Battery shell and single battery

Abstract

The utility model relates to the technical field of batteries, in particular to a battery shell and a single battery. The battery shell comprises a shell main body and a cover body, an opening is formed in the preset end part of the shell main body, and a first chamfer is arranged on the inner edge of the preset end part of the shell main body; the cover body comprises a cover part and an insertion part connected with the cover part in a step shape; the cover part is in lap joint with the preset end of the shell body, the insertion part is in inserted connection with the inner wall of the shell body, and the first chamfer is opposite to the root of the step. The single battery comprises the battery shell. According to the battery shell and the single battery, the first chamfer is arranged at the inner edge of the opening of the shell main body, so that metal wires or metal chips generated by scraping can be effectively avoided, and the risk of short circuit between the electrode assembly and the metal wires or metal chips falling into the accommodating cavity due to scraping is reduced; therefore, the use safety of the single battery using the battery shell is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery housing and a single battery. Background Art

[0002] The interior of the battery housing forms a sealed cavity to accommodate and protect the battery. The battery housing generally includes a cover and a rectangular housing, and the cover is mainly assembled and positioned with the housing by its assembly steps.

[0003] Currently, if Figure 1 As shown, the assembly step 1 of the cover is provided with a straight chamfer 10, as shown in FIG. Figure 2 As shown, the top cross section of the housing 2 is a right angle, so Figure 3 As shown, during the assembly process of the cover 1 and the shell 2, the top of the shell 2 and the assembly step 10 of the cover 1 will be scratched, and metal chips or metal wires generated during the scratching process will fall into the inside of the shell 1, causing abnormalities such as short circuit of the battery cells inside the shell 1. Utility Model Content

[0004] The purpose of the present application is to provide a battery casing and a single cell, so as to solve to a certain extent the technical problems existing in the prior art that the cover and the casing are easily scratched during the assembly process, and metal chips or metal wires generated during the scratching process fall into the casing and easily cause battery short circuit and other abnormalities.

[0005] The present application provides a battery housing, comprising a housing body and a cover body;

[0006] An opening is provided at a predetermined end of the shell body, and a first chamfer is provided at an inner edge of the shell body at the opening;

[0007] The cover body comprises a cover portion and an insertion portion connected to the cover portion in a stepped shape;

[0008] The cover portion is overlapped with a predetermined end portion of the shell body, the insertion portion is plugged into an inner wall of the shell body, and the first chamfer is opposite to the root of the step.

[0009] In the above technical solution, further, a second chamfer is provided at the root of the step, and the first chamfer is adaptively engaged with the second chamfer.

[0010] In any of the above technical solutions, further, the first chamfer and the second chamfer are both round chamfers.

[0011] In any of the above technical solutions, further, the wall thickness of the shell body is m, the radius of the first chamfer and the second chamfer is R, and the relationship between the wall thickness m and the radius R is:

[0012] 0<R≤m, wherein the measurement unit of R and the measurement unit of m are both millimeters.

[0013] In any of the above technical solutions, further, the first chamfer and the second chamfer are both straight chamfers.

[0014] In any of the above technical solutions, further, the length of one of the right-angled sides of the first chamfer and the second chamfer is n, the wall thickness of the shell body is m, and the relationship between the wall thickness m and the right-angled side length n is:

[0015] 0<n<(m-0.05), where the unit of n is millimeter.

[0016] In any of the above technical solutions, further, m≥0.3.

[0017] In any of the above technical solutions, further, the first chamfer and the second chamfer are welded;

[0018] And / or, the inserting portion is welded to the inner wall of the shell body;

[0019] And / or, the cover body is welded to the end surface of the shell body at the opening.

[0020] In any of the above technical solutions, further, an outer edge of the end of the insertion portion away from the cover portion is provided with a third chamfer;

[0021] The third chamfer is a round chamfer or a straight chamfer.

[0022] The present application also provides a single cell battery, comprising the battery housing described in any of the above technical solutions.

[0023] Compared with the prior art, the beneficial effects of this application are:

[0024] The battery case provided by the present application includes a cover body and a case body, wherein the inner edge of the case body at the opening is provided with a first chamfer, and the cover body includes an insertion portion and a cover portion connected in a stepped shape, wherein the root of the step is opposite to the first chamfer. Thus, when the insertion portion is assembled into the interior of the case body, it is possible to effectively avoid scratching between the inner edge of the case body at the opening and the end of the insertion portion away from the cover portion.

[0025] It can be seen that the battery shell can effectively avoid the generation of metal wires or metal chips due to scratching by setting a first chamfer on the inner edge of the shell body at the opening, thereby reducing the risk of short circuit between the electrode assembly and the metal wires or metal chips that fall into the accommodating cavity due to scratching, thereby improving the safety of the single battery used in the battery shell.

[0026] The single cell provided in the present application includes the above-mentioned battery casing, and thus can achieve all the beneficial effects of the battery casing. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 It is a structural schematic diagram of a plate of a battery housing in the related art;

[0029] Figure 2 It is a schematic diagram of the structure of a battery housing in the related art in an assembled state;

[0030] Figure 3 It is a structural schematic diagram of a battery housing in the assembly process in the related art;

[0031] Figure 4 A first structural schematic diagram of a battery housing provided in Example 1 of the present application;

[0032] Figure 5 for Figure 4 A local enlarged schematic diagram at point A;

[0033] Figure 6 for Figure 4 A schematic structural diagram of a shell body of a battery shell;

[0034] Figure 7 for Figure 6 A local enlarged schematic diagram at B;

[0035] Figure 8 for Figure 4 A schematic structural diagram of a cover body of a battery housing;

[0036] Fig. 9 for Figure 8 A partial enlarged view at C;

[0037] Fig.10 A second structural schematic diagram of a battery housing provided in Example 1 of the present application;

[0038] Fig.11 for Fig.10 A local enlarged view at D;

[0039] Fig.12 for Fig.10 A schematic structural diagram of a shell body of a battery shell;

[0040] Fig.13 for Fig.12 A local enlarged view at E;

[0041] Fig.14 for Fig.10 A schematic structural diagram of a cover body of a battery housing;

[0042] Fig.15 for Fig.14 A partial enlarged view at F.

[0043] Figures 1 to 3 Reference numerals:

[0044] 1-assembly step; 10-straight chamfer; 2-housing.

[0045] Figures 4 to 13 Reference numerals:

[0046] 3-battery housing; 30-housing body; 300-opening; 301-first chamfer; 302-end face; 303-inner wall; 31-cover body; 310-cover portion; 311-insertion portion; 312-second chamfer; 313-third chamfer. DETAILED DESCRIPTION

[0047] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0048] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0049] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] Embodiment 1

[0051] See also Figures 4 to 15 As shown, an embodiment of the present application provides a battery housing 3 for accommodating and protecting an electrode assembly of a single battery.

[0052] The battery housing 3 provided in this embodiment includes a housing body 30 and a cover body 31 .

[0053] The shell body 30 is provided with an opening 300 at a predetermined end, and the shell body 30 is provided with a first chamfer 301 at the inner edge of the opening 300. Specifically, the shell body 30 has an internal accommodating cavity, and the opening 300 is connected to the accommodating cavity. The electrode assembly can be placed in the accommodating cavity through the opening 300, so that the electrode assembly is accommodated by the shell body 30. The predetermined end of the shell body 30 is formed with an inner edge close to the accommodating cavity and an outer edge close to the outside at the opening 300, and the first chamfer 301 is provided at the inner edge of the shell body 30.

[0054] The cover body 31 includes an inserting portion 311 and a cover portion 310 connected in a stepped shape, see Figure 8 , Fig. 9 , Fig.14 and Fig.15 As shown, the dotted line roughly shows the boundary line between the cover portion 310 and the insertion portion 311, that is, the connection position between the two. It can be seen that the two are connected in a stepped shape, and the connection position between the two is located at the root of the step.

[0055] The cover portion 310 overlaps the predetermined end of the shell body 30, and the insertion portion 311 is plugged into the inner wall 303 of the shell body 30, so that the opening 300 of the predetermined end of the shell body 30 is blocked by the insertion portion 311 and the cover portion 310, thereby sealing the accommodating cavity relative to the outside.

[0056] Specifically, the insertion portion 311 is adaptively plugged into the inner wall 303 of the shell body 30 , and the cover portion 310 is fitted with the end face 302 of the predetermined end of the shell body 30 , so that the cover portion 310 seals the connection seam between the insertion portion 311 and the inner wall 303 of the shell body 30 .

[0057] The first chamfer 301 is opposite to the root of the step, so that when the insertion part 311 is assembled into the inside of the shell body 30, it can effectively avoid the inner edge of the shell body 30 at the opening 300 and the end of the insertion part 311 away from the cover part 310 from scratching. In addition, the generation of metal wires or metal chips due to scratching is avoided, and the risk of short circuit between the electrode assembly and the metal wires or metal chips falling into the accommodating cavity due to scratching is effectively reduced, that is, the use safety of the single battery to which the battery shell 3 belongs is improved.

[0058] Optionally, the battery housing 3 is applied to a single cell, and the single cell may be a blade battery, for example. Then the battery housing 3 is in a rectangular parallelepiped shape, and the opening 300 is formed at one end of the rectangular parallelepiped battery housing 3 in the longer dimension.

[0059] Furthermore, the battery housing 3 may be formed by bending or rolling and then butt-welding the sides.

[0060] Optionally, the cover portion 310 is in a plate shape, and the inserting portion 311 is in a column shape.

[0061] In this embodiment, in order to improve the guidance and efficiency of the insertion portion 311 of the cover body 31 to the shell body 30, the outer edge of the end of the insertion portion 311 away from the cover 310 is provided with a third chamfer 313, and the third chamfer 313 can be configured as a round chamfer (not shown in the figure) or a straight chamfer as required. In addition, the third chamfer 313 can further prevent the end of the insertion portion 311 away from the cover 310 from scratching the predetermined end of the shell body 30.

[0062] In an optional solution of this embodiment, a second chamfer 312 is provided at the root of the step, and the first chamfer 301 is adaptively engaged with the second chamfer 312, so that the cover body 31 and the shell body 30 can be fully engaged at the opening 300, avoiding the formation of a gap therebetween, which is beneficial to improving the sealing of the battery shell 3.

[0063] In this embodiment, the first chamfer 301 is welded to the second chamfer 312, the insertion portion 311 is welded to the inner wall 303 of the shell body 30, and the cover body 31 is welded to the end face 302 of the shell body 30 at the opening 300, so that all the joint surfaces between the cover body 31 and the shell body 30 are welded, further improving the sealing of the battery shell 3.

[0064] It can be understood that the first chamfer 301 is arranged around the circumference of the shell body 30 , the second chamfer 312 is arranged around the circumference of the cover body 31 , and the third chamfer 313 is arranged around the circumference of the insertion portion 311 .

[0065] In an optional solution of this embodiment, as an implementation of the first chamfer 301 and the second chamfer 312, as shown in FIG. Figures 4 to 9As shown, both the first chamfer 301 and the second chamfer 312 are rounded chamfers. Specifically, since the first chamfer 301 and the second chamfer 312 are adaptively engaged, the radius of the first chamfer 301 is equal to the radius of the second chamfer 312.

[0066] In this embodiment, the wall thickness of the shell body 30 is m, the radius of the first chamfer 301 and the second chamfer 312 is R, and the relationship between the wall thickness m and the radius R is: 0<R≤m, wherein the measurement units of R and m are both millimeters.

[0067] That is to say, the radius R of the first chamfer 301 is not greater than the wall thickness m of the shell body 30, that is, the radius R of the second chamfer 312 is not greater than the wall thickness m of the shell body 30, thereby ensuring that the center of the first chamfer 301 can fall on the shell body 30 instead of falling to the outside, thereby ensuring that the first chamfer 301 can be set tangent to the inner wall 303 and the end face 302 of the shell body 30, avoiding the uneven connection between the first chamfer 301 and the two.

[0068] In an optional solution of this embodiment, as another implementation of the first chamfer 301 and the second chamfer 312, as shown in FIG. Figures 10 to 15 As shown, both the first chamfer 301 and the second chamfer 312 are straight chamfers. Specifically, since the first chamfer 301 and the second chamfer 312 are adaptively engaged, the length of a right angle side of the first chamfer 301 is equal to and parallel to the length of a right angle side of the second chamfer 312, and the length of another right angle side of the first chamfer 301 is equal to and parallel to the length of another right angle side of the second chamfer 312.

[0069] For ease of processing, the first chamfer 301 and the second chamfer 312 can be set to 45° straight chamfers, so that the two right angles of the first chamfer 301 are equal in length, and the two right angles of the second chamfer 312 are equal in length. Of course, according to actual needs, the first chamfer 301 and the second chamfer 312 can also be set to straight chamfers of other angles.

[0070] In this embodiment, one of the right-angled sides of the first chamfer 301 and the second chamfer 312 is n, the wall thickness of the shell body 30 is m, and the relationship between the wall thickness m and the right-angled side length n is: 0<n<(m-0.05), where the unit of measurement of n is millimeter. Specifically, one of the right-angled sides n of the first chamfer 301 refers to the length of the right-angled side of the first chamfer 301 extending along the wall thickness direction of the shell body 30. The right-angled side length n of the second chamfer 312 is defined in the same way.

[0071] That is to say, the right-angle side length n of the first chamfer 301 and the right-angle side length n of the second chamfer 312 are at least 0.05 mm smaller than the wall thickness m of the shell body 30, for example, they can be 0<n<(m-0.1) or 0<n<(m-0.15), etc., so as to avoid the chamfering range of the first chamfer 301 covering the outer edge of the shell body 30, thereby avoiding the outer edge of the shell body 30 at the opening 300 from forming a sharp corner that affects the assembly, strength or welding performance.

[0072] In this embodiment, m≥0.3. That is, according to the capacity of the single battery to which the battery housing 3 belongs and the different housing strength requirements, the wall thickness m of the housing body 30 is configured to be not less than 0.3 mm, for example, 0.3 mm, 0.35 mm, 0.7 mm, 0.8 mm or 1 mm.

[0073] Embodiment 2

[0074] Embodiment 2 provides a single cell battery, which includes the battery housing in Embodiment 1. The technical features of the battery housing disclosed in Embodiment 1 are also applicable to this embodiment, and the technical features of the battery housing disclosed in Embodiment 1 will not be described repeatedly.

[0075] The single cell provided in this embodiment includes a battery housing and an electrode assembly disposed in a receiving cavity of the battery housing. The single cell may be, for example, a blade battery.

[0076] The single cell in this embodiment has the advantages of the battery case in the first embodiment, and the advantages of the battery case disclosed in the first embodiment will not be described again here.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit them; although the utility model is described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some or all of the technical features therein by equivalent; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the various embodiments of the utility model. In addition, those skilled in the art can understand that although some embodiments described herein include certain features included in other embodiments instead of other features, the combination of features of different embodiments means that they are within the scope of the utility model and form different embodiments. For example, any one of the embodiments claimed for protection can be used in any combination. The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the utility model, and should not be regarded as an admission or in any form of implication that the information constitutes prior art known to those skilled in the art.

Claims

1. A battery housing, characterized in that: It includes a shell body and a cover body; An opening is provided at a predetermined end of the shell body, and a first chamfer is provided at an inner edge of the shell body at the opening; The cover body comprises an inserting portion and a cover portion connected in a stepped shape; The cover portion is overlapped with a predetermined end portion of the shell body, the insertion portion is plugged into an inner wall of the shell body, and the first chamfer is opposite to the root of the step.

2. The battery housing according to claim 1, characterized in that: A second chamfer is provided at the root of the step, and the first chamfer is adaptively engaged with the second chamfer.

3. The battery housing according to claim 2, characterized in that: The first chamfer and the second chamfer are both round chamfers.

4. The battery case according to claim 3, characterized in that: The wall thickness of the shell body is m, the radius of the first chamfer and the second chamfer is R, and the relationship between the wall thickness m and the radius R is: 0<R≤m, wherein the measurement unit of R and the measurement unit of m are both millimeters.

5. The battery case according to claim 2, characterized in that: The first chamfer and the second chamfer are both straight chamfers.

6. The battery casing according to claim 5, characterized in that: The length of one of the right-angled sides of the first chamfer and the second chamfer is n, the wall thickness of the shell body is m, and the relationship between the wall thickness m and the right-angled side length n is: 0<n<(m-0.05), where the unit of n is millimeter.

7. The battery casing according to claim 6, characterized in that: m≥0.3。 8. The battery casing according to claim 2, characterized in that: The first chamfer is welded to the second chamfer; And / or, the inserting portion is welded to the inner wall of the shell body; And / or, the cover body is welded to the end surface of the shell body at the opening.

9. The battery casing according to claim 1, characterized in that: The outer edge of the end of the inserting portion away from the cover portion is provided with a third chamfer; The third chamfer is a round chamfer or a straight chamfer.

10. A single cell battery, characterized in that: A battery casing comprising the battery casing according to any one of claims 1 to 9.

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