CN117175114A - Inferior valve, heat preservation battery package and battery package assembly of battery package - Google Patents

Abstract

The application relates to the technical field of electric automobiles and discloses a lower shell of a battery pack, which comprises a lower outer shell and a lower inner shell which are mutually sleeved, wherein the lower outer shell and the lower inner shell are made of nonmetal composite materials, the lower inner shell comprises a lower inner shell body and a lower shell side wall reinforcing structure arranged outside the edge of the lower inner shell body, and the edge of the lower outer shell is connected with the lower shell side wall reinforcing structure. The application has the effect of improving the strength of the heat-insulating battery box.

Description

Inferior valve, heat preservation battery package and battery package assembly of battery package

The present application claims priority from chinese patent application CN 202210625736.2 on application day 2022, month 06, 02 and chinese patent application CN 202211743315.6 on application day 2022, month 12, 30. The present application incorporates the entirety of the above-mentioned chinese patent application.

Technical Field

The application relates to the field of electric automobiles, in particular to a lower shell of a battery pack, a heat-preservation battery pack and a battery pack assembly.

Background

Battery modules and electric components (e.g., a control board, etc.) of electric vehicles are often mounted in a battery box. The battery box is used for helping the battery module and the electric element to be insulated and waterproof and protecting the battery module and the electric element from collision.

In order to ensure that the battery module and the electrical element in the battery box are not damaged, the strength of the battery box needs to be ensured. In the prior art, in order to increase the strength of the battery case, it is common to increase the strength of the battery case by using a case material having higher strength. Therefore, the electric vehicles on the market at present basically adopt a battery box made of metal plates. On the one hand, the improved strength is limited by the materials, and high requirements are set for the performance of the materials, so that the cost is easily increased greatly. And the sheet metal material has high heat conductivity coefficient and poor heat preservation performance, and limits the popularization of the electric automobile in cold areas.

Disclosure of Invention

In order to improve the strength of a battery box, the application provides a lower shell of a battery pack, a heat-insulating battery pack and a battery pack assembly.

The application provides a lower shell of a battery pack, which adopts the following technical scheme:

the utility model provides a inferior valve of battery package, includes shell and lower inner shell down that mutually overlaps and establish, shell and lower inner shell all adopt non-metal composite to make down, down the inner shell include down the inner shell body with set up in the inferior valve lateral wall additional strengthening in the edge outside of lower inner shell body, down the edge of shell with inferior valve lateral wall additional strengthening is connected.

Through adopting above-mentioned technical scheme, set up inferior valve lateral wall additional strengthening in the edge outside of inferior valve body, the edge of inferior valve is connected with inferior valve lateral wall additional strengthening, improves the intensity of battery box.

Optionally, the lower shell side wall reinforcing structure comprises a plurality of lower shell reinforcing vertical plates extending outwards along a direction perpendicular to the side wall of the lower inner shell body, and the extending direction of the lower shell reinforcing vertical plates is perpendicular to the extending direction of the lower shell reinforcing transverse plates;

and/or the lower shell side wall reinforcing structure comprises a lower shell reinforcing transverse plate connected with the distal end of each lower shell reinforcing vertical plate, and the extending direction of the lower shell reinforcing transverse plate is parallel to the extending direction of the side wall of the lower inner shell body; the edge of the lower shell is connected with the lower shell reinforcing transverse plate, and preferably, the edge of the lower shell is connected with the lower shell reinforcing transverse plate in a staggered or connected mode.

Through adopting above-mentioned technical scheme, the holistic extending direction of riser is strengthened to inferior valve is perpendicular with the lateral wall direction of lower inner shell body, and inferior valve strengthens the diaphragm and is located the distal end of riser is strengthened to inferior valve, be located the inferior valve and strengthen the one end that the lateral wall of riser kept away from lower inner shell body promptly, because inferior valve lateral wall reinforced structure is connected with the edge of inferior valve, consequently the lower valve of perpendicular to lateral wall direction of lower inner shell body strengthens the riser and provides the installation space that outwards extends for inferior valve reinforced diaphragm, make inferior valve reinforced diaphragm can be connected smoothly with the edge of inferior valve, inferior valve reinforced diaphragm's extending direction is parallel to the extending direction of the lateral wall of lower inner shell body, promptly inferior valve reinforced diaphragm's extending direction is same with inferior valve reinforced diaphragm's extending direction perpendicularly. Therefore, when the lower inner shell is sleeved at the lower outer shell, the lower shell reinforcing transverse plate in the lower inner shell can be better connected with the edge of the lower outer shell, the edge of the lower outer shell is connected with the lower shell reinforcing transverse plate in a staggered manner, the positioning is convenient, the connecting area is relatively large, the connecting is adopted, and the connecting is more stable after the connecting.

Optionally, each of the lower shell reinforcing vertical plates is connected with a plurality of lower shell reinforcing transverse plates; a plurality of lower shell reinforcing transverse plates at the lower shell reinforcing vertical plates are arranged at intervals; and/or a plurality of lower shell reinforcing transverse plates at each lower shell reinforcing vertical plate are mutually parallel.

Through adopting above-mentioned technical scheme, through all setting up a plurality of inferior valve reinforcing cross plates in each inferior valve reinforcing riser department, ensure that every inferior valve reinforcing riser all can be connected with the edge of inferior valve through a plurality of inferior valve reinforcing cross plates to further improve the joint strength after the connection.

Optionally, the edge of the lower shell is integrally connected with the lower shell side wall reinforcing structure.

Through adopting above-mentioned technical scheme, because inferior valve lateral wall additional strengthening is as the part of inferior valve, consequently when inferior valve shaping, inferior valve lateral wall additional strengthening also can corresponding shaping, and the edge of inferior valve is being connected when shaping with inferior valve lateral wall additional strengthening like this, can obtain better joint strength and installation stability.

Optionally, the thickness of the lower inner shell is greater than the thickness of the lower outer shell.

Through adopting above-mentioned technical scheme, the inferior valve of battery package is constituteed jointly to inferior valve and inferior valve, and inferior valve cover is established in the inside of inferior valve, therefore under the certain prerequisite of overall dimension, makes the thickness of inferior valve great relatively, can protect the part in the inferior valve better.

Optionally, a lower shell gap is arranged between the lower outer shell and the lower inner shell, and an insulation layer is filled in the lower shell gap, preferably, the interval of the lower shell gap at the side surface of the lower shell is larger than the interval of the lower shell gap at the bottom of the lower shell.

Through adopting above-mentioned technical scheme, through setting up the heat preservation, can realize the heat preservation of battery package better to improve the performance of battery package, compare in inferior valve bottom, inferior valve side is great to the region, therefore inferior valve clearance of inferior valve side department is great relatively, can pack more heat preservation, thereby realizes better heat preservation. Optionally, the lower shell sidewall reinforcement structure has a flange face extending horizontally outward; the flange surface is provided with a lower shell mounting hole extending downwards, the lower shell mounting hole is used for connecting a connecting piece to fix the lower shell, and the lower shell mounting hole is connected with the side wall of the lower inner shell body through reinforcing ribs arranged at intervals; alternatively, the flange face is crimped to fix the lower case.

Through adopting above-mentioned technical scheme, the inferior valve mounting hole that flange face department formed can supply the connecting piece to use thereby fixed inferior valve, can play the effect of reinforcing structural strength equally, and through opening inferior valve mounting hole to use the connecting piece to fix, simple structure just easy to assemble; while the flange face can be crimped to secure the lower shell; the flange face is more complete in structure and higher in structural strength.

Optionally, the lower inner shell further comprises a sealing groove arranged at the outer side of the edge of the lower inner shell body, the sealing groove is used for accommodating a sealing strip, and the sealing strip is used for being matched with the lower shell and the upper cover to realize sealing.

Through adopting above-mentioned technical scheme, the sealing strip is located the junction of epitheca and inferior valve to make the epitheca be connected inseparabler with inferior valve, realize the sealing to the junction, avoid impurity entering such as steam or dust.

Optionally, in the vertical height direction, the lower shell sidewall reinforcement structure is located below the seal groove; and/or, in the horizontal direction, the outer side surface of the lower shell side wall reinforcing structure protrudes out of the outer side surface of the sealing groove.

Through adopting above-mentioned technical scheme, make inferior valve lateral wall additional strengthening's lateral surface protrusion in the lateral surface of seal groove, can enough guarantee inferior valve lateral wall additional strengthening's length to can extend to the edge of inferior valve, avoid the position of seal groove too near the edge of inferior valve simultaneously, influence the structural strength of seal groove.

Optionally, be equipped with the buckle riser on the lateral wall of lower inner shell body, be equipped with the buckle on the buckle riser, the buckle lock sets up in the knot hole of upper cover.

Through adopting above-mentioned technical scheme, through the inferior valve lateral wall additional strengthening who sets up in the edge outside of inferior valve body to strengthen the structural strength after inferior valve and inferior valve are connected.

Optionally, a plurality of first concave portions are formed on the side wall of the lower shell at intervals along the circumferential direction, and convex portions protruding outside the first concave portions are formed adjacent to the first concave portions; or, the lower inner shell is provided with a vertical rib plate, the vertical rib plate is positioned at the side parts of the first concave part and the convex part, and a filling gap is formed between the vertical rib plate and the side wall of the lower outer shell; preferably, a chamfer structure is formed at the bottom of the vertical rib plate.

Through adopting above-mentioned technical scheme, have the clearance between lower inner shell and the lower shell, the clearance department can be through filling the heat preservation, realizes the heat preservation of battery package, and through setting up a plurality of vertical gusset to the region that encloses can fix a position and hold and be used for thermal-insulated heat preservation.

Optionally, the lower inner case further includes an inner reinforcing structure disposed at an inner side of the lower inner case body, the inner reinforcing structure including an inner reinforcing plate connected to an inner wall of the lower inner case in a width direction of the lower inner case body; and/or, inside additional strengthening still includes the inner shell step, the inner shell step set up in the bottom edge of lower inner shell body and inwards shrink, the inner shell step is used for supporting and puts into the battery module in the lower inner shell body, the bottom edge of lower shell body is equipped with the inwards shrink step with lower inner shell bottom edge looks adaptation, step department form with the protruding assorted recess of edge of upper cover.

By adopting the technical scheme, the internal reinforcing structure can enhance the structural strength of the lower inner shell, so that the overall structural strength of the heat-insulation battery pack is improved, and the overall strength of the lower inner shell is improved by connecting the reinforcing plate with the inner surfaces of the two sides of the lower inner shell body; and the inner shell step is arranged at the lower inner shell body, so that the bottom strength of the lower inner shell body can be increased.

The application also provides a heat-preservation battery pack, which comprises the lower shell of the battery pack.

Optionally, the heat-preservation battery pack further comprises an upper cover matched with the lower shell, and the upper cover is made of a nonmetallic composite material.

The application also provides a battery pack assembly, which comprises an outer container, wherein a plurality of battery pack placement areas are respectively arranged in the outer container, standard pack components are arranged in each battery pack placement area, each standard pack component comprises at least one at least two heat-preservation battery packs, and the heat-preservation battery packs are mutually stacked along the vertical direction.

By adopting the technical scheme, the application has the following technical effects: firstly, the box adopts the double-deck shell structure of constituteing by lower inner shell and shell down, and keeps warm effectually, and lower inner shell and shell all are set up to the structure of being made by non-metal composite material down, compare in the structure of being made by the metal, non-metal composite material texture is light, thermal insulation performance is good, can solve the heat preservation problem when the battery package is used in low temperature region. And secondly, a lower shell side wall reinforcing structure is arranged outside the edge of the lower inner shell body, the edge of the lower outer shell is connected with the lower shell side wall reinforcing structure, and the strength of the battery box is improved. Through set up inferior valve lateral wall additional strengthening in the edge outside of inferior valve body, the edge of inferior valve is connected with inferior valve lateral wall additional strengthening, improves the intensity of battery box.

Drawings

FIG. 1 is a schematic view of a portion of a battery pack assembly according to an embodiment of the present application;

FIG. 2 is a schematic view of the structure of a portion of a thermal insulation battery pack in an embodiment of the application;

FIG. 3 is a schematic view of the structure of the upper cover part in the embodiment of the present application;

FIG. 4 is a schematic view of the structure of the lower housing part in an embodiment of the present application;

fig. 5 is an enlarged view of a portion a in fig. 4.

Reference numerals: 1000. a battery pack assembly; 100. an outer bladder; 200. a heat-preserving battery pack; 210. an upper cover; 211. a cover top; 212. a cover side; 213. edge bulge; 220. a lower housing; 300. a concave-convex reinforcing structure; 310. a first concave portion; 320. a protruding portion; 330. and a second concave portion.

Detailed Description

The application is described in further detail below with reference to fig. 1-5.

The embodiment of the application discloses a battery pack assembly 1000. Referring to fig. 1, a battery pack assembly 1000 includes an outer container 100, a plurality of battery pack placement areas are provided in the outer container 100, each battery pack placement area is provided with a standard pack assembly, each standard pack assembly includes two thermal insulation battery packs 200, and the thermal insulation battery packs 200 are stacked on each other along a vertical direction.

The thermal insulation battery pack 200 comprises a lower shell, wherein the lower shell comprises a lower outer shell 220 and a lower inner shell which are mutually sleeved, the lower outer shell 220 and the lower inner shell are made of nonmetallic composite materials, the lower inner shell comprises a lower inner shell body and a lower shell side wall reinforcing structure arranged outside the edge of the lower inner shell body, and the edge of the lower outer shell 220 is connected with the lower shell side wall reinforcing structure.

In the present application, the thermal insulation battery pack 200 further includes an upper cover 210 coupled with the lower case, the upper cover 210 being mounted at the lower case, wherein the upper cover 210 includes a cover top 211 and a cover side 212.

It will be appreciated that the two thermal insulation battery packs in each standard pack assembly are stacked upon each other when arranged, i.e. the upper surface of the thermal insulation battery pack located at the lower side corresponds to the lower surface of the thermal insulation battery pack located at the upper side, and preferably, the cover side 212 is provided with an edge protrusion 213, and since the edge protrusion 213 is formed at the upper cover 210, a recess is provided at the lower surface of the other thermal insulation battery pack, and the edge protrusion 213 cooperates with the recess to achieve stable installation of the two stacked thermal insulation battery packs.

Preferably, because two heat preservation battery packs can stack each other, so in order to guarantee the convenience of installation between two heat preservation battery packs, two heat preservation battery packs in every standard package subassembly all set up the edge in upper cover department protruding, set up in the lower surface with another heat preservation battery pack protruding matched with sunken to need not to adjust the order when heat preservation battery pack is laid, reduce the working strength when heat preservation battery pack stacks.

In the application, as each heat-preservation battery pack is provided with the bulge and the recess, preferably, the edge bulge is arranged close to the side edge of the heat-preservation battery pack, and the recess is also arranged close to the side edge of the heat-preservation battery pack, so that the correspondence of the edge bulge and the recess is realized, and the edge bulge and the recess are both positioned at the side edge, so that the mounted bearing point is transferred to the edge of the heat-preservation battery pack.

In one embodiment, a plurality of edge bulges are arranged at each heat-insulating battery pack, the plurality of edge bulges are arranged around the edges of the heat-insulating battery packs, and correspondingly, a plurality of pits are also arranged at each heat-insulating battery pack and are also arranged around the edges of the heat-insulating battery packs, so that the stability of the heat-insulating battery packs stacked up and down after being connected and the accuracy of positioning are improved; or, in another embodiment, the edge protrusions are continuously arranged, that is, the edge protrusions are distributed around the upper shell, so that stability after connection and positioning accuracy of the heat-insulation battery packs stacked up and down can be improved.

The lower shell and the lower inner shell are sleeved with each other to form a double-layer shell structure, and the battery module in the lower shell is subjected to double protection and heat preservation, wherein the lower shell and the lower inner shell are sleeved with each other.

Preferably, the thickness of the lower inner case is greater than that of the lower outer case 220, the lower inner case and the lower outer case together form the lower case of the battery pack, and the lower inner case is sleeved inside the lower outer case, so that the thickness of the lower inner case is relatively greater on the premise of a certain overall size, and components in the lower inner case can be better protected.

In the application, the lower outer shell and the lower inner shell sleeved in the lower outer shell are both made of the non-metal composite material, compared with a structure made of metal, the non-metal composite material has good heat preservation performance, can solve the heat preservation problem of the battery pack in a low air temperature area, has lighter texture and simpler production process, thereby reducing the production cost and improving the economic benefit of the battery pack.

Specifically, the lower outer shell and the lower inner shell are made of non-metal composite materials, wherein the non-metal composite materials comprise fiber reinforced resin matrix composite materials, and the fiber reinforced resin matrix composite materials are preferably one or more of glass fiber reinforced resin matrix composite materials, carbon fiber reinforced resin matrix composite materials, resin fiber reinforced resin matrix composite materials and ceramic fiber reinforced resin matrix composite materials.

As a preferable mode of the embodiment, SMC (Sheet molding compound), also called sheet molding compound, is selected as the nonmetallic composite material for manufacturing the lower inner shell and the lower outer shell, and is a polymer composite material, and the main raw materials of the nonmetallic composite material comprise SMC special yarns, unsaturated resin, low-shrinkage additives, fillers and various auxiliary agents. The metal material box has the advantages of high mechanical strength, light weight, corrosion resistance, long service life, high insulating strength, arc resistance, flame retardance, good sealing performance, high specific heat capacity, flexible product design, easy mass production, safety and attractive appearance, all-weather protection, capability of meeting the requirements of various severe environments and places in outdoor engineering projects, and capability of overcoming the defects of easy corrosion, short service life, poor heat insulation and heat preservation performance and the like of the metal material box.

In addition, the lower inner shell includes down the inner shell body and sets up in the inferior valve lateral wall additional strengthening in the edge outside of lower inner shell body, through setting up inferior valve lateral wall additional strengthening, can strengthen the structural strength of lower inner shell body self, and the edge of shell is connected with inferior valve lateral wall additional strengthening down simultaneously, and inferior valve lateral wall additional strengthening is located the junction, and the lower inner shell passes through inferior valve lateral wall additional strengthening promptly and is connected with lower shell, can strengthen the structural strength of junction equally.

In particular, the lower case side wall reinforcing structure includes a plurality of lower case reinforcing risers extending outwardly in a direction perpendicular to the side wall of the lower inner case body, and lower case reinforcing cross plates respectively connected to distal ends of the respective lower case reinforcing risers, and edges of the lower case 220 are connected to the lower case reinforcing cross plates.

Regarding the connection manner of the lower case reinforcing vertical plate and the lower case reinforcing horizontal plate, the following embodiments can be adopted:

example 1: because the extending direction of the lower shell reinforcing vertical plate is perpendicular to the side wall direction of the lower inner shell body when the lower shell reinforcing vertical plate is arranged, in the embodiment, the whole extending direction of the lower shell reinforcing vertical plate is perpendicular to the side wall direction of the lower inner shell body, and the lower shell reinforcing transverse plate is positioned at the far end of the lower shell reinforcing vertical plate, namely at one end of the lower shell reinforcing vertical plate far away from the side wall of the lower inner shell body; in this embodiment, the extending direction of the lower case reinforcing cross plate is parallel to the extending direction of the side wall of the lower inner case body, that is, the extending direction of the lower case reinforcing cross plate is also perpendicular to the extending direction of the lower case reinforcing vertical plate. Therefore, when the lower inner shell is sleeved at the lower outer shell, the lower shell reinforcing transverse plate in the lower inner shell can be better connected with the edge of the lower outer shell.

Example 2: although the lower case reinforcing vertical plate extends outward in the direction perpendicular to the side wall of the lower inner case body, the extending direction of the lower case reinforcing vertical plate is not limited, that is, the extending direction of the lower case reinforcing vertical plate at the portion contacting the lower inner case body is perpendicular to the side wall of the lower inner case body, but the extending direction of the whole lower case reinforcing vertical plate is not limited, so that the present embodiment is different from embodiment 1 in that the extending direction of the lower case reinforcing vertical plate is not limited, and the extending direction of the lower case reinforcing horizontal plate is parallel to the extending direction of the side wall of the lower inner case body, that is, the extending direction of the whole lower case reinforcing vertical plate and the extending direction of the side wall of the lower inner case body are inclined in the present application, so that the lower case reinforcing horizontal plate is also inclined with respect to the whole lower case reinforcing vertical plate.

Example 3: in this embodiment, unlike embodiment 1 and embodiment 2, in this embodiment, the extending direction of the lower case reinforcing vertical plate as a whole is perpendicular to the side wall direction of the lower inner case body, and when the lower case reinforcing horizontal plate is connected to the lower case reinforcing vertical plate, the extending direction of the lower case reinforcing horizontal plate is inclined with the extending direction of the lower case reinforcing vertical plate.

In the present application, the lower case reinforcing cross plates are connected to the lower case reinforcing vertical plates, and as a preferred embodiment, a plurality of lower case reinforcing cross plates are connected to the lower case reinforcing vertical plates, and the lower case reinforcing cross plates are connected to the edges of the lower case, so that by providing a plurality of lower case reinforcing cross plates at the lower case reinforcing vertical plates, each lower case reinforcing vertical plate can be connected to the edges of the lower case through the plurality of lower case reinforcing cross plates, thereby further improving the connection strength after connection.

As for the connection manner of the plurality of lower case reinforcing cross plates in each lower case reinforcing vertical plate, the following embodiments can be adopted:

example 4: in the present embodiment, a plurality of lower shell reinforcing cross plates at each lower shell reinforcing vertical plate are arranged at intervals; the lower shell reinforcing transverse plates are connected to the corresponding lower shell reinforcing vertical plates, and meanwhile the lower shell reinforcing transverse plates are arranged at intervals, so that gaps are formed between the adjacent lower shell reinforcing transverse plates correspondingly, the area occupied by the lower shell reinforcing transverse plates at the lower shell reinforcing vertical plates is expanded, the connection area with the edge of the lower shell is enlarged, higher-strength connection is achieved, the lower shell reinforcing transverse plates are arranged at intervals, the lower shell reinforcing transverse plates are uniformly arranged at the lower shell reinforcing vertical plates, and the overall weight distribution of the lower shell reinforcing vertical plates is more uniform and can be connected better.

Example 5: in the present embodiment, a plurality of lower shell reinforcing cross plates at each lower shell reinforcing vertical plate are parallel to each other; the lower shell reinforcing transverse plates are provided with a plurality of lower shell reinforcing vertical plates, the lower shell reinforcing vertical plates are provided with a plurality of lower shell reinforcing transverse plates, and the lower shell reinforcing transverse plates are mutually parallel, namely, the lower shell reinforcing transverse plates are distributed along the extending direction of the lower shell reinforcing vertical plates, so that the lower shell reinforcing transverse plates at the lower shell reinforcing vertical plates are ensured to be connected in order.

It will be appreciated that, since the plurality of lower shell reinforcing cross plates are connected to each lower shell reinforcing vertical plate, and the plurality of lower shell reinforcing cross plates in each lower shell reinforcing vertical plate do not affect the connection of the other lower shell reinforcing cross plates, the plurality of lower shell reinforcing cross plates in each lower shell reinforcing vertical plate are preferably arranged at intervals and are parallel to each other when being arranged.

In the application, the lower shell side wall reinforcing structure is connected with the edge of the lower shell through the lower shell reinforcing transverse plate, in particular, the edge of the lower shell 220 is connected with the lower shell reinforcing transverse plate in a staggered or connected manner; the edge of the lower shell is connected with the lower shell reinforcing transverse plate in a staggered mode, positioning is convenient, the connecting area is relatively large, the connecting mode is adopted, and the connecting mode is stable after the connecting mode.

In the present application, since the edge of the lower case is connected to the lower case sidewall reinforcement structure, which includes the lower case reinforcement riser and the lower case reinforcement cross plate connected to the distal end of the lower case reinforcement riser, specifically, the edge of the lower case 220 is connected to the lower case sidewall reinforcement structure when the lower case 220 and the lower inner case are formed; because inferior valve lateral wall additional strengthening is as the part of inferior valve, consequently when inferior valve shaping, inferior valve lateral wall additional strengthening also can corresponding shaping, and the edge of inferior valve is connected when shaping with inferior valve lateral wall additional strengthening like this, can obtain better joint strength and installation stability.

In another embodiment, the edge of the lower shell and the lower shell side wall reinforcing structure can be connected in an adhesive manner, for example, the edge of the lower shell and the lower shell side wall reinforcing structure can be adhered by glue, specifically, because the line-of-sight structure reinforcing manner is to connect the edge of the lower shell and the lower shell side wall reinforcing structure, the occupied area of the lower shell side wall reinforcing structure is smaller than that of the edge of the lower shell, so that the applied glue can be used for adhering, the adhesive accuracy is improved, the adhesive surface is formed by uniformly applying the glue at the lower shell side wall reinforcing structure, the adhesive surface is adhered with the edge of the lower shell, the adhesive uniformity of the edge of the lower shell and the lower shell side wall reinforcing structure is ensured, and the adhesive for adhering the edge of the lower shell and the lower shell side wall reinforcing structure can be structural adhesive; for example, the nonmetallic composite material in a molten state has stronger viscosity, so that before the lower inner shell and the lower outer shell which are made of the nonmetallic composite material are solidified and formed, the lower shell side wall reinforcing structure at the lower inner shell and the edge of the lower outer shell can be bonded together, and the lower shell side wall reinforcing structure and the lower outer shell are bonded and connected conveniently and quickly.

In the present application, the lower shell sidewall reinforcement structure has a flange face extending horizontally outwardly; because inferior valve lateral wall additional strengthening sets up in the edge outside of inferior valve body, and the inboard of inferior valve is located to inferior valve cover, consequently inferior valve lateral wall additional strengthening is established to protruding, and correspondingly, just can produce the clearance between inferior valve body and the inferior valve, and the flange face is located inferior valve lateral wall additional strengthening department between inferior valve body and the inferior valve and extends to form to pack the region of inferior valve lateral wall additional strengthening between inferior valve body and the inferior valve not setting up inferior valve lateral wall additional strengthening, thereby effectively strengthen the structural strength after inferior valve and inferior valve are connected.

Example 6: in the embodiment, a lower shell mounting hole extending downwards is formed in the flange surface and is used for connecting a connecting piece to fix the lower shell, and the lower shell mounting hole is connected with the side wall of the lower inner shell body through reinforcing ribs arranged at intervals; the lower shell mounting hole that flange face department formed can supply the connecting piece to use thereby fixed lower shell, can play the effect of reinforcing structural strength equally, and through opening lower shell mounting hole to use the connecting piece fixed, simple structure, and easy to assemble.

Because the inferior valve mounting hole forms in the horizontal plane department of outwards extending, has the clearance equally between inferior valve mounting hole and the lateral wall of inferior valve body, consequently through setting up the strengthening rib between inferior valve mounting hole and the lateral wall of inferior valve body to strengthen the structural strength of inferior valve mounting hole department, the connecting piece is also more stable after installing to inferior valve mounting hole department.

Preferably, the lower shell mounting hole is formed by embedding an embedded nut in the non-metal composite material during molding, and the inner wall of the embedded nut is a smooth surface or a threaded surface.

The top end surface of the embedded nut is flush with the flange surface of the lower shell side wall reinforcing structure or protrudes out of the flange surface, and meanwhile, the bottom end surface of the embedded nut is flush with the flange surface of the lower shell side wall reinforcing structure or protrudes out of the flange surface; therefore, the connecting piece is prevented from being in direct contact with the nonmetallic composite material, and the stress transmitted by the connecting piece is completely transmitted to the flange surface through the embedded nut.

Example 7: in this embodiment, the flange face can be crimped to secure the lower shell; the flange face is more complete in structure and higher in structural strength.

In the present application, the lower case is composed of the lower outer case and the lower inner case, and for the battery pack, it includes not only the upper case which is also included to be able to be matched with the lower case, thereby realizing the overall sealing of the battery pack, preferably, the lower inner case further includes a sealing groove provided at the outer side of the edge of the lower inner case body, the sealing groove is used to accommodate a sealing strip, and the sealing strip is used to be matched with the lower case and the upper cover 210 to realize the sealing; the upper shell is in the state of installing to the inferior valve, and the sealing strip is located upper shell and inferior valve junction to make the upper shell be connected inseparabler with the inferior valve, realize the sealing to junction, avoid impurity entering such as steam or dust.

Wherein, because the seal groove sets up in the edge outside of lower inner shell body, lower shell lateral wall additional strengthening is also located the edge outside of lower inner shell body simultaneously, and seal groove and lower shell lateral wall additional strengthening all offer in lower inner shell body department promptly, about the connected mode of seal groove and lower shell lateral wall additional strengthening, it can adopt following embodiment:

example 8: in the vertical height direction, the lower shell side wall reinforcing structure is positioned below the sealing groove; the lower shell side wall reinforcing structure is separated from the sealing groove in the height direction, the sealing groove is not flush, and the sealing structure is prevented from being failed at the same time after the lower shell side wall reinforcing structure is broken and damaged by external force.

It can be understood by those skilled in the art that the sealing groove is formed by being arranged at the outer side of the edge of the lower inner shell body, and the sealing groove is formed by being concave, and the lower shell side wall reinforcing structure is also arranged at the outer side of the edge of the lower inner shell body, but the lower shell side wall reinforcing structure is formed by being convex, so that the lower shell side wall reinforcing structure is arranged below the sealing groove, namely, a height difference exists between the lower shell side wall reinforcing structure and the sealing groove.

As a preferable mode in this embodiment, the top surface of the lower shell side wall reinforcing structure is located below the bottom surface of the groove of the sealing groove, and the top surface and the bottom surface are further pulled apart to avoid damage to the lower shell side wall reinforcing structure from affecting the sealing structure.

Example 9: in the horizontal direction, the outer side surface of the lower shell side wall reinforcing structure protrudes out of the outer side surface of the sealing groove; the inferior valve lateral wall additional strengthening sets up in the lateral surface of inferior valve inner shell body, and the seal groove sets up in the edge outside of inferior valve inner shell body, and because inferior valve lateral wall additional strengthening is used for being connected with the edge of inferior valve, and the seal groove then plays sealed effect when upper cover and lower cover cooperate, consequently make inferior valve lateral wall additional strengthening's lateral surface protrusion in the lateral surface of seal groove, can enough guarantee inferior valve lateral wall additional strengthening's length to can extend to the edge of inferior valve, avoid the position of seal groove too near the edge of inferior valve simultaneously, influence the structural strength of seal groove.

In the application, when the upper cover is matched with the lower cover, the sealing groove is formed in the lower inner shell body and the sealing strip is accommodated in the sealing groove, so that the upper cover and the lower cover are matched and sealed, meanwhile, the buckle vertical plate is arranged on the side wall of the lower inner shell body, the buckle is arranged on the buckle vertical plate and matched with the buckling hole arranged on the upper cover 210, the upper cover 210 is connected with the lower inner shell, and the upper cover is conveniently connected with the lower cover through the matching of the buckle and the buckling hole. In the present application, the structural strength of the lower inner shell and the lower outer shell after connection is reinforced by the lower shell sidewall reinforcement structure disposed outside the edge of the lower inner shell body, the lower outer shell is further provided with a concave-convex reinforcement structure 300, specifically, the sidewall of the lower outer shell 220 is formed with a plurality of first concave portions 310 at intervals along the circumferential direction, and the adjacent first concave portions 310 form convex portions 320 protruding outside the first concave portions 310.

Preferably, the first concave portions 310 are circumferentially arranged along the side wall of the lower housing, and accordingly, the number of the convex portions 320 formed between the adjacent first concave portions 310 is also plural, and the plurality of convex portions are intermittently arranged, or the plurality of convex portions are alternately arranged.

It will be appreciated that the concave-convex reinforcement structure 300 may also be provided with convex protrusions on the side wall of the lower housing, and the adjacent protrusions form first concave portions correspondingly.

In the application, the bottom of the protruding part is also provided with the second concave part 330, and the second concave part 330 can conveniently extend into the protruding part, so that the heat-preservation battery pack can be conveniently carried.

In the application, the lower inner shell is provided with the vertical rib plates, a filling gap is formed between the vertical rib plates and the side wall of the lower outer shell 220, namely, a gap is formed between the lower inner shell and the lower outer shell, the gap can be filled with a heat preservation layer to realize heat preservation of the battery pack, and a plurality of vertical rib plates are arranged, so that the enclosed area can be used for positioning and accommodating the heat preservation layer for heat preservation; it can be appreciated that, because the lower outer shell is circumferentially provided with a plurality of first concave portions and convex portions, and the vertical rib plates are arranged at the lower inner shell, namely, the vertical rib plates are correspondingly arranged with the first concave portions and the convex portions, preferably, the vertical rib plates are positioned at the side portions of the first concave portions and the convex portions.

Preferably, the bottom of the vertical rib plate is provided with a chamfer structure.

In the application, the lower inner shell further comprises an inner reinforcing structure arranged on the inner side of the lower inner shell body, and the structural strength of the lower inner shell can be enhanced through the inner reinforcing structure, so that the integral structural strength of the heat-insulation battery pack is improved. Specifically, the inner reinforcing structure includes an inner reinforcing plate connected to an inner wall of the lower inner case in a width direction of the lower inner case body; through being connected the reinforcing plate with the both sides internal surface of lower inner shell body, improve the bulk strength of lower inner shell.

Preferably, the inner side of the lower inner shell body is provided with a preset inner shell clamping groove, and the inner reinforcing plate is fixed through the inner shell clamping groove. The inner shell clamping groove is arranged for positioning the inner reinforcing plate, so that the inner shell clamping groove is convenient to fix the inner reinforcing plate to the lower inner shell body in a preset position.

The material of the inner reinforcing plate can be selected as metal, for example, aluminum plate, or the lower outer shell and the lower inner shell are made of nonmetallic composite materials, so that the material of the inner reinforcing plate can be the same as that of the lower inner shell, and the inner reinforcing plate is made of nonmetallic composite materials, thereby being convenient for one-step processing and forming.

In the present application, the inner reinforcement structure further includes an inner case step provided at the bottom edge of the lower inner case body and inwardly contracted, the inner case step being for supporting the battery module placed in the lower inner case body; the inner shell step is arranged at the lower inner shell body, so that the bottom strength of the lower inner shell body can be increased.

Preferably, the battery module comprises a plurality of electric cells and end plates arranged on two opposite sides of the electric cells, and the inner shell step is used for supporting the end plates of the battery module.

Preferably, in the range of the interval surrounded by the inner shell steps, a temperature regulating mechanism is arranged at the bottom of the lower inner shell body, and the upper surface of the temperature regulating mechanism is contacted with the battery module; the upper surface of the temperature regulating mechanism is also adhered to the battery module; wherein, temperature regulation and control mechanism includes liquid cooling pipe or liquid cooling board.

Preferably, the lower end of the inner reinforcing plate is abutted at the step of the inner shell, and a drop exists between the reinforcing plate and the bottom surface of the lower inner shell body, and the drop is used for installing the temperature regulating mechanism.

In the present application, the bottom edge of the body of the lower outer case 220 is provided with an inwardly contracted step adapted to the bottom edge of the lower inner case, and a recess is formed at the step to be matched to the edge protrusion 213 of the upper cover 210.

Compared with the method for improving the strength of the battery box by using the high-strength box material, the method has the advantages that the lower shell side wall reinforcing structure, the inner reinforcing structure and the like are arranged at the lower inner shell, so that the structural strength of the box is improved while the box material is not changed, the cost is reduced, different environments can be used for the box, and the applicability is wider.

In the present application, a lower case gap is provided between the lower outer case 220 and the lower inner case, and the lower case gap is filled with an insulation layer; through setting up the heat preservation, can realize the heat preservation of battery package better to improve the performance of battery package.

Specifically, the interval of the lower shell gap at the side surface of the lower shell is larger than the interval of the lower shell gap at the bottom of the lower shell, and compared with the bottom of the lower shell, the area opposite to the side surface of the lower shell is larger, so that the lower shell gap at the side surface of the lower shell is relatively larger, more heat preservation layers can be filled, and better heat preservation is realized.

Preferably, the insulating layer comprises one of an aerogel layer and a foaming material layer, or the insulating layer is composed of an aerogel layer and a foaming material layer.

Example 10: in this embodiment, when the aerogel layer and the foaming material layer are connected in the arrangement, the aerogel layer is connected with one of the lower outer shell and the lower inner shell, or the aerogel layer is connected with the lower outer shell and the lower inner shell simultaneously, and the connection mode includes adhesive connection or high-temperature fusion connection formed by means of the shell; and when the foaming material layers are connected, the foaming material layers are filled into the gaps of the lower shell in a filling foaming mode.

The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.

Claims (10)

1. A lower case of a battery pack, characterized in that: including the shell and the lower inner shell of mutually overlapping, shell and lower inner shell all adopt non-metal composite to make down, lower inner shell include down the inner shell body with set up in the shell lateral wall additional strengthening in the edge outside of lower inner shell body down, the edge of shell with shell lateral wall additional strengthening down is connected.

2. The lower case of a battery pack according to claim 1, wherein: the lower shell side wall reinforcing structure comprises a plurality of lower shell reinforcing vertical plates which extend outwards along the direction perpendicular to the side wall of the lower inner shell body, and the extending direction of the lower shell reinforcing vertical plates is perpendicular to the extending direction of the lower shell reinforcing transverse plates;

and/or the lower shell side wall reinforcing structure comprises lower shell reinforcing transverse plates connected with the distal ends of the lower shell reinforcing vertical plates respectively, and the extending direction of the lower shell reinforcing transverse plates is parallel to the extending direction of the side wall of the lower inner shell body;

the edge of the lower shell is connected with the lower shell reinforcing transverse plate, and preferably, the edge of the lower shell is connected with the lower shell reinforcing transverse plate in a staggered or connected mode.

3. The lower case of a battery pack according to claim 2, wherein: each lower shell reinforcing vertical plate is connected with a plurality of lower shell reinforcing transverse plates; a plurality of lower shell reinforcing transverse plates at the lower shell reinforcing vertical plates are arranged at intervals; and/or a plurality of lower shell reinforcing transverse plates at each lower shell reinforcing vertical plate are mutually parallel.

4. A lower case of a battery pack according to any one of claims 1 to 3, wherein: the edge of the lower outer shell is integrally connected with the lower shell side wall reinforcing structure, and/or the thickness of the lower inner shell is larger than that of the lower outer shell;

and/or a lower shell gap is arranged between the lower outer shell and the lower inner shell, and the lower shell gap is filled with an insulating layer;

preferably, the pitch of the lower case gap at the lower case side face is larger than the pitch of the lower case gap at the lower case bottom.

5. A lower case of a battery pack according to any one of claims 1 to 3, wherein: the lower shell side wall reinforcing structure is provided with a flange surface extending horizontally outwards; the flange surface is provided with a lower shell mounting hole extending downwards, the lower shell mounting hole is used for connecting a connecting piece to fix the lower shell, and the lower shell mounting hole is connected with the side wall of the lower inner shell body through reinforcing ribs arranged at intervals; alternatively, the flange face is crimped to fix the lower case.

6. A lower case of a battery pack according to any one of claims 1 to 3, wherein the lower inner case further comprises a sealing groove provided outside an edge of the lower inner case body, the sealing groove being for accommodating a sealing strip for sealing in cooperation with the lower case and an upper cover;

preferably, in the vertical height direction, the lower shell side wall reinforcing structure is located below the seal groove; and/or, in the horizontal direction, the outer side surface of the lower shell side wall reinforcing structure protrudes out of the outer side surface of the sealing groove;

and/or, be equipped with the buckle riser on the lateral wall of lower inner shell body, be equipped with the buckle on the buckle riser, the buckle lock is to setting up in the knot hole of upper cover.

7. The lower case of a battery pack according to claim 1, wherein a plurality of first concave portions are formed at intervals in a circumferential direction on a side wall of the lower case, and convex portions protruding from the first concave portions are formed adjacent to the first concave portions;

and/or, the lower inner shell is provided with vertical rib plates, the vertical rib plates are positioned at the side parts of the first concave part and the convex part, and filling gaps are formed between the vertical rib plates and the side walls of the lower outer shell;

preferably, a chamfer structure is formed at the bottom of the vertical rib plate.

8. The lower case of a battery pack according to claim 1, wherein the lower inner case further comprises an inner reinforcing structure provided at an inner side of the lower inner case body, the inner reinforcing structure comprising an inner reinforcing plate connected to an inner wall of the lower inner case in a width direction of the lower inner case body;

and/or, the inner reinforcement structure further includes an inner case step provided at the bottom edge of the lower inner case body and contracted inward, the inner case step being for supporting the battery module put into the lower inner case body;

the bottom edge of the lower outer shell body is provided with an inward-shrinking step matched with the bottom edge of the lower inner shell, and a concave matched with the edge bulge of the upper cover is formed at the step.

9. A thermal insulation battery pack, characterized in that: a lower case comprising the battery pack according to any one of claims 1 to 8, the insulated battery pack further comprising an upper cover that is interfitted with the lower case, the upper cover being made of a non-metallic composite material.

10. The battery pack assembly is characterized by comprising an outer container, a plurality of battery pack placement areas are arranged in the outer container in a separated mode, standard pack components are arranged in the battery pack placement areas, each standard pack component comprises at least two heat-preservation battery packs according to claim 9, and the heat-preservation battery packs are stacked with each other along the vertical direction.