Battery box, battery pack and power utilization system

Abstract

The utility model discloses a battery box, a battery pack and a power utilization system. The battery box comprises a tray frame and a bottom plate, the top and the bottom of the tray frame are open, the tray frame comprises a plurality of edge beams and at least one limiting beam, the two ends of each limiting beam are connected with the corresponding edge beams respectively, and the limiting beams extend in the first direction. The bottom plate is connected to the bottom of the tray frame, the bottom plate and the tray frame jointly define a plurality of battery cell containing cavities, the battery cell containing cavities are arranged in the second direction, and the second direction is perpendicular to the first direction. And each battery cell accommodating cavity is suitable for being communicated with the outside through an anti-explosion valve. According to the battery box disclosed by the utility model, gas in each battery cell accommodating cavity is directly exhausted from the anti-explosion valve, the arrangement of an exhaust channel in the limiting beam is cancelled, and the flowing path of the gas is shortened, so that the exhaust and pressure relief efficiency is improved, the thickness of the limiting beam is reduced, the size of the battery box is reduced, and the applicability of the battery box is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery boxes, in particular to a battery box, a battery pack and an electricity system. Background Art

[0002] In the related art, in order to prevent gas from flowing between adjacent battery cell cavities, an exhaust channel is usually formed on the middle beam of the tray between adjacent battery cell cavities, and an exhaust inlet is formed on the middle beam of the tray corresponding to each battery cell cavity, so that the gas in the battery cell cavity enters the exhaust channel through the exhaust inlet and then is discharged to the outside through the exhaust channel. However, the above exhaust path is long and the exhaust efficiency is low. At the same time, the existence of the exhaust channel increases the volume of the middle beam of the tray, thereby increasing the volume of the battery box and reducing the applicability of the battery box. 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 box, in which the gas in each battery cell accommodating cavity is directly discharged from the explosion-proof valve, shortening the flow path of the gas, thereby improving the efficiency of exhaust and pressure relief, while reducing the thickness of the limit beam, reducing the size of the battery box, and increasing the applicability of the battery box.

[0004] Another object of the present invention is to provide a battery pack using the above-mentioned battery box.

[0005] Another object of the present invention is to provide an electric power system using the above battery pack.

[0006] According to the battery box of the first aspect embodiment of the utility model, it includes: a tray frame, the top and bottom of the tray frame are open, the tray frame includes a plurality of side beams and at least one limiting beam, the two ends of the limiting beam are respectively connected to the corresponding side beams, and the limiting beam extends along a first direction; a bottom plate, the bottom plate is connected to the bottom of the tray frame, the bottom plate and the tray frame jointly define a plurality of battery cell accommodating cavities, the plurality of battery cell accommodating cavities are arranged along a second direction, and the second direction is perpendicular to the first direction; wherein each of the battery cell accommodating cavities is suitable for communicating with the outside through an explosion-proof valve.

[0007] According to the battery box of the embodiment of the utility model, the battery cell accommodating cavity is connected to the outside world through the explosion-proof valve. Compared with the traditional battery box, the gas in each battery cell accommodating cavity is directly discharged from the explosion-proof valve, the exhaust channel in the limit beam is eliminated, the gas flow path is shortened, and the efficiency of exhaust pressure relief is improved. At the same time, the thickness of the limit beam is reduced, the size of the battery box is reduced, and the applicability of the battery box is increased.

[0008] According to some embodiments of the utility model, one end of the side beam adjacent to the bottom plate has a first extension portion, the first extension portion is located on a side of the side beam adjacent to the limiting beam, the first extension portion extends in a direction toward the limiting beam, and the bottom plate abuts against the first extension portion.

[0009] According to some embodiments of the present invention, one end of the limiting beam adjacent to the bottom plate has a second extension portion, the second extension portion extends toward the center of the battery cell accommodating cavity in the second direction, and the bottom plate abuts against the second extension portion.

[0010] According to some embodiments of the present invention, the battery box further comprises a liquid cooling plate, which is disposed on the top of the tray frame and connected to the plurality of limit beams via fasteners.

[0011] According to some embodiments of the present utility model, the limiting beam includes at least one connecting column and a plurality of connecting plates, the connecting column is located between two adjacent connecting plates, and the fastener passes through the liquid cooling plate and is connected to the connecting column.

[0012] According to some embodiments of the present invention, the thickness of the connecting plate in the second direction is smaller than the thickness of the connecting column.

[0013] According to some embodiments of the present invention, a side of the liquid cooling plate adjacent to the tray frame is provided with thermal conductive glue.

[0014] According to some embodiments of the present invention, the battery box further comprises a protective plate, which is arranged on a side of the bottom plate away from the tray frame, and the protective plate shields the bottom of the tray frame.

[0015] According to some embodiments of the present invention, the battery box further comprises a plurality of fixing brackets, the plurality of fixing brackets are spaced apart along the circumference of the tray frame, and each of the fixing brackets is connected to the side beam and / or the protective plate.

[0016] According to some embodiments of the utility model, an exhaust hole communicating with the battery cell accommodating cavity is formed on the side beam, and the exhaust hole is suitable for installing the explosion-proof valve.

[0017] According to some embodiments of the utility model, there are multiple bottom plates, all of which are connected to the bottom of the tray frame, and the multiple bottom plates are spaced apart along the second direction, and each bottom plate and the tray frame together define a battery cell accommodating cavity.

[0018] A battery pack according to an embodiment of the second aspect of the utility model includes a battery box, which is the battery box according to the embodiment of the first aspect of the utility model; a plurality of battery cell groups, each of which is arranged in a corresponding battery cell accommodating cavity of the battery box, and each of the battery cell groups includes a plurality of battery cells.

[0019] The power consumption system according to the embodiment of the third aspect of the utility model is characterized by comprising a battery pack according to the embodiment of the second aspect of the utility model.

[0020] 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

[0021] 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:

[0022] Figure 1 is a schematic diagram of a battery box according to an embodiment of the utility model, wherein a liquid cooling plate is not shown;

[0023] Figure 2 is a schematic diagram of a battery pack according to an embodiment of the utility model, wherein a liquid cooling plate is not shown;

[0024] Figure 3 is a schematic diagram of a battery box according to an embodiment of the utility model;

[0025] Figure 4 yes Figure 3 Schematic diagram of the connection between the battery box and the fender shown in ;

[0026] Figure 5 is a schematic diagram of a battery box according to another embodiment of the utility model;

[0027] Figure 6 yes Figure 5 Schematic diagram of the connection between the battery box and the fender shown in ;

[0028] Figure 7 is a wiring diagram of a battery cell group according to an embodiment of the utility model, wherein the number of battery cells in each battery cell group is an odd number;

[0029] Figure 8 Schematic diagram of the wiring of the battery cell group according to an embodiment of the utility model, wherein the number of battery cells in each battery cell group is an even number.

[0030] Reference numerals:

[0031] 100: battery box;

[0032] 1: tray frame; 11: side beam; 111: exhaust hole; 112: first extension; 12: limit beam; 121: second extension; 122: connection column; 123: connection plate; 2: bottom plate; 3: battery cell accommodating chamber; 4: liquid cooling plate; 41: fastener; 5: protection plate; 6: fixing bracket; 7: power distribution chamber;

[0033] 200: battery pack; 201: battery cell group; 2011: battery cell; 202: power distribution device;

[0034] 300: Mudguard. DETAILED DESCRIPTION

[0035] Reference below Figure 1-Figure 8 A battery box 100 according to an embodiment of the first aspect of the present invention is described.

[0036] like Figure 1-Figure 8 As shown, the battery box 100 according to the first embodiment of the utility model comprises a tray frame 1 and a bottom plate 2. In the description of the utility model, "plurality" means two or more.

[0037] Specifically, the top and bottom of the pallet frame 1 are open, and the pallet frame 1 includes a plurality of side beams 11 and at least one limiting beam 12. The two ends of the limiting beam 12 are respectively connected to the corresponding side beams 11, and the limiting beam 12 is arranged along a first direction (for example, Figure 1 The bottom plate 2 is connected to the bottom of the tray frame 1, and the bottom plate 2 and the tray frame 1 together define a plurality of battery cell accommodating cavities 3, and the plurality of battery cell accommodating cavities 3 extend along the second direction (for example, Figure 1 The second direction is perpendicular to the first direction. Each battery cell accommodating cavity 3 is suitable for communicating with the outside through an explosion-proof valve.

[0038] For example, in Figure 1 and Figure 2 In the example, the tray frame 1 has four side beams 11 connected in sequence, and the tray frame 1 has three limit beams 12, which are arranged at intervals along the second direction. The two ends of each limit beam 12 in the first direction are respectively connected to two opposite side beams 11, and the bottom plate 2 is connected to the bottom of the tray frame 1 to partition into three battery cell accommodating cavities 3 and a power distribution cavity 7. The battery cell accommodating cavity 3 is suitable for installing a battery cell 2011, and the power distribution cavity 7 is suitable for installing a power distribution device 202, and the power distribution device 202 is electrically connected to the battery cell 2011. Therefore, by spacing the three battery cell accommodating cavities 3, it is possible to avoid thermal runaway of a certain battery cell 2011, which may cause arcing and fire of all the battery cells 2011 as a whole, thereby greatly improving the safety of the battery box 100.

[0039] Optionally, the bottom plate 2 can be stir-friction welded to the side beam 11 of the pallet frame 1 by an aluminum plate, thereby improving the connection stability between the bottom plate 2 and the pallet frame 1 and simplifying the connection process between the pallet frame 1 and the bottom plate 2.

[0040] Optionally, the plurality of side beams 11 and the plurality of limit beams 12 may be integrally stamped to increase the overall structural unity of the pallet frame 1 , thereby improving the structural strength of the pallet frame 1 and extending the service life of the pallet frame 1 .

[0041] When the air pressure in a certain battery cell accommodating chamber 3 is too high, the explosion-proof valve automatically opens to release the pressure, thereby preventing deformation of the tray frame 1 and the bottom plate 2 caused by excessive air pressure, and preventing the battery cell 2011 in the battery cell accommodating chamber 3 from thermal explosion, thereby preventing the battery box 100 from exploding, and improving the safety and stability of the battery box 100. At the same time, the explosion-proof valve can also play a waterproof function, preventing water mist from the outside of the battery box 100 from entering the battery cell accommodating chamber 3 and affecting the operation of the battery cell 2011.

[0042] Therefore, compared with the traditional battery box 100, the gas is directly discharged from the explosion-proof valves corresponding to each battery cell accommodating cavity 3, the exhaust channel in the limiting beam 12 is cancelled, the gas flow path is shortened, and the efficiency of exhaust and pressure relief is improved. At the same time, the thickness of the limiting beam 12 is reduced, the size of the battery box 100 is reduced, and the applicability of the battery box 100 is increased.

[0043] According to the battery box 100 of the embodiment of the utility model, the battery cell accommodating chamber 3 is connected to the outside world through the explosion-proof valve. Compared with the traditional battery box 100, the gas in each battery cell accommodating chamber 3 is directly discharged from the explosion-proof valve, the exhaust channel in the limit beam 12 is cancelled, the flow path of the gas is shortened, and the efficiency of exhaust pressure relief is improved. At the same time, the thickness of the limit beam 12 is reduced, the size of the battery box 100 is reduced, and the applicability of the battery box 100 is increased.

[0044] According to some embodiments of the present invention, referring to Figure 1 The side beam 11 has a first extension portion 112 at one end adjacent to the bottom plate 2. The first extension portion 112 is located on one side of the side beam 11 adjacent to the limiting beam 12. The first extension portion 112 extends in a direction toward the limiting beam 12, and the bottom plate 2 abuts against the first extension portion 112. Thus, the connection area between the bottom plate 2 and the side beam 11 is increased, thereby improving the stability of the bottom plate 2 connected to the bottom of the tray frame 1, avoiding the separation of the bottom plate 2 and the tray frame 1 due to the high air pressure in the battery cell accommodating chamber 3, and further improving the stability of the battery box 100.

[0045] Further, refer to Figure 1, one end of the limiting beam 12 adjacent to the bottom plate 2 has a second extension portion 121, and the second extension portion 121 extends toward the center of the battery cell accommodating chamber 3 in the second direction, and the bottom plate 2 abuts against the second extension portion 121. Thus, the connection area between the bottom plate 2 and the limiting beam 12 is increased, thereby improving the connection stability between the bottom plate 2 and the limiting beam 12. At the same time, the separation of the limiting beam 12 from the bottom plate 2 due to the high air pressure in the battery cell accommodating chamber 3 is avoided, thereby preventing high-temperature gas from flowing in the adjacent battery cell accommodating chamber 3 to cause thermal runaway of more battery cells 2011, thereby further improving the safety of the battery box 100.

[0046] According to some embodiments of the utility model, the battery box 100 further includes a liquid cooling plate 4, which is disposed on the top of the tray frame 1 and is connected to the plurality of limit beams 12 via fasteners 41. Thus, the liquid cooling plate 4 blocks the top of the tray frame 1 to protect the top of the battery cell 2011 in the battery cell accommodating cavity 3, and the liquid cooling plate 4 can timely perform heat exchange on the heat generated by the battery cell 2011 to reduce the temperature of the battery cell 2011 and improve the operating stability of the battery cell 2011.

[0047] The liquid cooling plate 4 and the limiting beam 12 are connected by fasteners 41 to increase the connection stability of the liquid cooling plate 4 on the top of the tray frame 1, to prevent the liquid cooling plate 4 from bulging away from the center of the battery cell accommodating cavity 3 when a battery cell 2011 in the battery box 100 has thermal runaway, thereby preventing high-temperature gas from flowing in adjacent battery cell accommodating cavities 3 and causing more battery cells 2011 to have thermal runaway, thereby avoiding the occurrence of thermal safety accidents and improving the safety of the battery box 100.

[0048] Further, refer to Figure 1 The limiting beam 12 includes at least one connecting column 122 and a plurality of connecting plates 123. The connecting column 122 is located between two adjacent connecting plates 123. The fastener 41 passes through the liquid cooling plate 4 and is connected to the connecting column 122. In other words, the connecting column 122 and the connecting plate 123 are arranged at intervals, so that the liquid cooling plate 4 and the limiting beam 12 are connected at intervals, thereby improving the connection stability between the liquid cooling plate 4 and the limiting beam 12. At the same time, the structure of the limiting beam 12 is simplified, which is conducive to saving space in the tray frame 1 and improving the applicability of the battery box 100.

[0049] The plurality of connection columns 122 and the plurality of connection plates 123 are integrally formed to improve the integrity of the limiting beam 12 , increase the structural strength of the limiting beam 12 , and extend the service life of the limiting beam 12 .

[0050] Furthermore, in the second direction, the thickness of the connecting plate 123 is less than the thickness of the connecting column 122. Thus, on the basis of satisfying the spacing of the adjacent battery cell accommodating chambers 3 by the limiting beam 12, the thickness of the connecting plate 123 is reduced, which is beneficial to saving space in the tray frame 1, improving the applicability of the battery box 100, and at the same time facilitating the lightweighting of the battery box 100.

[0051] Furthermore, a thermally conductive adhesive is provided on one side of the liquid cooling plate 4 adjacent to the tray frame 1. The thermally conductive adhesive has excellent adhesion, resistance to alternating cold and heat, resistance to aging and electrical insulation, and has excellent moisture resistance, shock resistance, corona resistance, resistance to leakage and resistance to chemical media. At the same time, the thermally conductive adhesive can maintain performance at -60 to 280°C. Thus, the liquid cooling plate 4 is connected to the battery cell 2011 through the thermally conductive adhesive, which increases the connection stability between the liquid cooling plate 4 and the battery cell 2011, and is conducive to improving the service life of the battery box 100.

[0052] According to some embodiments of the utility model, the battery box 100 further includes a protection plate 5, which is disposed on a side of the bottom plate 2 away from the tray frame 1, and the protection plate 5 shields the bottom of the tray frame 1. Thus, the bottom plate 2 is protected by the protection plate 5, the structural uniformity of the bottom of the tray frame 1 is improved, water vapor and dust are prevented from directly contacting the bottom plate 2 to reduce the aging resistance of the bottom plate 2, and water vapor and dust are prevented from entering the battery cell accommodating cavity 3 through the gap between the bottom plate 2 and the tray frame 1 to affect the normal use of the battery cell 2011, thereby further extending the service life of the battery box 100.

[0053] Furthermore, the battery box 100 further includes a plurality of fixing brackets 6, which are spaced apart along the circumference of the tray frame 1, and each fixing bracket 6 is connected to the side beam 11 and / or the protection plate 5. In other words, the fixing bracket 6 may be connected only to the side beam 11; or, the fixing bracket 6 may be connected only to the protection plate 5; or, the fixing bracket 6 may be connected to both the side beam 11 and the protection plate 5. Thus, the battery box 100 may be connected to the rest of the surrounding components through the fixing bracket 6.

[0054] like Figure 2-Figure 4 As shown, ten fixing brackets 6 are arranged at intervals on the side beams 11 along the circumference of the pallet frame 1, and five fixing brackets 6 are arranged on both sides of the first direction of the pallet frame 1. Figure 5 and Figure 6 As shown, ten fixing brackets 6 are provided on the protection plate 5 at intervals along the circumference of the pallet frame 1 , and five fixing brackets 6 are provided on both sides of the protection plate 5 in the width direction.

[0055] One end of the fixing bracket 6 away from the pallet frame 1 and / or the protective plate 5 can be connected to the mudguard 300, which increases the connection stability between the mudguard 300 and the battery box 100, thereby facilitating the use of the mudguard 300 to prevent water vapor or dirt from falling on components adjacent to the battery box 100.

[0056] The fixing bracket 6 may be connected to the side beam 11 or the protection plate 5 by welding or the like; or the fixing bracket 6 may be integrally formed with the side beam 11 or the protection plate 5 .

[0057] Optionally, a vent hole 111 communicating with the battery cell accommodating chamber 3 is formed on the side beam 11, and the vent hole 111 is suitable for installing an explosion-proof valve. Three vent holes 111 are formed on the tray frame 1, that is, each battery cell accommodating chamber 3 corresponds to a vent hole 111, and an explosion-proof valve is installed in each vent hole 111, thereby improving the safety and stability of the battery box 100.

[0058] Optionally, there are multiple bottom plates 2, all of which are connected to the bottom of the tray frame 1, and the multiple bottom plates 2 are spaced apart along the second direction, and each bottom plate 2 and the tray frame 1 together define a battery cell accommodating cavity 3. Thus, it is convenient to replace or repair the bottom plate 2 corresponding to each battery cell accommodating cavity 3 separately, thereby reducing the difficulty of repairing the battery box 100 and reducing the repair cost of the battery box 100.

[0059] Reference Figure 2 According to the second aspect of the present invention, the battery pack 200 includes a battery box 100 and a plurality of battery cell groups 201. The battery box 100 is the battery box 100 according to the first aspect of the present invention. Each battery cell group 201 is disposed in a corresponding battery cell accommodating cavity 3 of the battery box 100, and each battery cell group 201 includes a plurality of battery cells 2011.

[0060] like Figure 2 As shown, the battery box 100 is provided with three battery cell groups 201, and the three battery cell groups 201 are respectively arranged in corresponding battery cell accommodating chambers 3 to avoid heat exchange between the three battery cell groups 201, thereby increasing the use stability of the battery box 100 and extending the service life of the battery box 100. Figure 2 As shown, each battery cell group 201 includes a plurality of battery cells 2011, and each battery cell 2011 extends along the length direction of the battery box 100, so that the plurality of battery cells 2011 are stacked along the width direction of the battery box 100, thereby improving the regularity of the arrangement of the battery cells 2011 in the battery cell group 201, so as to increase the operating stability of the battery box 100.

[0061] According to the battery pack 200 of the embodiment of the present invention, by adopting the above-mentioned battery box 100, it is beneficial to improve the structural regularity and thermal safety of the battery pack 200 and reduce the cost of the battery pack 200.

[0062] The number of cells 2011 in each cell group 201 is N, where N satisfies: N=2n+1, and n is an integer. Then the number of cells 2011 in each cell group 201 is an odd number. Figure 7 There are three battery cell groups 201, and the battery cells 2011 in each battery cell group 201 are connected in series. The three battery cell groups 201 are connected in series, and the total positive pole of the first battery cell group 201 is connected to the right side of the distribution device 202, and the total negative pole of the last battery cell group 201 is connected to the left side of the distribution device 202, which increases the orderliness of the lines between the total positive pole and the total negative pole and the distribution device 202, avoids interference between the lines, and thus increases the operating stability of the battery cell groups 201.

[0063] Of course, in other embodiments, the number of the battery cells 2011 in each battery cell group 201 may also be an even number. Figure 8 The battery cells 2011 in each battery cell group 201 are electrically connected in series, and all the battery cell groups 201 are electrically connected in series. The total negative pole of the first battery cell group 201 is respectively connected to the two sides of the distribution device 202, and the total positive pole of the last battery cell group 201 is connected to the right side of the distribution device 202, so that the lines connected in series with all the battery cell groups 201, the total positive poles and the total negative poles of all the battery cell groups and the distribution device 202 are arranged in order, avoiding interference between the lines, thereby increasing the operating stability of the battery cell group 201.

[0064] The power consumption system according to the embodiment of the third aspect of the utility model includes the battery pack 200 according to the embodiment of the second aspect of the utility model.

[0065] According to the power consumption system of the embodiment of the utility model, by adopting the above-mentioned battery pack 200, it is beneficial to improve the stability of power transmission of the power consumption system, improve the user experience, and thus enhance the market competitiveness of the power consumption system.

[0066] Other structures and operations of the battery pack 200 and the power system according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0067] In the description of the present invention, it should be understood that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "axial", "radial", "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 should not be understood as a limitation on the present invention.

[0068] 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.

[0069] 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.

[0070] 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 box, characterized in that: include: A pallet frame, wherein the top and the bottom of the pallet frame are both open, the pallet frame comprises a plurality of side beams and at least one limiting beam, the two ends of the limiting beam are respectively connected to the corresponding side beams, and the limiting beam extends along a first direction; A bottom plate, the bottom plate is connected to the bottom of the tray frame, the bottom plate and the tray frame together define a plurality of battery cell accommodating cavities, the plurality of battery cell accommodating cavities are arranged along a second direction, and the second direction is perpendicular to the first direction; Wherein, each of the battery cell accommodating chambers is suitable for communicating with the outside through an explosion-proof valve.

2. The battery box according to claim 1, characterized in that: One end of the side beam adjacent to the bottom plate has a first extension portion, the first extension portion is located on a side of the side beam adjacent to the limiting beam, the first extension portion extends in a direction toward the limiting beam, and the bottom plate abuts against the first extension portion.

3. The battery box according to claim 2, characterized in that: One end of the limiting beam adjacent to the bottom plate has a second extension portion, and the second extension portion extends toward the center of the battery cell accommodating cavity in the second direction, and the bottom plate abuts against the second extension portion.

4. The battery box according to any one of claims 1 to 3, characterized in that: Also includes: A liquid cooling plate is arranged on the top of the tray frame, and the liquid cooling plate is connected to the plurality of limit beams through fasteners.

5. The battery box according to claim 4, characterized in that: The limiting beam includes at least one connecting column and a plurality of connecting plates, the connecting column is located between two adjacent connecting plates, and the fastener passes through the liquid cooling plate and is connected to the connecting column.

6. The battery box according to claim 5, characterized in that: The thickness of the connecting plate in the second direction is smaller than the thickness of the connecting column.

7. The battery box according to claim 4, characterized in that: A heat-conducting adhesive is provided on one side of the liquid cooling plate adjacent to the tray frame.

8. The battery box according to claim 1, characterized in that: Also includes: A protection plate is arranged on a side of the bottom plate away from the pallet frame, and the protection plate shields the bottom of the pallet frame.

9. The battery box according to claim 8, characterized in that: Also includes: A plurality of fixing brackets are spaced apart along the circumference of the pallet frame, and each of the fixing brackets is connected to the edge beam and / or the protection plate.

10. The battery box according to claim 1, characterized in that: An exhaust hole communicating with the battery cell accommodating cavity is formed on the side beam, and the exhaust hole is suitable for installing the explosion-proof valve.

11. The battery box according to claim 1, characterized in that: There are multiple bottom plates, all of which are connected to the bottom of the tray frame, and the bottom plates are spaced apart along the second direction. Each bottom plate and the tray frame together define a battery cell accommodating cavity.

12. A battery pack, characterized in that: include: A battery box, wherein the battery box is a battery box according to any one of claims 1 to 11; A plurality of battery cell groups, each of which is arranged in a corresponding battery cell accommodating cavity of the battery box, and each of which includes a plurality of battery cells.

13. An electricity system, characterized in that: A battery pack comprising the battery pack of claim 12.

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