CN220209239U - Insulating sheet and battery cell having the same - Google Patents

Abstract

The utility model discloses an insulating sheet and a battery cell with the same, wherein the insulating sheet is arranged between a shell of the battery cell and a current collector, at least part of the surface of one side of the insulating sheet, which is far away from the current collector, is formed into a current guiding surface, and the current guiding surface is an inclined surface extending downwards in an inclined manner. According to the insulating sheet, the flow guide surface extending obliquely downwards is formed on the surface of one side, away from the current collector, of the insulating sheet, so that electrolyte gathered between the insulating sheet and the shell can be discharged, the probability of corrosion of the shell can be reduced, and the use safety of the battery can be improved.

Description

Insulating sheet and battery cell having the same

Technical Field

The utility model relates to the technical field of batteries, in particular to an insulating sheet and a battery monomer with the insulating sheet.

Background

With the increasing maturity of lithium ion battery technology, lithium ion batteries are widely used in the field of electric automobiles as power batteries. The insulating sheet of the lithium ion battery is also an important component of the lithium ion power battery, is positioned inside the battery core and is connected with the shell and the current collecting disc, and is used for keeping a circuit breaking state and ensuring the insulativity of the battery. The electrolyte in the lithium ion battery has a volatile characteristic, when the electrolyte appears between the insulating sheet and the shell, the electrolyte cannot be effectively led out due to the gentle structure of the insulating sheet, so that the electrolyte is accumulated, side reactions between the electrolyte and the metal shell can be easily initiated, the shell is corroded, and even the safe use of the battery core is influenced.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model aims to provide an insulating sheet which can reduce the corrosion probability of a shell and improve the use safety of a battery.

The utility model also provides a battery cell with the insulating sheet.

According to the insulating sheet of the first aspect of the utility model, the insulating sheet is arranged between the shell of the battery cell and the current collector, at least part of the surface of one side of the insulating sheet, which is away from the current collector, is formed into a flow guiding surface, and the flow guiding surface is an inclined surface extending downwards in an inclined manner.

According to the insulating sheet, the flow guide surface extending obliquely downwards is formed on the surface of one side, away from the current collector, of the insulating sheet, so that electrolyte gathered between the insulating sheet and the shell can be discharged, the probability of corrosion of the shell can be reduced, and the use safety of the battery can be improved.

According to some embodiments of the utility model, the insulating sheet is formed with a through hole penetrating the insulating sheet in a thickness direction of the insulating sheet.

According to some embodiments of the utility model, the flow guiding surface extends obliquely downward in a radial inside-out direction of the through hole.

According to some embodiments of the utility model, the one side surface of the insulating sheet is provided with a groove penetrating through the edge of the insulating sheet, and the bottom wall of the groove is formed as the flow guiding surface.

According to some embodiments of the utility model, the number of grooves is a plurality, and a plurality of grooves is arranged around the through hole.

According to some embodiments of the utility model, the groove extends in a radial direction of the through hole, the groove gradually increasing in width in a direction from inside to outside in the radial direction of the through hole.

According to some embodiments of the utility model, the through hole is a round hole and comprises a first hole section and a second hole section which are coaxially connected, the first hole section is connected to one side of the second hole section, which is away from the current collector, and the diameter of the first hole section is smaller than that of the second hole section.

According to some embodiments of the utility model, the flow guiding surface is located radially outside the second bore section in a projection plane perpendicular to the axis of the through bore.

The battery cell according to the second aspect of the present utility model includes a case, a current collector, and an insulating sheet according to the first aspect of the present utility model, the insulating sheet being provided between the current collector and an inner wall surface of the case.

According to the battery cell, the insulating sheet of the first aspect is arranged, so that the overall performance of the battery cell is improved.

According to some embodiments of the utility model, the current collector has a weld area, and the flow guiding surface is disposed opposite to the weld area in a thickness direction of the insulating sheet.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

Fig. 1 is a schematic view of an insulating sheet according to an embodiment of the present utility model;

fig. 2 is a top view of an insulating sheet according to an embodiment of the present utility model;

fig. 3 is a cross-sectional view of an insulating sheet according to an embodiment of the present utility model;

fig. 4 is a top view of a current collector according to an embodiment of the present utility model.

Reference numerals:

10. an insulating sheet; 11. a groove; 12. a flow guiding surface; 13. a through hole; 131. a first bore section; 132. a second bore section;

20. a current collector; 21. a welding area; 22. a non-welding region; 23. a protrusion.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

An insulating sheet 10 according to an embodiment of the first aspect of the present utility model is described below with reference to fig. 1 to 4.

As shown in fig. 1, according to the insulating sheet 10 of the first embodiment of the present utility model, the insulating sheet 10 is disposed between the case of the battery cell and the current collector 20, at least a portion of a surface of the insulating sheet 10 facing away from the current collector 20 is formed as a current guiding surface 12, and the current guiding surface 12 is a slope extending obliquely downward.

Specifically, the insulating sheet 10 is a sheet for keeping the circuit in an open state, and mainly plays an insulating role; the insulating sheet 10 has the characteristics of high temperature resistance, insulation and electrolyte corrosion resistance, and further can be made of an insulating material having high temperature resistance and electrolyte corrosion resistance, and for example, the insulating sheet 10 can be made of PP, PET, PBT, or the like. The insulating sheet 10 is disposed between the case and the current collector 20, the bottom surface of the insulating sheet 10 is in contact with the current collector 20 for insulation, and a certain gap is formed between the upper end surface of the insulating sheet 10 and the case, so that the volatilized electrolyte is accumulated between the insulating sheet 10 and the case, and corrosion of the case is caused. At this time, by providing the insulating sheet 10 such that at least a portion of the side surface facing away from the current collector 20 is formed as the current guiding surface 12, that is, the current guiding surface 12 is formed on the side surface where the electrolyte is collected, and the current guiding surface 12 is an inclined surface extending obliquely downward, the collected electrolyte can flow downward along the current guiding surface 12 and away from the surface of the case, and thus corrosion of the case can be reduced, and thus use safety of the battery can be improved. The surface of the insulating sheet 10 facing away from the current collector 20 may be partially formed with the current guiding surface 12, or may be entirely formed with the current guiding surface 12.

According to the insulating sheet 10 of the embodiment of the utility model, the diversion surface 12 extending obliquely downwards is formed on the surface of one side of the insulating sheet 10 away from the current collector 20, so that electrolyte gathered between the insulating sheet 10 and the shell can be discharged, the corrosion probability of the shell can be reduced, and the use safety of the battery can be improved.

According to some embodiments of the present utility model, as shown in fig. 1, a through hole 13 penetrating the insulating sheet 10 in the thickness direction of the insulating sheet 10 is formed on the insulating sheet 10. Specifically, the through hole 13 is used for installing a pole, and the pole can penetrate through the through hole 13 to extend out of the shell, wherein the pole is used as an electric connection part of a battery and is used for outputting or inputting electric energy of a battery monomer, and further, the through hole 13 penetrating through the insulating sheet 10 along the thickness direction of the insulating sheet 10 is formed on the insulating sheet 10, so that normal use of the battery can be ensured, and meanwhile, the pole can be sleeved on the inner side of the insulating sheet 10, and further, insulation sealing of the pole and the shell can be realized, so that use safety of the battery can be improved.

According to some embodiments of the present utility model, as shown in fig. 3, the guide surface 12 extends obliquely downward in the radial direction of the through hole 13 from inside to outside. Wherein, the guide surface 12 and the through hole 13 form a certain included angle in the axial direction, the through hole 13 is arranged at the center of the insulating sheet 10, so that electrolyte can be diffused from the center of the insulating sheet 10 to the periphery, the discharge time of the electrolyte can be reduced, the discharge efficiency of the electrolyte can be improved, the corrosion of the shell can be reduced, and the use safety of the battery can be improved.

According to some embodiments of the present utility model, as shown in fig. 1, one side surface of the insulating sheet 10 is provided with a groove 11, the groove 11 penetrates through the edge of the insulating sheet 10, and the bottom wall of the groove 11 is formed as a guide surface 12. The insulating sheet 10 is provided with a groove 11 on one side facing away from the current collector 20, and the groove 11 can form a certain interval between the insulating sheet 10 and the inner wall of the top of the shell, so that electrolyte condensed on the top wall of the shell can be collected into the groove 11 and is not contacted with the top wall of the shell, and the corrosion probability of the shell can be reduced; meanwhile, the groove 11 penetrates through the edge of the insulating sheet 10, the bottom wall of the groove 11 is formed into the guide surface 12, electrolyte can be led out through the guide surface 12 after being collected, electrolyte accumulated liquid between the insulating sheet 10 and the shell can be effectively reduced, the probability of corrosion of the shell can be reduced, and the use safety of the battery is improved.

According to some embodiments of the present utility model, as shown in fig. 1-2, the number of grooves 11 is plural, and the plural grooves 11 are arranged around the through hole 13. For example, the number of the grooves 11 may be two, three or more, and the plurality of grooves 11 are arranged around the through holes 13, so that the receiving and collecting area of the grooves 11 can be increased, and the discharge amount of the electrolyte can be increased, thereby effectively preventing corrosion of the casing and improving the use safety of the battery.

According to some embodiments of the present utility model, as shown in fig. 1, the groove 11 extends in the radial direction of the through hole 13, and the width of the groove 11 gradually increases in the direction from the inside to the outside in the radial direction of the through hole 13. The cross section of the groove 11 in the radial direction of the through hole 13 from inside to outside is formed into a fan shape, so that the area of the groove 11 can be increased, and the collection amount of electrolyte can be increased, the discharge amount of the electrolyte can be increased, the probability of corrosion of a shell is reduced, and the use safety of a battery is improved; meanwhile, the flow rate of the electrolyte can be slowed down, the electrolyte can be smoothly discharged through a gap between the edge of the groove 11 and the shell, and then the electrolyte accumulation can be reduced, so that the corrosion probability of the shell can be reduced, and the use safety of the battery is improved.

According to some embodiments of the present utility model, as shown in fig. 3, the through hole 13 is a circular hole and includes a first hole section 131 and a second hole section 132 coaxially connected, the first hole section 131 is connected to a side of the second hole section 132 facing away from the current collector 20, and a diameter of the first hole section 131 is smaller than a diameter of the second hole section 132. The through hole 13 is used for installing a pole, the pole penetrates through the inner side of the through hole 13, the inner wall of the first hole section 131 is in interference fit with the pole, namely, the insulating sheet 10 presses and seals the pole through the first hole section 131, so that the sealing effect of the insulating sheet 10 on the pole can be improved, impurities are prevented from entering the battery through the through hole 13 to damage the battery, and the use safety of the battery can be improved; the pole and the current collector 20 are fixedly connected through the fixing block, so that the size of the connecting position of the pole and the current collector 20 is larger than the diameter of the pole, and the diameter of the second hole section 132 is larger than the diameter of the first hole section 131, so that the installation convenience of the insulating sheet 10 can be ensured; meanwhile, the second hole section 132 is in butt seal with the fixed block, and the lower end face of the first hole section 131 is in butt seal with the fixed block, so that the sealing effect of the insulating sheet 10 can be further improved, and the use safety of the battery is improved.

According to some embodiments of the present utility model, as shown in fig. 3, in a projection plane perpendicular to the axis of the through hole 13, the guide surface 12 is located radially outside the second hole section 132, so that the sealing insulation of the insulation sheet 10 to the post can be ensured, and thus, impurities can be prevented from entering the inside of the battery through the gap between the post and the case, and thus, the use safety of the battery can be improved.

The battery cell according to the embodiment of the second aspect of the present utility model includes a case, a current collector 20, and an insulating sheet 10 according to the embodiment of the first aspect of the present utility model, the insulating sheet 10 being disposed between the current collector 20 and an inner wall surface of the case.

The casing is a main bearing component of the battery cell, provides bearing space for the electrode assembly, the current collector 20, the insulating sheet 10 and the electrolyte, and can be used for protecting the safety of the electrode assembly; the housing may be made of various materials, such as aluminum, steel, etc. The current collector 20 is used for electrically connecting the electrode plates and the electrode posts, guiding the electrodes inside the electrode assembly to the outside, and communicating the inner and outer boundaries of the electrode assembly to realize the electrical communication of the battery.

According to the battery cell of the embodiment of the present utility model, by providing the insulating sheet 10 of the embodiment of the first aspect described above, the overall performance of the battery cell is improved.

According to some embodiments of the present utility model, as shown in fig. 4, the current collector 20 has a welding area 21, and the current guiding surface 12 is disposed opposite to the welding area 21 in the thickness direction of the insulating sheet 10. Specifically, the welding area 21 of the current collector 20 is used for connecting the pole pieces, the non-welding area 2221 of the current collector 20 is formed with the protrusion 23, the insulating sheet 10 is in abutting insulation with the protrusion 23 of the current collector 20, and the welding area 21 of the current collector 20 and the non-welding area 2221 are alternately arranged. The welding area 21 and the diversion surface 12 are oppositely arranged in the thickness direction of the insulating sheet 10, that is, the welding area 21 and the diversion surface 12 are in one-to-one correspondence, and further, by arranging the welding area 21 and the diversion surface 12 to be oppositely arranged in the axial direction of the through hole 13, the abutting part of the insulating sheet 10 and the current collector 20 can be avoided, and the insulating effect of the insulating sheet 10 is ensured.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. The insulating sheet is arranged between the shell of the battery cell and the current collector, and is characterized in that at least part of one side surface of the insulating sheet, which is away from the current collector, is formed into a diversion surface, and the diversion surface is an inclined surface extending downwards in an inclined manner.

2. The insulating sheet according to claim 1, wherein a through hole penetrating the insulating sheet in a thickness direction of the insulating sheet is formed in the insulating sheet.

3. The insulating sheet according to claim 2, wherein the flow guiding surface extends obliquely downward in a direction from inside to outside in a radial direction of the through hole.

4. An insulating sheet as claimed in claim 3, in which the one side surface of the insulating sheet is provided with a recess which passes through the edge of the insulating sheet, the bottom wall of the recess being formed as the flow guiding surface.

5. The insulating sheet of claim 4, wherein the number of said grooves is plural, and a plurality of said grooves are arranged around said through hole.

6. The insulating sheet as claimed in claim 4, wherein the grooves extend in a radial direction of the through-hole, and the width of the grooves gradually increases in a direction from inside to outside in the radial direction of the through-hole.

7. The insulating sheet of claim 2, wherein the through hole is a circular hole and comprises a first hole section and a second hole section coaxially connected, the first hole section is connected to a side of the second hole section facing away from the current collector, and the diameter of the first hole section is smaller than that of the second hole section.

8. The insulating sheet of claim 7, wherein the flow guiding surface is located radially outward of the second hole section in a projection plane perpendicular to an axis of the through hole.

9. A battery cell characterized by comprising a case, a current collector, and the insulating sheet according to any one of claims 1 to 8, the insulating sheet being provided between the current collector and an inner wall surface of the case.

10. The battery cell according to claim 9, wherein the current collector has a welding region, and the current guiding surface is disposed opposite to the welding region in a thickness direction of the insulating sheet.