Battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery which comprises a limiting plate, a protection assembly and a pole group, the limiting plate is located in the protection assembly, the pole group is arranged in the protection assembly, the limiting plate is connected with the outer surface of the pole group, and when the limiting plate is connected with the protection assembly, the pole group is arranged in the protection assembly. And the limiting plate can be selectively expanded and is used for filling a gap between the pole group and the protection assembly. Thus, after the pole group is installed in the protection assembly, the limiting plate is connected with the protection assembly, a gap between part of the pole group and the protection assembly can be filled, the limiting plate is expanded to abut against the pole group and the protection assembly, and the limiting plate can stably limit the position of the pole group in the protection assembly; shaking of the pole group in the protection assembly when the battery is vibrated is reduced, and the safety performance and the stability of the battery are improved.

Description

Technical Field

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

[0002] As a device that can provide stable voltage and stable current, the battery has a simple structure and is easy to carry, and plays a great role in social life.

[0003] In the related art, the battery includes a cover plate, a shell and a pole group. The cover plate is provided with a pole. The pole group is installed inside the shell, the pole group and the pole are fixedly connected, and the cover plate and the shell are sealed and connected. After the installation of the battery is completed, the external circuit can be connected to the pole group through the pole, so that the battery can supply power to the external circuit.

[0004] Existing lithium-ion batteries often assemble the positive and negative electrode sheets into electrode groups by lamination or winding. In order to install the uncharged electrode group into the shell, the volume of the electrode group needs to be smaller than the volume of the internal cavity of the shell. After the battery is assembled, charging the electrode group will cause the positive and negative electrodes of the electrode group to expand and fill part of the gap between the electrode group and the shell and cover during assembly. However, for batteries assembled by lamination, the electrode group only expands in its thickness direction during charging, and a certain gap is still left between the top and both ends of the electrode group and the shell or cover. When the battery is impacted, the electrode group may shake, thereby breaking the connection between the electrode group and the cover or even causing safety hazards such as short circuit, fire and explosion. Utility Model Content

[0005] The utility model aims to provide a battery to solve the problem that the pole group of the laminated battery is easy to shake inside the shell and the position is unstable.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A battery comprises: a limit plate; a protection component, wherein the limit plate is located inside the protection component; and a pole group, wherein the pole group is arranged inside the protection component, and the limit plate is connected to the outer surface of the pole group. When the limit plate is connected to the protection component, the limit plate can be selectively expanded to fill the gap between the pole group and the protection component.

[0008] Preferably, the limiting plate is provided with an adjustment hole for enabling the limiting plate to selectively expand, and the adjustment hole is communicated with the outside.

[0009] Preferably, the pole group is connected to a pole lug, and the limiting plate is provided with a limiting hole corresponding to the position of the pole lug, so as to enable the limiting plate to be sleeved on the pole lug.

[0010] Preferably, the limiting plate comprises a protective layer and a filling layer, wherein the protective layer covers the filling layer, the protective layer is made of a flexible material, and the filling layer is made of an elastically compressible material.

[0011] Preferably, the protective layer is made of plastic material, and / or the filling layer is made of aerogel material.

[0012] Preferably, the thickness of the limiting plate before compression is 0.1 mm-5 mm, and / or the thickness of the protective layer is 0.02 mm-0.1 mm.

[0013] Preferably, the protection assembly includes a cover plate, and the limiting plate includes a first plate, and the first plate is arranged in a gap between the cover plate and the pole group.

[0014] Preferably, a liquid injection hole is provided on the cover plate, the adjustment hole is coaxially arranged with the liquid injection hole, and the aperture of the adjustment hole is smaller than the aperture of the liquid injection hole.

[0015] Preferably, the protection assembly includes a shell, and the limiting plate includes a second plate, and the second plate is arranged in a gap between the pole group and the shell.

[0016] Preferably, two second plates are provided, and the two second plates are symmetrically arranged in the gap between the shell and the two sides in the thickness direction of the pole group, and one end of the two second plates on the same side is connected to the two ends of the first plate respectively.

[0017] Beneficial effects of the utility model:

[0018] A battery comprises a limit plate, a protection component and an electrode group, wherein the limit plate is located inside the protection component; the electrode group is arranged inside the protection component, and the limit plate is connected to the outer surface of the electrode group. When the limit plate is connected to the protection component, the limit plate can be selectively expanded to fill the gap between the electrode group and the protection component.

[0019] In this way, the limiting plate is connected to the electrode group installed in the protection component, and the limiting plate is expanded so that the limiting plate with increased volume fills the gap between the electrode group and the protection component, which can limit the position of the electrode group inside the protection component. When the battery is vibrated or collided, the electrode group is not likely to break at the connection between the electrode group and the cover plate due to shaking inside the protection component, which is beneficial to improving the safety performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is an exploded view of a battery in one embodiment of the utility model;

[0021] Figure 2It is a cross-sectional view of a battery when the limiting plate is in a compressed state in one embodiment of the utility model;

[0022] Figure 3 It is a cross-sectional view of a battery when the limiting plate is in an expanded state in one embodiment of the utility model;

[0023] Figure 4 It is a cross-sectional view of a limiting plate in one embodiment of the utility model;

[0024] Figure 5 It is a structural schematic diagram of a battery in one embodiment of the utility model.

[0025] In the figure:

[0026] 1. Limiting plate; 11. Adjusting hole; 12. Limiting hole; 13. Protective layer; 14. Filling layer; 15. First plate; 16. Second plate; 2. Protective assembly; 21. Cover plate; 211. Liquid injection hole; 212. Pole; 22. Shell; 3. Pole group; 31. Pole ear; X, first direction. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0028] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0030] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0031] See also Figure 1 The utility model provides a battery, including a limiting plate 1, a protection component 2 and a pole group 3, wherein the limiting plate 1 is located inside the protection component 2; the pole group 3 is arranged inside the protection component 2, and the limiting plate 1 is connected to the outer surface of the pole group 3. When the limiting plate 1 is connected to the protection component 2, the limiting plate 1 can be selectively expanded to fill the gap between the pole group 3 and the protection component 2.

[0032] In this embodiment, the battery is a square shell battery, and the electrode group 3 includes a positive electrode sheet (not shown in the figure), a negative electrode sheet (not shown in the figure) and a diaphragm (not shown in the figure). The diaphragm is arranged between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet, the negative electrode sheet and the diaphragm are wound or stacked, and the limiting plate 1 is made of corrosion-resistant material.

[0033] It should be noted that the limit plate 1 is in a vacuum compression state before being installed to the electrode group 3, which makes it convenient for the staff to assemble the limit plate 1 into the protection component 2. When the limit plate 1 is installed to the electrode group 3 and the assembly of the battery is completed, the limit plate 1 expands in the gap between the electrode group 3 and the protection component 2, and protects the space inside the component 2, thereby limiting the position of the electrode group 3 in the protection component 2. The limit plate 1 made of corrosion-resistant material can stably exist inside the protection component 2 to avoid loss of the limiting effect due to corrosion by the electrolyte.

[0034] In this way, after the electrode group 3 is installed inside the protection component 2, the limited plate 1 with a compressed volume is installed on the electrode group 3, and the limited plate 1 is expanded. As the volume of the limited plate 1 increases, the gap between the electrode group 3 and the protection component 2 is filled, so that the limited plate 1 abuts against the electrode group 3, thereby achieving the effect of limiting the position of the electrode group 3 in the protection component 2, reducing the shaking of the electrode group 3 in the protection component 2, and improving the safety and stability of the battery.

[0035] See also Figure 2 and Figure 3 In some embodiments, the limiting plate 1 is provided with an adjustment hole 11 for enabling the limiting plate 1 to selectively expand, and the adjustment hole 11 is connected to the outside. The adjustment hole 11 is a circular hole.

[0036] In this way, by opening an adjustment hole 11 connected to the outside on the limit plate 1, it is convenient for the staff to quickly adjust the volume of the limit plate 1 through the adjustment hole 11 after completing the assembly of the battery, thereby improving the expansion efficiency of the limit plate 1 and further improving the limiting efficiency of the electrode group 3.

[0037] It should be noted that the shape and diameter of the adjustment hole 11 can be adjusted according to the size of the battery, and no further details are given here.

[0038] See also Figure 2 and Figure 3 In some embodiments, the pole group 3 is connected to a pole ear 31, and the limiting plate 1 is provided with a limiting hole 12 at a position corresponding to the pole ear 31, so that the limiting plate 1 is sleeved on the pole ear 31. There are two pole ears 31, and the two pole ears 31 are respectively fixed on the side wall of the same side of the pole group 3, and the cross-sectional area of ​​the limiting hole 12 is adapted to the cross-sectional area of ​​the pole ear 31, so that the limiting plate 1 can be clamped with the pole ear 31.

[0039] In this way, when the limiting plate 1 is assembled to the pole group 3, the pole ear 31 is located in the limiting hole 12, which can avoid interference with the pole ear 31 when assembling the limiting plate 1, and at the same time facilitate the staff to quickly assemble the limiting plate 1 to the pole group 3, thereby improving assembly efficiency.

[0040] See also Figure 4 In some embodiments, the limiting plate 1 includes a protective layer 13 and a filling layer 14, wherein the protective layer 13 covers the filling layer 14, the protective layer 13 is made of a flexible material, and the filling layer 14 is made of an elastically compressible material. In some embodiments, the protective layer 13 is made of a plastic material, and the filling layer 14 is made of an aerogel material.

[0041] In this embodiment, before the limiting plate 1 is installed inside the protective component 2, it is necessary to compress and evacuate the limiting plate 1 so that the filling layer 14 is fully compressed to the required thickness. When the limiting plate 1 is assembled on the electrode group 3, the protective layer 13 is punctured, so that the filling layer 14 expands rapidly under the action of air pressure.

[0042] In this way, the protective layer 13 made of flexible material can protect the filling layer 14. At the same time, when the filling layer 14 expands, the protective layer 13 can have good deformation performance, so that it can adaptively deform according to the gap between the electrode group 3 and the protection component 2; the staff can extend the puncturing device (such as a puncturing needle) through the adjustment hole 11 to puncture the protective layer 13 so that the filling layer 14 in a compressed state expands under the action of air pressure, thereby achieving the effect of limiting the electrode group 3.

[0043] It should be noted that the aerogel material can be made of plastic or silicone rubber, the filling layer 14 can be made of plastic or alloy plastic, and the materials of the protective layer 13 and the filling layer 14 can be adjusted according to actual needs.

[0044] See also Figure 1 In some embodiments, the thickness of the limiting plate 1 before compression is 0.1mm-5mm, and the thickness of the protective layer 13 is 0.02mm-0.1mm. It should be noted that the thickness of the limiting plate 1 before compression can be 1mm, 2mm, 3mm, 4mm, etc., and the thickness of the protective layer 13 can be 0.02mm, 0.03mm, 0.05mm, 0.07mm, 0.09mm, etc. The thickness of the limiting plate 1 before compression and the thickness of the protective layer 13 can be adjusted according to the size of the shell 22 and the pole group 3. In this embodiment, the compression ratio of the limiting plate 1 (i.e., the thickness ratio before and after compression) is 50-90%.

[0045] See also Figure 2 In some embodiments, the protection component 2 includes a cover plate 21 , and the limiting plate 1 includes a first plate 15 , and the first plate 15 is disposed in a gap between the cover plate 21 and the pole group 3 .

[0046] In this embodiment, the width of the first plate 15 is equal to the thickness of the pole group 3, and the length direction of the first plate 15 is parallel to the length direction of the cover plate 21; the first plate 15 is fixedly connected to the side wall of the pole group 3 facing the cover plate 21, and the pole ear 31 is arranged on the side wall of the pole group 3 facing the cover plate 21, and the limiting hole 12 is opened on the first plate 15.

[0047] In this way, the first plate 15 is sleeved on the pole ear 31, so that the first plate 15 is assembled into the gap between the pole group 3 and the cover plate 21. After the battery is assembled, the protective layer 13 can be punctured to allow the first plate 15 to expand rapidly, thereby limiting the position of the pole group 3 and the pole ear 31 arranged on the pole group 3 in the protection component 2, making it difficult for the pole group 3 to shake in the protection component 2, and avoiding the connection between the pole ear 31 and the cover plate 21 from being broken due to the displacement of the position of the pole group 3.

[0048] See also Figure 3 and Figure 5 A liquid injection hole 211 is opened on the cover plate 21 , the adjustment hole 11 is coaxially arranged with the liquid injection hole 211 , and the aperture of the adjustment hole 11 is smaller than the aperture of the liquid injection hole 211 .

[0049] In this embodiment, two poles 212 are fixedly provided at positions of the cover plate 21 corresponding to the pole lugs 31 . The poles 212 are fixedly connected to the pole lugs 31 by welding. The injection hole 211 is located between the two poles 212 and is used to inject electrolyte into the shell.

[0050] It can be understood that after the battery is assembled, the electrolyte is first injected through the injection hole 211, and then the puncturing device is extended into the adjustment hole 11 and punctures the protective layer 13, so that the filling layer 14 in the vacuum environment is balanced with the external air pressure, thereby increasing the volume of the filling layer 14 and filling the gap between the electrode group 3 and the cover plate 21.

[0051] In this way, the injection hole 211 and the adjustment hole 11 are coaxially arranged, so that the electrolyte is not easily interfered by the limiting plate 1 when entering the battery through the injection hole 211; the staff can pierce the protective layer 13 through the injection hole 211 and the adjustment hole 11, so that the limiting plate 1 can expand rapidly, thereby fixing the electrode group 3 and the electrode ear 31, and improving the safety and stability of the battery.

[0052] See also Figure 2 In some embodiments, the protection component 2 includes a shell 22 , and the limiting plate 1 includes a second plate 16 , and the second plate 16 is disposed in a gap between the pole group 3 and the shell 22 .

[0053] In this embodiment, the wall thickness of the shell 22 is 0.2 mm-0.8 mm; the shell 22 is connected to the cover plate 21, the length direction of the second plate 16 is parallel to the height direction of the electrode group 3, and the width of the second plate 16 is equal to the thickness of the electrode group 3. The second plate 16 is fixedly connected to the first plate 15 to form a limit plate 1. When the staff punctures the limit plate 1 through the adjustment hole 11, the first plate 15 and the second plate 16 expand simultaneously.

[0054] In this way, the first plate 15 and the second plate 16 expand to fill the gap between the electrode group 3 and the cover plate 21 and the shell 22, thereby preventing the electrode group 3 from shaking inside the shell 22 and improving the safety and stability of the battery.

[0055] It should be noted that the assembly ratio of the pole group 3 (total thickness of the pole group 3 / internal width of the shell 22) is 80%-90%, the number of pole groups 3 can be 1, 2, or 4. In this embodiment, 4 pole groups 3 are provided. The size of the shell 22 can be adjusted according to the number and specifications of the pole groups 3. The material of the shell 22 can be plastic or metal, and the material of the cover plate 21 can be metal, plastic, ceramic, or rubber. In this embodiment, the shell 22 and the cover plate 21 are both made of aluminum. The pole 212 is sealed and connected to the cover plate 21 via a rubber ring. The materials of the shell 22 and the cover plate 21 can be adjusted according to actual needs, and no further examples are given here.

[0056] See also Figures 1 to 3 In some embodiments, two second plates 16 are provided, and the two second plates 16 are symmetrically arranged in the gap between the two sides of the pole group 3 in the first direction X and the housing 22, and one end of the same side of the two second plates 16 is connected to the two ends of the first plate 15. In this embodiment, the first direction X is parallel to the thickness direction of the pole group 3.

[0057] In this way, since the electrode group 3 will expand in the first direction X during the charging process, the gap between the side wall of the electrode group 3 in the first direction X and the shell 22 can be filled. The second plate 16 is arranged on both sides of the electrode group 3 in the first direction X, which can fill the gap between the two sides of the electrode group 3 in the first direction X and the shell 22, making the position of the electrode group 3 in the shell 22 more stable, thereby improving the safety of the battery.

[0058] In this embodiment, the working principle of the battery is as follows:

[0059] The positive electrode sheet and the negative electrode sheet are separated by a diaphragm, and the positive electrode sheet, the diaphragm, and the negative electrode sheet are stacked or wound in sequence to form an electrode group 3, and the limiting plate 1 is installed on the electrode group 3 so that the electrode ear 31 is located in the limiting hole 12, and the limiting plate 1 and the electrode group 3 are fixedly connected by gluing, and then the electrode ear 31 and the pole 212 are welded so that the position of the injection hole 211 is set corresponding to the position of the adjustment hole 11.

[0060] The cover plate 21 is welded to the shell 22, and the electrolyte is injected into the injection hole 211. After the electrolyte is completely immersed in the electrode group 3, the protective layer 13 near the adjustment hole 11 is pierced through the injection hole 211, so that the filling layer 14 releases pressure and expands, thereby filling the gap between the electrode group 3 and the cover plate 21 and the shell 22, thereby fixing the electrode group 3 and preventing the electrode group 3 from shaking in the shell 22; at the same time, the limit plate 1 can separate the pole ear 31 and the cover plate 21, so as to prevent the pole ear 31 and the cover plate 21 from overlapping to form a short circuit when the battery is vibrated, thereby causing a safety hazard.

[0061] 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 implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A battery, characterized in that: include: Limiting plate; A protection component, wherein the limit plate is located inside the protection component; The pole group is arranged inside the protection component, and the limiting plate is connected to the outer surface of the pole group. When the limiting plate is connected to the protection component, the limiting plate can be selectively expanded to fill the gap between the pole group and the protection component.

2. The battery according to claim 1, characterized in that The limiting plate is provided with an adjustment hole for enabling the limiting plate to selectively expand, and the adjustment hole is communicated with the outside.

3. The battery according to claim 1, characterized in that The pole group is connected with a pole ear, and the limiting plate is provided with a limiting hole corresponding to the position of the pole ear, so as to enable the limiting plate to be sleeved on the pole ear.

4. The battery according to claim 1, characterized in that The limiting plate comprises a protective layer and a filling layer, wherein the protective layer covers the filling layer, the protective layer is made of a flexible material, and the filling layer is made of an elastically compressible material.

5. The battery according to claim 4, characterized in that The protective layer is made of plastic material, and / or the filling layer is made of aerogel material.

6. The battery according to claim 4, characterized in that The thickness of the limiting plate (1) before compression is 0.1 mm-5 mm, and / or the thickness of the protective layer (13) is 0.02 mm-0.1 mm.

7. The battery according to claim 2, characterized in that The protection component includes a cover plate, and the limiting plate includes a first plate, and the first plate is arranged in a gap between the cover plate and the pole group.

8. The battery according to claim 7, characterized in that The cover plate is provided with a liquid injection hole, the adjustment hole is coaxially arranged with the liquid injection hole, and the aperture of the adjustment hole is smaller than the aperture of the liquid injection hole.

9. The battery according to claim 7, characterized in that The protection assembly includes a shell, and the limiting plate includes a second plate, and the second plate is arranged in a gap between the pole group and the shell.

10. The battery according to claim 9, characterized in that Two second plates are provided, and the two second plates are symmetrically arranged in the gap between the shell and the two sides of the pole group in the first direction, and one end of the two second plates on the same side is connected to the two ends of the first plate respectively.

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