CN221009112U - Box assembly of battery pack and battery pack with box assembly - Google Patents

Abstract

The utility model discloses a box assembly of a battery pack and the battery pack with the box assembly, wherein the box assembly comprises: a frame enclosing a receiving cavity with both top and bottom open; the bottom plate assembly is arranged at the bottom of the frame to cover the lower opening of the accommodating cavity, and comprises a bottom plate and a bottom guard plate, wherein the bottom guard plate is arranged at the lower side of the bottom plate, an exhaust channel is defined between the bottom plate and the bottom guard plate, and the exhaust channel is communicated with the accommodating cavity; the water cooling plate is arranged at the top of the frame, is connected with the frame and seals the top opening of the accommodating cavity. According to the box assembly of the battery pack, the exhaust channel is formed between the bottom plate and the bottom guard plate, the water cooling plate covers the top opening of the accommodating cavity formed by surrounding the frame, so that the weight of the battery pack can be effectively reduced, the available space of the battery pack can be well improved, the space utilization rate of the battery pack is well improved, and the energy density and the safety of the battery pack are greatly increased.

Description

Box assembly of battery pack and battery pack with box assembly

Technical Field

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

Background

With the continuous progress of society, the living standard of substances in general families is unprecedented improved, so that most laborers in the social group are converted into more non-negligible consumer groups in wide and active social and economic activities, and the improvement and the satisfaction of the substance demands of the consumer groups are not only the necessary conditions for continuous development and perfection of various industries, but also the premise of continuous development and perfection of various industries.

For electric vehicles, the good cruising ability greatly influences the purchase intention of consumer groups, so that the improvement of the cruising ability of the electric vehicles becomes the aim and direction of continuous improvement and development of the electric vehicles, and the requirements of the cruising mileage of the battery pack become higher and higher. In the related art, the battery pack has a heavy weight and space is underutilized, so that it is difficult to further increase the energy density of the battery pack.

Disclosure of utility model

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the box assembly of the battery pack, which can reduce the weight of the battery pack, reasonably utilize the space of the battery pack and well improve the energy density of the battery pack.

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

The case assembly of the battery pack according to the first aspect of the present utility model includes: the frame encloses a containing cavity with the top and the bottom both open; the bottom plate assembly is arranged at the bottom of the frame to cover the lower opening of the accommodating cavity, and comprises a bottom plate and a bottom guard plate, wherein the bottom guard plate is arranged at the lower side of the bottom plate, an exhaust channel is defined between the bottom plate and the bottom guard plate, and the exhaust channel is communicated with the accommodating cavity; the water cooling plate is arranged at the top of the frame, is connected with the frame and seals the top opening of the accommodating cavity.

According to the box assembly of the battery pack, the exhaust channel is formed between the bottom plate and the bottom guard plate, the water cooling plate covers the top opening of the accommodating cavity formed by surrounding the frame, so that the weight of the battery pack can be effectively reduced, the available space of the battery pack can be well improved, the space utilization rate of the battery pack is well improved, and the energy density and the safety of the battery pack are greatly increased.

In some embodiments of the utility model, the exhaust passage extends in a first direction, the floor assembly further comprising: and the sealing parts are arranged on two sides of the exhaust channel in a second direction perpendicular to the first direction, the sealing parts are connected between the bottom plate and the bottom guard plate in a sealing mode, and the sealing parts, the bottom plate and the bottom guard plate are matched to define the exhaust channel.

In one embodiment of the utility model, the seal comprises: the exhaust passage comprises two first sealing parts and two second sealing parts, wherein the first sealing parts extend along the first direction, the two first sealing parts are respectively arranged on two sides of the exhaust passage in the second direction, the second sealing parts are connected between one ends of the two first sealing parts in the first direction, and the other ends of the two first sealing parts in the first direction are spaced to define an exhaust outlet of the exhaust passage.

In some examples of the utility model, the floor assembly further comprises: the protection piece, the protection piece with the bottom plate links to each other, the protection piece is followed the first direction extends, the protection piece covers exhaust passage's exhaust inlet, be formed with the area of weakness on the protection piece, the area of weakness sets up exhaust passage's exhaust inlet with hold between the chamber.

In some embodiments of the utility model, the base plate includes a plurality of sub-plates extending in a first direction and spaced apart in a second direction, adjacent ones of the sub-plates defining an exhaust inlet communicating between the exhaust passage and the receiving cavity.

In some embodiments of the present utility model, the base plate is an integral piece, and the base plate is formed with a plurality of exhaust inlets penetrating the base plate vertically, the plurality of exhaust inlets are arranged at intervals along a first direction, and the exhaust channel is communicated with the accommodating cavity through the plurality of exhaust inlets.

In some embodiments of the utility model, the frame further defines an electrical cavity spaced from the receiving cavity, the floor assembly covers a bottom opening of the electrical cavity, and the housing assembly further includes an access panel disposed at a top of the frame and covering a top opening of the electrical cavity.

In one embodiment of the utility model, the explosion-proof valve is arranged on the frame, and the explosion-proof valve and the electric cavity are respectively arranged on two opposite sides of the frame.

In some embodiments of the utility model, the frame comprises: the longitudinal beams extend along the first direction and are distributed at intervals in the second direction, the transverse beams extend along the second direction and are distributed at intervals in the first direction, and the longitudinal beams and the transverse beams are connected and enclose the accommodating cavity.

The battery pack according to the second aspect of the utility model comprises a plurality of battery cells and the box assembly of the battery pack according to the first aspect of the utility model, wherein the battery cells are arranged in the accommodating cavity.

According to the battery pack disclosed by the utility model, the box body assembly of the battery pack in the first aspect is arranged, the exhaust channel is formed between the bottom plate and the bottom guard plate, the water cooling plate covers the top opening of the accommodating cavity formed by surrounding the frame, so that the weight of the battery pack can be effectively reduced, the available space of the battery pack can be well improved, the space utilization rate of the battery pack can be well improved, and the energy density and the safety of the battery pack can be greatly increased.

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 a schematic view of a battery pack according to an embodiment of the present utility model;

Fig. 2 is a schematic view of another angle of a battery pack according to an embodiment of the present utility model;

fig. 3 is a schematic view of a battery module according to an embodiment of the present utility model;

fig. 4 is a schematic view of a battery cell according to an embodiment of the present utility model;

FIG. 5 is a schematic illustration of a tank assembly according to an embodiment of the present utility model;

FIG. 6 is a schematic view of a bottom shield and seal in accordance with an embodiment of the present utility model;

FIG. 7 is a schematic diagram of a floor assembly according to an embodiment of the utility model;

FIG. 8 is an exploded view of the floor assembly according to FIG. 7;

FIG. 9 is a partial cross-sectional view of a battery cell with a bottom plate, bottom guard plate, seal and guard plate according to an embodiment of the utility model;

FIG. 10 is a schematic view of a floor assembly according to another embodiment of the utility model;

Fig. 11 is a partial cross-sectional view of a battery cell with a bottom plate, a seal, and a protective sheet according to another embodiment of the present utility model.

Reference numerals:

10. a frame; 101. a receiving chamber; 102. an electrical cavity; 103. an exhaust chamber;

11. a cross beam; 12. a longitudinal beam; 13. edge beams;

20. a base plate assembly; 201. an exhaust inlet; 202. an exhaust passage;

21. A bottom plate; 211. a sub-board; 22. a bottom guard board; 221. a limit protrusion; 23. a seal; 231. a first sealing part; 232. a second sealing part; 24. a protective sheet; 241. a weakened area;

30. A water cooling plate; 40. a thermal insulation board; 50. an access panel; 60. an explosion-proof valve;

100. A box assembly; 200. a battery module; 210. a battery cell; 2101. a pressure relief structure;

1000. and a battery pack.

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.

First, a battery pack 1000 according to a second aspect of the present utility model will be briefly described with reference to fig. 1 to 11, and as shown in fig. 1 and 4, the battery pack 1000 includes a plurality of battery cells 210 and a case assembly 100, the plurality of battery cells 210 are assembled in the case assembly 100, a pressure release structure 2101 of the battery cells 210 is disposed toward a bottom of the battery pack 1000, and the pressure release structure 2101 is used for venting pressure when the battery cells 210 are thermally out of control to avoid explosion.

A case assembly 100 of a battery pack 1000 according to an embodiment of the first aspect of the present utility model is described below with reference to fig. 1 to 11.

As shown in fig. 1 to 11, a case assembly 100 of a battery pack 1000 according to an embodiment of the first aspect of the present utility model includes: a frame 10, a floor assembly 20, and a water cooled panel 30.

Specifically, the frame 10 encloses a receiving chamber 101 open at both the top and bottom; the bottom plate assembly 20 is arranged at the bottom of the frame 10 to cover the lower opening of the accommodating cavity 101, the bottom plate assembly 20 comprises a bottom plate 21 and a bottom guard plate 22, the bottom guard plate 22 is arranged at the lower side of the bottom plate 21, an exhaust channel 202 is defined between the bottom plate 21 and the bottom guard plate 22, and the exhaust channel 202 is communicated with the accommodating cavity 101; the water cooling plate 30 is provided at the top of the frame 10, and the water cooling plate 30 is connected to the frame 10 and covers the top opening of the accommodating chamber 101.

In this embodiment, the housing cavity 101 is formed by enclosing the frame 10, and the plurality of battery cells 210 of the battery pack 1000 can be conveniently arranged in the housing cavity 101, so that the frame 10 can have a good protection effect on the plurality of battery cells 210. When the battery pack 1000 operates, the water cooling plate 30 can cool and dissipate heat for a plurality of battery cells 210, and because the water cooling plate 30 covers the top opening of the accommodating cavity 101, the water cooling plate 30 can have a good sealing protection effect for a plurality of battery cells 210, so that the top cover structure of the battery pack 1000 can be better replaced, the top cover structure, corresponding fastening parts and the like of the battery pack 1000 can be reduced after the battery pack 1000 is assembled, the weight of the battery pack 1000 can be reduced, the available space in the battery pack 1000 can be increased to a certain extent, the space of the battery pack 1000 can be more fully utilized, and the energy density of the battery pack 1000 can be well improved.

The bottom plate 21 and the bottom guard plate 22 are arranged in the bottom plate assembly 20, the bottom plate 21 can well support and fix the plurality of battery cells 210 in the accommodating cavity 101, so that the battery cells 210 can be stably accommodated and arranged in the accommodating cavity 101, the bottom plate 21 can be matched with the water cooling plate 30 to clamp and limit the battery cells 210 in the vertical direction, and therefore expansion of the battery cells 210 can be well restrained to a certain extent, and the battery pack 1000 can be operated more stably when in use.

The bottom guard plate 22 can play a good role in protecting the bottom of the battery pack 1000, so that the battery cells 210 in the accommodating cavity 101 can be well buffered when the battery pack 1000 is impacted by the bottom.

In this embodiment, an exhaust channel 202 is formed between the bottom plate 21 and the bottom guard plate 22, the exhaust channel 202 is in communication with the accommodating cavity 101, when the battery cell 210 bursts, high-temperature gas is ejected from the pressure release structure 2101 of the battery cell 210 and flows into the exhaust channel 202 between the bottom plate 21 and the bottom guard plate 22, and the high-temperature gas flows in the exhaust channel 202 and finally is discharged out of the battery pack 1000.

The exhaust channel 202 is formed between the bottom plate 21 and the bottom guard plate 22, so that the occupation of the exhaust channel 202 in the accommodating cavity 101 can be avoided, the available space in the battery pack 1000 can be increased to a certain extent, the exhaust channel 202 is arranged by fully utilizing the space between the bottom plate 21 and the bottom guard plate 22, the space utilization rate in the battery pack 1000 is improved well, and the energy density of the battery pack 1000 can be improved well.

In this embodiment, the exhaust channel 202 is provided in the bottom plate assembly 20 to exhaust and drain the high-temperature gas when the battery unit 210 is sprayed, so that the high-temperature gas can be well isolated from the electrical components, and the risk of ignition of the battery pack 1000 caused by short circuit, electric leakage and the like of the electrical components under the action of the high-temperature gas is avoided, so that the safety of the battery pack 1000 is higher.

According to the box assembly 100 of the battery pack 1000 in the embodiment of the utility model, the exhaust channel 202 is formed between the bottom plate 21 and the bottom guard plate 22, and the water cooling plate 30 covers the top opening of the accommodating cavity 101 formed by enclosing the frame 10, so that the weight of the battery pack 1000 can be effectively reduced, the available space of the battery pack 1000 can be well improved, the space utilization rate of the battery pack 1000 can be well improved, and the energy density and the safety of the battery pack 1000 can be greatly increased.

In one embodiment of the present utility model, the water cooling plate 30 and the plurality of battery cells 210 may be adhered by a heat conductive adhesive. Therefore, the water cooling plate 30 can be conveniently connected with the plurality of battery cells 210, and when the battery pack 1000 is operated, heat generated by the plurality of battery cells 210 can be better transferred to the water cooling plate 30 through the heat conducting adhesive to dissipate heat, so that the heat dissipation effect of the water cooling plate 30 on the plurality of battery cells 210 is better. For example, the heat-conducting glue may be an ultra-high temperature heat-conducting glue, a silicone heat-conducting glue, a polyurethane glue, or the like.

In one embodiment of the present utility model, the battery cell 210 may be adhesively fixed to the base plate 21. Thus, the battery unit 210 can be conveniently fixed and positioned in the accommodating cavity 101, the battery unit 210 is connected with the bottom plate 21 in an adhesive mode, the assembly is simple and convenient, and the fixation is firm. For example, the battery cell 210 may be adhesively fixed to the base plate 21 by means of a structural adhesive.

In some embodiments of the present utility model, as shown in fig. 6, the exhaust passage 202 may extend in a first direction (front-to-back direction as shown in fig. 6), and the floor assembly 20 may further include: and sealing members 23, the sealing members 23 being disposed on both sides of the exhaust passage 202 in a second direction (left-right direction as viewed in fig. 6) perpendicular to the first direction, the sealing members 23 being sealingly connected between the bottom plate 21 and the bottom guard plate 22, the sealing members 23, the bottom plate 21 and the bottom guard plate 22 cooperatively defining the exhaust passage 202.

In this embodiment, the sealing member 23 is connected between the bottom plate 21 and the bottom guard plate 22, which can play a role in reinforcing the structure of the bottom plate 21, so that the assembled bottom plate assembly 20 has better overall structural strength, and the bottom plate 21 can support the battery cells 210 more stably and reliably. The sealing element 23 and the bottom plate 21 and the bottom guard plate 22 cooperate to define the exhaust channel 202, so that the structure is simple, the arrangement is convenient, and when the battery cell 210 is erupted, the sealing element 23 can play a good role in sealing the high-temperature gas flowing in the exhaust channel 202 between the bottom plate 21 and the bottom guard plate 22, so that the high-temperature gas can stably flow along the exhaust channel 202.

In one embodiment of the present utility model, as shown in fig. 6, the sealing member 23 may include: the first sealing parts 231 extend in the first direction, the two first sealing parts 231 are respectively arranged at both sides of the exhaust passage 202 in the second direction, the second sealing part 232 is connected between one ends of the two first sealing parts 231 in the first direction, and the other ends of the two first sealing parts 231 in the first direction are spaced apart to define an exhaust outlet of the exhaust passage 202.

The sealing member 23 is provided with two first sealing members 23 extending in the first direction and one second sealing member 23 is provided to be connected between one ends of the two first sealing members 23 in the first direction, that is, the projection of the sealing members 23 on the horizontal plane may be formed in a U shape. An exhaust channel 202 is arranged between the two first sealing members 23, and one end of the exhaust channel 202 in the first direction is plugged by the second sealing members 23, so that when the battery cell 210 is in thermal runaway, high-temperature gas can only flow along the exhaust channel 202 to an exhaust outlet in the exhaust channel 202, thereby having good flow guiding effect on the high-temperature gas, and the high-temperature gas can better flow out of the battery pack 1000 from the exhaust channel 202.

In some examples of the utility model, referring to fig. 5-9, the floor assembly 20 may further include: the protection sheet 24, the protection sheet 24 is connected with the bottom plate 21, the protection sheet 24 extends along the first direction, the protection sheet 24 covers the exhaust inlet 201 of the exhaust passage 202, a weak area 241 is formed on the protection sheet 24, and the weak area 241 is arranged between the exhaust inlet 201 of the exhaust passage 202 and the accommodating chamber 101.

When thermal runaway occurs in the battery cell 210, high-temperature gas is sprayed from the pressure release structure 2101 of the battery cell 210 to the protective sheet 24, and the weak area 241 of the protective sheet 24 forms an opening under the impact of the high-temperature gas, so that the high-temperature gas can enter the exhaust channel 202 from the exhaust inlet 201 of the exhaust channel 202 for discharging operation. In this embodiment, the protection sheet 24 is disposed at the exhaust inlet 201, which can separate the exhaust channel 202 from the accommodating cavity 101, so that a plurality of battery cells 210 in the accommodating cavity 101 can be in a good airtight environment, and the situation that high-temperature gas flows into the accommodating cavity 101 from the exhaust inlet 201 is reduced, and when the bottom protection sheet 22 at the exhaust channel 202 is damaged, the protection sheet 24 can perform a good stable sealing function on the accommodating cavity 101, thereby improving the safety of the battery pack 1000.

In this embodiment, the weakened area 241 is disposed between the exhaust inlet 201 of the exhaust channel 202 and the accommodating cavity 101, so that the high-temperature gas can more quickly pass through the weakened area 241 and enter the exhaust channel 202, and thus the high-temperature gas can be more quickly discharged into the exhaust channel 202, so that the battery pack 1000 has better safety when thermal runaway occurs. Alternatively, the protective sheet 24 may be fixed to the base plate 21 by double-sided adhesive tape.

In one example of the utility model, the protective sheet 24 may be a high temperature resistant sheet. In this way, the protection sheet 24 can better bear the impact of high-temperature gas, so that the protection sheet 24 can well isolate and protect the high-temperature gas in the exhaust channel 202 from the accommodating cavity 101, and the safety of the battery pack 1000 is better. For example, the guard sheet 24 may be a mica sheet.

In one example of the present utility model, the weakened area 241 may have a thickness of 0.2mm-0.3mm.

The thickness of the weak area 241 of the protection sheet 24 is limited to be between 0.2mm and 0.3mm, so that when the battery cell 210 is sprayed, high-temperature gas can more easily break through the weak area 241 of the protection sheet 24 into the exhaust channel 202, and meanwhile, the weak area 241 of the protection sheet 24 has good isolation effect on the high-temperature gas in the exhaust channel 202. For example, the weakened areas 241 may have a thickness of 0.2mm, 0.22mm, 0.24mm, 0.26mm, 0.28mm, 0.3mm, etc.

In one example of the present utility model, the thickness of the remaining area of the protective sheet 24 excluding the weakened area 241 may be 0.5mm-1mm. This allows the shield 24 to have a thickness sufficient to isolate the high temperature gases within the exhaust passage 202. For example, the thickness of the remaining areas of the protective sheet 24 excluding the weakened areas 241 may be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, etc. Preferably, the thickness of the remaining area of the protective sheet 24 excluding the weakened area 241 is 0.5mm.

In one example of the present utility model, as shown in fig. 6, the number of the exhaust passages 202 may be at least one, and a plurality of the exhaust passages 202 may be arranged at intervals in a second direction perpendicular to the first direction.

Referring to fig. 3 to 6, the battery cells 210 are stacked along a first direction, two pressure release structures 2101 are disposed at the bottom of the battery cell 210, the two pressure release structures 2101 are disposed at intervals along a second direction, and when assembled, the two pressure release structures 2101 of the battery cell 210 may be disposed corresponding to the exhaust channels 202 adjacent to each other in the second direction. At least one exhaust channel 202 is provided, that is, the number of exhaust channels 202 may be one or more, when the exhaust channels 202 are provided with a plurality of exhaust channels, the exhaust space of the formed exhaust channels 202 is smaller, so that high-temperature gas can flow to an exhaust outlet along the exhaust channels 202 more quickly and flow out of the battery pack 1000, the flowing time of the high-temperature gas in the exhaust channels 202 can be reduced, thereby being beneficial to improving the exhaust effect of the exhaust channels 202 and improving the safety of the battery pack 1000 to a certain extent.

In some embodiments of the present utility model, as shown in fig. 5, the base plate 21 may include a plurality of sub-plates 211, the plurality of sub-plates 211 extending in the first direction and being spaced apart in the second direction, the adjacent sub-plates 211 defining an exhaust inlet 201 communicating between the exhaust passage 202 and the receiving chamber 101.

In this embodiment, the bottom plate 21 is composed of a plurality of sub-boards 211, and the exhaust inlet 201 is defined between the connected sub-boards 211, so that the structure is simple, the processing is convenient, and the weight of the bottom plate 21 can be reduced well, thereby improving the energy density of the battery pack 1000 to a certain extent.

In some embodiments of the present utility model, as shown in fig. 10 and 11, the base plate 21 may be a single piece, the base plate 21 is formed with a plurality of exhaust inlets 201 penetrating the base plate 21 up and down, the plurality of exhaust inlets 201 are arranged at intervals along the first direction, and the exhaust passage 202 communicates with the accommodating chamber 101 through the plurality of exhaust inlets 201.

Therefore, the plurality of exhaust inlets 201 penetrating up and down are arranged on the bottom plate 21, the structure is simple, the processing and manufacturing of the bottom plate 21 and the assembly in the box assembly 100 are facilitated, the bottom plate 21 is an integral part, the battery cells 210 in the accommodating cavity 101 can be supported and fixed more stably and reliably, and the stability of the battery cells 210 is better. Specifically, the protection sheet 24 is disposed on the side of the bottom plate 21 facing away from the sealing member 23 and covers the exhaust gas inlet 201, and when thermal runaway occurs in the battery cell 210, the high-temperature gas breaks through the weakened region 241 of the protection sheet 24 and enters the exhaust gas channel 202 from the exhaust gas inlet 201.

The plurality of exhaust inlets 201 can be in one-to-one correspondence with the pressure release structures 2101 of the battery cells 210, so that the exhaust ports can be smaller, high-temperature gas is not easy to flow into the accommodating cavity 101 from the exhaust inlets 201, and the safety of the battery pack 1000 is better. For example, the exhaust inlet 201 may be provided with four, six, eight, ten, twelve, etc. Further, the exhaust inlet 201 may be formed as a waist-shaped hole, which may be larger than the pressure release structure 2101 of the battery cell 210, so that the battery cell 210 can be smoothly exhausted.

In one embodiment of the present utility model, as shown in fig. 6, the bottom guard 22 may be formed with a limiting protrusion 221, the limiting protrusion 221 is formed on a side of the bottom guard 22 facing the bottom plate 21, the limiting protrusion 221 has a plurality of limiting protrusions 221, each of the plurality of limiting protrusions 221 extends along the first direction and is spaced apart in the second direction, and the sealing member 23 is disposed between adjacent limiting protrusions 221 and abuts against a side surface of the limiting protrusion 221.

The bottom guard plate 22 is provided with a plurality of limiting protrusions 221, so that the bottom guard plate 22 can be well structurally reinforced, and when the sealing element 23 and the bottom guard plate 22 are assembled, the limiting protrusions 221 can facilitate positioning and fixing of the sealing element 23 on the bottom guard plate 22, and the sealing element 23 is well limited and fixed, so that the bottom plate assembly 20 is convenient and easy to assemble. Further, the limiting protrusion 221 may abut against the bottom plate 21, so that the bottom plate 21 may be supported and fixed, so that the bottom plate assembly 20 may better support the battery cell 210.

In some embodiments of the present utility model, as shown in fig. 1 and 2, the frame 10 may further define an electrical cavity 102 spaced from the receiving cavity 101, the floor assembly 20 closing the bottom opening of the electrical cavity 102, and the housing assembly 100 further includes an access panel 50 disposed on top of the frame 10 and closing the top opening of the electrical cavity 102.

According to the embodiment, the electric cavity 102 and the accommodating cavity 101 are arranged at intervals, when the battery pack 1000 is out of control, electric components such as high-voltage devices and the like in the electric cavity 102 are well separated from the accommodating cavity 101, the risk of explosion caused by short circuit and fire and the like of the electric components due to high-temperature gas in the battery pack 1000 is effectively reduced, and the exhaust channel 202 is arranged between the bottom plate 21 and the bottom guard plate 22 of the battery pack 1000, so that contact between the high-temperature gas and the electric components and the like is further reduced, and the safety of the battery pack 1000 is greatly improved.

In this embodiment, the access panel 50 is disposed at the top opening of the electrical cavity 102, so that when the battery pack 1000 is in subsequent maintenance operation, a maintenance person can conveniently open the access panel 50 to repair and maintain the electrical components in the electrical cavity 102, and the structure is simple and the use is convenient.

In one embodiment of the present utility model, as shown in fig. 2, an explosion-proof valve 60 may be further included, the explosion-proof valve 60 being provided on the frame 10, and the explosion-proof valve 60 and the electrical chamber 102 being disposed at opposite sides of the frame 10, respectively.

The explosion-proof valve 60 and the electric chamber 102 are arranged at two opposite sides of the frame 10 in the present embodiment, so that contact with electric parts and the like during high-temperature gas discharge can be further reduced, thereby making the safety of the battery pack 1000 better.

In some examples of the utility model, as shown in fig. 2, the frame 10 may further define a vent chamber 103, the vent chamber 103 being juxtaposed with the receiving chamber 101 in a first direction, the vent chamber 103 being located on a side of the receiving chamber 101 facing away from the electrical chamber 102, the vent chamber 103 being in communication with a vent outlet of the bottom vent passage 202 and the explosion proof valve 60.

When thermal runaway occurs in the battery pack 1000, high-temperature gas flows into the exhaust cavity 103 along the exhaust passage 202, and when the air pressure in the exhaust cavity 103 reaches the opening size of the explosion-proof valve 60, the explosion-proof valve 60 is opened, and the high-temperature gas is discharged to the external environment. In this embodiment, the exhaust cavity 103 is provided, and the exhaust cavity 103 is communicated with the exhaust outlet and the explosion-proof valve 60, so that high-temperature gas can be well converged in the exhaust cavity 103, and the high-temperature gas can be conveniently discharged.

In some embodiments of the present utility model, referring to fig. 2, the frame 10 may include: the plurality of longitudinal beams 12 and the plurality of transverse beams 11, the plurality of longitudinal beams 12 extend along the first direction and are arranged at intervals in the second direction, the plurality of transverse beams 11 extend along the second direction and are arranged at intervals in the first direction, and the plurality of longitudinal beams 12 and the plurality of transverse beams 11 are connected and enclose the accommodating cavity 101.

Therefore, the plurality of longitudinal beams 12 and the plurality of transverse beams 11 are arranged, so that the overall structural strength of the frame 10 is higher, and the protection effect of the box assembly 100 on the battery cells 210 is better. The longitudinal beams 12 and the transverse beams 11 are enclosed to form the accommodating cavity 101, so that the structure is simple, and the processing is convenient. For example, the longitudinal beams 12 may be provided with two, three, four, etc., and the transverse beams 11 may be provided with two, three, four, etc. Of course, one longitudinal beam 12 or one transverse beam 11 may be provided, and the number of the longitudinal beams 12 or the transverse beams 11 may be reasonably set according to the design requirement of the battery pack 1000. Specifically, referring to fig. 1 and 2, the cross member 11 may include a front cross member, a middle cross member, and a rear cross member, and the side member 12 may include a middle side member, and the bottom of the cross member 11 and the bottom of the side member 12 are fixedly connected to the floor panel 21.

In one embodiment of the present utility model, as shown in fig. 2, the frame 10 may further include side beams 13, where a plurality of side beams 13 are provided, and the side beams 13 are enclosed to form a frame structure, two ends of the cross beam 11 along the second direction are fixedly connected with the side beams 13, and two ends of the middle longitudinal beam along the first direction are fixedly connected with the cross beam 11. Therefore, the side beams 13 are matched with the cross beams 11 and the longitudinal beams 12 to form the frame 10, the structure is simple, the whole frame 10 is more compact and stable, the side beams 13 can play a good role in protecting a plurality of battery cells 210, electric parts and the like in the battery pack 1000, and the structure is simple and convenient to manufacture. For example, the side sill 13 may be provided with four, five, six, etc. Alternatively, the side members 12, the cross members 11, and the side members 13 in the frame 10 may be manufactured by aluminum extrusion, sheet metal stamping, sheet metal rolling, or aluminum die casting.

In one embodiment of the present utility model, as shown in fig. 1, the box assembly 100 may further include a heat insulation plate 40, where the heat insulation plate 40 covers a side of the cooling plate facing away from the box and is fixedly connected with the cooling plate.

The heat preservation plate 40 is arranged on the water cooling plate 30 to play a role in heat insulation and preservation of the battery pack 1000, so that the influence of the external environment on the water cooling plate 30 and the temperature in the accommodating cavity 101 can be reduced, the water cooling plate 30 can play a good and stable heat dissipation role on the battery cells 210, and the battery pack 1000 can operate and keep good stability. The heat preservation plate 40 has simple structure and good use effect.

A battery pack 1000 according to an embodiment of the second aspect of the present utility model is described below with reference to fig. 1 to 11.

As shown in fig. 1 to 11, a battery pack 1000 according to an embodiment of the present utility model includes a plurality of battery cells 210 and a case assembly 100 of the battery pack 1000 according to the first aspect of the present utility model, and the battery cells 210 are disposed in a receiving chamber 101.

Referring to fig. 1 to 11, the battery cells 210 extend in the second direction, two pressure release structures 2101 are disposed at the bottom of the battery cells 210, the two pressure release structures 2101 are spaced apart in the second direction, and a plurality of battery cells 210 are stacked in the first direction and arranged in parallel in the second direction.

Other constructions and operations of the battery pack 1000 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 1000 of the embodiment of the present utility model, by providing the box assembly 100 of the battery pack 1000 of the first embodiment, the exhaust channel 202 is formed between the bottom plate 21 and the bottom guard plate 22, and the water cooling plate 30 covers the top opening of the accommodating cavity 101 formed by enclosing the frame 10, the weight of the battery pack 1000 can be effectively reduced, the available space of the battery pack 1000 can be well improved, and thus, the space utilization rate of the battery pack 1000 can be well improved, and the energy density and the safety of the battery pack 1000 can be greatly increased.

A battery pack 1000 according to an embodiment of the present utility model will be described below with reference to fig. 1 to 11.

As shown in fig. 1 to 11, the battery pack 1000 includes a battery cell 210 and a case assembly 100, and the case assembly 100 includes a frame 10, a base plate assembly 20, a heat insulation plate 40, a water cooling plate 30, and an access plate 50.

The battery cells 210 are provided with a plurality of battery cells 210, the plurality of battery cells 210 are arranged in a stacked manner along the first direction and are arranged in parallel along the second direction, and two pressure release structures 2101 are arranged at intervals along the second direction at the bottom of the battery cells 210. The frame 10 comprises side beams 13, longitudinal beams 12 and cross beams 11, wherein both ends of the cross beams 11 in the second direction are fixedly connected with the side beams 13, the cross beams 11 comprise front cross beams, middle cross beams and rear cross beams, the cross beams 11 extend in the second direction and are distributed at intervals in the first direction, the longitudinal beams 12 comprise middle longitudinal beams, the middle longitudinal beams extend in the first direction and are positioned between the two side beams 13 in the first direction, the front cross beams and the side beams 13 are matched to define an exhaust cavity 103, and the side beams 13 are provided with explosion-proof valves 60 communicated with the exhaust cavity 103; the front cross beam, the middle cross beam, the rear cross beam and the side beams 13 are matched to define a containing cavity 101, a plurality of battery cells 210 are arranged in the containing cavity 101 and are separated into four parts by the cross beam 11 and the longitudinal beams 12, and the battery cells 210 of each part are combined to form a battery module 200; the rear cross members cooperate with adjacent side rails 13 to define an electrical cavity 102, and the electrical components of the battery pack 1000 are disposed within the electrical cavity 102.

The base plate assembly 20 comprises a base plate 21, a bottom guard plate 22, a sealing piece 23 and a protective piece 24, wherein the base plate 21 and the cross beam 11 can be connected and fixed in a bolt, hot-melt self-tapping mode, riveting mode, welding mode and the like, the base plate 21 is provided with five sub-plates 211, the five sub-plates 211 extend along a first direction and are arranged at intervals, an exhaust inlet 201 is formed between the adjacent sub-plates 211, the bottom guard plate 22 is arranged on the lower side of the base plate 21 and is sealed at the bottom of the frame 10, the sealing piece 23 is arranged between the base plate 21 and the bottom guard plate 22, the protective piece 24 is arranged on the upper side of the sealing piece 23 and is positioned in the exhaust inlet 201, the protective piece 24 seals the exhaust inlet 201, the protective piece 24 is matched with the base plate 21, the sealing piece 23 and the bottom guard plate 22 to define an exhaust channel 202, and an outlet of the exhaust channel 202 faces the exhaust cavity 103 and is communicated with the exhaust cavity 103.

The water cooling plate 30 is covered on the upper openings of the exhaust cavity 103 and the accommodating cavity 101, the access plate 50 is covered on the upper opening of the electric cavity 102, and the heat insulation plate 40 is covered on the water cooling plate 30.

When the solar cell is assembled, the sealing piece 23 is adhered to the bottom guard plate 22, the protective sheet 24 is adhered to the sealing piece 23, the bottom plate 21 is fixedly connected with the frame 10 and fixedly connected with the bottom guard plate 22 together, the protective sheet 24 and the sealing piece 23 are opposite to the exhaust inlet 201, the cell 210 is placed in the accommodating cavity 101 and fixedly adhered to the bottom plate 21, the water cooling plate 30 covers the upper opening of the accommodating cavity 101 and fixedly adhered to the cell 210, and the heat insulation plate 40 is fixedly adhered to the water cooling plate 30.

According to the battery pack 1000 of the present utility model, by providing the box assembly 100 of the battery pack 1000 of the first aspect, the exhaust channel 202 is formed between the bottom plate 21 and the bottom guard plate 22, and the water cooling plate 30 covers the top opening of the accommodating cavity 101 formed by enclosing the frame 10, the weight of the battery pack 1000 can be effectively reduced, the available space of the battery pack 1000 can be well improved, and thus, the space utilization of the battery pack 1000 can be well improved, and the energy density and safety of the battery pack 1000 can be greatly increased.

In another embodiment of the present utility model, the bottom plate 21 is a single piece, the bottom plate 21 is formed with waist-shaped holes corresponding to the pressure release structures 2101 on the battery cells 210 one by one, the waist-shaped holes are formed as the exhaust inlets 201, the sealing member 23 is adhered between the bottom plate 21 and the bottom guard plate 22 when the bottom plate assembly 20 is assembled, and the protective sheet 24 is arranged on one side of the bottom plate 21 away from the bottom guard plate 22 and adhered and capped at the exhaust inlets 201.

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 assembly, comprising:

The frame encloses a containing cavity with the top and the bottom both open;

The bottom plate assembly is arranged at the bottom of the frame to cover the lower opening of the accommodating cavity, and comprises a bottom plate and a bottom guard plate, wherein the bottom guard plate is arranged at the lower side of the bottom plate, an exhaust channel is defined between the bottom plate and the bottom guard plate, and the exhaust channel is communicated with the accommodating cavity;

The water cooling plate is arranged at the top of the frame, is connected with the frame and seals the top opening of the accommodating cavity.

2. The tank assembly of claim 1, wherein the vent passage extends in a first direction,

The floor assembly further includes: and the sealing parts are arranged on two sides of the exhaust channel in a second direction perpendicular to the first direction, the sealing parts are connected between the bottom plate and the bottom guard plate in a sealing mode, and the sealing parts, the bottom plate and the bottom guard plate are matched to define the exhaust channel.

3. The tank assembly of claim 2, wherein the seal comprises: the exhaust passage comprises two first sealing parts and two second sealing parts, wherein the first sealing parts extend along the first direction, the two first sealing parts are respectively arranged on two sides of the exhaust passage in the second direction, the second sealing parts are connected between one ends of the two first sealing parts in the first direction, and the other ends of the two first sealing parts in the first direction are spaced to define an exhaust outlet of the exhaust passage.

4. A tank assembly as claimed in claim 3, further comprising: the protection piece, the protection piece with the bottom plate links to each other, the protection piece is followed the first direction extends, the protection piece covers exhaust passage's exhaust inlet, be formed with the area of weakness on the protection piece, the area of weakness sets up exhaust passage's exhaust inlet with hold between the chamber.

5. The cabinet assembly according to claim 1, wherein the bottom panel includes a plurality of sub-panels extending in a first direction and spaced apart in a second direction, adjacent ones of the sub-panels defining an exhaust inlet communicating between the exhaust passage and the receiving cavity.

6. The tank assembly of claim 1, wherein the base plate is an integral piece, the base plate is formed with a plurality of exhaust inlets penetrating the base plate up and down, the plurality of exhaust inlets are arranged at intervals along a first direction, and the exhaust channel is communicated with the accommodating cavity through the plurality of exhaust inlets.

7. The cabinet assembly of claim 1, wherein the frame further defines an electrical cavity spaced from the receiving cavity, the floor assembly closing a bottom opening of the electrical cavity, the cabinet assembly further comprising an access panel disposed at a top of the frame and closing a top opening of the electrical cavity.

8. The tank assembly of claim 7, further comprising an explosion-proof valve disposed on the frame, and the explosion-proof valve and the electrical cavity are disposed on opposite sides of the frame, respectively.

9. The tank assembly of claim 1, wherein the frame comprises: the longitudinal beams extend along the first direction and are distributed at intervals in the second direction, the transverse beams extend along the second direction and are distributed at intervals in the first direction, and the longitudinal beams and the transverse beams are connected and enclose the accommodating cavity.

10. A battery pack comprising a plurality of battery cells and the case assembly of the battery pack according to any one of claims 1 to 9, the battery cells being disposed in the accommodation chamber.