Large-module heat dissipation structure

Abstract

The invention relates to a large-module heat dissipation structure, which comprises a plurality of battery cells arranged in at least two rows; the U-shaped heat conducting sheet is arranged around the outer side of each battery cell; and the liquid cooling plates are arranged on the two sides of each column of battery cells, and the liquid cooling plates are fixed on the side surfaces of the U-shaped heat-conducting fins. The U-shaped heat-conducting fins are arranged on the outer sides of the battery cells, the heat-conducting fins are in large-area contact with the side faces of the battery cells, so that the heat dissipation area of the battery cells is increased, compared with traditional bottom heat dissipation, the liquid cooling plates are arranged on the side faces of the battery cells, side face heat dissipation is achieved, the heat transfer path is changed, the heat transfer distance is shortened, and therefore the heat dissipation capacity of a system is greatly enhanced; therefore, the safety of the battery cell is improved, and the cycle life of the battery cell is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of battery cores, and in particular to a large module heat dissipation structure. Background Art

[0002] With the development of the industry, the capacity and energy density of single battery cells are getting larger and larger, and the demand for high-rate charging and discharging is increasing, and the corresponding heat generation of the battery cells is also increasing.

[0003] In the related technologies, the heat dissipation technology is bottom liquid cooling. The bottom liquid cooling plate has low heat exchange capacity, small liquid cooling heat dissipation surface, long heat transfer path, and correspondingly large heat transfer temperature gradient in the Z direction of the battery cell, which ultimately causes large temperature difference in the battery cell and temperature rise, affecting system safety and cycle life. Summary of the invention

[0004] Based on the above description, the present invention provides a large module heat dissipation structure to solve the problem of large temperature difference and temperature rise of battery cells in related technologies, which affects system safety and cycle life.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: a large module heat dissipation structure, which includes: a plurality of battery cells arranged in at least two rows; a U-shaped heat conductive sheet arranged around the outside of each of the battery cells; a liquid cooling plate arranged on both sides of each row of the battery cells, and the liquid cooling plate is fixed to the side of the U-shaped heat conductive sheet.

[0006] Based on the above technical solution, the present invention can also be improved as follows.

[0007] Furthermore, the liquid cooling plate includes a first liquid cooling plate arranged on the outside of the two columns of battery cells and a second liquid cooling plate arranged between the two columns of battery cells, the first liquid cooling plate is provided with a first water inlet, the second liquid cooling plate is provided with a second water inlet, and the first water inlet is smaller than the second water inlet.

[0008] Furthermore, a three-way solenoid valve is installed on the main water inlet pipe of the liquid cooling plate, a first outlet of the three-way solenoid valve is connected to the first water inlet through a first water inlet pipe, and a second outlet of the three-way solenoid valve is connected to the second water inlet through a second water inlet pipe.

[0009] Furthermore, a temperature sensing sheet is attached to the side of the liquid cooling plate, the temperature sensing sheet signal is connected to a controller, and the controller signal is connected to the three-way solenoid valve.

[0010] Furthermore, the first water inlet pipe is fixed to the first water inlet via a quick-connect connector or a clamp, and the second water inlet pipe is fixed to the second water inlet pipe via a quick-connect connector or a clamp.

[0011] Furthermore, end plates are fixed at both ends of the liquid cooling plate, and structural adhesive is coated between the battery core, the U-shaped heat conductive sheet, the liquid cooling plate and the end plates.

[0012] Furthermore, the liquid cooling plate and the end plate are fixed by blind rivets or bolts.

[0013] Furthermore, the end plate is provided with a hoisting hole and a positioning hole, the hoisting hole is located on both sides of the middle part of the end plate, and the positioning hole is located between the hoisting holes on both sides.

[0014] Furthermore, the end plate is provided with rivet holes, and the rivet holes are located at both ends of the outer side of the end plate.

[0015] Furthermore, the surface of the U-shaped heat conductive sheet is coated with insulating paint.

[0016] Compared with the prior art, the technical solution of this application has the following beneficial technical effects: By setting a U-shaped heat conductive sheet on the outside of the battery cell, the heat conductive sheet is in contact with a large area of ​​the side of the battery cell, thereby increasing the heat dissipation area of ​​the battery cell. Compared with the traditional bottom heat dissipation, by setting the liquid cooling plate on the side of the battery cell, side heat dissipation is achieved, the heat transfer path is changed, and the heat transfer distance is reduced, thereby greatly enhancing the heat dissipation capacity of the system, achieving the effect of reducing the battery cell temperature, thereby improving the safety and cycle life of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the overall structure of a large module heat dissipation structure provided by an embodiment of the present invention; Figure 2 A schematic diagram of a partial structure of a large module heat dissipation structure provided by an embodiment of the present invention; Figure 3 A schematic diagram of the structure of an end plate provided in an embodiment of the present invention; Figure 4 A schematic diagram of the structure of a liquid cooling plate provided in an embodiment of the present invention.

[0018] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. Battery cell; 2. U-shaped heat conductive sheet; 3. Liquid cooling plate; 301. First liquid cooling plate; 302. Second liquid cooling plate; 303. First water inlet; 304. Second water inlet; 4. End plate; 401. Lifting hole; 402. Positioning hole; 403. Rivet hole; 5. Three-way solenoid valve; 6. First water inlet pipe; 7. Second water inlet pipe; 8. Temperature sensor. DETAILED DESCRIPTION

[0019] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0020] The embodiment of the present invention provides a large module heat dissipation structure, which can solve the problems in the related art of large temperature difference of battery cells, high temperature rise, and impact on system safety and cycle life.

[0021] See also Figure 1 and Figure 2 As shown, a large module heat dissipation structure provided by an embodiment of the present invention comprises: a plurality of battery cells 1 arranged in at least two rows; a U-shaped heat conductive sheet 2 arranged around the outer side of each of the battery cells 1; a liquid cooling plate 3 arranged on both sides of the battery cells 1 in each row, and the liquid cooling plate 3 is fixed to the side of the U-shaped heat conductive sheet 2. In this embodiment, liquid cooling plates 3 are arranged on both sides of the battery cells 1 at the same time, and the liquid cooling plates 3 are extruded or stamped. A U-shaped heat conductive sheet 2 is arranged on the side of each battery cell 1, and the U-shaped heat conductive sheet 2 is in close contact with the side of the battery cell 1 and the large surface of the battery cell 1, and the side of the U-shaped heat conductive sheet 2 is in contact with the liquid cooling plate 3, thereby increasing the heat dissipation area of ​​the battery cell 1, realizing side heat dissipation, changing the heat transfer path, and reducing the heat transfer distance, thereby greatly enhancing the heat dissipation capacity of the system, achieving the effect of reducing the temperature of the battery cell, thereby improving the safety and cycle life of the battery cell.

[0022] See also Figure 2 As shown, in some embodiments, the liquid cooling plate 3 includes a first liquid cooling plate 301 disposed outside the two columns of the battery cells 1 and a second liquid cooling plate 302 disposed between the two columns of the battery cells 1, the first liquid cooling plate 301 is provided with a first water inlet 303, the second liquid cooling plate 302 is provided with a second water inlet 304, and the first water inlet 303 is smaller than the second water inlet 304. In this embodiment, the battery cells 1 can be arranged in 3 or more columns, with two second liquid cooling plates 302 in the middle and two first liquid cooling plates 301 on both sides, the first liquid cooling plate 301 and the second liquid cooling plate 302 are connected in parallel through a water pipe, and the inner diameters of the water inlets of the first liquid cooling plate 301 and the second liquid cooling plate 302 are different, so as to achieve the effect of controlling flow distribution, and ensure the consistency of the temperature of the battery cells 1 while reducing the temperature of the battery cells 1, thereby improving the cycle life of the system.

[0023] For details, see Figure 4The coolant flows from the liquid cooler through the water inlet pipe and flows into the liquid cooling plate flow channel from the water inlet of the first liquid cooling plate 301 and the second liquid cooling plate 302 respectively. The liquid cooling plate 3 is provided with multiple cavities in the middle and connected in a serpentine shape. Then the coolant flows out from the water outlet, converges into the water outlet pipe, and flows back to the liquid cooling plate 3. The liquid cooling plate 3 absorbs the heat emitted by the battery cell 1 when flowing through the serpentine cavity of the liquid cooling plate, thereby reducing the temperature of the battery cell 1. During the charging and discharging process, the heat emitted by the battery cell 1 is transferred to the liquid cooling plate 3 connected to the U-shaped heat conductive sheet 2 through the U-shaped heat conductive sheet 2. The circulating coolant absorbs this heat, thereby achieving the effect of reducing the temperature of the battery cell.

[0024] See also Figure 1 As shown, in some embodiments, a three-way solenoid valve 5 is installed on the main water inlet pipe of the liquid cooling plate 3, and the first outlet of the three-way solenoid valve 5 is connected to the first water inlet 303 through the first water inlet pipe 6, and the second outlet of the three-way solenoid valve 5 is connected to the second water inlet 304 through the second water inlet pipe 7. In this embodiment, by installing the three-way solenoid valve 5, the flow rate and speed of the cooling water entering the first liquid cooling plate 301 and the second liquid cooling plate 302 can be controlled, so that the side with a higher temperature can preferentially enter more cooling water, thereby better ensuring the consistency of the temperature of the battery cell 1 and improving the cycle life of the system.

[0025] See also Figure 4 As shown, in some embodiments, a temperature sensing sheet 8 is attached to the side of the liquid cooling plate 3, and the signal of the temperature sensing sheet 8 is connected to the controller, and the signal of the controller is connected to the three-way solenoid valve 5. In this embodiment, by setting the temperature sensing sheet 8, the temperature sensed by the temperature sensing sheet 8 is used to calculate and control the flow rate and speed of cooling water entering the liquid cooling plate 3 at different positions, thereby further reducing the temperature difference of the battery cell and improving the accuracy of temperature control.

[0026] See also Figure 2 As shown, in some embodiments, the first water inlet pipe 6 is fixed to the first water inlet 303 by a quick connector or a clamp, and the second water inlet pipe 7 is fixed to the second water inlet pipe 7 by a quick connector or a clamp. In this embodiment, water enters the lower end water inlet of the first liquid cooling plate 301 and the second liquid cooling plate 302, and water flows out from the upper end, and is connected in parallel through water pipes. The water pipes and the liquid cooling plate water inlets can be fixed with quick connectors or clamps to ensure the sealing performance of the connection and facilitate installation.

[0027] See also Figure 2As shown, in some embodiments, end plates 4 are fixed at both ends of the liquid cooling plate 3, and structural adhesive is coated between the battery cell 1, the U-shaped heat conductive sheet 2, the liquid cooling plate 3 and the end plate 4. In this embodiment, the thermal conductive structural adhesive is connected and fixed between the several parts, and the thermal conductive structural adhesive material can be polyurethane or silicone or other high-strength glue with high thermal conductivity. While improving the thermal conductivity efficiency, the entire module is connected as a whole, thereby strengthening the structural strength of the module during the expansion of the battery cell and improving the vibration resistance of the module.

[0028] See also Figure 2 As shown, in some embodiments, the liquid cooling plate 3 and the end plate 4 are fixed by means of blind rivets or bolts. In this embodiment, end plates 4 are arranged at both ends of the module, and the end plates 4 and the liquid cooling plate 3 are connected and fixed by rivets or bolts at both ends. At the same time, structural adhesive is coated between the end plate 4 and the liquid cooling plate 3 to further enhance the structural strength during the expansion of the battery cell.

[0029] See also Figure 3 As shown, in some embodiments, the end plate 4 is provided with a hoisting hole 401 and a positioning hole 402, the hoisting hole 401 is located at both sides of the middle of the end plate 4, and the positioning hole 402 is located between the hoisting holes 401 on both sides. The end plate 4 is provided with a rivet hole 403, and the rivet hole 403 is located at both ends of the outer side of the end plate 4. In this embodiment, by simultaneously providing the rivet hole 403, the positioning hole 402, and the hoisting hole 401 on the end plate 4, the rivet hole 403 is used for rivet fixing, the positioning hole 402 is used for installation and positioning, and the hoisting hole 401 is used for hoisting, so as to facilitate the assembly of the battery module.

[0030] See also Figure 2 As shown, in some embodiments, the surface of the U-shaped thermal conductive sheet 2 is coated with insulating paint. The U-shaped thermal conductive sheet is made of aluminum alloy, and the thickness is preferably between 0.5-1.2 mm. The surface is coated with insulating paint to ensure the insulation performance between the battery core 1 and the U-shaped thermal conductive sheet 2.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0032] It will be appreciated that spatial relationship terms such as "under," "beneath," "below," "under," "above," "above," etc., may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It will be appreciated that, in addition to the orientations shown in the figures, spatial relationship terms also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, an element or feature described as "under other elements" or "under it" or "under it" will be oriented as being "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0033] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element, or connected to the other element through an intermediate element. The "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0034] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" etc. specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A large module heat dissipation structure, characterized in that: It includes: A plurality of battery cells (1) arranged in at least two rows; A U-shaped heat conductive sheet (2) arranged around the outside of each battery core (1); A liquid cooling plate (3) is arranged on both sides of each row of the battery cells (1); the liquid cooling plate (3) is fixed to the side of the U-shaped heat conducting sheet (2).

2. The large module heat dissipation structure according to claim 1, characterized in that: The liquid cooling plate (3) comprises a first liquid cooling plate (301) arranged outside the two rows of battery cells (1) and a second liquid cooling plate (302) arranged between the two rows of battery cells (1); the first liquid cooling plate (301) is provided with a first water inlet (303); the second liquid cooling plate (302) is provided with a second water inlet (304); the first water inlet (303) is smaller than the second water inlet (304).

3. The large module heat dissipation structure according to claim 2, characterized in that: A three-way solenoid valve (5) is installed on the main water inlet pipe of the liquid cooling plate (3); a first outlet of the three-way solenoid valve (5) is connected to the first water inlet (303) via a first water inlet pipe (6); and a second outlet of the three-way solenoid valve (5) is connected to the second water inlet (304) via a second water inlet pipe (7).

4. The large module heat dissipation structure according to claim 3, characterized in that: A temperature sensing sheet (8) is attached to the side of the liquid cooling plate (3), the temperature sensing sheet (8) is signal-connected to a controller, and the controller is signal-connected to the three-way solenoid valve (5).

5. The large module heat dissipation structure according to claim 3, characterized in that: The first water inlet pipe (6) is fixed to the first water inlet (303) via a quick-connect connector or a clamp, and the second water inlet pipe (7) is fixed to the second water inlet pipe (7) via a quick-connect connector or a clamp.

6. The large module heat dissipation structure according to claim 1, characterized in that: End plates (4) are fixed at both ends of the liquid cooling plate (3), and structural adhesive is coated between the battery core (1), the U-shaped heat conducting sheet (2), the liquid cooling plate (3) and the end plates (4).

7. The large module heat dissipation structure according to claim 6, characterized in that: The liquid cooling plate (3) and the end plate (4) are fixed by means of blind rivets or bolts.

8. The large module heat dissipation structure according to claim 6, characterized in that: The end plate (4) is provided with a hoisting hole (401) and a positioning hole (402), wherein the hoisting hole (401) is located on both sides of the middle of the end plate (4), and the positioning hole (402) is located between the hoisting holes (401) on both sides.

9. The large module heat dissipation structure according to claim 6, characterized in that: The end plate (4) is provided with rivet holes (403), and the rivet holes (403) are located at two ends of the outer side of the end plate (4).

10. The large module heat dissipation structure according to claim 1, characterized in that: The surface of the U-shaped heat conducting sheet (2) is coated with insulating paint.

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