CN219717169U - Battery pack - Google Patents

Abstract

The utility model discloses a battery pack, comprising: the casing, battery monomer, the casing includes the last casing and the lower casing that link to each other, the lower casing includes bottom plate and boundary beam, the boundary beam is located the periphery of bottom plate along just along the circumference extension of bottom plate, be formed with exhaust passage in the boundary beam, the inside wall of boundary beam is formed with the receiving hole with exhaust passage intercommunication, be formed with the exhaust hole of intercommunication exhaust passage and external environment on the lateral wall of boundary beam, battery monomer is a plurality of and locates in the casing, battery monomer has explosion-proof valve, explosion-proof valve is relative with the receiving hole, battery monomer is suitable for discharging to exhaust passage through the receiving hole in, the discharge in the exhaust passage is suitable for discharging through the exhaust hole. According to the battery pack provided by the embodiment of the utility model, the explosion-proof valve is arranged opposite to the receiving hole, so that the discharge discharged by the battery unit through the explosion-proof valve can be discharged into the exhaust channel through the receiving hole and discharged through the exhaust hole, and the safety of the battery pack can be improved.

Description

Battery pack

Technical Field

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

Background

In the related art, when the battery monomer is out of control, the discharged matter discharged by the explosion-proof valve of the battery monomer can be accumulated in the battery pack, so that potential safety hazards can be caused to other battery monomers, and the battery shell can be damaged. Accordingly, improvements are needed.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present utility model is to provide a battery pack, in which an exhaust passage is formed in a side rail, a receiving hole is formed in an inner side wall of the side rail, which is in communication with the exhaust passage, and an explosion-proof valve of a battery cell is disposed opposite to the receiving hole, so that an exhaust discharged from the battery cell through the explosion-proof valve can be discharged into the exhaust passage through the receiving hole and discharged through an exhaust hole, thereby avoiding accumulation of the exhaust in the battery pack, avoiding potential safety hazards to other battery cells, avoiding damage to a battery case, and improving safety of the battery pack.

According to an embodiment of the present utility model, a battery pack includes: the shell comprises an upper shell and a lower shell which are connected, wherein the lower shell comprises a bottom plate and a side beam, the side beam is arranged on the periphery of the bottom plate and extends along the circumferential direction of the bottom plate, an exhaust channel is formed in the side beam, a receiving hole communicated with the exhaust channel is formed in the inner side wall of the side beam, and an exhaust hole communicated with the exhaust channel and the external environment is formed in the outer side wall of the side beam; the battery unit is a plurality of battery units and is arranged in the shell, the battery unit is provided with an explosion-proof valve, the explosion-proof valve is opposite to the receiving hole, the emission discharged by the battery unit through the explosion-proof valve is suitable for being discharged into the exhaust channel through the receiving hole, and the emission in the exhaust channel is suitable for being discharged through the exhaust hole.

According to the battery pack disclosed by the embodiment of the utility model, the exhaust channel is formed in the boundary beam, the receiving hole communicated with the exhaust channel is formed in the inner side wall of the boundary beam, the explosion-proof valve of the battery unit is arranged opposite to the receiving hole, so that the discharged matter discharged by the battery unit through the explosion-proof valve can be discharged into the exhaust channel through the receiving hole and discharged through the exhaust hole, the discharged matter can be prevented from being accumulated in the battery pack, potential safety hazards to other battery units can be avoided, and the battery shell can be prevented from being damaged, so that the safety of the battery pack can be improved, and the receiving hole and the exhaust hole are formed in the boundary beam, the weight of the boundary beam can be reduced, and the battery pack is light.

According to some embodiments of the utility model, a seal is provided between the explosion proof valve and the inner side wall of the side rail; the sealing piece is annular and extends along the circumferential direction of the receiving hole, the inner Zhou Cexian is provided with through holes which are opposite to and communicated with the receiving hole, or the sealing piece is provided with through holes which are in one-to-one correspondence with the receiving holes and is an integrated part.

According to some alternative embodiments of the present utility model, the projection of the through hole on the reference surface is a first projection, the projection of the explosion-proof valve on the reference surface is a second projection, the projection of the receiving hole on the reference surface is a third projection, the first projection is located in the second projection, the first projection is located in the third projection, and the reference surface is perpendicular to the central axis of the through hole.

According to some alternative embodiments of the utility model, the spacing between the outer contour of the first projection and the outer contour of the second projection ranges from 1 to 3mm; the distance between the outer contour line of the first projection and the outer contour line of the third projection ranges from 1 mm to 3mm.

According to some alternative embodiments of the utility model, the seal is a flame retardant.

According to some embodiments of the utility model, the vent hole is provided with a vent valve.

According to some embodiments of the utility model, a plurality of the battery cells are arranged along a first direction, each of the battery cells extends along a second direction, opposite ends of the battery cells along the second direction are provided with the explosion-proof valve, the first direction and the second direction are parallel to a horizontal direction, and the first direction is perpendicular to the second direction;

the boundary beam includes two first boundary beams that set up relatively along the second direction, exhaust passage includes first exhaust passage, two first boundary beam all is formed with first exhaust passage, two first boundary beam's inside wall all is formed with the receiving aperture, the receiving aperture with first exhaust passage intercommunication, battery monomer two explosion-proof valve respectively with two on the first boundary beam the receiving aperture sets up relatively.

According to some optional embodiments of the present utility model, a partition is disposed in the first exhaust passage to divide the first exhaust passage into a first sub exhaust passage and a second sub exhaust passage, the receiving holes are formed on an inner sidewall of the first sub exhaust passage and are communicated with the first sub exhaust passage, communication holes for communicating the first sub exhaust passage with the second sub exhaust passage are formed on the partition, the number of the communication holes and the receiving holes are the same and correspond to each other one by one, and each communication hole is disposed opposite to the corresponding receiving hole; the explosion-proof valve is provided with a first fire filtering net, and a second fire filtering net is arranged at the communicating hole.

According to some alternative embodiments of the present utility model, the side sill includes a second side sill connected to one side of the two first side sills along the first direction, the exhaust passage includes a second exhaust passage formed therein, the second sub exhaust passage communicates with the second exhaust passage, and the outer sidewall of the second side sill is formed with the exhaust hole communicating with the second exhaust passage.

According to some embodiments of the utility model, the plurality of battery cells are divided into at least one battery pack, each battery pack includes a plurality of battery cells arranged along a first direction, each battery cell extends along a second direction, the first direction and the second direction are parallel to a horizontal direction, the first direction is perpendicular to the second direction, positive terminals and negative terminals of the battery cells are respectively located on opposite sides of the battery cells along the first direction, and the positive terminal of one of two adjacent battery cells in each battery pack is opposite to and connected with the negative terminal of the other battery cell.

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 perspective view of a battery pack according to some embodiments of the present utility model;

fig. 2 is a sectional view of a part of the structure of the battery pack of fig. 1;

FIG. 3 is a schematic illustration of the mating of the battery pack and seal of FIG. 1;

fig. 4 is a perspective view of the lower housing of fig. 1;

FIG. 5 is a schematic illustration of the mating of the battery cell of FIG. 1 with a seal;

FIG. 6 is an enlarged view at A in FIG. 3;

fig. 7 is an enlarged view at B in fig. 4;

fig. 8 is an enlarged view at C in fig. 5.

Reference numerals:

100. a battery pack;

1. a lower housing; 10. a bottom plate;

20. edge beams;

21. a first side rail; 22. a first exhaust passage; 23. a first sub-exhaust passage; 24. a receiving hole; 25. a second sub-exhaust passage; 26. a partition plate; 27. a communication hole; 28. a second fire filter screen;

29. a second side rail; 30. a second exhaust passage; 31. an exhaust hole; 32. an exhaust valve;

33. a cross beam;

40. a battery pack; 41. a battery cell; 42. an explosion-proof valve; 43. a first fire screen; 44. a positive electrode terminal; 45. a negative electrode terminal;

50. a seal; 51. and a through hole.

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.

A battery pack 100 according to an embodiment of the present utility model is described below with reference to fig. 1 to 8.

As shown in fig. 1 to 8, a battery pack 100 according to an embodiment of the present utility model includes: a housing and a battery cell 41. The casing includes upper casing and lower casing 1 that link to each other, and lower casing 1 includes bottom plate 10 and boundary beam 20, and boundary beam 20 locates the periphery of bottom plate 10 along just extending along the circumference of bottom plate 10, is formed with the exhaust passage in boundary beam 20, and the inside wall of boundary beam 20 is formed with the receiving hole 24 with the exhaust passage intercommunication, is formed with the exhaust hole 31 of intercommunication exhaust passage and external environment on the lateral wall of boundary beam 20. The battery cells 41 are plural and provided in the housing, the battery cells 41 have explosion-proof valves 42, the explosion-proof valves 42 are opposite to the receiving holes 24, and the exhaust discharged from the battery cells 41 through the explosion-proof valves 42 is adapted to be discharged into the exhaust passage through the receiving holes 24, and the exhaust in the exhaust passage is adapted to be discharged through the exhaust holes 31.

The battery pack 100 is provided with a plurality of battery cells 41, the explosion-proof valve 42 of each battery cell 41 is opposite to the receiving hole 24, and the discharged materials can directly enter the exhaust channel from the receiving hole 24 and are discharged from the exhaust hole 31; when the plurality of battery cells 41 discharge the discharge from the explosion-proof valve 42, the discharge can enter the discharge channel from the corresponding receiving holes 24 and be discharged, so that the discharge can be discharged out of the battery pack 100 more quickly, and the discharge can be prevented from accumulating in the battery pack 100 and damaging other battery cells 41 and the battery housing. And the plurality of explosion-proof valves 42 correspond to the plurality of receiving holes 24, so that the plurality of receiving holes 24 are formed on the inner side wall of the side rail 20, and the exhaust holes 31 are formed on the outer side wall of the side rail 20, which can reduce the weight of the side rail 20, and is advantageous for realizing the weight reduction of the battery pack 100.

For example, when the battery cell 41 is thermally out of control, the exhaust including the gas flame flow which may enter the exhaust passage through the receiving hole 24 and then be discharged from the exhaust hole 31 is discharged from the outside of the battery, by providing the exhaust passage, the gas flame flow may be cooled while passing through the exhaust passage, the temperature at which the gas flame flow is discharged from the battery pack 100 may be reduced, and the gas flame flow directly enters the exhaust passage from the receiving hole 24, the gas flame flow may be prevented from damaging the other battery cells 41, the damage of the battery case by the gas flame flow may be prevented, the influence of the thermal out of control of the single battery cell 41 on the entire battery pack 100 may be reduced, and the gas flame flow may be more rapidly discharged from the exhaust passage when the plurality of battery cells 41 are thermally out of control, thereby the safety of the battery pack 100 may be improved.

Optionally, a liquid cooling plate is disposed on the bottom plate 10 of the battery pack 100, which is beneficial to reducing the temperature of the battery pack 100, and may improve the cooling efficiency of the battery pack 100.

According to the battery pack 100 of the embodiment of the utility model, the vent passage is formed in the side beam 20, the receiving hole 24 communicated with the vent passage is formed in the inner side wall of the side beam 20, the explosion-proof valve 42 of the battery cell 41 is arranged opposite to the receiving hole 24, so that the discharged matter discharged from the battery cell 41 through the explosion-proof valve 42 can be discharged into the vent passage through the receiving hole 24 and discharged through the vent hole 31, the discharged matter can be prevented from accumulating in the battery pack 100, potential safety hazards to other battery cells 41 can be avoided, damage to the battery case can be avoided, and therefore, the safety of the battery can be improved, and the weight of the side beam 20 can be reduced by forming the receiving hole 24 and the vent hole 31 on the side beam 20, which is beneficial to realizing the light weight of the battery pack 100.

According to some embodiments of the present utility model, referring to fig. 2, 3, 5, 6 and 8, a sealing member 50 is provided between the explosion-proof valve 42 and the inner sidewall of the side sill 20, the sealing member 50 is in a ring shape extending along the circumferential direction of the receiving hole 24 and the inner side Zhou Cexian defines a through hole 51 opposite to and communicating with the receiving hole 24, or the sealing member 50 is formed with through holes 51 in one-to-one correspondence with the receiving holes 24 and the sealing member 50 is an integral molding. For example, the sealing member 50 is disposed between the explosion-proof valve 42 and the inner side wall of the side beam 20, the plurality of receiving holes 24 are in one-to-one correspondence with the plurality of sealing members 50, the sealing member 50 has a ring shape extending along the circumferential direction of the receiving hole 24 and the inner side Zhou Cexian defines a through hole 51 opposite to and communicating with the receiving hole 24; for another example, the sealing member 50 is disposed between the explosion-proof valve 42 and the inner side wall of the side rail 20, the sealing member 50 is an integral piece, and a plurality of through holes 51 are formed in the sealing member 50, and the plurality of through holes 51 are in one-to-one correspondence with the plurality of receiving holes 24.

The sealing member 50 is disposed between the explosion-proof valve 42 and the inner side wall of the side sill 20, so that the exhaust discharged from the battery cell 41 through the explosion-proof valve 42 passes through the through hole 51 of the sealing member 50, then passes through the receiving hole 24 into the exhaust passage, and finally is discharged through the exhaust hole 31. This arrangement can ensure the tightness between the explosion-proof valve 42 and the inner side wall of the side sill 20, and can prevent the discharge from entering the gap between the explosion-proof valve 42 and the inner side wall of the side sill 20, thereby improving the safety of the battery.

According to some alternative embodiments of the present utility model, referring to fig. 1-8, the projection of the through hole 51 on the reference plane is a first projection, the projection of the explosion-proof valve 42 on the reference plane is a second projection, the projection of the receiving hole 24 on the reference plane is a third projection, the first projection is located in the second projection, the area of the through hole 51 is smaller than the area of the explosion-proof valve 42, the first projection is located in the third projection, the area of the through hole 51 is smaller than the area of the receiving hole 24, and the reference plane is perpendicular to the central axis of the through hole 51. The seal 50 is provided between the explosion-proof valve 42 and the inner side wall of the side sill 20, and by setting the area of the through hole 51 smaller than the area of the explosion-proof valve 42 and smaller than the area of the receiving hole 24, a better sealing effect can be achieved between the explosion-proof valve 42 and the inner side wall of the side sill 20.

According to some alternative embodiments of the utility model, referring to fig. 1-8, the spacing between the first projected outer contour and the second projected outer contour ranges from 1 to 3mm, and the spacing between the first projected outer contour and the third projected outer contour ranges from 1 to 3mm. In the case where the area of the through hole 51 is smaller than the area of the explosion-proof valve 42 and smaller than the area of the receiving hole 24, the size of the through hole 51 is set to define a range in which the sealing member 50 can play a better sealing role between the explosion-proof valve 42 and the inner side wall of the side sill 20 while ensuring smooth passage of the exhaust.

According to some alternative embodiments of the present utility model, referring to fig. 3 and 5, the seal 50 is a flame retardant. When the battery cell 41 is thermally out of control, the battery cell 41 discharges the flame flow through the explosion-proof valve 42, and the sealing member 50 is set to be a flame retardant member, so that the discharge of flame can be suppressed and the sealing member 50 can be ensured not to be burnt by flame easily, thereby ensuring the tightness between the explosion-proof valve 42 and the inner side wall of the boundary beam 20.

According to some embodiments of the present utility model, referring to fig. 1 and 4, an exhaust valve 32 is provided at the exhaust hole 31. The vent hole 31 communicates with the outside of the battery pack 100, and the vent valve 32 is provided at the vent hole 31, so that foreign substances and the like can be prevented from entering the inside of the battery pack 100, and the sealability of the battery pack 100 can be ensured. And when the exhaust enters the exhaust passage, the exhaust is stored in the exhaust passage without reaching the pressure value at which the exhaust valve 32 is opened; when the pressure value for opening the vent valve 32 is reached, the vent valve 32 is opened to discharge the discharged material to the outside of the battery pack 100, and the explosion-proof valve 42 is opened only when the pressure is excessive, so that the tightness of the battery pack 100 can be ensured and the safety of the battery pack 100 can be improved.

According to some embodiments of the present utility model, referring to fig. 1 to 5, a plurality of battery cells 41 are arranged in a first direction (referring to the e1 direction in the drawings), and each battery cell 41 extends in a second direction. The battery cell 41 has explosion-proof valves 42 at opposite ends in a second direction (refer to e2 direction in the drawing), and the first direction and the second direction are parallel to the horizontal direction, and the first direction is perpendicular to the second direction. By arranging two explosion-proof valves 42 on one battery cell 41, the speed of discharging the discharge amount of the battery cell 41 through the explosion-proof valves 42 can be improved, the situation that the battery cell 41 cannot discharge the discharge amount due to the abnormal opening of the single explosion-proof valve 42 can be avoided, the battery cell 41 can be ensured to discharge the discharge amount rapidly and smoothly, and the safety of the battery cell 41 can be improved.

The side sill 20 includes two first side sills 21 disposed opposite to each other in a second direction (refer to e2 direction in the drawing), the exhaust passage includes a first exhaust passage 22, the two first side sills 21 are each formed with a first exhaust passage 22, inner side walls of the two first side sills 21 are each formed with a receiving hole 24, the receiving holes 24 communicate with the first exhaust passage 22, and two explosion-proof valves 42 of the battery cell 41 are disposed opposite to the receiving holes 24 on the two first side sills 21, respectively. This arrangement makes it possible for two explosion-proof valves 42 of a battery cell 41 to discharge emissions from the receiving holes 24 on two first side rails 21, respectively, improves the speed at which the battery cell 41 discharges emissions through the first exhaust passage 22, and can avoid the situation in which the battery cell 41 cannot discharge emissions due to the abnormality of the opening of the one-sided explosion-proof valve 42 or the blockage of the one-sided first exhaust passage 22, so that the battery cell 41 can discharge emissions quickly and smoothly, thereby improving the safety of the battery pack 100.

By arranging the plurality of battery cells 41 in the first direction, each of the battery cells 41 is arranged to extend in the second direction, the first side beams 21 are arranged to be opposite in the second direction, and the plurality of battery cells 41 are arranged perpendicular to the first side beams 21, the structural strength of the lower case 1 can be improved.

And by providing the receiving holes 24 in both inner side walls of the two first side rails 21, the weight of the first side rails 21 can be further reduced, which is advantageous in achieving the weight reduction of the battery pack 100.

Optionally, the plurality of battery cells 41 are arranged along the first direction, each battery cell 41 extends along the second direction, and the battery cells 41 and the bottom plate 10 are bonded through the heat conduction structure glue.

According to some alternative embodiments of the present utility model, referring to fig. 2, a partition 26 is provided in the first exhaust passage 22 to divide the first exhaust passage 22 into a first sub exhaust passage 23 and a second sub exhaust passage 25, receiving holes 24 are formed in an inner sidewall of the first sub exhaust passage 23 and communicate with the first sub exhaust passage 23, communication holes 51 communicating the first sub exhaust passage 23 and the second sub exhaust passage 25 are formed in the partition 26, the number of the communication holes 51 and the receiving holes 24 are the same and correspond one to one, and each communication hole 51 is disposed opposite to the corresponding receiving hole 24. Wherein the explosion-proof valve 42 has a first fire screen 43, and a second fire screen 28 is provided at the communication hole 51. When the battery cell 41 is out of control, the battery cell 41 can discharge emission from the explosion-proof valve 42, the emission comprises gas flame flows, the gas flame flows can be filtered layer by layer through the two flame filtering nets by arranging the flame filtering nets at the explosion-proof valve 42 and the communication hole 51 respectively, flames can be fully filtered, and the gas can be effectively cooled in the gas flame flow discharge process by arranging the first exhaust channel 22 into a double-layer exhaust channel, so that the flames can be effectively prevented from being discharged out of the battery pack 100, and the safety of the battery pack 100 can be improved.

Optionally, a waterproof and breathable film is disposed at the fire screen, so that the fire screen can be sealed to prevent foreign matters outside the battery pack 100 from entering the battery pack 100 from the fire screen. When the battery cell 41 is out of control, the exhaust discharged from the explosion-proof valve 42 includes flame, the flame can burn the waterproof and breathable film, and the flame filter can start to filter the flame. This arrangement is simple in structure, convenient to manufacture, can improve the sealability of the battery, and can prevent flame from being discharged to the outside of the battery pack 100.

According to some alternative embodiments of the present utility model, referring to fig. 1, 2 and 4, the side sill 20 includes a second side sill 29, the second side sill 29 is connected to one side of the two first side sills 21 in the first direction (refer to the e1 direction in the drawing), the exhaust passage includes a second exhaust passage 30, a second exhaust passage 30 is formed in the second side sill 29, the second sub exhaust passage 25 communicates with the second exhaust passage 30, and an exhaust hole 31 communicating with the second exhaust passage 30 is formed in an outer side wall of the second side sill 29. By communicating the second sub-exhaust passage 25 with the second exhaust passage 30, the length of the exhaust passage is extended, so that the exhaust discharged from the explosion-proof valve 42 can be sufficiently cooled while passing through the exhaust passage, and finally can be discharged to the outside of the battery pack 100 from the exhaust hole 31 on the outer side wall of the second side rail 29, reducing the temperature at which the exhaust is discharged to the battery pack 100, thereby improving the safety of the battery pack 100.

According to some embodiments of the present utility model, referring to fig. 3, 6 and 8, a plurality of battery cells 41 are divided into at least one battery pack 40, for example, a plurality of battery cells 41 constitute one battery pack 40; for another example, the plurality of battery cells 41 may be divided into three battery packs 40. Each of the battery packs 40 includes a plurality of battery cells 41 arranged in a first direction (refer to the e1 direction in the drawing), each of the battery cells 41 extends in a second direction (refer to the e2 direction in the drawing), the first direction and the second direction are both parallel to the horizontal direction, the first direction is perpendicular to the second direction, the positive electrode terminal 44 and the negative electrode terminal 45 of the battery cell 41 are respectively located at opposite sides of the battery cell 41 in the first direction, and the positive electrode terminal 44 of one of the adjacent two battery cells 41 in each of the battery packs 40 is opposite to and connected with the negative electrode terminal 45 of the other. Through setting the positive terminal 44 and the negative terminal 45 of the battery unit 41 to be located at two opposite sides of the battery unit 41 along the first direction, and the battery unit 41 is arranged along the first direction, the positive terminal 44 of one adjacent two battery units 41 in the battery pack 40 can be directly connected with the negative terminal 45 of the other, the original installation procedure of connecting the two adjacent battery units 41 through the bus bar is omitted, the number of parts is reduced, the production cost is reduced, and the production efficiency is improved.

Alternatively, the positive electrode terminal 44 of one of the adjacent two battery cells 41 in each battery pack 40 is connected with the negative electrode terminal 45 of the other by conductive paste or conductive foam. This arrangement can make the electrical connection of the adjacent two battery cells 41 more stable and the connection more reliable.

Optionally, the lower case 1 further includes at least one beam 33 extending in the second direction, for example, when the plurality of battery cells 41 are divided into three battery packs 40, the lower case 1 includes two beams 33 arranged in the first direction, a single beam 33 extends in the second direction, and two adjacent battery packs 40 are separated by the beam 33, which is advantageous in partitioning the battery packs 40 in the battery pack 100 and can improve the structural strength of the battery packs 40.

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 shell comprises an upper shell and a lower shell which are connected, wherein the lower shell comprises a bottom plate and a side beam, the side beam is arranged on the periphery of the bottom plate and extends along the circumferential direction of the bottom plate, an exhaust channel is formed in the side beam, a receiving hole communicated with the exhaust channel is formed in the inner side wall of the side beam, and an exhaust hole communicated with the exhaust channel and the external environment is formed in the outer side wall of the side beam;

the battery unit is a plurality of battery units and is arranged in the shell, the battery unit is provided with an explosion-proof valve, the explosion-proof valve is opposite to the receiving hole, the emission discharged by the battery unit through the explosion-proof valve is suitable for being discharged into the exhaust channel through the receiving hole, and the emission in the exhaust channel is suitable for being discharged through the exhaust hole.

2. The battery pack of claim 1, wherein a seal is provided between the explosion-proof valve and an inside wall of the side rail;

the sealing piece is annular and extends along the circumferential direction of the receiving hole, the inner Zhou Cexian is provided with through holes which are opposite to and communicated with the receiving hole, or the sealing piece is provided with through holes which are in one-to-one correspondence with the receiving holes and is an integrated part.

3. The battery pack of claim 2, wherein the projection of the through hole on the reference surface is a first projection, the projection of the explosion-proof valve on the reference surface is a second projection, the projection of the receiving hole on the reference surface is a third projection, the first projection is located in the second projection, the first projection is located in the third projection, and the reference surface is perpendicular to a central axis of the through hole.

4. A battery pack according to claim 3, wherein the spacing between the outer contour of the first projection and the outer contour of the second projection is in the range of 1-3 mm; the distance between the outer contour line of the first projection and the outer contour line of the third projection ranges from 1 mm to 3mm.

5. The battery pack of claim 2, wherein the seal is a flame retardant.

6. The battery pack of claim 1, wherein the vent hole is provided with a vent valve.

7. The battery pack according to any one of claims 1 to 6, wherein a plurality of the battery cells are arranged in a first direction, each of the battery cells extends in a second direction, opposite ends of the battery cells in the second direction each have the explosion-proof valve, the first direction and the second direction are each parallel to a horizontal direction, and the first direction is perpendicular to the second direction;

the boundary beam includes two first boundary beams that set up relatively along the second direction, exhaust passage includes first exhaust passage, two first boundary beam all is formed with first exhaust passage, two first boundary beam)'s inside wall all is formed with the receiving aperture, the receiving aperture with first exhaust passage intercommunication, battery monomer two explosion-proof valve respectively with two on the first boundary beam the receiving aperture sets up relatively.

8. The battery pack according to claim 7, wherein a partition plate is provided in the first exhaust passage to partition the first exhaust passage into a first sub exhaust passage and a second sub exhaust passage, the receiving holes are formed in an inner side wall of the first sub exhaust passage and communicate with the first sub exhaust passage, communication holes communicating the first sub exhaust passage and the second sub exhaust passage are formed in the partition plate, the communication holes and the receiving holes are the same in number and correspond one to one, and each communication hole is provided opposite to the corresponding receiving hole;

the explosion-proof valve is provided with a first fire filtering net, and a second fire filtering net is arranged at the communicating hole.

9. The battery pack according to claim 8, wherein the side sill includes a second side sill connected to one side of the two first side sills in the first direction, the exhaust passage includes a second exhaust passage formed therein, the second sub exhaust passage communicates with the second exhaust passage, and the outer side wall of the second side sill is formed with the exhaust hole communicating with the second exhaust passage.

10. The battery pack according to any one of claims 1 to 6, wherein a plurality of the battery cells are divided into at least one battery pack, each of the battery packs includes a plurality of the battery cells arranged in a first direction, each of the battery cells extends in a second direction, the first direction and the second direction are both parallel to a horizontal direction, the first direction is perpendicular to the second direction, positive and negative electrode terminals of the battery cells are located on opposite sides of the battery cells in the first direction, respectively, the positive electrode terminal of one of the adjacent two of the battery cells in each of the battery packs is opposite to and connected with the negative electrode terminal of the other.