CN115117529A

CN115117529A - Battery pack

Info

Publication number: CN115117529A
Application number: CN202110296419.6A
Authority: CN
Inventors: 廖正远; 曾毅
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2021-03-19
Filing date: 2021-03-19
Publication date: 2022-09-27

Abstract

The application provides a battery package, this battery package includes battery module, liquid cooling board, sealed lid and exhaust passage. Wherein, the liquid cooling plate and the sealing cover form a sealing cavity. When thermal runaway appeared in battery unit, the explosion-proof valve of battery unit is opened, high-temperature gas can get into exhaust passage through exhaust passage's inlet port, and the venthole through exhaust passage and the air inlet entering sealed chamber in sealed chamber, and this moment because the existence of liquid cold drawing, the liquid cold drawing can cool off high-temperature gas, and then get rid of high-temperature gas's high temperature attribute, avoid high-temperature gas to induce adjacent battery unit thermal runaway to appear, avoid causing the secondary damage to battery pack inside battery unit and relevant functional part and structure, improve the security of battery pack, reduce the cost of maintenance of battery pack.

Description

Battery pack

Technical Field

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

Background

The power battery pack is used as an energy storage device and is a core component of hybrid electric vehicles and electric vehicles. In order to prevent explosion accidents, the battery cell is usually provided with an explosion-proof valve structure. In the use process of the battery, if the internal air pressure is increased to a certain degree, the explosion-proof valve is opened, and flame, smoke or high-temperature gas in the battery monomer is discharged through the explosion-proof valve.

In prior art, after the explosion-proof valve on the battery monomer is opened, discharged flame, smog or high-temperature gas can be accumulated inside the battery pack, and if the gas can not be discharged in time, secondary damage or other batteries are easily caused to the battery. Therefore, when the battery core is out of thermal runaway, the exhaust channel is generally arranged, and high-temperature gas or high-temperature smoke exhausted by the battery monomer is exhausted out of the battery pack through the exhaust channel. However, since the temperature of the high-temperature gas is too high, the whole battery pack and the battery cells in the battery pack are still damaged secondarily in the process of discharging the high-temperature gas out of the battery pack, and structural members outside the battery pack are also damaged after the high-temperature gas is discharged out of the battery pack, so that the danger of the battery pack is increased.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the battery pack is provided aiming at the problem that secondary damage is easily caused to a battery cell and a structural member in the battery pack by high-temperature gas which is sprayed out after thermal runaway of the existing battery pack in the process of discharging the battery pack.

In order to solve the above technical problem, the present invention provides a battery pack, including:

the battery module is provided with a plurality of battery units, and each battery unit comprises an explosion-proof valve;

the liquid cooling plate is arranged on the battery module;

the sealing cover is matched with the liquid cooling plate to form a sealing cavity, and the sealing cavity is provided with an air inlet;

the exhaust channel is provided with an air inlet hole, the air inlet hole is matched with the explosion-proof valve, the exhaust channel is also provided with an air outlet hole, and the air outlet hole is communicated with the air inlet;

when the explosion-proof valve is opened, the exhaust channel is used for guiding fluid to enter the exhaust channel from the air inlet and flow into the sealing cavity from the air outlet and the air inlet.

In an embodiment of the application, the sealing cover is provided with a sealing protrusion, the sealing protrusion encloses to form an area, and the liquid cooling plate is arranged on the sealing protrusion to form the sealing cavity.

In this application embodiment, one side of battery module is equipped with the curb plate, the curb plate is close to one side in sealed chamber is equipped with keeps away from the protruding structure of battery module, the opposite side contact the battery module, the protruding structure forms exhaust passage, the explosion-proof valve of battery unit is located curb plate protruding structure is interior.

In this application embodiment, the battery module has two row at least battery unit, and adjacent two rows the centre of battery unit is equipped with the centre sill, form in the centre sill the exhaust passage, the explosion-proof valve orientation of battery unit the centre sill sets up, the centre sill with the position of the explosion-proof valve contact of battery unit is equipped with the inlet port, the centre sill with one side of liquid cold plate contact is equipped with the venthole.

In an embodiment of the present application, the plurality of air inlet holes disposed on both sides of the middle beam are alternately disposed at intervals.

In an embodiment of the present application, a support structure is disposed on the sealing cover, and the support structure is used for supporting the liquid cooling plate.

In an embodiment of the present application, the side plate is fixedly connected to the sealing protrusion to form a matching communication between the air outlet hole and the air inlet.

In this application embodiment, be equipped with the air inlet on the liquid cooling board, the air inlet runs through the liquid cooling board, the venthole that is equipped with on the centre sill with air inlet cooperation intercommunication on the liquid cooling board.

In an embodiment of the present application, the sealing cover is a battery pack cover or a battery pack tray.

In an embodiment of the present application, the seal chamber is further provided with an air outlet, and a battery pack explosion-proof valve is arranged in the air outlet.

The beneficial effects of the invention are as follows: the application provides a battery package, this battery package includes battery module, liquid cooling board, sealed lid and exhaust passage. Wherein, the liquid cooling plate and the sealing cover form a sealing cavity. When thermal runaway appeared in battery unit, the explosion-proof valve of battery unit is opened, high-temperature gas can get into exhaust passage through exhaust passage's inlet port, and the venthole through exhaust passage and the air inlet entering sealed chamber in sealed chamber, and this moment because the existence of liquid cold drawing, the liquid cold drawing can cool off high-temperature gas, and then get rid of high-temperature gas's high temperature attribute, avoid high-temperature gas to induce adjacent battery unit thermal runaway to appear, avoid causing the secondary damage to battery pack inside battery unit and relevant functional part and structure, improve the security of battery pack, reduce the cost of maintenance of battery pack.

Drawings

Fig. 1 is an exploded view of a battery pack provided according to an embodiment of the present application.

Fig. 2 is a schematic structural view illustrating a battery module and a sealing cover according to an embodiment of the present disclosure.

Fig. 3 is an exploded view illustrating a structure in which a battery module is coupled with a sealing cover according to an embodiment of the present invention.

FIG. 4 is a schematic cross-sectional view taken at A1-A2 of FIG. 2.

Fig. 5 is an enlarged view at B in fig. 4.

Fig. 6 is an enlarged view at C in fig. 4.

Fig. 7 is an exploded view illustrating the structure of a battery module according to an embodiment of the present invention.

Fig. 8 is a schematic view illustrating a side plate of a battery module according to an embodiment of the present invention.

Fig. 9 is a schematic view illustrating a center sill of a battery module according to an embodiment of the present invention.

The reference numerals in the specification are as follows:

10. a battery pack;

100. a battery module; 110. a battery cell; 120. an explosion-proof valve; 130. a side plate; 131. a protruding structure; 132. a first opening; 133. a second opening; 140. a center sill; 150. a top plate; 160. an end plate; 170. a plastic bracket; 180. a protective cover; 190. connecting the pole column with a connecting sheet;

200. an exhaust passage; 210. an air inlet; 220. an air outlet;

300. a sealing cover; 310. covering the battery pack; 320. a battery pack tray; 330. sealing the protrusion; 340. sealing the cavity; 341. an air inlet; 342. an air outlet; 350. a battery pack explosion-proof valve; 360. a third opening; 370. clamping the groove;

400. a liquid cooling plate; 410. a liquid inlet interface; 420. and a liquid outlet interface.

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 or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the embodiments of the present application, please refer to the attached drawings, and for convenience of description, the width direction of the battery module is defined as the X direction in the attached drawings; defining the length direction of the battery module as the Y direction in the drawing; the height direction of the battery module is defined as the Z direction in the drawings.

Referring to fig. 1 to 9, the present application provides a battery pack 10, wherein the battery pack 10 includes a battery module 100, a liquid cooling plate 400, a sealing cover 300, and an air vent 200.

In an embodiment of the present application, the battery pack 10 may be a power battery pack 10 of an electric vehicle or a hybrid vehicle.

In an embodiment of the present application, the battery pack 10 includes a battery module 100, and the battery module 100 may be disposed in a case of the battery pack 10. The battery pack 10 case may be used to house the battery module 100. The battery module 100 has a plurality of battery cells 110, and each battery cell 110 includes an explosion-proof valve 120. Battery unit 110 generally refers to a battery cell or a cell. The explosion-proof valve 120 is provided on the battery cell 110 and can be opened when the pressure inside the battery cell 110 reaches a certain value, so that the gas inside the battery cell 110 is discharged. Specifically, after thermal runaway of the battery cell 110 occurs, the electrolyte rapidly generates gas to cause the internal pressure of the battery cell 110 to be too high, and further the explosion-proof valve 120 is opened.

In an embodiment of the present application, the battery pack 10 further includes a liquid cooling plate 400, and the liquid cooling plate 400 is generally used to cool the battery module 100 or the battery unit 110, so as to ensure the safety of the battery module 100 or the battery unit 110. Generally, the liquid cooling plate 400 is provided on the battery module 100. The above-described liquid cooling plate 400 is provided on the battery module 100 means that the liquid cooling plate 400 may be placed on both sides in the height direction of the battery module 100 therealong, in other words, the top and bottom in a general use state of the battery module 100.

In an embodiment of the present application, the battery pack 10 further includes a sealing cover 300, the sealing cover 300 is used for cooperating with the liquid cooling plate 400 to form a sealed cavity 340, and the sealed cavity 340 is a space for temporarily storing a fluid. The sealed chamber 340 has an inlet 341 to ensure that gas enters the sealed chamber 340 and is primarily stored in the sealed chamber 340. In addition, the sealing cover 300 may serve as a case of the battery pack 10 for accommodating the battery module 100, such as the battery pack upper cover 310 or the battery pack tray 320. The sealing cover 300 may also be a separately provided sealing structure for forming the sealing chamber 340 in cooperation with the liquid cooling plate 400.

In one embodiment of the present application, the battery pack 10 further includes an exhaust passage 200, and the exhaust passage 200 is used for guiding the gas to flow through. Specifically, the exhaust passage 200 is provided with an air inlet hole 210, and the air inlet hole 210 is matched with the explosion-proof valve 120; the exhaust passage 200 is further provided with an air outlet hole 220, and the air outlet hole 220 communicates with an air inlet 341 of the seal chamber 340. The exhaust passage 200 is used for guiding the fluid to enter the exhaust passage 200 from the air inlet hole 210 after the explosion-proof valve 120 is opened, and to flow into the sealing cavity 340 from the air outlet hole 220 and the air inlet 341. The fluid may be a high temperature gas or an electrolyte, etc.

In this embodiment, after the thermal runaway of the battery unit 110 can be ensured by the above structural design, the high-temperature gas generated by the battery unit 110 can enter the exhaust channel 200 through the air inlet 210 of the exhaust channel 200, and enter the sealed cavity 340 through the air outlet 220 of the exhaust channel 200 and the air inlet 341 of the sealed cavity 340, and at this time, due to the existence of the liquid-cooled plate 400, the liquid-cooled plate 400 can cool the high-temperature gas, so as to remove the high-temperature property of the high-temperature gas, and temporarily store the cooled high-temperature gas in the sealed cavity 340. Since the high-temperature gas discharged from the battery cell 110 does not have a high-temperature property after being cooled by the liquid cooling plate 400 on the sealing chamber 340, the high-temperature gas does not cause secondary damage to the battery cell 110 or other structural members in the battery pack 10 even if stored in the battery pack 10, thereby improving the safety of the battery pack 10 and reducing the replacement cost of the battery pack 10. Moreover, even when the high-temperature gas is exhausted out of the battery pack 10 through the sealing cavity 340, the liquid cooling plate 400 cools the high-temperature gas, so that the gas exhausted from the battery pack 10 cannot damage the structure outside the battery pack 10, and the use risk of the battery pack 10 is reduced.

The following description will discuss a specific structure of the battery pack 10 with reference to the specific embodiment and fig. 1 to 9.

In an embodiment of the present invention, the battery module 100 includes a plurality of battery cells 110. The plurality of battery cells 110 are arranged in the length direction of the battery module 100, and the poles to which the battery cells 110 are provided and the explosion-proof valve 120 are provided at one side of the battery cells 110 in the width direction of the battery module 100.

Further, in one embodiment of the present invention, the battery module 100 includes side plates 130, a top plate 150, an end plate 160, and a bottom plate. Two side plates 130 are provided and are respectively disposed on both sides of the battery module 100 in the width direction thereof; the top plate 150 and the bottom plate are respectively oppositely disposed at one side of the battery module 100 in the height direction; the end plates 160 are provided in two and are respectively disposed at both sides of the battery module 100 in the length direction thereof. It is understood that the top plate 150, the side plates 130, the end plates 160, and the bottom plate are provided mainly to fasten the plurality of battery cells 110, so that the plurality of battery cells 110 form the battery module 100. The top plate 150, the side plates 130, the end plates 160, and the bottom plate are not necessarily provided for the battery module 100, and any one or more of the above-described structures may be absent as long as the fastening of the plurality of battery cells 110 is satisfied. In the embodiment of the present application, as shown in fig. 7, the battery module 100 in the embodiment of the present application only includes the side plates 130, the bottom plate, and the end plate 160, and the main purpose of omitting the top plate 150 is that the liquid cooling plate 400 provided in the battery pack 10 in the present application can be used as the bottom plate of the battery module 100 to fix the battery unit 110. Further, the side plates 130 and the end plates 160 of the battery module 100 are fixed to the bottom plate and the liquid cooling plate 400 to form a fastening to the plurality of battery cells 110. In other embodiments of the present disclosure, the bottom plate of the battery module 100 may be omitted, and the liquid cooling plate 400 is disposed between the battery module 100 and the battery tray, so that the liquid cooling plate 400 is used as the bottom plate of the battery module 100 for bonding and fixing.

In addition, in an embodiment of the present application, as shown in fig. 7, the battery module 100 further includes a plastic bracket 170 disposed on one side of the side plate 130, a protective cover 180, and a terminal connecting piece 190. The plastic support 170 is used for being arranged on the side plate 130 of the battery pack 10 to expose the pole, so that the pole connecting sheet 190 can be conveniently welded. The post connecting piece 190 is used for connecting the positive and negative posts, thereby forming a current path. The protective cover 180 covers the post connector to protect the post and the post connecting piece 190. It can be understood that, since the terminal of the battery cell 110 is disposed along the width direction of the battery module 100 in the present application, the plastic bracket 170, the protective cover 180 and the terminal connecting piece 190 are disposed on one side of the side plate 130 of the battery module 100. In other embodiments, the above structure may be changed as the position where the terminal post is disposed is changed, and the above structure may be omitted for the battery module 100, which will not be described in detail.

In an embodiment of the present application, as shown in fig. 1 to 3, a liquid cooling plate 400 is provided on the battery module 100, and specifically, the liquid cooling plate 400 is provided at one side of the battery module 100 in the height direction thereof, and the battery module 100 supports the liquid cooling plate 400. In this case, the liquid cooling plate 400 may be used as the top plate 150 of the battery module 100 to fasten the battery cells 110 in the battery module 100 together with the end plate 160, the side plate 130, and the bottom plate, or in other embodiments, the liquid cooling plate 400 may be used as the bottom plate of the battery module 100 to fasten the battery cells 110 in the battery module 100 together with the end plate 160, the side plate 130, and the top plate 150. And the liquid-cooling plate 400 and the base plate may be fixed to the battery cell 110 by means of gluing.

In one embodiment of the present application, as shown in fig. 1 to 3, the sealing cover 300 is disposed on the battery module 100 as the upper cover 310 of the battery pack, and forms a box body of the battery pack 10 together with the tray 320 of the battery pack to accommodate the battery module 100 and related structural members, and the liquid cooling plate 400 is disposed between the battery module 100 and the upper cover 310 (the sealing cover 300) of the battery pack. In other embodiments of the present application, the sealing cover 300 may also serve as a tray 320 for the battery pack and form a box of the battery pack 10 together with the upper cover 310 for accommodating the battery module 100 and the phase-change device. At this time, the liquid cooling plate 400 is disposed between the battery module 100 and the battery tray (the sealing cover 300). In other embodiments of the present application, the sealing cover 300 may also be used as a separate structural member to cooperate with the liquid cooling plate 400 to form the sealing chamber 340, so as to achieve the effects of storing and cooling the gas.

Still further, the sealing cover 300 is provided with a sealing protrusion 330, and the sealing protrusion 330 protrudes toward the battery module 100 and encloses a region. The area of this region is smaller than that of the sealing cap 300, and the purpose thereof is to ensure that other structural members and functional members, for example, a BMS, a high voltage distribution box, etc., can be prepared in the entire inner space of the battery pack 10. The liquid cooling plate 400 is disposed on the sealing protrusion 330 to cover an area enclosed by the sealing protrusion 330, thereby forming the sealing chamber 340.

Still further, in order to ensure that the liquid cooling plate 400 can be stably disposed on the sealing protrusion 330 of the sealing cover 300, the sealing cover 300 may further be provided with a supporting structure (not shown) having one end disposed on the sealing cover 300 and the other end contacting the liquid cooling plate 400. The support structure is used to support the liquid-cooled panel 400. Specifically, the support structure is provided in an area surrounded by the sealing protrusion 330, and the support structure may be provided in plurality. In addition, the position of the support structure disposed in the region enclosed by the sealing protrusion 330 is not fixed, and may be selected according to actual requirements, which is not limited. It is understood that the sealing cover 300 is provided with the support structure only to ensure that the liquid cooling plate 400 is stably disposed on the sealing protrusion 330, and therefore, the sealing cover 300 may not be provided with the support structure for the battery pack 10 in other embodiments.

In particular, the provision of the support structure for the sealing cover 300 may also accelerate the cooling effect of the high-temperature gas. Specifically, when having bearing structure in sealed chamber 340, high-temperature gas can shunt through bearing structure after getting into sealed chamber 340 from sealed chamber 340 air inlet 341, and then reaches and improves high-temperature gas cooling effect.

In addition, in an embodiment of the present application, as shown in fig. 3, the liquid cooling plate 400 further has an inlet port 410 and an outlet port 420. Because the liquid inlet interface 410 and the liquid outlet interface 420 arranged on the liquid cooling plate 400 often protrude out of the plane where the liquid cooling plate 400 is located, for the stability and the safety of fixing the liquid cooling plate 400, the sealing protrusion 330 is provided with a clamping groove 370, and the clamping groove 370 is matched with the liquid inlet interface 410 and the liquid outlet interface 420 of the liquid cooling plate 400 to lead the liquid inlet interface 410 and the liquid outlet interface 420 out of the sealing cavity 340. The battery pack 10 is also provided with a liquid inlet joint and a liquid outlet joint which are communicated with external liquid supply equipment. The positions of the liquid inlet joint and the liquid outlet joint in the battery pack 10 are not limited, the liquid inlet joint is communicated with the liquid inlet interface 410 through a conduit, and the liquid outlet joint is connected with the liquid outlet interface 420 through a conduit, so that the cooling liquid can conveniently enter the liquid cooling plate 400.

The following description is made with respect to the exhaust passage 200 in the present application:

in an embodiment of the present application, as shown in fig. 4, 5 and 8, the battery module 100 is provided with side plates 130 along both sides in the width direction thereof, one side of the side plate 130 close to the sealing cavity 340 is provided with a protruding structure 131 far away from the battery module 100, and the other side contacts the battery module 100. The projection structure 131 forms the exhaust passage 200, and the explosion-proof valve 120 of the battery cell 110 is located inside the projection structure 131 of the side plate 130.

Further, the battery module 100 is provided with side plates 130 on both sides in the width direction thereof, and the side plates 130 may serve as exhaust passages 200 for guiding high-temperature gas discharged from the battery cells 110 into the sealed chamber 340. Specifically, after the side plate 130 is fixed to the battery module 100, a cavity is formed between the protruding structure 131 of the side plate 130 and the battery cells 110 of the battery module 100, and the cavity can serve as the exhaust channel 200 for guiding high-temperature gas exhausted from the battery cells 110. And the protruding structure 131 of the side plate 130 forms a cavity, and a first opening 132 is provided at a side facing the battery unit 110 and a second opening 133 is provided at a position facing the sealing chamber 340, and the explosion-proof valve 120 of the battery unit 110 can enter the protruding structure 131 through the first opening 132 to form a cavity. The first opening 132 of the cavity facing the battery cell 110 is an air inlet hole 210 of the air discharge passage 200, and the second opening 133 of the cavity facing the sealed chamber 340 is an air outlet hole 220 of the air discharge passage 200.

It can be understood that, when the high temperature gas enters the exhaust passage 200 formed by the side plate 130, since the protruding structure 131 of the side plate 130 is provided with the exhaust hole only at the position where it contacts the sealed chamber 340, the high temperature gas can enter the sealed chamber 340 only through the preset guiding route, that is, through the exhaust hole of the exhaust passage 200 into the inlet 341 of the sealed chamber 340 and then into the sealed chamber 340.

Still further, the cavities formed by the protruding structures 131 of the side plates 130 may be communicated in the length direction, and then the protruding structures 131 of the side plates 130 form a communicated exhaust channel 200, thereby improving the circulation efficiency of the high-temperature gas exhausted by the battery unit 110 entering the sealed cavity 340 from the exhaust channel 200. In other embodiments of the present application, the side plate 130 may further be provided with a spacing structure, and a cavity is formed between two adjacent spacing structures, so as to form the exhaust channel 200. Each of the spaced structures defines a cavity corresponding to the explosion-proof valve 120 of one of the battery cells 110. The arrangement of the partition structure of the side plates 130 may prevent the influence between the adjacent two battery cells 110, and reduce the risk of inducing thermal runaway of the adjacent battery cells 110.

Still further, in the present embodiment, the side plate 130 is fixedly connected to the sealing protrusion 330 to form a matching communication between the air outlet 220 and the air inlet 341. Specifically, after the liquid cooling plate 400 is fixed to the sealing protrusion 330, a third opening 360 is formed between the liquid cooling plate 400 and the sealing protrusion 330, and the third opening 360 can serve as the air inlet 341 of the sealing cavity 340, so that when the protruding structure 131 of the side plate 130 of the battery module 100 is fixedly connected to the sealing protrusion 330, the third opening 360 is in fit communication with the second opening 133, and thus the air outlet 220 is in fit communication with the air inlet 341. In other words, after the liquid cooling plate 400 is fixed to the sealing protrusion 330, the area of the liquid cooling plate 400 is smaller than the area of the region surrounded by the sealing protrusion 330, i.e. the liquid cooling plate 400 does not completely enclose the region surrounded by the sealing protrusion 330. After the sealing protrusion 330 is communicated with the exhaust passage 200 of the side plate 130, the sealing performance formed by the liquid cooling plate 400 and the sealing cover 300 is sealed.

In the above embodiment, after thermal runaway of the battery cell 110 occurs, the explosion-proof valve 120 is opened, and high-temperature gas enters the exhaust channel 200 formed by the side plate 130 through the gas inlet hole 210 (i.e., the first opening 132) of the exhaust channel 200, and enters the sealed cavity 340 through the gas outlet hole 220 (i.e., the second opening 133) of the exhaust channel 200 and the gas inlet 341 (i.e., the third opening 360) of the sealed cavity 340, so as to contact the liquid-cooled plate 400.

In the above embodiment, the anti-explosion valve 120 of the battery unit 110 is generally disposed toward the exhaust channel 200 disposed on the side plate 130, and is aimed at effectively guiding the exhaust of high-temperature gas for the battery unit with thermal runaway, so as to prevent the high-temperature gas from affecting the adjacent battery units and reduce the risk of thermal runaway of the battery pack in cascade.

Generally, the side plate 130 is selected from SMC material to ensure insulation, corrosion resistance and thermal stability of the side plate 130.

In another embodiment of the present application, as shown in fig. 4, 6 and 9, the battery module 100 has at least two rows of battery cells 110, and a middle beam 140 is disposed between two adjacent rows of battery cells 110. The center beam 140 serves to separate the two rows of battery cells 110 so as not to allow the two rows of battery cells 110 to interfere with each other. The two rows of battery cells 110 refer to two groups of battery cells 110 arranged along the width direction of the battery module 100, and each group of battery cells 110 has a plurality of battery cells 110 arranged along the length direction of the battery module 100.

Further, the center sill 140 is internally formed with an exhaust passage 200. The explosion-proof valve 120 of the battery unit 110 is arranged towards the middle beam 140, an air inlet hole 210 is arranged at the position where the middle beam 140 contacts the explosion-proof valve 120 of the battery unit 110, and an air outlet hole 220 is arranged at one side where the middle beam 140 contacts the liquid-cooled plate 400. When thermal runaway of the battery cell 110 occurs, high-temperature gas discharged from the battery cell 110 may enter the gas discharge channel 200 inside the middle beam 140 through the gas inlet hole 210 of the middle beam 140 and enter the sealing chamber 340 through the gas outlet hole 220 of the middle beam 140.

Still further, the liquid cooling plate 400 is provided with an air inlet 341, and the air inlet 341 penetrates through the liquid cooling plate 400. The air outlet 220 formed on the middle beam 140 is matched and communicated with the air inlet 341 of the liquid cooling plate 400. Specifically, a sealed chamber 340 is formed between the liquid cooling plate 400 and the sealing cover 300, and an air inlet 341 penetrating the entire liquid cooling plate 400 is provided at a position of the liquid cooling plate 400 corresponding to the middle beam 140, so as to guide high-temperature gas exhausted from the middle beam 140 into the sealed chamber 340. Therefore, when thermal runaway of the battery cell 110 occurs, high-temperature gas exhausted from the battery cell 110 enters the exhaust channel 200 inside the middle beam 140 through the air inlet holes 210 of the middle beam 140, enters the sealed cavity 340 through the air outlet holes 220 of the middle beam 140 and the air inlet 341 formed in the liquid cooling plate 400, and then contacts the liquid cooling plate 400.

Still further, the air inlets 210 formed at both sides of the center beam 140 are alternately spaced to ensure that the explosion-proof valve 120 does not affect the battery cell 110 opposite to the battery cell 110 when high-temperature gas is discharged.

Still further, the exhaust passages 200 formed inside the intermediate beam 140 may be communicated in the length direction, thereby improving the circulation efficiency of the high-temperature gas discharged from the battery cell 110 from the exhaust passages 200 into the sealed chamber 340. In other embodiments of the present application, the middle beam 140 may further have a spacer structure therein, and a cavity is formed between two adjacent spacer structures, thereby forming the exhaust passage 200. Each of the spaced structures defines a cavity corresponding to the explosion-proof valve 120 of one of the battery cells 110. The arrangement of the spacer structure of the intermediate beam 140 can prevent the influence between the adjacent two battery cells 110, and reduce the risk of inducing thermal runaway of the adjacent battery cells 110.

Generally, the center sill 140 is made of a metallic material and is formed through an extrusion process.

In the above embodiment, the explosion-proof valve 120 of the battery unit 110 is generally disposed toward the exhaust channel 200 disposed on the middle beam 140, and the purpose of the valve is to effectively guide the exhaust of high-temperature gas for the battery unit with thermal runaway, so as to prevent the high-temperature gas from affecting the adjacent battery units and reduce the risk of thermal runaway occurring in cascade connection of the battery packs.

In other embodiments of the present application, if more than three rows of battery cells 110 are included in the battery module 100, the side plates 130 and the intermediate beams 140 may be optionally disposed on the battery module 100, and the structure thereof is similar to that described in the above two embodiments. When the battery module 100 has both the side plate 130 and the middle beam 140, the liquid-cooled plate 400 and the sealing cover 300 form the sealing chamber 340, which is similar to the structure of the battery module with only the side plate 130 and only the middle beam 140, and the present application will not be further described. The related structure in the present embodiment can be derived by those skilled in the art from the above two embodiments. And at this time the explosion-proof valve 120 of the battery cell 110 may be selectively disposed toward the exhaust passage 200 provided at the side plate 130 or the exhaust passage 200 provided at the intermediate beam 140.

In the embodiment of the present application, the exhaust duct 200 is formed by the side plate 130 or the middle beam 140 included in the module itself, and compared with the prior art in which the exhaust duct 200 is separately provided, the structural design of the exhaust duct 200 disclosed in the present application can improve the utilization rate of the internal space of the battery pack 10, improve the energy density of the battery pack 10, and reduce the manufacturing cost of the battery pack 10.

In the embodiment of the present application, as shown in fig. 1, the battery pack 10 is further provided with a battery pack explosion-proof valve 360, and the battery pack explosion-proof valve 360 is disposed at the air outlet 342 of the sealed chamber 340 (the air outlet 342 is not shown in the figure). When the pressure of the gas stored in the sealing chamber 340 reaches a certain value, the battery pack explosion-proof valve 360 may be opened to discharge the cooled gas out of the battery pack 10.

In conclusion, the battery pack disclosed by the application can effectively discharge high-temperature gas generated by electrolyte out of the battery unit after the battery unit is out of thermal runaway, and guide the high-temperature gas to enter the sealing cavity. The liquid cooling plate is used for cooling high-temperature gas entering the sealing cavity, and further reducing secondary damage of the high-temperature gas to battery cells inside the battery pack and related structural parts and functional parts. And the battery package that this application disclosed can also store thermal runaway battery unit combustion gas through sealed chamber, prevents just to require to change battery unit when battery unit thermal runaway appears, and then reduces the cost of maintenance of battery package. In addition, the battery package that this application discloses can also be through sealed chamber outside the battery unit exhaust gas discharge battery package after with the cooling, because this gas is through the cooling of liquid cold plate, consequently can not lead to the fact the injury to the outer structure of battery package and functional part, improve the security of battery package.

In the description of the present invention, it is to be understood that the terms "central," "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 are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the 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 of the 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," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. 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 being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., 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 invention. 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 above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A battery pack, comprising:

the liquid cooling plate is arranged on the battery module;

the exhaust channel is provided with an air inlet hole which is matched with the explosion-proof valve, and the exhaust channel is also provided with an air outlet hole which is communicated with the air inlet;

2. The battery pack of claim 1, wherein the sealing cover has a sealing protrusion thereon, the sealing protrusion enclosing an area, and the liquid cooling plate is disposed on the sealing protrusion to form the sealing cavity.

3. The battery pack according to claim 2, wherein a side plate is provided on one side of the battery module, a protruding structure that is away from the battery module is provided on one side of the side plate that is close to the sealed cavity, the protruding structure forms the exhaust passage, and the explosion-proof valve of the battery unit is located in the protruding structure of the side plate.

4. The battery pack according to claim 2 or 3, wherein the battery module comprises at least two rows of battery units, a middle beam is arranged between two adjacent rows of battery units, the exhaust channel is formed in the middle beam, the explosion-proof valve of each battery unit is arranged towards the middle beam, an air inlet hole is formed in the position, in contact with the explosion-proof valve of each battery unit, of the middle beam, and an air outlet hole is formed in one side, in contact with the liquid cooling plate, of the middle beam.

5. The battery pack of claim 4, wherein the plurality of air inlets are alternately spaced on both sides of the center sill.

6. The battery pack of claim 2, wherein the sealing cover has a support structure for supporting the liquid cooling plate.

7. The battery pack of claim 3, wherein the side plate is fixedly connected to the sealing protrusion to form a mating communication between the air outlet and the air inlet.

8. The battery pack of claim 5, wherein the liquid cooling plate is provided with an air inlet, the air inlet penetrates through the liquid cooling plate, and an air outlet formed in the middle beam is in fit communication with the air inlet formed in the liquid cooling plate.

9. The battery pack of claim 1, wherein the sealing cover is a battery pack upper cover or a battery pack tray.

10. The battery pack of claim 1, wherein the sealed chamber further comprises an air outlet, and the air outlet is internally provided with a battery pack explosion-proof valve.