Battery pack, power utilization device and energy storage device

Abstract

The utility model discloses a battery pack, a power utilization device and a power storage device, and belongs to the technical field of batteries, the battery pack comprises a box body and battery monomers, at least two battery monomers are mounted in the box body, each battery monomer is provided with a sunken area, each battery monomer comprises a shell, a naked battery cell and a pole, the naked battery cell is mounted in the shell, and the pole is mounted in the shell. The pole columns are installed in the shell and are electrically connected with the naked battery cell, at least one pole column is a first pole column protruding out of the outer side of the shell, at least one pole column is a second pole column, and in every two adjacent battery single bodies which are electrically connected with each other, the pole columns are arranged in the shell. And the first pole of one battery monomer is positioned in the concave area of the other battery monomer so as to be electrically connected with the corresponding second pole. The protruding first pole is located in the concave area and connected with the second pole, so that the space occupied by gaps of the poles in the battery pack is reduced, and the volume utilization rate of the battery pack is improved. Through the cooperation of the convex first pole and the concave area, the battery monomers are butted into a group, so that the overall rigidity of the battery pack can be enhanced.

Description

Technical Field

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

[0002] New energy batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also being increasingly used in areas such as energy storage.

[0003] In the related art, the volume utilization rate of the battery pack is low. Utility Model Content

[0004] In order to solve the above technical problems, the present application provides a battery pack, an electrical device and an energy storage device to improve the volume utilization of the battery pack.

[0005] This application is implemented through the following technical solutions.

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

[0007] Box;

[0008] A battery cell is installed in the box, the number of the battery cells is at least two, the battery cell has a recessed area, the battery cell includes a shell, a bare cell and a pole, the bare cell is installed in the shell, the pole is installed in the shell, the pole is electrically connected to the bare cell, at least one pole is a first pole protruding from the outside of the shell, at least one pole is a second pole, and among two adjacent battery cells electrically connected to each other, the first pole of one of the battery cells is located in the recessed area of ​​the other battery cell to be electrically connected to the corresponding second pole.

[0009] In the solution of the embodiment of the present application, the protruding first pole is located in the recessed area and connected to the second pole, thereby improving the volume utilization of the battery pack. Through the cooperation of the protruding first pole and the recessed area, the overall rigidity of the battery pack can be enhanced.

[0010] In one embodiment, the shell wall of the shell for installing the first pole is a first shell wall, the first pole protrudes from the outside of the first shell wall, the end face of the first pole facing away from the bare battery cell is a first end face, the distance between the first end face and the first shell wall is a first distance, the recessed area has a first opening, the first pole passes through the corresponding first opening to extend to the corresponding recessed area, the direction in which the first pole passes through the first opening is a first direction, the 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.

[0011] In the embodiment of the present application, the first distance and the second distance are within a suitable range, which is beneficial to improving the volume utilization of the battery cell.

[0012] In one 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.

[0013] In the embodiment of the present application, the first distance and the second distance are within a suitable range, which is beneficial to improving the volume utilization of the battery cell.

[0014] In one embodiment, the span of the shell along the first direction is a third distance, the 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.

[0015] In the embodiment of the present application, the ratio of the first distance to the span of the battery cell along the first direction is within an appropriate range, which can improve the volume utilization of the battery cell while taking into account the normal docking of the first pole and the second pole and satisfying the space required for the connection.

[0016] In one embodiment, the third distance is greater than or equal to 10 mm, and the third distance is less than or equal to 500 mm.

[0017] In the embodiment of the present application, the third distance is within a suitable range, which is conducive to satisfying the connection strength between the first pole and the second pole.

[0018] In one embodiment, the minimum thickness of the annular outer frame of the box body is the target thickness, the 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.

[0019] In the embodiment of the present application, the ratio of the first distance between the battery cells and the thickness of the outer frame of the box body is within an appropriate range, which can improve the space utilization of the battery pack while satisfying the structural strength of the battery pack.

[0020] In one embodiment, the battery cell includes an explosion-proof valve installed on the shell, the 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.

[0021] In the embodiment of the present application, the thermal runaway material discharged by the explosion-proof valve avoids the location of the pole, preventing the thermal runaway material from causing a short circuit in the pole, thereby improving the safety of the battery cell.

[0022] In one 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 passes through the first opening and the up and down directions respectively.

[0023] In the embodiment 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, and the explosion-proof valve discharges thermal runaway substances to the bottom of the battery pack, which will not affect the structure above the battery pack and has good safety. The explosion-proof valve faces the side of the second direction, and the bottom of the battery pack has good impact resistance, which also facilitates the stacking of battery cells in the up and down direction.

[0024] In one embodiment, the recessed area is formed on the surface of the second pole, wherein the first pole of one of the battery cells is connected to the recessed area formed by the second pole of another of the battery cells.

[0025] In the embodiment of the present application, the connection position between the first pole and the second pole is less restricted, which can reduce the precision requirement for docking the second pole with the first pole, and facilitate the docking of the battery cell.

[0026] In one embodiment, the recessed area is formed in the shell, and the second pole is located in the recessed area, wherein the first pole of one of the battery cells is electrically connected to the second pole in the recessed area of ​​another of the battery cells.

[0027] In the embodiment of the present application, the shape of the second pole is not restricted, which facilitates the processing of the second pole.

[0028] In one embodiment, the first pole has a first plug-in portion and a first plug-in slot, the first plug-in slot is located on the side of the first plug-in portion corresponding to the shell, the second pole has a second plug-in portion and a second plug-in slot, the second plug-in slot is located on the side of the second plug-in portion corresponding to the shell, the first plug-in portion of the first pole is located in the second plug-in slot of the corresponding electrically connected second pole, and the second plug-in portion of the second pole is located in the first plug-in slot of the corresponding electrically connected first pole.

[0029] In the embodiment of the present application, the first pole is plugged into the corresponding second pole, which increases the contact area of ​​the electrical connection between the battery cells, and is beneficial to improving the current carrying capacity between the battery cells.

[0030] In one embodiment, the first pole further has a buffer groove, and the buffer groove is located on a side of the first plug-in groove away from the first plug-in portion.

[0031] In the embodiment of the present application, the buffer groove leaves space for the battery cell to expand, shrink, deform and move. The buffer groove also allows the first pole to produce a certain deformation, which facilitates the installation of the first pole and the second pole.

[0032] In one embodiment, the buffer groove passes through the first pole upward, the first plug-in groove passes through the pole downward, the recessed area has a first opening, and in a second direction that is perpendicular to the up and down directions and the direction in which the first pole passes through the corresponding first opening, the buffer groove and the first plug-in groove both pass through opposite sides of the first pole.

[0033] In the embodiment 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 has a good buffering effect. The first plug-in slot penetrates the first pole downward and in the second direction, does not limit the connection direction of the corresponding second pole, and is convenient for connection with the corresponding second pole.

[0034] In one embodiment, the battery cell includes a connector, and in two adjacent battery cells that are electrically connected to each other, the connector respectively connects the first pole of one of the battery cells and the second pole of the other battery cell.

[0035] In the embodiment of the present application, the first pole and the corresponding electrically connected second pole are connected by a connecting member, the first pole and the corresponding second pole are firmly connected, and it is convenient to take electrical samples from the connecting member.

[0036] In one embodiment, when projected in the up-down direction, the projection area of ​​the first pole at least partially overlaps with the projection area of ​​the corresponding electrically connected second pole.

[0037] In the embodiment of the present application, the contact area between the first pole and the second pole is large, the contact surface resistance is low, and the flow area is large, thereby improving the flow capacity of the battery cell.

[0038] In one embodiment, one of the walls of the recessed area is a target surface, the recessed area has a first opening, the target surface is arranged opposite to the first opening, and the bare battery cell is arranged on opposite sides of the target surface along a direction corresponding to the first pole passing through the first opening.

[0039] In the embodiment of the present application, the bare cell is arranged on opposite sides of the target surface along the direction corresponding to the first pole passing through the first opening, which can increase the volume of the bare cell and improve the internal volume utilization of the battery cell.

[0040] In one embodiment, one of the walls of the recessed area is a target surface, the recessed area has a first opening, the target surface is arranged opposite to the first opening, the bare cell is located on the side of the target surface away from the first opening along the 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 located on the side of the bare cell facing the target surface along the direction corresponding to the first pole passing through the first opening, the projection area of ​​the third shell wall along the direction corresponding to the first pole passing through the first opening is the target area, and the projection area of ​​at least one shell wall of the shell along the thickness direction of the corresponding shell wall is greater than the target area.

[0041] In the embodiment of the present application, the bare cell has a regular shape and is easy to manufacture. The area of ​​the third shell wall is small, which can reduce the space on the side of the target surface in the shell away from the bare cell, increase the space in the shell that can accommodate the bare cell, and improve the volume utilization of the battery cell.

[0042] In one embodiment, the recessed area has a second opening, and the opening direction of the second opening faces upward.

[0043] In the embodiment of the present application, the second opening faces upward to facilitate the connection between the first pole and the second pole, and to facilitate the assembly of adjacent electrically connected battery cells.

[0044] In one embodiment, the sidewall of the recessed area surrounds the first opening, and the sidewall of the recessed area is in a closed ring shape.

[0045] In the embodiment of the present application, the first pole located in the recessed area has a fixing effect, which is helpful to prevent the first pole from escaping from the recessed area in the up and down direction or the second direction.

[0046] In one embodiment, the first pole and the second pole are respectively mounted on opposite sides of the housing.

[0047] In the embodiment of the present application, it is convenient to continuously stack battery cells along the direction of the first pole and the second pole.

[0048] In one embodiment, the battery pack includes a spacer, and the spacer is arranged between adjacent battery cells.

[0049] In the embodiment of the present application, extrusion and vibration may occur between adjacent battery cells, and the spacer can play a buffering role.

[0050] In one embodiment, the shape of the first pole matches the shape of the recessed area.

[0051] In the embodiment of the present application, the space utilization rate of the recessed area is improved, thereby improving the internal space utilization rate of the battery cell.

[0052] In one embodiment, the housing includes a main body and at least one cover plate disposed on the main body, and the first pole and / or the second pole is mounted on the cover plate.

[0053] In the embodiment of the present application, the pole can be installed on the cover plate to facilitate the processing of the battery cell.

[0054] In one embodiment, the housing is square.

[0055] In the embodiment of the present application, the square shell enables a large contact area between adjacent battery cells and a high space utilization rate of the battery pack.

[0056] A second aspect of an embodiment of the present application provides an electrical device, including:

[0057] main body;

[0058] Any of the above-mentioned battery packs is used to supply power to the main body.

[0059] A third aspect of an embodiment of the present application provides a power storage device, comprising:

[0060] outer box;

[0061] Any of the above-mentioned battery packs is installed in the outer box.

[0062] Utility Model Effect

[0063] In the battery pack of the embodiment of the present application, the protruding first pole is located in the recessed area and connected to the second pole, which reduces the space occupied by the gap for arranging the poles in the battery pack and improves the volume utilization of the battery pack. The first pole of a battery cell is located in the recessed area of ​​another battery cell and connected to the corresponding second pole. By cooperating with the protruding first pole and the recessed area, the battery cells are docked into groups, which can enhance the overall rigidity of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0065] Figure 1 A schematic diagram of the structure of a battery pack according to an embodiment of the present application;

[0066] Figure 2 An exploded view of a battery pack according to an embodiment of the present application;

[0067] Figure 3 The schematic diagram of the structure of the battery cell of the battery pack in the embodiment of the present application shows the second pole and the cover plate;

[0068] Figure 4 A schematic diagram of the battery cell structure of a battery pack according to an embodiment of the present application, showing a first pole and a cover plate;

[0069] Figure 5 It is an assembly diagram of a battery cell and a box body of a battery pack of an embodiment of the present application, and an explosion-proof valve is not shown in the figure;

[0070] Figure 6 It is an assembly diagram of a battery cell and a box body of a battery pack of an embodiment of the present application, and the explosion-proof valve is shown facing the second direction;

[0071] Figure 7 It is an assembly diagram of a battery cell and a box body of a battery pack of an embodiment of the present application, in which the explosion-proof valve is shown facing upward;

[0072] Figure 8 Schematic diagram of the structure of a battery cell of a battery pack in an embodiment of the present application, in which in the second direction perpendicular to the up-down direction and the direction in which the first pole penetrates the corresponding first opening, the second pole is located on one side of the shell, and a groove is formed in the shell;

[0073] Fig. 9 Schematic diagram of the battery cell structure of the battery pack of the embodiment of the present application, in which the first pole is located on the other side of the shell in the second direction which is perpendicular to the up-down direction and the direction in which the first pole passes through the corresponding first opening;

[0074] Fig.10 for Figure 8 The enlarged view at a in the middle;

[0075] Fig.11 for Fig. 9 Enlarged view of point b in the middle

[0076] Fig.12It is a battery cell assembly diagram of a battery pack of an embodiment of the present application, in which in the second direction which is perpendicular to the up-down direction and the direction in which the first pole passes through the corresponding first opening, the first pole and the second pole are arranged at intervals, and the connecting member is connected to the first pole and the second pole respectively;

[0077] Fig.13 for Fig.12 Sectional view at jj in the middle;

[0078] Fig.14 for Fig.12 Sectional view at kk;

[0079] Fig.15 for Fig.14 The enlarged view at c in the middle;

[0080] Fig.16 Schematic diagram of the battery cell structure of the battery pack of the embodiment of the present application, in which the second pole extends from one side of the shell to the other side in the second direction which is perpendicular to the up-down direction and the direction in which the first pole passes through the corresponding first opening;

[0081] Fig.17 Schematic diagram of a battery cell structure of a battery pack of an embodiment of the present application, in which the first pole extends from one side of the shell to the other side in the second direction which is perpendicular to the up-down direction and the direction in which the first pole passes through the corresponding first opening;

[0082] Fig.18 for Fig.16 The enlarged view at point d in the middle;

[0083] Fig.19 for Fig.17 The enlarged view at e in the middle;

[0084] Fig. 20 This is a battery cell assembly diagram of a battery pack of an embodiment of the present application, in which a first pole and a corresponding second pole are stacked;

[0085] Fig.21 for Fig. 20 Sectional view at mm;

[0086] Fig. 22 for Fig.21 Enlarged view at point f in the middle;

[0087] Fig.23 A schematic diagram of a battery cell structure of a battery pack according to an embodiment of the present application, showing an end of the housing facing the second pole, the second pole having a second plug-in slot;

[0088] Fig.24This is a schematic diagram of the battery cell structure of the battery pack of an embodiment of the present application, showing one end of the shell facing the first pole, and the first pole has a buffer groove;

[0089] Fig.25 for Fig.23 Enlarged view at center g;

[0090] Fig.26 for Fig.24 Enlarged view at h in the middle;

[0091] Fig. 27 This is a battery cell assembly diagram of a battery pack of an embodiment of the present application, in which a second pole with a second plug-in slot and a first pole with a buffer slot are buckled with each other;

[0092] Fig.28 for Fig. 27 Sectional view at nn;

[0093] Fig.29 for Fig.28 The enlarged view at i in the middle;

[0094] Fig.30 This is a schematic diagram of the structure of a battery cell according to an embodiment of the present application, in which a bare battery cell is arranged across two opposite sides of a target surface;

[0095] Fig.31 This is a schematic diagram of the structure of a battery cell in an embodiment of the present application, in which the bare battery cell is located on one side of the target surface.

[0096] Fig.32 This is a schematic diagram of the structure of a battery cell according to an embodiment of the present application, in which a recessed area is formed on the pole.

[0097] Description of Reference Numerals

[0098] 1. Battery cell; 11. Shell; 111. First shell wall; 112. Second shell wall; 113. Third shell wall; 114. Main body; 115. Cover plate; 12. Bare battery cell; 13. Pole; 131. First pole; 1311. First plug-in portion; 1312. First plug-in slot; 1313. Buffer slot; 1314. First end face; 132. Second pole; 1321. Second plug-in portion; 1322. Second plug-in slot; 14. Recessed area; 141. First opening; 142. Second opening; 143. Target surface; 15. Explosion-proof valve; 16. Connector; 17. Spacer; 2. Box; D1. First distance; D2. Second distance; D3. Third distance; D4. Target thickness. DETAILED DESCRIPTION

[0099] 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.

[0100] 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; the terms "including" and "having" in the embodiments of this application and any variations thereof are intended to cover non-exclusive inclusions.

[0101] In the description of the embodiments of the present application, the technical terms "first", "second", "third", 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. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0102] 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.

[0103] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0104] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0105] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0106] In the related art, a battery pack is usually composed of at least two battery cells 1 connected in series or in parallel. Adjacent electrically connected battery cells 1 are connected via poles 13. The poles 13 protrude from the surface of the shell 11 of the battery cell 1. A gap is required between two adjacent battery cells 1 for arranging the poles 13. The gap for arranging the poles 13 occupies the internal space of the battery pack, and the volume utilization rate of the battery pack is low.

[0107] In the battery pack of the embodiment of the present application, the first pole 131 of one battery cell 1 is located in the recessed area 14 of another battery cell 1 to be electrically connected to the corresponding second pole 132 , thereby improving the volume utilization of the battery pack.

[0108] The battery pack according to the embodiment of the present application can be applied to power-consuming devices and energy storage devices.

[0109] An electric device is a device that uses electric energy as energy and realizes corresponding functions by consuming electric energy. For example, the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0110] The power-consuming device of the embodiment of the present application may include a main body 114 and a battery pack of any embodiment, and the battery pack supplies power to the main body 114 .

[0111] The main body 114 refers to the structure of the main body 114 that consumes electric energy to realize corresponding functions. For example, the power-consuming device may be a mobile phone, and the main body 114 is the part that can realize functions such as communication, and the battery pack supplies power to the part that can realize functions such as communication. For example, the power-consuming device may be a car, and the main body 114 is the part that can be used for people to sit and travel on the road, and the battery pack supplies power to the part that can be used for people to sit and travel on the road.

[0112] The electrical device of an embodiment of the present application is taken as an example of a vehicle.

[0113] The vehicle provided in one embodiment of the present application 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, head or tail 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. The vehicle may also include a controller and a motor, and the controller may be used to control the battery pack to power the motor. For example, the battery pack may be used for starting, navigating and operating power requirements of the vehicle during driving.

[0114] In some embodiments of the present application, the battery pack can be used not only as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0115] An embodiment of the present application further provides an energy storage device, which includes an outer box and a battery pack according to any one of the embodiments, wherein the battery pack is installed in the outer box.

[0116] The outer box is a container for containing objects, and most of the components of the energy storage device are arranged in the outer box.

[0117] The energy storage box is a device that can store electrical energy in the battery pack.

[0118] The battery pack of the embodiment of the present application includes a case 2 and a battery cell 1, the battery cell 1 is installed in the case 2, the number of the battery cells 1 is at least two, the battery cell 1 has a recessed area 14, the battery cell 1 includes a shell 11, a bare cell 12 and a pole 13, the bare cell 12 is installed in the shell 11, the pole 13 is installed in the shell 11, the pole 13 is electrically connected to the bare cell 12, at least one pole 13 is a first pole 131 protruding from the outside of the shell 11, and at least one pole 13 is a second pole 132. Among two adjacent battery cells 1 electrically connected to each other, the first pole 131 of one battery cell 1 is located in the recessed area 14 of the other battery cell 1 to be electrically connected to the corresponding second pole 132.

[0119] The number of battery cells 1 is at least two, and at least two battery cells 1 can be connected in series, in parallel, or in mixed connection. Mixed connection means that at least two battery cells 1 are both connected in series and in parallel. At least two battery cells 1 can be directly connected in series, in parallel, or in mixed connection, and then the whole composed of multiple battery cells 1 is placed in the box 2. The battery pack may also include other structures, for example, the battery pack may also include a busbar component for realizing electrical connection between at least two battery cells 1.

[0120] The battery cell 1 refers to a basic unit that can realize mutual conversion between chemical energy and electrical energy.

[0121] The battery cell 1 may be a secondary battery. A secondary battery refers to a battery cell 1 that can be continuously used by activating active materials by charging after the battery cell 1 is discharged.

[0122] The battery cell 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 storage battery, etc., which is not limited in the embodiments of the present application.

[0123] Exemplarily, the bare battery cell 12 may be a laminated battery cell or a square wound battery cell.

[0124] For example, one end of the pole 13 may be connected to a busbar, and the other end may be connected to an external conductor, or the other end may be connected to a pole of an adjacent battery cell 1 .

[0125] For the convenience of explanation, the first direction and the second direction are set, and the first direction, the second direction and the up-down direction are directions intersecting 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. Figure 2 and Figure 3 As shown by the arrows in the middle, the direction of arrow X is the first direction, the direction of arrow Y is the second direction, and the direction of arrow Z is the up-down direction.

[0126] Exemplarily, the intersection includes perpendicular intersection, the first direction perpendicularly intersects the second direction, the first direction perpendicularly intersects the up-down direction, and the second direction perpendicularly intersects the up-down direction.

[0127] The box body 2 refers to a structure with a containing space. The battery cell 1 is located in the box body 2. The box body 2 contains the battery cell 1, thereby providing a certain degree of protection for the battery cell 1 and reducing the risk of the battery cell 1 being exposed to the outside and damaged.

[0128] Exemplarily, the material of the box body 2 can be metal.

[0129] Exemplarily, the material of the box body 2 may be plastic.

[0130] Exemplarily, the housing 2 may be sealed.

[0131] In the battery pack of the embodiment of the present application, the protruding first pole 131 is located in the recessed area 14 and connected to the second pole 132. The recessed area 14 of the adjacent battery cell 1 accommodates the corresponding first pole 131, which reduces the space occupied by the gap between the adjacent battery cells 1 for arranging the corresponding first pole 131 and improves the volume utilization of the battery pack. The first pole 131 of the battery cell 1 is located in the recessed area 14 of another battery cell 1 and connected to the corresponding second pole 132. The protruding first pole 131 cooperates with the recessed area 14 to allow the battery cells 1 to be docked into a group, which can enhance the overall rigidity of the battery pack.

[0132] In one embodiment, the shell wall of the shell 11 for installing the first pole 131 is the first shell wall 111, the first pole 131 protrudes from the outside of the first shell wall 111, the end face of the first pole 131 away from the bare battery cell 12 is the first end face 1314, the distance between the first end face 1314 and the first shell wall 111 is the first distance D1, the recessed area 14 has a first opening 141, the first pole 131 passes through the corresponding first opening 141 to extend to the corresponding recessed area 14, the direction in which the corresponding first pole 131 passes through the first opening 141 is the first direction, the depth of the recessed area 14 along the first direction is the 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.

[0133] It is understandable that the first distance D1 can be measured by a vernier caliper or a ruler in a non-operating state with the battery cell 1 powered off at a normal temperature and pressure.

[0134] It is understandable that the second distance D2 can be measured by a vernier caliper or a ruler in a non-operating state with the battery cell 1 powered off at a normal temperature and pressure.

[0135] Exemplarily, the first distance D1 is 1 mm, 5 mm, 9 mm, 16 mm or 20 mm.

[0136] Exemplarily, the second distance D2 is 1 mm, 4 mm, 9 mm, 13 mm or 20 mm.

[0137] It should be explained that the unit "mm" means millimeter.

[0138] In the embodiment of the present application, the first distance D1 and the second distance D2 are within a suitable range, and under the condition that the space required for connecting the first pole 131 with the corresponding second pole 132 is satisfied, it is beneficial to improve the volume utilization of the battery cell 1.

[0139] It is understandable that the first distance D1 and the second distance D2 are not limited in size. In one embodiment, the first distance D1 is 25 mm and the second distance D2 is 25 mm.

[0140] In one 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.

[0141] Exemplarily, the first distance D1 is 1 mm, 3 mm, 8 mm or 10 mm.

[0142] Exemplarily, the second distance D2 is 1 mm, 3 mm, 7 mm or 10 mm.

[0143] It should be explained that the unit "mm" means millimeter.

[0144] In the embodiment of the present application, the first distance D1 and the second distance D2 are within a suitable range, and under the condition that the space required for connecting the first pole 131 with the corresponding second pole 132 is satisfied, it is beneficial to improve the volume utilization of the battery cell 1.

[0145] In one 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.

[0146] It is understandable that the third distance D3 can be measured by a vernier caliper or a ruler in a non-working state with the battery cell 1 powered off at normal temperature and pressure.

[0147] Illustratively, the target ratio is 0.0004, 0.001, 0.06, 0.15, 0.3, or 0.4.

[0148] Exemplarily, the third distance D3 is 10 mm, 300 mm, 500 mm, 1000 mm, 2000 mm or 2500 mm.

[0149] Exemplarily, the target ratio is 0.0004, the first distance D1 is 1 mm, and the third distance D3 is 2500 mm.

[0150] Exemplarily, the target ratio is 0.001, the first distance D1 is 1 mm, and the third distance D3 is 1000 mm.

[0151] Exemplarily, the target ratio is 0.02, the first distance D1 is 1 mm, and the third distance D3 is 50 mm.

[0152] Exemplarily, the target ratio is 0.004, the first distance D1 is 10 mm, and the third distance D3 is 2500 mm.

[0153] Exemplarily, the target ratio is 0.01, the first distance D1 is 10 mm, and the third distance D3 is 1000 mm.

[0154] Exemplarily, the target ratio is 0.2, the first distance D1 is 10 mm, and the third distance D3 is 50 mm.

[0155] Exemplarily, the target ratio is 0.008, the first distance D1 is 20 mm, and the third distance D3 is 2500 mm.

[0156] Exemplarily, the target ratio is 0.02, the first distance D1 is 20 mm, and the third distance D3 is 1000 mm.

[0157] Exemplarily, the target ratio is 0.4, the first distance D1 is 20 mm, and the third distance D3 is 50 mm.

[0158] It should be explained that the unit "mm" means millimeter.

[0159] In the embodiment of the present application, the first distance D1 determines the connection space between the first pole 131 and the corresponding second pole 132. The connection between the first pole 131 and the corresponding second pole 132 needs to meet a certain connection strength to be normally connected. The ratio of the first distance D1 to the span of the battery cell 1 along the first direction is within an appropriate range, which can take into account the normal connection between the first pole 131 and the second pole 132 and meet the space required for the connection, thereby improving the volume utilization of the battery cell 1.

[0160] It is to be understood that the target ratio may be any size.

[0161] Exemplarily, the target ratio is 0.00016, the first distance D1 is 0.4 mm, and the third distance D3 is 2500 mm.

[0162] Exemplarily, the target ratio is 0.00024, the first distance D1 is 0.6 mm, and the third distance D3 is 2500 mm.

[0163] Exemplarily, the target ratio is 0.00032, the first distance D1 is 0.8 mm, and the third distance D3 is 2500 mm.

[0164] Exemplarily, the target ratio is 0.5, the first distance D1 is 25 mm, and the third distance D3 is 50 mm.

[0165] Exemplarily, the target ratio is 0.6, the first distance D1 is 30 mm, and the third distance D3 is 50 mm.

[0166] Exemplarily, the target ratio is 0.7, the first distance D1 is 35 mm, and the third distance D3 is 50 mm.

[0167] In one 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.

[0168] In the embodiment of the present application, the span of the battery cell 1 along the first direction is within a suitable range, which is conducive to satisfying the connection strength between the first pole 131 and the corresponding second pole 132 .

[0169] In one embodiment, the minimum thickness of the annular outer frame of the box body 2 is the 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, and the second ratio is less than or equal to 20.

[0170] It is understandable that the target thickness D4 can be measured by a vernier caliper or a ruler in a non-working state with the battery pack powered off and at normal temperature and pressure.

[0171] Exemplarily, the second ratio is 0.005, 0.001, 0.05, 0.2, 5, 10, 15 or 20.

[0172] Exemplarily, the second ratio is 0.005, the first distance D1 is 1 mm, and the target thickness D4 is 200 mm.

[0173] Exemplarily, the second ratio is 0.01, the first distance D1 is 1 mm, and the target thickness D4 is 100 mm.

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

[0175] Exemplarily, the second ratio is 0.05, the first distance D1 is 10 mm, and the target thickness D4 is 200 mm.

[0176] Exemplarily, the second ratio is 0.1, the first distance D1 is 10 mm, and the target thickness D4 is 100 mm.

[0177] Exemplarily, the second ratio is 10, the first distance D1 is 10 mm, and the target thickness D4 is 1 mm.

[0178] Exemplarily, the second ratio is 0.1, the first distance D1 is 20 mm, and the target thickness D4 is 200 mm.

[0179] Exemplarily, the second ratio is 0.2, the first distance D1 is 20 mm, and the target thickness D4 is 100 mm.

[0180] Exemplarily, the second ratio is 20, the first distance D1 is 1 mm, and the target thickness D4 is 20 mm.

[0181] It should be explained that the unit "mm" means millimeter.

[0182] In the embodiment of the present application, the thickness of the outer frame of the box body 2 affects the structural strength of the battery pack and the space utilization of the battery pack. The connection between the first pole 131 of the battery cell 1 and the second pole 132 of the adjacent electrically connected battery cell 1 also affects the structural strength of the battery pack. The ratio of the first distance D1 of the battery cell 1 to the thickness of the outer frame of the box body 2 is within an appropriate range, which can improve the space utilization of the battery pack while meeting the condition of the structural strength of the battery pack.

[0183] It can be understood that the second ratio is not limited in size.

[0184] In one embodiment, the second ratio is 0.002, the first distance D1 is 0.4 mm, and the target thickness D4 is 200 mm.

[0185] In one embodiment, the second ratio is 0.003, the first distance D1 is 0.6 mm, and the target thickness D4 is 200 mm.

[0186] In one embodiment, the second ratio is 0.004, the first distance D1 is 0.8 mm, and the target thickness D4 is 200 mm.

[0187] In one embodiment, the second ratio is 25, the first distance D1 is 25 mm, and the target thickness D4 is 1 mm.

[0188] In one embodiment, the second ratio is 30, the first distance D1 is 30 mm, and the target thickness D4 is 1 mm.

[0189] In one embodiment, the second ratio is 35, the first distance D1 is 35 mm, and the target thickness D4 is 1 mm.

[0190] In one embodiment, the battery cells 1 and the outer frame of the box body 2 are arranged at intervals.

[0191] In the embodiment of the present application, the battery cells 1 are spaced apart from the outer frame of the box body 2 , which can play a buffering role and prevent the battery cells 1 from hitting the outer frame of the box body 2 .

[0192] In one embodiment, the battery cell 1 includes an explosion-proof valve 15 installed on the housing 11 , the housing wall of the housing 11 for installing the explosion-proof valve 15 is the second housing wall 112 , and the pole 13 is installed on other housing walls of the housing 11 except the second housing wall 112 .

[0193] The explosion-proof valve 15 is a structure for discharging thermal runaway substances when thermal runaway or abnormality occurs in the battery cell 1 .

[0194] In the embodiment of the present 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 to prevent the thermal runaway substances from causing a short circuit in the pole 13, thereby improving the safety of the battery cell 1.

[0195] In one embodiment, the second shell wall 112 is located on the upper side of the housing 11 .

[0196] In the embodiment of the present 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 bottom of the battery pack has good impact resistance.

[0197] In one embodiment, the second shell wall 112 is located at the lower side of the housing 11 .

[0198] In the embodiment of the present 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 to the bottom of the battery pack, which will not affect the structure above the battery pack and has good safety.

[0199] In one embodiment, the second shell wall 112 is located at one side of the shell 11 along a second direction, and the second direction is perpendicular to a direction in which the first pole 131 passes through the first opening 141 and an up-down direction.

[0200] In the embodiment of the present application, the explosion-proof valve 15 is located on the second shell wall 112, and the second shell wall 112 is located on one side of the shell 11 along the second direction, that is, the side of the explosion-proof valve 15 facing the second direction. The bottom of the battery pack has good impact resistance and is convenient for stacking the battery cells 1 in the up and down directions.

[0201] In one embodiment, the recessed area 14 is formed on the surface of the second pole 132 , wherein the first pole 131 of one battery cell 1 is connected to the recessed area 14 formed by the second pole 132 of another battery cell 1 .

[0202] In the embodiment of the present application, the area of ​​the second pole 132 that can be connected to the first pole 131 is large, and the connection position restriction between the first pole 131 and the second pole 132 is small, which can reduce the accuracy requirement for docking the second pole 132 with the first pole 131, and facilitate the docking of the battery cell 1.

[0203] In one embodiment, the recessed area 14 is formed in the housing 11 , and the second pole 132 is located in the recessed area 14 , wherein the first pole 131 of one battery cell 1 is electrically connected to the second pole 132 in the recessed area 14 of another battery cell 1 .

[0204] In the embodiment of the present application, the first pole 131 is located in the recessed area 14 and connected to the second pole 132. The recessed area 14 can at least accommodate part of the first pole 131. The recessed area 14 is located in the shell 11. The shape of the second pole 132 is not restricted, which facilitates the processing of the second pole 132.

[0205] In one embodiment, the first pole 131 has a first plug-in portion 1311 and a first plug-in slot 1312, the first plug-in slot 1312 is located on the side of the first plug-in portion 1311 facing the corresponding shell 11, the second pole 132 has a second plug-in portion 1321 and a second plug-in slot 1322, the second plug-in slot 1322 is located on the side of the second plug-in portion 1321 facing the corresponding shell 11, the first plug-in portion 1311 of the first pole 131 is located in the second plug-in slot 1322 of the corresponding electrically connected second pole 132, and the second plug-in portion 1321 of the second pole 132 is located in the first plug-in slot 1312 of the corresponding electrically connected first pole 131.

[0206] Exemplarily, the first pole 131 is snap-fitted with the corresponding electrically connected second pole 132 .

[0207] In the embodiment of the present application, the first plug-in slot 1312 is located in the second plug-in portion 1321, and the second plug-in slot 1322 is located in the first plug-in portion 1311. The first pole 131 and the corresponding second pole 132 are plugged into each other, increasing the contact area of ​​the electrical connection between the battery cells 1, which is beneficial to improving the current carrying capacity between the battery cells 1.

[0208] In one embodiment, the first pole 131 further has a buffer groove 1313 , and the buffer groove 1313 is located at a side of the first plugging groove 1312 away from the first plugging portion 1311 .

[0209] In the embodiment of the present application, when the battery cell 1 may expand or contract during operation and when the battery pack is impacted and the battery cell 1 moves, the buffer groove 1313 leaves space for the expansion, contraction, deformation and movement of the battery cell 1. The buffer groove 1313 allows the first pole 131 to deform to a certain extent, which facilitates the installation of the first pole 131 and the second pole 132.

[0210] It is understandable that the first pole 131 is not limited to being provided with the buffer groove 1313 .

[0211] In one embodiment, the buffer groove 1313 penetrates the first pole 131 upwardly, and the first plugging groove 1312 penetrates the pole 13 downwardly, and the recessed area 14 has a first opening 141. In a second direction that is perpendicular to the up and down directions and the direction in which the first pole 131 penetrates the corresponding first opening 141, the buffer groove 1313 and the first plugging groove 1312 both penetrate the opposite sides of the first pole 131.

[0212] 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 buffering effect is good. The first plug-in groove 1312 penetrates the first pole 131 downward and in the second direction, does not limit the connection direction of the corresponding second pole 132, and is convenient for connection with the corresponding second pole 132.

[0213] It is understandable that the buffer slot 1313 and the first plugging slot 1312 are not limited to penetrating the first pole 131. Exemplarily, the buffer slot 1313 is closed, and the first plugging slot 1312 is closed in the second direction.

[0214] In one embodiment, the battery cell 1 includes a connector 16 . In two adjacent battery cells 1 that are electrically connected to each other, the connector 16 respectively connects the first pole 131 of one of the battery cells 1 and the second pole 132 of the other battery cell 1 .

[0215] Exemplarily, the connecting member 16 respectively connects the first pole 131 and the corresponding electrically connected second pole 132 , the first pole 131 is welded to the connecting member 16 , and the second pole 132 is welded to the connecting member 16 .

[0216] Exemplarily, the connector 16 respectively connects the first pole 131 and the corresponding electrically connected second pole 132 , the first pole 131 is locked to the connector 16 , and the second pole 132 is locked to the connector 16 .

[0217] Exemplarily, the connector 16 respectively connects the first pole 131 and the corresponding electrically connected second pole 132 , the first pole 131 is riveted to the connector 16 , and the second pole 132 is riveted to the connector 16 .

[0218] In the embodiment of the present application, the first pole 131 and the corresponding electrically connected second pole 132 are connected by the connecting member 16 . The first pole 131 and the corresponding second pole 132 are firmly connected, and it is convenient to take electrical samples from the connecting member 16 .

[0219] In one embodiment, when projected in the up-down direction, the projection area of ​​the first pole 131 at least partially overlaps with the projection area of ​​the corresponding electrically connected second pole 132 .

[0220] Exemplarily, the first pole 131 and the second pole 132 are connected by welding, locking or riveting.

[0221] In the embodiment of the present application, the first pole 131 partially overlaps with the corresponding electrically connected second pole 132 , the first pole 131 and the second pole 132 have a large contact area, low contact surface resistance, and a large current flow area, thereby improving the current flow capacity of the battery cell 1 .

[0222] In one embodiment, one of the walls of the recessed area 14 is a target surface 143, the recessed area 14 has a first opening 141, the target surface 143 is arranged opposite to the first opening 141, and the bare battery cell 12 is arranged on opposite sides of the target surface 143 along the direction in which the corresponding first pole 131 passes through the first opening 141.

[0223] In the embodiment of the present application, the bare cell 12 is arranged across two opposite sides of the target surface 143 of the recessed area 14 , which can increase the volume of the bare cell 12 and improve the internal volume utilization of the battery cell 1 .

[0224] In one embodiment, one of the walls of the recessed area 14 is a target surface 143, the recessed area 14 has a first opening 141, the target surface 143 is arranged opposite to the first opening 141, the bare cell 12 is located on the side of the target surface 143 away from the first opening 141 along the direction in which the corresponding first pole 131 passes through the first opening 141, 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 cell 12 facing the corresponding target surface 143 along the direction in which the corresponding first pole 131 passes through the first opening 141, the projection area of ​​the third shell wall 113 along the direction in which the corresponding first pole 131 passes through the first opening 141 is the target surface 143 area, and the projection area of ​​at least one shell wall of the shell 11 along the thickness direction of the corresponding shell wall is greater than the target surface 143 area.

[0225] In the embodiment of the present application, the bare cell 12 is located on the side away from the first opening 141, and the bare cell 12 has a regular shape and is easy to manufacture. The third shell wall 113 has a small area, which can reduce the space on the side of the target surface 143 in the shell 11 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 cell 1.

[0226] It is understandable that the position of the recessed area 14 is not limited. Exemplarily, the recessed area 14 is located on the third shell wall 113 of the shell 11 .

[0227] In one embodiment, the recessed area 14 has a second opening 142 , and the opening direction of the second opening 142 faces upward.

[0228] Exemplarily, the first pole 131 has a first plug-in portion 1311 and a first plug-in slot 1312, the first plug-in slot 1312 is located on the side of the first plug-in portion 1311 facing the corresponding shell 11, the second pole 132 has a second plug-in portion 1321 and a second plug-in slot 1322, the second plug-in slot 1322 is located on the side of the second plug-in portion 1321 facing the corresponding shell 11, the first plug-in portion 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 portion 1321 of the second pole 132 is located in the first plug-in slot 1312 of the corresponding electrically connected first pole 131, the second opening 142 of the recessed area 14 faces upward, and the first pole 131 is placed in the recessed area 14 from above to connect with the corresponding second pole 132.

[0229] Exemplarily, the battery cell 1 includes a connector 16. Among two adjacent battery cells 1 electrically connected to each other, the connector 16 respectively connects the first pole 131 of one of the battery cells 1 and the second pole 132 of the other battery cell 1. The second opening 142 of the recessed area 14 faces upward, and the first pole 131 is located in the recessed area 14, so that the connector 16 can be connected to the first pole 131 and the second pole 132 respectively above the first pole 131 and the corresponding second pole 132 through the second opening 142 from above.

[0230] In the embodiment of the present application, the second opening 142 faces upward to facilitate the connection between the first pole 131 and the second pole 132 , and to facilitate the assembly of adjacent electrically connected battery cells 1 .

[0231] In one embodiment, the sidewall of the recessed area 14 surrounds the first opening 141 , and the sidewall of the recessed area 14 is in a closed ring shape.

[0232] 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 helpful to prevent the first pole 131 from escaping from the recessed area 14 in the up and down direction or the second direction.

[0233] In one embodiment, the first pole 131 and the second pole 132 are respectively installed on opposite sides of the housing 11 .

[0234] In the embodiment of the present application, it is convenient to continuously stack the battery cells 1 along the direction of the first pole 131 and the second pole 132 .

[0235] It is understandable that the first pole 131 and the second pole 132 are not limited to being installed on opposite sides of the housing 11. Exemplarily, the first pole 131 and the second pole 132 are installed on two adjacent housing walls of the housing 11.

[0236] In one embodiment, the battery pack includes a spacer 17 , and the spacer 17 is disposed between adjacent battery cells 1 .

[0237] Exemplarily, the spacer 17 is an aerogel insulation pad.

[0238] Exemplarily, the spacer 17 is a ceramic fiber thermal insulation pad that is resistant to high temperatures.

[0239] Exemplarily, the spacer 17 is a thermally conductive adhesive or a thermally conductive pad.

[0240] Exemplarily, the spacer 17 is metal or a liquid cooling medium encapsulated by a metal sheet.

[0241] Exemplarily, the spacer 17 is a structural adhesive or a double-sided adhesive.

[0242] In the embodiment of the present application, squeezing and vibration may occur between adjacent battery cells 1, and the spacer 17 can play a buffering role.

[0243] It is understandable that the spacers 17 are not limited to be disposed between adjacent battery cells 1. Exemplarily, adjacent battery cells 1 are in contact with each other.

[0244] In one embodiment, the shape of the first pole 131 matches the shape of the recessed area 14 .

[0245] Exemplarily, the shape of the first pole 131 is cylindrical, and the shape of the recessed area 14 is cylindrical.

[0246] Exemplarily, the first pole 131 is in a prism shape, and the recessed area 14 is in a prism shape.

[0247] In the embodiment of the present application, under the condition that the recessed area 14 can accommodate the first pole 131, the shape of the recessed area 14 matches the shape of the first pole 131, thereby improving the space utilization of the recessed area 14 and thus improving the internal space utilization of the battery cell 1.

[0248] In one embodiment, the housing 11 includes a main body 114 and at least one cover plate 115 covering the main body 114 , and the first pole 131 and / or the second pole 132 are mounted on the cover plate 115 .

[0249] Exemplarily, there is one cover plate 115 , the first pole 131 is mounted on the cover plate 115 , and the second pole 132 is mounted on the body 114 .

[0250] Exemplarily, there is one cover plate 115 , the second pole 132 is mounted on the cover plate 115 , and the first pole 131 is mounted on the main body 114 .

[0251] Exemplarily, there are at least two cover plates 115 , the first pole 131 is installed on one of the cover plates 115 , and the second pole 132 is installed on the other of the cover plates 115 .

[0252] In the embodiment of the present application, the pole 13 can be installed on the cover plate 115 to facilitate the processing of the battery cell 1.

[0253] It is understandable that the housing 11 is not limited to being provided with the cover plate 115. Exemplarily, the housing 11 is integrally formed.

[0254] In one embodiment, the housing 11 is square.

[0255] In the embodiment of the present application, the square housing 11 increases the contact area between adjacent battery cells 1 and improves the space utilization of the battery pack.

[0256] It is understandable that the housing 11 of the battery cell 1 is not limited to a square shape. For example, the housing 11 of the battery cell 1 may be cylindrical, polygonal, or other shapes, such as a hexagonal shape, etc., and the present application has no particular limitation.

[0257] In one embodiment, at least two battery cells 1 are installed in the box body 2, the battery cell 1 has a recessed area 14, the bare battery cell 12 is installed in the shell 11, the pole 13 is installed in the shell 11, the pole 13 is electrically connected to the bare battery cell 12, at least one pole 13 is a first pole 131 protruding from the outside of the shell 11, and at least one pole 13 is a second pole 132. Among the two adjacent battery cells 1 electrically connected to each other, the first pole 131 of one battery cell 1 is located in the recessed area 14 of the other battery cell 1 to be electrically connected to the corresponding second pole 132. The shell wall of the shell 11 for installing the first pole 131 is the first shell wall 111, the first pole 131 protrudes from the outside of the first shell wall 111, the end face of the first pole 131 facing away from the bare battery cell 12 is the first end face 1314, the distance between the first end face 1314 and the first shell wall 111 is the first distance D1, and the recessed area 14 has a first opening The first pole 131 passes through the corresponding first opening 141 to extend to the corresponding recessed area 14. The direction in which the corresponding first pole 131 passes through the first opening 141 is the first direction. The depth of the recessed area 14 along the first direction is the second distance D2. The first distance D1 is greater than or equal to 1 mm, and 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. The span of the shell 11 along the first direction is the third distance D3. The ratio of the first distance D1 to the corresponding third distance D3 is the target ratio. The target ratio is greater than or equal to 0.0004, and 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 500 mm. The minimum thickness of the annular outer frame of the body is the target thickness D4. The ratio of the first distance D1 to the corresponding target thickness D4 is the second ratio, and the second ratio is greater than or equal to 0.005, the second ratio is less than or equal to 20, the battery cell 1 and the outer frame of the box body 2 are arranged at intervals, the shell wall of the shell 11 for installing the explosion-proof valve 15 is the second shell wall 112, the pole 13 is installed on the shell wall other than the second shell wall 112 on the shell 11, the second shell wall 112 is located on the lower side of the shell 11, the recessed area 14 is formed in the shell 11, the second pole 132 is located in the recessed area 14, wherein the first pole 131 of a battery cell 1 is electrically connected to the second pole 132 in the recessed area 14 of another battery cell 1, and the first pole 131 has The first plug-in portion 1311 and the first plug-in slot 1312, the first plug-in slot 1312 is located on the side of the first plug-in portion 1311 facing the corresponding housing 11, the second pole 132 has a second plug-in portion 1321 and a second plug-in slot 1322, the second plug-in slot 1322 is located on the side of the second plug-in portion 1321 facing the corresponding housing 11, the first plug-in portion 1311 of the first pole 131 is located in the second plug-in slot 1322 of the corresponding electrically connected second pole 132, and the second plug-in portion 1321 of the second pole 132 is located at the first pole 132 of the corresponding electrically connected The first pole 131 also has a buffer groove 1313 in the first plugging groove 1312 of the pole 131. The buffer groove 1313 is located on the side of the first plugging groove 1312 away from the first plugging portion 1311. The buffer groove 1313 penetrates the first pole 131 upwardly, and the first plugging groove 1312 penetrates the pole 13 downwardly. In the second direction which is perpendicular to the up-down direction and the direction in which the first pole 131 penetrates the corresponding first opening 141, the buffer groove 1313 and the first plugging groove 1312 penetrate the opposite sides of the first pole 131. The recessed area 14 One of the walls is a target surface 143, which is arranged opposite to the first opening 141. The bare cell 12 is arranged on opposite sides of the target surface 143 along the direction in which the corresponding first pole 131 passes through the first opening 141. The recessed area 14 has a second opening 142, and the opening direction of the second opening 142 faces upward. The first pole 131 and the second pole 132 are respectively installed on opposite sides of the shell 11. A spacer 17 is arranged between adjacent battery cells 1. The first pole 131 and / or the second pole 132 are installed on the cover plate 115. The shell 11 is square. The explosion-proof valve 15 is located away from the pole 13 to improve the safety of the battery cell 1. The pole 13 is located in the recessed area 14, and the space saved can be used to store electrolyte and bare cell 12, which improves the cycle performance of the battery cell 1 and increases the service life of the battery cell 1. The pole 13 of the electrically connected battery cell 1 is assembled with the protrusion and recessed area 14 to enhance the overall rigidity of the battery pack. .

[0258] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application is described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents; 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 all be included in the scope of the present application. In particular, as long as there is no structural conflict, the various technical features 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 that fall within the scope of the present application.

Claims

1. A battery pack, characterized in that: include: Box; A battery cell is installed in the box, the number of the battery cells is at least two, the battery cell has a recessed area, the battery cell includes a shell, a bare cell and a pole, the bare cell is installed in the shell, the pole is installed in the shell, the pole is electrically connected to the bare cell, at least one pole is a first pole protruding from the outside of the shell, at least one pole is a second pole, and among two adjacent battery cells electrically connected to each other, the first pole of one of the battery cells is located in the recessed area of ​​the other battery cell to be electrically connected to the corresponding second pole.

2. The battery pack according to claim 1, characterized in that: The shell wall of the shell for installing the first pole is the first shell wall, the first pole protrudes from the outside of the first shell wall, the end face of the first pole facing away from the bare battery cell is the first end face, the distance between the first end face and the first shell wall is the first distance, the recessed area has a first opening, the first pole passes through the corresponding first opening to extend to the corresponding recessed area, the direction in which the first pole passes through the first opening is the first direction, the depth of the recessed area along the first direction is the 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 according to claim 2, characterized in that: 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 according to claim 2, characterized in that: The span of the shell along the first direction corresponding to the third distance is a third distance, the 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 10mm, and the third distance is less than or equal to 2500mm.

5. The battery pack according to claim 4, characterized in that: 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 according to claim 2, characterized in that: The minimum thickness of the annular outer frame of the box body is the target thickness, the 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 according to claim 1, characterized in that: The battery cell includes an explosion-proof valve installed on the shell, the 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 according to claim 7, characterized in that: 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 passes through the first opening and the up and down direction respectively.

9. The battery pack according to claim 1, characterized in that: The recessed area is formed on the surface of the second pole, wherein the first pole of one of the battery cells is connected to the recessed area formed by the second pole of another of the battery cells.

10. The battery pack according to claim 1, characterized in that: The recessed area is formed in the shell, and the second pole is located in the recessed area, wherein the first pole of one of the battery cells is electrically connected to the second pole in the recessed area of ​​another of the battery cells.

11. The battery pack according to claim 1, characterized in that: The first pole has a first plug-in portion and a first plug-in slot, the first plug-in slot is located on the side of the first plug-in portion facing the corresponding shell, the second pole has a second plug-in portion and a second plug-in slot, the second plug-in slot is located on the side of the second plug-in portion facing the corresponding shell, the first plug-in portion of the first pole is located in the second plug-in slot of the corresponding electrically connected second pole, and the second plug-in portion of the second pole is located in the first plug-in slot of the corresponding electrically connected first pole.

12. The battery pack according to claim 11, characterized in that: The first pole further has a buffer groove, and the buffer groove is located at a side of the first plug-in groove away from the first plug-in portion.

13. The battery pack according to claim 12, characterized in that: The buffer slot passes through the opening corresponding to the first pole upward, and the first plug-in slot passes through the pole downward. The recessed area has a first opening. In a second direction that is perpendicular to the up and down directions and the direction in which the first pole passes through the corresponding first opening, the buffer slot and the first plug-in slot both pass through opposite sides of the first pole.

14. The battery pack according to claim 1, characterized in that: The battery cell comprises a connector, and in two adjacent battery cells electrically connected to each other, the connector respectively connects the first pole of one of the battery cells and the second pole of the other battery cell.

15. The battery pack according to claim 1, characterized in that: Projected in the up-down direction, the projection area of ​​the first pole at least partially overlaps with the projection area of ​​the corresponding electrically connected second pole.

16. The battery pack according to any one of claims 1 to 15, characterized in that: One of the walls of the recessed area is a target surface, the recessed area has a first opening, the target surface is arranged opposite to the first opening, and the bare battery cell is arranged on opposite sides of the target surface along a direction corresponding to the first pole passing through the first opening.

17. The battery pack according to any one of claims 1 to 15, characterized in that: One of the walls of the recessed area is a target surface, the recessed area has a first opening, the target surface is arranged opposite to the first opening, the bare cell is located on the side of the target surface away from the first opening along the 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 located on the side of the bare cell facing the target surface along the direction corresponding to the first pole passing through the first opening, the projection area of ​​the third shell wall along the direction corresponding to the first pole passing through the first opening is the target area, and the projection area of ​​at least one shell wall of the shell along the thickness direction of the corresponding shell wall is greater than the target area.

18. The battery pack according to any one of claims 1 to 15, characterized in that: The recessed area has a second opening, and the opening direction of the second opening faces upward.

19. The battery pack according to any one of claims 1 to 15, characterized in that: The side wall of the recessed area surrounds the first opening, and the side wall of the recessed area is in a closed ring shape.

20. The battery pack according to any one of claims 1 to 15, characterized in that: The first pole and the second pole are respectively installed on opposite sides of the shell.

21. The battery pack according to any one of claims 1 to 15, characterized in that: The battery pack includes a spacer, and the spacer is arranged between adjacent battery cells.

22. The battery pack according to any one of claims 1 to 15, characterized in that: The shape of the first pole matches the shape of the recessed area.

23. The battery pack according to any one of claims 1 to 15, characterized in that: The housing includes a main body and at least one cover plate disposed on the main body, and the first pole and / or the second pole is mounted on the cover plate.

24. The battery pack according to any one of claims 1 to 15, characterized in that: The shell is square.

25. An electrical device, characterized in that: include: main body; The battery pack according to any one of claims 1 to 24, used to supply power to the main body.

26. An energy storage device, characterized in that: include: outer box; The battery pack according to any one of claims 1 to 24, installed in the outer box.

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