Battery pack and electric equipment

Abstract

The utility model relates to a battery pack and electric equipment. The battery pack comprises a bottom frame, a sealant layer and a bottom protection plate; layer and bottom guard plates; the bottom frame comprises a surrounding frame and a plurality of supporting plates, the multiple supporting plates are arranged in the space surrounded by the surrounding frame at intervals in the first direction, and the two ends, in the second direction, of the supporting plates are connected to the surrounding frame; the sealing glue layer is located between the bottom frame and the bottom protection plate, and the portion, located between the supporting plate and the bottom protection plate, of the sealing glue layer is discontinuous in the second direction, so that the spaces, on the two sides of the first direction, of the supporting plate are communicated. And when liquid leakage occurs in the battery pack, the liquid is finally distributed to the whole battery pack liquid from the discontinuous sealant layers, so that the liquid level height is reduced, and the risk of short circuit of the battery cells caused by contact of the liquid with the battery cells is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery pack and an electrical device. Background Art

[0002] With the increasing popularity of electric vehicles, the safety performance of battery packs, as the core components of electric vehicles, has become one of the factors that people are most concerned about. For battery packs, a temperature control system is usually installed inside the battery to ensure the stability of the working environment of the battery pack. Common ones are liquid cooling and air cooling. Among them, air cooling uses low-temperature air as a medium and uses cold air to contact the battery surface for heat exchange, thereby reducing the temperature of the battery. The air cooling system has a relatively simple structure, relatively mature technology, and low cost. However, due to the low thermal conductivity of air, the amount of heat that can be taken away is limited, the heat exchange efficiency is low, and it is easy to cause uneven temperature inside the power battery. Liquid cooling is a heat dissipation method that uses liquid convection heat exchange to take away the heat generated by the power battery and reduce the temperature of the power battery.

[0003] At present, power batteries mainly use indirect liquid cooling, that is, the battery module is cooled by setting up a liquid cooling plate. However, for battery packs equipped with a liquid cooling system, once the coolant leaks, the leaked coolant is very likely to come into contact with the electrical components in the battery pack, causing safety problems for the battery pack.

[0004] Therefore, this field needs a new technical solution to solve the above problems. Utility Model Content

[0005] In order to solve the technical problem in the prior art that the leaked coolant in the battery pack cannot be safely discharged.

[0006] To this end, in a first aspect, the utility model provides a battery pack, comprising a bottom frame (1), a sealing layer (2), and a bottom guard plate (3); the bottom frame (1) comprises a surrounding frame (11) and a plurality of support plates (12), the plurality of support plates (12) being arranged at intervals along a first direction in a space surrounded by the surrounding frame (11), and the two ends of the support plates (12) in a second direction are connected to the surrounding frame (11); the sealing layer (2) is located between the bottom frame (1) and the bottom guard plate (3), wherein the sealing layer (2) between the support plate (12) and the bottom guard plate (3) is discontinuous in the second direction, so that the space on both sides of the support plate (12) in the first direction is connected.

[0007] In the optional technology of the present invention, the support plate includes: a connection area and an exhaust area, and the exhaust area is provided with exhaust holes; the sealant layer includes a first area and a second area, the first area is opposite to the connection area, and the second area is opposite to the exhaust area.

[0008] In an optional technology of the present utility model, the area of ​​the first region is larger than 80% of the connection region.

[0009] In an optional technology of the present invention, the second area includes a plurality of strip-shaped sealants, and the plurality of strip-shaped sealants are arranged at intervals from each other and staggered with the exhaust holes.

[0010] In an optional technology of the present invention, the support plate and the bottom guard plate are provided with a plurality of corresponding through holes, and the second area includes a plurality of annular sealants arranged around the through holes.

[0011] In an optional technology of the present invention, the bottom guard plate includes a horizontal plane and a vertical plane vertically connected to the edge of the horizontal plane; the sealant layer also includes a third area, and the third area is arranged between the horizontal plane and the bottom wall of the frame.

[0012] In an optional technology of the present invention, the sealant layer further includes a fourth region, and the fourth region is arranged between the outer side wall of the surrounding frame and the vertical surface.

[0013] In the optional technology of the present utility model, it is characterized in that the thickness of the sealant layer is 0.5-1mm.

[0014] In the optional technology of the present invention, it is characterized in that the adhesive force of the sealant layer is not less than 3Mpa.

[0015] In a second aspect, the utility model further provides an electrical device, comprising the above-mentioned battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0017] Figure 1 A schematic diagram of the bottom structure of the battery pack of the present invention;

[0018] Figure 2 This is a schematic diagram of the bottom structure layering of the battery pack of the present utility model;

[0019] Figure 3 It is a schematic structural diagram of the sealing layer of the battery pack of the utility model;

[0020] Figure 4 It is a schematic cross-sectional view of the connection between the bottom frame, the sealing layer and the bottom guard plate of the battery pack of the present invention. DETAILED DESCRIPTION

[0021] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0022] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0023] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "setting", and "connection" 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 direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In order to solve the existing technology, Figure 1-Figure 2 As shown, the utility model provides a battery pack, the bottom assembly of the battery pack includes a bottom frame 1, a sealing layer 2, and a bottom guard plate 3; the bottom frame 1 exhausts air space, the sealing layer 2 is located between the bottom frame 1 and the bottom guard plate 3, the bottom guard plate 3 includes a surrounding frame 11 and a plurality of support plates 12, the plurality of support plates 12 are arranged in a space surrounded by the surrounding frame 11 at intervals along a first direction, and both ends of the support plates in a second direction are connected to the surrounding frame 11;

[0025] The sealant layer 2 is located between the bottom frame 1 and the bottom guard plate 3, wherein the sealant layer 2 between the support plate 12 and the bottom guard plate 3 is discontinuous in the second direction, so that the spaces on both sides of the support plate 12 in the first direction are connected.

[0026] Through the design of the discontinuous sealant layer 2 in the second direction mentioned above, at least a portion between the bottom frame 1 and the bottom guard plate 3 is not provided with sealant, and this portion becomes a gap between the bottom guard plate 3 and the support plate 12, and the ends of the gap are respectively connected to the spaces on both sides of the support plate 12. When thermal runaway occurs in the battery cell in the battery pack, the high-temperature gas generated is not only limited to the space formed between the two support plates 12 supporting the battery cell, but will flow between various spaces along the gap between the bottom guard plate 3 and the bottom frame 1. If the sealant is arranged in a track pattern, the high-temperature gas generated by the thermal runaway can diffuse along a fixed path. The thermal runaway of one battery cell can distribute the gas to the entire battery pack, and the exhaust channels of other parts can be fully utilized to discharge the gas to the outside of the battery pack.

[0027] More importantly, if leakage occurs, the liquid will flow along the front compartment profile into the space between the bottom guard plate 3 and the bottom frame 1. The liquid can flow in any position not covered by the sealant, and finally be distributed throughout the bottom of the battery pack. If the leakage of the liquid increases further, the liquid will eventually enter the profile cavity through the vent holes on the bottom surface of the bottom frame 1, and the volume of the internal cavity of the profile part that constitutes the bottom frame 1 is much larger than the total volume of the liquid in the battery pack. In this case, the leaked liquid is better contained, avoiding the risk of short circuit of the battery cell due to liquid contact with the battery cell.

[0028] As an embodiment, the thickness of the sealant layer 2 is about 0.6 mm. The 0.6 mm sealant layer 2 makes the gap between the bottom guard plate 3 and the bottom frame 1 also close to 0.6 mm. The sealant layer 2 of a certain thickness is formed by coating one of the opposite surfaces of the bottom guard plate 3 and the bottom frame 1 with sealant in a fixed track, and pressing the bottom guard plate 3 and the bottom frame 1 together.

[0029] According to the actual requirements of exhaust and liquid discharge, the thickness of the sealant layer 2 can be selected to be 0.5 mm-2 mm.

[0030] It should be understood that the thickness of the sealant layer 2 is not necessarily a constant value that is the same everywhere. It is also possible to make the thickness of the sealant layer 2 have reasonable differences at different locations based on actual needs and necessary tolerances by utilizing the certain ductility of the bottom guard plate 3.

[0031] According to the above situation, if Figure 2 As shown, the bottom surface of the support plate 12 has a certain number of exhaust holes, which can divide the bottom frame 1 into a connection area 121 and an exhaust area 122, and the exhaust area 122 is provided with exhaust holes; and the corresponding sealant layer 2 includes a first area 21 and a second area 22, the first area 21 is opposite to the connection area 121, and the second area 22 is opposite to the exhaust area 122.

[0032] As an embodiment, the connection area 121 is located at both ends of the profile in the length direction of the bottom frame 1, the exhaust area 122 is located in the middle of the profile, and the exhaust holes are also concentrated in the middle of the profile. The first area 21 plays a major role in the connection strength between the bottom guard plate 3 and the bottom frame 1. The area covered with sealant in the second area 22 is significantly smaller than the entire exhaust area 122 and avoids the exhaust holes.

[0033] In order to provide better connection strength, the area of ​​the first region 21 should be set to be larger than 80% of the connection region 121; optionally, the sealant is a two-component sealant, and the adhesive force of the sealant is not less than 3Mpa.

[0034] As an embodiment, the second region 22 is formed in the form of multiple strips of sealant, which are spaced apart from each other and staggered with the exhaust holes to prevent the sealant from blocking the exhaust holes and affecting exhaust during thermal runaway.

[0035] like Figure 3 As shown, specifically, the strip sealant is formed by coating the sealant in the exhaust area 122 of the support plate 12 of the bottom frame 1 to avoid the exhaust holes in a multi-segment line shape and then curing it; the multi-segment line shape can be designed into a specific strip shape, such as "I", "L", "X" shape, etc., in the gap between the bottom guard plate 3 and the bottom frame 1 formed by the sealant layer 2, the intervals between the multi-segment strip sealants of these shapes form the aforementioned fixed path for the flow of gas and liquid.

[0036] In addition, since multiple mounting points are usually set in the middle of the battery pack, the mounting points connect the battery pack to electrical equipment such as vehicles through connecting bolts; the connecting bolts usually penetrate the entire battery pack in the vertical direction, so that a corresponding number of through holes are formed on the bottom frame 1 and the bottom guard plate 3 at corresponding positions in the exhaust area 122. In order to ensure that the gas in the battery pack does not leak due to the presence of the through holes, a seal must be set around the through holes.

[0037] Therefore, the second area 22 located in the middle of the sealant layer 2 includes a plurality of annular sealants, and each annular sealant is disposed correspondingly around the through hole.

[0038] like Figure 4 As shown, the sealing connection between the bottom guard plate 3 and the surrounding frame 11 of the bottom frame 1 is divided into two parts, horizontal and vertical. The corresponding sealant layer 2 is respectively the third area 23 and the fourth area 24, and the two corresponding positions are provided with grooves for accommodating the sealant; the bottom guard plate 3 correspondingly includes two parts, a horizontal surface and a vertical surface vertically connected to the edge of the horizontal surface. Among them, the vertical surface can be a vertical edge perpendicular to the horizontal surface formed by folding the outer peripheral part of the originally straight metal plate through a machining process such as stamping and bending.

[0039] Among them, the bottom surface of the enclosure 11 is provided with a first groove. When the sealant is applied, an excess amount of sealant is filled in the first groove. When the bottom guard plate 3 and the bottom frame 1 are pressed together to form a sealant layer 2, the sealant that exceeds the capacity of the first groove is squeezed to form a sealant layer 2 of a certain thickness. The portion of the sealant layer 2 located between the bottom surface of the enclosure 11 and the horizontal plane of the bottom guard plate 3 is the third area 23. The third area 23 contains the sealant located in the groove, which is called the boss sealant. In addition to the primary sealing of the portion between the bottom surface of the enclosure 11 and the horizontal plane of the bottom guard plate 3, the boss sealant has a secondary sealing effect on the sealing of the horizontal plane of the bottom guard plate 3 and the corresponding portion of the enclosure 11, which can further prevent the gas inside the battery pack from escaping to the outside of the battery pack during thermal runaway. Of course, the upper boss sealant can also be used directly with a sealing strip. In this way, after the sealing strip is set in the first groove, the shape of the sealing strip matches the first groove, and then the sealant is applied and a seal is formed when the bottom guard plate 3 and the bottom frame 1 are pressed together.

[0040] The sealant disposed between the vertical surface of the bottom guard plate 3 and the outer side wall of the surrounding frame 11 of the bottom frame 1 is called the fourth area 24. The sealant fourth area 24 located in the second groove has a triple sealing effect on the sealing air passage between the horizontal surface of the bottom guard plate 3 and the surrounding frame 11.

[0041] Furthermore, the part where the vertical surface of the bottom guard plate 3 is connected to the bottom surface of the bottom guard plate 3 forms a second groove extending along the outer wall of the surrounding frame 11, and the fourth area 24 of the sealant layer 2 is arranged in the second groove. The second groove can be formed by stamping the part when processing the vertical surface.

[0042] So far, the technical solution of the utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings, but it is easy for those skilled in the art to understand that the protection scope of the utility model is obviously not limited to these specific embodiments. Without departing from the principle of the utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the utility model.

Claims

1. A battery pack, characterized in that: The battery pack comprises a bottom frame (1), a sealing rubber layer (2), and a bottom protective plate (3); The bottom frame (1) comprises a surrounding frame (11) and a plurality of support plates (12); the plurality of support plates (12) are arranged at intervals in a space surrounded by the surrounding frame (11) along a first direction, and both ends of the support plates (12) in a second direction are connected to the surrounding frame (11); The sealant layer (2) is located between the bottom frame (1) and the bottom guard plate (3), wherein the sealant layer (2) between the support plate (12) and the bottom guard plate (3) is discontinuous in the second direction, so that the spaces on both sides of the support plate (12) in the first direction are connected.

2. The battery pack according to claim 1, characterized in that: The support plate (12) comprises: a connection area (121) and an exhaust area (122), wherein the exhaust area (122) is provided with exhaust holes; The sealant layer (2) comprises a first region (21) and a second region (22); the first region (21) is arranged opposite to the connection region (121), and the second region (22) is arranged opposite to the exhaust region (122).

3. The battery pack according to claim 2, characterized in that: The area of ​​the first region (21) is larger than 80% of the connecting region (121).

4. The battery pack according to claim 2, characterized in that: The second area (22) comprises a plurality of strip-shaped sealants, wherein the plurality of strip-shaped sealants are arranged at intervals and staggered with the exhaust holes.

5. The battery pack according to claim 2, characterized in that: The support plate (12) and the bottom guard plate (3) are provided with a plurality of corresponding through holes, and the second area (22) includes a plurality of annular sealants arranged around the through holes.

6. The battery pack according to claim 1, characterized in that: The bottom guard plate (3) comprises a horizontal surface and a vertical surface vertically connected to the edge of the horizontal surface; The sealant layer (2) further comprises a third region (23), and the third region (23) is arranged between the horizontal plane and the bottom wall of the surrounding frame (11).

7. The battery pack according to claim 6, characterized in that: The sealant layer (2) further comprises a fourth region (24), wherein the fourth region (24) is arranged between the outer side wall of the surrounding frame (11) and the vertical surface.

8. The battery pack according to any one of claims 1 to 7, characterized in that: The thickness of the sealant layer (2) is 0.5 mm-1 mm.

9. The battery pack according to any one of claims 1 to 7, characterized in that: The adhesive force of the sealant layer is not less than 3Mpa.

10. An electrical device, characterized in that: The electrical device comprises a battery pack according to any one of claims 1-9.

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