CN114156530B - Lithium ion battery assembly and pouring method - Google Patents

Abstract

The present invention discloses a lithium-ion battery assembly and a method for casting. In this scheme, at least one lithium-ion battery is suspended in a box, and a casting space is formed between the lithium-ion battery and the inner wall and bottom of the box; a casting compound is injected into the box at one time to fill the gap between the battery and the box, and between the battery until the casting surface reaches a specified height. The lithium-ion battery casting scheme provided by the present invention can achieve one or more batteries and auxiliary parts being cast in the compound by one casting, so that the casting thickness of different parts of the battery, insulation from the battery box and other indicators meet the standard requirements, simplify the casting process, and greatly improve the casting quality and efficiency.

Description

A lithium ion battery assembly and encapsulation method

Technical Field

The present invention relates to the field of batteries, and in particular to a lithium-ion battery encapsulation technology.

Background technique

The advantages of lithium-ion batteries are mainly reflected in their high energy density, stable discharge characteristics, and long cycle life. They are widely used as power sources for various types of equipment. When lithium-ion batteries are misused and abused during use, such as overcharging, overdischarging, high temperature, short circuit, and mechanical shock, destructive exothermic chemical reactions occur inside the battery, and the heat generated exceeds its heat dissipation rate, the heat will quickly accumulate inside the battery and generate pressure, thereby accelerating the speed of the chemical reaction inside the battery, forming a vicious cycle that makes the failure more serious. If this process is not alleviated in time, the lithium battery will experience thermal runaway until the battery ruptures, releases a large amount of flammable and toxic gases, and catches fire and explodes. Therefore, in the design process of lithium-ion batteries, a safety valve is usually set between the positive and negative poles as an important safety device to alleviate the deterioration process when the lithium-ion battery fails and avoid serious accidents. Therefore, ensuring the reliable opening of the safety valve plays a vital role in the safety of lithium batteries.

In addition, lithium-ion batteries used in explosive environments (such as coal mines, chemical companies, etc.) may become ignition sources under abnormal circumstances due to the temperature of the battery surface and poles, and exposed live parts, which may ignite the explosive environment.

In order to prevent lithium-ion batteries from becoming ignition sources in explosive environments, a variety of explosion-proof types can be used, among which the cast-in type is a common method. According to the requirements of GB3836.9 standard, both the thickness of the cast-in and the various properties of the cast-in compound must be guaranteed. However, since the battery poles and connectors are higher than the safety valve, if the cast-in layer is cast according to the requirements of protecting the battery poles and connectors, the cast-in layer of the safety valve will be very thick, resulting in the safety valve being unable to open when it needs to be opened.

The existing method generally involves two or more times of casting. First, the casting compound is injected into the box to be loaded with batteries and reaches the specified height. Then the batteries are loaded to block the safety valve position. The casting compound is injected again to cast the batteries. Finally, a layer of casting is cast on the upper part of the safety valve to ensure that the casting layer of the safety valve meets the thickness required by the mask standard and does not affect the opening of the safety valve. The existing casting process is complex and inefficient. In addition, the joint surfaces of multiple castings may not fuse, forming an isolation layer, making it difficult to ensure the casting quality.

Summary of the invention

In view of the problems of complex process and low efficiency in the existing encapsulation schemes of lithium-ion batteries used in explosive environments, the purpose of the present invention is to provide a lithium-ion battery encapsulation scheme, which can achieve one-time encapsulation of lithium-ion batteries with high efficiency and quality, and meet the encapsulation requirements specified in the standards without affecting the opening of the safety valve.

In order to achieve the above object, the present invention provides a lithium ion battery assembly, which includes a box body, a support assembly, at least one lithium ion battery, a protective cover and a casting compound;

The support assembly is arranged in the box to form a lithium-ion battery placement area;

The at least one lithium-ion battery is placed in the placement area formed by the support assembly, and forms a casting space between the inner wall and the bottom of the box body;

The protective cover is arranged on the safety valve of the lithium-ion battery;

The encapsulation compound is injected into the box body at one time to fill the gaps between the battery and the box body and between the battery, and is molded into an encapsulation body at one time. The encapsulation body molded at one time covers the entire outer surface of the lithium-ion battery.

Furthermore, the protective cover includes a cover body and a cover plate. The cover body is a through-hole structure and can be arranged on the safety valve of the lithium-ion battery. The cover plate is detachably arranged on the cover body.

Furthermore, the one-step-molded encapsulation body also covers the charged parts and exposed metal parts on the lithium-ion battery.

Furthermore, the support assembly can form an overhead structure placement area within the box.

Furthermore, the supporting assembly as a whole is an insulating structure.

Furthermore, a separator is provided between adjacent lithium-ion batteries.

Furthermore, the encapsulation compound is injected once into a box containing at least one lithium-ion battery.

In order to achieve the above object, the present invention provides a lithium ion battery encapsulation method, the encapsulation method comprising:

At least one lithium-ion battery is disposed in an overhead manner in the box, and a sealing space is formed between the lithium-ion battery and the inner wall and bottom of the box;

Inject the encapsulation compound into the box at one time, filling the gaps between the battery and the box, and between the batteries, until the encapsulation surface reaches the specified height.

Furthermore, the encapsulation method provides a protective cover on the safety valve of each lithium-ion battery to form an openable protective cavity for the safety valve.

Furthermore, the encapsulation method provides a separator between adjacent lithium-ion batteries.

Furthermore, the encapsulation method completes the encapsulation in one step, and the battery surface, charged parts, and exposed metal parts are all encapsulated in the encapsulation compound.

Furthermore, the encapsulation compound is an organic silicon encapsulating compound.

The lithium-ion battery encapsulation scheme provided by the present invention can achieve one or more batteries and their accessory parts being encapsulated in a compound by encapsulation at one time, so that multiple indicators such as the encapsulation thickness of different parts of the battery and the insulation with the battery box meet the standard requirements, simplify the encapsulation process, and greatly improve the encapsulation quality and efficiency.

This lithium-ion battery encapsulation solution is particularly important for large lithium-ion battery power sources, including dozens to hundreds of single lithium-ion batteries, and has broad application prospects.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

FIG1 is an exploded view of the assembly of a lithium-ion battery box in an example of the present invention;

FIG2 is a cross-sectional view of the assembly of a lithium-ion battery box in an example of the present invention;

FIG3 is a schematic diagram of a battery fixing frame in an example of the present invention;

FIG4 is a schematic diagram of a battery support bar in an example of the present invention;

FIG5 is a schematic diagram of a safety valve protective cover in an example of the present invention;

FIG6 is a schematic diagram of a lithium-ion battery box after being cast and sealed in an example of the present invention;

FIG7 is a diagram showing the effect of a primary encapsulation of 10 lithium-ion batteries in an example of the present invention;

FIG. 8 is a diagram showing the effect of a single encapsulation of 50 lithium-ion batteries in an example of the present invention.

Detailed ways

In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below with reference to specific diagrams.

Lithium-ion batteries have been widely used as power sources for various types of equipment and instruments, but lithium-ion battery power sources used in explosive environments (such as coal mines, chemical companies, explosive dust sites, etc.) must meet explosion-proof requirements; since the current standards do not have specific requirements on the structure of lithium-ion battery power sources, the adoption of comprehensive explosion-proof protection types (explosion-proof types include flameproof type, intrinsic safety type, cast-in-place type, increased safety type, oil-immersed type, sand-filled type, etc.) may be the future development direction, among which the cast-in-place type may be the most promising explosion-proof protection type in the future.

The encapsulation requires that the battery and its external connectors are completely encapsulated in the encapsulation compound to achieve a certain thickness and strength, and the encapsulation compound must be insulated from the battery box. Furthermore, for the encapsulation compound, since the hardness of epoxy resin is high after curing, most of them are encapsulated with epoxy resin, but the encapsulated battery is difficult to disassemble again.

Furthermore, lithium-ion batteries have various voltage structures and types. Under abnormal conditions, lithium-ion batteries may experience thermal runaway, accompanied by rapid pressure release, and may even cause explosions and fires. The safety valve is the weak link of lithium-ion batteries. When the pressure rises to the set value, the safety valve opens to release the pressure and avoid the expansion of the consequences of thermal runaway. Since the height of the battery pole plus the connector is higher than the safety valve, if the battery is fully encapsulated, the thickness of the upper part of the safety valve will be very thick after encapsulation, so the safety valve may lose its pressure release function. At the same time, encapsulation around and at the bottom of the battery is also a problem.

To address this problem, multiple pouring is currently commonly used. Generally, the next pouring should be performed after the previous pouring is solidified. This multiple pouring process is complex and inefficient, and the joint surfaces of the two pourings may not be able to fuse together to form an isolation layer, resulting in the pouring strength and protection not meeting the requirements.

In this regard, the present invention provides a lithium-ion battery encapsulation solution, which can achieve encapsulation of the battery and its accessory components in a compound through one-time encapsulation, so that multiple indicators such as the encapsulation thickness of different parts of the battery and insulation from the battery box meet the standard requirements. This not only simplifies the encapsulation process, but also improves the encapsulation quality and efficiency.

Specifically, the lithium-ion battery encapsulation scheme is to place the lithium-ion battery to be encapsulated in an overhead structure in a box body, and form an encapsulation space between the lithium-ion battery and the inner wall and bottom of the box body; at the same time, a protective cover is set on the safety valve of each lithium-ion battery to form an openable protective cavity in the safety valve.

On this basis, the encapsulation compound is injected into the box at one time to fill the gaps between the battery and the box, and between the battery, until the encapsulation surface reaches the specified height. In this way, one or more lithium-ion batteries can be encapsulated in one time and the encapsulation thickness of the lithium-ion battery meets the standard requirements, simplifying the encapsulation process and improving production efficiency.

When the lithium-ion battery encapsulation scheme is implemented, the present invention also provides a lithium-ion battery box scheme, and the lithium-ion battery box can cooperate with the lithium-ion battery primary encapsulation scheme provided by the present invention.

1 and 2 , which show an exemplary implementation of the lithium-ion battery box provided by the present invention.

As can be seen from the figure, the lithium-ion battery box in this example solution is mainly composed of a box body 8, a box cover 1, a plurality of lithium-ion batteries 4, a protective cover 2, a fixing frame 6, and a support bar 7.

The box body 8 and the box cover 1 cooperate to form a box assembly for forming a placement space and carrying other components. The specific composition structure of the box body 8 and the box cover 1 is not limited here and can be determined according to actual needs.

Taking the illustrated scheme as an example, the box body 8 here adopts a square structure, and a connecting flange is formed at the port to be fixedly connected to the box cover 1.

In this example solution, a fixing frame 6 and a support bar 7 are used to cooperate in the box body 8 to form a corresponding support assembly for accommodating the lithium-ion battery 4, so that the lithium-ion battery is arranged in the box body in an overhead manner, thereby forming a sealing space between each lithium-ion battery and the inner wall and bottom of the box body.

The fixing frame 6 here matches the number of lithium-ion batteries 4 to be assembled to form a corresponding placement area to place the lithium-ion batteries 4 to be assembled to fix the placement position of the lithium-ion batteries 4. At the same time, a certain limit is formed for the lithium-ion batteries 4 to be assembled to ensure the reliability of subsequent encapsulation.

Referring to Fig. 3, it shows an example of the structure of the fixing frame 6 used in this example. The fixing frame 6 as a whole adopts a square frame structure composed of four side plates, and a plurality of slots 62 are opened at the bottom of each side plate 61 so that the corresponding casting compound can flow through the slots 62 during casting.

Here, there is no limitation on the arrangement scheme of the slots 62 at the bottom of the fixing frame 6, such as size, shape, and distribution scheme, which can be determined according to actual needs. As an example, the illustrated scheme adopts an arc-shaped slot structure with equal spacing.

The fixing frame 6 is specifically implemented by using non-metallic insulating material or metallic material. When metallic material is used, the surface in contact with the battery is covered with an insulating layer or isolated by insulating material.

Based on the above-mentioned fixing frame 6 scheme, this example scheme sets corresponding support bars 7 in the placement area formed by the fixing frame 6 to support the lithium-ion battery 4 to be assembled, so that the lithium-ion battery 4 to be assembled does not contact the bottom of the box body, and a casting space is formed between the two.

Referring to Fig. 4, it shows an example of the structure of the support bar 7 used in this example. The support bar 7 is in a long strip structure as a whole, and its thickness is the same as the thickness of the encapsulation layer to be formed at the bottom of the lithium-ion battery 4. The length and width of the support bar 7 can be determined according to actual needs and are not limited here.

On this basis, in this exemplary solution, a plurality of guide grooves 71 are formed at the bottom of the support bar 7 so that the casting compound can flow and fill at the bottom of the lithium-ion battery 4 during casting.

Here, there is no limitation on the arrangement scheme of the guide groove 71 at the bottom of the support bar 7, such as size, shape, and distribution scheme, which can be determined according to actual needs. As an example, the illustrated scheme adopts a square groove structure that is equidistantly distributed perpendicular to the extension direction of the support bar 7.

The support bar 7 is made of insulating material during specific implementation.

When the support bar 7 thus formed cooperates with the fixing frame 6 , the fixing frame 6 with a groove at the bottom is installed at a set position in the battery box 8 .

Furthermore, a support bar 7 with a groove is installed in the fixing frame 6. The number of the support bars 7 can be determined according to the number of lithium-ion batteries 4 to be assembled.

As an example, an even number of support bars 7 are preferably divided into two groups and arranged side by side in the fixing frame 6, and the multiple support bars 7 in each group are arranged in sequence along the length direction (as shown in FIG. 1 ).

To ensure stability when the lithium-ion batteries 4 are subsequently arranged and placed, the support bar 7 is preferably fixed to a specified position in the fixing frame 6 by gluing with the groove facing downward, but is not limited to this fixed setting mode.

The fixing frame 6 thus arranged cooperates with the support bars 7 inside it to form a corresponding support assembly to place and support the lithium-ion battery 4 to be assembled. The placement position of the lithium-ion battery 4 to be assembled is fixed by the fixing frame 6, and the lithium-ion battery 4 to be assembled is supported by the support bars 7 at the bottom, so that the lithium-ion battery 4 to be assembled is arranged in the box body 8 in an overhead structure, so that the lithium-ion battery 4 to be assembled does not contact the bottom of the box body, and a casting space is formed between the two.

When the matching structure is cast, the injected casting compound can flow and fill the bottom of the lithium-ion battery 4 through the grooves at the bottom of the fixing frame 6 and the guide grooves 71 at the bottom of the support bar 7, thereby forming a casting layer of required thickness.

In this exemplary solution, a protective cover 2 is also provided for the safety valve on the lithium-ion battery 4, which is used to control the molding thickness of the corresponding encapsulation compound on the safety valve of the lithium-ion battery during the primary encapsulation, so as to ensure that the safety valve of the lithium-ion battery functions normally and can work normally.

The protective cover 2 is mounted on the safety valve of each lithium-ion battery 4 to form an openable protective cavity around the safety valve. In this way, during casting, the injected casting compound cannot flow through the safety valve due to the protection of the protective cavity, and can only form a corresponding casting layer outside the protective cavity. On this basis, the thickness of the casting layer formed outside the protective cavity is effectively controlled by the height of the protective cavity. In this way, when the safety valve is opened, the pressure in the protective cavity increases, and the protective cavity and the casting layer covering it can be effectively pushed open under the action of pressure, thereby ensuring the effect of safety protection without affecting the effectiveness of the safety valve at all.

Referring to Fig. 5, it shows an exemplary configuration of the protective cover 2 used in this exemplary configuration. The protective cover 2 is mainly composed of a cover body 21 and a cover cover 22.

The cover body 21 is of a hollow structure, which is communicated with each other from top to bottom. The bottom port is used to cover the safety valve, and the top port cooperates with the cover 22 to realize a detachable sealing structure.

The configuration of the cover body 21 is not limited here, and its shape and internal size can be set as needed, for example, it can be cylindrical, elliptical, square, etc. The height of the cover body 21 is determined according to the height after casting.

Taking the scheme shown in FIG. 5 as an example, the cover body 21 provided therein is a hollow cylindrical shape as a whole, and corresponding flange structures are provided at the two ports to facilitate the assembly, setting and fixing of the safety valve. At the same time, a corresponding countersunk hole structure is formed at the top port of the cover body 21 to accommodate the cover 22, so that the cover 22 can be embedded in the port of the cover body 21 as a whole. When the plugging is realized, the whole is flush with the end surface of the cover body 21, ensuring the reliability of the subsequent casting.

The cover 22 in this embodiment cooperates with the top port of the cover body 21 as a whole to achieve blocking of the port, forming a protective cavity in the cover body 21 to prevent the casting compound from flowing into the cover body 21 .

Here, the structure of the cover 22 is not limited and can be determined according to actual needs. Taking the scheme shown in FIG5 as an example, in conjunction with the structure of the cover body 21, the cover 22 in this exemplary scheme adopts a disc structure.

Based on the protective cover 2 formed by the cover body 21 and the cover cover 22 provided in this example solution, the cover body 21 is covered on the safety valve, and the upper part of the cover body 21 is blocked by the cover cover 22, so that the protective cover 2 is entirely covered on the upper part of the battery safety valve, and a protective cavity is formed around the safety valve.

When the casting is performed in this way, the injected casting compound cannot enter the cover body 21 due to the blocking of the cover 22, and a corresponding casting layer will be formed on the outside of the protective cover 2. The thickness of the formed casting layer can be adjusted by the height of the cover body 21. In this way, when the safety valve is opened, the pressure in the protection cavity increases, and the cover 22 on the top of the cover body 21 and the casting layer covering it can be effectively pushed open under the action of pressure, ensuring the effect of safety protection without affecting the efficiency of the safety valve at all.

When assembling the lithium-ion batteries 4 in this exemplary solution, the lithium-ion batteries 4 are placed in a fixing frame 6 and arranged on a supporting bar 7 (as shown in FIGS. 1 and 2 ).

On this basis, a separator 5 is inserted between adjacent lithium-ion batteries 4 so that adjacent lithium-ion batteries 4 are not in direct contact with each other, thereby achieving insulation and heat isolation between adjacent lithium-ion batteries 4 .

The partition 5 here is preferably a flat plate structure made of non-metallic material, and the length and width of the partition are matched with the corresponding lithium-ion battery 4 to achieve insulation and heat insulation between adjacent batteries.

After the plurality of lithium-ion batteries 4 in this exemplary solution are arranged and assembled in the fixing frame 6 of the box, the positive and negative electrodes of the lithium-ion batteries are further connected through the battery connecting sheet 3 to form a battery pack.

The structure of the battery connecting piece 3 is not limited and can be determined according to actual needs.

Meanwhile, the specific connection combination is not limited here and can be determined according to actual needs. For example, multiple lithium-ion batteries 4 can be connected in series or in parallel to form a battery pack.

In addition, the protective cover 2 of the safety valve on each lithium-ion battery 4 can be set before each lithium-ion battery 4 is assembled; if necessary, it can be set after all lithium-ion batteries 4 are assembled, which can be determined according to actual needs.

When the lithium-ion battery box provided in this example is actually used, the assembly of the lithium-ion battery box is completed according to the above-mentioned scheme before the encapsulation is performed.

After assembly, the prepared encapsulation compound can be directly injected into the box until the encapsulation surface reaches the specified height. In this way, the battery surface, live parts, and exposed metal parts are all encapsulated in the encapsulation compound by completing the encapsulation at one time.

After the encapsulation compound is solidified, the box cover 1 and the box body 8 are sealed and fixedly connected to form a final lithium-ion battery box.

As for the encapsulation compound, in this example solution, silicone encapsulation glue is preferably used, so that the battery can be unsealed after encapsulation, which is convenient for battery recycling.

The lithium-ion battery box solution given in this example installs a fixing frame with a groove on the bottom in the battery box, installs a battery support bar with a groove on the bottom in the fixing frame, and installs a protective cover on the upper part of the safety valve. It only takes one time to inject the encapsulation compound into the battery box to encapsulate all surfaces of the battery, live parts, exposed metal parts, etc. in the encapsulation compound, so that the encapsulation thickness of the lithium-ion battery meets the standard requirements. It not only meets the encapsulation requirements specified in the standard, simplifies the encapsulation process, and improves production efficiency, but also does not affect the opening of the safety valve.

Based on the aforementioned lithium-ion battery box solution, the following specifically describes the implementation plan for one-time sealing of lithium-ion batteries.

Before the formal encapsulation, materials are prepared based on the aforementioned battery box solution to form the corresponding box body 8, box cover 1, protective cover 2, battery connecting piece 3, partition 5, fixing frame 6, support bar 7 and lithium-ion battery 4 to be assembled and packaged.

Combining Figure 1 and Figure 2, the encapsulation process of the lithium-ion battery is as follows:

1) Place the battery holder 6 into the battery box 8 with the slotted side facing downward.

In this example solution, metal material is used, and the periphery of the fixing frame is spot welded at a specified position in the box body, and an epoxy resin plate is pasted on the inner surface of the fixing frame (the surface in contact with the battery) for insulation from the battery.

2) Paste the battery support bar 7 at a specified position in the fixing frame 6, and place the end with the casting compound guide groove downward.

Here, the length of the support bar is determined according to actual needs, and a plurality of battery support bars 7 are divided into two columns and arranged in parallel in the fixing frame 6. When the lithium-ion battery 4 is assembled, two support bars are provided at the bottom of each lithium-ion battery 4.

3) Place several lithium-ion batteries 4 on the support bars 7 in the fixing frame in sequence. Thus, the lithium-ion batteries 4 are arranged in the box body in an overhead manner, so that a casting space is formed between each lithium-ion battery 4 and the inner wall and bottom of the box body 8, and the size of the space here can be determined according to actual index requirements.

4) A separator 5 is inserted between adjacent lithium-ion batteries 4 to provide insulation and heat insulation between adjacent lithium-ion batteries 4 .

5) A corresponding protective cover 2 is mounted on the safety valve of each lithium-ion battery 4 .

Here, the flat bottom surface of the safety valve protective cover 2 is pasted on the upper part of the safety valve, and the cover is covered to form a protective cavity around the safety valve.

6) According to design requirements, multiple lithium-ion batteries 4 are connected (such as in series or in parallel) through battery connecting sheets 3 to form a battery pack.

7) The encapsulation compound is injected into the battery box. The encapsulation compound flows in through the gaps between the batteries and between the batteries and the box body. At the same time, it flows from the slots or guide grooves at the bottom of the fixing frame and the support bar to fill the bottom of the battery. As a result, the encapsulation compound is automatically filled through the gaps between the batteries, the gaps between the batteries and the box body, the fixing frame, the slots of the support bar, etc. As the amount of encapsulation compound injected increases, the liquid level rises from bottom to top until it covers the battery pole connector and the protective cover. When the specified height is reached, the injection of encapsulation compound is stopped.

8) After the encapsulation compound is cured and formed, the box cover 1 is connected to the box body 8 by connecting bolts, and the box body 8 is sealed to obtain the final lithium-ion battery box (as shown in FIG. 6 ).

In this way, the battery can be encapsulated in one go, and the battery surface, live parts, and exposed metal parts are all encapsulated in the encapsulation compound. There is no need for any secondary or multiple encapsulations. The encapsulation thickness of the lithium-ion battery can meet the standard requirements through one encapsulation, simplifying the encapsulation process and improving production efficiency.

Referring to FIG. 7 , it is a diagram showing the effect of one-time encapsulation of 10 lithium-ion batteries based on the one-time encapsulation method for lithium-ion batteries.

Referring to FIG. 8 , it is a diagram showing the effect of one-time encapsulation of 50 lithium-ion batteries based on the one-time encapsulation method for lithium-ion batteries.

It can be seen that based on the lithium-ion battery encapsulation scheme provided by the present invention, the battery and its accessory components can be completely encapsulated in the compound by one encapsulation, so that multiple indicators such as the encapsulation thickness of different parts of the battery and the insulation from the battery box meet the standard requirements, simplify the encapsulation process, and improve the encapsulation quality and efficiency. It is of great significance for large-scale lithium-ion battery power sources (containing dozens to hundreds of single lithium-ion batteries) and has broad application prospects.

The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims (10)

1. A lithium ion battery component, which is characterized by comprising a box body, a supporting component, at least one lithium ion battery, a protective cover and a casting compound;

the lithium ion battery box comprises a box body, a supporting assembly, a fixing frame, a supporting bar, a supporting assembly and a pouring space, wherein the supporting assembly is arranged in the box body to form a lithium ion battery placing area, the supporting assembly can form an overhead structure placing area in the box body, the fixing frame is matched with the supporting bar to form a corresponding placing area, the lithium ion battery to be assembled is placed to fix the placing position of the lithium ion battery, an insulating layer covers the surface contacted with the battery, and the corresponding supporting bar is arranged in the placing area formed by the fixing frame and is used for supporting the lithium ion battery to be assembled, so that the lithium ion battery to be assembled is not contacted with the bottom of the box body, and the pouring space is formed between the supporting bar and the fixing frame;

the at least one lithium ion battery is arranged in an arranging area formed by the supporting component, and a pouring space is formed between the at least one lithium ion battery, the inner side wall of the box body and the bottom;

the protective cover is arranged on a safety valve of the lithium ion battery;

The casting compound is injected into the box body at one time, gaps among the battery, the box body and the battery are filled, the casting body is formed at one time, and the casting body formed at one time covers the whole outer surface of the lithium ion battery.

2. The lithium ion battery module according to claim 1, wherein the protective cover comprises a cover body and a cover plate, the cover body is of a through hole structure and can be covered on a safety valve of the lithium ion battery, and the cover plate is detachably arranged on the cover body.

3. The lithium ion battery module of claim 1, wherein the one-shot molded potting body also covers charged sites on the lithium ion battery, bare metal pieces.

4. The lithium ion battery module of claim 1, wherein the support assembly is entirely of an insulating structure.

5. The lithium ion battery module of claim 1, wherein a separator is disposed between adjacent lithium ion batteries.

6. The lithium ion battery module of claim 1, wherein the potting compound is injected into a housing in which at least one lithium ion battery is disposed at a time.

7. A lithium ion battery potting method, characterized in that the potting method comprises:

At least one lithium ion battery is arranged in the box body in an overhead manner through the supporting component, and a pouring space is formed between the lithium ion battery and the inner side wall and the bottom of the box body; the supporting component can form a placement area of an overhead structure in the box body, the placement area is formed by matching a fixing frame with supporting bars, the fixing frame forms a corresponding placement area for placing a lithium ion battery to be assembled so as to fix the placement position of the lithium ion battery, an insulating layer covers the surface contacted with the battery, and the corresponding supporting bars are arranged in the placement area formed by the fixing frame and used for supporting the lithium ion battery to be assembled so that the lithium ion battery to be assembled is not contacted with the bottom of the box body, and a pouring space is formed between the lithium ion battery to be assembled and the bottom of the box body;

a protective cover is arranged on a safety valve of each lithium ion battery, and an openable protective cavity is formed for the safety valve;

Pouring the sealing compound into the box body at one time, and filling gaps among the batteries, the box body and the batteries until the sealing cover reaches a specified height.

8. The lithium ion battery potting method of claim 7, wherein the potting method provides a separator between adjacent lithium ion batteries.

9. The lithium ion battery potting method of claim 7, wherein the potting method encapsulates all of the battery surface, charged sites, bare metal pieces within the potting compound by one-time potting.

10. The lithium ion battery potting method of claim 7, wherein the potting compound is a silicone potting compound.