CN220042047U - Single battery and battery pack - Google Patents

Abstract

The utility model provides a single battery, which comprises the following components: a battery body; an insulating film coated on the outer surface of the battery body; and a protector provided at an edge of the insulating film. The utility model also provides a battery pack comprising the single battery. According to the embodiment, the protective piece is arranged on the edge of the insulating film, so that the attaching force between the insulating film and the battery body can be effectively increased, and the tensile shearing strength is further increased, so that the situation that the edge of the insulating film is scratched to cause curling and tilting in the turnover process of the single battery to influence the assembly and the insulating performance of the single battery is prevented, and the single battery can be ensured to be used normally.

Description

Single battery and battery pack

Technical Field

The utility model relates to the technical field of batteries, in particular to a single battery and a battery pack.

Background

After the single battery is prepared, a layer of insulating film is coated outside, and then the single battery can be transported and circulated through a transport vehicle, however, because the edge strength of the insulating film is relatively poor, the edge of the insulating film is easily scratched by other objects to cause curling tilting in the turnover process, and the assembly and the insulating performance of the single battery are affected.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present utility model is to provide a single battery, which effectively prevents edges of an insulating film from being scratched to cause curling and tilting.

The utility model also provides a battery pack comprising the single battery.

The single battery according to the embodiment of the utility model comprises:

a battery body;

an insulating film coated on the outer surface of the battery body;

and a protector provided at an edge of the insulating film.

According to some embodiments of the utility model, the outer surface of the battery body is concavely provided with a receiving groove, and the edge of the insulating film is disposed in the receiving groove through the protective member.

According to some embodiments of the utility model, the protective member is a protective paste filled in the accommodating groove to adhere the edge of the insulating film.

According to some embodiments of the utility model, the insulating film includes a film body and first and second film ends correspondingly connected to both ends of the film body;

the film body is wound on the outer surface of the battery body, and the first film end part and the second film end part are overlapped and are bonded in an overlapped area.

According to some embodiments of the utility model, the protector is provided at the junction of the first and second film ends.

According to some embodiments of the utility model, the insulating film is provided as a heat shrink film.

According to some embodiments of the utility model, the height of the receiving groove along the axial direction of the battery body is less than 1/10 of the axial height of the battery body itself.

According to some embodiments of the utility model, the ratio between the depth of the receiving groove along the radial direction of the battery body and the diameter of the battery body itself is 0.1% -2%.

According to some embodiments of the utility model, the depth of the accommodating groove along the radial direction of the battery body is 0.1mm-0.5mm, and the thickness of the protective glue along the radial direction of the battery body is 0.1mm-1mm.

According to some embodiments of the utility model, the protective glue is arranged flush with the notch of the receiving groove.

According to some embodiments of the utility model, the distance that the protective glue protrudes out of the slot opening of the accommodating groove is less than or equal to 0.3mm.

According to some embodiments of the utility model, the height of the accommodating groove along the axial direction of the battery body is 1mm-10mm, and the height of the protective glue along the axial direction of the battery body is 1mm-10mm.

According to some embodiments of the utility model, the insulating film has an upper edge and a lower edge, both of which are provided with the protector;

the ratio of the height between the upper edge and the top of the battery body to the axial height of the battery body is 1-15%;

the ratio of the height between the lower edge and the bottom of the battery body to the axial height of the battery body is 1-15%.

According to some embodiments of the utility model, the insulating film has an upper edge and a lower edge, both of which are provided with the protector;

the height between the upper edge and the top of the battery body is 1mm-10mm, and the height between the lower edge and the bottom of the battery body is 1mm-10mm.

According to some embodiments of the utility model, the protective member is a plastic filler layer.

The battery pack according to the embodiment of the utility model comprises the single battery.

In summary, the single battery and the battery pack provided by the embodiment of the utility model have the following technical effects:

according to the embodiment, the protective piece is arranged on the edge of the insulating film, so that the attaching force between the insulating film and the battery body can be effectively increased, and the tensile shearing strength is further increased, so that the situation that the edge of the insulating film is scratched to cause curling and tilting in the turnover process of the single battery to influence the assembly and the insulating performance of the single battery is prevented, and the single battery can be ensured to be used normally.

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 structural diagram of a single battery according to an embodiment of the present utility model;

FIG. 2 is a cross-sectional view of the interior of a cell according to an embodiment of the present utility model;

FIG. 3 is a further cross-sectional view of the interior of a cell according to an embodiment of the present utility model;

FIG. 4 is a further cross-sectional view of the interior of a cell according to an embodiment of the present utility model;

fig. 5 is a schematic structural view of a single battery in the prior art;

icon: 1-battery body, 11-holding tank, 2-insulating film, 21-upper edge, 22-lower edge, 3-protection glue.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the embodiments described herein are only for illustrating the present utility model, and are not intended to limit the scope of the present utility model in any way, as long as the present utility model is preferred. All equivalent changes in structure, shape and principle of the utility model should be covered in the scope of protection of the utility model.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, e.g., as a "connected" or "coupled" of a mechanical structure may refer to a physical connection, e.g., as a fixed connection, e.g., via a fastener, such as a screw, bolt, or other fastener; the physical connection may also be a detachable connection, such as a snap-fit or snap-fit connection; the physical connection may also be an integral connection, such as a welded, glued or integrally formed connection. "connected" or "connected" of circuit structures may refer to physical connection, electrical connection or signal connection, for example, direct connection, i.e. physical connection, or indirect connection through at least one element in the middle, so long as circuit communication is achieved, or internal communication between two elements; signal connection may refer to signal connection through a medium such as radio waves, in addition to signal connection through a circuit. The specific meaning of the above terms in embodiments of the present utility model will be understood in detail by those of ordinary skill in the art.

In order to clearly describe the respective orientations in the following embodiments, some orientation words such as the described X-direction, Y-direction, and Z-direction in the coordinate system may be used to describe the directions of indication of the operation and construction of the respective members of the present embodiment are not absolute but relative, and although these indications are appropriate when the respective members are in the positions shown in the drawings, these directions should be interpreted differently when the positions are changed to correspond to the changes.

It will be understood that, based on the same orientation, in the description of the present utility model, the terms "center", "longitudinal", "transverse", "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 orientation or positional relationships shown in the drawings are merely for convenience of description and simplicity of description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

The battery cell and the battery pack according to the embodiments of the present utility model will be described below with reference to fig. 1 to 4, and some embodiments of the present utility model will be described in detail below with reference to the accompanying drawings, in which the following embodiments and features of the embodiments may be combined with each other without conflict. In which fig. 3 is a schematic view of a structure of a conventional unit cell in which the protective paste 3 is hidden for the convenience of viewing the receiving groove 11, fig. 5 is a schematic view.

The embodiment of the utility model provides a single battery, which effectively prevents the edge of an insulating film 2 from being scratched to cause curling and tilting.

Referring to fig. 1 to 4, the single battery includes a battery body 1, an insulating film 2 and a protecting member, wherein the insulating film 2 is coated on the outer surface of the battery body 1, and the protecting member is disposed at the edge of the insulating film 2 and is used for bonding the insulating film 2 and the battery body 1. In an embodiment, the protection member may be specifically disposed at the junction of the edge of the insulating film 2 and the battery body 1.

From this, through set up the protection piece at the edge of insulating film 2, can increase the laminating power between insulating film 2 and the battery body 1 effectively, and then increase and draw and cut intensity to prevent that the battery cell from being scraped by the edge of insulating film 2 and rubbed and cause the turn-up perk and influence the assembly and the insulating properties of battery cell in turnover process, ensure that battery cell can normally use.

Further, the outer surface of the battery body 1 is concavely provided with a receiving groove 11, and the edge of the insulating film 2 is disposed in the receiving groove 11 through a protection member, and reference may be made specifically to fig. 2 and 3. Therefore, the protective piece for the edge of the insulating film 2 is placed in the accommodating groove 11, so that the circumferential outer side surface of the protective piece and the circumferential outer side surface of the insulating film 2 are arranged in a flush manner, and the protective piece is prevented from being scratched to cause tilting or falling off in the turnover process of the single battery.

Further, the protection member is a protection glue 3, and the protection glue 3 is filled in the accommodating groove 11 to bond the edge of the insulating film 2, and specific reference may be made to fig. 2 and 3. In one embodiment, two accommodating grooves 11 are provided, and the two accommodating grooves 11 are provided in one-to-one correspondence with the positions of the upper edge 21 and the lower edge 22 of the insulating film 2. From this, the edge of insulating film 2 is located holding tank 11, and the holding tank 11 is fully filled to protection glue 3, bonds insulating film 2 edge, makes insulating film 2 have great adhesive force and tensile shear strength after the protection glue 3 solidification, effectively prevents that single battery from being scraped by the edge of insulating film 2 and rubbed and cause the turn-up perk and influence single battery's assembly and insulating properties at turnover in-process.

In some embodiments, the insulating film 2 includes a film body, and a first film end and a second film end connected to opposite ends of the film body; the film body is wound on the outer surface of the battery body 1, and the first film end part and the second film end part are overlapped and are bonded in an overlapped area. Alternatively, the shape of the insulating film 2 may be specifically rectangular. Therefore, when the battery body 1 is wrapped by the insulating film 2, the film body can be wound on the outer surface of the battery body 1, and the first film end part and the second film end part are overlapped and bonded by the adhesive.

Further, the junction of first membrane tip and second membrane tip sets up the protection piece for bond first membrane tip and second membrane tip, increase the laminating power between first membrane tip and the second membrane tip effectively, and then increase and draw and cut intensity, prevent to be scratched and cause the turn-up perk.

Optionally, the upper side edge and the lower side edge of the first film end portion are also provided with protection pieces, which can be specifically arranged at the junction between the upper side edge of the first film end portion and the battery body 1 and the junction between the lower side edge of the first film end portion and the battery body 1, so as to further increase the attaching force between the first film end portion and the battery body 1, and further increase the tensile shear strength.

Optionally, the upper edge and the lower edge of the second film end part are also provided with protection pieces, which can be specifically arranged at the junction between the upper edge of the second film end part and the battery body 1 and the junction between the lower edge of the second film end part and the battery body 1, so as to further increase the attaching force between the second film end part and the battery body 1 and further increase the tensile shear strength.

In some embodiments, the insulating film 2 is configured as a heat-shrinkable film, when the battery body 1 is wrapped by the heat-shrinkable film, the object is wrapped by the heat-shrinkable film, and then hot air is blown against the object, so that the heat-shrinkable film is heated to have shrinkage performance, and can be tightly attached to the surface of the battery body 1 after natural shrinkage, thereby achieving the skin packaging effect.

In some embodiments, the height of the receiving groove 11 in the axial direction of the battery body 1 is less than 1/10 of the axial height of the battery body 1 itself. Alternatively, the height of the accommodating groove 11 along the axial direction of the battery body 1 is smaller than the axial height of the battery body 1 itself by 2/25, 3/50 or 1/25. Therefore, the protective adhesive 3 has enough cohesive force to the edge of the insulating film 2, so that the insulating film 2 has enough cohesive force and tensile shear strength, and the material consumption of the protective adhesive 3 can be saved, so that the production cost is reduced.

In some embodiments, the ratio between the depth of the receiving groove 11 in the radial direction of the battery body 1 and the diameter of the battery body 1 itself is 0.1% and 2%. Alternatively, the ratio between the depth of the receiving groove 11 in the radial direction of the battery body 1 and the diameter of the battery body 1 itself may be 0.1%, 0.5%, 1%, 1.5% or 2%. Therefore, the protective adhesive 3 can be ensured to have enough cohesive force on the edge of the insulating film 2, so that the insulating film 2 has enough cohesive force and tensile shear strength, and the protective adhesive 3 can be prevented from being scratched to cause tilting or falling of the single battery in the turnover process due to the fact that the protective adhesive 3 is too thick.

In some embodiments, the depth of the receiving groove 11 in the radial direction of the battery body 1 is 0.1mm to 0.5mm, and specific reference may be made to fig. 3, in which the depth of the receiving groove 11 in the radial direction of the battery body 1 is D1. Alternatively, the depth D1 of the receiving groove 11 may be 0.1mm, 0.2mm, 0.3mm, 0.4mm or 0.5mm, although in other embodiments, the depth D1 of the receiving groove 11 may be other values within this range.

The thickness of the protective glue 3 along the radial direction of the battery body 1 is 0.1mm-1mm, and specific reference can be made to fig. 2, wherein the thickness of the protective glue 3 along the radial direction of the battery body 1 is T1. Alternatively, the thickness T1 of the protective paste 3 may be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm, although in other embodiments, the thickness T1 of the protective paste 3 may be other values within this range.

Therefore, the depth D1 of the accommodating groove 11 is limited to be 0.1-0.5 mm, the edge of the insulating film 2 can be effectively placed in the accommodating groove 11, the protective adhesive 3 can be fully adhered to the edge of the insulating film 2, the adhesive force and the tensile shear strength at the edge of the insulating film 2 are improved, and the structural strength of the accommodating groove 11 area can be prevented from being weakened due to the fact that the depth of the accommodating groove 11 is too deep. And the thickness T1 of the protective adhesive 3 is limited to be 0.1mm-1mm, so that the protective adhesive 3 has enough cohesive force to the edge of the insulating film 2, so that the insulating film 2 has enough adhesive force and tensile shearing strength, and the protective adhesive 3 is prevented from being excessively thick to cause the single battery to be scratched to cause tilting or falling in the turnover process.

Further, the distance that the protective adhesive 3 protrudes out of the notch of the accommodating groove 11 is less than or equal to 0.3mm. Alternatively, the distance by which the protective paste 3 protrudes may be 0.1mm, 0.2mm or 0.3mm, and of course, the distance by which the protective paste 3 protrudes may be other values within this range. Therefore, the protruding distance of the protective adhesive 3 is controlled within 0.3mm, and the protective adhesive 3 is prevented from being scratched to cause tilting or falling due to the fact that the insulating film 2 has a certain thickness and can be set flush with the insulating film 2 as much as possible within 0.3mm. Alternatively, in other embodiments, the protective glue 3 and the notch of the accommodating groove 11 may be disposed flush, so that the protective glue 3 is disposed not to protrude compared to the insulating film 2, so as to prevent the protective glue 3 from being scratched.

In some embodiments, the height of the receiving groove 11 in the axial direction of the battery body 1 is 1mm to 10mm, and specific reference may be made to fig. 3, in which the height of the receiving groove 11 in the axial direction of the battery body 1 is H2. Alternatively, the height H2 of the receiving groove 11 may be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm or 10mm, although in other embodiments, the height H2 of the receiving groove 11 may be other values within this range.

The height of the protective glue 3 along the axial direction of the battery body 1 is 1mm-10mm, and specific reference can be made to fig. 2, wherein the height of the protective glue 3 along the axial direction of the battery body 1 is H1. Alternatively, the protective glue 3 height H1 may be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm or 10mm, although in other embodiments the protective glue 3 height H1 may be other values within this range.

Therefore, the height H2 of the accommodating groove 11 is limited to be 1-10 mm, the area of the accommodating groove 11 can be effectively increased, the contact area between the protective adhesive 3 and the accommodating groove 11 is increased, and the adhesive force of the protective adhesive 3 to the edge of the insulating film 2 is further improved. In addition, the height H1 of the protective adhesive 3 is limited to be 1-10 mm, so that the protective adhesive 3 has enough cohesive force to the edge of the insulating film 2, the insulating film 2 has enough adhesive force and tensile shear strength, and the material consumption of the protective adhesive 3 can be saved, so that the production cost is reduced.

In some embodiments, the insulating film 2 has an upper edge 21 and a lower edge 22, both of which, the upper edge 21 and the lower edge 22, are provided with protectors.

The ratio of the height between the upper edge 21 and the top of the battery body 1 to the axial height of the battery body 1 itself is 1% -15%. Alternatively, the ratio of the height between the upper edge 21 and the top of the battery body 1 to the axial height of the battery body 1 itself may be 1%, 5%, 10% or 15%, although in other embodiments, the ratio of the height between the upper edge 21 and the top of the battery body 1 to the axial height of the battery body 1 itself may be other values within this range.

The ratio of the height between the lower edge 22 and the bottom of the battery body 1 to the axial height of the battery body 1 itself is 1% -15%. Alternatively, the ratio of the height between the lower edge 22 and the bottom of the battery body 1 to the axial height of the battery body 1 itself may be 1%, 5%, 10% or 15%, although in other embodiments, the ratio of the height between the lower edge 22 and the bottom of the battery body 1 to the axial height of the battery body 1 itself may be other values within this range.

Therefore, the enough space reserved between the upper edge 21 and the top of the battery body 1 can be ensured to process the accommodating groove 11, the protective glue 3 can bond the upper edge 21 of the insulating film 2, and the insulating film 2 can be ensured to exert good insulating performance on the battery body 1. Moreover, the enough space reserved between the lower edge 22 and the bottom of the battery body 1 is reserved for processing the accommodating groove 11, so that the protective glue 3 can bond the lower edge 22 of the insulating film 2, and the insulating film 2 can play a good insulating property on the battery body 1.

In some embodiments, the height between the upper edge 21 and the top of the battery body 1 is 1mm-10mm, wherein the height between the upper edge 21 and the top of the battery body 1 is H3, and in some embodiments, the height H3 between the upper edge 21 and the top of the battery body 1 may be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm, although in other embodiments, the height H3 between the upper edge 21 and the top of the battery body 1 may be other values within this range.

The height between the lower edge 22 and the bottom of the battery body 1 is 1mm-10mm, wherein the height between the lower edge 22 and the bottom of the battery body 1 is H4, and in some embodiments the height H4 between the lower edge 22 and the bottom of the battery body 1 may be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm or 10mm, although in other embodiments the height H4 between the lower edge 22 and the bottom of the battery body 1 may be other values within this range.

Therefore, the height H3 between the upper edge 21 and the top of the battery body 1 is limited to be 1-10 mm, so that a sufficient space reserved between the upper edge 21 and the top of the battery body 1 can be ensured to process the accommodating groove 11, the upper edge 21 of the insulating film 2 can be bonded by the protective adhesive 3, and good insulating performance of the insulating film 2 on the battery body 1 can be ensured. And, limit the height H4 between lower limb 22 and the bottom of battery body 1 to 1mm-10mm, can guarantee to reserve sufficient space processing holding tank 11 between lower limb 22 and the bottom of battery body 1, supply protection glue 3 to bond lower limb 22 of insulating film 2, can guarantee that insulating film 2 plays good insulating properties on battery body 1 again.

In some embodiments, the protection member is a plastic filling layer formed by a low-pressure injection molding process, wherein the low-pressure injection molding process is a process of injecting a hot-melt material into the accommodating groove 11 with very low injection pressure and rapidly solidifying, and the excellent sealing property and excellent physical and chemical properties of the hot-melt material are used for achieving the effects of insulation, temperature resistance, impact resistance, vibration reduction, moisture resistance, water resistance, dust resistance, chemical corrosion resistance and the like, so that the protection function is good for the electronic components. Compared with the traditional encapsulation process (such as two-component epoxy resin or silicone encapsulation), the low-pressure injection molding process has the advantages of environmental protection, greatly improved production efficiency and reduced total cost of production.

The technical means disclosed by the scheme of the utility model is not limited to the technical means disclosed by the embodiment, and also comprises the technical scheme formed by any combination of the technical features. It should be noted that modifications and adaptations to the utility model may occur to one skilled in the art without departing from the principles of the present utility model and are intended to be within the scope of the present utility model.

Claims (15)

1. The battery cell, its characterized in that includes:

a battery body (1);

an insulating film (2), wherein the insulating film (2) is coated on the outer surface of the battery body (1);

a protector provided at an edge of the insulating film (2);

the outer surface of the battery body (1) is concavely provided with a containing groove (11), and the edge of the insulating film (2) is arranged in the containing groove (11) through the protecting piece.

2. The single battery according to claim 1, wherein the protection member is a protection glue (3), and the protection glue (3) is filled in the accommodating groove (11) to bond the edge of the insulating film (2).

3. The unit cell according to claim 1 or 2, wherein the insulating film (2) comprises a film body having a first film end and a second film end at both ends;

the film body is wound on the outer surface of the battery body (1), and the first film end part and the second film end part are overlapped and are bonded in an overlapped area.

4. A cell according to claim 3, wherein the protector is provided at the junction of the first and second membrane ends.

5. The unit cell according to claim 1 or 2, characterized in that the insulating film (2) is provided as a heat shrink film.

6. The unit cell according to claim 1 or 2, characterized in that the height of the receiving groove (11) in the axial direction of the cell body (1) is less than 1/10 of the axial height of the cell body (1) itself.

7. The unit cell according to claim 1 or 2, characterized in that the ratio between the depth of the receiving groove (11) in the radial direction of the cell body (1) and the diameter of the cell body (1) itself is 0.1% -2%.

8. The unit cell according to claim 2, characterized in that the depth of the receiving groove (11) in the radial direction of the cell body (1) is 0.1mm to 0.5mm, and the thickness of the protective paste (3) in the radial direction of the cell body (1) is 0.1mm to 1mm.

9. The cell according to claim 8, characterized in that the protective glue (3) and the notch of the receiving groove (11) are arranged flush.

10. The single battery according to claim 8, wherein the distance that the protective glue (3) protrudes out of the notch of the accommodating groove (11) is less than or equal to 0.3mm.

11. The unit cell according to claim 2, characterized in that the height of the accommodating groove (11) along the axial direction of the cell body (1) is 1mm-10mm, and the height of the protective adhesive (3) along the axial direction of the cell body (1) is 1mm-10mm.

12. The unit cell according to claim 1 or 2, characterized in that the insulating film (2) has an upper edge (21) and a lower edge (22), both the upper edge (21) and the lower edge (22) being provided with the protection member;

the ratio of the height between the upper edge (21) and the top of the battery body (1) to the axial height of the battery body (1) is 1-15%;

the ratio of the height between the lower edge (22) and the bottom of the battery body (1) to the axial height of the battery body (1) is 1-15%.

13. The unit cell according to claim 1 or 2, characterized in that the insulating film (2) has an upper edge (21) and a lower edge (22), both the upper edge (21) and the lower edge (22) being provided with the protection member;

the height between the upper edge (21) and the top of the battery body (1) is 1mm-10mm, and the height between the lower edge (22) and the bottom of the battery body (1) is 1mm-10mm.

14. The unit cell according to claim 1 or 2, wherein the protective member is a plastic filler layer.

15. Battery pack, characterized in that it comprises a single cell according to any one of claims 1-14.