Battery pack

Abstract

The utility model provides a battery pack. The battery pack comprises a box body and a battery module, the box body comprises a lower box body and a box cover which are detachably connected, and the lower box body is provided with a containing cavity; the battery module is arranged in the accommodating cavity, the battery module comprises a plurality of single batteries, and each single battery is provided with a pressure release valve facing one side of the box cover; wherein a one-way valve which is in one-way conduction from the inside of the containing cavity to the outside of the containing cavity penetrates through the box body, and the one-way valve is communicated with the pressure release valve. In the embodiment of the invention, the pressure release valve of the battery monomer is communicated with the one-way valve arranged on the box body, and when the valve is opened due to thermal runaway of the battery monomer, the sprayed smoke and gas can be discharged from the one-way valve, so that the explosion caused by excessive pressure in the battery pack due to the fact that the smoke and gas are not discharged in time is improved; and the function failure of the whole battery pack is caused.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery pack. BACKGROUND

[0002] In the related art, the battery pack does not have a gas discharge channel. When the battery monomer in the battery pack appears thermal runaway, smoke and gas will be discharged. If the smoke and gas cannot be discharged in time, the pressure in the battery pack will be too large and the battery pack will explode, resulting in failure of the entire battery pack.

[0003] Therefore, it is urgent to solve the above technical problems. CONTENT OF THE UTILITY MODEL

[0004] The embodiments of the present application provide a battery pack, which can solve the technical problem that smoke and gas discharged after thermal runaway of a battery monomer in the battery pack cannot be discharged in time, the pressure in the battery pack is too large and the battery pack explodes, resulting in failure of the entire battery pack.

[0005] The embodiments of the present application provide a battery pack, which comprises:

[0006] A box body comprising a lower box body and a box cover connected detachably, the lower box body is provided with a containing cavity;

[0007] A battery module is arranged in the containing cavity, the battery module comprises a plurality of battery monomers, each battery monomer is provided with a pressure relief valve facing the side of the box cover;

[0008] The box body is provided with a one-way valve which is unidirectional from the containing cavity to the outside of the containing cavity, the one-way valve is in communication with the pressure relief valve.

[0009] In an embodiment, the battery pack comprises a hatch cover arranged between the box cover and the battery module, the hatch cover is provided with an opening corresponding to the pressure relief valve one by one, the one-way valve is arranged in the side wall of the lower box body and located on the side of the flange close to the box cover.

[0010] In an embodiment, the side wall of the lower box body is provided with a flange extending towards the center of the containing cavity, the side wall of the hatch cover is provided with a first folding edge extending towards the center away from the hatch cover, the first folding edge is detachably connected with the flange, and the battery module is arranged in the containing space formed by the hatch cover and the lower box body.

[0011] In an embodiment, the battery pack further comprises a sealing strip arranged between the hatch cover and the battery monomer, the sealing strip is provided with a through hole corresponding to the pressure relief valve one by one, and the sealing strip is in contact with the battery monomer and the hatch cover.

[0012] In an embodiment, the hatch cover is provided with a baffle with a notch at one end, the baffle is arranged around the plurality of openings to form air passages, and the notch is located at the center of the hatch cover and close to one side of the one-way valve.

[0013] In an embodiment, the battery module comprises at least two rows of battery cells, each row of battery cells is arranged along the length direction of the battery pack, the baffle comprises a first blocking part arranged on both sides of the pressure relief valve of the battery cells in the same row and a second blocking part connected to one end of the two first blocking parts, and the baffle is provided with the notch at one end opposite to the second blocking part.

[0014] In an embodiment, the end of the baffle provided with the notch is provided with a partition, the partition is arranged in connection with the side wall of the hatch cover, and the partition is in abutment with the first folding edge, and the one-way valve is arranged between two adjacent partitions.

[0015] In an embodiment, the baffle is in abutment with the box cover, and the partition is in abutment with the side wall of the lower box body.

[0016] In an embodiment, the box cover is plate-shaped, the shell opening edge of the lower box body is provided with a second folding edge extending towards the center of the accommodating cavity, and the box cover is detachably connected with the second folding edge.

[0017] In an embodiment, the bottom wall of the lower box body is provided with a partition, the battery module is located on one side of the partition close to the one-way valve, the partition is in abutment with the two opposite side walls of the lower box body, the first folding edge is detachably connected with the partition, the side of the partition away from the battery module is provided with a wire harness, and the side wall of the lower box body opposite to the one-way valve is provided with an interface, and the wire harness is connected with the interface.

[0018] Advantages of the embodiments of the present application:

[0019] In the embodiments of the present application, the pressure relief valve of the battery cell is communicated with the one-way valve arranged on the box body, when the battery cell appears thermal runaway and the valve is opened, the smoke and gas sprayed out can be discharged from the one-way valve, thereby improving the technical problem that the smoke and gas are not discharged in time, the pressure in the battery pack is too large, and the battery pack explodes, resulting in failure of the function of the whole battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating any creative labor.

[0021] Figure 1 is a perspective view of a battery pack provided by an embodiment of the present application;

[0022] Figure 2 is Figure 1 is a disassembled structural schematic view of the battery pack in

[0023] Figure 3 is Figure 1 is a partial structural schematic view of the battery pack in

[0024] Figure 4 is Figure 1 is another partial structural schematic view of the battery pack in

[0025] Figure 5 is Figure 1 is another partial structural schematic view of the battery pack in

[0026] Legend of reference signs:

[0027] battery pack 1;

[0028] box 10, lower box 11, flange 111, second folding edge 112, partition 113, box cover 12;

[0029] hatch 20, first folding edge 21, opening 20a, baffle 22, isolation part 221, first barrier part 222, second barrier part 223;

[0030] battery module 30, battery monomer 31, pressure relief valve 311;

[0031] one-way valve 40;

[0032] sealing strip 50, through hole 50a;

[0033] wire harness 60;

[0034] interface 70;

[0035] length direction D1 of the battery pack 1. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application. In addition, it should be understood that the specific implementation described herein is only used to illustrate and explain the present application, and is not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower directions of the device in the actual use or working state, and the specific direction is the direction of the drawing surface in the drawings; and "inner" and "outer" refer to the contour of the device.

[0037] The embodiments of the present application provide a battery pack 1. Figure 1 It is a perspective view of the battery pack 1. Figure 2 It is a perspective view of the battery pack 1. Figure 1 It is a disassembled structural schematic view of the battery pack in the battery pack 1. Figure 3 It is a perspective view of the battery pack 1. Figure 1 It is a partial structural schematic view of the battery pack 1 after removing the box cover 12, so as to facilitate the description of the structure inside the battery pack 1. Figure 4 It is a perspective view of the battery pack 1. Figure 3 It is a structural schematic view of the battery pack 1 further removing the hatch cover 20. Figure 5 It is a perspective view of the hatch cover 20.

[0038] As shown in Figures 1 to 5 , the battery pack 1 includes a box body 10 and a battery module 30, the box body 10 includes a lower box body 11 and a box cover 12 connected in a detachable manner, the lower box body 11 is provided with a containing cavity; the battery module 30 is arranged in the containing cavity, and the battery module 30 includes a plurality of battery monomers 31, each battery monomer 31 is provided with a pressure relief valve 311 facing the side of the box cover 12; wherein the box body 10 is provided with a one-way valve 40 which is unidirectional from the containing cavity to the outside of the containing cavity, and the one-way valve 40 is in communication with the pressure relief valve 311.

[0039] Optionally, as shown in Figure 1 and Figure 2 , the detachable connection manner of the lower box body 11 and the box cover 12 includes riveting, riveting and the like. For example, the lower box body 11 and the box cover 12 can be correspondingly provided with threaded holes, and bolts are arranged through the threaded holes to realize the connection of the lower box body 11 and the box cover 12.

[0040] As shown in Figure 1 and Figure 2 , the lower box body 11 is a shell, and the lower box body 11 can include a bottom wall and a plurality of side walls connected with the bottom wall, and the adjacent two side walls are connected to form the containing cavity. The side of the plurality of side walls away from the bottom wall forms a shell opening, and the box cover 12 is covered on the shell opening to form a closed containing cavity.

[0041] Optionally, the battery cell 31 can be a square battery or a cylindrical battery. The drawings of the present application take the square battery as an example for illustration, which should not be construed as a limitation of the present application.

[0042] Optionally, as shown in Figure 4 , a plurality of battery cells 31 are arranged in the accommodating cavity, and the pressure relief valve 311 of the battery cell 31 is arranged towards the box cover 12. When the battery cell 31 is in thermal runaway, the air pressure inside the battery cell 31 increases, and when the air pressure exceeds the opening threshold of the pressure relief valve 311, the pressure relief valve 311 opens, and the smoke and gas inside the battery cell 31 are sprayed out.

[0043] It should be noted that the box cover 12 and the pressure relief valve 311 are arranged at intervals to avoid the box cover 12 blocking the pressure relief valve 311 and affecting the spraying of smoke and gas.

[0044] As shown in Figure 2 and Figure 3 , the box body 10 is provided with a one-way valve 40, that is, the box body 10 is provided with a through hole, and the one-way valve 40 is arranged through the through hole. The inlet of the one-way valve 40 is arranged in the lower box body 11, and the outlet is arranged outside the lower box body 11.

[0045] As shown in Figure 4 , the one-way valve 40 communicates with the pressure relief valve 311, that is, the one-way valve 40 and the pressure relief valve 311 are not blocked. The smoke and gas sprayed from the pressure relief valve 311 can enter the one-way valve 40 and be discharged from the one-way valve 40.

[0046] Specifically, when the pressure inside the battery pack 1 increases and exceeds the opening threshold of the one-way valve 40, the one-way valve 40 opens, and the smoke and gas are discharged from the one-way valve 40 to the outside of the battery pack 1, thereby avoiding the explosion of the battery pack 1 due to excessive pressure inside the battery pack 1. The one-way valve 40 allows the smoke and gas to flow from the inside of the battery pack 1 to the outside of the battery pack 1, but cannot flow in the opposite direction. The one-way valve 40 can be a straight-through structure, but is not limited thereto.

[0047] As shown in Figure 2 and Figure 3 , in an embodiment, the side wall of the lower box body 11 is provided with a flange 111 extending towards the center of the accommodating cavity, the accommodating cavity is provided with a hatch cover 20, the side wall of the hatch cover 20 is provided with a first folding edge 21 extending away from the center of the hatch cover 20, the first folding edge 21 is detachably connected with the flange 111, and the battery module 30 is arranged in the accommodating space formed by the hatch cover 20 and the lower box body 11; wherein the hatch cover 20 is provided with an opening 20a corresponding to the pressure relief valve 311, and the one-way valve 40 is arranged through the side wall of the lower box body 11 and located on the side of the hatch cover 20 close to the box cover 12.

[0048] Optionally, as shown in Figure 4As shown, the side wall of the lower box body 11 is provided with a flange 111 extending towards the center of the accommodating cavity, the flange 111 is arranged in the middle region of the side wall of the lower box body 11, that is, the flange 111 is arranged spaced apart from the bottom wall of the lower box body 11 and the shell opening of the lower box body 11. The flange 111 can be arranged on the side walls of the opposite two sides of the lower box body 11, or the flange 111 can be arranged on the side walls of three sides of the lower box body 11, or the flange 111 can be arranged on the side walls of four sides of the lower box body 11. When the flange 111 is arranged on the side walls of more sides, the structural strength of the flange 111 is better, and the connection with the hatch cover 20 is more firm and reliable. The drawings of the present application take the flange 111 arranged on the side walls of three sides of the lower box body 11 as an example for description.

[0049] Optionally, as shown in Figure 3 and Figure 5 The hatch cover 20 is arranged in the accommodating cavity, and the upper surface of the hatch cover 20 does not exceed the shell opening of the lower box body 11. The hatch cover 20 is box-shaped, and includes a top wall and a side wall connected to the top wall, an end of the side wall away from the top wall forms a cover opening, the edge of the cover opening is bent away from the center of the hatch cover 20 to form a first folding edge 21, and the first folding edge 21 is detachably connected with the flange 111. For example, the first folding edge 21 and the flange 111 can be provided with corresponding threaded holes, and a bolt passes through the threaded holes to realize the connection of the hatch cover 20 and the flange 111.

[0050] Please refer to Figures 3 to 5 The hatch cover 20 and the bottom of the lower box body 11 form an accommodating space, and the battery module 30 is arranged in the accommodating space. The distance between the flange 111 and the bottom wall of the lower box body 11 is less than the distance between the pressure relief valve 311 and the bottom wall of the lower box body 11, and one end of the battery module 30 close to the box cover 12 is located inside the hatch cover 20.

[0051] As shown in Figure 3 The top wall of the hatch cover 20 is provided with an opening 20a corresponding to the pressure relief valve 311, and the smoke and gas sprayed from the pressure relief valve 311 can be sprayed from the opening 20a of the hatch cover 20, so as to avoid that the hatch cover 20 blocks the smoke and gas from being sprayed. The one-way valve 40 is arranged on the side wall of the lower box body 11 and located on the side of the hatch cover 20 close to the box cover 12, that is, the one-way valve 40 is located between the hatch cover 20 and the box cover 12.

[0052] The side of the battery monomer 31 close to the box cover 12 is also provided with an electrode, and the electrodes of two adjacent battery monomers 31 are connected with the busbar to realize the series and parallel connection of multiple battery monomers 31.

[0053] When the battery cell 31 is in thermal runaway, in addition to the smoke, gas, etc. being sprayed out, the electrolyte, pole piece, etc. inside the battery cell 31 can also be sprayed out. When these substances fall on the electrodes or bus bars, etc. of the battery cell 31, it can cause the battery cell 31 to short circuit and other abnormalities. Therefore, by providing the hatch cover 20, the sprayed electrolyte, pole piece, etc. can be isolated, and the battery cell 31 can be prevented from being abnormal due to these substances.

[0054] It should be understood that the top wall of the hatch cover 20 can be in contact with the upper surface of the battery module 30, thereby reducing the distance between the opening 20a of the hatch cover 20 and the pressure relief valve 311, and reducing the risk of electrolyte, pole piece, etc. splashing onto other battery cells 31 from the gap between the top wall of the hatch cover 20 and the upper surface of the battery module 30.

[0055] In an embodiment, referring to Figure 2 and Figure 4 , the battery pack 1 further comprises a sealing strip 50 arranged between the hatch cover 20 and the battery cell 31, the sealing strip 50 is provided with a through hole 50a corresponding to the pressure relief valve 311, and the sealing strip 50 is in contact with the battery cell 31 and the hatch cover 20.

[0056] Optionally, the sealing strip 50 is made of a flexible material and has a certain deformation ability. The sealing strip 50 can be made of rubber, but is not limited thereto.

[0057] The side of the sealing strip 50 close to the battery cell 31 is in contact with the battery cell 31, and the side of the sealing strip 50 close to the hatch cover 20 is in contact with the top wall of the hatch cover 20. The sealing strip 50 can achieve sealing between the hatch cover 20 and the battery cell 31, and prevent the sprayed electrolyte, smoke, gas, etc. from overflowing onto the adjacent battery cell 31.

[0058] In an embodiment, the side surface of the hatch cover 20 close to the box cover 12 is provided with a baffle 22 with a notch at one end, and the baffle 22 is arranged around the plurality of openings 20a to form an air channel, and the notch is located at the center of the hatch cover 20 close to the one-way valve 40.

[0059] Referring to Figure 2 , Figure 3 and Figure 5 , the top wall of the hatch cover 20 is extended and provided with a baffle 22 on the side close to the box cover 12, and the baffle 22 can be integrally arranged with the hatch cover 20. The baffle 22 can form an air channel with the box cover 12. One end of the baffle 22 has a notch, and the sprayed smoke, gas, etc. can flow along the air channel and overflow at the notch. Since the notch is close to the one-way valve 40, the smoke, gas, etc. can flow out of the one-way valve 40 more quickly. By providing the baffle 22, the smoke, gas, etc. can be prevented from spreading everywhere, and the influence of the smoke, gas, etc. on other structures in the battery pack 1 can be reduced.

[0060] Optionally, the front projection pattern of the baffle 22 on the top wall of the hatch cover 20 can be U-shaped. The baffle 22 can also be of other shapes, which are not limited in the present application.

[0061] In an embodiment, the battery module 30 includes at least two rows of battery monomers 31, and each row of battery monomers 31 is arranged along the length direction D1 of the battery pack 1. A gas channel is arranged corresponding to each row of battery monomers 31, and the extension direction of the gas channel is parallel to the length direction D1 of the battery pack 1.

[0062] The length direction D1 of the battery pack 1 refers to the extension direction of the side with the longest length in the bottom wall of the lower box body 11, that is, the direction shown by D1 in the figure. The width direction of the battery pack 1 can be a direction perpendicular to D1.

[0063] Each row of battery monomers 31 is arranged along the D1 direction, and adjacent two rows of battery monomers 31 are arranged along a direction perpendicular to the D1 direction. By arranging at least two rows of battery monomers 31, the present embodiment can provide higher output voltage or current.

[0064] The plurality of pressure relief valves 311 in each row are arranged corresponding to the same gas channel, which can simplify the structure of the baffle 22. Specifically, the baffle 22 can include a first blocking part 222 arranged on both sides of the pressure relief valve 311 of the same row of battery monomers 31, and a second blocking part 223 connecting the ends of the two first blocking parts 222. The end opposite to the second blocking part 223 is provided with a gap.

[0065] When the battery monomers 31 are two rows, the gas channels can also be two corresponding ones. When the battery monomers 31 are multiple rows, the gas channels can be multiple. The number of rows of battery monomers 31 can be the same as the number of gas channels.

[0066] In an embodiment, the end of the baffle 22 provided with the gap is provided with a partition part 221, the partition part 221 is arranged in connection with the side wall of the hatch cover 20, and the partition part 221 abuts against the first folding edge 21. The one-way valve 40 is arranged between the adjacent two partition parts 221.

[0067] As shown in FIGS. 1 and 2, the baffle 22 further includes a partition part 221 away from the end of the second blocking part 223, and the partition part 221 is arranged in connection with the first blocking part 222 and extends in the same direction. Figure 3 and Figure 5 As shown in FIGS. 1 and 2, the baffle 22 further includes a partition part 221 away from the end of the second blocking part 223, and the partition part 221 is arranged in connection with the first blocking part 222 and extends in the same direction.

[0068] It should be noted that the one-way valve 40 needs to be arranged in communication with the air passage. Therefore, the isolation portion 221 can be arranged on both sides of the one-way valve 40, and the isolation portion 221 is located on the side of the air passage away from the one-way valve 40. For example, two rows of battery monomers 31 correspondingly arrange two isolation portions 221, and both of the two isolation portions 221 are located at the end of the first blocking portion 222 of the air passage away from the one-way valve 40. Please refer to the accompanying drawings Figure 3 In the two first blocking portions 222 corresponding to the battery monomers 31 in the same row, the end of one of the first blocking portions 222 away from the one-way valve 40 is provided with the isolation portion 221, and the end of the other first blocking portion 222 close to the one-way valve 40 is not provided with the isolation portion 221, so as to avoid the isolation portion 221 blocking the air flow channel between the air passage and the one-way valve 40.

[0069] In an embodiment, the baffle plate 22 abuts against the box cover 12, and the isolation portion 221 abuts against the side wall of the lower box body 11.

[0070] In order to avoid the gap between the baffle plate 22 and the box cover 12 being too large to cause smoke and gas to overflow, the baffle plate 22 can abut against the box cover 12. Similarly, in order to avoid the gap between the isolation portion 221 and the side wall of the lower box body 11 being too large to cause smoke and gas to overflow, the isolation portion 221 can abut against the side wall of the lower box body 11. When smoke and gas overflow, the gas pressure in the air passage will decrease, causing the one-way valve 40 to be unable to open in time. If the one-way valve 40 does not open in time, it will increase the influence of the smoke and gas on other structures in the battery pack 1, and also increase the safety risk.

[0071] In an embodiment, as shown in Figure 1 and Figure 2 , the box cover 12 is plate-shaped, the shell opening edge of the lower box body 11 is provided with a second folding edge 112 extending towards the center of the accommodating cavity, and the box cover 12 is detachably connected with the second folding edge 112.

[0072] By arranging the box cover 12 to be plate-shaped, the structure of the box cover 12 can be simplified, and the processing difficulty of the box cover 12 is reduced. The shell opening edge of the lower box body 11 can be bent inwardly to form the second folding edge 112, and the box cover 12 can be detachably connected with the second folding edge 112. The detachable connection mode can refer to the above-mentioned embodiments, which will not be repeated here.

[0073] In an embodiment, as shown in Figure 2 and Figure 3 , the bottom wall of the lower box body 11 is provided with a partition plate 113, the battery module 30 is located on the side of the partition plate 113 close to the one-way valve 40, the partition plate 113 abuts against the opposite two side walls of the lower box body 11, the first folding edge 21 is detachably connected with the partition plate 113, the side of the partition plate 113 away from the battery module 30 is provided with a wire harness 60, and the side wall of the lower box body 11 opposite to the one-way valve 40 is provided with an interface 70, and the wire harness 60 is connected with the interface 70.

[0074] The accommodating cavity of the lower box body 11 is provided with a partition plate 113, which separates the battery module 30 from other structures in the battery pack 1, reducing the influence of smoke, gas, electrolyte, and pole pieces on other structures when the valve is opened. The partition plate 113 can extend in a direction perpendicular to the length direction D1 of the battery pack 1 and abut against the side walls of the opposite sides of the lower box body 11. The end of the partition plate 113 away from the bottom wall of the lower box body 11 can abut against the first folded edge 21 of the hatch cover 20, thereby forming an accommodation space for accommodating the battery module 30 together with the hatch cover 20. The end of the partition plate 113 abutting against the first folded edge 21 can be detachably connected with the first folded edge 21.

[0075] The side of the partition plate 113 away from the battery module 30 can be provided with a wire harness 60, which can be connected with the busbar and the battery cell 31 for collecting the voltage and temperature of the battery cell 31.

[0076] The side wall of the lower box body 11 opposite to the one-way valve 40 is provided with an interface 70 connected with the wire harness 60. The interface 70 can output the voltage and current of the battery pack 1 to an external device for providing power supply to the external device.

[0077] As shown in Figure 3 The interface 70 is provided on the side wall of the lower box body 11, that is, a through hole is provided on the side wall of the lower box body 11, one end of the interface 70 is connected with the wire harness 60 in the battery pack 1, and the other end extends to the outside of the battery pack 1 through the through hole. By arranging the wire harness 60 and the one-way valve 40 at the two ends of the length direction D1 of the battery pack 1, the distance between the wire harness 60 and the one-way valve 40 can be increased, and when the smoke and gas near the one-way valve 40 overflow, the influence on the wire harness 60 is smaller, reducing the safety risk.

[0078] In an embodiment, the hatch cover 20 is provided with an opening (not shown in the figure), and the wire harness 60 is provided in the opening and connected with the battery module 30.

[0079] Optionally, the opening is provided on the side wall of the side of the hatch cover 20 close to the interface 70, so that the distance between the opening and the interface 70 is smaller, and the length of the wire harness 60 is reduced.

[0080] Optionally, the outlet of the one-way valve 40 can be provided with a gas sensor, which can be used to detect the composition and concentration of the sprayed smoke and gas, facilitate the identification of the fault type of the battery cell 31, and timely handle the battery cell 31 with thermal runaway.

[0081] The above has carried out the detailed introduction to the embodiment of the application, the principle and implementation mode of the application have been described by applying specific examples in this paper, the above embodiment explanation is only for helping understanding the method of the application and its core idea; at the same time, for the person skilled in the art, according to the idea of the application, there will be changes in specific implementation mode and application range, and the above-mentioned, the content of the specification should not be understood as the limitation of the application.

Claims

1. A battery pack (1) characterized in that, The battery pack (1) comprises a hatch (20) arranged between the hatch cover (12) and the battery module (30), the hatch (20) is provided with an opening (20a) corresponding to each pressure relief valve (311), the one-way valve (40) is arranged in the side wall of the lower box (11) and located on the side of the hatch (20) close to the hatch cover (12). The side wall of the lower box (11) is provided with a flange (111) extending towards the center of the accommodating cavity, the side wall of the hatch (20) is provided with a first folding edge (21) extending away from the center of the hatch (20), the first folding edge (21) is detachably connected with the flange (111), and the battery module (30) is arranged in the accommodating space formed by the hatch (20) and the lower box (11). The battery pack (1) further comprises a sealing strip (50) arranged between the hatch (20) and the battery monomer (31), the sealing strip (50) is provided with a through hole (50a) corresponding to each pressure relief valve (311), and the sealing strip (50) is in contact with the battery monomer (31) and the hatch (20). The side surface of the hatch (20) close to the hatch cover (12) is provided with a baffle (22) with a notch at one end, the baffle (22) is arranged around the plurality of openings (20a) to form an air duct, and the notch is located on the side of the center of the hatch (20) close to the one-way valve (40).

2. The battery pack (1) according to claim 1, characterized in that The battery module (30) comprises at least two rows of battery monomers (31), and each row of battery monomers (31) is arranged along the length direction (D1) of the battery pack (1), the baffle (22) comprises a first blocking part (222) arranged on both sides of the pressure relief valve (311) of each battery monomer (31) in the same row and a second blocking part (223) connecting one end of the two first blocking parts (222), and the end of the baffle (22) opposite to the second blocking part (223) is provided with the notch.

3. The battery pack (1) according to claim 2, characterized in that The end of the baffle (22) provided with the notch is provided with an isolation part (221), the isolation part (221) is arranged in contact with the side wall of the hatch (20), and the isolation part (221) is in abutment with the first folding edge (21), and the one-way valve (40) is arranged between two adjacent isolation parts (221).

4. The battery pack (1) according to claim 3, characterized in that ​ 5. The battery pack (1) according to claim 4, characterized in that ​ 6. The battery pack (1) according to claim 5, characterized in that ​ 7. The battery pack (1) according to claim 6, characterized in that ​ 8. The battery pack (1) according to claim 7, characterized in that The baffle (22) is in abutment with the box cover (12), and the isolation part (221) is in abutment with the side wall of the lower box body (11).

9. The battery pack (1) according to claim 8, characterized in that The box cover (12) is plate-shaped, and the shell opening edge of the lower box body (11) is provided with a second folding edge (112) extending towards the center of the containing cavity, and the box cover (12) is detachably connected with the second folding edge (112).

10. The battery pack (1) according to any one of claims 3 to 9, characterized in that The bottom wall of the lower box body (11) is provided with a partition plate (113), the battery module (30) is located on one side of the partition plate (113) close to the one-way valve (40), the partition plate (113) is in abutment with the opposite two side walls of the lower box body (11), the first folding edge (21) is detachably connected with the partition plate (113), and one side of the partition plate (113) away from the battery module (30) is provided with a wire harness (60), and the side wall opposite to the one-way valve (40) in the lower box body (11) is provided with an interface (70), and the wire harness (60) is connected with the interface (70).

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