High-temperature-resistant composite bottom supporting sheet and battery thereof

Abstract

The utility model discloses a high temperature resistant composite cork base sheet and its battery relates to battery technical field, including the composite cork base sheet, the composite cork base sheet also includes cork base piece and polymer coating, the polymer coating is coated on the cork base piece surface, and the polymer coating and cork base piece are coated into one piece, and the polymer coating is coated on the cork base piece surface of the cork base piece surface of the cork base piece surface of the cork base piece surface of the cork base piece surface of the cork base piece surface of the cork base piece. Arc-shaped chamfers are arranged at four corners of the composite bottom supporting sheet, and the surface of the bottom supporting sheet is coated with the insulating polymer coating by adopting the form of the composite bottom supporting sheet, so that the insulating effect can be achieved, and the effects of ventilation and flow guide can also be achieved; the non-melting state can be maintained even under extreme conditions, or the structural integrity within effective time can be maintained under the condition of high-temperature combustion of the battery, so that the risk of lap joint short circuit between the battery cell and the battery shell is reduced, and a polymer coating on the surface and electrolyte have good wettability; the infiltration efficiency of the battery in the assembly and charge-discharge use process can also be ensured, and the performance of the battery cell is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a high-temperature resistant composite base plate and its battery. Background Technology

[0002] A battery is a device that can convert energy in the form of chemical energy, light energy, heat energy, etc. into electrical energy. It converts other forms of energy into electrical energy through chemical reactions or physical effects. Its basic structure consists of a positive electrode, a negative electrode, an electrolyte, and a separator. The bottom plate, as part of the main structural component of the battery cell, is integrated inside the battery cell and is located between the battery cell and the battery casing. It mainly plays the role of insulation and collision protection.

[0003] In existing battery manufacturing technologies, the base plate is mostly made of rigid PP material or metal plate with insulating sheet. In actual use, a common problem is that under extreme battery conditions, local thermal runaway causes the base plate to melt or deform under extreme high temperature service conditions, which leads to cell short circuit and further heat spread, resulting in the entire battery pack or module going out of control. Utility Model Content

[0004] The purpose of this utility model is to provide a high-temperature resistant composite base plate and its battery, so as to solve the problem mentioned in the background art that the base plate in the existing battery manufacturing technology is mostly made of rigid PP material or metal plate with insulating sheet. In actual use, the problem that often occurs is that under extreme battery conditions, the base plate melts or deforms under extreme high temperature service conditions caused by local thermal runaway, which leads to short circuit of the cell and further heat spread, resulting in the loss of control of the entire battery pack or module.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a high-temperature resistant composite base plate, comprising a composite base plate, wherein the composite base plate further comprises a base plate substrate and a polymer coating, wherein the polymer coating is coated on the surface of the base plate substrate and the polymer coating is integrally coated with the base plate substrate, and the four corners of the composite base plate are provided with rounded chamfers.

[0006] Preferably, the composite base plate is provided with through holes, and there are at least three sets of through holes, which are arranged in a rectangular array on the composite base plate.

[0007] Preferably, a support base is provided below the composite base plate, and three support bases are provided, which are equidistantly arranged below the composite base plate, and the support bases are fixedly connected to the composite base plate.

[0008] Preferably, the lower end of the support base is provided with an opening groove, and there are three opening grooves, which are equidistant from each other at the lower end of the support base, and the cross-section of the opening groove is arc-shaped.

[0009] Preferably, the thickness of the base plate is set to 0.2mm-2mm, and the thickness of the polymer coating is set to 0.1mm-1mm.

[0010] A battery includes a battery casing, a battery cell, and a cover plate, and also includes any of the above-mentioned high-temperature resistant composite base plates. The battery cell is disposed inside the battery casing, the cover plate is disposed above the battery casing, and the composite base plate is embedded between the battery cell and the bottom of the battery casing.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] This utility model device uses a composite base plate, which is located between the bottom of the battery cell and the inner side of the bottom of the battery casing. This composite base plate serves to insulate, guide airflow, and provide cushioning and shock absorption for the battery cell, maintaining sufficient venting space at the bottom of the cell to prevent poor venting. A polymer coating is uniformly applied to the outer surface of the base plate. The base plate can be made of aluminum, rigid PP, PVC, or PET, while the polymer coating can be made of PET resin, polyimide, aramid, acetal, polyurethane, polyester, or polyesterimide. This improves the overall insulation and temperature resistance of the composite base plate, providing good resistance to electrolyte at both room and high temperatures. Under normal battery use and extreme service conditions such as thermal runaway, the composite base plate does not melt or deform, continuing to effectively support the battery cell. This reduces short circuits caused by overlap between the battery casing, the battery cell, and the composite base plate. The polymer coating also has good wettability with the electrolyte, ensuring efficient wetting during battery assembly and charging / discharging, thus improving battery cell performance. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the composite base plate structure of this utility model;

[0014] Figure 2 This is a cross-sectional view of the composite base plate of this utility model;

[0015] Figure 3 This is an exploded view of the battery of this utility model.

[0016] In the diagram: 1. Battery casing; 2. Composite base plate; 3. Battery cell; 4. Cover plate; 5. Through hole; 6. Support base; 7. Opening groove; 8. Base plate substrate; 9. Polymer coating. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0018] Please see Figure 1-3 The present invention provides an embodiment of a high-temperature resistant composite base plate, comprising a composite base plate 2, the composite base plate 2 further comprising a base plate substrate 8 and a polymer coating 9, the polymer coating 9 being coated on the surface of the base plate substrate 8 and integrally coated with the base plate substrate 8, the composite base plate 2 having rounded chamfers at all four corners, the composite base plate 2 having through holes 5, at least three sets of through holes 5 being arranged in a rectangular array on the composite base plate 2, the thickness of the base plate substrate 8 being 0.2mm-2mm, and the thickness of the polymer coating 9 being 0.1mm-1mm.

[0019] The composite base plate 2 is located at the bottom of the battery cell 3, between the bottom of the battery cell 3 and the inner side of the bottom of the battery casing 1. It serves to provide insulation and ventilation, and also to buffer and dampen the battery cell 3. The through hole 5 connects the upper and lower layers of the composite base plate 2, allowing the bottom of the battery cell 3 to maintain a certain amount of ventilation space, preventing safety issues caused by poor ventilation of the battery cell 3. The base plate 8 is made of aluminum sheet, rigid PP material sheet, PVC sheet, or PET sheet. The polymer coating 9 is made of PET resin, polyimide material, aramid material, acetal type, polyurethane type, polyester type, or polyesterimide type. Coating the outer surface of the base plate 8 with the polymer coating 9 improves the overall insulation and temperature resistance of the composite base plate 2. It has good resistance to electrolyte at room temperature and high temperature. Under normal battery use and extreme service conditions such as thermal runaway, the composite base plate 2 does not melt or deform, and can continue to effectively support the battery cell 3, reducing the overlap and short circuit between the battery casing 1, the battery cell 3, and the composite base plate 2.

[0020] Please see Figure 1 A support base 6 is provided below the composite base plate 2. There are three support bases 6, which are equidistantly arranged below the composite base plate 2. The support bases 6 are fixedly connected to the composite base plate 2. An opening groove 7 is provided at the lower end of the support base 6. There are three opening grooves 7, which are equidistantly arranged at the lower end of the support base 6. The cross-section of the opening groove 7 is arc-shaped. The support base 6 directly contacts the bottom of the battery casing 1, separating the composite base plate 2 from the bottom of the battery casing 1. The opening groove 7, together with the support base 6, allows sufficient space to be reserved between the bottom of the composite base plate 2 and the bottom of the battery casing 1 for airflow and ventilation.

[0021] A battery includes a battery casing 1, a battery cell 3, and a cover plate 4, and also includes any of the aforementioned high-temperature resistant composite bottom support plates in the embodiments. The battery cell 3 is disposed inside the battery casing 1, the cover plate 4 is disposed above the battery casing 1, and the composite bottom support plate 2 is embedded and installed between the battery cell 3 and the bottom of the battery casing 1.

[0022] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0023] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-temperature resistant composite base plate, comprising a composite base plate (2), characterized in that: The composite base plate (2) also includes a base plate (8) and a polymer coating (9). The polymer coating (9) is coated on the surface of the base plate (8), and the polymer coating (9) and the base plate (8) are coated as one piece. The four corners of the composite base plate (2) are provided with rounded chamfers. The composite base plate (2) is provided with through holes (5), and there are at least three sets of through holes (5), and the through holes (5) are arranged in a rectangular array on the composite base plate (2); A support base (6) is provided below the composite base plate (2). There are three support bases (6), and the three support bases (6) are equidistantly arranged below the composite base plate (2). The support base (6) is fixedly connected to the composite base plate (2). The lower end of the support base (6) is provided with an opening groove (7), and there are three opening grooves (7), which are equidistant from each other at the lower end of the support base (6). The cross-section of the opening groove (7) is arc-shaped.

2. The high-temperature resistant composite base plate according to claim 1, characterized in that: The thickness of the base plate (8) is set to 0.2mm-2mm, and the thickness of the polymer coating (9) is set to 0.1mm-1mm.

3. A battery, comprising a battery casing (1), a battery cell (3), and a cover plate (4), characterized in that: It also includes a high-temperature resistant composite base plate as described in any one of claims 1-2, wherein the battery cell (3) is disposed inside the battery casing (1), the cover plate (4) is disposed above the battery casing (1), and the composite base plate (2) is embedded between the battery cell (3) and the bottom of the battery casing (1).

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