CN220382191U - Pole core and battery - Google Patents

Abstract

The utility model provides a pole core and a battery, wherein the pole core comprises: the pole core body and heating piece, the heating piece is including setting up the inside first part of pole core body with extend to the outside second part of pole core body, first part with the second part links into an integrated entity, the second part keep away from the one end of first part is provided with connecting portion. The utility model provides a pole core and a battery, which are used for solving the problem that a heating element in the pole core is easy to have poor electrical contact and improving the use stability of the heating element.

Description

Pole core and battery

Technical Field

The present disclosure relates to batteries, and particularly to a battery and a battery.

Background

A battery is widely used as an energy storage device in various fields such as consumer electronics, electric vehicles, energy storage power stations, etc., however, in the use process of the battery, various safety problems are easily induced due to thermal runaway, for example, serious consequences such as explosion and ignition of the battery are caused, which restricts the development of the battery.

In the related art, heating the lithium battery is a common means for actively triggering the thermal runaway of the lithium battery, usually, by heating the lithium battery outside the battery, the thermal runaway triggering position is limited, and the use requirement is difficult to meet, so that a heating mode in the pole core is generated, a heating element is required to be arranged in the pole core, but the heating element in the pole core is easy to have the problem of poor electrical contact, once a lead connected with the heating element is loosened, the repair cannot be performed, and the use stability of the heating element is affected.

Disclosure of Invention

The utility model provides a pole core and a battery, which are used for solving the problem that a heating element in the pole core is easy to have poor electrical contact and improving the use stability of the heating element.

In order to achieve the above object, the present utility model provides a pole core comprising: the pole core body and heating piece, the heating piece is including setting up the inside first part of pole core body with extend to the outside second part of pole core body, first part with the second part links into an integrated entity, the second part keep away from the one end of first part is provided with connecting portion.

According to the pole core provided by the utility model, the first part is arranged in the pole core body, and the thermal runaway triggering position is also flexible, so that the connection point between the connecting wire and the heating element is not required to be formed in the pole core because part of the heating element extends to the outside of the pole core body, the use stability of the heating element can be effectively improved, the problem that the heating element in the pole core is easy to generate poor electrical contact is solved, and the service life of the battery is ensured not to be influenced. The thickness of the connecting position of the heating element and the connecting wire is not too large, thereby avoiding the phenomenon of difficult assembly and production.

In one possible implementation, the first portion includes a first insulating layer, a heating layer, and a second insulating layer disposed in sequence, the first insulating layer and the second insulating layer being connected to each other such that the heating layer is sealed between the first insulating layer and the second insulating layer.

In one possible implementation, the second portion includes a third insulating layer, an extraction layer, and a fourth insulating layer disposed in this order, the third insulating layer and the fourth insulating layer being connected to each other such that the extraction layer is sealed between the third insulating layer and the fourth insulating layer.

In one possible implementation, the connection part is a connection hole;

the connecting hole penetrates through the extraction layer, the third insulating layer and the fourth insulating layer; or alternatively, the first and second heat exchangers may be,

the connecting hole penetrates through the third insulating layer or the fourth insulating layer, and part of the extraction layer is exposed through the connecting hole.

In one possible embodiment, the first insulating layer and the third insulating layer are connected to each other; and/or the number of the groups of groups,

the second insulating layer and the fourth insulating layer are connected to each other; and/or the number of the groups of groups,

the heating layer and the extraction layer are connected into a whole.

In one possible implementation, the thickness of the heating layer is 0.05mm to 0.2mm and the thickness of the first portion is 0.11mm to 1mm.

In one possible implementation, the heating layer and the extraction layer each comprise heating wires; the width of the heating wire forming the lead-out layer is greater than the width of the heating wire forming the heating layer.

In one possible embodiment, the resistance of the heating layer is 2 Ω to 100 Ω.

In one possible implementation, the extraction layer includes at least one of a straight segment and a bent segment.

The utility model also provides a battery, which comprises a shell and the pole core, wherein the pole core is arranged in the shell, the shell is provided with a leading-out hole, the pole core comprises a heating piece, and the second part of the heating piece extends to the outside of the battery through the leading-out hole.

According to the pole core and the battery, the size of the pole core cannot be changed, when the thermal runaway experiment is arranged, the heating element can be placed at any position in the pole core body, the thermal runaway of the pole core is triggered accurately and effectively, software does not need to be adapted independently, and the situation in the practical use process is more closed.

According to the pole core and the battery, part of the heating element is led out of the battery, so that welding, no power line and the like are not arranged in the pole core body, the use stability of the heating element is improved, and the service life of the battery is ensured.

In addition to the technical problems, technical features constituting the technical solutions, and beneficial effects caused by the technical features of the technical solutions described above, other technical problems that can be solved by the pole core and the battery provided by the embodiments of the present utility model, other technical features included in the technical solutions, and beneficial effects caused by the technical features of the embodiments of the present utility model will be described in further detail in the detailed description.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a battery according to an embodiment of the present utility model;

fig. 2 is a schematic structural diagram of a heating element of a pole core according to an embodiment of the present utility model;

FIG. 3 is an exploded view of a heating element of a pole piece according to an embodiment of the present utility model;

FIG. 4 is a schematic view of a battery according to an embodiment of the present utility model;

FIG. 5 is a schematic view of a heating element with a pole core according to an embodiment of the present utility model;

fig. 6 is a schematic structural diagram of a battery according to an embodiment of the present utility model at a first viewing angle;

fig. 7 is a schematic structural diagram of a battery according to an embodiment of the present utility model at a second viewing angle.

Reference numerals illustrate:

10-pole core body;

20-heating element;

21-a first part;

211-a heating layer;

212-a first insulating layer;

213-a second insulating layer;

22-a second part;

221-an extraction layer;

222-a third insulating layer;

223-fourth insulating layer;

23-connecting part;

30-a housing;

31-leading out holes;

40-explosion-proof valve;

50-pole.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In order to realize the thermal runaway triggering of the battery, a heating plate can be arranged outside the battery, so that the defects that the heating time is long and extra heat is brought to the battery exist, research and analysis are influenced, the original structure of the battery can be damaged by adding the heating plate, and the triggering position is limited. In addition, the heating piece is arranged in the pole core, and the pole core is heated through the heating of the heating piece, so that the heating time can be shortened, and the thermal runaway triggering position is flexible.

However, since the heating element is located inside the pole core, how to energize the heating element makes the heating element generate heat becomes critical, the lead wire connected with the heating element is easy to fall off, and the falling position is usually inside the pole core, so that the battery cannot be used.

In view of this, according to the pole core provided by the utility model, the heating element is arranged in the pole core body, and a part of the heating element extends to the outside of the pole core body, so that the position of the connecting wire of the heating element is positioned outside the battery, and therefore, the connection point of the connecting wire and the heating element is not required to be formed in the pole core, the phenomenon that the position of the heating element connected in the pole core is easily loosened is prevented, and the problem that the heating element in the pole core is easy to have poor electrical contact is solved, so that the use stability of the heating element is improved.

The following describes a pole core and a battery provided by an embodiment of the present utility model with reference to the accompanying drawings.

Referring to fig. 1 and 2, the present utility model provides a pole core comprising: the pole core body 10 and the heating element 20, the heating element 20 includes a first portion 21 disposed inside the pole core body 10 and a second portion 22 extending to the outside of the pole core body 10, the first portion 21 and the second portion 22 are connected into a whole, and one end of the second portion 22 away from the first portion 21 is provided with a connecting portion 23.

According to the pole core provided by the utility model, the first part 21 is arranged in the pole core body 10, so that the thermal runaway triggering position is flexible, and as part of the heating element 20 extends to the outside of the pole core body 10, the connection point between the connecting wire and the heating element 20 is not required to be formed in the pole core, the use stability of the heating element 20 can be effectively improved, the problem that the heating element 20 in the pole core is easy to generate poor electrical contact is solved, and the service life of a battery is ensured not to be influenced.

In one possible implementation, the pole core body 10 includes a plurality of pole pieces stacked, and two adjacent pole pieces are separated by a diaphragm, where the diaphragm is used to prevent the adjacent two pole pieces from contacting to cause a pole piece short circuit, and the first portion 21 may be a position disposed between the two pole pieces, so that the first portion 21 is beneficial to heat the pole pieces, so that the diaphragm is melted, and the pole pieces are caused to short circuit, thereby achieving the purpose of triggering thermal runaway.

In one possible embodiment, the first portion 21 may be located at a middle position in the thickness direction of the pole core body 10, or may be located at an edge position, which is not particularly limited herein.

In one possible implementation, referring to fig. 2 and 3, the first portion 21 includes a first insulating layer 212, a heating layer 211, and a second insulating layer 213 sequentially disposed, and the first insulating layer 212 and the second insulating layer 213 are connected to each other such that the heating layer 211 is sealed between the first insulating layer 212 and the second insulating layer 213, functioning to protect the heating layer 211.

In one possible implementation, the first insulating layer 212 and the second insulating layer 213 may be sealed by hot pressing or the like to seal the heating layer 211.

In one possible implementation, the second portion 22 includes a third insulating layer 222, an extraction layer 221, and a fourth insulating layer 223 disposed in this order, and the third insulating layer 222 and the fourth insulating layer 223 are connected to each other such that the extraction layer 221 is sealed between the third insulating layer 222 and the fourth insulating layer 223, functioning to protect the extraction layer 221.

In one possible implementation, the third insulating layer 222 and the fourth insulating layer 223 may be sealed by hot pressing or the like.

In one possible implementation, the heating layer 211 may be rectangular, for example, the heating layer 211 may be rectangular with a length×width of 30mm×30mm, and a resistance value of 5Ω. The third insulating layer 222 and the fourth insulating layer 223 may have rectangular shapes, and the third insulating layer 222 and the fourth insulating layer 223 may cover both sides of the heating layer 211 and encapsulate the heating layer 211 to achieve sealing.

In one possible implementation, referring to fig. 3 and 4, the connection portion 23 is a connection hole penetrating the extraction layer 221, the third insulating layer 222, and the fourth insulating layer 223.

In one possible implementation, the connection portion 23 is a connection hole penetrating through the third insulating layer 222 or the fourth insulating layer 223, and a portion of the extraction layer 221 is exposed through the connection hole.

The shape of the connection hole may be circular, square, oval, etc., and the purpose of the connection hole is to facilitate the connection between the second portion 22 and the wire by welding, for example, the connection hole may be a connection hole formed by connecting the wire to the second portion 22 by soldering, laser welding, etc., so as to achieve electrical conduction. The number of the connecting holes is two, and the two connecting holes correspond to the positive electrode and the negative electrode respectively.

In one possible implementation, the first insulating layer 212 and the third insulating layer 222 are connected to each other. The first insulating layer 212 and the third insulating layer 222 may be a unitary structure connected together.

In one possible implementation, the second insulating layer 213 and the fourth insulating layer 223 are connected to each other. The second insulating layer 213 and the fourth insulating layer 223 may be a unitary structure connected as one body.

In one possible implementation, the extraction layer 221 is interconnected with the heating layer 211. The extraction layer 221 and the heating layer 211 may be integrally connected.

In one possible implementation, the thickness of the heating layer 211 is 0.05mm to 0.2mm, and an excessive thickness of the heating layer 211 may cause an increase in the thickness of the pole core body 10, which is not beneficial to the production and manufacture of the pole core, and an excessively small thickness of the heating layer 211 is not beneficial to the improvement of the strength of the heating layer 211. For example, the thickness of the heating layer 211 may be 0.05mm, 0.1mm, 0.15mm, or 0.2mm. So that the thickness of the core body 10 is not increased too much and the strength of the heating layer 211 is ensured.

In one possible embodiment, the thickness of the first portion 21 is 0.11mm to 1mm, and the thickness of the pole core body 10 may be prevented from being excessively thick, for example, the thickness of the first portion 21 may be 0.11mm, 0.2mm, 0.3mm, 0.5mm, 0.7mm, or 1mm.

In one possible implementation, the thickness of the extraction layer 221 is consistent with the thickness of the heating layer 211, and the thickness of the second portion 22 is consistent with the thickness of the first portion 21. The first portion 21 is conveniently provided inside the pole core body 10, preventing an excessive increase in the thickness of the pole core.

In one possible implementation, the first insulating layer 212 and the third insulating layer 222 are polyimide film layers. The third insulating layer 222 and the fourth insulating layer 223 are polyimide film layers, and the polyimide film has excellent thermal stability, chemical resistance and insulating properties, thereby protecting the heating layer 211 and the lead-out layer 221 from being contacted with the electrolyte and from being corroded by the electrolyte.

In one possible embodiment, the heating layer 211 and the lead-out layer 221 are integrally connected, and the thickness of the connection position of the heating layer 211 and the lead-out layer 221 can be prevented from being increased relative to the connection by spot welding.

In one possible implementation, referring to fig. 3 and 5, the heating layer 211 and the drawing layer 221 each include a heating wire. The shape of the heating wire can be flexibly processed according to the use requirement. For example, the heating wire may be manufactured by an etching process, a metal sheet is coated with a protective film to protect the non-corroded portion, and the non-covered or protected portion is removed by chemical reaction or physical action, and the remaining non-corroded portion forms the heating wire. The corners of the heating wires can be arranged into a continuous semicircle to ensure the stable etching process, eliminate stress concentration points and ensure more uniform transition of the temperature field.

In other possible embodiments, the heating layer 211 may be formed by winding a heating wire, and the shape of the winding of the heating wire is not particularly limited herein, so that heating can be achieved, and both ends of the heating wire extend to form the lead-out layer 221.

In one possible embodiment, the resistance of the heating layer 211 is 2 Ω to 100 Ω in order to increase the heat generation efficiency. Illustratively, the resistance value of the heating layer 211 may be 2Ω, 5Ω, 10Ω, 20Ω, 50Ω, 80Ω, or 100deg.OMEGA, ensuring heat generating efficiency. Of course, in other possible embodiments, the resistance of the heating layer 211 may be 1Ω, 120Ω, or the like.

In one possible embodiment, the heating layer 211 and the extraction layer 221 are processed by using the same material, for example, copper, stainless steel, or other similar materials may be used, or a larger heating power may be provided to heat the pole core body 10 when the current is supplied, or other processing techniques may be used.

In one possible implementation, the extraction layer 221 includes at least one of a straight segment and a bent segment. This is to better match the position of the heating element 20 within the pole piece body 10, and the bending section can avoid interference well.

In one possible implementation, the extraction layer 221 may include one straight line segment and one bent segment connected to each other, and the extraction layer 221 may further include two straight line segments and a bent segment connected between the two straight line segments, where the bent segment may be in a circular arc shape or a right angle shape.

In one possible implementation, the extraction layer 221 may further include two straight line segments connected to each other, that is, a first straight line segment and a second straight line segment, where the first straight line segment is connected to the heating layer 211, the first straight line segment may be rectangular with a length×width of 28mm×10mm, the first straight line segment is connected to the first straight line segment, the second straight line segment may be rectangular with a length×width of 60mm×10mm, and one end of the second straight line segment in the length direction extends to the outside of the pole core body 10. Wherein the length direction of the first straight line segment refers to the direction indicated by the arrow X in fig. 2, and the length direction of the second straight line segment refers to the direction indicated by the arrow Y in fig. 2.

In one possible implementation, the width of the heating wire forming the lead-out layer 221 is greater than the width of the heating wire forming the heating layer 211. With this structure, the resistance per unit length of the extraction layer 221 can be reduced, and the amount of heat generated by the extraction layer 221 can be reduced.

Referring to fig. 1, in the process of producing the pole core, the heating element 20 is placed in the pole core body 10 in advance, the heating element 20 does not contain a positive and negative power line, but directly leads out the second portion 22 to the outside of the pole core body 10 in a film-shaped lead-out manner, so that the contact points of the whole heating element 20 in the pole core body 10 are as few as possible, the thickness is as thin as possible, and the possibility of being corroded by electrolyte is reduced.

In one possible implementation, the second portion 22 may be 1.2mm wide and 0.3mm thick.

Referring to fig. 4 and 6, the present utility model further provides a battery including a case 30 and the above-mentioned electrode core, the electrode core being disposed in the case 30, the case 30 being provided with a lead-out hole 31, and the second portion 22 extending to the outside of the battery through the lead-out hole 31.

In one possible implementation, the casing 30 includes a bottom shell and a cover plate, where the cover plate covers the opening end of the bottom shell, seals the pole core in the casing 30, and the lead-out hole 31 may be formed on the bottom shell or on the cover plate, which is not limited herein specifically.

Referring to fig. 6 and 7, the lead-out hole 31 is a through hole, is an elongated hole, and has a length of 1.2mm and a width of 0.5mm. The position of the extraction hole 31 should be selected so as not to interfere with the pole 50, the explosion-proof valve 40, etc. on the housing 30 and so as to be away from the liquid injection hole formed on the housing 30.

Referring to fig. 4 and 6, after the second portion 22 extends to the outside of the battery through the lead-out hole 31, the lead-out hole 31 is sealed by a gel to perform a sealing function, so that the lead-out hole 31 is prevented from being corroded by the electrolyte splashed out when the electrolyte is injected into the casing 30 through the electrolyte injection hole. For example, the sealing can be performed by adopting a glue-coated raw material belt, rolling the raw material belt into fine wires, firstly plugging the fine wires into the positions of the holes by using a fine plastic needle, then gluing the fine wires, ensuring that the glue is uniformly glued and the glue-coated positions are sealed by glue without bubbles, and checking whether glue supplementing is needed after standing for 24 hours. In addition, the second part 22 extending to the outside of the pole core body 10 is protected by the Teflon adhesive tape after the glue is coated, the normal flow is realized, and the other procedures are normal

When a voltage is applied to the heating element 20 by using a power supply, the heating element 20 heats the pole core body 10, and the pole core is short-circuited when the temperature of the diaphragm is reached, so that the thermal runaway of the pole core can be triggered.

In one possible implementation, the outer surface of the housing 30 is provided with an explosion proof valve 40. The second portion 22 may extend toward a side of the explosion proof valve 40 or may extend away from a side of the explosion proof valve 40.

The size of the battery provided by the utility model is the same as that of the battery without the heating element 20, the battery can be placed at any position in a battery system when the thermal runaway experiment is arranged, when the heating element 20 is electrified, the heating element 20 intensively heats the trigger electrode core body 10, the thermal runaway trigger of the electrode core is accurate and effective, special software is not required to be independently adapted, and the battery is more close to the situation in the actual use process.

According to the pole core provided by the utility model, part of the heating element 20 is led out of the battery, so that no welding, no power line and the like are arranged in the pole core body 10, the use stability of the heating element 20 is improved, and the service life of the battery is ensured.

It should be noted that, the numerical values and numerical ranges referred to in the present application are approximate values, and may have a certain range of errors under the influence of the manufacturing process, and those errors may be considered to be negligible by those skilled in the art.

In the description of the present utility model, it should be understood that the terms "center", "length", "width", "thickness", "top", "bottom", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", "axial", "circumferential", etc. are used to indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present utility model and to simplify the description, and do not indicate or imply that the referred location or element must have a specific orientation, in a specific configuration and operation, and therefore should not be construed as limiting the present utility model.

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

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

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims (10)

1. A pole piece, comprising: the pole core body (10) and heating piece (20), heating piece (20) are including setting up pole core body (10) inside first part (21) and extend to pole core body (10) outside second part (22), first part (21) with second part (22) connect into an organic wholely, second part (22) keep away from first part (21) one end is provided with connecting portion (23).

2. The pole core according to claim 1, characterized in that the first part (21) comprises a first insulating layer (212), a heating layer (211), and a second insulating layer (213) arranged in sequence, the first insulating layer (212) and the second insulating layer (213) being connected to each other such that the heating layer (211) is sealed between the first insulating layer (212) and the second insulating layer (213).

3. The pole core according to claim 2, characterized in that the second part (22) comprises a third insulating layer (222), an extraction layer (221) and a fourth insulating layer (223) arranged in sequence, the third insulating layer (222) and the fourth insulating layer (223) being connected to each other such that the extraction layer (221) is sealed between the third insulating layer (222) and the fourth insulating layer (223).

4. -pole piece according to claim 3, characterized in that the connection (23) is a connection hole;

the connection hole penetrates through the extraction layer (221), the third insulating layer (222) and the fourth insulating layer (223); or alternatively, the first and second heat exchangers may be,

the connection hole penetrates through the third insulating layer (222) or the fourth insulating layer (223), and a part of the extraction layer (221) is exposed through the connection hole.

5. -the pole core according to claim 3, characterized in that the first insulating layer (212) and the third insulating layer (222) are connected to each other; and/or the number of the groups of groups,

-the second insulating layer (213) and the fourth insulating layer (223) are connected to each other; and/or the number of the groups of groups,

the heating layer (211) and the extraction layer (221) are integrally connected.

6. A pole piece according to any of claims 3-5, characterized in that the thickness of the heating layer (211) is 0.05-0.2 mm and the thickness of the first part (21) is 0.11-1 mm.

7. -pole piece according to any of the claims 3 to 5, characterized in that the heating layer (211) and the extraction layer (221) each comprise a heating wire;

the width of the heating wire forming the lead-out layer (221) is greater than the width of the heating wire forming the heating layer (211).

8. Pole piece according to any of claims 2-5, characterized in that the resistance of the heating layer (211) is 2 Ω -100 Ω.

9. The pole core according to any of the claims 3-5, characterized in that the extraction layer (221) comprises at least one of a straight segment and a bent segment.

10. A battery characterized by comprising a housing (30) and a pole piece according to any of claims 1-9, said pole piece being arranged in said housing (30), said housing (30) being provided with an exit hole (31), said pole piece comprising a heating element (20), a second portion (22) of said heating element (20) extending outside said battery through said exit hole (31).