CN221009051U - Shell and battery cell with same - Google Patents

Abstract

The utility model discloses a shell and a battery cell with the same, wherein the shell defines a containing cavity, a supporting protrusion protruding towards the containing cavity is formed on the bottom wall of the containing cavity and used for supporting an electrode assembly arranged in the containing cavity, explosion-proof holes penetrating through the bottom wall of the containing cavity along the up-down direction are formed on the shell, and the explosion-proof holes and the supporting protrusions are arranged at intervals. According to the shell, the structure of the battery cell can be simplified, so that the working procedures during production are simplified, the production efficiency is improved, the production cost is reduced, and the reliability and the safety of the battery cell in the working process can be improved.

Description

Shell and battery cell with same

Technical Field

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

Background

During manufacturing of the electrode assembly shell, a round corner is punched at the joint of the bottom surface and the side surface of the shell, when the round corner is in contact with the electrode assembly, the stress of the contact point is concentrated, the electrode assembly is easy to damage, in the related art, in order to avoid the round corner from damaging the electrode assembly, a supporting plate is arranged between the electrode assembly and the bottom wall of the shell, the electrode assembly is separated from the round corner through the supporting plate, and therefore, the production process is complex, the production efficiency is low, and the production cost is high.

Disclosure of utility model

The present utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model is based on the object of providing a housing which can simplify the structure of the battery cells.

The utility model also provides a battery cell with the shell.

According to the housing of the first aspect of the utility model, the housing defines the accommodating chamber, the bottom wall of the accommodating chamber is provided with the supporting bulge protruding towards the accommodating chamber, the supporting bulge is used for supporting the electrode assembly arranged in the accommodating chamber, the housing is provided with the explosion-proof hole penetrating through the bottom wall of the accommodating chamber along the up-down direction, and the explosion-proof hole and the supporting bulge are arranged at intervals.

According to the shell of the first aspect of the utility model, the structure of the battery cell can be simplified, so that the working procedures during production are simplified, the production efficiency is improved, the production cost is reduced, and the reliability and the safety of the battery cell in the working process can be improved.

According to some embodiments of the utility model, the number of the supporting protrusions is one, or the number of the supporting protrusions is a plurality, and the plurality of the supporting protrusions are arranged on the bottom wall of the accommodating cavity at intervals.

According to some embodiments of the utility model, the height of the supporting protrusion protruding from the bottom wall of the accommodating cavity is greater than or equal to 0.2mm.

According to some embodiments of the utility model, a ratio of a height of the supporting protrusion protruding from the bottom wall of the accommodating chamber to a height of the housing is 0.0625 or less.

According to some embodiments of the utility model, the housing includes a bottom plate portion and a side plate portion, the bottom plate portion is horizontally disposed, the side plate portion is connected to a peripheral edge of the bottom plate portion and extends upward, the bottom plate portion is connected to the side plate portion in a circular arc, and the bottom plate portion and the side plate portion cooperate to define the accommodating chamber.

According to some embodiments of the utility model, the support protrusion is formed by a portion of the bottom plate portion protruding from a lower side surface toward an upper side surface of the bottom plate portion, and the support protrusion encloses a groove at the lower side surface of the bottom plate portion.

According to some embodiments of the utility model, the number of explosion proof holes is one or more.

The battery cell according to the second aspect of the present utility model includes: the electrode assembly and the shell according to the first aspect of the utility model are arranged in the accommodating cavity and supported on the supporting protrusion.

According to the battery cell of the second aspect of the utility model, by arranging the shell according to the first aspect of the utility model, the production efficiency can be improved, and the production cost can be reduced.

According to some embodiments of the utility model, the battery cell further comprises: the insulating film is coated on the outer side of the electrode assembly, a soaking hole is formed in the insulating film, and the soaking hole and the supporting protrusion on the insulating film are arranged in a staggered mode in a horizontal plane.

According to some embodiments of the utility model, the battery cell further comprises: the top cap subassembly, the top of casing is opened, the top cap subassembly closing cap in the top of casing, explosion-proof valve locates explosion-proof hole.

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

Fig. 1 is a bottom view of a battery cell according to an embodiment of the present utility model;

Fig. 2 is a front view of the battery cell shown in fig. 1;

FIG. 3 is a cross-sectional view in the direction A-A shown in FIG. 2;

Fig. 4 is a left side view of the battery cell shown in fig. 2;

fig. 5 is a sectional view in the B-B direction shown in fig. 5.

Reference numerals:

100. A battery cell;

10. A housing; 11. a receiving chamber; 111. a supporting protrusion; 112. round corners; 12. a bottom plate portion; 13. a side plate portion; 14. a groove;

20. An electrode assembly;

30. and a top cover assembly.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

A housing 10 according to an embodiment of the first aspect of the present utility model is described below with reference to fig. 1-5.

As shown in fig. 1, 3 and 5, according to the case 10 of the embodiment of the first aspect of the present utility model, the case 10 defines the accommodating chamber 11, the supporting protrusion 111 protruding toward the accommodating chamber 11 is formed on the bottom wall of the accommodating chamber 11, the supporting protrusion 111 is used to support the electrode assembly 20 provided in the accommodating chamber 11, the explosion-proof hole penetrating the bottom wall of the accommodating chamber 11 in the up-down direction is formed on the case 10, and the explosion-proof hole is spaced apart from the supporting protrusion 111.

When the electrode assembly 20 is assembled into the receiving chamber 11, the supporting protrusions 111 may support the electrode assembly 20 such that a gap is formed between the electrode assembly 20 and the rounded corners 112 at the corners of the bottom wall and the side walls of the receiving chamber 11, thereby preventing the electrode assembly 20 from contacting the rounded corners 112, and the gap between the electrode assembly 20 and the rounded corners 112 may provide a buffer space for the electrode assembly 20 when the electrode assembly 20 and the case 10 are relatively displaced due to vibration generated on the battery cell 100 during the operation of the battery cell 100, such that the electrode assembly 20 may not contact the rounded corners 112 within a normal displacement range of the electrode assembly 20 with respect to the case 10. Therefore, the reliability of the battery monomer 100 in the working process can be improved, and meanwhile, the structure of the battery monomer 100 can be simplified, so that the working procedures in production are simplified, the production efficiency is improved, and the production cost is reduced.

Wherein the normal displacement range of the electrode assembly 20 with respect to the case 10 means: the displacement of the electrode assembly 20 with respect to the case 10 does not cause structural changes in the battery cell 100 to affect the normal operation of the battery cell 100.

In the process of product design, the size of the supporting protrusion 111 can be adjusted according to the structure of the battery cell 100, so that the distance between the electrode assembly 20 and the rounded corners 112 is adjusted, more product design requirements are met, and the design difficulty is reduced.

When thermal runaway occurs in the battery cell 100, high-temperature and high-pressure gas is generated in the casing 10, and by arranging the explosion-proof hole, the high-temperature and high-pressure gas can flow out of the explosion-proof hole, so that the probability of thermal runaway spreading is reduced, the safety of the battery cell 100 in the working process is improved, the explosion-proof hole and the supporting protrusions 111 are arranged at intervals, gaps exist between the periphery of the explosion-proof hole and the electrode assembly 20, and therefore, the high-temperature and high-pressure gas has more accommodating spaces above the explosion-proof hole, and the probability of abrupt change of the flowing direction when the high-temperature and high-pressure gas flows out of the explosion-proof hole is lower, so that the exhaust is smoother. Thereby, safety in the operation of the battery cell 100 can be improved.

According to the case 10 of the embodiment of the first aspect of the present utility model, the structure of the battery cell 100 can be simplified, thereby simplifying the process during production, improving the production efficiency, reducing the production cost, and improving the reliability and safety of the battery cell 100 during operation.

In some embodiments of the present utility model, as shown in fig. 3 and 5, the number of the supporting protrusions 111 is one, or the number of the supporting protrusions 111 is plural, for example, the supporting protrusions 111 may be one, two or four, and the plurality of supporting protrusions 111 may be arranged at intervals on the bottom wall of the accommodating chamber 11. In this way, each of the support protrusions 111 may provide support for the electrode assembly 20, so that stability of the electrode assembly 20 in the receiving chamber 11 may be improved. The number and distribution of the supporting protrusions 111 can be adjusted during the product design process, thereby satisfying more design requirements.

In some embodiments of the present utility model, the height of the supporting protrusion 111 protruding from the bottom wall of the accommodating chamber 11 is 0.2mm or more. For example, the height of the supporting protrusions 111 protruding from the bottom wall of the receiving chamber 11 may be 0.2mm, 0.3mm, or 0.5mm, so that a sufficient distance between the electrode assembly 20 and the rounded corners 112 may be ensured, and the electrode assembly 20 may not contact the rounded corners 112 in a range of normal displacement of the electrode assembly 20 with respect to the case 10. In the product design process, the height of the supporting protrusion 111 protruding from the bottom wall of the accommodating chamber 11 can be adjusted to meet more product design requirements.

In some embodiments of the present utility model, the ratio of the height of the supporting protrusion 111 protruding from the bottom wall of the accommodating chamber 11 to the height of the housing 10 is 0.0625 or less. For example, the ratio of the height of the supporting protrusions 111 protruding from the bottom wall of the receiving chamber 11 to the height of the case 10 may be 0.0625, 0.06, or 0.05, such that the interval between the electrode assembly 20 and the bottom wall of the receiving chamber 11 is not excessively large, thereby preventing the volume of the battery cell 100 from being excessively large, and facilitating the arrangement of the battery cell 100. In the product design process, the ratio of the height of the supporting protrusion 111 protruding from the bottom wall of the accommodating cavity 11 to the height of the housing 10 can be adjusted, thereby meeting more product design requirements.

In some embodiments of the present utility model, as shown in fig. 3 and 5, the housing 10 includes a bottom plate portion 12 and a side plate portion 13, the bottom plate portion 12 is horizontally disposed, the side plate portion 13 is connected to a peripheral edge of the bottom plate portion 12 and extends upward, the bottom plate portion 12 is connected to the side plate portion 13 in a circular arc shape, and the bottom plate portion 12 and the side plate portion 13 cooperate to define the accommodating chamber 11. Like this, the structure of casing 10 is comparatively simple to the bottom plate portion 12 and the connection of curb plate portion 13 circular arc can reduce the degree of difficulty that realizes the connection of bottom plate portion 12 and curb plate portion 13 in the production process, from this, can reduce the production degree of difficulty, promotes production efficiency.

In the process of product design, the sizes of the bottom plate part 12 and the side plate part 13 can be adjusted, so that more product design requirements are met, and the product design difficulty is reduced.

In some embodiments of the present utility model, the shell 10 is stretch-formed, the efficiency of stretch-forming and die-unloading is high, and the die is simple, so that the production efficiency can be further improved, and the production cost can be reduced.

In some embodiments of the present utility model, as shown in fig. 1, 3 and 5, the supporting protrusion 111 is formed protruding from a portion of the bottom plate portion 12 from a lower side surface toward an upper side surface of the bottom plate portion 12, and the supporting protrusion 111 encloses the groove 14 at the lower side surface of the bottom plate portion 12. Thereby, the manufacturing process of the supporting protrusion 111 is simple, so that the manufacturing process of the housing 10 can be simplified, and the production efficiency can be improved, wherein the space between the lower side surface of the bottom plate portion 12 and the object below the supporting protrusion 111 is large at the groove 14, thereby facilitating the flow of gas between the housing 10 and the object below the housing 10.

In some embodiments of the utility model, the number of blast holes is one or more. For example, the number of explosion-proof holes may be one, two or four, so that each explosion-proof hole can exhaust, thereby improving the exhaust efficiency and further improving the safety of the battery cell 100 during operation.

A battery cell 100 according to an embodiment of the second aspect of the present utility model is described below with reference to fig. 1 to 5.

The battery cell 100 according to the embodiment of the second aspect of the present utility model, as shown in fig. 3 and 5, includes: electrode assembly 20 and the case 10 according to the embodiment of the first aspect of the present utility model described above, electrode assembly 20 is disposed in accommodating chamber 11 and supported on supporting protrusions 111.

According to the battery cell 100 of the second embodiment of the present utility model, by providing the case 10 according to the first embodiment of the present utility model as described above, the production efficiency can be improved and the production cost can be reduced.

In some embodiments of the present utility model, the battery cell 100 further includes: the insulating film is coated on the outer side of the electrode assembly 20, the insulating film is provided with infiltration holes, and the infiltration holes on the insulating film positioned on the lower side of the electrode assembly 20 are staggered with the supporting protrusions 111 in the horizontal plane. It should be noted that, can pour into electrolyte into and make electrode assembly 20 soak in electrolyte in holding chamber 11, through setting up the insulating film, the insulating film can make electrode assembly 20 and hold between the inner wall of chamber 11 insulating, through setting up the infiltration hole on the insulating film, electrolyte can be through infiltration hole and electrode assembly 20 contact, thereby realize electrode assembly 20's infiltration in electrolyte, through the infiltration hole on the insulating film that is located electrode assembly 20 downside and support protruding 111 stagger the setting in the horizontal plane, can reduce the probability that electrode assembly 20 and casing 10 contacted of infiltration hole department, thereby improve the reliability in the course of the operation of battery cell 100.

In some embodiments of the present utility model, as shown in fig. 2 to 4, the battery cell 100 further includes: a cap assembly 30 and an explosion proof valve. Wherein, the top of casing 10 is opened, and top cap subassembly 30 closing cap is in the top of casing 10, and explosion-proof valve locates the explosion-proof hole. Through setting up top cap subassembly 30, top cap subassembly 30 can provide the protection for electrode assembly 20, avoids electrode assembly 20 and battery cell 100 top object contact, through setting up the explosion-proof valve, and the explosion-proof hole can be closed and opened to the explosion-proof valve, and when the explosion-proof valve closed the explosion-proof hole, battery cell 100 can normally work, and when battery cell 100 takes place thermal runaway, the explosion-proof hole is opened to the explosion-proof valve, makes high temperature high pressure gas discharge.

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 one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly 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; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. 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 description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means 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 present utility model. In this specification, schematic representations of the above terms are not necessarily directed 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. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

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

Claims (10)

1. The utility model provides a casing, its characterized in that, the casing is limited and holds the chamber, hold and be formed with the orientation on the diapire in chamber hold the convex supporting bulge in chamber, supporting bulge is used for supporting to locate hold the electrode assembly in the intracavity, be formed with along the upper and lower direction link up on the casing the explosion proof hole that holds the diapire in chamber, explosion proof hole with supporting bulge interval arrangement.

2. The housing of claim 1, wherein the number of the supporting protrusions is one or the number of the supporting protrusions is plural, and the plurality of the supporting protrusions are arranged at intervals on the bottom wall of the accommodating chamber.

3. The housing according to claim 1, wherein a height of the supporting projection protruding from the bottom wall of the accommodating chamber is 0.2mm or more.

4. The housing of claim 1, wherein a ratio of a height of the support protrusion protruding from the bottom wall of the accommodation chamber to a height of the housing is 0.0625 or less.

5. The housing of claim 1, wherein the housing comprises a bottom plate portion and a side plate portion, the bottom plate portion is horizontally disposed, the side plate portion is connected to a peripheral edge of the bottom plate portion and extends upward, the bottom plate portion is connected to the side plate portion in a circular arc, and the bottom plate portion and the side plate portion cooperate to define the accommodation chamber.

6. The housing according to claim 5, wherein the support protrusion is formed by a portion of the bottom plate portion protruding from a lower side surface toward an upper side surface of the bottom plate portion, and the support protrusion encloses a groove at the lower side surface of the bottom plate portion.

7. The housing of claim 1, wherein the number of explosion proof holes is one or more.

8. A battery cell, comprising: an electrode assembly and the case according to any one of claims 1 to 7, the electrode assembly being provided in the accommodation chamber and supported on the support protrusions.

9. The battery cell of claim 8, wherein the battery cell further comprises: the insulating film is coated on the outer side of the electrode assembly, a soaking hole is formed in the insulating film, and the soaking hole and the supporting protrusion on the insulating film are arranged in a staggered mode in a horizontal plane.

10. The battery cell of claim 8, further comprising:

a top cover assembly, wherein the top of the shell is open, the top cover assembly covers the top of the shell,

The explosion-proof valve is arranged in the explosion-proof hole.