Battery pack, power utilization device, energy storage device and assembly method of battery pack

Abstract

The embodiment of the invention provides a battery pack, a power utilization device, an energy storage device and an assembly method of the battery pack, and belongs to the technical field of batteries. The battery pack comprises a box body and battery units, an accommodating cavity is formed in the box body, and the height direction of the box body is a first direction; the battery units are arranged in the accommodating cavity, one or more groups of battery units are arranged, and the multiple groups of battery units are arranged in a second direction under the condition that the multiple groups of battery units are arranged; each group of battery units comprises at least two battery monomers arranged along a third direction; wherein the battery monomer is provided with a first end face and a second end face which are opposite in the first direction, and the projections of the first end face and the second end face in the first direction are at least partially staggered. According to the battery pack, the energy density of the battery pack can be improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery pack, an electrical device, an energy storage device, and a method for assembling the battery pack. Background Technology

[0002] The battery cells of the battery pack are installed inside a casing. Energy is stored by charging the battery cells inside the casing or by discharging the battery cells inside the casing to supply power to the outside. In related technologies, the volumetric energy density of the battery pack is relatively low. Summary of the Invention

[0003] In view of this, the embodiments of this application aim to provide a battery pack, an electrical device, an energy storage device, and a method for assembling the battery pack, with the goal of improving the volumetric energy density of the battery pack.

[0004] To achieve the above objectives, the technical solution of this application embodiment is implemented as follows:

[0005] This application provides a battery pack, including:

[0006] The box has an internal cavity, and the height direction of the box is a first direction;

[0007] A battery cell is disposed within the accommodating cavity. The battery cell is configured as one or more groups. When the battery cell is configured as multiple groups, the multiple groups of battery cells are arranged in a second direction. Each group of battery cells includes at least two battery cells arranged along a third direction.

[0008] The battery cell has a first end face and a second end face opposite each other in the first direction, and the projections of the first end face and the second end face in the first direction are at least partially misaligned.

[0009] In this embodiment, the projections of the first and second end faces of the battery cell in the first direction are at least partially offset, causing at least a portion of the side face of the battery cell to be tilted relative to the first direction. This increases the distance from the first end face to the second end face, which, while keeping the height of the battery cells approximately the same, helps to increase the volume of a single battery cell. With the energy demand of the battery pack remaining roughly the same, increasing the volume of a single battery cell helps to reduce the number of battery cells, thus reducing the proportion of the battery cell's terminals and tabs within the battery pack housing. This helps to increase the volume ratio of the electrode assembly within the battery pack, thereby improving the energy density of the battery pack.

[0010] In one embodiment, the battery cell has two first sides opposite to each other in the third direction and two second sides opposite to each other in the second direction, wherein the first sides and the second sides are connected to the first end face and the second end face, and the two opposite first sides are inclined relative to the first direction.

[0011] In this embodiment, the side where two adjacent battery cells in the same battery unit abut against each other is called the first side. The first side is inclined relative to the first direction, so that the weight of the battery cell acts on the adjacent battery cells in the same battery unit, which helps to restrict the movement of the battery cells along the first direction, thereby reducing the amount of adhesive used between the battery cells and the casing along the first direction. The weight of the battery cell can be decomposed into a component force along the first side of the battery cell and a component force perpendicular to the first side of the battery cell. The component force perpendicular to the first side of the battery cell can increase the friction between adjacent battery cells, which helps to restrict the relative movement between adjacent battery cells in the same battery unit, thereby reducing the amount of adhesive used between adjacent battery cells and lowering the battery production cost. The reduction in the amount of adhesive used between adjacent battery cells and between the battery cells and the casing along the first direction reduces the volume ratio of adhesive, which helps to increase the volume ratio of the battery cells in the casing, thereby improving the energy density of the battery pack.

[0012] In one embodiment, the area of ​​the first side is larger than the area of ​​the second side.

[0013] In this embodiment, the area of ​​the first side is larger than the area of ​​the second side, such that the larger first sides of the battery cells are arranged sequentially along a third direction, and the first sides of the battery cells face the corresponding first sides of adjacent battery cells in the same battery cell along the third direction. The larger first sides of adjacent battery cells in the same battery cell are in contact with each other, which helps to increase the contact area between adjacent battery cells, and thus helps to reduce the possibility of adjacent battery cells moving along the second direction.

[0014] In one embodiment, the angle between the first side and the first direction ranges from 0° to 90°.

[0015] In this embodiment, as the angle between the first side and the first direction increases, the size of the battery cell along the first direction decreases. The effect of part of the weight of the battery cell acting on adjacent battery cells in the same battery unit becomes more obvious, which is more conducive to restricting the movement of the battery cell along the first direction. The component of the weight of the battery cell perpendicular to the first side is also larger, which is also more conducive to restricting the relative movement between adjacent battery cells in the same battery unit. This helps to reduce the amount of adhesive used between the battery cell and the casing along the first direction and between adjacent battery cells, thereby reducing the production cost of the battery pack.

[0016] In one embodiment, the angle between the first side and the first direction ranges from 30° to 60°.

[0017] In this embodiment, the angle between the first side and the first direction is limited to a reasonable range. In the case of some electrical devices that have size requirements in the first direction, it is beneficial to limit the size of the battery cell in the first direction to a reasonable range, thereby limiting the size of the battery pack in the first direction to a reasonable range, which in turn helps to improve the overall strength of the battery pack.

[0018] In one embodiment, the angle between the first side and the first direction is 45°.

[0019] In this embodiment of the application, the angle between the first side and the first direction is limited to 45°. In the case of some electrical devices that have size requirements in the first direction, it is beneficial to reasonably limit the size of the battery cell in the first direction, thereby reasonably limiting the size of the battery pack in the first direction, which in turn helps to improve the overall strength of the battery pack.

[0020] In one embodiment, the ratio of the area of ​​the overlapping projections of the first end face and the second end face in the first direction to the projected area of ​​the first end face in the first direction is in the range of 0.3 to 0.6.

[0021] In this embodiment, the ratio of the area of ​​the first end face and the second end face overlapping in the first direction to the area of ​​the first end face projected in the first direction is limited to a reasonable range, so that the angle between the first side face and the first direction can also be limited to a reasonable range. In the case of some electrical devices that have size requirements in the first direction, it is beneficial to limit the size of the battery cell in the first direction to a reasonable range, thereby limiting the size of the battery pack in the first direction to a reasonable range, which in turn is beneficial to improving the overall strength of the battery pack.

[0022] In one embodiment, the ratio of the area of ​​the first end face and the second end face projected in the first direction to the area of ​​the first end face projected in the first direction is 0.5.

[0023] In this embodiment, the ratio of the area of ​​the first end face and the second end face overlapping in the first direction to the area of ​​the first end face projected in the first direction is limited to 0.5. This makes the angle between the first side face and the first direction more reasonable. In the case of some electrical devices that have size requirements in the first direction, it is beneficial to limit the size of the battery cell in the first direction more reasonably, thereby limiting the size of the battery pack in the first direction more reasonably, which in turn helps to improve the overall strength of the battery pack.

[0024] In one embodiment, the projection area of ​​the first end face along the first direction is a first region, the projection area of ​​the second end face along the first direction is a second region, the first region is at least partially located on one side of the second region along the third direction, and the second region is at least partially located on one side of the first region along the third direction.

[0025] In this embodiment, the first region is at least partially located on one side of the second region along a third direction, and the second region is at least partially located on one side of the first region along a third direction. This allows the first side of the battery cell to be inclined relative to the first direction and along the third direction, enabling the battery cell to reduce its size along the first direction, thereby reducing the height of the battery pack. Secondly, the inclination of the first side relative to the first direction and along the third direction causes the weight of the battery cell to act on adjacent battery cells within the same battery cell, which helps restrict the movement of the battery cell along the first direction, thereby reducing the amount of adhesive used between the battery cell and the casing along the first direction. The weight of the battery cell can be decomposed into a component force along the first side of the battery cell and a component force perpendicular to the first side of the battery cell. The component force perpendicular to the first side of the battery cell increases the friction between adjacent battery cells, which helps restrict the relative movement between adjacent battery cells within the same battery cell, thereby reducing the amount of adhesive used between adjacent battery cells and lowering the battery production cost. The amount of adhesive used between adjacent battery cells and between battery cells and the casing along the first direction can be reduced, which reduces the volume ratio of adhesive and helps to increase the volume ratio of battery cells in the casing, thereby helping to improve the energy density of the battery pack.

[0026] In one embodiment, the battery pack further includes:

[0027] A support beam is disposed within the accommodating cavity. The support beam is located at at least one end of the battery cell in the third direction. The support beam is fixed to the bottom wall of the housing to absorb the expansion of the battery cell in the third direction.

[0028] In this embodiment, the supporting beam is located at at least one end of the battery cell in the third direction, and the supporting beam is fixed to the bottom wall of the housing to improve the bending stiffness of the housing, which is beneficial to improving the overall strength of the battery pack. The supporting beam located at at least one end of the battery cell in the third direction can absorb the expansion of the battery cell in the third direction, which is beneficial to maintaining the stability between adjacent battery cells, and thus improving the safety performance of the battery pack.

[0029] In one embodiment, the supporting beam includes a first structural beam and a second structural beam. Both the first structural beam and the second structural beam are fixed to the bottom wall of the housing. The first structural beam and the second structural beam are respectively disposed at opposite ends of the accommodating cavity in the third direction, and the first structural beam and the second structural beam respectively abut against opposite sides of the battery unit in the third direction. The side of the first structural beam away from the bottom wall along the first direction abuts against the battery unit, and the side of the second structural beam facing the bottom wall along the first direction abuts against the battery unit.

[0030] In this embodiment, on the one hand, the first structural beam and the second structural beam abut against the opposite sides of the battery cell in the third direction, which helps to restrict the movement of the battery cell in the third direction. The first side of the battery cell is inclined in the third direction. The clamping force of the first structural beam and the second structural beam acting on the battery cell in the first direction helps to restrict the movement of adjacent battery cells in the first direction along the inclined direction. This makes the inclined first side beneficial to restrict the movement of adjacent battery cells in the first direction along the inclined direction, thereby reducing or even eliminating the amount of adhesive used between adjacent battery cells and between the battery cell and the housing in the first direction, which in turn helps to reduce the production cost of the battery pack. On the other hand, the amount of adhesive used between adjacent battery cells and between the battery cell and the housing in the first direction can be reduced, which reduces the volume ratio of adhesive, which helps to increase the volume ratio of the battery cell, and thus helps to increase the energy density of the battery pack.

[0031] In one embodiment, the first structural beam includes a first beam plate and a second beam plate, wherein the second beam plate is fixed to the bottom wall, the first beam plate abuts against the battery unit at one end in the third direction, and the included angle between the first beam plate and the second beam plate is an acute angle.

[0032] In this embodiment, the angle between the first beam plate and the second beam plate is an acute angle. The first beam plate abuts against the battery cell at one end in the third direction, allowing the first beam plate to also tilt in the third direction. The side of the first beam plate away from the bottom wall along the first direction abuts against the battery cell, and the first side is tilted towards the first beam plate in the third direction. On the one hand, this allows the first beam plate tilted in the third direction to guide the battery cells during the stacking process in the box, which is beneficial to improving the convenience of battery pack assembly. On the other hand, the first beam plate tilted in the third direction allows the corresponding battery cell to utilize the space above the first structural beam along the first direction, thereby increasing the volume of the battery cell in the box and improving the energy density of the battery pack.

[0033] In one embodiment, the first structural beam has a first reinforcing member, which is connected to the first beam plate and the second beam plate respectively.

[0034] In this embodiment, the first reinforcing member is connected to the first beam plate and the second beam plate respectively, which helps to restrict the rotation of the first beam plate relative to the second beam plate, so that the first reinforcing member can improve the strength of the first structural beam and improve the service life of the first structural beam.

[0035] In one embodiment, the battery pack further includes an electrical component, a thermal management component, and a delivery pipe, wherein the thermal management component is in communication with the delivery pipe, and the first structural beam has a first receiving cavity in which the electrical component and / or the delivery pipe are disposed.

[0036] In this embodiment, the first cavity of the first structural beam is used to accommodate electrical components and / or conveying pipes, so that the electrical components and conveying pipes do not encroach on the space of the battery cells, thereby improving the space utilization rate inside the box and improving the energy density of the battery pack.

[0037] In one embodiment, the second structural beam includes a third beam plate and a fourth beam plate, wherein the fourth beam plate is fixed to the bottom wall, the third beam plate abuts against the battery unit at one end in the third direction, and the included angle between the third beam plate and the fourth beam plate is an obtuse angle.

[0038] In this embodiment, the angle between the third beam plate and the fourth beam plate is an obtuse angle. The third beam plate abuts against the battery cell at one end in the third direction, allowing the third beam plate to also tilt in the third direction. The side of the third beam plate facing the bottom wall in the first direction abuts against the battery cell, and the first side is tilted in the third direction away from the third beam plate. On the one hand, the third beam plate tilting in the third direction can apply a force to the battery cells to make them stick together more tightly, which helps to restrict the movement of the battery cells in the third direction and the relative movement between adjacent battery cells. The clamping force of the plate acting on the battery cell along the first direction helps to restrict the movement of adjacent battery cells along the first direction, so that the inclined first side helps to restrict the movement of adjacent battery cells along the first direction, thereby helping to reduce or even eliminate the amount of adhesive used between adjacent battery cells and between the battery cell and the housing along the first direction; on the other hand, the third beam plate inclined along the third direction allows the corresponding battery cell to utilize the space below the second structural beam along the first direction to increase the volume of the battery cell in the housing, which helps to improve the energy density of the battery pack.

[0039] In one embodiment, the second structural beam has a second reinforcing member, which is connected to the third beam plate and the fourth beam plate respectively.

[0040] In this embodiment, the second reinforcing member is connected to the third beam plate and the fourth beam plate respectively, which helps to restrict the rotation of the third beam plate relative to the fourth beam plate, so that the second reinforcing member can improve the strength of the second structural beam and improve the service life of the second structural beam.

[0041] In one embodiment, the battery pack further includes electrical components, a thermal management component, and a delivery pipe. The thermal management component is connected to the delivery pipe. The second structural beam has a second receiving cavity, in which the electrical components and / or the delivery pipe are disposed.

[0042] In this embodiment, the second cavity of the second structural beam is used to accommodate electrical components and / or conveying pipes, so that the electrical components and conveying pipes do not encroach on the space of the battery cells, thereby improving the space utilization rate inside the box and improving the energy density of the battery pack.

[0043] In one embodiment, the battery pack further includes an electrical component, a thermal management component, and a delivery conduit. The thermal management component is in communication with the delivery conduit. The first structural beam has a first receiving cavity, the second structural beam has a second receiving cavity, the electrical component is located in one of the first receiving cavity and the second receiving cavity, and the delivery conduit is located in the other of the first receiving cavity and the second receiving cavity.

[0044] In this embodiment, the electrical component is located in one of the first receiving cavity and the second receiving cavity, and the delivery pipe is located in the other of the first receiving cavity and the second receiving cavity, such that the electrical component and the delivery pipe are respectively arranged on opposite sides in the third direction within the receiving cavity, so that the electrical component and the delivery pipe are spaced apart in the third direction, which helps to reduce the impact of the delivery pipe on the electrical component, and thus helps to improve the safety of the battery pack.

[0045] In one embodiment, along the third direction, each of the supporting beams is attached to the surface corresponding to the battery cell.

[0046] In this embodiment, each supporting beam is attached to the surface of the corresponding battery cell, making the contact between the supporting beam and the corresponding battery cell relatively tight. On the one hand, this helps to reduce the space loss between the supporting beam and the corresponding battery cell, which is beneficial to improving the energy density of the battery pack. On the other hand, it helps to increase the contact area between the supporting beam and the corresponding battery cell, as well as between adjacent battery cells, so as to improve the friction between the supporting beam and the corresponding battery cell, as well as between adjacent battery cells. With less adhesive used between adjacent battery cells, the overall assembly strength of the battery pack is also higher.

[0047] In one embodiment, along the third direction, two adjacent battery cells abut against each other, and the supporting beam abuts against the corresponding battery cell.

[0048] In this embodiment, adjacent battery cells abut against each other, and the supporting beam abuts against the corresponding battery cell. On the one hand, the supporting beams on opposite sides along the third direction can clamp the battery cells tightly, which is beneficial to improving the overall assembly strength of the battery pack. On the other hand, the first side of the battery cell is inclined along the third direction, and the component of the clamping force of the supporting beam acting on the battery cell along the first direction is beneficial to restricting the movement of adjacent battery cells along the first direction. This makes the inclined first side beneficial to restrict the movement of adjacent battery cells along the first direction, thereby reducing or even eliminating the amount of adhesive used between adjacent battery cells and between the battery cell and the housing along the first direction, thus reducing the production cost of the battery pack. When no adhesive is needed between adjacent battery cells, the battery cells can be directly assembled into battery units in the housing. This eliminates the need for a separate battery assembly equipment on the production line of the battery pack in this embodiment, which is beneficial to reducing the floor space and production steps of the battery pack production line, and thus reducing the production cost of the battery pack.

[0049] In one embodiment, the battery cell is a prismatic battery cell.

[0050] In this embodiment, the battery cell is a prismatic battery cell, which is beneficial to increasing the contact area between adjacent battery cells, thereby reducing the possibility of the battery cell moving along the second direction.

[0051] In one embodiment, the dimensions of the individual battery cell along the first direction range from 60 mm to 170 mm, and the dimensions of the battery pack along the first direction range from 78 mm to 269 mm.

[0052] In this embodiment, both the battery cell and the battery pack have relatively small dimensions along the first direction. The smaller dimensions of the battery pack along the first direction are beneficial for meeting the needs of electrical devices with strict size control along the first direction, such as the battery pack requirements of supercars, racing cars, and other vehicles.

[0053] In one embodiment, the dimensions of the battery pack along the first direction range from 55 mm to 329 mm.

[0054] In this embodiment, the battery pack has a smaller size along the first direction. A battery pack with a smaller size along the first direction is advantageous for meeting the needs of electrical devices with strict size control along the first direction, such as the battery pack requirements of supercars, racing cars, and other vehicles.

[0055] A second aspect of this application provides an electrical device, comprising:

[0056] The battery pack described in any of the foregoing embodiments;

[0057] The power-consuming body has a battery pack disposed thereon, which provides power to the power-consuming body.

[0058] A third aspect of this application provides an energy storage device, comprising:

[0059] The battery pack described in any of the foregoing embodiments is capable of storing electricity;

[0060] The battery pack is housed in the mounting box.

[0061] This application also provides a method for assembling a battery pack, including:

[0062] The first structural beam is installed into the receiving cavity of the box body to be fixed to the bottom wall of the box body;

[0063] Battery cells are placed into the accommodating cavity to form a battery unit. The first structural beam abuts against the battery unit on the side opposite to the bottom wall of the housing along a first direction, where the first direction is the height direction of the battery pack. The battery units are configured as one or more groups. When the battery units are configured as multiple groups, the multiple groups of battery units are arranged in a second direction. Each group of battery units includes at least two battery cells arranged along a third direction. The battery cells have opposing first and second end faces in the first direction, and the projections of the first and second end faces in the first direction are at least partially misaligned.

[0064] The second structural beam is installed into the receiving cavity of the box to be fixed to the bottom wall of the box, and the side of the second structural beam facing the bottom wall along the first direction abuts against the battery cell.

[0065] In this embodiment, battery cells are stacked sequentially in the housing along a third direction to form a battery unit. This eliminates the need for separate battery assembly equipment on the battery pack production line, reducing the floor space and production steps required, and consequently lowering production costs. The battery units abut against the first and second structural beams along the third direction, effectively restricting movement along the second direction. The projections of the first and second end faces in the first direction are at least partially offset, allowing the battery cells to tilt along the third direction. The clamping force exerted by the first and second structural beams on the battery units along the first direction further restricts movement of adjacent battery cells along the tilted direction. This tilted design further restricts the movement of adjacent battery cells along the tilted direction, reducing or eliminating the amount of adhesive used between adjacent battery cells and between the battery cells and the housing along the first direction, thus further reducing battery pack production costs.

[0066] Invention Effects

[0067] The battery pack provided in this application embodiment has the projections of the first and second end faces of the battery cells in a first direction at least partially offset, causing at least a portion of the side faces of the battery cells to be tilted relative to the first direction. This increases the distance from the first end face to the second end face of the battery cell, which, while keeping the height of the battery cells approximately the same, is beneficial for increasing the volume of a single battery cell. With the energy demand of the battery pack remaining approximately the same, the increased volume of a single battery cell helps reduce the number of battery cells, thus reducing the proportion of the battery cell's terminals and tabs within the battery pack housing. This is beneficial for increasing the volume ratio of the electrode assembly within the battery pack, and consequently, for increasing the energy density of the battery pack. Attached Figure Description

[0068] Figure 1This is an exploded view of a battery pack in one embodiment of this application;

[0069] Figure 2 This is a schematic diagram of the structure of a single battery cell in one embodiment of this application;

[0070] Figure 3 This is a schematic diagram of the orthographic projection of a single battery cell in one embodiment of this application;

[0071] Figure 4 This is a schematic diagram illustrating the positional relationship between the first region and the second region in one embodiment of this application;

[0072] Figure 5 This is a schematic diagram of the structure of the first structural beam in one embodiment of this application;

[0073] Figure 6 This is a schematic diagram of the second structural beam in one embodiment of this application;

[0074] Figure 7 This is a flowchart illustrating a battery pack assembly method according to one embodiment of this application.

[0075] Explanation of reference numerals in the attached figures

[0076] 1. Housing; 1a. Receiving cavity; 11. Bottom wall; 2. Battery unit; 21. Battery cell; 211. First end face; 211a. First region; 212. Second end face; 212a. Second region; 21a. Overlapping region; 213. First side; 214. Second side; 3. Bearing beam; 31. First structural beam; 31a. First receiving cavity; 311. First beam plate; 312. Second beam plate; 313. First reinforcing member; 32. Second structural beam; 32a. Second receiving cavity; 321. Third beam plate; 322. Fourth beam plate; 322a. Bolt hole; 323. Second reinforcing member. Detailed Implementation

[0077] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0078] 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 terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application; the terms “comprising” and “having” and any variations thereof in the embodiments of this application are intended to cover non-exclusive inclusion.

[0079] In the description of the embodiments of this application, technical terms such as "first," "second," and "third" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0080] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0081] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0082] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0083] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0084] In related technologies, the height direction of the housing is the first direction, and the projections of the first and second end faces of the battery cells in the first direction usually coincide, with the battery cells arranged roughly vertically. Because the battery cells are arranged roughly vertically, at approximately the same height, the distance from the first end face to the second end face of the battery cell is almost the shortest, resulting in a smaller volume for each battery cell. Therefore, with roughly the same energy demand for the battery pack, the number of battery cells in the pack is larger, and the corresponding terminals and electrode tabs of the battery cells occupy a larger space, reducing the usable space for the electrode components within the entire battery pack and resulting in a lower volumetric energy density.

[0085] Therefore, in the battery pack of this application embodiment, the projections of the first end face and the second end face of the battery cell in the first direction are at least partially misaligned, so that at least part of the side of the battery cell is tilted relative to the first direction, thereby increasing the space ratio of a single battery cell, which is beneficial to reducing the number of battery cells in the battery pack, reducing the space ratio of the battery cell's terminal post and the corresponding electrode assembly's tab, and thus beneficial to increasing the energy density of the battery pack.

[0086] The solutions in this application embodiment can be applied, but are not limited to, to battery packs, electrical devices including battery packs, or energy storage devices including battery packs.

[0087] This application provides an energy storage device, including a battery pack and a mounting box according to any embodiment. The battery pack is disposed in the mounting box and is capable of storing electricity.

[0088] Energy storage devices can be applied to, but are not limited to, energy storage containers, energy storage cabinets, etc.

[0089] This application provides an electrical device, including an electrical main body and a battery pack according to any embodiment. The battery pack is disposed on the electrical main body and provides power to the electrical main body.

[0090] Electrical devices can include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, and spacecraft. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, while spacecraft can include airplanes, rockets, space shuttles, and spacecraft.

[0091] In the following embodiments, for ease of explanation, a vehicle is used as an example to illustrate the electrical device according to one embodiment of this application. The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery pack is installed inside the vehicle, and the battery pack can be located at the bottom, front, or rear of the vehicle. The battery pack can be used to power the vehicle; for example, the battery pack can serve as the vehicle's operating power source. The vehicle's main electrical component includes a controller and a motor. The controller is used to control the battery to supply power to the motor, for example, to meet the power needs of the vehicle during starting, navigation, and driving.

[0092] In one embodiment of this application, the battery pack can not only serve as the operating power source for the vehicle, but also as the driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0093] For the battery pack of this application embodiment, please refer to [link / reference]. Figures 1-4 The battery pack includes a housing 1 and battery units 2. The housing 1 has an internal cavity 1a, and the height direction of the housing 1 is a first direction. The battery units 2 are disposed in the cavity 1a. The battery units 2 are configured as one or more groups. When the battery units 2 are configured as multiple groups, the multiple groups of battery units 2 are arranged in a second direction. Each group of battery units 2 includes at least two battery cells 21 arranged along a third direction. The battery cells 21 have opposing first end faces 211 and second end faces 212 in the first direction, and the projections of the first end faces 211 and the second end faces 212 in the first direction are at least partially misaligned.

[0094] The housing 1 refers to a structure with a storage space. The battery unit 2 is located in the housing 1, and the battery unit 2 of the battery pack is housed in the housing 1.

[0095] The number of battery cells 21 can be multiple, and these cells can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that some battery cells 21 are connected in series while others are connected in parallel. Multiple battery cells 21 can be directly connected in series, parallel, or in a mixed configuration, and then the assembly of these cells 21 is placed inside the housing 1. Alternatively, multiple battery cells 21 can first be connected in series, parallel, or in a mixed configuration to form a battery module, and then these battery modules can be connected in series, parallel, or in a mixed configuration to form a whole, which is then placed inside the housing 1. The battery pack may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 21.

[0096] The battery cell 21 can be a secondary battery, which is a structure that can be used again after being discharged by recharging to activate the active materials.

[0097] The battery cell 21 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0098] The battery cell 21 includes an inclined housing and an electrode assembly. The motor assembly includes positive and negative electrode plates and a separator. The housing can be a sealed structure or a non-sealed structure. As an example, the housing is a non-sealed structure, which serves to protect the electrode assembly. The battery cell 21 also includes a sealing bag located between the housing and the electrode assembly, which is used to encapsulate the electrode assembly. Specifically, the sealing bag can be a bag-shaped insulating material or an aluminum-plastic film.

[0099] For example, please refer to Figure 1 and Figure 2 The terminal post of the battery cell 21 is positioned above the outer casing along the first direction.

[0100] For example, Figures 1-3 The direction shown by R1 is the first direction. Figure 1 , Figure 2 and Figure 4 The direction shown by R2 is the second direction. Figures 1-4 The direction shown by R3 is the third direction.

[0101] It should be noted that the projections of the first end face 211 and the second end face 212 in the first direction are at least partially misaligned, and at least a portion of the side surface of the battery cell 21 is inclined relative to the first direction. The distance between at least a portion of the side surface of the battery cell 21 and the bottom wall 11 of the housing 1 gradually increases or decreases in the height direction. The distance from the first end face 211 to the second end face 212 of the battery cell 21 increases.

[0102] It should be noted that the distance from the first end face 211 to the second end face 212 on the side of the battery cell 21 is increased. Under the condition that the height of the battery cell 21 is roughly the same, it is beneficial to increase the volume of a single battery cell 21.

[0103] For example, please refer to Figure 3 , Figure 3 The dimension shown in S2 is the distance from the first end face 211 to the second end face 212 of a portion of the side of the battery cell 21, the dimension shown in S1 is the height of the battery cell 21, and S2 can be greater than or equal to S1.

[0104] For example, Figure 3 The included angle shown in R4 is the angle between at least a portion of the side surface of the battery cell 21 and the first direction.

[0105] For example, the material of the housing 1 is not limited, and can be aluminum or steel.

[0106] For example, the first direction, the second direction, and the third direction are arranged perpendicular to each other.

[0107] For example, please refer to Figure 1 The number of battery cells 2 is at least two groups, and the battery cells 2, which are at least two groups, are arranged sequentially along the second direction.

[0108] For example, please refer to Figure 1 There are six groups of battery cells 2, and the six groups of battery cells 2 are arranged sequentially along the second direction.

[0109] For example, please refer to Figure 1 and Figure 2 The second end face 212 of the battery cell 21 is located below the first end face 211 along the first direction. Multiple second end faces 212 are located in the same plane, which helps to improve the stability of the battery cell 21 in the housing 1.

[0110] For example, multiple second end faces 212 are located in different planes.

[0111] In this embodiment, the projections of the first end face 211 and the second end face 212 of the battery cell 21 in the first direction are at least partially misaligned, causing at least a portion of the side surface of the battery cell 21 to be tilted relative to the first direction. This increases the distance from the first end face 211 to the second end face 212 of the battery cell 21. With the height of the battery cell 21 remaining approximately the same, this increases the volume of a single battery cell 21. With the energy demand of the battery pack remaining approximately the same, the increased volume of a single battery cell 21 helps reduce the number of battery cells 21, thus reducing the proportion of the terminals and tabs of the battery cell 21 within the battery pack housing 1. This helps increase the volume ratio of the electrode assembly within the battery pack, thereby improving the energy density of the battery pack.

[0112] In one embodiment, please refer to Figure 1 , Figure 2 and Figure 3 The battery cell 21 has two first sides 213 opposite to each other in a third direction and two second sides 214 opposite to each other in a second direction, wherein the first sides 213 and the second sides 214 are connected to the first end face 211 and the second end face 212, and the two opposite first sides 213 are inclined relative to the first direction.

[0113] It should be noted that you should refer to [link / reference]. Figure 2The first side surface 213 and the second side surface 214 are connected to the first end surface 211 and the second end surface 212, meaning that the first side surface 213 is connected to the first end surface 211 and the second end surface 212 along the first direction, and the second side surface 214 is connected to the first end surface 211 and the second end surface 212 along the first direction.

[0114] It should be noted that you should refer to [link / reference]. Figure 1 , Figure 2 and Figure 3 Two opposing first side surfaces 213 are inclined relative to a first direction, and the distance between the first side surface 213 and the bottom wall 11 of the housing 1 gradually increases or decreases along a third direction. The first side surface 213 extends a large distance from the first end face 211 to the second end face 212, thereby increasing the volume of a single battery cell 21 at the same height and reducing the number of battery cells 21 in the battery pack.

[0115] In this embodiment, the side where two adjacent battery cells 21 in the same battery cell 2 abut against each other is a first side surface 213. The first side surface 213 is inclined relative to the first direction, so that the weight of the battery cell 21 acts on the adjacent battery cells 21 in the same battery cell 2, which helps to restrict the movement of the battery cell 21 along the first direction, and thus helps to reduce the amount of adhesive used between the battery cell 21 and the casing 1 along the first direction. The weight of the battery cell 21 can be decomposed into a component force along the first side surface 213 of the battery cell 21 and a component force perpendicular to the first side surface 213 of the battery cell 21. The component force perpendicular to the first side surface 213 of the battery cell 21 can increase the friction between adjacent battery cells 21, which helps to restrict the relative movement between adjacent battery cells 21 in the same battery cell 2, and thus helps to reduce the amount of adhesive used between adjacent battery cells 21, thereby reducing the production cost of the battery. The amount of adhesive used between adjacent battery cells 21 and between battery cells 21 and the housing 1 along the first direction can be reduced, which reduces the volume ratio of adhesive and helps to increase the volume ratio of battery cells 21 in the housing 1, thereby helping to increase the energy density of the battery pack.

[0116] It is understood that the side of the battery cell 21 is not limited to being tilted relative to the first direction. For example, two opposing second side surfaces 214 are tilted relative to the first direction.

[0117] In one embodiment, please refer to Figure 1 and Figure 2 The area of ​​the first side 213 is greater than the area of ​​the second side 214.

[0118] The areas of the first side 213 and the second side 214 can be calculated by measuring the corresponding dimensions with a vernier caliper and then using the area calculation formula.

[0119] For example, please refer to Figure 1 and Figure 2 The first side 213 is the surface with the largest area of ​​the battery cell 21.

[0120] For example, the electrode assembly of the battery cell 21 is formed in a wound manner, and the first side 213 is the surface of the corresponding battery cell 21 where the electrode assembly is flattened.

[0121] For example, the electrode assembly of the battery cell 21 is formed in the manner of electrode stacking, with the electrode stacked in a direction perpendicular to the first side 213.

[0122] In this embodiment, the area of ​​the first side 213 is larger than the area of ​​the second side 214, such that the larger first side 213 of the battery cell 21 is arranged sequentially along a third direction, and the first side 213 of the battery cell 21 faces the corresponding first side 213 of adjacent battery cells 21 in the same battery cell 2 along the third direction. The larger first side 213 of adjacent battery cells 21 in the same battery cell 2 are in contact with each other, which helps to increase the contact area between adjacent battery cells 21, and thus helps to reduce the possibility of two adjacent battery cells 21 moving along the second direction.

[0123] It is understood that the size relationship between the areas of the first side 213 and the second side 214 is not limited. For example, the area of ​​the first side 213 is smaller than the area of ​​the second side 214.

[0124] In one embodiment, please refer to Figures 1-3 The angle between the first side 213 and the first direction ranges from 0° to 90°.

[0125] It should be noted that the unit of angle is ° (degree), and the angle between the first side 213 and the first direction can be measured with an angle measuring instrument.

[0126] For example, Figure 3 The included angle shown in R4 is the included angle between the first side 213 of the battery cell 21 and the first direction.

[0127] For example, the angle between the first side 213 and the first direction can be 0°, 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80° or 90°.

[0128] In this embodiment, as the angle between the first side 213 and the first direction increases, the size of the battery cell 21 along the first direction decreases. The effect of part of the gravity of the battery cell 21 acting on adjacent battery cells 21 in the same battery unit 2 becomes more obvious, which is more conducive to restricting the movement of the battery cell 21 along the first direction. The component of the gravity of the battery cell 21 perpendicular to the first side 213 is also larger, which is also more conducive to restricting the relative movement between adjacent battery cells 21 in the same battery unit 2. This helps to reduce the amount of adhesive used between the battery cell 21 and the housing 1 along the first direction and between adjacent battery cells 21, thereby reducing the production cost of the battery pack.

[0129] In one embodiment, please refer to Figures 1-3 The angle between the first side 213 and the first direction is in the range of 30° to 60°.

[0130] In this embodiment of the application, the angle between the first side 213 and the first direction is limited to a reasonable range. In the case of some electrical devices that have size requirements in the first direction, it is beneficial to limit the size of the battery cell 21 in the first direction to a reasonable range, thereby limiting the size of the battery pack in the first direction to a reasonable range, which in turn helps to improve the overall strength of the battery pack.

[0131] In one embodiment, please refer to Figures 1-3 The angle between the first side 213 and the first direction is 45°.

[0132] In this embodiment of the application, the angle between the first side 213 and the first direction is limited to 45°. In the case of some electrical devices that have size requirements in the first direction, it is beneficial to reasonably limit the size of the battery cell 21 in the first direction, thereby reasonably limiting the size of the battery pack in the first direction, which in turn helps to improve the overall strength of the battery pack.

[0133] In one embodiment, please refer to Figures 1-4 The ratio of the area of ​​the first end face 211 and the second end face 212 that overlap in the first direction to the area of ​​the first end face 211 projected in the first direction is in the range of 0.3 to 0.6.

[0134] For example, the ratio of the area of ​​the first end face 211 and the second end face 212 that overlap in the first direction to the area of ​​the first end face 211 projected in the first direction can be 0.3, 0.4, 0.5 or 0.6.

[0135] For example, please refer to Figures 1-4 The area of ​​the first end face 211 can be equal to the area of ​​the second end face 212.

[0136] In this embodiment, the ratio of the area of ​​the first end face 211 and the second end face 212 that overlap in the first direction to the area of ​​the first end face 211 projected in the first direction is limited to a reasonable range. This also limits the angle between the first side face 213 and the first direction to a reasonable range. In cases where electrical devices have size requirements in the first direction, this helps to limit the size of the battery cell 21 in the first direction to a reasonable range, thereby limiting the size of the battery pack in the first direction to a reasonable range, which in turn helps to improve the overall strength of the battery pack.

[0137] It is understood that the ratio of the area of ​​the first end face 211 and the second end face 212 that overlaps in the first direction to the projected area of ​​the first end face 211 in the first direction is not limited. For example, the ratio of the area of ​​the first end face 211 and the second end face 212 that overlaps in the first direction to the projected area of ​​the first end face 211 in the first direction can be less than 0.3 or greater than 0.6.

[0138] In one embodiment, please refer to Figure 1 ~ and Figure 4 The ratio of the area of ​​the first end face 211 and the second end face 212 that overlap in the first direction to the area of ​​the first end face 211 projected in the first direction is 0.5.

[0139] In this embodiment, the ratio of the area of ​​the first end face 211 and the second end face 212 that overlap in the first direction to the area of ​​the first end face 211 projected in the first direction is limited to 0.5. This makes the angle between the first side face 213 and the first direction more reasonable. In the case of some electrical devices that have size requirements in the first direction, it is beneficial to limit the size of the battery cell 21 in the first direction more reasonably, thereby limiting the size of the battery pack in the first direction more reasonably, which in turn helps to improve the overall strength of the battery pack.

[0140] In one embodiment, please refer to Figures 1-4 The projection area of ​​the first end face 211 along the first direction is the first region 211a, and the projection area of ​​the second end face 212 along the first direction is the second region 212a. The first region 211a is at least partially located on one side of the second region 212a along the third direction, and the second region 212a is at least partially located on one side of the first region 211a along the third direction.

[0141] For example, please refer to Figure 4 The first region 211a and the second region 212a overlap to form a coincident region 21a. The first region 211a is partially located on one side of the coincident region 21a along the third direction, and the second region 212a is partially located on one side of the coincident region 21a along the third direction.

[0142] In this embodiment, the first region 211a is at least partially located on one side of the second region 212a along a third direction, and the second region 212a is at least partially located on one side of the first region 211a along a third direction. This causes the first side 213 of the battery cell 21 to be inclined relative to the first direction and along the third direction, allowing the battery cell 21 to reduce its size along the first direction, thereby facilitating a reduction in the height of the battery pack. Secondly, the inclined arrangement of the first side 213 relative to the first direction and along the third direction causes the weight of the battery cell 21 to act on adjacent battery cells 21 within the same battery cell 2, which helps to restrict the movement of the battery cell 21 along the first direction, thereby reducing the amount of adhesive used between the battery cell 21 and the housing 1 along the first direction. The gravity of the battery cell 21 can be decomposed into a component force along the first side surface 213 of the battery cell 21 and a component force perpendicular to the first side surface 213 of the battery cell 21. The component force perpendicular to the first side surface 213 of the battery cell 21 can increase the frictional force between adjacent battery cells 21, which helps to limit the relative movement between adjacent battery cells 21 in the same battery cell 2, thereby helping to reduce the amount of adhesive used between adjacent battery cells 21 and thus reducing the production cost of the battery. The amount of adhesive used between adjacent battery cells 21 and between the battery cell 21 and the housing 1 along the first direction can be reduced, resulting in a smaller volume ratio of adhesive, which helps to increase the volume ratio of the battery cell 21 in the housing 1, thereby helping to increase the energy density of the battery pack.

[0143] It is understandable that the positional relationship between the first region 211a and the second region 212a is not restricted.

[0144] For example, the area of ​​the first end face 211 is smaller than the area of ​​the second end face 212, and the first region 211a is located within the second region 212a.

[0145] For example, the first region 211a and the second region 212a are completely offset along a third direction.

[0146] In one embodiment, please refer to Figure 1 , Figure 5 and Figure 6 The battery pack also includes a support beam 3. The support beam 3 is disposed in the accommodating cavity 1a and is located at at least one end of the battery cell 2 in the third direction. The support beam 3 is fixed to the bottom wall 11 of the housing 1 to absorb the expansion of the battery cell 2 in the third direction.

[0147] For example, the material of the load-bearing beam 3 is not limited, and can be steel, aluminum or plastic.

[0148] For example, please refer to Figure 1There are two load-bearing beams 3, which are respectively arranged on opposite sides of the battery unit 2 along the third direction. Both load-bearing beams 3 extend continuously along the arrangement direction of the battery unit 2. The projection area of ​​the battery unit 2 along the third direction is located within the projection area of ​​the two load-bearing beams 3 along the third direction, so that the load-bearing beams 3 can improve the bending stiffness of the box 1.

[0149] In this embodiment, the supporting beam 3 is located at at least one end of the battery cell 2 in the third direction. The supporting beam 3 is fixed to the bottom wall 11 of the housing 1 to improve the bending stiffness of the housing 1, which is beneficial to improving the overall strength of the battery pack. The supporting beam 3 located at at least one end of the battery cell 2 in the third direction can absorb the expansion of the battery cell 2 in the third direction, which is beneficial to maintaining the stability between adjacent battery cells 21, and thus improving the safety performance of the battery pack.

[0150] It is understandable that the load-bearing beam 3 may not be provided inside the battery pack housing 1. Exemplarily, the battery cells 2 abut against the side walls of the housing 1 at opposite ends in a third direction.

[0151] In one embodiment, please refer to Figure 1 , Figure 5 and Figure 6 The supporting beam 3 includes a first structural beam 31 and a second structural beam 32. Both the first structural beam 31 and the second structural beam 32 are fixed to the bottom wall 11 of the housing 1. The first structural beam 31 and the second structural beam 32 are respectively located at opposite ends of the accommodating cavity 1a in a third direction. The first structural beam 31 and the second structural beam 32 respectively abut against opposite sides of the battery unit 2 in a third direction. The side of the first structural beam 31 away from the bottom wall 11 along the first direction abuts against the battery unit 2, and the side of the second structural beam 32 towards the bottom wall 11 along the first direction abuts against the battery unit 2.

[0152] In this embodiment, on the one hand, the first structural beam 31 and the second structural beam 32 respectively abut against the opposite sides of the battery cell 2 in the third direction, which helps to restrict the movement of the battery cell 2 in the third direction. The first side 213 of the battery cell 21 is inclined in the third direction. The clamping force of the first structural beam 31 and the second structural beam 32 acting on the battery cell 21 in the first direction helps to restrict the movement of adjacent battery cells 21 in the first direction along the inclined direction. This makes the inclined first side 213 helpful in restricting the movement of adjacent battery cells 21 in the first direction along the inclined direction, thereby helping to reduce or even eliminate the amount of adhesive used between adjacent battery cells 21 and between the battery cell 21 and the housing 1 in the first direction, which in turn helps to reduce the production cost of the battery pack. On the other hand, the amount of adhesive used between adjacent battery cells 21 and between the battery cell 21 and the housing 1 in the first direction can be reduced, which reduces the volume ratio of adhesive, which helps to increase the volume ratio of the battery cell 21, and thus helps to increase the energy density of the battery pack.

[0153] It is understood that the positional relationship between the first structural beam 31 and the second structural beam 32 is not limited. For example, the first structural beam 31 and the second structural beam 32 are located on the same side of the battery cell 2 along a third direction.

[0154] In one embodiment, please refer to Figure 1 and Figure 5 The first structural beam 31 includes a first beam plate 311 and a second beam plate 312, wherein the second beam plate 312 is fixed to the bottom wall 11, the first beam plate 311 abuts against the battery unit 2 at one end in a third direction, and the included angle between the first beam plate 311 and the second beam plate 312 is an acute angle.

[0155] For example, please refer to Figure 1 and Figure 5 The first side 213 is inclined toward the first beam plate 311 in a third direction, and the first beam plate 311 is in contact with the corresponding battery cell 21.

[0156] For example, the second beam plate 312 is fixedly connected to the bottom bolt.

[0157] In this embodiment, the angle between the first beam plate 311 and the second beam plate 312 is an acute angle. The first beam plate 311 abuts against the battery unit 2 at one end in the third direction, allowing the first beam plate 311 to also tilt in the third direction. The side of the first beam plate 311 away from the bottom wall 11 along the first direction abuts against the battery unit 2, and the first side 213 tilts towards the first beam plate 311 in the third direction. On the one hand, during the stacking of the battery cells 21 in the housing 1, the first beam plate 311 tilted in the third direction can guide the battery cells 21, which is beneficial to improving the convenience of battery pack assembly. On the other hand, the first beam plate 311 tilted in the third direction allows the corresponding battery cells 21 to utilize the space above the first structural beam 31 along the first direction, thereby increasing the volume of the battery unit 2 in the housing 1 and improving the energy density of the battery pack.

[0158] It is understood that the arrangement of the first beam 311 and the second beam 312 is not limited. For example, the first beam 311 and the second beam 312 are arranged perpendicularly.

[0159] In one embodiment, please refer to Figure 1 and Figure 5 The first structural beam 31 has a first reinforcing member 313, which is connected to the first beam plate 311 and the second beam plate 312 respectively.

[0160] For example, the number of first reinforcing members 313 is not limited, and can be one, two or three.

[0161] For example, please refer to Figure 1 and Figure 5 The number of first reinforcing members 313 is three, and the three first reinforcing members 313 are spaced apart along the second direction.

[0162] In this embodiment, the first reinforcing member 313 is connected to the first beam plate 311 and the second beam plate 312 respectively, which helps to restrict the rotation of the first beam plate 311 relative to the second beam plate 312, so that the first reinforcing member 313 can improve the strength of the first structural beam 31 and improve the service life of the first structural beam 31.

[0163] It is understood that the first structural beam 31 may not be provided with the first reinforcing member 313. Exemplarily, the first structural beam 31 includes a first beam plate 311 and a second beam plate 312 arranged intersecting each other.

[0164] In one embodiment, please refer to Figure 1 and Figure 5 The battery pack also includes electrical components, thermal management components and delivery pipes. The thermal management components are connected to the delivery pipes. The first structural beam 31 has a first receiving cavity 31a, in which electrical components and / or delivery pipes are disposed.

[0165] For example, the thermal management component is used to regulate the temperature of the battery cell 21.

[0166] For example, the thermal management component is located between the battery cell 21 and the bottom wall 11 along the first direction, and one end of the thermal management component along the first direction is in contact with the second end face 212.

[0167] For example, the thermal management component can be a water cooling device, which is located between the battery cell 21 and the bottom wall 11 along the first direction. One end of the water cooling device along the first direction is in contact with the second end face 212. The water cooling device is connected to a conveying pipe, and condensate enters and exits the water cooling device through the conveying pipe to regulate the temperature of the battery cell 21, which is beneficial to improving the heat dissipation efficiency of the battery cell 21 under normal operating conditions.

[0168] For example, the second end face 212 is located in the same plane. The second end face 212 located in the same plane increases the contact area between the surface of the battery cell 2 near the bottom wall 11 along the first direction and the water cooling device, thereby improving the heat dissipation efficiency of the battery cell 2 under normal working conditions.

[0169] It should be noted that the electrical components and / or conveying pipes are provided in the first receiving cavity 31a, which means that electrical components and / or conveying pipes may also be provided in other locations inside the battery pack housing 1, or there may be no electrical components and / or conveying pipes.

[0170] For example, an electrical component is disposed within the first receiving cavity 31a.

[0171] For example, an electrical component and a delivery pipe are disposed in the first receiving cavity 31a.

[0172] For example, the connection method between the electrical components and / or delivery pipes disposed in the first receiving cavity 31a and the first structural beam 31 is not limited.

[0173] For example, the first structural beam 31 may include a beam body and an inlay structure, the beam body and the inlay structure being integrally injection molded, and electrical components and / or delivery pipes being integrated into the inlay structure.

[0174] For example, electrical components can serve as the control assembly for the battery pack, regulating the battery pack under normal operating conditions.

[0175] In this embodiment, the first receiving cavity 31a of the first structural beam 31 is used to accommodate electrical components and / or conveying pipes, so that the electrical components and conveying pipes do not occupy the space of the battery cell 21, thereby improving the space utilization rate inside the box 1 and improving the energy density of the battery pack.

[0176] It is understandable that the battery pack may not include thermal management components, and the individual battery cells 21 can dissipate heat naturally under normal operating conditions.

[0177] It is understood that the location of the electrical components and the delivery pipes is not limited. For example, both the electrical components and the delivery pipes are located inside the housing 1, and both are disposed outside the first receiving cavity 31a.

[0178] In one embodiment, please refer to Figure 1 and Figure 6 The second structural beam 32 includes a third beam plate 321 and a fourth beam plate 322. The fourth beam plate 322 is fixed to the bottom wall 11, and the third beam plate 321 abuts against the battery unit 2 at one end in the third direction. The included angle between the third beam plate 321 and the fourth beam plate 322 is an obtuse angle.

[0179] For example, please refer to Figure 1 and Figure 6 The first side 213 is inclined in a direction away from the third beam plate 321 along the third direction, and the third beam plate 321 is attached to the corresponding battery cell 21.

[0180] For example, please refer to Figure 1 and Figure 6 The fourth beam plate 322 has bolt holes 322a, and the fourth beam plate 322 is fixedly connected to the bottom wall 11 by bolts through the bolt holes 322a.

[0181] In this embodiment, the angle between the third beam plate 321 and the fourth beam plate 322 is an obtuse angle. The third beam plate 321 abuts against the battery unit 2 at one end in the third direction, allowing the third beam plate 321 to also tilt in the third direction. The side of the third beam plate 321 facing the bottom wall 11 in the first direction abuts against the battery unit 2, and the first side 213 tilts in the third direction away from the third beam plate 321. On the one hand, the third beam plate 321 tilting in the third direction can apply a force to the battery cells 21 to make them stick together more tightly, which helps to restrict the movement of the battery unit 2 in the third direction and the relative movement between adjacent battery cells 21. The clamping force of the third beam plate 321 acting on the battery cell 21 along the first direction is beneficial to restricting the movement of adjacent battery cells 21 along the first direction. This makes the inclined first side 213 beneficial to restrict the movement of adjacent battery cells 21 along the first direction, thereby reducing or even eliminating the amount of adhesive used between adjacent battery cells 21 and between the battery cell 21 and the housing 1 along the first direction. On the other hand, the third beam plate 321 inclined along the third direction allows the corresponding battery cell 21 to utilize the space below the second structural beam 32 along the first direction to increase the volume of the battery unit 2 in the housing 1, which is beneficial to improving the energy density of the battery pack.

[0182] It is understood that the arrangement of the third beam 321 and the fourth beam 322 is not limited. For example, the third beam 321 and the fourth beam 322 are arranged perpendicularly.

[0183] In one embodiment, please refer to Figure 1 and Figure 6 The second structural beam 32 has a second reinforcing member 323, which is connected to the third beam plate 321 and the fourth beam plate 322 respectively.

[0184] For example, the number of second reinforcing members 323 is not limited, and can be one, two or three.

[0185] For example, please refer to Figure 1 and Figure 6 The number of second reinforcing members 323 is three, and the three second reinforcing members 323 are spaced apart along the second direction.

[0186] In this embodiment, the second reinforcing member 323 is connected to the third beam plate 321 and the fourth beam plate 322 respectively, which helps to restrict the rotation of the third beam plate 321 relative to the fourth beam plate 322, so that the second reinforcing member 323 can improve the strength of the second structural beam 32 and improve the service life of the second structural beam 32.

[0187] It is understood that the second structural beam 32 may also omit the second reinforcing member 323. Exemplarily, the second structural beam 32 includes a third beam plate 321 and a fourth beam plate 322 arranged intersecting each other.

[0188] In one embodiment, please refer to Figure 1 and Figure 6 The battery pack also includes electrical components, a thermal management component temperature control device, and a delivery pipeline. The thermal management component temperature control device is connected to the delivery pipeline. The second structural beam 32 has a second receiving cavity 32a, in which electrical components and / or delivery pipelines are disposed.

[0189] It should be noted that the provision of electrical components and / or conveying pipes in the second receiving cavity 32a means that electrical components and / or conveying pipes may also be provided in other locations within the battery pack housing 1, except for the second receiving cavity 32a, or there may be no electrical components and / or conveying pipes.

[0190] For example, an electrical component is disposed within the second receiving cavity 32a.

[0191] For example, the second receiving cavity 32a is provided with electrical components and delivery pipes.

[0192] For example, the connection method between the electrical components and / or delivery pipes disposed in the second receiving cavity 32a and the second structural beam 32 is not limited.

[0193] For example, the second structural beam 32 may include a beam body and an inlay structure, which are integrally injection molded, and electrical components and / or delivery pipes are integrated into the inlay structure.

[0194] In this embodiment, the second receiving cavity 32a of the second structural beam 32 is used to accommodate electrical components and / or conveying pipes, so that the electrical components and conveying pipes do not occupy the space of the battery cell 21, thereby improving the space utilization rate inside the box 1 and improving the energy density of the battery pack.

[0195] It is understood that the location of the electrical components and the delivery pipes is not limited. For example, both the electrical components and the delivery pipes are located inside the housing 1, and both are disposed outside the second receiving cavity 32a.

[0196] In one embodiment, please refer to Figure 1 , Figure 5 and Figure 6 The battery pack also includes electrical components, thermal management components, and delivery pipes. The thermal management components are connected to the delivery pipes. The first structural beam 31 has a first receiving cavity 31a, and the second structural beam 32 has a second receiving cavity 32a. The electrical components are located in one of the first receiving cavity 31a and the second receiving cavity 32a, and the delivery pipes are located in the other of the first receiving cavity 31a and the second receiving cavity 32a.

[0197] For example, the electrical components are located in the first receiving cavity 31a, and the delivery pipe is located in the second receiving cavity 32a.

[0198] In this embodiment, the electrical component is located in one of the first receiving cavity 31a and the second receiving cavity 32a, and the delivery pipe is located in the other of the first receiving cavity 31a and the second receiving cavity 32a, so that the electrical component and the delivery pipe are respectively arranged on opposite sides in the third direction within the receiving cavity 1a, so that the electrical component and the delivery pipe are spaced apart in the third direction, which helps to reduce the impact of the delivery pipe on the electrical component, and thus helps to improve the safety of the battery pack.

[0199] It is understood that the location of the electrical components and the conveying pipes is not limited. For example, both the electrical components and the conveying pipes are located inside the housing 1, and both are disposed outside the first receiving cavity 31a and the second receiving cavity 32a.

[0200] In one embodiment, please refer to Figures 1-6 Along the third direction, each side of the load-bearing beam 3 is attached to the surface corresponding to the battery cell 21.

[0201] For example, please refer to Figure 1 Each side of the load-bearing beam 3 is attached to the first side 213 corresponding to the battery cell 21.

[0202] In this embodiment, each side of the supporting beam 3 is attached to the surface of the corresponding battery cell 21, making the contact between the supporting beam 3 and the corresponding battery cell 21 relatively tight. On the one hand, this helps to reduce the space loss between the supporting beam 3 and the corresponding battery cell 21, which is beneficial to improving the energy density of the battery pack. On the other hand, it helps to increase the contact area between the supporting beam 3 and the corresponding battery cell 21 and between adjacent battery cells 21, thereby increasing the friction between the supporting beam 3 and the corresponding battery cell 21 and between adjacent battery cells 21. With less adhesive used between adjacent battery cells 21, the overall assembly strength of the battery pack is also higher.

[0203] It is understood that the contact relationship between each side of the supporting beam 3 and the surface corresponding to the corresponding battery cell 21 is not limited. For example, each side of the supporting beam 3 is partially attached to the surface corresponding to the corresponding battery cell 21.

[0204] In one embodiment, please refer to Figures 1-6 Along the third direction, two adjacent battery cells 21 abut against each other, and the load-bearing beam 3 abuts against the corresponding battery cell 21.

[0205] For example, please refer to Figure 1 The first side 213 of two adjacent battery cells 21 abuts against each other, and the supporting beam 3 abuts against the first side 213 of the corresponding battery cell 21.

[0206] In this embodiment, two adjacent battery cells 21 abut against each other, and the supporting beam 3 abuts against the corresponding battery cell 21. On the one hand, the supporting beams 3 on opposite sides along the third direction can clamp the battery cell 2 more tightly, which is beneficial to improving the overall assembly strength of the battery pack. On the other hand, the first side 213 of the battery cell 21 is inclined along the third direction. The component of the clamping force of the supporting beam 3 on the battery cell 21 along the first direction is beneficial to restricting the movement of adjacent battery cells 21 along the first direction. This makes the inclined first side 213 beneficial to restrict the movement of adjacent battery cells 21 along the first direction, thereby reducing or even eliminating the amount of adhesive used between adjacent battery cells 21 and between the battery cell 21 and the housing 1 along the first direction, so as to reduce the production cost of the battery pack. When no adhesive is needed between adjacent battery cells 21, the battery cells 21 can be directly assembled into battery cells 2 in the housing 1. This means that the battery pack production line of this embodiment does not need to be equipped with a separate battery assembly equipment, which is beneficial to reducing the floor space and production steps of the battery pack production line, and thus reducing the production cost of the battery pack.

[0207] It is understood that the contact relationship between two adjacent battery cells 21 and between the supporting beam 3 and the corresponding battery cell 21 is not limited. For example, there may be a gap between two adjacent battery cells 21, and there may be a gap between the supporting beam 3 and the corresponding battery cell 21.

[0208] In one embodiment, please refer to Figures 1-3 The battery cell 21 is a prismatic battery cell 21.

[0209] For example, please refer to Figure 2 The battery cell 21 has a roughly hexahedral structure and the cross-sectional shape of the battery cell 21 is roughly an inclined quadrilateral.

[0210] For example, the cross-sectional shape of the battery cell 21 is a parallelogram.

[0211] In this embodiment, the battery cell 21 is a prismatic battery cell 21, which is beneficial to increase the contact area between adjacent battery cells 21, thereby reducing the possibility of the battery cell 21 moving along the second direction.

[0212] It is understood that the shape of the battery cell 21 is not limited. For example, the shape of the battery cell 21 can also be an inclined cylinder.

[0213] In one embodiment, the dimensions of the battery cell 21 along the first direction range from 60 mm to 170 mm, and the dimensions of the battery pack along the first direction range from 78 mm to 269 mm.

[0214] The dimensions of a single battery cell 21 or a battery pack can be measured using vernier calipers.

[0215] For example, when the angle between the first side 213 and the first direction is 45°, the size of the battery cell 21 along the first direction can be in the range of 60 mm to 170 mm, and the size of the battery pack along the first direction can be in the range of 78 mm to 269 mm.

[0216] For example, the dimensions of the battery cell 21 along the first direction can be 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, 110 mm, 120 mm, 130 mm, 140 mm, 150 mm, 160 mm, or 170 mm.

[0217] For example, the dimensions of the battery pack along the first direction can be 78 mm, 100 mm, 120 mm, 140 mm, 160 mm, 180 mm, 200 mm, 220 mm, 240 mm, 260 mm, or 269 mm.

[0218] It should be noted that the height of the rectangular cross-section battery cell 21 is generally 85 mm to 240 mm, and the height of its battery pack is generally 110 mm to 380 mm.

[0219] It should be noted that some electrical devices, such as electric supercars and electric racing cars, have significant limitations on chassis height, which makes the size requirements of the battery pack along the first direction relatively high, and consequently, the size of the battery pack along the first direction required for electric supercars and electric racing cars is relatively small.

[0220] In this embodiment, both the battery cell 21 and the battery pack have relatively small dimensions along the first direction. The smaller dimensions of the battery pack along the first direction are beneficial for meeting the needs of electrical devices with strict size control along the first direction, such as the battery pack requirements of supercars, racing cars, and other vehicles.

[0221] It is understood that the dimensions of the battery cell 21 along the first direction and the dimensions of the battery pack along the first direction are not limited. For example, the dimension of the battery cell 21 along the first direction can be less than 60 mm or greater than 170 mm, and the dimension of the battery pack along the first direction can be less than 78 mm or greater than 269 mm.

[0222] In one embodiment, the dimensions of the battery pack along the first direction range from 55 mm to 329 mm.

[0223] For example, when the angle between the first side 213 and the first direction is greater than 45°, the size of the battery pack along the first direction can range from 55 mm to 329 mm.

[0224] In this embodiment, the battery pack has a smaller size along the first direction. A battery pack with a smaller size along the first direction is advantageous for meeting the needs of electrical devices with strict size control along the first direction, such as the battery pack requirements of supercars, racing cars, and other vehicles.

[0225] It is understood that the dimensions of the battery pack along the first direction are not limited. For example, the dimensions of the battery pack along the first direction can be less than 55 mm or greater than 329 mm.

[0226] This application also provides a method for assembling a battery pack. Please refer to [link to relevant documentation]. Figure 7 ,include:

[0227] S1. Install the first structural beam into the receiving cavity of the box body to fix it to the bottom wall of the box body;

[0228] S2. The battery cells are placed into the accommodating cavity to form a battery unit. The first structural beam abuts against the battery unit on the side away from the bottom wall of the box along the first direction. The first direction is the height direction of the battery pack. The battery units are set as one or more groups. When the battery units are set as multiple groups, the multiple groups of battery units are arranged in the second direction. Each group of battery units includes at least two battery cells arranged along the third direction. The battery cells have opposite first end faces and second end faces in the first direction. The projections of the first end faces and the second end faces in the first direction are at least partially misaligned.

[0229] S3. Install the second structural beam into the receiving cavity of the box to fix it to the bottom wall of the box. The side of the second structural beam facing the bottom wall in the first direction abuts against the battery unit.

[0230] In this embodiment, battery cells 21 are stacked sequentially in the housing 1 along a third direction to form battery units 2. This eliminates the need for separate battery assembly equipment on the battery pack production line, reducing the floor space and production steps required for the battery pack production line, thereby lowering the production cost. Battery units 2 abut against the first structural beam 31 and the second structural beam 32 along the third direction, which helps restrict movement of battery units 2 along the second direction. The projections of the first end face 211 and the second end face 212 in the first direction are at least partially misaligned, allowing battery cells 21 to tilt along the third direction. The clamping force of the first structural beam 31 and the second structural beam 32 acting on the battery unit 2 along the first direction helps restrict movement of adjacent battery cells 21 along the tilted direction. This tilted battery cells further restrict movement of adjacent battery cells 21 along the tilted direction, reducing or even eliminating the amount of adhesive used between adjacent battery cells 21 and between battery cells 21 and the housing 1 along the first direction, thus lowering the production cost of the battery pack.

[0231] For the battery pack of this application embodiment, please refer to [link / reference]. Figures 1 to 7 The projections of the first end face 211 and the second end face 212 of the battery cell 21 in the first direction are at least partially misaligned, so that the side of the battery cell 21 is inclined relative to the first direction. This helps to reduce the height of the battery pack, which in turn helps to meet the needs of electrical devices with strict size control along the first direction. It also helps to increase the energy density of the battery pack, and also helps to reduce the amount of adhesive used between the battery cell 21 and the housing 1 along the first direction and between adjacent battery cells 21, which in turn helps to reduce the production cost of the battery pack.

[0232] The angle between the first side surface 213 and the first direction can range from 0° to 90°, from 30° to 60°, or even 45°. When the angle between the first side surface 213 and the first direction is 45°, the size of the battery cell 21 along the first direction can range from 60 mm to 170 mm, and the size of the battery pack along the first direction can range from 78 mm to 269 mm. When the angle between the first side surface 213 and the first direction is greater than 45°, the size of the battery pack along the first direction can range from 55 mm to 329 mm. As the angle between the first side surface 213 and the first direction increases, the size of the battery cell 21 along the first direction decreases, which helps to limit the movement of the battery cell 21 along the first direction and also helps to reduce the amount of adhesive used between the battery cell 21 and the housing 1 and between adjacent battery cells 21 along the first direction. The ratio of the area of ​​the overlapping projections of the first end face 211 and the second end face 212 in the first direction to the projected area of ​​the first end face 211 in the first direction can range from 0.3 to 0.6, or even 0.5.

[0233] Battery cells 21 are stacked sequentially in the housing 1 along a third direction to form battery units 2. Supporting beams 3 are provided on opposite sides of each battery unit 2 along the third direction to hold the battery unit 2 between the supporting beams 3.

[0234] The battery cell 21, which is inclined along the third direction on the first side 213, can increase the friction between adjacent battery cells 21 by relying on its own weight and the clamping force of the first beam plate 311 and the third beam plate 321 located on opposite sides along the third direction in the accommodating cavity 1a. This makes it easier to restrict the movement of the battery cell 21 along the first direction and the relative movement between adjacent battery cells 21. In turn, it can reduce or even eliminate the adhesive between adjacent battery cells 21 and between the battery cell 21 and the housing 1 along the first direction, which is beneficial to reducing the production cost of the battery pack.

[0235] Along the first direction, a thermal management component is provided between the battery cell 21 and the bottom wall 11, which helps to improve the heat dissipation efficiency of the battery cell 21 under normal operating conditions.

[0236] The first structural beam 31 and the second structural beam 32, located on opposite sides along a third direction within the accommodating cavity 1a, each have a first accommodating cavity 31a and a second accommodating cavity 32a, respectively. Both accommodating cavities 31a and 32a are used to accommodate electrical components and / or delivery pipes to improve the space utilization of the battery. The supporting beam 3 is connected to the bottom wall 11, which can improve the overall strength of the battery pack. The first structural beam 31 can guide the stacking of battery cells 21, and the second structural beam 32 can provide a clamping force for the assembly of battery cells 21 to improve the assembly strength of the battery pack. The first structural beam 31 has a first reinforcing member 313, which helps to improve the strength and service life of the first structural beam 31, and the second structural beam 32 has a second reinforcing member 323, which helps to improve the strength and service life of the second structural beam 32.

[0237] The above description is merely a preferred embodiment of this application and is not intended to limit the application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A battery pack, characterized by, The battery pack comprises: a box body, which is internally provided with a containing cavity, and the height direction of the box body is a first direction; a battery unit arranged in the containing cavity, the battery unit is arranged in one or more groups, in the case of being arranged in multiple groups, the multiple groups of battery units are arranged in a second direction; each group of battery units comprises at least two battery monomers arranged in a third direction; wherein the battery monomer has opposite first and second end faces in the first direction, and the projections of the first and second end faces in the first direction are at least partially misaligned.

2. The battery pack of claim 1, wherein, The battery monomer has two first sides opposite in the third direction and two second sides opposite in the second direction, wherein the first and second sides connect the first and second end faces, and the two opposite first sides are arranged obliquely relative to the first direction.

3. The battery pack of claim 2, wherein, The area of the first side is greater than the area of the second side.

4. The battery pack of claim 2, wherein, The angle between the first side and the first direction ranges from 0° to 90°.

5. The battery pack of claim 2, wherein, The angle between the first side and the first direction ranges from 30° to 60°.

6. The battery pack of claim 2, wherein, The angle between the first side and the first direction is 45°.

7. The battery pack of claim 1, wherein, The ratio of the area of the projection of the first and second end faces in the first direction to the projection area of the first end face in the first direction ranges from 0.3 to 0.

6.

8. The battery pack of claim 1, wherein, The ratio of the area of the projection of the first and second end faces in the first direction to the projection area of the first end face in the first direction is 0.

5.

9. The battery pack of any one of claims 1-8, wherein, The projection area of the first end face in the first direction is a first area, the projection area of the second end face in the first direction is a second area, the first area is at least partially located on one side of the second area along the third direction, and the second area is at least partially located on one side of the first area along the third direction.

10. The battery pack of any one of claims 1-8, wherein, The battery pack further comprises: a bearing beam arranged in the containing cavity, the bearing beam is located at least one end of the battery unit in the third direction, and the bearing beam is fixed with the bottom wall of the box body to absorb the expansion of the battery unit in the third direction.

11. The battery pack of claim 10, wherein, The bearing beam comprises a first structural beam and a second structural beam, both of which are fixed with the bottom wall of the box body, the first and second structural beams are arranged at opposite ends of the containing cavity in the third direction respectively, and the first and second structural beams abut the battery unit on opposite sides of the battery unit in the third direction respectively, the first structural beam abuts the battery unit on the side away from the bottom wall along the first direction, and the second structural beam abuts the battery unit on the side towards the bottom wall along the first direction.

12. The battery pack of claim 11, wherein, The first structural beam comprises a first beam plate and a second beam plate, wherein the second beam plate is fixed with the bottom wall, the first beam plate abuts one end of the battery unit in the third direction, and the included angle between the first beam plate and the second beam plate is an acute angle.

13. The battery pack of claim 12, wherein, The first structural beam has a first reinforcing member connected with the first beam plate and the second beam plate respectively.

14. The battery pack of claim 11, wherein, The battery pack further comprises an electrical component, a thermal management component and a conveying pipeline, the thermal management component is in communication with the conveying pipeline, the first structural beam has a first accommodating cavity, and the electrical component and / or the conveying pipeline are arranged in the first accommodating cavity.

15. The battery pack of claim 11, wherein, The second structural beam comprises a third beam plate and a fourth beam plate, the fourth beam plate is fixed with the bottom wall, the third beam plate is in abutment with one end of the battery cell in the third direction, and the included angle between the third beam plate and the fourth beam plate is obtuse.

16. The battery pack of claim 15, wherein, The second structural beam has a second reinforcing member connected with the third beam plate and the fourth beam plate respectively.

17. The battery pack of claim 11, wherein, The battery pack further comprises an electrical component, a thermal management component and a conveying pipeline, the thermal management component is in communication with the conveying pipeline, the second structural beam has a second accommodating cavity, and the electrical component and / or the conveying pipeline are arranged in the second accommodating cavity.

18. The battery pack of claim 11, wherein, The battery pack further comprises an electrical component, a thermal management component and a conveying pipeline, the thermal management component is in communication with the conveying pipeline, the first structural beam has a first accommodating cavity, the second structural beam has a second accommodating cavity, the electrical component is arranged in one of the first accommodating cavity and the second accommodating cavity, and the conveying pipeline is arranged in the other one of the first accommodating cavity and the second accommodating cavity.

19. The battery pack of claim 10, wherein, Along the third direction, each side of the bearing beam is fitted with the surface of the corresponding battery monomer.

20. The battery pack of claim 10, wherein, Along the third direction, two adjacent battery monomers are in abutment with each other, and the bearing beam is in abutment with the corresponding battery monomer.

21. The battery pack of any one of claims 1-8, wherein, The battery monomer is a square shell battery monomer.

22. The battery pack of any one of claims 1-8, wherein, The size of the battery monomer in the first direction ranges from 60 mm to 170 mm, and the size of the battery pack in the first direction ranges from 78 mm to 269 mm.

23. The battery pack of any one of claims 1-8, wherein, The size of the battery pack in the first direction ranges from 55 mm to 329 mm.

24. An electrical device, comprising: Comprising: The battery pack according to any one of claims 1-23; The battery pack is arranged in the power consumption body, and provides power for the power consumption body.

25. An energy storage device, comprising: Comprising: The battery pack according to any one of claims 1-23, which can store power; The battery pack is arranged in the mounting box.

26. A method of assembling a battery pack, the method comprising: Comprising: The first structural beam is installed into the accommodating cavity of the box body to be fixed with the bottom wall of the box body; The battery monomer is placed into the accommodating cavity to constitute a battery cell, the first structural beam is in abutment with the battery cell on the side of the first direction away from the bottom wall of the box body, the first direction is the height direction of the battery pack, the battery cell is arranged in one or more groups, in the case of multiple groups, the multiple groups of battery cells are arranged in the second direction; each group of battery cells comprises at least two battery monomers arranged in the third direction, the battery monomer has opposite first and second end faces in the first direction, and the projections of the first and second end faces in the first direction are at least partially misaligned. A second structural beam is installed into a receiving cavity of the case to be fixed with a bottom wall of the case, and a side of the second structural beam facing the bottom wall in the first direction abuts against the battery cell.

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