Battery pack, electrical apparatus, and energy storage apparatus

Abstract

A battery pack, an electrical apparatus, and an energy storage apparatus, belonging to the technical field of batteries. The battery pack comprises a box body (2) and battery cells (1). At least two battery cells (1) are mounted in the box body (2). Each battery cell (1) is provided with a recessed region (14). Each battery cell (1) comprises a case (11), a bare cell (12), and a post (13), the bare cell (12) is mounted in the case (11), the post (13) is mounted on the case (11), and the post (13) is electrically connected to the bare cell (12). At least one post (13) is a first post (131) protruding out of the outer side of the case (11), and the at least one post (13) is a second post (132). In two adjacent battery cells (1) electrically connected to one another, the first post (131) of one of the battery cells (1) is located in the recessed region (14) of the other battery cell (1) so as to be electrically connected to the corresponding second post (132). The protruding first post (131) is located in the recessed region (14) and is connected to the second post (132), reducing the space in the battery pack occupied by gaps in which the posts (13) are arranged, thereby improving the volume utilization rate of the battery pack. By means of the cooperation of the protruding first posts (131) and the recessed regions (14), the battery cells (1) are docked as a group, thus the overall rigidity of the battery pack can be enhanced.

Description

Battery pack, electric device and energy storage device

[0001] Cross-reference to related applications

[0002] The present application is based on and claims priority to Chinese Patent Application No. 202420777965.0, filed on April 15, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of batteries, in particular to a battery pack, an electric device and an energy storage device. BACKGROUND

[0004] New energy batteries are increasingly widely used in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also increasingly used in the field of energy storage and the like.

[0005] In related technologies, the volumetric energy density of a battery pack is low.

[0006] SUMMARY

[0007] To solve the above technical problems, the present application provides a battery pack, an electric device and an energy storage device to improve the volumetric utilization of the battery pack.

[0008] The embodiments of the present application are implemented by the following technical solutions.

[0009] The first aspect of the embodiments of the present application provides a battery pack, comprising:

[0010] a box body;

[0011] a plurality of battery monomers installed in the box body, the number of the battery monomers being at least two, the battery monomers having a recessed area, the battery monomers comprising a shell, a bare cell and a pole, the bare cell being installed in the shell, the pole being installed on the shell, the pole being electrically connected with the bare cell, at least one of the poles being a first pole protruding out of the shell, at least one of the poles being a second pole, the first pole of one of the battery monomers being located in the recessed area of the other battery monomer to be electrically connected with the corresponding second pole.

[0012] In the scheme of the embodiments of the present application, the protruding first pole is connected with the second pole in the recessed area, which improves the volumetric utilization of the battery pack. By matching the protruding first pole and the recessed area, the overall rigidity of the battery pack can be enhanced.

[0013] In an embodiment, the shell wall of the housing for mounting the first pole is a first shell wall, the first pole protrudes outward from the first shell wall, an end face of an end of the first pole away from the bare battery cell is a first end face, a distance between the first end face and the first shell wall is a first distance, the recessed area has a first notch, the first pole extends to the corresponding recessed area through the first notch, a direction corresponding to the first pole through the first notch is a first direction, a depth of the recessed area along the first direction is a second distance, the first distance is greater than or equal to 1 mm, the first distance is less than or equal to 20 mm, the second distance is greater than or equal to 1 mm, and the second distance is less than or equal to 20 mm.

[0014] In the embodiments of the present application, the first distance and the second distance are within a suitable range, which is beneficial to improve the volume utilization rate of the battery monomer.

[0015] In an embodiment, the first distance is greater than or equal to 1 mm, the first distance is less than or equal to 10 mm, the second distance is greater than or equal to 1 mm, and the second distance is less than or equal to 10 mm.

[0016] In the embodiments of the present application, the first distance and the second distance are within a suitable range, which is beneficial to improve the volume utilization rate of the battery monomer.

[0017] In an embodiment, a span of the housing along the first direction is a third distance, a ratio of the first distance to the third distance is a target ratio, the target ratio is greater than or equal to 0.0004, the target ratio is less than or equal to 0.4, the third distance is greater than or equal to 10 mm, and the third distance is less than or equal to 2500 mm.

[0018] In the embodiments of the present application, the ratio of the first distance to the span of the battery monomer along the first direction is within a suitable range, which can improve the volume utilization rate of the battery monomer under the condition of normal butt joint of the first pole and the second pole and meeting the required space for connection.

[0019] In an embodiment, the third distance is greater than or equal to 10 mm, and the third distance is less than or equal to 500 mm.

[0020] In the embodiments of the present application, the third distance is within a suitable range, which is beneficial to meet the connection strength of the first pole and the second pole.

[0021] In an embodiment, a minimum thickness of the annular outer frame of the box body is a target thickness, a ratio of the first distance to the target thickness is a second ratio, the second ratio is greater than or equal to 0.005, and the second ratio is less than or equal to 20.

[0022] In the embodiments of the present application, the ratio of the first distance of the battery monomer to the thickness of the outer frame of the box is within a proper range, which can meet the condition of the structural strength of the battery pack and improve the space utilization of the battery pack.

[0023] In an embodiment, the battery monomer includes an explosion-proof valve mounted on the shell, the shell wall of the shell for mounting the explosion-proof valve is a second shell wall, and the pole is mounted on the shell wall other than the second shell wall.

[0024] In the embodiments of the present application, the thermal runaway substance discharged by the explosion-proof valve avoids the position of the pole, prevents the thermal runaway substance from causing short circuit of the pole, and improves the safety of the battery monomer.

[0025] In an embodiment, the second shell wall is located on the upper side of the shell, or the second shell wall is located on the lower side of the shell, or the second shell wall is located on one side of the shell along a second direction, and the second direction is perpendicular to the direction in which the first pole penetrates the first gap and the up-down direction.

[0026] In the embodiments of the present application, the explosion-proof valve faces upward, and the bottom of the battery pack has good impact resistance. The explosion-proof valve faces downward, the explosion-proof valve discharges the thermal runaway substance downward, does not affect the structure above the battery pack, and has good safety. The explosion-proof valve faces one side along the second direction, the bottom of the battery pack has good impact resistance, and the battery monomer is also convenient to stack along the up-down direction.

[0027] In an embodiment, the recessed area is formed on the surface of the second pole, and the first pole of one battery monomer is connected to the recessed area formed by the second pole of another battery monomer.

[0028] In the embodiments of the present application, the connection position of the first pole and the second pole is limited, which can reduce the precision requirement of the butt joint of the second pole and the first pole, and is convenient for the butt joint of the battery monomer.

[0029] In an embodiment, the recessed area is formed on the shell, and the second pole is located in the recessed area, and the first pole of one battery monomer is electrically connected to the second pole in the recessed area of another battery monomer.

[0030] In the embodiments of the present application, the shape of the second pole is not limited, which is convenient for processing the second pole.

[0031] In an embodiment, the first pole has a first insertion part and a first insertion slot, the first insertion slot is located on a side of the first insertion part facing the corresponding shell, the second pole has a second insertion part and a second insertion slot, the second insertion slot is located on a side of the second insertion part facing the corresponding shell, the first insertion part of the first pole is located in the second insertion slot of the corresponding electrically connected second pole, and the second insertion part of the second pole is located in the first insertion slot of the corresponding electrically connected first pole.

[0032] In the embodiments of the present application, the first pole and the corresponding second pole are inserted into each other, the contact area of the electrical connection between the battery monomers is increased, and the overcurrent capacity between the battery monomers is improved.

[0033] In an embodiment, the first pole further has a buffer slot, and the buffer slot is located on a side of the first insertion slot away from the first insertion part.

[0034] In the embodiments of the present application, the buffer slot leaves space for the expansion and movement of the battery monomer, and the buffer slot also enables the first pole to deform to a certain extent, thereby facilitating the installation of the first pole and the second pole.

[0035] In an embodiment, the buffer slot penetrates the first pole upward, and the first insertion slot penetrates the first pole downward, and the buffer slot and the first insertion slot both penetrate opposite sides of the first pole in the second direction perpendicular to the upward and downward directions and the direction in which the first pole penetrates the corresponding first gap.

[0036] In the embodiments of the present application, the buffer slot penetrates the first pole upward and in the second direction, which is conducive to the deformation of the buffer slot in the first direction, and the buffer effect is good. The first insertion slot penetrates the first pole downward and in the second direction, which does not limit the connection direction of the corresponding second pole, and facilitates the connection with the corresponding second pole.

[0037] In an embodiment, the battery monomer includes a connecting piece, and in two adjacent battery monomers electrically connected to each other, the connecting piece connects the first pole of one of the battery monomers and the second pole of the other battery monomer, respectively.

[0038] In the embodiments of the present application, the first pole and the corresponding electrically connected second pole are connected through the connecting piece, the connection between the first pole and the corresponding second pole is stable, and it is also convenient to take electricity sampling from the connecting piece.

[0039] In an embodiment, in the upward and downward direction projection, the projection area of the first pole and the projection area of the corresponding electrically connected second pole at least partially overlap.

[0040] In the embodiments of the present application, the first pole and the second pole have a large contact area, a low contact surface resistance, and a large overcurrent area, thereby improving the overcurrent capacity of the battery monomer.

[0041] In an embodiment, one of the walls of the recessed area is a target surface, the target surface is arranged opposite to the first notch, and the bare battery cell is arranged on opposite sides of the target surface in a direction corresponding to the first pole penetrating the first notch.

[0042] In an embodiment, the bare battery cell is arranged on opposite sides of the target surface in a direction corresponding to the first pole penetrating the first notch, which can increase the volume of the bare battery cell and improve the utilization rate of the internal volume of the battery monomer.

[0043] In an embodiment, one of the walls of the recessed area is a target surface, the target surface is arranged opposite to the first notch, and the bare battery cell is arranged on opposite sides of the target surface in a direction corresponding to the first pole penetrating the first notch.

[0044] In an embodiment, the bare battery cell is arranged on opposite sides of the target surface in a direction corresponding to the first pole penetrating the first notch, which can increase the volume of the bare battery cell and improve the utilization rate of the internal volume of the battery monomer.

[0045] In an embodiment, the recessed area has a second notch, and the opening direction of the second notch is upward.

[0046] In an embodiment, the second notch is upward, which facilitates the connection of the first pole and the second pole and facilitates the assembly of adjacent battery monomers.

[0047] In an embodiment, the side wall of the recessed area surrounds the first notch, and the shape of the side wall of the recessed area is a closed ring.

[0048] In an embodiment, the first pole is fixed in the recessed area, which is beneficial to prevent the first pole from being pulled out of the recessed area in the upward direction or the second direction.

[0049] In an embodiment, the first pole and the second pole are respectively arranged on opposite sides of the shell.

[0050] In an embodiment, the first pole and the second pole are respectively arranged on opposite sides of the shell.

[0051] In an embodiment, the battery pack includes a spacer, and the spacer is arranged between adjacent battery monomers.

[0052] In the embodiments of the present application, extrusion and vibration may occur between adjacent battery monomers, and the spacer can play a buffering role.

[0053] In an embodiment, the shape of the first pole is matched with the shape of the recessed area.

[0054] In the embodiments of the present application, the space utilization rate of the recessed area is improved, thereby improving the internal space utilization rate of the battery monomer.

[0055] In an embodiment, the shell comprises a main body and at least one cover plate provided on the main body, and the first pole and / or the second pole are installed on the cover plate.

[0056] In the embodiments of the present application, the pole can be installed on the cover plate, which facilitates the processing of the battery monomer.

[0057] In an embodiment, the shell is square.

[0058] In the embodiments of the present application, the square shell makes the contact area between adjacent battery monomers large, and the space utilization rate of the battery pack is high.

[0059] The second aspect of the embodiments of the present application provides a power utilization device, comprising:

[0060] a main body;

[0061] any of the above battery packs for supplying power to the main body.

[0062] The third aspect of the embodiments of the present application provides a power storage device, comprising:

[0063] an outer box;

[0064] any of the above battery packs installed in the outer box. Advantages

[0065] The battery pack of the embodiments of the present application is provided. The protruding first pole is located in the recessed area and connected with the second pole, which reduces the space occupied by the gap of the arranged pole and improves the volume utilization rate of the battery pack. The first pole of the battery monomer is located in the recessed area of another battery monomer and connected with the corresponding second pole. Through the cooperation of the protruding first pole and the recessed area, the battery monomers are connected in groups, which can enhance the overall rigidity of the battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0066] FIG. 1 is a structural schematic diagram of a battery pack according to an embodiment of the present application;

[0067] FIG. 2 is an exploded view of the battery pack according to an embodiment of the present application;

[0068] FIG. 3 is a structural schematic diagram of a battery monomer of the battery pack according to an embodiment of the present application, which shows the second pole and the cover plate.

[0069] FIG. 4 is a schematic view of a battery cell structure of the battery pack according to an embodiment of the present application, showing a first pole and a cover plate;

[0070] FIG. 5 is an assembly view of a battery cell and a case of the battery pack according to an embodiment of the present application, not showing a relief valve;

[0071] FIG. 6 is an assembly view of a battery cell and a case of the battery pack according to an embodiment of the present application, showing a relief valve facing a second direction;

[0072] FIG. 7 is an assembly view of a battery cell and a case of the battery pack according to an embodiment of the present application, showing a relief valve facing upward;

[0073] FIG. 8 is a schematic view of a battery cell structure of the battery pack according to an embodiment of the present application, showing that, in a second direction perpendicular to both an up-down direction and a direction in which a first pole penetrates a first notch, a second pole is located on one side of a housing, and a recessed area is formed in the housing;

[0074] FIG. 9 is a schematic view of a battery cell structure of the battery pack according to an embodiment of the present application, showing that, in a second direction perpendicular to both an up-down direction and a direction in which a first pole penetrates a first notch, the first pole is located on the other side of the housing;

[0075] FIG. 10 is an enlarged view of a portion of FIG. 8;

[0076] FIG. 11 is an enlarged view of a portion of FIG. 9;

[0077] FIG. 12 is an assembly view of a battery cell of the battery pack according to an embodiment of the present application, showing that, in a second direction perpendicular to both an up-down direction and a direction in which a first pole penetrates a first notch, the first pole and the second pole are arranged in a spaced-apart manner, and a connecting member is connected to the first pole and the second pole;

[0078] FIG. 13 is a cross-sectional view of FIG. 12 taken along line j-j;

[0079] FIG. 14 is a cross-sectional view of FIG. 12 taken along line k-k;

[0080] FIG. 15 is an enlarged view of a portion of FIG. 14;

[0081] FIG. 16 is a schematic view of a battery cell structure of the battery pack according to an embodiment of the present application, showing that, in a second direction perpendicular to both an up-down direction and a direction in which a first pole penetrates a first notch, a second pole extends from one side of a housing to the other side;

[0082] FIG. 17 is a schematic view of a battery cell structure of the battery pack according to an embodiment of the present application, showing that, in a second direction perpendicular to both an up-down direction and a direction in which a first pole penetrates a first notch, the first pole extends from one side of a housing to the other side.

[0083] Fig. 18 is an enlarged view of d in Fig. 16;

[0084] Fig. 19 is an enlarged view of e in Fig. 17;

[0085] Fig. 20 is an assembly view of a battery cell of the battery pack according to an embodiment of the present application, in which a first pole post and a corresponding second pole post are arranged in a stack;

[0086] Fig. 21 is a sectional view taken along m-m in Fig. 20;

[0087] Fig. 22 is an enlarged view of f in Fig. 21;

[0088] Fig. 23 is a structural schematic view of a battery cell of the battery pack according to an embodiment of the present application, in which an end of a housing facing a second pole post is shown, the second pole post having a second insertion slot;

[0089] Fig. 24 is a structural schematic view of a battery cell of the battery pack according to an embodiment of the present application, in which an end of a housing facing a first pole post is shown, the first pole post having a buffer slot;

[0090] Fig. 25 is an enlarged view of g in Fig. 23;

[0091] Fig. 26 is an enlarged view of h in Fig. 24;

[0092] Fig. 27 is an assembly view of a battery cell of the battery pack according to an embodiment of the present application, in which a second pole post having a second insertion slot and a first pole post having a buffer slot are engaged with each other;

[0093] Fig. 28 is a sectional view taken along n-n in Fig. 27;

[0094] Fig. 29 is an enlarged view of i in Fig. 28;

[0095] Fig. 30 is a structural schematic view of a battery cell according to an embodiment of the present application, in which a bare cell is arranged across opposite sides of a target surface;

[0096] Fig. 31 is a structural schematic view of a battery cell according to an embodiment of the present application, in which a bare cell is arranged on one side of a target surface;

[0097] Fig. 32 is a structural schematic view of a battery cell according to an embodiment of the present application, in which a recessed area is formed in a pole post.

[0098] BRIEF DESCRIPTION OF DRAWINGS

[0099] 1, battery monomer; 11, shell; 111, first shell wall; 112, second shell wall; 113, third shell wall; 114, main body; 115, cover plate; 12, bare cell; 13, pole; 131, first pole; 1311, first plug-in part; 1312, first plug-in slot; 1313, buffer slot; 1314, first end face; 132, second pole; 1321, second plug-in part; 1322, second plug-in slot; 14, recessed area; 141, first notch; 142, second notch; 143, target surface; 15, explosion-proof valve; 16, connecting piece; 17, spacer; 2, box; D1, first distance; D2, second distance; D3, third distance; D4, target thickness. DETAILED DESCRIPTION

[0100] The embodiments of the technical scheme of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0101] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the embodiments of the present application are intended to cover non-exclusive inclusion.

[0102] In the description of the embodiments of the present application, the technical terms "first", "second", "third" and the like 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. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly and specifically limited.

[0103] In this paper, "embodiment" means that the specific features, structures or properties described in conjunction with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment to other embodiments. The skilled person in the art explicitly and implicitly understands that the embodiments described herein can be combined with other embodiments.

[0104] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents the "or" relationship between the front and rear associated objects.

[0105] In the description of the embodiments of the present application, unless explicitly defined and limited otherwise, the technical terms "install", "connect", "connect", "fix", and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0106] In the description of the embodiments of the present application, unless explicitly defined and limited otherwise, the technical term "contact" should be understood broadly, which can be direct contact or contact through an intermediate medium layer, which can be contact between two objects in contact without interaction force, or contact between two objects in contact with interaction force.

[0107] In the related art, the battery pack is usually composed of at least two battery monomers 1 in series or parallel connection, the adjacent battery monomers 1 are connected through the pole 13, the pole 13 protrudes from the surface of the shell 11 of the battery monomer 1, and a gap for arranging the pole 13 is required between the adjacent two battery monomers 1, the gap for arranging the pole 13 occupies the internal space of the battery pack, and the volume utilization rate of the battery pack is low.

[0108] The battery pack of the embodiments of the present application improves the volume utilization rate of the battery pack by locating the first pole 131 of one of the battery monomers 1 in the recessed area 14 of the other battery monomer 1 to be electrically connected with the corresponding second pole 132.

[0109] The battery pack of the embodiments of the present application can be applied to an electric device and an energy storage device.

[0110] The electric device is a device that uses electric energy as energy and realizes corresponding functions by consuming electric energy. Exemplarily, the electric device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric plane toys, etc., and the spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0111] The electric device of the embodiments of the present application can include a main body 114 and a battery pack of any embodiment, and the battery pack supplies power to the main body 114.

[0112] The main body 114 refers to a structure of the main body 114 that consumes electric energy to realize corresponding functions. For example, the electric device can be a mobile phone, and the main body 114 is a part that can realize communication functions, and the part that can realize communication functions is powered by the battery pack. For example, the electric device can be a car, and the main body 114 is a part that can be used by people to ride and can drive on the road, and the part that can be used by people to ride and can drive on the road is powered by the battery pack.

[0113] An electric device in an embodiment of the present application is taken as a vehicle for example.

[0114] The vehicle provided by an embodiment of the present application can be a fuel car, a gas car, or a new energy car, and the new energy car can be a pure electric car, a hybrid car, or a range extended car. The vehicle is internally provided with a battery pack, which can be arranged at the bottom, head, or tail of the vehicle. The battery pack can be used for power supply of the vehicle, for example, the battery pack can be used as an operating power source of the vehicle. The vehicle can further include a controller and a motor, and the controller can be used to control the battery pack to supply power to the motor. For example, the battery pack can be used for the working power demand of the vehicle during starting, navigation, and driving.

[0115] In some embodiments of the present application, the battery pack can not only be used as an operating power source of the vehicle, but also be used as a driving power source of the vehicle, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle.

[0116] The embodiment of the present application further provides an energy storage device, which includes an outer box and the battery pack of any embodiment, and the battery pack is installed in the outer box.

[0117] The outer box is a container for containing objects, and most of the parts of the energy storage device are arranged in the outer box.

[0118] The energy storage box is a device that can store electric energy into the battery pack.

[0119] The battery pack of the embodiment of the application comprises a box body 2 and battery monomers 1, the battery monomers 1 are installed in the box body 2, the number of the battery monomers 1 is at least two, the battery monomers 1 have recessed areas 14, the battery monomers 1 comprise a shell 11, bare cells 12 and poles 13, the bare cells 12 are installed in the shell 11, the poles 13 are installed on the shell 11, the poles 13 are electrically connected with the bare cells 12, at least one of the poles 13 is a first pole 131 protruding from the outer side of the shell 11, at least one of the poles 13 is a second pole 132, the first pole 131 of one of the two adjacent battery monomers 1 electrically connected with each other is located in the recessed area 14 of the other battery monomer 1 to be electrically connected with the corresponding second pole 132, the recessed area 14 has a first notch 141, the first pole 131 penetrates the corresponding first notch 141 to extend to the corresponding recessed area 14, and the direction in which the corresponding first pole 131 penetrates the first notch 141 is a first direction.

[0120] The number of the battery monomers 1 is at least two, the at least two battery monomers 1 can be connected in series, in parallel or in a mixed manner, the mixed manner means that the at least two battery monomers 1 are connected in series and in parallel. The at least two battery monomers 1 can be directly connected in series, in parallel or in a mixed manner, and then the whole of the plurality of battery monomers 1 is placed in the box body 2. The battery pack can further comprise other structures, for example, the battery pack can further comprise a current collecting component for realizing electrical connection between the at least two battery monomers 1.

[0121] The battery monomer 1 refers to a basic unit capable of realizing mutual conversion between chemical energy and electrical energy.

[0122] The battery monomer 1 can be a secondary battery, which means that the battery monomer 1 can be activated by charging after being discharged to continue to be used.

[0123] The battery monomer 1 can be a lithium ion battery, a sodium ion battery, a sodium-lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery and the like, and the embodiment of the application is not limited in this regard.

[0124] Exemplarily, the bare cell 12 can be a laminated cell or a square winding cell.

[0125] Exemplarily, one end of the pole 13 can be connected with a busbar, and the other end can be connected with an external conductor, or the other end can be connected with a component connected with a pole of an adjacent battery monomer 1.

[0126] For the convenience of description, a first direction and a second direction are set, the first direction, the second direction and the up-down direction are directions intersecting with each other, the first direction intersects with the second direction, the first direction intersects with the up-down direction, and the second direction intersects with the up-down direction. For the convenience of description, as shown by arrows in FIG. 2 and FIG. 3, the direction of the arrow X is the first direction, the direction of the arrow Y is the second direction, and the direction of the arrow Z is the up-down direction.

[0127] Exemplarily, the intersecting includes perpendicular intersecting, the first direction and the second direction are perpendicular to each other, the first direction and the up-down direction are perpendicular to each other, and the second direction and the up-down direction are perpendicular to each other.

[0128] The box 2 refers to a structure having a containing space, the battery cell 1 is located in the box 2, and the battery cell 1 is contained by the box 2 to form a certain protection for the battery cell 1 and reduce the risk of the battery cell 1 being damaged by being exposed to the outside.

[0129] Exemplarily, the material of the box 2 can be a metal material.

[0130] Exemplarily, the material of the box 2 can be a plastic material.

[0131] Exemplarily, the box 2 can be sealed.

[0132] The battery pack of the embodiment of the application, the protruding first pole 131 is located in the recessed area 14 and connected with the second pole 132, the corresponding first pole 131 is contained by the recessed area 14 of the adjacent battery cell 1, the space of the battery pack occupied by the gap for arranging the corresponding first pole 131 between the adjacent battery cells 1 is reduced, and the volume utilization rate of the battery pack is improved. The first pole 131 of the battery cell 1 is located in the recessed area 14 of another battery cell 1 and connected with the corresponding second pole 132, the cooperation of the protruding first pole 131 and the recessed area 14 enables the battery cells 1 to be connected in groups, and the overall rigidity of the battery pack can be enhanced.

[0133] In an embodiment, the shell wall of the shell 11 for mounting the first pole 131 is a first shell wall 111, the first pole 131 protrudes outward from the first shell wall 111, the end face of one end of the first pole 131 away from the bare cell 12 is a first end face 1314, the distance between the first end face 1314 and the first shell wall 111 is a first distance D1, the recessed area 14 has a first notch 141, the first pole 131 penetrates the corresponding first notch 141 to extend to the corresponding recessed area 14, the direction in which the corresponding first pole 131 penetrates the first notch 141 is a first direction, the depth of the recessed area 14 along the first direction is a second distance D2, the first distance D1 is greater than or equal to 1 mm, the first distance D1 is less than or equal to 20 mm, the second distance D2 is greater than or equal to 1 mm, and the second distance D2 is less than or equal to 20 mm.

[0134] It can be understood that the first distance D1 can be measured by a vernier caliper or a ruler in a non-working state of the battery monomer 1 being powered off under normal temperature and pressure.

[0135] It can be understood that the second distance D2 can be measured by a vernier caliper or a ruler in a non-working state of the battery monomer 1 being powered off under normal temperature and pressure.

[0136] Exemplarily, the first distance D1 is 1 mm, 5 mm, 9 mm, 16 mm or 20 mm.

[0137] Exemplarily, the second distance D2 is 1 mm, 4 mm, 9 mm, 13 mm or 20 mm.

[0138] It should be explained that the unit “mm” is millimeter.

[0139] In the embodiment of the application, the first distance D1 and the second distance D2 are within a suitable range, which meets the condition of the space required for connecting the first pole 131 and the corresponding second pole 132, and is beneficial to improve the volume utilization rate of the battery monomer 1.

[0140] It can be understood that the first distance D1 is not limited in size, and the second distance D2 is not limited in size. In an embodiment, the first distance D1 is 25 mm, and the second distance D2 is 25 mm.

[0141] In an embodiment, the first distance D1 is greater than or equal to 1 mm, the first distance D1 is less than or equal to 10 mm, the second distance D2 is greater than or equal to 1 mm, and the second distance D2 is less than or equal to 10 mm.

[0142] Exemplarily, the first distance D1 is 1 mm, 3 mm, 8 mm or 10 mm.

[0143] Exemplarily, the second distance D2 is 1 mm, 3 mm, 7 mm or 10 mm.

[0144] It should be explained that the unit “mm” is millimeter.

[0145] In the embodiment of the application, the first distance D1 and the second distance D2 are within a suitable range, which meets the condition of the space required for connecting the first pole 131 and the corresponding second pole 132, and is beneficial to improve the volume utilization rate of the battery monomer 1.

[0146] In an embodiment, the span of the shell 11 along the first direction is a third distance D3, the ratio of the first distance D1 to the corresponding third distance D3 is a target ratio, the target ratio is greater than or equal to 0.0004, the target ratio is less than or equal to 0.4, the third distance D3 is greater than or equal to 10 mm, and the third distance D3 is less than or equal to 2500 mm.

[0147] It can be understood that the third distance D3 can be measured by a vernier caliper or a ruler in a non-working state of the battery monomer 1 being powered off, under normal temperature and pressure.

[0148] Exemplarily, the target ratio is 0.0004, 0.001, 0.06, 0.15, 0.3, or 0.4.

[0149] Exemplarily, the third distance D3 is 10 mm, 300 mm, 500 mm, 1000 mm, 2000 mm, or 2500 mm.

[0150] Exemplarily, the target ratio is 0.0004, the first distance D1 is 1 mm, and the third distance D3 is 2500 mm.

[0151] Exemplarily, the target ratio is 0.001, the first distance D1 is 1 mm, and the third distance D3 is 1000 mm.

[0152] Exemplarily, the target ratio is 0.02, the first distance D1 is 1 mm, and the third distance D3 is 50 mm.

[0153] Exemplarily, the target ratio is 0.004, the first distance D1 is 10 mm, and the third distance D3 is 2500 mm.

[0154] Exemplarily, the target ratio is 0.01, the first distance D1 is 10 mm, and the third distance D3 is 1000 mm.

[0155] Exemplarily, the target ratio is 0.2, the first distance D1 is 10 mm, and the third distance D3 is 50 mm.

[0156] Exemplarily, the target ratio is 0.008, the first distance D1 is 20 mm, and the third distance D3 is 2500 mm.

[0157] Exemplarily, the target ratio is 0.02, the first distance D1 is 20 mm, and the third distance D3 is 1000 mm.

[0158] Exemplarily, the target ratio is 0.4, the first distance D1 is 20 mm, and the third distance D3 is 50 mm.

[0159] It needs to be explained that the unit “mm” is millimeter.

[0160] In the embodiments of the present application, the first distance D1 determines the connection space of the first pole 131 and the corresponding second pole 132. The first pole 131 and the corresponding second pole 132 need to meet a certain connection strength to be normally connected. The ratio of the first distance D1 to the span of the battery monomer 1 in the first direction is within a suitable range, which can take into account the normal connection of the first pole 131 and the second pole 132 and meet the required space for connection, and improve the volume utilization rate of the battery monomer 1.

[0161] It can be understood that the target ratio value is not limited.

[0162] Exemplarily, the target ratio value is 0.00016, the first distance D1 is 0.4 mm, and the third distance D3 is 2500 mm.

[0163] Exemplarily, the target ratio value is 0.00024, the first distance D1 is 0.6 mm, and the third distance D3 is 2500 mm.

[0164] Exemplarily, the target ratio value is 0.00032, the first distance D1 is 0.8 mm, and the third distance D3 is 2500 mm.

[0165] Exemplarily, the target ratio value is 0.5, the first distance D1 is 25 mm, and the third distance D3 is 50 mm.

[0166] Exemplarily, the target ratio value is 0.6, the first distance D1 is 30 mm, and the third distance D3 is 50 mm.

[0167] Exemplarily, the target ratio value is 0.7, the first distance D1 is 35 mm, and the third distance D3 is 50 mm.

[0168] In an embodiment, the third distance D3 is greater than or equal to 10 mm, and the third distance D3 is less than or equal to 500 mm.

[0169] In the embodiments of the present application, the span of the battery monomer 1 in the first direction is within a suitable range, which is beneficial to meet the connection strength of the first pole 131 and the corresponding second pole 132.

[0170] In an embodiment, the minimum thickness of the annular outer frame of the box body 2 is a target thickness D4, the ratio of the first distance D1 to the corresponding target thickness D4 is a second ratio value, the second ratio value is greater than or equal to 0.005, and the second ratio value is less than or equal to 20.

[0171] It can be understood that the target thickness D4 can be obtained by measuring with a vernier caliper or a ruler in a non-working state of the battery pack under normal temperature and pressure.

[0172] Exemplarily, the second ratio is 0.005, 0.001, 0.05, 0.2, 5, 10, 15 or 20.

[0173] Exemplarily, the second ratio is 0.005, the first distance D1 is 1mm, and the target thickness D4 is 200mm.

[0174] Exemplarily, the second ratio is 0.01, the first distance D1 is 1mm, and the target thickness D4 is 100mm.

[0175] Exemplarily, the second ratio is 1, the first distance D1 is 1mm, and the target thickness D4 is 1mm.

[0176] Exemplarily, the second ratio is 0.05, the first distance D1 is 10mm, and the target thickness D4 is 200mm.

[0177] Exemplarily, the second ratio is 0.1, the first distance D1 is 10mm, and the target thickness D4 is 100mm.

[0178] Exemplarily, the second ratio is 10, the first distance D1 is 10mm, and the target thickness D4 is 1mm.

[0179] Exemplarily, the second ratio is 0.1, the first distance D1 is 20mm, and the target thickness D4 is 200mm.

[0180] Exemplarily, the second ratio is 0.2, the first distance D1 is 20mm, and the target thickness D4 is 100mm.

[0181] Exemplarily, the second ratio is 20, the first distance D1 is 1mm, and the target thickness D4 is 20mm.

[0182] It should be explained that the unit "mm" is millimeter.

[0183] In the embodiment of the application, the thickness of the outer frame of the box 2 affects the structural strength of the battery pack and the space utilization rate of the battery pack, and the connection of the first pole 131 of the battery monomer 1 and the second pole 132 of the adjacent battery monomer 1 connected by electricity also affects the structural strength of the battery pack. The ratio of the first distance D1 of the battery monomer 1 to the thickness of the outer frame of the box 2 is within a suitable range, which can meet the condition of the structural strength of the battery pack and improve the space utilization rate of the battery pack.

[0184] It can be understood that the second ratio is not limited in size.

[0185] In an embodiment, the second ratio is 0.002, the first distance D1 is 0.4mm, and the target thickness D4 is 200mm.

[0186] In an embodiment, the second ratio is 0.003, the first distance D1 is 0.6 mm, and the target thickness D4 is 200 mm.

[0187] In an embodiment, the second ratio is 0.004, the first distance D1 is 0.8 mm, and the target thickness D4 is 200 mm.

[0188] In an embodiment, the second ratio is 25, the first distance D1 is 25 mm, and the target thickness D4 is 1 mm.

[0189] In an embodiment, the second ratio is 30, the first distance D1 is 30 mm, and the target thickness D4 is 1 mm.

[0190] In an embodiment, the second ratio is 35, the first distance D1 is 35 mm, and the target thickness D4 is 1 mm.

[0191] In an embodiment, the battery monomer 1 and the outer frame of the box 2 are arranged at intervals.

[0192] In the embodiment of the application, the battery monomer 1 and the outer frame of the box 2 are arranged at intervals, which can play a buffering role and prevent the battery monomer 1 from impacting the outer frame of the box 2.

[0193] In an embodiment, the battery monomer 1 includes an explosion-proof valve 15 mounted on the shell 11, the shell wall of the shell 11 for mounting the explosion-proof valve 15 is a second shell wall 112, and the pole 13 is mounted on the shell wall of the shell 11 other than the second shell wall 112.

[0194] The explosion-proof valve 15 refers to a structure for discharging thermal runaway substances when the battery monomer 1 is in thermal runaway or abnormality.

[0195] In the embodiment of the application, the pole 13 and the explosion-proof valve 15 are located on different shell walls, and the thermal runaway substances discharged by the explosion-proof valve 15 avoid the position of the pole 13, preventing the thermal runaway substances from causing short circuit of the pole 13 and improving the safety of the battery monomer 1.

[0196] In an embodiment, the second shell wall 112 is located on the upper side of the shell 11.

[0197] In the embodiment of the application, the explosion-proof valve 15 is located on the second shell wall 112, and the second shell wall 112 is located on the upper side of the shell 11, that is, the explosion-proof valve 15 faces upward, and the impact resistance of the bottom of the battery pack is good.

[0198] In an embodiment, the second shell wall 112 is located on the lower side of the shell 11.

[0199] In the embodiment of the application, the explosion-proof valve 15 is located on the second shell wall 112, and the second shell wall 112 is located on the lower side of the shell 11, that is, the explosion-proof valve 15 faces downward, and the explosion-proof valve 15 discharges thermal runaway substances downward of the battery pack, which does not affect the structure above the battery pack and has good safety.

[0200] In an embodiment, the second shell wall 112 is located at a side of the shell 11 along a second direction, and the second direction is perpendicular to the direction in which the first pole 131 penetrates the first gap 141 and the up-down direction.

[0201] In the embodiment, the explosion-proof valve 15 is located on the second shell wall 112, and the second shell wall 112 is located at a side of the shell 11 along the second direction, i.e., the explosion-proof valve 15 is located at a side facing the second direction, so that the impact resistance of the bottom of the battery pack is good, and the battery monomer 1 is also convenient to stack along the up-down direction.

[0202] In an embodiment, the recessed area 14 is formed on the surface of the second pole 132, and the first pole 131 of one battery monomer 1 is connected to the recessed area 14 formed by the second pole 132 of another battery monomer 1.

[0203] In the embodiment, the area of the second pole 132 that can be connected with the first pole 131 is large, the position limitation of the connection between the first pole 131 and the second pole 132 is small, the precision requirement of the butt joint between the second pole 132 and the first pole 131 can be reduced, and the butt joint of the battery monomer 1 is facilitated.

[0204] In an embodiment, the recessed area 14 is formed on the shell 11, and the second pole 132 is located in the recessed area 14, and the first pole 131 of one battery monomer 1 is electrically connected with the second pole 132 in the recessed area 14 of another battery monomer 1.

[0205] In the embodiment, the first pole 131 is connected with the second pole 132 in the recessed area 14, the recessed area 14 can accommodate at least part of the first pole 131, the recessed area 14 is located on the shell 11, and the shape of the second pole 132 is not limited, so that the second pole 132 is facilitated to be processed.

[0206] In an embodiment, the first pole 131 has a first plug-in part 1311 and a first plug-in slot 1312, the first plug-in slot 1312 is located at a side of the first plug-in part 1311 facing the corresponding shell 11, the second pole 132 has a second plug-in part 1321 and a second plug-in slot 1322, the second plug-in slot 1322 is located at a side of the second plug-in part 1321 facing the corresponding shell 11, the first plug-in part 1311 of the first pole 131 is located in the second plug-in slot 1322 of the corresponding second pole 132 to be electrically connected, and the second plug-in part 1321 of the second pole 132 is located in the first plug-in slot 1312 of the corresponding first pole 131 to be electrically connected.

[0207] Exemplarily, the first pole 131 is clamped with the second pole 132 to be electrically connected.

[0208] In the embodiment of the present application, the first plug-in slot 1312 is located in the second plug-in part 1321, the second plug-in slot 1322 is located in the first plug-in part 1311, the first pole 131 is plugged with the corresponding second pole 132, the contact area of the electrical connection between the battery monomers 1 is increased, and the overcurrent capacity between the battery monomers 1 is improved.

[0209] In an embodiment, the first pole 131 also has a buffer groove 1313, and the buffer groove 1313 is located on the side of the first plug-in slot 1312 away from the first plug-in part 1311.

[0210] In the embodiment of the present application, the buffer groove 1313 leaves space for the expansion and deformation and movement of the battery monomer 1 in the case that the battery monomer 1 may expand and contract in the working state and the battery monomer 1 moves in the case that the battery pack is impacted. The buffer groove 1313 enables the first pole 131 to deform to a certain extent, and facilitates the installation of the first pole 131 and the second pole 132.

[0211] It can be understood that the first pole 131 is not limited to the buffer groove 1313.

[0212] In an embodiment, the buffer groove 1313 penetrates the first pole 131 upward, and the first plug-in slot 1312 penetrates the first pole 131 downward. In a second direction perpendicular to the upward and downward directions and the direction in which the first pole 131 penetrates the first gap 141, the buffer groove 1313 and the first plug-in slot 1312 both penetrate the opposite sides of the first pole 131.

[0213] In the embodiment of the present application, the buffer groove 1313 penetrates the first pole 131 upward and in the second direction, which is conducive to the deformation of the buffer groove 1313 in the first direction, and the buffer effect is good. The first plug-in slot 1312 penetrates the first pole 131 downward and in the second direction, which does not limit the connection direction of the corresponding second pole 132, and facilitates the connection with the corresponding second pole 132.

[0214] It can be understood that the buffer groove 1313 and the first plug-in slot 1312 are not limited to penetrating the first pole 131. For example, the buffer groove 1313 is closed, and the first plug-in slot 1312 is closed in the second direction.

[0215] In an embodiment, the battery monomer 1 includes a connecting piece 16. In two adjacent battery monomers 1 that are electrically connected to each other, the connecting piece 16 connects the first pole 131 of one of the battery monomers 1 and the second pole 132 of the other battery monomer 1, respectively.

[0216] For example, the connecting piece 16 connects the first pole 131 and the corresponding second pole 132 that are electrically connected, respectively, the first pole 131 is welded with the connecting piece 16, and the second pole 132 is welded with the connecting piece 16.

[0217] Exemplarily, the connecting piece 16 connects the first pole post 131 and the second pole post 132 corresponding in electric connection respectively, the first pole post 131 is locked with the connecting piece 16, and the second pole post 132 is locked with the connecting piece 16.

[0218] Exemplarily, the connecting piece 16 connects the first pole post 131 and the second pole post 132 corresponding in electric connection respectively, the first pole post 131 is riveted with the connecting piece 16, and the second pole post 132 is riveted with the connecting piece 16.

[0219] In the embodiment of the application, the first pole post 131 and the second pole post 132 corresponding in electric connection are connected through the connecting piece 16, the first pole post 131 and the second pole post 132 are connected stably, and it is also convenient to take power sampling from the connecting piece 16.

[0220] In an embodiment, in the upward-downward direction projection, the projection area of the first pole post 131 and the projection area of the second pole post 132 corresponding in electric connection at least partially overlap.

[0221] Exemplarily, the first pole post 131 and the second pole post 132 are connected through welding, locking or riveting.

[0222] In the embodiment of the application, the first pole post 131 and the second pole post 132 corresponding in electric connection have partial area overlap, the contact area of the first pole post 131 and the second pole post 132 is large, the contact surface resistance is low, and the overcurrent area is large, thereby improving the overcurrent capacity of the battery monomer 1.

[0223] In an embodiment, one of the wall surfaces of the recessed area 14 is a target surface 143, the target surface 143 is arranged opposite to the first gap 141, and the bare battery cell 12 is arranged on the opposite sides of the target surface 143 in the direction of penetrating the first gap 141 corresponding to the first pole post 131.

[0224] In the embodiment of the application, the bare battery cell 12 is arranged on the opposite sides of the target surface 143 of the recessed area 14, which can increase the volume of the bare battery cell 12 and improve the internal volume utilization rate of the battery monomer 1.

[0225] In an embodiment, one of the wall surfaces of the recessed area 14 is a target surface 143, the target surface 143 is arranged opposite to the first gap 141, the bare battery cell 12 is located on the side of the target surface 143 away from the first gap 141 in the direction of penetrating the first gap 141 corresponding to the first pole post 131, at least one shell wall of the shell 11 is a third shell wall 113, the third shell wall 113 is located on the side of the bare battery cell 12 toward the corresponding target surface 143 in the direction of penetrating the first gap 141 corresponding to the first pole post 131, the projection area of the third shell wall 113 in the direction of penetrating the first gap 141 corresponding to the first pole post 131 is a target area, and the projection area of at least one shell wall of the shell 11 in the thickness direction of the corresponding shell wall is greater than the target area.

[0226] In the embodiment of the present application, the bare cell 12 is located on the side away from the first notch 141, and the bare cell 12 is regular in shape, facilitating the manufacturing. The third shell wall 113 has a small area, which can reduce the space in the shell 11 on the side away from the bare cell 12, increase the space in the shell 11 that can accommodate the bare cell 12, and improve the volume utilization rate of the battery monomer 1.

[0227] It can be understood that the position of the recessed area 14 is not limited. For example, the recessed area 14 is located on the third shell wall 113 of the shell 11.

[0228] In an embodiment, the recessed area 14 has a second notch 142, and the opening direction of the second notch 142 is upward.

[0229] For example, the first pole 131 has a first insertion part 1311 and a first insertion slot 1312, the first insertion slot 1312 is located on the side of the first insertion part 1311 facing the corresponding shell 11, the second pole 132 has a second insertion part 1321 and a second insertion slot 1322, the second insertion slot 1322 is located on the side of the second insertion part 1321 facing the corresponding shell 11, the first insertion part 1311 of the first pole 131 is located in the second insertion slot 1322 of the corresponding second pole 132 to be electrically connected, the second insertion part 1321 of the second pole 132 is located in the first insertion slot 1312 of the corresponding first pole 131 to be electrically connected, the second notch 142 of the recessed area 14 is upward, and the first pole 131 is placed into the recessed area 14 from above to be connected with the corresponding second pole 132.

[0230] For example, the battery monomer 1 includes a connecting piece 16, in two adjacent battery monomers 1 electrically connected with each other, the connecting piece 16 respectively connects the first pole 131 of one of the battery monomers 1 and the second pole 132 of the other battery monomer 1, the second notch 142 of the recessed area 14 is upward, and the first pole 131 is located in the recessed area 14, facilitating the connecting piece 16 to be connected with the first pole 131 and the second pole 132 above the first pole 131 and the corresponding second pole 132 respectively through the second notch 142 from above.

[0231] In the embodiment of the present application, the second notch 142 is upward, facilitating the connection of the first pole 131 and the second pole 132, and facilitating the assembly of the adjacent battery monomers 1 electrically connected with each other.

[0232] In an embodiment, the side wall of the recessed area 14 surrounds the first notch 141, and the shape of the side wall of the recessed area 14 is a closed ring.

[0233] In the embodiment of the present application, the side wall of the recessed area 14 is a closed ring, which has a fixing effect on the first pole 131 located in the recessed area 14, and is beneficial to prevent the first pole 131 from being pulled out of the recessed area 14 from the upward and downward directions or the second direction.

[0234] In an embodiment, the first pole 131 and the second pole 132 are respectively installed on opposite sides of the shell 11.

[0235] In an embodiment, the battery cells 1 are continuously stacked in the direction of the first pole 131 and the second pole 132.

[0236] It can be understood that the first pole 131 and the second pole 132 are not limited to being installed on opposite sides of the shell 11. For example, the first pole 131 and the second pole 132 are installed on two adjacent shell walls of the shell 11.

[0237] In an embodiment, the battery pack includes a spacer 17, and the spacer 17 is arranged between adjacent battery cells 1.

[0238] For example, the spacer 17 is an aerogel thermal insulation pad.

[0239] For example, the spacer 17 is a ceramic fiber thermal insulation pad, which can withstand high temperature.

[0240] For example, the spacer 17 is a heat-conducting glue or a heat-conducting pad.

[0241] For example, the spacer 17 is a metal or a liquid cooling medium encapsulated by a metal sheet.

[0242] For example, the spacer 17 is a structural adhesive or a double-sided adhesive.

[0243] In an embodiment, the spacer 17 can play a buffering role in case of extrusion and vibration between adjacent battery cells 1.

[0244] It can be understood that the spacer 17 is not limited to being arranged between adjacent battery cells 1. For example, the adjacent battery cells 1 are in contact.

[0245] In an embodiment, the shape of the first pole 131 matches the shape of the recessed area 14.

[0246] For example, the shape of the first pole 131 is cylindrical, and the shape of the recessed area 14 is cylindrical.

[0247] For example, the shape of the first pole 131 is prismatic, and the shape of the recessed area 14 is prismatic.

[0248] In an embodiment, the shape of the recessed area 14 matches the shape of the first pole 131 under the condition that the recessed area 14 can accommodate the first pole 131, thereby improving the space utilization of the recessed area 14 and the internal space utilization of the battery cell 1.

[0249] In an embodiment, the shell 11 comprises a main body 114 and at least one cover plate 115 arranged on the main body 114, and the first pole 131 and / or the second pole 132 is arranged on the cover plate 115.

[0250] Exemplarily, the shell 11 comprises one cover plate 115, the first pole 131 is arranged on the cover plate 115, and the second pole 132 is arranged on the main body 114.

[0251] Exemplarily, the shell 11 comprises one cover plate 115, the second pole 132 is arranged on the cover plate 115, and the first pole 131 is arranged on the main body 114.

[0252] Exemplarily, the shell 11 comprises at least two cover plates 115, the first pole 131 is arranged on one of the cover plates 115, and the second pole 132 is arranged on the other cover plate 115.

[0253] In the embodiment of the present application, the pole 13 can be arranged on the cover plate 115, which facilitates the processing of the battery monomer 1.

[0254] It can be understood that the shell 11 is not limited to the cover plate 115. Exemplarily, the shell 11 is integrally formed.

[0255] In an embodiment, the shell 11 is square.

[0256] In the embodiment of the present application, the square shell 11 makes the contact area between the adjacent battery monomers 1 large, and the space utilization rate of the battery pack is high.

[0257] It can be understood that the shell 11 of the battery monomer 1 is not limited to square. Exemplarily, the shell 11 of the battery monomer 1 can be cylindrical, polygonal or other shapes, and the polygonal shape is, for example, hexagonal, and the present application is not particularly limited.

[0258] In an embodiment, at least two battery monomers 1 are installed in the box 2, the battery monomer 1 has a recessed area 14, the bare battery core 12 is installed in the shell 11, the pole 13 is installed in the shell 11, the pole 13 is electrically connected with the bare battery core 12, at least one pole 13 is a first pole 131 protruding out of the outer side of the shell 11, at least one pole 13 is a second pole 132, among two adjacent battery monomers 1 electrically connected with each other, the first pole 131 of one of the battery monomers 1 is located in the recessed area 14 of the other battery monomer 1 to be electrically connected with the corresponding second pole 132, the shell wall of the shell 11 for installing the first pole 131 is a first shell wall 111, the first pole 131 protrudes out of the outer side of the first shell wall 111, the end face of the end of the first pole 131 away from the bare battery core 12 is a first end face 1314, the distance between the first end face 1314 and the first shell wall 111 is a first distance D1, the recessed area 14 has a first gap 141, the first pole 131 penetrates the corresponding first gap 141 to extend to the corresponding recessed area 14, the direction in which the corresponding first pole 131 penetrates the first gap 141 is a first direction, the depth of the recessed area 14 along the first direction is a second distance D2, the first distance D1 is greater than or equal to 1mm, the first distance D1 is less than or equal to 10mm, the second distance D2 is greater than or equal to 1mm, the second distance D2 is less than or equal to 10mm, the span of the shell 11 along the first direction is a third distance D3, the ratio of the first distance D1 to the corresponding third distance D3 is a target ratio, the target ratio is greater than or equal to 0.0004, the target ratio is less than or equal to 0.4, the third distance D3 is greater than or equal to 10mm, the third distance D3 is less than or equal to 500mm, the minimum thickness of the annular outer frame of the box is a target thickness D4, the ratio of the first distance D1 to the corresponding target thickness D4 is a second ratio, the second ratio is greater than or equal to 0.005,second ratio is less than or equal to 20, the battery monomer 1 and the box 2 outer frame interval arrangement, for installing the shell wall of the shell 11 of the explosion-proof valve 15 is the second shell wall 112, the pole 13 is installed on the shell wall of the shell 11 except the second shell wall 112, the second shell wall 112 is located on the lower side of the shell 11, the recess area 14 is formed in the shell 11, the second pole 132 is located in the recess area 14, one of the first pole 131 of the battery monomer 1 and the second pole 132 in the recess area 14 of the other battery monomer 1 are electrically connected, the first pole 131 has a first plug-in part 1311 and a first plug-in slot 1312, the first plug-in slot 1312 is located on the side of the first plug-in part 1311 towards the corresponding shell 11, the second pole 132 has a second plug-in part 1321 and a second plug-in slot 1322, the second plug-in slot 1322 is located on the side of the second plug-in part 1321 towards the corresponding shell 11, the first plug-in part 1311 of the first pole 131 is located in the second plug-in slot 1322 of the corresponding electrically connected second pole 132, the second plug-in part 1321 of the second pole 132 is located in the first plug-in slot 1312 of the corresponding electrically connected first pole 131, the first pole 131 further has a buffer slot 1313, the buffer slot 1313 is located on the side of the first plug-in slot 1312 away from the first plug-in part 1311, the buffer slot 1313 penetrates the first pole 131 upwards, the first plug-in slot 1312 penetrates the pole 13 downwards, in the second direction perpendicular to the upward and downward directions and the direction in which the first pole 131 penetrates the corresponding first notch 141, the buffer slot 1313 and the first plug-in slot 1312 both penetrate the opposite sides of the first pole 131, one of the wall surfaces of the recess area 14 is the target surface 143, the target surface 143 is arranged opposite to the first notch 141, the bare cell 12 is arranged on the opposite sides of the target surface 143 along the direction in which the first pole 131 penetrates the first notch 141, the recess area 14 has a second notch 142, the opening direction of the second notch 142 is upward, the first pole 131 and the second pole 132 are respectively installed on the opposite sides of the shell 11, the spacer 17 is arranged between the adjacent battery monomers 1, the first pole 131 and / or the second pole 132 is installed on the cover plate 115, the shell 11 is square. The position of the explosion-proof valve 15 is away from the pole 13, the safety of the battery monomer 1 is improved, the space saved by the pole 13 in the recess area 14 can store electrolyte and bare cells 12, the cycle performance of the battery monomer 1 is improved, the service life of the battery monomer 1 is increased, the poles 13 of the electrically connected battery monomers 1 are protruding and recessed area 14 assembly, the overall rigidity of the battery pack is enhanced.

[0259] The above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for part or all of the technical features; and 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, and they should be covered in the scope of the present application. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the present application. Those skilled in the art will readily understand that the above only describes the preferred embodiments of the present application and is not intended to limit the present application, and any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A battery pack, comprising: a box body; a plurality of battery cells installed in the box body, the number of the battery cells being at least two, the battery cells having a recessed area, the battery cells comprising a shell, a bare cell installed in the shell, and a pole installed on the shell and electrically connected to the bare cell, at least one of the poles being a first pole protruding outside the shell, and at least one of the poles being a second pole, the first pole of one of the battery cells being located in the recessed area of the other of the battery cells to be electrically connected to the corresponding second pole. 2.The battery pack of claim 1, wherein a shell wall of the shell for installing the first pole is a first shell wall, the first pole protrudes outside the first shell wall, an end face of an end of the first pole away from the bare cell is a first end face, a distance between the first end face and the first shell wall is a first distance, the recessed area has a first notch, the first pole penetrates through the corresponding first notch to extend into the corresponding recessed area, a direction in which the first pole penetrates through the first notch is a first direction, a depth of the recessed area along the first direction is a second distance, the first distance is greater than or equal to 1 mm, the first distance is less than or equal to 20 mm, the second distance is greater than or equal to 1 mm, and the second distance is less than or equal to 20 mm. 3.The battery pack of claim 2, wherein the first distance is greater than or equal to 1 mm, the first distance is less than or equal to 10 mm, the second distance is greater than or equal to 1 mm, and the second distance is less than or equal to 10 mm. 4.The battery pack of claim 2 or 3, wherein a span of the shell along the corresponding first direction is a third distance, a ratio of the first distance to the corresponding third distance is a target ratio, the target ratio is greater than or equal to 0.0004, the target ratio is less than or equal to 0.4, the third distance is greater than or equal to 10 mm, and the third distance is less than or equal to 2500 mm. 5.The battery pack of claim 4, wherein the third distance is greater than or equal to 10 mm, and the third distance is less than or equal to 500 mm. 6.The battery pack of any one of claims 2 to 5, wherein a minimum thickness of a ring-shaped outer frame of the box body is a target thickness, a ratio of the first distance to the corresponding target thickness is a second ratio, the second ratio is greater than or equal to 0.005, and the second ratio is less than or equal to 20. 7.The battery pack of any one of claims 1 to 6, wherein the battery cell comprises an explosion-proof valve installed on the shell, a shell wall of the shell for installing the explosion-proof valve is a second shell wall, and the pole is installed on other shell walls of the shell except the second shell wall.

8. The battery pack of claim 7, wherein the second cell wall is located on an upper side of the housing, or the second cell wall is located on a lower side of the housing, or the second cell wall is located on a side of the housing along a second direction perpendicular to the direction in which the first pole penetrates the first opening and the up-down direction.

9. The battery pack of any one of claims 1-8, wherein the recessed region is formed on a surface of the second pole, and wherein the first pole of one of the battery cells is connected to the recessed region formed by the second pole of another of the battery cells.

10. The battery pack of any one of claims 1-8, wherein the recessed region is formed on the housing, and wherein the second pole is located in the recessed region, and wherein the first pole of one of the battery cells is electrically connected to the second pole in the recessed region of another of the battery cells.

11. The battery pack of claim 10, wherein the first pole has a first insertion portion and a first insertion slot, the first insertion slot being located on a side of the first insertion portion facing the corresponding housing, the second pole has a second insertion portion and a second insertion slot, the second insertion slot being located on a side of the second insertion portion facing the corresponding housing, the first insertion portion of the first pole is located in the second insertion slot of the corresponding electrically connected second pole, and the second insertion portion of the second pole is located in the first insertion slot of the corresponding electrically connected first pole.

12. The battery pack of claim 11, wherein the first pole further has a buffer slot, the buffer slot being located on a side of the first insertion slot facing away from the first insertion portion.

13. The battery pack of claim 12, wherein the buffer slot penetrates the first pole along an upward direction, and the first insertion slot penetrates the first pole along a downward direction, and wherein the buffer slot and the first insertion slot both penetrate opposite sides of the first pole along a second direction perpendicular to both the up-down direction and the direction in which the first pole penetrates the corresponding first opening.

14. The battery pack of claim 10, wherein the battery cells include a connecting member, and wherein the connecting member connects the first pole of one of the battery cells and the second pole of another of the battery cells electrically connected to each other.

15. The battery pack of any one of claims 10-13, wherein a projection of the first pole along the up-down direction at least partially overlaps a projection of the corresponding electrically connected second pole along the up-down direction.

16. The battery pack of any one of claims 1-15, wherein one of the walls of the recessed region is a target surface, the target surface is located opposite the first opening, and the bare cell spans opposite sides of the target surface along the direction in which the first pole penetrates the first opening.

17. The battery pack of any one of claims 1-15, wherein one wall of the recessed region is a target surface, the target surface is disposed opposite the first opening, the bare cell is disposed on a side of the target surface opposite the first opening in a direction corresponding to the first pole passing through the first opening, at least one shell wall of the shell is a third shell wall, the third shell wall is disposed on a side of the bare cell facing the target surface in a direction corresponding to the first pole passing through the first opening, a projected area of the third shell wall in the direction corresponding to the first pole passing through the first opening is a target area, and a projected area of at least one shell wall of the shell in a thickness direction of the corresponding shell wall is greater than the target area.

18. The battery pack of any one of claims 1-17, wherein the recessed region has a second opening, and the second opening is upwardly oriented.

19. The battery pack of any one of claims 1-17, wherein a sidewall of the recessed region surrounds the first opening, and the sidewall of the recessed region has a shape of a closed ring.

20. The battery pack of any one of claims 1-19, wherein the first pole and the second pole are respectively mounted on opposite sides of the shell.

21. The battery pack of any one of claims 1-20, comprising a separator disposed between adjacent battery cells.

22. The battery pack of any one of claims 1-21, wherein the first pole has a shape matching a shape of the recessed region.

23. The battery pack of any one of claims 1-22, wherein the shell comprises a main body and at least one cover plate configured to cover the main body, and the first pole and / or the second pole are mounted on the cover plate.

24. The battery pack of any one of claims 1-23, wherein the shell has a square shape.

25. An electric device, comprising: a main body; and a battery pack of any one of claims 1-24, configured to supply power to the main body.

26. An energy storage device, comprising: an outer case; and a battery pack of any one of claims 1-24, mounted in the outer case. ​ ​ ​ ​

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