Battery device and energy storage equipment with same

Abstract

The utility model discloses a battery device and energy storage equipment with the same, and the battery device comprises a box body and at least one battery assembly. The box body is provided with a containing cavity and has a first direction. The battery assembly is arranged in the containing cavity and comprises a plurality of battery cells and at least one first restraining part, the battery cells are arranged in the first direction, the first restraining part provides restraining force in multiple directions for the battery cells, and the direction of at least one restraining force in the restraining force in the multiple directions is parallel to the first direction. When the battery cell expands, the first restraining piece can disperse the outward pressure of the battery cell, so that the restraining effect on the battery device is enhanced, the expansion of the battery cell is reduced, further the expansion of the battery device can be reduced, the use safety of the battery device is ensured, and the service life of the battery device is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of battery devices, in particular to a battery device and an energy storage device having the same. Background Art

[0002] In the prior art, battery devices use square shell cells, which makes the production of battery devices complicated, the production cost is high, and the energy density is low. However, during the use of the battery device, the square shell cells will undergo chemical reactions to produce gas, which can easily increase the pressure inside the square shell cells, causing the square shell cells to swell more seriously, thereby causing the battery device to swell, which will reduce the safety of the battery device. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a battery device that enhances the restraint effect on the battery device and reduces the swelling of the battery core, thereby reducing the swelling of the battery device, ensuring the safety of the battery device and increasing the service life of the battery device.

[0004] Another object of the present invention is to provide an energy storage device using the above battery device.

[0005] According to the first aspect of the utility model, the battery device includes: a box body, the box body has a accommodating cavity, the box body has a first direction; at least one battery assembly, the battery assembly is arranged in the accommodating cavity, the battery assembly includes a plurality of battery cells and at least one first restraint member, the plurality of battery cells are arranged along the first direction, the first restraint member provides restraint forces in multiple directions to the plurality of battery cells, and the direction of at least one of the restraint forces in the multiple directions is parallel to the first direction.

[0006] According to the battery device of the embodiment of the utility model, at least one first restraint is provided on the plurality of battery cells, so that the first restraint surrounds the outer periphery of the plurality of battery cells, and when the battery cells swell, the first restraint disperses the pressure of the battery cells outward. Thus, compared with the traditional battery device, the restraint effect on the battery device is enhanced, the swelling of the battery cells is reduced, and the swelling of the battery device can be reduced, thereby ensuring the safety of the battery device and increasing the service life of the battery device.

[0007] According to some embodiments of the present invention, the first restraint is disposed on the outer circumference of the plurality of battery cells to connect the plurality of battery cells into the battery assembly.

[0008] According to some embodiments of the present invention, the battery box has a second direction, the second direction is perpendicular to the first direction, there are multiple first restraints, and the multiple first restraints are arranged at intervals along the second direction.

[0009] According to some embodiments of the utility model, a plurality of the battery cells are stacked along the first direction, and a side surface of two outermost battery cells among the plurality of the battery cells in the first direction away from the center of the battery cell assembly is a first surface, and the battery assembly also includes at least two second restraints, and at least two of the second restraints are spaced apart along the first direction, and the second restraints are located between the first surface and the first restraint.

[0010] According to some embodiments of the utility model, the box body has a second direction and a third direction, the first direction, the second direction and the third direction are orthogonal to each other, in the second direction, a side surface of the plurality of battery cells away from the center of the battery cell assembly is a second surface, at least two of the second restraints are spaced apart along the second direction, and the second restraint is located between the second surface and the first restraint; and / or, in the third direction, a side surface of the plurality of battery cells away from the center of the battery cell assembly is a third surface, at least two of the second restraints are spaced apart along the third direction, and the second restraint is located between the third surface and the first restraint.

[0011] According to some embodiments of the present invention, the first restraint member is a metal belt or an alloy belt, and the second restraint member is a metal plate or an alloy plate.

[0012] According to some embodiments of the present invention, on the projection plane of the first direction, the cross-sectional area of ​​the second restraint is greater than or equal to the cross-sectional area of ​​the battery core.

[0013] According to some embodiments of the utility model, there are multiple battery assemblies, and the box body further includes: a first fixing member and a second fixing member, the first fixing member and the second fixing member are arranged inside the box body at intervals along a second direction, the multiple battery assemblies are arranged along the second direction, and the multiple battery assemblies are arranged between the first fixing member and the second fixing member.

[0014] According to some embodiments of the utility model, the box body also includes: at least one cross beam, the cross beam is arranged on one side of the battery assembly in the first direction, the first fixing member and the second fixing member are fixed to the bottom wall of the box body, one end of the cross beam is connected to the first fixing member, and the other end of the cross beam is connected to the second fixing member, and the multiple battery assemblies are arranged between the cross beam and the bottom wall.

[0015] According to some embodiments of the utility model, the box body includes: a shell, which is open on one side of the first direction; a cover body, which is detachably arranged on the open side of the shell, and the cover body and the shell jointly define the accommodating cavity; a bracket, which is located in the accommodating cavity, the bracket is arranged on the bottom wall of the shell, and the battery assembly is fixedly connected to the bracket.

[0016] According to some embodiments of the utility model, the box body has a second direction and a third direction, the first direction, the second direction and the third direction are orthogonal to each other, a plurality of first limit members are provided on the bottom wall of the shell body, a plurality of first limit members are provided on both sides of the battery assembly in the first direction, and each of the first limit members is stopped against the battery assembly.

[0017] According to some embodiments of the utility model, the box body has a second direction and a third direction, the first direction, the second direction and the third direction are orthogonal to each other, a plurality of second limit members are provided on the bottom wall of the shell, a plurality of second limit members are provided on both sides of the battery assembly in the third direction, and each second limit member abuts against the battery assembly.

[0018] According to some embodiments of the present invention, the battery cell includes a soft-pack battery.

[0019] The energy storage device according to the embodiment of the second aspect of the utility model includes the battery device according to the embodiment of the first aspect of the utility model.

[0020] According to some embodiments of the utility model, the energy storage device includes a plurality of battery devices, the plurality of battery devices are stacked along a first direction, the plurality of battery devices are electrically connected via a wiring harness, or the plurality of battery devices are electrically connected via plug-in terminals.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0023] Figure 1 is an exploded view of a battery device according to an embodiment of the utility model;

[0024] Figure 2 is a schematic diagram of a battery device according to an embodiment of the utility model;

[0025] Figure 3is a schematic diagram of a battery assembly according to an embodiment of the utility model;

[0026] Figure 4 is a cross-sectional view of a battery device according to an embodiment of the utility model;

[0027] Figure 5 yes Figure 4 Enlarged view of section A shown in the middle circle.

[0028] Reference numerals:

[0029] 100. Battery device;

[0030] 1. Box body; 11. Shell; 12. Cover body; 13. Bracket; 14. Accommodating chamber; 141. First limiting member; 142. Second limiting member; 2. Battery assembly; 21. Battery cell; 22. First restraining member; 23. Second restraining member; 231. Positioning column; 24. Crossbeam; 25. First fixing member; 26. Second fixing member. DETAILED DESCRIPTION

[0031] Reference below Figure 1-Figure 5 A battery device 100 according to an embodiment of the first aspect of the present invention is described.

[0032] like Figure 1-Figure 5 As shown, the battery device 100 according to the first embodiment of the utility model includes a box body 1 and at least one battery assembly 2.

[0033] Specifically, the box body 1 has a receiving cavity 14, and the box body 1 has a first direction. The battery assembly 2 is disposed in the receiving cavity 14, and the battery assembly 2 includes a plurality of battery cells 21 and at least one first restraining member 22. In the description of the utility model, "plurality" means two or more. The plurality of battery cells 21 are arranged along the first direction, and the first restraining member 22 provides restraining forces in multiple directions to the plurality of battery cells 21, and the direction of at least one of the restraining forces in the multiple directions is parallel to the first direction.

[0034] For example, in Figure 1-Figure 5 In the example, the height direction of the accommodating cavity 14 (for example, Figure 1The up-down direction in the cavity 14 is the first direction. The multiple battery cells 21 are arranged in the height direction in the accommodating cavity 14. The first restraint 22 is in the shape of a long strip, and the first restraint 22 can extend along the circumference of the multiple battery cells 21 to wrap the multiple battery cells 21, thereby providing a restraint force in the circumference of the multiple battery cells 21 to bundle and tighten the multiple battery cells 21. The restraint force parallel to the first direction among the multiple restraint forces can tighten the multiple battery cells 21 in the first direction, thereby reducing the gap between two adjacent battery cells 21. As a result, the arrangement of the multiple battery cells 21 is more compact, and the volume of the battery assembly 2 can be reduced, so that the density of the battery assembly 2 can be increased in the limited accommodating cavity 14.

[0035] In addition, when the battery cell 21 generates gas due to chemical reaction during use, the pressure inside the battery cell 21 is greater than the atmospheric pressure. At this time, the outward pressure of the battery cell 21 will act on the first restraint member 22. The above pressure will be dispersed in the first restraint member 22, making it difficult for the first restraint member 22 to deform, thereby reducing the swelling of the battery cell 21, and then reducing the swelling of the battery device 100, thereby ensuring the safety of use and the service life of the battery device 100.

[0036] According to the battery device 100 of the embodiment of the utility model, at least one first restraint 22 is provided on the plurality of battery cells 21, so that the first restraint 22 surrounds the outer periphery of the plurality of battery cells 21. When the battery cells 21 swell, the first restraint 22 disperses the outward pressure of the battery cells 21. Thus, compared with the traditional battery device, the restraint effect on the battery device 100 is enhanced, the swelling of the battery cells 21 is reduced, and the swelling of the battery device 100 can be reduced, thereby ensuring the safety of the battery device 100 and increasing the service life of the battery device 100.

[0037] According to some embodiments of the utility model, the first restraint member 22 is sleeved on the outer circumference of the plurality of battery cells 21 to connect the plurality of battery cells 21 into a battery assembly 2. In this way, the plurality of battery cells 21 are connected as a whole, and the first restraint member 22 can provide restraint force to the plurality of battery cells 21 in two mutually perpendicular directions, thereby improving the reliability of the battery assembly 2, preventing the plurality of battery cells 21 from being dispersed, and increasing the service life of the battery assembly 2.

[0038] According to some embodiments of the present invention, the box body 1 has a second direction, the second direction is perpendicular to the first direction, the number of the first restraining members 22 is multiple, and the first restraining members 22 are arranged at intervals along the second direction. Figure 1-Figure 3 , the width direction of the box 1 (for example, Figure 1 The number of the first restraining members 22 is 3, and the 3 first restraining members 22 are arranged along the length direction of the battery cell 21 (for example, Figure 3The first restraint members 22 are arranged at intervals (in the left and right directions), and each first restraint member 22 is arranged around the outer circumference of the plurality of battery cells 21, so as to bundle the plurality of battery cells 21. In this way, the restraint force on the plurality of battery cells 21 can be uniform, so that the first restraint members 22 can limit the expansion of the plurality of battery cells 21, and at the same time ensure the reliability of the plurality of battery cells 21 and prevent the battery cells 21 from shaking.

[0039] According to some embodiments of the utility model, a plurality of battery cells 21 are stacked along a first direction, and a side surface of two outermost battery cells 21 in the first direction away from the center of the battery assembly 2 is a first surface. The battery assembly 2 further includes at least two second restraints 23, which are spaced apart along the first direction, and the second restraints 23 are located between the first surface and the first restraint 22.

[0040] Reference Figure 1-Figure 3 , both surfaces of the multiple battery cells 21 on both sides of the first direction are first surfaces, and at least one second restraint 23 is located on the side of the first surface away from the battery cell 21. The first restraint 22 surrounds the outer periphery of the second restraint 23 and the multiple battery cells 21, and bundles the second restraint 23 and the multiple battery cells 21 to prevent the second restraint 23 from falling off the multiple battery cells 21, and also enhances the restraining force of the second restraint 23 on the multiple battery cells 21, so that the second restraint 23 can effectively restrain the battery cell 21, so that the battery cell 21 can be restrained when it swells, and the volume of the battery cell 21 can be prevented from expanding. At the same time, the second restraint 23 can protect the battery cell 21 and prevent the first restraint 22 from damaging the battery cell 21 when bundling.

[0041] According to some embodiments of the utility model, the box body 1 has a second direction and a third direction, the first direction, the second direction and the third direction are orthogonal to each other, in the second direction, the side surface of the plurality of battery cells 21 away from the center of the battery assembly 2 is the second surface, at least two second restraints 23 are arranged at intervals along the second direction, and the second restraints 23 are located between the second surface and the first restraints 22 (not shown in the figure). And / or, in the third direction, the side surface of the plurality of battery cells 21 away from the center of the battery assembly 2 is the third surface, at least two second restraints 23 are arranged at intervals along the third direction, and the second restraints 23 are located between the third surface and the first restraints 22 (not shown in the figure).

[0042] like Figure 1-Figure 3 As shown, the length direction of the box 1 (for example, Figure 1The left-right direction in the figure is the third direction. At least two second restraints 23 can be arranged on the side of the second surface away from the battery cell 21. And / or, at least two second restraints 23 can be arranged on the side of the third surface away from the battery cell 21. In this way, the six surfaces of the outer circumference of the plurality of battery cells 21 can have at least two second restraints 23, which can further limit the expansion of the battery cell 21 and protect the battery cell 21 when the first restraint 22 is used to bundle the battery cell 21.

[0043] Among them, Figure 1-Figure 3 As shown, the number of the second restraints 23 can be two, and the two second restraints 23 respectively cover the two first surfaces on both sides of the multiple battery cells 21 in the first direction. The two second restraints 23 are bundled on the multiple battery cells 21 through the first restraint 22, so that the second restraints 23 can simultaneously apply restraint force to the first restraint 22, reduce the swelling degree of the multiple battery cells 21, control the volume change of the multiple battery cells 21, and further reduce the swelling of the battery device 100.

[0044] Optionally, the first restraint 22 is a metal belt or an alloy belt, and the second restraint 23 is a metal plate or an alloy plate. The metal belt or the alloy belt has the advantages of high dimensional accuracy, good surface quality, easy processing, and material saving. The use of the metal belt or the alloy belt facilitates bundling multiple battery cells 21 to achieve the restraint of the multiple battery cells 21. The metal plate or the alloy plate has the advantages of high strength, resistance to high temperature, high pressure, low temperature, corrosion resistance, and wear resistance. The metal plate or the alloy plate is arranged on both sides of the third direction of the multiple battery cells 21 as the second restraint 23, and the second restraint 23 and the multiple battery cells 21 are bundled by the first restraint 22, which can enhance the restraint force on the multiple battery cells 21, and is simple to install, which is conducive to increasing the structural compactness of the battery assembly 2.

[0045] According to some embodiments of the present invention, on the projection surface in the first direction, the cross-sectional area of ​​the second restraining member 23 is greater than or equal to the cross-sectional area of ​​the battery cell 21. Figure 1-Figure 3, the cross-section of the second restraint 23 is in a rectangular shape. In the first direction, when the cross-sectional area of ​​the second restraint 23 is smaller than the cross-sectional area of ​​the battery cell 21, the second restraint 23 cannot completely cover the first surface of the battery cell 21. When multiple battery cells 21 swell during use, the second restraint 23 cannot completely restrain the battery cell 21, resulting in insufficient restraint force on the battery cell 21 when it swells, causing multiple battery cells 21 to deform, shortening the service life of the battery cell 21, and the first restraint 22 may also cause damage to the battery cell 21 when bundling the battery cell 21. Therefore, by making the cross-sectional area of ​​the second restraint 23 greater than or equal to the cross-sectional area of ​​the battery cell 21 on the projection surface in the first direction, the restraint force of the second restraint 23 on the battery cell 21 can be guaranteed, which can further play a limiting role when the battery cell 21 swells, and also play a protective role when the first restraint 22 bundles the battery cell 21.

[0046] According to some embodiments of the present invention, there are multiple battery assemblies 2, and the box body 1 further includes a first fixing member 25 and a second fixing member 26. The first fixing member 25 and the second fixing member 26 are arranged inside the box body 1 along the second direction, and the multiple battery assemblies 2 are arranged along the second direction, and the multiple battery assemblies 2 are arranged between the first fixing member 25 and the second fixing member 26. Figure 1 As shown, the first fixing member 25 and the second fixing member 26 are respectively located on both sides of the plurality of battery cells 21 in the second direction, and the first fixing member 25 and the second fixing member 26 both extend along the first direction, and one end of the first fixing member 25 and the second fixing member 26 in the length direction is connected to the bottom wall of the box body 1, and the other end of the first fixing member 25 and the second fixing member 26 in the length direction is connected to the crossbeam 24. The first fixing member 25 and the second fixing member 26 both contact the battery cells 21.

[0047] According to some embodiments of the present invention, the box body further comprises a crossbeam 24, which is arranged on one side of the battery assembly 2 in the first direction, the first fixing member 25 and the second fixing member 26 are fixed to the bottom wall of the box body 1, one end of the crossbeam 24 is connected to the first fixing member 25, and the other end of the crossbeam 24 is connected to the second fixing member 26, and a plurality of battery assemblies 2 are arranged between the crossbeam 24 and the bottom wall. Figure 1 and Figure 2 , the number of battery assemblies 2 is 4, and the 4 battery assemblies 2 are arranged at intervals along the length direction of the accommodating cavity 14. In this arrangement, when the crossbeam 24 is arranged above the battery assembly 2, it is convenient to connect the crossbeam 24 with the first fixing member 25 and the second fixing member 26, and the positions of the multiple battery cells 21 can be restricted to prevent the multiple battery cells 21 from shaking in the accommodating cavity 14, thereby increasing the battery capacity of the battery device 100 and improving the service life of the battery device 100.

[0048] The length direction of the beam 24 (for example, Figure 1The left-right direction in the figure is the width direction of the battery assembly 2. The second restraining member 23 is provided with a plurality of positioning posts 231, and the crossbeam 24 is pre-placed on the battery assembly 2 through the plurality of positioning posts 231, and then fixed to the battery assembly 2 through fasteners such as screws, and at the same time, both ends of the crossbeam 24 in the length direction are connected to the shell 11 of the box body 1.

[0049] like Figure 2 As shown, there are two cross beams 24, which are arranged at intervals along the length direction of the battery assembly 2, and the length of the cross beam 24 extends beyond the two sides of the battery assembly 2 to connect with the housing 11. Therefore, the assembly of the cross beam 24 is convenient, the cost is reduced, and it is also beneficial to fix the battery assembly 2 in the accommodating cavity 14, so that the force of the cross beam 24 on the battery assembly 2 is evenly distributed, and the restraining effect on the battery assembly 2 is enhanced.

[0050] According to some specific embodiments of the present invention, the box body 1 includes a shell 11, a cover 12 and a bracket 13. The shell 11 is open on one side in the third direction. The cover 12 is detachably arranged on the open side of the shell 11, and the cover 12 and the shell 11 together define a receiving cavity 14. The bracket 13 is located in the receiving cavity 14, and the bracket 13 is arranged on the bottom wall of the shell 11, and the battery assembly 2 is fixedly connected to the bracket 13. Figure 1 , Figure 2 and Figure 4 The cross-sections of the shell 11 and the cover 12 are both rectangular, so that the shell 11 and the cover 12 can cooperate and define the accommodating cavity 14. The cover 12 is detachably connected to the shell 11, which facilitates the inspection of the interior of the box 1. The bracket 13 is welded to the bottom wall of the shell 11, and the battery assembly 2 is placed on the bracket 13, and the bracket 13 is fixedly connected to the battery assembly 2, so that the position of the battery assembly 2 in the accommodating cavity 14 is fixed to prevent the battery assembly 2 from shaking in the accommodating cavity 14, and the bracket 13 can further enhance the restraint effect on the battery assembly 2.

[0051] According to some embodiments of the present invention, a plurality of first stoppers 141 are disposed on the bottom wall of the housing 11, and the plurality of first stoppers 141 are disposed on both sides of the battery assembly 2 in the first direction, and each first stopper 141 abuts against the battery assembly 2. Figure 4 and Figure 5 The first limiting member 141 is disposed on both sides of the battery assembly 2 in the width direction, so that the first limiting member 141 can limit the battery assembly 2 in the width direction to prevent the battery assembly 2 from moving in the first direction.

[0052] Specifically, Figure 4As shown, first stoppers 141 are provided on both sides of the width direction of the bottom wall of the shell 11. There may be 8 first stoppers 141 located on the same side of the width direction of the bottom wall of the shell 11, and the 8 first stoppers 141 are divided into four pairs in pairs. The cross-section of the first stoppers 141 is L-shaped, and the two first stoppers 141 in each pair of first stoppers 141 are arranged opposite to each other, and the distance between the two first stoppers 141 in each pair of first stoppers 141 is equal to the width of the battery assembly 2. Thus, the battery assembly 2 is clamped between each pair of first stoppers 141, and the two side surfaces of the battery assembly 2 in the width direction are stopped against the corresponding first stoppers 141. At this time, the first stoppers 141 can limit the battery assembly 2 to prevent the battery assembly 2 from moving along the first direction, so that the battery assembly 2 is fixed in the first direction of the accommodating cavity 14, and the installation of the battery assembly 2 is also convenient.

[0053] Furthermore, a plurality of second stoppers 142 are disposed on the bottom wall of the housing 11, and the plurality of second stoppers 142 are disposed on both sides of the battery assembly 2 in the second direction, each second stopper 142 abuts against the battery assembly 2, and each second stopper 142 extends along the first direction. Figure 4 and Figure 5 As shown, the second stopper 142 is located on the side of the first stopper 141 away from the battery assembly 2. The second stopper 142 extends along the length direction of the bottom wall of the housing 11, and the cross-section of the second stopper 142 is L-shaped. When the battery assembly 2 is placed in the accommodating cavity 14, the two side surfaces of the battery assembly 2 in the length direction abut against the second stopper 142 to prevent the battery assembly 2 from moving along the second direction of the housing 11, so that the battery assembly 2 is fixed in the second direction of the accommodating cavity 14, and the installation of the battery assembly 2 is facilitated.

[0054] It should be noted that the first stopper 141 and the second stopper 142 are connected to the bottom wall of the housing 11 by welding, so that the first stopper 141 and the second stopper 142 can fix the battery assembly 2 more firmly.

[0055] According to some embodiments of the present invention, the battery cell 21 includes a soft-pack battery. The soft-pack battery has the advantages of good safety performance, light weight, and large battery capacity. The use of the soft-pack battery can extend the use time of the battery device 100 and improve the user experience.

[0056] The energy storage device (not shown) according to the second embodiment of the utility model includes the battery device 100 according to the first embodiment of the utility model.

[0057] According to the energy storage device of the embodiment of the utility model, by adopting the above-mentioned battery device 100, the volume occupied by the battery device 100 in the energy storage device is reduced, the production is simple, and the production cost is reduced.

[0058] According to some embodiments of the utility model, the energy storage device includes a plurality of battery devices 100, the plurality of battery devices 100 are stacked in a first direction, and the plurality of battery devices 100 are electrically connected via a wiring harness, or the plurality of battery devices 100 are electrically connected via plug-in terminals. By providing a plurality of battery devices 100 and stacking the battery devices 100 in the first direction, the battery capacity of the energy storage device is increased, the service life of the energy storage device is increased, and the user experience is improved.

[0059] Other structures and operations of the energy storage device according to the embodiment of the utility model are known to ordinary technicians in the field and will not be described in detail here.

[0060] In the description of the present invention, it is necessary to understand that the terms "length", "width", "thickness", "up", "down", "bottom", "inside", "outside", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0061] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0062] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0063] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery device, characterized in that: include: A box body, the box body having a receiving cavity, and the box body having a first direction; At least one battery assembly is arranged in the accommodating cavity, the battery assembly includes a plurality of battery cells and at least one first restraint member, the plurality of battery cells are arranged along a first direction, the first restraint member provides restraint forces in multiple directions to the plurality of battery cells, and the direction of at least one of the restraint forces in the multiple directions is parallel to the first direction.

2. The battery device according to claim 1, characterized in that: The first restraint is sleeved on the outer circumference of the plurality of battery cells to connect the plurality of battery cells into the battery assembly.

3. The battery device according to claim 2, characterized in that: The battery box has a second direction, the second direction is perpendicular to the first direction, there are multiple first restraining members, and the multiple first restraining members are arranged at intervals along the second direction.

4. The battery device according to claim 1, characterized in that: The plurality of battery cells are stacked along the first direction, and the surfaces of the two outermost battery cells among the plurality of battery cells in the first direction, which are away from the center of the battery cell assembly, are first surfaces; The battery assembly also includes: At least two second restraints are provided, and the at least two second restraints are spaced apart along the first direction, and the second restraints are located between the first surface and the first restraint.

5. The battery device according to claim 4, characterized in that: The box has a second direction and a third direction, and the first direction, the second direction and the third direction are orthogonal to each other. In the second direction, a side surface of the plurality of battery cells away from the center of the battery cell assembly is a second surface, at least two of the second restraints are spaced apart along the second direction, and the second restraint is located between the second surface and the first restraint; and / or, in the third direction, a side surface of the plurality of battery cells away from the center of the battery cell assembly is a third surface, at least two of the second restraints are spaced apart along the third direction, and the second restraint is located between the third surface and the first restraint.

6. The battery device according to claim 4, characterized in that: The first restraining member is a metal belt or an alloy belt, and the second restraining member is a metal plate or an alloy plate.

7. The battery device according to claim 4, characterized in that: On the projection surface in the first direction, the cross-sectional area of ​​the second restraint is greater than or equal to the cross-sectional area of ​​the battery core.

8. The battery device according to any one of claims 1 to 7, characterized in that: The number of the battery assemblies is multiple, and the box body also includes: A first fixing member and a second fixing member, wherein the first fixing member and the second fixing member are spaced apart inside the box along a second direction, a plurality of the battery assemblies are arranged along the second direction, and a plurality of the battery assemblies are arranged between the first fixing member and the second fixing member.

9. The battery device according to claim 8, characterized in that: The box also includes: At least one cross beam, the cross beam is arranged on one side of the battery assembly in the first direction, the first fixing member and the second fixing member are fixed to the bottom wall of the box body, one end of the cross beam is connected to the first fixing member, and the other end of the cross beam is connected to the second fixing member, and the multiple battery assemblies are arranged between the cross beam and the bottom wall.

10. The battery device according to any one of claims 1 to 7, characterized in that: The box body comprises: a housing, wherein the housing is open on one side in the first direction; A cover body, the cover body is detachably arranged on the open side of the shell, and the cover body and the shell together define the accommodating cavity; A bracket is located in the accommodating cavity, the bracket is arranged on the bottom wall of the shell, and the battery assembly is fixedly connected to the bracket.

11. The battery device according to claim 10, characterized in that: The box body has a second direction and a third direction, the first direction, the second direction and the third direction are orthogonal to each other, a plurality of first limit members are provided on the bottom wall of the shell body, a plurality of the first limit members are provided on both sides of the battery assembly in the second direction, and each of the first limit members abuts against the battery assembly.

12. The battery device according to claim 10, characterized in that: The box body has a second direction and a third direction, the first direction, the second direction and the third direction are orthogonal to each other, a plurality of second limit members are provided on the bottom wall of the shell body, a plurality of second limit members are provided on both sides of the battery assembly in the third direction, and each second limit member abuts against the battery assembly.

13. The battery device according to any one of claims 1 to 7, characterized in that: The battery cell includes a soft-pack battery.

14. An energy storage device, characterized in that: Comprising a battery device according to any one of claims 1-13.

15. The energy storage device according to claim 14, characterized in that: The energy storage device includes a plurality of battery devices, which are stacked along a first direction and electrically connected to each other via a wiring harness, or electrically connected to each other via plug-in terminals.

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