Battery box

Abstract

The utility model discloses a battery box. The battery box comprises a box body and a plurality of battery packs, wherein the box body comprises a plurality of structural beams and a bottom plate, the plurality of structural beams are arranged in a crossed manner and are respectively connected to the bottom plate, the box body is divided into a plurality of accommodating spaces by the plurality of structural beams, and one battery pack is arranged in one accommodating space; a windowing area is arranged on the side, facing the bottom plate, of each battery pack, an insulating part is arranged between the structural beam and the battery packs, and the insulating part abuts against the bottom plate; the height h of the insulating part, the distance A between the side wall of the battery pack and the adjacent structural beam and the distance a between the windowing area and the side wall of the battery pack meet the following condition: h + A + a is greater than or equal to 2mm and less than or equal to 20mm. The battery box provided by the utility model has good insulation performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium ion batteries, in particular to a battery box. BACKGROUND

[0002] A power battery is a storage battery for providing power for electric vehicles, electric trains, electric bicycles and the like. The power battery is usually composed of a plurality of battery modules. The battery modules are adhesively fixed to a box body. Since the battery modules are externally covered by a blue film for insulation, the adhesive strength of the battery modules to the box body is insufficient. The battery modules are prone to separation from the box body, which has a safety hazard. The adhesive strength of metal to the box body is greater than that of the blue film to the box body. Therefore, a window is usually opened at the bottom of the battery module to leak out the metal shell. The leaked metal shell is adhesively connected to the box body to improve the adhesive strength. However, when the metal shell in the windowed area is too close to the structural beam of the box body, an arc phenomenon is prone to occur, which causes damage to the battery module. SUMMARY

[0003] The battery box provided by the present application has good insulation performance and improves the reliability of the battery box.

[0004] The battery box provided by the present application comprises a box body and a plurality of battery modules. The box body comprises a plurality of structural beams and a bottom plate. The plurality of structural beams are crosswise arranged and connected to the bottom plate. The plurality of structural beams divide the box body into a plurality of accommodating spaces. One battery module is arranged in one accommodating space. Each battery module has a windowed area on the side facing the bottom plate. An insulating member is arranged between the structural beam and the battery module. The insulating member abuts against the bottom plate. The height h of the insulating member, the vertical distance A between the side wall of the battery module and the structural beam, and the vertical distance a between the windowed area and the side wall of the battery module satisfy the condition: 2mm≤h+A+a≤20mm.

[0005] In the above embodiment, the structural beams are mounted on the bottom plate of the box body to improve the structural strength of the box body. The structural beams can be crosswise arranged perpendicularly to each other. The battery module has a windowed area at the bottom. The windowed area exposes the metal shell of the battery module, which can improve the adhesive strength of the battery module to the bottom plate. At the same time, the windowed area can also improve the heat transfer efficiency. The structural beams are made of metal. An insulating member is arranged between the battery module and the structural beam. The height h of the insulating member, the vertical distance A between the side wall of the battery module and the structural beam, and the vertical distance a between the windowed area and the side wall of the battery module satisfy the condition: 2mm≤h+A+a≤20mm, which can prevent the windowed area from appearing an arc phenomenon and improve the safety of the battery box. BRIEF DESCRIPTION OF DRAWINGS

[0006] Figure 1 The top view structural schematic diagram of the battery box provided by one embodiment of the present application is shown in the figure;

[0007] Figure 2 A bottom view of a battery pack according to an embodiment of the present application;

[0008] Figure 3 An assembly view of a base plate, a structural beam, a battery pack and an insulating member according to an embodiment of the present application;

[0009] Figure 4 An assembly view of a base plate, a structural beam, a battery pack and an insulating member according to another embodiment of the present application;

[0010] Figure 5 A top assembly view of a battery pack and an insulating member according to an embodiment of the present application.

[0011] Reference numerals:

[0012] 1 - case; 2 - structural beam; 21 - first beam; 22 - second beam; 3 - base plate; 100 - accommodation space; 4 - battery pack; 40 - battery cell; 41 - windowed region; 401 - sub-windowed region; 5 - insulating member; 51 - first insulating plate; 52 - second insulating plate; 410 - second edge; 411 - third edge; 412 - fourth edge; 42 - first side wall; 43 - second side wall; 501 - first insulating member; 502 - second insulating member. DETAILED DESCRIPTION

[0013] In order to make the objects, technical solutions and advantages of the present application clearer, the following further describes the present application with reference to the accompanying drawings.

[0014] The terms used in the following embodiments are only for the purpose of describing particular embodiments and are not intended to be limiting of the present application. As used in the specification and the appended claims, the singular forms "a," "an" and "the" are intended to include both singular and plural forms, unless the context clearly indicates otherwise.

[0015] Reference to "one embodiment" or "an embodiment" or "the embodiment" or "the

[0016] In the related art, a blue film is an insulating material arranged outside a battery, mainly used to separate multiple batteries to prevent a single battery from affecting other batteries due to failure, and also used to prevent water and dust, so as to better protect the battery. The chemical composition of the blue film is mainly polyethylene terephthalate (PET), which has good insulation performance.

[0017] Figure 1 A top view structural schematic diagram of a battery box provided by an embodiment of the present application, Figure 2 A bottom view of a battery pack provided by an embodiment of the present application, Figure 3 An assembly view of a bottom plate, a structural beam, a battery pack and an insulating piece provided by an embodiment of the present application. As Figures 1-3 shown, the battery box provided by the embodiment of the present application includes a box body 1 and multiple battery packs 4. The box body 1 includes multiple structural beams 2 and a bottom plate 3. The multiple structural beams 2 are arranged in a cross shape and are fixedly connected to the bottom plate 3. The multiple structural beams 2 separate the box body 1 into multiple accommodation spaces 100. One battery pack 4 is arranged in one accommodation space 100. Each battery pack 4 is provided with a windowed area 41 on the side facing the bottom plate 3. An insulating piece 5 is arranged between the structural beam 2 and the battery pack 4, and the insulating piece 5 abuts against the bottom plate 3. The height h of the insulating piece 5, the distance A between the side wall of the battery pack 4 and the structural beam 2, and the distance a between the windowed area 41 and the side wall of the battery pack 4 satisfy the following relationship: 2mm≤h+A+a≤20mm.

[0018] In the above embodiment, the multiple structural beams 2 are fixedly connected to the bottom plate 3 of the box body 1 to improve the structural strength of the box body 1. The structural beams 2 can be welded to the bottom plate 3, or the structural beams 2 can be integrally formed with the bottom plate 3. The multiple structural beams 2 can be arranged in a perpendicular cross shape. The battery pack 4 is provided with a windowed area 41 at the bottom, which exposes the metal shell of the battery pack and can improve the bonding strength between the battery pack 4 and the bottom plate 3. At the same time, the bottom plate 3 of the box body 1 can be integrated with a cold plate, so that the windowed area 41 can also improve the heat transfer efficiency.

[0019] In the direction perpendicular to the bottom plate 3, the height of the insulating piece 5 is h. In the horizontal direction, the vertical distance between the side wall of the battery pack 4 and the adjacent structural beam 2 is A. The vertical distance between the periphery of the windowed area 41 and the side wall of the battery is a. h, A and a satisfy the following relationship: 2mm≤h+A+a≤20mm. The structural beam 2 is made of metal. The insulating piece 5 is arranged between the battery pack 4 and the structural beam 2, and h+A+a satisfies the above numerical relationship, which can prevent the windowed area 41 and the structural beam 2 from appearing arc phenomenon, and improve the safety of the battery box. The value of h+A+a may be, for example, 2mm, 6mm, 10mm, 14mm, 18mm, 20mm, etc., but is not limited to these values.

[0020] It is worth noting that, Figure 1Two battery packs 4 are shown as being mounted in the box. In actual applications, a battery pack 4 is mounted in each accommodation space 100.

[0021] As shown in Figure 2 , the battery pack 4 is composed of a plurality of square battery cells 40, which can be arranged in a square array. The number of rows and columns of the battery cells 40 is not specifically limited in the present application. The shell of each battery cell 40 is made of metal. The exterior of each battery cell 40 is covered with a blue film, which separates adjacent battery cells 40. The bottom of each battery cell 40 is provided with a sub-window area 401. Therefore, the window area 41 Figure 2 (in the dashed box part) is composed of a plurality of sub-window areas 401 of the battery cells 40. When bonding, the entire window area 41 (including the positions of the blue film inside the window area 41 and the positions of the sub-window areas 401) can be coated with structural adhesive and bonded to the bottom plate 3.

[0022] In a specific embodiment, the vertical distance A between the side wall of the battery pack 4 and the structural beam 2 satisfies: 1mm<A<5mm. For example, A can be 1.5mm, 2mm, 3mm, 4mm, 4.5mm, etc., but is not limited to these values.

[0023] In a further embodiment, the height h of the insulating member 5 in the direction perpendicular to the bottom plate 3, the vertical distance A between the side wall of the battery pack 4 and the structural beam 2, and the distance a between the window area 41 and the battery side wall satisfy: 8mm≤h+A+a≤15mm. The value of h+A+a satisfies the above relationship, which can not only meet the insulation requirement, but also reduce the influence of heat exchange between the battery pack 4 and the structural beam 2. For example, h+A+a can be 8mm, 9mm, 12mm, 13mm, 15mm, etc., but is not limited to these values.

[0024] Because the battery box has complex working conditions when in use, it may vibrate and jolt. When the insulating member 5 causes a gap between the bottom plate 3 of the box 1 due to vibration and other factors, there is a risk of insulation failure. To solve the above problem, Figure 4 The assembly drawing of the bottom plate, the structural beam, the battery pack and the insulating member provided for another embodiment of the present application is shown in Figure 4As shown, in one embodiment, the insulation member 5 can be provided in an L shape, including a first insulation plate 51 and a second insulation plate 52 connected to each other, the first insulation plate 51 being located between the structural beam 2 and the battery pack 4. The second insulation plate 52 is bonded to the bottom plate 3, and at least part of the second insulation plate 52 is located between the bottom plate 3 and the battery pack. The second insulation plate 52 not only increases the insulation area, but also reduces the gap between the second insulation plate 52 and the bottom plate 3, thereby improving the safety of the battery box.

[0025] With reference to the foregoing Figure 4 , the second insulation plate 52 includes a first edge and a second edge 410 arranged opposite to each other, the edge connected to the first insulation plate 51 being the first edge, and the vertical distance d between the second edge 410 and the first edge satisfying 0mm < d < 20mm. This can not only improve the reliability of insulation, but also weaken the influence on heat dissipation at the bottom of the battery pack 4. For example, d can be 1mm, 5mm, 9mm, 13mm, 17mm, 19mm, etc., but is not limited to these values.

[0026] Figure 5 A top view assembly diagram of the battery pack and the insulation member is provided for one embodiment of the present application. As shown in Figure 5 , in a further embodiment, the vertical projection of the second insulation plate 52 on the bottom plate 3 at least partially overlaps the vertical projection of the windowed area 41 on the bottom plate 3. The length of the overlap b is not greater than 3mm. This can reduce the decline in insulation reliability caused by the second insulation plate 52 covering too small an area of the windowed area 41. For example, b can be 1mm, 1.5mm, 2mm, 2.5mm, 2.8mm, etc., but is not limited to these values. Since the battery pack 4 is a square battery pack, the windowed area 41 is also square, and b includes b1 and b2, where b1 and b2 can be equal.

[0027] With reference to the foregoing Figure 5In an embodiment, the vertical distance a between the windowed region 41 and the side wall of the battery pack 4 satisfies 3mm≤a≤5mm. The battery pack 4 is a square battery pack, and the windowed region 41 is also square. The distance a between the edge of the windowed region 41 and the side wall of the battery pack 4 includes a1 and a2. Specifically, the windowed region 41 includes a third edge 411 and a fourth edge 412 connected to each other, and the battery pack 4 includes a first side wall 42 and a second side wall 43 connected to each other, the third edge 411 is parallel to the first side wall 42, and the fourth edge 412 is parallel to the second side wall 43. The vertical distance between the third edge 411 and the first side wall 42 is a1, and the vertical distance between the fourth edge 412 and the second side wall 43 is a2, a1 can be equal to a2, and both are equal to a. For example, a can be 3mm, 4mm, 5mm, etc., but is not limited to these values. The vertical distance a between the windowed region 41 and the side wall of the battery pack 4 satisfies the above range, which can make the battery pack 4 more firmly bonded to the box 1

[0028] In an embodiment, the insulating member 5 is fixedly connected to the structural beam 2, and the height h of the insulating member 5 in the direction perpendicular to the bottom plate 3 satisfies 0mm≤h≤130mm, so that the insulating member 5 has good insulation performance, and can also make the battery monomer have good heat dissipation effect, and can also be reliably connected with the fixed beam.

[0029] In an embodiment, the insulating member 5 can be an insulating film or an insulating plate.

[0030] In an embodiment, the insulating member 5 is fixedly connected to the structural beam 2. Specifically, the first insulating plate 51 of the insulating member 5 can be fixedly connected to the first beam 21 or the second beam 22 by gluing or the like, and the battery pack 4 can be arranged with a gap or in close contact with the first insulating plate 51.

[0031] Please continue to refer to Figure 5 and Figure 1 , Figure 5 It is shown that the insulating member is arranged on three side walls of the battery pack. In this embodiment, the battery pack 4 is arranged in the accommodating space in the middle of the box, as shown in Figure 1The insulation member 5 is located on the right side of the battery pack. The insulation member 5 includes a first insulation member 501 and a second insulation member 502. The first insulation member 501 is fixedly connected with the first beam 21, and the second insulation member 502 is fixedly connected with the second beam 22. Specifically, the battery box 1 can include two first beams 21 and one second beam 22. The two first beams 21 are arranged in parallel and are perpendicular to the second beam 22, thereby dividing the box 1 into six accommodating spaces 100. The accommodating space 100 located at the edge of the box 1 contains one first beam 21 and one second beam 22. The accommodating space 100 located at the middle of the box 1 contains two first beams 21 and one second beam 22. Taking the middle accommodating space 100 as an example, the middle accommodating space 100 is provided with two first insulation members 501 and one second insulation member 502. The two first insulation members 501 are oppositely arranged and are connected with the second insulation member 502, thereby forming a "N" shaped insulation member 5 from the direction perpendicular to the bottom plate, as shown by the thick line portion of Figure 5 The first insulation member 501 and the second insulation member 502 in each of the above-mentioned accommodating spaces 100 can be an integral structure, thereby facilitating assembly.

[0032] Taking the accommodating space 100 located at the edge of the box 1 as an example, the accommodating space 100 contains one first beam 21 and one second beam 22. The accommodating space 100 is provided with one first insulation member 501 and one second insulation member 502. The first insulation member 501 is connected with the second insulation member 502, thereby forming an L-shaped insulation member 5 from the direction perpendicular to the bottom plate, as shown by the thick line portion of Figure 1 The insulation member located on the left side of the battery pack.

[0033] In other embodiments, the number of structural beams 2 is not limited to the number in the above-mentioned embodiments, but can be less or more. If the four sides of the accommodating space 100 are all structural beams 2, the accommodating space 100 should be provided with two first insulation members 501 and two second insulation members 502. The two first insulation members 501 and the two second insulation members 502 are connected to form a "K" shaped insulation member 5 from the direction perpendicular to the bottom plate

[0034] Obviously, persons having ordinary skill in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the present application claims and their equivalents, then the present application is also intended to include these modifications and variations.

Claims

1. A battery box characterized by, The battery pack comprises a box and a plurality of battery groups, wherein, the box comprises a plurality of structural beams and a bottom plate, the plurality of structural beams are arranged in a cross shape and are connected to the bottom plate respectively, the plurality of structural beams divide the box into a plurality of accommodating spaces, and one battery group is arranged in one accommodating space; each battery group has a windowed area on a side facing the bottom plate, an insulating member is arranged between the structural beam and the battery group, and the insulating member abuts against the bottom plate; a height h of the insulating member, a distance A between a side wall of the battery group and the adjacent structural beam, and a distance a between the windowed area and the side wall of the battery group satisfy 2mm≤h+A+a≤20mm.

2. The battery pack of claim 1, wherein, a height h of the insulating member, a distance A between a side wall of the battery group and the adjacent structural beam, and a distance a between the windowed area and the side wall of the battery group satisfy 8mm≤h+A+a≤15mm.

3. The battery pack of claim 1, wherein, the insulating member is L-shaped and comprises a first insulating plate and a second insulating plate connected to each other, the first insulating plate is arranged between the structural beam and the battery group, the second insulating plate abuts against the bottom plate, and at least part of the second insulating plate is arranged between the bottom plate and the battery group; the second insulating plate comprises a first edge and a second edge arranged opposite to each other, the first edge is connected to the first insulating plate, and a perpendicular distance d between the second edge and the first edge satisfies 0mm<d<20mm.

4. The battery pack of claim 3, wherein, a vertical projection of the second insulating plate on the bottom plate at least partially overlaps a vertical projection of the windowed area on the bottom plate, and an overlapping length b is not greater than 3mm.

5. The battery pack of claim 4, wherein, a vertical distance a between the windowed area and the side wall of the battery group satisfies 3mm≤a≤5mm.

6. The battery pack of claim 1, wherein, a height h of the insulating member in a direction perpendicular to the bottom plate satisfies 0mm≤h≤130mm.

7. The battery pack of claim 1, wherein, the structural beam comprises a first beam and a second beam, and the first beam and the second beam are perpendicular to each other.

8. The battery pack according to any one of claims 1 to 7, characterized by the battery group comprises a plurality of battery monomers arranged in an array, and each battery monomer has a sub-windowed area.

9. The battery pack of claim 1, wherein, the insulating member is an insulating film or an insulating plate.

10. The battery pack of claim 1, wherein, the insulating member is fixedly connected to the structural beam.

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