CN217009335U - Heating film and battery pack - Google Patents

Abstract

The utility model relates to the technical field of batteries, and provides a heating film and a battery pack. The heating film includes: the battery pack comprises a first heating area, a second heating area and a third heating area which are sequentially arranged, wherein the arrangement direction of the first heating area, the second heating area and the third heating area is parallel to the arrangement direction of a first side wall and a second side wall which have temperature difference in the battery pack, and the first side wall and the second side wall are oppositely arranged; the power density of the first heating area and the power density of the third heating area are both larger than the power density of the second heating area, and the power density of the first heating area is not equal to the power density of the third heating area. The application provides a heating film accessible is close to the first zone of heating of first lateral wall and is close to the third zone of heating of second lateral wall and carries out selective heating to battery unit to make the battery unit be close to the part of first lateral wall and the battery unit is close to the part of second lateral wall and obtains corresponding heat compensation through heating the film, thereby the temperature homogeneity of guarantee battery unit everywhere.

Description

Heating film and battery pack

Technical Field

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

Background

The charging and discharging performance of the conventional power battery can be obviously reduced in a low-temperature environment, and when the temperature is lower in winter, the temperature of the battery is often reduced quickly after an automobile provided with the power battery pack is kept still outdoors for a whole night, so that the automobile cannot be started immediately, the battery needs to be heated first, and the available electric quantity is reduced during running. Therefore, the heat preservation treatment of the power battery pack is very important.

When the battery pack is placed still in a low-temperature environment, the battery units close to the periphery of the battery pack are cooled quickly, and the battery units close to the inside of the battery pack are cooled slowly, so that the temperature difference between the battery units at the inner position and the outer position is large, and the consistency and the service life of batteries in the battery units are influenced.

The heat preservation scheme of present battery package is mainly at battery package inside or outside installation insulation material, but all is difficult to solve the battery package low temperature and stews the big problem of inside and outside difference in temperature.

SUMMERY OF THE UTILITY MODEL

The utility model provides a heating film and a battery pack, which are used for flexibly heating the battery packs at different positions, prolonging the service life of the battery and ensuring the consistency of the battery.

In order to achieve the purpose, the utility model provides the following technical scheme:

according to a first aspect of the present invention, there is provided a heating film comprising:

the first zone of heating, the second zone of heating and the third zone of heating that arrange in proper order, the array orientation of the first zone of heating, the second zone of heating and the third zone of heating be used for with the battery package in have the array orientation of the first side wall and the second side wall of difference in temperature parallel, just the first side wall with the second side wall sets up relatively, wherein:

the power density of the first heating area and the power density of the third heating area are both larger than the power density of the second heating area, and the power density of the first heating area is not equal to the power density of the third heating area.

In the heating film that this application provided, the heating film includes first zone of heating, the second zone of heating and third zone of heating, wherein, the power density of first zone of heating and third zone of heating all is greater than the power density of the second zone of heating, and the power density of the first zone of heating is unequal with the power density of the third zone of heating. When using the heating film that this application provided, first zone of heating, second zone of heating and third zone of heating arrange in proper order, and this array orientation is parallel with the array orientation of the first lateral wall that has the difference in temperature in the battery package and second lateral wall. Specifically, the first side wall and the second side wall are arranged oppositely, and along the arrangement direction of the first side wall and the second side wall, the parts of the battery unit located at two sides can dissipate more heat than the middle part, so that the power density of the first heating area and the power density of the third heating area are both larger than that of the second heating area, so that all parts of the battery unit can be flexibly heated, and the heating amount of the heating film on two sides of the battery is larger than that of the middle part of the battery unit. Meanwhile, the first side wall and the second side wall of the battery pack have temperature difference, so that the battery unit arranged in the battery pack has different heat dissipation conditions at the part close to the first side wall and the part close to the second side wall.

According to a second aspect of the present invention, there is provided a battery pack, comprising an annular frame and a partition, wherein the partition divides a space in the annular frame into at least two chambers, each chamber comprises a first side wall and a second side wall which are oppositely arranged, and a temperature difference exists between the first side wall and the second side wall;

still include the heating film that provides as in above arbitrary technical scheme, the heating film is arranged in the cavity, and along the arrangement direction of first lateral wall with the second lateral wall, first zone of heating is close to the first lateral wall, the third zone of heating is close to the second lateral wall.

In the battery pack provided by the application, the battery pack comprises an annular frame and a partition, wherein the partition divides the annular frame into at least two chambers, the chambers comprise a first side wall and a second side wall which are oppositely arranged, and the heating film is arranged in the chambers. When using the battery package that this application provided, the first zone of heating, the second zone of heating and the third zone of heating film arrange in proper order, and this array orientation is parallel with the array orientation of the first lateral wall that has the difference in temperature in the battery package and second lateral wall. Specifically, the first side wall and the second side wall are arranged oppositely, and along the arrangement direction of the first side wall and the second side wall, the parts of the battery unit located at two sides can dissipate more heat than the middle part, so that the power density of the first heating area and the power density of the third heating area are both larger than that of the second heating area, so that all parts of the battery unit can be flexibly heated, and the heating amount of the heating film on two sides of the battery unit is larger than that of the middle part of the battery unit. Meanwhile, the first side wall and the second side wall of the battery pack have temperature difference, so that the battery unit arranged in the battery pack has different heat dissipation conditions at the part close to the first side wall and the part close to the second side wall.

Drawings

For a better understanding of the present disclosure, 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 so as to emphasize and clearly illustrate the technical features of the present disclosure. In addition, the relevant elements or components may be arranged differently as is known in the art. Further, in the drawings, like reference characters designate the same or similar parts throughout the several views. Wherein:

fig. 1 is a schematic diagram of a structure of a battery pack provided in an embodiment of the present application;

fig. 2 is a schematic structural diagram of a battery pack according to an embodiment of the present disclosure;

fig. 3 is a schematic diagram of another structure of a ring-shaped frame and a separator in a battery pack according to an embodiment of the present disclosure;

fig. 4 is an exploded view of the structure of fig. 2.

The reference numerals are explained below:

100. heating the film; 110. a first heating zone; 120. a second heating zone; 130. a third heating zone; 200. a box body; 210. an annular rim; 220. a separator; 221. a cross beam; 222. a stringer; 230. a cover plate; 240. a base plate; 250. a liquid-cooled plate; 300. a battery cell; 310. a battery; 400. a heat insulating pad.

Detailed Description

The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the exemplary embodiments of the present disclosure. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, 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 disclosure.

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

The terms "connected," "secured," and the like are to be construed broadly and encompass, for example, a fixed connection, a removable connection, an integral connection, an electrical connection, or a signal connection; "connected" may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present disclosure can be understood by those skilled in the art as the case may be.

Further, in the description of the present disclosure, it is to be understood that the directional words "upper", "lower", "inner", "outer", etc., which are described in the exemplary embodiments of the present disclosure, are described at the angles shown in the drawings, and should not be construed as limiting the exemplary embodiments of the present disclosure. It will also be understood that, in this context, when an element or feature is referred to as being "on", "under", or "inner", "outer" with respect to another element(s), it can be directly on "," under ", or" inner "," outer "with respect to the other element(s), or indirectly on", "under", or "inner", "outer" with respect to the other element(s) via intervening elements.

In a first aspect, embodiments of the present application provide a heating film 100. Fig. 1 is a schematic structural view illustrating a heating film 100 applied to a battery pack according to an embodiment of the present disclosure. As shown in fig. 1, the heating film 100 includes: the first heating area 110, the second heating area 120 and the third heating area 130 are arranged in sequence, the arrangement direction of the first heating area 110, the second heating area 120 and the third heating area 130 is used for being parallel to the arrangement direction of the first side wall S1 and the second side wall S2 with temperature difference in the battery pack, the first side wall S1 and the second side wall S2 are oppositely arranged, wherein:

the watt density of the first heating zone 110 and the watt density of the third heating zone 130 are both greater than the watt density of the second heating zone 120, and the watt density of the first heating zone 110 is not equal to the watt density of the third heating zone 130.

Because the heat dissipation rates of different regions of the battery unit 300 are different, in order to ensure the temperature uniformity of the battery unit 300 attached with the heating film 100, the power density of each region in the heating film 100 can be set according to actual needs, specifically, the power density can be divided into different regions to match different requirements of each part of the battery unit 300 in the battery pack for temperature rise. In applying the heating film 100 provided in the present application, the first heating region 110, the second heating region 120, and the third heating region 130 are sequentially arranged, exemplarily arranged along the first direction in fig. 1, and it is noted that the first direction is also parallel to the arrangement direction of the first side wall S1 and the second side wall S2 having a temperature difference inside the battery pack.

Specifically, the first side wall S1 and the second side wall S2 are disposed opposite to each other, and along the arrangement direction of the first side wall S1 and the second side wall S2, the portions of the battery cell 300 located at both sides may dissipate more heat than the middle portion, so that the power density of the first heating region 110 and the third heating region 130 is greater than that of the second heating region 120 to flexibly heat each portion of the battery cell 310, so that the heating amount of the heating film 100 on both sides of the battery cell 300 is greater than that of the middle portion of the battery cell 300.

Meanwhile, since the first side wall S1 and the second side wall S2 of the battery pack have a temperature difference, the battery unit 300 placed in the battery pack may have different heat dissipation conditions at a portion close to the first side wall S1 and a portion close to the second side wall S2, and based on this, the battery unit 300 may be selectively heated by the first heating region 110 close to the first side wall S1 and the third heating region 130 close to the second side wall S2, so that the portion of the battery unit 300 close to the first side wall S1 and the portion of the battery unit 300 close to the second side wall S2 are compensated by the heating film 100, and thus, the temperature uniformity of the battery unit 300 is ensured at all places.

It should be noted that the heating film 100 may compensate for the temperature of the battery pack, and specifically, may heat the battery pack flexibly at different locations, which may extend the life of the batteries 310 in the battery pack and ensure the consistency of the batteries 310. Meanwhile, the electric power of the heating film 100 is small, and an energy-saving effect can be achieved.

In the specific configuration of the heating film 100, the watt density of the first heating region 110 may be set to be greater than that of the third heating region 130, or the watt density of the first heating region 110 may be set to be less than that of the third heating region 130, which is specifically required to be set according to the environments of the first side wall S1 and the second side wall S2. For example, when the temperature of the first side wall S1 is lower than that of the second side wall S2, the battery cell 300 may lose more heat at the side close to the first side wall S1, and the power density of the first heating region 110 needs to be set to be greater than that of the third heating region 130. Of course, when the temperature of the first sidewall S1 is lower than the temperature of the second sidewall S2, the reverse setting is required, and detailed description thereof is omitted.

In one embodiment, with continued reference to the structure shown in fig. 1, the first heater zone 110, the second heater zone 120, and the third heater zone 130 are integrally formed and connected to each other.

It should be noted that, when the first heating region 110, the second heating region 120 and the third heating region 130 are integrally formed, the installation operation of the heating film 100 in the battery pack is facilitated, and the subsequent temperature control of the heating film 100 is facilitated.

Of course, any two of the first heating area 110, the second heating area 120, and the third heating area 130 may also be provided as an integrally formed structure, or the first heating area 110, the second heating area 120, and the third heating area 130 may be provided as separate structures, which may be specifically provided as required and will not be described herein again.

In one embodiment, the heating film 100 includes a film body and a resistance wire disposed on the film body.

It is noted that the density of the resistive wire arrangement and the diameter of the resistive wire can affect the power density of the heating film 100. Specifically, in the heating film 100 in which the resistance wires are arranged at the same density, the smaller the diameter of the resistance wire is, the more heat is generated; the heating film 100 with the same diameter of the resistance wire generates more heat as the distribution density of the resistance wire is higher.

Based on the above principle, when the power densities of the first heating region 110, the second heating region 120, and the third heating region 130 in the heating film 100 are specifically adjusted, the following arrangement may be made.

In a specific embodiment, the arrangement density of the resistance wires in the first heating region 110 and the arrangement density of the resistance wires in the third heating region 130 are both greater than the arrangement density of the resistance wires in the second heating region 120, and the arrangement density of the resistance wires in the first heating region 110 is different from the arrangement density of the resistance wires in the third heating region 130.

It should be noted that in this specific embodiment, the diameters of the resistance wires in the first heating region 110, the second heating region 120, and the third heating region 130 are the same, and the power density of the heating regions can be adjusted only by adjusting the arrangement density of the resistance wires. It should be appreciated that this single variable adjustment may facilitate the arrangement of the resistive wire structure within the heating film 100 depending on the power density required for the heating zone.

In another specific embodiment, the diameter of the resistance wire in the first heating region 110 and the diameter of the resistance wire in the third heating region 130 are both smaller than the diameter of the resistance wire in the second heating region 120, and the diameter of the resistance wire in the first heating region 110 is different from the diameter of the resistance wire in the third heating region 130.

In this specific embodiment, the resistance wires in the first heating region 110, the second heating region 120 and the third heating region 130 have the same arrangement density, and the power density of the heating regions can be adjusted only by adjusting the diameter of the resistance wires. It should be appreciated that this single variable adjustment may facilitate the selection of the diameter of the resistance wire inside the heating film 100 based on the power density required for the heating zone.

Of course, the diameter of the resistance wires and the arrangement density of the resistance wires can be adjusted at the same time, so as to adjust the heating effect of the heating film 100 to the optimum state.

Exemplarily, setting: the arrangement density of the resistance wires in the first heating area 110 and the arrangement density of the resistance wires in the third heating area 130 are both greater than the arrangement density of the resistance wires in the second heating area 120, and the arrangement density of the resistance wires in the first heating area 110 is different from the arrangement density of the resistance wires in the third heating area 130; meanwhile, the diameter of the resistance wire in the first heating region 110 and the diameter of the resistance wire in the third heating region 130 are both smaller than the diameter of the resistance wire in the second heating region 120, and the diameter of the resistance wire in the first heating region 110 is different from the diameter of the resistance wire in the third heating region 130.

In a second aspect, embodiments of the present application provide a battery pack. Fig. 1 is a schematic structural diagram of a battery pack provided in an embodiment of the present application, and fig. 2 is a schematic structural diagram of a battery pack provided in an embodiment of the present application. As shown in fig. 1 and 2, the battery pack includes a case 200, the case 200 specifically includes an annular frame 210 and a partition 220, the partition 220 divides the space in the annular frame 210 into at least two chambers, each chamber includes a first side wall S1 and a second side wall S2, which are oppositely arranged, and a temperature difference exists between the first side wall S1 and the second side wall S2;

the heating film 100 is disposed in the chamber, and along the arrangement direction of the first side wall S1 and the second side wall S2, the first heating area 110 is close to the first side wall S1, and the third heating area 130 is close to the second side wall S2.

It should be noted that, in the battery pack provided in the embodiment of the present application, the partition 220 divides the annular frame 210 into at least two chambers, each of the chambers includes a first side wall S1 and a second side wall S2, which are oppositely disposed, and the heating film 100 is disposed inside the chamber. Illustratively, as shown in fig. 2, the divider 220 includes a cross beam 221 extending in the second direction and a longitudinal beam 222 extending in the first direction.

When the battery pack provided by the present application is used, the first heating section 110, the second heating section 120, and the third heating section 130 of the heating film 100 are sequentially arranged, and the arrangement direction is parallel to the arrangement direction of the first side wall S1 and the second side wall S2 having a temperature difference in the battery pack.

Specifically, the first side wall S1 and the second side wall S2 are disposed opposite to each other, and along the arrangement direction of the first side wall S1 and the second side wall S2, the portions of the battery 310 located at both sides may dissipate more heat than the middle portion, so that the power density of the first heating region 110 and the power density of the third heating region 130 are both greater than the power density of the second heating region 120 to flexibly heat each portion of the battery unit 300, so that the heating amount of the heating film 100 on both sides of the battery unit 300 is greater than the heating amount on the middle portion of the battery unit 300. Meanwhile, since the first side wall S1 and the second side wall S2 of the battery pack have a temperature difference, the battery unit 300 placed in the battery pack may have different heat dissipation conditions at the portion close to the first side wall S1 and the portion close to the second side wall S2, and based on this, the battery unit 300 may be selectively heated by the first heating region 110 close to the first side wall S1 and the third heating region 130 close to the second side wall S2, so that the portion of the battery unit 300 close to the first side wall S1 and the portion of the battery unit 300 close to the second side wall S2 are compensated for heat by the heating film 100, thereby ensuring the temperature uniformity of the battery unit 300 at all places.

In one embodiment, the length of the first heating zone 110 is 1/5-1/2 of the length of the second heating zone 120 along the arrangement direction of the first heating zone 110, the second heating zone 120 and the third heating zone 130.

It should be noted that, because the heat dissipation rates of the first heating region 110 and the second heating region 120 are different, the length of the first heating region 110 may be 1/5 to 1/2 of the length of the second heating region 120, so as to match the heat loss of the battery cell 300 at different portions for heating.

Illustratively, the length of the first heater zone 110 may be selected to be 1/5, 1/4, 1/3, or 1/2 of the length of the second heater zone 120.

Similarly, since the heat dissipation rates of the first heating region 110 and the second heating region 120 are different, the watt density of the first heating region 110 may be set to be greater than that of the second heating region 120, so as to match the heat loss of the battery unit 300 at different portions to perform heating.

In one embodiment, the ratio of the watt density of the first heater zone 110 to the watt density of the second heater zone 120 is: 2:1 to 3: 1.

It is noted that the length of the first heating zone 110 may be the same as or different from the length of the third heating zone 130, and likewise, the watt density of the first heating zone 110 may be the same as or different from the watt density of the third heating zone 130. In one embodiment, annular bezel 210 forms first sidewall S1 and divider 220 forms second sidewall S2.

It should be noted that, as shown in fig. 1, when the annular frame 210 forms the first sidewall S1 and the partition 220 forms the second sidewall S2, the amount of heat loss of the portion of the battery cell 300 close to the first sidewall S1 is relatively large, and the amount of heat loss of the portion of the battery cell 300 close to the second sidewall S2 is relatively small, and therefore, the power density of the first heating region 110 needs to be greater than that of the third heating region 130 to effectively compensate for the heat loss of the battery cell 300.

It is noted that, since the third heating zone 130 is close to the partition 220, the total heat required for the resistance wire in the third heating zone 130 is lower and the power density is lower than that of the first heating zone 110 close to the annular frame 210. According to the embodiment of the application, the heating power in different heating areas can be flexibly controlled, and different heating requirements of different parts of the battery unit 300 can be matched, so that the temperature consistency of each battery 310 in the battery unit 300 can be kept, and the cycle and the service life of the battery 310 are prevented from being influenced by excessive temperature difference.

Of course, the first and second sidewalls S1 and S2 may also be formed by the partition 220. Specifically, as shown in fig. 3, the first side wall S1 and the second side wall S2 of the middle chamber are both formed by the partition 220, but due to the structure in the chambers at both sides, a temperature difference is formed between the first side wall S1 and the second side wall S2. Based on this, the heating film 100 provided in the embodiment of the present application may also be disposed in the middle chamber to flexibly heat the battery cell 300.

Similarly, the first sidewall S1 and the second sidewall S2 may also be formed by the annular frame 210 only, and only the first sidewall S1 and the second sidewall S2 need to have a temperature difference, which is not described in detail.

In one embodiment, further comprises a battery unit 300, the battery unit 300 being formed by stacking a plurality of batteries 310;

the heating film 100 is provided at least on one side of the battery cell 300.

It should be noted that in the battery pack provided in the embodiment of the present application, the internal space of the battery pack is divided by the partition 220 into at least two cavities, and the battery unit 300 can be placed in each cavity. Specifically, one or more battery cells 300 may be placed within each cavity. Illustratively, as shown in fig. 1, one battery cell 300 is disposed in each cavity, and the battery cell 300 includes a plurality of batteries 310.

With continued reference to the structure shown in fig. 1, each battery unit 300 includes a plurality of batteries 310, the stacking direction of the plurality of batteries 310 is parallel to the arrangement direction of the first side wall S1 and the second side wall S2, and the heating film 100 is disposed on the stacking side of the plurality of batteries 310. Illustratively, the arrangement direction of the first and second sidewalls S1 and S2 is the same as the stacking direction of the plurality of cells 310, both along the first direction.

In one embodiment, one side of the battery cell 300 is provided with one heating film 100; in one embodiment, the heating films 100 are disposed on both sides of the battery cell 300 in the stacking direction, and the two heating films 100 are oppositely disposed, and, for example, the heating films 100 are disposed on both sides of the battery cell 300 in a second direction perpendicular to the first direction. Of course, when the temperature difference is also present between the two sidewalls of the chamber except for the first sidewall S1 and the second sidewall S2, the heating films 100 may be disposed on the four sides of the battery cell 300, and may be disposed according to the requirement, which is not described herein again.

It should be noted that, with continued reference to the structure shown in fig. 1 and fig. 2, when the heating film 100 is disposed inside the battery pack, as shown in fig. 1, the heating film 100 may be attached to the surface of the battery cell 300 to better heat the battery cell 300, so as to prevent the relative displacement between the battery cell 300 and the heating film 100. Of course, the heating film 100 may also be disposed between the battery cell 300 and the annular frame 210 or the separation beam, or the heating film 100 may be attached to the annular frame 210 or the separation beam facing the side of the battery cell 300 that needs to be heated.

Of course, when the size of the battery 310 in the battery unit 300 is large, there may be a case where the large face of the battery 310 extends in the first direction. It should be understood that when the battery 310 in the battery unit 300 is a prismatic battery 310, the battery 310 has six sides, wherein "large sides" refers to two sides having a large area relative to the other four sides. In the specific arrangement of the heating films 100, the heating film 100 is disposed on the side of the battery 310, which faces away from the other batteries 310, of the battery unit 300, where the battery 310 is located at the most peripheral position, and specifically, in the second direction, one heating film 100 or two heating films 100 arranged oppositely may be disposed on the battery unit 300.

In addition, it is noted that, when a plurality of battery cells 300 are provided in each chamber, the plurality of battery cells 300 may be arranged in a direction perpendicular to the arrangement direction of the first and second sidewalls S1 and S2.

Illustratively, as shown in fig. 2, two battery cells 300 are provided in each chamber, and the two battery cells 300 are arranged in the second direction, and the plurality of batteries 310 in each battery cell 300 are stacked in the first direction.

In particular, when the heating film 100 is provided, it is possible to provide: the battery cell 300 in each chamber is provided with the heating films 100 on opposite sides in the second direction. Of course, only one side of each battery cell 300 may be provided with the heating film 100, and detailed description thereof is omitted.

In a specific embodiment, the heating films 100 are disposed on opposite sides of the battery cell 300, and in the heating film 100 on each side of the battery cell 300, the arrangement direction of the first heating region 110, the second heating region 120, and the third heating region 130 is parallel to the stacking direction of the plurality of cells 310 in the battery cell 300.

It should be noted that, the battery cell 300 may be selectively heated by the first heating region 110 near the first sidewall S1 and the third heating region 130 near the second sidewall S2, so that the portion of the battery cell 300 near the first sidewall S1 and the portion of the battery cell 300 near the second sidewall S2 are correspondingly thermally compensated by the heating film 100, thereby ensuring the temperature uniformity of the battery cell 300.

In one embodiment, the battery pack provided in the embodiment of the present application further includes a heat insulation pad 400, the heat insulation pad 400 is disposed between the battery 310 and the battery 310 in the battery unit 300 to separate the battery unit 300 into a first sub-unit, a second sub-unit and a third sub-unit, wherein:

the first sub-unit corresponds to the first heating zone 110;

the second sub-unit corresponds to the second heating zone 120;

the third sub-unit corresponds to the third heating zone 130.

It should be noted that, in the battery pack provided in the embodiment of the present application, the heat insulation pad 400 separates the batteries 310 corresponding to different heating areas in the battery unit 300, so as to ensure that the heating film 100 can effectively heat the corresponding portion of the batteries 310, and avoid that the heat is erroneously conducted between the corresponding different portions of the batteries 310, so as to affect the safety performance of the batteries 310.

For example, assuming that 9 cells 310 are included in each cell unit 300 and 9 cells 310 are stacked in the first direction, one heat insulation pad 400 may be disposed between the 2 nd and 3 rd cells 310 such that the first 2 cells 310 correspond to the first heating region 110, and similarly, one heat insulation pad 400 may be disposed between the 6 th cell 310 and the 7 th cell 310 such that the 3 rd to 6 th cells 310 correspond to the second heating region 120 and the last 3 cells 310 correspond to the third heating region 130.

It should be noted that the battery 310 in the battery unit 300 is not limited to be divided by the heat insulating mat 400. Illustratively, the first heater zone 110 may correspond to the cells 310 numbered 1-2, the second heater zone 120 may correspond to the cells 310 numbered 3-7, and the third heater zone 130 may correspond to the cells 310 numbered 8 and 9. Of course, the number of the corresponding cells 310 in the first heating region 110 and the third heating region 130 may be equal to each other, and will not be described herein again.

In one embodiment, as shown in fig. 4, the battery pack provided by the embodiment of the present application further includes a cover plate 230 and a bottom plate 240, and the cover plate 230 is disposed opposite to the bottom plate 240 to seal two side openings of the annular frame 210.

In one embodiment, the cover plate 230 is provided with a heat insulation structure on a side facing the annular frame 210; and/or the presence of a gas in the gas,

a heat insulation structure is arranged on one side of the bottom plate 240 facing the annular frame 210; and/or the presence of a gas in the gas,

the inner wall of the annular frame 210 is provided with a heat insulation structure.

In a specific embodiment, an insulation structure may be disposed on the inner walls of the cover plate 230, the bottom plate 240 and the annular frame 210 to assist in insulating the battery pack.

Particularly, the combination of passive heat preservation (installation of heat preservation materials) and active heat preservation (sticking of the heating film 100 for temperature compensation) is carried out on the battery pack at low temperature, so that the temperature uniformity of the battery 310 in the battery pack can be ensured on the premise that the heating film 100 has low energy consumption, and the requirements that the power battery 310 automobile can be started and the running electric quantity is sufficient after being placed at low temperature for a long time can be met.

Of course, the heat insulation structure can be arranged on the outer side of the battery pack according to requirements, and the heat insulation structure can be specifically arranged according to requirements, so that the heat insulation structure is not repeated.

In one embodiment, a liquid cooling plate 250 is disposed between the bottom plate 240 and the annular frame 210, and the liquid cooling plate 250 is disposed with a heat conducting adhesive at a portion corresponding to the cavity to flexibly dissipate heat of the battery unit 300 in the cavity.

In one embodiment, an insulating plate is disposed between the liquid cooling plate 250 and the partition 220.

It should be noted that the provision of the heat insulating plate between the partition 220 and the liquid cooling plate 250 can reduce unnecessary heat dissipation of the battery pack. Specifically, heat dissipation along the following paths can be reduced: battery cell 300, heat-conducting glue, liquid cold plate 250, separator 220, annular frame 210 inside wall, external environment.

In one embodiment, the battery cells 300 in the battery pack cooperate with end plates to form a battery 310 module.

Specifically, the battery unit 300 formed of the plurality of batteries 310 is fixed by end plates and side plates to form a battery 310 module. Certainly, the battery pack may not be provided with a side plate structure, and details are not repeated.

The battery in the battery unit 300 includes a cell and an electrolyte, and is the smallest unit capable of performing an electrochemical reaction such as charging/discharging. The battery cell refers to a unit formed by winding or laminating a stack 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. Wherein the polarities of the first and second electrodes may be interchanged.

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

Claims (11)

1. A heating film (100), comprising: the first heating district (110), second heating district (120) and third heating district (130) that arrange in proper order, the array orientation of first heating district (110), second heating district (120) and third heating district (130) is used for with the battery package in have the array orientation of the first lateral wall and the second lateral wall of difference in temperature parallel, just first lateral wall with the second lateral wall sets up relatively, wherein:

the power density of the first heating area (110) and the power density of the third heating area (130) are both larger than the power density of the second heating area (120), and the power density of the first heating area (110) is not equal to the power density of the third heating area (130).

2. The heating film (100) according to claim 1, wherein the first heating zone (110), the second heating zone (120) and the third heating zone (130) are integrally formed and interconnected.

3. A heating film (100) according to claim 1, wherein the heating film (100) comprises a film body and a resistance wire provided to the film body, wherein:

the arrangement density of the resistance wires in the first heating area (110) and the arrangement density of the resistance wires in the third heating area (130) are both greater than the arrangement density of the resistance wires in the second heating area (120), and the arrangement density of the resistance wires in the first heating area (110) is different from the arrangement density of the resistance wires in the third heating area (130); and/or the presence of a gas in the gas,

the diameter of the resistance wire in the first heating area (110) and the diameter of the resistance wire in the third heating area (130) are both smaller than the diameter of the resistance wire in the second heating area (120), and the diameter of the resistance wire in the first heating area (110) is different from the diameter of the resistance wire in the third heating area (130).

4. A battery pack, comprising an annular frame and a partition (220), wherein the partition (220) divides the annular frame into at least two chambers, each chamber comprises a first side wall and a second side wall which are oppositely arranged, and a temperature difference exists between the first side wall and the second side wall;

further comprising a heater film (100) according to any of the claims 1-3, said heater film (100) being disposed within said chamber and said first heater zone (110) being adjacent to said first sidewall and said third heater zone (130) being adjacent to said second sidewall along the alignment of said first sidewall and said second sidewall.

5. The battery pack according to claim 4, wherein the length of the first heating region (110) is 1/5-1/2 of the length of the second heating region (120) along the arrangement direction of the first heating region (110), the second heating region (120), and the third heating region (130).

6. The battery pack according to claim 4, wherein the ratio of the power density of the first heating region (110) to the power density of the second heating region (120) is: 2:1 to 3: 1.

7. A battery pack according to any of claims 4-6, wherein the annular rim forms the first side wall and the partition (220) forms the second side wall, the power density of the first heating zone (110) being greater than the power density of the third heating zone (130).

8. The battery pack according to claim 7, further comprising a battery unit (300), the battery unit (300) being formed by stacking a plurality of batteries (310);

the heating film (100) is provided at least on one side of the battery cell (300).

9. The battery pack according to claim 8, wherein the heating films (100) are provided to opposite sides of the battery cell (300), and in the heating films (100) of each side of the battery cell (300),

the arrangement direction of the first heating region (110), the second heating region (120), and the third heating region (130) is parallel to the stacking direction of a plurality of cells (310) within the battery unit (300).

10. The battery pack of claim 9, further comprising a thermal insulation pad (400), wherein the thermal insulation pad (400) is disposed between the battery (310) and the battery (310) in the battery unit (300) to separate the battery unit (300) into a first sub-unit, a second sub-unit, and a third sub-unit, wherein:

the first sub-unit corresponds to the first heating zone (110);

the second sub-unit corresponds to the second heating zone (120);

the third sub-unit corresponds to the third heating zone (130).

11. The battery pack according to any one of claims 4 to 6, further comprising a cover plate (230) and a base plate (240), the cover plate (230) being disposed opposite to the base plate (240) to seal both side openings of the annular rim (210), wherein:

a heat insulation structure is arranged on one side, facing the annular frame (210), of the cover plate (230); and/or a heat insulation structure is arranged on one side, facing the annular frame (210), of the bottom plate (240); and/or the inner wall of the annular frame (210) is provided with a heat insulation structure.

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