Battery pack and vehicle

Abstract

The utility model provides a battery pack and a vehicle, the battery pack comprises: a box body, which comprises a box body bottom plate and a box body side plate connected with each other, the box body bottom plate and the box body side plate enclose to form a mounting cavity, and the box body side plate comprises a box body inner side face facing the mounting cavity; the plurality of battery modules are arranged in the mounting cavity; each battery module comprises a plurality of mutually bonded battery cells, the outer side surface of any battery module consists of the side surfaces of the plurality of battery cells in the battery module, the outer side surface of any battery module comprises a module assembling surface, the module assembling surface is opposite to the inner side surface of the box body, and an assembling gap is formed between the module assembling surface and the inner side surface of the box body; a fixed insulating plate which is supported by the battery module and the side plate of the box body is inserted into the assembly gap; and the fixed insulating plate has a preset plate thickness which is used for meeting a target creepage distance between the battery cell and the box body. The battery pack is simple in assembly, high in integration level and high in space utilization rate.

Description

Technical Field

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

[0002] As the main power source of electric vehicles, how to efficiently utilize limited space and improve energy density is the key to meeting the long-range requirements of new energy electric vehicles.

[0003] In the prior art, most battery packs are composed of multiple battery cells to form a battery module, and then multiple battery modules are placed in a battery box to form a battery pack. Among them, when multiple battery cells are assembled into a battery module, the multiple battery cells are usually fixed in an end plate assembly, and then the end plates are locked and fixed from top to bottom at both ends of the end plate assembly to form a battery module, thereby realizing modular assembly of the battery pack. However, this assembly solution has many internal components in the battery pack, and has disadvantages such as low space utilization, complex assembly, and low integration rate. Another module-free battery pack solution usually relies on crossbeams or longitudinal beams to fix the battery cells with screws, which also has disadvantages such as low space utilization, complex assembly, and low integration rate. Utility Model Content

[0004] The technical problem solved by the utility model is to provide a battery pack and a vehicle with simple assembly, high integration and high space utilization.

[0005] In order to solve the above technical problems, the technical solution of the present utility model provides a battery pack, including: a box body, including a box body bottom plate and a box body side plate connected to each other, the box body bottom plate and the box body side plate enclose a mounting cavity, the box body side plate includes an inner side surface of the box body facing the mounting cavity; a plurality of battery modules arranged in the mounting cavity, the battery module including a plurality of battery cells bonded to each other; an assembly gap is provided between the battery module and the inner side surface of the box body, a fixed insulating plate supported by the battery module and the box body side plate is inserted in the assembly gap, and the fixed insulating plate has a preset plate thickness for meeting the target creepage distance between the battery cell and the box body.

[0006] Optionally, the fixed insulating plate includes a first fixed side surface abutting against the inner side surface of the box body, and the first fixed side surface and the inner side surface of the box body are arc surfaces that match each other.

[0007] Optionally, the fixed insulating plate is divided into a first zone, a second zone and a third zone in sequence along its height direction, the distance between the first zone and the bottom plate of the box is smaller than the distance between the third zone and the bottom plate of the box, the plate thickness of the fixed insulating plate in the first zone and the plate thickness in the third zone are both smaller than the plate thickness in the second zone, and the first fixed side surface of the first zone and at least part of the first fixed side surface of the second zone abut against the inner side surface of the box.

[0008] Optionally, the fixed insulating plate further includes: a second fixed side surface opposite to the first fixed side surface, and the second fixed side surface is used to directly or indirectly abut against the battery module.

[0009] Optionally, a first fixing sheet is attached to the second fixed side surface, and the first fixing sheet is made of a compressible and resilient elastic insulating material, so that the side plate of the box body and the battery module are interference fit.

[0010] Optionally, the total thickness consisting of the thickness of the first fixing plate in an uncompressed state and the thickness of the fixed insulating plate in the second region is greater than the gap width of the assembly gap.

[0011] Optionally, in any battery module, several battery cells are arranged in sequence along the thickness direction of the battery cells, and a second fixing plate is arranged between adjacent battery cells. The second fixing plate is a compressible and resilient elastic material, and the second fixing plate has double-sided adhesive. The adjacent battery cells are respectively adhered to both sides of the second fixing plate through the double-sided adhesive.

[0012] Optionally, the plurality of battery modules include a first battery module and a second battery module, the thickness direction of the battery cells of the first battery module is parallel to the first direction, the thickness direction of the battery cells of the second battery module is parallel to the second direction, and the first direction and the second direction are perpendicular to each other.

[0013] Optionally, an insulating member is provided between adjacent battery modules.

[0014] Optionally, the insulating member is an elastic insulating sheet, an epoxy board, or a stacked assembly of an elastic insulating sheet and an epoxy board, and the elastic insulating sheet is a compressible and resilient elastic insulating material.

[0015] Optionally, the bottom plate of the box is provided with a battery cell avoidance area, and the outer surface of any battery module is composed of the side surfaces of several battery cells in the battery module. The outer surface of any battery module includes a module assembly surface and a module inner side surface. The module assembly surface is opposite to the inner side surface of the box and an assembly gap is provided between them. The inner side surface of the module is opposite to other battery modules, and part of the inner side surfaces of the modules of the several battery modules are enclosed to form an avoidance gap. The avoidance gap is used to avoid the battery cell avoidance area, and the inner side surface of the module at the avoidance gap is pasted with an outer epoxy board.

[0016] Optionally, the cell surfaces of the cells in the battery module face away from the box bottom plate, structural adhesive is laid on the surface of the box bottom plate, and the battery module is bonded to the box bottom plate through the structural adhesive.

[0017] Optionally, the fixed insulating plate is bonded to the bottom plate of the box through the structural adhesive.

[0018] Optionally, it further includes: a box cover fixed to the box body, wherein the box cover is sealed above the installation cavity.

[0019] The technical solution of the present invention also provides a vehicle, comprising: a battery pack as described above.

[0020] Compared with the prior art, the technical solution of the embodiment of the utility model has the following beneficial effects:

[0021] In the battery pack and vehicle provided by the technical solution of the present invention, since the battery module includes a number of battery cells bonded to each other, and a fixed insulating plate supported by the battery module and the side plate of the electric box is inserted in the assembly gap between the battery module and the inner side surface of the box body of the electric box side plate, the battery module is formed by the mutual bonding between the battery cells, and the battery module and the box body are fastened to each other through the fixed insulating plate. Therefore, not only is the structure reliable, the assembly is simple, and a large amount of work time is saved, but also very few internal components are used to realize the assembly and fixation of the battery cells, so that the space utilization rate is high, the integration is high, and the battery energy density is large. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is an assembly diagram of a battery pack according to an embodiment of the present invention;

[0023] Figure 2 and Figure 3 This is an exploded view of a battery pack according to an embodiment of the present invention;

[0024] Figure 4 It is a side view of a fixed insulating plate according to an embodiment of the present invention.

[0025] Description of reference numerals:

[0026] 10-box; 11-box bottom plate; 12-box side plate; 121-box inner side;

[0027] 20-battery module; 201-module assembly surface; 21-battery cell;

[0028] 30-installation cavity; 31-assembly gap; 32-avoidance gap;

[0029] 40-fixed insulating plate; 41-first fixed side; 42-second fixed side;

[0030] 51-first fixing plate; 52-second fixing plate; 53-insulating member; 54-outer epoxy plate;

[0031] 60-box cover;

[0032] H-height direction; X-first direction; Y-second direction. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and beneficial effects of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described in this specification are only for the purpose of explaining the present invention and are not intended to limit the present invention.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to 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 or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.

[0035] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections, direct connections, or indirect connections through an intermediate medium; they may refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0036] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0037] Figure 1This is an assembly diagram of a battery pack according to an embodiment of the present invention. Figure 2 and Figure 3 This is an exploded view of a battery pack according to an embodiment of the present invention. Figure 1 and Figure 3 The box cover is not shown.

[0038] Please refer to Figures 1 to 3 The battery pack includes: a box body 10, a plurality of battery modules 20 and a fixed insulating plate 40.

[0039] The box body 10 includes a box body bottom plate 11 and a box body side plate 12 connected to each other.

[0040] The box bottom plate 11 and the box side plate 12 enclose a mounting cavity 30 , and the box side plate 12 includes an inner side surface 121 facing the mounting cavity 30 .

[0041] In some embodiments, a first flange turned outward is formed on the side of the box side panel 12 facing away from the box bottom panel 11 , and a plurality of first fixing holes are provided on the first flange.

[0042] A plurality of battery modules 20 are disposed in the mounting cavity 30 , and an assembly gap 31 is defined between the battery modules 20 and the inner side surface 121 of the box body.

[0043] The battery module 20 includes a plurality of battery cells 21 bonded to each other.

[0044] The outer surface of any battery module 20 is composed of the side surfaces of a plurality of battery cells 21 in the battery module 20 , and the outer surface of any battery module 20 includes a module assembly surface 201 .

[0045] Specifically, the module assembly surface 201 faces the inner side surface 121 of the box body, and an assembly gap 31 is defined between the module assembly surface 201 and the inner side surface 121 of the box body.

[0046] A fixed insulating plate 40 is inserted into the assembly gap 31 . The fixed insulating plate 40 has a preset thickness for satisfying a target creepage distance between the battery cell 21 and the box 10 . The fixed insulating plate 40 is supported by the battery module 20 and the box side plate 12 .

[0047] Since the battery module 20 includes a number of battery cells 21 bonded to each other, and a fixed insulating plate 40 supported by the battery module 20 and the side plate of the electric box is inserted in the assembly gap 31 between the battery module 20 and the inner side surface 121 of the box side plate of the electric box, the battery module 20 is formed by the mutual bonding between the battery cells 21, and the battery module 20 and the box body 10 are fastened to each other through the fixed insulating plate 40. Therefore, not only is the structure reliable, the assembly is simple, and the work time is greatly saved, but also very few internal components are used to realize the assembly and fixation of the battery cells 21, so that the space utilization rate is high, the integration is high, and the battery energy density is large.

[0048] In particular, compared with the prior art, this embodiment eliminates the end plates and end plate integration, cross beams, longitudinal beams, and assembly fasteners of the battery cells 21 or battery modules 20 while achieving fixed assembly of the battery pack. This greatly reduces the internal components of the battery pack, and reduces the process complexity and assembly difficulty.

[0049] In addition, the fixed insulating plate 40 also plays a role in protecting the battery module 20 and insulating it from the outside. Moreover, since the fixed insulating plate 40 has a preset plate thickness for meeting the target creepage distance between the battery cell 21 and the box body 10, the creepage distance between the battery cell 21 and the box body 10 can be adjusted by adjusting the plate thickness of the fixed insulating plate 40.

[0050] In some embodiments, in any of the plurality of battery modules 20, the plurality of battery cells 21 are arranged sequentially along the thickness direction of the battery cells 21, and a second fixing sheet 52 is disposed between adjacent battery cells 21. The second fixing sheet 52 is made of a compressible and resilient elastic material and has double-sided adhesive. Adjacent battery cells 21 are adhered to both sides of the second fixing sheet 52 using double-sided adhesive.

[0051] The battery cells 21 are bonded to each other by attaching adjacent battery cells 21 to both sides of the second fixing sheet 52 using double-sided adhesive. Furthermore, because the second fixing sheet 52 is made of a compressible and resilient elastic material, the second fixing sheet 52 can be squeezed and compressed in the thickness direction of the battery cells 21 by the fixed insulating plate 40, creating an interference fit between the battery module 20 and the housing 10 along the thickness direction of the battery cells 21 of the battery module 20. This effectively increases the reliability of the fixation between the battery module 20 and the housing 10.

[0052] Furthermore, the plurality of battery modules 20 include a first battery module 20 and a second battery module 20 .

[0053] The thickness direction of the battery cells 21 in the first battery module 20 is parallel to the first direction X, and the thickness direction of the battery cells 2121 in the second battery module 20 is parallel to the second direction Y.

[0054] The first direction X and the second direction Y are perpendicular to each other.

[0055] Since the thickness direction of the battery cell 21 in the first battery module 20 is parallel to the first direction X, and the thickness direction of the battery cell 2121 in the second battery module 20 is parallel to the second direction Y, the restriction of the length dimension of the battery cell 21 on the size of the box 10 is reduced, thereby improving the dimensional freedom of the box 10.

[0056] In some embodiments, an insulating member 53 is disposed between adjacent battery modules 20 to insulate the battery modules 20 .

[0057] Specifically, in other embodiments, the insulating member 53 is an elastic insulating sheet, an epoxy board, or a stacked assembly of an elastic insulating sheet and an epoxy board, wherein the elastic insulating sheet is a compressible and resilient elastic insulating material.

[0058] When the insulating member 53 comprises an epoxy plate, it helps to strengthen the structural strength of the battery pack. When the insulating member 53 comprises an elastic insulating sheet, similar to the function of the second fixing sheet 52, the elastic insulating sheet can be squeezed and compressed along the length of the battery cells 21 in the battery module 20 by fixing the insulating plate 40, so that the battery module 20 and the case 10 also have an interference fit along the length of the battery cells 21 of the battery module 20. As a result, the case 10 and the battery module 20 have an interference fit in all directions, thereby further effectively increasing the reliability of the fixation between the battery module 20 and the case 10.

[0059] In some embodiments, the outer surface of any battery module 20 further includes an inner side surface facing other battery modules 20 , and portions of the inner side surfaces of several battery modules 20 enclose a clearance gap 32 .

[0060] The box bottom plate 11 is provided with a battery cell avoidance area (not shown), and the avoidance gap 32 is used to avoid the avoidance area of ​​the bottom plate.

[0061] Furthermore, an outer epoxy sheet 54 is attached to the inner side of the module, avoiding the notch 32. Therefore, the outer surface of the battery module 20, except for the module assembly surface 201, is also covered by the epoxy sheet, thereby ensuring insulation between the battery module 20 and the outside and protecting all outer surfaces of the battery module 20.

[0062] In some embodiments, the battery cells 21 in the battery module 20 face away from the bottom plate 11 of the box body, and structural adhesive is applied to the surface of the bottom plate 11. The battery module 20 is bonded to the bottom plate 11 through the structural adhesive, thereby further strengthening the fixation between the battery module 20 and the box body 10.

[0063] Furthermore, the fixed insulating plate 40 is bonded to the box bottom plate 11 by structural adhesive, thereby further strengthening the fixation between the fixed insulating plate 40 and the box 10 and further ensuring the insulation effect of the fixed insulating plate 40.

[0064] Please refer to Figure 4In some embodiments, the side surfaces of the fixed insulating plate 40 include a first fixed side surface 41 that abuts the inner side surface 121 of the housing. The first fixed side surface 41 and the inner side surface 121 of the housing are curved surfaces that fit together. Therefore, the fixed insulating plate 40 better fits and fills the assembly gap 31, thereby improving the reliability of the fixation between the battery module 20 and the housing 10.

[0065] In some embodiments, the side surface of the fixed insulating plate 40 further includes a second fixed side surface 42. The second fixed side surface 42 is opposite the first fixed side surface 41 and directly abuts the module assembly surface 201. This ensures that the fixed insulating plate 40 inserted in the assembly gap 31 is abutted by the battery module 20 and the box side panel 12.

[0066] In some embodiments, the second fixing side surface 42 is configured to indirectly abut against the module mounting surface 201 .

[0067] Specifically, a first fixing plate 51 is attached to the second fixed side surface 42. The first fixing plate 51 is made of a compressible and resilient elastic insulating material. This ensures that the fixed insulating plate 40 inserted in the assembly gap 31 is abutted against the battery module 20 and the case side panel 12. Furthermore, the first fixing plate 51 also absorbs the tolerances of the fixed insulating plate 40, the case 10, and the battery cell 21 module, achieving an interference fit between the case side panel 12 and the battery module 20, further enhancing assembly and fixing reliability.

[0068] Furthermore, the total thickness consisting of the thickness of the first fixing plate 51 in the uncompressed state and the thickness of the fixed insulating plate 40 in the second region is greater than the gap width of the assembly gap 31 .

[0069] In some embodiments, the fixed insulating plate 40 is divided into a first zone, a second zone, and a third zone in sequence along its height direction H. The distance between the first zone and the bottom plate 11 of the box is smaller than the distance between the third zone and the bottom plate 11 of the box. The plate thickness of the fixed insulating plate 40 in the first zone and the plate thickness in the third zone are both smaller than the plate thickness in the second zone. Moreover, the first fixed side surface 41 of the first zone and at least part of the second zone abuts against the inner side surface 121 of the box.

[0070] Since the plate thickness of the fixed insulating plate 40 in the first zone and the plate thickness in the third zone are both smaller than the plate thickness in the second zone, and the first fixed side surface 41 in the first zone and at least part of the second zone abuts against the inner side surface 121 of the box body, the fixed insulating plate 40 can be better adapted to and fill the assembly gap 31, thereby facilitating the insertion of the fixed insulating plate 40 into the assembly gap 31.

[0071] Similarly, since the distance between the first area and the box bottom plate 11 is smaller than the distance between the third area and the box bottom plate 11 , it is convenient for the box cover 60 to cover the battery module 20 and the fixed insulating plate 40 as described later.

[0072] Specifically, the fixed insulating plate 40 may be injection molded to achieve adjustment according to the assembly gap 31 or other design requirements.

[0073] Please continue to refer to Figure 2 The battery pack further includes: a box cover 60 fixed to the box body 10 , and the box cover 60 seals above the installation cavity 30 .

[0074] In some embodiments, the opening of the box cover 60 is formed with an outward-turned second flange, the second flange is in contact with the first flange, and second fixing holes corresponding to the first fixing holes are provided on the second flange. Fasteners are passed between the first fixing holes and the second fixing holes to fix the box cover 60 and the box body 10 to each other.

[0075] Correspondingly, an embodiment of the present invention also provides a vehicle including the above-mentioned battery pack.

[0076] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0077] The above embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that variations and improvements are possible within the scope of the present invention, as would be apparent to those skilled in the art. These variations and improvements fall within the scope of the present invention. Therefore, the scope of the present invention shall be determined by the appended claims.

Claims

1. A battery pack, characterized in that: include: The box body comprises a box bottom plate and a box side plate connected to each other, wherein the box bottom plate and the box side plate enclose an installation cavity, and the box side plate comprises an inner side surface of the box body facing the installation cavity; A plurality of battery modules are arranged in the mounting cavity, and the battery modules include a plurality of battery cells bonded to each other. An assembly gap is provided between the battery modules and the inner side surface of the box body. A fixed insulating plate supported by the battery modules and the side plate of the box body is inserted in the assembly gap. The fixed insulating plate has a preset plate thickness for meeting the target creepage distance between the battery cells and the box body.

2. The battery pack according to claim 1, wherein: The fixed insulating plate includes a first fixed side surface abutting against the inner side surface of the box, and the first fixed side surface and the inner side surface of the box are arc surfaces that are adapted to each other.

3. The battery pack according to claim 2, wherein: The fixed insulating plate is divided into a first zone, a second zone and a third zone in sequence along its height direction. The distance between the first zone and the bottom plate of the box is smaller than the distance between the third zone and the bottom plate of the box. The plate thickness of the fixed insulating plate in the first zone and the plate thickness in the third zone are both smaller than the plate thickness in the second zone. Moreover, the first fixed side surface of the first zone and at least part of the first fixed side surface of the second zone abut against the inner side surface of the box.

4. The battery pack according to claim 2, wherein: The fixed insulating plate further includes: a second fixed side surface opposite to the first fixed side surface, and the second fixed side surface is used to directly or indirectly abut against the battery module.

5. The battery pack according to claim 4, wherein: The second fixed side is adhered to a first fixing sheet, which is made of a compressible and resilient elastic insulating material, so that the box side plate and the battery module are interference-fitted.

6. The battery pack according to claim 5, wherein: The total thickness consisting of the thickness of the first fixing plate in an uncompressed state and the thickness of the fixing insulating plate in the second region is greater than the gap width of the assembly gap.

7. The battery pack according to any one of claims 1 to 6, wherein: In any battery module, several battery cells are arranged in sequence along the thickness direction of the battery cells, and a second fixing plate is arranged between adjacent battery cells. The second fixing plate is a compressible and resilient elastic material, and the second fixing plate has double-sided adhesive. The adjacent battery cells are respectively adhered to both sides of the second fixing plate through the double-sided adhesive.

8. The battery pack according to claim 7, wherein: The plurality of battery modules include a first battery module and a second battery module. The thickness direction of the battery cells of the first battery module is parallel to a first direction, the thickness direction of the battery cells of the second battery module is parallel to a second direction, and the first direction and the second direction are perpendicular to each other.

9. The battery pack according to claim 7, wherein: An insulating member is provided between adjacent battery modules.

10. The battery pack according to claim 9, wherein: The insulating member is an elastic insulating sheet, an epoxy board, or a stacked assembly of an elastic insulating sheet and an epoxy board. The elastic insulating sheet is a compressible and resilient elastic insulating material.

11. The battery pack according to claim 10, wherein: The bottom plate of the box is provided with a battery cell avoidance area, and the outer surface of any battery module is composed of the side surfaces of several battery cells in the battery module. The outer surface of any battery module includes a module assembly surface and an inner side surface of the module. The module assembly surface is opposite to the inner side surface of the box and an assembly gap is provided between them. The inner side surface of the module is opposite to other battery modules, and part of the inner side surfaces of the modules of the several battery modules are enclosed to form an avoidance gap. The avoidance gap is used to avoid the battery cell avoidance area, and the inner side surface of the module at the avoidance gap is pasted with an outer epoxy board.

12. The battery pack according to any one of claims 1 to 6, wherein: The cell surfaces of the cells in the battery module face away from the box bottom plate, structural adhesive is laid on the surface of the box bottom plate, and the battery module is bonded to the box bottom plate through the structural adhesive.

13. The battery pack according to claim 12, wherein: The fixed insulating plate is bonded to the bottom plate of the box body through the structural adhesive.

14. The battery pack according to claim 1, wherein: Also includes: A box cover is fixed to the box body, and the box cover is sealed above the installation cavity.

15. A vehicle, characterized in that: include: The battery pack according to any one of claims 1 to 14.

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