CN211879414U

CN211879414U - Sealed heat dissipation battery pack

Info

Publication number: CN211879414U
Application number: CN202020941664.9U
Authority: CN
Inventors: 尚德华; 杨泽乾
Original assignee: Aopu Shanghai New Energy Co Ltd
Current assignee: Aopu Shanghai New Energy Co Ltd
Priority date: 2020-05-29
Filing date: 2020-05-29
Publication date: 2020-11-06
Anticipated expiration: 2030-05-29

Abstract

The utility model discloses a sealed heat dissipation battery package. The utility model comprises a box body, a battery module and a top cover; the box body is a cover-free sealed box body, the battery module is placed in the box body, and the top cover is fixed on the upper part of the box body; the top cover is provided with a liquid feeding hole for injecting fire extinguishing coolant into the box body, and a gap is reserved between the liquid level of the fire extinguishing coolant and the top cover. The utility model discloses a lithium ion battery submergence is in the coolant of putting out a fire, and the coolant of putting out a fire has insulating characteristics, and electric core and electric part contact in can direct and the battery package, therefore the temperature of each point in the battery package all is unanimous, can avoid the risk of lithium ion battery burning explosion, has improved the security of battery package.

Description

Sealed heat dissipation battery pack

Technical Field

The utility model relates to a battery package heat dissipation technical field, specific sealed heat dissipation battery package that says so.

Background

The lithium ion battery has the advantages of large energy density, multiple cycle times, light weight, high performance and the like, gradually becomes an indispensable important component in the electrochemical energy storage industry, and is widely applied to various energy storage scenes. In the current lithium ion battery field, because the service life of the lithium ion battery can be shortened sharply at high temperature, even safety risks are caused, and inconsistency of the lithium ion battery can be increased at high temperature to influence normal use, the battery pack needs a good thermal management system, so that the lithium ion battery can work at a certain temperature, and the service life of the lithium ion battery is prolonged.

The prior art scheme mainly has two kinds: one is air cooling, also called air cooling, is a passive cooling mode, takes away heat in the battery pack through natural air flow, has simple structure and low cost, but has poor heat management effect, is only suitable for lithium ion batteries with low heat productivity or excellent high-temperature performance, and needs to operate under low multiplying power; the other type is liquid cooling (mainly water cooling), a guide pipe is used for winding the battery, the guide pipe is filled with water as collective cooling liquid, the heat of the battery pack is conducted out in time, the structure is complex, the cost is high, the extra volume of the battery pack is increased, the battery pack is not beneficial to assembly, and once the guide pipe is broken, internal short circuit is easily caused, so that serious safety risk is caused. By adopting the two methods, the temperature of the lithium ion battery in the battery pack is still inconsistent, and after the lithium ion battery is used for a long time, the inconsistency of the lithium ion battery is gradually increased, so that the normal use is influenced.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned weak point that exists among the prior art, the to-be-solved technical problem of the utility model is to provide a design is simple, and the heat management effect is outstanding to can compromise the sealed heat dissipation battery package of safe risk.

The utility model discloses a realize that the technical scheme that above-mentioned purpose adopted is: a sealed heat-dissipation battery pack comprises a box body, a battery module and a top cover; the box body is a cover-free sealed box body, the battery module is placed in the box body, and the top cover is fixed on the upper part of the box body; the top cover is provided with a liquid feeding hole for injecting fire extinguishing coolant into the box body, and a gap is reserved between the liquid level of the fire extinguishing coolant and the top cover.

The battery module comprises a bottom clapboard, a battery core and an upper clapboard; the bottom clapboard is placed on the bottom surface in the seal box body, a plurality of spaced fixing grooves are formed in the bottom clapboard, each battery cell is fixed in one fixing groove, a plurality of battery cells are combined in series and parallel through connecting pieces, the upper clapboard is placed on the upper portion of each battery cell, and the positive and negative poles of each battery cell penetrate through the upper clapboard to expose the first explosion-proof valve.

The top cover is connected with the box body through bolts and sealed through sealant.

The upper surface of the top cover is provided with a protruded fin-shaped radiating fin.

And a water cooling device is laid between the fin-shaped radiating fins.

The water cooling device comprises a water inlet, a cooling water pipeline and a water outlet; the water inlet and the water outlet are arranged outside the fin-shaped radiating fins, and the cooling water pipeline is wound in the gaps of the fin-shaped radiating fins in a snake shape.

And the top cover is provided with a gas discharge valve for balancing the internal and external air pressures of the box body.

The liquid level of the fire extinguishing coolant submerges the connecting sheet of the pole of the battery cell and is 5-20 mm away from the top cover.

And a second explosion-proof valve is arranged on the top cover.

The utility model has the advantages of it is following and beneficial effect:

1. the utility model discloses a lithium ion battery submergence is in the coolant of putting out a fire, and the coolant of putting out a fire has insulating characteristics, and electric core and electric part contact in can direct and the battery package, therefore the temperature of each point in the battery package all is unanimous, can avoid the risk of lithium ion battery burning explosion, has improved the security of battery package.

2. The utility model discloses a coolant of putting out a fire has insulating and low boiling characteristics, can absorb a large amount of heats through the phase transition, therefore heat conduction cooling efficiency is high.

3. The utility model discloses a cooling system is in the outside of battery package, consequently can not exert an influence to the volume in the battery package and structure, consequently the design is simple, and the overall arrangement is nimble, sparingly materials.

Drawings

FIG. 1 is a view of the split structure of the present invention;

fig. 2 is a heat dissipation structure diagram of the coolant of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

As shown in fig. 1, a sealed heat-dissipating battery pack includes a case 1, a battery module 2, and a top cover 3; the box 1 is a cover-free sealed box, the battery module 2 is placed in the box 1, and the top cover 3 is fixed on the upper portion of the box 1. The battery module 2 comprises a bottom clapboard 21, a battery core 22 and an upper clapboard 23; bottom baffle 21 is placed on the bottom surface in box 1, is equipped with a plurality of spaced fixed slots on the bottom baffle 21, and every electric core 22 is fixed in a fixed slot, and a plurality of electric cores are in the same place through the connection piece cluster parallel, and last baffle 23 is placed on electric core 22 upper portion, and the positive and negative utmost point post of electric core 22 passes last baffle 23 to expose first explosion-proof valve. The first explosion-proof valve is a battery explosion-proof valve. The top cover 3 is connected with the box body 1 through bolts and sealed through sealant.

And a liquid feeding hole 36 is formed in the top cover 3 and used for injecting fire extinguishing coolant into the box body, and the liquid level of the fire extinguishing coolant is 5-20 mm away from the top cover and is beyond the connecting sheet of the pole of the electric core 22. The top cover 3 is provided with a gas discharge valve 37 for balancing the internal and external pressures of the tank 1.

The side of the box body 1 is fixed with a BMS all-in-one machine 4 for collecting information such as battery voltage, temperature and the like and managing the battery.

As shown in fig. 2, the top surface of the top cover 3 is a raised fin-shaped heat sink 34. Water cooling means are squashed between the fin fins 34. The water cooling device comprises a water inlet 31, a cooling water pipeline 33 and a water outlet 32; the water inlet 31 and the water outlet 33 are provided outside the fin fins 34, and the cooling water pipe 33 is wound in a serpentine shape in the gaps of the fin fins 34. The top cover 3 is also provided with a second explosion-proof valve 35 which is a pack explosion-proof valve.

The utility model discloses an assembly process as follows:

1) firstly, a box body 1 of a battery pack is of a hollow structure, a bottom clapboard 2 is put into the box body, and electric cores 22 of lithium ion batteries are arranged in the bottom clapboard 2 at intervals; after the lithium ion batteries are arranged, the upper partition plate 23 is covered, and the upper partition plate 23 plays a role in spacing and fixing the battery cell 22; then, the cells 22 of the lithium ion battery are connected in series and in parallel through the connecting sheet for combination.

2) When the structure of the upper partition 23 is designed, we need to design the slot according to the size of the corresponding battery cell 22, so that the positive and negative poles of the battery cell 22 and the explosion-proof valve are completely exposed.

3) After the arrangement, fixation and connection of the battery cells 22 are completed, the corresponding acquisition wire harness and the corresponding electric devices are installed.

4) After the arrangement in the pack bag body is completed, the top cover 3 is covered, the top cover 3 and the box body 1 are fixed through bolts, and sealing glue is adopted for sealing.

5) A liquid adding hole is formed in the top cover 3, and fire extinguishing coolant is injected into the box body 1 to a corresponding position from the liquid adding hole. A part of gap is left between the liquid surface and the top cover 3. The top surface of the top cover 3 adopts a fin-shaped design, and a heat dissipation surface is increased. The fins are hollow and connected, and external cooling water can pass through the fins to conduct heat. An explosion-proof valve and a gas discharge valve are arranged on the top cover 3. The explosion-proof valve is used for explosion-proof pressure relief when the temperature in the battery pack rises too fast to generate a large amount of gas. The gas exhaust valve is used for balancing the air pressure between the battery box body and the outside.

When the battery pack normally works, all batteries and electric parts are immersed in the fire extinguishing cooling liquid, so that the temperatures of all batteries are consistent, when the temperature rises, the fire extinguishing cooling liquid is changed from a liquid state to a gaseous state due to the low boiling point of the fire extinguishing cooling liquid, absorbs a large amount of heat, rises to the upper cover of the box body, is condensed into the liquid state from the gaseous state when meeting low temperature, emits a large amount of heat and is conducted away by cooling water. Therefore, the battery pack can ensure that the temperature of the battery pack is always in a certain range and is uniformly distributed.

Claims

1. A sealed heat-dissipation battery pack is characterized by comprising a box body, a battery module and a top cover; the box body is a cover-free sealed box body, the battery module is placed in the box body, and the top cover is fixed on the upper part of the box body; the top cover is provided with a liquid feeding hole for injecting fire extinguishing coolant into the box body, and a gap is reserved between the liquid level of the fire extinguishing coolant and the top cover.

2. The sealed heat-dissipating battery pack according to claim 1, wherein the battery module comprises a bottom separator, a cell, and an upper separator; the bottom clapboard is placed on the bottom surface in the seal box body, a plurality of spaced fixing grooves are formed in the bottom clapboard, each battery cell is fixed in one fixing groove, a plurality of battery cells are combined in series and parallel through connecting pieces, the upper clapboard is placed on the upper portion of each battery cell, and the positive and negative poles of each battery cell penetrate through the upper clapboard to expose the first explosion-proof valve.

3. The sealed heat-dissipating battery pack according to claim 1, wherein the top cover is connected to the case by bolts and sealed by a sealant.

4. The sealed, heat-dissipating battery pack of claim 1, wherein the top cover has a raised fin-shaped heat sink on an upper surface thereof.

5. The sealed, heat-dissipating battery pack according to claim 4, wherein a water cooling means is convoluted between the finned fins.

6. The sealed, heat-dissipating battery pack according to claim 5, wherein the water cooling device comprises a water inlet, a cooling water pipe, and a water outlet; the water inlet and the water outlet are arranged outside the fin-shaped radiating fins, and the cooling water pipeline is wound in the gaps of the fin-shaped radiating fins in a snake shape.

7. The sealed heat-dissipating battery pack according to claim 1, wherein a gas discharge valve for balancing the pressure inside the case with the pressure outside is provided on the top cover.

8. The sealed heat-dissipation battery pack according to claim 2, wherein the liquid level of the fire extinguishing coolant is 5-20 mm above the top cover and over the connecting sheet of the pole of the battery cell.

9. The sealed, heat-dissipating battery pack according to claim 1, wherein the top cover is provided with a second explosion-proof valve.