CN218005154U - Battery pack and vehicle with same - Google Patents

Abstract

The utility model discloses a battery package and have its vehicle, the battery package includes box, a plurality of battery module and a plurality of pressure release passageway, the battery module with pressure release passageway all establishes in the box, every the battery module corresponds at least one pressure release passageway sets up. The utility model discloses battery package has that the security is good, light in weight and advantage such as with low costs.

Description

Battery pack and vehicle with same

Technical Field

The utility model relates to a power battery technical field, concretely relates to battery package and have its vehicle.

Background

When the battery core in the battery pack is out of control due to heat, the smoke (high-temperature smoke) generated by the battery core and the charged jet are easy to damage the nearby battery core and other electric devices, so that the whole battery pack is out of control due to heat spreading. At present, the thermal spreading speed of the battery cell in thermal runaway is reduced and the safety of the battery pack is improved mostly by increasing the input of thermal protection materials. For example, the weight and cost of the battery pack are increased by increasing the number of the explosion-proof valves, increasing the thickness of the heat insulation board (such as a mica board), and adhering mica tapes on the surfaces of copper bars, wire harnesses and electric devices. In the correlation technique, not set up the pressure release passageway that corresponds with the battery module in the battery package, cause the unable quick discharge of high temperature flue gas that electric core produced and random stretching in the battery package, lead to the security of battery package lower.

SUMMERY OF THE UTILITY MODEL

The present invention aims at solving one of the technical problems in the related art at least to a certain extent.

Therefore, the embodiment of the present invention provides a battery pack to improve the safety of the battery pack.

An embodiment of the utility model provides a vehicle with above-mentioned battery package.

The utility model discloses battery package includes box, a plurality of battery module and a plurality of pressure release passageway, the battery module with pressure release passageway all establishes in the box, every the battery module corresponds at least one pressure release passageway sets up.

The utility model discloses battery pack for when the battery module takes place the thermal runaway, the flue gas that the electric core of this battery module produced can only flow along pressure release channel's extending direction (for example fore-and-aft direction), and the flue gas of avoiding the battery module to produce even from the leisurely reduction spreads other battery module departments. On one hand, the smoke can be prevented from spreading to other battery modules which are not subjected to thermal runaway, the safety of the battery modules which are not subjected to the thermal runaway is improved, and the safety of the whole battery pack is improved; on the other hand, under the condition of avoiding the flue gas to stretch in the battery package irregularly, can reduce the use amount of protection material in the battery package, alleviate the weight of battery package and reduce the cost of battery package. The utility model discloses battery package has that the security is good, light in weight and advantage such as with low costs.

In some embodiments, the box body comprises a lower box body and an upper cover arranged on the lower box body, the lower box body comprises a plurality of longitudinal beams, the longitudinal beams are arranged at intervals, the battery module is arranged between two adjacent longitudinal beams, the bottom surface of the upper cover is in sealing fit with the top surfaces of the longitudinal beams, the top surfaces of the battery modules are arranged at intervals with the bottom surface of the upper cover, and the pressure relief channel is formed among the battery module, the upper cover and two adjacent longitudinal beams.

In some embodiments, the battery module comprises a module body and a partition plate arranged at the top of the module body, the top surface of the partition plate is arranged at an interval with the bottom surface of the upper cover, the side surface of the partition plate is in sealing fit with the side surface of the longitudinal beam, the partition plate, the upper cover and two adjacent longitudinal beams form the pressure relief channel, and the partition plate is provided with a thinned part.

In some embodiments, the thinned portion is elongated; or the thinning part is provided with a plurality of thinning parts which are arranged at intervals.

In some embodiments, the battery module comprises a plurality of battery cells, a battery cell explosion-proof valve is arranged at the top of each battery cell, and the thinning part is arranged right above the battery cell explosion-proof valve.

In some embodiments, the lower box body comprises a plurality of edge cross beams and a box body explosion-proof valve, the longitudinal beams are arranged between two adjacent edge cross beams, the edge cross beams are arranged at intervals, at least one edge cross beam is provided with a pressure relief hole, each battery module is communicated with the box body explosion-proof valve through the corresponding pressure relief channel, the box body explosion-proof valve is arranged on the pressure relief hole, the battery pack further comprises a cooling fin, the cooling fin is arranged in the lower box body, the cooling fin is covered on the pressure relief hole, and the cooling fin is provided with a plurality of airflow through holes.

In some embodiments, the heat sink includes a first portion, a second portion, and a third portion connected in series, the first portion and the third portion being connected to the rim beam, the second portion being spaced apart from the rim beam.

In some embodiments, the lower box body further comprises a plurality of middle cross beams, the middle cross beams are arranged between two adjacent edge cross beams, the middle cross beams are arranged at intervals, two ends of each longitudinal beam are respectively connected with the two adjacent middle cross beams, and the bottom surface of the upper cover is arranged at intervals with the top surfaces of the middle cross beams.

In some embodiments, the thickness of the spacer is 0.8mm to 1.2mm, and the thickness of the thinning portion is 0.2mm to 0.4mm.

The vehicle of the embodiment of the utility model comprises the battery pack of any one of the above embodiments.

The utility model discloses the vehicle has that the security is good and advantage such as journey mileage is long.

Drawings

Fig. 1 is a schematic structural diagram of a battery pack according to an embodiment of the present invention.

Fig. 2 is a schematic view of the structure of fig. 1 with the upper cover hidden.

Fig. 3 is an exploded view of fig. 1.

Fig. 4 is a schematic structural diagram of a pressure relief channel of a battery pack according to an embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a battery pack according to an embodiment of the present invention.

Fig. 6 is a schematic structural diagram of an explosion-proof valve of a box of a battery pack according to an embodiment of the present invention.

Reference numerals:

a battery pack 100;

a lower box body 1; a stringer 101; a middle longitudinal beam 1011; edge stringers 1012; a cross beam 102; a middle cross member 1021; an edge rail 1022; a pressure relief vent 10221; a tank explosion-proof valve 103; a base plate 104;

an upper cover 2;

a battery module 3; a module body 301; a partition 302; a thinned portion 3021; a battery cell 303;

a pressure relief channel 4;

a heat sink 5; a first portion 501; the first connection hole 5011; a second portion 502; gas flow passage 5021; a third portion 503; second attachment holes 5031;

a first fastener 6;

and a second fastener 7.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

When electric core thermal runaway in the battery package, the inside heat that produces of battery package is far greater than the battery package to external heat dissipation capacity, will lead to the chemical substance in the electric core, if gasification formation flue gas such as electrode, mass flow body or electrolyte, when these high temperature flue gases can not in time discharge the battery package outside, the high temperature flue gas can be in the battery package irregularly spread, produces serious incident easily.

As shown in fig. 1 to 6, a battery pack 100 according to an embodiment of the present invention includes a case, a plurality of battery modules 3, and a plurality of pressure release channels 4. Battery module 3 and pressure release channel 4 all establish in the box, and every battery module 3 corresponds at least one pressure release channel 4 setting.

The arrangement of each battery module 3 corresponding to at least one pressure relief channel 4 can be understood as follows: one battery module 3 is arranged corresponding to one pressure relief channel 4; alternatively, one battery module 3 is provided corresponding to two or more pressure release channels 4.

The utility model discloses battery package 100, when battery module 3 takes place the thermal runaway, the flue gas that this battery module 3's electric core 303 produced can only flow along pressure release channel 4's extending direction (for example fore-and-aft direction), and the flue gas of avoiding battery module 3 to produce even from the leisurely reduction spreads other battery module departments.

It can be understood that the battery module 3 includes a plurality of battery cells 303, and each battery cell 303 may cause a thermal runaway problem. The thermal runaway occurring in the battery module 3 can be understood as that thermal runaway occurs in a part of the battery cells 303 in the battery module 3, or thermal runaway occurs in all the battery cells 303 in the battery module 3.

Therefore, in the battery pack 100 of the embodiment of the present invention, when the battery core 303 in the battery module 3 is out of control due to heat, the flue gas generated due to the heat out of control can only flow along the pressure relief channel 4, so that the flue gas can be prevented from irregularly spreading in the battery pack 100, on one hand, the flue gas can be prevented from spreading to other battery modules where no heat out of control occurs, and the safety of the battery module where no heat out of control occurs is improved, thereby being beneficial to improving the safety of the whole battery pack 100; on the other hand, under the condition of avoiding the flue gas from irregularly spreading in the battery pack 100, the using amount of protection materials in the battery pack can be reduced, the weight of the battery pack 100 is reduced, and the cost of the battery pack 100 is reduced.

Therefore, the battery pack 100 of the embodiment of the present invention has the advantages of good safety, light weight, low cost, etc.

In some embodiments, the box body comprises a lower box body 1 and an upper cover 2 arranged on the lower box body 1, the lower box body 1 comprises a plurality of longitudinal beams 101, the longitudinal beams 101 are arranged at intervals, and the battery module 3 is arranged between two adjacent longitudinal beams 101. The bottom surface of upper cover 2 and the top surface sealing fit of longeron 101, the top surface of battery module 3 and the bottom surface interval of upper cover 2 set up, form pressure release channel 4 between battery module 3, upper cover 2 and two adjacent longerons 101.

The utility model discloses battery package 100 utilizes the bottom surface of upper cover 2 and the sealed cooperation of top surface of longeron 101 for when being located the battery module 3 between two adjacent longerons 101 and taking place thermal runaway, longeron 101 can't be stridden to the flue gas that this battery module 3's electric core 303 produced, and stretch other battery module departments. And the smoke generated by the battery cells 303 of the battery module 3 can only flow along the extending direction (for example, the front-back direction) of the pressure relief channel 4.

By forming the pressure relief channel 4 between the battery module 3, the upper cover 2 and the two adjacent longitudinal beams 101, the pressure relief channel 4 can be formed by effectively utilizing the inherent structure inside the battery pack 100, thereby being beneficial to further reducing the weight of the battery pack 100 and the cost of the battery pack 100.

In order to make the technical solution of the present application easier to understand, the technical solution of the present application will be further described below by taking as an example that the arrangement direction of the box 1 and the upper cover 2 coincides with the vertical direction, the extending direction of the side member 101 coincides with the front-rear direction, and the arrangement direction of the side member 101 coincides with the left-right direction. Wherein the up-down direction, the front-back direction, and the left-right direction are as shown in fig. 1 to 3.

The lower box body 1 comprises a plurality of longitudinal beams 101 extending along the front-back direction, the longitudinal beams 101 are arranged at intervals along the left-right direction, the upper cover 2 is arranged on the upper side of the lower box body 1, and the lower surface (bottom surface) of the upper cover is in sealing fit with the upper surface (top surface) of the longitudinal beams 101. The battery module 3 is located between two adjacent longitudinal beams 101 in the left-right direction, and an upper surface (top surface) of the battery module 3 and a lower surface (bottom surface) of the upper cover 2 are provided at intervals in the up-down direction. A pressure relief passage 4 is formed between the upper surface of the battery module 3, the lower surface of the upper cover 2, the side member 101 located on the left side of the battery module 3, and the side member 101 located on the right side of the battery module 3. Wherein the pressure relief channel 4 extends in the front-rear direction.

The lower box body 1 further comprises a bottom plate 104, the plurality of longitudinal beams 101 are arranged on the upper side of the bottom plate 104, a containing cavity is formed between the bottom plate 104, the upper cover 2 and the two adjacent longitudinal beams 101, and the battery module 3 is arranged in the containing cavity.

Optionally, the longitudinal beams 101 are provided in more than three, and the battery module 3 is provided between any two adjacent longitudinal beams 101.

For example, as shown in fig. 2 and 3, four longitudinal members 101 are provided, and three battery modules 3 are provided. Two of the four longitudinal beams 101 are middle longitudinal beams 1011, the other two of the four longitudinal beams 101 are edge longitudinal beams 1012, the two middle longitudinal beams 1011 are arranged between the two edge longitudinal beams 1012, and the two middle longitudinal beams 1011 and the two edge longitudinal beams 1012 are alternately arranged at intervals in the left-right direction. Three containing cavities are formed among the bottom plate 104, the upper cover 2 and the four longitudinal beams 101, and the three battery modules 3 are respectively arranged in the three containing cavities in a one-to-one correspondence mode. Three pressure release channels 4 are formed among the three battery modules 3, the upper cover 2 and the four longitudinal beams 101, and the three battery modules 3 correspond to the three pressure release channels 4 one to one. The side members 1012 also serve as left and right frames of the lower box 1.

In some embodiments, the upper cover 2 is removably connected to the longitudinal beam 101.

For example, as shown in fig. 5, the upper cover 2 and the longitudinal beam 101 are detachably connected by the first fastener 6. Wherein the first fastening member 6 may be a bolt, a screw, or the like. Of course, in other embodiments, the upper cover 2 and the longitudinal beam 101 may be clamped by a snap.

The upper cover 2 is detachably connected with the longitudinal beam 101, so that on one hand, the lower box body 1 and the upper cover 2 can be conveniently assembled, and the battery pack 100 can be conveniently assembled; on the other hand, the maintenance and the change of the parts in the lower box body 1 are conveniently realized by disassembling the upper cover 2, thereby facilitating the maintenance and the overhaul of the battery pack 100.

Of course, in other embodiments, the upper cover and the longitudinal beam may be bonded.

In some embodiments, the battery module 3 includes a module body 301 and a separator 302 provided on the top of the module body 301. The top surface of the clapboard 302 is arranged at a distance from the bottom surface of the upper cover 2, the side surface of the clapboard 302 is matched with the side surface of the longitudinal beam 101 in a sealing way, a pressure relief channel 4 is formed between the clapboard 302, the upper cover 2 and two adjacent longitudinal beams 101, and the clapboard 302 is provided with a thinned part 3021.

Wherein, the portion of reducing thickness 3021 can break under first preset pressure, and module body 301 can include a plurality of electric cores 303 and support, and the upper portion of every electric core all is equipped with the explosion-proof valve of electric core, and the support is established on the upper portion of a plurality of electric cores 303, and baffle 302 is established on the upper portion of support. The upper surface of the bulkhead 302 and the lower surface of the upper cover 2 are provided at an interval in the vertical direction, the left side surface of the bulkhead 302 is in sealing engagement with the right side surface of the side member 101 located on the left side of the bulkhead 302, and the right side surface of the bulkhead 302 is in sealing engagement with the left side surface of the side member 101 located on the right side of the bulkhead 302. A pressure relief passage 4 is formed between the upper surface of the bulkhead 302, the lower surface of the upper cover 2, the right side surface of the side member 101 on the left side of the bulkhead 302, and the left side surface of the side member 101 on the right side of the bulkhead 302.

The utility model discloses when battery package 100, arbitrary electric core 303 in the battery module 3 take place the thermal runaway, this electric core 303's explosion-proof valve of electric core opens earlier, then when the pressure of the portion 3021 department of reducing of baffle 302 reached first preset pressure, the portion 3021 that reduces of baffle 302 broke for electric core 303 because of the flue gas that the thermal runaway produced, can get into pressure release channel 4 through the position of breaking of the portion 3021 that reduces.

Through set up baffle 302 between module body 301 and upper cover 2 for when electric core 303 leads to electric core explosion-proof valve to open because of taking place thermal runaway, electric core 303 can spray on baffle 302 earlier because of the flue gas that thermal runaway produced, and can not direct injection on upper cover 2. In brief, when the cell explosion-proof valve is opened first, the partition plate 302 plays a role in isolating the flue gas from the upper cover 2. It can be understood that when the thinned portion 3021 of the partition 302 is broken, the smoke will still impact the upper cover 2 at the moment when the smoke enters the pressure relief passage, but the impact force and the temperature of the smoke at this moment are not too high after spreading and diffusion. Therefore, the provision of the above-described separator 302 contributes to the improvement of the safety of the upper cover 2, thereby contributing to the improvement of the safety of the battery pack 100.

It is understood that the magnitude of the first preset pressure may be determined according to the heat and pressure resistance of the components inside the battery pack 100, and is not particularly limited herein.

Alternatively, the spacer 302 is bonded to the module body 301, and the spacer 302 is riveted to the module body 301.

For example, the lower surface of the spacer 302 is bonded to the upper surface of the bracket, and the spacer 302 is riveted to the bracket.

Of course, in other embodiments, the partition 302 and the module body 301 may be only bonded; or the partition 302 and the module body 301 may be riveted; alternatively, the partition 302 and the module body 301 may be connected by bolts, screws, or snaps.

Optionally, the separator plate 302 is a mica plate, a ceramic plate, or a mullite plate.

Mica plate, ceramic plate or mullite board have better high temperature resistance, and when the flue gas that electric core 303 produced because of thermal runaway sprays on baffle 302, can utilize baffle 302 to keep apart this flue gas and upper cover 2 more effectively, be favorable to further improving battery package 100's security.

Of course, in other embodiments, other separators with better high temperature resistance may be used for the separator 302.

Alternatively, the thickness of the spacer 302 is 0.8mm to 1.2mm, and the thickness of the thinned portion 3021 is 0.2mm to 0.4mm.

For example, the spacer 302 is a mica board, the thickness of the spacer 302 is 1mm, and the thickness of the thinned portion 3021 is 0.3mm.

Therefore, the strength of the partition plate 302 can be ensured under the condition that the partition plate 302 is not too thick; the thickness of the thinning part 3021 is set, so that the thinning part 3021 can be rapidly blasted after the battery cell 303 is out of control, and the energy of the smoke can be released in time.

In some embodiments, the thinned portion 3021 is elongated.

For example, as shown in fig. 2 and fig. 3, the battery cells 303 in each battery module 3 are arranged in two rows, two rows of the battery cells 303 are arranged in the left-right direction, and each battery cell 303 in the same row of the battery cells 303 is arranged in the front-back direction. Each partition plate 302 is provided with two thinned portions 3021, and each of the two thinned portions 3021 has a long bar shape extending in the front-rear direction. The two thinned portions 3021 correspond to the two rows of battery cells 303 one by one, and each thinned portion 3021 is provided on the upper portion of the corresponding row of battery cells 303.

By setting the thinned portion 3021 to be a long strip, the structure of the partition board 302 is simplified, and the design and processing of the partition board 302 are facilitated.

Optionally, the battery module 3 includes a plurality of battery cells 303, a battery cell explosion-proof valve is disposed on a top surface of the battery cell 303, and the thinning portion 3021 is disposed right above the battery cell explosion-proof valve.

For example, as shown in fig. 2 and 3, each of the thinning portions 3021 is provided directly above a corresponding row of the battery cells 303.

Therefore, when any one of the battery cells 303 in the battery module 3 is thermally runaway, after the cell explosion-proof valve of the battery cell 303 is opened, the flue gas generated by the thermal runaway of the battery cell 303 directly reaches the thinning part 3021 of the partition board 302, and the pressure at the thinning part 3021 of the partition board 302 easily reaches the first preset pressure and is broken. The flue gas that makes electric core 303 produce because of the thermal runaway can get into pressure release channel 4 fast, reduces the speed of stretching of flue gas in battery module 3 department, is favorable to further improving battery package 100's security.

In other embodiments, the thinning portion 3021 is provided in plurality, and the plurality of thinning portions 3021 are provided at intervals.

For example, two thinning portions 3021 are provided on each partition plate 302, and the two thinning portions 3021 are provided at intervals in the front-rear direction.

Through set up a plurality of portions of reducing 3021 on baffle 302 for electric core 303 can discharge battery package 100 outside fast because of the flue gas that the thermal runaway produced, reduces the speed of stretching of flue gas in battery module 3 department, is favorable to further improving battery package 100's security.

Alternatively, a plurality of thinning portions 3021 correspond to the plurality of battery cells 303 one by one, and each thinning portion 3021 is provided right above the cell explosion-proof valve of the corresponding battery cell 303.

For example, as shown in fig. 2 and fig. 3, the battery cells 303 in each battery module 3 are all provided in two rows, two rows of the battery cells 303 are arranged in the left-right direction, each battery cell 303 in the same battery cell 303 is arranged in the front-back direction, and each row includes ten battery cells 303. Two rows of the thinned portions 3021 are provided on each baffle 302, each row including ten thinned portions 3021. The two rows of thinned portions 3021 correspond to the two rows of battery cells 303 one to one, and each thinned portion 3021 is disposed directly above the battery cell explosion-proof valve of the corresponding battery cell 303.

Therefore, when thermal runaway occurs in any one of the battery cells 303 in the battery module 3, after the cell explosion-proof valve of the battery cell 303 is opened, the flue gas generated by the thermal runaway of the battery cell 303 directly reaches the thinned part 3021 of the partition plate 302, and the pressure at the thinned part 3021 of the partition plate 302 easily reaches the first preset pressure and is broken. Make electric core 303 because of the flue gas that the thermal runaway produced, can get into pressure release channel 4 fast, reduce the speed of stretching of flue gas in battery module 3 department, be favorable to further improving the security of battery package 100.

Of course, in other embodiments, only one of the thinned portions 3021 of the partition 302 may be provided.

In some embodiments, the lower box body 1 comprises a plurality of beams 102 and a box body explosion-proof valve 103, the plurality of beams 102 are arranged at intervals, and the box body explosion-proof valve 103 is arranged on the lower box body 1.

Wherein, the tank explosion-proof valve 103 can be opened under a second preset pressure.

It is understood that the magnitude of the second preset pressure may be determined according to the heat and pressure resistance of the components inside the battery pack 100, and is not particularly limited herein.

Flue gas generated by the battery core 303 of the battery module 3 flows along the extending direction of the pressure relief channel 4, finally reaches the explosion-proof valve 103, and when the pressure of the flue gas reaches a second preset pressure, the explosion-proof valve 103 of the box body is opened, so that the flue gas can be discharged out of the battery pack 100.

Optionally, one part of the plurality of cross beams 102 is a middle cross beam 1021, another part of the plurality of cross beams 102 is a side cross beam 1022, the middle cross beam 1021 is disposed between two adjacent side cross beams 1022, and the plurality of longitudinal beams 101 is disposed between two adjacent side cross beams 1022. At least one of the rim beams 1022 has a pressure relief hole 10221, and the tank explosion-proof valve 103 is provided on the pressure relief hole 10221. The battery pack 100 further includes a heat sink 5, the heat sink 5 is disposed in the lower case 1, the heat sink 5 covers the pressure release hole 10221, and the heat sink 5 has a plurality of air flow holes 5021 through which air flows.

For example, as shown in fig. 2 and 3, the lower case 1 includes four beams 102 extending in the left-right direction, the four beams 102 are each provided on the upper side of the bottom plate 104, and the four beams 102 are provided at intervals in the front-rear direction. Two of the four cross beams 102 are middle cross beams 1021, the other two of the four cross beams 102 are edge cross beams 1022, the two middle cross beams 1021 are arranged between the two edge cross beams 1022, and the two middle cross beams 1021 and the two edge cross beams 1022 are alternately arranged at intervals along the front-rear direction. Four longerons 101 are located between two middle part crossbeams 1021 in the front and back orientation, and the one end of four longerons 101 all links to each other with one of them middle part crossbeam 1021, and the other end of four longerons 101 all links to each other with another middle part crossbeam 1021. Three accommodating cavities are formed among the bottom plate 104, the upper cover 2, the four longitudinal beams 101 and the two middle cross beams 1021.

As shown in fig. 4, the upper surfaces of the two middle cross members 1021 and the lower surface of the upper cover 2 are spaced in the up-down direction, so that the pressure relief passage 4 communicates with the pressure relief hole 10221. The edge beams 1022 also serve as the front and rear frames of the lower case 1. A pressure relief hole 10221 is formed in the edge beam 1022 located at the front side, and the tank explosion-proof valve 103 is provided on the pressure relief hole 10221. The heat sink 5 is provided between the front side edge beam 1022 and the front side middle beam 1021, the heat sink 5 corresponds to the pressure release hole 10221 in the front-rear direction, and the heat sink 5 has a plurality of air flow through holes 5021 penetrating in the front-rear direction.

From this, before the flue gas in pressure release channel 4 flows out through box explosion-proof valve 103, the flue gas can flow through fin 5 to utilize fin 5 to cool off the flue gas, make the flue gas through this fin 5 loss more heat, the temperature of flue gas is lower (for example within 50 ℃) when reacing box explosion-proof valve 103 like this, all has fine guard action to box explosion-proof valve 103 and outside people or thing, is favorable to further improving battery package 100's security.

Optionally, the tank explosion-proof valve 103 is a metal elastic explosion-proof valve.

Of course, in other embodiments, a cooling fin 5 may be disposed in the pressure relief channel 4 to cool the flue gas in the pressure relief channel 4.

Optionally, the heat sink 5 includes a first portion 501, a second portion 502, and a third portion 503 connected in sequence, the first portion 501 and the third portion 503 are connected to the cross beam 102, and the second portion 502 is spaced apart from the cross beam 102.

For example, as shown in fig. 6, the projection of the heat sink 5 on the plane perpendicular to the up-down direction is U-shaped, or the cross section of the heat sink 5 perpendicular to the up-down direction is U-shaped. The first portion 501 and the third portion 503 are connected to the edge beam 1022 located on the front side, and the second portion 502 is disposed at a distance from the edge beam 1022 located on the front side in the front-rear direction.

Therefore, on one hand, the structure of the radiating fin 5 is beneficial to increasing the radiating area of the radiating fin 5 and improving the radiating efficiency of the radiating fin 5; on the other hand, when the heat sink 5 is mounted, the second portion 502 of the heat sink 5 can be held by hand, so that the heat sink 5 is conveniently mounted, which is beneficial to improving the assembly efficiency of the battery pack 100.

Of course, in other embodiments, the heat sink 5 may also be a flat plate, a heat sink fin, or other shapes that facilitate heat dissipation.

Optionally, the fins 5 are steel plates. Therefore, the heat dissipation fins 5 have a high heat conductivity coefficient, which is beneficial to improving the heat dissipation efficiency of the heat dissipation fins 5.

Alternatively, the heat sink 5 may be detachably coupled to the lower case 1.

For example, as shown in fig. 6, the first portion 501 has a first connection hole 5011, the third portion 503 has a second connection hole 5031, and the edge beam 1022 located at the front side has a first mounting hole corresponding to the first connection hole 5011 and a second mounting hole corresponding to the second connection hole 5031. The heat sink 5 and the rim beam 1022 on the front side are connected by the second fastening member 7 passing through the first connecting hole 5011 and connected to the first mounting hole, and the second fastening member 7 passing through the second connecting hole 5031 and connected to the second mounting hole.

The radiating fins 5 are detachably connected with the lower box body 1, and the radiating fins 5 are convenient to install and replace.

Optionally, battery module 3 includes the liquid cooling board, and the liquid cooling board is established in the side of electric core 303.

For example, the plurality of battery cells 303 are bonded to the liquid cooling plate by a heat conductive adhesive to form a whole, the bottom of the whole is bonded to the bottom plate 104 of the lower case 1 by a heat conductive adhesive, and the partition plate 302 is fixed to the top of the whole by plastic rivets and a double-sided adhesive.

Of course, in other embodiments, the heat sink 5 and the beam 102 may be a single structure.

In the battery pack 100 of the embodiment of the present invention, after the battery cell 303 of one of the battery modules 3 is out of thermal control, the battery cell explosion-proof valve of the battery cell 303 is opened first, so that the flue gas generated by the battery cell 303 due to the thermal control flows out of the battery cell 303; then, the smoke flowing out of the battery cell 303 explodes the thinned part 3021 of the partition plate 302 facing the battery cell explosion-proof valve, and then the smoke generated by the battery cell 303 due to thermal runaway flows to the position of the case explosion-proof valve 103 along the pressure relief channel 4 formed by the partition plate 302, the upper cover 2 and the longitudinal beam 101, and finally flows out of the battery pack 100 through the case explosion-proof valve 103. Smoke generated by the battery cell 303 due to thermal runaway cannot reach other positions of the battery pack 100 due to the sealing fit between the upper cover 2 and the longitudinal beam 101.

In the battery pack 100 of the embodiment of the present invention, the partition plate 302, the upper cover 102 and the two adjacent longitudinal beams 101 form the restricted pressure relief channel 4, so that the use of thermal protection materials can be reduced, and the effects of reducing weight and reducing cost can be achieved; the battery cores of other battery modules can be prevented from being damaged due to the restricted pressure relief channel 4; by providing the heat sink 5 at the case explosion-proof valve 103, the temperature of the smoke discharged from the battery pack 100 can be lowered, and a person or an object outside the battery pack 100, for example, a passenger compartment of a vehicle using the battery pack 100, can be effectively protected.

The vehicle of the embodiment of the utility model comprises the battery pack of any one of the above embodiments.

Therefore, the utility model discloses the vehicle has that the security is good and advantage such as journey mileage is long.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the present disclosure, the terms "one embodiment," "some embodiments," "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 present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to 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. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that various changes, modifications, substitutions and alterations to the above embodiments by those of ordinary skill in the art are intended to be within the scope of the present invention.

Claims (10)

1. A battery pack, comprising:

a box body; and

the battery module with the pressure release channel is all established in the box, every the battery module corresponds at least one the pressure release channel sets up.

2. The battery pack according to claim 1, wherein the box body comprises a lower box body and an upper cover arranged on the lower box body, the lower box body comprises a plurality of longitudinal beams, the longitudinal beams are arranged at intervals, the battery module is arranged between two adjacent longitudinal beams, the bottom surface of the upper cover is in sealing fit with the top surfaces of the longitudinal beams, the top surfaces of the battery module and the bottom surface of the upper cover are arranged at intervals, and the pressure relief channel is formed among the battery module, the upper cover and two adjacent longitudinal beams.

3. The battery pack according to claim 2, wherein the battery module comprises a module body and a partition plate arranged at the top of the module body, the top surface of the partition plate is arranged at a distance from the bottom surface of the upper cover, the side surface of the partition plate is in sealing fit with the side surface of the longitudinal beam, the pressure relief channel is formed between the partition plate, the upper cover and two adjacent longitudinal beams, and the partition plate is provided with a thinned part.

4. The battery pack according to claim 3, wherein the thinned portion has a long bar shape; or

The thinning portion is provided with a plurality of, and a plurality of thinning portions are arranged at intervals.

5. The battery pack according to claim 4, wherein the battery module comprises a plurality of battery cells, a battery cell explosion-proof valve is arranged at the top of each battery cell, and the thinning part is arranged right above the battery cell explosion-proof valve.

6. The battery pack according to any one of claims 2 to 5, wherein the lower case includes a plurality of edge beams and a case explosion-proof valve, the plurality of longitudinal beams are disposed between two adjacent edge beams, the plurality of edge beams are disposed at intervals, at least one of the edge beams has a pressure relief hole, the case explosion-proof valve is disposed on the pressure relief hole, each battery module is communicated with the case explosion-proof valve through the corresponding pressure relief passage, the battery pack further includes a heat sink, the heat sink is disposed in the lower case, the heat sink is covered on the pressure relief hole, and the heat sink has a plurality of air flow holes.

7. The battery pack of claim 6, wherein the heat sink includes a first portion, a second portion, and a third portion connected in series, the first portion and the third portion being connected to the rim beam, the second portion being spaced apart from the rim beam.

8. The battery pack according to claim 6, wherein the lower case further comprises a plurality of middle cross beams, the plurality of middle cross beams are arranged between two adjacent edge cross beams, the plurality of middle cross beams are arranged at intervals, two ends of each longitudinal beam are respectively connected with two adjacent middle cross beams, and the bottom surface of the upper cover is arranged at intervals with the top surfaces of the middle cross beams.

9. The battery pack according to any one of claims 3 to 5, wherein the separator has a thickness of 0.8mm to 1.2mm, and the thinned portion has a thickness of 0.2mm to 0.4mm.

10. A vehicle characterized by comprising the battery pack according to any one of claims 1 to 9.

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