A lithium battery module with multiple safety insurance mechanisms

Abstract

The utility model relates to a lithium battery module with multiple safety insurance mechanisms, comprising a multi-layer protective shell and a collection pool, the multi-layer protective shell comprising an inner shell, a middle shell and an outer shell, the inner shell is provided with a first opening, the first opening is arranged upward, a plurality of isolation plates are arranged in the first opening, a plurality of drainage units are arranged on the lower side of the inner shell, the sides of the inner shell are provided with pressure relief connecting plates, the surface of the middle shell is provided with a snap-on strip, the snap-on strip is used to snap-on with the pressure relief connecting plate, the pressure relief connecting plate is provided with a pressure relief groove, the outer shell is provided with a accommodating chamber, the bottom of the outer shell is provided with a V-shaped guide block, the bottom of the outer shell is also provided with a collection pool, through the three-layer shell structure of the inner shell, the middle shell and the outer shell and in conjunction with the guide groove, the abnormal lithium batteries are efficiently depressurized, diverted and collected.

Description

Technical Field

[0001] The utility model relates to a lithium battery module with multiple safety insurance mechanisms. Background Art

[0002] With the rapid development of lithium battery technology, it has been widely used in electric vehicles, portable electronic devices, renewable energy storage systems and other fields. However, the safety of lithium batteries has always been the focus of attention. Lithium batteries may experience thermal runaway, combustion or even explosion under abnormal conditions such as overcharge, over-discharge, short circuit, mechanical shock, high temperature, etc., posing a threat to personnel safety and equipment integrity.

[0003] In order to improve the safety of lithium batteries, researchers and engineers have developed a variety of safety insurance mechanisms, such as battery management systems (BMS), thermal management systems, mechanical protection structures, fault diagnosis technologies, etc. These technologies can improve the safety performance of lithium batteries to a certain extent, but their safety insurance capabilities still need to be further improved, especially in the face of extreme working conditions. Traditional lithium battery modules are usually protected by a single-layer hard shell. This design may not be able to effectively prevent accidents when encountering serious faults such as battery thermal runaway. Therefore, it is of great practical significance to develop a lithium battery module with multiple safety insurance mechanisms that can protect the battery and the surrounding environment under multiple fault modes.

[0004] Therefore, in this context, a lithium battery module with a multi-layer protective shell and a collection pool is needed, which needs to integrate multiple safety insurance mechanisms such as pressure relief, diversion, and collection to improve the safety of the lithium battery module under abnormal working conditions. Utility Model Content

[0005] The purpose of the utility model is to solve the deficiencies of the above prior art and provide a lithium battery module with multiple safety insurance mechanisms. Through the three-layer shell structure of the inner shell, the middle shell and the outer shell and the guide groove, the abnormal lithium batteries can be efficiently depressurized, guided and collected. The following is a specific solution:

[0006] A lithium battery module with multiple safety insurance mechanisms comprises a multi-layer protective shell and a collection pool, wherein the multi-layer protective shell comprises an inner shell, a middle shell and an outer shell, the inner shell is provided with a first opening, the first opening is arranged upward, a plurality of isolation plates are arranged in the first opening, a plurality of drainage units are arranged on the lower side of the inner shell, the middle shell is provided with a second opening, the second opening is arranged downward, the second opening can accommodate the inner shell, the sides of the inner shell are provided with pressure relief connecting plates, the surface of the middle shell is provided with a snap-on strip, the snap-on strip is used to snap-on with the pressure relief connecting plate, the pressure relief connecting plate is provided with a pressure relief groove, the outer shell is provided with an accommodating chamber, the inner wall in the accommodating chamber is provided with a first connecting piece, the middle shell is provided with a second connecting piece, the first connecting piece can be fixed in the second connecting piece, a V-shaped guide block is provided at the bottom of the outer shell, and a collection pool is also provided at the bottom of the outer shell.

[0007] In order to increase the drainage area and allow the electrolyte of the faulty battery to be better discharged downward, the drainage unit is a long strip-shaped notch.

[0008] The design that can move up and down can provide a certain pressure relief space when the internal pressure of the battery increases, thereby reducing the risk of explosion. The position setting of the pressure relief connecting plate on the inner shell and the clamping strip on the middle shell can enable the inner shell to move up and down in a limited manner inside the middle shell.

[0009] For easy installation, the first connecting member and the second connecting member are connected by bolts.

[0010] In order to facilitate the discharge of collected liquid during inspection and maintenance, a discharge port is provided on one side of the collection tank.

[0011] In order to increase the pressure relief area, which helps to quickly release the pressure when the internal pressure of the battery increases sharply, the pressure relief groove is a long strip-shaped groove.

[0012] Beneficial effects: The protection of the three-layer shell increases the robustness of the physical structure; the isolation plate in the first opening can reduce the impact of faulty batteries on other battery packs and prevent the accident from expanding; the pressure relief connecting plate and the card strip design between the inner shell and the middle shell allow the inner shell to move in a limited manner in the middle shell, which helps to provide a certain safe pressure relief space when the internal pressure increases; the long pressure relief grooves on the pressure relief connecting plate provide more pressure relief area, which helps to quickly release pressure when the internal pressure increases sharply and reduce the risk of explosion; the V-shaped guide block at the bottom of the outer shell helps to guide the liquid to the collection pool and improve the efficiency of liquid collection; through the cooperation of the pressure relief connecting plate and the drainage unit, the high-pressure gas and liquid are jointly relieved, the loss of the accident is reduced, and the overflow of high-pressure liquid and gas is avoided to cause the accident to expand. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1It is a three-dimensional structural schematic diagram of the inner shell of a lithium battery module with multiple safety insurance mechanisms;

[0014] Figure 2 It is a schematic diagram of the explosion structure of a lithium battery module with multiple safety insurance mechanisms;

[0015] Figure 3 It is a schematic diagram of the explosion structure of a lithium battery module with multiple safety insurance mechanisms from another perspective;

[0016] In the figure: 101, multi-layer protective shell, 1, inner shell, 1-1, first opening, 1-2, isolation plate, 1-3, drainage unit, 1-4, pressure relief connecting plate, 1-4-1, pressure relief groove, 2, middle shell, 2-1, second opening, 2-2, snap-in strip, 2-3, second connecting piece, 3, outer shell, 3-1, accommodating chamber, 3-2, first connecting piece, 3-4, guide block, 3-5, collecting tank, 3-6, discharge outlet. DETAILED DESCRIPTION

[0017] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0018] In this embodiment:

[0019] Please see Figure 1-3 A lithium battery module with multiple safety insurance mechanisms includes a multi-layer protective shell 101 and a collection pool 3-5. The multi-layer protective shell 101 includes an inner shell 1, a middle shell 2 and an outer shell 3. The inner shell 1 is provided with a first opening 1-1, the first opening 1-1 is set upward, and a plurality of isolation plates 1-2 are arranged in the first opening 1-1. A plurality of drainage units 1-3 are arranged on the lower side of the inner shell 1. The middle shell 2 is provided with a second opening 2-1, the second opening 2-1 is set downward, and the second opening 2-1 can accommodate the inner shell 1. The sides of the inner shell 1 are A pressure relief connecting plate 1-4 is provided, and a snap-in strip 2-2 is provided on the surface of the middle shell 2. The snap-in strip 2-2 is used to snap-in with the pressure relief connecting plate 1-4. A pressure relief groove 1-4-1 is provided on the pressure relief connecting plate 1-4. The outer shell 3 is provided with an accommodating chamber 3-1. The inner wall of the accommodating chamber 3-1 is provided with a first connecting member 3-2. The middle shell 2 is provided with a second connecting member 2-3. The first connecting member 3-2 can be fixed in the second connecting member 2-3. A V-shaped guide block 3-4 is provided at the bottom of the outer shell 3, and a collecting pool 3-5 is also provided at the bottom of the outer shell 3.

[0020] In order to increase the drainage area and allow the electrolyte of the faulty battery to be better discharged downward, the drainage unit 1-3 is a long strip-shaped notch.

[0021] The design that can move up and down can provide a certain pressure relief space when the internal pressure of the battery increases, thereby reducing the risk of explosion. The position setting of the pressure relief connecting plate 1-4 on the inner shell 1 and the clamping strip 2-2 on the middle shell 2 can enable the inner shell 1 to move up and down in a limited manner in the middle shell 2.

[0022] For ease of installation, the first connecting member 3-2 and the second connecting member 2-3 are connected by bolts; in order to facilitate the discharge of collected liquid during inspection and maintenance, a discharge port 3-6 is provided on one side of the collecting tank 3-5; in order to increase the pressure relief area and help to quickly release the pressure when the internal pressure of the battery increases sharply, the pressure relief groove 1-4-1 is a long strip-shaped groove.

[0023] The following are the specific implementation methods and principles:

[0024] During installation, first connect the inner shell 1 and the middle shell 2, first put the inner shell 1 into the middle shell 2, then fix the clamping strip 2-2 to the middle shell 2, the inner shell 1 is clamped into the middle shell 2, then put the middle shell 2 into the outer shell 3, and connect the first connecting piece 3-2 and the second connecting piece 2-3 by bolts;

[0025] When a lithium battery fails, it will release a large amount of high-pressure gas, which will be discharged through the pressure relief groove 1-4-1 in the pressure relief connection plate between the inner shell 1 and the outer shell 3. When the pressure is too high, the inner shell 1 will be lifted up, and the pressure will be reduced by the internal gas flow. Then the low-pressure gas after decompression will be discharged to the outside. When a lithium battery fails, it will also release a large amount of electrolyte. The electrolyte will enter the drainage unit 1-3 under the action of gravity, and will be discharged to the collection tank 3-5 in the outer shell 3 through the drainage unit 1-3. Some high-pressure electrolyte can also be discharged through the pressure relief groove 1-4-1 of the pressure relief connection plate to reduce the impact on other parallel battery packs. Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limited. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A lithium battery module with multiple safety insurance mechanisms, characterized in that: It includes a multi-layer protective shell and a collecting pool. The multi-layer protective shell includes an inner shell, a middle shell and an outer shell. The inner shell is provided with a first opening, which is arranged upward. A plurality of isolation plates are arranged in the first opening. A plurality of drainage units are arranged on the lower side of the inner shell. The middle shell is provided with a second opening, which is arranged downward. The second opening can accommodate the inner shell. The sides of the inner shell are provided with pressure relief connecting plates. The surface of the middle shell is provided with a snap-on strip, which is used to snap-on with the pressure relief connecting plate. A pressure relief groove is provided on the pressure relief connecting plate. The outer shell is provided with an accommodating chamber. The inner wall of the accommodating chamber is provided with a first connecting piece. The middle shell is provided with a second connecting piece. The first connecting piece can be fixed in the second connecting piece. The bottom of the outer shell is provided with a V-shaped guide block, and the bottom of the outer shell is also provided with a collecting pool.

2. A lithium battery module with multiple safety mechanisms according to claim 1, characterized in that , the drainage unit is a long strip-shaped slot.

3. A lithium battery module with multiple safety mechanisms according to claim 1, characterized in that: The positions of the pressure relief connecting plate on the inner shell and the clamping strip on the middle shell can enable the inner shell to move up and down in a limited manner in the middle shell.

4. A lithium battery module with multiple safety mechanisms according to claim 1, characterized in that: The first connecting member and the second connecting member are connected by bolts.

5. A lithium battery module with multiple safety mechanisms according to claim 1, characterized in that: A discharge port is provided on one side of the collecting tank.

6. A lithium battery module with multiple safety mechanisms according to claim 1, characterized in that: The pressure relief groove is a long strip-shaped groove.

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