Battery pack and energy storage system

Abstract

The utility model relates to the technical field of energy storage, and discloses a battery pack and an energy storage system.The battery pack comprises a shell, a plurality of battery cells, a high-temperature-resistant partition plate and a fire fighting device. The shell is provided with a containing cavity. The battery cell comprises a shell, and an anti-explosion valve is arranged at the first end of the shell. The high-temperature-resistant partition plate is arranged in the containing cavity and divides the containing cavity into a first cavity body and a second cavity body, the shell is arranged in the first cavity body, the high-temperature-resistant partition plate is provided with first through holes in one-to-one correspondence with the anti-explosion valves, the first end of the shell faces the partition plate, and the first through holes are used for communicating the anti-explosion valves with the second cavity body when the anti-explosion valves are opened. The fire fighting device is arranged in the second cavity and used for releasing a fire extinguishing agent into the second cavity. In this way, the fire extinguishing agent entering the first cavity can be reduced, and the concentration of the fire extinguishing agent in the second cavity is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, in particular to a battery pack and an energy storage system. BACKGROUND

[0002] Air-cooled battery packs are widely used in various battery systems due to their good heat dissipation performance. In order to effectively reduce the temperature inside the battery pack, the air-cooled battery pack is usually designed to have multiple heat dissipation holes on the shell that are in communication with the accommodating cavities containing the cell housings, and is equipped with a fan to achieve forced convection heat exchange. Although this design can effectively dissipate the heat generated during the operation of the battery pack, it also brings a series of fire safety hazards.

[0003] Inside the battery pack, a fire extinguishing device is usually installed to deal with the risk of fire. The fire extinguishing device releases extinguishing agent directly into the accommodating cavities for fire extinguishing. However, due to the presence of the heat dissipation holes and the fan of the air-cooled battery pack, the extinguishing agent after the fire extinguishing spray is often quickly discharged through the heat dissipation holes or carried away by the airflow of the fan, so that the extinguishing agent cannot form an effective fire extinguishing density inside the battery pack. CONTENT OF THE UTILITY MODEL

[0004] In view of the problems in the background art, the purpose of the present application is to provide a battery pack and an energy storage system, which overcome the above problems or at least partially solve the above problems.

[0005] According to a first aspect of the present application, a battery pack is provided, comprising: a shell, a plurality of cells, a high-temperature-resistant partition plate, and a fire extinguishing device. The shell is provided with an accommodating cavity. The cell comprises a housing, and a first end of the housing is provided with an explosion-proof valve. The high-temperature-resistant partition plate is arranged in the accommodating cavity, and the high-temperature-resistant partition plate divides the accommodating cavity into a first cavity and a second cavity. The housing is arranged in the first cavity, and the high-temperature-resistant partition plate is provided with a first through hole corresponding to the explosion-proof valve one by one. The first end of the housing faces the partition plate, and the first through hole is used to communicate the explosion-proof valve with the second cavity when the explosion-proof valve is opened. The fire extinguishing device is arranged in the second cavity, and the fire extinguishing device is used to release extinguishing agent into the second cavity.

[0006] In one or more optional embodiments above, the cell comprises a first pole and a second pole, and the first pole and the second pole are arranged at the first end of the housing. The high-temperature-resistant partition plate is provided with a second through hole and a third through hole corresponding to the first pole and the second pole respectively, and along the direction from the first cavity to the second cavity, one first pole is arranged in one second through hole, and one second pole is arranged in one third through hole.

[0007] In one or more optional embodiments above, the battery pack comprises an insulating support arranged on a side of the high-temperature-resistant partition plate opposite to the shell, the insulating support is provided with fourth, fifth and sixth through holes corresponding to the first, second and third through holes respectively, and in a direction from the first cavity to the second cavity, one fourth through hole is in communication with one first through hole, one fifth through hole is in communication with one second through hole, and one sixth through hole is in communication with one third through hole.

[0008] In one or more optional embodiments above, the battery pack comprises a plurality of busbars, the insulating support is provided with accommodating grooves corresponding to the busbars, one busbar is arranged in one accommodating groove, and the fifth and sixth through holes are located at groove bottoms of the accommodating grooves. An end of the first pole away from the shell is connected to the busbar after sequentially passing through the second through hole and the fifth through hole, and an end of the second pole away from the shell is connected to the busbar after sequentially passing through the third through hole and the sixth through hole.

[0009] In one or more optional embodiments above, the battery pack comprises an insulating partition plate arranged on a side of the insulating support opposite to the high-temperature-resistant partition plate. The high-temperature-resistant partition plate has a first preset melting point, and the insulating partition plate has a second preset melting point, and the first preset melting point is greater than the second preset melting point.

[0010] In one or more optional embodiments above, the insulating partition plate covers the fourth through hole.

[0011] In one or more optional embodiments above, the battery pack comprises a temperature sensing wire, one end of the temperature sensing wire is connected to the fire-fighting device, the temperature sensing wire is used for sensing the temperature of the battery pack, and the fire-fighting device is triggered when the temperature of the battery pack reaches a threshold value.

[0012] In one or more optional embodiments above, the battery pack comprises a control unit used for being connected to a management unit of an energy storage system, the fire-fighting device is provided with a temperature switch, the control unit is electrically connected to the temperature switch, and the temperature switch is used for transmitting an electric signal to the control unit when the temperature reaches a threshold value.

[0013] In one or more optional embodiments above, the shell is provided with a heat dissipation hole in communication with the outside world.

[0014] According to a second aspect of the present application, an energy storage system is provided, comprising the battery pack as described above.

[0015] The beneficial effects of the embodiments of the present application are that the battery pack provided by the embodiments of the present application separates the first cavity provided with the cell shell and the second cavity provided with the fire-fighting device by the high-temperature-resistant partition plate, and a first through hole aligned with the explosion-proof valve is arranged as a passage for the flame entering the second cavity when the explosion-proof valve is opened. Compared with the conventional way that the extinguishing agent released by the fire-fighting device of the battery pack directly enters the containing cavity for fire extinguishing, the high-temperature-resistant partition plate is beneficial to reduce the extinguishing agent entering the first cavity and improve the concentration of the extinguishing agent in the second cavity. When applied to the air-cooled battery pack, the high-temperature-resistant partition plate separates the first cavity and the second cavity in communication with the heat dissipation hole, which is beneficial to reduce the extinguishing agent discharged outside the battery pack through the heat dissipation hole, thereby improving the fire extinguishing effect. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0017] Figure 1 A perspective view of a battery pack provided by the embodiments of the present application is shown in FIG. 1.

[0018] Figure 2 A cross-sectional view of a battery pack provided by the embodiments of the present application is shown in FIG. 2.

[0019] Figure 3 An enlarged view of B in FIG. 1 is shown in FIG. 3. Figure 2 An enlarged view of C in FIG. 1 is shown in FIG. 4.

[0020] Figure 4 An exploded view of a battery pack provided by the embodiments of the present application is shown in FIG. 5. Figure 2 A partial exploded view of a battery pack provided by the embodiments of the present application is shown in FIG. 6.

[0021] Figure 5 A partial view of a battery pack provided by the embodiments of the present application is shown in FIG. 7.

[0022] Figure 6 A partial view of a battery pack provided by the embodiments of the present application is shown in FIG. 8.

[0023] Figure 7 A partial view of a battery pack provided by the embodiments of the present application is shown in FIG. 9. DETAILED DESCRIPTION

[0024] For the convenience of understanding the present application, the present application will be described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element or one or more intervening elements can be present therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element or one or more intervening elements can be present therebetween. The terms "vertical", "horizontal", "left", "right", "inner", "outer", and similar expressions used in the present specification are for illustrative purposes only.

[0025] Unless otherwise defined, all technical and scientific terms used in the present specification are intended to have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used in the present specification includes any and all combinations of one or more related listed items.

[0026] In the description of the present specification, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0027] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as there is no conflict.

[0028] Please refer to Figures 1-3 and Figure 5 The battery pack 1000 includes a shell 1 and a plurality of battery cells 21. The shell 1 is provided with a receiving cavity A, and the battery cells 21 are arranged in the receiving cavity A.

[0029] In some embodiments, the battery cell 21 includes an outer shell 211, and the first end of the outer shell 211 is provided with an explosion-proof valve 2111.

[0030] In some embodiments, the battery pack 1000 includes a fire extinguishing device 3, and the fire extinguishing device 3 is arranged in the receiving cavity A.

[0031] In some embodiments, the battery pack 1000 comprises a high-temperature-resistant partition plate 4 arranged in the accommodation cavity A, the high-temperature-resistant partition plate 4 divides the accommodation cavity A into a first cavity A1 and a second cavity A2, the shell 211 is arranged in the first cavity A1, the high-temperature-resistant partition plate 4 is provided with a first through hole 41 corresponding to each of the explosion-proof valves 2111, and a first end of the shell 211 faces the partition plate, the first through hole 41 is used for communicating the explosion-proof valve 2111 with the second cavity A2 when the explosion-proof valve 2111 is opened. The fire extinguishing device 3 is used for releasing fire extinguishing agent into the second cavity A2.

[0032] When the battery cell 21 fails, the explosion-proof valve 2111 is opened, the flame generated in the battery cell 21 is sprayed out through the explosion-proof valve 2111, enters the second cavity A2 through the first through hole 41, and is extinguished by the fire extinguishing device 3 releasing the fire extinguishing agent.

[0033] The battery pack 1000 provided by the embodiments of the present application separates the first cavity A1 in which the shell 211 of the battery cell 21 is arranged from the second cavity A2 in which the fire extinguishing device 3 is arranged by the high-temperature-resistant partition plate 4, and the first through hole 41 corresponding to each of the explosion-proof valves 2111 is arranged, which is used as a passage for the flame to enter the second cavity A2 when the explosion-proof valve 2111 is opened. Compared with the conventional mode that the fire extinguishing agent released by the fire extinguishing device 3 directly enters the accommodation cavity A for extinguishing, the high-temperature-resistant partition plate 4 is beneficial to reduce the fire extinguishing agent entering the first cavity A1 and improve the concentration of the fire extinguishing agent in the second cavity A2. When applied to the air-cooled battery pack, the high-temperature-resistant partition plate 4 separates the first cavity A1 communicating with the heat dissipation hole from the second cavity A2, which is beneficial to reduce the fire extinguishing agent discharged outside the battery pack 1000 through the heat dissipation hole, thereby improving the extinguishing effect.

[0034] In some embodiments, the fire extinguishing agent includes but is not limited to aerosol.

[0035] In some embodiments, a first through hole 41 is aligned with an explosion-proof valve 2111 in the direction from the first cavity A1 to the second cavity A2.

[0036] In some embodiments, the shell 1 is provided with a heat dissipation hole a, and the heat dissipation hole a communicates the first cavity A1 with the outside.

[0037] Please refer to Figure 2 and Figure 5 In some embodiments, the shell 1 comprises a front wall 11 and a rear wall 12 arranged opposite to each other along a first direction X, a bottom wall 13 and a top wall 14 arranged opposite to each other along a second direction Y, and a first side wall 15 and a second side wall 16 arranged opposite to each other along a third direction Z. The front wall 11, the rear wall 12, the bottom wall 13, the top wall 14, the first side wall 15 and the second side wall 16 jointly enclose to form the accommodation cavity A. In the present application, the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0038] In some embodiments, the bottom wall 13 is configured to support the battery cell 21, and the high-temperature-resistant partition plate 4 divides the accommodation cavity A into the second cavity A2 and the first cavity A1 arranged in sequence along the direction from the top wall 14 to the bottom wall 13.

[0039] In some embodiments, the fire-fighting device 3 is fixed to the top wall 14.

[0040] In some embodiments, the heat dissipation hole includes a first heat dissipation hole 15a arranged on the first side wall 15.

[0041] In some embodiments, the heat dissipation hole includes a second heat dissipation hole 16a arranged on the second side wall 16.

[0042] In some embodiments, the heat dissipation hole includes a third heat dissipation hole (not shown in the figure) arranged on the rear wall 12.

[0043] In some embodiments, the battery pack 1000 includes a heat dissipation fan 5 fixed to the shell 1, and the heat dissipation fan 5 is configured to drive airflow to flow through the first cavity A1.

[0044] In some embodiments, the front wall 11 is provided with a mounting hole 11a in communication with the first cavity A1, and the heat dissipation fan 5 is fixed to the mounting hole 11a and configured to drive gas to enter the first cavity A1 through the mounting hole 11a.

[0045] In some embodiments, the shell 1 includes a front end cover 17 arranged on the side of the front wall 11 away from the rear wall 12 along the first direction X, and the front end cover 17 and the front wall 11 enclose a receiving cavity (not shown in the figure) in which the heat dissipation fan 5 is located. The front end cover 17 is provided with an air inlet 17a in communication with the outside.

[0046] Please refer to Figure 2 and Figures 4-6 In some embodiments, the battery cell 21 includes a first pole 2112 and a second pole 2113 arranged at the first end of the shell 211. The high-temperature-resistant partition plate 4 is provided with a second through hole 43 and a third through hole 44 corresponding to the first pole 2112 and the second pole 2113 respectively, and along the direction from the first cavity A1 to the second cavity A2, a first pole 2112 is arranged in a second through hole 43, and a second pole 2113 is arranged in a third through hole 44. The first pole 2112 and the second pole 2113 can be the positive pole and the negative pole of the battery cell 21 respectively, or the negative pole and the positive pole of the battery cell 21 respectively.

[0047] In some embodiments, the number of battery cells 21 is a plurality, and the plurality of battery cells 21 form a battery cell 21 assembly 2.

[0048] In some embodiments, the plurality of battery cells 21 are arranged along the first direction X to form a first column and a second column, and the first column and the second column are spaced apart along the third direction Z to form a heat dissipation channel (not shown in the figure).

[0049] In some embodiments, the heat dissipation fan 5 is aligned with the heat dissipation channel along the first direction X.

[0050] In some embodiments, the battery cell 21 assembly 2 includes a plurality of protective sleeves 22, and a housing 211 is arranged in one of the protective sleeves 22. The protective sleeve 22 is provided with a through hole corresponding to each of the explosion-proof valve 2111, the first pole 2112 and the second pole 2113, and the explosion-proof valve 2111, the first pole 2112 and the second pole 2113 are exposed through the corresponding through holes.

[0051] In some embodiments, the battery cell 21 assembly 2 includes a limiting support 23, and the limiting support 23 is arranged between two adjacent protective sleeves 22 along the first direction X. The limiting support 23 is used for limiting and fixing the protective sleeve 22.

[0052] In some embodiments, the high-temperature-resistant partition plate 4 is arranged on a first end surface of the battery cell 21 assembly 2 facing the top wall 14 along the second direction Y. The one end of the limiting support 23 protrudes from the first end surface in the direction from the bottom wall 13 to the top wall 14. The high-temperature-resistant partition plate 4 is provided with an avoiding hole 42 corresponding to the part 231 of the limiting support 23 protruding from the first end surface, and the part 231 of the limiting support 23 protruding from the first end surface is arranged in the avoiding hole 42.

[0053] Please refer to Figure 3 , Figure 4 , Figure 6 and Figure 7 In some embodiments, the battery pack 1000 includes an insulating support 6 arranged on the side of the high-temperature-resistant partition plate 4 away from the housing 211. The insulating support 6 is provided with a fourth through hole 61, a fifth through hole 62 and a sixth through hole 63 corresponding to the first through hole 41, the second through hole 43 and the third through hole 44 respectively. Along the direction from the first cavity A1 to the second cavity A2, the fourth through hole 61 is in communication with the first through hole 41, the fifth through hole 62 is in communication with the second through hole 43, and the sixth through hole 63 is in communication with the third through hole 44.

[0054] In some embodiments, the battery pack 1000 includes a plurality of busbars 7 for connecting the plurality of battery cells 21.

[0055] In some embodiments, multiple battery cells 21 are connected in series through a bus 7, and the two ends of the bus 7 between two adjacent battery cells 21 are respectively connected to the first pole 2112 of one battery cell 21 and the second pole 2113 of the other battery cell 21. The first pole 2112 of the battery cell 21 located at the head end serves as the total positive pole, one end of a bus 7 is connected to the total positive pole, and the other end is used to connect to the positive output port of the battery pack 1000. The second pole 2113 of the battery cell 21 located at the end serves as the total negative pole, one end of a bus 7 is connected to the total negative pole, and the other end is used to connect to the negative output port of the battery pack 1000.

[0056] In some embodiments, the insulating bracket 6 is provided with a receiving groove 64 corresponding one-to-one to the bus 7, a bus 7 is provided in a receiving groove 64, the fifth through hole 62 and the sixth through hole 63 are located at the bottom of the receiving groove 64, the end of the first pole 2112 away from the outer shell 211 passes through the second through hole 43 and the fifth through hole 62 in sequence and then is connected to the bus 7, and the end of the second pole 2113 away from the outer shell 211 passes through the third through hole 44 and the sixth through hole 63 in sequence and then is connected to the bus 7.

[0057] In some embodiments, the insulating bracket 6 is provided with a wiring groove 65 , and the battery pack 1000 includes a cable 8 , which is laid in the wiring groove 65 .

[0058] In some embodiments, the battery pack 1000 includes a control unit 9 .

[0059] In some embodiments, the cable 8 includes multiple voltage detection lines 81 , one end of a voltage detection line 81 is connected to the control unit 9 , and the other end of a voltage detection line 81 is provided with a voltage detection probe 82 , and a voltage detection probe 82 is fixed to a bus 7 .

[0060] In some embodiments, the battery pack 1000 includes an insulating separator 10 , which is disposed on a side of the insulating bracket 6 facing away from the high-temperature resistant separator 4 . The insulating separator 10 is used to electrically isolate the battery cell 21 from the housing 211 .

[0061] See also Figure 5 and Figure 6 In some embodiments, the insulating partition 10 is arranged opposite to the high-temperature resistant partition 4. Along the direction from the second cavity A2 to the first cavity A1, the insulating partition 10 covers the insulating bracket 6, and the fire-fighting device 3 is located on the side of the insulating partition 10 facing away from the insulating bracket 6.

[0062] In some embodiments, the insulating bracket 6 is provided with a threaded hole 66 , and the insulating partition 10 is screwed and fixed to the insulating bracket 6 along the direction from the second cavity A2 to the first cavity A1 .

[0063] In some embodiments, the high-temperature-resistant partition plate 4 has a first preset melting point, and the insulating partition plate 10 has a second preset melting point, the first preset melting point being greater than the second preset melting point. By setting the first preset melting point to be greater than the second preset melting point, the high-temperature-resistant partition plate 4 will not melt or deform under the action of the flame, maintaining its heat insulation performance, while the insulating partition plate 10 melts under the action of the flame to reduce the resistance to the fire extinguishing agent, thereby improving the fire extinguishing effect.

[0064] In some embodiments, the high-temperature-resistant partition plate 4 includes but is not limited to a mica plate.

[0065] In some embodiments, the insulating partition plate 10 includes but is not limited to a plastic plate, and specifically, in some embodiments, the insulating partition plate 10 is a polycarbonate plate.

[0066] In some embodiments, the insulating partition plate 10 covers the fourth through hole 61. Covering the fourth through hole 61 with the insulating partition plate 10 helps reduce the risk of foreign matter entering the battery cell 21 through the fourth through hole 61 and the first through hole 41 via the explosion-proof valve 2111. When the battery cell 21 fails, the high-temperature gas and flame released through the explosion-proof valve 2111 enter the fourth through hole 61, causing the portion of the insulating partition plate 10 covering the fourth through hole 61 to melt and form a passage for the flame to pass through.

[0067] In some embodiments, the battery pack 1000 includes a temperature sensing wire 31, one end of the temperature sensing wire 31 being connected to the fire-fighting device 3, the temperature sensing wire 31 being used to sense the temperature of the battery pack 1000 and trigger the fire-fighting device 3 when the temperature of the battery pack 1000 reaches a threshold value. The temperature sensing wire 31 can be made of a thermocouple, a thermistor, or a plurality of temperature-sensitive elements distributed along the length of the cable, etc. When the temperature sensing wire 31 senses a high temperature caused by a failure of the battery cell 21, the fire-fighting device 3 is triggered to release the fire extinguishing agent into the second cavity A2.

[0068] In some embodiments, the temperature sensing wire 31 is laid on the surface of the insulating partition plate 10 facing away from the high-temperature-resistant partition plate 4.

[0069] In some embodiments, the battery pack 1000 includes a control unit 9, the control unit 9 being used to connect to the management unit of the energy storage system, the fire-fighting device 3 being provided with a temperature switch, the control unit 9 being electrically connected to the temperature switch, and the temperature switch being used to transmit an electrical signal to the control unit 9 when the temperature reaches a threshold value.

[0070] In some embodiments, the control unit 9 is fixed to the surface of the front wall 11 facing away from the rear wall 12.

[0071] In some embodiments, the control unit 9 feeds back the electrical signal to the management unit of the energy storage system, the management unit records this event and takes other preset protection actions to further protect the safety of the energy storage system.

[0072] Based on the same inventive concept, the application also provides a battery pack 1000.

[0073] The above is only an embodiment of the application, and does not limit the patent scope of the application. Any equivalent structure or equivalent process transformation using the content of the application specification and drawings, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the application.

Claims

1. A battery pack, characterized in that: include: The housing is provided with a receiving cavity; A plurality of battery cells, each comprising a housing, wherein a first end of the housing is provided with an explosion-proof valve; a high-temperature resistant baffle disposed in the accommodating cavity, the high-temperature resistant baffle dividing the accommodating cavity into a first cavity and a second cavity, the housing being disposed in the first cavity, the high-temperature resistant baffle being provided with first through holes corresponding one to one with the explosion-proof valves, the first end of the housing being disposed toward the baffle, the first through holes being used to connect the explosion-proof valve with the second cavity when the explosion-proof valve is opened; The fire-fighting device is arranged in the second cavity and is used for releasing a fire-extinguishing agent into the second cavity.

2. The battery pack according to claim 1, wherein: The battery cell includes a first pole and a second pole, wherein the first pole and the second pole are arranged at the first end of the shell; The high temperature resistant partition is provided with a second through hole and a third through hole corresponding to the first pole and the second pole respectively. Along the direction from the first cavity to the second cavity, a first pole is passed through a second through hole, and a second pole is passed through a third through hole.

3. The battery pack according to claim 2, wherein: The battery pack includes an insulating bracket, which is arranged on the side of the high-temperature resistant partition facing away from the outer shell. The insulating bracket is provided with a fourth through hole, a fifth through hole and a sixth through hole corresponding to the first through hole, the second through hole and the third through hole respectively. Along the direction from the first cavity to the second cavity, the fourth through hole is connected to the first through hole, the fifth through hole is connected to the second through hole, and the sixth through hole is connected to the third through hole.

4. The battery pack according to claim 3, characterized in that: The battery pack includes a plurality of busbars, the insulating bracket is provided with receiving grooves corresponding to the busbars one by one, one busbar is arranged in one receiving groove, and the fifth through hole and the sixth through hole are located at the bottom of the receiving groove; The end of the first pole away from the shell passes through the second through hole and the fifth through hole in sequence and then is connected to the busbar, and the end of the second pole away from the shell passes through the third through hole and the sixth through hole in sequence and then is connected to the busbar.

5. The battery pack according to claim 3, characterized in that: The battery pack includes an insulating partition, which is arranged on a side of the insulating bracket facing away from the high-temperature resistant partition; The high temperature resistant partition has a first preset melting point, and the insulating partition has a second preset melting point, and the first preset melting point is greater than the second preset melting point.

6. The battery pack according to claim 5, characterized in that: The insulating partition covers the fourth through hole.

7. The battery pack according to claim 1, wherein: The battery pack includes a temperature sensing line, one end of which is connected to the fire-fighting device. The temperature sensing line is used to sense the temperature of the battery pack and trigger the fire-fighting device when the temperature of the battery pack reaches a threshold.

8. The battery pack according to claim 1, wherein: The battery pack includes a control unit, which is used to connect to the management unit of the energy storage system. The fire-fighting device is provided with a temperature switch, and the control unit is electrically connected to the temperature switch. The temperature switch is used to transmit an electrical signal to the control unit when the temperature reaches a threshold.

9. The battery pack according to claim 1, wherein: The shell is provided with a heat dissipation hole, and the heat dissipation hole connects the first cavity with the outside.

10. An energy storage system, characterized in that: Comprising a battery pack as described in any one of claims 1 to 9.

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