Shell, battery cell and battery pack

Abstract

The utility model discloses a shell, cell and battery pack, the shell comprises: a shell assembly, the shell assembly comprises a shell body and cover plates, the two ends of the shell body in the length direction are both provided with the cover plates and connected, and the shell body is provided with an explosion-proof valve; and the insulating assembly comprises a first insulating film and a second insulating film, the first insulating film wraps the peripheral wall of the shell body, a first avoiding hole is formed in the first insulating film, the second insulating film is located in the first avoiding hole, and a second avoiding hole for avoiding the explosion-proof valve is formed in the second insulating film. According to the shell disclosed by the utility model, gas-electricity separation of the battery cell can be realized, a good insulation effect is ensured, and the explosion-proof valve is reliably opened.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and more specifically, to a shell, a battery core and a battery pack. Background Art

[0002] In the related art, a hole is opened on the insulating component of the shell to avoid the explosion-proof valve, but this will result in poor insulation effect at the explosion-proof valve, which cannot meet the insulation requirements and easily cause safety hazards to the battery cell. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a shell that can achieve gas-electricity separation of the battery core and ensure good insulation effect and reliable opening of the explosion-proof valve.

[0004] Another object of the present invention is to provide a battery core having the above-mentioned shell.

[0005] Another object of the present invention is to provide a battery pack having the above-mentioned battery cell.

[0006] According to the shell of the embodiment of the utility model, it includes: a shell component, the shell component includes a shell body and a cover plate, the cover plates are provided at both ends of the shell body in the length direction and are connected, and the shell body is provided with an explosion-proof valve; an insulating component, the insulating component includes a first insulating film and a second insulating film, the first insulating film is coated on the outer peripheral wall of the shell body, the first insulating film is provided with a first avoidance hole, the second insulating film is located in the first avoidance hole, and the second insulating film is provided with a second avoidance hole for avoiding the explosion-proof valve.

[0007] According to the shell of the embodiment of the utility model, an explosion-proof valve is provided on the shell body, which can reduce the gas discharge path, make the gas discharge smoother, and realize the gas-electricity separation of the battery cell, thereby ensuring the safety of the battery cell; the first insulating film is coated on the outer peripheral wall of the shell body, the first insulating film is provided with a first avoidance hole, the second insulating film is located in the first avoidance hole, and the second insulating film is provided with a second avoidance hole for avoiding the explosion-proof valve, so that the second insulating film can insulate and protect the gap between the explosion-proof valve and the first avoidance hole, thereby ensuring good insulation effect, and ensuring that the explosion-proof valve can be opened reliably, thereby ensuring the safety of the battery cell.

[0008] In addition, the housing according to the above embodiment of the utility model may also have the following additional technical features:

[0009] According to the housing of some embodiments of the utility model, the hole wall of the first avoidance hole and the outer peripheral wall of the second insulating film are arranged at intervals.

[0010] According to some embodiments of the present invention, the minimum distance between the hole wall of the first avoidance hole and the outer peripheral wall of the second insulating film is 0.8 mm-2 mm.

[0011] According to some embodiments of the present invention, the minimum distance between the outer peripheral wall of the second avoidance hole and the outer peripheral wall of the explosion-proof valve is 0.1 mm-0.8 mm.

[0012] According to some embodiments of the present invention, the minimum distance between the hole wall of the first avoidance hole and the outer peripheral wall of the explosion-proof valve is 3 mm-10 mm.

[0013] According to some embodiments of the utility model, the second insulating film includes: a main body portion, one end of which is connected to the shell body and the other end extends toward a side away from the shell body; an extension portion, which is connected to one end of the main body portion away from the shell body, and the extension portion is provided with the second avoidance hole, and the side of the extension portion away from the shell body is flush with the side of the explosion-proof valve away from the shell body.

[0014] According to some embodiments of the present invention, the explosion-proof valve is arranged on the surface with the smallest area on the shell body.

[0015] According to some embodiments of the present invention, the thickness of the second insulating film is 0.05 mm-0.3 mm.

[0016] The battery cell according to the embodiment of the utility model includes the housing according to the embodiment of the utility model.

[0017] According to the battery cell of the embodiment of the utility model, an explosion-proof valve is provided on the shell body, which can reduce the gas discharge path, make the gas discharge smoother, and realize the gas-electricity separation of the battery cell, thereby ensuring the safety of the battery cell; the first insulating film is coated on the outer peripheral wall of the shell body, the first insulating film is provided with a first avoidance hole, the second insulating film is located in the first avoidance hole, and the second insulating film is provided with a second avoidance hole for avoiding the explosion-proof valve, so that the second insulating film can insulate and protect the gap between the explosion-proof valve and the first avoidance hole, thereby ensuring good insulation effect, and ensuring that the explosion-proof valve can be opened reliably, thereby ensuring the safety of the battery cell.

[0018] The battery pack according to the embodiment of the present invention includes the battery cell according to the embodiment of the present invention.

[0019] According to the battery pack of the embodiment of the utility model, an explosion-proof valve is provided on the shell body, which can reduce the gas exhaust path, make the gas exhaust smoother, and realize the gas-electricity separation of the battery cell, thereby ensuring the safety of the battery cell; the first insulating film is coated on the outer peripheral wall of the shell body, the first insulating film is provided with a first avoidance hole, the second insulating film is located in the first avoidance hole, and the second insulating film is provided with a second avoidance hole for avoiding the explosion-proof valve, so that the second insulating film can insulate and protect the gap between the explosion-proof valve and the first avoidance hole, thereby ensuring good insulation effect, and ensuring that the explosion-proof valve can be opened reliably, thereby ensuring the safety of the battery cell.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 is a schematic structural diagram of a housing according to an embodiment of the utility model;

[0023] Figure 2 is a front view of a housing according to an embodiment of the utility model;

[0024] Figure 3 yes Figure 2 A cross-sectional view along the direction indicated by line AA;

[0025] Figure 4 yes Figure 3 The middle circle shows the enlarged structural schematic diagram of B;

[0026] Figure 5 is a top view of a housing according to an embodiment of the utility model;

[0027] Figure 6 4 is a top view of a first insulating film of a housing according to an embodiment of the utility model.

[0028] Reference numerals:

[0029] 100. Shell;

[0030] 10. Shell assembly; 11. Shell body; 12. Cover plate; 111. Explosion-proof valve;

[0031] 20. Insulating component; 21. First insulating film; 22. Second insulating film; 211. First avoidance hole; 221. Second avoidance hole; 222. Main body; 223. Extension part. DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0034] In the description of the present invention, "first feature" and "second feature" may include one or more such features, "plurality" means two or more, the first feature "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them, the first feature "above", "above" and "above" the second feature may include the first feature being directly above and diagonally above the second feature, or may simply mean that the first feature is at a higher level than the second feature.

[0035] The housing 100 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0036] Reference Figure 1-Figure 6 As shown, the housing 100 according to the embodiment of the present invention may include: a housing assembly 10 .

[0037] Specifically, the housing assembly 10 includes a housing body 11 and a cover plate 12. The housing body 11 has a length direction (eg Figure 2The two ends of the shell body 11 (in the left and right directions shown in the figure) are provided with cover plates 12, and the two ends of the shell body 11 in the length direction are respectively connected to the cover plates 12, so as to form a shell 100, ensure the structural strength of the shell assembly 10, and reliably protect the internal structure of the battery cell. The shell body 11 is provided with an explosion-proof valve 111. When the battery cell has thermal runaway, the explosion-proof valve 111 can be used to relieve the pressure and exhaust the battery cell, release the internal pressure of the battery cell, and ensure the safety of the battery cell. The gas can be discharged directly from the explosion-proof valve 111 on the shell body 11. Compared with the gas being discharged through the cover plate 12, the gas discharge path can be reduced, making the gas discharge smoother. At the same time, the gas-electricity separation of the battery cell can be achieved, ensuring the safety of the battery cell.

[0038] In addition, if Figure 1-Figure 6 As shown, the shell 100 also includes an insulating component 20, and the insulating component 20 includes a first insulating film 21 and a second insulating film 22. The first insulating film 21 is coated on the outer peripheral wall of the shell body 11, and the insulation protection requirements of the shell body 11 can be met through the first insulating film 21. A first avoidance hole 211 is provided on the first insulating film 21, and the second insulating film 22 is located in the first avoidance hole 211. A second avoidance hole 221 for avoiding the explosion-proof valve 111 is provided on the second insulating film 22, which is convenient for setting the explosion-proof valve 111 on the shell body 11. The gap between the explosion-proof valve 111 and the first avoidance hole 211 can be insulated and protected by the second insulating film 22, ensuring a good insulation effect, avoiding the problem of directly opening the explosion-proof valve 111 in the related technology to expose the shell component 10 and cause safety hazards, and ensuring the insulation performance.

[0039] At the same time, the explosion-proof valve 111 can be avoided through the second avoidance hole 221, avoiding the problem that the explosion-proof valve 111 is completely covered inside the insulating component 20 and affects the normal opening of the explosion-proof valve 111. It can avoid obstruction to the normal opening of the explosion-proof valve 111, ensure that the explosion-proof valve 111 opens reliably, and ensure the safety of the battery cell.

[0040] It should be noted that, for the convenience of description, the directions such as "left", "right", "up" and "down" in the present invention are based on the direction relationships shown in the accompanying drawings, and are not limitations on the directions in actual application.

[0041] In some embodiments, the second insulating film 22 can be vertically attached to the first avoidance hole 211 to ensure reliable positioning of the second insulating film 22, avoid the problem of multiple positioning required for the second insulating film 22 to be wrapped and installed, facilitate installation, facilitate automatic production, and reduce scrap rate and rework costs. For example, addressing and positioning are performed through a CCD camera to ensure reliable positioning, accurate assembly, high production efficiency, and can achieve assembly with an accuracy of 0.1mm-0.8mm.

[0042] In some embodiments, the first insulating film 21 may be a polyethylene glycol terephthalate (PET) piece, which can meet the required insulation requirements, has stable performance, is not easily deformed or aged, can extend the service life, and ensures a good insulation effect.

[0043] According to the shell 100 of the embodiment of the utility model, an explosion-proof valve 111 is provided on the shell body 11, which can reduce the gas exhaust path, make the gas exhaust smoother, and realize the gas-electricity separation of the battery cell, thereby ensuring the safety of the battery cell; the first insulating film 21 is coated on the outer peripheral wall of the shell body 11, and the first insulating film 21 is provided with a first avoidance hole 211, the second insulating film 22 is located in the first avoidance hole 211, and the second insulating film 22 is provided with a second avoidance hole 221 for avoiding the explosion-proof valve 111, so that the second insulating film 22 can insulate and protect the gap between the explosion-proof valve 111 and the first avoidance hole 211, thereby ensuring good insulation effect, and ensuring that the explosion-proof valve 111 is opened reliably, thereby ensuring the safety of the battery cell.

[0044] In some embodiments of the present invention, Figure 4 and Figure 5 As shown, the hole wall of the first avoidance hole 211 and the outer peripheral wall of the second insulating film 22 are spaced apart, which can avoid the connection between the first insulating film 21 and the second insulating film 22, which may cause problems such as warping and falling off, ensure reliable insulation effect, and reduce matching accuracy, thereby reducing the processing accuracy of the hole wall of the first avoidance hole 211 and the outer peripheral wall of the second insulating film 22, and reducing production costs.

[0045] According to some embodiments of the present invention, Figure 4 As shown, the minimum distance between the hole wall of the first avoidance hole 211 and the outer peripheral wall of the second insulating film 22 is 0.8mm-2mm, that is, the minimum distance between the hole wall of the first avoidance hole 211 and the outer peripheral wall of the second insulating film 22 is L1 and satisfies 0.8mm≤L1≤2mm. Within the above range, the required insulation requirements can be met, the insulation withstand voltage at the explosion-proof valve 111 is guaranteed, the creepage distance can be ensured to meet the safety requirements, and the matching accuracy can be reduced, thereby reducing production costs and improving assembly efficiency. For example, in some specific embodiments, the minimum distance between the hole wall of the first avoidance hole 211 and the outer peripheral wall of the second insulating film 22 can be 0.8mm, 0.9mm, 1.0mm, 1.5mm, 1.8mm, 2mm, etc.

[0046] In some embodiments of the present invention, Figure 4As shown, the minimum distance between the outer wall of the second avoidance hole 221 and the outer wall of the explosion-proof valve 111 is 0.1mm-0.8mm, that is, the minimum distance between the outer wall of the second avoidance hole 221 and the outer wall of the explosion-proof valve 111 is L2 and satisfies 0.1mm≤L2≤0.8mm. Within the above range, the required insulation requirements can be met, the insulation withstand voltage at the explosion-proof valve 111 can be ensured, the creepage distance can meet the safety requirements, and the matching accuracy can be reduced, thereby reducing production costs and improving assembly efficiency. At the same time, the problem of the second insulating film 22 covering the explosion-proof valve 111 and affecting the normal opening of the explosion-proof valve 111 can be avoided, ensuring that the explosion-proof valve 111 is opened reliably and ensuring the safety of the battery cell. For example, the minimum distance between the outer wall of the second avoidance hole 221 and the outer wall of the explosion-proof valve 111 can be 0.1mm, 0.2mm, 0.2mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, etc.

[0047] According to some embodiments of the present invention, Figure 4 As shown, the minimum distance between the hole wall of the first avoidance hole 211 and the outer peripheral wall of the explosion-proof valve 111 is 3mm-10mm, that is, the minimum distance between the hole wall of the first avoidance hole 211 and the outer peripheral wall of the explosion-proof valve 111 is L3 and satisfies 3mm≤L3≤10mm. Within the above range, it is convenient to install the explosion-proof valve 111 and the second insulating film 22 in the first avoidance hole 211, meet the required assembly and insulation requirements, ensure the insulation withstand voltage at the explosion-proof valve 111, ensure that the creepage distance meets the safety requirements, and can reduce the matching accuracy, thereby reducing production costs and improving assembly efficiency. For example, in some specific embodiments, the minimum distance between the hole wall of the first avoidance hole 211 and the outer peripheral wall of the explosion-proof valve 111 can be 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc.

[0048] In some embodiments, Figure 4 As shown, the second insulating film 22 includes a main body portion 222 and an extension portion 223. One end of the main body portion 222 is connected to the shell body 11, and the other end of the main body portion 222 faces a side away from the shell body 11 (eg Figure 4 The extension portion 223 extends from the upper side shown in the figure, and the extension portion 223 is connected to the end of the main body portion 222 away from the shell body 11, which can improve the structural strength of the second insulating film 22.

[0049] In addition, if Figure 1 , Figure 4 and Figure 5As shown, a second avoidance hole 221 is provided on the extension portion 223, and the side of the extension portion 223 away from the shell body 11 is flush with the side of the explosion-proof valve 111 away from the shell body 11, so that the second insulating film 22 has a good fitting effect, avoiding problems such as the explosion-proof valve 111 protruding alone and causing damage, ensuring the insulation effect at the explosion-proof valve 111 is reliable, and making the explosion-proof valve 111 open smoothly, thereby ensuring the safety of the battery cell.

[0050] In some embodiments of the present invention, Figure 1 , Figure 4-Figure 6 As shown, the explosion-proof valve 111 is arranged on the surface with the smallest area on the shell body 11, which can ensure the structural strength of the shell body 11, avoid deformation and other problems caused by setting the explosion-proof valve 111 on the surface with a larger area of ​​the shell body 11, and ensure the overall strength and stability of the shell assembly 10.

[0051] According to some embodiments of the present invention, Figure 4 As shown, the thickness of the second insulating film 22 is 0.05mm-0.3mm, that is, the thickness of the second insulating film 22 is T and satisfies 0.05mm≤T≤0.3mm. Within the above range, it can ensure that the second insulating film 22 meets the required insulation requirements, and avoid the second insulating film 22 being too thick and prone to interference and scratches with other structures, which is convenient for assembly and can reduce production costs. For example, in some specific embodiments, the thickness of the second insulating film 22 can be 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, etc.

[0052] The battery cell according to the embodiment of the utility model includes the shell 100 according to the embodiment of the utility model. Since the shell 100 according to the embodiment of the utility model has the above-mentioned beneficial technical effects, the battery cell according to the embodiment of the utility model can reduce the gas discharge path by providing the explosion-proof valve 111 on the shell body 11, so that the gas discharge is smoother, and the gas-electricity separation of the battery cell can be achieved, thereby ensuring the safety of the battery cell; the first insulating film 21 is coated on the outer peripheral wall of the shell body 11, the first insulating film 21 is provided with a first avoidance hole 211, the second insulating film 22 is located in the first avoidance hole 211, and the second insulating film 22 is provided with a second avoidance hole 221 for avoiding the explosion-proof valve 111, so that the second insulating film 22 can insulate and protect the gap between the explosion-proof valve 111 and the first avoidance hole 211, thereby ensuring good insulation effect, and ensuring that the explosion-proof valve 111 is opened reliably, thereby ensuring the safety of the battery cell.

[0053] The battery pack according to the embodiment of the utility model includes the battery cell according to the embodiment of the utility model. Since the battery cell according to the embodiment of the utility model has the above-mentioned beneficial technical effects, the battery pack according to the embodiment of the utility model can reduce the gas discharge path by providing an explosion-proof valve 111 on the shell body 11, so that the gas discharge is smoother, and the gas-electricity separation of the battery cell can be achieved to ensure the safety of the battery cell; the first insulating film 21 is coated on the outer peripheral wall of the shell body 11, the first insulating film 21 is provided with a first avoidance hole 211, the second insulating film 22 is located in the first avoidance hole 211, and the second insulating film 22 is provided with a second avoidance hole 221 for avoiding the explosion-proof valve 111, so that the second insulating film 22 can insulate and protect the gap between the explosion-proof valve 111 and the first avoidance hole 211, ensure good insulation effect, and ensure that the explosion-proof valve 111 is opened reliably, thereby ensuring the safety of the battery cell.

[0054] In some embodiments, the battery pack can be used as a power battery, applied to vehicles (such as electric vehicles) and energy storage fields, can meet the required use requirements, and ensure safety in use. For example, the battery pack can be a lithium-ion battery.

[0055] Other structures and operations of the housing 100, the battery cell and the battery pack according to the embodiment of the utility model are known to those skilled in the art and will not be described in detail here.

[0056] 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.

[0057] In the description of this specification, the description with reference to the terms "embodiment", "specific embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0058] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A housing, characterized in that: include: A shell assembly, the shell assembly comprising a shell body and a cover plate, the cover plates are provided at both ends of the shell body in the length direction and are connected, and an explosion-proof valve is provided on the shell body; The insulating component includes a first insulating film and a second insulating film, wherein the first insulating film is coated on the outer peripheral wall of the shell body, the first insulating film is provided with a first avoidance hole, the second insulating film is located in the first avoidance hole, and the second insulating film is provided with a second avoidance hole for avoiding the explosion-proof valve.

2. The housing according to claim 1, characterized in that The hole wall of the first avoidance hole and the outer peripheral wall of the second insulating film are arranged at intervals.

3. The housing according to claim 2, characterized in that The minimum distance between the hole wall of the first avoidance hole and the outer peripheral wall of the second insulating film is 0.8 mm-2 mm.

4. The housing according to claim 1, characterized in that The minimum distance between the outer peripheral wall of the second avoidance hole and the outer peripheral wall of the explosion-proof valve is 0.1 mm-0.8 mm.

5. The housing according to claim 1, characterized in that The minimum distance between the hole wall of the first avoidance hole and the outer peripheral wall of the explosion-proof valve is 3mm-10mm.

6. The housing according to claim 1, characterized in that The second insulating film includes: A main body portion, one end of which is connected to the shell body and the other end of which extends toward a side away from the shell body; An extension part is connected to an end of the main body away from the shell body, and the extension part is provided with the second avoidance hole, and the side of the extension part away from the shell body is flush with the side of the explosion-proof valve away from the shell body.

7. The housing according to claim 1, characterized in that The explosion-proof valve is arranged on the surface of the shell body with the smallest area.

8. The housing according to claim 1, characterized in that The thickness of the second insulating film is 0.05 mm-0.3 mm.

9. A battery cell, characterized in that: Comprising a housing according to any one of claims 1-8.

10. A battery pack, characterized in that: Comprising the battery cell according to claim 9.

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