CN219873784U - Battery pack - Google Patents

Abstract

The present utility model provides a battery pack, comprising: a case; the battery module is arranged in the box body and comprises a plurality of single batteries; and the first heat insulation layers are arranged in one-to-one correspondence with the battery modules, the first heat insulation layers are attached to the tops of the battery modules corresponding to the first heat insulation layers, a plurality of first pressure relief openings are formed in the first heat insulation layers in a penetrating mode, and the first pressure relief openings and the battery modules corresponding to the first heat insulation layers are arranged in one-to-one correspondence with the single batteries. The first heat insulation layer can play a certain heat insulation protection role on other single batteries adjacent to the single battery with thermal runaway above the battery module, so that the possibility that the thermal runaway of the other single batteries is caused by the occurrence of the thermal runaway of the single battery at a position close to the top of the battery module when the thermal runaway of the single battery occurs is reduced, and the safety of the battery pack is further improved.

Description

Battery pack

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery pack.

Background

The existing battery pack structure mainly comprises a box body, a supporting piece is arranged at the bottom of the box body and used for assembling a battery module, a pressure release cavity is formed by a gap between the bottom of the supporting piece and the bottom of the box body, and an explosion-proof valve of a single battery of the battery module is communicated with the pressure release cavity. When a certain single battery of the battery module is out of control, explosion venting substances (high-temperature high-pressure gas) of the single battery are sprayed into the pressure relief cavity through the explosion-proof valve, and after primary pressure release and heat dissipation of the explosion venting substances in the pressure relief cavity are completed, the explosion venting substances are discharged out of the box through the pressure relief flow channel. But when the battery cell is in thermal runaway, part of explosion venting substances can move towards the direction deviating from the pressure release cavity, in some cases, the explosion venting substances can be sprayed out from other positions except for an explosion-proof valve when the battery cell is in thermal runaway, such as weak parts of the side wall of the shell of the battery cell, and the explosion venting substances in the cases all have risks of moving and diffusing along the direction deviating from the pressure release cavity, so that the battery cell of the battery module is caused to have a thermal spreading phenomenon at the position close to the top of the battery module, and further the risk of triggering other battery cells to have thermal runaway is caused, and the safety is low.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model aims to provide a battery pack, when the single battery is in thermal runaway, the risk that the top of a battery module in the battery pack is in thermal runaway to cause the thermal runaway of other single batteries is low, and the safety of the battery pack is high.

The embodiment of the utility model is realized by the following technical scheme:

a battery pack, comprising: a case; the battery module is arranged in the box body and comprises a plurality of single batteries; and the first heat insulation layers are arranged in one-to-one correspondence with the battery modules, the first heat insulation layers are attached to the tops of the battery modules corresponding to the first heat insulation layers, a plurality of first pressure relief openings are formed in the first heat insulation layers in a penetrating mode, and the first pressure relief openings and the battery modules corresponding to the first heat insulation layers are arranged in one-to-one correspondence with the single batteries.

According to a preferred embodiment, the battery module further comprises a CCS assembly disposed on the upper side of the unit cell, and the first heat insulation layer is attached to the upper side of the CCS assembly.

According to a preferred embodiment, the battery pack further comprises a second heat insulation layer which is attached to the bottom of the battery module, and a pressure release cavity is formed between the second heat insulation layer and the bottom of the box body; the explosion-proof valve of the single battery is arranged towards the second heat insulation layer; when the single battery is out of control, the explosion venting substance released by the explosion-proof valve of the single battery can break through the area corresponding to the explosion-proof valve on the second heat insulation layer, so that the explosion venting substance enters the pressure relief cavity.

According to a preferred embodiment, the box body comprises a lower shell, and a guide beam is arranged on the inner side wall of the lower shell in a surrounding manner; at least one bearing beam is arranged in the lower shell, the at least one bearing beam is positioned in an area surrounded by the guide beams, the area is divided into at least two mounting grooves corresponding to at least two battery modules one by one, and the battery modules are arranged in the corresponding mounting grooves; the pressure release cavity is positioned in the mounting groove; the guide beam is internally provided with a pressure relief channel along the extending direction of the guide beam, the guide beam is provided with a second pressure relief opening, and the lower shell is provided with a third pressure relief opening, wherein: the pressure release cavity is communicated with the pressure release channel through the second pressure release opening, and the pressure release channel is communicated with the external environment through the third pressure release opening.

According to a preferred embodiment, the battery module further comprises a module tray, the single battery is arranged in the module tray, and the single battery is abutted to the inner side surface of the bottom of the module tray; the bottom of the module tray is provided with a plurality of fourth pressure relief openings in a penetrating manner, wherein the fourth pressure relief openings correspond to the single batteries one by one; the explosion-proof valve of the single battery faces or is embedded into the fourth pressure relief opening corresponding to the single battery; the second heat insulation layer is arranged on the outer side surface of the module tray in a bonding mode and is used for blocking the fourth pressure relief opening; the module tray is lapped on the mounting groove corresponding to the battery module; the pressure release cavity is positioned between the second heat insulation layer and the groove wall of the mounting groove.

According to a preferred embodiment, the second insulating layer is mica paper.

According to a preferred embodiment, the lower shell comprises an annular frame and a bottom guard plate arranged at the bottom of the annular frame; the guide beam is arranged on the annular frame, and the bearing beam is connected to the guide beam.

According to a preferred embodiment, the upper side of the guide beam is flush with the upper side of the carrier beam; the module tray is abutted to the upper side face of the guide beam and the upper side face of the bearing beam.

According to a preferred embodiment, the case further comprises an upper cover, the upper cover being provided at the open end of the lower case; a sealing strip is arranged between the upper cover and the lower shell.

According to a preferred embodiment, a relief valve is provided at the third relief port.

According to a preferred embodiment, the first insulating layer is mica flakes or mica paper.

The technical scheme of the embodiment of the utility model has at least the following advantages and beneficial effects:

the first heat insulation layer can play a role in protecting heat insulation of other single batteries adjacent to the single battery with thermal runaway at the upper part of the battery module, particularly, when explosion venting substances discharged through the first pressure relief opening diffuse at the upper part of the battery module, the probability that the explosion venting substances are in contact with the other single batteries or transfer heat to the other single batteries is greatly reduced due to the existence of the first heat insulation layer, so that the possibility that the thermal runaway of the other single batteries is caused by the occurrence of thermal runaway at a position close to the top of the battery module when the thermal runaway of the single batteries occurs is reduced, and the safety of the battery pack is further improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is an exploded view of a battery pack according to an embodiment of the present utility model;

fig. 2 is a schematic perspective view of a battery module according to an embodiment of the present utility model;

fig. 3 is a schematic diagram of an assembly structure of a module tray and a second heat insulation layer according to an embodiment of the present utility model;

fig. 4 is a schematic diagram of an explosion structure of a battery module after a module tray is removed according to an embodiment of the present utility model;

fig. 5 is a schematic perspective view of a lower shell according to an embodiment of the present utility model;

fig. 6 is a schematic diagram of an assembly structure of a battery module, a load beam and a guide beam according to an embodiment of the present utility model.

Icon: 100. a case; 110. a bottom guard board; 120. an annular frame; 1201. a third pressure relief vent; 1202. a first separator; 121. a pressure release valve; 122. a guide beam; 1221. a second pressure relief vent; 1222. a pressure relief channel; 1223. a second separator; 123. a load beam; 124. a mounting groove; 130. an upper cover; 200. a sealing strip; 300. a battery module; 310. a second insulating layer; 320. a module tray; 321. a substrate; 322. flanging; 323. a fixing hole; 324. a fourth pressure relief vent; 330. a single battery; 340. a CCS component; 350. a first insulating layer; 351. a first pressure relief vent; 400. a pressure relief cavity.

Detailed Description

For a better understanding and implementation, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model.

In the description of the present utility model, it should be noted that, if the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are referred to, the positional relationship is based on the positional relationship shown in the drawings, it is merely for convenience of describing the present utility model and simplifying the description, and it does not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance unless explicitly specified or limited otherwise; the term "plurality" refers to two or more than two; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, references to "the/the" object or "an" object are likewise intended to mean one of a possible plurality of such objects.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model; the terms "comprising" and "having" and any variations thereof in the description of the utility model and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion.

Further, in the description of the present utility model, it should be understood that the terms "upper", "lower", "inner", "outer", and the like are described with reference to the angle shown in the drawings, and should not be construed as limiting the specific embodiments. It will also be understood that in the context of an element or feature being connected to another element(s) "upper," "lower," or "inner," "outer," it can be directly connected to the other element(s) "upper," "lower," or "inner," "outer," or indirectly connected to the other element(s) "upper," "lower," or "inner," "outer" via intervening elements.

Referring to fig. 1 to 6, a battery pack includes a case 100, a battery module 300 and a first insulating layer 350, wherein at least one battery module 300 is disposed in the case 100, and the battery module 300 includes a plurality of unit batteries 330; the first heat insulation layers 350 are arranged in one-to-one correspondence with the battery modules 300, the first heat insulation layers 350 are attached to the tops of the battery modules 300 corresponding to the first heat insulation layers 350, a plurality of first pressure relief openings 351 are formed in the first heat insulation layers 350 in a penetrating mode, and the first pressure relief openings 351 and the single batteries 330 of the battery modules 300 corresponding to the first heat insulation layers 350 are arranged in one-to-one correspondence with each other. In this embodiment, the battery pack includes four battery modules 300, where the battery modules 300 are cylindrical power battery modules 300. Specifically, as shown in fig. 2 and 6, when one of the unit cells 330 is thermally out-of-control, and the explosion venting material released from the unit cell 330 moves toward the top of the battery module 300 along the height direction of the unit cell 330, the explosion venting material moving toward the top of the battery module 300 is discharged out of the battery module 300 through the first pressure release opening 351 corresponding to the unit cell 330, and the first heat insulation layer 350 can play a role in protecting the heat insulation of other unit cells 330 adjacent to the unit cell 330 that is thermally out-of-control above the battery module 300 to a certain extent. Specifically, when the explosion venting material discharged through the first pressure relief opening 351 diffuses above the battery module 300, the first heat insulation layer 350 greatly reduces the probability that the explosion venting material contacts with other unit batteries 330 or transfers heat to other unit batteries 330, thereby reducing the probability that when the unit batteries 330 are out of control, the heat spreading occurs at a position close to the top of the battery module 300 to cause the other unit batteries 330 to be out of control, and further improving the safety of the battery pack.

Further, the battery module 300 further includes a CCS assembly 340 disposed on the upper side of the unit cell 330, and the first heat insulation layer 350 is attached to the upper side of the CCS assembly 340. Specifically, CCS assembly 340 includes a plastic rack and a bus bar disposed on the plastic rack. The plastic bracket is provided with a rivet stem (not shown) by which the first insulating layer 350 is rivet-fixed to the upper side of the CCS assembly 340. Likewise, the first insulating layer 350 can isolate the explosion venting material discharged through the first pressure relief opening 351 from the CCS assembly 340 to a great extent, thereby protecting the CCS assembly 340 when the unit cell 330 is thermally out of control, and improving the safety of the battery pack.

In this embodiment, the first insulating layer 350 is optionally mica sheet or mica paper. Preferably, the first insulating layer 350 is a mica sheet.

As shown in fig. 2, 3 and 6, the battery pack further includes a second heat insulation layer 310 attached to the bottom of the battery module 300, and a pressure release chamber 400 is formed between the second heat insulation layer 310 and the bottom of the case 100; an explosion-proof valve (not shown) of the unit cell 330 is disposed toward the second insulation layer 310; when the unit cell 330 is out of control, the explosion venting material released by the explosion-proof valve of the unit cell 330 can break through the area of the second thermal insulation layer 310 corresponding to the explosion-proof valve, so that the explosion venting material enters the pressure release cavity 400. The second insulating layer 310 herein constitutes the pressure release chamber 400 and serves to thermally insulate the bottom of the battery module 300 when the unit cells 330 are thermally out of control. Specifically, when one of the unit cells 330 in the battery module 300 is thermally out of control, the explosion venting material is discharged from the explosion-proof valve, and the explosion venting material is sufficient to break through a part of the area of the second insulating layer 310 corresponding to the explosion-proof valve, and most of the explosion venting material enters the pressure release cavity 400 through the second insulating layer 310, and is discharged out of the case 100 after the pressure is initially released and the temperature is reduced in the pressure release cavity 400. The second heat insulation layer 310 makes the heat of the explosion venting material in the pressure release cavity 400 difficult to transfer to other single batteries 330, that is, avoids the influence of the explosion venting material in the pressure release cavity 400 on the single batteries 330 around the single batteries 330 with thermal runaway, and further avoids the possibility that the bottom of the battery module 300 is thermally spread to cause the thermal runaway of other single batteries 330, thereby improving the safety of the battery pack. While a small portion of the explosion venting material escapes upward and is discharged through the first pressure relief vent 351 to above the first insulating layer 350. Through the first insulating layer 350 and the second insulating layer 310 matched structural design for when one of the unit cells 330 of the battery module 300 is out of control, the possibility that the heat spreading occurs at the top and the bottom of the battery module 300 and then other unit cells 330 are triggered to occur out of control is effectively reduced, and the safety of the battery pack is ensured.

Preferably, the second insulating layer 310 is mica paper. In other embodiments, the second insulating layer 310 may be made of other insulating materials, such as aerogel materials, ceramic fiber materials, etc., where the thickness of the second insulating layer 310 is not specifically limited, so long as it can perform a heat insulation function, and the explosion venting material can downwards burst through the corresponding area into the pressure release chamber 400, and the explosion venting material entering the pressure release chamber 400 cannot upwards burst through the second insulating layer 310.

In some embodiments, the inner walls of the pressure relief chamber 400 are optionally coated with a polymeric heat absorbing coating (not shown). When the explosion venting material enters the pressure release cavity 400, the polymer heat absorbing coating absorbs heat to melt or evaporate to take away the heat of the explosion venting material, so that the possibility of heat spreading of the explosion venting material at the bottom of the battery module 300 can be further reduced.

As shown in fig. 1 and 5, the box 100 includes a lower case, and a guide beam 122 is disposed on an inner sidewall of the lower case in a surrounding manner; at least one bearing beam 123 is arranged in the lower shell, the at least one bearing beam 123 is positioned in an area surrounded by the guide beams 122, the area is divided into at least two mounting grooves 124 corresponding to at least two battery modules 300 one by one, and the battery modules 300 are arranged in the corresponding mounting grooves 124; the pressure relief cavity 400 is within the mounting slot 124; the guide beam 122 is provided with a pressure release channel 1222 along the extending direction thereof, the guide beam 122 is provided with a second pressure release opening 1221, and the lower shell is provided with a third pressure release opening 1201, wherein: pressure relief chamber 400 communicates with pressure relief channel 1222 through second pressure relief port 1221, and pressure relief channel 1222 communicates with the external environment through third pressure relief port 1201. In use, explosion venting material within pressure relief chamber 400 enters pressure relief passage 1222 through second pressure relief port 1221 and then exits the battery package through third pressure relief port 1201 through pressure relief passage 1222.

In this embodiment, the relief valve 121 is disposed at the third relief port 1201. When the air pressure in the pressure relief channel 1222 reaches a certain value range, the pressure relief valve 121 is opened to relieve pressure, so that the risk of explosion caused by high temperature and high pressure in the battery pack is reduced.

Further, the lower case includes an annular frame 120 and a bottom guard plate 110 disposed at the bottom of the annular frame 120; the guide beam 122 is disposed on the annular frame 120, and the carrier beam 123 is connected to the guide beam 122. As shown in fig. 5, the annular frame 120 is a rectangular frame, and the diversion beams 122 are annularly arranged along the extending direction of the annular frame 120 on the inner wall of the annular frame 120. The four load beams 123 are disposed at intervals along the length direction of the ring frame 120. The bottom guard plate 110 is mounted to the bottom of the annular frame 120 by bolts or screws. In this embodiment, the guide beam 122 and the annular frame 120 are hollow aluminum profiles. The deflector beam 122 is integrally formed with the annular frame 120. The hollow cavity of the beam 122 constitutes a pressure relief channel 1222.

As shown in fig. 6, a plurality of first partitions 1202 are disposed in the hollow cavity of the annular frame 120 to increase the structural strength of the annular frame 120. A second separator 1223 is disposed in the hollow cavity of the guide beam 122 to increase the structural strength of the guide beam 122.

As shown in fig. 2, 3 and 6, in the present embodiment, the battery module 300 further includes a module tray 320, the unit cells 330 are disposed in the module tray 320, and the unit cells 330 are abutted to the inner side surface of the bottom of the module tray 320; the bottom of the module tray 320 is provided with a plurality of fourth pressure relief openings 324 in a penetrating manner, wherein the fourth pressure relief openings correspond to the plurality of single batteries 330 one by one; the explosion-proof valve of the unit cell 330 faces or is embedded into the fourth pressure relief port 324 corresponding to the unit cell 330; the second heat insulating layer 310 is attached to the outer side surface of the module tray 320, and is used for plugging the fourth pressure relief opening 324; the module tray 320 is overlapped on the mounting groove 124 corresponding to the battery module 300; the pressure relief cavity 400 is between the second insulation 310 and the wall of the mounting groove 124. In this embodiment, the second insulating layer 310 is adhered to the outer side of the module tray 320. The module tray 320 is used for carrying the unit cells 330 constituting the battery module 300, so as to facilitate rapid assembly of the battery module 300 and the case 100. The fourth pressure release opening 324 can guide the explosion venting material of the thermal runaway unit battery 330 sprayed from the explosion-proof valve thereof, so as to accurately burst the second heat insulation layer 310 blocking the fourth pressure release opening 324, reduce the possibility of breakage of the second heat insulation layer 310 in other areas caused by the explosion venting material spraying path, and have high safety.

In this embodiment, the explosion-proof valve of the unit cell 330 is preferably disposed opposite to the fourth pressure release port 324.

As shown in fig. 3, in the present embodiment, the module tray 320 includes a base 321, and a flange 322 is disposed on a side edge of the base 321; the fourth pressure relief port 324 is disposed through the substrate 321. The flange 322 here facilitates the assembly of the battery module 300. Specifically, the flange 322 is provided to protrude upward in a direction away from the base plate 321. So set up for module tray 320 main part is the recess form, and battery cell 330 assembles in recess form structure, and the battery module 300 of being convenient for is transported when making things convenient for battery cell 330 assembly, has reduced the risk that battery cell 330 breaks away from module tray 320 before unfixed.

In this embodiment, the upper side of the guide beam 122 is flush with the upper side of the carrier beam 123; the module tray 320 abuts the upper side of the guide beam 122 and the upper side of the load beam 123. Specifically, the lower side of the flange 322 overlaps the upper side of the guide beam 122 and the upper side of the load beam 123. The upper side of the guide beam 122 is flush with the upper side of the bearing beam 123, so that the tightness of the pressure release cavity 400 is higher after the battery module 300 is installed in the installation groove 124, explosion venting substances in the pressure release cavity 400 can be prevented from having other escape channels except the second pressure release opening 1221, and the safety of the battery pack is improved.

In this embodiment, the base 321 is integrally formed with the flange 322. The module tray 320 is a stamping. Optionally, the flange 322 is provided with a fixing hole 323. The module tray 320 is fixed to the load beam 123 by bolts or screws. Bolts or screws are inserted into the fixing holes 323.

In this embodiment, the case 100 further includes an upper cover 130, where the upper cover 130 is covered at the opening end of the lower case; a sealing strip 200 is disposed between the upper cover 130 and the lower case.

The technical means disclosed by the scheme of the utility model is not limited to the technical means disclosed by the embodiment, and also comprises the technical scheme formed by any combination of the technical features. It should be noted that modifications and adaptations to the utility model may occur to one skilled in the art without departing from the principles of the present utility model and are intended to be within the scope of the present utility model.

Claims (11)

1. A battery pack, comprising:

a case (100);

the battery module (300) is arranged in the box body (100), and the battery module (300) comprises a plurality of single batteries (330); and

the first heat insulation layers (350) are arranged in one-to-one correspondence with the battery modules (300), the first heat insulation layers (350) are attached to the tops of the battery modules (300) corresponding to the first heat insulation layers, a plurality of first pressure relief openings (351) are formed in the first heat insulation layers (350) in a penetrating mode, and the first pressure relief openings (351) and the single batteries (330) of the battery modules (300) corresponding to the first heat insulation layers (350) are arranged in one-to-one correspondence.

2. The battery pack according to claim 1, wherein the battery module (300) further comprises a CCS assembly (340) disposed on an upper side of the unit cell (330), and the first heat insulating layer (350) is attached to an upper side surface of the CCS assembly (340).

3. The battery pack according to claim 1, further comprising a second heat insulating layer (310) attached to the bottom of the battery module (300), wherein a pressure release cavity (400) is formed between the second heat insulating layer (310) and the bottom of the case (100);

the explosion-proof valve of the single battery (330) is arranged towards the second heat insulation layer (310);

when the single battery (330) is out of control, the explosion venting material released by the explosion-proof valve of the single battery (330) can break through the area corresponding to the explosion-proof valve on the second heat insulation layer (310) so that the explosion venting material enters the pressure release cavity (400).

4. A battery pack according to claim 3, wherein the case (100) comprises a lower case, and a guide beam (122) is provided on an inner side wall of the lower case in a surrounding manner;

at least one bearing beam (123) is arranged in the lower shell, at least one bearing beam (123) is positioned in an area surrounded by the guide beams (122), the area is divided into at least two mounting grooves (124) corresponding to at least two battery modules (300) one by one, and the battery modules (300) are arranged in the corresponding mounting grooves (124);

the pressure relief cavity (400) is located within the mounting groove (124);

the utility model discloses a flow guiding beam, be provided with pressure release passageway (1222) along its extending direction in flow guiding beam (122), be provided with second pressure release mouth (1221) on flow guiding beam (122), be provided with third pressure release mouth (1201) on the inferior valve, wherein:

the pressure release cavity (400) is communicated with the pressure release channel (1222) through the second pressure release opening (1221), and the pressure release channel (1222) is communicated with the external environment through the third pressure release opening (1201).

5. The battery pack according to claim 4, wherein the battery module (300) further comprises a module tray (320), the unit cells (330) are disposed in the module tray (320), and the unit cells (330) are abutted to the bottom inner side surface of the module tray (320);

the bottom of the module tray (320) is provided with a plurality of fourth pressure relief openings (324) in a penetrating manner, wherein the fourth pressure relief openings are in one-to-one correspondence with the plurality of single batteries (330);

the explosion-proof valve of the single battery (330) faces or is embedded into the fourth pressure relief opening (324) corresponding to the single battery (330);

the second heat insulation layer (310) is attached to the outer side surface of the module tray (320) and is used for blocking the fourth pressure relief opening (324);

the module tray (320) is overlapped on the mounting groove (124) corresponding to the battery module (300);

the pressure relief cavity (400) is located between the second insulating layer (310) and a groove wall of the mounting groove (124).

6. The battery pack according to any one of claims 3-5, wherein the second insulating layer (310) is mica paper.

7. The battery pack according to claim 4, wherein the lower case includes an annular frame (120) and a bottom guard plate (110) provided at the bottom of the annular frame (120);

the guide beam (122) is arranged on the annular frame (120), and the bearing beam (123) is connected to the guide beam (122).

8. The battery pack according to claim 5, wherein an upper side of the guide beam (122) is flush with an upper side of the carrier beam (123);

the module tray (320) is abutted to the upper side of the guide beam (122) and the upper side of the carrier beam (123).

9. The battery pack according to claim 4, wherein the case (100) further includes an upper cover (130), the upper cover (130) being provided to cover the open end of the lower case;

a sealing strip (200) is arranged between the upper cover (130) and the lower shell.

10. The battery pack according to claim 4, wherein a pressure relief valve (121) is provided at the third pressure relief port (1201).

11. The battery pack according to any one of claims 1-5, 7-10, wherein the first insulating layer (350) is a mica sheet or a mica paper.