Patent Description:
An electronic atomization device has a similar look and taste to regular cigarettes, but typically does not contain harmful ingredients such as tar and suspended particles found in cigarettes. Therefore, the electronic atomization device is widely used as an alternative to cigarettes.

As a core component of the electronic atomization device, the atomization assembly generally includes a substrate and a heating element. The heating element is arranged on an atomizing surface of the substrate. When the heating element is energized to generate heat, an aerosol-forming matrix on the atomizing surface can absorb the heat to form, by atomization, aerosol for user suction. However, distribution of thermal fields generated by conventional heating elements is not uniform, which leads to a local high-temperature region and a local low-temperature region on the atomizing surface, and finally leads to burnt taste and various harmful substances produced by the aerosol-forming matrix in the local high-temperature region due to a too high temperature. Liquid in the local low-temperature region cannot be atomized effectively due to the too high temperature. <CIT> discloses a porous heating body and an atomizer employing the same, the porous heating body comprising a porous body. The porous body comprises a first porous part, a second porous part and a third porous part which are sequentially arranged along the length direction; the cross-sectional areas of the first porous part and the third porous part are greater than that of the second porous part along the width direction. The porous body is provided thereon with a heating element extending along the length direction, and the heating element is provided with a heating part; at least a part of the extending length of the heating part overlaps the extending length of the second porous part. The porous body is a dumbbell shape having a small middle part and two thick ends, wherein the middle part of the porous heating body has a relatively shorter e-liquid conducting distance. <CIT> discloses a cartridge for use with a vaporization device comprising a first heating element, a first compartment for containment of a first vaporizable material, and a second compartment for containment of a second vaporizable material, wherein the device generates an aerosol for inhalation by a subject by heating the first vaporizable material or the second vaporizable material. <CIT> a fluid permeable heater assembly for aerosol-generating systems comprises a substrate comprising an opening through the substrate, an electrically conductive substantially flat filament arrangement arranged over the opening, and clamping means mechanically fixing the filament arrangement to the substrate. The clamping means are electrically conductive and serve as electrical contacts for providing a heating current through the filament arrangement.

One technical problem is to provide an improved atomization assembly. In particular, one technical problem solved in the present application is how to improve uniformity of thermal field distribution of an atomization assembly.

According to an aspect, it is provided an atomization assembly, characterized by comprising: a substrate comprising an atomizing surface configured to atomize an aerosol-forming matrix to form aerosol; and a heating element to heat the atomizing surface, the heating element being connectable to a power source, the heating element being directly or indirectly arranged on the atomizing surface; the heating element comprising at least a first heating portion and at least a second heating portion, wherein the first heating portion and the second heating portion are configured to generate heat differently per unit length and per unit time.

According to another aspect, it is provided an electronic atomization device characterized by comprising the atomization assembly.

In one embodiment, the first heating portion and the second heating portion are connected in series and/or in parallel.

In one embodiment, the first heating portion generates more heat per unit length and per unit time than the second heating portion, and projections of the first heating portion and the second heating portion adjacent to each other on the heating element in normal directions of respective extension paths overlap at least partially.

In one embodiment, resistivity of the second heating portion is less than that of the first heating portion; the resistivity of the second heating portion ranges from <NUM>Ω•mm to <NUM> mΩ•mm, and the resistivity of the first heating portion ranges from <NUM>Ω•mm to <NUM> mΩ•mm.

In one embodiment, the second heating portion is made of at least one of gold, silver or copper; and/or the first heating portion is made of at least one of ruthenium or nickel.

In one embodiment, the heating element is of a membrane structure or a line structure; when being of the membrane structure, the heating element has a thickness ranging from <NUM> to <NUM>.

In one embodiment, sheet resistance of the second heating portion is less than that of the first heating portion.

In one embodiment, the heating element is divided into a plurality of first heating sections and second heating sections, the first heating sections all extending along a first direction and being spaced in a second direction perpendicular to the first direction; and
lengths of the first heating sections increase along the second direction from a center of the heating element to an edge thereof, and the second heating section is connected between two aligned end portions of two of the first heating sections.

In one embodiment, a spacing between any two adjacent first heating sections is an equal first spacing; and/or a spacing between any two adjacent second heating sections is an equal second spacing.

In one embodiment, the atomization assembly further includes a first pad and a second pad connected at two ends of the heating element, the first pad and the second pad being parallel to each other.

In one embodiment, the heating element is directly attached to the atomizing surface; or the atomizing surface is provided with a groove, and the heating element is partially or wholly received in the groove.

In one embodiment, the substrate is a porous ceramic substrate made of a porous ceramic material.

An electronic atomization device, including the atomization assembly described in any one of the foregoing.

One technical effect of one embodiment of the present application is as follows. Since the heating element includes at least a first heating portion and at least a second heating portion that generate heat differently per unit length and per unit time, the formation of a heat stack region by a local part of the atomizing surface can be prevented, so as to ensure that thermal field distribution of the whole atomization assembly is uniform.

For easy understanding of the present application, a more comprehensive description of the present application is given below with reference to the accompanying drawings. Preferred implementations of the present application are given in the accompanying drawings. However, the present application may be implemented in many different forms and is not limited to the implementations described herein. On the contrary, these implementations are provided to understand the disclosed content of the present application more thoroughly and comprehensively.

It is to be noted that when an element is referred to as being "fixed to" another element, the element may be directly on the other element or an intermediate element may exist. When an element is referred to as being "connected to" another element, the element may be directly connected to the other element or an intermediate element may co-exist. The terms "inner", "outer", "left", "right" and similar expressions used herein are for illustrative purposes only, and do not represent unique implementations.

Referring to <FIG>, <FIG>, an electronic atomization device <NUM> according to an embodiment of the present application includes an atomizer <NUM> and a power source <NUM>. The atomizer <NUM> is provided with a liquid storage chamber and includes an atomization assembly <NUM>. The atomization assembly <NUM> includes a heating element <NUM> and a substrate <NUM>. The substrate <NUM> may be made of a porous ceramic material, so that the substrate <NUM> has a large number of micropores and has a function of buffering and transporting liquid. The substrate <NUM> has a porosity up to <NUM>% to <NUM>%, which may have a specific value of <NUM>%, <NUM>%, <NUM>% or the like. The micropore may have an aperture ranging from <NUM> to <NUM>, which may have a specific value of <NUM>, <NUM>, <NUM> or the like. A liquid aerosol-forming matrix such as oil may be stored in the liquid storage chamber. The substrate <NUM> has an atomizing surface <NUM> and a liquid suction surface <NUM>. The liquid suction surface <NUM> is configured to suck the oil in the liquid storage chamber and introduce the oil into the substrate <NUM>. The oil introduced into the substrate <NUM> further reaches the atomizing surface <NUM>.

The heating element <NUM> is arranged on the atomizing surface <NUM>. For example, the heating element <NUM> may be directly attached to the atomizing surface <NUM> by silk screen printing. That is, the heating element <NUM> protrudes a certain height from the atomizing surface <NUM>. Certainly, a groove may be concavely formed on the atomizing surface <NUM>, the heating element <NUM> is wholly or partially received in the groove, and a heating component has a top surface facing away from the liquid suction surface <NUM>. When the heating element <NUM> is wholly received in the groove, the top surface may be located in the groove and spaced apart from the atomizing surface <NUM>. That is, the top surface is lower than the atomizing surface <NUM>. The top surface may also be flush with the atomizing surface <NUM>. Obviously, when the heating component is partially received in the groove, the top surface may be located outside the groove and spaced apart from the atomizing surface <NUM>. In this case, the top surface is higher than the atomizing surface <NUM>. The arrangement of the heating element <NUM> in the groove can improve strength of a connection between the heating component and the substrate <NUM>, prevent detachment of the heating element <NUM> from the substrate <NUM> due to the warping under a cyclic action of thermal stress, and then prevent the warping part of the heating element <NUM> from dry burning or even fusing due to the failure to soak enough oil.

The power source <NUM> is electrically connected to the heating element <NUM>. When the power source <NUM> supplies power to the heating element <NUM>, the heating element <NUM> can convert electric energy into heat, so that the oil on the atomizing surface <NUM> can absorb heat and rise to an atomization temperature, so as to ensure that the oil may eventually form aerosol for user suction. The liquid suction surface <NUM> may be provided with a sink <NUM>. The sink <NUM> is formed by a part of the liquid suction surface <NUM> recessed a set depth toward the atomizing surface <NUM>. The arrangement of the sink <NUM> can shorten a path from the oil to the atomizing surface <NUM>, reduce on-way resistance generated by the oil flowing into the atomizing surface <NUM> from the liquid storage chamber, and also increase a total area of contact between the substrate <NUM> and the oil, so as to increase a speed of supplying the oil to the atomizing surface <NUM> and prevent dry burning of the atomizing surface <NUM> due to a consumption speed of the oil being greater than the supply speed. Especially for oil with a relatively high viscosity, the arrangement of the sink <NUM> can greatly reduce the on-way resistance during the flow of the oil, so as to ensure that the atomizing surface <NUM> has a reasonable oil supply speed.

In some embodiments, the atomizer <NUM> forms a detachable connection with the power source <NUM>. For example, the atomizer <NUM> can be detachably fixed to the power source <NUM> by magnetic connection, threaded connection or snap-fit connection. Therefore, the atomizer <NUM> may be a disposable consumable, while the power source <NUM> may be recycled multiple times. After the oil in the atomizer <NUM> is completely consumed, the atomizer <NUM> in which the oil has been consumed may be unloaded and discarded from the power source <NUM>, and the new atomizer <NUM> filled with oil is re-mounted on the power source <NUM>. Certainly, in other embodiments, the atomizer <NUM> and the power source <NUM> may also form a non-detachable connection.

In some embodiments, the heating element <NUM> may be of a membrane structure or a line structure. When the heating element <NUM> is of the membrane structure, the heating element <NUM> has a thickness ranging from <NUM> to <NUM>. The thickness may have a specific value of <NUM>, <NUM>, <NUM> or the like. The heating element <NUM> has a reasonable thickness, which may appropriately improve fatigue strength of the heating element <NUM> and prevent fatigue fracture of the heating component under the cyclic action of thermal stress, so as to prolong a service life of the heating element <NUM>. When the atomizing surface <NUM> is a two-dimensional plane, the heating element <NUM> may be of a planar structure. When the atomizing surface <NUM> is a three-dimensional surface, the heating element <NUM> may be of a three-dimensional structure.

Referring to <FIG>, <FIG> and <FIG>, the atomization assembly <NUM> further includes a first pad <NUM> and a second pad <NUM>. The heating element <NUM> is configured to generate heat. The first pad <NUM> and the second pad <NUM> are respectively connected at two ends of the heating element <NUM>. The first pad <NUM> and the second pad <NUM> are respectively electrically connected to positive and negative poles of the power source <NUM>. When the power source <NUM> supplies power to the heating element <NUM> through the first pad <NUM> and the second pad <NUM>, the heating element <NUM> generates heat. An extension path of the heating element <NUM> may be abstracted as a plane curve structure. In other words, the heating element <NUM> may be abstracted as a curve. The curve may be a spiral which may be similar to a rectangular spiral (as shown in <FIG>), an equidistant Archimedes spiral (as shown in <FIG>), a variable-distance asymptotic spiral, an S-shaped spiral, or the like. When the heating element <NUM> is similar to the rectangular spiral, its structure is described as follows.

Referring to <FIG> and <FIG>, the heating element <NUM> is divided into a plurality of first heating sections <NUM> and second heating sections <NUM>. The first heating section <NUM> and the second heating section <NUM> may both be abstracted as a line segment. The plurality of first heating sections <NUM> all extend along a first direction to enable the plurality of first heating sections <NUM> to be parallel to each other. That is, the plurality of first heating sections <NUM> are spaced in a second direction perpendicular to the first direction. When the atomizing surface <NUM> is rectangular, the first direction may be a length direction of the atomizing surface <NUM>, and the second direction is a width direction of the atomizing surface <NUM>. A spacing between two adjacent first heating sections <NUM> is denoted as a first spacing, and the first spacing between any two adjacent first heating sections <NUM> may be equal. Lengths of the first heating sections <NUM> increase along the second direction from a center of the heating element <NUM> to an edge thereof, that is, along a direction from the first heating section <NUM> at the very center to the first heating section <NUM> at the very edge.

Specifically, the first heating section <NUM> at the very center is denoted as a central heating section <NUM>. A group of first heating sections <NUM> is provided on an upper side of the central heating section <NUM>. The group of first heating sections is denoted as a first group <NUM>. A group of first heating sections <NUM> is also provided on a lower side of the central heating section <NUM>. The group of first heating sections is denoted as a second group <NUM>. The first group <NUM> and the second group <NUM> may include a same number of first heating sections <NUM>. For the first group <NUM>, along an arrangement direction from bottom to top, the first heating sections <NUM> are respectively denoted as a first upper heating section 301a, a second upper heating section 301b, a third upper heating section 301c, a fourth upper heating section,. , and an Nth upper heating section. The first upper heating section 301a is closest to the central heating section <NUM>. The second upper heating section 301b is adjacent to the first upper heating section 301a. By analogy, the N-<NUM>th upper heating section is adjacent to the Nth upper heating section, a length of the N-<NUM>th upper heating section is less than that of the Nth upper heating section, and end portions of the N-<NUM>th upper heating section are not aligned with those of the Nth upper heating section. Similarly, referring to the design mode of the first group <NUM>, for the second group <NUM>, along an arrangement direction from top to bottom, the first heating sections <NUM> are respectively denoted as a first lower heating section 302a, a second lower heating section 302b, a third lower heating section 302c, a fourth lower heating section,. , and an Nth lower heating section. The first lower heating section 302a is closest to the central heating section <NUM>. The second lower heating section 302b is adjacent to the first lower heating section 302a. By analogy, the N-<NUM>th lower heating section is adjacent to the Nth lower heating section. A length of the N-<NUM>th lower heating section is less than that of the Nth lower heating section, and end portions of the N-<NUM>th lower heating section are not aligned with those of the Nth lower heating section.

When the first heating sections <NUM> are arranged, firstly, a right end of the first upper heating section 301a is aligned with a right end of the central heating section <NUM>, and a left end of the first lower heating section 302a is aligned with a left end of the central heating section <NUM>; and a length of the first upper heating section 301a is equal to that of the first lower heating section 302a. Secondly, the second upper heating section 301b and the second lower heating section 302b are equal in length, and a right end of the second upper heating section 301b is aligned with a right end of the first lower heating section 302a. A left end of the first upper heating section 301a is aligned with a left end of the second lower heating section 302b. Next, the third upper heating section 301c and the third lower heating section 302c are equal in length, a right end of the third upper heating section 301c is aligned with a right end of the second lower heating section 302b, and a left end of the second upper heating section 301b is aligned with a left end of the third lower heating section 302c. By analogy, the Nth upper heating section and the Nth lower heating section are equal in length, and a right end of an M+<NUM>th upper heating section is aligned with a right end of an Mth lower heating section. A left end of an Mth upper heating section is aligned with a left end of an M+<NUM>th lower heating section.

A plurality of second heating sections <NUM> may be provided. The second heating section <NUM> is connected between two aligned end portions of two first heating sections <NUM>. The second heating sections <NUM> may also be linear to enable the second heating sections <NUM> to extend along the second direction. The second heating sections <NUM> are spaced along the first direction (the length direction of the atomizing surface <NUM>). A spacing between two adjacent second heating sections <NUM> is denoted as a second spacing, and the second spacing between any two adjacent second heating sections <NUM> may be equal. The second spacing may be greater than or equal to the first spacing. For example, the second spacing may be exactly equal to the first spacing. The first spacing and the second spacing may range from <NUM> to <NUM>, and may have a specific value of <NUM>, <NUM>, <NUM>, <NUM> or the like. The first heating section <NUM> and the second heating section <NUM> may also be equal in width. Their widths may range from <NUM> to <NUM>, which may have a specific value of <NUM>, <NUM>, <NUM>, <NUM> or the like.

In some embodiments, for example, referring to <FIG>, three first heating sections <NUM> are provided, and two second heating sections <NUM> are provided. In another example, referring to <FIG>, five first heating sections <NUM> are provided, and four second heating sections <NUM> are provided. In another example, referring to <FIG>, seven first heating sections <NUM> are provided, and six second heating sections <NUM> are provided. In another example, by analogy, 2N+<NUM> first heating sections <NUM> are provided, and 2N second heating sections <NUM> are provided.

The first pad <NUM> is connected to one end of the heating element <NUM>, and the second pad <NUM> is connected to the other end of the heating element <NUM>. That is, the first pad <NUM> and the second pad <NUM> are connected to two opposite ends of the heating element <NUM>. The first pad <NUM> and the second pad <NUM> may both be linear, so that the two are arranged in parallel with the second heating section <NUM>. The first pad <NUM> and the second pad <NUM> may be equal in width, and their widths may both be larger than the width of the second heating section <NUM>. The first pad <NUM> and the second pad <NUM> may have a width ranging from <NUM> to <NUM>. The width may have a specific value of <NUM>, <NUM>, <NUM>, <NUM> or the like. A spacing between the first pad <NUM> and the second heating section <NUM> adjacent thereto may be equal to the second spacing. A spacing between the second pad <NUM> and the second heating section <NUM> adjacent thereto may also be equal to the second spacing. The first pad <NUM> and the second pad <NUM> both have low resistivity and excellent conductivity. The first pad <NUM> and the second pad <NUM> are configured to be electrically connected to the power source <NUM>, so that the power source <NUM> supplies power to the heating element <NUM> through the first pad <NUM> and the second pad <NUM>. The heating element <NUM> is ensured to convert electric energy into heat energy to atomize the oil on the atomizing surface <NUM>.

Referring to <FIG> and <FIG>, the heating element <NUM> includes a plurality of first heating portions <NUM> and second heating portions <NUM>. Sheet resistance of the second heating portion <NUM> is less than that of the first heating portion <NUM>. Heat generated by the first heating portion <NUM> per unit length and per unit time is greater than that generated by the second heating portion <NUM>. The first heating portion <NUM> and the second heating portion <NUM> may form a series circuit, a parallel circuit, or a series-parallel hybrid circuit. For example, when the first heating portion <NUM> and the second heating portion <NUM> form a series circuit, resistivity of the second heating portion <NUM> is less than that of the first heating portion <NUM>, so that the heat generated by the first heating portion <NUM> per unit length and per unit time is greater than that generated by the second heating portion <NUM>. The resistivity of the second heating portion <NUM> ranges from <NUM>Ω•mm to <NUM> mΩ•mm, which may have a specific value of, for example, <NUM>Ω•mm, <NUM>Ω•mm, <NUM>Ω•mm, <NUM>Ω•mm or the like. The second heating portion <NUM> may be made of at least one of gold, silver or copper. The resistivity of the first heating portion <NUM> ranges from <NUM>Ω•mm to <NUM> mΩ•mm, which may have a specific value of, for example, <NUM>Ω•mm, <NUM>Ω•mm, <NUM>Ω•mm, <NUM>Ω•mm or the like. The first heating portion <NUM> may be made of at least one of ruthenium or nickel. Certainly, the first heating portion <NUM> may also include other alkali metal materials. The second heating portion <NUM> is connected between two adjacent first heating portions <NUM>. That is, one end of the second heating portion <NUM> is connected to an end portion of one of the first heating portions <NUM>, and the other end of the second heating portion <NUM> is connected to an end portion of the other of the first heating portions <NUM>. In short, the second heating portions <NUM> and the first heating portions <NUM> are staggered along the entire extension path of the heating element <NUM>. For an orthographic projection of the second heating portion <NUM> along a normal direction of the extension path, the orthographic projection covers at least part of the first heating portion <NUM> adjacent to the second heating portion <NUM> in the normal direction. In other words, for the two adjacent first heating portions <NUM> and the second heating portion <NUM> in the normal direction of the extension path, orthographic projections of the two first heating portions <NUM> and the second heating portion <NUM> in the normal direction overlap at least partially. In other embodiments, for the two adjacent first heating portions <NUM> and the second heating portion <NUM> on the extension path, the orthographic projections of the first heating portions <NUM> and the second heating portion <NUM> in the normal direction may also overlap at least partially. Certainly, the heating element <NUM> may further include a third heating portion. Heat generated by the third heating portion per unit length and per unit time may be between the heat generated by the first heating portion and the heat generated by the second heating portion.

The first heating section <NUM> may include a plurality of second heating portions <NUM> and first heating portions <NUM>. That is, the first heating section <NUM> may be formed by the plurality of second heating portions <NUM> and first heating portions <NUM> simultaneously connected. The second heating section <NUM> may include at least one second heating portion <NUM> or at least one first heating portion <NUM>. In a case where the second heating section <NUM> has a small length, the second heating section <NUM> may be formed by only one second heating portion <NUM> or only one first heating portion <NUM>. In a case where the second heating section <NUM> has a large length, the second heating section <NUM> may also be formed by the plurality of second heating portions <NUM> and first heating portions <NUM> connected.

For the whole heating element <NUM>, the first heating portion <NUM> has the highest resistivity, and the resistivity of the second heating portion <NUM> may be less than or equal to that of the first pad <NUM> and the second pad <NUM>. Therefore, for the whole heating element <NUM>, the first heating portion <NUM>, the second heating portion <NUM>, the first pad <NUM> and the second pad <NUM> are connected to one another to form a series circuit, so that the heat of the heating element <NUM> is almost all generated by the first heating portion <NUM>, while the heat generated by the second heating portion <NUM>, the first pad <NUM> and the second pad <NUM> may be ignored.

Referring to <FIG>, if the whole heating element <NUM> is entirely made of the first heating portion <NUM> with a relatively high resistivity, since the heat generated by the first heating section <NUM> is transferred around along the atomizing surface <NUM>, the farther the atomizing surface <NUM> is from the first heating section <NUM>, the less heat may be received. Therefore, a stack region that can receive more heat from two adjacent first heating sections <NUM> at the same time definitely exists in the atomizing surface <NUM> between the two first heating sections <NUM>, so that the stack region absorbs more heat per unit time to form a first local high-temperature region <NUM>. A temperature of the first local high-temperature region <NUM> may be evidently higher than that of other regions of the atomizing surface <NUM>. As a result, a heating temperature of the oil in the region is much higher than an atomization temperature of the oil, so that the oil may form a burnt taste due to the high heating temperature, which ultimately affects user experience. A part of the heating element <NUM> close to the first local high-temperature region <NUM> is unable to be fully soaked by the oil due to a consumption speed of the oil being greater than the supply speed, resulting in dry burning and even fusing of the part of the heating element <NUM>. Likewise, a local high-temperature region may also be formed on the atomizing surface <NUM> between two adjacent second heating sections <NUM>.

In particular, the atomizing surface <NUM> located at the center of the heating element <NUM>, due to a short length of the second heating section <NUM> connected between the two adjacent first heating sections <NUM>, a region of the atomizing surface <NUM> close to the two first heating sections <NUM> and the second heating section <NUM> at the same time may simultaneously receive heat from the two first heating sections <NUM> and the second heating section <NUM>, so that the stack region absorbs more heat over time to form a second local high-temperature region <NUM>. The temperature of the second local high-temperature region <NUM> may be much higher than that of the first local high-temperature region <NUM>, which also causes the oil in the first local high-temperature region <NUM> to form a burnt taste due to the high heating temperature. At the same time, A part of the heating element <NUM> close to the second local high-temperature region <NUM> may produce dry burning or even fusing. Moreover, the second local high-temperature region <NUM> is obviously close to a junction between the first heating section <NUM> and the second heating section <NUM>. Under relatively high thermal stress, stress concentration may be formed at the junction between the first heating section <NUM> and the second heating section <NUM> to lead to detachment from the substrate <NUM>, so that the part of the heating element <NUM> detached from the substrate <NUM> is more difficult to be soaked by the oil to produce dry burning or fusing. Certainly, for other regions of the atomizing surface <NUM>, a local high-temperature region may also be formed at a junction between any two first heating sections <NUM> and a second heating section <NUM>.

For the heating element <NUM> in the above embodiment, the orthographic projection of the second heating portion <NUM> along the normal direction of the extension path covers at least part of the first heating portion <NUM> adjacent to the second heating portion <NUM> in the normal direction. Therefore, for the two adjacent first heating sections <NUM>, the first heating portion <NUM> on one first heating section <NUM> may be arranged opposite to the second heating portion <NUM> of the other first heating section <NUM>. Since the heat generated by the second heating portion <NUM> may be ignored, almost all the heat on the atomizing surface <NUM> between the first heating portion <NUM> and the second heating portion <NUM> comes from the first heating portion <NUM> on the one first heating section <NUM>, which prevents the formation of a stack region by the part of the atomizing surface <NUM> by receiving the heat from the first heating portions <NUM> on the first heating section <NUM> and the second heating section <NUM> at the same time. Similarly, the atomizing surface <NUM> between two adjacent second heating sections <NUM> cannot form a heat stack region to ensure that heat field distribution of the whole heating element <NUM> is uniform, so that heat and temperatures on the entire atomizing surface <NUM> are distributed uniformly, thereby preventing the formation of a local high temperature by the atomizing surface <NUM> and preventing a burned taste generated by the oil due to a too high temperature, and the oil on the atomizing surface <NUM> is atomized to form aerosols with uniform particles, thereby improving the user experience. At the same time, this also prevents dry burning or even fusing produced by the heating element <NUM> due to a local high temperature and prevents the influence on human health due to toxic gas generated from dry burning, thereby improving the use safety and prolonging the service life of the heating element <NUM>.

The technical features in the above embodiments may be randomly combined. For concise description, not all possible combinations of the technical features in the above embodiments are described. However, all the combinations of the technical features are to be considered as falling within the scope described in this specification provided that they do not conflict with each other.

Claim 1:
An atomization assembly (<NUM>) comprising:
a substrate (<NUM>) comprising an atomizing surface (<NUM>) configured to atomize an aerosol-forming matrix to form aerosol; and
a heating element (<NUM>) to heat the atomizing surface (<NUM>), the heating element (<NUM>) being connectable to a power source (<NUM>), the heating element (<NUM>) being directly or indirectly arranged on the atomizing surface (<NUM>); characterized in that
the heating element (<NUM>) comprises at least a first heating portion (<NUM>) and at least a second heating portion (<NUM>), wherein the first heating portion (<NUM>) and the second heating portion (<NUM>) are configured to generate heat differently per unit length and per unit time.