Battery pack and energy storage system

Abstract

The utility model provides a battery pack and an energy storage system. A shell of the battery pack comprises a battery bin and an electrical bin which are adjacently arranged in the length direction. The battery compartment is used for accommodating a battery module. The battery module comprises a plurality of battery cells, each battery cell comprises a top surface and a bottom surface which are oppositely arranged along the height direction, and the top surface is provided with two pole columns. And the battery cell is also provided with an anti-explosion valve which is positioned on the top surface or the bottom surface. The electrical cabin is used for accommodating the power module. And a barrier belt is arranged between the surface where the anti-explosion valve is located and the inner wall of the shell in the battery core, close to the electrical cabin, in the battery module. The blocking belt is located on the side, facing the electrical bin, of the anti-explosion valve and used for isolating the anti-explosion valve and the power module. In the battery pack, the battery module and the power module are accommodated in the same space. And when the internal air pressure of the battery cell is too high, the anti-explosion valve is opened to release high-temperature gas and liquid. The barrier belt is located between the anti-explosion valve and the electrical bin, high-temperature gas and liquid can be prevented from entering the electrical bin, and electrical isolation of the battery pack is achieved.

Description

Technical Field

[0001] 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

[0002] The energy storage battery pack includes a battery module and a power control output module. The battery module and the power control output module need to be connected through a wiring harness to realize the functions 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 has thermal runaway, the battery cell will spray high-temperature gas and electrolyte through the explosion-proof valve on the top of the cell. 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. Utility Model Content

[0003] 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.

[0004] In the first aspect, the present application provides a battery pack. The battery pack specifically includes a shell. The internal space of the shell may include a battery compartment and an electrical compartment, and the battery compartment and the electrical compartment are adjacently arranged along the length direction of the shell. Among them, the battery compartment is used to accommodate a battery module. The battery module includes a plurality of battery cells, and each of the aforementioned plurality of battery cells includes a top surface and a bottom surface arranged relatively along the height direction of the shell, wherein the top surface is provided with two poles. In addition, each of the aforementioned battery cells 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 among the aforementioned plurality of battery cells, a barrier strip is provided between the surface where the explosion-proof valve is located and the inner wall of the 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. In the battery pack of the present application, the battery module and the power module are accommodated together in the shell, and the battery module is connected to the power module through a wiring harness. Each battery cell is provided with an explosion-proof valve, and when the internal gas pressure of the battery cell is too high, the explosion-proof valve opens, thereby releasing the gas inside the battery cell to avoid the battery cell from exploding. 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 sprayed 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.

[0005] In a possible implementation, along the height direction of the shell, the thickness of the barrier tape is equal to the distance between the surface where the explosion-proof valve is located and the inner wall of the shell, so that the barrier tape fills the gap between the surface and the shell, and achieves electrical isolation from a structural perspective. 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 shell. 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 shell.

[0006] The specific number of barrier strips of the present application is not limited, and the barrier strips can be one or more. In a possible implementation, the barrier strip extends along the width direction of the shell. The barrier strip can be one. Along the width direction, 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 two ends of the barrier strip can fill the gap between the top of the side wall of the battery module and the inner side wall of the shell, thereby preventing high-temperature gas and liquid from entering the electrical compartment from the gap between the battery module and the inner side wall.

[0007] 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 to assemble.

[0008] In a possible implementation, there may be at least two barrier strips in the present application. Specifically, 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 in sequence along the width direction of the outer shell. The at least two barrier strips are arranged relative to the number of the at least two battery cells and correspond one to one. 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 at least two barrier strips is less than or equal to the spacing between two adjacent battery cells of the 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.

[0009] The specific position of the explosion-proof valve of the present application on the battery cell is not limited. In a possible implementation, the explosion-proof valve is located on the top surface of the battery cell, and the explosion-proof valve is located between two poles. The two poles and the explosion-proof valve can be arranged in sequence along the width direction of the shell, or the two poles and the explosion-proof valve can be arranged in sequence along the length direction of the shell.

[0010] 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 outer shell. Among the at least two battery cells, an isolation belt is arranged between two adjacent battery cells. Wherein, along the width direction of the outer 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 outer 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.

[0011] In a possible implementation, in the height direction of the housing, the isolation belt extends out of the top surface of the battery cell in a direction away from the bottom surface of the battery cell. On the side of the top surface of the battery cell close to the pole, the distance between the end of the isolation belt away from the bottom surface and the top surface is greater than the height of the pole. In other words, the height of the isolation belt can be greater than the height of the pole, further ensuring that high-temperature gas and liquid will not flow into between two adjacent battery cells.

[0012] In a possible implementation, the difference between the distance between the end of the isolation belt away from the bottom surface and the top surface and the height of the pole is 1-2 mm, thereby preventing the isolation belt from being too high and affecting the assembly of the battery module.

[0013] In actual application, in order to ensure the insulation between the pole and the shell, the battery module also includes an insulating film, which is used to insulate the pole of the battery cell from the shell. The insulating film covers the two poles of each battery cell. Among the above-mentioned multiple battery cells close to the electrical compartment, the insulating film is at least partially located between the barrier strip and the battery cell. In other words, the barrier strip is located on the side of the insulating film facing the inner wall of the shell.

[0014] In another possible implementation, the explosion-proof valve may also be located at the bottom 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 from the explosion-proof valve will not enter the electrical compartment under the action of the barrier tape.

[0015] In a possible implementation, the battery pack may further include a barrier plate. The barrier plate may be disposed on a side of the battery module facing the electrical compartment. Along the width direction of the housing, the length of the barrier plate is greater than or equal to the width of the battery module. In this way, the barrier plate may separate the battery module from the electrical compartment as a whole, further improving the safety of the battery pack.

[0016] In one possible implementation, the housing is also provided with an explosion vent, which opens when the gas 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 away from the electrical compartment. When the explosion vent is opened, since the barrier tape can block the high-temperature gas and liquid ejected from the battery cell from flowing toward the electrical compartment, the high-temperature gas and liquid flow in the opposite direction and flow out from the explosion vent, thereby improving the safety of the battery pack.

[0017] 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, wherein the power converter is used to convert the electric energy output by 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, so that the risks of short circuit and explosion of the battery pack are reduced, thereby improving the safety of the energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of a battery pack provided in an embodiment of the present application;

[0019] Figure 2 Another schematic diagram of a battery pack provided in an embodiment of the present application;

[0020] Figure 3 Another schematic diagram of a battery pack provided in an embodiment of the present application;

[0021] Figure 4 Another schematic diagram of a battery pack provided in an embodiment of the present application;

[0022] Figure 5 A schematic diagram of a battery cell provided in an embodiment of the present application;

[0023] Figure 6 Another schematic diagram of a battery pack provided in an embodiment of the present application;

[0024] Figure 7 A schematic diagram of a battery module provided in an embodiment of the present application;

[0025] Figure 8 Another schematic diagram of a battery module provided in an embodiment of the present application;

[0026] Fig. 9 Another schematic diagram of a battery module provided in an embodiment of the present application;

[0027] Fig.10 A schematic diagram of a battery pack provided in an embodiment of the present application.

[0028] Reference numerals:

[0029] 10-Battery Pack

[0030] 11- Shell

[0031] 12-Battery module

[0032] 13-Power module

[0033] 14-Barrier tape

[0034] 15-Isolation belt

[0035] 111-Battery compartment

[0036] 112-Electrical warehouse

[0037] 113-Explosion vent

[0038] 121-Battery Cell

[0039] 122-Insulation film

[0040] 1211-Explosion-proof valve

[0041] 1212-Pole DETAILED DESCRIPTION

[0042] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings.

[0043] 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 be limiting of the present application. As used in the specification and claims of the present application, the singular expressions "a", "an", "said", "above", "the" and "this" are intended to also include expressions such as "one or more", unless there is a clear indication to the contrary in the context.

[0044] References to "one embodiment" or "some embodiments" etc. described in this specification mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear at different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0045] In order to facilitate the understanding of the battery pack and energy storage system provided in the embodiment of the present application, the application scenarios are described below. The energy storage system of the present application can be used in multiple application scenarios of industrial and commercial energy storage and power station energy storage. Industrial and commercial energy storage may include, for example, small-scale industrial and commercial (small factories, etc.) energy storage, medium-sized industrial and commercial energy storage, large-scale industrial and commercial energy storage, light storage and charging station energy storage, small and medium-sized microgrid (island, etc.) energy storage, etc. Power station energy storage may include, for example, wind and solar storage power stations, power grid storage power stations, large microgrid power stations, etc. In addition, energy storage equipment can also be used in application scenarios such as data centers and vehicle charging stations. The energy storage device contains a power converter and at least one battery pack, and the power converter is used to convert the electric energy output by the external power supply and output it to the aforementioned at least one battery pack. The battery pack may include a housing, and the housing contains 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 air pressure of the battery cell is too high, the explosion-proof valve is opened, so that high-temperature gas and electrolyte can be released from the explosion-proof valve to avoid battery cell explosion.

[0046] However, when the power module and the battery cell are in the same space, when the explosion-proof valve is venting the battery cell, the sprayed high-temperature gas and electrolyte may invade the power module, causing the battery pack to have risks such as short circuit, ignition, or even explosion.

[0047] 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.

[0048] Figure 1 A schematic diagram of a battery pack provided in an embodiment of the present application. Figure 1 As shown, the battery pack 10 includes a housing 11. The internal space of the housing 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 housing 11. It should be noted that the battery compartment 111 is connected to the electrical compartment 112. Figure 1 The dotted line in the figure only indicates 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. The battery compartment 111 is used to accommodate the battery module. The electrical compartment 112 is used to accommodate the power module, which 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.

[0049] Figure 2 Another schematic diagram of a battery pack provided in an embodiment of the present application, wherein: Figure 2 Omit the outer shell. Figure 2As shown, 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 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 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 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 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 shell 11, or may include a column of battery cells 121 sequentially arranged along the width direction W of the 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 relatively arranged along the height direction H of the shell 11, wherein two poles are arranged on the top surface.

[0050] In the present application, the battery cell 121 may be a square battery cell, which further 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 relatively arranged along the length direction L of the outer shell 11, and two second side surfaces relatively arranged along the width direction W of the outer shell 11. In practical applications, the area of ​​the first side surface may be greater 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 may 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 may also be cylindrical or other shapes, which is not limited by the present application.

[0051] Please continue reading 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 arranged 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 arranged 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 is opened 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 , and can isolate the explosion-proof valve 1211 and the power module 13 , thereby preventing high-temperature gas and liquid sprayed out 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 .

[0052] 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 gas and liquid. For example, the barrier tape 14 can be a high temperature and heat resistant silicone barrier tape or a rubber barrier tape.

[0053] Figure 3 Another schematic diagram of a battery pack provided in an embodiment of the present application. Figure 3 As shown, 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, so that the barrier tape 14 fills the gap between the surface and the inner wall, thereby structurally isolating the battery compartment 111 and 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, and the barrier tape 14 is a compressible barrier tape. Therefore, when assembling the battery pack 10, the inner wall of the outer shell 11 and the battery cell 121 squeeze the barrier tape 14, so that the barrier tape 14 fills the gap.

[0054] 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 arranged 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, and 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.

[0055] Figure 4 Another schematic diagram of a battery pack provided in an embodiment of the present application. Figure 4 As shown, there may be at least two barrier strips 14, and the at least two barrier strips 14 may be arranged at intervals. The above-mentioned multiple battery cells 121 include at least two battery cells 121 close 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 above-mentioned at least two barrier strips 14 are arranged relative to the number of the at least two battery cells 121 and one-to-one. Along the width direction W, the spacing between two adjacent barrier strips 14 of the above-mentioned at least two barrier strips 14 is less than or equal to the spacing between two adjacent battery cells 121 of the above-mentioned 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.

[0056] The specific position of the explosion-proof valve 1211 of the present application on the battery cell 121 is not limited. Figure 5 A schematic diagram of a battery cell provided in an embodiment of the present application. Figure 5 As shown, in one embodiment, the explosion-proof valve 1211 is located on the top surface, and the explosion-proof valve 1211 is located between two poles 1212. The two poles 1212 and the explosion-proof valve 1211 can be arranged in sequence along the width direction W of the housing 11, or the two poles 1212 and the explosion-proof valve 1211 can be arranged in sequence along the length direction of the housing 11.

[0057] Figure 6 Another schematic diagram of a battery pack provided in an embodiment of the present application, Figure 7 A schematic diagram of a battery module provided in an embodiment of the present application, wherein: Figure 7 Show Figure 2 The left side view of the battery module. Figure 6and Figure 7 As shown, in the above-mentioned battery pack 10, the aforementioned multiple battery cells 121 may include at least two battery cells 121 close to the electrical compartment 112, and the at least two battery cells 121 are arranged in sequence along the width direction W of the shell 11. Among the at least two battery cells 121, an isolation belt 15 is arranged between two adjacent battery cells 121. Among them, along the width direction W of the shell 11, the thickness of the isolation belt 15 is equal to the spacing between the two battery cells 121, so that the isolation belt 15 is filled between the two adjacent battery cells 121 to prevent the high-temperature gas and liquid sprayed from the explosion-proof valve 1211 from flowing into the electrical compartment 112 from between the two adjacent battery cells 121. Along the height direction H of the shell 11, the height of the isolation belt 15 can be greater than or equal to the distance between the top surface and the bottom surface of the battery cell 121. That is, the isolation belt 15 can extend from the top surface of the battery cell 121 to the bottom surface, further ensuring that the high-temperature gas and liquid will not flow into between the two adjacent battery cells 121.

[0058] In one embodiment, in the height direction H of the housing 11, the isolation belt 15 extends out of 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 close to the pole 1212, the distance between the end of the isolation belt 15 away from the bottom surface and the top surface is greater than the height of the pole 1212. In other words, the height of the isolation belt 15 can be greater than the height of the pole 1212, further ensuring that high-temperature gas and liquid will not flow into between two adjacent battery cells 121.

[0059] In one embodiment, the difference between the distance between the end of the isolation belt 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 belt 15 from being too high and affecting the assembly of the battery module 12.

[0060] In actual application, in order to ensure that the pole 1212 is insulated from the shell 11, the battery module 12 further 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 strip 14 and the battery cell 121. In other words, the barrier strip 14 is located on the side of the insulating film 122 facing the inner wall of the shell 11. Figure 8 Another schematic diagram of a battery module provided in an embodiment of the present application. Figure 8As shown, in one embodiment, in each battery cell 121, an explosion-proof valve 1211 and two poles 1212 are sequentially arranged 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 arranged 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 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. Fig. 9 Another schematic diagram of a battery module provided in an embodiment of the present application. Fig. 9 As shown, in another embodiment, in each battery cell 121, an explosion-proof valve 1211 and two poles 1212 are sequentially arranged 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 arranged 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 in width along the length direction L are covered with the same insulating film 122. In addition, the portion of the insulating film 122 closest to the electrical compartment 112 can be located between the barrier strip 14 and the top surface.

[0061] In another embodiment, the explosion-proof valve 1211 may also be located at the bottom 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 under the action of the barrier tape 14.

[0062] In addition, in one embodiment, the battery pack 10 may further include a barrier plate. The barrier plate may be disposed on a side of the battery module 12 facing the electrical compartment 112. Along the width direction W of the housing 11, the length of the barrier plate is greater than or equal to the width of the battery module 12. In this way, the barrier plate may separate the battery module 12 from the electrical compartment 112 as a whole, further improving the safety of the battery pack 10.

[0063] Fig.10 A schematic diagram of a battery pack provided in an embodiment of the present application. Fig.10As shown, in one embodiment, the housing 11 is also provided with an explosion vent 113, which is opened when the gas 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 housing 11.

[0064] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A battery pack, characterized in that: It comprises a shell, the internal space of which 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, and the top surface is provided with two poles; each of the battery cells 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 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, and 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, characterized in that: 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, characterized in that: The barrier strip extends along the width direction of the housing; Along the width direction, the length of the barrier strip is greater than the width of the battery module.

4. The battery pack according to claim 3, characterized in that: 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, characterized in that: 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 in sequence 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 one-to-one correspondence; along the width direction, the spacing between two adjacent barrier strips among the at least two barrier strips is less than or equal to the spacing between two adjacent battery cells among the at least two battery cells.

6. The battery pack according to claim 1 or 2, characterized in that: The explosion-proof valve is located on the top surface, and the explosion-proof valve is located between the two poles; the two poles and the explosion-proof valve are arranged in sequence along the width direction or the length direction of the shell.

7. The battery pack according to claim 6, characterized in that: The plurality of battery cells include at least two battery cells close to the electrical compartment, the at least two battery cells are arranged in sequence along the width direction of the housing, and an isolation zone 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, characterized in that: 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 one 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, characterized in that: 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 claim 6, 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 strip and the battery cell.

11. The battery pack according to claim 1 or 2, characterized in that: The battery pack also includes a baffle plate, which is located on a side of the battery module facing the electrical compartment; along the width direction of the outer shell, the length of the baffle plate is greater than or equal to the width of the battery module.

12. The battery pack according to claim 1 or 2, characterized in that: 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 comprises a battery pack and a power converter as described in 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 it to the battery pack.

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