Lithium battery structure
By fixing a bracket to the outside of the lithium battery casing and setting up an exhaust channel, the problem of the fixed support affecting the internal environment of the battery is solved, achieving efficient heat dissipation and improved safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HEFEI GUOXUAN HIGH TECH POWER ENERGY
- Filing Date
- 2025-04-27
- Publication Date
- 2026-04-28
AI Technical Summary
Existing lithium battery support fixing methods can easily affect the internal environment of the battery and are difficult to dissipate heat effectively in high power density applications. Traditional welding methods may lead to slag spillage or sealing problems.
A bracket is fixed to the outside of the lithium battery casing. The bracket and the casing are connected by welding to the outside of the casing to prevent welding slag from entering the battery. An exhaust channel is set on the bracket to facilitate the discharge of high-temperature gas.
This improves the fixation effect of the support components, avoids welding impurities from contaminating the inside of the battery, and ensures effective heat dissipation and safety.
Smart Images
Figure CN224177513U_ABST
Abstract
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.
[0004] To improve thermal runaway safety, some batteries have explosion-proof valves located at the bottom, directing high-temperature, high-heat gases towards non-passenger areas. However, to prevent cell blockage of the explosion-proof valve, this method requires support components to form an exhaust channel and support the cells. In this case, the installation and fixation of these support components still present some challenges. Existing methods, such as adhesive bonding, can fix the support components to the battery casing or the cell's insulating film, but the electrolyte easily attracts the adhesive, affecting the fixation effect. Support components are often installed inside the casing; if fixed to the casing by welding, protruding weld points can affect the casing's seal, and weld slag can easily spill into the casing, affecting the battery's internal environment. Utility Model Content
[0005] This invention provides a lithium battery structure to solve the problem of fixing the support component, improve the fixing effect of the support component, and avoid the fixing of the support component affecting the internal environment of the battery.
[0006] To achieve the above objectives, the technical solution provided by this utility model is as follows:
[0007] A lithium battery structure, comprising,
[0008] Battery cell;
[0009] A housing for accommodating the battery cell; the bottom of the housing is the bottom side of the housing, and an explosion-proof valve hole is provided on the bottom side of the housing; a bracket is provided on the side of the bottom side of the housing near the battery cell, and an exhaust channel communicating with the explosion-proof valve hole is also provided on the bracket;
[0010] A bracket connecting part protrudes from one side of the bracket. The bracket connecting part passes through the side of the housing and protrudes from the outside of the housing, so that the housing and the bracket can be fixedly connected from the outside of the housing.
[0011] In this design, the housing and bracket are fixedly connected from the outside of the housing. This makes it more convenient to operate outside the housing, easier to control the welding quality, and improves the fixing effect between the two. On the other hand, it avoids the contamination of the battery by impurities generated during the operation.
[0012] In a preferred embodiment, the bracket connection is located on the side of the bracket closest to the bottom side of the housing, and the bracket connection protrudes along the thickness direction of the bracket. This reduces the impact of the bracket connection and the bracket on the internal space of the battery.
[0013] In a preferred embodiment, the bracket connecting parts are an even number and are symmetrically arranged along the centerline of the bracket's length and width. This makes the force on the bracket more even, avoids skewing, and also facilitates the positioning of the bracket.
[0014] In a preferred embodiment, a housing connection position is provided on the bottom side of the housing at a position corresponding to the bracket connection portion, and the bracket connection portion is located in the housing connection position.
[0015] In a preferred embodiment, the housing connection position is a through hole that penetrates the bottom side of the housing.
[0016] In a preferred embodiment, the bracket connecting part is cylindrical, and the diameter of the bracket connecting part is greater than or equal to the thickness of the bottom side of the housing. This avoids the bracket connecting part having an excessively small diameter, which would concentrate the welding in one place, leading to excessive heat and potentially causing burn-through.
[0017] In a preferred embodiment, a countersunk hole is provided at one end of the housing connection near the outer side of the housing.
[0018] In a preferred embodiment, the end of the bracket connection portion located in the housing connection position does not extend beyond the countersunk hole. The countersunk hole allows the weld points of the welded connections to be accommodated within it, preventing the weld points from extending beyond the outer side of the bottom side of the housing and thus avoiding excessive space occupied by the battery.
[0019] In a preferred embodiment, the bracket connecting part is welded to the bottom side of the housing on the outside of the housing.
[0020] In a preferred embodiment, a support portion is provided on the bracket at a position corresponding to the explosion-proof valve hole. This serves two purposes: firstly, it prevents the support portion from blocking or excessively covering the explosion-proof valve hole; secondly, when the battery cell experiences thermal runaway expansion, the support portion rests on the battery cell, preventing the expanded battery cell from blocking the explosion-proof valve hole.
[0021] 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
[0022] Figure 1 This is a schematic diagram of a lithium battery casing structure;
[0023] Figure 2 This is a schematic diagram of the lithium battery casing structure from another angle;
[0024] Figure 3 This is a schematic diagram of the bracket structure;
[0025] Figure 4 This is an enlarged schematic diagram of the bottom side of the shell.
[0026] Figure 5 for Figure 4 Schematic diagram of the AA section;
[0027] Figure 6 for Figure 5 Enlarged structural diagram at point B.
[0028] Label Explanation:
[0029] 1. Housing; 11. Bottom side of housing; 111. Housing connection position; 112. Countersunk hole; 12. Explosion-proof valve hole;
[0030] 2. Bracket; 21. Bracket connecting part; 22. Support part; 23. Exhaust channel. Detailed Implementation
[0031] 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.
[0032] The structures, proportions, and sizes illustrated in the accompanying drawings are solely 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.
[0033] This embodiment provides a lithium battery structure, including a cell and a casing 1.
[0034] like Figure 1 and Figure 2 As shown, the housing 1 has openings at both ends and is hollow inside. The bottom of the housing 1 is the bottom side 11, and an explosion-proof valve hole 12 is opened on the bottom side 11. The battery cell is installed inside the housing 1. In one case, this lithium battery structure is applied to a car, and the direction of gravity on the lithium battery structure is the bottom of the housing 1. In this solution, the explosion-proof valve hole 12 is opened 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 12 in the direction of non-passengers, providing passengers with time to escape and improving safety.
[0035] Additionally, a bracket 2 is provided on the side of the bottom surface 11 of the housing near the battery cell. The bracket 2 also has an exhaust channel 23 communicating with the explosion-proof valve port 12. In this design, the battery cell is connected to terminals at both ends, which are located on the open sides of both ends of the housing 1. The battery cell is installed inside the housing 1 and supported on the bracket 2. To ensure that gas can be discharged through the explosion-proof valve port 12 in the event of thermal runaway of the battery cell, an exhaust channel 23 communicating with the explosion-proof valve port 12 is provided on the bracket 2, allowing the gas to escape.
[0036] like Figure 3 As shown, a support portion 22 is provided on the bracket 2 at a position corresponding to the explosion-proof valve hole 12. The support portion 22 consists of two cross-arranged support rods. On the one hand, it prevents the support portion 22 from blocking or covering too much of the explosion-proof valve hole 12; on the other hand, when the battery cell undergoes thermal runaway expansion, the support portion 22 supports the battery cell, preventing the expanded battery cell from blocking the explosion-proof valve hole 12.
[0037] Preferably, a bracket connecting part 21 protrudes from one side of the bracket 2. The bracket connecting part 21 passes through the side of the housing 1 and protrudes from the outside of the housing 1, so that the housing 1 and the bracket 2 can be fixedly connected from the outside of the housing 1.
[0038] It should be noted that the bracket connection part 21 is exposed from the outside of the housing 1, so that the bracket connection part 21 can be visually seen from the outside of the housing.
[0039] In this design, the bracket connecting part 21 protrudes from the outside of the housing 1, allowing for a fixed connection between the housing 1 and the bracket 2 from the outside. For example, the bracket 2 can be fixedly connected to the housing 1 by welding between the bracket connecting part 21 and the bottom side 11 of the housing. Compared to the existing method of welding the bracket 2 inside the housing 1, the weld protrusion formed by spot welding can easily hinder the sealing of the housing, and the welding slag and other substances formed during welding can easily fall into the inside of the housing, affecting the internal environment of the battery.
[0040] In this solution, the housing 1 and the bracket 2 are fixedly connected from the outside of the housing 1. On the one hand, it is more convenient to operate outside the housing and easier to control the welding quality, thus improving the fixing effect between the two. On the other hand, it avoids the contamination of the battery by impurities generated during the operation.
[0041] Combination Figure 3 and Figure 4 As shown, firstly Figure 4 The thickness direction of the bracket 2 is defined as the direction closer to or further away from the battery cell, and the thickness of the bracket 2 is less than its width and length. The bracket connecting portion 21 is located on the side of the bracket 2 closest to the bottom side surface 11 of the housing, and protrudes along the thickness direction of the bracket 2. When the bracket connecting portion 21 passes through the side surface of the housing 1, the bracket 2 is tightly pressed against the inner side of the bottom side surface 11 of the housing. The bracket connecting portion 21 protruding along the thickness direction of the bracket 2 avoids occupying internal space within the battery housing and reduces the impact of the bracket 2 on the internal space of the battery.
[0042] As a further improvement, the bracket connecting parts 21 are an even number and symmetrically arranged along the centerline of the length direction and the centerline of the width direction of the bracket 2. In one specific embodiment, there are two bracket connecting parts 21, located at opposite ends of the bracket 2, symmetrically arranged along the centerline of the length direction and symmetrically arranged along the centerline of the width direction of the bracket 2. In other cases, the number of bracket connecting parts 21 can also be different, for example, four bracket connecting parts 21, located at opposite ends of the bracket 2, symmetrically arranged along the centerline of the length direction and symmetrically arranged along the centerline of the width direction of the bracket 2. This arrangement of the bracket connecting parts 21 makes the force on the bracket 2 more even, avoids skewing, and facilitates the positioning of the bracket 2.
[0043] Combination Figure 2 , Figure 4 and Figure 5As shown, a housing connection position 111 is provided on the bottom side surface 11 of the housing, corresponding to the bracket connection portion 21, and the bracket connection portion 21 is located in the housing connection position 111. Specifically, the housing connection position 111 is a through hole penetrating the bottom side surface 11 of the housing. In addition, the bracket connection portion 21 is cylindrical, and the diameter of the bracket connection portion 21 is greater than or equal to the thickness of the bottom side surface 11 of the housing. First, for example, the housing connection position 111 is a circular or arc-shaped through hole penetrating the bottom side surface 11 of the housing, to avoid the formation of stress concentration points on the bottom side surface 11 of the housing due to the setting of the housing connection position 111, which would affect the service life of the housing and cause the housing to crack in the event of thermal runaway of the battery cell. Second, the diameter of the bracket connection portion 21 is greater than or equal to the thickness of the bottom side surface 11 of the housing to avoid heat concentration during welding, which would cause the housing to be welded through. If the diameter of the bracket connection portion 21 is too small, welding will be concentrated in one place, and the heat will be too concentrated, which will easily lead to weld through.
[0044] See Figure 6 As shown, a countersunk hole 112 is provided at one end of the housing connection position 111 near the outer side of the housing 1. The end of the bracket connection portion 21 located in the housing connection position 111 does not extend beyond the countersunk hole 112, that is, the end of the bracket connection portion 21 located in the housing connection position 111 does not extend beyond the outer side of the bottom side surface 11 of the housing. The bracket connection portion 21 and the bottom side surface 11 of the housing are welded together on the outer side of the housing 1. The countersunk hole 112 allows the protruding weld points to be accommodated within it, preventing the weld points from extending beyond the outer side of the bottom side surface 11 of the housing and thus avoiding excessive space occupied by the battery.
[0045] In this design, the connecting bracket 2 and the housing 1 are welded to the outside of the housing to prevent welding slag and other substances formed during welding from falling into the housing and affecting the internal environment of the battery.
[0046] 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; A housing (1) is used to accommodate the battery cell; the bottom of the housing (1) is a housing bottom side (11), and an explosion-proof valve hole (12) is opened on the housing bottom side (11); a bracket (2) is provided on the side of the housing bottom side (11) near the battery cell, and an exhaust channel (23) communicating with the explosion-proof valve hole (12) is also opened on the bracket (2); A bracket connecting part (21) protrudes from one side of the bracket (2). The bracket connecting part (21) passes through the side of the housing (1) and protrudes from the outside of the housing (1), so that the housing (1) and the bracket (2) can be fixedly connected from the outside of the housing (1).
2. The lithium battery structure according to claim 1, characterized in that: The bracket connection part (21) is located on the side of the bracket (2) near the bottom side (11) of the housing, and the bracket connection part (21) protrudes along the thickness direction of the bracket (2).
3. The lithium battery structure according to claim 2, characterized in that: The bracket connecting part (21) has an even number and is symmetrically arranged along the centerline of the length direction and the centerline of the width direction of the bracket (2).
4. The lithium battery structure according to any one of claims 1-3, characterized in that: A housing connection position (111) is provided on the bottom side (11) of the housing, corresponding to the bracket connection part (21), and the bracket connection part (21) is located in the housing connection position (111).
5. The lithium battery structure according to claim 4, characterized in that: The housing connection position (111) is a through hole that penetrates the bottom side (11) of the housing.
6. The lithium battery structure according to claim 4, characterized in that: The bracket connection part (21) is cylindrical, and the diameter of the bracket connection part (21) is greater than or equal to the thickness of the bottom side surface (11) of the housing.
7. The lithium battery structure according to claim 5, characterized in that: A countersunk hole (112) is provided at one end of the housing connection position (111) near the outside of the housing (1).
8. The lithium battery structure according to claim 7, characterized in that: The bracket connection part (21) located at one end of the housing connection position (111) does not extend beyond the countersunk hole (112).
9. The lithium battery structure according to claim 8, characterized in that: The bracket connecting part (21) is welded to the bottom side (11) of the housing on the outside of the housing (1).
10. The lithium battery structure according to claim 1, characterized in that: A support part (22) is provided on the bracket (2) at a position corresponding to the explosion-proof valve hole (12).