CN214203903U

CN214203903U - Battery package upper cover, battery package and vehicle

Info

Publication number: CN214203903U
Application number: CN202120510285.9U
Authority: CN
Inventors: 黄雄; 徐超
Original assignee: Beijing CHJ Automobile Technology Co Ltd
Current assignee: Beijing CHJ Automobile Technology Co Ltd
Priority date: 2021-03-10
Filing date: 2021-03-10
Publication date: 2021-09-14
Anticipated expiration: 2031-03-10

Abstract

The present disclosure relates to a battery pack upper cover, a battery pack, and a vehicle. Wherein the battery package upper cover includes: the upper cover body is provided with a weak structure, a center thinning groove and a side thinning groove of the weak structure, and the side thinning groove and the center thinning groove enclose a weak area together. When thermal runaway occurs in the battery pack, the mixture of high-temperature gas and particles formed in the battery pack can break through the weak area on the upper cover body to form an exhaust port, and the mixture of the high-temperature gas and the particles in the battery pack is discharged in time. The battery pack upper cover provided by the embodiment of the disclosure integrates the function of the battery pack explosion-proof valve into the upper cover body, avoids the installation of the explosion-proof valve, saves the cost, is not easy to block, has low opening pressure and has better exhaust effect. In addition, this disclosed embodiment improves to battery package upper cover body structure, does not occupy the other spaces of battery package, can use on any form of battery package upper cover, has very high commonality.

Description

Battery package upper cover, battery package and vehicle

Technical Field

The disclosure relates to the technical field of vehicles, in particular to a battery pack upper cover, a battery pack and a vehicle.

Background

The battery pack in the electric automobile 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 box body of the battery pack to serve as exhaust passages, but the explosion-proof valves have the problems of easy blockage, high opening pressure, limited exhaust capacity and the like, and the cost and the weight of the battery pack are increased.

Disclosure of Invention

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

The present disclosure provides a battery pack upper cover, including: the upper cover comprises an upper cover body, wherein a weak structure is arranged on the upper cover body and comprises a central thinning groove and side thinning grooves, and the side thinning grooves and the central thinning grooves are connected with each other to jointly enclose a weak area.

Optionally, the lateral thinning grooves include a first thinning groove and a second thinning groove, and the first thinning groove and the second thinning groove are respectively connected to two ends of the central thinning groove.

Optionally, the number of the side thinning grooves is plural, and the plural side thinning grooves are respectively provided at both sides of the central thinning groove.

Optionally, the first thinning groove comprises a first end thinning groove, and the second thinning groove comprises a second end thinning groove; the first end thinning groove and the central thinning groove form a first included angle alpha, the second end thinning groove and the central thinning groove form a second included angle beta, and preferably, the alpha is more than or equal to 90 degrees and less than or equal to 150 degrees, and the beta is more than or equal to 90 degrees and less than or equal to 150 degrees.

Optionally, the first thinning groove further includes a first auxiliary thinning groove, the second thinning groove further includes a second auxiliary thinning groove, the first auxiliary thinning groove is connected to an end of the first end thinning groove, the second auxiliary thinning groove is connected to an end of the second end thinning groove, and the second auxiliary thinning groove extends in a direction close to the first end thinning groove, and the first auxiliary thinning groove extends in a direction close to the second end thinning groove.

Optionally, the first auxiliary thinning groove and the second auxiliary thinning groove are arranged along the same straight line and do not intersect with each other; and/or one end of the first auxiliary thinning groove far away from the first end thinning groove and one end of the second auxiliary thinning groove far away from the second end thinning groove are both arc-shaped.

Optionally, the first thinning groove and the second thinning groove are symmetrically arranged about a perpendicular bisector of the central thinning groove.

Optionally, the upper cover body comprises a top plate and a side plate,

the weak structure is formed on the side plate;

or, the top plate is upwards protruded to form a protruding structure, and the weak structure is formed on the side wall of the protruding structure.

The present disclosure also provides a battery pack, which includes a box body and the battery pack upper cover as described in any one of the above, wherein the battery pack upper cover is covered on the box body.

The present disclosure also provides a vehicle including the above battery pack.

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

the battery pack upper cover comprises an upper cover body, wherein a weak structure is arranged on the upper cover body, namely a central thinning groove and a side thinning groove, and a weak area is defined by the side thinning groove and the central thinning groove. When thermal runaway occurs in the battery pack, the mixture of high-temperature gas and particles formed in the battery pack can break through the weak area on the upper cover body to form an exhaust port, and the mixture of the high-temperature gas and the particles in the battery pack is discharged in time. The battery pack upper cover provided by the embodiment of the disclosure integrates the function of the battery pack explosion-proof valve into the upper cover body, avoids the installation of the explosion-proof valve, saves the cost, is not easy to block, has low opening pressure and has better exhaust effect. In addition, this disclosed embodiment improves to battery package upper cover body structure, does not occupy the other spaces of battery package, can use on any form of battery package upper cover, has very high commonality.

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 diagram of a battery pack according to an embodiment of the present disclosure;

FIG. 2 is a schematic structural diagram of a weak structure according to an embodiment of the disclosure;

figure 3 is a cross-sectional view of a weakened structure according to an embodiment of the disclosure.

Wherein, 1, an upper cover body; 2. a weak structure; 3. a box body; 101. a top plate; 102. a side plate; 103. a raised structure; 201. a center thinning groove; 202. a first thinning groove; 203. a second thinning groove; 202a, a first end thinning groove; 202b, a first auxiliary thinning groove; 203a, a second end thinning groove; 203b, second auxiliary thinning groove.

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.

An explosion-proof valve is usually installed on a battery pack at present to solve the problem of rapid exhaust of the battery pack due to thermal runaway, and the existing explosion-proof valve generally has the problems of easy blockage, high opening pressure and limited exhaust capacity. In order to solve the above problems, the present disclosure provides a battery pack upper cover, which performs material reduction processing on the battery pack upper cover to make a battery pack upper cover body have the same function as an explosion-proof valve.

Specifically, as shown in fig. 1, 2 and 3, an upper cover of a battery pack provided by an embodiment of the present disclosure includes an upper cover body 1, a weak structure 2 is provided on the upper cover body 1, and the weak structure 2 includes a central weakening groove 201 and side weakening grooves, and the side weakening grooves and the central weakening groove are connected to each other to jointly enclose a weakening area. The central thinning groove 201 and the lateral thinning grooves are both groove structures which are formed on the upper cover body 1 through material reduction treatment and have thicknesses smaller than those of other areas, the groove structures after the material reduction treatment are easy to break when receiving external force impact, so that the weak areas are separated from the upper cover body 1, and exhaust ports communicated with the interior of the battery pack are formed in the positions of the weak areas. When taking place thermal runaway in the battery package, the weak area breaks away from with upper cover body 1 under the impact of battery package inside gas pressure, forms the gas vent, and the gas in the battery package is discharged from gas vent department, has reduced the risk that electric core thermal runaway leads to whole package thermal diffusion fast.

Specifically, in some embodiments of the present disclosure, the lateral thinning groove includes a first thinning groove 202 and a second thinning groove 203, the first thinning groove 202 and the second thinning groove 203 are respectively connected to two ends of the central thinning groove 201, and the first thinning groove 202, the second thinning groove 203 and the central thinning groove 201 together define a weakening area. The first and second thinning

grooves

202 and 203 are respectively provided at both ends of the central thinning groove 201, and define the specific shape of the weak area, and the lengths of the first and second thinning

grooves

202 and 203 and the central thinning groove 201 define the size of the weak area.

Further, the number of the side thinning grooves is plural, and the plural side thinning grooves are respectively provided on both sides of the central thinning groove, where the plural includes two or more, and the plural side thinning grooves may be symmetrically provided on both sides of the central thinning groove 201 or may be staggered. Specifically, taking the number of the side thinning grooves as two as an example, as shown in fig. 1, 2 and 3, the two side thinning grooves are respectively disposed at two sides of the central thinning groove 201, more specifically, the two side thinning grooves are symmetrically disposed about a center line of the central thinning groove 201, and the first thinning groove 202 and the second thinning groove 203 are respectively connected to two ends of the central thinning groove 201, that is, a weakening area is respectively defined at two sides of the central thinning groove 201.

The battery pack upper cover provided by the embodiment of the disclosure integrates the function of the battery pack explosion-proof valve into the upper cover body 1, avoids the installation of the explosion-proof valve, saves the cost, is not easy to block, has low opening pressure and has better exhaust effect. In addition, this disclosed embodiment carries out the material reduction to battery package upper cover body 1 and handles, does not occupy the other spaces of battery package, can use on any form of battery package upper cover, has very high commonality.

Further, as shown in FIG. 2, in some embodiments of the present disclosure, the first thinning groove 202 includes a first end thinning groove 202a, and the second thinning groove 203 includes a second end thinning groove 203a, the first end thinning groove 202a forms a first included angle α of 90 ≦ α ≦ 150 ° with the central thinning groove 201, and the second end thinning groove 203a forms a second included angle β of 90 ≦ β ≦ 150 ° with the central thinning groove 201. Specifically, as shown in fig. 1 and 2, in some embodiments of the present disclosure, a first end thinning groove 202a is provided at a left end of the center thinning groove 201, a second end thinning groove 203a is provided at a right end of the center thinning groove 201, and two first end thinning grooves 202a symmetrical with respect to the center thinning groove 201 collectively form a V-shape with an opening facing left, and two second end thinning grooves 203a symmetrical with respect to the center thinning groove 201 collectively form a V-shape with an opening facing right. Thus, a pointed structure is formed at the intersection of the center thinning groove 201 and the first and second end thinning grooves 202a and 203a, and the pointed structure is likely to cause stress concentration and to break when receiving a low impact force.

It should be noted that the first angle α and the second angle β may be greater than 0 degrees and smaller than 90 degrees, that is, a V-shape with a right opening at the left end and a V-shape with a left opening at the right end may be formed, and a pointed structure may be formed at a position where the central thinning groove 201 intersects with the first end thinning groove 202a and the second end thinning groove 203 a. In the embodiment of the present disclosure, the specific values of the angles of the first included angle α and the second included angle β are related to the material and the thickness of the upper cover body, and the parameters of the central thinning groove 201 and the first end thinning groove 202a and the second end thinning groove 203a, and can be appropriately adjusted in actual production.

Further, in some embodiments of the present disclosure, the first thinning groove 202 further includes a first auxiliary thinning groove 202b, the second thinning groove 203 further includes a second auxiliary thinning groove 203b, the first auxiliary thinning groove 202b is connected to an end of the first end thinning groove 202a, the second auxiliary thinning groove 203b is connected to an end of the second end thinning groove 203a, and the second auxiliary thinning groove 203b extends in a direction close to the first end thinning groove 202a, and the first auxiliary thinning groove 202b extends in a direction close to the second end thinning groove 203 a. Specifically, as shown in fig. 1 and 2, both ends of the first end portion thinning groove 202a are connected to the central thinning groove 201 and the first auxiliary thinning groove 202b, both ends of the second end portion thinning groove 203a are connected to the central thinning groove 201 and the second auxiliary thinning groove 203b, and the first auxiliary thinning groove 202b and the second auxiliary thinning groove 203b are provided to make the connection portion of the weakened area and the upper cover body 1 shorter, thereby increasing the possibility that the weakened area is separated from the upper cover body 1.

Further, in some embodiments of the present disclosure, the first auxiliary thinning groove 202b and the second auxiliary thinning groove 203b are disposed along the same straight line and do not intersect with each other, so that a hinge connecting the weak region and the upper cover body 1 is formed between the first auxiliary thinning groove 202b and the second auxiliary thinning groove 203b, and the hinge is not thinned or weakened, so as to maintain the original thickness of the upper cover body 1, that is, when the weak region is impacted by gas inside the battery pack and separated from the upper cover body 1, the weak region is connected with the upper cover body 1 through the hinge, thereby preventing the weak region from being completely separated from the upper cover body 1, and flying out to impact components around the battery pack under the action of the gas impact force, and further improving the safety of use.

Specifically, as shown in fig. 1 and 2, the first auxiliary thinning groove 202b and the second auxiliary thinning groove 203b are both parallel to the central thinning groove 201, so that a sharp-angled structure is formed at the joint of the first auxiliary thinning groove 202b and the first end thinning groove 202a, and a sharp-angled structure is formed at the joint of the second auxiliary thinning groove 203b and the second end thinning groove 203a, so that stress concentration is likely to occur in the sharp-angled structure, and the sharp-angled structure is more likely to break when thermal runaway occurs inside the battery pack.

Further, in some embodiments of the present disclosure, the first thinning groove 202 and the second thinning groove 203 are symmetrically disposed about a perpendicular bisector of the central thinning groove 201. Specifically, as shown in fig. 2, two first thinning grooves 202 symmetrical with respect to the central thinning groove 201 form an M-shaped structure with an opening facing right, and two second thinning grooves 203 symmetrical with respect to the central thinning groove 201 form an M-shaped structure with an opening facing left. At each connection of the first thinning groove 202, the second thinning groove 203 and the central thinning groove 201, no arc transition is made, and the arc transition is used as a stress concentration point and is more easily broken by impact force.

Further, in some embodiments of the present disclosure, both the end of the first auxiliary thinning groove 202b away from the first end thinning groove 202a and the end of the second auxiliary thinning groove 203b away from the second end thinning groove 203a are arc-shaped, that is, arc transition is performed, where stress concentration is eliminated, and fracture at the hinge is avoided, which leads to the flying out of the weak area.

Further, the upper cover body 1 includes a top plate 101 and a side plate 102, the side plate 102 is disposed around the edge of the top plate to form a skirt at the edge of the top plate 101, in some embodiments of the present disclosure, the weak structure 2 is disposed on the side plate, so that when the weak structure 2 breaks under the impact of gas in the battery pack, high-temperature gas of the battery pack is discharged from the side of the upper cover because the upper side of the upper cover is generally a passenger compartment, and if the weak structure 2 is disposed on the top surface of the upper cover, the discharged high-temperature gas easily enters the passenger compartment, which causes a safety hazard. According to the upper cover body 1 provided by the embodiment of the disclosure, the weak structure 2 is arranged on the side plate 102, so that the potential safety hazard that high-temperature gas directly enters a passenger compartment is solved.

In addition, the side plate 102 of the upper cover of some battery packs is relatively small in area, and the weak structure 2 cannot be reasonably arranged, for this case, an upward-protruding structure 103 may be arranged on the top plate 101 of the upper cover body 1, the protruding structure 103 is a hollow shell structure with the thickness equal to that of the upper cover body 1, and the protruding structure 103 may be formed on the top plate 101 of the upper cover body 1 in a direction form of stamping. And the weak structure 2 is arranged on the side wall of the convex structure 103, which also has the effect of preventing high-temperature gas from entering the passenger compartment.

Further, in some embodiments of the present disclosure, the number of the weak structures 2 is multiple, and the plurality of weak structures 2 are arranged at intervals, so that the number, the shape and the size of the weak structures 2 can be reasonably arranged according to the actual needs of the battery pack. The embodiment of the present disclosure does not specifically limit the specific number, shape and size of the weak structures 2, and it should be clear to those skilled in the art that the number, shape and size of the weak structures 2 may be reasonably adjusted as long as the weak structures can be separated from the upper cover body 1 by the impact force inside the battery pack.

As used herein, the term "plurality" refers to two or more than two.

Furthermore, the central thinning groove 201 and the side thinning grooves may be processed in various manners, such as processing weakening, laser weakening, hot knife weakening, cold knife weakening, injection weakening, and the like. In addition, in order to further facilitate the separation of the central thinning groove 201 and the lateral thinning grooves from the upper lid body 1, the central thinning groove 201 and the lateral thinning grooves may be formed on the inner side surface of the upper lid body 1, or may be formed on both the inner side surface and the outer side surface of the upper lid body 1.

Further, as shown in fig. 3, the residual thickness L of the central thinning groove 201 and the lateral thinning grooves (i.e. the thickness of the central thinning groove 201 and the lateral thinning grooves after the thinning-weakening process) may be determined according to the material selected for the upper cover, if the upper cover is made of a softer material, the residual thickness may be thicker, and if the strength of the upper cover is higher, the residual thickness L may be made thinner. Considering the factors of processing precision, air tightness detection requirement, packaging and transportation, etc., the residual thickness L of the central thinning groove 201 and the side thinning grooves can be adjusted between 0.1mm and 1mm, and finally the effect to be achieved is to reduce the burst pressure of the central thinning groove 201 and the side thinning grooves.

Further, some embodiments of this disclosure still provide a battery package, including box 3 and foretell battery package upper cover, battery package upper cover lid is established on box 3, encapsulates electric core in box 3, and when electric core took place the thermal runaway, weak structure 2 that the battery package upper cover broke away from with upper cover body 1 fast, formed the gas vent, with the high-temperature gas exhaust battery package that electric core thermal runaway produced, avoid high-temperature gas to spread in the battery package.

Still further, some embodiments of the present disclosure provide a vehicle including the above battery pack.

To sum up, the battery package upper cover that this disclosed embodiment provided sets up weak structure 2 on upper cover body 1, with the function integration of battery package explosion-proof valve to upper cover body 1 on, avoided the installation explosion-proof valve, not only practiced thrift out the cost, difficult jam moreover, opening pressure is low, exhaust effect is better. In addition, this disclosed embodiment carries out the material reduction to battery package upper cover body 1 and handles, does not occupy the other spaces of battery package, can use on any form of battery package upper cover, has very high commonality. When the inside thermal runaway that takes place of battery package, the weak structure 2 on the upper cover body 1 can be broken through to the inside high-temperature gas who forms of battery package and the mixture of granule forms the gas vent, in time discharges the inside high-temperature gas of battery package and the mixture of granule, has avoided because of the high-temperature gas that the thermal runaway produced spreads in battery package inside, causes the damage to electric core, has improved the security performance of battery package.

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. A battery pack upper cover, comprising: the upper cover comprises an upper cover body (1), wherein a weak structure (2) is arranged on the upper cover body (1), the weak structure (2) comprises a central thinning groove (201) and side thinning grooves, and the side thinning grooves and the central thinning grooves are connected with each other to jointly enclose a weak area.

2. The battery pack upper cover according to claim 1, wherein the side thinning groove comprises a first thinning groove (202) and a second thinning groove (203), and the first thinning groove (202) and the second thinning groove (203) are respectively connected to both ends of the central thinning groove (201).

3. The battery pack upper cover according to claim 1 or 2, wherein the number of the side thinning grooves is plural, and the plural side thinning grooves are provided on both sides of the center thinning groove.

4. The battery pack cover according to claim 2, wherein the first thinning groove (202) comprises a first end thinning groove (202a), and the second thinning groove (203) comprises a second end thinning groove (203 a); the first end thinning groove (202a) and the central thinning groove (201) form a first included angle alpha therebetween, and the second end thinning groove (203a) and the central thinning groove (201) form a second included angle beta therebetween.

5. The battery pack upper cover according to claim 4, wherein the first thinning groove (202) further comprises a first auxiliary thinning groove (202b), the second thinning groove (203) further comprises a second auxiliary thinning groove (203b), the first auxiliary thinning groove (202b) is connected to an end of the first end thinning groove (202a), the second auxiliary thinning groove (203b) is connected to an end of the second end thinning groove (203a), and the second auxiliary thinning groove (203b) extends in a direction close to the first end thinning groove (202a), and the first auxiliary thinning groove (202b) extends in a direction close to the second end thinning groove (203 a).

6. The battery pack upper cover according to claim 5, wherein the first auxiliary thinning groove (202b) and the second auxiliary thinning groove (203b) are arranged along the same line and do not intersect with each other;

and/or both the end of the first auxiliary thinning groove (202b) far away from the first end thinning groove (202a) and the end of the second auxiliary thinning groove (203b) far away from the second end thinning groove (203a) are arc-shaped.

7. The battery pack upper cover according to claim 2, wherein the first thinning groove (202) and the second thinning groove (203) are symmetrically disposed about a perpendicular bisector of the central thinning groove (201).

8. The battery pack upper cover according to claim 1, wherein the upper cover body (1) includes a top plate (101) and a side plate (102),

the weak structure (2) is formed on the side plate (102);

or, a convex structure (103) is formed on the top plate (101) in an upward protruding mode, and the weak structure (2) is formed on the side wall of the convex structure (103).

9. A battery pack, characterized in that it comprises a case and a battery pack cover according to any one of claims 1 to 8, said battery pack cover being provided on said case (3).

10. A vehicle characterized by comprising the battery pack according to claim 9.