CN220138605U - Battery pack - Google Patents

Abstract

The utility model relates to the technical field of lithium batteries, in particular to a battery pack, which comprises a shell, a battery cell module, a bottom guard plate and a reinforcing rib plate, wherein an accommodating space for accommodating the battery cell module is formed by surrounding the shell and the bottom guard plate. The reinforcing rib plate comprises at least one reinforcing rib, the reinforcing rib is attached to the bottom guard plate, and the reinforcing rib protrudes towards one side opposite to the bottom guard plate, so that an exhaust passage is formed between the reinforcing rib and the bottom guard plate in a surrounding mode. The bottom of electricity core module is provided with at least one row of first explosion-proof valve, and electricity core module sets up in deep floor, every the protruding muscle of strengthening corresponds the setting with one row of first explosion-proof valve. The housing includes an exhaust portion, and the first explosion-proof valve communicates with the exhaust portion via an exhaust passage. According to the battery pack, the pressure release gas discharged through the first explosion-proof valve is prevented from impacting the battery cell module, and the electrical connection stability of the battery cell module is ensured; the pressure release gas can be directly discharged to the exhaust part through the exhaust channel, so that the discharge speed of the pressure release gas is improved.

Description

Battery pack

Technical Field

The utility model relates to the technical field of lithium batteries, in particular to a battery pack.

Background

With the rise of new energy automobiles, the design of a battery pack is strived for, and the safety design of the battery pack has become a hot problem in current research, wherein the most popular topic is the thermal runaway safety of the battery pack.

In this regard, traditional electric core explosion-proof valve all sets up at electric core module's top or lateral part, and battery package top or lateral part do not set up independent exhaust passage and supply gas circulation, and the gas of large tracts of land in the battery package can not only influence battery module's utmost point post, and electric core explosion-proof valve exhaust gas discharges to the outside speed of battery package slower.

Therefore, the existing battery pack structure not only does not realize thermoelectric separation, but also is slow in exhaust.

Disclosure of Invention

The utility model aims to provide a battery pack, which solves the technical problems that the prior battery pack structure in the prior art is not capable of realizing thermoelectric separation and is slow in exhaust to a certain extent.

According to a first aspect of the utility model, there is provided a battery pack comprising a housing, a battery cell module, a bottom guard plate and a reinforcing rib plate, wherein the housing and the bottom guard plate enclose an accommodating space for accommodating the battery cell module;

the reinforcing rib plate comprises at least one reinforcing convex rib, the reinforcing rib is attached to the bottom guard plate, and the reinforcing convex rib protrudes towards one side opposite to the bottom guard plate, so that an exhaust channel is formed between the reinforcing convex rib and the bottom guard plate in a surrounding mode;

the bottom of the battery cell module is provided with at least one row of first explosion-proof valves, the battery cell module is arranged on the reinforcing rib plate, and each reinforcing rib is correspondingly arranged with one row of first explosion-proof valves;

the housing includes an exhaust portion, and the first explosion-proof valve communicates with the exhaust portion via the exhaust passage.

Preferably, the reinforcing rib plate comprises a plurality of reinforcing ribs arranged at intervals along a first direction, each reinforcing rib extends along a second direction, and the second direction is perpendicular to the first direction;

the reinforcing ribs are provided with ventilation parts, and the first explosion-proof valve is communicated with the exhaust channel through the ventilation parts;

each reinforcing convex rib is provided with two supporting bars extending along the second direction, the ventilation part is arranged between the two supporting bars, and the cell module is arranged on the reinforcing convex ribs through the supporting bars.

Preferably, the reinforcing rib plate further comprises a plate body part, a plurality of reinforcing ribs are connected through the plate body part, and the reinforcing rib plate is attached to the bottom guard plate through the plate body part;

the battery pack further comprises a sealant layer arranged between the plate body part and the bottom guard plate.

Preferably, the shell further comprises a front side beam, a rear side beam, an air passing cross beam and two side beams, wherein the rear side beam and the air passing cross beam extend along the first direction, the side beams extend along the second direction, first ends of the two side beams are respectively connected with two ends of the front side beam, second ends of the two side beams are respectively connected with two ends of the rear side beam, and the second direction is perpendicular to the first direction;

the gas passing cross beam comprises a first containing cavity extending along the first direction, the side beam comprises a second containing cavity extending along the second direction, the exhaust part is arranged on the rear side beam, and the exhaust channel is communicated with the exhaust part sequentially through the first containing cavity and the second containing cavity.

Preferably, the reinforcing rib further comprises a communication hole communicated with the exhaust passage, the gas passing cross beam is covered above the communication hole, and the exhaust passage is communicated with the first accommodating cavity through the communication hole.

Preferably, the ventilation part comprises a plurality of ventilation holes arranged at intervals along the second direction, and the plurality of ventilation holes included in each reinforcing rib are in one-to-one correspondence with the plurality of first explosion-proof valves in the corresponding row.

Preferably, the cell module comprises a plurality of cell modules arranged side by side along a first direction, each cell module comprises a plurality of cells stacked along the second direction, and poles of the cells are arranged on end faces of the cells in the first direction.

Preferably, the battery pack further comprises a longitudinal beam extending along the second direction, the longitudinal beam divides the accommodating space into a plurality of accommodating parts, and each accommodating part is correspondingly provided with one battery cell assembly.

Preferably, the battery cell further comprises a second explosion-proof valve, and the second explosion-proof valve is arranged on the end face of the battery cell in the first direction;

the longitudinal beam comprises a third containing cavity and a first air passing hole, the third containing cavity extends along the second direction, the first air passing hole is arranged on two sides of the longitudinal beam opposite to each other in the first direction, and a second explosion-proof valve of the battery cell facing the longitudinal beam is correspondingly arranged with the first air passing hole;

the side beam further comprises a second air passing hole, the second air passing hole is formed in the inner side of the side beam, and a second explosion-proof valve of the battery cell facing the side beam is arranged corresponding to the second air passing hole.

Preferably, the battery cell module further comprises a front beam and a rear beam which both extend along the first direction, and the battery cell module is arranged between the front beam and the rear beam;

the rear cross beam further comprises a fourth containing cavity and an exhaust hole, wherein the fourth containing cavity and the exhaust hole extend along the first direction, and the second containing cavity and the third containing cavity are communicated with the exhaust part sequentially through the fourth containing cavity and the exhaust hole.

Compared with the prior art, the utility model has the beneficial effects that:

according to the battery pack, the first explosion-proof valve is communicated with the exhaust channel surrounded by the reinforcing ribs and the bottom guard plate, so that the space formed by the surrounding of the reinforcing ribs and the bottom guard plate is used as an independent exhaust channel, and when the air pressure in the battery cell module exceeds a threshold value, the pressure release gas can be flushed out of the first explosion-proof valve and discharged into the exhaust channel, so that on one hand, the pressure release gas discharged through the first explosion-proof valve is effectively prevented from impacting the battery cell module, and the electrical connection stability of the battery cell module is ensured; on the other hand, the pressure release gas can be directly discharged to the exhaust part through the exhaust passage, so that the exhaust speed of the pressure release gas is effectively improved.

In order to make the above objects, features and advantages of the present utility model more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

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

FIG. 2 is a schematic structural view of a reinforcing rib plate mounted on a bottom guard plate according to an embodiment of the present utility model;

FIG. 3 is a side view of FIG. 2;

FIG. 4 is an enlarged schematic view of the structure at A of FIG. 3;

fig. 5 is a schematic structural diagram of a cell module according to an embodiment of the present utility model.

Reference numerals:

100-a housing; 200-cell module; 201-a cell assembly; 2011-a first explosion valve; 2012-a second explosion valve; 300-bottom guard board; 400-reinforcing rib plates; 401-reinforcing ribs; 4011-vent holes; 4012-a communication hole; 402-plate section; 500-a sealant layer; 601-an exhaust section; 602-front side beams; 603-a rear side beam; 604-a cross-ventilation beam; 605-side rails; 6051-second gas passing holes; 700-front cross beam; 800-a rear cross beam; 801-exhaust holes; 900-stringers; 901-a first air passing hole; 1000-cooling plates;

x-a first direction; y-a second direction; z-third direction.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown.

The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model.

All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between 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.

A battery pack according to some embodiments of the present utility model is described below with reference to fig. 1 to 5.

Referring to fig. 1 to 5, an embodiment of the present utility model provides a battery pack including a case 100, a battery cell module 200, a bottom guard plate 300, and a reinforcing rib 400, the case 100 and the bottom guard plate 300 enclosing a receiving space for receiving the battery cell module 200. The reinforcing rib plate 400 comprises a plurality of reinforcing ribs 401 which are arranged at intervals along the first direction X, the reinforcing rib plate 400 is attached to the bottom guard plate 300, and the reinforcing ribs 401 protrude towards one side opposite to the bottom guard plate 300, so that an exhaust passage is formed between the reinforcing ribs 401 and the bottom guard plate 300 in a surrounding mode. The bottom of the electric core module 200 is provided with a plurality of rows of first explosion-proof valves 2011, the electric core module 200 is arranged on the reinforcing rib plate 400, and the plurality of reinforcing ribs 401 are arranged in one-to-one correspondence with the plurality of rows of first explosion-proof valves 2011. The housing 100 includes an exhaust portion 601, and the first explosion-proof valve 2011 communicates with the exhaust portion 601 via an exhaust passage.

According to the technical characteristics, the first explosion-proof valve 2011 is communicated with the exhaust channel surrounded by the reinforcing ribs 401 and the bottom guard plate 300, so that the space formed by surrounding by the reinforcing ribs 401 and the bottom guard plate 300 is used as an independent exhaust channel, and when the air pressure in the battery cell module 200 exceeds a threshold value, the pressure release gas can be flushed out of the first explosion-proof valve 2011 and discharged into the exhaust channel, so that on one hand, the impact of the pressure release gas discharged through the first explosion-proof valve 2011 on the battery cell module 200 is effectively avoided, and the electrical connection stability of the battery cell module 200 is ensured; on the other hand, the pressure release gas can be directly discharged to the exhaust portion 601 through the exhaust passage, effectively increasing the exhaust speed of the pressure release gas.

Referring to fig. 1, X illustrates an example of a first direction, Y illustrates an example of a second direction, and Z illustrates an example of a third direction. Preferably, any two of the first direction X, the second direction Y, and the third direction Z are perpendicular. Wherein the third direction Z may be parallel to the direction of gravity when the battery pack is in use.

Preferably, as shown in fig. 1 and 2, the reinforcing bead 401 extends in the second direction Y, the reinforcing bead 401 is provided with a vent portion, and the first explosion proof valve 2011 communicates with the exhaust passage via the vent portion. Each reinforcing rib 401 is provided with two supporting bars extending along the second direction Y, the ventilation part is arranged between the two supporting bars, and the battery cell module 200 is arranged on the reinforcing ribs 401 through the supporting bars, so that the first explosion-proof valve 2011 and the exhaust channel are effectively sealed through the two supporting bars arranged on the two sides of the ventilation part, the situation that the pressure release gas exhausted by the first explosion-proof valve 2011 can completely enter the exhaust channel is avoided, and the completeness of electrothermal separation is further improved.

Preferably, as shown in fig. 1, the ventilation portion may include a plurality of ventilation holes 4011 arranged at intervals along the second direction Y, and the plurality of ventilation holes 4011 included in each reinforcing rib 401 are in one-to-one correspondence with the plurality of first explosion-proof valves 2011 in the corresponding row, so that each explosion-proof valve can be communicated with the exhaust channel, and pressure release smoothness of each first explosion-proof valve 2011 is ensured.

Optionally, the supporting strip may be supporting foam, and under the elastic effect of the supporting foam, the phenomenon that the pressure release gas enters the accommodating space due to vibration of the battery cell module 200 at the position where the pressure release gas is released when the pressure release gas rushes out of the first explosion-proof valve 2011 is effectively avoided.

Preferably, as shown in fig. 4, the reinforcing rib 400 may further include a plate portion 402, the plurality of reinforcing ribs 401 are connected via the plate portion 402, and the reinforcing rib 400 is attached to the bottom guard 300 via the plate portion 402. The battery pack may further include a sealant layer 500 disposed between the plate base 402 and the bottom guard 300, thereby further improving the air tightness of the exhaust passage and preventing the release of the pressure release gas in the exhaust passage through the gap between the plate base 402 and the bottom guard 300.

Preferably, as shown in fig. 1, the housing 100 may further include a front side beam 602, a rear side beam 603, an air passing beam 604, and two side beams 605, wherein the rear side beam 603 and the air passing beam 604 extend along the first direction X, the side beams 605 extend along the second direction Y, first ends of the two side beams 605 are respectively connected with two ends of the front side beam 602, and second ends of the two side beams 605 are respectively connected with two ends of the rear side beam 603. The gas passing cross beam 604 comprises a first cavity extending along a first direction X, the side beam 605 comprises a second cavity extending along a second direction Y, the exhaust part 601 is arranged on the rear side beam 603, and the exhaust channel is communicated with the exhaust part 601 sequentially through the first cavity and the second cavity.

Preferably, as shown in fig. 2, the reinforcing rib 401 further includes a communication hole 4012 that communicates with the exhaust channel, the gas passing beam 604 is covered above the communication hole 4012, and the exhaust channel communicates with the first cavity via the communication hole 4012, so as to realize communication between the exhaust channel and the gas passing beam 604.

In an embodiment, as shown in fig. 1 and 5, the battery cell module 200 may include a plurality of battery cell assemblies 201 disposed side by side along the first direction X, each battery cell assembly 201 includes a plurality of battery cells stacked along the second direction Y, and a terminal post of the battery cell is disposed on an end face of the battery cell in the first direction X, so that the terminal post and the first explosion-proof valve 2011 are disposed on different surfaces of the battery cell, and further separation of electric heat is achieved.

Preferably, as shown in fig. 1, the battery pack may further include a longitudinal beam 900 extending along the second direction Y, where the longitudinal beam 900 divides the accommodating space into a plurality of accommodating portions, and each accommodating portion is provided with one of the battery cell assemblies 201, so that on one hand, the strength of the housing 100 of the battery pack is effectively improved; on the other hand, each cell assembly 201 is effectively separated, and mutual interference of the cell assemblies 201 is effectively reduced.

In an embodiment, as shown in fig. 1 and fig. 5, the battery cell may further include a second explosion-proof valve 2012, where the second explosion-proof valve 2012 is disposed on an end face of the battery cell in the first direction X, so that a pressure release outlet of the battery is effectively increased, safety of the battery cell is further ensured, and a probability of deformation caused by untimely pressure release of the battery cell is effectively reduced.

Preferably, as shown in fig. 1, the longitudinal beam 900 may include a third cavity and a first air passing hole 901, the third cavity extends along the second direction Y, the first air passing hole 901 is disposed on two sides of the longitudinal beam 900 opposite to each other in the first direction X, and the second explosion-proof valve 2012 of the battery cell facing the longitudinal beam 900 is disposed corresponding to the first air passing hole 901, so that the pressure release gas disposed on the second explosion-proof valve 2012 facing the longitudinal beam 900 is directly discharged from the third cavity, thereby reducing the probability that the pressure release gas discharged through the second explosion-proof valve 2012 impacts the electrical connection structure of the battery cell module 200.

Preferably, as shown in fig. 1, the side beam 605 may further include a second gas passing hole 6051, the second gas passing hole 6051 is disposed at the inner side of the side beam 605, and the second explosion-proof valve 2012 of the battery cell facing the side beam 605 is disposed corresponding to the second gas passing hole 6051, so that the pressure release gas of the second explosion-proof valve 2012 disposed at the side beam 605 is directly discharged from the second cavity, thereby reducing the probability that the pressure release gas discharged through the second explosion-proof valve 2012 impacts the electrical connection structure of the battery cell module 200.

Preferably, as shown in fig. 1, the battery pack may further include a front beam 700 and a rear beam 800, both extending along the first direction X, and the battery cell module 200 is disposed between the front beam 700 and the rear beam 800, so that the deformation resistance of the battery pack and the setting stability of the battery cell module 200 are effectively improved.

Preferably, as shown in fig. 1, the rear cross member 800 may further include a fourth cavity and an exhaust hole 801 extending along the first direction X, where the second cavity and the third cavity are sequentially communicated with the exhaust portion 601 through the fourth cavity and the exhaust hole 801, and thus, the pressure release gas is converged to the exhaust hole 801 through the fourth cavity and then flows to the exhaust portion 601 through the exhaust hole 801, so as to control the exhaust direction of the pressure release gas.

Optionally, as shown in fig. 1, the battery pack may further include a cold plate 1000, where the cold plate 1000 is covered above the battery core module 200, and the cold plate 1000 is welded with the front beam 700 and the rear beam 800 respectively, so that on one hand, the cold plate 1000, the bottom guard plate 300, the front beam 700, the rear beam 800 and the two side beams 605 form a closed space, thereby ensuring the environmental stability of the accommodating space and further ensuring the operational stability of the battery core module 200; on the other hand, the cool air, which facilitates the cooling of the cold plate 1000, flows to the entire battery pack, improving the cooling efficiency of the cold plate 1000.

Alternatively, the vent may be an explosion-proof valve provided on the housing 100.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims (10)

1. The battery pack is characterized by comprising a shell, a battery cell module, a bottom guard plate and a reinforcing rib plate, wherein an accommodating space for accommodating the battery cell module is formed by surrounding the shell and the bottom guard plate;

the reinforcing rib plate comprises at least one reinforcing convex rib, the reinforcing rib is attached to the bottom guard plate, and the reinforcing convex rib protrudes towards one side opposite to the bottom guard plate, so that an exhaust channel is formed between the reinforcing convex rib and the bottom guard plate in a surrounding mode;

the bottom of the battery cell module is provided with at least one row of first explosion-proof valves, the battery cell module is arranged on the reinforcing rib plate, and each reinforcing rib is correspondingly arranged with one row of first explosion-proof valves;

the housing includes an exhaust portion, and the first explosion-proof valve communicates with the exhaust portion via the exhaust passage.

2. The battery pack of claim 1, wherein the battery pack comprises a plurality of battery cells,

the reinforcing rib plate comprises a plurality of reinforcing convex ribs which are arranged at intervals along the first direction,

each reinforcing rib extends along a second direction, and the second direction is perpendicular to the first direction;

the reinforcing ribs are provided with ventilation parts, and the first explosion-proof valve is communicated with the exhaust channel through the ventilation parts;

each reinforcing rib is provided with two supporting bars extending along the second direction, the ventilation part is arranged between the two supporting bars, and the cell module is arranged on the reinforcing ribs through the supporting bars.

3. The battery pack according to claim 1, wherein the reinforcing rib further comprises a plate body portion via which the plurality of reinforcing ribs are connected, the reinforcing rib being attached to the bottom protection plate via the plate body portion;

the battery pack further comprises a sealant layer arranged between the plate body part and the bottom guard plate.

4. The battery pack according to claim 2, wherein the case further includes a front side rail, a rear side rail, an air passing cross rail, and two side rails, each of which extends in the first direction, the side rails extends in a second direction, first ends of the two side rails are connected to both ends of the front side rail, respectively, second ends of the two side rails are connected to both ends of the rear side rail, respectively, and the second direction is perpendicular to the first direction;

the gas passing cross beam comprises a first containing cavity extending along the first direction, the side beam comprises a second containing cavity extending along the second direction, the exhaust part is arranged on the rear side beam, and the exhaust channel is communicated with the exhaust part sequentially through the first containing cavity and the second containing cavity.

5. The battery pack according to claim 4, wherein the reinforcing bead further includes a communication hole communicating with the exhaust passage, the gas passing cross member is covered over the communication hole, and the exhaust passage communicates with the first container via the communication hole.

6. The battery pack of claim 2, wherein the battery pack comprises a plurality of battery cells,

the ventilation part comprises a plurality of ventilation holes which are arranged at intervals along the second direction, and the ventilation holes of each reinforcing rib are in one-to-one correspondence with the first explosion-proof valves in the corresponding row.

7. The battery pack of claim 4, wherein the cell module comprises a plurality of cell assemblies disposed side-by-side along a first direction, each cell assembly comprising a plurality of cells stacked along the second direction, a terminal post of the cell disposed on an end face of the cell in the first direction.

8. The battery pack of claim 7, further comprising a stringer extending in the second direction, the stringer dividing the receiving space into a plurality of receiving portions, each of the receiving portions being provided with one of the cell assemblies.

9. The battery pack of claim 8, wherein the battery pack comprises a plurality of battery cells,

the battery cell also comprises a second explosion-proof valve, and the second explosion-proof valve is arranged on the end face of the battery cell in the first direction;

the longitudinal beam comprises a third containing cavity and a first air passing hole, the third containing cavity extends along the second direction, the first air passing hole is arranged on two sides of the longitudinal beam opposite to each other in the first direction, and a second explosion-proof valve of the battery cell facing the longitudinal beam is correspondingly arranged with the first air passing hole;

the side beam further comprises a second air passing hole, the second air passing hole is formed in the inner side of the side beam, and a second explosion-proof valve of the battery cell facing the side beam is arranged corresponding to the second air passing hole.

10. The battery pack of claim 9, further comprising a front beam and a rear beam each extending in the first direction, the cell module being disposed between the front beam and the rear beam;

the rear cross beam further comprises a fourth containing cavity and an exhaust hole, wherein the fourth containing cavity and the exhaust hole extend along the first direction, and the second containing cavity and the third containing cavity are communicated with the exhaust part sequentially through the fourth containing cavity and the exhaust hole.