Liquid cooling energy storage type battery PACK structure

Abstract

The utility model relates to the technical field of batteries, in particular to a liquid cooling energy storage type battery PACK structure which comprises an integrated lower shell which is of a rectangular plate-shaped structure, a liquid cooling plate is embedded and fixed on the surface of the integrated lower shell, a module fixing structure is arranged on the surface of the integrated lower shell, a plurality of battery modules are assembled in the module fixing structure, the battery modules are arranged on the liquid cooling plate, and the liquid cooling plate is arranged on the lower shell. And the battery module is fixed on the integrated lower shell by adopting the module fixing structure, so that the problem that in a device in the prior art, a liquid cooling pipeline passes through the interior of the PACK, so that the interior of the PACK is connected by pipelines twice, and the cooling liquid leaks in the PACK is solved, and the problems that the produced PACK is relatively large in size, complex in structure, low in cost and the like are also solved. And the sealing cost is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a liquid-cooled energy storage battery PACK structure. Background Art

[0002] With the increasing requirements of the country for environmental protection and the improvement of people's environmental awareness, the battery technology industry is developing rapidly. Among them, lithium battery technology is the most accepted energy technology for alleviating environmental and energy problems. Now with the development of the lithium battery industry, energy storage systems are developing in the direction of high voltage, large capacity, clustering and scale.

[0003] With the vigorous development of battery technology, electric vehicles are becoming more and more popular as new energy green transportation tools. Since electric vehicles use on-board batteries to supply power to the motor to output power, they have significant effects in energy saving and environmental protection. Compared with traditional fuel vehicles, the popularity of electric vehicles has temporarily alleviated the current severe environmental and energy problems, but the safety of electric vehicles is still a difficult problem. Battery PACK, as the core component of electric vehicles, is a whole composed of several "battery cells", usually composed of multiple batteries, and designed into a series of reusable, adjustable and replaceable modules. These modules can be assembled as needed to form battery packs of different capacities to meet the driving force of different models and needs. As the main energy storage device on electric vehicles, batteries are key components of electric vehicles.

[0004] In the existing market, in order to meet the high performance and high standards of electric vehicles and thus improve the competitiveness, energy storage batteries are also developing in the direction of high energy density, large capacity, and high rate charging and discharging. The common automotive energy storage battery is a ternary lithium battery pack. Due to the influence of high energy density application requirements and battery group arrangement, a lot of heat will be generated during the high rate charging and discharging of the battery pack. This heat must be discharged from the energy storage device in time, otherwise it is easy to cause heat accumulation, thereby causing battery failure or safety accidents. Energy storage equipment mostly uses air cooling or liquid cooling to control the temperature of the battery box. When the temperature of the lithium battery is too high, it is cooled down to avoid safety problems caused by overheating of the battery. Therefore, the battery liquid cooling system is a core mechanical part of the thermal management of the battery pack, and its design concept has a significant impact on the entire system. Since liquid cooling has more advantages than air cooling in terms of energy consumption, noise, and volume, it has become a trend for automotive energy storage equipment to adopt liquid cooling temperature control solutions.

[0005] A liquid-cooled battery module PACK box with the publication number CN218769744U, this technical device adopts the structure of PACK bottom shell + separate liquid cooling plate, and its liquid cooling plate is placed separately in the bottom shell. The coolant inlet and outlet pipes enter the inside of the PACK through the upper shell of the PACK, and then connect to the liquid cooling plate. The module fixing structure is a fixed size fastening structure of the lower shell, which is fixed with the module waist hole. In this structural form, the cooling pipeline passes through the inside of the PACK, resulting in two pipeline connections inside the PACK, which not only has the risk of coolant leakage, but also causes high sealing costs for the PACK box, and the two pipeline connections will occupy the overall size of the PACK. The module fixing structure causes the end plate thickness to be high, making the PACK volume larger. Utility Model Content

[0006] The utility model provides a liquid-cooled energy storage battery PACK structure, which solves the problem in the prior art that a liquid cooling pipeline passes through the inside of the PACK, resulting in two pipeline connections inside the PACK, thereby causing cooling liquid to leak inside the PACK.

[0007] Secondly, it also solves the problem that the liquid cooling pipe enters the interior of the PACK box, causing the PACK to be larger in size, more complex in structure, heavier in weight, and higher in sealing costs.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] A liquid-cooled energy storage battery PACK structure includes an integrated lower shell, which is a rectangular plate-shaped structure, with a liquid cooling plate embedded and fixed on the surface, and a module fixing structure is provided on the surface. A plurality of battery modules are assembled in the module fixing structure. The battery modules are installed above the liquid cooling plate, and the module fixing structure is used to fix the battery modules on the integrated lower shell.

[0010] Preferably, the module fixing structure comprises: floating nuts, which are evenly spaced and arranged on the surface of the liquid cooling plate; module fixing holes, which are evenly spaced and arranged at the bottom of the battery module, and the module fixing holes match the floating nuts.

[0011] Preferably, it also includes an upper shell, which is a rectangular shell structure, installed on the surface of the integrated lower shell, accommodating a battery module inside, and a sealing strip is provided between the upper shell and the integrated lower shell structure, and a rivet nut is provided through the sealing strip, and the rivet nut connects and fixes the upper shell and the integrated lower shell.

[0012] Preferably, a BMS is provided on the inner wall of one side of the upper shell, and a BMS cover is provided on the corresponding outer wall. An explosion-proof valve is provided on the BMS cover, and a maintenance switch and a fire sprinkler are provided around the BMS cover.

[0013] Preferably, an all-in-one sensor is embedded in the BMS, and the all-in-one sensor is connected to the fire sprinkler circuit, and the fire sprinkler is connected to an external fire pipeline.

[0014] Preferably, a lower shell bracket is fixed to a side of the integrated lower shell away from the battery module, a liquid cooling pipeline is provided in the lower shell bracket, and a water inlet and outlet of the liquid cooling pipeline are arranged on the surface of the integrated lower shell outside the upper shell.

[0015] Preferably, thermal conductive adhesive is coated between the liquid cooling pipeline and the integrated lower shell and between the liquid cooling plate and the battery module.

[0016] Preferably, a gap between the liquid cooling plate and the integrated lower shell in which it is embedded is sealed using structural sealant.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The cooling pipeline of the utility model is located outside the box and there is no pipeline connection inside the PACK, which reduces the risk of coolant leakage and the sealing cost of the PACK box; the movable nut structure and the pipeline structure reduce the overall size of the pack, making the battery PACK volume utilization rate higher and the energy-to-volume ratio higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic exploded view of the overall structure of an embodiment of the utility model.

[0020] Figure 2 It is a schematic diagram of the overall structure of an embodiment of the utility model.

[0021] In the figure: integrated lower shell 1, battery module 2, sealing strip 3, upper shell 4, fire sprinkler 5, all-in-one sensor 6, explosion-proof valve 7, maintenance switch 8, BMS cover 9, BMS 10, lower shell bracket 11, water inlet 12, water outlet 13, electrode plug 14. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0023] Most of the existing technical devices adopt the structure of PACK bottom shell + separate liquid cooling plate, and the liquid cooling plate is placed separately in the bottom shell. The coolant inlet and outlet pipes enter the inside of the PACK through the upper shell of the PACK, and then connect to the liquid cooling plate. The module fixing structure is a fixed size fastening structure of the lower shell, which is fixed with the waist hole of the module. In this structural form, the cooling pipeline passes through the inside of the PACK, resulting in two pipeline connections inside the PACK, which not only has the risk of coolant leakage, but also causes high sealing costs for the PACK box, and the two pipeline connections will occupy the overall size of the PACK. The module fixing structure causes the end plate thickness to be high, making the PACK volume larger. In order to solve the above problems, this embodiment is provided, which includes an integrated lower shell 1, a battery module 2, a sealing strip 3, an upper shell 4, a fire sprinkler 5, an all-in-one sensor 6, an explosion-proof valve 7, a maintenance switch 8, a BMS cover 9, a BMS 10, a lower shell bracket 11, a water inlet 12, a water outlet 13, and an electrode plug 14.

[0024] See also Figure 1 , Figure 2 This embodiment is a liquid-cooled energy storage battery PACK structure, including an integrated lower shell 1, which is a main bearing mechanism and is a rectangular plate structure. A liquid cooling plate is embedded and fixed on the surface to cool the battery module 2. A module fixing structure is provided on the surface to fix the battery module. A plurality of battery modules 2 are assembled in the module fixing structure. The battery modules 2 are installed on the surface of the liquid cooling plate, and the battery modules are evenly spaced. The battery modules are fixed on the integrated lower shell 1 using the module fixing structure. The battery modules are equally spaced and separated by flame retardant plates.

[0025] In addition, the integrated lower housing 1 also has excellent heat dissipation performance, which can effectively transfer the heat generated by the battery module 2 to the liquid cooling plate, ensuring the stability and safety of the battery pack during operation. The design of the liquid cooling plate fully considers the heat dissipation requirements and adopts efficient heat dissipation paths and materials, so that the battery module 2 can maintain an ideal temperature range during operation.

[0026] Fireproof partitions are provided around the battery module 2 to form a closed space. This design can not only prevent the battery pack from short-circuiting, but also effectively suppress the spread of fire in the event of an accident, thereby improving the safety performance of the battery pack. At the same time, the fireproof partition can also play a certain buffering role, reducing the risk of damage to the battery pack during transportation and installation.

[0027] In order to further improve the reliability and durability of the battery pack, the integrated lower shell 1 is made of high-strength, lightweight materials. This material can not only ensure the structural strength of the shell, but also reduce the weight of the battery pack, thereby increasing the driving range of the entire battery system. In addition, the surface of the shell is also treated with anti-corrosion, which can maintain a long service life in harsh environments.

[0028] In terms of the connection of the battery module 2, an efficient and stable connection solution is adopted. Each battery unit is equipped with an independent battery management system (BMS) to monitor various parameters of the battery in real time to ensure that the battery operates in the best working state. At the same time, the battery management system can also balance the battery pack and extend the battery life.

[0029] In summary, the battery pack designed with the integrated lower housing 1 not only has high structural stability, but also has excellent performance in heat dissipation, fire prevention, durability, etc. This battery pack is suitable for various new energy vehicles and provides strong support for the development of my country's new energy vehicle industry. With the continuous advancement of technology, the design of battery packs will be more advanced in the future, bringing better performance and user experience to new energy vehicles.

[0030] The module fixing structure includes: floating nuts, which are evenly spaced and arranged on the surface of the liquid cooling plate; module fixing holes, which are evenly spaced and arranged at the bottom of the battery module, and the module fixing holes match the floating nuts. The floating nuts are fixed on the liquid cooling plate and the surrounding integrated lower shell 1, and the bottom of the floating nut is accommodated in the frame of the lower shell bracket 11 arranged at the bottom of the integrated lower shell. The floating nut is accommodated in the frame of the lower shell bracket, and the floating nut can perform a small radial and axial movement in the frame of the lower shell bracket, thereby making the battery module have a larger assembly tolerance range during assembly, which has the effect of reducing assembly accuracy, improving assembly efficiency, and improving PACK space utilization. In addition, in this embodiment, a nut cover is provided on the outside of the floating nut, and the nut cover is also accommodated in the frame of the lower shell bracket. The nut cover has the effect of preventing the floating nut from being knocked from the bottom and becoming ineffective; in this embodiment, the module fixing structure for fixing the battery module on the liquid cooling plate and the surrounding integrated lower shell is designed as a floating nut, and the floating nut can move in the frame of the lower shell bracket 11. The battery module fixed by the floating nut does not need to be provided with a waist-shaped hole, and the nut cover has the effect of protecting the floating nut from being knocked from the bottom. This design reduces the size of the battery module, thereby saving the size of the battery PACK, improving space utilization, and thereby increasing the battery density.

[0031] In addition, this embodiment also provides an anti-skid pad on the contact surface between the liquid cooling plate and the integrated lower housing to increase the friction between the two and ensure that the battery module is stably placed on the liquid cooling plate. The anti-skid pad is made of a material with good wear resistance and pressure resistance, which can effectively reduce the possibility of the battery module sliding on the surface of the liquid cooling plate while ensuring the stability of the battery module, further improving the battery life.

[0032] In order to ensure the safety of the battery module during operation, this embodiment also sets temperature sensors and humidity sensors around the liquid cooling plate. These sensors can monitor the working status of the battery module, as well as the temperature and humidity in the liquid cooling system in real time, to ensure that the battery operates in a suitable environment. When it is detected that the temperature or humidity exceeds the preset range, the system will automatically start the cooling system or humidification system to maintain the stability of the battery working environment.

[0033] This embodiment also optimizes the heat dissipation performance of the battery module. Multiple heat dissipation channels are set inside the liquid cooling plate so that the heat generated by the battery module can be quickly transferred to the liquid cooling liquid. At the same time, during the circulation process, the liquid cooling liquid will take away the absorbed heat and reduce the temperature of the battery module. In addition, in order to improve the heat dissipation efficiency, this embodiment also sets heat dissipation fins on the surface of the liquid cooling plate to increase the heat dissipation area and further improve the heat dissipation performance of the battery module.

[0034] In terms of the electrical connection of the battery module, this embodiment uses a high-voltage wire harness and a low-voltage wire harness to connect the high-voltage end and the low-voltage end of the battery module respectively. The high-voltage wire harness and the low-voltage wire harness are wrapped with heat-resistant, wear-resistant, and tensile-resistant sheath materials to protect the wire harness from damage by the external environment. At the same time, in order to reduce resistance loss, the wire harness is made of low-resistance material to ensure that the battery module still has high electrical performance when the current is high.

[0035] It also includes an upper shell 4, which is a rectangular shell structure, installed on the surface of the integrated lower shell 1, and the interior is the same as accommodating the battery module 2, and a sealing strip 3 is also provided between the upper shell 4 and the integrated lower shell 1 structure, and a rivet nut is provided through the sealing strip 3, and the rivet nut connects and fixes the upper shell and the integrated lower shell. The sealing strip 3 has the effect of improving the sealing effect between the upper shell and the integrated lower shell, and has the effect of improving the waterproof and dustproof effect between the upper shell and the integrated lower shell. The rivet fixation of the integrated lower shell and the upper shell has the effect of being more firmly fixed and more efficient. The tightness of the rivet nut connected between the integrated lower shell and the upper shell can be adjusted, and then the compression degree of the compressed sealing strip can be adjusted, so as to adjust the sealing performance of the sealing strip, and to a certain extent, the assembly tolerance range of the battery module can be expanded, which has the effect of adjusting the sealing performance and reducing the assembly tolerance accuracy.

[0036] The inner wall of one side of the upper shell is provided with a BMS10. BMS (battery management system) is an indispensable and important component of electric vehicles. It is the hub for managing and monitoring power batteries. It manages, maintains and monitors various modules of the battery, and is responsible for preventing the battery from being overcharged and over-discharged, extending the battery life, and helping the battery to operate normally. It is an important link between the vehicle battery and the electric vehicle. Its main functions include: real-time monitoring of battery physical parameters, battery status estimation, online diagnosis and early warning, charge and discharge and pre-charge control balance management, thermal management, etc. The BMS battery management system unit includes a BMS battery management system, a control module, a display module, a wireless communication module, electrical equipment, a battery pack for powering the electrical equipment, and a collection module for collecting battery information of the battery pack. The BMS battery management system is connected to the wireless communication module and the display module respectively through a communication interface. The output end of the collection module is connected to the input end of the BMS battery management system, and the output end of the BMS battery management system is connected to the input end of the control module. The control module is connected to the battery pack and the electrical equipment respectively. The BMS battery management system is connected to the Server server through a wireless communication module.

[0037] A BMS cover 9 is provided on the outer wall corresponding to the BMS, and an explosion-proof valve 7 is provided on the BMS cover 9 to ensure the safety of the battery pack. A maintenance switch 8 and a fire sprinkler 5 are provided around the BMS cover. The fire sprinkler 5 is connected to the vehicle-mounted perfluorohexanone material box. An all-in-one sensor 6 is embedded inside the BMS. The all-in-one sensor can detect a variety of gases, and the all-in-one sensor is connected to the fire sprinkler circuit. When the all-in-one sensor 6 can detect a variety of gases and detects gases such as carbon monoxide, the fire sprinkler will be turned on to spray perfluorohexanone into the box to achieve the fire fighting function.

[0038] The integrated lower shell 1 is fixed with a lower shell bracket 11 on one side away from the battery module 2. The lower shell bracket 11 is used to be fixed to the vehicle frame, and has the effect of preventing the liquid cooling plate and the battery pack from directly contacting the ground during assembly. A liquid cooling pipeline is provided in the lower shell bracket, and the water inlet 12 and the water outlet 13 of the liquid cooling pipeline are arranged on the surface of the integrated lower shell 1 outside the upper shell 4, thereby reducing the collision between the liquid cooling plate and the battery module 2. The water inlet and the water outlet are both arranged on the surface of the integrated lower shell outside the upper shell, thereby reducing the occupied volume inside the upper shell, thereby making the battery PACK volume utilization rate higher and the energy volume ratio higher.

[0039] Thermal conductive adhesive is coated between the liquid cooling pipeline and the integrated lower shell and between the liquid cooling plate and the battery module to improve the thermal conductivity.

[0040] The gap between the liquid cooling plate and the integrated lower housing embedded therein is sealed with a structural sealant, thereby making the present embodiment have excellent waterproof and dustproof performance, as well as lower assembly precision and assembly adjustment capability.

[0041] The side of the upper shell is provided with an electrode plug 14. There are two electrode plugs, which are respectively connected to the positive electrode and the negative electrode of the battery module, and are connected to the external circuit through the electrode plug to realize the charging and discharging function.

[0042] The technical effect of this embodiment is as follows: this embodiment adopts an integrated lower shell and liquid cooling plate integrated design, and the module fixing structure is a movable nut structure of the lower shell, which is fixed with the round hole of the module. The cooling pipeline is located outside the box, and there is no pipeline connection inside the PACK, which reduces the risk of coolant leakage and the cost of PACK box sealing. In addition, the movable nut structure and the pipeline structure reduce the overall size of the PACK, making the battery PACK volume utilization rate higher and the energy volume ratio higher.

[0043] The above are only preferred embodiments of the present invention and do not limit the present invention in any way. Any simple modification, change and equivalent transformation made to the above embodiments based on the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A liquid-cooled energy storage battery PACK structure, characterized in that: include: The integrated lower shell is a rectangular plate-shaped structure with a liquid cooling plate embedded and fixed on the surface, and a module fixing structure is provided on the surface. A number of battery modules are assembled in the module fixing structure. The battery modules are installed above the liquid cooling plate, and the module fixing structure is used to fix the battery modules on the integrated lower shell.

2. A liquid-cooled energy storage battery PACK structure according to claim 1, characterized in that: The module fixing structure includes: floating nuts, which are evenly spaced and arranged on the surface of the liquid cooling plate; module fixing holes, which are evenly spaced and arranged at the bottom of the battery module, and the module fixing holes match the floating nuts.

3. A liquid-cooled energy storage battery PACK structure according to claim 1, characterized in that: It also includes an upper shell, which is a rectangular shell structure, installed on the surface of the integrated lower shell, accommodating a battery module inside, and a sealing strip is provided between the upper shell and the integrated lower shell structure, and a rivet nut is provided through the sealing strip, and the rivet nut connects and fixes the upper shell and the integrated lower shell.

4. A liquid-cooled energy storage battery PACK structure according to claim 3, characterized in that: A BMS is arranged on the inner wall of one side of the upper shell, and a BMS cover is arranged on the corresponding outer wall. An explosion-proof valve is arranged on the BMS cover, and a maintenance switch and a fire sprinkler are arranged around the BMS cover.

5. A liquid-cooled energy storage battery PACK structure according to claim 4, characterized in that: An all-in-one sensor is embedded in the BMS, and the all-in-one sensor is connected to a fire sprinkler circuit, and the fire sprinkler is connected to an external fire pipeline.

6. A liquid-cooled energy storage battery PACK structure according to claim 1 or 3, characterized in that: The integrated lower shell is fixed with a lower shell bracket on one side away from the battery module, and a liquid cooling pipeline is arranged in the lower shell bracket, and the water inlet and outlet of the liquid cooling pipeline are arranged on the surface of the integrated lower shell outside the upper shell.

7. A liquid-cooled energy storage battery PACK structure according to claim 6, characterized in that: Thermally conductive adhesive is coated between the liquid cooling pipeline and the integrated lower shell and between the liquid cooling plate and the battery module.

8. A liquid-cooled energy storage battery PACK structure according to claim 1, 2 or 3, characterized in that: The gap between the liquid cooling plate and the integrated lower shell embedded therein is sealed by using structural sealant.

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