Single battery, battery pack and power utilization device

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a single battery, a battery pack and an electric device. Each single battery comprises a shell, a pole core, an insulating film and a first anti-explosion valve, the pole core is accommodated in the shell, and the first anti-explosion valve is mounted on the shell; the insulating film comprises a side film and end films, the side film wraps the peripheral surface of the shell in the circumferential direction, the end films are attached to the two end faces of the shell, lap joints are formed at the joints of the end films and the side film, and the position of the first anti-explosion valve on the shell corresponds to the position of the lap joints. The first explosion-proof valve is covered by the insulating film, so that the protection against liquid leakage can be improved. The first anti-explosion valve is arranged corresponding to the lap joint seam, a short exhaust path of the first anti-explosion valve can be achieved, gas is exhausted through the first anti-explosion valve, the weak area is impacted in the first time, the lap joint seam is torn for exhaust, and pressure relief can be conducted in time.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and in particular relates to a single battery, a battery pack and an electric device. Background Art

[0002] In order to improve the safety of power batteries, explosion-proof valves are usually installed on the batteries. When the internal pressure of the battery increases, the explosion-proof valve is opened to release the pressure, thereby avoiding accidents such as explosions.

[0003] However, foreign matter can easily enter the explosion-proof valve, which may affect the valve's ability to open when thermal runaway occurs, and the battery cannot be depressurized in time. Utility Model Content

[0004] The technical problem to be solved by the utility model is: to provide a single cell, a battery pack and an electric device in view of the problem that the existing explosion-proof valve cannot release the pressure of the battery in time.

[0005] In order to solve the above technical problems, on the one hand, the embodiment of the utility model provides a single battery, comprising a shell, a pole core, an insulating film and a first explosion-proof valve, wherein the pole core is accommodated in the shell, and the first explosion-proof valve is installed on the shell;

[0006] The insulating film includes a side film and an end film, the shell has an outer peripheral surface and two end surfaces, the outer peripheral surface extends axially between the two end surfaces, the side film wraps the outer peripheral surface along the circumferential direction, the end film is attached to the two end surfaces, and a lap joint is formed at the junction of the end film and the side film, and the position of the first explosion-proof valve on the shell corresponds to the position of the lap joint.

[0007] Optionally, the overlap seam is located within a projection of the first explosion-proof valve on the insulating film.

[0008] Optionally, a projection of the overlap seam on the first explosion-proof valve is located in the middle of the first explosion-proof valve.

[0009] Optionally, the side membrane and the end membrane partially overlap at the junction to form an overlapping area, the overlapping seam is located at the edge of the overlapping area, and the overlapping area covers a portion of the first explosion-proof valve.

[0010] Optionally, the end film covers a portion of the side film to form the overlapping area, and the overlapping area is located on the outer peripheral surface.

[0011] Optionally, the side film covers a portion of the end film to form the overlapping area, and the overlapping area is located on the end surface.

[0012] Optionally, the length of the overlapping area is 8 to 12 mm.

[0013] Optionally, the end membrane comprises a first end membrane and a second end membrane, the housing has a first end surface and a second end surface arranged opposite to each other, the first end membrane is attached to the first end surface, and the second end membrane is attached to the second end surface;

[0014] The overlapping area includes a first overlapping area and a second overlapping area. The first end film extends toward the side film and covers a portion of the side film to form the first overlapping area. The second end film extends toward the side film and covers a portion of the side film to form the second overlapping area.

[0015] Optionally, the first overlapping area covers the first explosion-proof valve, and a position of the first explosion-proof valve on the housing is arranged corresponding to a position of the first overlapping area.

[0016] Optionally, the side membrane includes a first membrane sheet, a second membrane sheet, a third membrane sheet and a fourth membrane sheet connected in sequence, the peripheral surface includes a first side surface, a second side surface, a third side surface and a fourth side surface, the first side surface and the third side surface are arranged opposite to each other, and the second side surface and the fourth side surface are arranged opposite to each other;

[0017] The first diaphragm is attached to the first side surface, the second diaphragm is attached to the second side surface, the third diaphragm is attached to the third side surface, and the fourth diaphragm is attached to the fourth side surface.

[0018] Optionally, the first explosion-proof valve is arranged at the bottom of the shell, or the surface area of ​​the first side surface is smaller than the surface area of ​​the second side surface, and the first explosion-proof valve is arranged on the first side surface.

[0019] On the other hand, an embodiment of the present invention provides a battery pack, including a battery group, wherein the battery group includes a plurality of single cells as described above.

[0020] Optionally, it further comprises a tray, a cover plate and a second explosion-proof valve, wherein the cover plate is connected to the tray to define an accommodating space for accommodating the battery pack, and the second explosion-proof valve is arranged on the tray and / or the cover plate;

[0021] A first exhaust channel, an inlet and an outlet are provided on the tray and / or the cover plate, the first exhaust channel connects the inlet and the outlet, the second explosion-proof valve is provided at the outlet, and when the first explosion-proof valve is opened, the high-pressure gas in the single battery can enter the first exhaust channel through the first explosion-proof valve and the inlet and be discharged through the second explosion-proof valve.

[0022] Optionally, the position of the first explosion-proof valve is arranged corresponding to the position of the inlet.

[0023] Optionally, the tray includes an exhaust channel plate and a frame arranged around the outer edge of the exhaust channel plate, the bottom surface of the battery pack is connected to the exhaust channel plate, the first exhaust channel and the inlet are arranged on the exhaust channel plate, and the first explosion-proof valve is arranged on a side of the single battery close to the exhaust channel plate.

[0024] Optionally, the exhaust channel plate includes a flow channel plate and an inner plate, the inlet is arranged on the inner plate, and the flow channel plate is arranged on a side of the inner plate away from the battery pack;

[0025] The flow channel plate is provided with a first flow channel groove which is recessed in a direction away from the inner plate, and the flow channel plate is attached to the inner plate to define the first exhaust channel;

[0026] And / or, the tray further includes a bottom plate, the exhaust channel plate is arranged on the bottom plate, a second flow channel groove is formed between two adjacent first flow channel grooves, and the bottom plate can cover the second flow channel groove to define a second exhaust channel.

[0027] Optionally, the tray further includes an exhaust guide block, the outlet is arranged on the exhaust guide block, a guide channel is arranged on the exhaust guide block, and the guide channel connects the exhaust channel and the outlet.

[0028] Optionally, the exhaust guide block is arranged on the exhaust channel plate, or the exhaust guide block is arranged on the frame.

[0029] Optionally, the battery pack further includes at least one insulating member, wherein the insulating member is disposed between the battery group and the tray, and a through hole is disposed on the insulating member, and a position of the first explosion-proof valve corresponds to a position of the through hole.

[0030] Optionally, the battery pack further includes a first structural adhesive, which is disposed between the cover plate and the battery pack; and / or the battery pack further includes a second structural adhesive, which is disposed between the battery pack and the tray.

[0031] On the other hand, an embodiment of the present invention provides an electrical device, including the battery pack as described above.

[0032] The single cell provided by the embodiment of the utility model can cover the first explosion-proof valve by wrapping the shell with the side film and the end film, and has a good protective effect, which can prevent foreign matter from entering the explosion-proof valve and affecting its opening ability. During the normal operation of the single cell, the first explosion-proof valve is wrapped by the insulating film to avoid contact short circuit, and at the same time, it can improve the protection against liquid leakage and avoid the high-voltage safety risk caused by liquid leakage.

[0033] On the other hand, by arranging the first explosion-proof valve at the lap joint, a shorter exhaust path of the first explosion-proof valve can be achieved. The lap joint is located at the junction of the edge of the side membrane and the edge of the end membrane, which is a weak area. When the inside of the single cell is out of control, the first explosion-proof valve opens normally, and the gas generated inside the single cell is discharged through the first explosion-proof valve. The gas will immediately impact the weak lap joint, thereby tearing the lap joint to achieve exhaust, and can release pressure in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of a first explosion-proof valve on a single battery provided by an embodiment of the utility model;

[0035] Figure 2 It is a schematic diagram of an insulating film provided by an embodiment of the utility model;

[0036] Figure 3 It is an exploded schematic diagram of a battery pack provided by an embodiment of the utility model;

[0037] Figure 4 It is a schematic diagram of a tray provided in one embodiment of the utility model;

[0038] Figure 5 is a schematic diagram of an exhaust channel plate provided by an embodiment of the utility model;

[0039] Figure 6 It is a bottom view schematic diagram of an exhaust channel plate provided by an embodiment of the utility model.

[0040] The reference numerals in the specification are as follows:

[0041] 1. Single cell; 11. Shell; 12. Insulating film; 121. Side film; 122. End film; 13. First explosion-proof valve;

[0042] 2. Battery pack;

[0043] 3. tray; 31. frame; 32. exhaust channel plate; 321. flow channel plate; 322. inner plate; 3221. inlet; 323. exhaust guide block; 3231. outlet; 324. first exhaust channel;

[0044] 4. Cover plate;

[0045] 5. The second explosion-proof valve;

[0046] 6. Insulating member; 61. Through hole;

[0047] 7. The first structural adhesive;

[0048] 8. Second structural adhesive. DETAILED DESCRIPTION

[0049] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0050] like Figures 1 to 6 As shown, a single cell 1 provided by an embodiment of the utility model comprises a shell 11, a pole core, an insulating film 12 and a first explosion-proof valve 13. The pole core is accommodated in the shell 11, and the first explosion-proof valve 13 is installed on the shell 11. The first explosion-proof valve 13 is one of the safety protection devices of the single cell 1. When thermal runaway occurs inside the single cell 1 and the pressure is too high, it can be destroyed in time. The first explosion-proof valve 13 will automatically open to release the pressure inside the single cell 1, prevent the battery from exploding during thermal runaway, and ensure the safe operation of the battery.

[0051] The insulating film 12 includes a side film 121 and an end film 122. The shell 11 has an outer peripheral surface and two end surfaces. The outer peripheral surface extends axially between the two end surfaces. The side film 121 wraps the outer peripheral surface of the shell 11 in the circumferential direction. The end film 122 is attached to the two end surfaces. The outer surface of the shell 11 is completely wrapped by the side film 121 and the end film 122 to insulate the single battery 1, so that the first explosion-proof valve 13 will not contact the tray 3 of the battery pack and cause a short circuit. A lap joint is formed at the intersection of the side film 121 and the end film 122. The position of the first explosion-proof valve 13 on the shell 11 corresponds to the position of the lap joint. The insulating film 12 is a PET blue film.

[0052] In this embodiment, the side film and the end film wrap the shell, which can cover the first explosion-proof valve 13, and can prevent foreign matter from entering the explosion-proof valve and affecting its opening ability. During the normal operation of the single cell 1, the first explosion-proof valve 13 is wrapped by the insulating film 12 to avoid contact short circuit, and at the same time has a good protective effect, which can enhance the protection against liquid leakage and avoid the high-voltage safety risk caused by liquid leakage. On the other hand, by arranging the first explosion-proof valve 13 at a position close to the lap joint of the shell 11, a very short exhaust path of the first explosion-proof valve 13 can be achieved. The lap joint is formed by connecting the edge of the side film 121 and the edge of the end film 122, which is a weak area. When the single cell 1 is out of control, the first explosion-proof valve 13 is opened normally, and the gas generated inside the single cell 1 is discharged through the first explosion-proof valve 13. The gas will impact the weak area at the first time, thereby tearing the lap joint to achieve exhaust, and can release pressure in time.

[0053] In one embodiment, the overlap seam is located within the projection of the first explosion-proof valve 13 on the insulating film 12, so that the gas can open the overlap seam in time when thermal runaway occurs.

[0054] Preferably, the overlap seam is located so that the projection of the first explosion-proof valve 13 on the insulating film 12 is located in the middle of the first explosion-proof valve 13, so that the overlap seam is directly opposite to the first explosion-proof valve 13, so that the gas discharged from the first explosion-proof valve 13 can directly push open the overlap seam through the shortest path, thereby increasing the reliability of opening the first explosion-proof valve 13.

[0055] In one embodiment, the side film 121 and the end film 122 partially overlap at the junction to form an overlap area, the overlap seam is located at the edge of the overlap area, the overlap area covers part of the first explosion-proof valve 13, and the valve port of the first explosion-proof valve 13 faces the overlap area. The partial overlap of the side film 121 and the end film 122 can avoid the side film 121 and the end film 122 from warping.

[0056] In one embodiment, the end film 122 extends toward the side film 121, and the end film 122 can cover part of the side film 121 to form an overlap area, and the overlap area is located on the outer peripheral surface of the housing 11. In this embodiment, the surface area of ​​the end film 122 is greater than the surface area of ​​the end surface, and the part of the end film 122 that exceeds the end surface can be overlapped and covered on the side film 121 after being folded. At the overlap area, the side film 121 is attached to the outer surface of the housing 11, and the end film 122 is attached to the side film 121, and the end film 122 is located on the outside of the side film 121.

[0057] In another embodiment, the side film 121 extends toward the end film 122, and the part of the side film 121 covering the end film 122 forms an overlap region, and the overlap region is located on the end surface of the housing 11. In this embodiment, the surface area of ​​the side film 121 is greater than the surface area of ​​the outer peripheral surface, and the part of the side film 121 that exceeds the outer peripheral surface can overlap and cover the end film 122 after being folded. At the overlap region, the end film 122 is attached to the end surface of the housing 11, and the side film 121 is attached to the end film 122, and the side film 121 is located on the outside of the end film 122.

[0058] The overlapping areas formed by the above two overlapping methods both have good protective effects and will not affect the opening of the first explosion-proof valve.

[0059] In one embodiment, the length of the overlap region is 8 to 12 mm. Within the above range, the insulation reliability of the insulating film 12 to the first explosion-proof valve 13 can be ensured and the tearing and exhausting can be facilitated. After the end film 122 covers part of the side film 121, the edge warping problem of the insulating film 12 can also be avoided, thereby improving the safety performance of the single cell 1. Specifically, the length of the overlap region can be 8 mm, 9 mm, 10 mm, 11 mm and 12 mm.

[0060] In a preferred embodiment, the length of the overlapping area in the extension direction of the end film 122 is 10 mm, which can ensure that the overlapping area 122 has a good tearing exhaust effect and safety performance under the impact of high-pressure gas.

[0061] In one embodiment, the end membrane 122 includes a first end membrane and a second end membrane, and the shell 11 has a first end face and a second end face that are relatively arranged in a first direction. The first end membrane is attached to the first end face, and the second end membrane is attached to the second end face, which can provide insulation protection for both ends of the shell 11.

[0062] The overlap region includes a first overlap region and a second overlap region. The first end film extends toward the side film 121 and covers part of the side film 121 to form the first overlap region. The second end film extends toward the side film 121 and covers part of the side film 121 to form the second overlap region. The first end film and the second end film are square and have adhesive backing. The two ends of the first end film protrude from the first end face. The portion of the first end film that exceeds the first end face is folded and pasted on the side film 121 to form an overlap. The two ends of the second end film protrude from the second end face. The portion of the second end film that exceeds the second end face is folded and pasted on the side film 121 to form an overlap.

[0063] The first direction is the length direction of the battery, the first end face is the end face of the negative terminal of the single battery 1, the second end face is the end face of the positive terminal of the single battery 1, the first overlap area is close to the negative electrode of the single battery 1, and the second overlap area is close to the positive electrode of the single battery 1. The first explosion-proof valve 13 can be set on the first overlap area or the second overlap area according to the actual needs of the single battery 1.

[0064] In a specific embodiment, the first overlap area covers the first explosion-proof valve 13, the position of the first explosion-proof valve 13 on the housing 11 corresponds to the position of the first overlap area, the valve port of the first explosion-proof valve 13 faces the first overlap area, the gas generated inside the single cell 1 is discharged through the first explosion-proof valve 13, and the gas immediately impacts the first overlap area, thereby pushing open the first overlap area for exhaust. The first explosion-proof valve 13 is arranged close to the negative electrode of the single cell 1, so that the gas can be discharged more effectively.

[0065] In one embodiment, the side membrane 121 includes a first membrane, a second membrane, a third membrane and a fourth membrane connected in sequence, and the outer peripheral surface includes a first side surface, a second side surface, a third side surface and a fourth side surface. The first side surface and the third side surface are relatively arranged in the second direction, and the second side surface and the fourth side surface are relatively arranged in the third direction. The first direction, the second direction and the third direction are perpendicular to each other.

[0066] The first membrane is attached to the first side surface, the second membrane is attached to the second side surface, the third membrane is attached to the third side surface, and the fourth membrane is attached to the fourth side surface. The side membrane 121 is used to achieve circumferential insulation protection of the single battery 1 .

[0067] In one embodiment, the first explosion-proof valve 13 is disposed at the bottom of the housing 11, the first end face is the end face of the negative terminal of the single battery 1, and the second end face is the end face of the positive terminal of the single battery 1. After the single battery is placed in a manner that the first end face and the second end face are arranged relative to each other along the first direction, the side surface of the housing facing downward is the bottom of the housing 11. Alternatively,

[0068] On the outer peripheral surface of the shell 11, the surface area of ​​the first side is smaller than the surface area of ​​the second side, the first side is the bottom surface of the shell 11, the first diaphragm on the first side of the first end membrane covering part forms a first overlapping area, the third side opposite to the first side is the top surface of the shell 11, and the first explosion-proof valve is arranged on the first side.

[0069] When thermal runaway occurs, the gas in the battery will be discharged vertically downward and then discharged through the channels in the battery pack, which can reduce the impact of the gas on other parts in the battery pack.

[0070] On the other hand, Figures 3 to 6 As shown, an embodiment of the utility model provides a battery pack, including a battery group 2, the battery group 2 includes a plurality of single cells 1 of the above-mentioned embodiment, and the plurality of single cells 1 are stacked along a second direction.

[0071] The battery pack further includes a tray 3 , a cover plate 4 and a second explosion-proof valve 5 . The cover plate 4 is connected to the tray 3 to define an accommodating space for accommodating the battery pack 2 . The second explosion-proof valve 5 is disposed on the tray 3 .

[0072] The tray 3 is provided with a first exhaust channel 324, an inlet 3221 and an outlet 3231. The first exhaust channel 324 connects the inlet 3221 and the outlet 3231. The second explosion-proof valve 5 is provided at the outlet 3231. When the first explosion-proof valve 13 is opened, the high-pressure gas in the single battery 1 enters the first exhaust channel 324 through the first explosion-proof valve 13 and the inlet 3221 and is discharged through the second explosion-proof valve 5 at the outlet 3231.

[0073] When the single cell 1 is out of control, the gas generated inside the single cell 1 is discharged through the first explosion-proof valve 13, and the gas is introduced into the first exhaust channel 324 through the inlet 3221. As the pressure accumulates, the second explosion-proof valve 5 is pushed open, and the gas is finally discharged through the second explosion-proof valve 5 to achieve pressure relief of the battery pack. The first exhaust channel 324 not only realizes the flow of smoke after the single cell 1 is out of control, but also collects the electrolyte generated by condensation. When the first explosion-proof valve 13 is opened, a large amount of smoke with heat will be generated, and it will quickly condense into electrolyte when it encounters cold metal parts inside. The first exhaust channel 324 can provide a space for the electrolyte.

[0074] In other alternative embodiments, the second explosion-proof valve 5 is arranged on the cover plate 4, and the cover plate 4 is provided with a first exhaust channel, an inlet and an outlet, the first exhaust channel connects the inlet and the outlet, and when the first explosion-proof valve 13 is opened, the high-pressure gas in the single battery 1 enters the first exhaust channel through the first explosion-proof valve 13 and the inlet and is discharged through the second explosion-proof valve 5 at the outlet 3231.

[0075] In one embodiment, if Figure 3 , Figure 4 As shown, the tray 3 includes an exhaust channel plate 32 and a frame 31 arranged around the outer edge of the exhaust channel plate 32. The bottom surface of the battery pack 2 is bonded to the top surface of the exhaust channel plate 32. The exhaust channel plate 32 is located at the bottom of the tray 3. The first exhaust channel 324 and the inlet 3221 are arranged on the exhaust channel plate 32. The first explosion-proof valve 13 is arranged on the side of the single battery 1 close to the exhaust channel plate 32, that is, the first explosion-proof valve 13 is arranged at the bottom of the single battery 1 and faces the exhaust channel plate 32. Among them, the frame 31 is connected by welding with aluminum profiles, and the exhaust channel plate 32 is integrated with the frame 31 of the tray 3 by stir friction welding.

[0076] In this embodiment, by arranging the first explosion-proof valve 13 at the bottom of the single battery 1, when the first explosion-proof valve 13 is opened, the gas can be exhausted vertically downward, and the first explosion-proof valve 13 is directly opposite to the inlet 3221 on the exhaust channel plate 32. After the gas breaks through the first overlap area, it can be directly introduced into the first exhaust channel 324. As the pressure accumulates, the second explosion-proof valve 5 is opened to achieve pressure relief. During the exhaust process, the smoke directly enters the first exhaust channel 324 without passing through the inside of the battery pack and will not diffuse in the battery pack, which can reduce the impact of the smoke on the insulating parts inside the package and improve the safety level. After the smoke enters the first exhaust channel 324, the exhaust channel plate 32 provides a space for the electrolyte formed by the condensation of the high-temperature smoke, so that the first exhaust channel 324 is independent, and the thermal runaway smoke is isolated from the inside of the package, thereby improving the safety level of the battery pack and reducing the risk of thermal diffusion and fire.

[0077] In one embodiment, since the first exhaust channel 324 is arranged at the bottom of the tray 3, the thermal management system of the battery pack is arranged on the cover plate 4, and the cover plate 4 is provided with a flow channel, and the flow channel has a refrigerant to dissipate heat for the battery pack.

[0078] In one embodiment, the position of the first explosion-proof valve 13 is set corresponding to the position of the inlet 3221. There are multiple inlets 3221, and the first explosion-proof valves 13 of multiple single cells 1 are set one-to-one corresponding to the multiple inlets 3221. The positions of the multiple inlets 3221 are set according to the positions of the single cells 1, so that the valve port of each first explosion-proof valve 13 is directly connected to the corresponding inlet 3221. When any single cell 1 in the battery pack 2 has thermal runaway, the first explosion-proof valve 13 opens, and after tearing the first overlap area, it can vertically enter the first exhaust channel 324 from the corresponding inlet 3221 in time, reducing the smoke in the battery pack and reducing the accumulation of condensed electrolyte in the battery pack.

[0079] The number of the inlets 3221 is consistent with the number of the single cells 1, and the position of the inlets 3221 is determined according to the assembly position of the single cells 1 in the battery pack. Specifically, the positive and negative electrodes of the multiple single cells 1 in the battery pack are arranged alternately, that is, in two adjacent single cells 1, the negative electrode of one single cell 1 and the positive electrode of the other single cell 1 are located on the same side, and correspondingly, the inlets 3221 are arranged in two rows, so that each inlet 3221 corresponds to the first explosion-proof valve 13 of each single cell 1.

[0080] In one embodiment, if Figure 5 , Figure 6 As shown, the exhaust channel plate 32 includes a flow channel plate 321 and an inner plate 322, the inlet 3221 is arranged on the inner plate 322, the flow channel plate 321 is arranged on the side of the inner plate 322 away from the battery pack 2, and the flow channel plate 321 is provided with a first flow channel groove recessed in the direction away from the inner plate 322. The inner plate 322 is flat, and the flow channel plate 321 is connected to the inner plate 322 by a stamping and brazing process, thereby covering the first flow channel groove and defining a first exhaust channel 324. After the gas pushes open the first overlap area, it enters the flow channel groove through the inlet 3221 on the inner plate 322, and the gas can flow in the first exhaust channel 324.

[0081] In another embodiment, the tray 3 further includes a bottom plate, which is welded and integrated with the frame 31 of the tray 3, and the exhaust channel plate 32 is connected to the bottom plate. On the side surface of the flow channel plate 321 facing the bottom plate, a second flow channel groove is formed between two adjacent first flow channel grooves, and the bottom plate can cover the second flow channel groove to define a second exhaust channel. The first exhaust channel is located between the flow channel plate 321 and the inner plate 322, and the second exhaust channel is located between the flow channel plate 321 and the bottom plate, and the gas in thermal runaway can be discharged from the first exhaust channel and / or the second exhaust channel.

[0082] In one embodiment, if Figure 3As shown, the tray 3 also includes an exhaust guide block 323, an outlet 3231 is arranged on the exhaust guide block 323, a guide channel is arranged on the exhaust guide block 323, the guide channel connects the first exhaust channel 324 and the outlet 3231, the second explosion-proof valve 5 is installed at the outlet 3231 of the exhaust guide block 323, and the first explosion-proof valves 13 of the multiple single batteries 1 guide the smoke into the first exhaust channel 324 through the corresponding inlet 3221. As the pressure accumulates, the second explosion-proof valve 5 can be pushed open, so that the gas is discharged through the exhaust guide block 323.

[0083] The exhaust guide block 323 is arranged on the inner plate 322 of the exhaust channel plate 32, or the exhaust guide block 323 is arranged on the frame 31. After the exhaust channel plate 32 is integrated on the frame 31, the exhaust guide block 323 can guide air.

[0084] In one embodiment, if Figure 3 As shown, the battery pack also includes at least one insulating member 6, which is arranged between the battery group 2 and the tray 3. A through hole 61 is arranged on the insulating member 6. The position of the through hole 61 corresponds to the position of the inlet 3221, and the position of the first explosion-proof valve 13 corresponds to the position of the through hole 61, that is, the first explosion-proof valve 13, the through hole 61 and the inlet 3221 are arranged correspondingly.

[0085] The insulating member 6 is a PET sheet. Pasting the insulating member 6 on the exhaust channel plate 32 of the tray 3 can prevent the battery pack 2 from directly contacting the tray 3 and increase the creepage distance between the battery cell and the inner plate 322 at the bottom of the tray 3.

[0086] Preferably, two insulating members 6 are provided, the outlets 3231 are arranged in two rows, and one insulating member 6 is provided at the inlet 3221 of each row.

[0087] In an alternative embodiment, a weak portion is provided on the insulating member 6, and the position of the weak portion corresponds to the position of the inlet 3221, and the position of the first explosion-proof valve 13 corresponds to the position of the weak portion. After the high-pressure gas rushing out of the first explosion-proof valve 13 breaks open the weak portion, it enters the first exhaust channel 324 and / or the second exhaust channel through the inlet 3221.

[0088] In one embodiment, if Figure 3 As shown, the battery pack further includes a first structural adhesive 7, the cover plate 4 is arranged on the side of the battery pack 2 away from the tray 3, the first structural adhesive 7 is arranged between the cover plate 4 and the battery pack 2, the cover plate 4 and the battery pack 2 are bonded by the first structural adhesive 7, the first structural adhesive 7 has a heat conductive effect, and can transfer the heat generated by the battery pack 2 to the cover plate 4, and dissipate the heat through the refrigerant in the cover plate 4. And / or,

[0089] The battery pack also includes a second structural adhesive 8, which is arranged between the battery pack 2 and the tray 3. The battery pack 2 and the exhaust channel plate 32 of the tray 3 are bonded by the second structural adhesive 8. The insulating member 6 is located between the second structural adhesive 8 and the tray 3 to further avoid contact between the battery pack 2 and the tray 3.

[0090] In another aspect, an embodiment of the present invention provides an electric device, comprising the battery pack of the above embodiment. The electric device mentioned here can be a vehicle, an energy storage system, a ship or an aircraft.

[0091] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A single cell battery, characterized in that: It comprises a shell, a pole core, an insulating film and a first explosion-proof valve, wherein the pole core is accommodated in the shell, and the first explosion-proof valve is installed on the shell; The insulating film includes a side film and an end film, the shell has an outer peripheral surface and two end surfaces, the outer peripheral surface extends axially between the two end surfaces, the side film wraps the outer peripheral surface along the circumferential direction, the end film is attached to the two end surfaces, and a lap joint is formed at the junction of the side film and the end film, and the position of the first explosion-proof valve on the shell corresponds to the position of the lap joint.

2. The single cell according to claim 1, characterized in that: The lap joint is located within the projection of the first explosion-proof valve on the insulating film.

3. The single cell according to claim 2, characterized in that: The projection of the overlap seam on the first explosion-proof valve is located in the middle of the first explosion-proof valve.

4. The single cell according to claim 1, characterized in that: The side membrane and the end membrane partially overlap at the junction to form an overlapping area, the overlapping seam is located at the edge of the overlapping area, and the overlapping area covers a portion of the first explosion-proof valve.

5. The single cell according to claim 4, characterized in that: The end film covers a portion of the side film to form the overlapping area, and the overlapping area is located on the outer peripheral surface.

6. The single cell according to claim 4, characterized in that: The side film covers a portion of the end film to form the overlapping area, and the overlapping area is located on the end surface.

7. The single cell according to claim 4, characterized in that: The length of the overlapping area is 8 to 12 mm.

8. The single cell according to claim 4, characterized in that: The end film comprises a first end film and a second end film, the housing has a first end surface and a second end surface arranged opposite to each other, the first end film is attached to the first end surface, and the second end film is attached to the second end surface; The overlapping area includes a first overlapping area and a second overlapping area. The first end film extends toward the side film and covers a portion of the side film to form the first overlapping area. The second end film extends toward the side film and covers a portion of the side film to form the second overlapping area.

9. The single cell according to claim 8, characterized in that: The first overlapping area covers the first explosion-proof valve, and the position of the first explosion-proof valve on the housing is arranged corresponding to the position of the first overlapping area.

10. The single cell according to claim 1, characterized in that: The side membrane includes a first membrane sheet, a second membrane sheet, a third membrane sheet and a fourth membrane sheet connected in sequence, the outer peripheral surface includes a first side surface, a second side surface, a third side surface and a fourth side surface, the first side surface and the third side surface are arranged opposite to each other, and the second side surface and the fourth side surface are arranged opposite to each other; The first diaphragm is attached to the first side surface, the second diaphragm is attached to the second side surface, the third diaphragm is attached to the third side surface, and the fourth diaphragm is attached to the fourth side surface.

11. The single cell according to claim 10, characterized in that: The first explosion-proof valve is arranged at the bottom of the housing, or the surface area of ​​the first side surface is smaller than the surface area of ​​the second side surface, and the first explosion-proof valve is arranged on the first side surface.

12. A battery pack, characterized in that: A battery pack is provided, wherein the battery pack comprises a plurality of single batteries according to any one of claims 1 to 11.

13. The battery pack according to claim 12, characterized in that: It also includes a tray, a cover plate and a second explosion-proof valve, wherein the cover plate is connected to the tray to define an accommodating space for accommodating the battery pack, and the second explosion-proof valve is arranged on the tray and / or the cover plate; A first exhaust channel, an inlet and an outlet are provided on the tray and / or the cover plate, the first exhaust channel connects the inlet and the outlet, the second explosion-proof valve is provided at the outlet, and when the first explosion-proof valve is opened, the high-pressure gas in the single battery can enter the first exhaust channel through the first explosion-proof valve and the inlet and be discharged through the second explosion-proof valve.

14. The battery pack according to claim 13, wherein: The position of the first explosion-proof valve is arranged corresponding to the position of the inlet.

15. The battery pack according to claim 13, characterized in that: The tray includes an exhaust channel plate and a frame arranged around the outer edge of the exhaust channel plate, the bottom surface of the battery pack is connected to the exhaust channel plate, the first exhaust channel and the inlet are arranged on the exhaust channel plate, and the first explosion-proof valve is arranged on a side of the single battery close to the exhaust channel plate.

16. The battery pack according to claim 15, characterized in that: The exhaust channel plate comprises a flow channel plate and an inner plate, the inlet is arranged on the inner plate, and the flow channel plate is arranged on a side of the inner plate away from the battery pack; The flow channel plate is provided with a first flow channel groove which is recessed in a direction away from the inner plate, and the flow channel plate is attached to the inner plate to define the first exhaust channel; And / or, the tray further includes a bottom plate, the exhaust channel plate is arranged on the bottom plate, a second flow channel groove is formed between two adjacent first flow channel grooves, and the bottom plate covers the second flow channel groove to define a second exhaust channel.

17. The battery pack according to claim 15, characterized in that: The tray further includes an exhaust guide block, the outlet is arranged on the exhaust guide block, a guide channel is arranged on the exhaust guide block, and the guide channel connects the exhaust channel and the outlet.

18. The battery pack according to claim 17, wherein: The exhaust guide block is arranged on the exhaust channel plate, or, The exhaust guide block is arranged on the frame.

19. The battery pack according to claim 13, wherein: The battery pack further includes at least one insulating member, which is disposed between the battery group and the tray. A through hole is disposed on the insulating member, and a position of the first explosion-proof valve corresponds to a position of the through hole.

20. The battery pack according to claim 13, wherein: The battery pack further includes a first structural adhesive, which is disposed between the cover plate and the battery pack; and / or the battery pack further includes a second structural adhesive, which is disposed between the battery pack and the tray.

21. An electrical device, characterized in that: A battery pack comprising any one of claims 12-20.

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