CN220627961U - Battery pack box and battery pack with same - Google Patents

Abstract

The utility model discloses a battery pack box body and a battery pack with the same, wherein the battery pack box body comprises: the lower shell comprises an outer frame, a cross beam and a bottom guard plate, wherein the bottom guard plate is connected with the bottom of the outer frame, a containing cavity is defined by the bottom guard plate and the outer frame in a matched mode, the cross beam extends along a first direction in a horizontal plane, and the cross beam is arranged in the containing cavity and is connected with the outer frame; the heat preservation assembly covers the side wall and the bottom wall of the accommodating cavity and the two side surfaces of the cross beam in the second direction in the horizontal plane, and the first direction is perpendicular to the second direction. According to the battery pack box body, the lower shell and the heat preservation assembly are arranged, and the heat preservation assembly covers the side wall, the bottom wall and the two side surfaces of the cross beam in the second direction in the horizontal plane of the accommodating cavity, so that the battery pack box body can have a good heat preservation effect under the condition of meeting the mechanical property requirement.

Description

Battery pack box and battery pack with same

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery pack box body and a battery pack with the same.

Background

The change of natural environment often affects the development and innovation of various fields in various aspects of human society, and as such, various industries continuously improve the lifting technology and continuously innovate and break through to solve or bypass the negative effects caused by the natural environment. The cruising ability of the power battery is closely related to the ambient temperature, the cruising ability of the power battery is poor at low temperature, which is an important factor for limiting the development of the power battery, especially in the extremely cold winter environment in northern areas, the cruising mileage of the power battery is greatly discounted, and the battery is charged at low temperature, so that serious potential safety hazard exists. At present, a battery pack often adopts a composite material box body with low heat conductivity coefficient or a box body structure formed by combining composite materials and a metal frame for heat preservation, and the performance requirement of the battery pack is difficult to consider.

Disclosure of Invention

The present utility model has been made based on the findings of the inventors of the present application regarding the following facts and problems:

at present, a battery pack adopting a composite material box body has the problem of insufficient mechanical strength, so that the working condition requirements of vibration, impact and the like of the battery pack are difficult to meet the requirements, and the mode of combining the composite material and a metal frame also has the problem of vibration layering, so that the mechanical performance and good heat preservation performance of the battery pack are difficult to be compatible.

The present utility model aims to solve at least one of the technical problems existing in the prior art. The utility model is based on the object of providing a battery pack housing which has a good thermal insulation effect while maintaining good mechanical properties.

The utility model further provides a battery pack with the battery pack box body.

The battery pack case according to the first aspect of the present utility model includes: the lower shell comprises an outer frame, a cross beam and a bottom guard plate, wherein the bottom guard plate is connected with the bottom of the outer frame, a containing cavity is defined by the bottom guard plate and the outer frame in a matched mode, the cross beam extends along a first direction in a horizontal plane, and the cross beam is arranged in the containing cavity and is connected with the outer frame; the heat preservation assembly covers the side wall and the bottom wall of the accommodating cavity and the two side surfaces of the cross beam in the second direction in the horizontal plane, and the first direction is perpendicular to the second direction.

According to the battery pack box body, the lower shell and the heat preservation assembly are arranged, and the heat preservation assembly covers the side wall, the bottom wall and the two side surfaces of the cross beam in the second direction in the horizontal plane of the accommodating cavity, so that the battery pack box body can have a good heat preservation effect under the condition of meeting the mechanical property requirement.

In addition, the battery pack case according to the present utility model may have the following additional technical features:

in some embodiments of the utility model, the insulation assembly comprises: the first heat preservation plate is arranged on the inner side surface of the outer frame facing the accommodating cavity; the second heat insulation plates are arranged on the two side surfaces of the cross beam in the second direction; and the third heat insulation plate is arranged on the upper side surface of the bottom guard plate.

In one embodiment of the utility model, the lower housing further comprises a bottom plate, the bottom plate is arranged in the accommodating cavity and is positioned on the upper side of the bottom guard plate, and the third heat insulation plate is arranged between the bottom plate and the bottom guard plate.

In some examples of the present utility model, the lower end of the outer frame has a supporting edge extending toward the inside of the accommodating cavity, the lower housing further includes a supporting member, the bottom plate is supported on the supporting edge by the supporting member, the supporting member is annular, the supporting member is matched with the outer frame to form a first heat-preserving cavity, and the inner side wall of the supporting member is matched with a second heat-preserving cavity.

In one example of the present utility model, the third insulation board includes a first insulation part, and the first insulation part is disposed in the first insulation cavity; the second heat preservation cavity is a cavity, or the third heat preservation plate comprises a second heat preservation part, and the second heat preservation part is arranged in the second heat preservation cavity.

In one embodiment of the present utility model, the first heat-preserving portion is a foam rubber member, and the first heat-preserving portion is formed in the first heat-preserving cavity in a foaming manner.

In a specific example of the present utility model, a gap is provided between the support and the base plate in the up-down direction, and a portion of the first heat insulating portion is filled between the support and the base plate.

In one embodiment of the utility model, the thickness of the first insulation board is 2mm-10mm, the thickness of the second insulation board is 2mm-15mm, and the thickness of the third insulation board is 5mm-15mm.

In some embodiments of the utility model, the insulation assembly is adhesively attached to the lower housing.

The battery pack according to the second aspect of the present utility model includes the battery pack case according to the first aspect of the present utility model.

According to the battery pack disclosed by the utility model, the battery pack box body in the first aspect is arranged, and the lower shell and the heat insulation assembly are arranged, so that the heat insulation assembly covers the side wall, the bottom wall and the two side surfaces of the cross beam in the second direction in the horizontal plane, and the battery pack box body can have a good heat insulation effect under the condition of meeting the mechanical property requirement.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

Fig. 1 is an exploded view of a battery pack case according to an embodiment of the present utility model;

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

fig. 3 is a schematic view of another angle of a battery pack case according to an embodiment of the present utility model;

fig. 4 is a schematic view of a battery pack case according to an embodiment of the present utility model at still another angle;

fig. 5 is a schematic view of still another angle of a battery pack case according to an embodiment of the present utility model;

FIG. 6 is a cross-sectional view at A-A shown in FIG. 5;

fig. 7 is a schematic view of still another angle of a battery pack case according to an embodiment of the present utility model;

FIG. 8 is a cross-sectional view at B-B shown in FIG. 7;

FIG. 9 is a partially enlarged schematic illustration at C shown in FIG. 8;

fig. 10 is an exploded view of a third insulation board and a support in a battery pack case according to an embodiment of the present utility model;

fig. 11 is a schematic view of a third insulation board and a support in a battery pack case according to an embodiment of the present utility model;

fig. 12 is a schematic view of another angle of the third insulation board and the support in the battery pack case according to the embodiment of the present utility model;

fig. 13 is a schematic view of a third insulation board and a support in a battery pack case according to an embodiment of the present utility model at still another angle;

fig. 14 is a sectional view at D-D shown in fig. 13.

Reference numerals:

11. an outer frame; 111. a support edge; 12. a cross beam; 13. a bottom plate; 14. a support; 15. a bottom guard board; 101. a receiving chamber; 102. a glue layer;

21. a first heat-retaining plate; 22. a second insulation board; 23. a third insulation board; 231. a first heat retaining portion; 232. a second heat preservation part;

100. and a battery pack case.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

A battery pack case 100 according to an embodiment of the first aspect of the present utility model is described below with reference to fig. 1 to 14.

As shown in fig. 1 to 14, a battery pack case 100 according to an embodiment of the first aspect of the present utility model includes: the lower shell comprises an outer frame 11, a cross beam 12 and a bottom guard plate 15, the bottom guard plate 15 is connected with the bottom of the outer frame 11, the bottom guard plate 15 and the outer frame 11 are matched to define a containing cavity 101, the cross beam 12 extends along a first direction (left-right direction as shown in fig. 2) in a horizontal plane, and the cross beam 12 is arranged in the containing cavity 101 and is connected with the outer frame 11; the insulation assembly covers both side surfaces of the side walls and the bottom wall of the accommodating chamber 101 and the cross member 12 in a second direction (front-rear direction as shown in fig. 1) in the horizontal plane, the first direction being perpendicular to the second direction.

It can be understood that in the low-temperature environment, heat in the battery pack is easy to be dissipated outside the battery pack through the box body structure of the battery pack, the mechanical connecting component and other structures, so that the temperature of the battery cell is low during charging and discharging, the battery cell is difficult to charge and discharge, the discharge capacity is low, the overall power supply capacity of the battery pack is reduced, and the cruising ability of the battery pack is reduced.

In this embodiment, the battery pack case 100 includes a lower housing and a thermal insulation assembly, the bottom protection plate 15 and the outer frame 11 cooperate to define the accommodating cavity 101, in actual use, a battery module formed by a plurality of battery cells of the battery pack or a plurality of battery cells can be assembled and arranged in the accommodating cavity 101, and when the battery pack is used, heat in the battery pack can be transferred to the outside of the battery pack through the bottom protection plate 15, the outer frame 11 and the cross beams 12 of the battery pack case 100. This embodiment sets up the heat preservation assembly, and the heat preservation assembly is holding the lateral wall, diapire and the crossbeam 12 of chamber 101 and is holding the chamber 101 and cover the ascending both sides surface in the second direction in the horizontal plane to can be effectively with frame 11, end backplate 15 and crossbeam 12 with hold the cavity of chamber 101 isolated reliably, make the temperature that holds the chamber 101 be difficult to outwards give off through frame 11, end backplate 15 and crossbeam 12, and then play heat retaining effect, make battery package box 100 have good heat preservation effect.

Referring to fig. 1 and 3, the heat insulation assembly covers the two side surfaces of the beam 12 in the second direction in the horizontal plane, that is, the heat insulation assembly covers the two sides of the beam 12 in the thickness direction, because the beam 12 is arranged in the accommodating cavity 101, the heat in the accommodating cavity 101 is easily transferred to the outer frame 11 connected with the beam 12 through the two side surfaces of the beam 12 in the thickness direction, and further is emitted to the outside of the battery pack case 100, and the heat insulation assembly covers the two sides of the beam 12 in the thickness direction, so that the heat is well isolated from being transferred to the beam 12, thereby further improving the heat insulation effect of the battery pack case 100.

It can be appreciated that, in this embodiment, the battery pack case 100 has a good heat insulation effect by setting the heat insulation assembly in the accommodating cavity 101, and the heat insulation assembly reliably and effectively insulates the structure of the outer frame 11, the cross beam 12 and the bottom guard plate 15 in the lower casing from the accommodating cavity 101, so that the lower casing in the battery pack case 100 does not need to additionally consider the realization of the heat insulation effect during actual processing and production, and thus conventional metal structural members, such as steel plate structural members, aluminum plate structural members, and the like, can be adopted, so that the battery pack case 100 can have good mechanical properties, and thus the performance requirements of the battery pack can be well satisfied.

According to the battery pack case 100 of the embodiment of the utility model, the lower shell and the heat insulation assembly are arranged, and the heat insulation assembly covers the side wall and the bottom wall of the accommodating cavity 101 and the two side surfaces of the cross beam 12 in the second direction in the horizontal plane, so that the battery pack case 100 can have a good heat insulation effect under the condition of meeting the mechanical performance requirement.

In some embodiments of the present utility model, as shown in fig. 1, the insulation assembly may include: a first heat-insulating plate 21, a second heat-insulating plate 22 and a third heat-insulating plate 23, the first heat-insulating plate 21 being provided on an inner side surface of the outer frame 11 facing the accommodating chamber 101; the second heat-insulating plates 22 are arranged on the two side surfaces of the cross beam 12 in the second direction; the third insulation board 23 is provided on the upper side surface of the bottom guard 15.

The heat insulation assembly is provided with the first heat insulation plate 21 on the side wall of the accommodating cavity 101, so that the accommodating cavity 101 and the outer frame 11 are insulated and insulated, heat can be well prevented from being emitted out of the battery pack box body 100 from the outer frame 11, and a heat insulation effect is achieved on the battery pack box body 100; the heat insulation assembly is provided with the second heat insulation plates 22 on the two side surfaces of the cross beam 12 in the second direction, the accommodating cavity 101 and the cross beam 12 are insulated and insulated, heat can be well prevented from being transferred from the cross beam 12 to the outer frame 11 and then emitted out of the battery pack box body 100, direct contact and heat transfer between the battery monomer and the cross beam 12 are avoided, further heat insulation effect is achieved on the battery pack box body 100, and the heat insulation effect of the battery pack box body 100 is further improved; the heat preservation assembly sets up third heated board 23 at the upside surface of backplate 15 at the bottom, to holding chamber 101 and backplate 15 at the bottom isolated heat preservation, can avoid well that heat from holding the bottom of chamber 101 and distribute outside battery package box 100 through backplate 15 to play further heat preservation effect to battery package box 100, further promote the heat preservation effect of battery package box 100.

In this embodiment, the insulation assembly insulates and insulates the accommodating cavity 101, the outer frame 11, the cross beam 12 and the bottom guard plate 15 by arranging the first insulation plate 21, the second insulation plate 22 and the third insulation plate 23, so that the insulation assembly has a relatively reliable and effective insulation effect, the battery pack box body 100 has a good insulation effect, and the first insulation plate 21, the second insulation plate 22 and the third insulation plate 23 are simple in structure and convenient to assemble, and are convenient to process and assemble the battery pack box body 100.

In some examples of the utility model, both the first thermal insulation plate 21 and the second thermal insulation plate 22 may be pieces of thermal insulation material. For example, the first thermal insulation board 21 and the second thermal insulation board 22 may be formed by one or more of polyurethane foam, vacuum insulation panels, aerogel, polypropylene foam, etc., and the first thermal insulation board 21 and the second thermal insulation board 22 may have an extremely low thermal conductivity of less than 0.01W/m·k, so that the thermal insulation assembly has a good thermal insulation effect, and thus the battery pack case 100 has a better thermal insulation effect.

In one embodiment of the present utility model, as shown in fig. 6 and 10, the lower housing may further include a bottom plate 13, the bottom plate 13 being disposed in the receiving chamber 101 and located at an upper side of the bottom shielding plate 15, and a third insulation plate 23 being disposed between the bottom plate 13 and the bottom shielding plate 15.

In this embodiment, the lower casing is provided with the bottom plate 13, and the bottom plate 13 sets up in the upside of third heated board 23, and when the battery package was assembled, a plurality of battery modules or a plurality of battery monomer assembly in the battery package was held in chamber 101, and bottom plate 13 can play fine fixed effect of support to a plurality of battery modules or a plurality of battery monomer, and support stability is better, makes the fixed effect of support of battery package box 100 better.

The bottom plate 13 sets up in the upside of third heated board 23, and third heated board 23 can play isolated heat retaining effect to bottom plate 13, makes the battery package when the operation, and the heat that a plurality of battery monomers or a plurality of battery monomers produced in a plurality of battery modules in the battery package and the heat in the battery package internal chamber 101 can not transmit to in the backplate 15 and give off outside the battery package box 100 through bottom plate 13 to make the heat preservation effect of battery package box 100 better.

In one embodiment of the present utility model, the bottom plate 13 may be a steel plate, an aluminum plate, or a composite plate. This gives the base 13 good structural strength and thus better support and fixation of the base 13. Optionally, when the bottom plate 13 is a composite plate, the thermal conductivity coefficient of the composite plate is less than or equal to 0.5W/m·k, so that the heat transfer and heat conduction capability of the bottom plate 13 can be reduced to a certain extent, and the heat preservation effect of the battery pack case 100 is further improved. Of course, other material pieces can be selected for the bottom plate 13 according to the requirement, and the heat insulation requirement of the battery pack box 100 and the supporting requirement of the bottom plate 13 can be met.

In some examples of the utility model, the thickness of the base 13 may be 3mm-10mm. Therefore, the bottom plate 13 has enough structural strength, so that the battery module or the battery monomer is supported and fixed more stably and reliably, and meanwhile, the influence on the energy density of the battery pack caused by the large occupation of the bottom plate 13 to the accommodating cavity 101 can be avoided better. For example, the thickness of the base 13 may be 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc. Preferably, the thickness of the bottom plate 13 is 3mm.

In one embodiment of the present utility model, referring to fig. 9, there is a gap between the bottom plate 13 and the outer frame 11. Therefore, heat can be prevented from being directly transferred to the outer frame 11 through the bottom plate 13 and further dissipated to the outside of the battery pack box 100, and the heat preservation effect of the battery pack box 100 is further improved.

In one embodiment of the utility model, the cross member 12 and the base plate 13 may be adhesively connected. Referring to fig. 1, an adhesive layer 102 is arranged between the beam 12 and the bottom plate 13, and the beam 12 and the bottom plate 13 are connected by adhesive through the adhesive layer 102, so that the structure is simple and the connection is convenient. Further, the glue layer 102 may be a heat-insulating potting adhesive, so that the heat insulation effect on the cross beam 12 and the bottom plate 13 can be achieved to a certain extent, and heat transfer between the bottom plate 13 and the cross beam 12 is reduced, so that heat flow in the accommodating cavity 101 is more stable, and the battery pack box 100 has a better heat insulation effect.

In some examples of the present utility model, as shown in fig. 6 to 10, the lower end of the outer frame 11 may have a supporting edge 111 extending toward the inside of the accommodating cavity 101, the lower housing may further include a supporting member 14, the bottom plate 13 is supported on the supporting edge 111 by the supporting member 14, the supporting member 14 is in a ring shape, the supporting member 14 cooperates with the outer frame 11 to enclose a first insulation cavity, and the inner side of the supporting member 14 encloses a second insulation cavity.

The lower extreme of frame 11 is formed with supporting edge 111 towards holding the extension in the chamber 101, and bottom plate 13 passes through support piece 14 and supports on supporting edge 111, because the overall structure intensity of frame 11 is better, can play comparatively firm stable supporting role to bottom plate 13 through support piece 14 to make the support electric module that bottom plate 13 can be better after the assembly or a plurality of battery monomer, simple structure, fixed convenience.

The supporting piece 14 is provided in a ring shape, and referring to fig. 10, the bottom plate 13 can be supported more stably and reliably, and meanwhile, the contact surface with the bottom plate 13 can be reduced to a certain extent, so that the heat transfer between the bottom plate 13 and the supporting piece 14 is reduced, and the heat in the battery pack box 100 is further reduced, and is transferred to the outer frame 11 through the supporting piece 14 and the supporting edge 111 to be dispersed, so that the heat preservation effect of the battery pack is further improved.

The supporting piece 14 encloses a first heat-preserving cavity with the outer frame 11 in a matching way, specifically, the supporting piece 14 encloses a first heat-preserving cavity with the supporting edge 111 of the outer frame 11 and the bottom plate 13 in a matching way, the inner side of the supporting piece 14 encloses a second heat-preserving cavity, specifically, the supporting piece 14 encloses a second heat-preserving cavity with the bottom guard plate 15, the supporting edge 111 of the outer frame 11 and the bottom plate 13 in a matching way. According to the embodiment, the first heat preservation cavity and the second heat preservation cavity are formed between the bottom plate 13 and the bottom guard plate 15, so that the heat transfer distance between the bottom plate 13 and the bottom guard plate 15 can be increased to a certain extent, heat generated by a plurality of battery modules or a plurality of battery monomers supported on the bottom plate 13 during operation can be well reserved in the accommodating cavity 101 after being transferred from the bottom plate 13, heat dissipation to the outside of the battery pack box body 100 through the bottom guard plate 15 at the bottom of the accommodating cavity 101 is further reduced, and therefore the heat preservation effect of the battery pack box body 100 is better.

In one example of the utility model, the support 14 may be a plastic or metal piece. The support piece 14 is a plastic piece or a metal piece, so that the structure is simple, and the support effect is good. Further, the thermal conductivity of the supporting member 14 is smaller than 0.4W/m·k, so that the heat transfer capability of the supporting member 14 can be further reduced, and the heat transfer from the bottom plate 13 to the bottom guard plate 15 through the supporting member 14 is reduced, so that the heat is emitted to the outside of the battery pack case 100, and the battery pack case 100 has a better heat preservation effect.

In one example of the present utility model, as shown in fig. 1 and 10, the third insulation board 23 may include a first insulation part 231, the first insulation part 231 being provided in the first insulation chamber; the second heat-preserving cavity is a cavity, or the third heat-preserving plate 23 comprises a second heat-preserving part 232, and the second heat-preserving part 232 is arranged in the second heat-preserving cavity.

In this embodiment, the third insulation board 23 is provided with a first insulation part 231 disposed in the first insulation cavity, as shown in fig. 9, the first insulation cavity is formed by enclosing the outer frame 11, the supporting member 14 and the bottom plate 13, and the first insulation part 231 is disposed in the first insulation cavity, so that a good filling effect can be achieved, a good heat insulation effect is achieved on the accommodating cavity 101, the outer frame 11 and the supporting member 14, and heat is prevented from being emitted from the supporting edge 111 of the outer frame 11 and the supporting member 14 to the outside of the battery pack box 100, so that the insulation effect of the battery pack box 100 is better.

The first heat preservation chamber is internally provided with the first heat preservation part 231, so that the outer frame 11, the bottom plate 13 and the supporting piece 14 can be assembled and connected more stably and reliably to a certain extent, and meanwhile, the heat convection of the gas in the accommodating chamber 101 at the first heat preservation chamber can be avoided, so that the heat preservation effect of the battery pack box body 100 is further improved.

In this embodiment, the second heat-preserving cavity may be a cavity, and the second heat-preserving portion 232 may be disposed in the second heat-preserving cavity. The second heat preservation part 232 is not arranged in the second heat preservation cavity, so that the processing cost of the third heat preservation plate 23 can be reduced, and the cost of the battery pack is reduced to a certain extent. The second heat preservation portion 232 is arranged in the second heat preservation cavity, the second heat preservation portion 232 can play a good role in heat insulation and preservation for the bottom plate 13 and the bottom guard plate 15, heat in the accommodating cavity 101 is better prevented from being transferred to the bottom guard plate 15 through gas convection, and then the heat is emitted from the bottom guard plate 15, and therefore the heat preservation effect of the battery pack box body 100 is further improved.

In an embodiment of the present utility model, the first heat preservation portion 231 may be a foam plastic member, and the first heat preservation portion 231 is formed in the first heat preservation cavity in a foaming manner.

In this embodiment, the first heat preservation portion 231 is set to be a foam rubber member, when the support member 14 is assembled with the outer frame 11 and the bottom plate 13, the foam rubber member can be injected into the first heat preservation cavity to be foamed, so that the foam rubber member can be filled in the first heat preservation cavity, and thus, the good filling sealing and heat insulation effects can be achieved on the support edge 111 of the frame at the first heat preservation cavity, the bottom guard plate 15 and the support member 14, and the foam rubber member has a certain bonding strength, the foam rubber member can be used for connecting and fixing the frame, the support member 14 and the bottom plate 13, so that the bottom plate 13, the support member 14 and the support edge 111 of the outer frame 11 are connected and fixed more stably and firmly, when the support member 14 and the outer frame 11 are connected and fixed, the use of metal connecting members and the setting of the sealing glue layer 102 can be reduced or avoided, the cost can be reduced to a certain extent, and simultaneously, the reduction of the metal connecting members can further reduce the heat transfer between the bottom plate 13, the support member 14 and the outer frame 11, and the heat insulation effect of the battery pack box 100 can be further improved. For example, the first heat preservation part 231 may be a polyurethane foam member.

In one embodiment of the present utility model, the second insulation part 232 may be a vacuum insulation panel or a prefabricated polyurethane foam member. Therefore, the second heat preservation part 232 has good heat insulation effect, meanwhile, the second heat preservation part 232 can be matched with the first heat preservation part 231 to connect and fix the supporting piece 14 with the bottom plate 13, the outer frame 11 and the bottom guard plate 15, so that the bottom plate 13 can be firmly and stably supported and fixed on the supporting piece 14 and the third heat preservation plate 23, and the situation that the battery monomer is out of control due to the fact that the bottom plate 13 is not firmly fixed and shifts is effectively avoided, and the safety of the battery pack is better.

In a specific example of the present utility model, as shown in fig. 9, there may be a gap between the support 14 and the bottom plate 13 in the up-down direction, and a portion of the first heat preservation part 231 is filled between the support 14 and the bottom plate 13.

The gap is formed between the supporting member 14 and the bottom plate 13, and the portion of the first heat preservation portion 231 is filled in the gap, so that the contact area between the bottom plate 13 and the supporting member 14 can be further reduced, and heat transfer between the bottom plate 13 and the supporting member 14 is reduced, so that the heat preservation effect of the battery pack case 100 is further improved. Alternatively, referring to fig. 9, a recess communicating with the first heat-preserving chamber is formed at an end of the supporting member 14 facing the bottom plate 13, and the supporting member 14 is abutted to the bottom plate 13 through a small contact surface, so that the bottom plate 13 can be stably fixed on the supporting member 14.

In one embodiment of the present utility model, the thickness of the first thermal insulation board 21 may be 2mm to 10mm, the thickness of the second thermal insulation board 22 may be 2mm to 15mm, and the thickness of the third thermal insulation board 23 may be 5mm to 15mm.

In this embodiment, the thickness of the first heat-preserving plate 21 is limited, so that the first heat-preserving plate 21 has good heat-insulating effect, and meanwhile, adverse effects on the energy density of the battery pack caused by excessive occupation of the space of the accommodating cavity 101 due to excessive thickness of the first heat-preserving plate 21 can be avoided. For example, the thickness of the first thermal insulation board 21 may be 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc. Preferably, the thickness of the first insulation board 21 is 5mm.

In this embodiment, the thickness of the second insulation board 22 is limited, so that the second insulation board 22 has a good heat insulation effect, and meanwhile, the adverse effect on the energy density of the battery pack caused by too much occupation of the space of the accommodating cavity 101 due to the too thick second insulation board 22 can be avoided. For example, the thickness of the second thermal insulation plate 22 may be 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, etc.

Alternatively, the thickness of the second insulation board 22 at the beam 12 distant from the outer frame 11 in the second direction may be 2mm to 10mm, the thickness of the second insulation board 22 at the beam 12 near the outer frame 11 in the second direction may be 5mm to 15mm, and the thickness of the second insulation board 22 at the beam 12 distant from the outer frame 11 may be smaller than the thickness of the second insulation board 22 at the beam 12 near the outer frame 11. It will be appreciated that when the battery pack is in use, the plurality of battery cells in the battery pack generate heat, and in general, heat dissipation measures need to be taken for the battery pack, and when the ambient temperature is low, the heat between the plurality of battery cells or between the plurality of battery modules is high, so that the thickness of the second heat insulation board 22 at the position of the cross beam 12 far away from the outer frame 11 is set to be thinner, and the effect of good heat insulation and heat preservation can be achieved by matching with the heat generated by the battery modules or the battery cells.

For example, the thickness of the second insulation board 22 at the beam 12 distant from the outer frame 11 in the second direction may be 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc., and the thickness of the second insulation board 22 at the beam 12 near the outer frame 11 in the second direction may be 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, etc. Preferably, the thickness of the second insulation board 22 at the beam 12 distant from the outer frame 11 in the second direction is 5mm, and the thickness of the second insulation board 22 at the beam 12 near the outer frame 11 in the second direction is 7mm.

In this embodiment, the thickness of the third insulation board 23 is limited, so that the third insulation board 23 has a good heat insulation effect, and meanwhile, the adverse effect on the energy density of the battery pack caused by too much occupation of the space of the accommodating cavity 101 due to the excessively thick third insulation board 23 can be avoided. For example, the thickness of the third thermal insulation plate 23 may be 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, etc. Preferably, the thickness of the second insulation 232 in the third insulation board 23 may be 15mm.

In some embodiments of the utility model, the insulation assembly may be adhesively attached to the lower housing, as shown with reference to FIG. 3. Therefore, the heat preservation assembly and the lower shell are connected and fixed conveniently and tightly, and the heat preservation assembly can be better attached to the lower shell through bonding for heat insulation and heat preservation, and the heat preservation device is simple in structure and convenient to connect.

In some embodiments of the present utility model, as shown with reference to fig. 5-9, the outer frame 11 is removably attached to the bottom shield 15. The outer frame 11 and the bottom guard plate 15 are detachably connected, so that the structure is simple, and the assembly and the disassembly are convenient. For example, the bottom guard 15 and the outer frame 11 may be fixedly connected by bolting, riveting, or the like.

In one embodiment of the present utility model, the bottom guard plate 15 may be a steel plate, an aluminum plate, or a composite plate. This provides the base 13 with good structural strength and impact and ball impact resistance, thereby providing better safety and reliability of the battery pack case 100.

A battery pack according to an embodiment of the second aspect of the present utility model is described below with reference to fig. 1 to 14.

As shown in fig. 1 to 14, the battery pack according to the second aspect of the embodiment of the present utility model includes the battery pack case 100 according to the above-described first aspect of the embodiment of the present utility model.

Other constructions and operations of the battery pack according to the embodiment of the present utility model are known to those of ordinary skill in the art, and will not be described in detail herein.

According to the battery pack of the embodiment of the utility model, by arranging the battery pack case 100 of the first aspect, and by arranging the lower shell and the heat insulation assembly, the heat insulation assembly covers the side wall and the bottom wall of the accommodating cavity 101 and the two side surfaces of the cross beam 12 in the second direction in the horizontal plane, so that the battery pack case 100 can have a good heat insulation effect under the condition of meeting the mechanical performance requirement.

A battery pack according to an embodiment of the present utility model is described below with reference to fig. 1 to 14.

As shown in fig. 1 to 14, the battery pack includes a battery pack case 100, and the battery pack case 100 is used to house a battery module, a battery cell, various electric parts, and the like of the battery pack.

The battery pack box 100 comprises a lower shell and a heat preservation assembly, wherein the heat preservation assembly is used for carrying out heat insulation and heat preservation on the battery pack box 100. The lower shell comprises an outer frame 11, a cross beam 12, a bottom plate 13, supporting pieces 14 and a bottom guard plate 15, wherein the outer frame 11 and the bottom guard plate 15 are matched to define a containing cavity 101, the cross beam 12 is provided with three supporting pieces and is arranged in the containing cavity 101 at intervals along the front-back direction, the cross beam 12 extends along the left-right direction and two ends of the cross beam are respectively connected and fixed with the outer frame 11, the bottom of the outer frame 11 is provided with a supporting edge 111 extending towards the containing cavity 101, the bottom guard plate 15 is arranged at the bottom of the outer frame 11 and is fixed with the outer frame 11 through bolts, the supporting pieces 14 are rectangular frames, the supporting pieces 14 are arranged on the supporting edge 111, positioning protrusions are formed on the supporting edge 111, the supporting pieces 14 are correspondingly formed with positioning grooves, the positioning grooves of the supporting pieces 14 are matched with the positioning protrusions, the bottom plate 13 is supported on the supporting pieces 14 and is provided with gaps with the inner side walls of the outer frame 11, the supporting pieces 14 are combined with the bottom plate 13 and the outer frame 11 in a surrounding mode to form a first heat preservation cavity, the inner side of the supporting pieces 14 are combined with the bottom plate 13 and the bottom guard plate 15 in a surrounding mode to form a second heat preservation cavity, and the upper end of the supporting pieces 14 are formed with grooves communicated with the first heat preservation cavity.

The insulation assembly comprises a first insulation board 21, a second insulation board 22 and a third insulation board 23. The first thermal insulation board 21 covers on the side peripheral wall of the outer frame 11, the second thermal insulation board 22 covers on both sides of the thickness direction of the cross beam 12, the third thermal insulation board 23 comprises a first thermal insulation part 231 and a second thermal insulation part 232, the first thermal insulation part 231 is filled in the first thermal insulation cavity and the groove, and the second thermal insulation part 232 is arranged in the second thermal insulation cavity.

During assembly, the first heat-insulating plate 21 and the second heat-insulating plate 22 are respectively connected with the outer frame 11 and the cross beam 12 in an adhering manner, the second heat-insulating part 232 is fixed in the second heat-insulating cavity, the supporting frame, the bottom guard plate 15 and the outer frame 11 are assembled, the bottom plate 13 is supported and fixed on the supporting frame, and the first heat-insulating part 231 is formed by injecting polyurethane foam glue into the first heat-insulating cavity from a gap between the bottom plate 13 and the outer frame 11 for foaming and filling.

According to the battery pack of the embodiment of the utility model, by arranging the battery pack case 100 of the first aspect, and by arranging the lower shell and the heat insulation assembly, the heat insulation assembly covers the side wall and the bottom wall of the accommodating cavity 101 and the two side surfaces of the cross beam 12 in the second direction in the horizontal plane, so that the battery pack case 100 can have a good heat insulation effect under the condition of meeting the mechanical performance requirement.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A battery pack case, comprising:

the lower shell comprises an outer frame, a cross beam and a bottom guard plate, wherein the bottom guard plate is connected with the bottom of the outer frame, a containing cavity is defined by the bottom guard plate and the outer frame in a matched mode, the cross beam extends along a first direction in a horizontal plane, and the cross beam is arranged in the containing cavity and is connected with the outer frame;

the heat preservation assembly covers the side wall and the bottom wall of the accommodating cavity and the two side surfaces of the cross beam in the second direction in the horizontal plane, and the first direction is perpendicular to the second direction.

2. The battery pack of claim 1, wherein the insulating assembly comprises:

the first heat preservation plate is arranged on the inner side surface of the outer frame facing the accommodating cavity;

the second heat insulation plates are arranged on the two side surfaces of the cross beam in the second direction;

and the third heat insulation plate is arranged on the upper side surface of the bottom guard plate.

3. The battery pack case according to claim 2, wherein the lower case further comprises a bottom plate provided in the accommodation chamber and located on an upper side of the bottom plate, and the third heat-insulating plate is provided between the bottom plate and the bottom plate.

4. The battery pack case according to claim 3, wherein the lower end of the outer frame has a supporting edge extending toward the inside of the accommodating chamber, the lower case further comprises a supporting member, the bottom plate is supported on the supporting edge by the supporting member, the supporting member is ring-shaped, the supporting member is matched with the outer frame to form a first heat-insulating chamber, and the inner side wall of the supporting member is combined with a second heat-insulating chamber.

5. The battery pack case according to claim 4, wherein the third heat-insulating plate includes a first heat-insulating portion provided in the first heat-insulating chamber;

the second heat preservation cavity is a cavity, or the third heat preservation plate comprises a second heat preservation part, and the second heat preservation part is arranged in the second heat preservation cavity.

6. The battery pack case according to claim 5, wherein the first heat retaining portion is a foam molding member, and the first heat retaining portion is foam molded in the first heat retaining chamber.

7. The battery pack case according to claim 6, wherein a gap is provided between the support member and the bottom plate in the up-down direction, and a portion of the first heat retaining portion is filled between the support member and the bottom plate.

8. The battery pack case according to claim 2, wherein the first thermal insulation plate has a thickness of 2mm to 10mm, the second thermal insulation plate has a thickness of 2mm to 15mm, and the third thermal insulation plate has a thickness of 5mm to 15mm.

9. The battery pack of claim 1, wherein the insulation assembly is adhesively attached to the lower housing.

10. A battery pack comprising the battery pack case according to any one of claims 1 to 9.