CN114614165A

CN114614165A - Battery module

Info

Publication number: CN114614165A
Application number: CN202210234290.0A
Authority: CN
Inventors: 牟纳斯; 叶永煌; 戴晓汕; 徐守江; 冯春艳
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2018-11-21
Filing date: 2018-11-21
Publication date: 2022-06-10
Also published as: CN114784420A; CN114784420B; CN111211371B; CN111211371A; CN114784407A

Abstract

The invention discloses a battery module, which comprises a secondary battery and a heat exchange plate, wherein the heat exchange plate is arranged on the secondary battery; a plurality of secondary batteries stacked in a thickness direction; the heat exchange plate is clamped between any at least one pair of adjacent secondary batteries and comprises a body, a plurality of main pipelines and auxiliary pipelines, the body is provided with openings penetrating through the surfaces of the two opposite sides of the body, and the openings are used for forming a common channel together with openings on other components of the battery module; a plurality of main pipelines are arranged on the body, heat exchange media can flow in the main pipelines, and the main pipelines are used for exchanging heat with the secondary battery; the auxiliary pipeline is connected with the main pipeline and the opening. According to the battery module provided by the embodiment of the invention, the heat exchange medium in the heat exchange plate can be continuously supplied.

Description

Battery module

The invention is a divisional application provided by an invention patent application with the application number of 201811392428.X, the application date of 2018, 11, 21 and the name of 'heat exchange plate and battery module' of Ningde time New energy science and technology Limited company.

Technical Field

The invention relates to the field of batteries, in particular to a battery module.

Background

Battery modules are being widely used in the fields of automobiles and the like, and the related art battery modules generally integrate a plurality of secondary batteries, which generate a large amount of heat during charging and discharging due to internal resistance of the batteries, internal polarization, and the like. If the heat dissipation is not timely, the heat is accumulated, the temperature of the battery rises, the service life and the performance of the battery are influenced, and even the thermal runaway is caused to cause dangerous accidents. Meanwhile, when the ambient temperature is low, the battery needs to be heated to ensure the performance of the battery.

In order to ensure the charging and discharging stability of the secondary battery, the secondary battery needs to be in a proper and stable temperature environment, and therefore a matched heat exchange system is also needed in the battery module.

The soft package secondary battery of prior art fixes through the support generally and is in groups, and the support is plastics generally, and the heat conduction effect is poor, consequently can press from both sides between soft package secondary battery and establish the heat transfer board, heats or cools off secondary battery. However, when the soft package secondary battery is used, the soft package secondary battery may expand to a certain extent, and when the pipe on the heat exchange plate is too wide or protrudes too high relative to other parts of the heat exchange plate, the heat exchange pipe is crushed by the expanded secondary battery easily, which results in failure of the heat exchange plate and leakage of the heat exchange medium.

Therefore, a heat exchange plate with reasonable design is desired to ensure the effectiveness of the using process and have high heat exchange efficiency.

Disclosure of Invention

The invention provides a battery module, which can enable heat exchange media in a heat exchange plate to be supplied continuously.

The embodiment of the invention provides a battery module, which comprises a secondary battery and a heat exchange plate; a plurality of secondary batteries stacked in a thickness direction; the heat exchange plate is clamped between any at least one pair of adjacent secondary batteries and comprises a body, a plurality of main pipelines and auxiliary pipelines, the body is provided with openings penetrating through the surfaces of the two opposite sides of the body, and the openings are used for forming a common channel together with openings on other components of the battery module; a plurality of main pipelines are arranged on the body, heat exchange media can flow in the main pipelines, and the main pipelines are used for exchanging heat with the secondary battery; the auxiliary pipeline is connected with the main pipeline and the opening. .

According to one aspect of an embodiment of the invention, at least part of the edge of the body is provided with a raised structure.

According to an aspect of the embodiment of the present invention, a cross-sectional area of the main pipe perpendicular to an axial direction of the pipe is 2 mm or more.

According to an aspect of an embodiment of the present invention, at least two main conduits of the plurality of main conduits are different in length, wherein a cross-sectional area of a longer main conduit perpendicular to an axial direction of the conduit is larger than a cross-sectional area of a shorter main conduit perpendicular to the axial direction of the conduit.

According to an aspect of an embodiment of the present invention, at least two main pipes of the plurality of main pipes are different in length, and a length difference between any two main pipes is equal to or less than 25%.

According to an aspect of the embodiment of the present invention, the main pipe includes at least one circular arc-shaped corner section, and a ratio of a turning radius of the corner section to a width of the main pipe is 1.5 to 3.5.

According to an aspect of an embodiment of the present invention, the heat exchange plate further includes an insulating film covering a region of the body corresponding to the secondary battery.

According to an aspect of an embodiment of the present invention, the body further includes a connection part connecting adjacent main pipes, the main pipes protrude a predetermined height with respect to at least one side surface of the body, the predetermined height is 2 mm or less, and the width of the main pipes is 8 mm or less.

According to an aspect of the embodiment of the present invention, a ratio of the width of the connection portion to the width of the adjacent main pipe is 0.3 or more.

According to an aspect of an embodiment of the present invention, the battery module further includes a battery frame and a module end plate, and the openings of the other components of the battery module include an opening of the battery frame and an opening of the module end plate.

According to an aspect of an embodiment of the present invention, the body has two openings, which are oppositely disposed at both sides of the main duct, wherein one opening is used to form a common input channel in the battery module and the other opening is used to form a common output channel in the battery module.

According to the battery module provided by the embodiment of the invention, the heat exchange medium in the heat exchange plate can be continuously supplied.

The main pipeline protrudes for a preset height relative to at least one side surface of the main pipeline body so as to be convenient for heat exchange with the secondary battery and obtain higher heat exchange efficiency. Wherein the predetermined height is less than 2 mm, and the width of the main pipeline is less than 8 mm. Carry out reasonable design through the trunk line to the heat transfer board of the aforesaid, avoided the trunk line too wide or the relative body is protruding too high to further avoid the easy heat transfer board that the conquassation trunk line of secondary battery inflation brought to lose efficacy and heat transfer medium to reveal the problem, improve the use reliability of heat transfer board.

In some optional embodiments, at least part of the edge of the body is provided with a convex structure, so that the edge of the body of the heat exchange plate has higher strength and is not easy to deform, and the problem that the edge of the body is bent to puncture the secondary battery when being impacted is prevented.

Drawings

Other features, objects and advantages of the invention will become apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings in which like or similar reference characters refer to the same or similar parts.

Fig. 1 illustrates a perspective view of a battery module according to an embodiment of the present invention;

fig. 2 illustrates an exploded perspective view of a battery module according to an embodiment of the present invention;

FIG. 3 shows a side view of a heat exchanger plate according to an embodiment of the present invention;

FIG. 4 shows a cross-sectional view according to the direction AA in FIG. 3;

fig. 5 shows a cross-sectional view according to the direction BB in fig. 3.

In the figure:

100-heat exchange plates;

110-a body;

111-raised structures; 112-a connecting portion; 113-an opening;

120-a main pipeline;

121-corner section;

130-auxiliary pipe;

200-a secondary battery;

300-a battery frame;

400-module end plate;

500-a connector;

h-the preset height of the main pipeline protruding relative to the surface of the body;

w1-width of main conduit;

width of W2-connection;

r-radius of curvature of the corner section.

Detailed Description

Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

It will be understood that when a layer, region or layer is referred to as being "on" or "over" another layer, region or layer in describing the structure of the component, it can be directly on the other layer, region or layer or intervening layers or regions may also be present. Also, if the component is turned over, one layer or region may be "under" or "beneath" another layer or region.

The embodiment of the invention provides a battery module and a heat exchange plate, wherein the heat exchange plate is used for exchanging heat of a secondary battery in the battery module. The battery module according to the embodiment of the present invention and the heat exchange plate according to one embodiment thereof will be described in detail below.

Fig. 1 and 2 respectively show a perspective view and an exploded perspective view of a battery module according to an embodiment of the present invention, which includes secondary batteries 200 and a heat exchange plate 100, wherein a plurality of the secondary batteries 200 are stacked in a thickness direction, and the heat exchange plate 100 is interposed between any at least one pair of adjacent secondary batteries 200.

The battery module of this embodiment may further include a plurality of battery frames 300, the secondary battery 200 may be a pouch battery, the plurality of battery frames 300 are correspondingly disposed at the periphery of the plurality of secondary batteries 200, in this embodiment, the battery frames 300 are in one-to-one correspondence with the secondary batteries 200, and one heat exchange plate 100 may be sandwiched between every two adjacent battery frames 300, so that the heat exchange plate 100 is also sandwiched between every two adjacent secondary batteries 200, and the heat exchange plate 100 corresponds to the secondary batteries 200, so as to facilitate heat exchange of the secondary batteries 200.

The battery module may further include module end plates 400, the module end plates 400 being located at both ends in the stacking direction of the plurality of secondary batteries 200. The module end plates 400 at both ends may be connected to each other by the connection member 500 and clamp and fix the plurality of battery frames 300 and the heat exchange plate 100. The connection member 500 in the present embodiment may be a bolt, which penetrates the plurality of battery frames 300.

Fig. 3 shows a side view of a heat exchanger plate 100 according to an embodiment of the present invention. The heat exchanger plate 100 comprises a body 110 and a plurality of main conduits 120. A plurality of main pipes 120 are provided in the body 110, and a heat transfer medium can flow in the plurality of main pipes 120. In some embodiments, the heat exchange medium may be a low-temperature medium such as low-temperature water or a coolant for cooling the secondary battery 200, and in some embodiments, the heat exchange medium may be a high-temperature medium for heating the secondary battery 200. The heat exchange plate 100 of the present embodiment may be a cooling plate including a main pipe 120 through which a cooling medium may flow to cool the secondary battery 200.

Fig. 4 shows a cross-sectional view along AA in fig. 3, in the heat exchange plate 100 of the present embodiment, the main conduit 120 protrudes to a predetermined height H relative to at least one side surface of the body 110, wherein the predetermined height H is 2 mm or less, and the width W1 of the main conduit 120 is 8 mm or less. In this embodiment, the main pipe 120 protrudes a predetermined height H from both sides of the main body 110, and in other embodiments, the main pipe 120 may protrude from only one side of the main body 110.

According to the battery module of the embodiment of the present invention and the heat exchange plate 100 described above, the main duct 120 protrudes by a predetermined height H with respect to at least one side surface of the body 110 to facilitate heat exchange with the secondary battery 200, wherein the predetermined height H is 2 mm or less, and the width W1 of the main duct 120 is 8 mm or less. Through the reasonable design is carried out to trunk line 120 of heat transfer board 100 to the aforesaid, avoided trunk line 120 too wide or relative body 110 protruding too high to further avoid secondary battery 200 to take place the heat transfer board that inflation conquassation trunk line 120 brought in the use and lose efficacy and the heat transfer medium problem of revealing, improve the use reliability of heat transfer board 100 and battery module.

In some embodiments, the heat exchange plate 100 further includes an insulating film (not shown) covering a region of the body 110 corresponding to the secondary battery 200, so as to prevent the secondary battery 200 from being electrically leaked and transmitted to the outside of the battery module through the heat exchange plate 100, thereby preventing the safety of the battery module from being affected.

In the present embodiment, the body 110 of the heat exchange plate 100 is opened with openings 113 penetrating through two opposite side surfaces thereof. The heat exchange plate 100 further includes a sub pipe 130, and the sub pipe 130 connects the main pipe 120 with the opening 113, thereby forming a flow path of the heat exchange medium.

In some embodiments, the ratio of the pipe diameter of the main pipe 120 to the pipe diameter of the auxiliary pipe 130 of the heat exchange plate 100 is 1 to 2.5. If above-mentioned ratio is too big, then the pipe diameter undersize that is used for business turn over heat transfer medium's auxiliary pipeline 130, the flow resistance is too big, for guaranteeing heat exchange efficiency, need provide great system power, causes the system energy consumption to increase, need design very long changeover portion simultaneously between auxiliary pipeline 130 to trunk line 120 in order to avoid runner pipe diameter to enlarge flow problems such as backward flow, swirl that bring rapidly, reduces heat exchange efficiency. If the ratio is too small, the pipe diameter of the auxiliary pipeline 130 is too large, so that the whole auxiliary pipeline 130 occupies a large space, the occupied space of the opening 113 is increased, the occupied space and the weight of the whole pipeline of the system are increased, and the energy density of the system is reduced. By controlling the ratio of the pipe diameter of the main pipe 120 to the pipe diameter of the auxiliary pipe 130 in the range of 1 to 2.5, a superior effect can be obtained under the condition of balancing the flow resistance of the heat exchange medium, the heat exchange efficiency of the heat exchange plate 100 and the energy density of the system.

In the heat exchange plate 100 of the present embodiment, the body 110 may be divided into a heat exchange region corresponding to the secondary battery 200 and an open region, and the main duct 120 is disposed in the heat exchange region. The opening area is adjacent to the heat exchange area, the opening 113 is disposed in the opening area, and the opening 113 is used to form a common channel together with openings on other components of the battery module when the battery module is assembled, where the common channel may be a common input channel used to convey a heat exchange medium to each heat exchange plate 100, or a common output channel used to collect and convey the heat exchange medium that completes heat exchange in each heat exchange plate 100 to the outside.

In this embodiment, the body 110 has two opening regions, two opening regions may be oppositely disposed at two sides of the heat exchange region, one of the opening regions is used to form a common input channel in the battery module, and correspondingly, the auxiliary pipe 130 connected to the opening 113 in the opening region is used to input the heat exchange medium to the main pipe 120 of the heat exchange plate 100. Another open region of the body 110 is used to form a common output passage in the battery module, and accordingly, the auxiliary duct 130 connected to the opening 113 in the open region is used to output the heat exchange medium outward from the main duct 120 of the heat exchange plate 100.

It is understood that the above partitions on the body 110 of the heat exchange plate 100 are only an example, and the number and positions of the openings 113 on the body 110 can be adjusted accordingly according to the actual heat exchange needs and the design of the battery module.

In this embodiment, the battery frame 300 and the module end plate 400 may also have openings, respectively, wherein the opening of the battery frame 300 and the opening of the module end plate 400 correspond to the opening 113 on the heat exchange plate 100, when the module end plate 400, the heat exchange plate 100, and the battery frame 300 are stacked, clamped, and fixed together to assemble a battery module, the corresponding opening of the battery frame 300, the opening 113 of the heat exchange plate 100, and the opening of the module end plate 400 form a common channel, and the common channel may be a common input channel for conveying a heat exchange medium to each heat exchange plate 100, or a common output channel for collecting and conveying the heat exchange medium that has completed heat exchange in each heat exchange plate 100 to the outside.

In this embodiment, the heat exchange plate 100 has two openings 113, and the battery frame 300 and the module end plate 400 may also have two openings respectively, and the positions of the openings 113 of the heat exchange plate 100 correspond to each other. Therefore, one set of the openings of the corresponding battery frame 300, the openings 113 of the heat exchange plates 100 and the openings of the module end plates 400 form a common input channel, and the other set of the openings of the corresponding battery frame 300, the openings 113 of the heat exchange plates 100 and the openings of the module end plates 400 form a common output channel, so that the heat exchange medium in the heat exchange plates 100 can be continuously supplied.

It is understood that the number and positions of the battery frame 300, the module end plate 400 and the openings 113 on the heat exchange plate 100 are only examples, and in other embodiments, the number and positions can be adjusted according to the actual heat exchange requirement and the design of the battery module.

Fig. 5 shows a cross-sectional view according to the direction BB in fig. 3, in the heat exchanger plate 100 of the present embodiment, at least part of the edge of the body 110 is provided with a raised structure 111. Specifically, the body 110 is substantially rectangular, wherein the protruding structure 111 may be provided at a bottom edge of the body 110, and further, the protruding structure 111 may be provided at both side surfaces of the body 110.

According to the heat exchange plate 100 and the battery module of the embodiment of the invention, the raised structure 111 is arranged on at least part of the edge of the body 110 of the heat exchange plate 100, so that the edge of the body 110 of the heat exchange plate 100 has higher strength and is not easy to deform, and the problem that the edge of the body 110 is bent to puncture the secondary battery 200 when being impacted is prevented.

In some embodiments, the cross-sectional area of the main conduit 120 perpendicular to the axial direction of the conduit is more than 2 square millimeters to reduce the flow resistance and improve the heat dissipation efficiency.

Referring to fig. 3 and 4, the body 110 of the heat exchange plate 100 includes a connecting portion 112, and the connecting portion 112 connects adjacent main conduits 120. In some embodiments, the ratio of the width W2 of the connecting portion 112 to the width W1 of the adjacent main pipe is greater than or equal to 0.3, so as to ensure that a sufficiently wide connecting portion 112 is provided between the adjacent main pipes 120 and ensure sealing performance. The ratio of the width W2 of the connecting portion 112 to the width W1 of the adjacent main pipe 120 is smaller than the above numerical value, and the heat exchange medium in the main pipe 120 impacts the connecting portion 112 when flowing, so that the connecting portion 112 is torn, the problems of liquid leakage, uneven heat exchange and the like are caused, and the heat exchange efficiency and the safety performance of the module are influenced.

In some embodiments, at least two main pipes 120 of the plurality of main pipes 120 have different lengths, and when the lengths of the main pipes 120 are different, the cross-sectional area of the longer main pipe 120 perpendicular to the axial direction of the pipe is larger than the cross-sectional area of the shorter main pipe 120 perpendicular to the axial direction of the pipe, so as to realize the homogenization of the flow resistance of the main pipes 120 having different lengths and ensure the consistency of the heat exchange efficiency of all the positions of the heat exchange plate 100.

In some embodiments, at least two main conduits 120 of the plurality of main conduits 120 have different lengths, and a length difference between any two main conduits 120 is less than or equal to 25%, where the length difference between any two main conduits 120 is less than or equal to 25% refers to: the length of the longer main conduit 120 is less than or equal to 125% of the length of the shorter main conduit 120. When there are main conduits 120 having different lengths among the plurality of main conduits 120, if the length difference is within the above-mentioned 25%, that is, the length difference of the main conduits 120 is within a predetermined range, then the cross-sectional areas of the main conduits 120 perpendicular to the conduit axial direction are close and have better flow uniformity. If the length difference exceeds 25%, the flow uniformity of the heat exchange medium needs to be ensured by adjusting the cross-sectional area of the main pipe 120 perpendicular to the axial direction of the pipe, and at the moment, the cross-sectional area of the main pipe 120 perpendicular to the axial direction of the pipe needs to have large difference, so that the uniform arrangement is difficult and the design is complex.

In addition, the main pipe 120 may further include at least one corner section 121 having a circular arc shape, wherein if the turning radius R of the corner section 121 is too small, the flow resistance at the corner section 121 is large, and the heat exchange medium is likely to form a vortex or a flow dead zone at the corner section 121, which affects the heat exchange efficiency. The ratio of the turning radius R of the corner section 121 to the width W1 of the main pipe 120 is 1.5 to 3.5 in this embodiment, so as to ensure that the flow resistance can be reduced to a suitable range, and the heat exchange efficiency is improved.

In accordance with the above-described embodiments of the present invention, these embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A battery module, comprising:

a secondary battery (200), a plurality of the secondary batteries (200) being stacked in a thickness direction; and

a heat exchange plate (100), the heat exchange plate (100) press from both sides and locate arbitrary at least one pair of adjacent between secondary battery (200), heat exchange plate (100) includes:

the battery module comprises a body (110), wherein the body (110) is provided with openings (113) penetrating through two opposite side surfaces of the body, and the openings (113) are used for forming a common channel together with openings on other components of the battery module;

a plurality of main pipes (120) provided to the body (110), wherein a heat exchange medium can flow through the plurality of main pipes (120), and the main pipes (120) are used for exchanging heat with the secondary battery (200);

and a secondary duct (130), the secondary duct (130) connecting the primary duct (120) with the opening (113).

2. The battery module according to claim 1, wherein at least a portion of the edge of the body (110) is provided with a raised structure (111).

3. The battery module according to claim 1, wherein a cross-sectional area of the main pipe (120) perpendicular to the pipe axial direction is 2 mm or more.

4. The battery module according to claim 1, wherein at least two of the main pipes (120) of the plurality of main pipes (120) have different lengths, wherein a cross-sectional area of the longer main pipe (120) perpendicular to a pipe axial direction is larger than a cross-sectional area of the shorter main pipe (120) perpendicular to a pipe axial direction.

5. The battery module according to claim 1, wherein at least two main conduits (120) of the plurality of main conduits (120) have different lengths, and the difference in length between any two main conduits (120) is less than or equal to 25%.

6. The battery module according to claim 1, wherein the main duct (120) comprises at least one rounded corner segment (121), the ratio of the turning radius (R) of the corner segment (121) to the width (W1) of the main duct (120) being 1.5 to 3.5.

7. The battery module according to claim 1, wherein the heat exchange plate (100) further comprises an insulating film covering a region of the body (110) corresponding to the secondary battery (200).

8. The battery module according to claim 1, wherein a ratio of a pipe diameter of the main pipe (120) to a pipe diameter of the subsidiary pipe (130) is 1 to 2.5.

9. The battery module according to claim 1, wherein the body (110) further comprises a connecting portion (112), the connecting portion (112) connects adjacent main pipes (120), the main pipes (120) protrude a predetermined height (H) with respect to at least one side surface of the body (110), the predetermined height (H) is 2 mm or less, and the width (W1) of the main pipes (120) is 8 mm or less.

10. The battery module according to claim 9,

the ratio of the width (W2) of the connecting part (112) to the width (W1) of the adjacent main pipe (120) is greater than or equal to 0.3.

11. The battery module according to claim 1, wherein the battery module further comprises a battery frame (300) and a module end plate (400), and the openings of the other components of the battery module comprise: openings for the battery frame (300) and openings for the module end plates (400).

12. The battery module according to claim 1, wherein the body (110) has two openings (113), the two openings (113) being oppositely disposed at both sides of the main duct (120), one of the openings (113) being for forming a common input channel in the battery module, and the other opening (113) being for forming a common output channel in the battery module.