Battery box body, battery pack and power utilization device

Abstract

The utility model provides a battery box body, a battery pack and an electric device, and relates to the technical field of batteries. The battery box body comprises a box body frame and a box body bottom plate, a containing cavity used for containing single batteries is formed between the box body frame and the box body bottom plate, the box body bottom plate comprises a first plate piece and a second plate piece which are oppositely arranged in a spaced mode, and a plurality of reinforcing ribs are connected between the first plate piece and the second plate piece in an abutting mode. The reinforcing ribs extend in the second direction and are arranged at intervals in the first direction, a gap between the first plate and the second plate forms a plurality of exhaust channels through the reinforcing ribs, and a plurality of first exhaust holes communicated with the exhaust channels are formed in the positions, corresponding to the exhaust channels, of the second plate. The battery box body can improve the space utilization rate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery box, a battery pack and an electric device. BACKGROUND

[0002] With the increase of the power demand of the battery system, the number of battery monomers in the battery pack also gradually increases, thereby causing the risk of heat spread to rise. When a single battery monomer is in thermal runaway, the ejecta needs to be quickly discharged to prevent the battery pack from catching fire and exploding.

[0003] The existing treatment for the thermal runaway of the battery monomer is to set a separate exhaust component at the bottom of the battery box to exhaust. However, the separate exhaust component has a large number of parts and occupies a large space, thereby reducing the space utilization of the battery box. CONTENT OF THE UTILITY MODEL

[0004] The present application aims to, for example, provide a battery box, a battery pack and an electric device, which can improve the space utilization.

[0005] The embodiments of the present application can be implemented as follows:

[0006] In a first aspect, the embodiments of the present application provide a battery box, which comprises a box frame and a box bottom plate. A containing cavity for accommodating battery monomers is formed between the box frame and the box bottom plate. The box bottom plate comprises a first plate and a second plate arranged opposite to each other. A plurality of reinforcing ribs are abutted between the first plate and the second plate. The plurality of reinforcing ribs extend along a second direction and are arranged at intervals along a first direction. The gap between the first plate and the second plate forms a plurality of exhaust channels through the plurality of reinforcing ribs. A plurality of first exhaust holes are formed in the second plate corresponding to the position of each exhaust channel and are in communication with the exhaust channels.

[0007] Optionally, the first plate is provided with a first connecting portion at both ends along the first direction. The first connecting portion extends towards the second plate and is connected with the second plate.

[0008] Along the first direction, the thickness of the first connecting portion is greater than the thickness of the reinforcing rib.

[0009] Optionally, the number of the first plates is a plurality. The plurality of first plates are arranged in sequence along the first direction. The first connecting portions of the adjacent two first plates are welded. The first connecting portions located at the outermost sides along the first direction are welded with the box frame.

[0010] Optionally, each of the reinforcing ribs is provided with a second connecting portion facing the surface of the second plate member, and the second connecting portion is welded to the second plate member, and each of the reinforcing ribs and the corresponding second connecting portion integrally forms a T-shaped structure.

[0011] Optionally, the box frame comprises two first side beams arranged opposite to each other along the first direction and two second side beams arranged opposite to each other along the second direction; at least one of the second side beams is internally provided with an exhaust cavity, and a plurality of exhaust passages are respectively connected to the exhaust cavity, and the second side beam is provided with an exhaust valve connected to the exhaust cavity.

[0012] Optionally, the second plate member is provided with an insulating layer on the side away from the first plate member, and the insulating layer is provided with an adhesive layer for bonding the battery monomers, and the insulating layer and the adhesive layer are provided with through holes or thinned areas corresponding to the positions of each of the first exhaust holes.

[0013] Optionally, the first plate member is provided with a fireproof layer on the side facing the second plate member.

[0014] In a second aspect, the application further provides a battery pack comprising a plurality of battery monomers and the battery box, the plurality of battery monomers are arranged on the second plate member, and the explosion-proof valves on the plurality of battery monomers correspond one-to-one to the positions of the plurality of first exhaust holes.

[0015] Optionally, the battery box is provided with a partition plate, the partition plate divides the accommodating cavity into a battery cavity and an electrical cavity, the plurality of battery monomers are arranged in the battery cavity, and an electrical module is arranged in the electrical cavity.

[0016] In a third aspect, the application further provides a power consumption device comprising the battery pack.

[0017] The battery box, the battery pack and the electric device provided by the embodiments of the present application have the following beneficial effects, for example: in order to improve the space utilization, a battery box is designed, the battery box comprises a box frame and a box bottom plate, a containing cavity for accommodating battery monomers is formed between the box frame and the box bottom plate, the box bottom plate comprises a first plate and a second plate which are arranged in opposite directions, a plurality of reinforcing ribs are arranged between the first plate and the second plate, the plurality of reinforcing ribs extend along a second direction and are arranged in a first direction, a gap between the first plate and the second plate forms a plurality of exhaust channels through the plurality of reinforcing ribs, and a plurality of first exhaust holes are formed in the second plate and correspond to the positions of the exhaust channels. By directly arranging the box bottom plate to comprise the first plate and the second plate, the plurality of reinforcing ribs are arranged between the first plate and the second plate, the exhaust channel is formed between the first plate, the second plate and the adjacent two reinforcing ribs, and the first exhaust hole is formed in the second plate and corresponds to the position of each exhaust channel, when the battery monomers in the battery box need to be exhausted due to thermal runaway, the gas can be directly exhausted through each exhaust channel in time, compared with arranging a separate exhaust component at the bottom of the battery box, the battery box saves space and improves the space utilization of the battery box. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced below, and it should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0019] Figure 1 The structure schematic diagram of the battery pack (without covering the box cover) in the embodiments of the present application is shown in FIG. 1.

[0020] Figure 2 The structure schematic diagram of the battery box in the embodiments of the present application is shown in FIG. 2.

[0021] Figure 3 The structure schematic diagram of the box bottom plate from a first perspective in the embodiments of the present application is shown in FIG. 3.

[0022] Figure 4 The enlarged view of part A in FIG. 3 is shown in FIG. 4. Figure 3 The enlarged view of part B in FIG. 3 is shown in FIG. 5.

[0023] Figure 5 The enlarged view of part C in FIG. 3 is shown in FIG. 6. Figure 3 The enlarged view of part D in FIG. 3 is shown in FIG. 7.

[0024] Figure 6 The structure schematic diagram of the box bottom plate from a second perspective in the embodiments of the present application is shown in FIG. 8.

[0025] Figure 7It is a partial structure schematic view of the battery box in the embodiments of the present application.

[0026] Icon: 10-battery pack; 100-battery box; 110-first side beam; 120-second side beam; 121-exhaust cavity; 122-exhaust valve; 123-second exhaust hole; 130-box bottom plate; 131-first plate; 1311-first connecting part; 1312-fireproof layer; 132-second plate; 1321-first exhaust hole; 1322-insulating layer; 1323-adhesive layer; 133-stiffener; 1331-second connecting part; 134-exhaust passage; 140-baffle; 150-battery cavity; 160-electric cavity; 200-battery monomer. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0028] Therefore, the detailed description of the embodiments of the present application provided below in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts fall within the scope of protection of the present application.

[0029] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0030] In the description of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship of the utility model product in use, only for the convenience of describing the present application and simplifying the description, and not to indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application.

[0031] In addition, if the terms "first", "second" and the like appear, they are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0032] It should be noted that the features in the embodiments of the present application can be combined with each other without conflict.

[0033] The inventor of the present application finds that the existing treatment of thermal runaway of battery monomers is generally through the setting of a separate exhaust component at the bottom of the battery box to exhaust, and the separate exhaust component has a large number of components, occupies a large internal space of the battery box, and reduces the space utilization of the battery box. The embodiments of the present application provide a battery pack at least for solving the technical problem.

[0034] For reference Figures 1-3 The embodiments of the present application provide a battery pack 10, which comprises a plurality of battery monomers 200 and a battery box 100, the battery box 100 comprises a box frame and a box bottom plate 130, a containing cavity for accommodating the battery monomers 200 is formed between the box frame and the box bottom plate 130, the box bottom plate 130 comprises a first plate 131 and a second plate 132 which are oppositely arranged, a plurality of reinforcing ribs 133 are abutted between the first plate 131 and the second plate 132, the plurality of reinforcing ribs 133 extend along a second direction y and are arranged at intervals along a first direction x, a gap between the first plate 131 and the second plate 132 forms a plurality of exhaust channels 134 through the plurality of reinforcing ribs 133, and a plurality of first exhaust holes 1321 which are communicated with the exhaust channels 134 are formed in the second plate 132 at positions corresponding to each of the exhaust channels 134.

[0035] It should be noted that the reinforcing ribs 133 are arranged on the first plate 131, extend towards the second plate 132 and abut against the second plate 132; the first plate 131, the second plate 132 and two adjacent reinforcing ribs 133 form an exhaust channel 134.

[0036] The plurality of battery monomers 200 are arranged on the second plate 132, the explosion-proof valves on the plurality of battery monomers 200 correspond one-to-one to the positions of the plurality of first exhaust holes 1321, when thermal runaway occurs in any of the battery monomers 200, the gas sprayed by the explosion-proof valve of the battery monomer 200 is exhausted into the exhaust channel 134 through the corresponding first exhaust hole 1321.

[0037] By directly arranging the box bottom plate 130 to comprise the first plate 131 and the second plate 132, the plurality of reinforcing ribs 133 are abutted between the first plate 131 and the first plate 131, the first plate 131, the second plate 132 and two adjacent reinforcing ribs 133 form an exhaust channel 134, and the first exhaust hole 1321 is formed in the second plate 132 at a position corresponding to each of the exhaust channels 134, when the battery monomers 200 in the battery box 100 need to be exhausted due to thermal runaway, the gas can be directly exhausted in time through each of the exhaust channels 134, compared with the setting of a separate exhaust component at the bottom of the battery box 100, the battery box 100 saves space and improves the space utilization of the battery box 100.

[0038] AsFigure 4 As shown, the first plate member 131 is provided with a first connecting portion 1311 at both ends along the first direction x, the first connecting portion 1311 extends towards the second plate member 132 and is connected with the second plate member 132; along the first direction x, the thickness of the first connecting portion 1311 is greater than the thickness of the reinforcing rib 133.

[0039] The first connecting portion 1311 can play a role of connecting and supporting the second plate member 132, by limiting the thickness of the first connecting portion 1311 along the first direction x to be greater than the thickness of the reinforcing rib 133, the second plate member 132 can be more stably supported. The first plate member 131, the second plate member 132, the first connecting portion 1311 and one of the reinforcing ribs 133 form an exhaust passage 134.

[0040] The number of the first plate member 131 is multiple, multiple first plate members 131 are sequentially arranged along the first direction x, the first connecting portions 1311 of the adjacent two first plate members 131 are welded, and the two first connecting portions 1311 located at the outermost side of the first direction x are welded with the cabinet frame.

[0041] By sequentially arranging multiple first plate members 131 along the first direction x, and welding the first connecting portions 1311 of the adjacent two first plate members 131, the multiple first plate members 131 form an integral whole, and welding the two first connecting portions 1311 located at the outermost side of the first direction x with the cabinet frame, the integral whole formed by welding the multiple first plate members 131 is connected with the cabinet frame as a whole.

[0042] It can be understood that when the number of the first plate member 131 is one, the two first connecting portions 1311 on the first plate member 131 are welded with the cabinet frame.

[0043] As shown in Figure 4 Each reinforcing rib 133 is provided with a second connecting portion 1331 on the surface facing the second plate member 132, the second connecting portion 1331 is welded with the second plate member 132, and each reinforcing rib 133 and the corresponding second connecting portion 1331 integrally form a T-shaped structure.

[0044] Each reinforcing rib 133 and the corresponding second connecting portion 1331 are integrally formed, and since each reinforcing rib 133 and the corresponding second connecting portion 1331 integrally form a T-shaped structure, the surface of the second connecting portion 1331 away from the reinforcing rib 133 is in close contact with the second plate member 132, the contact area between the second connecting portion 1331 and the second plate member 132 is larger, and after welding the second connecting portion 1331 with the second plate member 132, it is not easy to appear the welding failure, thereby enabling the second plate member 132 to be stably connected with the first plate member 131.

[0045] In some embodiments, the box frame includes two first side beams 110 arranged opposite to each other along a first direction x and two second side beams 120 arranged opposite to each other along a second direction y; an exhaust cavity 121 is provided inside at least one second side beam 120, and multiple exhaust channels 134 are respectively connected to the exhaust cavity 121, and an exhaust valve 122 connected to the exhaust cavity 121 is provided on the second side beam 120.

[0046] Please refer to Figure 6 、 Figure 7 A second exhaust hole 123 communicating with the exhaust cavity 121 is provided on the second side beam 120 provided with the exhaust cavity 121. The length of the second plate 132 in the second direction y is shorter than that of the first plate 131, so that the high-temperature gas can be discharged into the exhaust cavity 121 upward through the second exhaust hole 123 at the end of the second plate 132 which is shorter than the first plate 131. No hole is required here, which reduces the manufacturing cost; the exhaust valve 122 is installed on the side of the second side beam 120 away from the battery cell 200 and is communicated with the exhaust cavity 121, so that the gas in the exhaust cavity 121 can be discharged out of the battery box 100 through the exhaust valve 122 in time.

[0047] When the gas generated by the battery cell 200 during thermal runaway is discharged into the exhaust channel 134, the high-temperature gas can be discharged into the exhaust cavity 121 through the second exhaust hole 123 and finally discharged through the exhaust valve 122 on the second side beam 120, effectively reducing the impact of thermal runaway.

[0048] The first side beam 110 and the box bottom plate 130 as well as the second side beam 120 and the box bottom plate 130 are sealed. Optionally, the first side beam 110 and the box bottom plate 130 as well as the second side beam 120 and the box bottom plate 130 are welded via a first connecting portion 1311 .

[0049] like Figure 5 As shown, an insulating layer 1322 is provided on the side of the second plate 132 away from the first plate 131, and an adhesive layer 1323 for bonding the battery cell 200 is provided on the insulating layer 1322. The insulating layer 1322 and the adhesive layer 1323 are provided with through holes or thinning areas corresponding to the position of each first exhaust hole 1321.

[0050] The adhesive layer 1323 covers the surface of the insulating layer 1322 away from the second plate 132. When the insulating layer 1322 and the adhesive layer 1323 are provided with a through hole at the position corresponding to each first exhaust hole 1321, the through hole matches the shape of the first exhaust hole 1321; when the insulating layer 1322 and the adhesive layer 1323 are provided with a thinning area at the position corresponding to each first exhaust hole 1321, the thickness of the insulating layer 1322 and the adhesive layer 1323 located in the thinning area is thinner, and the gas generated by the explosion-proof valve on the battery cell 200 can quickly break through the portion of the insulating layer 1322 and the adhesive layer 1323 located in the thinning area, thereby discharging the gas from the exhaust channel 134 in time.

[0051] The projected area of ​​the insulating layer 1322 in the direction perpendicular to the second plate 132 is larger than the projected area of ​​all battery cells 200 in the direction perpendicular to the second plate 132 . When all battery cells 200 are bonded to the adhesive layer 1323 , the insulating layer 1322 can provide better insulation.

[0052] like Figure 4 As shown, a fireproof layer 1312 is provided on the side of the first plate 131 facing the second plate 132 .

[0053] The fireproof layer 1312 is made of fireproof material, which can be gypsum board, flame retardant coating or flame retardant plastic stool. By arranging the fireproof layer 1312 on the side of the first plate 131 facing the second plate 132, it is prevented that high temperature gas melts through the bottom of the box and produces open flames.

[0054] like Figure 1 As shown, a partition 140 is provided in the battery box 100 , and the partition 140 divides the accommodating cavity into a battery cavity 150 and an electrical cavity 160 . Multiple battery cells 200 are located in the battery cavity 150 , and an electrical module is provided in the electrical cavity 160 .

[0055] Multiple battery cells 200 are bonded to adhesive layer 1323, securing them within battery cavity 150. Electrical modules include, but are not limited to, electrical connection modules, thermal management systems, or battery management systems. A partition 140 separates the accommodating cavity into battery cavity 150 and electrical cavity 160, minimizing the risk of thermal runaway of the battery cells 200 from affecting the electrical modules within cavity 160.

[0056] The embodiments of the present application also provide an electrical device including the aforementioned battery pack 10. For example, the electrical device may be a vehicle, a ship, a spacecraft, or the like. A vehicle may be a fuel-powered vehicle or a new energy vehicle. A new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. Spacecraft include aircraft, rockets, space shuttles, and spacecraft. The embodiments of the present application do not impose any particular limitations on the electrical devices described above.

[0057] The technical effects of the battery box 100, the battery pack 10 and the electric device provided by the embodiments of the present application at least include: the box bottom plate 130 is provided as including the first plate member 131 and the second plate member 132, the exhaust passage 134 is formed by the first plate member 131, the second plate member 132 and the reinforcing ribs 133, the first exhaust hole 1321 on the second plate member 132 is formed by stamping, the time for opening the hole is saved, and the manufacturing cost of the battery box 100 is reduced; the first plate member 131 and the second plate member 132 are arranged at intervals, the fireproof layer 1312 is arranged on the surface of the first plate member 131 facing the second plate member 132, and the high-temperature gas is prevented from melting through the bottom of the box to produce an open flame; the exhaust passage 134 is integrated into the box bottom plate 130, and the space utilization rate of the battery box 100 in the height direction is improved; the explosion-proof valve of the battery monomer 200 and the exhaust passage 134 are arranged at the bottom of the battery pack 10, and the electrical connection is arranged at the top of the battery pack 10, the thermal and electrical separation is realized, and the thermal safety of the battery pack 10 is improved.

[0058] In summary, the embodiments of the present application provide a battery box 100, a battery pack 10 and an electric device, by arranging the box bottom plate 130 as including the first plate member 131 and the second plate member 132, the first plate member 131 and the first plate member 131 abut against a plurality of reinforcing ribs 133, the first plate member 131, the second plate member 132 and the reinforcing ribs 133 form an exhaust passage 134, the second plate member 132 is provided with a first exhaust hole 1321 at a position corresponding to each exhaust passage 134, when the battery monomer 200 in the battery box 100 occurs thermal runaway and needs to be exhausted, the gas can be directly exhausted through each exhaust passage 134 to the exhaust chamber 121 in the second side beam 120 and discharged through the exhaust valve 122, compared with arranging a separate exhaust component at the bottom of the battery box 100, the battery box 100 saves space and improves the space utilization rate of the battery box 100.

[0059] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A battery case comprising a case frame and a case bottom plate (130), a housing cavity for accommodating a battery cell (200) being formed between the case frame and the case bottom plate (130), characterized in that, The box bottom plate (130) comprises a first plate member (131) and a second plate member (132) arranged opposite to each other, a plurality of reinforcing ribs (133) are abutted between the first plate member (131) and the second plate member (132), the plurality of reinforcing ribs (133) extend along the second direction and are arranged opposite to each other along the first direction, and gaps between the first plate member (131) and the second plate member (132) form a plurality of exhaust channels (134) through the plurality of reinforcing ribs (133), and the second plate member (132) is provided with a plurality of first exhaust holes (1321) corresponding to the positions of the exhaust channels (134) and communicating with the exhaust channels (134).

2. The battery pack of claim 1, wherein, The first plate member (131) is provided with a first connecting portion (1311) at both ends along the first direction, the first connecting portion (1311) extends towards the second plate member (132) and is connected with the second plate member (132). The thickness of the first connecting portion (1311) is greater than the thickness of the reinforcing rib (133) along the first direction.

3. The battery pack of claim 2, wherein, The number of the first plate members (131) is a plurality, the plurality of first plate members (131) are arranged in sequence along the first direction, the first connecting portions (1311) of two adjacent first plate members (131) are welded, and the two first connecting portions (1311) located at the outermost sides of the first direction are welded with the box frame.

4. The battery pack of claim 1, wherein, The surface of each reinforcing rib (133) towards the second plate member (132) is provided with a second connecting portion (1331), the second connecting portion (1331) is welded with the second plate member (132), and each reinforcing rib (133) and the corresponding second connecting portion (1331) integrally form a T-shaped structure.

5. The battery pack of claim 1, wherein, The box frame comprises two first side beams (110) arranged opposite to each other along the first direction and two second side beams (120) arranged opposite to each other along the second direction, at least one of the second side beams (120) is provided with an exhaust cavity (121) in the inside, the plurality of exhaust channels (134) respectively communicate with the exhaust cavity (121), and the second side beam (120) is provided with an exhaust valve (122) communicating with the exhaust cavity (121).

6. The battery pack of claim 1, wherein, The side of the second plate member (132) away from the first plate member (131) is provided with an insulating layer (1322), the insulating layer (1322) is provided with a bonding layer (1323) for bonding a battery monomer (200), and the insulating layer (1322) and the bonding layer (1323) are provided with through holes or thinned areas corresponding to the positions of each first exhaust hole (1321).

7. The battery pack of any one of claims 1-6, wherein, The side of the first plate member (131) towards the second plate member (132) is provided with a fireproof layer (1312).

8. A battery pack, characterized by, The battery box (100) according to any one of claims 1-7, wherein a plurality of battery monomers (200) are arranged on the second plate (132), and the explosion-proof valves on the plurality of battery monomers (200) correspond to the plurality of first exhaust holes (1321) one by one.

9. The battery pack of claim 8, wherein, The battery box (100) is provided with a partition plate (140), the partition plate (140) divides the accommodating cavity into a battery cavity (150) and an electrical cavity (160), the plurality of battery monomers (200) are located in the battery cavity (150), and the electrical cavity (160) is provided with an electrical module.

10. An electrical device, characterized by The battery pack (10) according to claim 8 or 9.

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