Lithium battery with flame-retardant structure

Abstract

The utility model discloses a lithium battery with a flame-retardant structure, which comprises a first shell, a second shell and a built-in flame-retardant structure, and the first shell and the second shell can be buckled along a second direction to define an accommodating space for placing a plurality of groups of battery cells. The multiple groups of battery cells are arranged at intervals along the first direction. The built-in flame-retardant structure comprises a flame-retardant inner shell, first flame-retardant rubber and second flame-retardant rubber. The side, facing the second shell, of the first shell and the side, facing the first shell, of the second shell are each provided with a flame-retardant inner shell. And the first flame-retardant rubber is arranged on one side, facing the multiple groups of battery cells, of the flame-retardant inner shell. The second flame-retardant rubber is arranged between every two adjacent groups of battery cells, so that high temperature and flame between the batteries can be blocked when an accident occurs, and fire can be effectively prevented from spreading to the outside through the laid first flame-retardant rubber and the flame-retardant inner shell when the batteries are in thermal runaway or a fire disaster, so that the safety of the batteries and surrounding equipment is protected.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to a lithium battery with a flame retardant structure. Background Art

[0002] Lithium battery is a kind of battery that uses lithium metal or lithium alloy as positive and negative electrode materials and non-aqueous electrolyte solution. Due to the very active chemical properties of lithium metal, the processing, storage and use of lithium metal have very high environmental requirements. With the development of science and technology, lithium batteries have become mainstream. Lithium batteries usually have two shapes, cylindrical and square. The battery adopts a spiral winding structure inside, and uses a very fine and highly permeable polyethylene film isolation material between the positive and negative electrodes.

[0003] When using a lithium battery, if it collides with an external object, causing damage to the internal battery cell, or if it catches fire for other reasons, if the flame spreads, it may easily cause danger to the surrounding area. Therefore, it needs to be improved to make it easier to use. Utility Model Content

[0004] In order to overcome the above disadvantages, the purpose of the present invention is to provide a lithium battery with a flame retardant structure to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is a lithium battery with a flame retardant structure, comprising:

[0006] The first shell and the second shell are both extended along the first direction and arranged opposite to each other along the second direction, wherein the first direction is perpendicular to the second direction. The first shell and the second shell can be buckled together along the second direction to enclose a storage space for placing multiple groups of battery cells. The multiple groups of battery cells are arranged at intervals along the first direction.

[0007] The built-in flame retardant structure includes a flame retardant inner shell, a first flame retardant rubber and a second flame retardant rubber. The flame retardant inner shell is provided on the side of the first shell facing the second shell, and the flame retardant inner shell is provided on the side of the second shell facing the first shell. The first flame retardant rubber is provided on the side of the flame retardant inner shell facing the multiple groups of battery cells along the second direction. The second flame retardant rubber is provided on both sides of each group of battery cells along the first direction.

[0008] Preferably, the lithium battery with a flame retardant structure also includes an external flame retardant structure. The external flame retardant structure includes a ceramic fiber sheet and a grid. A filling groove is provided on the side of the first shell away from the second shell, and the filling groove is provided on the side of the second shell away from the first shell. The ceramic fiber sheet is provided in the filling groove, and the grid is provided on the side of the ceramic fiber sheet away from the multiple groups of battery cells.

[0009] Preferably, a plurality of explosion-proof valves are arranged on the top of the first housing along the third direction, the first direction, the second direction and the third direction are perpendicular to each other. The plurality of explosion-proof valves are arranged at intervals along the first direction and correspond to the positions of the plurality of battery cells.

[0010] Preferably, each explosion-proof valve comprises a mounting groove, a breathable membrane and a PC sheet. The mounting groove is arranged at the top of the explosion-proof valve. The breathable membrane is arranged at the mounting groove. The PC sheet is arranged at the top of the breathable membrane.

[0011] Preferably, fixing pins are installed at the corners of the PC sheet for connecting with the first shell.

[0012] Preferably, the bottom of the first shell and both ends along the first direction are provided with snap rings, and the bottom of the second shell and both ends along the first direction are provided with snap blocks corresponding to the positions of the snap rings, which are used to fix the first shell and the second shell by snapping the snap rings with the snap blocks.

[0013] Preferably, the second flame-retardant rubber is provided at both ends of each group of battery cells along the second direction and at both ends along the third direction.

[0014] Preferably, the flame-retardant inner shell and the first shell and the second shell are all integrated structures.

[0015] Preferably, a circuit board is provided at the top of the plurality of groups of battery cells, and a wiring harness hole is provided at one end of the first shell and the second shell along the first direction.

[0016] Preferably, a maintenance window is provided on the top of the second shell.

[0017] Compared with the prior art, the lithium battery with a flame retardant structure provided by the utility model has the following beneficial effects:

[0018] 1. By providing a filling groove, a grid, a first flame-retardant rubber, a second flame-retardant rubber, an adhesive layer, a flame-retardant inner shell and a ceramic fiber sheet, a better flame-retardant effect is achieved. The second flame-retardant rubber is distributed between the battery cells, which can block the high temperature and flame between the batteries. The laying of the first flame-retardant rubber and the flame-retardant inner shell effectively blocks the fire from spreading to the outside. At the same time, the grid improves the strength of the shell, and with the distribution of the ceramic fiber sheet, it can effectively block the external high temperature and flame from spreading to the inside of the shell, so that the lithium battery has a better flame-retardant effect;

[0019] 2. The explosion-proof valve, breathable membrane, mounting groove, PC sheet and fixing pin are provided to achieve the effect of pressure relief and explosion prevention. The position of each group of explosion-proof valves corresponds to the position of each group of battery cells. When the battery cells are bloated, as the internal air pressure increases, they will spray outward, quickly increasing the air pressure inside the shell. The high-pressure gas will be discharged outward from the corresponding explosion-proof valve and discharged to the outside of the shell from the gap between the mounting groove and the PC sheet to relieve pressure, prevent the internal air pressure from being too high and causing explosion, thereby improving the safety of use;

[0020] 3. By providing a first shell, a second shell, a clamping block and a clamping ring, the shell can be quickly disassembled and assembled. The clamping ring can be put on the outside of the clamping block to form a clamping state, and cooperate with the distribution of the docking pins at the inner corner of the first shell to make the first shell and the second shell tightly spliced ​​together. By pushing the clamping ring outward, it can contact the clamping state with the clamping block, which is convenient for separating the first shell and the second shell, thereby making the shell easy to disassemble and assemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a three-dimensional diagram of an embodiment of a lithium battery with a flame retardant structure according to the utility model;

[0022] Figure 2 This is a schematic structural diagram of an embodiment of a lithium battery with a flame retardant structure according to the utility model;

[0023] Figure 3 A cross-sectional view of an embodiment of a lithium battery with a flame retardant structure according to the utility model Figure 1 , wherein is a partial cross-sectional view of the first shell in the front view direction;

[0024] Figure 4 A cross-sectional view of an embodiment of a lithium battery with a flame retardant structure according to the utility model Figure 2 , where is the partial cross-sectional view of the explosion-proof valve in the front view direction;

[0025] In the figure:

[0026] 1-lithium battery with flame retardant structure; 20-first shell; 21-second shell; 22-accommodating space; 23-clamp ring; 24-block; 30-flame retardant inner shell; 31-first flame retardant rubber; 32-second flame retardant rubber; 33-adhesion layer; 4-external flame retardant structure; 40-ceramic fiber sheet; 41-grid; 5-explosion-proof valve; 50-installation groove; 51-breathable membrane; 52-PC sheet; 53-fixing pin; 60-battery cell; 61-circuit board; 62-wiring harness hole; 63-maintenance window. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0028] refer to Figure 1 to Figure 3 , Figure 1 A three-dimensional diagram of a lithium battery 1 with a flame retardant structure provided by an embodiment of the utility model is shown; Figure 2 A schematic structural diagram of a lithium battery 1 with a flame retardant structure provided by an embodiment of the utility model is shown; Figure 3 The cross-sectional view of a lithium battery 1 with a flame retardant structure provided by the embodiment of the utility model is shown. Figure 1 , wherein is a partial cross-sectional view of the first shell 20 in the front view direction.

[0029] like Figure 1 and Figure 2 As shown, the technical solution adopted by the utility model is a lithium battery 1 with a flame retardant structure, comprising a first shell 20, a second shell 21 and a built-in flame retardant structure, wherein the first shell 20 and the second shell 21 are both along a first direction ( Figure 1 X direction) and along the second direction ( Figure 1 The first shell 20 and the second shell 21 are arranged relative to each other (as shown in the Y direction), and the first direction is perpendicular to the second direction. The first shell 20 and the second shell 21 can be buckled together along the second direction to enclose a receiving space 22 for placing multiple groups of battery cells 60. Multiple groups of battery cells 60 are arranged at intervals along the first direction. The built-in flame retardant structure includes a flame retardant inner shell 30, a first flame retardant rubber 31 and a second flame retardant rubber 32. A flame retardant inner shell 30 is provided on the side of the first shell 20 facing the second shell 21, and a flame retardant inner shell 30 is provided on the side of the second shell 21 facing the first shell 20. The first flame retardant rubber 31 is provided on the side of the flame retardant inner shell 30 facing the multiple groups of battery cells 60 along the second direction. The second flame retardant rubber 32 is provided on both sides of each group of battery cells 60 along the first direction.

[0030] The utility model provides a lithium battery 1 with a flame-retardant structure, wherein the flame-retardant inner shell 30, the first flame-retardant rubber 31 and the second flame-retardant rubber 32 are all made of materials with excellent flame-retardant properties. By distributing the second flame-retardant rubber 32 between the battery cells 60, the high temperature and flame between the batteries can be blocked in the event of an accident. By laying the first flame-retardant rubber 31 and the flame-retardant inner shell 30, the fire can be effectively prevented from spreading to the outside when the battery has thermal runaway or fire, thereby protecting the safety of the battery and surrounding equipment. Specifically, an adhesive layer 33 is provided between the first flame-retardant rubber 31 and the flame-retardant inner shell 30 for adhering the first flame-retardant rubber 31.

[0031] In some embodiments, reference Figure 1 and Figure 2The lithium battery 1 with a flame retardant structure also includes an external flame retardant structure 4. The external flame retardant structure 4 includes a ceramic fiber sheet 40 and a grid 41. A filling groove is provided on the side of the first shell 20 away from the second shell 21, and a filling groove is provided on the side of the second shell 21 away from the first shell 20. The ceramic fiber sheet 40 is provided in the filling groove, and the grid 41 is provided on the side of the ceramic fiber sheet 40 away from the multiple groups of battery cells 60.

[0032] For example, the ceramic fiber sheet 40 has the characteristics of high temperature resistance and excellent fire resistance, and is used to provide an effective thermal barrier in a high temperature or even flame environment to prevent the spread of heat or flame inside the battery, thereby making the lithium battery have a better flame retardant effect. The setting of the grid 41 can not only protect the ceramic fiber sheet 40, but also prevent the fragments or gas inside the battery from rushing out of the battery when the battery explodes in extreme cases, causing more serious injuries or damage.

[0033] The lithium battery with a flame-retardant structure provided in the present application greatly improves the safety and stability of the battery through the dual protection of the internal and external flame-retardant structures 4, reduces the risk of fire or explosion of the battery during use, and provides strong protection for the safety of people's lives and property.

[0034] refer to Figure 4 , Figure 4 The cross-sectional view of a lithium battery 1 with a flame retardant structure provided by the embodiment of the utility model is shown. Figure 2 , wherein it is a partial cross-sectional view of the explosion-proof valve 5 in the front view direction.

[0035] In some embodiments, reference Figure 4 Combined with Figure 2 As shown, the first housing 20 is arranged along the third direction ( Figure 1 A plurality of explosion-proof valves 5 are arranged on the top of the battery pack 60 (shown in the Z direction), and the first direction, the second direction and the third direction are perpendicular to each other. The plurality of explosion-proof valves 5 are arranged at intervals along the first direction and correspond to the positions of the plurality of battery cells 60.

[0036] Each explosion-proof valve 5 includes a mounting groove 50, a breathable membrane 51 and a PC sheet 52. The mounting groove 50 is arranged at the top of the explosion-proof valve 5. The breathable membrane 51 is arranged at the mounting groove 50. The PC sheet 52 is arranged at the top of the breathable membrane 51.

[0037] Fixing pins 53 are installed at the corners of the PC sheet 52 for connecting with the first housing 20 .

[0038] Exemplarily, by setting the explosion-proof valve 5, the breathable membrane 51, the mounting groove 50, the PC sheet 52 and the fixing pin 53, the effect of pressure relief and explosion prevention is achieved. The position of each group of explosion-proof valves 5 corresponds to the position of each group of battery cells 60. When the battery cells 60 are bloated, as the internal air pressure increases, they will spray outward, quickly increasing the air pressure inside the shell. The high-pressure gas will be discharged outward from the corresponding explosion-proof valve 5 and discharged to the outside of the shell from the gap between the mounting groove 50 and the PC sheet 52 to relieve pressure, prevent the internal air pressure from being too high and causing explosion, thereby improving the safety of use. The fixing pin 53 is threadedly connected to the first shell 20, and multiple groups of explosion-proof valves 5 are provided, and the position of the explosion-proof valve 5 corresponds to the position of the battery cells 60, so as to facilitate the rapid exhaust and pressure relief of each group of battery cells 60.

[0039] In some embodiments, reference Figure 1 and Figure 2 A snap ring 23 is provided at the bottom and both ends along the first direction of the first shell 20, and a clamping block 24 corresponding to the position of the snap ring 23 is provided at the bottom and both ends along the first direction of the second shell 21, which is used to fix the first shell 20 and the second shell 21 by clamping and connecting with the clamping block 24 through the snap ring 23.

[0040] For example, the snap-fit ​​structure formed by the multiple clamping blocks 24 and the multiple snap rings 23 realizes the rapid disassembly and assembly of the housing. The snap ring 23 can be sleeved on the outside of the clamping block 24 and be in a snap-fit ​​state therewith, and cooperate with the distribution of the docking pins at the inner corners of the first housing 20 to tightly splice the first housing 20 and the second housing 21 together. When the snap ring 23 is pushed outward, the snap ring 23 can be separated from the clamping block 24, and the first housing 20 can be separated from the second housing 21, so that the entire housing is easy to disassemble and assemble.

[0041] In some embodiments, reference Figure 1 and Figure 2 The second flame retardant rubber 32 is provided at both ends of each group of battery cells 60 along the second direction and at both ends along the third direction.

[0042] Exemplarily, by disposing the second flame retardant rubber 32 around the battery cell 60 , each battery cell 60 is fully protected.

[0043] In some embodiments, the flame retardant inner shell 30 and the first shell 20 and the second shell 21 are all integrated structures.

[0044] For example, the flame retardant inner shell 30 is integrated with the first shell 20 and the second shell 21, which has better structural stability and impact resistance. In addition, the grille 41 is integrated with the first shell 20 and the second shell 21, the clamping ring 23 is integrated with the first shell 20, and the clamping block 24 is integrated with the second shell 21.

[0045] In some embodiments, reference Figure 1 and Figure 2 A circuit board 61 is disposed at the top of the plurality of battery cells 60 , and a harness hole 62 is disposed at one end of the first shell 20 and the second shell 21 along the first direction. The external control circuit is connected to the circuit board 61 through the harness hole 62 .

[0046] In some embodiments, reference Figure 1 and Figure 2 A maintenance window 63 is provided on the top of the second housing 21 to facilitate quick maintenance inspection.

[0047] The above implementation modes are only for illustrating the technical concept and features of the utility model, and their purpose is to allow people familiar with this technology to understand the content of the utility model and implement it. It cannot be used to limit the protection scope of the utility model. All equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A lithium battery with a flame retardant structure, characterized in that: include: The first shell and the second shell both extend along a first direction and are arranged opposite to each other along a second direction, wherein the first direction is perpendicular to the second direction; the first shell and the second shell can be buckled together along the second direction to enclose a receiving space for placing multiple groups of battery cells; the multiple groups of battery cells are arranged at intervals along the first direction; A built-in flame-retardant structure comprises a flame-retardant inner shell, a first flame-retardant rubber and a second flame-retardant rubber; the flame-retardant inner shell is provided on a side of the first shell facing the second shell, and the flame-retardant inner shell is provided on a side of the second shell facing the first shell; the first flame-retardant rubber is provided on a side of the flame-retardant inner shell facing the multiple groups of battery cells along the second direction; the second flame-retardant rubber is provided on both sides of each group of battery cells along the first direction.

2. The lithium battery with a flame retardant structure according to claim 1, characterized in that: It also includes an external flame retardant structure; the external flame retardant structure includes a ceramic fiber sheet and a grid; a filling groove is provided on the side of the first shell away from the second shell, and the filling groove is provided on the side of the second shell away from the first shell; the ceramic fiber sheet is provided in the filling groove, and the grid is provided on the side of the ceramic fiber sheet away from the multiple groups of battery cells.

3. The lithium battery with a flame retardant structure according to claim 1, characterized in that: A plurality of explosion-proof valves are arranged at the top of the first shell along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other; the plurality of explosion-proof valves are arranged at intervals along the first direction and correspond to the positions of the plurality of battery cell groups.

4. The lithium battery with a flame retardant structure according to claim 3, characterized in that: Each explosion-proof valve comprises a mounting groove, a breathable membrane and a PC sheet; the mounting groove is arranged at the top of the explosion-proof valve; the breathable membrane is arranged at the mounting groove; and the PC sheet is arranged at the top of the breathable membrane.

5. The lithium battery with a flame retardant structure according to claim 4, characterized in that: Fixing pins are installed at the corners of the PC sheet for connecting with the first shell.

6. The lithium battery with a flame retardant structure according to claim 1, characterized in that: The bottom of the first shell and both ends along the first direction are provided with snap rings, and the bottom of the second shell and both ends along the first direction are provided with snap blocks corresponding to the positions of the snap rings, which are used to fix the first shell and the second shell by snapping and connecting with the snap blocks through the snap rings.

7. The lithium battery with a flame retardant structure according to claim 1, characterized in that: The second flame-retardant rubber is provided at both ends of each group of battery cells along the second direction and at both ends along the third direction.

8. The lithium battery with a flame retardant structure according to claim 1, characterized in that: The flame-retardant inner shell and the first shell and the second shell are all integrated structures.

9. The lithium battery with a flame retardant structure according to claim 1, characterized in that: A circuit board is provided at the top of the plurality of groups of battery cells, and a wiring harness hole is provided at one end of the first shell and the second shell along the first direction.

10. The lithium battery with a flame retardant structure according to claim 1, characterized in that: A maintenance window is provided on the top of the second shell.

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