurality of battery clusters, each of which comprises a support frame and a plurality of battery packs, the battery packs are sequentially arranged on the support frame in a vertical direction, the battery clusters are arranged in two rows in the container body, the shell of the battery pack has four side walls arranged end to end, three of which are respectively facing the adjacent battery clusters as first side walls, and the other side wall is a second side wall; An intumescent fire-retardant coating is provided on the shell surface of the battery pack, and the intumescent fire-retardant coating covers at least three of the first side walls; positive and negative electrodes, electrical control lines and explosion-proof valves are also provided on the battery pack, and the positive and negative electrodes, the electrical control lines and the explosion-proof valve are all located on the second side wall.

2. The energy storage container according to claim 1, characterized in that: The intumescent fire retardant coating is also arranged on the top surface of the shell of the battery pack and / or on the bottom surface of the shell of the battery pack.

3. The energy storage container according to claim 1, characterized in that: The intumescent fire retardant coating is also disposed on the surface of the second side wall, and the intumescent fire retardant coating is disposed at a position on the surface of the second side wall that avoids the positive and negative electrodes, the electrical control wires and the explosion-proof valve.

4. The energy storage container according to claim 1, characterized in that: The energy storage container further includes a plurality of spray ports, each of which corresponds to each of the battery packs one by one, and each of the spray ports is arranged toward the explosion-proof valve.

5. The energy storage container according to claim 4, characterized in that: The energy storage container also includes a spray pipe extending in a vertical direction, the spray pipe is arranged between the box wall of the container body and the battery cluster, the spray pipe is fixed to the box wall surface of the container body, and the plurality of spray ports are sequentially arranged on the spray pipe.

6. The energy storage container according to claim 4, characterized in that: The energy storage container further includes a battery management system, which can detect the state of the battery cluster, and the battery management system is electrically connected to a water valve connected to the spray port.

7. The energy storage container according to claim 2, characterized in that: The shell of the battery pack includes an upper shell and a lower shell, the upper shell and the lower shell are combined and connected to each other in the vertical direction, the four side walls are formed on the upper shell, and the intumescent fire retardant coating is arranged on the outer surface of the entire upper shell.

8. The energy storage container according to claim 7, characterized in that: The battery pack is connected to the support frame through the lower shell.

9. The energy storage container according to any one of claims 1 to 8, characterized in that: The coating thickness of the intumescent fire retardant coating is set so as to be able to contact the surface of the adjacent battery cluster when the intumescent fire retardant coating expands due to heat.

10. The energy storage container according to any one of claims 1 to 8, characterized in that: The intumescent fire retardant coating is formed by a spraying process.

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