CN219717030U - Battery monomer, battery and electric equipment - Google Patents

Abstract

The utility model relates to a battery monomer, a battery and electric equipment. The battery cell includes: a housing for accommodating the electrolyte; and the battery cell component is accommodated in the shell; wherein, the inner wall of shell covers and has a inoxidizing coating, and the inoxidizing coating is used for keeping apart electrolyte and shell. Therefore, the battery monomer is covered with the protective layer on the inner wall of the shell, so that the shell is isolated from electrolyte in the shell by the protective layer, corrosion of the electrolyte in the shell to the shell is avoided, the good sealing performance of the shell is ensured, and the safety of the battery is improved.

Description

Battery monomer, battery and electric equipment

Technical Field

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

Background

With the continuous development of new energy automobile markets, the power battery industry rapidly expands and grows, the lithium battery technology is increasingly refined, and higher requirements are put on the safety performance of battery monomers.

At present, for the single cylindrical battery, electrolyte is injected into the single cylindrical battery shell, and in the use and storage processes of the battery, the electrolyte can corrode the shell to different degrees, so that the sealing performance of the shell is adversely affected, and the safety of the battery is further reduced.

Disclosure of Invention

Based on this, it is necessary to provide a battery cell, a battery and electric equipment for improving the above-mentioned defects, aiming at the problems that in the prior art, during the use and storage of the battery, the electrolyte can corrode the housing to different degrees and cause adverse effects on the sealability of the housing.

A battery cell comprising:

a housing for accommodating the electrolyte; a kind of electronic device with high-pressure air-conditioning system

The battery cell assembly is accommodated in the shell;

wherein, the inner wall of shell covers and has a inoxidizing coating, the inoxidizing coating is used for keeping apart electrolyte and the shell.

In one embodiment, the protective layer may be one or more of a nickel plating layer, a zinc plating layer, a chromium plating layer, and a titanium plating layer.

In one embodiment, the housing comprises a shell and a cover plate;

the battery cell assembly and the electrolyte are contained in the shell, the shell is provided with an opening, and the cover plate is used for closing the opening;

wherein the protective layer covers the entire inner side wall of the housing.

In one embodiment, the ratio of the thickness of the protective layer to the thickness of the shell is between 0.1 and 0.2.

In one embodiment, the cover plate is welded to the housing;

the outer side wall of the shell is provided with a welding assisting layer, and the welding assisting layer is at least partially positioned in a welding area where the shell and the cover plate are welded.

In one embodiment, the weld overlay has a melting point that is lower than the melting point of the housing.

In one embodiment, the housing has an annular end surface disposed around the opening, the annular end surface connecting an inner wall and an outer wall of the housing;

the cover plate is welded with the annular end face, and the welding assisting layer at least covers one end of the shell, which is provided with the opening.

In one embodiment, one end of the shell with the opening extends inwards to form an annular flanging part, and the cover plate is attached to the inner side surface of the annular flanging part and welded; the welding assisting layer at least covers the outer side surface of the annular flanging part.

In one embodiment, the ratio of the protective layer to the soldering-assist layer is between 1/3 and 3/4.

A battery comprising a battery cell as described in any one of the embodiments above.

A powered device comprising a battery as in any one of the embodiments above.

Above-mentioned battery monomer, battery and consumer through the inner wall cover inoxidizing coating at the shell to utilize this inoxidizing coating to keep apart the electrolyte in shell and the shell, and then avoid the inside electrolyte of shell to lead to the fact the corruption to the shell, thereby ensure the leakproofness preferred of shell, improve the security of battery.

Drawings

Fig. 1 is a schematic structural diagram of a battery cell according to an embodiment of the utility model;

fig. 2 is a cross-sectional view of the battery cell shown in fig. 1 (with the cell assembly and electrode terminals omitted);

FIG. 3 is an enlarged view of a portion of the weld between the housing and the cover of the battery cell shown in FIG. 2;

fig. 4 is a partial enlarged view of a welded portion between a case and a cap plate of a battery cell according to another embodiment;

fig. 5 is a partial enlarged view of a welded portion of a case and a cap plate of a battery cell according to still another embodiment.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Referring to fig. 1 to 3, the present utility model provides a battery cell 100, which includes a housing 10 and a battery cell assembly (not shown). The case 10 accommodates an electrolyte. The cell assembly is accommodated in the housing 10, so that the electrolyte infiltrates into the interior of the cell assembly. Wherein, the inner wall of the casing 10 is covered with a protective layer 40 (see fig. 3), and the protective layer 40 is used for isolating the electrolyte inside the casing 10 from the casing 10.

In this way, the battery unit 100 of the present utility model covers the protective layer 40 on the inner wall of the casing 10, so that the protective layer 40 is used to isolate the casing 10 from the electrolyte inside the casing 10, thereby avoiding the corrosion of the electrolyte inside the casing 10 to the casing 10, ensuring better sealing performance of the casing 10 and improving the safety of the battery.

In one embodiment, the housing 10 has a fill port (not shown) from which electrolyte is injected into the housing 10. The battery cell 100 further includes a sealing member (not shown) that seals the filling hole so as to prevent the electrolyte in the case 10 from leaking out of the filling hole. Alternatively, the seal may be a seal pin.

In an embodiment of the present utility model, the housing 10 includes a shell 11 and a cover 12. The above-mentioned cell assembly and the electrolyte are accommodated inside the case 11. The housing 11 has an opening 111, and the cover 12 is used to close the opening 111 of the housing 11. The protective layer 40 covers the entire inner side wall of the housing 11, thereby isolating the housing 11 from the electrolyte therein and preventing the electrolyte from corroding the housing 11. Referring to fig. 2, the inner side wall of the housing 11 herein refers to a cylindrical portion of the inner side surface of the housing 11. Similarly, the outer side wall of the housing 11 herein refers to a cylindrical portion of the outer side surface of the housing 11.

Optionally, the cell assembly has a first tab (not shown) and a second tab (not shown) of opposite polarity to each other. The cover plate 12 is used for being electrically connected with the first tab of the battery cell assembly. The battery cell 100 further includes an electrode terminal 60, and the electrode terminal 60 is insulated from the case 11. The electrode terminal 60 is for electrical connection with a second tab of the cell assembly. Thus, the first tab of the battery cell assembly is electrically connected to the cap plate 12, and the second tab of the battery cell assembly is electrically connected to the electrode terminal 60, so that the first tab, the cap plate 12 and the housing 11 form a conductive path, and the second tab and the electrode terminal 60 form another conductive path to output electric energy. It can be appreciated that the electrode terminals 60 are insulated from the case 11, thereby avoiding the short circuit of the battery cell 100.

Note that, the method of outputting electric power is not limited to the method of using the electrode terminal 60 and the cap plate 12 or the case 11 as the positive electrode and the negative electrode, respectively, and in other embodiments, the positive electrode terminal and the negative electrode terminal may be used as the positive electrode and the negative electrode, respectively, so long as the output of electric power can be achieved, and the method is not limited herein.

It is understood that the cell assembly is a component of the battery cell 100 where electrochemical reaction occurs, and the cell assembly may include a positive electrode tab, a negative electrode tab, and a separator. The battery cell assembly can be a winding structure formed by winding a positive electrode plate, a negative electrode plate and a separation film. The cell assembly may also be a laminated structure formed by laminating the positive electrode sheet, the negative electrode sheet and the separator. The positive electrode plate comprises a positive electrode current collector and positive electrode active material layers coated on two opposite sides of the positive electrode current collector. The negative electrode plate comprises a negative electrode current collector and negative electrode active material layers coated on two opposite sides of the negative electrode current collector.

Further, the first tab is a portion of one of the positive electrode sheet or the negative electrode sheet that is not coated with the active material layer, and the second tab is a portion of the other of the positive electrode sheet or the negative electrode sheet that is not coated with the active material layer. When the first tab is a part of the positive electrode sheet, which is not coated with the active material layer, and the second tab is a part of the negative electrode sheet, which is not coated with the active material layer, the first tab is the positive tab, and the second tab is the negative tab; when the first tab is a part of the negative electrode sheet, which is not coated with the active material layer, and the second tab is a part of the positive electrode sheet, which is not coated with the active material layer, the first tab is a negative tab, and the second tab is a positive tab. The first tab and the second tab may be located at two ends of the battery cell assembly, or may be located at the same end of the battery cell assembly, which is not limited herein.

The housing 11 may have a cavity for accommodating the power supply assembly therein, and the housing 11 may have a cylindrical shape, or may have other shapes such as a rectangular parallelepiped shape and a hexagonal prism shape.

In particular embodiments, the battery cell 100 further includes a current collecting plate (not shown) disposed within the housing 11 and between the cover plate 12 and the cell assembly. The first tab of the cell assembly is electrically connected with the current collecting plate, and the current collecting plate is electrically connected with the cover plate 12, so that the first tab of the cell assembly is electrically connected with the cover plate 12 through the current collecting plate. Optionally, the first tab of the cell assembly is welded to the current collecting plate, which is also welded to the cover plate 12. The assembly method of the collecting tray can adopt the mature prior art, and is not limited herein.

Alternatively, the protective layer 40 may be one or more of a nickel plating layer, a zinc plating layer, a chromium plating layer, or a titanium plating layer. When the protective layer 40 is a plurality of nickel plating layers, zinc plating layers, chromium plating layers, or titanium plating layers, the layers are merely stacked in structure, and the material of each layer is not changed.

Of course, in other embodiments, other materials may be used for the protective layer 40, as long as the protective layer can protect the housing 11, which is not limited herein. The material of the housing 11 may be steel, such as stainless steel, 304 steel, or the like.

It is understood that the thickness of the protective layer 40 and the thickness of the case 11 cannot be too thick or too thin, and the inventors of the present utility model creatively found that when the ratio of the thickness dimension of the protective layer 40 to the thickness dimension of the case 11 is less than 0.1, the protective layer 40 is too thin to cause plating defects such as incapability of plating or insufficient plating, while the case 11 is too thick to cause an increase in material cost, affecting space utilization. When the ratio of the thickness dimension of the shielding layer 40 to the thickness dimension of the case 11 is greater than 0.2, the excessive material of the shielding layer 40 at the weld reduces the amount of the material (e.g., steel) of the case 10, resulting in an increased tendency to generate air holes and thermal cracks; meanwhile, the case 11 is too thin to cause infiltration during molding.

In summary, the inventors of the present utility model creatively devised the thickness ratio of the protective layer 40 to the case 11. Specifically, the ratio of the thickness dimension of the protective layer 40 to the thickness dimension of the case 11 ranges from 0.1 to 0.2, thereby ensuring that the welding quality between the cover plate 12 and the case 11 is good, and also ensuring that the molding quality of the case 11 and the plating quality of the protective layer 40 are good. Preferably, the thickness dimension of the protective layer 40 is 1um to 5um, and the thickness dimension of the housing 11 is 0.1mm to 0.5mm.

In the embodiment of the present utility model, as shown in fig. 3, the cover 12 is welded to the housing 11, and the outer side wall of the housing 11 is provided with the soldering flux layer 50. The welding assisting layer 50 is at least partially located in a welding area where the casing 11 and the cover plate 12 are welded, so that when the cover plate 12 and the casing 11 are welded, the welding assisting layer 50 located in the welding area can play a role in improving the welding condition of the casing 11 and the cover plate 12, so that risks of poor welding such as air holes, explosion points and the like in welding are reduced, the welding quality of the casing 11 and the cover plate 12 is improved, the assembly qualification rate is high, and meanwhile, the safety of the battery cell 100 is improved.

Further, the melting point of the soldering flux layer 50 is lower than that of the case 11. Thus, when the cover plate 12 and the shell 11 are welded, the part of the welding auxiliary layer 50 is melted firstly due to the lower melting point of the welding auxiliary layer 50, and on one hand, the part of the cover plate 12 and the shell 11 is promoted to be melted quickly; on the other hand, the fusion of the cover plate 12 and the molten slurry formed by partial fusion of the shell 11 is promoted, so that the welding quality is improved, and the bonding strength of the cover plate 12 and the shell 11 is enhanced.

Alternatively, the material of the soldering mask 50 may be one or more of nickel, zinc, chromium or titanium. Of course, in other embodiments, other materials may be used for the soldering assisting layer 50, as long as the soldering quality of the cover plate 12 and the housing 11 can be improved, and the utility model is not limited thereto.

Optionally, the ratio of the thickness dimension of the protective layer 40 to the thickness dimension of the soldering layer 50 is between 1/3 and 3/4, for example 1/2. Further, the thickness dimension of the soldering flux layer 50 is between 1um and 5 um. Thus, the welding quality of the welding assisting layer 50 can be improved, the plating process requirement of forming the welding assisting layer 50 on the outer side wall of the shell 11 can be met, and the plating quality of the welding assisting layer 50 is ensured.

In some embodiments, the housing 11 has an annular end surface 114 disposed about the opening 111, the annular end surface 114 connecting the inner and outer walls of the housing 11. The cover plate 12 is attached to the annular end surface 114 and welded thereto. The soldering flux layer 50 covers at least one end of the housing 11 having the opening 111 such that at least part of the soldering flux layer 50 is located in a welding area when the cover plate 12 is welded to the annular end surface 114 of the housing 11, thereby enabling the soldering flux layer 50 to function to improve the welding quality between the cover plate 12 and the housing 11.

It is understood that the soldering flux layer 50 may cover the entire outer side wall of the housing 11, or may cover a portion of the outer side wall of the housing 11, so long as a portion of the soldering flux layer 50 is located in a welding area where the housing 11 and the cover plate 12 are welded.

In the embodiment where the soldering flux layer 50 covers part of the outer side wall of the case 11, as shown in fig. 4, the outer side wall of the case 11 includes a plated region a1 covering the soldering flux layer 50 and a non-plated region a2 not covering the soldering flux layer 50, and the plated region a1 is located at the end of the case 11 having the opening 111. The surface of the plating area a1 of the housing 11 is recessed inward such that the thickness dimension of the housing 11 at the plating area a1 is smaller than the thickness dimension at the non-plating area a 2. Thus, the plating area a1 is recessed so that the thickness is reduced, thereby reserving a space for plating the soldering flux layer 50 on the plating area a 1. Alternatively, the height dimension of the plating area a1 in the direction from the end of the housing 11 having the opening 111 toward the end of the housing 11 away from the opening 111 is 1mm to 5mm.

Further, the sum of the thickness of the case 11 at the plating region a1 and the thickness of the soldering-assist layer 50 is equal to the thickness of the case 11 at the non-plating region a2, so that a step is prevented from being formed between the soldering-assist layer 50 and the non-plating region a2 of the case 11 due to a height difference, and thus, the bad influence of the step on the assembly of the battery cell 100 is prevented.

It should be noted that the cover plate 12 is not limited to being welded to the annular end surface 114 of the housing 11. In other embodiments, as shown in fig. 5, the end of the housing 11 having the opening 111 extends inward to form an annular flange portion 15. The cover plate 12 is bonded and welded to the inner side surface of the annular burring 15. The weld-assist layer 50 covers at least the outer side surface of the annular burring portion 15. In this way, when the cover plate 12 is welded to the inner side surface of the annular flange portion 15, the welding assisting layer 50 on the outer side surface of the annular flange portion 15 can be used to improve the welding condition of the cover plate 12 and the annular flange portion 15, so that the welding quality of the cover plate 12 and the annular flange portion 15 is ensured to be better, and the risk of occurrence of welding failure phenomena such as air holes, explosion points and the like is reduced.

Referring to fig. 1 to 2, in the embodiment of the present utility model, the housing 11 further has an end wall portion 112 opposite to the opening 111, and the end wall portion 112 is provided with a mounting hole 113. The electrode terminal 60 is mounted at the mounting hole 113 through an insulator (not shown) such that the electrode terminal 60 is electrically connected to the second tab of the battery cell assembly and led out of the case 11. The electrode terminal 60 may be assembled by a more mature prior art, and is not limited thereto.

The housing 11 is not limited to the one-end opening 111. In other embodiments, both ends of the housing 11 may have openings 111, and the openings 111 at both ends of the housing 11 are covered with cover plates 12, and both cover plates 12 are welded to the annular end face 114 or the annular flange portion 15 of the housing 10.

Further, one of the cover plates 12 is electrically connected with the first tab of the battery cell assembly, and the other cover plate 12 is provided with a mounting hole, and the electrode terminal 60 is mounted at the mounting hole through an insulating member, so that the electrode terminal 60 is electrically connected with the second tab of the battery cell assembly and led out of the housing 11. The electrode terminal 60 may be assembled by a more mature prior art, and is not limited thereto.

Of course, in other embodiments, one electrode terminal 60 may be disposed on each of the two cover plates 12 or two electrode terminals 60 may be disposed on the same cover plate 12, and the two electrode terminals 60 are electrically connected to the first tab and the second tab of the battery module, respectively. The two electrode terminals 60 output electric power as a negative electrode and a positive electrode, respectively, as long as the output of electric power can be achieved, and are not limited herein.

Based on the above battery cell 100, the present utility model further provides a battery, which includes a case and the battery cell 100, wherein the battery cell 100 is accommodated in the case. The case is used to provide an accommodating space for the battery cell 100, and may have various structures, or may have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

In the battery, the number of the battery cells 100 may be plural, and the plural battery cells 100 may be connected in series, parallel, or series-parallel, where series-parallel refers to that the plural battery cells 100 are connected in both series and parallel. The plurality of battery cells 100 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 100 is accommodated in the box body; of course, the battery may also be a battery module formed by connecting a plurality of battery cells 100 in series or parallel or series-parallel connection, and then connecting a plurality of battery modules in series or parallel or series-parallel connection to form a whole and be accommodated in the case. The battery may further include other structures, for example, a bus bar member for making electrical connection between the plurality of battery cells 100. Wherein each battery cell 100 may be a secondary battery or a primary battery; but not limited to, lithium sulfur batteries, sodium ion batteries, or magnesium ion batteries.

Based on the battery, the utility model also provides electric equipment, and the electric equipment uses the battery as a power supply. The electric equipment can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric automobile, a ship, a spacecraft and the like.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (10)

1. A battery cell, comprising:

a case (10) for accommodating an electrolyte; a kind of electronic device with high-pressure air-conditioning system

The battery cell assembly is accommodated in the shell (10);

wherein, the inner wall of shell (10) is covered with inoxidizing coating (40), inoxidizing coating (40) are used for keeping apart electrolyte with shell (10).

2. The battery cell according to claim 1, wherein the housing (10) comprises a case (11) and a cover plate (12);

the cell assembly and the electrolyte are contained in the shell (11), the shell (11) is provided with an opening (111), and the cover plate (12) is used for closing the opening (111);

wherein the protective layer (40) covers the entire inner side wall of the housing (11).

3. The battery cell according to claim 2, wherein the ratio of the thickness of the protective layer (40) to the thickness of the housing (11) is between 0.1 and 0.2.

4. The battery cell according to claim 2, wherein the cover plate (12) is welded to the housing (11);

the outer side wall of the shell (11) is provided with a welding assisting layer (50), and the welding assisting layer (50) is at least partially positioned in a welding area where the shell (11) and the cover plate (12) are welded.

5. The battery cell according to claim 4, characterized in that the ratio of the protective layer (40) to the soldering-assist layer (50) is between 1/3 and 3/4.

6. The battery cell according to claim 4, wherein the housing (11) has an annular end face (114) arranged around the opening (111), the annular end face (114) connecting an inner wall and an outer wall of the housing (11);

the cover plate (12) is welded to the annular end face (114), and the soldering aid layer (50) covers at least one end of the housing (11) with the opening (111).

7. The battery cell according to claim 4, wherein an end of the case (11) having the opening (111) extends inward to form an annular burring part (15), and the cover plate (12) is fitted and welded to an inner side surface of the annular burring part (15); the weld-assist layer (50) covers at least the outer side surface of the annular burring part (15).

8. The battery cell of claim 1, wherein the protective layer (40) is one or more of a nickel plated layer, a zinc plated layer, a chromium plated layer, and a titanium plated layer.

9. A battery comprising a battery cell (100) according to any of claims 1 to 8.

10. A powered device comprising the battery of claim 9.