WO2016101872A1

WO2016101872A1 - Battery cooling plate assembly and method for preparing the same, battery module, battery package and electric vehicle

Info

Publication number: WO2016101872A1
Application number: PCT/CN2015/098291
Authority: WO
Inventors: Weixin Zheng; Jianhua Zhu; Xi Shen; Luxia Jiang; Zhipei LU; Yan Zhu
Original assignee: Byd Company Limited
Priority date: 2014-12-23
Filing date: 2015-12-22
Publication date: 2016-06-30
Also published as: CN105789728B; CN105789728A

Abstract

A battery cooling plate assembly includes: a lower cooling plate, an upper cooling plate, having a passage molding portion, and a coolant passage defined between the lower cooling plate and the passage molding portion of the upper cooling plate; wherein the passage molding portion of the upper cooling plate has an edge connected with the lower cooling plate via electromagnetic pulse welding. The coolant passage may be formed at the same time by electromagnetic pulse welding, which may cancel the step of stamping, thus may decrease manufacturing cost of the battery cooling plate assembly.

Description

BATTERY COOLING PLATE ASSEMBLY AND METHOED FOR PREPARING THE SAMEE, BATTERY MODULE, BATTERY PACKAGE AND ELECTRIC VEHICLE

CROSS-REFERENCE TO RELATED APPLICATION

The present application claims priority to and benefits of Chinese Patent Application No. 201410811906.1, filed with the State Intellectual Property Office (SIPO) of the People's Republic of China on December 23, 2014, the entire content of which is hereby incorporated by reference.

FIELD

The present disclosure relates to a battery cooling plate and a method preparing the same, a battery module, a battery package and an electric vehicle, and more particularly relates to a cooling plate assembly, a method preparing the same, a cooling plate assembly obtained by the method, a battery module, a battery package including the battery module, and an electric vehicle including the battery package.

BACKGROUND

A battery cooling plate is a necessary component of a battery module, which has a passage for the flow of a coolant, thus to achieve cooling of the battery module.

The current battery cooling plate is usually manufactured by stamping to mold an upper cooling plate formed with a passage, then welding with a lower cooling plate. When the passage has a different design, a new stamping die is needed, thus may increase manufacturing cost of the battery cooling plate.

In addition, the battery cooling plate may subject to a high temperature during the process of welding, thus may be easy to appear a deformation, which may affect the application. And, a welding seam formed by prior welding methods shows some deficiencies of the connection and sealing strength. Thus, a new battery cooling plate with a higher connection and sealing strength needs to be provided.

SUMMARY

The present disclosure aims to solve at least one of the above problems to some extent.

Accordingly, a battery cooling plate assembly and a method of preparing the same, a battery module, a battery package and an electric vehicle are provided by the present disclosure.

A battery cooling plate assembly according to embodiments of the present disclosure includes: a lower cooling plate, an upper cooling plate, having a passage molding portion, and a coolant passage defined between the lower cooling plate and passage molding portion of the upper cooling plate； in which the passage molding portion of the upper cooling plate has an edge connected with the lower cooling plate via electromagnetic pulse welding.

In some embodiments, the lower cooling plate and the upper cooling plate are made of different metals.

In some embodiments, a surface of the edge of the passage molding portion of the upper cooling plate contacted to the lower cooling plate has no transition layer thereon.

In some embodiments, a portion of the edge of the passage molding portion of the upper cooling plate contacted to the lower cooling plate has a width of about 1 mm to about 20 mm.

In some embodiments, the portion of the edge of the passage molding portion of the upper cooling plate contacted to the lower cooling plate has a width of about 8 mm to about 15 mm.

In some embodiments, a connection strength between the edge of the passage molding portion of the upper cooling plate and the lower cooling plate is about 100 MPa to about 800 MPa.

In some embodiments, the connection strength between the edge of the passage molding portion of the upper cooling plate and the lower cooling plate is about 400 MPa to about 600 MPa.

In some embodiments, a sealing strength between the edge of the passage molding portion of the upper cooling plate and the lower cooling plate is about 0.01 MPa to about 0.2 MPa.

In some embodiments, the sealing strength between the edge of the passage molding portion of the upper cooling plate and the lower cooling plate is about 0.01 MPa to about 0.06 MPa.

In some embodiments, the upper cooling plate is made of a high specific heat metal, and the lower cooling plate is made of a light metal.

In some embodiments, the upper cooling plate is made of at least one material selected from a group consisting of copper, copper alloy, and steel.

In some embodiments, the lower cooling plate is made of at least one material selected from a group consisting of aluminum, aluminum alloy, and magnesium alloy.

In some embodiments, the coolant passage has a width of about 3 mm to about 30 mm, and a height of about 0.3 mm to about 2 mm.

In some embodiments, the coolant passage is substantially of a straight shape or a bent shape.

A method for preparing a battery cooling plate assembly according to embodiments of the present disclosure includes: providing a first cooling plate and an second cooling plate disposed in parallel to and spaced apart from each other, and connecting the second cooling plate with the first cooling plate via electromagnetic pulse welding with forming a passage molding portion on the second cooling plate and obtaining an connection between the first cooling plate and the second cooling plate； in which a coolant passage is defined between the first cooling plate and the second cooling plate via the electromagnetic pulse welding.

In some embodiments, at least two connection parts are obtained via the electromagnetic pulse welding, and the coolant passage is defined between adjacent two atomic connection parts； the coolant passage has a width of about 3 mm to about 30 mm.

In some embodiments, the coolant passage has a height of about 0.3 mm to about 2 mm.

In some embodiments, the two connection parts are parallel to each other.

In some embodiments, the electromagnetic pulse welding is performed under a welding energy of about 16 KJ to about 64 KJ.

A battery cooling plate assembly obtained by a method according to embodiments of the present disclosure is also provided.

A battery module including a plurality of battery cooling plate assemblies is also provided, in which the battery cooling plate assembly is the cooling plate assembly mentioned above.

A battery package including a plurality of battery modules is also provided, in which in which the battery module is the battery module mentioned above.

An electric vehicle, including a plurality of battery packages is also provided, in which the battery package is the battery package mentioned above.

According to embodiments of the present disclosure, by providing a structure in which the passage molding portion of the upper cooling plate has an edge connected with the lower cooling plate via electromagnetic pulse welding, the battery cooling plate assembly may show a high strength, a good heat dissipation and a light weight when using a high specific heat metal, such as copper, and a lightweight metal, together with a better connection strength and sealing performance. With the method according to embodiments of the present disclosure, when connecting the upper cooling plate and the lower cooling plate, the coolant passage may be formed at the same time by electromagnetic pulse welding, which may cancel the step of stamping, thus may decrease manufacturing cost of the battery cooling plate assembly.

Additional aspects and advantages of embodiments of present disclosure will be given in part in the following descriptions, become apparent in part from the following descriptions, or be learned from the practice of the embodiments of the present disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other aspects and advantages of embodiments of the present disclosure will become apparent and more readily appreciated from the following descriptions made with reference to the accompanying drawings, in which:

Fig. 1 is a schematic view of a first cooling plate and a second cooling plate before electromagnetic pulse welding according to an embodiment of the present disclosure；

Fig. 2 is a schematic view of a first cooling plate and a second cooling plate after electromagnetic pulse welding or a battery cooling plate assembly according to an embodiment of the present disclosure；

Fig. 3 is a schematic view of a battery cooling plate assembly according to an embodiment of the present disclosure；

Fig. 4 is a top view of a coolant passage according to a first embodiment of the present disclosure；

Fig. 5 is a top view of a coolant passage according to a second embodiment of the present disclosure；

Fig. 6 is a top view of a coolant passage according to a third embodiment of the present disclosure；

Fig. 7 is a metallography image of a connection formed by electromagnetic pulse welding according to an embodiment of the present disclosure；

Fig. 8 is a metallography image of a connection formed by laser welding； and

Fig. 9 is a metallography image of a broken connection formed by laser welding.

Reference numerals

Lower cooling plate 10, upper cooling plate 20, first cooling plate 1, second cooling plate 2, passage 3, welding seam 4, original part 5 and deformed part 6.

DETAILED DESCRIPTION

Reference will be made in detail to embodiments of the present disclosure, where the same or similar elements and the elements having the same or similar functions are denoted by like reference numerals throughout the descriptions. The embodiments described herein with reference to drawings are explanatory, illustrative, and used to generally understand the present disclosure. The embodiments shall not be construed to limit the present disclosure.

In the specification, it is to be understood that terms such as “length, ” “width, ” “thickness, ” “upper, ” “lower, ” “front, ” “rear, ” “left, ” “right, ” “vertical, ” “horizontal, ” “top, ” “bottom, ” “inner, ” and “outer” should be construed to refer to the orientation as then described or as shown in the drawings under discussion. These relative terms are for convenience of description and do not require that the present disclosure be constructed or operated in a particular orientation, thus shall not be construed to limit the present disclosure. In addition, terms such as “first” and “second” are used herein for purposes of description and are not intended to indicate or imply relative importance or significance or to imply the number of indicated technical features. Thus, the feature defined with “first” and “second” may include one or more of this feature. In the description of the present disclosure, “a plurality of” means at least two, e.g. two, three and so on, unless specified otherwise.

In the description of the present disclosure, it should be understood that, unless specified or limited otherwise, the terms “mounted, ” “supported, ” “connected, ” and “coupled” and variations thereof are used broadly and encompass such as mechanical or electrical mountings, connections and couplings, also can be inner mountings, connections and couplings of two components, and further can be direct and indirect mountings, connections, and couplings, which can be understood by those skilled in the art according to the detail embodiment of the present disclosure.

A battery cooling plate assembly according to embodiments of the present disclosure will be described with reference to drawings.

As shown in Fig. 2 or 3, the battery cooling plate assembly according to embodiments of the present disclosure includes: a lower cooling plate 10, an upper cooling plate 20 with a passage molding portion, and a coolant passage 3 defined between the passage molding portion of the upper cooling plate 20 and the lower cooling plate 10； and the passage molding portion of the upper cooling plate 20 has an edge connected with the lower cooling plate 10 via electromagnetic pulse welding.

In some embodiments, as shown in Fig. 2 or 3, the upper cooling plate 20 is connected with the lower cooling plate 10 at the welding seam 4 via the edge of the passage molding portion thereof. The upper cooling plate 20 is derived from a second cooling plate 2, in other words, the second cooling plate 2 is used to prepare the cooling plate module plate assembly. That means, the second cooling plate 2 just refers to a flat metal board, while the upper cooling plate refers to a metal board formed with a passage molding portion. In some embodiments according to the preseng disclosure, after electromagnetic pulse welding, the second cooling plate 2 may be deformed at welding place to obtain an upper cooling plate 20 having a passage molding portion, in which the passage molding portion includes an original part 5 and a deformed part 6. Then the coolant passage 3 is defined between the lower cooling plate and the passage molding portion of the upper cooling plate, in other words, the coolant passage is defined between the original part 5, the deformed part 6 and the first cooling plate 1.

In some embodiments, the upper cooling plate may be made of a high specific heat metal, which may provide a good heat dissipation for the battery cooling plate assembly. And, the lower cooling plate may be made of a lightweight metal, which may decrease the weight of the cooling plate assembly. It’s not so easy to achieve welding between different metals through conventional methods, and one of the cooling plates must be preformed with a passage before welding, which increases manufacturing processes. But according to the present disclosure, with the method of electromagnetic pulse welding, two different metals may be connected with each other easily and a coolant passage may be formed at one of cooling plates (i.e. the upper cooling plate) at the same time, then the process of stamping to preform a coolant passage may be cancelled. Meanwhile, electromagnetic pulse welding is a non-molten welding method, thus there is no heat affected zone existed which is unlike conventional welding method.

According to the present disclosure, electromagnetic pulse welding is a non-molten welding method. In some embodiments, the lower cooling plate and the upper cooling plate are made of different metals. And, a surface of the edge of the passage molding portion of the upper cooling plate contacted to the lower cooling plate has no transition layer thereon. In the description of the present disclosure, it should be understood that, unless specified or limited otherwise, the term “transition layer” refers to a structure formed by a molten welding method, particularly refers to a recrystallization structure after melting of two different metals which are configured to manufacture a cover and a shell of a battery respectively； or the term “transition layer” refers to a structure formed by a brazing method, particularly refers to a brazing layer formed between a cover and a shell of a battery by the method of brazing. Through the welding method according the present disclosure, i.e. through the electromagnetic pulse welding, the passage molding portion of the upper cooling plate has an edge connected with the lower cooling plate in an atomic connection manner.

A welding seam 4 formed by the method of electromagnetic pulse welding according to the present disclosure has a metallography image as shown in Fig. 7. As can be seen in a marked rectangular frame of Fig. 7, the edge of the passage molding portion of the upper cooling plate is contacted to the lower cooling plate with no transition layer, which means there is no alloy or other composite formed between the upper cooling plate and the lower cooling plate.

In some embodiments, a portion of the edge of the passage molding portion of the upper cooling plate contacted to the lower cooling plate has a width of about 1 mm to about 20 mm. In other word, the welding seam 4 has a width of about 1 mm to about 20 mm, as can be seen in Fig. 2. In some embodiments, the portion of the edge of the passage molding portion of the upper cooling plate contacted to the lower cooling plate has a width of about 8 mm to about 15 mm. In other word, the welding seam 4 has a width of about 8 mm to about 15 mm, as can be seen in Fig. 2.

In some embodiments, a connection strength between the edge of the passage molding portion of the upper cooling plate and the lower cooling plate is about 100 MPa to about 800 MPa. In some embodiments, the connection strength between the edge of the passage molding portion of the upper cooling plate and the lower cooling plate is about 400 MPa to about 600 MPa.

In some embodiments, a sealing strength between the edge of the passage molding portion of the upper cooling plate and the lower cooling plate is about 0.01 MPa to about 0.2 MPa. In some embodiments, the sealing strength between the edge of the passage molding portion of the upper cooling plate and the lower cooling plate is about 0.01 MPa to about 0.06 MPa.

In some embodiments, the upper cooling plate is made of a high specific heat metal, and the lower cooling plate is made of a lightweight metal. For example, the upper cooling plate is made of at least one material selected from a group consisting of copper, copper alloy, and steel. The lower cooling plate is made of at least one material selected from a group consisting of aluminum, aluminum alloy, and magnesium alloy.

According to the present disclosure, the coolant passage has a width marked as “W” , and has a height marked as “t” , which can be seen in Fig. 2. In some embodiments, the coolant passage has the width of about 3 mm to about 30 mm, and the height of about 0.3 mm to about 2 mm.

In some embodiments, the shape of the coolant passage may be designed according to the requirements of the battery cooling plate. In some embodiments, the coolant passage is substantially of a straight shape or a bent shape. In one embodiment, the coolant passage may be of a U shape, as shown in Fig. 4. In a second embodiment, the coolant passage may be of a W shape, as shown in Fig. 5. In a third embodiment, the coolant passage may be of an F shape, as shown in Fig. 6.

A method for preparing a battery cooling plate assembly according to embodiments of the present disclosure will be described below.

The method includes: providing a first cooling plate and an second cooling plate disposed in parallel to and spaced apart from each other, and connecting the second cooling plate with the first cooling plate via electromagnetic pulse welding with forming a passage molding portion on the second cooling plate and obtaining an connection between the first cooling plate and the second cooling plate； in which a coolant passage is defined between the first cooling plate and the passage molding portion of the second cooling plate. In some embodiments, at least two atomic connection parts are obtained via the electromagnetic pulse welding, and the coolant passage is defined between adjacent two atomic connection parts. In some embodiments, the coolant passage has a width of about 3 mm to about 30 mm.

In some embodiments, the coolant passage has a height of about 0.3 mm to about 2 mm. In other word, the second cooling plate has a spacing apart from the first cooling plate of about 0.3 mm to about 2 mm.

In some embodiments, the two atomic connection parts are parallel to each other, thus a coolant passage defined between the adjacent two atomic connection parts may have a regular shape.

The battery cooling plate assembly obtained by a method according to embodiments of the present disclosure is also provided.

The battery module including a plurality of battery cooling plates is also provided, in which the battery cooling plate is the cooling plate assembly mentioned above.

According to the present disclosure, the plurality of battery cooling plate is mounted to the battery module for heat dissipation. In some embodiments, the battery cooling plate may be mounted between the single cells, or mounted on an outer surface of the battery module.

The battery package including a plurality of battery modules is also provided, in which in which the battery module is the battery module mentioned above.

The electric vehicle, including a plurality of battery packages is also provided, in which the battery package is the battery package mentioned above.

Hereinafter, the present disclosure will be described in details with reference to the following embodiments.

EMBODIMENT 1

A first cooling plate made of aluminum alloy and a second cooling plate made of copper was placed in parallel to and spaced apart from each other with a spacing of 2 mm. Then electromagnetic pulse welding was carried out on the second cooling plate via a welding device PS48-16/25, purchased from PST Company, under a welding energy of 16KJ. A battery cooling plate assembly was obtained, as shown in Figs. 2 and 3, in which a portion of the edge of the passage molding portion of the upper cooling plate contacted to the lower cooling plate had a width of 8 mm, i.e. the width of the welding seam was 8 mm, the width of the passage was 15 mm, the height of the passage was 2 mm, and the shape of the passage was shown in Fig. 4.

The welding seam was tested with a metallurgical microscope, and the metallography image was shown in Fig. 7. As shown in Fig. 7, a surface of the edge of the passage molding portion of the upper cooling plate contacted to the lower cooling plate had no transition layer thereon, i.e. there was no alloy or other composite formed between the upper cooling plate and the lower cooling plate.

EMBODIMENT 2

A first cooling plate made of aluminum and a second cooling plate made of copper alloy was placed in parallel to and spaced apart from each other with a spacing of 1.5 mm. Then electromagnetic pulse welding was carried out on the second cooling plate via a welding device PS48-16/25, purchased from PST Company, under a welding energy of 20KJ. A battery cooling plate assembly was obtained, as shown in Figs. 2, in which a portion of the edge of the passage molding portion of the upper cooling plate contacted to the lower cooling plate had a width of 10 mm, i.e. the width of the welding seam was 10 mm, the width of the passage was 20 mm, the height of the passage was 1.5 mm, and the shape of the passage was shown in Fig. 5.

EMBODIMENT 3

A first cooling plate made of magnesium alloy and a second cooling plate made of steel was placed in parallel to and spaced apart from each other with a spacing of 1.5 mm. Then electromagnetic pulse welding was carried out on the second cooling plate via a welding device PS48-16/25, purchased from PST Company, under a welding energy of 32 KJ. A battery cooling plate assembly was obtained, as shown in Fig. 2, in which a portion of the edge of the passage molding portion of the upper cooling plate contacted to the lower cooling plate had a width of 15 mm, i.e. the width of the welding seam was 15 mm, the width of the passage was 20 mm, the height of the passage was 1.5 mm, and the shape of the passage was shown in Fig. 6.

The welding seam was tested with a metallurgical microscope, and the metallography image was shown in Fig. 7. As shown in Fig. 7, a surface of the edge of the passage molding portion of the upper cooling plate contacted to the lower cooling plate had no transition layer, i.e. there was no alloy or other composite formed between the upper cooling plate and the lower cooling plate.

COMPARATIVE EMBODIMENT 1

A second cooling plate made of copper was stamped to be performed with a passage, and the shape of the passage was shown in Fig. 4. Then a first cooling plate made of copper and the second cooling plate was placed in parallel, in which a spacing between the first cooling plate and the second cooling plate was 0 mm. Laser welding was carried out on the second cooling plate via a welding device DISC8002, purchased from Trumpf Company, under a welding power of 8 KW and a welding speed of 80 mm/s. A battery cooling plate assembly was obtained, as shown in Figs. 2 and 3, in which the upper cooling plate was contacted to the lower cooling plate with a width of 1.5 mm, i.e. the width of the welding seam was 1.5 mm, the width of the passage was 20 mm, the height of the passage was 1.5 mm, and the shape of the passage was shown in Fig. 4.

The welding seam was tested with a metallurgical microscope, and the metallography image was shown in Fig. 8. As shown in Fig. 8, the upper cooling plate was contacted to the lower cooling plate with a transition layer, i.e. there was a new alloy phase formed between the upper cooling plate and the lower cooling plate, or there was a transition layer formed between the upper cooling plate and the lower cooling plate, which was shown in a marked circular frame of Fig. 8.

After connection strength test, the welding seam was also tested with a metallurgical microscope, and the metallography image was shown in Fig. 9. As shown in Fig. 9, the connection formed by laser welding between the upper cooling plate and the lower cooling plate was broken, i.e. the transition layer was broken.

Tests

(1) Connection Strength Test

The connection strength of the battery cooling plate assembly samples obtained above was measured by a tensile testing device GP-TS2000M purchased from Gopoint Technical Testing Company.

(2) Sealing Strength Test

The sealing strength of the battery cooling plate assembly samples obtained above was measured by a sealing testing device purchased from BYD Limited Company.

(3) Weight Test

The weight of the battery cooling plate assembly samples obtained above was tested.

The results were shown in Table 1.

Table 1

As can be seen from Table 1, the weight of the battery cooling plate assembly according to the present disclosure was lighter than COMPARATIVE EMBODIMENT 1, and the structure of the battery cooling plate assembly was very simple. And, the battery cooling plate assembly had a better connection strength and a better sealing strength. Meanwhile, there was no need to preform a passage on the cooling plate before the step of welding.

Reference throughout this specification to “one embodiment” , “some embodiments, ” “an embodiment” , “aspecific example, ” or “some examples, ” means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. Thus, the appearances of the phrases in various places throughout this specification are not necessarily referring to the same embodiment or example of the present disclosure. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

Although explanatory embodiments have been shown and described, it would be appreciated that the above embodiments are explanatory and cannot be construed to limit the present disclosure, and changes, alternatives, and modifications can be made in the embodiments without departing from scope of the present disclosure by those skilled in the art.

Claims

A battery cooling plate assembly, comprising:

a lower cooling plate,

an upper cooling plate having a passage molding portion, and

a coolant passage defined between the lower cooling plate and the passage molding portion of the upper cooling plate；

wherein the passage molding portion of the upper cooling plate has an edge connected with the lower cooling plate via electromagnetic pulse welding.
The battery cooling plate assembly according to claim 1, wherein the lower cooling plate and the upper cooling plate are made of different metals.
The battery cooling plate assembly according to claim 1 or 2, wherein a surface of the edge of the passage molding portion of the upper cooling plate contacted to the lower cooling plate has no transition layer thereon.
The battery cooling plate assembly according to any one of claims 1 to 3, wherein a portion of the edge of the passage molding portion of the upper cooling plate contacted to the lower cooling plate has a width of about 1 mm to about 20 mm.
The battery cooling plate assembly according to claim 4, wherein the portion of the edge of the passage molding portion of the upper cooling plate contacted to the lower cooling plate has a width of about 8 mm to about 15 mm.
The battery cooling plate assembly according to any one of claims 1 to 5, wherein a connection strength between the edge of the passage molding portion of the upper cooling plate and the lower cooling plate is about 100 MPa to about 800 MPa.
The battery cooling plate assembly according to claim 6, wherein the connection strength between the edge of the passage molding portion of the upper cooling plate and the lower cooling plate is about 400 MPa to about 600 MPa.
The battery cooling plate assembly according to any one of claims 1 to 7, wherein a sealing strength between the edge of the passage molding portion of the upper cooling plate and the lower cooling plate is about 0.01 MPa to about 0.2 MPa.
The battery cooling plate assembly according to claim 8, wherein the sealing strength between the edge of the passage molding portion of the upper cooling plate and the lower cooling plate is about 0.01 MPa to about 0.06 MPa.
The battery cooling plate assembly according to any one of claims 1 to 9, wherein the upper cooling plate is made of a high specific heat metal, and the lower cooling plate is made of a lightweight metal.
The battery cooling plate assembly according to claim 10, wherein the upper cooling plate is made of at least one material selected from a group consisting of copper, copper alloy, and steel.
The battery cooling plate assembly according to claim 10 or 11, wherein the lower cooling plate is made of at least one material selected from a group consisting of aluminum, aluminum alloy, and magnesium alloy.
The battery cooling plate assembly according to any one of claims 1 to 12, wherein the coolant passage has a width of about 3 mm to about 30 mm, and a height of about 0.3 mm to about 2 mm.
The battery cooling plate assembly according to any one of claims 1 to 12, wherein the coolant passage is substantially of a straight shape or a bent shape.
A method for preparing a battery cooling plate assembly, comprising:

providing a first cooling plate and a second cooling plate disposed in parallel to and spaced apart from each other, and

connecting the second cooling plate with the first cooling plate via electromagnetic pulse welding with forming a passage molding portion on the second cooling plate and obtaining an connection between the first cooling plate and the second cooling plate；

wherein a coolant passage is defined between the first cooling plate and the passage molding portion of the second cooling plate.
The method according to claim 15, wherein at least two connection parts are obtained via the electromagnetic pulse welding, and the coolant passage is defined between adjacent two connection parts； the coolant passage has a width of about 3 mm to about 30 mm.
The method according to claim 15 or 16, wherein the coolant passage has a height of about 0.3 mm to about 2 mm.
The method according to claim 16, wherein the two connection parts are parallel to each other.
The method according to any one of claims 15 to 18, wherein the electromagnetic pulse welding is performed under a welding energy of about 16 KJ to about 64 KJ.
A battery cooling plate assembly obtained by a method according to any one of claims 15 to 19.
A battery module, comprising a plurality of battery cooling plate assemblies,

wherein the battery cooling plate assembly is a cooling plate assembly according to any one of claims 1-14 and 20.
A battery package, comprising a plurality of battery modules,

wherein the battery module is a battery module according to claim 21.
An electric vehicle, comprising a plurality of battery packages,

wherein the battery package is a battery package according to claim 22.