A battery stand

Abstract

The utility model discloses a battery bottom support, including battery bottom support body, set up on the battery bottom support body's exhaust hole and set up on the battery bottom support body's a plurality of bosses, the exhaust hole is used for discharging the gas of battery inside generation, the boss is used for placing the core of stacking, the boss top surface protrudes at the battery bottom support body bottom surface, when the core of stacking is placed in the boss top surface, and the clearance is formed between the core of stacking bottom surface and the battery bottom support body bottom surface, so that the core of stacking bottom surface is deformed and blocks the exhaust hole and influences the outward exhaust during the battery thermal runaway test process.

Description

Technical Field

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

[0002] With the popularization of electric vehicles and the continuous development of power battery technology, the safety of battery systems has become a focus of attention; thermal runaway, as a serious safety hazard in battery systems, makes its testing and evaluation particularly important.

[0003] Thermal runaway refers to the phenomenon where the internal temperature of a battery rises uncontrollably under specific conditions, which may lead to battery fire or explosion. The main causes of thermal runaway include internal short circuits, external heating, and overcharging. Thermal runaway testing is a method for testing battery safety, mainly used to evaluate the thermal stability of batteries under extreme conditions.

[0004] Currently, during thermal runaway tests of batteries, the problem of poor internal venting is quite prominent, as high temperatures may cause plastic parts to deform or melt, thus blocking the venting channels. Measures urgently need to be taken to solve this problem. Utility Model Content

[0005] Technical problem to be solved by the utility model In view of this, the purpose of this utility model is to provide a battery base support. By constructing several integrally stamped protrusions on the battery base support body, a gap is formed between the stacked core and the bottom surface of the battery base support body, which solves the problem that the deformation of the bottom surface of the stacked core during the battery thermal runaway test may block the vent hole and thus affect the smooth outward exhaust.

[0006] Technical solution and its beneficial effects To achieve the above objectives, this utility model provides the following technical solution: The present invention provides a battery base, including a battery base body, an exhaust hole disposed on the battery base body, and a plurality of protrusions disposed on the battery base body. The vent is used to release the gas generated inside the battery. The boss is used to place the stack core. The top surface of the boss protrudes from the bottom surface of the battery base body. When the stack core is placed on the top surface of the boss, a gap is formed between the bottom surface of the stack core and the bottom surface of the battery base body to prevent the bottom surface of the stack core from deforming and blocking the vent hole during the battery thermal runaway test, thus affecting the outward venting.

[0007] Furthermore, the bosses are integrally stamped with the battery base body, and the bosses are arranged in pairs and symmetrically about the center line of the length direction of the battery base body. This integral stamping structure of the bosses and battery base body enables the battery base to have better mechanical properties, and the symmetrical arrangement of the bosses also helps to achieve stable support for the stacked cores.

[0008] Furthermore, the protrusions are configured in pairs, and the battery base body has a hollow structure in the middle, which further improves the gas discharge effect.

[0009] Furthermore, the protrusions are configured in 6 pairs, and the battery base body has a double row of exhaust holes evenly constructed in the middle. The diameter of the double row of exhaust holes is the same, and the construction of the double row of exhaust holes makes the gas discharge more even.

[0010] Furthermore, several protrusions are constructed between the double-row exhaust holes, which helps to better support the bottom of the stacked core and prevent the middle part of the stacked core from collapsing and deforming over a long period of time.

[0011] Furthermore, the battery base is made of a substrate and a composite coating sprayed onto the substrate; The substrate is made of 3003 aluminum plate; The composite coating is formed by spraying a mixture of PI (polyimide) resin and thermally conductive filler onto the substrate. This avoids the problem of poor ventilation in the vent holes and effectively mitigates the insulation risks inside the battery.

[0012] Furthermore, the thermally conductive filler is at least one of BN (boron nitride), alumina, or silicon carbide, and the content of the thermally conductive filler is 10-30 wt%. In this case, the composite coating formed by spraying the PI resin and the thermally conductive filler has better thermoplasticity and thermosetting properties.

[0013] Furthermore, the aluminum substrate surface is sandblasted to remove dirt and oxides, enhance the adhesion between the substrate and the coating, and allow the coating to be better embedded in the substrate; the surface roughness Ra is 3-5μm, and its wear resistance, stability and corrosion resistance can all achieve good results.

[0014] Furthermore, the thermally conductive filler is BN. Mixing PI resin with BN particles and applying it using an electrostatic spraying process can effectively improve the utilization rate of the coating and reduce pollutant emissions.

[0015] Furthermore, the battery base body is designed with sloping slides at both ends, which makes it easier to weld to the aluminum shell and facilitates the stacking of the core into the shell.

[0016] In addition to the purposes, features, and effects described above, this utility model has other purposes, features, and effects. The present utility model will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the battery base with a hollowed-out center between two pairs of protrusions according to this utility model. Figure 2 This is a schematic diagram of the battery base with six pairs of protrusions and double-row exhaust holes in the middle according to this utility model; Figure 3 This is a schematic diagram of a battery base with protrusions on both the edges and the middle of the present invention. Figure 4 This is a simplified flowchart of the aluminum base coating process of this utility model.

[0018] The following are the labels in the diagram: 1. Battery base body, 2. Boss, 3. Vent hole. Detailed Implementation

[0019] To enable those skilled in the art to better understand this technical solution, the technical solution of this utility model will be clearly and completely described below in conjunction with the accompanying drawings and embodiments.

[0020] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and are not intended to limit the scope of this invention. Therefore, they 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 this invention, should still fall within the scope of the disclosed technical content. Furthermore, terms such as "length," "width," "beginning," "end," "top," "bottom," and "edge," as 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 this invention.

[0021] During thermal runaway tests, high temperatures can cause plastic parts to deform or melt, leading to blockage of the venting channels and hindering the smooth venting of the battery. The basic idea of ​​this invention is to construct several protrusions on the battery base body 1, creating a gap between the stacked core and the bottom surface of the battery base body 1. This avoids the problem that deformation of the bottom surface of the stacked core may block the venting holes and affect the smooth venting of the battery.

[0022] refer to Figures 1 to 4 As shown, a battery base according to an embodiment of the present utility model includes a battery base body 1, an exhaust hole 3 disposed on the battery base body 1, and a plurality of protrusions 2 disposed on the battery base body 1. The vent 3 is used to discharge the gas generated inside the battery. The protrusion 2 is used to place the stacked core. The top surface of the protrusion 2 protrudes beyond the bottom surface of the battery base body 1. When the stacked core is placed on the top surface of the protrusion 2, a gap is formed between the bottom surface of the stacked core and the bottom surface of the battery base body 1 to prevent the bottom surface of the stacked core from deforming and blocking the vent hole 3 during the battery thermal runaway test, thus affecting the outward venting. The height of the protrusion 2 is between 0.5-3.0mm and can be appropriately selected according to actual working needs. The shape of the protrusion 2 can be a cuboid, cube, cylinder, or frustum, which can be selected according to specific application scenarios and actual working needs, and is not limited here.

[0023] The boss 2 is integrally stamped with the battery base body 1. The bosses 2 are arranged in pairs and are symmetrical about the center line of the length direction of the battery base body 1. The integral stamping of the bosses 2 and the battery base body 1 enables the battery base to have better mechanical properties, and the symmetrical arrangement of the bosses 2 is also conducive to achieving stable support for the stacked cores.

[0024] The protrusions 1 are configured in pairs, and the battery base body 1 has a hollow structure in the middle, which can further improve the gas discharge effect.

[0025] In some embodiments, the bosses 1 can be configured as 6 pairs, and the battery base body 1 has a double row of vent holes 3 evenly constructed in the middle. The double row of vent holes 3 has the same diameter, and this construction of the double row of vent holes 3 makes the gas discharge more even. Four pairs of bosses can also be provided, or a single row of vent holes can also be provided, etc., as long as the actual needs are met.

[0026] Several protrusions 2 are also constructed between the double-row exhaust holes 3, which helps to better support the bottom of the stacked core and prevent the middle part of the stacked core from collapsing and deforming over a long period of time.

[0027] The battery base is made of a substrate and a composite coating sprayed onto the substrate; The substrate is made of 3003 aluminum plate, which has a melting point of 575°C and a low coefficient of thermal expansion. 3003 aluminum plate is not easily melted or deformed at high temperatures. The composite coating is formed by spraying a mixture of PI (polyimide) resin and thermally conductive filler. By spraying a composite coating made of PI resin and thermally conductive filler onto the substrate, the problem of poor ventilation of the vent hole 3 can be avoided, and the insulation risk inside the battery can also be effectively solved.

[0028] Polypropylene (PI) is a high-performance specialty engineering plastic that combines thermoplastic and thermosetting properties, exhibiting excellent heat resistance, mechanical strength, chemical stability, and insulation performance. PI maintains long-term stability in high-temperature environments above 300°C. When sprayed onto the surface of an aluminum base, it significantly enhances the aluminum's resistance to high-temperature operating environments. For example, when used in high-temperature components of electronic devices, it effectively prevents the aluminum substrate from failing due to thermal expansion or oxidation. PI material exhibits high stability against acids, alkalis, and other chemicals. After spraying, it provides a chemical protective layer for the aluminum base, reducing the erosion of the aluminum substrate by corrosive media and extending the service life of the aluminum material. PI material also possesses high mechanical strength and toughness, improving the wear resistance and impact resistance of the aluminum base after spraying.

[0029] The thermally conductive filler is at least one of BN (boron nitride), alumina, or silicon carbide, and the content of the thermally conductive filler is 10-30 wt%.

[0030] Thermally conductive fillers can improve the thermal conductivity of materials, facilitating heat transfer. By spraying a coating containing thermally conductive materials onto a substrate, heat conduction paths can be formed, thereby increasing the overall thermal conductivity of the material and enabling rapid and uniform heat transfer, preventing localized overheating. Boron nitride (BN), alumina, or silicon carbide are all high-performance thermally conductive fillers. One or more of these can be used, or other thermally conductive fillers can be selected according to the specific needs of the application.

[0031] The content of the thermally conductive filler is 10-30 wt%. When the content of the thermally conductive filler is low, it is difficult for the fillers to form an effective thermally conductive network structure, resulting in poor thermal conductivity. As the filler content increases, the thermal conductivity also increases; however, when the filler content increases to a certain proportion, the improvement in thermal conductivity is not significant. A content of 10-30 wt% of the thermally conductive filler is sufficient to meet the operational requirements, with 20 wt% being preferred.

[0032] The aluminum substrate surface is sandblasted to remove dirt and oxides, enhance the adhesion between the substrate and the coating, and allow the coating to be better embedded in the substrate; the surface roughness Ra is 3-5μm, under which the wear resistance, stability and corrosion resistance are all achieved, preferably Ra 4μm.

[0033] The thermally conductive filler is BN. PI resin and BN particles are mixed and sprayed using an electrostatic spraying process. After curing, the PI powder does not release harmful substances, which can improve the utilization rate of the coating, reduce pollutant emissions, and meet the environmental protection requirements of modern industry.

[0034] The spraying sequence is roughly as follows: the surface of the battery base is cleaned to remove oil, foreign matter, etc.; then, the surface is treated by plasma cleaning, or by alkaline degreasing → water washing → acid etching (nitric acid / hydrofluoric acid mixture) → sandblasting; PI resin is mixed with BN particles (particle size 1-5μm), and electrostatic spraying is performed at a voltage of 50-80kV; curing is carried out in two stages, the first stage is pre-curing at 120℃ for 30min, and the second stage is curing at 250-300℃, preferably 280℃, for 2h.

[0035] The battery base body 1 is designed with a sloping slide shape at both ends, which facilitates welding with the aluminum shell and helps to stack the core into the shell.

[0036] In some embodiments: a 3003 aluminum plate is specifically used, and after surface grinding, sandblasting and other treatments, it is then cleaned with a hydrocarbon aqueous solution and water washing to remove oil and other contaminants from the surface of the aluminum base. Then, surface plasma cleaning is performed to increase the surface performance of the battery base and facilitate the application of PI adhesive. Preparation of PI spraying solution: PI resin (solid content 40%) and BN filler (20wt%) are ball-milled and mixed for 2 hours; Electrostatic spraying (voltage 60kV), wet film thickness 100-150μm; Step curing: 120℃ / 30min + 280℃ / 2h.

[0037] Test data - Resistance to thermal shock (-40℃~250℃ 50 cycles): No cracking; - Insulation withstand voltage: >5kV / mm (IEC 60243).

[0038] 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. If any person skilled in the art, inspired by this description, designs a similar structure to the present invention without departing from its inventive spirit, such design shall fall within the protection scope of the present invention.

Claims

1. A battery tray, characterized by, It includes a battery base body (1), an exhaust hole (3) provided on the battery base body (1), and several protrusions (2) provided on the battery base body (1). The vent (3) is used to discharge the gas generated inside the battery; The boss (2) is used to place the stack core. The top surface of the boss (2) protrudes from the bottom surface of the battery base body (1). When the stack core is placed on the top surface of the boss (2), a gap is formed between the bottom surface of the stack core and the bottom surface of the battery base body (1) to prevent the bottom surface of the stack core from deforming and blocking the exhaust hole (3) during the battery thermal runaway test, thus affecting the outward exhaust.

2. The battery tray of claim 1, wherein, The boss (2) is integrally stamped with the battery base body (1). The bosses (2) are arranged in pairs and are symmetrical about the center line of the length direction of the battery base body (1).

3. The battery tray of claim 2, wherein, The boss (2) is set in two pairs, and the battery base body (1) has a hollow structure in the middle.

4. The battery tray of claim 2, wherein, The boss (2) is set in 6 pairs, and the battery base body (1) is uniformly constructed with double rows of exhaust holes (3) in the middle, and the diameter of the double rows of exhaust holes (3) is the same.

5. The battery tray of claim 4, wherein, Several bosses (2) are also constructed between the double-row exhaust holes (3).

6. The battery tray of any one of claims 1 to 5, wherein, The battery base is made of a substrate and a composite coating sprayed onto the substrate; The substrate is made of 3003 aluminum plate; The composite coating is formed by spraying a mixture of polyimide resin and thermally conductive filler.

7. The battery tray of claim 6, wherein, The surface of the substrate is sandblasted, with a surface roughness Ra of 3-5 μm.

8. The battery tray of claim 7, wherein, The thermally conductive filler is BN, which is mixed with PI resin and BN particles and then sprayed using an electrostatic spraying process.

9. The battery tray of claim 1, wherein, The battery base is designed in a slide-like shape with ramps at both ends.

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