Battery casing and battery

Abstract

The present invention belongs to the field of battery technology and discloses a battery housing and a battery. The battery housing includes a shell assembly, a closure assembly, and a seal. The shell assembly includes a shell body and a cover body. The shell body and the wall opposite to the opening, and / or the cover body are provided with a welding through-hole for welding the electrode lug, and a first protrusion structure is continuously provided around the circumferential edge of the welding through-hole. The closure assembly includes a closure plate provided with a second protrusion structure. A weld is formed between the closure plate and the shell body or the cover body. The first protrusion structure and the second protrusion structure together enclose a receiving groove. The weld is located in the receiving groove, and the seal is injection molded in the receiving groove. By preparing a seal covering the weld by injection molding in the receiving groove, a double seal is achieved by using the seal on the basis of the welding seal, which greatly enhances the sealing effect, prevents external moisture from corroding the internal components, and extends the service life of the product.

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 electrode ears of the electrode group are bent multiple times to form an approximate S shape. The cover assembly connected to the electrode column is then installed into the opening of the battery casing, and the electrode ears of corresponding polarity are welded to the electrode column. After the electrode ears and the electrode column are welded, 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 assembly of the battery with this structure, since the electrode ears and the electrode column need to be welded first, and then the bare aluminum plate and the casing body can be welded, the welding of the bare aluminum plate and the casing body will generate adverse factors such as high temperature and vibration, thereby affecting the welding quality between the electrode ears and the electrode column.

[0003] Therefore, in order to improve the welding quality between the battery tabs and the poles of the traditional structure, its structure is improved, so that an operating window for welding the tabs is opened in advance on the bare aluminum plate, so that the welding operation of the tabs can be placed after the welding of the bare aluminum plate and the shell body, thereby improving the welding quality. After the welding operation of the tabs 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 metal plate is welded to the bare aluminum plate to close and seal the working window, there is a possibility of pores in the weld formed by welding. There is a problem that external moisture enters the battery through the pores and corrodes the internal components. Therefore, if only welding is used for sealing, 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, comprising:

[0008] A shell assembly, the shell assembly comprising a shell body and a cover body, the shell body having at least one opening, the cover body corresponding one-to-one with the opening of the shell body 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 the tab, the shell body having a wall opposite to the opening and / or the cover body having a first protrusion on a side facing away from the tab, the first protrusion being continuously arranged around the circumferential edge of the welding through-hole;

[0009] A closing assembly, the closing assembly comprising a closing plate, the closing plate having a second annular protrusion structure provided on a side facing away from the tab, the closing plate being welded to the shell body and / or the cover body to close the welding through-hole and forming a weld between the closing plate and the shell body or the cover body, the first protrusion structure and the second protrusion structure jointly enclosing a receiving groove, the weld being located within 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 satisfies 0.3mm≤T≤min(H1, H2).

[0012] Optionally, the battery casing further includes a pole, one end of which is electrically connected to the tab, and the other end of which extends out of the wall of the casing body opposite to the opening or the surface of the cover body away from the tab, and the height dimension of the pole extending along the first direction is H, and the 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 tab, and the other end of which extends out of the wall of the casing body opposite to the opening or the surface of the cover body away from the tab, the height dimension of the pole extending along the first direction is H, and the 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. 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 provided 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 includes an insulating plate, which is arranged on a side of the closing plate facing the tab.

[0019] Optionally, the accommodating groove formed by the first protruding structure and the second protruding structure is in the shape of a racetrack, a polygon, an ellipse or a circle, 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 disposed in the battery casing.

[0021] Beneficial effects of the present invention:

[0022] The present invention provides a battery shell, which is provided with a first protrusion structure continuously arranged around the circumferential edge of the welding through-hole on the wall surface opposite to the opening of the shell body, and / or on the side of the cover body away from the pole ear, and a ring-shaped second protrusion structure is provided on the side of the closing plate for closing the welding through-hole away from the pole ear, thereby forming an accommodating groove covering the weld between the closing plate and the shell body or the cover body, and preparing a sealing member by injection molding in the accommodating groove, so as to cover the weld with the sealing member, and on the basis of sealing and sealing by welding the closing plate and the shell body or the cover body, the weld is sealed with the sealing member, 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 uses the above-mentioned battery shell to ensure the sealing of the welding through hole after the closing plate is welded, avoids corrosion of the insulating plate, extends the service life of the product, and improves the quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0026] Figure 3 This is a structural cross-sectional view of the assembly 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 picture:

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

[0031] 1. Shell assembly; 11. Shell body; 12. Cover body; 13. First protrusion 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 with reference to the accompanying drawings and examples. It will 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 structures.

[0036] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and 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 the present invention in specific circumstances.

[0037] 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. Furthermore, 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.

[0038] 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, 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 meanings.

[0039] When the metal plate is welded to the bare aluminum plate to close and seal the working window, the weld formed by the welding may have pores, which may cause external moisture to corrode 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 housing includes a housing assembly 1, a closure assembly 2 and a seal 3. The housing assembly 1 includes a housing body 11 and a cover body 12. The housing body 11 is provided with at least one opening. The cover body 12 corresponds to the opening of the housing body 11 one by one and is used to close the opening of the housing body 11. The wall of the housing body 11 opposite to the opening and / or the cover body 12 are provided with welding through holes for welding the tab 200. The wall of the housing body 11 opposite to the opening and / or the cover body 12 are further provided with a first protrusion structure 13 on the side facing away from the tab 200. The first protrusion structure 13 is continuously arranged around the circumferential edge of the welding through hole. The closing assembly 2 includes a closing plate 21. A ring-shaped second protrusion structure 211 is provided on the side of the closing plate 21 facing away from the pole ear 200. The closing plate 21 is welded to the shell body 11 and / or the cover body 12 to close the welding through hole and form a weld 100 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 form an accommodating groove. The weld 100 is located in the accommodating groove, and the seal 3 is injection molded in the accommodating 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 opposite to the opening of the shell body 11, 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 for closing the welding through hole away from the pole ear 200, thereby forming a receiving groove covering the weld 100 between the closing plate 21 and the shell body 11 or the cover body 12, and preparing a sealing member 3 by injection molding in the receiving groove, so as to cover the weld 100 with 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 welding member 100 is sealed with the sealing member 3, thereby achieving double sealing, greatly enhancing the sealing effect, preventing external moisture from corroding internal components, 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 configured into blade batteries or square shell batteries of various structures by adjusting 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, as Figure 2 、 Figure 4 As shown, the height dimension of the first protruding structure 13 along the first direction is H1, the height dimension of the second protruding structure 211 along the first direction is H2, and the molded thickness of the seal 3 along the first direction is T, and they satisfy 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 greater than 0.3mm to avoid the molded thickness being too small, resulting in poor sealing performance. On the other hand, it is less than the minimum value between the height dimension H1 of the first protruding structure 13 along the first direction and the height dimension H2 of the second protruding structure 211 along the first direction, to prevent the molded seal 3 from overflowing the accommodating groove.

[0045] Alternatively, as Figure 2 、 Figure 4As shown, the battery housing further includes a terminal post 4, one end of which is electrically connected to the terminal tab 200, and the other end of which extends beyond the wall of the housing body 11 opposite the opening or the surface of the cover body 12 facing away from the terminal tab 200. The height dimension H of the terminal post 4 extending in the first direction is extended, and the height dimension H1 of the first protruding structure 13 extending in the first direction satisfies 0.5 mm ≤ H1 ≤ H. By limiting the height dimension H1 of the first protruding structure 13 extending in the first direction to satisfy 0.5 mm ≤ H1 ≤ H, this prevents the height of the first protruding structure 13 from being too low, thereby preventing the formation of an insulating member with the required thickness. Furthermore, it prevents the height of the first boss from being too large, thereby exceeding the extended height of the terminal post 4 and interfering with the connection and assembly between the terminal post 4 and the busbar.

[0046] Alternatively, as Figure 2 、 Figure 4 As shown, the battery housing further includes a terminal post 4, one end of which is electrically connected to the terminal tab 200, and the other end of which extends beyond the wall of the housing body 11 opposite the opening or the surface of the cover body 12 facing away from the terminal tab 200. The height dimension H of the terminal post 4 extending in the first direction is the same as the height dimension H2 of the second protruding structure 211 extending in the first direction, satisfying 0.5 mm ≤ H2 ≤ H. By limiting the height dimension H1 of the first protruding structure 13 extending in the first direction to satisfy 0.5 mm ≤ H1 ≤ H, this prevents the second protruding structure 211 from being too low, thereby preventing the formation of an insulating member with the required thickness. Furthermore, it prevents the second boss from being too high, exceeding the height of the terminal post 4, and interfering with the connection and assembly between the terminal post 4 and the busbar.

[0047] Alternatively, as Figure 2 、 Figure 4 As shown, the wall surface of the first protrusion structure 13 facing the second protrusion structure 211 is an inclined surface that gradually approaches the second protrusion structure 211 from top to bottom. By making the wall surface of the first protrusion structure 13 facing the second protrusion structure 211 an inclined surface that gradually approaches the second protrusion structure 211 from top to bottom, the glue tends to converge toward the weld 100 during injection, thereby ensuring a sealing effect on the weld 100.

[0048] Alternatively, as Figure 2 、 Figure 4 As shown, the wall surface of the second protrusion structure 211 facing the first protrusion structure 13 is an inclined surface that gradually approaches the first protrusion structure 13 from top to bottom. By making the wall surface of the second protrusion structure 211 facing the first protrusion structure 13 an inclined surface that gradually approaches the first protrusion structure 13 from top to bottom, the second protrusion structure 211 tends to converge toward the weld 100 during glue injection, thereby ensuring a sealing effect on the weld 100.

[0049] Alternatively, as Figure 2 、 Figure 4 As shown, the angle of inclination of the inclined surface is θ, and satisfies 15°≤θ≤30°. By limiting the inclination angle of the inclined surface, on the one hand, it is avoided that the inclination angle is too small, which will lead to a slow trend of gathering during injection and reduce the efficiency of injection molding. On the other hand, it is avoided that the inclination angle is too large, which will compress the available space of the accommodating groove, reduce the volume of the seal 3 after molding, and weaken the sealing effect.

[0050] The inclination angle θ of the inclined surface can 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 into the first hole segment and abuts against the limiting step. The plug-in portion 213 is provided on the side of the closing portion 212 facing the limiting step and is inserted into the second hole segment. By providing a sealing portion inserted into the first hole segment and providing a plug-in portion 213 inserted into the second hole segment on the closing plate 21, 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 through an integrated molding process, or the closing portion 212 and the plug-in portion 213 can be manufactured separately and then welded.

[0052] Alternatively, as Figure 2 、 Figure 4 As shown, the sealing assembly 2 further includes an insulating plate 22, which is provided on the side of the sealing plate 21 facing the tab 200. By providing an insulating portion on the side of the sealing plate 21 facing the tab 200, the tab 200 is insulated and protected, thereby preventing the tab 200 from accidentally touching the sealing plate 21 and causing a short circuit, thereby improving safety in use.

[0053] Optionally, the receiving groove formed by the first protrusion structure 13 and the second protrusion 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 formed by the first protrusion structure 13 and the second protrusion structure 211 in the shape of a racetrack, polygon, ellipse, or circle, etc., different shapes of sealing members 3 can be formed during injection molding to adapt to welds 100 with different welding trajectories, thereby ensuring a sealing effect on the weld 100.

[0054] In this embodiment, if Figure 5As shown, a battery is also provided, comprising an electrode assembly 300 and the aforementioned battery housing, wherein the electrode assembly 300 is disposed within the battery housing. By utilizing the aforementioned battery housing, the battery ensures the sealing of the welding through-holes after welding of the sealing plate 21, prevents corrosion of the insulating plate 2222, extends the product life, and improves product quality.

[0055] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. 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 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 having at least one opening, the cover body corresponding one-to-one with the opening of the shell body 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 the tab, the shell body having a wall opposite to the opening and / or the cover body having a first protrusion on a side facing away from the tab, the first protrusion being continuously arranged around the circumferential edge of the welding through-hole; A closing assembly, the closing assembly comprising a closing plate, the closing plate having a second annular protrusion structure provided on a side facing away from the tab, the closing plate being welded to the shell body and / or the cover body to close the welding through-hole and forming a weld between the closing plate and the shell body or the cover body, the first protrusion structure and the second protrusion structure jointly enclosing a receiving groove, the weld being located within the receiving groove; A sealing member is injection-molded in the accommodating groove.

2. The battery housing according to claim 1, wherein: 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 satisfies 0.3mm≤T≤min(H1, H2).

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

5. The battery housing according to claim 1, wherein: 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, wherein: 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 provided 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, wherein: The closing assembly further includes an insulating plate, which is arranged on a side of the closing plate facing the tab.

9. The battery housing according to claim 1, wherein: The accommodating groove formed by the first protruding structure and the second protruding structure is in the shape of a racetrack, a polygon, an ellipse or a circle, 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 according to any one of claims 1 to 9, wherein the pole group is arranged in the battery casing.

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