Housing assembly and battery cell having same

Abstract

The utility model discloses a shell assembly and a battery monomer with the shell assembly, the shell assembly comprises a cover plate, a shell body and an anti-explosion mark, a first position surface and a second position surface are formed on the cover plate or the shell body, the first position surface is parallel to the second position surface, and the first position surface and the second position surface are arranged in a staggered manner along the thickness direction of the cover plate or the shell body; the anti-explosion mark is formed at the joint of the first plane and the second plane, and D is less than H1 and / or D is less than H2; wherein D is the minimum thickness size of the explosion-proof mark between the first plane and the second plane, H1 is the maximum thickness size of the section, perpendicular to the cover plate or the shell body, of the first plane, and H2 is the maximum thickness size of the section, perpendicular to the cover plate or the shell body, of the second plane. According to the shell assembly provided by the utility model, the problems that the V-shaped nicks have corrosion risks and the consistency of products is difficult to control can be solved.

Description

Technical Field

[0001] The utility model mainly relates to the technical field of batteries, and in particular to a shell component and a battery cell having the same. Background Art

[0002] The battery cover is often provided with an explosion-proof valve. In the prior art, some explosion-proof valves are in the form of V-shaped notches, which are usually stamped and formed integrally with the cover. However, when stamping the V-shaped notches, the flow and extrusion of the material may cause the outer nickel plating layer to fall off, posing a corrosion risk. In addition, the V-shaped notches tend to reset after stamping, making it difficult to control product consistency. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a shell assembly, which can solve the problem that the V-shaped notch has a corrosion risk and the product consistency is difficult to control.

[0004] The utility model also provides a battery cell, which includes the above-mentioned housing assembly.

[0005] According to the shell component of the embodiment of the utility model, it includes a cover plate, a shell body and an explosion-proof mark, a first plane and a second plane are formed on the cover plate or the shell body, the first plane is parallel to the second plane, and the first plane and the second plane are staggered along the thickness direction of the cover plate or the shell body; the explosion-proof mark is formed at the connection between the first plane and the second plane, and satisfies: D

[0006] According to the shell assembly of the embodiment of the utility model, the first plane and the second plane are staggered to form an explosion-proof mark at the intersection, so that the explosion-proof valve after molding has higher consistency, avoiding the situation in the prior art that the flow and extrusion of the material may cause the nickel plating layer on the outer layer to fall off after the V-shaped notch is formed by stamping, reducing the risk of corrosion and improving the safety performance of the battery. In addition, the first plane and the second plane formed by the staggered layer have no tendency to reset after stamping, so that the consistency of the product can be guaranteed and the product precision is higher.

[0007] In some embodiments of the present invention, the first surface and the second surface are integrally formed.

[0008] ​In some embodiments of the present invention, the first surface and the second surface are integrally stamped.

[0009] In some embodiments of the utility model, along a direction parallel to the upper surface of the cover plate, the end surface of the first surface facing the second surface forms a first stamping surface, and the end surface of the second surface facing the first surface forms a second stamping surface; an angle m is formed between the first stamping surface and the upper surface of the second surface, and m≥90° is satisfied; an angle n is formed between the second stamping surface and the lower surface of the first surface, and n≥90° is satisfied.

[0010] In some embodiments of the utility model, an opening is formed at one end of the shell body in the thickness direction, the cover plate is arranged at the opening and is sealed with the shell body; a shell mating surface is formed on the end surface of the shell body facing the cover plate, and a cover plate mating surface is formed on the cover plate corresponding to the shell mating surface, and the shell mating surface is overlapped with the cover plate mating surface.

[0011] In some embodiments of the utility model, a shell guide surface is obliquely arranged at the junction of the inner wall of the shell body and the shell mating surface, and a cover guide surface is obliquely arranged between the bottom surface of the cover plate and the cover mating surface; the cover guide surface matches the inclination of the shell guide surface, and the shell guide surface is suitable for guiding the movement of the cover guide surface to guide the cover plate to cover the opening of the shell body.

[0012] In some embodiments of the present invention, the central axis of the cover plate guide surface coincides with the central axis of the shell guide surface.

[0013] In some embodiments of the present invention, the shell mating surface is connected to the cover plate mating surface by laser welding.

[0014] In some embodiments of the present invention, a liquid injection hole is also provided on the cover plate.

[0015] The battery cell according to the embodiment of the present invention comprises a pole group and the above-mentioned shell assembly, wherein the pole group is arranged in the shell assembly, and the pole group is electrically connected to the cover plate.

[0016] According to the battery cell of the embodiment of the utility model, the first plane and the second plane are staggered to form an explosion-proof mark at the intersection, so that the explosion-proof valve after forming is more consistent, avoiding the situation in the prior art that the flow and extrusion of the material may cause the nickel plating layer on the outer layer to fall off after the V-shaped notch is formed by stamping, reducing the risk of corrosion and improving the safety performance of the battery. In addition, the first plane and the second plane formed by the staggered layer do not have a tendency to reset after stamping, so that the consistency of the product can be guaranteed and the product precision is higher.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is a cross-sectional view of a battery cell according to an embodiment of the utility model;

[0020] Figure 2 yes Figure 1 The enlarged view of point A in the middle;

[0021] Figure 3 yes Figure 1 The enlarged view of point B in the middle;

[0022] Figure 4 is a schematic diagram of a battery cell according to an embodiment of the utility model;

[0023] Figure 5 is a cross-sectional view of a housing body according to an embodiment of the utility model;

[0024] Figure 6 yes Figure 5 Enlarged view of point C in the middle;

[0025] Figure 7 is a three-dimensional diagram of a cover plate according to an embodiment of the utility model;

[0026] Figure 8 is a cross-sectional view of a cover plate according to an embodiment of the utility model;

[0027] Fig. 9 yes Figure 8 The enlarged view of point D in the middle;

[0028] Fig.10 yes Figure 8 Enlarged view of point E in the middle.

[0029] Reference numerals:

[0030] 100. Battery cell;

[0031] 1. Cover plate; 2. Shell body; 3. Pole group;

[0032] 11. First plane; 12. Second plane; 13. Explosion-proof mark; 14. Cover plate guide surface; 15. Cover plate matching surface; 16. Liquid injection hole;

[0033] 21. Shell guide surface; 22. Shell mating surface;

[0034] 111, first stamping surface; 121, second stamping surface. DETAILED DESCRIPTION

[0035] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0036] In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] Reference below Figure 1-Figure 10 A housing assembly according to an embodiment of the present invention is described.

[0039] like Figure 1 and Figure 2 As shown, the shell assembly according to the embodiment of the utility model includes a cover plate 1, a shell body 2 and an explosion-proof mark 13.

[0040] Specifically, Figure 2As shown, a first plane 11 and a second plane 12 are formed on the cover plate 1 or the shell body 2, the first plane 11 and the second plane 12 are parallel, and the first plane 11 and the second plane 12 are staggered along the thickness direction of the cover plate 1 or the shell body 2. The explosion-proof mark 13 is formed at the connection between the first plane 11 and the second plane 12, and the first plane 11 and the second plane 12 are staggered, so as to facilitate the formation of the explosion-proof mark 13 at the intersection of the first plane 11 and the second plane 12.

[0041] In addition, if Figure 2 As shown, D

[0042] like Figure 2 As shown, by staggering the first plane 11 and the second plane 12 along the thickness direction of the cover plate 1 or the shell body 2, it is convenient to form an explosion-proof mark 13 at the intersection of the first plane 11 and the second plane 12. The explosion-proof mark 13 is thinner and weaker in strength. Therefore, when thermal expansion occurs inside the battery, the internal air pressure can break through the position of the explosion-proof mark 13, thereby facilitating exhaust.

[0043] According to the housing assembly of the embodiment of the utility model, the first plane 11 and the second plane 12 are arranged in a staggered manner so as to form an explosion-proof mark 13 at the intersection, so that the explosion-proof valve after forming is more consistent, and the flow and extrusion of the material after the V-shaped notch is formed by stamping in the prior art may cause the nickel plating layer on the outer layer to fall off, thereby reducing the risk of corrosion and improving the safety performance of the battery. In addition, the first plane 11 and the second plane 12 formed by the staggered layers do not have a tendency to reset after stamping, so that the consistency of the product can be guaranteed and the product precision is higher.

[0044] Optionally, a maximum cross-sectional dimension H1 of the first plane 11 in a cross-sectional dimension perpendicular to the cover plate 1 is equal to a maximum cross-sectional dimension H2 of the second plane 12 in a cross-sectional dimension perpendicular to the cover plate 1 .

[0045] In some embodiments of the present invention, the first plane 11 and the second plane 12 are integrally formed. By adopting the integral forming, the forming process of the first plane 11 and the second plane 12 is simplified, and the processing error caused by the mutual connection or assembly of the two is avoided.

[0046] ​In some embodiments of the utility model, the first plane 11 and the second plane 12 are integrally stamped and formed. By adopting integral stamping and forming, during the forming process of the first plane 11 and the second plane 12, a whole plate can be processed, and the staggered layers can be directly stamped to form the explosion-proof mark 13, making the forming process more convenient. And by reasonably adjusting the stamping size, the thickness of the explosion-proof mark 13 can be changed, so as to set the explosion force of the battery in thermal runaway as needed.

[0047] In some embodiments of the present invention, Figure 2 and Fig. 9 As shown, along the direction parallel to the upper surface of the cover plate 1, the end surface of the first plane 11 facing the second plane 12 forms a first stamping surface 111, and the end surface of the second plane 12 facing the first plane 11 forms a second stamping surface 121; an angle m is formed between the first stamping surface 111 and the upper surface of the second plane 12, and m≥90° is satisfied; an angle n is formed between the second stamping surface 121 and the lower surface of the first plane 11, and n≥90° is satisfied.

[0048] By setting the angle m≥90° between the first stamping surface 111 and the upper surface of the second surface 12, and setting the angle n≥90° between the second stamping surface 121 and the lower surface of the first surface 11, on the one hand, the forming of the first surface 11 and the second surface 12 can be made easier to avoid interference caused by the stamping process; on the other hand, when the explosion-proof mark 13 is subjected to internal pressure, it can explode more smoothly, avoiding interference between the first surface 11 and the second surface 12 after the fracture, and avoiding obstruction of the normal opening of the explosion-proof mark 13.

[0049] In some embodiments of the present invention, Figure 3 and Figure 4 As shown, an opening is formed at one end of the shell body 2 in the thickness direction, and the cover plate 1 is covered at the opening and sealed with the shell body 2; the end surface of the shell body 2 facing the cover plate 1 is formed with a shell mating surface 22, and the cover plate 1 is formed with a cover mating surface 15 corresponding to the shell mating surface 22, and the shell mating surface 22 is overlapped with the cover mating surface 15, so that after the cover plate 1 is covered at the opening of the shell body 2, good contact can be formed, which is convenient for the subsequent sealing connection of the cover plate 1 and the shell body 2. The cover plate 1 and the shell body 2 form a closed container, and the pole group 3 is placed therein. The pole group 3 is suitable for storing and releasing electricity, and the cover plate 1 can lead the current of the pole group 3 to the outside.

[0050] Optionally, the shell mating surface 22 and the cover plate mating surface 15 form a zero-gap fit after contact, thereby facilitating welding at the contact position, so as to seal the cover plate 1 and the shell.

[0051] In some embodiments of the present invention, Figure 5 , Figure 6 , Figure 8 and Fig.10 As shown, a shell guide surface 21 is obliquely provided at the junction of the inner wall of the shell body 2 and the shell mating surface 22, and a cover plate guide surface 14 is obliquely provided between the bottom surface of the cover plate 1 and the cover plate mating surface 15; the cover plate guide surface 14 matches the inclination of the shell guide surface 21, and the shell guide surface 21 is suitable for guiding the cover plate guide surface 14 to move, so as to guide the cover plate 1 to cover the opening of the shell body 2. By setting the cover plate guide surface 14 and the shell guide surface 21 with matching inclinations, when the cover plate 1 covers the opening of the shell body 2, the shell guide surface 21 can cooperate with the cover plate guide surface 14 to more easily guide the cover plate 1 to the preset installation position, which plays a dual role of guiding and positioning, reduces the difficulty of assembly, and enables the cover plate 1 to achieve precise positioning without the help of external equipment, thereby improving production efficiency and product yield.

[0052] In some embodiments of the present invention, the central axis of the cover plate guide surface 14 coincides with the central axis of the shell guide surface 21. By arranging the central axis of the cover plate guide surface 14 to coincide with the central axis of the shell guide surface 21, it is ensured that after the shell guide surface 21 and the cover plate guide surface 14 are assembled, the cover plate 1 and the shell body 2 can be centrally symmetrical, which plays a role in precise positioning.

[0053] In some embodiments of the present invention, the shell mating surface 22 is laser welded to the cover plate mating surface 15. The shell mating surface 22 and the cover plate mating surface 15 form a zero-gap fit after contact, thereby facilitating laser welding connection and forming a seal between the cover plate 1 and the shell.

[0054] In some embodiments of the present invention, Figure 7 As shown, the cover plate 1 is also provided with a liquid injection hole 16 to facilitate the injection of electrolyte into the shell assembly.

[0055] The battery cell 100 according to the embodiment of the present invention comprises an electrode group 3 and the above-mentioned shell assembly, wherein the electrode group 3 is arranged in the shell assembly, and the electrode group 3 is electrically connected to the cover plate 1, so that the electricity of the electrode group 3 can be transferred to the cover plate 1 and electrically connected to the external circuit through the cover plate 1.

[0056] According to the battery cell 100 of the embodiment of the utility model, the first plane 11 and the second plane 12 are arranged in a staggered manner so as to form an explosion-proof mark 13 at the intersection, so that the explosion-proof valve after forming is more consistent, and the flow and extrusion of the material after the V-shaped notch is formed by stamping in the prior art may cause the nickel plating layer on the outer layer to fall off, thereby reducing the risk of corrosion and improving the safety performance of the battery. In addition, the first plane 11 and the second plane 12 formed by the staggered layers do not have a tendency to reset after stamping, so that the consistency of the product can be guaranteed and the product precision is higher.

[0057] Other structures and operations of the housing assembly and the battery cell 100 having the housing assembly according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail herein.

[0058] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0059] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A housing assembly, characterized in that: include: Cover plate; The shell body, the cover plate or the shell body is formed with a first plane and a second plane, the first plane is parallel to the second plane, and along the thickness direction of the cover plate or the shell body, the first plane and the second plane are staggered; An explosion-proof mark, which is formed at the connection between the first surface and the second surface and satisfies: D<H1, and / or D<H2; Wherein, D is the minimum thickness dimension of the explosion-proof mark between the first plane and the second plane, H1 is the maximum thickness dimension of the first plane in the cross section perpendicular to the cover plate or the shell body, and H2 is the maximum thickness dimension of the second plane in the cross section perpendicular to the cover plate or the shell body.

2. The housing assembly according to claim 1, characterized in that: The first surface and the second surface are integrally formed.

3. The housing assembly according to claim 2, characterized in that: The first surface and the second surface are integrally formed by stamping.

4. The housing assembly according to claim 3, characterized in that: Along a direction parallel to the upper surface of the cover plate, the end surface of the first surface facing the second surface forms a first stamping surface, and the end surface of the second surface facing the first surface forms a second stamping surface; An angle m is formed between the first stamping surface and the upper surface of the second plane, and m≥90°; An angle n is formed between the second stamping surface and the lower surface of the first plane, and n≥90°.

5. The housing assembly according to claim 1, characterized in that: An opening is formed at one end of the shell body in the thickness direction, and the cover plate is arranged at the opening and is sealed and connected to the shell body; A shell mating surface is formed on the end surface of the shell body facing the cover plate, and a cover plate mating surface is formed on the cover plate corresponding to the shell mating surface. The shell mating surface is overlapped and connected with the cover plate mating surface.

6. The housing assembly according to claim 5, characterized in that: A shell guide surface is obliquely provided at the junction of the inner wall of the shell body and the shell matching surface, and a cover plate guide surface is obliquely provided between the bottom surface of the cover plate and the cover plate matching surface; The cover plate guide surface matches the inclination of the shell guide surface, and the shell guide surface is suitable for guiding the cover plate guide surface to move so as to guide the cover plate to cover the opening of the shell body.

7. The housing assembly according to claim 6, characterized in that: The central axis of the cover plate guide surface coincides with the central axis of the shell guide surface.

8. The housing assembly according to claim 5, characterized in that: The shell mating surface is connected to the cover plate mating surface by laser welding.

9. The housing assembly according to claim 1, characterized in that: The cover plate is also provided with a liquid injection hole.

10. A battery cell, characterized in that: include: Pole group; According to the shell assembly according to any one of claims 1-9, the pole group is arranged in the shell assembly, and the pole group is electrically connected to the cover plate.

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