CN216793916U

CN216793916U - Battery pack

Info

Publication number: CN216793916U
Application number: CN202220225201.1U
Authority: CN
Inventors: 王一宇; 李忠建
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2022-01-26
Filing date: 2022-01-26
Publication date: 2022-06-21
Anticipated expiration: 2032-01-26

Abstract

The utility model discloses a battery pack, which comprises: box and electric core module. The box includes: the bottom plate and the boundary beam define an accommodating space, the accommodating space is divided into a plurality of subspaces by the separation beam, and the height of the boundary beam is smaller than or equal to that of the separation beam. The battery cell modules are arranged in the subspaces correspondingly, each battery cell module is provided with a plurality of battery cells, and the poles and the explosion-proof valves of the battery cells are positioned on different sides of the battery cells. From this, when a certain electric core takes place the thermal runaway, electric core can produce gas fire stream and flue gas, because the separation of separation roof beam, the thermal runaway scope of electric core is restricted in the subspace at thermal runaway's electric core place, again because the height less than or equal to of boundary beam separates the height of roof beam, after the battery package encapsulation, separates the roof beam and can carry out effectual isolation to flue gas and gas fire stream to effective control electric core thermal runaway's scope.

Description

Battery pack

Technical Field

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

Background

With the continuous maturation of the technology, the market share of the pure electric vehicle is larger and larger, but the safety of the battery core is always a technical difficulty. Electric core is because overcharge or the collision leads to the unstability of temperature, takes place the thermal runaway phenomenon easily, can produce a large amount of flue gases and heat behind electric core thermal runaway, if can not in time derive gas outgoing or heat, electric core very easily explodes. In prior art, often with the position level of explosion-proof valve up, place on the coplanar with electric core utmost point post, when electric core takes place thermal runaway like this, the gas of injection is scattered all around in the battery package, leads to electric core thermal runaway's the speed that stretches to accelerate.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a battery pack, which, when a thermal runaway occurs in a battery cell, can block off smoke generated by the battery cell and smoothly discharge the smoke from the interior of the battery pack, so as to reduce the influence of high-temperature smoke on other battery cells and delay the propagation speed of the thermal runaway of the battery cell.

The battery pack according to an embodiment of the present invention includes: box and electric core module. The box body comprises: the bottom plate and the boundary beam define an accommodating space, the accommodating space is divided into a plurality of subspaces by the separation beam, and the height of the boundary beam is less than or equal to that of the separation beam; the battery cell modules are arranged in the subspaces correspondingly and are provided with a plurality of battery cells, and the polar columns and the explosion-proof valves of the battery cells are positioned on different sides of the battery cells.

According to the battery pack provided by the embodiment of the utility model, a plurality of battery cells form a battery cell module, the plurality of battery cell modules are respectively arranged in a plurality of subspaces, each subspace is partitioned by the partitioning beam, when a certain battery cell is out of control due to heat, the battery cell can generate gas-fire flow and smoke, due to the blocking of the partitioning beam, the thermal runaway range of the battery cell is limited in the subspace where the out-of-control battery cell is located, and due to the fact that the height of the side beam is smaller than or equal to that of the partitioning beam, after the battery pack is packaged, the partitioning beam can effectively isolate the smoke and the gas-fire flow, and therefore the thermal runaway range of the battery cell is effectively controlled.

In some embodiments, the separation beam and the boundary beam are both configured as a hollow structure, the boundary beam defines a smoke exhaust channel, the separation beam defines a smoke channel communicated with the smoke exhaust channel, a smoke inlet is arranged on the separation beam, the pole and the explosion-proof valve are located on a side surface adjacent to the electric core, and a side surface of the electric core, on which the explosion-proof valve is arranged, is opposite to the separation beam and at least partially coincides with the smoke inlet.

In some embodiments, the partition beam comprises: the flue gas purification device comprises a beam body and a partition plate arranged in the beam body, wherein the partition plate is used for dividing the flue gas channel into a first sub-channel and a second sub-channel which are spaced.

In some embodiments, the edge beam comprises: the extension direction of the cross beam is consistent with that of the separation beam, and exhaust ports for exhausting smoke are arranged at two ends of the cross beam.

Optionally, a safety valve is provided on the discharge port.

In some embodiments, the number of the flue gas inlets is multiple, and each flue gas inlet is arranged corresponding to one of the battery cells.

Further, the width of the flue gas inlet is smaller than or equal to the width between two adjacent explosion-proof valves in the electric core module.

Optionally, the flue gas inlet is opposite to the explosion-proof valve, and a sealing element is arranged around the flue gas inlet.

In some embodiments, the battery pack further comprises: and the flame-retardant layer is arranged between the battery cell module and the boundary beam.

In some embodiments, the case further comprises: the top plate covers the boundary beam and is attached to the separation beam.

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 above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a perspective view schematically illustrating a battery pack according to an embodiment of the present invention.

Fig. 2 is a front view of a case of the battery pack according to the embodiment of the present invention.

Fig. 3 is a front view of a battery pack according to an embodiment of the present invention.

Fig. 4 is a side view of a battery pack according to an embodiment of the present invention.

Fig. 5 is a cross-sectional view at a-a in fig. 3.

Fig. 6 is a sectional view at B-B in fig. 4.

Fig. 7 is a partial enlarged view at C in fig. 5.

Fig. 8 is a partial enlarged view at D in fig. 5.

Reference numerals:

a battery pack 100,

A box body 10, a bottom plate 11,

The boundary beam 12, the smoke evacuation path 121, the cross beam 122, the exhaust port 1221, the safety valve 1222, the longitudinal beam 123, the,

The partition beam 13, the flue gas channel 131, the first sub-channel 1311, the second sub-channel 1312, the flue gas inlet 132, the beam body 133, the partition 134,

A subspace 14, a seal 15,

A battery cell module 20, a battery cell 21, a pole 211, an explosion-proof valve 212,

A flame-retardant layer 30,

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

A battery pack 100 according to an embodiment of the present invention is described below with reference to fig. 1 to 7.

As shown in fig. 1 to 3, a battery pack 100 according to an embodiment of the present invention includes: a case 10 and a cell module 20. The case 10 includes: the bottom plate 11 and the boundary beam 12 define an accommodating space, the accommodating space is divided into a plurality of subspaces 14 by the partition beam 13, and the height of the boundary beam 12 is less than or equal to that of the partition beam 13. The battery cell modules 20 are multiple and correspondingly arranged in the sub-spaces 14, each battery cell module 20 has multiple battery cells 21, and the poles 211 of the battery cells 21 and the explosion-proof valves 212 are located on different sides of the battery cells 21.

According to the battery pack 100 of the embodiment of the present invention, a plurality of battery cells 21 form a battery cell module 20, the plurality of battery cell modules 20 are respectively disposed in the plurality of subspaces 14, each subspace 14 is partitioned by the partition beam 13, when a certain battery cell 21 is out of control due to thermal runaway, the battery cell 21 may generate gas-fire current and smoke, due to the blocking of the partition beam 13, the thermal runaway range of the battery cell 21 is limited in the subspace 14 where the battery cell 21 out of control due to thermal runaway, and the propagation speed of the thermal runaway of the battery cell 21 can be delayed to a certain extent. And because the height of the boundary beam 12 is less than or equal to the height of the separation beam 13, after the battery pack 100 is packaged, the separation beam 13 can effectively isolate the smoke and the gas-fire flow, so that the smoke and the gas-fire flow are prevented from spreading to the adjacent subspaces 14, and the thermal runaway range of the battery cell 21 is effectively controlled.

Wherein, preferably, the utmost point post 211 of electric core 21 is located a terminal surface, the explosion-proof valve 212 of electric core 21 is located on the side adjacent with a terminal surface, when electric core 21 takes place the thermal runaway, explosion-proof valve 212 opens, electric core 21 is inside can produce gas fire stream or flue gas and discharge from explosion-proof valve 212, spun gas fire stream or flue gas are perpendicular with the direction of electric core 21 utmost point post 211 mutually, the sputtering of gas fire stream at this moment obtains very big reduction to the influence of utmost point post 211, thereby prevent the potential safety hazard because electric core 21 short circuit causes, reduce electric core 21 thermal runaway's influence scope, increase the security.

As shown in fig. 3 to 6, in some embodiments, the partition beam 13 and the boundary beam 12 are both configured as a hollow structure, the boundary beam 12 defines the smoke evacuation channel 121, the partition beam 13 defines the smoke channel 131 communicated with the smoke evacuation channel 121, the partition beam 13 is provided with the smoke inlet 132, the pole 211 and the explosion-proof valve 212 are located on a side surface of the electric core 21 adjacent to each other, and a side surface of the electric core 21 provided with the explosion-proof valve 212 is opposite to the partition beam 13 and at least partially coincides with the smoke inlet 132.

As the direction that the arrow in fig. 6 points, when a certain electric core 21 takes place the thermal runaway, explosion-proof valve 212 opens, the flue gas is discharged from explosion-proof valve 212 and gets into in the flue gas passageway 131 in the partition beam 13 through flue gas inlet 132, the flue gas passageway 131 of partition beam 13 communicates with the smoke evacuation passageway 121 of boundary beam 12 each other, the flue gas gets into smoke evacuation passageway 121 from flue gas passageway 131, so that the flue gas that electric core 21 produced smoothly discharges from electric core module 20, reduce the influence of flue gas to electric core 21 on every side, reduce electric core 21 thermal runaway's the speed of stretching, provide time for personnel's escape, increase the security.

Utmost point post 211 is located the adjacent side of electric core 21 with explosion-proof valve 212, and when electric core 21 took place thermal runaway, the flue gas passed through explosion-proof valve 212 and gets into flue gas channel 131 and smoke exhaust channel 121 in, can avoid taking place the contact with utmost point post 211 to guarantee better security.

Preferably, the side surface of the explosion-proof valve 212 arranged on the battery cell 21 is arranged opposite to the smoke inlet 132 on the separation beam 13. Therefore, thermal runaway can occur in the battery cell 21, the efficiency of flue gas discharge is increased when the anti-explosion valve 212 discharges flue gas, the spreading speed of the thermal runaway of the battery cell 21 is delayed, and the safety is improved.

The partition beams 13 and the edge beams 12 having a hollow structure can reduce the weight of the entire battery pack 100 while providing structural support for the cell modules 20. In practical application, the battery pack 100 can be installed in an electric automobile, and the smaller weight of the battery pack 100 can enable the electric automobile to load more battery cores 21 under the same weight, so that the endurance mileage of the electric automobile is improved, the driving range of the electric automobile is larger, and the user experience is increased.

As shown in fig. 7, in some embodiments, the partition beam 13 includes: a beam 133 and a partition 134 arranged in the beam 133, the partition 134 being adapted to divide the flue gas channel 131 into a first and a second spaced

sub-channel

1311, 1312. The partition beam 13 divides the accommodating space into a plurality of subspaces 14, the cell modules 20 are installed in the subspaces 14, namely, the cell modules 20 are partitioned by the partition beam 13, the explosion-proof valves 212 of each cell 21 in the cell modules 20 are all just opposite to the smoke inlet 132 of the partition beam 13, the explosion-proof valves 212 of the opposite cells 21 on two sides of the partition beam 13 are just opposite to the position, and the partition plate 134 is arranged in the partition beam 13 to separate smoke. When a certain electric core 21 is out of control due to heat, high-temperature flue gas enters the separation beam 13 through the explosion-proof valve 212, and due to the blocking of the separation beam 13, the flue gas enters the first sub-channel 1311 or the second sub-channel 1312, so that the electric core 21 just opposite to the electric core 21 cannot be affected by the high-temperature flue gas, the influence range of the out of control due to heat of the electric core 21 can be reduced, the spreading speed of the out of control due to heat is reduced, and the safety is improved.

The partition beam 13 is partitioned into the first sub-channel 1311 and the second sub-channel 1312, so that smoke can be discharged when the plurality of battery cells 21 are in thermal runaway, and the smoke discharging efficiency of the first sub-channel 1311 and the second sub-channel 1312 cannot be affected, so that the smoke discharging efficiency of the battery pack 100 is increased when the thermal runaway occurs, time is provided for people to escape, and safety is improved.

As shown in fig. 8, in some embodiments, the edge beam 12 includes: the extension direction of the cross beam 122 is consistent with that of the partition beam 13, and two ends of the cross beam 122 are provided with exhaust ports 1221 for exhausting smoke. Through the connection of the cross beam 122, the longitudinal beam 123 and the partition beam 13, the battery pack 100 can have higher structural strength, and when the cell modules 20 are placed in the sub-space 14, the cell modules 20 can be better fixed, so that the safety of the battery pack 100 is improved. When cell 21 generates the thermal runaway and produces the flue gas, the flue gas is discharged into smoke exhaust channel 121 along first sub-channel 1311 or second sub-channel 1312, the flue gas firstly enters longitudinal beam 123, and then enters cross beam 122 after passing through longitudinal beam 123, and discharge ports 1221 arranged at two ends of cross beam 122 can discharge the flue gas out of battery pack 100, so that the flue gas is prevented from spreading in battery pack 100 to cause the aggravation of the thermal runaway, the spreading speed of cell 21 is reduced, and the safety is improved.

In battery pack 100 practical application, battery pack 100 not only includes electric core 21, still includes other automatically controlled devices and various pipelines, sets up discharge port 1221 at the both ends of crossbeam 122, can make the flue gas can discharge battery pack 100 when getting into crossbeam 122, can prevent that the high temperature flue gas from causing the influence to pipeline and automatically controlled device when improving flue gas exhaust efficiency, reduces electric core 21 thermal runaway's influence scope to reduce the loss.

As shown in fig. 8, a relief valve 1222 is optionally provided on the discharge port 1221. When the battery cell 21 is not out of thermal runaway, the safety valve 1222 on the outlet 1221 can seal the box 10 to prevent dust or water from entering the boundary beam 12 and the separation beam 13, and further protect the explosion-proof valve 212 on the battery cell 21, so that the explosion-proof valve 212 can be smoothly opened when the battery cell 21 is out of thermal runaway, and the safety of the battery pack 100 is improved. When electric core 21 takes place the thermal runaway, the flue gas passes through flue gas passageway 131, exhaust passage and reaches discharge port 1221, and relief valve 1222 is opened at this moment and can be discharged the flue gas, reduces the flue gas volume in the battery package 100 to reduce the speed of stretching of thermal runaway, increase the security.

It should be noted that the type of the safety valve 1222 is not particularly limited, and the safety valve 1222 may be the explosion-proof valve 212. When the battery cell 21 is out of thermal runaway, the flue gas can be smoothly discharged out of the battery pack 100.

In some embodiments, the number of the smoke inlets 132 is multiple, and each smoke inlet 132 is disposed corresponding to one of the battery cells 21. From this, when electric core 21 takes place the thermal runaway, explosion-proof valve 212 opens the back flue gas and gets into flue gas channel 131 through corresponding gas inlet 132, and when the electric core 21 quantity that takes place the thermal runaway was more, every electric core 21 corresponds a gas inlet 132, can increase gas exhaust efficiency of flue gas channel 131, prevents to lead to the local temperature too high to cause the explosion owing to the flue gas can't in time discharge, increases battery package 100's security.

Optionally, the size of the flue gas inlet 132 is larger than that of the explosion-proof valve 212, when the battery cell 21 generates flue gas due to thermal runaway, the flue gas can impact the explosion-proof valve 212, the size of the flue gas inlet 132 is larger than that of the explosion-proof valve, and the impacted explosion-proof valve 212 cannot be blocked when the explosion-proof valve is broken, so that the flue gas can be discharged more smoothly from the flue gas channel 131, and explosion caused by blockage of the explosion-proof valve 212 is prevented, and the safety is improved. When the flue gas is discharged into the flue gas channel 131, the flue gas inlet 132 with a larger size cannot obstruct the flue gas, so that the efficiency of discharging the flue gas can be increased, and the spreading time of thermal runaway can be further delayed.

Further, the width of the flue gas inlet 132 is smaller than or equal to the width between two adjacent explosion-proof valves 212 in the cell module 20. When electric core 21 takes place thermal runaway, the flue gas passes through in flue gas inlet 132 sprays and gets into flue gas channel 131, and the flue gas can form the scattering of certain angle after passing through flue gas inlet 132, sets up the width of flue gas inlet 132 into the width of two adjacent explosion-proof valves 212 of less than or equal to, can prevent that the flue gas after the scattering from causing the influence to electric core 21 in the adjacent flue gas inlet 132, reduces electric core 21 thermal runaway's influence scope, increases the security.

The partition beam 13 is provided with a plurality of flue gas inlets 132 at intervals along the length direction, the width of the flue gas inlets 132 is set to be less than or equal to the width between two adjacent anti-explosion valves 212, so that the partition beam 13 has higher structural strength while having higher discharge efficiency to flue gas, the battery cell module 20 is more stable in the battery pack 100, and the safety of the battery pack 100 is improved.

As shown in fig. 7, optionally, the explosion-proof valve 12 of the flue gas inlet 132 is opposite to and a sealing member 15 is arranged around the flue gas inlet 132.

Specifically, the seals 15 may space adjacent cells 21 within the same cell module 20. From this, when a certain electricity core 21 takes place the thermal runaway, the flue gas passes through explosion-proof valve 212 and discharges to flue gas channel 131 in, sealing member 15 can seal adjacent electricity core 21, because the flue gas has pressure when blowout from explosion-proof valve 212, the flue gas can take place the bounce-back after spraying on the baffle 134 in the partition beam 13, sealing member 15 can prevent that the flue gas of bounce-back from causing the influence to adjacent electricity core 21 to reduce the scope of thermal runaway, increase the security.

As shown in fig. 8, in some embodiments, the battery pack 100 further includes: and the flame-retardant layer 30 is arranged between the battery cell module 20 and the boundary beam 12. Because the flue gas has high temperature, and the flue gas probably has the stream of gas fire when discharging in flue gas passageway 131 and the exhaust passage 121 through explosion-proof valve 212, when the great high temperature flue gas of the more production of electric core 21 of thermal runaway, boundary beam 12 and partition beam 13 can be heated rapidly, if the unable battery package 100 of discharging fast of flue gas this moment, can accumulate a large amount of heats in flue gas passageway 131 and exhaust passage 121, one side of boundary beam 12 and battery package 100 contact can be with thermal conduction to not taking place on the electric core 21 of thermal runaway through heat-conduction, a large amount of heats can make electric core 21 have the risk of taking place the thermal runaway, it can effectively obstruct the heat to set up fire-retardant layer 30 between boundary beam 12 and electric core module 20, reduce the risk that electric core 21 takes place the thermal runaway, the security improves.

In some embodiments, the case 10 further comprises: and a top plate (not shown) which covers the edge beam 12 and is attached to the partition beam 13. Through roof, bottom plate 11 and boundary beam 12, can encapsulate battery package 100 to can protect electric core 21 in the battery package 100, prevent that in use from taking place to collide with and causing electric core 21 to damage, increase battery package 100's security. Roof and the setting of laminating of dividing roof beam 13, when a certain electric core 21 takes place the thermal runaway, roof and the laminating department of dividing roof beam 13 can make subspace 14 keep mutual independence to reduce electric core 21 thermal runaway's influence scope, increase the security.

In the description of the present invention, it is to be understood that the terms "length," "thickness," "upper," "lower," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the purpose of convenience and simplicity of description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present invention. In the description of the present invention, "the first feature" and "the second feature" may include one or more of the features. In the description of the present invention, "a plurality" means two or more. In the description of the present invention, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, and may also include the first and second features being in contact with each other not directly but through another feature therebetween. In the description of the utility model, "above", "over" and "above" a first feature in a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean 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, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. 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 utility model have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery pack, comprising:

a case (10), the case (10) comprising: the side beam type solar cell comprises a bottom plate (11), a side beam (12) and a separating beam (13), wherein the bottom plate (11) and the side beam (12) define an accommodating space, the accommodating space is divided into a plurality of subspaces (14) by the separating beam (13), and the height of the side beam (12) is less than or equal to that of the separating beam (13);

the battery cell module (20) is provided with a plurality of battery cell modules (20) which are correspondingly arranged in the subspace (14), the battery cell module (20) is provided with a plurality of battery cells (21), and a pole column (211) of each battery cell (21) and the explosion-proof valve (212) are positioned on different side faces of the battery cells (21).

2. The battery pack according to claim 1, wherein the separation beam (13) and the boundary beam (12) are each configured as a hollow structure, the boundary beam (12) defines a smoke exhaust channel (121), the separation beam (13) defines a smoke channel (131) communicated with the smoke exhaust channel (121), the separation beam (13) is provided with a smoke inlet (132), the terminal post (211) and the explosion-proof valve (212) are located on the side surface adjacent to the battery cell (21), and the side surface of the battery cell (21) provided with the explosion-proof valve (212) is opposite to the separation beam (13) and at least partially coincides with the smoke inlet (132).

3. The battery pack according to claim 2, wherein the partition beam (13) includes: the flue gas purification device comprises a beam body (133) and a partition plate (134) arranged in the beam body (133), wherein the partition plate (134) is used for dividing the flue gas channel (131) into a first sub-channel (1311) and a second sub-channel (1312) which are spaced.

4. The battery pack according to claim 2, wherein the edge beam (12) comprises: the smoke-removing device comprises a cross beam (122) and a longitudinal beam (123) which are connected end to end, the extending direction of the cross beam (122) is consistent with that of the separating beam (13), and discharge ports (1221) for discharging smoke are arranged at two ends of the cross beam (122).

5. The battery pack according to claim 4, wherein a safety valve (1222) is provided on the discharge port (1221).

6. The battery pack according to claim 2, wherein the number of the smoke inlets (132) is plural, and each smoke inlet (132) is provided corresponding to one of the battery cells (21).

7. The battery pack according to claim 6, wherein the width of the flue gas inlet (132) is less than or equal to the width between two adjacent explosion-proof valves (212) in the cell modules (20).

8. The battery pack according to claim 7, wherein the smoke inlet (132) is directly opposite to the explosion-proof valve (212), and a sealing member (15) is provided around the smoke inlet (132).

9. The battery pack of claim 1, further comprising: a flame retardant layer (30), the flame retardant layer (30) disposed between the cell module (20) and the edge beam (12).

10. The battery pack according to any one of claims 1 to 9, wherein the case (10) further comprises: the top plate covers the edge beam (12) and is attached to the separation beam (13).