WO2024082824A1

WO2024082824A1 - Battery module, battery pack and electric device

Info

Publication number: WO2024082824A1
Application number: PCT/CN2023/115189
Authority: WO
Inventors: 罗峥; 席兵荣
Original assignee: 欣旺达动力科技股份有限公司
Priority date: 2022-10-20
Filing date: 2023-08-28
Publication date: 2024-04-25
Also published as: CN218788414U

Abstract

Disclosed are a battery module, a battery pack and an electric device. The battery module comprises a liquid cooling plate and a battery cell. The liquid cooling plate is provided with at least one cooling bent part, and each cooling bent part comprises at least one main cooling section, at least one auxiliary cooling section and at least one corner section; each pair of adjacent main cooling section and auxiliary cooling section is connected by means of one corner section; at least one main cooling section and at least one auxiliary cooling section are connected by means of the corner section and define at least one cooling cavity; a single cooling cavity is used for accommodating one or more battery cells; the corner section is provided with an inner bent surface close to the cooling cavity and an outer bent surface away from the cooling cavity, the inner bent surface is recessed in the direction towards the outer bent surface, and the outer bent surface protrudes towards the side away from the inner bent surface. According to the present application, forming the cooling bent part by means of bending is easier, and the processing difficulty and the preparation cost are reduced.

Description

Battery modules, battery packs and power-consuming devices

This application claims priority to the Chinese patent application filed with the China Patent Office on October 20, 2022, with application number 202222773163.6 and title “Battery Module and Battery Pack”, the entire contents of which are incorporated by reference into this application.

Technical Field

The embodiments of the present application relate to but are not limited to battery modules, battery packs and electrical devices.

Background technique

Power batteries are widely used in electric bicycles, electric motorcycles, electric vehicles and other electrical equipment. During the operation of electrical equipment, the battery cells in the battery will generate heat, and a liquid cooling plate is needed to dissipate heat and cool the battery cells in the battery. In addition to effectively dissipating heat from the battery cells, the reasonable arrangement of the battery cells must also be considered to increase the energy density of the battery module. Therefore, the liquid cooling plate needs to be set in a bent shape. During the preparation process, due to the rigidity of the liquid cooling plate, its preparation difficulty and cost are relatively high.

Technical Solutions

The present application provides a battery module, a battery pack and an electrical device to reduce the difficulty of processing a liquid cooling plate and prevent the liquid cooling plate from being crushed during the preparation process.

In a first aspect, an embodiment of the present application provides a battery module, comprising: a liquid cooling plate and a battery cell, wherein the liquid cooling plate has at least one cooling bend, each of the cooling bends comprises at least one main cooling segment, at least one auxiliary cooling segment and at least one angle segment, adjacent main cooling segments and auxiliary cooling segments are connected via an angle segment, at least one main cooling segment and at least one auxiliary cooling segment are connected via the angle segment to enclose at least one cooling cavity, and a single cooling cavity is used to accommodate one or more battery cells;

The angled section has an inner curved surface close to the cooling cavity and an outer curved surface away from the cooling cavity, the inner curved surface is concave in a direction toward the outer curved surface and the outer curved surface is convex toward a side away from the inner curved surface.

In some embodiments, the angled section includes a transition zone connected to the primary cooling section and the secondary cooling section and a recessed zone connected between the transition zones, wherein the arc curvature of the transition zone is greater than the arc curvature of the recessed zone. Rate.

In some embodiments, a thickness H ₁ of the angled section is smaller than a thickness H ₂ of the main cooling section.

In some embodiments, the thickness H ₁ of the angled section is smaller than the thickness H ₃ of the auxiliary cooling section.

In some embodiments, the difference between the thickness _H1 of the angle section and the thickness _H2 of the main cooling section is x, where 0<x≤10 mm.

In some embodiments, the difference between the thickness _H1 of the angled section and the thickness _H3 of the auxiliary cooling section is x, where 0<x≤10 mm.

In some embodiments, the thickness dimension of the angled section is equal to the thickness dimension of the main cooling section.

In some embodiments, the thickness H ₁ of the angled section is equal to the thickness H ₃ of the secondary cooling section.

In some embodiments, the angled section is extruded so that the inner curved surface is concave in a direction toward the outer curved surface and the outer curved surface is convex toward a side away from the inner curved surface.

In some embodiments, the inner curved surface is recessed in a direction toward the outer curved surface, so that when the battery cell is accommodated in the cooling cavity and fits both the main cooling section and the auxiliary cooling section, a gap is formed between the inner curved surface and the battery cell.

In some embodiments, at least one of the primary cooling section and the secondary cooling section of each cooling bend is provided with a filling layer on the inner side.

In some embodiments, the filling layer includes at least one of an elastic layer, a thermal conductive layer, and an insulating layer.

In some embodiments, the liquid cooling plate has a plurality of cooling bends connected to each other, and the openings of the cooling cavities of two adjacent cooling bends are opposite.

In some embodiments, each cooling bend includes two main cooling sections, one auxiliary cooling section and two angle sections, the two main cooling sections are arranged opposite to each other, the two ends of the auxiliary cooling section are respectively connected to one of the angle sections, one end of the angle section away from the auxiliary cooling section is connected to one of the main cooling sections, and two adjacent cooling bends share one main cooling section.

In some embodiments, the cooling bend is "U" shaped.

In a second aspect, an embodiment of the present application provides a battery pack, comprising a battery case and a battery module as described above, wherein the battery module is installed in the battery case.

In a third aspect, an embodiment of the present application provides an electrical device, comprising a battery pack as described above, wherein the battery pack provides electrical energy for the electrical device.

In the present application, an inner curved surface is arranged at the angle section of the liquid cooling plate along the direction toward the outer curved surface. The inner curved surface is concave in the outer direction and the outer curved surface is formed corresponding to the inner curved surface. The formation of the inner curved surface can relatively weaken the rigidity of the liquid cooling plate, which is beneficial to the preparation of the final liquid cooling plate structure, reduces the processing difficulty, reduces the risk of the liquid cooling plate being crushed during the preparation process, and improves the preparation yield of the liquid cooling plate; at the same time, based on the formation of the inner curved surface, when the battery cell is accommodated in the cooling cavity and fits with the main cooling section and the auxiliary cooling section, a gap is formed between the inner curved surface and the battery cell, so that the battery cell can avoid rigid contact between the edges and corners of the battery cell and the angled section during assembly, so as to reduce the collision between the two after being subjected to force and prevent the risk of failure of the battery cell.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a perspective view of a battery module provided according to an embodiment of the present application;

FIG2 is an exploded view of a battery module provided according to an embodiment of the present application;

FIG3 is a top view of a battery module provided according to an embodiment of the present application;

FIG4 is a partial cross-sectional view of a battery module provided according to an embodiment of the present application;

FIG5 is a structural view of a cooling bent portion provided according to an embodiment of the present application;

FIG6 is a schematic diagram of the structure of a liquid cooling plate to be bent;

7 is a schematic diagram of the cooperation between the liquid cooling plate and the battery in the battery module provided in the second embodiment of the present application;

FIG. 8 is a top view of a battery pack provided according to an embodiment of the present application.

Embodiments of the present application

The present application provides a battery module, a battery pack and an electric device, and the present application is further described in detail below with reference to the accompanying drawings and examples. It can be understood that the specific embodiments described here are only used to explain the present application and are not used to limit the present application.

Currently in battery modules, the liquid cooling plate needs to consider the reasonable arrangement of the battery cells while effectively dissipating the heat of the battery cells to improve the energy density of the battery module. Therefore, the liquid cooling plate needs to be set into a bent shape, which will cause the liquid cooling plate structure to be complex and thus increase the difficulty of the liquid cooling plate production process. At the same time, when the liquid cooling plate and the battery cells are assembled, interference and collision are likely to occur between the battery cells and the liquid cooling plate, resulting in damage to the battery cells and then failure of the battery cells.

The embodiment of the present application provides a battery module, wherein FIG1 shows a schematic structural diagram of the battery module, FIG2 shows an exploded structural diagram of the battery module, FIG3 shows a top view of the battery module, and FIG4 shows a partial cross-sectional view of the battery module.

In the embodiment of the present application, as shown in FIG. 1 to FIG. 4 , the battery module may include: a liquid cooling plate 1 and battery cells 2, the liquid cooling plate 1 having at least one cooling bend 11, each of the cooling bends 11 comprising at least one main cooling segment 111, at least one auxiliary cooling segment 112 and at least one angle segment 113, adjacent main cooling segments 111 and auxiliary cooling segments 112 are connected via an angle segment 113, a main cooling segment 111 and an auxiliary cooling segment 112 are connected via the angle segment 113 to form a cooling cavity 114, and a single cooling cavity 114 is used to accommodate one or more battery cells 2.

It can be understood that when the number of the main cooling section 111, the auxiliary cooling section 112 and the angle section 113 is more than one, they are connected to form a plurality of cooling cavities 114. That is, at this time, the liquid cooling plate 1 has a plurality of cooling bends 11, and the main cooling section 111 and the auxiliary cooling section 112 are sequentially connected to form a plurality of U-shaped cooling cavities 114, and the openings of two adjacent cooling cavities 114 are opposite.

The U-shaped cooling cavity 114 can also be understood as: one cooling cavity 114 includes two main cooling sections 111 and one auxiliary cooling section 112 enclosing a U-shaped structure, and any two adjacent U-shaped cooling cavities 114 share one main cooling section 111 .

In an embodiment of the present application, referring to Figure 3, the angle section 113 has an inner curved surface 1131 close to the cooling cavity 114 and an outer curved surface 1132 away from the cooling cavity 114, the inner curved surface 1131 is recessed in a direction toward the outer curved surface 1132, and the outer curved surface 1132 is convex toward a side away from the inner curved surface 1131 to form the angle section 113.

Please refer to FIG. 3 and FIG. 5 , in some specific embodiments, the angled section 113 includes a transition zone 1133 connected to the primary cooling section 111 and the secondary cooling section 112 and a recessed section 1134 connected between the transition zones 1133, and the arc curvature of the transition zone 1133 is greater than the arc curvature of the recessed section 1134, so as to facilitate the formation of a structure in which the angled section 113 is convex outward. That is, the transition between the transition zone 1133 and the recessed section 1134 is a non-smooth transition.

Please further refer to FIG. 6, which is a schematic diagram of the structure of the pre-bent structure 113a obtained by pre-extruding the liquid cooling plate 1a to be processed before forming the angle section 113. The inner surface near the cooling cavity 114 is pressed and recessed toward the outer surface to obtain the pre-bent structure 113a, so as to further prepare for the final bending to form the liquid cooling plate 1. The pre-bent structure 113a is further bent to obtain the liquid cooling plate 1, forming the angle section 113, and the angle section 113 of the final liquid cooling plate 1 basically maintains the shape of the pre-bent structure 113a. By setting the pre-bent structure 113a, the rigidity of the bending part can be reduced, and the difficulty of preparing the liquid cooling plate 1 can be reduced.

Optionally, the angled section 113 has a smaller thickness than the main cooling section 111 .

It can be understood that the inner curved surface 1131 on the angled section 113 in the present application is along the direction toward the outer curved surface The direction of 1132 is recessed so that the angle section 113 has a smaller thickness than the main cooling section 111, thereby changing the cross-section of the liquid cooling plate 1 at the angle section 113 to form a variable cross-section structure in the thickness direction, thereby making it easier to form the liquid cooling plate 1, reducing the difficulty of forming the liquid cooling plate 1, and making the cross-section of the liquid cooling plate 1 at the angle section 113 smaller, the thickness thinner, and the rigidity lowered, making it easier to bend to form the cooling curved portion 11, reducing the processing difficulty and preparation cost.

Optionally, the thickness _H1 of the angled section 113 may be uniform or non-uniform. When it is a structure with uniform thickness, the thickness difference between the angled section 113 and the primary cooling section 111 and the secondary cooling section 112 is fixed. If it is not a structure with uniform thickness, the thickness difference is a range value rather than single point data.

Usually, the thickness _H3 of the auxiliary cooling section 112 of the liquid cooling plate 1 is consistent with the thickness _H2 of the main cooling section 111. Even if they are inconsistent, it is due to a small thickness difference caused by processing. Therefore, the angle section 113 also has a smaller thickness than the auxiliary cooling section 112.

Specifically, the thickness difference between the angled section 113 and the main cooling section 111 is x, where 0<x≤10mm. Or the thickness difference between the angled section 113 and the main cooling section 111 can be controlled within 2-4mm, 2.5-3mm, 4-6mm, or 6-9mm. For example, when the thickness difference between the angled section 113 and the main cooling section 111 is fixed, the thickness difference can be 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 7mm or 8mm. It should be noted that when the thickness dimension of the angled section 113 is not uniform, any value of the thickness difference within the range of 2-4mm, 2.5-3mm, 4-6mm, or 6-9mm is within the protection scope of this application. It is worth noting that the specific numerical value of the thickness difference is only given as an example, and any value of the thickness difference within the range of 0-10mm is within the protection scope of this application.

In the present application, the thickness difference between the angle section 113 and the main cooling section 111 is controlled within the range of 0-10 mm, so that the liquid cooling plate 1 is easier to form and the difficulty of forming the liquid cooling plate 1 is reduced. At the same time, the rigidity of the liquid cooling plate 1 at the angle section 113 is ensured, and the strength of the liquid cooling plate 1 is ensured.

Specifically, the thickness difference between the angled section 113 and the auxiliary cooling section 112 is x, where 0<x≤10 mm. Alternatively, the thickness difference between the angled section 113 and the auxiliary cooling section 112 can be controlled within a range of 2 to 10 mm. 4mm, 2.5-3mm, 4-6mm, or 6-9mm. For example, when the thickness difference between the angle section 113 and the auxiliary cooling section 112 is fixed, the thickness difference can be 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 7mm or 8mm. It should be noted that when the thickness dimension of the angle section 113 is not uniform, the thickness difference is 2-4mm, 2.5-3mm, 4-6mm, or 6-9mm. Any value within the range is within the protection scope of the present application. It is worth noting that the specific numerical value of the thickness difference is only given as an example, as long as the thickness difference is within the range of 0-10mm, it is within the protection scope of the present application.

In an embodiment of the present application, the inner curved surface 1131 is recessed in a direction toward the outer curved surface 1132 , so that when the battery cell 2 is accommodated in the cooling cavity 114 and fits both the main cooling section 111 and the auxiliary cooling section 112 , a gap is formed between the inner curved surface 1131 and the battery cell 2 .

It can be understood that the inner curved surface 1131 in the present application is recessed in the direction toward the outer curved surface 1132, so that when the battery cell 2 is accommodated in the cooling cavity 114 and fits with both the main cooling section 111 and the auxiliary cooling section 112, a gap is formed between the inner curved surface 1131 and the battery cell 2, so that the battery cell 2 can avoid rigid contact between the corners of the battery cell 2 and the angle section 113 during assembly, so as to reduce the collision between the two after being subjected to force and prevent the risk of failure of the battery cell 2.

In the embodiment of the present application, referring to FIG. 2 , the battery cell 2 has two first surfaces 21 opposite to each other and a second surface 22 and a third surface 23 connected between the two first surfaces 21 , and the first surface 21 has a larger area than the second surface 22 and the third surface 23 of the battery cell 2 ; the battery cell 2 is accommodated in a corresponding one of the cooling cavities 114 , so that at least one of the first surfaces 21 of the battery cell 2 is directly or indirectly attached to the main cooling section 111 ;

The cooling curved portion 11 of the liquid cooling plate 1 can accommodate one or more battery cells 2 .

When the cooling curved portion 11 accommodates multiple battery cells 2, the multiple battery cells 2 can be arranged in any manner. Specifically, for example, the first surfaces 21 of two adjacent battery cells 2 are arranged in close contact, and for example, the second surfaces 22 of two adjacent battery cells 2 are arranged in close contact, and for example, the third surfaces 23 of two adjacent battery cells 2 are arranged in close contact, and for example, the first surface 21 and the second surface 22 of two adjacent battery cells 2 are arranged in close contact, and for example, the first surface 21 and the third surface 23 of two adjacent battery cells 2 are arranged in close contact, and for example, the second surface 22 and the third surface 23 of two adjacent battery cells 2 are arranged in close contact, and for example, the above-mentioned multiple methods are mixed and arranged. This application does not make specific restrictions, and the staff can arrange according to the actual situation.

In the embodiment of the present application, when a plurality of battery cells 2 are accommodated in the cooling curved portion 11, two adjacent battery cells 2 are Elastic heat-insulating pads are arranged between the battery cells 2 to prevent heat from spreading between adjacent battery cells 2 when a single battery cell 2 has a thermal runaway problem.

2 , an edge 24 is formed at the junction of the first surface 21 and the second surface 22 and/or the third surface 23 . When the battery cell 2 is accommodated in the cooling cavity 114 and fits both the main cooling section 111 and the auxiliary cooling section 112 , a gap is formed between the inner curved surface 1131 and the edge 24 of the battery cell 2 .

It can be understood that in the present application, a gap is formed between the inner curved surface 1131 and the corner 24 of the battery cell 2, so that the corner 24 of the battery cell 2 can avoid rigid contact with the angle section 113 during assembly, so as to reduce the collision between the two after being subjected to force, and prevent the risk of failure of the battery cell 2; at the same time, the main cooling section 111, the auxiliary cooling section 112 and the battery cell 2 are in close contact, ensuring the contact and fit between the liquid cooling plate 1 and the battery cell 2, thereby improving the cooling effect of the liquid cooling plate 1.

In the embodiment of the present application, referring to FIG. 3 , the inner curved surface 1131 and the outer curved surface 1132 are both arc-shaped, and the arc curvature of the inner curved surface 1131 is greater than the arc curvature of the outer curved surface 1132 .

In the embodiment of the present application, referring to FIG. 4 , at least one of the main cooling section 111 and the auxiliary cooling section 112 of each cooling curved portion 11 is provided with at least one filling layer 115 of an elastic layer, a heat conductive layer and an insulating layer on the inner side.

Alternatively, the filling layer 115 is a single layer structure having at least one of elasticity, thermal conductivity, and insulation.

The inner side of the main cooling section 111 refers to a side of the main cooling section close to the battery cell 2 when the battery cell 2 is accommodated in the cooling cavity 114 .

The inner side of the auxiliary cooling section 112 refers to a side of the auxiliary cooling section 112 close to the battery cell 2 when the battery cell 2 is accommodated in the cooling cavity 114 .

Specifically, for example, at least one of the main cooling segment 111 and the auxiliary cooling segment 112 of each of the cooling curved portions 11 is provided with an elastic filling layer on the inner side to provide deformation space for deformation and expansion generated when the battery cell expands; for another example, at least one of the main cooling segment 111 and the auxiliary cooling segment 112 of each of the cooling curved portions 11 is provided with a heat conductive filling layer on the inner side to meet the heat conductivity requirements; for another example, at least one of the main cooling segment 111 and the auxiliary cooling segment 112 of each of the cooling curved portions 11 is provided with an insulating filling layer on the inner side to insulate the battery cell from the liquid cooling plate; for another example, at least one of the main cooling segment 111 and the auxiliary cooling segment 112 of each of the cooling curved portions 11 is provided with a filling layer with all the above functions on the inner side to achieve the corresponding functions.

Optionally, the filling layer 115 may be formed by processing the inner surface of the main cooling section 111 and the auxiliary cooling section 112, for example, spraying the inner surface of the main cooling section 111 and the auxiliary cooling section 112 with a material having the above-mentioned single function or the above-mentioned multiple functions to form the filling layer 115, or pasting the inner surface of the main cooling section 111 and the auxiliary cooling section 112 with a filling layer 115 having the above-mentioned single function or the above-mentioned multiple functions; it may also be formed by processing the surface of the battery cell 2, for example, spraying the surface of the battery cell 2 with a material having the above-mentioned single function or the above-mentioned multiple functions to form the filling layer 115, or pasting the surface of the battery cell 2 with a filling layer 115 having the above-mentioned single function or the above-mentioned multiple functions; it may also be formed by filling the material having the above-mentioned single function or the above-mentioned multiple functions between the main cooling section 111, the auxiliary cooling section 112 and the battery cell 2 to form the filling layer 115. There is no specific limitation in this application, as long as the above-mentioned functions can be achieved.

In the embodiment of the present application, referring to FIG. 1 and FIG. 2 , the liquid cooling plate 1 further comprises a liquid cooling circuit and a liquid inlet 12 and a liquid outlet 13 both of which are fluidically connected to the liquid cooling circuit, wherein the liquid inlet 12 is located on the upstream side of the coolant flow direction of the liquid cooling circuit, and the liquid outlet 13 is located on the downstream side of the coolant flow direction of the liquid cooling circuit;

The battery module also includes a main liquid inlet pipe and a main liquid outlet pipe. The liquid inlet 12 on each of the liquid cooling plates 1 is fluidically connected to the main liquid inlet pipe, and the liquid outlet 13 on each of the liquid cooling plates is fluidically connected to the main liquid outlet pipe.

Specifically, in the present application, a liquid cooling circuit, a liquid inlet 12 and a liquid outlet 13 are provided to form a circulating liquid cooling channel, so as to fill the interior of the liquid cooling plate 1 with cooling liquid to realize the cooling function of the liquid cooling plate; at the same time, the present application realizes synchronous control of multiple liquid cooling plates by providing a total liquid inlet pipe and a total liquid outlet pipe, thereby improving the cooling control efficiency of the liquid cooling plate.

The angled section 113 is formed by extrusion and then bending:

Please refer to FIG. 3 and FIG. 6 , specifically, in the present application, the main cooling section 111 and the auxiliary cooling section 112 are first pre-extruded or pre-bent into a structure 113a, and then the main cooling section 111 and the auxiliary cooling section 112 are bent to form an angled section 113 between the main cooling section 111 and the auxiliary cooling section 112. That is, the purpose of pre-extrusion is to first extrude or pre-bend the structure 113a of the liquid cooling plate 1, reduce the rigidity, and pre-bend, so as to perform pre-processing for further bending to finally form the angled section 113, which can well avoid the difficulty of directly bending the angled section 113.

Please refer to FIG. 7 . The second embodiment of the present application provides another battery module. The difference between the battery module and the battery module provided in the first embodiment lies in the structure of the liquid cooling plate 1b. The angle section 113b of the liquid cooling plate 1b is The thickness dimension is equal to the thickness dimension of the main cooling section 111 or the auxiliary cooling section 112.

Based on the fact that the angled section 11b is also provided with an inner curved surface 1131b close to the cooling cavity 114 and an outer curved surface 1132b away from the cooling cavity 114, the inner curved surface 1131b is recessed in a direction toward the outer curved surface 1132b, and the outer curved surface 1132b is convex toward a side away from the inner curved surface 1131b to form the angled section 113b, and a pre-bent structure is well obtained, which effectively reduces the stiffness of the liquid cooling plate 1b at the pre-bent structure and reduces the difficulty of preparation.

On the other hand, referring to FIG. 8 , the present application further provides a battery pack, comprising a battery case 3 and a battery module as described in any one of the above items, wherein the battery module is installed in the battery case 3 .

On the other hand, the present application further provides an electrical device, which includes the battery pack as described above, and the battery pack serves as a power supply for the electrical device.

Specifically, the electrical devices include electric vehicles, yachts, etc.

The battery module, battery pack and electrical device provided in the embodiments of the present application are introduced in detail above. Specific examples are used in the present application to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

A battery module, comprising: a liquid cooling plate (1) and a battery cell (2), wherein the liquid cooling plate (1) has at least one cooling bend (11), each cooling bend (11) comprises at least one main cooling section (111), at least one auxiliary cooling section (112) and at least one angle section (113), adjacent main cooling sections (111) and auxiliary cooling sections (112) are connected via an angle section (113), at least one main cooling section (111) and at least one auxiliary cooling section are connected via the angle section (113) to enclose at least one cooling cavity (114), and a single cooling cavity (114) is used to accommodate one or more battery cells (2);

The angled section (113) comprises an inner curved surface (1131) close to the cooling cavity (114) and an outer curved surface (1132) away from the cooling cavity (114); the inner curved surface (1131) is concave in a direction toward the outer curved surface (1132) and the outer curved surface (1132) is convex toward a side away from the inner curved surface (1131).
The battery module according to claim 1, wherein the angled section (113) comprises a transition zone (1133) connected to the main cooling section (111) and the auxiliary cooling section (112) and a recessed zone (1134) connected between the transition zones, and the arc curvature of the transition zone (1133) is greater than the arc curvature of the recessed zone (1134).
The battery module according to claim 2, wherein a thickness H1 of the angled section (113) is smaller than a thickness H2 of the main cooling section (111).
The battery module according to claim 2, wherein a thickness H1 of the angled section (113) is smaller than a thickness H3 of the auxiliary cooling section (112).
The battery module according to claim 3, wherein the difference between the thickness H1 of the angle section (113) and the thickness H2 of the main cooling section (111) is x, 0<x≤10 mm.
The battery module according to claim 4, wherein the difference between the thickness H1 of the angle section (113) and the thickness H3 of the auxiliary cooling section (112) is x, 0<x≤10 mm.
The battery module according to claim 1, wherein a thickness H1 of the angled section (113) is equal to a thickness H2 of the main cooling section (111).
The battery module according to claim 1, wherein a thickness H1 of the angled section (113) is equal to a thickness H3 of the auxiliary cooling section (112).
The battery module according to claim 1, wherein the angled section (113) is extruded so that the inner curved surface (1131) is concave in a direction toward the outer curved surface (1132) and the outer curved surface (1132) is convex toward a side away from the inner curved surface (1131).
The battery module according to claim 1, wherein the inner curved surface (1131) is recessed in a direction toward the outer curved surface (1132), so that when the battery cell (2) is accommodated in the cooling cavity (114) and is in contact with both the main cooling section (111) and the auxiliary cooling section (112), a gap is formed between the inner curved surface (1131) and the battery cell (2).
The battery module according to claim 1, wherein at least one of the main cooling section (111) and the auxiliary cooling section (112) of each cooling bent portion (11) is provided with a filling layer (115) on the inner side.
The battery module according to claim 11, wherein the filling layer (115) comprises at least one of an elastic layer, a thermal conductive layer, and an insulating layer.
The battery module according to claim 1, wherein the liquid cooling plate (1) has a plurality of cooling bends (11) connected to each other, and the openings of the cooling cavities (114) of two adjacent cooling bends (11) are opposite.
The battery module as claimed in claim 13, wherein each cooling bend (11) comprises two main cooling sections (111), one auxiliary cooling section (112) and two angle sections (113), the two main cooling sections (111) are arranged opposite to each other, and the two ends of the auxiliary cooling section (112) are respectively connected to one of the angle sections (113), and one end of the angle section (113) away from the auxiliary cooling section (112) is connected to one of the main cooling sections (111), and two adjacent cooling bends (11) share one of the main cooling sections (111).
The battery module according to claim 1, wherein the cooling curved portion (11) is in a "U" shape.
A battery pack comprises a battery case and the battery module as claimed in claim 1, wherein the battery module is installed in the battery case of the battery pack.
An electrical device, comprising the battery pack as claimed in claim 16, wherein the battery pack provides electrical energy for the electrical device.