Battery monomer, battery pack, power utilization device and energy storage device

Abstract

The utility model relates to the technical field of batteries, and provides a single battery, a battery pack, a power utilization device and an energy storage device, the single battery comprises a shell and at least two groups of naked battery cells, and an accommodating cavity is formed in the shell; the at least two groups of naked battery cells are arranged in the accommodating cavity, each naked battery cell comprises at least two layers of pole pieces, the at least two layers of pole pieces are laminated along the thickness direction, the naked battery cells in the same group are laminated along the thickness direction, and the naked battery cells in different groups are spread along a plane vertical to the thickness direction. Different groups of naked battery cells are spread along a plane perpendicular to the thickness direction, so that the number of the superposed naked battery cells is reduced, large surfaces of the different groups of naked battery cells do not extrude each other, the expansive force of the large surfaces can be reduced, the risk of pole piece breakage is reduced, and the service life of a single battery is prolonged.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery pack, an electrical device and an energy storage device. Background Art

[0002] Batteries are increasingly used in life and production. For example, new energy vehicles equipped with batteries have been widely used, and batteries can be used to provide power for new energy vehicles in whole or in part. In addition, batteries are increasingly used in the field of energy storage, etc.

[0003] In the related art, during the long-term cycle use of the battery, the bare battery cell is prone to problems such as excessive expansion force of the electrode sheet leading to rupture. Utility Model Content

[0004] In view of this, the embodiments of the present application hope to provide a battery cell, a battery pack, an electrical device and an energy storage device, which can improve the problem of rupture caused by excessive expansion force of the electrode sheet.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the embodiment of the present application is implemented as follows:

[0006] A first aspect of an embodiment of the present application provides a battery cell, including:

[0007] A housing is formed with a receiving cavity;

[0008] At least two groups of bare battery cells are arranged in the accommodating cavity, and each of the bare battery cells includes at least two layers of pole pieces. The at least two layers of pole pieces are stacked along the thickness direction. The bare battery cells in the same group are stacked along the thickness direction, and the bare battery cells in different groups are spread along a plane perpendicular to the thickness direction.

[0009] In this embodiment, different groups of bare cells are spread along a plane perpendicular to the thickness direction, thereby reducing the number of stacked bare cells. The large surfaces of different groups of bare cells will not squeeze each other, which can reduce the expansion force of the large surfaces, reduce the risk of electrode breakage, and improve the life of the battery cell.

[0010] In some embodiments, the total thickness of each group of bare cells in the thickness direction is 30 mm to 80 mm.

[0011] In this embodiment, a single bare battery cell includes at least two layers of pole pieces, each group of bare battery cells includes at least one bare battery cell, the total thickness of each group of bare battery cells in the thickness direction is 30 mm to 80 mm, and the extrusion pressure and energy density between the pole pieces of each group of bare battery cells are moderate, thereby reducing the risk of pole piece rupture while taking into account the energy density.

[0012] In some embodiments, the thickness dimension of a single bare cell is 8 mm to 20 mm.

[0013] In this embodiment, the manufacturing difficulty of the bare cell is moderate, the yield rate can be improved, and the energy density of the bare cell is appropriate.

[0014] In some embodiments, the number of bare cells in each group is 1 to 4.

[0015] In this embodiment, the difficulty of stacking can be reduced.

[0016] In some embodiments, each of the bare battery cells includes a pole ear connected to the pole piece, and the two pole ears are located on the same side of the bare battery cell or on two opposite sides of the bare battery cell.

[0017] In this embodiment, the two tabs are located on the same side of the bare cell. With this design, the two bare cells can be connected in parallel or in series. The two tabs are located on opposite sides of the bare cell. With this design, the two bare cells can be connected in series.

[0018] In some embodiments, the battery cell includes at least two adapter plates disposed in the accommodating cavity, the two pole tabs of the bare battery cell are respectively a positive pole tab and a negative pole tab, and the positive pole tab and the negative pole tab of each bare battery cell are respectively connected to the two adapter plates.

[0019] In this embodiment, the bare cells are connected in parallel.

[0020] In some embodiments, the battery cell includes at least three adapter plates all arranged in the accommodating cavity, wherein the three adapter plates are respectively a first adapter plate, a second adapter plate and a third adapter plate, the two pole tabs of the bare battery cell are respectively a positive pole tab and a negative pole tab, all the bare battery cells are divided into a first unit and a second unit, the positive pole tab of the first unit is connected to the first adapter plate, the negative pole tab of the second unit is connected to the second adapter plate, and the negative pole tab of the first unit and the positive pole tab of the second unit are both connected to the third adapter plate.

[0021] In this embodiment, the bare cells are connected in series.

[0022] In some embodiments, the battery cell includes a thermal insulation pad disposed in the accommodating cavity, the combined structure formed by the tab and the adapter is close to the first side of the housing, and the thermal insulation pad is located between the first side and the combined structure.

[0023] In this embodiment, the heat insulation pad can play two roles of heat insulation and insulation. In the process of welding the pole ear and the adapter, the heat insulation pad can isolate the welding residual heat of the adapter and the pole ear.

[0024] In some embodiments, the battery cell includes an insulating frame disposed in the accommodating cavity, the insulating frame is formed with at least two isolation cavities, and the bare cells in the same group are disposed in the isolation cavities.

[0025] In this embodiment, the insulating frame can provide insulation, and the bare battery cell is insulated and isolated from the outer shell by the insulating frame, thereby preventing the outer shell from being charged to a certain extent.

[0026] In some embodiments, the insulating frame includes a support frame and two supporting frames, the two supporting frames are spaced apart along a first direction, the supporting frame forms the isolation cavity, and opposite sides of the two supporting frames form avoidance openings, at least part of the pole ear of the bare battery cell extends out of the avoidance opening, and the support frame is supported between the two supporting frames.

[0027] In this embodiment, on the one hand, the support frame plays a role in supporting and isolating the bare cells, so that the bare cells are arranged at intervals along the first direction. On the other hand, the support frame can support the two support frames, play a role in positioning and limiting the support frames, not only preventing the two support frames from moving, but also preventing the bare cells from slipping out of the avoidance opening, playing a role in limiting and fixing the bare cells.

[0028] In some embodiments, the support frame includes a support rod and two baffles, the two baffles are spaced apart along a first direction, the two baffles are respectively connected to two supporting frames, and the support rod connects the two baffles.

[0029] In this embodiment, the baffle blocks the avoidance opening to stop the bare battery cell. The support rod can strengthen the structural strength of the two baffles and limit the deformation of the two baffles.

[0030] In some embodiments, one of the supporting frame and the supporting frame is formed with a slot, and the other of the supporting frame and the supporting frame is formed with a protrusion, and the protrusion is inserted into the slot.

[0031] In this embodiment, the protrusion and the slot are snap-fitted to facilitate rapid positioning and assembly of the supporting frame and the support frame.

[0032] In some embodiments, an insulating film layer is provided on the top surface of the bare battery cell along the thickness direction.

[0033] In this embodiment, the insulating film layer can prevent the top surface of the bare battery cell from directly contacting the outer shell so that the outer shell becomes charged.

[0034] In some embodiments, the battery cell includes a pole, and the pole is disposed on a peripheral side of the housing.

[0035] In this embodiment, compared with the arrangement of the pole on the top surface or the bottom surface of the housing, the pole can be prevented from interfering with the placement of the bare battery cell, and external objects can be prevented from pressing the pole from the top and bottom directions.

[0036] In some embodiments, the two poles are respectively located on both sides of the housing along the second direction or the first direction, wherein the first direction, the second direction and the thickness direction are perpendicular to each other.

[0037] In this embodiment, the two poles are respectively located on two different sides of the housing, so that the two poles are electrically connected to the two adapter plates respectively.

[0038] A second aspect of an embodiment of the present application provides a battery pack, characterized in that it includes a battery cell and a box body as described in any one of the above, the box body includes a bottom plate and a top cover, and the angle between the thickness direction of the bare battery cell and the plane where the bottom plate is located is 80 degrees to 90 degrees.

[0039] In this embodiment, the angle between the thickness direction of the bare battery cell and the plane where the bottom plate is located is 80 to 90 degrees. The bare batteries of different groups are spread out, and the height of the upper surface of the bare batteries in a single battery cell can be relatively low, thereby shortening the infiltration distance of the electrolyte in the outer shell, providing more electrolyte infiltration channels, and facilitating all bare batteries to be immersed in the electrolyte, solving the problem of poor electrolyte infiltration, thereby avoiding the appearance of purple spots, round spots and blank spaces on the bare batteries.

[0040] In some embodiments, the battery pack includes a buffer pad, a plurality of the battery cells are stacked to form a module, and at least one buffer pad is disposed between two adjacent battery cells in the module.

[0041] In this embodiment, during the use of the battery pack, the battery cells will continue to expand, and the buffer pad can alleviate the expansion force generated during use, thereby playing a role in buffering and vibration isolation.

[0042] In some embodiments, the housing includes a liquid cooling plate, and the liquid cooling plate is located between the battery cells and the bottom plate.

[0043] In this embodiment, the liquid cooling plate is used to perform heat exchange with the battery cell to adjust the temperature of the battery cell. The liquid cooling plate is located between the battery cell and the bottom plate so as to contact with a larger area of ​​the battery cell, thereby improving the heat exchange efficiency.

[0044] A third aspect of an embodiment of the present application provides an electrical device, characterized in that it includes a battery pack as described above.

[0045] A fourth aspect of an embodiment of the present application provides an energy storage device, characterized in that it includes a battery pack as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 In the related art, when the thickness of the bare cell is 40 mm, the expansion force of the bare cell changes with SOH;

[0047] Figure 2 In the related art, when the thickness of the bare battery cell is 40 mm, the elongation at break of the positive electrode sheet of the bare battery cell changes with SOH;

[0048] Figure 3 This is a schematic diagram of the structure of a battery cell in an embodiment of the present application;

[0049] Figure 4 for Figure 3 An exploded schematic diagram of a battery cell is shown, wherein the support frame is not shown;

[0050] Figure 5 for Figure 3 A schematic diagram of a partial structure of a battery cell shown;

[0051] Figure 6 for Figure 5 The enlarged schematic diagram of point A in the middle;

[0052] Figure 7 Another exploded schematic diagram of a battery cell in an embodiment of the present application, wherein the top cover is not shown;

[0053] Figure 8 This is a schematic diagram of the structure of a unit in an embodiment of the present application;

[0054] Fig. 9 Schematic diagram of an explosion of a battery pack in one embodiment of the present application.

[0055] Description of Reference Numerals

[0056] Shell 1; accommodating cavity 1a; top cover 11; shell 12; bare cell 2; large surface 2a; pole ear 21; main body 22; unit 100; adapter plate 3; sheet body 31; vertical portion 32; thermal insulation pad 4; pole 5; insulating frame 6; isolation cavity 6a; support frame 61; support rod 611; baffle 612; supporting frame 62; avoidance opening 62a; slot 601; protrusion 602; frame 621; support plate 622; battery cell 10; buffer pad 20; box body 30; liquid cooling plate 301; top cover 302; side panel 303; terminal board 40; module 200. DETAILED DESCRIPTION

[0057] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0059] In the description of the embodiments of the present application, technical terms such as "first", "second", etc. are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0060] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0061] In the embodiment of the present application, at least two groups include two groups and more than two groups. At least two include two groups and more than two groups. The unit "mm" is millimeter. In the embodiment of the present application, down refers to the direction toward the ground, and up is opposite to down.

[0062] The embodiment of the present application provides a battery cell 10, and the embodiment of the present application also provides a battery pack including the battery cell 10 in any embodiment of the present application. The electric device provided in the embodiment of the present application includes the battery pack in any embodiment of the present application. The energy storage device provided in the embodiment of the present application includes the battery pack in any embodiment of the present application.

[0063] The battery cell 10 provided in the embodiment of the present application can be used alone. The battery cell 10 provided in the embodiment of the present application can be used as an energy storage battery and / or a power battery. The battery cell 10 can also be used as a battery pack. The battery cell 10 and the battery pack can be used, but not limited to, in an electrical device or an energy storage device. Electrical devices include, but are not limited to, mobile phones, tablets, laptops, electric toys, electric tools, vehicles, ships or spacecraft, etc. Among them, spacecraft may include airplanes, rockets, space shuttles and spacecraft, etc. Energy storage devices include energy storage containers or energy storage systems, etc.

[0064] Taking the example of a vehicle as an electrical device in one embodiment of the present application, the vehicle may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery pack is provided inside the vehicle, and the battery pack may be provided at the bottom of the vehicle or at the front or rear of the vehicle. The battery pack may be used to power the vehicle, for example, the battery pack may be used as an operating power source for the vehicle. In some embodiments, the battery pack may be used not only as an operating power source for the vehicle, but also as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0065] The battery pack may include at least two battery cells 10, and the at least two battery cells 10 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection means that at least two battery cells 10 are both connected in series and in parallel. At least two battery cells 10 may be directly connected in series, in parallel, or in a hybrid connection; of course, the battery cell 10 may also be a module formed by first connecting at least two battery cells 10 in series, in parallel, or in a hybrid connection, and then at least two modules are connected in series, in parallel, or in a hybrid connection to form a whole.

[0066] In the embodiment of the present application, the battery cell 10 may be a secondary battery. A secondary battery refers to a battery that can be continuously used by activating active materials by charging after the battery is discharged.

[0067] The battery cell 10 may be a lithium-ion battery, a sodium-lithium-ion battery, a sodium-ion battery, or a lithium-sulfur battery, etc., which is not limited in the embodiment of the present application.

[0068] In the related art, the size of a single bare cell along the thickness direction is relatively large. The thickness direction refers to the direction in which the electrode sheets of the bare cell are stacked. The large surface of the bare cell is perpendicular to the thickness direction. For example, please refer to Figure 1 and Figure 2 , Figure 1 The expansion force of the bare cell changes with SOH when the thickness of the bare cell is 40 mm; Figure 2 When the thickness of the bare cell is 40 mm, the elongation at break of the positive electrode sheet of the bare cell changes with SOH, where Q1 is the minimum value and Q2 is the average value. Figure 2The area to the right of the average value Q2 is the fracture risk area; in one case, a single bare cell in the battery pack is arranged in the up-down direction, and at least two bare cells are arranged in the horizontal direction, that is, the thickness direction of the bare cell is perpendicular to the up-down direction, and the large surface of the bare cell is perpendicular to the horizontal direction. In another case, a single bare cell in the battery pack is arranged in the horizontal direction, and all bare cells are stacked in the up-down direction, that is, the thickness direction is parallel to the up-down direction. There is a problem that the pole pieces are easily broken when all bare cells are stacked in the up-down direction. In the above two cases, if the size of the battery cell is increased, for example, the thickness of the bare cell, the width of the bare cell and the width of the pole piece will increase significantly; if the size of the pole piece is increased, the electrolyte creepage and return distance in the up-down direction will increase, and there will be problems such as poor electrolyte infiltration (white space), broken bridge (electrolyte interruption), etc. If the battery cell is a lithium-ion battery, lithium precipitation is also prone to occur.

[0069] See also Figure 3 and Figure 4 The battery provided in the embodiment of the present application includes a housing 1 and at least two groups of bare cells 2, and the housing 1 is formed with a receiving cavity 1a. The at least two groups of bare cells 2 are arranged in the receiving cavity 1a, and each bare cell 2 includes at least two layers of pole pieces, and the at least two layers of pole pieces are stacked along the thickness direction. The bare cells 2 in the same group are stacked along the thickness direction, and the bare cells 2 in different groups are spread along a plane perpendicular to the thickness direction.

[0070] See also Figure 4 and Figure 7 , the bare cells 2 of the same group are stacked in the thickness direction. Exemplarily, the large surface 2a of a single bare cell 2 is parallel to the plane perpendicular to the thickness direction.

[0071] Please continue reading Figure 4 and Figure 7 , different groups of bare battery cells 2 are spread along a plane perpendicular to the thickness direction, that is, different groups of bare battery cells 2 are not stacked along the thickness direction, but are laid flat along the first plane.

[0072] In the battery cell 10 provided in the embodiment of the present application, different groups of bare cells 2 are spread along a plane perpendicular to the thickness direction, thereby reducing the number of stacked bare cells 2. The large surfaces 2a of different groups of bare cells 2 will not squeeze each other, which can reduce the expansion force of the large surface 2a, reduce the risk of electrode breakage, and improve the life of the battery cell 10.

[0073] Taking each group of bare cells 2 including one bare cell as an example, different groups of bare cells 2 are spread along a plane perpendicular to the thickness direction. In other words, all bare cells 2 are spread along a plane perpendicular to the thickness direction, so that the large surfaces 2a of all bare cells 2 are roughly coplanar. In this way, the outer contour of the bare cell 2 is roughly rectangular, and the appearance of the battery cell 10 is roughly a flat structure. The large surfaces 2a of each bare cell 2 will not overlap, and the large surfaces 2a of each bare cell 2 will not squeeze each other, which can significantly reduce the expansion force of the bare cell 2.

[0074] The bare cell 2 is the energy storage structure of the battery cell 10. In one embodiment, please refer to Figure 8 , the bare battery cell 2 includes a separator and a pole ear 21. At least part of the two layers of pole sheets is a positive pole sheet, and the rest of the at least two layers of pole sheets is a negative pole sheet. The separator is arranged between the positive pole sheet and the negative pole sheet, and the positive pole sheet and the negative pole sheet are respectively provided with pole ears 21. The separator is used to isolate the positive pole sheet and the negative pole sheet to avoid short circuit between the two. The positive pole sheet, the negative pole sheet and the separator can be wound or stacked. The bare battery cell 2 is composed of at least two layers of pole sheets and a separator to form a main body 22, and the outer contour of the main body 22 is roughly rectangular. The battery cell 10 realizes charging or discharging by the movement of metal ions in the electrolyte between the positive pole sheet and the negative pole sheet.

[0075] In some embodiments, the battery cell 10 includes an electrolyte, and the electrolyte is disposed in the receiving cavity 1 a.

[0076] The battery pack provided in the embodiment of the present application includes the battery cell 10, the bottom plate and the top cover 302 in any embodiment of the present application, and the angle between the thickness direction of the bare battery cell 2 and the plane where the bottom plate is located is 80 degrees to 90 degrees. The top cover 302 and the bottom plate are arranged opposite to each other along the top and bottom directions.

[0077] Exemplarily, the angle between the thickness direction of the bare battery cell 2 and the plane where the bottom plate is located is 80 degrees, 85 degrees, or 90 degrees, etc.

[0078] In the battery pack provided in the embodiment of the present application, the angle between the thickness direction of the bare battery cells 2 and the plane where the bottom plate is located is 80 to 90 degrees. The bare battery cells 2 of different groups are spread out, and the height of the upper surface of the bare battery cells 2 in a single battery cell 10 can be relatively low, thereby shortening the infiltration distance of the electrolyte in the outer shell 1, providing more electrolyte infiltration channels, and facilitating all the bare battery cells 2 to be immersed in the electrolyte, thereby solving the problem of poor electrolyte infiltration, thereby avoiding the appearance of purple spots, round spots and blank spaces on the bare battery cells 2.

[0079] In the related art, poor electrolyte wetting can generally be divided into two situations. One is that the bare cell is too high in the up and down directions, exceeding the electrolyte wetting height in the initial state. The other is that as time and the number of cycles increase, the electrolyte in the battery cell gradually decreases due to volatilization or consumption, and the bare cell will gradually have the problem of poor electrolyte wetting.

[0080] In some embodiments, the height of the bare cell 2 from the bottom plate may be 30 mm to 80 mm. Exemplarily, the height of the bare cell 2 from the bottom plate may be 30 mm, 40 mm, 50 mm, 60 mm or 80 mm.

[0081] Exemplarily, the thickness direction is perpendicular to the horizontal plane, that is, the large surface 2a of a single bare cell 2 is parallel to the horizontal plane. The bare cells 2 of different groups are spread perpendicular to the horizontal plane.

[0082] For example, each group of bare cells 2 includes one bare cell. Different groups of bare cells 2 are spread along a horizontal plane. Please continue to refer to Figure 4 and Figure 7 In a single battery cell 10, the large surface 2a of a single bare cell 2 faces up and down respectively, and the bare cells 2 of different groups are spread along the horizontal plane, that is, all bare cells 2 are laid flat along the horizontal plane. In this way, all bare cells 2 are roughly at the same level. In this way, the appearance of the battery cell 10 is roughly a flat structure placed horizontally.

[0083] In the battery pack provided in the embodiment of the present application, the bare cells 2 are arranged along the horizontal plane, and the bare cells 2 of different groups are spread along the horizontal plane. The height of the upper surface of the bare cells 2 in a single battery cell 10 can be relatively low, shortening the infiltration distance of the electrolyte in the outer shell 1, providing more electrolyte infiltration channels, and facilitating all the bare cells 2 to be immersed in the electrolyte, thereby solving the problem of poor electrolyte infiltration, thereby avoiding the appearance of purple spots, round spots and blank spaces on the bare cells 2.

[0084] In some embodiments, the total thickness of each group of bare cells 2 in the thickness direction is 30 mm to 80 mm. The total thickness of each group of bare cells 2 in the thickness direction refers to the sum of the thicknesses of the bare cells 2 in the same group. Exemplarily, the total thickness of each group of bare cells 2 in the thickness direction is 30 mm, 40 mm, 45 mm, 50 mm, 60 mm, 70 mm or 80 mm, etc. A single bare cell 2 includes at least two layers of pole pieces, and each group of bare cells 2 includes at least one bare cell 2. The total thickness of each group of bare cells 2 in the thickness direction is 30 mm to 80 mm. The extrusion pressure and energy density between the pole pieces of each group of bare cells 2 are moderate, and the risk of pole piece rupture is reduced while taking into account the energy density.

[0085] In some embodiments, the size of a single bare cell in the thickness direction is 8mm to 20mm. Exemplarily, the size of a single bare cell in the thickness direction is 8mm, 10mm, 12mm, 13mm, 15mm or 20mm, etc. The size of a single bare cell 2 in the thickness direction is 8mm to 20mm, the manufacturing difficulty of the bare cell 2 is moderate, the yield rate can be improved, and the energy density of the bare cell 2 is appropriate.

[0086] In some embodiments, the number of bare cells in each group is 1 to 4. The number of bare cells in each group refers to the number of bare cells in the same group. Exemplarily, the number of bare cells in each group is 1, 2, 3 or 4. Such a design can reduce the difficulty of stacking.

[0087] In some embodiments, the material of the isolation membrane includes but is not limited to polypropylene and / or polyethylene, etc.

[0088] In some embodiments, the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, and the positive electrode active material layer is attached to the surface of the positive electrode current collector. The tab 21 connected to the positive electrode sheet is defined as the positive electrode tab 21, and the material of the positive electrode tab 21 can be a positive electrode current collector without a positive electrode active material layer attached.

[0089] In some embodiments, the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is attached to the surface of the negative electrode current collector. The tab 21 connected to the negative electrode sheet is defined as the negative electrode tab 21, and the material of the negative electrode tab 21 can be the negative electrode current collector without the negative electrode active material layer attached.

[0090] In some embodiments, the negative electrode sheet may only include a negative electrode current collector without a negative electrode active material layer attached. After the battery cell 10 is charged for the first time, the metal in the positive electrode sheet material migrates to the surface of the negative electrode current collector to form a metal layer on the surface of the negative electrode current collector.

[0091] Taking the battery cell 10 as a lithium-ion battery as an example, in one embodiment, the material of the positive electrode current collector can be aluminum, and the positive electrode active material layer can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The material of the negative electrode current collector can be copper, and the negative electrode active material layer can be carbon or silicon, etc.

[0092] The battery cell 10 provided in the embodiment of the present application may be a large-size battery. For example, in one embodiment, please refer to Figure 1, the length L of the outer shell 1 can be 300mm to 1500mm, the width W is 200mm to 800mm, and the thickness H is 40mm to 330mm. The thickness direction of the outer shell 1 is consistent with the thickness direction of the bare battery cell 2, and the battery cell 10 is a flat structure placed horizontally as a whole. In this embodiment, the battery cell 10 is a large-size battery. Exemplarily, the bare battery cells 2 are arranged in the horizontal direction and different groups of bare battery cells 2 are spread in the horizontal direction, the electrolyte infiltration distance is shortened, and electrolyte infiltration channels in four directions can be provided to solve the problem of poor electrolyte infiltration.

[0093] In one embodiment, please refer to Figure 4 The housing 1 includes a top cover 11 and a shell 12. The shell 12 is a hollow structure with an opening on the top side. The top cover 11 closes the top opening of the shell 12 to jointly define a receiving chamber 1a.

[0094] It should be noted that the top side and the bottom side are opposite sides along the thickness direction of the bare battery cell.

[0095] The top cover 11 and the housing 12 may be detachably connected or non-detachably connected. The top cover 11 and the housing 12 may be sealed and the accommodating chamber 1a may be a sealed chamber. For example, the top cover 11 and the housing 12 may be welded, such as by laser welding. In this way, the top cover 11 and the housing 12 are sealed and connected by welding.

[0096] The top cover 11 and the shell 12 may be made of the same material. Exemplarily, the top cover 11 and the shell 12 are both made of at least one of aluminum and steel.

[0097] In one embodiment, please refer to Figure 4 and Figure 8 Each bare battery cell 2 includes at least two pole ears 21 connected to the pole piece.

[0098] In one embodiment, please refer to Figure 4 and Figure 8 , the two tabs 21 are located on the same side of the bare battery core 2. With such a design, the two bare battery cores 2 can be connected in parallel or in series.

[0099] In another embodiment, the two tabs 21 are located on opposite sides of the bare battery core 2. With such a design, the two bare battery cores 2 can be connected in series.

[0100] In one embodiment, please refer to Figures 4 to 8 The battery cell 10 includes at least two adapter plates 3 disposed in the accommodating cavity 1a, and the two tabs 21 of the bare cell 2 are respectively the positive tab and the negative tab, and the positive tab and the negative tab of each bare cell 2 are respectively connected to the two adapter plates 3. In this way, the bare cells 2 are connected in parallel.

[0101] In one embodiment, the battery cell includes at least three adapter plates 3 all disposed in the accommodating cavity 1a, wherein the three adapter plates 3 are respectively the first adapter plate, the second adapter plate and the third adapter plate, the two tabs of the bare cell are respectively the positive tab and the negative tab, all the bare cells are divided into the first unit and the second unit, the positive tab of the first unit is connected to the first adapter plate, the negative tab of the second unit is connected to the second adapter plate, and the negative tab of the first unit and the positive tab of the second unit are both connected to the third adapter plate. In this way, the series connection between the bare cells 2 is realized.

[0102] It should be noted that the first adapter plate, the second adapter plate and the third adapter plate are all adapter plates 3, and are distinguished in name for the convenience of description.

[0103] In one embodiment, please refer to Figure 4 and Figure 8 , each bare cell 2 includes a tab 21 connected to the pole piece, two groups of bare cells 2 are arranged at intervals along the first direction to form a unit 100, and the tabs of the two groups of bare cells 2 in the unit 100 are arranged opposite to each other, wherein the first direction is perpendicular to the thickness direction. That is, the tab 21 is located on one side of the bare cell 2 along the first direction. In a unit 100, the tab 21 of one group of bare cells 2 faces the tab 21 of another group of bare cells 2.

[0104] In this embodiment, the tabs 21 are electrically connected to the poles 5 of the battery cell 10 through the adapter 3, thereby connecting the bare cell 2 to the external circuit. The tabs 21 of the two groups of bare cells 2 of the unit 100 are arranged opposite to each other, which facilitates the connection of the tabs 21 of the two groups of bare cells 2 of the unit 100 to the adapter 3, reducing the difficulty of wiring.

[0105] In one embodiment, please refer to Figure 4 and Figure 8 , at least two tabs 21 of a single bare cell 2 can be spaced apart along the second direction. In a single bare cell 2, at least one of the at least two tabs 21 is a positive tab 21, and at least one of the at least two tabs 21 is a negative tab 21. That is, at least two tabs 21 of a single bare cell 2 are staggered in the second direction, so that each tab 21 is connected to the adapter 3 respectively.

[0106] For some examples, see Figure 4 and Figure 8 The battery cell 10 may include one unit 100. That is, two groups of bare cells 2 are arranged in the battery cell 10.

[0107] In some other embodiments, the battery cell 10 may include at least two units 100. For example, two units 100 or three units 100, etc. That is, 4 groups or 6 groups of bare cells 2 are arranged in the battery cell 10, etc.

[0108] In one embodiment, please refer to Figures 4 to 8 , the battery cell 10 includes a transfer plate 3 arranged in the accommodating cavity 1a, the pole lug 21 is arranged along a plane perpendicular to the thickness direction, a portion of the transfer plate 3 is located on one side of the pole lug 21 along the thickness direction, and the pole lugs of the two groups of bare cells 2 of the unit 100 are connected to the transfer plate 3. Exemplarily, in some embodiments, the pole lug 21 is arranged in a horizontal direction, and a portion of the transfer plate 3 is located below the pole lug 21. The transfer plate 3 is used to realize the electrical connection between the pole lug 21 and the pole column 5. On the one hand, the pole lug 21 is arranged along a plane perpendicular to the thickness direction, and the thickness direction of the pole lug 21 is consistent with the thickness direction of the bare cell 2, so that the pole lug 21 does not need to be bent. On the other hand, a portion of the transfer plate 3 is located on one side of the pole lug 21 along the thickness direction, for example, a portion of the transfer plate 3 is located below the pole lug 21, and the transfer plate 3 can play a role in supporting the pole lug 21, and it is also convenient for the pole lug 21 and the transfer plate 3 to be connected over a larger area.

[0109] In some embodiments, the tab 21 and the adapter 3 are welded. Exemplarily, the tab 21 and the adapter 3 are welded by ultrasonic welding or laser welding. Part of the adapter 3 is located below the tab 21, and the tab 21 can be welded to the portion of the adapter 3 located below it, and the space above is open, which is convenient for the welding tool to perform welding operations.

[0110] In one embodiment, please refer to Figure 4 , Figure 5 and Figure 8 The battery includes a heat-insulating pad 4 disposed in the accommodating cavity 1a, and the combined structure formed by the tab 21 and the adapter 3 is close to the first side of the housing 1, and the heat-insulating pad 4 is located between the first side and the combined structure. The heat-insulating pad 4 can play two roles of heat insulation and insulation. In the process of welding the tab 21 and the adapter 3, the heat-insulating pad 4 can isolate the residual heat of welding between the adapter 3 and the tab 21.

[0111] Exemplarily, the thermal insulation pad 4 is located between the two groups of bare cells 2 of the unit 100, and the thermal insulation pad 4 is arranged on the side of the adapter 3 away from the tab 21 along the thickness direction. For example, the thermal insulation pad 4 is arranged below the adapter 3. The thermal insulation pad 4 can play two roles of heat insulation and insulation. In the process of welding the tab 21 and the adapter 3, the thermal insulation pad 4 can isolate the residual heat of welding between the adapter 3 and the tab 21.

[0112] The material of the thermal insulation pad 4 is not limited, and the material of the thermal insulation pad 4 includes but is not limited to polyimide.

[0113] In one embodiment, please refer to Figures 3 to 5 The battery includes a pole 5, and the pole 5 is arranged on the peripheral side of the shell 1. Compared with the pole 5 being arranged on the top surface or the bottom surface of the shell 1, such a design can prevent the pole 5 from interfering with the placement of the bare battery cell 2, and can also prevent external objects from pressing the pole 5 from the top and bottom directions.

[0114] It should be noted that the peripheral side surface of the housing 1 refers to a surface surrounding a straight line extending in the thickness direction.

[0115] In one embodiment, the pole 5 may also be disposed on the top surface of the housing 1 .

[0116] In some embodiments, the pole 5 and the adapter plate 3 can be riveted or welded. The pole 5 and the adapter plate 3 are riveted, which has a simpler process and convenient operation.

[0117] In one embodiment, please refer to Figures 3 to 5 The adapter sheet 3 includes a sheet body 31 and a vertical portion 32. The sheet body 31 is placed along a plane perpendicular to the thickness direction, and the sheet body 31 is located on one side of the pole lug 21 along the thickness direction, and the vertical portion 32 extends from the sheet body 31 to the side where the pole lug 21 is located. For example, the sheet body 31 is placed along the horizontal direction and is located below the pole lug 21, and the vertical portion 32 extends upward from the sheet body 31. The sheet body 31 is connected to the pole lug 21, and the vertical portion 32 is connected to the pole 5. The structure of the adapter sheet 3 is simple.

[0118] In one embodiment, please refer to Figures 3 to 5 The two poles 5 are respectively located on both sides of the housing 1 along the second direction or the first direction, wherein the first direction, the second direction and the thickness direction are perpendicular to each other. Of the two poles 5, one is a positive pole 5 and the other is a negative pole 5. The two poles 5 are respectively located on different sides of the housing 1, so that the two poles 5 are respectively electrically connected to the two adapters 3.

[0119] It should be understood that in the embodiments of the present application, when the battery cell 10 is placed horizontally, the thickness direction is consistent with the up and down direction. In some embodiments, the first direction may be the length direction of the outer shell 1, and the second direction is the width direction of the outer shell 1; in other embodiments, the first direction may be the width direction of the outer shell 1, and the second direction is the length direction of the outer shell 1.

[0120] In some embodiments, the shell 12 and the pole 5 can be preassembled. That is, the shell 12 and the pole 5 can be preassembled before the final assembly line, so that the shell 12 and the pole 5 are integrally supplied on the final assembly line of the battery production, thereby improving production efficiency.

[0121] For example, in one embodiment, please refer to Figure 4 and Figure 8The tabs 21 of the two groups of bare cells 2 of the unit 100 are arranged opposite to each other, and the tabs 21 of the two groups of bare cells 2 of the unit 100 can correspond to each other one by one. The poles 5 are arranged on the peripheral side of the housing 1, and the poles 5 and the adapters 3 are arranged to correspond to each other one by one. In other words, one pole 5 corresponds to one adapter 3. The adapter 3 is used to connect the tabs 21 of the two groups of bare cells 2 with the corresponding poles 5, so as to save structural parts and quickly realize electrical connection.

[0122] In a specific embodiment, please refer to Figure 4 and Figure 8 Each group of bare cells 2 includes a bare cell 2, and the two bare cells 2 are spaced apart along the first direction. For ease of description, the two poles 5 are defined as the first pole and the second pole, respectively, and the two adapters 3 are defined as the first adapter and the second adapter, respectively. The first pole and the second pole are located on both sides of the housing 1 along the second direction, respectively, the first adapter is connected to the first pole, the second adapter is connected to the second pole, the first adapter is connected to part of the pole ears 21 of the two bare cells 2, and the second adapter 3 is connected to the remaining pole ears 21 of the two bare cells 2. In this way, one of the first pole and the second pole is a positive pole, and the other of the first pole and the second pole is a negative pole.

[0123] In one embodiment, please refer to Figures 4 to 7 The battery includes an insulating frame 6 disposed in the accommodating cavity 1a, the insulating frame 6 is formed with at least two isolation cavities 6a, and the bare cells 2 of the same group are disposed in the isolation cavities 6a. The insulating frame 6 can provide insulation, and the bare cells 2 are insulated and isolated from the housing 1 by the insulating frame 6, thereby preventing the housing 1 from being charged to a certain extent.

[0124] In one embodiment, please refer to Figures 4 to 7 , the top side of the insulating frame 6 along the thickness direction is formed with an installation port, which is connected to the isolation cavity 6a, and the bare cells 2 of the same group enter and exit the isolation cavity 6a through the installation port. Exemplarily, each isolation cavity 6a can hold a group of bare cells 2. The insulating frame 6 can provide insulation, and the installation port facilitates the bare cells 2 to be placed into the isolation cavity 6a from top to bottom. The bottom surface of the isolation cavity 6a can support the bare cells 2 and provide insulation protection. The bare cells 2 are placed in the isolation cavity 6a, and the bare cells 2 are insulated and isolated from the outer shell 1 by the insulating frame 6, thereby preventing the outer shell 1 from being charged to a certain extent.

[0125] In one embodiment, please refer to Figures 4 to 7The insulating frame 6 includes a support frame 61 and two supporting frames 62. The two supporting frames 62 are arranged at intervals along the first direction. The supporting frames 62 are formed with installation ports and isolation chambers 6a. The two supporting frames 62 have avoidance ports 62a formed on opposite sides. At least part of the pole ear 21 of the bare battery cell 2 extends out of the avoidance ports 62a. The support frame 61 is supported between the two supporting frames 62. The avoidance ports 62a facilitate the extension of the pole ear 21 of the bare battery cell 2 to connect with the adapter 3. On the one hand, the supporting frame 62 plays the role of supporting and isolating the bare battery cell 2, so that the bare battery cell 2 is arranged at intervals along the first direction. On the other hand, the supporting frame 61 can support the two supporting frames 62, play the role of positioning and limiting the supporting frames 62, not only to prevent the two supporting frames 62 from moving, but also to prevent the bare battery cell 2 from escaping from the avoidance ports 62a, and play the role of limiting and fixing the bare battery cell 2.

[0126] In some embodiments, the supporting frame 62 may be connected to the circumferential surface of the accommodating cavity 1a. For example, the supporting frame 62 may be bonded to the circumferential surface of the accommodating cavity 1a by double-sided tape.

[0127] In one embodiment, the thermal insulation pad 4 can be connected to the insulating frame 6 by hot-melt connection to achieve fixation of the thermal insulation pad 4 .

[0128] In one embodiment, please refer to Figures 4 to 7 The supporting frame 62 includes a frame 621 and a support plate 622. The frame 621 surrounds the outer periphery of the bare cell 2. The support plate 622 is arranged at the bottom of the frame 621. The support plate 622 and the frame 621 jointly define a mounting opening, an escape opening 62a and an isolation cavity 6a. The top opening defined by the frame 621 is the mounting opening, the opening on one side along the first direction defined by the frame 621 is the escape opening 62a, and the space enclosed by the frame 621 and the support plate 622 is the isolation cavity 6a. The supporting frame 62 has a simple structure, is easy to manufacture, and can effectively isolate the bare cell 2 from the housing 1.

[0129] In one embodiment, the support frame 62 and the shell 12 can be pre-assembled. That is, the support frame 62 and the shell 12 can be pre-assembled before the final assembly line, so that the support frame 62 and the shell 12 are integrally supplied on the final assembly line, thereby eliminating the process of covering the bare battery cell 2 with the support frame 62 on the final assembly line, thereby improving production efficiency.

[0130] In one embodiment, please refer to Figures 4 to 7 The support frame 61 includes a support rod 611 and two baffles 612, the two baffles 612 are arranged at intervals along the first direction, the two baffles 612 are respectively connected to the two supporting frames 62, and the support rod 611 connects the two baffles 612. The baffle 612 blocks the avoidance opening 62a to stop the bare battery cell 2. The support rod 611 can strengthen the structural strength of the two baffles 612 and limit the deformation of the two baffles 612.

[0131] In some embodiments, the support rod 611 and the two baffles 612 may be an integrally formed structure, thereby saving assembly processes and improving production efficiency.

[0132] In some embodiments, the baffle 612 can be connected to the support frame 62 by heat melting.

[0133] In one embodiment, please refer to Figure 7 The number of the support rods 611 is at least two, and the at least two support rods 611 are arranged at intervals along the second direction. The at least two support rods 611 can provide more stable support and reduce the force on a single support rod 611.

[0134] In one embodiment, please refer to Figures 5 to 7 One of the supporting frame 62 and the supporting frame 61 is formed with a slot 601, and the other of the supporting frame 62 and the supporting frame 61 is formed with a protrusion 602, which is inserted into the slot 601. The protrusion 602 and the slot 601 are snap-fitted, so that the supporting frame 62 and the supporting frame 61 can be quickly positioned and assembled.

[0135] In one embodiment, please refer to Figures 5 to 7 The supporting frame 62 is formed with a slot 601, the end of the baffle 612 along the second direction is a protrusion 602, and the slot 601 opens along the second direction toward the baffle 612. During the assembly process, the end of the baffle 612 along the second direction is inserted into the slot 601, so that the support frame 61 and the supporting frame 62 can be quickly assembled.

[0136] Exemplarily, in one embodiment, the frame 621 includes a main frame and an end, the end is formed with a slot 601, and the end is connected to the main frame. The end and the main frame can be made of different materials. For example, the hardness of the end can be greater than the hardness of the main frame, so as to strengthen the structural strength of the end and improve the connection stability between the end and the support frame 61.

[0137] Exemplarily, the support frame 61 is made of at least one of polyethylene, polypropylene or polytetrafluoroethylene.

[0138] Exemplarily, the main frame and the support plate 622 may be made of at least one of polyethylene, polypropylene, polytetrafluoroethylene, and the like.

[0139] In one embodiment, an insulating film layer is provided on the top surface of the bare battery cell 2 along the thickness direction. For example, an insulating film layer is provided on the upper surface of the bare battery cell 2. The insulating film layer can prevent the top surface of the bare battery cell 2 from directly contacting the outer shell 1 so that the outer shell 1 is charged.

[0140] Exemplarily, the material of the insulating film layer includes but is not limited to polyethylene terephthalate.

[0141] In one embodiment, please refer to Fig. 9The battery pack includes a buffer pad 20, and a plurality of battery cells 10 are stacked to form a module 200. At least one buffer pad 20 is arranged between two adjacent battery cells 10 in the module 200. During the use of the battery pack, the battery cells 10 will continue to expand, and the buffer pad 20 can alleviate the expansion force generated during use, thereby playing a role in buffering and vibration isolation.

[0142] In one embodiment, please refer to Fig. 9 The battery pack includes a liquid cooling plate 301, which is located between the battery cell 10 and the bottom plate. Exemplarily, the module 200 is located above the liquid cooling plate 301. The liquid cooling plate 301 is used to perform heat exchange with the battery cell 10 to adjust the temperature of the battery cell 10. The liquid cooling plate 301 is located between the battery cell 10 and the bottom plate so as to contact with a larger area of ​​the battery cell 10, thereby improving the heat exchange efficiency.

[0143] Illustratively, the battery cell 10 is located above the liquid cooling plate 301 , so that the center of gravity of the battery pack is lowered, and the liquid cooling plate 301 can be prevented from interfering with the arrangement of structures such as the busbar in the battery pack.

[0144] The battery pack may further include a box 30, and the battery cell 10 may be placed in the box 30. In some embodiments, the liquid cooling plate 301 may serve as the bottom plate of the box 30. In other embodiments, the bottom plate is disposed on the bottom side of the liquid cooling plate 301. In other words, the box 30 has both the liquid cooling plate 301 and the bottom plate.

[0145] In one embodiment, please refer to Fig. 9 The box body 30 includes a top cover 302, four side plates 303 and a liquid cooling plate 301. The top cover 302 and the liquid cooling plate 301 are placed in the horizontal direction, and the four side plates 303 are placed in the vertical direction. The top cover 302, the liquid cooling plate 301 and the four side plates 303 together define a hollow hexahedral structure. In other words, the liquid cooling plate 301 can not only play the role of heat exchange with the battery cell 10, but also serve as a part of the box body 30 and play a supporting role.

[0146] In one embodiment, a fluid channel for circulating a refrigerant may be formed in the liquid cooling plate 301 , so that the refrigerant can flow in the fluid channel and perform heat exchange with the battery cells 10 .

[0147] Types of refrigerants include, but are not limited to, water.

[0148] In one embodiment, please refer to Figure 3 and Fig. 9The battery pack includes a battery cell 10 and a terminal block 40 in any one of the embodiments of the present application, and the battery cell 10 includes a pole 5, and the pole 5 is arranged on the peripheral side of the outer shell 1, wherein the thickness direction is perpendicular to the horizontal plane. The terminal block 40 is located on the side where the pole 5 of the battery cell 10 is located to connect with the pole 5. The terminal block 40 is connected to the pole 5 to facilitate the realization of an external circuit. The terminal block 40 is arranged on the peripheral side of the battery cell 10, which not only prevents the terminal block 40 from increasing the height dimension of the battery pack in the up and down direction, but also the distance between the terminal block 40 and the pole 5 is close, which can reduce the setting of electrical wiring such as cables and save costs.

[0149] In one embodiment, please refer to Figure 3 and Fig. 9 , two poles 5 are respectively located on both sides of the housing 1 along the second direction, and two terminal blocks 40 are respectively located on both sides of the battery cell 10 along the second direction. With such a design, the terminal blocks 40 correspond to the poles 5 one by one, so that the terminal blocks 40 can be connected to the poles 5 of multiple battery cells 10 of the module 200.

[0150] In one embodiment, please refer to Figure 3 and Fig. 9 , two poles 5 are respectively located on both sides of the housing 1 along the first direction, and two terminal blocks 40 are respectively located on both sides of the battery cell 10 along the first direction. With such a design, the terminal blocks 40 correspond to the poles 5 one by one, so that the terminal blocks 40 can be connected to the poles 5 of multiple battery cells 10 of the module 200.

[0151] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way.

Claims

1. A battery cell, characterized in that: include: A housing is formed with a receiving cavity; At least two groups of bare battery cells are arranged in the accommodating cavity, and each of the bare battery cells includes at least two layers of pole pieces. The at least two layers of pole pieces are stacked along the thickness direction. The bare battery cells in the same group are stacked along the thickness direction, and the bare battery cells in different groups are spread along a plane perpendicular to the thickness direction.

2. The battery cell according to claim 1, characterized in that: The total thickness of each group of bare cells in the thickness direction is 30 mm to 80 mm.

3. The battery cell according to claim 1, characterized in that: The thickness dimension of a single bare cell is 8 mm to 20 mm.

4. The battery cell according to claim 1, characterized in that: The number of bare cells in each group is 1 to 4.

5. The battery cell according to claim 1, characterized in that: Each of the bare battery cells includes at least two pole ears connected to the pole piece, and the two pole ears are located on the same side of the bare battery cell or on two opposite sides of the bare battery cell.

6. The battery cell according to claim 5, characterized in that: The battery cell comprises at least two adapter plates arranged in the accommodating cavity, the two tabs of the bare cell are respectively a positive tab and a negative tab, and the positive tab and the negative tab of each bare cell are respectively connected to the two adapter plates.

7. The battery cell according to claim 5, characterized in that: The battery cell includes at least three adapter plates all arranged in the accommodating cavity, wherein the three adapter plates are respectively a first adapter plate, a second adapter plate and a third adapter plate, the two pole tabs of the bare battery cell are respectively a positive pole tab and a negative pole tab, all the bare battery cells are divided into a first unit and a second unit, the positive pole tab of the first unit is connected to the first adapter plate, the negative pole tab of the second unit is connected to the second adapter plate, and the negative pole tab of the first unit and the positive pole tab of the second unit are both connected to the third adapter plate.

8. The battery cell according to claim 6 or 7, characterized in that: The battery cell includes a heat insulating pad disposed in the accommodating cavity, a combined structure formed by the tab and the adapter is close to a first side of the housing, and the heat insulating pad is located between the first side and the combined structure.

9. The battery cell according to claim 1, characterized in that: The battery cell comprises an insulating frame arranged in the accommodating cavity, wherein the insulating frame is formed with at least two isolation cavities, and the bare cells in the same group are arranged in the isolation cavities.

10. The battery cell according to claim 9, characterized in that: The insulating frame includes a support frame and two supporting frames, the two supporting frames are arranged at intervals along the first direction, the supporting frame forms the isolation cavity, and the opposite sides of the two supporting frames are formed with avoidance openings, at least part of the pole ear of the bare battery cell extends out of the avoidance opening, and the support frame is supported between the two supporting frames.

11. The battery cell according to claim 10, characterized in that: The support frame includes a support rod and two baffles, the two baffles are arranged at intervals along a first direction, the two baffles are respectively connected to the two supporting frames, and the support rod connects the two baffles.

12. The battery cell according to claim 10, characterized in that: One of the supporting frame and the supporting frame is formed with a slot, and the other of the supporting frame and the supporting frame is formed with a protrusion, and the protrusion is inserted into the slot.

13. The battery cell according to claim 1, characterized in that: An insulating film layer is provided on the top surface of the bare battery cell along the thickness direction.

14. The battery cell according to claim 1, characterized in that: The battery cell includes a pole, and the pole is arranged on the peripheral side of the shell.

15. The battery cell according to claim 14, characterized in that: The two poles are respectively located on both sides of the housing along the second direction or the first direction, wherein the first direction, the second direction and the thickness direction are perpendicular to each other.

16. A battery pack, characterized in that: The battery cell and the box body comprise any one of claims 1 to 15, wherein the box body comprises a bottom plate and a top cover, and the angle between the thickness direction of the bare battery cell and the plane where the bottom plate is located is 80 to 90 degrees.

17. The battery pack according to claim 16, characterized in that: The battery pack includes a buffer pad, a plurality of the battery cells are stacked to form a module, and at least one buffer pad is arranged between two adjacent battery cells in the module.

18. The battery pack according to claim 16, characterized in that: The battery pack includes a liquid cooling plate located between the battery cells and the bottom plate.

19. An electrical device, characterized in that: A battery pack comprising any one of claims 16 to 18.

20. An energy storage device, characterized in that: A battery pack comprising any one of claims 16 to 18.

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