CN220731640U - Uniform temperature double-layer battery module - Google Patents

Abstract

The utility model provides a uniform-temperature double-layer battery module, which comprises a plurality of batteries, end plates and a bracket, wherein the batteries which are sequentially arranged on an upper layer and a lower layer form a battery pack, two ends of the battery pack are fixed through the end plates, and the battery pack is arranged on the bracket; and a phase change material sheet disposed on four surfaces of each cell, the four surfaces being adjacent to the surfaces of the electrodes of the cells. According to the battery module, the phase change material sheets are adopted to cover the periphery of the battery, so that the temperature difference of the battery is reduced; in addition, in the use process of the battery module, the temperature is controlled by utilizing the characteristics of the phase change material, the power consumption is avoided, the phase change material has flame retardance and insulating property, and the problem of insulating property is avoided.

Description

Uniform temperature double-layer battery module

Technical Field

The utility model mainly relates to the technical field of battery modules, in particular to a uniform-temperature double-layer battery module.

Background

With the release of the national double-carbon strategy, the development of the power and energy storage industry is accelerated, and the development of lithium battery automobiles and lithium battery energy storage is advanced. The battery pack and the battery module are used as a packaging technology, which is a key technology in the field of lithium batteries. Because lithium batteries are very sensitive to temperature, the attenuation of the batteries is aggravated when the temperature is too high and too low, and the lithium batteries generate heat during the charge-discharge cycle, thereby causing temperature variation and temperature unevenness of the batteries. Controlling the working environment temperature of a lithium battery is a very important ring in the use of the lithium battery, and usually adopts two modes, namely, liquid cooling is used in one mode, and the mode is mainly applied to EV (Electric Vehicle) and energy storage industries; another way is air-cooled cooling, which is mainly used in the energy storage industry.

The manner of using liquid-cooled cooling has the following disadvantages: firstly, a large amount of liquid leakage problems can be caused, and particularly, after vibration transportation, a large risk is brought to the insulating performance of the product, and the overall safety performance of the product is influenced; secondly, the weight of the battery module is increased, and the requirement of light weight is not met; thirdly, the equipment has larger power consumption and serious electric energy waste in the using process.

The manner of using air-cooled cooling suffers from the following disadvantages: firstly, the air cooling can cause larger temperature difference between different batteries and different parts of the same battery, and the battery decays faster; secondly, the failure rate of the fan is higher due to long-term use; thirdly, the equipment has larger power consumption and serious electric energy waste in the using process.

There are also some methods for solving the temperature variation of the battery and the temperature unevenness of the battery, in which a phase change material is filled in the gaps (spaces) of the battery module or the gaps of the battery, but the phase change material is not well filled in the gaps of the battery module by filling the phase change material. In addition, the mode of filling the phase change material is not beneficial to subsequent overhaul and maintenance of the battery module. In the battery temperature equalizing or reducing effect, because the phase change material is not uniformly filled, small temperature difference still exists between batteries or between all parts of the batteries, and the service performance and the service life of the battery module are affected.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a uniform-temperature double-layer battery module which has high stability of the whole structure, no power consumption, small temperature difference and no insulating property.

In order to solve the technical problems, the utility model provides a uniform-temperature double-layer battery module, which comprises: the device comprises a plurality of batteries, end plates and a bracket, wherein the batteries are sequentially arranged in an upper layer and a lower layer to form a battery pack, two ends of the battery pack are fixed through the end plates, and the battery pack is arranged on the bracket; there is also a sheet of phase change material disposed on four surfaces of each of the cells, the four surfaces being adjacent to the faces of the electrodes of the cells.

Optionally, the upper surface of the battery pack is provided with a first phase change material sheet, the upper layer and the lower layer of the battery are provided with a second phase change material sheet, the lower surface of the battery pack is provided with a third phase change material sheet, and a fourth phase change material sheet is arranged between two adjacent batteries in each layer.

Optionally, the left side and the right side of each fourth phase change material sheet are provided with first limiting insulating sheets.

Optionally, the left side and the right side of the second phase change material sheet are provided with second limiting insulating sheets.

Optionally, the height of the first spacing insulating sheet is equal to the height of the fourth phase change material sheet, and the length of the second spacing insulating sheet is equal to the length of the second phase change material sheet.

Optionally, the thickness of the first spacing insulating sheet is equal to the thickness of the fourth phase change material sheet, and the thickness of the second spacing insulating sheet is equal to the thickness of the second phase change material sheet.

Optionally, the phase change material sheet is made of a polymer phase change material, and the phase change material has a flame retardant rating of UL94-VO.

Optionally, the first phase change material sheet, the second phase change material sheet and the third phase change material sheet have the same length and width.

Optionally, the phase change material sheets and the spacing insulating sheets between two adjacent batteries are adhered to the batteries by back glue, and the first phase change material sheet, the second phase change material sheet and the third phase change material sheet are respectively connected to the upper surface, the upper layer battery, the lower layer battery and the lower surface of the battery pack by back glue.

Optionally, the batteries at the two ends of the battery pack are adhered to the end plates by back glue.

Compared with the prior art, the utility model has the following advantages: the battery module is provided with phase change material sheets, the phase change material sheets are arranged on four surfaces of each battery, the four surfaces are four surfaces adjacent to the surfaces where the electrodes of the batteries are positioned, and the periphery of the batteries is covered by the phase change materials, so that the temperature difference of the batteries is reduced; in addition, in the use process of the battery module, the temperature is controlled by utilizing the characteristics of the phase change material, the power consumption is avoided, the phase change material has flame retardance and insulating property, and the problem of insulating property is avoided.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the accompanying drawings:

fig. 1 is a schematic structural view of a uniform temperature double-layer battery module according to an embodiment of the present utility model;

fig. 2 is a schematic view of a battery according to an embodiment of the present utility model;

FIG. 3 is a schematic diagram of a lower layer battery pack with a phase change material sheet according to an embodiment of the present utility model;

FIG. 4 is a schematic diagram of a structure of an upper and lower battery pack with phase change material sheets according to an embodiment of the present utility model;

FIG. 5 is a structural representation of an underlying battery pack having a sheet of phase change material between end plates in accordance with one embodiment of the present utility model;

fig. 6 is a schematic view illustrating the configuration of three phase change material sheets in a battery module according to an embodiment of the present utility model;

fig. 7 is a schematic view illustrating a configuration of all phase change material sheets in a battery module according to an embodiment of the present utility model.

The reference numerals in the drawings are respectively as follows:

101-batteries, 102-fixing strips, 103-end plates, 104-brackets, 105-long bolts, 106-integrated busbar and 107-connectors;

201-a first phase change material sheet, 202-a second phase change material sheet, 203-a third phase change material sheet, 204-a fourth phase change material;

301-first spacing insulating flake, 302-second spacing insulating flake.

Detailed Description

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are used in the description of the embodiments will be briefly described below. It is apparent that the drawings in the following description are only some examples or embodiments of the present application, and it is obvious to those skilled in the art that the present application may be applied to other similar situations according to the drawings without inventive effort. Unless otherwise apparent from the context of the language or otherwise specified, like reference numerals in the figures refer to like structures or operations.

As used in this application and in the claims, the terms "a," "an," "the," and/or "the" are not specific to the singular, but may include the plural, unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that the steps and elements are explicitly identified, and they do not constitute an exclusive list, as other steps or elements may be included in a method or apparatus.

In the description of the present application, it should be understood that, where azimuth terms such as "front, rear, upper, lower, left, right", "transverse, vertical, horizontal", and "top, bottom", etc., indicate azimuth or positional relationships generally based on those shown in the drawings, only for convenience of description and simplification of the description, these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present application; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are merely for convenience of distinguishing the corresponding components, and unless otherwise stated, the terms have no special meaning, and thus should not be construed as limiting the scope of the present application. Furthermore, although terms used in the present application are selected from publicly known and commonly used terms, some terms mentioned in the specification of the present application may be selected by the applicant at his or her discretion, the detailed meanings of which are described in relevant parts of the description herein. Furthermore, it is required that the present application be understood, not simply by the actual terms used but by the meaning of each term lying within.

The battery module generally includes a number of batteries 101, fixing bars 102, end plates 103, brackets 104, long bolts 105, integrated busbar 106 (CCS, cells Contact System), and connectors 107. The bracket 104 is positioned at the lowest part of the whole battery module, each battery 101 is placed on the bracket 104, and the batteries 101 are closely arranged to form a battery pack. At both ends of the battery are two end plates 103, and after the battery and both end plates 103 are pressed, the end plates 103 are fixed to brackets 104 using long bolts 105. In addition, in order to secure the stability of the overall structure of the battery module, fixing bars 102 are used to fix the respective batteries 101 in the battery module. The battery module further has an integrated busbar 106, the integrated busbar 106 is also often called a harness board integrated part, and a plug-in unit 107 connected with other components, the ccs assembly mainly has the functions of current carrying and collecting the voltage and temperature of the battery 101, and meanwhile, the integrated busbar 106 also has the function of overcurrent protection, and the plug-in unit 107 mainly has the function of current carrying. Other technical details about the battery module are not described herein.

In this embodiment, the battery module is structurally improved in order to balance the temperature between the batteries 101 in the battery module. Fig. 1 is a schematic structural diagram of a uniform-temperature double-layer battery module according to an embodiment of the present utility model, referring to fig. 1, the battery module has an upper layer of battery 101 and a lower layer of battery 101, the bottom of the battery module has two brackets 104, a plurality of batteries 101 arranged in sequence in the upper layer and the lower layer form a battery pack, two ends of the battery pack are fixed by end plates 103, and the battery pack is placed on the brackets 104. The battery module further has phase change material sheets, each of which is disposed on four surfaces of each of the batteries 101, the four surfaces being four surfaces adjacent to the surface where the electrodes of the batteries 101 are located.

In the present embodiment, all four major surfaces of the cells 101 have the phase change material sheets, so the temperature difference between the cells 101 is relatively small, and the temperature equalizing effect is achieved. The temperature rise of the battery 101 can be ensured within a reasonable interval by the simulation design with enough amount of phase change material.

Fig. 2 is a schematic view of a battery according to an embodiment of the present utility model, referring to fig. 2. The square-shaped cell 101 has six surfaces, where the electrode is located on the surface F0, and 4 surfaces adjacent to the surface F0 are the upper surface F1, the rear surface F2, and the lower surface F3, the front surface F4, respectively. In order to reduce or even balance the temperature between the cells 101 or between the parts of the cells 101, phase change material sheets are provided on the surfaces F1, F2, F3 and F1 for the purpose of temperature equalization. The battery module in this embodiment includes a plurality of batteries 101, so that the phase change material sheets may be provided on the above 4 surfaces of each battery 101.

In this embodiment, the four surfaces of the battery 101 are provided with phase change material sheets, and the phase change material absorbs heat to prevent or delay the temperature rise of the battery 101 when the battery 101 generates heat and the temperature of the battery 101 exceeds the phase change point of the phase change material by utilizing the characteristics of the phase change material during the charge and discharge process of the battery pack and under the condition of environmental temperature change; if the battery 101 cools and the temperature of the battery 101 exceeds the phase change point of the phase change material, the phase change material radiates heat, preventing or slowing down the cooling of the battery 101. Thus, the temperature of the battery 101 can be maintained within a small range by the phase change material.

In one example, the upper surface of the battery pack has a first phase change material sheet 201, a second phase change material sheet 202 is provided between the upper and lower layers of cells 101, the lower surface of the battery pack has a third phase change material sheet 203, and a fourth phase change material sheet 204 is provided between adjacent two cells 101 in each layer of the battery module.

In this embodiment, one possible implementation manner is to coat the phase change material sheets on 4 surfaces of each battery 101 in the battery module, then combine the coated batteries 101 together, and then place the combined battery pack on the bracket 104, and form the final battery module through a subsequent series of steps. However, in the process of forming the battery module in this way, the assembly mode of the phase change material sheet has the following disadvantages: firstly, the phase change material sheets between each cell 101 are repeatedly coated, so that the phase change material sheets are wasted; and secondly, the phase change material sheets on the upper and lower surfaces of the battery pack and between two adjacent batteries 101 are formed by splicing a plurality of scattered phase change material sheets, and the phase change material sheets have no integrity and influence the structural strength of the phase change material sheets. Therefore, in the present embodiment, the battery 101 in the present embodiment is covered with the phase change material sheet having a larger area as much as possible while ensuring the temperature equalizing effect, and the process and the time for covering the phase change material sheet are reduced.

It can be seen that in this embodiment, the upper surface of the battery pack has the first phase change material sheet 201, and the maximum area of the first phase change material 201 is approximately equal to the area of the entire upper surface of the battery pack. The upper and lower layers of cells 101 have a second sheet of phase change material 202 therebetween, and the maximum area of the second sheet of phase change material 202 is approximately equal to the area of the upper surface of the entire battery pack. The lower surface of the battery pack has a third phase change material sheet 203, and the maximum area of the third phase change material sheet 203 is approximately equal to the area of the entire upper surface of the battery pack. A fourth phase-change material sheet 204 is provided between two adjacent cells 101 in each layer of the battery module, and the maximum area of the fourth phase-change material sheet 204 is approximately equal to the area of the large face of the cell 101 (the face where the cell 101 is largest).

In one example, each fourth sheet of phase change material 204 has a first spacing insulator 301 on both the left and right sides. Further, the second phase change material sheet 202 has second spacing insulating sheets 302 on both left and right sides.

Fig. 3 is a schematic structural diagram of a lower layer battery pack according to an embodiment of the present utility model, and referring to fig. 3, a fourth phase change material sheet 204 is shown in front of the diagram, and has a first limiting insulating sheet 301 on the left side and a first limiting insulating sheet 301 on the right side.

In this embodiment, referring to fig. 3 and 4, the two sides of the first phase change material sheet 201 and the two sides of the third phase change material sheet 203 may not be provided with the spacing insulating sheets, because the upper and lower surfaces of the battery pack are further provided with the fixing bars 102 for fixing the respective cells 101 in the battery pack after the entire battery module is assembled, and the two sides of the phase change material sheets may not be provided with the spacing insulating sheets for the compactness of the battery module structure.

Fig. 5 is a structural view showing a structure between end plates when a lower battery pack has a phase change material sheet in an embodiment of the present utility model, and referring to fig. 5, a second phase change material sheet 202 is shown in the middle of the drawing, a second spacing insulating sheet 302 is provided on the left side of the second phase change material sheet 202, and a second spacing insulating sheet 302 is also provided on the right side thereof.

In this embodiment, the limiting insulating sheet adhered to the surface of the battery 101 mainly plays two roles of limiting protection, and firstly, in the mounting process of the battery module, the limiting insulating sheet plays a role of limiting because the phase change material sheet is required to be ensured to be stressed in a certain Fan Wei due to stress. Secondly, in the phase change process of the phase change material, the phase change material sheet can change in hardness (becomes soft or hard), so that the shape of the phase change material sheet is not changed in the phase change process, and the limit insulating sheet can play a role in limit protection.

In an example, the height of the first spacing insulating strip 301 is equal to the height of the fourth phase change material strip 204, and the length of the second spacing insulating strip 302 is equal to the length of the second phase change material strip 202.

With continued reference to fig. 3, the height of the first spacing insulating part 301 is H2, the height of the fourth phase change material sheet 204 is H1, and h1=h2, so that the upper and lower edges of the first spacing insulating part 301 and the fourth phase change material sheet 204 can be flush.

With continued reference to fig. 5, the second spacing insulating strip 302 has a length L2, the second phase change material strip 202 has a length L1, and l1=l2, so that the length of the second spacing insulating strip 302 can be flush with the front and rear edges of the second phase change material strip 202.

In an example, the thickness of the first spacing insulating strip 301 is equal to the thickness of the fourth phase change material strip 204, and the thickness of the second spacing insulating strip 302 is equal to the thickness of the second phase change material strip 202. The phase change material sheets corresponding to the positions of the limiting insulating sheets have basically the same thickness, so that the surface of the whole structure formed by the limiting insulating sheets and the phase change material sheets is smooth, the surface of the battery pack or the whole battery module is smoother, and the assembled battery module structure is more compact and stable.

In one example, the phase change material sheet is made of a polymer phase change material, and the phase change material has a flame retardant rating of UL94-VO. The U.S. flame retardant and fire retardant class is classified into four classes, which are arranged from low to high in the order of v2, v1, v0, 5v. UL94-v0 is the third level in the U.S. flame retardant rating standard, and by adopting the phase-change material sheet, the appearance state before and after phase change is still solid state or the phase-change material is packaged by an insulating shell, and the shell is unchanged before and after phase change.

In one example, the first phase change material sheet 201, the second phase change material sheet 202, and the third phase change material sheet 203 are the same in length and width.

Fig. 6 is a schematic view showing a configuration of three phase change material sheets in a battery module according to an embodiment of the present utility model, and referring to fig. 6, a first phase change material sheet 201, a second phase change material sheet 202, and a third phase change material sheet 203 are phase change material sheets having a maximum area that may be approximately equal to an upper surface area of a battery pack according to the embodiment, and may have the same size, which is advantageous in that the three phase change material sheets have a uniform size, are manufactured using production, and are also assembled with uniform size, so that the battery module structure of the embodiment is more standard and uniform.

In an example, the phase change material sheet and the spacing insulating sheet between two adjacent cells are adhered to the cell 101 by back glue, and the first phase change material sheet 201, the second phase change material sheet 202 and the third phase change material sheet 203 are respectively connected to the upper surface, between the upper and lower cells and the lower surface of the battery pack by back glue.

Further, the batteries 101 at the two ends of the battery pack are adhered to the end plate 103 by back glue.

In this embodiment, the phase change material sheet and the limiting insulating sheet are bonded by using the back adhesive, and an assembly mode of the battery module of this embodiment is as follows: the battery module comprises an upper layer of battery 101 and a lower layer of battery 101, and two brackets 104 are arranged at the bottom of the battery module, and an end plate 103 at one end is fixed on the two brackets 104 through a tool.

The lower cell 101 is mounted. The first cell 101 adjacent to the end plate 103 is attached with the fourth phase change material sheet 204 with double-sided back adhesive on both large faces thereof, and is attached with the first spacing insulating sheet 301 with double-sided back adhesive for spacing, and the remaining cells 101 are sequentially attached with the fourth phase change material sheet 204 with double-sided back adhesive on a single large face thereof, and are then sequentially mounted on the bracket 104. Then, a second spacing insulating sheet 202 with double-sided adhesive tape and a second phase change material sheet 202 with double-sided adhesive tape are attached to the upper surface of the first layer of battery pack, and the second spacing insulating sheet 202 is generally in a strip shape. After the completion of this mounting step, the battery module part structure is shown in fig. 5.

The upper cell 101 is then mounted. Similar to the lower cell mounting mode, the first cell 101 adjacent to the end plate 103 is stuck with the fourth phase change material sheet 204 with double-sided back glue on both large faces, and is stuck with the first spacing insulating sheet 301 with double-sided back glue for spacing, and the rest cells 101 are stuck with the fourth phase change material sheet 204 with double-sided back glue on a single large face in sequence.

After that, the other end plate 103 is mounted, and the fixing bar 102 is put on by pressing to a proper position, and two long bolts 105 are attached, so that both the fixing bar 102 and the end plate 103 are fixed to the bracket 104. After the fixing is completed, a first phase change material sheet 201 and a third phase change material sheet 203 with single-sided adhesive are stuck on the upper surface and the lower surface of the battery pack. The structure of all the phase change material sheets can be referred to as fig. 7, in which the voids formed by the phase change material sheets are the locations where the cells 101 are placed.

The temperature-equalizing double-layer battery module provided by the embodiment comprises a plurality of batteries 101, end plates 103 and a bracket 104, wherein the batteries 101 which are sequentially arranged in an upper layer and a lower layer form a battery pack, two ends of the battery pack are fixed through the end plates 103, and the battery pack is arranged on the bracket 104; the battery module is also provided with phase change material sheets, the phase change material sheets are arranged on four surfaces of each battery 101, and the four surfaces are four surfaces adjacent to the surfaces of the electrodes of the batteries 101, and the temperature difference of the batteries 101 is reduced due to the fact that the periphery of the batteries 101 is covered by the phase change materials; in addition, in the use process of the battery module, the temperature is controlled by utilizing the characteristics of the phase change material, the power consumption is avoided, the phase change material has flame retardance and insulating property, and the problem of insulating property is avoided.

While the basic concepts have been described above, it will be apparent to those skilled in the art that the above disclosure is by way of example only and is not intended to be limiting. Although not explicitly described herein, various modifications, improvements, and adaptations of the present application may occur to one skilled in the art. Such modifications, improvements, and modifications are intended to be suggested within this application, and are therefore within the spirit and scope of the exemplary embodiments of this application.

Meanwhile, the present application uses specific words to describe embodiments of the present application. Reference to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic is associated with at least one embodiment of the present application. Thus, it should be emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various positions in this specification are not necessarily referring to the same embodiment. Furthermore, certain features, structures, or characteristics of one or more embodiments of the present application may be combined as suitable.

Likewise, it should be noted that in order to simplify the presentation disclosed herein and thereby aid in understanding one or more inventive embodiments, various features are sometimes grouped together in a single embodiment, figure, or description thereof. This method of disclosure, however, is not intended to imply that more features than are presented in the claims are required for the subject application. Indeed, less than all of the features of a single embodiment disclosed above.

While the present application has been described with reference to the present specific embodiments, those of ordinary skill in the art will recognize that the above embodiments are for illustrative purposes only, and that various equivalent changes or substitutions can be made without departing from the spirit of the present application, and therefore, all changes and modifications to the embodiments described above are intended to be within the scope of the claims of the present application.

Claims (10)

1. A temperature equalization double-layer battery module, comprising: a plurality of batteries, end plates and a bracket, wherein,

a plurality of batteries which are sequentially arranged on an upper layer and a lower layer form a battery pack, two ends of the battery pack are fixed through end plates, and the battery pack is arranged on the bracket;

there is also a sheet of phase change material disposed on four surfaces of each of the cells, the four surfaces being adjacent to the faces of the electrodes of the cells.

2. The uniform-temperature double-layer battery module according to claim 1, wherein the upper surface of the battery pack is provided with a first phase-change material sheet, a second phase-change material sheet is arranged between the upper and lower layers of the batteries, the lower surface of the battery pack is provided with a third phase-change material sheet, and a fourth phase-change material sheet is arranged between two adjacent batteries in each layer.

3. The uniform temperature double-layer battery module according to claim 2, wherein each of the fourth phase-change material sheets has first limit insulating sheets on both left and right sides.

4. The uniform temperature double-layer battery module according to claim 3, wherein the second phase-change material sheet has second limit insulating sheets on both left and right sides.

5. The uniform-temperature double-layer battery module according to claim 4, wherein the first limiting insulating sheet has a height equal to that of the fourth phase-change material sheet, and the second limiting insulating sheet has a length equal to that of the second phase-change material sheet.

6. The uniform-temperature double-layer battery module according to claim 4, wherein the thickness of the first limiting insulating sheet is equal to the thickness of the fourth phase-change material sheet, and the thickness of the second limiting insulating sheet is equal to the thickness of the second phase-change material sheet.

7. The uniform temperature double-layer battery module according to any one of claims 1 to 6, wherein the phase-change material sheet is made of a polymer phase-change material, and the phase-change material has a flame retardant rating of UL94-VO.

8. The uniform temperature double-layer battery module according to claim 2, wherein the first phase-change material sheet, the second phase-change material sheet, and the third phase-change material sheet are identical in length and width.

9. The uniform-temperature double-layer battery module according to claim 2, wherein the phase-change material sheets and the limiting insulating sheets between two adjacent batteries are adhered to the batteries by back glue, and the first phase-change material sheet, the second phase-change material sheet and the third phase-change material sheet are respectively connected to the upper surface, the upper layer battery, the lower layer battery and the lower surface of the battery pack by back glue.

10. The uniform-temperature double-layer battery module according to claim 1, wherein the batteries at the two ends of the battery pack are adhered to the end plates by back adhesive.