CN219873805U

CN219873805U - Lower inner shell, lower shell, battery box and battery pack of battery pack

Info

Publication number: CN219873805U
Application number: CN202223605674.3U
Authority: CN
Inventors: ***; 于新瑞; 张小春; 徐小委
Original assignee: Aulton New Energy Automotive Technology Co Ltd
Current assignee: Aulton New Energy Automotive Technology Co Ltd
Priority date: 2022-06-02
Filing date: 2022-12-30
Publication date: 2023-10-20
Anticipated expiration: 2032-12-30
Also published as: CN116666854A; CN219843065U; CN220914425U; CN117175112A; CN219106356U; CN219779058U; CN117175111A; CN117175106A

Abstract

The utility model discloses a lower inner shell of a battery pack, a lower shell, a battery box and the battery pack, wherein the lower inner shell of the battery pack is made of a nonmetallic composite material, the lower inner shell comprises a lower inner shell body, an inner shell step which contracts inwards is arranged at the bottom edge of the lower inner shell body, and the inner shell step is used for supporting a battery module placed in the lower inner shell body. Therefore, the inner shell step can increase the bottom strength of the lower inner shell body, increase the rigidity, prevent the lower inner shell body from being distorted and deformed, and has lower cost, easy realization and obvious effect; moreover, when guaranteeing the intensity of inner shell body down, the thickness of inner shell body bottom under the setting of inner shell step can effectively attenuate, lightens the weight of inner shell body down, can also save the materials of inner shell body down.

Description

Lower inner shell, lower shell, battery box and battery pack of battery pack

Technical Field

The utility model relates to the technical field of new energy vehicle battery packs, in particular to a lower inner shell, a lower shell, a battery box and a battery pack of the battery pack.

Background

In order to reduce excessive dependence on oil and gas resources and reduce environmental pollution, new energy vehicles are rapidly developed. The power source of the new energy automobile is generally a battery pack, the lower shell of the battery pack mainly plays a role in bearing and sealing, and the lower shell of the battery pack is mainly used for installing parts such as a battery module, an electric device, an upper shell and the like.

In order to secure the safety of the internal battery module, the electric device, and the like, the lower case of the battery pack needs to have sufficient structural strength. However, the lower shell of the existing battery pack is formed by welding flat plates, so that the structural strength is weak, internal parts cannot be effectively supported and protected, the increasingly improved performance and technical indexes in the field of electric automobiles cannot be met, and there is room for improvement.

Disclosure of Invention

In order to solve the technical problem that the lower shell of the existing battery pack is weak in structural strength, the first aim of the utility model is to provide a lower inner shell of the battery pack, an inner shell step is arranged on the inner side of an inner shell body, the inner shell step can increase the bottom strength of the lower inner shell body, the rigidity is increased, the lower inner shell body is prevented from being distorted and deformed, the cost is lower, the realization is easy, and the effect is obvious; moreover, when guaranteeing the intensity of inner shell body down, the thickness of inner shell body bottom under the setting of inner shell step can effectively attenuate, lightens the weight of inner shell body down, can also save the materials of inner shell body down.

A second object of the present utility model is to provide a lower case of a battery pack, which employs the lower inner case of the battery pack.

A third object of the present utility model is to provide a battery case that employs the lower case of the battery pack described above.

A fourth object of the present utility model is to provide a battery pack employing the above battery case or the above battery pack lower case.

The utility model discloses a lower inner shell of a battery pack, which adopts the following technical scheme:

the utility model provides a lower inner shell of battery package, its adopts non-metal composite to make, lower inner shell includes down the inner shell body, the bottom edge of lower inner shell body is equipped with the inner shell step of inside shrink, the inner shell step is used for supporting and puts into the battery module in the lower inner shell body.

Therefore, the inner shell step can increase the bottom strength of the lower inner shell body, increase the rigidity, prevent the lower inner shell body from being distorted and deformed, and has lower cost, easy realization and obvious effect; moreover, when guaranteeing the intensity of inner shell body down, the thickness of inner shell body bottom under the setting of inner shell step can effectively attenuate, lightens the weight of inner shell body down, can also save the materials of inner shell body down.

As an alternative implementation manner of the lower inner case of the battery pack, the battery module includes a plurality of battery cells and end plates disposed at opposite sides of the plurality of battery cells, and the inner case steps are used for supporting the end plates of the battery module.

Therefore, the inner shell step can support and position the end plate of the battery module, so that the end plate of the battery module is more stable.

As an alternative implementation manner of the lower inner case of the battery pack, the upper surface of the inner case step is provided with a screw hole extending downward, and the screw hole is used for fixing the end plate of the battery module.

Therefore, the threaded holes can be used for fixing and positioning the end plates of the battery module, so that the end plate structure is more stable.

As an alternative implementation of the lower inner case of the battery pack, the screw hole of the inner case step is formed by embedding an insert nut at the time of molding the nonmetallic composite material.

Therefore, the forming process of the threaded hole is simple and convenient, and the cost is low.

As an alternative implementation manner of the lower inner shell of the battery pack, the side surface of the embedded nut is connected with the side wall of the inner shell step.

Therefore, the side wall of the step of the inner shell is utilized to strengthen the embedded tooth socket.

As an alternative implementation manner of the lower inner case of the battery pack, the upper surface of the inner case step is bonded to the battery module.

Therefore, the upper surface of the inner shell step can be bonded with the battery module through glue, and can be bonded with the battery module when the upper surface of the inner shell step is in an unshaped molten state.

As an alternative implementation mode of the lower inner shell of the battery pack, a temperature regulating mechanism is arranged at the bottom of the lower inner shell body in the range of an interval surrounded by the steps of the inner shell, and the upper surface of the temperature regulating mechanism is in contact with the battery module.

Therefore, the weight of the battery module acts on the steps of the inner shell, and the temperature regulating mechanism is located in the range of the interval surrounded by the steps of the inner shell, so that the damage of the temperature regulating mechanism caused by the slope pressing temperature regulating mechanism of the battery module is avoided.

As an alternative implementation manner of the lower inner case of the battery pack, the upper surface of the temperature regulating mechanism is adhered to the battery module; and/or the temperature regulating mechanism is connected with the bottom surface of the lower inner shell body in an adhesive manner; and/or, the temperature regulating mechanism is in interference fit with the step of the inner shell.

As an alternative implementation of the lower inner case of the battery pack, the temperature regulating mechanism includes a liquid cooling tube or a liquid cooling plate.

Therefore, the cooling efficiency is high, the cooling of the battery module is facilitated, and the performance of the battery module is improved.

As an alternative implementation of the lower inner case of the battery pack, the lower inner case further includes an inner reinforcing structure disposed inside the lower inner case body.

Therefore, the overall strength of the lower inner shell can be improved through the inner reinforcing structure.

As an alternative implementation manner of the lower inner case of the battery pack, the inner reinforcement structure includes reinforcement plates connected with both inner surfaces of the lower inner case body along both ends of the width direction of the lower inner case body.

Therefore, the reinforcing plate is connected with the inner surfaces of the two sides of the lower inner shell body, so that the overall strength of the lower inner shell is improved.

As an alternative implementation manner of the lower inner shell of the battery pack, the inner side of the lower inner shell body is provided with a preset inner shell clamping groove, and the reinforcing plate is fixed through the inner shell clamping groove; or, the inner reinforcing structure is connected with the lower inner shell in an adhesive manner.

Therefore, the inner shell clamping groove is used for positioning the reinforcing plate, and the reinforcing plate is convenient to fix the inner shell body when in a pre-positioning mode. The reinforcing plate is detachably connected with the lower inner shell body.

As an alternative implementation manner of the lower inner shell of the battery pack, the reinforcing plate is made of metal;

or the reinforcing plate is made of the same material as the lower inner shell body.

Therefore, the metal has strong heat conduction capability and high strength, and when the reinforcing plate is made of metal, the heat can be dissipated more quickly, and better strength can be realized. When the reinforcing 5 plate and the lower inner shell body are made of the same material, the materials of the lower inner shell body and the reinforcing plate can be mutually used, the reinforcing plate can be made of the residual materials of the lower inner shell body, and the structural part of the lower inner shell body can be made of the residual materials of the reinforcing plate.

As an alternative implementation manner of the lower inner shell of the battery pack, the lower end of the reinforcing plate is abutted against the upper end of the lower inner shell

The reinforcing plate is arranged on an inner shell step at the bottom edge of the lower inner shell body, and a drop is arranged between the reinforcing plate and the bottom surface of the lower inner shell body 0 and is used for installing a temperature regulating mechanism.

Therefore, the damage caused by the pressure of the reinforcing plate to the temperature regulating mechanism is avoided.

The utility model relates to a lower shell of a battery pack, which adopts the following technical scheme:

a lower shell of a battery pack, which comprises a lower outer shell and a lower inner shell of any battery pack, wherein the lower outer shell and the lower inner shell are sleeved with each other, and the lower outer shell is made of a nonmetallic composite material.

5 as an alternative implementation of the lower casing of the battery pack, the bottom edge of the lower casing being provided with a sealing surface

The bottom of the lower inner shell body is provided with an inner shell step which is matched with the inner shell step and is contracted inwards, and the bottom of the lower outer shell is provided with a groove matched with the protrusion of the upper cover by utilizing the outer shell step.

Therefore, on one hand, the structural strength of the lower shell is improved, and the structural strength of the whole lower shell is further improved;

on the other hand, the thickness of the lower shell can be reduced while the structural strength of the lower shell is ensured, so that the weight of the lower shell of 0 is further reduced; thirdly, the lower inner shell and the lower outer shell are matched for limiting, so that the stability is facilitated

The lower inner shell is matched with the lower outer shell, so that the stability of the whole structure of the lower shell is improved; fourth, the lower shell of one battery pack can be matched with the upper cover of another battery pack, so that the positioning of a plurality of battery boxes when the battery boxes are stacked is facilitated, and the stacking of the battery boxes is enabled to be more stable. Fifth, the structure of the inner and outer shells is easier to play a role in heat preservation.

As an alternative implementation manner of the lower shell of the battery pack, the lower inner shell further comprises a lower shell side wall reinforcing structure arranged outside the edge of the 5 lower inner shell body, and the edge of the lower outer shell is opposite to the lower shell side

The wall reinforcing structures are connected.

Therefore, the structural strength of the lower inner shell is further increased, and the stability of the fit between the lower inner shell and the lower outer shell is improved.

As an alternative implementation manner of the lower shell of the battery pack, a lower shell gap is arranged between the lower outer shell and the lower inner shell, and the lower shell gap is filled with a heat insulation layer.

Therefore, the fireproof and heat-insulating performance of the battery pack lower shell is improved.

The utility model discloses a battery box, which adopts the following technical scheme:

a battery box comprising an upper cover and any one of the lower cases described above.

The battery pack adopts the following technical scheme:

a battery pack comprising a battery compartment as described above, or any of the lower cases as described above.

The utility model has the beneficial effects that:

the inner shell step is arranged on the inner side of the inner shell body of the battery pack, the inner shell step can increase the bottom strength of the lower inner shell body, the rigidity is increased, the lower inner shell body is prevented from being distorted and deformed, the cost is low, the implementation is easy, and the effect is obvious; moreover, when guaranteeing the intensity of inner shell body down, the thickness of inner shell body bottom under the setting of inner shell step can effectively attenuate, lightens the weight of inner shell body down, can also save the materials of inner shell body down.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model and do not constitute a limitation on the utility model. In the drawings:

fig. 1 is a schematic perspective view of a battery box in an exemplary embodiment of the present utility model;

fig. 2 is a schematic side view of a battery case according to an exemplary embodiment of the present utility model;

FIG. 3 is a schematic cross-sectional view of the structure at E-E in FIG. 2;

fig. 4 is a schematic perspective view of a battery box in an exemplary embodiment of the present utility model;

fig. 5 is a schematic perspective view illustrating a battery case in which an upper cover is omitted in an exemplary embodiment of the present utility model.

FIG. 6 is a schematic perspective view of a lower shell in an exemplary embodiment of the utility model;

FIG. 7 is a schematic perspective view of a lower inner shell in an exemplary embodiment of the present utility model;

FIG. 8 is a partial perspective view of the lower inner shell in an exemplary embodiment of the present utility model;

FIG. 9 is a partial perspective view of the lower inner shell in an exemplary embodiment of the present utility model;

FIG. 10 is a schematic perspective view of a lower housing in accordance with another exemplary embodiment of the present utility model;

FIG. 11 is a partial perspective view of a lower housing in accordance with another exemplary embodiment of the present utility model;

fig. 12 is a partial perspective view of the exterior of the lower housing in another exemplary embodiment of the present utility model.

Reference numerals illustrate:

a. a battery box;

1. an upper cover; 11. a protrusion;

2. a lower case; 21. a lower housing; 211. a housing step; 22. a lower inner case; 221. an inner shell step; 222. the edge of the lower inner shell body; 223. a reinforcing plate; 224. an inner housing clamping groove; 225. sealing grooves; 23. a lower shell gap; 24. a lower shell side wall reinforcing structure;

3. a seal ring;

4. end plates.

Detailed Description

For a clearer understanding of the technical features, objects and effects of the present utility model, embodiments of the present utility model will now be described with reference to the drawings, in which like reference numerals refer to identical or structurally similar but functionally identical components throughout the separate views.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, however, the present utility model may be practiced in other ways than those described herein, and therefore the scope of the present utility model is not limited to the specific embodiments disclosed below.

The first embodiment is as follows:

referring to fig. 1 to 4, a battery case a of a battery pack includes an upper cover 1 and a lower case 2, a sealing ring 3 is provided between the upper cover 1 and the lower case 2, and a battery module, a temperature regulating mechanism, and other parts may be carried inside the lower case 2. Specifically, the lower shell 2 includes a lower outer shell 21 and a lower inner shell 22 that are sleeved with each other, a lower shell gap 23 is provided between the lower outer shell 21 and the lower inner shell 22, and a heat-insulating layer is filled in the lower shell gap 23 to improve the fireproof and heat-insulating properties of the lower shell 2.

In a specific embodiment, the insulation layer in the lower shell gap 23 may include an aerogel layer and a foaming material layer. In other embodiments, the insulating layer may include only an aerogel layer, or only a foam layer, or may be other forms of insulating material.

In one embodiment, the lower outer shell 21 and the lower inner shell 22 are both made of a non-metallic composite material. The nonmetallic composite material comprises a fiber reinforced resin matrix composite material, preferably the fiber reinforced resin matrix composite material comprises a glass fiber reinforced resin matrix composite material and/or a carbon fiber reinforced resin matrix composite material and/or a resin fiber reinforced resin matrix composite material and/or a ceramic fiber reinforced resin matrix composite material, more preferably the glass fiber reinforced resin matrix composite material, even more preferably SMC (Sheet molding compound), namely the glass fiber reinforced resin matrix composite material, SMC (Sheet molding compound), also called sheet molding compound, is a glass fiber reinforced resin matrix composite material, and the main raw materials comprise SMC special yarns, unsaturated resin, low shrinkage additives, fillers and various auxiliary agents. The metal box is molded by high-temperature one-step compression molding, has the advantages of high mechanical strength, light weight, corrosion resistance, long service life, high insulating strength, arc resistance, flame retardance, good sealing performance, flexible product design, easy mass production, safety and attractive appearance, has all-weather protection function, and overcomes the defects of easy corrosion, short service life, poor heat insulation and heat preservation performance and the like of a metal box body.

In the first embodiment, referring to fig. 5 to 6, the lower inner case 22 includes a lower inner case body, the bottom edge of which is provided with an inner case step 221 that is inwardly contracted, and the inner case step 221 serves to support the battery module placed in the lower inner case body. Referring to fig. 5, the battery module includes a plurality of battery cells and end plates 4 disposed at opposite sides of the battery cells, and an inner case step 221 is used to support the end plates 4 of the battery module. Referring to fig. 10 to 12, the bottom edge of the lower outer case 21 is provided with an inwardly contracted outer case step 211 which is adapted to the inner case step 221 of the bottom edge of the lower inner case body, referring to fig. 1, the upper surface of the upper cover 1 is provided with a protrusion 11, and the bottom of the lower outer case 21 is formed with a groove for matching with the protrusion 11 of the upper cover 1 by using the outer case step 211, so that the bottom of the lower outer case 21 can be matched with the top of the upper cover 1, positioning when a plurality of battery cases a are stacked is facilitated, and stacking of the battery cases a is more stable.

From the top, the bottom strength of the lower inner shell body can be increased by the inner shell step 221, the rigidity is increased, the lower inner shell body is prevented from being distorted and deformed, the cost is lower, the realization is easy, the effect is obvious, the end plate 4 of the battery module can be supported and positioned by the inner shell step 221, and the end plate 4 of the battery module is more stable; the outer shell step 211 can improve the structural strength of the lower outer shell 21, the inner shell step 221 and the outer shell step 211 can doubly improve the overall structural strength of the lower shell 2, and the lower inner shell 22 and the lower outer shell 21 are matched so as to limit, so that the lower inner shell 22 and the lower outer shell 21 are conveniently and stably matched, and the stability of the overall structure of the lower shell 2 is improved; and, in guaranteeing the intensity of lower inner shell body and shell 21 down, the setting of inner shell step 221 and shell step 211 can effectively attenuate the thickness of lower inner shell body bottom and shell 21 bottom down, lightens the weight of inferior valve 2, saves the material of inferior valve 2.

In the first embodiment, the upper surface of the inner case step 221 is provided with a screw hole extending downward, which is used to fix the end plate 4 of the battery module. Therefore, the threaded holes can be used for fixing and positioning the end plate 4 of the battery module, so that the structure of the end plate 4 is more stable.

In other embodiments, the connection between the upper surface of the inner case step 221 and the battery module is not limited to the screw connection, for example, the upper surface of the inner case step 221 is bonded to the battery module, specifically, the upper surface of the inner case step 221 may be bonded to the battery module by glue, or the battery module may be placed on the inner case step 221 when the upper surface of the inner case step 221 is in an unformed molten state, so that the lower surface of the battery module is integrally bonded to the upper surface of the inner case step 221.

In one embodiment, the threaded hole of the inner shell step 221 is formed by embedding an insert nut while the nonmetallic composite material is being molded. Therefore, the forming process of the threaded hole is simple and convenient, and the cost is low.

In a first embodiment, the side surface of the embedded nut is connected to the side wall of the inner case step 221. In this way, the pre-buried socket is reinforced by the sidewall of the inner case step 221.

In the first embodiment, a temperature control mechanism is disposed at the bottom of the lower inner case body within the range of the interval surrounded by the inner case step 221, and the upper surface of the temperature control mechanism contacts with the battery module, and the temperature control mechanism is a liquid cooling pipe or a liquid cooling plate, so as to improve the cooling efficiency. In other embodiments, the temperature regulating mechanism may take other forms.

Therefore, the weight of the battery module acts on the inner shell step 221, and the temperature regulating mechanism is located in the range of the interval surrounded by the inner shell step 221, so that the damage of the temperature regulating mechanism caused by the battery module pressing slope temperature regulating mechanism is avoided.

In a first embodiment, the upper surface of the temperature regulating mechanism is adhered to the battery module; the temperature regulating mechanism can be connected with the bottom surface of the lower inner shell body in an adhesive mode; the temperature regulating mechanism may also be in an interference fit with the inner housing step 221.

Referring to fig. 8 and 9, in a first embodiment, the lower inner case 22 further includes a lower case sidewall reinforcement structure 24 disposed outside the edge 222 of the lower inner case body, and the edge of the lower outer case 21 is connected to the lower case sidewall reinforcement structure 24. Therefore, the structural strength of the lower inner shell 22 is further increased, and the stability of the fit between the lower inner shell 22 and the lower outer shell 21 is improved. The lower shell sidewall reinforcement structure 24 may be a reinforcement bar as shown in fig. 8 or 9.

Referring to fig. 7, the edge 222 of the lower inner case body is further provided with a sealing groove 225 for sealing the lower case gap 23 when being mated with the lower outer case 21.

The second embodiment is as follows:

the second embodiment is based on the first embodiment. Referring to fig. 7, in the second embodiment, the lower inner case 22 further includes an inner reinforcing structure disposed inside the lower inner case body, the inner reinforcing structure including reinforcing plates 223, and both ends of the reinforcing plates 223 in the width direction of the lower inner case body are connected with both side inner surfaces of the lower inner case body. In this way, by connecting the reinforcing plates 223 with both side inner surfaces of the lower inner case body, the overall strength of the lower inner case 22 can be improved.

In other embodiments, the internal reinforcing structure may also take other forms, such as ribs.

Referring to fig. 7, in the second embodiment, the inner side of the lower inner case body has a predetermined inner case catching groove 224, and a reinforcing plate 223 is fixed by the inner case catching groove 224. Therefore, the inner shell clamping groove 224 is provided for positioning the reinforcing plate 223, so that the reinforcing plate 223 is conveniently positioned when being fixed on the lower inner shell body, and the reinforcing plate 223 and the lower inner shell body are detachably connected.

In other embodiments, the connection between the inner reinforcing structure and the lower inner shell body is not limited to the form of a slot, for example, the inner reinforcing structure may be connected to the lower inner shell 22 by gluing, specifically, glue may be used to connect the inner reinforcing structure to the lower inner shell 22, or the inner reinforcing structure may be placed on the lower inner shell 22 when the lower inner shell 22 is in a molten state and not yet molded, so that the inner reinforcing structure and the lower inner shell are glued together.

In the second embodiment, the reinforcing plate 223 is made of metal. The heat conduction capability of the metal is stronger,

accordingly, the reinforcing plate 223 is made of metal, so that heat dissipation can be faster. Specifically, the aluminum alloy is light in weight, has a low melting point of 5, and is recyclable, and therefore, the reinforcement plate 223 may be provided as an aluminum plate.

In other embodiments, the reinforcement plate 223 is made of the same material as the lower inner case body. Therefore, the materials of the lower inner shell body and the reinforcing plate 223 can be mutually used, the reinforcing plate 223 can be made from the residual materials of the lower inner shell body, and the structural member of the lower inner shell body can also be made from the residual materials of the reinforcing plate 223.

0 referring to fig. 7, in the second embodiment, the lower end of the reinforcement plate 223 is abutted against the lower inner case

On the inner shell step 221 of the bottom edge of the body, there is a drop between the reinforcing plate 223 and the bottom surface of the lower inner shell body, and the drop is used for installing the temperature regulating mechanism. In this way, the reinforcing plate 223 can be prevented from being damaged by pressing the temperature control mechanism.

In the second embodiment, the number of the reinforcement plates 223 may be plural, and the plurality of reinforcement plates 223 are disposed at intervals of 5 inside the lower inner case body. In this way, if the length of the lower inner case 22 is too long, resulting in insufficient structural strength, the number of the reinforcing plates 223 may be increased to further reinforce the structurally weak position.

In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments.

In particular, for system embodiments, since they are substantially similar to method embodiments, the comparison 0 described is simple, as relevant to see the section description of method embodiments.

The foregoing is merely exemplary of the present utility model and is not intended to limit the present utility model. Various modifications and variations of the present utility model will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are to be included in the scope of the claims of the present utility model.

Claims

1. The utility model provides a lower inner shell of battery package, its characterized in that adopts non-metal composite material to make, lower inner shell includes down the inner shell body, the bottom edge of lower inner shell body is equipped with the inner shell step of inside shrink, the inner shell step is used for supporting the battery module of putting into down in the inner shell body.

2. The lower inner case of a battery pack according to claim 1, wherein the battery module includes a plurality of cells and end plates disposed at opposite sides of the plurality of cells, and the inner case step is for supporting the end plates of the battery module.

3. The lower inner case of a battery pack according to claim 2, wherein the upper surface of the inner case step is provided with a screw hole extending downward for fixing the end plate of the battery module.

4. A lower inner case of a battery pack according to claim 3, wherein the screw hole of the inner case step is formed by embedding an insert nut at the time of non-metal composite molding.

5. The lower inner case of a battery pack according to claim 4, wherein the side surface of the embedded nut is connected to the side wall of the step of the inner case.

6. The lower inner case of a battery pack according to claim 1, wherein an upper surface of the inner case step is bonded to the battery module.

7. The lower inner case of a battery pack according to claim 1, wherein a temperature regulating mechanism is provided at the bottom of the lower inner case body within an interval defined by the steps of the inner case, and the upper surface of the temperature regulating mechanism is in contact with the battery module.

8. The lower inner case of a battery pack according to claim 7, wherein an upper surface of the temperature regulating mechanism is bonded to the battery module;

and/or the temperature regulating mechanism is connected with the bottom surface of the lower inner shell body in an adhesive manner;

and/or, the temperature regulating mechanism is in interference fit with the step of the inner shell.

9. The lower inner case of a battery pack according to claim 7 or 8, wherein the temperature regulating mechanism comprises a liquid cooling pipe or a liquid cooling plate.

10. The lower inner case of a battery pack according to any one of claims 1 to 8, further comprising an inner reinforcing structure provided inside the lower inner case body.

11. The lower inner case of a battery pack according to claim 10, wherein the inner reinforcing structure comprises reinforcing plates, both ends of the reinforcing plates in the width direction of the lower inner case body being connected to both inner surfaces of the lower inner case body.

12. The lower inner case of a battery pack according to claim 11, wherein the inner side of the lower inner case body has a predetermined inner case catching groove through which the reinforcing plate is fixed;

or, the inner reinforcing structure is connected with the lower inner shell in an adhesive manner.

13. The lower inner case of a battery pack according to claim 11, wherein the reinforcing plate is made of metal;

14. The lower inner case of a battery pack according to claim 11, wherein the lower end of the reinforcing plate abuts on an inner case step provided at the bottom edge of the lower inner case body, and a drop exists between the reinforcing plate and the bottom surface of the lower inner case body, the drop being used for mounting the temperature regulating mechanism.

15. A lower case of a battery pack, characterized in that it comprises a lower outer case and a lower inner case of the battery pack according to any one of claims 1 to 14, which are mutually sleeved, the lower outer case being made of a nonmetallic composite material.

16. The lower case of a battery pack according to claim 15, wherein a bottom edge of the lower outer case is provided with an inwardly contracted outer case step fitted to the inner case step of the bottom edge of the lower inner case body, and a bottom of the lower outer case is formed with a groove for matching with the protrusion of the upper cover using the outer case step.

17. The lower case of a battery pack according to claim 15, wherein the lower inner case further comprises a lower case sidewall reinforcement structure disposed outside an edge of the lower inner case body, the edge of the lower outer case being connected to the lower case sidewall reinforcement structure.

18. The lower case of a battery pack according to claim 15, wherein a lower case gap is provided between the lower outer case and the lower inner case, and the lower case gap is filled with a heat insulating layer.

19. A battery compartment comprising an upper cover and a lower casing according to any one of claims 15 to 18.

20. A battery pack comprising the battery case according to claim 19, or the lower case according to any one of claims 15 to 18.