Battery shell and battery

Abstract

The invention belongs to the technical field of batteries, and discloses a battery shell and a battery, the battery shell comprises a shell assembly, a sealing assembly and a sealing element, the shell assembly comprises a shell body and a cover plate body, the wall surface, opposite to an opening, of the shell body and / or the cover plate body are / is provided with welding through holes used for welding tabs, and the sealing element is arranged in the welding through holes. The sealing assembly comprises a sealing plate provided with a second protruding structure, a welding seam is formed between the sealing plate and the shell body or the cover plate body, the first protruding structure and the second protruding structure jointly define a containing groove, the welding seam is located in the containing groove, and the sealing plate is connected with the shell body or the cover plate body. The sealing piece is formed in the containing groove in an injection molding mode. The sealing piece covering the welding seam is prepared in the containing groove through injection molding, so that on the basis of welding sealing, double sealing is achieved through the sealing piece, the sealing effect is greatly enhanced, external moisture is prevented from corroding internal devices, and the service life of a product is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery casing and a battery. Background Art

[0002] When assembling a traditional battery structure, the electrode group is usually first installed in the battery casing, and then the positive and negative ears of the electrode group are bent multiple times to form an approximate S shape. The cover assembly connected to the pole is then installed into the open part of the battery casing, and the pole ears of corresponding polarity are welded to the pole. After the welding of the pole ears and the pole is completed, the battery casing and the bare aluminum plate in the cover assembly are welded, and the battery casing is sealed to complete the assembly of the battery. However, after the battery of this structure is assembled, since the pole ears and the poles need to be welded first, and then the bare aluminum plate and the casing body can be welded, high temperature and vibration and other adverse factors will be generated when the bare aluminum plate and the casing body are welded, thereby affecting the welding quality between the pole ears and the poles.

[0003] Therefore, in order to improve the welding quality between the battery pole lug and the pole of the traditional structure, its structure is improved, so that an operating window for welding the pole lug is opened in advance on the bare aluminum plate, so that the welding operation of the pole lug can be placed after the welding of the bare aluminum plate and the outer shell body, thereby improving the welding quality. After the welding operation of the pole lug is completed, the metal plate and the bare aluminum plate are welded to complete the closing and sealing of the operating window.

[0004] However, when the welding metal plate is welded to the bare aluminum plate to close and seal the working window, since the weld formed by welding may have pores, there is a problem that external moisture enters the battery through the pores and corrodes the internal components. Therefore, if sealing is only done by welding, its sealing performance is poor and the product service life is short. Summary of the invention

[0005] The object of the present invention is to provide a battery casing and a battery with good sealing performance and long product service life.

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

[0007] In one aspect, a battery housing is provided, the battery housing comprising:

[0008] A shell assembly, the shell assembly comprising a shell body and a cover body, the shell body being provided with at least one opening, the cover body corresponding to the opening of the shell body one by one and used to close the opening of the shell body, the shell body having a wall opposite to the opening, and / or the cover body having a welding through hole for welding a pole ear, the shell body having a wall opposite to the opening, and / or the cover body having a first protrusion structure on a side away from the pole ear, the first protrusion structure being continuously arranged around the circumferential edge of the welding through hole;

[0009] A closing assembly, the closing assembly comprising a closing plate, a side of the closing plate facing away from the pole ear is provided with an annular second protruding structure, the closing plate is welded to the shell body and / or the cover body to close the welding through hole, and a weld is formed between the closing plate and the shell body or the cover body, the first protruding structure and the second protruding structure together enclose a receiving groove, and the weld is located in the receiving groove;

[0010] A sealing member is injection molded in the accommodating groove.

[0011] Optionally, the height dimension of the first protruding structure along the first direction is H1, the height dimension of the second protruding structure along the first direction is H2, the molding thickness of the seal along the first direction is T, and 0.3mm≤T≤min(H1, H2) is satisfied.

[0012] Optionally, the battery casing further includes a pole, one end of which is electrically connected to the pole lug, and the other end of which extends out of a wall of the casing body opposite to the opening or a surface of the cover body away from the pole lug, a height dimension of the pole extending along the first direction is H, and a height dimension H1 of the first protruding structure protruding along the first direction satisfies 0.5mm≤H1≤H.

[0013] Optionally, the battery casing further includes a pole, one end of which is electrically connected to the pole lug, and the other end of which extends out of a wall of the casing body opposite to the opening or a surface of the cover body away from the pole lug, a height dimension of the pole extending along the first direction is H, and a height dimension H2 of the second protruding structure protruding along the first direction satisfies 0.5mm≤H2≤H.

[0014] Optionally, the wall surface of the first protruding structure facing the second protruding structure is an inclined surface gradually approaching the second protruding structure from top to bottom;

[0015] And / or, the wall surface of the second protruding structure facing the first protruding structure is an inclined surface that gradually approaches the first protruding structure from top to bottom.

[0016] Optionally, the inclination angle of the inclined surface is θ, and satisfies 15°≤θ≤30°.

[0017] Optionally, the welding through hole is a stepped structure, including a first hole segment and a second hole segment, and a limiting step is formed between the first hole segment and the second hole segment, and the closing plate includes a closing portion and an inserting portion, the closing portion is inserted into the first hole segment and abuts against the limiting step, and the inserting portion is arranged on the side of the closing portion facing the limiting step and is inserted into the second hole segment.

[0018] Optionally, the closing assembly further comprises an insulating plate, wherein the insulating plate is arranged on a side of the closing plate facing the pole lug.

[0019] Optionally, the accommodating groove surrounded by the first protruding structure and the second protruding structure is in a track shape, a polygonal shape, an elliptical shape or a circular shape, and the sealing component injection-molded in the accommodating groove is adapted to the shape of the accommodating groove.

[0020] On the other hand, a battery is provided, comprising a pole group and a battery casing as described in any one of the above items, wherein the pole group is arranged in the battery casing.

[0021] Beneficial effects of the present invention:

[0022] The present invention provides a battery shell, which comprises a first protrusion structure continuously arranged around the circumferential edge of a welding through hole on a wall surface opposite to an opening of a shell body, and / or a side of a cover body opposite to a pole ear, and a second annular protrusion structure is arranged on a side of a closing plate for closing the welding through hole opposite to the pole ear, thereby forming an accommodating groove covering a weld between a closing plate and a shell body or a cover body, and a sealing member is prepared by injection molding in the accommodating groove, thereby covering the weld with the sealing member, and sealing the weld with the sealing member on the basis of sealing and sealing the closing plate and the shell body or the cover body by welding, thereby achieving double sealing, greatly enhancing the sealing effect, preventing external moisture from corroding internal components, and extending the service life of the product.

[0023] The present invention also provides a battery, which, by applying the battery shell, ensures the sealing of the welding through hole after the sealing plate is welded, avoids the corrosion of the insulating plate, prolongs the service life of the product, and improves the quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural cross-sectional view of the battery housing closure assembly, the sealing member and the cover plate body provided by the present invention;

[0025] Figure 2yes Figure 1 A magnified view of the structure of part A;

[0026] Figure 3 It is a structural cross-sectional view of the battery housing closure assembly, the seal and the housing body provided by the present invention;

[0027] Figure 4 yes Figure 3 A magnified view of the structure of part B;

[0028] Figure 5 It is a structural exploded view of the battery provided by the present invention.

[0029] In the figure:

[0030] 100, weld; 200, pole ear; 300, pole group;

[0031] 1. Shell assembly; 11. Shell body; 12. Cover body; 13. First protruding structure;

[0032] 2. Closing assembly; 21. Closing plate; 211. Second protruding structure; 212. Closing portion; 213. Connecting portion; 22. Insulating plate;

[0033] 3. Seals;

[0034] 4. Pole. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0036] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 invention can be understood according to specific circumstances.

[0037] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, 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 limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0039] When the metal plate is welded to the bare aluminum plate to close and seal the working window, the weld formed by welding may have pores, which may cause the external moisture to corrode the internal components through the pores.

[0040] Therefore, in order to improve the sealing performance after sealing and extend the service life of the product, this embodiment provides a battery housing.

[0041] like Figures 1 to 5 As shown, the battery shell includes a shell assembly 1, a sealing assembly 2 and a sealing member 3, the shell assembly 1 includes a shell body 11 and a cover body 12, the shell body 11 is provided with at least one opening, the cover body 12 corresponds to the opening of the shell body 11 one by one, and is used to close the opening of the shell body 11, the shell body 11 and the wall opposite to the opening, and / or the cover body 12 are provided with welding through holes for welding the pole ear 200, the shell body 11 and the wall opposite to the opening, and / or the cover body 12 are further provided with a first protrusion structure 13 on the side away from the pole ear 200, The first protrusion structure 13 is continuously arranged around the circumferential edge of the welding through hole, and the closing component 2 includes a closing plate 21. The side of the closing plate 21 away from the pole ear 200 is provided with an annular second protrusion structure 211. The closing plate 21 is welded to the shell body 11 and / or the cover body 12 to close the welding through hole, and a weld 100 is formed between the closing plate 21 and the shell body 11 or the cover body 12. The first protrusion structure 13 and the second protrusion structure 211 together enclose a receiving groove, the weld 100 is located in the receiving groove, and the seal 3 is injection molded in the receiving groove.

[0042] The battery shell is provided with a first protrusion structure 13 continuously arranged around the circumferential edge of the welding through hole on the wall surface of the shell body 11 opposite to the opening, and / or on the side of the cover body 12 away from the pole ear 200, and a ring-shaped second protrusion structure 211 is provided on the side of the closing plate 21 used for closing the welding through hole away from the pole ear 200, thereby forming an accommodating groove covering the weld 100 between the closing plate 21 and the shell body 11 or the cover body 12, and a sealing member 3 is prepared by injection molding in the accommodating groove, so that the weld 100 is covered by the sealing member 3, and on the basis of sealing and sealing by welding the closing plate 21 to the shell body 11 or the cover body 12, the weld 100 is sealed by the sealing member 3, thereby achieving double sealing, greatly enhancing the sealing effect, preventing external moisture from corroding internal devices, and extending the service life of the product.

[0043] Among them, the battery shell can be adapted to different types of batteries, such as blade batteries or square shell batteries. In addition, the battery shell can be formed into blade batteries or square shell batteries of various structures by the number of openings of the shell body 11 and the number of cover bodies 12, such as: a blade battery with a shell body 11 with double-sided openings and a double cover body 12, or a blade battery with a shell body 11 with a single-sided window and a single cover body 12, or a square shell battery with a shell body 11 with a single-sided window and a single cover body 12, etc., and the welding through holes can be set separately on the shell body 11, or separately on the cover body 12, or welding through holes can be set on both the cover body 12 and the shell body 11. In this embodiment, the specific structure of the battery shell is a square blade cell shell with a shell body 11 with double-sided windows and a double cover body 12, wherein the welding through holes are opened on the cover body 12, and no welding through holes are opened on the shell body 11.

[0044] Alternatively, if Figure 2 , Figure 4 As shown, the height dimension of the first protruding structure 13 protruding along the first direction is H1, the height dimension of the second protruding structure 211 protruding along the first direction is H2, and the molding thickness of the seal 3 along the first direction is T, and it satisfies 0.3mm≤T≤min(H1, H2). By limiting the thickness T of the seal 3 along the first direction to satisfy 0.3mm≤T≤min(H1, H2), on the one hand, it is made greater than 0.3mm to avoid the molding thickness being too small, resulting in poor sealing performance, and on the other hand, it is made smaller than the minimum value between the height dimension H1 of the first protruding structure 13 protruding along the first direction and the height dimension H2 of the second protruding structure 211 protruding along the first direction, so as to avoid the molded seal 3 overflowing the accommodating groove.

[0045] Alternatively, if Figure 2 , Figure 4As shown, the battery housing also includes a pole 4, one end of which is electrically connected to the pole lug 200, and the other end of which extends out of the wall of the housing body 11 opposite to the opening or the surface of the cover body 12 away from the pole lug 200. The height dimension of the pole 4 extending in the first direction is H, and the height dimension H1 of the first protruding structure 13 protruding in the first direction satisfies 0.5mm≤H1≤H. By limiting the height dimension H1 of the first protruding structure 13 protruding in the first direction to satisfy 0.5mm≤H1≤H, on the one hand, it is prevented that the height of the first protruding structure 13 is too low, and an insulating member with a thickness that meets the requirements cannot be formed, and on the other hand, it is prevented that the height of the first boss is too large, exceeding the height of the pole 4 extending out, resulting in interference with the connection and assembly between the pole 4 and the busbar.

[0046] Alternatively, if Figure 2 , Figure 4 As shown, the battery housing also includes a pole 4, one end of which is electrically connected to the pole lug 200, and the other end of which extends out of the wall of the housing body 11 opposite to the opening or the surface of the cover body 12 away from the pole lug 200. The height dimension of the pole 4 extending in the first direction is H, and the height dimension H2 of the second protruding structure 211 protruding in the first direction satisfies 0.5mm≤H2≤H. By limiting the height dimension H1 of the first protruding structure 13 protruding in the first direction to satisfy 0.5mm≤H1≤H, on the one hand, it is prevented that the height of the second protruding structure 211 is too low, and an insulating member with a thickness that meets the requirements cannot be formed, and on the other hand, it is prevented that the height of the second boss is too large, exceeding the height of the pole 4 extending out, resulting in interference with the connection and assembly between the pole 4 and the busbar.

[0047] Alternatively, if Figure 2 , Figure 4 As shown, the wall surface of the first protruding structure 13 facing the second protruding structure 211 is an inclined surface that gradually approaches the second protruding structure 211 from top to bottom. By making the wall surface of the first protruding structure 13 facing the second protruding structure 211 gradually approach the second protruding structure 211 from top to bottom, when the glue is injected, it has a tendency to gather toward the weld 100, thereby ensuring the sealing effect on the weld 100.

[0048] Alternatively, if Figure 2 , Figure 4 As shown, the wall surface of the second protruding structure 211 facing the first protruding structure 13 is an inclined surface that gradually approaches the first protruding structure 13 from top to bottom. By making the wall surface of the second protruding structure 211 facing the first protruding structure 13 gradually approach the inclined surface of the first protruding structure 13 from top to bottom, when the glue is injected, it has a tendency to gather toward the weld 100, thereby ensuring the sealing effect on the weld 100.

[0049] Alternatively, if Figure 2 , Figure 4 As shown, the inclination angle of the inclined plane is θ, and satisfies 15°≤θ≤30°. By limiting the inclination angle of the inclined plane, on the one hand, it is avoided that the inclination angle is too small, which leads to a too slow tendency of gathering during injection and reduces the efficiency of injection molding, and on the other hand, it is avoided that the inclination angle is too large, which leads to compression of the available space of the accommodating groove, reduces the volume of the sealing member 3 after molding, and weakens the sealing effect.

[0050] The inclination angle θ of the inclined surface may be any value between 15° and 30° or a range between any two values, such as 15°, 20°, 25°, 30°, etc.

[0051] Optionally, the welding through hole is a stepped structure, including a first hole segment and a second hole segment, and a limiting step is formed between the first hole segment and the second hole segment. The closing plate 21 includes a closing portion 212 and a plug-in portion 213. The closing portion 212 is inserted in the first hole segment and abuts against the limiting step. The plug-in portion 213 is arranged on the side of the closing portion 212 facing the limiting step and is inserted in the second hole segment. By providing a sealing portion inserted in the first hole segment on the closing plate 21, and providing a plug-in portion 213 inserted in the second hole segment, the contact area of ​​the closing plate 21 is increased, and the sealing of the welding through hole is improved. In this embodiment, the closing portion 212 and the plug-in portion 213 of the closing plate 21 can be manufactured by an integrated molding process, or the closing portion 212 and the plug-in portion 213 can be manufactured separately and then welded.

[0052] Alternatively, if Figure 2 , Figure 4 As shown, the closing assembly 2 further includes an insulating plate 22, which is disposed on the side of the closing plate 21 facing the pole lug 200. By arranging an insulating portion on the side of the closing plate 21 facing the pole lug 200, the pole lug 200 is insulated and protected, thereby preventing the pole lug 200 from accidentally touching the closing plate 21 and causing a short circuit, thereby improving the safety of use.

[0053] Optionally, the receiving groove surrounded by the first protruding structure 13 and the second protruding structure 211 is in the shape of a racetrack, polygon, ellipse or circle, and the sealing member 3 injection-molded in the receiving groove is adapted to the shape of the receiving groove. By making the receiving groove surrounded by the first protruding structure 13 and the second protruding structure 211 in the shape of a racetrack, polygon, ellipse or circle, etc., sealing members 3 of different shapes can be formed during injection molding to adapt to welds 100 of different welding trajectories, thereby ensuring the sealing effect of the weld 100.

[0054] In this embodiment, if Figure 5As shown, a battery is also provided, the battery includes an electrode group 300 and the above-mentioned battery shell, and the electrode group 300 is arranged in the battery shell. By using the above-mentioned battery shell, the battery ensures the sealing of the welding through hole after the sealing plate 21 is welded, avoids the corrosion of the insulating plate 2222, prolongs the service life of the product, and improves the quality of the product.

[0055] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A battery housing, characterized in that: The battery housing comprises: A shell assembly, the shell assembly comprising a shell body and a cover body, the shell body being provided with at least one opening, the cover body corresponding to the opening of the shell body one by one and used to close the opening of the shell body, the shell body having a wall opposite to the opening, and / or the cover body having a welding through hole for welding a pole ear, the shell body having a wall opposite to the opening, and / or the cover body having a first protrusion structure on a side away from the pole ear, the first protrusion structure being continuously arranged around the circumferential edge of the welding through hole; A closing assembly, the closing assembly comprising a closing plate, a side of the closing plate facing away from the pole ear is provided with an annular second protruding structure, the closing plate is welded to the shell body and / or the cover body to close the welding through hole, and a weld is formed between the closing plate and the shell body or the cover body, the first protruding structure and the second protruding structure together enclose a receiving groove, and the weld is located in the receiving groove; A sealing member is injection molded in the accommodating groove.

2. The battery housing according to claim 1, characterized in that: The height dimension of the first protruding structure protruding along the first direction is H1, the height dimension of the second protruding structure protruding along the first direction is H2, the molding thickness of the seal along the first direction is T, and satisfies 0.3mm≤T≤min(H1, H2).

3. The battery housing according to claim 2, characterized in that: The battery casing also includes a pole, one end of which is electrically connected to the pole lug, and the other end of the pole extends out from the wall of the casing body opposite to the opening or the surface of the cover body away from the pole lug, the height dimension of the pole extending along the first direction is H, and the height dimension H1 of the first protrusion structure protruding along the first direction satisfies 0.5mm≤H1≤H.

4. The battery housing according to claim 2, characterized in that: The battery casing also includes a pole, one end of which is electrically connected to the pole lug, and the other end of the pole extends out from the wall of the casing body opposite to the opening or the surface of the cover body away from the pole lug, the height dimension of the pole extending along the first direction is H, and the height dimension of the second protrusion structure protruding along the first direction is H2, which satisfies 0.5mm≤H2≤H.

5. The battery housing according to claim 1, characterized in that: The wall surface of the first protrusion structure facing the second protrusion structure is an inclined surface gradually approaching the second protrusion structure from top to bottom; And / or, the wall surface of the second protruding structure facing the first protruding structure is an inclined surface that gradually approaches the first protruding structure from top to bottom.

6. The battery housing according to claim 5, characterized in that: The inclination angle of the inclined surface is θ, and satisfies 15°≤θ≤30°.

7. The battery housing according to claim 1, characterized in that: The welding through hole is a stepped structure, including a first hole segment and a second hole segment, and a limiting step is formed between the first hole segment and the second hole segment. The closing plate includes a closing portion and an inserting portion. The closing portion is inserted into the first hole segment and abuts against the limiting step. The inserting portion is arranged on the side of the closing portion facing the limiting step and is inserted into the second hole segment.

8. The battery housing according to claim 1, characterized in that: The closing assembly further comprises an insulating plate, and the insulating plate is arranged on a side of the closing plate facing the pole ear.

9. The battery housing according to claim 1, characterized in that: The accommodating groove surrounded by the first protruding structure and the second protruding structure is in a racetrack shape, a polygonal shape, an elliptical shape or a circular shape, and the sealing component injection-molded in the accommodating groove is adapted to the shape of the accommodating groove.

10. A battery, characterized in that The battery comprises a pole group and a battery casing as claimed in any one of claims 1 to 9, wherein the pole group is arranged in the battery casing.

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