Rubber sleeve for battery

Abstract

The utility model provides a rubber sleeve for a battery, the rubber sleeve is of a hollow structure, and the inner diameter of the rubber sleeve is slightly smaller than that of a rolled core or a stacked core. The roll core or the stacked core is bound through the rubber sleeve, when the roll core or the stacked core expands, the rubber sleeve has an external expansion effect on the rubber sleeve, the rubber sleeve has a binding effect on the roll core or the stacked core so as to resist expansion of the roll core or the stacked core, internal stress of the roll core or the stacked core is released to a certain degree through the external expansion rubber sleeve, so that the expansion force is small, and the service life of the roll core or the stacked core is prolonged. Therefore, the roll cores or the laminated cores are better attached, the influence of expansion of the roll cores or the laminated cores on the performance is reduced, and in addition, the situation of short circuit caused by contact between the exposed roll cores or the laminated cores and a battery shell when the exposed roll cores or the laminated cores directly enter the shell is also reduced.

Description

Technical Field

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

[0002] The battery will have expansion problems during actual use. On the one hand, during the charge and discharge process, the Li + The intercalation and deintercalation between the positive and negative electrode materials will cause a structural phase change, and the negative electrode will also expand and shrink repeatedly, resulting in the expansion of the core or stacked core. On the other hand, the formation of the SEI film during the formation process, or the rupture and reorganization of the SEI film as the cycle progresses, will cause the SEI film thickness to increase. These processes will produce gas, which will increase the gas pressure inside the battery and cause the battery to expand, showing a phenomenon of increasing thickness or expansion force during charging and reducing expansion during discharge. These expansion phenomena cause pores between the pole pieces, and the battery has problems such as black spots and increased internal resistance.

[0003] In the battery manufacturing process, the battery expansion is reduced by applying large glue to the battery pack to increase the fit between the pole pieces. However, the tape cannot be effectively restrained as the thickness of the battery changes, and the effect of the large glue is not good. Alternatively, expansion glue is used to stick on the R corner position, but the expansion glue has a short service life and the later expansion and contraction effect is not good. Utility Model Content

[0004] The technical problem to be solved by the utility model is how to effectively increase the fit between the pole pieces after the battery expands.

[0005] The utility model solves the above technical problems through the following technical means:

[0006] The utility model provides a rubber sleeve for a battery. The rubber sleeve is a hollow structure. The inner diameter of the rubber sleeve is smaller than a winding core or a stacked core. The rubber sleeve is provided with holes.

[0007] Beneficial effect: The present application restrains the core or the stacked core by a rubber sleeve, and when the core or the stacked core expands, the rubber sleeve has an outward expansion effect on the core or the stacked core, and the rubber sleeve has a restraining effect on the core or the stacked core to resist the expansion of the core or the stacked core. The internal stress of the core or the stacked core is released to a certain extent through the outward expansion rubber sleeve, so the expansion force is small, so that the core or the stacked core fits better, reducing the impact of the expansion of the core or the stacked core on the performance, and also reducing the situation where the exposed core or the stacked core contacts the battery shell when directly inserted into the shell and causes a short circuit.

[0008] Preferably, a partition pad is provided inside the rubber sleeve.

[0009] Beneficial effect: the provision of a splitting pad is beneficial for the rubber sleeve to be provided with multiple winding cores or stacked cores.

[0010] Preferably, the pore diameter is 5 to 20 μm.

[0011] Beneficial effects: Heat is generated in the core roll or stacked core during operation. The holes provided in the rubber sleeve are beneficial for heat dissipation of the core roll or stacked core and also facilitate the entry of the electrolyte to soak the electrode sheets.

[0012] Preferably, anti-slip bumps are provided inside the rubber sleeve.

[0013] Beneficial effects: The rubber sleeve is sleeved on the core roll or stacked core. Anti-slip bumps are provided to prevent the core roll or stacked core from slipping out of the rubber sleeve.

[0014] Preferably, small rings are provided on the outer side of the rubber sleeve.

[0015] Beneficial effects: In this application, by providing small rings, pulling the small rings can increase the internal space of the rubber sleeve, facilitating the insertion of the core roll or stacked core into the rubber sleeve.

[0016] Preferably, the small rings are provided on two opposite faces at the opening of the outer side of the rubber sleeve.

[0017] Preferably, the small rings are provided around the opening of the outer side of the rubber sleeve.

[0018] Preferably, the thickness of the rubber sleeve is 0.2 - 0.5 mm.

[0019] Preferably, the rubber sleeve is cylindrical or three-dimensional.

[0020] Preferably, the rubber sleeve is cube-shaped or cuboid-shaped.

[0021] Preferably, the bottom and top of the rubber sleeve are open.

[0022] The advantages of the present utility model are as follows: Compared with the prior art, the rubber sleeve in this application restrains the core roll or stacked core, reduces the resistance of the core roll or stacked core to enter the shell, effectively prevents the core roll diaphragm from being scratched or broken, and improves the battery safety. On the other hand, the rubber sleeve has the advantages of large elongation rate, good resilience, and corrosion resistance to the electrolyte. During the charge and discharge process of the battery, it is equivalent to applying an appropriate pressure to the core roll or stacked core, increasing the adhesion between the electrode sheets during the charge and discharge process, and can effectively shorten the path of Li + migration, reducing the loss of Li + and thus improving the service life of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 FIG. 45 is a schematic structural diagram of a rubber sleeve for a battery provided in Embodiment 1;

[0024] Figure 2 FIG. 49 is a schematic structural diagram of a rubber sleeve for a battery provided in Embodiment 2;

[0025] Figure 3It is a schematic structural diagram of a rubber sleeve for a battery provided by Embodiment 3;

[0026] In the figure, 10 - rubber sleeve; 11 - hole; 12 - bump; 13 - small ring; 14 - dividing pad. Specific implementation manners

[0027] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the embodiments of the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0028] For the rubber sleeve of the present invention to have a binding feeling on the wound core and stacked core, the inner diameter of the rubber sleeve needs to be smaller than that of the wound core or stacked core. Generally, the inner diameter of the rubber sleeve is 1 - 2 cm smaller than that of the wound core or stacked core, which is sufficient.

[0029] The shape of the rubber sleeve of the present invention is designed according to the shape of the wound core or stacked core. If the wound core is cylindrical, the rubber sleeve is cylindrical; if the wound core is three-dimensional, the rubber sleeve is three-dimensional. Similarly, the same applies to the stacked core.

[0030] Embodiment 1

[0031] Please refer to Figure 1 , this embodiment provides a rubber sleeve for a battery. The rubber sleeve 10 is a hollow sleeve. The inner diameter of the rubber sleeve 10 is slightly smaller than that of the wound core. The inner diameter of the rubber sleeve is 2 cm smaller than that of the wound core. The shape of the rubber sleeve 10 is cylindrical, and the top and bottom are open. The thickness of the rubber sleeve 10 is 0.4 mm.

[0032] The rubber sleeve 10 is provided with holes 11. The aperture of the holes 10 is 10 μm, which is beneficial to the dissipation of heat during the operation of the wound core and also convenient for the electrolyte to enter and soak the electrode sheets.

[0033] Anti-slip bumps 12 are provided inside the rubber sleeve 10 to prevent the wound core from slipping out of the rubber sleeve 10.

[0034] Since the inner diameter of the rubber sleeve 10 is slightly smaller than that of the wound core, when sleeving the rubber sleeve 10, the opening of the rubber sleeve 10 needs to be enlarged to sleeve the wound core into the rubber sleeve 10. Therefore, a small ring 13 is provided on the outer side of the rubber sleeve 10. The small ring 12 is provided on the opposite side of the rubber sleeve 10 as Figure 1 shown, which is beneficial to enlarging the opening of the rubber sleeve 10.

[0035] Embodiment 2

[0036] Please refer to Figure 2, this embodiment provides a rubber sleeve for a battery. The rubber sleeve 10 is a hollow sleeve. The inner diameter of the rubber sleeve 10 is slightly smaller than that of the stacked core. The inner diameter of the rubber sleeve is 1 cm smaller than that of the stacked core. The shape of the rubber sleeve 10 is rectangular, and the top and bottom are open. The thickness of the rubber sleeve 10 is 0.3 mm.

[0037] The rubber sleeve 10 is provided with holes 11. The aperture of the holes 11 is 15 μm, which is beneficial to the dissipation of heat during the operation of the wound core and also facilitates the entry of the electrolyte to soak the electrode sheets.

[0038] The inner part of the rubber sleeve 10 is provided with anti-slip bumps 12 to prevent the wound core from slipping out of the rubber sleeve 10.

[0039] Since the inner diameter of the rubber sleeve 10 is slightly smaller than that of the stacked core, when the stacked core is sleeved with the rubber sleeve 10, the opening of the rubber sleeve 10 needs to be enlarged to sleeve the stacked core into the rubber sleeve 10. Therefore, a small ring 13 is provided on the outer side of the rubber sleeve 10. The small ring 13 is provided around the outer side of the rubber sleeve 10 as Figure 2 shown, which is more conducive to enlarging the opening of the rubber sleeve 10.

[0040] Embodiment 3

[0041] Please refer to Figure 3 , this embodiment provides a rubber sleeve for a battery. The rubber sleeve 10 is a hollow sleeve. A partition pad 14 is provided inside the rubber sleeve 10 for sleeving two wound cores. The two small rubber sleeves formed by being divided into the same two have an inner diameter slightly smaller than that of the two wound cores. The inner diameter of the rubber sleeve is 1 cm smaller than that of the wound core. The shape of the rubber sleeve 10 is rectangular, and the top and bottom are open. The thickness of the rubber sleeve 10 is 0.5 mm.

[0042] The rubber sleeve is provided with holes 11. The aperture of the holes 11 is 8 μm, which is beneficial to the dissipation of heat during the operation of the wound core and also facilitates the entry of the electrolyte to soak the electrode sheets.

[0043] The inner part of the rubber sleeve 10 is provided with anti-slip bumps 12 to prevent the wound core from slipping out of the rubber sleeve 10.

[0044] Since the inner diameter of the rubber sleeve 10 is slightly smaller than that of the wound core, when the wound core is sleeved with the rubber sleeve 10, the opening of the rubber sleeve 10 needs to be enlarged to sleeve the wound core into the rubber sleeve 10. Therefore, a small ring 13 is provided on the outer side of the rubber sleeve 10. The small ring 13 is provided around the outer side of the rubber sleeve 10 as Figure 3 shown, which is more conducive to enlarging the opening of the rubber sleeve 10.

[0045] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rubber sleeve for a battery, characterized in that: The rubber sleeve (10) is a hollow structure, the inner diameter of the rubber sleeve (10) is smaller than the winding core or the stacked core, and the rubber sleeve (10) is provided with a hole (11); a partition pad (14) and anti-slip convex points (12) are provided inside the rubber sleeve (10), and a small ring (13) is provided outside the rubber sleeve (10).

2. The rubber sleeve for battery according to claim 1, characterized in that: The hole (11) has a diameter of 5 to 20 μm.

3. The rubber sleeve for battery according to claim 1, characterized in that: The small ring (13) is arranged on the opposite side of the outer side of the rubber sleeve (10).

4. The rubber sleeve for battery according to claim 1, characterized in that: The small ring (13) is arranged around the outer side of the rubber sleeve (10).

5. The rubber sleeve for battery according to claim 1, characterized in that: The thickness of the rubber sleeve (10) is 0.2-0.5 mm.

6. The rubber sleeve for battery according to claim 1, characterized in that: The rubber sleeve (10) is cylindrical or three-dimensional.

7. The rubber sleeve for battery according to claim 6, characterized in that: The bottom and top of the rubber sleeve (10) are open.

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