Patent Publication Number: US-2022226682-A1

Title: Fire-fighting fluid storage apparatus of battery pack

Description:
This application is a continuation of U.S. patent application Ser. No. 17/358,959, filed on Jun. 25, 2021, which is a continuation of International Application No. PCT/CN2019/076315, filed on Feb. 27, 2019, which claims priority to Chinese Patent Application No. 201822234086.0, filed to the Chinese Patent Office on Dec. 28, 2018 and entitled “FIRE-FIGHTING FLUID STORAGE APPARATUS OF BATTERY PACK”, the entire content of which is incorporated herein by reference. 
    
    
     TECHNICAL FIELD 
     The present application relates to the technical field of energy storage components, and in particular, to a fire-fighting fluid storage apparatus of a battery pack. 
     BACKGROUND 
     At present, safety accidents related to electric vehicles occur frequently, and one of the major factors causing these safety accidents is the auto-ignition of batteries. The battery includes a box body and a unit battery located inside the box body. When the unit battery undergoes a thermal failure, it releases a high-temperature heat flow. And it is easy to burn when the high-temperature flow comes in contact with air after leaking. The heat flow spreads to adjacent unit batteries will lead the battery pack to burn, which will bring serious harm to the safety of passengers and drivers. 
     Therefore, a current power battery is usually equipped with a fire-fighting spraying system. The fire-fighting spraying system includes a liquid storage apparatus and a gas storage apparatus, and spray is achieved by compressed gas in the gas storage apparatus driving the fire-fighting fluid in the liquid storage apparatus. 
     However, the above-mentioned fire-fighting spraying system has disadvantages such as occupying large space and inconvenient spatial arrangement. 
     SUMMARY 
     In view of this, an embodiment of the present application is provided with a fire-fighting fluid storage apparatus for a battery pack to solve the problems of occupying larger space and inconvenient spatial arrangement of the liquid storage apparatus and gas storage apparatus in the prior art. 
     Embodiments of the present application is provided with a fire-fighting fluid storage apparatus of a battery pack, including: 
     a box, wherein the box has an inner cavity; 
     a partition member, wherein the partition member is located in the inner cavity of the box, and the box is divided into a liquid storage portion and a gas storage portion by the partition member; 
     wherein the liquid storage portion is provided with a fluid outlet, and the gas storage portion is provided with a fluid inlet, 
     a fire-fighting fluid in the liquid storage portion is configured to be driven by the partition member to move toward the fluid outlet under the action of compressed gas in the gas storage portion. 
     Preferably, the partition member includes a partition plate, the partition plate is configured to be moved relative to an inner wall of the box under the action of the compressed gas in the gas storage portion, to push the fire-fighting fluid in the liquid storage portion to move toward the fluid outlet. 
     Preferably, a slide sealing member is arranged between an outer peripheral wall of the partition plate and the inner wall of the box. 
     Preferably, the partition member includes a diaphragm, the diaphragm is configured to be expanded under the action of the compressed gas in the gas storage portion, to push the fire-fighting fluid in the liquid storage portion to move toward the fluid outlet. 
     Preferably, the liquid storage portion and the gas storage portion are distributed along a lengthwise direction L of the box, and the partition member is configured to be moved along the lengthwise direction L of the box. 
     Preferably, the liquid storage portion and the gas storage portion are distributed along a height direction H of the box, and the liquid storage portion is located below the gas storage portion; 
     and the partition member is configured to be moved along the height direction H of the box. 
     Preferably, the fluid inlet is arranged at a box top wall or a box side wall of the box, and the fluid outlet is arranged at a liquid storage bottom wall of the liquid storage portion; 
     along the height direction H of the box, a distance between the fluid inlet and a bottom of the box is greater than a distance between the fluid outlet and the bottom of the box. 
     Preferably, the liquid storage bottom wall of the liquid storage portion includes a first planar portion and an inclined portion, and the inclined portion is inclined downward relative to the first planar portion; 
     the fluid outlet is arranged at a liquid storage side wall of the liquid storage portion, and a center line Y of the fluid outlet is located below the first planar portion. 
     Preferably, the liquid storage bottom wall of the liquid storage portion further includes a second planar portion, the second planar portion is located under the first planar portion, and the first planar portion is connected to the second planar portion by the inclined portion. 
     Preferably, a mounting portion is provided and connected to an outer wall of the box, and the mounting portion extends downward below the box; 
     the mounting portion is provided with a first mounting hole and a second mounting hole; 
     and between the first mounting hole and the second mounting hole, one is a round hole, and the other is an oblong hole. 
     Preferably, a height of the mounting portion is greater than a height of the inclined portion. 
     At the same time, embodiments of the present application is provided with a fire-fighting fluid storage apparatus of a battery pack, including: 
     a box, wherein the box has an inner cavity, and the box is provided with a fluid inlet and a fluid outlet; 
     the fluid inlet is located above the fluid outlet; 
     and the inner cavity of the box is used to store fire-fighting fluid and compressed gas, and the fire-fighting fluid in the inner cavity of the box is configured to be discharged from the fluid outlet under the action of the compressed gas. 
     In the present application, when the fire-fighting fluid in the liquid storage portion is not discharged from the fluid outlet, the acting force of the fire-fighting fluid in the liquid storage portion on the partition member is balanced with the acting force of the compressed gas in the gas storage portion on the partition member, so that the partition member can stay at the position. When the fire-fighting fluid in the liquid storage portion is discharged from the fluid outlet, the thrust of the fire-fighting fluid in the liquid storage portion on the partition member is reduced, then under the action of the compressed gas in the gas storage portion, the fire-fighting fluid in the liquid storage portion can be driven to move toward the direction of the fluid outlet by the partition member, so that the fire-fighting fluid is discharged from the fluid outlet, thereby realizing the function of driving the fire-fighting fluid with the compressed gas. In the meantime, the fire-fighting fluid storage apparatus also has advantages such as simple structure and small space occupation. 
     When the fire-fighting fluid storage apparatus is used in the spraying system of the battery pack, the fire-fighting fluid in the liquid storage portion is spraying liquid, and the fluid outlet of the liquid storage portion communicates with a spraying pipeline of the spraying system. When the unit battery in the battery pack is experiencing a thermal runway and a heat flow is ejecting from an explosion-proof valve, the spraying pipeline at this position may form an opening under the action of the heat flow, so that the spraying liquid in the spraying pipeline discharges from the opening. Then part of the spraying liquid in the liquid storage portion enters the spraying pipeline such that an amount of spraying liquid in the liquid storage portion is reduced, and the balance is broken. The compressed gas in the gas storage portion drives the partition member, and then drives the fire-fighting fluid in the liquid storage portion to enter the spraying pipeline and be sprayed from the opening of the spraying pipeline to prevent heat diffusion. 
     Therefore, in the spraying system of the battery pack, the gas storage portion of the fire-fighting fluid storage apparatus functions as a driving apparatus of the spraying liquid, and there is no need to install additional monitoring apparatuses and control apparatuses. That is, the spraying system does not need to be equipped with sensors. The spray may be implemented merely with the relationship among the components in the spraying system, and may respond fast with a simple structure. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       To describe the technical solutions in the embodiments of the present application more clearly, the following briefly describes the accompanying drawings required for the embodiments. Apparently, the accompanying drawings in the following description show merely some embodiments of the present application, and persons of ordinary skill in the art may still derive other drawings from these accompanying drawings without creative efforts. 
         FIG. 1  is a schematic structural diagram of a spraying system of a battery pack provided in an embodiment of the present application; 
         FIG. 2  is a perspective view of a fire-fighting fluid storage apparatus of  FIG. 1  in the first embodiment; 
         FIG. 3  is a front view of  FIG. 2 ; 
         FIG. 4  is a bottom view of  FIG. 2 ; 
         FIG. 5  is a schematic structural diagram of the fire-fighting fluid storage apparatus of  FIG. 1  in the second embodiment; and 
         FIG. 6  is a schematic structural diagram of the fire-fighting fluid storage apparatus of  FIG. 1  in the third embodiment. 
     
    
    
     REFERENCE SIGNS 
     
         
         
           
             A—Fire-fighting fluid storage apparatus; 
               1 —Box; 
               11 —Liquid storage portion; 
               111 —Fluid outlet; 
               112 —Liquid storage bottom wall; 
               112   a —First planar portion; 
               112   b —Second planar portion; 
               112   c —Inclined portion; 
               113 —Liquid storage side wall; 
               12 —Gas storage portion; 
               121 —Fluid inlet; 
               13 —Partition member; 
               14 —Box top wall; 
               15 —Box side wall; 
               2 —Mounting portion; 
               21 —First mounting hole; 
               22 —Second mounting hole; 
             Y—Center line; 
             B—Spraying pipeline. 
           
         
       
    
     DESCRIPTION OF EMBODIMENTS 
     To better understand the technical solutions in the present application, the following describes embodiments of the present application with reference to the accompanying drawings. 
     It should be understood that the described embodiments are merely part but not all of the embodiments of the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application. 
     The terms used in the embodiments of the present application is merely for the purpose of describing specific embodiments and is not intended to limit the present application. The singular forms “one”, “said” and “the” used in the embodiments of the present application and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. 
     It should be understood that the term “and/or” in this specification describes only an association relationship for describing associated objects and represents that three relationships may exist. For example, A and/or B may represent the following three cases: Only A exists, both A and B exist, and only B exists. In addition, the character “/” in this text generally indicates that the associated objects before and after the character are in an “or” relationship. 
     It should be understood that the directional terms such as “up”, “down”, “left”, and “right” described in the embodiments of the present application are described as seen from the angles shown in the accompanying drawings, and should not be understood as a limitation to the embodiments of the present application In addition, in the context, it should be understood that, when it is mentions an element connecting to “upper” or “lower” of another element, the element can not only directly connect to the “upper” or “lower” of another element, but can connect to the “upper” or “lower” of another element by intermediate element. 
     A battery pack includes a box and a unit battery, wherein the unit battery is provided with an explosion-proof valve. When the unit battery is experiencing thermal runway, a high-temperature and high-pressure heat flow is generated therein. The explosion-proof valve is used to discharge the heat flow to lower the risk of explosion of the unit battery. However, when the heat flow is discharged from the explosion-proof valve, the high temperature heat flow may cause an adjacent unit battery to burn. In order to reduce the risk of burning the adjacent unit batteries when a certain unit battery is experiencing the thermal runway, in the present application, a spraying system is added to the battery pack to reduce heat flow diffusion and improve the safety of the battery pack. 
     The spraying system includes a spraying pipeline and a liquid storage apparatus, where spraying pipeline communicates with the liquid storage apparatus. When the unit battery is experiencing the thermal runway, the spraying pipeline may form an opening under the action of the heat flow such that the spraying liquid in the spraying pipeline discharges from the opening, thereby the spraying liquid in the liquid storage portion enters the spraying pipeline and discharges from the opening. For the liquid storage apparatus, a liquid storage apparatus communicating with the gas storage apparatus may be provided, where compressed gas is stored in the gas storage apparatus. The compressed gas can drive the spraying liquid in the liquid storage apparatus into the spraying pipeline, where the liquid storage apparatus and the gas storage apparatus are arranged separately. In the present application, a fire-fighting fluid storage apparatus is provided, which may integrate the liquid storage apparatus and the gas storage apparatus, and has the advantages of small space occupation and simple structure. The specific structure is described below. 
     With reference to  FIGS. 1-6 ,  FIG. 1  is a schematic structural diagram of a spraying system of a battery pack provided in an embodiment of the present application;  FIG. 2  is a perspective view of a fire-fighting fluid storage apparatus of  FIG. 1  in the first embodiment;  FIG. 3  is a front view of  FIG. 2 ;  FIG. 4  is a bottom view of  FIG. 2 ;  FIG. 5  is a schematic structural diagram of the fire-fighting fluid storage apparatus of  FIG. 1  in the second embodiment; and  FIG. 6  is a schematic structural diagram of the fire-fighting fluid storage apparatus of  FIG. 1  in the third embodiment. 
     An embodiment of the present application is provided with a fire-fighting fluid storage apparatus A. The fire-fighting fluid storage apparatus A is used in a battery pack, where the battery pack includes a housing, wherein the housing has an inner cavity; and a unit battery, disposed in the cavity of the housing. 
     Specifically, the battery pack further includes a spraying system, where the spraying system includes a spraying pipeline B and the fire-fighting fluid storage apparatus A, and the spraying pipeline B communicates with the fire-fighting fluid storage apparatus A. 
     More specifically, as shown in  FIGS. 2-6 , the fire-fighting fluid storage apparatus A includes: a box  1 , where the box  1  has an inner cavity, and the inner cavity is used for accommodating fluid (in the present application, the inner cavity of the box  1  is used to accommodate compressed gas and fire-fighting fluid); a partition member  13 , where the partition member  13  is located in the inner cavity of the box  1 . The partition member  13  divides the box  1  into a liquid storage portion  11  and a gas storage portion  12 . The partition member  13  divides the inner cavity of the box  1  into two cavities, between the two cavities, one is used to store fire-fighting fluid, and the other is used to store compressed gas. The cavity storing fire-fighting fluid is formed in the liquid storage portion  11  of the fire-fighting fluid storage apparatus A, and the cavity storing compressed gas is formed in the gas storage portion  12  of the fire-fighting fluid storage apparatus A. 
     The fire-fighting fluid in the present application includes fluorinated liquid. After being sprayed from the spraying pipeline  11 , the fluorinated liquid can chemically react with the heat flow in the unit battery  2  so as to absorb heat and prevent heat diffusion. In addition, the compressed gas in the present application may be incombustible gas such as helium, nitrogen, argon, and like. 
     In the embodiment shown in  FIGS. 2-6 , the cavity for storing fluid and the cavity for storing compressed gas above are both enclosed by the inner wall of the box  1  and the partition member  13 . Meanwhile, the liquid storage portion  11  has a fluid outlet  111 , and the gas storage portion  12  has a fluid inlet  121 . The partition member  13  can drive the fire-fighting fluid in the liquid storage portion  11  to move toward the fluid outlet  111  under the action of the compressed gas in the gas storage portion  12 . 
     In the present application, when the fire-fighting fluid in the liquid storage portion  11  is not discharged from the fluid outlet  111 , the acting force of the fire-fighting fluid in the liquid storage portion  11  on the partition member  13  is balanced with the acting force of the compressed gas in the gas storage portion  12  on the partition member  13 , so that the partition member  13  can stay at the position. When the fire-fighting fluid in the liquid storage portion  11  is discharged from the fluid outlet  111 , the thrust of the fire-fighting fluid in the liquid storage portion  11  on the partition member  13  is reduced, then under the action of the compressed gas in the gas storage portion  12 , the fire-fighting fluid in the liquid storage portion  11  can be driven to move toward the direction of the fluid outlet  111  by the partition member  13  so that the fire-fighting fluid is discharged from the fluid outlet  111 , thereby realizing the function of driving the fire-fighting fluid with the compressed gas. In the meantime, the fire-fighting fluid storage apparatus A also has advantages such as simple structure and small space occupation. 
     When the fire-fighting fluid storage apparatus A is used in the spraying system of the battery pack, the fire-fighting fluid in the liquid storage portion  11  is spraying liquid, and the fluid outlet  111  of the liquid storage portion  11  communicates with a spraying pipeline of the spraying system. When the unit battery in the battery pack is experiencing a thermal runway and a heat flow is ejecting from the explosion-proof valve, under the action of the heat flow, the spraying pipeline at this position may form an opening, and then the spraying liquid in the spraying pipeline discharges from the opening such that part of the spraying liquid in the liquid storage portion  11  enters the spraying pipeline, thereby an amount of spraying liquid in the liquid storage portion  11  is reduced, and the balance is broken. The compressed gas in the gas storage portion  12  drives the partition member  13 , thereby driving the fire-fighting fluid in the liquid storage portion  11  to enter the spraying pipeline and be sprayed from the opening of the spraying pipeline to prevent heat diffusion. 
     Therefore, in the spraying system of the battery pack, the gas storage portion  12  of the fire-fighting fluid storage apparatus A is used as a driving apparatus of the spraying liquid, and there is no need to install additional monitoring apparatuses and control apparatuses, that is, the spraying system does not need to be equipped with sensors. The spray may be implemented only with the relationship among the components of the spraying system, of which the response speed is fast and the structure is simple. 
     In addition, the fire-fighting fluid storage apparatus A in the present application can be used in the spraying system of the battery pack, and other occasions. 
     Specifically, in the first embodiment, as shown in  FIGS. 2-6 , the partition member  13  includes a partition plate. The partition plate is disposed in the inner cavity of the box  1  and can move relative to the inner wall of the box  1  under the action of the compressed gas in the gas storage portion  12 , to push the fire-fighting fluid in the liquid storage portion  11  to move toward the fluid outlet  111 . 
     In the embodiment, when the unit battery of the battery pack is experiencing the thermal runway and the fire-fighting fluid is discharged from the opening of the spraying pipeline, the fire-fighting fluid in the liquid storage portion  11  enters the spraying pipeline through the fluid outlet  111 . The thrust of the fire-fighting fluid in the liquid storage portion  11  on the partition member  13  is reduced, and under the action of the compressed gas in the gas storage portion  12 , the fire-fighting fluid in the liquid storage portion  11  can push the partition member  13  to move toward the liquid storage portion  11 , thereby reducing the volume of the liquid storage portion  11  and increasing the volume of the gas storage portion  12 . During the movement of the partition member  13 , the fluid in the liquid storage portion  11  can continue to be discharged from the fluid outlet  111 . Therefore, in the embodiment, the partition member  13  is used to discharge the fire-fighting fluid in the liquid storage portion  11 . 
     More specifically, in the embodiment, a slide sealing member is arranged between an outer peripheral wall of the partition plate and the inner wall of the box  1 . The slide sealing member is provided so that the partition member  13  can move relative to the inner wall of the box  1 . And the slide sealing member can function as a sealing, which reduces the risk of the liquid and/or compressed gas flowing between the outer peripheral wall of the partition member  13  and the inner wall of the box  1 , thereby improving the sensitivity of movement of the partition member  13 . 
     For example, the above-mentioned slide sealing member may be a pack sealing or the like. 
     On the other hand, as the first embodiment shown in  FIGS. 2-4 , in the box  1 , the liquid storage portion  11  and the gas storage portion  12  are distributed along the lengthwise direction L of the box  1 , and the partition member  13  can move along the lengthwise direction L of the box  1 . During the movement of the partition member  13 , the volume of the liquid storage portion  11  can be reduced and the volume of the gas storage portion  12  can be increased, so under the thrust of the partition member  13 , the fluid in the liquid storage portion  11  can be discharged from the fluid outlet  111 . At the same time, as the volume of the gas storage portion  12  increases, the thrust of the compressed gas on the partition member  13  decreases. In order to further increase the speed and flow rate of the fluid discharged from the fluid outlet  111 , the compressed gas may be introduced continually to the fluid outlet  121  in the gas storage portion  12  so that the fluid discharged from the fluid outlet  111  can have a higher speed and flow rate, thereby satisfying the requirements of the battery pack. 
     As the second embodiment shown in  FIG. 5 , the liquid storage portion  11  and the gas storage portion  12  are distributed along the height direction H of the box  1 , and the liquid storage portion  11  is located below the gas storage portion  12 . At the same time, the member  13  can move along the height direction H of the box  1 . Specifically, in the solution of the present embodiment, the partition member  13  can move downward along the inner wall of the box  1  so as to reduce the volume of the liquid storage portion  11  and increase the volume of the gas storage portion  12  during the movement of the partition member  13 , thereby pushing the fluid to be discharged from the fluid outlet  111 . In the meantime, the compressed gas can be introduced continually through the fluid inlet  121 . 
     In the above three embodiments, the partition member  13  has a plate-like structure. When the partition member  13  is arranged in the inner cavity of the box  1 , the inner cavity of the liquid storage portion  11  and the inner cavity of the gas storage portion  12  have structures with regular shapes. It is sure that the partition member  13  may also have other shapes. For example, the partition member  13  may be a multi-bent structure, and when it is located inside of the inner cavity of the box  1 , the structure of both the inner cavity of the liquid storage portion  11  and the inner cavity of the gas storage portion  12  are irregular, and the distribution of the two is not limited. 
     In addition, in the above three embodiments, the box  1  is a structure with the same cross-sectional area (such as a rectangular parallel pipelined structure), so the partition member  13  is not limited during the movement. When the cross-sectional area of the box  1  changes (for example, the box  1  is a spherical structure), the partition member  13  needs to adapt to the change of the cross-sectional area of the box  1  during the movement. For example, the partition member  13  may be a retractable structure. 
     In the second embodiment, the partition member  13  includes a diaphragm. The diaphragm can expand under the action of the compressed gas in the gas storage portion  12 , to push the fire-fighting fluid in the liquid storage portion  11  to move toward the fluid outlet  111 . 
     In the embodiment, when the unit battery of the battery pack is experiencing the thermal runway and the fire-fighting fluid is discharged from the opening of the spraying pipeline, the fire-fighting fluid in the liquid storage portion  11  enters the spraying pipeline through the fluid outlet  111 , and the acting force of the fire-fighting fluid of the liquid storage portion  11  on the diaphragm decreases. The diaphragm expands under the action of the compressed gas in the gas storage portion  12 , so that the fire-fighting fluid in the liquid storage portion  11  can be pushed to flow toward the direction of the fluid outlet  111 . Therefore, in the embodiment, the fire-fighting fluid in the liquid storage portion  11  is discharged by the expansion of the partition member  13 . 
     The above-mentioned diaphragm may be an Ethylene Propylene Diene Monomer (EPDM) diaphragm. 
     On the other hand, in the above embodiments, in order to facilitate the discharge of the fire-fighting fluid from the fluid outlet  111 , the fluid outlet  111  should be located below the fluid inlet  121 . Specifically, the first arrangement of the fluid inlet  121  and the fluid outlet  111  is (not shown in the figure): the fluid inlet  121  arranged at the box top wall  14  or the box side wall  15  of the box  1 ; the fluid outlet  111  arranged at the liquid storage bottom wall  112  of the liquid storage portion  11  in the box  1 . 
     In the present embodiment, when the fluid outlet  111  is provided in the liquid storage bottom wall  112  of the liquid storage portion  11 , after the opening is formed in the spraying pipeline, the spraying liquid can enter the spraying pipeline from the liquid storage portion  11  under the action of gravity such that the flow rate of the spraying liquid sprayed from the opening of the spraying pipeline becomes large in a short time, and the spray effect can be improved. 
     As shown in  FIGS. 2-6 , the second arrangement of the fluid inlet  121  and the fluid outlet  111  is: the fluid inlet  121  provided in the box top wall  14  or the box side wall  15  of the box  1 . At the same time, as shown in  FIGS. 3 and 5 , the liquid storage bottom wall  112  of the liquid storage portion  11  includes a first planar portion  112   a  and an inclined portion  112   c , where the inclined portion  112   c  is inclined downward relative to the first flat portion  112   a . Therefore, for the liquid storage portion  11 , the downwardly inclined portion  112   c  forms a concave structure, and the concave structure is located below other positions of the box  1 . In this case, the fluid outlet  111  is provided in the liquid storage side wall  113  of the liquid storage portion  11  and the center line Y of the fluid outlet  111  is located below the first planar portion  112   a . That is, the fluid outlet  111  corresponds to the above-mentioned concave structure. 
     In the present embodiment, after the inclined portion  112   c  is provided at the bottom of the liquid storage portion  11  and the concave structure is formed, the fluid in the liquid storage portion  11  has a tendency to flow toward the concave structure under the action of gravity. When the fluid outlet  111  is provided at the concave structure, it can facilitate the discharge of fluid from the fluid outlet  111 , and more importantly, reduce the amount of spraying liquid remaining in the liquid storage portion  11 , thereby improving the spray effect and the utilization rate of the spraying liquid. 
     Therefore, in the present embodiment, after the inclined portion  112   c  is provided, the discharge of fluid from the fluid outlet  111  is facilitated and the residual amount of liquid is reduced. At the same time, there is no need to provide the fluid outlet  111  at the bottom of the liquid storage portion  11 , so that a bottom surface of the box  1  can be used as an installation surface, which improves installation flexibility and reduces installation difficulty. 
     Further, as shown in  FIGS. 3 and 5 , the bottom wall of the liquid storage portion  11  further includes a second planar portion  112   b , where the second planar portion  112   b  is located below the first planar portion  112   a , and the first planar portion  112   a  and the second planar portion  112   b  are connected by the inclined portion  112   c . The second planar portion  112   b  is also connected with the liquid storage side wall  113  of the liquid storage portion  11 . Therefore, the second planar portion  112   b  is located below other portions of the box  1 . 
     At the same time, a mounting portion  2  is connected to an outer side of the box  1 , and the mounting portion  2  can be used for mounting with the housing of the battery pack. As shown in  FIG. 2 , the mounting portion  2  extends downward the box  1 . 
     In the present embodiment, since the second planar portion  112   b  and the mounting portion  2  both extend downward relative to the box  1 , therefore the second planar portion  112   b  and the mounting portion  2  can be used as a mounting structure of the fire-fighting fluid storage apparatus A, where the second planar portion  112   b  can support an external equipment, the mounting portion  2  can be bolted to the external equipment, so that reliability of the installation of the fire-fighting fluid storage apparatus A can be improved by the auxiliary support of the second planar portion  112   b.    
     Specifically, the second planar portion  112   b  may be flush with the installation plane of the installation portion  2  or not, which can be arranged according to the specific installation environment. 
     At the same time, a height of the above mounting portion  2  is greater than a height of the inclined portion  112   c  so as to ensure that the fire-fighting fluid can be completely discharged, reducing the storage of a large amount of fire-fighting fluid. Therefore unnecessary weight can be reduced. 
     Specifically, as shown in  FIG. 4 , the mounting portion  2  has a first mounting hole  21  and a second mounting hole  22 . The two mounting holes are used to connect external equipment with bolts or pins. Between the first mounting hole  21  and the second mounting hole  22 , one is a round hole and the other is an oblong hole, where the oblong hole is used to trim the position of the fire-fighting fluid storage apparatus A, or to adapt to errors generated in the manufacturing and assembly process, and the round hole is used to secure to the external equipment. 
     In addition, as shown in  FIGS. 3 and 5 , the mounting portion  2  is provided at one side of the fluid inlet  121  to provide support by the mounting portion  2 , to withstand the relatively large pressure at the fluid inlet  121 . 
     At the same time, an embodiment of the present application also provides another fire-fighting fluid storage apparatus A of the battery pack, which includes a box  1 , where the box  1  is provided with a fluid inlet  121  and a fluid outlet  111 . The fluid inlet  121  is located on the fluid outlet  111 . The box  1  has an inner cavity, and the inner cavity of the box  1  is used to store fire-fighting fluid and gas. And the fire-fighting fluid in the inner cavity of the box  1  can be discharged from the fluid outlet  111  under the action of the compressed gas. 
     In the present embodiment, when the fire-fighting fluid storage apparatus A is working, a certain amount of fire-fighting fluid is firstly introduced through the fluid inlet  121 . Normally, the fire-fighting fluid does not completely occupy the space in the inner cavity of the box  1 . And then the compressed gas is introduced through the fluid inlet  121  so that the compressed gas in the inner cavity of the box  1  can reach a preset air pressure. When the fire-fighting fluid storage apparatus A is used in a battery pack and the unit battery in the battery pack is experiencing the thermal runway, the spraying pipeline opens, and the fire-fighting fluid in the spraying pipeline is discharged from the opening. At the same time, under the action of compressed gas pressure, the fire-fighting fluid in the inner cavity of the box  1  is pushed in to the spraying pipeline to achieve the spray. 
     The foregoing descriptions are merely example embodiments of the present application, but are not intended to limit the present application. Any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the present application shall fall within the protection scope of the present application.