CN220628071U - Battery pack - Google Patents

Abstract

The utility model discloses a battery pack, which comprises: the battery box body is internally provided with a battery module, and the bottom of the battery module is provided with an explosion-proof valve; the bottom guard plate assembly comprises a bottom guard plate and a module bottom plate, the bottom guard plate is connected to the bottom of the battery box body, the module bottom plate is supported between the battery module and the bottom guard plate, the module bottom plate is provided with an avoidance hole, the avoidance hole and the explosion-proof valve are opposite to each other, the bottom guard plate is provided with an exhaust channel, and the exhaust channel faces the avoidance hole and is opened. According to the battery pack provided by the embodiment of the utility model, the explosion-proof valve can be downwards arranged, and the gas generated inside can be timely and quickly discharged through the exhaust hole in the module bottom plate and the exhaust channel of the bottom guard plate, so that the occurrence probability of thermal runaway is reduced, and the bottom protection performance and the battery energy density of the battery pack are enhanced.

Description

Battery pack

Technical Field

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

Background

As a common transportation means for people to travel, various complex working conditions are often encountered in the running process, and along with the attention of people on safety performance, the safety performance of a battery pack is increasingly important. The current battery pack is basically arranged in such a way that the electrode column of the battery core is upward, the explosion-proof valve is upward, or the electrode column of the battery core faces one side or two sides, and the explosion-proof valve and the electrode column are on the same side, and the two battery core arrangement modes are relatively common, but are not perfect enough in the aspects of vibration, bottom protection performance and the like of the battery pack, and have room for improvement.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides a battery pack, which can realize the downward arrangement of the explosion-proof valve, improves the bottom protection performance of the battery pack through the arrangement of the bottom guard plate, and reduces the occurrence risk of thermal runaway through arranging the exhaust valve and the exhaust channel.

According to an embodiment of the present utility model, a battery pack includes: the battery box body is internally provided with a battery module, and the bottom of the battery module is provided with an explosion-proof valve; the bottom guard plate assembly comprises a bottom guard plate and a module bottom plate, the bottom guard plate is connected to the bottom of the battery box body, the module bottom plate is supported between the battery module and the bottom guard plate, the module bottom plate is provided with an avoidance hole, the avoidance hole and the explosion-proof valve are opposite to each other, the bottom guard plate is provided with an exhaust channel, and the exhaust channel faces the avoidance hole and is opened.

According to the battery pack disclosed by the embodiment of the utility model, the bottom guard plate assembly is arranged at the bottom of the battery box body, so that the impact force can be effectively absorbed by utilizing the cooperation of the module bottom plate and the bottom guard plate, the explosion-proof valve and the battery module are protected, and the overall structural strength of the bottom of the battery pack is improved. And locate the bottom of battery module with the explosion-proof valve, the exhaust passage that can utilize the end backplate is discharged, need not set up exhaust passage at the top or the lateral part of battery module like conventional battery package, realize inside compact design, do benefit to the energy density that improves the battery package, simultaneously, the exhaust hole in the module bottom plate and the exhaust passage of end backplate can in time and fast with the gas discharge of inside production, reduced the probability of occurrence of thermal runaway, further improved the holistic security of battery package.

According to the battery pack disclosed by the embodiment of the utility model, the side, facing the bottom guard plate, of the module bottom plate is provided with the open avoidance groove, the avoidance groove and the exhaust channel are in opposite distribution, and the avoidance hole is formed in the top wall of the avoidance groove.

According to the battery pack provided by the embodiment of the utility model, the plurality of avoidance holes are in one-to-one correspondence with the plurality of explosion-proof valves, and the plurality of avoidance holes are distributed at intervals along the length direction of the avoidance groove.

According to the battery pack disclosed by the embodiment of the utility model, the module bottom plate further comprises at least two supporting areas, the avoidance groove is defined between two adjacent supporting areas, and a first buffer supporting piece is arranged between the supporting areas and the battery module.

According to the battery pack disclosed by the embodiment of the utility model, the supporting area is internally provided with the plurality of buffer cavities, and two adjacent buffer cavities are separated by the separation rib plate.

According to the battery pack provided by the embodiment of the utility model, the side wall, connected with the avoidance groove, of the buffer cavity and/or at least one separation rib plate are/is configured as inclined reinforcing plates.

According to the battery pack provided by the embodiment of the utility model, the buffer cavity is internally provided with the cooling medium or the buffer material.

According to the battery pack provided by the embodiment of the utility model, the bottom guard plate is further provided with the buffer groove which is spaced from the exhaust channel, and the buffer groove is internally provided with the second buffer support piece.

According to the battery pack provided by the embodiment of the utility model, the buffer groove comprises the first buffer groove and the second buffer groove, the first buffer groove is opened at one side of the bottom guard plate, which is away from the module bottom plate, and the second buffer groove is opened at one side of the bottom guard plate, which is towards the module bottom plate.

The battery pack according to the embodiment of the utility model further comprises: the liquid cooling plate is arranged at the top of the battery box body, and heat conduction structural adhesive is arranged between the liquid cooling plate and the battery module.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

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

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

fig. 3 is a schematic structural view of a module base plate of a battery pack according to an embodiment of the present utility model;

FIG. 4 is a cross-sectional view taken along the direction A in FIG. 3;

fig. 5 is a schematic view of the structure of a bottom plate of a battery pack according to an embodiment of the present utility model.

Reference numerals:

the battery pack 100 is provided with a battery pack,

a battery box body 1, a battery module 11, an explosion-proof valve 12, a bottom guard board assembly 2,

a module bottom plate 21, an avoidance hole 211, an avoidance groove 212, a supporting area 213, a buffer cavity 2131, a separation rib 2132,

the bottom shield 22, the exhaust passage 221, the buffer tank 222, the first buffer tank 2221, the second buffer tank 2222,

the liquid cooling plate 3, the first buffer support piece 4, the second buffer support piece 5, the heat conduction structure glue 6.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

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.

The following describes a battery pack 100 according to an embodiment of the present utility model with reference to fig. 1 to 5, where a battery module 11 is disposed inside a battery case 1, an explosion-proof valve 12 is disposed at the bottom of the battery module 11, and a bottom protection plate assembly 2 is disposed at the bottom of the battery case 1, so that the whole is in an up-down structure, where the bottom protection plate assembly 2 is disposed to improve the bottom protection performance of the whole battery pack 100, and an exhaust channel 221 is disposed to exhaust gas generated inside in time, so as to reduce the possibility of occurrence of thermal runaway.

As shown in fig. 1, a battery pack 100 according to an embodiment of the present utility model includes a battery case 1 and a bottom guard plate assembly 2.

The battery box 1 is internally provided with a battery module 11, wherein, the bottom guard plate assembly 2 is arranged at the bottom of the battery box 1, the battery box 1 can be constructed into an annular frame structure with an open top and an open bottom, and the bottom guard plate assembly 2 is used for protecting and sealing the bottom of the battery box 1. The bottom of battery module 11 is equipped with explosion-proof valve 12, and explosion-proof valve 12 is used for battery module 11 to carry out the pressure release, and when actual design, can set up a plurality of explosion-proof valves 12 in the bottom of battery module 11 to make a plurality of explosion-proof valves 12 correspond the cooperation with a plurality of electric cores in the battery module 11 respectively, thereby when the thermal runaway, the condition of firing appear in arbitrary electric core wherein, can carry out the pressure release through corresponding explosion-proof valve 12 and exhaust, thereby avoid the inside atmospheric pressure of battery module 11 too big and arouse the problem of thermal runaway in a large scale, maintain battery package 100 internal stability, guarantee its sustainable normal use, increase of service life.

The bottom guard plate assembly 2 comprises a bottom guard plate 22 and a module bottom plate 21, the bottom guard plate 22 is connected to the bottom of the battery box body 1, the bottom guard plate 22 can be connected to the bottom of the battery box body 1 in a gluing or double-sided local back glue mode, the connection strength is increased, and the overall rigidity of the battery pack 100 is further improved. Wherein, the bottom guard plate 22 can adopt HC340/590DP high-strength steel or more, or adopts hot forming steel, etc., and adopts high-strength steel to improve the integral rigidity, and simultaneously greatly improve the protective performance of the bottom guard plate 22.

The module bottom plate 21 supports between the battery module 11 and the bottom guard plate 22, and therefore, the module bottom plate 21 is located below the battery module 11 and the explosion-proof valve 12, so that the module bottom plate 21 and the bottom guard plate 22 can jointly protect the battery module 11 and the explosion-proof valve 12, and further, the whole protection is formed at the bottom of the battery pack 100, the impact capacity can be effectively absorbed, and the bottom safety of the battery pack 100 is improved.

Further, the module bottom plate 21 is provided with an avoidance hole 211, the avoidance hole 211 is opposite to the explosion-proof valve 12, the bottom guard plate 22 is provided with an exhaust channel 221, and the exhaust channel 221 is opened towards the avoidance hole 211. That is, a vent hole may be provided directly under the explosion-proof valve 12 so that the gas at the explosion-proof valve 12 may enter the vent hole downward, the vent hole being opened toward the vent passage 221 of the bottom cover 22 so that the gas enters the vent passage 221 from the vent hole, and the gas is exhausted to the outside through the vent passage 221. Therefore, when the inside of the battery pack 100 is over-pressurized or overheated, the explosion-proof valve 12 is opened, the high-pressure or high-temperature gas inside can rapidly enter the exhaust hole, and then is discharged out of the battery pack 100 through the exhaust channel 221, so that the risk of heat diffusion is reduced, and the safety of the battery pack 100 is improved. And, locate the explosion-proof valve 12 in the bottom of battery module 11, do not need to set up the separate space that is used for the exhaust in the lateral part or the top of battery module 11, and can utilize the cavity that module bottom plate 21 inside formed to exhaust, can realize the compact design in the battery package 100, do benefit to the energy density that increases battery package 100.

Wherein, will dodge the hole 211 and locate module bottom plate 21, and locate the backplate 22 with exhaust passage 221, but make full use of module bottom plate 21 and backplate 22 on the structure space, improve space utilization, simultaneously, when being connected with backplate 22 and battery box 1, can make exhaust passage 221 be connected with the relief valve on the battery box 1, do benefit to the gas in the exhaust passage 221 and follow the relief valve and discharge in time, realize the quick discharge of gas. And in actual design, the structure such as insulating sheets can be stuck on the exhaust channel 221, so that the battery module 11 is effectively isolated, the battery module is prevented from being damaged, the normal operation of the battery module is ensured, and the service life of the battery module is prolonged.

According to the battery pack 100 provided by the embodiment of the utility model, the bottom guard plate assembly 2 is arranged at the bottom of the battery box body 1, so that the impact force can be effectively absorbed by utilizing the cooperation of the module bottom plate 21 and the bottom guard plate 22, the explosion-proof valve 12 and the battery module 11 are protected, and the overall structural strength of the bottom of the battery pack 100 is improved. And locate the explosion-proof valve 12 in the bottom of the battery module 11, can utilize the exhaust channel 221 of the bottom guard plate 22 to exhaust, do not need to set up the exhaust channel 221 on the top or lateral part of the battery module 11 like the conventional battery pack 100, realize the inside compact design, do benefit to the energy density that improves the battery pack 100, meanwhile, the exhaust hole in the module bottom plate 21 and the exhaust channel 221 of the bottom guard plate 22 can in time and fast exhaust the gas that produces inside, have reduced the occurrence probability of thermal runaway, further improve the overall security of the battery pack 100.

In some embodiments, the module bottom plate 21 is provided with an open avoidance groove 212 on a side facing the bottom guard plate 22, the avoidance groove 212 is opposite to the exhaust channel 221, and the avoidance hole 211 is disposed on a top wall of the avoidance groove 212. That is, the escape groove 212 is opposite to the exhaust passage 221 and is opened toward each other, i.e., both the escape groove 212 and the exhaust passage 221 may serve as an exhaust flow path for achieving an exhaust effect, thereby increasing the cross-sectional area of the exhaust flow path and increasing the amount of exhaust.

As shown in fig. 1 to 3, the avoidance groove 212 is provided on the lower side of the module bottom plate 21, and the avoidance groove 212 is opened downward, the exhaust passage 221 is provided on the upper side of the bottom guard plate 22, and the exhaust passage 221 is opened upward, and simultaneously, the avoidance hole 211 is provided on the top wall of the avoidance groove 212. Therefore, when the thermal runaway condition occurs in the battery module 11, the internal high-temperature gas can burst through the explosion-proof valve 12 and downwards enter the avoidance groove 212 from the avoidance hole 211, at this time, part of the gas can be discharged from the avoidance groove 212 towards the pressure release valve, and the other part of the gas can flow into the exhaust channel 221 and be discharged from the avoidance groove 212 towards the pressure release valve at the same time, so that the exhaust quantity is effectively increased, and the internal gas can enter the exhaust channel 221 from top to bottom and be discharged, namely, the effect of rapidly reducing the pressure or the temperature inside the battery pack 100 is achieved.

In some embodiments, the plurality of avoidance holes 211 are in one-to-one correspondence with the plurality of explosion-proof valves 12, and the plurality of avoidance holes 211 are spaced apart along the length direction of the avoidance groove 212. It can be appreciated that in the actual use process, the explosion-proof valves 12 may be set to be plural and in one-to-one correspondence with the battery cells, so that when any battery cell is out of control, the corresponding explosion-proof valve 12 can timely perform pressure relief and exhaust, thereby avoiding the large-scale out of control of the battery module 11. Correspondingly, the avoidance holes 211 corresponding to the explosion-proof valves 12 one by one are also arranged in a plurality, so that a setting space is reserved for the explosion-proof valves 12, the setting of the explosion-proof valves 12 is facilitated, meanwhile, the avoidance holes 211 are distributed at intervals along the length direction of the avoidance grooves 212, namely, each corresponding explosion-proof valve 12 is distributed at intervals, and the function stability of the explosion-proof valves 12 is better ensured.

Specifically, as shown in fig. 1-3, the module bottom plate 21 is located between the battery module 11 and the bottom protection plate 22, the explosion-proof valve 12 is located at the bottom of the battery module 11, the module bottom plate 21 is provided with an avoidance groove 212, the top wall of the avoidance groove 212 is provided with an avoidance hole 211, and the avoidance hole 211 and the explosion-proof valve 12 are opposite to each other and are in one-to-one correspondence to each other for avoiding the installation position of the explosion-proof valve 12.

In some embodiments, the module bottom plate 21 further includes at least two support regions 213, and the avoidance groove 212 is defined between two adjacent support regions 213, and the first buffer support 4 is disposed between the support region 213 and the battery module 11. That is, the support regions 213 are disposed on the module base 21, and the support regions 213 may be used to define the escape grooves 212, that is, each two adjacent support regions 213 may define one escape groove 212, so that the air flow at the escape holes 211 flows from between the two support regions 213 to the exhaust channel 221.

Meanwhile, a first buffer supporting piece 4 is arranged between the supporting area 213 and the battery module 11, and the first buffer supporting piece 4 is arranged to buffer the pressure from the outside, so that vibration possibly caused is reduced, the battery module 11 and the explosion-proof valve 12 are further protected, and the inside is supported, so that the structure is more stable and is not easy to deform.

As shown in fig. 1-3, the module base plate 21 is provided with five support areas 213, the five support areas 213 define four avoidance grooves 212, and a first buffer support 4 is disposed above the support areas 213, wherein the first buffer support 4 may be designed as a solid or honeycomb structure, such as MPP square microporous foam, MPP cellular foam, or the like.

In some embodiments, a plurality of cushioning cavities 2131 are formed within support area 213, with adjacent two cushioning cavities 2131 being separated by a divider web 2132. As shown in fig. 1-3, a plurality of buffer cavities 2131 are formed in the supporting area 213 of the module bottom plate 21, a separation rib plate 2132 is spaced between two adjacent buffer cavities 2131, the separation rib plate 2132 provides a certain supporting effect for the buffer cavities 2131, and meanwhile, the buffer cavities 2131 are designed as cavities, so as to provide conditions for playing different roles.

Specifically, the buffer cavity 2131 may directly adopt a cavity structure, or may be internally provided with a buffer energy absorbing material to buffer the pressure from the outside, and may alleviate the internal vibration, so as to protect the battery module 11 and the explosion-proof valve 12 to a certain extent, or the buffer cavity 2131 is directly designed into a liquid cooling cavity, such as an internal phase change material, so as to cool the lower part of the battery module 11, and the module bottom plate 21 may realize functions of supporting, cooling or buffering energy absorbing according to the actual situation, so that the functional user needing to be realized may flexibly select in the actual use, so that the battery pack 100 may be applicable to different situations, and the application range is increased.

In some embodiments, the side walls of the buffer chamber 2131 that connect with the relief slots 212 and/or the at least one divider web 2132 are configured as inclined stiffening webs. That is, one of the two sidewalls of each of the escape grooves 212 connected with the buffering chamber 2131 may be configured as an inclined reinforcing plate, or both may be configured as an inclined reinforcing plate, so that the impact force is not transferred upward along the reinforcing plate when the battery pack 100 is impacted at the bottom, thereby effectively dispersing the force and preventing the force from acting upward on the battery module 11, thereby not only enhancing the overall strength of the structure, but also dispersing the impact force at the bottom through the design of the inclined reinforcing plate, playing a role of buffering deformation, and further providing protection for the battery module 11 and the explosion-proof valve 12.

As shown in fig. 1-3, two side walls of the avoidance groove 212 connected with the buffer cavity 2131 are designed as inclined reinforcing plates, and the reinforcing plates are arranged to make the structure more stable, thereby improving the overall structural strength of the battery pack 100 and protecting the battery module 11 and the explosion-proof valve 12.

In some embodiments, a cooling medium or buffer material is disposed within the buffer cavity 2131. That is, the buffer cavity 2131 may be filled with a cooling medium to provide lower cooling to the battery module 11 so that the internal temperature is rapidly lowered; or, the buffer cavity 2131 may be filled with a buffer material to buffer and absorb the pressure from the outside, so as to achieve the purpose of vibration reduction, and at the same time, further provide protection for the battery module 11 and the explosion-proof valve 12.

Specifically, as shown in fig. 1-3, the module bottom plate 21 includes a supporting area 213, the supporting area 213 defines the avoidance groove 212, a buffer cavity 2131 is formed in the supporting area 213, the buffer cavities 2131 are separated by a separation rib plate 2132, the function of the buffer cavity 2131 depends on a filler selected by a user in an actual use process, if the battery module 11 needs to be cooled, a phase change material can be selectively arranged in the buffer cavity 2131, the buffer cavity 2131 is designed into a liquid cooling plate 3, if the battery module needs to be cooled, a buffering energy absorbing material can be selectively arranged in the buffer cavity 2131, the selected materials are different, the function of the buffer cavity 2131 is correspondingly different, and the application range of the battery pack 100 can be enlarged due to flexible selection of the content.

In some embodiments, the bottom shield 22 is further provided with a buffer slot spaced from the exhaust channel 221, in which buffer slot a second buffer support 5 is provided. As shown in fig. 1, a bottom cover 22 is provided at the bottom of the battery case 1, the bottom cover 22 is provided with a buffer groove spaced apart from the exhaust passage 221 except for the exhaust passage 221, the exhaust passage 221 is used to exhaust the gas inside the battery pack 100, and the buffer groove may be internally provided with a second buffer support 5.

Specifically, the second buffer support 5 is disposed in the buffer slot, so that when the bottom guard 22 is impacted by external force, the force can firstly act on the second buffer support 5, the second buffer support 5 can buffer through elastic deformation of itself, the impact force is prevented from acting on the module bottom plate 21 to cause deformation, and then protection is provided for the battery module 11 and the explosion-proof valve 12. The second cushioning support 5 may be made of the same material as the first cushioning support 4, or other cushioning materials may be used.

In some embodiments, as shown in fig. 1-2 and 4, the buffer slots include a first buffer slot 2221 and a second buffer slot 2222, the first buffer slot 2221 being open on a side of the bottom guard 22 facing away from the module bottom plate 21, the second buffer slot 2222 being open on a side of the bottom guard 22 facing toward the module bottom plate 21. That is, the buffer grooves on the bottom guard plate 22 include two types of buffer grooves, namely a first buffer groove 2221 and a second buffer groove 2222, wherein the first buffer groove 2221 and the second buffer groove 2222 are opened in one direction and opposite in opening direction, specifically, the first buffer groove 2221 is opened to a side facing away from the module bottom plate 21, and the second buffer groove 2222 is opened to a side facing the module bottom plate 21.

Specifically, as shown in fig. 1, a bottom protection plate 22 is connected to the bottom of the battery case 1, an exhaust channel 221 and a buffer groove are provided on the bottom protection plate 22, and a first buffer groove 2221 and a second buffer groove 2222 of the buffer groove are opened in different directions, and are each internally provided with a second buffer support 5.

It should be noted that, the vent channel 221 corresponding to the explosion-proof valve 12 is formed by a groove in the bottom guard 22, and if the Z-direction vent space is increased during thermal runaway, an elastic member may be added to the bottom of the vent channel 221, so that the vent space may be increased, and the abnormal noise of the battery pack 100 may be prevented from occurring in its entirety.

In some embodiments, further comprising: the liquid cooling plate 3, the top in battery box 1 is installed to liquid cooling plate 3, and is equipped with heat conduction structure between and the battery module 11 and glues 6. It should be noted that, the battery case 1 may be designed as an annular frame structure that is opened up and down, the bottom guard 22 is used for improving the bottom protection performance, and the liquid cooling plate 3 is disposed at the top to support the whole body, and simultaneously cool the battery module 11.

It is understood that the effect of the liquid cooling plate 3 is to cool the battery module 11, that is, when the temperature is too high due to the reaction inside the battery pack 100, the liquid cooling plate 3 can reduce the internal temperature, specifically, the liquid cooling plate 3 is mounted at the top of the battery box 1, that is, the internal temperature is reduced from the top, and meanwhile, the buffer cavity 2131 can be directly designed into a liquid cooling cavity, and meanwhile, the buffer cavity is cooled from the upper direction and the lower direction of the battery module 11. And be equipped with heat conduction structure between liquid cooling board 3 and the battery module 11 and glue 6, heat conduction structure glues 6 and has fine heat conduction, can make inside temperature conduct fast, and then accelerate cooling speed, improves cooling efficiency.

The liquid cooling plate 3 is arranged at the top of the battery box body 1, so that the battery module 11 can be cooled, and meanwhile, the whole battery pack 100 is supported; the heat conduction structure between the liquid cooling plate 3 and the battery box body 1 is glue 6, so that the rapid conduction of temperature can be realized, and meanwhile, the effect of connecting the liquid cooling plate 3 with the battery box body 1 is achieved, so that the structure is more stable and is not easy to damage.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A battery pack, comprising:

the battery box body is internally provided with a battery module, and the bottom of the battery module is provided with an explosion-proof valve;

the bottom guard plate assembly comprises a bottom guard plate and a module bottom plate, the bottom guard plate is connected to the bottom of the battery box body, the module bottom plate is supported between the battery module and the bottom guard plate, the module bottom plate is provided with an avoidance hole, the avoidance hole and the explosion-proof valve are opposite to each other, the bottom guard plate is provided with an exhaust channel, and the exhaust channel faces the avoidance hole and is opened.

2. The battery pack according to claim 1, wherein the module bottom plate is provided with an open avoidance groove on one side facing the bottom guard plate, the avoidance groove is distributed opposite to the exhaust passage, and the avoidance hole is formed in the top wall of the avoidance groove.

3. The battery pack according to claim 2, wherein the plurality of avoidance holes are in one-to-one correspondence with the plurality of explosion-proof valves, and the plurality of avoidance holes are distributed at intervals along the length direction of the avoidance groove.

4. The battery pack of claim 2, wherein the module base plate further comprises at least two support regions, wherein the avoidance groove is defined between two adjacent support regions, and a first buffer support is provided between the support regions and the battery module.

5. The battery pack of claim 4, wherein a plurality of buffer chambers are formed in the support region, adjacent two of the buffer chambers being spaced apart by a separator web.

6. The battery pack of claim 5, wherein the side walls of the buffer chamber connected to the relief groove and/or at least one of the separator ribs is configured as an inclined reinforcing plate.

7. The battery pack of claim 5, wherein a cooling medium or a buffer material is disposed in the buffer chamber.

8. The battery pack of claim 1, wherein the bottom guard plate is further provided with a buffer slot spaced from the vent channel, the buffer slot having a second buffer support disposed therein.

9. The battery pack of claim 8, wherein the buffer slot comprises a first buffer slot and a second buffer slot, the first buffer slot being open on a side of the bottom guard plate facing away from the module base plate, the second buffer slot being open on a side of the bottom guard plate facing toward the module base plate.

10. The battery pack of claim 1, further comprising: the liquid cooling plate is arranged at the top of the battery box body, and heat conduction structural adhesive is arranged between the liquid cooling plate and the battery module.