Liquid cooling plate, secondary battery and electric vehicle

Abstract

The utility model provides a liquid cooling plate, a secondary battery and an electric car, and belongs to the technical field of secondary batteries, the liquid cooling plate comprises a bottom liquid cooling plate, a cooling liquid channel is arranged in the bottom liquid cooling plate, and the cooling liquid channel is provided with a cooling liquid inlet and a cooling liquid outlet; the heat dissipation liquid flows in the cooling liquid channel to dissipate heat; the heat conducting plate is vertically connected with the surface of the bottom liquid cooling plate; the heat conduction plate can transfer heat to the bottom liquid cooling plate. By using the novel liquid cooling plate, the bottom cooling is effectively utilized, meanwhile, the heat conduction plate is arranged on the large surface of the battery cell, the heat dissipation efficiency of the battery cell is improved, and meanwhile, the battery cell can be restrained to a certain extent and the expansion of the battery cell can be inhibited by the arrangement mode.

Description

TECHNICAL FIELD

[0001] The utility model belongs to secondary battery technical field, especially related to liquid cooling plate, secondary battery and electric car. BACKGROUND

[0002] In order to keep the consistency of battery temperature, the existing technology realizes the reasonable control to the temperature of electric core through natural cooling, forced air cooling, liquid cooling and other ways, wherein the liquid cooling heat dissipation mode is often used in the thermal management system of whole vehicle, and it is an effective heat dissipation mode, which can better control the temperature of electric core in the battery module system of whole vehicle.

[0003] After the heat runaway of battery, if the heat runaway cannot be stopped, the disaster that cannot be imagined will occur.

[0004] Therefore, a liquid cooling plate that can quickly dissipate heat and prevent battery fire and a secondary battery using the liquid cooling plate are urgently needed. INVENTION CONTENTS

[0005] In view of the above problems, the utility model provides a liquid cooling plate, and the bottom cooling is effectively utilized by using the liquid cooling plate, and the heat dissipation efficiency of electric core is improved by arranging the heat conduction plate on the large face of electric core, and the arrangement mode can restrain the expansion of electric core to a certain extent.

[0006] In order to realize the above purpose, the utility model adopts the following technical scheme:

[0007] A liquid cooling plate comprises:

[0008] A bottom liquid cooling plate is internally provided with a cooling liquid channel, and a cooling liquid inlet and a cooling liquid outlet are arranged on the cooling liquid channel; heat dissipation is realized by the flow of heat dissipation liquid in the cooling liquid channel;

[0009] A heat conduction plate is vertically connected with the surface of the bottom liquid cooling plate; the heat conduction plate can transmit heat to the bottom liquid cooling plate.

[0010] Further, a first fire extinguishing channel is internally arranged in the bottom liquid cooling plate, the first fire extinguishing channel is arranged on both sides of the cooling liquid channel, and two first fire extinguishing medium inlets are arranged on the first fire extinguishing channel; the two first fire extinguishing medium inlets are respectively arranged on both sides of the cooling liquid inlet and the cooling liquid outlet;

[0011] A second fire extinguishing channel is internally arranged in the heat conduction plate, and the second fire extinguishing channel is connected with the first fire extinguishing channel.

[0012] Further, the liquid cooling plate further comprises a sealing plug, which is installed at one end of the second fire extinguishing channel away from the cooling liquid channel.

[0013] The first fire extinguishing medium inlet is communicated with a fire extinguishing medium storage tank, and a pressure sensor is arranged at the first fire extinguishing medium inlet.

[0014] Further, the bottom liquid cooling plate is connected with the heat conduction plate in a welded manner.

[0015] Further, the bottom liquid cooling plate is connected with the heat conduction plate in a detachable manner.

[0016] Further, the outer surfaces of the bottom liquid cooling plate and the heat conduction plate are coated with a flame-retardant insulating material.

[0017] Further, the heat dissipation liquid is ethylene glycol.

[0018] A secondary battery comprises

[0019] A plurality of battery cells are installed on the liquid cooling plate; the battery cells are located on one side of the heat conduction plate or between two heat conduction plates.

[0020] An integrated cover plate is arranged on the battery cells.

[0021] A pole piece is installed on the battery cells.

[0022] A housing is arranged to accommodate the battery cells and the liquid cooling plate.

[0023] Further, the housing is surrounded by an end plate and a side plate.

[0024] Further, a foam spacer is arranged between adjacent battery cells that are not installed with the heat conduction plate.

[0025] An electric vehicle uses the above-mentioned secondary battery.

[0026] Advantages:

[0027] 1. The heat conduction plate is arranged on the bottom liquid cooling plate to increase the heat conduction area and improve the heat dissipation efficiency of the battery cells.

[0028] 2. After the sealing plug is heated and melted, the air pressure is reduced, the fire extinguishing medium storage tank releases the fire extinguishing medium, the fire extinguishing medium enters through the first fire extinguishing medium inlet, then passes through the first fire extinguishing channel and enters the second fire extinguishing channel, and is released from the outlet of the second fire extinguishing channel to prevent the battery cells from catching fire.

[0029] Other features and advantages of the present application will be set forth in the following description of the application, and in part will become apparent to those skilled in the art upon examination of the following or can be learned by practice of the application. The objects and other advantages of the application can be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0031] Figure 1 A schematic diagram of the liquid cooling plate in the first embodiment of the present application is shown.

[0032] Figure 2 A schematic diagram of the secondary battery in the second embodiment of the present application is shown.

[0033] Figure 3 A partial structure schematic diagram of the secondary battery in the second embodiment of the present application is shown.

[0034] Figure 4 A side structure schematic diagram of the secondary battery in the second embodiment of the present application is shown.

[0035] In the figure, 1, end plate; 2, side plate; 3, integrated cover plate; 4, pole piece; 6, battery cell; 7, foam spacer;

[0036] 5, liquid cooling plate;

[0037] 510, bottom liquid cooling plate; 511, cooling liquid inlet; 512, cooling liquid outlet; 513, cooling liquid channel; 514, first fire extinguishing medium inlet; 515, first fire extinguishing channel;

[0038] 520, heat conduction plate; 521, second fire extinguishing medium inlet; 522, second fire extinguishing channel;

[0039] 530, sealing plug. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme of the embodiments of the utility model will be clearly and completely explained in combination with the drawings in the embodiments of the utility model below. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the protection scope of the utility model.

[0041] Embodiment one,

[0042] As Figure 1 shown, Figure 1 a schematic view of the liquid cooling plate 5 of the embodiment one of the utility model is shown; reference Figure 1 A kind of liquid cooling plate, comprising, bottom liquid cooling plate 510, cooling liquid passage 513 is opened in bottom liquid cooling plate 510 inside, cooling liquid passage 513 is evenly distributed in bottom liquid cooling plate 510 inside;Cooling liquid inlet 511 and cooling liquid outlet 512 are equipped on cooling liquid passage 513, cooling liquid inlet 511 and cooling liquid outlet 512 are all located in the same end surface of bottom liquid cooling plate 510;Cooling liquid inlet 511 and cooling liquid outlet 512 are connected with external water tank, water pump, to complete water circulation, to realize the heat dissipation of bottom liquid cooling plate 510, cooling liquid passage 513 shape is sequentially arranged along the long direction of bottom liquid cooling plate 510, and cooling liquid inlet 511 and cooling liquid outlet 512 (as Figure 1 shown) of all pipes are connected at the first and last ends, to complete circulation.

[0043] Thermal plate 520 is arranged on the upper surface of bottom liquid cooling plate 510, and the thermal plate 520 is perpendicular to and in contact with the upper surface of the bottom liquid cooling plate 510;Thermal plate 520 can transfer heat to bottom liquid cooling plate 510. Thermal plate 520 is made of aluminum, and the large surface of thermal plate 520 is installed with battery cell 6 on both sides, and the large surface of thermal plate 520 is attached to the large surface of battery cell 6. Bottom liquid cooling plate 510 is placed at the bottom of battery cell 6 and attached to battery cell 6. The large surface of thermal plate 520 is attached to the large surface of battery cell 6 to realize rapid heat dissipation of battery cell 6 and improve the heat dissipation efficiency (as Figure 4 shown). At the same time, this arrangement can constrain battery cell 6 to some extent and inhibit the expansion of battery cell 6.

[0044] In the above embodiment, optionally another embodiment is that a first fire extinguishing channel 515 is arranged inside the bottom liquid cooling plate 510, the first fire extinguishing channel 515 is located outside the cooling liquid channel 513, two first fire extinguishing medium inlets 514 are arranged on the first fire extinguishing channel 515; the two first fire extinguishing medium inlets 514 are located outside the cooling liquid inlet 511 and the cooling liquid outlet 512; a second fire extinguishing channel 522 is arranged inside the heat conduction plate 520, and the second fire extinguishing channel 522 is connected with the first fire extinguishing channel 515. A second fire extinguishing medium inlet 521 is arranged at one end of the heat conduction plate 520 in contact with the bottom liquid cooling plate 510, and the second fire extinguishing medium inlet 521 is in communication with the first fire extinguishing channel 515; the fire extinguishing agent enters the first fire extinguishing channel 515 through the two first fire extinguishing medium inlets 514, and then enters the second fire extinguishing medium inlet 521 and the second fire extinguishing channel 522, and is sprayed out from the outlet of the second fire extinguishing channel 522 for fire extinguishing, and the fire extinguishing medium is perfluorohexanone. Perfluorohexanone is a new type of fireproof agent, which absorbs the heat generated by the battery, rapidly reduces the temperature of the battery cell 6, and the perfluorohexanone after vaporization expands in volume to cover the entire protection area and further plays a role of isolating oxygen. When the temperature in the protection area rises, it will cause chemical cracking, and part of the bonds in the fire extinguishing agent molecules will break and combine with active free radicals generated in the combustion process, thereby blocking the chain reaction of combustion and playing a chemical inhibition function. The heat dissipation liquid is ethylene glycol, which can effectively dissipate heat. The liquid cooling plate 5 is not limited to dissipating heat for the battery cell 6, and can also be heated in a low-temperature environment.

[0045] In the above embodiment, optionally another embodiment is that the liquid cooling plate further comprises a sealing plug 530, the sealing plug 530 is installed at the outlet end of the second fire extinguishing channel 522, and the outlet end is located at one end of the heat conduction plate 520 away from the cooling liquid channel 513. The first fire extinguishing medium inlet 514 is in communication with a fire extinguishing medium storage tank, and a pressure sensor is arranged at the first fire extinguishing medium inlet 514. The sealing plug 530 is made of PA12 material, which melts after being heated, and the gas pressure decreases, and then the external perfluorohexanone tank releases the perfluorohexanone fire extinguishing agent. The perfluorohexanone fire extinguishing agent enters through the second fire extinguishing medium inlet 521, then passes through the first fire extinguishing channel 515 to enter the second fire extinguishing channel 522, and is released from the outlet of the second fire extinguishing channel 522 to prevent the battery cell 6 from catching fire.

[0046] In the embodiment of the utility model, the bottom liquid cooling plate 510 is welded with the heat conduction plate 520. Thus, the connection of the bottom liquid cooling plate 510 and the heat conduction plate 520 is reinforced.

[0047] In another embodiment of the utility model embodiment, the bottom liquid cooling plate 510 and the heat conduction plate 520 are detachably connected. A clamping groove is arranged on the bottom liquid cooling plate 510, and a buckle is arranged on the end of the heat conduction plate 520 in contact with the bottom liquid cooling plate 510. When installing, the buckle of the heat conduction plate 520 is clamped into the clamping groove on the bottom liquid cooling plate 510 to complete the connection. When disassembling, the buckle of the heat conduction plate 520 is pulled out of the clamping groove on the bottom liquid cooling plate 510 to complete the disassembly, facilitating replacement of the heat conduction plate 520.

[0048] Specifically, insulating paint is coated on the outer surfaces of the bottom liquid cooling plate 510 and the heat conduction plate 520, and the main components of the insulating paint include base material, flame retardant, curing agent, pigment and filler, solvent and additive. The probability of fire and the probability of short circuit of the battery cell 6 are reduced.

[0049] Working principle, the cooling liquid passage 513 satisfying the heat dissipation requirement is arranged on the bottom liquid cooling plate 510, and the cooling liquid inlet 511 and the cooling liquid outlet 512 are arranged on the same end of the bottom liquid cooling plate 510, and the first fire extinguishing passage 515 in the shape of "U" is arranged on the top of the bottom liquid cooling plate 510, the first fire extinguishing medium inlet 514 is arranged at the two ends of the first fire extinguishing passage 515, and the first fire extinguishing medium inlet 514 is outside the cooling liquid inlet 511 and the cooling liquid outlet 512; the second fire extinguishing passage 522 is arranged on the heat conduction plate 520, the second fire extinguishing medium inlet 521 of the second fire extinguishing passage 522 is connected with the first fire extinguishing passage 515, and the sealing plug 530 is installed at the outlet of the second fire extinguishing passage 522, and the sealing plug 530 can be melted by heat;

[0050] When the liquid cooling plate 5 is used, different numbers of heat conduction plates 520 are fixed to the same side of the large surface of the bottom liquid cooling plate 510 by welding or clamping according to different battery models and installation requirements, the second fire extinguishing medium inlet 521 of the heat conduction plate 520 is connected with the first fire extinguishing passage 515 of the bottom liquid cooling plate 510, then the first fire extinguishing passage 515 is connected with the fire extinguishing medium storage tank in communication, and a pressure sensor is arranged at the first fire extinguishing medium inlet 514. The sealing plug 530 is made of PA12 material, which is melted by heat, the air pressure is reduced, and then the external perfluorohexone tank releases perfluorohexone extinguishing agent, the perfluorohexone extinguishing agent enters through the second fire extinguishing medium inlet 521, then passes through the first fire extinguishing passage 515 and enters the second fire extinguishing passage 522, and is released from the outlet of the second fire extinguishing passage 522 to prevent the battery cell 6 from catching fire;

[0051] The cooling liquid outlet 512 and the cooling liquid passage 513 are communicated with an external water tank and a water pump to complete water circulation, thereby achieving heat dissipation of the bottom liquid cooling plate 510.

[0052] Embodiment two,

[0053] As Figure 2 shown, Figure 2 A schematic diagram of the secondary battery in the second embodiment of the utility model is shown. Figure 2 A secondary battery, comprising, a plurality of battery cells 6 are installed on the liquid cooling plate 5 of embodiment one;Integrated cover plate 3 is arranged on the battery cell 6;The pole piece 4 is installed on the battery cell 6;The battery cell 6 and the liquid cooling plate 5 are installed in the shell.

[0054] Specifically, the shell is surrounded by end plate 1 and side plate 2.Cotton spacer 7 is arranged in the middle of adjacent battery cell 6 without installing heat conduction plate 520 (as Figure 3 shown)。

[0055] Working principle:

[0056] In normal working condition, the liquid cooling liquid is entered into the cooling liquid inlet 511 of the bottom liquid cooling plate 510 by the external water tank and water pump, along the cooling liquid channel 513, and the battery cell 6 is cooled or heated by the heat conduction plate 520;Through the cooling liquid outlet 512, the liquid cooling cycle is completed, and the battery cell 6 in the module is kept at a suitable temperature.When thermal runaway occurs, the perfluorohexanone is connected with the second fire extinguishing medium inlet 521 of the heat conduction plate 520 through the first fire extinguishing medium inlet 514, and there is external pressure detection, which always maintains positive pressure.Once the sealing plug 530 of the heat conduction plate 520 is heated and melted, the air pressure does not meet the positive pressure condition and starts to release pressure, and the external perfluorohexanone tank releases perfluorohexanone extinguishing agent, which enters the first fire extinguishing channel 515 through the two first fire extinguishing medium inlets 514, and then enters the second fire extinguishing medium inlet 521 and the second fire extinguishing channel 522, and then sprays out from the second fire extinguishing channel 522 outlet to prevent the battery cell 6 from catching fire.

[0057] Embodiment three,

[0058] A trolley, which adopts the secondary battery of embodiment two, and comprises a frame, a motor, wheels and other components, which are powered by the secondary battery to drive the motor to work.

[0059] Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it still can modify the technical scheme recorded in the foregoing each embodiment, or make equivalent replacement to part of the technical features;And these modifications or replacements do not make the essence of the corresponding technical scheme deviate from the spirit and scope of the technical scheme of each embodiment of the utility model.

Claims

1. A liquid-cooled plate, characterized in that, It comprises: a bottom liquid cooling plate (510) with a cooling liquid passage (513) inside, a cooling liquid inlet (511) and a cooling liquid outlet (512) on the cooling liquid passage (513); heat dissipation through the flow of cooling liquid in the cooling liquid passage (513); a heat conduction plate (520) connected perpendicularly to the surface of the bottom liquid cooling plate (510); the heat conduction plate (520) can transfer heat to the bottom liquid cooling plate (510); a first fire extinguishing passage (515) is opened inside the bottom liquid cooling plate (510), the first fire extinguishing passage (515) is located on both sides of the cooling liquid passage (513), and two first fire extinguishing medium inlets (514) are arranged on the first fire extinguishing passage (515); the two first fire extinguishing medium inlets (514) are respectively located on both sides of the cooling liquid inlet (511) and the cooling liquid outlet (512); a second fire extinguishing passage (522) is opened inside the heat conduction plate (520), and the second fire extinguishing passage (522) is connected with the first fire extinguishing passage (515).

2. The liquid cold plate of claim 1, wherein, The liquid cooling plate further comprises a sealing plug (530) installed at one end of the second fire extinguishing passage (522) away from the cooling liquid passage (513); the first fire extinguishing medium inlet (514) is in communication with a fire extinguishing medium storage tank, and a pressure sensor is arranged at the first fire extinguishing medium inlet (514).

3. The liquid cooling plate of claim 1, wherein the bottom liquid cooling plate (510) and the heat conduction plate (520) are connected by welding.

4. The liquid cooling plate of claim 1, wherein the bottom liquid cooling plate (510) and the heat conduction plate (520) are connected by detachable connection.

5. The liquid cooling plate of claim 1, wherein a fire-retardant insulating material is coated on the outer surface of the bottom liquid cooling plate (510) and the heat conduction plate (520).

6. The liquid cooling plate of claim 1, wherein the heat dissipation liquid is ethylene glycol.

7. A secondary battery characterized by comprising: It comprises a plurality of battery cells (6) mounted on the liquid cooling plate of any one of claims 1-6; the battery cells (6) are located on one side of the heat conduction plate (520) or between two heat conduction plates (520); an integrated cover plate (3) is arranged on the battery cell (6); a pole piece (4) is mounted on the battery cell (6); a housing, in which the battery cell (6) and the liquid cooling plate (5) are installed.

8. The secondary battery according to claim 7, wherein The housing is surrounded by an end plate (1) and a side plate (2).

9. The secondary battery according to claim 7, wherein It further comprises a foam spacer (7) arranged between adjacent battery cells (6) without a heat conduction plate (520) mounted thereon.

10. An electric vehicle, characterized by It adopts the secondary battery of claim 8 or 9.

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