CN219917480U - Battery pack - Google Patents

Abstract

The utility model discloses a battery pack which comprises a lower box body, a first battery cell module and a second battery cell module. The first battery cell module and the second battery cell module are arranged, so that the battery pack capacity can be increased. The lower box body comprises a bottom plate, a first beam structure and a second beam structure, wherein the first beam structure and the second beam structure are arranged on the bottom plate. The first beam structure encloses into first accommodation area, and the second beam structure encloses into second accommodation area, and first beam structure and second beam structure interval set up. The first electric core module is arranged in the first accommodating area, and the second electric core module is arranged in the second accommodating area, so that the first electric core module and the second electric core module are arranged at intervals, the automobile space structure is met, and the problem of vehicle type space limitation is solved. Be equipped with first pressure release passageway in the first roof beam structure, be equipped with the second pressure release passageway in the second roof beam structure, first pressure release passageway and second pressure release passageway intercommunication have avoided battery package thermal runaway on the basis of reinforcing battery package structural strength, have improved the security performance of battery package.

Description

Battery pack

Technical Field

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

Background

Along with the popularization of electric vehicles, the requirements of users on the cruising of the electric vehicles are higher and higher, but the structural arrangement of the battery modules is limited by the space structure of the whole vehicle. In order to increase the electric quantity of the battery and improve the endurance mileage, a front-row battery module is generally arranged below a front-row seat of an automobile, and a rear-row battery module is arranged at the rear part of the automobile. When the battery module is assembled and used, heat dissipation is needed to be carried out, and safety accidents caused by battery firing are prevented. In the related art, the battery pack is protected from thermal runaway by providing an inner cavity pressure relief at the bottom. The high-temperature gas discharged from the battery core needs to be discharged out of the battery pack through the pressure release channel. The battery modules including the front and rear rows also have a pressure relief structure design that can vent high temperature gas, extend the pressure relief path, and effectively protect against thermal runaway.

Disclosure of Invention

The embodiment of the utility model provides a battery pack, which ensures that high-temperature gas discharged by a first battery cell module and a second battery cell module can be discharged by arranging a first pressure release channel and a second pressure release channel in a first beam structure and a second beam structure, avoids the condition of firing after the gas is discharged out of the battery pack, namely avoids thermal runaway of the battery pack, and improves the safety performance of the battery pack.

An embodiment of the present utility model provides a battery pack including:

the lower box body comprises a bottom plate, a first beam structure and a second beam structure, wherein the first beam structure and the second beam structure are arranged on the bottom plate, the first beam structure is enclosed into a first accommodating area, the second beam structure is enclosed into a second accommodating area, the first beam structure and the second beam structure are arranged at intervals, a first pressure release channel is arranged in the first beam structure, a second pressure release channel is arranged in the second beam structure, and the first pressure release channel is communicated with the second pressure release channel;

a first cell module disposed in the first containment region; and

and the second battery cell module is arranged in the second accommodating area.

In an embodiment, the first cell module includes a first sub-module and a second sub-module that are stacked, and the second cell module is a single-layer module.

In one embodiment, the lower case further comprises side plates and connecting beams;

one end of the side plate is abutted against the bottom plate, a pressure relief valve is arranged on the side plate, and the second beam structure is arranged on one side, far away from the side plate, of the first beam structure;

the one end of tie-beam is connected first roof beam structure, the other end of tie-beam is connected second roof beam structure, be equipped with the connecting channel in the tie-beam, the second pressure release passageway with the one end intercommunication of connecting channel, the other end of connecting channel with first pressure release passageway intercommunication, first pressure release passageway with the relief valve intercommunication.

In an embodiment, one surface of the first cell module, which is close to the bottom plate, is enclosed with the bottom plate and the first beam structure to form a first pressure release cavity, the first beam structure comprises a first cross beam, a first longitudinal beam, a second cross beam and a second longitudinal beam which are sequentially connected end to end, the first longitudinal beam is attached to the side plate and arranged along a first direction, the second longitudinal beam is arranged along the first direction, the first cross beam and the second cross beam are arranged along a second direction, and the first direction is perpendicular to the second direction and parallel to the bottom plate;

the first pressure relief channel comprises a first sub-channel arranged in the first cross beam, a second sub-channel arranged in the second longitudinal beam, a third sub-channel arranged in the second cross beam and a fourth sub-channel arranged in the first longitudinal beam, one end of the first sub-channel is communicated with one end of the second sub-channel, the other end of the second sub-channel is communicated with one end of the third sub-channel, the other end of the third sub-channel is communicated with one end of the fourth sub-channel, and the other end of the first sub-channel is disconnected from the fourth sub-channel;

one end of the first sub-channel is arranged at the end part of the first cross beam, which is close to the first longitudinal beam, a first pressure relief opening is formed in one face of the first cross beam, which faces the first pressure relief cavity, the first pressure relief opening is positioned at the end part of the first cross beam, which is close to the first longitudinal beam, the first pressure relief opening is communicated with the first pressure relief cavity and the first sub-channel, and the other end of the fourth sub-channel is arranged at the position, corresponding to the pressure relief valve, of the first longitudinal beam.

In an embodiment, one surface of the second cell module, which is close to the bottom plate, encloses with the bottom plate and the second beam structure to form a second pressure relief cavity, and the second beam structure faces the inner side surface of the second pressure relief cavity to form a plurality of second pressure relief openings, and the second pressure relief openings are communicated with the second pressure relief cavity and the second pressure relief channel.

In an embodiment, the first cell module further includes a support, the first sub-module is disposed in the first accommodating area, the support is disposed on the first sub-module, and the second sub-module is disposed on the support;

the support comprises a support main body and a support column, one end of the support column is abutted against the support main body, the other end of the support column is abutted against one face of the first sub-module, the support main body is enclosed into a third accommodating area, and the second sub-module is arranged in the third accommodating area.

In an embodiment, the first sub-module comprises a tray and a battery cell group arranged in the tray, the tray comprises a containing cavity and a lifting lug arranged on the outer side of the periphery of the containing cavity, the lifting lug is connected to the first beam structure, a positioning groove is formed in one surface, away from the first beam structure, of the lifting lug, and one end of the supporting column is abutted to the bottom of the positioning groove.

In an embodiment, the second sub-module is close to one side of the support main body and encloses with the support main body to form a third pressure release cavity, the support main body is provided with a pressure release hole communicated with the third pressure release cavity, a third pressure release channel communicated with the pressure release hole is arranged in the support column, the third pressure release channel is communicated with the first pressure release channel, and the first pressure release channel is communicated with the pressure release valve.

In an embodiment, the inner surfaces of the first pressure relief channel and the second pressure relief channel are provided with a flame retardant layer.

In an embodiment, the material of the first beam structure and the second beam structure is steel.

The utility model has the beneficial effects that:

the utility model provides a battery pack which comprises a lower box body, a first battery cell module and a second battery cell module. The first battery cell module and the second battery cell module are arranged, so that the battery pack capacity can be increased. The lower box body comprises a bottom plate, a first beam structure and a second beam structure, wherein the first beam structure and the second beam structure are arranged on the bottom plate. The first beam structure encloses into first accommodation area, and the second beam structure encloses into second accommodation area, and first beam structure and second beam structure interval set up. The first electric core module is arranged in the first accommodating area, and the second electric core module is arranged in the second accommodating area, so that the first electric core module and the second electric core module are arranged at intervals, the automobile space structure is met, and the problem of vehicle type space limitation is solved. Be equipped with first pressure release passageway in the first roof beam structure, be equipped with the second pressure release passageway in the second roof beam structure, first pressure release passageway and second pressure release passageway intercommunication have set up pressure release structure on the basis of reinforcing battery package structural strength, guarantee that the high temperature gas that first electric core module and second electric core module were let out can discharge, avoid taking place with the condition of taking place of gas discharge battery package back fire, avoid battery package thermal runaway promptly, improved the security performance of battery package.

Drawings

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

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

FIG. 2 is a schematic cross-sectional view of the A-A plane of FIG. 1;

fig. 3 is a schematic cross-sectional structure of a first beam structure, a second beam structure, and a connection beam of a battery pack according to an embodiment of the present utility model;

FIG. 4 is an enlarged schematic view of the partial area B in FIG. 2;

FIG. 5 is a schematic cross-sectional view of the C-C plane of FIG. 1;

fig. 6 is a schematic perspective view of a lower case and a bracket of a battery pack according to an embodiment of the present utility model;

fig. 7 is a schematic perspective view of a first sub-module, a second sub-module and a bracket of a battery pack according to an embodiment of the present utility model;

fig. 8 is a schematic perspective view of a battery pack according to an embodiment of the present utility model.

Reference numerals:

a battery pack 100;

a lower case 10; a first cell module 20; a second cell module 30; a bracket 40;

a bottom plate 11; a side plate 12; a first beam structure L1; a second beam structure L2; a connection beam L3; a first sub-module 21; a second sub-module 22; a holder main body 41; support columns 42;

a pressure relief valve G; a first cross beam H1; a first stringer Z1; a second cross beam H2; a second stringer Z2; a third cross beam H3; a third stringer Z3; a fourth cross beam H4; a fourth stringer Z4; a tray 211; a cell group 212;

a housing cavity 2111; lifting lugs 2112; a positioning groove J;

a first accommodation region P1; a second accommodation region P2; a third accommodation region P3;

a first pressure relief chamber Q1; a second pressure relief chamber Q2; a third pressure relief chamber Q3;

a first pressure relief port U1; a second pressure relief port U2; a pressure relief hole K;

a first pressure relief channel D1; a second pressure relief channel D2; a third pressure relief channel D3; a connection channel D4;

a first sub-channel D11; a second sub-channel D12; a third sub-channel D13; a fourth sub-channel D14; a fifth subchannel D21; a sixth sub-channel D22; a seventh sub-channel D23;

a first direction X; a second direction Y.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model. Furthermore, it should be understood that the detailed description is presented herein for purposes of illustration and description only, and is not intended to limit the utility model. In the present utility model, unless otherwise indicated, terms of orientation such as "upper" and "lower" are used to generally refer to the upper and lower positions of the device in actual use or operation, and specifically the orientation of the drawing figures; while "inner" and "outer" are for the outline of the device.

Referring to fig. 1 to 3, an embodiment of the present utility model provides a battery pack 100 including a lower case 10, a first cell module 20, and a second cell module 30. The lower case 10 includes a bottom plate 11, a first beam structure L1 and a second beam structure L2 disposed on the bottom plate 11. Specifically, the first beam structure L1 encloses a first accommodating area P1, the second beam structure L2 encloses a second accommodating area P2, and the first beam structure L1 and the second beam structure L2 are disposed at intervals. The first cell module 20 is disposed in the first receiving region P1 and the second cell module 30 is disposed in the second receiving region P2. The first beam structure L1 is internally provided with a first pressure relief channel D1, the second beam structure L2 is internally provided with a second pressure relief channel D2, and the first pressure relief channel D1 is communicated with the second pressure relief channel D2.

In the battery pack 100 provided by the utility model, the capacity of the battery pack 100 can be increased by arranging the first battery cell module 20 and the second battery cell module 30. The first cell module 20 is arranged in the first accommodating area P1, the second cell module 30 is arranged in the second accommodating area P2, and the first accommodating area P1 and the second accommodating area P2 are respectively formed by surrounding the first beam structure L1 and the second beam structure L2 which are arranged at intervals, so that the first cell module 20 and the second cell module 30 which are arranged in the accommodating areas are arranged at intervals, the automobile space structure is met, and the problem of vehicle type space limitation is solved. Be equipped with first pressure release passageway D1 in the first beam structure L1, be equipped with second pressure release passageway D2 in the second beam structure L2, first pressure release passageway D1 and second pressure release passageway D2 intercommunication have set up pressure release structure on the basis of reinforcing battery package 100 structural strength, are favorable to simplifying the structure, guarantee moreover that the high temperature gas that first electric core module 20 and second electric core module 30 let out can be discharged, avoid taking place the condition of taking place with the gas after the discharge battery package 100 on fire, avoid battery package 100 thermal runaway promptly, improved the security performance of battery package 100.

In this embodiment, the first cell module 20 includes a first sub-module 21 and a second sub-module 22 that are stacked, and the second cell module 30 is a single-layer module.

It will be appreciated that the first cell module 20 is provided with a dual-layer cell module, which can further increase the capacity of the battery pack 100. The double-layer first battery cell module 20 is arranged at a position with larger automobile space, and the single-layer second battery cell module 30 is arranged at a position with smaller automobile space, so that the space in the automobile can be fully utilized, and the arrangement of the battery pack 100 is further enabled to conform to the design of automobile models.

In the present embodiment, the lower case 10 further includes a side plate 12 and a connection beam L3. One end of the side plate 12 abuts against the bottom plate 11, and a relief valve G is disposed on the side plate 12. The second beam structure L2 is disposed on a side of the first beam structure L1 remote from the side plate 12. One end of the connecting beam L3 is connected with the first beam structure L1, and the other end of the connecting beam L3 is connected with the second beam structure L2. A connecting channel D4 is arranged in the connecting beam L3, and the second pressure relief channel D2 is communicated with one end of the connecting channel D4. The other end of the connection channel D4 communicates with the first pressure relief channel D1. The first relief passage D1 communicates with the relief valve G.

The side plate 12 is provided at the rear of the electric vehicle, and the relief valve G extends toward the rear. That is, the first cell module 20 disposed on the first beam structure L1 is close to the tail of the electric vehicle, the second cell module 30 disposed on the second beam structure L2 is close to the head of the electric vehicle, and the second cell module 30 is further away from the relief valve G. The gas discharged from the second cell module 30 enters the second pressure release channel D2, and sequentially passes through the connection channel D4 and the first pressure release channel D1, and the battery pack 100 is discharged from the pressure release valve G. It can be appreciated that the second pressure relief channel D2, the connecting channel D4, and the first pressure relief channel D1 are sequentially connected, so that the pressure relief path of the second cell module 30 is prolonged. In the flowing process of the gas, the temperature is gradually reduced, so that the condition of fire when the pressure relief valve G is exhausted is avoided.

In addition, the space of the electric automobile, which is close to the cab of the head of the automobile, is smaller, and the space of the electric automobile, which is close to the tail of the automobile, is larger. The first electric core module 20 near the tail is set to be a double-layer module, the second electric core module 30 near the narrow space of the head is set to be a single-layer module, the capacity of the battery pack 100 can be increased, the battery pack 100 can be more in accordance with the space design of the whole automobile model, the space in the automobile is fully utilized, and the limitation of the automobile space to the arrangement of the electric core module is improved.

Referring to fig. 3 and 4, in the present embodiment, a side of the first cell module 20, which is close to the bottom plate 11, is enclosed with the bottom plate 11 and the first beam structure L1 to form a first pressure release cavity Q1. The first beam structure L1 includes a first cross beam H1, a first longitudinal beam Z1, a second cross beam H2, and a second longitudinal beam Z2, which are sequentially connected end to end, and the first longitudinal beam Z1 is attached to the side plate 12 and is set along the first direction X. The second stringers Z2 are arranged along the first direction X. The first beam H1 and the second beam H2 are disposed along the second direction Y. The first direction X is perpendicular to the second direction Y and parallel to the bottom plate 11.

The first pressure relief channel D1 comprises a first sub-channel D11 arranged in the first cross beam H1, a second sub-channel D12 arranged in the second longitudinal beam Z2, a third sub-channel D13 arranged in the second cross beam H2 and a fourth sub-channel D14 arranged in the first longitudinal beam Z1. One end of the first sub-channel D11 is communicated with one end of the second sub-channel D12, the other end of the second sub-channel D12 is communicated with one end of the third sub-channel D13, the other end of the third sub-channel D13 is communicated with one end of the fourth sub-channel D14, and the other end of the first sub-channel D11 is disconnected from the fourth sub-channel D14.

One end of the first sub-channel D11 is arranged at the end part of the first cross beam H1, which is close to the first longitudinal beam Z1, and one surface of the first cross beam H1, which faces the first pressure relief cavity Q1, is provided with a first pressure relief opening U1, and the first pressure relief opening U1 is positioned at the end part of the first cross beam H1, which is close to the first longitudinal beam Z1. The first pressure relief opening U1 is communicated with the first pressure relief cavity Q1 and the first sub-channel D11, and the other end of the fourth sub-channel D14 is arranged at the position of the first longitudinal beam Z1 corresponding to the pressure relief valve G.

It can be appreciated that one end of the first sub-channel D11 is disposed at an end of the first cross beam H1 near the first longitudinal beam Z1, and this end serves as an open end of the first pressure relief channel D1, and the gas in the first pressure relief cavity Q1 enters the first pressure relief channel D1 from the first pressure relief opening U1 therein. The first longitudinal beam Z1 is attached to the side plate 12, and the side plate 12 is provided with a relief valve G. One end of the fourth sub-channel D14 in the first side member Z1 is provided corresponding to the relief valve G, and this end serves as the end of the first relief channel D1 from which the gas is discharged out of the battery pack 100. The first sub-channel D11, the second sub-channel D12, the third sub-channel D13 and the fourth sub-channel D14 respectively arranged in the first cross beam H1, the second longitudinal beam Z2, the second cross beam H2 and the first longitudinal beam Z1 are sequentially connected, and the gas flows along the first cross beam H1, the second longitudinal beam Z2, the second cross beam H2 and the first longitudinal beam Z1, so that the path of gas pressure relief is prolonged. In the flowing process of the gas, the temperature is gradually reduced, so that the condition of fire when the pressure relief valve G is exhausted is avoided. The fourth sub-channel D14 is not in communication with the first sub-channel D11, so that gas does not flow directly from the first cross member H1 to the first longitudinal member Z1 and then out of the relief valve G.

Referring to fig. 5 and 6, optionally, a second pressure release cavity Q2 is formed by enclosing a side of the second cell module 30, which is close to the bottom plate 11, with the bottom plate 11 and the second beam structure L2. A plurality of second pressure relief mouths U2 have been seted up towards second pressure relief chamber Q2's medial surface to second beam structure L2, and second pressure relief mouthful U2 intercommunication second pressure relief chamber Q2 and second pressure relief passageway D2.

It is easy to understand that, a plurality of second pressure relief openings U2 are disposed on the inner wall of the second pressure relief cavity Q2 corresponding to the second core die set 30, that is, the second beam structure L2, so as to accelerate the gas discharge in the second pressure relief cavity Q2. The second cell module 30 is far away from the pressure release valve G, and the gas discharge speed is too slow, so that the inner wall of the second pressure release cavity Q2 or the second pressure release channel D2 formed by enclosing is exploded due to high temperature. The second pressure relief openings U2 are arranged, so that the explosion of the inner wall of the second pressure relief cavity Q2 or the second pressure relief channel D2 due to high temperature can be avoided.

The gas exhausted from the second cell module 30 enters the second pressure release cavity Q2 through the second pressure release opening U2, and then sequentially passes through the second pressure release channel D2, the connection channel D4 and the first pressure release channel D1 to be exhausted out of the battery pack 100.

Specifically, referring to fig. 3, the second beam structure L2 includes a third cross beam H3, a third longitudinal beam Z3, a fourth cross beam H4, and a fourth longitudinal beam Z4 that are sequentially connected end to end, where the third longitudinal beam Z3 and the fourth longitudinal beam Z4 are disposed along the first direction X, and the third cross beam H3 and the fourth cross beam H4 are disposed along the second direction Y. The second pressure relief channel D2 comprises a fifth sub-channel D21 arranged in the fourth longitudinal beam Z4, a sixth sub-channel D22 arranged in the fourth transverse beam H4 and a seventh sub-channel D23 arranged in the third longitudinal beam Z3. One end of the fifth sub-channel D21 communicates with one end of the sixth sub-channel D22, and the other end of the sixth sub-channel D22 communicates with one end of the seventh sub-channel D23.

It can be understood that no sub-channel is arranged in the third cross beam H3, and only the sub-channels which are communicated are arranged in the fourth longitudinal beam Z4, the fourth cross beam H4 and the third longitudinal beam Z3, and the two ends of the second pressure relief channel D2 extending to the third cross beam H3 are disconnected. The arrangement can prolong the path of the second pressure relief channel D2, thereby simplifying the structure while achieving pressure relief.

Alternatively, the number of the second pressure relief ports U2 may be 3, 4, 5 or 6. In the present embodiment, the number of the second pressure relief ports U2 is 4. Specifically, a second pressure relief opening U2 is disposed at the end portion of the fourth longitudinal beam Z4 near the third cross beam H3, a second pressure relief opening U2 is disposed at the end portion of the fourth longitudinal beam Z4 near the fourth cross beam H4, a second pressure relief opening U2 is disposed in the middle of the third longitudinal beam Z3, and a second pressure relief opening U2 is disposed at the end portion of the third longitudinal beam Z3 near the third cross beam H3. The positions and the number of the second pressure relief openings U2 can be set according to practical situations, which is not limited by the present utility model.

Referring to fig. 4, 6 and 7, in the present embodiment, the first cell module 20 further includes a bracket 40, the first sub-module 21 is disposed in the first accommodating area P1, the bracket 40 is disposed on the first sub-module 21, and the second sub-module 22 is disposed on the bracket 40.

Wherein the stand 40 includes a stand body 41 and a support column 42. One end of the support column 42 abuts against the support body 41, and the other end of the support column 42 abuts against one surface of the first sub-module 21. The bracket body 41 encloses a third accommodating area P3, and the second sub-module 22 is disposed in the third accommodating area P3.

It will be appreciated that by providing the bracket 40, the first sub-module 21 and the second sub-module 22 are arranged in a stacked manner. The bracket body 41 forms a third receiving area P3 to mount the second sub-module 22, and the support columns 42 form a support for the bracket body 41, so that there is enough space between the bracket body 41 and the first beam structure L1 to mount the battery cells.

Further, the first sub-module 21 includes a tray 211 and a battery cell group 212 disposed in the tray 211. The tray 211 includes a housing cavity 2111 and lifting lugs 2112 provided outside the periphery of the housing cavity 2111. The lifting lug 2112 is connected to the first beam structure L1. The lifting lug 2112 is provided with a detent J on a side remote from the first beam structure L1. One end of the support column 42 abuts against the bottom of the positioning groove J.

Specifically, the tray 211 is used for installing the battery cell group 212, and the lifting lug 2112 is used for being fixedly connected with the first beam structure L1. The first sub-module 21 is connected to the first beam structure L1 by lifting lugs 2112. The first beam structure L1 is provided with a rivet stud connected with the tray 211, so that the first sub-module 21 and the first beam structure L1 are fixedly connected, and the structural strength of the battery pack 100 is further improved. By fixing the lifting lug 2112 to the first beam structure L1, a certain space exists between the bottom of the accommodating cavity 2111 of the first sub-module 21 and the bottom plate 11, so as to form a first pressure release cavity Q1.

The positioning groove J is used for positioning the support column 42. A positioning slot J corresponds to a supporting column 42. The side walls of the positioning groove J define the support column 42, so that the positioning is realized, and the installation is convenient. The bottom of the positioning groove J forms a support for the support column 42.

In the present embodiment, a surface of the second sub-module 22, which is close to the bracket body 41, is enclosed with the bracket body 41 to form a third pressure release cavity Q3. The support main body 41 is provided with a pressure relief hole K communicated with the third pressure relief cavity Q3, and a third pressure relief channel D3 communicated with the pressure relief hole K is arranged in the support column 42. The third pressure relief channel D3 is communicated with the first pressure relief channel D1, and the first pressure relief channel D1 is communicated with the pressure relief valve G.

It can be appreciated that the first sub-module 21 and the second sub-module 22 are stacked, the third pressure release channel D3 is set through the support column 42 between the two layers of modules, the third pressure release channel D3 is communicated with the third pressure release cavity Q3, and the high-temperature gas discharged by the second sub-module 22 can flow along the third pressure release channel D3 to emit heat in the flowing process. The third pressure release channel D3 is further communicated with the first pressure release channel D1, and the gas exhausted by the second sub-module 22 passes through the first pressure release channel D1 and is exhausted out of the battery pack 100 through the pressure release valve G. The third pressure release channel D3 is provided to release the gas discharged from the second sub-module 22 stacked on the first sub-module 21 out of the battery pack 100. And because the third pressure release channel D3 prolongs the pressure release path, the heat is released in the gas flow process, the condition that the gas fires after being discharged out of the battery pack 100 can be avoided, the thermal runaway of the battery pack 100 is avoided, and the safety performance of the battery pack 100 is improved.

Because the end of the support column 42 abuts against the bottom of the positioning groove J, a through hole corresponding to the third pressure relief channel opening is formed in the bottom of the positioning groove J, so that the gas can enter the first pressure relief channel D1 from the third pressure relief channel D3.

In this embodiment, the inner surfaces of the first pressure relief channel D1 and the second pressure relief channel D2 are provided with a flame retardant layer (not shown). Also, a flame retardant layer (not shown) may be provided on the inner surface of the third pressure relief passage D3.

It is easy to understand that the flame retardant layer (not shown) is arranged on the inner surface of the pressure relief channel, so that the fireproof performance of the pressure relief channel can be improved, and the explosion caused by high-temperature gas can be avoided.

In the present embodiment, the material of the first beam structure L1 and the second beam structure L2 is steel.

It can be appreciated that steel is relatively low cost, high strength, and good resistance to penetration by molten steel relative to materials such as aluminum. Steel is used as a material of the beam structure connecting the lower case 10, and the strength of the entire lower case 10 can be improved. The first pressure relief channel D1 and the second pressure relief channel D2 are respectively arranged inside the first beam structure L1 and the second beam structure L2, so that the wall thickness of the first beam structure L1 and the wall thickness of the second beam structure L2 are reduced, the quality of the lower box body 10 can be reduced, and the cross-sectional area of the pressure relief channel is ensured.

The first and second beam structures L1 and L2 made of steel may be spot welded to the lower case 10.

Referring to fig. 8, the battery pack 100 may further include an upper cover, as an option. The upper cover encloses the lower case 10 to accommodate the first cell module 20 and the second cell module 30.

The utility model provides a battery pack which comprises a lower box body, a first battery cell module and a second battery cell module. The first battery cell module and the second battery cell module are arranged, so that the battery pack capacity can be increased. The lower box body comprises a bottom plate, a first beam structure and a second beam structure, wherein the first beam structure and the second beam structure are arranged on the bottom plate. The first beam structure encloses into first accommodation area, and the second beam structure encloses into second accommodation area, and first beam structure and second beam structure interval set up. The first electric core module is arranged in the first accommodating area, and the second electric core module is arranged in the second accommodating area, so that the first electric core module and the second electric core module are arranged at intervals, the automobile space structure is met, and the problem of vehicle type space limitation is solved. Be equipped with first pressure release passageway in the first roof beam structure, be equipped with the second pressure release passageway in the second roof beam structure, first pressure release passageway and second pressure release passageway intercommunication have set up pressure release structure on the basis of reinforcing battery package structural strength, guarantee that the high temperature gas that first electric core module and second electric core module were let out can discharge, avoid taking place with the condition of taking place of gas discharge battery package back fire, avoid battery package thermal runaway promptly, improved the security performance of battery package.

The foregoing has outlined rather broadly the more detailed description of embodiments of the utility model, wherein the principles and embodiments of the utility model are explained in detail using specific examples, the above examples being provided solely to facilitate the understanding of the method and core concepts of the utility model; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present utility model, the present description should not be construed as limiting the present utility model.

Claims (10)

1. A battery pack, the battery pack comprising:

the lower box body comprises a bottom plate, a first beam structure and a second beam structure, wherein the first beam structure and the second beam structure are arranged on the bottom plate, the first beam structure is enclosed into a first accommodating area, the second beam structure is enclosed into a second accommodating area, the first beam structure and the second beam structure are arranged at intervals, a first pressure release channel is arranged in the first beam structure, a second pressure release channel is arranged in the second beam structure, and the first pressure release channel is communicated with the second pressure release channel;

a first cell module disposed in the first containment region; and

and the second battery cell module is arranged in the second accommodating area.

2. The battery pack of claim 1, wherein the first cell module comprises a first sub-module and a second sub-module in a stacked arrangement, the second cell module being a single layer module.

3. The battery pack of claim 1, wherein the lower case further comprises side plates and connection beams;

one end of the side plate is abutted against the bottom plate, a pressure relief valve is arranged on the side plate, and the second beam structure is arranged on one side, far away from the side plate, of the first beam structure;

the one end of tie-beam is connected first roof beam structure, the other end of tie-beam is connected second roof beam structure, be equipped with the connecting channel in the tie-beam, the second pressure release passageway with the one end intercommunication of connecting channel, the other end of connecting channel with first pressure release passageway intercommunication, first pressure release passageway with the relief valve intercommunication.

4. The battery pack according to claim 3, wherein one surface of the first battery cell module, which is close to the bottom plate, is enclosed with the bottom plate and the first beam structure to form a first pressure release cavity, the first beam structure comprises a first cross beam, a first longitudinal beam, a second cross beam and a second longitudinal beam which are sequentially connected end to end, the first longitudinal beam is attached to the side plate and arranged along a first direction, the second longitudinal beam is arranged along the first direction, the first cross beam and the second cross beam are arranged along a second direction, and the first direction is perpendicular to the second direction and parallel to the bottom plate;

the first pressure relief channel comprises a first sub-channel arranged in the first cross beam, a second sub-channel arranged in the second longitudinal beam, a third sub-channel arranged in the second cross beam and a fourth sub-channel arranged in the first longitudinal beam, one end of the first sub-channel is communicated with one end of the second sub-channel, the other end of the second sub-channel is communicated with one end of the third sub-channel, the other end of the third sub-channel is communicated with one end of the fourth sub-channel, and the other end of the first sub-channel is disconnected from the fourth sub-channel;

one end of the first sub-channel is arranged at the end part of the first cross beam, which is close to the first longitudinal beam, a first pressure relief opening is formed in one face of the first cross beam, which faces the first pressure relief cavity, the first pressure relief opening is positioned at the end part of the first cross beam, which is close to the first longitudinal beam, the first pressure relief opening is communicated with the first pressure relief cavity and the first sub-channel, and the other end of the fourth sub-channel is arranged at the position, corresponding to the pressure relief valve, of the first longitudinal beam.

5. The battery pack of claim 3, wherein a side of the second cell module, which is close to the bottom plate, is enclosed with the bottom plate and the second beam structure to form a second pressure relief cavity, and a plurality of second pressure relief openings are formed in the second beam structure towards the inner side surface of the second pressure relief cavity, and the second pressure relief openings are communicated with the second pressure relief cavity and the second pressure relief channel.

6. The battery pack of claim 2, wherein the first cell module further comprises a bracket, the first sub-module is disposed in the first receiving area, the bracket is disposed on the first sub-module, and the second sub-module is disposed on the bracket;

the support comprises a support main body and a support column, one end of the support column is abutted against the support main body, the other end of the support column is abutted against one face of the first sub-module, the support main body is enclosed into a third accommodating area, and the second sub-module is arranged in the third accommodating area.

7. The battery pack according to claim 6, wherein the first sub-module comprises a tray and a battery cell group arranged in the tray, the tray comprises a containing cavity and a lifting lug arranged on the outer side of the periphery of the containing cavity, the lifting lug is connected to the first beam structure, a positioning groove is formed in one surface, away from the first beam structure, of the lifting lug, and one end of the supporting column is abutted to the bottom of the positioning groove.

8. The battery pack according to claim 6, wherein the lower case is provided with a pressure release valve, one surface of the second sub-module, which is close to the support main body, encloses with the support main body to form a third pressure release cavity, the support main body is provided with a pressure release hole communicated with the third pressure release cavity, the support column is internally provided with a third pressure release channel communicated with the pressure release hole, the third pressure release channel is communicated with the first pressure release channel, and the first pressure release channel is communicated with the pressure release valve.

9. The battery pack according to any one of claims 1 to 8, wherein the inner surfaces of the first pressure relief channel and the second pressure relief channel are provided with a flame retardant layer.

10. The battery pack of any one of claims 1-8, wherein the material of the first beam structure and the second beam structure is steel.