Battery pack

Abstract

The utility model provides a battery pack and relates to the field of battery packs. The battery pack comprises a box body, the box body has a first direction and a second direction which are intersected, and the box body comprises a bottom plate and first side plates connected to the two ends of the bottom plate in the first direction; the battery pack is arranged in the containing cavity of the box body, the battery pack comprises a plurality of battery cells arranged in the first direction, the battery cells are provided with side faces corresponding to the first direction, and primer is arranged between the battery pack and the bottom plate; the isolation foam is mounted between the side surface of the battery cell at the end part of the first direction of the battery pack and the first side plate, and the isolation foam comprises a bottom edge and two side edges which are arranged in a U shape; the isolation foam is provided with an opening opposite to the bottom plate, the side face of the battery cell at the end of the first direction, the first side plate and the two side edges of the battery pack define a glue pouring area, and the bottom edge and the bottom plate are arranged in a spaced mode. Equivalently, isolation protection is formed on the corresponding bottom edge and two side edges of the side surface of the battery cell, so that the aim of isolating glue with different functions is fulfilled.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, in particular to a battery pack. Background Art

[0002] During the production process of the battery pack, multiple battery cells are usually combined to form a battery module, and then the battery module is assembled in a box to form a battery pack.

[0003] Generally, the battery module should be easy to assemble in the box and have good preload force on the battery module. In order to ensure that the battery module is subjected to continuous preload force in the box, fillers are set in the gap between the box and the battery module, and glue is required to bond the battery module to the box. However, the glue functions at different bonding positions are also different, and existing fillers are difficult to meet the requirements of isolating glues with different functions. Utility Model Content

[0004] In order to solve the above problems, the purpose of the utility model is to provide a battery pack to solve the problem that it is difficult to ensure that the battery pack is subjected to good pre-tightening force, and at the same time the filler can effectively isolate glues with different functions.

[0005] The technical solution of the battery pack of the utility model is:

[0006] Battery pack, including:

[0007] A box body, the box body has a first direction and a second direction intersecting each other, the box body has a containing cavity, and the box body includes a bottom plate and first side plates connected to two ends of the bottom plate in the first direction;

[0008] A battery pack, the battery pack is arranged in the accommodating cavity, and a bottom glue is arranged between the battery pack and the bottom plate; the battery pack comprises a plurality of battery cells arranged along the first direction, and the battery cells have side surfaces arranged opposite to each other along the first direction;

[0009] An isolation foam, the isolation foam is installed between the side surface of the battery cell at the end of the battery pack in the first direction and the first side plate, the isolation foam comprises a bottom edge and two side edges arranged in a U shape;

[0010] The isolation foam is provided with an opening facing away from the bottom plate, the side surface of the battery cell, the first side plate and the two side edges form a glue filling area, and the bottom edge is spaced apart from the bottom plate to prevent the bottom glue from overflowing to the side surface.

[0011] Furthermore, the isolation foam includes a foam body and a plastic bag, the foam body is compressed and arranged in the plastic bag, and the plastic bag is also provided with a tearing hole, so that when the tearing hole is opened, air can enter to make the foam body rebound in a first direction.

[0012] Furthermore, the battery cell is a square battery cell, the box body has a third direction, the first direction, the second direction and the third direction intersect each other; the bottom edge is set flush with the edge of the side length along the second direction, and the two side edges are respectively set flush with the edges of the side length along the third direction.

[0013] Furthermore, the battery pack is arranged with at least two rows of the battery cells along the second direction, and the isolation foam is provided on the side surfaces of the battery cells at the end of each row along the first direction.

[0014] Furthermore, the box body also includes a second side panel relatively arranged along the second direction, the battery cell has end faces relatively arranged along the second direction, and an end face isolation foam is provided between the end face of the battery cell and the second side panel, the middle part of the end face isolation foam has a glue receiving area, and the end face isolation foam is provided with an opening on the side facing away from the bottom plate.

[0015] Furthermore, the end surface isolation foam is further provided with two overflow glue buffer areas, and the two overflow glue buffer areas are respectively arranged on both sides of the glue containing area in the first direction.

[0016] Furthermore, the end face isolation foam includes a bottom section and four side sections, wherein two of the side sections are respectively vertically connected to one end of the bottom section in the first direction, and the other two side sections are respectively vertically connected to the other end of the bottom section in the first direction, and the two side sections located in the middle of the first direction form the glue containing area, and the two side sections located at the same end are spaced apart to form the glue overflow buffer area.

[0017] Furthermore, the box body has a third direction, and the first direction, the second direction and the third direction intersect each other; the end surface isolation foam is arranged in the middle position of the battery cell along the third direction, and the two overflow buffer zones are symmetrically distributed with the third direction as the axis.

[0018] Furthermore, the glue pouring area is filled with a potting glue, and the hardness of the potting glue is less than the hardness of the base glue.

[0019] Furthermore, a partition is provided on the side of the battery cell at the end in the first direction close to the first side plate, and the isolation foam is adhered to the side of the partition close to the first side plate.

[0020] Beneficial effects: The battery pack adopts a structural design of a box, a battery pack and an isolation foam. The battery pack is arranged in the box, and a primer is arranged between the bottom surface of the battery pack and the bottom plate surface of the box. The primer is first applied to the bottom plate of the box, and then the battery pack is placed and a pressure device is used to generate a pressing force, so that the primer is evenly spread, thereby playing a full bonding role between the battery pack and the bottom plate of the box. The primer has good thermal conductivity and can quickly conduct the heat generated by the battery pack to the bottom plate to achieve the purpose of efficient heat conduction.

[0021] Moreover, the isolation foam is installed between the side of the battery cell at the end of the battery pack in the first direction and the first side plate, and the isolation foam includes a bottom edge and two side edges arranged in a U shape. The isolation foam is easy to compress and has good resilience, which can meet the requirements of rapid installation of the battery pack. The opening of the isolation foam is arranged with its back to the bottom plate, and the bottom edge of the isolation foam contacts the bottom glue, which can prevent the bottom glue from overflowing to the side position of the battery cell of the battery pack during the glue pressing process, ensuring that the bottom glue is only retained at the bottom of the battery pack as much as possible.

[0022] In addition, the glue-filling area formed by the structure of the isolation foam itself is filled with potting glue through the U-shaped opening after the glue pressing is completed. The potting glue is bonded between the side of the battery cell and the first side plate. The bonding force of the potting glue is combined to make up for the problem of insufficient pre-tightening force of the foam, thereby improving the stability and reliability of the battery pack after assembly; and the potting glue can still be elastically deformed after curing, and can absorb the thermal expansion deformation of the battery pack in the first direction. The isolation foam is equivalent to forming an isolation protection on the side of the battery cell corresponding to the bottom edge and the two side edges, achieving the purpose of isolating glues with different functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the interior of a battery pack in a specific embodiment of the battery pack of the utility model;

[0024] Figure 2 It is a three-dimensional schematic diagram of a battery pack and an isolation foam in a specific embodiment of the battery pack of the utility model;

[0025] Figure 3 for Figure 2 A top view of the battery pack and isolation foam;

[0026] Figure 4 for Figure 2 A schematic diagram of the main view of the battery pack and the isolation foam;

[0027] Figure 5 for Figure 2 A schematic diagram of the right side of the battery pack and the isolation foam;

[0028] Figure 6 It is a three-dimensional schematic diagram of the isolation foam (when filled with potting glue) in a specific embodiment of the battery pack of the utility model;

[0029] Figure 7 It is a three-dimensional schematic diagram of the isolation foam in a compressed state in a specific embodiment of the battery pack of the utility model;

[0030] In the figure: 1-battery pack, 10-battery cell, 11-side, 12-end face, 13-partition, 14-bottom glue, 2-isolation foam, 20-bottom edge, 21-side, 22-glue filling area, 23-foam body, 24-plastic bag, 25-tear hole, 26-filling glue, 3-end face isolation foam, 30-glue holding area, 31-glue overflow buffer zone, 32-bottom section, 33-side section, 4-box, 40-holding cavity, 41-bottom plate, 42-first side plate, 43-second side plate, X-first direction, Y-second direction, Z-third direction. DETAILED DESCRIPTION

[0031] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0032] A specific embodiment 1 of the battery pack of the utility model is as follows: Figures 1 to 7 As shown, the battery pack includes: a box body 4, the box body 4 has a first direction X and a second direction Y intersecting each other. It should be noted that the first direction may be the length direction of the box body 4, the second direction may be the width direction of the box body 4, the first direction X and the second direction Y may be perpendicular, the box body 4 has a accommodating cavity 40, the box body 4 includes a bottom plate 41, and a first side plate 42 connected to the bottom plate 41 at both ends of the first direction X; a battery pack 1, the battery pack 1 is arranged in the accommodating cavity 40, and a bottom glue 14 is provided between the battery pack 1 and the bottom plate 41; the battery pack 1 includes a plurality of battery cells 10 arranged along the first direction X, and the battery cells 10 have side surfaces 11 arranged opposite to each other along the first direction X.

[0033] The isolation foam 2 is installed between the side 11 of the battery cell 10 at the end of the battery pack 1 in the first direction X and the first side plate 42. The isolation foam 2 includes a bottom edge 20 and two side edges 21 arranged in a U shape. The isolation foam 2 is provided with an opening facing away from the bottom plate 41. The side 11 of the battery cell 10, the first side plate 42 and the two side edges 21 form a glue filling area 22. The bottom edge 20 is spaced apart from the bottom plate 41 to prevent the bottom glue 14 from overflowing to the side 11.

[0034] The battery pack adopts a structural design of a box body 4, a battery pack 1 and an isolation foam 2. The battery pack 1 is arranged in the box body 4, and a base glue 14 is arranged between the bottom surface of the battery pack 1 and the surface of the bottom plate 41 of the box body 4. The base glue 14 is first applied on the bottom plate 41 of the box body 4, and then the battery pack 1 is placed and a pressure device is used to generate a pressing force, so that the base glue 14 is evenly spread, thereby playing a full bonding role between the battery pack 1 and the bottom plate 41 of the box body 4. The base glue 14 has good thermal conductivity and can quickly conduct the heat generated by the battery pack 1 to the bottom plate 41 to achieve the purpose of efficient heat conduction.

[0035] Moreover, the isolation foam 2 is installed between the side 11 of the battery cell 10 at the end of the battery pack 1 in the first direction X and the first side plate 42, and the isolation foam 2 includes a bottom edge 20 and two side edges 21 arranged in a U shape. The isolation foam 2 is easy to compress and has good resilience, which can meet the requirements of rapid installation of the battery pack 1. The opening of the isolation foam 2 is arranged away from the bottom plate 41, and the isolation foam 2 is in contact with the bottom glue 14 through the bottom edge 20 of the isolation foam 2, which can prevent the bottom glue 14 from overflowing to the side 11 of the battery cell 10 of the battery pack 1 during the glue pressing process, ensuring that the bottom glue 14 is only retained at the bottom of the battery pack 1 as much as possible.

[0036] In addition, the glue-filling area 22 formed by the structure of the isolation foam 2 is filled with the potting glue 26 through the U-shaped opening after the glue pressing is completed. The potting glue 26 is bonded between the side 11 of the battery cell 10 and the first side plate 42. The bonding force of the potting glue 26 is combined to make up for the problem of insufficient foam pre-tightening force, thereby improving the stability and reliability of the battery pack 1 after assembly; and the potting glue 26 can still be elastically deformed after curing, and can absorb the thermal expansion deformation of the battery pack 1 in the first direction X. The isolation foam 2 is equivalent to forming an isolation protection on the side 11 of the battery cell 10 corresponding to the bottom edge 20 and the two side edges 21, achieving the purpose of isolating glues with different functions.

[0037] In this embodiment, the isolation foam 2 includes a foam body 23 and a plastic bag 24. Figure 7 As shown, the foam body 23 is compressed and arranged in the plastic bag 24, and the plastic bag 24 is also provided with a tearing hole 25, so that when the tearing hole 25 is opened, air can enter to make the foam body 23 rebound in the first direction X. Before use, the plastic bag 24 is first evacuated, and the foam body 23 is compressed in the first direction X under the action of external air pressure, that is, the thickness of the isolation foam 2 is compressed; the compressed isolation foam 2 is pasted on the side 11 of the battery cell of the battery pack 1, and then the battery pack 1 is put into the box, and then the tearing hole 25 of the plastic bag 24 is opened, and air enters to make the foam body rebound in the first direction X, that is, the thickness of the isolation foam 2 rebounds to eliminate the gap between the side 11 of the battery cell of the battery pack 1 and the first side plate 42, which plays a role in facilitating the installation of the battery pack 1 into the box.

[0038] In some embodiments, the battery cell 10 is a square battery cell 10, and the box body 4 has a third direction Z. It should be noted that the third direction may be the height direction of the box body 4, and the first direction X, the second direction Y and the third direction Z intersect each other; the bottom edge 20 is flush with the edge of the side length of the side 11 along the second direction Y, and the two side edges 21 are respectively flush with the edge of the side length of the side 11 along the third direction Z, which can better isolate the bottom glue from overflowing to the side 11. It should be noted that the first direction X and the second direction Y intersect vertically in the plane of the bottom plate 41, and the third direction Z is set perpendicular to the plane direction of the bottom plate 41. In addition, the angle between the first direction X and the second direction Y in the range of 80° to 90° falls within the protection range defined by "vertical" in this embodiment.

[0039] The battery pack 1 is arranged with at least two rows of battery cells 10 along the second direction Y, and the side surfaces 11 of the battery cells 10 at the end of each row along the first direction X are provided with isolation foam 2. It can be ensured that the battery cells 10 at the end of each row in the first direction X have corresponding isolation foam 2, which can reliably fill the gap between the battery pack 1 and the first side plate 42, and effectively absorb the thermal expansion deformation of the battery pack 1 in the first direction X.

[0040] In this embodiment, the box body 4 further includes a second side plate 43 arranged oppositely along the second direction Y, the battery cell 10 has an end face 12 arranged oppositely along the second direction Y, and an end face isolation foam 3 is further provided between the end face 12 of the battery cell 10 and the second side plate 43, and a glue receiving area 30 is provided in the middle of the end face isolation foam 3, and an opening is provided on the side of the end face isolation foam 3 facing away from the bottom plate 41. The end face isolation foam 3 is further provided with two overflowing glue buffer areas 31, and the two overflowing glue buffer areas 31 are respectively arranged on both sides of the glue receiving area 30 in the first direction X. The glue receiving area 30 of the end face isolation foam 3 can be filled with glue, and the end face 12 of the battery cell of the battery pack 1 can be reliably bonded to the second side plate 43 by glue. Moreover, in order to ensure that the amount of glue filled can reach more than 95% of the capacity of the glue receiving area 30, two overflowing glue buffer areas 31 are specially used to store excess glue.

[0041] Among them, the end face isolation foam 3 includes a bottom section 32 and four side sections 33, wherein two side sections 33 are respectively vertically connected to one end of the bottom section 32 in the first direction X, and the other two side sections 33 are respectively vertically connected to the other end of the bottom section 32 in the first direction X, and the two side sections 33 located in the middle of the first direction X form a glue containing area 30, and the two side sections 33 located at the same end are spaced apart to form a glue overflow buffer area 31.

[0042] In addition, the end surface isolation foam 3 is arranged in the middle of the battery cell 10 along the third direction Z, and the two overflowing glue buffers 31 are symmetrically distributed with the third direction Z as the axis. Designing the end surface isolation foam 3 in the middle of the battery cell 10 in the third direction Z can provide the maximum limit protection, prevent the battery pack 1 from shaking in the second direction Y, and improve the structural reliability of the entire battery pack.

[0043] In addition, the glue area 22 is filled with a potting glue 26, and the hardness of the potting glue 26 is less than the hardness of the base glue 14, so as to absorb expansion deformation and buffer. The battery pack 1 is also provided with a partition 13 on the side 11 of the battery cell 10 close to the first side plate 42 at the end of the first direction X, and the isolation foam 2 is bonded to the side of the partition 13 close to the first side plate 42.

[0044] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A battery pack, characterized in that: include: A box body (4), the box body (4) having a first direction (X) and a second direction (Y) intersecting each other, the box body (4) having a containing cavity (40), the box body (4) comprising a bottom plate (41), and first side plates (42) connected to both ends of the bottom plate (41) in the first direction (X); A battery pack (1), the battery pack (1) being arranged in the accommodating cavity (40), a bottom glue (14) being arranged between the battery pack (1) and the bottom plate (41); the battery pack (1) comprising a plurality of battery cells (10) arranged along the first direction (X), the battery cells (10) having side surfaces (11) arranged opposite to each other along the first direction (X); an isolation foam (2), the isolation foam (2) being installed between the side surface (11) of the battery cell (10) at the end of the battery pack (1) in the first direction (X) and the first side plate (42), the isolation foam (2) comprising a bottom edge (20) and two side edges (21) arranged in a U shape; The isolation foam (2) is provided with an opening facing away from the bottom plate (41); the side surface (11) of the battery cell, the first side plate (42) and the two side edges (21) enclose a glue filling area (22); the bottom edge (20) is spaced apart from the bottom plate (41) to prevent the bottom glue (14) from overflowing to the side surface (11).

2. The battery pack according to claim 1, characterized in that: The isolation foam (2) comprises a foam body (23) and a plastic bag (24), wherein the foam body (23) is compressed and arranged in the plastic bag (24), and the plastic bag (24) is also provided with a tearing hole (25) so that when the tearing hole (25) is opened, air can enter to cause the foam body (23) to rebound in a first direction (X).

3. The battery pack according to claim 1, characterized in that: The battery cell (10) is a square battery cell, the box body (4) has a third direction (Z), the first direction (X), the second direction (Y) and the third direction (Z) intersect each other; the bottom edge (20) is arranged flush with the edge of the side length of the side surface (11) along the second direction (Y), and the two side edges (21) are respectively arranged flush with the edges of the side length of the side surface (11) along the third direction (Z).

4. The battery pack according to claim 1, characterized in that: The battery pack (1) is provided with at least two rows of battery cells (10) arranged along a second direction (Y), and the side surfaces (11) of the battery cells at the ends of each row along the first direction (X) are provided with the isolation foam (2).

5. The battery pack according to claim 1, characterized in that: The box body (4) further comprises a second side plate (43) arranged opposite to each other along the second direction (Y); the battery cell (10) comprises an end surface (12) arranged opposite to each other along the second direction (Y); an end surface isolation foam (3) is further arranged between the end surface (12) of the battery cell (10) and the second side plate (43); a glue containing area (30) is provided in the middle of the end surface isolation foam (3); and an opening is provided on a side of the end surface isolation foam (3) facing away from the bottom plate (41).

6. The battery pack according to claim 5, characterized in that: The end surface isolation foam (3) is further provided with two overflow glue buffer areas (31), and the two overflow glue buffer areas (31) are respectively arranged on both sides of the glue containing area (30) in the first direction (X).

7. The battery pack according to claim 6, characterized in that: The end surface isolation foam (3) comprises a bottom section (32) and four side sections (33), wherein two of the side sections (33) are respectively vertically connected to one end of the bottom section (32) in the first direction (X), and the other two side sections (33) are respectively vertically connected to the other end of the bottom section (32) in the first direction (X), the two side sections (33) located in the middle of the first direction (X) form the glue containing area (30), and the two side sections (33) located at the same end are spaced apart to form the glue overflow buffer area (31).

8. The battery pack according to claim 6, characterized in that: The box body (4) has a third direction (Z), and the first direction (X), the second direction (Y) and the third direction (Z) intersect each other; the end surface isolation foam (3) is arranged at the middle position of the battery core (10) along the third direction (Z), and the two overflowing glue buffer areas (31) are symmetrically distributed with the third direction (Z) as the axis.

9. The battery pack according to claim 1, characterized in that: The glue pouring area (22) is filled with a potting glue (26), and the hardness of the potting glue (26) is less than the hardness of the base glue (14).

10. The battery pack according to claim 1, characterized in that: The battery pack (1) is also provided with a partition (13) on the side surface (11) of the battery cell (10) at the end in the first direction (X) close to the first side plate (42), and the isolation foam (2) is bonded to the side of the partition (13) close to the first side plate (42).

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