High-capacity liquid-cooled battery pack

Abstract

The utility model discloses a high-capacity liquid-cooled battery pack, particularly relates to the technical field of liquid-cooled battery packs, and comprises a battery pack main body, and a plurality of battery cells, a maintenance panel, an explosion-proof valve, a fire-fighting nozzle, a positive electrode connector, a negative electrode connector, an MSD maintenance switch, a communication port, a water inlet, a water outlet, a CCS acquisition wire harness and a BMS module which are arranged in the battery pack main body, the maintenance panel is fixed on the battery pack main body, and the explosion-proof valve, the fire-fighting nozzle, the positive electrode connector, the negative electrode connector, the MSD maintenance switch and the communication port are arranged on the rear side of the maintenance panel and are all fixed on the battery pack main body. Electric energy of an external power supply is transmitted into the battery pack through the positive connector and the negative connector, the positive connector and the negative connector adopt a quick-plug copper bar connecting structure, and the surface of the copper bar is provided with an insulating protective layer, so that high efficiency and safety of electric energy transmission are ensured, the capacity is increased by about 7.3%, the structure is simple, and the cost is low. And the material cost and the production cost are effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to liquid cooling battery pack technical field more specifically, the utility model relates to a kind of large capacity liquid cooling battery pack. BACKGROUND

[0002] Liquid cooling battery pack is a kind of battery assembly for electric vehicle, energy storage system and other fields, it controls the temperature of battery by liquid cooling technology, to improve the performance, safety and service life of battery;Battery unit is the core part of liquid cooling battery pack, composed of multiple battery modules, each battery module contains multiple battery monomers, which are connected together to form battery pack, to provide power for equipment.

[0003] The maximum capacity battery pack currently used is composed of 52 pieces of 314Ah square lithium iron phosphate battery cells, with a total capacity of 52.2kWh;52 pieces of battery cells are equally divided into 4 modules, and the fuse protection device and the switching device are connected in series by copper bars, and the voltage and temperature are uploaded to the BMS system through the collection harness for data reading, the battery pack has low capacity, and more auxiliary materials are used, which indirectly increases the material cost and production cost. SUMMARY

[0004] In order to overcome the above-mentioned defects of the prior art, the utility model provides a large capacity liquid cooling battery pack, which aims to solve the problems raised in the above background art.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a large capacity liquid cooling battery pack, comprising a battery pack main body and a plurality of battery cells, a maintenance panel, an explosion-proof valve, a fire nozzle, a positive connector, a negative connector, an MSD maintenance switch, a communication port, a water inlet, a water outlet, a CCS collection harness and a BMS module arranged in the battery pack main body, the maintenance panel is fixed on the battery pack main body, the explosion-proof valve, the fire nozzle, the positive connector, the negative connector, the MSD maintenance switch and the communication port are arranged on the rear side of the maintenance panel and are fixed on the battery pack main body, the water inlet and the water outlet are arranged at the bottom of the battery pack main body and are communicated with the liquid cooling plate in the battery pack main body through the liquid cooling pipeline, and the CCS collection harness is connected with the voltage and temperature collection point of the battery cell and the BMS module.

[0006] Further, the battery pack main body adopts an aluminum alloy frame structure, and the inside of the battery pack main body is provided with a plurality of module mounting positions for fixing the battery cells.

[0007] Further, the battery cell is a 314Ah square lithium iron phosphate battery cell, and the plurality of battery cells are fixed in the battery pack main body in a 7x8 matrix arrangement.

[0008] It can be seen that, in the above technical scheme, the material cost is reduced.

[0009] Further, the battery pack body top is provided with a detachable box cover, and a waterproof sealing ring is arranged between the box cover and the battery pack body.

[0010] It can be seen that the above technical scheme can facilitate the disassembly and maintenance of the battery cell.

[0011] Further, the positive connector and the negative connector adopt a fast-plug copper bar connection structure, and the surface of the copper bar is provided with an insulating protective layer.

[0012] It can be seen that the above technical scheme can ensure efficient and safe power transmission.

[0013] Further, the fire-fighting nozzle is communicated with a fire extinguishing medium storage tank in the battery pack body, and the storage tank is electrically connected with the BMS module, wherein the fire extinguishing medium can be released when the BMS module detects an abnormality.

[0014] Further, the BMS module can monitor the voltage, temperature and SOC of the battery cell in real time, and intelligently control the charging and discharging process of the battery pack according to the monitoring results.

[0015] The technical effects and advantages of the utility model are as follows:

[0016] 1. In the utility model, the power of the external power supply is transmitted to the inside of the battery pack through the positive connector and the negative connector, the positive connector and the negative connector adopt a fast-plug copper bar connection structure, and the surface of the copper bar is provided with an insulating protective layer, so that efficient and safe power transmission is ensured, 314Ah square lithium iron phosphate battery cells are adopted, arranged in a 7*8 matrix, and the single-pack capacity reaches 56*3.2V*314Ah approximately 56kWh, which is about 7.3% higher than the capacity of the traditional 52-section 314Ah battery cell 52.2kWh scheme, the structure is simple, and the material cost and production cost are effectively reduced.

[0017] 2. In the utility model, when a large amount of gas is generated in the battery pack due to short circuit, overcharge, overheating and the like, causing the internal pressure to rise sharply, the explosion-proof valve will automatically open to release the internal pressure and prevent the battery pack from exploding, thereby ensuring safety in use, the fire-fighting nozzle is communicated with a fire extinguishing medium storage tank in the battery pack body, and the storage tank is electrically connected with the BMS module, when the BMS module detects an abnormally high temperature, smoke or other conditions that may cause a fire in the battery pack, the storage tank will be immediately controlled to release the fire extinguishing medium, the fire extinguishing medium is sprayed into the battery pack through the fire-fighting nozzle, the fire is extinguished in time, and greater losses caused by fire spreading are avoided, and the safety performance is high. DRAWINGS

[0018] The structure, proportion, size and the like shown in the specification are only used to cooperate with the content disclosed in the specification, to be understood and read by those skilled in the art, and do not define the limiting conditions for the implementation of the utility model, so they do not have technical substantive significance. Any modification of structure, change of proportion relationship or adjustment of size, without affecting the functions and purposes that the utility model can produce, should still fall within the scope of the technical content disclosed by the utility model.

[0019] Figure 1 It is a whole structure schematic view of the utility model;

[0020] Figure 2 It is a whole structure bottom view of the utility model;

[0021] Figure 3 It is a battery pack main body and cell assembly structure schematic view of the utility model;

[0022] Figure 4 It is a battery pack main body and cell assembly structure schematic view of the utility model; Figure 1 It is a structure A enlarged view.

[0023] In the figure: 1, battery pack main body; 2, box cover; 3, maintenance panel; 4, water inlet; 5, water outlet; 6, cell; 7, explosion-proof valve; 8, fire nozzle; 9, positive connector; 10, negative connector; 11, MSD maintenance switch; 12, communication port; 13, CCS acquisition wire harness; 14, BMS module. Specific implementation

[0024] The implementation of the utility model will be described by specific embodiments. Those skilled in the art can easily understand other advantages and functions of the utility model from the content disclosed in the specification. Obviously, the described embodiments are part of the embodiments of the utility model, not all. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0025] Refer to the drawings in the specification Figures 1-4The large-capacity liquid-cooled battery pack of the embodiment includes a battery pack body 1 and a plurality of battery cells 6, a maintenance panel 3, an explosion-proof valve 7, a fire-fighting nozzle 8, a positive electrode connector 9, a negative electrode connector 10, an MSD maintenance switch 11, a communication port 12, a water inlet 4, a water outlet 5, a CCS collection harness 13, and a BMS module 14 arranged in the battery pack body 1. The maintenance panel 3 is fixed to the battery pack body 1. The explosion-proof valve 7, the fire-fighting nozzle 8, the positive electrode connector 9, the negative electrode connector 10, the MSD maintenance switch 11, and the communication port 12 are arranged at the rear side of the maintenance panel 3 and are fixed to the battery pack body 1. The water inlet 4 and the water outlet 5 are arranged at the bottom of the battery pack body 1 and are in communication with the liquid cooling plate in the battery pack body 1 through a liquid cooling pipe. The CCS collection harness 13 is connected to the voltage and temperature collection points of the battery cells 6 and the BMS module 14.

[0026] Further, the battery pack body 1 adopts an aluminum alloy frame structure, and the inside of the battery pack body 1 is provided with a plurality of module mounting positions for fixing the battery cells 6. The battery cells 6 are 314 Ah square lithium iron phosphate battery cells, and the plurality of battery cells 6 are arranged in a 7x8 matrix in the battery pack body 1.

[0027] Further, the top of the battery pack body 1 is provided with a detachable box cover 2, and a waterproof sealing ring is arranged between the box cover 2 and the battery pack body 1.

[0028] Further, the positive electrode connector 9 and the negative electrode connector 10 adopt a quick plug type copper bar connection structure, and the surface of the copper bar is provided with an insulating protective layer. The fire-fighting nozzle 8 is in communication with a fire extinguishing medium storage tank in the inside of the battery pack body 1, and the storage tank is electrically connected to the BMS module 14. When the BMS module 14 detects an abnormality, the release of the fire extinguishing medium can be controlled. The BMS module 14 can monitor the voltage, temperature, and SOC of the battery cells 6 in real time and intelligently control the charging and discharging process of the battery pack according to the monitoring results.

[0029] The use method of the embodiment is as follows:

[0030] In use, when the battery pack is connected to a charging device, the electrical energy of the external power supply is transmitted to the inside of the battery pack through the positive electrode connector 9 and the negative electrode connector 10. The positive electrode connector 9 and the negative electrode connector 10 adopt a quick plug type copper bar connection structure, and the surface of the copper bar is provided with an insulating protective layer, which ensures efficient and safe transmission of electrical energy. After the electrical energy enters the battery pack, it is distributed to each battery cell 6 through the intelligent control of the BMS module 14. The BMS module 14 monitors the voltage, temperature, and SOC of the battery cells 6 in real time and adjusts the charging current and voltage according to the monitoring results to ensure that each battery cell 6 can be charged in a safe and efficient state. For example, when the voltage of a certain battery cell 6 approaches the full charge state, the BMS module 14 will appropriately reduce the charging current of the battery cell 6 to prevent overcharging.

[0031] In the discharging process, the chemical energy stored in the battery cell 6 is converted into electrical energy, and the BMS module 14 also monitors the parameters of the battery cell 6 in real time, and reasonably allocates the electrical energy output according to the load demand; when the battery pack supplies power to external equipment, the electrical energy is output to the external load through the positive connector 9 and the negative connector 10, and at the same time, the BMS module 14 will monitor the discharge current to avoid excessive discharge current from causing damage to the battery cell 6, and a 314Ah square lithium iron phosphate battery cell is used, arranged in a 7x8 matrix (a total of 56 pieces), and the single-pack capacity reaches 56x3.2Vx314Ah≈56kWh, compared with the traditional 52.2kWh scheme of 52 pieces of 314Ah battery cells, the capacity is increased by about 7.3%, the structure is simple, and the material cost and production cost are effectively reduced.

[0032] The cooling liquid enters the liquid cooling pipeline at the bottom of the battery pack main body 1 from the water inlet 4, absorbs the heat generated by the battery cell 6 during the flow process, and flows out of the battery pack from the water outlet 5 after the temperature rises, enters the external cooling equipment for heat dissipation treatment, and the cooled cooling liquid is circulated into the battery pack again, so as to realize the continuous cooling of the battery cell 6;

[0033] When a large amount of gas is generated in the battery pack due to short circuit, overcharge, overheating and other reasons, causing the internal pressure to rise sharply, the explosion-proof valve 7 will automatically open to release the internal pressure and prevent the battery pack from exploding, thereby ensuring safety, the fire nozzle 8 is communicated with the fire extinguishing medium storage tank in the battery pack main body 1, and the storage tank is electrically connected with the BMS module 14, when the BMS module 14 detects that there is an abnormally high temperature, smoke or other conditions that may cause a fire in the battery pack, it will immediately control the storage tank to release the fire extinguishing medium, and the fire extinguishing medium is sprayed into the battery pack through the fire nozzle 8 to extinguish the fire in time and avoid the spread of the fire to cause greater losses, and the safety performance is high.

[0034] The contents not described in detail in the specification all belong to the prior art known to those skilled in the art, the above is only a preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A high capacity liquid-cooled battery pack, characterized by: The battery pack body (1) and a plurality of battery cells (6) arranged in the battery pack body (1), a maintenance panel (3), an explosion-proof valve (7), a fire-fighting nozzle (8), a positive electrode connector (9), a negative electrode connector (10), an MSD maintenance switch (11), a communication port (12), a water inlet (4), a water outlet (5), a CCS collection wire harness (13), and a BMS module (14) are included.

2. The high capacity liquid-cooled battery pack of claim 1, wherein: The battery pack body (1) adopts an aluminum alloy frame structure, and a plurality of module mounting positions for fixing the battery cells (6) are arranged in the battery pack body (1).

3. The high capacity liquid-cooled battery pack of claim 1, wherein: The battery cells (6) are 314Ah square lithium iron phosphate battery cells, and the plurality of battery cells (6) are arranged in the battery pack body (1) in a 7x8 matrix arrangement.

4. The high capacity liquid-cooled battery pack of claim 1, wherein: A detachable box cover (2) is arranged on the top of the battery pack body (1), and a waterproof sealing ring is arranged between the box cover (2) and the battery pack body (1).

5. The high capacity liquid-cooled battery pack of claim 1, wherein: The positive electrode connector (9) and the negative electrode connector (10) adopt a quick plug type copper bar connection structure, and an insulating protective layer is arranged on the surface of the copper bar.

6. The high capacity liquid-cooled battery pack of claim 1, wherein: The fire-fighting nozzle (8) is in communication with a fire extinguishing medium storage tank in the battery pack body (1), the storage tank is electrically connected with the BMS module (14), and when the BMS module (14) detects an abnormality, the release of the fire extinguishing medium can be controlled.

7. The high capacity liquid-cooled battery pack of claim 1, wherein: The BMS module (14) can monitor the voltage, temperature, and SOC of the battery cells (6) in real time, and intelligently control the charging and discharging process of the battery pack according to the monitoring results.

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