Lithium battery structure

Abstract

The utility model discloses a lithium battery structure. The lithium battery structure comprises a battery cell and a shell, the interior of the shell is hollow and is used for accommodating the battery cell; an even number of brackets are arranged on one side, close to the battery cells, of the side surface of the bottom of the shell, and the battery cells are supported on the brackets; the brackets are arranged at intervals and are encircled to form an exhaust hole corresponding to the position of an anti-explosion valve of a battery cell, and the adjacent brackets are symmetrically arranged along the center of the exhaust hole; in the length direction of the shell, first exhaust channels communicated with the exhaust holes are further formed between the adjacent brackets. According to the scheme, the first exhaust channel is arranged, so that gas in the battery cell can flow to the exhaust hole through the first exhaust channel and is finally exhausted through the explosion-proof valve hole. And the bracket is positioned around the exhaust hole, so that the exhaust hole can be protected at the same time.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and more specifically, to a lithium battery structure. Background Technology

[0002] With the rapid development of the new energy industry, lithium-ion batteries and other new energy cell technologies have been widely used in electric vehicles, energy storage systems, and other fields. However, new energy cell technologies pose a risk of thermal runaway during use, which can lead to serious safety accidents. Thermal runaway refers to the generation of a large amount of heat inside the battery due to various reasons (such as overcharging, over-discharging, short circuits, etc.), causing the battery temperature to rise sharply, triggering a series of chemical reactions, and ultimately leading to dangerous situations such as battery fires and explosions. To reduce the risk of thermal runaway and improve the safety of new energy cell technologies, effective thermal control measures are needed.

[0003] Currently, common thermal control methods include optimizing battery design, using heat dissipation materials, and enhancing the battery management system. However, these methods may not fully meet thermal control requirements in some situations. For example, in high power density applications, heat is generated rapidly inside the battery, and traditional heat dissipation methods may struggle to effectively dissipate this heat. Utility Model Content

[0004] This invention provides a lithium battery structure that allows heat to be dissipated quickly from inside the battery cell.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] A lithium battery structure includes a battery cell and a casing; the casing is hollow inside to accommodate the battery cell; an even number of brackets are provided on the bottom side of the casing near the battery cell, and the battery cell is supported on the brackets; the brackets are spaced apart and together form an exhaust port corresponding to the position of the explosion-proof valve of the battery cell, while adjacent brackets are symmetrically arranged along the center of the exhaust port; along the length direction of the casing, a first exhaust channel communicating with the exhaust port is also formed between adjacent brackets.

[0007] In this design, a first venting channel is provided, allowing the gas inside the battery cell to flow through the venting port and ultimately be discharged via the explosion-proof valve. A bracket surrounds and forms the venting port, and the bracket's position around the venting port also provides protection for it.

[0008] As a further improvement, each of the brackets includes a first bracket and a second bracket connected together; the first exhaust channel is located between adjacent first brackets, and the second bracket is located around the exhaust port.

[0009] As a further improvement, the side of the second bracket near the exhaust port is an arc shape that matches the shape of the exhaust port.

[0010] As a further improvement, the width of the first exhaust channel is 20%-80% of the width of the side of the housing it is located in. This satisfies the venting requirements of the first exhaust channel while providing support for the battery cell.

[0011] As a further improvement, the thickness of the bracket is 1-2.5mm. This satisfies the venting requirements of the first venting channel while minimizing the impact of the bracket on the battery volume.

[0012] As a further improvement, an insulating film is also included, which covers the outside of the battery cell.

[0013] As a further improvement, the bracket is positioned on the outside of the insulating film. The insulating film insulates the bracket and the battery cell, preventing short circuits.

[0014] As a further improvement, several second exhaust channels are also provided at intervals on the bottom side of the insulating film.

[0015] As a further improvement, the second exhaust passage is located on the first exhaust passage.

[0016] As a further improvement, the second exhaust passage is located at a position corresponding to the exhaust port. The second exhaust passage, in conjunction with the first exhaust passage, discharges gases located at different positions inside the housing.

[0017] Other technical problems that the lithium battery structure of this utility model can solve, other technical features contained in the technical solution, and the advantages brought by these technical features will be further explained in detail with reference to the accompanying drawings. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the shell structure;

[0019] Figure 2 for Figure 1 Enlarged schematic diagram of the bottom of the middle shell;

[0020] Figure 3 This is a schematic diagram of the bracket and insulating film structure.

[0021] Label Explanation:

[0022] 1. Housing; 2. Bracket; 21. First bracket; 22. Second bracket; 3. Vent; 4. First vent channel; 5. Second vent channel; 6. Insulating film. Detailed Implementation

[0023] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings and embodiments.

[0024] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0025] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate for the embodiments of this application described herein.

[0026] This embodiment provides a lithium battery structure, including a cell and a casing 1.

[0027] like Figure 1 As shown, the housing 1 has openings at both ends and is hollow inside. The bottom of the housing 1 has an explosion-proof valve hole, and the battery cell is installed inside the housing 1. In one application, this lithium battery structure is used in a vehicle, where the direction of gravity acting on the lithium battery structure is towards the bottom of the housing 1. In this design, the explosion-proof valve hole is located at the bottom of the housing 1. In the event of thermal runaway, the high-temperature gas inside the battery rushes out through the explosion-proof valve hole in a direction away from passengers, providing them with time to escape and improving safety.

[0028] Specifically, the two ends of the battery cell are connected to terminals, which are located on the open sides of the two ends of the housing 1. In order to allow gas to be discharged through the explosion-proof valve port in the event of thermal runaway of the battery cell, a gas flow channel to the explosion-proof valve port needs to be left at the bottom of the housing 1.

[0029] Combination Figure 2 and Figure 3 As shown, an even number of brackets 2 are provided on the bottom side of the housing 1 near the battery cell, and the battery cell is supported on the brackets 2. The brackets 2 are spaced apart and together form an exhaust port 3 corresponding to the position of the explosion-proof valve and explosion-proof valve hole of the battery cell. At the same time, adjacent brackets 2 are symmetrically arranged along the center of the exhaust port 3. Along the length direction of the housing 1, a first exhaust channel 4 is also formed between adjacent brackets 2.

[0030] The length direction of housing 1 is the direction in which it extends toward the openings at both ends of housing 1, and the direction perpendicular to the length direction is its width direction.

[0031] Both the explosion-proof valve and the explosion-proof valve orifice are located at the bottom of the battery cell. The position of the vent hole 3 corresponds to that of the explosion-proof valve orifice, and the centers of the vent hole 3 and the explosion-proof valve orifice coincide. When projected towards the bottom, the projections of the vent hole 3 and the explosion-proof valve orifice coincide, or the projection surface of the vent hole 3 covers the projection surface of the explosion-proof valve orifice.

[0032] In this design, the battery cell is supported by brackets 2. Particularly along the length of the housing 1, a first venting channel 4 is formed between adjacent brackets 2, allowing internal gas to flow through the first venting channel 4 to the venting port 3, and finally discharged through the explosion-proof valve port. Furthermore, an even number of brackets 2 are used, preferably four, with adjacent brackets 2 symmetrically arranged along the center of the venting port 3. This ensures the brackets 2 support the battery cell from four directions at its bottom, resulting in even force distribution and preventing skewing that could block the venting channel. Moreover, the brackets 2 enclose the venting port 3, providing protection and preventing the venting port 3 from affecting the battery cell structure, or vice versa. Finally, each bracket 2 extends continuously from one end near the venting port 3 to the side near the housing 1. Each continuously arranged bracket 2 increases the contact area with the battery cell, improving support and preventing blockage of the venting channel when the battery cell expands.

[0033] See Figure 3 As shown, each bracket 2 includes a first bracket 21 and a second bracket 22 connected together. A first exhaust channel 4 is located between adjacent first brackets 21, and the second bracket 22 is located around the exhaust hole 3. Furthermore, the side of the second bracket 22 closest to the exhaust hole 3 is arc-shaped, matching the shape of the exhaust hole 3. The arrangement of the brackets 2 forms a connected first exhaust channel 4 and exhaust hole 3, resulting in a simple and convenient structure.

[0034] As a further improvement, the width of the first exhaust channel 4 is 20%-80% of the width of the side of the housing 1 it is located in. This satisfies the venting requirements of the first exhaust channel 4 while providing support for the battery cell.

[0035] In addition, the thickness of bracket 2 is 1-2.5mm. This is to meet the venting requirements of the first venting channel 4 while minimizing the impact of bracket 2 on the battery volume.

[0036] The lithium battery structure described in this embodiment also includes an insulating film 6, which covers the outer side of the contact surface between the battery cell and the casing 1. A bracket 2 is disposed on the outer side of the insulating film 6. The bracket 2 is made of aluminum, and the insulating film 6 insulates the bracket 2 and the battery cell from each other, preventing short circuits.

[0037] As a further improvement, several second exhaust channels 5 are also spaced apart on the bottom side of the insulating film 6. Some of the second exhaust channels 5 are located at positions corresponding to the first exhaust channels 4. Some of the second exhaust channels 5 are located at positions corresponding to the exhaust holes 3. The combination of the second exhaust channels 5 and the first exhaust channels 4 allows gas located in different positions inside the casing to be discharged, improving battery safety. When thermal runaway occurs in the battery cell, gas carrying high heat fills different parts of the casing, and the gas inside the insulating film at the bottom of the battery cell can be discharged in time through the second exhaust channels 5.

[0038] Regarding the installation of bracket 2, it can first be fixedly connected to bracket 2 using PP hot melt adhesive strips, and then connected to insulating film 6 using hot melt PP adhesive strips. Avoid using glue or tape bonding methods, as the electrolyte will react chemically with the glue, affecting the installation stability of bracket 2.

[0039] The terms "installation," "setup," "equipped with," and "connection" used herein should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0040] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A lithium battery structure, characterized in that, include: Battery cell; The housing (1) is hollow inside and is used to accommodate the battery cell. An even number of brackets (2) are provided on the bottom side of the housing (1) near the battery cell, and the battery cell is supported on the brackets (2). The brackets (2) are spaced apart and form an exhaust hole (3) corresponding to the position of the explosion-proof valve of the battery cell. Adjacent brackets (2) are symmetrically arranged along the center of the exhaust hole (3). Along the length direction of the housing (1), a first exhaust channel (4) communicating with the exhaust hole (3) is also formed between adjacent brackets (2).

2. The lithium battery structure according to claim 1, characterized in that: Each of the brackets (2) includes a first bracket (21) and a second bracket (22) connected together; the first exhaust channel (4) is located between adjacent first brackets (21), and the second bracket (22) is located around the exhaust port (3).

3. The lithium battery structure according to claim 2, characterized in that: The second bracket (22) is arc-shaped on the side near the exhaust hole (3) to match the shape of the exhaust hole (3).

4. The lithium battery structure according to claim 2, characterized in that: The width of the first exhaust channel (4) is 20%-80% of the width of the side of the housing (1) in which it is located.

5. The lithium battery structure according to claim 2, characterized in that: The thickness of the bracket (2) is 1-2.5 mm.

6. The lithium battery structure according to any one of claims 1-5, characterized in that: It also includes an insulating film (6) that covers the outside of the battery cell.

7. The lithium battery structure according to claim 6, characterized in that: The bracket (2) is disposed on the outside of the insulating film (6).

8. The lithium battery structure according to claim 7, characterized in that: Several second exhaust channels (5) are also provided at intervals on the bottom side of the insulating film (6).

9. The lithium battery structure according to claim 8, characterized in that: The second exhaust passage (5) is located on the first exhaust passage (4).

10. The lithium battery structure according to claim 8, characterized in that: The second exhaust passage (5) is located at the position corresponding to the exhaust port (3).

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