An explosive shell and lithium battery

Abstract

The utility model relates to a kind of blastable shell and lithium battery, it includes shell body and blasting assembly;The outer wall of the shell body has a weak area;The blasting assembly includes annular projection, deformation part and needle, the annular projection is fixedly connected with the inner wall of the shell body and is set opposite the weak area, the deformation part is fixedly connected with the annular projection, and the deformation part side close to the weak area is connected with the needle, the deformation part can be turned over upwards and drive the needle to move close to the weak area under the pressure action in the shell body;When the pressure in shell body is too large, deformation part turns over upwards and thus drives the needle to move close to the weak area until puncture weak area, so as to release the pressure in shell body, prevent explosion.

Description

Technical Field

[0001] This utility model relates to the field of new energy battery system technology, and in particular to a blastable shell and a lithium battery. Background Technology

[0002] Lithium-ion battery systems have high energy density and are widely used in energy storage, communication and power battery fields. Existing lithium-ion battery systems are generally designed with a breathable membrane to facilitate the venting and heat exchange of the lithium-ion battery system.

[0003] For example, utility model patent application CN201320296044.4 proposes a lithium battery pack housing for preventing overheating of lithium batteries. The housing includes a casing with an air inlet and an air outlet on its side wall. Both the air inlet and outlet have a waterproof and breathable membrane on their inner sides, which is fixed to the inner side of the casing. Because the waterproof and breathable membrane is attached to the inner sides of the air inlet and outlet, water molecules in the air are isolated, allowing relatively dry air to enter the casing to cool the lithium battery. This prevents the lithium battery from overheating during operation, increasing its performance and lifespan. It also avoids long-term corrosion of the lithium battery casing by moisture in the air during cooling, which could lead to leakage.

[0004] However, when a lithium battery system experiences thermal runaway, its casing does not have the function of directional explosion, and the heat inside the lithium battery system is concentrated, posing a safety hazard. Utility Model Content

[0005] In view of this, it is necessary to provide a burstable casing and lithium battery to solve the problem that when a lithium battery system experiences thermal runaway, its casing does not have the function of directional bursting, and the heat inside the lithium battery system is concentrated, posing a safety hazard.

[0006] On one hand, this utility model embodiment provides a burstable shell, including a shell body and a bursting component; the outer wall of the shell body has a weak area; the bursting component includes an annular protrusion, a deformable part and a needle, the annular protrusion is fixedly connected to the inner wall of the shell body and is disposed facing the weak area, the deformable part is fixedly connected to the annular protrusion, and the side of the deformable part near the weak area is connected to the needle, the deformable part can be flipped upward under the pressure inside the shell body and drive the needle to move closer to the weak area.

[0007] Furthermore, the thickness of the weak area of ​​the outer shell body is less than the thickness of the rest of the outer shell body.

[0008] Furthermore, when the internal pressure of the outer shell body is less than a preset value, the deformable part is a downwardly convex conical structure; when the internal pressure of the outer shell body is greater than the preset value, the deformable part is an upwardly convex conical structure.

[0009] Furthermore, the outer edge of the deformable part is fixedly connected to the inner wall of the annular protrusion, and the deformable part is provided with a groove. When the internal pressure of the outer shell body is greater than a preset value, the groove of the deformable part will break.

[0010] Furthermore, the needle is vertically positioned, and the bottom end of the needle is fixedly connected to the tip of the top of the deformable part.

[0011] Furthermore, the outer casing includes a box body and a box cover, which are detachably connected, and the box cover has a weak area.

[0012] Furthermore, it also includes a breathable component installed on the outer casing.

[0013] Furthermore, the breathable component includes a breathable tube and a breathable membrane. The breathable tube is installed on the outer shell body and connects the interior of the outer shell body to the outside. The breathable membrane is installed inside the breathable tube.

[0014] Furthermore, it also includes a communication connector, a positive output connector, and a negative output connector disposed on the outer casing.

[0015] On the other hand, this utility model embodiment provides a lithium battery, including a burstable outer shell as described above, and a battery module, wherein the battery module is installed inside the outer shell.

[0016] Compared with existing technologies, when the internal pressure of the outer shell is too high, the deformable part flips upward, thereby driving the needle to move towards the weak area until it pierces the weak area, thereby releasing the pressure inside the outer shell and preventing an explosion. Attached Figure Description

[0017] Figure 1 A schematic diagram of the overall external structure of the explosive shell and lithium battery provided in this embodiment of the utility model;

[0018] Figure 2 A schematic diagram of the overall internal structure of the explosive outer shell and lithium battery provided in an embodiment of this utility model;

[0019] Figure 3 for Figure 2 Enlarged schematic diagram of part A in the middle. Detailed Implementation

[0020] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0021] like Figure 1-3 As shown, in one aspect, this utility model embodiment provides a burstable shell, including a shell body 100 and a bursting component 200; the outer wall of the shell body 100 has a weak region 10a opening; the bursting component 200 includes an annular protrusion 210, a deformable part 220 and a needle 230, the annular protrusion 210 is fixedly connected to the inner wall of the shell body 100 and is positioned directly opposite the weak region 10a, the deformable part 220 is fixedly connected to the annular protrusion 210, and the side of the deformable part 220 near the weak region 10a is connected to the needle 230, the deformable part 220 can be flipped upward under the pressure inside the shell body 100 and drive the needle 230 to move towards the weak region 10a.

[0022] During implementation, when the pressure inside the outer shell 100 is too high, the deformable part 220 flips upward, thereby driving the needle 230 to move towards the weak area 10a until it pierces the weak area 10a, thereby releasing the pressure inside the outer shell 100 and preventing an explosion.

[0023] In this embodiment, the outer casing 100 serves as the external protective structure for the lithium battery. In one embodiment, the outer casing 100 includes a housing 110 and a cover 120, which are detachably connected. The cover 120 has a vulnerable area 10a.

[0024] In this embodiment, the blasting component 200 is mounted on the outer casing 100. When the pressure inside the outer casing 100 is too high, the blasting component 200 can quickly release the pressure inside the outer casing 100. Specifically, the blasting component 200 includes an annular protrusion 210, a deformation part 220, and a needle 230. The annular protrusion 210 is fixedly connected to the inner wall of the outer casing 100 and is positioned directly opposite the weak area 10a. The deformation part 220 is fixedly connected to the annular protrusion 210, and the side of the deformation part 220 closest to the weak area 10a is connected to the needle 230. Under the pressure inside the outer casing 100, the deformation part 220 can flip upward and drive the needle 230 to move closer to the weak area 10a.

[0025] The thickness of the weak region 10a of the outer shell body 100 is less than the thickness of the rest of the outer shell body 100. In one embodiment, the thickness of the weak region 10a of the outer shell body 100 is 1 / 10 to 1 / 20 of the wall thickness of the rest of the outer shell body 100.

[0026] It is understood that the annular protrusion 210 in this embodiment can be provided on the housing 110 or the cover 120, as long as the deformable part 220 on the annular protrusion 210 is directly facing the weak area 10a of the outer shell body 100.

[0027] In this embodiment, a pressure-bearing cavity is formed between the deformable part 220, the annular protrusion 210, and the weak region 10a. When the pressure inside the outer shell 100 is high, the deformable part 220 is subjected to a squeezing force that causes it to flip towards the pressure-bearing cavity, thereby driving the needle 230 to move. Specifically, when the pressure inside the outer shell 100 is less than a preset value, the deformable part 220 has a downwardly protruding conical structure; when the pressure inside the outer shell 100 is greater than the preset value, the deformable part 220 has an upwardly protruding conical structure.

[0028] To facilitate the discharge of gas from the outer shell 100, the outer edge of the deformable part 220 in this embodiment is fixedly connected to the inner wall of the annular protrusion 210. The deformable part 220 is provided with a notch 221. When the pressure inside the outer shell 100 is greater than a preset value, the deformable part 220 will break at the notch 221.

[0029] It is understood that this application does not limit the shape of the notch 221, and it can be circular, C-shaped or X-shaped, etc.

[0030] Of course, in other preferred embodiments, the thickness of the deformable part 220 can be controlled. When the pressure inside the outer shell body 100 is large, the deformable part 220 is pre-ruptured, causing the needle 230 to puncture the weak area 10a of the outer shell body 100.

[0031] The needle 230 is vertically arranged, and the bottom end of the needle 230 is fixedly connected to the tip of the top of the deformable part 220.

[0032] This embodiment also includes a breathable assembly 300 installed on the housing body 100.

[0033] In one embodiment, the breathable component 300 includes a breathable tube 310 and a breathable membrane 320. The breathable tube 310 is mounted on the housing body 100 and connects the interior and exterior of the housing body 100. The breathable membrane 320 is mounted inside the breathable tube 310.

[0034] This embodiment also includes a communication connector 400, a positive output connector 500, and a negative output connector 600 disposed on the housing body 100.

[0035] On the other hand, this utility model embodiment provides a lithium battery, including the explosive shell as described above, and also includes a battery module, which is installed inside the shell body 100.

[0036] Compared with the prior art: when the pressure inside the outer shell 100 is too high, the deformable part 220 flips upward, thereby driving the needle 230 to move towards the weak area 10a until it punctures the weak area 10a, thereby releasing the pressure inside the outer shell 100 and preventing an explosion.

[0037] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A burstable outer shell, characterized in that, include: The outer shell has a weak area on its outer wall; The explosive assembly includes an annular protrusion, a deformable portion, and a needle. The annular protrusion is fixedly connected to the inner wall of the outer shell body and is positioned directly opposite the weak area. The deformable portion is fixedly connected to the annular protrusion, and the side of the deformable portion closest to the weak area is connected to the needle. Under pressure within the outer shell body, the deformable portion can deform upwards and drive the needle to move closer to the weak area.

2. The explosive shell according to claim 1, characterized in that, The thickness of the weak area of ​​the outer shell body is less than the thickness of the rest of the outer shell body.

3. The explosive shell according to claim 1, characterized in that, When the internal pressure of the outer shell body is less than a preset value, the deformation part is a downwardly convex conical structure; when the internal pressure of the outer shell body is greater than the preset value, the deformation part is an upwardly convex conical structure.

4. The explosive shell according to claim 3, characterized in that, The outer edge of the deformable part is fixedly connected to the inner wall of the annular protrusion. The deformable part is provided with a groove. When the internal pressure of the outer shell body is greater than a preset value, the groove of the deformable part will break.

5. The explosive shell according to claim 3, characterized in that, The needle is set vertically, and the bottom end of the needle is fixedly connected to the tip of the top of the deformable part.

6. The explosive shell according to claim 1, characterized in that, The outer casing includes a box body and a box cover, which are detachably connected. The box cover has a weak area.

7. The explosive shell according to claim 1, characterized in that, It also includes a breathable component installed on the outer casing.

8. The explosive shell according to claim 7, characterized in that, The breathable component includes a breathable tube and a breathable membrane. The breathable tube is installed on the outer shell body and connects the inside of the outer shell body to the outside. The breathable membrane is installed inside the breathable tube.

9. The explosive shell according to claim 1, characterized in that, It also includes a communication connector, a positive output connector, and a negative output connector disposed on the outer casing.

10. A lithium battery, characterized in that, The device includes a burstable housing as described in any one of claims 1-9, and further includes a battery module installed within the housing body.

Images