CN215680848U

CN215680848U - Battery pack and vehicle

Info

Publication number: CN215680848U
Application number: CN202121224391.7U
Authority: CN
Inventors: 黄雄
Original assignee: Beijing CHJ Automotive Information Technology Co Ltd
Current assignee: Beijing CHJ Automotive Information Technology Co Ltd
Priority date: 2021-06-01
Filing date: 2021-06-01
Publication date: 2022-01-28
Anticipated expiration: 2031-06-01

Abstract

The present disclosure relates to the field of vehicle technology, and in particular, to a battery pack and a vehicle. Wherein the battery package includes upper cover and box, and the upper cover lid closes the top at the box, and the upper cover includes the apron, along the apron edge downwardly extending formation the skirtboard and along the connecting plate of the outside extension formation of lower extreme of skirtboard, and the upper end laminating and sealing connection of connecting plate and box have weak structure between the upper end of connecting plate and box. When gas pressure in the box reached and predetermine pressure threshold value, can form the mouth that loses heart with weak structural damage between the upper end of connecting plate and box, can be quick to the inside pressure release that exhausts of battery package, avoid the emergence of thermal runaway phenomenon. And because weak structure sets up between the upper end of connecting plate and box, consequently when carrying out the pressure release to battery package inside, the exhaust direction does not face passenger cabin, can effectually prevent that the inside exhaust high temperature gas of battery package from entering into passenger cabin, avoids causing the influence to passenger's safety.

Description

Battery pack and vehicle

Technical Field

The present disclosure relates to the field of vehicle technology, and in particular, to a battery pack and a vehicle.

Background

The battery pack is used as a key part of the electric automobile, and the safety of the battery pack directly influences the safety performance of the whole automobile. One important aspect of the safety of the battery pack is how to prevent or delay the thermal diffusion of the whole pack due to the thermal runaway of the battery cell.

One current measure to retard thermal diffusion is to rapidly vent the battery pack when thermal runaway occurs, thereby rapidly venting the mixture of high temperature gases and particles inside the battery pack. Generally, a plurality of spring-type or thimble-type explosion-proof valves are mounted on an upper cover or a lower case of the battery pack as an exhaust passage, but the explosion-proof valves have problems of easy blockage, high opening pressure, limited exhaust capacity, and the like, and also cause increase in cost and weight of the battery pack.

SUMMERY OF THE UTILITY MODEL

To solve the technical problem or at least partially solve the technical problem, the present disclosure provides a battery pack and a vehicle.

The utility model provides a battery pack, including upper cover and box, the upper cover lid closes the top of box, just the upper cover includes the apron, follows the skirtboard that the edge downwardly extending of apron formed and follow the connecting plate that the lower extreme of skirtboard outwards extended and formed, the connecting plate with the laminating of the upper end of box and sealing connection, just the connecting plate with weak structure has between the upper end of box.

Optionally, the connecting plate is connected with the box body in a sealing manner through a sealing strip.

Optionally, weak structure is including setting up arch portion on the connecting plate is in with the setting the arch of sealing strip, protruding with arch portion laminating sets up.

Optionally, the arch portion extends from the inner edge of the connecting plate to the outer edge of the connecting plate.

Optionally, the protrusion and the sealing strip are integrally formed or fixedly connected by gluing.

Optionally, a reinforcing rib is arranged at the apron plate, and the reinforcing rib is arranged around the apron plate.

Optionally, the apron board is recessed towards the center of the apron board, the connecting plate extends towards the center of the apron board in the recessed area of the apron board to form a flat plate area connected with the lower end of the apron board, and the weak structure comprises the flat plate area.

Optionally, the flat plate region is located above the inner cavity of the box body.

Optionally, the number of the weak structures is multiple, and the weak structures are arranged around the upper end of the box body at intervals.

In addition, the present disclosure also provides a vehicle including the battery pack according to any one of the above.

Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:

the battery package that this disclosed embodiment provided includes upper cover and box, and the upper cover lid closes in the top of box, and the upper cover includes the apron, the skirtboard that the edge downwardly extending of edge along the apron formed and the connecting plate that the lower extreme outside extension of following the skirtboard formed, and the upper end laminating and sealing connection of connecting plate and box, and has weak structure between the upper end of connecting plate and box. When gas pressure in the box reached and predetermine pressure threshold value, can form the mouth that loses heart with weak structural damage between the upper end of connecting plate and box, can be quick to the inside pressure release that exhausts of battery package, avoid the emergence of thermal runaway phenomenon. And because weak structure sets up between the upper end of connecting plate and box, consequently when carrying out the pressure release to battery package inside, the exhaust direction does not face passenger cabin, can effectually prevent that the inside exhaust high temperature gas of battery package from entering into passenger cabin, avoids causing the influence to passenger's safety. This battery package is not setting up under the prerequisite of explosion-proof valve and relief valve, the emergence of avoiding the thermal runaway phenomenon that still can be timely, and has the advantage such as save cost, simple structure, the displacement is big, the security is high.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

Fig. 1 is a schematic structural view of a battery pack according to some embodiments of the present disclosure;

FIG. 2 is a schematic structural view of a weak structure according to some embodiments of the present disclosure;

FIG. 3 is a schematic structural view of a weakened structure according to further embodiments of the present disclosure;

fig. 4 is a schematic structural diagram of a battery pack according to another embodiment of the present disclosure;

FIG. 5 is a top view of FIG. 4;

fig. 6 is a partial sectional view taken along line C-C in fig. 5.

Wherein, 1, an upper cover; 101. a cover plate; 102. a skirt board; 103. a connecting plate; 2. a box body; 3. a weak structure; 3a, protruding weak structures; 3b, sinking the weak structure; 301a, an arch portion; 301b, a plate region; 4. a sealing strip; 4a, a bulge; 5. and (4) bolts.

Detailed Description

In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.

As shown in fig. 1, the embodiment of the present disclosure provides a battery pack, which includes an upper cover 1 and a box body 2, wherein the upper cover 1 covers the box body 2 to form a closed installation space together with the box body 2, a battery pack is installed in the installation space, and the battery pack can protect the battery pack to a certain extent and prevent the battery pack from being damaged due to road jolt. The upper cover 1 includes a cover plate 101, a skirt plate 102 formed to extend downward along an edge of the cover plate 101, and a connecting plate 103 formed to extend outward along a lower end of the skirt plate 102, wherein the cover plate 101 is a flat plate structure disposed in parallel with an upper end surface of the case 2. Connecting plate 103 is laminated and sealing connection with the upper end of box 2, and has weak structure 3 between the upper end of connecting plate 103 and box 2. When the gas pressure in box 2 reached and predetermine the pressure threshold value, can destroy weak structure 3, form the mouth that loses heart between the upper end of connecting plate 103 and box 2, can be quick carry out the pressure release of exhausting to battery package inside, avoid the emergence of thermal runaway phenomenon. And because weak structure 3 sets up between the upper end of connecting plate 103 and box 2, consequently when carrying out the pressure release to battery package inside, the exhaust direction does not face passenger's cabin, can effectually prevent that the inside exhaust high temperature gas of battery package from entering into passenger's cabin, avoids causing the influence to passenger's safety.

Specifically, in some embodiments of this disclosure, the width of connecting plate 103 equals with the thickness of box 2 or slightly is less than the thickness of box, and the lower surface of connecting plate 103 and the up end laminating of box 2 are sealed, and weak structure 3 sets up between the upper end of connecting plate 103 and box 2, is convenient for when battery package internal pressure was too big, form the mouth of losing heart between connecting plate 103 and box 2 and carry out the pressure release of exhausting.

Further, in some embodiments of the present disclosure, the connection plate 103 is connected to the box body 2 through the sealing strip 4, and the connection plate 103 and the box body 2 are fixed together through a fastener or the connection plate 103 and the box body 2 are fixed together through gluing.

As shown in fig. 1, the weak structures 3 may be in two forms, namely, a weak structure 3a and a weak structure 3b, which have different structures and can achieve the same pressure relief effect.

Specifically, as shown in fig. 2 and 3 in combination, in some embodiments of the present disclosure, the weak structure 3 is in the form of a raised weak structure 3a, wherein the raised weak structure 3a includes a raised portion 301a provided on the web 103 and a raised portion 4a provided on the sealing strip 4, and the raised portion 4a is provided corresponding to the raised portion 301 a. Specifically, the arch part 301a is formed by stamping or bending, at the position of the arch part 301a, the distance between the connecting plate 103 and the upper end face of the box body 2 is increased, the cross section of the sealing strip 4 is increased by the protrusion 4a on the sealing strip 4, and the sealing strip 4 is made of a soft material, so that the larger the cross section of the sealing strip 4 is, the larger the contact area with high-temperature gas is, the more easily the sealing strip is deformed and destroyed, and under the same gas pressure condition, the more easily the sealing strip is broken by the high-temperature high-pressure gas at the moment of thermal runaway, and a pressure relief opening is formed.

Further, in some embodiments of the present disclosure, the arch 301a extends from the inner edge of the web 103 to the outer edge of the web 103, where the inner and outer sides are aligned with the inner and outer sides of the housing 2. Therefore, when the protrusion 4a is broken by high-temperature and high-pressure gas at the moment of thermal runaway, a relief opening communicating the inside and outside of the case 2 is formed between the connection plate 103 and the upper end surface of the case 2.

Further, in some embodiments of the present disclosure, the surface of the protrusion 4a and the arch portion 301a are attached to each other, so that when the pressure is not released, the upper cover 1 and the box body 2 are attached to each other and sealed, and the closed environment of the battery pack is prevented from being damaged. Specifically, the shape of the protrusion 4a is matched with the shape of the arch 301a, and the size of the protrusion 4a is also matched with the size of the arch 301a, in some embodiments of the present disclosure, the protrusion 4a is in a compressed state inside the arch 301a, and it is required to ensure that the protrusion 4a also has a certain amount of compression, so as to achieve good sealing performance. The upper cover 1 is a thin-wall part, and the arch part 301a on the upper cover 1 can be stamped or molded according to the shape of the bulge 4a on the sealing strip 4.

Further, in some embodiments of the present disclosure, the protrusion 4a is provided integrally with the sealing tape 4 or fixedly connected by gluing. As shown in fig. 2, the protrusion on the sealing tape 4 is directly formed with the sealing tape through a foaming mold, or, as shown in fig. 3, the shape of the protrusion 4a is cut as required, and then the protrusion 4a is fixed with the sealing tape 4 by gluing. The material of the protrusion 4a is the same as that of the sealing strip 4, and is made of the same soft material, and the arrangement of the protrusion 4a increases the sectional area of the sealing strip 4, thereby reducing the strength of the sealing strip 4 at this position. The normal thickness of the weather strip 4 in the region where the protrusion 4a is not provided is generally 5mm, and the compressed thickness is 2.5mm, and the strength of the weather strip 4 is relatively good at this thickness, and the weather strip is not easily crushed.

Specifically, in some embodiments of the present disclosure, the sealing strip 4 is connected to the upper cover 1 and the box body 2 in two ways: one is that the material of sealing strip 4 adopts the foaming silica gel, and the upper surface of arch portion 301a compresses tightly, and the lower surface of sealing strip 4 bonds with the up end of box 2, sets up the bolt fastening point in arch portion 301a and the both sides of arch portion 4a, fixes sealing strip 4, upper cover 1 and box 2 together through bolt 5. The other sealing strip 4 can be made of sealant, and is directly bonded with the connecting plate 103 and the box body 2, and because the sealant has a fixing effect, bolt fixing points can be arranged on two sides of the arch part 301a and the bulge 4a or not. When bolt fixing points are arranged on the connecting plate 103 and the box body 2, generally, a first through hole is arranged on the connecting plate 103, a threaded hole is arranged at a position corresponding to the first through hole on the box body 2, and the bolt 5 penetrates through the first through hole from top to bottom and then is matched with the threaded hole to realize fastening.

The material of the upper cover 1 is generally metal, such as steel plate or aluminum plate, and may also be a composite material, in consideration of the requirement of reducing the weight of the battery pack, the material at the area of the connecting plate 103 and the cover plate 101 of the upper cover 1 may be made thinner, typically between 0.7mm and 1.2mm, and meanwhile, in order to ensure the strength of the upper cover 1, a reinforcing rib is generally disposed at the skirt plate 102 to avoid the deformation of the upper cover.

Further, in some embodiments of the present disclosure, the reinforcing ribs may be provided in a plurality of pieces spaced apart along the circumference of the skirt panel 102, or the reinforcing ribs may be in the form of a reinforcing plate matching the size and shape of the skirt panel 102, and the reinforcing ribs may be attached to the inner side wall or the outer side wall of the skirt panel 102 to increase the thickness and strength of the skirt panel 102.

As shown in fig. 4, 5 and 6, in other embodiments of the present disclosure, weak structure 3 may be provided in another form, for example, in some embodiments of the present disclosure, weak structure is provided as a concave weak structure 3b, specifically, skirt 102 may be concave toward the center of apron 101, and web 103 extends in the concave region of skirt 102 toward the center of apron 101 to form a flat plate region 301b connected to the lower end of skirt 102, where concave weak structure 3b includes flat plate region 301 b. The thickness of flat plate area 301b is equal to that of connecting plate 103, and most of the periphery of flat plate area 301b is surrounded by apron board 102 and strengthening rib, and the intensity around flat plate area 301b is all higher than flat plate area 301b, therefore, when the pressure in box 2 rises sharply, can prop flat plate area 301b and deform so that a pressure relief opening is formed between flat plate area 301b and box 2, so that internal gas is discharged from the pressure relief opening in time, and when the thermal phenomenon occurs, the damage to the battery pack caused by the ejected high-temperature high-pressure gas is avoided.

Further, in some embodiments of the present disclosure, the shape of the flat plate area 301b may be rectangular, triangular or other shapes, generally, the shape of the flat plate area 301b is configured to be rectangular, and the flat plate area 301b is configured to be integrally formed with the connecting plate 103, the skirt 102 and the cover plate 101.

Further, as shown in fig. 6, in some embodiments of the present disclosure, the flat plate area 301b is disposed corresponding to the inner cavity of the box body 2, that is, the lower portion of the flat plate area 301b corresponds to the inner cavity of the box body 2, so that the flat plate area is more easily deformed when receiving the internal pressure of the box body 2.

Further, in some embodiments of the present disclosure, the connecting plate 103 is fixedly connected to the upper end of the box 2 by fasteners, wherein two fasteners are respectively disposed on two sides of the flat plate region 301b, and the pressure threshold for deforming the flat plate region 301b can be controlled by adjusting the distance between the fasteners on two sides of the flat plate region 301b and the area of the flat plate region 301 b. In general, the larger the distance between the fasteners on both sides of the plate region 301b or the larger the area of the plate region 301b, the more easily the fastener is broken, and the smaller the pressure threshold value for deforming the plate region 301b, and in the same way, the smaller the distance between the fasteners on both sides of the plate region 301b or the smaller the area of the plate region 301b, the stronger the plate region 301b, the less easily the fastener is broken, and the larger the pressure threshold value for deforming the plate region 301 b.

Further, in some embodiments of the present disclosure, the number of the weak structures 3 may be plural, and a plurality of the weak structures 3 are spaced around the upper end of the box body. The plurality of weak formations 3 may all be formed as an arch 301a on web 103 and a projection 4a on sealing strip 4, or the plurality of weak formations 3 may all be formed as a dished flat region 301b of skirt 102, or may comprise a portion of the arch 301a formed on web 103 in cooperation with the projection 4a on sealing strip 4, and another portion in the form of a dished flat region 301b of skirt 102. The two convex weak structures 3a and the concave weak structures 3b can be arranged in a staggered manner, or one of the two structures can be arranged first and then the other structure can be arranged. The same technical effect can be realized to two kinds of weak structures 3, and the inside pressure release of battery package can be realized to the homoenergetic under the condition that does not set up explosion-proof valve.

In addition, weak structure 3 can also be a thickness attenuate or the region that intensity reduces, can guarantee promptly under certain battery package internal pressure effect that weak structure 3 is easy to be out of shape or damage to form the pressure release mouth, make the inside high temperature high-pressure gas who forms of battery package in time discharge from the pressure release mouth.

Further, in some embodiments of the present disclosure, a vehicle is further provided, where any one of the battery packs is applied to the vehicle, where the battery pack protects an internal battery assembly to prevent the battery assembly from colliding with or entering water.

To sum up, the battery package and vehicle that this disclosed embodiment provided, through set up weak structure between the upper end at connecting plate and box, just also through set up on the connecting plate hunch-up portion and set up on the sealing strip with hunch-up portion complex arch, with the sectional area of increase sealing strip, reduce the intensity of sealing strip in weak structure department, and then under equal pressure, make the sealing strip be destroyed the point easily and form the pressure release mouth between the upper end of connecting plate and box in the protruding department, in time release the inside high temperature high-pressure gas of battery package, avoid the emergence of thermal runaway phenomenon. Or through the mode with skirtboard and the inside sunken of strengthening rib, the inside extension of connecting plate forms dull and stereotyped region simultaneously, because dull and stereotyped region has increased the area of connecting plate in weak structure department, and intensity all is higher than dull and stereotyped region around dull and stereotyped region, consequently, under equal pressure, dull and stereotyped region is out of shape easily, and then forms the pressure release mouth in weak structure department, carries out timely pressure release to the inside high temperature high-pressure gas of battery package, avoids the emergence of thermal runaway phenomenon. The battery package of two kinds of forms that this disclosed embodiment provided, homoenergetic is under the condition that does not set up relief valve and explosion-proof valve, and timely discharges the high temperature high-pressure gas in the electric battery package, and the discharge direction does not face passenger cabin, has avoided causing the potential safety hazard to the passenger, and this battery package has cost saving, simple structure, the displacement is big and the security is high advantage such as.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The battery pack is characterized by comprising an upper cover (1) and a box body (2), wherein the upper cover (1) covers the box body (2), the upper cover (1) comprises a cover plate (101), a skirt plate (102) formed by downward extension along the edge of the cover plate (101) and a connecting plate (103) formed by outward extension along the lower end of the skirt plate (102), the connecting plate (103) is attached to and hermetically connected with the upper end of the box body (2), and a weak structure (3) is arranged between the connecting plate (103) and the upper end of the box body (2).

2. The battery pack according to claim 1, wherein the connecting plate (103) is hermetically connected to the case (2) by a sealing tape (4).

3. A battery pack according to claim 2, wherein the weak structure (3) comprises a raised portion (301a) provided on the connecting plate (103) and a protrusion (4a) provided on the sealing strip (4), the protrusion (4a) being arranged in abutment with the raised portion (301 a).

4. The battery pack according to claim 3, wherein the raised portion (301a) extends from an inner edge of the connecting plate (103) to an outer edge of the connecting plate (103).

5. A battery pack according to claim 3, wherein the protrusion (4a) is integrally formed with the sealing strip (4) or fixedly connected by gluing.

6. The battery pack according to claim 1 or 2, wherein a reinforcing rib is provided at the skirt (102), the reinforcing rib being provided around the skirt (102).

7. The battery pack according to claim 6, wherein the skirt (102) is recessed toward the center of the cap plate (101), and the connecting plate (103) extends in the central direction of the cap plate (101) at the recessed region of the skirt (102) to form a flat plate region (301b) connected to the lower end of the skirt (102), and the weak structure (3) includes the flat plate region (301 b).

8. The battery pack according to claim 7, wherein the flat plate region (301b) is located above an inner cavity of the case (2).

9. A battery pack according to claim 1, wherein the weak structures (3) are plural in number, and the plural weak structures (3) are provided at intervals around the upper end of the case (2).

10. A vehicle characterized by comprising the battery pack according to any one of claims 1 to 9.