CN221961109U - Battery monomer, battery and power consumption device - Google Patents

Abstract

The present disclosure provides a battery cell, a battery and an electric device, and relates to the field of batteries. The battery cell includes: a shell, a battery cell, a positive busbar and a negative busbar, the shell has a receiving cavity, the bottom of the shell itself has a corner position, and the side wall of the shell has a blocking portion bent toward its own central axis; the battery cell is accommodated in the receiving cavity; the positive busbar is directly welded to the top surface of the shell and the positive electrode of the battery cell, the positive busbar has a liquid injection hole, and the positive busbar is provided with an explosion-proof valve; the negative busbar is installed at the corner position through a sealing component, and the sealing component is sandwiched between the blocking portion, the corner position, the negative busbar and the battery cell; the sealing component is used to block the conduction between the battery cell and the shell; the sealing component has a blocking protrusion or blocking depression that intersects with at least one horizontal path for the flow of electrolyte, and the blocking protrusion or blocking depression is used to block the electrolyte from flowing from a low position to a high position. It can block the outflow of electrolyte and improve the service life of the battery.

Description

Battery monomer, battery and power-consuming device

Technical Field

The present disclosure relates to the field of batteries, and in particular to a battery cell, a battery and an electrical device.

Background Art

When assembling existing batteries, the shell is connected to the positive terminal cover and the negative terminal cover by welding, which results in the inability to seal and insulate the negative terminal cover and the shell. The overall structure has many welding positions and welding processes, and the assembly complexity is high. When the battery is charged and discharged, there are many positive/negative electrode guide structures, which leads to an increase in the on-resistance of the battery of the disclosed embodiment, increasing the heat loss of the battery and reducing the battery life.

Utility Model Content

The present disclosure provides a battery cell, a battery and an electrical device to at least solve the above technical problems existing in the prior art.

According to a first aspect of the present disclosure, a battery cell is provided, comprising: a shell, a battery cell, a positive busbar and a negative busbar, wherein the shell has a accommodating cavity, the bottom of the shell itself has a corner position, and the side wall of the shell has a blocking portion bent toward its own central axis near the corner position; the battery cell is accommodated in the accommodating cavity; the positive busbar is directly welded to the top surface of the shell and the positive electrode of the battery cell, the positive busbar has a liquid injection hole, and the positive busbar is provided with an explosion-proof valve; the negative busbar is installed at the corner position through a sealing component, and the sealing component is sandwiched between the blocking portion, the corner position, the negative busbar and the battery cell; the sealing component is used to block the conduction between the battery cell and the shell; the sealing component has a blocking protrusion or a blocking recess that intersects at least one horizontal path for the flow of electrolyte, and the blocking protrusion or the blocking recess is used to block the electrolyte from flowing from a low position to a high position.

In some embodiments, the sealing component includes a first sealing ring, which is sleeved on the outer circumference of the battery core and pressed between the blocking portion and the battery core.

In some embodiments, the sealing member further includes a second sealing ring, which is configured as a transversely arranged U-shaped structure having an opening on one side; the second sealing ring is wrapped around the edge periphery of the negative electrode busbar through the opening.

In some embodiments, the inner top wall of the inner cavity of the second sealing ring has a first blocking protrusion or a first blocking recess;

The first blocking protrusion is configured as a protrusion structure extending from the inner top wall toward the negative electrode busbar; or

The first blocking recess is configured as a recessed structure extending from the inner top wall toward the blocking portion.

In some embodiments, the top surface of the negative electrode busbar has a first groove portion which is pressed against and closely fits the first blocking protrusion; or

The top surface of the negative electrode busbar has a first protrusion that presses against and fits tightly against the first blocking recess.

In some embodiments, the negative electrode busbar has a limiting protrusion on the top surface, and the limiting protrusion has a first groove portion which is pressed against and closely fits with the first blocking protrusion; or

The top surface of the limiting protrusion has a first protrusion that presses against and fits tightly against the first blocking recess.

In some embodiments, the corner of the housing has a first inner bottom surface, the second sealing ring has a first outer bottom wall, the first outer bottom wall is pressed against and tightly fitted to the first inner bottom surface, and the first outer bottom wall has a second blocking protrusion or a second blocking recess;

The second blocking protrusion is configured as a protruding structure extending from the first outer bottom wall toward the first inner bottom surface; or

The second blocking recess is configured as a recessed structure extending from the first outer bottom wall toward itself.

In some embodiments, the first inner bottom surface of the housing has a second groove portion that presses against and fits tightly against the second blocking protrusion; or

The first inner bottom surface of the housing has a second protrusion that presses against and fits tightly against the second blocking recess.

According to a second aspect of the present disclosure, a battery is provided, comprising the above battery cell.

According to a third aspect of the present disclosure, there is provided an electrical device, comprising the above battery, the battery being used to provide electrical energy, or comprising the above battery cell, the battery cell being used to provide electrical energy.

The battery cell, battery and power-consuming device disclosed in the present invention are provided with a sealing member between the shell, the negative busbar and the battery cell, and the sealing member can block the conduction between the battery cell and the shell, so that the conduction resistance of that part of the shell can be reduced, thereby reducing the heat loss of the battery. In addition, the sealing member has a blocking protrusion or blocking depression that intersects with at least one horizontal path for the flow of electrolyte, and the blocking protrusion or blocking depression is used to block the flow of electrolyte from a low position to a high position. It can be understood that a blocking protrusion or blocking depression is provided on the horizontal path of the electrolyte outflow path, and the mating surface where the blocking protrusion or blocking depression is located has a mutual squeezing force in the vertical direction, and the mating surface is an uneven flow path. Under the action of the squeezing force, the electrolyte cannot flow from a low position to a high position, thereby effectively blocking the outflow of the electrolyte and improving the service life of the battery.

It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present disclosure, nor is it intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present disclosure are shown in an exemplary and non-limiting manner, in which:

In the drawings, the same or corresponding reference numerals represent the same or corresponding parts.

FIG1 is a schematic diagram showing the structure of a battery cell according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram showing an enlarged structure of location A in a battery cell according to an embodiment of the present disclosure.

Description of the numbers in the figure:

10-battery cell; 11-housing; 12-battery cell; 13-positive bus bar; 14-negative bus bar; 15-sealing member; 151-first sealing ring; 152-second sealing ring; 111-accommodating cavity; 112-corner position; 113-blocking portion; 114-first inner bottom surface; 1511-inner ring; 1512-outer ring; 1521-inner top wall; 1522-first blocking protrusion; 1523-second blocking protrusion; 1524-first outer bottom wall; 141-first groove portion; 142-second groove portion.

DETAILED DESCRIPTION

In order to make the purpose, features, and advantages of the present disclosure more obvious and easy to understand, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present disclosure.

For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between one or more components or features shown in the figure and other components or features. It should be understood that spatially relative terms include not only the orientation of the components as described in the figure, but also different orientations in use or operation. For example, if the components in the accompanying drawings are inverted as a whole, the components "above other components or features" or "above other components or features" will include the situation where the components are "below other components or structures" or "below other components or structures". Therefore, the exemplary term "above" may include both "above" and "below". In addition, these components or features may also be positioned at other different angles (e.g., rotated 90 degrees or other angles), and this article is intended to include all of these situations.

It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present disclosure. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and/or "include" are used in this specification, it indicates the presence of features, steps, operations, parts, components and/or combinations thereof.

It should be noted that the terms "first", "second", etc. in the specification, claims, and drawings of the present disclosure are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present disclosure described herein are used to be implemented in an order other than those illustrated or described herein.

In the description of the present disclosure, it is necessary to understand that the orientation or positional relationship indicated by the directional words is usually based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present disclosure and simplifying the description. Unless otherwise stated, these directional words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present disclosure; the directional words "inside" and "outside" refer to the inside and outside relative to the outline of each component itself.

The embodiment of the present disclosure provides a battery cell, which can reduce the welding process and prevent the conduction problem between the battery cell and the shell. The specific contents are as follows:

With reference to FIGS. 1 and 2 , the present disclosure provides a battery cell 10, comprising: a shell, a battery cell 12, a positive busbar 13, and a negative busbar 14, wherein the shell has a receiving cavity 111, the bottom of the shell has a corner position 112, and the side wall of the shell has a blocking portion 113 bent toward the central axis of the shell near the corner position 112; the battery cell 12 is received in the receiving cavity 111; the positive busbar 13 is directly welded to the top surface of the shell and the positive electrode of the battery cell 12, and the positive busbar 13 has a liquid injection hole The positive busbar 13 is provided with an explosion-proof valve; the negative busbar 14 is installed at the corner position 112 through the sealing component 15, and the sealing component 15 is sandwiched between the blocking portion 113, the corner position 112, the negative busbar 14 and the battery cell 12; the sealing component 15 is used to block the conduction between the battery cell 12 and the shell; the sealing component 15 has a blocking protrusion or blocking depression that intersects at least one horizontal path for the flow of electrolyte, and the blocking protrusion or blocking depression is used to block the electrolyte from flowing from a low position to a high position.

Compared with the prior art, the embodiment of the present disclosure sets a sealing member 15 between the shell, the negative busbar 14 and the battery cell 12. The sealing member 15 can block the conduction between the battery cell 12 and the shell, so that the conduction resistance of that part of the shell can be reduced, thereby reducing the heat loss of the battery. In addition, the sealing member 15 has a blocking protrusion or blocking depression that intersects with at least one horizontal path for the flow of electrolyte. The blocking protrusion or blocking depression is used to block the flow of electrolyte from a low position to a high position. It can be understood that a blocking protrusion or blocking depression is set on the horizontal path of the electrolyte outflow path. The matching surface where the blocking protrusion or blocking depression is located has a mutual squeezing force in the vertical direction. The matching surface is an uneven flow path. Under the action of the squeezing force, the electrolyte cannot flow from a low position to a high position, thereby effectively blocking the outflow of the electrolyte and improving the service life of the battery.

Further referring to FIG. 2 , the sealing member 15 includes a first sealing ring 151, which is sleeved on the outer periphery of the battery cell 12 and pressed between the blocking portion 113 and the battery cell 12. Exemplarily, the first sealing ring 151 is made of an insulating material. By pressing the first sealing ring 151 between the blocking portion 113 of the housing 11 and the battery cell 12, the blocking portion 113 and the battery cell 12 can be directly blocked.

Exemplarily, the first sealing ring 151 is configured as a special-shaped sealing ring.

Exemplarily, further referring to Figure 2, the first sealing ring 151 includes an inner ring 1511 and an outer ring 1512, and at least a portion of the structure of the outer ring 1512 is pressed against or tightly fitted against the inner wall of the shell, and at least a portion of the structure of the outer ring 1512 is directly pressed against and tightly fitted against the blocking portion 113 of the outer shell 11, so that a tightly fitting mating surface is formed between the outer ring 1512 and the outer shell 11; at least a portion of the structure of the inner ring 1511 is pressed against and tightly fitted against the outer wall of the battery cell 12, and a gap is formed between at least a portion of the structure of the inner ring 1511 and the outer wall of the battery cell 12, and the gap between the two gradually increases from top to bottom.

Further referring to FIG. 2 , the sealing member 15 further includes a second sealing ring 152, which is a U-shaped structure with an opening on one side and is disposed transversely; the second sealing ring 152 is wrapped around the edge periphery of the negative electrode busbar 14 through the opening. In this way, the negative electrode busbar 14 can be assembled with the housing and the battery cell 12 without welding, so that the housing, the negative electrode busbar 14 and the battery cell 12 are not directly connected.

Exemplarily, the second sealing ring 152 is configured as a special-shaped sealing ring.

Exemplarily, the inner top wall 1521 of the inner cavity of the second sealing ring 152 has a first blocking protrusion 1522 or a first blocking recess; wherein the first blocking protrusion 1522 is configured as a protrusion structure from the inner top wall 1521 toward the negative electrode bus bar 14; or the first blocking recess is configured as a recessed structure from the inner top wall 1521 toward the blocking portion 113. Referring to FIG. 2 , the inner top wall 1521 of the inner cavity of the second sealing ring 152 has a first blocking protrusion 1522.

For example, not shown in the figure, the top surface of the negative busbar 14 has a first groove portion 141 pressed against and tightly fitted with the first blocking protrusion 1522; or the top surface of the negative busbar 14 has a first protrusion pressed against and tightly fitted with the first blocking depression.

In this way, the horizontal path between the top surface of the negative busbar 14 and the second sealing ring 152 can be set at the matching surface between the first blocking protrusion 1522 and the first groove portion 141, blocking the electrolyte from flowing from a low position to a high position, thereby preventing leakage of the electrolyte. Alternatively, the horizontal path between the top surface of the negative busbar 14 and the second sealing ring 152 can be set at the matching surface between the first blocking recess and the first protrusion, blocking the electrolyte from flowing from a low position to a high position, thereby preventing leakage of the electrolyte.

Further referring to FIG2 , considering that the edge dimension and thickness of the negative busbar 14 are relatively small, in order to improve the yield rate of the molding process, the top surface of the negative busbar 14 is provided with a limiting protrusion, and the top surface of the limiting protrusion has a first groove portion 141 that presses against and fits tightly with the first blocking protrusion 1522; or the top surface of the limiting protrusion has a first protrusion portion (not shown in the figure) that presses against and fits tightly with the first blocking depression. In this way, the aforementioned function of blocking the electrolyte from flowing from a low position to a high position can be achieved, thereby preventing the electrolyte from leaking out.

Exemplarily, the corner position 112 of the shell has a first inner bottom surface 114, and the second sealing ring 152 has a first outer bottom wall 1524. The first outer bottom wall 1524 is pressed against and tightly fits the first inner bottom surface 114, and the first outer bottom wall 1524 has a second blocking protrusion 1523 or a second blocking recess (not shown in the figure); the second blocking protrusion 1523 is constructed as a protruding structure from the first outer bottom wall 1524 toward the first inner bottom surface 114; or the second blocking recess is constructed as a recessed structure from the first outer bottom wall 1524 toward itself.

Exemplarily, the first inner bottom surface 114 of the shell has a second groove portion 142 pressed against and tightly fitted with the second blocking protrusion 1523; or the first inner bottom surface 114 of the shell has a second protrusion portion (not shown in the figure) pressed against and tightly fitted with the second blocking recess.

In this way, the horizontal path between the first inner bottom surface 114 of the shell and the second sealing ring 152 can be set at the matching surface between the second blocking protrusion 1523 and the second groove portion 142, blocking the electrolyte from flowing from a low position to a high position, thereby preventing leakage of the electrolyte. Alternatively, the horizontal path between the first inner bottom surface 114 of the shell and the second sealing ring 152 can be set at the matching surface between the second blocking recess and the second protrusion, blocking the electrolyte from flowing from a low position to a high position, thereby preventing leakage of the electrolyte.

The embodiment of the present disclosure further provides a battery, including the above battery cell 10. All the effects of the battery cell 10 can be achieved, which will not be described in detail here.

The embodiment of the present disclosure also provides an electric device, including the battery as above, the battery is used to provide electric energy, or including the battery cell 10 as above, the battery cell 10 is used to provide electric energy. All the effects of the battery cell 10 can be achieved, which will not be described in detail here.

In the battery cell 10, battery and electrical device of the embodiment of the present disclosure, the positive busbar 13 is directly welded to the positive electrode of the battery cell 12, and the positive busbar 13 is directly welded to the top surface of the shell. During the assembly process, the busbars are welded by sealing nails, and the negative busbar 14 is directly welded to the negative electrode of the battery cell 12. The welding process is reduced as a whole, and the process cost is reduced. In addition, during the assembly process, the insulating sealing ring is deformed under the action of pressure, and the position of the electrolyte overflow channel adopts a special-shaped design (the first blocking protrusion 1522 and the second blocking protrusion 1523, or the first blocking recess and the second blocking recess), so that the electrolyte cannot overflow through the straight channel, thereby achieving a good sealing effect.

In summary, the positive terminal of the embodiment of the present disclosure directly uses the positive busbar 13 as the end cover, the positive busbar 13 is welded to the positive electrode of the battery cell 12, the negative busbar 14 is welded to the negative electrode of the battery cell 12, the positive busbar 13 and the shell are sealed and welded to form the positive terminal, the positive busbar 13 and the battery cell 12 are welded at the positive electrode of the battery cell 12, the welding area between the positive busbar 13 and the positive electrode of the battery cell 12 is increased, the positive busbar 13 is designed with a liquid injection hole position and an explosion-proof valve position, the negative terminal is composed of a special-shaped negative busbar 14/a special-shaped insulating sealing ring (second sealing ring 152)/an inner insulating ring (first sealing ring 151), the special-shaped negative busbar 14 and the special-shaped insulating sealing ring (second sealing ring 152) are assembled to form an assembly, the incoming material is inspected for the assembly to detect whether the special-shaped negative busbar 14 and the special-shaped insulating sealing ring (second sealing ring 152) are matched at the special-shaped position, and the bottom of the shell is inspected. The shaped design makes the special-shaped insulating sealing ring (second sealing ring 152) cooperate with the special-shaped position at the bottom of the shell. After the negative end is sealed, the overflow channel of the electrolyte is at the cooperation position between the special-shaped insulating sealing ring (second sealing ring 152) and the special-shaped negative bus 14. The overflow channel is at the cooperation position between the special-shaped insulating sealing ring (second sealing ring 152) and the special-shaped shell. The special-shaped negative bus 14 and the special-shaped insulating sealing ring (second sealing ring 152) are squeezed through the shell to seal the overflow channel position of the electrolyte. The special-shaped insulating sealing ring (second sealing ring 152) and the special-shaped bottom of the shell seal the overflow channel position of the electrolyte. The overflow channel position of the electrolyte adopts a special-shaped slope design to prevent the overflow of the electrolyte under the action of gravity to achieve a better sealing effect. The shell extrusion position, that is, the aforementioned blocking portion 113, is designed with a contoured insulating ring (first sealing ring 151) to prevent the shell from contacting the battery cell 12 through the blocking portion 113 after being squeezed.

It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this disclosure can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solutions disclosed in this disclosure can be achieved, and this document does not limit this.

In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present disclosure, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims (10)

1. A battery cell, comprising: A shell, wherein the shell has a receiving cavity, the bottom of the shell has a corner position, and the side wall of the shell has a blocking portion bent toward the central axis of the shell near the corner position; A battery cell, the battery cell being accommodated in the accommodation cavity; A positive busbar, the positive busbar is directly welded to the top surface of the shell and the positive electrode of the battery cell, the positive busbar has a liquid injection hole, and the positive busbar is provided with an explosion-proof valve; A negative electrode busbar, wherein the negative electrode busbar is installed at the corner position through a sealing component, and the sealing component is sandwiched between the blocking portion, the corner position, the negative electrode busbar and the battery cell; the sealing component is used to block the conduction between the battery cell and the shell; the sealing component has a blocking protrusion or a blocking recess that intersects at least one horizontal path for the flow of electrolyte, and the blocking protrusion or the blocking recess is used to block the electrolyte from flowing from a low position to a high position. 2 . The battery cell according to claim 1 , wherein the sealing component comprises a first sealing ring, the first sealing ring is sleeved on the outer circumference of the battery cell, and the first sealing ring is pressed between the blocking portion and the battery cell. 3. The battery cell according to claim 2 is characterized in that the sealing component further comprises a second sealing ring, which is constructed as a transversely arranged U-shaped structure with an opening on one side; the second sealing ring is wrapped around the edge periphery of the negative electrode busbar through the opening. 4. The battery cell according to claim 3, characterized in that the inner top wall of the inner cavity of the second sealing ring has a first blocking protrusion or a first blocking recess; The first blocking protrusion is configured as a protrusion structure extending from the inner top wall toward the negative electrode busbar; or The first blocking recess is configured as a recessed structure extending from the inner top wall toward the blocking portion. 5. The battery cell according to claim 4, characterized in that the top surface of the negative electrode busbar has a first groove portion pressed against and tightly fitted with the first blocking protrusion; or The top surface of the negative electrode busbar has a first protrusion that presses against and fits tightly against the first blocking recess. 6. The battery cell according to claim 4, characterized in that the top surface of the negative busbar has a limiting protrusion, and the top surface of the limiting protrusion has a first groove portion that presses against and fits tightly with the first blocking protrusion; or The top surface of the limiting protrusion has a first protrusion that presses against and fits tightly against the first blocking recess. 7. The battery cell according to claim 3, characterized in that the corner position of the shell has a first inner bottom surface, the second sealing ring has a first outer bottom wall, the first outer bottom wall presses against and fits tightly against the first inner bottom surface, and the first outer bottom wall has a second blocking protrusion or a second blocking recess; The second blocking protrusion is configured as a protruding structure extending from the first outer bottom wall toward the first inner bottom surface; or The second blocking recess is configured as a recessed structure extending from the first outer bottom wall toward itself. 8. The battery cell according to claim 7, characterized in that the first inner bottom surface of the shell has a second groove portion pressed against and tightly fitted by the second blocking protrusion; or The first inner bottom surface of the housing has a second protrusion that presses against and fits tightly against the second blocking recess. 9. A battery, characterized by comprising the battery cell according to any one of claims 1 to 8. 10. An electrical device, characterized in that it comprises the battery as claimed in claim 9, wherein the battery is used to provide electrical energy, or comprises the battery cell as claimed in any one of claims 1 to 8, wherein the battery cell is used to provide electrical energy.