A battery pack and energy storage system

Abstract

A battery pack and an energy storage system, the shell of the battery pack comprises a battery compartment and an electrical compartment arranged adjacent along the length direction. The battery compartment is used to accommodate a battery module. The battery module comprises a plurality of battery cells, the battery cell comprises a top surface and a bottom surface arranged opposite along the height direction, and the top surface is provided with two polar columns. The battery cell is also provided with an explosion-proof valve, and the explosion-proof valve is located on the top surface or the bottom surface. The electrical compartment is used to accommodate a power module. In the battery cell close to the electrical compartment, a barrier band is arranged between the surface where the explosion-proof valve is located and the inner wall of the shell. The barrier band is located on the side of the explosion-proof valve facing the electrical compartment, and is used to isolate the explosion-proof valve and the power module. In the battery pack, the battery module and the power module are accommodated in the same space. When the internal pressure of the battery cell is too high, the explosion-proof valve is opened to release high-temperature gas and liquid. The barrier band is located between the explosion-proof valve and the electrical compartment, which can prevent the high-temperature gas and liquid from entering the electrical compartment, and realize the electrical isolation of the battery pack.

Description

Battery pack and energy storage system

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on February 2, 2024, with application number 202420265579.3 and application name “A Battery Pack and Energy Storage System”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of energy storage technology, and in particular to a battery pack and an energy storage system. Background Art

[0004] The energy storage battery pack includes a battery module and a power control output module. Since the battery module and the power control output module need to be connected through a wiring harness to realize the function of the battery pack. At present, in order to facilitate the layout and connection of the wiring harness, the battery module and the power control output module are usually arranged in the same space. When the battery cell in the battery module experiences thermal runaway, the battery cell will spray high-temperature gas and electrolyte through the explosion-proof valve on its top. However, since the battery module and the power control output module are located in the same space, the high-temperature gas and electrolyte will directly invade the power control output module, greatly increasing the risk of short circuit, high-voltage ignition, and even explosion of the battery pack.

[0005] Summary of the Invention

[0006] The present application provides a battery pack and an energy storage system to isolate the explosion-proof valve of the power module and the battery cell, thereby achieving electrical isolation of the battery pack and reducing the risks of short circuit and explosion of the battery pack.

[0007] In a first aspect, the present application provides a battery pack. The battery pack specifically includes an outer shell. The interior space of the outer shell may include a battery compartment and an electrical compartment, which are adjacently arranged along the length of the outer shell. The battery compartment houses a battery module. The battery module includes multiple battery cells, each of which includes a top surface and a bottom surface arranged opposite each other along the height of the outer shell, with two terminals disposed on the top surface. In addition, each battery cell is provided with an explosion-proof valve, located on either the top or bottom surface. The electrical compartment houses a power module. In the battery cells closest to the electrical compartment, a barrier strip is provided between the surface where the explosion-proof valve is located and the inner wall of the outer shell. The barrier strip is located on the side of the explosion-proof valve facing the electrical compartment and isolates the explosion-proof valve from the power module. In the battery pack of the present application, the battery module and the power module are housed together within the outer shell, and the battery module is connected to the power module via a wiring harness. Each battery cell is provided with an explosion-proof valve. When the internal pressure of the battery cell is too high, the explosion-proof valve opens, releasing gas inside the battery cell to prevent explosion. The barrier strip is located between the explosion-proof valve and the electrical compartment, which can isolate the explosion-proof valve and the power module, thereby preventing the high-temperature gas and liquid ejected when the explosion-proof valve is opened from entering the electrical compartment without increasing the volume of the battery pack, thereby achieving electrical isolation of the battery pack.

[0008] In one possible implementation, the thickness of the barrier tape along the height of the housing is equal to the distance between the surface where the explosion-proof valve is located and the inner wall of the housing. Thus, the barrier tape fills the gap between this surface and the housing, achieving structural electrical isolation. For example, when the explosion-proof valve is located on the top surface of the battery cell, the thickness of the barrier tape is equal to the distance between the top surface of the battery cell and the inner top wall of the housing. When the explosion-proof valve is located on the bottom surface of the battery cell, the thickness of the barrier tape is equal to the distance between the bottom surface of the battery cell and the inner bottom wall of the housing.

[0009] The specific number of barrier strips in the present application is not limited, and the barrier strips may be one or more. In one possible implementation, the barrier strip extends along the width of the housing. There may be one barrier strip. Along this width, the length of the barrier strip is greater than the width of the battery module. In this way, after the battery pack is assembled, the ends of the barrier strip can fill the gap between the top of the battery module side wall and the inner side wall of the housing, thereby preventing high-temperature gas and liquid from entering the electrical compartment through the gap between the battery module and the inner side wall.

[0010] In the above battery pack, the difference between the length of the barrier tape and the width of the battery module is 1-2 mm to avoid the barrier tape being too long and inconvenient for assembly.

[0011] In a possible implementation, the barrier strips of the present application may also be at least two. Specifically, the above-mentioned multiple battery cells include at least two battery cells close to the electrical compartment, and the at least two battery cells are arranged in sequence along the width direction of the shell. The above-mentioned at least two barrier strips are arranged relative to the number of the at least two battery cells and in a one-to-one correspondence. In this implementation, the specific number of barrier strips can be set according to the number of battery cells arranged along the width direction, and corresponding to each battery cell, the barrier strip can isolate the explosion-proof valve and the power module of the battery cell. Along the width direction, the spacing between two adjacent barrier strips of the above-mentioned at least two barrier strips is less than or equal to the spacing between two adjacent battery cells of the above-mentioned at least two battery cells, thereby reducing the risk of high-temperature gas and liquid invading the electrical compartment from between two adjacent battery cells.

[0012] The specific location of the explosion-proof valve on the battery cell of this application is not limited. In one possible implementation, the explosion-proof valve is located on the top surface of the battery cell and between two poles. The two poles and the explosion-proof valve can be arranged sequentially along the width of the housing, or the two poles and the explosion-proof valve can be arranged sequentially along the length of the housing.

[0013] In the above-mentioned battery pack, the aforementioned multiple battery cells may include at least two battery cells close to the electrical compartment, and the at least two battery cells are arranged in sequence along the width direction of the shell. Among the at least two battery cells, an isolation belt is provided between two adjacent battery cells. Particularly, along the width direction of the shell, the thickness of the isolation belt is equal to the spacing between the two battery cells, so that the isolation belt can fill the gap between the two adjacent battery cells to prevent the high-temperature gas and liquid ejected from the explosion-proof valve from flowing into the electrical compartment from between the two battery cells. Along the height direction of the shell, the height of the isolation belt can be greater than or equal to the distance between the top and bottom surfaces of the battery cell. In other words, the isolation belt can extend from the top surface to the bottom surface of the battery cell, further ensuring that high-temperature gas and liquid will not flow between two adjacent battery cells.

[0014] In one possible implementation, the isolation band extends from the top surface of the battery cell in the direction of the height of the housing, away from the bottom surface of the battery cell. On the side of the top surface of the battery cell near the terminal, the distance between the end of the isolation band away from the bottom surface and the top surface is greater than the height of the terminal. In other words, the height of the isolation band can be greater than the height of the terminal, further ensuring that high-temperature gas and liquid do not flow between adjacent battery cells.

[0015] In one possible implementation, the difference between the distance between the end of the isolation strip away from the bottom surface and the top surface and the height of the pole is 1-2 mm, thereby preventing the isolation strip from being too high and affecting the assembly of the battery module.

[0016] In practice, to ensure insulation between the terminals and the outer casing, the battery module also includes an insulating film. This film is used to insulate the terminals of the battery cells from the outer casing. The insulating film covers both terminals of each battery cell. For the cells closest to the electrical compartment, the insulating film is at least partially located between the barrier tape and the battery cell. In other words, the barrier tape is located on the side of the insulating film facing the inner wall of the outer casing.

[0017] In another possible implementation, the explosion-proof valve can also be located on the bottom surface of the battery cell. In this way, the two poles and the explosion-proof valve are located on both sides of the battery cell, and the high-temperature gas and liquid ejected by the explosion-proof valve will not enter the electrical compartment due to the barrier tape.

[0018] In one possible implementation, the battery pack may also include a barrier plate. This barrier plate may be positioned on the side of the battery module facing the electrical compartment. Along the width of the housing, the barrier plate's length should be greater than or equal to the width of the battery module. This barrier plate can effectively separate the battery module from the electrical compartment, further enhancing the safety of the battery pack.

[0019] In one possible implementation, the housing is also equipped with an explosion vent that opens when the air pressure inside the battery pack is too high, thereby releasing the gas inside the battery pack and preventing the battery pack from exploding. The explosion vent is located on the side wall of the battery compartment facing away from the electrical compartment. When the explosion vent is opened, the barrier tape prevents the high-temperature gas and liquid ejected from the battery cells from flowing toward the electrical compartment. Therefore, the high-temperature gas and liquid flow in the opposite direction and out of the explosion vent, thereby improving the safety of the battery pack.

[0020] In a second aspect, the present application provides an energy storage system. The energy storage system includes a battery pack and a power converter according to the first aspect. The power converter is configured to convert electrical energy from an external power source and output it to the battery pack. The battery pack of the energy storage system of the present application can achieve electrical isolation, reducing the risks of short circuits and explosions, thereby improving the safety of the energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG1 is a schematic diagram of a battery pack provided in an embodiment of the present application;

[0022] FIG2 is another schematic diagram of a battery pack provided in an embodiment of the present application;

[0023] FIG3 is another schematic diagram of a battery pack provided in an embodiment of the present application;

[0024] FIG4 is another schematic diagram of a battery pack provided in an embodiment of the present application;

[0025] FIG5 is a schematic diagram of a battery cell provided in an embodiment of the present application;

[0026] FIG6 is another schematic diagram of a battery pack provided in an embodiment of the present application;

[0027] FIG7 is a schematic diagram of a battery module provided in an embodiment of the present application;

[0028] FIG8 is another schematic diagram of a battery module provided in an embodiment of the present application;

[0029] FIG9 is another schematic diagram of a battery module provided in an embodiment of the present application;

[0030] FIG10 is a schematic diagram of a battery pack provided in an embodiment of the present application.

[0031] Reference numerals:

[0032] 10-Battery Pack

[0033] 11- Shell

[0034] 12-Battery Module

[0035] 13-Power Module

[0036] 14-Barrier tape

[0037] 15-Isolation belt

[0038] 111-Battery compartment

[0039] 112-Electrical Warehouse

[0040] 113-Explosion vent

[0041] 121-battery cell

[0042] 122-Insulation film

[0043] 1211-Explosion-proof Valve

[0044] 1212-Pole DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solutions and advantages of this application clearer, this application will be further described in detail below with reference to the accompanying drawings.

[0046] It should be noted that the terms used in the following embodiments are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification and claims of this application, the singular expressions "a," "an," "said," "above," "the," and "this" are intended to include expressions such as "one or more," unless the context clearly indicates otherwise.

[0047] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in yet other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0048] To facilitate understanding of the battery pack and energy storage system provided in the embodiments of the present application, their application scenarios are described below. The energy storage system of the present application can be used in multiple application scenarios, including industrial and commercial energy storage and power station energy storage. Industrial and commercial energy storage may include, for example, small-scale industrial and commercial (such as small factories), medium-sized industrial and commercial energy storage, large-scale industrial and commercial energy storage, photovoltaic storage and charging station energy storage, and small and medium-sized microgrid (such as island) energy storage. Power station energy storage may include, for example, wind and solar storage stations, grid storage stations, and large microgrid stations. In addition, energy storage equipment can also be used in application scenarios such as data centers and vehicle charging stations. The energy storage equipment contains a power converter and at least one battery pack. The power converter is used to convert electrical energy output from an external power source and output it to the at least one battery pack. The battery pack may include a housing that houses a power module and at least one battery cell. In the present application, the battery cell is provided with an explosion-proof valve. When the internal gas pressure of the battery cell is too high, the explosion-proof valve opens, allowing the release of high-temperature gas and electrolyte from the explosion-proof valve to prevent the battery cell from exploding.

[0049] However, when the power module and the battery cell are in the same space, when the explosion-proof valve vents the battery cell, the sprayed high-temperature gas and electrolyte may invade the power module, causing the battery pack to short-circuit, ignite, or even explode.

[0050] Therefore, the present application provides a battery pack and an energy storage system to isolate the explosion-proof valve of the power module and the battery cell, thereby achieving electrical isolation of the battery pack and reducing the risks of short circuit and explosion of the battery pack.

[0051] Figure 1 is a schematic diagram of a battery pack provided in an embodiment of the present application. As shown in Figure 1, the battery pack 10 includes a shell 11. The internal space of the shell 11 may include a battery compartment 111 and an electrical compartment 112, and the battery compartment 111 and the electrical compartment 112 are adjacently arranged along the length direction L of the shell 11. It should be noted that the battery compartment 111 is connected to the electrical compartment 112, and the dotted line in Figure 1 only illustrates the positional relationship between the electrical compartment 112 and the battery compartment 111, and does not structurally separate the battery compartment 111 and the electrical compartment 112. Among them, the battery compartment 111 is used to accommodate a battery module. The electrical compartment 112 is used to accommodate a power module, and the power module may include high-voltage devices, low-voltage devices, cables and other power devices. The battery module and the power module are connected by a wiring harness.

[0052] FIG2 is another schematic diagram of a battery pack provided in an embodiment of the present application, wherein the outer shell is omitted in FIG2 . As shown in FIG2 , in the battery compartment 111 , the battery module 12 may include a plurality of battery cells 121 . These battery cells 121 may include at least one group of battery cells 121 sequentially arranged along the length direction L of the outer shell 11 , and the at least one group of battery cells 121 may include at least one battery cell 121 sequentially arranged along the width direction W of the outer shell 11 . Alternatively, these battery cells 121 may include at least one group of battery cells 121 sequentially arranged along the width direction W of the outer shell 11 , and the at least one group of battery cells 121 may include at least one battery cell 121 sequentially arranged along the length direction L of the outer shell 11 . That is, the battery module 12 of the present application may include a row of battery cells 121 sequentially arranged along the length direction L of the outer shell 11 , or may include a column of battery cells 121 sequentially arranged along the width direction W of the outer shell 11 , or may include a plurality of battery cells 121 distributed in an array. In the battery module 12 , each battery cell 121 may include a top surface and a bottom surface that are oppositely disposed along a height direction H of the housing 11 , wherein the top surface is provided with two poles.

[0053] In the present application, the battery cell 121 can be a square battery cell, which also includes four side surfaces connected in sequence. The four side surfaces are vertically connected between the top surface and the bottom surface. The four side surfaces include two first side surfaces that are relatively arranged along the length direction L of the outer shell 11, and two second side surfaces that are relatively arranged along the width direction W of the outer shell 11. In actual applications, the area of ​​the first side surface can be larger than the area of ​​the second side surface, that is, the first side surface is the large surface of the battery cell 121, and the large surface of the battery cell 121 is arranged toward the electrical compartment 112. Alternatively, the area of ​​the first side surface can also be smaller than the area of ​​the second side surface, that is, the second side surface is the large surface of the battery cell 121. Of course, the shape of the battery cell 121 can also be cylindrical or other shapes, which is not limited in this application.

[0054] Please continue to refer to Figure 2. Each of the above-mentioned battery cells 121 is also provided with an explosion-proof valve 1211, and the explosion-proof valve 1211 can be provided on the top surface or the bottom surface of the battery cell 121. In the battery cell 121 close to the electrical compartment of the above-mentioned multiple battery cells 121, a barrier strip 14 is provided between the surface where the explosion-proof valve 1211 is located and the inner wall of the outer shell 11. The barrier strip 14 is located on the side of the explosion-proof valve 1211 facing the electrical compartment 112, and the barrier strip 14 is used to isolate the explosion-proof valve 1211 from the power module 13. In the battery pack 10 of the present application, the battery module 12 and the power module 13 are accommodated together in the outer shell 11, and the battery module 12 is connected to the power module 13 through a wiring harness. Each battery cell 121 is provided with an explosion-proof valve 1211, which opens when the gas pressure inside the battery cell 121 is too high, thereby releasing the gas inside the battery cell 121 to prevent the battery cell 121 from exploding. The barrier strip 14 is located between the explosion-proof valve 1211 and the electrical compartment 112, which can isolate the explosion-proof valve 1211 and the power module 13, thereby preventing the high-temperature gas and liquid ejected when the explosion-proof valve 1211 is opened from entering the electrical compartment 112 without increasing the volume of the battery pack 10, thereby achieving electrical isolation of the battery pack 10.

[0055] In the above embodiment, the barrier tape 14 can be made of insulating, high temperature resistant, flame retardant, and compressible materials to effectively block high temperature gases and liquids. For example, the barrier tape 14 can be a high temperature and heat resistant silicone barrier tape or rubber barrier tape.

[0056] FIG3 is another schematic diagram of a battery pack according to an embodiment of the present application. As shown in FIG3 , along the height direction H of the outer shell 11, the thickness h of the barrier tape 14 is equal to the distance between the surface where the explosion-proof valve 1211 is located and the inner wall of the outer shell 11. In this way, the barrier tape 14 fills the gap between the surface and the inner wall, thereby structurally isolating the battery compartment 111 from the electrical compartment 112. Before assembling the battery pack 10, the thickness of the barrier tape 14 can be greater than the distance between the surface where the explosion-proof valve 1211 is located and the inner wall of the outer shell 11. The barrier tape 14 is a compressible barrier tape. Therefore, when the battery pack 10 is assembled, the inner wall of the outer shell 11 and the battery cell 121 squeeze the barrier tape 14, causing the barrier tape 14 to fill the gap.

[0057] The specific number of the barrier tape 14 of the present application is not limited and can be one or more. In one embodiment, the barrier tape 14 extends along the width direction W of the outer shell 11. The barrier tape 14 can be one. Along the width direction W, the length d of the barrier tape 14 is greater than the width D of the battery module 12. In this way, after the battery pack 10 is assembled, the barrier tape 14 is set along the gap between the top of the battery module 12 and the outer shell 11, and the two ends of the barrier tape 14 can respectively extend into the gap between the side wall of the battery module 12 and the inner wall of the outer shell 11. The barrier tape 14 at least fills the top of the gap to prevent high-temperature gas and liquid from entering the electrical compartment 112 from the gap between the battery module 12 and the inner wall of the outer shell 11. In this embodiment, along the width direction W, the difference between the length d of the barrier tape 14 and the width D of the battery compartment 111 is 1-2 mm to avoid the barrier tape 14 being too long and inconvenient to assemble.

[0058] FIG4 is another schematic diagram of a battery pack provided in an embodiment of the present application. As shown in FIG4 , there may be at least two barrier strips 14, and the at least two barrier strips 14 may be arranged at intervals. The plurality of battery cells 121 include at least two battery cells 121 adjacent to the electrical compartment 112, and the at least two battery cells 121 are arranged in sequence along the width direction W of the outer shell 11. The at least two barrier strips 14 are arranged relative to the number of the at least two battery cells 121 and in a one-to-one correspondence. Along the width direction W, the spacing between two adjacent barrier strips 14 of the at least two barrier strips 14 is less than or equal to the spacing between two adjacent battery cells 121 of the at least two battery cells 121. In this implementation, the specific number of barrier strips 14 can be set according to the number of battery cells 121 arranged along the width direction W, and corresponding to each battery cell 121, the barrier strip 14 can isolate the explosion-proof valve 1211 of the battery cell 121 from the power module 13.

[0059] The specific location of the explosion-proof valve 1211 on the battery cell 121 of the present application is not limited. Figure 5 is a schematic diagram of a battery cell provided by an embodiment of the present application. As shown in Figure 5, in one embodiment, the explosion-proof valve 1211 is located on the top surface and is located between two poles 1212. The two poles 1212 and the explosion-proof valve 1211 can be arranged sequentially along the width direction W of the housing 11, or the two poles 1212 and the explosion-proof valve 1211 can be arranged sequentially along the length direction of the housing 11.

[0060] Figure 6 is another schematic diagram of a battery pack according to an embodiment of the present application, and Figure 7 is a schematic diagram of a battery module according to an embodiment of the present application, with Figure 7 showing a left side view of the battery module shown in Figure 2. As shown in Figures 6 and 7, in the battery pack 10, the plurality of battery cells 121 may include at least two battery cells 121 located adjacent to the electrical compartment 112. These at least two battery cells 121 are arranged sequentially along the width direction W of the outer shell 11. A separator 15 is provided between adjacent battery cells 121. Along the width direction W of the outer shell 11, the thickness of the separator 15 is equal to the distance between the two battery cells 121. This ensures that the separator 15 fills the gap between adjacent battery cells 121, preventing high-temperature gas and liquid ejected from the explosion-proof valve 1211 from flowing into the electrical compartment 112 from between adjacent battery cells 121. Along the height direction H of the outer shell 11, the height of the separator 15 may be greater than or equal to the distance between the top and bottom surfaces of the battery cells 121. That is, the isolation tape 15 may extend from the top surface to the bottom surface of the battery cell 121 , further ensuring that high-temperature gas and liquid do not flow between two adjacent battery cells 121 .

[0061] In one embodiment, in the height direction H of the housing 11, the isolation strip 15 extends from the top surface of the battery cell 121 in a direction away from the bottom surface of the battery cell 121. On the side of the top surface of the battery cell 121 near the terminal 1212, the distance between the end of the isolation strip 15 away from the bottom surface and the top surface is greater than the height of the terminal 1212. In other words, the height of the isolation strip 15 can be greater than the height of the terminal 1212, further ensuring that high-temperature gas and liquid do not flow between adjacent battery cells 121.

[0062] In one embodiment, the difference between the distance between the end of the isolation strip 15 away from the bottom surface and the top surface and the height of the pole 1212 is 1-2 mm, thereby preventing the isolation strip 15 from being too high and affecting the assembly of the battery module 12.

[0063] In actual application, in order to ensure that the pole 1212 is insulated from the outer shell 11, the battery module 12 also includes an insulating film 122. The insulating film 122 covers the two poles 1212 of each battery cell 121. In the battery cell 121 close to the electrical compartment 112 of the above-mentioned multiple battery cells 121, the insulating film 122 is at least partially located between the barrier tape 14 and the battery cell 121. That is, the barrier tape 14 is located on the side of the insulating film 122 facing the inner wall of the outer shell 11. Figure 8 is another schematic diagram of the battery module provided by an embodiment of the present application. As shown in Figure 8, in one embodiment, in each battery cell 121, the explosion-proof valve 1211 and the two poles 1212 are arranged in sequence on the top surface along the width direction W of the outer shell 11, and the explosion-proof valve 1211 is located between the two poles 1212. Two insulating films 122 are provided on the top surface of each battery cell 121, and the two insulating films 122 extend along the length direction L of the outer shell 11. That is to say, among the multiple battery cells 121 arranged along the length direction L of the outer shell 11, the poles 1212 adjacent to each other along the length direction L are covered with the same insulating film 122. Therefore, the side of these insulating films 122 close to the electrical compartment 112 can be located between the barrier strip 14 and the top surface. Figure 9 is another schematic diagram of the battery module provided in an embodiment of the present application. As shown in Figure 9, in another embodiment, in each battery cell 121, the explosion-proof valve 1211 and the two poles 1212 are arranged in sequence on the top surface along the length direction L of the outer shell 11, and the explosion-proof valve 1211 is located between the two poles 1212. Two insulating films 122 are provided on the top surface of each battery cell 121, and the two insulating films 122 extend along the width direction W of the outer shell 11. That is to say, among the multiple battery cells 121 arranged along the width direction W of the outer shell 11, the poles 1212 adjacent to each other in width along the length direction L are covered with the same insulating film 122. Furthermore, the portion of the insulating film 122 closest to the electrical compartment 112 may be located between the barrier tape 14 and the top surface.

[0064] In another embodiment, the explosion-proof valve 1211 may also be located on the bottom surface of the battery cell 121. In this way, the two poles 1212 and the explosion-proof valve 1211 are located on both sides of the battery cell 121, and the high-temperature gas and liquid ejected from the explosion-proof valve 1211 will not enter the electrical compartment 112 due to the action of the barrier tape 14.

[0065] In one embodiment, the battery pack 10 may further include a barrier plate. The barrier plate may be positioned on the side of the battery module 12 facing the electrical compartment 112. Along the width W of the housing 11, the barrier plate's length is greater than or equal to the width of the battery module 12. This barrier plate effectively separates the battery module 12 from the electrical compartment 112, further enhancing the safety of the battery pack 10.

[0066] Figure 10 is a schematic diagram of a battery pack provided in an embodiment of the present application. As shown in Figure 10, in one embodiment, the outer shell 11 is further provided with an explosion vent 113, which opens when the air pressure inside the battery pack 10 is too high, thereby releasing the gas inside the battery pack 10 and preventing the battery pack 10 from exploding. The explosion vent 113 is located at one end of the battery compartment 111 away from the electrical compartment 112. When the explosion vent 113 is opened, since the barrier tape 14 can block the high-temperature gas and liquid ejected from the battery cell 121 from flowing toward the electrical compartment 112, the high-temperature gas and liquid flow in the opposite direction and flow out from the explosion vent 113, thereby improving the safety of the battery pack 10. In this embodiment, the explosion vent 113 can be located on the side wall or bottom wall of the outer shell 11.

[0067] The above are only specific embodiments of the present application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A battery pack, characterized in that: The invention comprises a shell, wherein the interior space of the shell comprises a battery compartment and an electrical compartment adjacently arranged along the length direction of the shell; the battery compartment is used to accommodate a battery module, the battery module comprises a plurality of battery cells, each of the plurality of battery cells comprises a top surface and a bottom surface oppositely arranged along the height direction of the shell, the top surface being provided with two poles; each battery cell is further provided with an explosion-proof valve, the explosion-proof valve being located on the top surface or the bottom surface; the electrical compartment is used to accommodate a power module; In the battery cells of the multiple battery cells close to the electrical compartment, a barrier strip is provided between the surface where the explosion-proof valve is located and the inner wall of the outer shell. The barrier strip is located on the side of the explosion-proof valve facing the electrical compartment, and the barrier strip is used to isolate the explosion-proof valve from the power module.

2. The battery pack according to claim 1, wherein: Along the height direction, the thickness of the barrier strip is equal to the distance between the surface where the explosion-proof valve is located and the inner wall of the shell.

3. The battery pack according to claim 1 or 2, wherein: The barrier strip extends along the width direction of the housing; Along the width direction, the length of the barrier tape is greater than the width of the battery module.

4. The battery pack according to claim 3, wherein: Along the width direction, the difference between the length of the barrier tape and the width of the battery module is 1-2 mm.

5. The battery pack according to claim 1 or 2, wherein: The plurality of battery cells include at least two battery cells close to the electrical compartment, and the at least two battery cells are arranged sequentially along the width direction of the housing; There are at least two barrier strips, and the number of at least two barrier strips is equal to that of the at least two battery cells and they are arranged in a one-to-one correspondence; along the width direction, the spacing between two adjacent barrier strips in the at least two barrier strips is less than or equal to the spacing between two adjacent battery cells in the at least two battery cells.

6. The battery pack according to any one of claims 1 to 5, wherein: The explosion-proof valve is located on the top surface and between the two poles; the two poles and the explosion-proof valve are sequentially arranged along the width direction or the length direction of the shell.

7. The battery pack according to claim 6, wherein: The plurality of battery cells include at least two battery cells close to the electrical compartment, the at least two battery cells are arranged sequentially along the width direction of the housing, and an isolation strip is provided between two adjacent battery cells of the at least two battery cells; Along the width direction, the thickness of the isolation tape is equal to the distance between the two battery cells; Along the height direction, the height of the isolation zone is greater than or equal to the distance between the top surface and the bottom surface of the battery cell.

8. The battery pack according to claim 7, wherein: In the height direction, the isolation zone extends out of the top surface in a direction away from the bottom surface; on the side of the top surface close to the pole, the distance between the end of the isolation zone away from the bottom surface and the top surface is greater than the height of the pole.

9. The battery pack according to claim 8, wherein: The difference between the distance between the end of the isolation zone away from the bottom surface and the top surface and the height of the pole is 1-2 mm.

10. The battery pack according to any one of claims 6 to 9, wherein: The battery module also includes an insulating film, which covers the two poles of each battery cell; in the battery cells close to the electrical compartment among the multiple battery cells, the insulating film is at least partially located between the barrier tape and the battery cell.

11. The battery pack according to any one of claims 1 to 10, wherein: The battery pack further includes a baffle plate, which is located on a side of the battery module facing the electrical compartment; along the width direction of the housing, the length of the baffle plate is greater than or equal to the width of the battery module.

12. The battery pack according to any one of claims 1 to 11, wherein: The shell is provided with an explosion vent, and the explosion vent is located on the side wall of the battery compartment away from the electrical compartment.

13. An energy storage system, characterized in that: The energy storage system includes a battery pack and a power converter according to any one of claims 1 to 12, wherein the power converter is used to convert the electric energy output by an external power source and output the converted electric energy to the battery pack.

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