CN220138599U - Battery pack lower box body and battery pack - Google Patents

Abstract

The utility model relates to the technical field of batteries and discloses a battery pack lower box body and a battery pack. The lower box body of the battery pack comprises a bottom plate and an outer frame, wherein the bottom plate is arranged at the bottom of the outer frame so as to jointly define an accommodating space with the outer frame, and the accommodating space is used for accommodating a battery module or a battery cell group; an exhaust channel is arranged in the outer frame, one side of the outer frame, which is close to the accommodating space, is provided with an air leakage hole, the exhaust channel is communicated with the accommodating space through the air leakage hole, and a blocking net is blocked on one side of the air leakage hole, which is close to the accommodating space. When thermal runaway, short circuit and other phenomena occur, high-temperature and high-pressure gas in the battery pack can be discharged into the exhaust channel from the gas discharge hole, so that the battery pack is prevented from being ignited and exploded due to expansion. The separation net can separate aluminum scraps in the exhaust channel of the outer frame, so that the aluminum scraps are prevented from entering the battery pack from the air leakage hole to cause short circuit or insulation fault and the like, and the high-temperature and high-pressure gas can be ensured to smoothly pass through, so that the safety of the battery pack is ensured.

Description

Battery pack lower box body and battery pack

Technical Field

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

Background

With the development of electric vehicles, a battery pack is used as a core component thereof for powering the electric vehicles. The battery pack generally includes a lower case, a battery module, and an upper cover, the battery module being accommodated inside the lower case, the upper cover being fastened to the lower case to separate the battery module from an external environment.

In the related art, in order to ensure the safety of the battery pack, the inner side surface of the outer frame of the lower box body is always provided with a vent hole, the outer side surface of the lower box body is provided with an explosion-proof valve, an exhaust channel is arranged in the outer frame, when phenomena such as thermal runaway and short circuit occur, high-temperature and high-pressure gas which rises sharply in the battery pack is discharged from the explosion-proof valve after passing through the vent hole and the exhaust channel in sequence from the inner part of the box body, so that the battery pack is prevented from being ignited and exploded due to expansion.

Secondly, lower box and upper cover need be through fastener locking, and the top of outline frame totally has more than 80 connecting holes, and these connecting holes need with the connecting hole one-to-one cooperation of upper cover, in order to guarantee the position accuracy of upper cover connecting hole, when the box under the production, outer frame and inside crossbeam all around are pieced together to welding first, then correspond the connecting hole of connecting hole on the outline frame through CNC processing upper cover's connecting hole. In the course of working, the aluminium bits that CNC drilling produced remain more or less and can drop in the connecting hole of outline and remain in the exhaust passageway, because exhaust passageway and bleeder hole intercommunication, consequently aluminium bits get into battery package inside through the bleeder hole and cause short circuit or insulation failure etc..

Accordingly, there is a need to provide a battery pack lower case and a battery pack to solve the above-described problems.

Disclosure of Invention

The utility model aims to provide a lower box body of a battery pack, which can effectively prevent aluminum scraps from entering the inside of the battery pack to cause short circuit or insulation faults and the like, and ensures the safety of the battery pack.

Another object of the present utility model is to provide a battery pack, which can ensure the safety of the battery pack by providing the lower case of the battery pack.

In order to achieve the purpose, the utility model is realized by the following technical scheme:

a battery pack lower case comprising:

the bottom plate is arranged at the bottom of the outer frame so as to jointly define an accommodating space with the outer frame, and the accommodating space is used for accommodating the battery module or the battery cell group;

an exhaust channel is arranged in the outer frame, a vent hole is formed in one side, close to the accommodating space, of the outer frame, the exhaust channel is communicated with the accommodating space through the vent hole, and a blocking net is blocked on one side, close to the accommodating space, of the vent hole.

As an alternative, the barrier net is constructed in a sheet structure, and the barrier net is made of a metal material.

As an alternative, a fixing plate is arranged on one side of the outer frame, which is close to the accommodating space, and covers the peripheral edge of the blocking net, so that the blocking net is pressed on the outer frame.

As an alternative, the fixing plate includes a fixing portion and a plurality of reinforcing portions, the fixing portion is configured to be an annular structure and cover the periphery of the barrier net, the reinforcing portions are arranged at intervals and are connected between the fixing portions, and the fixing portion and the reinforcing portions jointly define a plurality of hollows so as to avoid the barrier net.

As an alternative, the edge of the fixing plate is provided with a first mounting hole, the edge of the blocking net is provided with a second mounting hole, the outer frame is provided with a third mounting hole, and the fastening piece sequentially penetrates through the first mounting hole, the second mounting hole and the third mounting hole, so that the fixing plate and the blocking net are jointly fixed on the outer frame.

As an alternative, the fastener is a rivet.

As an alternative, a reinforcing plate is arranged inside the outer frame, the reinforcing plate divides the exhaust passage into a plurality of sub-exhaust passages which are distributed at intervals, and the air leakage holes are simultaneously communicated with a plurality of sub-exhaust passages.

As an alternative, the outer frame includes side beams and end beams, the side beams are disposed opposite to each other and are respectively connected between the two end beams, and a mounting beam is disposed at one side of the accommodating space of the side Liang Yuanli.

As an alternative, a transverse beam and/or a longitudinal beam are further arranged inside the accommodating space, the transverse beam is parallel to the end beam, the longitudinal beam is parallel to the side beams, the accommodating space is divided into a plurality of sub accommodating spaces by the transverse beam and/or the longitudinal beam, and each sub accommodating space is internally provided with the battery module.

The battery pack comprises an upper cover, a battery module and the battery pack lower box body, wherein the battery module is contained in the containing space of the battery pack lower box body, and the upper cover is buckled on the battery pack lower box body.

The beneficial effects of the utility model are as follows:

according to the lower box body of the battery pack, the air leakage hole is formed in one side, close to the accommodating space, of the outer frame, when phenomena such as thermal runaway and short circuit occur, high-temperature and high-pressure air which is rapidly raised in the battery pack can be discharged into the air exhaust channel from the air leakage hole, so that the battery pack is prevented from being ignited and exploded due to expansion. The blocking net is blocked on one side of the air leakage hole, which is close to the accommodating space, so that aluminum scraps in the air exhaust channel of the outer frame can be blocked, short circuit or insulation faults and the like caused by the fact that the aluminum scraps enter the battery pack from the air leakage hole are prevented, high-temperature and high-pressure air can be ensured to smoothly pass through, and the safety of the battery pack is ensured.

According to the battery pack, the lower box body of the battery pack is arranged, so that aluminum scraps can be prevented from entering the battery pack to cause short circuit, insulation faults and the like, and smooth pressure relief can be ensured, and the safety of the battery pack is further ensured.

Drawings

For a more obvious and understandable description of embodiments of the utility model or solutions according to the prior art, reference will be made to the accompanying drawings, which are used in the description of the embodiments or the prior art and which are examples of the utility model, and from which other drawings can be obtained without inventive effort for a person skilled in the art.

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

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is an exploded view at A in FIG. 1;

FIG. 4 is a side view of a side rail provided by an embodiment of the present utility model;

fig. 5 is a schematic structural view of a fixing plate according to an embodiment of the present utility model.

In the figure:

1. a bottom plate;

2. an outer frame; 21. side beams; 211. a vent hole; 212. a third mounting hole; 22. an end beam; 23. an exhaust passage; 231. a sub-exhaust passage; 24. a reinforcing plate; 25. mounting a beam;

3. an accommodation space;

4. a barrier web;

5. a fixing plate; 51. a fixing part; 511. a first mounting hole; 52. a reinforcing part; 53. hollow out;

6. a fastener; 7. a diaphragm; 8. mediastinum beams.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

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

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

This embodiment provides a battery package, including upper cover, battery module and battery package lower box, as shown in fig. 1, battery package lower box includes bottom plate 1 and outline 2, and bottom plate 1 sets up in the bottom of outline 2 to prescribe a limit to accommodation space 3 jointly with outline 2, battery module holds in accommodation space 3, in other embodiments, also can replace battery module for electric core group. The upper cover is buckled on the lower box body of the battery pack, so that the battery module can be separated from the external environment, the battery module is prevented from being damaged by external force impact or external foreign matter erosion, and the reliability of the battery pack is improved. Wherein, a plurality of connecting holes are arranged at the top of the outer frame 2, and corresponding connecting holes are also arranged at the positions of the upper cover corresponding to the connecting holes, for example, the connecting holes of the upper cover and the connecting holes of the lower box body are sequentially penetrated by fasteners such as rivets or screws, so as to fixedly connect the upper cover and the lower box body.

Specifically, as shown in fig. 1, the outer frame 2 includes two side rails 21 and two end rails 22, the two side rails 21 being disposed opposite to each other and connected between the two end rails 22, that is, the two side rails 21 and the two end rails 22 enclose an approximately square frame structure to limit movement of the battery module in the left-right direction and the front-rear direction.

Further, as shown in fig. 3 and 4, the side beams 21 and the end beams 22 are hollow structures, that is, the side beams 21 and the end beams 22 are respectively provided with an exhaust channel 23, one side of the side beam 21 close to the accommodating space 3 is provided with an air vent hole 211, the exhaust channel 23 is communicated with the accommodating space 3 through the air vent hole 211, so that high-temperature and high-pressure gas generated by thermal runaway of the battery module can flow into the exhaust channel 23 of the side beam 21 from the accommodating space 3 through the air vent hole 211, then flow into the exhaust channel 23 of the end beam 22 from the exhaust channel 23 of the side beam 21, and finally be discharged through an explosion-proof valve communicated with the end beam 22, thereby preventing the battery pack from being ignited and exploded due to expansion. In other embodiments, only the exhaust passage 23 may be provided on the end beam 22, and the vent hole 211 may be provided on the end beam 22, which is not limited herein.

It can be understood that, in order to ensure the position accuracy of the connecting hole on the upper cover, when the lower box body is produced, the peripheral outer frame 2 and the inner cross beam are welded in a splicing manner, and then the connecting hole of the upper cover is machined through CNC corresponding to the position of the connecting hole on the outer frame 2. In the processing process, aluminum scraps generated by CNC drilling are more or less dropped into the connecting holes of the outer frame 2 and remain in the exhaust channel 23 in the outer frame 2, and because the exhaust channel 23 is communicated with the air leakage holes 211, the aluminum scraps easily enter the inside of the battery pack through the air leakage holes 211 to cause short circuit or insulation faults and the like.

In order to solve the above-mentioned problem, referring to fig. 2 and 3, in this embodiment, a blocking net 4 is plugged at a side of the air release hole 211 near the accommodating space 3, and the blocking net 4 is a net structure with a plurality of densely distributed small holes thereon. The blocking net 4 can block aluminum scraps in the exhaust channel 23 of the outer frame 2, so that the aluminum scraps can be prevented from entering the battery pack from the air leakage hole 211 to cause short circuit or insulation fault and the like, and high-temperature and high-pressure air can be ensured to smoothly pass through, thereby ensuring the safety of the battery pack, and the battery pack is simple in structure and easy to realize.

Specifically, the barrier net 4 is constructed in a sheet-like structure, and the barrier net 4 is made of a metal material such as iron, aluminum, copper, or the like. By constructing the barrier net 4 into a sheet-shaped structure made of metal, the barrier net 4 is softer, is easy to bend and has better universality. Illustratively, as shown in fig. 2, since the inner side surface of the side sill 21 is configured with a step structure, when the barrier net 4 is installed, the barrier net 4 can be easily bent into a shape adapted to the step structure, so that the barrier net 4 can be completely attached to the inner surface of the side sill 21, and thus the air leakage hole 211 can be better blocked.

Further, as shown in fig. 2, a fixing plate 5 is disposed on one side of the outer frame 2 close to the accommodating space 3, the fixing plate 5 is configured into a bent shape matching with the shape of the blocking net 4, and the fixing plate 5 covers the peripheral edge of the blocking net 4 and is used for pressing the blocking net 4 onto the outer frame 2 so as to prevent the blocking net 4 from loosening. The fixing plate 5 may be made of metal such as iron, aluminum, copper, or plastic.

Specifically, as shown in fig. 5, the fixing plate 5 includes a fixing portion 51 and a plurality of reinforcing portions 52, the fixing portion 51 is configured as an annular structure and covers the peripheral edge of the barrier net 4, the plurality of reinforcing portions 52 are disposed at intervals and are connected between the fixing portions 51, and the fixing portion 51 and the plurality of reinforcing portions 52 together define a plurality of hollow-out portions 53 for avoiding the barrier net 4. The fixing portion 51 is mainly used for fixing the blocking net 4 on the side beam 21, the reinforcing portion 52 is mainly used for improving structural strength of the fixing plate 5, preventing deformation, and further preventing loosening of the blocking net 4.

Further, referring to fig. 2, 3 and 5, a first mounting hole 511 is formed at the edge of the fixing portion 51, a second mounting hole (not shown) is formed at the edge of the blocking net 4, a third mounting hole 212 is formed on the outer frame 2, and the fastening member 6 sequentially penetrates through the first mounting hole 511, the second mounting hole and the third mounting hole 212 to fix the fixing plate 5 and the blocking net 4 on the outer frame 2 together. By adopting such arrangement, the barrier net 4 and the fixing plate 5 are not required to be fixed respectively, the number of the fasteners 6 is reduced, the cost is saved, and the installation efficiency is improved. In this embodiment, the first mounting hole 511, the second mounting hole 212, the third mounting hole 212, and the fastener 6 are all provided in four, so that the reliability of connection can be ensured. In other embodiments, the first mounting holes 511, the second mounting holes, the third mounting holes 212 and the fastening members 6 may be provided in other numbers, and may be flexibly provided according to actual needs, which is not specifically limited herein.

Alternatively, the fastening member 6 is a rivet, by which the fixing plate 5 and the barrier net 4 can be riveted to the side sill 21. Compared with other fasteners 6, the rivet mounting mode is simpler, and the mounting efficiency is higher. In other embodiments, the fastener 6 may be a screw, a pin, or the like, which is flexibly set according to actual needs, and is not specifically limited herein.

Further, referring to fig. 4, the side sill 21 and the end sill 22 are internally provided with reinforcing plates 24, and the reinforcing plates 24 divide the exhaust passage 23 into a plurality of sub exhaust passages 231 spaced apart from each other, and the air release holes 211 are simultaneously communicated with the plurality of sub exhaust passages 231. The reinforcing plates 24 are arranged inside the side beams 21 and the end beams 22, so that not only the structural strength of the side beams 21 and the end beams 22 can be improved, but also the high-temperature and high-pressure gas among the plurality of sub-exhaust channels 231 arranged at intervals can be prevented from interfering with each other after the high-temperature and high-pressure gas enters the sub-exhaust channels 231, and the structural reliability and stability of the exhaust channels 23 can be improved. In the present embodiment, the reinforcing plate 24 is provided in two so as to partition the exhaust passage 23 into three sub-exhaust passages 231 which are spaced apart. In other embodiments, the reinforcing plate 24 may be provided in one, three or more, without limitation.

Further, as shown in fig. 1 and 4, each side sill 21 is provided with a mounting beam 25 on a side thereof away from the accommodation space 3. When the battery pack is mounted on the whole vehicle chassis, the mounting beam 25 is used for connecting with a mounting position on the whole vehicle chassis, so that the battery pack is fixed on the whole vehicle chassis. Wherein the mounting beam 25 and the side beam 21 are of an integrally formed construction, but are not in communication with the vent channel 23 in the side beam 21.

As shown in fig. 1, the accommodating space 3 is further provided therein with a diaphragm beam 7 and a mediastinum beam 8, the diaphragm beam 7 is disposed parallel to the end beam 22, the mediastinum beam 8 is disposed parallel to the side beam 21, and the diaphragm beam 7 and the mediastinum beam 8 are disposed in the outer frame 2 in a crossing manner to divide the accommodating space 3 into a plurality of sub-accommodating spaces 3, each of which sub-accommodating spaces 3 accommodates a battery module. When the battery module in a certain sub-accommodation space 3 has a height Wen Shihuo, the diaphragm beams 7 and the mediastinum beams 8 can space the sub-accommodation space 3 where the battery module with high temperature fire is located from the battery modules in other sub-accommodation spaces 3, and loss can be reduced. The number of the transverse beams 7 and the longitudinal beams 8 can be different, and the number of the transverse beams 7 and the longitudinal beams 8 can be adjusted according to specific requirements so as to improve the use flexibility. It should be noted that in some embodiments, only the diaphragm beam 7 may be provided, and in other embodiments, only the mediastinum beam 8 may be provided.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. A battery pack lower case, comprising:

the battery pack comprises a bottom plate (1) and an outer frame (2), wherein the bottom plate (1) is arranged at the bottom of the outer frame (2) so as to jointly define an accommodating space (3) with the outer frame (2), and the accommodating space (3) is used for accommodating a battery module or a battery cell group;

an exhaust passage (23) is arranged in the outer frame (2), one side, close to the accommodating space (3), of the outer frame (2) is provided with an air leakage hole (211), the exhaust passage (23) is communicated with the accommodating space (3) through the air leakage hole (211), and one side, close to the accommodating space (3), of the air leakage hole (211) is blocked with a blocking net (4).

2. The battery pack lower case according to claim 1, wherein the barrier net (4) is constructed in a sheet structure, and the barrier net (4) is made of a metal material.

3. The battery pack lower case according to claim 1, wherein a fixing plate (5) is provided on one side of the outer frame (2) close to the accommodating space (3), and the fixing plate (5) covers the peripheral edge of the barrier net (4) and is used for pressing the barrier net (4) onto the outer frame (2).

4. A battery pack lower case according to claim 3, wherein the fixing plate (5) comprises a fixing portion (51) and a plurality of reinforcing portions (52), the fixing portion (51) is configured into a ring structure and covers the periphery of the barrier net (4), the reinforcing portions (52) are arranged at intervals and are connected between the fixing portions (51), and the fixing portions (51) and the reinforcing portions (52) define a plurality of hollows (53) together so as to avoid the barrier net (4).

5. The battery pack lower box body according to claim 3, wherein a first mounting hole (511) is formed in the edge of the fixing plate (5), a second mounting hole is formed in the edge of the blocking net (4), a third mounting hole (212) is formed in the outer frame (2), and a fastener (6) sequentially penetrates through the first mounting hole (511), the second mounting hole and the third mounting hole (212) so as to fix the fixing plate (5) and the blocking net (4) on the outer frame (2) together.

6. The battery pack lower case according to claim 5, wherein the fastener (6) is a rivet.

7. The battery pack lower case according to any one of claims 1 to 6, wherein a reinforcing plate (24) is provided inside the outer frame (2), the reinforcing plate (24) partitions the exhaust passage (23) into a plurality of sub exhaust passages (231) which are spaced apart, and the vent hole (211) communicates with a plurality of the sub exhaust passages (231) at the same time.

8. The battery pack lower case according to any one of claims 1 to 6, wherein the outer frame (2) includes side beams (21) and end beams (22), the side beams (21) are disposed opposite to each other and connected between the two end beams (22), and a mounting beam (25) is disposed on a side of the side beams (21) away from the receiving space (3).

9. The battery pack lower case according to claim 8, wherein a diaphragm beam (7) and/or a mediastinum beam (8) is further provided inside the accommodation space (3), the diaphragm beam (7) is provided parallel to the end beam (22), the mediastinum beam (8) is provided parallel to the side beam (21), and the diaphragm beam (7) and/or the mediastinum beam (8) partition the accommodation space (3) into a plurality of sub-accommodation spaces each accommodating the battery module therein.

10. A battery pack, characterized by comprising an upper cover, a battery module and the battery pack lower box body according to any one of claims 1-9, wherein the battery module is accommodated in the accommodating space (3) of the battery pack lower box body, and the upper cover is buckled on the battery pack lower box body.