CN218101599U - Battery pack - Google Patents

Abstract

The application provides a battery pack, and relates to the technical field of batteries. The battery pack comprises a box body and a battery cell, wherein a containing cavity is formed in the box body, the battery cell is arranged in the containing cavity, a shell of the battery cell is provided with a pressure relief structure, the pressure relief structure comprises a pressure relief hole formed in the shell and a pressure relief boss which surrounds the pressure relief hole and is convexly arranged on the outer surface of the shell, and the pressure relief boss surrounds a pressure relief channel communicated with the pressure relief hole; an exhaust channel is embedded in the box body, an avoiding hole communicated with the exhaust channel is formed in the inner side of the box body, and a pressure relief boss of the battery cell is inserted into the avoiding hole. Through making the pressure release boss insert in dodging downtheholely for when electric core was released because of thermal runaway, the jet can directly enter into in the exhaust passage through pressure release hole, pressure release channel. The jet is difficult to dissipate around in the box from the pressure release hole blowout back to avoid the jet of high temperature to produce adverse effect to other electric cores, and then avoid thermal runaway's stretching.

Description

Battery pack

Technical Field

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

Background

In the prior art, a lithium battery cell comprises a shell, and a roll core and electrolyte in the shell. During the use of the battery cell, thermal runaway may be caused by some abnormal factors, and the internal pressure of the battery cell after the thermal runaway may sharply rise, possibly resulting in explosion. In the related art, a pressure relief structure is arranged on a shell of the battery cell, so that pressure can be released after the internal pressure of the battery cell reaches a threshold value, and the internal pressure of the battery cell is relieved. Pressure release structure can spout high temperature material in the pressure release process, because often contain a plurality of electric cores in the battery package, when an electric core thermal runaway, its blowout probably spreads everywhere after releasing from pressure release structure department, causes the outside short circuit of a plurality of electric cores to cause more serious thermal runaway to spread the incident.

SUMMERY OF THE UTILITY MODEL

An object of the application is to provide a battery pack, it can well accept the blowout when electric core pressure release, avoids thermal runaway to spread.

The embodiment of the application is realized as follows:

the embodiment of the application provides a battery pack, which comprises a box body and a plurality of battery cores, wherein the box body forms a containing cavity;

the battery cell comprises a shell, wherein the shell is provided with a pressure relief structure, the pressure relief structure comprises a pressure relief hole formed in the shell and a pressure relief boss which surrounds the pressure relief hole and is convexly arranged on the outer surface of the shell, and the pressure relief boss surrounds a pressure relief channel communicated with the pressure relief hole; be provided with exhaust passage in the box, the side is opened to be equipped with the hole of dodging that communicates exhaust passage in the box, and the pressure release boss of electricity core inserts dodges downtheholely.

In an optional embodiment, the battery cell further includes a terminal disposed on the housing, and the terminal and the pressure relief structure are respectively located on two opposite sides of the housing.

In an alternative embodiment, the pressure relief structure further comprises a pressure relief member disposed inside the pressure relief channel to block the pressure relief channel.

In an alternative embodiment, the box body is provided with an exhaust port, and the exhaust port is communicated with the exhaust channel.

In an optional embodiment, the box body comprises a bottom plate assembly and a frame body arranged on the bottom plate assembly, the bottom plate assembly and the frame body enclose a containing cavity of the box body, the bottom plate assembly bears the battery cell, a first exhaust channel is formed in the bottom plate assembly, a avoiding hole is formed in the bottom plate assembly and communicated with the first exhaust channel, and a pressure relief boss of the battery cell is inserted into the avoiding hole;

a second exhaust passage is arranged in the frame body and communicated with the first exhaust passage, and the exhaust port is arranged on the outer side of the frame body and communicated with the second exhaust passage.

In an optional embodiment, the frame body comprises two end plates and two side plates, the two end plates are oppositely arranged, a second exhaust channel is formed in each end plate, the two exhaust ports are respectively arranged on the outer sides of the two end plates, the bottom plate assembly comprises a plurality of first exhaust channels, the extending direction of each first exhaust channel is consistent with the spacing direction of the two end plates, and the two ends of each first exhaust channel are respectively communicated with the second exhaust channels in the two end plates.

In an optional embodiment, the battery cells are arranged on the bottom plate assembly in multiple rows, the multiple rows of battery cells correspond to the multiple first exhaust channels one to one, and the pressure relief boss of each row of battery cells is inserted into the corresponding first exhaust channel.

In an alternative embodiment, the bottom plate assembly includes a first bottom plate and a second bottom plate, a first exhaust channel is formed between the first bottom plate and the second bottom plate, and a first avoidance hole for inserting the pressure relief boss is formed in the first bottom plate.

In an optional implementation mode, the bottom plate assembly further comprises a water cooling plate, the water cooling plate is laid on the first bottom plate, a water cooling channel is formed inside the water cooling plate or between the water cooling plate and the first bottom plate, a second avoiding hole is formed in the water cooling plate and correspondingly communicated with the first avoiding hole, the second avoiding hole is communicated with the water cooling channel, the pressure relief boss of the battery core penetrates through the water cooling plate through the second avoiding hole and is inserted into the first exhaust channel through the first avoiding hole.

In an alternative embodiment, the vent is provided with a waterproof vent valve.

The beneficial effects of the embodiment of the application are that:

the application provides a battery pack holds box and electric core in chamber including forming, and electric core sets up in holding the intracavity. Be provided with pressure release structure on the casing of electricity core, pressure release structure is including seting up the pressure release hole of casing and around pressure release hole and protruding pressure release boss of locating the casing surface, the pressure release boss encloses into the pressure release passageway with pressure release hole intercommunication. An exhaust channel is buried in the box body, an avoiding hole communicated with the exhaust channel is formed in the inner side of the box body, and a pressure relief boss of the battery cell is inserted into the avoiding hole, so that one end, far away from the shell, of the pressure relief channel is communicated with the exhaust channel. In the embodiment of the application, through set up the pressure release boss on the casing at electric core to make the pressure release boss insert and dodge downthehole so that pressure release channel and exhaust passage communicate, make when electric core because of thermal runaway when the pressure release, the blowout thing can be through pressure release hole, pressure release channel directly enter into in the exhaust passage. Due to the blocking and guiding effects of the pressure relief boss, the ejected materials cannot be scattered around the box body after being ejected from the pressure relief hole, so that adverse effects of the ejected materials with high temperature on other electric cores are avoided, and further the spreading of thermal runaway is avoided.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

Fig. 1 is a schematic diagram of a cell in an embodiment of the present application;

fig. 2 is a schematic diagram of a cell at a first viewing angle according to an embodiment of the present disclosure;

fig. 3 is a schematic diagram of a cell at a second viewing angle according to an embodiment of the present disclosure;

fig. 4 is a cross-sectional view of a cell in an embodiment of the present application;

FIG. 5 is a schematic view of a housing according to an embodiment of the present application;

fig. 6 isbase:Sub>A cross-sectional view of the battery pack of fig. 1 in the directionbase:Sub>A-base:Sub>A;

FIG. 7 is an enlarged view of section VII of FIG. 6;

fig. 8 is a sectional view of the battery pack of fig. 1 in the direction B-B.

010-battery pack; 100-a box body; 110-a backplane assembly; 111-a first exhaust channel; 112-avoidance holes; 113-a first backplane; 114-a first avoidance hole; 115-a second base plate; 116-water cooling plate; 117-second avoidance hole; 118-rib plate; 120-a frame body; 121-end plate; 122-a second exhaust passage; 123-an exhaust port; 124-waterproof air-permeable valve; 125-side plate; 200-electric core; 210-a housing; 220-pole column; 230-a pressure relief structure; 231-pressure relief holes; 232-pressure relief boss; 233-pressure relief channel; 234-a bleeder; 235-protective film.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience of describing the present application and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in this application will be understood to be a specific case for those of ordinary skill in the art.

The shell of some existing battery cores is provided with a pressure relief structure to realize directional pressure relief, so that explosion caused by overhigh internal pressure of the battery cores is avoided. However, when the pressure inside the battery cell is released through the pressure relief structure, the ejecta are often ejected from the pressure relief structure, and the ejecta contain high-temperature molten substances and high-temperature gas, and if the ejecta are left to dissipate around in the battery pack, adverse effects (such as short circuit and thermal runaway) are brought to other battery cells without thermal runaway. In the related art, the discharge channel is arranged to accommodate the jet of the battery core, and the discharge channel is opposite to the pressure relief hole through the avoidance port, so that the jet jetted from the pressure relief hole can enter the discharge channel through the avoidance port. However, even so, because there is a gap between the inner wall of the box body and the outer wall of the cell casing, the pressure relief hole and the avoiding hole cannot be tightly and accurately butted, so that a part of ejections sprayed from the pressure relief hole easily enter the gap between the cell and the box body and are dissipated to other cells, thereby causing adverse effects on other cells.

In order to solve the problem that the ejecta cannot be better accommodated when the battery cell is in thermal runaway in the related art, embodiments of the present application provide a battery cell and a battery pack including the battery cell.

Fig. 1 is a schematic diagram of a battery cell 200 according to an embodiment of the present disclosure. Referring to fig. 1, the battery pack 010 of the present embodiment includes a case 100 and a plurality of battery cells 200 disposed in the case 100. The case 100 has an opening, the battery cell 200 is placed at the bottom of the case 100 through the opening of the case 100, and the side of the battery cell 200 on which the pole 220 is disposed faces the opening of the case 100. In this embodiment, the battery cells 200 are arranged in four rows in the box 100, each row of twelve battery cells 200, and each two rows of battery cells 200 form a battery module. Of course, in other optional embodiments, the number of battery modules included in the battery pack 010 and the number of the battery cells 200 in each battery module may be adjusted as needed. In this embodiment, electric core 200 is the cuboid electric core, and arranging of electric core 200 is compact to reduce battery package 010 whole volume.

Fig. 2 is a schematic diagram of a battery cell 200 in a first view according to an embodiment of the present disclosure; fig. 3 is a schematic diagram of a battery cell 200 in a second view angle according to an embodiment of the present application; fig. 4 is a cross-sectional view of a battery cell 200 according to an embodiment of the present disclosure. As shown in fig. 2 to 4, the battery cell 200 includes a casing 210 and a pole 220 disposed on the casing 210, wherein a winding core and an electrolyte are disposed in the casing 210. The housing 210 is provided with a pressure relief structure 230, and the pressure relief structure 230 and the pole 220 are located on different sides of the housing 210. The pressure relief structure 230 is used to directionally release the pressure inside the battery cell 200 when the pressure inside the casing 210 of the battery cell 200 reaches a threshold value, which is referred to as a pressure relief process. During the pressure relief process, part of the high-pressure substance inside the battery cell 200 may be released to the outside of the casing 210 through the pressure relief structure 230. This application embodiment sets up in the different sides of casing 210 through with pressure relief structure 230 and utmost point post 220, has avoided the direct short circuit or the arc phenomenon that leads to on falling on utmost point post 220 of jet. In the present embodiment, the pressure relief structure 230 and the pole column 220 are respectively located at two opposite sides of the casing 210, specifically, the pressure relief structure 230 is located at the bottom of the battery cell 200, and the pole column 220 is located at the top of the battery cell 200. In alternative embodiments, the pole 220 and the pressure relief structure 230 may be disposed on adjacent sides, and the substance sprayed from the pressure relief structure 230 is not easy to directly fall on the pole 220.

In this embodiment, the pressure releasing structure 230 includes a pressure releasing hole 231 disposed on the housing 210 and a pressure releasing boss 232 surrounding the pressure releasing hole 231 and protruding from the outer surface of the housing 210, and the pressure releasing boss 232 encloses a pressure releasing channel 233 communicating with the pressure releasing hole 231. The pressure release hole 231 communicates with the inside of the case 210 of the battery cell 200 and also communicates with the pressure release passage 233. The end of the pressure relief boss 232 remote from the housing 210 forms the outlet of the pressure relief channel 233. In this embodiment, the pressure relief structure 230 further includes a pressure relief member 234, and the pressure relief member 234 is disposed inside the pressure relief channel 233 to block the pressure relief channel 233. The function of the pressure relief member 234 is that, when the battery cell 200 is in a normal state without thermal runaway, the pressure relief member 234 partitions the inside and outside of the casing 210; when the pressure inside the casing 210 reaches a threshold value and exceeds the bearing capacity of the pressure relief member 234, the pressure relief member 234 is broken, so that the inside of the casing 210 communicates with the outside of the casing 210 through the pressure relief hole 231 and the pressure relief passage 233, thereby releasing the pressure. In alternative embodiments, the location of the pressure relief member 234 may be adjusted, such as at the end of the pressure relief channel 233 near the pressure relief hole 231 to close the pressure relief hole 231, or at the end of the pressure relief channel 233 far from the pressure relief hole 231.

In the present embodiment, the pressure relief boss 232 is disposed along an edge of the pressure relief hole 231 and extends downward perpendicular to the bottom of the case 210. In the present embodiment, the pressure relief hole 231 is a kidney-shaped hole; in alternative embodiments, the shape of the pressure relief hole 231 may be adjusted as needed, such as being circular, rectangular, or oval.

In this embodiment, the pressure relief structure 230 further comprises a protection film 235, and the protection film 235 covers one end of the pressure relief boss 232 far away from the housing 210, thereby blocking the outlet of the pressure relief channel 233. The protection film 235 may be made of plastic and is connected to the pressure relief protrusion 232 by means of adhesion, thereby sealing and protecting the pressure relief member 234.

In the present embodiment, the pressure relief boss 232 may be welded or integrally formed with the case 210 of the battery.

Fig. 5 is a schematic view of the box 100 according to an embodiment of the present disclosure. As shown in fig. 5, the box 100 includes a bottom plate assembly 110 and a frame 120 disposed on the bottom plate assembly 110, the bottom plate assembly 110 and the frame 120 enclose a containing cavity of the box 100, and the bottom plate assembly 110 is used for carrying the battery cells 200. In the present embodiment, the shape of the bottom plate assembly 110 is adapted to the shape of the array of battery cells 200, and is substantially rectangular; the frame body 120 is disposed along the edge of the bottom plate assembly 110, so as to be a rectangular frame, and the frame body 120 includes two end plates 121 disposed oppositely and two side plates 125 disposed oppositely.

In this embodiment, an exhaust channel is embedded in the box 100, an avoiding hole 112 communicating with the exhaust channel is formed in the inner side of the box 100, and the pressure relief boss 232 of the battery cell 200 is inserted into the avoiding hole 112, so that one end of the pressure relief channel 233 far away from the casing 210 is communicated with the exhaust channel. As can be seen from fig. 5, in the present embodiment, the avoidance hole 112 is disposed on the inner side of the bottom plate assembly 110, so that when the battery cell 200 is placed on the bottom plate assembly 110, the pressure relief boss 232 at the bottom of the battery cell 200 can be inserted into the avoidance hole 112, thereby communicating with the exhaust channel. It is understood that the avoiding holes 112 correspond to the battery cells 200 one to one, and the arrangement of the avoiding holes 112 on the bottom plate assembly 110 should be consistent with the arrangement of the battery cells 200, so in this embodiment, the avoiding holes 112 are arranged in four rows, and each row is twelve.

Further, the box body 100 is further provided with an exhaust port 123, and the exhaust port 123 is communicated with the exhaust channel, so that the gas released by the battery cell 200 can be delivered to the outside of the battery pack 010 through the exhaust channel and the exhaust port 123; the solid or liquid ejecta discharged from the battery cell 200 is accommodated in the exhaust passage. In the present embodiment, the gas outlet 123 is disposed at the outer side of the frame 120, so as to realize the lateral release of the gas ejected from the battery cell 200; in alternative embodiments, the air outlet 123 may also be disposed on the outer side of the bottom plate assembly 110 (i.e., the side facing away from the battery cells 200). Optionally, the air outlet 123 is provided with a waterproof vent valve 124, and when the internal pressure or temperature of the air outlet channel reaches a predetermined value, the waterproof vent valve 124 can be opened completely to release pressure quickly. The non-gaseous ejecta of the thermal runaway cell 200 may also be eventually discharged to the outside of the battery pack 010 by opening the waterproof vent valve 124.

Fig. 6 isbase:Sub>A cross-sectional view of the battery pack 010 inbase:Sub>A-base:Sub>A direction of fig. 1; FIG. 7 is an enlarged view of section VII of FIG. 6; fig. 8 is a sectional view of the battery pack 010 in the direction B-B of fig. 1. As shown in fig. 6 to 8, a first exhaust channel 111 is formed in the bottom plate assembly 110, an avoiding hole 112 communicating with the first exhaust channel 111 is formed in the bottom plate assembly 110, and the pressure relief boss 232 of the battery cell 200 is inserted into the avoiding hole 112, so that one end of the pressure relief channel 233 away from the casing 210 is communicated with the first exhaust channel 111. A second exhaust passage 122 is provided in the frame 120, the second exhaust passage 122 communicates with the first exhaust passage 111, and an exhaust port 123 is provided outside the frame 120 and communicates with the second exhaust passage 122.

Specifically, in the present embodiment, a second exhaust channel 122 is formed in the end plate 121, and two exhaust ports 123 are respectively disposed at the outer sides of the two end plates 121. The base plate assembly 110 includes a plurality of first exhaust passages 111 therein, the first exhaust passages 111 extend in the same direction as the interval direction between the two end plates 121, and both ends of the first exhaust passages 111 communicate with the second exhaust passages 122 of the two end plates 121, respectively. In this embodiment, four parallel and spaced first exhaust channels 111 are disposed in the bottom plate assembly 110, the multiple rows of battery cells 200 correspond to the multiple first exhaust channels 111 one by one, and the pressure relief boss 232 of each row of battery cells 200 is inserted into the corresponding first exhaust channel 111. In the present embodiment, the end of each first exhaust passage 111 converges to the second exhaust passage 122 of the end plate 121.

As shown in fig. 6 to 8, the base plate assembly 110 includes a first base plate 113 and a second base plate 115, a first exhaust channel 111 is formed between the first base plate 113 and the second base plate 115, and a first avoidance hole 114 for inserting the pressure relief boss 232 is formed on the first base plate 113. In this embodiment, the first bottom plate 113 is close to the inside of the cabinet 100, and the second bottom plate 115 is spaced apart from the first bottom plate 113, so that the first exhaust channel 111 may be formed between the first bottom plate 113 and the second bottom plate 115. Optionally, a plurality of pairs of rib plates 118 are further disposed between the first bottom plate 113 and the second bottom plate 115; specifically, four pairs of rib plates 118 are arranged between the first bottom plate 113 and the second bottom plate 115, and the number of the rib plates corresponds to the number of rows of the battery cells 200. The rib 118 is perpendicular to the first base plate 113 and the second base plate 115, and the extending direction of the rib 118 is consistent with the spacing direction of the two end plates 121. The pair of two rib plates 118 forms both side walls of the first exhaust passage 111. In addition to forming the sidewalls of the first exhaust passage 111, the rib plates 118 may also serve a supporting function, thereby enhancing the structural stability of the floor assembly 110. In this embodiment, the first avoiding hole 114 and the second avoiding hole 117 together form the avoiding hole 112 for the pressure relief boss 232 to insert into on the bottom plate assembly 110.

In this embodiment, the base plate assembly 110 further includes a water cooling plate 116, the water cooling plate 116 is disposed on the first base plate 113, and a water cooling channel (not shown) is formed inside the water cooling plate 116 or between the water cooling plate 116 and the first base plate 113. The battery cell 200 is disposed on the upper surface of the water cooling plate 116, and the water cooling plate 116 can cool the battery cell 200 through the circulating cooling liquid. The water-cooling plate 116 is provided with a second avoiding hole 117, the second avoiding hole 117 is correspondingly communicated with the first avoiding hole 114, the second avoiding hole 117 avoids the water-cooling channel, and the pressure relief boss 232 of the battery cell 200 passes through the water-cooling plate 116 through the second avoiding hole 117 and is inserted into the first exhaust channel 111 through the first avoiding hole 114. It should be understood that the second avoiding hole 117 on the water cooling plate 116 avoids the water cooling channel, which means that the second avoiding hole 117 does not pass through the water cooling channel or communicate with the water cooling channel, and the two are independent from each other, and the leakage of the cooling liquid due to the second avoiding hole 117 is not caused. Optionally, in the case that the water-cooling channel is embedded in the water-cooling plate 116, the second avoiding hole 117 should be formed in an area of the water-cooling plate 116 where the water-cooling channel is not formed; when the water-cooling plate 116 and the first bottom plate 113 together enclose the water-cooling channel, the second avoiding hole 117 should be formed in a region of the water-cooling plate 116 that does not participate in enclosing the water-cooling channel.

In the embodiment of the present application, the bottom of the casing 210 of the battery cell 200 is attached to the water cooling plate 116, and the water cooling plate 116 is attached to the first bottom plate 113. The height of the pressure relief boss 232 is greater than the sum of the lengths of the first avoidance hole 114 and the second avoidance hole 117, so that the pressure relief boss 232 can extend into the first exhaust passage 111, and all the ejecta can enter the first exhaust passage 111 without permeating from the gap between the first bottom plate 113 and the water cooling plate 116 or the gap between the water cooling plate 116 and the housing 210. It should be appreciated that to avoid poor venting of the pressure relief tab 232 abutting the second base plate 115, the height of the pressure relief tab 232 should not be too long and should be less than the distance between the upper surface of the water cooled plate 116 and the upper surface of the second base plate 115.

To sum up, be provided with pressure release structure 230 on the casing 210 of the battery cell 200 that this application provided, pressure release structure 230 is including seting up in the pressure release hole 231 of casing 210 and around pressure release hole 231 and protruding pressure release boss 232 of locating the casing 210 surface, pressure release boss 232 encloses into the pressure release passageway 233 with pressure release hole 231 intercommunication. The battery pack 010 provided by the application includes a case 100 forming an accommodating cavity and the battery cell 200, where the battery cell 200 is disposed in the accommodating cavity; an exhaust passage is embedded in the box body 100, an avoiding hole 112 communicated with the exhaust passage is formed in the inner side of the box body 100, and the pressure relief boss 232 of the battery cell 200 is inserted into the avoiding hole 112, so that one end, away from the casing 210, of the pressure relief passage 233 is communicated with the exhaust passage. In the embodiment of the present application, the pressure release protrusion 232 is disposed on the casing 210 of the battery cell 200, and the pressure release protrusion 232 is inserted into the avoidance hole 112 to communicate the pressure release channel 233 with the exhaust channel, so that when the battery cell 200 is depressurized due to thermal runaway, the jet can directly enter the exhaust channel through the pressure release hole 231 and the pressure release channel 233. Due to the blocking and guiding effects of the pressure relief boss 232, the ejecta cannot escape around the box body 100 after being ejected from the pressure relief hole 231, so that adverse effects of the high-temperature ejecta on other battery cells 200 are avoided, and further the thermal runaway is prevented from spreading.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. The battery pack is characterized by comprising a box body forming a containing cavity and a plurality of battery cells, wherein the battery cells are arranged in the containing cavity;

the battery cell comprises a shell, wherein a pressure relief structure is arranged on the shell, the pressure relief structure comprises a pressure relief hole formed in the shell and a pressure relief boss which surrounds the pressure relief hole and is convexly arranged on the outer surface of the shell, and a pressure relief channel communicated with the pressure relief hole is surrounded by the pressure relief boss; an exhaust passage is arranged in the box body, an avoiding hole communicated with the exhaust passage is formed in the inner side of the box body, and the pressure relief boss of the battery cell is inserted into the avoiding hole.

2. The battery pack of claim 1, wherein the battery cell further includes a terminal disposed on the housing, and the terminal and the pressure relief structure are respectively located on two opposite sides of the housing.

3. The battery pack according to claim 1, wherein the pressure relief structure further comprises a pressure relief member disposed inside the pressure relief channel to block the pressure relief channel.

4. The battery pack according to claim 1, wherein the case is provided with an exhaust port, the exhaust port communicating with the exhaust passage.

5. The battery pack according to claim 4, wherein the case includes a bottom plate assembly and a frame disposed on the bottom plate assembly, the bottom plate assembly and the frame enclose a containing cavity of the case, the battery cell is carried by the bottom plate assembly, a first exhaust channel is formed in the bottom plate assembly, the avoidance hole is formed in the bottom plate assembly and communicated with the first exhaust channel, and the pressure relief boss of the battery cell is inserted into the avoidance hole;

and a second exhaust passage is arranged in the frame body and communicated with the first exhaust passage, and the exhaust port is arranged on the outer side of the frame body and communicated with the second exhaust passage.

6. The battery pack according to claim 5, wherein the frame body includes two end plates and two side plates, the two end plates are disposed opposite to each other, the second exhaust channel is formed in the end plates, the two exhaust ports are disposed on outer sides of the two end plates, the bottom plate assembly includes a plurality of first exhaust channels, an extending direction of the first exhaust channels is consistent with a spacing direction of the two end plates, and two ends of the first exhaust channels are respectively communicated with the second exhaust channels of the two end plates.

7. The battery pack of claim 6, wherein the cells are arranged in multiple rows on the bottom plate assembly, the multiple rows of cells correspond to the first exhaust channels one-to-one, and the pressure relief bosses of each row of cells are inserted into the corresponding first exhaust channels.

8. The battery pack according to claim 5, wherein the bottom plate assembly comprises a first bottom plate and a second bottom plate, the first exhaust channel is formed between the first bottom plate and the second bottom plate, and a first avoidance hole for inserting the pressure relief boss is formed in the first bottom plate.

9. The battery pack of claim 8, wherein the bottom plate assembly further comprises a water cooling plate, the water cooling plate is laid on the first bottom plate, a water cooling channel is formed inside the water cooling plate or between the water cooling plate and the first bottom plate, a second avoidance hole is formed in the water cooling plate, the second avoidance hole is correspondingly communicated with the first avoidance hole, the water cooling channel is avoided by the second avoidance hole, and the pressure relief boss of the battery core penetrates through the water cooling plate through the second avoidance hole and is inserted into the first exhaust channel through the first avoidance hole.

10. The battery pack according to claim 4, wherein the vent is provided with a waterproof and breathable valve.

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