CN217009273U - Battery with a battery cell - Google Patents

Abstract

The utility model discloses a battery, which comprises a shell and a naked battery cell, wherein a groove is formed in the center of the inner surface of the bottom wall of the shell, and a core rod penetrates through the center of the naked battery cell. According to the battery, the groove is formed in the center of the inner surface of the bottom wall of the shell, the core rod penetrates through the center of the naked battery cell, one end, close to the bottom wall of the shell, of the core rod exceeds the naked battery cell and is matched with the naked battery cell in the groove, concentric positioning of the naked battery cell and the shell is achieved, and eccentricity caused by the fact that the naked battery cell cannot be centered in the shell to be connected in the assembling process of the battery is avoided, so that the problem that after the naked battery cell expands in the working process of the battery, part of the naked battery cell touches the shell, and the stability of the battery is affected is avoided.

Description

Battery with a battery cell

Technical Field

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

Background

Bare cells are an important component of batteries. Current battery is behind naked electric core entering shell, does not have the management and control to the concentricity of naked electric core and shell, causes naked electric core eccentric in the shell easily to cause the partial welding, and then at battery during operation, naked electric core inflation back, naked electric core contact shell influences the electrical property of battery.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving at least one of the problems of the prior art. To this end, the utility model proposes a battery which makes it possible to achieve a concentric positioning of the bare cell in the housing.

A battery according to an embodiment of the present invention includes: the center position of the inner surface of the bottom wall of the shell is provided with a groove; naked electric core, naked electric core is located in the shell, the plug is worn to be equipped with in the center of naked electric core, being close to of plug the one end of shell diapire surpasss naked electric core and cooperation are in the recess.

According to the battery provided by the embodiment of the utility model, the groove is formed in the central position of the inner surface of the bottom wall of the shell, the core rod penetrates through the center of the naked electric core, one end, close to the bottom wall of the shell, of the core rod exceeds the naked electric core and is matched in the groove, the concentric positioning of the naked electric core and the shell is realized, the situation that the naked electric core cannot be centered in the shell to cause connection eccentricity in the assembling process of the battery is avoided, and therefore, the situation that part of the naked electric core touches the shell after the naked electric core expands in the working process of the battery is avoided, and the stability of the battery is influenced. Meanwhile, on the basis of the existing battery, the concentric positioning of the bare cell and the shell can be realized without adding other structures, and the production process is saved.

According to some embodiments of the utility model, the cross-sectional area of the groove gradually increases in a direction from the bottom wall of the outer shell to the bare cell.

According to some embodiments of the utility model, a cross-sectional shape of the groove is the same as a shape of an outer profile of a cross-section of the mandrel.

According to some embodiments of the utility model, further comprising: the current collecting disc is arranged in the shell and located between the bottom wall of the shell and the naked electric core, the current collecting disc is connected with the naked electric core and the shell, and a through hole for avoiding the core rod is formed in the current collecting disc.

According to some embodiments of the utility model, the radial dimension of the through-going hole is greater than or equal to the maximum radial dimension of the groove; and/or the radial dimension of the through hole is larger than the radial dimension of the outer profile of the core rod.

According to some embodiments of the utility model, a cross-sectional shape of the through-hole is the same as a shape of an outer profile of a cross-section of the mandrel.

According to some embodiments of the utility model, the outer contour of the cross-section of the housing is circular; and/or the outer contour of the cross section of the current collecting disc is circular; and/or the outer contour of the cross section of the naked battery cell is circular.

According to some embodiments of the utility model, the current collecting disc is welded to the bare cell;

and/or the current collecting disc is connected with the bottom wall of the shell in a welding mode.

According to some embodiments of the utility model, the mandrel is a hollow rod.

According to some embodiments of the utility model, the outer profile of the cross-section of the mandrel is circular.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a partial structural schematic view of a battery according to an embodiment of the present invention.

Reference numerals:

100. a battery;

1. a housing; 11. a groove; 12. an accommodating chamber; 13. a housing sidewall; 14. a housing bottom wall;

2. a naked battery cell; 21. a core rod;

3. a current collecting plate; 31. a through hole.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the utility model. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

A battery 100 according to an embodiment of the present invention is described below with reference to fig. 1.

As shown in fig. 1, a battery 100 according to an embodiment of the present invention includes an outer case 1 and a bare cell 2.

Specifically, shell 1 includes shell roof, shell diapire 14 and shell lateral wall 13, and the upper end and the shell roof of shell lateral wall 13 are connected, and the lower extreme and the shell diapire 14 of shell lateral wall 13 are connected to inject and hold chamber 12, hold chamber 12 and be used for holding naked electric core 2, the central point of shell diapire 14 internal surface puts and is equipped with recess 11. It will be appreciated that the centre line of the recess 11 and the centre line of the bottom wall 14 of the housing may coincide, ensuring that the recess 11 is centred on the bottom wall 14 of the housing.

In naked electric core 2 located shell 1, the plug 21 is worn to be equipped with at the center of naked electric core 2, and the one end that is close to shell diapire 14 of plug 21 surpasss naked electric core 2 and cooperation in recess 11. It can be understood that, the central line of plug 21 and the central line of naked electric core 2 can coincide, can guarantee that plug 21 is located the central point of naked electric core 2 and put, and plug 21 surpasss in the part entering recess 11 of naked electric core 2 simultaneously, realizes that the central point of plug 21 puts the central point unanimity with the central point of 14 internal surfaces of shell diapire to make naked electric core 2 central point put with the central point of 14 internal surfaces of shell diapire unanimously.

According to battery 100 of the embodiment of the utility model, through being provided with recess 11 at the central point of the inner surface of outer shell bottom wall 14, wear to establish plug 21 at the center of naked electric core 2, the one end of plug 21 that is close to outer shell bottom wall 14 surpasss naked electric core 2 and cooperates in recess 11, realize the concentric positioning of naked electric core 2 and outer shell 1, it is eccentric to avoid battery 100 to lead to the fact to appear when connecting naked electric core 2 can't be placed in the middle in outer shell 1 in the assembling process, thereby avoid battery 100 in the during operation naked electric core 2 inflation back, partial naked electric core 2 touches outer shell 1, influence battery 100's stability. Meanwhile, on the basis of the existing battery 100, the concentric positioning of the bare cell 2 and the shell 1 can be realized without adding other structures, and the production process is saved.

Further, naked electric core 2 can be formed by winding around plug 21 layer by layer positive plate, diaphragm and negative plate according to same direction for the plug 21 is worn to be equipped with in naked electric core 2's center. Meanwhile, in order to avoid short-circuiting the bare cell 2 with other components by the core rod 21, the core rod 21 may be made of an insulating material, or the surface of the core rod may be provided with an insulating material.

According to the battery 100 of some embodiments of the present invention, since the core rod 21 is located at the central position of the bare cell 2, when the battery 100 extrudes the core rod 21 in the process of expansion or contraction of the bare cell 2 due to charging and discharging, the bare cell 2 can be prevented from deforming by the elasticity of the core rod 21, so as to support the bare cell 2, prevent the bare cell 2 from collapsing or prevent the battery 100 from generating a cleaning phenomenon due to wrinkles generated on the surface of the bare cell 2, and further ensure the safety of the battery 100.

In some embodiments of the present invention, as shown in fig. 1, the cross-sectional area of the groove 11 gradually increases from the bottom wall 14 of the outer shell to the bare cell 2.

According to the battery 100 of some embodiments of the present invention, since the cross-sectional area of the groove 11 gradually increases from the housing bottom wall 14 to the bare cell 2, the core rod 21 can enter the groove 11 more smoothly to match with the groove 11, and meanwhile, a certain guiding effect can be formed by such an arrangement, so as to improve the assembly efficiency of the battery 100.

In some embodiments of the utility model, the cross-sectional shape of the groove 11 is the same as the shape of the outer profile of the cross-section of the mandrel 21. In the present embodiment, the cross-sectional shape of the groove 11 is circular, and accordingly, the outer contour of the cross-section of the core rod 21 is also circular, but it is obvious to those skilled in the art after reading the following technical solutions that the cross-sectional shape of the groove 11 may also be other shapes, such as triangle, square, ellipse, other polygons, or other irregular shapes, and the shape of the outer contour of the cross-section of the core rod 21 is also the same.

The shape of the outer contour of the cross section of the core rod 21 is a shape surrounded by the outer contour of the cross section of the core rod 21.

According to the battery 100 of some embodiments of the present invention, by setting the shape of the cross section of the groove 11 to be the same as the shape of the outer contour of the cross section of the core rod 21, the core rod 21 is more matched with the groove 11, the concentricity of the bare cell 2 and the outer shell 1 is further ensured, and the safety performance of the battery 100 is improved.

In some embodiments of the present invention, the battery 100 further includes a current collecting plate 3, the current collecting plate 3 is disposed in the outer casing 1 and located between the outer casing bottom wall 14 and the bare cell 2, the current collecting plate 3 is connected to both the bare cell 2 and the outer casing 1, and the current collecting plate 3 is provided with a through hole 31 avoiding the core rod 21. It should be noted that, while the end of the core rod 21 away from the bare cell 2 passes through the through hole 31 to fit with the groove 11, it is necessary to ensure that the distance between the collecting plate 3 and the housing bottom wall 14 is a distance that can achieve connection therebetween.

According to the battery 100 provided by the embodiment of the utility model, the connection between the bottom wall 14 of the outer shell and the bare cell 2 is realized through the current collecting disc 3, the current collecting disc 3 can play a role in conducting electricity and simultaneously prevent the bare cell 2 from directly touching the outer shell 1, and meanwhile, the central position of the core rod 21 is consistent with the central position of the inner surface of the bottom wall 14 of the outer shell by the core rod 21 penetrating the through hole 31 into the groove 11, so that the central position of the bare cell 2 is consistent with the central position of the inner surface of the bottom wall 14 of the outer shell.

The shell 1 referred to in this application is defined as a cavity for accommodating the bare cell 2 and the current collecting tray 3, and the specific structure thereof is not limited, for example, it may be a shell with an opening at one end and a cover plate arranged at the opening, or may be a shell with openings at both ends and cover plates arranged at the two openings respectively; the utility model provides an outer shell diapire 14 is by outer shell 1, naked electric core 2 and current collecting plate 3's relative position decision, for example, when this current collecting plate 3 is anodal current collecting plate, this outer shell diapire 14 is the cavity inner wall or the apron that are relative with naked electric core 2 positive pole on this outer shell 1, when this current collecting plate 3 is negative pole current collecting plate, this outer shell diapire 14 is the cavity inner wall or the apron that are relative with naked electric core 2 negative pole on this outer shell 1. Taking the lithium ion battery 100 as an example, the material of the positive current collecting plate may be aluminum, and the material of the negative current collecting plate may be copper.

According to the battery 100 provided by the embodiment of the utility model, when the battery 100 vibrates during operation, the groove 11 and the core rod 21 are used for realizing concentric positioning of the bare cell 2 and the shell 1, and the main stress position is the position where the groove 11 is matched with the core rod 21, so that stress on the original connection part of the bare cell 2, the current collecting disc 3 and the current collecting disc 3 with the shell 1 is reduced, the current collecting disc 3 of the bare cell 2 or the current collecting disc 3 is prevented from falling off from the shell 1, and the safety of the battery 100 is improved.

In some embodiments of the utility model, as shown in fig. 1, the radial dimension of the through hole 31 is greater than or equal to the maximum radial dimension of the groove 11; and/or the radial dimension of the through hole 31 is larger than the radial dimension of the outer profile of the core rod 21. The radial dimension of the through hole 31 is the radial dimension, wherein the center of the through hole 31 is taken as the center, the direction of a connecting line between the center and the outer edge of the through hole 31 is the radial direction, and the dimension of the radial direction is the radial dimension; the radial dimension of the groove 11 is that the center of the groove 11 is taken as the center, the connecting line direction of the center and the outer edge of the outer contour of the groove 11 is the radial direction, and the dimension in the radial direction is the radial dimension; the radial dimension of the outer contour of the mandrel 21 is the radial dimension centered on the center of the mandrel 21, the direction of the line connecting the center and the outer edge of the outer contour of the mandrel 21 is the radial direction, and the dimension in the radial direction is the radial dimension.

It will be understood that the radial dimension of the through hole 31 is equal to or greater than the maximum radial dimension of the groove 11; or the radial dimension of the through hole 31 is larger than the radial dimension of the outer profile of the core rod 21; or the radial dimension of the through hole 31 is equal to or larger than the maximum radial dimension of the groove 11, and the radial dimension of the through hole 31 is larger than the radial dimension of the outer profile of the mandrel bar 21.

According to the battery 100 of some embodiments of the present invention, since the radial dimension of the through-hole 31 is equal to or greater than the maximum radial dimension of the groove 11; and/or the radial dimension of the through hole 31 is larger than the radial dimension of the outer profile of the core rod 21. Make the one end that naked electric core 2 was kept away from to plug 21 can pass through the through hole 31 smoothly and get into in the recess 11, further guaranteed the concentric location of naked electric core 2 with shell 1. Due to the fact that the core rod 21 and the current collecting disc 3 are made of different materials, the situation that the performance of the battery 100 is affected by direct contact of the core rod 21 and the current collecting disc 3 is avoided while one end, far away from the bare cell 2, of the core rod 21 can penetrate through the through hole 31 and enter the groove 11 is guaranteed.

In some embodiments of the present invention, the cross-sectional shape of the through-hole 31 is the same as the shape of the outer profile of the cross-section of the core rod 21. In the present embodiment, the cross-sectional shape of the through-hole 31 is a circle, and accordingly, the outer contour of the cross-section of the mandrel 21 is also a circle, but it is obviously conceivable that the cross-sectional shape of the through-hole 31 may also be other shapes, such as a triangle, a square, an ellipse, other polygons or other irregular shapes, after the following technical solutions are read, and in this case, the outer contour of the cross-section of the mandrel 21 is also the same as the outer contour of the cross-section of the mandrel 21.

It is understood that the cross-sectional shape of the through-hole 31 and the outer contour of the cross-section of the core rod 21 may be the same as the cross-sectional shape of the groove 11.

According to the battery 100 of some embodiments of the present invention, since the cross-sectional shape of the through-hole 31 is the same as the outer contour of the cross-section of the core rod 21, the core rod 21 is further facilitated to pass through the through-hole 31 into the groove 11, and the assembly efficiency of the battery 100 is improved.

In some embodiments of the utility model, the outer contour of the cross-section of the housing 1 is circular; and/or the outer contour of the cross section of the collecting disc 3 is circular; and/or the outer contour of the cross section of the naked battery cell 2 is circular. It can be understood that the outer contour of the cross section of any one or any two or all of the outer casing 1, the current collecting plate 3 and the bare cell 2 is circular.

For example, the outer contour of the cross section of the outer casing 1 is circular, that is, the battery 100 is in the shape of a cylinder, or the outer contour of the cross section of the current collecting disc 3 is circular, or the outer contour of the cross section of the bare cell 2 is circular; for another example, the outer contours of the outer shell 1 and the bare cell 2 are circular, or the outer contours of the cross sections of the outer shell 1 and the current collecting disc 3 are circular, or the outer contours of the cross sections of the bare cell 2 and the current collecting disc 3 are circular; for another example, as shown in fig. 1, the outer contours of the cross sections of the outer casing 1, the current collecting disc 3 and the bare cell 2 are all circular, that is, the battery 100 is a cylindrical battery.

Preferably, the outer contour of the cross section of the outer shell 1 is circular, the outer contour of the cross section of the current collecting disc 3 is circular, and the outer contour of the cross section of the bare cell 2 is circular.

According to the battery 100 of some embodiments of the present invention, by setting the outer contour of the cross section of any one or any two or all of the outer casing 1, the current collecting plate 3 and the bare cell 2 of the battery 100 to be circular, the heat dissipation effect of the battery 100 is better and the expansion of the volume of the battery 100 is reduced compared to the battery 100 with a square or other polygonal outer contour in the cross section during the operation process.

In some embodiments of the utility model, the current collecting disc 3 is welded to the bare cell 2; and/or the collecting tray 3 is welded to the housing bottom wall 14. It is understood that the connection of the current collecting plate 3 to any or all of the bare cell 2 and the current collecting plate 3 to the bottom wall 14 of the outer casing is a welded connection. Preferably, the welding connection mode adopts laser welding.

For example, the current collecting plate 3 is welded with the bare cell 2, or the current collecting plate 3 is welded with the bottom wall 14 of the housing; for another example, the current collecting plate 3 and the bare cell 2, and the current collecting plate 3 and the housing bottom wall 14 are all connected by welding.

According to the battery 100 of some embodiments of the present invention, the current collecting plate 3 is connected to any one or all of the bare cell 2 and the current collecting plate 3 and the case bottom wall 14 by welding, so that the connection between the current collecting plate 3 and the bare cell 2 and the connection between the current collecting plate 3 and the case bottom wall 14 are facilitated in the assembly process of the battery 100, the reliability of the connection between the current collecting plate 3 and the bare cell 2 and the reliability of the connection between the current collecting plate 3 and the case bottom wall 14 can be ensured, and the influence on the sealing of the case 1 can be reduced.

Simultaneously, realize naked electric core 2 and shell 1's concentric location through the cooperation of above-mentioned plug 21 and recess 11, can avoid the emergence of partial welding when current collecting plate 3 and naked electric core 2 and current collecting plate 3 and shell diapire 14 welded connection, can avoid current collecting plate 3 and naked electric core 2 and current collecting plate 3 and shell 1's solder joint to drop when battery 100 work vibrates, improved battery 100's security. Further, the connection mode of laser welding is adopted, so that the positioning accuracy and the matching accuracy between the current collecting disc 3 and the bare cell 2 and between the current collecting disc 3 and the shell bottom wall 14 can be improved, and the stability and the safety of the battery 100 are further improved.

In some embodiments of the present invention, as shown in FIG. 1, core rod 21 is a hollow rod. Further, the core rod 21 may be manufactured by an injection molding process.

According to the battery 100 of some embodiments of the present invention, since the core rod 21 is a hollow rod, the overall weight of the battery 100 can be reduced while reducing the production cost of the battery 100. In addition, the core rod 21 is manufactured by an injection molding process, so that the weight of the battery 100 can be reduced, the core rod is not easy to corrode, and the service life of the battery 100 is prolonged.

In some embodiments of the utility model, the outer profile of the cross-section of the mandrel 21 is circular. Further, the outer contour of the core rod 21 may be a cylinder shape with a constant cross-sectional dimension, and the positive plate, the separator, and the negative plate constituting the bare cell 2 may be formed by winding around the core rod 21 in the same direction.

According to the battery 100 of some embodiments of the present invention, since the outer profile of the cross section of the core rod 21 is circular, the structure of the core rod 21 is simple, and further the structure of the bare cell 2 is simple, the production cost of the battery 100 is reduced, and the concentric positioning of the bare cell 2 and the housing 1 is conveniently ensured.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A battery, comprising:

the center position of the inner surface of the bottom wall of the shell is provided with a groove;

naked electric core, naked electric core is located in the shell, the plug is worn to be equipped with at the center of naked electric core, being close to of plug the one end of shell diapire surpasss naked electric core and cooperation are in the recess.

2. The battery of claim 1, wherein the groove has a gradually increasing cross-sectional area in a direction from the housing bottom wall to the bare cell.

3. The battery of claim 1, wherein a cross-sectional shape of the groove is the same as a shape of an outer profile of a cross-section of the mandrel.

4. The battery of claim 1, further comprising:

the current collecting plate, the current collecting plate is located in the shell and be located the shell diapire with between the naked electric core, the current collecting plate with naked electric core with the shell is all connected, be equipped with on the current collecting plate and dodge the through hole of plug.

5. The battery according to claim 4,

the radial dimension of the through hole is larger than or equal to the maximum radial dimension of the groove;

and/or the radial dimension of the through hole is larger than the radial dimension of the outer profile of the core rod.

6. The battery of claim 4, wherein a cross-sectional shape of the through-hole is the same as an outer profile of a cross-section of the mandrel.

7. The battery according to claim 4,

the outer contour of the cross section of the shell is circular;

and/or the outer contour of the cross section of the current collecting disc is circular;

and/or, the outline of the cross section of naked electric core is circular.

8. The battery of claim 4, wherein the current collector plate is welded to the bare cell;

and/or the current collecting disc is connected with the bottom wall of the shell in a welding mode.

9. The battery of claim 1, wherein the mandrel is a hollow rod.

10. The battery of claim 1, wherein the mandrel has a cross-sectional outer profile that is circular.

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