CN219892290U

CN219892290U - Battery pack bottom protection assembly and battery pack

Info

Publication number: CN219892290U
Application number: CN202321213367.2U
Authority: CN
Inventors: 成传胜; 王南; 赵亮
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2023-05-18
Filing date: 2023-05-18
Publication date: 2023-10-24
Anticipated expiration: 2033-05-18

Abstract

The utility model provides a bottom protection component of a battery pack and the battery pack, wherein the bottom protection component comprises: a bottom guard board; the protection piece is arranged above the bottom protection plate and fixedly connected with the bottom protection plate, the protection piece is used for supporting the battery cells of the battery pack, the protection piece defines an exhaust passage, and the exhaust passage is suitable for corresponding to the explosion-proof parts of the battery cells. From this, through setting up the guard piece to make end backplate and guard piece fixed link to each other, with the structural strength who improves bottom protection subassembly, improve bottom protection subassembly's protection effect, the exhaust passage can be prescribe a limit to simultaneously the guard piece, and gas can be through exhaust passage exhaust battery package, guarantees the security of battery package, and exhaust passage does not occupy the inside free space that sets up the battery of battery package, is favorable to improving the energy density of battery package.

Description

Battery pack bottom protection assembly and battery pack

Technical Field

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

Background

The structural design of the battery pack directly affects the safety performance of the battery pack.

In the related art, the structural strength of the bottom guard plate of the battery pack is poor, resulting in poor protection effect of the bottom guard plate, thereby resulting in poor safety of the battery pack, and simultaneously, the space inside the battery pack is formed with an exhaust passage, resulting in small space for installing the battery cells, resulting in low energy density of the battery pack.

Disclosure of Invention

In view of the foregoing, the present utility model is directed to a bottom protection assembly of a battery pack to improve the structural strength of the bottom protection assembly.

In order to achieve the above purpose, the technical scheme of the utility model is realized as follows:

a bottom guard assembly for a battery pack, comprising: a bottom guard board; the protection piece is arranged above the bottom protection plate and fixedly connected with the bottom protection plate, the protection piece is used for supporting the battery cells of the battery pack, the protection piece defines an exhaust passage, and the exhaust passage is suitable for corresponding to the explosion-proof parts of the battery cells.

According to some embodiments of the utility model, the guard has a first groove recessed toward the bottom shield to form the exhaust passage on a side of the guard away from the bottom shield.

According to some embodiments of the utility model, the bottom guard assembly further comprises: and the elastic support piece is arranged between the bottom guard plate and the guard piece.

According to some embodiments of the utility model, the resilient support has a through hole extending through the resilient support in a height direction of the bottom guard assembly.

According to some embodiments of the utility model, the through holes are a plurality of, and the through holes are sequentially arranged along a plane perpendicular to the height direction of the bottom protection assembly.

According to some embodiments of the utility model, the elastic support comprises: the connecting body is connected between the first side edge and the second side edge to form a plurality of through holes.

According to some embodiments of the utility model, the first tank has a bottom wall, a first side wall and a second side wall, the first side wall and the second side wall being opposite and spaced apart, the bottom wall being connected between the first side wall and the second side wall; the first side wall and/or the second side wall is/are inclined along the height direction of the bottom protection assembly; or the first side wall and/or the second side wall is parallel to the height direction of the bottom guard assembly.

According to some embodiments of the utility model, the guard has a recess recessed away from the backplate to form a second channel on a side of the guard adjacent the backplate, at least part of the resilient support being located within the second channel.

According to some embodiments of the utility model, the front projection of the resilient support and the front projection of the vent channel are offset along the height of the bottom guard assembly.

Compared with the prior art, the bottom protection assembly of the battery pack has the following advantages:

through setting up the guard piece to make end backplate and guard piece fixed link to each other, with the structural strength who improves bottom protection subassembly, improve bottom protection subassembly's protection effect, the exhaust passage can be prescribe a limit to the guard piece simultaneously, gaseous and the material in the battery list can be through exhaust passage exhaust battery package, guarantees the security of battery package, simultaneously, exhaust passage sets up in bottom protection subassembly, exhaust passage does not occupy the battery and sets up the free space of battery in the battery package, can increase the free space of installation battery, is favorable to improving the energy density of battery package.

Another object of the present utility model is to provide a battery pack.

a battery pack, comprising: a battery cell; the battery pack comprises a side frame and a bottom protection assembly, wherein the bottom protection assembly is arranged below the side frame and fixed with the side frame, the side frame and the bottom protection assembly jointly define an installation space, a battery cell is installed in the installation space, and the bottom protection assembly is the bottom protection assembly of the battery pack.

The battery pack has the same advantages as the bottom protection assembly of the battery pack in comparison with the prior art, and the description thereof is omitted.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

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

FIG. 2 is a schematic view of a bottom guard assembly according to an embodiment of the present utility model;

FIG. 3 is an enlarged view of FIG. 2 at A;

FIG. 4 is a partial cross-sectional view of FIG. 2;

FIG. 5 is a schematic view of a structure of an elastic support according to an embodiment of the present utility model;

FIG. 6 is a graphical representation of the performance of an elastic support according to an embodiment of the present utility model;

FIG. 7 is a schematic view of a ball striking explosion proof section area according to an embodiment of the utility model;

fig. 8 is a schematic view of the rest of the ball striking area according to an embodiment of the utility model.

Reference numerals illustrate:

the bottom guard assembly 100, the bottom guard plate 10, the fitting hole 11, the guard 20, the exhaust passage 21, the first tank 22, the bottom wall 221, the first side wall 222, the second side wall 223, the second tank 23, the elastic support 40, the first side edge 41, the second side edge 42, the connection body 43, the through hole 44, the guard plate coating 80, the,

Battery pack 1000, battery module 200, side frame 300, battery pack upper cover 400, structural adhesive 500, sealing strip 600, heat conductive structural adhesive 700, explosion-proof portion 800,

Steel ball 2000.

Detailed Description

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.

The utility model will be described in detail below with reference to the drawings in connection with embodiments.

Referring to fig. 1, 3 and 4, the bottom guard assembly 100 of the battery pack 1000 according to the present utility model includes: the battery pack comprises a bottom guard plate 10 and a guard piece 20, wherein the guard piece 20 is arranged above the bottom guard plate 10 and fixedly connected with the bottom guard plate 10, the guard piece 20 is used for supporting battery cells of the battery pack 1000, the guard piece 20 defines an exhaust channel 21, and the exhaust channel 21 is suitable for corresponding to explosion-proof parts 800 of the battery cells.

Specifically, the bottom protection assembly 100 is disposed at the bottom of the battery pack 1000, and the bottom protection assembly 100 may be used to support a battery cell, the protection member 20 is fixed on a surface of the bottom protection plate 10 opposite to the battery cell, a side of the protection member 20 facing away from the bottom protection plate 10 is fixedly connected with the battery cell, the protection member 20 may be used to support the battery cell, a surface of the side of the battery cell opposite to the protection member 20 is provided with the explosion-proof portion 800, the explosion-proof portion 800 may be configured as an explosion-proof valve, when the battery pack 1000 receives an impact force from the bottom, the protection member 20 and the bottom protection plate 10 may protect the battery cell and the explosion-proof portion 800, and by fixedly connecting the protection member 20 with the bottom protection plate 10, the structural strength of the bottom protection assembly 100 may be improved, and the anti-collision capability of the bottom protection assembly 100 may be improved.

With further reference to fig. 3 and 4, the side of the guard 20 facing away from the bottom guard plate 10 defines an exhaust passage 21, the exhaust passage 21 is in communication with the outside of the battery pack 1000, and the explosion-proof part 800 is disposed opposite to the exhaust passage 21 so that the explosion-proof part 800 is in communication with the exhaust passage 21, and when the battery pack 1000 is thermally out of control, high-temperature gas and waste excreta generated in the battery cells can be discharged into the exhaust passage 21 through the explosion-proof part 800 to be electrically separated from the battery pack 1000 and can be rapidly discharged out of the battery pack 1000 through the exhaust passage 21, thereby ensuring the safety of the battery pack 1000.

From this, through setting up guard 20, and make end backplate 10 and guard 20 fixed link to each other, with the structural strength who improves bottom protection subassembly 100, improve the protective effect of bottom protection subassembly 100, simultaneously guard 20 can inject exhaust passage 21, when the free explosion-proof part 800 of battery is opened, gas and material in the battery monomer can follow exhaust passage 21 and discharge battery package 100, guarantee the security of battery package, simultaneously, exhaust passage 21 sets up in bottom protection subassembly 100, exhaust passage 21 does not occupy the inside free space that sets up of battery package 1000, can increase the free space of installation battery, be favorable to improving the energy density of battery package 1000.

According to the bottom protection assembly 100 of the battery pack 1000, the protection piece 20 is arranged, the bottom protection plate 10 is fixedly connected with the protection piece 20, so that the structural strength of the bottom protection assembly 100 is improved, the protection effect of the bottom protection assembly 100 is improved, the protection piece 20 can define the exhaust channel 21, when the explosion-proof part 800 of the battery unit is opened, gas and substances in the battery unit can be discharged out of the battery pack 1000 from the exhaust channel 21, the safety of the battery pack 1000 is ensured, meanwhile, the exhaust channel 21 is arranged in the bottom protection assembly 100, the exhaust channel 21 does not occupy the space for arranging the battery unit in the battery pack 1000, the space for installing the battery unit can be increased, and the energy density of the battery pack 1000 is improved.

Further, the bottom guard plate 10 may be made of high-strength steel (HC 340/590 DP) or heat-formed steel, etc., to ensure structural strength of the bottom guard plate 10; or the bottom guard plate 10 can be partially made of high-strength steel or rolled steel, and the rest is made of common steel, so that the production cost of the bottom guard plate 10 is reduced.

The protecting piece 20 can be made of common steel, high-strength steel (HC 340/590 DP), hot forming steel (such as B1500 HS), roll steel and other materials, so that the protecting piece 20 has good impact resistance and energy absorption effect, and the protecting capability of the protecting piece 20 is improved; the guard 20 may also be preferably composed of a variety of materials to reduce the cost of the guard 20 while ensuring rigidity of the guard 20.

The bottom guard plate 10 and the guard piece 20 can be fixedly connected through spot welding so as to ensure the connection reliability between the bottom guard plate 10 and the guard piece 20; the bottom guard plate 10 and the guard piece 20 can be adhered by high-strength glue, so that the bottom guard plate 10 and the guard piece 20 can be fixed, processed and assembled conveniently, and the specific fixed connection mode of the bottom guard plate 10 and the guard piece 20 is not limited.

In addition, a plurality of battery cells are sequentially arranged to form the battery module 200, and the battery module 200 may be adhesively connected with the protection member 20 through the structural adhesive 500, so that the battery pack 1000 is fabricated and assembled.

Referring to fig. 2 and 3, in some embodiments of the present utility model, the guard 20 has a first groove 22 recessed toward the bottom shield 10 to form an exhaust passage 21 on a side of the guard 20 remote from the bottom shield 10.

Specifically, the protection member 20 is constructed in a bent plate, and the bent plate is formed with a first groove 22 recessed toward one side of the bottom protection plate 10, the first groove 22 may be constructed in a U-shape, and the U-shaped opening of the first groove 22 is opened toward one side of the battery module 200, so that the exhaust passage 21 is disposed opposite to and communicates with the explosion-proof part 800, gas can be rapidly discharged from the inside of the battery pack 1000, and the safety of the battery pack 1000 is improved.

Further, the shielding member 20 is constructed as a bending plate, and the bending plate is formed with a U-shaped groove, which can effectively improve the structural strength and rigidity of the shielding member 20, and the exhaust passage 21 has a buffering and energy absorbing effect, so that the shielding effect of the bottom shielding assembly 100 can be further improved.

In a further embodiment of the present utility model, referring to fig. 1, 2 and 3, the protection member 20 is formed with a plurality of first grooves 22 in the first direction, that is, the protection member 20 is formed with a plurality of first grooves 22, and the plurality of first grooves 22 can further improve the structural strength of the protection member 20 due to the structural strength of the first grooves 22, thereby improving the protection effect of the bottom protection assembly 100, and the protection member 20 can define the exhaust channel 21, so that the exhaust channel 21 does not occupy the space for disposing the battery cells inside the battery pack 1000, thereby being beneficial to improving the energy density of the battery pack 1000.

The "first direction" is the width direction of the bottom cover 10, the "second direction" is the longitudinal direction of the bottom cover 10, and the "third direction" is the height direction of the battery pack 1000, and a specific schematic view thereof can be shown in fig. 1.

Accordingly, when the plurality of first grooves 22 are formed on the protection member 20, the protection member 20 may define a plurality of vent passages 21 to improve the venting efficiency of the battery pack 1000, improve the safety of the battery pack 1000, and reduce the risk of explosion of the battery pack 1000 during thermal runaway.

Referring to fig. 3 and 4, in some embodiments of the utility model, the bottom guard assembly 100 further comprises: and an elastic support member 40, the elastic support member 40 being disposed between the bottom guard plate 10 and the guard member 20.

Specifically, the elastic supporting member 40 and the bottom protecting plate 10 and the protecting member 20 may be fixedly connected by gluing or an equivalent process, so as to ensure connection reliability of the elastic supporting member 40 and the bottom protecting plate 10 and the protecting member 20, and meanwhile, the elastic supporting member 40, the bottom protecting plate 10 and the protecting member 20 may further improve structural strength of the bottom protecting assembly 100, and the elastic supporting member 40 has elasticity, when the bottom protecting plate 10 is impacted, the elastic supporting member 40 may deform to play a role of buffering and absorbing energy, thereby protecting the battery module 200 and the explosion-proof portion 800, improving protection capability of the bottom protecting assembly 100, and improving vibration resistance performance of the battery pack 1000, so as to improve safety and service life of the battery pack 1000.

As shown in fig. 5, in some embodiments of the present utility model, the elastic support 40 has a through hole 44, and the through hole 44 penetrates the elastic support 40 in the height direction of the bottom guard assembly 100.

Specifically, the elastic support member 40 is provided with a through hole 44 penetrating the elastic support member in the third direction, so that a cavity is formed inside the elastic support member 40, and the cavity has a buffering and energy absorbing effect, so that the damping and energy absorbing effect of the elastic support member 40 can be further improved, the protection capability of the bottom protection assembly 100 is further improved, the vibration resistance performance of the battery pack 1000 is improved, and the safety and the service life of the battery pack 1000 are improved.

In some embodiments of the present utility model, as shown in fig. 5, the through holes 44 are plural, and the plural through holes 44 are sequentially arranged along a plane perpendicular to the height direction of the bottom shielding assembly 100.

Specifically, the plurality of through holes 44 are sequentially arranged on the elastic support member 40, so as to further improve the vibration damping and energy absorbing effects of the elastic support member 40, further improve the protection capability of the bottom protection assembly 100, improve the vibration resistance performance of the battery pack 1000, and improve the safety and the service life of the battery pack 1000.

Meanwhile, the plurality of through holes 44 are arranged on the elastic support piece 40, so that the material consumption of the elastic support piece 40 can be saved, and the production cost can be reduced.

As shown in fig. 5, in some embodiments of the present utility model, the elastic support 40 includes: the first side 41, the connecting body 43 and the second side 42, the first side 41 and the second side 42 are opposite and spaced apart, and the connecting body 43 is connected between the first side 41 and the second side 42 to form a plurality of through holes 44.

Specifically, referring to fig. 1 and 5, the first side 41 and the second side 42 are opposite to each other in the first direction and are spaced apart, the connection body 43 is disposed between the first side 41 and the second side 42, and the connection body 43 is fixedly connected to the first side 41 and the second side 42, wherein the connection body 43 may be formed of a partition rib extending in a fold line, and the partition rib may define a plurality of through holes 44 together with the first side 41 and the second side 42, and at the same time, the partition rib may define a plurality of through holes 44, and the partition rib may be used to support the first side 41 and the second side 42, ensuring that the elastic support 40 has a certain rigidity.

Alternatively, the resilient support 40 may be made of a high energy absorbing material, such as: the elastic support member 40 may be made of soft PP (PP is simply referred to as polypropylene material) or microporous PP (e.g., EPP45, EPP60, EPP90, 5 times MPP or 140 times MPP, wherein EPP refers to foamed polypropylene material, and MPP refers to microporous foamed polypropylene material).

Furthermore, connecting the body 43 with the first side 41 and the second side 42 may define the elastic support 40 as a honeycomb or square hole shape, for example: the elastic support member 40 may be configured as MPP square microporous foam or MPP cellular foam to enhance the buffering and energy absorbing effects of the elastic support member 40, it will be understood that the elastic support member 40 may also be configured as an ellipse, and the specific shape of the elastic support member 40 is not limited herein.

In some embodiments of the utility model, referring to fig. 3 and 4, the guard 20 has a recess recessed away from the backplate 10 to form a second channel 23 on a side of the guard 20 adjacent the backplate 10, at least a portion of the resilient support 40 being located within the second channel 23.

Specifically, the second groove body 23 recessed from the bottom guard plate 10 to the battery module 200 side is formed on the guard 20, and the second groove body 23 is constructed in an inverted U-shape, and the structural strength of the guard 20 can be further improved by providing a plurality of U-shaped grooves on the guard 20 due to the structural strength of the U-shaped grooves.

Further, the U-shaped opening of the second groove 23 is opened to one side of the bottom guard plate 10, so that a cavity structure is formed between the second groove 23 and the bottom guard plate 10, the elastic support 40 can be supported between the guard 20 and the bottom guard plate 10, and the elastic support 40 can play a role of buffering and absorbing energy between the bottom guard plate 10 and the guard 20, so as to ensure the protection effect of the bottom guard assembly 100.

In addition, the elastic supporting members 40, the shielding members 20 and the bottom shielding plate 10 are fixedly connected to improve structural rigidity of the bottom shielding plate 10 assembly, and a cavity structure is formed between the shielding members 20 and the bottom shielding plate 10, so that energy absorption effect of the bottom shielding assembly 100 can be improved, and the shielding effect of the bottom shielding assembly 100 on the battery module 200 and the explosion-proof part 800 can be improved.

Alternatively, the elastic support 40 may be partially disposed within the second groove 23, for example: the end of the elastic support 40 may be disposed in the second groove 23; or the elastic supporting members 40 may be entirely accommodated in the second groove body 23, improving the supporting effect of the elastic supporting members 40 on the protection member 20 and the bottom protection plate 10, reducing the impact force transmitted to the protection member 20, thereby reducing the impact force transmitted to the battery module 200, and improving the protection effect of the bottom protection assembly 100.

In some embodiments of the present utility model, the bent portion of the protection member 20 (i.e., the connection position of the bottom wall 221 and the side wall of the first slot body 22 or the connection position between the side wall surface and the top wall of the second slot body 23) may have rounded corners for smooth transition to improve the structural strength of the protection member 20, and the rounded corners for transition may be used to disperse the impact force transmitted from the bottom protection plate 10 when the bottom protection assembly 100 is impacted, thereby improving the protection effect of the protection member 20 on the battery cell and the explosion-proof part 800.

Optionally, the rounded corner of the protection member 20 preferably has an included angle of 10 ° to 30 ° for smooth transition, for example, the rounded corner of the protection member 20 may be 15 °, 20 ° or 25 °, so as to prevent the wall thickness at the bending portion of the protection member 20 from being too large due to the oversized rounded corner, ensure the uniformity of the wall thickness of the protection member 20, and prevent the protection member 20 from breaking due to the too small rounded corner.

Referring to fig. 1, 4 and 5, in some embodiments of the present utility model, the elastic support member 40 is configured in a honeycomb shape, that is, each through hole 44 is configured in a polygonal hole structure, and the length of the explosion-proof portion 800 (that is, the dimension of the explosion-proof portion 800 in the first direction) is set to L, and the side length c of the through hole 44 satisfies the following relationship: 0.1 L.ltoreq.c.ltoreq.0.4L, preferably, (1/6) L.ltoreq.c.ltoreq.1/3) L, the dimension e of the through hole 44 in the first direction preferably satisfies the following relation: e is more than or equal to 0.25L and less than or equal to 0.5L, and the design can prevent the through hole 44 from being excessively large or excessively small in size so as to influence the energy absorption effect of the cavity in the through hole 44.

The dimension of the elastic support 40 in the third direction (i.e., the height of the elastic support 40) is h, which may be determined according to the design space of the bottom protection assembly 100 or the height of the second groove 23, and the interval f between two adjacently disposed through holes (i.e., the thickness of the separating rib) preferably satisfies the following relationship: 0.2h is less than or equal to f is less than or equal to 0.5h, wherein f is more than or equal to 0.2h can ensure the thickness of the separation rib, prevent that the energy absorption effect of the elastic support piece 40 is poor because of the too small thickness of the separation rib, and can ensure the rigidity of the elastic support piece 40, ensure the supporting effect of the elastic support piece 40 on the protection piece 20, simultaneously f is less than or equal to 0.5h can prevent that the thickness of the separation rib is too big and influence the quantity of the through holes 44 of the elastic support piece 40 to set up, ensure that the cavity formed in the elastic support piece 40 can meet the energy absorption requirement of the elastic support piece 40.

The inner angle of the through hole 44 defined by the fold line extension of the partitioning rib is α, and α preferably satisfies 90 ° or more α or less than 150 °, for example: alpha can be 90 degrees, 100 degrees, 135 degrees, etc.; the width d of the elastic supporting member 40 (i.e., the dimension of the elastic supporting member 40 in the first direction) preferably satisfies that d is 1.0L is less than or equal to 1.5L, d is less than or equal to 1.5L, which can ensure that the energy absorbing effect of the elastic supporting member 40 is better, and can prevent the second groove 23 from being large due to the excessively large width of the elastic supporting member 40, and reasonably arrange the dimension of the protecting member 20, wherein d is more than or equal to 1.0L, which can prevent the insufficient width of the elastic supporting member 40 from causing the poor energy absorbing effect of the elastic supporting member 40.

Thus, the rigidity of the elastic support 40 can be ensured, and the cushioning and energy absorbing effects of the elastic support 40 can be ensured, and fig. 6 is a diagram showing deformation characteristics of the elastic support 40 of the present utility model when being stressed, wherein the abscissa of the diagram shows strain of the elastic support 40 (which can also be understood as the compression amount of the elastic support 40), and the ordinate shows stress of the elastic support 40, and it can be seen from the diagram that when the compression amount of the elastic support 40 is larger, the internal stress of the elastic support 40 is larger.

It will be understood, of course, that the dimensions of the elastic support member 40 may be configured otherwise, so long as the rigidity of the elastic support member 40 and the cushioning effect are ensured to meet the requirements, and the specific dimensions are not limited herein.

Referring to fig. 3 and 4, in some embodiments of the present utility model, the first tank 22 has a bottom wall 221, a first side wall 222, and a second side wall 223, the first side wall 222 and the second side wall 223 being opposite and spaced apart, the bottom wall 221 being connected between the first side wall 222 and the second side wall 223; the first side wall 222 and the second side wall 223 are inclined in the height direction of the bottom guard assembly 100; or the first side wall 222 and the second side wall 223 are parallel to the height direction of the bottom guard assembly 100.

It should be noted that, the "bottom wall 221" refers to a wall surface of the first groove 22 opposite to the bottom protection plate 10 in the third direction, the first side wall 222 and the second side wall 223 are respectively connected to two sides of the bottom wall 221 in the first direction, and the first side wall 222 may be disposed at an included angle with the bottom wall 221, and the first side wall 222 extends obliquely in a direction away from the bottom wall 221 along the direction in which the bottom protection plate 10 extends toward the battery module 200, so that the first side wall 222 is disposed at an included angle with the bottom wall 221.

Alternatively, the second side wall 223 may be disposed at an angle to the bottom wall 221, and the second side wall 223 extends obliquely in a direction away from the bottom wall 221 along the direction in which the bottom protection plate 10 extends toward the battery module 200, such that the second side wall 223 is disposed at an angle to the bottom wall 221.

In addition, the first side wall 222 and the second side wall may each be disposed at an angle to the bottom wall 221, and the angles formed between the first side wall 222 and the second side wall 223 and the bottom wall 221 may be the same or different, which are not particularly limited herein.

Taking the example that the first side wall 222 and the second side wall 223 are disposed at an angle with the bottom wall 221, and the angles formed between the first side wall 222 and the second side wall 223 and the bottom wall 221 are the same, the angles formed between the first side wall 222 and the second side wall 223 and the bottom guard plate 10 are the same, so as to ensure the structural consistency of the guard 20, so as to facilitate the processing of the guard 20, and the angles formed between the first side wall 222 and the second side wall 223 and the bottom guard plate 10 are defined as beta, preferably 30 degrees less than or equal to beta less than or equal to 60 degrees, for example: beta may be 30 deg., 45 deg., 60 deg., etc.

The energy absorbing effect of the protection member 20 is prevented from being affected by too small inclination angles between the first and second side walls 222 and 223 and the bottom wall 221, and at the same time, the arrangement space of the exhaust passage 21 can be prevented from being occupied by too large inclination angles between the first and second side walls 222 and 223 and the bottom wall 221.

The dimension b of the bottom wall 221 in the first direction (i.e., the width of the bottom wall 221) preferably satisfies the relation: 1.1 L.ltoreq.b.ltoreq.1.5L, the orthographic projection width of the first side wall 222 and the orthographic projection width of the second side wall 223 are both a along the height direction of the bottom guard assembly 100, and a satisfies the relation: a is more than or equal to 0.1b and less than or equal to 0.2b.

Specifically, as shown in fig. 4, setting the width of the bottom wall 221 to b+.1.1L can ensure that the exhaust passage 21 has a sufficient width dimension, avoid the explosion-proof portion 800 from abutting against the first side wall 222 or the second side wall 223, and ensure the flow efficiency of the gas, so that the gas can quickly exit the battery pack 1000 through the exhaust passage 21, improve the safety of the battery pack 1000, b+.1.5L can prevent the arrangement space of the second groove body 23 from being occupied due to the too large width of the exhaust passage 21, and ensure the reasonable distribution of the arrangement space of the first groove body 22 and the second groove body 23.

Further, the front projection width of the first side wall 222 and the front projection width of the second side wall 223 are both a, which can be also understood that the distance between the elastic support member 40 and the bottom wall 221 or the explosion-proof portion 800 of the first tank body 22 in the first direction is a, and a satisfies the relationship: 0.1b.ltoreq.a0.2b, preferably, 0.125b.ltoreq.a0.2b, and a.ltoreq.0.125 b may ensure the size of the cavity structure formed between the elastic support 40 and the first sidewall 222 or the second sidewall 223, thereby ensuring the energy absorbing effect of the cavity structure, improving the buffering energy absorbing effect of the bottom protection assembly 100, and a.ltoreq.0.2b to prevent the excessive space between the elastic support 40 and the explosion-proof part 800, thereby ensuring the protection effect of the elastic support 40 on the explosion-proof part 800.

It will of course be appreciated that the sizing of the guard 20 may be configured otherwise, and that the particular sizing may be determined in conjunction with the spatial design of the interior of the battery pack, and is not specifically limited herein.

Alternatively, the first side wall 222 may be disposed perpendicular to the bottom wall 221, that is, an included angle formed between the first side wall 222 and the bottom wall 221 is 90 °, so that the first side wall 222 may support the top wall of the second tank 23 under the condition that the arrangement space of the exhaust passage 21 is sufficient, and structural strength of the second tank 23 is improved.

Likewise, the second side wall 223 may be disposed perpendicular to the bottom wall 221, that is, an included angle formed between the second side wall 223 and the bottom wall 221 is 90 °, so that the second side wall 223 may support the top wall of the second tank 23 under the condition that the arrangement space of the exhaust passage 21 is sufficient, and the structural strength of the second tank 23 is improved.

Wherein, the first side wall 222 and the second side wall 223 may be perpendicular to the bottom wall 221, which ensures structural consistency of the protection frame 20 and facilitates processing of the protection member 20.

As shown in fig. 4, in some embodiments of the present utility model, the explosion-proof part 800 is welded to the battery cell, the top wall of the second groove 23 is spaced apart from the welding position of the explosion-proof part 800 in the first direction, and the distance g between the top wall and the welding position of the explosion-proof part 800 is about 10mm, so as to protect the welding position of the explosion-proof part 800 and the battery cell, prevent cracking after being stressed at the welding position of the explosion-proof part 800, and improve the service life of the battery pack 1000.

Fig. 7 and 8 show impact analysis of the bottom guard assembly 100 using a steel ball 2000 of 25mm diameter with an energy of 120J, as can be seen from the data shown in table 1 below, by performing ball impact experiments on the related art scheme and the explosion proof section 800 area and the remaining area of the present utility model: in the related art, when the steel ball 2000 impacts other areas, the experimental result is 4.361mm, which exceeds the threshold value by 2.5mm, and when the steel ball 2000 impacts other areas of the bottom protection assembly 100 of the present utility model, the experimental result is 2.214mm, which is less than the threshold value by 2.5mm, when the steel ball 2000 impacts the explosion-proof portion 800 area of the related art, the experimental result is 1.426mm, and when the steel ball 2000 impacts the explosion-proof portion 800 area of the present utility model, the steel ball is not extruded to the explosion-proof portion, and the result indicates that the technical scheme of the present utility model has a good protection effect on the battery cell and the explosion-proof portion 800.

TABLE 1

In some embodiments of the present utility model, as shown in fig. 3, the front projection of the resilient support 40 is offset from the front projection of the vent passageway 21 in the height direction of the bottom shield assembly 100.

Specifically, the second groove bodies 23 are arranged in a plurality along the first direction, the plurality of second groove bodies 23 are arranged at intervals in the first direction, a first groove body 22 can be arranged between every two adjacent second groove bodies 23, namely, the second groove bodies 23 and the first groove bodies 22 are staggered, and the elastic support pieces 40 are arranged in the second groove bodies 23, so that the orthographic projection of the elastic support pieces 40 and the orthographic projection of the exhaust channel 21 are staggered, the elastic support pieces 40 can avoid the exhaust channel 21, the space of the exhaust channel 21 occupied by the elastic support pieces 40 is avoided, the exhaust efficiency of gas generated by a battery monomer through the exhaust channel 21 is ensured, and the safety of the battery pack 1000 is ensured.

It will be understood, of course, that the number of resilient supports 40 may be the same as the number of second slots 23 to enhance the energy absorbing effect of the foot protection assembly 100; the number of the elastic supporting members 40 may also be smaller than the number of the second slots 23 to reduce the production cost of the bottom protection assembly 100, and the specific number of the elastic supporting members 40 may be set in combination with the actual working condition of the battery pack 1000, which is not limited herein.

In some embodiments of the present utility model, the bottom guard assembly 100 of the present utility model may be matched and selected according to different battery packs 1000, ensuring the suitability of the bottom guard assembly 100 of the present utility model.

Referring to fig. 1 and 2, a battery pack 1000 according to the present utility model includes: the battery monomer, side frame 300 and bottom protection subassembly 100, bottom protection subassembly 100 locate side frame 300 below and fixed with side frame 300, and side frame 300 and bottom protection subassembly 100 limit the installation space jointly, and the battery monomer is installed in the installation space, and bottom protection subassembly 100 is the bottom protection subassembly 100 of above-mentioned battery package 1000.

Specifically, a plurality of screw coupling holes are formed at the lower side of the side frame 300, the bottom protection plate 10 is formed with a coupling hole 11 corresponding to the plurality of screw coupling holes, and the screw coupling member fixedly connects the bottom protection plate 10 with the side frame 300 through the screw coupling holes and the coupling hole 11, and the battery module 200 is mounted in the mounting space defined by the side frame 300 and the bottom protection assembly 100.

According to the battery pack 1000 disclosed by the utility model, the bottom protection assembly 100 is arranged to improve the buffering energy absorption effect of the bottom of the battery pack 1000 and the anti-collision capability of the bottom of the battery pack 1000, and the bottom protection assembly 100 is arranged to be beneficial to improving the energy density of the battery pack 1000, meanwhile, the safety of the battery pack 1000 can be ensured, the structural strength of the bottom of the battery pack 1000 can be improved without arranging a cross beam or a longitudinal beam in the battery pack 1000, the overall vibration performance of the battery pack 1000 is improved, meanwhile, the weight of the battery pack 1000 can be reduced, the production cost of the battery pack 1000 is reduced, the manufacturing process of the battery pack 1000 is simplified, and the verification period of the performance of the battery pack 1000 is facilitated to be shortened.

As shown in fig. 2, in some embodiments of the present utility model, the bottom protection plate 10 may be provided with a protection plate coating 80, and the protection plate coating 80 may be made of a material configured as simian diamond, so as to improve the corrosion resistance of the bottom protection assembly 100, improve the service life of the bottom protection assembly 100, and simultaneously, the protection plate coating 80 may have a fireproof and flame retardant effect, so as to improve the safety of the battery pack 1000.

As shown in fig. 1, in some embodiments of the present utility model, the battery pack 1000 further includes a battery pack upper cover 400, the battery pack upper cover 400 and the bottom guard assembly 100 are disposed opposite to each other in the third direction, and the battery pack upper cover 400 may be coupled to the side frames 300 to close an installation space defined by the bottom guard assembly 100 and the side frames 300 together, and the battery pack upper cover 400 may be fixedly coupled to the side frames 300 to thereby achieve the fixed coupling of the battery pack upper cover 400, the side frames 300 and the bottom guard assembly 100, and the battery module 200 is disposed between the bottom guard assembly 100 and the battery pack upper cover 400.

In addition, be provided with heat transfer device between battery package upper cover 400 and the battery module 200, heat transfer device can be constructed to the liquid cooling board, and the liquid cooling board can exchange heat with battery module 200 to cool down cooling or samming to battery module 200, guarantee the uniformity of battery module 200 temperature, the liquid cooling board can be used for supporting battery module 200 simultaneously, in order to improve the structural strength of battery package 1000, heat conduction structure glues 700 and has the heat conduction effect, in order to guarantee the heat transfer effect between battery module 200 and the liquid cooling board.

Referring to fig. 1 and 2, in some embodiments of the present utility model, a sealing strip 600 is provided at the outer circumferential edge of the bottom guard plate 10, and the sealing strip 600 is interposed between the bottom guard plate 10 and the side frames 300 to prevent gaps from being formed between the side frames 300 and the bottom guard plate 10, prevent foreign matters such as dust from entering the battery pack 1000, and improve the sealing effect of the battery pack 1000. The sealing strip 600 may be configured of a silica gel material, so as to prevent the sealing strip 600 from being damaged by high temperature generated during charging and discharging of the battery pack 1000, although it will be understood that the sealing strip 600 may be configured of other materials, and is not limited herein.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims

1. A bottom guard assembly for a battery pack, comprising:

a bottom guard board;

the protection piece is arranged above the bottom protection plate and fixedly connected with the bottom protection plate, the protection piece is used for supporting the battery cells of the battery pack, the protection piece defines an exhaust passage, and the exhaust passage is suitable for corresponding to the explosion-proof parts of the battery cells.

2. The battery pack bottom guard assembly of claim 1, wherein the guard has a first channel recessed toward the bottom guard to form the vent channel on a side of the guard away from the bottom guard.

3. The battery pack bottom guard assembly of claim 1, further comprising: and the elastic support piece is arranged between the bottom guard plate and the guard piece.

4. The bottom guard assembly of claim 3, wherein the elastic support has a through hole penetrating the elastic support in a height direction of the bottom guard assembly.

5. The bottom guard assembly of claim 4, wherein the plurality of through holes are sequentially arranged along a plane perpendicular to a height direction of the bottom guard assembly.

6. The battery pack bottom guard assembly of claim 5, wherein the resilient support comprises: the connecting body is connected between the first side edge and the second side edge to form a plurality of through holes.

7. The bottom guard assembly of claim 2, wherein the first channel has a bottom wall, a first side wall, and a second side wall, the first side wall and the second side wall being opposite and spaced apart, the bottom wall being connected between the first side wall and the second side wall;

the first side wall and/or the second side wall is/are inclined along the height direction of the bottom protection assembly;

or the first side wall and/or the second side wall is parallel to the height direction of the bottom guard assembly.

8. The bottom guard assembly of any one of claims 3-6, wherein the guard has a recess recessed away from the bottom guard to form a second channel on a side of the guard adjacent the bottom guard, at least a portion of the resilient support being located within the second channel.

9. The battery pack bottom guard assembly of any one of claims 3-6, wherein the front projection of the resilient support and the front projection of the vent channel are offset along the height of the bottom guard assembly.

10. A battery pack, comprising:

a battery cell;

side frame and bottom protection subassembly, bottom protection subassembly is located side frame below and with the side frame is fixed, the side frame with bottom protection subassembly defines the installation space jointly, battery cell install in the installation space, bottom protection subassembly is the bottom protection subassembly of battery package according to any one of claims 1-9.