Lithium battery cold plate liquid cooling PACK

Abstract

The utility model relates to a lithium battery cold plate liquid cooling PACK pack in the lithium battery field, which comprises a cover plate and a box body, a containing cavity is formed in the box body, a battery cell is connected in the containing cavity through a mounting assembly, a BMS controller is connected in the containing cavity, the battery cell is electrically connected with a positive electrode connector and a negative electrode connector, and the positive electrode connector and the negative electrode connector are electrically connected with the battery cell. A cold plate used for conducting heat exchange on the battery cell is arranged in the containing cavity, a communicated cooling channel is arranged in the cold plate, one tail end of the cooling channel is connected with a cooling pipeline, a heat conduction silica gel pad is arranged on the surface of the cold plate, and the cold plate makes contact with the outer surface of the battery cell through the heat conduction silica gel pad. According to the lithium battery liquid cooling PACK pack, uniform heat exchange is carried out on the lithium battery liquid cooling PACK pack through the cold plate, heat generated by the battery cells can be taken away, so that the battery cells are cooled, the consistency of heat dissipation and cooling of the battery cells is ensured, the temperature uniformity of the battery cells of the PACK pack is further improved, meanwhile, thermal runaway is inhibited, the overall heat exchange efficiency is improved, and the safety of the lithium battery liquid cooling PACK pack is improved.

Description

Technical Field

[0001] The utility model relates to the field of lithium batteries, in particular to a lithium battery PACK package, and specifically to a lithium battery cold plate liquid cooling PACK package. Background Art

[0002] As the world pays more and more attention to renewable energy and environmental protection technology, lithium batteries, as key components in new energy equipment such as electric vehicles and energy storage power stations, have received extensive attention for their safety, stability and high performance. As an integrated unit of lithium batteries, the design of lithium battery PACK is directly related to the overall performance and operational safety of new energy equipment, especially in harsh working environments such as high temperature and high load.

[0003] The traditional lithium battery PACK is mainly composed of battery cells, BMS battery management system, protection circuit and shell. The battery cell, as the core of the PACK, is responsible for storing and releasing energy. The BMS is responsible for monitoring and managing the voltage, current, temperature and other parameters of the lithium battery PACK to ensure the safe and stable operation of the battery pack. The protection circuit plays a protective role against overcharging, over-discharging, overcurrent and short circuit to prevent the battery pack from being damaged or a safety accident.

[0004] In the heat exchange cold plate solution of the existing energy storage system lithium battery PACK, a whole cold plate is usually used at the bottom, and a closed pipeline is formed by stir friction welding. Water + ethylene glycol solution is injected into the cold plate to exchange heat with the battery cell. Water + ethylene glycol are conductive liquids. Leakage will have a great impact on electrical performance, causing short circuits, reduced insulation, etc. Ethylene glycol is also a flammable liquid. As water evaporates, the solubility of ethylene glycol increases, and there is a risk of explosion. At the same time, this solution usually requires a whole large cold plate to be welded to the front and rear pipeline sealing plates, which has high processing requirements, and usually requires a heat exchange plate to exchange heat with the coolant, which adds an intermediate heat exchange link. The overall temperature control efficiency is not high, and the internal path of the cold plate cannot be well evenly distributed, so it is difficult to control the temperature uniformity of the battery cell, resulting in poor temperature control management of the battery cell, and thus it is difficult to effectively suppress the occurrence of thermal runaway of the battery cell. Utility Model Content

[0005] The purpose of the utility model is to solve the above defects and provide a lithium battery cold plate liquid cooling PACK package to solve the technical problems in the above background technology that PACK package leakage causes short circuit, reduced insulation, poor temperature control efficiency of battery cells, resulting in the temperature of the battery cells being difficult to transfer to the cold plate, and the cold plate cannot effectively exchange heat, thereby affecting the temperature equalization effect of the battery cells.

[0006] The purpose of the utility model is achieved by the following methods:

[0007] A lithium battery cold plate liquid cooling PACK package comprises a cover plate and a box body, wherein the cover plate is detachably mounted on the box body in a paired manner, a receiving cavity is formed inside the box body, a battery cell is connected to the receiving cavity via an installation assembly, and a BMS controller for monitoring the battery cell is connected to the receiving cavity, the battery cell is electrically connected to a positive electrode connector and a negative electrode connector, both of which are exposed and arranged on the outer side of the box body, a cold plate for heat exchange of the battery cell is arranged in the receiving cavity, a conductive cooling channel is arranged inside the cold plate, one end of the cooling channel is connected to a cooling pipeline, an end of the cooling pipeline extends to the outer side of the box body, a thermal conductive silicone pad is arranged on the surface of the cold plate, and the cold plate contacts the outer surface of the battery cell through the thermal conductive silicone pad.

[0008] Further in the above description, a pad is provided in the accommodating cavity, and the cold plate is placed on the pad. There are more than two cold plates, and two adjacent cold plates are connected to the cooling channels on the corresponding cold plates through connecting pipes. By providing two cold plates, the two cold plates are connected by the connecting pipes to form a connected state, thereby reducing the difficulty of processing and connecting the cold plates.

[0009] Further in the above description, the cold plate is formed as a whole through extrusion of a mold, and a number of conductive heat dissipation cavities are formed inside the cold plate, and a number of cooling channels are provided, and two adjacent cooling channels are connected by a conductive pipeline. The cold plate is formed as a whole through extrusion, and the strength of the product is well guaranteed by extrusion molding, and it can withstand sufficiently large pressure, while reducing the processing difficulty of the cold plate, and the heat dissipation cavity formed under extrusion further improves the heat exchange and heat dissipation effect of the cold plate, thereby improving the uniform heat exchange of the thermally conductive silicone pad and improving the heat exchange efficiency.

[0010] Further in the above description, the cooling pipeline includes a refrigerant inlet pipe and a heat medium outlet pipe, and the ends of the refrigerant inlet pipe and the heat medium outlet pipe extending to the outer side of the box body are connected to the gas-liquid pipe interface for connecting to the external air conditioner. When the two cold plates are connected by the connecting pipe, the two cold plates and the refrigerant inlet pipe and the heat medium outlet pipe form a connected heat exchange circulation channel. The refrigerant is an insulating working medium, and even if it leaks, it will not affect the electrical performance, and it evaporates quickly without residue.

[0011] Optionally, a thermally conductive silicone pad provided on the cold plate can uniformly absorb the temperature generated by the battery cell, and the gas-liquid pipe interface is connected to an external air-conditioning unit, so that the heat exchange circulation channel can inject refrigerant medium into the cooling channel of the cold plate through the refrigerant inlet pipe. The cold plate can be effectively heat exchanged through the refrigerant medium and discharged from the heat medium exhaust pipe, thereby improving the heat exchange efficiency and uniform heat exchange effect of the cold plate.

[0012] The cold plate exchanges heat with the battery cell evenly through the thermally conductive silicone pad, taking away the heat of the battery cell, thereby achieving the purpose of cooling the battery cell and ensuring the temperature consistency of the battery cell.

[0013] Further in the above description, the installation assembly is composed of an end plate and a plastic-steel belt, the end plate abuts against the side of the battery cell, and the end plate is arranged on a thermally conductive silicone pad, a positioning pin is provided on the pad, the end of the positioning pin extends toward the end plate, and the end plate is passed through the thermally conductive silicone pad and the cold plate in sequence by fixing bolts, and is matched with the positioning pins and connected, and the plastic-steel belt is wrapped around the outer side of the battery cell and the end plate.

[0014] Two end plates are provided, and the two end plates are distributed on both sides of the battery cell, so that the two end plates, the battery cell and the plastic-steel strip form a battery cell module, which is convenient for positioning through the locating pins on the end plate and the pad, and fixed with fixing bolts to improve the stability and efficiency of the connection.

[0015] Further in the above description, the cover plate is connected to the box body by a plurality of sealing screws passing through the cover plate, and a sealing ring and a sealing limit angle iron are provided at the matching connection between the cover plate and the box body.

[0016] The cover plate and the box body are sealed by a sealing ring, and the box body and the cover plate are sealed and connected by sealing screws, and the IP level after installation reaches IP68. A sealing limit angle iron is used between the cover plate and the box body to ensure that the sealing ring is at the same compression height when the sealing screw is locked, thereby ensuring a good seal.

[0017] Further in the above description, a fire interface is provided on the side of the box body, a fire pipe is connected to the fire interface, the fire pipe is arranged in the accommodating cavity, and the end of the fire pipe extends toward the battery cell, and a pressure relief port connected to the accommodating cavity is opened on the side of the box body.

[0018] Optionally, a fire-fighting interface is provided on the side of the box body, so that in extreme cases when thermal runaway of the battery cell occurs, fire-fighting gas can be sprayed into the accommodating cavity of the box body through the fire-fighting interface, thereby suppressing the occurrence of thermal runaway of the battery cell and reducing the risk of explosion.

[0019] Optionally, a pressure relief port is provided on the side of the box body, so that the gas generated by thermal runaway of the battery cell can be discharged out of the box, preventing the danger of explosion caused by excessive internal pressure, thereby improving the safety of use. Under normal circumstances, this pressure relief port can balance the pressure inside the box body.

[0020] In the above description, the two sides of the box are symmetrically connected with a mobile frame, the bottom of the mobile frame is connected with a plurality of rotatable rollers, and one end of the mobile frame is connected with a hook. The mobile frame connected with rollers can be conveniently moved to move the PACK.

[0021] The beneficial effects of the utility model are as follows: a thermally conductive silicone pad is arranged on the cold plate, and the thermally conductive silicone pad is in contact with the battery cell. The thermally conductive silicone pad has good thermal conductivity and can quickly transfer the heat generated by the battery cell to the cold plate, and make the heat of the battery cell be evenly transferred to the cold plate, thereby improving the uniformity and consistency of heat transfer. The cold plate is connected to a cooling pipeline, and the cooling channel of the cold plate can exchange refrigerant and heat medium through the cooling pipeline, and the refrigerant and heat medium can be effectively evenly flowed in the cooling channel of the cold plate, thereby forming a circulation loop on the cold plate, so that under the heat conduction of the thermally conductive silicone pad, the cold plate performs uniform heat exchange on it, and the heat generated by the battery cell can be taken away, thereby achieving the goal of cooling the battery cell and ensuring the consistency of heat dissipation and cooling of the battery cell temperature, further improving the temperature uniformity of the PACK package battery cell, while suppressing the occurrence of thermal runaway, improving the overall heat exchange efficiency, and thus improving the safety of the lithium battery liquid-cooled PACK package. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional diagram from a top view of the present embodiment;

[0023] Figure 2 This is a three-dimensional diagram of the present embodiment from a bottom-up perspective;

[0024] Figure 3 is a cross-sectional view of this embodiment;

[0025] Figure 4 is an exploded view of this embodiment;

[0026] Figure 5 for Figure 4 A is a partial enlarged schematic diagram;

[0027] Figure 6 Schematic diagram of the connection structure of the shell cover in this embodiment;

[0028] Figure 7 for Figure 6 A partial enlarged schematic diagram of B in the middle;

[0029] The reference numerals in the figure are: 1-cover, 2-box, 3-accommodating cavity, 4-battery cell, 5-BMS controller, 6-positive terminal, 7-negative terminal, 8-cold plate, 9-cooling channel, 10-cooling pipeline, 101-refrigerant inlet pipe, 102-heat medium discharge pipe, 11-thermal conductive silicone pad, 12-pad, 13-connecting pipeline, 14-heat dissipation cavity, 15-conducting pipeline, 16-gas-liquid pipe interface, 17-end plate, 18-plastic steel belt, 19-locating pin, 20-fixing bolt, 21-sealing screw, 22-sealing ring, 23-sealing limit angle iron, 24-fire interface, 25-fire pipeline, 26-pressure relief port, 27-movable frame, 28-roller. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0031] In this embodiment, refer to Figure 1-Figure 7 A lithium battery cold plate 8 liquid cooling PACK package specifically implemented therein comprises a cover plate 1 and a box body 2, wherein the cover plate 1 is detachably mounted on the box body 2 in a paired manner, a receiving chamber 3 is formed inside the box body 2, a battery cell 4 is connected to the receiving chamber 3 through an installation assembly, and a BMS controller 5 for monitoring the battery cell 4 is connected to the receiving chamber 3, the battery cell 4 is electrically connected to a positive electrode connector 6 and a negative electrode connector 7, both of which are exposed and arranged on the outer side of the box body 2, a cold plate 8 for heat exchange of the battery cell 4 is arranged in the receiving chamber 3, a conductive cooling channel 9 is arranged inside the cold plate 8, one end of the cooling channel 9 is connected to a cooling pipeline 10, and an end of the cooling pipeline 10 extends to the outer side of the box body 2, a thermal conductive silicone pad 11 is arranged on the surface of the cold plate 8, and the cold plate 8 contacts the outer surface of the battery cell 4 through the thermal conductive silicone pad 11.

[0032] A pad 12 is provided in the accommodating cavity 3, and the cold plate 8 is placed on the pad 12. Two cold plates 8 are provided, and the two adjacent cold plates 8 are connected to the cooling channels 9 on the corresponding cold plates 8 through a connecting pipe 13. By providing two cold plates 8, the two cold plates 8 are connected by the connecting pipe 13 to form a connected state, thereby reducing the difficulty of processing and connecting the cold plates 8.

[0033] The cold plate 8 is integrally formed by die extrusion, and a plurality of conductive heat dissipation cavities 14 are formed inside the cold plate 8. A plurality of cooling channels 9 are provided, and two adjacent cooling channels 9 are connected by a conductive pipeline 15. The cold plate 8 is integrally formed by extrusion, which reduces the processing difficulty of the cold plate 8, and the heat dissipation cavity 14 formed by extrusion further improves the heat exchange and heat dissipation effect of the cold plate 8, thereby improving the uniform heat exchange of the thermal conductive silicone pad 11 and improving the heat exchange efficiency.

[0034] The cooling pipeline 10 includes a refrigerant inlet pipe 101 and a heat medium exhaust pipe 102. The ends of the refrigerant inlet pipe 101 and the heat medium exhaust pipe 102 extending toward the outer side of the box body 2 are connected to a gas-liquid pipe interface 16 for connecting to an external air-conditioning outdoor unit. When the two cold plates 8 are connected by the connecting pipeline 13, the two cold plates 8 can form a connected heat exchange circulation channel with the refrigerant inlet pipe 101 and the heat medium exhaust pipe 102.

[0035] Optionally, the thermally conductive silicone pad 11 provided on the cold plate 8 can uniformly absorb the temperature generated by the battery cell 4, and the gas-liquid pipe interface 16 is connected to an external air-conditioning unit, so that the heat exchange circulation channel can inject a refrigerant medium into the cooling channel 9 of the cold plate 8 through the refrigerant inlet pipe 101. An example of the refrigerant medium can be a refrigerant. The cold plate 8 can be effectively exchanged with the refrigerant medium and discharged from the heat medium exhaust pipe 102, thereby improving the heat exchange efficiency and uniform heat exchange effect of the cold plate 8.

[0036] The cold plate 8 is made to evenly exchange heat with the battery core 4 through the thermally conductive silicone pad 11 , and the heat of the battery core 4 is taken away, so as to cool the battery core 4 and ensure the temperature consistency of the battery core 4 .

[0037] The mounting assembly is composed of an end plate 17 and a plastic-steel belt 18. The end plate 17 abuts against the side of the battery cell 4 and is arranged on the thermally conductive silicone pad 11. A positioning pin 19 is provided on the pad 12. The end of the positioning pin 19 extends toward the end plate 17. The fixing bolts 20 on the end plate 17 pass through the thermally conductive silicone pad 11 and the cold plate 8 in sequence and are matched with the positioning pin 19. The plastic-steel belt 18 is wrapped around the outer side of the battery cell 4 and the end plate 17.

[0038] Two end plates 17 are provided, and the two end plates 17 are distributed on both sides of the battery cell 4, so that the two end plates 17, the battery cell 4 and the plastic steel belt 18 form a battery cell 4 module, which is convenient for positioning through the positioning pins 19 on the end plate 17 and the pad 12, and fixed with fixing bolts 20 to improve the stability and efficiency of the connection.

[0039] The cover plate 1 is connected to the box body 2 through a plurality of sealing screws 21 passing through the cover plate 1 . A sealing ring 22 and a sealing limiting angle iron 23 are provided at the matching connection between the cover plate 1 and the box body 2 .

[0040] The cover plate 1 and the box body 2 are sealed by the sealing ring 22, and the box body 2 and the cover plate 1 are sealed and connected by the sealing screws 21, and the IP level after installation reaches IP68. The sealing limit angle iron 23 is used between the cover plate 1 and the box body 2 to ensure that the sealing ring 22 is locked and compressed at the same height when the sealing screws 21 are locked, thereby ensuring good sealing.

[0041] A fire interface 24 is provided on the side of the box body 2, and a fire pipe 25 is connected to the fire interface 24. The fire pipe 25 is arranged in the accommodating cavity 3, and the end of the fire pipe 25 extends toward the battery cell 4. A pressure relief port 26 connected to the accommodating cavity 3 is opened on the side of the box body 2.

[0042] Optionally, a fire interface 24 is provided on the side of the box body 2, so that in an extreme case when the battery cell 4 experiences thermal runaway, firefighting gas can be sprayed into the accommodating cavity 3 of the box body 2 through the fire interface 24, thereby suppressing the occurrence of thermal runaway of the battery cell 4 and reducing the risk of explosion.

[0043] Optionally, a pressure relief port 26 is provided on the side of the box 2 to discharge the gas generated by thermal runaway of the battery cell 4 out of the box, thereby preventing the risk of explosion caused by excessive internal pressure and improving the safety of use. In some embodiments, the pressure relief port 26 can balance the pressure inside the box 2.

[0044] The two sides of the box body 2 are symmetrically connected with a moving frame 27, the bottom of the moving frame 27 is connected with a plurality of rotatable rollers 28, and one end of the moving frame 27 is connected with a hook. The moving frame 27 connected with the rollers 28 can be conveniently moved to the PACK package.

[0045] The side of the box 2 is also provided with a communication interface corresponding to the sampling line.

[0046] The specific use of this embodiment is as follows: the battery cell 4 and the two end plates 17 are assembled with the plastic steel belt 18 to form a battery cell 4 module, the pad 12 is installed in the accommodating cavity 3, the cold plate 8 is arranged at the bottom of the battery cell 4 module, and a thermal conductive silicone pad 11 is arranged on the upper surface of the cold plate 8 and contacts with the bottom of the battery cell 4 module. The battery cell 4 module is positioned and installed with the positioning pins 19 on the pad 12 through the fixing bolts 20. Two cold plates 8 are provided, and the two cold plates 8 are connected through the connecting pipe 13 to form a double circulation pipeline. The refrigerant inlet pipe 101 and the heat medium exhaust pipe 102 are connected through one end of the cold plate 8, and the refrigerant inlet pipe 101 and the heat medium exhaust pipe 102 are connected to the external air conditioner outdoor unit. When the battery cell 4 generates heat during operation, the thermal conductive silicone pad 11 absorbs the heat of the battery cell 4 and transfers it to the heat medium exhaust pipe 102. When the refrigerant medium of the air-conditioning outdoor unit passes through the refrigerant inlet pipe 101 and enters the cooling channel 9 of the cold plate 8, the heat exchange can be performed on the thermal conductive silicone pad 11 through the cold plate 8, and then the battery cell 4 can be evenly heat exchanged, thereby taking away the heat of the battery cell 4, so as to achieve the purpose of cooling the battery cell 4 and ensuring the temperature consistency of the battery cell 4, and a fire interface 24 is arranged on the side of the box body 2. When the battery cell 4 has thermal runaway in extreme cases, the fire interface 24 can also be used to spray firefighting gas into the box body 2, so as to suppress the occurrence of thermal runaway of the battery cell 4 and prevent the risk of explosion, and a pressure relief port 26 is reserved to discharge the gas generated by the thermal runaway of the battery cell 4 out of the box, so as to improve the temperature uniformity of the PACK battery cell 4, suppress the occurrence of thermal runaway, and improve the safety of the lithium battery energy storage system.

[0047] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Although the utility model is disclosed as a preferred embodiment as above, it is not used to limit the utility model. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content disclosed above without departing from the scope of the technical solution of the utility model. However, any simple modification, equivalent change and modification made to the above embodiments according to the technology of the utility model, which does not depart from the content of the technical solution of the utility model, belongs to the scope of the technical solution of the utility model.

Claims

1. A lithium battery cold plate liquid cooling PACK package, comprising a cover plate and a box body, wherein the cover plate is detachably mounted on the box body in a paired manner, a receiving cavity is formed inside the box body, a battery cell is connected to the receiving cavity through an installation component, and a BMS controller for monitoring the battery cell is connected to the receiving cavity, the battery cell is electrically connected to a positive electrode connector and a negative electrode connector, and the positive electrode connector and the negative electrode connector are both exposed and arranged on the outer side of the box body, characterized in that: A cold plate for exchanging heat for the battery cell is arranged in the accommodating cavity, a conductive cooling channel is arranged inside the cold plate, one end of the cooling channel is connected to a cooling pipeline, the end of the cooling pipeline extends to the outer side of the box body, a thermally conductive silicone pad is arranged on the surface of the cold plate, and the cold plate contacts the outer surface of the battery cell through the thermally conductive silicone pad.

2. According to claim 1, a lithium battery cold plate liquid cooling PACK package, characterized in that: A pad is arranged in the accommodating cavity, and a cold plate is placed on the pad. More than two cold plates are arranged, and two adjacent cold plates are connected to cooling channels on corresponding cold plates through connecting pipelines.

3. A lithium battery cold plate liquid cooling PACK according to claim 2, characterized in that: The cold plate is formed in one piece by extrusion of a mold, and a plurality of conducting heat dissipation cavities are formed inside the cold plate. A plurality of cooling channels are provided, and two adjacent cooling channels are connected through a conducting pipeline.

4. A lithium battery cold plate liquid cooling PACK according to claim 3, characterized in that: The cooling pipeline includes a refrigerant inlet pipe and a heat medium exhaust pipe. The ends of the refrigerant inlet pipe and the heat medium exhaust pipe extending toward the outer side of the box body are connected with gas-liquid pipe interfaces for connecting to an external air-conditioning outdoor unit. When the two cold plates are connected by the connecting pipeline, a heat exchange circulation channel connected to the two cold plates and the refrigerant inlet pipe and the heat medium exhaust pipe can be formed.

5. A lithium battery cold plate liquid cooling PACK according to claim 2, characterized in that: The mounting assembly is composed of an end plate and a plastic-steel belt. The end plate abuts against the side of the battery cell and is arranged on a thermally conductive silicone pad. A positioning pin is provided on the pad, and the end of the positioning pin extends toward the end plate. The end plate is passed through the thermally conductive silicone pad and the cold plate in sequence by fixing bolts, and is matched with the positioning pins and connected. The plastic-steel belt is wrapped around the outer side surfaces of the battery cell and the end plate.

6. A lithium battery cold plate liquid cooling PACK according to claim 1, characterized in that: The cover plate is connected to the box body through a plurality of sealing screws passing through the cover plate, and a sealing ring and a sealing limiting angle iron are arranged at the matching connection between the cover plate and the box body.

7. A lithium battery cold plate liquid cooling PACK according to any one of claims 1 to 6, characterized in that: A fire interface is provided on the side of the box body, and a fire pipe is connected to the fire interface. The fire pipe is arranged in the accommodating cavity, and the end of the fire pipe extends toward the battery cell. A pressure relief port connected to the accommodating cavity is opened on the side of the box body.

8. A lithium battery cold plate liquid cooling PACK according to any one of claims 1 to 6, characterized in that: The two sides of the box body are symmetrically connected with moving frames, the bottom of the moving frame is connected with a plurality of rotatable rollers, and one end of the moving frame is connected with a hook.

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