CN218039499U - Battery with a battery cell - Google Patents

Abstract

The utility model relates to the technical field of batteries, and proposes a battery, comprising: a first casing part; a second casing part; a metal coating, the metal coating is located between the first casing part and the second casing part, And respectively welded with the first housing part and the second housing part; wherein, the melting point of the metal coating is lower than the melting point of the first housing part, the melting point of the metal coating is lower than the melting point of the second housing part, and the metal coating The corrosion rate is less than that of the first housing member and the second housing member. The connection stability of the first shell part and the second shell part is ensured by welding the metal coating to both the first shell part and the second shell part, and the corrosion rate of the metal coating is lower than that of the first shell The body part and the second shell part, so as to realize the anti-corrosion protection of the joint position of the first shell part and the second shell part, thereby reducing the risk of corrosion of the first shell part and the second shell part, In this way, the safe use performance of the battery is improved.

Description

Battery

technical field

The utility model relates to the technical field of batteries, in particular to a battery.

Background technique

Most of the battery casings in the related art are metal casings, which are prone to corrosion, and it is especially difficult to carry out anti-corrosion treatment at the joints of the casings, so the risk of corrosion is more likely to occur.

Utility model content

The utility model provides a battery to improve the service performance of the battery.

The utility model provides a battery, comprising:

a first housing member;

second housing member;

a metal coating, the metal coating is located between the first shell part and the second shell part, and is welded to the first shell part and the second shell part respectively;

Wherein, the melting point of the metal coating is lower than the melting point of the first housing part, the melting point of the metal coating is lower than the melting point of the second housing part, and the corrosion rate of the metal coating is lower than that of the first housing part and the second housing part.

The battery in the embodiment of the present invention includes a first casing part, a second casing part and a metal coating, and the metal coating is connected between the first casing part and the second casing part. By welding the metal coating to both the first shell part and the second shell part, the connection stability of the first shell part and the second shell part is ensured, and the first shell part and the second shell part The melting point of the parts is higher than the melting point of the metal coating, so the melting of the metal coating can be facilitated, and the reliable welding of the metal coating with the first shell part and the second shell part can be ensured, and the corrosion rate of the metal coating is lower than that of the first shell The body part and the second shell part, so as to realize the anti-corrosion protection of the joint position of the first shell part and the second shell part, thereby reducing the risk of corrosion of the first shell part and the second shell part, In this way, the safe use performance of the battery is improved.

Description of drawings

For a better understanding of the present disclosure, reference may be made to the embodiments illustrated in the following figures. Components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, related elements or components may be arranged differently as known in the art. In addition, in the drawings, the same reference numerals denote the same or similar components in the respective drawings. in:

Fig. 1 is a schematic structural view of a battery according to an exemplary embodiment;

Fig. 2 is a partial cross-sectional structural schematic diagram of a battery according to an exemplary embodiment;

Fig. 3 is a partially enlarged structural schematic diagram of a battery according to an exemplary embodiment;

Fig. 4 is a partially enlarged structural schematic diagram of a first case part and a second case part of a battery according to an exemplary embodiment;

Fig. 5 is a partially enlarged schematic structural view of a battery according to another exemplary embodiment;

Fig. 6 is a partially enlarged structural schematic diagram of a first casing part and a second casing part of a battery according to another exemplary embodiment.

The reference signs are explained as follows:

10. The first shell part; 11. The installation groove; 111. The bottom wall; 112. The side wall; 20. The second shell part; 30. The metal coating.

detailed description

The following will clearly and completely describe the technical solutions in the exemplary embodiments of the present disclosure with reference to the accompanying drawings in the exemplary embodiments of the present disclosure. The exemplary embodiments described herein are for illustrative purposes only, and are not intended to limit the protection scope of the present disclosure, so it should be understood that various modifications can be made to the exemplary embodiments without departing from the protection scope of the present disclosure. modifications and changes.

In the description of the present disclosure, unless otherwise clearly specified and limited, the terms "first" and "second" are only used for the purpose of description, and cannot be understood as indicating or implying relative importance; the term "plurality" is means two or more; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, references to "the" or "an" are likewise intended to mean one of a possible plurality of such objects.

Unless otherwise specified or explained, the terms "connected" and "fixed" should be interpreted in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or integral connection, or electrical connection, or Connection; "connection" can be a direct connection or an indirect connection through an intermediary. Those skilled in the art can understand the specific meanings of the above terms in the present disclosure according to specific situations.

Furthermore, in the description of the present disclosure, it should be understood that the orientation words such as "upper", "lower", "inner" and "outer" described in the exemplary embodiments of the present disclosure are based on the angles shown in the drawings It should not be construed as limiting the example embodiments of the present disclosure. It also needs to be understood that in this context, when an element or feature is referred to as being "on," "under," or "inside" or "outside" another element(s), it is not only a direct connection In other (one or more) elements "on", "under" or "inside", "outside", it can also be indirectly connected to another (one or more) elements "on", "under" or "outside" through intermediate elements inside and outside".

An embodiment of the present utility model provides a battery, please refer to FIG. 1 to FIG. 6, the battery includes: a first casing part 10; a second casing part 20; a metal coating 30, the metal coating 30 is located on the first Between the shell part 10 and the second shell part 20, and welded with the first shell part 10 and the second shell part 20 respectively; wherein, the melting point of the metal coating 30 is lower than the melting point of the first shell part 10, The melting point of the metal coating 30 is less than the melting point of the second housing piece 20 , and the corrosion rate of the metal coating 30 is less than that of the first housing piece 10 and the second housing piece 20 .

The battery in one embodiment of the present invention includes a first casing part 10 , a second casing part 20 and a metal coating 30 , and the metal coating 30 is connected between the first casing part 10 and the second casing part 20 . By welding the metal coating 30 to both the first housing part 10 and the second housing part 20, the connection stability of the first housing part 10 and the second housing part 20 is ensured, and the first housing part 10 and the melting point of the second casing part 20 are higher than the melting point of the metal coating 30, so the melting of the metal coating 30 can be facilitated, and the reliable welding of the metal coating 30 and the first casing part 10 and the second casing part 20 can be ensured , and the corrosion rate of the metal coating 30 is less than that of the first housing part 10 and the second housing part 20, so as to realize the anti-corrosion protection at the joint position of the first housing part 10 and the second housing part 20, thereby The risk of corrosion of the first casing part 10 and the second casing part 20 is reduced, thereby improving the safe use performance of the battery.

It should be noted that the first shell part 10 and the second shell part 20 can be two independent parts, and the first shell part 10 and the second shell part 20 are connected by welding after being butted, and by A metal coating 30 is provided between the first housing part 10 and the second housing part 20, and the melting point of the metal coating 30 is lower than the melting point of the first housing part 10 and the second housing part 20, so in the opposite When the first shell part 10 and the second shell part 20 are welded, the metal coating 30 can be effectively melted, so as to form a connection with the first shell part 10 and the second shell part 20, so that it can be effectively formed on At the connection position between the first shell part 10 and the second shell part 20, the corrosion rate of the metal coating 30 is lower than the corrosion rate of the first shell part 10, and the corrosion rate of the metal coating 30 is lower than that of the second shell The corrosion rate of the part 20, the metal coating 30 is an anti-corrosion coating, therefore, the metal coating 30 can further protect the first shell on the basis of realizing the connection with the first shell part 10 and the second shell part 20 The connecting position of the first housing part 10 and the second housing part 20, thereby reducing the risk of corrosion at the connecting position of the first housing part 10 and the second housing part 20.

The corrosion rate of the metal coating 30 is lower than that of the first housing part 10 and the second housing part 20, and the corrosion resistance of the metal coating 30 is greater than that of the first housing part 10, and the corrosion resistance of the metal coating 30 is greater than that of the first housing part 10. The capacity is greater than the corrosion protection capacity of the second housing member 20 . That is, per unit time, the weight lost by the metal coating 30 per unit area is less than the weight lost by the first housing part 10 , and the weight lost by the metal coating 30 is less than the weight lost by the second housing part 20 .

In some embodiments, it is not excluded that the first housing part 10 and the second housing part 20 may be an integral structure, the first housing part 10 and the second housing part 20 are integrally formed, and the second housing part 10 may be realized by welding subsequently. The connection position of the first housing part 10 and the second housing part 20 is provided with a metal coating 30 .

In one embodiment, the melting point of the metal coating 30 is 150°C-800°C, so that the melting point of the metal coating 30 is lower than the melting points of the first housing part 10 and the second housing part 20, thereby ensuring that the metal coating 30 can be effectively melted, so as to ensure the welding quality of the first shell part 10 and the second shell part 20 .

The melting point of the metal coating 30 is too low, which may cause the metal coating 30 to melt prematurely, and the fluid formed by the metal coating 30 is difficult to control, so it flows to other places, affecting not only the first housing part 10 and the second housing part 20 welding quality, and may affect other positions. However, if the melting point of the metal coating 30 is too high, the metal coating 30 will be melted too late, which will affect the welding quality of the first housing part 10 and the second housing part 20. In this embodiment, by coating the metal The melting point of the layer 30 is controlled at 150° C. to 800° C., which can effectively ensure the welding quality of the first casing part 10 and the second casing part 20 .

The melting point of the metal coating 30 can be 150°C, 160°C, 170°C, 175°C, 200°C, 210°C, 230°C, 250°C, 260°C, 270°C, 275°C, 280°C, 290°C, 300°C, 310°C, 330°C, 350°C, 360°C, 370°C, 375°C, 380°C, 390°C, 400°C, 410°C, 430°C, 450°C, 460°C, 470°C, 475°C, 480°C, 490°C , 500°C, 510°C, 530°C, 550°C, 560°C, 570°C, 575°C, 580°C, 590°C, 600°C, 610°C, 630°C, 650°C, 660°C, 670°C, 675°C, 680°C ℃, 690℃, 700℃, 710℃, 730℃, 750℃, 760℃, 770℃, 775℃, 780℃, 785℃, 790℃, 795℃ or 800℃, etc.

In one embodiment, the thickness of the metal coating 30 is 1 μm-500 μm, and the metal coating 30 can also be avoided on the basis of ensuring that the metal coating 30 can reliably protect the first casing part 10 and the second casing part 20 If it is too thick, there will be an overflow problem, which will affect the welding quality of the battery.

If the thickness of the metal coating 30 is too small, it will not be able to form an effective connection with the first housing part 10 and the second housing part 20, and the protective effect will be relatively poor, and if the thickness of the metal coating 30 is too large, it will not only be inconvenient The setting of the metal coating 30, and when welding, the metal coating 30 may have an overflow problem, thereby affecting the quality of the inside or outside of the first housing part 10 and the second housing part 20, and the metal coating 30 It is not easy to remove when it overflows into the first housing part 10 and the second housing part 20 , and may affect the internal structure of the first housing part 10 and the second housing part 20 .

The thickness of the metal coating 30 can be 1 μm, 2 μm, 3 μm, 5 μm, 10 μm, 20 μm, 30 μm, 50 μm, 100 μm, 120 μm, 150 μm, 180 μm, 200 μm, 250 μm, 260 μm, 270 μm, 300 μm, 310 μm, 320 μm, 350 μm, 380 μm, 400μm, 410μm, 420μm, 430μm, 450μm, 480μm, 490μm, 495μm or 500μm, etc.

In one embodiment, the metal coating 30 is an anti-corrosion coating. The anti-corrosion coating may refer to a corrosion-resistant structure against the electrolyte. The metal coating 30 may include tin, lead or silver, or the metal coating 30 may include An alloy formed of tin, lead, silver, and copper, for example, the metal coating 30 may be a tin-copper alloy, and the metal coating 30 may be a tin-silver-copper alloy, etc., which are not limited herein.

In one embodiment, the metal coating 30 is solder paste, and the solder paste can not only achieve reliable welding with the first housing part 10 and the second housing part 20, but also realize the connection between the first housing part 10 and the second housing part 10. The anti-corrosion protection of the housing part 20, so as to ensure the safe use performance of the first housing part 10 and the second housing part 20, and the first housing part 10 and the second housing part 10 can be easily realized due to the existence of solder paste Solder connection of piece 20.

Solder paste is arranged between the first housing part 10 and the second housing part 20, and when the first housing part 10 and the second housing part 20 are welded, the solder paste melts and is combined with the first housing part 10 and the second housing part 10 and the second housing part 20. The body part 20 forms a reliable connection, and can form a dense anti-corrosion layer after the solder paste is solidified, thereby improving the overall corrosion resistance of the first housing part 10 and the second housing part 20 .

In one embodiment, the first housing part 10 includes steel, and the second housing part 20 includes steel, that is, the first housing part 10 and the second housing part 20 made of steel are relatively prone to corrosion, so , by providing the metal coating 30 between the first casing part 10 and the second casing part 20, the steel material can be effectively prevented from being severely corroded, thereby improving the safety performance of the battery.

The first housing part 10 and the second housing part 20 made of steel can be welded by solder paste, and the solder paste can form a dense anti-corrosion layer after welding, so as to protect the first housing part 10 and the second housing part 10. The effect of the casing part 20 is to effectively avoid the corrosion problem of the first casing part 10 and the second casing part 20 .

In one embodiment, the first housing part 10 may be formed with a first receiving chamber, and the second housing part 20 may be formed with a second receiving chamber. After the first housing part 10 and the second housing part 20 are connected, The first accommodation cavity and the second accommodation cavity can form an accommodation space for accommodating the electric core.

In one embodiment, the first housing part 10 is a cover plate, that is, the second housing part 20 is formed with an accommodating space for the electric core. By setting the first housing part 10 as a cover plate, not only the structure is simple, but also the forming, and can facilitate the connection between the first casing part 10 and the second casing part 20, thereby improving the manufacturing efficiency of the battery.

In one embodiment, as shown in FIG. 3 to FIG. 6 , the first shell member 10 is provided with a mounting groove 11, and at least part of the metal coating 30 is located in the mounting groove 11, so as to be compatible with the first shell member 10 and the first shell member 10. The second housing part 20 is welded. By forming the installation groove 11 on the first shell member 10, the setting of the metal coating 30 can be facilitated, that is, the metal coating 30 can be reliably arranged in the installation groove 11, which not only facilitates the operation, but also ensures that the metal The coating 30 is arranged at a relatively fixed position, so that the metal coating 30 can reliably connect the first housing part 10 and the second housing part 10 and the second housing part 20 when welding the first housing part 10 and the second housing part 20 subsequently. The shell part 20, and can ensure that the metal coating 30 is welded at a relatively fixed position, so as to ensure the effective protection of the metal coating 30 to the first shell part 10 and the second shell part 20, and lower the first shell The risk of corrosion at the junction of the body part 10 and the second housing part 20 .

Taking solder paste as an example for the metal coating 30, the solder paste can be placed in the installation groove 11, and then the first shell part 10 and the second shell part 20 are butted together, and the first shell part 10 and the second shell are welded together. The body part 20 melts the solder paste, and the melted solder paste is located in the installation groove 11 and forms a reliable connection with the first case part 10 and the second case part 20, thereby ensuring that the first case part 10 and the second case part The fixed connection of the shell part 20 can make the solder paste form a dense anti-corrosion layer, so as to achieve the effect of protecting the first shell part 10 and the second shell part 20, and effectively prevent the first shell part 10 and the second shell The body 20 suffers from corrosion problems.

In one embodiment, as shown in FIG. 3 and FIG. 4 , the mounting groove 11 includes a bottom wall 111 and a side wall 112 , the side wall 112 is arranged around one end of the bottom wall 111 , and the other end of the bottom wall 111 is connected to the first housing member. The circumferential outer surfaces of 10 intersect, that is, the installation groove 11 may only include a bottom wall 111 and a side wall 112, so that the installation groove 11 forms a non-circumferentially closed structure, which not only facilitates the forming of the installation groove 11, but also facilitates Forming the first shell part 10 and the second shell part 20 into butt joints accurately will not lead to the problem of structural unusability due to relatively small errors.

In one embodiment, the metal coating 30 covers at least part of the bottom wall 111, that is, there may be a metal coating 30 between the end faces of the first housing part 10 and the second housing part 20, and the metal coating 30 is realized by welding. Reliable connection with the first housing part 10 and the second housing part 20 , and can reliably protect the first housing part 10 and the second housing part 20 .

In one embodiment, the metal coating 30 covers at least part of the side wall 112. At this time, there may be a metal coating 30 between the sides of the first housing part 10 and the second housing part 20, and the metal coating 30 is realized by welding. The layer 30 is reliably connected to the first housing part 10 and the second housing part 20 and can reliably protect the first housing part 10 and the second housing part 20 .

In one embodiment, as shown in FIG. 3 , the metal coating 30 covers the bottom wall 111 and the side wall 112 at the same time, so as to form a reliable protection for the first housing part 10 and the second housing part 20, and also can The connection stability of the first housing part 10 and the second housing part 20 is improved.

In one embodiment, as shown in FIG. 5 and FIG. 6 , the mounting groove 11 includes a bottom wall 111 and two opposite side walls 112, and the two opposite side walls 112 are arranged around opposite ends of the bottom wall 111 respectively, so that The mounting groove 11 can form a circumferentially closed structure, so that the metal coating 30 can be reliably accommodated in the mounting groove 11, so as to ensure that the metal coating 30 can be connected with the first housing part 10 and the second housing part 20 forms a reliable connection, thereby effectively protecting the first housing part 10 and the second housing part 20 .

The metal coating 30 can cover at least one of the bottom wall 111 and the two side walls 112 , so as to achieve corrosion protection for the first housing part 10 and the second housing part 20 . As shown in FIG. 5 , the metal coating 30 can cover the bottom wall 111 and the two side walls 112 at the same time.

It should be noted that Fig. 3 and Fig. 5 are only used to show that the metal coating 30 is provided between the first housing part 10 and the second housing part 20, further, it is used to show that the metal coating 30 can be located in the installation groove 11, and does not limit the specific structural form of the metal coating 30.

In one embodiment, as shown in FIG. 3 to FIG. 6 , a part of the second housing part 20 is located in the installation groove 11, so that the first housing part 10 and the second housing part 20 can be conveniently installed during the installation process. Positioning, so as to improve the assembly efficiency of the first housing part 10 and the second housing part 20, can enable the first housing part 10 and the second housing part 20 to form a reliable connection with the metal coating 30, thereby Improve the connection stability of the first housing part 10 and the second housing part 20, and make the contact area between the metal coating 30 and the first housing part 10 and the second housing part 20 relatively large, thereby improving The protective effect of the metal coating 30 on the first housing part 10 and the second housing part 20 .

In one embodiment, the battery further includes battery cells, and the battery cells are located in the first casing part 10 and the second casing part 20 .

It should be understood that a battery includes a battery cell and an electrolyte, the smallest unit capable of electrochemical reactions such as charging/discharging. The battery core refers to a unit formed by winding or laminating a stacked part, and the stacked part includes a first pole piece, a separator, and a second pole piece. When the first pole piece is a positive pole piece, the second pole piece is a negative pole piece. Wherein, the polarities of the first pole piece and the second pole piece can be interchanged. The first pole piece and the second pole piece are coated with active material.

The cell may include a cell main body and a tab part, the cell main body includes a positive electrode sheet and a negative electrode sheet, and the tab part includes a positive electrode tab and a negative electrode tab. The opposite ends of the battery cell are respectively provided with two pole lugs, and the battery may further include two pole assemblies, and the two pole lugs may be respectively connected with the two pole assemblies. Alternatively, the pool can also include a pole assembly, and one of the two lugs can be connected to the pole assembly, and the other can be connected to one of the first housing part 10 and the second housing part 20 .

In one embodiment, the battery may be a prismatic battery.

The battery can be a stacked battery, which is not only convenient for grouping, but also can be processed to obtain a battery with a long length. Specifically, the electric core is a laminated electric core, and the electric core has a first pole piece stacked on each other, a second pole piece electrically opposite to the first pole piece, and a pole piece arranged between the first pole piece and the second pole piece. The separator sheet, so that multiple pairs of the first pole piece and the second pole piece are stacked to form a laminated battery cell.

Alternatively, the battery can be a wound battery, that is, the first pole piece, the second pole piece electrically opposite to the first pole piece, and the diaphragm sheet arranged between the first pole piece and the second pole piece are wound, Obtain a coiled battery.

In one embodiment, the battery may be a cylindrical battery. The battery can be a winding battery, that is, the first pole piece, the second pole piece electrically opposite to the first pole piece, and the diaphragm sheet arranged between the first pole piece and the second pole piece are wound to obtain a rolled battery. Winding core.

An embodiment of the present invention also provides a battery pack, including the above-mentioned battery.

The battery pack of one embodiment of the present invention includes a battery, and the battery includes a first casing part 10, a second casing part 20 and a metal coating 30, and a connection between the first casing part 10 and the second casing part 20 Metallic coating30. By welding the metal coating 30 to both the first housing part 10 and the second housing part 20, the connection stability of the first housing part 10 and the second housing part 20 is ensured, and the first housing part 10 and the melting point of the second casing part 20 are higher than the melting point of the metal coating 30, so the melting of the metal coating 30 can be facilitated, and the reliable welding of the metal coating 30 and the first casing part 10 and the second casing part 20 can be ensured , and the corrosion rate of the metal coating 30 is less than that of the first housing part 10 and the second housing part 20, so as to realize the anti-corrosion protection at the joint position of the first housing part 10 and the second housing part 20, thereby The risk of corrosion of the first casing part 10 and the second casing part 20 is reduced, thereby improving the safe use performance of the battery pack.

In one embodiment, the battery pack is a battery module or a battery pack.

The battery module includes a plurality of batteries, which may be square batteries, and the battery module may also include end plates and side plates, which are used to fix the plurality of batteries. The battery can be a cylindrical battery, and the battery module can also include a bracket, and the battery can be fixed on the bracket.

The battery pack includes a plurality of batteries and a case body, and the case body is used to fix the plurality of batteries.

It should be noted that the battery pack includes batteries, and there may be multiple batteries, and the multiple batteries are arranged in the case. Wherein, a plurality of batteries can be installed in the casing after forming a battery module. Alternatively, a plurality of batteries can be directly arranged in the case, that is, it is not necessary to group the plurality of batteries, and the case is used to fix the plurality of batteries.

Other embodiments of the present disclosure will be readily apparent to those skilled in the art from consideration of the specification and practice of the utility model innovation disclosed herein. This disclosure is intended to cover any modification, use or adaptation of the present utility model, and these modifications, uses or adaptations follow the general principles of this disclosure and include common knowledge or conventional techniques in the technical field not disclosed in this disclosure means. The specification and example embodiments are to be considered as exemplary only, with the true scope and spirit of the disclosure indicated by the appended claims.

It should be understood that the present disclosure is not limited to the precise constructions which have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of protection of the present disclosure is limited only by the appended claims.

Claims (10)

1. A battery, comprising:

a first housing piece (10);

a second housing part (20);

a metal coating (30), the metal coating (30) being located between the first and second housing pieces (10, 20) and being welded to the first and second housing pieces (10, 20), respectively;

wherein the melting point of the metal coating (30) is lower than the melting point of the first housing part (10), the melting point of the metal coating (30) is lower than the melting point of the second housing part (20), and the corrosion rate of the metal coating (30) is lower than the first and second housing parts (10, 20).

2. The cell of claim 1, wherein the metal coating (30) has a melting point of 150 ℃ to 800 ℃.

3. The battery according to claim 1, characterized in that the thickness of the metal coating (30) is 1-500 μ ι η.

4. A battery according to any of claims 1 to 3, characterized in that the metal coating (30) is solder paste.

5. A battery according to any of claims 1 to 3, characterized in that the first housing piece (10) comprises steel and the second housing piece (20) comprises steel.

6. The battery according to claim 5, wherein the first housing member (10) is a cover plate.

7. A battery according to any of claims 1 to 3, characterized in that the first housing piece (10) is provided with a mounting groove (11) thereon, at least part of the metal coating (30) being located within the mounting groove (11) for welding with the first and second housing pieces (10, 20).

8. The battery according to claim 7, wherein the mounting groove (11) includes a bottom wall (111) and a side wall (112), the side wall (112) being disposed around one end of the bottom wall (111), the other end of the bottom wall (111) intersecting with a circumferential outer surface of the first case member (10);

wherein the metal coating (30) covers at least part of the bottom wall (111) and/or the metal coating (30) covers at least part of the side wall (112).

9. The battery according to claim 8, wherein a portion of the second housing member (20) is located within the mounting groove (11).

10. The battery according to any one of claims 1 to 3, wherein the battery is a cylindrical battery.

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