Battery shell and battery

Abstract

The battery shell comprises a shell body, a through hole and an annular protrusion surrounding the through hole are arranged on the side wall of the shell body, the annular protrusion protrudes towards the outer side of the shell body, a mounting groove is formed by the annular protrusion and the side wall, and an anti-explosion valve is located in the mounting groove and arranged opposite to the through hole. The side walls located on the two sides of the annular protrusion are a first wall plate and a second wall plate respectively, and the outer surface of the first wall plate and the outer surface of the second wall plate are coplanar. According to the battery shell disclosed by the utility model, the annular bulge protruding outwards is arranged on the side wall of the shell, the annular bulge and the side wall form the mounting groove, the anti-explosion valve is positioned in the mounting groove, the side walls positioned on two sides of the annular bulge are coplanar, and the thickness of the annular bulge can meet the mounting requirement of the anti-explosion valve and can also meet the mounting requirement of the anti-explosion valve; the installation thickness of the explosion-proof valve does not affect the thickness of the shell, the explosion-proof valve does not occupy the internal space of the pole group and does not scratch the pole group to affect the battery cell, and the risk of failure of the battery cell is reduced.

Description

Technical Field

[0001] The utility model relates to the field of batteries, in particular to a battery shell and a battery. Background Art

[0002] In the related art, the explosion-proof valves of the battery cells are all located on the cover plate, which also contains poles with electrical connection functions. As a safety function, the explosion-proof valves need to be opened when the battery cells are in thermal runaway to discharge gas, causing electrolyte spraying and possible sparks and fires. Welding the explosion-proof valve on the side wall of the shell requires the shell to have sufficient wall thickness to form a step. Therefore, the wall thickness on one side of the welded explosion-proof valve is higher than the wall thickness on the other three sides, which increases the weight of the shell. In addition, the production and manufacturing process of this type of shell is immature, with low yield and slow efficiency, which increases the cost. 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, one purpose of the utility model is to provide a battery shell, wherein a side wall of the shell is provided with an annular protrusion protruding outward, and the thickness of the annular protrusion can meet the installation requirements of the explosion-proof valve and will not affect the thickness of the shell.

[0004] The utility model also provides a battery with a battery shell.

[0005] The battery shell according to the first aspect of the present invention includes: a shell, a side wall of the shell is provided with a through hole and an annular protrusion surrounding the through hole, the annular protrusion protrudes toward the outside of the shell, the annular protrusion and the side wall construct a mounting groove, the explosion-proof valve is located in the mounting groove and arranged opposite to the through hole, wherein the side walls located on both sides of the annular protrusion are respectively a first wall plate and a second wall plate, and the outer surface of the first wall plate is coplanar with the outer surface of the second wall plate.

[0006] According to the battery shell of the embodiment of the utility model, an annular protrusion protruding outward is provided on the side wall of the shell, and the annular protrusion and the side wall constitute a mounting groove. The explosion-proof valve is located in the mounting groove, and the side walls on both sides of the annular protrusion are coplanar. The thickness of the annular protrusion can meet the installation requirements of the explosion-proof valve, and the installation thickness of the explosion-proof valve will not affect the thickness of the shell. The explosion-proof valve will neither occupy the internal space of the pole group nor scratch the pole group to affect the battery cell, thereby reducing the risk of battery cell failure.

[0007] According to some embodiments of the present utility model, an outer surface of the explosion-proof valve facing away from the housing is coplanar with an outer surface of the annular protrusion facing away from the housing.

[0008] According to some embodiments of the present invention, a slit is formed on the inner side of the side wall, and the position of the slit is opposite to the annular protrusion and extends into the annular protrusion.

[0009] According to some embodiments of the present invention, in the radial direction of the annular protrusion, the size of the slit is e, which satisfies 0mm<e≤0.3mm.

[0010] According to some embodiments of the utility model, the annular protrusion includes a first plate body, a second plate body and a third plate body connected between the first plate body and the second plate body, the first plate body and the second plate body are arranged along the axial direction of the annular protrusion, the third plate body is arranged along the radial direction of the annular protrusion, the third plate body is connected to the same side of the first plate body and the second plate body, and in the radial direction of the annular protrusion, the first plate body and the second plate body are fitted or spaced apart.

[0011] According to some embodiments of the utility model, the shell is a square shell, comprising: two parallel and spaced-apart side panels and a plurality of enclosures connected between the two side panels, the area of ​​the side panels is larger than any one of the plurality of enclosures, and at least one of the enclosures is the side wall.

[0012] According to some embodiments of the present invention, the housing is an integrally formed stamping part.

[0013] According to some embodiments of the present invention, the thickness of the shell is a, satisfying 0.25mm≤a≤1mm.

[0014] According to some embodiments of the utility model, in the radial direction of the annular protrusion, the size of the first wall panel is b, satisfying b≥0.1mm; and / or, in the radial direction of the annular protrusion, the size of the annular protrusion is c, satisfying c≥0.5mm; and / or, in the radial direction of the annular protrusion, the size of the second wall panel is d, satisfying d≥2mm.

[0015] The battery according to the second aspect of the present invention comprises: an explosion-proof valve and a battery shell according to the first aspect of the present invention, wherein the explosion-proof valve is mounted on the battery shell.

[0016] According to the battery of the embodiment of the utility model, by providing the above-mentioned battery shell, it can meet the installation requirements of the explosion-proof valve without affecting the thickness of the shell, and the explosion-proof valve will not scratch the electrode group to affect the battery cell, thereby reducing the risk of battery cell failure and improving the safety of the battery.

[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 schematic diagram of a battery case according to an embodiment of the utility model;

[0020] Figure 2 It is a partial schematic diagram of an explosion-proof valve installed on a housing according to an embodiment of the utility model;

[0021] Figure 3 yes Figure 2 A partial schematic diagram of the middle shell;

[0022] Figure 4 yes Figure 3 A schematic diagram of another part of the middle shell;

[0023] Figure 5 is a schematic diagram of a housing without an annular protrusion according to an embodiment of the utility model;

[0024] Figure 6 This is a schematic diagram of the first step of processing the annular protrusion according to an embodiment of the utility model;

[0025] Figure 7 It is a schematic diagram of the second step of processing the annular protrusion according to an embodiment of the utility model;

[0026] Figure 8 It is a schematic diagram of the third step of processing the annular protrusion according to the embodiment of the utility model;

[0027] Fig. 9 It is a schematic diagram of the fourth step of processing the annular protrusion according to the embodiment of the utility model.

[0028] Reference numerals:

[0029] 100. Battery shell;

[0030] 10. Shell; 1. Side wall; 11. Through hole; 12. Annular protrusion; 121. First plate; 122. Second plate; 123. Third plate; 13. Mounting groove; 14. Slit; 15. Step; 2. First wall panel; 3. Second wall panel; 4. Side panel; 5. Enclosure;

[0031] 200. Explosion-proof valve. DETAILED DESCRIPTION

[0032] 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.

[0033] In the description of the present utility model, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions 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 direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0034] In the description of the present utility model, 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0035] Reference below Figure 1-Figure 9 A battery case 100 according to an embodiment of the present invention is described.

[0036] According to the battery shell 100 of the first aspect of the utility model, the battery shell 100 includes a shell 10, and the shell 10 defines a accommodating cavity. The electrode group is located in the accommodating cavity. The shell 10 is used to protect the electrode group from damage by the external environment and prevent water or dust from entering the accommodating cavity.

[0037] The side wall 1 of the housing 10 is provided with a through hole 11 and an annular protrusion 12. The annular protrusion 12 is arranged around the through hole 11. The through hole 11 is located in the space defined by the annular protrusion 12. The annular protrusion 12 protrudes toward the outside of the housing 10. The annular protrusion 12 and the side wall 1 form a mounting groove 13. The explosion-proof valve 200 is located in the mounting groove 13. The explosion-proof valve 200 is arranged opposite to the through hole 11. The through hole 11 is used to connect the pole group and the explosion-proof valve 200. When the battery fails thermally, the high-temperature gas in the pole group can be discharged to the explosion-proof valve 200 through the through hole 11, and then discharged to the external environment through the explosion-proof valve 200. The annular protrusion 12 can limit the installation of the explosion-proof valve 200, which is convenient for the installation of the explosion-proof valve 200; and the side wall 1 of the housing 10 in the mounting groove 13 can also play a certain supporting role for the explosion-proof valve 200. For example, the explosion-proof valve 200 can be installed by welding. For another example, two annular protrusions 12 are provided on the side wall 1 of the housing 10 , and the number of the explosion-proof valves 200 is equal to the number of the annular protrusions 12 and corresponds one to one.

[0038] Among them, the side walls 1 located on both sides of the annular protrusion 12 are respectively the first wall plate 2 and the second wall plate 3. For example, the first wall plate 2 is located on the side close to the center of the annular protrusion 12, the through hole 11 is located on the first wall plate 2, and the second wall plate 3 is located on the side away from the center of the annular protrusion 12; the outer surface of the first wall plate 2 is coplanar with the outer surface of the second wall plate 3, that is, the bottom surface of the mounting groove 13 is coplanar with the surface of the outer side wall 1 of the annular protrusion 12, and the explosion-proof valve 200 is located in the mounting groove 13, that is, the explosion-proof valve 200 is located outside the shell 10. On the one hand, the annular protrusion 12 can meet the installation requirements of the explosion-proof valve 200, and the installation thickness of the explosion-proof valve 200 will not affect the thickness of the shell 10. The installation of the explosion-proof valve 200 will not occupy the thickness space of the shell 10, which can reduce the weight of the shell 10; on the other hand, the explosion-proof valve 200 will neither occupy the internal space of the pole group nor scratch the pole group to affect the battery cell, thereby reducing the risk of battery cell failure.

[0039] In a specific example, the thickness of the housing 10 is a, which satisfies 0.25mm≤a≤0.8mm. Compared with the thickness of the housing 10 in the related art, the thickness of the housing 10 of the present application is relatively thin, and it is not easy to install the explosion-proof valve 200 in the housing 10. The present application sets an annular protrusion 12 on the outside of the housing 10, and defines a mounting groove 13 in the annular protrusion 12, and the explosion-proof valve 200 is located in the mounting groove 13. The annular protrusion 12 protrudes outward from the side wall 1 of the housing 10, and only the thickness of the annular protrusion 12 is required to meet the installation requirements of the explosion-proof valve 200. The thickness of the housing 10 can meet the strength requirements of the pole group, and the technical difficulty of installing the explosion-proof valve 200 on the thin-walled housing 10 can be solved.

[0040] According to the battery shell 100 of the embodiment of the utility model, an annular protrusion 12 protruding outward is provided on the side wall 1 of the shell 10, and the annular protrusion 12 and the side wall 1 form a mounting groove 13, and the explosion-proof valve 200 is located in the mounting groove 13, and the side walls 1 located on both sides of the annular protrusion 12 are coplanar. The thickness of the annular protrusion 12 can meet the installation requirements of the explosion-proof valve 200, and the installation thickness of the explosion-proof valve 200 will not affect the thickness of the shell 10. The explosion-proof valve 200 will neither occupy the internal space of the pole group nor scratch the pole group to affect the battery cell, thereby reducing the risk of battery cell failure.

[0041] According to some embodiments of the present invention, referring to Figure 1-Figure 4 The outer surface of the explosion-proof valve 200 facing away from the shell 10 is coplanar with the outer surface of the annular protrusion 12 facing away from the shell 10, that is, the outer surface of the explosion-proof valve 200 facing away from the shell 10 is flush with the outer surface of the annular protrusion 12 facing away from the shell 10, which can prevent the explosion-proof valve 200 from protruding from the installation groove 13, reduce the risk of the explosion-proof valve 200 being bumped, and improve the safety of the explosion-proof valve 200.

[0042] According to some embodiments of the present invention, referring to Figure 1-Figure 4 , a slit 14 is formed on the inner side of the side wall 1. The position of the slit 14 is opposite to the annular protrusion 12 and extends into the annular protrusion 12. The slit 14 can provide a certain deformation space for the shell 10. When the battery is working normally, the temperature of the pole group will change. As the temperature of the pole group changes, the gas content in the shell 10 will also change accordingly; when the gas in the shell 10 increases, the shell 10 can be deformed from the slit 14, the slit 14 becomes larger, and the annular protrusion 12 becomes larger, which can prevent the gas from constantly impacting the explosion-proof valve 200; when the gas in the shell 10 decreases, the shell 10 can be deformed from the slit 14, the slit 14 becomes smaller, the annular protrusion 12 becomes smaller, and the shell 10 does not change.

[0043] According to some embodiments of the present invention, referring to Figure 1-Figure 4 , Fig. 9 In the radial direction of the annular protrusion 12, the size of the slit 14 is e, which satisfies 0mm<e≤0.3mm. For example, the size of the slit 14 can be 0.1mm, 0.2mm, or 0.3mm. When the size of the slit 14 satisfies the above relationship, the size of the slit 14 will not be too large and will not occupy too much space of the annular protrusion 12.

[0044] According to some embodiments of the present invention, referring to Figure 1-Figure 4 , Fig. 9The annular protrusion 12 includes a first plate body 121, a second plate body 122 and a third plate body 123. The second plate body 122 surrounds the outer peripheral side of the first plate body 121, and the third plate body 123 is connected between the first plate body 121 and the second plate body 122. The first plate body 121 and the second plate body 122 are arranged along the axial direction of the annular protrusion 12, and the third plate body 123 is arranged along the radial direction of the annular protrusion 12. The third plate body 123 is connected to the same side of the first plate body 121 and the second plate body 122. In the radial direction of the annular protrusion 12, the first plate body 121 and the second plate body 122 are fitted or spaced apart.

[0045] The annular protrusion 12 can be formed by stamping the shell 10, and the annular protrusion 12 is formed by stamping from the inner side of the shell 10 to the outer side of the shell 10, the first plate 121 is connected to the first wall plate 2, and the second plate 122 is connected to the second wall plate 3. When the first plate 121 and the second plate 122 are spaced apart, there is a slit 14 between the first plate 121 and the second plate 122; when the first plate 121 and the second plate 122 are fitted together, the gas content in the shell 10 changes, the annular protrusion 12 can be deformed, and a slit 14 can also be formed between the first plate 121 and the second plate 122.

[0046] According to some embodiments of the present invention, referring to Figure 1-Figure 4 The housing 10 is a square housing 10, comprising: two parallel and spaced side panels 4 and a plurality of enclosures 5 connected between the two side panels 4, for example, the number of enclosures 5 can be four, the area of ​​the side panels 4 is larger than any one of the plurality of enclosures 5, and at least one of the enclosures 5 is a side wall 1. An annular protrusion 12 is formed on the side wall 1 of the housing 10, that is, an explosion-proof valve 200 is arranged on a narrow side wall of the housing 10. When the battery electrode group is installed in the battery pack, the enclosure 5 of the housing 10 is placed on the bottom wall of the battery pack, and the large surfaces of the housing 10 are abutted in sequence, and the explosion-proof valve 200 is arranged on the enclosure 5 of the housing 10, which facilitates the operation of the explosion-proof valve 200.

[0047] According to some embodiments of the present invention, referring to Figure 1-Figure 9 The housing 10 is an integrally formed stamping part, which not only ensures the structural strength of the housing 10 but also saves the process of installing the annular protrusion 12 on the housing 10 .

[0048] The following steps are the processing technology of the annular protrusion 12.

[0049] Step 1: roughly punching a through hole 11 on the enclosure 5 of the housing 10;

[0050] Step 2: punching the side wall 1 around the through hole 11 from the inner side of the housing 10 to form a step 15 protruding outward on the side wall 1;

[0051] Step 3: stamping the step 15 from the outside of the housing 10 to form an outwardly protruding annular protrusion 12 on the side wall 1;

[0052] Step 4: Fine punching to adjust the size of the through hole 11.

[0053] According to some embodiments of the present invention, referring to Figure 1-Figure 4 The thickness of the shell 10 is a, which satisfies 0.25 mm ≤ a ≤ 1 mm. For example, the thickness of the shell 10 can be 0.25 mm, 0.4 mm, 0.5 mm, 0.7 mm, 0.8 mm or 1 mm. The shell 10 within this thickness range is suitable for providing the annular protrusion 12 on the side wall 1 of the shell 10. If the thickness of the shell 10 is less than 0.25 mm, it is difficult to process the annular protrusion 12 on the shell 10.

[0054] According to some embodiments of the present invention, referring to Figure 1-Figure 4 In the radial direction of the annular protrusion 12 , the size of the first wall plate 2 is b, and b≥0.1 mm. For example, the size of the first wall plate 2 may be 0.1 mm, 0.13 mm, 0.15 mm or 0.2 mm. When b≥0.1 mm, the first wall plate 2 may support the explosion-proof valve 200 .

[0055] In the radial direction of the annular protrusion 12, the size of the annular protrusion 12 is c, and c≥0.5mm. For example, the size of the annular protrusion 12 can be 0.5mm, 0.55mm, 0.6mm or 0.65mm, etc. When c≥0.5mm, the strength of the explosion-proof valve 200 installed on the annular protrusion 12 can be guaranteed. For example, the explosion-proof valve 200 is welded by butt welding. The explosion-proof valve 200 and the annular protrusion 12 are butt welded, and the weld mark width is about 1mm. The explosion-proof valve 200 side and the annular protrusion 12 side each occupy about 0.5mm, that is, the minimum size of the annular protrusion 12 is 0.5mm.

[0056] In the radial direction of the annular protrusion 12, the size of the second wall plate 3 is d, and d≥2mm is satisfied. For example, the size of the second wall plate 3 can be 2mm, 2.5mm, 3mm or 3.5mm, etc. It is necessary to test the air tightness of the housing 10, and a sealing ring needs to be placed on the second wall plate 3. The width of the sealing ring is about 1mm, and the sealing ring needs to be reserved 0.5mm from the corner edge of the housing 10R and the edge of the annular protrusion 12, so d≥2mm.

[0057] The battery according to the second embodiment of the present invention comprises: an explosion-proof valve 200 and a battery shell 100 according to the first embodiment of the present invention, wherein the explosion-proof valve 200 is mounted on the battery shell 100.

[0058] According to the battery of the embodiment of the utility model, by providing the above-mentioned battery shell 100, it can meet the installation requirements of the explosion-proof valve 200, and will not affect the thickness of the shell 10, and the explosion-proof valve 200 will not scratch the electrode group to affect the battery cell, thereby reducing the risk of battery cell failure and improving the safety of the battery.

[0059] In the description of this specification, the description with reference to the terms "some embodiments", "optionally", "further" or "some examples" etc. 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.

[0060] 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 battery case, characterized in that: include: A shell, wherein a through hole and an annular protrusion surrounding the through hole are arranged on the side wall of the shell, the annular protrusion protrudes toward the outside of the shell, the annular protrusion and the side wall form a mounting groove, the explosion-proof valve is located in the mounting groove and arranged opposite to the through hole, wherein the side walls located on both sides of the annular protrusion are respectively a first wall plate and a second wall plate, and the outer surface of the first wall plate is coplanar with the outer surface of the second wall plate.

2. The battery case according to claim 1, characterized in that: An outer surface of the explosion-proof valve facing away from the housing is coplanar with an outer surface of the annular protrusion facing away from the housing.

3. The battery case according to claim 1, characterized in that: A slit is formed on the inner side of the side wall. The position of the slit is opposite to the annular protrusion and extends into the annular protrusion.

4. The battery case according to claim 3, characterized in that: In the radial direction of the annular protrusion, the size of the slit is e, satisfying 0mm<e≤0.3mm.

5. The battery case according to any one of claims 1 to 3, characterized in that: The annular protrusion includes a first plate body, a second plate body and a third plate body connected between the first plate body and the second plate body, the first plate body and the second plate body are arranged along the axial direction of the annular protrusion, the third plate body is arranged along the radial direction of the annular protrusion, the third plate body is connected to the same side of the first plate body and the second plate body, and in the radial direction of the annular protrusion, the first plate body and the second plate body are in contact with or spaced apart.

6. The battery case according to claim 1, characterized in that: The shell is a square shell, comprising: two parallel and spaced-apart side panels and a plurality of enclosure panels connected between the two side panels, the area of ​​the side panels is larger than any one of the plurality of enclosure panels, and at least one of the enclosure panels is the side wall.

7. The battery case according to claim 1, characterized in that: The housing is an integrally formed stamping part.

8. The battery case according to claim 1, characterized in that: The thickness of the shell is a, satisfying 0.25 mm ≤ a ≤ 1 mm.

9. The battery case according to claim 1, characterized in that: In the radial direction of the annular protrusion, the size of the first wall panel is b, satisfying b≥0.1mm; and / or, in the radial direction of the annular protrusion, the size of the annular protrusion is c, satisfying c≥0.5mm; and / or, in the radial direction of the annular protrusion, the size of the second wall panel is d, satisfying d≥2mm.

10. A battery, characterized in that: include: An explosion-proof valve and a battery shell according to any one of claims 1 to 9, wherein the explosion-proof valve is installed on the battery shell.

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