Single-pass battery

Abstract

The utility model provides a one-way battery, which comprises a shell, a battery module and a battery module, the cover plate assembly is arranged at one end of the shell, and a pole and a first anti-explosion valve are arranged on the cover plate assembly; the end cover is arranged at the other end, opposite to the cover plate assembly, of the shell, and the end cover is provided with a second anti-explosion valve. By applying the technical scheme of the utility model, the technical problem that the safety is low when the battery is used can be improved.

Description

Technical Field

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

[0002] In the related art, the shell structure of the cylindrical battery includes a single-pass structure and a double-pass structure. Both the single-pass structure and the double-pass structure need to use a cover structure to seal the shell to ensure that a sealed cavity is formed inside the shell to accommodate the core package. In the double-pass structure, cover structures are provided on both sides of the double-pass battery, and an explosion-proof valve is provided on the cover structure on each side, which will increase the production cost of the device. In the single-pass structure, only one side of the single-pass battery has a cover structure, and only one explosion-proof valve is provided, and the explosion-proof valve is provided on the cover. During the use of the single-pass battery, when the air pressure in the single-pass battery is too high, it is impossible to ensure that the gas in the single-pass battery is quickly discharged, thereby reducing the safety of the battery during use. Utility Model Content

[0003] The embodiment of the utility model provides a single-pass battery, which can improve the technical problem of low safety when the battery is used.

[0004] In the first aspect, an embodiment of the utility model provides a single-pass battery, which includes: a shell having a accommodating cavity; a cover assembly disposed at one end of the shell, on which a pole and a first explosion-proof valve are disposed; and an end cover disposed at the other end of the shell opposite to the cover assembly, on which a second explosion-proof valve is disposed.

[0005] In one embodiment, the shell has a first opening and a second opening corresponding to the first opening, the first opening and the second opening are respectively connected to the accommodating cavity, and the end cover and the shell are enclosed to form the accommodating cavity.

[0006] In one embodiment, the thickness of the shell is L, 0.3 mm ≤ L ≤ 0.6 mm.

[0007] In one embodiment, the thickness of the end cap is H, 0.5 mm ≤ H ≤ 1.5 mm.

[0008] In one embodiment, the single-pass battery further includes a liquid injection hole, which is disposed on the cover plate assembly, is communicated with the accommodating cavity, and is disposed away from the first explosion-proof valve.

[0009] In one embodiment, the end cover is welded or integrally formed and fixed to the shell.

[0010] In one embodiment, the single-pass battery further includes: a first protective member, which is arranged on the cover assembly and is arranged in alignment with the first explosion-proof valve, and the first protective member is located on a side of the first explosion-proof valve away from the second explosion-proof valve; a second protective member, which is arranged on an end of the outer shell opposite to the cover assembly and is arranged in alignment with the second explosion-proof valve, and the second protective member is located on a side of the second explosion-proof valve away from the first explosion-proof valve.

[0011] In one embodiment, the cover plate assembly includes: a cover plate, which is arranged at the first opening and has a first through hole; an insulating member, which is arranged at the first through hole and has a second through hole, and the pole is connected to the second through hole through penetration.

[0012] In one embodiment, the single-pass battery further includes: a core pack disposed in the accommodating cavity, the pole is electrically connected to one end of the core pack, and the end cover is electrically connected to the other end of the core pack.

[0013] In one embodiment, the single-pass battery also includes a connecting piece, one side of the connecting piece is connected to the core package, the other side of the connecting piece has a protrusion, the end cover has a recessed portion, the protrusion and the recessed portion are arranged in alignment, and the protrusion and the recessed portion are connected.

[0014] By applying the technical solution of the utility model, a first explosion-proof valve is arranged on the cover assembly, and a second explosion-proof valve is arranged at one end of the shell opposite to the cover assembly. When the pressure inside the battery is too high, the first explosion-proof valve and the second explosion-proof valve can be opened at the same time, which can ensure that the internal gas of the single-pass battery is quickly discharged, which is conducive to ensuring the safety of the battery when it is used. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 It is a three-dimensional schematic diagram of a single-pass battery provided by an embodiment of the utility model;

[0017] Figure 2 It is a bottom view schematic diagram of a single-pass battery provided by an embodiment of the utility model;

[0018] Figure 3 It is a side view schematic diagram of a single-pass battery provided by an embodiment of the utility model;

[0019] Figure 4 yes Figure 3 Schematic diagram of the cross section at AA in the middle;

[0020] Figure 5 yes Figure 4 The enlarged schematic diagram of point B in the middle;

[0021] Figure 6 yes Figure 4 The enlarged schematic diagram of the center C;

[0022] Figure 7 It is a structural schematic diagram of a housing provided in an embodiment of the utility model.

[0023] The above drawings include the following reference numerals:

[0024] 10. housing; 11. accommodating chamber; 12. first opening; 13. housing; 14. end cover; 141. recessed portion;

[0025] 21. First explosion-proof valve; 22. Cover plate; 23. Insulator; 24. Pole; 25. Upper plastic; 26. Lower plastic; 27. Collector plate; 28. Conductive terminal;

[0026] 30. Second explosion-proof valve;

[0027] 40. Liquid injection hole;

[0028] 50. a first protective member;

[0029] 60. Second protective member;

[0030] 70. core package; 80. connecting piece; 81. raised portion. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only 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 those skilled in the art without creative work are within the scope of protection of the utility model.

[0032] like Figures 1 to 7 As shown, in the first aspect, an embodiment of the utility model provides a single-pass battery, which includes: a shell 10, having a accommodating cavity 11, a cover assembly, which is arranged at one end of the shell 10, and the cover assembly is provided with a pole 24 and a first explosion-proof valve 21; an end cover 14, which is arranged at the other end of the shell 10 relative to the cover assembly, and the end cover 14 is provided with a second explosion-proof valve 30.

[0033] By applying the technical solution of the present invention, a first explosion-proof valve 21 is provided on the cover assembly, and a second explosion-proof valve 30 is provided at one end of the housing 10 opposite to the cover assembly. When the pressure inside the battery is too high, the first explosion-proof valve 21 and the second explosion-proof valve 30 are opened at the same time, so that the gas inside the single-pass battery can be quickly discharged, which is beneficial to ensuring the safety of the battery when in use.

[0034] In the present application, the injection hole 40 is arranged on the cover assembly. Of course, in other embodiments of the present application, the injection hole 40 can also be arranged at one end of the outer shell 10 relative to the cover assembly. The specific setting should be selected according to the use environment of the single-pass battery, so as to improve the applicability and application range of the single-pass battery.

[0035] It should be noted that the battery is provided with a liquid injection hole 40 and an explosion-proof valve at the same time, which can realize closed-mouth liquid injection while avoiding the risk of open-mouth formation, which is easier to realize in terms of process, is conducive to mass production and reduces costs; and occupies little space and does not affect the battery capacity; a first explosion-proof valve 21 is arranged on the cover assembly, which can improve the safety of the battery. When the internal air pressure of the battery reaches a set value, it opens to help release the internal pressure of the battery and prevent the battery from spontaneously igniting or exploding due to excessive internal pressure, thereby improving the safety of the battery and meeting the needs of cylindrical batteries of various capacities, especially large-capacity cylindrical batteries, so as to ensure the safety and reliability of the battery during use.

[0036] In the present application, the first explosion-proof valve 21 is arranged on the side of the pole 24 away from the injection hole 40, and the second explosion-proof valve 30 is arranged near the recessed portion 141. Of course, the first explosion-proof valve 21 and the second explosion-proof valve 30 can also be arranged at other positions as long as they can meet the exhaust requirements of the single-pass battery. At the same time, the shapes of the first explosion-proof valve 21 and the second explosion-proof valve 30 can be set to other suitable shapes such as circular, elliptical or runway. In this embodiment, the first explosion-proof valve 21 and the second explosion-proof valve 30 are waist-shaped holes. At the same radius, the exhaust volume per unit time of the first explosion-proof valve 21 and the second explosion-proof valve 30 with waist-shaped holes is greater than that of the circular explosion-proof valve, and the pressure relief effect is better. Optionally, the shape and size of the first explosion-proof valve 21 and the second explosion-proof valve 30 can be customized according to the battery capacity or customer requirements, which can improve the applicability and scope of application of the single-pass battery.

[0037] Furthermore, the shell 13 has a first opening 12 and a second opening corresponding to the first opening 12; the first opening 12 and the second opening 12 are respectively connected to the accommodating chamber 11, and the end cover 14 cooperates with the interior of the shell 13 to form the accommodating chamber 11. In the present application, the shell 13 is aluminum. Since aluminum has a lower density, the weight of the single-pass battery is lighter, which makes the single-pass battery of the same capacity thinner and lighter than the steel shell. At the same time, aluminum has the advantages of high strength and high modulus, so that the single-pass battery has high specific strength and specific modulus, which means that it can better resist the impact of external forces while maintaining structural integrity. Moreover, aluminum has excellent corrosion resistance, which helps to extend the service life of the single-pass battery. At the same time, aluminum has good thermal conductivity and electrical conductivity, which is very important for battery heat dissipation and current conduction, and aluminum has good plasticity and castability, which makes it easy to process into shell 10 products of various shapes and sizes.

[0038] Specifically, the thickness of the shell 13 is L, 0.3mm≤L≤0.6mm. When L>0.6mm, the thickness of the shell 13 is too thick, which will increase the production cost of the structure, which is not conducive to the mass production of single-pass batteries. When L<0.3mm, the thickness of the shell 13 is too thin, which will reduce the structural strength of the shell 13 and easily cause the shell 13 to be damaged during use. Therefore, 0.3mm≤L≤0.6mm can not only ensure the reduction of the production cost of the single-pass battery, but also ensure the structural strength of the single-pass battery. For example, L can be set to a value such as 0.3mm, 0.5mm or 0.6mm. The thickness of the shell 13 can be set according to the actual use environment of the single-pass battery, and is not specifically limited here.

[0039] In the present application, the thickness of the shell 13 specifically refers to the distance between the inner wall and the outer wall in the radial direction of the shell 13 .

[0040] Furthermore, the thickness of the end cap 14 is H, 0.5mm≤H≤1.5mm. When H>1.5mm, the thickness of the end cap 14 is too thick, which will increase the production cost of the structure, which is not conducive to the mass production of single-pass batteries. When H<0.5mm, the thickness of the end cap 14 is too thin, which will reduce the structural strength of the end cap 14 and easily cause the end cap 14 to be damaged during use. Therefore, 0.5mm≤H≤1.5mm can not only ensure the reduction of the production cost of the single-pass battery, but also ensure the structural strength of the single-pass battery. For example, H can be set to values ​​such as 0.5mm, 0.8mm or 1.5mm. The thickness of the end cap 14 can be set according to the actual use environment of the single-pass battery, and is not specifically limited here.

[0041] In the present application, the thickness of the end cap 14 specifically refers to the vertical distance between the side of the end cap 14 away from the cover plate assembly and the side of the end cap 14 that is adjacent to the cover plate assembly.

[0042] Specifically, the housing 13 is formed by cold extrusion. Since the cold extrusion process can reduce cutting processing, improve material utilization, and also improve the mechanical properties of parts, the cold extrusion process can reduce production costs as much as possible, while also improving the production efficiency of single-pass batteries, thereby facilitating the mass production of single-pass batteries.

[0043] In the present application, the single-pass battery further includes a liquid injection hole 40 , which is disposed on the cover plate assembly. The liquid injection hole 40 is connected to the accommodating cavity 11 and is disposed away from the first explosion-proof valve 21 .

[0044] Furthermore, the end cap 14 is fixed to the shell 13 by welding. In the present application, the end cap 14 and the shell 13 are laser welded. Since laser welding is efficient and accurate, deep fusion welding and high-speed welding can be achieved. At the same time, the heating range of laser welding is small. Under the conditions of equal power and welding thickness, the welding speed is fast, the heat-affected zone is small, and the welding stress and deformation are small. This enables laser welding to improve production efficiency and reduce processing time and cost. In the above manner, the efficiency and safety of welding the end cap 14 and the shell 13 can be improved, and the structural strength after welding can also be guaranteed.

[0045] Specifically, the single-pass battery further includes: a first protective member 50, which is arranged on the cover plate assembly and is arranged in alignment with the first explosion-proof valve 21, and the first protective member 50 is located on the side of the first explosion-proof valve 21 away from the second explosion-proof valve 30; a second protective member 60, which is arranged on one end of the housing 10 opposite to the cover plate assembly and is arranged in alignment with the second explosion-proof valve 30, and the second protective member 60 is located on the side of the second explosion-proof valve 30 away from the first explosion-proof valve 21. By setting the above structure, not only can the external pollution source be prevented from contacting the first explosion-proof valve 21 and the second explosion-proof valve 30, but also foreign matter can be prevented from contacting the first explosion-proof valve 21 and the second explosion-proof valve 30, so that the durability of the first explosion-proof valve 21 and the second explosion-proof valve 30 can be ensured, and the damage of the first explosion-proof valve 21 and the second explosion-proof valve 30 can be prevented, so as to extend the service life of the first explosion-proof valve 21 and the second explosion-proof valve 30.

[0046] Furthermore, the cover plate assembly includes: a cover plate 22, which is arranged at the first opening 12, and the cover plate 22 has a first through hole, and the first through hole is parallel to the axis of the injection hole 40; an insulating member 23, which is arranged at the first through hole, and the insulating member 23 has a second through hole parallel to the axis of the first through hole.

[0047] In the present application, the cover assembly also includes: an upper plastic 25, a lower plastic 26, a current collecting plate 27 and a conductive terminal 28; the upper plastic 25 and the lower plastic 26 are respectively located on the upper and lower sides of the cover 22, and the insulating member 23 is arranged between the lower plastic 26 and the cover 22, and the insulating member 23 can also seal the gap between the pole 24 and the cover 22, so as to prevent the leakage of the electrolyte in the single-pass battery, which is conducive to ensuring the stable operation of the battery, one end of the current collecting plate 27 is connected to the pole 24, and the other end of the current collecting plate 27 is connected to the core package 70, and the conductive terminal 28 is arranged on the side of the upper plastic 25 away from the lower plastic 26, so as to increase the connection area of ​​the pole 24, which is convenient for connection with other devices, and the upper plastic 25 and the lower plastic 26 can be set to PP material, PP material is polypropylene, which is a polymer formed by addition polymerization of propylene.

[0048] At the same time, the material of the collecting plate 27 can be copper, copper alloy, nickel, nickel alloy or steel, as long as it can meet the conductivity requirements of the single-pass battery. At the same time, the collecting plate 27 and the core package 70 are welded together. The welding method can be FTT welding, spot welding, ultrasonic welding or any other welding method, as long as it can meet the connection requirements of the two, and there is no specific restriction.

[0049] In the application, the pole 24 is a negative pole 24 .

[0050] The single-pass battery also includes a core package 70, which is arranged in the accommodating cavity 11 of the single-pass battery, the pole 24 of the single-pass battery is electrically connected to one end of the core package 70, and the end cover 14 of the single-pass battery is electrically connected to the other end of the core package 70.

[0051] In one embodiment, the single-pass battery also includes a connecting piece 80, one side of the connecting piece 80 is connected to the core package 70, the other side of the connecting piece 80 has a protrusion 81, and the end cover 14 has a recessed portion 141, the protrusion 81 and the recessed portion 141 are arranged in a positional manner, and the protrusion 81 and the recessed portion 141 are connected to electrically connect the connecting end cover 14 to the core package 70. In the present application, the protrusion 81 and the recessed portion 141 are laser penetration welded. Since the laser energy of laser penetration welding is concentrated, the welding can be completed in a very short time, which is suitable for large-scale production. At the same time, the cross-sectional area of ​​the weld of laser penetration welding is small, which reduces the waste of materials, and the weld strength of laser penetration welding is high, which can improve the overall performance of the workpiece. This can further improve the production efficiency of the device, and at the same time can also reduce the production cost of single-pass batteries, which is conducive to the mass production of single-pass batteries.

[0052] Applying the technical solution of the utility model, a first explosion-proof valve 21 is provided on the cover assembly, a second explosion-proof valve 30 is provided at one end of the housing 10 opposite to the cover assembly, and the injection hole 40 is spaced apart from the first explosion-proof valve 21 or the second explosion-proof valve 30. When the pressure inside the battery is too high, the first explosion-proof valve 21 and the second explosion-proof valve 30 are opened at the same time, so that the gas inside the single-pass battery can be quickly discharged, which is conducive to ensuring the safety of the battery during use. It should be noted that the terms used here are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0053] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0054] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0055] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0056] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0057] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A single-pass battery, characterized in that: The single-pass battery comprises: A housing having a receiving cavity; A cover plate assembly is arranged at one end of the housing, and a pole and a first explosion-proof valve are arranged on the cover plate assembly; An end cover is arranged at the other end of the shell opposite to the cover plate assembly, and the end cover is provided with a second explosion-proof valve.

2. The single-pass battery according to claim 1, characterized in that: The housing comprises: The shell has a first opening and a second opening corresponding to the first opening. The first opening and the second opening are respectively connected to the accommodating cavity. The end cover and the shell are combined to form the accommodating cavity.

3. The single-pass battery according to claim 2, characterized in that: The thickness of the shell is L, 0.3mm≤L≤0.6mm.

4. The single-pass battery according to claim 1 or 2, characterized in that: The thickness of the end cover is H, 0.5mm≤H≤1.5mm.

5. The single-pass battery according to claim 1, characterized in that: The single-pass battery further includes a liquid injection hole, which is disposed on the cover plate assembly, is communicated with the accommodating cavity, and is disposed away from the first explosion-proof valve.

6. The single-pass battery according to claim 2, characterized in that: The end cover is welded or integrally formed and fixed to the shell.

7. The single-pass battery according to any one of claims 1-2 or 5-6, characterized in that: The single-pass battery also includes: a first protection member, disposed on the cover plate assembly and aligned with the first explosion-proof valve, the first protection member being located on a side of the first explosion-proof valve away from the second explosion-proof valve; The second protection member is arranged on one end of the housing opposite to the cover assembly and is arranged in alignment with the second explosion-proof valve. The second protection member is located on a side of the second explosion-proof valve away from the first explosion-proof valve.

8. The single-pass battery according to claim 2, characterized in that: The cover plate assembly comprises: A cover plate, which is arranged to cover the first opening, and has a first through hole; The insulating member is arranged at the first through hole, and the insulating member has a second through hole, and the pole is connected to the second through hole through penetration.

9. The single-pass battery according to claim 1, characterized in that: The single-pass battery also includes: The core package is arranged in the accommodating cavity, the pole is electrically connected to one end of the core package, and the end cover is electrically connected to the other end of the core package.

10. The single-pass battery according to claim 9, characterized in that: The single-pass battery also includes a connecting piece, one side of which is connected to the core package, and the other side of which has a protrusion. The end cover has a recessed portion, and the protrusion is aligned with the recessed portion and connected to the recessed portion.

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