Patent Description:
In the related art, the outer surface of the cell of a battery can be insulated and protected by an insulating film. Due to the limitation of the connection mode of the insulating film, the stability of the insulating film is relatively poor, and the insulating film is likely to separate from the outer surface of the cell.

Document <CIT> provides a battery cell comprises a housing, a circuit assembly, and an end cap assembly. The housing has an opening. An electrode assembly is disposed within the housing. The electrode assembly comprises body parts and tabs. The tabs extend from an end part of each body part toward the opening.

Document <CIT> provides a secondary battery includes an electrode assembly and a casing.

Document <CIT> provides a secondary battery includes an electrode assembly including a first electrode plate, a separator, and a second electrode plate; a case having an internal space in which the electrode assembly is accommodated; a cap plate covering the case; a terminal penetrated through the cap plate and electrically connected to the electrode assembly; and an adhesive tape adhered on outer surfaces of the case.

The following disclosure serves a better understanding of the present invention. The present disclosure provides a cylindrical battery, including:.

For a better understanding of the disclosure, reference may be made to exemplary embodiments shown in the following drawings. The components in the drawings are not necessarily to scale and related elements may be omitted, or in some instances proportions may have been exaggerated, so as to emphasize and clearly illustrate the features described herein. In addition, related elements or components can be variously arranged, as known in the art. Further, in the drawings, like reference numerals designate same or like parts throughout the several views.

The technical solutions in the exemplary embodiments of the disclosure will be described clearly and explicitly in conjunction with the drawings in the exemplary embodiments of the disclosure. The description proposed herein is just the exemplary embodiments for the purpose of illustrations only, not intended to limit the scope of the disclosure. The scope of protection is defined in the appended claims.

In the description of the present disclosure, unless otherwise specifically defined and limited, the terms "first", "second" and the like are only used for illustrative purposes and are not to be construed as expressing or implying a relative importance. The term "plurality" is two or more.

In particular, a reference to "the" object or "a" and "an" object is intended to denote also one of a possible plurality of such objects. Unless otherwise defined or described, the terms "connect", "fix" should be broadly interpreted, for example, the term "connect" can be "fixedly connect", "detachably connect", "integrally connect", "electrically connect" or "signal connect". The term "connect" also can be "directly connect" or "indirectly connect via a medium". For the persons skilled in the art, the specific meanings of the abovementioned terms in the present disclosure can be understood according to the specific situation.

Further, in the description of the present disclosure, it should be understood that spatially relative terms, such as "above", "below" "inside", "outside" and the like, are described based on orientations illustrated in the figures, but are not intended to limit the exemplary embodiments of the present disclosure.

In the context, it should also be understood that when an element or features is provided "outside" or "inside" of another element(s), it can be directly provided "outside" or "inside" of the other element, or be indirectly provided "outside" or "inside" of the another element(s) by an intermediate element.

An embodiment of the present disclosure provides a cylindrical battery. Please refer to <FIG>. The cylindrical battery includes: a battery housing <NUM>; a cell <NUM>, which is disposed in the battery housing <NUM>, and the cell <NUM> includes a cell body <NUM> and a tab portion <NUM>; the tab portion <NUM> extends from at least one side of the cell body <NUM>; a first insulating film <NUM>, which is arranged on the outer surface of the cell body <NUM>, and is fixedly connected with the cell <NUM>; a second insulating film <NUM>, which is arranged on the outer surface of the cell body <NUM>, the second insulating film <NUM> covers at least a portion of the first insulating film <NUM> and is fixedly connected to the first insulating film <NUM>, and one end of the second insulating film <NUM> is not lower than the end surface of the cell body <NUM> where the tab portion <NUM> is provided, and the other end of the second insulating film <NUM> overlaps the first insulating film <NUM> so that a portion of the second insulating film <NUM> overlaps the first insulating film <NUM>.

A cylindrical battery in an embodiment of the present disclosure includes a battery housing <NUM>, a cell <NUM>, a first insulating film <NUM> and a second insulating film <NUM>. The cell <NUM> is disposed in the battery housing <NUM>, and at least one side of the cell body <NUM> extends from a tab portion <NUM>. By arranging the first insulating film <NUM> and the second insulating film <NUM> on the outer surface of the cell body <NUM>, it is possible to realize the insulating protection of the cell body <NUM>. By covering part of the second insulating film <NUM> with the first insulating film <NUM>, and setting one end of the second insulating film <NUM> not to be lower than the end surface of the cell body <NUM> where the tab portion <NUM> is arranged, the other end of the second insulating film <NUM> is overlapped with the first insulating film <NUM>. On the basis of ensuring that the second insulating film <NUM> achieves insulation protection, the second insulating film <NUM> may also be pressed against the first insulating film <NUM> to improve the insulation performance of the first insulating film <NUM> on the cell body <NUM>. Meanwhile, the restraint to the cell body <NUM> is improved, so as to avoid the insulation failure caused by the loosening of the first insulating film <NUM> and the lack of internal preload that affect the overall energy density of the cylindrical battery, thereby improving the use performance of the cylindrical battery.

It should be noted that the first insulating film <NUM> may cover the entire outer circumferential surface of the cell body <NUM> to achieve reliable insulation protection for the cell body <NUM>, and may provide a preload force to the cell body <NUM>. Moreover, the second insulating film <NUM> is wound on the outer circumferential surface of the cell body <NUM>, that is, the second insulating film <NUM> is wound on the first insulating film <NUM>, so that it is possible to prevent the second insulating film <NUM> from falling apart from the cell body <NUM> on the basis of providing insulating protection and restraint to the cell body <NUM>. In this manner, it may be ensured that the cell body <NUM> has sufficient insulation performance and avoid the risk of insulation failure between the cell body <NUM> and the battery housing <NUM>. In some embodiments, it is not excluded that the first insulating film <NUM> may cover a portion of the outer circumferential surface of the cell body <NUM>.

The first insulating film <NUM> may be fixedly connected to the cell <NUM>. In this case, the first insulating film <NUM> may be directly fixedly connected to the cell body <NUM>. For example, the first insulating film <NUM> may be bonded to the cell body <NUM>, or the first insulating film <NUM> may be connected to the cell body <NUM> through the second insulating film <NUM>. For example, there may be no adhesive layer provided between the second insulating film <NUM> and the cell body <NUM>, and the second insulating film <NUM> may be bonded to the first insulating film <NUM>, and the second insulating film <NUM> may be directly bonded to the cell body <NUM>.

The second insulating film <NUM> is fixedly connected to the first insulating film <NUM>, and the second insulating film <NUM> and the first insulating film <NUM> may be directly and fixedly connected. For example, the second insulating film <NUM> and the first insulating film <NUM> are adhesively connected, or the first insulating film <NUM> may be adhesively connected to the cell body <NUM>, and there may be no adhesive layer disposed between the second insulating film <NUM> and the first insulating film <NUM>, and the second insulating film <NUM> may be bonded to the cell body <NUM>.

The battery includes a cell and an electrolyte, the minimum unit capable of performing electrochemical reactions such as charging/discharging. The cell refers to a unit formed by winding or laminating a stack portion including a first electrode, a separator and a second electrode. When the first electrode is a positive electrode, the second electrode is a negative electrode, and the polarities of the first electrode and the second electrode are interchangeable. The first electrode and the second electrode are coated with an active material.

The cell may also be a wound cell, that is, the first electrode, the second electrode that is electrically opposite to the first electrode, and the separator disposed between the first electrode and the second electrode are wound to obtain the would cell. The first insulating film <NUM> covers the wound cell, and the second insulating film <NUM> covers the first insulating film <NUM> to protect the first insulating film <NUM>.

In an embodiment, the adhesive connection between the first insulating film <NUM> and the cell <NUM> is not only a simple connection, but also the cylindrical battery is less likely to accumulate a large diameter. Moreover, the connection stability of the first insulating film <NUM> and the cell <NUM> may be ensured. In this way, it may be ensured that the first insulating film <NUM> reliably protects the cell <NUM>.

In an embodiment, the second insulating film <NUM> is adhesively connected to the first insulating film <NUM>, so as to simplify the connection between the second insulating film <NUM> and the first insulating film <NUM>, and ensure the reliable connection between the second insulating film <NUM> and the first insulating film <NUM>, so as to ensure that the restraint to the cell body <NUM> is improved.

In an embodiment, the first insulating film <NUM> is adhesively connected to the cell <NUM>, and the second insulating film <NUM> is adhesively connected to the first insulating film <NUM>, so as to ensure that the first insulating film <NUM> and the second insulating film <NUM> realize reliable insulation protection for the cell body <NUM>.

In an embodiment, one end of the second insulating film <NUM> is disposed beyond an end surface of the cell body <NUM> where the tab portion <NUM> is provided, so that a portion of the second insulating film <NUM> is located outside the outer circumferential surface of the tab portion <NUM>, thereby realizing the circumferential protection for the tab portion <NUM>. In this manner, the second insulating film <NUM> may form insulating protection for the tab portion <NUM> to some extent.

In an embodiment, one end of the second insulating film <NUM> is not lower than an end surface of the tab portion <NUM> away from the cell body <NUM>, that is, the second insulating film <NUM> may protect the entire outer circumferential surface of the tab portion <NUM>, so as to ensure that the tab portion <NUM> and the battery housing <NUM> can be reliably insulated from each other, so as to ensure the safe use performance of the battery.

The length of one end of the second insulating film <NUM> disposed beyond an end surface of the cell body <NUM> where the tab portion <NUM> is provided is not less than the length of the tab portion <NUM>. Therefore, on the basis of effectively protecting the first insulating film <NUM> by the second insulating film <NUM>, the second insulating film <NUM> may also protect the tab portion <NUM>, thereby improving the insulating performance between the cell <NUM> and the battery housing <NUM>.

In an embodiment, one end of the second insulating film <NUM> is disposed beyond an end surface of the tab portion <NUM> to be in contact with the battery housing <NUM>, so that the second insulating film <NUM> may maximize the insulating protection function and improve the internal safety performance of the battery.

In an embodiment, one end of the second insulating film <NUM> is bonded to the battery housing <NUM>, so as to improve the connection stability of the second insulating film <NUM> and avoid problems such as falling off of the second insulating film <NUM>, so as to further improve insulation protection of the second insulating film <NUM> and the first insulating film <NUM> for the cell <NUM>.

In an embodiment, the overlapping area of the second insulating film <NUM> and the first insulating film <NUM> accounts for <NUM>% to <NUM>% of the outer circumferential surface area of the cell body <NUM>. On the basis of ensuring that the second insulating film <NUM> serves a fixing and protecting function on the first insulating film <NUM>, it is possible to avoid the problem that the overlapping area of the second insulating film <NUM> and the first insulating film <NUM> is too large. In this manner, it may be avoided to some extent that the thickness is too large and affects the overall space utilization of the battery.

If the overlapping area of the second insulating film <NUM> and the first insulating film <NUM> is too small, the binding force between the second insulating film <NUM> and the first insulating film <NUM> will be insufficient, and the risk of the first insulating film <NUM> falling off and the insulation failure will occur. When the overlapping area of the second insulating film <NUM> and the first insulating film <NUM> is too large, the overall thickness inside the battery housing <NUM> will increase and the overall space utilization rate of the battery will be affected.

The overlapping area of the second insulating film <NUM> and the first insulating film <NUM> may account for <NUM>%, <NUM>%, <NUM>%, <NUM>%, <NUM>%, <NUM>%, <NUM>%, <NUM>%, <NUM>%, <NUM>%, <NUM>%, <NUM>%, <NUM>%, <NUM>%, <NUM>%, <NUM>%, or <NUM>%, etc. of the outer circumferential surface area of the cell body <NUM>.

In an embodiment, the overlapping width of the second insulating film <NUM> and the first insulating film <NUM> is <NUM> to <NUM>, so that the second insulating film <NUM> may provide sufficient binding force for the first insulating film <NUM> to prevent the first insulating film <NUM> from loosening and falling apart. Also, it is possible to avoid the problem that the area of the second insulating film <NUM> is too large and avoid the increase of large space inside the battery housing <NUM>. The overlapping width of the second insulating film <NUM> and the first insulating film <NUM> may be regarded as the size of the overlapping part of the second insulating film <NUM> and the first insulating film <NUM> along the direction in which the tab portion <NUM> extends from the cell body <NUM>.

The overlapping width of the second insulating film <NUM> and the first insulating film <NUM> may be <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> or <NUM>, and so on.

In an embodiment, the thickness of the first insulating film <NUM> is <NUM> to <NUM>. On the basis of ensuring that the first insulating film <NUM> can achieve reliable insulating performance, it is also possible to prevent the first insulating film <NUM> from being too thick and occupying too much space, thus reducing the weight of the first insulating film <NUM>.

The thickness of the first insulating film <NUM> may be <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>, or the like.

In an embodiment, the thickness of the second insulating film <NUM> may be <NUM> to <NUM>. On the basis of ensuring that the second insulating film <NUM> can reliably protect the first insulating film <NUM> and can achieve reliable insulating performance, it is also possible to prevent the second insulating film <NUM> from being too thick and occupying too much space, thus reducing the weight of the second insulating film <NUM>.

The thickness of the second insulating film <NUM> may be <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>, or the like.

In an embodiment, the thickness of the first insulating film <NUM> may be greater than the thickness of the second insulating film <NUM>, so as to improve the insulating performance of the first insulating film <NUM> to the cell body <NUM> and improve the restraint to the cell body <NUM>, while the second insulating film <NUM> will not cause too much increase in the diameter of the cylindrical battery, so as to ensure that the cylindrical battery has a high volumetric energy density.

In some embodiments, it is not excluded that the thickness of the first insulating film <NUM> may be equal to the thickness of the second insulating film <NUM>.

In an embodiment, the adhesive strength of the first insulating film <NUM> is greater than the adhesive strength of the second insulating film <NUM>, so that the first insulating film <NUM> may be reliably bonded to the cell body <NUM>, and the second insulating film <NUM> may also be easily bonded to the first insulating film <NUM>, so as to ensure that the second insulating film <NUM> is able to protect the first insulating film <NUM>.

The first insulating film <NUM> may effectively cover the cell body <NUM>, thereby providing sufficient restraint force to the cell body <NUM>, and may prevent the first insulating film <NUM> from detaching from the cell body <NUM>. The second insulating film <NUM> is mainly provided for protecting the first insulating film <NUM>. Therefore, the adhesive strength of the second insulating film <NUM> may be relatively small, so as to facilitate the second insulating film <NUM> to be bonded to the cell body <NUM>.

The adhesive strength of the first insulating film <NUM> is greater than that of the second insulating film <NUM>, that is, the peeling force of the first insulating film <NUM> is greater than the peeling force of the second insulating film <NUM>. The second insulating film <NUM> may be removed from the first insulating film <NUM>, so as to facilitate the replacement of the second insulating film <NUM>.

In some embodiments, it is not excluded that the adhesive strength of the first insulating film <NUM> is equal to the adhesive strength of the second insulating film <NUM>.

In an embodiment, the second insulating film <NUM> is formed with an overlapping region, so that the second insulating film <NUM> can form a circumferentially closed space, thereby improving the protection that the second insulating film <NUM> provides for the first insulating film <NUM>, so as to avoid the risk of falling off of the first insulating film <NUM> and the like.

The second insulating film <NUM> is formed with an overlapping region, that is, the second insulating film <NUM> may have a first end and a second end, and the first end may be covered by the second insulating film <NUM>, so that the second insulating film <NUM> is formed with an overlapping region. In this manner, not only can high-efficiency protection for the first insulating film <NUM> be achieved, but also the insulating protection capability of the second insulating film <NUM> may be improved.

In an embodiment, the width of the overlapping region is <NUM> to <NUM>. On the basis of ensuring that the second insulating film <NUM> can have reliable connection strength and restraint force, it is also possible to prevent the thickness of the second insulating film <NUM> from increasing too much. Accordingly, the overall weight of the battery is reduced.

The width of the overlapping region may be <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> or <NUM> and so on.

In an embodiment, the first insulating film <NUM> is a first adhesive tape, and the second insulating film <NUM> is a second adhesive tape, so that the first insulating film <NUM> may be reliably bonded to the cell body <NUM> and the second insulating film <NUM> can be reliably bonded to the first insulating film <NUM>, thereby improving the insulating protection capability of the first insulating film <NUM> and the second insulating film <NUM>, thereby ensuring the safe use performance of the battery.

The adhesive layer of the first insulating film <NUM> is bonded to the cell body <NUM>, and the adhesive layer of the second insulating film <NUM> is bonded to the first insulating film <NUM>.

In an embodiment, the tab portion <NUM> includes a positive tab and a negative tab, and the positive tab and the negative tab extend from the same side of the cell body <NUM>. The positive tab and the negative tab are extended from the same side of the cell body <NUM>, so as to improve the overall space utilization rate inside the battery. Moreover, it is possible for the positive tab and the negative tab to be respectively connected to the positive pole rod and the negative pole rod located on the same side of the battery housing <NUM>. Or, the positive tab and the negative tab are respectively connected to the battery housing <NUM> and the pole rod, and the battery housing <NUM> serves as an electrode terminal of the battery, which can facilitate the subsequent connection of batteries in groups. Furthermore, the battery housing <NUM> has a relatively large area, which may ensure a reliable overcurrent area when the batteries are grouped, so as to ensure the overall charging and discharging rate of the battery.

In some embodiments, it is not excluded that the positive tab and the negative tab may extend from opposite sides of the cell body <NUM>.

It should be noted that there may be multiple positive tabs and negative tabs, and the positive tabs and the negative tabs may be alternately arranged to ensure the insulation performance between the positive tabs and the negative tabs. Alternatively, the number of the positive tab and the negative tab may be one.

In an embodiment, as shown in <FIG>, the battery housing <NUM> includes: a first housing member <NUM> and a second housing member <NUM>. The second housing member <NUM> is connected with the first housing member <NUM> to achieve effective protection for the cell <NUM>.

In an embodiment, the first housing member <NUM> is a cover plate, the tab portion <NUM> extends toward the cover plate, the second housing member <NUM> may be formed with an accommodating space, and the second insulating film <NUM> may be connected to the first housing member <NUM>. The setting of the cover plate may also facilitate the assembly of the battery. In some embodiments, both the first housing member <NUM> and the second housing member <NUM> may be formed with accommodating spaces.

A pole assembly <NUM> may be disposed on the first housing member <NUM>, and the pole assembly <NUM> and the battery housing <NUM> may be electrically connected to two tab portions <NUM> with different polarities, respectively. The pole assembly <NUM> and the battery housing <NUM> may be directly connected to two tab portions <NUM> of different polarities, respectively, or, the pole assembly <NUM> and the battery housing <NUM> may be respectively connected to two tab portions <NUM> of different polarities through two current collectors.

The first housing member <NUM> includes steel and the second housing member <NUM> includes steel. Alternatively, the first housing member <NUM> includes aluminium and the second housing member <NUM> includes aluminium. The first housing member <NUM> may include a composite metal material, e.g., the first housing member <NUM> may include a copper-aluminum composite material, and the second housing member <NUM> may include a composite metal material, e.g., the second housing member <NUM> may include copper-aluminum composite material.

The first housing member <NUM> and the second housing member <NUM> may be welded together, or the first housing member <NUM> and the second housing member <NUM> may be riveted together.

An embodiment of the present disclosure also provides a battery set including the above cylindrical battery.

A battery set in an embodiment of the present disclosure includes a cylindrical battery. The cylindrical battery includes a battery housing <NUM>, a cell <NUM>, a first insulating film <NUM> and a second insulating film <NUM>. The cell <NUM> is disposed in the battery housing <NUM>, and a tab portion <NUM> extends from at least one side of the cell body <NUM>. By arranging the first insulating film <NUM> and the second insulating film <NUM> on the outer surface of the cell body <NUM>, it is possible to realize the insulating protection of the cell body <NUM>. By covering part of the second insulating film <NUM> with the first insulating film <NUM>, and setting one end of the second insulating film <NUM> not to be lower than the end surface of the cell body <NUM> where the tab portion <NUM> is arranged, the other end of the second insulating film <NUM> is overlapped with the first insulating film <NUM>. On the basis of ensuring that the second insulating film <NUM> achieves insulation protection, the second insulating film <NUM> may also be pressed against the first insulating film <NUM> to improve the insulation performance of the first insulating film <NUM> on the cell body <NUM>. Meanwhile, the restraint to the cell body <NUM> is improved, so as to avoid the insulation failure caused by the loosening of the first insulating film <NUM> and the lack of internal preload that affect the overall energy density of the cylindrical battery, thereby improving the use performance of the battery set.

In an embodiment, the battery set is a battery module or a battery pack.

The battery module includes a plurality of cylindrical batteries, the battery module may further include a bracket, and the cylindrical battery may be fixed on the bracket.

The battery pack includes a plurality of cylindrical batteries and a box body, and the box body is provided for fixing the plurality of cylindrical batteries.

It should be noted that the battery pack includes cylindrical batteries, and the number of cylindrical batteries may be multiple, and the multiple cylindrical batteries are arranged in the box body. The multiple cylindrical batteries may be formed into a battery module and then arranged in the box body. Alternatively, the multiple cylindrical batteries may be directly arranged in the box body, that is, the box body is used to fix the multiple batteries with no need to arrange the multiple batteries into groups.

Claim 1:
A cylindrical battery, comprising:
a battery housing (<NUM>);
a cell (<NUM>), which is arranged in the battery housing (<NUM>), and comprises a cell body (<NUM>) and a tab portion (<NUM>), wherein the tab portion (<NUM>) is extended from at least one side of the cell body (<NUM>);
a first insulating film (<NUM>), which is arranged on an outer surface of the cell body (<NUM>), and is fixedly connected with the cell (<NUM>);
a second insulating film (<NUM>), which is arranged on the outer surface of the cell body (<NUM>), and covers at least a portion of the first insulating film (<NUM>), and is fixedly connected with the first insulating film (<NUM>), wherein one end of the second insulating film (<NUM>) is not lower than an end surface of the cell body (<NUM>) where the tab portion (<NUM>) is arranged, and the other end of the second insulating film (<NUM>) overlaps the first insulating film (<NUM>) so that a portion of the second insulating film (<NUM>) overlaps the first insulating film (<NUM>),
wherein the first insulating film (<NUM>) is adhesively connected to the cell (<NUM>), and/or the second insulating film (<NUM>) is adhesively connected to the first insulating film (<NUM>),
wherein an overlapping area of the second insulating film (<NUM>) and the first insulating film (<NUM>) accounts for <NUM>% to <NUM>% of an outer circumferential surface area of the cell body (<NUM>),
wherein an overlapping width of the second insulating film (<NUM>) and the first insulating film (<NUM>) is <NUM> to <NUM>,
wherein a thickness of the first insulating film (<NUM>) is <NUM> to <NUM>, and
wherein the first insulating film (<NUM>) is a first adhesive tape, and the second insulating film (<NUM>) is a second adhesive tape.