Battery pack assembly method, battery pack and vehicle

Abstract

The present invention discloses a battery pack assembly method, a battery pack and a vehicle, wherein the battery pack includes a box body and a battery module, the box body is provided with a cavity, the battery module includes foam and a plurality of battery cells, and foam is provided between adjacent battery cells, and the battery pack assembly method includes the following steps: inserting the battery module into an insulating bag; evacuating the insulating bag so that the foam is compressed to reduce the volume of the battery module; after inserting the battery module with reduced volume into the cavity, releasing the vacuum state, and exposing the positive and negative electrodes of the battery module. The battery pack assembly method of the embodiment of the present invention first installs the battery module into the insulating bag before assembling the battery module in the cavity, and compresses the foam in the battery module by evacuating the insulating bag, thereby reducing the volume of the entire battery module, facilitating the assembly of the battery module into the box body, improving the assembly efficiency and achieving zero-gap assembly.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery pack production, and specifically relates to a battery pack assembly method, a battery pack and a vehicle. Background Art

[0002] During the production process of a battery pack, multiple battery cells are usually combined to form a battery module, and the battery module is assembled in a box to form a battery pack. An excellent box needs to meet the requirements of easy assembly of the battery module and being able to provide the battery module with good pre-tightening force.

[0003] In the prior art, in order to enable the box to continuously apply pre-tightening force to the battery module, the size of the box is usually designed to be equivalent to the size of the battery module or slightly larger than the size of the battery module. However, during the assembly of the battery pack, since the box and the battery module are both rigid structures with small elastic deformation capacity, the assembly of the battery pack is very difficult. It is difficult to insert the battery module into the box by manpower, and if mechanical tooling is used to apply mechanical force, on the one hand, it is easy to cause damage to the box or the battery module; on the other hand, even if the battery module is inserted into the box, it is very difficult to disassemble the battery module, which increases the difficulty of assembly and disassembly and reduces the efficiency of assembly and disassembly.

[0004] In order to solve the above problems, some battery packs choose to reserve a larger assembly gap in the box, that is, the size of the box is set much larger than the size of the battery module to facilitate the assembly of the battery module. Although this structure can improve the efficiency of assembly and disassembly, the box cannot provide a good pre-tightening force for the battery module, and reduces the volume utilization of the battery pack. The volume of the battery pack is increased, resulting in the battery pack occupying a larger space at the bottom of the vehicle, reducing the practicality of the battery pack. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a battery pack assembly method, and the battery pack assembled by the battery pack assembly method can improve the assembly efficiency while ensuring that the box can continuously apply pre-tightening force to the battery module, solving the technical problems in the prior art that the battery pack is difficult to assemble, the box cannot give the battery module a good pre-tightening force after the battery pack is assembled, and the battery pack volume utilization rate is low.

[0006] A second objective of the present invention is to provide a battery pack.

[0007] A third object of the present invention is to provide a vehicle.

[0008] According to an embodiment of the present invention, a method for assembling a battery pack comprises a box body and a battery module, wherein the box body is provided with a cavity, and the battery module comprises foam and a plurality of battery cells, wherein the foam is provided between adjacent battery cells, and the method for assembling comprises the following steps: placing the battery module into an insulating bag; evacuating the insulating bag so that the foam is compressed to reduce the volume of the battery module; after inserting the battery module with a reduced volume into the cavity, releasing the vacuum state so that the positive and negative electrodes of the battery module are exposed.

[0009] According to the assembly method of the battery pack of an embodiment of the present invention, since foam is arranged between adjacent battery cells, the battery module is first placed in an insulating bag before being assembled in the cavity, and the foam in the battery module is compressed by evacuating the insulating bag, thereby reducing the volume of the entire battery module, facilitating the assembly of the battery module into the box, and improving the assembly efficiency. After the battery module is assembled in the cavity, the vacuum state is released. At this time, the foam can use its own high resilience to restore the battery module to its original volume, and the battery module abuts against the inside of the box to achieve zero-gap assembly, thereby improving the volume utilization of the battery pack and ensuring that the box can continuously apply a pre-tightening force to the battery module. Moreover, through the above-mentioned arrangement, the size of the box can be designed to be equivalent to the size of the battery module, thereby reducing the volume of the box, thereby reducing the volume of the battery pack and improving practicality.

[0010] According to the battery pack assembly method of one embodiment of the present invention, a portion to be torn is provided on the insulation bag, so that the portion to be torn is broken to release the vacuum state.

[0011] Optionally, the portion to be torn is formed in a ring shape, and the portion to be torn is broken to remove a portion of the insulation bag to expose the positive and negative electrodes.

[0012] Optionally, a handle is provided on the insulation bag, and the portion to be torn is damaged by pulling the handle.

[0013] According to the battery pack assembly method of one embodiment of the present invention, the insulation bag is coated with a fireproof layer.

[0014] A battery pack according to an embodiment of the present invention comprises: a box body, wherein a cavity is provided in the box body; a battery module, wherein the battery module is arranged in the cavity, the battery module comprises foam and a plurality of battery cells, the foam is arranged between adjacent battery cells, the battery module is covered with an insulating bag, and the positive and negative electrodes of the battery module extend out of the insulating bag.

[0015] According to the battery pack of the embodiment of the present invention, by setting the battery module in the cavity formed by the box, the box can protect the battery module, extend the service life of the battery module and improve the safety of the battery module, and foam is arranged between adjacent battery cells, and the elastic deformation force of the foam can be used to change the volume of the battery module, while improving the battery pack assembly efficiency, it can also ensure that the box can continuously apply pre-tightening force to the battery module, and the positive and negative electrodes of the battery module are extended out of the insulating bag to facilitate connection with other battery modules to form a battery pack. The battery pack of the present application is simple to assemble, small in size and light in weight.

[0016] According to a battery pack of an embodiment of the present invention, a plurality of sequentially arranged cavities are provided in the box body, and the battery module coated with an insulating bag is provided in each of the cavities.

[0017] Optionally, the insulation bag is clamped between the inner wall of the cavity and the battery module.

[0018] A vehicle according to an embodiment of the present invention includes the aforementioned battery pack.

[0019] According to the vehicle of the embodiment of the present invention, by adopting the aforementioned battery pack, the battery pack will not occupy too much space at the bottom of the vehicle, and can achieve lightweight of the vehicle, increase the vehicle's cruising range and enhance the driving experience.

[0020] Additional aspects and advantages of the invention will become apparent from the following description, or may be learned by practice of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 The figure is a flow chart of a method for assembling a battery pack according to an embodiment of the present invention.

[0023] Figure 2 An exploded view of a battery module and an insulation bag according to an embodiment of the present invention.

[0024] Figure 3 FIG. 1 is a schematic structural diagram of a battery pack according to an embodiment of the present invention.

[0025] Figure 4 for Figure 3 A partial enlarged view of area Ⅰ in the middle.

[0026] Reference numerals:

[0027] 1000, battery pack;

[0028] 100, box body; 110, cavity;

[0029] 200, battery module; 210, foam; 220, battery cell;

[0030] 300. Insulation bag; 310. Place to be torn; 320. Handle position. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0032] In the description of the present invention, it is necessary to understand that the orientation or positional relationship indicated by the terms "thickness", "up", "down", "front", "back", "top", "bottom", "inside", "outside", "circumferential", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 a limitation on the present invention.

[0033] The following describes an assembly method of a battery pack 1000 according to an embodiment of the present invention with reference to the accompanying drawings.

[0034] According to an embodiment of the present invention, a battery pack 1000 assembly method is combined with Figure 2 and Figure 3 As shown, the battery pack 1000 includes a box body 100 and a battery module 200 , and a cavity 110 is defined in the box body 100 .

[0035] like Figure 2 As shown, the battery module 200 includes a foam 210 and a plurality of battery cells 220 , and foam 210 is disposed between adjacent battery cells 220 .

[0036] like Figure 1 As shown, the assembly method of the battery pack 1000 includes the following steps:

[0037] Step S1: putting the battery module 200 into the insulation bag 300 .

[0038] Step S2 : evacuating the insulation bag 300 so that the foam 210 is compressed to reduce the volume of the battery module 200 .

[0039] Step S3: After the battery module 200 with a reduced volume is inserted into the cavity 110 , the vacuum state is released, and the positive and negative electrodes of the battery module 200 are exposed.

[0040] It can be seen from the above method that the assembly method of the battery pack 1000 of the embodiment of the present invention is that the foam 210 is arranged between adjacent battery cells 220, and the foam 210 will be deformed under the action of external force, and can restore the original size and shape when the external force is eliminated. Therefore, the present application utilizes the characteristics of the foam 210 itself, and before assembling the battery module 200 in the cavity 110, the battery module 200 is first placed in the insulation bag 300, and the foam 210 in the battery module 200 is evacuated by vacuumizing the insulation bag 300. 10 and the gaps between adjacent battery cells 220 are compressed to reduce the volume of the foam 210, thereby reducing the distance between adjacent battery cells 220, so that the overall size of the battery module 200 is reduced; during the specific assembly process of the battery pack 1000, the battery module 200 with a smaller volume can be smoothly assembled into the cavity 110 of the box body 100, thereby improving the assembly efficiency and reducing the friction between the battery module 200 and the box body 100, reducing wear and tear, and extending the service life of the battery module 200 and the box body 100.

[0041] After the battery module 200 is assembled in the cavity 110, the vacuum state of the insulating bag 300 is released. At this time, the foam 210 can use its own high resilience to restore its original size and shape, thereby increasing the distance between adjacent battery cells 220, so that the battery module 200 returns to its original volume. The battery module 200 can abut against the inside of the box 100 to achieve zero-gap assembly, thereby improving the volume utilization of the battery pack 1000.

[0042] Since the battery module 200 is in contact with the interior of the box 100 , the side wall of the box 100 can provide a good pre-tightening force to the battery module 200 , so that the position of the battery module 200 is stable.

[0043] It should be noted that by adopting the above-mentioned assembly method to assemble the battery pack 1000, during the production process of the box body 100, the size of the box body 100 can be produced to be equivalent to the size of the battery module 200. The battery module 200 can be quickly and accurately assembled into the box body 100 without deliberately producing a larger box body 100. While reducing the difficulty of assembly, the volume of the box body 100 can also be reduced. On the first hand, the material used for the box body 100 is reduced, saving production costs; on the second hand, the volume of the battery pack 1000 can be reduced, and the battery pack 1000 can be installed on the vehicle without occupying too much space at the bottom of the vehicle, thereby improving the practicality of the battery pack 1000; on the third hand, the weight of the battery pack 1000 can also be reduced, achieving lightweight battery pack 1000 and improving the vehicle's cruising range.

[0044] By exposing the positive and negative electrodes of the battery module 200 , it is convenient to connect the battery module 200 with adjacent battery modules 200 through the positive and negative electrodes to form the battery pack 1000 .

[0045] It can be understood that when assembling the battery pack 1000 using the assembly method of the battery pack 1000 of the present application, there will be no technical problems such as assembly difficulties or the case 100 being unable to provide the battery module 200 with good pre-tightening force. The battery pack 1000 assembled using the above-mentioned assembly method can improve the assembly efficiency of the battery pack 1000 while ensuring that the case 100 can provide the battery module 200 with good pre-tightening force, thereby achieving zero-gap assembly, improving the volume utilization of the battery pack 1000, and reducing the volume of the battery pack 1000.

[0046] In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0047] Optionally, an opening (not shown in the figure) is provided at one end of the insulating bag 300, and a sealing structure is provided at the opening. The sealing structure is used to open or close the opening. When the battery module 200 needs to be loaded into the insulating bag 300, the opening is opened through the sealing structure, and the battery module 200 is loaded into the interior of the insulating bag 300 through the opening; after the battery module 200 is loaded into the interior of the insulating bag 300, the opening is closed by the sealing structure, so that the insulating bag 300 forms a closed structure, which is convenient for the subsequent vacuuming of the insulating bag 300.

[0048] Optionally, an air valve (not shown in the figure) is provided on the insulation bag 300. During the process of evacuating the insulation bag 300, a vacuum pump can be used. The vacuum pump is connected to the air valve, and the air in the insulation bag 300 can be extracted by the operation of the vacuum pump.

[0049] The main principle is to extract the air inside the foam 210 and use the atmospheric pressure to flatten the originally expanded foam 210, thereby reducing the volume of the foam 210, thereby reducing the distance between adjacent battery cells 220, and reducing the overall size of the battery module 200, ensuring that the battery module 200 is smoothly inserted into the cavity 110, thereby improving the assembly efficiency of the battery pack 1000.

[0050] Optionally, the air valve is a one-way air extraction valve, ensuring that the air in the insulation bag 300 can only be extracted in one direction through the air valve to prevent the gas in the insulation bag 300 from flowing back. When the vacuum state of the insulation bag 300 is not released, the insulation bag 300 is always in a vacuum state, which facilitates the insertion of the battery module 200 into the cavity 110.

[0051] Optionally, the insulation bag 300 can be made of insulating materials such as polypropylene, polyethylene terephthalate or polyimide. The above materials can ensure that the insulation bag 300 has a good insulation effect, ensuring that when the battery pack 1000 is moved or hit, two adjacent battery modules 200 will not contact each other and cause an internal short circuit, thereby extending the service life of the battery module 200 and improving the safety of the battery module 200.

[0052] In some embodiments of the present invention, Figure 2 and Figure 3 As shown, the insulating bag 300 is provided with a to-be-torn portion 310, and the to-be-torn portion 310 is broken to release the vacuum state. That is, after the reduced-volume battery module 200 is inserted into the cavity 110, if the vacuum state of the insulating bag 300 needs to be released, the to-be-torn portion 310 only needs to be broken, and the insulating bag 300 can release the vacuum state, and the foam 210 uses its own high resilience to restore the original size and shape, so that the battery module 200 is restored to its original volume, and the battery module 200 and the box 100 are assembled with zero gap.

[0053] Of course, since one end of the insulation bag 300 is provided with an opening, a sealing structure is provided at the opening. When the vacuum state of the insulation bag 300 needs to be released, the opening can also be opened through the sealing structure, and then the outside air can enter the insulation bag 300 through the opening to release the vacuum state of the insulation bag 300, and the foam 210 restores its original size and shape, so that the battery module 200 returns to its original volume.

[0054] It should be noted that the purpose of releasing the vacuum state of the insulating bag 300 through the to-be-torn portion 310 is mainly to remove a portion of the insulating bag 300, to ensure that when the vacuum state of the insulating bag 300 is released, the positive and negative electrodes of the battery module 200 can be exposed outside the insulating bag 300, so as to facilitate the connection of adjacent battery modules 200 through the positive and negative electrodes.

[0055] Optionally, the to-be-torn portion 310 is formed in a ring shape, and the to-be-torn portion 310 is broken to remove a portion of the insulation bag 300 to expose the positive and negative electrodes. The ring shape mentioned here means that the to-be-torn portion 310 is arranged around the insulation bag 300 in a circle, and when the to-be-torn portion 310 is broken, the insulation bags 300 located on both sides of the to-be-torn portion 310 are separated, and the insulation bags 300 close to the positive and negative electrodes of the battery module 200 are removed, so that the positive and negative electrodes of the battery module 200 are exposed.

[0056] It should be noted that the above-mentioned damage at the tearing point 310 and fracture at the tearing point 310 are two different states. The damage at the tearing point 310 refers to the appearance of a hole in the insulating bag 300 at the tearing point 310. When the tearing point 310 begins to be damaged, the vacuum state of the insulating bag 300 is released, but the positive and negative poles of the battery module 200 will not be exposed outside the insulating bag 300; when the tearing point 310 switches from damage to fracture, the positive and negative poles of the battery module 200 will be exposed outside the insulating bag 300.

[0057] Alternatively, if Figure 4As shown, the insulating bag 300 is provided with a handle 320, and the to-be-torn portion 310 is damaged and broken by pulling the handle 320. When the user needs to release the vacuum state of the insulating bag 300, the handle 320 increases the contact area between the user and the insulating bag 300. The user can apply force on the insulating bag 300 through the handle 320 to ensure that the to-be-torn portion 310 can be smoothly damaged to release the vacuum state of the insulating bag 300. Then the user continues to apply force to switch the to-be-torn portion 310 from the damaged state to the broken state, so as to separate the insulating bag 300 located on both sides of the to-be-torn portion 310, and the positive and negative electrodes of the battery module 200 can be exposed outside the insulating bag 300.

[0058] Alternatively, if Figure 4 As shown, the handle 320 is disposed at one end of the insulation bag 300 and extends in a direction away from the insulation bag 300. By increasing the area of ​​the handle 320, it is convenient for the user to contact the handle 320 and apply a force to damage and break the to-be-torn portion 310 through the handle 320, so that the to-be-torn portion 310 can be damaged and broken smoothly.

[0059] Optionally, combined Figure 3 and Figure 4 As shown, the to-be-torn portion 310 is disposed at one end of the insulation bag 300 and is close to the handle portion 320 . The distance between the tearing portion 310 and the handle portion 320 is reduced. On the one hand, when the user pulls the handle portion 320, the tearing portion 310 can be damaged and broken smoothly. On the other hand, because the handle portion 320 is pulled after the battery module 200 is inserted into the cavity 110 to damage the tearing portion 310, when the tearing portion 310 is damaged, the battery module 200 will abut against the inner wall of the box body 100. At this time, the battery module 200 will drive the insulating bag 300 to abut against the inner wall of the box body 100. The above arrangement can reduce the contact area between the tearing portion 310 and the handle portion 320 and the box body 100, so as to ensure that after the tearing portion 310 is broken, the insulating bag 300 located between the tearing portion 310 and the handle portion 320 can be smoothly removed from the box body 100 to expose the positive and negative poles of the battery module 200.

[0060] Of course, the distance between the tearing portion 310 and the handle 320 should not be too small. If the distance between the tearing portion 310 and the handle 320 is too small, the positive and negative electrodes of the battery module 200 cannot be exposed after the insulation bag 300 between the tearing portion 310 and the handle 320 is removed.

[0061] It should be noted that there is no specific restriction on the distance between the tearing portion 310 and the handle position 320, as long as it is ensured that when the tearing portion 310 is broken, the insulating bag 300 located between the tearing portion 310 and the handle position 320 can be smoothly removed from the box body 100 and the positive and negative poles of the battery module 200 can be exposed on the outside of the insulating bag 300.

[0062] Optionally, during the production of the insulation bag 300, the thickness of the insulation bag 300 at the to-be-torn position 310 may be set to be smaller than the thickness of other positions of the insulation bag 300, so as to form the to-be-torn position 310. It is ensured that when the user pulls the handle position 320, the insulation bag 300 can be damaged and broken from the to-be-torn position 310.

[0063] In some embodiments of the present invention, a fireproof layer is coated on the insulation bag 300. The fireproof layer can effectively block the thermal runaway propagation path. When the battery pack 1000 has thermal runaway, the insulation bag 300 coated with the fireproof layer can effectively prevent the spread of flames and heat, thereby improving the safety of the battery module 200. When the battery cell 220 has thermal runaway, the insulation bag 300 can also effectively ensure that the flames and heat will not be transmitted to the outside of the battery module 200, thereby not endangering the safety of the user.

[0064] Optionally, during the production of the battery module 200, Teflon may be sprayed on the surface of the insulation bag 300 or mica paper may be applied to form a high-temperature fireproof layer on the surface of the insulation bag 300 to effectively block the transfer of heat.

[0065] The battery pack 1000 according to the embodiment of the present invention will be described below with reference to the accompanying drawings.

[0066] A battery pack 1000 according to an embodiment of the present invention, combined with Figure 2 and Figure 3 As shown, the box body 100 includes a box body 100 and a battery module 200 . A cavity 110 is provided in the box body 100 , and the battery module 200 is provided in the cavity 110 .

[0067] like Figure 2 As shown, the battery module 200 includes a foam 210 and a plurality of battery cells 220 , and foam 210 is disposed between adjacent battery cells 220 .

[0068] Combination Figure 2 and Figure 3 As shown, the battery module 200 is covered with an insulating bag 300, and the positive and negative electrodes of the battery module 200 extend out of the insulating bag 300. In other words, the positive and negative electrodes of the battery module 200 extend out of the insulating bag 300.

[0069] It can be seen from the above structure that the battery pack 1000 of the embodiment of the present invention, by setting the cavity 110 in the box body 100, the cavity 110 provides an avoidance space for the arrangement of the battery module 200, so as to ensure that the battery module 200 can be assembled inside the box body 100. The battery module 200 is assembled in the cavity 110. On the one hand, the cavity 110 can protect the battery module 200. When the battery pack 1000 is impacted, the cavity 110 collapses to absorb energy, and the box body 100 absorbs part of the impact force by its own strength and rigidity, thereby reducing the damage to the battery module 200 caused by the impact force. On the other hand, the cavity 110 provides an installation space for the battery module 200 and limits the maximum movement position of the battery module 200, so as to prevent the battery module 200 from being dislocated and moved to other parts of the battery pack 1000 when the battery pack 1000 is impacted, thereby improving the position stability of the battery module 200.

[0070] By providing foam 210 between adjacent battery cells 220, during the assembly of the battery module 200, the foam 210 can play a buffering role to ensure that there is no collision between adjacent battery cells 220, thereby extending the life of the battery cells 220. The foam 210 can provide a fixed pre-tightening force in the initial assembly of multiple battery cells 220, and can also absorb the expansion force generated by the battery cells 220 in the later stage of the use of the battery module 200.

[0071] During the assembly of the battery module 200 and the case 100, the foam 210 can be used to reduce the volume of the battery module 200, so as to facilitate the insertion of the battery module 200 into the cavity 110 formed by the case 100, thereby improving the assembly efficiency between the battery module 200 and the case 100 and reducing the difficulty of assembly; when the assembly of the battery module 200 and the case 100 is completed, the foam 210 can also be used to restore the battery module 200 to its original volume, so that the battery module 200 can be abutted against the inner wall of the case 100. The side wall of the case 100 can give the battery module 200 a good pre-tightening force, so that the position of the battery module 200 is stable, and zero-gap assembly is achieved, thereby improving the volume utilization of the battery pack 1000.

[0072] The insulating bag 300 is placed outside the battery module 200 . When the battery pack 1000 moves or is hit, two adjacent battery modules 200 will not contact each other to cause an internal short circuit, thereby extending the service life of the battery module 200 and improving the safety of the battery module 200 .

[0073] The positive and negative electrodes of the battery modules 200 are extended to the outside of the insulation bag 300 , and the battery modules 200 in the battery pack 1000 can be connected through the positive and negative electrodes to form the battery pack 1000 .

[0074] Optionally, the battery cell 220 and the foam 210 may be bonded with a structural adhesive to define the position between the battery cell 220 and the foam 210 and improve the structural stability of the battery module 200 .

[0075] In some embodiments of the present invention, Figure 3 As shown, a plurality of sequentially arranged cavities 110 are provided in the box 100, and a battery module 200 covered with an insulating bag 300 is provided in each cavity 110. In other words, a plurality of battery modules 200 are provided in the box 100 of the present application, and a plurality of cavities 110 separate the plurality of battery modules 200, so as to ensure that two adjacent battery modules 200 will not come into contact during the operation of the battery pack 1000, thereby improving the safety of the battery module 200, and an insulating bag 300 is also provided on the outside of the battery module 200, which further increases the safety of the battery module 200, and the present application can meet the vehicle's demand for large-capacity, high-voltage batteries and improve the vehicle's cruising range by providing a plurality of battery modules 200 in the battery pack 1000.

[0076] In some embodiments of the present invention, the insulating bag 300 is clamped between the inner wall of the cavity 110 and the battery module 200. That is, when the battery module 200 is inserted into the cavity 110, the insulating bag 300 wrapped around the outside of the battery module 200 will not be removed, which reduces the difficulty of assembling the battery pack 1000 on the one hand; on the other hand, the insulating bag 300 wrapped around the outside of the battery module 200 can also play an insulating role, thereby improving the safety of the battery module 200.

[0077] Next, a vehicle according to an embodiment of the present invention will be described.

[0078] A vehicle according to an embodiment of the present invention includes the aforementioned battery pack 1000 .

[0079] It can be seen from the above structure that the vehicle of the embodiment of the present invention, by adopting the aforementioned battery pack 1000, the battery pack 1000 will not occupy too much space at the bottom of the vehicle, and can achieve lightweight of the vehicle, thereby improving the driving experience and the vehicle's cruising range.

[0080] The specific structure of the battery pack 1000 in a specific embodiment of the present invention is described below in conjunction with the accompanying drawings. The embodiments of the present invention may be all embodiments after combining the above-mentioned multiple technical solutions, but are not limited to the following specific embodiments, which all fall within the protection scope of the present invention.

[0081] Example 1

[0082] A battery pack 1000, combined with Figure 2 and Figure 3As shown, the box body 100 includes a box body 100 and a battery module 200 . A cavity 110 is provided in the box body 100 , and the battery module 200 is provided in the cavity 110 .

[0083] like Figure 2 As shown, the battery module 200 includes a foam 210 and a plurality of battery cells 220 , and foam 210 is disposed between adjacent battery cells 220 .

[0084] Combination Figure 2 and Figure 3 As shown, the battery module 200 is covered with an insulating bag 300. When assembling the battery pack 1000, the battery module 200 is loaded into the insulating bag 300, and the insulating bag 300 is evacuated so that the foam 210 is compressed to reduce the volume of the battery module 200. After the battery module 200 with reduced volume is inserted into the cavity 110, the vacuum state is released, and the positive and negative electrodes of the battery module 200 extend out of the insulating bag 300.

[0085] Example 2

[0086] A battery pack 1000, based on Example 1, is provided with a handle position 320 on the insulation bag 300, and a to-be-torn portion 310 is provided on the insulation bag 300, and the to-be-torn portion 310 is formed in a ring shape. The to-be-torn portion 310 is damaged by pulling the handle position 320, and the damage releases the vacuum state of the insulation bag 300.

[0087] The to-be-torn portion 310 is broken to remove a portion of the insulation bag 300 to expose the positive and negative electrodes of the battery module 200 .

[0088] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" 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 mechanical connection or an electrical connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0089] The assembly method of the battery pack 1000 according to the embodiment of the present invention, the battery pack 1000 and other components of the vehicle, such as the principle of evacuating the insulation bag 300, are all known to those skilled in the art and will not be described in detail here.

[0090] In the description of this specification, the description with reference to the terms "embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0091] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A method for assembling a battery pack, characterized in that: The battery pack comprises a box body and a battery module, wherein the box body is provided with a cavity, the battery module comprises foam and a plurality of battery cells, and the foam is provided between adjacent battery cells, and the assembly method comprises the following steps: Putting the battery module into an insulating bag; The insulating bag is evacuated so that the foam is compressed to reduce the volume of the battery module; After the reduced-volume battery module is inserted into the cavity, a handle is provided on the insulation bag, and a portion to be torn is provided on the insulation bag, wherein the portion to be torn is formed in a ring shape, and the portion to be torn is damaged by pulling the handle, and the damage releases the vacuum state of the insulation bag, exposing the positive and negative poles of the battery module.

2. The method for assembling a battery pack according to claim 1, characterized in that: The insulation bag is coated with a fireproof layer.

3. A battery pack, characterized in that: include: A box body, wherein a cavity is provided in the box body; A battery module, the battery module is arranged in the cavity, the battery module comprises foam and a plurality of battery cells, the foam is arranged between adjacent battery cells, the battery module is covered with an insulating bag, and the positive and negative electrodes of the battery module extend out of the insulating bag; The insulating bag is provided with a handle, and a portion to be torn is provided on the insulating bag, and the portion to be torn is formed in a ring shape. The portion to be torn is damaged by pulling the handle, and the vacuum state of the insulating bag is released by the damage. The positive and negative poles of the battery module are exposed.

4. The battery pack according to claim 3, characterized in that: The box body is provided with a plurality of cavities arranged in sequence, and each of the cavities is provided with the battery module covered with an insulating bag.

5. The battery pack according to claim 3, characterized in that: The insulation bag is clamped between the inner wall of the cavity and the battery module.

6. A vehicle, characterized in that: Comprising a battery pack according to any one of claims 3-5.

Images