CN221176294U - Pole core, battery pack and electric equipment - Google Patents

Abstract

The utility model discloses a pole core, a battery pack and electric equipment, wherein the pole core comprises: one end of the positive plate is provided with an axially extending positive thickening part, and two adjacent positive thickening parts are mutually abutted and attached; and one end of the plurality of circles of negative electrode plates, which is far away from the positive electrode thickening part, is provided with an axially extending negative electrode thickening part, and two adjacent negative electrode thickening parts are mutually abutted and attached. From this, through setting up anodal bodiness portion in the one end of anodal piece to make adjacent two anodal bodiness portions butt laminating each other, set up negative pole bodiness portion in the one end of negative pole piece, and make adjacent two negative pole bodiness portions butt cooperation each other, not only can increase the thickness of pole core terminal surface like this, but also can prevent that metal chip from getting into the inside structure of destroying of pole core from the pole core terminal surface, thereby can promote the supporting rigidity of pole core terminal surface, reduce the processing degree of difficulty of pole core.

Description

Pole core, battery pack and electric equipment

Technical Field

The utility model relates to the technical field of batteries, in particular to a pole core, a battery pack and electric equipment.

Background

The large battery pack has the advantages of high energy density, strong heat insulation capability, quick adaptation, quick charge and the like, but the manufacturing process difficulty of the large battery pack is high due to the battery structure, the process and the like, and in order to ensure that the current collecting disc and the end face of the battery are reliably welded, a single-layer empty foil tab can be folded into a double-layer for thickening, so that after the pole piece substrate is wound, an electrode face of a full-parking area can be formed on one side of the battery.

In the prior art, the folded and thickened pole piece is not an integral body, and the pole piece can be gradually extruded to cause pole piece wrinkling in the winding process by the pole lugs folded at the inner side due to the different circumferences of the two layers of pole lugs folded at the inner side during winding, so that the connection requirement of the battery face can not be ensured while the thickness of the electrode face is increased. In addition, the inner and outer coiled lugs after coiling can form a larger gap under the condition that the thickness of an active material is supported, so that the supporting rigidity of an electrode surface facing a current collecting disc can be reduced, the welding penetration wall thickness of the electrode surface can not meet the processing requirement, metal scraps can not be prevented from entering a battery, the safety of the battery structure and the operation is influenced, and the product qualification rate in the mass production of a large battery pack is low.

Disclosure of utility model

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the pole core which has higher structural stability and lower manufacturing difficulty.

The utility model further provides a battery.

The utility model further provides a battery pack.

The utility model further provides electric equipment.

According to an embodiment of the present utility model, a pole piece includes: the positive plate is wound in multiple circles along the axial direction, one end of the positive plate is provided with an axially extending positive thickening part, the positive thickening parts of the multiple circles of positive plate are distributed in the radial direction, and two adjacent negative thickening parts are mutually abutted and attached; the negative plate is wound along the axial direction to be arranged into a plurality of circles, the negative plate and the positive plate are sequentially stacked, one end, far away from the positive thickening part, of the negative plate is provided with an axially extending negative thickening part, the negative thickening parts of the negative plate are arranged along the radial direction in a plurality of circles, and two adjacent negative thickening parts are mutually abutted and attached.

From this, through setting up anodal bodiness portion in the one end of anodal piece to make adjacent two anodal bodiness portions butt laminating each other, set up negative pole bodiness portion in the one end of negative pole piece, and make adjacent two negative pole bodiness portions butt cooperation each other, not only can increase the thickness of pole core terminal surface like this, but also can prevent that metal chip from getting into the inside structure of destroying of pole core from the pole core terminal surface, thereby can promote the supporting rigidity of pole core terminal surface, reduce the processing degree of difficulty of pole core.

According to some embodiments of the utility model, the positive electrode thickening portion includes a first positive electrode thickening portion and a second positive electrode thickening portion, the second positive electrode thickening portion is disposed on a side of the first positive electrode thickening portion away from the negative electrode thickening portion, a thickness of the first positive electrode thickening portion in a radial direction is gradually increased in a direction away from the negative electrode thickening portion, a thickness of the second positive electrode thickening portion in a radial direction is unchanged, a distance between two adjacent first positive electrode thickening portions is gradually closer in a direction away from the negative electrode thickening portion, and the two adjacent second positive electrode thickening portions are abutted against each other.

According to some embodiments of the utility model, the negative electrode thickening portion includes a first negative electrode thickening portion and a second negative electrode thickening portion, the second negative electrode thickening portion is disposed on a side of the first negative electrode thickening portion away from the positive electrode thickening portion, a thickness of the first negative electrode thickening portion in a radial direction is gradually increased in a direction away from the positive electrode thickening portion, a thickness of the second negative electrode thickening portion in a radial direction is unchanged, a distance between two adjacent first negative electrode thickening portions is gradually closer in a direction away from the positive electrode thickening portion, and the two adjacent second negative electrode thickening portions are abutted against each other.

According to some embodiments of the utility model, the electrode core further comprises a diaphragm, the diaphragm is wound between the positive electrode plate and the negative electrode plate and insulates the positive electrode plate and the negative electrode plate, one end of the diaphragm away from the positive electrode thickening portion exceeds the positive electrode plate, the first negative electrode thickening portion exceeds one end of the diaphragm away from the positive electrode thickening portion and is arranged at a distance from the diaphragm, and one end of the second positive electrode thickening portion away from the positive electrode thickening portion exceeds the diaphragm;

The diaphragm is kept away from the one end of negative pole bodiness portion surpass in the negative pole piece, first positive pole bodiness portion surpass the diaphragm is kept away from the one end of negative pole bodiness portion and with the diaphragm interval sets up, the second positive pole bodiness portion is kept away from the one end of negative pole extremely bodiness portion surpass in the diaphragm.

According to some embodiments of the utility model, the positive electrode sheet includes a positive electrode current collector and a positive electrode active layer coated on at least one surface in a thickness direction of the positive electrode current collector, the separator is wound on an outer side of the positive electrode active layer, the negative electrode sheet includes a negative electrode current collector and a negative electrode active layer coated on at least one surface in a thickness direction of the negative electrode current collector, and a thickness in a radial direction of the second positive electrode thickened portion is equal to a distance between axial center lines of adjacent two of the negative electrode current collectors; the thickness of the second negative electrode thickening part in the radial direction is equal to the distance between the axial center lines of the adjacent two positive electrode current collectors; wherein the radial direction is perpendicular to the axial direction.

According to some embodiments of the utility model, the positive and negative electrode thickenings are each L in length in the axial direction, L satisfying the relation: l is more than or equal to 0.2mm and less than or equal to 2.0mm.

According to some embodiments of the utility model, the thickness of the positive electrode thickening increases towards both radial sides; and/or the thickness of the negative electrode thickening part is increased towards the two radial sides.

According to some embodiments of the utility model, the thickness of the positive electrode thickening increases towards one radial side; and/or the negative electrode thickening portion is provided to increase toward one radial side.

According to some embodiments of the utility model, the electrode core further comprises a positive electrode current collecting disc and a negative electrode current collecting disc, wherein the positive electrode current collecting disc is arranged at one side of the positive electrode thickening parts far away from the negative electrode thickening parts and is electrically connected with the positive electrode thickening parts, and the negative electrode current collecting disc is arranged at one side of the negative electrode thickening parts far away from the positive electrode thickening parts and is electrically connected with the negative electrode thickening parts.

A battery according to an embodiment of the present utility model includes: the pole piece is described above.

The battery pack according to the embodiment of the utility model includes: the battery described above.

The electric equipment comprises the battery; or a battery pack as described above.

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

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic illustration of a pole piece according to an embodiment of the present utility model;

FIG. 2 is a partial cross-sectional view of a pole piece according to an embodiment of the present utility model;

FIG. 3 is a schematic view of a positive plate according to an embodiment of the present utility model;

fig. 4 is a schematic view of a negative electrode sheet according to an embodiment of the present utility model;

FIG. 5 is a cross-sectional view of a pole piece according to an embodiment of the present utility model;

fig. 6 is a cross-sectional view of a positive electrode sheet according to an embodiment of the present utility model.

Reference numerals:

100. A pole core;

10. a positive plate; 11. a positive electrode thickening portion; 111. a first positive electrode thickening portion; 112. a second positive electrode thickening portion; 12. a positive electrode current collector; 13. a positive electrode active layer;

20. A negative electrode sheet; 21. a negative electrode thickening portion; 211. a first negative electrode thickening portion; 212. a second negative electrode thickening portion; 22. a negative electrode current collector; 23. a negative electrode active layer;

30. A positive electrode current collecting plate; 31. a first positioning hole;

40. a diaphragm.

Detailed Description

Embodiments of the present utility model will be described in detail below, by way of example with reference to the accompanying drawings.

The following describes a pole core 100 according to an embodiment of the present utility model with reference to fig. 1 to 6, wherein the pole core 100 may be applied to a battery, the battery may be applied to a battery pack, the battery may also be directly applied to an electric device, and the battery pack may be applied to the electric device.

As shown in connection with fig. 1 to 6, a pole core 100 according to the present utility model may mainly include: the positive electrode plate 10 and the negative electrode plate 20, wherein the positive electrode plate 10 and the negative electrode plate 20 jointly form the electrode core 100, the positive electrode plate 10 is wound and arranged into a plurality of circles along the axial direction, the negative electrode plate 20 is wound and arranged into a plurality of circles along the axial direction, and therefore the positive electrode plate 10 and the negative electrode plate 20 can be wound into a cylindrical shape conveniently, and the electrode core 100 can be formed. The positive plate 10 and the negative plate 20 are wound into a plurality of circles along the axis, and the negative plate 20 and the positive plate 10 are sequentially stacked, so that ions and electrons can be ensured to normally move between the negative plate 20 and the positive plate 10 while the cylindrical shape of the electrode core 100 is ensured, the charge and discharge functions of the battery are normal, and the normal use of the battery can be ensured.

Further, one end of the positive plate 10 is provided with an axially extending positive thickening portion 11, the positive thickening portions 11 of the multi-turn positive plate 10 are arranged in the radial direction, and two adjacent positive thickening portions 11 are abutted against each other. Specifically, the positive electrode thickening portion 11 is disposed at one axial end of the positive electrode sheet 10 and extends in the axial direction, so that the thickness of the axial end of the positive electrode sheet 10 can be increased, the supporting rigidity of the axial end of the positive electrode sheet 10 can be enhanced, and the end, close to the positive electrode thickening portion 11, of the positive electrode sheet 10 can be more reliably connected with other structures in the electrode core 100, so that the operation difficulty in the battery manufacturing process can be reduced.

Further, the adjacent two positive electrode thickened portions 11 are abutted to each other and attached to each other, so that the plurality of positive electrode thickened portions 11 can be guaranteed to be tightly attached to one axial end of the positive electrode plate 10, and the arrangement is such that on one hand, the supporting force of interaction between the adjacent two positive electrode thickened portions 11 can be generated, the tightness and the supporting rigidity between the plurality of positive electrode thickened portions 11 can be further enhanced, on the other hand, the gap between the adjacent two positive electrode thickened portions 11 at one axial end of the positive electrode plate 10 can be prevented, and thus metal scraps can be effectively prevented from entering the inside of the positive electrode plate 100 through the end face of the positive electrode plate 100 in the process of manufacturing the positive electrode plate 100. The metal scraps enter the pole core 100 to damage the structure of the pole core 100, so that the problems of short-circuit ignition and the like of the pole core 100 are easily caused, and the structural reliability and the working safety of the pole core 100 can be ensured.

Further, an axially extending negative thickening portion 21 is provided at one end of the negative electrode sheet 20 away from the positive thickening portion 11, the negative thickening portions 21 of the negative electrode sheet 20 of the plurality of turns are arranged in the radial direction, and two adjacent negative thickening portions 21 are abutted against each other. Specifically, the negative electrode thickening portion 21 is disposed at one axial end of the negative electrode sheet 20 far away from the positive electrode thickening portion 11, so that the positive electrode and the negative electrode of the electrode core 100 can be axially arranged at intervals, the positive electrode and the negative electrode of the electrode core 100 can be conveniently connected with the positive electrode and the negative electrode of an external circuit respectively, and the short circuit of the circuit caused by too short distance between the positive electrode and the negative electrode of the battery can be prevented, and the safety of the circuit can be ensured.

In addition, the negative electrode thickening portion 21 extends in the axial direction, so that the thickness of the axial end, away from the positive electrode thickening portion 11, of the negative electrode sheet 20 can be increased, the supporting rigidity of the axial end, away from the positive electrode thickening portion 11, of the negative electrode sheet 20 can be enhanced, the end, close to the negative electrode thickening portion 21, of the negative electrode sheet 20 can be connected with other structures in the electrode core 100 more reliably, and therefore the operation difficulty in the battery manufacturing process can be reduced.

Further, the adjacent two negative electrode thickening portions 21 are abutted to each other, so that the negative electrode thickening portions 21 can be guaranteed to be tightly attached to one axial end of the negative electrode plate 20, and the arrangement is such that on one hand, an interaction supporting force can be generated between the adjacent two negative electrode thickening portions 21, tightness and supporting rigidity between the plurality of negative electrode thickening portions 21 can be further enhanced, on the other hand, gaps can be prevented from being generated between the adjacent two negative electrode thickening portions 21 at one axial end of the negative electrode plate 20 far away from the positive electrode thickening portion 11, and therefore, in the process of manufacturing the pole core 100, metal scraps can be effectively prevented from entering the inside of the pole core 100 through the other end face of the pole core 100, and the structural reliability and the working safety of the pole core 100 can be further guaranteed.

Therefore, by arranging the positive electrode thickening portion 11 at one end of the positive electrode sheet 10 and enabling the adjacent two positive electrode thickening portions 11 to be abutted against each other, arranging the negative electrode thickening portion 21 at one end of the negative electrode sheet 20 and enabling the adjacent two negative electrode thickening portions 21 to be abutted against each other for matching, the axial thickness of the end face of the electrode core 100 can be increased, metal scraps can be prevented from entering the inside damage structure of the electrode core 100 from the end face of the electrode core 100, and accordingly the supporting rigidity of the end face of the electrode core 100 can be improved, and the manufacturing process difficulty of a battery can be reduced.

As shown in fig. 3 and 5, the positive electrode thickening portion 11 includes a first positive electrode thickening portion 111 and a second positive electrode thickening portion 112, the second positive electrode thickening portion 112 is disposed on a side of the first positive electrode thickening portion 111 away from the negative electrode thickening portion 21, and the thickness of the first positive electrode thickening portion 111 in the radial direction gradually increases in a direction away from the negative electrode thickening portion 21, and the thickness of the second positive electrode thickening portion 112 in the radial direction is unchanged. Specifically, the second positive electrode thickening portion 112 is provided on the side of the first positive electrode thickening portion 111 away from the negative electrode thickening portion 21, and the side of the first positive electrode thickening portion 111 away from the negative electrode thickening portion 21 can be connected with the second positive electrode thickening portion 112 while the one end of the first positive electrode thickening portion 111 is connected with the positive electrode sheet 10, so that the structural stability of the positive electrode sheet 10 can be ensured.

Further, the thickness in the radial direction of the first positive electrode thickening portion 111 is gradually increased in the direction away from the negative electrode thickening portion 21, and the thickness in the radial direction of the second positive electrode thickening portion 112 is unchanged, so that on one hand, the connection area between the first positive electrode thickening portion 111 and the second positive electrode thickening portion 112 is smooth in transition, the connection area between the first positive electrode thickening portion 111 and the second positive electrode thickening portion 112 can be prevented from generating stress concentration, the structural strength of the positive electrode thickening portion 11 is improved, on the other hand, the shape of the second positive electrode thickening portion 112 is simple, the production and processing of the second positive electrode thickening portion 112 are facilitated, the structure of the second positive electrode thickening portion 112 is more reliable, the support of the positive electrode thickening portion 11 is more reliable, one side of the end face of the electrode core 100 is smooth, and the end face of the electrode core 100 is convenient to be connected with other structures in a battery.

Further, the distance between the adjacent two first positive electrode thickened portions 111 gradually approaches in the direction away from the negative electrode thickened portion 21, so that not only the adjacent two positive electrode thickened portions 11 can be conveniently abutted against each other in the direction away from the negative electrode thickened portion 21, but also the adjacent two positive electrode thickened portions 11 can be arranged at intervals on one side close to the negative electrode thickened portion 21, so that the negative electrode sheet 20 is arranged between the adjacent two positive electrode sheets 10, the negative electrode sheet 20 and the positive electrode sheet 10 can be ensured to be sequentially laminated, and the structural and functional reliability of the electrode core 100 can be further ensured.

Further, the adjacent two second positive electrode thickened portions 112 are abutted against each other, so that on one hand, an interaction supporting force is generated between the adjacent two second positive electrode thickened portions 112 to further enhance the supporting rigidity of the positive electrode thickened portions 11, on the other hand, gaps are prevented from being generated between the adjacent two second positive electrode thickened portions 112, in the process of the pole core 100, metal scraps can be effectively prevented from entering between the adjacent two positive electrode plates 10 after passing through the space between the adjacent two second positive electrode thickened portions 112, the metal scraps can damage the structure of the positive electrode plates 10 when existing between the adjacent two positive electrode plates 10, the normal operation of the positive electrode plates 100 is affected, and the structural reliability and the operation safety of the positive electrode plates 10 can be ensured.

As shown in fig. 4 and 5, the negative electrode thickening portion 21 includes a first negative electrode thickening portion 211 and a second negative electrode thickening portion 212, the second negative electrode thickening portion 212 is provided on a side of the first negative electrode thickening portion 211 away from the positive electrode thickening portion 11, the thickness of the first negative electrode thickening portion 211 in the radial direction gradually increases in a direction away from the positive electrode thickening portion 11, and the thickness of the second negative electrode thickening portion 212 in the radial direction is unchanged. Specifically, the second negative electrode thickening portion 212 is disposed on the side of the first negative electrode thickening portion 211 away from the positive electrode thickening portion 11, so that the side of the first negative electrode thickening portion 211 away from the positive electrode thickening portion 11 can be connected with the second negative electrode thickening portion 212 while one end of the first negative electrode thickening portion 211 is connected with the negative electrode sheet 20, and structural stability of the negative electrode sheet 20 can be ensured.

Further, the thickness in the radial direction of the first negative electrode thickening portion 211 is gradually increased in the direction away from the positive electrode thickening portion 11, and the thickness in the radial direction of the second negative electrode thickening portion 212 is unchanged, so that on one hand, the connection area between the first negative electrode thickening portion 211 and the second negative electrode thickening portion 212 is smoothly transited, the connection area between the first negative electrode thickening portion 211 and the second negative electrode thickening portion 212 can be prevented from generating stress concentration, the structural strength of the negative electrode thickening portion 21 is improved, on the other hand, the shape of the second negative electrode thickening portion 212 is simple, the production and processing of the second negative electrode thickening portion 212 are facilitated, the structure of the second negative electrode thickening portion 212 is more reliable, the support of the negative electrode thickening portion 21 is more reliable, one side of the end face of the pole core 100 is smooth, and the end face of the pole core 100 is convenient to be connected with other structures in a battery.

Further, the distance between the two adjacent first negative electrode thickened portions 211 gradually approaches in the direction away from the positive electrode thickened portion 11, so that not only the two adjacent negative electrode thickened portions 21 can be conveniently abutted against each other in the direction away from the positive electrode thickened portion 11, but also the two adjacent negative electrode thickened portions 21 can be arranged at intervals on one side close to the positive electrode thickened portion 11, so that the positive electrode sheet 10 is arranged between the two adjacent negative electrode sheets 20, and therefore the negative electrode sheet 20 and the positive electrode sheet 10 can be sequentially stacked, and further the structural and functional reliability of the electrode core 100 can be ensured.

Further, the two adjacent second negative electrode thickened portions 212 are abutted to each other, so that on one hand, an interaction supporting force is generated between the two adjacent second negative electrode thickened portions 212 to further enhance the supporting rigidity of the negative electrode thickened portions 21, on the other hand, gaps are prevented from being generated between the two adjacent second negative electrode thickened portions 212, in the manufacturing process of the battery, metal scraps can be effectively prevented from entering between the two adjacent negative electrode plates 20 after passing through the space between the two adjacent second negative electrode thickened portions 212, the structure of the negative electrode plates 20 is damaged due to the fact that the metal scraps exist between the two adjacent negative electrode plates 20, normal operation of the pole core 100 is affected, and the structural reliability and the operation safety of the negative electrode plates 20 can be guaranteed due to the arrangement.

As shown in fig. 2 and 5, the electrode core 100 further includes a diaphragm 40, the diaphragm 40 is wound between the positive electrode plate 10 and the negative electrode plate 20, and insulates the positive electrode plate 10 and the negative electrode plate 20 from each other, so that the contact between the positive electrode plate 10 and the negative electrode plate 20 is prevented, the end of the diaphragm 40, which is far away from the positive electrode thickening portion 11, exceeds the positive electrode plate 10, the end of the diaphragm 40, which is far away from the positive electrode thickening portion 11, can be ensured to play a protective role on the positive electrode plate 10, the end of the first negative electrode thickening portion 211, which exceeds the diaphragm 40, which is far away from the positive electrode thickening portion 11, is arranged at intervals with the diaphragm 40, and thus, the diaphragm 40 can be ensured to separate the first negative electrode thickening portion 211 from the end of the positive electrode plate 10, which is far away from the positive electrode thickening portion 11, so that the positive electrode plate 10 and the negative electrode plate 20 are prevented from contacting, and the working safety of the electrode core 100 is ensured.

Further, the end of the second negative electrode thickening portion 212 far away from the positive electrode thickening portion 11 exceeds the diaphragm 40, so that two adjacent second negative electrode thickening portions 212 can be guaranteed to be abutted against each other, gaps are prevented from being generated between the two adjacent second negative electrode thickening portions 212, metal chips enter the pole core 100 through the gaps to puncture the diaphragm 40, the protection effect of the second negative electrode thickening portions 212 on the diaphragm 40 can be guaranteed, and the structural reliability and the working safety of the pole core 100 are guaranteed.

As shown in fig. 5, the end of the diaphragm 40 away from the negative electrode thickening portion 21 exceeds the negative electrode sheet 20, so that the diaphragm 40 can protect the negative electrode sheet 20 at the end away from the positive electrode thickening portion 11, the first positive electrode thickening portion 111 exceeds the end of the diaphragm 40 away from the negative electrode thickening portion 21, and is arranged at intervals with the diaphragm 40, so that the diaphragm 40 can separate the first positive electrode thickening portion 111 from the end of the negative electrode sheet 20 away from the negative electrode thickening portion 21, the negative electrode sheet 20 and the positive electrode sheet 10 are prevented from contacting, and the working safety of the electrode core 100 is ensured.

Further, the end of the second anode thickening portion 112 far away from the cathode thickening portion 21 exceeds the diaphragm 40, so that two adjacent second anode thickening portions 112 can be guaranteed to be abutted against each other, gaps are prevented from being generated between the two adjacent second anode thickening portions 112, metal chips enter the pole core 100 through the gaps to pierce the diaphragm 40, the protection effect of the second anode thickening portions 112 on the diaphragm 40 can be guaranteed, and the structural reliability and the working safety of the pole core 100 are guaranteed.

As shown in fig. 2, 5 and 6, the positive electrode sheet 10 includes a positive electrode current collector 12 and a positive electrode active layer 13, the positive electrode active layer 13 is coated on at least one surface in the thickness direction of the positive electrode current collector 12, the separator 40 is wound on the outside of the positive electrode active layer 13, the negative electrode sheet 20 includes a negative electrode current collector 22 and a negative electrode active layer 23, the negative electrode active layer 23 is coated on at least one surface in the thickness direction of the negative electrode current collector 22, and the separator 40 is wound on the outside of the negative electrode active layer 23. Specifically, the positive electrode active layer 13 is coated on at least one surface of the positive electrode current collector 12 in the thickness direction, so that the positive electrode active layer 13 can protect the positive electrode current collector 12, can effectively inhibit the contact reaction of active materials and electrolyte, and the negative electrode active layer 23 is coated on at least one surface of the negative electrode current collector 22 in the thickness direction, so that the negative electrode active layer 23 can improve the conductivity of the negative electrode current collector 22 on the negative electrode sheet 20, and can relieve the volume expansion of the negative electrode sheet 20 in charge-discharge cycles.

Further, the thickness in the radial direction of the second positive electrode thickening portion 112 is equal to the distance between the axial center lines of the adjacent two negative electrode current collectors 22, and the thickness in the radial direction of the second negative electrode thickening portion 212 is equal to the distance between the axial center lines of the adjacent two positive electrode current collectors 12, so that the thickness in the radial direction of the second positive electrode thickening portion 112 and the thickness in the radial direction of the second negative electrode thickening portion 212 can both include the sum of the thicknesses in the radial direction of the positive electrode sheet 10, the negative electrode sheet 20, the positive electrode active layer 13, the negative electrode active layer 23 and the diaphragm 40, so that in the structure that the positive electrode sheet 10 and the negative electrode sheet 20 of the electrode core 100 are wound into a plurality of turns along the axis, the normal charge and discharge function of the electrode core 100 can be ensured, and the abutting joint between the adjacent two positive electrode thickening portions 11 and the adjacent two negative electrode thickening portions 21 can be ensured, so that gaps can be prevented from being generated on the end faces of the electrode core 100, metal fragments generated in the battery process can be effectively prevented from entering the inside the electrode core 100, the diaphragm 40 is pierced, the positive electrode sheet 10 and the negative electrode sheet 20 are directly contacted, and the short circuit of the electrode core 100 is caused, and the safety in the production and the safety of the core can be ensured.

In the embodiment of the utility model, the radial direction of the pole core 100 is perpendicular to the axial direction, so that the end surface of the pole core 100 made of the positive electrode thickening part 11 and the negative electrode thickening part 21 is perpendicular to the axial direction of the pole core 100, thereby enabling the end surface of the pole core 100 to be smoother, facilitating the connection between the end surface of the pole core 100 and other structures, and improving the structural accuracy of the pole core 100.

In the embodiment of the utility model, when the positive electrode sheet 10 and the negative electrode sheet 20 of the electrode core 100 are subjected to the axial winding process, active materials can be increased and reduced on the positive electrode active layer 13 and the negative electrode active layer 23, so that the rolling materials of the positive electrode sheet 10 and the negative electrode sheet 20 in the winding process are ensured to be smooth, the positive electrode sheet 10 and the negative electrode sheet 20 can be prevented from running out, the wound electrode core 100 can be ensured to be in a cylindrical shape, the normal operation of the subsequent production process of the battery is ensured, and the production efficiency of the battery is facilitated to be improved.

As shown in fig. 6, the positive electrode thickening 11 and the negative electrode thickening 21 have lengths L in the axial direction, and L satisfies the relation: l is more than or equal to 0.2mm and less than or equal to 2.0mm. Specifically, if the axial lengths of the positive electrode thickening portion 11 and the negative electrode thickening portion 21 are set to be less than 0.2mm, the lengths of the positive electrode thickening portion 11 and the negative electrode thickening portion 21 in the axial direction are too short, and the structural strength of the positive electrode thickening portion 11 and the negative electrode thickening portion 21 at the end face of the electrode core 100 cannot be ensured, so that when the positive electrode thickening portion 11 and the negative electrode thickening portion 21 are connected with other structures in the battery, the supporting rigidity of the end face of the electrode core 100 against the other structures in the battery cannot be ensured, which easily results in the other structures in the battery contacting the positive electrode sheet 10 and the negative electrode sheet 20 at the same time, and the risk of short circuit of the battery is caused.

Further, if the axial length of the positive electrode thickening portion 11 and the negative electrode thickening portion 21 is set to be greater than 2.0mm, although the supporting rigidity of the end face of the electrode core 100 against other structures in the battery can be ensured, the excessive length of the positive electrode thickening portion 11 and the negative electrode thickening portion 21 in the axial direction not only causes waste of raw materials for producing the positive electrode sheet 10 and the negative electrode sheet 20, but also shortens the axial length of the positive electrode sheet 10 and the negative electrode sheet 20 in the electrode core 100, reduces the volumes of the positive electrode sheet 10 and the negative electrode sheet 20 in the electrode core 100 which participate in charging and discharging portions, and further affects the charging capability and discharging capability of the battery.

Therefore, the length of the positive electrode thickening part 11 and the negative electrode thickening part 21 in the axial direction is between 0.2mm and 2.0mm, so that the supporting rigidity of the positive electrode thickening part 11 and the negative electrode thickening part 21 in the electrode core 100 can be ensured, and the waste of raw materials for producing the electrode core 100 can be avoided and the resources can be saved on the premise that the normal function of the electrode core 100 is ensured.

According to some embodiments of the present utility model, the thickness of the positive electrode thickening portion 11 is increased toward two radial sides of the positive electrode sheet 10, so that the size of the positive electrode thickening portion 11 in the radial direction of the positive electrode sheet 10 can be increased, and after the positive electrode sheet 10 is wound for a plurality of turns, the positive electrode thickening portions 11 at one radial end of the electrode core 100 can be tightly attached to each other, so as to improve the tightness and the supporting rigidity of the axial end face of the positive electrode thickening portion 11.

According to other embodiments of the present utility model, the thickness of the negative electrode thickening portion 21 is increased toward both sides of the radial direction of the negative electrode sheet 20, so that the size of the negative electrode thickening portion 21 in the radial direction of the negative electrode sheet 20 can be increased, and after the negative electrode sheet 20 is wound for a plurality of turns, the plurality of negative electrode thickening portions 21 at one radial end of the electrode core 100 can be closely attached to improve the tightness and the supporting rigidity of the axial end face of the negative electrode thickening portion 21.

According to still other embodiments of the present utility model, the thickness of the positive electrode thickening portion 11 is increased toward both sides in the radial direction of the positive electrode sheet 10, and the thickness of the negative electrode thickening portion 21 is increased toward both sides in the radial direction of the negative electrode sheet 20. After the positive electrode sheet 10 and the negative electrode sheet 20 are wound in a plurality of turns, the positive electrode thickened portions 11 at one end in the radial direction of the electrode core 100 can be tightly attached, and the negative electrode thickened portions 21 at the other end can be tightly attached, so that the tightness and the supporting rigidity of the axial end face of the electrode core 100 can be improved.

According to some embodiments of the present utility model, the thickness of the positive electrode thickening portion 11 is increased toward one radial side of the positive electrode sheet 10, so that the size of the positive electrode thickening portion 11 in the radial direction of the positive electrode sheet 10 can be increased, and after the positive electrode sheet 10 is wound for a plurality of turns, the positive electrode thickening portions 11 at one radial end of the electrode core 100 can be closely attached to improve the tightness and the supporting rigidity of the axial end face of the positive electrode thickening portion 11.

According to other embodiments of the present utility model, the thickness of the negative electrode thickening portion 21 is increased toward one side in the radial direction of the negative electrode sheet 20, so that the size of the negative electrode thickening portion 21 in the radial direction of the negative electrode sheet 20 can be increased, and after the negative electrode sheet 20 is wound for a plurality of turns, the plurality of negative electrode thickening portions 21 at one end in the radial direction of the electrode core 100 can be closely attached to each other, so as to improve the tightness and the supporting rigidity of the axial end face of the negative electrode thickening portion 21.

According to still other embodiments of the present utility model, the thickness of the positive electrode thickening portion 11 is increased toward one side in the radial direction of the positive electrode sheet 10, and the thickness of the negative electrode thickening portion 21 is increased toward one side in the radial direction of the negative electrode sheet 20. After the positive electrode sheet 10 and the negative electrode sheet 20 are wound in a plurality of turns, the positive electrode thickened portions 11 at one end in the radial direction of the electrode core 100 can be tightly attached, and the negative electrode thickened portions 21 at the other end can be tightly attached, so that the tightness and the supporting rigidity of the axial end face of the electrode core 100 can be improved.

As shown in fig. 1, the electrode core 100 further includes a positive current collecting plate 30 and a negative current collecting plate, the positive current collecting plate 30 is disposed on a side of the plurality of positive thickened portions 11 away from the negative thickened portions 21 and is electrically connected with the plurality of positive thickened portions 11, and the negative current collecting plate is disposed on a side of the plurality of negative thickened portions 21 away from the positive thickened portions 11 and is electrically connected with the plurality of negative thickened portions 21. Specifically, the current collecting disc has good conductivity, can play a role of connecting devices in a circuit, can transmit signals of a plurality of devices to other devices, and can combine different signals to form a more complex circuit. In the embodiment of the present utility model, the positive electrode current collecting disc 30 is disposed on a side of the plurality of positive electrode thickened portions 11 away from the negative electrode thickened portions 21 and is electrically connected with the plurality of positive electrode thickened portions 11, so that current on the positive electrode sheet 10 can be collected and output, and charge and discharge capabilities of the electrode core 100 are ensured, and the negative electrode current collecting disc is disposed on a side of the plurality of negative electrode thickened portions 21 away from the positive electrode thickened portions 11 and is electrically connected with the plurality of negative electrode thickened portions 21, so that current in a circuit can be collected and input to the negative electrode sheet 20, and charge and discharge capabilities of the electrode core 100 are ensured.

As shown in fig. 1, the center of the positive current collecting disc 30 is provided with a first positioning hole 31, the first positioning hole 31 is matched with the end surface axis of the pole core 100 on the side far away from the negative electrode thickening portion 21, so that the positive current collecting disc 30 and the pole core 100 are positioned quickly, the installation efficiency of the positive current collecting disc 30 and the pole core 100 can be improved, the center of the negative current collecting disc is provided with a second positioning hole, the second positioning hole is matched with the end surface axis of the pole core 100 on the side far away from the positive electrode thickening portion 11, so that the negative current collecting disc and the pole core 100 are positioned quickly, and the installation efficiency of the negative current collecting disc and the pole core 100 can be improved.

Further, the connection manner between the positive electrode current collecting disc 30 and the plurality of positive electrode thickened portions 11 includes, but is not limited to, welding, the axial length of the positive electrode thickened portions 11 can meet the welding penetration wall thickness requirement of the positive electrode current collecting disc 30 and the positive electrode thickened portions 11, the connection manner between the negative electrode current collecting disc and the plurality of negative electrode thickened portions 21 includes, but is not limited to, welding, the axial length of the negative electrode thickened portions 21 can meet the welding penetration wall thickness requirement of the negative electrode current collecting disc and the negative electrode thickened portions 21, so that reliable welding of the positive electrode current collecting disc 30 and the positive electrode thickened portions 11 can be ensured, and reliable welding of the negative electrode current collecting disc and the negative electrode thickened portions 21 can be ensured.

By the arrangement, the welding parameter requirements on the positive electrode current collecting disc 30 and the positive electrode thickening part 11 can be reduced, the welding efficiency of the positive electrode current collecting disc 30 and the positive electrode thickening part 11 is improved, on one hand, insufficient welding between the positive electrode current collecting disc 30 and the positive electrode thickening part 11 caused by small welding current flow can be prevented, the internal resistance of the electrode core 100 is increased, the charge and discharge capacity of the electrode core 100 is affected, on the other hand, the risk that the diaphragm 40 is damaged by heat due to overlarge welding current and the short circuit of the electrode core 100 is easily caused can be prevented, and therefore excellent processing conditions can be provided for the positive electrode current collecting disc 30 and the positive electrode thickening part 11, and the connection function reliability of the positive electrode current collecting disc 30 and the positive electrode thickening part 11 can be ensured.

So set up, can reduce the welding parameter requirement to negative pole current collecting disc and negative pole bodiness portion 21, promote the welding efficiency of negative pole current collecting disc and negative pole bodiness portion 21, on the one hand can prevent that the welding current from flowing through to be little to lead to the insufficient welding between negative pole current collecting disc and the negative pole bodiness portion 21, lead to the inside increase of pole core 100 resistance, thereby influence the charge-discharge ability of pole core 100, on the other hand can prevent that the too big heat damage that leads to diaphragm 40, the risk of easily causing pole core 100 short circuit, thereby can provide outstanding processing condition for negative pole current collecting disc and negative pole bodiness portion 21, can guarantee the connected function reliability of negative pole current collecting disc and negative pole bodiness portion 21.

According to the embodiment of the utility model, the electrode core 100 can be applied to a battery, the manufacturing process steps of the battery adopting the electrode core 100 are that a positive thickening part 11 with the width of 0.2mm-2.0mm is designed at the single side edge of a normal substrate of the positive current collector 12 when the battery is manufactured, a negative thickening part 21 with the width of 0.2mm-2.0mm is designed at the single side edge of the normal substrate of the positive current collector 12, the sum of the thicknesses of the positive thickening part 11 and the negative thickening part 21 is the sum of the positive plate 10 and the negative plate 20 coated with an active material flat layer and then the separator 40, when the active material is coated, the peripheral area of the positive plate 10 and the peripheral area of the negative plate 20 except the positive thickening part 11 and the negative thickening part 21 are required to be coated, when the electrode core 100 is wound, the positive electrode plate 10 and the negative electrode plate 20 are sequentially laminated and wound, the two adjacent positive electrode thickening parts 11 are mutually attached when the positive electrode plate 10 is wound, the two adjacent negative electrode thickening parts 21 are mutually attached when the negative electrode plate 20 is wound, after winding, the two ends of the electrode core 100 form a whole monopole electrode surface without gaps, the diaphragm 40 is hidden in the electrode core 100, an insulating effect between the positive electrode and the negative electrode is formed, the wound monopole electrode surface has better supporting rigidity, and meanwhile, the welding penetration wall thickness requirement of a current collecting disc can be met.

The battery according to the embodiment of the utility model can mainly comprise the pole core 100, and the pole core 100 is arranged in the battery, so that the structural safety and reliability of the battery can be improved, the production cost of the battery can be reduced, and the production efficiency of the battery can be improved.

The battery pack according to the embodiment of the utility model mainly comprises the battery, the battery pack provided with the battery in the embodiment can be applied to electric equipment, the structural safety of the battery pack is high, the manufacturing difficulty of the battery pack is reduced, and therefore the product yield and the production efficiency of the battery pack can be improved, and stable power supply can be provided for the electric equipment.

Furthermore, the battery can also be directly applied to the power utilization device, so that the safety and reliability of the electric equipment can be further improved, and the energy density of the power utilization device can be improved.

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.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative 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 utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.

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 (12)

1. A pole piece, comprising:

The positive plate (10), the positive plate (10) is coiled and arranged into a plurality of circles along the axial direction, one end of the positive plate (10) is provided with an axially extending positive thickening part (11), the positive thickening parts (11) of the plurality of circles of positive plate (10) are arranged in the radial direction, and two adjacent positive thickening parts (11) are mutually abutted and attached;

Negative pole piece (20), negative pole piece (20) are coiled along the axial and are set up into many circles, negative pole piece (20) with positive pole piece (10) range upon range of setting in proper order, negative pole piece (20) are kept away from the one end of positive pole thickening portion (11) is provided with the negative pole thickening portion (21) of axial extension, many circles negative pole piece (20) negative pole thickening portion (21) are arranged in radial, adjacent two negative pole thickening portion (21) butt laminating each other.

2. The electrode core according to claim 1, characterized in that the positive electrode thickening portion (11) comprises a first positive electrode thickening portion (111) and a second positive electrode thickening portion (112), the second positive electrode thickening portion (112) is disposed on one side of the first positive electrode thickening portion (111) away from the negative electrode thickening portion (21), the thickness of the first positive electrode thickening portion (111) in the radial direction is gradually increased in the direction away from the negative electrode thickening portion (21), the thickness of the second positive electrode thickening portion (112) in the radial direction is unchanged, the distance between two adjacent first positive electrode thickening portions (111) is gradually closed in the direction away from the negative electrode thickening portion (21), and the two adjacent second positive electrode thickening portions (112) are abutted against each other.

3. The electrode core according to claim 2, characterized in that the negative electrode thickening portion (21) comprises a first negative electrode thickening portion (211) and a second negative electrode thickening portion (212), the second negative electrode thickening portion (212) is disposed on one side of the first negative electrode thickening portion (211) away from the positive electrode thickening portion (11), the thickness of the first negative electrode thickening portion (211) in the radial direction gradually increases in the direction away from the positive electrode thickening portion (11), the thickness of the second negative electrode thickening portion (212) in the radial direction is unchanged, the distance between two adjacent first negative electrode thickening portions (211) gradually approaches in the direction away from the positive electrode thickening portion (11), and the two adjacent second negative electrode thickening portions (212) are abutted against each other.

4. A pole piece according to claim 3, further comprising a separator (40), the separator (40) being wound between the positive pole piece (10) and the negative pole piece (20) and insulating the positive pole piece (10) and the negative pole piece (20), an end of the separator (40) remote from the positive pole thickening portion (11) being beyond the positive pole piece (10), the first negative pole thickening portion (211) being beyond an end of the separator (40) remote from the positive pole thickening portion (11) and being spaced apart from the separator (40), an end of the second negative pole thickening portion (212) remote from the positive pole thickening portion (11) being beyond the separator (40);

The diaphragm (40) is far away from one end of the negative electrode thickening part (21) and exceeds the negative electrode plate (20), the first positive electrode thickening part (111) is far away from one end of the diaphragm (40) and is arranged at intervals with the diaphragm (40), and the second positive electrode thickening part (112) is far away from one end of the negative electrode thickening part (21) and exceeds the diaphragm (40).

5. The positive electrode core according to claim 4, characterized in that the positive electrode sheet (10) includes a positive electrode current collector (12) and a positive electrode active layer (13), the positive electrode active layer (13) is coated on at least one surface in a thickness direction of the positive electrode current collector (12), the separator (40) is wound on an outer side of the positive electrode active layer (13), the negative electrode sheet (20) includes a negative electrode current collector (22) and a negative electrode active layer (23), the negative electrode active layer (23) is coated on at least one surface in a thickness direction of the negative electrode current collector (22), and a thickness of the second positive electrode thickening portion (112) in a radial direction is equal to a distance between axial center lines of adjacent two of the negative electrode current collectors (22);

The thickness of the second negative electrode thickening part (212) in the radial direction is equal to the distance between the axial center lines of the adjacent two positive electrode current collectors (12);

wherein the radial direction is perpendicular to the axial direction.

6. The electrode core according to claim 1, characterized in that the positive electrode thickening (11) and the negative electrode thickening (21) are each L in length in the axial direction, L satisfying the relation: l is more than or equal to 0.2mm and less than or equal to 2.0mm.

7. -The pole piece according to claim 1, characterized in that the thickness of the positive thickening (11) is increased towards both radial sides; and/or the thickness of the negative electrode thickening portion (21) is increased toward both radial sides.

8. -The pole piece according to claim 1, characterized in that the thickness of the positive thickening (11) is arranged increasing towards one radial side; and/or the negative electrode thickening (21) is arranged to increase toward one radial side.

9. The pole core according to claim 1, further comprising a positive current collecting plate (30) and a negative current collecting plate, wherein the positive current collecting plate (30) is disposed on a side of the plurality of positive thickened portions (11) away from the negative thickened portions (21) and is electrically connected with the plurality of positive thickened portions (11), and the negative current collecting plate is disposed on a side of the plurality of negative thickened portions (21) away from the positive thickened portions (11) and is electrically connected with the plurality of negative thickened portions (21).

10. A battery comprising a pole piece according to any one of claims 1-9.

11. A battery comprising the battery of claim 10.

12. A powered device, comprising: the battery of claim 10; or the battery pack of claim 11.