CN220272707U - Battery and battery pack - Google Patents

Abstract

The utility model relates to the technical field of batteries, and provides a battery and a battery pack. The battery includes: a battery housing having an opening; the battery cell is arranged in the battery shell and comprises a battery cell main body and a pole ear part; the cover plate assembly is buckled with the opening; the cover plate assembly comprises a cover plate body and a pole, and the pole is exposed on the surface of one side of the cover plate body, which faces the battery cell; the pole lug part is connected with the pole column to form an internal conductive structure which is positioned inside the battery shell; an insulating film disposed in the battery case; the internal conductive structure passes through the insulating film from the through hole, and at least part of the insulating film covers the tab portion to separate the tab portion from the battery case. This battery can promote insulating properties between tab portion and the battery casing, avoid taking place the short circuit through optimizing self structure to improve the security performance of battery, promote the inside space utilization and the energy density of battery, and, can promote the assembly efficiency of battery, reduce manufacturing cost.

Description

Battery and battery pack

Technical Field

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

Background

The battery is provided with a pole which is used for electrically connecting an internal electric core of the battery with an external structure, and particularly, the pole is connected with a pole lug part of the electric core. It is noted that the tab portion of the existing battery cell has a risk of touching the battery case and causing a short circuit. In the prior art, a lower plastic is adopted to isolate the lug part from the battery shell, and specifically, the lower plastic is provided with an extended baffle part which is arranged between the lug part and the battery shell to isolate the lug part from the battery shell. However, the barrier portion occupies a large space inside the battery case, which reduces the space utilization in the battery; moreover, due to the existence of the baffle part, interference can occur when the lug part extends and is welded with the pole, and the assembly is not facilitated.

Therefore, "how to protect the tab portion, prevent the tab portion from touching the battery case and shorting, and how to improve the assembly efficiency" is a technical problem to be solved.

Disclosure of Invention

The utility model provides a battery and a battery pack, wherein the battery can improve the insulation performance between a pole lug part and a battery shell and avoid short circuit, so as to improve the safety performance of the battery, improve the space utilization rate and the energy density in the battery, improve the assembly efficiency of the battery and reduce the preparation cost by optimizing the structure of the battery.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

according to a first aspect of the present utility model, there is provided a battery comprising:

a battery housing having an opening;

the battery cell is arranged in the battery shell and comprises a battery cell main body and a pole ear part, and the pole ear part is led out from the battery cell main body;

the cover plate assembly is buckled with the opening; the cover plate assembly comprises a cover plate body and a pole, wherein the pole is arranged on the cover plate body and is exposed on the surface of one side of the cover plate body, which faces the battery cell; the tab portion connects the pole to an internal conductive structure located inside the battery housing with the pole;

an insulating film disposed within the battery case; the insulating film is provided with a through hole, the internal conductive structure penetrates through the insulating film from the through hole, and at least part of the insulating film covers the tab portion so as to separate the tab portion from the battery case.

When the battery provided by the application is assembled, the through hole alignment pole of the insulating film can be exposed on one side surface of the cover plate body, which faces the battery core, so that the inner conductive structure formed after the pole is connected with the pole lug part penetrates through the insulating film from the through hole. In the process of connecting the lug part and the pole, the insulating film can be in an unfolding state so as to avoid the welding equipment, so that the welding equipment has sufficient operation space, the assembly difficulty is reduced, the assembly efficiency of the battery is improved, and the preparation cost is further reduced. After that, the insulating film may be bent such that at least a portion of the insulating film is interposed between the tab portion and the battery case, effectively separating the tab portion from the battery case.

It should be noted that, the battery that this application provided sets up the insulating film and covers the utmost point ear of electric core to keep apart utmost point ear and battery housing inner wall through the insulating film, reduce utmost point ear and battery housing inner wall contact, take place the risk of short circuit, and then can improve the security performance of battery, in order to promote the preparation yield of battery and prolong the life of battery. Meanwhile, the lug part and the battery shell are separated by the insulating film in the battery, and the insulating film occupies less space in the battery, so that the space utilization rate in the battery shell is improved, and the energy density of the battery is improved.

According to a second aspect of the present utility model there is provided a battery pack comprising a battery as provided in any of the above first aspects.

When assembling the battery in the group battery that this application provided, can expose the through-hole counterpoint utmost point post of insulating film to the apron body one side surface towards electric core to the inside conductive structure that forms after utmost point post and utmost point ear are connected passes the insulating film from the through-hole. In the process of connecting the lug part and the pole, the insulating film can be in an unfolding state so as to avoid the welding equipment, so that the welding equipment has sufficient operation space, the assembly difficulty is reduced, the assembly efficiency of the battery is improved, and the preparation cost is further reduced. After that, the insulating film may be bent such that at least a portion of the insulating film is interposed between the tab portion and the battery case, effectively separating the tab portion from the battery case.

It should be noted that, in the group battery that this application provided, the battery sets up the tab portion that the insulating film covered the electric core to keep apart tab portion and battery housing inner wall through the insulating film, reduce tab portion and battery housing inner wall contact, take place the risk of short circuit, and then can improve the security performance of battery, in order to promote the preparation yield of battery and to prolong the life of battery. Meanwhile, the lug part and the battery shell are separated by the insulating film in the battery, and the insulating film occupies less space in the battery, so that the space utilization rate in the battery shell can be improved, and the energy density of the battery can be improved.

Drawings

For a better understanding of the present application, reference may be made to the embodiments illustrated in the following drawings. The components in the drawings are not necessarily to scale and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present application. In addition, the relevant elements or components may have different arrangements as known in the art. Furthermore, in the drawings, like reference numerals designate identical or similar parts throughout the several views. Wherein:

fig. 1 is a schematic perspective view of a battery according to an embodiment of the present disclosure;

FIG. 2 is a schematic view of an expanded configuration of the attachment of the cover assembly of FIG. 1 to the tab portion;

FIG. 3 is a front view of the structure of FIG. 2;

FIG. 4 is a schematic illustration of the structure of FIG. 2 with one side tab portion removed;

FIG. 5 is a schematic illustration of the structure of FIG. 2 with two side tabs removed;

fig. 6 is a cross-sectional view at plane M in fig. 5.

The reference numerals are explained as follows:

100. a battery case; 200. a battery cell; 210. a tab portion; 300. a cover plate assembly; 310. a cover plate body; 320. a pole; 330. lower plastic; 331. a body portion; 3311. an annular boss; 332. a protruding portion; 400. an insulating film; 410. a through hole; A. a connection point; s1, a first opening; s2, a second opening.

Detailed Description

The technical solutions in the exemplary embodiments of the present application will be clearly and completely described below with reference to the drawings in the exemplary embodiments of the present application. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present application, and it is therefore to be understood that various modifications and changes may be made to the example embodiments without departing from the scope of the present application.

In the description of the present application, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance unless explicitly specified or limited otherwise; the term "plurality" refers to two or more than two; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, references to "the/" object or "an" object are likewise intended to mean one of a possible plurality of such objects.

Unless specified or indicated otherwise, the terms "connected," "fixed," and the like are to be construed broadly and are, for example, capable of being fixedly connected, detachably connected, or integrally connected, electrically connected, or signally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the terms in the present application can be understood by those skilled in the art according to the specific circumstances.

Further, in the description of the present application, it should be understood that the terms "upper", "lower", "inner", "outer", and the like, which are described in the exemplary embodiments of the present application, are described with the angles shown in the drawings, and should not be construed as limiting the exemplary embodiments of the present application. It will also be understood that in the context of an element or feature being connected to another element(s) "upper," "lower," or "inner," "outer," it can be directly connected to the other element(s) "upper," "lower," or "inner," "outer," or indirectly connected to the other element(s) "upper," "lower," or "inner," "outer" via intervening elements.

Referring to fig. 1, a three-dimensional structure of a battery provided in an embodiment of the present application is representatively illustrated. The battery includes: battery case 100, battery cell 200, cap plate assembly 300, and insulating film 400. In this exemplary embodiment, the battery proposed in the embodiment of the present application is described by taking a secondary battery as an example. Those skilled in the art will readily appreciate that many modifications, additions, substitutions, deletions, or other changes may be made to the specific embodiments described below in order to adapt the relevant designs of the embodiments of the present application to other types of batteries, and such changes remain within the principles of the batteries presented by the embodiments of the present application.

Referring to fig. 2-6, fig. 2 is a schematic view of an expanded structure of the connection between the cover assembly 300 and the tab 210 in fig. 1; FIG. 3 is a front view of the structure of FIG. 2; FIG. 4 is a schematic view of the structure of FIG. 2 with one side tab 210 removed; FIG. 5 is a schematic illustration of the structure of FIG. 2 with two side tabs 210 removed; fig. 6 is a cross-sectional view at plane M in fig. 5. The structure, connection manner and functional relationship of the main components of the battery according to the embodiment of the present application will be described in detail below with reference to the above-mentioned drawings.

Referring to the structures shown in fig. 1 to 6, a battery provided in an embodiment of the present application includes: the battery pack includes a battery case 100, a battery cell 200, a cap plate assembly 300, and an insulating film 400, wherein the battery case 100 has an opening; the battery cell 200 is arranged in the battery shell 100, the battery cell 200 comprises a battery cell main body and a pole ear part 210, and the pole ear part 210 is led out from the battery cell main body; the cover plate assembly 300 is buckled with the opening; the cover assembly 300 comprises a cover body 310 and a pole 320, the pole 320 is arranged on the cover body 310, and the pole 320 is exposed on one side surface of the cover body 310 facing the battery cell 200; the tab portion 210 is connected to the tab 320 to form an internal conductive structure with the tab 320 inside the battery case 100; the insulating film 400 is disposed in the battery case 100; the insulating film 400 is provided with a through hole 410, the internal conductive structure passes through the insulating film 400 from the through hole 410, and at least part of the insulating film 400 covers the tab portion 210 to separate the tab portion 210 from the battery case 100.

It should be understood that the tab portion 210 of the cell 200 in fig. 1 is covered with the insulating film 400, and thus is not shown in this view; the tab portion 210 in fig. 2 to 6 is drawn from a cell main body within the cell 200, the cell main body is not shown for convenience in showing the positional relationship of the insulating film 400 and the tab portion 210, and the tab portion 210 is shown in a flattened form. It is noted that when the tab 210 of fig. 2 is applied to the structure of fig. 1, the morphology thereof is changed from that of fig. 2, and the folded insulating film 400 is formed in the morphology shown in fig. 1, for example.

In assembling the battery provided in the embodiments of the present application, the through hole 410 of the insulating film 400 may be exposed to the surface of the cover plate body 310 facing the battery cell 200, so that the internal conductive structure formed after the connection of the electrode 320 and the tab portion 210 passes through the insulating film 400 from the through hole 410. In the process of connecting the tab portion 210 and the pole 320, the insulating film 400 can be in an unfolded state so as to avoid the welding equipment, so that the welding equipment has sufficient operation space, the assembly difficulty is reduced, the assembly efficiency of the battery is improved, and the preparation cost is further reduced. Thereafter, the insulating film 400 may be bent such that at least a portion of the insulating film 400 is interposed between the tab portion 210 and the battery case 100, effectively separating the tab portion 210 from the battery case 100.

It should be noted that, the battery provided by the embodiment of the application sets up the tab portion 210 of the insulating film 400 covering the electric core 200 to keep apart the tab portion 210 and the inner wall of the battery housing 100 through the insulating film 400, reduce the risk of the contact of the tab portion 210 and the inner wall of the battery housing 100 and the occurrence of short circuit, and then can improve the safety performance of the battery, so as to improve the preparation yield of the battery and prolong the service life of the battery.

Meanwhile, since the tab portion 210 and the battery case 100 are separated by the insulating film 400 in the battery, the insulating film 400 occupies less space inside the battery, so that the space utilization rate inside the battery case 100 can be improved, and the energy density of the battery can be improved.

With continued reference to the structure shown in fig. 1, the battery case 100 may have one or two openings, and each opening is fastened with a cover assembly 300. When the battery case 100 has two openings, the number of the cap plate assemblies 300 is also 2.

It should be appreciated that tab portion 210 may lead from the same side or different sides of the cell body. Illustratively, as shown in fig. 1, the cell 200 includes two tab portions 210, and the two tab portions 210 are led out from opposite sides of the cell body, each tab portion 210 corresponds to one opening of the battery case 100, and specifically, the two tab portions 210 include a tab portion 210 having a positive polarity and a tab portion 210 having a negative polarity.

It is noted that the cell body may be formed via winding or lamination, whether a wound or laminated cell body, with a separator between the positive and negative electrode sheets. The portions of the positive electrode sheet and the negative electrode sheet having active materials constitute the cell main body, and the portions of the positive electrode sheet and the negative electrode sheet having no active materials constitute the tabs in the cell 200. The tabs of the plurality of positive plates are stacked and folded to form positive tab portions 210, and the tabs of the plurality of negative plates are stacked and folded to form negative tab portions 210. The positive polarity tab 210 of the cell 200 is connected to the post 320 of one cap assembly 300 such that the post 320 forms the positive electrode of the battery, and the negative polarity tab 210 is connected to the post 320 of the other cap assembly 300 such that the post 320 forms the negative electrode of the battery. Of the two cap plate assemblies 300, at least one cap plate assembly 300 may have an insulating film 400 at it.

It will be appreciated that the battery is also internally provided with an electrolyte. The electrolyte consists of electrolyte, organic solvent and additive. The electrolyte is an important material in the battery, can transport lithium ions and provide power required by the battery, and is a key component for the battery to exert energy. During charge and discharge of the battery, the active material of positive polarity and the active material of negative polarity react with the electrolyte.

It is noted that, in the present embodiment, the internal conductive structure refers to a structure for conducting current inside the battery. When the tab portion 210 is directly connected to the pole 320, the internal conductive structure includes the tab portion 210 and the pole 320; when tab portion 210 is connected to pole 320 via an adapter, the internal conductive structure includes tab portion 210, the adapter, and pole 320. Taking the example that the internal conductive structure includes only the pole 320 and the tab portion 210, the insulating film 400 may be sleeved outside the pole 320 or the insulating film 400 may be sleeved outside a portion of the tab portion 210 in cooperation with the arrangement form of the pole 320 and the tab portion 210.

In a specific embodiment, referring to the structure shown in fig. 5 and 6, on the side of the cap assembly 300 facing the battery cell 200, the terminal 320 extends beyond the cap body 310, and the insulating film 400 is sleeved on the outer side of the portion of the terminal 320 extending beyond the cap body 310.

In this embodiment, the insulating film 400 is located at the root of the pole 320, so that the tab portion 210 can be better insulated and protected, and most or all of the tab portion 210 is covered, so as to further improve the safety performance of the battery.

In one embodiment, referring to the structure shown in fig. 2 to 6, the cover assembly 300 in the embodiment of the present application further includes a lower plastic 330, where the lower plastic 330 is located on a side of the cover body 310 facing the battery cell 200; the pole 320 is exposed from the surface of the lower plastic 330 facing the battery cell 200; the insulating film 400 partially overlaps the lower plastic 330 and is connected to the lower plastic 330.

It should be noted that the lower plastic 330 can enhance the assembly effect between the cover body 310 and the battery case 100, so as to effectively seal the assembly interface of the two. Meanwhile, since the lower plastic 330 is similar to the insulating film 400 in material, fixing the insulating film 400 to the lower plastic 330 can reduce the fixing difficulty of the insulating film 400 and improve the fixing effect of the insulating film 400, so that the insulating film 400 continuously and stably separates the tab portion 210 from the battery case 100.

In one embodiment, as shown in fig. 5, a connection point a between the insulating film 400 and the lower plastic 330 is disposed around the post 320.

It should be noted that, the structural arrangement in this embodiment can reduce the risk of exposing the root of the tab 210, so as to further improve the safety performance of the battery. Specifically, if the connection point a between the insulating film 400 and the lower plastic 330 is insufficient, the root of the tab portion 210 may be exposed from the gap where the tab portion 210 is not connected to the lower plastic 330, and at this time, the tab portion 210 and the battery case 100 cannot be effectively isolated, thus risking a short circuit. It should be understood that the root of the tab 210 refers to: tab portion 210 is adjacent one end of pole 320.

In the specific arrangement of the connection point a between the insulating film 400 and the tab 210, as shown in fig. 5, the insulating film 400 and the lower plastic 330 are fixed at a plurality of connection points a, and the plurality of connection points a are spaced around the pole 320, so as to reduce the difficulty of preparation on the premise of effectively protecting the root of the tab 210. Of course, a plurality of connection points a may be further provided to connect into a wire, so that the insulation film 400 and the lower plastic 330 are fixed at each position surrounding the pole 320, and the connection strength of the insulation film 400 and the lower plastic 330 is further improved, so as to optimize the protection effect on the root of the pole ear 210.

It should be noted that, glue or glue layers may be used to bond the lower plastic 330 and the insulating film 400 to simplify the structure, or a hot-melt connection is used between the lower plastic 330 and the insulating film 400 to improve the connection strength.

In one embodiment, please continue to refer to the structure shown in fig. 5, the lower plastic 330 is rectangular; along the width direction of the lower plastic 330, the ratio between the minimum width of the portion of the post 320 exposed from the side surface of the lower plastic 330 facing the battery cell 200 and the width of the lower plastic 330 is: 0.2 to 0.8. It should be understood that if the pole 320 is cylindrical, the minimum width of the pole 320 refers to its diameter.

It should be noted that the structure in the embodiment of the present application may define the distance between the edge of the pole 320 and the edge of the lower plastic 330 along the width direction, so that the insulating film 400 is effectively sleeved and fixed on one side of the pole 320. Specifically, when the distance between the edge of the pole 320 and the edge of the lower plastic 330 is enough, the lower plastic 330 can reserve a sufficient distance for the insulating film 400 to provide a fixing point for convenient fixing.

It should be understood that if the distance between the edge of the pole 320 and the edge of the lower plastic 330 is too small, the insulation film 400 cannot be effectively fixed on the surface of the lower plastic 330; if the distance between the edge of the post 320 and the edge of the lower plastic 330 is too large, the over-current is affected. Thus, in the present embodiment, the ratio between the width d1 of the control post 320 and the width d2 of the lower plastic 330 is within the above range.

For example, when setting a ratio value between the width d1 of the pole 320 and the width d2 of the lower plastic 330, the ratio value may be set to one of the following values.

0.2、0.25、0.3、0.35、0.4、0.45、0.5、0.55、0.6、0.65、0.7、0.75、0.8。

In one embodiment, as shown in fig. 1 and referring to fig. 2 to 6, the lower plastic 330 is provided with an annular boss 3311, the annular boss 3311 is disposed around the pole 320, and the insulating film 400 is sleeved on a side of the annular boss 3311 facing away from the pole 320.

It should be noted that, the annular boss 3311 on the lower plastic 330 is disposed around the pole 320, so as to limit the pole 320 along the circumferential direction, thereby improving the stability after assembly. Meanwhile, the structure can reduce assembly difficulty and improve assembly efficiency.

As shown in fig. 5 and 6, the insulating film 400 is sleeved on the side of the annular boss 3311 facing away from the pole 320. It should be noted that the size of the through hole 410 of the insulating film 400 needs to be equal to or larger than the outer diameter of the annular boss 3311 so that the insulating film 400 is sleeved on the annular boss 3311.

In one embodiment, the size of the through hole 410 in the insulating film 400 is larger than the outer diameter of the annular boss 3311, and thus, a gap exists between the insulating film 400 and the sidewall of the annular boss 3311. When the gap value is set, the gap is required to be ensured to be in the range of 0.5 mm-5 mm.

Note that the gaps between the edges of the through hole 410 and the side walls of the annular boss 3311 of the insulating film 400 may be uniform or different. When the size of the through hole 410 on the insulating film 400 is specifically set, it is necessary to ensure that the gap between the insulating film 400 and the sidewall of the annular boss 3311 is greater than 0.5mm, so as to ensure that the insulating film 400 can be effectively sleeved on the surface of the annular boss 3311. At the same time, the gap cannot be too large, avoiding the root of tab 210 from being exposed from the gap.

In one embodiment, please continue to refer to the structure shown in fig. 1 to 6, the lower plastic 330 includes a main body 331 and two mutually independent protruding portions 332, the two protruding portions 332 are located at the side of the main body 331 facing the main body of the battery cell and are located at two opposite ends of the main body 331; the two protruding portions 332 are formed with accommodation spaces in cooperation with the body portion 331. As shown in fig. 2, the accommodating space has a first opening S1 at the side of the lower plastic 330 facing the battery cell 200, and the accommodating space has a second opening S2 in a plane perpendicular to the main body 331 and parallel to the arrangement direction of the two protruding portions 332. The second opening S2 extends from one protrusion 332 to the other protrusion 332, and the second opening S2 communicates with the first opening S1; the tab 210 led out from the cell body is bent from the first opening S1 into the receiving space and connected to the post 320. It should be appreciated that the body portion 331 and the projection 332 are schematically separated by a dashed line in fig. 2-5 to more clearly illustrate the relevant structure; the post 320 penetrates the body 331, and the insulating film 400 is fixed to the body 331.

In the present embodiment, the accommodating space between the two protruding portions 332 is not blocked by the barrier portion at the first opening S1 and the second opening S2. At this time, the tab portion 210 drawn from the cell main body may contact the battery case 100 from the second opening S2 when the tab 320 is connected. Accordingly, the insulating film 400 is provided in this embodiment to effectively separate the tab portion 210 from the battery housing 100, so as to reduce the risk of short circuit caused by contact between the tab portion 210 and the inner wall of the battery housing 100, thereby improving the safety performance of the battery, improving the production yield of the battery, and prolonging the service life of the battery.

Meanwhile, since the tab portion 210 and the battery case 100 are separated by the insulating film 400 in the battery, the insulating film 400 occupies less space inside the battery, so that the space utilization rate inside the battery case 100 can be improved, and the energy density of the battery can be improved.

It should be noted that, with continued reference to the structure shown in fig. 2, in the present embodiment, along the arrangement direction of the two protruding portions 332, the size of the second opening S2 is consistent with the spacing between the two protruding portions 332 on the side facing each other. That is, along the arrangement direction of the two protruding portions 332, the second opening S2 is not covered by other structures to avoid the welding apparatus, so that the welding apparatus has a sufficient operation space, the assembly difficulty is reduced, the assembly efficiency of the battery is improved, and the manufacturing cost is reduced.

In one embodiment, please continue to refer to the structure shown in fig. 2, along the direction that the protrusion 332 faces away from the cover body 310, the height of the protrusion 332 is equal to the size of the second opening S2.

It should be noted that, in this embodiment, the second opening S2 extends from the surface of the body 331 where the protrusion 332 is disposed, that is, along the protruding direction of the protrusion 332, the second opening S2 is not shielded, so that the welding device can better avoid, and the welding device has sufficient operation space, so that the assembly difficulty is reduced, the assembly efficiency of the battery is improved, and the preparation cost is further reduced.

In one embodiment, the height of the protrusion 332 is in the range of 3mm to 8mm along the direction of the protrusion 332 facing away from the cover body 310.

It should be noted that, if the protruding height of the protruding portion 332 is too high, the less the root portion of the tab portion 210 can be wrapped by the insulating film 400, the insulation protection effect of the insulating film 400 on the tab portion 210 will be reduced; if the protruding height of the protruding portion 332 is too short, the protruding portion 332 cannot well limit the battery cell body, so that the battery cell 200 is easy to move in the battery case 100, and the safety performance of the battery is reduced. Thus, the present embodiment provides the height of the protrusion 332 within the above-described range, and can ensure the protective effect of the insulating film 400 on the tab portion 210 and the limit effect of the protrusion 332 on the battery cell 200.

For example, when the height of the protrusion 332 is set, the height of the protrusion 332 may be set to one of the following values.

3mm、3.5mm、4mm、4.5mm、5mm、5.5mm、6mm、6.5mm、7mm、7.5mm、8mm。

In one embodiment, the battery provided by the embodiment of the application further comprises a battery cell protection film, wherein the battery cell protection film is wrapped on the surface of the battery cell main body, and an opening is formed in one side of the battery cell protection film, which faces the cover plate assembly 300; the insulating film 400 covers at least part of the opening.

Specifically, in the present embodiment, the insulating film 400 is an independent insulating film 400, so as to adapt to the mounting position of the tab portion 210, effectively separate the tab portion 210 from the battery case 100, and improve the separation effect.

It should be noted that, when the insulating film 400 separately provided in this embodiment is disposed, the flexibility of setting is higher, so that the adaptation degree between the insulating film 400 and the tab portion 210 can be improved, so as to perform effective insulation protection on the root portion of the tab portion 210.

It should be understood that, if the hole structure is disposed on the surface of the battery cell protection film to cover the tab portion 210, the battery cell protection film will be clamped at the portion of the tab portion 210 near the battery cell main body, so that most of the area of the tab portion 210 and the root of the tab portion 210 cannot be effectively protected, and the tab portion 210 is not easy to pass through the hole structure and be welded with the pole 320.

In one embodiment, please continue to refer to the structure shown in fig. 1 in conjunction with fig. 2, at least a portion of the insulating film 400 is wrapped around and connected to the surface of the cell body.

Specifically, in the present embodiment, the insulating film 400 extends to the surface of the cell body and is fixed to the cell body. Accordingly, the free end of the insulating film 400 is fixed, and the insulating film 400 can always effectively separate the tab portion 210 and the battery case 100 during assembly and use, thereby preventing the tab portion 210 from contacting the battery case 100 and shorting, and improving the safety performance of the battery.

It should be understood that the central region of the insulating film 400 is covered with the post 320, and the edge portion of the insulating film 400 remote from the central region forms a free end.

In addition, it should be noted that the structure of fixing the insulating film 400 to the cell body can increase the fixing area of the insulating film 400 to improve the fixing effect of the insulating film 400. Preferably, the insulating film 400 is fixed to two large faces of the cell body disposed opposite to each other, so as to further increase the fixing area.

It should be noted that, in this specific embodiment, since the surface of the cell body is covered with the cell protection film, the insulating film 400 may be directly fixed on the surface of the cell body when fixed on the cell body, or may be fixed on the cell protection film on the surface of the cell body.

In one embodiment, the insulating film 400 is made of one of PET (polyethylene glycol terephthalate, polyethylene terephthalate), PP (polypropylene) or PE (polyethylene).

Of course, two or more of PET, PP and PE may be selected for compounding to form the insulating film 400, which will not be described in detail.

In a specific embodiment, the insulating film 400 is a mylar film.

In one embodiment, with continued reference to the structure illustrated in fig. 2-5, tab portion 210 is directly connected to pole 320.

In the present embodiment, the tab 210 is directly connected to the pole 320 without the adapter, so that the tab 210 has a relatively long size, is easier to contact the battery case 100, and needs to be protected. Therefore, the insulating film 400 is sleeved outside the pole 320 to protect the pole ear 210, so that the risk of contact and short circuit between the pole ear 210 and the inner wall of the battery housing 100 is reduced, and the safety performance of the battery can be improved, the preparation yield of the battery is improved, and the service life of the battery is prolonged.

In a second aspect, embodiments of the present application provide a battery pack. The battery pack includes the battery provided in any of the above-described first aspects.

In assembling the battery in the battery pack provided in the embodiments of the present application, the through hole 410 of the insulating film 400 may be exposed to the surface of the cover plate body 310 facing the battery cell 200, so that the internal conductive structure formed after the connection of the electrode 320 and the tab portion 210 passes through the insulating film 400 from the through hole 410. In the process of connecting the tab portion 210 and the pole 320, the insulating film 400 can be in an unfolded state so as to avoid the welding equipment, so that the welding equipment has sufficient operation space, the assembly difficulty is reduced, the assembly efficiency of the battery is improved, and the preparation cost is further reduced. Thereafter, the insulating film 400 may be bent such that at least a portion of the insulating film 400 is interposed between the tab portion 210 and the battery case 100, effectively separating the tab portion 210 from the battery case 100.

It should be noted that, in the battery pack provided in this embodiment of the present application, the battery sets up the tab portion 210 of the insulating film 400 covering the electric core 200 to isolate the tab portion 210 and the inner wall of the battery housing 100 through the insulating film 400, reduce the risk of the contact between the tab portion 210 and the inner wall of the battery housing 100 and the occurrence of short circuit, and then may improve the safety performance of the battery, so as to improve the preparation yield of the battery and prolong the service life of the battery.

Meanwhile, since the tab portion 210 and the battery case 100 are separated by the insulating film 400 in the battery, the insulating film 400 occupies less space inside the battery, so that the space utilization rate inside the battery case 100 can be improved, and the energy density of the battery can be improved.

In one embodiment, the battery pack is a battery module or a battery pack.

The battery module includes a plurality of batteries, and the battery module can also include end plate and curb plate, and end plate and curb plate are used for fixed a plurality of batteries. The battery module may further include a bracket to which the battery may be fixed.

The battery pack comprises a plurality of batteries and a box body, wherein the box body is used for fixing the plurality of batteries.

The battery pack includes a plurality of batteries, and the plurality of batteries are disposed in the case. Wherein, a plurality of batteries can be installed in the box after forming the battery module. Or, a plurality of batteries can be directly arranged in the box body, namely, the plurality of batteries do not need to be grouped, and the plurality of batteries are fixed by the box body.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the utility model disclosed herein. This application is intended to cover any variations, uses, or adaptations of the utility model following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains. The specification and example embodiments are to be considered exemplary only, with a true scope and spirit of the application being indicated by the following claims. It is to be understood that the present application is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of protection of the application is limited only by the claims that follow.

Claims (14)

1. A battery, comprising:

a battery housing having an opening;

the battery cell is arranged in the battery shell and comprises a battery cell main body and a pole ear part, and the pole ear part is led out from the battery cell main body;

the cover plate assembly is buckled with the opening; the cover plate assembly comprises a cover plate body and a pole, wherein the pole is arranged on the cover plate body and is exposed on the surface of one side of the cover plate body, which faces the battery cell; the tab portion connects the pole to an internal conductive structure located inside the battery housing with the pole;

an insulating film disposed within the battery case; the insulating film is provided with a through hole, the internal conductive structure passes through the insulating film from the through hole, and at least part of the insulating film covers the tab part so as to separate the tab part from the battery shell.

2. The battery of claim 1, wherein the terminal post extends beyond the cover body on a side of the cover assembly facing the battery cell, and the insulating film is sleeved outside a portion of the terminal post extending beyond the cover body.

3. The battery of claim 1 or 2, wherein the cover assembly further comprises a lower plastic located on a side of the cover body facing the cell; the pole is exposed out of the surface of the lower plastic, which faces the side of the battery cell; the insulating film is partially overlapped with the lower plastic and connected to the lower plastic.

4. The battery of claim 3, wherein a connection point between the insulating film and the lower plastic is disposed around the post.

5. The battery of claim 4, wherein the lower plastic is rectangular parallelepiped; along the width direction of the lower plastic, the ratio between the minimum width of the part of the pole exposed out of the lower plastic towards one side surface of the battery cell and the width of the lower plastic is as follows: 0.2 to 0.8.

6. The battery of claim 3, wherein the lower plastic is provided with an annular boss, the annular boss is arranged around the pole, and the insulating film is sleeved on one side of the annular boss, which is opposite to the pole.

7. The battery of claim 6, wherein a gap exists between the insulating film and the side wall of the annular boss, the gap ranging from 0.5mm to 5mm.

8. The battery of claim 3, wherein the lower plastic comprises a body portion and two mutually independent protruding portions, wherein the two protruding portions are positioned at one side of the body portion facing the cell main body and are arranged at opposite ends of the body portion; the two protruding parts and the body part are matched to form an accommodating space, the accommodating space is provided with a first opening at one side of the lower plastic towards the battery cell, the accommodating space is provided with a second opening in a plane perpendicular to the body part and parallel to the arrangement direction of the two protruding parts, the second opening extends from one protruding part to the other protruding part, and the second opening is communicated with the first opening; the tab part led out from the battery cell main body is bent from the first opening in the accommodating space and is connected with the pole.

9. The battery of claim 8, wherein the height of the protrusion is equal to the size of the second opening in a direction in which the protrusion faces away from the cap body.

10. The battery of claim 9, wherein the height of the protrusion is in the range of 3mm to 8mm along the direction of the protrusion facing away from the cover body.

11. The battery according to claim 1 or 2, further comprising a cell protection film, wherein the cell protection film is wrapped on the surface of the cell main body, and an opening is formed on one side of the cell protection film facing the cover plate assembly; the insulating film covers at least part of the opening.

12. The battery of claim 11, wherein at least a portion of the insulating film is wrapped around and attached to a surface of the cell body.

13. The battery of claim 1 or 2, wherein the tab portion is directly connected to the post.

14. A battery comprising a battery as claimed in any one of claims 1 to 13.