Battery pack and electric equipment

Abstract

The present invention relates to the technical field of new energy batteries, and discloses a battery pack and electric equipment, the battery pack comprises: a box body, the box body comprises a frame beam, and the box body has a first direction, a second direction and a third direction; the side plates extend in the first direction, the multiple side plates are arranged in the second direction at intervals, an assembly space is formed between every two adjacent side plates, and clearance gaps are formed between the side plates and the frame beams in the first direction; the battery cells are assembled in the assembling space, and the battery cells are arranged in the first direction; the avoiding gap is filled with the polystyrene foam layer, and the polystyrene foam layer is connected with the side plates and the frame beams. The large area of the battery cell faces the frame beam, the battery cell provides certain strength for the battery pack in the second direction, the clearance guarantees that the polystyrene foam layers on the two sides of the side plate are evenly filled into a whole, the side plate can serve as a force transmission structure, the polystyrene foam layers play a role in buffering and damping while transmitting force, the mechanical strength of the battery pack is guaranteed, and the service life of the battery pack is prolonged. And meanwhile, a reinforcing rib is omitted, so that the energy density of the battery pack is improved.

Description

Technical Field

[0001] This invention relates to the field of new energy battery technology, and in particular to a battery pack and electrical equipment. Background Technology

[0002] Existing battery packs typically have cells arranged in a direction perpendicular to the driving direction, with the cells spaced a certain distance from the side beams to buffer against side collisions. At the same time, the battery pack needs to have crossbeams and longitudinal beams to strengthen its mechanical strength. However, the distance between the cells and the side beams, as well as the arrangement of the crossbeams and longitudinal beams, all reduce the energy density of the battery pack.

[0003] The existing battery pack includes a housing and a liquid cooling plate. The housing includes a frame and a bottom guard plate. The bottom guard plate is arranged at the bottom of the frame. The liquid cooling plate is arranged in the accommodating space enclosed by the frame and the bottom guard plate. Multiple reinforcing ribs are arranged at intervals on the frame. The reinforcing ribs are located above the liquid cooling plate. The two ends of the reinforcing ribs are welded and fixed to the frame. The reinforcing ribs extend perpendicular to the driving direction of the vehicle. Battery modules are assembled between two adjacent reinforcing ribs. The battery modules are arranged perpendicular to the driving direction.

[0004] The aforementioned battery pack has reinforcing ribs on its frame to enhance its mechanical strength. However, these ribs occupy space within the battery pack used for assembling battery modules, which reduces the energy density of the battery pack. Summary of the Invention

[0005] The purpose of this invention is to provide a battery pack that solves the problem that the use of reinforcing ribs to strengthen the mechanical strength of existing battery packs reduces the energy density of the battery pack; this invention also provides an electrical device using this battery pack.

[0006] To achieve the above objectives, the present invention provides a battery pack comprising:

[0007] The box body includes a side frame beam, and the box body has a first direction, a second direction and a third direction that intersect each other in pairs;

[0008] Side panels, the side panels extending along the first direction, the side panels being spaced apart along the second direction, an assembly space being formed between two adjacent side panels, and a clearance gap being formed between the side panels and the frame beam along the first direction;

[0009] A battery cell, wherein the battery cell is assembled in the assembly space and the battery cells are arranged along the first direction;

[0010] A foam layer that fills the clearance gap and connects the side panel to the frame beam.

[0011] Preferably, the frame beam includes a platform section and a vertical plate section, the platform section extending relative to the vertical plate section into the assembly space; the side plate has a concave surface and an end face connected to the concave surface along the third direction, the concave surface is supported by the platform section, and the clearance space is provided between the end face and the vertical plate section.

[0012] Preferably, there is a smooth transition curve between the platform segment and the upright segment, and the concave surface is adapted to the curve segment.

[0013] Preferably, it further includes an end plate, which is arranged at the end of the assembly space along the first direction, between the battery cell and the foam layer, and the end plate is attached to the foam layer.

[0014] Preferably, the end plate is a polycarbonate component or a foam component.

[0015] Preferably, it further includes a structural adhesive layer, which is bonded between the side plate and the battery cell.

[0016] Preferably, the device further includes adhesive limiting strips, which are arranged at both ends of the side plate along the third direction. The adhesive limiting strips are arranged on both sides of the side plate along the second direction. The adhesive limiting strips are in contact with the battery cell. The structural adhesive layer is arranged within the space enclosed by the adhesive limiting strips, the side plate, and the battery cell.

[0017] Preferably, the battery cell has a windowed area, and the structural adhesive layer is disposed opposite to the windowed area.

[0018] Preferably, it further includes a liquid cooling plate, with a gap between the side plate and the liquid cooling plate along the third direction, the battery cell being arranged on the liquid cooling plate, and the side plate, the battery cell and the liquid cooling plate forming an overflow space for accommodating structural adhesive.

[0019] The present invention also provides an electrical device comprising the battery pack described in any of the above technical solutions.

[0020] Compared with the prior art, the battery pack and electrical equipment of this invention have the following advantages: the battery cells of the battery pack are arranged along a first direction, with the large area of ​​the battery cells facing the frame beam. The battery cells themselves provide a certain strength to the battery pack in a second direction. There is a clearance gap between the side plates and the frame beam between the battery cells. The foam layer fills the clearance gap and connects the side plates and the frame beam. The clearance gap ensures that the foam layer on both sides of the side plate is filled evenly as a whole. The side plate can act as a force transmission structure, transmitting the impact force from the frame beam at one end to the frame beam at the other end through the foam layer. The foam layer plays a buffering and shock absorption role while transmitting force, ensuring the mechanical strength of the battery pack. At the same time, the configuration of reinforcing ribs is omitted, the gap between the battery cells and the frame beam is reduced, and the energy density of the battery pack is improved. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the battery pack of the present invention;

[0022] Figure 2 yes Figure 1 A top view of the battery pack;

[0023] Figure 3 yes Figure 1 An enlarged structural diagram of point A of the battery pack;

[0024] Figure 4 yes Figure 1 A cross-sectional view of the assembly of the side panel, battery cells, and liquid cooling plate of the battery pack;

[0025] Figure 5 yes Figure 1 A three-dimensional structural diagram omitting the battery cell, foam layer, and end plate;

[0026] Figure 6 yes Figure 5 An enlarged schematic diagram of the structure at point B;

[0027] Figure 7 yes Figure 5 Enlarged structural diagram of the side panel and frame beam of the battery pack.

[0028] In the diagram, 1. Box body, 11. Frame beam, 111. Platform stage, 112. Vertical plate section, 2. Side plate, 21. Assembly space, 22. Concave surface, 23. End face, 3. Clearance gap, 4. Battery cell, 41. Window area, 5. Foam layer, 6. End plate, 7. Glue limiting strip, 8. Structural glue layer, 9. Glue overflow space, 10. Liquid cooling plate, X. First direction, Y. Second direction, Z. Third direction. Detailed Implementation

[0029] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0030] A preferred embodiment of the battery pack of the present invention, such as... Figures 1 to 7 As shown, the battery pack includes a housing 1, a side panel 2, battery cells 4, and a foam layer 5. The housing 1 is the supporting structure of the battery pack, and the side panel 2, battery cells 4, and foam layer 5 are all arranged inside the housing 1.

[0031] The housing 1 has a first direction X, a second direction Y, and a third direction Z that intersect each other. In this embodiment, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. The first direction X is the width direction of the vehicle when it is traveling, the second direction Y is the length direction of the vehicle when it is traveling, and the third direction Z is the height direction of the vehicle. The housing 1 includes a side beam 11, which extends along the second direction Y. There are two sets of side beams 11, which are located at both ends of the housing 1 in the second direction Y. The side beams 11 are the main stress-bearing structure of the housing 1 during a collision and are used to protect the battery cells 4 inside the housing 1.

[0032] Side plates 2 extend along a first direction X, and multiple side plates 2 are spaced apart along a second direction Y, forming an assembly space 21 between adjacent side plates 2. Battery cells 4 are assembled within the assembly space 21, arranged along the first direction X. The distance between adjacent side plates 2 is adapted to the width of the battery cell 4, ensuring that only one set of battery cells 4 is arranged between adjacent side plates along the first direction X. After the battery cells 4 are arranged along the first direction X, a large area of ​​the battery cell 4 faces the frame beam 11, and the battery cell 4 itself provides a certain strength to the battery pack in the second direction Y.

[0033] A clearance 3 is provided between the side plate 2 and the frame beam 11 along the first direction X. The foam layer 5 fills the clearance 3 and connects the side plate 2 and the frame beam 11. When the frame beam 11 of the battery pack is impacted, the clearance 3 provides deformation space for the frame beam 11 and absorbs the impact force. At the same time, the clearance 3 connects the two sides of the side plate 2 in the second direction Y. When the foam is filled into the battery pack, the foam can flow from the clearance 3 to the two sides of the side plate 2, which facilitates the uniformity of the foam filling.

[0034] After the foam layer 5 connects the side panel 2 and the frame beam 11, the side panel 2 and the frame beam 11 are connected as a whole. The side panel 2 can serve as a force transmission structure, transmitting the impact force from the frame beam 11 at one end to the frame beam 11 at the other end. In addition, the foam layer 5 can absorb the impact force through its own elasticity when transmitting the impact force, and has the function of buffering and shock absorption.

[0035] The battery cells 4 of the battery pack are arranged along the first direction X, with the large area of ​​the battery cells 4 facing the frame beam 11. The battery cells 4 themselves provide a certain strength to the battery pack in the second direction Y. There is a clearance gap 3 between the side plates 2 and the frame beam 11 between the battery cells 4. The foam layer 5 fills the clearance gap 3 and connects the side plates 2 and the frame beam 11. The clearance gap 3 ensures that the foam layer 5 on both sides of the side plates 2 is filled evenly as a whole. The side plates 2 can act as a force transmission structure, transmitting the impact force from the frame beam 11 at one end to the frame beam 11 at the other end through the foam layer 5. The foam layer 5 plays a role in buffering and shock absorption while transmitting force, ensuring the mechanical strength of the battery pack. At the same time, the configuration of reinforcing ribs is omitted, the gap between the battery cells 4 and the frame beam 11 is reduced, and the energy density of the battery pack is improved.

[0036] Preferably, the frame beam 11 includes a platform stage 111 and a vertical plate section 112, with the platform stage 111 extending toward the assembly space 21 relative to the vertical plate section 112; the side plate 2 has a concave surface 22 and an end face 23 connected to the concave surface 22 along a third direction Z, the concave surface 22 is supported on the platform stage 111, and the clearance space 3 is provided between the end face 23 and the vertical plate section 112.

[0037] The platform stage 111 of the frame beam 11 extends towards the assembly space 21 relative to the upright plate section 112. The platform stage 111 can overlap with the liquid cooling plate 10 at the bottom of the battery pack and be fixed by structural adhesive, so that the frame beam 11 and the liquid cooling plate 10 are bonded as a whole. The concave surface 22 of the side plate 2 is supported on the platform stage 111. The side plate 2 can be supported on the platform stage 111 through the concave surface 22. The platform stage 111 supports and limits the side plate 2 through the concave surface 22, and also increases the contact area between the side plate 2 and the frame beam 11, so as to better transmit the impact force.

[0038] An clearance gap 3 is formed between the vertical plate section 112 of the frame beam 11 and the end face 23 of the side plate 2. After the foam layer 5 fills the clearance gap 3, it falls on the platform stage 111, increasing the contact area between the foam layer 5 and the frame beam 11. The foam layer 5 can better transmit the impact force between the side plate 2 and the frame beam 11.

[0039] Preferably, there is a smooth transition curve between the platform section 111 and the vertical plate section 112, and the concave surface 22 is adapted to the curve section.

[0040] The transition between the platform stage 111 and the vertical plate stage 112 is smoothed by a curved segment, reducing abrupt changes in the frame beam 11, minimizing stress concentration areas, increasing the contact area between the platform stage 111 and the side plate 2, and improving force transmission. In this embodiment, the curved segment is an arc segment.

[0041] Preferably, it also includes an end plate 6, which is arranged at the end of the assembly space 21 along the first direction X. The end plate 6 is arranged between the battery cell 4 and the foam layer 5, and the end plate 6 and the foam layer 5 are attached together.

[0042] End plate 6 is positioned between battery cell 4 and foam layer 5. In this embodiment, end plate 6 is bonded to the side of battery cell 4 and then assembled inside housing 1. Housing 1 is filled with foam, and end plate 6 is bonded to foam layer 5. Battery cell 4, end plate 6, and foam are connected as a whole. End plate 6, positioned between foam layer 5 and battery cell 4, can deform to absorb impact force, thus providing a cushioning effect. Additionally, end plate 6 also has a certain heat insulation effect, preventing excessively rapid temperature changes within the battery pack.

[0043] Preferably, the end plate 6 is a polycarbonate part or a foam part.

[0044] Both polycarbonate and foam components are porous, deformable, and compressible materials. Upon impact, they can cushion the impact through deformation, while their porous structure provides insulation. Polycarbonate components offer better insulation than foam components, while foam components provide better cushioning. In this embodiment, the polycarbonate and foam components are adhered to the battery cell 4 using adhesive backing.

[0045] Preferably, it also includes a structural adhesive layer 8, which is bonded between the side plate 2 and the battery cell 4.

[0046] The structural adhesive layer 8 is bonded between the side plate 2 and the battery cell 4, connecting the side plate 2 and the battery cell 4 into a whole, which can improve the overall strength of the battery pack.

[0047] Preferably, it also includes a limiting strip 7, which is arranged at both ends of the side plate 2 along the third direction Z, and the side plate 2 is arranged on both sides along the second direction Y. The limiting strip 7 is in contact with the battery cell 4, and the structural adhesive layer 8 is arranged in the space enclosed by the limiting strip 7, the side plate 2 and the battery cell 4.

[0048] The adhesive limiting strip 7 is elastic and has a certain thickness. The adhesive limiting strip 7 is arranged at both ends of the third direction Z of the side plate 2. After the adhesive limiting strip 7 comes into contact with the battery cell 4, the distance between the battery cell 4 and the side plate 2 can be limited by the adhesive limiting strip 7, thereby controlling the thickness of the structural adhesive layer 8, ensuring the uniformity of the bonding between the structural adhesive layer 8 and the battery cell 4, and improving the bonding effect. At the same time, the adhesive limiting strip 4 can also prevent the structural adhesive from overflowing into the space between the side plate 2 and the battery cell 4.

[0049] Preferably, the battery cell 4 has a window area 41, and the structural adhesive layer 8 is disposed opposite to the window area 41.

[0050] The windowed area 41 refers to the area of ​​the battery cell 4 that is not covered by the insulation layer. The battery cell 4 will expose its own metal shell at the windowed area 41. The structural adhesive layer 8 is in direct contact with the metal shell at the windowed area 41. The metal shell has a higher coefficient of friction, and the connection between the structural adhesive layer 8 and the metal shell is more stable after they come into contact.

[0051] Preferably, it also includes a liquid cooling plate 10, with a gap between the side plate 2 and the liquid cooling plate 10 along the third direction Z, and the battery cell 4 is arranged on the liquid cooling plate 10. The side plate 2, the battery cell 4 and the liquid cooling plate 10 form an overflow space 9 for accommodating structural adhesive.

[0052] There is a gap between the side plate 2 and the liquid cooling plate 10 in the third direction Z to form an overflow space 9. The overflow space 9 can ensure the thickness of the adhesive layer on the liquid cooling plate 10. In addition, if too much adhesive is applied during potting, the overflow space 9 can allow the excess structural adhesive to overflow into the gap between the cell 4 and the side plate 2. At the same time, the adhesive limiting strip 7 seals the gap between the side plate 2 and the cell 4 to prevent the structural adhesive from continuing to overflow upward.

[0053] The present invention also provides a preferred embodiment of an electrical device, including a battery pack, the specific structure of which is the same as that of the battery pack described in any of the above embodiments, and will not be repeated here.

[0054] In summary, the embodiments of the present invention provide a battery pack and an electrical device. The battery cells of the battery pack are arranged along a first direction, with the large area of ​​the battery cells facing the frame beam. The battery cells themselves provide a certain strength to the battery pack in a second direction. There is a clearance gap between the side plates between the battery cells and the frame beam. The foam layer fills the clearance gap and connects the side plates and the frame beam. The clearance gap ensures that the foam layer on both sides of the side plate is filled evenly as a whole. The side plate can act as a force transmission structure, transmitting the impact force from the frame beam at one end to the frame beam at the other end through the foam layer. The foam layer plays a buffering and shock absorption role while transmitting force, ensuring the mechanical strength of the battery pack. At the same time, the configuration of reinforcing ribs is omitted, the gap between the battery cells and the frame beam is reduced, and the energy density of the battery pack is improved.

[0055] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A battery pack, characterized in that, include: The box body includes a side frame beam, and the box body has a first direction, a second direction and a third direction that intersect each other in pairs; Side panels, the side panels extending along the first direction, the side panels being spaced apart along the second direction, an assembly space being formed between two adjacent side panels, and a clearance gap being formed between the side panels and the frame beam along the first direction; A battery cell, wherein the battery cell is assembled in the assembly space and the battery cells are arranged along the first direction; A foam layer that fills the clearance gap and connects the side panel to the frame beam.

2. The battery pack according to claim 1, characterized in that, The frame beam includes a platform section and a vertical plate section, the platform section extending relative to the vertical plate section into the assembly space; the side plate has a concave surface and an end face connected to the concave surface along the third direction, the concave surface is supported by the platform section, and the clearance space is provided between the end face and the vertical plate section.

3. The battery pack according to claim 2, characterized in that, The platform segment and the upright segment have a smooth transition curve segment, and the concave surface is adapted to the curve segment.

4. The battery pack according to claim 1 or 2, characterized in that, It also includes an end plate, which is arranged at the end of the assembly space along the first direction, between the battery cell and the foam layer, and the end plate is attached to the foam layer.

5. The battery pack according to claim 4, characterized in that, The end plate is a polycarbonate component or a foam component.

6. The battery pack according to claim 1 or 2, characterized in that, It also includes a structural adhesive layer, which is bonded between the side plate and the battery cell.

7. The battery pack according to claim 6, characterized in that, It also includes adhesive limiting strips, which are arranged at both ends of the side plate along the third direction. The adhesive limiting strips are arranged on both sides of the side plate along the second direction. The adhesive limiting strips are in contact with the battery cell. The structural adhesive layer is arranged in the space enclosed by the adhesive limiting strips, the side plate and the battery cell.

8. The battery pack according to claim 7, characterized in that, The battery cell has a windowed area, and the structural adhesive layer is disposed opposite to the windowed area.

9. The battery pack according to claim 1 or 2, characterized in that, It also includes a liquid cooling plate, with a gap between the side plate and the liquid cooling plate along the third direction, the battery cell being arranged on the liquid cooling plate, and the side plate, the battery cell and the liquid cooling plate forming an overflow space for accommodating structural adhesive.

10. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1-9.

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