A safe sodium-ion battery pack

Abstract

The application discloses a safe sodium ion battery pack and relates to the technical field of battery packs.The application comprises a battery core shell outside which is sleeved with a battery core, an outer protective shell is arranged outside the battery core shell, a locking cavity is arranged in the middle of the battery core, a locking mechanism is arranged in the battery core along the locking cavity and sequentially passes through the battery core shell and the outer protective shell, an air ring chamber is arranged between the outer protective shell and the battery core shell, a sealing ring is arranged on the top of the air ring chamber, an exhaust assembly is arranged inside the locking mechanism, a fire extinguishing mechanism is arranged on one side of the air ring chamber inside the outer protective shell, and a heat conduction plate is arranged on one side of the outer protective shell outside.The locking mechanism and the sealing ring are arranged, so that the high-temperature gas and the flame outside are prevented from entering the battery to cause damage to the battery, the safety of the battery when catching fire is improved, the fire extinguishing mechanism and the exhaust assembly are arranged, so that all the environments around the inside and outside of the battery are in the state of being filled with fire extinguishing gas, and the protection range of the battery pack is expanded.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of battery packs, in particular to a safe sodium ion battery pack. BACKGROUND

[0002] The sodium ion battery uses sodium ions (Na + ) as charge carriers, and has the advantages of low cost, rich resources and environmental friendliness due to its much higher reserves than lithium ions, and is mainly suitable for scenes with low energy density requirements, such as miniature electric vehicles, low-speed electric vehicles and energy storage systems. With the progress of technology, the application range of sodium ion batteries is expected to further expand. Since sodium ion battery packs are currently mainly used in electric vehicles and other vehicles, it is necessary to ensure the safety of the sodium ion battery packs during use.

[0003] The patent specification with the publication number CN116903546B discloses a sodium ion battery pack with a fire extinguishing function and a vehicle. The exhaust valve of the sodium ion battery pack has the performance of one-way large-flow ventilation, which can prevent external oxygen from entering the inside of the battery pack and prevent external gaseous and liquid water from entering the inside of the battery pack.

[0004] The technical scheme has the following disadvantages: first, it monitors the external high temperature by installing a temperature-sensitive glass ball inside the battery. When the external temperature is too high, the glass ball breaks and the internal fire extinguishing agent evaporates to extinguish the fire. Since it is installed at the bottom of the ejectable exhaust valve, in order to ensure that the exhaust valve can be ejected in time in case of fire, the sealing performance of the installation is low. Lower sealing will lead to the risk of fire entering the battery while extinguishing the fire, that is, the scheme cannot balance the stability of fire extinguishing and the sealing performance of the battery, and there is a problem of insufficient sealing structure, which affects the safety of the battery in a high-temperature environment. Second, the installation of the fire extinguishing agent is only in the middle part of the battery, and the whole battery is in a flame environment when a fire occurs. The fire extinguishing agent concentrated in the middle cannot stably balance the fire extinguishing capacity of the whole battery, that is, the fire extinguishing agent of the scheme cannot completely extinguish the fire around the battery, and the protection range is limited. SUMMARY

[0005] The purpose of the present application is to provide a safe sodium ion battery pack, and the technical problems to be solved are as follows: the existing sodium ion battery cannot maintain the sealing performance of the battery itself when extinguishing the fire, and the extinguishing range is small during the extinguishing process.

[0006] The purpose of the present application can be achieved by the following technical scheme:

[0007] The utility model provides a safe type sodium ion battery package, including the electric core, the electric core is externally sleeved with the electric core shell, the electric core shell is externally provided with the outer shell, the electric core middle part is provided with the locking cavity, the electric core passes the electric core shell and the outer shell along the locking cavity and is installed locking mechanism, the outer shell with the electric core shell between is provided with ring air chamber, the ring air chamber top is provided with sealing ring, the locking mechanism is used for cooperation sealing ring sealed battery package, locking mechanism inside is provided with exhaust component, the outer shell inside one side of ring air chamber is provided with fire extinguishing mechanism, the outer shell outside one side is installed heat conduction plate, heat conduction plate is used for cooperation exhaust component and fire extinguishing mechanism and is extinguished to battery package.

[0008] As a further scheme of the utility model: the locking mechanism includes the base fixedly installed on the top of the electric core, the locking rod is slidably connected in the middle of the base, the guide piece is rotatably connected to the top of the locking rod, the support arm is fixedly connected to one side of the base, the buckle pressing piece is installed between the support arm and the guide piece, and the locking rod extends through the electric core into the locking cavity.

[0009] As a further scheme of the utility model: the outer shell is installed with a rotating handle below the locking rod, the lock catch is installed on the top end of the rotating handle, and the lock catch is threadedly connected with the bottom of the locking rod.

[0010] As a further scheme of the utility model: the sealing ring includes a ring baffle fixedly connected to the inner side of the top of the outer shell, the ring baffle is adapted to be provided with a ring baffle ring on the same horizontal plane of the ring baffle, and the bottom surface of the sealing ring abuts against the ring baffle and the ring baffle ring.

[0011] As a further scheme of the utility model: the fire extinguishing mechanism includes a fire extinguishing chamber arranged in the inner part of the outer shell, the fire extinguishing chamber is filled with fire extinguishing agent, the rotating shaft is installed between the top ends of the two winding clockwork, the encapsulating film is installed between the bottoms of the two winding clockwork, and the fuse is installed between the heat conduction plate and the encapsulating film.

[0012] As a further scheme of the utility model: the exhaust component includes gas outlets formed on both sides of the base, the spring is fixedly connected to the inside of the same horizontal plane of the gas outlet of the locking rod, the gas baffle is fixedly connected to the bottom of the spring, the air duct is arranged in the middle of the locking rod, and the air duct is arranged with air connection strip ports on both sides.

[0013] As a further scheme of the present application: the top of the battery cell is provided with a handle, the locking cavity is arranged in the middle of the bottom of the battery cell, both of the locking rods are arranged in the locking cavity, and the lock is arranged at the bottom of the locking cavity.

[0014] As a further scheme of the present application: the ring air chamber is communicated with the locking cavity, and air vents are arranged on both sides of the battery cell shell and the locking cavity.

[0015] The present application has the following beneficial effects:

[0016] 1. In the present application, the locking mechanism and the sealing ring are arranged between the battery cell and the battery cell shell and the outer shell, the locking mechanism is used for the overall detachable locking operation of the battery pack, the ring baffle and the ring stop ring arranged between the top of the battery cell shell and the outer shell are used for sealing the top of the ring air chamber in the battery, so that the battery pack can maintain the overall sealing state in the fire state, the external high-temperature gas and flame are prevented from entering the battery to cause damage to the battery, and the safety of the battery in the fire is improved.

[0017] 2. In the present application, the fire extinguishing mechanism is arranged on one side of the outer shell, and the exhaust assembly is arranged at the locking mechanism, when the external temperature rises, the fuse of the fire extinguishing mechanism is melted, the fire extinguishing agent in the fire extinguishing chamber is released into the ring air chamber, and enters the locking rod through the air receiving strip port of the exhaust assembly and is discharged from the top air outlet, and when the internal air pressure is in the normal state, the air baffle of the exhaust assembly is still in the state of sealing the battery pack, which aims to make the battery pack only exhaust outward when the fire occurs, and always maintain the sealing performance of the inside, to ensure the safety of the internal battery pack.

[0018] Further, since the ring air chamber and the locking cavity are arranged at all positions of the battery cell battery pack, when the fire extinguishing agent enters the ring air chamber, the internal gas pushes the air baffle to be discharged to the outside, so that all the environments inside and outside the battery are in the state of being filled with fire extinguishing gas, thereby further increasing the fire extinguishing range and improving the environmental safety. BRIEF DESCRIPTION OF DRAWINGS

[0019] The present application will be further described below with reference to the drawings.

[0020] Figure 1 is a schematic diagram of the overall structure of the present application;

[0021] Figure 2 is a schematic diagram of the bottom structure of the present application;

[0022] Figure 3 is an explosion diagram of the present application;

[0023] Figure 4 is a schematic diagram of the structure of the battery cell of the present application;

[0024] Figure 5 is a half sectional view of the battery cell shell and the outer shell of the present application;

[0025] Figure 6 is a partial sectional view of the bottom of the sealing ring of the battery cell shell and the outer shell of the present application;

[0026] Figure 7 is a schematic view of the overall structure of the locking mechanism of the present application;

[0027] Figure 8 is a detailed enlarged view of A in the present application; Figure 1

[0028] Figure 9 is a detailed enlarged view of C in the present application; Figure 5

[0029] Figure 10 is a detailed enlarged view of E in the present application; Figure 7

[0030] Figure 11 is a detailed enlarged view of B in the present application; Figure 3

[0031] Figure 12 is a detailed enlarged view of D in the present application; Figure 5

[0032] Figure 13 is a detailed enlarged view of F in the present application. Figure 7

[0033] Figure: 1, battery cell; 2, battery cell shell; 3, outer shell; 4, locking cavity; 5, locking mechanism; 51, base; 52, locking rod; 53, guide sheet; 54, support arm; 55, buckle sheet; 56, rotating handle; 57, lock; 58, return spring; 6, ring air chamber; 7, sealing ring; 8, exhaust assembly; 81, air outlet; 82, spring; 83, air baffle; 84, air duct; 85, air bar mouth; 9, fire extinguishing mechanism; 91, fire extinguishing chamber; 92, winding spring; 93, rotating shaft; 94, encapsulating film; 95, fuse; 10, heat conducting plate; 11, handle; 12, sealing ring; 13, ring baffle; 14, ring baffle ring; 15, air passage. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. ​​​​​​

[0035] As Figures 1 to 13 shown, a safe type sodium ion battery pack, including the electric core 1, the electric core 1 outside the electric core shell 2 is set, the electric core shell 2 outside is provided with the outer shell 3, the electric core 1 middle part is provided with the locking cavity 4, the electric core 1 along the locking cavity 4 in turn passes through the electric core shell 2 and the outer shell 3 installation locking mechanism 5, the outer shell 3 inside and the electric core shell 2 outside between the ring air chamber 6 is provided, the ring air chamber 6 and the locking cavity 4 are communicated, the ring air chamber 6 top is provided with the sealing ring 7, the locking mechanism 5 is used for cooperating sealing ring 7 sealed battery pack; Locking mechanism 5 inside is provided with exhaust assembly 8, the outer shell 3 inside in the ring air chamber 6 one side is provided with fire extinguishing mechanism 9, the outer shell 3 outside one side installation heat conduction plate 10, heat conduction plate 10 is used for cooperating exhaust assembly 8 and fire extinguishing mechanism 9 to the battery pack is extinguished.

[0036] Need to be explained, the electric core 1 top installation rotatable handle 11, for portable transfer battery pack, because it is used for micro electric vehicle, actual use has the actual demand of transfer battery pack, handle 11 is convenient for its carrying, its bottom is two groups of battery group, each group of battery group is provided with ten battery units, to provide enough electric capacity, locking cavity 4 is arranged in the middle position between two groups of battery group (see Figure 4 ), The electric core 1 bottom is fixedly connected with sealing ring 12 directly above the sealing ring 7, for cooperating sealing ring 7 to seal the inside of the battery.

[0037] As Figure 1 , Figure 2 , Figure 7 , Figure 8 And Figure 10 shown, locking mechanism 5 includes the fixed installation in the electric core 1 top base 51, the base 51 middle part is slidably connected with locking rod 52, the locking rod 52 top rotary connection with the guide piece 53, the base 51 one side is fixedly connected with support arm 54, support arm 54 and guide piece 53 between installation buckle piece 55, locking rod 52 extends to the locking cavity 4 through the electric core 1, the outer shell 3 is installed in the locking rod 52 directly below the rotating handle 56, rotating handle 56 top end installation lock 57, lock 57 and locking rod 52 bottom screw connection;

[0038] It needs to be explained that when the battery pack needs to be locked, the locking rod 52 is pressed down to the locking position by pressing the buckle piece 55, and then the rotating handle 56 at the bottom of the battery pack is rotated to connect the lock catch 57 with the bottom of the locking rod 52, until it is locked. Since the rotating handle 56 is installed between the battery cell shell 2 and the outer shell 3, and the locking rod 52 extends downward from the battery cell 1, when the two are connected, the locking function of the whole battery pack can be completed. When the battery pack needs to be unlocked, the rotating handle 56 is rotated in the opposite direction to separate the locking rod 52 from the lock catch 57, and at the same time, the buckle piece 55 is lifted up to separate the battery cell 1 from the two shells. In addition, the bottom of the rotating handle 56 is provided with a reset spring 58 to assist the rebound of the lock catch 57 when it is unlocked.

[0039] As shown in Figure 4 , Figure 5 and Figure 9 , the sealing ring 7 includes a ring baffle 13 fixedly connected to the inner side of the top of the outer shell 3, and the battery cell shell 2 is provided with a ring baffle ring 14 adapted to the ring baffle 13 at the same level, and the bottom surface of the sealing ring 12 abuts between the ring baffle 13 and the ring baffle ring 14;

[0040] It needs to be explained that after the locking mechanism 5 completes the locking of the battery cell 1, the battery cell shell 2 and the outer shell 3, the annular sealing ring 12 installed at the bottom of the battery cell 1 is immediately abutted against the ring baffle 13 and the ring baffle ring 14. Since the bottom surface of the ring baffle 13 and the ring baffle ring 14 is the ring air chamber 6 around the battery pack, when the fire extinguishing gas generated by the fire extinguishing agent reacts, it can effectively prevent the external high temperature flame from invading the inside of the battery through the gap between the battery cell shell 2 and the outer shell 3. At the same time, the locking mechanism 5 effectively seals the battery pack installed at the bottom, so that the fire extinguishing gas works while considering the sealing of the battery pack, improving the fire extinguishing safety.

[0041] As shown in Figure 3 , Figure 5 , Figure 9 , Figure 11 and Figure 12 , the fire extinguishing mechanism 9 includes a fire extinguishing chamber 91 arranged inside the outer shell 3, the fire extinguishing chamber 91 is filled with fire extinguishing agent, the fire extinguishing chamber 91 is provided with two winding springs 92 at the top, the two winding springs 92 are provided with a rotating shaft 93 between them, the two winding springs 92 are provided with an encapsulation film 94 between them, and the heat conducting plate 10 is provided with a fuse 95 between the encapsulation film 94;

[0042] It should be noted that, preferably, the fire extinguishing agent is sodium bicarbonate, which slowly decomposes at 50 degrees, violently and completely decomposes at 270 degrees, and generates a large amount of carbon dioxide during the decomposition process, which can be used to isolate the oxygen inside the battery pack, and achieve the purpose of extinguishing the fire, which is sealed in the fire extinguishing chamber 91 in the unsealed state, and does not decompose, when the ambient temperature rises, the heat energy outside the battery is transmitted to the fuse bar 95 through the heat conduction plate 10, and the fuse bar 95 is melted, preferably, the fuse bar 95 is a tin bar, and the melting point is 230 degrees, after melting, the two winding up of the fuse bar 92 drives the packaging film 94 sealing the fire extinguishing agent to wind up to the rotating shaft 93, and the fire extinguishing agent is unsealed and decomposed to generate a large amount of carbon dioxide;

[0043] As shown in Figures 6 to 8 、 Figure 13 The two sides of the battery cell shell 2 are provided with air vents 15 matched with the locking cavities 4, the exhaust assembly 8 comprises air outlets 81 provided on both sides of the base 51, the locking rod 52 is fixedly connected with springs 82 inside the air outlets 81 and horizontal planes, the springs 82 are fixedly connected with air baffles 83 at the bottom, the locking rod 52 is provided with air channels 84 in the middle, and the air strip openings 85 are arranged at the middle of the locking cavities 4;

[0044] It should be noted that the ring air chamber 6 is arranged at the bottom of the sealing ring 7 and communicates with the locking cavity 4, since the ring air chamber 6 is arranged around the battery along the two battery groups, when the fire extinguishing agent is unsealed to generate carbon dioxide, the carbon dioxide can be filled in all positions of the internal battery group through the ring air chamber 6, the air vents 15 and the locking cavities 4, so that the protection ability of the battery as a whole is ensured, and the overall extinguishing ability is improved, at the same time, with the increase of the internal air pressure, the carbon dioxide reaches the air baffles 83 along the air strip openings 85, the springs 82 are compressed under the force, and then the carbon dioxide gas is transmitted to the outside of the battery pack through the air outlets 81, so that the inside and outside of the battery pack are in a carbon dioxide environment, and the safety of the battery pack is further improved, at the same time, when no fire occurs, the air baffles 83 are pushed below the air outlets 81 by the elastic force of the springs 82, and the sealing performance of the battery pack as a whole is maintained.

[0045] The working principle of the application is as follows:

[0046] By installing the locking mechanism 5 between the electric core 1 and the electric core shell 2 and the outer shell 3, cooperating with the sealing effect of the sealing ring 12 on the internal sealing ring 7 of the battery pack, the sealing performance of the battery pack inside can be ensured when on fire, and the open fire enters the battery inside, directly damages the battery pack body, effectively prevents the damage and further combustion of the battery pack, and the problem of explosion. At the same time, with the help of the fire extinguishing mechanism 9 installed in the outer shell 3, cooperating with the melting effect of the heat conducting plate 10 on the fuse link 95, the fire extinguishing agent is released into the ring air chamber 6, with the help of the communication between the ring air chamber 6 and the locking cavity 4, the locking rod 52 in the locking cavity 4 is temporarily communicated with the outside when the internal air pressure rises, so that the carbon dioxide filled in the inside can be discharged to the outside of the battery pack, so that the inside and outside of the battery pack are in the environment of high concentration of carbon dioxide when on fire, so as to isolate oxygen, and achieve the safety environment of overall fire extinguishing.

[0047] The above describes one embodiment of the present application in detail, but the content described is only the preferred embodiment of the present application, and cannot be considered as limiting the scope of the present application. Any equivalent changes and improvements made according to the scope of the present application should still belong to the scope of the present application.

Claims

1. A safety type sodium ion battery pack, comprising a battery cell (1), an outer surface of the battery cell (1) is sleeved with a battery cell shell (2), and an outer surface of the battery cell shell (2) is provided with an outer protective shell (3), characterized in that, The middle of the battery cell (1) is provided with a locking cavity (4), the battery cell (1) is sequentially installed through the locking cavity (4) and the outer shell (3) is provided with a locking mechanism (5), the outer shell (3) and the battery cell shell (2) are provided with an annular air chamber (6), the top of the annular air chamber (6) is provided with a sealing ring (7), the locking mechanism (5) is used for cooperating with the sealing ring (7) to seal the battery pack, the inside of the locking mechanism (5) is provided with an exhaust assembly (8), one side of the inside of the outer shell (3) is provided with a fire extinguishing mechanism (9), one side of the outside of the outer shell (3) is installed with a heat conducting plate (10), the heat conducting plate (10) is used for cooperating with the exhaust assembly (8) and the fire extinguishing mechanism (9) to extinguish the fire of the battery pack. The fire extinguishing mechanism (9) comprises a fire extinguishing chamber (91) arranged in the inside of the outer shell (3), the fire extinguishing chamber (91) is filled with fire extinguishing agent, both sides of the top of the fire extinguishing chamber (91) are installed with a winding spring (92), the top of the two winding springs (92) is installed with a rotating shaft (93), the bottom of the two winding springs (92) is installed with an encapsulation film (94), the heat conducting plate (10) and the encapsulation film (94) are installed with a fuse (95).

2. The safety type sodium-ion battery pack according to claim 1, characterized in that, The locking mechanism (5) comprises a base (51) fixedly installed on the top of the battery cell (1), the middle of the base (51) is slidably connected with a locking rod (52), the top of the locking rod (52) is rotatably connected with a guide plate (53), one side of the base (51) is fixedly connected with a supporting arm (54), the supporting arm (54) and the guide plate (53) are installed with a buckling piece (55), the locking rod (52) extends through the battery cell (1) and extends into the locking cavity (4).

3. The safety type sodium-ion battery pack according to claim 2, characterized in that, The outer shell (3) is installed with a rotating handle (56) below the locking rod (52), the top of the rotating handle (56) is installed with a lock (57), the lock (57) is threadedly connected with the bottom of the locking rod (52).

4. The safety-type sodium-ion battery pack of claim 1, wherein, The bottom of the battery cell (1) is fixedly connected with a sealing ring (12) above the sealing ring (7), the sealing ring (7) comprises a ring baffle (13) fixedly connected to the inside of the top of the outer shell (3), the battery cell shell (2) is adaptively provided with a ring blocking ring (14) at the same horizontal plane of the ring baffle (13), the bottom surface of the sealing ring (12) abuts against the ring baffle (13) and the ring blocking ring (14).

5. The safety type sodium-ion battery pack of claim 3, wherein, The exhaust assembly (8) comprises gas outlets (81) formed on both sides of the base (51), the inside of the locking rod (52) is fixedly connected with a spring (82) at the same horizontal plane of the gas outlet (81), the bottom of the spring (82) is fixedly connected with a gas baffle (83), the middle of the locking rod (52) is provided with an air duct (84), the air duct (84) is located in the middle of the locking cavity (4), and both sides are provided with air receiving strip openings (85).

6. The safety type sodium-ion battery pack of claim 3, wherein, The electric core (1) top is equipped with handle (11), the locking cavity (4) is arranged in the electric core (1) bottom middle part, two locking rods (52) are located in the locking cavity (4), and the lock (57) is located at the bottom of the locking cavity (4).

7. The safety type sodium-ion battery pack of claim 1, wherein, The ring air chamber (6) is communicated with the locking cavity (4), and the electric core shell (2) two sides are adapted to the locking cavity (4) and are provided with air outlet (15).

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