Power battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a power battery, which comprises a shell, a cover plate and a battery cell, the shell comprises a side plate, a bottom plate and a connecting part, the side plate and the bottom plate are enclosed to form an accommodating cavity, the connecting part and the bottom plate are respectively and fixedly arranged at two ends of the side plate, and a connecting groove is formed in one side, facing the accommodating cavity, of the connecting part; the connecting part is arranged around the outer edge of the cover plate, and the side wall of the cover plate, at least part of the bottom face of the cover plate and at least part of the top face of the cover plate are all located in the connecting groove so that the cover plate can be fixedly connected with the side plate. The battery cell is arranged in the accommodating cavity; therefore, the connecting part abuts against the side wall of the cover plate, the bottom surface of at least part of the cover plate and the top surface of at least part of the cover plate, so that the stability of the cover plate and the shell can be improved, enough air tightness is kept, bad defects caused by welding are avoided, the yield and the assembly efficiency of the power battery are improved, the structural strength of the joint of the cover plate and the shell is enhanced, and the service life of the power battery is prolonged. And the air tightness and the safety of the power battery are improved.

Description

Technical Field

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

[0002] With the development of society, batteries are widely used in various fields of daily life. As a common battery, power batteries are used to drive electric vehicles (such as electric cars, electric motorcycles, electric bicycles, etc.).

[0003] The power battery includes a cover plate, a shell and a battery cell. The cover plate and the shell are fixedly connected by welding. The battery cell is arranged inside the shell and protected by the cover plate and the shell. The cover plate is provided with a pole electrically connected to the battery cell to enable the power battery to be electrically connected to the external circuit.

[0004] Due to poor welding stability and high tolerance requirements for the fit between the cover and the shell, quality problems such as weld holes, fire, cold welds, and weld deviation may occur during the assembly and welding of the cover and the shell, reducing the yield of the power battery and affecting the airtightness and safety of the battery cell after assembly. Utility Model Content

[0005] The purpose of the utility model is to provide a power battery to solve the problems of low yield, poor air tightness and safety of the power battery after the cover plate and the shell are welded.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] A power battery comprises: a shell, the shell comprising side panels, a bottom panel and a connecting portion, the side panels and the bottom panel enclosing a receiving cavity, the connecting portion and the bottom panel being fixedly arranged at both ends of the side panels, respectively, and the connecting portion being provided with a connecting groove on a side facing the receiving cavity; a cover panel, the connecting portion being arranged around an outer edge of the cover panel, the side wall of the cover panel, at least a portion of the bottom surface of the cover panel, and at least a portion of the top surface of the cover panel being located in the connecting groove, so that the cover panel is fixedly connected to the side panels; and a battery cell, the battery cell being arranged in the receiving cavity.

[0008] Preferably, the connecting portion includes a horizontal portion and a vertical portion, and there are two horizontal portions. The two horizontal portions are arranged at both ends of the vertical portion and are respectively connected to the top surface of the cover plate and the bottom surface of the cover plate, and the vertical portion is connected to the side wall of the cover plate. The horizontal portion and the vertical portion enclose to form a connecting groove.

[0009] Preferably, the two horizontal portions of the connecting portion have the same length.

[0010] Preferably, the power battery further includes a sealing ring, which is arranged between the connecting portion and the cover plate, and the sealing ring is arranged in the connecting groove and connected to the cover plate.

[0011] Preferably, the side wall of the cover plate is connected with a lap block, the sealing ring is provided with a sealing groove on the side facing the cover plate, the lap block is arranged in the sealing groove, and the side wall of the cover plate located below the lap block is at least partially in contact with the inner wall of the side plate.

[0012] Preferably, the sealing ring includes a first part, a second part and a third part, the first part, the second part and the third part enclose to form the sealing groove, the first part is connected to the top surface of the cover plate, the second part is connected to the side wall of the cover plate, and the third part is connected to the bottom surface of the cover plate.

[0013] Preferably, the side of the sealing ring facing the cover plate is flush with the side of the connecting portion facing the cover plate.

[0014] Preferably, the bottom surface of the cover is connected to a lower plastic, and the lower plastic is located in the accommodating cavity.

[0015] Preferably, the width of the lower plastic is smaller than the width of the cover.

[0016] Preferably, the connecting portion and the side panel are integrally formed.

[0017] Beneficial effects of the utility model:

[0018] A power battery includes a shell, a cover plate and a battery cell. The shell includes side plates, a bottom plate and a connecting portion. The side plates and the bottom plate are enclosed to form a accommodating cavity. The connecting portion and the bottom plate are respectively fixedly arranged at both ends of the side plates. The connecting portion is provided with a connecting groove on the side facing the accommodating cavity. The connecting portion is arranged around the outer edge of the cover plate. The side wall of the cover plate, at least part of the bottom surface of the cover plate, and at least part of the top surface of the cover plate are all located in the connecting groove, so that the cover plate is fixedly connected to the side plate. The battery cell is arranged in the accommodating cavity.

[0019] In this way, the connecting part is fixedly connected to the side plate, so that the shell can be connected to the cover plate through the connecting part. Since the connecting part abuts against the top surface, bottom surface and side surface of the cover plate, the connection stability between the shell and the cover plate can be improved, and the fitting tolerance requirements can be reduced. Since the shell and the cover plate are tightly abutted, the airtightness and stability of the power battery can be improved, and the structural strength of the connection between the cover plate and the shell can be enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a power battery in one embodiment of the present utility model;

[0021] Figure 2This is a partial cross-sectional view of a power battery in one embodiment of the present utility model;

[0022] Figure 3 In one embodiment of the present utility model Figure 2 Enlarged view of point A.

[0023] In the picture:

[0024] 1. Shell; 11. Side panel; 12. Bottom plate; 13. Connecting portion; 131. Connecting groove; 132. Horizontal portion; 133. Vertical portion; 14. Accommodating cavity; 2. Cover plate; 21. Overlap block; 22. Lower plastic; 23. Pole; 3. Sealing ring; 31. Sealing groove; 32. First portion; 33. Second portion; 34. Third portion. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0026] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0027] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0028] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0029] See Figure 1 and Figure 2 The present invention provides a power battery, including a shell 1, a cover plate 2 and a battery cell (not shown in the figure). The shell 1 includes a side plate 11, a bottom plate 12 and a connecting portion 13. The side plate 11 and the bottom plate 12 enclose a accommodating cavity 14. The connecting portion 13 and the bottom plate 12 are respectively fixedly arranged at both ends of the side plate 11. The connecting portion 13 is provided with a connecting groove 131 on the side facing the accommodating cavity 14; the connecting portion 13 is arranged around the outer edge of the cover plate 2, and the side wall of the cover plate 2, at least part of the bottom surface of the cover plate 2, and at least part of the top surface of the cover plate 2 are all located in the connecting groove 131, so that the cover plate 2 is fixedly connected to the side plate 11, that is, the connecting portion 13 is in contact with the side wall of the cover plate 2, the bottom surface of the cover plate 2, and the top surface of the cover plate 2 to limit the relative position of the connecting portion 13 and the cover plate 2; the battery cell is arranged in the accommodating cavity 14.

[0030] In this embodiment, the side panel 11 and the bottom panel 12 are integrally formed and enclose a square accommodating cavity 14 . The connecting portion 13 is fixedly arranged on a side of the side panel 11 close to the cover panel 2 . The longitudinal section of the connecting groove 131 is square, and the opening is arranged toward the cover panel 2 .

[0031] It should be noted that the bottom surface of the cover plate 2 is also the side of the cover plate 2 close to the accommodating cavity 14 , and the top surface of the cover plate 2 is also the side of the cover plate 2 away from the accommodating cavity 14 .

[0032] In this way, by making the connecting portion 13 abut against the top surface, bottom surface and side surface of the cover plate 2, the cover plate 2 can be stably connected to the shell 1, with lower fitting tolerance requirements, and can maintain sufficient airtightness, avoiding defects caused by welding between the shell 1 and the cover plate 2, improving the yield and assembly efficiency of the power battery, and the connecting portion 13 is fixedly connected to the cover plate 2, which can enhance the structural strength of the cover plate 2, thereby enhancing the overall structural strength of the power battery and improving the airtightness and safety of the power battery.

[0033] It is understandable that the longitudinal cross-section of the connecting groove 131 may also be other shapes. In this embodiment, the longitudinal cross-section of the connecting groove 131 is square in order to match the outer edge shape of the cover plate 2, thereby increasing the contact area between the connecting groove 131 and the cover plate 2, so as to improve the stability of the connecting portion 13 and the cover plate 2. The specific shape of the connecting groove 131 can be flexibly adjusted.

[0034] See Figure 2 Furthermore, the connection portion 13 and the side panel 11 are integrally formed. In this embodiment, when the cover panel 2 is assembled to the side panel 11, the end of the side panel 11 facing away from the bottom panel 12 is formed into the connection portion 13 by a rolling process to achieve a tight connection with the cover panel 2.

[0035] In this way, the connecting portion 13 can fully abut against the cover plate 2, thereby enhancing the airtightness of the connection between the cover plate 2 and the shell 1, avoiding leakage, damage, etc., and bending the end of the side plate 11 away from the bottom plate 12 to form the connecting portion 13, which can improve assembly efficiency and stably connect the connecting portion 13 to the cover plate 2, avoiding welding defects, improving the yield of the power battery, and enhancing the airtightness and safety of the power battery.

[0036] See Figure 2 In some embodiments, the connecting portion 13 includes a horizontal portion 132 and a vertical portion 133. Two horizontal portions 132 are provided. The two horizontal portions 132 are provided at both ends of the vertical portion 133 and are respectively connected to the top surface of the cover plate 2 and the bottom surface of the cover plate 2. The vertical portion 133 is connected to the side wall of the cover plate 2. The horizontal portion 132 and the vertical portion 133 enclose to form a connecting groove 131.

[0037] Among them, the shape of the outer edge of the cover plate 2 is adapted to the shape of the connecting groove 131, the height direction of the vertical portion 133 is parallel to the height direction of the side panel 11, and the vertical portion 133 and the two horizontal portions 132 together form a C-shaped structure in the longitudinal section, which is used to surround the outer edge of the cover plate 2, and the vertical portion 133 protrudes from the side panel 11.

[0038] In this way, the vertical portion 133 and the two horizontal portions 132 can jointly limit the position of the cover plate 2, so that its relative position with the side plate 11 is fixed, thereby improving the connection stability between the cover plate 2 and the side plate 11 and avoiding defects caused by welding. In addition, the vertical portion 133 and the horizontal portion 132 are both in contact with the cover plate 2, which can provide a stable supporting force for the cover plate 2, making it difficult for the cover plate 2 to deviate after being connected to the connecting portion 13, thereby improving the yield of the power battery and enhancing the stability and safety of the power battery.

[0039] It can be understood that the cross-sectional shape of the connecting portion 13 is not limited to a C-shape, but can also be a semicircular shape, an oblique angle shape, etc. The cross-sectional shape of the connecting portion 13 can be flexibly adjusted according to actual design needs. In this embodiment, the vertical portion 133 and the horizontal portion 132 are provided to fit closely with the cover plate 2, thereby achieving the limitation and support of the cover plate 2.

[0040] See Figure 2 In some embodiments, the two horizontal portions 132 of the connecting portion 13 have the same length. That is, the two horizontal portions 132 of the connecting portion 13 are flush with one side of the cover plate 2 .

[0041] In this way, the top and bottom surfaces of the cover plate 2 can be subjected to the same supporting force, and the structural strength of the connection between the top and bottom surfaces of the cover plate 2 and the connecting portion 13 is improved. The connecting portion 13 is tightly connected and firmly pressed to the cover plate 2 through the rolling process, which can enhance the airtightness of the power battery, avoid electrolyte leakage, improve the yield of the power battery, and enhance the stability and safety of the power battery.

[0042] It can be understood that the lengths of the two horizontal portions 132 of the connecting portion 13 may also be different. For example, the length of the horizontal portion 132 connected to the top surface of the cover plate 2 may be greater than the length of the horizontal portion 132 connected to the bottom surface of the cover plate 2, or may be less than the length of the horizontal portion 132 connected to the bottom surface of the cover plate 2. The length of the horizontal portion 132 can be flexibly adjusted, and this embodiment does not limit this.

[0043] See Figure 2 In some embodiments, the power battery further includes a sealing ring 3, which is disposed between the connecting portion 13 and the cover plate 2. The sealing ring 3 is disposed within the connecting groove 131 and is connected to the cover plate 2. In this embodiment, the sealing ring 3 is made of an insulating material. Two sides of the sealing ring 3 are respectively connected to the inner wall of the connecting groove 131 and the outer wall of the cover plate 2. The sealing ring 3 is disposed around the outer wall of the cover plate 2.

[0044] In this way, the sealing ring 3 can enhance the airtightness of the power battery, prevent electrolyte leakage, and make the connection between the connecting part 13 and the cover plate 2 tighter; setting the sealing ring 3 on the cover plate 2 and bending the connecting part 13 to cover the sealing ring 3 can improve assembly efficiency, ensure the connection stability between the shell 1 and the cover plate 2, and improve the yield of the power battery.

[0045] It can be understood that the material of the sealing ring 3 can be an elastic insulating material, such as a rubber material. The specific material of the sealing ring 3 can be flexibly adjusted according to actual needs, and it is sufficient to achieve insulation and sealing of the connection between the connecting part 13 and the cover plate 2. No further examples will be given here.

[0046] See Figure 2 In some embodiments, a lap block 21 is connected to the side wall of the cover plate 2, a sealing groove 31 is opened on the side of the sealing ring 3 facing the cover plate 2, the lap block 21 is arranged in the sealing groove 31, and the side wall of the cover plate 2 located below the lap block 21 is at least partially in contact with the inner wall of the side plate 11.

[0047] Among them, the overlapping block 21 is protruding from the side wall of the cover plate 2, and the thickness of the overlapping block 21 is less than the thickness of the cover plate 2. The top surface of the overlapping block 21 is flush with the top surface of the cover plate 2. The overlapping block 21 and the cover plate 2 are integrally formed and form a stepped structure, and the shape of the sealing groove 31 is adapted to the shape of the overlapping block 21, so that the sealing ring 3 is respectively in contact with the top surface, bottom surface and side surface of the overlapping block 21.

[0048] In this way, by setting the overlapping block 21 in the sealing groove 31, the cover plate 2 and the shell 1 can be stably connected, and the side wall of the cover plate 2 abuts against the inner wall of the side plate 11, which can further enhance the contact area between the shell 1 and the cover plate 2, thereby providing stable support for the cover plate 2 and improving the yield of the power battery. In addition, the sealing ring 3 is connected to the top, bottom and side surfaces of the overlapping block 21, which can improve the airtightness of the connection between the cover plate 2 and the shell 1, thereby enhancing the safety and stability of the power battery.

[0049] It is understandable that the shape of the lap block 21 and the shape of the sealing groove 31 can be flexibly adjusted according to actual needs, as long as the lap block 21 and the sealing ring 3 are stably connected. This embodiment does not limit this.

[0050] See Figure 3 In some embodiments, the sealing ring 3 includes a first portion 32, a second portion 33, and a third portion 34. The first portion 32, the second portion 33, and the third portion 34 enclose a sealing groove 31. The first portion 32 is connected to the top surface of the cover plate 2, the second portion 33 is connected to the side wall of the cover plate 2, and the third portion 34 is connected to the bottom surface of the cover plate 2. In this embodiment, the first portion 32 and the third portion 34 are arranged horizontally, and the second portion 33 is arranged vertically. The first portion 32, the second portion 33, and the third portion 34 are integrally formed.

[0051] In this way, the sealing ring 3 can achieve good sealing on the top, side and bottom surfaces of the abutment block, thereby enhancing the airtightness of the connection between the cover plate 2 and the shell 1, and facilitating the insertion of the sealing ring 3 into the abutment block to realize the assembly of the sealing ring 3, thereby improving the assembly efficiency and the safety of the power battery; under the action of the sealing ring 3, the connection between the cover plate 2 and the shell 1 is tighter, thereby improving the stability of the power battery.

[0052] It is understandable that the second portion 33 can also be set at an angle to the first portion 32 and the second portion 33. The shapes and settings of the first portion 32, the second portion 33 and the third portion 34 can be flexibly adjusted according to actual needs, and no further examples are given here.

[0053] See Figure 2 In some embodiments, the side of the sealing ring 3 facing the cover plate 2 is flush with the side of the connecting portion 13 facing the cover plate 2 .

[0054] In this way, after the sealing ring 3 is clamped with the overlapping block 21, the connecting portion 13 is bent and covers the sealing ring 3, which can make the shell 1 and the cover plate 2 tightly connected, and improve the structural strength of the connection between the shell 1 and the cover plate 2, enhance the pressure resistance and impact resistance of the power battery, and the sealing ring 3 is flush with the connecting portion 13, so that when the connecting portion 13 is set on the sealing ring 3, the sealing ring 3 and the overlapping block 21 are subjected to uniform force, thereby improving the airtightness and safety of the power battery.

[0055] It is understandable that the side of the sealing ring 3 facing the cover plate 2 can also be protruded from the side of the connecting portion 13 facing the cover plate 2, or the side of the connecting portion 13 facing the cover plate 2 can also be protruded from the side of the sealing ring 3 facing the cover plate 2. The lengths of the sealing ring 3 and the connecting portion 13 can be flexibly adjusted according to design requirements, and no further examples are given here.

[0056] See Figure 2 In some embodiments, a lower plastic member 22 is fixedly connected to the bottom surface of the cover plate 2, and the lower plastic member 22 is located within the accommodating cavity 14. In this embodiment, the length of the lower plastic member 22 is parallel to that of the cover plate 2, and the lower plastic member 22 is disposed on the side of the cover plate 2 facing the accommodating cavity 14. A pole 23 is also disposed on the cover plate 2, passing through the cover plate 2 and connected to the lower plastic member 22.

[0057] In this way, the lower plastic 22 can not only increase the structural strength, but also achieve electrical insulation to avoid short circuits.

[0058] See Figure 2 In some embodiments, the width of the lower plastic 22 is smaller than the width of the cover 2 .

[0059] In this way, when the housing 1 is assembled onto the cover 2 , it is unlikely to interfere with the lower plastic 22 , thereby improving assembly efficiency and assembly effect, and enhancing the stability and safety of the power battery.

[0060] It is understandable that the width of the lower plastic 22 may also be equal to the width of the cover 2 . Both the width of the lower plastic 22 and the width of the cover 2 can be flexibly adjusted, and no further details are given here.

[0061] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A power battery, characterized in that: include: A shell (1), the shell (1) comprising a side plate (11), a bottom plate (12) and a connecting portion (13), the side plate (11) and the bottom plate (12) enclosing to form a receiving cavity (14), the connecting portion (13) and the bottom plate (12) being fixedly arranged at both ends of the side plate (11), respectively, and a connecting groove (131) being provided on a side of the connecting portion (13) facing the receiving cavity (14); A cover plate (2), wherein the connecting portion (13) is arranged around the outer edge of the cover plate (2), and the side wall of the cover plate (2), at least a portion of the bottom surface of the cover plate (2), and at least a portion of the top surface of the cover plate (2) are all located in the connecting groove (131), so that the cover plate (2) is fixedly connected to the side plate (11); A battery core is arranged in the accommodating cavity (14).

2. The power battery according to claim 1, characterized in that: The connecting portion (13) comprises a horizontal portion (132) and a vertical portion (133). Two horizontal portions (132) are provided. The two horizontal portions (132) are provided at both ends of the vertical portion (133) and are respectively connected to the top surface of the cover plate (2) and the bottom surface of the cover plate (2). The vertical portion (133) is connected to the side wall of the cover plate (2). The horizontal portion (132) and the vertical portion (133) enclose and form a connecting groove (131).

3. The power battery according to claim 2, characterized in that: The two horizontal portions (132) of the connecting portion (13) have the same length.

4. The power battery according to claim 1, characterized in that: The power battery further comprises a sealing ring (3), wherein the sealing ring (3) is arranged between the connecting portion (13) and the cover plate (2), and the sealing ring (3) is arranged in the connecting groove (131) and connected to the cover plate (2).

5. The power battery according to claim 4, characterized in that: The side wall of the cover plate (2) is connected to a lap block (21); the sealing ring (3) is provided with a sealing groove (31) on a side facing the cover plate (2); the lap block (21) is arranged in the sealing groove (31); and the side wall of the cover plate (2) located below the lap block (21) at least partially abuts against the inner wall of the side plate (11).

6. The power battery according to claim 5, characterized in that: The sealing ring (3) comprises a first portion (32), a second portion (33) and a third portion (34); the first portion (32), the second portion (33) and the third portion (34) enclose and form the sealing groove (31); the first portion (32) is connected to the top surface of the cover plate (2); the second portion (33) is connected to the side wall of the cover plate (2); and the third portion (34) is connected to the bottom surface of the cover plate (2).

7. The power battery according to claim 4, characterized in that: The side of the sealing ring (3) facing the cover plate (2) is flush with the side of the connecting portion (13) facing the cover plate (2).

8. The power battery according to any one of claims 1 to 7, characterized in that: The bottom surface of the cover plate (2) is connected to a lower plastic (22), and the lower plastic (22) is located in the accommodating cavity (14).

9. The power battery according to claim 8, characterized in that: The width of the lower plastic (22) is smaller than the width of the cover plate (2).

10. The power battery according to any one of claims 1 to 7, characterized in that: The connecting portion (13) and the side plate (11) are integrally formed.

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