CN217334327U

CN217334327U - Battery pack and vehicle

Info

Publication number: CN217334327U
Application number: CN202221171486.1U
Authority: CN
Inventors: 谭礼忠
Original assignee: Xiaomi Automobile Technology Co Ltd
Current assignee: Xiaomi Automobile Technology Co Ltd
Priority date: 2022-05-16
Filing date: 2022-05-16
Publication date: 2022-08-30
Anticipated expiration: 2032-05-16

Abstract

The utility model provides a battery package and vehicle relates to battery technical field. The battery pack includes: a battery box and at least one battery cell; the battery box is internally provided with an accommodating cavity; each battery cell in the at least one battery cell comprises a battery cell shell and a battery cell pressure relief valve respectively; the battery cell pressure relief valve is positioned on the first end surface of the battery cell shell; the battery cell shell is located and holds the intracavity, and first terminal surface is close to and holds the bottom inner wall in chamber, and holds and form exhaust passage between the bottom inner wall in chamber. In some embodiments, the second end surface of the cell casing is connected with the top inner wall of the accommodating cavity; the second end surface is opposite to the first end surface. The utility model discloses a battery pack, electric core thermal runaway takes place the back, and solid-state material and high temperature electrolyte are followed the direction of gravity and are followed the blowout of bottom inner wall, and high temperature gas is discharged along exhaust passage, and solid-state material and electrolyte deposit under the action of gravity avoid contacting with conducting structure or other electric cores.

Description

Battery pack and vehicle

Technical Field

The utility model relates to a battery technology field, in particular to battery package and vehicle.

Background

The battery pack, or power battery, refers to a power source capable of providing power for vehicles such as electric cars, electric trains, electric bicycles, golf carts, and the like. The safety of the battery pack is crucial to the safety of the vehicle, and the biggest hidden danger faced by the battery pack is that when the inside of the battery pack is short-circuited or the battery core is out of control due to heat, the temperature and the pressure inside the battery pack rapidly rise, even explode, and the vehicle safety is damaged.

In the related art, a pressure relief structure is usually arranged in a battery pack to quickly exhaust air, so that explosion caused by over expansion is avoided. However, because the design of the pressure relief structure is not reasonable, high-temperature metal debris, electrolyte and the like generated by the thermal runaway cell are easily splashed on the conductive structure or other cells, so that the conductive structure is short-circuited or other cells are in linkage thermal runaway, internal thermal spread occurs, and the thermal runaway of the battery pack is aggravated.

SUMMERY OF THE UTILITY MODEL

The utility model provides a battery package and vehicle can solve pressure release structural design unreasonable, can appear the problem that heat stretchs in the battery package.

The technical scheme is as follows:

in one aspect, there is provided a battery pack including: a battery box and at least one battery cell;

the battery box is internally provided with an accommodating cavity;

each battery cell in the at least one battery cell comprises a battery cell shell and a battery cell pressure relief valve; the battery cell pressure relief valve is positioned on the first end face of the battery cell shell;

the battery cell shell is located in the accommodating cavity, the first end face is close to the inner wall of the bottom of the accommodating cavity, and an exhaust channel is formed between the first end face and the inner wall of the bottom of the accommodating cavity.

In some embodiments, the second end surface of the cell casing is connected with the top inner wall of the accommodating cavity; the second end face is opposite to the first end face.

In some embodiments, the second end surface is adhesively attached to the top interior wall of the receiving cavity.

In some embodiments, the cell relief valve is formed by thinning or scoring the cell casing.

In some embodiments, the battery pack further comprises at least one filter structure; the at least one filter structure is located within the exhaust passage;

each filter structure in the at least one filter structure corresponds to one of the battery cell pressure relief valves respectively, and the at least one filter structure is used for filtering solid substances discharged by the battery cell pressure relief valves.

In some embodiments, each of the at least one filter structure includes a plurality of grids, and the grids are spaced apart from each other on the peripheral side of one of the cell pressure relief valves.

In some embodiments, the battery pack further comprises a support structure; the supporting structure is located on the side of the first end face, and the supporting structure is supported between the first end face and the inner wall of the containing cavity.

In some embodiments, the battery pack further comprises a protective panel; the protective plate is positioned between the first end face and the inner wall of the accommodating cavity;

the plurality of grids are connected with the guard plate, and the plurality of grids extend along the guard plate surface towards the first end surface.

In some embodiments, the shield panel further comprises at least one relief portion located on a surface of the shield panel facing the first end face;

each of the at least one avoidance part corresponds to one of the cell relief valves.

In some embodiments, the battery pack further comprises a high temperature resistant plate between the protective plate and the inner wall of the receiving cavity;

each avoidance part in the at least one avoidance part is respectively communicated with the high-temperature-resistant plate, and the surface of the high-temperature-resistant plate forms the bottom wall of the at least one avoidance part.

In some embodiments, the battery pack further comprises a temperature control assembly;

the temperature control assembly comprises a heat exchange plate, a water pump and a circulating pipeline; the heat exchange plate is connected with the water pump through the circulating pipeline; the heat exchange plate is in contact connection with the at least one battery cell, and the heat exchange plate can exchange heat with the at least one battery cell.

In some embodiments, the battery box comprises a first housing, a second housing, and at least two pressure relief valves;

the first shell is positioned on the top of the second shell, and the first shell and the second shell enclose the accommodating cavity;

the at least two pressure release valves are located on the side wall of the battery box and are respectively communicated with the exhaust channel.

In some embodiments, the cell further comprises a pole, the pole being located at the first end face;

the battery pack further comprises a conductive structure, and the conductive structure is electrically connected with the pole.

In some embodiments, the battery pack further includes a battery management module, where the battery management module is electrically connected to the at least one battery cell, and the battery management module is configured to detect and feed back an operating state of the at least one battery cell.

On the other hand, a vehicle is provided, the vehicle includes the utility model discloses a battery package.

The utility model provides a beneficial effect that technical scheme brought includes at least:

the utility model discloses a battery pack, including battery box and at least one electric core, electric core includes electric core shell and electric core relief valve, and electric core shell is located and holds the intracavity, and the first terminal surface of the electric core shell at electric core relief valve place is close to the bottom inner wall that holds the chamber, and forms exhaust passage between the bottom inner wall that holds the chamber. After electric core thermal runaway took place, behind electric core relief valve was broken to solid state material and the high temperature electrolyte that the electric core structure damage produced, along the blowout of gravity direction orientation bottom inner wall, high temperature gas discharged along exhaust passage, and solid state material and electrolyte deposit is in the bottom that holds the chamber under the action of gravity to avoid contacting with conductive structure or other electric cores, block the inside heat of battery package and spread, reduce the danger of battery package thermal runaway.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a sectional view of a battery pack according to an embodiment of the present invention;

fig. 2 is a schematic position diagram of a single battery cell and a battery box provided in an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a filtering structure provided by an embodiment of the present invention;

fig. 4 is an exploded view of a battery pack according to an embodiment of the present invention;

fig. 5 is an assembly schematic diagram of a temperature control assembly and a battery cell provided in an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a first end surface of a battery cell provided in an embodiment of the present invention;

fig. 7 is a block diagram of a vehicle according to an embodiment of the present invention.

The reference numerals in the figures are denoted respectively by:

1. a battery case; 11. an accommodating chamber; 111. a top inner wall; 112. a bottom inner wall; 12. a first housing; 13. a second housing; 14. a pressure relief valve;

2. an electric core; 21. a cell shell; 211. a first end face; 212. a second end face; 22. a battery cell pressure relief valve; 23. a pole column;

3. an exhaust passage;

4. a filter structure; 41. a gate body;

5. a support structure;

6. a protective plate; 61. an avoidance part;

7. a high temperature resistant plate;

8. a temperature control assembly; 81. a heat exchange plate; 82. a water pump; 83. a circulation line;

100. a battery pack; 200. a motor system; 300. a charging system; 400. a central control system; 500. a thermal management system; 600. an air conditioning system;

G. the direction of gravity.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.

It should be understood that the terms of orientation in the embodiments of the present invention, such as "upper", "lower", "top", "bottom", "front", "back", "side", etc., refer to the battery box as being arranged in an orientation, wherein the first housing is located at the top or upper position, the second housing is located at the bottom or lower position, and the portion between the top and the bottom is the side. The embodiments of the present invention use these terms only for the purpose of describing the structures and the relationships between the structures more clearly, and not for the purpose of describing absolute orientations, and therefore should not be construed as limiting the present invention.

The battery pack, or power battery, refers to a power source capable of providing power for vehicles such as electric cars, electric trains, electric bicycles, golf carts, and the like. A battery pack is generally composed of several battery cells, a thermal management system, a Battery Management System (BMS), an electrical system, and a structural member, such as a battery box, etc. The battery unit is a modular battery pack formed by connecting a plurality of battery cells in series/parallel and adding auxiliary structural members for collecting current, collecting data, fixing and protecting the battery cells and the like, and can realize high voltage and large electric quantity required by driving the electric vehicle.

Lithium ion batteries are susceptible to thermal runaway under conditions of elevated temperatures, overcurrent loads, internal short circuits, and overvoltage. During thermal runaway, the build-up of gas can increase the internal pressure of the cell, which if not released properly, can further lead to rupture of the cell casing, causing catastrophic fire or explosion.

In the related art, a pressure relief structure is usually disposed in the battery pack, and a pressure relief valve (or referred to as a safety vent) is disposed on the battery core to release the internal pressure of the battery core by exhausting the gas generated inside the battery core.

However, in the related art, the battery cell is arranged in the battery pack, the exhaust channel is arranged at the top of the battery cell, and the battery cell pressure release valve faces upward. After thermal runaway takes place, thermal runaway's electric core internal pressure risees, breaks through the relief valve at top, and metal residue and the electrolyte of high temperature spout upwards, because the upper cover blocks and the action of gravity, it can finally fall on the upper cover of module, busbar (for example electrically conductive structure) or other electric cores, leads to heat to stretch.

Therefore, the utility model provides a battery pack, after electric core thermal runaway took place, solid-state material and high temperature electrolyte along the blowout of gravity direction, and high temperature gas is discharged along exhaust passage, and solid-state material and electrolyte deposit under the action of gravity is in the bottom that holds the chamber to avoid falling on conductive structure or other electric cores, block the inside heat of battery pack and stretch, reduce battery pack thermal runaway's danger.

In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

Fig. 1 is a cross-sectional view of a battery pack 100 according to an embodiment of the present invention; fig. 2 is a schematic position diagram of a single battery cell 2 and a battery box 1 provided in an embodiment of the present invention.

In one aspect, referring to fig. 1 and 2, the present embodiment provides a battery pack 100, where the battery pack 100 includes: a battery box 1 and at least one battery cell 2; the battery box 1 has a receiving cavity 11 therein.

Each of the at least one battery cell 2 includes a cell casing 21 and a cell relief valve 22; the cell pressure relief valve 22 is located on the first end face 211 of the cell shell 21; the cell shell 21 is located in the accommodating cavity 11, and the first end face 211 is close to the bottom inner wall 112 of the accommodating cavity 11, and forms the exhaust channel 3 with the bottom inner wall 112 of the accommodating cavity 11.

Wherein, the bottom inner wall 112 of the accommodating chamber 11 is the inner wall of the accommodating chamber 11 at the lowest along the gravity direction G, and the bottom inner wall 112 forms the lowest interface of the accommodating chamber 11.

The utility model discloses a battery pack 100, including battery box 1 and at least one electric core 2, electric core 2 includes electric core casing 21 and electric core relief valve 22, and electric core casing 21 is located and holds chamber 11, and the first terminal surface 211 of electric core casing 21 at electric core relief valve 22 place is close to the bottom inner wall 112 that holds chamber 11, and forms exhaust passage 3 between the bottom inner wall 112 that holds chamber 11.

After electric core thermal runaway takes place, behind electric core relief valve 22 was broken to solid state material and the high temperature electrolyte that the damaged production of electric core 2 structure, spout towards the bottom inner wall 112 that holds chamber 11 along the direction of gravity, high temperature gas discharges along exhaust passage 3, solid state material and electrolyte deposit under the action of gravity in the bottom that holds chamber 11, thereby avoid contacting with conducting structure or other electric core 2, block the inside heat of battery package 100 and stretch, reduce the danger of battery package 100 thermal runaway.

In addition, the battery pack 100 is usually disposed below the passenger compartment in the vehicle, and when the battery cell 2 is disposed in the battery box 1 in a manner that the battery cell pressure relief valve 22 faces upward, thermal runaway of the battery cell 2 may exhaust upward, which causes heat and flame to spread directly to the passenger compartment, thereby threatening safety of passengers. The battery pack 100 of the embodiment, electric core relief valve 22 are towards the below, and electric core 2 exhausts downwards, and flame can not directly spread to the passenger compartment, protects passenger safety, prolongs passenger's processing time in the passenger compartment.

In some possible implementations, the cell pressure relief valve 22, also called an explosion-proof sheet, an explosion-proof valve or a battery cap, can automatically open the pressure relief to prevent explosion when the internal pressure of the cell 2 is too high.

In some possible implementations, the accommodating chamber 11 includes a top inner wall 111, a bottom inner wall 112, and four side inner walls, the top inner wall 111 is located above the bottom inner wall 112 in the vertical direction (i.e., the same direction as the gravity direction and the opposite direction), the four side inner walls are enclosed between the top inner wall 111 and the bottom inner wall 112, and the top inner wall 111, the bottom inner wall 112, and the four side inner walls form the closed accommodating chamber 11.

As shown in fig. 2, in some embodiments, the second end surface 212 of the cell casing 21 is connected to the top inner wall 111 of the accommodating cavity 11 facing upward in the gravity direction; the second end surface 212 is located opposite the first end surface 211.

In the battery pack 100 of the present embodiment, the cell casing 21 is formed by connecting the second end surface 212 to the top inner wall 111 of the accommodating chamber 11, the second end surface 212 is opposite to the first end surface 211 at the position of the cell casing 21, and when the second end surface 212 is connected to the top inner wall 111 of the accommodating chamber 11, the second end surface 212 faces downward and is close to the bottom inner wall 112 of the accommodating chamber 11, and the exhaust channel 3 is formed.

In some embodiments, the second end surface 212 is adhesively attached to the top inner wall 111 of the receiving cavity 11. Illustratively, the second end surface 212 of the cell casing 21 and the top inner wall 111 of the accommodating cavity 11 are adhesively connected by a high-temperature-resistant adhesive.

In some embodiments, the cell relief valve 22 is formed by thinning or scoring the cell casing 21. In addition, the cell relief valve 22 may be formed by welding an explosion-proof film at the through hole of the cell casing 21. The strength of the cell pressure relief valve 22 is lower than that of the cell shell 21, and when the internal pressure of the cell 2 is too high, the cell pressure relief valve 22 is preferentially broken, so that pressure relief is realized.

Fig. 3 is a schematic structural diagram of a filter structure 4 according to an embodiment of the present invention.

As shown in connection with fig. 2 and 3, in some embodiments, the battery pack 100 further includes at least one filter structure 4; at least one filter structure 4 is located in the exhaust channel 3; each filter structure 4 in the at least one filter structure 4 corresponds to one of the cell pressure relief valves 22, and the at least one filter structure 4 is configured to filter solid substances discharged by the cell pressure relief valves 22.

In the embodiment, considering that the internal pressure is high when the battery cell 2 is in thermal runaway, the solid ejecta such as copper foil, aluminum foil and the like may be blocked by the bottom inner wall 112 of the accommodating cavity 11 under the entrapment of high-temperature gas or electrolyte, and randomly sputter in the exhaust channel 3, and in this process, the solid ejecta may inevitably contact with a conductive structure or other battery cells 2.

Therefore, in the battery pack 100 of this embodiment, the filter structures 4 are correspondingly arranged below the cell pressure release valve 22, the filter structures 4 correspond to the cell pressure release valve 22 one by one, and can filter ejecta in the thermal runaway process of the cell 2, so as to filter solid substances retained in the filter structures 4, and only allow components such as gas and electrolyte to enter the exhaust passage 3, thereby avoiding sputtering contact between the solid substances and the conductive structure or other cells 2, and reducing propagation of thermal runaway of the cell 2 in the battery pack 100.

As shown in fig. 3, in some embodiments, each filter structure 4 of the at least one filter structure 4 includes a plurality of grids 41, and the plurality of grids 41 are located at intervals on a peripheral side of one of the cell relief valves 22.

In the battery pack 100 of this embodiment, the filtering structure 4 is formed by the plurality of grid bodies 41 in an annular shape around the cell pressure release valve 22, and the annular grid structure formed by the plurality of grid bodies 41 encloses the spraying area of the cell pressure release valve 22, so that the filtering retention effect on the solid substances in the sprayed substances of the cell 2 is good, and the rapid discharge of gas and the like is not hindered.

In some possible implementations, to ensure that the gas can be exhausted quickly when the battery cell 2 is out of control due to heat, the exhaust area of the filtering structure 4 and the gap between the adjacent grid bodies 41 should be ensured to ensure smooth exhaust and avoid the risk of the gap being completely blocked.

As shown in connection with fig. 1, in some embodiments, the battery pack 100 further includes a support structure 5; the support structure 5 is located at the side of the first end face 211, and the support structure 5 is supported between the first end face 211 and the inner wall of the accommodating chamber 11.

In the battery pack 100 of this embodiment, after the thermal runaway of the battery cell 2, the connection between the second end surface 212 and the top inner wall 111 of the accommodating cavity 11 may fail due to the temperature increase of the battery cell 2, so that the risk of dropping the battery cell 2 may occur. The supporting structure 5 is added at the bottom of the battery cell 2 (i.e., at the first end surface 211), so that the battery cell 2 does not fall off.

In some possible implementations, the support structure 5 may be a strip of steel or a relatively rigid composite material that can be connected across two or more cells 2. Illustratively, the support structure 5 is fixed to the bottom inner wall 112 of the accommodation chamber 11.

Fig. 4 is an exploded view of a battery pack 100 according to an embodiment of the present invention.

As shown in connection with fig. 3 and 4, in some embodiments, the battery pack 100 further includes a protective plate 6; the protective plate 6 is located between the first end face 211 and the inner wall of the accommodation chamber 11; a plurality of grills 41 are connected to the shielding member 6, and the plurality of grills 41 extend along the surface of the shielding member 6 toward the first end surface 211.

In the battery pack 100 of the present embodiment, the bottom of the battery cell 2 is provided with the protection plate 6, and the protection plate 6 can perform an insulating protection function on the battery cell 2; the grid 41 of the filter structure 4 is connected to the protective plate 6, the grid 41 extends along the surface of the protective plate 6 toward the first end face 211 of the battery cell 2, the top end of the grid 41 is close to the first end face 211, and the battery cell pressure relief valve 22 is enclosed in the middle.

Protection plate 6 covers the first terminal surface 211 of whole electric core 2, with filtration 4 design on protection plate 6, plays support and fixed action to filtration 4, reduces filtration 4's the production and the assembly degree of difficulty.

In addition, filtration 4 sets up behind protection plate 6 according to the target location, pinpoints protection plate 6 and the first terminal surface 211 of electric core 2, can make filtration 4 and electric core relief valve 22 one-to-one just, guarantees that every electric core relief valve 22 all corresponds filtration 4. After any electric core 2 is out of control by heat, the ejected matter can be filtered by the filtering structure 4.

In some possible implementations, the fender 6 is made of plastic, and the plurality of grills 41 are integrally formed with the fender 6. The protective panel 6 is produced by means including, but not limited to, injection molding, calendering, thermoforming, compression molding, injection molding, and the like. The protection plate part 6 that this embodiment adopted plastics material, the bars 41 of filtration 4 can the direct forming on protection plate part 6, reduces the processing degree of difficulty of protection plate part 6 and filtration 4, reduces the production and the processing cost of battery package 100.

In other possible implementations, the support structure 5 is fixed to the fender 6, with the fender 6 providing a bottom support for the support structure 5.

As shown in connection with fig. 3, in some embodiments, the fender 6 further includes at least one relief 61, the at least one relief 61 being located on a surface of the fender 6 facing the first end surface 211; each of the at least one avoiding portion 61 corresponds to one of the cell relief valves 22.

In the battery pack 100 of the present embodiment, a position of the protection plate 6 corresponding to the cell relief valve 22 is provided with an avoiding portion 61, and the avoiding portion 61 is also located in an annular region surrounded by the filtering structure 4.

When the thermal runaway of the battery core 2 occurs, the internal pressure of the battery core 2 breaks the battery core pressure release valve 22, so that the battery core pressure release valve 22 is torn outwards and opened. At this moment, if first terminal surface 211 is less to guard plate 6's interval, the outside open space of electric core relief valve 22 is limited, can lead to the pressure release mouth too little, can not in time discharge electric core 2 internal pressure, can't realize quick pressure release, and electric core casing 21 can further be torn to the high pressure, leads to whole electric core 2 explosion even.

However, if the distance between the first end surface 211 and the shielding member 6 is simply increased, the thickness of the battery pack 100 is increased, and the compactness of the battery pack 100 is reduced.

The portion 61 of dodging is seted up on protection plate 6 of electricity core relief valve 22 below to this embodiment, under the condition that does not change first terminal surface 211 and protection plate 6 relative position, through the below space of seting up the increase electricity core relief valve 22 of portion 61 of dodging, guarantees that electricity core relief valve 22 has sufficient space of opening, guarantees to realize quick pressure release when electric core 2 thermal runaway.

In addition, the avoiding part 61 can be used for accommodating the solid substances which are filtered out by the filter structure 4 and are retained in the ejecta, so that the volume in the annular area enclosed by the filter structure 4 is increased, and the solid substances are prevented from accumulating to block the cell pressure release valve 22.

As shown in fig. 3 and 4, in some embodiments, the battery pack 100 further includes a high temperature resistant plate 7, and the high temperature resistant plate 7 is located between the protective plate 6 and the inner wall of the accommodating cavity 11; each avoidance part 61 of the at least one avoidance part 61 is respectively communicated with the high-temperature resistant plate 7, and the bottom wall of the at least one avoidance part 61 is formed on the surface of the high-temperature resistant plate 7, so that high-temperature substances sprayed out of the battery cell 2 due to thermal runaway can be prevented from directly burning the battery box 1.

The battery pack 100 of this embodiment sets up high temperature resistant plate 7 in the below of protection plate 6, can carry out adiabatic and insulating isolation with the bottom of electric core 2, guard plate and battery box 1, provides the diapire support for dodging portion 61 on the protection plate 6.

In some possible implementations, the high temperature resistant plate 7 is made of mica, aerogel, foam (e.g., silicone foam), and the like, and has excellent high temperature resistant insulating performance and excellent electrical insulating performance.

Fig. 5 is an assembly schematic diagram of the temperature control assembly 8 and the battery cell 2 provided by the embodiment of the present invention.

As shown in connection with fig. 5, in some embodiments, the battery pack 100 further includes a temperature control assembly 8; the temperature control assembly 8 comprises a heat exchange plate 81, a water pump 82 and a circulation pipeline 83; the heat exchange plate 81 is connected with a water pump 82 through a circulating pipeline 83, and the circulating pipeline 83 is filled with cooling liquid; the heat exchange plate 81 is in contact connection with at least one battery cell 2, and the heat exchange plate 81 can exchange heat with at least one battery cell 2.

The battery pack 100 of the embodiment includes the temperature control assembly 8, and exchanges heat with the electric core 2 through the heat exchange plate 81 disposed at the electric core 2, and then derives heat through the circulation pipeline 83, so as to cool the electric core 2. Conversely, the external heat may be transferred to the battery cell 2 through the circulation pipeline 83, so as to heat the battery cell 2.

In other possible implementations, the temperature control assembly 8 further includes a low-voltage battery electrically connected to the water pump 82 for providing electrical energy to the water pump 82. Illustratively, the voltage of the low-voltage battery is 12V or 24V. The low-voltage battery jar and the battery pack are power supply elements which are required to be configured according to the conventional standard of the whole vehicle.

The battery pack 100 of this embodiment has the condition that the water pump 82 can not provide electric energy after the battery pack 100 is out of control due to heat, so that the water pump 82 is driven by the low-voltage battery jar, and the normal operation of the water pump 82 is ensured.

As shown in connection with fig. 4, in some embodiments, the battery box 1 includes a first housing 12, a second housing 13, and at least two pressure relief valves 14; the first shell 12 is positioned on the top of the second shell 13, and the first shell 12 and the second shell 13 enclose an accommodating cavity 11; at least two relief valves 14 are located on the lateral wall of battery box 1, and at least two relief valves 14 communicate with exhaust passage 3 respectively.

In the battery pack 100 of this embodiment, the battery box 1 includes the first cover body, the second cover body, and at least two pressure release valves 14, and the first cover body and the second cover body are designed in a buckling manner, so as to facilitate assembly of structures such as the internal battery cell 2, the heat exchange member, the protection plate member 6, and the high temperature resistant plate member 7; the pressure release valve 14 is located on the side wall of the battery box 1 and communicated with the exhaust passage 3, so that high-pressure gas exhausted after the thermal runaway of the battery cell 2 can be exhausted out of the battery box 1, and the safety of the battery pack 100 is ensured.

In one possible implementation, at least two relief valves 14 are respectively located on the side walls of the battery case 1 in the front-rear direction of the vehicle. Illustratively, the number of pressure relief valves 14 is three. Therefore, the battery pack 100 of the embodiment can reduce the length of the exhaust channel 3 in the battery box 1, and can rapidly exhaust the gas when the thermal runaway of the electric core 2 at any position occurs.

Fig. 6 is a schematic structural diagram of the first end surface 211 of the electrical core 2 provided by the embodiment of the present invention.

As shown in fig. 6, in some embodiments, the battery cell 2 further includes a terminal post 23, where the terminal post 23 is located on the first end surface 211; battery package 100 still includes electrically conductive structure, and electrically conductive structure and utmost point post 23 electric connection realize the series connection or parallelly connected of a plurality of electric cores 2, combine to form the battery module of high voltage, big electric quantity. Illustratively, the conductive structure is a bus bar.

In some possible implementation manners, the surface of the conductive structure is wrapped by a high-temperature-resistant insulating sheath for preventing the high-temperature electrolyte from adversely affecting the conductive structure.

In some embodiments, the battery pack 100 further includes a battery management module, where the battery management module is electrically connected to the at least one battery cell 2, and the battery management module is configured to detect and feed back an operating state of the at least one battery cell 2.

In some possible implementation manners, the battery management module includes a sensor assembly and a control module, the sensor assembly is located in the electric core 2, and is capable of detecting working states of the electric core 2, such as temperature and voltage, and feeding back the working states to the control module, and the control module determines whether thermal runaway occurs in the electric core 2 according to the working states.

Electric core 2 in battery package 100 the precursor of thermal runaway appears or after taking place the thermal runaway, sensor assembly feeds back the operating condition of electric core 2 who detects to control module, control module judges that the precursor of thermal runaway appears or when taking place electric core 2 thermal runaway, input start instruction to water pump 82, the coolant liquid is under the drive of water pump 82, along circulation circuit 83 at heat transfer piece inner loop, the heat transfer piece carries out the heat exchange with electric core 2, the coolant liquid absorbs the heat and derives the heat, carry out rapid cooling to electric core 2 and hold chamber 11 etc., play and stop the thermal runaway, or prevent that the heat from stretching.

In other possible implementations, the battery management system is electrically connected to the central control system 400 of the vehicle, and the battery management system implements human-computer interaction through the central control system 400.

On the other hand, referring to fig. 7, the present embodiment provides a vehicle including the battery pack 100 of the present invention.

The vehicle of this embodiment includes the utility model discloses a battery package 100 has the utility model discloses a whole technological effects.

In some possible implementations, the vehicle includes, but is not limited to, an electric car, an electric train, an electric bicycle, a golf cart, and the like.

The vehicle further comprises one or more of the following systems: the system comprises a motor system 200, a charging system 300, a central control system 400, a thermal management system 500 and an air conditioning system 600; the motor system 200, the charging system 300, the central control system 400, the thermal management system 500, and the air conditioning system 600 are respectively and directly or indirectly electrically connected to the battery pack 100.

As used herein, the terms "plurality," "at least one," and "a plurality" refer to one or more than two. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

It is to be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be a mechanical connection; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation of the first and second features not being in direct contact, but being in contact with another feature between them. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present specification, reference to the terms "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention.

The above description is only an embodiment of the present invention, and is not intended to limit the present invention, any modification, equivalent replacement, or improvement made within the principle of the present invention should be included within the protection scope of the present invention.

Claims

1. A battery pack, characterized in that the battery pack (100) comprises: a battery box (1) and at least one battery cell (2);

the battery box (1) is internally provided with an accommodating cavity (11);

each of the at least one battery cell (2) comprises a cell casing (21) and a cell pressure relief valve (22); the cell pressure relief valve (22) is located on a first end face (211) of the cell shell (21);

the battery cell shell (21) is located in the accommodating cavity (11), the first end face (211) is close to the bottom inner wall (112) of the accommodating cavity (11), and an exhaust channel (3) is formed between the bottom inner wall (112) of the accommodating cavity (11).

2. The battery pack according to claim 1, wherein the second end face (212) of the cell housing (21) is connected to the top inner wall (111) of the accommodating cavity (11); the second end surface (212) is located opposite the first end surface (211).

3. A battery pack according to claim 2, wherein the second end face (212) is adhesively connected to the top inner wall (111) of the receiving cavity (11).

4. The battery pack of claim 1, wherein the cell pressure relief valve (22) is formed by thinning or scoring the cell casing (21).

5. The battery pack according to claim 1, wherein the battery pack (100) further comprises at least one filter structure (4); the at least one filter structure (4) is located in the exhaust channel (3);

each filtering structure (4) in the at least one filtering structure (4) corresponds to one of the cell pressure relief valves (22), and the at least one filtering structure (4) is used for filtering solid substances discharged by the cell pressure relief valves (22).

6. The battery pack according to claim 5, wherein each of the at least one filter structure (4) comprises a plurality of grids (41), and the grids (41) are spaced apart from each other around one of the cell relief valves (22).

7. The battery pack according to claim 6, wherein the battery pack (100) further comprises a support structure (5); the supporting structure (5) is located on the side of the first end face (211), and the supporting structure (5) is supported between the first end face (211) and the inner wall of the accommodating cavity (11).

8. The battery pack according to claim 6, wherein the battery pack (100) further comprises a protective plate (6); the protective plate (6) is positioned between the first end face (211) and the inner wall of the accommodating cavity (11);

the grid bodies (41) are connected with the protection plate (6), and the grid bodies (41) extend towards the first end face (211) along the surface of the protection plate (6).

9. The battery pack according to claim 8, wherein the protective plate (6) further comprises at least one relief (61), the at least one relief (61) being located on a surface of the protective plate (6) facing the first end surface (211);

each avoidance part (61) in the at least one avoidance part (61) corresponds to one of the cell pressure relief valves (22).

10. The battery pack according to claim 9, characterized in that the battery pack (100) further comprises a high temperature resistant plate (7), the high temperature resistant plate (7) being located between the protective plate (6) and the inner wall of the housing cavity (11);

each avoidance part (61) in the at least one avoidance part (61) is respectively communicated to the high-temperature-resistant plate (7), and the surface of the high-temperature-resistant plate (7) forms the bottom wall of the at least one avoidance part (61).

11. The battery pack according to claim 1, wherein the battery pack (100) further comprises a temperature control assembly (8);

the temperature control assembly (8) comprises a heat exchange plate (81), a water pump (82) and a circulating pipeline (83); the heat exchange plate (81) is connected with the water pump (82) through the circulating pipeline (83); the heat exchange plate (81) is in contact connection with the at least one electric core (2), and the heat exchange plate (81) can exchange heat with the at least one electric core (2).

12. The battery pack according to claim 1, wherein the battery box (1) comprises a first housing (12), a second housing (13) and at least two pressure relief valves (14);

the first shell (12) is positioned on the top of the second shell (13), and the first shell (12) and the second shell (13) enclose the accommodating cavity (11);

the at least two pressure release valves (14) are located on the side wall of the battery box (1), and the at least two pressure release valves (14) are communicated with the exhaust passage (3) respectively.

13. The battery pack according to claim 1, wherein the electrical core (2) further comprises a pole (23), the pole (23) being located at the first end face (211);

the battery pack (100) further comprises a conductive structure, and the conductive structure is electrically connected with the pole (23).

14. The battery pack according to any of claims 1 to 13, wherein the battery pack (100) further comprises a battery management module electrically connected to the at least one battery cell (2), the battery management module being configured to detect and feed back an operating state of the at least one battery cell (2).

15. A vehicle, characterized in that the vehicle comprises a battery pack (100) according to any one of claims 1-14.