CN216720016U - Roll up core, electric core and battery module - Google Patents

Abstract

The utility model provides a winding core, a battery core and a battery module. Wherein, roll up core and include: the separator separates the adjacent positive plate from the negative plate; the insulating tube is provided with a first through hole, and the positive plate, the diaphragm and the negative plate are wound on the circumferential outer side of the insulating tube; the first connecting terminal is sleeved at the upper end part of the insulating tube, and the positive plate is electrically connected with the first connecting terminal; the second connecting terminal is sleeved at the lower end part of the insulating tube, and the negative pole piece is electrically connected with the second connecting terminal. By applying the technical scheme of the utility model, the problems that the core structure in the related technology is easy to collapse and difficult to cool can be effectively solved.

Description

Roll up core, electric core and battery module

The application claims the application number as: 202111015620.9, filing date: 31/08/2021, under the name of "battery electrode sheet, battery module, and electrode sheet processing method", priority of the utility model patent in china.

Technical Field

The utility model relates to the field of batteries, in particular to a winding core, a battery core and a battery module.

Background

The interior generally includes roll up the core of traditional cylindrical electric core, rolls up the core and is formed around rolling up by positive plate, diaphragm and negative plate, can adopt the book needle when rolling up, arranges positive plate, diaphragm and negative plate after good around rolling up the needle and roll up, can take out the book needle after the completion around rolling up, and the technology degree of difficulty of taking out the book needle is great, often leads to the winding structure of inlayer to sink. The production costs of the reeling core are increased if the reeling needle is left. In addition, the current cylindrical battery core can only be cooled by an external cooling structure, and the cooling effect is limited.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide a winding core, a battery cell and a battery module, so as to solve the problems that the winding core in the related art is easy to collapse and difficult to cool.

In order to achieve the above object, according to an aspect of the present invention, there is provided a winding core including: the separator separates the adjacent positive plate from the negative plate; the insulating tube is provided with a first through hole, and the positive plate, the diaphragm and the negative plate are wound on the circumferential outer side of the insulating tube; the first connecting terminal is sleeved at the upper end part of the insulating tube, and the positive plate is electrically connected with the first connecting terminal; the second connecting terminal is sleeved at the lower end part of the insulating tube, and the negative pole piece is electrically connected with the second connecting terminal.

Furthermore, the positive plate comprises a positive plate body and a positive tab arranged on the positive plate body, the height of the positive tab is gradually increased from the innermost layer to the outermost layer, and the upper end of the positive tab is electrically connected to the side wall of the first connecting terminal; the negative pole piece includes negative pole piece body and sets up the negative pole utmost point ear on the negative pole piece body, and the height of negative pole utmost point ear is increased gradually by inlayer to outmost, and the lower extreme electric connection of negative pole utmost point ear is on second connecting terminal's lateral wall.

Further, a first groove is arranged between the upper surface of the first connecting terminal and the surface close to the insulating tube, the width of the first groove is between 1mm and 5mm, and the depth of the first groove is between 2mm and 10 mm; a second groove is arranged between the upper surface of the second connecting terminal and the surface close to the insulating tube, the width of the second groove is between 1mm and 5mm, and the depth of the second groove is between 2mm and 10 mm.

Further, the first groove is a first tapered groove which gradually shrinks from top to bottom; the second groove is a second taper groove gradually expanding from top to bottom.

Furthermore, the first connecting terminal comprises a first connecting section and a second connecting section positioned above the first connecting section, the outer diameter of the first connecting section is smaller than that of the second connecting section, and a first step surface is formed between the first connecting section and the second connecting section; the second connecting terminal comprises a third connecting section and a fourth connecting section located below the third connecting section, the outer diameter of the third connecting section is smaller than that of the fourth connecting section, and a second step surface is formed between the third connecting section and the fourth connecting section.

Further, the outer diameter of the second connecting section is between 8mm and 90mm, and the outer diameter of the first connecting section is between 4mm and 25 mm; the outer diameter of the fourth connecting section is between 8mm and 90mm, and the outer diameter of the third connecting section is between 4mm and 25 mm.

Furthermore, the first connecting terminal comprises a first connecting section and a second connecting section positioned above the first connecting section, the second connecting section is a straight cylinder section, the first connecting section is a conical cylinder section, and the outer surface of the first connecting section gradually shrinks inwards in the direction from top to bottom; the second connecting terminal includes third linkage segment and the fourth linkage segment that is located the third linkage segment below, and the fourth linkage segment is straight section of thick bamboo, and the third linkage segment is the taper cylinder section, and the surface of third linkage segment outwards expands gradually in the direction from the top down.

Further, the outer diameter of the second connecting section is between 8mm and 90mm, and the outer diameter of the first connecting section is between 4mm and 90 mm; the outer diameter of the fourth connecting section is between 8mm and 90mm, and the outer diameter of the third connecting section is between 4mm and 90 mm.

Furthermore, the first connecting terminal is of a straight-tube structure, and the thickness of the first connecting terminal is between 1mm and 15 mm; the second connecting terminal is a straight cylinder structure, and the thickness of the second connecting terminal is between 1mm and 15 mm.

According to another aspect of the present invention, there is provided a battery cell, including: a housing; roll up the core, set up in the shell, roll up the core and be foretell book core.

According to another aspect of the present invention, there is provided a battery module including: the battery cell is the battery cell, and the battery cells are electrically connected.

Further, the battery module still includes insulating joint, and insulating joint communicates the insulating tube of the book core of two electric cores, insulating joint and insulating tube sealing connection, circulation coolant in the insulating tube, perhaps the battery module still includes the cooling tube, and the cooling tube is worn to locate in the insulating tube of the book core of a plurality of electric cores, circulation coolant in the cooling tube.

By applying the technical scheme, the insulating tube is additionally arranged inside the traditional winding core, the insulating tube can play a role of winding a reel when the positive plate, the negative plate and the diaphragm are wound, the insulating tube does not need to be drawn out after winding is completed, the insulating tube is internally provided with the first through hole, and a cooling medium can flow in the first through hole to cool the inside of the winding core. When connecting a plurality of electric cores into battery module, can couple together a plurality of insulating tubes that roll up in the core in series for cooling medium can circulate and enter into every and roll up the in-core, thereby makes every roll up the core and can both be cooled down, promotes the cooling effect of battery module, has greatly improved the thermal runaway problem of electric core.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:

FIG. 1 shows a schematic structural view of one embodiment of a winding core according to the utility model;

FIG. 2 shows an enlarged schematic view of the jelly roll of FIG. 1 at A;

FIG. 3 shows an enlarged schematic view of the jelly roll of FIG. 1 at B;

FIG. 4 shows a schematic view of the positive electrode sheet of the jellyroll of FIG. 1 when unwound;

fig. 5 shows a schematic view of the structure of the negative electrode sheet of the winding core of fig. 1 when it is not wound;

FIG. 6 shows a schematic structural view of another embodiment of a reeling core according to the utility model;

fig. 7 shows a schematic structural diagram of an embodiment of a cell according to the present invention; and

fig. 8 shows a schematic structural diagram of an embodiment of a cell module according to the present invention;

wherein the figures include the following reference numerals:

20. a positive plate; 21. a positive electrode tab; 22. a positive plate body; 30. a negative plate; 31. a negative electrode tab; 32. a negative plate body; 40. a diaphragm; 50. a first connection terminal; 51. a first connection section; 52. a second connection section; 521. a first groove; 53. a first step surface; 60. a second connection terminal; 61. a third connection section; 62. a fourth connection section; 621. a second groove; 63. a second step surface; 71. a first longitudinal cut; 72. a second longitudinal cut; 100. a housing; 110. a winding core; 120. an electric core; 130. an insulating tube; 160. and (7) cooling the tube.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

The traditional mode for electric core cooling is to place in the shell of battery module behind the integrated module that becomes of electric core, plays the cooling effect through the water-cooling chamber of shell. Above-mentioned structure adopts outside conduction heat dissipation, and can not cover all points that generate heat of electricity core, and the radiating efficiency is low. In order to solve the above-mentioned problems,

as shown in fig. 1 and 6, the present application provides a winding core including: positive electrode tab 20, negative electrode tab 30, separator 40, insulating tube 130, first connection terminal 50, and second connection terminal 60. Wherein the separator 40 separates the adjacent positive electrode tab 20 and negative electrode tab 30; the insulating tube 130 has a first through hole 131, and the positive electrode sheet 20, the separator 40, and the negative electrode sheet 30 are wound around the outer side of the insulating tube 130 in the circumferential direction; a first connection terminal 50 sleeved at an upper end of the insulation tube 130, the positive plate 20 being electrically connected to the first connection terminal 50; the second connection terminal 60 is sleeved at the lower end of the insulation tube 130, and the negative electrode tab 30 is electrically connected to the second connection terminal 60.

Use the technical scheme of this embodiment, this application increases insulating tube 130 in the inside of traditional book core, and insulating tube 130 can play the effect around the spool when positive plate 20, negative pole piece 30 and diaphragm 40 are around rolling up, and when accomplishing the back around rolling up, insulating tube 130 also need not take out, and insulating tube 130's inside has first through-hole 131, can circulate cooling medium in the first through-hole 131, cools down to the inside of rolling up the core. When connecting into battery module with a plurality of electric cores, can establish ties insulating tube 130 in a plurality of book cores for cooling medium can circulate and enter into every book in-core, thereby makes every book core can both be cooled down, promotes battery module's cooling effect, has greatly improved the thermal runaway problem of electric core.

As shown in fig. 4 and 5, in the present embodiment, the positive electrode tab 20 includes a positive electrode tab body 22 and a positive electrode tab 21 disposed on the positive electrode tab body 22, the height of the positive electrode tab 21 gradually increases from the innermost layer to the outermost layer, and the upper end of the positive electrode tab 21 is electrically connected to the side wall of the first connection terminal 50; the negative electrode sheet 30 includes a negative electrode sheet body 32 and a negative electrode tab 31 disposed on the negative electrode sheet body 32, the height of the negative electrode tab 31 gradually increases from the innermost layer to the outermost layer, and the lower end of the negative electrode tab 31 is electrically connected to the side wall of the second connection terminal 60.

As shown in fig. 4 and 5, the positive electrode sheet body 22 is coated with the positive electrode coating, and the length of the positive electrode sheet body 22 is the same as that of the positive electrode tab 21, so that the positive electrode sheet 20 of the present application is a full-tab positive electrode sheet, electrons on the positive electrode sheet body 22 can flow to the first connection terminal 50 through the positive electrode tab 21, the internal resistance of the positive electrode tab 21 is reduced, and the overcurrent capacity of the positive electrode tab 21 is improved. The positive electrode tab 20 comprises a first end and a second end which are opposite in the length direction, the width of the positive electrode tab 21 is gradually increased from the first end to the second end, and a plurality of first longitudinal notches 71 which extend along the width direction of the positive electrode tab 21 are arranged on the positive electrode tab.

Correspondingly, the negative electrode plate body 32 is coated with the negative electrode coating, and the length of the negative electrode plate body 32 is the same as that of the negative electrode tab 31, so that the negative electrode plate 30 is a full-tab positive electrode plate, electrons on the negative electrode plate body 32 can flow to the second connecting terminal 60 through the negative electrode tab 31, the internal resistance of the negative electrode tab 31 is reduced, and the overcurrent capacity of the negative electrode tab 31 is improved. The negative electrode tab 30 includes a first end and a second end opposite to each other in a length direction thereof, a width of the negative electrode tab 31 gradually increases in a direction from the first end to the second end, and a plurality of second longitudinal slits 72 extending in a width direction of the negative electrode tab 31 are provided.

Note that, as shown in fig. 1 and 6, the inner diameter of the first through hole 131 is between 2mm and 15 mm. Above-mentioned structure can increase cooling medium's circulation, promotes the cooling rate of rolling up the core. In the present embodiment, the inner diameter of the first through hole 131 may be 3mm, 8mm, 10mm, or 14 mm. Preferably, the first through hole has an inner diameter of 10 mm. The outer diameter of the insulating tube 130 is between 3mm and 18 mm. The inner diameters of the first connection terminal 50 and the second connection terminal 60 are between 3mm and 18 mm.

If the insulating tubes 130 of the plurality of winding cores are directly connected to each other, the cooling medium flows through the inside, and the cooling medium is likely to leak from the joints of the insulating tubes 130. For solving the above problem, wear to establish cooling tube 160 in insulating tube 130 when connecting into battery module with electric core, flow through cooling medium in cooling tube 160, cooling tube 160 cools down insulating tube 130, and the insulating tube cools down to rolling up the core again. Since the cooling tube 160 is usually made of metal and needs to penetrate out of the insulating tube 130, the distances between the cooling tube 160 and the upper surface of the first connection terminal 50 and the lower surface of the second connection terminal are short, which causes the phenomenon that the cooling tube 160 is electrically connected to the first connection terminal 50 and the second connection terminal 60, resulting in short circuit of the winding core. To solve the above problem, as shown in fig. 2 and 3, in the present embodiment, a first groove 521 (shown in fig. 2) is provided between the upper surface of the first connection terminal 50 and the surface close to the insulating tube 130, the width of the first groove 521 is between 1mm and 5mm, and the depth of the first groove 521 is between 2mm and 10 mm; a second groove 621 (shown in fig. 3) is disposed between the upper surface of the second connection terminal 60 and the surface close to the insulation tube 130, the width of the second groove 621 is between 1mm and 5mm, and the depth of the second groove 621 is between 2mm and 10 mm. In the above structure, providing the first recess 521 on the first connection terminal 50 can increase the minimum distance between the first connection terminal 50 and the cooling pipe 160, thereby reducing the probability of the cooling pipe 160 being electrically connected to the first connection terminal 50. Accordingly, providing the second recess 621 on the second connection terminal 60 can also reduce the probability of the cooling pipe 160 being electrically connected to the second connection terminal 60.

In the present embodiment, the depth of the first groove 521 may be 1mm, 4mm, 5mm, or 10 mm. Preferably, the depth of the first groove 521 is 4 mm. The width of the first groove 521 may be 1mm, 5mm, 3mm, or 10 mm.

Preferably, the depth of the first groove 521 is 3 mm. The depth and width of the second groove 621 are the same as those of the first groove 521.

It should be noted that the first recess 521 may also be filled with an insulating material, and the insulating material may fill the entire first recess 521 and extend outward by 5mm to 15 mm. Correspondingly, the second groove 621 may be filled with an insulating material, and the insulating material may fill the entire second groove 621 and extend outward for 5mm to 15 mm.

As shown in fig. 2, in the present embodiment, the first recess 521 is a first tapered groove gradually narrowing from top to bottom. As shown in fig. 3, the second recess 621 is a second tapered recess gradually expanding from top to bottom. The above structure facilitates the processing of the first recess 521 and the second recess 621.

As shown in fig. 1, in the present embodiment, the first connection terminal 50 includes a first connection section 51 and a second connection section 52 located above the first connection section 51, an outer diameter of the first connection section 51 is smaller than an outer diameter of the second connection section 52, and a first step surface 53 is formed between the first connection section 51 and the second connection section 52; the second connection terminal 60 includes a third connection section 61 and a fourth connection section 62 located below the third connection section 61, the third connection section 61 has an outer diameter smaller than that of the fourth connection section 62, and a second step surface 63 is formed between the third connection section 61 and the fourth connection section 62. The above structure allows the second connection section 52 to have a width and a depth large enough to provide the first recess 521. Accordingly, the above structure allows the fourth connecting section 62 to have a width and depth large enough to provide the second recess 621.

Of course, in other embodiments, the width of the second connection segment 52 may be increased to be the same as the inner diameter of the side wall of the cell casing, so that the second connection segment 52 directly forms the upper end plate of the cell. The first connection terminal 50 is directly hermetically connected to the housing. Correspondingly, the fourth connecting section 62 can also directly form a lower end plate which is connected to the side wall of the cell housing.

As shown in fig. 2, in the present embodiment, the outer diameter of the second connecting section 52 is between 8mm and 90mm, and the outer diameter of the first connecting section 51 is between 4mm and 25 mm; the fourth connecting section 62 has an outer diameter of between 8mm and 90mm and the third connecting section 61 has an outer diameter of between 4mm and 22 mm.

As shown in fig. 5, in other embodiments, the first connection terminal 50 includes a first connection section 51 and a second connection section 52 located above the first connection section 51, the second connection section 52 is a straight cylinder section, the first connection section 51 is a conical cylinder section, and an outer surface of the first connection section 51 gradually shrinks inward in a direction from top to bottom; the second connection terminal 60 includes a third connection section 61 and a fourth connection section 62 located below the third connection section 61, the fourth connection section 62 is a straight cylindrical section, the third connection section 61 is a tapered cylindrical section, and an outer surface of the third connection section 61 gradually expands outward in a top-to-bottom direction. In the above structure, the outer conical surface of the conical section of the first connection terminal 50 has a larger area than that of the straight structure, so that the first connection terminal 50 has a larger connection area when being connected to the tab. Accordingly, the second connection terminal 60 also has a larger connection area.

As shown in fig. 5, in the present embodiment, the outer diameter of the second connecting section 52 is between 8mm and 90mm, and the outer diameter of the first connecting section 51 is between 4mm and 90 mm; the fourth connecting section 62 has an outer diameter of between 8mm and 90mm and the third connecting section 61 has an outer diameter of between 4mm and 90 mm.

Of course, in other embodiments, the first connection terminal may be configured as a straight cylinder, and the thickness of the first connection terminal is ensured to be between 1mm and 15mm, so as to facilitate the first groove on the first connection terminal. Accordingly, the second connection terminal 60 is also provided in a straight cylindrical structure, and the thickness of the second connection terminal 60 is secured between 1mm and 15 mm.

As shown in fig. 7, the present application also provides a battery cell, and an embodiment of the battery cell 120 of the present application includes a casing 100 and a winding core 110. The core 110 has the advantages of simple production process, high yield and good heat dissipation effect, and thus the battery cell 120 with the core also has the advantages.

As shown in fig. 8, the present application also provides a battery module, an embodiment of the battery module of the present application includes: a plurality of battery cells 120, the battery cells 120 are the above battery cells, and the battery cells 120 are electrically connected. Because electric core 120 has the advantage that production technology is simple, the yield is high and the radiating effect is good, consequently the battery module that has it also possesses above-mentioned advantage.

The traditional mode of cooling for electric core 120 is to place in the shell of battery module after integrateing into the module with electric core 120, plays the cooling effect through the water-cooling chamber of shell. Above-mentioned structure adopts is that outside conduction dispels the heat, and can not cover all points that generate heat of rolling up the core, and the radiating efficiency is low. In order to solve the above problem, the present application designs a battery cell 120 with an insulating tube 130, as shown in fig. 7, a positive electrode sheet 20, a separator 40, and a negative electrode sheet 30 are wound around the outer circumferential side of the insulating tube 130, and a cooling medium can flow through the insulating tube 130. In order to connect the plurality of insulating tubes 130, in this embodiment, the battery module further includes an insulating joint, the insulating joint can connect the insulating tubes 130 of the winding cores 110 of the two battery cells 120, the insulating joint is hermetically connected to the insulating tubes 130, and a cooling medium flows through the insulating tubes 130. Can establish ties the insulating tube 130 among a plurality of electric cores 120 in above-mentioned structure for in cooling medium can the circulation enter into every electric core 120, thereby make every electric core 120 can both be cooled down, promote the cooling effect of battery module, greatly improved electric core 120's thermal runaway problem.

If the insulating tubes 130 of the plurality of winding cores are directly connected to each other, the cooling medium flows through the inside, and the cooling medium is likely to leak from the joints of the insulating tubes 130. In order to solve the above problem, as shown in fig. 8, in this embodiment, the battery module further includes a cooling pipe 160, the cooling pipe 160 is inserted into the insulating pipe 130 of the winding core 110 of the plurality of battery cells, and a cooling medium flows through the cooling pipe 160. In the structure, the cooling pipe 160 penetrates through the plurality of winding cores 110, and the insulating pipe is prevented from being connected through the insulating joint, so that the phenomenon of liquid leakage between the insulating pipe and the insulating joint is avoided, and the safety of the battery core is improved. Flow through coolant in cooling tube 160, cooling tube 160 can cool down insulating tube 130, and the insulating tube cools down to rolling up the core again to play better cooling effect to electric core.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … … surface," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (12)

1. A winding core, comprising:

the positive plate (20), the negative plate (30) and a diaphragm (40), wherein the diaphragm (40) separates the adjacent positive plate (20) and negative plate (30);

an insulating tube (130) having a first through hole (131), wherein the positive electrode sheet (20), the separator (40), and the negative electrode sheet (30) are wound around the outer circumferential side of the insulating tube (130);

the first connecting terminal (50) is sleeved at the upper end part of the insulating tube (130), and the positive plate (20) is electrically connected with the first connecting terminal (50);

and the second connecting terminal (60) is sleeved at the lower end part of the insulating tube (130), and the negative pole piece (30) is electrically connected with the second connecting terminal (60).

2. The winding core of claim 1,

the positive plate (20) comprises a positive plate body (22) and a positive tab (21) arranged on the positive plate body (22), the height of the positive tab (21) is gradually increased from the innermost layer to the outermost layer, and the upper end of the positive tab (21) is electrically connected to the side wall of the first connecting terminal (50);

negative pole piece (30) include negative pole piece body (32) and set up in negative pole utmost point ear (31) on negative pole piece body (32), the height of negative pole utmost point ear (31) is by inlayer to outmost gradual increase, the lower extreme electric connection of negative pole utmost point ear (31) in on the lateral wall of second connecting terminal (60).

3. The winding core of claim 1,

a first groove (521) is formed between the upper surface of the first connecting terminal (50) and the surface close to the insulating tube (130), the width of the first groove (521) is 1 mm-5 mm, and the depth of the first groove (521) is 2 mm-10 mm;

a second groove (621) is arranged between the upper surface of the second connecting terminal (60) and the surface close to the insulating tube (130), the width of the second groove (621) is between 1mm and 5mm, and the depth of the second groove (621) is between 2mm and 10 mm.

4. The winding core of claim 3,

the first groove (521) is a first conical groove which gradually shrinks from top to bottom;

the second groove (621) is a second tapered groove gradually expanding from top to bottom.

5. The winding core according to any one of claims 1 to 4,

the first connecting terminal (50) comprises a first connecting section (51) and a second connecting section (52) located above the first connecting section (51), the outer diameter of the first connecting section (51) is smaller than that of the second connecting section (52), and a first step surface (53) is formed between the first connecting section (51) and the second connecting section (52);

the second connecting terminal (60) comprises a third connecting section (61) and a fourth connecting section (62) located below the third connecting section (61), the outer diameter of the third connecting section (61) is smaller than that of the fourth connecting section (62), and a second step surface (63) is formed between the third connecting section (61) and the fourth connecting section (62).

6. The winding core of claim 5,

the outer diameter of the second connecting section (52) is between 8mm and 90mm, and the outer diameter of the first connecting section (51) is between 4mm and 25 mm;

the outer diameter of the fourth connecting section (62) is between 8mm and 90mm, and the outer diameter of the third connecting section (61) is between 4mm and 25 mm.

7. The winding core according to any one of claims 1 to 4,

the first connecting terminal (50) comprises a first connecting section (51) and a second connecting section (52) located above the first connecting section (51), the second connecting section (52) is a straight cylinder section, the first connecting section (51) is a conical cylinder section, and the outer surface of the first connecting section (51) gradually shrinks inwards in the direction from top to bottom;

the second connecting terminal (60) comprises a third connecting section (61) and a fourth connecting section (62) located below the third connecting section (61), the fourth connecting section (62) is a straight cylinder section, the third connecting section (61) is a conical cylinder section, and the outer surface of the third connecting section (61) gradually expands outwards in the direction from top to bottom.

8. The winding core of claim 7,

the outer diameter of the second connecting section (52) is between 8mm and 90mm, and the outer diameter of the first connecting section (51) is between 4mm and 90 mm;

the outer diameter of the fourth connecting section (62) is between 8mm and 90mm, and the outer diameter of the third connecting section (61) is between 4mm and 90 mm.

9. The winding core according to any one of claims 1 to 4,

the first connecting terminal (50) is of a straight-tube structure, and the thickness of the first connecting terminal (50) is between 1mm and 15 mm;

the second connecting terminal (60) is of a straight-tube structure, and the thickness of the second connecting terminal (60) ranges from 1mm to 15 mm.

10. A cell, comprising:

a housing (100);

a winding core (110) disposed within the housing, wherein the winding core (110) is the winding core (110) of any of claims 1-9.

11. A battery module, comprising:

a plurality of cells (120), wherein the cells (120) are according to claim 10, and wherein the plurality of cells (120) are electrically connected.

12. The battery module according to claim 11, further comprising an insulation joint communicating the insulation tubes (130) of the winding cores (110) of the two battery cells (120), the insulation joint being sealingly connected to the insulation tubes (130),

a cooling medium is circulated in the insulating tube (130), or

The battery module further comprises a cooling pipe (160), the cooling pipe (160) penetrates through the insulating pipe (130) of the winding core (110) of the battery core, and a cooling medium flows through the cooling pipe (160).

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