CN116093403A

CN116093403A - Manufacturing process of battery module and battery module

Info

Publication number: CN116093403A
Application number: CN202211389108.5A
Authority: CN
Inventors: 张国江; 任朝举; 徐宇虹; 江吉兵
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2022-11-08
Filing date: 2022-11-08
Publication date: 2023-05-09

Abstract

The invention discloses a manufacturing process of a battery module and the battery module, and belongs to the technical field of batteries. The manufacturing process of the battery module comprises the following steps: s1: the cooling body is molded in an integral molding mode, so that the cooling body comprises a containing cavity and a limiting hole communicated with the containing cavity; s2: the battery cell is accommodated in the accommodating cavity and limited in the limiting hole, and a flow channel for cooling liquid to flow in is formed between the battery cell and the cooling body. The manufacturing process of the battery module and the battery module reduce the process difficulty.

Description

Manufacturing process of battery module and battery module

Technical Field

The present invention relates to the field of battery technologies, and in particular, to a manufacturing process of a battery module and a battery module.

Background

At present, the battery module mainly adopts a coiled pipe form to carry out liquid cooling on the battery cell, and the following problems exist in the structure: the battery module comprises a plurality of coiled pipes, the coiled pipes are connected in an expanding way through nylon pipes, however, the expansion connection process is difficult to realize, the yield is difficult to ensure, and the production efficiency is low.

Disclosure of Invention

An object of the present invention is to provide a manufacturing process of a battery module and a battery module, which reduce the process difficulty.

To achieve the purpose, the invention adopts the following technical scheme:

in one aspect, a manufacturing process of a battery module is provided, including:

forming the cooling body in an integral forming mode, so that the cooling body comprises a containing cavity and a limiting hole communicated with the containing cavity;

the battery cell is accommodated in the accommodating cavity and is limited in the limiting hole, and a flow channel for cooling liquid to pass in is formed between the battery cell and the cooling body.

In some possible embodiments, before introducing the cooling liquid into the flow channel, the method further comprises:

and connecting a current collector assembly to the cooling body, wherein the current collector assembly is communicated with the flow channel and is used for being connected with external cooling equipment.

In some possible embodiments, before the cell is accommodated in the limiting hole, the method further includes:

and (3) gluing the surface of the battery cell and/or the hole wall of the limiting hole, so that the battery cell is adhered to the limiting hole when being accommodated in the limiting hole.

In some possible embodiments, the battery module further includes a case, before or after the battery cell is accommodated in the limiting hole, further including:

and installing the cooling body in the box body.

In some possible embodiments, the cooling body is foam molded or injection molded by a mold.

On the other hand, provide a battery module, including cooling body and electric core, the cooling body includes holding chamber and spacing hole of mutual intercommunication, electric core holding in the holding chamber and limit is located in the spacing hole, the cooling body with electric core forms the runner, battery module adopts foretell battery module's manufacturing process to make.

In some possible embodiments, the cooling body includes a base plate and a frame connected to the base plate, the limiting hole is formed in the base plate, and the base plate and the frame form the accommodating cavity.

In some possible embodiments, the cooling body further includes a plurality of support columns, the plurality of support columns are disposed in the frame and are in supporting connection with the substrate, the support columns are disposed between adjacent cells, and the substrate, the support columns, and the periphery of the cells form the flow channel.

In some possible embodiments, the cooling body includes one substrate, and the frame and the plurality of support columns are disposed at one end of the substrate; or (b)

The cooling body comprises two base plates, and the frame and the support columns are arranged between the two base plates.

In some possible embodiments, the cooling body includes a plurality of rows of support columns arranged along a first direction, two adjacent rows of support columns are spaced apart, and the support columns and the cells form a plurality of flow channels extending along the second direction.

In some possible embodiments, the cooling body is further provided with a main channel, the main channel is arranged between the ends of the rows of support columns along the second direction and the frame, and the main channel is communicated with a plurality of flow channels.

In some possible embodiments, the battery module includes a current collector assembly connected to a side of the frame facing away from the support posts in the second direction, the current collector assembly being in communication with a plurality of the flow channels.

In some possible embodiments, the side surface of the support column along the second direction is provided with a profiling surface which is matched with the shape of the battery cell.

In some possible embodiments, the interval between two cells located in two adjacent rows is not less than 1mm; and/or

The height of the runner is not greater than the height of the battery cell; and/or

The contact area of the cell and two adjacent support columns along the second direction accounts for less than 40% of the surface area of the side wall of the cell.

In some possible embodiments, the flow channel is disposed on a single side of the battery cell along the first direction, or the flow channel is disposed on two sides of the battery cell along the first direction.

In some possible embodiments, the cooling body further comprises a partition disposed within the flow passage and dividing the flow passage into two branch passages disposed in series.

In some possible embodiments, the spacer is attached to the support column at a mid-position.

In some possible embodiments, the separator is adapted to the shape of the cell.

In some possible embodiments, two of the branch passages are provided on both sides of the partition plate in the third direction.

In some possible embodiments, the cell is a cylindrical cell.

In some possible embodiments, a glue layer is arranged between the limiting hole and the battery cell, and/or the battery cell is in interference fit with the limiting hole.

In some possible embodiments, the cooling fluid is an insulating cooling fluid.

The invention has the beneficial effects that:

according to the manufacturing process of the battery module and the battery module, the cooling body is of the forming structure, the cooling body is firstly formed, and then the battery cell is arranged in the limiting hole of the cooling body.

Drawings

FIG. 1 is a schematic view of a cooling body according to an embodiment of the present invention;

fig. 2 is a bottom view of a battery cell mounted to a cooling body according to an embodiment of the present invention;

FIG. 3 is a schematic view of a battery cell mounted on a cooling body according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a battery cell mounted on a cooling body according to a second embodiment of the present invention;

fig. 5 is an assembled view of a cooling body and current collector assembly according to a second embodiment of the present invention;

FIG. 6 is a cross-sectional view A-A of FIG. 5;

FIG. 7 is a schematic view of a cooling body according to a second embodiment of the present invention;

FIG. 8 is an enlarged view of a portion at M of FIG. 7;

fig. 9 is a schematic view of a first current collector according to a second embodiment of the invention;

fig. 10 is a sectional view of a battery module according to a second embodiment of the present invention;

fig. 11 is a partial enlarged view at N of fig. 10.

In the figure:

1. cooling the body; 11. a substrate; 111. a limiting hole; 12. a support column; 121. profiling surface; 13. a main channel; 14. a partition plate; 15. a frame; 151. a through hole;

2. a battery cell;

3. a current collector assembly; 31. a first current collector; 311. an interface; 32. a second current collector;

4. a water inlet joint; 5. a water outlet joint;

A. a flow passage; B. and (5) branching the channel.

Detailed Description

In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

Example 1

The embodiment provides a manufacturing process of a battery module, as shown in fig. 1-3, including:

s1: the cooling body 1 is molded in an integral molding mode, so that the cooling body 1 comprises a containing cavity and a limiting hole 111 communicated with the containing cavity;

s2: the battery cell 2 is accommodated in the accommodating cavity and limited in the limiting hole 111, and a flow passage A for introducing cooling liquid is formed between the battery cell 2 and the cooling body 1.

The battery module comprises a plurality of battery cells 2, a plurality of limiting holes 111 are formed in a corresponding substrate 11, the cooling body 1 is of a forming structure, the cooling body 1 is firstly formed, then the battery cells 2 are arranged in the limiting holes 111 of the cooling body 1, compared with a traditional coiled pipe form, the battery module does not need expansion connection between the coiled pipe and a nylon pipe, and the like, the coiled pipe and the nylon pipe are replaced by the cooling body 1 with an integral structure, so that the structure is simplified, the assembly process is optimized, and the production efficiency and the structural stability are improved.

Because the cooling body 1 is of a forming structure, complicated processing and assembling processes like a coiled pipe are avoided, the insulativity of the surface of the coiled pipe is influenced, the steps of intermediate processing or assembling and the like are reduced, the influence on the product quality is avoided, and the reliability of the cooling body 1 is ensured. The limiting hole 111 limits the battery cell 2, so that the mounting stability of the battery cell 2 is improved, and the perpendicularity of the battery cell 2 is improved. And a flow channel A is formed between the support column 12 and the battery cell 2, when the cooling liquid is introduced into the flow channel A, the battery cell 2 is immersed in the cooling liquid, the cooling liquid is directly used for cooling the battery cell 2, the heat exchange is enhanced, and the temperature difference between the battery cells 2 is reduced.

Compared with the traditional structure, the cooling body 1 and the battery cell 2 are compact in structure, the cooling effect of the coiled pipe is influenced by the contact area of the coiled pipe and the battery cell 2, when the contact area is increased to improve the cooling effect, the distance between the battery cells 2 can be increased, the number of the battery cells 2 to be installed is limited under the same enveloping space, the energy density of the battery is reduced, in the scheme, the distance between the battery cells 2 is conveniently adjusted according to the actual condition, and then the energy density can be improved.

In one embodiment, the cooling body 1 is formed by foaming materials such as polyurethane foam in a mold to form the limiting hole 111 and the support column 12, the process is simple, only one mold is needed for forming, the cost is low, the integral forming of the cooling body 1 structure can be realized, the whole mounting process is very convenient, and the production efficiency is high. In other embodiments, the cooling body 1 may be machined or injection molded by a mold according to specific machining requirements, and is not limited. Further, the cooling body 1 may be integrally formed, or may be formed by being divided into two or more integrally formed parts, and then bonded or otherwise connected, and may be provided as needed, without limitation.

In one embodiment, as shown in fig. 1, the cooling body 1 includes a substrate 11 and a frame 15 connected to the substrate 11, the limiting hole 111 is formed on the substrate 11, and the substrate 11 and the frame 15 form a containing cavity, so that the cooling body is simple in structure and convenient to form. Further, the cooling body 1 further comprises a plurality of support columns 12, the support columns 12 are arranged in the frame 15 and are in supporting connection with the base plate 11, the support columns 12 are filled between the adjacent electric cores 2, the base plate 11, the support columns 12 and the peripheries of the electric cores 2 form a flow channel A, the structural strength of the cooling body 1 is improved by arranging the support columns 12, cooling liquid in the accommodating cavity is disturbed, the cooling liquid flows in a preset direction, and the cooling uniformity of the electric cores 2 is improved.

In one embodiment, before the cell 2 is accommodated in the limiting hole 111, the method further includes:

s11: and (3) gluing the surface of the battery cell 2 or the hole wall of the limit hole 111, or gluing the surface of the battery cell 2 and the hole wall of the limit hole 111, so that the battery cell 2 is adhered to the limit hole 111 when being accommodated in the limit hole 111.

On one hand, the mounting strength of the battery cell 2 is guaranteed, and on the other hand, the tightness of the flow channel A is guaranteed, and leakage of cooling liquid is avoided.

Further, the arrangement of the support columns 12 and the battery cells 2 can enable the battery cells 2 and the support columns 12 to form a plurality of parallel flow channels A. When a plurality of flow channels a are formed between the battery core 2 and the cooling body 1, in order to reduce the number of joints where the cooling body 1 is connected to an external cooling device, as shown in fig. 4, before introducing the cooling liquid into the flow channels a, in one embodiment, the cooling device further includes:

s21: the current collector assembly 3 is connected to the cooling body 1, the current collector assembly 3 is communicated with the flow passage a, and the current collector assembly 3 is used for being connected with external cooling equipment.

The current collector assembly 3 is connected with external cooling equipment, and particularly, a water inlet joint 4 and a water outlet joint 5 are arranged between the current collector assembly 3 and the external cooling equipment, so that the number of connections is reduced, the structure is simplified, and the current collector assembly 3 is communicated with a plurality of flow channels A, so that the flow channels A are connected in parallel. The cooling liquid of the external cooling device enters the current collector assembly 3 through the water inlet joint 4 and then enters the flow passage A, and then flows back to the external cooling device from the flow passage A through the water outlet joint 5 of the current collector assembly 3.

Specifically, the current collector assembly 3 may be mounted on the cooling body 1 before the battery cell 2 is mounted in the limiting hole 111, or the current collector assembly 3 may be mounted on the cooling body 1 after the battery cell 2 is mounted in the limiting hole 111, which is not limited.

In one embodiment, the battery module further includes a case before or after the battery cell 2 is accommodated in the limiting hole 111, and further includes:

s3: the cooling body 1 is mounted in a box.

Specifically, the cooling body 1 may be installed in the case first, and then the battery cell 2 may be installed in the limiting hole 111, or the battery cell 2 and the cooling body 1 may be assembled first and then installed in the case, and the installation may be performed according to actual requirements, without limitation.

In one embodiment, after the cooling body 1 and the battery cell 2 are mounted in the case, the cooling body further includes:

s4: and introducing cooling liquid into the flow channel A.

The structure is fixed first and then the cooling liquid is introduced, so that the leakage of the cooling liquid is avoided.

Specifically, the manufacturing process of the battery module comprises the following steps:

s1: integrally molding the cooling body 1 to form a limiting hole 111 and a containing cavity;

s11: the surface of the battery cell 2 or the hole wall of the limit hole 111 is glued, or the surface of the battery cell 2 and the hole wall of the limit hole 111 are glued, so that the battery cell 2 is adhered to the limit hole 111 when being accommodated in the limit hole 111;

s2: the battery cell 2 is accommodated in the limiting hole 111, and a flow channel A is formed by the cooling body 1 and the periphery of the battery cell 2;

s21: connecting a current collector assembly 3 to the cooling body 1, wherein the current collector assembly 3 is communicated with the flow passage A;

s3: installing the cooling body 1 in a box body;

s31: the current collector assembly 3 is used for being connected with external cooling equipment;

s4: cooling liquid is introduced into the flow passage a.

The cooling body 1, the battery core 2 and the current collector component 3 are fixed and then are installed in the box body, so that the installation stability of the internal structure of the box body is guaranteed, the current collector component 3 is connected with external equipment, the connection stability of the box body and the external equipment is guaranteed, finally, cooling liquid is introduced, the reliability is guaranteed, and the cooling liquid leakage is prevented.

The embodiment also provides a battery module, as shown in fig. 1-3, which comprises a cooling body 1 and a battery cell 2, wherein the cooling body 1 comprises a containing cavity and a limiting hole 111 which are mutually communicated, the battery cell 2 is contained in the containing cavity and is limited in the limiting hole 111, the cooling body 1 and the battery cell 2 form a flow channel A, and the battery module is manufactured by adopting the manufacturing process of the battery module. Through above-mentioned structure and technology manufacturing process, compare in traditional coiled pipe form, need not to rise to connect etc. between coiled pipe and the nylon pipe, replace coiled pipe and the nylon pipe through the cooling body 1 of integral structure, simplified the structure, optimized the assembly process, improved production efficiency and structural stability, guaranteed the reliability of cooling body 1. The limiting hole 111 limits the battery cell 2, so that the mounting stability of the battery cell 2 is improved, and the perpendicularity of the battery cell 2 is improved. The cell 2 forms a flow channel A in the accommodating cavity, when the cooling liquid is introduced into the flow channel A, the cell 2 is immersed in the cooling liquid, the cooling liquid is directly used for cooling the cell 2, the heat exchange is enhanced, and the temperature difference between the cells 2 is reduced. In one embodiment, the cooling liquid is an insulating cooling liquid, and the cooling liquid can directly contact the surface of the battery cell 2, so that the battery cell 2 is efficiently cooled.

In one embodiment, as shown in fig. 1, the cooling body 1 includes a substrate 11 and a frame 15 connected to the substrate 11, the limiting hole 111 is formed in the substrate 11, and the substrate 11 and the frame 15 form a containing cavity, so that the cooling body is simple in structure and convenient to form. Further, the cooling body 1 further comprises a plurality of support columns 12, the support columns 12 are arranged in the frame 15 and are in supporting connection with the base plate 11, the support columns 12 are filled between the adjacent electric cores 2, the base plate 11, the support columns 12 and the peripheries of the electric cores 2 form a flow channel A, the structural strength of the cooling body 1 is improved by arranging the support columns 12, cooling liquid in the accommodating cavity is disturbed, the cooling liquid flows in a preset direction, and the cooling uniformity of the electric cores 2 is improved.

The battery module includes a plurality of electric cores 2, as shown in fig. 1, offer a plurality of spacing holes 111 on the base plate 11, in an embodiment, cooling body 1 includes a base plate 11 and a plurality of support columns 12, and the one end of base plate 11 is located to frame 15 and a plurality of support columns 12, and when cooling body 1 direct mount in the box, base plate 11, frame 15 and box form the holding chamber jointly, and cooling body 1 simple structure facilitates the shaping.

In one embodiment, as shown in fig. 2, the vertical direction in fig. 2 is a first direction, the horizontal direction is a second direction, the cooling body 1 includes a plurality of rows of support columns 12 arranged along the first direction, two adjacent rows of support columns 12 are arranged at intervals, the support columns 12 and the battery cells 2 form a plurality of channels a extending along the second direction, and the channels a are arranged and have regular shape and size, so that the battery cells 2 are heated uniformly. Further, the adjacent two rows of support columns 12 are staggered along the second direction, so that more battery cells 2 can be arranged in a limited space, and the compactness is improved.

In one embodiment, as shown in fig. 1, the side surface of the support column 12 along the second direction is provided with a profiling surface 121 corresponding to the shape of the battery cell 2, and the profiling surface 121 is attached to the battery cell 2, so that the installation stability and the structural compactness are improved. In one embodiment, the cell 2 is a cylindrical cell. Accordingly, the profiling surface 121 is an arc surface.

In this embodiment, as shown in fig. 3, two adjacent rows of the cells 2 are staggered to accommodate as many cells 2 as possible, so as to increase the battery energy density, and thus the flow channel a is arranged in a serpentine shape. The width of the flow channel a is related to the distance between the cells 2 along the first direction, in one embodiment, the distance between two adjacent cells 2 in two rows is not less than 1mm, so that the too large width of the flow channel a is avoided to reduce the number of the cells 2, and the too small width of the flow channel a is also avoided to reduce the cooling liquid inlet amount to affect the cooling effect. In one embodiment, the base area of the cell 2 and two adjacent support columns 12 along the second direction accounts for less than 40% of the surface area of the side wall of the cell, so that the contact area of the cooling liquid and the cell 2 accounts for more than 60% of the surface area of the side wall of the cell 2, and the contact area of the support columns 12 and the cell is reduced by increasing the contact area of the cooling liquid and the cell 2, so that the cooling effect is improved. In one embodiment, the height of the flow channel a is not greater than the height of the battery cell 2, and the end of the battery cell 2 extends out of the flow channel a, so that the influence on the service life caused by the arrangement of the end of the battery cell 2 in the cooling liquid is avoided, and meanwhile, the battery cell 2 is convenient to disassemble and assemble.

In one embodiment, as shown in fig. 2, the cooling body 1 is further provided with a main channel 13, that is, the main channel 13 is integrally formed on the cooling body 1, the main channel 13 is disposed between the ends of the rows of support columns 12 along the second direction and the frame 15, the main channel 13 is communicated with the plurality of flow channels a, and the main channel 13 is used for being connected with an external cooling device, so as to simplify a connection structure with the external cooling device. Typically, the water inlet connector 4 and the water outlet connector 5 are mounted on the frame 15 to be connected with external cooling equipment. Further, two main channels 13 may be provided, where the two main channels 13 are all connected in parallel with the multiple flow channels a, and the water inlet connector 4 and the water outlet connector 5 may be connected to the same main channel 13, or may be connected to the two main channels 13 respectively, and may be set according to installation space and other conditions.

In another embodiment, the current collector assembly 3 may be disposed on one side of the cooling body 1, that is, the current collector assembly 3 and the cooling body 1 are separately disposed, the current collector assembly 3 is communicated with the plurality of flow channels a, and the current collector assembly 3 is used for being connected with an external cooling device, so that connection with the external cooling device can be simplified.

In one embodiment, the flow channel a is disposed on a single side of the cell 2 along the first direction, or the flow channel a is disposed on two sides of the cell 2 along the first direction, which is not limited according to the actual situation. In this embodiment, as shown in fig. 2, two adjacent rows of electric cores 2 are provided with a flow channel a, and the cooling liquid in the flow channel a is used for cooling the two adjacent rows of electric cores 2, so as to realize cooling of two sides of the electric cores 2; and two rows of battery cells 2 positioned at two ends along the first direction, wherein a runner A is arranged at one side close to the middle row of battery cells 2 for single-side cooling.

In one embodiment, a glue layer is arranged between the limiting hole 111 and the battery cell 2, and the battery cell 2 is in interference fit with the limiting hole 111, so that on one hand, the mounting strength of the battery cell 2 is guaranteed, and on the other hand, the tightness of the flow channel A is guaranteed, and leakage of cooling liquid is avoided.

Example two

The structure of this embodiment is substantially the same as that of the first embodiment, and the structure of this embodiment is not repeated, and the difference between this embodiment and the first embodiment is that: as shown in fig. 4-8, the cooling body 1 includes two substrates 11, a frame 15 and a plurality of support columns 12 are disposed between the two substrates 11, the two substrates 11 and the frame 15 form a containing cavity, and the limiting holes 111 on the two substrates 11 limit the two ends of the battery core 2 respectively, so that the mounting reliability is improved, the requirement of sealing and mounting between the cooling body 1 and the box body is reduced, and the assembly is convenient.

In one embodiment, as shown in fig. 4 and 5, the battery module includes a current collector assembly 3, the current collector assembly 3 is connected to a side of the frame 15 facing away from the support columns 12 in the second direction, the current collector assembly 3 communicates with a plurality of flow channels a, and the current collector assembly 3 is used for connection with an external cooling device. As shown in fig. 6 to 8, a specific frame 15 is provided with a plurality of through holes 151, the plurality of through holes 151 are arranged in one-to-one correspondence with the plurality of flow channels a, and a current collector is provided with a plurality of interfaces 311, and the plurality of interfaces 311 are communicated with the plurality of through holes 151 in one-to-one correspondence.

Specifically, as shown in fig. 4 and 5, the current collector assembly 3 may include two current collectors connected to both ends of the cooling body 1 in the second direction, and specifically may be formed on two current collectors, one of which is mounted with the water inlet joint 4 and the other of which is mounted with the water outlet joint 5, or the water inlet joint 4 and the water outlet joint 5 are connected to the same current collector. Is connected with external cooling equipment through a water inlet joint 4 and a water outlet joint 5 respectively. And the water inlet joint 4 and the water outlet joint 5 are arranged on the current collector, so that the position adjustment can be carried out according to the layout of the battery pack, and the flexibility is good.

In one embodiment, as shown in fig. 6 to 8, the cooling body 1 further includes a partition 14, and the partition 14 is provided in the flow passage a and separates the flow passage a to form two branch passages B arranged in series, thereby extending the cooling path of the flow passage a. Further, the partition plates 14 are used for connecting the adjacent two rows of support columns 12, the partition plates 14 divide the flow channel A along a third direction to form two branch channels B, the third direction is the height direction of the battery cell 2, one ends of the two branch channels B are communicated, and the other ends of the two branch channels B are respectively used for liquid inlet and liquid outlet. In one embodiment, the partition 14 is connected to the middle of the support column 12 to ensure that the upper and lower branch passages B are substantially identical, and to ensure cooling uniformity of the same cell 2.

In one embodiment, as shown in fig. 4 to 11, the water inlet connector 4 and the water outlet connector 5 are both disposed on the first current collector 31, the water inlet connector 4 is respectively communicated with a plurality of branch channels B located at the upper side through the first current collector 31, the upper and lower branch channels B at corresponding positions are communicated through the second current collector 32, then the returned cooling liquid flows back to the branch channels B at the lower side through the second current collector 32, and flows into the first current collector and the water outlet connector 5 through the branch channels B at the lower side, so that circulation of the cooling liquid is realized, and cooling uniformity among the different rows of electric cells 2 is improved.

In one embodiment, the partition 14 is adapted to the shape of the battery cell 2, and can be used for limiting the battery cell 2 at the same time, so that the connection reliability between the battery cell 2 and the cooling body 1 is improved.

It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims

1. A process for manufacturing a battery module, comprising:

forming the cooling body (1) in an integral forming mode, so that the cooling body (1) comprises a containing cavity and a limiting hole (111) communicated with the containing cavity;

the battery cell (2) is accommodated in the accommodating cavity and is limited in the limiting hole (111), and a flow channel (A) for cooling liquid to pass in is formed between the battery cell (2) and the cooling body (1).

2. The process for manufacturing the battery module according to claim 1, further comprising, before introducing the cooling liquid into the flow passage (a):

-connecting a current collector assembly (3) to the cooling body (1), the current collector assembly (3) being in communication with the flow channel (a), the current collector assembly (3) being adapted to be connected to an external cooling device.

3. The manufacturing process of the battery module according to claim 1, wherein the battery cell (2) is accommodated before the limiting hole (111), further comprising:

and (3) gluing the surface of the battery cell (2) and/or the hole wall of the limiting hole (111), so that the battery cell (2) is adhered to the limiting hole (111) when being accommodated in the limiting hole (111).

4. The manufacturing process of the battery module according to claim 1, wherein the battery module further comprises a case before or after the battery cell (2) is accommodated in the limiting hole (111), and further comprises:

the cooling body (1) is installed in the box body.

5. The manufacturing process of the battery module according to any one of claims 1 to 4, wherein the cooling body (1) is foam-molded or injection-molded through a mold.

6. The battery module is characterized by comprising a cooling body (1) and a battery cell (2), wherein the cooling body (1) comprises a containing cavity and a limiting hole (111) which are communicated with each other, the battery cell (2) is contained in the containing cavity and is limited in the limiting hole (111), the cooling body (1) and the battery cell (2) form a flow channel (A), and the battery module is manufactured by adopting the manufacturing process of the battery module according to any one of claims 1-5.

7. The battery module according to claim 6, wherein the cooling body (1) comprises a base plate (11) and a frame (15) connected to the base plate (11), the limiting hole (111) is formed in the base plate (11), and the base plate (11) and the frame (15) form the accommodating cavity.

8. The battery module according to claim 7, wherein the cooling body (1) further comprises a plurality of support columns (12), the plurality of support columns (12) are arranged in the frame (15) and are in supporting connection with the base plate (11), the support columns (12) are arranged between adjacent battery cells (2), and the base plate (11), the support columns (12) and the periphery of the battery cells (2) form the flow channel (a).

9. The battery module according to claim 8, wherein the battery module comprises,

the cooling body (1) comprises a base plate (11), and the frame (15) and the support columns (12) are arranged at one end of the base plate (11); or (b)

The cooling body (1) comprises two base plates (11), and the frame (15) and the support columns (12) are arranged between the two base plates (11).

10. The battery module according to claim 8, wherein the cooling body (1) comprises a plurality of rows of the support columns (12) arranged along a first direction, each row of the support columns (12) comprises a plurality of the support columns (12) arranged at intervals along a second direction, two adjacent rows of the support columns (12) are arranged at intervals, and the support columns (12) and the battery cells (2) form a plurality of the flow channels (a) extending along the second direction.

11. The battery module according to claim 10, wherein the cooling body (1) is further provided with a main channel (13), the main channel (13) being provided between the end portions of the plurality of rows of the support columns (12) in the second direction and the frame (15), the main channel (13) being in communication with the plurality of flow passages (a).

12. The battery module according to claim 10, characterized in that the battery module comprises a current collector assembly (3), the current collector assembly (3) being connected to a side of the frame (15) facing away from the support column (12) in the second direction, the current collector assembly (3) being in communication with a plurality of the flow channels (a).

13. The battery module according to claim 10, wherein the side surface of the support column (12) in the second direction is provided with a profiling surface (121) adapted to the outer shape of the battery cell (2).

14. The battery module according to claim 10, wherein the battery module comprises,

the distance between two battery cores (2) positioned in two adjacent rows is not less than 1mm; and/or

The height of the runner (A) is not larger than the height of the battery cell (2); and/or

The contact area of the battery cell (2) and two adjacent support columns (12) along the second direction accounts for less than 40% of the surface area of the side wall of the battery cell (2).

15. The battery module according to claim 10, wherein the flow channel (a) is provided on a single side of the battery cell (2) in the first direction, or the flow channel (a) is provided on both sides of the battery cell (2) in the first direction.

16. The battery module according to any one of claims 10 to 15, wherein the cooling body (1) further comprises a separator (14), the separator (14) being disposed within the flow channel (a) and dividing the flow channel (a) into two branch channels (B) disposed in series.

17. The battery module according to claim 16, wherein the separator (14) is attached to the support column (12) at a middle position.

18. The battery module according to claim 16, wherein the separator (14) is adapted to the outer shape of the battery cell (2).

19. The battery module according to claim 16, wherein two of the branch passages (B) are provided on both sides of the separator (14) in the third direction.

20. The battery module according to any one of claims 10-15, wherein the cells (2) are cylindrical cells.

21. Battery module according to any of claims 10-15, characterized in that a glue layer is arranged between the limiting hole (111) and the cell (2) and/or the cell (2) is in interference fit with the limiting hole (111).

22. The battery module according to any one of claims 10 to 15, wherein the coolant is an insulating coolant.