Battery pack assembly method, battery pack and vehicle

Abstract

The present invention discloses a battery pack assembly method, a battery pack and a vehicle. The battery pack includes a box and a battery module. The box is provided with a cavity. The battery module includes foam and a plurality of battery cells. Foam is provided between adjacent battery cells. The assembly method includes the following steps: an insulating lubricant is coated on the inner circumferential wall of the cavity and / or the outer circumferential wall of the battery module, and the battery module is inserted into the cavity. In the battery pack assembly method of the embodiment of the present invention, a lubricant is first coated on the inner circumferential wall of the cavity and / or the outer circumferential wall of the battery module before assembling the battery module in the cavity. The lubricant can play a lubricating effect. During the assembly process of the battery module and the box, the friction between the battery module and the box is reduced, thereby reducing the assembly difficulty, improving the grouping efficiency of the battery pack, and reducing the assembly gap between the battery module and the box, or even 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 assembly efficiency, the box cannot give the battery module a good pre-tightening force, 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, an assembly method of a battery pack comprises a case and a battery module, wherein the case 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. The assembly method comprises the following steps: coating an inner circumferential wall of the cavity and / or an outer circumferential wall of the battery module with an insulating lubricant; and inserting the battery module into the cavity.

[0009] According to the assembly method of the battery pack of an embodiment of the present invention, a lubricant is first applied to the inner circumferential wall of the cavity and / or the outer circumferential wall of the battery module before the battery module is assembled in the cavity. The lubricant can have a lubricating effect. During the assembly of the battery module and the case, the friction between the battery module and the case is reduced, thereby reducing the difficulty of assembly, improving the grouping efficiency of the battery pack, reducing the assembly gap between the battery module and the case, or even achieving zero gap assembly, ensuring that the case can continuously apply a pre-tightening force to the battery module, and through the above-mentioned setting, the size of the case can be designed to be comparable to the size of the battery module, thereby reducing the volume of the case, and then reducing the volume of the battery pack, thereby improving practicality.

[0010] According to the battery pack assembly method of one embodiment of the present invention, a volatile material is provided in the lubricant, and after the battery module is inserted into the cavity, the lubricant volatilizes.

[0011] According to a battery pack assembly method according to an embodiment of the present invention, an insulating layer is wrapped around the battery module, and the lubricant is coated on the insulating layer.

[0012] According to the battery pack assembly method according to one embodiment of the present invention, the lubricant is silicone oil.

[0013] According to an embodiment of the present invention, the assembly method of a battery pack further includes the following steps before the lubricant is coated on the inner wall of the cavity: 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 the battery module is inserted into the cavity, releasing the vacuum state to expose the positive and negative electrodes of the battery module.

[0014] Optionally, a portion to be torn is provided on the insulation bag, so that the portion to be torn is damaged to release the vacuum state.

[0015] Optionally, the insulation bag is coated with a fireproof layer.

[0016] A battery pack according to an embodiment of the present invention includes: a box body, a cavity is provided in the box body; a battery module, the battery module is arranged in the cavity, a lubricant is provided between the cavity and the outer peripheral wall of the battery module, the battery module includes foam and a plurality of battery cells, and the foam is provided between adjacent battery cells.

[0017] According to the battery pack of the embodiment of the present invention, by arranging the battery module in the cavity formed by the box body, the box body can protect the battery module, prolong the service life of the battery module and improve the safety of the battery module, and a lubricant is provided between the cavity and the outer peripheral wall of the battery module. During the process of inserting the battery module into the cavity, the lubricant can reduce the friction between the battery module and the box body, and improve the battery pack assembly efficiency while ensuring that the box body can continuously apply pre-tightening force to the battery module. The battery pack of the present application is simple to assemble, small in size and light in weight.

[0018] According to a battery pack of an embodiment of the present invention, the battery module is wrapped with an insulating layer, and the lubricant is provided between the insulating layer and the inner circumferential wall of the cavity.

[0019] A vehicle according to an embodiment of the present invention includes the aforementioned battery pack.

[0020] 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, thereby improving the vehicle's cruising range and driving experience.

[0021] 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

[0022] 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:

[0023] Figure 1 The figure is a flow chart of a method for assembling a battery pack according to an embodiment of the present invention.

[0024] Figure 2 The figure is a flow chart of a method for assembling a battery pack according to another embodiment of the present invention.

[0025] Figure 3 An exploded view of a battery module and an insulation bag according to an embodiment of the present invention.

[0026] Figure 4 FIG. 1 is a schematic structural diagram of a battery pack according to an embodiment of the present invention.

[0027] Figure 5 for Figure 4 A partial enlarged view of area Ⅰ in the middle.

[0028] Reference numerals:

[0029] 1000, battery pack;

[0030] 100, box body; 110, cavity;

[0031] 200, battery module; 210, foam; 220, battery cell;

[0032] 300. Insulation bag; 310. Place to be torn; 320. Handle position. DETAILED DESCRIPTION

[0033] 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.

[0034] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by the terms "upper", "lower", "front", "rear", "top", "bottom", "inside", "outside", "circumferential", etc. 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, 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.

[0035] 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.

[0036] According to an embodiment of the present invention, a battery pack 1000 assembly method is combined with Figure 3 and Figure 4 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 .

[0037] like Figure 3 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 .

[0038] like Figure 1 As shown, the assembly method of the battery pack 1000 includes the following steps:

[0039] Step S1: An insulating lubricant is coated on the inner circumferential wall of the cavity 110 and / or the outer circumferential wall of the battery module 200. Here, it means that the insulating lubricant can be coated on one of the inner circumferential wall of the cavity 110 or the outer circumferential wall of the battery module 200, or the insulating lubricant can be coated on both the inner circumferential wall of the cavity 110 and the outer circumferential wall of the battery module 200.

[0040] Step S2 : inserting the battery module 200 into the cavity 110 .

[0041] 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 to first coat the inner wall of the cavity 110 and / or the outer wall of the battery module 200 with an insulating lubricant before assembling the battery module 200 in the cavity 110. The lubricant can have a lubricating effect. During the assembly of the battery module 200 and the case 100, the friction between the battery module 200 and the case 100 is reduced, thereby reducing the difficulty of assembly, improving the grouping efficiency of the battery pack 1000, and further reducing the assembly gap between the battery module 200 and the case 100 or even achieving zero gap assembly. The above setting can also reduce the wear between the battery module 200 and the case 100, thereby extending the service life of the battery module 200 and the case 100.

[0042] 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 100, the size of the box 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 100 without deliberately producing a larger box 100. While reducing the difficulty of assembly, the volume of the box 100 can also be reduced. On the first hand, the material used for the box 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, thereby achieving lightweight battery pack 1000 and improving the cruising range of the battery pack 1000.

[0043] After the battery module 200 is inserted into the cavity 110 , the battery module 200 can abut against the inside of the box 100 , and the side wall of the box 100 can give the battery module 200 a good pre-tightening force, so that the position of the battery module 200 is stable.

[0044] Because the lubricant coated on the inner wall of the cavity 110 and / or the outer wall of the battery module 200 of the present application is insulating, the lubricant has a good insulating effect, ensuring that when the battery pack 1000 is moving or collided, 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.

[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 a 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 a 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] Optionally, when an insulating lubricant is coated on the inner wall of the cavity 110, the lubricant covers the entire inner wall of the cavity 110, that is, the entire inner wall of the cavity 110 is coated with the lubricant to reduce the friction between the battery module 200 and the cavity 110 during the insertion of the battery module 200, thereby facilitating the rapid insertion of the battery module 200.

[0047] Optionally, when the insulating lubricant is applied to the outer peripheral wall of the battery module 200, the lubricant covers the entire outer peripheral wall of the battery module 200. The beneficial effects produced can refer to the beneficial effects produced when the lubricant covers the entire inner peripheral wall of the cavity 110, which will not be described in detail here.

[0048] Advantageously, an insulating lubricant is applied to the entire inner circumferential wall of the cavity 110 and the entire outer circumferential wall of the battery module 200. This minimizes the friction between the outer circumferential wall of the battery module 200 and the inner circumferential wall of the cavity 110, improves the assembly efficiency of the battery pack 1000, and does not cause wear to the box 100 and the battery module 200 during the assembly process.

[0049] In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0050] In some embodiments of the present invention, a volatile material is provided in the lubricant, and the lubricant evaporates after the battery module 200 is inserted into the cavity 110. Since the lubricant itself has a certain weight, coating the lubricant on the inner circumferential wall of the cavity 110 and / or the outer circumferential wall of the battery module 200 will increase the weight of the battery pack 1000. Therefore, by providing a lubricant containing a volatile material, when the battery module 200 and the box 100 are assembled using the lubricant, the lubricant automatically evaporates, does not increase the weight of the battery pack 1000, and achieves lightweight battery pack 1000. Setting the battery pack 1000 on a vehicle can effectively increase the vehicle's cruising range.

[0051] In some embodiments of the present invention, an insulating layer is wrapped around the battery module 200, and a lubricant is coated on the insulating layer. Wrapping the insulating layer around the outside of the battery module 200 can, on the one hand, ensure that the outer surface of the battery module 200 is smooth, making it easier to coat the lubricant, and the lubricant will not flow into the inside of the battery module 200; on the other hand, the insulating layer can effectively prevent adjacent battery modules 200 from contacting each other and causing an internal short circuit, thereby improving the safety of the battery module 200.

[0052] In some embodiments of the present invention, Figure 2 As shown, the lubricant is silicone oil. Silicone oil has good insulation and chemical stability, and can reduce the friction between the battery module 200 and the box 100 while improving the insulation performance of the battery module 200.

[0053] In some embodiments of the present invention, Figure 2 As shown, before the lubricant is coated on the inner wall of the cavity 110, the following steps are also included:

[0054] Step S01 : putting the battery module 200 into the insulation bag 300 .

[0055] Step S02 : evacuating the insulation bag 300 so that the foam 210 is compressed to reduce the volume of the battery module 200 .

[0056] Because the foam 210 is arranged between adjacent battery cells 220, the foam 210 will be deformed under the action of external force, and can restore its 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 and the gap between the adjacent battery cells 220 are compressed by evacuating the insulation bag 300 to reduce the foam 210. 0, thereby reducing the distance between adjacent battery cells 220, so that the overall size of the battery module 200 is reduced; in the subsequent assembly process of the battery pack 1000, the smaller battery module 200 and the lubricant coated on the inner wall of the cavity 110 cooperate to ensure that the battery module 200 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 extending the service life of the battery module 200 and the box body 100.

[0057] Of course, in some other examples, the battery module 200 may be placed in the insulation bag 300 and the insulation bag 300 may be evacuated before the lubricant is applied to the outer wall of the battery module 200. That is, after the insulation bag 300 is evacuated, the lubricant is applied to the outer wall of the battery module 200, as long as the lubricant can cover the outer wall of the battery module 200.

[0058] Alternatively, if Figure 2 As shown, after the battery module 200 is inserted into the cavity 110, the following steps are also included:

[0059] Step S3: After the battery module 200 is inserted into the cavity 110 , the vacuum state is released, and the positive and negative electrodes of the battery module 200 are exposed.

[0060] When the vacuum state of the insulating bag 300 is released, 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. When the battery module 200 abuts against the inside of the box 100, the side wall of the box 100 can give the battery module 200 a good pre-tightening force, so that the position of the battery module 200 is stable.

[0061] When the vacuum state is released, the positive and negative electrodes of the battery module 200 are exposed, which facilitates the connection of the battery module 200 with the positive and negative electrodes of the adjacent battery module 200 to form the battery pack 1000 .

[0062] 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.

[0063] Optionally, 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.

[0064] Alternatively, if Figure 3 and Figure 4 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.

[0065] 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.

[0066] 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.

[0067] Alternatively, if Figure 5 As 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.

[0068] Optionally, 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.

[0069] 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.

[0070] The battery pack 1000 according to the embodiment of the present invention will be described below with reference to the accompanying drawings.

[0071] A battery pack 1000 according to an embodiment of the present invention, combined with Figure 3 and Figure 4 As shown, it includes a box body 100 and a battery module 200 , a cavity 110 is provided in the box body 100 , the battery module 200 is provided in the cavity 110 , and a lubricant is provided between the cavity 110 and the outer peripheral wall of the battery module 200 .

[0072] 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 .

[0073] 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.

[0074] A lubricant is arranged between the cavity 110 and the outer peripheral wall of the battery module 200. During the assembly process of the battery module 200 and the case 100, the lubricant can play a lubricating effect, reduce the friction between the battery module 200 and the case 100, thereby reducing the difficulty of assembly, improving the grouping efficiency of the battery pack 1000, and further reducing the assembly gap between the battery module 200 and the case 100, or even achieving zero gap assembly. The above arrangement can also reduce the wear between the battery module 200 and the case 100, thereby extending the service life of the battery module 200 and the case 100.

[0075] 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.

[0076] 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.

[0077] In some embodiments of the present invention, the battery module 200 is wrapped with an insulating layer, and a lubricant is provided between the insulating layer and the inner circumferential wall of the cavity 110. That is, the lubricant is coated on the insulating layer or on the inner circumferential wall of the cavity 110, so that a lubricant is formed between the insulating layer and the inner circumferential wall of the cavity 110, which is convenient for assembling the battery module 200 and the box 100, and the insulating layer can ensure that the outer surface of the battery module 200 is smooth, which is convenient for coating the lubricant, and the lubricant will not flow into the interior of the battery module 200; the insulating layer can also effectively prevent adjacent battery modules 200 from contacting each other and causing internal short circuits, thereby improving the safety of the battery module 200.

[0078] Next, a vehicle according to an embodiment of the present invention will be described.

[0079] A vehicle according to an embodiment of the present invention includes the aforementioned battery pack 1000 .

[0080] 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.

[0081] 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.

[0082] Example 1

[0083] A battery pack 1000, combined with Figure 3 and Figure 4 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 .

[0084] like Figure 3As 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 .

[0085] A method for assembling a battery pack 1000, including the battery pack 1000 in Embodiment 1, comprises the following steps:

[0086] Step S1 : an insulating lubricant is applied to the inner peripheral wall of the cavity 110 and the outer peripheral wall of the battery module 200 .

[0087] Step S2 : inserting the battery module 200 into the cavity 110 .

[0088] Example 2

[0089] A battery pack 1000, combined with Figure 3 and Figure 4 As shown, the battery pack 1000 includes a box body 100 , a battery module 200 and an insulation bag 300 , and a cavity 110 is defined in the box body 100 .

[0090] like Figure 3 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 .

[0091] A method for assembling a battery pack 1000, including the battery pack 1000 in Embodiment 2, comprises the following steps:

[0092] Step S01 : putting the battery module 200 into the insulation bag 300 .

[0093] Step S02 : evacuating the insulation bag 300 so that the foam 210 is compressed to reduce the volume of the battery module 200 .

[0094] Step S1: an insulating lubricant is applied to the inner peripheral wall of the cavity 110 .

[0095] Step S2 : inserting the battery module 200 into the cavity 110 .

[0096] Step S3: The vacuum state of the insulation bag 300 is released, and the positive and negative electrodes of the battery module 200 are exposed.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] 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; An insulating lubricant is coated on the inner peripheral wall of the cavity and / or the lubricant is coated on the insulating bag; inserting the battery module into the cavity; After the battery module is inserted into the cavity, releasing the vacuum state; Wherein, the insulation bag is coated with a fireproof layer.

2. The method for assembling a battery pack according to claim 1, characterized in that: The lubricant is provided with a volatile material, and after the battery module is inserted into the cavity, the lubricant volatilizes.

3. The method for assembling a battery pack according to claim 1, characterized in that: The lubricant is silicone oil.

4. The method for assembling a battery pack according to claim 1, characterized in that: After the lubricant is applied to the inner wall of the cavity, the following steps are also included: The positive and negative electrodes of the battery module are exposed.

5. The method for assembling a battery pack according to claim 4, characterized in that: The insulating bag is provided with a portion to be torn, so that the portion to be torn is broken to release the vacuum state.

6. A battery pack, characterized in that: include: A box body, wherein a cavity is provided in the box body; A battery module, wherein the battery module is arranged in the cavity, a lubricant is arranged between the cavity and the outer peripheral wall of the battery module, the battery module comprises foam and a plurality of battery cells, and the foam is arranged between adjacent battery cells; The battery module is wrapped with an insulation bag, and the lubricant is provided between the insulation bag and the inner peripheral wall of the cavity; The battery module is loaded into the insulating bag; the insulating bag is evacuated so that the foam is compressed to reduce the volume of the battery module; an insulating lubricant is coated on the inner wall of the cavity and / or the lubricant is coated on the insulating bag; the battery module is inserted into the cavity; after the battery module is inserted into the cavity, the vacuum state is released; the insulating bag is coated with a fireproof layer.

7. A vehicle, characterized in that: Comprising the battery pack according to claim 6.

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